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Botou Shuangxiang Environmental Protection Machinery Co., Ltd
Air skewed conveyor
NegotiableUpdate on 02/27
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Overview
Air chute is a pneumatic conveying equipment widely used for conveying dry powder materials, which is used for horizontal conveying of easily fluidized dry powder materials (such as cement and raw materials in cement enterprises).
Product Details
Product Introduction
1、 Overview: Air chute is a pneumatic conveying equipment widely used for conveying dry powder materials, which is used for horizontal conveying of easily fluidized dry powder materials (such as cement and raw materials in cement enterprises). It is composed of several grooves made of thin steel plates connected and arranged at a certain slope along its conveying direction. There is a breathable layer sandwiched between the upper and lower shells of the trough, which is a device that uses airflow to transport granular materials along the pipeline. There are three types: suction type, pressure type, and mixed type. The trough is powered by a high-pressure centrifugal fan (9-19; 9-26 type) to keep the material in the closed conveying trough in a fluidized state and flow slowly at the inclined end. The main body of the device has no transmission part and adopts a new type of coated wheel breathable layer, which makes sealing operation and management convenient. The device is light in weight, low in power consumption, has a large conveying force, and is easy to change the conveying direction. The conveying material is fed into the upper shell from the high-end, and compressed air is blown into the lower shell by a tone blower and passes through a dense porous breathable layer between the material particles to oxidize the material, changing the friction angle of the material to form a flowing state and sliding down along the slope to achieve the purpose of conveying. It is commonly used in the cement industry to transport cement and biomass with a moisture content of ≤ 1% and a temperature of ≤ 150 ℃. Air conveying inclined sludge is suitable for conveying easily fluidized powder materials such as alumina, coal powder, coal ash, alumina, gypsum powder, flour, cement, phosphate powder, etc. Air chutes are not suitable for materials with large particle size, high moisture content, and poor fluidization performance.
2、 Structural features:
The inclined groove is mainly composed of a feed inlet, standard groove, non-standard groove, shut-off valve (discharge valve), 3-90 ° bend groove, shut-off valve, three-way groove, four-way groove, sight glass window, blower, rain cover, discharge chute, feed chute, breathable layer, groove frame, etc.
The air chute conveyor is composed of several thin steel troughs connected and arranged at a certain slope along its conveying direction.
The inclined groove is composed of an upper groove and a lower groove, with a specially made wear-resistant synthetic fabric as a breathable layer in the middle to separate the upper and lower grooves. The tank is installed with a downward inclination of 4% to 6% along the conveying direction. The material is continuously fed onto the breathable layer of the inclined chute through the high-end discharge pipe, and air is sent into the lower chute by the ventilation fan. When air passes through the breathable layer and the material, the material becomes fluidized and flows downwards along the groove on the breathable layer under its own weight force, and is discharged from the discharge port. The air escaping from the material layer is discharged into the atmosphere through the filter layer at the top of the upper tank, or enters the dust removal equipment through the exhaust pipe. The inclined groove is installed at a certain slope. When low-pressure air enters the lower groove and passes through the breathable layer into the upper groove, the material in the upper groove becomes fluid and flows under the action of gravity to achieve the conveying purpose.
The breathable layer is the main component of the air chute, and the new breathable PETS-6 (polyester) type is a synthetic fiber fabric that has the advantages of high temperature resistance (up to 150), corrosion resistance, wear resistance, low moisture absorption, light weight, smooth surface, and long service life. This breathable layer has a lifespan that is doubled compared to the old-fashioned chute breathable layer. The function of the breathable layer is to:
1. The breathable layer is a device that supports materials, allowing air to evenly pass through and fluidized the materials.
2. The pores of the breathable layer should be dense, uniform, and continuous to ensure uniform material fluidization and avoid vortex phenomena.
3. The surface of the breathable layer should be flat, with certain moisture resistance, heat resistance, and mechanical strength.
4. Commonly used breathable layers include ceramic porous plates, cement porous plates, and fiber fabrics. Currently, synthetic fiber fabrics are commonly used to make breathable layers.
3、 Technical performance
1. Material conveying status: Dry powder or easily aerated powder particles with a particle size of 3-6mm or less, with a surface moisture content of about 0.8% allowed, otherwise it may cause blockage or even blockage.
2. Conveying capacity: The conveying capacity of inclined chutes is influenced by many factors and often varies greatly. Based on theoretical calculations and comprehensive analysis of actual usage, we provide relevant data in the cement industry recommendation table (see specifications and models table) for reference by users. When used in other industries, it can be selected based on the comparison of material density and fineness. It is worth noting that the inclined chute is different from other conveying machinery in that its conveying capacity is too low, often resulting in difficulties in conveying materials smoothly. On the contrary, increasing the height of the material layer appropriately can improve the uniformity of material gasification, but attention should be paid to maintaining the thickness of the material layer at about 1/4 to 1/3 of the height of the material channel (upper shell), and selecting the appropriate groove width according to productivity. Both thick and thin material layers can have adverse effects on transportation.
3. Conveyor slope: The layout of the inclined groove is inclined downwards along the direction of material transportation, with a slope generally ranging from 4% to 10%. A larger slope should be used as much as possible to improve conveying efficiency. When the surface moisture of the material is between 0.6% and 0.8%, it is recommended to choose a slope of 10%.
4. Gas consumption and air pressure: Based on the slope of the inclined groove and the shape characteristics of the material, the gas consumption ranges from 1.5 to 3m3The permeability layer can vary between 2 meters per square meter per minute3Consider the inlet air pressure per square meter of permeable layer per minute. The inlet pressure is 4000-6000Pa, and for large-sized long inclined slots, the larger value can generally be considered as 5000Pa.
4、 Specification and model
（1） Selection
1. Adhesive and adhesion properties. Viscous materials can stick or block the discharge hopper, feeder, and conveying pipeline. Therefore, the blowing type rotary blade feeder should be preferred in the rotary blade feeder.
2. Flammable and explosive. When transporting flammable and explosive materials such as plastics, chemicals, metal powders, and coal powder, measures such as explosion-proof valves and automatic fire extinguishing devices should be used.
3. Moisture content. If the amount of fine powder below 50 μ m in wet materials is less than 10%, most of them can be conveyed in traditional pneumatic conveying systems. If the moisture content in the wet material is high, the wet fine powder will adhere to the inner wall of the bent pipe, causing pipeline blockage, and the feeder should use a blowing type rotating blade feeder. If the material is not too damp, the problem of sticking can be alleviated by heating and conveying air.
4. Static electricity. The accumulation of material charges can cause adhesion and affect material fluidity, which can be solved by online humidification of air. In dense phase transportation, the cost of humidification is lower due to the use of less air.
5. Grinding and polishing properties. To reduce the wear of conveying pipelines and components, a lower conveying speed should be selected when conveying abrasive materials. In dilute phase systems, it is necessary to avoid using feeders with moving parts, and to extend the service life of the pipeline by using short radius bent pipes with R/D=2-3, a T-shaped cast iron pipe without one end, and ceramic steel composite pipes manufactured by self propagating high-temperature synthesis technology.
6. Fragility. During the transportation process, most material damage occurs in feeders such as bent pipes or screw pumps. Therefore, when designing the system, it is advisable to use fewer bends and avoid using feeders such as screw pumps that are prone to breakage and brittleness.
7. Granularity. The top discharge bin pump and ordinary rotating blade feeder are not suitable for conveying granular materials. The latter will cut off granular materials, while the offset rotating blade feeder can avoid this phenomenon.
8. Moisture absorption. Drying and conveying air can avoid the problems caused by hygroscopic materials. The use of freezing methods or desiccants can keep materials dry. Sometimes, if the moisture adsorption is not significant, the material can also be transported in a dense phase using undried air.
9. Low melting point. When low melting point high-speed particles? When the softening temperature reaches 150 ℃ and collides with the inner wall and bend of the pipeline, local melting may occur. For most low melting point materials, using low-speed conveying can eliminate this phenomenon.
10. Fineness. Micron or submicron sized fine powder will adhere to the inner wall of the pipeline during transportation, thereby reducing the cross-sectional area of the pipeline and decreasing the conveying volume. Usually, a silo pump is used and a flexible pipe that can be vibrated regularly is used in the pipeline to solve this problem.
11. Gas permeability and retention capacity. Dilute phase conveying is characterized by low pressure, high speed, and uniform distribution of materials across the cross-section of the conveying pipeline. Therefore, the conveying process is basically determined by the properties of individual particle materials that affect the surrounding airflow. The characteristics of dense phase transportation are high pressure, low speed, and strict separation of two-phase flow. The transported material mainly flows in the form of bundles at the bottom of the pipeline, occasionally with sand dunes, irregular clusters, or plug shaped flow filling the cross-section of the pipeline. This transportation process is influenced by the overall flow properties of the material rather than the characteristics of individual particle materials. Therefore, the gas permeability and retention capacity of materials have a significant impact on dense phase systems, while their impact on dilute phase systems is relatively small.
（2） Standard dimensions of air supply chute:
（3） Parameter calculation
1. The formula for calculating the conveying capacity of an air conveying chute is:
Q=0.98×3600S.v. ρ
In the formula: Q - conveying capacity, t/h；
S - cross-sectional area of the material (layer thickness is generally 50-80mm) ㎡;
V - material flow velocity, m/s (slope 4%, taken as 1.0 m/s); 5%; take 1.25 m/s; 6%； 1.5 m/s）
ρ - material bulk density, t／m3Inflatable cement: 0.75-1.05t/m3Inflatable cement raw material: 0.7-1 0t／m3Inflated coal powder: 0.4-0.6t/m3Inflatable fly ash 0.7-1.0: t/m3.)
2. The calculation formula for the air consumption of the air conveying chute is:
V=60BLa
In the formula: V - gas consumption, m3／h；
B - width of the inclined groove, mm；
L - length of inclined groove, mm；
A - Gas consumption per unit area, m3/㎡ permeable layer · min (usually 1.5~3 m)3/㎡ permeable layer · min).
3. Air pressure of air conveying chute:
The air pressure required for the air conveying chute fan should be greater than the sum of the resistance of the breathable layer and the resistance of the material layer. The wind pressure is generally 4000-6000Pa. When the specifications are large and the conveying distance is long, the higher value is taken, usually 5000Pa.
（4） Model number
1. Conveying material: Dry powdered material.
2. Slope: 6% straight inclined groove is not affected by flange structure, and the slope can be freely selected. The recommended slope for transporting recycled coarse materials is 10%. Generally speaking, when the arrangement and wear of the breathable layer allow, it is advantageous to use a large slope.
3. Conveying capacity: The conveying capacity of a chute is often affected by many factors and can vary greatly. Based on theoretical calculations and comprehensive analysis of domestic and foreign reference materials, as well as on-site investigations, we recommend the following values for reference when the slope is 6%.
4. Air pressure: 400-600 water columns (millimeters). Take the larger value for large specifications, long inclined slots, and other situations. Generally, it can be considered as 500 millimeters of water column.
5. Gas consumption: 1.5-3 cubic meters per minute per square meter of permeable layer. Various materials and their states, the condition of the breathable layer, and the slope of the inclined groove all have varying degrees of impact on air consumption. Generally, it can be considered as 2 (cubic meters per minute per square meter of permeable layer).
5、 Working principle
An air conveying chute is a device that uses airflow to transport granular materials along a pipeline. The fan blows air with a certain pressure through the breathable layer to make the material on the breathable layer fluidized. The material in the inclined chute slides down by its own gravity to achieve the conveying purpose. Usually used for close range transportation of dry powdered materials. Its working principle is to use the kinetic energy of the airflow to suspend the granular material and transport it along the pipeline with the airflow. Using a high-pressure centrifugal fan (9-19; 9-26) as the power source, the material in the closed conveying chute is kept in a fluidized state and flows slowly towards the inclined downward end. When conveying materials, the materials are fed into the upper shell from the high-end and compressed air is blown into the lower shell by the blower. Compressed air is distributed between material particles through a dense porous layer, causing the material to be fluidized. Due to the downward slope of the tank, the fluidized material slides forward along the tank under the action of gravity, achieving the purpose of transportation.
The permeable layer is made of PET5-6 material. The upper part of the breathable layer is the material chamber, and the lower part is the gas chamber. When gas with a certain pressure is blown into the gas chamber, the material is fluidized through the breathable layer, so the material flows like a fluid in the tank under the action of gravity. Usually, a centrifugal fan is used as the air source, and the excess air in the material chamber is extracted by the dust collector through the exhaust port of the inclined groove.
There are three types of air chute conveyors: suction type, pressure type, and mixed type.
1. Suction type. After the exhaust fan is started, the entire system maintains a certain degree of vacuum. Under the action of pressure difference, the air flow causes the material to enter the suction nozzle and be sent along the conveying pipe to the separator at the discharge point. The material is separated from the air flow and discharged from the bottom of the separator. The airflow is purified by the dust collector and then discharged into the atmosphere through the muffler. The advantage is that the feeding is simple and the material can be simultaneously extracted from several sources. But the conveying distance is short and the productivity is low. High sealing requirements.
2. Pressure delivery type. The blower presses air into the conveying pipe, and the material is supplied from the feeder. The mixture of air and material is conveyed along the conveying pipe to the discharge point. The material is discharged after passing through the separator, and the air is purified by the dust collector before being discharged into the atmosphere. The characteristics are opposite to the suction type, which can simultaneously transport materials to several places, with a longer conveying distance and higher productivity, but the structure is complex.
3. Mixed type. A combination of the two forms mentioned above. It should be noted that this device is not suitable for materials with large particle size, high moisture content, and poor fluidization.
The structure of the air chute is simple, compact, with low investment, energy consumption, and operating costs. It operates reliably, requires minimal maintenance, is easy to change the conveying direction, can feed at multiple points, and operates automatically without relying on expensive control devices. Its conveying capacity can reach hundreds of tons per hour or more, making it a fast, efficient, and cost-effective conveying method.
Due to the need for a certain drop to form a slope for inclined conveying, the slope should not be less than 8% when conveying fly ash. Therefore, the layout of the inclined chute system requires a certain spatial height, suitable for close range conveying, with a conveying distance usually within 100 meters. In power plant ash removal systems, it is commonly used for centralized and short distance horizontal separation of fly ash.
The air chute conveying system usually consists of a feeding device (impeller feeder that can evenly feed), a feeding chute, standard or non-standard straight grooves, end cover plates, and 90. Composed of curved groove, three-way groove, discharge chute, fan, etc., it can be designed and arranged according to the requirements of the conveying process. The design of the inclined groove system is the key to the success or failure of inclined groove operation, and requires a certain level of technology and experience. At present, there are eight specifications of inclined slot system equipment with slot widths of 125, 150, 170, 200, 250, 300, 350, and 400mm produced domestically. The output can reach 250 tons per hour, which can meet the ash conveying requirements of 600MW thermal power units. For smaller or larger series of inclined slots, they can be designed according to requirements.
An air chute is a rectangular cross-section conveying pipeline arranged at a certain slope, which allows the powder to flow under the action of gravity. The air chute is divided into upper and lower compartments. In order to reduce the frictional resistance during the movement of the powder, air of constant pressure and air volume is sent from the upper end of the inclined groove to the lower groove body. Air flows uniformly into the upper tank through the porous plate (also known as the gasification plate) between the upper and lower tanks, and then exits from the top of the inclined groove through the powder layer of the upper tank. When air passes through the porous plate, the powder and dust layer become fluidized, greatly improving the flowability of the powder and achieving the purpose of gravity transportation. From this, it can be seen that the airflow inside the air chute does not generate thrust to move the powder, but only acts as a fluidization effect to reduce the friction between the powder and the chute body, as well as between the particles of the powder itself. The force that drives the powder forward is its own gravity. Therefore, fundamentally speaking, an air chute is not a pneumatic conveying device, but a gravity conveying device under gasification. It is precisely because of this that the inherent deficiency of air chutes is determined, that is, they can only be inclined downwards at a certain angle and cannot be supplemented upwards or horizontally. Due to different physical properties, the inclination of the inclined groove varies for different powders. Generally, the inclination is 4% -6%; When used in power plants.
1. Generally, the installation of linear conveying should tilt the inlet and outlet downwards at an angle of 6-10 degrees, and ensure reliable sealing at the upper and lower tank bodies and the joints of each tank (padding can be added);
2. A 90 degree turn (divided into left and right) is required for turning;
3. Use three-way or four-way slots for bifurcation and load the air valve after bifurcation. To control the flow direction of fluidized materials and ensure that the materials are "allowed to use air", the shutdown section can reduce the consumption of air volume;
4. Add a fan to the side of the lower trough after the conveyor line is too long or splits;
The formula for calculating the air consumption of an air chute is as follows:
V=60×α×(B/1000)×L
In the formula, V - gas consumption m ³/h
The air consumption per unit area of the breathable layer is generally 2.0-3m3/㎡ min;
B - width of inclined groove mm;
L - length of inclined groove m.
5. The exhaust of this chute is carried out on the discharge chute, and after passing through the exhaust duct, it should enter the small bag dust removal port with an air volume of 1.5 times the required air volume. The pressure of the upper chute at the exhaust outlet should be maintained at around 0.
（2） Manufacturing and installation of brackets
1. Manufacturing of brackets
The bracket for the air conveying chute is generally made of 100 channel steel, which is made into an H-shape. The horizontal channel steel at the upper end is 100mm away from the top of the vertical channel steel, and the height should be 100mm higher than the bottom of the chute. The width is 610mm, and a 200mm * 200mm anchor screw plate with a thickness of 10mm is welded at the bottom, and anchor screw holes are drilled.
2. Installation of bracket
After the brackets are completed, they should be evenly arranged under the main channel of the inclined groove, with a distance of 2m each, and fixed with anchor wires.
（3） Installation of the main gate
Before installing the inclined groove, the main gate should be installed on the old inclined groove and sealed with a gasket.
（4） Installation of the main inclined channel
1. Installation of the lower slot
Before installing the inclined groove, first open the inclined groove and install the lower groove on the bracket in numerical order. When installing the flange, be sure to add wool felt pads and evenly coat the two mating flanges with white latex. Heat the screw hole with an iron rod slightly smaller than the diameter of the mounting bolt, and drill holes around the flange where necessary. Be careful not to let open flames burn the felt during perforation
2. Installation of breathable layer
1) Cut the breathable layer according to the required size, and use an electric iron (or heated steel bar) to heat and seal the cut area;
2) Drill holes, heat with an iron rod slightly smaller than the diameter of the installation bolt, and punch holes in the areas around the breathable layer that need to be perforated. Be careful not to let open flames burn out the breathable layer during perforation. If a drilling rig is used to drill holes, a hot iron rod should be used to iron and seal the area around the hole after drilling;
3) Lay the breathable layer flat on the lower groove, pass it through the bolt, add iron bars around it for compression, and tighten the screw cap to use it;
4) The pressure strip (or flange) should be deburred and the welding area should be ground flat; To ensure sealing, white latex should be applied around the lower surface of the breathable layer;
3. Installation of the upper slot
After the installation of the breathable layer is completed, cover the groove. Be sure to apply white latex around the upper groove screw hole, and add wool felt to the flange and apply white latex. After the docking is completed, apply waterproof sealant evenly around the flange.
The air conveying chute must be fed evenly to avoid blockage caused by excessive instantaneous feeding! Normal configuration situation. A constant speed feeder and an access door should be installed above the inclined chute, not just the access door.
（5） Installation of gate motor
1. The gate motor is an electric push rod, which is the power device of the discharge actuator.
2. Before installing the three (four) channels, it is necessary to first install the electric push rod and adjust the stroke limit device of the push rod to enable the gate to open or close.
3. Installation of motor: First, remove the two motor shaft seats installed on the motor seat and install them on the motor shaft. Then, parallel the motor to the motor seat and secure the bolts.
（6） Installation of fan
Install the fan on the pre made bracket, and the height of the bracket should be such that the distance between the fan outlet and the inclined groove inlet is not more than one meter. Connect the fan outlet to the inclined groove inlet with a rubber hose.
（7） Installation of exhaust vents
The inclined groove exhaust outlet is used to exhaust air from the trough body of the discharge chute. After passing through the exhaust duct, it should enter the small bag dust removal outlet with an air volume of 1.5 times the required air volume. The pressure of the trough at the exhaust outlet should be maintained at around 0.
7、 Usage and Maintenance
The high-end material is fed into the upper shell, and compressed air is blown into the lower shell by a specially designed blower, and distributed between the material particles through a dense porous breathable layer, causing the material to undergo so-called gasification to change the friction angle of the material, forming a flow state and sliding down along the slope to achieve the conveying purpose.
1. When starting up, first turn on the fan, then open the feeding bin gate, and then open the main gate for feeding. When shutting down, first close the main gate to stop feeding. After the feeding is completed, stop the fan and close the bin gate. When the fan at the fork and the fan at the lower end of the material channel are not in use, stop the machine.
2. The conveying trough should be kept sealed, and any air or powder leakage should be repaired;
3. When replacing the polyester breathable layer, the breathable layer should be cut according to the required size, and the cut should be heated and sealed with an electric iron (or heated steel bar) to prevent diffusion;
4. Drill holes, heat with an iron rod slightly smaller than the diameter of the installation bolt, and punch holes in the areas around the breathable layer that need to be perforated. Be careful not to let open flames burn out the breathable layer during perforation. If a drilling rig is used to drill holes, a hot iron rod should be used to iron and seal the area around the hole;
5. Lay the breathable layer flat on the punching box, thread it through the bolts, add iron bars around it for compression, and tighten the screw cap to use it;
6. The pressure strip (or flange) should be deburred and the welding area should be ground dry;
7. To ensure sealing, polymer sealant (or a 10mm thick felt pad) can be applied around the lower surface of the breathable layer.
Suitable for conveying easily flowable powder materials such as alumina, coal powder, coal ash, alumina, gypsum powder, flour, cement, phosphate powder, etc.
8、 Precautions for startup and parking
1. Feed evenly and promptly remove impurities deposited in the permeable layer.
2. When driving, turn on the fan first, and stop feeding when parking. When parking for a long time, the material on the breathable layer should be removed completely.
3. It is important to ensure that the inclined chute inhales dry and clean air as much as possible to ensure long-term operation of the inclined chute. The air inlet filter of the fan should be cleaned in a timely manner.
4. Regularly pay attention to whether the gate of the three-way groove and four-way groove is tightly closed.
5. After using the newly installed chute for a period of time, it should be thoroughly inspected.
6. If the breathable layer at the feed inlet is severely worn or there is poor feeding, the position and size of the feed chute should be adjusted appropriately.
7. After using the breathable layer for a period of time, if it becomes too loose, it should be tightened again. If there is any damage, it can be repaired or replaced locally.
8. In the use of inclined chutes, if for some reason the breathable layer is too concave and affects the normal transportation of materials, a layer of steel wire mesh with a diameter of Φ 1mm × 10mm × 10mm can be placed under the breathable layer. Pay attention to the sealing of the upper and lower shell flanges at this time.
9. The appropriate breathable layer material and good usage condition are of great significance for the long-term rotation of the inclined groove.
There are various materials that can be used as breathable layers, such as some chemical fiber products that are strong and wear-resistant, and glass fiber fabrics that are smooth and temperature resistant, each with its own characteristics. Choosing the appropriate material is necessary.
10. Pay attention to maintaining the exhaust and dust collection device of the inclined chute to facilitate the smooth discharge of air for gasification materials. Otherwise, if the pressure in the upper chute increases, the conveying capacity will sharply decrease or even the entire inclined chute will be blocked.
11. In order to operate and maintain the inclined groove scientifically, in addition to regularly maintaining the good condition of the sight glass window, users can set U-shaped pressure gauges on the upper and lower shells of the inclined groove head and tail (also added in the middle of the inclined groove beyond 50 meters) according to their specific situation (see Figure 13), so as to timely and accurately grasp the wind pressure inside the inclined groove; The change in material surface can prevent the occurrence of blockage accidents in advance.
12. When the following situations occur, attention should be paid to strengthening the management of inclined slots:
(1) Convey materials that have not been loosened, materials that have absorbed moisture, materials that have clumped and contained slag, pure clinker cement, special cement, and other materials that are not easy to flow.
(2) The permeable layer of materials such as conveying ground cement and before being selected into the powder machine is prone to wear and tear.
13. After the inclined chute is operated normally, it should gradually explore the use of fan controlled air valves to reduce power consumption and the burden on exhaust devices.
9、 Daily inspection
1. Pre operation inspection
(1) Check for any looseness or detachment of the fastening bolts.
(2) Whether the sealing condition is good at all places.
2. Inspection during operation
(1) Is there any air leakage or ash leakage.
(2) Check for loose bolts and observe if the glass window material feeding is normal.
3. Shutdown inspection
(1) Tighten all loose bolts.
(2) Damage to the breathable layer canvas.
(3) Remove dust accumulation inside the air chamber.
(4) The accumulated dust at each discharge port must be cleaned to prevent long-term material accumulation from becoming damp and clumping, which may cause blockage when the discharge port is operated again.
10、 Main advantages
Due to the lack of transmission components in conveying materials, the air chute is easy to seal and manage. The new coating breathable layer used has the characteristics of corrosion resistance, wear resistance, low moisture absorption, light weight, and smooth surface; The whole machine has the following advantages:
1. No running parts, minimal wear, easy maintenance, material saving, no noise, good sealing
2. Simple construction, light weight, reliable operation, and high delivery capacity,
3. Easy to change the conveying direction, and can also feed and unload at multiple points.
4. Easy to operate and reliable in work.
5. Low air pressure, low power consumption, and low power consumption.
11、 Main drawbacks:
1. Only suitable for conveying flowable and dry powdered materials.
2. The conveying distance is short, generally not exceeding 100 meters
3. Requires a high installation space and cannot be transported upwards, limiting its range of use.
12、 The difference between air conveying chute and material sealing pump
1. Air conveying chutes are commonly used to transport dry powder materials, also known as air chutes. Like material sealing pumps, air conveying chutes are sealed, low-pressure conveying equipment. The difference between the two is that material sealing pumps can be used for vertical conveying, while air conveying chutes can only be used for horizontal conveying, with a general slope requirement of 3-6 °.
2. The material sealing pump belongs to the pump internal transportation, while the air conveying chute is transported in the chute. Compared with the two, each has its own advantages.
3. Due to the large space of the air conveying chute, the conveying capacity is large and the output is high. The material sealing pump can meet the needs of various sites due to its design for multiple types of conveying.
4. There is also a significant difference in appearance between the two.
2、 Structural features:
The inclined groove is mainly composed of a feed inlet, standard groove, non-standard groove, shut-off valve (discharge valve), 3-90 ° bend groove, shut-off valve, three-way groove, four-way groove, sight glass window, blower, rain cover, discharge chute, feed chute, breathable layer, groove frame, etc.
The air chute conveyor is composed of several thin steel troughs connected and arranged at a certain slope along its conveying direction.
The inclined groove is composed of an upper groove and a lower groove, with a specially made wear-resistant synthetic fabric as a breathable layer in the middle to separate the upper and lower grooves. The tank is installed with a downward inclination of 4% to 6% along the conveying direction. The material is continuously fed onto the breathable layer of the inclined chute through the high-end discharge pipe, and air is sent into the lower chute by the ventilation fan. When air passes through the breathable layer and the material, the material becomes fluidized and flows downwards along the groove on the breathable layer under its own weight force, and is discharged from the discharge port. The air escaping from the material layer is discharged into the atmosphere through the filter layer at the top of the upper tank, or enters the dust removal equipment through the exhaust pipe. The inclined groove is installed at a certain slope. When low-pressure air enters the lower groove and passes through the breathable layer into the upper groove, the material in the upper groove becomes fluid and flows under the action of gravity to achieve the conveying purpose.
The breathable layer is the main component of the air chute, and the new breathable PETS-6 (polyester) type is a synthetic fiber fabric that has the advantages of high temperature resistance (up to 150), corrosion resistance, wear resistance, low moisture absorption, light weight, smooth surface, and long service life. This breathable layer has a lifespan that is doubled compared to the old-fashioned chute breathable layer. The function of the breathable layer is to:
1. The breathable layer is a device that supports materials, allowing air to evenly pass through and fluidized the materials.
2. The pores of the breathable layer should be dense, uniform, and continuous to ensure uniform material fluidization and avoid vortex phenomena.
3. The surface of the breathable layer should be flat, with certain moisture resistance, heat resistance, and mechanical strength.
4. Commonly used breathable layers include ceramic porous plates, cement porous plates, and fiber fabrics. Currently, synthetic fiber fabrics are commonly used to make breathable layers.
3、 Technical performance
1. Material conveying status: Dry powder or easily aerated powder particles with a particle size of 3-6mm or less, with a surface moisture content of about 0.8% allowed, otherwise it may cause blockage or even blockage.
2. Conveying capacity: The conveying capacity of inclined chutes is influenced by many factors and often varies greatly. Based on theoretical calculations and comprehensive analysis of actual usage, we provide relevant data in the cement industry recommendation table (see specifications and models table) for reference by users. When used in other industries, it can be selected based on the comparison of material density and fineness. It is worth noting that the inclined chute is different from other conveying machinery in that its conveying capacity is too low, often resulting in difficulties in conveying materials smoothly. On the contrary, increasing the height of the material layer appropriately can improve the uniformity of material gasification, but attention should be paid to maintaining the thickness of the material layer at about 1/4 to 1/3 of the height of the material channel (upper shell), and selecting the appropriate groove width according to productivity. Both thick and thin material layers can have adverse effects on transportation.
3. Conveyor slope: The layout of the inclined groove is inclined downwards along the direction of material transportation, with a slope generally ranging from 4% to 10%. A larger slope should be used as much as possible to improve conveying efficiency. When the surface moisture of the material is between 0.6% and 0.8%, it is recommended to choose a slope of 10%.
4. Gas consumption and air pressure: Based on the slope of the inclined groove and the shape characteristics of the material, the gas consumption ranges from 1.5 to 3m3The permeability layer can vary between 2 meters per square meter per minute3Consider the inlet air pressure per square meter of permeable layer per minute. The inlet pressure is 4000-6000Pa, and for large-sized long inclined slots, the larger value can generally be considered as 5000Pa.
4、 Specification and model
（1） Selection
1. Adhesive and adhesion properties. Viscous materials can stick or block the discharge hopper, feeder, and conveying pipeline. Therefore, the blowing type rotary blade feeder should be preferred in the rotary blade feeder.
2. Flammable and explosive. When transporting flammable and explosive materials such as plastics, chemicals, metal powders, and coal powder, measures such as explosion-proof valves and automatic fire extinguishing devices should be used.
3. Moisture content. If the amount of fine powder below 50 μ m in wet materials is less than 10%, most of them can be conveyed in traditional pneumatic conveying systems. If the moisture content in the wet material is high, the wet fine powder will adhere to the inner wall of the bent pipe, causing pipeline blockage, and the feeder should use a blowing type rotating blade feeder. If the material is not too damp, the problem of sticking can be alleviated by heating and conveying air.
4. Static electricity. The accumulation of material charges can cause adhesion and affect material fluidity, which can be solved by online humidification of air. In dense phase transportation, the cost of humidification is lower due to the use of less air.
5. Grinding and polishing properties. To reduce the wear of conveying pipelines and components, a lower conveying speed should be selected when conveying abrasive materials. In dilute phase systems, it is necessary to avoid using feeders with moving parts, and to extend the service life of the pipeline by using short radius bent pipes with R/D=2-3, a T-shaped cast iron pipe without one end, and ceramic steel composite pipes manufactured by self propagating high-temperature synthesis technology.
6. Fragility. During the transportation process, most material damage occurs in feeders such as bent pipes or screw pumps. Therefore, when designing the system, it is advisable to use fewer bends and avoid using feeders such as screw pumps that are prone to breakage and brittleness.
7. Granularity. The top discharge bin pump and ordinary rotating blade feeder are not suitable for conveying granular materials. The latter will cut off granular materials, while the offset rotating blade feeder can avoid this phenomenon.
8. Moisture absorption. Drying and conveying air can avoid the problems caused by hygroscopic materials. The use of freezing methods or desiccants can keep materials dry. Sometimes, if the moisture adsorption is not significant, the material can also be transported in a dense phase using undried air.
9. Low melting point. When low melting point high-speed particles? When the softening temperature reaches 150 ℃ and collides with the inner wall and bend of the pipeline, local melting may occur. For most low melting point materials, using low-speed conveying can eliminate this phenomenon.
10. Fineness. Micron or submicron sized fine powder will adhere to the inner wall of the pipeline during transportation, thereby reducing the cross-sectional area of the pipeline and decreasing the conveying volume. Usually, a silo pump is used and a flexible pipe that can be vibrated regularly is used in the pipeline to solve this problem.
11. Gas permeability and retention capacity. Dilute phase conveying is characterized by low pressure, high speed, and uniform distribution of materials across the cross-section of the conveying pipeline. Therefore, the conveying process is basically determined by the properties of individual particle materials that affect the surrounding airflow. The characteristics of dense phase transportation are high pressure, low speed, and strict separation of two-phase flow. The transported material mainly flows in the form of bundles at the bottom of the pipeline, occasionally with sand dunes, irregular clusters, or plug shaped flow filling the cross-section of the pipeline. This transportation process is influenced by the overall flow properties of the material rather than the characteristics of individual particle materials. Therefore, the gas permeability and retention capacity of materials have a significant impact on dense phase systems, while their impact on dilute phase systems is relatively small.
（2） Standard dimensions of air supply chute:
（3） Parameter calculation
1. The formula for calculating the conveying capacity of an air conveying chute is:
Q=0.98×3600S.v. ρ
In the formula: Q - conveying capacity, t/h；
S - cross-sectional area of the material (layer thickness is generally 50-80mm) ㎡;
V - material flow velocity, m/s (slope 4%, taken as 1.0 m/s); 5%; take 1.25 m/s; 6%； 1.5 m/s）
ρ - material bulk density, t／m3Inflatable cement: 0.75-1.05t/m3Inflatable cement raw material: 0.7-1 0t／m3Inflated coal powder: 0.4-0.6t/m3Inflatable fly ash 0.7-1.0: t/m3.)
2. The calculation formula for the air consumption of the air conveying chute is:
V=60BLa
In the formula: V - gas consumption, m3／h；
B - width of the inclined groove, mm；
L - length of inclined groove, mm；
A - Gas consumption per unit area, m3/㎡ permeable layer · min (usually 1.5~3 m)3/㎡ permeable layer · min).
3. Air pressure of air conveying chute:
The air pressure required for the air conveying chute fan should be greater than the sum of the resistance of the breathable layer and the resistance of the material layer. The wind pressure is generally 4000-6000Pa. When the specifications are large and the conveying distance is long, the higher value is taken, usually 5000Pa.
（4） Model number
1. Conveying material: Dry powdered material.
2. Slope: 6% straight inclined groove is not affected by flange structure, and the slope can be freely selected. The recommended slope for transporting recycled coarse materials is 10%. Generally speaking, when the arrangement and wear of the breathable layer allow, it is advantageous to use a large slope.
3. Conveying capacity: The conveying capacity of a chute is often affected by many factors and can vary greatly. Based on theoretical calculations and comprehensive analysis of domestic and foreign reference materials, as well as on-site investigations, we recommend the following values for reference when the slope is 6%.
| Slant width (mm) | Conveying capacity (m)3/h） |
| 250 | ～30 |
| 315 | ～60 |
| 400 | ～120 |
| 500 | ～200 |
| model | model | model | 200 | 250 | 315 | 400 | 500 |
| Tank width | Tank width | material | 200 | 250 | 315 | 400 | 500 |
| Yield (T/H) | 8º | cement | 22 | 40 | 70 | 130 | 220 |
| Yield (T/H) | 8º | raw material | 16 | 30 | 55 | 100 | 165 |
| Yield (T/H) | 10º | cement | 40 | 65 | 120 | 250 | 400 |
| Yield (T/H) | 10º | raw material | 30 | 55 | 90 | 185 | 300 |
| Wind pressure KPa | Wind pressure KPa | Wind pressure KPa | 2—3 | 2—3 | 2—3 | 2—3 | 2—3 |
| Air volume m3/㎡.min | Air volume m3/㎡.min | Air volume m3/㎡.min | 1.5-2 | 1.5-2 | 1.5-2 | 1.5-2 | 1.5-2 |
5、 Working principle
An air conveying chute is a device that uses airflow to transport granular materials along a pipeline. The fan blows air with a certain pressure through the breathable layer to make the material on the breathable layer fluidized. The material in the inclined chute slides down by its own gravity to achieve the conveying purpose. Usually used for close range transportation of dry powdered materials. Its working principle is to use the kinetic energy of the airflow to suspend the granular material and transport it along the pipeline with the airflow. Using a high-pressure centrifugal fan (9-19; 9-26) as the power source, the material in the closed conveying chute is kept in a fluidized state and flows slowly towards the inclined downward end. When conveying materials, the materials are fed into the upper shell from the high-end and compressed air is blown into the lower shell by the blower. Compressed air is distributed between material particles through a dense porous layer, causing the material to be fluidized. Due to the downward slope of the tank, the fluidized material slides forward along the tank under the action of gravity, achieving the purpose of transportation.
The permeable layer is made of PET5-6 material. The upper part of the breathable layer is the material chamber, and the lower part is the gas chamber. When gas with a certain pressure is blown into the gas chamber, the material is fluidized through the breathable layer, so the material flows like a fluid in the tank under the action of gravity. Usually, a centrifugal fan is used as the air source, and the excess air in the material chamber is extracted by the dust collector through the exhaust port of the inclined groove.
There are three types of air chute conveyors: suction type, pressure type, and mixed type.
1. Suction type. After the exhaust fan is started, the entire system maintains a certain degree of vacuum. Under the action of pressure difference, the air flow causes the material to enter the suction nozzle and be sent along the conveying pipe to the separator at the discharge point. The material is separated from the air flow and discharged from the bottom of the separator. The airflow is purified by the dust collector and then discharged into the atmosphere through the muffler. The advantage is that the feeding is simple and the material can be simultaneously extracted from several sources. But the conveying distance is short and the productivity is low. High sealing requirements.
2. Pressure delivery type. The blower presses air into the conveying pipe, and the material is supplied from the feeder. The mixture of air and material is conveyed along the conveying pipe to the discharge point. The material is discharged after passing through the separator, and the air is purified by the dust collector before being discharged into the atmosphere. The characteristics are opposite to the suction type, which can simultaneously transport materials to several places, with a longer conveying distance and higher productivity, but the structure is complex.
3. Mixed type. A combination of the two forms mentioned above. It should be noted that this device is not suitable for materials with large particle size, high moisture content, and poor fluidization.
The structure of the air chute is simple, compact, with low investment, energy consumption, and operating costs. It operates reliably, requires minimal maintenance, is easy to change the conveying direction, can feed at multiple points, and operates automatically without relying on expensive control devices. Its conveying capacity can reach hundreds of tons per hour or more, making it a fast, efficient, and cost-effective conveying method.
Due to the need for a certain drop to form a slope for inclined conveying, the slope should not be less than 8% when conveying fly ash. Therefore, the layout of the inclined chute system requires a certain spatial height, suitable for close range conveying, with a conveying distance usually within 100 meters. In power plant ash removal systems, it is commonly used for centralized and short distance horizontal separation of fly ash.
The air chute conveying system usually consists of a feeding device (impeller feeder that can evenly feed), a feeding chute, standard or non-standard straight grooves, end cover plates, and 90. Composed of curved groove, three-way groove, discharge chute, fan, etc., it can be designed and arranged according to the requirements of the conveying process. The design of the inclined groove system is the key to the success or failure of inclined groove operation, and requires a certain level of technology and experience. At present, there are eight specifications of inclined slot system equipment with slot widths of 125, 150, 170, 200, 250, 300, 350, and 400mm produced domestically. The output can reach 250 tons per hour, which can meet the ash conveying requirements of 600MW thermal power units. For smaller or larger series of inclined slots, they can be designed according to requirements.
An air chute is a rectangular cross-section conveying pipeline arranged at a certain slope, which allows the powder to flow under the action of gravity. The air chute is divided into upper and lower compartments. In order to reduce the frictional resistance during the movement of the powder, air of constant pressure and air volume is sent from the upper end of the inclined groove to the lower groove body. Air flows uniformly into the upper tank through the porous plate (also known as the gasification plate) between the upper and lower tanks, and then exits from the top of the inclined groove through the powder layer of the upper tank. When air passes through the porous plate, the powder and dust layer become fluidized, greatly improving the flowability of the powder and achieving the purpose of gravity transportation. From this, it can be seen that the airflow inside the air chute does not generate thrust to move the powder, but only acts as a fluidization effect to reduce the friction between the powder and the chute body, as well as between the particles of the powder itself. The force that drives the powder forward is its own gravity. Therefore, fundamentally speaking, an air chute is not a pneumatic conveying device, but a gravity conveying device under gasification. It is precisely because of this that the inherent deficiency of air chutes is determined, that is, they can only be inclined downwards at a certain angle and cannot be supplemented upwards or horizontally. Due to different physical properties, the inclination of the inclined groove varies for different powders. Generally, the inclination is 4% -6%; When used in power plants.
6、 Installation and debugging:
（1） General principle of installation:1. Generally, the installation of linear conveying should tilt the inlet and outlet downwards at an angle of 6-10 degrees, and ensure reliable sealing at the upper and lower tank bodies and the joints of each tank (padding can be added);
2. A 90 degree turn (divided into left and right) is required for turning;
3. Use three-way or four-way slots for bifurcation and load the air valve after bifurcation. To control the flow direction of fluidized materials and ensure that the materials are "allowed to use air", the shutdown section can reduce the consumption of air volume;
4. Add a fan to the side of the lower trough after the conveyor line is too long or splits;
The formula for calculating the air consumption of an air chute is as follows:
V=60×α×(B/1000)×L
In the formula, V - gas consumption m ³/h
The air consumption per unit area of the breathable layer is generally 2.0-3m3/㎡ min;
B - width of inclined groove mm;
L - length of inclined groove m.
5. The exhaust of this chute is carried out on the discharge chute, and after passing through the exhaust duct, it should enter the small bag dust removal port with an air volume of 1.5 times the required air volume. The pressure of the upper chute at the exhaust outlet should be maintained at around 0.
（2） Manufacturing and installation of brackets
1. Manufacturing of brackets
The bracket for the air conveying chute is generally made of 100 channel steel, which is made into an H-shape. The horizontal channel steel at the upper end is 100mm away from the top of the vertical channel steel, and the height should be 100mm higher than the bottom of the chute. The width is 610mm, and a 200mm * 200mm anchor screw plate with a thickness of 10mm is welded at the bottom, and anchor screw holes are drilled.
2. Installation of bracket
After the brackets are completed, they should be evenly arranged under the main channel of the inclined groove, with a distance of 2m each, and fixed with anchor wires.
（3） Installation of the main gate
Before installing the inclined groove, the main gate should be installed on the old inclined groove and sealed with a gasket.
（4） Installation of the main inclined channel
1. Installation of the lower slot
Before installing the inclined groove, first open the inclined groove and install the lower groove on the bracket in numerical order. When installing the flange, be sure to add wool felt pads and evenly coat the two mating flanges with white latex. Heat the screw hole with an iron rod slightly smaller than the diameter of the mounting bolt, and drill holes around the flange where necessary. Be careful not to let open flames burn the felt during perforation
2. Installation of breathable layer
1) Cut the breathable layer according to the required size, and use an electric iron (or heated steel bar) to heat and seal the cut area;
2) Drill holes, heat with an iron rod slightly smaller than the diameter of the installation bolt, and punch holes in the areas around the breathable layer that need to be perforated. Be careful not to let open flames burn out the breathable layer during perforation. If a drilling rig is used to drill holes, a hot iron rod should be used to iron and seal the area around the hole after drilling;
3) Lay the breathable layer flat on the lower groove, pass it through the bolt, add iron bars around it for compression, and tighten the screw cap to use it;
4) The pressure strip (or flange) should be deburred and the welding area should be ground flat; To ensure sealing, white latex should be applied around the lower surface of the breathable layer;
3. Installation of the upper slot
After the installation of the breathable layer is completed, cover the groove. Be sure to apply white latex around the upper groove screw hole, and add wool felt to the flange and apply white latex. After the docking is completed, apply waterproof sealant evenly around the flange.
The air conveying chute must be fed evenly to avoid blockage caused by excessive instantaneous feeding! Normal configuration situation. A constant speed feeder and an access door should be installed above the inclined chute, not just the access door.
（5） Installation of gate motor
1. The gate motor is an electric push rod, which is the power device of the discharge actuator.
2. Before installing the three (four) channels, it is necessary to first install the electric push rod and adjust the stroke limit device of the push rod to enable the gate to open or close.
3. Installation of motor: First, remove the two motor shaft seats installed on the motor seat and install them on the motor shaft. Then, parallel the motor to the motor seat and secure the bolts.
（6） Installation of fan
Install the fan on the pre made bracket, and the height of the bracket should be such that the distance between the fan outlet and the inclined groove inlet is not more than one meter. Connect the fan outlet to the inclined groove inlet with a rubber hose.
（7） Installation of exhaust vents
The inclined groove exhaust outlet is used to exhaust air from the trough body of the discharge chute. After passing through the exhaust duct, it should enter the small bag dust removal outlet with an air volume of 1.5 times the required air volume. The pressure of the trough at the exhaust outlet should be maintained at around 0.
7、 Usage and Maintenance
The high-end material is fed into the upper shell, and compressed air is blown into the lower shell by a specially designed blower, and distributed between the material particles through a dense porous breathable layer, causing the material to undergo so-called gasification to change the friction angle of the material, forming a flow state and sliding down along the slope to achieve the conveying purpose.
1. When starting up, first turn on the fan, then open the feeding bin gate, and then open the main gate for feeding. When shutting down, first close the main gate to stop feeding. After the feeding is completed, stop the fan and close the bin gate. When the fan at the fork and the fan at the lower end of the material channel are not in use, stop the machine.
2. The conveying trough should be kept sealed, and any air or powder leakage should be repaired;
3. When replacing the polyester breathable layer, the breathable layer should be cut according to the required size, and the cut should be heated and sealed with an electric iron (or heated steel bar) to prevent diffusion;
4. Drill holes, heat with an iron rod slightly smaller than the diameter of the installation bolt, and punch holes in the areas around the breathable layer that need to be perforated. Be careful not to let open flames burn out the breathable layer during perforation. If a drilling rig is used to drill holes, a hot iron rod should be used to iron and seal the area around the hole;
5. Lay the breathable layer flat on the punching box, thread it through the bolts, add iron bars around it for compression, and tighten the screw cap to use it;
6. The pressure strip (or flange) should be deburred and the welding area should be ground dry;
7. To ensure sealing, polymer sealant (or a 10mm thick felt pad) can be applied around the lower surface of the breathable layer.
Suitable for conveying easily flowable powder materials such as alumina, coal powder, coal ash, alumina, gypsum powder, flour, cement, phosphate powder, etc.
8、 Precautions for startup and parking
1. Feed evenly and promptly remove impurities deposited in the permeable layer.
2. When driving, turn on the fan first, and stop feeding when parking. When parking for a long time, the material on the breathable layer should be removed completely.
3. It is important to ensure that the inclined chute inhales dry and clean air as much as possible to ensure long-term operation of the inclined chute. The air inlet filter of the fan should be cleaned in a timely manner.
4. Regularly pay attention to whether the gate of the three-way groove and four-way groove is tightly closed.
5. After using the newly installed chute for a period of time, it should be thoroughly inspected.
6. If the breathable layer at the feed inlet is severely worn or there is poor feeding, the position and size of the feed chute should be adjusted appropriately.
7. After using the breathable layer for a period of time, if it becomes too loose, it should be tightened again. If there is any damage, it can be repaired or replaced locally.
8. In the use of inclined chutes, if for some reason the breathable layer is too concave and affects the normal transportation of materials, a layer of steel wire mesh with a diameter of Φ 1mm × 10mm × 10mm can be placed under the breathable layer. Pay attention to the sealing of the upper and lower shell flanges at this time.
9. The appropriate breathable layer material and good usage condition are of great significance for the long-term rotation of the inclined groove.
There are various materials that can be used as breathable layers, such as some chemical fiber products that are strong and wear-resistant, and glass fiber fabrics that are smooth and temperature resistant, each with its own characteristics. Choosing the appropriate material is necessary.
10. Pay attention to maintaining the exhaust and dust collection device of the inclined chute to facilitate the smooth discharge of air for gasification materials. Otherwise, if the pressure in the upper chute increases, the conveying capacity will sharply decrease or even the entire inclined chute will be blocked.
11. In order to operate and maintain the inclined groove scientifically, in addition to regularly maintaining the good condition of the sight glass window, users can set U-shaped pressure gauges on the upper and lower shells of the inclined groove head and tail (also added in the middle of the inclined groove beyond 50 meters) according to their specific situation (see Figure 13), so as to timely and accurately grasp the wind pressure inside the inclined groove; The change in material surface can prevent the occurrence of blockage accidents in advance.
12. When the following situations occur, attention should be paid to strengthening the management of inclined slots:
(1) Convey materials that have not been loosened, materials that have absorbed moisture, materials that have clumped and contained slag, pure clinker cement, special cement, and other materials that are not easy to flow.
(2) The permeable layer of materials such as conveying ground cement and before being selected into the powder machine is prone to wear and tear.
13. After the inclined chute is operated normally, it should gradually explore the use of fan controlled air valves to reduce power consumption and the burden on exhaust devices.
9、 Daily inspection
1. Pre operation inspection
(1) Check for any looseness or detachment of the fastening bolts.
(2) Whether the sealing condition is good at all places.
2. Inspection during operation
(1) Is there any air leakage or ash leakage.
(2) Check for loose bolts and observe if the glass window material feeding is normal.
3. Shutdown inspection
(1) Tighten all loose bolts.
(2) Damage to the breathable layer canvas.
(3) Remove dust accumulation inside the air chamber.
(4) The accumulated dust at each discharge port must be cleaned to prevent long-term material accumulation from becoming damp and clumping, which may cause blockage when the discharge port is operated again.
10、 Main advantages
Due to the lack of transmission components in conveying materials, the air chute is easy to seal and manage. The new coating breathable layer used has the characteristics of corrosion resistance, wear resistance, low moisture absorption, light weight, and smooth surface; The whole machine has the following advantages:
1. No running parts, minimal wear, easy maintenance, material saving, no noise, good sealing
2. Simple construction, light weight, reliable operation, and high delivery capacity,
3. Easy to change the conveying direction, and can also feed and unload at multiple points.
4. Easy to operate and reliable in work.
5. Low air pressure, low power consumption, and low power consumption.
11、 Main drawbacks:
1. Only suitable for conveying flowable and dry powdered materials.
2. The conveying distance is short, generally not exceeding 100 meters
3. Requires a high installation space and cannot be transported upwards, limiting its range of use.
12、 The difference between air conveying chute and material sealing pump
1. Air conveying chutes are commonly used to transport dry powder materials, also known as air chutes. Like material sealing pumps, air conveying chutes are sealed, low-pressure conveying equipment. The difference between the two is that material sealing pumps can be used for vertical conveying, while air conveying chutes can only be used for horizontal conveying, with a general slope requirement of 3-6 °.
2. The material sealing pump belongs to the pump internal transportation, while the air conveying chute is transported in the chute. Compared with the two, each has its own advantages.
3. Due to the large space of the air conveying chute, the conveying capacity is large and the output is high. The material sealing pump can meet the needs of various sites due to its design for multiple types of conveying.
4. There is also a significant difference in appearance between the two.
