Problem Analysis and Maintenance Methods of REXROTH Piston Pump in Germany
There are various types of REXROTH plunger pump structures in Germany, and their common feature is that each plunger is arranged in the radial direction of the transmission shaft, that is, the line of each plunger is perpendicular to the line of the rotating shaft. Because the plungers of this hydraulic machinery can be arranged in multiple columns, there are more plungers as a pump, resulting in a higher flow rate. According to the different ways of flow distribution, it can be divided into two types: axial flow distribution and valve flow distribution. Here, taking the axial flow radial piston pump as an example.
(1) Structure and working principle of REXROTH plunger pump in Germany
The German REXROTH plunger pump is mainly composed of a stator, cylinder body, liner, column, and distribution shaft.
(2) Analysis of Problems with REXROTH Piston Pump in Germany
According to the analysis of the structural characteristics of the REXROTH plunger pump in Germany, the contact between the sliding shoe and the stator is a line contact, which is particularly prone to wear and tear, and may be the problem point. Through disassembly and inspection, it was found that the contact arc surface between the sliding shoe and the stator was severely worn. The alloy layer on the arc surface had already been worn, and some of the alloy layer had been worn off. The degree of wear on the inner surface of the stator was slightly lighter, only scratches. Because the thrust surface of the sliding shoe arc is greater than the thrust surface on the piston, it cannot tightly adhere to the inner surface of the stator, resulting in insufficient sealing and increased internal leakage, which makes it impossible for the hydraulic system to establish a high pressure.
(3) Maintenance method for radial piston pump with axial flow distribution
According to the degree of damage to the shaft, remove the damaged layer and grind it to a certain scale for later use. Generally, shafts that have been worn for * times can be repaired. New shaft sleeves are manufactured based on the size of the processed shaft and the degree of wear of the shaft sleeve. In actual repairs, the shaft sleeve was abandoned to preserve the shaft, and the bearing part of the shaft sleeve was reduced in size to restore its fitting depth due to the wear of the rolling needle during the machining of the shaft sleeve.
When selecting the REXROTH plunger pump model in Germany, the following points should be noted:
1. Determine the required flow range for oneself. The nominal flow rate of the plunger pump model is the rated flow rate, and appropriate margin range should be considered when selecting.
2. According to one's own requirements, determine the applicable pressure level. The rated pressure of Rexroth plunger pumps can reach 2.0-2.5MPa. Variable displacement pumps should be used when using filter presses, and low-pressure pumps should be used for slurry transportation to reduce waste.
3. Determine the working conditions of the medium. Large particles are not allowed to appear in the medium conveyed by the plunger pump, otherwise it will cause work failure. Stainless steel plunger pumps should be selected for occasions with requirements for iron pollution, and anti-corrosion plunger pumps should be selected for acidic or alkaline media.
4. After determining the above parameters, choose the standard model according to the principle of preferring large over small.
5. If you are unsure how to choose, you should explain your requirements, environment, and machinery to the personnel of the Rexroth plunger pump, and ask them to help select the Rexroth plunger pump model.
Summary: Based on the above points, we can basically conclude that the selection of Rexroth plunger pump models should consider the flow range, pressure rating, and medium working conditions. The selection principle is to choose large rather than small. If you don't understand, you can choose Yite Hydraulic. As a German REXROTH plunger pump, we will provide you with detailed answers.
The German REXROTH plunger pump is a hydraulic pump that is installed in parallel with several plungers (usually 3 or 6), and uses a crankshaft to push the plungers back and forth through a connecting rod slider or an eccentric shaft to achieve liquid suction and discharge. They also use valve type distribution devices, and most of them are quantitative pumps. The emulsion pump in the coal mine hydraulic support system is generally a horizontal plunger pump. The emulsion pump is used in coal mining faces to provide emulsion for hydraulic supports. Its working principle relies on the rotation of the crankshaft to drive the piston to perform reciprocating motion, achieving suction and discharge.
The German REXROTH plunger pump is a plunger pump in which the reciprocating motion direction of the piston or plunger is parallel to the cylinder axis. The axial piston pump operates by utilizing the volume change generated by the reciprocating motion of the plunger parallel to the transmission shaft in the plunger hole. Due to the fact that the plunger and plunger hole are both circular parts, high precision fitting can be achieved, resulting in high volumetric efficiency.
German REXROTH piston pumps are divided into two types: pressure oil supply type and self suction type. Pressure oil supply hydraulic pumps mostly use hydraulic oil tanks with air pressure. Hydraulic oil tanks that rely on air pressure for oil supply must wait for the hydraulic oil tank to reach the required air pressure before operating the machine after each start-up. If the machine is started when the pressure in the hydraulic oil tank is insufficient, it will cause the sliding shoes inside the hydraulic pump to pull off, resulting in abnormal wear of the return plate and pressure plate inside the pump body. [1]
German REXROTH piston pumps can be divided into two categories: valve distribution and shaft distribution. The radial piston pump with valve distribution has a high failure rate and efficiency