What is the working condition of REXROTH accumulator?
The working condition of REXROTH accumulator is that during normal operation, the load is intermittent and requires a small flow rate. After selecting an accumulator, the accumulator provides the necessary oil for operation, and the hydraulic pump replenishes the fluid. The REXROTH accumulator can use a low-power oil pump motor group, making the entire hydraulic system small in size and lightweight. In special circumstances, when the load requires a large flow rate, the accumulator and hydraulic pump can supply fluid simultaneously and meet the usage requirements; When the load is not working, the accumulator is filled with liquid to maintain the set pressure, and the motor pump unit does not operate, making the system very energy-efficient.
The types of REXROTH energy storage devices are mainly divided into spring type and inflatable type. The functions of REXROTH accumulator include (1) short-term oil supply, (2) system pressure maintenance, (3) emergency energy, (4) easing impact pressure, and (5) absorbing pulsating pressure. The functions of accumulator mainly include energy storage, hydraulic shock absorption, pulsation elimination, and energy recovery.
*Class: Energy Storage. This type of function can be further divided into: ① serving as an auxiliary power source to reduce installed capacity; ② Compensate for leakage; ③ Perform thermal expansion compensation; ④ Be an emergency power source; ⑤ Forming a constant pressure oil source.
Category 2: Absorb hydraulic shock. The sudden reversal of the directional valve and the sudden stop of the actuator movement will generate pressure shock in the hydraulic system, causing the system pressure to rise rapidly in a short period of time, resulting in damage to instruments, components, and sealing devices, as well as vibration and noise. To achieve absorption efficiency, the accumulator should be placed near the impact point, so it is generally installed before the impact source such as the control valve or hydraulic cylinder, which can effectively absorb and buffer hydraulic impacts.
Three categories: eliminating pulsation and reducing noise. For hydraulic systems that use plunger pumps and have fewer plungers, periodic changes in pump flow can cause vibration in the system. Installing an accumulator can absorb energy from pulsating pressure and flow rate during one cycle of flow pulsation. The part of the oil with instantaneous flow rate higher than the average flow rate is absorbed by the accumulator, and the part with flow rate lower than the average flow rate is supplemented by the accumulator. This absorbs the energy in the pulsation, reduces the pulsation, and minimizes the damage to sensitive instruments and equipment.
Four categories: energy recovery. The use of energy storage devices to recover energy is a field that has been extensively studied. Energy recovery can improve energy utilization efficiency and is an important way to save energy. Accumulators can be used to recover various functional and positional potentials because they can temporarily store energy. The main research in this area includes: ① recovering vehicle braking energy; ② Recycling the potential energy of the boom mechanism of construction machinery; ③ Recycling hydraulic excavator turntable braking energy; ④ Recovering the gravitational potential energy of oil well repair rigs and drilling rig pipes falling; ⑤ Recovering the downward gravitational potential energy of the elevator.
REXROTH accumulator usage and maintenance
The use and maintenance of REXROTH accumulator mainly include installation, maintenance, fault diagnosis and troubleshooting, and repair of the accumulator. The installation of REXROTH accumulator includes pre installation inspection, installation, nitrogen charging, etc. Proper installation, fixation, and inflation are important conditions for the normal operation and proper functioning of the accumulator. The measurement of parameters and the correct use of various tools and instruments cannot be ignored.
The REXROTH accumulator should be leak proof during use, and the airbag should be regularly checked for airtightness and other aspects. Therefore, daily inspections and maintenance are essential. Daily inspection refers to the use of simple methods such as visual, auditory, tactile, and instrumentation to examine the appearance and condition of the equipment. During the inspection, attention should be paid to both the local area and the overall equipment. Any abnormal situation discovered during the inspection that hinders the continued operation of the accumulator should be dealt with urgently; For others, they should be observed and recorded during light rain, and resolved during regular maintenance. Some damaged components also need to be replaced in a timely manner. Active maintenance is a new equipment management theory proposed after fault repair, preventive maintenance, and condition based maintenance. Its definition is to repair the fundamental parameters that cause equipment damage, effectively preventing failure and extending the service life of the equipment. Proactive maintenance is a measure taken to address the root cause of equipment wear and tear before it occurs, effectively controlling the occurrence of wear and failure, thereby significantly extending the repair cycle. Proactive maintenance not only provides operational support for hydraulic equipment and components, but also significantly reduces maintenance costs.
REXROTH accumulator is a hazardous component in hydraulic systems, so special attention should be paid to safety during operation. The diagnosis and troubleshooting of accumulator faults include both the diagnosis and troubleshooting of the REXROTH accumulator itself and the diagnosis and troubleshooting of the hydraulic system where the accumulator is located, which are intertwined with each other. The main tasks of fault diagnosis include: ① determining the nature and severity of the fault. Based on the on-site conditions, determine whether there is a malfunction, what kind of problem it is (pressure, speed, action, or other), and the severity of the problem (normal, minor, general, or serious). ② Search for failed components and their locations. Based on the symptoms and relevant information, identify the fault point in order to further troubleshoot, mainly to clarify "where the problem lies". ③ Further investigate the initial cause of the malfunction.