What causes the hydraulic pump for wrench to problems?
There is one important component in the hydraulic wrench: the hydraulic pump. The hydraulic pump is a power component of the hydraulic system, and is driven by an engine or an electric motor to suck oil from the hydraulic oil tank to form a component that is discharged to the actuator. The hydraulic pump is divided into a gear pump, a plunger pump, a vane pump and a screw pump according to the structure.
One of the problems often encountered in hydraulic pump maintenance: the pressure of the hydraulic system is abnormal, and the pressure does not go up or down.
Pressure is one of the two most basic parameter parameters of the hydraulic system, which largely determines the performance of the hydraulic system. This failure is manifested as: when the hydraulic system is pressure-regulated, the pressure of the adjustment failure system cannot be established, the pressure is insufficient, or even no pressure at all, or the pressure cannot be adjusted, or the pressure is lowered after the rise and the pressure is unstable. , pressure fluctuations and other phenomena.
- Causes of stress disorder
The hydraulic pump causes no flow output or insufficient output flow; the pressure regulating valve such as the overflow valve is faulty; the unloading valve is stuck in the unloading position, the system is unloaded, the pressure is not gone; the system is leaking inside and outside; the valve mounting plate (Integrated block) The position of the pressure oil passage and the oil return passage are collided inside; the spool of the reversing valve is not reversing and moved into position, causing the pressure oil chamber and the return chamber cavity; the lock of the hydraulic cylinder piston and the piston rod is locked. The nut is loose and the piston runs out of the piston rod, allowing the two chambers of the hydraulic cylinder to communicate with each other.
2, the impact of pressure disorders
The actuator does not operate or acts, but stops or loses when it is loaded, and can not overcome the load; the hydraulic system can not achieve the correct working cycle, especially in the sequential action circuit of pressure control; some valves relying on pressure control can not work For example, hydraulic directional control valves, hydraulic control check valves, cartridge valves, pressure relays, etc., which also cause the hydraulic system to not work properly; the speed of the actuator is insufficient due to the load flow, and the speed of movement is reduced; Produce faults including security incidents.
3, the method of troubleshooting the pressure disorder
Replace the motor wiring, correct the direction of rotation of the hydraulic pump for wrench, replace the motor with matching power; correct the direction of the inlet and outlet of the hydraulic pump, especially the non-reversible pump; properly thicken the size of the suction pipe of the pump, strengthen the seal at the joint of the suction line, Clean the oil filter, etc.; eliminate the directional valve failure, install the unloading valve to eliminate the failure of the unloading valve; identify the specific location of the internal leakage and external leakage, eliminate the internal and external leakage faults; check the hydraulic cylinder.
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