Analysis and treatment of common faults in hydraulic station

1. After long-term use of oil leakage and oil pressure instability, there is a lot of leakage between the various oil collecting circuits in the safety brake installation, as well as between the valve and the oil collecting circuit, and the oil pressure drop causes the valve to be unable to be released. The screw between the two parts is loose, and the problem can be solved by tightening the screw; the reason for the unstable oil pressure is that the air is mixed in the hydraulic system, and the air should be swept away, or the current filtering of the electro-hydraulic pressure regulating installation coil is not good, and the coil vibrates up and down, resulting in oil pressure. Unstable, install electrolytic capacitors to enhance filtering.
 2. The reason that the oil pressure value cannot be guaranteed is that there is air inhalation in the system, the oil in the fuel tank has a lot of foam, or there is a large leakage in the overflow valve and the electromagnetic reversing valve. The solution: check whether the oil pump suction port leaks; the oil pump sucks oil Check whether the pipe joint can be tightened; whether the screw of the oil suction filter can be tightened; check whether the pipeline from the suction filter to the suction port of the oil pump can leak; check whether the screw of the oil pump end cover can be tightened; clean the relief valve spool, if The valve core is insensitive in movement in the valve body, and the valve core can be held by hand to grind back and forth in the body; clean the solenoid valve core, request the valve core to move sensitively in the valve body, and ensure that the valve core is in place during operation.
3. The reason why the zero oil pressure brake does not release the brake system has no pressure: the oil pump rotates in the opposite direction or the oil pump does not output fluid; the relief valve spool on the electro-hydraulic proportional installation is stuck, and the damping hole is blocked; the oil pump suction port is not smooth, The oil suction filter is blocked; there is dirt in the pressure valve, and the poppet valve cannot be closed. Disposal method: correct the rotation direction of the pump, remove the fault of the oil pump; disassemble and clean the overflow valve, make sure that the valve core moves sensitively in the valve body, and blow the damping hole with compressed air; clean the filter element and check the oil suction pipe Whether the road is blocked; disassemble the pressure valve, remove the poppet valve core and clean it.
4. Excessive residual pressure Excessive residual pressure will make the brake useless. The main reasons are: the distance between the baffle plate on the control rod installed on the electro-hydraulic pressure regulator is too small from the nozzle; the orifice of the relief valve is too large. Solution: Adjust or replace the upper baffle of the control rod; replace the throttle hole of the relief valve with a throttle hole with a smaller diameter.
5. The reasons for the failure of the secondary brake oil pressure value and pressure holding performance are as follows: the large overflow valve on the oil circuit block is stuck with dirt and the spool is not tightly closed; The opening of the one-way throttle stop valve is too large, and a large amount of oil leaks out; there is dirt in the electromagnetic reversing valve, and the internal leakage is too large. In response to this kind of fault, the valve core can be removed first for cleaning, remove the dirt, make the valve core in place, and then adjust the one-way throttle stop valve to make the opening teeth as small as possible to play the role of throttling and oil replenishment.
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