Analysis and treatment of common faults in hydraulic station of hoist; color: rgb(102, 102, 102); Font family: Microsoft YaHei, " Helvetica Neue", Helvetica, Arial, sans-serif; font-size: 12px;"> Oil leakage and unstable oil pressure. After long-term use, there is a large amount of leakage between the oil collecting circuits of the safety braking device, and between the valve and the oil collecting circuit, and the oil pressure drops, which leads to the failure of opening the valve. The reason is that the screw between them is loose, and the failure can be eliminated by tightening the screw; The reason of unstable oil pressure is that air is mixed in the hydraulic system, so air should be eliminated, or the current filtering of the coil of the electro-hydraulic pressure regulating device is not good, and the coil vibrates up and down, causing unstable oil pressure. It is enough to install electrolytic capacitor to strengthen filtering
The oil pressure value cannot be guaranteed. The reason is that there is air inhalation in the system. There are many bubbles in the oil tank, or there is a large leakage in the overflow valve and the electromagnetic reversing valve. Whether the pipe joint at the oil suction of the oil pump is tightened; Whether the screw of oil absorption filter is tightened; Check the pipeline from the oil suction filter to the oil suction port of the oil pump for air leakage; Check whether the screw of oil pump end cover is tightened; Clean the relief valve spool. If the spool is not flexible in the valve body, you can hold the spool by hand and grind it back and forth in the body; To clean the valve core of electromagnetic directional valve, the valve core is required to move flexibly in the valve body to ensure that the valve core is in place during operation
Zero oil pressure. The reason why the brake does not release and the system has no pressure: the rotation direction of the oil pump is reversed or the oil pump has no output liquid; The overflow valve core on the electro-hydraulic proportional device is stuck and the damping hole is blocked; The oil suction port of the oil pump is blocked and the oil suction filter is blocked; There is dirt in the pressure valve and the poppet valve cannot be closed. Treatment method: correct the rotation direction of the pump and eliminate the fault of the pump; When the relief valve is disassembled for cleaning, it is required to make the valve core move flexibly in the valve body and blow through the damping hole with compressed air; Clean the filter element and check whether the oil suction pipeline is blocked; Disassemble the pressure valve and take down the cone valve core for cleaning
The residual pressure is too high. The main reason is that the distance between the baffle plate on the control rod of the electro-hydraulic pressure regulating device and the nozzle is too small; The orifice of relief valve is too large. Treatment method: adjust or replace the upper baffle of the control rod; Replace the relief valve orifice with a smaller diameter orifice
Secondary brake oil pressure value pressure maintaining performance failure. The reasons for the pressure maintaining fault of the secondary brake oil pressure value are as follows: there is dirt stuck in the large relief valve on the oil circuit block, which makes the valve core not closed tightly; The opening of one-way throttle stop valve is too large, and a large amount of oil is discharged; There is dirt in the electromagnetic directional valve, and the internal leakage is too large. Aiming at this kind of fault, the lower valve core can be cleaned first, the dirt is removed, the spool is put in place, then the one-way throttle stop valve is adjusted to make the opening as small as possible, and to throttling and replenishing oil. span>
