What constitutes the low pressure of the gantry crane hydraulic system?

The abnormal pressure of the gantry crane hydraulic system is mainly manifested in that the working pressure cannot be set. It cannot rise to the adjustment value or it falls after rising. The reason is often related to the engine, pump, valve and other components.

1: The pressure of the gantry crane system is low.

These problems are usually caused by endoleaks, the primary causes being:

The gantry crane hydraulic pump is worn out, forming a gap, unable to adjust the pressure, and also reducing the output flow. Due to the wear of the main spool and the mating surface of the relief valve, the operating pressure (secondary pressure) of the relief valve decreases, resulting in a drop in system pressure. The actuator (hydraulic cylinder or hydraulic motor) is worn or the seal is damaged, causing the system pressure to drop or unable to maintain the original pressure. If there are multiple actuators in the system, the pressure of one actuator is abnormal, and the pressure of other actuators is normal, indicating that this There is a problem with the fulfillment. There is an open space on the relevant valve in the system, which causes a leak, which reduces the pressure.

2: The pressure of the gantry crane system is too high, and the adjustment is invalid.

The cause of this problem is generally the overflow valve, that is, the failure of the overflow valve. When the main spool is in the closed position, the system pressure will inevitably rise and cannot be adjusted at the spool joint. After the pilot control oil circuit of the relief valve is blocked, the control pressure rises sharply, and the system pressure rises suddenly.

3: Other reasons for abnormal pressure of gantry cranes and their elimination.

The oil filter is blocked. The fluid passage is too small and the oil viscosity is too high to absorb the oil. Clean or replace oil filter, replace hydraulic oil. The air in the oil enters the body. It should be ventilated. The pipe connection is faulty. To check and then pick up. The motor power is not enough and the speed is too low. Motors should be inspected and cleaned if they fail, and if necessary, the motor should be recalibrated. The viscosity of the oil is too low and the leakage is serious. Hydraulic oil and seals to be replaced. Damage the pressure gauge. need to be replaced.