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Reasons for abnormal pressure of three-beam four-column hydraulic press

by:WORLD     2022-11-20
The abnormal pressure of the three-beam four-column hydraulic press is the most common fault in the daily use process. This paper analyzes the reasons for the abnormal pressure of the three-beam four-column hydraulic press, and finds out the method to deal with the abnormal pressure of the four-column hydraulic press.








1. No pressure in the hydraulic system

1. During the operation of the four-column hydraulic press, the pressure of the hydraulic system of the hydraulic press drops to zero and cannot be adjusted.

Reason: The problem of the pressure regulating system of the hydraulic press itself, the orifice of the relief valve is blocked, the sealing end of the relief valve has foreign matter; the main core valve of the relief valve is stuck in the opening position, and the electromagnet of the unloading reversing valve is blocked. Burn out, resulting in disconnection of wires or loss of electrical signals, resulting in interruption of electrical control signals.



2. The four-column hydraulic press restarts after a pause, and the pressure is zero.

Reason: The position where the relief valve is opened is rusted, the motor of the hydraulic pump rotates, and the hydraulic pump does not absorb oil due to blockage of the filter or leakage of the oil suction pipe.



3. After the four-column hydraulic press is disassembled, inspected and maintained, the pressure is zero.

Reasons: a. The connection of the hydraulic pump is faulty and the working circuit cannot be formed.

b. There is no oil in the hydraulic pump, so the sealing oil film cannot be formed.

c. The core of the directional switching valve is installed reversely, and the directional switching valve is installed reversely. If there is a u-shaped directional switching valve in the system, once it is installed reversely, the hydraulic system will be free of pressure.












2. Low pressure of four-column hydraulic press

Reason: 1. The hydraulic pump of the four-column hydraulic press is worn, forming a gap, and the pressure cannot be adjusted, which reduces the output flow.



2. The main valve body and mating surface of the relief valve of the four-column hydraulic press are worn, which reduces the operating pressure of the relief valve and reduces the system pressure



3. The seal is damaged, which reduces the system pressure and cannot maintain the original pressure.



4. There are gaps in the relevant valves and valve plates in the hydraulic system of the four-column hydraulic press, which constitute leakage and reduce the pressure.












3. The pressure of the four-column hydraulic press system is high, and the adjustment is invalid

Reasons: 1. The relief valve of the four-column hydraulic press does not work, and the main valve body is fixed or rusted in the closed position, which will inevitably cause the system pressure to rise and cannot be adjusted.



2. After the pilot operating circuit of the relief valve of the four-column hydraulic press is blocked, the operating pressure increases sharply, and the system pressure also rises sharply.










4. The pressure drift or fluctuation of the three-beam four-column hydraulic press

Reasons: 1. The main reason for the pressure drift of the four-column hydraulic press is the change of oil temperature. When the oil temperature rises, the oil viscosity decreases, causing the change of the system pressure.



2. The hydraulic system design of the three-beam four-column hydraulic press is unreasonable. For example, the hydraulic pump is too large, the actual load flow is small, and most of the oil overflows through the relief valve, which saves the system heat, reduces the oil viscosity, and reduces the pressure. heat, causing the system pressure to drift.



3. The cooling capacity of the hydraulic system of the three-beam four-column hydraulic press is poor.



4. If the adjustment bolt of the relief valve of the three-beam four-column hydraulic press is loose, the pressure of the system will also drop, and the parameter drift of the pressure valve control circuit will cause the signal drift, which will eventually lead to the drift of the operating pressure.





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