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Hydraulic cylinder is the hydraulic energy into mechanical energy, do linear reciprocating movement (or swing movement) of the hydraulic executive components, it is simple in structure, reliable work. When it is used to achieve reciprocating motion, it can be removed from the deceleration device, and there is no transmission gap, and the movement is smooth, so it is widely used in a variety of mechanical hydraulic systems, so why does the mechanical hydraulic cylinder executive mechanism not maintain pressure phenomenon?

1. When there is more air in the hydraulic cylinder of the hydraulic press, the hydraulic cylinder can be made to carry out large stroke reciprocating motion in no-load or light load state until the air is discharged; If the upper part of the hydraulic cylinder is provided with an exhaust device, the exhaust valve screw can be loosened to discharge the gas in the oil. In addition, damaged components that cause air to mix should be repaired.

2. The leakage phenomenon of the hydraulic cylinder is more intuitive. If the piston rod sealing ring or the O-ring of the cylinder head joint face is aging and damaged, it should be replaced; If the piston rod appears axial strain, it can be repaired by plating or replaced with a new rod.

3. Hydraulic cylinder leakage is one of the factors that do not maintain pressure in the hydraulic cylinder, and the fault analysis is not as intuitive as other factors, because valve parts, hydraulic pump leakage or improper regulation of the system relief valve, shunt valve may produce fault symptoms similar to the leakage in the hydraulic cylinder, so before repairing the hydraulic cylinder, we should inquire the hydraulic cylinder working pressure, piston full travel time treatment, etc. Understand whether the phenomenon of the hydraulic cylinder is even or gradual, and compare it with the historical record or standard value.

4. When there is normal phase leakage of the liquid-controlled check valve, the spool should be checked for partial wear or scratches, if the damage is light.

Hydraulic cylinder in the use of the process to a certain extent, the need for positioning support, and the positioning support process usually causes leakage phenomenon, and this phenomenon may cause certain damage to the user, but also is not conducive to the work, therefore, we need to solve the mechanical hydraulic cylinder actuator does not maintain pressure this fault.