Analysis of Hydraulic Press Journal oil leakage causes

To solve the problem of oil leakage at the Journal of hydraulic press, the main measures are to prevent excessive axial clearance

1. In order to prevent oil leakage at the shaft extension, two self tightening rotating rubber sealing rings are installed at the journal when designing gear pump.

2. When the gear pump is used for a long time, it is basically caused by the aging, damage or deterioration of the sealing of the pipeline connection part, the oil temperature is too high and the oil viscosity is too low. Therefore, the causes can be dealt with.

During the processing of control valve, the coaxiality and chamfering requirements specified in the design drawing are not met, which is the main cause of oil leakage.

The chamfering at both ends of the valve core of hydraulic press can not be used to 45 degrees. This kind of chamfering is harmful. When assembling the valve core into the valve body, it is easy to get stuck in the O-ring. There are three situations

1. When the coaxiality of the valve body hole to the O-ring groove exceeds the specified value, the O-ring is placed in the groove, with a large amount of compression on one side and a small amount on the other side. In case of serious over tolerance, half a circle or one circle of O-ring will be cut off when the valve core is installed into the valve hole. The factory test is carried out on the test bench. Due to the short time, low oil temperature and no back pressure, oil leakage will not be found. When it is used on the hydraulic equipment for a period of time, oil leakage begins.

2. The coaxiality of the O-rings at both ends of the valve body and the main valve hole is qualified, and the chamfering at both ends of the valve core should be 15 ° - 20 ° and the O-ring will be broken if it is greater than the specified value.

3. Both of them are qualified. Lubricating oil is not applied to the valve hole, O-ring and valve core during assembly, and a piece of O-ring can be cut off when installing valve core into valve body.

Therefore, to solve the problem of oil leakage in the Journal of hydraulic press, we should start from the two processes of processing and assembly, so that the hydraulic components do not leak.