What are the requirements for setting the exhaust device of the hydraulic press

If the hydraulic system of the hydraulic press is mixed with air, it will lead to the occurrence of cylinder oscillation or creeping, so that the hydraulic system can not operate normally, in order to avoid air entering the cylinder and discharge the air as soon as possible, it is best to install an exhaust device.

Under normal circumstances, for hydraulic cylinders with low hydraulic press requirements, a special exhaust device is often not planned, but the oil port is arranged at the highest point of the two ends of the cylinder of the cylinder, so that the air can be discharged to the tank with the oil and escape from the tank; For hydraulic cylinders and large hydraulic cylinders with high speed stability requirements, a special exhaust device is often required, and its orientation is also the highest point of the hydraulic cylinder of the hydraulic press. For example, when the exhaust plug is placed at the highest part of the cylinder head, loosen the screw during the exhaust, so that the cylinder moves repeatedly in the full stroke until the oil is discharged, and tighten the screw after the exhaust is finished.

Hydraulic cylinder mixed with air will cause the hydraulic press to creep, in addition, the causes of hydraulic cylinder creep also include the following:

1. Internal astringency of hydraulic cylinder. The internal parts of the hydraulic cylinder are improperly installed, the parts are deformed, worn or the shape and position of the public service is beyond the limit, and the action resistance is too large, so that the speed of the hydraulic cylinder piston changes with the different stroke orientation, showing slip or creep.

2, poor lubrication or hydraulic cylinder bore processing. Due to the relative movement of piston and cylinder, guide rail and piston rod, etc., if poor lubrication or hydraulic cylinder bore is abnormal, it will increase wear and reduce the straightness of cylinder center line.

3, the quality of the hydraulic seal has a direct relationship with slip or creep.