Normal oil pressure is an important factor in the work of filter press. If the oil pressure can not be increased and the filter plate can not be pressed, which results in the work can not be carried out normally, then what causes the insufficient oil pressure? Generally speaking, it can be analyzed from the following four aspects:
1. Oil leakage of piston seal in cylinder:
It is difficult and complicated to judge whether the seal ring in the cylinder is worn or damaged because the leakage of oil can not be seen outside the cylinder. The method of judging whether the seal ring in the cylinder is worn or damaged is to make the cylinder press until the cylinder is no longer moving forward and the pressure of the cylinder is no longer rising. Keep the pressure action and remove the return pipe from the joint of the cylinder. If the hydraulic oil in the joint of the return pipe on the cylinder does not stop flowing out, because of the fact that the oil in the joint of the return pipe At this time, the piston has stopped moving, so it can be judged that the piston seal has been damaged and should be replaced. The replacement of this kind of situation is more complicated. Please repair it under the guidance of the manufacturer to avoid danger.
2. Fault of solenoid reversing valve:
The in-and-out tubing can be removed from the cylinder and the electromagnetic reversing valve can be pressed and loosened to check the internal leakage. If the internal leakage is too large, clean or replace the sealing parts with kerosene. Sometimes the smaller internal leakage is not enough to affect the oil pressure, but it will slow down the speed of cylinder advance and retreat. The push rod of reversing valve is short because of long-term impact and wear, or the contact point between armature and push rod is worn, resulting in insufficient reversing stroke of valve core.
3. Insufficient oil level:
Because the hydraulic system of automatic pressure-retaining filter press is in a high pressure state for a long time, some seals will inevitably leak oil. At the same time, after the filter press is used for a period of time, a small amount of hydraulic oil will evaporate and run off naturally, which will lead to the decline of oil level in the tank. When the oil level is too low, the oil pump will not be able to hit the hydraulic oil, so it is necessary to supplement the hydraulic oil.
4. Faults of insufficient oil pressure in hydraulic system with overflow valve failure:
More than half of the oil pressure deficiency of filter press is caused by the failure of overflow valve. If the pressure of the relief valve is adjusted to the maximum and still can not meet the pressure requirements of the filter press, the failure of the relief valve should be considered. The most effective way to judge the failure of relief valve is to replace it with the same type of relief valve. If the pressure can meet the requirements after replacement, it can basically be judged as the failure of relief valve.
The above four factors are the main factors that cause insufficient oil pressure of filter press. Too frequent operation or long running of oil pump will make the oil temperature too high, while too high oil temperature will make the oil quality thinner and the oil pressure can not go up. Therefore, while eliminating mechanical failure, attention should also be paid to the operation specifications.