Filter press is the most critical oil pressure, if the oil pressure is not enough then the filter can not work, industrial production will be due to mechanical reasons and delay, to the enterprise caused no measurable losses. A good filter press is expected by many industrial manufacturers. But as a mechanical device, if not artificially standardized operation, the occurrence of the fault that is a necessary event. Oil pressure is a common filter failure, the main performance of the hydraulic work when the pressure does not increase, the pressure plate can not be pressed for a lot of reasons, the common has the following:
1, the oil temperature is too high operation is too frequent or long operation of the oil pump will make the oil temperature is too high, and the oil temperature is too high will make oil thinning, oil pressure on;
2, the hydraulic system outside the leak, there are areas where the oil spill, mainly in a number of sealing surface, such as tubing joint seal damage oil spill, relief valve, solenoid valve, hydraulic check valve and oil integrated seal Plane leakage, the cylinder piston rod leakage, etc., the fault to judge and deal with more simple and intuitive;
3, the oil tank seal oil leakage due to the oil inside the tank can not see the outside, so to determine whether the seal inside the cylinder wear or damage is more difficult and complex, the method is to make the cylinder for the first pressing action until the cylinder is no longer forward , The cylinder pressure is no longer elevated, to maintain the compression action, the return pipe from the cylinder joints at the open, if the oil tank on the return pipe joints at the hydraulic oil kept out, because the piston has stopped at this time, it can determine the piston seal Is damaged and should be replaced.
As shown in Figure 4, the electromagnetic reversing valve failure from the cylinder at the opening and closing of the tubing and the electromagnetic valve for the compression and release action check the internal leakage. If the internal leakage is too large, use kerosene to clean or replace the sealing parts. Sometimes the smaller internal leakage is not enough to affect the oil pressure, but will slow down the cylinder speed.
5, the oil level is not enough because the automatic pressure filter press hydraulic system for a long time in a high-pressure state, some seals will inevitably be oil, while the filter press for some time, the hydraulic oil will be a small amount of natural evaporation loss, which led to Oil tank oil level drop, when the oil level is too low, the pump will not hit, need to add hydraulic oil;
As shown in Figure 6, the relief valve failure hydraulic system failure of hydraulic failure, more than 50% of the relief valve failure caused. If the relief valve pressure is adjusted to the maximum can not meet the pressure of the filter press, you should consider whether the overflow valve failure. The most effective way to determine the fault of the relief valve is to replace the method, put on the same model of the relief valve trial, such as the pressure after the requirements can be achieved, basically can be judged as a relief valve failure.http://www.jlfilterpress.com/