The filter press uses a special filter medium to apply a certain pressure to the object to cause the liquid to percolate out. It is a commonly used solid-liquid separation device. ?In the production process of the filter press, various failures will occur, which will affect the normal production. When a failure occurs, the problem should be analyzed and solved from the place where the problem may occur.
1. Shock phenomenon
When the filter press is in use, sometimes the liquid pressure rises instantly, resulting in a pressure peak, which is much higher than the normal pressure. The pressure pointer exceeds the upper limit of the electric contact pressure gauge. It was originally thought to be a pressure gauge phenomenon. It happens from time to time in the pressure-holding state, and the pressure value is higher than the maximum pressure by 4～6MPa, which is much higher than the maximum pressure.
Install an ordinary pressure gauge on the connecting pipe between the feed inlet of the filter press and the feed pump, install a valve on the feed pipe, open and close the valve many times to control the flow, and readjust the working pressure of each filter press.
2. Influence of oil temperature
It is generally believed that the oil temperature of hydraulic oil is between 10 and 65°C. If the oil temperature is too high, the oil will vaporize and water will evaporate, which will easily cause cavitation of hydraulic components. The oil is oxidized to form colloidal deposits, which can easily block the small holes in the oil filter and hydraulic valve, making the hydraulic system unable to work normally. At the same time, it will accelerate the deterioration of rubber seals, shorten their life, and even lose their sealing performance, causing serious leakage of the hydraulic system.
3. Oil contamination
The cause of hydraulic oil pollution is very complicated. Also, the hydraulic oil itself is constantly producing oil pollution. Therefore, it is very difficult to completely prevent pollution. To extend the service life of hydraulic components, ensure the normal operation of the hydraulic system, and reduce leakage, a practical method is to control the pollution degree of hydraulic oil within a certain limit. Generally, do not paint the inner wall of the fuel tank to avoid sedimentation in the oil.
4. Filter out impurities produced by the system
Filters of appropriate precision should be installed in the relevant parts of the system, and the filter element should be checked, cleaned, or replaced regularly. Before adding the new oil to the oil tank, it must be settled and filtered before it can be added to the system. If necessary, an intermediate oil tank can be set to settle and filter the new oil to ensure the cleanliness of the oil.
5. Pressure
Adjust the working pressure of the first filter press according to a different plate and frame media and filter press pump head. Under the premise of ensuring product quality, select reasonable pressure to protect all hydraulic components. Re-adjust the working pressure of the system. The total working pressure of each filter press system is far greater than the working pressure after the update. This is the main reason for the leakage of the hydraulic components of the filter press during the filter press process.
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