Automatic cleaning of hydraulic oil filter elements can be achieved in the following ways:
1. ** Backwash method **
- ** Principle ** : Use the water flow opposite to the normal filtration direction to rinse the filter element. When the filter element is gradually blocked by impurities during the working process, resulting in a rise in the pressure difference between the front and the back to a certain extent, the specific valve is switched to make the cleaning liquid flow through the filter element in the reverse direction, and the impurities attached to the surface of the filter element are washed away.
- ** Implementation ** : It is usually necessary to set two steering ball valves or similar control valves, one for normal operation of oil, the other for backwash water. When cleaning is needed, close the normal working oil inlet valve, open the backwash inlet valve, let the cleaning liquid reverse through the filter element, and then discharge the cleaning liquid containing impurities from the sewage outlet.
2. ** Ultrasonic cleaning method **
- ** Principle ** : ultrasonic wave propagation in the liquid will produce cavitation effect, countless bubbles in the instant rupture produce a strong impact force, can effectively remove the surface of the filter dirt and impurities.
- ** Implementation method ** : Put the hydraulic oil filter element into the ultrasonic cleaning tank containing the cleaning fluid, and the ultrasonic vibration head and transducer are installed at the bottom of the cleaning tank. The upper and lower position of the transducer is controlled by the adjusting mechanism to maintain the best distance between the ultrasonic vibrating head and the filter element, generally controlled at about 3-5cm. At the same time, the driving mechanism controls the ultrasonic vibration head to move reciprocally along the axis of the filter element to ensure that all parts of the filter element can be fully cleaned.
3. ** Pulse cleaning method **
- ** Principle ** : By rapidly releasing high pressure gas or liquid in a short time, a pulse pressure wave is formed, which affects the impurities on the surface of the filter element and makes it loose and fall off.
- ** Implementation method ** : Set the pulse generator device in the hydraulic system, when the filter element needs to be cleaned, the pulse generator produces high pressure pulse, the cleaning liquid is sprayed to the surface of the filter element in the form of pulse, and at the same time cooperate with reverse washing or vibration and other operations to improve the cleaning effect.
4. ** Chemical cleaning **
- ** Principle ** : The use of specific chemical reagents and the surface of the filter fouling chemical reaction, so that it is dissolved or decomposed, so as to achieve the purpose of cleaning.
- ** Implementation method ** : First, the hydraulic oil filter element is removed from the system and put into the container containing chemical cleaning fluid. The composition of the cleaning solution is selected according to the material of the filter element and the nature of the dirt. For example, for the metal mesh or copper mesh filter element, kerosene can be used to soak and add the appropriate cleaning agent; For some organic pollutants, alkaline or acid cleaning solutions can be used. After soaking for a period of time, rinse with clean water, and finally dry.
In short, these automatic cleaning methods have their own characteristics, and the appropriate cleaning method can be selected according to the actual needs to improve the cleaning efficiency of the hydraulic oil filter element and the stability of the maintenance system.