Reasons for the failure of the hydraulic oil pressure system
Failure of hydraulic oil pressure system due to hydraulic oil contamination
More than 75% of the failure rate of the hydraulic system is caused by the pollution of the hydraulic oil. When using the hydraulic oil, it should be regarded as human blood to maintain sufficient cleanliness to ensure that the failure rate of the hydraulic system is reduced to a minimum. In the hydraulic system, the most likely place to cause oil contamination is the oil tank. Many fuel tanks have defects in structural design and manufacturing. The most common is that the 'closed' fuel tank is not properly designed, for example, there is no seal at the joints and nozzles, which leads to the infiltration of dirt into the fuel tank. Contaminated oil enters the hydraulic system and accelerates the wear, corrosion, and blockage of hydraulic components, and finally leads to the formation of failures. In recent years, many manufacturers have done a lot of useful exploration and practice in the design of the fuel tank structure to reduce or prevent pollutants from entering the fuel tank.
For example, a fully enclosed fuel tank structure is adopted, except that there is only one ventilation hole communicating with the atmosphere, the fuel tank adopts a closed structure, and strict sealing devices are provided at all joints and pipes. The fuel filler cap is provided with a filter device to form a vent hole, which makes the liquid level in the fuel tank communicate with the atmosphere to ensure the normal operation of the system, and also prevents external pollutants from entering the fuel tank. Since the oil tank 1 is completely closed, the filter is cancelled at the oil suction port of the pump, and all the return oil is returned to the oil tank through the (return oil) filter on the main oil return line, thus ensuring the cleanliness of the oil in the entire hydraulic system. This structure not only avoids the contamination of the oil in the fuel tank by external dirt. Moreover, because the filter device is removed from the oil suction port, the oil suction resistance is greatly reduced, thereby avoiding the occurrence of cavitation.
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