The impact of high temperature of the hydraulic oil of a four-column hydraulic machine is the same as the hazard of oil contamination of a hydraulic machine. The increase in the oil temperature of a hydraulic machine is a long-term failure.
The main working medium of the Hydraulic Press is the working mode of transmission by the hydraulic oil. The mechanical heat generated by the mechanical friction during the operation of the equipment and the volume heat generated by the hydraulic oil of the hydraulic press during the working process due to the pressure and the volume heat generated during the downward process of the hydraulic cylinder , Is the main reason for the heat generated by the hydraulic press. Below we analyze the main ways to cool down the oil pressure machine:
- ①The heat released when the outside temperature is lower than the temperature of the equipment itself;
- ②When the hydraulic oil passes through the pipeline mailbox, it is cooled by the difference between the passing surface of the machine body and the outside temperature;
- ③The heat is dissipated through a hydraulic machine or a heat dissipation system installed at a hydraulic station;
- ④The hydraulic machine will cool down when the operation is stopped or the operator is resting.
Excessive temperature rise will cause the following faults and adverse effects:
- ① The increase of oil temperature of the hydraulic machine will reduce the oil content and increase the leakage. The volumetric efficiency of the pump and the efficiency of the entire system will be significantly reduced by 16%. Due to the lowering of the pitch, the oil film of the 12%90 moving parts such as the slide valve becomes thinner and cut, and the frictional resistance 180 increases, which leads to increased wear and heat generation of the hydraulic machine, resulting in a 125% higher temperature rise;
- ②Hydraulic engine oil temperature is too high, which causes thermal deformation of the machine, and 100%-60 makes the gap between moving parts with different thermal expansion coefficients in hydraulic components become smaller and stuck, causing malfunctions and affecting the accuracy of hydraulic equipment. The quality of parts processing has deteriorated;
- ③High oil temperature of the hydraulic engine will also deform the rubber seals, premature aging and failure, reduce the service life, lose the sealing performance, and cause leakage. Leakage will cause further heat generation and temperature rise;
- ④ The high temperature of the hydraulic oil will accelerate the oxidation and deterioration of the oil, blast the precipitation of bituminous substances, and reduce the service life of the hydraulic oil. The precipitates block the damping orifice and the slit valve port, leading to failure of pressure regulation, unstable flow of the flow valve, stuck and non-reversing directional valve, elongation and bending of the metal pipe, or even rupture.
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