The oil heating and high temperature of the hydraulic system of engineering engineering machinery will cause malfunctions such as inflexible operation, discontinuous operation, weak work and reduced working pressure. In this article, Dalan Hydraulics will analyze the causes and hazards of oil heating together with you, and how to solve the high temperature method.
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1, the cause of oil heating
1 The tank volume is too small, the heat dissipation area is not enough, the oil cooling device is not installed, or the cooling device is used, but its capacity is too small.
2 According to the fast-forward speed, the fixed-pump oil supply system of the pump capacity is selected. During operation, most of the excess flow will overflow from the overflow valve under high pressure and generate heat.
3 In the system, the unloading circuit is faulty or the unloading circuit is not set. When the pump stops, the oil pump cannot be unloaded. The entire flow of the pump overflows under high pressure, causing overflow loss and heating, which causes the oil to heat up.
4 The system pipeline is too long and too long, too much bending, local pressure loss and pressure loss along the path.
5 The hydraulic components are not accurate enough and the assembly quality is poor, and the mechanical friction loss between the relative movements is large.
6 The fitting clearance of the fittings is too small, or the wear is too large, resulting in excessive clearance, large internal and external leakage, resulting in large volume loss, such as the volumetric efficiency of the pump is reduced, and the heat is fast.
7 hydraulic system working pressure adjustment is higher than the actual needs. Sometimes it is necessary to increase the pressure to work because the seal is too tight, or because the seal is damaged or the leak is increased.
8 The temperature of the climate and operating environment is high, causing the oil temperature to rise.
9 Select the viscosity of the oil is not good, the viscosity is large, the viscous resistance is large, and the viscosity is too small, the leakage increases, and both cases can cause the oil to heat up.
2. Hazard of excessive hydraulic pressure
1 The machine is thermally deformed, and the moving parts with different thermal expansion coefficients in the hydraulic components are stuck due to the small matching gap, causing malfunction and affecting the transmission precision of the hydraulic system, resulting in deterioration of the working quality of the components.
2 The viscosity of the oil is lowered, the leakage is increased, and the volumetric efficiency of the pump and the efficiency of the entire system are significantly reduced. As the viscosity of the oil is lowered, the oil film of the moving parts such as the spool is thinned and cut, and the frictional resistance is increased, resulting in an increase in wear.
3 Deform the rubber seal, accelerate the aging failure, reduce the sealing performance and service life, and cause leakage.
4 accelerate the oxidation and deterioration of the oil, and precipitate the asphalt material to reduce the service life of the hydraulic oil. The precipitate blockages the damper orifice and the slit valve port, causing the pressure valve to be stuck and unable to move, the metal pipe being elongated, bending, or even rupturing.
5 The air separation pressure of the oil is lowered, the dissolved air in the oil escapes, and air pockets are generated, resulting in a decrease in the working performance of the hydraulic system.
3, the solution to the temperature
1 According to different load requirements, always check and adjust the pressure of the relief valve to make it just right.
2 Reasonable selection of hydraulic oil, especially oil viscosity, try to use a lower viscosity to reduce viscosity friction loss when conditions permit.
3 Improve the lubrication condition of the moving parts to reduce the friction loss, which is beneficial to reduce the working load and reduce the heat.
4 Improve the assembly quality and accuracy of the hydraulic components and hydraulic system, strictly control the matching clearance of the fittings and improve the lubrication conditions.
5 Use a sealing material with a small friction coefficient and an improved sealing structure to reduce the starting force of the hydraulic cylinder as much as possible to reduce the heat generated by the mechanical friction loss.
6 Add the necessary cooling device.
-----Responsible Editor: Dalan Oil Pump Motor 02-Procurement Consultant
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