What are the reasons for the heating of hydraulic components of a hydraulic press

What are the reasons for the heating of hydraulic components of a Hydraulic Press

When the temperature of the components and fuel tank in the hydraulic system of a hydraulic press reaches 70 degrees or more, it can be considered to be working at high temperature. At this time, it should be considered to add a cooling device to the fuel tank of the system. If it is operated at high temperature for a long time, the life of the hydraulic components It will be shortened due to early wear and tear. Therefore, solving the system temperature problem should be a matter of constant attention for hydraulic technicians.

In order to have a deep understanding of the heating principle of the hydraulic system, we will analyze the related problems as follows:

The heat sources are mainly two heat sources:

Fluid friction heat generation

Leakage factors: Whether it is a hydraulic pump, a hydraulic valve or a cylinder, as long as the liquid is quickly squeezed out of the fitting gap in the component, it will generate liquid friction and cause heat. The squeezed out oil should not flow away. , Only because the accuracy of the hydraulic components is not well matched or the hydraulic components are worn out and the gap is large.

Displacement factor: The choice of oil pump displacement is sufficient in principle. If the displacement is selected large, the excess flow will be discharged by the speed control valve or overflow valve, and the excess flow will be with The original flow rate is squeezed in a small pipeline space, and the flow rate will increase during normal flow, and frictional heating is inevitable.

Overflow factor: In any hydraulic system, the liquid will not be 100% utilized, and the pressure and action cannot be separated from the overflow valve’s interception. The process of liquid interception is a process of friction and heating.

Pressure factor: In order to make the liquid reach pressure (pressure difference) in the shortest time, generally we usually have two methods. One is that there is a little difference in the size of the oil inlet and the oil outlet, and the oil outlet is smaller than the inlet Oil port, the second is to block the oil outlet, and use the overflow valve to control the flow of the outlet. When the amount of oil flowing out is less than the amount of oil entering, the liquid in the oil pump will accumulate more and more, because the oil is Incompressible, pressure is formed inside. When oil passes through a narrow passage, the oil will pass at the fastest speed due to pressure. At this point, the faster the flow rate, the higher the temperature, and friction heats up It worked again.

Mechanical friction heat

Motor factor: The motor itself will also generate heat due to work, but it can be ignored because it is far away from the oil pump.

Hydraulic oil pump factors: the friction of the bearing of the oil pump will generate heat after being subjected to external force, the friction between the blade and the rotor will generate heat, and the friction between the blade and the stator will also generate heat.

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