According to the reason of heat, the heating of hydraulic system of hydraulic power unit can be divided into two categories: one is the heat generated by design reasons;The other is caused by the failure of hydraulic components or improper use of heat.Obviously, the cause of a fever is different and the way to get rid of it is different.

(1) incorrect selection of hydraulic oil, which may result in heating of the hydraulic system.The system works normally when the oil temperature is low.However, after the system has been in operation for a period of time, the oil temperature rises higher and the viscosity of the hydraulic oil decreases.The internal leakage of the system increases, which leads to a high oil temperature rise, forming a vicious cycle of oil temperature.The solution is based on the system load and normal operating temperature requirements to choose the appropriate viscosity of the hydraulic oil.

(2) unreasonable tank design: reduce the heat dissipation effect of hydraulic system. The main function of heating tank is to store hydraulic oil, but it also has the functions of heat dissipation, impurity precipitation and water separation.The unreasonable tank design is mainly manifested in two aspects: first, the tank volume design is too small, because Grundfos pump is a kind of mobile hydraulic equipment, the tank volume is generally about twice the flow of the hydraulic pump, therefore, the fuel tank heat dissipation area and storage oil volume is small;Secondly, some of the oil tank structure design is not reasonable, suction and return oil pipe mouth close, there is no baffle between, so as to shorten the oil tank cooling cycle and path.Precipitate impurity.Most of the return oil even goes directly into the suction pipe, which reduces the heat dissipation of the fuel tank and improves the oil temperature.The solution is to appropriately increase the tank volume to (1125~115) Q and increase the distance between the suction pipe and the return pipe.A baffle between the suction and return lines shall be provided to secure the fuel tank.Heat dissipation power that should be available.Heat treatment method of hydraulic power unit is introduced

In the analysis and description of theoretical tasks, theoretical operating conditions in block diagram scintillation equipment are usually selected.The hollow arrow represents the signal flow, while the solid arrow represents the energy flow.

The actions in the sub-hydraulic loop are sequential - control element reversing and spring return, component extension and retraction, and relief valve opening and closing.The implementation of components and control components is demonstrated based on the corresponding circuit diagram notation, which is also prepared to introduce circuit diagram notation.

According to the system task principle, you can number all loops in turn.If the first implementation component number is 0, the associated control component identifier is 1. If the component identifier corresponding to the implementation component extension is even, the component identifier corresponding to the implementation component undo is odd.

Hydraulic power unit is the most important part of hydraulic lift, which refers to the power drive system composed of hydraulic oil tank and motor.Due to the complex internal structure of the hydraulic power unit and the need for quite professional hydraulic power technology to repair and repair, so in the hydraulic power unit after the problem, the customer is difficult to solve the problem.Therefore, we summarize the daily maintenance method of hydraulic power unit.Customers should pay more attention when using.