Any hydraulic system in the use of the process will appear temperature rise, even heating problems. The temperature rise within the range is a normal phenomenon, but when it exceeds a certain range, it will cause certain harm to the hydraulic system, and even make it stop working. When the design is unreasonable to make the hydraulic system heating, how to determine and exclude.
Fuel tank design problem. The unreasonable design of the oil tank makes the heat dissipation effect of the hydraulic system decrease and the system heat up. The main function of the oil tank is to store hydraulic oil, but it also has the function of heat dissipation, precipitation of impurities and water separation. The main performance in two aspects: one is the tank volume is too small; Second, the irrational design of the tank structure, the suction pipe and the return pipe mouth are close, and there is no partition between them, which shortens the cooling cycle of the oil in the tank and the path of precipitation impurities, and even causes most of the return oil directly into the suction pipe, so that the cooling effect of the tank becomes worse and the oil temperature rises.
Elimination method: Increase the volume of the oil tank appropriately, and try to increase the distance between the suction pipe and the return pipe. A partition should be set up between the suction pipe and the return pipe to ensure the due heat dissipation power of the oil tank.
The installation position of the cooler is unreasonable and the heat dissipation rate is small. The cooling system is divided into air cooling and water cooling. Some systems need to consider the pressure requirements of the cooler, the cooler is set on the oil return circuit of the stirring system, only to cool the oil of the stirring system, and the flow rate of the stirring system is small, the cooling effect of the whole system is poor, so that the system heating.
Elimination method: one is to use an independent cooling circuit to improve the cooling effect. Second, the cooler is set on the total return circuit of the system to increase the heat dissipation flow and improve the cooling effect. However, two problems should be paid attention to at this time. The first is the speed of the cooling fan. The speed of the cooling fan should not be too low, otherwise the cooling effect will be reduced. Motor can be used to drive the fan, or set a low-pressure drive motor on the total return oil circuit, so that the motor speed and heat dissipation flow match, but also can solve the main circuit pressure impact on the bearing capacity of the cooler; The second problem is the impact of the pressure impact of the main system on the bearing capacity of the cooler if the motor is used to drive the fan. A low pressure overflow protection valve or check valve can be installed on the return oil circuit with the cooler for the highest pressure protection.
Elimination method: According to the load of the system and the normal operating temperature requirements, choose the appropriate viscosity of the hydraulic oil.
Improper selection of hydraulic components, system fever caused by concrete pump hydraulic system for high pressure large flow system commonly, if the system of hydraulic components, mainly the reversing valve, relief valve and sequence valve specification selection is not reasonable, can not meet the requirement of the heavy traffic, thus in use, high velocity, the valve port flow causes a larger pressure loss and make oil temperature rise high. Therefore, in the design of hydraulic system in the design of hydraulic components selection, must according to the hydraulic components on the maximum working pressure, the maximum flow through, and the required pressure and flow rate adjusting range components were selected; and reducing valve inlet pressure loss as far as possible, thus reducing due to unreasonable is used in the hydraulic component specification system.
Unreasonable pipeline design and installation, so that the pressure can be converted into heat energy resulting in large pressure loss. The design and installation of pipelines can not be ignored. The diameter of each pipeline should be designed strictly according to its working pressure and flow rate, so as to avoid too small diameter design, which will cause too high flow rate, too large pressure loss along the way and cause heating. At the same time, attention should also be paid to the installation of pipelines, not only to achieve neat appearance, but also to avoid pipeline agglomeration and sharp turns, affecting the natural heat dissipation of pipelines or causing excessive local pressure loss to cause heat.
