Distribution method of excavator and working principle of hydraulic pump

The working principle is that movement changes the volume of the pump cavity, thus compressing the fluid to make the fluid have pressure energy. The necessary condition is that the sealed volume of the pump cavity changes.

The transmission shaft of hydraulic pump can not bear radial force and axial force, so it is not allowed to install pulley, gear and sprocket directly at the shaft end. Usually, the drive shaft and the pump transmission shaft are connected by a coupling. If, due to manufacturing reasons, the coaxiality of the pump and the coupling exceeds the standard and the assembly is deviated, the centrifugal force will increase the deformation of the coupling with the increase of the pump speed, which will increase the centrifugal force.

Extended data:

The main function of hydraulic oil tank in hydraulic system is to store oil, dissipate heat, separate air contained in oil and eliminate foam. When selecting an oil tank, the first thing to consider is its capacity. Generally, the maximum pump flow of mobile equipment is 2 ~ 3 times, and that of fixed equipment is 3 ~ 4 times.

Secondly, consider the oil level of the fuel tank. When all hydraulic cylinders of the system are extended, the oil level of the oil tank shall not be lower than the minimum oil level, and when the hydraulic cylinders are retracted, the oil level shall not be higher than the maximum oil level. Finally, considering the structure of the oil tank, the partition in the traditional oil tank cannot precipitate dirt, so a vertical partition should be installed along the longitudinal axis of the oil tank.

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