Working Principle Of Hydraulic Lifting System For Dump Trucks

Hydraulic oil is formed by a vane pump to form a certain pressure, which enters the lower end of the hydraulic cylinder through an oil filter, explosion-proof electromagnetic directional valve, throttle valve, hydraulic control one-way valve, and balance valve, causing the piston of the hydraulic cylinder to move upwards and lift heavy objects. The return oil from the upper end of the hydraulic cylinder returns to the oil tank through the explosion-proof electromagnetic directional valve, and its rated pressure is adjusted through the overflow valve.
The piston of the hydraulic cylinder moves downwards (i.e. the weight is lowered). Hydraulic oil enters the upper end of the hydraulic cylinder through an explosion-proof electromagnetic directional valve, and the return oil from the lower end of the hydraulic cylinder returns to the oil tank through a balance valve, hydraulic control one-way valve, throttle valve, and explosion-proof electromagnetic directional valve.
In order to ensure stable descent of heavy objects and safe and reliable braking, a balance valve is installed on the return oil circuit to balance the circuit and maintain pressure, so that the descent speed is not affected by heavy objects. The flow rate is adjusted by the throttle valve to control the lifting speed.