The invention provides an auxiliary lifting
system of a dump
truck. The auxiliary lifting
system is connected with a main lifting
system in parallel. The auxiliary lifting system comprises an oil-inlet one-way valve, an oil-outlet one-way valve, an electric
oil pump, a lifting oil cylinder, a controller, a
control switch, and a packing box displacement sensor. When the
control switch is started, the controller controls the electric
oil pump to start pressurizing; the lifting oil cylinder extends and pushes a packing box of the dump
truck to start lifting; when the packing box displacement sensor detects that the lifting height achieves a preset height value, the electric
oil pump stops pressurizing; and after a closing command from the
control switch is received, the electric oil pump starts releasing pressure, the lifting oil cylinder is contracted, the packing box of the dump
truck falls, and when the packing box displacement sensor detects that the falling height of the packing box achieves a preset value, the electric oil pump stops releasing pressure. According to the auxiliary lifting system disclosed by the invention, the lifting and the falling of the packing box can be controlled through the control switch when the situation that the dump truck needs refueling is detected, so that a driver completes a refueling process smoothly; and the auxiliary lifting device can also be automatically lifted when the packing box of the dump truck lifts, so that a second packing box anti-falling support is formed based on an original packing box anti-falling support of the dump truck, and when a
chassis of the dump truck is maintained, the safety is improved.