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2.1 Hydraulic system working principle
– Press the lifting button on the control box to start the oil pump motor and transmit torque
from the motor to the gear pump through the transmission shaft. The gear pumpsucks
hydraulic oil out of the oil tank and enters the lifting cylinder through a one-way valve. High
pressure oil drives the piston rod to move, thereby driving the fork and loadup.
– Press the lowering button, the oil pump motor stops running, the gear pump stops suction,
and the one-way valve closed, thus keeping the lifting cylinder and load in the lifting position
unchanged.
– When the lifting cylinder piston reaches the end position or the vehicle is overloaded, the
pressure will exceed the safety pressure set by the relief valve. At this time, the relief valve
opens and hydraulic oil flows back to the tank.
– When the lowering button on the control box is pressed, the normally closed
electromagnetic directional valve is energized and the return oil channel is opened. The
hydraulic oil in the lifting cylinder flows back to the oil tank through the electromagnetic
directional valve and speed limit valve under gravity, causing the cylinder to lower and the load
to decrease.
– The speed limit valve is designed to prevent the load from dropping too quickly, causing
danger such as damage to the vehicle or load.
Lifting cylinder
Pressure switch normally
closed type
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