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2.1
2.1 Hydraulic
Hydraulic system
system working
working principle
principle
Lifting the Loading
Lifting the Loading
Press the lifting button of the control lever and the oil pump motor starts. It passed the torque
Press the lifting button of the control lever and the oil pump motor starts. It passed the torque
from motor to gear pump through the transmission shaft. The gear pump absorbs the hydraulic
from motor to gear pump through the transmission shaft. The gear pump absorbs the hydraulic
oil from the fuel tank and passes the oil to the lifting cylinder through non-return valve. High
oil from the fuel tank and passes the oil to the lifting cylinder through non-return valve. High
pressure oil push the piston rod forward which give rise
pressure oil push the piston rod forward which give rise to the lifting of
to the lifting of forks and the loading.
forks and the loading.
Release the lifting button and the oil pump motor stops. The gear pump stops absorbing the oil.
Release the lifting button and the oil pump motor stops. The gear pump stops absorbing the oil.
And
And the
the non-return
non-return valve
valve is
is closed
closed which
which can
can keep
keep the
the lifting
lifting cylinder
cylinder and
and the
the loading
loading in
in its
its
original lifting position. When the lifting cylinder reaches the end or the truck is over loaded, the
original lifting position. When the lifting cylinder reaches the end or the truck is over loaded, the
working pressure is exceeding the safety pressure defaulted in the system, the overflow valve
working pressure is exceeding the safety pressure defaulted in the system, the overflow valve
will be open and the
will be open and the hydraulic oil returns back to the fuel
hydraulic oil returns back to the fuel tank.
tank.
Lowering the Loading
Lowering the Loading
Press the
Press the lowering button of
lowering button of the control
the control lever and
lever and the oil
the oil pump motor
pump motor starts.
starts. When the
When the closed
closed
electromagnetic valve is applied with electricity, the hydraulic oil in the lifting cylinder will flow
electromagnetic valve is applied with electricity, the hydraulic oil in the lifting cylinder will flow
back to the fuel tank due to gravity. Both the cylinder and the loading start to lower. Governor
back to the fuel tank due to gravity. Both the cylinder and the loading start to lower. Governor
valve is used to prevent the trucks and loadings from being damaged due to the rapid lowering
valve is used to prevent the trucks and loadings from being damaged due to the rapid lowering
speed.
speed.
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