67
67
circuit
circuit
Fig6.5 Hydraulic oil
Fig6.5 Hydraulic oil
Ton
Ton
t
t
2-3
2-3 3.5
3.5
Flow,control
Flow,control
valve Q1
valve Q1
L/min
65
65
L/min
65
65
Flow,steering
Flow,steering
unit
Q2
unit
Q2
L/min
13
13
L/min
13
13
Primary
Primary
pressure,
pressure,
hydraulic
hydraulic
system P1
system P1
Mpa 17.5 19
Mpa 17.5 19
Steering
Steering
pressure P2
pressure P2
Mpa
Mpa
9
9
10.5
10.5
6.5 Lift cylinder (Fig6.6)
6.5 Lift cylinder (Fig6.6)
The lift cylinder is of
The lift cylinder is of single-action piston type. It consists of cylinder body, piston rod,
single-action piston type. It consists of cylinder body, piston rod,
piston and cylinder head etc. The bottom of the cylinder is connected with the cylinder
piston and cylinder head etc. The bottom of the cylinder is connected with the cylinder
supporter of the outer mast by bolts and pins, while its top (i.e. piston rod head) is
supporter of the outer mast by bolts and pins, while its top (i.e. piston rod head) is
connected with the upper beam of the outer
connected with the upper beam of the outer mast.
mast.
The piston, fastened to the piston rod with spring wire is fitted with oil seals and
The piston, fastened to the piston rod with spring wire is fitted with oil seals and
wearing on
wearing on its outer periphery.
its outer periphery.
At
At the
the bottom
bottom of
of the
the lift
lift cylinder
cylinder there
there is
is a
a cut-off
cut-off valve,
valve, which
which operates
operates when
when the
the
high-pressure hose bursts for any reason to prevent the load f
high-pressure hose bursts for any reason to prevent the load form dropping from abruptly.
orm dropping from abruptly.
Bushing and oil seal assembled on the cylinder head, are used for support the pi
Bushing and oil seal assembled on the cylinder head, are used for support the piston
ston
and prevent dirt from entering.
and prevent dirt from entering.
1.
1. Upper
Upper beam
beam
2. Shim
2. Shim
3.
3. Dust
Dust ring
ring
4.
4. Oil
Oil seal
seal
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