71
(1) Inner and outer mast
Inner and outer masts are all welded parts. Outer mast bottom is fixed at driving
axle with pin. The middle part of outer mast is connected with frame by tilted cylinder
and can be tilted forward and backward under the action of tilted cylinder.
Outer mast channel steel is a weldment of common low-alloy structural steel
with C-section and with its upper part being fixed with a pair of side roller.
Fig.9.2 Outer Mast
Inner mast channel steel is C-form with its outside being fixed with two pairs of
main roller and a set of side roller.
Fig.9.3 Inner Mast
(2) Space-adjusting carriage
The carriage rolls in the inner mast through main rollers. The side rollers can be
adjusted with gaskets. The vertical load shall be borne by the main rollers, while the
Side roller
Side roller
Main roller
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