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9.1 General Description
The hoist system is adopted the two-stage, rolling telescopic mast type. The inner
mast and outer mast frame have C-shape section of CPCD140, CPCD150, CPCD160.
9.2 Outer & Inner Mast
The inner mast make up of top beam assembly, left section steel and right section
steel, roll shaft, crossbeam etc. The outer mast make up of left section steel and right
section, crossbeam, sustain plank, mounting bracket of lift cylinder etc. Connect the
left section steel and the right section steel with top beam and cross beam, the bracket
of outer mast connected with frame by pins, outer mast have tilt cylinder bracket, the
front end of the tilt cylinder is installed in the bracket by pins. The mast is tilted by
operation of the tilt cylinders；forward 6°, backward 12°；forward 5°, backward
10°；forward 6°, backward 6°；forward 3°, backward 6°.End rollers and side
rollers of outer & inner mast’s maintenance belong to perch maintenance, so that
notice safety.
9.3 Lift Bracket
At the lift brackets welded roll shaft, end rollers that roll along the inside of the
inner mast frames are installed on the end roller shafts with snap rings. The side
rollers that roll along on the inside of the inner mast frames are bolted, being adjusted
by shims. Forks or side suspenders installed on the support shaft. The two forks
installed on the beam of the lift bracket are made of special alloy steel which has been
subjected to heat treatment.
9.4 Adjustment of Hoist System
(1) Make the forks or suspenders to descend to the ground，adjust the lift chain to
assure the distance of the center line of lower rollers on the lift bracket is equal to the
bottom line of inner mast.
(2) Make the mast assembly tilt backward，adjust the pulling force of lift chains and
let the strain of each lift chain be equal.
(3) Travelling distance of two lift cylinders should be equal. Travelling distance may
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