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※ Derricking gear of Tower Crane WJL120 Type
 
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Derricking gear of Tower Crane WJL120 Type
Introduction：
I Performance
Derricking gear is drive device to finish level function of loading dolly of tower crane, it is divided into gear worm speed reducer and planet-gear drive speed reducer. Gear worm speed reducer has simple and close structure, can be installed at the end of gib arm of tower crane with reasonable price, economical and practical performance. Planet-gear drive speed reducer adopts planet drive principle with close structure, small volume, light weight, low noise, stable running and long service life.

II Principle Specs and Technical Parameter
Performance parameter/Model
WJL120
Motor
Model
YD112M-4/8
Rotate Speed (r/min)
1440
720
Power (Kw)
2.4
1.5
 Brake Moment (N.m)
Speed Reducer
Model
WJL120
Speed Radio
38
Drum
Diameter (mm)
360
Diameter of rim (mm)
400
Length of Rope Roll (mm)
401
Cope Capacity (m)
Rope pitch (mm)
9
Overall Dimension
Length (mm)
Width (mm)
371
 Height (mm)
356
Height of center (mm)
155
Space between brackets (mm)
　

III Structure of Machinery and Installed Dimension
Derricking gear of WJL120 Speed Ratio：i＝38
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