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#  D25A:  Derrick Cranes


This machine is heavy duty marble block handling machine at quarry/mines.

Itís Structure i.e. Boom, Central Mast and Rafters are made by heavy duty structural steel frame.

The Central Mast base is fixed to the hoist unit. This Hoist unit consists of special crane duty motor, connected to variable speed reducers and helical gear box, coupled to a grooved steel drum. Hydro-thruster brakes control the smooth lifting of weight. The hoist unit rotates on specially designed thrust bearing by means of multiple step down gears, fitted into the Hoist Foot. The hook block is equipped with a forged steel forked revolving hook.

Electric operations are controlled with push button control unit, which independent from the position of hoist unit. Limit switches are provided to ensure accident free operations in boom lifting and & load lowering and revolving. 





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