Industrial Cranes

The cranes are designed, manufactured, erected and tested generally in accordance

i) IS: 3177-1999 (latest) - Indian Standard Code of Practice for electric overhead traveling cranes.

(ii) IS: 807-1976 (or latest) - Indian Standard Code of Practice for design, manufacture,

Erection and testing (structural portion) of cranes and hoists.

(iii) IS: 3938-1979 (or latest)-Indian Standard specification for Electric wire rope hoists (SG).

iv) IS: 800 -1984 (or latest) – Indian Standard code of practice for General Construction in steel.

The design of the crane structure as well as all the component parts of the crane

Mechanism conform to class of duty indicated in Schedule-I. The class of duty is based on design parameters stipulated in IS: 807-1976 (or latest). The stipulations in these specifications are complementary to those set out in the Indian Standards Specifications - 3177, 807 & 3938 mentioned above.

RIGIDITY CONTROL SAFETY

The cranes we build are rigid, robust and of sturdy construction with crane controls conveniently located and interlocked to prevent accidental movement of the crane.

Suitable limit switches, one each for long and cross travel and two each for main and

Auxiliary hoists are provided to stop the crane and prevent over-travel of various moving parts of the crane.

A speed sensing switch set for 1.5 times the maximum lowering speeds is fitted along with a separate brake caliper disc type on the main hoist drum, in order to cater to the unlikely eventuality but fatal should it occur, of the load falling due to a mishap beyond the motor output shaft on which the regular hoist brake is fitted. This would be required only in especially critical cases, such as cranes carrying molten metal, where additional safety is to build into the crane apart from the twin hoist brakes.

Suitable buffers are provided to prevent over travel of the crane mechanism in both longitudinal and cross traverse directions.

A safety hand railing of tubular construction are provided on bridge foot walks, end carriages, staircases, the landing in the cabin, trolley and any other places where access has been provided.

Sheaves are provided with rigid guards to retain the wire ropes in the grooves. The guards fit close to the flange having a clearance not more than one-fourth of the diameter of the wire rope between the sheave and the inside of the guard. Bottom block sheaves are enclosed except for wire rope openings.

The fully commissioned crane is rigid and robust to withstand the workshop environment with an ambient temperature ranging up to 500 C and relative humidity of 100 %.

the period of guarante