HI-TECH Hoist are manufactured keeping in mind of High Quality, Minimum maintenance, very compact and Elegant appearance. HI-TECH hoists are designed keeping in mind Indian Standard Specifications applicable to the hoists IS-3938.
 

This comprises of a motor of sufficient power, a totally enclosed helical gear box, a rope drum coupled to the gear box by a specially designed flexible geared coupling.

The motor is directly coupled to the gear box and on the coupling an electro- magnetic/electro hydraulic thruster brake is provided which comes into operation as soon as the power is switched off (i.e. fail to safe type operation).

Flame Proof HOIST

The gear box is having casting body incorporating all machine/hob cut helical gear trains and is splash lubricated. The use of totally enclosed helical gear boxes though rather expensive more than justifies the extra price in view of the advantages of high transmission efficiency, less meshing noise and longer life.

The gear box is coupled to an M.S. fabricated/seamless pipe rope drum. The rope drum is finally machined to have right and left hand spiral grooves to take the hoisting rope. It is of such a size that there will not be more than one layer of rope on the drum when the rope is fully wound. Also the length of the drum will be such that each lead of rope will have minimum two turns on the drum when the hook is at the lowest position and one spare groove for each rope lead when the hook is at the highest position.

A steel snatch block, complete with forged steel hook carried on bell thrust bearing is provided. It is provided with cast iron or fabricated M.S. pulleys and is fitted with guards to prevent the rope from leaving the pulleys. Lifting Hook is tested as per IS 3815 and IDLR test certificate is issued for each hook.

The hoisting wire rope provided is of 6 x 36 construction of best plough steel having a breaking strength of 160/175 kg/mm2 The wire rope has factor of safety as stipulated in IS 3177-1977. A Spindle limit switch driven by hoisting drum shaft is provided to give protection against the extreme positions of hook travel.


TRAVERSE MOTION:

The traverse motion involves power transmission from the motor to the trolley wheels through enclosed vertically mounted spur/helical gear box having an output shaft extending on both sides the trolley wheels through semi-geared couplings on the principle of floating shaft. The motor coupled to the gear box and on the electromagnetic/electro hydraulic thruster provided. The brake applies automatically when the current supply is switched off.

TRAVEL MOTION:

Two independent driving units are provided at the end of bridge girder. Each unit comprised of a motor driving, the bridge wheel through a totally helical gear box. The motor is coupled to the gear box and on the coupling an electromagnetic/hydraulic thruster brake is provided which applies automatically when the power is switched off.
Gear box shaft extends on one side and drives wheel on the principle of the floating shaft semi-geared couplings. This system, of providing a semi-geared and semi-rigid coupling in the traverse and transmission shafting, is known as the floating system. The entire transmission system on the output shafts of traverse and travels motions is assembling with the use of geared coupling.

MOTORS:

All motors will be totally enclosed 40% CDF high torque crane duty squirrel cage / slip ring type preferably in TEFC frame size. Motors will have generally Class F insulation suitable for tropical climate & high humidity. All motors will confirm to IS: 325. The motors will confirm to details as given in quotations.

CONTROL PANEL:

An electrical protective panel of sheet metal is provided housing with Isolating Switch, overload relays for hoisting, one contactor type circuit breaker, one set of fuses for each motor & one transformer for low voltage supply.

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