CONSTRUCTIONAL FEATURES :

HAFA Conical rotor electric wire rope hoists are manufactured in compliance to Class II duty  of  IS 3938 / 1983.
The failsafe conical brake, which does not require any brake coil or electric circuitry  makes these hoists most reliable, robust and ideal for heavy duty applications.

1.    MOTOR :-   The motor used in HAFA hoist is a conical rotor construction, 3 phase Squirrel Cage induction
       type.  The motor is specially designed for Hoist  & Crane duty.  It has class 'F' insulation and the starting and   
       stalling torques of this motor is 220 %  and 290 % respectively  of the full load torque.  The motor is rated
       at 40 % CDF.

2.    BRAKE :-   Motors of conical rotor construction have an axial movement of the rotor, when started.  The   
      characteristic is taken advantage of in actuation of brake. When  the motor is started, the rotor is pulled
      axially into the magnetic center of the stator field and  the conical brake mounted on the rotor shaft, thus gets 
      released.  If the motor is put off or the power should fail, the rotor is moved back axially by the spring provided
      in the spring housing, and the brake is applied.  The braking torque is 100 % above the motor torque at rated 
      load.  This  safe and simple braking arrangement which does not require additional coil or electric  circuitry
      has  proved itself to be very reliable and foolproof, and  it needs very little or almost no maintenance.

3.    GEAR BOX :-    The gear box is made of  High grade Cast Iron.  The precision  spur gears are machined from 
       alloy steel, and gear box is greased filled, Ball / needle roller bearings are used to mount the gears.

4.    ROPE DRUM  :-   The rope drum is rolled & fabricated from tested quality plates and machined accurately.
       It is driven through an internal gear ring and is supported by large diameter roller bearing at both ends.   
       Machined rope  grooves and drum diameter confirming is IS 3938 ensures the best possible
       working conditions for the rope. 

5.    ROPE GUIDE :-   The rope guide is made of S. G. iron castings base and is accurately machined to suit the 
       grooves of the rope drum.  This rope guide  moves on the rope drum like a nut on the screw and prevents the 
       rope from overriding and loosening.  It also operates the limit switches provided in the
       hoist to limit the over hoisting  and over lowering  of the hook.  The rope tighter
       moving along the rope guide ensures proper tensioning of the rope.

6.    MAIN BEARING HOUSING PLATES :-   All part of the hoist unit are mounted on bearing housing, plates thus 
       forming an  integral unit.

7.    CONTROL :-    The hoist is controlled by a pendant push button station.
       Supply to the pendant push button is  of 110 volts as per IS specifications.

8.    MICRO-SPEED :-     All hoists can be fitted with a separate  micro-speed motor, giving an additional lifting 
       speeds of 1/14th, 1/10th,  or 1/7th of  normal speeds independent  of load.