BRIDGE GIRDERS:

Double Girder EOT CRANE

The bridge girders are fabricated from high quality steel plates forming a rectangular box section. Stiffening diaphragms are fitted at regular intervals for the design to conform to IS-807 and IS-800. The girders are so built that they have the required camber in the unloaded conditions as required under Indian Standard Specifications. The Internal surfaces are adequately sealed from the atmosphere by welding thus preventing internal corrosion.

END CARRIAGES:

The end carriages are fabricated from M.S. plates and provided with necessary diaphragm members. These are connected to the girders using only machined bolts.

A tapered plate design is incorporated for joining the end carriages to the girders thereby ensuring smooth flow of stresses. This design is ideally suited for cranes which are constantly subjected to dynamic loading.


The end carriages are provided with forged steel wheels carried on specially designed bearing support blocks of `L’ type design (commonly known as `L’ type bearing Housing).

The trolley frame is fabricated from M.S. plates/Rolled sections welded together to form robust construction to carry the hoisting and traversing machineries. The trolley frame is also carried on four forged steel wheels provided in `L’ type of bearing support blocks.

One full length platform of chequered/M.S. anti-skid plates is provided on the drive end side of the bridge girders. Platform on other side can be provided at optional extra cost.

For easy assembly/erection at site all parts of crane structure is match marked.

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.

CONTROLLING EQUIPMENT:

The floor controlled crane will be controlled by means of pendant push button controller operated from floor. The Cabin controlled crane will be controlled by means of master controllers or Drum/Cam type controller.

RESISTORS:

In case of slip ring motors, resistors shall be provided are designed as per BSS-587-1957 and are made of unbreakable grids formed from stainless steel or a similar alloy housed in a ventilated steel housing. These are suitable for intermittent duty having 5/10 minutes rating.

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.

WIRING:

All wiring between individual motors, controllers, current collectors and resistance is with PVC flexible/un-armored cables. Control wiring is done with PVC flexible/un-armored cables having copper conductors.

TESTING:

The cranes are fully assembles in our workshop before dispatch as per ISS-3177. The testing of hoisting and C.T. motion are carried out at our works at load conditions & overload as per IS:3177 prior to dispatch including the deflection test in presence of third party inspector with handing over of necessary certificates.
 

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