FAQ >> Single Girder Overhead Cranes and Double Girder Overhead Cranes

Single Girder Overhead Cranes and Double Girder Overhead Cranes

Single Girder Overhead Cranes

Capacity Range

0.5 tonne to 20 tonnes

Span Range

3 meters to 30 meters

Description of single girder overhead cranes

Single girder dual motor cranes provide greater floor coverage than other type cranes. The close crane end approaches coupled with a close trolley approach hoist give you more working floor coverage This can reduce space requirements in new buildings, or expand your usable space in existing buildings.

  • Adjustable torque magnetic disc/shoe brake for smooth operation.
  • Forged steel crane wheels for long life.
  • Top quality hoists matched to the duty required.
  • Electric hoist conforms to IS : 3938.

Double Girder Overhead Cranes

Capacity Range

1.0 tonne to 150 tonnes

Span Range

3 meters to 36 meter

Types of Double Girder Overhead Cranes

  • Class I : Light duty cranes for repair shops, light assembly operations, service buildings, light warehouses, where service requirements ate infrequent.
  • Class II : Medium duty cranes for machine shops and general industrial use both indoor and outdoor application.
  • Class III : Extra heavy duty cranes for steel mills and other heavy machine shops, steel warehouses, heavy fabrication shops, paper mills etc. with magnet and bucket operation for scrap yards, fertilizer plants and induction furnace.
  • Class IV : Extra heavy duty cranes for steel mills and other heavy engineering purposes.

Features of Double Girder Overhead Cranes

  • Structure : Bridge girder, end carriages, crab frame manufactured from box plate design/ Rolled Sections. If required 100% radiography of all but welding joints of bridge and end carriages can be provided. The material of construction conforms to IS:2062, and the bridge is designed for minimum vibration.
  • Wheel Assemblies : Trolley and crane wheels are straight treaded double flanged forged steel C55Mn75, heat treated to achieve a special sorbatized structure upto a depth of 15-20 mm from the surface and gradually diminishing towards the centre retaining the core properties. These wheels arc supported on antifriction ball/roller bearings, in special L-type bearing blocks. Wheels also available of gear and pinion type.
  • Gearing : The year reducers am constructed either in double, triple and quadruple reduction using rugged wide faced helical and spur gears that am precision cut from special alloy steel forgings. And to protect the gear train from shock loads, all gears and pinions are supported between two anufricuon ball/roller bearings. All gear units arc totally enclosed with oil bath splash lubrication.
  • Micro drive special gear boxes-The special micro drive provides fine inching movements of hoist, trolley or crane at the rate of 5% to 20% of the main speed. The micro drive is achieved by a separate gearbox, with unique sun and planet system. Gearing system fitted on the input side of main gear unit and pony motor with separate brake unit. It is a positive drive and avoids the use of clutches etc.
  • Cranes Drives : A.C. control packages to meet electrical requirements.
  • Variable Frequency Drives and Remote Controls : Variable Frequency Drive in hoisting, cross travel, long travel for stcpless speed control can be implemented. also cranes with radio remote control cranes for application in inaccssible and hazardrous areas.
  • Brakes : Failsafe magnetic or hydraulic brakes of 150% torque or more are fitted on shaft extensions. For heavy duty cranes a second brake can be mounted to ensure failsafe operation.
  • Controls : Pendant control from floor, master control switches, master controllers in the driver's cabin can be provided.
  • Cabin : Open or enclosed type drivers cabin available The cabins can be provided either at one end of the bridge girder or center of bridge girder. Moving type cabin fitted with crab can also be provided. Enclosed cabin is well ventilated but air conditioned cabin can also be provided. Standard cabin accessories are operating switches, protective panel, and safe ladder from platform. Drivers scat, exhaust fan, insulated floor matting, fire extinguishers are provided on request.

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