Single Girder Gantry Crane

Single girder gantry crane with hoist

Technical features

It is a folded and electrically welded iron plate box with a rectangular section. The main girder is linked to the legs of the gantry i.e. to the headers.

At the beam extremity, to delimit the wider excursion and to absorb safely eventual collision with the travelling trolley, the fixed clasps contrasting the high absorption capacity elastic rubber bumpers are placed. These are placed on the trolley or directly on the clasps.

The wheels, rolling on pins, are assembled with a conical bearings equipped with an adjustment and lubrication system. The adopted transmission system is “direct” type where the motive wheels get the motion from a self-braking motor reducer fixed directly without external gear.

The reducer, lubricated with an oil bath, is an orthogonal types with cylindrical and bevel gears, with heat treated helicoidal gear teeth.

The electric motor, is a self-braking type with a short circuit rotor.

It travels under the girder of the crane. Four forged steel wheels warrant the motion of the trolley.

Two of them are motive, they all have double flanges and roll on bearings. Self-braking motor reducer with the same characteristic drives the two motive wheels.

The trolley is equipped with stirrups to prevent falls and derailments and have electric limit switch to delimit the transversal motion.

Gli elementi più importanti che lo costituiscono sono:

  • Reducer: mechanical cast iron or steel box, with gears made of heat treated allied steel. The shafts are assembled on bearings and the rectified teeth.
  • Lubrication: is warranted by the beating of the oil contained in the chest of the reducer.

  • Rope winding drum: made of laminated steel tube with machined helicoidal grooves. It is motioned by the slow shaft of the reducer and on the opposite side it is supported by self-aligning roller bearing.

  • Electric motor: at high couple and low absorption at pickup.

  • Lift limit switch: it is a worm type, motioned by the drum. It guarantees the stop at the maximum and minimum range of the hook. It is activated directly by the slow shaft of the drum.

  • Lift rope: high flexibility formation and high resistance to wear.

  • Lift hook: it turns on a thrust bearing and assembled, with a yoke, on the block with return pulleys.

  • Limiting device: placed on the extremity of the rope; it intervene in case of overload.

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Single Girder Gantry Crane

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