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We manufacture and export DOUBLE GIRDER EOT CRANE.
DESIGN: The cranes are designed in accordance with IS-807, IS-3177 code of practice for design, manufacturing, erection & testing of structural part of the crane & IS-3177 code of practice for design of overhead traveling crane.In the design of components adequate factor of safety, as per relevant code is allowed, impact, fatigue, wear & stress concentration factors are taken wherever applicable.All drives are designed to give sound & efficient performance.
STEEL: Steel conforming to I.S. 2062 of or equivalent is used in the manufacturing of the main load bearing members.
MATERIAL & WORKMANSHIP: All material used in the crane are selected from quality material. Adequate factor of safety are used in the design of all parts subjected to stresses and shocks.
MOTORS: The hoisting, C.T. & L.T. motors will be sq. cage/slip ring type crane duty application All motors used in the crane are totally enclosed in dust proof construction with class F insulation.
GEAR BOXES: All gear boxes used in the cranes are totally enclosed in dust proof construction. The gears run in oil bath & hence no external lubrication is required. Gears & pinions are all precision machined. The shaft rotates on anti friction type ball/roller bearings. Use of totally enclosed gear box though costlier but it is desirable in view of the increased transmission efficiency & longer gear life.
BRAKES: E.H.T. type brakes are provided in the hoisting, L.T. & C.T. motion. These are automatically released when the motor circuit is on & are applied when the motor circuit is off. This features works as a positive safety device as the brakes automatically comes into operation when the power supply fails.
BEARINGS: All moving parts of the cranes are supported on anti friction type ball/roller bearings.
COUPLINGS: Geared/Pin bush couplings are provided between all gear boxes & motors.
LUBRICATIONS: The crane is provided with necessary lubrication fittings to facilitate maintenance.
OPERATION: Pendent push button station is suspended from one end of the bridge at a suitable height from the floor level with step down voltage of 110V. Limit switches are provided on all motions to prevent over traveling.
POWER SUPPLY: The crane is suitable for operation of 440 V + 6% volts, 3 Phase, 50 Cycles, A.C. Supply.
CRAB FRAME: The frame work is of all welded construction, fabricated from rolled steel section & plates. The hoist & cross travel mechanism mounted on this frame.
HOIST MACHINERY: Hoist mechanism consists of motor, brake, gear box, rope drum & bottom block.
ROPE DRUM: The rope drum is of mild steel fabricated construction having right & left hand spiral grooves machined to suit the hoisting ropes. The drum is of such that there is not more than one layer when rope is full wound also length of the drum is such that each lead of drum when hook is its lowest position & one spare grooves for each rope lead when the hook its highest position.
WIRE ROPE: Wire rope is of best plough steel, fibre core normally in 6x36 construction having tensile strength of 160/175 kgs./sq.m [1570 N/sq.mm]. The wire rope has a factor of safety in accordance with IS-3177 depending on the class of the duty of the crane. The make of wire rope will be Usha Martin.
BOTTOM BLOCK: The hook is of single plain shank type conforming to I.S. 3815 & made of forged steel or equivalent supported on thrust bearings.
ROPE SHEAVES: These are C.I. running on bearings, adequate guards are provided to prevent the rope from leaving the sheaves.
LIMIT SWITCHES: One number shunt type geared limit switch of reputed make is provided to prevent the over lowering & over hoisting.
CROSS TRAVEL MACHINERY: Cross travel machinery consists of motor, totally enclosed dust proof gear box, brake etc.
BRIDGE GIRDERS: The girders are of plate welded BOX type construction designed to sustain all stresses arising due to vertical lateral forces with impact to which they are subjected. The maximum deflection of the main girder is limited to 1/900th span of live load including the weight of the trolley.
TROLLEY TRACK: Suitable square steel section tracks are provided for travel of the trolley. These are welded on the girders.
WHEELS: The wheel of the trolley & the end carriages shall be forged steel conforming to IS-2707 Gr.II duly spin hardened to 300 BHN material. Double flanged straight tread type fitted with anti-friction bearings for the ease of maintenance.
END STOPPERS FOR CROSS TRAVEL TROLLEY: End stoppers are provided on either side of the bridge to limit the motion of the trolley.
PLATFORM: M.S. chequered plate / anti skid plate platform shall be provided for full length on one side of the bridge girder.
END CARRIAGES: End carriages are fabricated from rolled steel section/plate with adequate diapharms & stiffeners to give a rigid construction. The girders with gusset plates are set on the end carriages & joined with bolt in rimmed holes. Rubber buffers are provided on either side of the end carriages.
LONG TRAVEL MECHANISM: The driving machinery for the long travel motion is twin motor drive. This comprises motor, totally enclosed gear box, brake coupled with wheel shaft together for two end carriages separately.
CONTROL PANEL: The protective panel consists of contactors, overload relay, fuses, transformers etc.
PAINTINGS: The structural parts of the cranes are thoroughly cleaned and are applied one coat of red oxide & two coats of enamel paints before dispatch.
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