Single Girder EOT Crane2018-01-10T18:18:31+00:00

Single Girder EOT Crane

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Description:

At Krishna, the underslung cranes are made with a modular design using staunch with quality wire rope hoists. These cranes are quite similar to the travelling cranes with an overhead design. However, unlike them, these cranes run on bottom flange of I beam which and crane end carriages runs on that . If required, we can also equip the cranes with over hung on one or the both sides.

The main component of the crane include a bridge girder which is lined to 2 end carriages with wheels that are run by motor gearbox units. Customized independent push stations / RRC / VFD featured can also be provided. We use the festoon cable system to supply power to the cranes.

Technical Description:

Ware house, Iron and steel, hydro-power, Power Stations, wind power sectors, paper, Chemical, engineering, automotive, Railways, Shipbuilding, rolling mills and many other types of industries, Coal Mines, Petro Chemicals & Chemicals, Oil, Mines & Rigs, Fertilizers, Solvent extraction plants, Paints & Varnish, Industry, LPG Bottling plants, Agro Chemicals, Drugs & Pharmaceuticals, General Industry.

Design Parts of the Single Girder EOT Cranes

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 & stresses concentration factors are taken wherever applicable.

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 main hoisting L.T. & C.T. are totally enclosed in dust proof construction either TEFC / TESC CLASS ‘F’ 40% CDF insulation of reputed make.

Gearboxes

All gear boxes used in the cranes are totally enclosed in dust proof construction. The gears run in all bath & hence, no external lubrication is required. Pinions are of EN-19 & gears are of EN-9 forged/rolled steel & are keyed to carbon steel shaft. Gears & pinions are all precision machined. The shaft rotate on antifriction 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./E.M. 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 is 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 antifriction type ball/roller bearings.

Couplings

Flexible/Universal/Geared coupling are provided between all gear boxes & motors.

Lubrications

The cranes is provided with necessary lubrication fittings to facilities maintenance.

Operation

The cranes are either floor operated or cabin operated as required by client for floor operated crane pendent. Push button station is suspended from one end of bridge at suitable height from the floor level with step down voltage of 110 V.

Power Supply

The crane is suitable for operation of 415 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 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, fiber core normally in 6x36 construction having tensile strength of 160/175kgs./sq.mm [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

Its are C.I. running on bearing, adequate guards are provided to prevent the rope from leaving the sheaves.

Limit Switches

Limit switches are provided of reputed make to prevent the rope the over lowering & hoisting.

Cross Travel Machinery

Cross travel machinery consists of motor totally enclosed dust proof gear box, brake etc.

Wheels

The wheel of the trolley & the end carriage shall be forged steel conforming to IS-2707Grill duly spin hardened to 300BHN material. Double flanged L type straight tread type fitted with antifriction bearings for ease of the maintenance.

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.

End Stoppers for Cross Travel Trolley

Steel end stoppers are provided on either side of the bridge to limit the motion of the trolley.

Platform

M.S. chequered plate / anti skid platform shall be provided for full length of one side of the bridge girder ( If required by client ).

End Carriages

End carriages are fabricated from rolled steel section/plate with adeaclate diaphragms & stiffeners to give a rigid construction. The girders with gusset plates are set on the end carriages & joined with bolt in rimmed holes wooden / rubber buffers are provided on either side crane and carriages.

Long Travel Mechanism

The driving machinery for the long travel motion is either single motor drive or twine motor drive.

Twin Drive Motor Arrangement

In this case, independent driving units comprising of motor gear box, brake etc. are coupled together & are mounted at either end platform. We are using our helical gear box for L.T. drive arrangement.

Paintings

In this case, independent driving units comprising of motor gear box, brake etc. are coupled together & are mounted at either end platform. We are using our helical gear box for L.T. drive arrangement.

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 & stresses concentration factors are taken wherever applicable.

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 main hoisting L.T. & C.T. are totally enclosed in dust proof construction either TEFC / TESC CLASS ‘F’ 40% CDF insulation of reputed make.

Gearboxes

All gear boxes used in the cranes are totally enclosed in dust proof construction. The gears run in all bath & hence, no external lubrication is required. Pinions are of EN-19 & gears are of EN-9 forged/rolled steel & are keyed to carbon steel shaft. Gears & pinions are all precision machined. The shaft rotate on antifriction 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./E.M. 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 is 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 antifriction type ball/roller bearings.

Couplings

Flexible/Universal/Geared coupling are provided between all gear boxes & motors.

Lubrications

The cranes is provided with necessary lubrication fittings to facilities maintenance.

Operation

The cranes are either floor operated or cabin operated as required by client for floor operated crane pendent. Push button station is suspended from one end of bridge at suitable height from the floor level with step down voltage of 110 V.

Power Supply

The crane is suitable for operation of 415 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 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, fiber core normally in 6x36 construction having tensile strength of 160/175kgs./sq.mm [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

Its are C.I. running on bearing, adequate guards are provided to prevent the rope from leaving the sheaves.

Limit Switches

Limit switches are provided of reputed make to prevent the rope the over lowering & hoisting.

Cross Travel Machinery

Cross travel machinery consists of motor totally enclosed dust proof gear box, brake etc.

Wheels

The wheel of the trolley & the end carriage shall be forged steel conforming to IS-2707Grill duly spin hardened to 300BHN material. Double flanged L type straight tread type fitted with antifriction bearings for ease of the maintenance.

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.

End Stoppers for Cross Travel Trolley

Steel end stoppers are provided on either side of the bridge to limit the motion of the trolley.

Platform

M.S. chequered plate / anti skid platform shall be provided for full length of one side of the bridge girder ( If required by client ).

End Carriages

End carriages are fabricated from rolled steel section/plate with adeaclate diaphragms & stiffeners to give a rigid construction. The girders with gusset plates are set on the end carriages & joined with bolt in rimmed holes wooden / rubber buffers are provided on either side crane and carriages.

Long Travel Mechanism

The driving machinery for the long travel motion is either single motor drive or twine motor drive.

Twin Drive Motor Arrangement

In this case, independent driving units comprising of motor gear box, brake etc. are coupled together & are mounted at either end platform. We are using our helical gear box for L.T. drive arrangement.

Paintings

In this case, independent driving units comprising of motor gear box, brake etc. are coupled together & are mounted at either end platform. We are using our helical gear box for L.T. drive arrangement.

Tags : Over Head Cranes, EOT Cranes, Single Girder EOT Cranes, Single Beam Cranes, Single Girder Overhead Crane, Single Girder electric Crane, Single Girder Top Running Crane, Single Bridge Crane.