Gantry Crane2018-01-10T18:15:59+00:00

Gantry Crane

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Description:

At Krishna, we are Gantry/goliath Crane Manufacturer, Supplier and exporter who work with unparalleled technology to provide the best products. With flexible and dynamic designs, our cranes come with a staunch moving ability and can carry heavy goods from one place to another with utmost convenience.

The complete crane design is made in strict accordance with the standards of IS 3938 and IS 807 to ensure quality and perfection. These robust cranes have a lifting and loading capacity of 5 ton to 25 ton. They lifting heights of these cranes are flexible and can be customised according to client needs.

Types of Gantry Cranes:

Fixed height crane:

It is also known as the Full Gantry Crane. The peculiarity of these cranes is that they don’t have a flexible height. They come with a given fixed height and would function at that level only. The available heights are 20, 40, 60, 80 and 100 Feet.

Adjustable height:

Unlike fixed cranes, the height can be adjusted according to requirement in these cranes. They come with pre-installed grooves which provide the option of changing the height. They are available for 5, 10, 15, 20 Feet.

Single girder:

Single girder cranes are used in the work units where heavy loads need to be lifted. They are available in the heights of 20, 40, 60, 80 and 100 Feet.

Double girder:

In massive industries and workstations, extremely heavy loads need to be lifted which cannot be supported by one beam. In such cases, these cranes with two beams are used. They are available in the height options of 20, 40, 60, 80 and 100 Feet.

Rail mounted:

In work stations like shipyards, steelyards, etc., load needs to be carried from one place to another. Rail mounted cranes come handy in such places. They are available in the heights of 20, 40, 60, 80 and 100 Feet.

Cantilever gantry crane:

These cranes come with a girder that can run seamlessly on crossways. The height options available for them are 20, 40, 60, 80 and 100 Feet.

Semi Gantry/Portable Crane:

Some cranes come with a unique design which has half a part of an overhead crane and half a part of a motorised crane together in one. They are known as Semi Gantry Cranes. The height options for them are 20, 40, 60, 80 and 100 Feet.

Design Parts of the Gantry 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 & stresses concentration factors are taken wherever applicable.

Steel

The steel used for manufacturing the main load bearing parts of the crane is only the one according to the I.S. 2062 standards.

Material & Workmanship

Only high-quality material is used for manufacturing this cranes in a design that factors in numerous holistic safety measures.

Motors

The main hoisting motors are the L.T. and C.T. In order to provide them with all-round protection, we enclose them in a dust proof system of TEFC / TESC CLASS ‘F’ 40% CDF insulation.

Gearboxes

Every single gear box of the crane is protected in a dust proof system. The system is designed in a way that the gear provides automatic lubrication from the bath itself. The pinions and gears are made only using the EN-9 forged/ rolled steel. They are also linked to the carbon steel shaft intricately. Antifriction ball bearings support the rotation of the shaft. In order to boost the efficiency of the system, we keep the gearbox completely covered.

Brakes

For hoisting, we provide the E.H.T./ E.M. type brakes. These brakes perform appropriate functioning automatically according to the situation of the motor circuit. This feature comes very handy in the case of power supply fails as well.

Bearings

We use only antifriction ball bearings to support all the moving parts of the crane.

Couplings

Flexible geared couplings of the universal types between the motors and the gearboxes.

Lubrications

The cranes are supplied with appropriate lubricants which boost efficiency.

Operation

According to the client needs, the crane can be floor or cabin operated.

Power Supply

These cranes work ideally on 415 V + 6% volts, 3 Phase, 50 Cycles, A.C. Supply.

Hoist Machinery

The hoist machinery includes a motor, brakes, a gearbox, a rope drum as well as a bottom block.

Rope Drum

The hoist machinery includes a motor, brakes, a gearbox, a rope drum as well as a bottom block.

Wire Rope

Made using mild steel, the drums have spiral grooves on both its sides to facilitate the hoisting ropes. The design of the drums is made in a way which only allows one rope layer to cover the drum.

Bottom Block

One plain shank type hook which is made according to the I.S. 3815 standards is used to support the thrust bearings.

Rope Sheaves

The rope sheaves run on bearings. They are guarded in a way which prevents them from leaving the sheaves.

Limit Switches

Limit switches restrict the motion and prevent the possibilities of over hoisting or over lowering.

Cross Travel Machinery

The cross-travel machinery includes a gearbox with a dust-proof covering, brakes, etc.

Wheels

The wheels are fabricated using the IS-2707 steel which is hardened to 300 BHN material.

Bridge Girders

We use plate welded box type girders and design it in a way that helps them withstand severe pressures and stresses. Plus, we have also restricted the girder deflection to a maximum of 1/900th span of live load.

Trolley Track

Various square-shaped steel sections are used for the trolley design. They are firmly welded on the body of the girders.

End Stoppers for Cross Travel Trolley

In order to restrict the trolley motion safely, we have provided the cranes with steel end stoppers.

Platform

e provide anti-skid platforms along either side of the girder length if it is in the client requirements.

End Carriages

The end carriages are made using rolled steel sections along-with stiffeners and diaphragms that provide a solid and robust construction.

Long Travel Mechanism

The long travel mechanism if either of the single motor drive type of the twine motor drive type.

Twin Drive Motor Arrangement

Various independent units of the driving machinery like gearbox, brake, etc. are linked together in this type of arrangement on one of the sides of the end platform. The gearbox used is of the helical type.

Paintings

We paint all the structural parts of the crane using one layer of red oxide paint and two layers of enamel paints.

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.