Electric overhead crane is the material lifting equipment that installed over workshop, warehouse and stockyard. People also call it bridge crane because its end beam on both sides locates on tall concrete column or steel support, which makes it seemed like a bridge. Crane span structure of overhead cranes lays on the elevated track, and both sides run together to carry loads in a longitudinal direction. This kind of crane design makes the whole crane makes full use of space under crane structure to get rid of the limit of ground equipment. Overhead cranes are the most widely used and largest quantity hoisting machinery.

Electric crane has hoisting trolley walking on its surface or hanging hook to transport loads. Overhead crane has single girder crane and double girder overhead crane two types, their differences mainly lie in how crane trolley walks along crane girder, their rated capacity and their working classes. The following introduction has brief describe of each model of girder overhead crane.



AQ-HD Electric Overhead Crane Lifting capacity: 1-20t

Span:7.5-28.5m

Lifting height:6-18m

Lifting speed: 0.8/5m/min

Hoist travelling speed:2-20m/min

Crane speed: 3-30m/min

Duty: A5

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AQ-LD Electric Overhead Crane Lifting capacity: 1-25t

Span length: 7.5-31.5m

Lifting height: 6-30m

Lifting speed: 0.3-8m/min

Hoist travelling speed: 20m/min

Crane travelling speed: 20m/min

Working class: A3~A4

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As the leading electric overhead crane manufacturer in China, overhead cranes are famous for their various models, high quality and cheapest price. Except those mentioned key advantages, some customer want an overhead electric crane because it can applied in assorted workstation, such as indoor occasion, warehouse, garage, port and outdoor storage place. Let us have a direct understanding on types of overhead crane according to the following introduction.

Overhead cranes, also call bridge cranes, move vertically along the rails on both sides of bridge structure. Hoist trolley runs horizontally on rails that laying on bridge structure. So that rails of overhead crane forms a square shape to transport material without hindrance of ground equipment. This type of device used widely on indoor and outdoor occasions like warehouse, plant, yard and factory. Basically, overhead crane has three different kinds including overhead crane for common purpose, portable overhead crane and overhead crane for special occasions.

Structure of common electric overhead crane



AQ-NLH Electric Overhead Crane Lifting capacity: 5-80t

Span:10.5-31.5m

Lifting height:6-18m

Lifting speed: 0.4-5m/min

Trolley speed:2-20m/min

Crane speed: 3-30m/min

Duty: A5

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Common electric overhead crane includes trolley, running bridge structure and steel structure of bridge. Besides, lifting trolley consists of lifting device, trolley running device and hoist frame. Lifting device of overhead crane motor, brake, reducer, drum and pulley block. The work theory is that motor brings hoist drum through reducer, and the wire rope on drum up and down to lower objects. Trolley frame is the structure that supporting and holding lifting device and trolley running machine, our group usually uses welding structure hoist frame.

The drive mode of overhead crane can be divided into two types: one is centralized driving. This driving way refers that use a motor to drive the long shaft aiming at powering the active wheel.The other one is separate drive. The theory is each side of active has a motor. For the most medium and small overhead crane, it uses three in one driving way (brake, reducer and motor in one device). For large capacity bridge crane, in order to install and adjust easily, our company often adopts universal coupling. Running structure of overhead cranes use four active wheel and one driven wheels. If you want a heavy duty rated loads, the common method is to increase the number of wheel for lowing wheel pressure. When wheels are more than four, overhead cranes have to use equilibrium frame device, which is able to disperse pressure to each wheel equally.



AQ-QD Electric Overhead Crane Lifting capacity: 5-450t

Span:10.5-31.5m

Lifting height:6-24m

Lifting speed: 2.1-11.5m/min

Trolley speed:27-40m/min

Crane speed: 42-75m/min

Duty: A3-A7

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Steel structure of bridge crane consist of main beam and end beam. Single girder overhead crane is made up of one single girder and end beam of bridge span. While double girder overhead crane includes two main beam. The connection of end beam and main beam is rigid coupling. There are wheels on both sides of end beam, which is to support bridge structure. End beam of overhead crane has rails for hoist trolley. The structure of main beam includes different types, such as box structure, fort truss structure and vierendeel truss structure. Box structure can be divided into right path box double girder, slanting track box double girder, slanting rail box single girder. Right track box double girder shape is widely used on crane manufacturing. Its main beam is made up of top plate, bottom flange plate and vertical web of both sides. Moreover, steel track of hoist is on the center line of top plate. This box has compact structure, so it is easy to make, and suits for bath production.

Slanting shape double girder and single girder type are made up of top and bottom plate. However, slanting box single girder uses a broad box shape main beam to take place of two girder, this design reduces its self-weight, but the process is complex.

Common electric overhead cranes are powered by electricity, the operator usually is in driver cab, and some drivers nay use remote control. The rated capacity is able to reach 500 tons, and the span can cover 60 meters.

Portable overhead crane and hanging overhead crane

Portable overhead electric crane has the same structure as common electric overhead cranes. However, its rated loads, span and working speed is smaller. Main beam of this crane is joint steel or simple plate steel. The hoist trolley can be block chain hoist or electric hoist. Like other overhead crane, hoist can move along main beam, and the crane is able to move along rail on ground. The other simple crane, also called ceiling crane or hanging overhead crane, it can transport loads without the support of bridge structure. Because of its light weight, this crane is able to move along rail on ceiling.

Special electric overhead crane

Except the two simple electric overhead cranes and common overhead cranes, there are special overhead cranes to meet the need of special occasions. Our company provides you metallurgy electric overhead crane, electromagnetism overhead crane for steel and iron factory, explosion proof electric overhead crane, grab overhead crane to carry loose material like sands, wasted material and grain.

Metallurgy overhead crane is used on the manufacturing process of steel, the structure is similar with common overhead crane. However, metallurgy crane has special working device, and hoist trolley use metallurgy hoist that has flame proof function. This crane fits for occasions that need density transportation, higher working class and bad working environment. This overhead crane consist of five types: clamp overhead crane, which use clamp to carry high temperature steel ingot. Stripping overhead crane, this crane is to pull steel joint off mold. Charging overhead crane, this crane is to add furnace burden to Martin furnace.

Casting electric overhead crane, this crane can be regarded as one of special type of metallurgy. This electric overhead crane is used on casting and foundry plant, and has better performance on this high temperature environment.

Explosion proof overhead crane, as its name showing, this crane use on occasion may have explosive gas and dust.

You can choose an electromagnetism overhead crane for your steel factory. This crane can hold steel plat, wasted iron material tightly. Besides, you can transport steel object in a wooden box. Double brake system makes this crane safe.

Grab overhead electric crane, this crane is designed to carry loose materials, for example, you can carry grain and sand by this crane. Huge grab bucket can transport large mount loads in a time. You can choose different grab according to the objects you are going to carry, such as a shell shape grab.

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