Double girder gantry crane is widely used for loading, unloading, transporting material in open goods yard, hydropower station, assembly field, construction site, station, industrial and mining enterprises, railway engineering. Double girder crane has many advantages, such as large loading capacity, wide span, good stability, various types, thus double girder cranes have wide application in lifting industry. According to girder, our company, a famous crane supplier in china, produces double gantry into two types, box type girder and truss type girder. And girder with box type is more popular. Because the box type girder is welded by steel plate, which is safe and solid.
According to different purpose, double girder crane mainly includes following types, general goliath crane, industrial crane, ship gantry crane, container gantry crane.
First is goliath crane. This kind of gantry crane adopts box type girder and truss type girder, and has the widest application. It can transporting kinds of items and bulk material. Gantry crane with grab has higher working class. What’s more, it can be also used together with hook and electromagnetic sulking disc. This type of crane also includes semi gantry crane.
Second type is about industrial gantry cranes, mainly refer to rail mounted gantry crane. With heavy duty and frequent work, it is better to improve working class.
Third is ship gantry crane or boat crane, it is used for assembling the hull. It has two lifting trolleys. One trolley with two main hooks, travels on the girder, the other trolley with a main hook and a vice hook, travels under the bridge flange.
Fourth is container gantry crane. It mainly includes two types, rubber tyred gantry crane (rtg crane) and rail crane. This kind of crane is popular for saving energy and labor resource, raising work efficiency and improving work condition.
Gantry crane structure is composed of crane travelling mechanism, lower cross girder, legs, cabin, and main girder, hoist travelling mechanism, lifting mechanism, escalator and electric appliance.
The crane travelling system is combined by lower cross girder, driving wheel group and driven wheel group. The travelling mechanism is type of respective driving. It mainly includes electric motor, three in one reducer, driving gear wheel, big gear wheel and wheel group.
The lower cross girder structure is welded by steel plate. It is very durable and solid. The leg has cage mechanism welded by section steel. Legs and girders are connected with bolts.
Cabin frame is welded by section steel. Its cover is welded on the frame by thin steel plate. The cabin adopts closed line type. Electric appliance, power distribution cabinet and circuit are set in the operation room.
The main girder is welded by section and steel plate. It has the truss triangle shape. Steel rail is for trolley travelling is welded on the main girder.
The trolley travelling mechanism has similar components as crane travelling mechanism has. Electric motor drives through reducer, then transmits from small gear wheel to big gear wheel. Small gear wheel is on the low speed shaft of reducer. In this way, the trolley can move.
When you are installing a gantry crane at your worksite, you have a couple different options. The first, and most common, is to install a single girder gantry crane. The other option is a double girder gantry crane. There are only a couple of differences between the two, and they operate in a very similar manner. It just depends on the type of industry you are in, how much weight you have to lift, and how far it needs to be moved. Let’s go over the construction of gantry cranes and then look at the differences between those that have one or two girders up above.
1. Durable material, top quality
2. Perfect performance, reliable properties
3. Safety protection device, long-term service life
4. Light weight, small wheel press, low noise
5. Factory price, low failure rate, simple operation