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, Ellsen 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.
What are the double girder crane types?
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.
Details about gantry crane system
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.
The differences between double gantry crane and single girder cranes
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.
An overview of the construction of gantry cranes
When you are constructing these gantry cranes, you will see how simplistic they actually are despite how much they are able to do. First of all, there are the upright supporting legs which are either built into the ground for support, or they can utilize the existing structure of a warehouse using the beams that support the structure and the roof. Up top you will have either one or two girders that will be supported on runway girders, each with an end truck. This will allow the operator to successfully move the girder along the runway girder on either side which is what is connected to the supporting beams.
How do they lift weight?
A single girder gantry crane has one girder up top which is able to move back and forth along the runway girders so that merchandise can be moved from one place to another. It will have a trolley hoist which is connected to the top girder which is moving. This is how things are lifted up and down. It is typically only connected to the one girder, but when there are two that are used, this is going to create a different scenario which is actually more beneficial when working in areas where enormous amounts of weight must be moved on a regular basis.
Single and double girder gantry cranes
The only difference between these two in regard to construction is that there are two overhead girders on a double girder gantry crane instead of one. The reason for using to is that it provides extra support, and when working together, they can utilize a much more powerful hoist that can lift merchandise that is extremely heavy. People that install double girder gantry cranes are able to not only lift more weight, but they will have the ability to go much faster. These are typically designed for speed and handling excessive amounts of weight of merchandise that is packaged and sold every day.
As you can see, there is not that much of the difference between a single girder gantry crane and a double girder gantry crane with the exception of its power. This one additional overhead being provides the additional support that is necessary to handle heavier loads, making them much more useful for larger operations. It is possible that you could use a single girder gantry crane at multiple locations, yet this would defeat the purpose of actually lifting more weight. You can decide which one will work best for you by finding out what the maximum loads will be, calculating that weight, and then making your decision on getting one with one or two girders.
Best safety options on double girder gantry crane
When you start to search for double girder gantry cranes, you might wonder if this is the best choice for your particular business. It is possible to get a single girder gantry crane that is going to cost less money, but will it hold up over the long run? There is also the question of safety in regard to its overall stability, and will it collapse with some of the merchandise that you are constantly moving. Whether you are moving pallets of products, containers, engines, or large components for industrial businesses, it’s always important to have a gantry crane that can withstand all of the weight and movement.
What does a double girder gantry crane do?
When you see the installation of one of these overhead cranes, you will see that they are designed to withstand a considerable amount of weight. There almost always within a enclosed area such as a hangar, or a warehouse, where merchandise is picked up with the hook that is on the hoist, and will likely move back and forth along the length of the building, and side to side using the trolley system on top. So how can you tell if they are going to handle the weight of the products that you are going to use every day? It has to do with the lifting capacity and span length of the crane.
Choosing the right one for your business
The lifting capacity is a reference to how much a gantry crane is able to lift safely, and is not reflective of the power of the hoist itself. It is simply referential of how much it can stand before buckling, at which point there would be a safety issue. For example, if you are going to use a 32 ton gantry crane, with a spend length of 10 to 20 m, you need to make sure that the products that you are lifting do not exceed that, even though the hoist may easily go up to 50 times or more.
Securing the best deals on double girder gantry cranes
Getting the best deals is as simple as contacting businesses that are overseas, preferably in countries like India and especially China. These are countries where the labor cost is much lower, and the cost of raw materials is also very inexpensive which is why you can get excellent deals from these places. Make sure that you are working with the company that is exceptional in regard to reputation, and also customer service. You want to work with the business that is going to put you first above their own needs. As long as you can communicate with them, order your gantry crane and have it sent in a timely manner, this is likely a company that you will continue to use for further purchases.
The process of finding and subsequently ordering one of these gantry cranes will typically be a very easy process. You might choose to go with a local company that may actually produce them, or you may settle for a business that is much less expensive, even though you have to wait several weeks because it is in a different country. The latter option is typically the best one in regard to price, so do your research and find the best gantry crane manufacturer that can ensure the safety of your company employees using their quality products.
Features of Ellsen double gantry
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