Double Girder Crane

Brief Introduction of Double Girder Overhead Crane

A double-girder overhead crane, also known as a double-girder bridge crane, is a common material lifting equipment in industrial production and transportation. On the crane, the bridge girder is directly supported on the track by the running device, and its metal structure is in the form of a box-shaped double main girder. It has been widely used in indoor and outdoor industrial and mining enterprises, the iron, and steel chemical industry, railway transportation, port terminals, logistics turnover, and other departments and places. Yuantai double girder cranes include QD-type double girder overhead electric winch cranes, QDX and QDY-type European double girder overhead cranes, LH-type electric hoist double girder overhead cranes, NLH type FEM double girder overhead cranes, QE type double trolley overhead cranes, QC type electromagnetic double girder EOT crane, QB type explosion proof overhead crane, QZ type grab bucket double girder EOT crane and other product types, with a lifting capacity of up to 550 tons. In addition, Yuantai can customize specific hoisting machinery to meet all your requirements. Double girder overhead cranes are most commonly used for cranes over 10 tons. According to the frequency of use, the work level is divided into A4, A5, A6, and A7.

Technical Parameters of Double Girder Bridge Crane

Double girder cranes are recommended for heavy-duty applications with lifts from 5t to 550t or spans over 10.5m.
Double girder EOT cranes are divided into indoor and outdoor. When ordering, the technical requirements such as the maximum and minimum temperature of the working environment and the type of power supply should be indicated. Yuantai Crane has added an overload limiter, a large-screen display, and various protection devices, which further enhance the safety of the crane during the working process.
For different lifting requirements, working environments, application needs, etc., we have QB, QC, QD, QE, QZ, YZ, NLH, LH, and other types of double girder cranes for you to choose from, the following are some of the models of the best-selling one. In addition, as long as you have requirements, Yuantai can also customize the crane that is most suitable for your working conditions.

The main difference between the double girder overhead crane and the single girder overhead crane is that the electric hoist of the single girder crane is installed under the girder, while the electric hoist of the double girder crane is installed on the top of the double girder, thus bringing a larger hook height (that is, the electric hoist can be raised to a height above the ground). And the double-girder crane has a higher lifting capacity, larger span, and higher working level. If you are faced with a wide variety of cranes and do not know how to choose the most suitable and cost-effective lifting equipment, please send us your general needs and specific parameters, and our professional engineers will provide you with free design solutions. For your reference.

Design Concepts and Components of Double Girder Overhead Crane

The double girder overhead crane is generally composed of a bridge frame (also known as a cart), a cart operating mechanism, a trolley equipped with a lifting mechanism, a control room, and an electrical system.
The lifting mechanism includes a motor, a brake, a reducer, a reel, and a pulley block, which are used to vertically lift objects, and the trolley running mechanism is used to move laterally with a load; Move to achieve three-dimensional space for handling and loading and unloading goods.
Bridge
In simple terms, a bridge or beam is a support structure that allows trolleys and cranes to move along the bridge from side to side.
Trolley and Lifting Mechanism
The lifting mechanism includes a two-in-one motor, brake, reducer, coupling, drum, pulley block, hook block, wire rope, and other main components. The motor drives the reel to rotate through the reducer so that the wire rope is wound on the reel or put down from the reel to lift the heavy objects. The trolley frame is a frame that supports and installs components such as the lifting mechanism and the trolley running mechanism, usually a welded structure. The trolley is used to precisely position the lifting mechanism before lifting or lowering the load.

• Electric motor: adopts a three-in-one mechanism.
• Pulley: The ductile cast iron pulley is used in conjunction with the wire rope groove. The ratio of the pulley groove diameter to the wire rope diameter is greater than 20 to 28 times.
• Hook: It is forged and made of 20# steel specified in GB699-88. Shock resistance has been tested by magnetic particle and obtained the certificate, all are equipped with the anti-decoupling device.
• Steel wire rope: It is a hemp steel wire rope, which conforms to the GB8918-96 standard. The steel wire rope adopts a safety factor of more than 7 according to the national standard.

Features and Advantages of Double Girder EOT Crane

• Double girder bridge crane has the characteristics of compact structure, light weight, large load, and strong wind resistance.
• The dual-motor independent drive device is adopted to reduce the wear of the rail and reduce the possibility of failures such as the wheel climbing off the rail.
• The double-girder structure makes the bridge crane bridge have sufficient strength, rigidity, and stability.
• The leading parts of each mechanism adopt the frequency conversion speed regulation mode to realize the speed regulation control function.
• Low noise during operation, easy to operate, and the conductive device of the cart is installed under the beam of the crane, which is convenient for maintenance.
• Adopt multiple safety protection systems, including short-circuit protection, no-voltage protection, emergency power-off switch protection, overload limit protection, travel limit protection, etc.

Double Girder Bridge Crane Applications

• Electric hoist double girder overhead cranes are widely used in the operation, assembly, maintenance, and loading and unloading operations of machining workshops, auxiliary workshops of metallurgical plants, warehouses, stockyards, power stations, etc.
• Hook bridge cranes are mainly used in various factories, warehouses, construction sites, and other indoor workshops.
• An explosion-proof crane is suitable for harsh working environments such as chemical plants, coal mines, and factories with explosive and flammable substances.
• Electromagnetic cranes are widely used in metallurgy and machining workshops to transport magnetic black products and materials such as steel ingots, section steel, pig iron blocks, scrap iron, and scrap steel.
• Double trolley overhead cranes are usually suitable for general hoisting and loading and unloading operations in machinery manufacturing workshops, warehouses, stockyards, hydropower station maintenance, assembly, and other places.
• Grab overhead cranes are widely used in the lifting of bulk goods such as warehouses, yards, and workshops.
• The ladle bridge crane is the main lifting and transporting equipment in the smelting workshop of the steel plant. It is used for the transfer, pouring, and mixing of molten iron during the smelting process.
• European-style EOT cranes are used in warehousing and logistics, precision machining, metal manufacturing, wind power, automobile manufacturing, rail transit, construction machinery, and other operations.

Why Custom a Crane Solution?

At Yuantai, we know that there is no "one size fits all" in the lifting field. Universal cranes are suitable for general factories, warehouses, etc. Besides, different applications have different needs for cranes. For example, steel industries often lift steel plates, so need electromagnetic cranes. Ports and docks often need to load ore, gravel, and other bulk goods, so need to grab bucket cranes. Chemical dangerous places often need to carry flammable and explosive materials, so need explosion proof cranes.

So, we provide customized cranes according to the special needs of our customers. Custom crane solutions offer many benefits in a variety of applications：

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If you have any crane needs, please contact us online or email us at cherry@ytcrane.com. WhatsApp/WeChat：+86 15093126500 . Our crane engineers will give you a suitable crane solution and a specific crane price within 24 hours.