Double Girder Overhead Crane

Double Girder Overhead Crane

Weihua Crane Machinery Co., Ltd.

Address:Industry Park, Changyuan, Henan, P.R.C


Double Girder Overhead Crane is double girder bridge crane with hook, suitable for indoor or outdoor fixed cross intercropping handling and transport work. Lifting capacity range 5T-1000T, working-level generally divided into A3, A5, A6. A3 overhead crane is apply to maintenance equipment for power plants and other places not often use. A5 is double girder overhead crane usually use working-level, commonly used in factories and mines, workshops, warehouses and other places. A6 usually used for frequently used places, it belonging to heavy duty system. Our overhead crane sales amount is the most in China, and its production capacity is the world's largest.
Double girder <a  data-cke-saved-href= Double Girder Overhead Crane consisted with double girder bridge mechanism, traveling mechanism, trolley with frame and electrical parts. Compared to single girder overhead crane, its structure is stronger, more secure use, so double girder overhead crane lifting capacity is larger.
Large tonnage of  Double girder <a  data-cke-saved-href= Operation mode can be selected for ground operations, remote operation, and driver’s cabin according to the specific circumstances. Because of big span, large lifting capacity, high lifting height, usually more use driver’s cabin operation. Each mechanism of crane operating speed can be designed into fixed speed; may also be designed to VVVF inverter type, using with hook anti-sway.

Weihua Crane is professional material handling equipment manufacturer and servicer with largest production in global. Provide you with overhead crane, gantry crane, electric hoist, etc. of safe, reliable and efficient crane solutions and services.


Double girder overhead crane is widely-used hoisting machinery at present. It mainly consists of  4  parts,  bridge frame(two  main  girders and two end  beams),  crane traveling mechanism, trolley with frame and electrical parts. The major supporting frame of the crane is the bridge frame composed by main girder of box shape, end beam, walkway, rail and operating cabinet. Trolley is located on it, trolley is a rigid frame welded by steel plate. Main hoisting mechanism, auxiliary hoisting mechanism and trolley operating mechanism are on the trolley. Crane operating mechanism is equipped on both sides of the bridge frame end beam. The electrical parts are mainly located on the walkway of crane and the operation cabin, and the power is connected to main switch of the crane with special purpose sliding wire.
Double girder overhead crane Sketch
Trolley and Crane Traveling Mechanism
Trolley and crane operating mechanism are composed of motors, reducers, couplings, brake and wheel set, etc. The wheel runs in two directions driven by reducers and couplings under driving moment generated by motors, trolley and bridge frame can achieve lifting back and forth from place to place.

Double girder overhead crane Trolley and Crane Traveling Mechanism Double girder overhead crane Lifting Mechanism
Double girder overhead crane Trolley and Crane Traveling Mechanism Double girder overhead crane Lifting Mechanism
Lifting Mechanism
Hoisting mechanism is composed of motors, reducers, drum set, wire rope and lifting hook, etc. The lifting hook goes up and down under driving moment generated by motor; the heavy object goes up and down with the hook.
Double girder overhead crane lifting mechanism can be with two trolleys, double trolley generally used for lifting special materials, its structure is safe and reliable, with strong practicability.
Crane trolley consists of one or two sets (main and auxiliary) hoisting mechanism, trolley traveling mechanism and trolley frame, etc.
Security Assurance
In order to ensure normal work and orientation of any position of the crane, safety device are equipped in each mechanism. For example, braking device is equipped on high-speed shaft of motors and reducers, and it’s composed of brakes and braking wheel coupling.
The brake is closed type. Brake shoe is opened when energized, and closed when power off, can make the lifting weight stopped accurately at any position during hoisting, the trolley and crane traveling mechanism will be stopped, precise orientation will be realized.
Except for braking device, limit switch and overload limiter are equipped on hoisting mechanism. Trolley and crane are all equipped with limit switch. Safety device such as current protection, voltage-loss protection, zero position protection, emergency switch, main isolator, cabin door interlock switch and electric bell prompt etc. are equipped in the electric circuit in order to ensure normal operation of crane and personal safety.
Exposed, rotating parts may have hurt people of the crane, installed with protective cover.

Double girder overhead crane Production Process Requirement
The main load components such as main beam, end beam, trolley frame, etc. adopt Q235, Q345 steel material (similar to Fe37 or Fe52). Raw steel material surface shall be shot blasting treated before use.
The main beam and end beam have good stiffness and strength, with box structure, connected by bolts to facilitate transportation. Trolley frame structure is composed of box-beam; the static deflection with full load shall be less than LK/2000, which fully guarantees the smooth operation of mechanism on the trolley. The main beam shall have camber, in the middle camber should be (0.9/1000 ~1.4/1000) S.
Double girder overhead crane Production process requirement
External of weld seam shall have no obvious defects, including cracks, cavities, solid inclusions, incomplete fusion and incomplete penetration, shape defects and other defects. And nondestructive testing should be carrying out on weld seams, to ensure that the internal structure of weld seam to meet the requirements.
Wire rope winding on the drum, there shall be at least two safety wraps in addition to the fixed wraps.
Width of walkway shall be more than 500mm, walkway applies checker plate and can withstand 3kN movable concentrated load without permanent deformation. Handrail for walkway and end girder shall be 1050mm high, set retaining plate more than 50mm high at the bottom.
Crane wires should be laid in slot or metal tube. Wire passing through metal hole to prevent wire wear. Tube or duct should be connected as near to the electrical equipment as possible, wires that can be touched should be laid in duct or metal tube.
Both ends of the wire must have permanent identification mark consistent with that in the circuit or wiring diagram.  None of the wire allows middle connection; illuminating wire is allowed to be connected by transition terminal near the equipment. Wires of  different  mechanisms,  different  voltage  type  and  different  voltage  level wires should  be  kept separately during through the tube. Illuminating wire should be laid separately.
Trolley power supply shall use cable to conduct electricity. Set fixed wire case (box) on suitable position of bridge and trolley frame. And set haulage rope to ensure that cable bears no force during the trolley travels.

Technical Data

50t Double girder overhead crane Sketch and Technical Parameter

Contact Us

Simply complete the form below, click submit, you will get the price list and wo will contact you within one business day. Please also feel free to contact us by email or phone.

Click image to refresh

Weihua Cranes Machinery Co., Ltd.

Weihua Crane standard
Weihua Cranes started since the year 1988; it is professional material handling equipment manufacturer and servicer with largest production all over the world. With Weihua Cranes historical influence, “China Crane Town” (which covers more than 2/3 crane market in China) developed in the area around Weihua Cranes headquarter.
Weihua Cranes main businesses are researching, developing, manufacturing and sales of all kinds of lifting equipment. We have passed the ISO9001 quality system certification, ISO14001 environmental management system certification, OHSAS18001 occupational health and safety management system certification, CE certification, etc.
Weihua Cranes advantages and differences with other crane manufacturers are that we have professional crane team to provide you with safe, reliable, efficient crane solutions and services, and as far as possible to reduce your cost. Crane your business, let’s develop together!


Excellent Product and Solutions

Weihua Cranes become one of general hoisting machinery manufacturing industry leader with the largest production and sales volume. We can provide electric hoists, single/double beam overhead cranes, gantry cranes, and such varieties of lifting equipment 10 serious more than 200 types. The lifting capacity of the overhead crane can achieve 1000t, and the gantry crane 900t, to meet all kinds of project need.
Cranes is committed to provide total optimized crane program solution and perfect service to help customer to save cost and improve efficiency.


Advanced R&D | Strong Q&C | Production capacity

Weihua Cranes has Technology Testing and Inspection Center authorized by the state, post-doctoral research station, obtains 283 technology patent certificates and inventions, R & D team of Weihua with 600 people and with Shu-zi Yang (academician from the Chinese Academy of Engineering) as the foregoer, is the biggest one in general purpose crane industry in China.
Cranes now adopted the “lean production management”, the undaunted testing and outstanding market performance, ensuring Weihua Cranes stand out as the leading brand within crane industry. Weihua Cranes continuously make the innovation on technical and strict on QC management to keep the products quality steady improving.

Weihua Cranes total asset is of 0.78 billion US Dollar, over 6000 employees, covers an area of 3.42 million square meters, one of Weihua Cranes workshop is the largest within the whole world crane industry. A varieties of 1700 sets manufacturing and testing equipment, including machining, heat treatment, welding, assembly, testing and packaging shipped metering and other ancillary equipment with a full range of advanced production scale and production capacity.

Outstanding Marketing Performance & Long-term Partner

Production and sales of overhead and gantry cranes won the first in China for continuous 8 years. And now, total production amount of Weihua Cranes products achieve world first. Weihua Cranes has developed strategic partnership with Siemens, GH Spain, Demag, SEW, Schneider, etc.

Weihua Cranes are widely used in machinery manufacturing, iron and steel metallurgy, nuclear industry of mining, water conservancy and hydropower, roads and railways, electric power, automobile manufacturing, petrochemical, port logistics, shipbuilding and other material handling, etc. We have successfully exported to more than 90 countries and regions such as the United States, Great Britain, Russia, India, Brazil, Peru, South Africa, Mongolia, South Korea, Australia, Southeast Asia, the Mid-East, etc. And get well reputation.
Weihua Cranes with strong capacity, focus on customer service, provide with first-class quality, safety and reliable products, create more and more value for customers, these are the reasons we set-up stable and long-term relationship with our customers.


Weihua Crane Make the World Easier | Craneus