Double girder, double track, single hoisting trolley; Suitable for all kinds of working conditions; Mature technology, safe and reliable, easy to operate, and stable in operation. Most popular crane products.
QD type double girder overhead crane is suitable for all kinds of general working conditions, used for material lifting, equipment installation and maintenance, it is a versatile lifting equipment with a wide range of uses.It is mainly composed of main girders, crane traveling mechanism, trolley, cabin, and electrical equipment.
QD type double girder overhead crane adopts the structure of double girder, double track and single hoisting trolley.
The hoisting trolley is equipped with main and aux hoisting mechanisms, each adopting a set of independent transmission systems. The main and aux lifting mechanisms can complete the lifting independently, and can also complete the work in coordination.
The technology of the QD type double girder overhead crane is mature, safe and reliable, easy to operate, and stable in operation. It is a mature product of our company for many years and is the most widely used crane in our country and worldwide.
Compared with top running single girder eot cranes, double girder eot cranes have a much higher load capacity, and longer spans, higher Duty Group, and more flexible configuration for different working conditions, such as steel industry, explosion-proof place, isolated place, etc. Out of the responsibility and mission of double girder eot cranes manufacturer, we always help our customer choose the most suitable cranes for the special conditions. Same as other eot cranes, double girder eot cranes need support from the factory. With this limitation, they are commonly installed inside.
Technical parameters comparison
When choosing a crane, you will need to take several important aspects into consideration: your application, working environment, limitation of your facilities.
Applications: It is of great importance to make sure our engineer has known all the details of your requirements so that they can design or help your choose a crane that suits your application most, such as safe working load, where your want to move the load to, duty cycle and so on.
Working environment: An ordinary double girder eot crane will quickly scrap in an environment that filled with corrosive gas or of extreme temperatures. So, the environment is an important element to choose the suitable crane.
Your facilities: A double girder eot crane with the span of 30 m obviously can't be installed in the factory that the longest distance can be provided between two supporter is 20 m.
The main girder is a box-shaped structure on the track. The section of the main girder is systematically analyzed and calculated using ANSYS finite element calculation method to ensure that it has sufficient strength, rigidity and overall stability. The camber of the main girder is (1～1.4) S/1000 , And the maximum camber position is controlled within 1/10 of the middle of the span. The main stress member of the main girders is Q255B, and the minimum plate thickness is not less than 6mm.
The end carriages are the box-shaped structure, and the connection between the end carriages and the main girders is the rigid connection. In order to facilitate transportation, the end carriages are disconnected and connected by high-strength bolts. Each connecting plate is positioned with reamed bolts, and the positioning check mark has been made at the factory.
The tread surface of the bridge platform is made of non-slip patterned steel plate with a thickness of 3mm. The channels of the bridge are equipped with railings with a height of 1050mm. The railings are equipped with horizontal crossbars with a spacing of 350mm. Any place can withstand 1kN (100kgf) load from any direction without plastic deformation. All railings are connected by stamping plates and bolts, realizing no welding on site.
The main and auxiliary lifting mechanisms are arranged on the same trolley frame, with independent driving devices for each mechanisms
The working principle of the hoisting mechanism: the electric motor performs work, the speed is changed by the reducer, and then the drum is driven by the drum coupling, and the lifting hook is completed through the wire rope winding system.
The hoisting mechanism adopts a series resistance speed control system, which has stable braking and small impact and accurate positioning of the hook, which not only improves the user's production efficiency, but also greatly extends the service life of the components of the hoisting mechanism.
The components are compactly arranged and easy to maintain, ensuring safety and reliability.
The trolley traversing mechanism of the trolley is supported by 4 wheels, and a set of independent driving system is adopted to drive the trolley in a centralized manner.
When starting, the driving wheel does not slip, and when braking, it is stable and reliable. This structural arrangement is conducive to the installation, maintenance and disassembly of the components of the drive system.
The crane traveling mechanism is supported by 4pcs crane wheels, and two independent drive systems are used to drive the crane separately.
The transmission type of the crane traveling drive system is: a motor drives a reducer through a gear coupling and a transmission shaft. The low-speed shaft of the reducer is connected to the wheel shaft with a coupling, and the driving wheel ratio is 1:2. When starting, the driving wheel does not slip, and when braking, it is stable and reliable. This structural arrangement is conducive to the installation, maintenance and disassembly of the components of the drive system.
Forged hook block
The hook is a forged hook, hook material is DG20.
The ratio of the pulley diameter to the wire rope diameter is greater than 20 to ensure the service life of the wire rope
The pulley material is cast steel or nodular cast iron, the cast steel is no less than ZG310-570, and the performance of nodular cast iron is no less than QT400-18.
The coupling is safe and reliable, with good transmission performance
The drive shaft is made of 45# steel, and the strength is strictly calculated. Ensure its reliable strength and smooth transmission torque.
The fiber core steel wire rope is soft and has good bending performance. It is strong toughness, non-absorption, resistance to extrusion, etc. The steel wire rope is not easy to be deformed, the diameter is uniform and stable.
The corner box type wheel sets are all led out by oil pipes, which is convenient for oiling and maintenance
The wheel material adopts ZG340-640, and is subjected to advanced power frequency heat treatment and quenching
Adopt YWZ series hydraulic thruster type brake
The braking is stable, safe and reliable, and the action frequency is high.
The electric motor is suitable for driving various lifting machinery and metallurgical auxiliary equipment. It has high overload capacity and mechanical strength. It is especially suitable for short-term or intermittent operation, frequent starting, braking, and equipment with significant vibration and impact. The motor has good sealing
The buffers has the good performance of absorbing the energy of the motion mechanism and reducing the impact
The crane and trolley operating mechanisms are equipped with travel limit switches. When running to the limit position, it can automatically cut off the power supply and send out a signal.
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