How is double-girder overhead crane structure?
11:03 - 09/10/2018 2391

Double-girder overhead cranes are used to lift cargo equipment weighing up to 100 tons or more. The structure of the double-girder overhead crane is basically composed of all single overhead crane structures  but different in the details of the structure.

 

How is double-girder overhead crane structure?

Double-girder overhead cranes are used to lift cargo equipment weighing up to 100 tons or more. The structure of the double-girder overhead crane is basically composed of all single overhead crane structures  but different in the details of the structure.

Double-girder overhead cranes are used in which sectors?

Factories producing concrete, metallurgy, heavy equipment production, and machinery and equipment transportation will need double-girder overhead cranes. However, because the structure is relatively complicated, not everyone could understand the structure and type of this kind of crane.

Structure of double-girder overhead crane

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Double-girder bridge crane consists of 2 main girders connected to two edge girders, hoist moving structure, frame system, wheel box to move double-girder overhead crane, electrical cabinet for controlling all structures of the crane and other safety equipment.

Main girders of double-girder overhead crane

There are two main girders connecting with edge girders by bolt. Their function is to control and change according to the aperture and the crane and to the distance from the midpoint of the rail to hoist moving structure

When removing and adjusting the main girders, it is necessary to know which parts should be done first, which parts need to be fixed, which parts can be changed.

  • Producers need to pay attention that the distance from midpoint of rail to the hoist remains unchanged during the operation of the main girders on the rail. If this distance exceeds the regulated distance (the clearance between wheels and rails), it is crucial that this distance be adjusted so that it will not influence the operation of double-girder overhead crane.
  • The rail need to be processed flatly and perfectly parallel to avoid high friction that cause abrasion or hissing noise leading to the damage of equipment.

Edge girders of double-girder overhead crane

Edge girders are a framework including edge girder frame, wheel box, deceleration motor and play the role of moving the crane and rubber damping unit. Edge girders connect with main girders by bolt; the size of edge girders depends on the load and aperture of crane.

The higher the overhead crane can load, larger size the edge girders will be designed. It is necessary that the edge girders reach the perpendicular straightness of the wheel and the equal balance between two girders.

Power supply structure for hoist

Hoists are usually designed as lift-wheel hoist and they are connected with electric cable or electric chain cable. Electric cable is very important. Therefore, when installing, it is essential to pay attention on the sagging and elasticity of the cable. Cable length can be estimated based on equation: aperture of double-girder overhead crane multiple by 1.5.

Power source of double-girder overhead crane

Power source supplying system of the crane need to be stable; the moving distance of the crane must be calculated to match with the power source cable length. Normally, double-girder overhead cranes use 3P conductor to make the power supply line.

Electric cabinet of double-girder overhead crane

Similar to electric cabinet of single-girder overhead crane. Equipment installed inside the cabinet are imported from Japan, Germany, Korea. Electric cabinet is placed in area that allows installers to repair and maintain and is usually placed vertically along the main girders.

Safety devices

Safety devices include over-load alarms and inverters for the lifting mechanism for quieter crane operation.

Cabin control is always cool; the remote controller synchronizes with lifting crane structure. An additional remote controller can be installed if desired.

As the No. 1 unit in Vietnam in terms of lifting equipment production, with the localization rate reaching 90%, Quang Trung Industry Group is the first choice of enterprises and units that order the package designing, processing, manufacturing, installing and transporting double-girder overhead cranes with the best quality and many price incentives.

 

Please contact us for more details

QUANG TRUNG INDUSTRY GROUP JOINT STOCK COMPANY

- Address of representative office at: Lot 33, Villa 4, Linh Dam Peninsula, Hoang Mai, Hanoi

- Phone: 0379645086

- Email: tapdoanquangtrunggroup@gmail.com

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