Bridge Crane Metal Structure Design

bridge crane is the bridge in the overhead track traveling, also known as overhead crane. Bridge crane along the track laying on both sides of the elevated vertical track, lifting trolley along the track laid on the bridge running laterally to form a rectangular work area, you can take full advantage of the space under the bridge lifting material, not obstructed by ground equipment.

This time the main parameters of the overhead crane are designed as follows: lifting capacity of 10t, span of 34m, lifting height of 9m, lifting speed 8m / min, long traveling speed V = 1.6 ~ 40m / min, cross traveling speed V = 50m / min, long traveling drive the way is to drive separately; The main beam type of the overhead crane with box girder.

According to the above parameters to design the program are as follows:

Bridge Crane Main Girder Design

The main beam span is 34m, is composed of upper and lower cover and two vertical webs composed of closed box-section solid girder connected to the girder cross-section of the web Thickness of 6mm, the thickness of the flange plate is 10mm, the width of the walkway on the main beam depends on the length of the end beam and the plane size of the trolley running mechanism. The height of the center of the main beam span should be H = L / 17. The overlapped form is adopted. The height of the connection between the main beam and the end beam should be H0 = 0.4-0.6H. The stability of the web is maintained by the transverse stiffener plate and the longitudinal stiffener or angle steel. The longitudinal stiffener is welded by continuous spot welding. Beam flange plate and web welding fillet weld seam, the main beam will usually produce under the deflection deformation, but the processing and assembly using prefabricated arch.

Bridge Crane End Beam Design

The end-beam also plays an important role in the crane and it is a key component for carrying panning transport. Beam part is composed of a combination of the end of the wheel beam frame, the beam part of the main cover plate, web and lower cover composition; end beam is connected by two sections and angle plate with high strength bolts. In the inner end of the beam is provided with ribs to ensure the stability of the end beam after loading. The main dimensions of the end beam are determined according to the span of the main beam, the wheelbase of the cart and the track gauge of the cart. The operation of the cart adopts separate transmission schemes. When assembling the crane, connect one section of the end beam with one of the main girders, and then connect the two sections of the end beam.

This article main introduces the box girder overhead traveling crane, confirms its overall plan and makes some simple analyzes. Box girder bridge crane with a few processing parts, good technology, versatility and ease of installation and maintenance of institutions and a series of advantages, which are widely used in the production. China's 5 tons to 10 tons of small and medium heavy lifting products mainly adopt this form, but this structure also has some disadvantages, such as :heavy weight, easy to scratch, when it is in the design and manufacture must take some measures to prevent or decrease it happened.

The design of the bridge crane metal structure includes the main dimensions of the design, the design of the main girder, the checking of the strength and the checking of the rigidity, the determination of the calculating load of the end girder, the calculation of the main welding seam, the design of the joint, the welding process design and so on.Lifting mechanism design including lifting scheme selection, the diameter of wire rope drum, hook choice, determined, and the calculation of the nut electric motors and reducer choice etc.

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