A butt welding expansion device for rectangular tube groups

Abstract

The invention discloses a rectangular pipe assembling and welding expansion bracing device and belongs to the field of rectangular pipe assembling and welding. The rectangular pipe assembling and welding expansion bracing device comprises two expansion bracing supports. The two sides of each expansion bracing support are each symmetrically provided with an arc groove. The circle center of each arc groove is outward. The interior of each arc groove is in sliding connection with a supporting leg. One end of each supporting leg is provided with a sliding shaft. The sliding shafts are matched with the arc grooves. The supporting legs are stretched, the ends of the supporting legs are provided with rollers, and the rollers at the ends of the supporting legs abut against the four right-angle corners of a rectangular pipe to be stretches correspondingly. In the stretching process, the rollers on the supporting legs achieve expanded bracing for the four corners, four edges are indirectly stretches, the instability phenomenon caused by changes of the four edges is avoided through self adjustment of the arc grooves and the sliding shafts, it is ensured that adjustable expansion bracing is achieved, rolling contact is formed between the inner wall of the rectangular pipe and the supporting legs when the sizes of the four edges are changed in the expansion bracing process due to the arrangement of the rollers, friction force produced during adjustment contact is reduced, and the surface of the workpiece is prevented from being scratched.

Description

technical field [0001] The invention relates to the field of rectangular tube group welding, in particular to a rectangular tube group pair welding expansion device. Background technique [0002] At present, circular pipes are mostly used in the field of ventilation, and when they cannot be applied due to the influence of the site and the environment, rectangular pipes will be used. When the cross-sectional size changes, the expansion and welding of circular pipes can be easily realized by using expanders. At present, when expanding the rectangular tube, the four sides are generally expanded, and this expansion method will cause a large number of welding repairs at the final four corners, and the processing quality requirements here will be very high. If it is a square For tubes, the four corners can be expanded by using the expanders of circular tubes, because the crossing of its diagonals is a right angle, and the force on each side is the same when expanding, while for re...

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Problems solved by technology

[0002] At present, circular pipes are mostly used in the field of ventilation, and when they cannot be applied due to the influence of the site and the environment, rectangular pipes will be used. When the cross-sectional size changes, the expansion and welding of circular pipes can be easily realized by using expanders. At present, when expanding the rectangular tube, the four sides are generally expanded, and this expansion method will cause a large number of welding repairs at the final four corners, and the processing quality requirements here will be very high. If it is a square For tubes, the four corners can be expanded by using the expanders of circular tubes, because the crossing of its diagonals is a right angle, and the force on each side is the same when expanding, while for rectangular tubes, because the diagonals are Non-right-angle structure, if the four corners are also expanded by the expander of the circular tube, there will be uneven force, and it is easy to break a certain side. In order to ensure the quality, it consumes a lot of manpower , financial resources are huge

[0003] In view of the problems existing in the above-mentioned prior art, in order to solve the disadvantages of slow efficiency, reduced labor intensity and high potential safety hazards, the present invention designs and manufactures a rectangular Pipe group butt welding expansion device to overcome the above defects

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