A welding expansion device for rectangular tube group

Abstract

The invention discloses a rectangular tube assembly welding expanding device and belongs to the field of rectangular tube assembly welding. The rectangular tube assembly welding expanding device comprises two expansion supports. An expansion block is arranged between the two expansion supports. The expansion block has certain conicity. The expansion block descends to expand the two expansion supports outwards. The two sides of the each expansion support are symmetrically provided with arc slots. The circle center of each arc slot faces outwards. A support leg is slidably connected into each arc slot. One end of each support leg is provided with a sliding shaft which is connected with the corresponding arc slot. The support legs are stretched. The ends of the support legs are provided with rolling wheels. The rolling wheels of the ends of the support legs abut against four right angles of a rectangular tube to be expanded. In the expanding process, the rolling wheels on the support legs can expand the four angles so as to stretch the four sides indirectly. Through automatic sliding adjustment of the arc slots and the sliding shafts, the rectangular tube assembly welding expanding device continuously conducts self-locking and adjusting so as to avoid the phenomenon of instability caused dimensional change of the four sides. It is guaranteed that adjustable expanding can be realized.

Description

technical field [0001] The invention relates to the field of rectangular tube group welding, in particular to a rectangular tube group 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 rectang...

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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 Tube group welding expansion device to overcome the above defects

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