A polyhedral structure for the lower head

Abstract

The invention discloses a polyhedral structure used for a lower shell cover. The polyhedral structure comprises a polyhedral bracket, a supporting ring, two pairs of connecting pieces, a plurality of stop pieces and two pairs of hooks. The supporting ring is connected with the top of the polyhedral bracket. One end of each pair of connecting pieces is arranged on the supporting ring, and the other end of each pair of connecting pieces is arranged on the top of the polyhedral bracket. The stop pieces are evenly and symmetrically arranged on the supporting ring. The two pairs of hooks are respectively arranged on the polyhedral bracket. The evaporator lower shell cover provided with temporary process rings is assembled on the polyhedral structure; according to different angles, the process rings are rotated so that the axes of connection tubes can be perpendicular to a certain surface of the polyhedron, and then the connection tubes can be fixed; afterwards, the polyhedron is turned over, in this way, the connection tubes at different angles of the lower shell cover can be vertically downward, and therefore the overlaying problem of the connection tubes is solved. Furthermore, some supporting accessories can be additionally arranged so that the structure of the polyhedron can be adjusted to different angles, stations for manual welding of the connection tubes at other positions are achieved, production efficiency is enhanced, and the production cost is lowered.

Description

technical field [0001] The invention relates to a welding auxiliary device for the lower head of an evaporator, in particular to a polyhedral structure for the lower head. Background technique [0002] The lower head of the evaporator is a semicircular spherical surface, and there are multiple angles of connecting pipes and manholes distributed on the spherical surface. The ideal position for welding the inner wall R area of ​​the connecting pipe and the manhole is that the connecting pipe is vertically downward. In the prior art, according to the angle of each connecting pipe, it is necessary to design triangles with different angles, and then install them with the lower head respectively, and then weld the upper displacement device. Due to the limited number of displacement devices, the cost is expensive, and each angle Triangular irons need to be manufactured, the manufacturing cost is high, the debugging time is long, and the head needs to be installed horizontally durin...

AI Technical Summary

Problems solved by technology

In the prior art, according to the angle of each connecting pipe, it is necessary to design triangles with different angles, and then install them with the lower head respectively, and then weld the upper displacement device. Due to the limited number of displacement devices, the cost is expensive, and each angle Triangular irons need to be manufactured, the manufacturing cost is high, the debugging time is long, and the head needs to be installed horizontally during installation. In addition, a shelf for placing the triangle irons needs to be designed, which brings a lot of inconvenience to production, resulting in low production efficiency and high production costs.

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