Bearing type pipe expander

Abstract

The invention relates to a bearing type pipe expander which comprises an expansion rod, an expansion shell and an expansion ball, wherein the expansion shell is connected to the expansion rod and can slide; the expansion ball is arranged in the expansion shell; the rear part of the expansion shell is movably connected with a bearing; and the bearing can spirally rotate along the expansion rod. When an expansion pipe with a thinner expansion pipe port or a rough inner wall is expanded, the bearing outside the expansion shell can be in contact with the expansionpipe wall so as to reduce friction and avoid the expansion pipe port from being napped.

Description

technical field [0001] The invention relates to a tube expander, in particular to a bearing-type tube expander which can avoid tube mouth pulling and is used for expanding tubes with rough inner walls. Background technique [0002] The tube expander is used to expand the inner and outer diameters of the tubes in the manufacture and maintenance of various containers. It is a kind of expansion tool that is tightly combined with the contact parts of the tube and the tube sheet, will not leak water or air, and can withstand a certain pressure. At present, the tube expanders for expansion joints on the market all use expansion beads to be placed horizontally and vertically in the expansion shell, and the expansion shell is provided with an inner eight-character trapezoidal groove, which will produce a large force when screwing into the inside of the tube. Moreover, when expanding tubes with thin walls and rough inner walls, the tube expander will shrink back due to the toughness ...

AI Technical Summary

Problems solved by technology

At present, the tube expanders for expansion joints on the market all use expansion beads to be placed horizontally and vertically in the expansion shell, and the expansion shell is provided with an inner eight-character trapezoidal groove, which will produce a large force when screwing into the inside of the tube. In addition, when expanding tubes with thin walls and rough inner walls, the tube expander will shrink back due to the toughness of the tube material, making the nozzle rough and damage the nozzle

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