Tube expander

Abstract

The invention relates to a tube expander. The tube expander comprises a cylinder, eight groups of expanding roll structures, a leading screw, a conical plate and a leading screw sleeve, wherein each expanding roll structure comprises a swinging arm, an expanding roll framework of which a back end part is fixed to one end of the swinging arm, roll shafts which are installed on a left side wall and a right side wall of the expanding roll framework, and expanding rolls which are installed on the roll shafts through bearings; the other end of the swinging arm is hinged with the tail end of the cylinder; the expanding roll framework is arranged on the front part of the cylinder; the inner end of the leading screw is fixed inside the cylinder; the leading screw is parallel to an axial center line of the cylinder; an outer end part of the leading screw extends out of a cylinder opening at the front end of the cylinder; the conical plate is sleeved on the leading screw; the leading screw sleeve is installed on the leading screw; the conical plate is arranged between the expanding roll framework and the leading screw sleeve; the side surface of an excircle of the conical plate is a conical surface; a conical fan-shaped camber which is matched with the conical surface is arranged on a front end part of the bottom surface of the expanding roll framework; and the conical surface of the conical plate is arranged correspondingly to the conical fan-shaped camber of the expanding roll framework. The tube expander has the advantages of scientific design, high practicality, high production efficiency and reliable production quality.

Description

technical field [0001] The invention relates to equipment for processing pipes, in particular to a pipe expander for processing pipes. Background technique [0002] Expansion pipe is an important pipe used in the processing technology of expanded perlite. Due to the long body and large diameter of the expansion pipe, there is no ready-made mature product on the market; the existing expansion pipe is rolled by a pipe coiler. Formed, but due to the high strength of stainless steel, it is very difficult to roll. Every time before rolling the tube, the end of the steel plate needs to be pre-bent manually, so that the roundness and straightness of the rolled product have large errors. The roundness error is generally 6mm, and the straightness error is generally 10mm; due to the large errors of these two items, it is difficult to install the expansion furnace and the sealing performance around the expansion tube is poor; usually, after the expansion tube is rolled and welded, it n...

AI Technical Summary

Problems solved by technology

[0002] Expansion pipe is an important pipe used in the processing technology of expanded perlite. Due to the long body and large diameter of the expansion pipe, there is no ready-made mature product on the market; the existing expansion pipe is rolled by a pipe coiler. Formed, but due to the high strength of stainless steel, it is very difficult to roll. Every time before rolling the tube, the end of the steel plate needs to be pre-bent manually, so that the roundness and straightness of the rolled product have large errors. The roundness error is generally 6mm, and the straightness error is generally 10mm; due to the large errors of these two items, it is difficult to install the expansion furnace and the sealing performance around the expansion tube is poor; usually, after the expansion tube is rolled and welded, it needs to be expanded. The pipe device corrects the straightness and roundness of the pipe. However, the expanding roller of the existing pipe expanding device is fixed, which is easy to wear and has a short life. When in use, it is easy to cause damage to the expanding pipe. The angle cannot be adjusted, so that its applicable pipe diameter range is limited

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