a tube expander

Abstract

The invention provides a tube expander, and belongs to the technical field of tube expansion equipment. The problem that an existing tube expander is inconvenient to use is solved. The tube expander comprises a fixed chuck and a pair of connecting rods, a fixed sleeve is fixedly connected into the fixed chuck, a core shaft is arranged in the fixed sleeve in a penetrating manner, a pair of handles are hinged to the fixed chuck, one end of each of the pair of connecting rods is hinged to the corresponding handle, and the other end of each of the pair of connecting rods is hinged to the rear end of the core shaft; the handles are wrenched to drive the core shaft to move along the fixed sleeve, the front end of the core shaft is sleeved with an elastic expansion head, and the elastic expansion head comprises an elastic portion and a connecting portion; a plurality of gaps are formed in the elastic portion in the axis direction of the core shaft, and the gaps extend to the connecting portion; the connecting portion is fixedly connected with the fixed sleeve, and an expansion joint is arranged at the portion of the front end of the core shaft, and can stretch into the elastic portion to enable the elastic portion to be expanded outwards; and the tube expander has the beneficial effect of being convenient to use.

Description

technical field [0001] The invention belongs to the technical field of tube expanders, and relates to a tube expander. Background technique [0002] In the structural parts composed of pipe fittings, such as heat exchangers composed of heat exchange tubes and tube sheets, when the pipe fittings are connected, protrusions need to be provided on the key pipe walls. The traditional technology is to use special molds to process them on a press Or use special oil pressure expansion equipment. The disadvantage of traditional technology is that the processing is complicated and cannot be used for on-site installation. [0003] For the above problems, people have made various improvements, and some have applied for patents. For example, Chinese patent literature discloses a manual pipe expander [application number: 200820212185.2; authorization announcement number: CN201279553Y], It consists of a power part, an expanding tube mold part and a power transmission part. The expanding t...

AI Technical Summary

Problems solved by technology

[0004] The manual pipe expander of this structure includes many parts and complex structure; and the manual pipe expander of this structure, when expanding the pipe, is to use the pipe expander sleeve, the inclined slider of the pipe expander and the pipe expander The pressure head and other structures are inserted into the expanded tube as a whole. After the pressure head of the expanded tube is pushed out by the inclined slider of the expanded tube, there is a problem that it cannot return to its original position in time, that is, there is a problem of jamming, which is inconvenient to use.

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