Accurate butt joint device for hubbed flange and connecting pipe as well as installation and application methods thereof

Abstract

The invention relates to an accurate butt joint device for a hubbed flange and a connecting pipe as well as installation and application methods thereof. The accurate butt joint device comprises a screw rod (1), a tapered plate (2), a pressing sleeve (3) and a chuck (4), wherein the screw rod (1) penetrates through the pressing sleeve (3) and the chuck (4) and is connected with the pressing sleeve(3) and the chuck (4); the tapered plate (2) is connected with the chuck (4); the accurate butt joint device further comprises a handle (5); the handle (5) is mounted at the end part of one end of the screw rod (1); the pressing sleeve (3) moves along the axial direction of the screw rod (1) and the tapered plate (2) moves along the radial direction through rotating the handle (5), and then the tapered plate (2) is clung to and jacked against an inner wall of the hubbed flange (7) and the inner wall of the connecting pipe (6), so that the accurate butt joint of the hubbed flange (7) and the connecting pipe (6) is realized. The accurate butt joint device provided by the invention is novel in structure, easy to manufacture and convenient to move, and also can be connected with a positionerand rolling transmission equipment to realize semiautomatic welding, so that the difficulty of butt joint among the hubbed flange and the connecting pipe, and pipeline parts with the same inner diameter is solved.

Description

technical field [0001] The invention relates to a pipeline and a pressure vessel, in particular to a butt joint device before assembly and welding of a connecting pipe and a flange with a diameter. Background technique [0002] The diameter flange is the most commonly used pipeline connection flange in the manufacture of pressure vessels. One end of the flange is welded to the vessel pipeline, and the other end is connected to the external flange pipeline through bolts. In the manufacturing process, the diameter flange and the connecting pipe are first assembled and welded into an assembly, and then welded with the container. [0003] Welding of flanges with diameter and connecting pipes has the following strict requirements: [0004] Requirement 1: The specifications of the diameter flange and the connecting pipe are matched, and the inner diameter and outer diameter of the two are the same, and no misalignment can occur during the butt joint; [0005] Requirement 2: Due ...

AI Technical Summary

Problems solved by technology

[0008] Difficulty 1: In order to ensure that no misalignment occurs during welding, it is necessary to draw a quartering line at the junction of the connecting pipe and the flange to assist the butt joint, but it is very difficult to distinguish and draw a quartering line at the joint;

[0009] Difficulty 2: Welding gap A is difficult to control and needs to be guaranteed by gaskets. The thickness of gaskets needs to be varied and the operation is cumbersome;

[0010] Difficulty 3: Welding shrinkage deformation will occur during welding, causing the verticality tolerance between the connecting pipe and the flange sealing surface to exceed the range;

[0011] Difficulty 4: When the welding torch is vertically downward, it is the best position for welding, which can ensure the welding quality, but the structure of the flange and the connecting pipe is difficult to keep the welding torch vertical and stable welding

[0012] It can be seen that it is a relatively cumbersome process to ensure that qualified flanges and fittings are welded, and in the manufacture of pressure vessels, a large number of fittings and flanges are required to complete the fittings and fittings efficiently and with quality and quantity. Lan precision docking work is a difficult problem

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