CN214109410U

CN214109410U - Pipe head positioning device

Info

Publication number: CN214109410U
Application number: CN202021995434.7U
Authority: CN
Inventors: 张鹰; 王麒; 杨有福; 苏厚德; 朱晓钢; 唐永飞; 俞禄沅
Original assignee: Shanghai Lanbin Petrochemical Equipment Co Ltd; Lanzhou Petroleum Machinery Research Institute
Current assignee: Shanghai Lanbin Petrochemical Equipment Co Ltd; Lanzhou Petroleum Machinery Research Institute
Priority date: 2020-09-14
Filing date: 2020-09-14
Publication date: 2021-09-03
Anticipated expiration: 2030-09-14

Abstract

A tube head positioning device comprises a steel needle carrier, wherein a pull ring is arranged on the upper end face of the steel needle carrier, and a plurality of steel needles are uniformly arranged on the lower end face of the steel needle carrier. The steel needle is of a conical structure, the large end of the conical structure is connected with the steel needle carrier, and the small end of the conical structure is in contact with a processed workpiece. The utility model discloses an extremely simple device has solved tube head (heat exchange tube and tube sheet fillet weld) welding seam group to the inhomogeneous problem in clearance, is favorable to improving the welding quality of heat exchange tube and tube sheet. Can effectively ensure the root of the tube head to be melted through, and avoids the possibility of air holes in the welding process of the tube head.

Description

Pipe head positioning device

Technical Field

The utility model belongs to the technical field of pressure vessel tube head (heat exchange tube and tube sheet fillet weld) welding, tube head positioner when concretely relates to heat exchange tube and tube sheet welding.

Background

In the heat exchanger used in industrial production, the heat exchange tube and the tube plate basically adopt a strength welding structure with good sealing performance to ensure the performance of equipment, and the common welding of the heat exchange tube and the tube plate comprises manual argon tungsten-arc welding and numerical control pulse argon tungsten-arc welding, and when the heat exchange tube and the tube plate are assembled according to the requirements of design documents, the uniform clearance between the outer wall of the heat exchange tube and the hole of the tube plate must be ensured, but in the actual tube head assembling process, the following conditions often occur:

1: after the heat exchange tube penetrates into the tube plate hole, the natural clearance between the outer wall of the heat exchange tube and the lower part of the tube plate hole is reduced due to the gravity action of the heat exchange tube, and the uniform clearance between the heat exchange tube and the tube plate cannot be ensured;

2: in the process of positioning and welding the tube head, when a welding machine penetrates into the heat exchange tube, the heat exchange tube is easy to slide on the inner wall of the hole of the tube plate to generate displacement, so that the gap between the heat exchange tube and the tube plate is not uniform;

3: when the heat exchange tube is welded in a point-fixed mode, the outer wall of the tube has larger eccentricity of a gap of the heat exchange tube due to the action of heat input; the welding quality is not good;

the three conditions that the gap between the outer wall of the heat exchange tube and the inner wall of the tube plate hole is not uniform directly influence the welding quality of the welding seam of the tube head.

SUMMERY OF THE UTILITY MODEL

To the above problem, the utility model aims to provide a guarantee the even frock in clearance between heat exchange tube outer wall and tube sheet hole, solve the quality problems that heat exchange tube and tube sheet equipment clearance are inhomogeneous to lead to.

The utility model discloses a solve above-mentioned technical problem through following technical scheme:

a tube head positioning device comprises a steel needle carrier, wherein a pull ring is arranged on the upper end face of the steel needle carrier, and a plurality of steel needles are uniformly arranged on the lower end face of the steel needle carrier.

The steel needle is of a conical structure, the large end of the conical structure is connected with the steel needle carrier, and the small end of the conical structure is in contact with a processed workpiece.

The utility model adopts an extremely simple device to solve the difficult problems encountered in the tube head welding process, can simply and effectively solve the quality problem of the assembly of the heat exchange tube and the tube plate which are not concentric, is beneficial to improving the welding quality of the heat exchange tube and the tube plate, can effectively ensure the root of the tube head to be melted through, and avoids the possibility of air holes in the tube head welding process; the steel needle of the tube head positioner part is embedded into the gap between the outer wall of the heat exchange tube and the hole of the tube, and the heat exchange tube is acted by supporting force from all sides around, so that the uniformity of the gap is kept between the heat exchange tube and the hole of the tube in any direction, namely the concentricity of the heat exchange tube and the hole of the tube is ensured. In the welding process, the introduced protective gas Ar can stably escape from the uniform gap between the heat exchange tube and the tube hole, so that the possibility that the Ar gas expands when heated, escapes in time and generates air holes in a welding line is avoided; meanwhile, the uniform gap can ensure that the root of the welding seam of the tube head is uniformly melted through in the process of stable combustion of the welding arc, and has a great effect on improving the welding quality of the heat exchange tube and the tube plate; moreover, the tool is simple in structure, saves materials, and is easy to realize in batch production and manufacturing.

Drawings

Fig. 1 is a schematic perspective view of the present invention.

Detailed Description

The following detailed description of the embodiments of the present invention is provided with reference to the accompanying drawings:

referring to fig. 1, a pipe head positioning device comprises a steel needle carrier 1, a plurality of steel needles 2 and a pull ring 3; the steel needle carrier 1 is a circular ring with a certain thickness, the steel needles have higher rigidity and are uniformly distributed on the outer edge of the lower end face of the steel needle carrier, and the pull ring is connected to the upper end face of the steel needle carrier and used for tool extraction.

The steel needle 2 is a conical structure, the large end of the conical structure is connected with the steel needle carrier 1, the small end of the conical structure is in contact with a processed workpiece, namely the small end of the conical structure is simultaneously pushed into a gap between the heat exchange tube and the tube plate until the side face of the steel needle is in close contact with the heat exchange tube and the hole of the tube plate, and therefore the gap nonuniformity caused by gravity or deformation of the heat exchange tube is eliminated.

Rubber pads 4 are installed between a plurality of steel needles of the lower terminal surface department of steel needle carrier 1, play the effect of buffering, can prevent that the steel needle from damaging the heat exchange tube tip at the in-process that imbeds heat exchange tube and tube hole clearance.

The specification of the steel needle is set according to different specifications of the heat exchange tube, and the small end side face of the conical steel needle is ensured to be in close contact with the heat exchange tube and a tube plate hole in the heat exchange tube with any specification; according to the practical operation demonstration test, the sizes of the locators for determining the matching of the common heat exchange tubes are shown in the following table:

the utility model discloses a working process: firstly, pushing steel needles into a gap between a heat exchange tube and a tube plate, when the three steel needles are simultaneously in close contact with the inner wall of a tube plate hole and the outer wall of the heat exchange tube, performing positioning welding on the tube head by adopting numerical control pulse argon tungsten-arc welding (avoiding the positions of the steel needles during the positioning welding), and after the positioning welding is finished, pulling out a tool by means of a pull ring; the next tube head is positioned in the same way. And circulating in this way, finishing the positioning welding operation of the tube head on the whole tube plate surface, and then carrying out bottoming, filling and cover surface welding by adopting a numerical control pulse tungsten argon arc welding machine according to given parameters to ensure the height of the welding angle of the tube head.

Claims

1. A tube head positioning device is characterized by comprising a steel needle carrier (1), wherein a pull ring (3) is arranged on the upper end surface of the steel needle carrier, and a plurality of steel needles (2) are uniformly arranged on the lower end surface of the steel needle carrier; the steel needle (2) is of a conical structure, the large end of the conical structure is connected with the steel needle carrier (1), and the small end of the conical structure is in contact with a processed workpiece.

2. A pipe head positioning device according to claim 1, characterized in that rubber pads (4) are mounted between the steel needles at the lower end face of the steel needle carrier (1).