Calibration platform for bending and tailor-welding snake-shaped heat exchange tube

Abstract

The utility model relates to a calibration platform for bending and tailor-welding a snakelike heat exchange pipe, which is characterized in that pipe end positioning parts are respectively arranged on a left table top and a right table top, so that pipe end positioning is performed on a snakelike heat exchange pipe section in advance before welding, and the position of the end part of the welded snakelike heat exchange pipe meets the requirement of butt joint with a pipe joint on a header. Meanwhile, the positioning rake is used for positioning the middle portion of the snake-shaped heat exchange pipe section, deformation of the middle portion of the snake-shaped heat exchange pipe in the welding process is eliminated, and influence on assembly of other adjacent snake-shaped heat exchange pipes due to welding deformation of the snake-shaped heat exchange pipe is eliminated. And the welding area is arranged between the left table top and the right table top, so that workers can conveniently conduct circumferential ring welding on the snakelike heat exchange tube, and the welding quality is improved.

Description

Technical Field

[0001] The utility model relates to a serpentine heat exchange tube bending and welding calibration platform. Background Art

[0002] A large number of serpentine heat exchange tubes are arranged in the horizontal high-pressure heater. The serpentine heat exchange tubes can effectively increase the density of the heat exchange tubes and reduce the volume of the high-pressure heater. The serpentine heat exchange tubes are used to connect the headers at both ends of the high-pressure heater. Due to the large number of serpentine heat exchange tubes, dense connecting joints are formed on the outer peripheral surface of the header. Each heat exchange tube has a corresponding joint docking. If the shape deviation of the serpentine heat exchange tube is large, it will cause the end of the heat exchange tube to not dock with the joint on the header during welding. At this time, the operator will usually forcibly twist the heat exchange tube to make the end of the heat exchange tube form a docking relationship with the corresponding joint on the header, and then weld it. However, the heat exchange tubes welded in this way have stress that cannot be released. Over time, it will cause cracks in the welded joints, affecting the safe use of the high-pressure heater.

[0003] Therefore, the requirements for the outer dimensions of the serpentine heat exchange tube are very high. The shorter serpentine heat exchange tube is positioned by the equipment during the bending process, so its outer dimensions can be guaranteed. However, the longer serpentine heat exchange tube will be divided into two or three sections due to transportation needs. The divided serpentine heat exchange tube sections are connected in the user's workshop. If there is no positioning device at this time, it is difficult to ensure that the outer dimensions of the complete serpentine heat exchange tube meet the requirements after the serpentine heat exchange tube sections are connected, and it is easy to cause the problem that the above-mentioned heat exchange tube head cannot be aligned with the pipe joint on the header. Utility Model Content

[0004] The technical problem to be solved by the utility model is to provide a serpentine heat exchange tube bending and welding calibration platform to solve the technical problem that the external dimensions of the serpentine heat exchange tube sections after welding are difficult to meet the requirements.

[0005] In order to solve the above technical problems, the technical solution adopted by the utility model is: a serpentine heat exchange tube bending and welding calibration platform, including a left table and a right table that are separated from each other, the left table and the right table are of the same height and the upper surfaces are flat, and an annular tube end positioning part is respectively arranged on the left table and the right table, and any tube end positioning part is formed by a plurality of positioning plates arranged along the circumferential direction, and a tube end positioning groove matching the outer diameter of the end of the heat exchange tube is formed between two adjacent positioning plates, and a plurality of positioning rakes perpendicular to the axial direction of the heat exchange tube are also connected to the left table and the right table respectively. A plurality of middle positioning grooves are arranged along the length direction of the positioning rake on the upper edge. Any serpentine heat exchange tube corresponds to a middle positioning groove of at least one positioning rake on the left table and the right table, and the two ends of the serpentine heat exchange tube correspond to a tube end positioning groove on the left table and the right table, respectively. The two sides of the left table and the right table are connected to each other by a connecting beam, and the gap area between the left table and the right table is a welding area. The tube end positioning portion is arranged on a circular pad, and the thickness of the pad is equal to the distance from the bottom of the middle positioning groove to the lower edge of the positioning rake.

[0006] As a preferred solution, a plurality of positioning rakes are arranged on the edge of the left table surface close to the right table surface, and a plurality of positioning rakes are also arranged on the edge of the right table surface close to the left table surface.

[0007] As a preferred solution, two cross-arranged support beams are provided between the left table top and the right table top, and two ends of any support beam are respectively connected to two connection beams.

[0008] As a preferred solution, two parallel supporting beams are also provided in the welding area. The two supporting beams are arranged on both sides of the two supporting beams and connected to the ends of the two supporting beams. Two connecting beams parallel to the connecting beams are arranged between the left table top and the adjacent supporting beams, and two connecting beams parallel to the connecting beams are also arranged between the right table top and the adjacent supporting beams. Positioning rakes extending along their length directions are also arranged on the two supporting beams.

[0009] The beneficial effects of the utility model are as follows: the utility model arranges the tube end positioning parts on the left table and the right table respectively, so that the tube ends of the serpentine heat exchange tube segments are pre-positioned before welding, ensuring that the position of the ends of the serpentine heat exchange tubes after welding meets the requirements for docking with the pipe joints on the header. At the same time, the utility model also uses a positioning rake to position the middle part of the serpentine heat exchange tube segment, eliminating the deformation of the middle part of the serpentine heat exchange tube during welding, and eliminating the influence of welding deformation of the serpentine heat exchange tube on the assembly of other adjacent serpentine heat exchange tubes. The welding area is arranged between the left table and the right table, which facilitates the workers to perform circumferential ring welding of the serpentine heat exchange tubes and improves the welding quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] The specific implementation of the utility model is further described in detail below with reference to the accompanying drawings, wherein:

[0011] Figure 1 It is a structural schematic diagram of the utility model;

[0012] Figure 2 It is a structural schematic diagram of the pipe end positioning part of the utility model;

[0013] Figure 3 It is a structural schematic diagram of the positioning rake of the utility model;

[0014] Figure 4 It is a structural schematic diagram of the serpentine heat exchange tube being calibrated and welded on the platform of the utility model;

[0015] Figure 1~Figure 3 Center: 1. Left table, 2. Right table, 3. Pipe end positioning part, 4. Positioning plate, 5. Pipe end positioning groove, 6. Positioning rake, 7. Middle positioning groove, 8. Connecting beam, 9. Welding area, 10. Support beam, 11. Support beam, 12. Connecting beam, 13. Pad, 14. Serpentine heat exchange tube. DETAILED DESCRIPTION

[0016] The specific implementation scheme of the utility model is described in detail below in conjunction with the accompanying drawings.

[0017] like Figure 1~Figure 3 The serpentine heat exchange tube bending and welding calibration platform shown in the figure comprises a left table top 1 and a right table top 2 which are arranged apart from each other. The left table top 1 and the right table top 2 are of the same height and have flat upper surfaces. An annular tube end positioning portion 3 is respectively arranged on the left table top 1 and the right table top 2. Any tube end positioning portion 3 is formed by a plurality of positioning plates 4 arranged along the circumferential direction. A tube end positioning groove 5 which matches the outer diameter of the end of the heat exchange tube is formed between two adjacent positioning plates 4. A plurality of positioning rakes 6 which are perpendicular to the axial direction of the heat exchange tube are respectively connected to the left table top 1 and the right table top 2. A plurality of positioning rakes 6 which are perpendicular to the axial direction of the heat exchange tube are opened on the upper edge of the positioning rake 6 along its length. The middle positioning grooves 7 are arranged in the direction of each other, any serpentine heat exchange tube corresponds to a middle positioning groove 7 of at least one positioning rake 6 on the left table 1 and the right table 2, and the two ends of the serpentine heat exchange tube correspond to a tube end positioning groove 5 on the left table 1 and the right table 2, respectively. The two sides of the left table 1 and the right table 2 are connected to each other by a connecting beam 8, and the empty area between the left table 1 and the right table 2 is a welding area 9. The tube end positioning portion 3 is arranged on a circular pad 13, and the thickness of the pad 13 is equal to the distance from the bottom of the middle positioning groove 7 to the lower edge of the positioning rake 6.

[0018] The serpentine heat exchange tube 14 described in this embodiment is roughly "S"-shaped, and a plurality of positioning rakes 6 are respectively arranged on the left table 1 and the right table 2, each positioning rake 6 is arranged on a straight section of the serpentine heat exchange tube 14, and the number of the middle positioning grooves 7 on the positioning rake 6 is adjusted according to actual needs to correspond one-to-one with the serpentine heat exchange tube 14.

[0019] The more the number of positioning rakes 6 is, the more accurate the positioning of the serpentine heat exchange tube is. The serpentine heat exchange tube is not suitable for setting the positioning rakes 6 at the position where the bending part is in an arc shape.

[0020] A plurality of positioning rakes 6 are arranged on the edge of the left table top 1 close to the right table top 2 , and a plurality of positioning rakes 6 are also arranged on the edge of the right table top 2 close to the left table top 1 .

[0021] The sides where the left table top 1 and the right table top 2 are close to each other are the straight sections of the serpentine heat exchange tube 14. Therefore, arranging a positioning rake 6 here can better locate the direction of the serpentine heat exchange tube 14 in the welding area 9, so that the two butt ends of the serpentine heat exchange tube to be welded in the welding area 9 can be butt-jointed more accurately.

[0022] As a further improvement of the above technical solution, in this embodiment, two cross-arranged support beams 10 are arranged between the left table top 1 and the right table top 2, and the two ends of any support beam 10 are respectively connected to two connecting beams 8 to improve the overall stability of the platform and alleviate the downward disturbance of the serpentine heat exchange tube in the welding area 9.

[0023] In this embodiment, two parallel supporting beams 11 are further provided in the welding area 9. The two supporting beams 11 are arranged on both sides of the two supporting beams 10 and are connected to the ends of the two supporting beams 10. Two connecting beams 12 parallel to the connecting beam 8 are provided between the left table top 1 and the adjacent supporting beam 11. Two connecting beams 12 parallel to the connecting beam 8 are also provided between the right table top 2 and the adjacent supporting beam 11. Positioning rakes 6 extending along their length directions are also provided on the two supporting beams 11.

[0024] The two supporting beams 11 and the positioning rake 6 arranged thereon further improve the positioning accuracy of the serpentine heat exchange tube section to be welded, and at the same time improve the support of the serpentine heat exchange tube 14 in the welding area 9. The connecting beam 12 can improve the strength and stability of the entire platform.

[0025] The working process of this utility model is: Figure 4 As shown, firstly, the tube end positioning grooves 5 are numbered according to the numbers of the serpentine heat exchange tubes 14, and then the two ends of the serpentine heat exchange tube segments to be welded are placed on the left table 1 and the right table 2 according to the numbers, so that the two ends of the serpentine heat exchange tube 14 are respectively clamped in the corresponding tube end positioning grooves 5, and the position of the serpentine heat exchange tube 14 segments is adjusted so that the serpentine heat exchange tube segments are embedded in the multiple corresponding middle positioning grooves 7 on the left table 1 and the right table 2 in a stress-free state, so that the serpentine heat exchange tube to be butt jointed is aligned in the welding area 9. After that, the workers can weld the serpentine heat exchange tube. During the welding process, the serpentine heat exchange tube is always limited by the positions of the multiple middle positioning grooves 7, so that it maintains a shape that meets the assembly requirements. After the welding is completed and cooled, the workers can install this serpentine heat exchange tube 14 on the real high-pressure heater header.

[0026] The numbering of the tube end positioning groove 5 is determined according to the actual installation position of the serpentine heat exchange tube 14. Therefore, the position where the serpentine heat exchange tube 14 is positioned on the platform is the position where it is welded to the header in the high-pressure heater, and the tube end positioning groove 5 on the annular tube end positioning portion 3 simulates the specific positions of each pipe joint on the actual header.

[0027] The above embodiments are only illustrative of the principles and effects of the invention, as well as some embodiments of its application, and are not intended to limit the invention. It should be pointed out that a person skilled in the art can make several modifications and improvements without departing from the inventive concept of the invention, and all of these belong to the protection scope of the invention.

Claims

1. A serpentine heat exchange tube bending and welding calibration platform, It is characterized in that The heat exchange tube comprises a left table top (1) and a right table top (2) which are arranged apart from each other. The left table top (1) and the right table top (2) are of the same height and have flat upper surfaces. The left table top (1) and the right table top (2) are respectively provided with an annular tube end positioning portion (3). Each tube end positioning portion (3) is formed by a plurality of positioning plates (4) arranged in a circumferential direction. A tube end positioning groove (5) which matches the outer diameter of the end of the heat exchange tube is formed between two adjacent positioning plates (4). The left table top (1) and the right table top (2) are also respectively connected with a plurality of positioning rakes (6) which are perpendicular to the axial direction of the heat exchange tube. The upper edge of the positioning rake (6) is provided with a plurality of middle positioning grooves (7) arranged in the length direction thereof. Any serpentine heat exchange tube corresponds to a middle positioning groove (7) of at least one positioning rake (6) on the left table (1) and the right table (2), and the two ends of the serpentine heat exchange tube correspond to a tube end positioning groove (5) on the left table (1) and the right table (2), respectively. The two sides of the left table (1) and the right table (2) are connected to each other by a connecting beam (8), and the gap area between the left table (1) and the right table (2) is a welding area (9). The tube end positioning portion (3) is arranged on a circular pad (13), and the thickness of the pad (13) is equal to the distance from the bottom of the middle positioning groove (7) to the lower edge of the positioning rake (6).

2. According to the serpentine heat exchange tube bending and welding calibration platform of claim 1, It is characterized in that A plurality of positioning rakes (6) are arranged on the edge of the left table top (1) close to the right table top (2), and a plurality of positioning rakes (6) are also arranged on the edge of the right table top (2) close to the left table top (1).

3. The serpentine heat exchange tube bending and welding calibration platform according to claim 1, It is characterized in that Two cross-arranged support beams (10) are provided between the left table top (1) and the right table top (2), and two ends of any support beam (10) are respectively connected to two connection beams (8).

4. The serpentine heat exchange tube bending and welding calibration platform according to claim 3, It is characterized in that Two parallel supporting beams (11) are also arranged in the welding area (9). The two supporting beams (11) are arranged on both sides of the two supporting beams (10) and are connected to the ends of the two supporting beams (10). Two connecting beams (12) parallel to the connecting beams (8) are arranged between the left table (1) and the adjacent supporting beam (11). Two connecting beams (12) parallel to the connecting beams (8) are also arranged between the right table (2) and the adjacent supporting beam (11). Positioning rakes (6) extending along the length direction of the two supporting beams (11) are also arranged.

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