Precise welding tool

Abstract

The utility model discloses a precise welding tool which comprises a bottom plate used for placing a lower pipe plate, two opposite stand columns are arranged on the bottom plate, fixing plates used for fixing pipe fittings are arranged on the opposite faces of the two stand columns, and the connecting line between the two fixing plates intersects with the central axis of the lower pipe plate and is perpendicular to the central axis of the lower pipe plate. A pressing plate which corresponds to the bottom plate and is used for fixing the upper tube plate is arranged at the top end of the stand column, and a plurality of first mounting holes are formed in the pressing plate and the bottom plate. The welding fixture has the advantages that the upper tube plate, the lower tube plate and the barrel are fixed through the bottom plate and the pressing plate, deviation during welding is avoided, the tube is fixed through the stand columns, and accuracy is improved.

Description

Technical Field

[0001] This utility model belongs to the field of welding tooling, and specifically relates to a precision welding tooling. Background Technology

[0002] Welding is a common manufacturing process that can effectively reduce and simplify structural design. However, some equipment requires high precision and flatness in welding, such as heat exchanger welding. Heat exchanger welding involves welding tube sheets to both ends of the shell and two opposing tubes to the side walls of the shell. During tube sheet welding, the heat at the weld is very high, while the heat in the unwelded tube sheet area is low, easily causing the tube sheet to concave and deform. Furthermore, during welding, the stress on the weld point and surrounding points is inconsistent, affecting the parallelism of the tube sheet and its perpendicularity to the shell. When welding tubes, it is necessary to ensure the perpendicularity between the tubes and the shell and the relative positions of the two tubes. Traditional welding methods rely on manual marking and visual inspection, which can easily cause the tubes to tilt after heating, making it difficult to guarantee the perpendicularity between the tubes and the shell.

[0003] Therefore, it is necessary to design a welding fixture to ensure welding accuracy and the flatness of multiple planes, thereby effectively reducing costs and increasing efficiency. Utility Model Content

[0004] The purpose of this invention is to provide a precision welding fixture.

[0005] To achieve the above objectives, this utility model provides the following technical solution:

[0006] A precision welding fixture includes a base plate for placing a lower tube sheet, two opposing columns on the base plate, and fixing plates for fixing tubes on the facing surfaces of the two columns. The line connecting the two fixing plates intersects with and is perpendicular to the central axis of the lower tube sheet. A pressure plate corresponding to the base plate is provided at the top of each column for fixing an upper tube sheet. Both the pressure plate and the base plate are provided with a plurality of first mounting holes.

[0007] Preferably, the first mounting holes are provided in multiple sets to accommodate tube sheets of different diameters.

[0008] Preferably, the fixing plate has a second mounting hole corresponding to the flange on the pipe fitting.

[0009] Preferably, the column has multiple sets of third mounting holes along its height direction for positioning and fixing the plate.

[0010] Preferably, the base plate is rectangular, and the two columns are located at two opposite corners of the base plate.

[0011] Preferably, the base plate and the pressure plate are provided with a number of corresponding fourth mounting holes along the length of the line connecting the two columns.

[0012] Preferably, pre-deformation pads are provided between the bottom plate and the lower tube sheet, and between the pressure plate and the upper tube sheet, and the central axis of the pre-deformation pads is on the same straight line as the central axis of the cylinder.

[0013] Preferably, the bottom of the base plate is provided with a plurality of support blocks.

[0014] The beneficial effects of this utility model are as follows: the verticality of the column and the base plate ensures the position and parallelism of the vertical plane of the equipment interface with the reference; the pressure plate fixes the cylinder, upper tube sheet and lower tube sheet to prevent relative displacement during welding; the fixing plate on the column fixes the pipe fittings to ensure accurate positioning; the pre-deformation pad counteracts the deformation of the upper tube sheet and lower tube sheet during welding; the welding fixture of this utility model has the characteristics of simple operation, high clamping efficiency, good safety, precise assembly and good welding stability. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the structure of this utility model.

[0016] The components are: 1. base plate; 2. column; 3. pressure plate; 4. cylinder; 5. lower tube sheet; 6. upper tube sheet; 7. fixing plate; 8. pipe fittings; 9. flange; 10. pre-deformation gasket; 11. support block. Detailed Implementation

[0017] The technical solution of this patent is further described in detail below in conjunction with specific implementation methods.

[0018] like Figure 1As shown, this utility model discloses a precision welding fixture, including a base plate 1 for placing a lower tube sheet 5. Two opposing columns 2 are mounted on the base plate 1. Fixing plates 7 for fixing tube fittings 8 are mounted on the facing surfaces of the two columns 2. The line connecting the two fixing plates 7 intersects and is perpendicular to the central axis of the lower tube sheet 5. A pressure plate 3, corresponding to the base plate 1, is mounted at the top of each column 2 for fixing an upper tube sheet 6. Both the pressure plate 3 and the base plate 1 have several first mounting holes. Both the base plate 1 and the pressure plate 3 are flat plates. The perpendicularity of the columns 2 to the base plate 1 ensures the positional dimensions and parallelism of the equipment interface's vertical plane with the reference. Bolts are used to... The lower tube plate 5 is fixed through the first mounting hole on the base plate 1, and the upper tube plate 6 is fixed through the first mounting hole on the pressure plate 3 with bolts. The first mounting holes on the pressure plate 3 and the first mounting holes on the base plate 1 correspond one-to-one. The cylinder 4 is placed on the lower tube plate 5, and then the upper tube plate 6 on the pressure plate 3 is placed on the cylinder 4. The position of the pressure plate 3 is fixed by the column 2, so that the upper tube plate 6 and the lower tube plate 5 are aligned. The pressure plate 3 applies downward pressure to the upper tube plate 6, the cylinder 4 and the lower tube plate 5 for fixing, which can effectively prevent the components from tilting or shifting during the welding process. The pipe fittings 8 are fixed on the two columns 2, so that the position of the pipe fittings 8 is fixed, with high precision and not easy to shift.

[0019] Several sets of first mounting holes are provided to accommodate tube sheets of different diameters.

[0020] The fixing plate 7 has a second mounting hole corresponding to the flange 9 on the pipe fitting 8; the position of the pipe fitting 8 is fixed by connecting the fixing plate 7 and the flange 9 with high precision. By enlarging the fixing plate 7 and opening multiple sets of second mounting holes, pipe fittings 8 of different diameters can be installed.

[0021] The column 2 has multiple sets of third mounting holes along its height direction for positioning the fixing plate 7. The vertical position of the fixing plate 7 can be adjusted through the multiple sets of third mounting holes to meet the multiple size designs of the cylinder 4 in the interface height direction.

[0022] The base plate 1 is rectangular, and two columns 2 are set at two opposite corners of the base plate 1 to maintain the balance of the pressure plate 3. For the same diameter lower tube plate 5, setting the columns 2 at the corners can reduce the area of ​​the base plate 1, resulting in low space occupancy, less material usage, and resource conservation.

[0023] Several corresponding fourth mounting holes are provided on the base plate 1 and the pressure plate 3 along the length of the line connecting the two columns 2; the distance between the two columns 2 can be changed through multiple fourth mounting holes, so as to adapt to pipes 8 of different lengths and make the welded part of the pipe 8 fit with the position of the cylinder 4.

[0024] Pre-deformation pads 10 are provided between the bottom plate 1 and the lower tube sheet 5, and between the pressure plate 3 and the upper tube sheet 6. The central axis of the pre-deformation pad 10 is on the same straight line as the central axis of the cylinder 4. Since the welding between the tube sheet and the cylinder 4 is a fillet weld, the edge of the tube sheet is stressed, while the center is far from the welding area and the stress is very small. This can easily cause the edge of the tube sheet to bend and deform towards the cylinder 4, and the center of the tube sheet to protrude outward. By setting a pre-deformation plate at the center of the tube sheet, during the installation of the pressure plate 3, the pre-deformation plate applies a force to the tube sheet, causing the center of the tube sheet to be concave towards the cylinder 4, which is used to counteract the outward protrusion of the center of the tube sheet during welding, so that the tube sheet remains flat after welding.

[0025] The bottom of the base plate 1 is provided with several support blocks 11, which support the base plate 1 and keep the base plate 1 at a certain distance from the ground, so as to facilitate the installation of bolts to fix the lower tube plate 5.

[0026] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0027] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A precision welding fixture, characterized in that: The system includes a base plate (1) for placing the lower tube sheet (5), on which two opposing columns (2) are provided. On the facing surfaces of the two columns (2) are fixing plates (7) for fixing the pipe fittings (8). The line connecting the two fixing plates (7) intersects with and is perpendicular to the central axis of the lower tube sheet (5). At the top of the column (2) is a pressure plate (3) corresponding to the base plate (1) for fixing the upper tube sheet (6). Both the pressure plate (3) and the base plate (1) are provided with several first mounting holes.

2. The precision welding fixture according to claim 1, characterized in that: The first mounting holes are provided in multiple sets to accommodate tube sheets of different diameters.

3. The precision welding fixture according to claim 1, characterized in that: The fixing plate (7) has a second mounting hole corresponding to the flange (9) on the pipe fitting (8).

4. The precision welding fixture according to claim 1, characterized in that: The column (2) has multiple sets of third mounting holes along its height direction for positioning and fixing the plate (7).

5. The precision welding fixture according to claim 1, characterized in that: The base plate (1) is rectangular, and the two columns (2) are located at two opposite corners of the base plate (1).

6. The precision welding fixture according to claim 1, characterized in that: Several corresponding fourth mounting holes are provided on the base plate (1) and the pressure plate (3) along the length of the line connecting the two columns (2).

7. The precision welding fixture according to claim 1, characterized in that: The top surface of the base plate (1) and the bottom surface of the pressure plate (3) are provided with pre-deformation pads (10), and the central axes of the two pre-deformation pads (10), the central axis of the upper tube plate (6) and the central axis of the lower tube plate (5) are all located on the same straight line.

8. The precision welding fixture according to claim 1, characterized in that: The bottom of the base plate (1) is provided with several support blocks (11).

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