Positioning clamp of all-position tube plate automatic welding machine

Abstract

The utility model provides an all-position tube plate automatic welding machine positioning clamp, which comprises a positioning seat and a limiting plate, the positioning seat is cylindrical, the positioning seat is used for supporting and positioning a heat exchange tube to be welded and a flange tube plate assembly, the limiting plate is connected with the positioning seat, the limiting plate is of an arc-shaped structure, and the limiting plate is connected with the positioning seat. The axial lead of the limiting plate coincides with the axial lead of the positioning seat, the outer diameter of the limiting plate is sequentially reduced in the length direction of the axial lead of the limiting plate, the small-caliber end of the limiting plate is connected with the positioning seat, and a positioning part is formed at the joint of the limiting plate and the positioning seat. The end portion of the heat exchange tube to be welded abuts against the positioning portion, the outer arc face of the limiting plate is further provided with a limiting portion, and the limiting portion is used for limiting the appearance of the positioning clamp so as to control the appearance outline of the whole positioning clamp not to interfere with other components such as a nozzle of an automatic welding gun of an all-position tube plate. The end face, away from the positioning base, of the limiting plate is further provided with a mounting part used for being connected with a welding machine base. The welding device has the advantages that the heat exchange tube can be quickly and accurately positioned, the welding precision, efficiency and quality are improved, the welding device can be suitable for three tube arrangement modes of tube extension, tube alignment or tube shrinkage, the welding flexibility is improved, and the welding device is simple in structure and convenient to operate and has wide applicability and popularization value.

Description

Technical Field

[0001] The utility model relates to the field of welding equipment, in particular to a positioning fixture for an all-position tube-plate automatic welding machine. Background Art

[0002] The all-position tube-sheet automatic welder is a fast, accurate, automated welding device designed specifically for heat exchangers. It can weld tube-sheet joints made of carbon steel, stainless steel, and other materials in three different pipe layouts: extended, flush, or indented, with or without filler wire, either horizontally or vertically. With high reproducibility, it can weld these joints with materials like carbon steel and stainless steel in three different pipe layouts: horizontally or vertically placed. To improve equipment utilization and input-output ratio, using the same all-position tube-sheet automatic welder to weld various specifications of heat exchange tube-sheet joints presents problems such as inaccurate positioning, complex operation, and a narrow range of applicability, seriously impacting welding efficiency and quality. Existing technology makes it impossible to quickly replace positioning fixtures to achieve all-position welding for tube-sheet welds in heat exchangers of various specifications. Furthermore, weld quality and welding position are affected by the assembly accuracy of the positioning fixture and the heat exchange tubes, resulting in inconvenient operation and inaccurate positioning. Utility Model Content

[0003] In view of the shortcomings of the prior art described above, the purpose of the present invention is to provide a positioning fixture for an all-position tube-sheet automatic welding machine, which is used to solve the technical problems in the prior art that the positioning fixture cannot be quickly replaced, and the weld quality and welding position are affected by the assembly accuracy of the positioning fixture and the heat exchange tube, resulting in inconvenient operation and inaccurate positioning.

[0004] To achieve the above-mentioned and other related purposes, the present invention provides a positioning fixture for an all-position tube-to-sheet automatic welding machine, comprising:

[0005] A positioning seat, which is cylindrical and used to support and position the heat exchange tube to be welded and the flange tube sheet assembly;

[0006] A limiting plate, the limiting plate is connected to the positioning seat, the limiting plate is an arc-shaped structure, the axis of the limiting plate coincides with the axis of the positioning seat, the outer diameter of the limiting plate decreases along the length direction of its axis, and the small-diameter end of the limiting plate is connected to the positioning seat;

[0007] A positioning portion is formed at the connection between the limiting plate and the positioning seat, and the end of the heat exchange tube to be welded abuts against the positioning portion. A limiting portion is also provided on the outer arc surface of the limiting plate, and the limiting portion is used to limit the outer shape of the positioning fixture;

[0008] The end surface of the limiting plate away from the positioning seat is further provided with a mounting portion, and the mounting portion is used to be connected to the welding machine base.

[0009] The advantage of adopting the above technical solution is that the assembled heat exchange tube to be welded and the heat exchange tube sleeve of the flange tube sheet assembly are placed on the positioning seat, and its end is against the positioning part to complete the rapid and precise positioning. This process greatly improves the welding accuracy, efficiency and quality. At the same time, it can be applied to three pipe layout methods: pipe extension, pipe flushing or pipe inward shrinkage, and the positioning fixture can be quickly replaced through the installation part, which improves the flexibility of welding. It has a simple structure, easy operation, and has wide applicability and promotion value.

[0010] Optionally, the central angle of the limiting plate is less than 90°.

[0011] Optionally, a heat dissipation slope is further provided on the end surface of the positioning seat close to the limiting plate.

[0012] Optionally, the inner arc surface of the limiting plate is provided with a first heat dissipation step, a second heat dissipation step and a third heat dissipation inclined surface in sequence along the length direction of its axis, the first heat dissipation step is close to the positioning seat, and the third heat dissipation inclined surface is close to the mounting portion.

[0013] Optionally, the outer diameter of the limiting portion can be determined according to the size of the welding gun head and the nozzle, so as to prevent the gun from being blocked during the welding process due to the outer diameter of the positioning fixture being too large.

[0014] Optionally, the limiting portion and the mounting portion are inclined to transition to form a transition slope, and the transition slope is arranged to face away from the third heat dissipation slope.

[0015] Optionally, the end of the positioning seat away from the limiting plate is further provided with a chamfer.

[0016] Optionally, a plurality of mounting holes are provided on the end surface of the limiting plate away from the positioning seat, and the mounting holes are evenly distributed along the end surface of the large opening of the limiting plate, and all the mounting holes form the mounting portion.

[0017] Optionally, one end of the mounting hole is connected to the end face of the large end of the limiting plate, the other end of the mounting hole is located on the transition slope, and the center line of the mounting hole is parallel to the axial center line of the limiting plate.

[0018] Optionally, the positioning seat and the limiting plate are integrally formed.

[0019] Optionally, the positioning seat and the limiting plate are made of copper.

[0020] As described above, the utility model is an all-position tube sheet automatic welding machine positioning fixture, which has the following beneficial effects: it can quickly and accurately position the heat exchange tube, improve the welding accuracy, efficiency and quality, and is suitable for three pipe layout methods: tube extension, tube flush or tube inward shrinkage, and the positioning fixture can be quickly replaced through the installation part, which improves the flexibility of welding. It has a simple structure, is easy to operate, and has wide applicability and promotion value. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 Shown is a schematic structural diagram of a first perspective of an embodiment of the present invention;

[0022] Figure 2 Shown is a structural schematic diagram of a second viewing angle in one embodiment of the present invention.

[0023] Part Number Description

[0024] 1 Positioning seat

[0025] 101 Positioning Department

[0026] 102 Limiting part

[0027] 103 Transition slope

[0028] 104 heat dissipation slope

[0029] 2 limit plates

[0030] 201 First Cooling Step

[0031] 202 Second heat dissipation step

[0032] 203 Third heat dissipation slope

[0033] 3. Installation

[0034] 301 mounting hole DETAILED DESCRIPTION

[0035] The following describes the embodiments of the present invention through specific examples. Those skilled in the art will readily understand the other advantages and benefits of the present invention from the disclosure herein. The present invention may also be implemented or applied through various other specific embodiments, and the details in this specification may be modified or altered based on different perspectives and applications without departing from the spirit of the present invention.

[0036] See also Figures 1 to 2. It should be noted that the illustrations provided in this embodiment only illustrate the basic concept of the present invention in a schematic manner. The illustrations only show the components related to the present invention rather than being drawn according to the number, shape and size of the components during actual implementation. During implementation, the type, quantity and proportion of each component can be changed at will, and the component layout may also be more complex. The structures, proportions, sizes, etc. illustrated in the drawings of this specification are only used to match the contents disclosed in the specification for people familiar with this technology to understand and read. They are not used to limit the conditions under which the present invention can be implemented, so they have no technical significance. Any structural modification, change in proportional relationship or adjustment of size should still fall within the scope of the technical content disclosed in the present invention without affecting the efficacy and purpose that can be achieved by the present invention. At the same time, the terms such as "upper", "lower", "left", "right", "middle" and "one" quoted in this specification are only for the convenience of description and are not used to limit the scope of implementation of the present invention. Changes or adjustments to their relative relationships should also be regarded as the scope of implementation of the present invention without substantially changing the technical content.

[0037] See Figures 1 to 2 As shown, the utility model provides a positioning fixture for an all-position tube-to-sheet automatic welding machine, comprising:

[0038] Positioning seat 1, the positioning seat 1 is cylindrical and is used to support and position the heat exchange tube to be welded and the flange tube sheet assembly;

[0039] The limiting plate 2 is connected to the positioning seat 1. The limiting plate 2 is an arc-shaped structure. The axis of the limiting plate 2 coincides with the axis of the positioning seat 1. The outer diameter of the limiting plate 2 decreases along the length direction of its axis. The small-diameter end of the limiting plate 2 is connected to the positioning seat 1.

[0040] A positioning portion 101 is formed at the connection between the limiting plate 2 and the positioning seat 1. The end of the heat exchange tube to be welded abuts against the positioning portion 101. A limiting portion 102 is also provided on the outer arc surface of the limiting plate 2. The limiting portion 102 is used to limit the outer shape of the positioning fixture to control the outer contour of the entire positioning fixture from interfering with other components such as the nozzle of the full-position tube sheet automatic welding gun;

[0041] The end surface of the limiting plate 2 away from the positioning seat 1 is further provided with a mounting portion 3, and the mounting portion 3 is used to be connected to the welding machine base.

[0042] Exemplarily, the central angle of the limiting plate 2 is less than 90°, which reduces the shielding area of ​​the limiting plate 2 and provides a larger operating space for welding.

[0043] It should also be noted that the outer diameter of the positioning seat 1 in the present application can be adjusted according to the specifications of the heat exchange tube to be welded.

[0044] Exemplarily, a heat dissipation slope 104 is further provided on the end surface of the positioning seat 1 close to the limiting plate 2 .

[0045] It should also be noted that the inclined surface is provided to increase the surface area, which is used to accelerate the heat dissipation during welding.

[0046] Exemplarily, the inner arc surface of the limiting plate 2 is provided with a first heat dissipation step 201, a second heat dissipation step 202 and a third heat dissipation slope 203 in sequence along the length direction of its axis, the first heat dissipation step 201 is close to the positioning seat 1, and the third heat dissipation slope 203 is close to the mounting part 3.

[0047] It should also be noted that multi-stage heat dissipation is achieved through the first heat dissipation step 201 , the second heat dissipation step 202 and the third heat dissipation inclined surface 203 .

[0048] For example, the outer diameter of the limiting portion 102 can be determined according to the size of the welding gun head and the nozzle, so as to prevent the gun from being blocked during the welding process due to the outer diameter of the positioning fixture being too large.

[0049] Exemplarily, the limiting portion 102 and the mounting portion 3 are inclined to transition to form a transition slope 103 , and the transition slope 103 is arranged to face back to back with the third heat dissipation slope 203 .

[0050] Exemplarily, the end of the positioning seat 1 away from the limiting plate 2 is further provided with a chamfer.

[0051] It should also be noted that the function of the chamfer is to provide guidance when the heat exchange tube to be welded is arranged on the positioning seat 1 to avoid collision.

[0052] Exemplarily, a plurality of mounting holes 301 are provided on the end surface of the limiting plate 2 away from the positioning seat 1 , and the mounting holes 301 are evenly distributed along the end surface of the large opening of the limiting plate 2 .

[0053] It should also be noted that by providing multiple mounting holes 301 to connect the welding machine base, it is ensured that the positioning fixture of the present application can rotate synchronously with the welding machine base, and welding does not require additional tooling, thereby ensuring welding quality.

[0054] It is further explained that the transition slope 103 provides a basis for the length of the mounting hole 301, so that the mounting hole 301 can ensure connection strength and stability when connected.

[0055] Exemplarily, one end of the mounting hole 301 is connected to the large end face of the limiting plate 2 , the other end of the mounting hole 301 is located on the transition slope 103 , and the center line of the mounting hole 301 is parallel to the axial center line of the limiting plate 2 .

[0056] It should also be noted that the mounting hole 301 can be fixed to the welding machine base by providing bolts therein. The mounting hole 301 is located on the transition slope 103, which can increase the length of the mounting hole 301 and improve the strength.

[0057] Exemplarily, the positioning seat 1 and the limiting plate 2 are integrally formed.

[0058] Exemplarily, the positioning seat 1 and the limiting plate 2 are made of copper.

[0059] It should also be noted that the advantage of using copper for the positioning seat 1 and the limiting plate 2 is that during the welding process, the copper fixture can quickly disperse heat, reducing thermal stress concentration in the welding area, helping to prevent welding deformation and cracks. During long-term use or high-frequency welding operations, the copper fixture can better resist wear and tear, extending its service life. It also resists chemical corrosion in the welding environment to a certain extent, maintaining the integrity and stability of the fixture.

[0060] At the same time, it has good machinability and can be easily processed into fixtures of various shapes and sizes through casting, forging, stamping and other processes. The processing difficulty is lower when it is one-piece formed, and the heat generated by welding is quickly dissipated, which reduces the temperature of the welding area, helps to control welding deformation and reduce welding stress.

[0061] In summary, a positioning fixture for an all-position tube sheet automatic welding machine of the present invention is used to place the assembled heat exchange tube to be welded and the heat exchange tube sleeve of the flange tube sheet assembly on the positioning seat 1, with its end against the positioning portion 101, to complete fast and precise positioning. This process greatly improves the welding accuracy, efficiency and quality. At the same time, it is applicable to three pipe laying methods: pipe extension, pipe flushing or pipe inward shrinkage, and the positioning fixture can be quickly replaced through the installation portion 3, which improves the flexibility of welding. It has a simple structure, is easy to operate, and has wide applicability and promotion value.

[0062] The above embodiments are merely illustrative of the principles and effects of the present invention and are not intended to limit the present invention. Anyone skilled in the art may modify or alter the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or alterations made by one of ordinary skill in the art without departing from the spirit and technical principles disclosed in the present invention are intended to be covered by the claims of the present invention.

Claims

1. A positioning fixture for an all-position tube sheet automatic welding machine, used for positioning the heat exchange tube to be welded and the flange tube sheet assembly during welding, characterized by: include: A positioning seat, which is cylindrical and used to support and position the heat exchange tube to be welded and the flange tube sheet assembly; A limiting plate, the limiting plate is connected to the positioning seat, the limiting plate is an arc-shaped structure, the axis of the limiting plate coincides with the axis of the positioning seat, the outer diameter of the limiting plate decreases along the length direction of its axis, and the small-diameter end of the limiting plate is connected to the positioning seat; A positioning portion is formed at the connection between the limiting plate and the positioning seat, and the end of the heat exchange tube to be welded abuts against the positioning portion. A limiting portion is also provided on the outer arc surface of the limiting plate, and the limiting portion is used to limit the outer shape of the positioning fixture; The end surface of the limiting plate away from the positioning seat is further provided with a mounting portion, and the mounting portion is used to be connected to the welding machine base.

2. The positioning fixture for an all-position tube-to-sheet automatic welding machine according to claim 1, characterized in that: The central angle of the limiting plate is less than 90°.

3. The positioning fixture for an all-position tube-to-sheet automatic welding machine according to claim 1, characterized in that: The end surface of the positioning seat close to the limiting plate is also provided with a heat dissipation inclined surface.

4. The positioning fixture for an all-position tube-to-sheet automatic welding machine according to claim 1, characterized in that: The inner arc surface of the limiting plate is provided with a first heat dissipation step, a second heat dissipation step and a third heat dissipation inclined surface in sequence along the length direction of its axis. The first heat dissipation step is close to the positioning seat, and the third heat dissipation inclined surface is close to the mounting portion.

5. The positioning fixture for an all-position tube-to-sheet automatic welding machine according to claim 4, characterized in that: The limiting portion and the mounting portion are inclined to transition to form a transition slope, and the transition slope is arranged to face back to back with the third heat dissipation slope.

6. The positioning fixture for an all-position tube-to-sheet automatic welding machine according to claim 1, characterized in that: The end of the positioning seat away from the limiting plate is further provided with a chamfer.

7. The positioning fixture for an all-position tube-to-sheet automatic welding machine according to claim 5, characterized in that: The end surface of the limiting plate away from the positioning seat is provided with a plurality of mounting holes, the mounting holes are evenly distributed along the end surface of the large opening of the limiting plate, and all the mounting holes form the mounting portion.

8. The positioning fixture for an all-position tube-to-sheet automatic welding machine according to claim 7, characterized in that: One end of the mounting hole is connected to the end surface of the large opening of the limiting plate, the other end of the mounting hole is located on the transition slope, and the hole center line of the mounting hole is parallel to the axis center line of the limiting plate.

9. The positioning fixture for an all-position tube-to-sheet automatic welding machine according to claim 8, characterized in that: The positioning seat and the limiting plate are integrally formed.

10. The positioning fixture for an all-position tube-to-sheet automatic welding machine according to claim 9, characterized in that: The positioning seat and the limiting plate are made of copper.

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