Back follow-up argon protection device for spin welding of large annular structural member

Abstract

The invention discloses a back follow-up type argon protection device for rotary welding of a large annular structural part. The back follow-up type argon protection device comprises an annular weld joint argon protection structure, a flow dividing assembly and a plurality of gas pipes. The argon protection structure for the circumferential weld comprises an annular cover plate and a cylinder, a plurality of air holes penetrating through the upper and lower sides of the annular cover plate are uniformly distributed on the circumference of the upper end surface of the annular cover plate; the outer diameter is smaller than the inner diameter of a barrel of the large annular structural member to form radial clearance fit; the cylinder is formed by extending downwards along the inner side edge of the annular cover plate, and the height of the cylinder is larger than the axial height of an annular welding seam at the joint of the lower edge of the cylinder body and a base of the large annular structural part. The top of the gas distribution box is rotationally connected with a gas inlet pipe through a bearing structure, and a plurality of exhaust pipes are arranged at the bottom of the gas distribution box; two ends of the air pipe are respectively connected with the exhaust pipe and the air hole; the annular cover plate, the cylinder, the inner wall of the cylinder body and the inner wall of the base jointly define a closed argon chamber. The rotary welding device is suitable for rotary welding of annular structural parts and has the advantages of being good in argon protection effect and high in welding seam forming quality.

Description

Technical Field

[0001] The present invention belongs to the technical field of welding, and specifically relates to a back-following argon protection device for rotary welding of large ring-shaped structural parts. Background Art

[0002] In recent years, with the advancement of digital transformation in the manufacturing industry, automated and digital welding technologies have gradually been applied and promoted. For the rotary automatic welding of large ring-shaped structural parts, its general form is that the workpiece rotates and the welding torch remains stationary for unrestricted rotary welding; during the automatic welding process, the cavity at the back of the weld of the large ring-shaped structural part is too large, and the overall filling of argon has a poor protection effect. At the same time, when welding with overall argon filling, the cavity is generally connected by an air pipe, and the air pipe will rotate together with the large ring-shaped structural part; when there are many air pipes, there is also a problem that the air pipes will be entangled with each other. In addition, in the cavity of a confined space, due to the narrow space, it is difficult for manual operation to set up a local back-argon device that is convenient for installation and removal, resulting in poor forming quality of the back of the weld. Summary of the Invention

[0003] The purpose of the present invention is to provide a back-following argon protection device for rotary welding of large ring-shaped structural parts that is suitable for rotary welding of ring-shaped structural parts, has good argon protection effect and high weld forming quality, aiming at the deficiencies of the prior art.

[0004] The technical object of the present invention is achieved by the following technical solutions: A back-following argon protection device for rotary welding of large ring-shaped structural parts includes an argon protection structure for the annular weld, a flow splitting component, and multiple air pipes; the argon protection structure for the annular weld includes an annular cover plate and a cylinder; a plurality of air holes penetrating through the upper and lower sides of the annular cover plate are evenly distributed in a circumferential direction on the upper end surface of the annular cover plate, and its outer diameter is smaller than the inner diameter of the cylinder body of the large ring-shaped structural part to form a radial clearance fit; the cylinder extends downward along the inner edge of the annular cover plate, and its height is greater than the axial height of the annular weld at the joint of the lower edge of the cylinder body and the base of the large ring-shaped structural part, so that the annular cover plate covers directly above the annular weld; the flow splitting component includes a gas distribution box, the top of the gas distribution box is rotationally connected to an inlet pipe through a bearing structure, and a plurality of exhaust pipes are provided at its bottom; both ends of the air pipe are respectively connected to the exhaust pipe and the air hole; among them, the annular cover plate, the cylinder, the inner wall of the cylinder body, and the inner wall of the base jointly enclose a closed argon chamber.

[0005] Preferably, a bearing installation groove is provided at the air inlet of the gas distribution box, and the outer ring of the bearing is fixed in the bearing installation groove; one end of the inlet pipe is fixedly connected to the inner ring of the bearing, and the other end is connected to a gas source.

[0006] Preferably, the lower end of the exhaust pipe is connected to a flow splitting device.

[0007] Preferably, the flow splitting device is a tee pipe.

[0008] Preferably, a plurality of first positioning plates extend upward on the outer side of the annular cover plate.

[0009] Preferably, a plurality of second positioning plates extend toward the axis on the inner side of the bottom end of the cylinder.

[0010] Preferably, the argon protection structure for the circumferential weld is formed by splicing a plurality of arc-shaped structures.

[0011] Preferably, at the joints between the arc-shaped structures, between the arc-shaped structures and the inner wall of the cylinder, and between the arc-shaped structures and the base, the surfaces are adhesively sealed with high-temperature adhesive tape.

[0012] Compared with the prior art, the beneficial effects of the present invention are as follows: 1. Through the structures of the annular cover plate and the cylinder, the present invention can effectively guide argon gas to the circumferential weld area to form a uniform argon gas protection layer. The design of the radial clearance fit between the annular cover plate and the cylinder body and the height of the cylinder being greater than the axial height of the circumferential weld at the joint between the lower edge of the cylinder body and the base of the large annular structural member ensures the uniform distribution and effective coverage of argon gas. The use of the bearing structure on the gas distribution box allows the device to rotate follow-up during the welding process, maintaining the continuity and stability of argon gas protection. The present invention is applicable to the rotary welding of large annular structural members, can avoid the winding of the gas pipe during the rotary welding process; effectively improve the argon gas protection effect and effectively improve the weld forming quality.

[0013] 2. At the air inlet of the gas distribution box of the present invention, a bearing installation groove is provided, and the outer ring of the bearing is fixed in the bearing installation groove; one end of the air inlet pipe is fixedly connected to the inner ring of the bearing, and the other end is connected to the gas source. With this technology, the leakage of gas from the bearing is isolated, and at the same time, it can ensure that the flow distribution component does not have the phenomenon of gas pipe winding during the rotary welding of the annular structural member, so that the air inlet pipe remains stable during the rotation of the device, ensuring the stability of argon gas supply.

[0014] 3. The argon protection structure for the circumferential weld of the present invention is formed by splicing a plurality of arc-shaped structures. With this technical measure, it has the advantages of simple structure, convenient installation and disassembly in a limited space, etc. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 is a schematic structural diagram of the present invention; Figure 2 is Figure 1 a schematic structural diagram of the argon protection structure for the circumferential weld in Figure 3 is Figure 1 a schematic structural diagram of the gas distribution box in Figure 4 is a diagram of the usage state of the present invention; Figure 5It is a schematic diagram of the cooperation between the argon protection structure for circumferential welds and a large circumferential structural member; Figure 6 It is Figure 5 a sectional view of; Figure 7 It is a schematic diagram of the structure where high-temperature adhesive tapes are pasted between the argon protection structure for circumferential welds and a large circumferential structural member; Reference numerals: 1 - argon protection structure for circumferential welds; 11 - circumferential cover plate; 111 - air holes; 112 - first positioning plate; 12 - cylinder; 121 - second positioning plate; 2 - flow splitting assembly; 21 - air distribution box; 211 - air inlet; 212 - bearing installation groove; 22 - air inlet pipe; 23 - exhaust pipe; 24 - bearing; 25 - three-way pipe; 3 - air pipe; 41 - first high-temperature adhesive tape; 42 - second high-temperature adhesive tape; 43 - third high-temperature adhesive tape; 100 - large circumferential structural member; 101 - cylinder body; 102 - base; 200 - circumferential weld. Detailed implementation manners

[0016] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are some, but not all, of the embodiments of the present invention. Usually, the components of the embodiments of the present invention described and illustrated herein can be arranged and designed in various different configurations.

[0017] Therefore, the following detailed description of the embodiments of the present invention provided in the drawings is not intended to limit the scope of the claimed present invention, but merely represents selected embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts fall within the scope of protection of the present invention.

[0018] It should be noted that: Similar reference numerals and letters denote similar items in the following drawings. Therefore, once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings. In addition, the terms "first", "second", etc. are only used for distinguishing descriptions and cannot be understood as indicating or implying relative importance.

[0019] Such as Figure 1 — Figure 7As shown in the figure, a back-following argon protection device for rotary welding of large ring-shaped structural parts includes an argon protection structure 1 for circular welds, a flow splitting assembly 2, and multiple gas pipes 3. The argon protection structure 1 for circular welds includes a circular cover plate 11 and a cylinder 12. A plurality of air holes 111 penetrating through the upper and lower sides are evenly distributed in the circumferential direction on the upper end surface of the circular cover plate 11, and its outer diameter is smaller than the inner diameter of the cylinder body 101 of the large ring-shaped structural part 100 to form a radial clearance fit. The cylinder 12 extends downward along the inner edge of the circular cover plate 11, and its height is greater than the axial height of the circular weld 200 at the joint of the lower edge of the cylinder body 101 and the base 102 of the large ring-shaped structural part 100, so that the circular cover plate 11 covers directly above the circular weld 200. The flow splitting assembly 2 includes a gas distribution box 21. The top of the gas distribution box 21 is rotationally connected to the inlet pipe 22 through a bearing structure, and multiple exhaust pipes 23 are provided at its bottom. The two ends of the gas pipe 3 are respectively connected to the exhaust pipe 23 and the air hole 111. Among them, the circular cover plate 11, the cylinder 12, the inner wall of the cylinder body 101, and the inner wall of the base 102 jointly enclose a closed argon chamber. Through the structures of the circular cover plate 11 and the cylinder 12, argon can be effectively guided to the area of the circular weld 200 to form a uniform argon protection layer. The design of the radial clearance fit between the circular cover plate 11 and the cylinder body 101 and the height of the cylinder 12 being greater than the axial height of the circular weld 200 at the joint of the lower edge of the cylinder body 101 and the base 102 of the large ring-shaped structural part 100 ensures the uniform distribution and effective coverage of argon. The use of the bearing structure on the gas distribution box 21 allows the device to follow and rotate during the welding process, maintaining the continuity and stability of argon protection. Therefore, by adopting this technical measure, it is applicable to the rotary welding of large ring-shaped structural parts 100, can avoid the entanglement of the gas pipe 3 during the rotary welding process, effectively improve the argon protection effect, and effectively improve the weld forming quality.

[0020] As Figures 4 - 6 shown, in this embodiment, the large ring-shaped structural part 100 is a cylinder structure with one end open, which includes a cylinder body 101 and a base 102 that closes the open end of the cylinder body 101. The cross-section of the base 102 is U-shaped. The radial clearance between the outer diameter of the circular cover plate 11 and the inner diameter of the cylinder body 101 is 0.5 - 2 mm. The height of the cylinder 12 is 20 - 30 mm greater than the axial height of the circular weld 200. When the argon protection structure 1 for circular welds is placed inside the cylinder body 101 of the large ring-shaped structural part 100, the bottom end of the cylinder 12 abuts against the upper end of the base 102. The argon protection structure 1 for circular welds can accurately and fixedly position the protective gas on the back of the weld, and the protection effect is good.

[0021] As Figure 1 and Figure 3As shown in the figure, a bearing installation groove 212 is provided at the air inlet 211 of the air distribution box 21, and the outer ring of the bearing 24 is fixed in the bearing installation groove 212; one end of the intake pipe 22 is fixedly connected to the inner ring of the bearing 24, and the other end is connected to the air source. In specific implementation, the air distribution box 21 adopts a square box body. The inside of the air distribution box 21 is a containing cavity for containing argon. An air inlet 211 communicating with the containing cavity is provided at the center of the upper end of the air distribution box 21, and a plurality of exhaust pipes 23 communicating with the containing cavity are provided at the bottom of the air distribution box 21. The intake end and the outlet end of the air pipe 3 are respectively connected to the exhaust pipe 23 and the air hole 111. A bearing installation groove 212 with a diameter larger than the air inlet 211 is provided at the air inlet 211 of the air distribution box 21; the outer diameter of the outer ring of the bearing 24 is equivalent to the outer diameter of the bearing installation groove 212, and the outer ring of the bearing 24 is fixed in the bearing installation groove 212. The diameter of the inner ring of the bearing 24 is less than or equal to the diameter of the air inlet 211. In this embodiment, the diameter of the inner ring of the bearing 24 is equal to the diameter of the air inlet 211. The outer diameter of the intake pipe 22 is matched with the diameter of the inner ring of the bearing 24. One end of the intake pipe 22 is fixedly connected to the inner ring of the bearing 24. Through the cooperation of the bearing installation groove 212 and the bearing 24, the connection stability and reliability of the intake pipe 22 are improved. With this technology, gas leakage from the bearing 24 is isolated, and at the same time, it can be ensured that the shunt assembly 2 does not get the air pipe 3 entangled during the rotation welding with the annular structural member during operation. Thus, the intake pipe 22 remains stable during the rotation of the device, ensuring the stability of the argon supply.

[0022] As Figure 1 shown, the lower end of the exhaust pipe 23 is connected to a shunt device. In this embodiment, eight air holes 111 penetrating through the upper and lower sides thereof are evenly distributed in the circumferential direction on the upper end surface of the annular cover plate 11. Correspondingly, there are eight air pipes 3. In this embodiment, there are four exhaust pipes 23. The argon gas is evenly distributed through the shunt device to ensure that the argon gas can be evenly distributed to each air hole 111, thereby improving the effect of argon protection. This structure can reduce the waste of argon gas and improve the utilization efficiency of argon gas.

[0023] As Figure 1 shown, in specific implementation, the shunt device is a tee pipe 25. One end of the tee pipe 25 is connected to the lower end of the exhaust pipe 23, and the other two ends are respectively connected to one end of the air pipe 3 away from the air hole 111. By providing the tee pipe 25, the exhaust pipe 23 can divide the argon gas into multiple paths for transportation, further improving the uniformity of argon gas distribution. With this technical measure, the distribution of argon gas can be flexibly adjusted according to needs in actual application to meet different welding requirements. As Figure 1 , Figure 2 , Figure 5 , Figure 6 , Figure 7As shown, multiple first positioning plates 112 extend upward from the outer side of the annular cover plate 11. In specific implementation, 2 to 6 first positioning plates 112 extend upward from the outer side of the annular cover plate 11, and the first positioning plates 112 are evenly distributed circumferentially on the annular cover plate 11. By providing the first positioning plates 112, the structural strength of the annular cover plate 11 is enhanced, and a positioning function is provided during the installation process to ensure the accurate installation and stable fixation of the annular cover plate 11.

[0024] As Figure 1 , Figure 2 , Figure 5 , Figure 6 , Figure 7 As shown, multiple second positioning plates 121 extend toward the axis from the inner side of the bottom end of the cylinder 12. In specific implementation, 2 to 6 second positioning plates 121 extend toward the axis from the inner side of the bottom end of the outer side of the cylinder 12, and the second positioning plates 121 are evenly distributed circumferentially on the inner wall of the cylinder 12. By providing the second positioning plates 121, the structural strength of the cylinder 12 is enhanced, and a positioning and supporting function is provided during the installation process to ensure the stability and accuracy of the cylinder 12.

[0025] As Figure 1 , Figure 2 , Figure 5 , Figure 6 , Figure 7 As shown, the annular weld argon protection structure 1 is formed by splicing multiple arc-shaped structures. In this embodiment, the annular weld argon protection structure 1 is composed of four 90-degree arc-shaped structures. Each arc-shaped structure is provided with two air holes 111, one first positioning plate 112, and one second positioning plate 121. The annular weld argon protection structure 1 is formed by splicing multiple arc-shaped structures, which can improve the flexibility and adaptability of the device, and facilitate installation and disassembly in a limited space. At the same time, it also helps to reduce transportation and storage costs. Therefore, adopting this technical measure has the advantages of simple structure and being easy to install and disassemble in a limited space. As Figure 7 As shown, at the joints between the arc-shaped structures, between the arc-shaped structures and the inner wall of the cylinder body 101, and between the arc-shaped structures and the base 102, the surfaces are adhesively sealed with high-temperature adhesive tape. In this embodiment, the joint between the arc-shaped structures is adhesively sealed with the first high-temperature adhesive tape 41 on the surface; the joint between the arc-shaped structures and the inner wall of the cylinder body 101 is adhesively sealed with the second high-temperature adhesive tape 42 on the surface; the joint between the arc-shaped structures and the base 102 is adhesively sealed with the third high-temperature adhesive tape 43 on the surface. By providing the first high-temperature adhesive tape 41, the second high-temperature adhesive tape 42, and the third high-temperature adhesive tape 43, the sealing performance at the joints between the arc-shaped structures, between the arc-shaped structures and the inner wall of the cylinder body 101, and between the arc-shaped structures and the base 102 is ensured, preventing argon leakage, and improving the reliability and efficiency of the device. This sealing method is simple and effective, and is easy to operate and maintain.

[0026] The above has introduced in detail the technical solutions provided by the embodiments of the present invention. Specific examples are used herein to expound the principles and implementation manners of the embodiments of the present invention. The description of the above embodiments is only applicable to helping understand the principles of the embodiments of the present invention. At the same time, for those of ordinary skill in the art, according to the embodiments of the present invention, there will be changes in the specific implementation manners and application scopes. In summary, the content of this specification should not be construed as a limitation on the present invention.

Claims

1. A back-following argon protection device for rotary welding of large ring-shaped structural parts, characterized in that, It includes an argon protection structure for the circumferential weld, a flow splitting component, and multiple gas pipes; The argon protection structure for the circumferential weld includes a circular cover plate and a cylinder; The upper end surface of the circular cover plate is evenly distributed with a plurality of air holes penetrating through its upper and lower sides in the circumferential direction, and its outer diameter is smaller than the inner diameter of the cylinder body of the large circular structural member to form a radial clearance fit; The cylinder extends downward along the inner edge of the circular cover plate, and its height is greater than the axial height of the circumferential weld at the joint between the lower edge of the cylinder body and the base of the large circular structural member, so that the circular cover plate covers directly above the circumferential weld; The flow splitting component includes a gas distribution box. The top of the gas distribution box is rotatably connected to the inlet pipe through a bearing structure, and multiple exhaust pipes are arranged at its bottom; both ends of the gas pipe are respectively connected to the exhaust pipe and the air hole; Among them, the circular cover plate, the cylinder, the inner wall of the cylinder body, and the inner wall of the base jointly enclose a closed argon chamber.

2. The back-following argon protection device for rotary welding of large ring structural parts according to claim 1, characterized in that, A bearing installation groove is provided at the air inlet of the gas distribution box, and the outer ring of the bearing is fixed in the bearing installation groove; one end of the inlet pipe is fixedly connected to the inner ring of the bearing, and the other end is connected to the gas source.

3. The back-following argon protection device for rotary welding of large ring-shaped structural parts according to claim 1, characterized in that, The lower end of the exhaust pipe is connected to a flow splitting device.

4. The back-following argon gas protection device for rotary welding of large ring-shaped structural parts according to claim 3, characterized in that, The flow splitting device is a tee pipe.

5. The back-following argon protection device for rotary welding of large ring-shaped structural parts according to claim 1, characterized in that, Multiple first positioning plates extend upward from the outside of the circular cover plate.

6. The backside follow-up type argon protection device for rotary welding of large ring-shaped structural parts according to claim 1, characterized in that, Multiple second positioning plates extend toward the axis from the inner side of the bottom end of the cylinder.

7. The back-following argon protection device for rotary welding of large ring-shaped structural parts according to claim 1, characterized in that, The argon protection structure for the circumferential weld is formed by splicing multiple arc-shaped structures.

8. The back-following argon protection device for rotary welding of large ring-shaped structural parts according to claim 7, characterized in that, At the joints between the arc-shaped structures, between the arc-shaped structures and the inner wall of the cylinder body, and between the arc-shaped structures and the base, the surfaces are adhesively sealed with high-temperature adhesive tape.

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