Machining method of metal corrugated pipe

Abstract

The invention relates to the technical field of copper corrugated pipe machining, and provides a metal corrugated pipe machining method which comprises the following steps: S1, sleeving a plurality of pipe fittings together; s2, the multi-wall pipe is expanded through an expanding device, a protruding part is machined on the side wall of the multi-wall pipe, and the protruding part comprises a radial protrusion and a plurality of axial protrusions; and S3, the multi-wall pipe is moved, the step S2 is repeated, the multiple protruding parts are machined on the multi-wall pipe, and the moving direction of the multi-wall pipe is the direction from the end, provided with the axial protrusion, of the radial protrusion to the end, not provided with the axial protrusion, of the radial protrusion. The axial protrusion is arranged at one end of the radial protrusion, when the multi-wall pipe is expanded, the multi-wall pipe is limited through the axial protrusion, and sliding of the side wall formed on the multi-wall pipe can be avoided; therefore, the abutting compactness of the multiple layers of side walls of the metal corrugated pipe machined through the method and the overall performance of the metal corrugated pipe machined through the method are guaranteed.

Description

Technical Field

[0001] The present invention relates to the technical field of copper bellows processing, and particularly to a processing method for metal bellows. Background Art

[0002] Copper bellows are a common type of metal bellows. Due to their advantages such as strong thermal conductivity, good corrosion resistance, and high stability, they have good performance in heat dissipation and are thus widely used in occasions that require efficient heat dissipation.

[0003] In order to enhance the strength and durability of copper bellows, multi-wall bellows have emerged. The bellows are set in multiple layers, which can not only disperse and absorb external extrusion but also provide multiple sealing barriers for the pipeline, enabling the bellows to effectively resist external damage.

[0004] For example, a processing device and process for corrugated tubes disclosed in the invention patent with the publication number CN118082265A are provided with an expanding arc plate and an expanding block. By using the reciprocating movement of the expanding arc plate and the expanding block, extrusion of the inner wall of the metal bellows is achieved. However, as Figure 14 shown, the multi-wall bellows processed by this processing device will have the problem of side wall delamination, which affects the overall performance of the copper bellows. Summary of the Invention

[0005] In view of this, the present invention proposes a processing method for metal bellows, which can avoid the delamination problem during the processing of multi-wall tubes and ensure the overall performance of the metal bellows.

[0006] The technical solution of the present invention is realized as follows: The present invention provides a processing method for metal bellows, including the following steps: S1, sleeving a plurality of pipe fittings together to form a multi-wall tube; S2, using an expanding device to expand the multi-wall tube, and processing a raised portion on the side wall of the multi-wall tube. The raised portion includes a radial protrusion and a plurality of axial protrusions. Among them, the radial protrusion is a circular ring-shaped protrusion structure; the axial protrusion is located at one end of the radial protrusion along the axial direction of the multi-wall tube, and the axial protrusion is integrally formed and continuously arranged with the radial protrusion and the multi-wall tube; S3, moving the multi-wall tube and repeating step S2 to process a plurality of the raised portions on the multi-wall tube, where the moving direction of the multi-wall tube is from the end of the radial protrusion where the axial protrusion is provided to the end where the axial protrusion is not provided.

[0007] Based on the above technical solutions, preferably, the expansion support device includes a support tube, a plurality of support rods, a plurality of sliders, a driving rod, and a plurality of connecting rods. Among them, the support rods are fixedly arranged on the support tube; the sliders are slidably arranged on the support rods; the driving rod is slidably arranged in the support tube; both ends of the connecting rod are rotatably arranged on the slider and the driving rod respectively, and the connecting rod penetrates and is slidably arranged on the support tube, and the plurality of connecting rods, the plurality of support rods, and the plurality of sliders correspond to each other one by one.

[0008] More preferably, the slider includes a first support block, a second support block, a resisting rod, a spring, and a limiting rod. Among them, the first support block is slidably arranged on the support rod, and one end of the connecting rod is rotatably arranged on the first support block; one end of the second support block is rotatably arranged in the first support block; the resisting rod is slidably arranged in the first support block and abuts against the second support block; the spring is arranged on the first support block, and one end of the spring abuts against the end of the resisting rod away from the second support block; the limiting rod is slidably arranged in the first support block. When the support rod is slidably arranged in the first support block, the support rod abuts or does not abut against the limiting rod. Among them, when the support rod abuts against the limiting rod, the limiting rod is clamped with the resisting rod; when the support rod does not abut against the limiting rod, the limiting rod is slidably connected with the resisting rod.

[0009] More preferably, the side of the first support block connected to the connecting rod is perpendicular to the axis of the multi-wall tube; when the limiting rod is clamped with the resisting rod, the end of the second support block away from the first support block is flush with the side of the first support block connected to the connecting rod; when the limiting rod is slidably connected with the resisting rod, the end of the second support block away from the first support block is located on the side of the first support block close to the connecting rod.

[0010] More preferably, the side of the first support block away from the connecting rod is inclined to the axis of the multi-wall tube.

[0011] More preferably, both ends of the limiting rod are in a bevel shape.

[0012] Based on the above technical solutions, preferably, the cross-section of the radial protrusion is semi-circular; the axial protrusion abuts against the radial protrusion adjacent to it and not located in the same protrusion part.

[0013] Based on the above technical solutions, preferably, in step S1, the multi-wall tube includes an inner tube and an outer tube. After the outer tube is sleeved on the inner tube, the parts of the two ends of the inner tube extending out of the outer tube are first flared, and then a flanging top block and a stamping device are used to flange the flared part of the inner tube to form a winding part. The cross-section of the winding part is spiral, and the winding part is abutted against the side wall of the outer tube; a bulging groove is formed at one end of the flanging top block away from the stamping device, and the bulging groove is a frustum-shaped structure, and the inner diameter of the end close to the stamping device is smaller than the inner diameter of the end away from the stamping device; a flanging groove is formed in the bulging groove, and the cross-section of the flanging groove is semi-circular, and the inner wall of the flanging groove is continuously arranged with the inner wall of the bulging groove.

[0014] More preferably, after the metal bellows is processed, the two ends of the multi-wall tube are cut, and the cutting surfaces respectively coincide with the middle positions of the two winding parts.

[0015] More preferably, the end faces of the cut inner tube and the outer tube are both conical, the end face of the inner tube is flush with the end face of the outer tube, and the length of the outer tube is not greater than the length of the inner tube.

[0016] The processing method of a metal bellows of the present invention has the following beneficial effects compared with the prior art:

[0017] By arranging an axial protrusion at one end of the radially protruding part, when expanding and supporting the multi-wall tube, the axial protrusion is used to limit the multi-wall tube, so as to avoid the sliding of the formed side wall on the multi-wall tube, thereby ensuring the abutting tightness of the multi-layer side walls of the metal bellows processed by this method and the overall performance of the metal bellows processed by this method; by arranging a first support block, a second support block, a supporting rod, a spring and a limiting rod in the slider, the mutual cooperation of the limiting rod with the supporting rod and the supporting rod can be used to realize the one-time processing of the radially protruding part and the axial protruding part, thereby improving the processing efficiency of this method; by flaring and flanging the end of the inner tube, the abutting tightness between the end of the inner tube and the end of the outer tube can be improved. At the same time, by using the winding part to clamp the multi-wall tube, the cutting neatness of the multi-wall tube interface can also be improved. Description of the Drawings

[0018] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required to be used in the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0019] Figure 1Stereogram of the multi-wall pipe processed by a processing method of a metal bellows according to the present invention.

[0020] Figure 2 Cross-sectional view of the raised portion of the multi-wall pipe processed by a processing method of a metal bellows according to the present invention.

[0021] Figure 3 Stereogram of the expanding device in a processing method of a metal bellows according to the present invention.

[0022] Figure 4 Stereogram of the slider in a processing method of a metal bellows according to the present invention.

[0023] Figure 5 Partial cross-sectional view of the expanding device in a processing method of a metal bellows according to the present invention.

[0024] Figure 6 Cross-sectional view of the slider when the slider does not expand the multi-wall pipe in a processing method of a metal bellows according to the present invention.

[0025] Figure 7 Cross-sectional view of the slider when the slider expands the multi-wall pipe in a processing method of a metal bellows according to the present invention.

[0026] Figure 8 Cross-sectional view of the limit rod in a processing method of a metal bellows according to the present invention.

[0027] Figure 9 Side view of multiple sliders when expanding the multi-wall pipe in a processing method of a metal bellows according to the present invention.

[0028] Figure 10 Schematic diagram of the processing method of the end of the multi-wall pipe in a processing method of a metal bellows according to the present invention.

[0029] Figure 11 Cross-sectional view of the winding portion in a processing method of a metal bellows according to the present invention.

[0030] Figure 12 Cross-sectional view of the flanging top block in a processing method of a metal bellows according to the present invention.

[0031] Figure 13 Cross-sectional view of the flanging groove in a processing method of a metal bellows according to the present invention.

[0032] Figure 14 Cross-sectional view of the metal bellows processed in the prior art.

[0033] Wherein: 1. Multi-wall tube; 11. Inner tube; 12. Outer tube; 101. Protrusion; 1011. Radial protrusion; 1012. Axial protrusion; 102. Winding part; 2. Expanding device; 21. Support tube; 22. Support rod; 23. Slide block; 231. First support block; 232. Second support block; 233. Abutted rod; 234. Spring; 235. Limiting rod; 24. Driving rod; 25. Connecting rod; 3. Flanging top block; 301. Expansion groove; 302. Flanging groove. Specific embodiments

[0034] The following will clearly and completely describe the technical solutions in the present invention in conjunction with the specific embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments in the present invention, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the protection scope of the present invention.

[0035] As a member of metal bellows, the multi-wall copper bellows has good thermal conductivity, corrosion resistance and stability. With this advantage, the multi-wall copper bellows performs extremely well in heat dissipation. For this reason, it is widely used in various occasions with extremely high requirements for heat dissipation efficiency and has become an indispensable key component in high-efficiency heat dissipation solutions.

[0036] The side wall of the multi-wall copper bellows is composed of a multi-layer structure. When expanding and supporting the corrugations, the expanding force will apply a tensile force to the formed corrugation structure, causing the formed corrugation structure to deform, resulting in the problem of delamination of the bellows side wall and affecting the overall performance of the multi-wall copper bellows.

[0037] A processing method of a metal bellows according to the present invention uses an expanding device 2 and a flanging top block 3 to expand and support a multi-wall tube 1, so as to avoid the problem of side wall delamination of the multi-wall tube 1 during the processing and ensure the overall performance of the multi-wall tube 1. The operation steps are as follows.

[0038] S1. Select pipe fittings with specified quantities and specifications according to the design requirements, and sequentially sleeve multiple pipe fittings to ensure that the inner and outer walls of adjacent pipe fittings are closely fitted to form a multi-wall tube 1 with a stable structure. During this process, the concentricity and surface roughness between the pipe fittings need to be strictly controlled to reduce potential errors in subsequent processing.

[0039] S2. Insert the expanding device 2 into the multi-wall tube 1, and use the expanding device 2 to expand the inner wall of the multi-wall tube 1 to process a protrusion 101 on the side wall of the multi-wall tube 1. To ensure the processing quality, the operator needs to monitor key parameters such as expanding pressure, speed and temperature in real time.

[0040] S3. Move the multi-wall tube 1 and repeat step S2 to continuously process a plurality of uniformly distributed protrusions 101 on the multi-wall tube 1, so as to realize the processing of the metal bellows.

[0041] When expanding and supporting the latter protrusion 101, pressure will be exerted on the side wall of the multi-wall tube 1, causing the previously expanded and formed protrusion 101 to move axially, resulting in delamination of the side wall of the multi-wall tube 1. Therefore, the structure of the protrusion 101 has been improved. For example, Figure 1 and Figure 2 As shown, the protrusion 101 includes a radial protrusion 1011 and a plurality of axial protrusions 1012. The radial protrusion 1011 is a circular ring-shaped protrusion structure, that is, the corrugation of the metal bellows. The axial protrusion 1012 is located at one end of the radial protrusion 1011 along the axial direction of the multi-wall tube 1. The axial protrusion 1012 is integrally formed with the radial protrusion 1011 and the multi-wall tube 1 and is continuously arranged. When expanding and forming a protrusion 101, move the multi-wall tube 1 in the direction from the end where the axial protrusion 1012 is provided on the radial protrusion 1011 to the end where the axial protrusion 1012 is not provided. Thus, when expanding and supporting the next protrusion 101, the fixation of the side wall of the multi-wall tube 1 by the axial protrusion 1012 makes the side wall of the multi-wall tube 1 not easily delaminate, thereby ensuring the overall performance of the multi-wall tube 1.

[0042] For example, Figure 4 and Figure 5 As shown, the expanding and supporting device 2 includes a support tube 21, a plurality of support rods 22, a plurality of sliders 23, a driving rod 24 and a plurality of connecting rods 25. The support rods 22 are fixedly arranged on the support tube 21. The sliders 23 are slidably arranged on the support rods 22. The driving rod 24 is slidably arranged in the support tube 21. Both ends of the connecting rod 25 are rotatably arranged on the slider 23 and the driving rod 24 respectively, and the connecting rod 25 penetrates and is slidably arranged on the support tube 21. The plurality of connecting rods 25, the plurality of support rods 22 and the plurality of sliders 23 are all arranged in a circumferential array around the axis of the support tube 21, and the plurality of connecting rods 25, the plurality of support rods 22 and the plurality of sliders 23 correspond one by one. As Figure 5 shown, when using a telescopic device such as a telescopic cylinder to drive the driving rod 24 to move to the right, the plurality of sliders 23 can be made to abut against the support tube 21 to sleave the multi-wall tube 1 outside the plurality of sliders 23; when using a telescopic device such as a telescopic cylinder to drive the driving rod 24 to move to the left, the sliders 23 can be driven to move away from the support tube 21. As Figure 9 shown, the plurality of sliders 23 are dispersed, so as to realize the expansion and support of the inner wall of the multi-wall tube 1 and process the required protrusions 101.

[0043] In order to enable the slider 23 to perform a one-time expansion and forming on the radial protrusion 1011 and the axial protrusion 1012, the slider 23 is set to include a first support block 231, a second support block 232, a holding rod 233, a spring 234, and a limiting rod 235. The first support block 231 is slidably arranged on the support rod 22. One end of the connecting rod 25 is rotatably arranged on the first support block 231. One end of the second support block 232 is rotatably arranged inside the first support block 231. The other end of the second support block 232 extends out of the first support block 231. The holding rod 233 is slidably arranged inside the first support block 231 and abuts against the second support block 232. The spring 234 is arranged on the first support block 231. One end of the spring 234 abuts against the end of the holding rod 233 away from the second support block 232. The limiting rod 235 is slidably arranged inside the first support block 231; as Figure 6 shown, when the support rod 22 is slidably arranged inside the first support block 231 and abuts against the limiting rod 235, the limiting rod 235 is clamped with the holding rod 233, so that the holding rod 233 abuts against and fixes the second support block 232, preventing the second support block 232 from rotating. At this time, by using the driving rod 24 and the connecting rod 25 to push the slider 23 to move, the circumferential sides of the multi-wall tube 1 can be simultaneously expanded by the first support block 231 and the second support block 232; when the slider 23 moves a certain distance, as Figure 7 shown, the support rod 22 will disengage from the limiting rod 235. After the support rod 22 no longer abuts against the limiting rod 235, the limiting rod 235 moves leftward under the pressure of the holding rod 233, so that the limiting rod 235 is not clamped with the holding rod 233, but is slidably connected to the holding rod 233. At this time, let the slider 23 continue to move upward. The first support block 231 continues to expand the circumferential side of the multi-wall tube 1, while the second support block 232 will rotate clockwise under the pressure of the multi-wall tube 1 to expand an axial protrusion 1012 on the end face of the radial protrusion 1011; after the radial protrusion 1011 and the axial protrusion 1012 are expanded and formed, the driving rod 24 and the connecting rod 25 are used to drive the slider 23 to move downward. By using the elastic force of the spring 234, the holding rod 233 and the second support block 232 can be restored to their original positions. By using the abutment of the support rod 22 against the limiting rod 235, the limiting rod 235 can continue to be clamped with the holding rod 233 for the expansion processing of the next protrusion 101.

[0044] As Figure 8As shown, in order to enable the support rod 22 and the abutting rod 233 to push the limiting rod 235 to slide within the first support block 231, it is preferred that both ends of the limiting rod 235 are bevel-shaped; at the same time, in order to improve the clamping effect between the abutting rod 233 and the limiting rod 235 and prevent the limiting rod 235 from contacting the spring 234, it is preferred to provide corresponding grooves on the circumferential side of the abutting rod 233; and in order to prevent the first support block 231, the abutting rod 233, and the limiting rod 235 from rotating during movement, it is preferred that the cross-sections of the support rod 22, the abutting rod 233, and the limiting rod 235 are non-circular.

[0045] As Figure 6 shown, the side of the first support block 231 away from the connecting rod 25 is inclined with respect to the axis of the multi-wall tube 1, and the distance between the two ends of the first support block 231 gradually decreases in the direction away from the support tube 21, so that the expansion operation of the first support block 231 on the multi-wall tube 1 is more labor-saving, and when the slider 23 is retracted, interference between this position on the first support block 231 and the inner wall of the radial protrusion 1011 is avoided.

[0046] Different from the above, the side of the first support block 231 connected to the connecting rod 25 is perpendicular to the axis of the multi-wall tube 1. As Figure 6 shown, when the limiting rod 235 is clamped with the abutting rod 233 and the abutting rod 233 abuts against the second support block 232, the end of the second support block 232 away from the first support block 231 is flush with the side of the first support block 231 connected to the connecting rod 25, which can not only ensure the smooth formation of the axial protrusion 1012, avoid damage to the inner wall of the radial protrusion 1011 by the second support block 232, but also facilitate the calibration of the initial position of the second support block 232; as Figure 7 shown, when the limiting rod 235 is slidably connected to the abutting rod 233, the end of the second support block 232 away from the first support block 231 is pressed and rotated to the side of the first support block 231 close to the connecting rod 25, so as to expand and form the axial protrusion 1012 during the expansion process of the radial protrusion 1011, improving the expansion efficiency of the protrusion portion 101.

[0047] In summary, the setting of the axial protrusion 1012 can not only achieve the above-mentioned fixing effect, avoid delamination of the side wall of the multi-wall tube 1, but also increase the surface area of the metal bellows, thereby enhancing the heat dissipation performance of the metal bellows; however, vibrations exist in many application scenarios of the metal bellows. In order to prevent the metal bellows from flexurally deforming when subjected to vibrations and improve the structural strength of the metal bellows, as Figure 2 shown, the cross-section of the radial protrusion 1011 is made semi-circular, so that the axial protrusion 1012 abuts against the radial protrusion 1011 adjacent to it and not located in the same protrusion portion 101.

[0048] After the processed metal bellows are completed, flange connections are usually required at both ends. Therefore, after the metal bellows are expanded and formed, cutting equipment is needed to cut both ends of the metal bellows. As Figure 14 shown, since the side wall of the multi-wall tube 1 is a multi-layer structure, during its processing or cutting process, delamination problems will occur at the end positions of the multi-wall tube 1, thus affecting the overall performance of the metal bellows; to solve this problem, an additional process is added to the metal bellows processing procedure, that is, in step S1, the length of the tube part located in the innermost part of the multi-wall tube 1 is increased. After multiple tube parts are sleeved together, the two ends of the innermost tube part are flared and flanged. By using the structural changes formed by the flaring and flanging, the connection strength of the multi-layer tube parts is strengthened, and delamination problems are avoided.

[0049] Taking a double-wall copper bellows as an example, as Figure 10 shown, the multi-wall tube 1 includes an inner tube 11 and an outer tube 12. The length of the inner tube 11 is greater than the length of the outer tube 12, and the outer diameter of the inner tube 11 is equal to the inner diameter of the outer tube 12. After the outer tube 12 is sleeved on the inner tube 11, both ends of the inner tube 11 extend out of the outer tube 12. The parts of the inner tube 11 that extend out of the outer tube 12 at both ends are flared, so that the outer diameter of the parts of the inner tube 11 that extend out of the outer tube 12 is equal to the outer diameter of the outer tube 12, thereby realizing the clamping of the end of the outer tube 12 at the flared position and avoiding the problem of relative sliding between the inner tube 11 and the outer tube 12 when the multi-wall tube 1 is expanded.

[0050] Subsequently, the flanging top block 3 is installed on the stamping equipment, and the output end of the stamping equipment is used to push the flanging top block 3 to move, so that the end of the flared part on the inner tube 11 is curled, and the flared part on the inner tube 11 is wound to form a winding part 102. The finally wound winding part 102 is finally abutted against the outer wall of the outer tube 12. By using the abutment of the winding part 102 against the outer tube 12, the connection strength between the outer tube 12 and the inner tube 11 can be effectively improved, and the problem of delamination between the outer tube 12 and the inner tube 11 during the expansion process of the multi-wall tube 1 can be avoided.

[0051] As Figure 11 shown, the cross-section of the winding part 102 is spiral and winds at least one week. When cutting the end of the metal bellows along line m after the metal bellows are expanded, the hollow part above the winding part 102 will be sunken, which not only forms a multi-layer tight connection structure to disperse and absorb the cutting force, but also can provide good support for the positions on both sides of the cutting point of the metal bellows, strengthening the cutting flatness of the end face of the outer tube 12; at the same time, when the cutting equipment cuts to the inner tube 11, by using the abutment of the winding part 102 against the outer tube 12, the deformation of the inner tube 11 can also be avoided, thereby improving the flatness of the cutting plane of the metal bellows; among them, it is preferably that the two cutting surfaces m after the metal bellows are processed respectively coincide with the middle positions of the two winding parts 102.

[0052] As Figure 10 shown, it is preferable that the end faces of the cut inner tube 11 and the outer tube 12 are both conical, the end face of the inner tube 11 is flush with the end face of the outer tube 12, and the length of the cut outer tube 12 is not greater than the length of the cut inner tube 11, so that the condition of the port of the inner tube 11 can be seen outside the metal bellows, facilitating operations such as welding the port of the metal bellows to the flange.

[0053] As Figure 12 and Figure 13 shown, an expansion groove 301 is provided at one end of the flanging top block 3 away from the stamping device. The expansion groove 301 is a frustum-shaped structure, and the inner diameter of the expansion groove 301 near the stamping device is smaller than the inner diameter of the expansion groove 301 away from the stamping device. A flanging groove 302 is provided in the expansion groove 301. The cross-section of the flanging groove 302 is semicircular, and the inner wall of the flanging groove 302 is continuously arranged with the inner wall of the expansion groove 301. When the flanging top block 3 presses the end of the inner tube 11, its end will be curled. When the number of winding turns of the winding part 102 reaches a certain amount, it will abut against the inner wall of the expansion groove 301, thereby abutting the winding part 102 against the outer wall of the outer tube 12 and improving the abutting effect of the winding part 102 on the outer tube 12.

[0054] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A processing method of a metal bellows, characterized in that, It includes the following steps: S1. Sleeve a plurality of pipe fittings together to form a multi-wall pipe (1); S2. Use an expanding device (2) to expand the multi-wall pipe (1), and process a convex portion (101) on the side wall of the multi-wall pipe (1). The convex portion (101) includes a radial convex (1011) and a plurality of axial convexes (1012). Among them, The radial convex (1011) is an annular convex structure; The axial convex (1012) is located at one end of the radial convex (1011) along the axial direction of the multi-wall pipe (1). The axial convex (1012) is integrally formed and continuously arranged with the radial convex (1011) and the multi-wall pipe (1); S3. Move the multi-wall pipe (1) and repeat step S2 to process a plurality of the convex portions (101) on the multi-wall pipe (1). Among them, the moving direction of the multi-wall pipe (1) is the direction from the end of the radial convex (1011) where the axial convex (1012) is provided to the end where the axial convex (1012) is not provided.

2. The processing method of a metal bellows according to claim 1, characterized in that: The expanding device (2) includes a support pipe (21), a plurality of support rods (22), a plurality of sliders (23), a driving rod (24), and a plurality of connecting rods (25). Among them, The support rods (22) are fixedly arranged on the support pipe (21); The sliders (23) are slidably arranged on the support rods (22); The driving rod (24) is slidably arranged in the support pipe (21); Both ends of the connecting rod (25) are rotatably arranged on the slider (23) and the driving rod (24) respectively, and the connecting rod (25) penetrates and is slidably arranged on the support pipe (21). The plurality of connecting rods (25), the plurality of support rods (22), and the plurality of sliders (23) correspond to each other one by one.

3. The processing method of a metal bellows according to claim 2, characterized in that: The slider (23) includes a first support block (231), a second support block (232), a resisting rod (233), a spring (234), and a limiting rod (235). Among them, The first support block (231) is slidably arranged on the support rod (22), and one end of the connecting rod (25) is rotatably arranged on the first support block (231); One end of the second support block (232) is rotatably arranged inside the first support block (231); The resisting rod (233) is slidably arranged inside the first support block (231) and abuts against the second support block (232); The spring (234) is arranged on the first support block (231), and one end of it abuts against the end of the resisting rod (233) away from the second support block (232); The limiting rod (235) is slidably arranged inside the first support block (231). When the support rod (22) is slidably arranged inside the first support block (231), the support rod (22) abuts or does not abut against the limiting rod (235). Among them, When the support rod (22) abuts against the limiting rod (235), the limiting rod (235) is clamped with the resisting rod (233); When the support rod (22) does not abut against the limiting rod (235), the limiting rod (235) is slidably connected to the abutting rod (233).

4. The processing method of a metal bellows according to claim 3, characterized in that: One side of the first support block (231) connected to the connecting rod (25) is perpendicular to the axis of the multi-wall tube (1); When the limiting rod (235) is clamped with the abutting rod (233), one end of the second support block (232) far from the first support block (231) is flush with one side of the first support block (231) connected to the connecting rod (25); when the limiting rod (235) is slidably connected to the abutting rod (233), one end of the second support block (232) far from the first support block (231) is located on one side of the first support block (231) close to the connecting rod (25).

5. The processing method of a metal bellows according to claim 4, characterized in that: One side of the first support block (231) far from the connecting rod (25) is inclined to the axis of the multi-wall tube (1).

6. The processing method of a metal bellows according to claim 3, characterized in that: Both ends of the limiting rod (235) are in the shape of inclined planes.

7. The processing method of a metal bellows according to claim 1, characterized in that: The cross-section of the radial protrusion (1011) is semi-circular; The axial protrusion (1012) abuts against the radial protrusion (1011) adjacent to it and not located in the same protrusion part (101).

8. The processing method of a metal bellows according to claim 1, characterized in that: In step S1, the multi-wall tube (1) includes an inner tube (11) and an outer tube (12). After the outer tube (12) is sleeved on the inner tube (11), the parts of the two ends of the inner tube (11) extending out of the outer tube (12) are first flared, and then a flanging top block (3) and a stamping device are used to flange the flared part of the inner tube (11) to form a winding part (102). The cross-section of the winding part (102) is spiral, and the winding part (102) is abutted and arranged on the side wall of the outer tube (12); One end of the flanging top block (3) far from the stamping device is provided with an expansion groove (301). The expansion groove (301) is a frustum-shaped structure, and the inner diameter of the end close to the stamping device is smaller than the inner diameter of the end far from the stamping device; a flanging groove (302) is arranged in the expansion groove (301). The cross-section of the flanging groove (302) is semi-circular, and its inner wall is continuously arranged with the inner wall of the expansion groove (301).

9. The processing method of a metal bellows according to claim 8, characterized in that: After the metal bellows is processed, both ends of the multi-wall tube (1) are cut, and the cutting surfaces respectively coincide with the middle positions of the two winding parts (102).

10. The processing method of a metal bellows according to claim 9, characterized in that: The end faces of the cut inner tube (11) and the outer tube (12) are both in the shape of conical surfaces. The end face of the inner tube (11) is flush with the end face of the outer tube (12), and the length of the outer tube (12) is not greater than the length of the inner tube (11).

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