Auxiliary welding equipment for composite pipe machining
By combining the design of ring slide and guide rod, the problems of positional displacement and extrusion deformation during composite pipe welding are solved, realizing the alignment clamping and synchronous rotation welding of composite pipe, thus improving the welding effect.
Patent Information
- Application Number
- CN202511492026.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-10-20
- Publication Date
- 2025-12-12
AI Technical Summary
Existing composite pipes are prone to positional displacement and extrusion deformation during welding, and are difficult to clamp and fix, which affects the welding effect.
The design employs a combination of a ring-shaped sliding plate, a first connecting rod, a first slider, a connecting plate, a second slider, a first arc-shaped clamping plate, a sleeve, damping, and a guide rod. Alignment and clamping are achieved through the clamping components that are close to each other. The synchronous movement is achieved by utilizing the resistance of the damping and the guide rod to prevent the composite tube from losing contact. Synchronous rotation welding is achieved through the spline groove and spline block.
It improves the accuracy and stability of composite pipe welding, prevents extrusion deformation, ensures welding effect, and realizes the aligned extrusion contact and synchronous rotation welding of composite pipes.
Smart Images
Figure CN121104538A_ABST
Abstract
Description
Technical Field
[0001] This invention belongs to the technical field of composite pipe processing, and more specifically, it relates to an auxiliary welding device for composite pipe processing. Background Technology
[0002] Currently, composite pipes require welding due to their length. However, the welding process typically involves placing the composite pipe directly on the ground or stepping on it. Since the outer surface of the composite pipe is circular, it is prone to rolling during welding, causing positional shifts and resulting in inaccurate welding positions and poor welding results.
[0003] The existing technology for processing composite pipes still has the following drawbacks: During the welding of composite pipes, it is necessary to clamp and fix the two composite pipes. However, after clamping and fixing the two composite pipes with two clamping components respectively, it is difficult to quickly align and clamp the two composite pipes because the two clamping components are set separately, which affects the welding effect of the two composite pipes.
[0004] Current auxiliary welding equipment typically clamps the outer wall of the composite pipe when clamping and fixing two composite pipes; however, some composite pipes generate high temperatures during the welding process, and the clamping mechanism on the outer wall of the composite pipe can easily cause the composite pipe to be squeezed and deformed.
[0005] In order to prevent the composite pipe from being squeezed and deformed, the auxiliary welding equipment uses a clamping component to support and clamp the inner wall of the composite pipe. However, due to the difference in length between the two composite pipes, in order to improve the welding effect, it is necessary to generate a force that brings the two composite pipes closer to each other during the welding process.
[0006] Therefore, in view of this, we have studied and improved the existing structure and its shortcomings, and provided an auxiliary welding device for composite pipe processing, in order to achieve a more practical and valuable purpose. Summary of the Invention
[0007] This invention provides an auxiliary welding device for composite pipe processing, which overcomes the above-mentioned defects in the prior art.
[0008] The purpose and effectiveness of this invention, an auxiliary welding device for composite pipe processing, are achieved through the following specific technical means: An auxiliary welding device for processing composite pipes includes a worktable. A first movable plate and a second movable plate are slidably mounted on the upper side of the worktable. A control box is installed on one side of the worktable. A circular tube is rotatably mounted on the first movable plate. Two clamping assemblies are symmetrically arranged on the outer walls of both ends of the circular tube. Several sleeves and guide rods are provided on the side of the two clamping assemblies that are close to each other. Each sleeve has internal damping. Each clamping assembly includes several pairs of first sliders and first arc-shaped clamping plates. Several pairs of first sliding grooves are arranged in a circumferential array on the outer walls of both ends of the circular tube. Each pair of first sliders slides axially within each pair of first sliding grooves. A second slider is provided on the inner wall of each pair of first arc-shaped clamping plates. A connecting plate is connected between each pair of first sliders and each pair of second sliders. A first connecting rod is fixedly connected between each pair of first sliders, and a second connecting rod is fixedly connected between each pair of first arc-shaped clamping plates.
[0009] Preferably, two pairs of annular plates are symmetrically arranged on the outer sides of both ends of the circular tube. Each pair of annular plates is provided with several pairs of second sliding grooves arranged in a circumferential array. Two mounting plates are symmetrically and fixedly connected to the inner wall of the annular plates and the outer wall of the circular tube. The outer wall of the guide rod is in sliding contact with the inner wall of the sleeve. Each pair of second sliders slides in each pair of second sliding grooves. One end of each connecting plate is rotatably connected to the first slider, and the other end of each connecting plate is rotatably connected to the second slider.
[0010] Preferably, each end of the circular tube is provided with an annular groove, and an annular sliding plate is axially slidable inside each of the two annular grooves. The outer wall of each annular sliding plate is fixedly connected to several first connecting rods. The annular groove is connected to the middle of the interior of the circular tube, and a first spring is connected between one side of the annular sliding plate and one side of the interior of the annular groove.
[0011] Preferably, a T-shaped rod is slidably provided axially in the middle of the inner side of the circular tube, and a second spring is provided between one end of the T-shaped rod and one end of the inner side of the circular tube.
[0012] Preferably, the outer wall of the end of the circular tube near the first movable plate is provided with a first disk, and the inner circumferential array of the first disk is provided with a plurality of first cavities. A first push rod is radially slidably provided inside each first cavity. A second arc-shaped clamp is provided at one end of each first push rod, and a first compression spring is connected between the other end of each first push rod and the interior of the first cavity.
[0013] Preferably, a circular plate is rotatably provided on the second movable plate, and a second disk is provided on one side of the circular plate. A plurality of second cavities are arranged in a circular array inside the second disk. A second push rod is radially slidably provided inside each second cavity. A third arc-shaped clamp is provided at one end of each second push rod, and a second compression spring is provided at the other end of each second push rod connected to the inside of the second cavity.
[0014] Preferably, the second disk has a through hole in the middle, and two spline grooves are symmetrically arranged on both sides of the inner wall of the through hole. The outer wall of one end of the round tube is in sliding contact with the inner wall of the through hole. Two spline blocks are symmetrically fixed on the outer wall of one end of the round tube, and the two spline blocks slide axially in the two spline grooves respectively.
[0015] Preferably, a first stepper motor is mounted on the first movable plate, and the output end of the first stepper motor is connected to one end of the circular tube.
[0016] Preferably, two guide rails are symmetrically fixed on the upper side of the worktable, the first movable plate slides on the two guide rails, and the second movable plate slides on the two guide rails.
[0017] Preferably, a fixed plate is fixedly provided on the upper side of each end of the worktable, and a second stepper motor is installed on each of the two fixed plates. A lead screw is provided at the output end of each of the two second stepper motors, and the outer wall of the two lead screws is in threaded contact with the first movable plate and the second movable plate, respectively.
[0018] Compared with the prior art, the present invention has the following beneficial effects: 1. An auxiliary welding device for composite pipe processing according to the present invention, comprising annular sliding plates, a first connecting rod, a first slider, a connecting plate, a second slider, a first arc-shaped clamping plate, sleeves, damping, and guide rods, firstly, by bringing two annular sliding plates closer together, two clamping components are brought closer together, thereby causing several guide rods to move axially within several sleeves, achieving aligned movement of the two clamping components, which is beneficial for subsequent synchronous clamping and fixing of the inner walls of the two composite pipes. Secondly, by using several guide rods to move axially within several sleeves, and using damping to resist the approach of the two clamping components, the first arc-shaped clamping plate moves radially outward under the action of the rotating connecting plate; thus, under the resistance of several dampers, during the process of the two annular sliding plates approaching each other, several pairs of first arc-shaped clamping plates in the two clamping components move synchronously radially outward, thereby achieving aligned clamping and fixing of the two composite pipes, which is beneficial for improving the welding effect of the two composite pipes. Finally, the two annular sliding plates continue to move closer together, and several pairs of first-arc clamping plates in the two clamping assemblies are pressed against the inner wall of the composite tube, thereby bringing the two clamping assemblies closer together. This causes the guide rod to slide within the sleeve, further compressing the damping mechanism. Furthermore, the continued approach of the two clamping assemblies drives the two composite tubes closer together, bringing them into contact and achieving aligned, compressed contact. This prevents the two composite tubes from separating during the annular welding process, thus improving the welding effect.
[0019] 2. An auxiliary welding device for composite pipe processing according to the present invention, through the arrangement of a second arc-shaped clamping plate, a third arc-shaped clamping plate, and clamping components, uses several second arc-shaped clamping plates, third arc-shaped clamping plates, and two clamping components to align and clamp the inner walls of two composite pipes, thereby preventing the composite pipes from being squeezed and deformed. Furthermore, through the arrangement of through holes, spline grooves, and spline blocks, the rotation of the round pipe drives the rotation of the two spline blocks. The two spline blocks slide axially within the two spline grooves, thereby causing the two clamping components to rotate synchronously with the first and second discs, facilitating the synchronous rotation of the two composite pipes. This allows the welding machine to perform circumferential welding on the two composite pipes. Attached Figure Description
[0020] To more clearly illustrate the technical solutions in the embodiments of the invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.
[0021] The present invention will be further described below with reference to the accompanying drawings and embodiments.
[0022] Figure 1This is a schematic diagram of the isometric structure of the present invention; Figure 2 This is an isometric structural diagram of the clamping component in this invention; Figure 3 This is an isometric structural diagram of the second disk in this invention; Figure 4 This is a top view of the structure of the present invention; Figure 5 for Figure 4 Schematic diagram of the cross-sectional structure at point AA; Figure 6 This is a front view structural diagram of the present invention; Figure 7 for Figure 6 Schematic diagram of the cross-sectional structure at point BB; Figure 8 This is a front view of the clamping component in this invention. Figure 9 for Figure 8 Schematic diagram of the cross-sectional structure at the CC section; Figure 10 for Figure 9 A magnified schematic diagram of the local structure at point D; Figure 11 for Figure 9 A magnified schematic diagram of the structure at point E in the middle.
[0023] Explanation of reference numerals in the attached figures. Workbench 10, control box 11, 12, first movable plate 13, second movable plate 14, round tube 15, first disc 16, first cavity 17, first push rod 18, first compression spring 19, second arc-shaped clamping plate 20, round plate 21, second disc 22, second cavity 23, second push rod 24, third arc-shaped clamping plate 25, second compression spring 26, through hole 27, spline groove 28, spline block 29, first slide groove 30, first slider 31, connecting plate 32, first arc-shaped clamping plate 33, first connecting rod 34, annular slide groove 35, annular slide plate 36, first spring 37, annular plate 38, mounting plate 39, second slide groove 40, T-shaped rod 41, second spring 42, sleeve 43, damping 44, guide rod 45, second connecting rod 46, first stepper motor 47, second stepper motor 48, fixed plate 49, lead screw 50, guide rail 51, second slider 52. Detailed Implementation
[0024] The embodiments of the present invention will be described in further detail below with reference to the accompanying drawings and examples. The following examples are for illustrative purposes only and should not be construed as limiting the scope of the invention.
[0025] In the description of this invention, unless otherwise stated, "a plurality of" means two or more; the terms "upper," "lower," "left," "right," "inner," "outer," "front end," "rear end," "head," "tail," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the invention. Furthermore, the terms "first," "second," "third," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance.
[0026] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "connected" and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.
[0027] like Figures 1 to 11 As shown, This invention provides an auxiliary welding device for composite pipe processing.
[0028] like Figures 1 to 11 As shown, the system includes a workbench 10, with a first movable plate 13 and a second movable plate 14 slidably mounted on the upper side of the workbench 10. A control box 11 is installed on one side of the workbench 10. A circular tube 15 is rotatably mounted on the first movable plate 13. Two clamping assemblies are symmetrically mounted on the outer walls of both ends of the circular tube 15. Several sleeves 43 and guide rods 45 are provided on the side of the two clamping assemblies that are close to each other. Each sleeve 43 has a damping 44 inside. The clamping assembly includes several pairs of first sliders 31 and first arc clamping plates 33. Several pairs of first sliding grooves 30 are circumferentially arrayed on the outer walls of both ends of the circular tube 15. Each pair of first sliders 31 slides axially in each pair of first sliding grooves 30. A second slider 52 is provided on the inner wall of each pair of first arc clamping plates 33. A connecting plate 32 is connected between each pair of first sliders 31 and each pair of second sliders 52. A first connecting rod 34 is fixedly connected between each pair of first sliders 31. A second connecting rod 46 is fixedly connected between each pair of first arc clamping plates 33.
[0029] Specifically, by first bringing two annular sliding plates 36 close to each other, the two clamping components can be brought close to each other, thereby allowing several guide rods 45 to move axially within several sleeves 43, achieving aligned movement of the two clamping components, which is beneficial for subsequent synchronous clamping and fixing of the inner walls of the two composite tubes.
[0030] Then, several guide rods 45 move axially within several sleeves 43, and damping 44 causes the two clamping components to approach each other and be resisted. As a result, under the action of the rotation of the connecting plate 32, the first arc-shaped clamping plate 33 moves radially outward. This allows several pairs of first arc-shaped clamping plates 33 in the two clamping components to move radially outward synchronously under the resistance of several damping 44 as the two annular sliding plates 36 approach each other. This achieves the alignment and clamping of the two composite pipes, which is beneficial to improving the welding effect of the two composite pipes.
[0031] Finally, the two annular sliding plates 36 continue to move closer together, and several pairs of first-arc clamping plates 33 in the two clamping assemblies are pressed against the inner wall of the composite tube, thereby bringing the two clamping assemblies closer together. This causes the guide rod 45 to slide within the sleeve 43, further compressing the damper 44. The continued approach of the two clamping assemblies also drives the two composite tubes closer together, bringing them into contact and achieving aligned, compressed contact. This prevents the two composite tubes from separating during the annular welding process, thus improving the welding effect.
[0032] Preferred, such as Figure 2 , Figure 7 , Figures 9 to 11 As shown, two pairs of annular plates 38 are symmetrically arranged on the outer sides of the two ends of the circular tube 15. Several pairs of second sliding grooves 40 are arranged in a circumferential array on each pair of annular plates 38. Two mounting plates 39 are symmetrically fixedly connected to the inner wall of the annular plates 38 and the outer wall of the circular tube 15. The outer wall of the guide rod 45 slides in contact with the inner wall of the sleeve 43. Each pair of second sliders 52 slides in each pair of second sliding grooves 40. One end of each connecting plate 32 is rotatably connected to the first slider 31, and the other end of each connecting plate 32 is rotatably connected to the second slider 52.
[0033] Preferred, such as Figures 9 to 11 As shown, an annular groove 35 is provided inside each of the two ends of the circular tube 15. An annular slide plate 36 is axially slidable inside each of the two annular grooves 35. The outer wall of each annular slide plate 36 is fixedly connected to several first connecting rods 34. The annular groove 35 is connected to the middle of the interior of the circular tube 15. A first spring 37 is connected between one side of the annular slide plate 36 and one side of the interior of the annular groove 35.
[0034] Preferred, such as Figures 9 to 11 As shown, a T-shaped rod 41 is axially slidably provided in the middle of the inner side of the circular tube 15, and a second spring 42 is provided between one end of the T-shaped rod 41 and the middle end of the inner side of the circular tube 15.
[0035] Preferred, such as Figure 2 , Figure 7As shown, a first disc 16 is provided on the outer wall of one end of the circular tube 15 near the first movable plate 13. A plurality of first cavities 17 are arranged in a circular array inside the first disc 16. A first push rod 18 is radially slidably provided inside each first cavity 17. A second arc-shaped clamping plate 20 is provided at one end of each first push rod 18. A first compression spring 19 is connected between the other end of each first push rod 18 and the inside of the first cavity 17.
[0036] Preferred, such as Figure 3 , Figure 7 As shown, a circular plate 21 is rotatably mounted on the second movable plate 14. A second disc 22 is mounted on one side of the circular plate 21. Several second cavities 23 are arranged in a circular array inside the second disc 22. A second push rod 24 is radially slidably mounted inside each second cavity 23. A third arc-shaped clamping plate 25 is mounted at one end of each second push rod 24. A second compression spring 26 is connected to the inside of each second cavity 23 at the other end of each second push rod 24.
[0037] Preferred, such as Figure 2 , Figure 3 , Figure 7 As shown, the second disc 22 has a through hole 27 in the middle, and two spline grooves 28 are symmetrically arranged on both sides of the inner wall of the through hole 27. The outer wall of one end of the round tube 15 slides in contact with the inner wall of the through hole 27. Two spline blocks 29 are symmetrically fixed on the outer wall of one end of the round tube 15. The two spline blocks 29 slide axially in the two spline grooves 28 respectively.
[0038] Preferred, such as Figure 1 , Figure 2 As shown, a first stepper motor 47 is installed on the first movable plate 13, and the output end of the first stepper motor 47 is connected to one end of the circular tube 15.
[0039] Preferred, such as Figure 1 As shown, two guide rails 51 are symmetrically fixed on the upper side of the workbench 10. The first movable plate 13 slides on the two guide rails 51, and the second movable plate 14 slides on the two guide rails 51.
[0040] Preferred, such as Figure 1 As shown, a fixed plate 49 is fixed on the upper side of each end of the worktable 10. A second stepper motor 48 is installed on each of the two fixed plates 49. A lead screw 50 is provided at the output end of each of the two second stepper motors 48. The outer walls of the two lead screws 50 are in threaded contact with the first movable plate 13 and the second movable plate 14, respectively.
[0041] Specific usage method of the present invention, First, the operator presses several second arc-shaped clamps 20 and moves them radially inward. This movement causes the first push rod 18 to move radially inward, compressing the first compression spring 19 and generating elastic force. One of the composite tubes is then moved through the outside of the circular tube 15 to the outside of the first disc 16. The operator then releases the second arc-shaped clamps 20. Under the elastic force of the first compression springs 19, the first push rods 18 and the second arc-shaped clamps 20 move radially outward, using this movement to initially clamp and fix the inner wall of one end of the composite tube.
[0042] Simultaneously, the operator presses several third arc-shaped clamping plates 25 to move radially inward. This radial inward movement of the third arc-shaped clamping plates 25 causes several second push rods 24 to move radially inward. The radial inward movement of the second push rods 24 compresses the second compression springs 26, generating elastic force and placing the other composite tube outside the second disc 22. The operator then releases the third arc-shaped clamping plates 25. Under the elastic force of the second compression springs 26, the second push rods 24 and the third arc-shaped clamping plates 25 move radially outward, using this radial outward movement of the third arc-shaped clamping plates 25 to initially clamp and fix the inner wall of one end of the other composite tube.
[0043] Secondly, the two second stepper motors 48 start, driving the two lead screws 50 to rotate. The outer walls of the two lead screws 50 make threaded contact with the first movable plate 13 and the second movable plate 14 respectively, thus guiding them towards each other. As the first and second movable plates 13 and 14 approach each other, one end of the T-shaped rod 41 contacts the circular plate 21, causing the other end of the T-shaped rod 41 to move axially within the central part of the circular tube 15. This axial movement of the other end of the T-shaped rod 41 forces the solution inside the circular tube 15 into the two annular grooves 35, using the solution to push the two annular sliding plates 36 closer together. The approaching of the two annular sliding plates 36 compresses the two first springs 37, generating elastic force. Under the action of the elastic force of the two first springs 37, the two annular sliding plates 36 are able to move away from each other.
[0044] Next, the annular slide plate 36 moves axially within the annular groove 35, causing several first connecting rods 34 to move axially. The axial movement of the first connecting rods 34 then causes several pairs of first sliders 31 to move axially. The two annular slide plates 36 approach each other, causing the two clamping assemblies to approach each other. The approaching of the two clamping assemblies causes several guide rods 45 to slide within several sleeves 43. One end of the guide rod 45 slides axially within the sleeve 43, compressing against the damper 44 to generate elastic force, and is held in place by the damper 44.
[0045] At this point, the two clamping components approach each other and encounter resistance. Due to the rotational connection of several connecting plates 32, several pairs of first-arc clamping plates 33 move radially outward, thereby using the two clamping components to clamp and fix the inner walls of the two composite tubes respectively. This allows the guide rod 45 to slide axially within the sleeve 43, enabling the two clamping components to move synchronously radially outward to clamp and fix the two composite tubes, achieving an aligned clamping and fixing effect, which is beneficial for improving the welding effect of the two composite tubes.
[0046] The two annular sliding plates 36 continue to move closer to each other, causing the two clamping components to move closer to each other as well. By using the two clamping components to move closer to each other, the two composite tubes move closer to each other, thereby bringing the two composite tubes into contact and achieving aligned and compressed contact, which is beneficial to improving the welding effect of the two composite tubes.
[0047] Finally, after the two composite tubes are fully aligned and clamped, one end of the round tube 15 slides within the through hole 27, and the two spline blocks 29 slide within the two spline grooves 28 respectively. The first stepper motor 47 starts and drives the round tube 15 to rotate. The rotation of the round tube 15 drives the two spline blocks 29 to rotate. By utilizing the axial sliding of the two spline blocks 29 within the two spline grooves 28 respectively, the two clamping components rotate synchronously with the first disc 16 and the second disc 22, so that the two composite tubes can rotate synchronously, thereby enabling the welding machine to perform circumferential welding on the two composite tubes.
[0048] The embodiments of the present invention are given for illustrative and descriptive purposes only, and are not intended to be exhaustive or to limit the invention to the forms disclosed. Many modifications and variations will be apparent to those skilled in the art. The embodiments were chosen and described in order to better illustrate the principles and practical application of the invention, and to enable those skilled in the art to understand the invention and to design various embodiments with various modifications suitable for a particular purpose.
Claims
1. An auxiliary welding apparatus for composite pipe processing, characterized by, The utility model provides a kind of pipe clamping device, including workbench (10), the upper side of the workbench (10) is slidably equipped with first movable plate (13) with second movable plate (14), one side of the workbench (10) is equipped with control box (11), the first movable plate (13) is rotatably equipped with circular tube (15), the outer wall of the two ends of the circular tube (15) is symmetrically equipped with two clamping components, the side of two the clamping components each other is equipped with several sleeves (43) with guide rod (45), the inside of each the sleeve (43) is equipped with damping (44); The clamping component includes several pairs of first sliding block (31), first radian clamping plate (33), the outer wall of the two ends of the circular tube (15) is circumferentially arrayed with several pairs of first sliding slot (30), each pair of the first sliding block (31) is axially slid in each pair of the first sliding slot (30) respectively, the inner wall of each pair of the first radian clamping plate (33) is equipped with a second sliding block (52) respectively, one connecting plate (32) is connected between each pair of the first sliding block (31) and each pair of the second sliding block (52) respectively, first connecting rod (34) is fixedly connected between each pair of the first sliding block (31), second connecting rod (46) is fixedly connected between each pair of the first radian clamping plate (33).
2. The auxiliary welding apparatus for composite pipe processing according to claim 1, wherein The outer wall of the guide rod (45) and the inner wall of the sleeve (43) are in sliding contact, each pair of the second sliding block (52) is slid in each pair of the second sliding slot (40) respectively, one end of each the connecting plate (32) is rotatably connected with the first sliding block (31), the other end of each the connecting plate (32) is rotatably connected with the second sliding block (52).
3. The auxiliary welding apparatus for composite pipe processing according to claim 1, wherein The inner part of the two the annular sliding slots (35) is axially slidably equipped with one annular sliding plate (36) respectively, the outer wall of each the annular sliding plate (36) is fixedly connected with several the first connecting rod (34), the annular sliding slot (35) and the inner part of the circular tube (15) are in communication, first spring (37) is connected between one side of the annular sliding plate (36) and one side of the inner part of the annular sliding slot (35).
4. The auxiliary welding apparatus for composite pipe processing according to claim 1, wherein The inner part of the two the annular sliding slots (35) is axially slidably equipped with one annular sliding plate (36) respectively, the outer wall of each the annular sliding plate (36) is fixedly connected with several the first connecting rod (34), the annular sliding slot (35) and the inner part of the circular tube (15) are in communication, first spring (37) is connected between one side of the annular sliding plate (36) and one side of the inner part of the annular sliding slot (35). The inner part of the two the annular sliding slots (35) is axially slidably equipped with one annular sliding plate (36) respectively, the outer wall of each the annular sliding plate (36) is fixedly connected with several the first connecting rod (34), the annular sliding slot (35) and the inner part of the circular tube (15) are in communication, first spring (37) is connected between one side of the annular sliding plate (36) and one side of the inner part of the annular sliding slot (35).
5. The auxiliary welding apparatus for composite pipe fabrication of claim 1, wherein, The outer wall of one end of the circular tube (15) close to the first movable plate (13) is provided with a first disc (16), the inner circumferential array of the first disc (16) is provided with a plurality of first cavities (17), the inner part of each first cavity (17) is radially slidably provided with a first push rod (18), one end of each first push rod (18) is provided with a second arc-shaped clamping plate (20), and the other end of each first push rod (18) is connected with the inner part of the first cavity (17) and is provided with a first compression spring (19).
6. The auxiliary welding apparatus for composite pipe fabrication of claim 1, wherein, The second movable plate (14) is rotatably provided with a disc (21), one side of the disc (21) is provided with a second disc (22), the inner circumferential array of the second disc (22) is provided with a plurality of second cavities (23), the inner part of each second cavity (23) is radially slidably provided with a second push rod (24), one end of each second push rod (24) is provided with a third arc-shaped clamping plate (25), and the other end of each second push rod (24) is connected with the inner part of the second cavity (23) and is provided with a second compression spring (26).
7. The auxiliary welding apparatus for composite pipe fabrication of claim 6, wherein, The middle of the second disc (22) is provided with a through hole (27), the inner wall of the through hole (27) is symmetrically provided with two spline grooves (28), one end of the outer wall of the circular tube (15) is in sliding contact with the inner wall of the through hole (27), and the outer wall of one end of the circular tube (15) is symmetrically fixedly provided with two spline blocks (29), and the two spline blocks (29) are respectively axially slid in the two spline grooves (28).
8. The auxiliary welding apparatus for composite pipe fabrication of claim 1, wherein, The first movable plate (13) is provided with a first stepping motor (47), and the output end of the first stepping motor (47) is connected with one end of the circular tube (15).
9. The auxiliary welding apparatus for composite pipe fabrication of claim 1, wherein, The upper side of the workbench (10) is symmetrically fixedly provided with two guide rails (51), the first movable plate (13) slides on the two guide rails (51), and the second movable plate (14) slides on the two guide rails (51).
10. The auxiliary welding apparatus for composite pipe fabrication of claim 9, wherein, The upper side of both ends of the workbench (10) is respectively fixedly provided with a fixed plate (49), the two fixed plates (49) are respectively provided with a second stepping motor (48), the output ends of the two second stepping motors (48) are respectively provided with a lead screw (50), and the outer walls of the two lead screws (50) are respectively in threaded contact with the first movable plate (13) and the second movable plate (14).