Composite pipe machining, bending and prefabricating device and prefabricating method

Abstract

The invention is suitable for the technical field of pipe machining devices, and provides a composite pipe machining, bending and prefabricating device and prefabricating method.The bending and prefabricating device comprises a supporting roller used for supporting a composite pipe; the bending assembly is used for pressing down a pipe section between one end of the composite pipe and the supporting roller to bend the pipe section; the first sealing piece and the second sealing piece are located at the two ends of the composite pipe respectively and used for sealing pipe openings in the two ends of the composite pipe, and the first sealing piece can be fixedly connected with one end of the composite pipe and move along with the end of the composite pipe during bending; by arranging the supporting roller, the bending assembly, the first sealing piece, the second sealing piece and the air inflation assembly, pipe openings in the two ends of the composite pipe are sealed through the first sealing piece and the second sealing piece, the air inflation assembly is used for inflating the composite pipe during bending, so that the air pressure in the composite pipe is increased, and therefore the composite pipe can be bent, and the air pressure in the composite pipe can be increased. The inner wall is supported, pipe collapse or section deformation is reduced, and the bending quality is improved.

Description

Technical Field

[0001] The present invention belongs to the technical field of pipe processing devices, and particularly relates to a bending prefabrication device and a prefabrication method for composite pipe processing. Background Art

[0002] In the field of pipe processing, composite pipes are widely used in fields such as automobile manufacturing, aerospace, and building pipelines due to their light weight, high strength, and corrosion resistance. However, there are significant technical challenges in the bending process of composite pipes. Since composite pipes are usually composed of multiple layers of materials (such as metal and plastic, carbon fiber and resin, etc.), their structural characteristics cause traditional bending processes to easily lead to problems such as pipe collapse, cross-section deformation, delamination, or wrinkling, seriously affecting the quality and mechanical properties of the finished product.

[0003] In the prior art, methods such as external mold support or filling with low melting point materials are usually used to reduce bending deformation. For example, the outer wall of the pipe is constrained by a rigid mold, or temporary supports such as sand or wax are filled in the pipe cavity. However, these methods have obvious limitations: the adaptability of the external mold is poor, and it is difficult to meet the requirements of different pipe diameters and bending angles; the filler needs to be cleaned up later, increasing the complexity and cost of the process. Summary of the Invention

[0004] The present invention provides a bending prefabrication device for composite pipe processing, aiming to solve the above problems.

[0005] The present invention is implemented as follows. A bending prefabrication device for composite pipe processing includes: Support rollers for supporting the composite pipe; A bending assembly for pressing down the pipe section between one end of the composite pipe and the support roller to bend it; A first sealing member and a second sealing member respectively located at both ends of the composite pipe for sealing the pipe orifices at both ends of the composite pipe. During bending, the first sealing member can be fixedly connected to one end of the composite pipe and move along with one end of the composite pipe; An inflation assembly for inflating the composite pipe during bending to increase the air pressure inside the composite pipe.

[0006] Preferably, the bending assembly includes: A bending plate located above the composite pipe; A driving mechanism for driving the bending plate to press down the composite pipe.

[0007] Preferably, electric heating elements are respectively installed inside the bending plate and the support roller for heating the composite pipe.

[0008] Preferably, the driving mechanism includes: A turntable rotatably mounted on a frame, the turntable being located at the rear side of the composite pipe, the support rollers being rotatably mounted coaxially on the surface of the turntable, and a power member for driving the turntable to rotate being mounted on the frame; A mounting block slidably mounted on the surface of the turntable along the radial direction of the turntable, and the middle part of the bending plate being hingedly mounted on the mounting block.

[0009] Preferably, the power member includes: A stepping motor fixed to the frame; A driving gear fixed to the output shaft of the stepping motor, and a gear ring meshing with the driving gear being provided on the circumferential wall of the turntable.

[0010] Preferably, an adjusting block is provided on the turntable on the sliding path of the mounting block, an adjusting screw rod being rotatably mounted on the side surface of the adjusting block away from the mounting block, the adjusting screw rod being arranged along the radial direction of the mounting disc and being threadedly connected with the mounting disc.

[0011] Preferably, the first sealing member is mounted on the first side frame, and the first side frame includes: A first telescopic rod vertically fixed to the frame, a first side plate being fixed to the first telescopic rod; A second telescopic rod horizontally fixed to the first side plate, a first mounting plate being fixed to the telescopic end of the second telescopic rod, the first sealing member being located on the side of the first mounting plate close to the support roller, a winch being fixedly mounted on the other side of the first mounting plate, a towing rope being wound around the winch, and the towing rope passing through a through hole on the first mounting plate and being connected with the first sealing member.

[0012] Preferably, the second sealing member is mounted on the second side frame, and the second side frame includes: A fifth telescopic rod vertically fixed to the frame, a second side plate being fixed to the fifth telescopic rod; A fourth telescopic rod horizontally fixed to the second side plate, a second mounting plate being fixed to the telescopic end of the fourth telescopic rod, and the second sealing member being fixed to the side wall of the second mounting plate close to the support roller.

[0013] Preferably, the first sealing member and the second sealing member have the same structure, and both include: A mounting cylinder, one end of which close to the support roller is open A positioning frustum coaxially arranged in the mounting cylinder and connected to its end wall for inserting into the composite pipe for positioning, a sealing sleeve being sleeved on the surface of the positioning frustum; A plurality of electric push rods circumferentially and spacedly fixed on the mounting cylinder and along the radial direction of the mounting cylinder, a pressing plate being fixed to one end of the electric push rod close to the positioning frustum for pressing and fixing the composite pipe, and a rubber pad being provided on the surface of the pressing plate close to the positioning frustum; The traction rope is connected to the center of the end wall of the first sealing member.

[0014] Preferably, the inflation assembly includes: A cylinder body fixed to the frame and located on one side of the driving gear; A first piston and a second piston disposed in the cylinder body. A compression spring is fixedly connected between the first piston and the second piston. The second piston is located at one end of the cylinder body close to the driving gear; A threaded pipe fixed to the second piston. The threaded pipe penetrates through one end of the cylinder body and extends to the outside thereof. An external threaded rod is threadedly connected in the threaded pipe. The external threaded rod is rotatably connected to the frame. The external threaded rod is drivingly connected to the driving gear through a bevel gear pair; An air pipe connected to the other end of the cylinder body. The other end of the air pipe communicates with the inner cavity of the positioning frustum of the second sealing member. An air hole is provided at the head of the positioning frustum.

[0015] The present invention also provides a prefabrication method using the above-mentioned composite pipe processing and bending prefabrication device, including the following steps: Place the composite pipe on the support roller; Seal the pipe orifices at both ends of the composite pipe through the first sealing member and the second sealing member; Start the bending assembly, press down the pipe section between one end of the composite pipe and the support roller to bend it; Meanwhile, the inflation assembly is used to inflate the composite pipe to increase the air pressure inside the composite pipe.

[0016] Compared with the prior art, the embodiments of the present application mainly have the following beneficial effects: The composite pipe processing and bending prefabrication device provided by the present invention seals the pipe orifices at both ends of the composite pipe through the first sealing member and the second sealing member. When bending, it is used to inflate the composite pipe to increase the air pressure inside the composite pipe, support the inner wall, reduce the collapse or cross-sectional deformation of the pipe material, and improve the bending quality. Description of the Drawings

[0017] Figure 1 is a schematic structural diagram of a composite pipe processing and bending prefabrication device provided by the present invention.

[0018] Figure 2 is Figure 1 The enlarged view at A in

[0019] Figure 3 is Figure 1 The enlarged view at B in

[0020] Figure 4 is Figure 1 The enlarged view at C in

[0021] Annotation of reference numerals: 1, frame; 2, first telescopic rod; 3, first side plate; 4, second telescopic rod; 5, winch; 6, towing rope; 7, first mounting plate; 8, first seal; 9, positioning round table; 10, electric push rod; 11, turntable; 12, mounting block; 13, adjusting block; 14, adjusting screw; 15, bending plate; 16, third telescopic rod; 17, second seal; 18, second side plate; 19, second mounting plate; 20, fourth telescopic rod; 21, air pipe; 22, guide roller; 23, fifth telescopic rod; 24, electric heating element; 25, cylinder block; 26, first piston; 27, compression spring; 28, second piston; 29, threaded pipe; 30, external threaded rod; 31, driving gear; 32, support roller; 33, bevel gear pair; 34, pressing plate. Detailed implementation manners

[0022] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those of ordinary skill in the technical field to which this application belongs; the terms used in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" and any variations thereof in the specification and claims of this application and the above drawings are intended to cover non-exclusive inclusion. The terms "first", "second", etc. in the specification and claims of this application or the above drawings are used to distinguish different objects and are not used to describe a specific order.

[0023] Reference to "embodiment" herein means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of this application. The phrase does not necessarily refer to the same embodiment at various places in the specification, nor is it an independent or alternative embodiment mutually exclusive with other embodiments. Those skilled in the art will explicitly and implicitly understand that the embodiments described herein can be combined with other embodiments.

[0024] An embodiment of the present invention provides a composite pipe processing and bending prefabrication device, as Figures 1-4 shown, including: A support roller 32 for supporting the composite pipe; A bending assembly for pressing down the pipe section between one end of the composite pipe and the support roller 32 to bend it; A first seal 8 and a second seal 17 respectively located at both ends of the composite pipe for closing the pipe orifices at both ends of the composite pipe. During bending, the first seal 8 can be fixedly connected to one end of the composite pipe and move with one end of the composite pipe; An inflation assembly for inflating the composite pipe during bending to increase the air pressure inside the composite pipe, support the inner wall, reduce the collapse of the pipe material or cross-section deformation, and improve the bending quality.

[0025] During operation, place the composite pipe on the support roller 32 (it can be loaded and unloaded by a manipulator), then seal the pipe openings at both ends of the composite pipe through the first seal 8 and the second seal 17. Next, start the bending assembly to press down and bend the pipe section between one end of the composite pipe and the support roller 32. At the same time, the inflation assembly is used to inflate the composite pipe to increase the air pressure inside the composite pipe.

[0026] Among them, the bending assembly includes: A bending plate 15 located above the composite pipe; A driving mechanism for driving the bending plate 15 to press down the composite pipe.

[0027] Preferably, electric heating elements 24 can be installed inside the bending plate 15 and the support roller 32 respectively to heat the composite pipe, which is convenient for bending and improves the bending quality. The electric heating elements 24 can be electrically connected to an external controller, and the heating temperature can be set according to requirements.

[0028] Furthermore, the driving mechanism includes: A turntable 11 rotatably installed on the frame 1. The turntable 11 is located behind the composite pipe. The support roller 32 is rotatably installed coaxially on the surface of the turntable 11. A power component for driving the turntable 11 to rotate is installed on the frame 1; An installation block 12 slidably installed on the surface of the turntable 11 along the radial direction of the turntable 11. Preferably, a sliding groove for the installation block 12 to slide is provided on the turntable 11. The middle part of the bending plate 15 is hingedly installed on the installation block 12; Initially, as Figure 1 shown, during bending, the power component drives the turntable 11 to rotate. The turntable 11 drives the installation block 12 to rotate. The installation block 12 drives the bending plate 15 to move along the length direction of the composite pipe to partially heat the composite pipe until the installation block 12 slides to the end of the stroke. Then, the bending plate 15 presses down the composite pipe to bend the composite pipe. The bending angle can be adjusted by designing the angle by which the power component drives the turntable 11 to rotate.

[0029] In a more specific implementation, the power component includes: A stepping motor (not shown in the figure) fixed to the frame 1, which can be fixed by bolts; A driving gear 31 fixed to the output shaft of the stepping motor. A toothed ring meshing with the driving gear 31 is provided on the circumferential wall of the turntable 11.

[0030] During operation, start the stepping motor. The stepping motor drives the driving gear 31, and the driving gear 31 drives the turntable 11 to rotate through the toothed ring.

[0031] Further, an adjusting block 13 is provided on the turntable 11 on the sliding path of the mounting block 12. An adjusting screw 14 is rotatably mounted on the side of the adjusting block 13 away from the mounting block 12. The adjusting screw 14 is arranged along the radial direction of the mounting disc and is threadedly connected to the mounting disc.

[0032] It can be understood that by rotating the adjusting screw 14, the position of the adjusting block 13 is changed, so as to adjust the end position of the stroke of the mounting block 12, thereby adjusting the stroke of the bending plate 15 and adjusting the position where the bending plate 15 presses down on the composite pipe.

[0033] In this embodiment, the first sealing member 8 is mounted on the first side frame, and the first side frame includes: A first telescopic rod 2 vertically fixed to the frame 1, preferably an electric telescopic rod, and a first side plate 3 is fixed on the first telescopic rod 2; A second telescopic rod 4 horizontally fixed to the first side plate 3. The telescopic end of the second telescopic rod 4 is fixed with a first mounting plate 7. The first sealing member 8 is located on the side of the first mounting plate 7 close to the supporting roller 32. A winch 5 is fixedly mounted on the other side of the first mounting plate 7. A towing rope 6 is wound around the winch 5. The towing rope 6 passes through the perforation on the first mounting plate 7 and is connected to the first sealing member 8; During operation, the first sealing member 8 is fixedly connected to the composite pipe. First, the winch 5 pays out the towing rope 6, and then the second telescopic rod 4 shortens, so that the first mounting plate 7 moves away from the first sealing member 8. Thus, when the composite pipe is bent, the first sealing member 8 can move along with the composite pipe and seal the composite pipe at the same time.

[0034] Further, in this embodiment, the second sealing member 17 is mounted on the second side frame, and the second side frame includes: A fifth telescopic rod 23 vertically fixed to the frame 1, and a second side plate 18 is fixed on the fifth telescopic rod 23; A fourth telescopic rod 20 horizontally fixed to the second side plate 18. The telescopic end of the fourth telescopic rod 20 is fixed with a second mounting plate 19. The second sealing member 17 is fixed on the side wall of the second mounting plate 19 close to the supporting roller 32.

[0035] During operation, the second sealing member 17 is fixedly connected to the composite pipe to improve the stability during bending.

[0036] In this embodiment, the first sealing member 8 and the second sealing member 17 have the same structure, and both include: An installation cylinder, one end of which close to the supporting roller 32 is open A positioning frustum 9 coaxially arranged in the installation cylinder and connected to its end wall, which is used for inserting into the composite pipe for positioning. A sealing sleeve is sleeved on the surface of the positioning frustum 9; A plurality of electric push rods 10 that are circumferentially spaced and fixed on the mounting cylinder and radially along the mounting cylinder. One end of the electric push rod 10 close to the positioning frustum 9 is fixed with a pressing plate 34 for tightly fixing the composite pipe. A rubber pad is provided on the surface of the pressing plate 34 close to the positioning frustum 9 to play a certain protective role; The traction rope 6 is tied to the center of the end wall of the first sealing member 8.

[0037] It should be explained that when the composite pipe is placed on the support roller 32, the second telescopic rod 4 and the fourth telescopic rod 20 are extended, so that the positioning frustums 9 of the first sealing member 8 and the second sealing member 17 enter both ends of the composite pipe to seal the composite pipe. Then, the electric push rod 10 is extended to drive the pressing plate 34 to fix the composite pipe. When bending, first, the winch 5 pays out the traction rope 6, then the second telescopic rod 4 is shortened, so that the first mounting plate 7 leaves the first sealing member 8, and then the bending operation is carried out. After completion, the electric push rod 10 is shortened to drive the pressing plate 34 to separate from the composite pipe. Under the air pressure in the composite pipe, the first sealing member 8 separates from the composite pipe. Then, the winch 5 winds up the traction rope 6, and the traction rope 6 pulls the first sealing member 8 back to its original position to prepare for the next bending operation.

[0038] In this embodiment, the inflation assembly includes: A cylinder block 25 fixed on the frame 1 and located on one side of the driving gear 31, which can be fixed by screws; A first piston 26 and a second piston 28 arranged in the cylinder block 25. A compression spring 27 is fixedly connected between the first piston 26 and the second piston 28. The second piston 28 is located at one end of the cylinder block 25 close to the driving gear 31; A threaded pipe 29 fixed on the second piston 28. The threaded pipe 29 penetrates through one end of the cylinder block 25 and extends to the outside thereof. An external threaded rod 30 is threadedly connected in the threaded pipe 29. The external threaded rod 30 is rotatably connected to the frame 1. The external threaded rod 30 is driven and connected to the driving gear 31 through a bevel gear pair 33; An air pipe 21 connected to the other end of the cylinder block 25, which is a flexible pipe. The other end of the air pipe 21 is communicated with the inner cavity of the positioning frustum 9 of the second sealing member 17. Air holes are provided at the head of the positioning frustum 9.

[0039] When the driving gear 31 drives the turntable 11 to rotate, the external threaded rod 30 is driven to rotate through the bevel gear pair 33. The external spiral rod drives the first piston 26 to gradually move through the threaded pipe 29. The first piston 26 drives the second piston 28 to gradually move through the compression spring 27. The second piston 28 gradually presses the air in the cylinder block 25 into the composite pipe through the air pipe 21. Along with the gradual increase of the bending angle, at the same time, the air pressure in the composite pipe gradually increases, and the protection effect is better.

[0040] In a specific implementation, two guide rollers 22 are provided between the second sealing member 17 and the support roller 32. The two guide rollers 22 are arranged vertically. The composite pipe is located between the two guide rollers 22, which can support and position the composite pipe. The top of the lower guide roller 22 and the top of the support roller 32 are on the same horizontal line. The lower guide roller 22 is rotatably installed at the top end of a support rod, and the support rod is fixed to the frame 1. The upper guide roller 22 is rotatably installed at the telescopic end of the third telescopic rod 16, and the third telescopic rod 16 is vertically fixed to the second side plate 18.

[0041] In summary, the present invention provides a prefabrication device for processing and bending composite pipes, and its working principle is as follows: Place the composite pipe on the support roller 32. By extending the second telescopic rod 4 and the fourth telescopic rod 20, the positioning round tables 9 of the first sealing member 8 and the second sealing member 17 enter both ends of the composite pipe to seal the composite pipe. Then, the electric push rod 10 extends to drive the pressing plate 34 to fix the composite pipe. When bending, first let the winch 5 pay out the traction rope 6, then shorten the second telescopic rod 4 to make the first mounting plate 7 leave the first sealing member 8. Then start the stepping motor. The stepping motor drives the driving gear 31, and the driving gear 31 drives the turntable 11 to rotate through the gear ring. The turntable 11 drives the mounting block 12 to rotate, and the mounting block 12 drives the bending plate 15 to move along the length direction of the composite pipe to partially heat the composite pipe until the mounting block 12 slides to the end of the stroke. Then the bending plate 15 presses down on the composite pipe to bend the composite pipe. At the same time, the driving gear 31 drives the external threaded rod 30 to rotate through the bevel gear pair 33. The external screw rod drives the first piston 26 to gradually move through the threaded pipe 29. The first piston 26 drives the second piston 28 to gradually move through the compression spring 27. The second piston 28 gradually presses the air in the cylinder body 25 into the composite pipe through the air pipe 21. The air pressure in the composite pipe gradually increases, supporting the inner wall, reducing the collapse or cross-section deformation of the pipe material, and improving the bending quality.

[0042] It should be noted that for the foregoing embodiments, for the sake of simple description, they are all expressed as a series of action combinations. However, those skilled in the art should know that the present invention is not limited by the described action sequence, because according to the present invention, certain steps may be carried out in other sequences or simultaneously. Secondly, those skilled in the art should also know that the embodiments described in the specification are all preferred embodiments, and the actions and modules involved are not necessarily essential to the present invention.

[0043] In the embodiments provided by the present application, it should be understood that the disclosed device can be implemented in other ways. For example, the device embodiments described above are merely illustrative. For example, the above division of units is only a logical function division. In actual implementation, there may be other division methods. For example, multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the displayed or discussed coupling or communication connection between each other can be through some interfaces. The indirect coupling or communication connection between devices or units can be in the form of telecommunications or other forms.

[0044] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than limiting the protection scope of the invention. Obviously, the described embodiments are only some embodiments of the present invention, rather than all embodiments. Based on these embodiments, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present invention. Although the present invention has been described in detail with reference to the above embodiments, those of ordinary skill in the art can still, without conflict and without creative efforts, combine, add, delete or make other adjustments to the features in the various embodiments of the present invention according to the circumstances, so as to obtain different technical solutions that essentially do not deviate from the concept of the present invention. These technical solutions also belong to the scope of protection of the present invention.

Claims

1. A composite pipe processing, bending and prefabrication device, characterized in that: include: A support roller for supporting the composite pipe; A bending assembly, used for pressing down the pipe section between one end of the composite pipe and the support roller to bend it; The first closing member and the second closing member are respectively located at both ends of the composite pipe, and are used to close the pipe openings at both ends of the composite pipe. When bending, the first closing member can be fixedly connected to one end of the composite pipe and move with the one end of the composite pipe; The inflatable component is used to inflate air into the composite tube during bending to increase the air pressure inside the composite tube.

2. The composite pipe processing, bending and prefabrication device according to claim 1, characterized in that: The bending assembly comprises: a bending plate located on the upper side of the composite tube; A driving mechanism for driving the bending plate to press down the composite pipe.

3. The composite pipe processing, bending and prefabrication device according to claim 2, characterized in that: The bending plate and the supporting roller are respectively provided with electric heating elements for heating the composite pipe.

4. The composite pipe processing, bending and prefabrication device according to claim 3, characterized in that: The driving mechanism comprises: A turntable is rotatably mounted on the frame, the turntable is located at the rear side of the composite pipe, the support roller is coaxially rotatably mounted on the turntable, and a power member for driving the turntable to rotate is mounted on the frame; A mounting block is slidably mounted on the disk surface of the rotating disk along the radial direction of the rotating disk, and the middle part of the bending plate is hingedly mounted on the mounting block.

5. The composite pipe processing, bending and prefabrication device according to claim 4, characterized in that: The power member comprises: A stepper motor fixed on the frame; A driving gear is fixed on the output shaft of the stepping motor, and a gear ring meshing with the driving gear is provided on the circumferential wall of the rotating disk.

6. The composite pipe processing, bending and prefabrication device according to claim 1, characterized in that: The first closing member is mounted on a first side frame, and the first side frame comprises: A first telescopic rod vertically fixed on the frame, wherein a first side plate is fixed on the first telescopic rod; A second telescopic rod is horizontally fixed to the first side panel, a first mounting plate is fixed to the telescopic end of the second telescopic rod, the first closing piece is located on a side of the first mounting plate close to the support roller, a winch is fixedly installed on the other side of the first mounting plate, a traction rope is wound around the winch, and the traction rope passes through the through hole on the first mounting plate and is connected to the first closing piece.

7. The composite pipe processing, bending and prefabrication device according to claim 6, characterized in that: The second closing member is mounted on a second side frame, and the second side frame comprises: a fifth telescopic rod vertically fixed on the frame, wherein a second side plate is fixed on the fifth telescopic rod; A fourth telescopic rod is horizontally fixed on the second side plate, a second mounting plate is fixed to the telescopic end of the fourth telescopic rod, and the second closing member is fixed to the side wall of the second mounting plate close to the supporting roller.

8. The composite pipe processing, bending and prefabrication device according to claim 7, characterized in that: The first closure member and the second closure member have the same structure, and both include: The installation cylinder has an opening at one end close to the support roller. A positioning truncated cone coaxially arranged in the installation cylinder and connected to the end wall thereof is used for inserting into the composite tube for positioning, and a sealing sleeve is sleeved on the surface of the positioning truncated cone; A plurality of electric push rods are fixed on the mounting tube at intervals in an annular direction and along the radial direction of the mounting tube, a pressing plate is fixed at one end of the electric push rod close to the positioning truncated table for pressing and fixing the composite pipe, and a rubber pad is provided on the surface of the pressing plate close to the positioning truncated table; The traction rope is connected to the center of the end wall of the first closure member.

9. The composite pipe processing, bending and prefabrication device according to claim 8, characterized in that: The inflatable component comprises: A cylinder body fixed on the frame and located on one side of the driving gear; A first piston and a second piston are disposed in the cylinder body, a compression spring is fixedly connected between the first piston and the second piston, and the second piston is located at one end of the cylinder body close to the driving gear; A threaded tube fixed on the second piston, the threaded tube passes through one end of the cylinder body and extends to the outside thereof, the threaded tube is internally threadedly connected to an externally threaded rod, the externally threaded rod is rotatably connected to the frame, and the externally threaded rod is drivingly connected to the driving gear through a bevel gear pair; An air pipe is connected to the other end of the cylinder body, the other end of the air pipe is communicated with the inner cavity of the positioning truncated cone of the second closing member, and an air hole is arranged at the head of the positioning truncated cone.

10. The prefabrication method of the composite pipe processing and bending prefabrication device according to claim 8, characterized in that: The steps include: Place the composite tube on the support rollers; The pipe openings at both ends of the composite pipe are closed by a first closing piece and a second closing piece; Start the bending assembly to press down the pipe section between one end of the composite pipe and the support roller to bend it; At the same time, the inflation component is used to inflate air into the composite pipe to increase the air pressure in the composite pipe.

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