Composite thermal insulation pipe welding equipment

Abstract

The utility model relates to composite thermal insulation pipe welding equipment, and relates to the technical field of welding, the composite thermal insulation pipe welding equipment comprises a machine tool main body, an adjusting mechanism is arranged in the machine tool main body, the top of the adjusting mechanism is slidably connected with a sliding plate, the top of the sliding plate is provided with an inner supporting mechanism, and the inner supporting mechanism comprises a connecting plate; a pushing assembly is arranged at the top of the connecting plate, a protective shell is fixedly connected to the exterior of the pushing assembly, a second air cylinder is fixedly connected to the interior of the protective shell, a pushing column is fixedly connected to the driving end of the second air cylinder, and a rotating connecting rod is rotationally connected to the exterior of the pushing column; and the other end of the rotating connecting rod is rotationally connected with a fixing strip. The device is provided with a transmission structure that the second air cylinder is matched with the rotating connecting rod, axial thrust is efficiently converted into radial expansion force, the fixing strips are tightly attached to the inner wall of the pipe, the welding seam defect caused by pipe shaking is reduced, and the adaptability of the device to complex working conditions and multi-specification pipelines is enhanced.

Description

Technical Field

[0001] This application relates to the field of welding technology, and in particular to a welding device for composite insulation pipes. Background Technology

[0002] In today's rapidly developing energy transmission sector, composite insulated pipes, with their high-efficiency insulation, corrosion resistance, and durability, are widely used in municipal heating, petrochemical, and marine engineering applications. With the advancement of "dual-carbon" goals and the increasing demands for energy transmission efficiency, higher standards are being set for the welding quality and production efficiency of composite insulated pipes. High-performance welding equipment has become crucial for ensuring pipeline lifespan and transmission stability.

[0003] A search revealed Chinese patent publication number CN115430970A, which discloses a steam insulation pipe. The steam insulation pipe includes a coaxial inner pipe and an outer pipe, with insulation cotton filling the space between them. Each end of the outer pipe has two arc-shaped retaining strips. The middle section of each retaining strip is an arc segment coaxial with the inner pipe, and the two ends are straight segments tangent to the arc segment. The arc-shaped retaining strips are formed by bending the middle section of straight strips. The arc segments of the two retaining strips symmetrically hug the outer wall of the inner pipe. The ends of the two straight segments of each retaining strip are welded to the end face of the outer pipe. Because the arc-shaped retaining strips are not directly welded to the inner pipe, the expansion of the outer diameter of the inner pipe due to heating causes further elastic deformation of the arc-shaped rubber strips, which is not rigidly transmitted to the retaining strips. This prevents the welds at both ends of the retaining strips from cracking due to rigid tensile force, thereby enhancing the resistance to temperature differences between the inner and outer pipes.

[0004] The aforementioned patent specification mentions that "since the arc-shaped retaining strip is not directly welded to the inner tube, the expansion of the outer diameter of the inner tube due to heating will cause further elastic deformation of each arc-shaped rubber strip, instead of rigidly transmitting it to the arc-shaped retaining strip, thereby preventing the weld at both ends of the arc-shaped retaining strip from cracking due to rigid tension, and thus enhancing the resistance to temperature difference between the inner and outer tubes." The above content can solve the problem of cracks caused by deformation. However, it is prone to problems such as misalignment and porosity in the weld due to the unstable fixing of the inner and outer tubes during welding. Therefore, a composite insulation pipe welding device is proposed to solve the above problems. Utility Model Content

[0005] The purpose of this application is to provide a composite insulation pipe welding device, which aims to improve the welding stability of some welding devices.

[0006] The composite insulation pipe welding equipment provided in this application adopts the following technical solution:

[0007] A composite insulation pipe welding device includes a machine tool body. An adjustment mechanism is installed inside the machine tool body. A sliding plate is slidably connected to the top of the adjustment mechanism. An internal support mechanism is installed on the top of the sliding plate. A support slide is fixedly connected inside the machine tool body. A welding mechanism is installed outside the support slide. A clamping mechanism is installed inside the machine tool body. The internal support mechanism includes a connecting plate. The bottom of the connecting plate is fixedly connected to the top of the sliding plate. A pushing assembly is installed on the top of the connecting plate. A protective shell is fixedly connected to the outside of the pushing assembly. A second cylinder is fixedly connected inside the protective shell. A pushing column is fixedly connected to the driving end of the second cylinder. A rotating connecting rod is rotatably connected to the outside of the pushing column. A fixing strip is rotatably connected to the other end of the rotating connecting rod.

[0008] Through the above technical solution: the composite insulation pipe is placed on the clamping mechanism of the supporting outer frame to complete the concentric clamping of the pipe. Then, the sliding plate is moved by the adjustment mechanism to push the inner support mechanism into the pipe. Cylinder 1 pushes the protective shell to slide along the support column to adjust the vertical position of the inner support mechanism. Then, cylinder 2 drives the push column, and the axial force is converted into radial force through the rotating connecting rod, so that the fixing strip expands and fits the inner wall of the pipe. After positioning, welding is performed by welding mechanism 7 to achieve efficient welding of the inner ring and the outer pipe.

[0009] Preferably, the clamping mechanism includes a motor three, the motor three is externally fixedly connected to the inside of the machine tool body, the drive end of the motor three is fixedly connected to a housing two, and the housing two is externally fixedly connected to the motor two.

[0010] By adopting the above technical solution, after the pipe is placed on the machine tool body, the clamping mechanism starts to operate. Motor 3 is fixed inside the machine tool body, and its drive end drives the outer shell 2 to rotate, realizing the initial adjustment of the circumferential position of the pipe and ensuring that the weld is in the appropriate welding position. Meanwhile, Motor 2, which is fixed outside the outer shell 2, starts and drives the bevel gear to rotate. The bevel gear meshes with the face gear, so that the sliding fixing plate in the annular groove outside the face gear slides radially along the strip guide rail of the outer shell 2, thereby clamping the pipe from multiple directions at the same time and achieving concentric positioning.

[0011] Preferably, the pushing component includes a cylinder, a support column is fixedly connected to the outside of the connecting plate, a cylinder is fixedly connected to the inside of the support column, the driving end of the cylinder is fixedly connected to the outside of the protective shell, and the outside of the protective shell is slidably connected to the inside of the support column.

[0012] By adopting the above technical solution, the cylinder 1 in the drive component works in concert with the support column. The bottom outer side of the support column is fixed to the connecting plate to provide stable support for the mechanism. After the cylinder 1 fixed inside is started, its drive end pushes the protective shell to slide along the inside of the support column. At the same time, the cylinder 1 precisely adjusts the thrust according to the pipe specifications to make the protective shell rise and fall smoothly, driving the internal support component to adjust to a suitable height, ensuring that the fixing strip is aligned with the center of the inner wall of the pipe.

[0013] Preferably, a bevel gear is fixedly connected to the drive end of the second motor, and a face gear is rotatably connected inside the second housing, with the outer teeth of the face gear meshing with the outside of the bevel gear;

[0014] By adopting the above technical solution, when the composite insulation pipe is fixed, the bevel gear is driven to rotate at high speed by the second motor. Utilizing the gear meshing principle, the bevel gear transmits power to the face gear that is rotatably connected inside the second outer shell, so that the face gear rotates synchronously. During the rotation of the face gear, its external locking teeth drive the bevel gear that meshes with it, thereby driving the sliding fixing plate to slide radially along the strip guide rail of the second outer shell, so as to achieve tight clamping of the pipe.

[0015] Preferably, the face gear is provided with an annular groove on its outside, and a sliding fixing plate is slidably connected to the outside of the annular groove. The sliding fixing plate is slidably connected to the inside of the strip guide rail of the outer shell 2.

[0016] By adopting the above technical solution, when the second motor drives the bevel gear to rotate the face gear, the annular groove outside the face gear rotates accordingly. Since the sliding fixing plate is slidably connected to the annular groove, and its exterior is embedded in the strip guide rail of the second outer shell, the rotation of the annular groove will force the sliding fixing plate to slide radially along the strip guide rail. The face gear continues to rotate, and multiple sliding fixing plates move synchronously towards the pipe, tightly clamping and fixing the composite insulation pipe from different angles.

[0017] Preferably, the adjustment mechanism includes a housing, the outer side of which is fixedly connected to the inside of the machine tool body, and two limiting posts are rotatably connected inside the housing. A motor is fixedly connected inside the machine tool body.

[0018] By adopting the above technical solution, the motor drives the threaded rod inside the outer shell to rotate. Since the sliding ring is threadedly connected to the threaded rod and slides along the two limiting posts, the sliding ring can move smoothly axially along the limiting posts under the rotation of the threaded rod. The top of the sliding ring is connected to the sliding plate, which in turn drives the sliding plate and the inner support mechanism fixed on it to push the inner support mechanism to the welding position inside the composite insulation pipe.

[0019] Preferably, the drive end of the motor is fixedly connected to a threaded rod, the outer side of the threaded rod is rotatably connected to the inside of the housing, the outer side of the threaded rod is threadedly connected to a sliding ring, the inner side of the sliding ring is slidably connected to the outside of the limiting post, and the top of the sliding ring is fixedly connected to the bottom of the sliding plate.

[0020] By adopting the above technical solution, when the motor is started, its driving end drives the threaded rod to rotate inside the outer shell. Since the threaded rod is threadedly connected to the sliding ring, the rotation of the threaded rod is converted into the linear motion of the sliding ring. At the same time, the sliding ring slides along the limiting post to ensure the direction of movement. As the sliding ring moves, the sliding plate fixedly connected to its top also moves, thereby driving the inner support mechanism at the top of the sliding plate to be smoothly pushed to the welding position inside the composite insulation pipe.

[0021] Preferably, the welding mechanism includes a support plate, the support plate is slidably connected to the outside of the support slide bar, a connecting strip is fixedly connected to the outside of the support plate, a cylinder three is fixedly connected to the bottom of the connecting strip, a center wheel is fixedly connected to the driving end of the cylinder three, the center wheel is slidably connected to the inside of the connecting strip, a support block is slidably connected to the outside of the support plate, and a welding fixing head is slidably connected to the inside of the support block.

[0022] By adopting the above technical solution, during the welding of composite insulation pipes, the support plate of the welding mechanism slides along the support slide bar to quickly adjust to the welding position, ensuring that the welding fixing head is initially aligned with the pipe weld. Subsequently, the cylinder is activated, and its drive end pushes the center wheel to slide inside the connecting bar, causing the support block and the welding fixing head to descend synchronously until the welding fixing head approaches the pipe surface. During the welding process, the pipe rotates under the drive of the clamping mechanism, and the center wheel provides stable support for the welding fixing head through the support block, ensuring that it is in close contact with the pipe surface for welding. At the same time, the welding fixing head can slide along the inside of the support block, adaptively adjusting its position to conform to the circumferential contour of the pipe, improving welding quality and efficiency.

[0023] In summary, this application includes at least one of the following beneficial technical effects:

[0024] 1. Through the transmission structure of cylinder 2 and rotating connecting rod, the axial thrust is efficiently converted into radial expansion force, so that the fixing strip fits tightly against the inner wall of the pipe, avoiding displacement or collapse caused by thermal deformation and vibration during welding, reducing weld defects caused by pipe shaking, and enhancing the equipment's adaptability to complex working conditions and multi-specification pipes.

[0025] 2. The cylinder drives the center wheel to bring the welding head close to the pipe, and the motor drives the pipe to rotate, forming a welding mode in which the welding gun is fixed and the pipe rotates. This ensures that the weld between the inner and outer pipes is uniform and continuous, effectively avoiding welding dead corners and missed welds, and enhancing the equipment's adaptability to composite insulation pipes of different diameters and the reliability of welding. Attached Figure Description

[0026] Figure 1 This is a three-dimensional schematic diagram of a composite insulation pipe welding equipment proposed in this utility model;

[0027] Figure 2 This is a schematic diagram of the structure of the support column of the composite insulation pipe welding equipment proposed in this utility model;

[0028] Figure 3 for Figure 2 Enlarged view of point A in the middle;

[0029] Figure 4 This is a schematic diagram of the structure of the support plate of the composite insulation pipe welding equipment proposed in this utility model;

[0030] Figure 5 for Figure 4 Enlarged view of point B in the middle;

[0031] Figure 6 This is a schematic diagram of the structure of a support block for a composite insulation pipe welding equipment proposed in this utility model;

[0032] Figure 7 for Figure 6 Enlarged view of point C in the middle;

[0033] Explanation of reference numerals in the attached drawings: 1. Support frame; 2. Adjustment mechanism; 21. Outer shell 1; 22. Limiting post; 23. Motor 1; 24. Sliding ring; 25. Threaded rod; 3. Sliding plate; 4. Internal support mechanism; 41. Connecting plate; 42. Pushing assembly; 421. Cylinder 1; 422. Supporting post; 43. Protective shell; 44. Cylinder 2; 45. Fixing strip; 46. Rotating connecting rod; 47. Pushing post; 5. Supporting slide bar; 6. Clamping mechanism; 61. Motor 2; 62. Outer shell 2; 63. Bevel gear; 64. Motor 3; 65. Face gear; 66. Sliding fixing plate; 7. Welding mechanism; 71. Support plate; 72. Connecting strip; 73. Center wheel; 74. Cylinder 3; 75. Support block; 76. Welding fixing head. Detailed Implementation

[0034] The following is in conjunction with the appendix Figure 1 -Appendix Figure 7 This application will be described in further detail below.

[0035] Example: A composite insulation pipe welding device, referring to... Figures 1 to 3The system includes a machine tool body 1, which bears the mechanical stress and vibration during the welding process. An adjustment mechanism 2 is provided inside the machine tool body 1. A sliding plate 3 is slidably connected to the top of the adjustment mechanism 2. The sliding plate 3 is used to move smoothly along the axial direction under the drive of the adjustment mechanism 2. An inner support mechanism 4 is provided on the top of the sliding plate 3. The inner support mechanism 4 is used to fix the inner tube and prevent the tube from collapsing due to thermal deformation or external force during welding. A support slide bar 5 is fixedly connected inside the machine tool body 1. The support slide bar 5 is used to provide a stable transverse sliding track for the welding mechanism 7. The welding mechanism 7 is provided outside the support slide bar 5. The welding mechanism 7 is used to perform the welding operation of the composite insulation pipe. A clamping mechanism 6 is provided inside the machine tool body 1. The clamping mechanism 6 is used to fix the outside of the composite insulation pipe.

[0036] The internal support mechanism 4 includes a connecting plate 41, which transmits the driving force of the adjusting mechanism 2 to ensure the overall stability of the internal support mechanism 4. The bottom of the connecting plate 41 is fixedly connected to the top of the sliding plate 3. A pushing component 42 is provided on the top of the connecting plate 41, which is used to adjust the vertical height of the internal support mechanism 4. A protective shell 43 is fixedly connected to the outside of the pushing component 42 to protect the interior. A second cylinder 44 is fixedly connected inside the protective shell 43 to push the column 47 to move, thereby achieving fixation. The radial expansion and contraction of the strip 45, the drive end of the cylinder 44 is fixedly connected to the push column 47, the push column 47 is used to transmit the axial force of the cylinder 44 to the rotating connecting rod 46, the outside of the push column 47 is rotatably connected to the rotating connecting rod 46, the rotating connecting rod 46 is used to convert the axial movement of the push column 47 into the radial movement of the fixed strip 45, so as to realize the internal support and fixation of the pipe. The other end of the rotating connecting rod 46 is rotatably connected to the fixed strip 45, the fixed strip 45 is used to directly contact the inner wall of the pipe, and provide stable support through the pressure generated by expansion;

[0037] The pushing component 42 includes a cylinder 421, which is used to adjust the position of the protective shell 43. A support column 422 is fixedly connected to the outside of the connecting plate 41, and a cylinder 421 is fixedly connected to the inside of the support column 422. The driving end of the cylinder 421 is fixedly connected to the outside of the protective shell 43, and the outside of the protective shell 43 is slidably connected to the inside of the support column 422.

[0038] Specifically, when the composite insulation pipe welding equipment is working, the pipe is placed on the machine tool body 1. The clamping mechanism 6 is driven by the bevel gear 63 and the face gear 65 through the second motor 61, which drives the sliding fixing plate 66 to radially slide and clamp the outside of the pipe. At the same time, the first motor 23 of the adjusting mechanism 2 drives the threaded rod 25 to rotate, so that the sliding ring 24 slides along the limiting post 22, which drives the sliding plate 3 to push the inner support mechanism 4 into the inside of the pipe. The first cylinder 421 of the pushing component 42 adjusts the height of the protective shell 43, and the second cylinder 44 drives the pushing post 47 to expand the fixing bar 45 through the rotating connecting rod 46, thus stabilizing the pipe from the inside. Subsequently, the support plate 71 of the welding mechanism 7 moves and positions itself along the support slide bar 5, and the third cylinder 74 drives the center wheel 73 to move the welding fixing head 76 close to the pipe, completing the welding operation.

[0039] Reference Figure 1 , Figure 4 and Figure 5 The clamping mechanism 6 includes a motor 3 64, which drives the rotation of the outer shell 2 62 to adjust the circumferential position of the tube. The motor 3 64 is externally fixedly connected to the inside of the machine tool body 1. The drive end of the motor 3 64 is fixedly connected to the outer shell 2 62. The outer shell 2 62 is externally fixedly connected to the motor 2 61, which drives the bevel gear 63 to rotate and realizes the radial movement of the sliding fixed plate 66 through gear transmission.

[0040] A bevel gear 63 is fixedly connected to the drive end of motor 2 61. The bevel gear 63 is used to transmit the rotational motion of motor 2 61 to face gear 65. The face gear 65 is rotatably connected inside the outer shell 2 62. The outer teeth of face gear 65 are meshed with the outer side of bevel gear 63. Face gear 65 is used to mesh with bevel gear 63 to convert the rotational motion into the linear motion of sliding fixed plate 66. The outer side of face gear 65 is provided with an annular groove. The outer side of the annular groove is slidably connected to sliding fixed plate 66. Sliding fixed plate 66 is used to slide radially along the strip guide rail of outer shell 2 62 under the drive of face gear 65, directly acting on the outside of the pipe to achieve clamping and fixing of the pipe. The outer side of sliding fixed plate 66 is slidably connected to the inside of strip guide rail of outer shell 2 62.

[0041] Specifically, during the welding process of the composite insulation pipe, the clamping mechanism 6 drives the outer shell 62 to rotate via motor 64, achieving precise adjustment of the circumferential position of the pipe and ensuring that the weld is in the optimal welding position. Subsequently, motor 61 starts, driving the bevel gear 63 to rotate. The bevel gear 63 meshes with the face gear 65, converting the rotational motion into the rotation of the face gear 65. The annular groove on the outside of the face gear 65 drives the sliding fixing plate 66 to slide radially along the strip guide rail of the outer shell 62, simultaneously clamping the pipe from multiple directions to achieve external fixation.

[0042] Reference Figure 1 , Figure 6 and Figure 7The adjusting mechanism 2 includes a housing 21, which is fixed inside the machine tool body and provides installation space and protection for the threaded rod 25 and the limiting posts 22. The outer side of the housing 21 is fixedly connected to the inside of the machine tool body 1. Two limiting posts 22 are rotatably connected inside the housing 21. The limiting posts 22 are used to guide the movement of the sliding ring 24, limit its movement trajectory, and prevent deviation or shaking during sliding. A motor 23 is fixedly connected inside the machine tool body 1. The motor 23 is the power source of the adjusting mechanism 2. By driving the threaded rod 25 to rotate, it converts the rotational motion into the linear motion of the sliding ring 24. The drive end of the motor 23 is fixedly connected to a threaded rod 25. The external part of the threaded rod 25 is rotatably connected to the inside of the outer casing 21. The threaded rod 25 is used to rotate under the drive of the motor 23, and drives the sliding ring 24 to move axially through the threaded transmission. The external thread of the threaded rod 25 is connected to the sliding ring 24, which is used to cooperate with the threaded rod 25. Under the action of the threaded transmission, it slides along the limiting post 22, thereby driving the sliding plate 3 and the inner support mechanism 4 to move, so as to realize the position adjustment. The internal sliding connection of the sliding ring 24 is slidably connected to the outside of the limiting post 22, and the top of the sliding ring 24 is fixedly connected to the bottom of the sliding plate 3.

[0043] The welding mechanism 7 includes a support plate 71, which slides along a support slide bar 5 to adjust the lateral position of the welding fixing head 76. The support plate 71 is externally slidably connected to the outside of the support slide bar 5. A connecting bar 72 is fixedly connected to the outside of the support plate 71. The connecting bar 72 is used to connect the support plate 71 and the cylinder 3 74 to transmit the driving force of the cylinder. The bottom of the connecting bar 72 is fixedly connected to the cylinder 3 74. A center wheel 73 is fixedly connected to the driving end of the cylinder 3 74. The outside of the center wheel 73 is slidably connected to the inside of the connecting bar 72. A support block 75 is slidably connected to the outside of the support plate 71. The welding fixing head 76 is slidably connected to the inside of the support block 75. The welding fixing head 76 is used to install the welding gun and directly perform welding operations. Through sliding cooperation with the support block 75, the welding position can be finely adjusted and self-adapted to ensure the quality of the weld.

[0044] Specifically, during the welding process of the composite insulation pipe, the adjusting mechanism 2 and the welding mechanism 7 work together. The motor 23 of the adjusting mechanism 2 drives the threaded rod 25 to rotate, causing the sliding ring 24 to slide linearly along the limiting post 22, which in turn moves the sliding plate 3 and the inner support mechanism 4 axially to the position to be welded. The outer shell 21 provides stable support and protection for the transmission components. During welding, the support plate 71 slides along the support slide bar 5 for positioning, and the cylinder 74 drives the center wheel 73 to raise and lower the support block 75 and the welding fixing head 76. The welding fixing head 76 is equipped with a welding torch and its position is finely adjusted through sliding cooperation with the support block 75 to adapt to changes in the pipe profile.

[0045] The implementation principle of this application embodiment is as follows: The composite insulation pipe is placed on the clamping mechanism 6 of the supporting outer frame 1. The bevel gear 63 is driven to rotate by the motor 2 61. The bevel gear 63 meshes with the face gear 65. The face gear 65 drives the sliding fixing plate 66 to slide radially along the strip guide rail of the outer shell 2 62 through the annular groove, thereby achieving concentric clamping of the pipe. The threaded rod 25 is driven to rotate by the motor 1 23, which drives the sliding ring 24 to slide along the limiting post 22, thereby driving the sliding plate 3 to slide on the outer shell 1 21, pushing the inner support mechanism 4 to the welding position inside the pipe. At the same time, the protective shell 43 is pushed to slide along the support post 422 supported by the connecting plate 41 by the cylinder 1 421, adjusting the inner support mechanism. Position 4: Fix the inner tube in a suitable welding position. At this time, the cylinder 44 drives the column 47 to move axially. The axial force is converted into radial force by rotating the connecting rod 46, which pushes the fixing strip 45 to expand outward and fix the position of the inner tube. The support plate 71 slides along the support slide bar 5. The cylinder pushes to achieve positioning, so that the welding fixing head 76 is aligned with the weld. The cylinder 74 drives the center wheel 73 to descend, which drives the support block 75 and the welding fixing head 76 to approach the welding position. At this time, the motor 64 drives the outer shell 62 to rotate, which drives the pipe to rotate and cooperate. The cylinder 74 pushes the connecting strip 72 to the appropriate position, assists the pipe to rotate, and cooperates with the welding fixing head 76 to weld the inner ring and the outer tube.

[0046] The embodiments described in this specific implementation are preferred embodiments of this application and are not intended to limit the scope of protection of this application. Identical components are represented by the same reference numerals. Therefore, all equivalent changes made to the structure, shape, and principle of this application should be included within the scope of protection of this application.

Claims

1. A composite insulating pipe welding apparatus comprising a machine tool main body (1), characterized in that, The machine tool body (1) is provided with an adjustment mechanism (2) inside. A sliding plate (3) is slidably connected to the top of the adjustment mechanism (2). An internal support mechanism (4) is provided on the top of the sliding plate (3). A support slide (5) is fixedly connected inside the machine tool body (1). A welding mechanism (7) is provided on the outside of the support slide (5). A clamping mechanism (6) is provided inside the machine tool body (1). The inner support mechanism (4) includes a connecting plate (41), the bottom of which is fixedly connected to the top of the sliding plate (3). A pushing component (42) is provided on the top of the connecting plate (41). A protective shell (43) is fixedly connected to the outside of the pushing component (42). A cylinder (44) is fixedly connected inside the protective shell (43). A pushing column (47) is fixedly connected to the driving end of the cylinder (44). A rotating connecting rod (46) is rotatably connected to the outside of the pushing column (47). A fixing strip (45) is rotatably connected to the other end of the rotating connecting rod (46).

2. The composite pipe welding apparatus according to claim 1, wherein The clamping mechanism (6) includes a third motor (64), which is externally fixedly connected to the inside of the machine tool body (1). The drive end of the third motor (64) is fixedly connected to a second outer shell (62), and the second outer shell (62) is externally fixedly connected to a second motor (61).

3. The composite pipe welding apparatus of claim 1, wherein, The pushing assembly (42) includes a cylinder (421), a support column (422) is fixedly connected to the outside of the connecting plate (41), a cylinder (421) is fixedly connected to the inside of the support column (422), the driving end of the cylinder (421) is fixedly connected to the outside of the protective shell (43), and the outside of the protective shell (43) is slidably connected to the inside of the support column (422).

4. The composite pipe welding apparatus of claim 2, wherein, The drive end of the second motor (61) is fixedly connected to a bevel gear (63), and the inside of the second outer casing (62) is rotatably connected to a face gear (65). The outer teeth of the face gear (65) are engaged with the outside of the bevel gear (63).

5. A composite pipe welding apparatus according to claim 4, wherein The face gear (65) has an annular groove on its outside, and a sliding fixing plate (66) is slidably connected to the outside of the annular groove. The sliding fixing plate (66) is slidably connected to the inside of the strip guide rail of the outer shell (62).

6. The composite pipe welding apparatus of claim 1, wherein, The adjustment mechanism (2) includes a housing (21), which is fixedly connected to the outside of the machine tool body (1). Two limiting posts (22) are rotatably connected inside the housing (21), and a motor (23) is fixedly connected inside the machine tool body (1).

7. A composite insulating pipe welding apparatus according to claim 6, wherein The drive end of the motor (23) is fixedly connected to a threaded rod (25). The outside of the threaded rod (25) is rotatably connected to the inside of the outer shell (21). The outside of the threaded rod (25) is threadedly connected to a sliding ring (24). The inside of the sliding ring (24) is slidably connected to the outside of the limiting post (22). The top of the sliding ring (24) is fixedly connected to the bottom of the sliding plate (3).

8. The composite pipe welding apparatus of claim 1, wherein, The welding mechanism (7) includes a support plate (71), the outside of which is slidably connected to the outside of the support slide bar (5), a connecting bar (72) is fixedly connected to the outside of the support plate (71), a cylinder three (74) is fixedly connected to the bottom of the connecting bar (72), a center wheel (73) is fixedly connected to the drive end of the cylinder three (74), the outside of which is slidably connected to the inside of the connecting bar (72), a support block (75) is slidably connected to the outside of the support plate (71), and a welding fixing head (76) is slidably connected to the inside of the support block (75).

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