Plastic pipe welding equipment

Abstract

The present invention provides a plastic pipe welding device, which belongs to the field of pipe welding technology. It solves the problem of poor convenience in welding processing operation of existing welding equipment. The plastic pipe welding device includes a frame, a fixed seat for positioning the head is fixed on the frame, a movable seat for longitudinally positioning the pipe and making the pipe and the head axially opposite is connected to the frame along the longitudinal sliding direction, a positioning frame located between the fixed seat and the movable seat and capable of heating the head and the pipe is detachably connected to the frame, the positioning frame can slide longitudinally, and a linkage structure is provided between the movable seat and the positioning frame. When the movable seat moves a set distance relative to the positioning frame in a direction away from the positioning frame, the positioning frame can be driven to slide synchronously through the linkage structure. The plastic pipe welding device ensures that there will be no inadequate movement or excessive movement during heating and welding, further improving the accuracy of heating and welding.

Description

Technical Field

[0001] The invention belongs to the technical field of pipeline welding and relates to welding equipment for plastic pipelines. Background Art

[0002] As people use more and more plastic pipes, and plastic pipes need to be used in various places, some plastic pipes need to be welded with caps at the ends. Existing plastic pipe welding machines usually heat the ends of the plastic pipes first, then heat the caps, and then use the driving parts to push the end of the caps to be sleeved on the end of the plastic pipe. However, this processing method lacks consistency, resulting in low plastic pipe welding efficiency.

[0003] In response to the above-mentioned problems, people have developed various plastic pipe welding equipment: for example, the Chinese patent application [authorization announcement number: CN215151956U] discloses a butt welding device for joints and pipes, comprising a base plate, a vertically arranged first axial support plate is installed on the base plate, a heating plate is installed on the first axial support plate through a heating plate driving device, a pipe feeding device is installed on the base plate on one side of the first axial support plate, and a polyethylene joint feeding device is installed on the other side of the first axial support plate. The pipe feeding device can clamp the pipe, and the polyethylene joint feeding device can clamp the joint. The heating plate can be moved to a position between the pipe feeding device and the polyethylene joint feeding device, and both the pipe feeding device and the polyethylene joint feeding device can move toward or away from the heating plate.

[0004] Although the above structure can be achieved by directly moving the heating plate between the pipe feeding device and the polyethylene joint feeding device, and then by synchronously moving the pipe feeding device and the polyethylene joint feeding device toward the heating plate, so that both the pipe and the polyethylene joint can be heated by the heating plate, and then the heating plate is removed and the joint is sleeved on the pipe, a driving part is required to control the synchronous movement of the pipe feeding device and the polyethylene joint feeding device, and the travel distance needs to be controlled. If deviation occurs, it may cause problems such as incorrect assembly position, making the welding process more difficult and reducing the convenience of operation for the processing personnel. Summary of the Invention

[0005] The purpose of the present invention is to address the above-mentioned problems in the existing technology and propose a plastic pipe welding device. The technical problem to be solved by the present invention is: how to improve the convenience of welding processing operation of the existing welding equipment.

[0006] The purpose of the present invention can be achieved through the following technical solutions:

[0007] A plastic pipe welding device includes a frame, on which a fixed seat for positioning a head is fixed, and is characterized in that a movable seat is connected to the frame for longitudinal sliding movement, and is used to position the pipe longitudinally and make the pipe and the head axially opposite to each other. The frame is detachably connected to a positioning frame located between the fixed seat and the movable seat and capable of heating the head and the pipe. The positioning frame can slide longitudinally, and a linkage structure is provided between the movable seat and the positioning frame. When the movable seat moves a set distance relative to the positioning frame in a direction away from the positioning frame, the positioning frame can be driven to slide synchronously through the linkage structure.

[0008] Working principle: Position the pipe on the moving seat and position the head on the fixed seat. At this time, the positioning frame is located between the fixed seat and the moving seat, and the moving seat is pushed to move toward the positioning frame. When the pipe of the moving seat is against the positioning frame, the moving seat pushes the positioning frame to move synchronously toward the fixed seat, so that one side of the positioning frame is against the head on the fixed seat. The positioning frame is positioned by the head. At this time, the moving seat cannot drive the positioning frame to continue moving. After heating the pipe and the head through the positioning frame, the moving seat is moved in the opposite direction. The pipe on the moving seat is separated from the positioning frame, and the moving seat is continued to move. When the moving seat moves to the set distance, the moving seat is connected through the linkage The structure drives the positioning frame to move synchronously, and moves until the positioning frame is separated from the head on the fixed seat, and then the positioning frame is removed from the frame body, and then the movable seat is pushed toward the fixed seat to weld the pipe and the head, thereby realizing the welding of the pipe and the head. In this welding process, the welding of the pipe and the head can be achieved only by moving the movable seat back and forth, and the fixed seat can be directly positioned, which makes the overall welding equipment more convenient; and since only the movable seat is moved, it is guaranteed that there will be no inadequate movement or excessive movement during heating and welding, further improving the accuracy of heating and welding.

[0009] In the above-mentioned plastic pipe welding equipment, the linkage structure includes two connecting plates respectively arranged on the left and right sides of the movable seat and the positioning frame. The side wall of the movable seat is connected to the corresponding connecting plate by a connecting piece in a longitudinal sliding manner. The side wall of the positioning frame is fixed to the corresponding connecting plate by a positioning piece. When the connecting piece slides until it abuts against the connecting plate in the longitudinal direction, the movable seat and the positioning frame slide synchronously.

[0010] By setting the length of the corresponding connecting plate, the movable seat drives the positioning frame to move through the connecting plate, and since the connecting piece and the connecting plate can move relative to each other, the movable seat can move a set distance relative to the positioning frame, and after moving into position, it drives the positioning frame to slide synchronously. The setting of the connecting plate can also guide the direction of movement of the movable seat, thereby simplifying the convenience of pipeline and head welding processing while ensuring the stability of the welding equipment.

[0011] In the above-mentioned plastic pipe welding equipment, the connecting plates are all provided with adjusting grooves along the sliding direction of the movable seat, and the connecting parts include a connecting screw fixed on the movable seat and embedded in the adjusting groove and a connecting nut threadedly connected to the connecting screw. The connecting screw can slide longitudinally until it abuts against the groove wall at the end of the adjusting groove and is limited.

[0012] By using the connecting nut and the connecting screw in combination, the welding of pipes and heads of different sizes can be done by replacing connecting plates of different sizes, which improves the applicability of the welding equipment and facilitates the installation of the connecting plate, making the connection between the connecting plate and the movable seat more convenient and quick.

[0013] The connecting screw rod abuts against the groove wall at the end of the adjusting slide groove to achieve the limitation of the movable seat. The limitation of the movable seat is more convenient and quick, and the convenience of welding of the welding equipment is further improved.

[0014] In the above-mentioned plastic pipe welding equipment, the side wall of the fixing seat is connected to the corresponding connecting plate by a fixing piece in a longitudinal sliding manner, the positioning piece is located between the connecting piece and the fixing piece, and the fixing piece is inserted into the adjusting groove and can slide along the adjusting groove.

[0015] By setting the fixing parts, the position between the positioning frame and the fixed seat can be adjusted by moving the movable seat, thereby realizing that the positioning frame heats the head on the fixed seat, and separates the positioning frame from the head on the fixed seat after heating, and the positioning parts are used to prevent the connecting parts and the fixing parts from affecting each other. By setting the fixing parts, the distance after the positioning frame and the fixed seat are separated can be limited, thereby avoiding excessive movement of the movable seat and realizing the convenience of welding heating.

[0016] In the above-mentioned plastic pipe welding equipment, the frame body includes a fixed plate arranged longitudinally opposite to the fixed seat, and the fixed seat and the fixed plate are connected by a plurality of parallel sliding rods, two of which are located on the left and right sides of the fixed seat, and the movable seat is slidably connected to two of the sliding rods. The positioning frame includes two sliders respectively placed on two of the sliding rods, and the positioning piece is a positioning block fixedly connected to the connecting plate, and one end of the positioning block is provided with a slot with an opening, and one end of the positioning block can be swung until the slider is partially embedded in the slot, and the slider is in longitudinal abutment against the slot wall.

[0017] By setting the slide rod, the positioning frame and the movable frame in the welding equipment can both move along the slide rod and can be guided by the slide rod, and the slider on the positioning frame can be directly placed on two of the slide rods respectively. At this time, the positioning frame is placed on the slide rod through the slider. When the positioning frame needs to move along the slide rod, one end of the positioning block is swung until the slider is partially located in the slot, and the slider abuts against the slot wall in the longitudinal direction, thereby realizing the connection between the positioning frame and the connecting plate. To take out the positioning frame, one end of the positioning block can be directly swung to separate the positioning block from the slider, and then the entire positioning frame can be taken out from the frame body, making it easy to take and place the positioning frame, and also convenient for connecting the positioning frame with the connecting plate, further improving the convenience of using the welding equipment.

[0018] In the above-mentioned plastic pipe welding equipment, the fixing member includes a fixing screw fixed on the fixing seat and embedded in the adjusting slot, and a fixing nut threadedly connected to the fixing screw.

[0019] The setting of the fixing screw and the fixing nut makes it easy to disassemble and assemble the fixing seat and the connecting plate. For the welding of pipes and heads of different sizes, it is only necessary to replace the connecting plates of different sizes, thereby improving the applicability of the welding equipment.

[0020] In the above-mentioned plastic pipe welding equipment, the movable seat includes two limit plates arranged longitudinally opposite each other and a driving member arranged between the two limit plates and connected to the two limit plates. The limit plates are provided with limit grooves for placing the pipes. The limit plates are all mounted on the sliding rod, and the driving member can drive the two limit plates to slide synchronously along the sliding rod.

[0021] Since the pipeline is long, two limit plates are used to support the pipeline at two points. The two limit plates are connected by a driving member, which can drive the two limit rods mounted on the sliding rods to slide synchronously, further improving the stability of the mobile seat in positioning the pipeline.

[0022] The driving member is an oil cylinder or an air cylinder, and the driving member can also be sleeved on the slide rod. In this case, the driving member and the limit plate can slide synchronously along the slide rod.

[0023] A plurality of support rods are provided between the two limiting plates, and the plurality of support rods are distributed circumferentially along the outer side of the guide sleeve.

[0024] The support rod improves the stability of the connection between the two limit plates.

[0025] In the above-mentioned plastic pipe welding equipment, the ends of both ends of the limiting plate are hinged with limiting rods that can press the pipe into the limiting groove, and the limiting sleeve is threadedly connected to the limiting rod.

[0026] The position of the limiting sleeve on the limiting rod can be rotatably adjusted so that the limiting sleeve can limit pipes of different sizes, further preventing the pipe from circumferentially moving in the moving seat when the moving seat moves, thereby improving the stability of the welding equipment.

[0027] In the above-mentioned plastic pipe welding equipment, the fixing seat includes a positioning plate, which is provided with a positioning groove for placing the head. The ends of both ends of the positioning plate are hinged with positioning rods that can press the head into the positioning groove, and the positioning rods are threaded with a positioning sleeve.

[0028] The head can be placed in the positioning groove. For heads of different sizes, the position of the positioning sleeve can be adjusted to limit the heads of different sizes, thereby preventing the heads from circumferentially moving in the fixed seat and improving the stability of the welding equipment.

[0029] In the above-mentioned plastic pipe welding device, the sliding rod located on one side of the fixing seat is higher than the sliding rod located on the other side of the fixing seat.

[0030] The arrangement of this structure enables the positioning rod and the limiting rod to position the head and the pipeline more stably, further ensuring the stability of the positioning of the pipeline and the head.

[0031] The positioning frame includes a heating plate that can heat the pipe and the head at the same time. Both sides of the heating plate are axially raised to form heating ridges. One heating ridge can be used for inserting the pipe, and the other heating ridge can be used for sleeveing ​​the head. A handle is also connected to the heating plate.

[0032] The fixing plate is provided with a fixing groove for placing the pipeline part.

[0033] This allows longer pipes to be stably placed on the movable seat and fixed plate, improving welding stability.

[0034] Compared with the existing technology, this plastic pipe welding equipment has the following advantages:

[0035] 1. During the welding process, the welding of pipes and heads can be achieved simply by moving the movable seat back and forth, while the fixed seat can be directly positioned, making the overall welding equipment more convenient; and since only the movable seat is moved, it is ensured that there will be no inadequate or excessive movement during heating and welding, further improving the accuracy of heating and welding.

[0036] 2. When the positioning frame needs to move along the slide rod, one end of the positioning block is swung until the slider is partially located in the slot, and the slider abuts against the slot wall in the longitudinal direction, thereby realizing the connection between the positioning frame and the connecting plate. To remove the positioning frame, one end of the positioning block can be directly swung to separate the positioning block from the slider, and then the entire positioning frame can be removed from the frame body, making it easy to take and place the positioning frame. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] Figure 1 It is a structural schematic diagram of the present invention.

[0038] Figure 2 It is a front view of the present invention.

[0039] Figure 3 yes Figure 2 Cross-sectional view of AA in the figure.

[0040] Figure 4 It is a structural schematic diagram of the movable seat in the present invention.

[0041] Figure 5 It is a partial structural diagram of the positioning frame in the present invention.

[0042] Figure 6 It is a structural schematic diagram of the fixing seat in the present invention.

[0043] Figure 7 It is a structural schematic diagram of the linkage structure and the positioning member after assembly in the present invention.

[0044] In the figure, 1. frame; 11. fixing plate; 11a. fixing groove; 12. sliding rod; 2. fixing seat; 21. fixing member; 21a. fixing screw; 21b. fixing nut; 22. positioning plate; 22a. positioning groove; 23. positioning rod; 24. positioning sleeve; 3. moving seat; 31. connecting member; 31a. connecting screw; 31b. connecting nut; 32. limiting plate; 32a. limiting groove; 33. guide sleeve; 34. supporting rod; 35. limiting rod; 36. limiting sleeve; 4. positioning frame; 41. positioning member; 41a. positioning block; 41b. slot; 41c. opening; 42. sliding block; 43. heating plate; 43a. heating ridge; 43b. handle; 5. linkage structure; 51. connecting plate; 52. adjusting slide groove. DETAILED DESCRIPTION

[0045] The following are specific embodiments of the present invention and the accompanying drawings to further describe the technical solutions of the present invention, but the present invention is not limited to these embodiments.

[0046] Example 1

[0047] like Figure 1As shown, the plastic pipe welding equipment includes a frame 1, on which a fixing seat 2 for positioning the head is fixed.

[0048] Specifically, if Figure 1-7 As shown, a movable seat 3 for longitudinally positioning the pipeline and making the pipeline axially opposite to the head is connected to the frame body 1 in a longitudinal sliding manner. The frame body 1 is detachably connected to a positioning frame 4 located between the fixed seat 2 and the movable seat 3 and capable of heating the head and the pipeline. A linkage structure 5 is provided between the movable seat 3 and the positioning frame 4. When the movable seat 3 moves a set distance relative to the positioning frame 4 in a direction away from the positioning frame 4, the positioning frame 4 can be driven to slide synchronously through the linkage structure 5. The linkage structure 5 includes two connecting plates 51 respectively arranged on the left and right sides of the movable seat 3, the positioning frame 4 and the fixed seat 2. One end of the connecting plate 51 is connected to the movable seat 3 through The connecting member 31 is connected by sliding in the longitudinal direction, and the other end of the connecting plate 51 is connected to the fixed seat 2 by sliding in the longitudinal direction through the fixing member 21. The side wall of the positioning frame 4 is fixedly connected to the middle part of the connecting plate 51 by the positioning member 41. The connecting plates 51 are all provided with adjustment grooves 52 in the longitudinal direction. The connecting member 31 includes a connecting screw 31a fixed on the movable seat 3 and embedded in the adjustment groove 52 and a connecting nut 31b threadedly connected to the connecting screw 31a. The fixing member 21 includes a fixing screw 21a fixed on the fixed seat 2 and embedded in the adjustment groove 52 and a fixing nut 21b threadedly connected to the fixing screw 21a.

[0049] Working principle: Position the pipeline on the movable seat 3, and position the head on the fixed seat 2. At this time, the positioning frame 4 is located between the fixed seat 2 and the movable seat 3, and the movable seat 3 is pushed to move toward the positioning frame 4. When the pipeline of the movable seat 3 is against the positioning frame, the movable seat 3 pushes the positioning frame 4 to move toward the fixed seat 2, so that one side of the positioning frame 4 is against the head, and the positioning frame 4 is positioned by the head. At this time, the movable seat 3 cannot drive the positioning frame 4 to continue to move. After heating the pipeline and the head through the positioning frame 4, the movable seat 3 is moved in the opposite direction, and the pipeline on the movable seat 3 is separated from the positioning frame 4. The movable seat 3 is continued to be moved. When the movable seat 3 moves to the set distance, the movable seat 3 The positioning frame 4 is driven to move synchronously through the linkage structure 5, and moves until the positioning frame 4 is separated from the head, and then the positioning frame 4 is removed from the frame body 1, and then the movable seat 3 is pushed toward the fixed seat 2 to weld the pipe and the head, thereby realizing the welding of the pipe and the head. In this welding process, the welding of the pipe and the head can be achieved only by moving the movable seat 3 back and forth, and the fixed seat 2 can be directly positioned, making the overall welding equipment more convenient; and since only the movable seat 3 is moved, it is ensured that there will be no inadequate movement or excessive movement during heating and welding, further improving the accuracy of heating and welding.

[0050] like Figure 1 、 Figure 2 、 Figure 5and Figure 7 As shown, the frame 1 includes a fixed plate 11 arranged longitudinally opposite to the fixed seat 2, and a fixed groove 11a is provided on the fixed plate 11 for placing the pipeline portion. The fixed seat 2 and the fixed plate 11 are connected by a plurality of parallel sliding rods 12, two of which are located on the left and right sides of the fixed seat 2, and the movable seat 3 is slidably connected to two of the sliding rods 12. The positioning frame 4 includes two sliders 42 respectively placed on two of the sliding rods 12, and the positioning member 41 is a positioning block 41a fixedly connected to the connecting plate 51. One end of the positioning block 41a is provided with a slot 41b with an opening 41c, and one end of the positioning block 41a can be swung until the slider 42 is partially embedded in the slot 41b, and the slider 42 is longitudinally abutted against the slot wall of the slot 41b. The positioning frame 4 includes a heating plate 43 that can heat the pipe and the head at the same time. The sliders 42 are arranged on both sides of the heating plate 43. The side surfaces of the heating plate 43 are axially protruded to form heating ridges 43a. One of the heating ridges 43a can be used for inserting the pipe, and the other heating ridge 43a can be used for sleeveing ​​the head. A handle 43b is also connected to the heating plate 43.

[0051] like Figure 1-4 As shown, the movable seat 3 includes two limit plates 32 arranged longitudinally opposite each other and a driving member 33 arranged between the two limit plates 32 and connected to the two limit plates 32. A limit groove 32a for placing the pipeline is opened on the limit plate 32. The limit plate 32 and the driving member 33 are both mounted on the slide rod 12. The driving member 33 can drive the two limit plates 32 to slide synchronously along the slide rod 12. A plurality of support rods 34 are provided between the two limit plates 32. The plurality of support rods 34 are distributed circumferentially along the outer side of the driving member 33. The ends of both ends of the limit plate 32 are hinged with a limit rod 35 that can press the pipeline into the limit groove 32a. The limit rod 35 is threadedly connected to a limit sleeve 36.

[0052] The driving member 33 is an air cylinder or an oil cylinder.

[0053] like Figure 1 、 Figure 2 、 Figure 3 and Figure 6 As shown, the fixed seat 2 includes a positioning plate 22, which is provided with a positioning groove 22a for the head to be placed. The ends of the positioning plate 22 are hinged with positioning rods 23 that can press the head into the positioning groove 22a. The positioning rods 23 are threadedly connected with positioning sleeves 24. The sliding rod 12 on one side of the fixed seat 2 is higher than the sliding rod 12 on the other side of the fixed seat 2.

[0054] Example 2

[0055] The contents of this embodiment are basically the same as those of the first embodiment, except that the linkage structure 5 includes a telescopic rod 1 connected to the positioning frame 4 and a telescopic rod 2 connected to the movable seat 3, the telescopic rod 1 is embedded in the telescopic rod 2, and the movable seat 3 drives the telescopic rod 2 to move until the telescopic rod 2 cannot move relative to the telescopic rod 1, and then the movable seat 3 synchronously drives the positioning frame 4 to move synchronously.

[0056] The arrangement of the telescopic rod 1 and the telescopic rod 2 makes the linkage structure simpler, and makes the welding of the welding equipment more convenient.

[0057] The specific embodiments described herein are merely illustrative of the spirit of the present invention. Persons skilled in the art may make various modifications, additions, or substitutions to the described specific embodiments without departing from the spirit of the present invention or exceeding the scope of the appended claims.

Claims

1. A plastic pipe welding device, comprising a frame (1), wherein a fixing seat (2) for positioning a head is fixed on the frame (1), characterized in that: The frame (1) is connected to a movable seat (3) for longitudinally positioning the pipeline and making the pipeline and the head axially opposite to each other in a longitudinal sliding manner. The frame (1) is detachably connected to a positioning frame (4) located between the fixed seat (2) and the movable seat (3) and capable of heating the head and the pipeline. The positioning frame (4) can slide in the longitudinal direction. A linkage structure (5) is provided between the movable seat (3) and the positioning frame (4). When the movable seat (3) moves a set distance relative to the positioning frame (4) in a direction away from the positioning frame (4), the positioning frame (4) can be driven to slide synchronously through the linkage structure (5). The linkage structure (5) includes two connecting plates (51) respectively arranged on the left and right sides of the movable seat (3) and the positioning frame (4). The side wall of the movable seat (3) is connected to the corresponding connecting plate (51) in the longitudinal direction through a connecting piece (31). The positioning frame (4) The side wall is fixedly connected to the corresponding connecting plate (51) through a positioning member (41). When the connecting member (31) slides to abut against the connecting plate (51) in the longitudinal direction, the movable seat (3) and the positioning frame (4) slide synchronously. The frame body (1) includes a fixed plate (11) arranged longitudinally opposite to the fixed seat (2). The fixed seat (2) and the fixed plate (11) are connected by a plurality of parallel sliding rods (12). The movable seat (3) includes two longitudinally opposite limiting plates (32) and a driving member (33) arranged between the two limiting plates (32) and connected to the two limiting plates (32). The limiting plates (32) are provided with limiting grooves (32a) for placing pipes. The limiting plates (32) are all sleeved on the sliding rods (12). The driving member (33) can drive the two limiting plates (32) to slide synchronously along the sliding rods (12).

2. The plastic pipe welding equipment according to claim 1, characterized in that: The connecting plates (51) are each provided with an adjusting slot (52) along the longitudinal direction. The connecting member (31) comprises a connecting screw (31a) fixed on the movable seat (3) and embedded in the adjusting slot (52) and capable of sliding along the adjusting slot (52), and a connecting nut (31b) threadedly connected to the connecting screw (31a). The connecting screw (31a) can slide along the longitudinal direction until it abuts against the slot wall at the end of the adjusting slot (52) and is limited in position.

3. The plastic pipe welding equipment according to claim 2, characterized in that: The side wall of the fixing seat (2) is connected to the corresponding connecting plate (51) by sliding in the longitudinal direction via a fixing member (21), the positioning member (41) is located between the connecting member (31) and the fixing member (21), and the fixing member (21) is inserted into the adjusting slot (52) and can slide along the adjusting slot (52).

4. The plastic pipe welding equipment according to claim 3, characterized in that: The fixing member (21) comprises a fixing screw (21a) fixed on the fixing seat (2) and embedded in the adjusting slot (52), and a fixing nut (21b) threadedly connected to the fixing screw (21a).

5. The plastic pipe welding device according to any one of claims 1 to 4, characterized in that: Two of the slide bars (12) are located on the left and right sides of the fixed seat (2), the movable seat (3) is slidably connected to the two slide bars (12), the positioning frame (4) includes two slide bars (42) respectively placed on the two slide bars (12), the positioning member (41) is a positioning block (41a) fixedly connected to the connecting plate (51), one end of the positioning block (41a) is provided with a slot (41b) having an opening (41c), one end of the positioning block (41a) can be swung until the slider (42) is partially embedded in the slot (41b), and the slider (42) abuts against the slot wall of the slot (41b) in the longitudinal direction.

6. The plastic pipe welding device according to claim 5, characterized in that: The ends of both ends of the limiting plate (32) are hinged with limiting rods (35) capable of pressing the pipeline into the limiting groove (32a), and the limiting sleeve (36) is threadedly connected to the limiting rod (35).

7. The plastic pipe welding equipment according to claim 5, characterized in that: The fixing seat (2) includes a positioning plate (22), the positioning plate (22) is provided with a positioning groove (22a) for placing the head, and the ends of both ends of the positioning plate (22) are hinged with positioning rods (23) that can press the head into the positioning groove (22a), and the positioning rods (23) are threadedly connected to the positioning sleeves (24).

8. The plastic pipe welding device according to claim 7, characterized in that: The slide bar (12) located on one side of the fixing seat (2) is higher than the slide bar (12) located on the other side of the fixing seat (2).

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