A large-diameter plastic pipe extrusion post-cooling and shaping device

Abstract

This invention discloses a cooling and shaping device for large-diameter plastic pipes after extrusion, relating to the field of plastic pipe cooling production technology. The device achieves its intended use by using a reversing positioning frame assembly to fix the plastic pipe connector to the plastic pipe and adjust its angle. When clamping and positioning the plastic pipe connector, the rotating moving bracket is first flipped along the position of the upper fixed bracket. At this time, the inner drive cylinder drives the inner clamping plate to move along the direction of the guide rod, clamping the plastic pipe connector between the inner clamping plate and the clamping panel. After clamping and fixing, the rotating moving bracket is flipped along the direction of the upper fixed bracket. The clamping panel is rotatably mounted on the bottom bracket. A drive motor is fixedly mounted on the surface of the bottom bracket, and the output end of the drive motor is fixedly connected to the rotating shaft of the bottom bracket. The angle of the clamping panel can be changed by adjusting the rotation of the drive motor, ensuring flexible angle assembly of the plastic pipe connector.

Description

Technical Field

[0001] This invention relates to the field of plastic pipe cooling production technology, specifically to a cooling and shaping device for large-diameter plastic pipes after extrusion. Background Technology

[0002] Plastic pipes are generally made from synthetic resin, namely polyester, with the addition of stabilizers, lubricants, plasticizers, etc., and are processed by extrusion in a pipe-making machine using a "plastic" method. They are mainly used for piping in water supply systems, drainage, ventilation, and sewage systems in buildings, underground drainage systems, rainwater pipes, and conduits for electrical wiring installations.

[0003] CN113510287A discloses a cutting device for cooling plastic pipes, including a base, a fixing component, and a cutting cylinder. A drive unit is fixedly connected to the upper surface of the base, and the moving end of the drive unit is fixedly connected to a clamping unit. The cutting cylinder is located directly above the base, and a cutting component is fixedly connected to the output end of the cutting cylinder. The cutting cylinder is connected to the air supply component through an air guide pipe with a through hole. This cutting device for cooling plastic pipes, through the cooperation of the drive unit, moving device, switching component, sealing plug, air guide pipe, and cutting cylinder, allows the device to fix the workpiece during cutting, and the two are carried out simultaneously. This solves the problem that existing cutting devices are separate from the clamps used to fix the raw materials, requiring the raw materials to be fixed before cutting, which is very troublesome. However, if the raw materials are not fixed, cutting errors may occur.

[0004] It also has certain drawbacks. Due to the needs of production and assembly, the cleanliness of the inside of the plastic pipe is not high enough, and there are still some impurities inside. At the same time, the plastic pipe connectors do not have a specific clamping and fixing method between the plastic pipes and the assembly of the plastic pipes. Their rotation flexibility is not enough, and they cannot be installed for different specifications and types of plastic pipes. Summary of the Invention

[0005] To address the shortcomings of existing technologies, this invention provides a cooling and shaping device for large-diameter plastic pipes after extrusion, which solves the problems mentioned in the background art.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a cooling and shaping device for large-diameter plastic pipes after extrusion, comprising a fixed bracket, an installation panel movably disposed on the upper side of the fixed bracket, a cooling box assembly fixedly disposed on the upper end of the installation panel, and a reversing positioning frame assembly movably disposed on the side of the fixed bracket away from the cooling box assembly. Since the production and assembly of plastic pipe cooling requires the production and assembly of the plastic pipe and plastic pipe connectors to achieve the desired effect, the cooling box assembly cleans the internal body of the plastic pipe before production and assembly. Simultaneously, the reversing positioning frame assembly secures the connection between the plastic pipe connectors and the plastic pipe and adjusts the angle accordingly to achieve the desired effect.

[0007] The reversing positioning frame assembly includes a rotating shaft rotatably mounted on a fixed bracket, a bottom bracket fixedly mounted on the upper end of the rotating shaft, a snap-fit ​​panel rotatably mounted on the bottom bracket, an adjustment panel snapped onto the upper surface of the snap-fit ​​panel, an upper fixed bracket fixedly mounted on the upper surface of the adjustment panel, a rotating movable bracket rotatably mounted on the upper fixed bracket, a clamping panel fixedly mounted on the rotating movable bracket, and an inner clamping plate movably mounted on the rotating movable bracket.

[0008] A first bevel gear is fixedly mounted on the surface of the rotating shaft. A rotating platform bracket is fixedly mounted on the bottom of the fixed bracket. A second bevel gear is rotatably mounted on the rotating platform bracket. A side knob is fixedly mounted on the outer side of the shaft end of the second bevel gear. When it is necessary to clamp and position the plastic tube connector, the rotating moving bracket is first flipped over along the position of the upper fixed bracket. At this time, the inner drive cylinder is driven, which moves the inner clamping plate along the direction of the guide rod, so that the plastic tube connector is clamped between the inner clamping plate and the clamping panel. After clamping and fixing, the rotating moving bracket is flipped along the direction of the upper fixed bracket. The snap-fit ​​panel is rotatably mounted on the bottom bracket. A drive motor is fixedly mounted on the surface of the bottom bracket. The output end of the drive motor is fixedly connected to the rotating shaft of the bottom bracket. The angle of the snap-fit ​​panel can be changed by adjusting the rotation of the drive motor. At the same time, the snap-fit ​​of the adjustment panel with the snap-fit ​​panel allows the components on the adjustment panel to be replaced at any time.

[0009] As a further aspect of the present invention: the first bevel gear and the second bevel gear mesh with each other, and the first bevel gear and the second bevel gear are of equal size. At the same time, by rotating the side knob, the second bevel gear is driven to rotate. The second bevel gear meshes with the first bevel gear, and the rotation of the second bevel gear drives the first bevel gear to rotate, thereby allowing the bottom support to rotate as well, adjusting the vertical rotation of the bottom support.

[0010] As a further aspect of the present invention: an inner drive cylinder is fixedly disposed on the surface of the clamping panel, and a guide rod is also fixedly disposed on the surface of the clamping panel. The piston rod end of the inner drive cylinder is fixedly connected to the end face of the inner clamping plate. The guide rod passes through the surface of the inner clamping plate, and a hole groove adapted to the guide rod is opened on the surface of the inner clamping plate to facilitate clamping between the clamping panel and the inner clamping plate.

[0011] As a further aspect of the present invention: the pivot of the snap-fit ​​panel and the bottom bracket passes through the surface of the bottom bracket, and a drive motor is fixedly mounted on the surface of the bottom bracket, with the output end of the drive motor fixedly connected to the pivot of the bottom bracket.

[0012] As a further aspect of the present invention: a telescopic cylinder is fixedly mounted on the upper surface of the fixed bracket, and the cooling box assembly is fixedly mounted on the piston rod end of the telescopic cylinder. The cooling box assembly includes a cooling box body fixedly mounted on a mounting panel. An internal bidirectional threaded rod is rotatably mounted inside the cooling box body. Two downward moving blocks are threaded onto the internal bidirectional threaded rod, and the two downward moving blocks are symmetrically arranged on the internal bidirectional threaded rod. A downward moving guide groove is opened at the bottom of the cooling box body, and each downward moving block is slidably mounted in the downward moving guide groove. A lifting adjustment component is fixedly mounted on the upper surface of each downward moving block, and a lifting adjustment component is fixedly mounted on the upper end of each lifting adjustment component. A chuck seat is provided, and a cleaning water tank is fixedly installed at the upper bottom of the cooling box body. The upper bottom of the cooling box body is movably mounted on the cooling spray pipe via a drive cylinder. The plastic tube for cooling is initially clamped inside the cooling box body. Since the size of the plastic tubes cooled by different specifications is not consistent, it is now necessary to rotate the adjustment knob to drive the internal bidirectional threaded rod to rotate. At the same time, the rotation of the internal bidirectional threaded rod drives the lower moving block to move along the direction of the lower moving guide groove. The distance between the two lower moving blocks changes accordingly with the rotation of the internal bidirectional threaded rod. Simultaneously, the lifting adjustment component on the lower moving block adjusts the height value of the chuck seat, allowing the chuck seat to adjust the plastic tube accordingly.

[0013] As a further aspect of the present invention: the output end of the cleaning water tank is connected to the input end of the cooling spray pipe via a connecting hose, so that the cleaning fluid inside the cleaning water tank is sprayed out through the cooling spray pipe, and the cooling spray pipe cleans the plastic tube inside the cooling tank body to ensure the required precision during assembly.

[0014] As a further aspect of the present invention: the lifting adjustment assembly includes a fixed seat fixed on the upper side of the lower moving block and the bottom of the chuck seat, and a bidirectional threaded connecting rod. Each fixed seat has a connecting rod rotatably arranged on both sides. Two movable connecting parts are threaded on the surface of the bidirectional threaded connecting rod, and the movable connecting parts are rotatably connected to the connecting rod.

[0015] As a further aspect of the present invention: an adjustment knob is fixedly provided on one end of the bidirectional threaded connecting rod. By adjusting the adjustment knob, the corresponding height of the lifting adjustment component can be adjusted to clamp and fix plastic tubes of different sizes.

[0016] Beneficial effects

[0017] This invention provides a cooling and shaping device for large-diameter plastic pipes after extrusion. Compared with the prior art, it has the following advantages:

[0018] 1. A cooling and shaping device for large-diameter plastic pipes after extrusion, which achieves the desired effect by fixing the plastic pipe connector to the plastic pipe and adjusting its angle through a reversing positioning frame assembly. When the plastic pipe connector needs to be clamped and positioned, the rotating moving bracket is first flipped along the position of the upper fixed bracket. At this time, the inner drive cylinder is driven, which moves the inner clamping plate along the direction of the guide rod, so that the plastic pipe connector is clamped between the inner clamping plate and the clamping panel. After clamping and fixing, the rotating moving bracket is flipped along the direction of the upper fixed bracket. The clamping panel is rotatably set on the bottom bracket. A drive motor is fixedly set on the surface of the bottom bracket. The output end of the drive motor is fixedly connected to the rotating shaft of the bottom bracket. The angle of the clamping panel can be changed by adjusting the rotation of the drive motor, so as to ensure flexible angle assembly of the plastic pipe connector.

[0019] 2. The plastic tubes used for cooling are initially clamped inside the cooling box body. Since the sizes of the plastic tubes being cooled vary depending on their specifications, it is now necessary to rotate the adjustment knob to rotate the internal bidirectional threaded rod. Simultaneously, the rotation of the internal bidirectional threaded rod causes the lower moving block to move along the direction of the lower moving guide groove. The distance between the two lower moving blocks changes accordingly with the rotation of the internal bidirectional threaded rod. At the same time, the lifting adjustment component on the lower moving block adjusts the height of the chuck seat, allowing the chuck seat to adjust the plastic tube accordingly. This ensures the cleanliness of the plastic tube while clamping plastic tubes of different sizes. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the structure of the present invention;

[0021] Figure 2 This is a schematic diagram of the rear structure of the present invention;

[0022] Figure 3 for Figure 1 Enlarged view of the structure at point A in the middle;

[0023] Figure 4 This is a schematic diagram of the internal structure of the cooling box assembly of the present invention.

[0024] In the diagram: 1. Cooling box assembly; 11. Cooling box body; 12. Cleaning water tank; 13. Drive cylinder; 14. Cooling spray pipe; 15. Chuck seat; 16. Lifting adjustment assembly; 17. Lower moving block; 18. Internal bidirectional threaded rod; 19. Lower moving guide groove; 110. Adjustment knob; 2. Reverse positioning frame assembly; 21. Bottom bracket; 22. Upper fixed bracket; 23. Rotary moving bracket; 24. Adjustment panel; 25. Snap-fit ​​panel; 26. Rotary table bracket; 27. First bevel gear; 28. Rotating shaft; 29. ​​Second bevel gear; 210. Side knob; 212. Clamping panel; 213. Guide rod; 214. Internal drive cylinder; 215. Internal clamping plate; 3. Mounting panel; 4. Telescopic cylinder; 5. Fixed bracket. Detailed Implementation

[0025] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0026] Please see Figures 1-4 This invention provides a technical solution: a cooling and shaping device for large-diameter plastic pipes after extrusion, including a fixed bracket 5, an installation panel 3 movably disposed on the upper side of the fixed bracket 5, a cooling box assembly 1 fixedly disposed on the upper end of the installation panel 3, and a reversing positioning frame assembly 2 movably disposed on the side of the fixed bracket 5 away from the cooling box assembly 1. Since the production and assembly of plastic pipe cooling requires the production and assembly of the plastic pipe and plastic pipe connectors to achieve the desired effect, the cooling box assembly 1 cleans the internal body of the plastic pipe before production and assembly. At the same time, the reversing positioning frame assembly 2 fixes the connection between the plastic pipe connectors and the plastic pipe and adjusts the angle to achieve the desired effect.

[0027] The reversing positioning frame assembly 2 includes a rotating shaft 28 rotatably mounted on a fixed bracket 5. A bottom bracket 21 is fixedly mounted on the upper end of the rotating shaft 28. A snap-fit ​​panel 25 is rotatably mounted on the bottom bracket 21. An adjustment panel 24 is snapped onto the upper surface of the snap-fit ​​panel 25. An upper fixed bracket 22 is fixedly mounted on the upper surface of the adjustment panel 24. A rotating moving bracket 23 is rotatably mounted on the upper fixed bracket 22. A clamping panel 212 is fixedly mounted on the rotating moving bracket 23. An inner clamping plate 215 is also movably mounted on the rotating moving bracket 23.

[0028] A first bevel gear 27 is fixedly mounted on the surface of the rotating shaft 28. A rotating platform bracket 26 is fixedly mounted on the bottom of the fixed bracket 5. A second bevel gear 29 is rotatably mounted on the rotating platform bracket 26. A side knob 210 is fixedly mounted on the outer side of the shaft end of the second bevel gear 29. When it is necessary to clamp and position the plastic tube connector, the rotating moving bracket 23 is first flipped along the position of the upper fixed bracket 22. At this time, the inner drive cylinder 214 is driven, which drives the inner clamping plate 215 to move along the direction of the guide rod 213, so that the inner clamping plate 215 and the inner clamping plate 215 and the inner clamping plate 215 are aligned. The clamping panels 212 clamp the plastic tube connector. After clamping and fixing, the rotating moving bracket 23 is flipped along the direction of the upper fixed bracket 22. The snap-fit ​​panel 25 is rotatably mounted on the bottom bracket 21. A drive motor is fixedly mounted on the surface of the bottom bracket 21. The output end of the drive motor is fixedly connected to the rotating shaft of the bottom bracket 21. The angle of the snap-fit ​​panel 25 can be changed by adjusting the rotation of the drive motor. At the same time, the snap-fit ​​of the adjustment panel 24 onto the snap-fit ​​panel 25 allows the components on the adjustment panel 24 to be replaced at any time.

[0029] The first bevel gear 27 and the second bevel gear 29 mesh with each other, and the first bevel gear 27 and the second bevel gear 29 are of equal size. At the same time, by rotating the side knob 210, the second bevel gear 29 is driven to rotate. The second bevel gear 29 meshes with the first bevel gear 27. The rotation of the second bevel gear 29 drives the first bevel gear 27 to rotate, thereby allowing the bottom bracket 21 to also rotate, adjusting the vertical rotation of the bottom bracket 21.

[0030] An inner drive cylinder 214 is fixedly disposed on the surface of the clamping panel 212, and a guide rod 213 is also fixedly disposed on the surface of the clamping panel 212. The piston rod end of the inner drive cylinder 214 is fixedly connected to the end face of the inner clamping plate 215. The guide rod 213 penetrates the surface of the inner clamping plate 215, and the surface of the inner clamping plate 215 is provided with a hole or groove that matches the guide rod 213, so as to facilitate clamping between the clamping panel 212 and the inner clamping plate 215.

[0031] The pivot of the snap-fit ​​panel 25 and the bottom bracket 21 passes through the surface of the bottom bracket 21, and a drive motor is fixedly installed on the surface of the bottom bracket 21. The output end of the drive motor is fixedly connected to the pivot of the bottom bracket 21.

[0032] A telescopic cylinder 4 is fixedly mounted on the upper surface of the fixed bracket 5. The cooling box assembly 1 is fixedly mounted on the piston rod end of the telescopic cylinder 4. The cooling box assembly 1 includes a cooling box body 11 fixedly mounted on the mounting panel 3. An internal bidirectional threaded rod 18 is rotatably mounted inside the cooling box body 11. Two lower moving blocks 17 are threaded on the internal bidirectional threaded rod 18, and the two lower moving blocks 17 are symmetrically arranged on the internal bidirectional threaded rod 18. A lower moving guide groove 19 is opened at the bottom of the cooling box body 11. Each lower moving block 17 is slidably mounted in the lower moving guide groove 19. A lifting adjustment assembly 16 is fixedly mounted on the upper surface of each lower moving block 17. A chuck seat 1 is fixedly mounted on the upper end of each lifting adjustment assembly 16. 5. A cleaning water tank 12 is fixedly installed at the bottom of the upper end of the cooling box body 11. The bottom of the upper end of the cooling box body 11 is movably installed in the cooling spray pipe 14 through the drive cylinder 13. The plastic tube for cooling is initially clamped inside the cooling box body 11. Since the size of the plastic tubes cooled by different specifications is not consistent, it is now necessary to rotate the adjustment knob 110 to drive the inner bidirectional threaded rod 18 to rotate. At the same time, the rotation of the inner bidirectional threaded rod 18 drives the lower moving block 17 to move along the direction of the lower moving guide groove 19. The distance between the two lower moving blocks 17 changes accordingly with the rotation of the inner bidirectional threaded rod 18. At the same time, the lifting adjustment component 16 on the lower moving block 17 adjusts the height value of the chuck seat 15 so that the chuck seat 15 adjusts the plastic tube accordingly.

[0033] The output end of the cleaning water tank 12 is connected to the input end of the cooling spray pipe 14 via a connecting hose, so that the cleaning fluid inside the cleaning water tank 12 is sprayed out through the cooling spray pipe 14, and the cooling spray pipe 14 cleans the plastic tube inside the cooling box body 11 to ensure the accuracy required during assembly.

[0034] The lifting adjustment assembly 16 includes a fixed seat fixed on the upper side of the lower moving block 17 and the bottom of the chuck seat 15, and a bidirectional threaded connecting rod. Each fixed seat has a connecting rod rotatably arranged on both sides. Two movable connecting parts are threaded on the surface of the bidirectional threaded connecting rod, and the movable connecting parts are rotatably connected to the connecting rod.

[0035] An adjustment knob is fixedly installed on one end of the bidirectional threaded connecting rod. By adjusting the adjustment knob, the corresponding height of the lifting adjustment component 16 can be adjusted to clamp and fix plastic tubes of different sizes.

[0036] In use, this invention requires the assembly of the plastic pipe and its connectors during the production of the cooling process to achieve the desired effect. The cooling box assembly 1 cleans the internal structure of the plastic pipe before assembly. Simultaneously, the reversing positioning frame assembly 2 secures the connection between the connectors and the plastic pipe, adjusting the angle to achieve the desired effect. When clamping and positioning the connectors, the rotating moving bracket 23 is first flipped along the position of the upper fixed bracket 22. At this time, the inner drive cylinder 214 drives the inner clamping plate 215 to move along the direction of the guide rod 213, clamping the connectors between the inner clamping plate 215 and the clamping panel 212. After clamping and fixing, the rotating moving bracket 23 is flipped along the direction of the upper fixed bracket 22, and the locking panel 25 is rotatably mounted on the bottom bracket 21. A drive motor is fixedly mounted on the surface of the bottom bracket 21. The output end of the drive motor is fixedly connected to the rotating shaft of the bottom bracket 21. The angle of the locking panel 25 can be changed by adjusting the rotation of the drive motor. At the same time, the locking of the adjustment panel 24 onto the locking panel 25 allows the components on the adjustment panel 24 to be replaced at any time. The plastic tube for cooling is initially clamped inside the cooling box body 11. Since the size of the plastic tubes for cooling different specifications is not consistent, it is now necessary to rotate the adjustment knob 110 to drive the internal bidirectional threaded rod 18 to rotate. At the same time, the rotation of the internal bidirectional threaded rod 18 drives the lower moving block 17 to move along the direction of the lower moving guide groove 19. The distance between the two lower moving blocks 17 changes accordingly with the rotation of the internal bidirectional threaded rod 18. Meanwhile, the lifting adjustment component 16 on the lower moving block 17 adjusts the height of the chuck seat 15, allowing the chuck seat 15 to adjust the plastic tube accordingly.

[0037] In the description of this invention, it should be understood that the terms "upper," "lower," "left," and "right," etc., indicating orientation or positional relationships based on the orientation or positional relationships shown in the accompanying drawings, are only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or a specific orientational structure and operation. Therefore, they should not be construed as limitations on the invention. Furthermore, "first" and "second" are only for descriptive purposes and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, unless otherwise stated, "multiple" means two or more.

Claims

1. A cooling and shaping device for large-diameter plastic pipes after extrusion, comprising a fixed support (5), characterized in that: The upper side of the fixed bracket (5) is movably provided with a mounting panel (3), and a cooling box assembly (1) is fixedly provided on the upper end of the mounting panel (3). A reversing positioning frame assembly (2) is movably provided on the side of the fixed bracket (5) away from the cooling box assembly (1). The reversing positioning frame assembly (2) includes a rotating shaft (28) rotatably mounted on a fixed bracket (5). A bottom bracket (21) is fixedly mounted on the upper end of the rotating shaft (28). A snap-fit ​​panel (25) is rotatably mounted on the bottom bracket (21). An adjustment panel (24) is snapped onto the upper surface of the snap-fit ​​panel (25). An upper fixed bracket (22) is fixedly mounted on the upper surface of the adjustment panel (24). A rotating moving bracket (23) is rotatably mounted on the upper fixed bracket (22). A clamping panel (212) is fixedly mounted on the rotating moving bracket (23). An inner clamping plate (215) is also movably mounted on the rotating moving bracket (23). A first bevel gear (27) is fixedly mounted on the surface of the rotating shaft (28), a rotating table support (26) is fixedly mounted on the bottom of the fixed support (5), a second bevel gear (29) is rotatably mounted on the rotating table support (26), and a side knob (210) is fixedly mounted on the outer side of the shaft end of the second bevel gear (29). An inner drive cylinder (214) is fixedly provided on the surface of the clamping panel (212), and a guide rod (213) is also fixedly provided on the surface of the clamping panel (212). The piston rod end of the inner drive cylinder (214) is fixedly connected to the end face of the inner clamping plate (215). The guide rod (213) passes through the surface of the inner clamping plate (215), and a hole groove adapted to the guide rod (213) is opened on the surface of the inner clamping plate (215). A telescopic cylinder (4) is fixedly mounted on the upper surface of the fixed bracket (5). The cooling box assembly (1) is fixedly mounted on the piston rod end of the telescopic cylinder (4). The cooling box assembly (1) includes a cooling box body (11) fixedly mounted on the mounting panel (3). An internal bidirectional threaded rod (18) is rotatably mounted inside the cooling box body (11). Two lower moving blocks (17) are threaded on the internal bidirectional threaded rod (18), and the two lower moving blocks (17) are symmetrically arranged on the internal bidirectional threaded rod (18). The bottom of the cooling box body (11) is provided with a lower moving guide groove (19), each of the lower moving blocks (17) is slidably disposed in the lower moving guide groove (19), each of the lower moving blocks (17) is fixedly disposed with a lifting adjustment component (16) on the upper surface, each of the lifting adjustment components (16) is fixedly disposed with a chuck seat (15) on the upper end, a cleaning water tank (12) is fixedly disposed at the bottom of the upper end of the cooling box body (11), and the bottom of the upper end of the cooling box body (11) is movably disposed on the cooling spray pipe (14) by a drive cylinder (13).

2. A post-extrusion cooling and sizing device for large diameter plastic pipe according to claim 1, characterized in that: The first bevel gear (27) meshes with the second bevel gear (29), and the first bevel gear (27) and the second bevel gear (29) are of equal size.

3. The cooling and shaping device for large-diameter plastic pipes after extrusion according to claim 1, characterized in that: The pivot of the snap-fit ​​panel (25) and the bottom bracket (21) passes through the surface of the bottom bracket (21), and a drive motor is fixedly installed on the surface of the bottom bracket (21). The output end of the drive motor is fixedly connected to the pivot of the bottom bracket (21).

4. A post-extrusion cooling and sizing device for large diameter plastic pipe according to claim 1, characterized in that: The output end of the cleaning water tank (12) is connected to the input end of the cooling spray pipe (14) via a connecting hose.

5. A post-extrusion cooling and sizing device for large diameter plastic pipe according to claim 1, characterized in that: The lifting adjustment assembly (16) includes a fixed seat and a bidirectional threaded connecting rod fixed on the upper side of the lower moving block (17) and the bottom of the chuck seat (15). Each fixed seat has a connecting rod rotatably arranged on both sides. Two movable connecting parts are threaded on the surface of the bidirectional threaded connecting rod. The movable connecting parts are rotatably connected to the connecting rod.

6. A post-extrusion cooling and sizing device for large diameter plastic pipe according to claim 5, characterized in that: An adjustment knob is fixedly installed on one end of the bidirectional threaded connecting rod.

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