Plastic extruding machine for processing polyethylene protective pipe of thermal insulation pipe

Abstract

The utility model discloses a plastic extruding machine for processing a polyethylene protective pipe of a thermal insulation pipe, which comprises a plastic extruding machine, a cooling device is arranged on the outer side of the plastic extruding machine, the cooling device comprises a liquid cooling box, conveying pipes and a cooler, the liquid cooling box is arranged on the outer side of the plastic extruding machine, and the conveying pipes are respectively connected with the input end and the output end of the cooler. A speed regulation device is arranged at the top end of the liquid cooling box and comprises a fixed pipe, a speed regulation groove, a rotating shaft, a connecting pipe, a sliding shaft, a speed regulation sleeve and speed regulation plates, the speed regulation groove is formed in one side of the fixed pipe, the rotating shaft is connected with the speed regulation plate and the speed regulation sleeve, one end of the sliding shaft is slidably located in the speed regulation groove, and the multiple speed regulation plates are arranged on the inner side of the speed regulation sleeve. A clamping mechanism is arranged on the outer side of the fixing pipe, the clamping mechanism comprises a clamping rod, a clamping groove and a clamping sleeve, the clamping rod is arranged on the side wall of the speed adjusting sleeve, and the clamping groove is formed in the outer wall of the connecting pipe, the cooling uniformity and efficiency are remarkably improved, and the adaptability and reliability of equipment under different production requirements are greatly improved.

Description

Technical Field

[0001] This utility model relates to the field of polyethylene pipe processing technology, and more specifically, it relates to an extruder for processing polyethylene pipes for insulation pipes. Background Technology

[0002] In the field of thermal insulation pipe production, the extrusion process of polyethylene protective pipe is a key link, and the extruder, as the core equipment, directly affects the product quality and production efficiency. However, current extrusion technology still has some significant shortcomings in the cooling process. These problems not only affect the quality of the product, but also limit the flexibility and efficiency of the production process, which may negatively impact the output and cost control of the entire production line.

[0003] First, existing extruders have significant efficiency and uniformity issues in cooling. After extrusion, the high-temperature polyethylene sheath needs to be extruded from the output head and cooled. Traditional cooling methods mainly rely on natural air cooling or simple blower cooling. These methods have serious limitations. Natural air cooling is extremely inefficient and cannot meet the high-speed production requirements of modern production lines. While blower cooling is slightly better than natural air cooling, it still cannot achieve rapid and uniform cooling. This uneven cooling can lead to localized stress concentration in the polyethylene sheath during the cooling process, resulting in quality problems such as cracking or deformation. In some applications with high requirements for product surface quality and dimensional accuracy, this uneven cooling can lead to an increased product scrap rate and significantly increase production costs.

[0004] Secondly, to address the issue of low efficiency in air cooling, some production lines have adopted water bath cooling. Theoretically, this method can provide a faster and more uniform cooling effect. However, existing water bath cooling systems often employ a fixed water flow rate design, lacking flexibility and adjustability. This unchanging design cannot adapt to different types of polyethylene materials or different specifications of protective tubing products. For example, some high-density polyethylene materials may require a faster cooling rate to prevent improper crystallization, while some low-density polyethylene materials may require a relatively slow cooling process to ensure the product's flexibility. A fixed cooling water flow rate cannot meet these diverse needs, potentially leading to insufficient or excessive cooling of some products, affecting the physical properties and appearance quality of the final product.

[0005] Furthermore, some improved extruders attempt to control the cooling water flow rate by adding adjustable devices. However, these designs still have significant shortcomings. These devices typically employ relatively simple mechanical structures, which often struggle to maintain long-term stability in continuous industrial environments. Extruders generate continuous vibrations during operation, and the impact of the water flow can cause the adjusting devices to gradually loosen or shift. As a result, the carefully adjusted cooling water flow rate may subtly change during use without the operator noticing for an extended period. This hidden change not only affects the consistency of cooling performance but can also lead to fluctuations in product quality. In applications with stringent performance requirements, this instability can result in serious quality problems or safety hazards. Utility Model Content

[0006] (a) Technical problems to be solved

[0007] In view of the problems existing in the prior art, this utility model provides an extruder for processing polyethylene protective tubes for thermal insulation pipes, so as to solve the technical problems mentioned in the background art.

[0008] (II) Technical Solution

[0009] To achieve the above objectives, this utility model provides the following technical solution: an extruder for processing polyethylene protective tubes for thermal insulation pipes, comprising an extruder, a cooling device disposed on the outside of the extruder, the cooling device comprising a liquid cooling box, a conveying pipe, and a cooler, the liquid cooling box being detachably disposed on the outside of the extruder, the cooler being detachably disposed on one side of the liquid cooling box, the conveying pipe being respectively connected to the input end and the output end of the cooler, and the conveying pipe connected to the input end of the cooler extending into the bottom of the liquid cooling box, a speed regulating device disposed at the top of the liquid cooling box, the speed regulating device comprising a fixed pipe, a speed regulating groove, a rotating shaft, a connecting pipe, a sliding shaft, a speed regulating sleeve, and a speed regulating plate, the top of the fixed pipe being connected to the output of the cooler through the conveying pipe. The system is connected at one end. The speed regulating groove is located on one side of the fixed tube. The rotating shaft is rotatably connected to the speed regulating plate and the speed regulating sleeve respectively. The connecting tube is fixedly connected to the top of the liquid cooling box. One end of the sliding shaft slides in the speed regulating groove, and the other end of the sliding shaft is rotatably connected to the speed regulating plate. The speed regulating sleeve is rotatably connected to the connecting tube and the fixed tube respectively. Multiple speed regulating plates are movably arranged inside the speed regulating sleeve. A clamping mechanism is provided on the outside of the fixed tube. The clamping mechanism includes a clamping rod, a clamping groove, and a clamping sleeve. Multiple clamping rods are slidably arranged on the side wall of the speed regulating sleeve. Multiple clamping grooves are opened on the outer wall of the connecting tube, and the inner end of the clamping rod is inserted into the clamping groove. The inner wall of the clamping sleeve is movably connected to the outer wall of the connecting tube by threads.

[0010] The present invention is further configured such that an output head is connected to the output end of the extruder, and the output head extends to the outside of the liquid cooling box.

[0011] The present invention is further configured such that a guide frame is provided on one side of the liquid cooling box, and the hole provided at the top of the guide frame is coaxial with the output head.

[0012] The present invention is further configured such that a slide rail is detachably provided on one side of the liquid cooling box, and the guide frame is slidably mounted on the slide rail.

[0013] The present invention is further provided that the speed regulating plate has multiple flow holes.

[0014] The present invention is further configured such that a sealing strip is fixedly provided on one side of the fixed tube, and a corresponding sealing groove is provided on the inner side of the speed regulating sleeve, and the sealing strip is inserted into the sealing groove. The cooperation between the sealing strip and the sealing groove prevents the problem of cooling water leakage during the speed regulation process.

[0015] The present invention is further configured such that a connecting spring is provided on the outer side of the speed regulating sleeve, and the outer end of the locking rod is connected to the outer wall of the speed regulating sleeve through the connecting spring. The setting of the connecting spring ensures the accurate reset of the locking rod.

[0016] The present invention is further provided with anti-slip strips fixedly provided on the outer walls of both the ferrule and the speed regulating sleeve. At the same time, the anti-slip strips provided on the outer walls of the ferrule and the speed regulating sleeve increase the friction during operation, thereby improving the accuracy of adjustment and the convenience of operation.

[0017] (III) Beneficial Effects

[0018] Compared with the prior art, this utility model provides an extruder for processing polyethylene protective tubes for thermal insulation pipes, which has the following beneficial effects:

[0019] 1. The innovative cooling device solves the problems of low and uneven cooling efficiency in existing technologies. Through the ingenious combination of liquid cooling box, conveying pipe and cooler, it achieves efficient liquid cooling of the extruder. The liquid cooling box is set close to the outer wall of the extruder to ensure direct and uniform cooling. The cooler and liquid cooling box are connected by conveying pipe to form a closed-loop cooling system, which not only improves cooling efficiency but also realizes the recycling of coolant, greatly reducing resource consumption. This design significantly improves cooling speed and uniformity, effectively avoiding the problems of local stress concentration and product cracking caused by traditional air cooling methods. Combined with the use of guide frames, it not only ensures the smooth output of polyethylene protective pipes but also provides convenience for subsequent processing. This cooling method greatly improves production efficiency, reduces product scrap rate, and provides a solid foundation for the production of high-quality polyethylene protective pipes.

[0020] 2. The speed control device cleverly solves the problem of fixed cooling water flow rate and lack of flexibility in existing technologies. Through the precise cooperation of fixed pipe, speed control groove, rotating shaft, connecting pipe, sliding shaft, speed control sleeve, and speed control plate, precise control of cooling water flow rate is achieved. Multiple flow holes on the speed control plate, in conjunction with the movement of the speed control plate, can flexibly adjust the flow area of ​​cooling water, thereby achieving precise control of flow rate. This design allows operators to quickly adjust the cooling water flow rate according to the characteristics of different polyethylene materials and product specifications, realizing personalized customization of the cooling process. This flexibility greatly improves the adaptability of the equipment, can meet the cooling needs of different products, and effectively avoids product quality problems caused by insufficient or excessive cooling. At the same time, the design of sealing strips and sealing grooves ensures sealing during the speed control process, prevents cooling water leakage, and improves the safety and reliability of the equipment.

[0021] 3. The design of the clamping mechanism effectively solves the problems of loosening and displacement of speed regulating devices in existing technologies. Through the ingenious cooperation of the clamping rod, the clamping groove, and the clamping sleeve, multiple locking of the speed regulating device is achieved. The clamping groove on the outer wall of the clamping rod connecting pipe provides a preliminary positioning function. The clamping sleeve is movably connected to the connecting pipe through threads, which can lock the clamping rod a second time, greatly enhancing the stability of the overall structure. The design of the connecting spring further improves the reliability of the clamping mechanism, ensuring that the clamping rod can accurately return to its original position. This multi-locking mechanism greatly improves the stability of the speed regulating device in high-intensity working environments, effectively preventing the speed regulating device from loosening or displacement due to continuous vibration and water flow impact. This innovation not only ensures that the cooling water flow rate is maintained at the set value for a long time, but also greatly improves the stability of the equipment during continuous operation, effectively avoiding hidden changes caused by structural loosening, thereby preventing potential product quality fluctuations or safety hazards. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the overall structure of an extruder used for processing polyethylene protective tubes for thermal insulation pipes according to this utility model.

[0023] Figure 2 This is a cross-sectional view of the fixed pipe, connecting pipe, and speed regulating sleeve in this utility model.

[0024] Figure 3 This is a schematic diagram of the dispersed structure of the fixed tube and speed regulating sleeve in this utility model;

[0025] Figure 4 This is a schematic diagram of the speed regulating sleeve in this utility model;

[0026] Figure 5 This is a schematic diagram of the dispersed structure of the speed regulating sleeve, connecting pipe, and clamping sleeve in this utility model.

[0027] In the diagram: 1. Extruder; 2. Liquid cooling box; 3. Conveying pipe; 4. Cooler; 5. Fixed pipe; 6. Speed ​​regulating groove; 7. Rotating shaft; 8. Connecting pipe; 9. Sliding shaft; 10. Speed ​​regulating sleeve; 11. Speed ​​regulating plate; 12. Locking rod; 13. Locking slot; 14. Locking sleeve; 15. Output head; 16. Guide frame; 17. Slide rail; 18. Flow hole; 19. Sealing strip; 20. Sealing groove; 21. Connecting spring; 22. Anti-slip strip. Detailed Implementation

[0028] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0029] It should be noted that, unless otherwise specified, all technical and scientific terms used in this application have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains.

[0030] In this utility model, unless otherwise stated, the orientations used, such as "up" and "down", usually refer to the direction shown in the accompanying drawings, or to the vertical, perpendicular, or gravitational direction; similarly, for ease of understanding and description, "left" and "right" usually refer to the left and right shown in the accompanying drawings; "inner" and "outer" refer to the inner and outer contours of each component itself, but the above directional terms are not used to limit this utility model.

[0031] Please see Figures 1-5An extruder for processing polyethylene protective tubes for thermal insulation pipes includes an extruder 1. A cooling device is provided on the outside of the extruder 1. The cooling device includes a liquid cooling box 2, a conveying pipe 3, and a cooler 4. The liquid cooling box 2 is detachably installed on the outside of the extruder 1, and the cooler 4 is detachably installed on one side of the liquid cooling box 2. The conveying pipe 3 is connected to the input end and the output end of the cooler 4, and the conveying pipe 3 connected to the input end of the cooler 4 extends into the bottom of the liquid cooling box 2. A speed regulating device is provided at the top of the liquid cooling box 2. The speed regulating device includes a fixed pipe 5, a speed regulating groove 6, a rotating shaft 7, a connecting pipe 8, a sliding shaft 9, a speed regulating sleeve 10, and a speed regulating plate 11. The top end of the fixed pipe 5 is connected to the output end of the cooler 4 through the conveying pipe 3, and the speed regulating groove 6 is formed in the fixed pipe. On one side, the rotating shaft 7 is rotatably connected to the speed regulating plate 11 and the speed regulating sleeve 10 respectively. The connecting pipe 8 is fixedly connected to the top of the liquid cooling box 2. One end of the sliding shaft 9 is slidably placed in the speed regulating groove 6, and the other end of the sliding shaft 9 is rotatably connected to the speed regulating plate 11. The speed regulating sleeve 10 is rotatably connected to the connecting pipe 8 and the fixed pipe 5 respectively. Multiple speed regulating plates 11 are movably arranged inside the speed regulating sleeve 10. A clamping mechanism is provided on the outside of the fixed pipe 5. The clamping mechanism includes a clamping rod 12, a clamping groove 13 and a clamping sleeve 14. Multiple clamping rods 12 are slidably arranged on the side wall of the speed regulating sleeve 10. Multiple clamping grooves 13 are opened on the outer wall of the connecting pipe 8, and the inner end of the clamping rod 12 is inserted into the clamping groove 13. The inner wall of the clamping sleeve 14 is movably connected to the outer wall of the connecting pipe 8 by threads.

[0032] The extruder 1 has an output head 15 connected to its output end, and the output head 15 extends to the outside of the liquid cooling box 2.

[0033] A guide frame 16 is provided on one side of the liquid cooling box 2, and the hole at the top of the guide frame 16 is coaxial with the output head 15.

[0034] The liquid cooling box 2 has a detachable slide rail 17 on one side, and the guide frame 16 is slidably mounted on the slide rail 17.

[0035] In this embodiment, when the equipment is needed, the guide frame 16 is initially positioned close to the liquid cooling tank 2. First, the heated polyethylene material is placed into the feeding hopper of the extruder 1. Then, the drive device on one side of the extruder 1 is turned on, causing the drive device to run and extruding and shaping the polyethylene material through an external device. Next, the cooler 4 is turned on, and the cooling water in the cooler 4 is transported by the built-in pump. The cooled water is then transported through the delivery pipe 3 connected to the output end of the cooler 4 to the fixed pipe 5. It is then transported to the liquid cooling tank 2 through the fixed pipe 5, speed regulating sleeve 10, flow hole 18, and connecting pipe 8. The cooling water entering the liquid cooling tank 2 then contacts the outer shell of the extruder 1 for heat exchange. Uniform cooling of the shaped polyethylene material is achieved, that is, uniform cooling of the shaped polyethylene protective tube. The polyethylene protective tube is gradually conveyed to the output head 15 for output, so that the polyethylene protective tube enters the circular groove opened at the top of the guide frame 16, so that the guide frame 16 supports one end of the polyethylene protective tube. Then, the guide frame 16 slides along the slide rail 17 to a position away from the liquid cooling box 2. Then, the polyethylene protective tube is conveyed to the subsequent processing equipment for cutting and other subsequent processing. During the cooling operation, the cooling water after heat exchange is drawn out by the conveying pipe 3 connected to the input end of the cooler 4 and then sent back into the cooler 4 for cooling, thereby realizing the recycling of cooling water and ensuring uninterrupted operation of the cooling operation.

[0036] Please see Figures 2-5 As a further implementation of the overall equipment: the speed control plate 11 is provided with multiple flow holes 18.

[0037] A sealing strip 19 is fixedly provided on one side of the fixed pipe 5, and a corresponding sealing groove 20 is provided on the inner side of the speed regulating sleeve 10, and the sealing strip 19 is inserted into the sealing groove 20.

[0038] A connecting spring 21 is provided on the outer side of the speed regulating sleeve 10, and the outer end of the lever 12 is connected to the outer wall of the speed regulating sleeve 10 through the connecting spring 21.

[0039] Both the ferrule 14 and the speed regulating sleeve 10 are fixedly provided with anti-slip strips 22 on their outer walls.

[0040] More specifically, when the cooling water delivery speed needs to be adjusted according to material properties and processing requirements, firstly, rotate the ferrule 14 clockwise, causing it to move along the threaded line on the outer wall of the connecting pipe 8. Then, the inner wall of the ferrule 14 no longer limits the outer end of the clamping rod 12. Next, rotate the speed regulating sleeve 10, which will drive the multiple clamping rods 12 sliding on the side wall to move. Then, the inner wall of the groove 13 on the outer wall of the connecting pipe 8 presses against the inner end of the clamping rod 12. Due to the rounded corner treatment at the edge of the inner wall of the groove 13 and the clamping rod 12... The rounded corners at the ends allow the inner end of the locking rod 12 to slide out of the slot 13, while the outer end of the locking rod 12 stretches the connecting spring 21. Simultaneously, the speed regulating sleeve 10 moves the speed regulating plate 11 via the rotating shaft 7. Since the sliding shaft 9 on the other side of the speed regulating sleeve 10 slides within the speed regulating groove 6, the speed regulating plate 11 drives the sliding shaft 9 to slide along the sliding groove, causing multiple speed regulating plates 11 to move outwards simultaneously. Furthermore, the speed regulating plates 11 move the multiple flow holes 18, causing the position of the flow holes 18 to change. This causes a change in the number of flow holes 18 in the flow path. The movement of multiple speed regulating plates 11, combined with the change in the position of the flow holes 18, alters the cross-sectional area of ​​the corresponding position in the speed regulating sleeve 10, thereby changing the flow area of ​​the cooling water and thus changing the flow rate of the cooling water. After the flow rate is adjusted appropriately, the rotation of the speed regulating sleeve 10 is stopped, and the connecting spring 21 drives the locking rod 12 to slide and reset, so that the inner end of the locking rod 12 slides into the corresponding slot 13. Then, the locking sleeve 14 is rotated in the opposite direction, so that the locking sleeve 14 resets along the thread line. Then, the inner wall of the locking sleeve 14 limits the outer end of the locking rod 12 again, so that the locking rod 12 cannot move. Then, the locking rod 12, together with the slot 13, locks and clamps the speed regulating sleeve 10, so that the speed regulating sleeve 10 cannot move, ensuring the structural stability of the device after speed regulation, thereby ensuring the stable operation of the equipment after speed regulation, and thus ensuring product quality. The setting of the sealing strip 19 and the sealing groove 20 ensures the sealing of the connection between the speed regulating sleeve 10 and the fixed pipe 5, preventing the leakage of cooling water.

[0041] In summary, during the use or operation of the overall equipment: When the equipment is needed, the guide frame 16 is initially positioned close to the liquid cooling tank 2. First, the heated polyethylene material is placed into the feeding hopper of the extruder 1. Then, the drive device on one side of the extruder 1 is turned on, causing the drive device to run and extruding and shaping the polyethylene material through an external device. Then, the cooler 4 is turned on, and the cooling water in the cooler 4 is transported by the built-in delivery pump. The cooled water is then transported to the fixed pipe 5 through the delivery pipe 3 connected to the output end of the cooler 4. Then, it is transported to the liquid cooling tank 2 through the fixed pipe 5, speed regulating sleeve 10, flow hole 18, and connecting pipe 8. The cooling water entering the liquid cooling tank 2 then comes into contact with the outer shell of the extruder 1. Heat exchange is performed to achieve uniform cooling of the shaped polyethylene material, that is, to achieve uniform cooling of the shaped polyethylene protective tube. The polyethylene protective tube is gradually conveyed to the output head 15 for output, so that the polyethylene protective tube enters the circular groove opened at the top of the guide frame 16, so that the guide frame 16 supports one end of the polyethylene protective tube. Then the guide frame 16 slides along the slide rail 17 to a position away from the liquid cooling box 2. Then the polyethylene protective tube is conveyed to the subsequent processing equipment for cutting and other subsequent processing. During the cooling operation, the cooling water after heat exchange is completed is drawn out by the conveying pipe 3 connected to the input end of the cooler 4 and then sent back into the cooler 4 for cooling, thereby realizing the recycling of cooling water and ensuring uninterrupted operation of the cooling operation.

[0042] When the cooling water flow rate needs to be adjusted according to material properties and processing requirements, first rotate the ferrule 14 clockwise, causing it to move along the threaded line on the outer wall of the connecting pipe 8. Then, the inner wall of the ferrule 14 no longer limits the outer end of the clamping rod 12. Next, rotate the speed regulating sleeve 10, which will drive the multiple clamping rods 12 that are slidably set on the side wall to move. Then, the inner wall of the groove 13 on the outer wall of the connecting pipe 8 presses against the inner end of the clamping rod 12. Due to the rounded corners at the edge of the inner wall of the groove 13 and the rounded ends of the clamping rod 12, the flow rate is adjusted accordingly. The angle design allows the inner end of the locking rod 12 to slide out of the slot 13, while the outer end of the locking rod 12 stretches the connecting spring 21. Simultaneously, the speed regulating sleeve 10 moves the speed regulating plate 11 via the rotating shaft 7. Since the sliding shaft 9 on the other side of the speed regulating sleeve 10 slides in the speed regulating groove 6, the speed regulating plate 11 drives the sliding shaft 9 to slide along the sliding groove, causing multiple speed regulating plates 11 to move outwards simultaneously. Furthermore, the speed regulating plate 11 moves the multiple flow holes 18, and the change in the position of the flow holes 18 causes... The number of flow holes 18 in the flow path changes, and the movement of multiple speed regulating plates 11, combined with the change in the position of the flow holes 18, changes the cross-sectional area of ​​the corresponding position in the speed regulating sleeve 10, thereby changing the flow area of ​​the cooling water and thus changing the flow rate of the cooling water. After the conveying speed is adjusted appropriately, the rotation of the speed regulating sleeve 10 is stopped, and the connecting spring 21 drives the locking rod 12 to slide and reset, so that the inner end of the locking rod 12 slides into the corresponding slot 13. Then, the locking sleeve 14 is rotated in the opposite direction, so that the locking sleeve 14 resets along the thread line. Then, the inner wall of the locking sleeve 14 limits the outer end of the locking rod 12 again, so that the locking rod 12 cannot move. Then, the locking rod 12, together with the slot 13, locks and clamps the speed regulating sleeve 10, so that the speed regulating sleeve 10 cannot move, ensuring the structural stability of the device after speed regulation, thereby ensuring the stable operation of the equipment after speed regulation, and thus ensuring product quality. The setting of the sealing strip 19 and the sealing groove 20 ensures the sealing of the connection between the speed regulating sleeve 10 and the fixed pipe 5, preventing the leakage of cooling water.

[0043] Of all the solutions mentioned above, those involving the connection between two components can be selected according to the actual situation, such as welding, bolt and nut connection, bolt or screw connection, or other known connection methods, which will not be elaborated here. For all the fixed connections mentioned above, welding is preferred. Although embodiments of this utility model have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of this utility model. The scope of this utility model is defined by the appended claims and their equivalents.

Claims

1. An extruder for processing polyethylene protective tubes for thermal insulation pipes, comprising an extruder (1), characterized in that: A cooling device is provided on the outside of the extruder (1). The cooling device includes a liquid cooling box (2), a conveying pipe (3), and a cooler (4). The liquid cooling box (2) is located on the outside of the extruder (1). The conveying pipe (3) is connected to the input end and the output end of the cooler (4) respectively. A speed regulating device is provided on the top of the liquid cooling box (2). The speed regulating device includes a fixed pipe (5), a speed regulating groove (6), a rotating shaft (7), a connecting pipe (8), a sliding shaft (9), a speed regulating sleeve (10), and a speed regulating plate (11). The speed regulating groove (6) is opened on one side of the fixed pipe (5). The rotating shaft (7) is connected to the speed regulating plate (11) and the speed regulating sleeve (9). 10) Connection, one end of the sliding shaft (9) slides in the speed regulating groove (6), and the other end is connected to the speed regulating plate (11). The speed regulating sleeve (10) is rotatably connected to the connecting pipe (8) and the fixed pipe (5). Multiple speed regulating plates (11) are set inside the speed regulating sleeve (10). A clamping mechanism is set outside the fixed pipe (5). The clamping mechanism includes a clamping rod (12), a clamping groove (13) and a clamping sleeve (14). Multiple clamping rods (12) are set on the side wall of the speed regulating sleeve (10). Multiple clamping grooves (13) are opened on the outer wall of the connecting pipe (8). The inner wall of the clamping sleeve (14) is movably connected to the outer wall of the connecting pipe (8) by threads.

2. An extruder for processing polyethylene protective tubes for thermal insulation pipes according to claim 1, characterized in that: The extruder (1) is connected to an output head (15) at its output end, and the output head (15) extends to the outside of the liquid cooling box (2).

3. An extruder for processing polyethylene protective tubes for thermal insulation pipes according to claim 2, characterized in that: The liquid cooling box (2) is provided with a guide frame (16) on one side, and the hole at the top of the guide frame (16) is coaxial with the output head (15).

4. An extruder for processing polyethylene protective tubes for thermal insulation pipes according to claim 3, characterized in that: The liquid cooling box (2) is detachably provided with a slide rail (17) on one side, and the guide frame (16) is slidably mounted on the slide rail (17).

5. An extruder for processing polyethylene protective tubes for thermal insulation pipes according to any one of claims 1-4, characterized in that: The speed control plate (11) has multiple flow holes (18).

6. An extruder for processing polyethylene protective tubes for thermal insulation pipes according to claim 5, characterized in that: A sealing strip (19) is fixedly provided on one side of the fixed tube (5), and a sealing groove (20) is correspondingly provided on the inner side of the speed regulating sleeve (10), and the sealing strip (19) is inserted into the sealing groove (20).

7. An extruder for processing polyethylene protective tubes for thermal insulation pipes according to claim 1, characterized in that: The speed regulating sleeve (10) is provided with a connecting spring (21) on the outside, and the outer end of the lever (12) is connected to the outer wall of the speed regulating sleeve (10) through the connecting spring (21).

8. An extruder for processing polyethylene protective tubes for thermal insulation pipes according to claim 7, characterized in that: The outer walls of both the ferrule (14) and the speed regulating sleeve (10) are fixedly provided with anti-slip strips (22).

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