A traction transport device for MPP cable protection pipe processing

Abstract

The application relates to the technical field of plastic pipe extruders traction devices, and discloses a traction and transportation equipment for MPP cable protection pipe processing, which comprises a mounting seat, the mounting seat is fixedly installed on one side of an extruder, two moving seats are slidably arranged on one side of the mounting seat, a through groove is formed in the middle of the moving seat, a hollow rotating disc is rotatably connected to one side of the moving seat, and a plurality of pressing blocks are movably arranged on one side of the rotating disc close to the extruder. The moving seat is arranged to move synchronously with the material pipe, the rotating disc is driven to rotate, the radial positions of the pressing blocks, the first cutter and the shovel cutter are adjusted, the sleeve jointing, pressing and overflow removing operations of the molten material pipe and the traction pipe are automatically completed in the starting stage, the conveying operation of the material pipe traction butt joint is completed, the fitting degree of the outer diameter of the connecting head and the vacuum sizing device is improved, the possibility of starting breakage caused by loose connection and overflow jamming is reduced, and the starting success rate and the production efficiency are improved.

Description

Technical Field

[0001] This application relates to the field of traction devices for plastic pipe extruders, and more particularly to a traction and transportation device for processing MPP cable protection pipes. Background Technology

[0002] MPP (modified polypropylene) cable protection pipes are widely used for the laying and protection of power cables, and are usually formed by extrusion. The extruder heats and melts the modified polypropylene raw material, and then extrudes it through the die head to form a tubular molten billet. The billet then enters a vacuum sizing device and a cooling device in sequence to form a pipe with specified dimensions and roundness. The traction machine clamps the pipe and conveys it forward at a constant speed. Then, the cutting device cuts the pipe to a predetermined length to complete the finished product processing.

[0003] During the production line start-up phase, the molten tube blanks just extruded from the die head need to be conveyed and pulled to the rear traction machine to establish a traction connection. First, a traction tube with a diameter smaller than the target tube specification is set up. One end of the traction tube passes through the vacuum sizing device, and the other end is clamped in place by the traction machine. After the molten material extruded from the die head is uniformly plasticized, the waste material with poor plasticization in the initial section is cut off with a cutter to expose the qualified molten material head. Then, the clamped end of the traction tube is retracted to the vicinity of the die head. The operator manually wraps the extruded high-temperature molten material head around the outer wall of the traction tube end, and then uses a wet cloth or special tool to compact the melt to make the two stick together. The traction machine pulls at a matching speed, so that the connected tube enters the vacuum sizing device to complete the shaping. After the tube passes through the entire production line and enters a stable production state, the cutting device cuts off the unqualified tube caused by joint defects in the front section, completing the traction and conveying operation in the start-up phase.

[0004] However, after the molten material is laid onto the traction pipe, the material is in a molten state, and when manually wrapping the melt, defects such as incomplete wrapping are likely to occur, resulting in insufficient connection strength. When starting the traction, it is easy to break at the joint, leading to start-up failure. Repeated docking operations are required, affecting production efficiency. Furthermore, since the MPP pipe has a relatively thick wall, typically between 110mm and 250mm, the wall thickness at the joint is relatively large. The overflow block passively adapts to the feed inlet of the vacuum sizing device at the rear end, which may cause the joint to get stuck when entering the vacuum sizing sleeve, increasing the difficulty of subsequent sizing adjustments and further increasing the risk of joint breakage. Summary of the Invention

[0005] This application proposes a traction and transportation device for processing MPP cable protection pipes, which has the advantages of reducing joint thickness and actively adapting to vacuum sizing sleeves, in order to solve the problem that manual application of materials is prone to insufficient strength or overflow in some places, leading to traction failure.

[0006] To achieve the above objectives, this application adopts the following technical solution: a traction and transportation device for processing MPP cable protection pipes, including a mounting base, the mounting base being fixedly installed on one side of an extruder, two movable seats being slidably arranged on one side of the mounting base, a through groove being opened in the middle of the movable seats, a hollow rotating disk being rotatably connected to one side of the movable seats, a plurality of pressure blocks being movably arranged on the side of the rotating disk near the extruder, a plurality of No. 1 cutters being movably arranged on the side of the rotating disk near the extruder, and a scraper being movably arranged on the side of the rotating disk away from the extruder, and also including an adjustment mechanism;

[0007] The adjustment mechanism can drive the two moving seats to move circumferentially, and at the same time drive the pressure block, the first cutter and the shovel to move radially relative to the corresponding moving seats, so that the pressure block moves closer to each other to press and cover the material tube, and the first cutter moves closer to each other and works with the shovel at the corresponding position to remove part of the molten material from the material tube.

[0008] Furthermore, the diameter of the through groove is larger than the outer wall diameter of the molten material tube of the MPP cable protection pipe, the number of the first cutter is adapted to the number of pressure blocks, the side of the pressure block near the axis of the through groove of the moving seat is arc-shaped, and the side of the first cutter near the axis of the through groove is arc-shaped.

[0009] Furthermore, the arc shape of the first cutter is adapted to the arc shape of the pressing block, the number of the first cutter is adapted to the number of pressing blocks, the first cutter and the pressing blocks are arranged alternately, and the number of the spade is set to several and adapted to the number of the first cutter.

[0010] Furthermore, the outer side of the annular portion of the movable seat is provided with several guide grooves, the outer side of the rotating disk is provided with several adjustment grooves, and the adjustment mechanism includes several connecting rods. The connecting rods are slidably engaged with the corresponding guide grooves and slidably sleeved with the corresponding adjustment grooves.

[0011] Furthermore, the number of guide grooves corresponding to the moving seat near the extruder is adapted to the sum of the number of pressure blocks and the number of the first cutter. The guide groove is set as a straight groove extending in the radial direction, the cross-sectional shape of the adjusting groove is arc-shaped, the end of the connecting rod is fixedly provided with a protrusion, the cross-sectional shape of the part of the connecting rod that fits into the guide groove is strip-shaped, and the cross-sectional shape of the part of the connecting rod that fits into the adjusting groove is circular.

[0012] Furthermore, a movable block is fixedly connected to one end of the connecting rod, and the pressure block, the first cutter, and the scraper are all fixedly connected to the corresponding movable block. A toothed ring is fixedly sleeved on the outer side of the rotating disk, and a transmission gear is rotatably connected to one side of the top of the movable seat. A first motor is fixedly installed on one side of the top of the movable seat, and electric push rods are fixedly installed on both sides of the mounting base.

[0013] Furthermore, the transmission gear meshes with the gear ring, the gear ring is configured as an incomplete gear, the output shaft of the first motor is connected to the gear ring, and the output end of the electric push rod is fixedly connected to the moving base.

[0014] Furthermore, it also includes a connecting seat, which is fixedly installed on one side of the extruder. A second cutter for rotating and removing waste material is rotatably installed on one side of the connecting seat, and a second motor is fixedly installed on the other side of the connecting seat. The output end of the second motor is connected to the second cutter in a transmission connection.

[0015] Furthermore, the number of guide grooves corresponding to the movable seat on the side away from the extruder is adapted to the number of shovels, and two nozzles are fixedly installed on the side of the movable seat closer to the extruder.

[0016] The beneficial effects of this invention are as follows:

[0017] This application provides a traction and transportation device for processing MPP cable protection pipes. A movable seat near the extruder drives a pressure block and a first cutter to move radially. The pressure block evenly presses the molten material pipe onto the outer wall of the traction pipe, achieving a preliminary connection. The first cutter cuts off the circumferential overflow generated during the pressing process from the side near the extruder, preventing overflow from accumulating backward. Subsequently, the two movable seats move closer together, and a scraper cooperates with the first cutter to remove excess molten material at the connection point. This allows the outer diameter of the joint to actively adapt to the feed port size of the rear vacuum sizing device, achieving precise control of the wall thickness at the connection point and active adjustment of the outer diameter. This completes the traction and transportation operation of the material pipe during the start-up phase. Compared to the existing technology of manually wrapping the melt, this improves the wrapping effect, ensuring connection strength while reducing the risk of jamming or breakage when the connector enters the vacuum sizing sleeve, thus increasing the start-up success rate.

[0018] In addition, the corresponding No. 1 motor drives the scraper to move radially closer to each other, so that the scraper applies pressure to the radial position that matches the pressure block, thereby further ensuring complete coverage at the joint. At the same time, the nozzle is connected to the refrigerant delivery mechanism. When the two moving seats drive the pressure block, No. 1 cutter and scraper to move radially away, the nozzle sprays cooling water or cooling air onto the joint. While reducing the joint wall thickness, it improves the forced cooling and curing effect on the joint, further improving the connection strength. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort:

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

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

[0022] Figure 3 This is a schematic diagram of the structure of the second cutter of the present invention;

[0023] Figure 4 This is a schematic cross-sectional view of the structure at the toothed ring of the present invention;

[0024] Figure 5 For the present invention Figure 4 Enlarged view of the structure at point A in the image;

[0025] Figure 6 This is a schematic diagram of the shovel part of the present invention.

[0026] In the diagram: 1. Extruder; 2. Mounting base; 3. Material pipe; 4. Traction pipe; 5. Moving base; 6. Rotary disc; 7. Guide groove; 8. Adjusting groove; 9. Connecting rod; 10. Moving block; 11. Pressing block; 12. First cutter; 13. Transmission gear; 14. Gear ring; 15. First motor; 16. Shovel; 17. Electric push rod; 18. Nozzle; 19. Connecting base; 20. Second cutter; 21. Second motor; 22. Vacuum sizing device. Detailed Implementation

[0027] 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.

[0028] Example 1, as Figures 1-4 and Figure 6 A traction and transportation device for processing MPP cable protection pipes includes a mounting base 2, which is fixedly installed on one side of an extruder 1. Two movable seats 5 are slidably arranged on one side of the mounting base 2. The movable seats 5 are located between the extruder 1 and a vacuum sizing device 22. The movable seats 5 can move horizontally without detaching from the mounting base 2. A through groove is opened in the middle of the movable seat 5, so that the part of the movable seat 5 corresponding to the discharge port of the extruder 1 is annular, and the diameter of the through groove is larger than the outer wall diameter of the molten material pipe 3 of the MPP cable protection pipe. A rotating disk 6 is rotatably connected to one side of the movable seat 5.

[0029] The rotating disk 6 is a hollow disk, with the center for the traction pipe 4 and the material pipe 3 to pass through. The rotating disk 6 is located on the side where the two moving seats 5 are close to each other. A pressure block 11 is movably installed on the side of the rotating disk 6 closest to the extruder 1. A first cutter 12 is movably installed on the side of the rotating disk 6 closest to the extruder 1. The side of the pressure block 11 closest to the axis of the through groove of the moving seat 5 is arc-shaped. The diameter of the arc of the pressure block 11 is between the diameters of the traction pipe 4 and the material pipe 3, and is used to press the material pipe 3 onto the traction pipe 4. A scraper 16 is movably installed on the side of the rotating disk 6 furthest from the extruder 1. The scraper 16, the first cutter 12 and the pressure block 11 are all located between the two moving seats 5. The side of the first cutter 12 closest to the axis of the through groove is arc-shaped.

[0030] The arc shape of the first cutter 12 is adapted to the arc shape of the pressure block 11. The number of pressure blocks 11 is set to several, and the several pressure blocks 11 are arranged in a ring with uniform intervals. The number of first cutters 12 is set to several, and is adapted to the number of pressure blocks 11. The several first cutters 12 are arranged in a ring with uniform intervals, and the first cutters 12 and pressure blocks 11 are arranged alternately. The number of scrapers 16 is set to several, and is adapted to the number of first cutters 12. The several scrapers 16 are arranged in a ring with uniform intervals, and their positions correspond to the positions of the first cutters 12. After the first cutters 12 and pressure blocks 11 move radially closer, they can form a ring. The cross-sectional shape of the scraper 16 is adapted to the cross-sectional shape of the first cutter 12, and is used to scrape off excess molten material.

[0031] The outer side of the annular portion of the movable seat 5 is provided with several guide grooves 7. The number of guide grooves 7 on the movable seat 5 near the extruder 1 is matched with the sum of the number of pressure blocks 11 and the number of first cutters 12. The outer side of the rotating disk 6 is provided with several adjustment grooves 8. The guide grooves 7 are straight grooves extending in the radial direction. The cross-sectional shape of the adjustment grooves 8 is arc-shaped. The inner side of the guide grooves 7 is slidably engaged with a connecting rod 9. Specifically, the end of the connecting rod 9 is fixedly provided with a protrusion to restrict the connecting rod 9 from disengaging from the guide grooves 7. The connecting rod 9 is slidably engaged with the corresponding adjustment groove 8. The cross-sectional shape of the part of the connecting rod 9 that engages with the guide groove 7 is strip-shaped to restrict the rotation of the connecting rod 9, so that the connecting rod 9 can move radially along the guide groove 7. The cross-sectional shape of the part of the connecting rod 9 that engages with the adjustment groove 8 is circular to adjust the radial position of the connecting rod 9 by changing the area where the arc part of the adjustment groove 8 overlaps with the guide groove 7.

[0032] One end of the connecting rod 9 is fixedly connected to a moving block 10. The pressure block 11, the first cutter 12, and the scraper 16 are all fixedly connected to the corresponding moving block 10. A gear ring 14 is fixedly sleeved on the outer side of the rotating disk 6. A transmission gear 13 is rotatably connected to one side of the top of the moving seat 5. The transmission gear 13 and the gear ring 14 mesh with each other. The gear ring 14 is set as an incomplete gear. A first motor 15 is fixedly installed on one side of the top of the moving seat 5. The output shaft of the first motor 15 is connected to the gear ring 14. Electric push rods 17 are fixedly installed on both sides of the mounting base 2. The output end of the electric push rod 17 is fixedly connected to the moving seat 5. The mounting base 2 also includes a connecting seat 19. The connecting seat 19 is fixedly installed on one side of the extruder 1. A second cutter 20 is rotatably installed on one side of the connecting seat 19. A second motor 21 is fixedly installed on the other side of the connecting seat 19. The output end of the second motor 21 is connected to the second cutter 20. One end face of the second cutter 20 is flush with the discharge port end face of the extruder 1 and is used to rotate and cut off waste material.

[0033] During the extruder jamming stage, a traction tube with a diameter smaller than the target pipe specification is preset. One end of the traction tube passes through the vacuum sizing device, and the other end is connected to the traction machine at the rear of the production line. After the molten material extruded from the die head is uniformly plasticized, the second motor 21 is started. The second motor 21 drives the second cutter 20 to rotate and swing, cutting off the waste material with poor plasticization in the initial section and exposing the qualified molten material head. The traction machine retracts the clamped end of the traction tube to the vicinity of the die head. At this time, the electric push rod 17 on the side closer to the extruder 1 remains in a retracted state, and the electric push rod 17 on the side farther away from the extruder 1 remains in an extended state, so that the scraper 16 and the corresponding first cutter 12 leave space.

[0034] The extruder 1 extrudes the molten material tube, which passes through the through groove of the moving seat 5 and is sleeved on the outside of the traction tube 4. When the molten material tube moves to the corresponding position inside the pressing block 11, the traction machine at the rear end of the production line drives the traction tube 4 to move axially at a speed adapted to the discharge speed of the extruder 1, so that the traction tube 4 and the end of the material tube move at the same speed. At this time, the electric push rod 17 near the extruder 1 extends, driving the corresponding moving seat 5 to move away from the extruder 1 at a speed adapted to the discharge speed of the extruder 1. At the same time, the first motor 15 starts to drive the transmission gear 13 to rotate. The rotation of the transmission gear 13 drives the gear ring 14 to rotate, thereby driving the rotating disk 6 to rotate circumferentially relative to the moving seat 5.

[0035] The rotating disk 6 drives the adjusting groove 8 to rotate relative to the guide groove 7, changing the corresponding position of the adjusting groove 8 and the guide groove 7. The inner wall of the adjusting groove 8 abuts against the connecting rod 9, causing the connecting rod 9 to move radially along the guide groove 7, thereby driving the corresponding moving block 10 to move radially closer to the axis of the through groove. The moving block 10 drives the pressure block 11 and the first cutter 12 to move radially closer to each other. The pressure block 11 presses the MPP material tube 3 onto the traction tube 4, completing the initial connection between the material tube 3 and the traction tube 4. At this time, the material tube 3 and the part corresponding to the pressure block 11 are under pressure, and the thickness decreases, forming overflow around the pressure block 11. The first cutter 12 cuts the overflow part on the side close to the extruder 1.

[0036] Next, the electric push rod 17 located near the extruder 1 continues to extend, gradually reducing the distance between the two moving seats 5. This brings the scraper 16 and the corresponding first cutter 12 closer together, and at this time, the radial position of the scraper 16 matches the radial position of the first cutter 12. The scraper 16, in conjunction with the first cutter 12, scrapes away part of the molten material, thereby reducing the outer diameter of the connection between the material pipe 3 and the traction pipe 4. This allows the pipe diameter at the joint to actively adapt to the feed port of the vacuum sizing device at the rear end of the production line. While ensuring complete coverage, the wall thickness of the connector is reduced, thereby ensuring connection strength while reducing the possibility of overflow at the joint causing jamming when entering the vacuum sizing sleeve. This also reduces the risk of the connector being pulled apart, ensuring the normal operation of the MPP cable protection pipe processing.

[0037] After the first cutter 12 contacts the scraper 16, the electric push rod 17 on the side away from the extruder 1 retracts. At this time, the first motor 15 drives the corresponding transmission gear 13 to rotate in reverse and reset, thereby driving the pressure block 11 and the first cutter 12 to reset. The two electric push rods 17 drive the two moving seats 5 to move closer to the vacuum sizing device. The traction tube 4 drives the material tube 3 to move to the traction machine at the rear of the production line, completing the traction and conveying operation of the material tube 3 during the start-up stage.

[0038] Example 2, as Figures 1-4 and Figure 6 Based on Example 1, the number of guide grooves 7 corresponding to the movable seat 5 on the side away from the extruder 1 is adapted to the number of shovels 16. Two nozzles 18 are fixedly installed on the side of the movable seat 5 near the extruder 1. The nozzles 18 are located on the side of the movable seat 5 away from the extruder 1. The nozzles 18 are connected to the refrigerant delivery mechanism. The refrigerant is set as cooling water, or it can be set as air.

[0039] After the first cutter 12 moves radially into position, the first motor 15 on the corresponding moving seat 5 of the scraper 16 drives the corresponding moving block 10 to move and adjust the radial position of the scraper 16 so that the radial position of the scraper 16 matches the radial position of the corresponding first cutter 12. After the scraper 16 and the first cutter 12 scrape off part of the molten material, the first motor 15 drives the scraper 16 to move radially closer to each other so that the radial position of the scraper 16 matches the radial position of the pressure block 11. Pressure is applied to the material pipe in this area, thereby further ensuring that the connector is completely covered and that the outer wall diameter of the connector is actively adapted to the shape of the vacuum sizing sleeve, further ensuring that the subsequent connector can smoothly enter the vacuum sizing device.

[0040] Next, as the two moving seats 5 move closer to the vacuum sizing device 22, the two No. 1 motors 15 drive the No. 1 cutter 12, pressure block 11 and scraper 16 to move radially away. At this time, the refrigerant delivery mechanism sprays cooling medium through the nozzle 18. Under the condition that the material pipe 3 is pressed against the traction pipe 4 and the wall thickness of the material pipe 3 is reduced, the connector is cooled and solidified, and the connection of the connector is completed, which further improves the connection strength and avoids the MPP pipe wall being too thick, thus affecting the cooling and solidification effect.

[0041] The above description of the disclosed embodiments enables those skilled in the art to make or use the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A traction and transportation device for processing MPP cable protection pipes, comprising a mounting base (2), wherein the mounting base (2) is fixedly installed on one side of an extruder (1), characterized in that, Two movable seats (5) are slidably arranged on one side of the mounting base (2). A through groove is opened in the middle of the movable seat (5). A hollow rotating disk (6) is rotatably connected to one side of the movable seat (5). Several pressure blocks (11) are movably arranged on the side of the rotating disk (6) near the extruder (1). Several No. 1 cutters (12) are movably arranged on the side of the rotating disk (6) near the extruder (1). A scraper (16) is movably arranged on the side of the rotating disk (6) away from the extruder (1). An adjustment mechanism is also included. The adjustment mechanism can drive the two moving seats (5) to move circumferentially, and at the same time drive the pressing block (11), the first cutter (12) and the shovel (16) to move radially relative to the corresponding moving seat (5), so that the pressing block (11) moves closer to each other to press the material tube (3), and the first cutter (12) moves closer to each other and cooperates with the shovel (16) at the corresponding position to remove part of the molten material in the material tube (3).

2. The traction and transportation equipment for processing MPP cable protection pipes according to claim 1, characterized in that, The diameter of the through groove is larger than the outer wall diameter of the MPP cable protection pipe molten material pipe (3). The number of the first cutter (12) is matched with the number of pressure blocks (11). The side of the pressure block (11) near the axis of the through groove of the moving seat (5) is arc-shaped, and the side of the first cutter (12) near the axis of the through groove is arc-shaped.

3. The traction and transportation equipment for processing MPP cable protection pipes according to claim 1, characterized in that, The arc shape of the first cutter (12) is adapted to the arc shape of the pressure block (11), the number of the first cutter (12) is adapted to the number of pressure blocks (11), the first cutter (12) and the pressure block (11) are arranged alternately, and the number of the spade (16) is set to several and adapted to the number of the first cutter (12).

4. The traction and transportation equipment for processing MPP cable protection pipes according to claim 1, characterized in that, The outer side of the annular portion of the movable seat (5) is provided with several guide grooves (7), and the outer side of the rotating disk (6) is provided with several adjustment grooves (8). The adjustment mechanism includes several connecting rods (9). The connecting rods (9) are slidably engaged with the corresponding guide grooves (7) and slidably sleeved with the corresponding adjustment grooves (8).

5. The traction and transportation equipment for processing MPP cable protection pipes according to claim 4, characterized in that, The number of guide grooves (7) on the moving seat (5) near the extruder (1) is matched with the sum of the number of pressure blocks (11) and the number of first cutters (12). The guide groove (7) is set as a straight groove extending in the radial direction. The cross-sectional shape of the adjusting groove (8) is arc-shaped. The end of the connecting rod (9) is fixedly provided with a protrusion. The cross-sectional shape of the part of the connecting rod (9) that fits into the guide groove (7) is strip-shaped. The cross-sectional shape of the part of the connecting rod (9) that fits into the adjusting groove (8) is circular.

6. The traction and transportation equipment for processing MPP cable protection pipes according to claim 4, characterized in that, One end of the connecting rod (9) is fixedly connected to a moving block (10). The pressing block (11), the first cutter (12) and the shovel (16) are all fixedly connected to the corresponding moving block (10). A toothed ring (14) is fixedly sleeved on the outer side of the rotating disk (6). A transmission gear (13) is rotatably connected to one side of the top of the moving seat (5). A first motor (15) is fixedly installed on one side of the top of the moving seat (5). Electric push rods (17) are fixedly installed on both sides of the mounting base (2).

7. The traction and transportation equipment for processing MPP cable protection pipes according to claim 6, characterized in that, The transmission gear (13) meshes with the gear ring (14), the gear ring (14) is an incomplete gear, the output shaft of the first motor (15) is connected to the gear ring (14) in a transmission connection, and the output end of the electric push rod (17) is fixedly connected to the moving seat (5).

8. The traction and transportation equipment for processing MPP cable protection pipes according to claim 1, characterized in that, It also includes a connecting seat (19), which is fixedly installed on one side of the extruder (1). A second cutter (20) for rotating and cutting off waste is rotatably provided on one side of the connecting seat (19). A second motor (21) is fixedly provided on the other side of the connecting seat (19). The output end of the second motor (21) is connected to the second cutter (20) for transmission.

9. A traction and transportation device for processing MPP cable protection pipes according to claim 6, characterized in that, The number of guide grooves (7) on the movable seat (5) away from the extruder (1) is matched with the number of shovels (16), and two nozzles (18) are fixedly installed on the side of the movable seat (5) close to the extruder (1).

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