An extrusion device for polypropylene cable protection tube production

Abstract

The application belongs to the technical field of cable sheath production, and particularly discloses an extrusion device for polypropylene cable sheath production, which comprises a die sleeve and a die core, a cavity is formed in the bottom of the die sleeve and extends to the inside, the bottom of the cavity is conical, the top of the die core is conical, and the die core is arranged inside the cavity. During the process of the cable core passing through the hollow shaft, the end of the cable core will trigger the guide assembly to work when passing through the through hole, so that the channel for conveying the molten polypropylene material in the die core is opened, and when the hollow shaft rotates to push the material, the arc-shaped protrusions at the end will be clamped with the arc-shaped opening, thereby driving the distribution device to work and cleaning the annular filter plate. When the pressure in the die core is too large, it indicates that the permeability of the annular filter plate decreases, and more granular polypropylene is accumulated on one side. At this time, the feedback assembly can be triggered to work to guide the granular polypropylene out of the side flow channel.

Description

Technical Field

[0001] This invention relates to the field of cable conduit manufacturing technology, and in particular to an extrusion apparatus for the production of polypropylene cable protective conduits. Background Technology

[0002] Cables are mainly used to transmit electrical energy, information and realize electromagnetic energy conversion. They are usually long and transmit complex types of data. In order to protect the cables, cable protection pipes are generally made of polypropylene as raw material. Polypropylene has the characteristics of high strength, toughness, high temperature resistance, corrosion resistance, good insulation, no pollution and not easy to age. Polypropylene raw materials are processed into cable protection pipes through extrusion molding. When producing polypropylene cable protection pipes, an extrusion molding device is required in conjunction with screw injection molding to coat the polypropylene raw material onto the outer surface of the cable core. However, since the gap between the mold sleeve and the mold core is open, the supply of materials can only be controlled by an external control valve. When the cable core is fed into the mold sleeve before it has passed through the mold core, the material inside the mold sleeve will flow back into the mold core and adhere to the inner wall of the mold core, increasing the resistance between the inner wall of the mold core and the cable core. This will cause the cable core to easily experience a jerky feeling during subsequent transportation, which will affect the uniformity of the protective tube covering the outer surface of the cable core. Summary of the Invention

[0003] In order to solve the problems existing in the prior art, the present invention provides an extrusion device for the production of polypropylene cable protection pipes.

[0004] To achieve the above objectives, the present invention adopts the following technical solution: an extrusion device for producing polypropylene cable protection pipes, comprising a die sleeve and a die core, wherein the bottom of the die sleeve has an inner cavity extending into the interior, the bottom of the inner cavity is conical, the top of the die core is conical, the die core is disposed inside the inner cavity, and a gap is left between the conical surface of the die core and the conical surface of the inner cavity, the top of the die core is located below the inner top surface of the inner cavity, a cylindrical groove extending into the bottom is formed inside the die core, and a through hole extending into the cylindrical groove is formed at the top of the die core, wherein a guide component is disposed in the through hole; The cylindrical groove is equipped with a distributing device, the mold core is equipped with a feedback component that works in conjunction with the distributing device, the top of the mold sleeve is fixed with a transition tube that extends to the bottom of the inner cavity, and a tapered check sleeve is fixed between the inner walls of the through hole near the top edge.

[0005] Preferably, an outer sleeve is fixed between the outer surface of the transition tube and the top of the mold sleeve. Side tubes are fixedly connected to both outer surfaces of the outer sleeve. One side tube is located at the top of the outer sleeve, and the other side tube is located at the bottom of the outer sleeve. A feeding tube is provided below the bottom of the mold sleeve. One end of the feeding tube is inserted between the inner walls of the inner cavity, and one end of the feeding tube is sealed and fitted to the bottom of the mold core.

[0006] Preferably, the inside of the feeding tube is provided with a hollow shaft, one end of which slides through to the outside of one end of the feeding tube, an external toothed ring is fixed on the outer surface of the hollow shaft near one end edge, a spiral blade is fixed on the outer surface of the hollow shaft, the spiral blade is located inside the feeding tube, and the other end of the hollow shaft extends into the cylindrical groove and has multiple arc-shaped protrusions.

[0007] Preferably, a conical guide cylinder is provided on the inner bottom surface of the cylindrical groove. The interior of the conical guide cylinder is connected to one end of the through hole. The conical surface of the conical guide cylinder extends to the center of the bottom of the cylindrical groove. Multiple discharge ports are equidistantly opened on the inner bottom surface of the cylindrical groove outside the conical guide cylinder. Gaskets are fixed between the inner walls of the cylindrical groove near the bottom edge.

[0008] Preferably, the guide assembly includes multiple reciprocating blocks, and the inner wall of the through hole is provided with multiple reciprocating grooves at equal intervals along the circumferential direction. The multiple reciprocating blocks are slidably and sealingly disposed between the inner walls of the reciprocating grooves. One side of each of the multiple reciprocating blocks is provided with a through-hole extending to the bottom. One side of each of the multiple reciprocating blocks is provided with a graphite copper sheet. One side of each of the multiple graphite copper sheets is arc-shaped, and the other side is correspondingly engaged inside the through-hole.

[0009] Preferably, the outer surface of the mold core is provided with a plurality of receiving grooves at equal intervals along the circumferential direction. One end of each of the plurality of receiving grooves is located inside the conical surface of the inner cavity. The top surface of each of the plurality of receiving grooves is provided with a recessed cavity. The bottom surface of each of the plurality of receiving grooves is connected to one end of the discharge port. A sliding plate is provided between the inner walls of each of the plurality of receiving grooves. A bent flow channel is provided on one side of each of the plurality of sliding plates.

[0010] Preferably, one end of each of the multiple bent flow channels extends to the bottom of the slide plate and is opposite to the discharge port. A push rod is fixed on one side of each of the multiple slide plates. One end of each push rod slides through the reciprocating groove and is fixed on the reciprocating block. A spring sheet is fixed on one side of the inner wall of each of the multiple recessed cavities. One end of each spring sheet is correspondingly engaged with the outer surface of the slide plate.

[0011] Preferably, the sorting device includes an annular filter plate, an annular sealing sleeve is fixed on the inner side of the annular filter plate, the annular sealing sleeve is sealed and fitted on the bottom of the conical guide cylinder, two annular sleeves are provided on the inner side of the annular sealing sleeve, the top of the annular filter plate is close to the edge and fits against the bottom of the gasket ring, a rotating ring is rotatably provided on the bottom of the annular filter plate near the inner side, the bottom of the rotating ring is provided with a plurality of arc-shaped openings at equal intervals along the circumferential direction, and a plurality of arc-shaped levers are fixed at equal intervals along the circumferential direction on the outer surface of the rotating ring, one side of each of the plurality of arc-shaped levers is slidably fitted against the outer surface of the annular filter plate.

[0012] Preferably, the feedback component includes two sensing plates. The inner walls of both sides of the cylindrical groove are provided with side cavities below the bottom of the annular filter plate. The top surface of each of the two side cavities is provided with a side flow channel that extends into the discharge port. The two sensing plates are correspondingly and slidably sealed between the inner walls of the side cavities. A guide ring is provided between the inner walls of the cylindrical groove below the bottom of the side cavity. The top of the guide ring is arc-shaped and concave, located at the bottom edge of the annular filter plate. A heating resistor is provided inside the mold core.

[0013] Preferably, adjustment cavities are provided on both sides of the mold core. Push plates are slidably arranged between the inner walls of the two adjustment cavities near one edge. Adjustment bolts are rotatably arranged on one side of the two push plates. One end of each adjustment bolt extends through to the outer surface of the mold core. Sliding plates are slidably arranged between the inner walls of the two adjustment cavities near the other edge. A thin wire spring is fixed between one side of each sliding plate and the other side of each push plate. A guide rod is fixed on the other side of each sliding plate. One end of each guide rod slides through into the side cavity and is fixed to one side of the sensing plate.

[0014] Compared with the prior art, the beneficial effects of the present invention are: 1. In this invention, when the cable core passes through the hollow shaft, the end of the cable core passes through the through hole, which triggers the working of the guide component, opening the channel for conveying molten polypropylene material inside the mold core. When the hollow shaft rotates and pushes the material, it engages with the arc-shaped opening at the end through the arc-shaped protrusion, thereby driving the sorting device to work and clean the annular filter plate. When the pressure inside the mold core is too high, it indicates that the permeability of the annular filter plate has decreased and there is a lot of granular polypropylene accumulating on one side. At this time, the feedback component can be triggered to work and discharge the granular polypropylene from the side channel. 2. When the guide component of this invention is working, when the end of the cable core passes through the through hole, it will contact the arc surface on one side of the graphite copper sheet, thereby pushing the graphite copper sheet together with the push rod to the outside of the mold core. When pushed, it will drive the slide plate to slide to the outside of the receiving groove, so that one end of the bending flow channel is connected to the discharge port. At this time, the material located between the inside of the cylindrical groove and the outer surface of the conical guide cylinder can flow from the discharge port into the bending flow channel, and then flow into the gap between the inner cavity and the mold core, and finally concentrate in the gap between the top of the mold core and the inner cavity to cover the outer surface of the cable core. 3. When the sorting device in this invention is working, the arc-shaped protrusion at the end of the hollow shaft engages with the arc-shaped opening at the bottom of the rotating ring. When the hollow shaft rotates, it can drive the rotating ring to rotate. At the same time, the rotating ring will drive the arc-shaped deflector to slide along the bottom of the annular filter plate, pushing the polypropylene particles filtered and accumulated at the bottom of the annular filter plate to the edge of the annular filter plate, thereby ensuring the permeability of the annular filter plate. 4. When the feedback component of this invention is working, during normal operation, when the pressure at the bottom of the annular filter plate increases, it indicates that there are a lot of polypropylene particles accumulated at the bottom of the annular filter plate. The arc-shaped baffle alone cannot push the polypropylene particles away in time. At this time, the increased pressure will push the sensing plate into the side cavity, so that the side flow channel and the part of the side cavity located on one side of the sensing plate are connected. At this time, with the movement of the arc-shaped baffle, the polypropylene particles can be discharged from the bottom edge of the annular filter plate and flow into the side flow channel. Attached Figure Description

[0015] Figure 1 This invention provides a front-view three-dimensional structural schematic diagram of an extrusion device for the production of polypropylene cable protection pipes; Figure 2 This invention provides a cross-sectional perspective view of an extrusion apparatus for the production of polypropylene cable protection pipes. Figure 3 This invention provides a three-dimensional cross-sectional view of one side of the die sleeve in an extrusion device for the production of polypropylene cable protection pipes. Figure 4 This invention provides a three-dimensional cross-sectional view of the other side of the die sleeve in an extrusion device for the production of polypropylene cable protection pipes. Figure 5 This invention provides a front-view three-dimensional structural diagram of the die core in an extrusion device for the production of polypropylene cable protection pipes. Figure 6 This invention provides a bottom-view three-dimensional structural diagram of the die core in an extrusion device for the production of polypropylene cable protection pipes. Figure 7 This invention provides a cross-sectional three-dimensional structural diagram of the die core in an extrusion device for the production of polypropylene cable protection pipes. Figure 8For the present invention Figure 3 A magnified view of a portion of point A in the middle; Figure 9 For the present invention Figure 7 A magnified view of a portion of point B in the middle; Figure 10 For the present invention Figure 7 A magnified view of a portion of point C.

[0016] In the diagram: 1. Mold sleeve; 2. Feed tube; 3. Transition tube; 4. Outer sleeve; 5. Side tube; 6. Hollow shaft; 7. External toothed ring; 8. Inner cavity; 9. Spiral blade; 10. Mold core; 11. Cylindrical groove; 12. Through hole; 13. Heating resistor; 14. Conical guide tube; 15. Receiving groove; 16. Slide plate; 17. Bending flow channel; 18. Side flow channel; 19. Guide ring; 20. Washer ring; 21. Recessed cavity; 22. Spring plate; 23. 24. Push rod; 25. Reciprocating groove; 26. Reciprocating block; 27. Bayonet; 28. Graphite copper sheet; 29. ​​Conical check sleeve; 30. Adjusting bolt; 31. Annular filter plate; 32. Annular sealing sleeve; 33. Annular bundle sleeve; 34. Rotary ring; 35. Arc-shaped lever; 36. Arc-shaped opening; 37. Side cavity; 38. Discharge port; 39. Induction plate; 40. Adjusting cavity; 41. Guide rod; 42. Sliding plate; 43. Push plate; 44. Fine wire spring. Detailed Implementation

[0017] 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.

[0018] Please see Figure 1-10 The present invention provides a technical solution: an extrusion device for producing polypropylene cable protection pipes, comprising a die sleeve 1 and a die core 10. The bottom of the die sleeve 1 is provided with an inner cavity 8 extending into the interior. The bottom of the inner cavity 8 is conical. The top of the die core 10 is conical. The die core 10 is disposed inside the inner cavity 8, and a gap is left between the conical surface on the die core 10 and the conical surface of the inner cavity 8. The top of the die core 10 is located below the inner top surface of the inner cavity 8. A cylindrical groove 11 extending into the bottom is provided inside the die core 10. A through hole 12 extending into the cylindrical groove 11 is provided on the top of the die core 10. A guide component is disposed in the through hole 12. The cylindrical groove 11 is equipped with a distributing device, and the mold core 10 is equipped with a feedback component that works in conjunction with the distributing device. The top of the mold sleeve 1 is fixed with a transition tube 3 that extends to the bottom of the inner cavity 8. A tapered check sleeve 28 is fixed between the inner walls of the through hole 12 and near the top edge. An outer sleeve 4 is fixed between the outer surface of the transition tube 3 and the top of the mold sleeve 1. Side tubes 5 are fixedly connected to both outer surfaces of the outer sleeve 4. One side tube 5 is located at the top of the outer sleeve 4, and the other side tube 5 is located at the bottom of the outer sleeve 4. A feeding tube 2 is provided below the bottom of the mold sleeve 1. One end of the feeding tube 2 is inserted between the inner walls of the inner cavity 8, and the other end of the feeding tube 2 is sealed and fitted to the bottom of the mold core 10. A hollow shaft 6 is provided inside the feeding tube 2. One end of the hollow shaft 6 slides through to the outside of one end of the feeding tube 2. An external toothed ring 7 is fixed on the outer surface of the hollow shaft 6 near one edge. A spiral blade 9 is fixed on the outer surface of the hollow shaft 6. The spiral blade 9 is located inside the feeding tube 2. The other end of the hollow shaft 6 extends into the cylindrical groove 11 and has multiple arc-shaped protrusions. A conical guide cylinder 14 is provided on the bottom surface of the cylindrical groove 11. The interior of the conical guide cylinder 14 is connected to one end of the through hole 12. The cone of the conical guide cylinder 14 extends to the center of the bottom of the cylindrical groove 11. Multiple discharge ports 37 are equidistantly opened on the bottom surface of the cylindrical groove 11 outside the conical guide cylinder 14. A gasket ring 20 is fixed between the inner walls of the cylindrical groove 11 near the bottom edge.

[0019] The effect achieved is as follows: the mold core 10 is placed in the inner cavity 8, and the feeding pipe 2 is connected to the inner cavity 8 opened at the bottom of the mold sleeve 1, so that one end of the feeding pipe 2 is pressed against the bottom of the mold core 10. Then, the conical guide cylinder 14 is installed on the inner bottom surface of the cylindrical groove 11, and the cone shape of the conical guide cylinder 14 extends towards the middle of the bottom of the mold core 10. This makes the cavity between the inner bottom surface of the cylindrical groove 11 and the outer surface of the conical guide cylinder 14 smaller, while the cavity between the end of the cylindrical groove 11 located at the bottom of the mold core 10 and the outer surface of the conical guide cylinder 14 is larger. Therefore, the material subsequently flows from the outlet... The pressure at the outlet 37 is greater than the initial pressure when it enters the cylindrical groove 11, which facilitates the material flow. Inside the feed pipe 2, the hollow shaft 6 drives the spiral blades 9 to transport the molten polypropylene to the mold core 10. Simultaneously, the cable core passes through the other end of the hollow shaft 6, passing sequentially through the inner side of the conical guide cylinder 14 and the inner side of the through hole 12 inside the mold core 10, and then through the transition pipe 3 before exiting. During this process, when the end of the cable core passes through the through hole 12, it triggers the guiding assembly to operate, allowing the molten polypropylene material to be conveyed inside the mold core 10. The channel is opened, allowing the outer surface of the cable core to be covered during the cable core conveying process. Simultaneously, when the hollow shaft 6 rotates and pushes the material, it engages with the arc-shaped opening 35 through the arc-shaped protrusion at its end, thereby driving the sorting device to clean the annular filter plate 30. When the internal pressure of the mold core 10 is too high, it indicates that the permeability of the annular filter plate 30 has decreased, and there is a large accumulation of granular polypropylene on one side. At this time, the feedback component is triggered to discharge the granular polypropylene from the side flow channel 18. During the discharge process, it is heated and melted again, finally exiting through the discharge port 3. 7. The flow of polypropylene is coated onto the outer surface of the cable core, which avoids direct discharge of granular polypropylene and waste, and achieves the purpose of recycling granular polypropylene. After the cable core is coated, when the cable core flows out, under the guidance of the transition pipe 3, the outer surface of the coating layer of the cable core can be smoothed, making it smoother. At the same time, the pipe supplying external cooling water is connected to the side pipe 5 at the top of the outer sleeve 4, and the side pipe 5 at the bottom of the outer sleeve 4 is connected to the external water outlet pipe, so as to cool the transition pipe 3 and achieve the purpose of cooling the cable core with the protective coating layer.

[0020] like Figure 3 , Figure 4 , Figure 7 and Figure 9As shown, the guide assembly includes multiple reciprocating blocks 25. Multiple reciprocating grooves 24 are equidistantly formed along the circumferential direction on the inner wall of the through hole 12. The multiple reciprocating blocks 25 are slidably and sealingly disposed between the inner walls of the reciprocating grooves 24. A through-hole 26 extending to the bottom is formed on one side of each of the multiple reciprocating blocks 25. A graphite copper sheet 27 is provided on one side of each of the multiple reciprocating blocks 25. One side of each graphite copper sheet 27 is arc-shaped, and the other side is correspondingly engaged inside the slot 26. Multiple receiving grooves 15 are equidistantly formed along the circumferential direction on the outer surface of the mold core 10. One end of each receiving groove 15 is located inside the conical surface of the inner cavity 8. The inner top surface of each receiving groove 15 is opened... There is a recessed cavity 21, and the inner bottom surfaces of multiple receiving slots 15 are all connected to one end of the discharge port 37. Slide plates 16 are slidably sealed between the inner walls of multiple receiving slots 15. A bent flow channel 17 is opened on one side of multiple slide plates 16. One end of multiple bent flow channels 17 extends to the bottom of slide plate 16 and is opposite to discharge port 37. A push rod 23 is fixed on one side of multiple slide plates 16. One end of multiple push rods 23 slides through into the reciprocating groove 24 and is fixed on reciprocating block 25. A spring plate 22 is fixed on one side of the inner wall of multiple recessed cavities 21. One end of multiple spring plates 22 is correspondingly engaged with the outer surface of slide plate 16.

[0021] The effect achieved is that when the end of the cable core passes through the through hole 12, it will contact the arc surface of one side of the graphite copper sheet 27, thereby pushing the graphite copper sheet 27 together with the push rod 23 to the outside of the mold core 10. When pushed, it will drive the slide plate 16 to slide to the outside of the receiving groove 15, so that one end of the bending flow channel 17 is connected to the discharge port 37. At this time, the material located between the inside of the cylindrical groove 11 and the outer surface of the conical guide cylinder 14 can flow from the discharge port 37 into the bending flow channel 17, and then flow into the gap between the inner cavity 8 and the mold core 10. Finally, it is concentrated in the gap between the top of the mold core 10 and the inner cavity 8, covering the outer surface of the cable core. In the graphite copper sheet 27, the graphite is equidistantly embedded inside the copper sheet, and one end of the graphite extends to the outer surface of the copper sheet. Therefore, when the outer surface of the cable core contacts the outer surface of the graphite copper sheet 27, it can slide smoothly under the lubrication of the graphite end.

[0022] like Figure 3 , Figure 4 , Figure 6 and Figure 8As shown, the sorting device includes an annular filter plate 30, an annular sealing sleeve 31 is fixed on the inner side of the annular filter plate 30, the annular sealing sleeve 31 is sealed and fitted on the bottom of the conical guide cylinder 14, two annular sleeves 32 are provided on the inner side of the annular sealing sleeve 31, the top of the annular filter plate 30 is close to the edge and is in contact with the bottom of the gasket ring 20, a rotating ring 33 is rotatably provided on the bottom of the annular filter plate 30 near the inner side, a plurality of arc-shaped openings 35 are equidistantly opened on the bottom of the rotating ring 33 along the circumferential direction, a plurality of arc-shaped levers 34 are fixed equidistantly on the outer surface of the rotating ring 33 along the circumferential direction, and one side of each of the plurality of arc-shaped levers 34 is slidably in contact with the outer surface of the annular filter plate 30.

[0023] The effect achieved is that the arc-shaped protrusion at the end of the hollow shaft 6 engages with the arc-shaped opening 35 at the bottom of the rotating ring 33. When the hollow shaft 6 rotates, it drives the rotating ring 33 to rotate. At the same time, the rotating ring 33 drives the arc-shaped baffle 34 to slide along the bottom of the annular filter plate 30, pushing the polypropylene particles accumulated at the bottom of the annular filter plate 30 toward the edge of the annular filter plate 30, thereby ensuring the permeability of the annular filter plate 30.

[0024] like Figure 3 , Figure 7 , Figure 9 and Figure 10 As shown, the feedback assembly includes two sensing plates 38. Side cavities 36 are formed on both inner walls of the cylindrical groove 11 below the bottom of the annular filter plate 30. Side flow channels 18 extending to the discharge port 37 are formed on the top surface of each of the two side cavities 36. The two sensing plates 38 are correspondingly and slidably sealed between the inner walls of the side cavities 36. A guide ring 19 is provided between the inner walls of the cylindrical groove 11 below the bottom of the side cavities 36. The top of the guide ring 19 is arc-shaped and concave, located at the bottom edge of the annular filter plate 30. A heating resistor 13 is provided inside the mold core 10. Adjustment... A push plate 42 is slidably disposed between the inner walls of the two adjustment cavities 39 and near one edge. An adjustment bolt 29 is rotatably disposed on one side of each of the two push plates 42. One end of each of the two adjustment bolts 29 extends through to the outer surface of the mold core 10. A sliding plate 41 is slidably disposed between the inner walls of the two adjustment cavities 39 and near the other edge. A thin wire spring 43 is fixed between one side of each sliding plate 41 and the other side of each push plate 42. A guide rod 40 is fixed on the other side of each sliding plate 41. One end of each guide rod 40 slides through into the side cavity 36 and is fixed to one side of the sensing plate 38.

[0025] The effect is as follows: during normal operation, when the pressure at the bottom of the annular filter plate 30 increases, it indicates that there are many polypropylene particles accumulated at the bottom of the annular filter plate 30. The arc-shaped baffle 34 alone cannot push the polypropylene particles away in time. At this time, the increased pressure will push the induction plate 38 into the side cavity 36, so that the side flow channel 18 and the part of the side cavity 36 located on the side of the induction plate 38 are connected. At this time, with the action of the arc-shaped baffle 34, the polypropylene particles can flow from the bottom edge of the annular filter plate 30 into the side flow channel 18. During the flow, the polypropylene particles are guided by the arc-shaped recess at the top of the guide ring 19, preventing the polypropylene particles from flowing downward from the bottom edge of the annular filter plate 30, resulting in incomplete discharge. The material located in the side flow channel 18 melts after being heated by the heating resistor 13 during the flow process, and finally flows out from the discharge port 37 together with the normally flowing out material to coat the outer surface of the cable core.

[0026] Working principle: The cable core is passed through the other end of the hollow shaft 6, and then through the inner side of the conical guide cylinder 14 and the inner side of the through hole 12 inside the mold core 10, and then through to the transition tube 3 before being discharged. During this process, when the end of the cable core passes through the through hole 12, it will contact the arc surface of one side of the graphite copper sheet 27, thereby pushing the graphite copper sheet 27 and the push rod 23 to the outside of the mold core 10. When pushed, the sliding plate 16 will slide to the outside of the receiving groove 15, so that one end of the bending flow channel 17 is connected to the discharge port 37. At this time, the material located between the inside of the cylindrical groove 11 and the outer surface of the conical guide cylinder 14 can flow from the discharge port 37 into the bending flow channel. In step 17, the fluid flows into the gap between the inner cavity 8 and the mold core 10, and finally concentrates in the gap between the top of the mold core 10 and the inner cavity 8, covering the outer surface of the cable core. At the same time, the arc-shaped protrusion at the end of the hollow shaft 6 engages with the arc-shaped opening 35 at the bottom of the rotating ring 33. When the hollow shaft 6 rotates, it drives the rotating ring 33 to rotate. As the rotating ring 33 rotates, it drives the arc-shaped baffle 34 to slide along the bottom of the annular filter plate 30, pushing the polypropylene particles accumulated at the bottom of the annular filter plate 30 towards the edge of the annular filter plate 30, thereby ensuring the permeability of the annular filter plate 30. During normal operation, when the bottom of the annular filter plate 30... When the pressure increases, it indicates that there are a large number of polypropylene particles accumulated at the bottom of the annular filter plate 30. The arc-shaped baffle 34 alone cannot disperse the polypropylene particles in time. At this time, the increased pressure will push the sensing plate 38 into the side cavity 36, making the side flow channel 18 connected to the part of the side cavity 36 located on the side of the sensing plate 38. At this time, with the action of the arc-shaped baffle 34, the polypropylene particles can flow from the bottom edge of the annular filter plate 30 into the side flow channel 18. During the flow, the polypropylene particles are guided by the arc-shaped recess at the top of the guide ring 19, preventing the polypropylene particles from flowing downward from the bottom edge of the annular filter plate 30. This results in incomplete discharge. The material inside the side channel 18 melts after being heated by the heating resistor 13 during the flow process. Finally, it flows out from the outlet 37 and, together with the normally flowing out material, coats the outer surface of the cable core. After the cable core is coated, when the cable core flows out, under the guidance of the transition pipe 3, the outer surface of the coating layer of the cable core can be smoothed, making it smoother. At the same time, the external cooling water supply pipe is connected to the side pipe 5 at the top of the outer sleeve 4, and the side pipe 5 at the bottom of the outer sleeve 4 is connected to the external water outlet pipe, so that the transition pipe 3 can be cooled to achieve the purpose of cooling the cable core with the protective coating layer.

[0027] Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. An extrusion apparatus for producing polypropylene cable protection pipes, characterized in that, The mold includes a mold sleeve (1) and a mold core (10). The bottom of the mold sleeve (1) has an inner cavity (8) that extends into the interior. The bottom of the inner cavity (8) is conical, and the top of the mold core (10) is conical. The mold core (10) is located inside the inner cavity (8), and there is a gap between the conical surface on the mold core (10) and the conical surface of the inner cavity (8). The top of the mold core (10) is located below the inner top surface of the inner cavity (8). The interior of the mold core (10) has a cylindrical groove (11) that extends into the bottom. The top of the mold core (10) has a through hole (12) that extends into the cylindrical groove (11). A guide component is provided in the through hole (12). The cylindrical groove (11) is provided with a distributing device inside, the mold core (10) is provided with a feedback component that works in conjunction with the distributing device inside, the top of the mold sleeve (1) is fixed with a transition tube (3) that extends through to the bottom of the inner cavity (8), and a tapered check sleeve (28) is fixed between the inner walls of the through hole (12) near the top edge.

2. The extrusion apparatus for producing polypropylene cable protection pipes according to claim 1, characterized in that: An outer sleeve (4) is fixed between the outer surface of the transition tube (3) and the top of the mold sleeve (1). Side tubes (5) are fixedly connected to both outer surfaces of the outer sleeve (4). One side tube (5) is located at the top of the outer sleeve (4), and the other side tube (5) is located at the bottom of the outer sleeve (4). A feeding tube (2) is provided below the bottom of the mold sleeve (1). One end of the feeding tube (2) is inserted between the inner walls of the inner cavity (8), and one end of the feeding tube (2) is sealed and fitted to the bottom of the mold core (10).

3. An extrusion apparatus for producing polypropylene cable protection pipes according to claim 2, characterized in that: The inside of the feeding tube (2) is provided with a hollow shaft (6). One end of the hollow shaft (6) slides through to the outside of one end of the feeding tube (2). An external toothed ring (7) is fixed on the outer surface of the hollow shaft (6) near one end edge. A spiral blade (9) is fixed on the outer surface of the hollow shaft (6). The spiral blade (9) is located inside the feeding tube (2). The other end of the hollow shaft (6) extends into the cylindrical groove (11) and has multiple arc-shaped protrusions.

4. An extrusion apparatus for producing polypropylene cable protection pipes according to claim 1, characterized in that: The inner bottom surface of the cylindrical groove (11) is provided with a conical guide cylinder (14). The interior of the conical guide cylinder (14) is connected to one end of the through hole (12). The cone of the conical guide cylinder (14) extends to the center of the bottom of the cylindrical groove (11). The inner bottom surface of the cylindrical groove (11) is provided with multiple discharge ports (37) at equal intervals on the outer side of the conical guide cylinder (14). A gasket (20) is fixed between the inner walls of the cylindrical groove (11) near the bottom edge.

5. An extrusion apparatus for producing polypropylene cable protection pipes according to claim 4, characterized in that: The guide assembly includes multiple reciprocating blocks (25). The inner wall of the through hole (12) is provided with multiple reciprocating grooves (24) at equal intervals along the circumferential direction. The multiple reciprocating blocks (25) are slidably and sealed between the inner walls of the reciprocating grooves (24). One side of each of the multiple reciprocating blocks (25) is provided with a through-hole (26) extending to the bottom. One side of each of the multiple reciprocating blocks (25) is provided with a graphite copper sheet (27). One side of each of the multiple graphite copper sheets (27) is arc-shaped, and the other side is correspondingly engaged inside the through-hole (26).

6. An extrusion apparatus for producing polypropylene cable protection pipes according to claim 5, characterized in that: The outer surface of the mold core (10) is provided with a plurality of storage grooves (15) at equal intervals along the circumferential direction. One end of each of the storage grooves (15) is located inside the conical surface of the inner cavity (8). The top surface of each of the storage grooves (15) is provided with a recessed cavity (21). The bottom surface of each of the storage grooves (15) is connected to one end of the discharge port (37). The inner walls of each of the storage grooves (15) are provided with sliding seals and slide plates (16). One side of each of the slide plates (16) is provided with a bent flow channel (17).

7. An extrusion apparatus for producing polypropylene cable protection pipes according to claim 6, characterized in that: One end of each of the multiple bent flow channels (17) extends to the bottom of the slide plate (16) and is opposite to the discharge port (37). A push rod (23) is fixed on one side of each of the multiple slide plates (16). One end of each of the multiple push rods (23) slides through the reciprocating groove (24) and is fixed on the reciprocating block (25). A spring plate (22) is fixed on one side of the inner wall of each of the multiple recessed cavities (21). One end of each of the multiple spring plates (22) is correspondingly engaged on the outer surface of the slide plate (16).

8. An extrusion apparatus for producing polypropylene cable protection pipes according to claim 4, characterized in that: The sorting device includes an annular filter plate (30), an annular sealing sleeve (31) is fixed on the inner side of the annular filter plate (30), the annular sealing sleeve (31) is sealed and fitted on the bottom of the conical guide cylinder (14), two annular sleeves (32) are provided on the inner side of the annular sealing sleeve (31), the top of the annular filter plate (30) is close to the edge and is in contact with the bottom of the gasket (20), a rotating ring (33) is rotatably provided on the bottom of the annular filter plate (30) near the inner side, a plurality of arc-shaped openings (35) are equidistantly provided on the bottom of the rotating ring (33) along the circumferential direction, a plurality of arc-shaped levers (34) are fixed equidistantly on the outer surface of the rotating ring (33) along the circumferential direction, and one side of each of the plurality of arc-shaped levers (34) slides and fits against the outer surface of the annular filter plate (30).

9. An extrusion apparatus for producing polypropylene cable protection pipes according to claim 8, characterized in that: The feedback assembly includes two sensing plates (38). The inner walls of both sides of the cylindrical groove (11) are provided with side cavities (36) below the bottom of the annular filter plate (30). The top surface of the two side cavities (36) is provided with a side flow channel (18) that extends to the inside of the discharge port (37). The two sensing plates (38) are correspondingly and slidably sealed between the inner walls of the side cavities (36). A guide ring (19) is provided between the inner walls of the cylindrical groove (11) below the bottom of the side cavity (36). The top of the guide ring (19) is arc-shaped and located at the bottom edge of the annular filter plate (30). A heating resistor (13) is provided inside the mold core (10).

10. An extrusion apparatus for producing polypropylene cable protection pipes according to claim 9, characterized in that: The mold core (10) has adjustment cavities (39) on both sides. Push plates (42) are slidably arranged between the inner walls of the two adjustment cavities (39) near one edge. Adjustment bolts (29) are rotatably arranged on one side of the two push plates (42). One end of the two adjustment bolts (29) penetrates to the outer surface of the mold core (10). Sliding plates (41) are slidably arranged between the inner walls of the two adjustment cavities (39) near the other edge. A thin wire spring (43) is fixed between one side of the two sliding plates (41) and the other side of the push plate (42). A guide rod (40) is fixed on the other side of the two sliding plates (41). One end of the two guide rods (40) slides through into the side cavity (36) and is fixed to one side of the sensing plate (38).

Images