High-speed extrusion molding equipment and process for thermoplastic insulating layer

Abstract

The invention discloses thermoplastic insulating layer high-speed extrusion molding equipment and a thermoplastic insulating layer high-speed extrusion molding process, and belongs to the technical field of cable processing, the thermoplastic insulating layer high-speed extrusion molding equipment comprises a supporting seat, a gear driving mechanism, a control cabinet and an extrusion assembly are mounted on the supporting seat, the gear driving mechanism is in transmission connection with the extrusion assembly, and a die head is mounted at the left end of the extrusion assembly; four extension frames are mounted outside the die head; according to the invention, the supporting cylinder, the bearing, the elastic assembly, the air storage cylinder, the extrusion plate and the communication air pipe are adopted, scratch is easily caused by stress concentration, closed gas is used as a force transmission medium, rigid support is converted into flexible support, and the uniformity and compressibility of air pressure enable the supporting cylinder to form a layer of'air cushion 'effect when the supporting cylinder is in contact with a cable, so that the cable can be protected; high-frequency vibration and instantaneous impact are effectively absorbed and buffered, and direct scraping or crushing of rigid components to the surface of the insulating layer in a fragile and semi-molten state is avoided, so that the integrity and smoothness of the surface of the insulating layer are ensured.

Description

Technical Field

[0001] This invention belongs to the field of cable processing technology, and in particular relates to high-speed extrusion molding equipment and process for thermoplastic insulation layers. Background Technology

[0002] Cable insulation layers are often made of thermoplastic materials, which are characterized by: being able to melt and flow at high temperatures, making them easy to extrude; and solidifying after cooling to form a stable insulation layer. Common materials include polyvinyl chloride (PVC), cross-linked polyethylene (XLPE), polypropylene (PP), and polyethylene (PE).

[0003] In high-speed extrusion molding equipment, the thermoplastic insulation layer needs to transition from a high-temperature plasticized state to a cooled and shaped state in a very short time to ensure that the cable surface is smooth, round, and of uniform thickness.

[0004] In the field of wire and cable manufacturing, high-speed extrusion molding of thermoplastic insulation layers is a key technology for improving production efficiency. In this process, after the molten insulation material is extruded through the die of the extruder head, it must immediately enter a cooling and shaping water tank for rapid cooling in order to accurately solidify and stabilize the outer diameter of the cable.

[0005] However, in the pursuit of higher production speeds (i.e., high-speed extrusion), existing technologies face two intertwined technical bottlenecks that severely restrict the improvement of product quality: First, there's the issue of "thermal shock" during the cooling and shaping process. Under high-speed extrusion conditions, the insulation layer is still at extremely high temperatures when it leaves the die, its surface is in a viscous or semi-molten state, and the material strength is extremely low. If it is directly immersed in a water tank or subjected to strong water flow at this time, this severe "thermal shock" will cause the surface of the insulation layer to harden instantly, while the interior remains in a high-temperature molten state. This huge temperature gradient and difference in curing rate between the inside and outside will induce severe internal stress, leading to uneven material shrinkage. Macroscopically, this directly manifests as fatal defects such as ellipticization of the cable's outer diameter, insulation layer eccentricity, and thickness fluctuations, greatly affecting the cable's electrical performance and mechanical strength.

[0006] Second, there is the problem of "rigid interference" in the guiding and supporting links. To ensure the straightness of the cable during the cooling process, existing equipment generally uses fixed guide wheels or sizing sleeves at the inlet of the cooling water tank for mechanical guidance. However, this rigid guiding structure has inherent defects: First, it cannot adapt to the slight vibrations or deviations of the cable caused by tension, vibration, and other factors during high-speed movement. When the cable makes misaligned contact with the rigid component, it not only fails to effectively correct the deviation but also exacerbates local stress concentration due to the "hard-on-hard" contact, easily causing physical damage such as scratches and indentations on the soft insulation surface. Second, this forced mechanical constraint interferes with the natural contraction of the cable during the cooling process, further amplifying the ellipticization and eccentricity problems. In the most severe cases, it may even directly damage the surface integrity of the newly formed, not yet fully cured insulation layer, leading to product scrap.

[0007] Based on this, the present invention designs a high-speed extrusion molding equipment and process for thermoplastic insulation layers to solve the above problems. Summary of the Invention

[0008] The purpose of this invention is to provide a high-speed extrusion molding equipment and process for thermoplastic insulating layers in order to solve the problems mentioned in the background art.

[0009] To achieve the above objectives, the present invention adopts the following technical solution: A high-speed extrusion molding equipment for thermoplastic insulation layers includes a support base, on which a gear drive mechanism, a control cabinet, and an extrusion assembly are mounted. The gear drive mechanism is connected to the extrusion assembly. A die head is mounted on the left end of the extrusion assembly. Four extension frames are mounted outside the die head. An intermediate rod is fixedly connected to the extension frames. An elastic connecting mechanism is fixedly connected to the end of the intermediate rod. A heat-conducting shielding mechanism is mounted outside the elastic connecting mechanism. Two bearings are mounted outside the heat-conducting shielding mechanism. A rolling support cylinder is rotatably connected to the bearings. An air vent is opened on the outside of the rolling support cylinder. The heat-conducting shielding mechanism is rotatably connected to the inner wall of the rolling support cylinder.

[0010] As a further description of the above technical solution: The control cabinet is electrically connected to the gear drive mechanism. One end of each of the four heat-conducting shielding mechanisms is connected to a first annular pipe, and a drain pipe is connected to the bottom of the first annular pipe. The other end of each of the four heat-conducting shielding mechanisms is connected to a second annular pipe.

[0011] As a further description of the above technical solution: The four elastic connecting mechanisms are connected by a connecting air pipe. A heating component is installed on the support base and is located below the extrusion component. A feeding cylinder is installed on the extrusion component and an installation base is installed below the support base.

[0012] As a further description of the above technical solution: All four rolling support cylinders are arc-shaped, and the four rolling support cylinders are combined to form a ring, which is used to support the tubular insulation layer.

[0013] As a further description of the above technical solution: The elastic connection mechanism includes an air storage cylinder, which is fixedly connected to the end of the intermediate rod. A compression plate is slidably connected inside the air storage cylinder, and a moving rod is fixedly connected to the side of the compression plate. The moving rod passes through and is slidably connected to the side of the air storage cylinder.

[0014] As a further description of the above technical solution: The movable rod is fixedly connected to a support frame at one end outside the gas storage cylinder. The support frame is fixedly connected to the heat conduction shielding mechanism. All four gas storage cylinders are connected to the connecting gas pipe. An elastic component is provided on the outer sleeve of the movable rod. The elastic component is fixedly connected to the outside of the extrusion plate and to the inner wall of the gas storage cylinder.

[0015] As a further description of the above technical solution: The heat-conducting shielding mechanism includes a shielding frame with a notch on its side. The notch is located on the left side and is used to connect the shielding frame with the air outlet. The shielding frame is hollow.

[0016] As a further description of the above technical solution: The shielding frame is equipped with extension pipes near both bearing surfaces. One extension pipe is connected to a water outlet pipe, which is connected to the outside of the first annular pipe. The other extension pipe is connected to a water inlet pipe, which is connected to the outside of the second annular pipe.

[0017] As a further description of the above technical solution: A connecting valve is installed on the outside of the water inlet pipe, and an air inlet pipe is provided through the side of the extension pipe connected to the water inlet pipe. The air inlet pipe passes through the shielding frame and enters the rolling support cylinder. The air inlet pipe is used to inject gas into the rolling support cylinder.

[0018] A high-speed extrusion molding process for thermoplastic insulating layers, the process comprising the following steps: The gear drive mechanism is controlled by the control cabinet, and the raw material of the thermoplastic insulation layer is injected into the extrusion assembly through the feeding cylinder. The extrusion assembly melts the raw material and extrudes a tubular insulation layer through the die. The tubular insulation layer passes through four rolling support cylinders, which cooperate to support the tubular insulation layer. At the same time, warm water is injected into the shielding frame through the second annular tube. The heat of the warm water is transferred to the surface of the rolling support cylinders through the shielding frame. The insulation layer extruded from the die has a high temperature. By using rolling support cylinders with a certain temperature to support the insulation layer, the heat transfer will prevent the insulation layer from cooling down quickly, avoiding significant deformation and surface roughness due to large temperature differences. When the insulation layer shakes during extrusion and cooling, it will compress the rolling support cylinder to move. The rolling support cylinder is controlled by the support frame to move the moving rod and the extrusion plate. As the extrusion plate moves, it compresses the gas in the gas storage cylinder and makes it flow through the connecting air pipe, increasing the gas in the gas storage cylinders in other positions. The four rolling support cylinders form a dynamic and stable combination to support the insulation layer and reduce the probability of the insulation layer becoming deformed and elliptical. After the rolling support cylinder rotates to the position where the air outlet and the notch are aligned, the gas in the air outlet pipe flows out through the notch and the air outlet. After passing through the warm water in the shielding frame, the gas is blown out, which realizes the slow cooling of the insulation layer by blowing air. Moreover, the gas passing through the notch will not be blown forcefully onto the surface of the insulation layer. The flowing gas will increase the stable and uniform cooling treatment of the insulation layer, making the cooling process smoother.

[0019] In summary, due to the adoption of the above technical solution, the beneficial effects of the present invention are: 1. In this invention, a support cylinder, bearings, elastic components, an air storage cylinder, an extrusion plate, and a connecting air pipe are used. When the cable experiences radial swaying during high-speed extrusion and cooling, the system can respond instantly: the support cylinder in any direction is displaced under pressure, and the displacement is converted into a pressure signal through mechanical linkage. This signal is then transmitted in real time to the opposite support unit via the connecting air pipe, driving it to extend synchronously to compensate. This dynamic balance mechanism of "one increasing while the other decreases" ensures that the supporting force on the cable is always balanced and follows its deformation, fundamentally weakening the radial force that causes defects such as ellipticity and eccentricity. This invention significantly improves the geometric accuracy of the insulation layer. Traditional rigid guide devices have a "hard contact" with the cable, which is prone to scratches due to stress concentration. This invention uses a closed gas as the force transmission medium, transforming rigid support into flexible support. The uniformity and compressibility of the gas pressure allow the support cylinder to form an "air cushion" effect when in contact with the cable. This not only effectively absorbs and buffers high-frequency vibrations and instantaneous impacts, but also avoids direct scratching or crushing of the fragile, semi-molten insulation layer surface by rigid components, thereby ensuring the integrity and smoothness of the insulation layer surface.

[0020] 2. In this invention, a shielding frame, a rolling support cylinder, a water inlet pipe, a water outlet pipe, a first annular pipe, and a second annular pipe are used. Through an internal water circulation system, the surface temperature of the rolling support cylinder is actively raised and stabilized within a preset temperature range that matches the newly extruded insulation layer. This "isothermal" or "near-isothermal" contact method fundamentally eliminates the cold shock effect and avoids stress concentration, micro-cracks, and roughening of the material surface caused by sudden cooling. Through the continuous and gentle heat transfer of the temperature-controlled support cylinder, the cooling rate of the insulation layer in the initial shaping stage is effectively slowed down. This provides more time for the molecular chains of the thermoplastic material to relax and rearrange, which is conducive to the formation of a more uniform and finer crystalline structure. The optimized internal structure not only improves the mechanical properties of the insulation layer but also fundamentally ensures its long-term dimensional stability.

[0021] 3. In this invention, an air-liquid synergistic temperature-controlled cooling system is introduced by employing an air inlet pipe, an air outlet, a notch, and a rolling support cylinder. This achieves efficient, uniform, and stress-free cooling of the insulation layer. Specifically, the system introduces gas through the air inlet pipe and preheats it using circulating warm water within the shielding frame, forming a hot airflow with a minimal temperature difference from the insulation layer surface. This hot airflow passes through a notch and air outlet with a specific structure, forming a uniform laminar air curtain flowing along the axial direction of the insulation layer. Because the airflow is preheated, the thermal shock caused by traditional cold air cooling is completely eliminated, avoiding defects such as stress concentration, microcracks, and surface roughness caused by sudden surface cooling. The parallel laminar airflow can uniformly sweep across the entire circumferential surface of the insulation layer, ensuring the synchronicity and consistency of heat dissipation. This effectively overcomes the problems of ellipticization and eccentricity caused by uneven water flow in traditional water tank cooling, ensuring the accuracy and stability of the cable's geometric dimensions. The flowing air film significantly enhances the convective heat transfer coefficient, greatly improving the overall cooling efficiency while ensuring cooling uniformity, achieving a perfect unity of high efficiency and high quality. Attached Figure Description

[0022] Figure 1 This is a three-dimensional structural schematic diagram of the high-speed extrusion molding equipment and process for thermoplastic insulating layers proposed in this invention; Figure 2 This is a side-view three-dimensional structural diagram of the high-speed extrusion molding equipment and process for thermoplastic insulating layers proposed in this invention; Figure 3 This is a three-dimensional structural diagram of the extension frame of the high-speed extrusion molding equipment and process for thermoplastic insulation layers proposed in this invention; Figure 4 This is a side-view perspective three-dimensional structural diagram of the extension frame of the high-speed extrusion molding equipment and process for thermoplastic insulating layers proposed in this invention; Figure 5 This is a three-dimensional structural diagram of the rolling support cylinder for the high-speed extrusion molding equipment and process of the thermoplastic insulation layer proposed in this invention; Figure 6 This is a three-dimensional cross-sectional view of the rolling support cylinder structure of the high-speed extrusion molding equipment and process for thermoplastic insulation layers proposed in this invention. Figure 7 This is a three-dimensional cross-sectional view of the elastic connection mechanism of the high-speed extrusion molding equipment and process for thermoplastic insulation layers proposed in this invention. Figure 8 This is a three-dimensional structural diagram of the heat-conducting shielding mechanism in the high-speed extrusion molding equipment and process for thermoplastic insulating layers proposed in this invention.

[0023] Legend: 1. Support base; 2. Mounting base; 3. Gear drive mechanism; 4. Control cabinet; 5. Extrusion assembly; 6. Feeding cylinder; 7. Heating assembly; 8. Die head; 9. Extension frame; 10. Intermediate rod; 11. Elastic connection mechanism; 111. Air storage cylinder; 112. Extrusion plate; 113. Moving rod; 114. Elastic assembly; 115. Support frame; 12. Bearing; 13. Rolling support cylinder; 14. Air outlet; 15. Shielding heat conduction mechanism; 151. Shielding frame; 152. Notch; 153. Extension tube; 154. Water outlet pipe; 155. Water inlet pipe; 156. Connecting valve; 157. Air inlet pipe; 16. Connecting air pipe; 17. First annular pipe; 18. Drain pipe; 19. Second annular pipe. Detailed Implementation

[0024] 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.

[0025] Please see the appendix Figure 1 -Appendix Figure 8 This invention provides a technical solution: a high-speed extrusion molding equipment for thermoplastic insulation layers, including a support base 1, on which a gear drive mechanism 3, a control cabinet 4, and an extrusion assembly 5 are mounted. The gear drive mechanism 3 is connected to the extrusion assembly 5 in a transmission manner. A die head 8 is mounted on the left end of the extrusion assembly 5. Four extension frames 9 are mounted outside the die head 8. An intermediate rod 10 is fixedly connected to the extension frames 9. An elastic connecting mechanism 11 is fixedly connected to the end of the intermediate rod 10. A heat-conducting shielding mechanism 15 is mounted outside the elastic connecting mechanism 11. Two bearings 12 are mounted outside the heat-conducting shielding mechanism 15. A rolling support cylinder 13 is rotatably connected to the bearings 12. An air outlet 14 is opened on the outside of the rolling support cylinder 13. The heat-conducting shielding mechanism 15 is rotatably connected to the inner wall of the rolling support cylinder 13.

[0026] Specifically, such as Figures 1-4As shown, the control cabinet 4 is electrically connected to the gear drive mechanism 3. One end of the four shielding heat conduction mechanisms 15 is connected to the first annular pipe 17, and the lower end of the first annular pipe 17 is connected to the drain pipe 18. The other end of the four shielding heat conduction mechanisms 15 is connected to the second annular pipe 19.

[0027] Specifically, such as Figures 3-4 As shown, the four elastic connecting mechanisms 11 are connected by a connecting air pipe 16. A heating component 7 is installed on the support base 1. The heating component 7 is located below the extrusion component 5. A feeding cylinder 6 is installed on the extrusion component 5. An installation base 2 is installed below the support base 1.

[0028] Specifically, such as Figures 1-3 As shown, the four rolling support cylinders 13 are all arc-shaped, and the four rolling support cylinders 13 are combined to form a ring, which is used to support the tubular insulation layer.

[0029] Specifically, such as Figures 3-6 As shown, the elastic connection mechanism 11 includes an air storage cylinder 111, which is fixedly connected to the end of the intermediate rod 10. A compression plate 112 is slidably connected inside the air storage cylinder 111. A moving rod 113 is fixedly connected to the side of the compression plate 112, and the moving rod 113 passes through and is slidably connected to the side of the air storage cylinder 111.

[0030] The moving rod 113 is fixedly connected to a support frame 115 at one end outside the gas storage cylinder 111. The support frame 115 is fixedly connected to the heat shielding and heat conduction mechanism 15. All four gas storage cylinders 111 are connected to the connecting gas pipe. The moving rod 113 is covered with an elastic component 114. The elastic component 114 is fixedly connected to the outside of the extrusion plate 112 and to the inner wall of the gas storage cylinder 111.

[0031] The four rolling support cylinders 13 cooperate to support the tubular insulation layer. The insulation layer will squeeze the rolling support cylinders 13 to move. The rolling support cylinders 13 control the movement of the moving rod 113 and the extrusion plate 112 through the support frame 115. While the extrusion plate 112 moves, it will squeeze the gas in the gas storage cylinder 111 to flow through the connecting air pipe 16, so that the gas in the gas storage cylinders 111 in other positions increases. The four rolling support cylinders 13 present a dynamic and stable combination to support the insulation layer.

[0032] Specifically, such as Figures 3-4 and Figures 7-8 As shown, the heat conduction shielding mechanism 15 includes a shielding frame 151. A notch 152 is provided on the side of the shielding frame 151. The notch 152 is located on the left side and is used to connect the shielding frame 151 with the air outlet 14. The shielding frame 151 is hollow.

[0033] The shielding frame 151 is equipped with extension pipes 153 near the two bearings 12. One of the extension pipes 153 is connected to a water outlet pipe 154, which is connected to the outside of the first annular pipe 17. The other extension pipe 153 is connected to a water inlet pipe 155, which is connected to the outside of the second annular pipe 19.

[0034] A connecting valve 156 is installed on the outside of the water inlet pipe 155. An air inlet pipe 157 is provided through the side of the extension pipe 153 that is connected to the water inlet pipe 155. The air inlet pipe 157 passes through the shielding frame 151 and enters the rolling support cylinder 13. The air inlet pipe 157 is used to inject gas into the rolling support cylinder 13.

[0035] The second annular tube 19 injects warm water into the shielding frame 151. The heat of the warm water is transferred to the surface of the rolling support cylinder 13 through the shielding frame 151. The insulation layer extruded from the die head 8 has a high temperature. While the insulation layer is supported by the rolling support cylinder 13 with a certain temperature, the heat transfer will prevent the insulation layer from cooling down quickly. At the same time, the shielding frame 151 prevents gas from being discharged through the vent hole 14 attached to the surface of the insulation layer, and prevents gas from directly impacting the surface of the insulation layer.

[0036] The high-speed extrusion molding process for thermoplastic insulation layers includes the following steps: The gear drive mechanism 3 is controlled by the control cabinet 4, and the raw material of the thermoplastic insulation layer is injected into the extrusion assembly 5 through the feeding cylinder 6. After the extrusion assembly 5 melts the raw material, it is extruded into a tubular insulation layer through the die head 8. The tubular insulation layer passes through four rolling support cylinders 13. The four rolling support cylinders 13 cooperate to support the tubular insulation layer. At the same time, warm water is injected into the shielding frame 151 through the second annular tube 19. The heat of the warm water is transferred to the surface of the rolling support cylinders 13 through the shielding frame 151. The insulation layer extruded from the die head 8 has a high temperature. While the insulation layer is supported by the rolling support cylinders 13 with a certain temperature, the heat transfer will prevent the insulation layer from cooling down quickly, avoiding obvious deformation and surface roughness due to large temperature difference. When the insulation layer shakes during the extrusion and cooling process, it will squeeze the rolling support cylinder 13 to move. The rolling support cylinder 13 controls the movement of the moving rod 113 and the extrusion plate 112 through the support frame 115. While the extrusion plate 112 moves, it squeezes the gas in the gas storage cylinder 111 to flow through the connecting air pipe 16, which increases the gas in the gas storage cylinders 111 in other positions. The four rolling support cylinders 13 form a dynamic and stable combination to support the insulation layer and reduce the probability of the insulation layer becoming deformed and elliptical. After the rolling support cylinder 13 rotates to the position where the air outlet 14 corresponds to the notch 152, the gas in the air outlet pipe flows out through the notch 152 and the air outlet 14. The gas is blown out after being heated by the warm water in the shielding frame 151, which realizes the slow cooling of the insulation layer by blowing air. Moreover, the gas passing through the notch 152 will not be blown forcefully onto the surface of the insulation layer. The flowing gas increases the stable and uniform cooling treatment of the insulation layer, and the cooling process is smoother.

[0037] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A high-speed extrusion molding equipment for thermoplastic insulating layers, comprising a support base (1), characterized in that, The support base (1) is equipped with a gear drive mechanism (3), a control cabinet (4) and an extrusion assembly (5). The gear drive mechanism (3) is connected to the extrusion assembly (5) in a transmission connection. A die head (8) is installed on the left end of the extrusion assembly (5). Four extension frames (9) are installed on the outside of the die head (8). An intermediate rod (10) is fixedly connected to the outside of the extension frame (9). An elastic connection mechanism (11) is fixedly connected to the end of the intermediate rod (10). A heat shielding and heat conduction mechanism (15) is installed on the outside of the elastic connection mechanism (11). Two bearings (12) are installed on the outside of the heat shielding and heat conduction mechanism (15). A rolling support cylinder (13) is rotatably connected to the outside of the bearings (12). An air outlet (14) is opened on the outside of the rolling support cylinder (13). The heat shielding and heat conduction mechanism (15) is rotatably connected to the inner wall of the rolling support cylinder (13).

2. The high-speed extrusion molding equipment for thermoplastic insulating layers according to claim 1, characterized in that, The control cabinet (4) is electrically connected to the gear drive mechanism (3). One end of the four shielding heat conduction mechanisms (15) is connected to the first annular pipe (17), and the first annular pipe (17) is connected to the drain pipe (18). The other end of the four shielding heat conduction mechanisms (15) is connected to the second annular pipe (19).

3. The high-speed extrusion molding equipment for thermoplastic insulating layers according to claim 2, characterized in that, A connecting air pipe (16) is connected between the four elastic connecting mechanisms (11). A heating component (7) is installed on the support base (1). The heating component (7) is located below the extrusion component (5). A feeding cylinder (6) is installed on the extrusion component (5). An installation base (2) is installed below the support base (1).

4. The high-speed extrusion molding equipment for thermoplastic insulating layers according to claim 3, characterized in that, All four of the rolling support cylinders (13) are arc-shaped, and the four rolling support cylinders (13) are combined to form a ring and are used to support the tubular insulation layer.

5. The high-speed extrusion molding equipment for thermoplastic insulating layers according to claim 4, characterized in that, The elastic connection mechanism (11) includes an air storage cylinder (111), which is fixedly connected to the end of the intermediate rod (10). An extrusion plate (112) is slidably connected inside the air storage cylinder (111), and a moving rod (113) is fixedly connected to the side of the extrusion plate (112). The moving rod (113) passes through and is slidably connected to the side of the air storage cylinder (111).

6. The high-speed extrusion molding equipment for thermoplastic insulating layers according to claim 5, characterized in that, The moving rod (113) is fixedly connected to a support frame (115) at one end outside the gas storage cylinder (111). The support frame (115) is fixedly connected to the heat conduction shielding mechanism (15). All four gas storage cylinders (111) are connected to the connecting gas pipe. The moving rod (113) is covered with an elastic component (114). The elastic component (114) is fixedly connected to the outside of the extrusion plate (112) and to the inner wall of the gas storage cylinder (111).

7. The high-speed extrusion molding equipment for thermoplastic insulating layers according to claim 6, characterized in that, The heat-conducting shielding mechanism (15) includes a shielding frame (151), and a notch (152) is provided on the side of the shielding frame (151). The notch (152) is located on the left side and is used to connect the shielding frame (151) with the air outlet (14). The shielding frame (151) is hollow.

8. The high-speed extrusion molding equipment for thermoplastic insulating layers according to claim 7, characterized in that, The shielding frame (151) is equipped with extension pipes (153) near the two bearings (12). One of the extension pipes (153) is connected to a water outlet pipe (154), which is connected to the outside of the first annular pipe (17). The other extension pipe (153) is connected to a water inlet pipe (155), which is connected to the outside of the second annular pipe (19).

9. The high-speed extrusion molding equipment for thermoplastic insulating layers according to claim 8, characterized in that, A connecting valve (156) is installed outside the water inlet pipe (155). An air inlet pipe (157) is provided through the side of the extension pipe (153) that is connected to the water inlet pipe (155). The air inlet pipe (157) passes through the shielding frame (151) and enters the rolling support cylinder (13). The air inlet pipe (157) is used to inject gas into the rolling support cylinder (13).

10. A high-speed extrusion molding process for thermoplastic insulating layers, wherein the high-speed extrusion molding equipment for thermoplastic insulating layers according to any one of claims 1-9 is characterized in that, The process includes the following steps: The gear drive mechanism (3) is controlled by the control cabinet (4), and the raw material of the thermoplastic insulation layer is injected into the extrusion assembly (5) through the feeding cylinder (6). After the extrusion assembly (5) melts the raw material, the tubular insulation layer is extruded through the die (8). The tubular insulation layer passes through four rolling support cylinders (13). The four rolling support cylinders (13) cooperate to support the tubular insulation layer. At the same time, the second annular tube (19) injects warm water into the shielding frame (151). The heat of the warm water is transferred to the surface of the rolling support cylinder (13) through the shielding frame (151). The insulation layer extruded from the die (8) has a high temperature. While the rolling support cylinder (13) with a certain temperature is used to support the insulation layer, the heat transfer will prevent the insulation layer from cooling down quickly, thus avoiding significant deformation and surface roughness due to large temperature differences. When the insulation layer vibrates during the extrusion and cooling process, it will compress the rolling support cylinder (13) to move. The rolling support cylinder (13) controls the movement of the moving rod (113) and the extrusion plate (112) through the support frame (115). While the extrusion plate (112) moves, it will compress the gas in the gas storage cylinder (111) and make it flow through the connecting gas pipe (16), so that the gas in the gas storage cylinders (111) in other positions increases. The four rolling support cylinders (13) present a dynamic and stable combination, which realizes the support of the insulation layer and reduces the insulation. The probability of the layer becoming deformed ellipse is reduced. After the rolling support cylinder (13) rotates to the position of the air outlet (14) and the notch (152), the gas in the air outlet pipe flows out through the notch (152) and the air outlet (14). After the gas is heated by the warm water in the shielding frame (151), it is blown out to achieve slow cooling of the insulation layer. Moreover, the gas passing through the notch (152) will not be blown forcefully onto the surface of the insulation layer. The flowing gas will increase the stable and uniform cooling treatment of the insulation layer, and the cooling process will be smoother.

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