HDPE silicon core pipe extrusion cooling device

Abstract

The present application relates to the technical field of silicon core pipe extrusion cooling, in particular to a HDPE silicon core pipe extrusion cooling device, which comprises a rack, a cooling runner for shaping the silicon core pipe is arranged on the rack, and a limiting mechanism for limiting the silicon core pipe is arranged on the cooling runner at equal intervals along the left-right direction, the height of each hard pipe is accurately adjusted by the control assembly, so that the high-temperature soft silicon core pipe passing through the cooling runner is applied with a shaping force by the limiting roller, the force effectively reduces the continuous floating lifting effect of the cooling water on the silicon core pipe, the limiting roller is driven to move radially by the driving assembly, the inner concave arc surfaces of the plurality of limiting rollers are combined to form an enveloping type constraint on the outer wall of the silicon core pipe, effective radial constraint and shaping of the silicon core pipe are realized, the cross-sectional roundness of the silicon core pipe is ensured, the mechanical structure on the pipe wall is maximally reduced, and the cooling uniformity of the silicon core pipe is ensured.

Description

Technical Field

[0001] This invention relates to the field of silicon core tube extrusion cooling technology, specifically an HDPE silicon core tube extrusion cooling device. Background Technology

[0002] In the field of long-distance optical fiber cable laying, HDPE silicon core pipes, due to their inner wall being coated with a permanent solid silicone lubricating layer, can greatly reduce the traction resistance during optical cable laying. They have become the core sheathing pipes for trunk communication networks such as highways and railways. Silicon core pipes are usually manufactured using extrusion molding processes. Among them, the cooling and shaping process after extrusion is the key link that determines its final geometric accuracy, mechanical properties and the curing quality of the inner wall silicone lubricating layer.

[0003] Currently, the industry generally adopts a three-stage cooling process for extruded HDPE silicon core tubes, including vacuum sizing, spray cooling, and immersion cooling, along with corresponding equipment. The typical process is as follows: the silicon core tube first undergoes preliminary cooling and dimensional shaping in a vacuum sizing box, and then passes through a spray cooling section and an immersion cooling water tank in sequence to achieve thorough cooling. However, this general cooling solution reveals significant technical defects when applied to HDPE silicon core tubes with special structures and properties.

[0004] Firstly, because the density of HDPE silicon core tubes is approximately 0.95-0.97 g / cm³, which is less than the density of cooling water (1.0 g / cm³), when the high-temperature softened silicon core tubes enter the immersion cooling section, they are subjected to continuous upward buoyancy. This buoyancy constantly lifts the softened silicon core tubes with low yield strength, easily causing the tube body to sway in the water. This severely damages the straightness and roundness of the formed tubes, resulting in an irreversible bend in the HDPE silicon core tubes on a macroscopic scale. This means that the optical cable needs to frequently overcome additional bending resistance and lateral friction during the laying process, which greatly increases the traction force and may even exceed the bearing limit of the optical cable or traction equipment. Furthermore, the irregular cross-section of the pipe will create stress concentration points, affecting the long-term pressure resistance of the silicon core tubes.

[0005] Therefore, designing a dedicated extrusion cooling device for HDPE silicon core tubes to achieve high-precision geometric shaping and stable shaping of high-temperature soft silicon core tubes, so as to ensure the curing quality of the inner wall silicone functional layer, has become a long-standing and urgent technical problem in this field. Summary of the Invention

[0006] To solve the above-mentioned technical problems, the technical solution adopted by the present invention is: an HDPE silicon core tube extrusion cooling device, including a frame, a cooling channel for shaping the silicon core tube is provided on the frame, and a limiting mechanism for limiting the silicon core tube is provided at equal intervals along the left and right directions on the cooling channel.

[0007] The cooling channel includes several rigid pipes and flexible pipes that are alternately sealed and connected together. The rigid pipes at both ends are sealed and connected to the frame, so that the rigid pipes, flexible pipes and the frame form a continuous water channel. The frame is equipped with a control component to control the height of each rigid pipe.

[0008] The limiting mechanism includes limiting rollers arranged circumferentially at equal intervals inside the rigid tube via a driving component. The limiting rollers have a hollow structure. The driving component is equipped with a cooling component that allows cooling water to flow through the inside of the limiting rollers. The outer side of the limiting rollers has an inwardly concave arc-shaped surface, and the curvature of the arc-shaped surface of the limiting rollers gradually increases along the moving direction of the silicon core tube.

[0009] During cooling, the limiting rollers on the same rigid tube combine and use their arc-shaped surfaces to limit and shape the silicon core tube with a low contact area. The rigid tubes, which are arranged from the middle to both sides, are shaped by the limiting rollers.

[0010] By limiting, shaping, and fixing the silicon core tube, a high geometrically precise continuous cooling operation of the silicon core tube can be carried out.

[0011] Preferably, a water inlet pipe is welded and connected to the upper left side of the frame, and water collection tanks for collecting leaked cooling water are welded to both ends of the frame.

[0012] Preferably, the control component includes a plurality of hydraulic cylinders fixedly installed on the lower side of the frame and corresponding one-to-one with the rigid pipes, wherein the telescopic section of the hydraulic cylinder is fixedly connected to the corresponding rigid pipe.

[0013] Preferably, the limiting roller has several sets of grooves evenly spaced along its circumference on its arc surface. Each set consists of several grooves arranged on the arc surface along the axial direction of the limiting roller, and adjacent sets of grooves are staggered.

[0014] Preferably, the grooves in the same group carry cooling water and contact the wall of the silicon core tube, and the arc-shaped surface between two adjacent grooves in the group abuts against the wall of the silicon core tube.

[0015] Preferably, the drive assembly includes a plurality of roller frames arranged at equal intervals along the circumference of the rigid tube, the roller frames being rotatably connected to the limiting rollers, and a slide frame welded to the outside of the roller frames and slidingly inserted into the rigid tube along the radial direction of the rigid tube.

[0016] Preferably, a second hydraulic cylinder is fixedly installed on the slide, and the telescopic section of the second hydraulic cylinder is fixedly connected to the rigid pipe.

[0017] Preferably, the cooling assembly includes a blade shaft that is rotatably and sealed on the carriage, with the middle part of the blade shaft located in a cavity inside the corresponding limiting roller.

[0018] Preferably, a plurality of blades are arranged along the axial direction on the blade shaft, such that the rotating blade shaft causes cooling water to flow in the cavity inside the limiting roller.

[0019] Preferably, a motor is fixedly mounted on the carriage, and the output shaft of the motor is connected to the corresponding blade shaft through a belt drive structure.

[0020] The beneficial effects of the present invention are as follows: First, the present invention uses a control component to precisely adjust the height of each rigid tube, so that the rigid tubes present a spatial layout that gradually increases from the middle of the frame to both sides. This layout allows the high-temperature soft silicon core tube passing through the cooling channel to be subjected to a shaping force by the limiting roller. This force effectively reduces the continuous upward lifting effect of the cooling water on the silicon core tube, and significantly improves the straightness of the silicon core tube after cooling and shaping.

[0021] Second, the present invention uses a driving component to drive the radial movement of the limiting rollers, so that the concave arc surfaces of multiple limiting rollers combine to form an enveloping constraint on the outer wall of the silicon core tube. This design uses multiple discrete small-area arc contact lines to contact the silicon core tube, which effectively constrains and shapes the silicon core tube and ensures its cross-sectional roundness, while minimizing the obstruction of the tube wall by the mechanical structure and ensuring the uniformity of cooling of the silicon core tube.

[0022] Third, the present invention adopts a design in which the curvature of the limiting roller arc surface gradually increases along the moving direction of the silicon core tube. This design can adapt to the radial diameter shrinkage of the silicon core tube in the cooling channel due to the gradual decrease in temperature. It ensures that the limiting roller arc surface at each position can maintain the best fit with the silicon core tube at different shrinkage stages throughout the entire cooling process from high temperature to low temperature, thereby providing continuous, stable and precise geometric constraints, and further ensuring the dimensional consistency and roundness accuracy of the final product.

[0023] Fourth, the present invention employs a groove on the limiting roller in conjunction with a cooling component, which promotes the cooling of the silicon core tube by cooling water in the contact area between the limiting roller and the silicon core tube. At the same time, the cooling component forces the circulating cooling water to flow inside the limiting roller. The two work together to ensure that the temperature of the limiting roller body is synchronized with the temperature of the surrounding cooling water in real time. Thus, while achieving low contact area and high precision mechanical limiting, it further ensures the uniformity of cooling of the silicon core tube. Attached Figure Description

[0024] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0025] Figure 1 This is a schematic diagram of the overall structure of the present invention when cooling the silicon core tube.

[0026] Figure 2 This is a partial cross-sectional view of the present invention.

[0027] Figure 3 This is a left view of the rigid tube, groove, roller frame, and slide in this invention.

[0028] Figure 4This is a cross-sectional view of the roller frame, slide, limiting roller and blade shaft in this invention.

[0029] Figure 5 This is a schematic diagram of the limiting roller in this invention.

[0030] In the diagram: 1. Frame; 2. Cooling channel; 3. Limiting mechanism; 11. Water inlet pipe; 12. Water collection tank; 21. Rigid pipe; 22. Flexible hose; 23. Control component; 31. Limiting roller; 32. Cooling component; 33. Drive component; 231. Hydraulic cylinder one; 331. Roller frame; 332. Slide carriage; 333. Hydraulic cylinder two; 311. Groove; 321. Paddle shaft; 322. Motor. Detailed Implementation

[0031] The embodiments of the present invention are described in detail below. The embodiments described below are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention. Where specific techniques or conditions are not specified in the embodiments, they shall be performed in accordance with the techniques or conditions described in the literature in the art or in accordance with the product manual.

[0032] See Figure 1 and Figure 2 An HDPE silicon core tube extrusion cooling device includes a frame 1, a cooling channel 2 for shaping the silicon core tube is provided on the frame 1, and a limiting mechanism 3 for limiting the silicon core tube is provided at equal intervals along the left and right directions on the cooling channel 2. A water inlet pipe 11 is welded to and connected to the upper left side of the frame 1, and a water collection tank 12 is welded to and connected to the upper right side of the frame 1.

[0033] Before cooling, cooling water is pumped into the inlet pipe 11 by a water pump, so that the cooling water enters the cooling channel 2. When the cooling water level in the cooling channel 2 rises to the middle of the frame 1, the cooling water flows out from the pipe openings at both ends of the frame 1 into the corresponding water collection tank 12. At this time, the outflow speed of the cooling water is less than the inflow speed of the cooling water, so that the cooling water level can rise quickly to fill the cooling channel 2. At the same time, the cooling water in the water collection tank 12 is guided into the existing cooling device, so that the cooling water is cooled again and then pumped into the inlet pipe 11, thereby making the cooling water in the cooling channel 2 circulate.

[0034] During cooling, the silicon core tube enters from the pipe opening at the left end of the frame 1. Then, the silicon core tube moves continuously to the left along the cooling channel 2 and is immersed in the cooling water in the cooling channel 2 for cooling. At the same time, the limiting mechanism 3 limits and shapes the silicon core tube to ensure the roundness of the silicon core tube after cooling. The cooling channel 2 also shapes the silicon core tube, reducing the buoyancy of the cooling water on the silicon core tube and ensuring the straightness of the silicon core tube.

[0035] It should be noted that, in this embodiment, several temperature sensors are installed inside the cooling channel 2 (not shown in the figure). The temperature sensors transmit the feedback cooling water temperature to the host computer in real time, so that the host computer can adjust the water pump flow rate in real time according to the feedback temperature data, thereby keeping the cooling water temperature in the cooling channel 2 constant within a certain range.

[0036] Continue reading Figure 1 and Figure 2 The cooling channel 2 includes several rigid pipes 21 and flexible pipes 22 that are alternately sealed and connected together. The rigid pipes 21 at both ends are sealed and connected to the frame 1, so that the rigid pipes 21, flexible pipes 22 and the inner cavity of the frame 1 form a continuous water channel. The frame 1 is equipped with a control component 23 to control the height of each rigid pipe 21. During cooling, the cooling water fills the above water channel, so that the silicon core tube moving through the water channel is completely immersed in the cooling water, thereby immersing the silicon core tube for immersion cooling.

[0037] In this embodiment, the end of the flexible hose 22 is sleeved on the outside of the corresponding rigid pipe 21, and a clamp is provided on the outside of the rigid pipe 21. The clamping force when tightening the clamp securely and sealably connects the end of the flexible hose 22 to the rigid pipe 21. The attached drawings only show the orientation relationship between the rigid pipe 21 and the flexible hose 22, and do not show the specific connection method.

[0038] See Figure 1 , Figure 2 , Figure 3 and Figure 4 The limiting mechanism 3 includes limiting rollers 31 arranged circumferentially and at equal intervals inside the rigid tube 21 via the driving assembly 33. The limiting rollers 31 have a hollow structure. The driving assembly 33 is provided with a cooling assembly 32 that allows cooling water to flow through the inside of the limiting rollers 31. The outer side of the limiting rollers 31 has an inwardly concave arc surface, and the curvature of the arc surface of the limiting rollers 31 gradually increases along the moving direction of the silicon core tube.

[0039] When the silicon core tube moves in the water channel, the drive assembly 33 drives the limiting roller 31 to abut against the circumference of the silicon core tube, so that the arc surface of the limiting roller 31 contacts the silicon core tube with a low area, thereby limiting the silicon core tube by the limiting roller 31, and thus making the position of the silicon core tube corresponding to the limiting roller 31 coaxial with the rigid tube 21 at that time. Furthermore, by the arc surface of the limiting roller 31 abutting against the silicon core tube softened by high temperature, the silicon core tube can also be shaped to ensure the roundness of the silicon core tube.

[0040] By precisely adjusting the height of each rigid tube 21 through the control component 23, the rigid tubes 21 are arranged in a spatial layout that gradually increases in height from the middle of the frame 1 to both sides. The rigid tubes 21 are driven by the drive component 33 and the limiting roller 31 to adjust the height of the silicon core tube. The rigid tubes 21 arranged in the above-mentioned layout cause the high-temperature soft silicon core tube passing through the water channel to be subjected to a shaping force by the limiting roller 31. This force effectively reduces the continuous upward lifting effect of the cooling water on the silicon core tube and significantly improves the straightness of the silicon core tube after cooling and shaping. The height of each rigid tube 21 in this embodiment is obtained through repeated experiments by those skilled in the art.

[0041] In this embodiment, the flexible tube 22 is made of a corrosion-resistant and erosion-resistant material, and the length of the flexible tube 22 is slightly greater than the distance between two adjacent rigid tubes 21, so that the two adjacent rigid tubes 21 can be misaligned within 200mm while maintaining a sealed connection. Within this height difference, the middle of the flexible tube 22 will not sag by more than one-third of its own diameter, thereby preventing the inner wall of the flexible tube 22 from contacting the silicon core tube.

[0042] It should be noted that the contact between the arc-shaped surface of the limiting roller 31 and the outer wall of the silicon core tube is close to line contact, making the mechanical obstruction of the outer wall of the silicon core tube by the limiting roller 31 negligible. Therefore, the cooling water can uniformly cool the outer wall of the silicon core tube, and the circumferential position of the silicon core tube corresponding to the limiting roller 31 is simultaneously obstructed by the limiting roller 31. This ensures that all positions of the silicon core tube are simultaneously in contact with and blocked by the cooling water, thereby making the contact time between each part of the silicon core tube and the cooling water consistent, further ensuring the uniformity of cooling.

[0043] It is worth noting that, as the high-temperature silicon core tube gradually cools down during the cooling process as the contact time between the silicon core tube and the cooling water increases, the silicon core tube also gradually shrinks in radial diameter. Therefore, the curvature of the arc surface of the limiting roller 31 in this embodiment gradually increases along the moving direction of the silicon core tube, so that the arc surface of the limiting roller 31 at each position can maintain the best fit with the silicon core tube at different shrinkage stages, thereby providing continuous, stable and precise geometric constraints, further ensuring the dimensional consistency and roundness accuracy of the final product. The curvature of the arc surface of the limiting roller 31 was obtained through repeated experiments by those skilled in the art.

[0044] To more precisely control the height of each rigid tube 21, and to reduce the buoyancy lifting effect on the silicon core tube by the shaping force applied to it, the present invention designs the following structure: (See attached diagram) Figure 1 and Figure 2The control component 23 includes several hydraulic cylinders 231 fixedly installed on the lower side of the frame 1 and corresponding one-to-one with the rigid pipe 21. The telescopic section of the hydraulic cylinder 231 is fixedly connected to the corresponding rigid pipe 21. By controlling the extension amount of the telescopic section of the hydraulic cylinder 231, the hydraulic cylinder 231 can adjust the height of the rigid pipe 21 at that position.

[0045] To ensure precise contact, positioning, and shaping of the silicon core tube by the limiting roller 31, the present invention designs the following structure: (See attached diagram) Figure 2 , Figure 3 and Figure 4 The drive assembly 33 includes several roller frames 331 arranged at equal intervals along the circumference of the rigid tube 21. The roller frames 331 are rotatably connected to the limiting rollers 31. A slide 332 is welded to the outside of the roller frames 331 and slides along the rigid tube 21 in a radial seal. A second hydraulic cylinder 333 is fixedly installed on the slide 332. The telescopic section of the second hydraulic cylinder 333 is fixedly connected to the rigid tube 21.

[0046] When the silicon core tube moves along the waterway formed by the rigid tube 21 and the flexible tube 22, the telescopic section of the hydraulic cylinder 333 on the same rigid tube 21 is simultaneously contracted. This causes the hydraulic cylinder 333 to drive the slide 332 to move closer to the axis of the rigid tube 21, which in turn causes the slide 332 to drive the roller frame 331 to move synchronously. This allows the limiting roller 31 at the same rigid tube 21 to simultaneously abut against the outer wall of the silicon core tube and push the silicon core tube to the coaxial position of the rigid tube 21. This facilitates the shaping of the silicon core tube at that position by adjusting the height of the rigid tube 21, while the arc-shaped surface combination of the limiting roller 31 on the same rigid tube 21 shapes the silicon core tube.

[0047] To further ensure the uniformity of cooling of the silicon core tube, the present invention designs the following structure: (See reference) Figure 3 , Figure 4 and Figure 5 The limiting roller 31 has several sets of grooves 311 evenly spaced along its circumference on its arc surface. Each set consists of several grooves 311 arranged on the arc surface along the axial direction of the limiting roller 31. Adjacent sets of grooves 311 are staggered. During cooling, as the silicon core tube moves continuously to the right, the silicon core tube drives the limiting roller 31, which is against its outer side, to rotate continuously. During rotation, a set of grooves 311 on the limiting roller 31 near the outer wall of the silicon core tube carries cooling water and contacts the wall of the silicon core tube. The arc surface part between two adjacent grooves 311 in this set is used to abut against the wall of the silicon core tube. The grooves 311 promote the local flow and renewal of cooling water in the limiting contact area with the silicon core tube.

[0048] See Figure 3 and Figure 4The cooling component 32 includes a blade shaft 321 that is rotatably mounted on a slide 332. The middle part of the blade shaft 321 is located in the cavity inside the corresponding limiting roller 31. Several blades are arranged on the blade shaft 321 along its axial direction, so that the rotating blade shaft 321 causes cooling water to flow in the cavity inside the limiting roller 31. A motor 322 is fixedly mounted on the slide 332. The output shaft of the motor 322 is connected to the corresponding blade shaft 321 through a belt drive structure.

[0049] During cooling, the starter motor 322 drives the blade shaft 321 to rotate at a low speed of 60-100 r / min in the internal cavity of the limiting roller 31 through the belt drive structure. This causes the blade shaft 321 to force the cooling water outside the limiting roller 31 to be transported into the limiting roller 31, and at the same time force the cooling water inside the limiting roller 31 to be transported to the outside, effectively removing the heat absorbed by the limiting roller 31 from the silicon core tube.

[0050] The groove 311 and the blade shaft 321 work together to ensure that the temperature of the limiting roller 31 body is synchronized with the temperature of the surrounding cooling water in real time. This achieves high-precision mechanical limiting with low contact area, while ensuring the high uniformity of circumferential cooling of the silicon core tube and preventing the problem of uneven cooling of the silicon core tube.

[0051] It should be noted that, as Figure 4 As shown, the end of the carriage 332 corresponding to the blade shaft 321 is an openable cover plate structure. The cover plate is sealed to the main body of the carriage 332 by screws. By separating the cover plate from the main body of the carriage 332, the belt drive structure in this embodiment can be conveniently installed and maintained.

[0052] Although this invention introduces a combination of independently adjustable rigid tubes 21 and flexible tubes 22, and a radially adjustable limiting roller 31 system with its own circulating cooling, compared to existing general three-stage cooling devices, which does increase the complexity of the device and the initial manufacturing cost, this investment is a one-time construction cost. More importantly, this design is a directional solution specifically proposed for HDPE silicon core tubes with extremely high requirements for roundness and straightness.

[0053] By solving the problem of limited straightness and roundness accuracy of silicon core tubes in traditional cooling processes, this device ensures that silicon core tubes meet the ultra-high geometric accuracy required for communication trunk line laying, significantly improving product qualification rate and consistency, and reducing scrap and rework losses caused by geometric deviations. The resulting technical and economic benefits far exceed the initial investment. More importantly, the high-precision silicon core tubes produced can significantly reduce the traction resistance and risks of subsequent optical cable laying, ensuring the long-term reliability and lifespan of communication lines. Therefore, this device is a necessary and efficient technical investment to address the manufacturing challenges of high-precision tubes such as silicon core tubes, and has clear practicality and outstanding industrial value.

[0054] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0055] Furthermore, the terms "first," "second," "number one," and "number two" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first," "second," "number one," or "number two" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0056] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0057] The embodiments described herein are preferred embodiments of the present invention and are not intended to limit the scope of protection of the present invention. Therefore, all equivalent changes made in accordance with the structure, shape, and principle of the present invention should be covered within the scope of protection of the present invention.

Claims

1. A cooling device for HDPE silicon core tube extrusion, comprising a frame, characterized in that, The frame is equipped with cooling channels for shaping silicon core tubes, and the cooling channels are equipped with limiting mechanisms for limiting the silicon core tubes at equal intervals along the left and right directions. The cooling channel includes several rigid pipes and flexible pipes that are alternately sealed and connected together. The rigid pipes at both ends are sealed and connected to the frame, so that the rigid pipes, flexible pipes and the frame form a continuous water channel. The frame is equipped with a control component to control the height of each rigid pipe. The limiting mechanism includes limiting rollers arranged circumferentially and at equal intervals inside the rigid tube via a driving component. The limiting rollers have a hollow structure. The driving component is equipped with a cooling component that allows cooling water to flow through the inside of the limiting rollers. The outer side of the limiting rollers has a concave arc-shaped surface, and the curvature of the arc-shaped surface of the limiting rollers gradually increases along the moving direction of the silicon core tube. During cooling, the limiting rollers on the same rigid tube combine and use their arc-shaped surfaces to abut against the silicon core tube for limiting and shaping with a low contact area. The rigid tubes, which are arranged from the middle to both sides, are shaped by the limiting rollers. By limiting, shaping, and fixing the silicon core tube, a high geometrically precise continuous cooling operation of the silicon core tube can be carried out.

2. The HDPE silicon core tube extrusion cooling device according to claim 1, characterized in that, The upper left side of the frame is welded with and connected to a water inlet pipe, and both ends of the frame are welded with water collection tanks for collecting leaked cooling water.

3. The HDPE silicon core tube extrusion cooling device according to claim 1, characterized in that, The control component includes several hydraulic cylinders fixedly installed on the lower side of the frame and corresponding one-to-one with the rigid pipes. The telescopic section of the hydraulic cylinder is fixedly connected to the corresponding rigid pipe.

4. The HDPE silicon core tube extrusion cooling device according to claim 1, characterized in that, The limiting roller has several sets of grooves evenly spaced along its circumference on its arc surface. Each set consists of several grooves arranged on the arc surface along the axial direction of the limiting roller, and adjacent sets of grooves are staggered.

5. The HDPE silicon core tube extrusion cooling device according to claim 4, characterized in that, The grooves in the same group carry cooling water and contact the wall of the silicon core tube, and the arc-shaped surface between two adjacent grooves in the group abuts against the wall of the silicon core tube.

6. The HDPE silicon core tube extrusion cooling device according to claim 1, characterized in that, The drive assembly includes several roller frames arranged at equal intervals along the circumference of the rigid tube. The roller frames are rotatably connected to the limiting rollers, and a slide frame that is radially sealed and slidably inserted into the rigid tube is welded to the outside of the roller frames.

7. The HDPE silicon core tube extrusion cooling device according to claim 6, characterized in that, A second hydraulic cylinder is fixedly installed on the slide, and the telescopic section of the second hydraulic cylinder is fixedly connected to the rigid pipe.

8. The HDPE silicon core tube extrusion cooling device according to claim 6, characterized in that, The cooling assembly includes a blade shaft that is rotatably and sealed on the carriage, with the middle part of the blade shaft located in the cavity inside the corresponding limiting roller.

9. The HDPE silicon core tube extrusion cooling device according to claim 8, characterized in that, Several blades are arranged along the axial direction on the blade shaft, so that the rotating blade shaft causes cooling water to flow in the cavity inside the limiting roller.

10. The HDPE silicon core tube extrusion cooling device according to claim 8, characterized in that, A motor is fixedly mounted on the slide, and the output shaft of the motor is connected to the corresponding blade shaft through a belt drive structure.

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