PU pipe and forming mold and forming method thereof

Abstract

The invention discloses a PU pipe and a forming die and method thereof.The PU pipe comprises an extruder, a die mounting base and a forming die body mounted at the right end of the die mounting base in a clamped mode, and cooling fins are arranged on the front side and the rear side of the forming die body in an attached mode; the cooling fins move left and right through telescopic mechanisms arranged at the front end and the rear end of the mold mounting base, an annular cooling pipe is fixed to the inner side of the fixing frame, and a plurality of cooling air nozzles which face the PU pipe and blow cold air to cool the PU pipe are arranged on the inner side of the cooling pipe at equal angles. The right side of the fixing frame is provided with an auxiliary mechanism with an extrusion shaping function at equal angles. According to the PU pipe and the forming mold and the forming method thereof, the forming mold body and the mold mounting base can be conveniently and rapidly disassembled, assembled and replaced, the cooling pipe and the cooling air nozzle are used for blowing and cooling the newly-extruded PU pipe, soft collapse is prevented, and the newly-extruded PU pipe can be subjected to extrusion forming in combination with the arrangement of an auxiliary mechanism.

Description

Technical Field

[0001] The present invention relates to the technical field related to PU pipe forming molds, and specifically relates to a PU pipe, its forming mold and forming method. Background Art

[0002] The full name of PU is polyurethane, which is usually a polymer material made by reacting raw materials such as isoniazid (MDI) and polyether, polyester, polyol, etc. A PU pipe is a pipe made of polyurethane material extruded by an extruder, and has many advantages such as wear resistance, oil resistance, aging resistance, and chemical corrosion resistance. It has a wide range of applications in many fields such as industry, agriculture, food, medicine, and civil engineering. Moreover, in the production and manufacturing process of PU pipes, a forming mold is required, and a PU pipe with a corresponding caliber is extruded according to the shape of the forming mold; For example, publication number CN115256863B discloses a PU pipe, its forming mold and forming method. This kind of PU pipe processes a colored PU pipe by double-layer co-extrusion. The outer layer of the PU pipe is a masterbatch layer, and the inner layer is a polyurethane layer, which reduces the usage amount of the masterbatch. And an observation port is provided on the side of the masterbatch layer, so that the PU pipe can be distinguished and the flow condition of the internal fluid can be observed. The inner layer aligned with the observation port is a new polyurethane material layer, which reduces the requirements for the extruder; this forming mold can control the size of the observation port as needed, and can automatically adjust the usage amount of the new material according to the size of the observation port, which can save the usage amount of new polyurethane material and ensure the recycling of recycled materials; For example, publication number CN220995377U discloses a plastic pipe extrusion mold, including an extruder and an extrusion mold. A connecting block is provided on the extruder, and the connecting block is fixedly connected to the extruder. An installation block is provided outside the connecting block. By pushing the extrusion mold, the extrusion mold drives the fixed block to move. When the limit groove on the installation block moves to the positioning block, the pressure on the limit spring disappears, and the limit spring drives the positioning block to reset and insert into the limit groove of the installation block through the slider, so that the extrusion mold can be installed and fixed on the extruder. Therefore, when installing the extrusion mold on the extruder, no special tool is required, and the extrusion mold can be installed and fixed on the extruder only by simple plugging. The installation and fixation are simple and convenient, saving time and effort; However, the existing PU pipes, their forming molds and forming methods still have the following deficiencies: The existing PU pipes, their forming molds and forming methods lack components for dissipating heat from the forming mold itself. When the mold is in a high-temperature state for a long time, it will have an adverse effect on the production of products. And before the extruded PU pipe is cooled by an external cooling device such as a cooling water tank, it needs to be transported for a certain distance. The initial rapid cooling at the extrusion outlet fails to be carried out in time. The just-formed PU pipe is prone to soft collapse, affecting the forming effect, and it is not convenient to extrude and shape the just-extruded PU pipe.

[0003] Therefore, we propose a PU pipe, its forming die and forming method to solve the problems raised above. Summary of the Invention

[0004] The purpose of the present invention is to provide a PU pipe, its forming die and forming method to solve the problems in the above-mentioned background technology, namely, the lack of components for dissipating heat from the forming die itself. When the die is in a high-temperature state for a long time, it will have an adverse impact on the production of products. And before the extruded PU pipe is cooled by an external cooling device such as a cooling water tank, it needs to be conveyed for a certain distance. It fails to be quickly cooled initially at the extrusion port, and the just-formed PU pipe is prone to soft collapse, affecting the forming effect, and it is not convenient to extrude and shape the just-extruded PU pipe.

[0005] To achieve the above purpose, the present invention provides the following technical solutions: A PU pipe, its forming die and forming method, including an extruder, a die mounting seat, and a forming die body snap-fitted to the right end of the die mounting seat. The PU pipe is extruded and formed by mixing organic diisocyanate or polyhydroxy compound as the main material through the extruder. Heat sinks are respectively attached to the front and rear sides of the forming die body, and the heat sinks are moved left and right by a telescopic mechanism provided at the front and rear ends of the die mounting seat; It also includes a fixed frame. An annular cooling pipe is fixed inside the fixed frame, and a plurality of cooling nozzles facing the PU pipe and blowing cold air to cool the PU pipe are arranged at equal angles inside the cooling pipe. An auxiliary mechanism with an extrusion and shaping function is arranged at equal angles on the right side of the fixed frame, and the auxiliary mechanism forms an elastic structure at the right end of the fixed frame.

[0006] Preferably, positioning plates for positioning are fixedly connected to the upper and lower sides of the right end of the die mounting seat, and fixing blocks are snap-fitted in the middle of the positioning plates, and the fixing blocks are respectively fixed to the upper and lower ends of the left side of the forming die body.

[0007] Preferably, the forming die body and the die mounting seat are connected by a limiting mechanism symmetrically arranged at the upper and lower ends of the die mounting seat. The limiting mechanism drives the forming die body to form a detachable structure at the right end of the die mounting seat; At the same time, the limiting mechanism is composed of connecting plates fixed to the upper and lower sides of the right end of the die mounting seat, connecting rods inserted in the middle of the connecting plates, connecting columns hinge-connected to the right ends of the connecting rods, mounting rods fixedly connected to the right ends of the connecting columns, and mounting caps with a limiting function.

[0008] Preferably, the connecting column drives the mounting rod to form a flipping structure at the right end of the connecting rod, and both the front and rear ends of the mounting rod are snap-connected to the fixed block. The connecting rod is telescopically connected to the connecting plate, and a mounting cap is threadedly connected to the outer surface of the connecting rod; Meanwhile, the mounting cap is closely arranged on the left side of the connecting plate.

[0009] Preferably, the telescopic mechanism includes a movable column and a support column arranged in a nested manner. The movable column is fixed to the heat sink by bolts, and anti-detachment blocks are fixedly connected to both the upper and lower sides of the left end of the movable column. The movable column drives the anti-detachment blocks to form a left-right sliding structure with the support column.

[0010] Preferably, the movable column and the support column are limited by a fastening bolt passing through the right end of the support column.

[0011] Preferably, the fixed frame is connected to the mold mounting base through a fixed bracket fixed on the left side. A support plate is fixedly connected to the outer side of the right end of the fixed frame, and an adjusting connecting bolt is threadedly connected to the middle of the support plate. One side of the connecting bolt close to the fixed frame is rotatably connected to an auxiliary plate, and a side plate is fixedly connected to the right end of the auxiliary plate; Wherein, the side plate forms a sliding structure with a positioning block fixed to the right end of the fixed frame.

[0012] Preferably, the auxiliary mechanism includes a connecting bracket arranged on the right side of the fixed frame and a pinch roller assembly that is rotatably installed in the middle of the connecting bracket and is in close contact with the PU tube.

[0013] Preferably, a hollow plate is fixedly connected to the middle of the connecting bracket, and the hollow plate forms a sliding structure with the side plate. A buffer spring is arranged between the hollow plate and the positioning block.

[0014] This solution also provides another technical solution, a method for using a PU tube and its forming mold. The method for using the PU tube and its forming mold includes the following steps: Step 1: Through the setting of the limiting mechanism, the quick disassembly and replacement between the forming mold body and the mold mounting base are realized; Step 2: The telescopic mechanism drives the heat sink to move left and right at the front and rear ends of the mold mounting base. The heat sink is attached to the front and rear sides of the forming mold body, improving the heat dissipation effect of the forming mold body itself and preventing the forming mold body from overheating; Step 3: The freshly extruded PU tube is quickly blown and cooled by the cooling pipe connected to the cold air blower and the cooling air nozzles arranged inside the cooling pipe to prevent soft collapse; Step 4: Through the setting of the auxiliary mechanism, the extruded and formed PU tube can be extruded and shaped.

[0015] Compared with the prior art, the beneficial effects of the present invention are as follows: For the PU tube, its forming die and forming method, through the setting of the limiting mechanism, it is convenient to quickly disassemble, assemble and replace between the forming die body and the die mounting seat. The telescopic mechanism drives the heat sink to move left and right and fit on the front and rear sides of the forming die body, which can dissipate the heat of the forming die body itself, prevent the temperature of the forming die body from being too high during long-term use and affecting the production of products. Moreover, by blowing air on the just-extruded PU tube through the cooling pipe and the cooling nozzle, soft collapse can be prevented. Combining the setting of the auxiliary mechanism, the just-extruded PU tube can be extruded and formed; 1. There are a fixed block, a fixed plate and a limiting mechanism. The limiting mechanism includes a connecting plate, a connecting rod, a connecting column, a mounting rod and a mounting cap. Through the setting of the fixed block, the fixed plate and the limiting mechanism, the disassembly, assembly and replacement between the forming die body and the die mounting seat can be carried out very quickly and stably; 2. There are heat sinks and a telescopic structure. The telescopic structure includes a movable column and a support column nested with each other. Through the telescopic structure, the heat sink is driven to move left and right on the front and rear sides of the die mounting seat, so that the heat sink is attached to the front and rear sides of the forming die body, and the heat of the forming die body itself can be quickly dissipated to the outside, preventing the temperature of the forming die body from being too high during long-term use and affecting the production quality of products; 3. There are a cooling pipe and a cooling nozzle. The cooling pipe is connected to an external air cooler. Through the setting of the cooling pipe and the cooling nozzle, cold air is blown onto the PU tube, so that the just-extruded PU tube can be quickly blown and cooled, preventing the just-extruded PU tube from soft collapsing; 4. There is an auxiliary mechanism. The auxiliary mechanism includes a connecting bracket and pinch rollers rotating on the connecting bracket. Through the setting of the auxiliary mechanism, the just-extruded PU tube can be further extruded and formed, and at the same time, it is convenient to stably convey the PU tube for the next step of processing. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 is a schematic diagram of the overall structure of the present invention; Figure 2 is a schematic diagram of the overall structure of the die mounting seat, the forming die body, the heat sink and the fixed frame of the present invention; Figure 3 is the present invention Figure 1 the enlarged structural schematic diagram at A in; Figure 4 is a schematic diagram of the overall structure of the die mounting seat, the forming die body and the limiting mechanism of the present invention; Figure 5 is a top view structural schematic diagram of the limiting mechanism of the present invention; Figure 6 is a schematic diagram of the flipping and separating structure of the connecting column, the mounting rod and the fixed block of the present invention; Figure 7 This is a rear view structural schematic diagram of the mold mounting seat, the molding die body, the heat sink, and the telescopic mechanism of the present invention; Figure 8 This is an exploded structural schematic diagram of the movable column, the support column, the heat sink, the anti - detachment block, and the fastening bolt of the present invention; Figure 9 This is a side view structural schematic diagram of the present invention; Figure 10 This is an overall structural schematic diagram of the fixed frame, the cooling pipe, the cooling nozzle, and the PU pipe of the present invention; Figure 11 This is an overall structural schematic diagram of the PU pipe passing through the cooling pipe and the cooling nozzle of the present invention; Figure 12 This is a structural schematic diagram of the fixed frame, the PU pipe, and the auxiliary mechanism of the present invention; Figure 13 This is an exploded structural schematic diagram of the connecting bracket, the pinch roller, the hollow plate, and the positioning block of the present invention.

[0017] In the figure: 1. Extruder; 2. Mold mounting seat; 3. Molding die body; 4. Fixed block; 5. Fixed plate; 6. Connecting plate; 7. Connecting rod; 8. Connecting column; 9. Mounting rod; 10. Mounting cap; 11. Heat sink; 12. Movable column; 13. Support column; 14. Anti - detachment block; 15. Fastening bolt; 16. Fixed bracket; 17. Fixed frame; 18. Cooling pipe; 19. Cooling nozzle; 20. Support plate; 21. Connecting bolt; 22. Auxiliary plate; 23. Side plate; 24. Positioning block; 25. Connecting bracket; 26. Pinch roller; 27. Hollow plate; 28. Buffer spring. Detailed implementation manners

[0018] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0019] Please refer to Figures 1 - 13 and the present invention provides the following technical solutions: In order to solve the problems existing in the prior art, that is, for the existing PU pipes, their forming molds and forming methods, there is a lack of components for dissipating heat from the forming molds themselves. When the molds are in a high-temperature state for a long time, it will have an adverse impact on the production of products. And before the extruded PU pipes are cooled by external cooling equipment such as a cooling water tank, they need to be conveyed over a certain distance, and the initial rapid cooling at the extrusion outlet cannot be carried out in time. The just-formed PU pipes are prone to soft collapse, affecting the forming effect, and it is not convenient to extrude and shape the just-extruded PU pipes. Therefore, through the following technical solutions, a PU pipe, its forming mold and forming method are provided. An extruder 1, a mold mounting seat 2 and a forming mold body 3 clamped and installed at the right end of the mold mounting seat 2 are provided; As Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 and Figure 6 shown, the PU pipe is extruded and formed by mixing organic diisocyanate or polyhydroxy compound as the main material through the extruder 1. The limiting mechanisms are symmetrically arranged at the upper and lower ends of the mold mounting seat 2. And the limiting mechanism is composed of connecting plates 6 fixed on the upper and lower sides at the right end of the mold mounting seat 2, connecting rods 7 inserted in the middle of the connecting plates 6, connecting columns 8 hinged to the right end of the connecting rods 7, mounting rods 9 fixedly connected to the right end of the connecting columns 8 and mounting caps 10 with a limiting function. First, the forming mold body 3 is clamped at the right end of the mold mounting seat 2, and the forming mold body 3 drives the fixed block 4 to be clamped in the middle of the fixed plate 5 to position between the forming mold body 3 and the mold mounting seat 2. Then, the connecting column 8 is flipped, and the connecting column 8 rotates at the right end of the connecting rod 7. The connecting column 8 drives the mounting rod 9 to be flipped, so that the mounting rod 9 is located on the right side of the fixed block 4. Then, the connecting rod 7 is pulled to the left, and the connecting rod 7 slides telescopically with the connecting plate 6. The connecting rod 7 together with the connecting column 8 drives the mounting rod 9 to be clamped in the middle of the fixed block 4. Then, the mounting cap 10 on the outer surface of the connecting rod 7 is rotated, so that the mounting cap 10 is attached to the left end of the connecting plate 6 to limit between the connecting rod 7 and the connecting plate 6. Through the settings of the fixed block 4, the fixed plate 5 and the limiting mechanism, it is convenient to quickly disassemble, install and replace between the forming mold body 3 and the mold mounting seat 2; After the installation and replacement are completed, as Figure 7 and Figure 8As shown, heat sinks 11 are attached to both the front and rear sides of the molding die body 3. The heat sinks 11 are moved left and right by telescopic mechanisms provided at the front and rear ends of the die mounting base 2. The telescopic mechanism includes a movable column 12 and a support column 13 that are nested. When the heat sinks 11 are not installed between the molding die body 3 and the die mounting base 2, they are located on the front and rear sides of the die mounting base 2 to avoid interfering with the installation between the molding die body 3 and the die mounting base 2. After the molding die body 3 is installed, by pulling the movable column 12 to the right, telescopic sliding occurs between the movable column 12 and the support column 13. At the same time, the movable column 12 drives the heat sinks 11 to be respectively attached to the front and rear sides of the molding die body 3. Anti-disengagement blocks 14 are fixedly connected to both the upper and lower ends of the movable column 12. The movable column 12 drives the anti-disengagement blocks 14 to slide with the support column 13. When moving to the state as shown in Figure 7 , the support column 13 and the movable column 12 are limited by rotating the fastening bolt 15, thereby positioning between the heat sink 11 and the molding die body 3. By being attached to each other between the heat sink 11 and the molding die body 3, it can assist in dissipating the heat of the molding die body 3 itself faster to the outside, preventing heat accumulation in the molding die body 3 during long-term use and affecting the production quality of products; In addition, as shown in Figure 9 , Figure 10 , Figure 11 , Figure 12 and Figure 13 , the PU pipe extruded and formed by the cooperation of the extruder 1, the die mounting base 2, and the molding die body 3 moves to the right and passes through the middle of the fixed frame 17. The fixed frame 17 is connected to the die mounting base 2 through the fixed bracket 16. At the same time, an annular cooling pipe 18 is fixed inside the fixed frame 17, and a plurality of cooling nozzles 19 that face the PU pipe and blow cold air to cool the PU pipe are arranged at equal angles inside the cooling pipe 18. The cooling pipe 18 is connected to an external air cooler. When the PU pipe is just extruded and formed, cold air is blown to the PU pipe through the cooling nozzles 19 for rapid cooling to prevent soft collapse during transportation. After cooling, it is further cooled by tools in the next stage, such as passing through a long water tank for cooling; An auxiliary mechanism with an extrusion and shaping function is equiangularly arranged on the right side of the fixed frame 17. At the same time, the auxiliary mechanism forms an elastic structure at the right end of the fixed frame 17. The auxiliary mechanism includes a connecting bracket 25 arranged on the right side of the fixed frame 17 and a pinch roller 26 that is rotatably installed in the middle of the connecting bracket 25 and is arranged in a fitting manner with the PU pipe. By rotating the connecting bolt 21 that is threadedly connected to the middle of the support plate 20, the connecting bolt 21 rotates between the auxiliary plate 22. The auxiliary plate 22 drives the side plate 23 to slide between the positioning block 24, so that the anti-detachment block 14 drives the connecting bracket 25 and the pinch roller 26 to move at the right end of the fixed frame 17, driving the pinch roller 26 to be respectively arranged in a fitting manner on the outer side of the PU pipe. Through the setting of the auxiliary mechanism, the just-extruded PU pipe can be extruded and formed. Moreover, during the transmission of the PU pipe, when the pinch roller 26 is squeezed, the pinch roller 26 together with the connecting bracket 25 drives the hollow plate 27 to move, so that the hollow plate 27 slides between the positioning block 24. The hollow plate 27 squeezes the buffer spring 28, causing the buffer spring 28 to undergo elastic deformation. Thus, the pinch roller 26 forms an elastic structure at the right end of the fixed frame 17, which can play a certain buffering role and improve the stability of the PU pipe during transmission while clamping.

[0020] The content not described in detail in this specification belongs to the prior art well-known to those skilled in the art. The standard parts used in the present invention can all be purchased from the market. The special-shaped parts can be customized according to the description in the specification and the drawings. The specific connection methods of each part all adopt conventional means such as bolts, rivets, and welding that are mature in the prior art. The machines, parts, and equipment all adopt conventional models in the prior art. Coupled with the circuit connection adopting the conventional connection method in the prior art, it will not be elaborated here.

[0021] Although the present invention has been described in detail with reference to the foregoing embodiments, for those skilled in the art, they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements for some of the technical features. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A PU pipe forming die, comprising an extruder (1), a die mounting base (2), and a forming die body (3) snap-fitted and mounted at the right end of the die mounting base (2); characterized in that: The PU pipe is extruded and formed by mixing organic diisocyanate or polyhydroxy compound as the main material through an extruder (1). Heat sinks (11) are attached to both the front and rear sides of the forming die body (3), and the heat sinks (11) are moved left and right by a telescopic mechanism arranged at the front and rear ends of the die mounting seat (2). It further includes a fixed frame (17). An annular cooling pipe (18) is fixed inside the fixed frame (17), and a plurality of cooling nozzles (19) facing the PU pipe and blowing cold air to cool the PU pipe are arranged at equal angles inside the cooling pipe (18). An auxiliary mechanism with an extrusion and shaping function is arranged at equal angles on the right side of the fixed frame (17), and at the same time, the auxiliary mechanism forms an elastic structure at the right end of the fixed frame (17).

2. The PU tube forming die according to claim 1, characterized in that: Fixing plates (5) for positioning are fixedly connected to both the upper and lower sides of the right end of the die mounting seat (2), and a fixing block (4) is snap-fitted in the middle of the fixing plate (5). At the same time, the fixing blocks (4) are respectively fixed to the upper and lower ends on the left side of the forming die body (3).

3. A PU tube forming die according to claim 1, characterized in that: The forming die body (3) is connected to the die mounting seat (2) through a limiting mechanism symmetrically arranged at the upper and lower ends of the die mounting seat (2). The limiting mechanism drives the forming die body (3) to form a disassembly structure at the right end of the die mounting seat (2). At the same time, the limiting mechanism is composed of connecting plates (6) fixed to the upper and lower sides of the right end of the die mounting seat (2), a connecting rod (7) inserted in the middle of the connecting plate (6), a connecting column (8) hinged to the right end of the connecting rod (7), a mounting rod (9) fixedly connected to the right end of the connecting column (8), and a mounting cap (10) with a limiting function.

4. A PU tube forming mold according to claim 3, characterized in that: The connecting column (8) drives the mounting rod (9) to form a flipping structure at the right end of the connecting rod (7), and both the front and rear ends of the mounting rod (9) are snap-fitted with the fixing block (4). The connecting rod (7) is telescopically connected in the connecting plate (6), and a mounting cap (10) is threadedly connected to the outer surface of the connecting rod (7). At the same time, the mounting cap (10) is attached to the left side of the connecting plate (6).

5. A PU tube forming mold according to claim 1, characterized in that: The telescopic mechanism includes a movable column (12) and a support column (13) arranged in a nested manner. The movable column (12) is fixed to the heat sink (11) by bolts, and anti-detachment blocks (14) are fixedly connected to both the upper and lower sides of the left end of the movable column (12). The movable column (12) drives the anti-detachment blocks (14) to form a left-right sliding structure with the support column (13).

6. The PU tube forming die according to claim 5, characterized in that: The movable column (12) and the support column (13) are limited by a fastening bolt (15) penetrating through the right end of the support column (13).

7. A PU tube forming die according to claim 1, characterized in that: The fixed frame (17) is connected to the die mounting seat (2) through a fixed bracket (16) fixed on the left side. A support plate (20) is fixedly connected to the outer side of the right end of the fixed frame (17), and an adjusting connecting bolt (21) is threadedly connected to the middle of the support plate (20). An auxiliary plate (22) is rotatably connected to the side of the connecting bolt (21) close to the fixed frame (17), and a side plate (23) is fixedly connected to the right end of the auxiliary plate (22). Among them, a sliding structure is formed between the side plate (23) and the positioning block (24) fixed to the right end of the fixed frame (17).

8. A PU tube forming die according to claim 7, characterized in that: The auxiliary mechanism includes a connecting bracket (25) arranged on the right side of the fixed frame (17) and a pinch roller (26) rotatably installed in the middle of the connecting bracket (25) and fittingly arranged with the PU pipe.

9. A PU tube forming die according to claim 8, characterized in that: A hollow plate (27) is fixedly connected to the middle of the connecting bracket (25), and a sliding structure is formed between the hollow plate (27) and the side plate (23). A buffer spring (28) is arranged between the hollow plate (27) and the positioning block (24).

10. A method for using a PU tube forming die as described in claim 1, characterized in that: The using method of the PU pipe forming die includes the following steps: Step 1: Through the setting of the limiting mechanism, the quick disassembly and replacement between the forming die body (3) and the die mounting seat (2) are realized; Step 2: The telescopic mechanism drives the heat dissipation fins (11) to move left and right at the front and rear ends of the die mounting seat (2), and the heat dissipation fins (11) are attached to the front and rear sides of the forming die body (3), improving the heat dissipation effect of the forming die body (3) itself and preventing the forming die body (3) from overheating; Step 3: The freshly extruded PU pipe is quickly blown and cooled by the cooling pipe (18) connected to the cold air blower and the cooling air nozzles (19) arranged inside the cooling pipe (18) to prevent soft collapse; Step 4: Through the setting of the auxiliary mechanism, the extruded and formed PU pipe can be extruded and shaped.

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