Power straight-wall pipe extrusion forming device with uniform wall thickness

Abstract

The present application relates to the technical field of extrusion equipment, and particularly relates to an electric straight-wall pipe extrusion forming device with uniform wall thickness. The electric straight-wall pipe extrusion forming device with uniform wall thickness provided by the present application solves the technical problem of non-uniform wall thickness of pipe material extruded by the pipe extrusion forming device in the prior art. The electric straight-wall pipe extrusion forming device with uniform wall thickness comprises a rack, the rack is provided with an extrusion assembly, a cooling assembly for cooling pipe material extruded by the extrusion assembly, a traction assembly for traction of the pipe material cooled by the cooling assembly, and a temperature reduction assembly for reducing the temperature of the pipe material cooled by the cooling assembly; by arranging a first buffer cavity and a second buffer cavity, and gradually narrowing the two buffer cavities from the feeding channel side to the extrusion channel side, the material can be fully buffered and uniformly distributed before entering the extrusion channel, and this design avoids the problem of uneven distribution of the material caused by the traditional feeding cavity directly entering the extrusion channel.

Description

Technical Field

[0001] This invention relates to the field of extrusion equipment technology, and in particular to an electric straight-wall tube extrusion molding device with uniform wall thickness. Background Technology

[0002] Power pipe extrusion equipment is one of the important pieces of equipment in the plastics processing industry. It is mainly used to process raw materials through processes such as mixing, heating, extrusion, and cooling to produce power pipes with specific specifications and performance, such as multi-layer straight-wall power pipes. Power pipe extrusion equipment is widely used in the fields of power, communication, and construction to produce various specifications of power pipes, communication pipes, and other pipe products.

[0003] Existing power pipe extrusion equipment includes an extrusion assembly, which typically comprises several feed chambers. These chambers supply material into the extrusion channel, where it forms a tube. After cooling, the tube is formed, thus achieving pipe production. However, the feed chambers in existing technologies are usually composed of several holes evenly distributed along the extrusion channel. This results in uneven material distribution within the extrusion channel, potentially leading to uneven pipe wall thickness and other problems.

[0004] Therefore, the existing pipe extrusion molding equipment has the technical problem of uneven wall thickness of the extruded pipe. Summary of the Invention

[0005] The present invention provides an electric straight-wall tube extrusion molding device with uniform wall thickness, which solves the technical problem of uneven wall thickness of the tube extruded by the tube extrusion molding device in the prior art.

[0006] Some implementation schemes for solving the above-mentioned technical problems include: A power straight-wall tube extrusion molding apparatus with uniform wall thickness includes a frame, the frame being provided with an extrusion assembly, a cooling assembly for cooling the tube extruded by the extrusion assembly, a traction assembly for pulling the tube cooled by the cooling assembly, and a cooling assembly for reducing the temperature of the tube cooled by the cooling assembly. The extrusion assembly includes a base body, the base body being provided with an extrusion cavity, the base body also being provided with a support tube for limiting the inner diameter of the tube, the inner wall of the extrusion cavity being provided with a first forming ring, the first forming ring and the support tube forming a first extrusion channel, the inner wall of the extrusion cavity also being provided with a second forming ring, the second forming ring and the first forming ring forming a second extrusion channel, the material extruded through the second extrusion channel covering the material extruded through the first extrusion channel; The base body is further provided with a first feeding chamber for supplying material to the first extrusion channel and a second feeding chamber for supplying material to the second extrusion channel. The first feeding chamber is connected to the first extrusion channel through a first feeding channel, and the first feeding channel is connected to the first extrusion channel through a first buffer chamber. The first buffer chamber gradually narrows from the side closer to the first feeding channel to the side closer to the first extrusion channel. The second feeding chamber is connected to the second extrusion channel through a second feeding channel, and the second feeding channel is connected to the second extrusion channel through a second buffer chamber. The second buffer chamber gradually narrows from the side closer to the second feeding channel to the side closer to the second extrusion channel.

[0007] Preferably, the first forming ring is provided with a first smoothing tooth for smoothing the material in the first extrusion channel, and there are at least two first smoothing teeth. The first smoothing teeth and the first forming ring are an integral structure.

[0008] Preferably, the second forming ring is provided with a second smoothing tooth for smoothing the material in the second extrusion channel, and there are at least two second smoothing teeth. The second smoothing teeth and the second forming ring are an integral structure.

[0009] Preferably, the inner wall of the extrusion cavity is provided with a first mounting step, the first molding ring is fixed to the first mounting step by screws, and one side wall of the first molding ring is one side wall of the first buffer cavity.

[0010] Preferably, the inner wall of the extrusion chamber is further provided with a second mounting step, the second forming ring is fixed to the second mounting step by screws, the other side wall of the first forming ring is a side wall of the second buffer chamber, one side wall of the second forming ring is another side wall of the second buffer chamber, and the diameter of the first forming ring is smaller than the diameter of the second forming ring.

[0011] Preferably, the first feeding channel is a first through hole evenly distributed along the circumference of the base, and the second feeding channel is a second through hole evenly distributed along the circumference of the base.

[0012] Preferably, the cooling assembly includes a ring seat surrounding the support tube, the ring seat being provided with a first spray hole, and the cooling assembly further includes a first water pump supplying coolant to the first spray hole, the first spray hole being uniformly arranged along the circumference of the ring seat.

[0013] Preferably, the cooling component includes a ring body disposed on the frame, the ring body having second nozzles evenly distributed thereon, the liquid sprayed from the second nozzles being sprayed onto the pipe cooled by the cooling component, and the cooling component further includes a second water pump supplying coolant to the second nozzles.

[0014] Preferably, the cooling assembly further includes an air-cooling mechanism for cooling the inner cavity of the pipe. The air-cooling mechanism includes an air supply pipe installed on the base, extending into the pipe and into the pipe after it has been cooled by the cooling assembly. The air supply pipe is also provided with a support, and the support is provided with a jet nozzle. The gas ejected from the jet nozzle is evenly blown toward the inner wall of the pipe. The cooling gas in the air supply pipe is ejected through the jet nozzle. A return air chamber is formed between the air supply pipe and the support pipe. The base is also provided with a vacuum pump, which extracts the gas that has undergone heat exchange with the pipe in the return air chamber. The air-cooling mechanism also includes an air supply pump, the supply flow rate of which is not greater than the extraction flow rate of the vacuum pump.

[0015] Preferably, the traction assembly includes a ring frame disposed on the frame, the ring frame being provided with a drive wheel, and the ring frame also being provided with a motor for driving the drive wheel. The drive wheel contacts the pipe cooled by the cooling assembly and pulls the pipe. A gap is formed between the drive wheel and the support for the pipe to pass through.

[0016] Compared with the prior art, the present invention has the following advantages: By incorporating a first buffer chamber and a second buffer chamber, both of which gradually narrow from the feed channel side towards the extrusion channel side, the material can be adequately buffered and evenly distributed before entering the extrusion channel. This design avoids the uneven material distribution problem that can occur when the material directly enters the extrusion channel from the traditional feed chamber, thus significantly improving the uniformity of the pipe wall thickness. The cooperation of the first forming ring and the second forming ring further ensures stable material flow during the extrusion process, reducing the possibility of wall thickness fluctuations.

[0017] The independent design of the first and second extrusion channels allows the inner and outer layers of material to be supplied through the first and second feeding chambers respectively, achieving precise coating during the extrusion process. The material in the second extrusion channel completely covers the material in the first extrusion channel, forming a multi-layer structure that ensures the performance and appearance quality of the pipe.

[0018] The gradually narrowing structure of the buffer cavity not only achieves uniform material distribution but also optimizes material flow stability. The material undergoes a gradual compression process before entering the extrusion channel, reducing turbulence and eddies during flow, thereby lowering the risk of stress concentration or defect formation within the tube. This design is particularly suitable for the production of high-precision tubes, ensuring the smoothness and controllability of the extrusion process.

[0019] The independent design of the first and second feeding channels allows the equipment to adapt to the extrusion requirements of different materials, such as inner and outer layers using plastic materials with different properties. Furthermore, the coordination of the cooling and traction components further enhances the overall efficiency of the equipment.

[0020] By optimizing material distribution and flow stability, this device significantly reduces the scrap rate in pipe production and improves production efficiency. Simultaneously, the improved wall thickness uniformity directly enhances the mechanical properties and durability of the pipes, meeting the demands of the power, communications, and other industries for high-quality pipes. Attached Figure Description

[0021] For illustrative purposes, several embodiments of the invention are illustrated in the following figures. These figures are incorporated herein by reference and form part of the detailed description. In some instances, well-known structures and components are shown in block diagram form to avoid obscuring the concept of the subject matter of the invention.

[0022] Figure 1 This is a schematic diagram of the internal structure of the present invention.

[0023] Figure 2 for Figure 1 Enlarged view of point A in the middle.

[0024] Figure 3 This is a schematic diagram of the first angle of the present invention.

[0025] Figure 4 This is a schematic diagram of the second angle of the present invention.

[0026] Figure 5 This is an exploded view of the extruded component.

[0027] Figure 6 This is a schematic diagram of the gas supply pipe.

[0028] Figure 7 This is a schematic diagram of the traction component.

[0029] As shown in the figure: 1. Frame; 11. Water tank.

[0030] 2. Extrusion assembly, 21. Seat, 211. Extrusion chamber, 212. First mounting step, 213. Second mounting step, 22. Support tube, 23. First forming ring, 231. First extrusion channel, 232. First smoothing tooth, 24. Second forming ring, 241. Second extrusion channel, 242. Second smoothing tooth, 25. First feeding chamber, 251. First feeding channel, 252. First buffer chamber, 26. Second feeding chamber, 261. Second feeding channel, 262. Second buffer chamber.

[0031] 3. Cooling assembly, 31. Ring seat, 32. First nozzle.

[0032] 4. Traction assembly; 41. Ring frame; 42. Drive wheel.

[0033] 5. Cooling component, 51. Ring body, 52. Second nozzle, 53. Air cooling mechanism, 531. Air supply pipe, 532. Support, 5321. Air jet, 533. Return air chamber. Detailed Implementation

[0034] The specific embodiments shown below are intended to describe various configurations of the subject matter of the invention and are not intended to represent the only configuration in which the subject matter of the invention can be practiced. The specific embodiments include particular details intended to provide a thorough understanding of the subject matter of the invention. However, it will be clear and apparent to those skilled in the art that the subject matter of the invention is not limited to the specific details shown herein and can be practiced without these specific details.

[0035] Understandably, in this document, relational terms such as “first” and “second” are intended to distinguish one entity or operation from another, and are not intended to expressly or imply any actual relationship or order between these entities or operations.

[0036] The terms “comprising,” “including,” or any other variations thereof are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitation, an element defined by the phrase “comprising one…” does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0037] Reference Figures 1 to 7 As shown, an extrusion molding device for a straight-walled electric tube with uniform wall thickness includes a frame 1. The frame 1 is provided with an extrusion assembly 2, a cooling assembly 3 for cooling the tube extruded by the extrusion assembly 2, a traction assembly 4 for pulling the tube cooled by the cooling assembly 3, and a cooling assembly 5 for reducing the temperature of the tube cooled by the cooling assembly 3. The extrusion assembly 2 includes a base 21, which is provided with an extrusion cavity 211. The base 21 is also provided with a support tube 22 for limiting the inner diameter of the tube. The inner wall of the extrusion cavity 211 is provided with a first forming ring 23, which forms a first extrusion channel 231 with the support tube 22. The inner wall of the extrusion cavity 211 is also provided with a second forming ring 24, which forms a second extrusion channel 241 with the first forming ring 23. The material extruded from the second extrusion channel 241 covers the material extruded from the first extrusion channel 231. The base 21 is further provided with a first feeding chamber 25 for supplying material to the first extrusion channel 231 and a second feeding chamber 26 for supplying material to the second extrusion channel 241. The first feeding chamber 25 communicates with the first extrusion channel 231 through the first feeding channel 251. The first feeding channel 251 communicates with the first extrusion channel 231 through a first buffer chamber 252. The first buffer chamber 252 gradually narrows from the side closer to the first feeding channel 251 to the side closer to the first extrusion channel 231. The second feeding chamber 26 communicates with the second extrusion channel 241 through a second feeding channel 261. The second feeding channel 261 communicates with the second extrusion channel 241 through a second buffer chamber 262. The second buffer chamber 262 gradually narrows from the side closer to the second feeding channel 261 to the side closer to the second extrusion channel 241.

[0038] In some embodiments, the first forming ring 23 is provided with first smoothing teeth 232 for smoothing the material in the first extrusion channel 231. There are at least two first smoothing teeth 232, and the first smoothing teeth 232 and the first forming ring 23 are an integral structure.

[0039] Understandably, the first smoothing tooth 232 is mainly used to make the outer wall of the tube extruded from the first extrusion channel 231 smooth and uniform. The shape of the first smoothing tooth 232 is not limited, but the cross-sectional shape of the first smoothing tooth 232 can usually be triangular or the like.

[0040] In some embodiments, the second forming ring 24 is provided with a second smoothing tooth 242 for smoothing the material in the second extrusion channel 241. There are at least two second smoothing teeth 242, and the second smoothing teeth 242 and the second forming ring 24 are an integral structure.

[0041] Understandably, the second smoothing tooth 242 is mainly used to make the outer wall of the pipe extruded from the second extrusion channel 241 smooth and uniform. The shape of the second smoothing tooth 242 is not limited, but the cross-sectional shape of the second smoothing tooth 242 can usually be triangular or the like.

[0042] Reference Figures 1 to 7As shown, in some embodiments, the inner wall of the extrusion cavity 211 is provided with a first mounting step 212, the first molding ring 23 is fixed to the first mounting step 212 by screws, and one side wall of the first molding ring 23 is one side wall of the first buffer cavity 252.

[0043] Understandably, there are multiple screws used to fix the first forming ring 23, and the multiple screws are evenly distributed along the circumference of the first forming ring 23.

[0044] The first molding ring 23 is fixed to the base 21 by a detachable connection. The first molding ring 23 can be easily removed to maintain the molding component, making the molding device easy to maintain.

[0045] In some embodiments, the inner wall of the extrusion cavity 211 is further provided with a second mounting step 213, the second forming ring 24 is fixed to the second mounting step 213 by screws, the other side wall of the first forming ring 23 is a side wall of the second buffer cavity 262, one side wall of the second forming ring 24 is another side wall of the second buffer cavity 262, and the diameter of the first forming ring 23 is smaller than the diameter of the second forming ring 24.

[0046] Understandably, there are multiple screws used to fix the second forming ring 24, and the multiple screws are evenly distributed along the circumference of the second forming ring 24.

[0047] The second molding ring 24 is fixed to the base 21 by a detachable connection, making the molding assembly easy to maintain.

[0048] In some embodiments, the first feeding channel 251 is a first through hole evenly distributed along the circumference of the seat 21, and the second feeding channel 261 is a second through hole evenly distributed along the circumference of the seat 21.

[0049] Understandably, the cross-sectional shape of both the first through hole and the second through hole can be circular to prevent material from being trapped in the first through hole or / and the second through hole.

[0050] In some embodiments, the cooling assembly 3 includes a ring seat 31 surrounding the support tube 22, the ring seat 31 being provided with a first spray hole 32, and the cooling assembly 3 further includes a first water pump supplying coolant to the first spray hole 32, the first spray hole 32 being uniformly arranged along the circumference of the ring seat 31.

[0051] In some embodiments, the ring seat 31 is fixed to the frame 1 by a bracket.

[0052] Understandably, the length of the support tube 22 extending out of the extrusion chamber 211 is not too long. Typically, the length of the support tube 22 extending out of the extrusion chamber 211 can be 5 to 10 centimeters, so that the ring seat 31 can effectively cool the tube and prevent the tube from deforming.

[0053] The coolant sprayed from the first nozzle 32 directly impacts the pipe. At this time, the temperature of the pipe is still relatively high. However, by setting up the support pipe 22, the pipe can be prevented from deforming.

[0054] Understandably, the coolant ejected from the first nozzle 32 should be sprayed away from the extrusion assembly 2 to prevent the coolant from splashing onto the extrusion assembly 2.

[0055] In some embodiments, the cooling component 5 includes a ring 51 disposed on the frame 1, the ring 51 having second nozzles 52 evenly distributed thereon, the liquid sprayed from the second nozzles 52 being sprayed toward the pipe cooled by the cooling component 3, and the cooling component 5 further includes a second water pump supplying coolant to the second nozzles 52.

[0056] Understandably, there can be multiple ring bodies 51 and second water pumps. Multiple ring bodies 51 are used to cool the pipe multiple times, thereby improving the cooling efficiency of the pipe.

[0057] Reference Figures 1 to 7 As shown, in some embodiments, the cooling component 5 further includes an air cooling mechanism 53 for cooling the inner cavity of the pipe. The air cooling mechanism 53 includes an air supply pipe 531 installed on the base 21, the air supply pipe 531 extending into the pipe and into the pipe after being cooled by the cooling component 3. The air supply pipe 531 is also provided with a support 532, and the support 532 is provided with a jet hole 5321. The gas ejected from the jet hole 5321 is blown evenly toward the inner wall of the pipe. The cooling gas in the air supply pipe 531 is ejected through the jet hole 5321. A return air chamber 533 is formed between the air supply pipe 531 and the support pipe 22. The base 21 is also provided with a vacuum pump, which extracts the gas in the return air chamber 533 after heat exchange with the pipe. The air cooling mechanism 53 also includes an air supply pump, the supply flow rate of which is not greater than the extraction flow rate of the vacuum pump.

[0058] In some embodiments, the air supply pipe 531 may be made of heat-insulating material to prevent the air supply pipe 531 from interfering with the temperature stability of the extrusion assembly 2.

[0059] In some embodiments, the traction assembly 4 includes a ring frame 41 disposed on the frame 1, the ring frame 41 is provided with a drive wheel 42, the ring frame 41 is also provided with a motor that drives the drive wheel 42, the drive wheel 42 contacts the pipe cooled by the cooling assembly 3 and pulls the pipe, and a gap is formed between the drive wheel 42 and the support 532 for the pipe to pass through.

[0060] In some embodiments, there may be multiple drive wheels 42, which can be evenly distributed around the ring frame 41. The more drive wheels 42 there are, the larger the contact area between the drive wheels 42 and the pipe, and the less likely the drive wheels 42 are to damage the pipe.

[0061] Understandably, there can be multiple traction components 4, which are distributed along the length of the pipe to further increase the contact area between the drive wheel 42 and the pipe and prevent the pipe from being damaged.

[0062] Understandably, each drive wheel 42 can be driven by an independent motor.

[0063] In some embodiments, the frame 1 may be provided with a water receiving tank, and the coolant enters the water receiving tank under gravity after heat exchange with the pipes. Both the first water pump and the second water pump may be provided in the water receiving tank.

[0064] In some embodiments, a cooler may also be installed in the water tank 11 to cool the coolant in the water tank.

[0065] In some embodiments, the coolant may be water.

[0066] The technical solution of the present invention and its corresponding details have been described above. It is understood that the above description is only some implementation schemes of the technical solution of the present invention, and some details may be omitted in the specific implementation.

[0067] Furthermore, in some embodiments of the above invention, multiple embodiments may be combined; however, due to space limitations, all such combinations will not be listed here. Those skilled in the art can freely combine and implement the above embodiments according to their needs to obtain a better application experience.

[0068] When implementing the subject matter of this invention, those skilled in the art can obtain other detailed configurations or drawings based on the subject matter and drawings. Obviously, these details are still within the scope of the subject matter of this invention without departing from it.

Claims

1. A power straight-wall tube extrusion molding device with uniform wall thickness, characterized in that: The device includes a frame (1), which is provided with an extrusion assembly (2), a cooling assembly (3) for cooling the pipe extruded by the extrusion assembly (2), a traction assembly (4) for pulling the pipe cooled by the cooling assembly (3), and a cooling assembly (5) for reducing the temperature of the pipe cooled by the cooling assembly (3). The extrusion assembly (2) includes a base (21), which is provided with an extrusion chamber (211). The base (21) is also provided with a support tube (22) for limiting the inner diameter of the pipe. The inner wall of the extrusion chamber (211) is provided with a first forming ring (23), which forms a first extrusion channel (231) between the first forming ring (23) and the support tube (22). The inner wall of the extrusion chamber (211) is also provided with a second forming ring (24), which forms a second extrusion channel (241) between the second forming ring (24) and the first forming ring (23). The material extruded by the second extrusion channel (241) covers the material extruded by the first extrusion channel (231). In addition to the material, the seat (21) is also provided with a first feeding chamber (25) for supplying material to the first extrusion channel (231) and a second feeding chamber (26) for supplying material to the second extrusion channel (241). The first feeding chamber (25) is connected to the first extrusion channel (231) through the first feeding channel (251). The first feeding channel (251) is connected to the first extrusion channel (231) through the first buffer chamber (252). The first buffer chamber (252) gradually narrows from the side closer to the first feeding channel (251) to the side closer to the first extrusion channel (231). The second feeding chamber (26) is connected to the second extrusion channel (241) through the second feeding channel (261). The second feeding channel (261) is connected to the second extrusion channel (241) through the second buffer chamber (262). The second buffer chamber (262) gradually narrows from the side closer to the second feeding channel (261) to the side closer to the second extrusion channel (241).

2. The electric straight-wall tube extrusion molding apparatus with uniform wall thickness according to claim 1, characterized in that: The first forming ring (23) is provided with a first smoothing tooth (232) to smooth the material in the first extrusion channel (231). There are at least two first smoothing teeth (232), and the first smoothing teeth (232) and the first forming ring (23) are an integral structure.

3. The electric straight-wall tube extrusion molding apparatus with uniform wall thickness according to claim 1, characterized in that: The second forming ring (24) is provided with a second smoothing tooth (242) to smooth the material in the second extrusion channel (241). There are at least two second smoothing teeth (242), and the second smoothing teeth (242) and the second forming ring (24) are an integral structure.

4. The electric straight-wall tube extrusion molding apparatus with uniform wall thickness according to claim 1, characterized in that: The inner wall of the extrusion cavity (211) is provided with a first mounting step (212), and the first molding ring (23) is fixed to the first mounting step (212) by screws. One side wall of the first molding ring (23) is one side wall of the first buffer cavity (252).

5. The electric straight-wall tube extrusion molding apparatus with uniform wall thickness according to claim 4, characterized in that: The inner wall of the extrusion chamber (211) is also provided with a second mounting step (213), and the second molding ring (24) is fixed to the second mounting step (213) by screws. The other side wall of the first molding ring (23) is a side wall of the second buffer chamber (262), and one side wall of the second molding ring (24) is another side wall of the second buffer chamber (262). The diameter of the first molding ring (23) is smaller than the diameter of the second molding ring (24).

6. The electric straight-wall tube extrusion molding apparatus with uniform wall thickness according to claim 1, characterized in that: The first feeding channel (251) is a first through hole evenly distributed along the circumference of the seat (21), and the second feeding channel (261) is a second through hole evenly distributed along the circumference of the seat (21).

7. The electric straight-wall tube extrusion molding apparatus with uniform wall thickness according to claim 1, characterized in that: The cooling assembly (3) includes a ring seat (31) surrounding the support tube (22), the ring seat (31) being provided with a first nozzle (32), and the cooling assembly (3) further includes a first water pump supplying coolant to the first nozzle (32), the first nozzle (32) being uniformly arranged along the circumference of the ring seat (31).

8. The electric straight-wall tube extrusion molding apparatus with uniform wall thickness according to claim 1, characterized in that: The cooling component (5) includes a ring (51) disposed on the frame (1), and the ring (51) is evenly distributed with second nozzles (52). The liquid sprayed from the second nozzles (52) is sprayed onto the pipe cooled by the cooling component (3). The cooling component (5) also includes a second water pump that supplies coolant to the second nozzles (52).

9. The electric straight-wall tube extrusion molding apparatus with uniform wall thickness according to claim 8, characterized in that: The cooling assembly (5) further includes an air cooling mechanism (53) for cooling the inner cavity of the pipe. The air cooling mechanism (53) includes an air supply pipe (531) installed on the base (21). The air supply pipe (531) extends into the pipe and into the pipe after it has been cooled by the cooling assembly (3). The air supply pipe (531) is also provided with a support (532). The support (532) is provided with a jet nozzle (5321). The gas ejected from the air supply pipe (5321) is evenly blown toward the inner wall of the pipe. The cooling gas in the air supply pipe (531) is ejected through the jet hole (5321). A return air chamber (533) is formed between the air supply pipe (531) and the support pipe (22). The seat (21) is also equipped with a vacuum pump. The vacuum pump extracts the gas in the return air chamber (533) after heat exchange with the pipe. The air cooling mechanism (53) also includes an air supply pump. The supply flow rate of the air supply pump is not greater than the suction flow rate of the vacuum pump.

10. The electric straight-wall tube extrusion molding apparatus with uniform wall thickness according to claim 9, characterized in that: The traction assembly (4) includes a ring frame (41) disposed on the frame (1), the ring frame (41) is provided with a drive wheel (42), the ring frame (41) is also provided with a motor that drives the drive wheel (42), the drive wheel (42) contacts the pipe cooled by the cooling assembly (3) and pulls the pipe, and a gap is formed between the drive wheel (42) and the support (532) for the pipe to pass through.

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