PVC-U pipe extrusion molding device capable of changing pipe diameter

Abstract

The utility model relates to the field of high polymer material processing equipment, and particularly discloses a pipe-diameter-variable PVC-U pipe extrusion molding device which comprises a mounting base, an extruder is arranged on the mounting base, a feeding pipe and a discharging pipe are arranged on the extruder, and a box body is arranged on the side, away from the extruder, of the discharging pipe; a plurality of groups of molds with different pipe diameters are fixedly arranged in the box body, a driving mechanism is arranged on the mounting base, and a sealing structure is arranged at the joint of the mold and the discharging pipe; when the mold needs to be replaced, the driving mechanism can firstly rotate the box body, the box body rotates to drive the mold to rotate and switch the mold, and the box body is horizontally moved after the mold with the needed pipe diameter is switched to, so that the mold is in butt joint with a discharging pipe on an extruder, and therefore, the molds with different pipe diameters can be rapidly switched; various production requirements can be met, and the production efficiency is improved; according to the sealing structure, the sealing performance when the discharging pipe is connected with the mold can be improved.

Description

TECHNICAL FIELD

[0001] The application relates to the field of polymer material processing equipment, in particular to a PVC-U pipe extrusion forming device with variable pipe diameter. BACKGROUND

[0002] The PVC-U pipe is a kind of hard plastic pipe material which is made of polyvinyl chloride resin as the main raw material, and modified materials such as stabilizers, lubricants and fillers, etc. after extrusion or injection molding. The PVC-U pipe has the characteristics of corrosion resistance, high impact strength, small fluid resistance and long service life. The PVC-U pipe extrusion forming device is a key equipment specially used for producing PVC-U pipe material. It converts PVC-U raw materials into high-performance pipe material through high-temperature melting, pressure extrusion and rapid setting processes. Its core function is to realize efficient plasticization and extrusion of materials, accurately control the structure and performance of the pipe material, and improve the production efficiency and energy saving level.

[0003] In the prior art, the PVC-U pipe extrusion forming device generally comprises an extruder, a cooling and setting assembly and a cutting assembly. The extruder is provided with an inlet pipe and an outlet pipe. The material enters the extruder through the inlet pipe for heating and melting, and is output through the outlet pipe. The cooling and setting assembly comprises a mold pipe. The material after heating and melting can enter the mold pipe, and the material is cooled and shaped by the cooling and setting assembly. Finally, the PVC-U pipe after shaping is segmented and cut by the cutting assembly.

[0004] For the related technology in the above, since the pipe diameter of the mold pipe that can be shaped is fixed, when different pipe diameters of PVC-U pipes need to be produced, the mold pipe as a whole needs to be disassembled and then replaced and installed. Therefore, the operation may be relatively complicated, the labor cost is increased, and the production efficiency is reduced. Content of the utility model

[0005] In order to quickly switch different molds with different pipe diameters, the application provides a PVC-U pipe extrusion forming device with variable pipe diameter.

[0006] The PVC-U pipe extrusion forming device with variable pipe diameter provided by the application adopts the following technical scheme:

[0007] A PVC-U pipe extrusion forming device with variable pipe diameter comprises a mounting base. The mounting base is provided with an extruder. The extruder is provided with an inlet pipe and an outlet pipe. The side of the outlet pipe away from the extruder is provided with a box. A plurality of groups of molds with different pipe diameters are fixedly arranged in the box. A cooling pipe for cooling and shaping the melted material is arranged on each group of molds. A driving mechanism for horizontally moving and rotating and switching the box is arranged on the mounting base. A sealing structure for improving the sealing performance of the connection between the outlet pipe and the mold is arranged at the connection between the mold and the outlet pipe.

[0008] By adopting the technical scheme, when the mold needs to be replaced, the driving mechanism can first rotate the box body, the box body drives the mold to rotate and switch, and after switching to the mold of the required pipe diameter, the box body is horizontally moved to make the mold butt joint with the discharge pipe, so that the mold of different pipe diameters can be quickly switched, various production requirements can be met, and production efficiency is improved; when the melted material enters the mold through the discharge pipe, the cooling pipe sleeved on the mold can cool and shape the melted material, and the sealing structure can improve the sealing performance when the discharge pipe is connected with the mold, and reduce leakage of the melted material at the connection between the discharge pipe and the mold.

[0009] Optionally, the driving mechanism comprises a U-shaped sliding seat, a driving motor, a rotating rod, a gear, a toothed ring and a moving assembly, the U-shaped sliding seat is slidingly arranged on the mounting base, the box body is rotationally arranged on the U-shaped sliding seat, the driving motor is arranged on the side wall of the U-shaped sliding seat, the rotating rod is rotationally arranged on the U-shaped sliding seat and penetrates the U-shaped sliding seat, one end of the rotating rod is arranged on the output end of the driving motor, the gear is sleeved on the rotating rod, the toothed ring is sleeved on the box body, and the gear and the toothed ring are meshed with each other, and the moving assembly is arranged on the mounting base and is used for horizontally moving the U-shaped sliding seat.

[0010] By adopting the technical scheme, the driving motor is started, the output end of the driving motor drives the rotating rod to rotate, and the rotating rod drives the gear, the toothed ring and the box body to rotate synchronously, so that the mold of different pipe diameters in the box body can be quickly rotated and switched.

[0011] Optionally, the moving assembly comprises an electric telescopic rod, a guide plate and a guide rail, the electric telescopic rod is arranged on the mounting base and located on the side of the U-shaped sliding seat away from the extruder, the telescopic end of the electric telescopic rod is arranged on the U-shaped sliding seat, the guide plate is arranged on the bottom of the U-shaped sliding seat, the guide rail is arranged on the mounting base, and the guide plate and the guide rail are slidingly connected.

[0012] By adopting the technical scheme, when the mold switching is completed, the electric telescopic rod is started, the telescopic end of the electric telescopic rod acts on the U-shaped sliding seat, and under the action of the guide plate and the guide rail, the U-shaped sliding seat synchronously drives the box body to horizontally move to the side of the discharge pipe, so that the switched mold can be butt jointed with the discharge pipe.

[0013] Optionally, the sealing structure comprises a docking pipe arranged at the end of the box body close to the extruder and communicated with the mold, and the annular groove for sealing docking of the docking pipe and the discharge pipe is arranged on the pipe wall of the discharge pipe away from the end of the extruder.

[0014] By using the above technical scheme, when the U-shaped sliding seat synchronously drives the box body to move horizontally to one side of the discharge pipe, the docking pipe can be inserted into the annular groove arranged on the pipe wall of the discharge pipe, so as to realize the sealing docking of the mold and the discharge pipe, improve the sealing performance when the discharge pipe is connected with the mold, and reduce the leakage of the melted material at the connection between the discharge pipe and the mold.

[0015] Optionally, a sealing ring is arranged on the inner bottom wall of the annular groove, and the sealing ring is in movable abutment with the docking pipe.

[0016] By using the above technical scheme, the docking pipe is inserted into the annular groove arranged on the pipe wall of the discharge pipe and abuts against the sealing ring, and the sealing ring can further improve the sealing performance when the discharge pipe is connected with the mold, and can also reduce the collision force when the docking pipe is docked with the discharge pipe, thereby reducing the damage caused by the collision between the docking pipe and the discharge pipe.

[0017] Optionally, a ball head for uniformly entering the melted material into the mold is arranged at the end of the docking pipe close to the mold.

[0018] By using the above technical scheme, the ball head arranged at the end of the docking pipe close to the mold can uniformly enter the melted material into the mold, and can also smoothly guide the melted material into the mold, thereby reducing the frictional resistance between the melted material and the end of the mold.

[0019] Optionally, a plurality of groups of rollers for reducing the frictional force between the guide plate and the guide rail are rotatably arranged in the guide rail along the length direction.

[0020] By using the above technical scheme, the plurality of groups of rollers arranged in the guide rail can reduce the frictional force between the guide plate and the guide rail, thereby reducing the frictional loss between the guide plate and the guide rail and reducing the energy consumption of the electric telescopic rod.

[0021] Optionally, a heat preservation sleeve is sleeved on the outer peripheral wall of the cooling pipe.

[0022] By using the above technical scheme, the heat preservation sleeve sleeved on the outer peripheral wall of the cooling pipe can reduce the absorption of external heat by the cooling pipe, thereby ensuring the cooling effect of the cooling pipe.

[0023] In summary, the present application has at least one of the following beneficial technical effects:

[0024] 1. The driving mechanism in the application can move the box horizontally and rotate it. Start the driving motor, and the output end of the driving motor drives the rotating rod to rotate. The rotating rod drives the gear, ring gear and box to rotate through the rotating synchronous belt, so as to switch the molds of different pipe diameters in the box. After the mold switching is completed, start the electric telescopic rod, and the telescopic end of the electric telescopic rod acts on the U-shaped sliding seat, and under the action of the guide plate and the guide rail, the U-shaped sliding seat synchronously drives the box to move horizontally to one side of the discharge pipe, so as to butt joint the switched mold and the discharge pipe, and then realize the switching and butt joint of the mold of different pipe diameters, which can meet various production requirements and improve the production efficiency.

[0025] 2. The sealing structure in the application can improve the sealing performance when the discharge pipe is connected with the mold. When the U-shaped sliding seat synchronously drives the box to move horizontally to one side of the discharge pipe, the butt joint pipe can be inserted into the annular groove formed in the wall of the discharge pipe, so as to realize the sealed butt joint of the mold and the discharge pipe, improve the sealing performance when the discharge pipe is connected with the mold, and reduce the leakage of the melted material at the connection between the discharge pipe and the mold. The butt joint pipe is inserted into the annular groove formed in the wall of the discharge pipe and abuts against the sealing ring, the sealing ring can further improve the sealing performance when the discharge pipe is connected with the mold, and can also reduce the collision force when the butt joint pipe is butt jointed with the discharge pipe, and reduce the damage caused by the collision between the butt joint pipe and the discharge pipe. BRIEF DESCRIPTION OF DRAWINGS

[0026] In order to more clearly illustrate the technical solutions in the embodiments of the application, the drawings needed in the embodiment description will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the application, and other drawings can be obtained by those skilled in the art without creative labor.

[0027] Figure 1 is a schematic diagram of the overall structure of the embodiment of the application;

[0028] Figure 2 is a schematic diagram of the cross-sectional structure of Figure 1 ;

[0029] Figure 3 is another schematic diagram of the cross-sectional structure;

[0030] Figure 4 is an enlarged schematic diagram of part A in Figure 2 .

[0031] 1, mounting base; 2, extruder; 21, feeding pipe; 22, discharging pipe; 3, box body; 31, mold; 311, cooling pipe; 312, heat preservation sleeve; 4, driving mechanism; 41, U-shaped sliding seat; 42, driving motor; 43, gear; 44, rotating rod; 45, gear ring; 5, sealing structure; 51, butt joint pipe; 511, ball head; 52, annular groove; 521, sealing ring; 6, moving assembly; 61, electric telescopic rod; 62, guide plate; 63, guide rail; 631, roller. DETAILED DESCRIPTION

[0032] The following will be described in detail in combination with the accompanying Figures 1-4 The application is further described in detail.

[0033] The PVC-U pipe extrusion molding device with variable pipe diameter disclosed by the embodiments of the application is described below with reference to the accompanying Figure 1 and Figure 2 , comprising a mounting base 1, a fixedly installed extruder 2 on the mounting base 1, a fixedly installed feeding pipe 21 and discharging pipe 22 on the extruder 2, a box body 3 installed on the side of the discharging pipe 22 away from the extruder 2, a plurality of groups of different pipe diameter molds 31 fixedly installed in the box body 3, a cooling pipe 311 sleeved on each of the plurality of groups of molds 31, a driving mechanism 4 installed on the mounting base, and a sealing structure 5 arranged at the connection between the mold 31 and the discharging pipe 22.

[0034] When the mold 31 needs to be replaced, the driving mechanism 4 in the embodiments can first rotate the box body 3, the box body 3 drives the mold 31 to rotate and switch, and after switching to the mold 31 with the required pipe diameter, the box body 3 is horizontally moved, so that the mold 31 is butt jointed with the discharging pipe 22, thereby realizing the quick switching of the mold 31 with different pipe diameters, meeting various production requirements, and improving the production efficiency; when the melted material enters into the mold 31 through the discharging pipe 22, the cooling pipe 311 sleeved on the mold 31 can cool and shape the melted material, and in addition, the sealing structure 5 in the embodiments can improve the sealing performance when the discharging pipe 22 is connected with the mold 31, and reduce the leakage of the melted material at the connection between the discharging pipe 22 and the mold 31.

[0035] The following will be described in detail in combination with the accompanying Figure 1 and Figure 3To realize the quick rotation switching of the molds 31 with different pipe diameters, the driving mechanism 4 in this embodiment comprises a U-shaped sliding seat 41, a driving motor 42, a gear 43, a rotating rod 44, a tooth ring 45 and a moving assembly 6, the U-shaped sliding seat 41 is slidingly installed on the mounting base 1, the box body 3 is rotatably installed on the U-shaped sliding seat 41, the driving motor 42 is fixedly installed on the side wall of the U-shaped sliding seat 41, the rotating rod 44 is rotatably installed on the U-shaped sliding seat 41 and penetrates through the U-shaped sliding seat 41, one end of the rotating rod 44 is fixedly installed on the output end of the driving motor 42, the gear 43 is sleeved on the rotating rod 44, the tooth ring 45 is sleeved on the box body 3, and the gear 43 and the tooth ring 45 are meshed with each other, and the moving assembly 6 is installed on the mounting base 1.

[0036] The driving motor 42 is started, the output end of the driving motor 42 drives the rotating rod 44 to rotate, the rotating rod 44 drives the gear 43, the tooth ring 45 and the box body 3 to rotate synchronously through the rotating synchronous belt, so as to realize the quick rotation switching of the molds 31 with different pipe diameters in the box body 3; the gears 43 and the tooth rings 45 in this embodiment are both provided with two groups, the two groups of gears 43 are fixedly installed on the two ends of the rotating rod 44, the two groups of tooth rings 45 are fixedly installed on the two ends of the box body 3, and the two groups of gears 43 are meshed with the two groups of tooth rings 45, respectively.

[0037] With reference to Figure 3 , the template after rotation switching needs to be connected with the discharge pipe 22, therefore, the moving assembly 6 in this embodiment comprises an electric telescopic rod 61, a guide plate 62 and a guide rail 63, the electric telescopic rod 61 is fixedly installed on the mounting base 1 and located on the side of the U-shaped sliding seat 41 away from the extruder 2, the telescopic end of the electric telescopic rod 61 is fixedly installed on the U-shaped sliding seat 41, the guide plate 62 is fixedly installed on the bottom of the U-shaped sliding seat 41, the guide rail 63 is fixedly installed on the mounting base 1, and the guide plate 62 and the guide rail 63 are slidingly connected.

[0038] The electric telescopic rod 61 is started, the telescopic end of the electric telescopic rod 61 acts on the U-shaped sliding seat 41, under the action of the guide plate 62 and the guide rail 63, the U-shaped sliding seat 41 synchronously drives the box body 3 to move horizontally to the side of the discharge pipe 22, so as to realize the connection of the switched mold 31 and the discharge pipe 22; the guide plate 62 and the guide rail 63 in this embodiment are both symmetrically installed with two groups, and the two groups are a preferred mode in this embodiment, and other groups can also be provided.

[0039] With reference to Figure 4, the molten material may leak when the mold 31 directly interfaces with the discharge pipe 22, therefore the sealing structure 5 in the embodiment comprises a butt joint pipe 51 welded to the end of the box body 3 close to the extruder 2 and in communication with the mold 31, and an annular groove 52 is formed in the pipe wall of the discharge pipe 22 away from the end of the extruder 2; when the U-shaped sliding seat 41 synchronously drives the box body 3 to move horizontally to one side of the discharge pipe 22, the butt joint pipe 51 can be inserted into the annular groove 52 formed in the pipe wall of the discharge pipe 22, so as to realize the sealed interface of the mold 31 and the discharge pipe 22, improve the sealing performance when the discharge pipe 22 is connected with the mold 31, and reduce the leakage of the molten material at the connection between the discharge pipe 22 and the mold 31.

[0040] With reference to Figure 4 , in order to further improve the sealing performance when the discharge pipe 22 is connected with the mold 31, the inner bottom wall of the annular groove 52 in the embodiment is fixedly installed with a sealing ring 521, the butt joint pipe 51 is inserted into the annular groove 52 formed in the pipe wall of the discharge pipe 22 and abuts against the sealing ring 521, the sealing ring 521 can improve the sealing performance when the discharge pipe 22 is connected with the mold 31, and also can reduce the collision force when the butt joint pipe 51 interfaces with the discharge pipe 22, so as to reduce the damage caused by the collision between the butt joint pipe 51 and the discharge pipe 22; the sealing ring 521 in the embodiment is made of silica gel, which is a preferred mode in the embodiment, and can also be made of ceramic fiber pad and the like.

[0041] With reference to Figure 4 , the molten material in the discharge pipe 22 directly enters the mold 31, which may cause uneven distribution of the material or blockage of the material entering the end of the mold 31, therefore the end of the butt joint pipe 51 close to the mold 31 in the embodiment is fixedly installed with a ball head 511, the ball head 511 can make the molten material evenly enter the mold 31, and also can smoothly guide the molten material into the mold 31, so as to reduce the friction resistance between the molten material and the end of the mold 31; the mold 31 in the embodiment is provided with a hollow molding pipe, one end of the molding pipe is connected with the ball head 511, and the molding pipe is a polyamide pipe material with light weight and high temperature resistance, and can also be a magnesium oxide-based composite heat-resistant pipe material and the like.

[0042] With reference to Figure 3 , the friction force between the guide plate 62 and the guide rail 63 is relatively large when they directly slide, in order to reduce the friction force between the guide plate 62 and the guide rail 63, a plurality of groups of rollers 631 are rotatably installed in the guide rail 63 along the length direction, the plurality of groups of rollers 631 can reduce the friction force between the guide plate 62 and the guide rail 63, so as to reduce the friction loss between the guide plate 62 and the guide rail 63 and the use energy consumption of the electric telescopic rod 61.

[0043] With reference to Figure 2The cooling cylinder is directly in contact with the external environment, which can reduce the cooling effect of the cooling cylinder. Therefore, the outer peripheral wall of the cooling pipe 311 in the embodiment is sleeved with a heat preservation sleeve 312. The heat preservation sleeve 312 can reduce the absorption of external heat by the cooling pipe 311, thereby ensuring the cooling effect of the cooling pipe 311. The heat preservation sleeve 312 in the embodiment is a rock wool heat preservation sleeve 312. The rock wool heat preservation sleeve 312 is a preferred mode in the embodiment, and can also be a glass wool heat preservation sleeve 312 and the like.

[0044] The implementation principle of the PVC-U pipe extrusion molding device with variable pipe diameter in the embodiment is as follows:

[0045] The driving motor 42 is started, the output end of the driving motor 42 drives the rotating rod 44 to rotate, the rotating rod 44 drives the gear 43, the gear ring 45 and the box body 3 to rotate through the rotating synchronous belt, so as to switch the different pipe diameter molds 31 in the box body 3. When the mold 31 is switched, the electric telescopic rod 61 is started, the telescopic end of the electric telescopic rod 61 acts on the U-shaped sliding seat 41, and under the action of the guide plate 62 and the guide rail 63, the U-shaped sliding seat 41 synchronously drives the box body 3 to move horizontally to one side of the discharge pipe 22, so as to butt joint the switched mold 31 and the discharge pipe 22, thereby realizing the quick switching and butt joint of different pipe diameter molds 31, meeting various production requirements and improving the production efficiency.

[0046] When the U-shaped sliding seat 41 synchronously drives the box body 3 to move horizontally to one side of the discharge pipe 22, the butt joint pipe 51 can be inserted into the annular groove 52 formed in the wall of the discharge pipe 22, so as to realize the sealed butt joint of the mold 31 and the discharge pipe 22, improve the sealing performance when the discharge pipe 22 and the mold 31 are connected, and reduce the leakage of the melted material at the connection between the discharge pipe 22 and the mold 31. The butt joint pipe 51 is inserted into the annular groove 52 formed in the wall of the discharge pipe 22 and abuts against the sealing ring 521. The sealing ring 521 can further improve the sealing performance when the discharge pipe 22 and the mold 31 are connected, and can also reduce the collision force when the butt joint pipe 51 and the discharge pipe 22 are butt jointed, thereby reducing the damage caused by the collision between the butt joint pipe 51 and the discharge pipe 22.

[0047] Unless otherwise defined, technical terms or scientific terms used in the present application shall have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. Unless otherwise defined, the terms "first", "second" or "third" and the like in the description and in the claims, are used for distinguishing between similar elements and not necessarily for describing a sequential or chronological order. The terms "one", "another", "an" or "some" as well as similar referents in the context of describing the specification and claims are to be construed to be open-ended, i.e., to cover both singular and plural referents unless otherwise indicated. The terms "including", "containing" or "comprising" and the like are not intended to exclude other integers or steps, but to "include" or "comprise" other integers or steps unless otherwise indicated. The terms "connected", "coupled" or "pathway" and the like are not limited to direct connections, couplings or pathways, but can also include indirect connections, couplings or pathways unless otherwise indicated.

[0048] The above are all optional embodiments of the present application, and do not limit the protection scope of the present application, therefore: any equivalent changes made according to the structure, shape, principle of the present application should be covered within the protection scope of the present application.

Claims

1. A PVC-U pipe extrusion forming device with variable pipe diameter, comprising a mounting base (1), characterized in that: The installation base (1) is provided with an extruder (2), the extruder (2) is provided with a feeding pipe (21) and a discharging pipe (22), the discharging pipe (22) is provided with a box (3) away from one side of the extruder (2), a plurality of groups of different pipe diameters of the mold (31) are fixedly arranged in the box (3), a plurality of groups of the mold (31) are all provided with a cooling pipe (311) for cooling and shaping the molten material, the installation base is provided with a driving mechanism (4) for horizontally moving and rotating the box (3), and the mold (31) is provided with a sealing structure (5) for improving the sealing performance of the connection between the discharging pipe (22) and the mold (31).

2. A PVC-U pipe extrusion forming device with variable pipe diameter according to claim 1, characterized in that: The driving mechanism (4) comprises a U-shaped sliding seat (41), a driving motor (42), a rotating rod (44), a gear (43), a gear ring (45) and a moving assembly (6), the U-shaped sliding seat (41) is slidably arranged on the installation base (1), the box (3) is rotatably arranged on the U-shaped sliding seat (41), the driving motor (42) is arranged on the side wall of the U-shaped sliding seat (41), the rotating rod (44) is rotatably arranged on the U-shaped sliding seat (41) and penetrates the U-shaped sliding seat (41), one end of the rotating rod (44) is arranged on the output end of the driving motor (42), the gear (43) is arranged on the rotating rod (44), the gear ring (45) is arranged on the box (3), and the gear (43) and the gear ring (45) are meshed with each other, and the moving assembly (6) is arranged on the installation base (1) and is used for horizontally moving the U-shaped sliding seat (41).

3. A PVC-U pipe extrusion forming device with variable pipe diameter according to claim 2, characterized in that: The moving assembly (6) comprises an electric telescopic rod (61), a guide plate (62) and a guide rail (63), the electric telescopic rod (61) is arranged on the installation base (1) and located away from one side of the U-shaped sliding seat (41) relative to the extruder (2), the telescopic end of the electric telescopic rod (61) is arranged on the U-shaped sliding seat (41), the guide plate (62) is arranged on the bottom of the U-shaped sliding seat (41), the guide rail (63) is arranged on the installation base (1), and the guide plate (62) and the guide rail (63) are slidably connected.

4. A PVC-U pipe extrusion forming device with variable pipe diameter as claimed in claim 1, characterized in that: The sealing structure (5) comprises a butt joint pipe (51), the butt joint pipe (51) is arranged on the end of the box (3) close to the extruder (2) and communicates with the mold (31), and an annular groove (52) for sealingly connecting the butt joint pipe (51) and the discharging pipe (22) is formed in the pipe wall of the discharging pipe (22) away from the extruder (2).

5. A PVC-U pipe extrusion forming apparatus with variable pipe diameter according to claim 4, characterized in that: A sealing ring (521) is arranged on the inner bottom wall of the annular groove (52), and the sealing ring (521) is in movable abutment with the butt joint pipe (51).

6. A PVC-U pipe extrusion forming apparatus with variable pipe diameter as claimed in claim 4 wherein: The end of the butt joint pipe (51) close to the mold (31) is provided with a ball head (511) for uniformly feeding the molten material into the mold (31).

7. A PVC-U pipe extrusion forming device with variable pipe diameter according to claim 3, characterized in that: A plurality of groups of rollers (631) for reducing the friction between the guide plate (62) and the guide rail (63) are arranged in the guide rail (63) and rotate along the length direction.

8. A PVC-U pipe extrusion forming device with variable pipe diameter according to claim 1, characterized in that: An outer peripheral wall of the cooling pipe (311) is sleeved with a heat preservation sleeve (312).

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