CPVC (Chlorinated Polyvinyl Chloride) pipeline extrusion die with composite runner

Abstract

The invention belongs to the technical field of CPVC (chlorinated polyvinyl chloride) pipeline processing, and discloses a CPVC pipeline extrusion die with a composite runner, which comprises an extruder and a die mechanism mounted on the extruder, and further comprises an adjusting assembly arranged in the die mechanism; the bolt assembly is installed on the die mechanism and used for driving the adjusting assembly to move in the axial direction. According to the scheme, after an extruder is stopped firstly, an operator rotates a bolt body to drive a first convex shaft to move downwards in a chute through a U-shaped piece, then a sleeve rod is pushed to move to block the inner end of a first runner, meanwhile, movement of the sleeve rod can drive a mold core rod and a connecting piece to move, and then a mold head cavity communicates with a second runner through a material flowing pipe; and the extruder is operated after the adjustment is finished, so that the downtime of the extruder is shortened, the adjustment efficiency is improved, and the problem that the pipeline extrusion efficiency is reduced due to long-time downtime of equipment when the extrusion die head of the extruder is replaced is solved.

Description

Technical Field

[0001] The invention belongs to the technical field of CPVC pipe processing, in particular to a CPVC pipe extrusion die with a composite flow channel. Background Art

[0002] CPVC (chlorinated polyvinyl chloride) pipes are high-performance plastic pipes made from PVC (polyvinyl chloride) resins that have been modified by chlorination. The raw materials are added to a high-speed mixer in proportion and then melt-mixed in a twin-screw extruder. Finally, the molten material is extruded through a die head to form the product.

[0003] In the actual production process of CPVC pipes, the die head needs to be replaced according to the pipe diameter. For each production of CPVC pipes with different diameters, the operator needs to spend a lot of time to disassemble and install the die. During the process of disassembling and installing the die, the equipment needs to be shut down for a long time, which reduces the efficiency of pipe production. In addition, the new die head needs to be debugged after installation, which further increases the downtime of the equipment and invisibly increases the production cost.

[0004] Therefore, in order to solve the above problems, a CPVC pipe extrusion die with a composite flow channel is proposed. Summary of the invention

[0005] In order to solve the problems raised in the above background technology, the present invention provides a CPVC pipe extrusion die with a composite flow channel, which solves the problem that the extruder will cause the equipment to shut down for a long time and reduce the pipe extrusion efficiency when replacing the extrusion die head.

[0006] To achieve the above-mentioned object, the present invention provides the following technical solutions: a CPVC pipe extrusion die with a composite flow channel, comprising an extruder and a die mechanism mounted thereon, and further comprising: an adjustment component, which is arranged inside the die mechanism; a bolt component, which is mounted on the die mechanism and is used to drive the adjustment component to move axially; the die mechanism comprises a pipe 2 and a pipe 1 and a die head connected to both ends thereof, wherein an isolation pipe is fixedly connected inside the pipe 1; The first pipe is provided with a flow channel 1, and the first flow channel and the second flow channel can be connected to the inner cavity of the die head; The adjustment assembly comprises a sleeve rod movably sleeved in the isolation tube, an inclined groove is provided on the inner wall of the sleeve rod, a core rod is movably sleeved in the sleeve rod, one end of the core rod is connected to the pipe one by a bearing, and the other end thereof extends into the flow channel one, a connecting piece is fixedly sleeved on the outside of the core rod, a flow pipe that can be connected to the flow channel two is fixedly connected in an annular array on the connecting piece, and a column that can block the flow pipe is fixedly connected in the die head; The second channel cavity forms a first passage through the die head cavity and the flow channel one; The second channel cavity forms a second passage with the second flow channel through the die head cavity and the flow pipe.

[0007] Preferably, the inner diameters of the pipe 1 and the pipe 2 are both larger than the die head, and a heating wire is provided in the mold mechanism.

[0008] Preferably, the bolt assembly comprises a bolt body, a U-shaped member and a convex shaft 1, wherein the bolt body is threadedly connected to the isolation tube, one end of which extends to the outside of the mold mechanism through the isolation tube, the U-shaped member is bearing-connected to the bottom of the bolt body, one end of the convex shaft 1 is fixedly connected to the U-shaped member, and the other end can slide in the inclined groove; In the initial state, one end of the U-shaped piece is located at the top of the inclined slot.

[0009] Preferably, the core rod is provided with an arc-shaped groove located inside the sleeve rod, and the sleeve rod is fixedly connected with a convex shaft 2 which slides in the arc-shaped groove.

[0010] Preferably, a tension spring assembly tube is sleeved in the die head, and the tension spring assembly tube is also located in the second flow channel; elastic extrusion pieces are arranged in a circular array on the tension spring assembly tube; A plurality of push rods are fixedly connected in an annular array on the connecting member, and one end of the push rods can extend into the tension spring assembly tube and abut against the elastic extrusion member; The tension spring assembly tube has a tendency to move toward the inside of the die head under its own tension, and the push rod can push the tension spring assembly tube to move in the axial direction through the elastic extrusion piece.

[0011] Preferably, a slope is provided in the die head as the inner surface of the second flow channel, one end of the tension spring assembly tube is located inside the slope, and is used to isolate the connection between one end of the tension spring assembly tube and the second flow channel when the tension spring assembly tube moves.

[0012] Preferably, the elastic extrusion piece is elastically connected to the interior of the tension spring assembly tube, and the elastic extrusion piece is provided with an outlet, an inclined surface, a reset opening and a straight slot; The push rod is provided with an elastic convex shaft that can slide in the straight slot at one end close to the elastic extrusion piece. The elastic convex shaft is initially located inside the straight slot and its height is between the outlet and the reset port. When the elastic extrusion piece rotates around the axis, its end can be tilted and extend into the second flow channel; The elastic convex shaft can slide in the straight notch to make the elastic extrusion piece rotate and escape from the straight notch through the outlet, so that the tension spring assembly tube is driven by its own tension force to reset the elastic extrusion piece; The elastic convex shaft is compressed and force is accumulated when it is reset and moves along the inclined surface, and enters the straight groove through the reset opening.

[0013] Preferably, the side of the elastic extrusion piece facing the second flow channel is an arc surface, and when the elastic extrusion piece is cut along the arc surface and the die head in a direction perpendicular to the axial direction of the die head, the obtained cross-sectional edge is circular.

[0014] Compared with the prior art, the present invention has the following beneficial effects: In the above scheme, after the extruder is stopped first, the operator rotates the bolt body to drive the convex shaft 1 downward in the inclined groove through the U-shaped piece, thereby pushing the sleeve rod to move to block the inner end of the flow channel 1, that is, the first passage is blocked. At the same time, the movement of the sleeve rod also drives the core rod and the connecting piece to move, thereby connecting the die head cavity with the flow channel 2 through the flow pipe, that is, the second passage is connected. After the adjustment is completed, the extruder is operated, thereby reducing the downtime of the extruder and improving the adjustment efficiency, and solving the problem that the extruder will cause the equipment to stop for a long time when replacing the extrusion die head, thereby reducing the pipeline extrusion efficiency. The above scheme also causes the elastic extrusion member to push the tension spring combination tube to move through the movement of the connecting member, thereby preventing the residual material remaining in the second flow channel and in contact with the outside world from solidifying and adhering to the outer wall of the die head and affecting the extrusion of the pipe. When the sleeve rod is reset in the reverse direction, the first flow channel will be conducted and the second flow channel will be blocked. During this process, the sleeve rod will drive the convex shaft 2 to slide in the arc groove and force the core rod to rotate, thereby preventing the residual material in the first flow channel and in contact with the outside world from solidifying and adhering to the core rod and affecting the extrusion of the pipe. The above scheme can drive the elastic cam to slide downward in the straight slot through the push rod, which can push the elastic extrusion part to rotate around the axis, so that the elastic extrusion part can tilt up and squeeze the residual material in the second flow channel, thereby avoiding the slipping of the tension spring combination tube when pushing out the residual material. When the elastic cam is separated from the straight slot at the outlet, the tension spring combination tube and the elastic extrusion part are reset by their own tension and elastic force respectively. When the pipe diameter is adjusted again, the push rod needs to drive the elastic cam to move in the opposite direction. At this time, the elastic cam will move upward along the inclined surface and enter the straight slot through the reset port to complete the reset. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of the installation structure of the present invention; Figure 2 It is a schematic diagram of the overall structure of the present invention; Figure 3 It is a front cross-sectional structural schematic diagram of the mold mechanism of the present invention; Figure 4 A plan perspective view of the adjustment assembly of the present invention; Figure 5 It is a partial cross-sectional structural schematic diagram of the sleeve rod of the present invention; Figure 6 It is a front cross-sectional structural schematic diagram of the present invention; Figure 7 for Figure 6 The enlarged view of point A in the middle; Figure 8 It is a schematic structural diagram of the elastic extrusion part of the present invention.

[0016] In the figure: 1. extruder; 2. mold mechanism; 21. pipeline 1; 211. isolation tube; 22. pipeline 2; 23. die head; 231. flow channel 1; 232. flow channel 2; 233. column; 234. slope; 3. bolt assembly; 31. bolt body; 32. U-shaped part; 33. cam 1; 4. adjustment assembly; 41. sleeve rod; 411. inclined groove; 412. cam 2; 42. core rod; 421. arc groove; 43. connector; 431. ejector rod; 4311. elastic cam; 44. flow tube; 5. tension spring combination tube; 6. elastic extrusion member; 61. outlet; 62. inclined surface; 63. reset port; 64. straight slot. DETAILED DESCRIPTION

[0017] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0018] like Figures 1 to 8 As shown, the present invention provides a CPVC pipe extrusion die with a composite flow channel, including an extruder 1 and a die mechanism 2 mounted thereon, and also includes: an adjustment component 4, which is arranged inside the die mechanism 2; a bolt component 3, which is mounted on the die mechanism 2 and is used to drive the adjustment component 4 to move axially; The mold mechanism 2 includes a pipe 22 and a pipe 1 21 and a die head 23 connected at both ends thereof, and an isolation pipe 211 is fixedly connected in the pipe 1 21; A flow channel 1 231 is provided in the pipe 1 21, and both the flow channel 1 231 and the flow channel 2 232 can be connected to the inner cavity of the die head 23; The adjusting assembly 4 comprises a sleeve rod 41 movably sleeved in the isolation tube 211, an inclined groove 411 is arranged on the inner wall of the sleeve rod 41, a core rod 42 is movably sleeved in the sleeve rod 41, one end of the core rod 42 is connected to the pipe 1 21 by a bearing, and the other end thereof extends into the flow channel 1 231, a connecting piece 43 is fixedly sleeved on the outside of the core rod 42, a flow pipe 44 which can communicate with the flow channel 2 232 is fixedly connected to the connecting piece 43 in an annular array, and a column 233 which can block the flow pipe 44 is fixedly connected in the die head 23; The cavity of the second pipeline 22 forms a first passage with the first flow channel 231 through the cavity of the die head 23; the cavity of the second pipeline 22 forms a second passage with the second flow channel 232 through the cavity of the die head 23 and the flow pipe 44; The inner diameters of the pipe 1 21 and the pipe 2 22 are both larger than the die head 23, and a heating wire is provided in the die mechanism 2; The bolt assembly 3 includes a bolt body 31, a U-shaped member 32 and a protruding shaft 33. The bolt body 31 is threadedly connected to the isolation tube 211, and one end thereof extends to the outside of the mold mechanism 2 through the isolation tube 211. The U-shaped member 32 is bearing-connected to the bottom of the bolt body 31. One end of the protruding shaft 33 is fixedly connected to the U-shaped member 32, and the other end thereof can slide in the inclined groove 411. In the initial state, one end of the U-shaped member 32 is located at the top of the inclined slot 411; By adopting the above scheme, after stopping the extruder 1 first, the operator rotates the bolt body 31 to drive the convex shaft 33 downward in the inclined groove 411 through the U-shaped part 32, and then pushes the sleeve rod 41 to move to block the inner end of the flow channel 1 231, that is, the first passage is blocked. At the same time, the movement of the sleeve rod 41 will also drive the core rod 42 and the connecting part 43 to move, so that the cavity of the die head 23 is connected with the flow channel 2 232 through the flow pipe 44, that is, the second passage is connected. After the adjustment is completed, the extruder 1 is operated, thereby reducing the downtime of the extruder 1 and improving the adjustment efficiency, and solving the problem that the extruder 1 will cause the equipment to be shut down for a long time when replacing the extrusion die head, thereby reducing the pipeline extrusion efficiency.

[0019] like Figure 2-Figure 7 As shown, the core rod 42 is provided with an arc-shaped groove 421 located in the sleeve rod 41, and the sleeve rod 41 is fixedly connected with a convex shaft 412 sliding in the arc-shaped groove 421; A tension spring assembly tube 5 is also sleeved in the die head 23, and the tension spring assembly tube 5 is also located in the second flow channel 232; elastic extrusion members 6 are arranged in an annular array on the tension spring assembly tube 5; A plurality of push rods 431 are fixedly connected in an annular array on the connecting member 43, one end of the push rod 431 can extend into the tension spring assembly tube 5 and abut against the elastic extrusion member 6; The tension spring assembly tube 5 has a tendency to move toward the die head 23 due to its own tension, and the push rod 431 can push the tension spring assembly tube 5 to move in the axial direction through the elastic extrusion member 6; The die head 23 is also provided with a slope 234 as the inner surface of the second flow channel 232. One end of the tension spring assembly tube 5 is located inside the slope 234, and is used to isolate the communication between the one end of the tension spring assembly tube 5 and the second flow channel 232 when the tension spring assembly tube 5 moves. By adopting the above scheme, the elastic extrusion member 6 will push the tension spring combination tube 5 to move through the movement of the connecting member 43, thereby preventing the residual material remaining in the second flow channel 232 and in contact with the outside from solidifying and adhering to the outer wall of the die head 23 and affecting the extrusion of the pipe, and when the sleeve rod 41 is reversely reset, the flow channel 1 231 will be conducted and the flow channel 2 232 will be blocked. In this process, the sleeve rod 41 will drive the convex shaft 2 412 to slide in the arc groove 421 and force the core rod 42 to rotate, thereby preventing the residual material in the flow channel 1 231 and in contact with the outside from solidifying and adhering to the core rod 42 and affecting the extrusion of the pipe. It is worth noting that the residual material will also adhere to the outer wall of the flow channel 1 231 and the outer wall of the flow channel 2 232. However, since the horizontal parts of the inner wall of the flow channel 1 231 are the outer wall of the mold core rod 42 and are located inside the flow channel 1 231, and the horizontal parts of the inner wall of the flow channel 2 232 are the outer wall of the tension spring combination tube 5, when the mold core rod 42 rotates circumferentially and the tension spring combination tube 5 moves axially, the residual material can be prevented from adhering to the tension spring combination tube 5 and the mold core rod 42. When extruding subsequently, the extrusion force only needs to overcome the force of the residual material adhering to the outer wall of the flow channel 2 232 or the outer wall of the flow channel 1 231, thereby avoiding the situation where the pressure in the flow channel 1 231 and the flow channel 2 232 increases to extrude the residual material and cause the residual material to spray out during extrusion. At the same time, after the residual material is extruded, the operator also needs to scrape it off with a scraper.

[0020] like Figure 2-Figure 8 As shown, the elastic extrusion member 6 is elastically connected to the interior of the tension spring assembly tube 5, and the elastic extrusion member 6 is provided with an outlet 61, an inclined surface 62, a reset port 63 and a straight slot 64; An elastic convex shaft 4311 that can slide in the straight slot 64 is disposed at one end of the ejector pin 431 close to the elastic extrusion member 6. The elastic convex shaft 4311 is initially located inside the straight slot 64 and at a height between the outlet 61 and the reset port 63. When the elastic extrusion member 6 rotates around the axis, its end can be tilted and extend to the inside of the second flow channel 232. The elastic convex shaft 4311 can slide in the straight notch 64 to rotate the elastic extrusion member 6 and escape from the straight notch 64 through the outlet 61, so that the tension spring assembly tube 5 can drive the elastic extrusion member 6 to reset due to its own tension; The elastic convex shaft 4311 is compressed and stored when it moves along the inclined surface 62 to reset, and enters the straight groove 64 through the reset opening 63; The side of the elastic extrusion member 6 facing the second flow channel 232 is a curved surface. When the elastic extrusion member 6 is cut along the direction perpendicular to the axial direction of the die head 23 and the die head 23, the cross-sectional edge obtained is circular, thereby ensuring that the inner wall of the extruded pipe is smooth; By adopting the above scheme, the push rod 431 can drive the elastic convex shaft 4311 to slide downward in the straight slot 64, which can push the elastic extrusion member 6 to rotate around the axis, so that the elastic extrusion member 6 can tilt up and squeeze the residual material in the second flow channel 232, thereby avoiding the tension spring combination tube 5 from slipping when pushing out the residual material. When the elastic convex shaft 4311 is separated from the straight slot 64 at the outlet 61, the tension spring combination tube 5 and the elastic extrusion member 6 are reset by their own tension and elastic force respectively. When the pipe diameter is adjusted again, the push rod 431 needs to drive the elastic convex shaft 4311 to move in the opposite direction. At this time, the elastic convex shaft 4311 will go up along the inclined surface 62 and enter the straight slot 64 through the reset port 63 to complete the reset. It is worth mentioning that the operator can lengthen the raised end of the elastic extrusion piece 6 and shorten the collapsed end of the elastic extrusion piece 6, thereby avoiding the situation where the pressure extruded from the mold after the elastic cam 4311 is separated from the straight slot 64 will squeeze the elastic extrusion piece 6 to rotate around the axis.

[0021] The working principle and use process of the present invention: When the pipe diameter needs to be adjusted, the extruder 1 is stopped first, and then the operator rotates the bolt body 31 to drive the convex shaft 1 33 downward in the inclined groove 411 through the U-shaped member 32, thereby pushing the sleeve rod 41 to move and block the inner end of the flow channel 1 231. At the same time, the movement of the sleeve rod 41 will also drive the core rod 42 and the connecting member 43 to move, thereby connecting the cavity of the die head 23 with the flow channel 2 232 through the flow pipe 44. After the adjustment is completed, the extruder 1 is operated; The movement of the connecting member 43 will also push the tension spring combination tube 5 to move through the elastic extrusion member 6, thereby preventing the residual material remaining in the second flow channel 232 and in contact with the outside from solidifying and adhering to the outer wall of the die head 23 and affecting the extrusion of the pipe, and when the sleeve rod 41 is reversed and reset, the flow channel 1 231 will be conducted and the flow channel 2 232 will be blocked. In this process, the sleeve rod 41 will drive the convex shaft 2 412 to slide in the arc groove 421 and force the core rod 42 to rotate, thereby preventing the residual material in the flow channel 1 231 and in contact with the outside from solidifying and adhering to the core rod 42 and affecting the extrusion of the pipe. The push rod 431 can slide downward in the straight slot 64 through the elastic convex shaft 4311 to push the elastic extrusion piece 6 to rotate around the axis, so that the elastic extrusion piece 6 can tilt up and squeeze the residual material in the flow channel 232, thereby avoiding the tension spring combination tube 5 from slipping when pushing out the residual material. When the elastic convex shaft 4311 disengages from the straight slot 64 at the outlet 61, the tension spring combination tube 5 and the elastic extrusion piece 6 are reset by their own tension and elastic force respectively. When the pipe diameter is adjusted again, the push rod 431 needs to drive the elastic convex shaft 4311 to move in the opposite direction. At this time, the elastic convex shaft 4311 will go up along the inclined surface 62 and enter the straight slot 64 through the reset port 63 to complete the reset.

[0022] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0023] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A CPVC pipe extrusion die with a composite flow channel, comprising an extruder (1) and a die mechanism (2) mounted thereon, characterized in that: include: An adjustment component (4) disposed inside the mold mechanism (2); A bolt assembly (3) mounted on the mold mechanism (2) and used to drive the adjustment assembly (4) to move axially; The mold mechanism (2) comprises a second pipe (22) and a first pipe (21) and a die head (23) connected at both ends thereof, wherein an isolation pipe (211) is fixedly connected inside the first pipe (21); A flow channel 1 (231) is provided in the pipe 1 (21), and both the flow channel 1 (231) and the flow channel 2 (232) can be communicated with the inner cavity of the die head (23); The regulating assembly (4) comprises a sleeve rod (41) movably sleeved in an isolation tube (211), an inclined groove (411) being provided on an inner wall of the sleeve rod (41), a core rod (42) being movably sleeved in the sleeve rod (41), one end of the core rod (42) being connected to a bearing in the first pipe (21), and the other end thereof extending into the first flow channel (231), a connecting piece (43) being fixedly sleeved on the outside of the core rod (42), a flow tube (44) capable of communicating with the second flow channel (232) being fixedly connected in an annular array on the connecting piece (43), and a column (233) capable of blocking the flow tube (44) being fixedly connected in the die head (23); The cavity of the second pipe (22) forms a first passage with the cavity of the die head (23) and the flow channel (231); The cavity of the second pipeline (22) forms a second passage with the second flow channel (232) through the cavity of the die head (23) and the flow pipe (44).

2. The CPVC pipe extrusion die with composite flow channels according to claim 1, characterized in that: The inner diameters of the pipe one (21) and the pipe two (22) are both larger than the die head (23), and a heating wire is provided in the die mechanism (2).

3. The CPVC pipe extrusion die with composite flow channels according to claim 1, characterized in that: The bolt assembly (3) comprises a bolt body (31), a U-shaped member (32) and a convex shaft (33); the bolt body (31) is threadedly connected to the isolation tube (211), one end of which extends to the outside of the mold mechanism (2) through the isolation tube (211); the U-shaped member (32) is bearing-connected to the bottom of the bolt body (31); one end of the convex shaft (33) is fixedly connected to the U-shaped member (32), and the other end of the convex shaft (33) can slide in the inclined groove (411); In the initial state, one end of the U-shaped member (32) is located at the top of the inclined groove (411).

4. The CPVC pipe extrusion die with composite flow channels according to claim 1, characterized in that: The core rod (42) is provided with an arc-shaped groove (421) located inside the sleeve rod (41), and the sleeve rod (41) is fixedly connected with a second convex shaft (412) which slides inside the arc-shaped groove (421).

5. The CPVC pipe extrusion die with composite flow channels according to claim 1, characterized in that: A tension spring assembly tube (5) is also sleeved in the die head (23), and the tension spring assembly tube (5) is also located in the second flow channel (232); The tension spring assembly tube (5) is provided with elastic extrusion pieces (6) in an annular array; A plurality of push rods (431) are fixedly connected in an annular array on the connecting member (43), and one end of the push rods (431) can extend into the tension spring assembly tube (5) and abut against the elastic extrusion member (6); The tension spring assembly tube (5) has a tendency to move toward the inside of the die head (23) due to its own tension, and the push rod (431) can push the tension spring assembly tube (5) to move in the axial direction through the elastic extrusion piece (6).

6. The CPVC pipe extrusion die with composite flow channels according to claim 5, characterized in that: The die head (23) is also provided with a slope (234) serving as the inner surface of the second flow channel (232); one end of the tension spring assembly tube (5) is located inside the slope (234) and is used to isolate the connection between one end of the tension spring assembly tube (5) and the second flow channel (232) when the tension spring assembly tube (5) moves.

7. The CPVC pipe extrusion die with composite flow channels according to claim 5, characterized in that: The elastic extrusion piece (6) is elastically connected to the interior of the tension spring assembly tube (5), and the elastic extrusion piece (6) is provided with an outlet (61), an inclined surface (62), a reset opening (63) and a straight slot opening (64); An elastic convex shaft (4311) capable of sliding in the straight slot (64) is disposed at one end of the push rod (431) close to the elastic extrusion member (6); the elastic convex shaft (4311) is initially located inside the straight slot (64) and at a height between the outlet (61) and the reset port (63); and when the elastic extrusion member (6) rotates about the axis, its end can be tilted and extend into the second flow channel (232); The elastic convex shaft (4311) can slide in the straight notch (64) to cause the elastic extrusion member (6) to rotate and escape from the straight notch (64) through the outlet (61), thereby causing the tension spring assembly tube (5) to reset the elastic extrusion member (6) due to its own tension force; The elastic convex shaft (4311) is compressed and accumulates force when it is reset and moves along the inclined surface (62), and enters the straight groove (64) through the reset opening (63).

8. The CPVC pipe extrusion die with composite flow channels according to claim 7, characterized in that: The side of the elastic extrusion piece (6) facing the second flow channel (232) is an arc surface. When the elastic extrusion piece (6) is cut along the arc surface and the die head (23) in a direction perpendicular to the axial direction of the die head (23), the obtained cross-sectional edge is circular.

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