CPVC Pipe Extrusion Die with Composite Runner

Abstract

The present invention belongs to the technical field of CPVC pipe processing, and discloses a CPVC pipe extrusion die with a composite runner, including an extruder and a die mechanism installed thereon, and further including: an adjusting assembly disposed inside the die mechanism; a bolt assembly installed on the die mechanism for driving the adjusting assembly to move axially. In the above solution, after the extruder is stopped first, the operator rotates the bolt body to drive the first convex shaft to move downward in the inclined groove through the U-shaped part, thereby pushing the sleeve rod to move to block the inner end of the first runner. At the same time, the movement of the sleeve rod will also drive the die core rod and the connecting piece to move, so that the die head cavity is communicated with the second runner through the material flow pipe. After the adjustment is completed, the extruder is then operated, thereby reducing the downtime of the extruder and improving the adjustment efficiency, and solving the problem that the extrusion efficiency of the pipe is reduced due to the long-term shutdown of the equipment when the extrusion die head is replaced.

Description

Technical Field

[0001] The present invention belongs to the technical field of CPVC pipe processing, and specifically relates 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) resin after chlorination modification. The raw materials are added to a high-speed mixer in proportion and then melt-mixed by a twin-screw extruder. Finally, the molten material is extruded and formed through a die head.

[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 pipe diameters, the operator needs to spend a lot of time disassembling and installing the die. During the process of disassembling and installing the die, the equipment needs to be shut down for a long time, resulting in a reduction in the pipe production efficiency. And after the new die head is installed, it also needs to be debugged, further increasing the downtime of the equipment and invisibly increasing the production cost.

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

[0005] To solve the problems raised in the above background art, the present invention provides a CPVC pipe extrusion die with a composite flow channel, which solves the problem that the extrusion efficiency of the pipe is reduced due to the long-time shutdown of the equipment when replacing the extrusion die head of the extruder.

[0006] To achieve the above object, the present invention provides the following technical solution: A CPVC pipe extrusion die with a composite flow channel, including an extruder and a die mechanism installed thereon, further including: an adjusting component disposed inside the die mechanism; a bolt component installed on the die mechanism for driving the adjusting component to move axially; the die mechanism includes a pipe two and a pipe one and a die head connected to both ends thereof, and an isolation pipe is fixedly connected inside the pipe one;

[0007] A flow channel one is provided inside the pipe one, and both the flow channel one and the flow channel two can communicate with the inner cavity of the die head;

[0008] The adjusting component includes a sleeve rod movably sleeved inside the isolation pipe, there is an inclined groove on the inner wall of the sleeve rod, a die core rod is movably sleeved inside the sleeve rod, one end of the die core rod is connected by a bearing inside the pipe one, and the other end thereof extends into the flow channel one. A connecting piece is fixedly sleeved outside the die core rod, and flow material pipes that can communicate with the flow channel two are fixedly connected in a circumferential array on the connecting piece, and a column body that can block the flow material pipes is fixedly connected inside the die head;

[0009] The cavity of the pipe two forms a first passage with the flow channel one through the die head cavity;

[0010] The second cavity of the pipeline forms a second passage with the runner two through the die head cavity and the material flow pipe.

[0011] Preferably, the inner diameters of the first pipeline and the second pipeline are both larger than the die head, and heating wires are arranged in the die mechanism.

[0012] Preferably, the bolt assembly includes a bolt body, a U-shaped part and a first convex shaft. The bolt body is threadedly connected to the isolation pipe, and one end of the bolt body extends to the outside of the die mechanism through the isolation pipe. The U-shaped part is connected to the bottom of the bolt body by a bearing. One end of the first convex shaft is fixedly connected to the U-shaped part, and the other end can slide in the inclined groove.

[0013] In the initial state, one end of the U-shaped part is located at the top of the inclined groove.

[0014] Preferably, an arc-shaped groove located inside the sleeve rod is formed on the die core rod, and a second convex shaft that slides in the arc-shaped groove is fixedly connected to the sleeve rod.

[0015] Preferably, a combined spring tube is further sleeved inside the die head, and the combined spring tube is also located in the runner two; elastic extrusion parts are arranged in an annular array on the combined spring tube;

[0016] A plurality of ejector rods are fixedly connected in an annular array on the connecting part. One end of the ejector rod can extend into the combined spring tube and abut against the elastic extrusion part;

[0017] The combined spring tube has a tendency to move towards the inside of the die head under its own tension, and the ejector rod can push the combined spring tube to move in the axial direction through the elastic extrusion part.

[0018] Preferably, a slope surface serving as the inner surface of the runner two is further formed inside the die head. One end of the combined spring tube is located inside the slope surface, and when the combined spring tube moves, it is used to isolate the communication between one end of the combined spring tube and the runner two.

[0019] Preferably, the elastic extrusion part is elastically connected to the inside of the combined spring tube, and an outlet, an inclined surface, a reset port and a straight groove port are formed on the elastic extrusion part;

[0020] An elastic convex shaft that can slide in the straight groove port is arranged at one end of the ejector rod close to the elastic extrusion part. The elastic convex shaft is initially located inside the straight groove port and its height is between the outlet and the reset port. When the elastic extrusion part rotates around the axis, its end can tilt up and extend into the runner two;

[0021] The elastic convex shaft can slide in the straight groove port to rotate the elastic extrusion part and disengage from the straight groove port through the outlet, so that the combined spring tube drives the elastic extrusion part to reset under its own tension;

[0022] When the elastic convex shaft moves along the inclined plane during reset, it is compressed and stores energy, and enters the straight groove through the reset port.

[0023] Preferably, the surface of the elastic extrusion member facing the second flow channel is an arc surface. When the arc surface and the die head are cut along a direction perpendicular to the axial direction of the die head, the cross-sectional edge obtained is circular.

[0024] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0025] In the above solution, after the extruder is stopped first, the operator rotates the bolt body to drive the first convex shaft to move downward in the inclined groove through the U-shaped member, and then pushes the sleeve rod to move to block the inner end of the first flow channel, that is, the first passage is blocked. At the same time, the movement of the sleeve rod will also drive the die core rod and the connecting member to move, so that the die head cavity is communicated with the second flow channel through the material flow pipe, that is, the second passage is conducted. After the adjustment is completed, the extruder is then operated, thereby reducing the shutdown time of the extruder and improving the adjustment efficiency, and solving the problem that the extruder will cause the equipment to shut down for a long time when replacing the extrusion die head, reducing the pipe extrusion efficiency;

[0026] In the above solution, the movement of the connecting member will also cause the elastic extrusion member to push the pull spring combination pipe to move, thereby avoiding the situation that the remaining material remaining in the second flow channel and contacting the outside world solidifies and adheres to the outer wall of the die head, affecting the pipe extrusion. And when the sleeve rod is reversely reset, the first flow channel will be conducted and the second flow channel will be blocked. During this process, the sleeve rod will drive the second convex shaft to slide in the arc-shaped groove and force the die core rod to rotate, avoiding the situation that the remaining material in the first flow channel and contacting the outside world solidifies and adheres to the die core rod, affecting the pipe extrusion;

[0027] In the above solution, the ejector rod can drive the elastic convex shaft to slide downward in the straight groove opening, which can push the elastic extrusion member to rotate around the axis, so that the elastic extrusion member can tilt up and extrude the remaining material in the second flow channel, thereby avoiding the situation of slipping when the pull spring combination pipe pushes out the remaining material. When the elastic convex shaft disengages from the straight groove opening at the outlet, at this time, the pull spring combination pipe and the elastic extrusion member are reset under the action of their own tensile force and elastic force respectively. When adjusting the pipe diameter again, the ejector rod needs to drive the elastic convex shaft to move in the reverse direction. At this time, the elastic convex shaft will move upward along the inclined plane and enter the straight groove opening through the reset port to complete the reset. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 It is a schematic installation structure diagram of the present invention;

[0029] Figure 2 It is a schematic overall structure diagram of the present invention;

[0030] Figure 3 It is a schematic front sectional structure diagram of the mold mechanism of the present invention;

[0031] Figure 4Perspective view of the adjustment component of the present invention;

[0032] Figure 5 Partial sectional structure schematic diagram of the sleeve rod of the present invention;

[0033] Figure 6 Front sectional structure schematic diagram of the present invention;

[0034] Figure 7 is Figure 6 Enlarged view of part A in

[0035] Figure 8 Structure schematic diagram of the elastic extrusion part of the present invention.

[0036] In the figure: 1, extruder; 2, die mechanism; 21, pipe one; 211, isolation pipe; 22, pipe two; 23, die head; 231, flow channel one; 232, flow channel two; 233, cylinder; 234, slope; 3, bolt assembly; 31, bolt body; 32, U-shaped part; 33, convex shaft one; 4, adjustment component; 41, sleeve rod; 411, inclined groove; 412, convex shaft two; 42, die core rod; 421, arc groove; 43, connecting piece; 431, ejector rod; 4311, elastic convex shaft; 44, material flow pipe; 5, tension spring combined pipe; 6, elastic extrusion part; 61, outlet; 62, inclined surface; 63, reset port; 64, straight groove opening. Detailed implementation method

[0037] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present invention.

[0038] As Figures 1 to 8 shown, the present invention provides a CPVC pipe extrusion die with a composite flow channel, including an extruder 1 and a die mechanism 2 installed thereon, and further including: an adjustment component 4, which is arranged inside the die mechanism 2; a bolt assembly 3, which is installed on the die mechanism 2 and used to drive the adjustment component 4 to move axially;

[0039] The die mechanism 2 includes a pipe two 22 and a pipe one 21 and a die head 23 connected to both ends thereof. An isolation pipe 211 is fixedly connected inside the pipe one 21;

[0040] A flow channel one 231 is opened inside the pipe one 21, and both the flow channel one 231 and the flow channel two 232 can be communicated with the inner cavity of the die head 23;

[0041] The adjusting assembly 4 includes a sleeve rod 41 movably sleeved in the isolation pipe 211. There is an inclined groove 411 on the inner wall of the sleeve rod 41. A die core rod 42 is movably sleeved in the sleeve rod 41. One end of the die core rod 42 is connected to the inside of the first pipe 21 by a bearing, and the other end extends into the first runner 231. A connecting piece 43 is fixedly sleeved outside the die core rod 42. Flow pipes 44 that can communicate with the second runner 232 are fixedly connected in an annular array on the connecting piece 43. A cylinder 233 that can block the flow pipes 44 is fixedly connected in the die head 23;

[0042] The cavity of the second pipe 22 forms a first passage with the first runner 231 through the cavity of the die head 23; the cavity of the second pipe 22 forms a second passage with the second runner 232 through the cavity of the die head 23 and the flow pipes 44;

[0043] The inner diameters of the first pipe 21 and the second pipe 22 are both larger than that of the die head 23, and heating wires are arranged in the mold mechanism 2;

[0044] The bolt assembly 3 includes a bolt body 31, a U-shaped part 32 and a first convex shaft 33. The bolt body 31 is threadedly connected to the isolation pipe 211. One end of it extends to the outside of the mold mechanism 2 through the isolation pipe 211. The U-shaped part 32 is connected to the bottom of the bolt body 31 by a bearing. One end of the first convex shaft 33 is fixedly connected to the U-shaped part 32, and the other end can slide in the inclined groove 411;

[0045] In the initial state, one end of the U-shaped part 32 is located at the top of the inclined groove 411;

[0046] With the above scheme, after the extruder 1 is stopped first, the operator rotates the bolt body 31 to drive the first convex shaft 33 to move downward in the inclined groove 411 through the U-shaped part 32, thereby pushing the sleeve rod 41 to move to block the inner end of the first runner 231, that is, the first passage is blocked. At the same time, the movement of the sleeve rod 41 will also drive the die core rod 42 and the connecting piece 43 to move, so that the cavity of the die head 23 is communicated with the second runner 232 through the flow pipes 44, that is, the second passage is conducted. After the adjustment is completed, the extruder 1 is then 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 stop for a long time when replacing the extrusion die head, resulting in a reduction in the pipe extrusion efficiency.

[0047] As Figures 2 - 7 shown, an arc-shaped groove 421 located inside the sleeve rod 41 is formed on the die core rod 42, and a second convex shaft 412 that slides in the arc-shaped groove 421 is fixedly connected to the sleeve rod 41;

[0048] A spring combination tube 5 is also sleeved in the die head 23, and the spring combination tube 5 is also located in the second runner 232; elastic extrusion parts 6 are arranged in an annular array on the spring combination tube 5;

[0049] 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;

[0050] 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;

[0051] 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.

[0052] 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.

[0053] 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.

[0054] At the same time, after the residual material is extruded, the operator also needs to scrape it off with a scraper.

[0055] like Figures 2 - 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;

[0056] One end of the ejector rod 431 close to the elastic extrusion member 6 is provided with an elastic convex shaft 4311 that can slide in the straight slot 64. Initially, the elastic convex shaft 4311 is located inside the straight slot 64 and its height is between the outlet 61 and the reset port 63. When the elastic extrusion member 6 rotates around the axis, its end can tilt up and extend into the second flow channel 232;

[0057] The elastic convex shaft 4311 can slide in the straight slot 64 to rotate the elastic extrusion member 6 and disengage from the straight slot 64 through the outlet 61, so that the tension spring combination tube 5 drives the elastic extrusion member 6 to reset under its own tension;

[0058] When the elastic convex shaft 4311 resets and moves along the inclined surface 62, it is compressed and stores energy, and enters the straight slot 64 through the reset port 63;

[0059] The surface of the elastic extrusion member 6 facing the second flow channel 232 is an arc surface. When the arc surface and the die head 23 are cut along the direction perpendicular to the axis of the die head 23, the cross-sectional edge obtained is circular, so as to ensure the smooth inner wall of the extruded pipe;

[0060] With the above scheme, the ejector rod 431 can drive the elastic convex shaft 4311 to slide downward in the straight slot 64 to push the elastic extrusion member 6 to rotate around the axis, so that the elastic extrusion member 6 can tilt up and extrude the remaining material in the second flow channel 232, thus avoiding the situation of slipping when the tension spring combination tube 5 pushes out the remaining material. When the elastic convex shaft 4311 disengages from the straight slot 64 at the outlet 61, at this time, the tension spring combination tube 5 and the elastic extrusion member 6 are reset under the action of their own tension and elastic force respectively. When adjusting the pipe diameter again, the ejector rod 431 needs to drive the elastic convex shaft 4311 to move in the reverse direction. At this time, the elastic convex shaft 4311 will move upward along the inclined surface 62 and enter the straight slot 64 through the reset port 63 to complete the reset;

[0061] It should be noted that the operator can avoid the situation that the extrusion pressure in the mold will squeeze the elastic extrusion member 6 to rotate around the axis after the elastic convex shaft 4311 disengages from the straight slot 64 by lengthening one end of the elastic extrusion member 6 that tilts up and shortening the collapsed end of the elastic extrusion member 6.

[0062] The working principle and usage process of the present invention:

[0063] When the pipe diameter needs to be adjusted, first stop the extruder 1. Then the operator rotates the bolt body 31 to drive the first convex shaft 33 to move downward in the inclined slot 411 through the U-shaped member 32, thereby pushing the sleeve rod 41 to move to block the inner end of the first flow channel 231. At the same time, the movement of the sleeve rod 41 will also drive the die core rod 42 and the connecting member 43 to move, so that the cavity of the die head 23 is communicated with the second flow channel 232 through the flow pipe 44. After the adjustment is completed, then start the extruder 1;

[0064] 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.

[0065] 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.

[0066] 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.

[0067] 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 runner, comprising an extruder (1) and a die mechanism (2) installed thereon, characterized in that it also Comprising: A regulating component (4) disposed inside the die mechanism (2); A bolt component (3) mounted on the die mechanism (2) for driving the regulating component (4) to move axially; The die mechanism (2) includes a second pipe (22) and a first pipe (21) and a die head (23) connected to both ends thereof. An isolation pipe (211) is fixedly connected inside the first pipe (21); A first flow channel (231) is formed in the first pipe (21), and both the first flow channel (231) and a second flow channel (232) can communicate with the inner cavity of the die head (23); The regulating component (4) includes a sleeve rod (41) movably sleeved inside the isolation pipe (211). An inclined groove (411) is formed on the inner wall of the sleeve rod (41). A die core rod (42) is movably sleeved inside the sleeve rod (41). One end of the die core rod (42) is connected to the inside of the first pipe (21) by a bearing, and the other end extends into the first flow channel (231). A connecting member (43) is fixedly sleeved outside the die core rod (42). Flow pipes (44) capable of communicating with the second flow channel (232) are fixedly connected to the connecting member (43) in a circumferential array. A cylinder (233) capable of blocking the flow pipes (44) is fixedly connected inside the die head (23); The cavity of the second pipe (22) forms a first passage with the first flow channel (231) through the cavity of the die head (23); The cavity of the second pipe (22) forms a second passage with the second flow channel (232) through the cavity of the die head (23) and the flow pipes (44); After the extruder (1) is stopped, the bolt component (3) moves downward in the inclined groove (411), thereby pushing the sleeve rod (41) to move to block the inner end of the first flow channel (231). At the same time, the movement of the sleeve rod (41) will also drive the die core rod (42) and the connecting member (43) to move, thereby making the cavity of the die head (23) communicate with the second flow channel (232) through the flow pipes (44), that is, the second passage is conducted. After adjustment, the extruder (1) is then operated; A spring combination pipe (5) is further sleeved inside the die head (23), and the spring combination pipe (5) is also located inside the second flow channel (232); Elastic pressing members (6) are arranged in a circumferential array on the spring combination pipe (5); A plurality of ejector rods (431) are fixedly connected to the connecting member (43) in a circumferential array. One end of the ejector rod (431) can extend into the spring combination pipe (5) and abut against the elastic pressing member (6); The spring combination pipe (5) has a tendency to move into the die head (23) under its own pulling force, and the ejector rod (431) can push the spring combination pipe (5) to move axially through the elastic pressing member (6).

2. The CPVC pipe extrusion die with a composite flow channel according to claim 1, characterized in that: The inner diameters of the first pipe (21) and the second pipe (22) are both larger than that of the die head (23), and heating wires are provided inside the die mechanism (2).

3. The CPVC pipe extrusion die with a composite flow channel according to claim 1, wherein: The bolt assembly (3) includes a bolt body (31), a U-shaped part (32), and a first convex shaft (33). The bolt body (31) is threadedly connected to the isolation tube (211), and one end thereof extends to the outside of the die mechanism (2) through the isolation tube (211). The U-shaped part (32) is connected to the bottom of the bolt body (31) by a bearing. One end of the first convex shaft (33) is fixedly connected to the U-shaped part (32), and the other end can slide in the inclined groove (411). In the initial state, one end of the U-shaped part (32) is located at the top of the inclined groove (411).

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

5. The CPVC pipe extrusion die with a composite flow channel according to claim 1, characterized in that: A slope surface (234) serving as the inner surface of the second runner (232) is further formed in the die head (23). One end of the tension spring combination tube (5) is located inside the slope surface (234), and is used to isolate the communication between one end of the tension spring combination tube (5) and the second runner (232) when the tension spring combination tube (5) moves.

6. The CPVC pipe extrusion die with a composite flow channel according to claim 1, characterized in that: The elastic extrusion member (6) is elastically connected inside the tension spring combination tube (5). An outlet (61), an inclined surface (62), a reset port (63), and a straight groove port (64) are formed in the elastic extrusion member (6). An elastic convex shaft (4311) that can slide in the straight groove port (64) is provided at one end of the ejector rod (431) close to the elastic extrusion member (6). Initially, the elastic convex shaft (4311) is located inside the straight groove port (64) and its height is between the outlet (61) and the reset port (63). When the elastic extrusion member (6) rotates around the axis, its end can tilt up and extend into the second runner (232). The elastic convex shaft (4311) can slide in the straight groove port (64) to rotate the elastic extrusion member (6) and disengage from the straight groove port (64) through the outlet (61), so that the tension spring combination tube (5) drives the elastic extrusion member (6) to reset under its own tension. When the elastic convex shaft (4311) resets and moves along the inclined surface (62), it is compressed and stores energy, and enters the straight groove port (64) through the reset port (63).

7. The CPVC pipe extrusion die with a composite runner according to claim 6, characterized in that: The surface of the elastic extrusion member (6) facing the second runner (232) is an arc surface. When the arc surface and the die head (23) are cut along a direction perpendicular to the axis of the die head (23), the edge of the obtained cross-section is circular.

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