CPVC (chlorinated polyvinyl chloride) large-diameter pipe extrusion molding cooling device

Abstract

The invention belongs to the technical field of CPVC pipe production, and discloses a CPVC large-diameter pipe extrusion molding cooling device which comprises an extruder body, an extrusion pipe is fixed to the surface of the extruder body, one side of the surface of the extrusion pipe is communicated with an extrusion opening, a motor is fixed to one side of the surface of the extruder body, and the extrusion opening is communicated with the extrusion opening. An output shaft of the motor is provided with a transmission part, the other end of the transmission part is provided with an auger rod in a transmission manner, the surface of the auger rod is fixedly provided with an auger sheet, the surface of the extruder body is provided with a feeding channel, and the other end of the feeding channel is communicated with a feeding barrel; through the arrangement of the liquid supply mechanism and the processing mechanism, cooling liquid circulates in the auger rod, heat of the homogenizing metering area of the auger rod can be absorbed, heat is supplied to the solid conveying area and the melting compression area, the homogenizing metering area can be cooled, and the melting compression area can be heated. And the purpose of reducing heat production energy consumption of the solid conveying area and the melting compression area can be achieved.

Description

Technical Field

[0001] The invention belongs to the technical field of CPVC pipe production, in particular to a CPVC large-diameter pipe extrusion molding cooling device. Background Art

[0002] CPVC (chlorinated polyvinyl chloride) large-diameter pipes are large-size plastic pipes made of chlorinated polyvinyl chloride resin as the main raw material, with necessary additives added, and processed through extrusion molding. Pipe extrusion is a thermoplastic polymer molding processing method. The molten polymer is forced through the die head by an extruder to form a continuous pipe product with a specific cross-sectional shape and length. This process combines plasticization, pressure molding and shaping, and is a key technology for manufacturing CPVC large-diameter pipes.

[0003] However, compared with PVC processing, the temperature of the melting zone of CPVC processing is higher, reaching 220-230℃. Due to the limitation of the screw structure, the traditional single-screw extruder has the problem of poor heat dissipation, which is prone to local overheating, resulting in excessive temperature in the homogenization metering zone, causing material decomposition, and further affecting the molding extrusion of the material in the homogenization metering zone. In addition, the thermal energy utilization rate of existing single-screw equipment is low, the heat in the homogenization metering zone cannot be effectively recovered, and the energy consumption of the cooling system accounts for a high proportion, making it difficult to achieve energy-saving goals. Summary of the invention

[0004] In order to solve the problems raised in the above background technology, the present invention provides a CPVC large-diameter pipe extrusion molding cooling device.

[0005] To achieve the above object, the present invention provides the following technical solution: a CPVC large-diameter pipe extrusion molding cooling device, comprising an extruder body, an extrusion tube is fixed on the surface of the extruder body, one side of the surface of the extrusion tube is connected with an extrusion port, a motor is fixed on one side of the surface of the extruder body, a transmission member is provided on the output shaft of the motor, an auger rod is provided at the other end of the transmission member, an auger sheet is fixed on the surface of the auger rod, a feed channel is provided on the surface of the extruder body, and the other end of the feed channel is connected with a feed barrel, and further comprising: A liquid supply mechanism is arranged on the surface of the extruder body, and the surface of the liquid supply mechanism is connected to the processing mechanism; A driving mechanism disposed on the surface of the liquid supply mechanism, wherein the surface of the driving mechanism is provided with a resetting elastic member; A limiting mechanism is arranged on the surface of the driving mechanism for limiting the position, the inner cavity of the auger rod is provided with a partition, and the surface of the partition is provided with reinforcing ribs; A heat exchange mechanism is arranged on the surface of the material supply barrel and is connected to the liquid supply mechanism.

[0006] Preferably, the liquid supply mechanism includes a cooler fixed to the surface of the extruder body, the active end of the cooler is connected to a delivery pipe, the other end of the delivery pipe is connected to a two-way flow-type rotary joint, the two-way flow-type rotary joint is arranged at one end of the auger rod, the surface of the two-way flow-type rotary joint is connected to a plurality of liquid supply pipes, the liquid supply pipes are arranged in a ring array in the inner cavity of the auger rod, the other end of the liquid supply pipe is connected to a pressure supply pipe, and the other end of the pressure supply pipe is connected to a horizontal connecting pipe.

[0007] Preferably, the inner diameter of the pressure supply pipe at one end close to the driving mechanism is smaller than the inner diameter of the end close to the two-way flow type rotary joint.

[0008] Preferably, the processing mechanism includes a connecting elbow connected to the other end of the horizontal connecting pipe, the other end of the connecting elbow is connected to a connecting branch, the other end of the connecting branch is connected to a plurality of dispersion pipes, the other end of the dispersion pipe is connected to a return pipe, and the other end of the return pipe is connected to the inner cavity of the two-way flow rotary joint.

[0009] Preferably, the return pipe is arranged on a side away from the axis of the auger rod, the horizontal connecting pipe is arranged on a side close to the axis of the auger rod, and the partition is arranged between the horizontal connecting pipe and the return pipe.

[0010] Preferably, the driving mechanism includes a plurality of connecting shells connected to the surface of the horizontal connecting pipe, a windmill rotates in the inner cavity of the connecting shell, a rotating block is fixed to the other end of the windmill axis, protrusions are fixed on both sides of the surface of the rotating block, a push rod is fitted on the surface of the protrusion, and the other end of the push rod is fitted to the reset elastic member.

[0011] Preferably, the limiting mechanism includes sliders fixed on both sides of the top rod surface, the inner cavity of the slider is slidably provided with a sliding rod, the surface of the sliding rod is fixed with a spring, and the other end of the spring is fixed to the inner cavity of the auger rod.

[0012] Preferably, the heat exchange mechanism includes a return pipe connected to one side of the surface of the two-way circulation rotary joint, the return pipe is connected to the reflux pipe, the other end of the return pipe is connected to the annular pipe, the other end of the annular pipe is connected to the liquid outlet pipe, and the other end of the liquid outlet pipe is connected to the cooler.

[0013] Preferably, the partition is a heat-insulating layer, the inner cavity of the partition is locally arranged, and the material of the partition is a silica aerogel composite material.

[0014] Preferably, the reinforcing ribs are made of titanium alloy, radially penetrate the interlayer, and the two ends are welded and fixed to the inner cavity of the auger rod.

[0015] Compared with the prior art, the present invention has the following beneficial effects: 1. The present invention arranges a liquid supply mechanism and a processing mechanism so that the cooling liquid flows through the interior of the auger rod, which can absorb the heat of the homogenization metering zone of the auger rod and supply heat to the solid conveying zone and the melting compression zone. This can not only cool the homogenization metering zone, but also reduce the energy consumption of heat production in the solid conveying zone and the melting compression zone.

[0016] 2. The present invention provides a driving mechanism, under the action of the liquid supply mechanism, so that the driving mechanism can periodically vibrate the reset elastic member, thereby assisting the flow of materials and preventing the materials from adhering to the surface of the auger rod.

[0017] 3. The present invention blocks the heat from the solid conveying area and the melting compression area from being transferred to the liquid supply mechanism by setting up the partition, thereby ensuring that the temperature of the processing mechanism is kept at a low temperature. The reinforcing rib structure enhances the torsional strength of the auger rod and avoids the strength reduction caused by the partition. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the three-dimensional structure of the present invention; Figure 2 It is a schematic diagram of the three-dimensional structure of the extruded tube after being cut open in the present invention; Figure 3 It is a partial three-dimensional structural schematic diagram of the motor, transmission member, auger rod and auger piece in the present invention; Figure 4 It is a partial three-dimensional structural schematic diagram of the liquid supply mechanism in the present invention; Figure 5 It is a schematic diagram of the partial three-dimensional structure inside the auger rod of the present invention; Figure 6 It is a front view structural schematic diagram of the liquid supply mechanism and the processing mechanism in the present invention; Figure 7 It is a schematic diagram of the partial three-dimensional structure of the auger rod and the partition in the present invention; Figure 8 For the present invention Figure 7 Schematic diagram of the enlarged local three-dimensional structure at B in the middle; Fig. 9 It is a partial three-dimensional structural schematic diagram of the driving mechanism and the processing mechanism in the present invention; Fig.10 For the present invention Figure 3 A schematic diagram of the enlarged local three-dimensional structure at point A in the middle; Fig.11 It is a partial three-dimensional structural schematic diagram of the driving mechanism and the limiting mechanism in the present invention; Fig.12 It is a partial three-dimensional structural schematic diagram of the liquid supply mechanism and the heat exchange mechanism in the present invention.

[0019] In the figure: 1. extruder body; 2. extrusion tube; 3. extrusion port; 4. motor; 5. transmission member; 6. auger rod; 7. auger blade; 8. feeding barrel; 9. feeding channel; 10. liquid supply mechanism; 101. cooling machine; 102. delivery pipe; 103. two-way flow rotary joint; 104. liquid supply pipe; 105. pressure supply pipe; 106. horizontal connecting pipe; 11. processing mechanism; 111. connecting elbow; 112. connecting Distributor; 113, dispersion pipe; 114, return pipe; 12, driving mechanism; 121, connecting shell; 122, windmill; 123, rotating block; 124, protrusion; 125, push rod; 13, reset elastic member; 14, limiting mechanism; 141, slider; 142, slide rod; 143, spring; 15, partition; 16, reinforcing rib; 17, heat exchange mechanism; 171, return pipe; 172, annular pipe; 173, liquid outlet pipe. DETAILED DESCRIPTION

[0020] 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.

[0021] like Figures 1 to 12 As shown, the present invention provides a CPVC large-diameter pipe extrusion molding cooling device, including an extruder body 1, an extrusion tube 2 is fixed on the surface of the extruder body 1, one side of the surface of the extrusion tube 2 is connected with an extrusion port 3, a motor 4 is fixed on one side of the surface of the extruder body 1, the output shaft of the motor 4 is provided with a transmission member 5, the other end of the transmission member 5 is provided with an auger rod 6, an auger piece 7 is fixed on the surface of the auger rod 6, a feed channel 9 is opened on the surface of the extruder body 1, and the other end of the feed channel 9 is connected with a feed barrel 8, and also includes: A liquid supply mechanism 10 is disposed on the surface of the extruder body 1, and the surface of the liquid supply mechanism 10 is connected to a processing mechanism 11; A driving mechanism 12 is disposed on the surface of the liquid supply mechanism 10, and a reset elastic member 13 is disposed on the surface of the driving mechanism 12; A limiting mechanism 14 is provided on the surface of the driving mechanism 12 for limiting the position. The inner cavity of the auger rod 6 is provided with a partition 15, and the surface of the partition 15 is provided with a reinforcing rib 16; A heat exchange mechanism 17 is disposed on the surface of the feed barrel 8 and communicated with the liquid supply mechanism 10 .

[0022] The liquid supply mechanism 10 includes a cooler 101 fixed to the surface of the extruder body 1, the working end of the cooler 101 is connected to a delivery pipe 102, the other end of the delivery pipe 102 is connected to a two-way flow type rotary joint 103, the two-way flow type rotary joint 103 is arranged at one end of the auger rod 6, the surface of the two-way flow type rotary joint 103 is connected to a plurality of liquid supply pipes 104, the liquid supply pipes 104 are arranged in a circular array in the inner cavity of the auger rod 6, the other end of the liquid supply pipe 104 is connected to a pressure supply pipe 105, the pressure supply pipe 105 is connected to the pressure supply pipe 106, and the pressure supply pipe 107 is connected to the pressure supply pipe 108. The other end of the tube 105 is connected to a horizontal connecting pipe 106. In the present embodiment, through the arrangement of the cooler 101, the delivery pipe 102, the two-way flow type rotary joint 103, the liquid supply pipe 104, the pressure supply pipe 105 and the horizontal connecting pipe 106, under the action of the cooler 101, the cooled coolant can be delivered into the liquid supply pipe 104 through the delivery pipe 102 and the two-way flow type rotary joint 103, and then under the action of the pressure supply pipe 105, the coolant enters the horizontal connecting pipe 106.

[0023] like Fig. 9 As shown, the inner diameter of the pressure supply pipe 105 near the driving mechanism 12 is smaller than the inner diameter near the two-way flow rotary joint 103. In this embodiment, through this arrangement, the Bernoulli effect is used to accelerate the flow of the coolant, thereby providing favorable conditions for the operation of the driving mechanism 12.

[0024] The processing mechanism 11 includes a connecting elbow 111 connected to the other end of the horizontal connecting pipe 106, the other end of the connecting elbow 111 is connected to a connecting branch 112, the other end of the connecting branch 112 is connected to a plurality of dispersion pipes 113, the dispersion pipes 113 are distributed in a mesh shape to increase the contact area with the inner cavity of the auger rod 6, the other end of the dispersion pipe 113 is connected to a return pipe 114, the return pipe 114 adopts a tapered design, the inner diameter changes from large to small, and the Bernoulli effect is used to accelerate the reflux of the coolant, the other end of the return pipe 114 is connected to the inner cavity of the two-way flow rotary joint 103, in this embodiment, through the connecting elbow 111, the connecting branch 112, The arrangement of the dispersion pipe 113 and the return pipe 114 is such that when coolant flows in the horizontal connecting pipe 106, the coolant enters the connecting elbow 111, and then under the action of the connecting branch 112, the coolant is dispersed into the dispersion pipe 113, and the dispersion pipe 113 is close to the surface of the auger rod 6, and thus the heat on the surface of the auger rod 6 can be absorbed, and enter the heat exchange mechanism 17 through the return pipe 114. In addition, after the coolant absorbs heat in the dispersion pipe 113, the heat can be dissipated when entering the return pipe 114, and thus heat can be provided to the conveying area and melting area of ​​the extrusion tube 2, thereby achieving energy-saving effect.

[0025] like Figure 6As shown, the return pipe 114 is arranged on the side away from the axis of the auger rod 6, the horizontal connecting pipe 106 is arranged on the side close to the axis of the auger rod 6, and the partition 15 is arranged between the horizontal connecting pipe 106 and the return pipe 114. In this embodiment, through this arrangement, the coolant first enters the dispersion pipe 113 when the temperature is low, thereby achieving the effect of absorbing heat. After the temperature of the coolant rises, it can be in the return pipe 114 to achieve the effect of heat dissipation. In addition, since the horizontal connecting pipe 106 is laid close to the axis of the auger rod 6, it can avoid absorbing heat from the conveying zone and the melting zone when the coolant enters.

[0026] The driving mechanism 12 includes a plurality of connecting shells 121 connected to the surface of the horizontal connecting tube 106, and a windmill 122 is rotated in the inner cavity of the connecting shell 121, and a rotating block 123 is fixed to the other end of the axis of the windmill 122, and protrusions 124 are fixed on both sides of the surface of the rotating block 123. A push rod 125 is attached to the surface of the protrusion 124, and the other end of the push rod 125 is attached to the reset elastic member 13. In this embodiment, through the arrangement of the connecting shell 121, the windmill 122, the rotating block 123, the protrusion 124 and the push rod 125, when the coolant enters the connecting shell 121 through the horizontal connecting tube 106, the fluid impacts the windmill 122 to rotate, driving the rotating block 123 and the protrusion 124 to rotate, and the protrusion 124 periodically pushes the push rod 125, compressing the reset elastic member 13 to produce a reciprocating movement.

[0027] The limiting mechanism 14 includes a slider 141 fixed on both sides of the surface of the push rod 125, a slide rod 142 is slidably arranged in the inner cavity of the slider 141, a spring 143 is fixed on the surface of the slide rod 142, and the other end of the spring 143 is fixed to the inner cavity of the auger rod 6. In this embodiment, through the setting of the slider 141, the slide rod 142 and the spring 143, the slider 141 slides along the slide rod 142, and the spring 143 provides a reverse rebound force to limit the travel range of the push rod 125, thereby providing limitation for the operation of the push rod 125.

[0028] The heat exchange mechanism 17 includes a return pipe 171 connected to one side of the surface of the two-way circulation rotary joint 103. The return pipe 171 is connected to the reflux pipe 114. The other end of the return pipe 171 is connected to an annular pipe 172. The annular pipe 172 is nested in the outer wall of the supply barrel 8 and contacts the surface of the supply barrel 8 through the copper-aluminum composite fins. The other end of the annular pipe 172 is connected to an outlet pipe 173. The other end of the outlet pipe 173 is connected to the cooler 101. In this embodiment, through the arrangement of the return pipe 171, the annular pipe 172 and the outlet pipe 173, after the coolant with heat enters the return pipe 171 through the two-way circulation rotary joint 103, the coolant with heat can pass through the annular pipe 172 to heat the material body in the inner cavity of the supply barrel 8, and under the action of the outlet pipe 173, the coolant can enter the cooler 101 to participate in cooling and the next work.

[0029] The liquid supply mechanism 10 → the processing mechanism 11 → the heat exchange mechanism 17 forms a closed loop.

[0030] The partition 15 is a heat-insulating layer, and the length of the partition 15 is equal to the sum of the lengths of the solid conveying zone and the molten compression zone, and the material is a silica aerogel composite material. The reinforcing ribs 16 are made of titanium alloy, radially penetrate the partition 15, and are welded and fixed to the inner cavity of the auger rod 6 at both ends. In this embodiment, through this setting, the density of the silica aerogel composite material is 80~120kg / m³, the thermal conductivity is ≤0.018W / (m·K), the temperature resistance range is -200℃~650℃, and the tensile strength of the reinforcing ribs 16 is ≥800MPa, ensuring that the axial deformation of the auger rod 6 is ≤0.1mm when conveying high-temperature molten CPVC. The aerogel partition 15 is combined with the titanium alloy reinforcing ribs 16 to reduce the axial heat transfer rate of the auger rod 6 while maintaining the torsional strength of the auger rod 6.

[0031] The working principle and use process of the present invention are as follows: the material enters the extruder body 1 from the feed barrel 8 through the feed channel 9, the motor 4 drives the auger rod 6 to rotate through the transmission member 5, the auger blade 7 pushes the material to move toward the extrusion port 3, the material passes through the solid conveying area for loose state, the melting compression area for shearing and heating for plasticization, and the homogenization metering area for homogenization extrusion in turn, the molten material is formed through the extrusion port 3, the extrusion tube 2 provides a stable pressure, the cooler 101 conveys the low-temperature coolant to the liquid supply pipe 104 through the conveying pipe 102 and the two-way rotary joint 103, the coolant accelerates the Bernoulli effect through the tapered section of the pressure supply pipe 105, for example, the inner diameter of the pressure supply pipe inlet is 10mm→the outlet is 6mm, the flow rate is increased by 1.5 times, and enters the horizontal connecting pipe 106 for low-temperature cooling The liquid enters the dispersion pipe 113 through the connecting elbow 111 and the connecting branch 112. Since the dispersion pipe 113 is arranged in the homogenization and metering area, the dispersion pipe 113 is close to the surface of the auger rod 6 and absorbs the heat from the surface of the auger rod 6. After absorbing the heat, it is accelerated back through the tapered reflux pipe 114. When the cooling liquid passes through the solid conveying area and the melting and compression area, due to the presence of a heat cooling device in the homogenization and metering area, the temperature of the homogenization and metering area will be lower than that of the melting and compression area. At this time, the heat of the cooling liquid is lower than that of the melting and compression area, and the heat is dissipated to the outside, thereby achieving the purpose of heating the solid conveying area and the melting and compression area. The high-temperature cooling liquid preheats the material in the feed barrel 8 through the annular pipe 172 of the heat exchange mechanism 17, thereby realizing the recycling of heat energy.

[0032] The high-speed flowing coolant drives the windmill 122 in the connecting shell 121 to rotate, thereby driving the protrusion 124 to periodically push the ejector rod 125, and the ejector rod 125 can periodically cause the reset elastic member 13 to reciprocate, thereby assisting the material flow and preventing the material from adhering to the surface of the auger rod 6, thereby reducing the material adhesion rate. It is suitable for continuous extrusion of large-diameter pipes of high-viscosity CPVC. The limiting mechanism 14 constrains the travel of the ejector rod 125 through the slider 141 and the spring 143 to ensure that the vibration amplitude is controllable.

[0033] The partition 15 blocks the heat from the solid conveying area and the melting compression area from being transferred to the horizontal connecting pipe 106, ensuring that the temperature in the dispersion pipe 113 is at a low temperature. The reinforcing rib 16 structure enhances the torsional strength of the auger rod and avoids the strength reduction caused by the partition 15.

[0034] 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.

[0035] 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 large-diameter pipe extrusion molding cooling device, comprising an extruder body (1), characterized in that: An extrusion tube (2) is fixed on the surface of the extruder body (1), one side of the surface of the extrusion tube (2) is connected to an extrusion port (3), a motor (4) is fixed on one side of the surface of the extruder body (1), an output shaft of the motor (4) is provided with a transmission member (5), an auger rod (6) is provided at the other end of the transmission member (5), an auger blade (7) is fixed on the surface of the auger rod (6), a feed channel (9) is provided on the surface of the extruder body (1), and the other end of the feed channel (9) is connected to a feed barrel (8), and further comprises: A liquid supply mechanism (10) is arranged on the surface of the extruder body (1), and the surface of the liquid supply mechanism (10) is connected to a processing mechanism (11); A driving mechanism (12) disposed on the surface of the liquid supply mechanism (10), wherein a resetting elastic member (13) is disposed on the surface of the driving mechanism (12); A limiting mechanism (14) is arranged on the surface of the driving mechanism (12) for limiting the position, the inner cavity of the auger rod (6) is provided with a partition (15), and the surface of the partition (15) is provided with reinforcing ribs (16); A heat exchange mechanism (17) is disposed on the surface of the material supply barrel (8) and is connected to the liquid supply mechanism (10).

2. The CPVC large-diameter pipe extrusion molding cooling device according to claim 1 is characterized in that: The liquid supply mechanism (10) comprises a cooler (101) fixed to the surface of the extruder body (1); the active end of the cooler (101) is connected to a delivery pipe (102); the other end of the delivery pipe (102) is connected to a two-way flow-type rotary joint (103); the two-way flow-type rotary joint (103) is arranged at one end of the auger rod (6); the surface of the two-way flow-type rotary joint (103) is connected to a plurality of liquid supply pipes (104); the liquid supply pipes (104) are arranged in a circular array in the inner cavity of the auger rod (6); the other end of the liquid supply pipe (104) is connected to a pressure supply pipe (105); the other end of the pressure supply pipe (105) is connected to a horizontal connecting pipe (106).

3. The CPVC large-diameter pipe extrusion molding cooling device according to claim 2 is characterized in that: The inner diameter of the end of the pressure supply pipe (105) close to the driving mechanism (12) is smaller than the inner diameter of the end close to the two-way flow-type rotary joint (103).

4. The CPVC large-diameter pipe extrusion molding cooling device according to claim 2 is characterized in that: The processing mechanism (11) comprises a connecting elbow (111) connected to the other end of the horizontal connecting pipe (106); the other end of the connecting elbow (111) is connected to a connecting branch (112); the other end of the connecting branch (112) is connected to a plurality of dispersion pipes (113); the other end of the dispersion pipe (113) is connected to a return pipe (114); the other end of the return pipe (114) is connected to the inner cavity of the two-way flow-through rotary joint (103).

5. The CPVC large-diameter pipe extrusion molding cooling device according to claim 4 is characterized in that: The return pipe (114) is arranged on a side away from the axis of the auger rod (6), the horizontal connecting pipe (106) is arranged on a side close to the axis of the auger rod (6), and the partition (15) is arranged between the horizontal connecting pipe (106) and the return pipe (114).

6. The CPVC large-diameter pipe extrusion molding cooling device according to claim 2 is characterized in that: The driving mechanism (12) comprises a plurality of connection shells (121) connected to the surface of the horizontal connection tube (106); a windmill (122) is rotatably mounted in the inner cavity of the connection shell (121); a rotating block (123) is fixed to the other end of the axis of the windmill (122); protrusions (124) are fixed to both sides of the surface of the rotating block (123); a push rod (125) is attached to the surface of the protrusion (124); and the other end of the push rod (125) is attached to the reset elastic member (13).

7. The CPVC large-diameter pipe extrusion molding cooling device according to claim 6 is characterized in that: The limiting mechanism (14) comprises sliders (141) fixed to both sides of the surface of the top rod (125), a sliding rod (142) being slidably arranged in the inner cavity of the slider (141), a spring (143) being fixed to the surface of the sliding rod (142), and the other end of the spring (143) being fixed to the inner cavity of the auger rod (6).

8. The CPVC large-diameter pipe extrusion molding cooling device according to claim 4 is characterized in that: The heat exchange mechanism (17) comprises a liquid return pipe (171) connected to one side of the surface of the two-way flow-type rotary joint (103); the liquid return pipe (171) is connected to the reflux pipe (114); the other end of the liquid return pipe (171) is connected to the annular pipe (172); the other end of the annular pipe (172) is connected to the liquid outlet pipe (173); the other end of the liquid outlet pipe (173) is connected to the cooling machine (101).

9. The CPVC large-diameter pipe extrusion molding cooling device according to claim 1, characterized in that: The partition layer (15) is a heat insulation layer, the inner cavity of the partition layer (15) is locally arranged, and the material of the partition layer (15) is a silicon dioxide aerogel composite material.

10. The CPVC large-diameter pipe extrusion molding cooling device according to claim 1, characterized in that: The reinforcing ribs (16) are made of titanium alloy, radially penetrate the partition (15), and are welded and fixed to the inner cavity of the auger rod (6) at both ends.

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