Extrusion thermoforming apparatus for the production of PVC pipes and method thereof

Abstract

An extrusion thermoplastic forming equipment for PVC pipe production and a method thereof include an internal buckle fixing mechanism, a mandrel replacement mechanism, a die replacement mechanism, a head internal cleaning mechanism and an extrusion head; by setting the internal buckle fixing mechanism, the mandrel replacement mechanism, the die replacement mechanism, the head internal cleaning mechanism and the extrusion head, the functions of fixing buckles, replacing mandrels, replacing dies and cleaning the inside of the head are integrated, when the equipment is used, the equipment is manually pushed between the extruder part and the water cooling part, the required die is selected, the required die is sent to the inside of the extrusion head and clamped by starting the die replacement mechanism, then the required mandrel is sent through the fixed die and into the extrusion head by starting the mandrel replacement mechanism, then the mandrel is fixed in the extrusion head by starting the internal buckle fixing mechanism, so that the replacement of the die and the mandrel is completed, and the head internal cleaning mechanism can clean the residual material in the inside of the head.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of hot plastic forming, in particular to an extrusion hot plastic forming equipment for PVC pipe production and a method thereof. BACKGROUND

[0002] PVC is a material mainly composed of polyvinyl chloride, with other components added to enhance its heat resistance, toughness, and ductility. The top layer of this surface film is paint, the main component in the middle is polyvinyl chloride, and the bottom layer is a back-coating adhesive. The production process mainly includes: first, the raw materials required for pipe production are uniformly mixed through a mixing system, including hot mixing and cold mixing, and then sent to an extruder.

[0003] A PVC pipe production extrusion hot plastic forming equipment is provided in Chinese patent CN216100298U, which includes a base, an extrusion box installed horizontally at the middle of the top end of the base, and a stirring box installed on one side of the top end of the extrusion box. A feed inlet is formed on one side of the top end of the stirring box. A servo motor output end is installed with a main stirring rod extending into the stirring box through a bearing. Excess air flows upward through the gap between the blocking ball and the fixed ring, and then is discharged through the exhaust hole to achieve automatic exhaust.

[0004] Through the study of the above-mentioned PVC pipe production extrusion hot plastic forming equipment, it is found that the stirring rod can only perform single stirring operation during the stirring process of the raw materials, and the outer wall diameter of the PVC pipe cannot be adjusted, nor can the pipe wall thickness be adjusted.

[0005] Therefore, there is an urgent need to invent an extrusion hot plastic forming equipment for PVC pipe production and a method thereof, which can automatically adjust the outer wall diameter of the PVC pipe and the pipe wall thickness by replacing the die and the mandrel. At the same time, it can clean the residual raw materials inside the head according to the needs, improve the work efficiency, and improve the utilization rate of the equipment. SUMMARY

[0006] In view of the above problems, the application provides an extrusion thermoplastic forming equipment for PVC pipe production and a method thereof, which integrates the functions of fixing a buckle, replacing a mandril, replacing a die and cleaning the inside of a head by arranging an internal buckle fixing mechanism, a mandril replacing mechanism, a die replacing mechanism, a head inside cleaning mechanism and an extruder head.

[0007] The technical scheme used in the application is: an extrusion thermoplastic forming equipment for PVC pipe production and a method thereof, which comprises: an internal buckle fixing mechanism, a mandril replacing mechanism, a die replacing mechanism, a head inside cleaning mechanism and an extruder head.

[0008] One end of the extruder head is connected with the extruder part, and the other end is connected with the die in the die replacing mechanism, the vertical rods in the internal buckle fixing mechanism are fixedly installed on the extruder head, each set of vertical rods has two vertical rods, and each set of vertical rods is located at the upper end and the lower end of the extruder head, the die replacing mechanism is located below the internal buckle fixing mechanism, the die replacing mechanism provides dies with different diameters, the mandril replacing mechanism is fixed on the box body of the equipment, different mandrils are arranged on the ring of the mandril replacing mechanism, the mandril located directly above the ring can pass through the die fixedly connected with the extruder head under the action of the screw rod group A and the clamp B, and the head inside cleaning mechanism is also arranged on the ring and reaches the top end of the equipment under the driving of the motor C and the ring and is driven into the extruder head to clean the inside of the extruder head under the driving of the screw rod group A.

[0009] When the equipment is used, the die in the extruder head and the mandril in the mandril replacing mechanism are replaced to change the outer wall diameter and the pipe wall thickness of the PVC pipe, the equipment is first pushed to the position between the extruder part and the water cooling part, the required die is selected, the required die is sent to the inside of the extruder head and clamped by starting the die replacing mechanism, the required mandril is sent to the inside of the extruder head and passes through the fixed die by starting the mandril replacing mechanism, the mandril is fixed in the extruder head by starting the internal buckle fixing mechanism, the die and the mandril are replaced, and finally the equipment is removed, and the extruder head is connected with the extruder part and the water cooling part.

[0010] Further, the internal buckle fixing mechanism comprises: a bidirectional screw rod group, a vertical rod, a support plate, a motor A, a gear A, a rack, a bent rod, a clamp A, a clamping rod, a motor B, a wrench, an electric cylinder and a screw.

[0011] The bidirectional screw rod group is fixed on the box, the vertical rods have two groups, each group has two, each group is fixedly installed on the upper end and the lower end of the extruder head respectively, two clamping rods are connected to the middle of the two vertical rods of the upper part and the lower part through screws, two supporting plates are fixed on the upper and lower sliding plates of the bidirectional screw rod group respectively, motor A is fixedly installed on the supporting plate, there are two gears A, a rack and a bent rod on the upper and lower supporting plates respectively, one of the gears A is fixedly connected with the shaft of motor A, the other gear A is rotatably connected with the extending shaft of the supporting plate, the two gears A are respectively engaged with the rack and the tooth part of the bent rod at the respective end, a clamp A is fixed at the tail of each bent rod, motor B is fixed at the tail side of the upper and lower sliding plates of the bidirectional screw rod group respectively, a wrench is rotatably connected with the rotating ring of motor B, an electric cylinder is fixed on the wrench, a screw is fixed on the electric cylinder, and the screw can pass through the aligned holes of the vertical rod and the clamping rod.

[0012] Further, the inductor fixing mechanism comprises: motor C, circular ring, screw rod group A, semi-ring rod and clamp B;

[0013] The motor C is fixedly installed on the equipment box, the teeth on the circular ring are engaged with the gear of the motor C, the screw rod group A is fixed on the box, the semi-ring rod is installed on the upper part of the screw rod group A, the clamp B is rotatably connected to the screw rod group A, and the circular ring is fixed with a sleeve that is provided with a mandrel.

[0014] Further, the circular ring is made of 45# steel after quenching and tempering.

[0015] Further, the die replacement mechanism comprises: motor D, bevel gear A, bevel gear B, clamping groove, screw rod group B, telescopic pipe, clamp C, arc-shaped gear, gear B and die;

[0016] The bevel gear A is fixedly connected with the shaft of the motor D, one end of the bevel gear B is engaged with the bevel gear A, and the other end is engaged with the teeth on the rotating plate of the clamping groove, the screw rod group B is fixed on the bottom surface of the equipment box and located between the mandrel replacement mechanism and the die replacement mechanism, the telescopic pipe is fixed on the sliding block of the screw rod group B, the clamp C is fixed on both ends of the arc-shaped wheel, the arc-shaped wheel is fixedly connected with the tail of the telescopic pipe through a thin rod, the arc-shaped gear is fixed on the arc-shaped wheel at the lower part of the clamp C, the gear B is located at the lower end of the connection between the extruder head and the die, and before replacing the die, the die is placed on the clamping groove.

[0017] Further, the internal cleaning mechanism of the head comprises: hollow rod, motor E, disc, scraping rod, spring, motor F, gear C, gear D and rotating cylinder;

[0018] The head internal cleaning mechanism is placed in the sleeve on the ring, wherein the hollow rod is in contact with the sleeve, the rotating cylinder is in rotating connection with the hollow rod, the disc is fixedly connected with the shaft of the motor E, the scraping rods are uniformly distributed on the circumferential edge of the disc and are fixedly connected with the spring on the disc through the hole on the disc, the motor F is fixed in the hollow rod, one end of the gear C is fixedly connected with the shaft of the motor F and the other end is engaged with the gear D, and the gear D is fixedly connected with the rotating cylinder through the fixing frame.

[0019] Further, the spring is made of 65Mn spring steel.

[0020] Due to the above technical scheme, the present application has the following advantages:

[0021] 1) The core rod changing mechanism and the die head changing mechanism are configured in the device, the die head and the core rod in the extrusion head are replaced, the outer wall diameter and the pipe wall thickness of the PVC pipe are changed, unlike the previous PVC pipe production equipment which can only produce PVC pipes with single outer wall diameter and pipe wall thickness, the use range of the equipment is expanded, the efficiency is increased and the cost is reduced.

[0022] 2) The head internal cleaning mechanism of the device can automatically clean the inside of the extrusion head, without manual cleaning, the head internal cleaning mechanism is arranged in the sleeve of the core rod changing mechanism and has the same transmission mode as the core rod, the inside of the extrusion head is automatically cleaned after the device is used or different PVC pipe models are produced, the equipment is effectively protected and the use efficiency of the equipment is improved. BRIEF DESCRIPTION OF DRAWINGS

[0023] Figures 1-2 It is a schematic diagram of the overall structure of the present application;

[0024] Figures 3-4 It is a schematic diagram of the internal buckle fixing mechanism of the present application;

[0025] Figure 5 It is a schematic diagram of the core rod changing mechanism of the present application;

[0026] Figures 6-7 It is a schematic diagram of the die head changing mechanism of the present application;

[0027] Figures 8-9 It is a schematic diagram of the head internal cleaning mechanism of the present application;

[0028] Reference signs: 1-internal buckle fixing mechanism; 2-core rod replacement mechanism; 3-die replacement mechanism; 4-machine head internal cleaning mechanism; 5-extrusion machine head; 101-two-way screw rod group; 102-vertical rod; 103-supporting plate; 104-motor A; 105-gear A; 106-rack; 107-bent rod; 108-clip A; 109-clamping rod; 110-motor B; 111-wrench; 112-electric cylinder; 113-screw; 201-motor C; 202-ring; 203-screw rod group A; 204-semi-ring rod; 205-clip B; 301-motor D; 302-bevel gear A; 303-bevel gear B; 304-clamping groove; 305-screw rod group B; 306-telescopic tube; 307-clip C; 308-shaped gear; 309-gear B; 310-die; 401-hollow rod; 402-motor E; 403-disc; 404-scraping rod; 405-spring; 406-motor F; 407-gear C; 408-gear D; 409-rotating cylinder. DETAILED DESCRIPTION

[0029] The technical solutions of the present application will be further described in detail below by examples, and in conjunction with the drawings. In the following description, many specific details are set forth in order to provide a thorough understanding of the present application, but the present application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without departing from the spirit of the present application, therefore the present application is not limited by the specific examples disclosed below.

[0030] In the description of the present application, it should be noted that the terms "upper", "lower", "front", "rear", "left", "right" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship when the product of the present application is usually placed, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, therefore it cannot be understood as a limitation on the present application.

[0031] As shown in the examples, Figures 1-9 An extrusion thermoplastic forming device for PVC pipe production and a method thereof, characterized in that it comprises: an internal buckle fixing mechanism 1, a core rod replacement mechanism 2, a die replacement mechanism 3, a machine head internal cleaning mechanism 4 and an extrusion machine head 5.

[0032] The extruder head 5 is externally connected with an extruder at one end and connected with a die 310 in the die changing mechanism 3 at the other end, the vertical rods 102 in the internal buckle fixing mechanism 1 are fixedly installed on the extruder head 5, the vertical rods 102 have two sets, each set has two, and each set is located at the upper end and the lower end of the extruder head 5 respectively, the die changing mechanism 3 is located below the internal buckle fixing mechanism 1, the die changing mechanism 3 provides the die 310 with different diameters, the mandrel changing mechanism 2 is fixed on the box body of the equipment, the circular ring 202 is provided with mandrels with different diameters, the mandrel located directly above the circular ring 202 can pass through the die 310 fixedly connected with the extruder head 5 under the action of the lead screw set A 203 and the clamp B 205, and the internal head cleaning mechanism 4 is also installed on the circular ring 202 and reaches the top end of the equipment under the driving of the motor C 201 and the circular ring 202, and enters the extruder head 5 for cleaning under the driving of the lead screw set A 203;

[0033] When the device is used, the outer wall diameter and the wall thickness of the PVC pipe are changed by replacing the die 310 in the extruder head 5 and the mandrel in the mandrel changing mechanism 2, the device is first pushed to the position between the extruder part and the water cooling part, the required die 310 is selected, the required die 310 is sent to the inside of the extruder head 5 and clamped by starting the die changing mechanism 3, then the required mandrel is sent to the inside of the extruder head 5 by starting the mandrel changing mechanism 2, and the mandrel is fixed in the extruder head 5 by starting the internal buckle fixing mechanism 1, so that the replacement of the die 310 and the mandrel is completed, and finally the device is removed, leaving the extruder head 5 externally connected with the extruder part and the water cooling part respectively, and the PVC pipe with the required outer wall diameter and wall thickness is produced.

[0034] In an optional embodiment of the embodiment of the application, as shown in Figures 3-4 The internal buckle fixing mechanism 1 includes a bidirectional lead screw set 101, a vertical rod 102, a support plate 103, a motor A 104, a gear A 105, a rack 106, a bent rod 107, a clamp A 108, a clamping rod 109, a motor B 110, a wrench 111, an electric cylinder 112 and a screw 113.

[0035] The bidirectional screw group 101 is fixed on the box, the vertical rod 102 has two groups, each group has two, each group is fixedly installed on the upper end and the lower end of the extruder head 5 respectively, two clamping rods 109 are connected to the middle of the upper and lower vertical rods 102 through screws 113 respectively, two supporting plates 103 are fixed on the upper and lower sliding plates of the bidirectional screw group 101 respectively, the motor A 104 is fixedly installed on the supporting plate 103, there are two gears A 105, a rack 106 and a bent rod 107 on the upper and lower supporting plates 103 respectively, one of the gears A 105 is fixedly connected with the shaft of the motor A 104, the other gear A 105 is rotatably connected with the extending shaft of the supporting plate 103, the two gears A 105 are respectively meshed with the tooth parts of the rack 106 and the bent rod 107 at the respective ends, a clamp A 108 is fixed at the tail of each bent rod 107, the motor B 110 is fixed at the tail side of the upper and lower sliding plates of the bidirectional screw group 101 respectively, the wrench 111 is rotatably connected with the rotating ring of the motor B 110, the electric cylinder 112 is fixed on the wrench 111, and the screw 113 is fixed on the electric cylinder 112 and can pass through the aligned holes of the vertical rod 102 and the clamping rod 109;

[0036] The initial position of the clamping rod 109 is that the screw 113 is screwed in a threaded hole on the vertical rod 102, when the clamping rod 109 is adjusted and fixed, first, the equipment is manually pushed to the position between the extruder part and the water cooling part, so that the two clamps A 108 on the internal clamping buckle fixing mechanism 1 on the equipment are located at the side of the two protruding rods on the clamping rod 109, then the motor A 104 is started to drive the gear A 105 to rotate, the gear A 105 drives the rack 106 to move, the rack 106 drives the bent rod 107 to move, and the bent rod 107 drives the clamp A 108 to move inward, so that the clamp A 108 clamps the protruding rod on the clamping rod 109, at this time, the special clamping groove at the end of the piston rod of the electric cylinder 112 is clamped at the outer end of the screw 113, then the motor B 110 is started to drive the wrench 111 to rotate, the rotation of the wrench 111 drives the screw 113 to move outward and disengage from the control of the clamping rod 109 and the vertical rod 102, then the bidirectional screw group 101 works to drive the supporting plate 103 and the mechanism thereon to move, the supporting plate 103 moves to drive the clamping rod 109 to move to the appropriate position, then the electric cylinder 112 works to push the screw 113 into the corresponding threaded hole on the electric cylinder 112, so that the threads on the screw 113 cooperate with the threaded holes on the electric cylinder 112, then the motor B 110 works to drive the wrench 111 to rotate, so that the screw 113 passes through the aligned holes of the vertical rod 102 and the clamping rod 109, and the clamping rod 109 is fixed to the appropriate position.

[0037] In an optional embodiment of the embodiment of the present application, as shown in Figure 5 The inductor fixing mechanism 2 includes a motor C 201, a circular ring 202, a screw group A 203, a semi-ring-shaped rod 204 and a clamp B 205.

[0038] The motor C201 is fixedly installed on the equipment box, the teeth on the ring 202 are engaged with the gear of the motor C201, the screw rod set A203 is fixed on the box, the semi-ring-shaped rod 204 is installed on the upper portion of the screw rod set A203, the clamp B205 is rotatably connected to the screw rod set A203, and the sleeve with the core rod is fixed on the ring 202;

[0039] When the core rod of different thickness is replaced, the motor C201 is started to drive the ring 202 to rotate, so that the core rod of the required thickness is moved to the highest point of the ring 202, then the clamp B205 clamps the core rod, the screw rod set A203 works to drive the clamp B205 to move, the clamp B205 drives the clamped core rod to move into the extrusion head 5, so that the clamping rod on the core rod passes through the hole in the lower end plate of the clamping rod 109, then, since the front end of the semi-ring-shaped rod 204 is provided with a slant groove, when the clamp B205 moves to the slant groove, the clamp B205 rotates a small distance along the slant groove on the semi-ring-shaped rod 204, at this time, the clamp B205 drives the core rod to rotate a small distance, so that the core rod is clamped on the clamping rod 109, and thus the core rod is fixed.

[0040] In an optional embodiment of the embodiment of the application, as shown in Figures 6-7 The die replacement mechanism 3 comprises a motor D301, a bevel gear A302, a bevel gear B303, a clamping groove 304, a screw rod set B305, an extension tube 306, a clamp C307, an arc-shaped gear 308, a gear B309 and a die 310.

[0041] The bevel gear A302 is fixedly connected with the shaft of the motor D301, one end of the bevel gear B303 is engaged with the bevel gear A302, and the other end is engaged with the teeth on the rotating plate of the clamping groove 304, the screw rod set B305 is fixed on the bottom surface of the equipment box and located between the core rod replacement mechanism 2 and the die replacement mechanism 3, the extension tube 306 is fixed on the sliding block of the screw rod set B305, the clamp C307 is fixed on both ends of the arc-shaped gear, the arc-shaped gear is fixedly connected with the tail of the extension tube 306 through a thin rod, the arc-shaped gear 308 is fixed on the arc-shaped gear below the clamp C307, the gear B309 is located at the lower end of the connection between the extrusion head 5 and the die 310, and before the die 310 is replaced, the die 310 is placed on the clamping groove 304.

[0042] The outer wall diameter of the extruded PVC pipe is adjusted by replacing the die 310 of different thicknesses, when the die 310 is replaced, the motor D301 is started to drive the bevel gear A302 to rotate, the bevel gear A302 drives the bevel gear B303 to rotate, the bevel gear B303 drives the clamping groove 304 to rotate, when the die 310 is replaced, the corresponding clamping groove 304 is rotated to the front end of the screw group B305, at this time, the clamp C307 is located at the lower end of the corresponding die 310, then the screw group B305 works to drive the clamp C307 to move upwards, the clamp C307 drives the corresponding die 310 to move upwards to the side of the extrusion head 5, then the electric cylinder on the side of the telescopic pipe 306 drives the arc-shaped gear 308 to move, so that the arc-shaped gear 308 is inserted into the extrusion head 5, at this time, the protruding rod on the die 310 enters the round hole of the extrusion head 5, at this time, the arc-shaped gear 308 is engaged with the gear B309, then the gear B309 rotates a small distance to drive the arc-shaped gear 308 to rotate, the arc-shaped gear 308 drives the clamp C307 to rotate a small distance, so that the die 310 is clamped in the extrusion head 5.

[0043] In an optional embodiment of the embodiment of the application, as shown in Figures 8-9 The internal cleaning mechanism 4 of the head includes a hollow rod 401, a motor E402, a disc 403, a scraping rod 404, a spring 405, a motor F406, a gear C407, a gear D408 and a rotating cylinder 409.

[0044] The internal cleaning mechanism 4 of the head is placed in the sleeve on the circular ring 202, wherein the hollow rod 401 is in contact with the sleeve, the rotating cylinder 409 is rotationally connected with the hollow rod 401, the disc 403 is fixedly connected with the shaft of the motor E402, the scraping rods 404 are uniformly distributed on the circumferential edge of the disc 403 and are fixedly connected with the springs 405 on the disc 403 through the holes on the disc 403, the motor F406 is fixedly arranged in the hollow rod 401, one end of the gear C407 is fixedly connected with the shaft of the motor F406 and the other end is engaged with the gear D408, and the gear D408 is fixedly connected with the rotating cylinder 409 through a fixing frame.

[0045] The rotating cylinder 409 is sleeved in the hollow rod 401, and the two are rotationally connected. When the inside of the machine head is cleaned, first, the mechanism is rotated to the highest point of the ring 202, at which time the spring 405 is most relaxed. Then, the motor E 402 is started to drive the disc 403 to rotate, and the disc 403 drives the scraper rod 404 to move downward to the most inside state. Then, the clamp B 205 clamps the hollow rod 401 to move to the inside of the extruding machine head 5. Then, the motor E 402 is reversely rotated to make the scraper rod 404 move outward to a relatively outer state, at which time the spring 405 is in a semi-extruding state. Then, the clamp B 205 drives the cleaning mechanism to move outward to scrape off the raw materials inside the machine head. Since there are gaps between the plurality of scraper rods 404, the rotating cylinder 409 needs to be rotated to ensure that the raw materials inside the machine head can be completely scraped off. When the rotating cylinder 409 is rotated, the motor F 406 is started to drive the gear C 407 to rotate, the gear C 407 drives the gear D 408 to rotate, and the gear D 408 drives the rotating cylinder 409 to rotate to completely scrape off the raw materials inside the machine head.

Claims

1. An extrusion thermoplastic molding apparatus for PVC pipe production and a method thereof, characterized in that, Include: Internal buckle fixed mechanism (1), core rod replacement mechanism (2), die replacement mechanism (3), head internal cleaning mechanism (4) and extrusion head (5); The extrusion head (5) is externally connected to the extruder part at one end, and the other end is connected with the die (310) in the die replacement mechanism (3), the vertical rod (102) in the internal buckle fixed mechanism (1) is fixedly installed on the extrusion head (5), the vertical rod (102) has two sets, each set has two, each set is located at the upper end and the lower end of the extrusion head (5) respectively, the die replacement mechanism (3) is located below the internal buckle fixed mechanism (1), the die replacement mechanism (3) provides different diameter dies (310), the core rod replacement mechanism (2) is fixed on the box body of the device, the different thickness core rods are installed on the circular ring (202), the core rod located directly above the circular ring (202) can pass through the die (310) which has been fixedly connected with the extrusion head (5) under the action of the lead screw group A (203) and the clamp B (205), the head internal cleaning mechanism (4) is also installed on the circular ring (202), reaches the top end of the device under the driving of the motor C (201) and the circular ring (202), enters the extrusion head (5) for cleaning under the driving of the lead screw group A (203); The core rod replacement mechanism (2) comprises: motor C (201), circular ring (202), lead screw group A (203), semi-ring rod (204) and clamp B (205); The motor C (201) is fixedly installed on the device box body, the teeth on the circular ring (202) are engaged with the gear of the motor C (201), the lead screw group A (203) is fixed on the box body, the semi-ring rod (204) is installed on the upper part of the lead screw group A (203), the clamp B (205) is rotatably connected to the lead screw group A (203), and the sleeve with the core rod is fixed on the circular ring (202). The die replacement mechanism (3) comprises a motor D (301), a bevel gear A (302), a bevel gear B (303), a clamping groove (304), a screw group B (305), a telescopic tube (306), a clip C (307), an arc-shaped gear (308), a gear B (309) and a die (310); the bevel gear A (302) is fixedly connected with the shaft of the motor D (301); the bevel gear B (303) is engaged with the bevel gear A (302) at one end and is engaged with the teeth on the rotating plate of the clamping groove (304) at the other end; the screw group B (305) is fixed on the bottom surface of the equipment box and is located in the middle of the core rod replacement mechanism (2) and the die replacement mechanism (3); the telescopic tube (306) is fixed on the sliding block of the screw group B (305); the clip C (307) is fixed on the two ends of the arc-shaped gear; the arc-shaped gear is fixedly connected with the tail of the telescopic tube (306) through a thin rod; the arc-shaped gear (308) is fixed on the arc-shaped gear at the lower part of the clip C (307); the gear B (309) is located at the lower end of the connection between the extrusion head (5) and the die (310); before replacing the die (310), the die (310) is placed on the clamping groove (304).

2. An extrusion thermoplastic forming apparatus for PVC pipe production and method thereof according to claim 1, characterized in that, The internal buckle fixing mechanism (1) comprises a bidirectional screw group (101), a vertical rod (102), a support plate (103), a motor A (104), a gear A (105), a rack (106), a bent rod (107), a clip A (108), a clamping rod (109), a motor B (110), a wrench (111), an electric cylinder (112) and a screw (113). The bidirectional screw group (101) is fixed on the box; the vertical rod (102) has two groups, each group has two, and each group is fixedly installed on the upper end and the lower end of the extrusion head (5); two clamping rods (109) are connected to the middle of the two vertical rods (102) at the upper end and the lower end through the screw (113); two support plates (103) are fixed on the upper and lower sliding plates of the bidirectional screw group (101); the motor A (104) is fixedly installed on the support plate (103); there are two gears A (105), racks (106) and bent rods (107) on the upper and lower support plates (103) respectively; one gear A (105) is fixedly connected with the shaft of the motor A (104); the other gear A (105) is rotatably connected with the support plate (103) extending shaft; the two gears A (105) are respectively engaged with the teeth of the rack (106) and the bent rod (107) at the respective end; one clip A (108) is fixed at the tail of each bent rod (107); the motor B (110) is fixed at the tail side of the upper and lower sliding plates of the bidirectional screw group (101); the wrench (111) is rotatably connected with the rotating ring of the motor B (110); the electric cylinder (112) is fixed on the wrench (111); the screw (113) is fixed on the electric cylinder (112) and can pass through the aligned holes of the vertical rod (102) and the clamping rod (109).

3. The extrusion thermoplastic forming apparatus for PVC pipe production and method thereof according to claim 1, wherein, The circular ring (202) is made of 45# steel after quenching and tempering.

4. The extrusion thermoforming apparatus for PVC pipe production and the method thereof according to any one of claims 1-3, characterized in that, The inside cleaning mechanism (4) of the machine head comprises a hollow rod (401), a motor E (402), a disc (403), a scraping rod (404), a spring (405), a motor F (406), a gear C (407), a gear D (408) and a rotating cylinder (409). The inside cleaning mechanism (4) of the machine head is placed in a sleeve on the circular ring (202), wherein the hollow rod (401) is in contact with the sleeve, the rotating cylinder (409) is rotationally connected with the hollow rod (401), the disc (403) is fixedly connected with the shaft of the motor E (402), the scraping rods (404) are evenly distributed on the circumferential edge of the disc (403) and are fixedly connected with the springs (405) on the disc (403) through the holes on the disc (403), the motor F (406) is fixed inside the hollow rod (401), one end of the gear C (407) is fixedly connected with the shaft of the motor F (406) and the other end is engaged with the gear D (408), and the gear D (408) is fixedly connected with the rotating cylinder (409) through a fixing frame.

5. An extrusion thermoplastic forming apparatus for PVC pipe production and method thereof according to claim 4, characterized in that, The spring (405) is made of 65Mn spring steel.

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