Chlorinated polyvinyl chloride composite pipe extrusion molding equipment

Abstract

The invention relates to the field of pipe manufacturing equipment, in particular to chlorinated polyvinyl chloride composite pipe extrusion molding equipment which comprises an extruder, a mold is connected to the discharging end of the right side of the extruder through a flange, and the right side of a flange plate of the mold is connected with a support through a flange. According to the device, airflow is blown out upwards through air holes in a semicircular cover at the lower part by adopting a circulating air assembly, so that the airflow flows from bottom to top and drives heat on the outer side surface of the CPVC pipe, and meanwhile, a rotating pipe is driven to rotate through a rotating assembly, so that the heat on the outer side surface of the CPVC pipe is reduced; and the rotating pipe pushes heat on the inner side face of the pipe to the interior of the rotating pipe through the first spiral blade and discharges the heat to the right side to the position of the vacuum sizing cooling device, so that the temperature of the outer side and the inner side of the CPVC pipe is synchronously reduced, the CPVC pipe can be pre-cooled, and the problems that the temperature difference between the inner side and the outer side is increased, and stress concentration occurs can be solved.

Description

Technical Field

[0001] The present invention relates to the field of pipe manufacturing equipment, and specifically to an extrusion molding equipment for chlorinated polyvinyl chloride composite pipes. Background Art

[0002] Chlorinated polyvinyl chloride composite pipes are abbreviated as CPVC composite pipes. Due to their excellent heat resistance, outstanding corrosion resistance, good flame retardancy, and relatively high mechanical strength, they are applied in multiple fields.

[0003] CPVC composite pipes are generally manufactured by extrusion molding. The CPVC raw material is continuously extruded into the interior of a mold through an extruder, causing the CPVC raw material to form a tube. Subsequently, the high-temperature tubular CPVC is introduced into a vacuum sizing and cooling device to shape and cool the tubular CPVC, thereby forming a CPVC composite pipe.

[0004] However, the temperature of the CPVC pipe after extrusion is relatively high. If the CPVC pipe with too high a temperature directly enters the vacuum sizing and cooling device, it may cause the surface of the pipe to cool rapidly while the interior remains at a high temperature, generating a large internal stress, which affects the performance and dimensional stability of the pipe. Currently, when initially cooling the extruded CPVC pipe by means of spraying and air cooling, only the outer side surface can be cooled. If the wall thickness of the CPVC pipe is relatively thick, it is easy for the inner side surface temperature of the CPVC pipe to remain relatively high, and it is also easy to cause an increase in the temperature difference between the inside and outside of the CPVC pipe, resulting in a problem of stress concentration. In addition, when the CPVC pipe is extruded, due to its relatively high temperature and strong plasticity, under the action of gravity, the just-extruded CPVC pipe will show a phenomenon of sagging and deformation, thereby resulting in a poor subsequent cooling and shaping effect of the CPVC pipe.

[0005] Therefore, there is an urgent need for an extrusion molding equipment that can simultaneously pre-cool and cool the inner and outer side surfaces of the extruded CPVC pipe and prevent the CPVC pipe from sagging and deforming. Summary of the Invention

[0006] To solve the above technical problems, the technical solution adopted by the present invention is: an extrusion molding equipment for chlorinated polyvinyl chloride composite pipes, including an extruder. A mold is connected to the right discharge end of the extruder through a flange. A bracket is connected to the right side of the flange of the mold through a flange. A pre-cooling mechanism for cooling the inner and outer side surfaces of the pipe is jointly provided on the bracket and the mold.

[0007] The pre-cooling mechanism includes two semi-circular covers that are symmetrically arranged up and down and fixedly installed on the right side of the bracket. One side of the two semi-circular covers that is close to each other is fixedly connected together. An arc-shaped space is provided inside the semi-circular cover. A number of air holes are provided on the arc-shaped surfaces of the two semi-circular covers on the side close to each other. A circulating air component for guiding air between the two semi-circular covers is provided on the two semi-circular covers and the bracket.

[0008] The pre-cooling mechanism further includes a rotating tube rotatably arranged on the right side of the mandrel of the mold. A first helical blade is fixedly connected to the outer side of the middle part of the rotating tube. The outer diameter of the helix of the first helical blade is smaller than the outer diameter of the mandrel of the mold. The pre-cooling mechanism further includes a rotating component for driving the rotating tube, and the pre-cooling mechanism further includes a gas guiding component for driving the internal circulating air supply and cooling of the pipe.

[0009] The circulating air component blows the air flow upward through the air holes on the lower semi-circular cover, so that the air flow flows from bottom to top and drives the heat on the outer side of the pipe. Subsequently, the air flow flows into the internal of the circulating air component through the air holes on the upper semi-circular cover for cooling and then recirculation.

[0010] As a preferred technical solution of the present invention, the air holes on the semi-circular cover are arranged in a matrix on the semi-circular cover, and the distance between the air holes that gradually move away from the middle of the semi-circular cover in the left-right direction gradually increases, and the air holes are all arranged vertically.

[0011] As a preferred technical solution of the present invention, the circulating air component includes a fan fixedly installed on the front right side of the bracket. The air suction port of the fan is communicated with the arc-shaped space of the upper semi-circular cover through a number of first pipes, and the air supply port of the fan is communicated with the arc-shaped space of the lower semi-circular cover through a number of second pipes.

[0012] As a preferred technical solution of the present invention, heat dissipation fins are fixedly connected together on the outer side of the upper part of the first pipe, and a number of exhaust fans are fixedly installed on the upper part of the heat dissipation fins.

[0013] As a preferred technical solution of the present invention, an arc-shaped partition that divides the arc-shaped space into upper and lower parts is fixedly installed inside the arc-shaped space of the lower semi-circular cover. A number of through holes arranged left and right are provided in the middle of the arc-shaped partition. The distance between the through holes that gradually move away from the middle of the semi-circular cover in the left-right direction gradually increases, and the through holes are arranged in a staggered manner with the air holes at the corresponding positions.

[0014] As a preferred technical solution of the present invention, the rotating component includes a permanent magnet wheel fixedly installed on the outer side of the right part of the rotating tube. A conductor wheel is rotatably arranged on the right side of the two semi-circular covers. The conductor wheel is located outside the permanent magnet wheel. An execution motor that drives the conductor wheel to rotate through a belt is fixedly installed on the rear side of the bracket.

[0015] As a preferred technical solution of the present invention, the air guiding assembly includes a rotating rod rotatably arranged on the right side of the mandrel of the mold. A second spiral blade is fixedly installed on the outer side of the rotating rod. The second spiral blade is located inside the rotating tube. The spiral direction of the second spiral blade is opposite to that of the first spiral blade. A through groove communicating the inside and outside is equidistantly arranged along the circumferential direction on the left side of the rotating tube. The air guiding assembly further includes a linkage part for synchronously and reversely rotating the rotating tube and the rotating rod.

[0016] As a preferred technical solution of the present invention, the linkage part includes an external gear ring fixedly installed on the left side of the rotating tube. A central gear is fixedly installed on the left side of the rotating rod. A planetary gear is rotatably arranged on the right side of the mandrel of the mold. The planetary gear is located between the external gear ring and the central gear and meshes with the external gear ring and the central gear.

[0017] As a preferred technical solution of the present invention, two windshields symmetrically arranged front and back are hinged inside the lower semi-circular cover. An active plate is slidably arranged up and down inside the arc-shaped space of the lower semi-circular cover. The active plate is simultaneously hinged to the two windshields through two connecting plates. A first screw rod is threadedly connected to the lower semi-circular cover. The lower part of the first screw rod is rotatably connected to the active plate.

[0018] As a preferred technical solution of the present invention, two symmetrically arranged sliding frames are slidably arranged on the bracket in the vertical direction. Two sealing plates symmetrically arranged left and right for blocking the left and right ends of the two semi-circular covers are fixedly installed on the side of the sliding frames close to each other. Two second screw rods symmetrically arranged up and down are threadedly connected to the bracket. The second screw rods are rotatably connected to the corresponding sealing plates.

[0019] The beneficial effects of the present invention are as follows: First, the present invention uses a circulating air component to blow the air flow upward through the air holes on the lower semi-circular cover, so that the air flow flows from bottom to top and drives the heat on the outer side of the CPVC pipe. At the same time, the rotating component drives the rotating tube to rotate, so that the rotating tube pushes the heat on the inner side of the pipe to the inside of the rotating tube through the first spiral blade and discharges it to the position of the vacuum sizing and cooling device on the right side, so that the temperatures on the outer and inner sides of the CPVC pipe are synchronously reduced. Furthermore, it can not only pre-cool the CPVC pipe, but also avoid the problem of increased internal and external temperature difference and stress concentration.

[0020] Second, the present invention uses vertically arranged air holes, so that the air flow can move vertically upward, so that the air flow can support the extruded CPVC pipe in a non-contact manner. Thus, while pre-cooling the CPVC pipe, it can prevent the CPVC pipe from sagging and bending due to gravity, ensuring the straightness of the CPVC pipe during pre-cooling and ensuring the subsequent cooling and sizing effect of the CPVC pipe.

[0021] III. The present invention arranges the air holes in such a way that the spacing between the air holes gradually increases in the left - right direction and gradually moves away from the middle of the semi - circular cover. This can make the air flow blown out from the air holes closer to the middle of the semi - circular cover greater than that away from the middle of the semi - circular cover. As a result, the position where the middle part of the CPVC pipe between the mold and the vacuum sizing and cooling device sags significantly receives a greater supporting force, and thus can better ensure the straightness of the CPVC pipe during pre - cooling.

[0022] IV. The present invention uses the first spiral blade to push the heat inside the CPVC pipe from right to left, so that the heat of the CPVC pipe just extruded to the right side of the mold can be immediately pushed into the interior of the rotating pipe, effectively preventing the heat inside the CPVC pipe from conducting to the right side. Thus, the inner side of the CPVC pipe can be quickly cooled, and then the heat is introduced to the position of the vacuum sizing and cooling device through the air - guiding component for cooling to prevent heat circulation.

[0023] V. The present invention uses the wind - blocking plate that can move to a certain distance from the outside of the CPVC pipe, thereby shielding a certain position on the outside of the CPVC pipe. As a result, the air flow blown on the lower semi - circular cover can move upward along the outside of the CPVC pipe, better taking away the heat on the outside of the CPVC pipe. Moreover, the air flow can pass through the front and rear sides of the CPVC pipe, exerting pressure on the front and rear sides of the CPVC pipe to prevent the upper side of the CPVC pipe from being flattened due to gravity. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] The present invention will be further described below in conjunction with the drawings and embodiments.

[0025] Figure 1 It is a schematic diagram of the overall structure of the present invention.

[0026] Figure 2 It is a schematic diagram of the structure of the mold and the bracket in the present invention.

[0027] Figure 3 It is a schematic diagram of the structure of the bracket, the sliding frame, the sealing plate and the second screw in the present invention.

[0028] Figure 4 It is a schematic diagram of the structure of the mold, the bracket and the pre - cooling mechanism after removing the sealing plate in the present invention.

[0029] Figure 5 It is a cross - sectional view of the semi - circular cover, the fan, the first pipe, the second pipe and the arc - shaped partition in the present invention.

[0030] Figure 6 It is a cross - sectional view of the semi - circular cover and the arc - shaped partition in the present invention.

[0031] Figure 7It is a cross-sectional view of the semi-circular cover, wind deflector, active plate, connecting plate and the first screw rod in the present invention.

[0032] Figure 8 It is a cross-sectional view of the mold, rotating pipe, first spiral blade and air guiding assembly in the present invention.

[0033] Figure 9 It is a partial cross-sectional view of the mold, rotating pipe, rotating rod and linkage part in the present invention.

[0034] Figure 10 It is a schematic structural diagram of the rotating pipe and the first spiral blade in the present invention.

[0035] In the figure: 1. Extruder; 2. Mold; 3. Bracket; 4. Pre-cooling mechanism; 41. Semi-circular cover; 42. Arc-shaped space; 43. Circulating air assembly; 44. Rotating pipe; 45. First spiral blade; 46. Rotating assembly; 47. Air guiding assembly; 48. Wind deflector; 49. Sliding frame; 411. Air hole; 431. Fan; 432. First pipe; 433. Second pipe; 434. Heat dissipation fins; 435. Exhaust fan; 436. Arc-shaped partition; 437. Through hole; 461. Permanent magnet wheel; 462. Conductor wheel; 463. Execution motor; 471. Rotating rod; 472. Second spiral blade; 474. Linkage part; 481. Active plate; 482. Connecting plate; 483. First screw rod; 491. Sealing plate; 492. Second screw rod; 4741. Outer gear ring; 4742. Central gear; 4743. Planet gear. Detailed implementation manners

[0036] The embodiments of the present invention will be described in detail below. The described embodiments are exemplary and are only used to explain the present invention, and should not be construed as a limitation to the present invention. For those not specified in the embodiments regarding specific technologies or conditions, they shall be carried out according to the technologies or conditions described in the literature in the field or according to the product manuals.

[0037] Refer to Figure 1 、 Figure 2 and Figure 4 A chlorinated polyvinyl chloride composite pipe extrusion molding device includes an extruder 1. The right discharge end of the extruder 1 is connected to a mold 2 through a flange. The right flange of the mold 2 is connected to a bracket 3 through a flange. A pre-cooling mechanism 4 for cooling the inner and outer sides of the pipe is jointly provided on the bracket 3 and the mold 2.

[0038] When the CPVC pipe needs to be extruded and formed, first, the raw material is pushed into the interior of the mold 2 by the extruder 1. The mold 2 extrudes the passing raw material into a tubular shape. Subsequently, the extruded CPVC pipe moves to the pre-cooling mechanism 4, and the pre-cooling mechanism 4 synchronously pre-cools the inner and outer sides of the extruded CPVC pipe. Then, the CPVC pipe moves into the vacuum sizing and cooling device for cooling and shaping.

[0039] Refer to Figure 1 and Figure 3 As shown in and, the pre-cooling mechanism 4 includes two semi-circular covers 41 that are symmetrically arranged up and down and fixedly installed on the right side of the bracket 3. The mutually approaching sides of the two semi-circular covers 41 are fixedly connected together. Two symmetrically arranged sliding frames 49 are slidably arranged on the bracket 3 in the vertical direction. On the mutually approaching sides of the sliding frames 49, two symmetrically arranged sealing plates 491 are fixedly installed for blocking the left and right ends of the two semi-circular covers 41. Two symmetrically arranged second screw rods 492 are threadedly connected to the bracket 3, and the second screw rods 492 are rotatably connected to the corresponding sealing plates 491.

[0040] Refer to Figure 1 、 Figure 3 and Figure 4 As shown in, and, the pre-cooling mechanism 4 further includes a rotating assembly 46. The rotating assembly 46 includes a conductor wheel 462 that is rotatably arranged on the right sides of the two semi-circular covers 41. The right side surface of the left sealing plate 491 is attached to the left side surface of the corresponding semi-circular cover 41, and the left side surface of the right sealing plate 491 is attached to the right side surface of the conductor wheel 462. Semi-circular grooves with the same outer diameter as the mold 2 and the outer diameter of the CPVC pipe are respectively formed on the left sealing plate 491 and the right sealing plate 491.

[0041] When the extruded CPVC pipe passes through the semi-circular cover 41 and moves into the vacuum sizing and cooling device, the operator manually rotates the two second screw rods 492, so that the second screw rods 492 drive the semi-circular groove on the left sealing plate 491 to fit on the outer side surface of the mold 2. At the same time, the left sealing plate 491 drives the semi-circular groove of the right sealing plate 491 to fit on the outer side surface of the CPVC pipe through the sliding frame 49, and the mutually approaching sides of the upper and lower corresponding sealing plates 491 are attached together, so that the sealing plate 491 seals the space between the interior of the semi-circular cover 41 and the outer side of the CPVC pipe, thereby facilitating the removal of the heat on the outer side of the CPVC pipe by the airflow.

[0042] Refer to Figure 4 、 Figure 5 and Figure 6, an arc-shaped space 42 is provided inside the semi-circular cover 41. A plurality of air holes 411 are provided on the arc-shaped surfaces of the two semi-circular covers 41 on the sides close to each other. The air holes 411 on the semi-circular cover 41 are arranged in a matrix on the semi-circular cover 41, and the distance between the air holes 411 gradually increasing away from the middle of the semi-circular cover 41 in the left-right direction. The air holes 411 are all arranged vertically. A circulating air component 43 for guiding air between the two semi-circular covers 41 is provided on the two semi-circular covers 41 and the bracket 3 together.

[0043] Refer to Figure 4 and Figure 5 , the circulating air component 43 includes a blower 431 fixedly installed at the front part on the right side of the bracket 3. The air suction port of the blower 431 is communicated with the arc-shaped space 42 of the upper semi-circular cover 41 through a plurality of first pipes 432, and the air supply port of the blower 431 is communicated with the arc-shaped space 42 of the lower semi-circular cover 41 through a plurality of second pipes 433.

[0044] Refer to Figure 5 and Figure 6 , an arc-shaped partition 436 that divides its arc-shaped space 42 into upper and lower parts is fixedly installed inside the arc-shaped space 42 of the lower semi-circular cover 41. A plurality of through holes 437 arranged left and right are provided in the middle of the arc-shaped partition 436. The distance between the through holes 437 gradually increasing away from the middle of the semi-circular cover 41 in the left-right direction, and the through holes 437 are arranged in a staggered manner with the air holes 411 at the corresponding positions.

[0045] After the sealing plate 491 seals the space between the inside of the semi-circular cover 41 and the outside of the CPVC pipe, the blower 431 is started, so that the blower 431 sends high-speed air flow into the arc-shaped space 42 of the lower semi-circular cover 41 through the second pipes 433, so that the high-speed air flow fills the part of the lower arc-shaped space 42 located below the arc-shaped partition 436, and then the high-speed air flow flows through the through holes 437 on the arc-shaped partition 436 to the part of the lower arc-shaped space 42 located above the arc-shaped partition 436.

[0046] Since the through holes 437 in the middle of the semi-circular cover 41 are relatively dense in the left-right direction, the air volume flowing to the middle part above the arc-shaped partition 436 in the lower arc-shaped space 42 is relatively large, and since the through holes 437 are located in the middle of the semi-circular cover 41 in the front-back direction, the air volume at the center position of the semi-circular cover 41 is relatively large. Therefore, when the upward moving air flow blows to the outer side surface of the CPVC pipe through the moving air holes 411, the wind pressure received by the position of the CPVC pipe with a large downward trend in the middle of the semi-circular cover 41 is relatively large, and the upward moving air flow takes away the heat on the outside of the CPVC pipe, thereby cooling the outside of the CPVC pipe.

[0047] Furthermore, the through holes 437 arranged offset from the air holes 411 at the corresponding positions can prevent high-speed airflow from directly entering the air holes 411, so that all the air holes 411 can discharge air, thereby performing non-contact blowing support on various parts of the CPVC pipe, preventing the CPVC pipe from falling and deforming while cooling, and the air holes 411 arranged in a vertical state can make the airflow blow on the CPVC pipe from bottom to top, thereby ensuring that the CPVC pipe is always subjected to a supporting force from bottom to top, thereby preventing the CPVC pipe from producing irregular deformation.

[0048] See also Figure 4 and Figure 7 The interior of the lower semicircular cover 41 is hinged with two windshield plates 48 arranged symmetrically front and back, and an active plate 481 is set inside the arc-shaped space 42 of the lower semicircular cover 41 for sliding up and down. The active plate 481 is hinged to the two windshield plates 48 at the same time through two connecting plates 482. A No. 1 screw 483 is threadedly connected to the lower semicircular cover 41, and the lower part of the No. 1 screw 483 is rotatably connected to the active plate 481.

[0049] The operator turns the No. 1 screw 483 in advance, and the No. 1 screw 483 drives the active plate 481 to adjust the position. The active plate 481 simultaneously adjusts the angles of the two wind shields 48 through the connecting plate 482, so that the two wind shields 48 form an eight-shaped shape, and the two wind shields 48 are located on the front and rear sides of the CPVC pipe and there is a gap between the CPVC pipe. When the airflow blows to the lower side of the CPVC pipe, the airflow moves upward along the circumferential surface of the CPVC pipe, so that a part of the airflow is blown to the side surface where the two wind shields 48 are close to each other.

[0050] The airflow then moves along the side of the wind shield 48 toward the direction close to the CPVC pipe, so that the airflow blows to the front and rear sides of the CPVC pipe, and then the airflow continues to move upward along the front and rear sides of the CPVC pipe, which can not only better remove the heat on the outside of the CPVC pipe, but also enable the airflow to exert pressure on the front and rear sides of the CPVC pipe to prevent the upper side of the CPVC pipe from falling due to gravity and crushing the CPVC pipe.

[0051] See also Figure 4 The outer side of the upper portion of the No. 1 pipe 432 is fixedly connected with a heat dissipation fin 434 , and a plurality of exhaust fans 435 are fixedly installed on the upper portion of the heat dissipation fin 434 .

[0052] While the blower 431 blows air into the interior of the semi-circular cover 41 through the second pipe 433, the blower 431 extracts the air inside the arc-shaped space 42 of the upper semi-circular cover 41 through the first pipe 432, creating a negative pressure inside the arc-shaped space 42 of the upper semi-circular cover 41. As a result, the upper semi-circular cover 41 extracts the air above the CPVC pipe through the air holes 411 on it into the interior of the second pipe 433. Subsequently, the high-temperature air passes through the heat dissipation fins 434, and the rotating exhaust fan 435 dissipates the heat of the air flowing through the second pipe 433 by blowing the heat dissipation fins 434. Then, the cooled air circulates and cools the CPVC pipe again through the blower 431.

[0053] Moreover, since the arrangement of the air holes 411 on the upper semi-circular cover 41 is the same as that on the lower semi-circular cover 41, the upper semi-circular cover 41 extracts a relatively large amount of air from the middle position of the CPVC pipe. As a result, the air flow moves along the upper arc surface of the CPVC pipe, and thus the air flow is more comprehensively blown to every part of the circumferential surface of the CPVC pipe, ensuring uniform heat dissipation effect on the outer side of the CPVC pipe.

[0054] Refer to Figure 4 、 Figure 8 and Figure 10 Furthermore, the pre-cooling mechanism 4 further includes a rotating pipe 44 rotatably arranged on the right side of the mandrel of the mold 2. A first spiral blade 45 is fixedly connected to the outer side of the middle part of the rotating pipe 44. The spiral outer diameter of the first spiral blade 45 is smaller than the outer diameter of the mandrel of the mold 2. A through groove communicating the inside and outside is equally spaced along the circumferential direction on the left side of the rotating pipe 44. The rotating assembly 46 further includes a permanent magnet wheel 461 fixedly installed on the outer side of the right part of the rotating pipe 44. A conductor wheel 462 is located outside the permanent magnet wheel 461. An actuator motor 463 for driving the conductor wheel 462 to rotate by a belt is fixedly installed on the rear side of the bracket 3.

[0055] When the extruded CPVC pipe moves through the semi-circular cover 41 into the vacuum sizing and cooling device, the CPVC pipe covers the outside of the first spiral blade 45. Subsequently, the actuator motor 463 is started, and the actuator motor 463 drives the conductor wheel 462 to rotate. The conductor wheel 462 drives the permanent magnet wheel 461 to rotate synchronously in the same direction through magnetic coupling. The permanent magnet wheel 461 drives the rotating pipe 44 to rotate. The rotating pipe 44 pushes the air inside the CPVC pipe to the left through the first spiral blade 45. The air moving to the left drives the heat and synchronously moves the heat inside the CPVC pipe to the left, enabling the air to drive the heat to move through the through groove on the left side of the rotating pipe 44 into the interior of the rotating pipe 44.

[0056] Continue to refer to Figure 4 、 Figure 8 and Figure 10The precooling mechanism 4 also includes an air guide component 47 for driving the internal circulating air cooling of the pipe. The air guide component 47 includes a rotating rod 471 rotatably arranged on the right side of the core rod of the mold 2. A second spiral blade 472 is fixedly installed on the outer side of the rotating rod 471. The second spiral blade 472 is located inside the rotating tube 44. The spiral direction of the second spiral blade 472 is opposite to that of the first spiral blade 45. The air guide component 47 also includes a linkage part 474 that links the rotating tube 44 and the rotating rod 471 to rotate synchronously in the opposite direction.

[0057] See also Figure 8 and Figure 9 The linkage part 474 includes an outer gear ring 4741 fixedly installed on the left side of the rotating tube 44, a center gear 4742 is fixedly installed on the left side of the rotating rod 471, and a planetary gear 4743 is rotatably arranged on the right side of the core rod of the mold 2. The planetary gear 4743 is located between the outer gear ring 4741 and the center gear 4742 and meshes with the outer gear ring 4741 and the center gear 4742.

[0058] When the rotating tube 44 rotates, it drives the outer gear ring 4741 to rotate synchronously. The outer gear ring 4741 drives the central gear 4742 to rotate in the opposite direction through the planetary gear 4743. The central gear 4742 drives the rotating rod 471 to rotate, so that the rotating rod 471 moves the hot air entering the rotating tube 44 to the right through the second spiral blade 472, so that the hot air is blown to the inside of the vacuum sizing cooling device for cooling, and then the first spiral blade 45 drives the cooled gas to move to the left again along the outside of the CPVC pipe, thereby circulating and cooling the inside of the CPVC pipe.

[0059] When the CPVC pipe is extruded and formed, the present invention also includes the following steps: in the first step, the raw material is pushed into the mold 2 through the extruder 1, and the mold 2 extrude the raw material into a tube shape. Then the CPVC pipe moves through the interior of the semicircular cover 41 to the interior of the vacuum sizing and cooling device for cooling and shaping.

[0060] In the second step, the operator manually rotates the two No. 2 screws 492 so that the semicircular groove on the left sealing plate 491 fits against the outer surface of the mold 2, and the semicircular groove on the right sealing plate 491 fits against the outer surface of the CPVC pipe, so that the sealing plate 491 seals the space between the inside of the semicircular cover 41 and the outside of the CPVC pipe.

[0061] The third step is to start the fan 431 to blow high-speed airflow upward to the outer surface of the CPVC pipe. The CPVC pipe is located in the middle of the semicircular cover 41 where the downward tendency is large and is subject to greater wind pressure. The upward airflow takes away the heat on the outside of the CPVC pipe, thereby cooling the outside of the CPVC pipe.

[0062] In the fourth step, the air flow moves upward along the circumferential surface of the CPVC pipe, so that a part of the air flow blows onto one side where the two windshields 48 are close to each other. Subsequently, the air flow blows along the windshields 48 onto the front and rear side surfaces of the CPVC pipe, which can better take away the heat outside the CPVC pipe while enabling the air flow to exert pressure on the front and rear sides of the CPVC pipe, preventing the upper side of the CPVC pipe from sagging due to gravity and flattening the CPVC pipe.

[0063] In the fifth step, the fan 431 extracts the air inside the arc-shaped space 42 of the upper semi-circular cover 41 through the first pipe 432, so that the air inside the upper semi-circular cover 41 is extracted to the heat dissipation fins 434 for heat dissipation. Subsequently, the cooled air circulates through the fan 431 again to cool the CPVC pipe.

[0064] In the sixth step, the actuator motor 463 is started to drive the first spiral blade 45 and the second spiral blade 472 to rotate synchronously in opposite directions, so that the first spiral blade 45 pushes the air into the interior of the rotating pipe 44, and the second spiral blade 472 blows the hot air into the vacuum sizing and cooling device for cooling. Then, the first spiral blade 45 drives the cooled gas to move to the left again along the outside of the CPVC pipe, thereby circulatingly cooling the inside of the CPVC pipe.

[0065] Although the embodiments of the present invention have been shown and described above, it can be understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those of ordinary skill in the art can make changes, modifications, substitutions, and variations to the above embodiments within the scope of the present invention, and still be covered by the protection scope of the present invention.

Claims

1. A chlorinated polyvinyl chloride composite pipe extrusion molding device, comprising an extruder (1), wherein a mold (2) is connected to the right discharge end of the extruder (1) via a flange, wherein: The right side of the flange of the mold (2) is connected to a bracket (3) via a flange, and the bracket (3) and the mold (2) are jointly provided with a pre-cooling mechanism (4) for cooling the inner and outer sides of the pipe; The precooling mechanism (4) comprises two semicircular covers (41) which are symmetrically arranged up and down and fixedly mounted on the right side of the bracket (3); the two semicircular covers (41) are fixedly connected together on the sides close to each other; an arc-shaped space (42) is provided inside the semicircular covers (41); a plurality of air holes (411) are provided on the arc-shaped surfaces on the sides close to each other of the two semicircular covers (41); and a circulating air component (43) for guiding air between the two semicircular covers (41) is provided on the two semicircular covers (41) and the bracket (3); The precooling mechanism (4) further comprises a rotating tube (44) rotatably arranged on the right side of the core rod of the mold (2), a first spiral blade (45) being fixedly connected to the outer side of the middle part of the rotating tube (44), the spiral outer diameter of the first spiral blade (45) being smaller than the outer diameter of the core rod of the mold (2), the precooling mechanism (4) further comprises a rotating assembly (46) for driving the rotating tube (44), and the precooling mechanism (4) further comprises an air guide assembly (47) for driving the internal circulation of air for cooling of the pipe material; The circulating air component (43) blows the air flow upward through the air holes (411) on the lower semicircular cover (41), so that the air flow flows from bottom to top and brings the heat on the outer surface of the pipe. Then the air flow flows through the air holes (411) on the upper semicircular cover (41) to the inside of the circulating air component (43) for cooling and recycling.

2. The chlorinated polyvinyl chloride composite pipe extrusion molding equipment according to claim 1, characterized in that: The air holes (411) on the semicircular cover (41) are arranged in a matrix on the semicircular cover (41), and the spacing between the air holes (411) gradually increases as they gradually move away from the middle of the semicircular cover (41) in the left-right direction, and the air holes (411) are all arranged vertically.

3. The chlorinated polyvinyl chloride composite pipe extrusion molding equipment according to claim 1, characterized in that: The circulating air component (43) comprises a fan (431) fixedly mounted on the front right side of the bracket (3); an air outlet of the fan (431) is connected to the arc-shaped space (42) of the upper semicircular cover (41) through a plurality of No. 1 pipes (432); and an air supply outlet of the fan (431) is connected to the arc-shaped space (42) of the lower semicircular cover (41) through a plurality of No. 2 pipes (433).

4. The chlorinated polyvinyl chloride composite pipe extrusion molding equipment according to claim 3, characterized in that: The outer side of the upper portion of the No. 1 pipeline (432) is fixedly connected to a heat dissipation fin (434), and a plurality of exhaust fans (435) are fixedly installed on the upper portion of the heat dissipation fin (434).

5. The chlorinated polyvinyl chloride composite pipe extrusion molding equipment according to claim 1, characterized in that: An arc-shaped partition plate (436) is fixedly installed inside the arc-shaped space (42) of the lower semicircular cover (41) to divide the arc-shaped space (42) into two upper and lower parts. A plurality of through holes (437) arranged left and right are opened in the middle of the arc-shaped partition plate (436). The spacing between the through holes (437) gradually increases as they gradually move away from the middle of the semicircular cover (41) in the left and right directions, and the through holes (437) are staggered with the air holes (411) at corresponding positions.

6. The chlorinated polyvinyl chloride composite pipe extrusion molding equipment according to claim 1, characterized in that: The rotating assembly (46) comprises a permanent magnet wheel (461) fixedly mounted on the right outer side of the rotating tube (44); a conductor wheel (462) is arranged on the right side of the two semicircular covers (41) for co-rotation; the conductor wheel (462) is located on the outer side of the permanent magnet wheel (461); and an actuator motor (463) is fixedly mounted on the rear side of the bracket (3) for driving the conductor wheel (462) to rotate via a belt.

7. The chlorinated polyvinyl chloride composite pipe extrusion molding equipment according to claim 1, characterized in that: The air guide component (47) comprises a rotating rod (471) rotatably arranged on the right side of the core rod of the mold (2); a second spiral blade (472) is fixedly installed on the outer side of the rotating rod (471); the second spiral blade (472) is located inside the rotating tube (44); the spiral direction of the second spiral blade (472) is opposite to that of the first spiral blade (45); through grooves for connecting the inside and the outside of the rotating tube (44) are arranged at equal intervals on the left side along the circumference thereof; the air guide component (47) further comprises a linkage part (474) for linking the rotating tube (44) and the rotating rod (471) to rotate synchronously in opposite directions.

8. The chlorinated polyvinyl chloride composite pipe extrusion molding equipment according to claim 7, characterized in that: The linkage part (474) comprises an outer gear ring (4741) fixedly mounted on the left side of the rotating tube (44); a central gear (4742) is fixedly mounted on the left side of the rotating rod (471); a planetary gear (4743) is rotatably arranged on the right side of the core rod of the mold (2); the planetary gear (4743) is located between the outer gear ring (4741) and the central gear (4742) and meshes with the outer gear ring (4741) and the central gear (4742).

9. The chlorinated polyvinyl chloride composite pipe extrusion molding equipment according to claim 1, characterized in that: The lower semicircular cover (41) is internally hinged with two windshield plates (48) symmetrically arranged front and back, and an active plate (481) is provided inside the arc-shaped space (42) of the lower semicircular cover (41) to slide up and down, and the active plate (481) is hinged with the two windshield plates (48) at the same time through two connecting plates (482), and a No. 1 screw rod (483) is threadedly connected to the lower semicircular cover (41), and the lower part of the No. 1 screw rod (483) is rotatably connected to the active plate (481).

10. The chlorinated polyvinyl chloride composite pipe extrusion molding equipment according to claim 1, characterized in that: The bracket (3) is provided with two symmetrically arranged sliding frames (49) sliding in the vertical direction, and two sealing plates (491) arranged symmetrically on the left and right sides for sealing the left and right ends of the two semicircular covers (41) are fixedly installed on the side of the sliding frames (49) close to each other. The bracket (3) is threadedly connected with two No. 2 screw rods (492) arranged symmetrically up and down, and the No. 2 screw rods (492) are rotatably connected to the sealing plates (491) at corresponding positions.

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