A plastic pipe sizing and cooling device and method

Abstract

The application provides a plastic pipe sizing and cooling device and method, and belongs to the technical field of plastic pipe production. The device comprises a fixed outer cylinder, a sizing pipeline, an annular adjusting plate and a driving assembly. The sizing pipeline is fixedly arranged inside the fixed outer cylinder and is distributed along the axial direction of the fixed outer cylinder. An annular negative pressure chamber is formed between the fixed outer cylinder and the sizing pipeline. The annular adjusting plate is movably arranged inside the annular negative pressure chamber. The inner wall of the annular adjusting plate is attached to the outer wall of the sizing pipeline. The outer wall of the annular adjusting plate is attached to the inner wall of the fixed outer cylinder. The annular adjusting plate is driven by the driving assembly to move along the annular negative pressure chamber and synchronously with the plastic pipe, so that the negative pressure space gradually increases, thereby realizing continuous sizing of the end of the plastic pipe and ensuring that the end of the plastic pipe can obtain a longer sizing effect after extrusion, thereby improving the sizing quality of the plastic pipe.

Description

Technical Field

[0001] This invention belongs to the field of plastic pipe manufacturing technology, specifically relating to a plastic pipe sizing and cooling device and method. Background Technology

[0002] Currently, the production of plastic pipes requires the use of an extruder to extrude the hot molten raw materials that have been mixed, sheared, and plasticized from the outlet of the extruder. When the plastic pipes are extruded, they have a relatively high temperature and do not have enough strength and rigidity to withstand their own weight and deformation. Therefore, a sizing device is needed to sizing the plastic pipes to ensure that they have good surface roughness, accurate dimensions, and geometry.

[0003] Most existing sizing devices include a sizing pipe and a vacuum device. The inner wall of the sizing pipe has several air grooves along its length. Plastic tubing extruded from an extruder enters the sizing pipe. The vacuum device evacuates all the air grooves within the sizing pipe, causing the plastic tubing to adhere to the inner wall of the sizing pipe under negative pressure, thus completing the sizing. However, when the end of the plastic tubing just enters the sizing pipe, not all the air grooves are acting on the outside of the tubing. If the vacuum device is activated at this point, the air grooves not acting on the outside of the tubing will disrupt the overall negative pressure environment, resulting in insufficient negative pressure and affecting the sizing quality at the end of the plastic tubing. Therefore, the vacuum device should only be activated after all the air grooves are acting on the outside of the plastic tubing to ensure the negative pressure effect in all the air grooves. However, even after all the air grooves are acting on the outside of the plastic tubing, the end of the plastic tubing quickly moves out of the sizing pipe as the tubing moves. Thus, the end of the plastic tubing also cannot achieve a long sizing period, resulting in poor sizing quality at the end of the plastic tubing. Summary of the Invention

[0004] In view of the shortcomings of the prior art, the technical problem to be solved by the embodiments of the present invention is to provide a plastic pipe sizing and cooling device.

[0005] To solve the above-mentioned technical problems, the present invention provides the following technical solution:

[0006] A plastic pipe sizing and cooling device includes a fixed outer cylinder, a sizing pipe, an annular adjusting plate, and a drive assembly.

[0007] The sizing pipe is fixedly installed inside the fixed outer cylinder and distributed along the axis of the fixed outer cylinder, and an annular negative pressure chamber is formed between the fixed outer cylinder and the sizing pipe;

[0008] The annular adjusting plate is movably disposed inside the annular negative pressure chamber. The inner annular wall of the annular adjusting plate is in contact with the outer wall of the sizing pipe, and the outer annular wall of the annular adjusting plate is in contact with the inner wall of the fixed outer cylinder.

[0009] The inner wall of the sizing pipe is provided with several annular air grooves along the axial direction. Each set of annular air grooves is provided with several air holes, and the air holes communicate with the annular negative pressure chamber.

[0010] The drive assembly is used to drive the annular adjustment plate to move synchronously with the plastic pipe along the interior of the annular negative pressure chamber.

[0011] As a further improvement of the present invention: the drive assembly includes a pull rod, a first lug plate, a ring plate, a second lug plate, and a power component.

[0012] The ring plate is disposed on the left side of the fixed outer cylinder. The first ear plate and the second ear plate are fixedly disposed on the annular outer wall of the ring plate. One end of the pull rod is fixedly connected to the first ear plate, and the other end extends from one end of the fixed outer cylinder to the interior of the annular negative pressure chamber and is fixedly connected to the annular adjusting plate. The output end of the power component is connected to the second ear plate.

[0013] As a further improvement of the present invention: a suction pipe is fixedly provided at the right end of the side wall of the fixed outer cylinder, one end of the suction pipe is connected to the annular negative pressure chamber, and the other end is connected to the vacuum pump.

[0014] As a further improvement of the present invention: the inner wall of the sizing pipe is provided with a plurality of annular water grooves along the axial direction, the annular water grooves and the annular air grooves are alternately distributed, and the plurality of annular water grooves are provided with water inlet pipes and water outlet pipes. The water inlet pipes are used to supply cooling water into the plurality of annular water grooves, and the water outlet pipes are used to discharge the cooling water in the plurality of annular water grooves.

[0015] As a further improvement to the present invention: each of the annular water tanks is provided with a first water inlet hole.

[0016] The water inlet fitting includes an inner water inlet pipe and an outer water inlet pipe.

[0017] The inner inlet pipe is fixedly installed on the outer wall of the sizing pipe and distributed along the length of the sizing pipe. Several second inlet holes corresponding to and communicating with the first inlet hole are opened on the side wall of the inner inlet pipe. The outer inlet pipe is fixedly installed at the end of the fixed outer cylinder and communicates with the inner inlet pipe.

[0018] As a further improvement to the present invention: each of the annular water tanks is provided with a set of first drainage holes.

[0019] The drainage pipe fitting includes an inner drainage pipe and an outer drainage pipe.

[0020] The inner drainage pipe is fixedly installed on the outer wall of the sizing pipe and distributed along the length of the sizing pipe. Several second drainage holes corresponding to and communicating with the first drainage hole are opened on the side wall of the inner drainage pipe. The outer drainage pipe is fixedly installed at the end of the fixed outer cylinder and communicates with the inner drainage pipe.

[0021] As a further improvement of the present invention: the annular regulating plate has a first slot through which the water inlet pipe can pass and a second slot through which the drain pipe can pass on its annular inner wall.

[0022] As a further improvement of the present invention: a plurality of air holes located on the same group of annular air grooves are densely distributed in annular intervals on the sizing pipe.

[0023] As a further improvement of the present invention: a third slot is provided on the water inlet inner pipe at each location of the air hole, and a fourth slot is provided on the drain inner pipe at each location of the air hole.

[0024] As a further improvement of the present invention: a water-blocking rod is also fixedly provided on one side of the first ear plate, and the end of the water-blocking rod away from the first ear plate passes through the end of the fixed outer cylinder and extends into the interior of the water inlet inner pipe.

[0025] The present invention also provides a method for using the above-described plastic pipe sizing and cooling device, comprising the following steps:

[0026] S1. Initially, the annular adjustment plate is located at the right end of the annular negative pressure chamber, between the first annular air groove and the second annular air groove. After the plastic pipe is extruded, the end of the plastic pipe enters the sizing pipe from the right end of the sizing pipe.

[0027] S2. When the end of the plastic pipe enters the sizing pipe, the vacuum pump is started. The vacuum pump performs vacuum treatment on the annular negative pressure chamber on the right side of the annular adjustment plate, so that the annular negative pressure chamber on the right side of the annular adjustment plate forms a negative pressure. This negative pressure is transmitted to the inside of the first annular air groove through several air holes on the first annular air groove, thereby adsorbing the end of the plastic pipe onto the inner wall of the sizing pipe.

[0028] S3. Simultaneously start the drive assembly. The drive assembly drives the annular adjustment plate to move to the left along the inside of the annular negative pressure chamber, following the plastic pipe. When the annular adjustment plate moves to the left between the second and third annular air grooves, the negative pressure in the annular negative pressure chamber on the right side of the annular adjustment plate is transmitted to the inside of the second annular air groove through several air holes on the second annular air groove, thereby continuing to adsorb the plastic pipe onto the inner wall of the sizing pipe. This process is repeated until the annular adjustment plate moves to the left end of the annular negative pressure chamber, and the end of the plastic pipe passes out from the inside of the sizing pipe.

[0029] Compared with the prior art, the beneficial effects of the present invention are as follows: by driving the annular adjusting plate along the inside of the annular negative pressure chamber to move synchronously with the plastic pipe, the negative pressure space gradually increases synchronously with the extrusion length of the plastic pipe, thereby achieving continuous sizing of the end of the plastic pipe, thus ensuring that the end of the plastic pipe can obtain a longer sizing effect after extrusion, improving the sizing quality of the plastic pipe. Compared with the prior art, it can realize the movement of the negative pressure space along the inside of the sizing pipe according to the end of the plastic pipe, and automatically adaptively adjust the negative pressure space required for the sizing of the plastic pipe, thereby ensuring the sizing quality of the end position of the plastic pipe. Attached Figure Description

[0030] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0031] Figure 1 This is a schematic diagram of the structure of the plastic pipe sizing and cooling device in an embodiment of the present invention. Figure 1 ;

[0032] Figure 2 This is a schematic diagram of the structure of the plastic pipe sizing and cooling device in an embodiment of the present invention. Figure 2 ;

[0033] Figure 3 This is a schematic diagram of the structure of the annular adjusting plate in an embodiment of the present invention;

[0034] Figure 4 for Figure 1 Enlarged view of region A in the middle;

[0035] Figure 5 for Figure 1 Enlarged view of region B in the middle;

[0036] Figure 6 for Figure 1 Enlarged diagram of region C in the middle;

[0037] Figure 7 for Figure 1 Enlarged schematic diagram of region D in the middle;

[0038] In the diagram: 10-base, 20-fixed outer cylinder, 201-exhaust pipe, 30-sizing pipe, 301-air hole, 302-annular air groove, 303-annular water groove, 304-first water inlet, 305-first drain hole, 40-annular negative pressure chamber, 50-annular adjusting plate, 501-first slot, 502-second slot, 60-water inlet fitting, 601-inner water inlet pipe, 602-second water inlet, 603-third slot, 604-outer water inlet pipe, 70-drive assembly, 701-pull rod, 702-first ear plate, 703-water blocking rod, 704-ring plate, 705-second ear plate, 706-power component, 80-drainage fitting, 801-inner drain pipe, 802-second drain hole, 803-fourth slot, 804-outer drain pipe, 90-plastic pipe. Detailed Implementation

[0039] The technical solution of the present invention will be further described in detail below with reference to specific embodiments.

[0040] Embodiments of the present invention are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.

[0041] In the description of this invention, it should be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0042] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "setting" should be interpreted broadly. For example, they can refer to a fixed connection or setting, a detachable connection or setting, or an integral connection or setting. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0043] Please see Figure 1 , Figure 2 , Figure 4 as well as Figure 5This embodiment provides a plastic pipe sizing and cooling device, including a base 10, a fixed outer cylinder 20, a sizing pipe 30, an annular adjusting plate 50, and a drive assembly 70. The fixed outer cylinder 20 is fixedly installed on the upper part of the base 10. The sizing pipe 30 is fixedly disposed inside the fixed outer cylinder 20 and distributed along the axial direction of the fixed outer cylinder 20. An annular negative pressure chamber 40 is formed between the fixed outer cylinder 20 and the sizing pipe 30. The annular adjusting plate 50 is movably disposed inside the annular negative pressure chamber 40, and the annular inner wall of the annular adjusting plate 50 is in contact with the outer wall of the sizing pipe 30. The annular outer wall of the annular adjusting plate 50 is in contact with the inner wall of the fixed outer cylinder 20. The inner wall of the sizing pipe 30 is provided with a plurality of annular air grooves 302 along the axial direction. Each set of annular air grooves 302 is provided with a plurality of air holes 301. The plurality of air holes 301 are connected to the annular negative pressure chamber 40. A vacuum pump (not shown in the figure) is also provided on the base 10. The vacuum pump is used to evacuate the inside of the annular negative pressure chamber 40. The driving component 70 is installed on the base 10 and is used to drive the annular adjusting plate 50 to move synchronously with the plastic pipe 90 along the inside of the annular negative pressure chamber 40.

[0044] For ease of understanding, the annular air grooves 302 are named sequentially from right to left as the first annular air groove, the second annular air groove, the third annular air groove, and so on. Initially, the annular adjusting plate 50 is located at the right end of the annular negative pressure chamber 40, between the first and second annular air grooves. After the plastic pipe 90 is extruded by an extruder (not shown in the figure), the end of the plastic pipe 90 enters the sizing pipe 30 from the right end. At this time, the vacuum pump is started, and the vacuum pump performs vacuum treatment on the annular negative pressure chamber 40 to the right of the annular adjusting plate 50, so that the annular negative pressure chamber 40 to the right of the annular adjusting plate 50 forms a negative pressure. This negative pressure is transmitted to the inside of the first annular air groove through the several air holes 301 on the first annular air groove, thereby adsorbing the end of the plastic pipe 90 onto the inner wall of the sizing pipe 30. At the same time, the drive assembly 70 is started, and the drive assembly 70 drives the annular adjusting plate 50 to follow the plastic pipe. The plastic pipe 90 moves synchronously to the left along the inside of the annular negative pressure chamber 40. When the annular adjusting plate 50 moves to the left between the second and third annular air grooves, the negative pressure in the annular negative pressure chamber 40 on the right side of the annular adjusting plate 50 is transmitted to the inside of the second annular air groove through several air holes 301 on the second annular air groove, thereby continuing to adsorb the plastic pipe 90 onto the inner wall of the sizing pipe 30. This process is repeated until the annular adjusting plate 50 moves to the left end of the annular negative pressure chamber 40, and the end of the plastic pipe 90 passes through the inside of the sizing pipe 30. During the above process, the driving component 70 drives the annular adjusting plate 50 to move synchronously with the plastic pipe 90 along the inside of the annular negative pressure chamber 40, thereby gradually increasing the negative pressure space on the right side of the annular adjusting plate 50, thereby achieving continuous sizing of the end of the plastic pipe 90, thus ensuring that the end of the plastic pipe 90 can obtain a longer sizing effect after extrusion, and improving the sizing quality of the plastic pipe 90.

[0045] Please see Figure 1 In this embodiment, the drive assembly 70 includes a pull rod 701, a first ear plate 702, an annular plate 704, a second ear plate 705, and a power component 706. The annular plate 704 is disposed on the left side of the fixed outer cylinder 20. The first ear plate 702 and the second ear plate 705 are fixedly disposed on the annular outer wall of the annular plate 704. One end of the pull rod 701 is fixedly connected to the first ear plate 702, and the other end extends from one end of the fixed outer cylinder 20 into the annular negative pressure chamber 40 and is fixedly connected to the annular adjusting plate 50. The power component 706 is mounted on the upper part of the base 10, and the output end of the power component 706 is connected to the second ear plate 705. Of course, the drive assembly can also be implemented using other structures, all of which should fall within the protection scope of this invention.

[0046] After the end of the plastic pipe 90 enters the sizing pipe 30, the vacuum pump and power component 706 are simultaneously activated. The vacuum pump evacuates the annular negative pressure chamber 40 on the right side of the annular adjusting plate 50. The power component 706 drives the second ear plate 705, the ring plate 704, the first ear plate 702, and the pull rod 701 to move to the left. When the pull rod 701 moves to the left, it causes the annular adjusting plate 50 to move to the left along the interior of the annular negative pressure chamber 40, so that the space of the annular negative pressure chamber 40 on the right side of the annular adjusting plate 50 moves along the sizing pipe 30 with the end of the plastic pipe 90. The increased mobility of the sizing pipe 30 allows several annular air grooves 302 to be gradually exposed to the negative pressure environment, thereby continuously adsorbing the end of the plastic pipe 90 onto the inner wall of the sizing pipe 30, thus improving the sizing effect of the end of the plastic pipe 90. When the annular adjusting plate 50 moves to the left end of the annular negative pressure chamber 40, the annular adjusting plate 50 stops moving, and the end of the plastic pipe 90 passes through the left end of the sizing pipe 30. As the plastic pipe 90 continues to move, it continues to pass through the inside of the annular plate 704.

[0047] The power component 706 can be a hydraulic telescopic rod, a pneumatic push rod, or a linear motor, etc., all of which should fall within the protection scope of this invention.

[0048] Please see Figure 1 as well as Figure 2 In this embodiment, an air extraction pipe 201 is fixedly installed at the right end of the side wall of the fixed outer cylinder 20. One end of the air extraction pipe 201 is connected to the annular negative pressure chamber 40, and the other end is connected to the vacuum pump.

[0049] When the vacuum pump is started, the vacuum pump can be used to evacuate the annular negative pressure chamber 40 located on the right side of the annular regulating plate 50 through the suction pipe 201, so that the annular negative pressure chamber 40 on the right side of the annular regulating plate 50 forms a negative pressure condition. This negative pressure condition is transmitted to the annular air groove 302 through the air hole 301, thereby adsorbing the plastic pipe 90 onto the inner wall of the sizing pipe 30, thus completing the sizing process of the plastic pipe 90.

[0050] Please see Figure 1 , Figure 4 as well as Figure 5 In this embodiment, the inner wall of the sizing pipe 30 is provided with a plurality of annular water grooves 303 along the axial direction. The plurality of annular water grooves 303 and the plurality of annular air grooves 302 are alternately distributed. The plastic pipe sizing cooling device also includes a water inlet pipe 60 and a drain pipe 80. The water inlet pipe 60 is used to supply cooling water into the plurality of annular water grooves 303, and the drain pipe 80 is used to discharge the cooling water in the plurality of annular water grooves 303.

[0051] During the sizing process, as the plastic pipe 90 moves along the inside of the sizing pipe 30, cooling water is supplied to the inside of several annular water tanks 303 through the water inlet fitting 60, and the cooling water inside the several annular water tanks 303 is discharged through the drain fitting 80. This allows the cooling water to flow along the inside of the annular water tanks 303, and the flowing cooling water acts on the outer wall of the plastic pipe 90, thereby cooling and solidifying the plastic pipe 90 and achieving better sizing of the plastic pipe 90.

[0052] Please see Figure 2 as well as Figure 4 In this embodiment, each annular water tank 303 is provided with a set of first water inlet holes 304. The water inlet pipe 60 includes an inner water inlet pipe 601 and an outer water inlet pipe 604. The inner water inlet pipe 601 is fixedly installed on the outer wall of the sizing pipe 30 and distributed along the length of the sizing pipe 30. A plurality of second water inlet holes 602 corresponding to and communicating with the first water inlet holes 304 are opened on the side wall of the inner water inlet pipe 601. The outer water inlet pipe 604 is fixedly installed at the end of the fixed outer cylinder 20 and communicates with the inner water inlet pipe 601.

[0053] As the plastic pipe 90 moves inside the sizing pipe 30, a water pump (not shown in the figure) pumps cooling water through the outer inlet pipe 604 to the inner inlet pipe 601, and then through several second inlet holes 602 and several first inlet holes 304 into several annular water tanks 303, thereby acting on the outer wall of the plastic pipe 90 to achieve cooling treatment of the plastic pipe 90.

[0054] Please see Figure 2 , Figure 5 and Figure 7 In this embodiment, each annular water tank 303 is provided with a set of first drainage holes 305. The drainage pipe fitting 80 includes an inner drainage pipe 801 and an outer drainage pipe 804. The inner drainage pipe 801 is fixedly installed on the outer wall of the sizing pipe 30 and distributed along the length of the sizing pipe 30. A plurality of second drainage holes 802 corresponding to and communicating with the first drainage holes 305 are opened on the side wall of the inner drainage pipe 801. The outer drainage pipe 804 is fixedly installed at the end of the fixed outer cylinder 20 and communicates with the inner drainage pipe 801.

[0055] After the cooling water enters the interior of several annular water tanks 303, it can enter the interior of the inner drain pipe 801 through several first drain holes 305 and several second drain holes 802, and then be discharged to the outside through the outer drain pipe 804, thereby carrying away the heat of the plastic pipe 90 to ensure the cooling effect of the plastic pipe 90.

[0056] Please see Figure 3In this embodiment, the annular adjusting plate 50 has a first slot 501 through which the water inlet pipe 601 can pass and a second slot 502 through which the drain pipe 801 can pass on its annular inner wall.

[0057] When the annular adjusting plate 50 moves along the inside of the annular negative pressure chamber 40, the first slot 501 slides against the outer wall of the water inlet pipe 601, and the second slot 502 slides against the outer wall of the drain pipe 801.

[0058] When the vacuum pump evacuates the annular negative pressure chamber 40, in order to ensure that different positions of the plastic pipe 90 are subjected to a uniform outward negative pressure effect, thereby improving the sizing effect of the plastic pipe 90, in this embodiment, a number of air holes 301 located on the same group of annular air grooves 302 are densely distributed in an annular pattern at equal intervals on the sizing pipe 30. In this way, the negative pressure in the annular negative pressure chamber 40 can be uniformly transmitted to the annular air grooves 302 through the number of air holes 301, thereby adsorbing different positions of the plastic pipe 90 onto the inner wall of the sizing pipe 30, so as to ensure the sizing effect of the plastic pipe 90.

[0059] Because the numerous air holes 301 on the same set of annular air grooves 302 are densely distributed in an annular pattern at equal intervals on the sizing pipe 30, and the inlet pipe 601 and outlet pipe 801 are installed on the outer wall of the sizing pipe 30, the presence of the inlet pipe 601 and outlet pipe 801 can easily obstruct the dense arrangement of the numerous air holes 301. To avoid this phenomenon, please refer to... Figure 4 to Figure 6 In this embodiment, a third slot 603 is provided on the water inlet inner pipe 601 at each location of the air hole 301, and a fourth slot 803 is provided on the drain inner pipe 801 at each location of the air hole 301. In this way, by setting the third slot 603 and the fourth slot 803, a number of air holes 301 can be arranged in an equally spaced and dense manner on the sizing pipe 30.

[0060] As the end of the plastic pipe 90 moves along the inside of the sizing pipe 30, the cooling water pumped into the inlet pipe 601 flows through the entire inner cavity of the inlet pipe 601. At this time, the annular water groove 303 located in front of the end of the plastic pipe 90 is not yet occupied by the plastic pipe 90. Therefore, the cooling water enters the annular water groove 303 ahead of the end through the corresponding second inlet hole 602 and the first inlet hole 304, and then enters the inner cavity of the sizing pipe 30 ahead of the end. During the subsequent movement of the plastic pipe 90, the cooling water entering the inner cavity of the sizing pipe 30 will also flow into the plastic pipe 90, resulting in cooling water residue inside the plastic pipe 90. To avoid this phenomenon, please refer to... Figure 1 as well as Figure 4In this embodiment, a water-blocking rod 703 is also fixedly provided on one side of the first ear plate 702. The end of the water-blocking rod 703 away from the first ear plate 702 passes through the end of the fixed outer cylinder 20 and extends into the interior of the water inlet inner pipe 601.

[0061] Initially, the water-blocking rod 703 is located inside the inlet pipe 601 and is tightly attached to the inner wall of the inlet pipe 601. The water-blocking rod 703 blocks several second inlet holes 602. When the power component 706 moves the second ear plate 705, the ring plate 704, the first ear plate 702, and the pull rod 701, thereby pulling the annular adjusting plate 50 to move to the left along the annular negative pressure chamber 40, the first ear plate 702 drives the water-blocking rod 703 to move to the left along the inlet pipe 601 simultaneously. When the water-blocking rod 703 moves to the left, the several second inlet holes 602 that it has blocked can be released one by one, which, together with the water pump, cools the water pump. The cooling water is delivered to the inside of the inner water inlet pipe 601, located in the area to the right of the water-blocking rod 703. The cooling water enters the annular water tank 303 occupied by the plastic pipe 90 through the leaking second water inlet hole 602 to cool the plastic pipe 90. The annular water tank 303 located in front of the plastic pipe 90, which is not currently occupied by the plastic pipe 90, cannot be filled with cooling water due to the blocking effect of the water-blocking rod 703 on the corresponding second water inlet hole 602. Therefore, there is no situation where the cooling water enters the inner cavity of the sizing pipe 30 in advance or enters the plastic pipe 90 through the inner cavity of the sizing pipe 30.

[0062] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from its spirit or essential characteristics. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the present invention, and no reference numerals in the claims should be construed as limiting the scope of the claims.

[0063] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity, and those skilled in the art should consider the specification as a whole.

Claims

1. A plastic pipe sizing and cooling device, comprising a sizing pipe (30), wherein the inner wall of the sizing pipe (30) is provided with a plurality of annular air grooves (302) along the axial direction, and each set of the annular air grooves (302) is provided with a plurality of air holes (301); characterized in that, Also includes: A fixed outer cylinder (20) is provided, and the sizing pipe (30) is fixedly disposed inside the fixed outer cylinder (20) and distributed along the axial direction of the fixed outer cylinder (20). An annular negative pressure chamber (40) is formed between the fixed outer cylinder (20) and the sizing pipe (30), and a plurality of air holes (301) are connected to the annular negative pressure chamber (40). An annular adjusting plate (50) is movably disposed inside the annular negative pressure chamber (40). The annular inner wall of the annular adjusting plate (50) is in contact with the outer wall of the sizing pipe (30), and the annular outer wall of the annular adjusting plate (50) is in contact with the inner wall of the fixed outer cylinder (20). A drive assembly (70) is used to drive the annular adjustment plate (50) to move synchronously with the plastic pipe (90) along the inside of the annular negative pressure chamber (40); The drive assembly (70) includes a pull rod (701), a first lug plate (702), a ring plate (704), a second lug plate (705), and a power component (706); The ring plate (704) is disposed on the left side of the fixed outer cylinder (20). The first ear plate (702) and the second ear plate (705) are fixedly disposed on the annular outer wall of the ring plate (704). One end of the pull rod (701) is fixedly connected to the first ear plate (702), and the other end extends from one end of the fixed outer cylinder (20) into the annular negative pressure chamber (40) and is fixedly connected to the annular adjusting plate (50). The output end of the power component (706) is connected to the second ear plate (705).

2. The plastic pipe sizing and cooling device according to claim 1, characterized in that, The inner wall of the sizing pipe (30) is also provided with several annular water grooves (303) along the axial direction. The annular water grooves (303) and the annular air grooves (302) are alternately distributed. The several annular water grooves (303) are equipped with water inlet fittings (60) and drainage fittings (80).

3. The plastic pipe sizing and cooling device according to claim 2, characterized in that, Each of the annular water tanks (303) is provided with a first water inlet (304). The water inlet fitting (60) includes an inner water inlet pipe (601) and an outer water inlet pipe (604). The inner inlet pipe (601) is fixedly installed on the outer wall of the sizing pipe (30) and distributed along the length of the sizing pipe (30). The inner inlet pipe (601) has several second inlet holes (602) that are corresponding to and communicate with the first inlet hole (304) on its side wall. The outer inlet pipe (604) is fixedly installed at the end of the fixed outer cylinder (20) and communicates with the inner inlet pipe (601).

4. The plastic pipe sizing and cooling device according to claim 3, characterized in that, Each of the annular water tanks (303) is provided with a first drain hole (305). The drainage pipe fitting (80) includes an inner drainage pipe (801) and an outer drainage pipe (804). The inner drain pipe (801) is fixedly installed on the outer wall of the sizing pipe (30) and distributed along the length of the sizing pipe (30). The inner drain pipe (801) has several second drain holes (802) that are corresponding to and communicate with the first drain hole (305) on its side wall. The outer drain pipe (804) is fixedly installed at the end of the fixed outer cylinder (20) and communicates with the inner drain pipe (801).

5. A plastic pipe sizing and cooling device according to claim 4, characterized in that, The annular regulating plate (50) has a first slot (501) through which the water inlet pipe (601) can pass and a second slot (502) through which the drain pipe (801) can pass.

6. The plastic pipe sizing and cooling device according to claim 4, characterized in that, A number of air holes (301) located on the same group of annular air grooves (302) are densely distributed in annular intervals on the sizing pipe (30).

7. A plastic pipe sizing and cooling device according to claim 6, characterized in that, The water inlet pipe (601) is provided with a third slot (603) at each location of the air hole (301), and the drain pipe (801) is provided with a fourth slot (803) at each location of the air hole (301).

8. A plastic pipe sizing and cooling device according to claim 3, characterized in that, A water-blocking rod (703) is also fixedly installed on one side of the first ear plate (702). The end of the water-blocking rod (703) away from the first ear plate (702) passes through the end of the fixed outer cylinder (20) and extends into the interior of the water inlet inner pipe (601).

9. The method using the plastic pipe sizing and cooling device according to claim 1, characterized in that, Includes the following steps: S1. Initially, the annular adjustment plate (50) is located at the right end of the annular negative pressure chamber (40) between the first annular air groove and the second annular air groove. After the plastic pipe (90) is extruded, the end of the plastic pipe (90) enters the inside of the sizing pipe (30) from the right end of the sizing pipe (30). S2. When the end of the plastic pipe (90) enters the sizing pipe (30), the vacuum pump is started. The vacuum pump performs vacuum treatment on the annular negative pressure chamber (40) on the right side of the annular adjustment plate (50), so that the annular negative pressure chamber (40) on the right side of the annular adjustment plate (50) forms a negative pressure. This negative pressure is transmitted to the inside of the first annular air groove through several air holes (301) on the first annular air groove, thereby adsorbing the end of the plastic pipe (90) onto the inner wall of the sizing pipe (30). S3. Simultaneously start the drive assembly (70). The drive assembly (70) drives the annular adjustment plate (50) to move to the left along the annular negative pressure chamber (40) in sync with the plastic pipe (90). When the annular adjustment plate (50) moves to the left between the second annular air groove and the third annular air groove, the negative pressure in the annular negative pressure chamber (40) on the right side of the annular adjustment plate (50) is transmitted to the inside of the second annular air groove through several air holes (301) on the second annular air groove, thereby continuing to adsorb the plastic pipe (90) onto the inner wall of the sizing pipe (30). This process is repeated until the annular adjustment plate (50) moves to the left end of the annular negative pressure chamber (40), and the end of the plastic pipe (90) passes through the inside of the sizing pipe (30).

Images