Internal and external cooling device used after pipe extrusion molding

Abstract

The utility model belongs to the technical field of pipeline production, and particularly relates to an internal and external cooling device after pipe extrusion molding, which comprises an internal cooling system and an external cooling system. The inner cooling system is arranged in the pipe extrusion die and cools the pipe by accelerating air flow in the pipe. The outer cooling system is coaxial with the pipe extrusion die and comprises a first-stage quick cooling box and a second-stage cooling box. The first-stage rapid cooling box adopts a full-alloy sealed box body, a pipe inlet I and a pipe outlet I are formed in the front end and the rear end, a pipeline supporting unit I and a first-stage spraying unit are arranged in the first-stage rapid cooling box, and a first drainage unit is arranged at the bottom. The second-stage cooling box adopts a sealed box body, a pipe inlet II and a pipe outlet II are formed in the front end and the rear end, a pipeline supporting unit II and a second-stage spraying unit are arranged in the second-stage cooling box, and a second drainage unit is arranged at the bottom of the second-stage cooling box. And within the same axial distance, the water spraying amount of the first-stage spraying unit is larger than that of the second-stage spraying unit, so that efficient cooling is achieved. The technical scheme has the advantages in the aspects of uniformity, efficiency, internal stress control and energy consumption, the quality is improved, the speed is increased, and enterprise development is facilitated.

Description

Technical Field

[0001] The utility model belongs to the technical field of pipeline production, and in particular relates to an internal and external cooling device for a pipe after extrusion molding. Background Art

[0002] In recent years, the scale of industry has continued to expand, and the demand for pipes in various industries has exploded, placing higher demands on pipe quality and production efficiency. Pipe extrusion is a continuous thermal process. The extruded pipe is very hot and in a viscous or highly elastic state, so it needs to be cooled and formed.

[0003] Traditional cooling methods often have limitations, specifically:

[0004] First, uneven cooling is a major issue. Improper layout and design of some cooling systems can lead to differences in cooling rates between the circumferential and axial directions of the pipe. This can cause the pipe to become curved, oval, or otherwise deformed, severely affecting its appearance and dimensional accuracy, hindering subsequent installation and operation.

[0005] Secondly, the cooling efficiency is low. Some traditional cooling technologies rely on natural air cooling or simple water cooling, which has a slow cooling speed and greatly limits the production speed of pipe extrusion. This not only reduces production efficiency but also increases production costs.

[0006] Furthermore, existing cooling technologies do not adequately control internal stresses in pipes. Improper cooling rates and temperature gradients can easily generate significant internal stresses within the pipe, potentially causing it to crack during use, reducing its overall quality and service life. This problem is particularly acute in applications subject to high pressure or complex environments.

[0007] In addition, some cooling technologies have high energy consumption, which is not conducive to the sustainable development and cost control of enterprises in today's increasingly tight energy situation. Summary of the Invention

[0008] In order to overcome the shortcomings of the existing technology, an internal and external cooling device for pipes after extrusion molding is proposed to ensure that the pipes can be cooled quickly and evenly after extrusion molding, thereby improving the quality of the pipes and production efficiency, and meeting the demand for high-quality pipes in multiple fields such as construction, chemical industry, and energy.

[0009] A device for internal and external cooling of pipes after extrusion molding, comprising an internal cooling system and an external cooling system; the internal cooling system is arranged in the pipe extrusion die and is used to cool the pipe body by accelerating the air flow inside the pipe body; the external cooling system is arranged coaxially with the pipe extrusion die and comprises a first-stage rapid cooling box and a second-stage cooling box arranged in sequence along the extension line of the axis of the pipe extrusion die.

[0010] The first-stage rapid cooling box includes an all-alloy sealed box body, and an inlet I and an outlet I are respectively provided at the front and rear ends of the all-alloy sealed box body, and the inlet I and the outlet I are the pipe rapid cooling channel; the interior of the first-stage rapid cooling box is provided with a pipeline support unit I and a first-stage spray unit based on the pipe rapid cooling channel; the bottom of the first-stage rapid cooling box is provided with a first drainage unit.

[0011] The secondary cooling box includes a sealed encapsulated box body, with the front and rear ends of the sealed encapsulated box body respectively having an inlet II and an outlet II, and a pipe cooling channel between the inlet II and the outlet II; inside the secondary cooling box, a pipe support unit II and a secondary spray unit are arranged based on the pipe cooling channel; a second drainage unit is arranged at the bottom of the secondary cooling box.

[0012] Within the same axial distance, the water spraying volume of the first-stage spray unit is greater than that of the second-stage spray unit.

[0013] Preferably, the internal cooling system includes a diverter plate and an air channel disposed within the pipe extrusion die. The air inlet of the air channel is axially located at the center of the discharge end of the pipe extrusion die; the air outlet of the air channel is radially located on the side of the pipe extrusion die for connection to an external air extraction device. The diverter plate is coaxially disposed at the discharge end of the pipe extrusion die and is fixedly connected to the pipe extrusion die.

[0014] Preferably, elastic rubber rings are provided at the pipe inlet I, pipe outlet I, pipe inlet II and pipe outlet II respectively.

[0015] Preferably, the first drainage unit includes P spray pipes arranged at intervals along the circumference of the pipe rapid cooling channel, and the second drainage unit includes Q spray pipes arranged at intervals along the circumference of the pipe cooling channel; wherein P>Q, and nozzles are arranged at intervals on all spray pipes.

[0016] Preferably, the first drainage unit and the second drainage unit further include an annular mounting frame respectively; the annular mounting frame is provided with pipe holes spaced circumferentially according to the number of spray pipes.

[0017] Preferably, the pipeline support unit I includes a plurality of support seats I arranged at intervals along the axial direction of the pipe rapid cooling channel; the support seat I includes a fixing frame and a semicircular smooth plate I; the semicircular smooth plate I is fixedly connected to the all-alloy sealing box through the fixing frame.

[0018] Preferably, the pipeline support unit II includes a plurality of support seats II spaced apart along the axial direction of the pipe cooling channel, and the support seat II includes a support plate, a semicircular notch is provided on the top of the support plate, and a semicircular smooth plate II is installed along the semicircular notch.

[0019] Preferably, the pipeline support unit II further includes a plurality of driven support assemblies arranged at intervals along the axial direction of the pipe cooling channel; the driven support assembly includes a driven wheel and a wheel body bracket, and the driven wheel is mounted on the wheel body bracket.

[0020] Preferably, transparent glass plates are spliced ​​and embedded on the left and right sides of the packaging and sealing box.

[0021] Preferably, a plurality of sealing scrapers are arranged inside the packaging sealing box at intervals along the axial direction, circular tube perforations are opened on the sealing scrapers, and wiper rubber rings are arranged along the circular tube perforations.

[0022] Compared with the existing technology, the advantages of this technical solution are:

[0023] 1. Cooling uniformity

[0024] 1) A combination of internal and external cooling systems is employed. The internal cooling system accelerates air flow within the pipe to remove heat, while the external cooling system's primary and secondary cooling boxes sequentially cool the pipe. This multi-faceted cooling approach ensures adequate cooling of all circumferential and axial locations, preventing bending, ovalization, and other dimensional issues caused by uneven cooling. This ensures the pipe's appearance and dimensional accuracy, facilitating subsequent installation and use.

[0025] 2) Both the primary and secondary cooling boxes are equipped with pipe support units to ensure the stable position of the pipe body in the cooling channel, further promoting cooling uniformity. For example, the driven support assembly in pipe support unit II not only provides support but also reduces the resistance to axial movement of the pipe body caused by contact friction, ensuring smoother movement of the pipe body during cooling, thereby improving cooling uniformity.

[0026] 2. Cooling efficiency

[0027] 1) The first-stage rapid cooling box utilizes a sealed, all-alloy enclosure. The internal first-stage spray unit delivers a relatively high water volume, rapidly reducing the temperature of the tube and securing its shape. The second-stage cooling box removes excess heat from the tube, ensuring adequate cooling. This tiered cooling approach allows for precise cooling tailored to the needs of each stage, significantly improving cooling efficiency and avoiding the slow cooling speeds associated with traditional cooling technologies. This increases tube extrusion production speed and reduces production costs.

[0028] 2) Within the same axial distance, the water spray volume of the first-stage spray unit is greater than that of the second-stage spray unit. This design can make the first-stage rapid cooling box have better heat exchange performance, can quickly cool down, and further improve the cooling efficiency of the entire cooling device.

[0029] 3. Internal stress control

[0030] Reasonable cooling rates and temperature gradients help reduce internal stress within the pipe. The combination of internal and external cooling systems and a graded cooling approach ensures a more stable temperature change during the cooling process, avoiding the significant internal stresses that can arise from inappropriate cooling rates and temperature gradients. This improves the overall quality and service life of the pipe, making it more reliable in applications involving high pressure or complex environments.

[0031] 4. Energy consumption

[0032] This solution uses a more efficient cooling method, capable of cooling the pipe body in a shorter time, reducing the time and energy required for the cooling process. Compared with some traditional cooling technologies with higher energy consumption, it is more conducive to the company's sustainable development and cost control.

[0033] V. Other aspects

[0034] 1) Elastic rubber rings are installed at the pipe inlet I, pipe outlet I, pipe inlet II and pipe outlet II to scrape off water on the surface of the pipe body, preventing water from flowing onto the workshop floor, keeping the workshop environment clean and tidy, and avoiding waste of water resources.

[0035] 2) The secondary cooling box is equipped with a transparent glass panel, through which workers can observe the cooling status of the internal pipe body, promptly identify problems and take appropriate measures to ensure the smooth progress of the cooling process. It also allows for intuitive inspection of the spraying status, helping to maintain the normal operation of the equipment and ensure cooling effect.

[0036] 3) Sealing scrapers and wiper rubber rings are set inside the encapsulated sealed box to divide the inside of the box into multiple spraying stages, which improves the heat exchange efficiency and makes the cooling more sufficient. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] Figure 1 This is a schematic diagram of the overall external structure of an internal and external cooling device after tube extrusion molding;

[0038] Figure 2 Schematic diagram of the axial cross-sectional structure of the pipe extrusion die;

[0039] Figure 3 This is a partial schematic diagram of the axial section of the first-stage rapid cooling box;

[0040] Figure 4 It is a structural diagram of the pipe inlet I or the pipe outlet I;

[0041] Figure 5 This is a schematic diagram of the installation of the ring mounting frame in the all-alloy sealed box;

[0042] Figure 6This is a schematic diagram of the installation of support base I in the all-alloy sealed box;

[0043] Figure 7 It is a partial schematic diagram of the axial section of the secondary cooling box;

[0044] Figure 8 It is a structural diagram of the pipe inlet II or the pipe outlet II;

[0045] Figure 9 Schematic diagram of the installation of the annular mounting frame, support base II and driven support assembly in the encapsulated sealing box;

[0046] Figure 10 This is a schematic diagram of the installation of the sealing scraper in the package sealing box.

[0047] In the picture:

[0048] 1. Material extrusion device; 2. Pipe extrusion die; 2.1. Annular extrusion port; 3. Pipe body; 4. First-stage rapid cooling box; 4.1. All-alloy sealed box; 4.2. Pipe inlet I; 4.3. Pipe outlet I; 4.4. Support seat I; 4.41. Fixing frame; 4.42. Semi-circular arc smooth plate I; 5. Second-stage cooling box; 5.1. Encapsulated sealed box; 5.2. Pipe inlet II; 5.3. Pipe outlet II; 5.4. Support seat II; 5.41. Support plate; 5.42, semi-circular smooth plate II; 6, air guide channel; 6.1, air inlet; 6.2, air outlet; 7, "T"-shaped connecting rod; 8, diverter plate; 9, elastic rubber ring; 10, flange; 11, spray pipe; 12, sprinkler head; 13, annular mounting bracket; 13.1, pipe hole; 14, driven support assembly; 14.1, driven wheel; 14.2, wheel body bracket; 15, sealing scraper; 16, wiper rubber ring; 17, transparent glass plate. DETAILED DESCRIPTION

[0049] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings of the embodiments of the present invention. It should not be understood that the present invention is limited to the following examples. Without departing from the concept of the present invention, the deformation and improvement of the present invention in this field should be included in the protection scope of the claims of the present invention.

[0050] Unless otherwise defined, technical or scientific terms used in this disclosure should have the ordinary meanings understood by persons of ordinary skill in the art to which this disclosure belongs. Words such as "or," "comprising," and the like used in this disclosure mean that the elements or objects preceding the word include the elements or objects listed after the word and their equivalents, without excluding other elements or objects.

[0051] Example 1

[0052] This embodiment discloses an internal and external cooling device for a pipe after extrusion molding, which, as a preferred implementation of this embodiment, includes an internal cooling system and an external cooling system.

[0053] An internal cooling system is installed in the pipe extrusion die 2 to cool the pipe body 3 by accelerating air flow inside the pipe body 3. This air flow can be accelerated by blowing air axially from the pipe extrusion die 2 toward the pipe body 3, or by extracting air from the pipe body 3 through the pipe extrusion die 2. In this way, the rapid flow of air removes heat from the pipe body 3.

[0054] like Figure 1 As shown, in actual use, the feed end of the pipe extrusion die 2 is fixedly and sealedly connected to the discharge end of the material extrusion device 1. The external cooling system is coaxially arranged with the pipe extrusion die 2 and includes a primary rapid cooling box 4 and a secondary cooling box 5 arranged in sequence along the axis extension line of the pipe extrusion die 2.

[0055] The first-stage rapid cooling box 4 includes a fully alloy sealed box body 4.1, i.e., the first-stage rapid cooling box 4 is sealed with a fully alloy package to avoid explosions due to excessive internal temperatures and to prevent water leakage from affecting the workshop environment. The front and rear ends of the fully alloy sealed box body 4.1 are respectively provided with an inlet pipe Ⅰ 4.2 and an outlet pipe Ⅰ 4.3, which serve as the rapid cooling channel for the pipes. Inside the first-stage rapid cooling box 4, a pipe support unit Ⅰ and a first-stage spray unit are arranged based on the rapid cooling channel for the pipes. More specifically, the pipe support unit Ⅰ is arranged along the axial direction of the rapid cooling channel for the pipes, and the first-stage spray unit wraps the rapid cooling channel for the pipes in the circumferential and axial directions.

[0056] The secondary cooling box 5 comprises a sealed enclosure 5.1. The front and rear ends of the enclosure 5.1 feature pipe inlet II 5.2 and pipe outlet II 5.3, respectively. The pipe cooling channel is located between these two ports. Inside the secondary cooling box 5, a pipe support unit II and a secondary spray unit are arranged along the pipe cooling channel. More specifically, the pipe support unit II is arranged axially along the pipe cooling channel, while the secondary spray unit surrounds the pipe cooling channel both circumferentially and axially.

[0057] In this technical solution, the function of the first-stage rapid cooling box 4 is to enable the pipe body 3 to be cooled down quickly after being extruded, so that its shape is fixed. Because the temperature of the pipe body 3 is relatively high when it is just extruded, rapid cooling helps to maintain its dimensional accuracy and shape stability. The secondary cooling box 5 mainly takes away the remaining heat of the pipe body 3 after it passes through the first-stage rapid cooling box 4. After the initial cooling, the pipe body 3 may still have a certain residual temperature. Further cooling by the secondary cooling box 5 can ensure that the pipe body 3 is fully cooled and reaches a suitable temperature, thereby avoiding subsequent deformation problems or safety hazards caused by excessive temperature. Therefore, the first-stage rapid cooling box 4 should have better heat exchange performance than the second-stage cooling box 5. Based on this, within the same axial distance, the water spraying volume of the first-stage spray unit is greater than that of the second-stage spray unit.

[0058] Furthermore, a first drainage unit is provided at the bottom of the first-stage rapid cooling box 4, and a second drainage unit is provided at the bottom of the second-stage cooling box 5. Furthermore, the first drainage unit and the second drainage unit each include a water collection tank, the bottom of which is connected to a water pipe, through which the water after the spray pipe 11 is discharged for centralized treatment.

[0059] Therefore, this embodiment has the following advantages:

[0060] 1) Effective Cooling: The system utilizes a combination of internal and external cooling systems. The internal cooling system removes heat by accelerating air flow within the pipe, while the external cooling system's primary rapid cooling box 4 and secondary cooling box 5 sequentially cool the pipe. The primary rapid cooling box 4 rapidly cools the pipe to set its shape, while the secondary cooling box 5 removes any residual heat, ensuring sufficient cooling of the pipe. This effectively prevents deformation due to insufficient cooling and ensures pipe quality and dimensional accuracy.

[0061] 2) High cooling efficiency: Considering that the main function of the first-stage rapid cooling box 4 is to quickly cool down and shape, within the same axial distance, the water spray volume of the first-stage spray unit is greater than the water spray volume of the second-stage spray unit. This design can make the first-stage rapid cooling box 4 have better heat exchange performance and improve the cooling efficiency of the entire cooling device.

[0062] 3) High safety performance: The first-stage rapid cooling box 4 is encapsulated in a fully alloy sealed box 4.1, which can avoid explosions due to excessive internal temperatures and prevent water leakage from affecting the workshop environment, thereby improving the safety and stability of the device.

[0063] 4) Rational Structure: Both the primary rapid cooling box 4 and the secondary cooling box 5 are equipped with pipe support units to support the pipes and ensure their stable position in the cooling channel. Furthermore, the primary spray unit and the secondary spray unit wrap the pipe rapid cooling channel and the pipe cooling channel circumferentially and axially, respectively, for more uniform cooling.

[0064] 5) Convenient drainage: The first drainage unit at the bottom of the first-stage rapid cooling box 4 and the second drainage unit at the bottom of the second-stage cooling box 5 both contain a water collection tank. The bottom of the water collection tank is connected to a water pipe, which can guide the sprayed water out for centralized treatment, making drainage convenient and beneficial to the maintenance of the workshop environment.

[0065] Example 2

[0066] If the air flow direction inside the air tube body 3 aligns with the extrusion direction of the tube body 3, the air will transfer the temperature of the high-temperature end of the tube body 3 to the low-temperature end of the tube body 3. Furthermore, if air is introduced into the tube body 3 through the tube extrusion die 2, the air flow is essentially forced, which can easily lead to uneven air temperature distribution inside the tube body 3, resulting in unreasonable cooling rates and temperature gradients, and ultimately generating large internal stresses within the tube.

[0067] Based on this, this embodiment discloses an internal and external cooling device after the pipe is extruded. As a preferred embodiment of this embodiment, that is, based on Example 1, its internal cooling system includes a diverter plate 8 and an air guide channel 6 arranged inside the pipe extrusion die 2. Figure 2 As shown, the pipe extrusion die 2 is provided with an annular extrusion port 2.1, through which the pipe body 3 is extruded. Furthermore, an air guide channel 6 is provided in the pipe extrusion die 2. An air inlet 6.1 of the air guide channel 6 is axially located at the center of the discharge end of the pipe extrusion die 2. An air outlet 6.2 of the air guide channel 6 is radially located on the side of the pipe extrusion die 2 for connection to an external exhaust device. One or two air outlets 6.2 may be provided.

[0068] The diverter plate 8 is coaxially arranged at the discharge end of the pipe extrusion die 2 and is fixedly connected to the pipe extrusion die 2. More specifically, the diverter plate 8 can be circular, cylindrical or conical, etc., and is used to make the air inside the pipe body 3 flow along the inner wall of the pipe body 3 when it approaches the pipe extrusion die 2, thereby increasing the contact area between the air and the pipe body 3, thereby improving the heat exchange rate. Figure 2 As shown, the diverter plate 8 of this embodiment is set to be circular and is connected to the pipe extrusion die 2 through a "T"-shaped connecting rod 7. More specifically, the two ends of the head of the "T"-shaped connecting rod 7 are connected to the inner wall of the air guide channel 6, and the bottom of the "T"-shaped connecting rod 7 is connected to the axis of the diverter plate 8. A confluence gap is reserved between the diverter plate 8 and the pipe extrusion die 2. After the air flows through the diverter plate 8 along the inner wall of the pipe body 3, it flows into the air guide channel 6 from the confluence gap.

[0069] Compared with blowing cold air into the pipe body from the pipe extrusion die 2, this embodiment has the following advantages:

[0070] 1. Improve heat exchange efficiency

[0071] 1) The presence of the diverter plate 8 causes the air inside the tube body 3 to flow along the inner wall of the tube body 3 as it approaches the tube extrusion die 2. This increases the contact area between the air and the tube body 3, thereby improving the heat exchange rate. Compared to simply blowing cold air into the pipe, this method more fully utilizes the contact between the air and the tube body 3 for heat exchange.

[0072] 2) After the air flows along the inner wall of the pipe body 3 and passes through the diverter plate 8, it flows into the air guide channel 6 from the converging gap. During the whole process, the contact between the air and the pipe is more complete and orderly, and the heat exchange effect is better.

[0073] 2. Reasonable structural design

[0074] 1) The diverter plate 8 is connected to the pipe extrusion die 2 via a T-shaped connecting rod 7. This connection is stable and does not affect the pipe extrusion process. The ends of the T-shaped connecting rod 7 are connected to the inner wall of the air guide channel 6, and the bottom is connected to the axis of the diverter plate 8, ensuring that the position of the diverter plate 8 is fixed and reliable.

[0075] 2) The reserved confluence gap provides a reasonable channel for the flow of air, ensuring that the air can flow smoothly from the inside of the pipe body 3 into the air guide channel 6 and then be extracted by the external exhaust equipment, making the air flow of the entire system more reasonable and efficient.

[0076] 3. Cost and Operational Advantages

[0077] 1) Compared with blowing cold air into ducts, this solution does not require additional cooling equipment, reducing equipment costs and energy consumption.

[0078] 2) External exhaust equipment is relatively simple to use and has relatively low maintenance costs. At the same time, the exhaust method can better control the flow rate and flow of air, making it easier to adjust and optimize according to actual production conditions.

[0079] Example 3

[0080] This embodiment discloses an internal and external cooling device for post-extrusion pipes. As a preferred embodiment of this embodiment, based on Embodiments 1 or 2, elastic rubber rings 9 are provided at pipe inlet I 4.2, pipe outlet I 4.3, pipe inlet II 5.2, and pipe outlet II 5.3. More specifically, flanges 10 can be provided on either side of the elastic rubber rings 9 to secure them. The elastic rubber rings 9 function to scrape water off the surface of the pipe body 3 to prevent it from accumulating on the workshop floor.

[0081] Example 4

[0082] This embodiment discloses an internal and external cooling device for pipes after extrusion molding. As a preferred embodiment of this embodiment, based on Embodiments 1, 2, or 3, its first drainage unit includes P spray pipes 11 spaced circumferentially along the pipe rapid cooling channel. The second drainage unit includes Q spray pipes 11 spaced circumferentially along the pipe cooling channel, where P>Q. In this embodiment, P=16 and Q=12, and the sizes of P and Q can be adjusted according to actual needs. All spray pipes 11 are respectively provided with nozzles 12 at intervals, and the gaps between adjacent nozzles 12 are designed according to actual needs.

[0083] To facilitate installation, the first and second drainage units each further include an annular mounting frame 13. The annular mounting frame 13 is provided with pipe holes 13.1 spaced circumferentially according to the number of spray pipes 11. Specifically, the annular mounting frame 13 of the first drainage unit has 16 pipe holes 13.1, while the annular mounting frame 13 of the second drainage unit has 12 pipe holes 13.1.

[0084] Example 5

[0085] This embodiment discloses an internal and external cooling device for pipes after extrusion molding. As a preferred implementation of this embodiment, that is, based on Embodiment 1, 2, 3 or 4, its pipeline support unit I includes a plurality of support seats I4.4 arranged at intervals along the axial direction of the pipe rapid cooling channel; the support seat I4.4 includes a fixing frame 4.41 and a semi-circular smooth plate I4.42; the semi-circular smooth plate I4.42 is fixedly connected to the all-alloy sealed box body 4.1 through the fixing frame 4.41.

[0086] Furthermore, the pipe support unit II includes several support seats II5.4 arranged at intervals along the axial direction of the pipe cooling channel. The support seat II5.4 includes a support plate 5.41. A semicircular notch is opened on the top of the support plate 5.41, and a semicircular smooth plate II5.42 is installed along the semicircular notch.

[0087] Example 6

[0088] This embodiment discloses an internal and external cooling device for post-extrusion pipes. As a preferred embodiment of this embodiment, based on Embodiments 1, 2, 3, 4, or 5, pipe support unit II further includes a plurality of driven support assemblies 14 spaced axially along the pipe cooling channel. Driven support assemblies 14 include driven pulleys 14.1 and pulley brackets 14.2, with driven pulleys 14.1 mounted on pulley brackets 14.2. In this embodiment, the design of driven support assemblies 14 supports the pipe body while reducing resistance to axial movement of the pipe body due to contact friction.

[0089] Example 7

[0090] This embodiment discloses an internal and external cooling device after tube extrusion molding. As a preferred implementation of this embodiment, that is, based on Embodiment 1, 2, 3, 4, 5 or 6, transparent glass plates 17 are spliced ​​and embedded on the left and right sides of the encapsulated sealed box body 5.1.

[0091] Thus, the staff can observe the cooling status of the pipes inside the secondary cooling box 5 through the transparent glass plate 17, such as whether the pipes are operating normally in the cooling channel, whether there are any blockages or other abnormalities. This allows timely detection of problems and the implementation of appropriate measures to ensure the smooth progress of the cooling process.

[0092] In addition, the spraying condition can be checked visually. It can be seen whether the spraying of the secondary spray unit is uniform, whether the nozzle 12 is blocked or damaged, etc., which helps to maintain the normal operation of the equipment and ensure the cooling effect.

[0093] Example 8

[0094] This embodiment discloses an internal and external cooling device for post-extrusion tubing. As a preferred embodiment of this embodiment, based on Embodiments 1, 2, 3, 4, 5, 6, or 7, a plurality of sealing scrapers 15 are axially spaced apart within a sealed enclosure 5.1. These sealing scrapers 15 are provided with circular tubing perforations, along which rubber wiper rings 16 are positioned. In this manner, n sealing scrapers 15 axially divide the interior of the sealed enclosure 5.1 into n+1 spray stages. As the tubing 3 passes through a sealing scraper 15, it removes water remaining on the tubing 3 from the previous spray stage, facilitating direct contact between the spray water of the next stage and the tubing 3, thereby improving heat exchange efficiency.

Claims

1. An internal and external cooling device for pipes after extrusion molding, characterized in that: It comprises an internal cooling system and an external cooling system; the internal cooling system is arranged in the pipe extrusion die (2) and is used to cool the pipe body (3) by accelerating the air flow inside the pipe body (3); the external cooling system is arranged coaxially with the pipe extrusion die (2), and comprises a first-stage rapid cooling box (4) and a second-stage cooling box (5) arranged in sequence along the extension line of the axis of the pipe extrusion die (2); The first-stage rapid cooling box (4) comprises an all-alloy sealed box body (4.1), wherein a pipe inlet I (4.2) and a pipe outlet I (4.3) are respectively provided at the front and rear ends of the all-alloy sealed box body (4.1), and the pipe inlet I (4.2) and the pipe outlet I (4.3) serve as a pipe rapid cooling channel; a pipe support unit I and a first-stage spray unit are arranged inside the first-stage rapid cooling box (4) based on the pipe rapid cooling channel; and a first drainage unit is provided at the bottom of the first-stage rapid cooling box (4); The secondary cooling box (5) comprises a sealed encapsulated box body (5.1), the front and rear ends of the sealed encapsulated box body (5.1) are respectively provided with an inlet port II (5.2) and an outlet port II (5.3), and a pipe cooling channel is provided between the inlet port II (5.2) and the outlet port II (5.3); a pipe support unit II and a secondary spray unit are arranged inside the secondary cooling box (5) based on the pipe cooling channel; and a second drainage unit is provided at the bottom of the secondary cooling box (5); Within the same axial distance, the water spraying volume of the first-stage spray unit is greater than that of the second-stage spray unit.

2. The internal and external cooling device for a pipe after extrusion molding according to claim 1, characterized in that: The internal cooling system includes a diverter plate (8) and an air guide channel (6) arranged inside the pipe extrusion die (2); The air inlet (6.1) of the air guide channel (6) is axially opened at the axis of the discharge end of the pipe extrusion die (2); the air outlet (6.2) of the air guide channel (6) is radially opened on the side of the pipe extrusion die (2) for connecting to an external exhaust device; The diverter plate (8) is coaxially arranged at the discharge end of the pipe extrusion die (2) and is fixedly connected to the pipe extrusion die (2).

3. The internal and external cooling device for a pipe after extrusion molding according to claim 1, characterized in that: Elastic rubber rings (9) are respectively provided at the pipe inlet I (4.2), the pipe outlet I (4.3), the pipe inlet II (5.2) and the pipe outlet II (5.3).

4. The internal and external cooling device for a pipe after extrusion molding according to claim 1, characterized in that: The first drainage unit comprises P spray pipes (11) arranged at intervals along the circumference of the pipe rapid cooling channel, and the second drainage unit comprises Q spray pipes (11) arranged at intervals along the circumference of the pipe cooling channel; wherein P>Q, and nozzles (12) are arranged at intervals on all the spray pipes (11).

5. The internal and external cooling device for a pipe after extrusion molding according to claim 4, characterized in that: The first drainage unit and the second drainage unit further comprise an annular mounting frame (13), respectively; on the annular mounting frame (13), pipe penetration holes (13.1) are circumferentially spaced according to the number of spray pipes (11).

6. The internal and external cooling device for a pipe after extrusion molding according to claim 1, characterized in that: The pipeline support unit I comprises a plurality of support seats I (4.4) arranged at intervals along the axial direction of the pipe rapid cooling channel; the support seat I (4.4) comprises a fixing frame (4.41) and a semi-circular arc-shaped smooth plate I (4.42); the semi-circular arc-shaped smooth plate I (4.42) is fixedly connected to the all-alloy sealed box (4.1) via the fixing frame (4.41).

7. The internal and external cooling device for a pipe after extrusion molding according to claim 1, characterized in that: The pipe support unit II comprises a plurality of support seats II (5.4) arranged at intervals along the axial direction of the pipe cooling channel. The support seat II (5.4) comprises a support plate (5.41). A semicircular notch is provided on the top of the support plate (5.41), and a semicircular smooth plate II (5.42) is installed along the semicircular notch.

8. The internal and external cooling device for a pipe after extrusion molding according to claim 1, characterized in that: The pipeline support unit II further comprises a plurality of driven support assemblies (14) arranged at intervals along the axial direction of the pipe cooling channel; the driven support assembly (14) comprises a driven wheel (14.1) and a wheel body bracket (14.2), and the driven wheel (14.1) is mounted on the wheel body bracket (14.2).

9. The internal and external cooling device for a pipe after extrusion molding according to claim 1, characterized in that: Transparent glass plates (17) are spliced ​​and embedded on the left and right sides of the packaging and sealing box (5.1).

10. The internal and external cooling device for a pipe after extrusion molding according to claim 1, characterized in that: Inside the packaged sealing box (5.1), a plurality of sealing scrapers (15) are arranged at intervals along the axial direction. The sealing scrapers (15) are provided with circular tube perforations, and wiper rubber rings (16) are arranged along the circular tube perforations.

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