A cooling device for pipe extrusion molding die

Abstract

This utility model discloses a cooling device for a pipe extrusion molding die, including an extrusion head, a transition connecting seat, and a sizing copper sleeve arranged coaxially. The outer circumference of the sizing copper sleeve is divided into three sections along the material conveying direction, with corresponding cooling units one, two, and three. It also includes a temperature monitoring module and a control module. By matching the cooling requirements of different locations with a segmented cooling structure and combining intelligent temperature control to dynamically adjust the cooling medium flow rate, it solves the problems of uneven cooling and low temperature control accuracy in traditional methods, improving pipe forming quality (wall thickness deviation ≤0.5%, ellipticity ≤0.8%) and production efficiency, while reducing energy consumption.

Description

Technical Field

[0001] This utility model relates to the technical field of plastic pipe processing equipment, and in particular to a cooling device for pipe extrusion molding die. Background Technology

[0002] In the extrusion molding process of plastic pipes (such as PVC pipes, PE pipes, PPR pipes, etc.), the sizing assembly is the core component that determines the pipe's dimensional accuracy, surface quality, and production efficiency. The sizing copper sleeve, as a key component of the sizing assembly, functions to rapidly cool and solidify the material through heat exchange with the high-temperature molten material, forming a pipe shape that meets specifications. However, existing cooling methods for sizing copper sleeves generally have the following shortcomings: 1. Poor cooling uniformity: Traditional sizing copper sleeves often use a single cooling channel or a uniformly distributed water structure on the surface. However, because the cooling process of the material within the sizing copper sleeve is phased (the material temperature is high in the inlet section, requiring rapid cooling; the intermediate section requires stable temperature control; and the outlet section needs to avoid overcooling and shrinkage), a single cooling mode is difficult to match the heat exchange requirements of different locations. This easily leads to excessively high or low local temperatures in the sizing copper sleeve, resulting in problems such as uneven pipe wall thickness and excessive ellipticity (e.g., roundness error > 1%). 2. Insufficient temperature control accuracy: Existing cooling systems mostly rely on manual adjustment of the cooling medium (such as water or oil) flow rate, lacking real-time temperature monitoring and dynamic feedback mechanisms. This makes it impossible to accurately adjust the cooling intensity of each area according to actual cooling needs, resulting in low cooling efficiency and high energy consumption (traditional cooling methods consume 15%-30% more energy than the theoretical optimal value). Furthermore, they are difficult to adapt to the switching needs of different pipe specifications (such as pipe diameters from φ50mm to φ300mm). 3. Poor maintenance convenience: Traditional sizing copper sleeves are mostly integral structures, fixedly connected to components such as transition connectors. When the sizing copper sleeve wears down due to long-term use or needs to be adapted to different pipe specifications, disassembly and replacement are complex, resulting in long downtime and severely impacting production efficiency.

[0003] Therefore, there is an urgent need for a sizing component cooling device that can achieve segmented and precise cooling, has intelligent temperature control function, and is easy to maintain, in order to solve the above-mentioned technical problems. Utility Model Content

[0004] The technical problem to be solved by this utility model is to overcome the defects of the prior art and provide a cooling device for pipe extrusion molding die.

[0005] To solve the above-mentioned technical problems, this utility model provides the following technical solution:

[0006] This utility model discloses a cooling device for a pipe extrusion molding die, comprising an extrusion head, a transition connecting seat, and a sizing assembly coaxially arranged; one end of the extrusion head is sealed to one end of the transition connecting seat, and the other end of the transition connecting seat is detachably connected to a sizing copper sleeve of the sizing assembly; the sizing copper sleeve is located at the other end of the transition connecting seat, and its outer circumference is sequentially provided with cooling groove group one, cooling groove group two, and cooling groove group three along the pipe conveying direction; cooling unit one, cooling unit two, and cooling unit three are respectively provided on the outer side of the sizing copper sleeve corresponding to cooling groove group one, cooling groove group two, and cooling groove group three; the interiors of the extrusion head, the transition connecting seat, and the sizing copper sleeve are interconnected to form a material passage. The material channel has its axis coincident with the axis of the sizing copper sleeve; it also includes a temperature monitoring module and a control module; the temperature monitoring module includes temperature sensor 1, temperature sensor 2, and temperature sensor 3 respectively disposed on the inner walls of cooling tank group 1, cooling tank group 2, and cooling tank group 3, and also includes temperature sensor 4 disposed at the water outlet of cooling unit 3; the control module is electrically connected to the execution components of cooling unit 1, cooling unit 2, and cooling unit 3 and temperature sensor 1, temperature sensor 2, and temperature sensor 3 respectively, and is used to adjust the cooling medium flow rate of each cooling unit according to the temperature signals fed back by temperature sensor 1, temperature sensor 2, and temperature sensor 3.

[0007] As a preferred technical solution of this utility model, one end of the transition connecting seat is sealed to the extrusion head through a conical surface fit, and the other end is detachably connected to the sizing copper sleeve through an annular positioning boss; an annular cooling water channel is provided on the outer periphery of the transition connecting seat, and the annular cooling water channel is connected to an external cooling water source.

[0008] As a preferred technical solution of this utility model, the cooling unit includes a plurality of cooling branch pipes embedded in the cooling tank group along the axial direction. One end of each cooling branch pipe passes through the end face of the sizing copper sleeve and extends to the outside of the transition connection seat. The inlet end of each cooling branch pipe is connected to a diversion valve, and the outlet end is connected to a collection valve.

[0009] As a preferred embodiment of this utility model, the second cooling unit includes an annular cooling sleeve fitted around the outer periphery of the sizing copper sleeve. The inlet end of the annular cooling sleeve is provided with a flow regulating valve, which is electrically connected to the control module. The inner wall of the annular cooling sleeve is in clearance fit with the outer wall of the sizing copper sleeve, and a spiral guide groove is formed on the inner wall of the annular cooling sleeve, which is connected to the second cooling tank assembly. The outer periphery of the annular cooling sleeve is provided with heat dissipation fins.

[0010] As a preferred embodiment of this utility model, the cooling unit three includes a spiral cooling pipe that passes through the inside of the sizing copper sleeve. One end of the spiral cooling pipe extends to the end face of the sizing copper sleeve and is sealed. The water inlet end of the spiral cooling pipe is connected to a proportional regulating valve, and the water outlet end is connected to a temperature sensor four. The temperature sensor four is electrically connected to the control module.

[0011] As a preferred embodiment of this utility model, the number of cooling pipes is 3-5, which are evenly distributed along the circumference of the sizing copper sleeve, and the distance between two adjacent cooling pipes is 5-8mm; the gap between the outer wall of the cooling pipe and the bottom surface of the cooling tank assembly is 0.3-0.5mm.

[0012] As a preferred embodiment of this utility model, the gap between the annular cooling sleeve and the sizing copper sleeve is 0.5-1.2mm; the helix angle of the spiral guide groove is 15°-45°.

[0013] As a preferred embodiment of this utility model, the spiral cooling pipe has a spiral angle of 30°-60° and a pipe diameter of 8-12mm; the gap between the spiral cooling pipe and the inner wall of the sizing copper sleeve is 1-2mm.

[0014] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0015] 1. The sizing copper sleeve is sequentially equipped with three cooling tank groups along the material conveying direction: Cooling Tank Group 1, Cooling Tank Group 2, and Cooling Tank Group 3, each matched with Cooling Unit 1 (splitter cooling), Cooling Unit 2 (spiral guide ring sleeve cooling), and Cooling Unit 3 (internal spiral tube cooling). Cooling Unit 1 rapidly distributes cooling to the inlet section (high-temperature material zone) of the sizing copper sleeve through multiple evenly distributed cooling pipes, increasing the heat exchange area. Cooling Unit 2 extends the flow path of the cooling medium through spiral guide channels, improving the heat exchange uniformity of the intermediate section (stable cooling zone). Cooling Unit 3 directly contacts the inner wall of the sizing copper sleeve through spiral cooling pipes, and dynamically adjusts the temperature of the outlet section (precision temperature control zone) using a proportional regulating valve. The synergistic effect of these three cooling sections can control the overall temperature difference of the sizing copper sleeve within ±2℃, significantly reducing pipe wall thickness deviation (≤0.5%) and ellipticity (≤0.8%), and improving surface finish (reducing scratches, pits, and other defects).

[0016] 2. The temperature monitoring module collects the medium temperature of each cooling tank group in real time through temperature sensors one to three. The control module dynamically adjusts the flow divider valve, proportional regulating valve, and other actuators of the cooling unit based on the feedback signal to achieve precise matching of the cooling medium flow rate. Compared with traditional manual adjustment, this system improves cooling efficiency by 20%-25%, reduces energy consumption by 15%-20%, and can quickly adapt to the production needs of different pipe specifications (e.g., when changing pipe diameter, only the flow parameters of each cooling unit need to be adjusted), shortening the changeover time.

[0017] 3. The transition connecting seat and the sizing copper sleeve are detachably connected by an annular positioning boss. Combined with the segmented layout of the cooling unit, when the sizing copper sleeve is worn or needs to be replaced, it can be disassembled simply by loosening the positioning boss. The operation is simple and the downtime is reduced from the traditional 2-4 hours to 0.5-1 hour, which significantly improves the equipment utilization rate.

[0018] 4. The annular cooling water channel on the outer periphery of the transition connector can simultaneously cool the connection area between the extruder head and the sizing copper sleeve, avoiding component deformation caused by heat conduction, ensuring the coaxiality of the material channel (error ≤ 0.1mm), and further improving the dimensional accuracy of pipe forming. Attached Figure Description

[0019] The accompanying drawings are provided to further illustrate the present invention and form part of the specification. They are used together with the embodiments of the present invention to explain the present invention, but do not constitute a limitation thereof. In the drawings:

[0020] Figure 1 This is a cross-sectional structural diagram of the present invention;

[0021] Figure 2 This is a partial enlargement of the present invention;

[0022] Figure 3 This is a schematic diagram of the overall structure of this utility model;

[0023] Figure 4 This is the front view of this utility model;

[0024] In the diagram: 1. Extrusion head; 2. Sizing copper sleeve; 3. Cooling unit one; 4. Cooling unit two; 5. Cooling unit three; 6. Temperature monitoring module; 7. Transition connector; 8. Control module; 9. Material channel; 21. Cooling tank group one; 22. Cooling tank group two; 23. Cooling tank group three; 31. Cooling branch pipe; 32. Diverter valve; 33. Combiner valve; 41. Annular cooling jacket; 51. Spiral cooling pipe; 52. Proportional regulating valve; 53. Temperature sensor four; 61. Temperature sensor one; 62. Temperature sensor two; 63. Temperature sensor three; 71. Positioning boss; 72. Annular cooling water channel; 411. Spiral guide groove; 412. Heat dissipation fins. Detailed Implementation

[0025] The preferred embodiments of the present invention will be described below with reference to the accompanying drawings. It should be understood that the preferred embodiments described herein are for illustration and explanation only and are not intended to limit the present invention.

[0026] In the attached diagram, all identical reference numerals refer to the same components.

[0027] Example 1

[0028] like Figure 1-4 As shown, this embodiment provides a cooling device for a pipe extrusion molding die, used for cooling the sizing copper sleeve in plastic pipe extrusion molding. The device includes an extrusion head 1, a transition connecting seat 7, and a sizing copper sleeve 2 arranged coaxially, which are connected internally to form a material channel 9, and the axis of the material channel 9 coincides with the axis of the sizing copper sleeve 2.

[0029] The end of the extruder head 1 is sealed to one end of the transition connecting seat 7 through a conical surface fit. The other end of the transition connecting seat 7 is detachably connected to the sizing copper sleeve 2 through an annular positioning boss 71, which facilitates the replacement of sizing copper sleeves 2 of different specifications. Cooling tank group 1 21, cooling tank group 22, and cooling tank group 3 23 are sequentially opened on the outer circumference of the sizing copper sleeve 2 along the material conveying direction, and cooling unit 1 3, cooling unit 2 4, and cooling unit 3 5 are respectively set up.

[0030] Cooling unit 3 includes several cooling branch pipes 31 embedded along the axial direction of cooling tank assembly 21. One end of each cooling branch pipe 31 passes through one end face of the sizing copper sleeve 2 and extends to the outside of the transition connecting seat 7. The inlet end of each cooling branch pipe 31 is connected to a diversion valve 32, and the outlet end is connected to a collection valve 33. When the material enters the inlet section of the sizing copper sleeve 2 (where the temperature is highest), the cooling medium is distributed to each cooling branch pipe 31 through the diversion valve 32. It flows through the gap between the outer wall of the branch pipe and the inner wall of the cooling tank assembly 21, quickly absorbing the heat of the sizing copper sleeve 2, thus achieving efficient cooling of the inlet section.

[0031] The transition connector 7 has an annular cooling water channel 72 on its outer periphery, which is connected to an external cooling water source. This channel can simultaneously cool the connection area between the extruder head 1 and the sizing copper sleeve 2, thus preventing component deformation due to heat conduction.

[0032] Example 2

[0033] The difference between this embodiment and embodiment one lies in the structural design of cooling unit two 4. Cooling unit two 4 includes an annular cooling sleeve 41 sleeved on the outer periphery of the sizing copper sleeve 2. The inner wall of the annular cooling sleeve 41 is clearance-fitted with the outer wall of the sizing copper sleeve 2. The inner wall is provided with a spiral guide groove 411, which is connected to the cooling tank assembly two 22. Heat dissipation fins 412 are provided on the outer periphery of the annular cooling sleeve 41.

[0034] When the material is in the middle section of the sizing copper sleeve 2 (where the temperature is higher and needs to be stably controlled), the cooling medium is introduced by the external pump into the gap between the annular cooling sleeve 41 and the sizing copper sleeve 2, and flows spirally along the spiral guide groove 411, extending the contact time with the sizing copper sleeve 2. At the same time, the heat dissipation fins 412 increase the external heat dissipation area, improve the heat exchange uniformity, and avoid pipe wall thickness deviation caused by uneven cooling in the middle section.

[0035] The temperature monitoring module 6 includes temperature sensors 61, 62, and 63 installed on the inner walls of cooling tank group 1 21, cooling tank group 22, and cooling tank group 3 23, respectively, which collect the temperature of the cooling medium in each section in real time and feed it back to the control module 8. The control module 8 adjusts the flow divider valve 32 (cooling unit 1 3) according to the temperature signal to adjust the flow rate of the cooling medium flowing to the spiral guide channel 411. Dynamic control is achieved through the flow regulating valve to ensure that the temperature of the intermediate section is stable within the set range.

[0036] Example 3

[0037] This embodiment focuses on describing the structure and function of cooling unit 3 5. Cooling unit 3 5 includes a spiral cooling pipe 51 that passes through the inside of the sizing copper sleeve 2. One end of the spiral cooling pipe 51 extends to the end face of the sizing copper sleeve 2 and is sealed. The water inlet end is connected to the proportional regulating valve 52, and the water outlet end is connected to the temperature sensor 4 53. The temperature sensor 4 53 is electrically connected to the control module 8.

[0038] When the material reaches the outlet section of the sizing copper sleeve 2 (precise temperature control is required to avoid shrinkage and deformation), the cooling medium is input into the spiral cooling pipe 51 at a set flow rate through the proportional regulating valve 52. The gap (1-2mm) between the spiral cooling pipe 51 and the inner wall of the sizing copper sleeve 2 forms a thin layer of heat exchange. Combined with the spiral structure, the flow path is extended, improving the heat exchange efficiency. The temperature sensor 4 53 monitors the temperature of the cooling medium in the outlet section in real time and feeds it back to the control module 8. The flow rate is dynamically adjusted through the proportional regulating valve 52 to achieve precise control of the outlet section temperature (error ≤ ±2℃), avoiding shrinkage or excessive ellipticity of the pipeline due to local overcooling.

[0039] In this embodiment, the annular cooling water channel 72 of the transition connector 7 can be further optimized. By adjusting the cooling water flow rate, the temperature of the connection area between the extruder head 1 and the sizing copper sleeve 2 can be balanced, ensuring the coaxiality of the material channel 9 (error ≤ 0.1 mm) and improving the consistency of pipe forming.

[0040] In summary, the three embodiments effectively solve the problems of uneven cooling, low temperature control accuracy and inconvenient maintenance of traditional cooling devices through segmented cooling structure (cooling unit 1 to cooling unit 3 to 5), intelligent temperature control system (temperature sensor 1 to temperature sensor 4 to control module 8) and modular connection design (annular positioning boss 71 and detachable transition connector 7), and are suitable for extrusion molding production of plastic pipes of different specifications.

[0041] This utility model is a cooling device for pipe extrusion molding molds. Through the combination of structural innovation and intelligent control technology, it effectively solves the shortcomings of traditional sizing component cooling devices. It has significant advantages in improving pipe molding quality, reducing energy consumption and increasing production efficiency, and is suitable for the industrial production of plastic pipe extrusion molding.

[0042] Finally, it should be noted that the above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A cooling device for a pipe extrusion molding die, characterized in that, The assembly includes a coaxially arranged extrusion head (1), a transition connecting seat (7), and a sizing assembly; the end of the extrusion head (1) is sealed to one end of the transition connecting seat (7), and the other end of the transition connecting seat (7) is detachably connected to the sizing copper sleeve (2) of the sizing assembly; the sizing copper sleeve (2) is located at the other end of the transition connecting seat (7), and its outer circumference is sequentially provided with cooling tank group one (21), cooling tank group two (22), and cooling tank group three (23) along the pipeline conveying direction; the outer side of the sizing copper sleeve (2) is provided with cooling unit one (3), cooling unit two (4), and cooling unit three (5) respectively corresponding to the cooling tank group one (21), cooling tank group two (22), and cooling tank group three (23); the extrusion head (1), the transition connecting seat (7), and the sizing copper sleeve (2) form a material channel (9) through which the axis of the material channel (9) is aligned with the pipeline conveying direction. The axis of the sizing copper sleeve (2) is coincident; it also includes a temperature monitoring module (6) and a control module (8); the temperature monitoring module (6) includes temperature sensor 1 (61), temperature sensor 2 (62), and temperature sensor 3 (63) respectively disposed on the inner wall of the cooling tank group 1 (21), cooling tank group 2 (22), and cooling tank group 3 (23), and also includes temperature sensor 4 (53) disposed at the water outlet of the cooling unit 3 (5); the control module (8) is electrically connected to the execution components of the cooling unit 1 (3), cooling unit 2 (4), and cooling unit 3 (5) and the temperature sensor 1 (61), temperature sensor 2 (62), and temperature sensor 3 (63) respectively, and is used to adjust the cooling medium flow rate of each cooling unit according to the temperature signal fed back by the temperature sensor 1 (61), temperature sensor 2 (62), and temperature sensor 3 (63).

2. The cooling device for pipe extrusion molding die according to claim 1, characterized in that, One end of the transition connecting seat (7) is sealed to the extrusion head (1) through a conical surface fit, and the other end is detachably connected to the sizing copper sleeve (2) through an annular positioning boss (71); an annular cooling water channel (72) is provided on the outer periphery of the transition connecting seat (7), and the annular cooling water channel (72) is connected to an external cooling water source.

3. The cooling device for pipe extrusion molding die according to claim 1, characterized in that, The cooling unit (3) includes several cooling pipes (31) embedded in the cooling tank group (21) along its axial direction. One end of each cooling pipe (31) passes through the end face of the sizing copper sleeve (2) and extends to the outside of the transition connection seat (7). The inlet end of each cooling pipe (31) is connected to a diversion valve (32), and the outlet end is connected to a collection valve (33).

4. The cooling device for pipe extrusion molding die according to claim 1, characterized in that, The second cooling unit (4) includes an annular cooling sleeve (41) fitted around the outer periphery of the fixed-sizing copper sleeve (2). The inlet end of the annular cooling sleeve (41) is provided with a flow regulating valve, which is electrically connected to the control module (8). The inner wall of the annular cooling sleeve (41) is in clearance fit with the outer wall of the fixed-sizing copper sleeve (2), and the inner wall of the annular cooling sleeve (41) is provided with a spiral guide groove (411), which is connected to the second cooling tank group (22). The outer periphery of the annular cooling sleeve (41) is provided with heat dissipation fins (412).

5. The cooling device for pipe extrusion molding die according to claim 1, characterized in that, The cooling unit three (5) includes a spiral cooling pipe (51) that passes through the inside of the sizing copper sleeve (2). One end of the spiral cooling pipe (51) extends to the end face of the sizing copper sleeve (2) and is sealed. The inlet end of the spiral cooling pipe (51) is connected to a proportional regulating valve (52), and the outlet end is connected to a temperature sensor four (53). The temperature sensor four (53) is electrically connected to the control module (8).

6. The cooling device for pipe extrusion molding die according to claim 3, characterized in that, The number of cooling pipes (31) is 3-5, and they are evenly distributed along the circumference of the sizing copper sleeve (2). The distance between two adjacent cooling pipes (31) is 5-8mm. The gap between the outer wall of the cooling pipe (31) and the bottom surface of the cooling tank group (21) is 0.3-0.5mm.

7. The cooling device for pipe extrusion molding die according to claim 4, characterized in that, The gap between the annular cooling sleeve (41) and the sizing copper sleeve (2) is 0.5-1.2 mm; the spiral angle of the spiral guide groove (411) is 15°-45°.

8. The cooling device for pipe extrusion molding die according to claim 5, characterized in that, The spiral cooling pipe (51) has a spiral angle of 30°-60° and a pipe diameter of 8-12mm; the gap between the spiral cooling pipe (51) and the inner wall of the sizing copper sleeve (2) is 1-2mm.

Images