Cooling structure of a screw assembly and pipe extrusion die

Abstract

The utility model discloses a kind of cooling structure and pipe extrusion mould of helix assembly, belong to plastic pipe forming technical field. Including: helix and helix sleeve, both form helix flow channel between two and both constitute helix assembly, the feed end of helix assembly is located at the entrance of helix flow channel;The feed end surface of helix and / or helix sleeve is equipped with multiple groups of annularly distributed cooling flow channels, each cooling flow channel is independent, and the both ends of cooling flow channel are cooling medium inlet and cooling medium outlet respectively;Each cooling flow channel is composed of at least two oblique holes in communication, and the opening between cooling medium inlet and cooling medium outlet is sealed by plug. By adopting the structure of non-central feeding, the feed end surface of helix assembly is retained enough solid area to directly process multiple cooling flow channels, fundamentally solves the problem that traditional blind hole helix cannot arrange internal cooling channel, significantly improves cooling efficiency and temperature uniformity.

Description

Technical Field

[0001] This utility model belongs to the field of plastic pipe forming technology, specifically relating to a cooling structure for a spiral component and a pipe extrusion mold. Background Technology

[0002] Existing plastic pipe extrusion dies typically employ a spiral feeding method for cross-sectional flow division. This spiral is generally designed as a center-feed structure, meaning that the molten material enters from the feed hole in the center of the spiral and is divided into multiple flow channels that are radially distributed from the inside out.

[0003] Due to this center-feed, periphery-discharge flow channel layout, a complete central blind hole must be reserved inside the spiral to machine the feeding channel, and multiple flow channels extend radially outward from the central hole. Under this structural constraint, the feeding end face of the spiral is occupied by the central feeding hole and multiple radial flow channels, lacking sufficient solid material area to open additional cooling medium circulation channels.

[0004] Therefore, traditional solutions cannot directly integrate cooling channels on the spiral body and can only rely on built-in oil cooling devices—that is, inserting independent oil pipes, connectors and other cooling elements into the internal cavity or peripheral gaps of the spiral body to achieve heat dissipation through indirect heat conduction.

[0005] However, this built-in oil cooling method has obvious drawbacks: On the one hand, under high-temperature working conditions, gaps are easily generated between the spiral body and the cooling device due to the difference in thermal expansion, resulting in poor thermal contact. The heat transfer efficiency decreases with the use time, and the system needs to operate at high power continuously to maintain the cooling effect, resulting in high energy consumption and high cost. On the other hand, the built-in oil pipes and connecting joints are in a high-temperature and high-pressure environment for a long time, which poses a risk of oil leakage and reduces the reliability and service life of the equipment. Summary of the Invention

[0006] This utility model addresses the aforementioned problems in the existing technology by proposing a cooling structure for a spiral assembly and a tube extrusion die.

[0007] This utility model can be achieved through the following technical solutions: A cooling structure for a helical assembly includes: The spiral body and the spiral body jacket together form a spiral assembly and a spiral flow channel is formed between them; The spiral body and / or the spiral body jacket have multiple sets of cooling channels distributed in the circumferential direction on the feed end face, and each cooling channel is set independently to each other. The cooling channel is located at the two ends of the spiral body and / or the feed end face of the spiral body jacket, which are the cooling medium inlet and the cooling medium outlet, respectively. Each set of cooling channels consists of at least two oblique holes connected end to end, wherein the opening between the cooling medium inlet and the cooling medium outlet on the feed end face of the spiral body and / or the spiral body outer sleeve is sealed by a plug.

[0008] As a further improvement of this utility model, when both the spiral body and the spiral body jacket are provided with cooling channels, the cooling channels of the two are staggered.

[0009] As a further improvement of this utility model, each group of cooling channels is connected to an external mold temperature controller to form an independent cooling medium circulation channel, and the mold temperature controller is connected to the control system signal.

[0010] As a further improvement of this utility model, the inner wall of the spiral and / or the outer wall of the spiral sheath are respectively provided with a plurality of thermocouples, and the thermocouples are connected to the control system signal.

[0011] As a further improvement of this utility model, the control system adjusts the circulation flow rate and temperature of the corresponding cooling channel according to the temperature detected by the thermocouple.

[0012] As a further improvement of this utility model, both the spiral body and the spiral body jacket are arranged in a ring structure, and the thermocouples are distributed circumferentially on the inner wall of the spiral body and the outer wall of the spiral body jacket.

[0013] A pipe extrusion die, comprising: The cooling structure of the aforementioned spiral assembly; The manifold and the connector are connected as follows: the feed end of the manifold is connected to an external screw extruder, and the discharge end of the manifold is connected to the auger assembly through the connector, which is connected to the mating surface between the auger and the auger jacket.

[0014] As a further improvement of this utility model, the feed end of the diverter plate is located at the center of its feed end face, and its discharge end is circumferentially distributed on the outside of its discharge end face and communicates with the connecting member.

[0015] As a further improvement of this utility model, a central through hole is formed in the middle of the spiral assembly, and an air inlet pipe is arranged in the central through hole. An in-mold air cooling channel is formed between the air inlet pipe and the inner wall of the spiral.

[0016] As a further improvement of this utility model, the spiral body is provided with a circumferential exhaust pipe at the end of the central through hole. One end of the circumferential exhaust pipe is connected to the in-mold air-cooling channel, and the other end is connected to an external variable frequency suction fan.

[0017] Compared with the prior art, the present invention has the following beneficial effects: 1. Breaking through traditional structural limitations to achieve efficient integrated cooling: By adopting a non-central feeding manifold and connector design, the feeding end face of the spiral assembly retains a sufficient solid area, allowing multiple independent inclined hole cooling channels to be directly machined on it without relying on a built-in oil cooling device. This fundamentally solves the problem that traditional blind hole spirals cannot arrange internal cooling channels, significantly improving cooling efficiency and temperature uniformity, while eliminating safety hazards, reducing manufacturing costs, and reducing energy consumption.

[0018] 2. Construct a zoned closed-loop temperature control system to improve molding quality and energy efficiency: By combining circumferentially distributed independent cooling channels, mold temperature controllers and thermocouple feedback, the system achieves zoned, dynamic, and closed-loop control of the circumferential temperature field of the spiral body; with the staggered channel layout and uniform temperature measurement, it effectively suppresses melt flow fluctuations, wall thickness deviations and surface defects, while adjusting the cooling intensity as needed to reduce energy consumption and improve production stability and product precision.

[0019] 3. Enhanced structural reliability and safety through synergistic composite cooling: In addition to end-face liquid cooling, an in-mold air-cooling channel is added to provide forced air cooling to the inner wall of the spiral body, and the cooling intensity is dynamically adjusted by a variable frequency suction fan; the synergistic effect of liquid cooling and air cooling not only enhances the overall thermal management capability, but also avoids the risk of oil leakage, thermal contact failure and high maintenance costs caused by the oil circuit system, and significantly improves the safety, reliability and service life of the mold operation. Attached Figure Description Figure 1 This is a cross-sectional view of the pipe extrusion die of this utility model; Figure 2 This is a cross-sectional schematic diagram of the spiral outer sheath of this utility model; Figure 3 This is a cross-sectional schematic diagram of the spiral body of this utility model; Figure 4 This is an unfolded diagram of the oil passage of the cooling channel of this utility model; Figure 5 This is a cross-sectional schematic diagram of a blind-hole spiral in the prior art.

[0020] In the diagram, 100 is the spiral body; 110 is the outer jacket of the spiral body; 120 is the spiral flow channel; 130 is the cooling flow channel; 131 is the oblique hole; 132 is the plug; 140 is the manifold; 141 is the connector; 150 is the air inlet pipe; 151 is the in-mold air cooling channel; and 160 is the circumferential exhaust pipe. Detailed Implementation The following are specific embodiments of the present invention, which are described in conjunction with the accompanying drawings. The technical methods of the present invention will be further described, but the present invention is not limited to these embodiments.

[0021] like Figures 1-5As shown, this utility model provides a cooling structure for a spiral assembly, comprising: The spiral body 100 and the spiral body jacket 110 together form the spiral body 100 assembly and form a spiral flow channel 120 between them. The feed end of the spiral body assembly is located at the inlet of the spiral flow channel 120. Multiple sets of cooling channels distributed in the circumferential direction are provided on the feed end face of the spiral body 100 and / or the spiral body jacket 110, and each cooling channel 130 is set independently to each other. The cooling channel 130 is located at the two ends of the feed end face of the spiral body 100 and / or the spiral body jacket 110, which are the cooling medium inlet and the cooling medium outlet, respectively; Each cooling channel 130 consists of at least two inclined holes 131 connected end to end, wherein the opening located between the cooling medium inlet and the cooling medium outlet on the feed end face of the spiral body 100 and / or the spiral body jacket 110 is sealed by a plug 132.

[0022] Because the spiral assembly adopts a non-central feeding method, the feeding end face of the spiral assembly has enough solid area to process the cooling channel 130. By drilling multiple inclined holes 131 with a certain angle on the end face and selectively sealing them, the cooling medium can flow in a meandering manner along a preset path inside the end face, thereby achieving effective cooling of the circumferential area of ​​the spiral 100 assembly.

[0023] This cooling structure avoids the heat conduction failure problem caused by thermal deformation in traditional built-in oil cooling systems, improving cooling efficiency and temperature uniformity. On the other hand, it eliminates the risk of oil leakage from oil line joints and seals, significantly improving the safety and reliability of equipment operation. At the same time, it simplifies the assembly structure and reduces manufacturing and maintenance costs.

[0024] Preferably, when both the spiral body 100 and the spiral body outer sleeve 110 are provided with cooling channels 130, the cooling channels 130 of the two are staggered, that is, the cooling channels 130 on the spiral body 100 are not in the same radial or angular position as the corresponding cooling channels 130 on the spiral body outer sleeve 110, but are distributed at a certain angle offset along the circumferential direction.

[0025] The staggered cooling channel 130 makes the cooling effect more uniform and continuous in the circumferential direction of the entire spiral 100 assembly, improves the overall temperature field balance, helps to improve melt flow stability and tube forming quality, and further enhances the structural reliability and service life of the assembly under high temperature and high pressure conditions.

[0026] Preferably, each cooling channel 130 is connected to an external mold temperature controller to form an independent cooling medium circulation channel. The mold temperature controller is connected to the control system. By configuring an independent mold temperature controller for each circumferentially distributed cooling channel 130, the cooling parameters (such as medium temperature and flow rate) of different circumferential areas of the spiral 100 component can be individually controlled. The control system dynamically adjusts the working status of each mold temperature controller according to process requirements or real-time feedback signals, thereby accurately matching local heat load changes.

[0027] This design enables zoned, independent, and dynamic control of the circumferential temperature field of the spiral 100 components, significantly improving the temperature uniformity and response accuracy of the mold. It effectively suppresses melt flow fluctuations, pipe wall thickness deviations, or surface defects caused by local overheating or uneven cooling. At the same time, it adjusts the cooling intensity of each area as needed, avoiding energy waste caused by overall overcooling and improving system energy efficiency and production stability.

[0028] Preferably, a number of thermocouples are provided on the inner wall of the spiral 100 and / or the outer wall of the spiral jacket 110. Local temperature data is collected through the thermocouples, and the thermocouples are connected to the control system. Based on the temperature signals fed back by each thermocouple, the control system links the corresponding mold temperature controller to dynamically adjust the flow rate and set temperature of the medium in the cooling channel 130 of that area, thereby realizing closed-loop temperature control.

[0029] Preferably, both the spiral body 100 and the spiral body jacket 110 are arranged in a ring structure, that is, the entire spiral body 100 assembly is a coaxial ring structure. The thermocouples are evenly arranged on the inner wall surface of the spiral body 100 and the outer wall surface of the spiral body jacket 110 along the circumferential direction, which can fully cover all key areas in the circumferential direction, and truly reflect the temperature state of the melt at different angle positions when it flows through the spiral channel 120, providing the control system with temperature field information with higher spatial resolution.

[0030] The circumferentially evenly distributed thermocouples are highly matched with the ring structure, ensuring the symmetry and representativeness of temperature monitoring, avoiding local blind spots, and making cooling control more in line with the actual heat load distribution; combined with the partitioned independent cooling channels 130, highly balanced control of circumferential temperature can be achieved, further improving the dimensional accuracy and surface quality of the products.

[0031] This utility model also provides a pipe extrusion die, comprising: The cooling structure of the aforementioned spiral assembly; The manifold 140 and the connector 141 are connected. The feed end of the manifold 140 is connected to an external screw extruder, and the discharge end of the manifold 140 is connected to the screw 100 assembly through the connector 141. The connector 141 is connected to the mating surface of the screw 100 and the screw outer sleeve 110.

[0032] It should be noted that, due to the structural design of the flow divider 140 and the connector 141, the molten material is not fed directly from the central axis of the spiral 100. Instead, it is distributed laterally by the flow divider 140 and then fed directly from the melt flow channel inlet end between the spiral 100 and the spiral outer sleeve 110 through the connector 141, thus forming a non-central feeding structure for the entire spiral 100 assembly.

[0033] In this configuration, the spiral channel 120 extends forward spirally along the length (axial direction) of the spiral body 100 assembly, and the feed end face is no longer occupied by the central feed hole, thus preserving a complete solid metal area. This solid area provides the necessary structural space and process feasibility for directly machining the cooling channel 130 on the end face.

[0034] In other words, this non-central feeding structure from This invention fundamentally breaks through the limitation that the traditional blind hole center feed spiral 100 cannot accommodate an internal cooling channel 130, allowing the cooling channel 130 to be directly integrated into the feed end face of the spiral 100 and / or the spiral outer sleeve 110 without relying on a built-in oil cooling device. This not only significantly improves cooling efficiency and temperature control accuracy, but also avoids problems such as oil leakage risk, thermal contact failure, and high energy consumption. At the same time, it simplifies the mold structure and improves assembly reliability and long-term operational stability.

[0035] Preferably, the feed end of the manifold 140 is located at the center of its feed end face, and its discharge end is circumferentially distributed on the outer side of its discharge end face and communicates with the connector 141. The manifold 140 adopts a design of central feed and circumferential discharge. After the molten material enters the manifold 140 from the screw extruder through the central hole, it is evenly distributed to multiple circumferential outlets on the outer edge of the discharge end face through the internal flow channel, and then introduced into the starting spiral flow channel 120 of the spiral body 100 assembly through the connector 141.

[0036] This structure allows the material to undergo preliminary circumferential homogenization before entering the spiral 100, laying the foundation for stable flow distribution within the subsequent spiral channel 120. It also significantly frees up space at the feed end of the spiral 100, enabling it to meet the structural requirements for opening the cooling channel 130.

[0037] Preferably, a central through hole is formed in the middle of the spiral body 100 assembly, and an air inlet pipe 150 is arranged in the central through hole. An in-mold air-cooling channel 151 is formed between the air inlet pipe 150 and the inner wall of the spiral body 100. At the same time, a circumferential exhaust pipe 160 is provided at the end of the central through hole of the spiral body 100. One end of the circumferential exhaust pipe 160 is connected to the in-mold air-cooling channel 151, and the other end is connected to an external variable frequency suction fan.

[0038] By setting up the circumferential exhaust pipe 160 and the in-mold air-cooling channel 151, the inner wall surface of the spiral 100 can be further cooled. Through the dynamic control of the variable frequency fan, the cooling intensity can be flexibly adjusted according to the actual working conditions, ensuring the thermal stability of the mold while avoiding excessive cooling.

[0039] This design works in conjunction with the liquid cooling system of the Helical 100 assembly to further enhance the thermal management performance and long-term operational reliability of the Helical 100 assembly.

[0040] The technical means disclosed in this utility model are not limited to those described above, but also include technical solutions composed of any combination of the above technical features. The above are specific embodiments of this utility model. It should be noted that those skilled in the art can make various improvements and modifications without departing from the principle of this utility model, and these improvements and modifications are also considered within the scope of protection of this utility model.

[0041] It should be noted that all directional indicators (such as up, down, left, right, front, back, etc.) in this utility model embodiment are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicator will also change accordingly.

[0042] Furthermore, in this utility model, the use of terms such as "first," "second," and "a" is for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this utility model, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified. The terms "connection," "fixed," etc., should be interpreted broadly. For example, "fixed" can mean a fixed connection, a detachable connection, or an integral part; it can mean a mechanical connection or an electrical connection; it can mean a direct connection or an indirect connection through an intermediate medium; it can mean the internal communication of two elements or the interaction between two elements, unless otherwise explicitly specified. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0043] The technical solutions of the various embodiments of this utility model can be combined with each other, but only if they can be implemented by those skilled in the art. When the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such combination of technical solutions does not exist and is not within the protection scope claimed by this utility model.

[0044] The specific embodiments described herein are merely illustrative examples illustrating the spirit of this utility model. Those skilled in the art to which this utility model pertains may make various modifications or additions to the described specific embodiments or use similar methods to substitute them, without departing from the spirit of this utility model or exceeding the scope defined by the appended claims.

Claims

1. A cooling structure for a spiral assembly, characterized in that, include: The spiral body and the spiral body jacket together form a spiral assembly and a spiral flow channel is formed between them. The feed end of the spiral assembly is located at the inlet of the spiral flow channel. The spiral body and / or the spiral body jacket have multiple sets of cooling channels distributed in the circumferential direction on the feed end face, and each cooling channel is set independently to each other. The cooling channel is located at the two ends of the spiral body and / or the feed end face of the spiral body jacket, which are the cooling medium inlet and the cooling medium outlet, respectively. Each set of cooling channels consists of at least two oblique holes connected end to end, wherein the opening between the cooling medium inlet and the cooling medium outlet on the feed end face of the spiral body and / or the spiral body outer sleeve is sealed by a plug.

2. The cooling structure for a spiral assembly according to claim 1, characterized in that, When both the spiral body and the spiral body jacket are provided with cooling channels, the cooling channels of the two are staggered.

3. The cooling structure for a spiral assembly according to claim 1, characterized in that, Each cooling channel is connected to an external mold temperature controller to form an independent cooling medium circulation channel. The mold temperature controller is connected to the control system.

4. The cooling structure for a spiral assembly according to claim 3, characterized in that, The inner wall of the spiral and / or the outer wall of the spiral sheath are respectively provided with a plurality of thermocouples, and the thermocouples are connected to the control system signal.

5. The cooling structure for a spiral assembly according to claim 4, characterized in that, The control system adjusts the circulation flow rate and temperature of the corresponding cooling channel based on the temperature detected by the thermocouple.

6. The cooling structure for a spiral assembly according to claim 4, characterized in that, Both the spiral and the spiral sheath are arranged in a ring structure, and the thermocouples are distributed circumferentially on the inner wall of the spiral and the outer wall of the spiral sheath.

7. A pipe extrusion die, characterized in that, include: Cooling structure of the spiral assembly as described in any one of claims 1-6 above; The manifold and the connector are connected as follows: the feed end of the manifold is connected to an external screw extruder, and the discharge end of the manifold is connected to the auger assembly through the connector, which is connected to the mating surface between the auger and the auger jacket.

8. A pipe extrusion die according to claim 7, characterized in that, The feed end of the diverter plate is located at the center of its feed end face, and its discharge end is circumferentially distributed on the outside of its discharge end face and communicates with the connector.

9. A pipe extrusion die according to claim 7, characterized in that, A central through hole is formed in the middle of the spiral assembly, and an air inlet pipe is arranged in the central through hole. An in-mold air cooling channel is formed between the air inlet pipe and the inner wall of the spiral.

10. A pipe extrusion die according to claim 9, characterized in that, The spiral body is provided with a circumferential exhaust pipe at the end of the central through hole. One end of the circumferential exhaust pipe is connected to the in-mold air-cooling channel, and the other end is connected to an external variable frequency suction fan.

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