Cooling device for plastic mold

Abstract

The heat dissipation device comprises a movable mold, a mold cavity is formed in the middle of the movable mold, an injection molding opening is formed in the middle of the mold cavity, the interior of the movable mold communicates with a cooling pipeline, the injection molding opening communicates with a material injection pipe, and a telescopic pipeline is embedded in the injection molding opening; a closing mechanism is arranged at the end of the telescopic pipeline, a cooling cavity communicating with the cooling pipeline is formed in the movable mold, a driving mechanism for driving the closing mechanism to close and the telescopic pipeline to contract through liquid flow is arranged in the cooling cavity, and the driving mechanism comprises driving blades, a rotating ring, a driving plate and a driving rod. The cooling cavity is annular, the rotating ring is rotationally connected to the interior of the cooling cavity, the driving blades are fixedly connected to the outer end face of the rotating ring, and the device can effectively reduce material loss of an injection molding opening in the mold injection molding process.

Description

Technical Field

[0001] The invention relates to the technical field of injection mold equipment, and in particular to a heat dissipation device for a plastic mold. Background Art

[0002] Injection molding, also known as injection molding, is a molding method that combines injection and molding. The advantages of the injection molding method are fast production speed, high efficiency, automated operation, a wide variety of colors, shapes from simple to complex, sizes from large to small, and precise product size. The product is easy to update and can be made into parts with complex shapes. Injection molding is suitable for mass production and molding processing fields such as products with complex shapes. At a certain temperature, the completely molten plastic material is stirred by a screw, injected into the mold cavity with high pressure, and cooled and solidified to obtain a molded product. This method is suitable for mass production of parts with complex shapes and is one of the important processing methods.

[0003] Chinese patent publication CN114434738 A discloses an injection mold and a method for making the injection mold, belonging to the field of injection mold technology, including an upper mold base and a lower mold base, and the upper mold base and the lower mold base are arranged relatively, the bottom of the lower mold base is fixedly installed with a base, the inner cavity of the lower mold base is movably installed with an ejector assembly mechanism, and the top of the ejector assembly mechanism is movably installed with a filling mechanism. In the present invention, the outer abutment block of the second assembly block can use its own elastic force to support the inner cavity of the second assembly groove after abutting, and the modular assembly of the ejector body is realized through the ejector seat. At the same time, the relative axial position of the ejector body at the top of the ejector seat can be quickly adjusted in cooperation with the second assembly block on the bottom side, so as to meet the adjustment and adaptation of the ejection position of the injection mold core of different shapes, which is conducive to adapting to the injection molding of products of different specifications, and can effectively reduce the difficulty of replacement, adjustment and maintenance of the ejector of the injection mold, and meet the use needs.

[0004] During the cooling process, the injection mold has a high temperature at the injection port and is often equipped with a cooling circuit. However, the cooling circuit will also cause the material in the injection port to cool rapidly, resulting in the formation of conical residual material at the injection port of the plastic part, which reduces the material utilization rate and also requires subsequent secondary processing at the injection port of the plastic part.

[0005] Therefore, it is necessary to provide a heat dissipation device for a plastic mold to solve the above technical problems. Summary of the invention

[0006] The object of the present invention is to provide a heat dissipation device for a plastic mold to solve the above technical problems.

[0007] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a heat dissipation device for a plastic mold, comprising a movable mold, a mold cavity is opened in the middle of the movable mold, an injection port is arranged in the middle of the mold cavity, a cooling pipeline is connected to the interior of the movable mold, the injection port is connected to an injection pipe, a telescopic pipeline is embedded in the interior of the injection port, a closing mechanism is arranged at the end of the telescopic pipeline, a cooling cavity connected to the cooling pipeline is opened in the interior of the movable mold, and a driving mechanism is arranged in the interior of the cooling cavity for driving the closing mechanism to close and the telescopic pipeline to contract through liquid flow.

[0008] As a further solution of the present invention, the driving mechanism includes a driving blade, a rotating ring, a driving plate and a driving rod. The cooling chamber is annular, the rotating ring is rotatably connected to the inside of the cooling chamber, the driving blade is fixedly connected to the outer end surface of the rotating ring, and the driving blade is in contact with the inner wall of the cooling chamber, the driving plate is fixedly connected to the inner wall of the rotating ring, the driving rod is rotatably arranged in the middle of the driving plate, and one end of the driving rod is in contact with the edge of the closing mechanism.

[0009] Furthermore, the cooling pipeline is divided into a liquid inlet pipe and a liquid outlet pipe, and the liquid inlet pipe and the liquid outlet pipe are distributed and connected to the cooling cavity in a convenient tangential direction. The inner wall of the cooling cavity may be arc-shaped, and the end of the arc-shaped portion is provided with an arc-shaped portion adapted to the inner wall of the cooling cavity. The rotating ring is rotatably embedded in the cooling cavity through a rotating bearing.

[0010] As a further solution of the present invention, the closing mechanism includes a sloped convex plate, a closing plate and a sloped concave portion. The closing plate is fan-shaped and is provided with multiple groups of symmetrically arranged at the end of the telescopic pipeline. The sloped concave portion is arranged on the side where the closing plate is in contact with the top of the telescopic pipeline. The sloped convex plate is fixedly connected to the end of the closing plate away from the sloped concave portion, and the side of the sloped convex plate away from the closing plate is in contact with the driving rod.

[0011] Furthermore, a plurality of sets of closing plates are spliced ​​together to form a circle, and the closing plates close the ends of the telescopic pipeline after being spliced ​​together.

[0012] As a further solution of the present invention, the telescopic pipeline includes a telescopic mechanism, an injection cavity, a limiting slide groove and an injection ring. The telescopic mechanism is composed of multiple groups of nested rings, and the multiple groups of nested rings are nested in each other. An injection ring is provided at the bottom of the telescopic mechanism, and the injection ring is connected to the injection pipe. The injection cavity is opened inside the telescopic mechanism and is connected to the injection port and the injection ring.

[0013] Furthermore, the diameters of the multiple groups of nested rings gradually decrease.

[0014] As a further solution of the present invention, a limiting sliding groove is provided on the top of the telescopic mechanism, and a second limiting sliding block matched with the limiting sliding groove is provided on the side where the closing plate and the telescopic pipeline are in contact.

[0015] As a further solution of the present invention, multiple groups of nested rings are spirally connected through arc grooves and first limit sliders, the arc grooves are opened on the inner walls of the nested rings, the first limit slider is fixedly connected to the outer end faces of the nested rings, and the limit slider is adapted to the arc grooves.

[0016] Furthermore, the arc groove of the nested ring is adapted to the first limit slider of the next set of nested rings.

[0017] As a further solution of the present invention, an electric heating mechanism is embedded in the inner wall of the injection ring.

[0018] When the present invention is used, a closed mold cavity is formed after the movable mold and the fixed mold are closed. The mold cavity is connected with the injection pipe through the injection port. After the raw material is heated and melted by the injection pipe and injected into the mold cavity, a cooling medium is injected through the cooling pipeline to cool and mold the plastic part in the mold cavity. During cooling, the injection of coolant will drive the driving mechanism to drive the closing mechanism to close the inner wall of the telescopic pipeline to cut off the residual raw material inside the injection port and the plastic part, and after cutting, the telescopic pipeline is driven to shrink to retract the residual material in the injection port into the inside of the injection pipe, thereby avoiding the residual material inside the injection port being cooled and molded together with the plastic part, thereby improving the raw material utilization rate. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The present invention is further described below in conjunction with the accompanying drawings and embodiments.

[0020] Figure 1 It is a schematic diagram of the structure of the present invention; Figure 2 It is a schematic diagram of the cross-sectional structure of the movable mold of the present invention; Figure 3 It is a schematic diagram of the driving mechanism structure of the present invention; Figure 4 It is a schematic diagram of the cooling chamber structure of the present invention; Figure 5 is a schematic diagram of the driving blade structure of the present invention; Figure 6 It is a schematic diagram of the closing mechanism structure of the present invention; Figure 7 It is a schematic diagram of the telescopic pipeline structure of the present invention; Figure 8 It is a schematic diagram of the internal structure of the telescopic pipeline of the present invention; Fig. 9 It is a schematic diagram of the structure of the telescopic pipeline of the present invention in a contracted state; Fig.10 It is a schematic diagram of the cross-sectional structure of the nested rings of the present invention.

[0021] In the figure: 1. movable mold; 2. mold cavity; 3. injection pipe; 4. cooling pipeline; 5. injection port; 6. closing mechanism; 7. telescopic pipeline; 8. driving mechanism; 9. cooling cavity; 10. driving blade; 11. rotating ring; 12. rotating bearing; 13. driving plate; 14. driving rod; 15. inclined convex plate; 16. closing plate; 17. inclined concave part; 18. arc-shaped part; 19. injection cavity; 20. limiting slide groove; 21. nesting ring; 22. injection ring; 23. electric heating mechanism; 24. arc-shaped groove; 25. first limiting slider; 26. second limiting slider. DETAILED DESCRIPTION

[0022] Embodiment 1 like Figure 1 - Figure 2 As shown, a heat dissipation device for a plastic mold includes a movable mold 1, a mold cavity 2 is opened in the middle of the movable mold 1, an injection port 5 is arranged in the middle of the mold cavity 2, a cooling pipeline 4 is connected to the interior of the movable mold 1, the injection port 5 is connected to the injection pipe 3, a telescopic pipeline 7 is embedded in the injection port 5, a closing mechanism 6 is arranged at the end of the telescopic pipeline 7, a cooling cavity 9 connected to the cooling pipeline 4 is opened in the movable mold 1, and a driving mechanism 8 is arranged in the cooling cavity 9 for driving the closing mechanism 6 to close and the telescopic pipeline 7 to contract by liquid flow.

[0023] When in use, the movable mold 1 and the fixed mold are combined to form a closed mold cavity 2, and the mold cavity 2 is connected with the injection pipe 3 through the injection port 5. After the raw material is heated and melted by the injection pipe 3, it is injected into the mold cavity 2, and then the cooling medium is injected through the cooling pipe 4 to cool and mold the plastic part in the mold cavity 2. During cooling, the injection of coolant will drive the driving mechanism 8 to drive the closing mechanism 6 to close the inner wall of the telescopic pipe 7 to cut off the residual raw material inside the injection port 5 from the plastic part, and after cutting, the telescopic pipe 7 is driven to shrink to retract the residual material in the injection port 5 into the injection pipe 3, thereby avoiding the residual material inside the injection port 5 from being cooled and molded together with the plastic part, thereby improving the raw material utilization rate.

[0024] Embodiment 2 Based on the first embodiment, Figure 1 - Figure 5 As shown, the driving mechanism 8 includes a driving blade 10, a rotating ring 11, a driving plate 13 and a driving rod 14. The cooling chamber 9 is annular. The rotating ring 11 is rotatably connected to the inside of the cooling chamber 9. The driving blade 10 is fixedly connected to the outer end surface of the rotating ring 11, and the driving blade 10 is in contact with the inner wall of the cooling chamber 9. The driving plate 13 is fixedly connected to the inner wall of the rotating ring 11. The driving rod 14 is rotatably arranged in the middle of the driving plate 13, and one end of the driving rod 14 is in contact with the edge of the closing mechanism 6.

[0025] Furthermore, the cooling pipeline 4 is divided into a liquid inlet pipe and a liquid outlet pipe, which are distributed and connected to the cooling chamber 9 in a convenient tangential direction. The inner wall of the cooling chamber 9 can be arc-shaped, and the end of the arc-shaped portion 18 is provided with an arc-shaped portion 18 that is adapted to the inner wall of the cooling chamber 9. The rotating ring 11 is rotatably embedded in the cooling chamber 9 through a rotating bearing 12.

[0026] When in use, coolant is injected into the interior of the cooling chamber 9 through the cooling pipeline 4. The cooling chamber 9 is arranged in a ring shape, so that the driving blade 10 is driven by the liquid flow to drive the rotation of the rotating ring 11, and then the driving plate 13 is driven by the rotating ring 11 to drive the driving rod 14 to move in a ring. One end of the driving rod 14 is in contact with the closing mechanism 6. The ring movement of the driving rod 14 drives the closing mechanism 6 to close, cut off the material at the end of the telescopic pipeline 7 and keep it in a closed state.

[0027] like Figure 1 - Figure 6 and Figure 8-9 As shown, the closing mechanism 6 includes an inclined convex plate 15, a closing plate 16 and an inclined concave portion 17. The closing plate 16 is fan-shaped, and the closing plate 16 is provided with a plurality of groups symmetrically arranged at the end of the telescopic pipe 7. The inclined concave portion 17 is arranged on the side where the closing plate 16 is in contact with the top of the telescopic pipe 7. The inclined convex plate 15 is fixedly connected to the end of the closing plate 16 away from the inclined concave portion 17, and the side of the inclined convex plate 15 away from the closing plate 16 is in contact with the driving rod 14.

[0028] Furthermore, a plurality of sets of closing plates 16 are spliced ​​together to form a circle, and the closing plates 16 are spliced ​​together to close the end of the telescopic pipe 7 .

[0029] When in use, the driving rod 14 rotates continuously under the drive of the rotating ring 11, and the driving rod 14 fits with the end of the inclined convex plate 15. As the driving rod 14 rotates, the inclined convex plate 15 will move relative to the center of the telescopic pipe 7. When multiple groups of inclined convex plates 15 fit together, the end of the telescopic pipe 7 can be closed and the residual material in the telescopic pipe 7 can be disconnected from the plastic part. A bevel recess 17 is provided on one side of the closing plate 16 to improve the cutting effect of the closing plate 16. When the cooling pipe 4 stops cooling, it only needs to re-inject material through the telescopic pipe 7. Under the squeezing action of the material on the bevel recess 17, the bevel recess 17 can be separated from each other, so that the closing plate 16 is opened, and then the telescopic pipe 7 is reconnected with the mold cavity 2 through the injection port 5.

[0030] like Figure 1 - Fig. 9 As shown, the telescopic pipeline 7 includes a telescopic mechanism, an injection cavity 19, a limiting slide groove 20 and an injection ring 22. The telescopic mechanism is composed of multiple groups of nested rings 21, and the multiple groups of nested rings 21 are nested in each other. An injection ring 22 is provided at the bottom of the telescopic mechanism, and the injection ring 22 is connected to the injection tube 3. The injection cavity 19 is opened inside the telescopic mechanism and is connected to the injection port 5 and the injection ring 22.

[0031] Furthermore, the diameters of the multiple sets of nested rings 21 gradually decrease.

[0032] When in use, multiple groups of nested rings 21 are nested in each other to form an injection cavity 19 with an inverted cone shape. The injection cavity 19 is connected to the injection port 5 to effectively improve the stability of the pressure during the injection process. After the injection is completed, the nested rings 21 can be extended and retracted to slide the nested rings 21 against each other, so that the volume of the injection cavity 19 between the nested rings 21 is reduced. At the same time, when the end of the telescopic pipeline 7 is closed by the closing mechanism 6, the residual material in the injection cavity 19 can flow back into the injection tube 3 through the injection ring 22.

[0033] like Figure 1 - Fig. 9 As shown, a limit slide groove 20 is provided on the top of the telescopic mechanism, and a second limit slider 26 adapted to the limit slide groove 20 is provided on the side where the closing plate 16 and the telescopic pipe 7 are in contact.

[0034] When in use, the closing plate 16 is limited by the second limiting slider 26 and the limiting groove 20 so that the closing plate 16 can only move linearly at the end of the telescopic pipe 7, and the closing plate 16 can be stably closed to the middle of the injection chamber 19 under the drive of the driving rod 14, and the driving rod 14 stops power after the cooling pipe 4 stops supplying liquid, and the closing plate 16 can also be opened to the edge under the push of the material.

[0035] like Figure 1 - Fig.10 As shown, multiple groups of nested rings 21 are spirally connected through arc grooves 24 and first limit sliders 25. The arc grooves 24 are opened on the inner walls of the nested rings 21. The first limit sliders 25 are fixedly connected to the outer end faces of the nested rings 21. The limit sliders 25 are adapted to the arc grooves 24.

[0036] Furthermore, the arc groove 24 of the nested ring 21 is adapted to the first limit slider 25 of the next set of nested rings 21 .

[0037] When in use, when the cooling pipeline 4 is driven by the liquid flow to drive the driving rod 14 to rotate and drive the closing plate 16 to move toward the middle of the injection chamber 19 to cut off the material at the end of the telescopic pipeline 7 and close it, the closing plate 16 cannot move. At this time, the driving rod 14 and the inclined convex plate 15 are still in abutment. At this time, the driving rod 14 continues to rotate, so that the driving rod 14 drives the closing plate 16 to rotate, and the closing plate 16 is limited by the second limiting slide block 26 and the limiting slide groove 20 and the top nesting ring 21, thereby driving the nesting ring 21 to rotate synchronously. Under the action of the arc groove 24 and the first limiting slide block 25, the driving rod 14 drives the nesting ring 21 to rotate and contract until the first limiting slide block 25 slides to the end of the arc groove 24, so that the rotational force can be transmitted to the uncontracted nested ring 21, thereby completing the contraction of all the nested rings 21, so that the device can drive the closing mechanism 6 to close through the liquid flow of the cooling pipeline 4, and at the same time, the telescopic pipeline 7 can complete the contraction to discharge the internal residual material into the injection pipe 3, and when the cooling pipeline 4 stops cooling, the driving rod 14 is driven to disconnect, and the injection pipe 3 is re-injected with material, the nested ring 21 will rotate and stretch again under the contact of the material to communicate with the injection port 5, and after stretching to the maximum, the closing plate 16 is opened under the action of the inclined concave portion 17, and injection molding can be carried out until the next start of the cooling pipeline 4.

[0038] like Figure 1 - Fig.10 As shown, an electric heating mechanism 23 is embedded in the inner wall of the injection ring 22 .

[0039] When in use, multiple groups of nested rings 21 make the injection cavity 19 conical, and the diameter of one end of the injection cavity 19 that fits the injection port 5 is larger than that of one end of the injection ring 22, so that the material in the injection cavity 19 cannot be directly discharged into the interior of the injection tube 3 through the contraction of the nested rings 21 in a cooling state. By providing an electric heating mechanism 23, the solid material in the injection cavity 19 can be heated by the electric heating mechanism 23 and then gradually flow back into the interior of the injection tube 3, thereby avoiding the solid material in the injection tube 3 from repeatedly entering the next injection molding process, thereby improving the injection molding quality of the product.

[0040] Working principle: After the movable mold 1 and the fixed mold are closed, a closed mold cavity 2 is formed. The mold cavity 2 is connected with the injection pipe 3 through the injection port 5. After the raw material is heated and melted by the injection pipe 3 and injected into the mold cavity 2, a cooling medium is injected through the cooling pipe 4 to cool and mold the plastic part in the mold cavity 2. During cooling, the injection of the coolant will drive the driving mechanism 8 to drive the closing mechanism 6 to close the inner wall of the telescopic pipe 7 to cut off the residual raw material in the injection port 5 from the plastic part, and after cutting, the telescopic pipe 7 is driven to shrink and retract the residual material in the injection port 5 into the injection pipe 3, thereby avoiding the residual material in the injection port 5 from being cooled and molded together with the plastic part, thereby improving the utilization rate of the raw materials. The coolant is injected into the cooling cavity 9 through the cooling pipe 4. The cooling cavity 9 is arranged in an annular shape, so that the liquid flow drives the driving mechanism 8 to drive the closing mechanism 6 to close the inner wall of the telescopic pipe 7 to cut off the residual raw material in the injection port 5 from the plastic part, and after cutting, the telescopic pipe 7 is driven to shrink and retract the residual material in the injection port 5 into the injection pipe 3, thereby avoiding the residual material in the injection port 5 from being cooled and molded together with the plastic part, thereby improving the utilization rate of the raw materials. The moving blade 10 drives the rotating ring 11 to rotate, and then the rotating ring 11 drives the driving plate 13 to drive the driving rod 14 to move in an annular manner. One end of the driving rod 14 is fitted with the closing mechanism 6. The annular movement of the driving rod 14 drives the closing mechanism 6 to close and cut off the material at the end of the telescopic pipe 7 and keep it in a closed state. The driving rod 14 is continuously rotated under the drive of the rotating ring 11, and the driving rod 14 is fitted with the end of the inclined convex plate 15. As the driving rod 14 rotates, the inclined convex plate 15 will move relative to the center of the telescopic pipe 7. When multiple groups of inclined convex plates 15 are fitted, the end of the telescopic pipe 7 can be closed and the residual material in the telescopic pipe 7 can be disconnected from the plastic part. A bevel recess 17 is provided on one side of the closing plate 16 to improve the cutting effect of the closing plate 16. When the cooling pipeline 4 stops cooling, it is only necessary to re-inject the material through the telescopic pipeline 7. Under the squeezing effect of the material on the inclined surface recess 17, the inclined surface recess 17 can be separated from each other, so that the closing plate 16 is opened, and then the telescopic pipeline 7 is re-connected with the mold cavity 2 through the injection port 5. Through multiple groups of nested rings 21, the mutually embedded grooves are formed to form an injection cavity 19 with an inverted cone. The injection cavity 19 is connected with the injection port 5 to effectively improve the stability of the pressure during the injection process. After the injection is completed, the nested rings 21 can be retracted and the nested rings 21 can be slid on each other, so that the volume of the injection cavity 19 between the nested rings 21 is reduced. At the same time, when the end of the telescopic pipeline 7 is closed by the closing mechanism 6, the residual material in the injection cavity 19 can be injected through the injection ring 22. The internal reflux of the injection pipe 3 is caused by the second limiting slider 26 and the limiting slot 20, so that the closing plate 16 can only move linearly at the end of the telescopic pipe 7, and the closing plate 16 can be stably closed to the middle of the injection chamber 19 under the drive of the driving rod 14, and the driving rod 14 stops the power after the cooling pipe 4 stops supplying liquid, and the closing plate 16 can also be opened to the edge under the push of the material. When the cooling pipe 4 drives the driving rod 14 to rotate and drive the closing plate 16 to move to the middle of the injection chamber 19 through the liquid flow, the material at the end of the telescopic pipe 7 is cut off and closed, and the closing plate 16 cannot move. At this time, the driving rod 14 and the inclined convex plate 15 are still in abutment. At this time, the driving rod 14 continues to rotate, so that the driving rod 14 drives the closing plate 16 to rotate.The closing plate 16 is limited by the second limiting slide block 26 and the limiting slide groove 20 and the top nesting ring 21, thereby driving the nesting ring 21 to rotate synchronously. Under the action of the arc groove 24 and the first limiting slide block 25, the driving rod 14 drives the nesting ring 21 to rotate and contract until the first limiting slide block 25 slides to the end of the arc groove 24, thereby transmitting the rotational force to the uncontracted nesting ring 21, thereby completing the contraction of all the nesting rings 21, so that the device can drive the closing mechanism 6 to close through the liquid flow of the cooling pipeline 4, and at the same time, the telescopic pipeline 7 can complete the contraction and discharge the residual material inside into the injection pipe 3. When the cooling pipeline 4 stops cooling, the driving rod 14 is driven to disconnect, and the injection pipe 3 is re-injected with material, when the material is close to the closing mechanism 6, the telescopic pipeline 7 can be closed. Under the condition that the nested ring 21 rotates and stretches again to communicate with the injection port 5, and after stretching to the maximum, the closing plate 16 is opened under the action of the inclined concave portion 17, and injection molding can be carried out until the next cooling pipeline 4 is started. Multiple sets of nested rings 21 make the injection cavity 19 conical, and the diameter of the injection cavity 19 that fits the injection port 5 is larger than that of the injection ring 22, so that the material in the injection cavity 19 cannot be directly discharged into the interior of the injection pipe 3 through the contraction of the nested ring 21 in the cooling state. By providing an electric heating mechanism 23, the solid material in the injection cavity 19 can be heated by the electric heating mechanism 23 and gradually flow back into the interior of the injection pipe 3, so as to avoid the solid material in the injection pipe 3 from repeatedly entering the next injection molding process, thereby improving the injection molding quality of the product.

Claims

1. A heat dissipation device for a plastic mold, comprising a movable mold, a mold cavity is provided in the middle of the movable mold, an injection port is provided in the middle of the mold cavity, a cooling pipeline is connected to the interior of the movable mold, and the injection port is connected to an injection pipe, characterized in that: A telescopic pipeline is embedded inside the injection port, a closing mechanism is provided at the end of the telescopic pipeline, a cooling cavity connected to the cooling pipeline is opened inside the movable mold, and a driving mechanism is provided inside the cooling cavity for driving the closing mechanism to close and the telescopic pipeline to contract through liquid flow.

2. A heat dissipation device for a plastic mold according to claim 1, characterized in that: The driving mechanism includes a driving blade, a rotating ring, a driving plate and a driving rod. The cooling cavity is annular. The rotating ring is rotatably connected to the inside of the cooling cavity. The driving blade is fixedly connected to the outer end surface of the rotating ring, and the driving blade is in contact with the inner wall of the cooling cavity. The driving plate is fixedly connected to the inner wall of the rotating ring. The driving rod is rotatably arranged in the middle of the driving plate, and one end of the driving rod is in contact with the edge of the closing mechanism.

3. A heat dissipation device for a plastic mold according to claim 2, characterized in that: The closing mechanism includes a sloped convex plate, a closing plate and a sloped concave portion. The closing plate is fan-shaped and is provided with multiple groups symmetrically arranged at the end of the telescopic pipeline. The sloped concave portion is arranged on the side where the closing plate is in contact with the top of the telescopic pipeline. The sloped convex plate is fixedly connected to the end of the closing plate away from the sloped concave portion, and the side of the sloped convex plate away from the closing plate is in contact with the driving rod.

4. A heat dissipation device for a plastic mold according to claim 3, characterized in that: The telescopic pipeline includes a telescopic mechanism, an injection cavity, a limiting slide groove and an injection ring. The telescopic mechanism is composed of multiple groups of nested rings, and the multiple groups of nested rings are nested in each other. An injection ring is provided at the bottom of the telescopic mechanism, and the injection ring is connected to the injection pipe. The injection cavity is opened inside the telescopic mechanism and is connected to the injection port and the injection ring.

5. A heat dissipation device for a plastic mold according to claim 4, characterized in that: A limiting sliding groove is arranged on the top of the telescopic mechanism, and a second limiting sliding block matched with the limiting sliding groove is arranged on the side where the closing plate is in contact with the telescopic pipeline.

6. A heat dissipation device for a plastic mold according to claim 5, characterized in that: The multiple groups of nested rings are spirally connected through arc grooves and first limit sliders. The arc grooves are opened on the inner walls of the nested rings. The first limit slider is fixedly connected to the outer end faces of the nested rings. The limit slider is adapted to the arc grooves.

7. A heat dissipation device for a plastic mold according to claim 6, characterized in that: An electric heating mechanism is embedded in the inner wall of the injection ring.

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