High-precision plastic mold with good cooling effect

Abstract

The utility model belongs to plastic mould technical field especially relates to a high -precision plastic mould of good cooling effect, including lower mould, the upper side fixed mounting of lower mould has a plurality of positioning column, the surface sliding installation of a plurality of positioning column has same upper die, the downside of lower mould is equipped with the annular groove, the liquid cooling unit is fixedly installed in annular groove, and the liquid cooling unit includes the heat exchange filling layer, the heat exchange filling layer fixed mounting is in annular groove, this high -precision plastic mould of good cooling effect, through the injection of liquid plastic raw materials through injection molding mouth, at this time, the circulating water is accessed to the heat exchange pipe, and after circulating through the heat exchange pipe, the heat exchange filling layer is used for heat transfer to the liquid plastic raw material in the lower mould, absorbs its heat to the heat exchange pipe and rapidly takes away, the lower mould and the liquid plastic in the lower mould are cooled quickly, and the molding is accelerated, avoids the situation that the air cooling leads to low cooling efficiency and uneven cooling.

Description

Technical Field

[0001] This utility model belongs to the field of plastic mold technology, and in particular relates to a high-precision plastic mold with good cooling effect. Background Technology

[0002] Plastic molds are combination molds used for compression molding, extrusion molding, injection molding, blow molding, and low-foaming molding. They are key tools in industrial production for manufacturing plastic products.

[0003] Chinese patent CN217943963U discloses a plastic mold with a cooling structure. An mounting plate is installed on the lower surface of the mold body, and bases are symmetrically arranged on the lower surface of the mounting plate. An air inlet and an air outlet are respectively opened on one side of the mounting plate from front to back. A fixing plate is snapped onto one side of the mold body, and a movable plate is provided on the upper surface of the fixing plate. A cooling fan is provided on the upper surface of the movable plate. The fixing plate is installed on one side of the mold body by inserting a locking pin into a slot. The movable plate moves on the upper surface of the fixing plate using an electric telescopic rod. A slider connected to the lower surface of the movable plate slides in a groove via a connecting rod, thus adjusting the position of the cooling fan for rapid cooling of the mold and easy unloading.

[0004] The aforementioned patent has the following problems: This patent has some drawbacks in its use. While the cooling gas can cool the bottom of the mold body, and the heat-conducting rods can conduct heat outwards through the heat sink, effectively improving cooling performance, in actual use, the air-cooled structure has low heat exchange efficiency, only dissipating heat to the mold surface in a short time, and the heat dissipation is not uniform. Therefore, we propose a high-precision plastic mold with better cooling performance. Utility Model Content

[0005] The purpose of this invention is to provide a high-precision plastic mold with good cooling effect to solve the problems mentioned in the background art.

[0006] In view of this, the present invention provides a high-precision plastic mold with good cooling effect, including a lower mold, a plurality of positioning posts are fixedly installed on the upper side of the lower mold, the same upper mold is slidably installed on the surface of the plurality of positioning posts, and an annular groove is opened on the lower side of the lower mold, and a liquid cooling unit is fixedly installed in the annular groove. The liquid cooling unit includes a heat exchange filling layer, which is fixedly installed in an annular groove. A heat exchange tube is fixedly installed on the surface of the heat exchange filling layer. The heat exchange tube is wound in an annular shape around the surface of the heat exchange filling layer. Both ends of the heat exchange tube extend to one side of the lower mold. The inner bottom wall of the lower mold has multiple secondary grooves. A secondary ejection module is slidably installed in the secondary grooves. The inner bottom wall of the lower mold has multiple main grooves. A main ejection module is slidably installed on the inner wall of the main grooves. An ejection unit is fixedly installed on the lower side of the lower mold.

[0007] In this technical solution, multiple positioning pins are fixedly installed on the upper side of the lower mold. The same upper mold is slidably mounted on the surfaces of these positioning pins, enabling the mold to open and close. A heat exchange filling layer fills the annular groove on the side near the injection direction of the lower mold. Heat exchange tubes are arranged in a ring-like spiral on the heat exchange filling layer, with both ends extending to one side of the lower mold for connection to an external circulation system. Furthermore, the inner bottom wall of the lower mold has multiple secondary grooves and one main groove. The four secondary grooves are respectively installed at the four corners of the inner bottom wall of the lower mold, while the main groove is located at the center for ejecting the molded product. After mold closing, molten plastic is injected into the cavity through the injection port of the upper mold. At this time, external circulating coolant enters the heat exchange tubes. The heat from the plastic is conducted through the metal wall of the lower mold to the heat exchange filling layer, and then efficiently transferred to the coolant in the heat exchange tubes and rapidly carried away. The coolant continuously circulates, achieving uniform and efficient cooling of the mold cavity, accelerating plastic solidification and molding. Using liquid cooling, the heat exchange efficiency is far higher than that of air cooling. The annular heat exchange tubes, combined with a high thermal conductivity filler layer, ensure that heat can be quickly and evenly removed from the mold, significantly shortening the cooling time and improving production efficiency.

[0008] In the above technical solution, the ejection unit further includes a base, which is fixedly installed on the lower side of the lower mold. A base plate is slidably installed on the inner wall of the base. A plurality of secondary ejector rods are fixedly installed on the upper side of the base plate. The top ends of the plurality of secondary ejector rods pass through the lower side of the lower mold and are fixedly connected to the lower side of the corresponding secondary ejection module. A main ejector rod is fixedly installed on the upper side of the base plate. The top end of the main ejector rod passes through the lower side of the lower mold and is fixedly connected to the lower side of the main ejection module.

[0009] In this technical solution, when the product needs to be ejected, the base plate is pushed upward. The base plate synchronously drives all secondary ejector pins and the main ejector pin to rise together. The secondary ejector pins lift the secondary ejector modules distributed around the cavity, and the main ejector pins lift the main ejector module located in the center of the cavity, thereby realizing the smooth and synchronous ejection of the product from the mold cavity. By driving all ejector pins to move synchronously through a base plate, it is ensured that the force on all parts of the product is uniform, avoiding product deformation or damage caused by asynchronous ejection.

[0010] In the above technical solution, the pop-out unit further includes a secondary mounting block fixedly installed on the inner bottom wall of the base. A pull rod is slidably installed on the secondary mounting block. One end of the pull rod extends to the outside of one side of the base. A primary mounting block is fixedly installed on the surface of the pull rod. A top block is fixedly installed on the upper side of the primary mounting block. A guide block is fixedly installed on the lower side of the base plate. The top block and the guide block are in contact.

[0011] In this technical solution, the operator pulls the lever outward. The lever causes the first-stage mounting block and the top block to move horizontally. Since the top block and the guide block fixed on the base plate are in inclined contact, the horizontal movement of the top block is converted into a vertical upward thrust on the guide block through the inclined plane, thereby pushing the entire base plate upward and realizing the ejection function. The manual horizontal pulling force is converted into a vertical ejection force through the inclined plane mechanism, which saves effort and makes the operation easier.

[0012] In the above technical solution, a return spring is further provided on the surface of the pull rod, the return spring is located between the primary mounting block and the secondary mounting block, and a limit ring is fixedly installed at one end of the pull rod.

[0013] In this technical solution, when the operator releases the pulled rod, the compressed return spring releases its elasticity, pushing the primary mounting block along with the pull rod into the base until the limit ring abuts. This reverse movement, through the inclined surfaces of the top block and guide block, causes the base plate to descend, thereby resetting all main and auxiliary ejection modules to their initial positions, preparing for the next injection cycle. This eliminates the need for manual resetting, improving operational efficiency and ensuring the ejection system is in the correct initial position before each mold closing.

[0014] In the above technical solution, further, a plurality of connecting parts are fixedly installed on the upper side of the upper mold, and an injection port is opened on the upper side of the upper mold and extends to the space between the upper mold and the lower mold.

[0015] In this technical solution, the connector facilitates the installation and fixation of the mold on the injection molding machine. During injection, the injection molding machine's nozzle is aligned with the injection port, injecting molten plastic into the mold cavity. The connector ensures that the upper mold can be reliably connected to and move with the injection molding machine, achieving precise mold opening and closing actions.

[0016] In the above technical solution, the upper side of the top block and the surface of the guide block are both set as semi-circular to facilitate their compression and guidance.

[0017] In this technical solution, the contact surface between the top block and the guide block has been optimized. The upper side of the top block and the surface of the guide block are both set as semi-circular. When the top block moves horizontally and presses against the guide block, the contact point will transition smoothly, reducing friction and jamming during movement and making the force conversion smoother.

[0018] In the above technical solution, the material of the heat exchange filling layer is graphene.

[0019] In this technical solution, the graphene filling layer is filled in the annular groove, tightly wrapping the heat exchange tube and closely adhering to the substrate of the lower mold. The heat from the mold is conducted through the lower mold substrate to the graphene layer, which has an extremely high thermal conductivity, and then rapidly transferred to the coolant in the heat exchange tube with almost no loss, thereby carrying away the heat for heat dissipation. Graphene is one of the materials with the highest known thermal conductivity, which can greatly improve the heat transfer efficiency from the mold to the coolant and significantly improve the cooling effect.

[0020] The beneficial effects of this utility model are: 1. This high-precision plastic mold with good cooling effect injects liquid plastic raw material through the injection port. At this time, circulating water is connected to the heat exchange tube and circulates through the heat exchange tube and then through the heat exchange filling layer to transfer heat to the liquid plastic raw material in the lower mold. It absorbs the heat to the heat exchange tube and quickly carries it away, which rapidly cools the lower mold and the liquid plastic in the lower mold, accelerates its molding, and avoids the low cooling efficiency and uneven cooling caused by using air cooling.

[0021] 2. This high-precision plastic mold with good cooling effect allows the upper mold to separate from the lower mold after the plastic is formed. At this time, pulling the pull rod by hand moves the first-stage mounting block, which in turn moves the top block. The top block presses against the guide block and moves the bottom plate upward. The bottom plate then moves multiple secondary ejector rods and a main ejector rod upward synchronously. The secondary ejector rods then lift the corresponding secondary ejector modules from the four corners of the bottom wall of the lower mold. The main ejector module is located at the center of the bottom wall and lifts the solidified plastic product out, making it easy to handle manually and improving the processing speed. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the overall structure of this utility model; Figure 2 This is a cross-sectional view of the upper and lower molds in this utility model. Figure 3 This is a schematic diagram of the liquid cooling unit in this utility model; Figure 4 This is a cross-sectional structural diagram of the present invention.

[0023] The markings in the diagram are as follows: 1. Lower mold; 2. Positioning pin; 3. Upper mold; 4. Base; 5. Secondary ejector pin; 6. Secondary ejector module; 7. Base plate; 8. Main ejector module; 9. Main ejector pin; 10. Guide block; 11. Ejector block; 12. Primary mounting block; 13. Secondary mounting block; 14. Tie rod; 15. Limiting ring; 16. Heat exchanger tube; 17. Connecting piece; 18. Injection port; 19. Heat exchanger filling layer; 20. Return spring. Detailed Implementation

[0024] The following is in conjunction with the appendix Figures 1-4 This application will be described in further detail.

[0025] In this application, the terms "upper," "lower," "left," "right," "front," "rear," "top," "bottom," "inner," "outer," "middle," "vertical," and "horizontal," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. These terms are primarily for the purpose of better describing this application and its embodiments, and are not intended to limit the indicated device, element, or component to having a specific orientation, or to be constructed and operated in a specific orientation.

[0026] Example 1: This example provides a high-precision plastic mold with good cooling effect, including a lower mold 1, a plurality of positioning pins 2 are fixedly installed on the upper side of the lower mold 1, the same upper mold 3 is slidably installed on the surface of the plurality of positioning pins 2, and an annular groove is opened on the lower side of the lower mold 1, and a liquid cooling unit is fixedly installed in the annular groove. The liquid cooling unit includes a heat exchange filling layer 19, which is fixedly installed in an annular groove. A heat exchange tube 16 is fixedly installed on the surface of the heat exchange filling layer 19. The heat exchange tube 16 is wound in an annular shape around the surface of the heat exchange filling layer 19. Both ends of the heat exchange tube 16 extend to one side of the lower mold 1. The inner bottom wall of the lower mold 1 has multiple secondary grooves. A secondary ejection module 6 is slidably installed in the secondary grooves. The inner bottom wall of the lower mold 1 has multiple main grooves. A main ejection module 8 is slidably installed on the inner wall of the main grooves. An ejection unit is fixedly installed on the lower side of the lower mold 1.

[0027] Multiple positioning pins 2 are fixedly installed on the upper side of the lower mold 1. The same upper mold 3 is slidably mounted on the surfaces of the multiple positioning pins 2, enabling the mold to open and close. A heat exchange filling layer 19 fills the annular groove on the side near the injection direction of the lower mold 1. Heat exchange pipes 16 are arranged in a ring around the heat exchange filling layer 19, with both ends extending to one side of the lower mold 1 for connection to an external circulation system. Furthermore, the inner bottom wall of the lower mold 1 has multiple secondary grooves and one main groove. The four secondary grooves are respectively installed at the four corners of the inner bottom wall of the lower mold 1, while the main groove is located at the center for ejecting the molded product. After mold closing, molten plastic is injected into the cavity through the injection port 18 of the upper mold 3. At this time, external circulating coolant enters the heat exchange pipes 16. The heat from the plastic is conducted through the metal wall of the lower mold 1 to the heat exchange filling layer 19, and then efficiently transferred to the coolant in the heat exchange pipes 16 and rapidly carried away. The coolant continuously circulates, achieving uniform and efficient cooling of the mold cavity, accelerating plastic solidification and molding. Using liquid cooling, the heat exchange efficiency is far higher than that of air cooling. The annular heat exchange tubes 16, combined with a high thermal conductivity filler layer, ensure that heat can be quickly and evenly removed from the mold, significantly shortening the cooling time and improving production efficiency.

[0028] Example 2: This example provides a high-precision plastic mold with good cooling effect. In addition to the technical solution of the above example, it also has the following technical features: the ejection unit includes a base 4, which is fixedly installed on the lower side of the lower mold 1. A base plate 7 is slidably installed on the inner wall of the base 4. Multiple secondary ejector rods 5 are fixedly installed on the upper side of the base plate 7. The top ends of the multiple secondary ejector rods 5 pass through the lower side of the lower mold 1 and are fixedly connected to the lower side of the corresponding secondary ejection module 6. A main ejector rod 9 is fixedly installed on the upper side of the base plate 7. The top end of the main ejector rod 9 passes through the lower side of the lower mold 1 and is fixedly connected to the lower side of the main ejection module 8.

[0029] When the product needs to be ejected, the base plate 7 is pushed upward. The base plate 7 simultaneously drives all the secondary ejector pins 5 and the main ejector pin 9 to rise together. The secondary ejector pins 5 lift the secondary ejector modules 6 distributed around the cavity, and the main ejector pin 9 lifts the main ejector module 8 located in the center of the cavity, thereby realizing the smooth and synchronous ejection of the product from the mold cavity. By driving all the ejector pins to move synchronously through the base plate 7, it is ensured that the force on all parts of the product is uniform, avoiding product deformation or damage caused by asynchronous ejection.

[0030] Example 3: This example provides a high-precision plastic mold with good cooling effect. In addition to the technical solution of the above example, it also has the following technical features: the pop-out unit also includes a secondary mounting block 13 fixedly installed on the inner bottom wall of the base 4. A pull rod 14 is slidably installed on the secondary mounting block 13. One end of the pull rod 14 extends to the outside of one side of the base 4. A primary mounting block 12 is fixedly installed on the surface of the pull rod 14. A top block 11 is fixedly installed on the upper side of the primary mounting block 12. A guide block 10 is fixedly installed on the lower side of the base plate 7. The top block 11 and the guide block 10 are in contact.

[0031] The operator pulls the lever 14 outward. The lever 14 causes the first-stage mounting block 12 and the top block 11 to move horizontally. Since the top block 11 and the guide block 10 fixed on the base plate 7 are in inclined contact, the horizontal movement of the top block 11 is converted into a vertical upward thrust on the guide block 10 through the inclined plane, thereby pushing the entire base plate 7 upward and realizing the ejection function. The manual horizontal pulling force is converted into a vertical ejection force through the inclined plane mechanism, which saves effort and makes the operation easier.

[0032] Example 4: This example provides a high-precision plastic mold with good cooling effect. In addition to the technical solution of the above example, it also has the following technical features: a return spring 20 is sleeved on the surface of the pull rod 14. The return spring 20 is located between the first-stage mounting block 12 and the second-stage mounting block 13. A limit ring 15 is fixedly installed at one end of the pull rod 14.

[0033] When the operator releases the lever 14, the compressed return spring 20 releases its elasticity, pushing the primary mounting block 12, along with the lever 14, into the base 4 until the limit ring 15 abuts against it. This reverse movement, through the inclined surfaces of the top block 11 and the guide block 10, causes the base plate 7 to descend, thereby resetting all the main ejector modules 8 and auxiliary ejector modules to their initial positions, preparing for the next injection cycle. This eliminates the need for manual resetting, improving operational efficiency and ensuring the ejection system is in the correct initial position before each mold closing.

[0034] Example 5: This example provides a high-precision plastic mold with good cooling effect. In addition to the technical solution of the above example, it also has the following technical features: multiple connecting parts 17 are fixedly installed on the upper side of the upper mold 3, and an injection port 18 is opened on the upper side of the upper mold 3 and extends to the space between the upper mold 3 and the lower mold 1.

[0035] The connector 17 facilitates the installation and fixation of the mold on the injection molding machine. During injection, the injection nozzle of the injection molding machine is aligned with the injection port 18 to inject molten plastic into the mold cavity. The connector 17 ensures that the upper mold 3 can be reliably connected to the injection molding machine and move accordingly, achieving precise mold opening and closing actions.

[0036] Example 6: This example provides a high-precision plastic mold with good cooling effect. In addition to the technical solutions of the above examples, it also has the following technical features: the upper side of the top block 11 and the surface of the guide block 10 are both set as semi-arcs to facilitate extrusion guidance.

[0037] The contact surfaces between the top block 11 and the guide block 10 have been optimized. The upper side of the top block 11 and the surface of the guide block 10 are both set as semi-circular. When the top block 11 moves horizontally and presses the guide block 10, the contact point will transition smoothly, reducing friction and jamming during movement and making the force conversion smoother.

[0038] Example 7: This example provides a high-precision plastic mold with good cooling effect. In addition to the technical solutions of the above examples, it also has the following technical features: the material of the heat exchange filling layer 19 is graphene.

[0039] The graphene filling layer is embedded in the annular groove, tightly wrapping the heat exchange tube 16 and closely adhering to the substrate of the lower mold 1. Heat from the mold is conducted through the substrate of the lower mold 1 to the graphene layer, which has extremely high thermal conductivity, and then rapidly transferred to the coolant within the heat exchange tube 16 with almost no loss, thus dissipating heat. Graphene is one of the materials with the highest known thermal conductivity, which greatly improves the heat transfer efficiency from the mold to the coolant, significantly enhancing the cooling effect.

[0040] Working principle: When the device is in use, first place the base 4 on the mold machine, then fix the upper mold 3 to the lower pressing end of the mold machine through the connector 17, and then connect the heat exchange tube 16 of the lower mold 1 to the heat exchange circulating water to start use. In use, the mold machine first presses down the upper mold 3 to close the upper mold 3 and the lower mold 1. Then, the liquid plastic material is injected through the injection port 18. At this time, the circulating water is connected to the heat exchange tube 16 and circulates through the heat exchange tube 16 and then passes through the heat exchange filling layer 19 to transfer heat to the liquid plastic material in the lower mold 1. The heat is absorbed into the heat exchange tube 16 and quickly carried away, so as to quickly cool down the lower mold 1 and the liquid plastic in the lower mold 1 and accelerate its molding. After solidification, the upper mold 3 separates from the lower mold 1. At this time, the pull rod 14 is pulled by hand, which drives the first-level mounting block 12 to move. The first-level mounting block 12 drives the top block 11 to move. The top block 11 squeezes the guide block 10 and drives the bottom plate 7 to move upward. The bottom plate 7 drives multiple secondary ejector rods 5 and a main ejector rod 9 to move upward synchronously. The multiple secondary ejector rods 5 drive the corresponding secondary ejector modules 6 to be lifted from the four corners of the inner bottom wall of the lower mold 1. The main ejector module 8 is located at the center of the inner bottom wall and is lifted to eject the solidified plastic product for easy manual handling. After the retrieval is completed, the pull rod 14 is released. Under the reaction force of the return spring 20, the first-level mounting block 12 is reset, so that multiple secondary detachment modules 6 and one main detachment module 8 are reset. Then the above scheme is repeated for processing.

[0041] The embodiments of this application have been described above with reference to the accompanying drawings. Unless otherwise specified, the embodiments and features in the embodiments of this application can be combined with each other. This application is not limited to the specific embodiments described above. The specific embodiments described above are merely illustrative and not restrictive. Those skilled in the art can make many other forms under the guidance of this application without departing from the spirit and scope of the claims, and all of these forms are within the protection scope of this application.

Claims

1. A high-precision plastic mold with good cooling effect, characterized in that, include: The lower mold (1) has multiple positioning posts (2) fixedly installed on its upper side. The same upper mold (3) is slidably installed on the surface of the multiple positioning posts (2). An annular groove is opened on the lower side of the lower mold (1), and a liquid cooling unit is fixedly installed in the annular groove. The liquid cooling unit includes a heat exchange filling layer (19), which is fixedly installed in an annular groove. A heat exchange tube (16) is fixedly installed on the surface of the heat exchange filling layer (19). The heat exchange tube (16) is wound in an annular shape around the surface of the heat exchange filling layer (19). Both ends of the heat exchange tube (16) extend to one side of the lower mold (1). The inner bottom wall of the lower mold (1) is provided with multiple secondary grooves. A secondary ejection module (6) is slidably installed in the secondary grooves. The inner bottom wall of the lower mold (1) is provided with multiple main grooves. A main ejection module (8) is slidably installed on the inner wall of the main grooves. An ejection unit is fixedly installed on the lower side of the lower mold (1).

2. The high-precision plastic mold with good cooling effect according to claim 1, characterized in that, The pop-out unit includes a base (4), which is fixedly installed on the lower side of the lower mold (1). A base plate (7) is slidably installed on the inner wall of the base (4). Multiple secondary ejector rods (5) are fixedly installed on the upper side of the base plate (7). The top ends of the multiple secondary ejector rods (5) pass through the lower side of the lower mold (1) and are fixedly connected to the lower side of the corresponding secondary ejector module (6). A main ejector rod (9) is fixedly installed on the upper side of the base plate (7). The top end of the main ejector rod (9) passes through the lower side of the lower mold (1) and is fixedly connected to the lower side of the main ejector module (8).

3. A high-precision plastic mold with good cooling effect according to claim 2, characterized in that, The pop-up unit also includes a secondary mounting block (13) fixedly installed on the inner bottom wall of the base (4). A pull rod (14) is slidably installed on the secondary mounting block (13). One end of the pull rod (14) extends to the outside of one side of the base (4). A primary mounting block (12) is fixedly installed on the surface of the pull rod (14). A top block (11) is fixedly installed on the upper side of the primary mounting block (12). A guide block (10) is fixedly installed on the lower side of the base plate (7). The top block (11) and the guide block (10) are in contact.

4. A high-precision plastic mold with good cooling effect according to claim 3, characterized in that, A return spring (20) is sleeved on the surface of the pull rod (14). The return spring (20) is located between the first-level mounting block (12) and the second-level mounting block (13). A limit ring (15) is fixedly installed at one end of the pull rod (14).

5. A high-precision plastic mold with good cooling effect according to claim 1, characterized in that, Multiple connectors (17) are fixedly installed on the upper side of the upper mold (3), and an injection port (18) is opened on the upper side of the upper mold (3) and extends to the space between the upper mold (3) and the lower mold (1).

6. A high-precision plastic mold with good cooling effect according to claim 3, characterized in that, The upper side of the top block (11) and the surface of the guide block (10) are both set in a semi-circular shape to facilitate their compression and guidance.

7. A high-precision plastic mold with good cooling effect according to claim 1, characterized in that, The heat exchange filling layer (19) is made of graphene.

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