Injection mold capable of circularly cooling

Abstract

The utility model belongs to the technical field of injection molding, particularly relates to an injection mold capable of circularly cooling, and provides the following scheme aiming at the problems of uneven temperature, aggravated plastic part shrinkage and warping, insufficient heat dissipation structure efficiency, difficulty in continuous cooling and the like caused by a single cooling path of the traditional injection mold in the prior art: the injection mold comprises a lower mold and an upper mold, the upper mold is arranged above the lower mold, the upper mold and the lower mold are in sliding fit through a plurality of guide rods fixedly installed at the top of the lower mold, corresponding forming grooves are formed in the sides, close to each other, of the lower mold and the upper mold, and a material injection hole is formed in the upper mold in a penetrating mode. According to the injection mold, through the built-in first heat conduction pipe and the circulating cooling assembly, rapid and accurate temperature control of the mold can be achieved, and the product quality and the forming efficiency are remarkably improved; and by adopting a closed circulation design and a double-mold independent heat conduction structure, the upper mold and the lower mold can still maintain efficient heat dissipation in a mold splitting state, and the process continuity is guaranteed.

Description

Technical Field

[0001] This utility model relates to the field of injection molding technology, and in particular to an injection mold capable of cyclic cooling. Background Technology

[0002] In injection molding, mold temperature control has a crucial impact on product quality and production efficiency. Excessively high mold temperatures cause premature solidification of the material during molding, affecting the surface quality and dimensional accuracy of the product; conversely, excessively low mold temperatures can lead to poor material flowability and incomplete mold filling, also impacting product quality. However, existing injection molds still have the following problems in use:

[0003] Traditional injection mold cooling methods often use a single cooling channel or an integrated heat dissipation structure. Some single cooling paths can easily lead to uneven temperature distribution in the mold, which can cause problems such as fluctuations in the shrinkage rate of plastic parts and warping deformation. Especially for complex structural workpieces, uneven cooling can aggravate internal residual stress and reduce mechanical properties. In addition, some heat dissipation structures have poor independent working performance, making it difficult to continuously cool the mold, which is not conducive to the molding of the workpiece.

[0004] To address the aforementioned problems, this utility model document proposes an injection mold capable of cyclic cooling. Utility Model Content

[0005] The purpose of this invention is to address the shortcomings of existing technologies, such as the single cooling path of traditional injection molds leading to uneven temperature, exacerbating shrinkage and warping of plastic parts, insufficient heat dissipation efficiency, and difficulty in continuous cooling. This invention proposes an injection mold capable of cyclic cooling.

[0006] To achieve the above objectives, the present invention adopts the following technical solution:

[0007] An injection mold capable of cyclic cooling includes:

[0008] The upper mold and the lower mold are provided. The upper mold is slidably connected to the top of the lower mold via a guide rod. The opposing surfaces of the two molds are respectively provided with forming grooves. The upper mold is provided with an injection hole that communicates with the forming grooves.

[0009] Two serpentine first heat conduction pipes are respectively embedded in the lower mold and the upper mold and adjacent to the corresponding forming grooves, with both ends of the first heat conduction pipes extending to the outside of the mold;

[0010] A circulating cooling component includes a liquid storage tank, a heat sink, and a circulating pump. The outlet of the circulating pump is connected to the inlet of two first heat-conducting pipes via a liquid delivery pipe. The heat sink contains two second heat-conducting pipes. The outlet of the second heat-conducting pipes is connected to the liquid storage tank, and the inlet is connected to the outlet of the two first heat-conducting pipes. The heat sink is equipped with a cooling mechanism to accelerate the heat dissipation of the second heat-conducting pipes.

[0011] In this process, the coolant is pumped into the corresponding first heat pipe by the circulating pump to absorb the heat of the molding tank, then flows through the second heat pipe to dissipate heat and flows back to the storage tank, forming a closed-loop cooling cycle.

[0012] In one possible design, the cooling mechanism includes a fixed plate and a plurality of spaced-apart heat-conducting fins, with a second heat-conducting pipe passing through the plurality of heat-conducting fins, and two fans provided on the side of the fixed plate.

[0013] In one possible design, the heat sink is provided with a mounting shell on top, and multiple ventilation holes are opened on both sides of the mounting shell, through which the second heat pipe passes.

[0014] In one possible design, the infusion tube is connected to the inlet end of the first heat-conducting pipe in the lower mold via a branch pipe, and is connected to the inlet end of the first heat-conducting pipe in the upper mold via a first flexible pipe.

[0015] In one possible design, the second heat pipe includes two sets of pipes arranged vertically, with the lower pipe connected to the liquid outlet of the first heat pipe in the lower mold via a pipe, and the upper pipe connected to the liquid outlet of the first heat pipe in the upper mold via a second flexible pipe.

[0016] In one possible design, an ejection assembly is also included, comprising a movable plate slidably disposed within a movable cavity, the top of which is provided with multiple ejector rods penetrating the forming groove of the lower mold, and the bottom of which is connected to a movable frame with an inclined guide groove. A cylinder-driven T-shaped rod is slidably engaged with the guide groove to drive the ejector rods to rise and fall.

[0017] In one possible design, the liquid storage tank has a liquid filling pipe with an end cap on its side, and its bottom is fixedly connected to the lower mold via a mounting plate.

[0018] In one possible design, the contact surface between the heat-conducting fins and the second heat-conducting pipe is coated with a layer of thermally conductive silicone grease.

[0019] In one possible design, the inner wall of the movable cavity is provided with a sealing ring that mates with the edge of the moving plate, and the plurality of top rods slide through the inner walls of adjacent forming grooves in a sealed manner.

[0020] In this application, when the mold is closed, the upper and lower molds are slidably engaged by guide rods, and the material to be molded is injected into the molding groove through the injection hole. During the molding process, the circulation pump is started, and the coolant in the storage tank is delivered to the first heat-conducting pipe in the lower and upper molds through the delivery pipe and its branch pipes, respectively. When the coolant flows through the first heat-conducting pipe, it absorbs heat near the molding groove of the mold, and then enters the heat dissipation frame through the second flexible pipe and the second heat-conducting pipe.

[0021] Subsequently, the coolant flowing into the heat sink moves along the second heat pipe. Two fans activate and accelerate airflow across the heat-conducting fins, causing the heat from the coolant in the second heat pipe to dissipate rapidly through the fins. The cooled coolant then flows back to the reservoir via the second heat pipe, completing the cooling cycle. The mounting housing ensures unobstructed airflow through ventilation holes, improving heat dissipation efficiency. The serpentine design of the first and second heat pipes increases the contact area with the mold and heat-conducting fins, enhancing heat transfer efficiency.

[0022] After molding is complete, the cylinder drives the T-shaped rod to move horizontally. The T-shaped rod slides into the guide groove of the moving frame, forcing the moving frame and moving plate to rise vertically along the movable cavity. The ejector rod then extends out of the molding groove of the lower mold, smoothly ejecting the workpiece. After the workpiece is removed, the cylinder resets, causing the ejector rod to retract, and the mold enters the next cycle.

[0023] When the user needs to add coolant, simply inject the coolant into the reservoir through the filling pipe and seal it with the end cap. During use, the cooling and forming mechanisms operate independently, ensuring that the workpiece forming process is not significantly affected.

[0024] Beneficial effects: In this utility model, the injection mold capable of circulating cooling, through the built-in first heat conduction pipe and circulating cooling component, can achieve rapid and effective cooling of the mold; the coolant flows in the first heat conduction pipe, absorbs the heat near the molding groove of the mold, and the circulating cooling component circulates and cools the coolant, thereby ensuring that the mold temperature is always kept within a suitable range, improving product quality and production efficiency.

[0025] In this invention, the injection mold capable of cyclic cooling can significantly reduce energy consumption and noise by adopting a cyclic cooling method; at the same time, the coolant can be reused during the circulation process, reducing coolant consumption and waste generation, which is beneficial to energy conservation, emission reduction and environmental protection.

[0026] In this utility model, the injection mold capable of cyclic cooling is provided with corresponding first heat conduction pipes in the two mating molds, so that the two molds can continue to dissipate heat independently even after separation, which helps to ensure effective cooling of the mold during the injection process and ensures better workpiece molding effect.

[0027] In this invention, the injection mold, through its built-in first heat-conducting pipe and circulating cooling component, enables rapid and precise temperature control. The coolant efficiently absorbs heat from the molding area and circulates through the heat dissipation mechanism, ensuring stable mold temperature and significantly improving product quality and molding efficiency. The closed-loop circulation design greatly reduces energy consumption and operating noise. The independent heat-conducting structure of the two molds ensures efficient heat dissipation even when the molds are separated, guaranteeing process continuity. The compact design and automated ejection mechanism simplify the operation process, extend mold life, and comprehensively optimize production efficiency and economy. Attached Figure Description

[0028] Figure 1 This is a three-dimensional structural diagram of an injection mold capable of cyclic cooling proposed in this utility model;

[0029] Figure 2 This is a cross-sectional view of the upper and lower molds of an injection mold capable of cyclic cooling, as proposed in this utility model.

[0030] Figure 3 This is a schematic diagram of the disassembled structure of the lower mold of an injection mold capable of cyclic cooling, as proposed in this utility model.

[0031] Figure 4 This is a schematic diagram of the ejection assembly structure of an injection mold capable of cyclic cooling, as proposed in this utility model.

[0032] Figure 5 This is a schematic diagram of the circulating cooling component structure of an injection mold capable of cyclic cooling, as proposed in this utility model.

[0033] Figure 6 This is a cross-sectional view of a circulating cooling component for an injection mold that can circulate cooling, as proposed in this utility model.

[0034] Figure 7 This is a schematic diagram of a cooling mechanism for an injection mold capable of cyclic cooling, as proposed in this utility model.

[0035] In the diagram: 1. Lower mold; 2. Upper mold; 3. Injection hole; 4. Liquid storage tank; 5. First heat conduction pipe; 6. Movable cavity; 7. Moving plate; 8. Cylinder; 9. Push rod; 10. T-shaped rod; 11. Moving frame; 12. Guide groove; 13. Heat dissipation frame; 14. Mounting shell; 15. Ventilation hole; 16. Infusion pipe; 17. First flexible pipe; 18. Second flexible pipe; 19. Circulation pump; 20. Fixed plate; 21. Heat conduction fins; 22. Second heat conduction pipe; 23. Fan; 24. Mounting plate. Detailed Implementation

[0036] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.

[0037] Example 1: Refer to Figure 1-7 An injection mold includes: a lower mold 1, an upper mold 2, an ejector assembly, a first heat pipe 5, and a circulating cooling assembly, etc.

[0038] In this embodiment, the lower mold 1 and the upper mold 2 constitute the main structure of the mold. The upper mold 2 is positioned above the lower mold 1, and the two are slidably engaged by multiple guide rods fixedly installed on the top of the lower mold 1. Each of the lower mold 1 and the upper mold 2 has a corresponding forming groove on its adjacent side for forming the required workpiece. The upper mold 2 has a through-hole 3, which communicates with the corresponding forming groove to inject the material to be formed into the forming groove.

[0039] In this embodiment, the ejection assembly is used to eject the formed workpiece from the forming groove. Specifically, the ejection assembly includes a movable cavity 6 formed within the lower mold 1, and a movable plate 7 is slidably installed inside the movable cavity 6. Multiple ejector rods 9 are fixedly installed on the top of the movable plate 7, and all ejector rods 9 slide through the forming groove of the lower mold 1 in a sealed manner. A movable frame 11 is fixedly installed on the bottom of the movable plate 7, and guide grooves 12 are formed through both sides of the movable frame 11, with the guide grooves 12 inclined relative to the movable plate 7. A cylinder 8 is fixedly installed on one side of the lower mold 1, and one end of the output shaft of the cylinder 8 slides through one side of the lower mold 1 and is fixedly installed with a T-shaped rod 10. One end of the T-shaped rod 10 extends into the movable cavity 6, and the T-shaped rod 10 slides into the inner walls of both guide grooves 12. When the output shaft of the cylinder 8 moves horizontally, the T-shaped rod 10 slides within the guide groove 12, thereby driving the movable plate 7 to move the multiple ejector rods 9 in a lifting motion, ejecting the formed workpiece from the forming groove.

[0040] In this embodiment, two first heat conduction pipes 5 are fixedly embedded in the lower mold 1 and the upper mold 2 respectively, and both first heat conduction pipes 5 are close to the adjacent molding grooves. Both ends of the two first heat conduction pipes 5 penetrate one side of the corresponding mold so that the coolant can flow in and out smoothly.

[0041] In this embodiment, the circulating cooling component is used to continuously supply coolant to the two first heat-conducting pipes 5 and to circulate and cool the coolant accordingly. The circulating cooling component includes a storage tank 4 containing coolant, a cooling mechanism, and a delivery mechanism.

[0042] In this embodiment, the infusion mechanism includes a circulation pump 19 fixedly installed on the inner wall of the bottom of the storage tank 4. An infusion pipe 16 is fixedly installed on one side of the storage tank 4, with one end of the infusion pipe 16 fixedly penetrating one side of the storage tank 4 and fixedly connected to the outlet end of the circulation pump 19. A branch pipe is fixedly connected to the outer wall of the infusion pipe 16, and the infusion pipe 16 is fixedly connected to the inlet end of the first heat-conducting pipe 5 located in the lower mold 1 through the branch pipe. A first flexible pipe 17 is fixedly installed at the top end of the infusion pipe 16, and the other end of the first flexible pipe 17 is fixedly connected to the inlet end of the first heat-conducting pipe 5 located in the upper mold 2. When the circulation pump 19 is started, the coolant is drawn from the storage tank 4, passes through the infusion pipe 16, the branch pipe, and the first flexible pipe 17 in sequence, and enters the two first heat-conducting pipes 5 to cool the mold.

[0043] In this embodiment, the infusion mechanism also includes a heat dissipation frame 13 fixedly installed on the top of the storage tank 4. The heat dissipation frame 13 has two vertically arranged second heat-conducting pipes 22 inside. One end of each of the two second heat-conducting pipes 22 is joined together and fixedly penetrates the top of the storage tank 4 to facilitate the return of coolant. The other end of the lower second heat-conducting pipe 22 is fixedly connected to the outlet end of the first heat-conducting pipe 5 located in the lower mold 1 via a pipe. The other end of the other second heat-conducting pipe 22 is fixedly installed with a second flexible pipe 18, the other end of which is fixedly connected to the outlet end of the first heat-conducting pipe 5 located in the upper mold 2. The coolant flowing from the first heat-conducting pipe 5 passes sequentially through the pipe, the second heat-conducting pipe 22, and the second flexible pipe 18, returning to the storage tank 4.

[0044] In this embodiment, the cooling mechanism includes two fans 23 disposed on one side of the heat sink 13. The heat sink 13 consists of a fixed plate 20 and multiple heat-conducting fins 21. The multiple heat-conducting fins 21 are spaced apart and are all vertically fixedly installed on the top of the fixed plate 20. Two second heat-conducting pipes 22 pass through the multiple heat-conducting fins 21. The two fans 23 are fixedly installed on one side of the multiple heat-conducting fins 21 by brackets. When the fans 23 are started, air flows between the multiple heat-conducting fins 21, working with the heat-conducting fins 21 to rapidly cool the two second heat-conducting pipes 22 and the coolant passing through them.

[0045] This application can be used in the field of injection molding technology, or in other fields applicable to this application.

[0046] Example 2: Reference Figure 1 , 5 An improvement based on Example 1: an injection mold capable of cyclic cooling, which is applied to the field of injection molding technology;

[0047] In this embodiment, a mounting shell 14 is fixedly installed on the top of the liquid storage tank 4. Multiple ventilation holes 15 are provided on both sides of the mounting shell 14 to ensure smooth airflow. The top and one side of the mounting shell 14 are provided with slots for pipes to pass through. The mounting shell 14 is used to protect the heat sink 13 and the corresponding pipes.

[0048] In this embodiment, in order to improve the heat transfer efficiency, both first heat pipes 5 and two second heat pipes 22 have a serpentine structure with repeated bends to increase the area in close contact with the object.

[0049] In this embodiment, a liquid filling pipe is fixedly installed through one side of the liquid storage tank 4, and an end cap is threaded onto the top of the liquid filling pipe so that the coolant can be conveniently replenished when needed.

[0050] In this embodiment, the bottom of the lower mold 1 and the liquid storage tank 4 are fixedly installed with the same mounting plate 24 to complete the installation and fixation of the lower mold 1 and the liquid storage tank 4.

[0051] However, as is well known to those skilled in the art, the working principles and wiring methods of cylinder 8, circulating pump 19 and fan 23 are commonplace and are all conventional methods or common knowledge, so they will not be described in detail here. Those skilled in the art can make any selections according to their needs or convenience.

[0052] The working principle and usage process of this technical solution are as follows:

[0053] When the molds are closed, the upper mold 2 and the lower mold 1 are slidably engaged and closed by the guide rods, and the material to be molded is injected into the molding groove through the injection hole 3. During the molding process, the circulation pump 19 is started, and the coolant in the storage tank 4 is transported through the delivery pipe 16 and its branch pipes to the first heat-conducting pipe 5 in the lower mold 1 and the upper mold 2 respectively. When the coolant flows through the first heat-conducting pipe 5, it absorbs the heat near the molding groove of the mold, and then enters the heat sink 13 through the second flexible pipe 18 and the second heat-conducting pipe 22.

[0054] Subsequently, the coolant flowing into the heat sink 13 flows along the second heat pipe 22. Two fans 23 start and accelerate the airflow through the heat-conducting fins 21, causing the heat from the coolant in the second heat pipe 22 to dissipate rapidly through the fins. The cooled coolant then flows back to the storage tank 4 via the second heat pipe 22, completing the cooling cycle. The mounting shell 14 ensures unobstructed airflow through the ventilation holes 15, improving heat dissipation efficiency. The serpentine structure design of the first heat pipe 5 and the second heat pipe 22 increases the contact area with the mold and the heat-conducting fins 21, enhancing heat transfer efficiency.

[0055] After molding is completed, cylinder 8 drives T-shaped rod 10 to move horizontally. T-shaped rod 10 slides in conjunction with guide groove 12 of moving frame 11, forcing moving frame 11 and moving plate 7 to rise vertically along movable cavity 6. Ejector rod 9 then extends out of molding groove of lower mold 1, smoothly ejecting the workpiece. After the workpiece is removed, cylinder 8 resets, causing ejector rod 9 to retract, and mold enters the next cycle.

[0056] When the user needs to add coolant, simply inject the coolant into the reservoir 4 through the filling pipe and seal it with the end cap. During mold use, the cooling mechanism and the forming mechanism operate independently, ensuring that the forming of the workpiece is not significantly affected.

[0057] The accompanying drawings in this application are for illustrative purposes only. The dimensions and shapes of the components shown are not actual limitations but are merely schematic representations. In actual implementation, the components can be reasonably configured and adjusted according to specific needs and actual conditions.

[0058] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.

Claims

1. A cyclically temperature-controllable injection mold characterized by comprising: include: The lower mold (1) and the upper mold (2) are slidably connected to the top of the lower mold (1) by a guide rod. The opposing surfaces of the two are respectively provided with forming grooves. The upper mold (2) is provided with an injection hole (3) that connects to the forming groove. Two serpentine first heat conduction pipes (5) are respectively embedded in the lower mold (1) and the upper mold (2) and adjacent to the corresponding forming grooves. The two ends of the first heat conduction pipes (5) extend to the outside of the mold. The circulating cooling component includes a liquid storage tank (4), a heat sink (13) and a circulating pump (19). The outlet of the circulating pump (19) is connected to the inlet of two first heat conduction pipes (5) through a liquid delivery pipe (16). The heat sink (13) is provided with two second heat conduction pipes (22). The outlet of the second heat conduction pipes (22) is connected to the liquid storage tank (4), and the inlet is connected to the outlet of the two first heat conduction pipes (5). The heat sink (13) is provided with a cooling mechanism to accelerate the heat dissipation of the second heat conduction pipes (22). The coolant is pumped into the corresponding first heat pipe (5) by the circulating pump (19) to absorb the heat of the molding tank, and then flows through the second heat pipe (22) to dissipate heat and return to the storage tank (4), forming a closed-loop cooling cycle.

2. The injection mold according to claim 1, characterized in that, The cooling mechanism includes a fixed plate (20) and a plurality of heat-conducting fins (21) arranged at intervals. The second heat-conducting pipe (22) passes through the plurality of heat-conducting fins (21). Two fans (23) are provided on the side of the fixed plate (20).

3. The injection mold according to claim 2, characterized in that, The heat sink (13) has a mounting shell (14) on top, and multiple ventilation holes (15) are opened on both sides of the mounting shell (14). The second heat pipe (22) passes through the slot provided on the top of the mounting shell (14).

4. The injection mold according to claim 1, characterized in that, The infusion tube (16) is connected to the inlet end of the first heat-conducting tube (5) in the lower mold (1) through a branch pipe, and is connected to the inlet end of the first heat-conducting tube (5) in the upper mold (2) through a first flexible tube (17).

5. The injection mold according to claim 4, characterized in that, The second heat pipe (22) includes two sets of pipes arranged vertically. The lower pipe is connected to the liquid outlet of the first heat pipe (5) in the lower mold (1) through a pipe, and the upper pipe is connected to the liquid outlet of the first heat pipe (5) in the upper mold (2) through a second flexible pipe (18).

6. The injection mold according to claim 1, characterized in that, It also includes an ejector assembly, which includes a movable plate (7) slidably disposed in the movable cavity (6). The top of the movable plate (7) is provided with multiple ejector rods (9) that penetrate the forming groove of the lower mold (1), and the bottom is connected to a movable frame (11) with an inclined guide groove (12). A T-shaped rod (10) driven by a cylinder (8) slides in cooperation with the guide groove (12) to drive the ejector rods (9) to rise and fall.

7. The injection mold according to claim 1, characterized in that, The liquid storage tank (4) is provided with a liquid filling pipe with an end cap on the side, and the bottom is fixedly connected to the lower mold (1) through the mounting plate (24).

8. The injection mold according to claim 2, characterized in that, The contact surface between the heat-conducting fins (21) and the second heat-conducting pipe (22) is coated with a layer of heat-conducting silicone grease.

9. The injection mold according to claim 6, characterized in that, The inner wall of the active cavity (6) is provided with a sealing ring that matches the edge of the moving plate (7), and the multiple top rods (9) all slide through the inner wall of the adjacent forming groove in a sealed manner.

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