Forming mold for injection molding of medical apparatus and instruments

Abstract

The utility model discloses a forming die for injection molding of medical instruments, which relates to the technical field of injection molding of medical instruments and comprises an upper die holder, a lower die holder is arranged below the upper die holder, a hydraulic rod is fixedly connected to the outer wall of the top of the lower die holder, and the output end of the hydraulic rod is fixedly connected to the outer wall of the bottom of the upper die holder. An injection molding female mold is arranged above the lower mold base, and injection molding grooves distributed at equal intervals are formed in the outer wall of the top of the injection molding female mold. The cooling device can be effectively matched with the liquid inlet pipe and the liquid outlet pipe to form an efficient cooling circulation system, and the cooling cavity is unique in structural design, for example, the height is gradually reduced in the direction close to the liquid outlet pipe, the cross section is in an isosceles trapezoid shape, and the inner diameter is gradually reduced in the direction close to the liquid outlet pipe. The cooling medium can be uniformly distributed and quickly flows in the cavity, so that the cooling efficiency is greatly improved, the product cooling time is shortened, the production efficiency is remarkably improved, and the production cost is reduced.

Description

Technical Field

[0001] This utility model relates to the field of injection molding technology for medical devices, and in particular to molding dies used for injection molding of medical devices. Background Technology

[0002] The cooling system design of existing medical device injection molds is inadequate, with unreasonable flow paths and distribution of the cooling medium within the mold. For example, the layout of cooling channels is often too simple, preventing the cooling medium from fully and evenly exchanging heat with the injection material as it flows through different areas of the mold. This results in uneven cooling, with inconsistent cooling rates in different parts of the culture dish, thus affecting product quality. Localized uneven shrinkage may also occur, leading to poor surface smoothness of the medical device and impacting its subsequent performance.

[0003] Furthermore, existing mold cooling systems lack agitation mechanisms for the cooling medium, making it prone to temperature stratification as the medium flows within the cooling chamber. This results in significant differences in cooling efficiency near the inlet and outlet, further exacerbating the uneven cooling of the injection-molded material. Consequently, the quality of the molded medical device molds becomes unstable, increasing the defect rate and raising production costs. Therefore, there is an urgent need for molding dies used in medical device injection molding to address these issues. Utility Model Content

[0004] The purpose of this invention is to address the shortcomings of existing technologies by providing a molding die for injection molding of medical devices. Its advantages include: it allows for sufficient heat exchange with the material in the injection tank, thereby accelerating the rapid molding of the material.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] A molding die for injection molding of medical devices includes an upper mold base and a lower mold base located below the upper mold base. A hydraulic rod is fixedly connected to the top outer wall of the lower mold base, and the output end of the hydraulic rod is fixedly connected to the bottom outer wall of the upper mold base. An injection master mold is located above the lower mold base, and the top outer wall of the injection master mold has equally spaced injection grooves. An injection male mold is fixedly connected to the bottom outer wall of the upper mold base, and the bottom outer wall of the injection male mold has equally spaced die heads that mate with the injection grooves. The top outer wall of the upper mold base has injection holes and injection runners that are interconnected.

[0007] Through the above technical solutions, the hydraulic rod can precisely control the lifting and lowering of the upper mold base, realizing the rapid and stable mold closing and opening actions of the injection male mold and the injection female mold, providing reliable mechanical protection for the injection process, ensuring the smooth progress of injection operation, and greatly improving production efficiency.

[0008] Preferably, a guide post is fixedly connected to the top outer wall of the lower mold base, and one end of the guide post passes through the top of the upper mold base.

[0009] The above technical solutions effectively avoid potential misalignment of the upper mold base during movement, ensure the high accuracy of the mold closing height between the male and female injection molds, and provide crucial support for the precise docking of the mold head and injection groove. This ensures the dimensional accuracy of medical device products and improves the stability of product quality.

[0010] Preferably, a base plate is fixedly connected to the top outer wall of the lower mold base, a support plate is fixedly connected to the top outer wall of the base plate, and the side of the support plate away from the base plate is fixedly connected to the bottom outer wall of the injection mold.

[0011] The above technical solutions provide a stable support foundation for the injection mold, ensuring its stability during the injection process and preventing displacement or shaking of the injection mold due to factors such as injection pressure, which could affect the molding quality of the product.

[0012] Preferably, a positioning post is fixedly connected to the bottom outer wall of the injection male mold, and a guide hole is provided on the top outer wall of the injection female mold, with the positioning post cooperating with the guide hole.

[0013] Through the above technical solutions, the positioning pins can be quickly and accurately inserted into the guide holes during the mold closing process, which not only improves the convenience of the mold closing operation, but also ensures that the mold head and the injection groove can be accurately matched, providing a strong guarantee for the production of high-precision medical device products.

[0014] Preferably, the injection mold has a cooling cavity inside, and an inlet pipe and an outlet pipe are respectively provided on both sides of the injection mold, and the inlet pipe and the outlet pipe are connected to the cooling cavity.

[0015] The above technical solution enables sufficient heat exchange with the injection material in the injection tank, thereby quickly removing the heat from the material and accelerating the cooling and molding process. The outlet pipe is responsible for discharging the cooling medium after absorbing heat, realizing the recycling of the cooling medium and improving the working efficiency of the cooling system.

[0016] Preferably, the height of the cooling chamber gradually decreases along the direction close to the liquid outlet pipe, and the cross-section of the cooling chamber is an isosceles trapezoid.

[0017] Through the above technical solutions, the cooling medium can be more evenly distributed in the cooling chamber during the flow process, and the cooling medium near the liquid outlet pipe has a faster renewal rate, ensuring that the cooling medium can evenly cool the injection tank at different locations, effectively improving the uniformity of the cooling effect and reducing quality problems caused by uneven cooling of the product.

[0018] Preferably, the bottom inner wall of the cooling chamber is provided with an arc-shaped groove, the arc-shaped grooves are evenly distributed on the bottom inner wall of the cooling chamber, and the inner diameter of the cooling chamber gradually decreases along the direction close to the liquid outlet pipe.

[0019] The above technical solutions can increase the flow path and turbulence of the cooling medium in the cooling chamber, thereby increasing the contact area between the cooling medium and the inner wall of the cooling chamber, thus improving the heat exchange efficiency and further accelerating the cooling process of the injection molded material.

[0020] Preferably, rotating columns are rotatably connected to the inner walls of both sides of the cooling cavity, and fixed sleeves are fixedly connected to the outer circumference of the rotating columns. Thin plates that are evenly distributed in a circular pattern are fixedly connected to the outer circumference of the fixed sleeves, and the length of the thin plates gradually decreases in the clockwise direction.

[0021] The above technical solutions can agitate the cooling medium, effectively preventing temperature stratification within the cooling chamber, ensuring a more uniform temperature distribution, improving the stability of the cooling effect, further guaranteeing uniform cooling of the injection molded material, and reducing the product defect rate.

[0022] The beneficial effects of this utility model are as follows:

[0023] 1. The molding die for injection molding of medical devices, through the setting of guide pillars, allows the upper mold base to move precisely along the guide pillars during the descent, effectively avoiding offset and ensuring the accuracy of the mold closing between the male and female injection molds. At the same time, the cooperation between the positioning pillars and guide holes further improves the positioning accuracy, enabling the mold head and injection groove to be precisely aligned, greatly improving the dimensional accuracy of medical device products, ensuring stable and reliable product quality, and meeting the stringent medical industry standards.

[0024] 2. The molding die for injection molding of medical devices, through the setting of a cooling chamber, can effectively cooperate with the inlet and outlet pipes to form a highly efficient cooling circulation system. The unique structural design of the cooling chamber, such as the height gradually decreasing along the direction near the outlet pipe, the cross-section being an isosceles trapezoid, and the inner diameter gradually decreasing along the direction near the outlet pipe, can make the cooling medium evenly distributed and flow rapidly in the chamber, greatly improving cooling efficiency, shortening the product cooling time, and thus significantly improving production efficiency and reducing production costs. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the overall front structure of the molding die for injection molding of medical devices proposed in this utility model.

[0026] Figure 2 This is a bottom view of the overall structure of the molding die for injection molding of medical devices proposed in this utility model.

[0027] Figure 3 This is a half-sectional view of the guide hole structure of the molding die for injection molding of medical devices proposed in this utility model.

[0028] Figure 4 This is a half-sectional view of the cooling chamber of the molding die for injection molding of medical devices proposed in this utility model.

[0029] Figure 5 The molding die for injection molding of medical devices proposed in this utility model Figure 4 A magnified structural diagram of point A in the middle.

[0030] In the diagram: 1. Upper mold base; 2. Injection hole; 3. Guide post; 4. Lower mold base; 5. Hydraulic rod; 6. Support plate; 7. Base plate; 8. Injection female mold; 9. Injection groove; 10. Injection male mold; 11. Mold head; 12. Positioning post; 13. Guide hole; 14. Cooling chamber; 15. Injection runner; 16. Inlet pipe; 17. Outlet pipe; 18. Horizontal pipe; 19. Arc groove; 20. Thin plate; 21. Rotating column. Detailed Implementation

[0031] The technical solution of this patent will be further described in detail below with reference to specific embodiments.

[0032] The embodiments of this patent are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this patent, and should not be construed as limiting this patent.

[0033] In the description of this patent, it should be understood that the terms “center,” “upper,” “lower,” “front,” “back,” “left,” “right,” “vertical,” “horizontal,” “top,” “bottom,” “inner,” and “outer,” etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this patent and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this patent.

[0034] In the description of this patent, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "setting" should be interpreted broadly. For example, they can refer to a fixed connection or setting, a detachable connection or setting, or an integral connection or setting. Those skilled in the art can understand the specific meaning of the above terms in this patent according to the specific circumstances.

[0035] Reference Figures 1-5 A molding die for injection molding of medical devices includes an upper mold base 1, a lower mold base 4 below the upper mold base 1, a hydraulic rod 5 fixedly connected to the top outer wall of the lower mold base 4, the output end of the hydraulic rod 5 fixedly connected to the bottom outer wall of the upper mold base 1, an injection female mold 8 above the lower mold base 4, injection grooves 9 evenly distributed on the top outer wall of the injection female mold 8, an injection male mold 10 fixedly connected to the bottom outer wall of the upper mold base 1, and mold heads 11 evenly distributed on the bottom outer wall of the injection male mold 10. The mold heads 11 and the injection grooves 9 are connected... In conjunction with this, the top outer wall of the upper mold base 1 is provided with injection holes 2 and injection runners 15, which are interconnected. The coordinated arrangement of the upper mold base 1, lower mold base 4, hydraulic rod 5, injection female mold 8, injection male mold 10, and mold head 11 forms a complete and efficient basic framework for injection molding. The hydraulic rod 5 can precisely control the lifting and lowering of the upper mold base 1, enabling the rapid and stable mold closing and opening actions of the injection male mold 10 and the injection female mold 8, providing reliable mechanical protection for the injection process, ensuring the smooth progress of injection operation, and greatly improving production efficiency.

[0036] Furthermore, a guide post 3 is fixedly connected to the top outer wall of the lower mold base 4. One end of the guide post 3 passes through the top of the upper mold base 1, providing a precise guide path for the upper mold base 1 during its descent. This effectively avoids the possible deviation of the upper mold base 1 during its movement, ensuring the accuracy of the mold closing height between the injection male mold 10 and the injection female mold 8. This provides key support for the precise docking of the mold head 11 and the injection groove 9, thereby ensuring the dimensional accuracy of the medical device products and improving the stability of product quality.

[0037] Furthermore, a base plate 7 is fixedly connected to the top outer wall of the lower mold base 4, and a support plate 6 is fixedly connected to the top outer wall of the base plate 7. The side of the support plate 6 away from the base plate 7 is fixedly connected to the bottom outer wall of the injection mold 8, providing a stable support foundation for the injection mold 8, ensuring the stability of the injection mold 8 during the injection process, and avoiding displacement or shaking of the injection mold 8 due to factors such as injection pressure, thereby affecting the molding quality of the product.

[0038] Furthermore, a positioning post 12 is fixedly connected to the bottom outer wall of the injection male mold 10, and a guide hole 13 is provided on the top outer wall of the injection female mold 8. The positioning post 12 and the guide hole 13 cooperate to further enhance the positioning accuracy when the injection male mold 10 and the injection female mold 8 are closed. During the mold closing process, the positioning post 12 can be quickly and accurately inserted into the guide hole 13, which not only improves the convenience of the mold closing operation, but also ensures that the mold head 11 and the injection groove 9 can be accurately matched, providing a strong guarantee for the production of high-precision medical device products.

[0039] Furthermore, a cooling chamber 14 is provided inside the injection mold 8. An inlet pipe 16 and an outlet pipe 17 are respectively provided on both sides of the injection mold 8. Both the inlet pipe 16 and the outlet pipe 17 are connected to the cooling chamber 14. The cooling medium is introduced into the cooling chamber 14 through the inlet pipe 16. During the flow of the cooling medium in the cooling chamber 14, it can fully exchange heat with the injection material in the injection tank 9, thereby quickly removing the heat of the material and accelerating the cooling and molding process of the material. The outlet pipe 17 is responsible for discharging the cooling medium after absorbing heat, realizing the recycling of the cooling medium and improving the working efficiency of the cooling system.

[0040] Furthermore, the height of the cooling chamber 14 gradually decreases along the direction close to the liquid outlet pipe 17, and the cross-section of the cooling chamber 14 is an isosceles trapezoid, which optimizes the flow state and distribution of the cooling medium in the cooling chamber 14. During the flow process, the cooling medium can be more evenly distributed in the cooling chamber 14, and the cooling medium on the side close to the liquid outlet pipe 17 has a faster renewal rate, ensuring that the cooling medium can evenly cool the injection tank 9 at different locations, effectively improving the uniformity of the cooling effect and reducing quality problems caused by uneven cooling of the product.

[0041] Furthermore, an arc-shaped groove 19 is provided on the bottom inner wall of the cooling cavity 14. The arc-shaped grooves 19 are evenly distributed on the bottom inner wall of the cooling cavity 14. The inner diameter of the cooling cavity 14 gradually decreases along the direction close to the liquid outlet pipe 17, which can increase the flow path and turbulence of the cooling medium in the cooling cavity 14, increase the contact area between the cooling medium and the inner wall of the cooling cavity 14, thereby improving the heat exchange efficiency and further accelerating the cooling process of the injection molding material.

[0042] Furthermore, rotating columns 21 are rotatably connected to both inner walls of the cooling chamber 14. A fixed sleeve is fixedly connected to the outer circumference of each rotating column 21. Thin plates 20, evenly spaced and circularly distributed, are fixedly connected to the outer circumference of the fixed sleeve. The length of the thin plates 20 gradually decreases clockwise, acting as agitators during the flow of the cooling medium. When the cooling medium is injected into the cooling chamber 14 through the inlet pipe 16, it impacts the thin plates 20, causing them to rotate along with the rotating columns 21 and the fixed sleeve, thus agitating the cooling medium. This effectively prevents temperature stratification within the cooling chamber 14, ensuring a more uniform temperature distribution and improving the stability of the cooling effect. This further guarantees uniform cooling of the injection-molded material and reduces the product defect rate.

[0043] Working Principle: During operation, the hydraulic rod 5 is activated, causing the upper mold base 1 and the injection mold 10 to descend together until the positioning pin 12 at the bottom of the injection mold 10 is fully inserted into the guide hole 13. The hydraulic rod 5 is then stopped. Subsequently, the operator injects material into the injection hole 2. The material flows through the injection channel 15 into the gap between the injection head and the injection tank 9. After cooling, it is molded into a finished medical device (such as a petri dish). After the injection molding is completed, the external water pipe is connected to the horizontal pipe 18. At this time, cooling water flows into the cooling chamber 14 through the horizontal pipe 18 and the liquid inlet pipe 16. The cooling water can fully exchange heat with the material in the injection tank 9, thereby accelerating the rapid molding of the material. At the same time, since the cross-section of the cooling chamber 14 is a right trapezoid, the amount of coolant on the side away from the liquid inlet pipe 16 is relatively small, thus accelerating the rate of coolant renewal in that area. This ensures that the cooling water can uniformly cool the injection tank 9 at different locations, effectively guaranteeing the cooling effect. Furthermore, as the cooling water is injected into the cooling chamber 14 through the inlet pipe 16, it impacts the thin plate 20, causing it to rotate and agitate the cooling water. This prevents the cooling water from being hot at the top and cold at the bottom, which would affect the cooling effect. Additionally, the varying lengths of the thin plates 20 allow for more comprehensive action on the water compared to a single-length plate. Longer plates can agitate water at greater depths and distances, while shorter plates generate stronger disturbances at closer and shallower areas. This ensures thorough mixing at different depths and locations, improving the uniformity and efficiency of the agitation. The resulting more turbulent water flow prevents significant temperature differences within the cooling chamber 14, guaranteeing uniform cooling of the material in the injection tank 9.

[0044] 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 molding die for injection molding of a medical device, comprising an upper die seat (1), characterized in that, A lower mold base (4) is provided below the upper mold base (1). A hydraulic rod (5) is fixedly connected to the top outer wall of the lower mold base (4). The output end of the hydraulic rod (5) is fixedly connected to the bottom outer wall of the upper mold base (1). An injection mold (8) is provided above the lower mold base (4). An injection groove (9) is provided on the top outer wall of the injection mold (8). An injection male mold (10) is fixedly connected to the bottom outer wall of the upper mold base (1). An injection head (11) is fixedly connected to the bottom outer wall of the injection male mold (10). An injection hole (2) and an injection runner (15) are provided on the top outer wall of the upper mold base (1). The injection hole (2) and the injection runner (15) are interconnected.

2. The molding die for injection molding of a medical instrument according to claim 1, characterized by, The lower mold base (4) is fixedly connected to the top outer wall of a guide post (3), one end of which passes through the top of the upper mold base (1).

3. The molding die for injection molding of a medical instrument according to claim 2, characterized by, The bottom outer wall of the lower mold base (4) is fixedly connected to a base plate (7), and the top outer wall of the base plate (7) is fixedly connected to a support plate (6). The side of the support plate (6) away from the base plate (7) is fixedly connected to the bottom outer wall of the injection mold (8).

4. The molding die for injection molding of a medical instrument according to claim 3, characterized by The bottom outer wall of the injection mold (10) is fixedly connected with a positioning post (12), and the top outer wall of the injection mold (8) is provided with a guide hole (13), and the positioning post (12) cooperates with the guide hole (13).

5. The molding die for injection molding of a medical instrument according to claim 4, characterized by, The injection mold (8) has a cooling cavity (14) inside. The injection mold (8) has an inlet pipe (16) and an outlet pipe (17) on its two sides, respectively. The inlet pipe (16) and the outlet pipe (17) are connected to the cooling cavity (14).

6. The molding die for injection molding of a medical instrument according to claim 5, characterized by The height of the cooling cavity (14) gradually decreases along the direction close to the liquid outlet pipe (17), and the cross-section of the cooling cavity (14) is an isosceles trapezoid.

7. The molding die for injection molding of a medical instrument according to claim 6, characterized by The cooling chamber (14) has an arc-shaped groove (19) on its bottom inner wall. The arc-shaped grooves (19) are evenly distributed on the bottom inner wall of the cooling chamber (14). The inner diameter of the cooling chamber (14) gradually decreases along the direction close to the liquid outlet pipe (17).

8. The molding die for injection molding of a medical instrument according to claim 7, characterized by, The inner walls on both sides of the cooling cavity (14) are rotatably connected to rotating columns (21). The outer circumference of the rotating column (21) is fixedly connected to a fixed sleeve. The outer circumference of the fixed sleeve is fixedly connected to thin plates (20) that are evenly distributed in a circular pattern. The length of the thin plates (20) gradually decreases in the clockwise direction.

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