Injection mold convenient to demold

Abstract

The utility model discloses an injection mold convenient to demold, which comprises a placing bottom plate, a movable mold is arranged at the upper end of the placing bottom plate, a fixed mold is arranged on one side of the movable mold, the fixed mold is movably connected to the upper end of the placing bottom plate, the inner side of the fixed mold is fixedly connected with a concave mold, and the concave mold is fixedly connected with a movable mold. An injection molding groove is formed in one side of the female die, an ejection assembly is arranged at the lower end of the injection molding groove and comprises an ejection frame, and an ejection rod is fixedly connected to one end of the ejection frame; after the arc-shaped opening and closing plate is opened, the ejector rod continuously ascends to enable an internal component of the ejector frame to eject the ejection opening and closing plate open, and then the pushing plate pushes the material conveying pipe to drive the telescopic hose and the branch pipe to deflect and expand outwards, so that the spraying nozzle is close to an injection molding inner cavity, and a release agent or other required liquid is uniformly sprayed on the surface of the injection molding inner cavity; and auxiliary demolding is achieved, the situation that injection molding products adhere to the mold when moved out is effectively prevented, product damage is reduced, and the product percent of pass is increased.

Description

Technical Field

[0001] This utility model relates to the field of injection molding device-assisted demolding technology, specifically an injection mold that facilitates demolding. Background Technology

[0002] In the field of injection molding, traditional injection molds often face many challenges in the demolding process. During the injection process, the molten plastic is injected into the mold cavity under high temperature and pressure. After molding, the product fits tightly with the mold, and during demolding, the product is prone to sticking to the mold. This not only leads to quality problems such as scratches and deformation on the product surface, reducing the product pass rate, but also increases the demolding difficulty, prolongs the production cycle, and reduces production efficiency. Moreover, during the demolding process, due to the lack of effective protection and auxiliary measures, some precision components inside the mold are easily interfered with and damaged by external factors such as plastic residues and dust, affecting the service life of the mold and the subsequent injection molding quality.

[0003] To improve the demolding performance of injection molds, several demolding assistance technologies have emerged in the industry. For example, some molds use simple ejection mechanisms to eject the product from the mold. However, these ejection mechanisms are not effective in preventing molten plastic from entering internal components, which can easily lead to malfunctions and affect the demolding effect. In addition, some molds use manual application of release agent to assist demolding. However, this method is not only inefficient, but also makes it difficult to ensure the uniformity of the release agent application, which cannot meet the needs of large-scale production. This makes the mold prone to problems during long-term use, increasing production costs and maintenance difficulties. Therefore, we propose an injection mold that facilitates demolding. Utility Model Content

[0004] One of the technical problems this application aims to solve is: addressing the issues of difficulty in demolding traditional injection molds, easy adhesion, easy damage to internal components, and limitations of existing demolding assistance technologies during the use of injection molds.

[0005] To solve the above-mentioned technical problems, this application provides an injection mold that facilitates demolding, including a base plate. A movable mold is provided at the upper end of the base plate, and a fixed mold is provided on one side of the movable mold. The fixed mold is movably connected to the upper end of the base plate. A concave mold is fixedly connected to the inner side of the fixed mold. An injection groove is formed on one side of the concave mold. An ejection assembly is provided at the lower end of the injection groove. The ejection assembly includes an ejection frame. An ejection rod is fixedly connected to one end of the ejection frame. An ejection opening and closing plate is movably connected to the upper end of the ejection frame. Two ejection opening and closing plates are provided, and a first torsion spring is fixedly connected to one end of each ejection opening and closing plate.

[0006] Preferably, one end of the ejector frame is provided with a first placement groove, one end of the first torsion spring is fixedly connected to the inner side of the first placement groove, one side surface of the ejector frame is fixedly connected with a first arc-shaped plate, two first arc-shaped plates are provided and symmetrically distributed, two ejector opening and closing plates are provided, and one side surface of both ejector opening and closing plates is provided with a first arc-shaped groove.

[0007] Preferably, the outer side of the ejector frame is provided with an arc-shaped opening and closing plate, and four arc-shaped opening and closing plates are provided and evenly distributed in a circumferential array. The inner side of the arc-shaped opening and closing plate is fixedly connected with a fixing ring. Two fixing rings are provided on one side of one arc-shaped opening and closing plate and distributed in a vertical array. The inner side of the four arc-shaped opening and closing plates is provided with a spraying component.

[0008] Preferably, the spraying assembly includes branch pipes, four of which are evenly distributed in a circumferential array. Each branch pipe is fixedly connected to the inner side of the fixing ring. A telescopic hose is fixedly connected to the lower end of each branch pipe, and a feed pipe is provided at the lower end of the telescopic hose. A discharge pipe is fixedly connected to the upper end of the feed pipe. The interior of the discharge pipe is interconnected with the interior of the feed pipe. The interiors of the four branch pipes are interconnected with the interior of the feed pipe. Spray nozzles are fixedly connected to the upper ends of the four branch pipes and the discharge pipe.

[0009] Preferably, a push rod is fixedly connected to the outer side of the feeding pipe, and a push plate is fixedly connected to one end of the push rod. Two push plates are provided and symmetrically distributed. A limit ring is fixedly connected to the inner side of the ejector rod, and the feeding pipe is movably connected to the inner side of the limit ring.

[0010] Preferably, one end of the arc-shaped opening and closing plate is fixedly connected to a second torsion spring, a second arc-shaped groove is formed on one side surface of the arc-shaped opening and closing plate, a second arc-shaped plate is fixedly connected to the outer side of the ejector rod, four second arc-shaped plates are provided and evenly distributed in a circumferential array, a second placement groove is formed on one side of the second arc-shaped plate, one end of the second torsion spring is fixedly connected to the inside of the second placement groove, and the second arc-shaped groove and the second arc-shaped plate are mutually adapted.

[0011] Preferably, a punch is fixedly connected to one side of the moving mold, an injection port is provided on one side of the moving mold, a guide post is fixedly connected to one side of the moving mold, a guide groove is provided on one side of the fixed mold, the guide post and the guide groove are mutually adapted, and a positioning plate is fixedly connected to one side of the fixed mold, and two positioning plates are provided and symmetrically distributed.

[0012] This utility model has at least the following beneficial effects:

[0013] 1. After the arc-shaped opening plate is opened, the ejector rod continues to rise, causing the internal components of the ejector frame to push the opening plate open. The pusher plate then pushes the material conveying pipe, which in turn drives the telescopic hose and branch pipe to deflect and expand outward, bringing the spray nozzle closer to the injection cavity. The entire assembly can evenly spray the release agent or other required liquids onto the surface of the injection cavity, assisting in demolding and effectively preventing the injection molded products from sticking to the mold during removal, reducing product damage and improving the product qualification rate.

[0014] 2. This utility model uses an ejector rod to drive an ejector frame to eject the product from the cavity mold, achieving rapid demolding and effectively improving production efficiency. At the same time, the ejector opening and closing plate is kept closed under the action of the first torsion spring, preventing molten plastic from entering the ejector assembly during injection, ensuring a smooth demolding process, reducing demolding failures caused by plastic ingress, and improving demolding quality. The arc-shaped opening and closing plate remains closed during injection, forming a relatively enclosed space that protects the spraying assembly, preventing external factors from interfering with or damaging the spraying assembly, extending the service life of the spraying assembly, and reducing mold maintenance costs. Attached Figure Description

[0015] Figure 1 This is a three-dimensional structural diagram of the present invention from a left-side view.

[0016] Figure 2 This is a three-dimensional structural diagram of the present invention from a right-side view.

[0017] Figure 3 This is a three-dimensional structural diagram of some components of this utility model;

[0018] Figure 4 This is a first disassembled schematic diagram of the three-dimensional structure of some components of this utility model;

[0019] Figure 5 This is a second disassembled schematic diagram of the three-dimensional structure of some components of this utility model;

[0020] Figure 6 This is a third-dimensional disassembly diagram of some components of this utility model;

[0021] Figure 7 This utility model Figure 6 Enlarged schematic diagram of region A in the middle.

[0022] In the diagram: 1. Placement base plate; 2. Moving mold; 3. Fixed mold; 4. Injection port; 5. Punch; 6. Die; 7. Guide pillar; 8. Guide groove; 9. Positioning plate; 10. Injection tank; 11. Ejection assembly; 12. Ejection frame; 13. Ejection rod; 14. Ejection opening and closing plate; 15. First torsion spring; 16. First placement groove; 17. First arc plate; 18. First arc groove; 19. Arc opening and closing plate; 20. Fixing ring; 21. Spraying assembly; 22. Branch pipe; 23. Spray nozzle; 24. Telescopic hose; 25. Material conveying pipe; 26. Push plate; 27. Push rod; 28. Limiting ring; 29. ​​Discharge pipe; 30. Second torsion spring; 31. Second arc groove; 32. Second arc plate; 33. Second placement groove. Detailed Implementation

[0023] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0024] Example

[0025] Please see Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6 and Figure 7 This utility model provides a technical solution: an injection mold for easy demolding, including a base plate 1, a movable mold 2 at the upper end of the base plate 1, a fixed mold 3 on one side of the movable mold 2, the fixed mold 3 being movably connected to the upper end of the base plate 1, a concave mold 6 being fixedly connected to the inner side of the fixed mold 3, an injection groove 10 being opened on one side of the concave mold 6, an ejection assembly 11 being provided at the lower end of the injection groove 10, the ejection assembly 11 including an ejection frame 12, an ejection rod 13 being fixedly connected to one end of the ejection frame 12, an ejection opening and closing plate 14 being movably connected to the upper end of the ejection frame 12, two ejection opening and closing plates 14 being provided, a first torsion spring 15 being fixedly connected to one end of the ejection opening and closing plate 14, the first torsion spring 15 being used to ensure that the ejection opening and closing plate 14 is always in a closed state.

[0026] One end of the ejector frame 12 is provided with a first placement groove 16. One end of the first torsion spring 15 is fixedly connected to the inner side of the first placement groove 16. A first arc plate 17 is fixedly connected to one side surface of the ejector frame 12. Two first arc plates 17 are provided and are symmetrically distributed. Two ejector opening and closing plates 14 are provided. One side surface of each of the two ejector opening and closing plates 14 is provided with a first arc groove 18. Under normal conditions, the ejector opening and closing plates 14 remain closed to prevent the plastic melt from entering the ejector assembly 11 during injection molding. When demolding, the ejector rod 13 moves upward, driving the ejector frame 12 to rise together, thereby ejecting the product from the cavity mold 6 and realizing demolding. Then, the internal components are used to open the ejector opening and closing plates 14. The first arc plate 17 and the first arc groove 18 cooperate with each other to facilitate the stable opening and closing of the ejector opening and closing plates 14.

[0027] The outer side of the ejector frame 12 is provided with an arc-shaped opening and closing plate 19. There are four arc-shaped opening and closing plates 19 and they are evenly distributed in a circumferential array. The inner side of the arc-shaped opening and closing plate 19 is fixedly connected with a fixing ring 20. Two fixing rings 20 are provided on one side of each arc-shaped opening and closing plate 19 and they are distributed in a vertical array. The inner side of the four arc-shaped opening and closing plates 19 is provided with a spraying component 21.

[0028] The spraying assembly 21 includes branch pipes 22, four of which are evenly distributed in a circumferential array. Each branch pipe 22 is fixedly connected to the inner side of the fixing ring 20. The lower end of each branch pipe 22 is fixedly connected to a telescopic hose 24. The telescopic hose 24 facilitates the outward expansion of the branch pipe 22 while ensuring the stability of the conveying pipe 25. The lower end of the telescopic hose 24 is provided with a conveying pipe 25. The upper end of the conveying pipe 25 is fixedly connected to a discharge pipe 29. The interior of the discharge pipe 29 is interconnected with the interior of the conveying pipe 25. The interiors of the four branch pipes 22 are interconnected with the interiors of the conveying pipes 25. Spray nozzles 23 are fixedly connected to the upper ends of the four branch pipes 22 and the discharge pipe 29.

[0029] A push rod 27 is fixedly connected to the outside of the feed pipe 25. A push plate 26 is fixedly connected to one end of the push rod 27. Two push plates 26 are provided and are symmetrically distributed. A limit ring 28 is fixedly connected to the inside of the ejector rod 13. The feed pipe 25 is movably connected to the inside of the limit ring 28. When the arc-shaped opening and closing plate 19 is opened, as the ejector rod 13 continues to rise, the push plate 26 will push the feed pipe 25 to move upward. The feed pipe 25 drives the telescopic hose 24 and the branch pipe 22 to expand together, so that the spray nozzle 23 is close to the injection cavity. At this time, the release agent or other required liquid is delivered to the branch pipe 22 and the discharge pipe 29 through the feed pipe 25 through the external feeding system, and then evenly sprayed on the surface of the injection cavity through the spray nozzle 23 to achieve assisted demolding and prevent the injection molded product from sticking to the mold when it is removed.

[0030] A second torsion spring 30 is fixedly connected to one end of the arc-shaped opening and closing plate 19. A second arc-shaped groove 31 is formed on one side surface of the arc-shaped opening and closing plate 19. A second arc-shaped plate 32 is fixedly connected to the outside of the ejector rod 13. Four second arc-shaped plates 32 are arranged in a circumferential array and evenly distributed. A second placement groove 33 is formed on one side of the second arc-shaped plate 32. One end of the second torsion spring 30 is fixedly connected to the inside of the second placement groove 33. The second arc-shaped groove 31 and the second arc-shaped plate 32 are mutually adapted. During the injection molding process, the arc-shaped opening and closing plate 19 remains closed, forming a relatively closed space to protect the internal spraying component 21 from external interference. When demolding, after the ejector rod 13 rises and ejects the injection molded product, the arc-shaped opening and closing plate 19 will open due to the elastic force of the second torsion spring 30, preparing for the subsequent spraying operation.

[0031] A punch 5 is fixedly connected to one side of the moving mold 2, an injection port 4 is provided on one side of the moving mold 2, a guide post 7 is fixedly connected to one side of the moving mold 2, and a guide groove 8 is provided on one side of the fixed mold 3. The guide post 7 and the guide groove 8 are mutually adapted. Through the cooperation of the guide post 7 and the guide groove 8, the precise alignment of the moving mold 2 and the fixed mold 3 is achieved. A positioning plate 9 is fixedly connected to one side of the fixed mold 3. Two positioning plates 9 are provided and are symmetrically distributed. The positioning plates 9 can further enhance the stability of the moving mold 2 and the fixed mold 3 when the mold is closed and prevent the displacement or misalignment during the injection process.

[0032] During the operation of the overall injection mold, the moving mold 2 and the fixed mold 3 are precisely aligned through the guide pillars 7 and guide grooves 8, and the positioning plate 9 enhances the mold closing stability. Then, the molten plastic is injected from the injection port 4 into the cavity formed by the punch 5 and the die 6 to complete the injection molding process. During injection, the ejector plate 14 of the ejector assembly 11 closes under the action of the first torsion spring 15 to prevent the molten plastic from entering, and the arc-shaped plate 19 closes to protect the internal spraying assembly 21. During demolding, the ejector rod 13 rises, driving the ejector frame 12 to eject the product. The ejector rod 13 continues to rise, causing the internal components to push open the ejector plate 14. At the same time, the arc-shaped ejector plate 19 opens using the elastic force of the second torsion spring 30. Then, the push plate 26 pushes the feed pipe 25, causing the telescopic hose 24 and branch pipe 22 to deflect and expand outward, allowing the spray nozzle 23 to approach the injection cavity. The external feeding system sprays the release agent and other liquids evenly onto the surface through the feed pipe 25, branch pipe 22 and discharge pipe 29 from the spray nozzle 23 to assist in demolding and prevent the product from sticking to the mold during the next injection demolding.

[0033] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0034] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. An injection mold for easy demolding, comprising a base plate (1), characterized in that: A movable mold (2) is provided at the upper end of the placement base plate (1), and a fixed mold (3) is provided on one side of the movable mold (2). The fixed mold (3) is movably connected to the upper end of the placement base plate (1). A concave mold (6) is fixedly connected to the inner side of the fixed mold (3). An injection groove (10) is provided on one side of the concave mold (6). An ejection assembly (11) is provided at the lower end of the injection groove (10). The ejection assembly (11) includes an ejection frame (12). An ejection rod (13) is fixedly connected to one end of the ejection frame (12). An ejection opening and closing plate (14) is movably connected to the upper end of the ejection frame (12). There are two ejection opening and closing plates (14). A first torsion spring (15) is fixedly connected to one end of the ejection opening and closing plate (14).

2. The injection mold for easy demolding according to claim 1, characterized in that: One end of the ejector frame (12) is provided with a first placement groove (16), one end of the first torsion spring (15) is fixedly connected to the inner side of the first placement groove (16), and a first arc plate (17) is fixedly connected to one side surface of the ejector frame (12). There are two first arc plates (17) arranged symmetrically, and there are two ejector opening and closing plates (14). One side surface of each of the two ejector opening and closing plates (14) is provided with a first arc groove (18).

3. The injection mold for easy demolding according to claim 2, characterized in that: The outer side of the ejector frame (12) is provided with an arc-shaped opening and closing plate (19). There are four arc-shaped opening and closing plates (19) evenly distributed in a circumferential array. The inner side of the arc-shaped opening and closing plate (19) is fixedly connected with a fixing ring (20). Two fixing rings (20) are provided on one side of one arc-shaped opening and closing plate (19) and are distributed in a vertical array. The inner side of the four arc-shaped opening and closing plates (19) is provided with a spraying assembly (21).

4. The injection mold for easy demolding according to claim 3, characterized in that: The spraying assembly (21) includes branch pipes (22), four of which are evenly distributed in a circumferential array. Each branch pipe (22) is fixedly connected to the inner side of the fixing ring (20). A telescopic hose (24) is fixedly connected to the lower end of each branch pipe (22). A feed pipe (25) is provided at the lower end of the telescopic hose (24). A discharge pipe (29) is fixedly connected to the upper end of the feed pipe (25). The interior of the discharge pipe (29) is interconnected with the interior of the feed pipe (25). The interiors of the four branch pipes (22) are interconnected with the interiors of the feed pipes (25). Spray nozzles (23) are fixedly connected to the upper ends of the four branch pipes (22) and the discharge pipe (29).

5. The injection mold for easy demolding according to claim 4, characterized in that: A push rod (27) is fixedly connected to the outside of the feed pipe (25), and a push plate (26) is fixedly connected to one end of the push rod (27). There are two push plates (26) arranged symmetrically. A limit ring (28) is fixedly connected to the inside of the ejector rod (13), and the feed pipe (25) is movably connected to the inside of the limit ring (28).

6. The injection mold for easy demolding according to claim 5, characterized in that: One end of the arc-shaped opening and closing plate (19) is fixedly connected to a second torsion spring (30). A second arc-shaped groove (31) is provided on one side surface of the arc-shaped opening and closing plate (19). A second arc-shaped plate (32) is fixedly connected to the outside of the ejector rod (13). Four second arc-shaped plates (32) are provided and are evenly distributed in a circumferential array. A second placement groove (33) is provided on one side of the second arc-shaped plate (32). One end of the second torsion spring (30) is fixedly connected to the inside of the second placement groove (33). The second arc-shaped groove (31) and the second arc-shaped plate (32) are mutually adapted.

7. The injection mold for easy demolding according to claim 1, characterized in that: A punch (5) is fixedly connected to one side of the moving mold (2), an injection port (4) is provided on one side of the moving mold (2), a guide post (7) is fixedly connected to one side of the moving mold (2), a guide groove (8) is provided on one side of the fixed mold (3), the guide post (7) and the guide groove (8) are mutually adapted, and a positioning plate (9) is fixedly connected to one side of the fixed mold (3). There are two positioning plates (9) and they are symmetrically distributed.

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