Injection mold facilitating strong demolding of plastic parts

Abstract

The application discloses a plastic injection mold facilitating strong demolding of a plastic part, and relates to the technical field of injection molding. The plastic injection mold comprises a fixed mold and a movable mold, the movable mold is internally slidably provided with a first top plate and a second top plate, the first top plate is provided with a top rod, the second top plate is provided with a connecting rod, the connecting rod is provided with a push plate, and the movable mold is internally provided with an ejection mechanism. The ejection mechanism is utilized, when the plastic part is completed injection molding, the ejection mechanism first drives the first top plate and the second top plate to jointly move, the first top plate drives the top rod to move upwards, the second top plate drives the push plate to move upwards through the connecting rod, the top rod moves upwards and pushes the plastic part to preliminarily separate from the mold, then the ejection mechanism drives the second top plate to separately move, the second top plate drives the push plate to move upwards through the connecting rod, the push plate moves to abut against the outside of the plastic part, and the plastic part is secondarily ejected, thereby facilitating demolding of the plastic part.

Description

Technical Field

[0001] This application relates to the field of injection molding technology, and in particular to an injection mold that facilitates strong demolding of plastic parts. Background Technology

[0002] Plastic injection molding is a process in which thermoplastic granules are heated and melted, then injected under high pressure into a closed, precision injection mold cavity. After cooling and solidification, the molded product is ejected. Its advantages include extremely high efficiency, high precision, the ability to mold complex shapes, and a high degree of automation. It is widely used in the manufacture of various plastic components for daily necessities, electronic product casings, automotive parts, medical devices, and other products, and is a fundamental process in manufacturing.

[0003] Currently, referring to Figure 7 The plastic part 20 is formed by injection molding, and its bottom has a pre-set annular groove 21. After the injection molding process is completed, due to the large depth of this annular groove 21, the friction between the groove 21 and the mold cavity wall is significantly increased during the demolding process, which hinders the smooth demolding of the plastic part 20 and is not conducive to the efficient completion of the demolding process. Utility Model Content

[0004] To facilitate the demolding of plastic parts, this application provides an injection mold that facilitates strong demolding of plastic parts.

[0005] The injection mold for easy demolding of plastic parts provided in this application adopts the following technical solution:

[0006] An injection mold for easy demolding of plastic parts includes a fixed mold and a moving mold. The plastic part is located on the moving mold. A first ejector plate and a second ejector plate are slidably disposed within the moving mold. An ejector rod is disposed on the first ejector plate, and the top end of the ejector rod abuts against the interior of the plastic part. A connecting rod is disposed on the second ejector plate, and a push plate is disposed on the connecting rod. The push plate moves to abut against the exterior of the plastic part. An ejection mechanism is disposed within the moving mold. The ejection mechanism first drives the first ejector plate and the second ejector plate to move together, and then drives the second ejector plate to move independently.

[0007] By adopting the above technical solution, after the plastic part is injection molded, the ejection mechanism first drives the first ejector plate and the second ejector plate to move together. The first ejector plate drives the ejector rod to move upward. The second ejector plate drives the push plate to move upward through the connecting rod. After the ejector rod moves upward, it pushes the plastic part to initially separate from the mold. Then, the ejection mechanism drives the second ejector plate to move alone. The second ejector plate drives the push plate to move upward through the connecting rod. The push plate moves and abuts against the outside of the plastic part, thereby ejecting the plastic part a second time, which facilitates demolding of the plastic part.

[0008] Preferably, the ejection mechanism includes an outer sleeve, an inner slide rod, and a push ring. The outer sleeve is slidably disposed within the moving mold and abuts against a first top plate. The inner slide rod is slidably disposed within the outer sleeve. A limiting ring platform is formed on the side wall of the inner slide rod and abuts against the top of the outer sleeve. The push ring is disposed on the inner slide rod and located at the top of the limiting ring platform away from the outer sleeve, and abuts against a second top plate.

[0009] By adopting the above technical solution, the driving component first drives the outer sleeve to move, the outer sleeve drives the first top plate to move, and at the same time the outer sleeve drives the inner slide rod to move through the limiting ring platform, the inner slide rod drives the push ring to move, the push ring drives the second top plate to move, and the driving component drives the inner slide rod to move. At this time, the outer sleeve will not move, and the inner slide rod drives the second top plate to move independently through the push ring, so as to realize the secondary ejection of the plastic part.

[0010] Preferably, a core top is fixedly disposed in the fixed mold, a core block is slidably disposed in the moving mold, a core sleeve is fixedly disposed in the moving mold, and an ejector rod is slidably disposed through the core sleeve. The core top, core block, core sleeve, and ejector rod together form an injection molding cavity.

[0011] By adopting the above technical solution, the core top, core block, core sleeve and ejector rod together form the injection cavity. When the moving mold is opened, the moving mold drives the plastic part to separate from the core top, and then the moving mold drives the core block to separate from the plastic part, which facilitates the secondary ejection of the plastic part.

[0012] Preferably, a movable block is slidably disposed on the moving mold, a drive rod is fixedly disposed at the bottom of the fixed mold, the drive rod is inclined, the drive rod slidably passes through the movable block, and the core block is fixedly disposed inside the movable block.

[0013] By adopting the above technical solution, when the moving mold is opened, the moving mold drives the moving block to move on the drive rod, the drive rod drives the moving block to move, and the moving block drives the core block to move, thereby separating the core block from the plastic part.

[0014] Preferably, a guide rod is fixedly provided inside the moving mold, and the guide rod is slidably inserted into the moving block along the moving direction of the moving block.

[0015] By adopting the above technical solution, when the drive rod moves the moving block, the guide rod guides the movement of the moving block, thereby making the movement of the moving block more stable.

[0016] Preferably, the core block has cooling channels.

[0017] By adopting the above technical solution, during the injection molding process, the cooling medium flows through the cooling channel, and the cooling medium cools the injection molded product through the core block, thereby facilitating the rapid curing of the injection molded product.

[0018] Preferably, a fixing sleeve is provided on the side wall of both the fixed mold and the moving mold, and a fixing rod is provided on the two fixing sleeves. A fixing member is provided at both ends of the fixing rod, and the two fixing members pass through the two fixing sleeves and are fixed in the fixed mold and the moving mold respectively.

[0019] By adopting the above technical solution, after the injection mold is closed, a fixing rod is installed on the fixed mold and the moving mold using a fixing component. The fixing rod reinforces the fixed mold and the moving mold, making it less likely for the mold to loosen during the injection process.

[0020] In summary, this application includes at least one of the following beneficial technical effects:

[0021] 1. Using the ejection mechanism, after the plastic part is injection molded, the ejection mechanism first drives the first ejector plate and the second ejector plate to move together. The first ejector plate drives the ejector rod to move upward. The second ejector plate drives the push plate to move upward through the connecting rod. After the ejector rod moves upward, it pushes the plastic part to initially separate from the mold. Then the ejection mechanism drives the second ejector plate to move alone. The second ejector plate drives the push plate to move upward through the connecting rod. The push plate moves and abuts against the outside of the plastic part, thereby ejecting the plastic part a second time, which facilitates demolding of the plastic part.

[0022] 2. With the help of the outer sleeve, inner slide rod and push ring, the driving component first drives the outer sleeve to move, the outer sleeve drives the first top plate to move, and at the same time the outer sleeve drives the inner slide rod to move through the limiting ring platform, the inner slide rod drives the push ring to move, the push ring drives the second top plate to move, the driving component drives the inner slide rod to move, at this time the outer sleeve will not move, the inner slide rod drives the second top plate to move independently through the push ring, realizing the secondary ejection of the plastic part;

[0023] 3. When the moving mold is opened, the moving mold drives the moving block to move on the driving rod, the driving rod drives the moving block to move, and the moving block drives the core block to move, thereby separating the core block from the plastic part. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the overall structure of the injection mold of this application;

[0025] Figure 2 This is a cross-sectional view of the overall structure of the injection mold of this application;

[0026] Figure 3 For this application Figure 2 Enlarged view of point A in the middle;

[0027] Figure 4 This is a cross-sectional view of the overall structure of the injection mold of this application;

[0028] Figure 5 For this application Figure 4 Enlarged view of point B in the middle;

[0029] Figure 6 This is a partial structural diagram of the injection mold of this application;

[0030] Figure 7 This is a schematic diagram of the structure of a plastic part in the background art of this application.

[0031] Reference numerals: 1. Fixed mold; 2. Moving mold; 3. First ejector plate; 4. Second ejector plate; 5. Ejector rod; 6. Connecting rod; 7. Push plate; 8. Ejection mechanism; 81. Outer sleeve; 82. Inner slide rod; 83. Push ring; 9. Limiting ring platform; 10. Core top; 11. Core block; 12. Core sleeve; 13. Moving block; 14. Drive rod; 15. Guide rod; 16. Cooling channel; 17. Fixing sleeve; 18. Fixing rod; 19. Fixing component; 20. Plastic part; 21. Groove. Detailed Implementation

[0032] The following is in conjunction with the appendix Figures 1-6 This application will be described in further detail.

[0033] This application discloses an injection mold that facilitates strong demolding of plastic parts.

[0034] Reference Figure 1 and Figure 2 An injection mold for facilitating strong demolding of plastic parts includes a fixed mold 1 and a movable mold 2. The fixed mold 1 is mounted above the movable mold 2. A fixing rod 18 is installed on one side of both the fixed mold 1 and the movable mold 2. Fixing members 19 are installed at both ends of the fixing rod 18. Fixing sleeves 17 are fitted onto each of the two fixing members 19. The two fixing members 19 are threaded into the fixed mold 1 and the movable mold 2, and the two fixing sleeves 17 abut against the side walls of the fixed mold 1 and the movable mold 2, respectively. In this application, the fixing members 19 can be bolts.

[0035] After the injection mold completes the mold closing action, the fixing rod 18 is precisely assembled into the corresponding installation positions of the fixed mold 1 and the moving mold 2 using the fixing component 19. The fixing rod 18 can effectively reinforce the fixed mold 1 and the moving mold 2, significantly improving the overall structural rigidity of the mold. In the subsequent injection molding process, even if the inside of the mold is subjected to high-pressure impact from the molten plastic, relative displacement or loosening between the fixed mold 1 and the moving mold 2 can be avoided to the greatest extent, thus providing a strong guarantee for the stability and reliability of injection molding production.

[0036] Reference Figure 2 , Figure 3 , Figure 4 , Figure 5 and Figure 6The moving mold 2 has four injection stations, and a core sleeve 12 is fixedly installed at each of the four injection stations. The bottom of the fixed mold 1 has four core tops 10, which correspond one-to-one with the four core sleeves 12. Two moving blocks 13 are symmetrically slidably installed on the moving mold 2, and a core block 11 is fixedly installed on the side of the two moving blocks 13 that is close to each other.

[0037] Four drive rods 14 are symmetrically fixedly installed on the bottom wall of the fixed mold 1. The bottoms of the four drive rods 14 are inclined in a direction away from each other, and a moving block 13 is slidably inserted between every two drive rods 14 along their own inclined direction. Four guide rods 15 are symmetrically fixedly installed inside the moving mold 2. The guide rods 15 are installed along the moving direction of the moving block 13, and every two guide rods 15 are slidably inserted into a moving block 13.

[0038] When the moving mold 2 moves downward, it drives two moving blocks 13 to move upward via four drive rods 14. The four drive rods 14 then drive the two moving blocks 13 to move away from each other, and the two moving blocks 13 in turn drive the two core blocks 11 to separate. Similarly, when the moving mold 2 moves upward, the drive rods 14 drive the two core blocks 11 to merge via the moving blocks 13.

[0039] A first top plate 3 is slidably mounted within the moving mold 2. The first top plate 3 is composed of two plates fixedly connected together. Four ejector rods 5 are fixedly mounted within the first top plate 3. The four ejector rods 5 slide through four core sleeves 12 respectively, and the tops of the four ejector rods 5 abut against the bottoms of four core tops 10. The core tops 10, core blocks 11, core sleeves 12, and ejector rods 5 together form an injection molding cavity, and the tops of the core sleeves 12 are inserted into the grooves 21 of the plastic part 20. A cooling channel 16 is provided inside the core block 11. During the injection molding process, molten plastic is injected into the injection molding cavity through the core tops 10. Cooling medium flows through the cooling channel 16, and the cooling medium cools the injection molded product through the core block 11, thereby facilitating rapid solidification of the injection molded product.

[0040] The moving mold 2 is slidably mounted above the first top plate 3, and the second top plate 4 is composed of two plates fixedly connected. The ejector rods 5 slide through the second top plate 4. Two connecting rods 6 are fixedly mounted on the top wall of the second top plate 4, and push plates 7 are fixedly mounted on the top ends of the two connecting rods 6. The four ejector rods 5 slide through the push plates 7, and the push plates 7 are located below the core plate.

[0041] An ejection mechanism 8 is installed inside the moving mold 2. The ejection mechanism 8 includes an outer sleeve 81, an inner slide rod 82, and a push ring 83. The outer sleeve 81 is slidably installed at the bottom of the moving mold 2 in a vertical direction, and the top of the outer sleeve 81 abuts against the bottom of the first top plate 3. The inner slide rod 82 is slidably installed inside the outer sleeve 81. A limiting ring platform 9 is integrally formed on the side wall of the inner slide rod 82. The push ring 83 is sleeved on the inner slide rod 82, and the bottom wall of the limiting ring platform 9 abuts against the top wall of the outer sleeve 81, while the top wall of the limiting ring platform 9 abuts against the bottom wall of the push ring 83.

[0042] The implementation principle of an injection mold for easy demolding of plastic parts according to an embodiment of this application is as follows: After the plastic part 20 is injection molded, the moving mold 2 moves downward, causing the four plastic parts 20 to separate from the four core ejectors 10. At the same time, the moving mold 2 causes two moving blocks 13 to move on four drive rods 14. The four drive rods 14 cause the two moving blocks 13 to move away from each other. The two moving blocks 13 then cause the two core blocks 11 to separate from the plastic parts 20. Subsequently, the drive component is activated, firstly causing the outer sleeve 81 to move upward. During the movement of the outer sleeve 81, the first ejector plate 3 moves synchronously. The first ejector plate 3 causes the ejector rod 5 to move upward. After the ejector rod 5 moves upward, it pushes the plastic parts 20 to initially separate from the mold. At the same time, the outer sleeve 81 causes the inner slide rod 82 to move in the same direction through the limiting ring 9 at its end. The inner slide rod 82 then pushes the push ring 83 to move. The push ring 83 further drives the second ejector plate 4 to move synchronously with the first ejector plate 3. The second ejector plate 4 drives the push plate 7 to move upward through the connecting rod 6. When the driving component enters the next action stage, the driving component drives the inner slide bar 82 to move upward, while the outer sleeve 81 remains stationary during this process. At this time, the inner slide bar 82 alone drives the second top plate 4 to move through the push ring 83. The second top plate 4 drives the push plate 7 to move upward through the connecting rod 6. The push plate 7 moves to abut against the outside of the plastic part 20, thereby ejecting the plastic part 20 a second time, which facilitates demolding of the plastic part 20.

[0043] The above are merely optional embodiments of this disclosure and are not intended to limit this disclosure. Various modifications and variations can be made to this disclosure by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this disclosure should be included within the scope of protection of this disclosure.

Claims

1. An injection mold that facilitates strong demolding of plastic parts, characterized in that: The system includes a fixed mold (1) and a moving mold (2). The plastic part (20) is located on the moving mold (2). A first top plate (3) and a second top plate (4) are slidably arranged inside the moving mold (2). A push rod (5) is provided on the first top plate (3). The top end of the push rod (5) abuts against the inside of the plastic part (20). A connecting rod (6) is provided on the second top plate (4). A push plate (7) is provided on the connecting rod (6). The push plate (7) moves to abut against the outside of the plastic part (20). An ejection mechanism (8) is provided inside the moving mold (2). The ejection mechanism (8) first drives the first top plate (3) and the second top plate (4) to move together, and then drives the second top plate (4) to move alone.

2. The injection mold for easy demolding of plastic parts according to claim 1, characterized in that: The ejection mechanism (8) includes an outer sleeve (81), an inner slide rod (82), and a push ring (83). The outer sleeve (81) is slidably disposed in the moving mold (2) and abuts against the first top plate (3). The inner slide rod (82) is slidably disposed in the outer sleeve (81). A limiting ring platform (9) is formed on the side wall of the inner slide rod (82). The limiting ring platform (9) abuts against the top of the outer sleeve (81). The push ring (83) is disposed on the inner slide rod (82) and located at the top of the limiting ring platform (9) away from the outer sleeve (81). The push ring (83) abuts against the second top plate (4).

3. The injection mold for easy demolding of plastic parts according to claim 1, characterized in that: A core top (10) is fixedly provided in the fixed mold (1), a core block (11) is slidably provided in the moving mold (2), a core sleeve (12) is fixedly provided in the moving mold (2), and an ejector rod (5) slidably passes through the core sleeve (12). The core top (10), core block (11), core sleeve (12) and ejector rod (5) together form an injection molding cavity.

4. The injection mold for easy demolding of plastic parts according to claim 3, characterized in that: A movable block (13) is slidably disposed on the moving mold (2), and a drive rod (14) is fixedly disposed at the bottom of the fixed mold (1). The drive rod (14) is inclined and slides through the movable block (13). The core block (11) is fixedly disposed inside the movable block (13).

5. The injection mold for easy demolding of plastic parts according to claim 4, characterized in that: A guide rod (15) is fixedly installed inside the moving mold (2), and the guide rod (15) is slidably inserted into the moving block (13) along the moving direction of the moving block (13).

6. The injection mold for easy demolding of plastic parts according to claim 3, characterized in that: Cooling channels (16) are provided inside the core block (11).

7. The injection mold for easy demolding of plastic parts according to claim 1, characterized in that: The fixed mold (1) and the moving mold (2) are each provided with a fixing sleeve (17), and a fixing rod (18) is provided on the two fixing sleeves (17). Both ends of the fixing rod (18) are provided with fixing parts (19). The two fixing parts (19) pass through the two fixing sleeves (17) and are fixed in the fixed mold (1) and the moving mold (2) respectively.

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