Air ejection mechanism of injection mold

Abstract

The utility model discloses an injection mold gas cap mechanism which comprises a main body and a movable part, an axial through type center hole and gas inlet holes which are circumferentially distributed by taking the center hole as the center are formed in the main body, a conical surface opening is formed in the upper part of the main body, and the movable part is movably connected in the center hole of the main body. The upper part of the movable part is provided with a plugging raised head matched with the conical surface opening, the lower part of the movable part is provided with a limiting sleeve, the periphery of the movable part is sleeved with a reset spring, the upper end of the reset spring abuts against the main body, and the lower end of the reset spring abuts against the limiting sleeve; when gas enters from the lower portion of the main body and reaches the upper section of the main body through the gas inlet holes, the movable part is pushed by gas pressure to move upwards, so that the blocking protruding head is separated from the conical surface opening to form a gas flow gap channel, the gas inlet holes which are evenly distributed are designed in the main body, and gas thrust borne by the movable part is distributed more evenly through the gas inlet holes. And the movable part is kept stable and vertically moves upwards.

Description

Technical Field

[0001] This utility model relates to the field of mold technology, specifically to an air ejector mechanism for injection molds. Background Technology

[0002] Air ejector mechanisms are used in high-pressure, high-speed injection molds to support injection pressure loads and prevent air ejector blockage. Existing air ejector mechanisms have the following drawbacks: 1. Insufficient airflow control precision: Uneven distribution of air inlets, a single gas flow path, and insufficient airflow thrust in existing mechanisms lead to uneven internal air pressure distribution, resulting in unconcentrated air pressure thrust and affecting the vertical movement of moving parts; 2. Lack of limiting structures for moving parts; 3. Inadequate gas filtration structure: Existing air ejector mechanisms lack filtration for gas impurities. Particulate matter entering the mechanism can affect its normal operation, impacting airflow pressure and increasing the risk of moving parts jamming. Utility Model Content

[0003] To address the shortcomings of existing technologies, this utility model provides an air ejection mechanism for injection molds, which uses gas pressure to assist in ejecting products during the injection molding process, and is particularly suitable for complex demolding scenarios.

[0004] To achieve the above objectives, the air ejector mechanism of this injection mold is implemented through the following technical solution:

[0005] An injection mold air ejector mechanism includes a main body and a movable component. The main body has an axially penetrating central hole and air inlets distributed circumferentially around the central hole. The upper part of the main body has a conical opening. The movable component is movably connected to the central hole of the main body. The upper part of the movable component has a sealing protrusion that mates with the conical opening. The lower part of the movable component has a limiting sleeve. A return spring is fitted around the outer periphery of the movable component. The upper end of the return spring abuts against the main body, and the lower end of the return spring abuts against the limiting sleeve. When gas enters from the lower part of the main body and reaches the upper part of the main body through the air inlets, the movable component is pushed upward by the gas pressure, causing the sealing protrusion to separate from the conical opening and form an airflow gap channel.

[0006] Furthermore, the cone angle of the cone opening of the main body is 30°-60°, and the sealing protrusion of the movable part has a matching cone angle.

[0007] Furthermore, a 0.1-0.1mm fitting gap is reserved between the movable part and the inner wall of the central hole of the main body.

[0008] Furthermore, the outer peripheral surface of the main body is provided with corresponding limiting grooves, and the movable part and the limiting sleeve are respectively provided with a set of pin holes. A pin is provided, and the pin passes through the limiting groove and is inserted into the pin hole to form a limiting mechanism for the upper and lower strokes of the movable part.

[0009] Furthermore, the outer periphery of the main body is provided with an annular groove, and a rubber ring is provided in the annular groove, the outer diameter of the rubber ring being larger than the outer diameter of the main body.

[0010] Furthermore, the lower end of the main body is provided with an annular groove, in which a filter screen and a gasket are installed in sequence, and the gasket is used to fix the filter screen by snap-fit ​​or threaded connection.

[0011] Furthermore, the top of the main body is provided with several fasteners, which are screws or locating pins, used to fix the main body inside the injection mold core.

[0012] Compared with the prior art, the present invention has the following beneficial effects:

[0013] A gas ejector mechanism for injection molds is provided, comprising a main body and a movable component. The main body has an axially through-hole and a series of air inlets circumferentially distributed around the central hole. The upper part of the main body has a conical opening. The movable component is movably connected to the central hole of the main body. The upper part of the movable component has a sealing protrusion that mates with the conical opening. The lower part of the movable component has a limiting sleeve. A return spring is fitted around the outer periphery of the movable component. The upper end of the return spring abuts against the main body, and the lower end of the return spring abuts against the limiting sleeve. When gas enters from the lower part of the main body and reaches the upper part of the main body through the air inlets, the movable component is pushed upward by the gas pressure, forming an airflow gap channel between the sealing protrusion and the conical opening. Through the matching design of the conical opening and the sealing protrusion, the airflow gap channel is formed, making the gas pressure distribution more stable and the demolding force more uniform. Furthermore, several evenly distributed air inlets are designed inside the main body, which makes the gas thrust on the movable component more evenly distributed, allowing the movable component to maintain stable and vertically upward displacement.

[0014] This injection mold air ejector mechanism significantly improves the airflow uniformity and anti-jamming ability of the air ejector mechanism through designs such as conical airflow control, precision clearance fit, self-cleaning filtration and modular installation, while reducing maintenance costs. It is suitable for demolding scenarios of injection molded products with high precision and complex structures. Attached Figure Description

[0015] Figure 1 The diagram shown is a three-dimensional structural diagram of this air-cushion mechanism;

[0016] Figure 2 The diagram shown is an exploded assembly structure diagram of this air-cushion mechanism;

[0017] Figure 3 The diagram shown is a cross-sectional view of the air-cushion mechanism.

[0018] Figure 4 The diagram shown is a top view of the main body.

[0019] Figure 5 The diagram shown is a cross-sectional view of the gas ejector mechanism in the mold closing state.

[0020] Figure 6 The diagram shown is a cross-sectional view of the ejection state of this air ejection mechanism.

[0021] In the diagram: 1. Main body; 2. Moving part; 3. Limiting sleeve; 4. Return spring; 5. Pin; 6. Rubber ring; 7. Filter screen; 8. Gasket; 9. Fastener; 10. Airflow gap channel; 11. Center hole; 12. Air inlet; 13. Conical opening; 14. Limiting groove; 15. Annular groove; 16. Annular slot; 17. Mold core; 18. Air inlet; 19. Thread; 21. Sealing protrusion; 22. Pin hole; 31. Pin hole. Detailed Implementation

[0022] 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.

[0023] See Figure 1-6 As shown, this utility model provides a technical solution: an air ejector mechanism for an injection mold, comprising a main body 1 and a movable part 2. The main body 1 has an axially penetrating central hole 11 and air inlets 12 distributed circumferentially around the central hole 11. The upper part of the main body 1 has a conical opening 13. The movable part 2 is movably connected to the central hole 11 of the main body 1. The upper part of the movable part 2 has a sealing protrusion 21 that cooperates with the conical opening 13. The lower part of the movable part 2 has a limiting sleeve 3. A return spring 4 is sleeved on the outer periphery of the movable part 2. The upper end of the return spring 4 abuts against the main body 1, and the lower end of the return spring 4 abuts against the limiting sleeve 3. Set 3 and return spring 4 provide stable rebound force; when gas enters from the lower part of the main body 1 and reaches the upper part of the main body 1 through the air inlet 12, the moving part 2 is pushed upward by the gas pressure, so that the airflow gap channel 10 is formed between the sealing protrusion 21 and the conical opening 13. Through the matching design of the conical opening 13 and the sealing protrusion 21, the airflow gap channel is formed, making the gas pressure distribution more stable and the demolding force more uniform. In addition, several evenly distributed air inlets 12 are designed inside the main body 1. Through several air inlets 12, the gas thrust of the moving part 2 is more evenly distributed, allowing the moving part 2 to maintain stable and vertical upward displacement.

[0024] See Figure 2-3As shown, the cone angle of the cone opening 13 of the main body 1 is 30°-60°, and the sealing protrusion 21 of the movable part 2 has a matching cone angle. Through the above design, a uniform airflow gap channel is formed, making the gas pressure distribution more stable and the demolding force more uniform. At the same time, the cone angle design can reduce airflow resistance, increase gas flow rate by 20%-30%, and shorten demolding time.

[0025] A 0.1-0.1mm clearance is reserved between the movable part 2 and the inner wall of the center hole 11 of the main body 1. The clearance ensures that the movable part 2 can move flexibly.

[0026] See Figure 3 As shown, the outer circumferential surface of the main body 1 is provided with opposing limiting grooves 14. The movable part 2 and the limiting sleeve 3 are respectively provided with a set of pin holes (22, 31). A pin 5 is provided, which passes through the limiting groove 14 and is inserted into the pin hole (22, 31) to form a limiting mechanism for the upper and lower strokes of the movable part 2. The pin limiting mechanism prevents the movable part 2 from overtravel and reduces fatigue damage to the return spring 4. It should be noted that, since the outer circumferential surface of the main body 1 is provided with opposing limiting grooves 14, gas will flow out from the limiting grooves 14 to the outside of the main body 1. Although this gas ejection mechanism is located inside the mold core 17, the mold core 17 can provide a relatively closed space for the entire gas ejection mechanism, so that the upward displacement of the movable part 2 by the gas thrust will not be affected due to gas leakage. To further improve the gas sealing performance of this gas-operated mechanism, a matching sealing colloid is provided in the limiting groove 14. The sealing colloid seals and blocks the limiting groove 14, preventing gas from flowing out through the limiting groove 14 and further concentrating the gas force onto the moving part 2.

[0027] The outer periphery of the main body 1 is provided with an annular groove 15, and a rubber ring 6 is provided inside the annular groove 15. The outer diameter of the rubber ring 6 is larger than the outer diameter of the main body 1. The purpose of setting the rubber ring 6 is to prevent the main body 1 from rotating.

[0028] The lower end of the main body 1 is provided with an annular groove 16. A filter screen 7 and a gasket 8 are installed in sequence in the annular groove 16. The gasket 8 fixes the filter screen 7 by snap-fit ​​or threaded connection. By designing the filter screen 7, it is prevented that the gas will carry particulate matter into the air top mechanism and affect the normal operation of the air top mechanism.

[0029] See Figure 2-6 As shown, the top of the main body 1 is provided with several fasteners 9, which are screws or positioning pins, used to fix the main body 1 inside the mold core 17. In addition, the lower outer shaft surface of the main body 1 is provided with threads 19, and the lower end of the main body 1 is fixed to the mold core 17 by means of threads. With the combination of several fasteners 9 on the top, the distribution of multiple fastening points improves the installation stability by 50%, avoids the displacement of the air ejector mechanism, and can realize quick disassembly and assembly, improving maintenance efficiency by 30%.

[0030] Working principle: The air ejection mechanism is fixed to the injection mold core 17 by fasteners 9. During injection molding, high-pressure gas enters from the lower part of the main body 1 through the air inlet 18 of the mold core 17, and diffuses evenly to the upper part of the main body 1 through the air inlet 12, pushing the movable part 2 upward. This causes the sealing protrusion 21 to separate from the conical opening 13, forming an airflow gap channel 10. Gas is injected into the mold cavity through this gap to complete the ejection action. After demolding, the gas pressure is released, and the movable part 2 returns to its original position under the action of the return spring 4, allowing the sealing protrusion 21 to reseal the conical opening 13.

Claims

1. An injection mold gas knockout mechanism characterized by, The device includes a main body (1) and a movable part (2). The main body (1) has an axially through-type central hole (11) and an air inlet (12) distributed circumferentially around the central hole (11). The upper part of the main body (1) has a conical opening (13). The movable part (2) is movably connected to the central hole (11) of the main body (1). The upper part of the movable part (2) has a sealing protrusion (21) that cooperates with the conical opening (13). The lower part of the movable part (2) has a limiting sleeve (3). The outer periphery of the movable part (2) is fitted with a return spring (4). The upper end of the return spring (4) abuts against the main body (1), and the lower end of the return spring (4) abuts against the limiting sleeve (3). When gas enters from the lower part of the main body (1) and reaches the upper part of the main body (1) through the air inlet (12), the movable part (2) is pushed upward by the gas pressure, causing the sealing protrusion (21) to separate from the conical opening (13) to form an airflow gap channel.

2. The gas lift mechanism for injection molds of claim 1, wherein, The cone angle of the cone opening (13) of the main body (1) is 30°-60°, and the sealing protrusion (21) of the movable part (2) has a matching cone angle.

3. The gas assist injection mold apparatus of claim 2, wherein, A 0.1-0.1mm fitting gap is reserved between the movable part (2) and the inner wall of the center hole (11) of the main body (1).

4. The gas assist injection mold apparatus of claim 1, wherein, The outer peripheral surface of the main body (1) is provided with a corresponding limiting groove (14). The movable part (2) and the limiting sleeve (3) are respectively provided with a set of pin holes (22,31). A pin (5) is provided, and the pin (5) passes through the limiting groove (14) and is inserted into the pin hole (22,31) to form a limit mechanism for the upper and lower stroke of the movable part (2).

5. The gas assist injection mold apparatus of claim 1, wherein, The outer periphery of the main body (1) is provided with an annular groove (15), and a rubber ring (6) is provided inside the annular groove (15). The outer diameter of the rubber ring (6) is larger than the outer diameter of the main body (1).

6. The gas assist mechanism for injection molds of claim 1, wherein, The lower end of the main body (1) is provided with an annular groove (16), and a filter screen (7) and a gasket (8) are installed in the annular groove (16) in sequence. The gasket (8) fixes the filter screen (7) by snap-fit ​​or threaded connection.

7. The gas assist injection mold apparatus of claim 1, wherein, The top of the main body (1) is provided with several fasteners (9), which are screws or positioning pins, used to fix the main body (1) inside the injection mold core (17).

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