A thin-wall injection-molding special mold

Abstract

The utility model discloses a special mold for thin -walled injection moulding, including fixed mould seat, the fixed mould seat, including firm board, guide post, fixed template and movable template, ejection mechanism, the fixed template is fixed with the male die of the penetration movable template, the inside fixed connection of this male die has the support plate, the side surface of fixed template is opened to have the airflow channel, the outside surface of fixed template is penetrated to have the locating circular pipe, the movable of injection mould of the application has the auxiliary demoulding design that will be loose to the forming cup that holds on the movable core, and gas is injected into the gas storage circular box from the airflow channel, and the path delivery of gas delivery circular pipe, gas injection cylinder and gas injection mouth, and the lifting cylinder drives the support plate and the connecting column and the block head to move, and the gas that the gas injection mouth place spouts diffuses from the gap, and the gas that the gas injection mouth place spouts fills the gap between male die and the plastic cup that holds, makes the plastic cup that holds in the state of loosening, and it is favorable to stripping.

Description

Technical Field

[0001] This utility model belongs to the field of injection mold technology, and specifically relates to a thin-walled injection mold. Background Technology

[0002] Injection molds are an important tool in plastic molding. They are used to inject molten plastic into a mold cavity, which then cools and solidifies to obtain a plastic product that conforms to the shape of the cavity. Injection molds generally consist of two parts: a fixed mold and a moving mold. The fixed mold has a cavity, and the moving mold has a raised moving core. For example, when making a thin-walled plastic cup, the cavity is the part of the fixed mold that directly forms the shape of the thin-walled cup. Its outer surface is formed by the fixed mold cavity, and the internal space of the cup is formed by the moving core. After the product is formed, the mold is opened, and the ejection device, such as the top plate, ejects the product from the moving core under the power of the injection molding machine. The ejected plastic cup product falls off.

[0003] Traditional thin-walled plastic cups may crack or deform during demolding. Because of their thin walls, ejector pins can cause breakage. Furthermore, if the moving mold core and cavity do not cool sufficiently during molding, the cup may shrink and hold too tightly against the moving mold core. Improper ejection can lead to uneven stress and breakage. The design of thin-walled plastic cups, which do not loosen the cup from the moving mold core during demolding, needs improvement to facilitate smooth demolding.

[0004] Existing injection molds for manufacturing thin-walled cups have the problem that the moving mold lacks an auxiliary demolding design to loosen the molded cup held tightly on the moving mold core during the injection molding process. To address this issue, this application proposes a special mold for thin-walled injection molding. Utility Model Content

[0005] The purpose of this utility model is to provide a special mold for thin-walled injection molding, so as to solve the problem mentioned in the background art that the moving mold of the injection mold does not have an auxiliary demolding design to loosen the molded cup held on the moving mold core.

[0006] To achieve the above objectives, this utility model provides the following technical solution: a thin-walled injection mold, comprising...

[0007] Fixed mold base;

[0008] The moving mold base includes a stabilizing plate, guide pillars, a fixed template and a moving template, and an ejection mechanism. A punch that penetrates the moving template is fixed on the fixed template. A support plate is fixedly connected inside the punch. An airflow channel is opened on the side of the fixed template. A positioning round tube penetrates the outer surface of the fixed template.

[0009] The gas delivery assembly includes a gas storage box installed inside a fixed template, a gas delivery pipe communicating with the inside of the gas storage box, and a jet cylinder communicating with one end of the gas delivery pipe. The inner surface of the jet cylinder is provided with a jet nozzle.

[0010] The movable component includes a lifting cylinder fixed to the support plate by screws, a support plate welded to one end of the lifting cylinder, a connecting column vertical to the support plate, a sealing head fixedly connected to one end of the connecting column, and an air supply pipe that passes through the positioning round tube and is inserted into the fixed template.

[0011] Preferably, the ejection mechanism includes an ejection plate and a top column, the top end of the top column penetrates the fixed template and is embedded inside the moving template, and a buffer spring is sleeved on the outer side of the top column.

[0012] Preferably, the gas storage box has a gas storage cavity inside, and an air inlet pipe communicating with the gas storage cavity is provided on the outer surface of the gas storage box, with the air inlet pipe embedded inside the airflow channel.

[0013] Preferably, the jet cylinder is a hollow cone structure, and the interior of the jet cylinder is provided with a diversion air chamber D, and the gas delivery pipe is connected to the diversion air chamber D.

[0014] Preferably, the jet nozzle is inclined, the top of the punch is conical, and the conical surface on the outer side of the jet cylinder matches the inner surface of the cone end of the punch.

[0015] Preferably, the sealing head penetrates the center of the top of the punch, and the end of the sealing head near the connecting post has a conical structure.

[0016] Preferably, the fixed template has a placement groove B inside, the air storage box is located in the placement groove B, the punch has an installation groove C inside, the lifting cylinder is located in the installation groove C, the placement groove B and the installation groove C are connected, and one end of the air supply pipe inserted into the positioning tube passes through the support plate and is connected to the lifting cylinder.

[0017] Compared with the prior art, the beneficial effects of this utility model are:

[0018] 1. In this utility model, through the designed gas delivery component, an external gas source injects gas, which is then injected into the gas storage box from the airflow channel. The gas is transported along the path of the gas storage box, the gas delivery pipe, the jet cylinder, and the jet nozzle. The gas ejected from the jet nozzle fills the gap between the punch and the clamped plastic cup, so that the clamped plastic cup is in a loose state, which is conducive to demolding.

[0019] 2. In this utility model, through the designed moving component, the lifting cylinder drives the support plate, connecting column and sealing head to move, which facilitates the diffusion of the gas ejected from the jet nozzle from the gap. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the structure of this utility model;

[0021] Figure 2 This is a cross-sectional structural diagram of the fixed template and the movable template of this utility model;

[0022] Figure 3 For the present utility model Figure 2 Enlarged structural diagram of section A in the middle;

[0023] Figure 4 This is a three-dimensional structural diagram of the jet cylinder of this utility model;

[0024] Figure 5 This is a three-dimensional structural diagram of the gas storage round box of this utility model;

[0025] In the diagram: 1. Fixed mold base; 4. Airflow channel; 5. Positioning tube; 6. Air supply pipe; 8. Support plate; 10. Sealing head; 21. Stabilizing plate; 22. Guide column; 23. Fixed template; 24. Moving template; 25. Punch; 31. Ejector plate; 32. Ejector column; 71. Air storage box; 72. Air supply pipe; 73. Air jet cylinder; 74. Air jet nozzle; 91. Lifting cylinder; 92. Support plate; 93. Connecting column; 711. Air inlet pipe. Detailed Implementation

[0026] 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.

[0027] Please see Figures 1 to 5This utility model provides a technical solution: a thin-walled injection mold, including a fixed mold base 1; a movable mold base, including a stabilizing plate 21, a guide post 22, a fixed template 23 and a movable template 24, and an ejection mechanism. A punch 25 penetrating the movable template 24 is fixed on the fixed template 23. A support plate 8 is fixedly connected inside the punch 25. An airflow channel 4 is provided on the side of the fixed template 23. A positioning round tube 5 penetrates the outer surface of the fixed template 23. The fixed mold base 1 and the movable mold base are installed on a mold equipment. When the fixed mold base 1 and the movable mold base are closed, the cavity is... The fixed mold base 1 is the part that directly forms the shape of the thin-walled cup plastic product. The outer surface of the thin-walled cup is formed by the fixed mold cavity, and the internal space of the cup is formed by the punch 25. After the product is formed, the fixed mold base 1 and the moving mold base open. The ejection mechanism ejects the product from the punch 25 under the power of the injection molding machine. The ejected plastic cup product falls off. The airflow channel 4 is connected to an external air source. The air source supplies gas, and the gas enters the interior of the gas storage box 71 from the airflow channel 4. The gas supply assembly includes the gas storage box 71 installed inside the fixed mold plate 23 and the gas supply component that communicates with the interior of the gas storage box 71. The system includes an air supply pipe 72 and an air jet cylinder 73 connected to one end of the air supply pipe 72. The inner surface of the air jet cylinder 73 has an air jet port 74. When the fixed mold base 1 and the moving mold base open, an external air source injects gas into the air storage box 71 from the airflow channel 4. The gas is transported along the path of the air storage box 71, the air supply pipe 72, the air jet cylinder 73, and the air jet port 74. The gas ejected from the air jet port 74 fills the gap between the punch 25 and the clamped plastic cup, causing the clamped plastic cup to be in a loose state, facilitating demolding. The moving assembly includes components connected to the support plate 8 via screws... The lifting cylinder 91 is fixed by a wire, the support plate 92 is welded to one end of the lifting cylinder 91, the connecting column 93 is perpendicular to the support plate 92, the sealing head 10 is fixedly connected to one end of the connecting column 93, and the air supply pipe 6 passes through the positioning round pipe 5 and is inserted into the fixed template 23. When the fixed mold base 1 and the moving mold base open, the lifting cylinder 91 shortens under the action of air pressure. The lifting cylinder 91 drives the support plate 92, the connecting column 93 and the sealing head 10 to move, so that there is a gap between the sealing head 10 and the punch 25, which is conducive to the diffusion of the gas ejected from the air jet 74 from the gap.

[0028] In this embodiment, the ejection mechanism includes an ejection plate 31 and a top column 32. The top end of the top column 32 passes through the fixed template 23 and is embedded inside the movable template 24. A buffer spring is sleeved on the outside of the top column 32. When the ejection plate 31 and the top column 32 are subjected to external force, they move. The top column 32 presses against the movable template 24, causing the movable template 24 to move. The movable template 24 then causes the molded thin-walled plastic cup to fall off.

[0029] In this embodiment, the gas storage box 71 has a gas storage cavity inside, and an air inlet pipe 711 communicating with the gas storage cavity is provided on the outer surface of the gas storage box 71. The air inlet pipe 711 is embedded inside the airflow channel 4. The jet cylinder 73 is a hollow conical structure. The jet cylinder 73 has a diversion air cavity D inside, and the gas delivery pipe 72 communicates with the diversion air cavity D. The jet nozzle 74 is inclined. The top of the punch 25 is conical. The conical surface on the outer side of the jet cylinder 73 matches the inner surface of the conical end of the punch 25. An external gas source injects gas into the gas storage box 71 from the airflow channel 4. The gas is transported along the path of the gas storage box 71, the gas delivery pipe 72, the jet cylinder 73 and the jet nozzle 74. The gas ejected from the jet nozzle 74 fills the gap between the punch 25 and the clamped plastic cup, so that the clamped plastic cup is in a loose state, which is conducive to demolding.

[0030] In this embodiment, the sealing head 10 penetrates the center of the top of the punch 25. The end of the sealing head 10 near the connecting post 93 is a conical structure. The sealing head 10 is tightly fitted with the punch 25. The molten plastic is formed on the outside of the punch 25. The sealing head 10 and the punch 25 are at the bottom of the cup. The cup is held tightly on the outside of the punch 25.

[0031] In this embodiment, the fixed template 23 is provided with a placement groove B, the gas storage box 71 is located in the placement groove B, the punch 25 is provided with an installation groove C, the lifting cylinder 91 is located in the installation groove C, the placement groove B and the installation groove C are connected, one end of the air supply pipe 6 inserted into the positioning tube 5 passes through the support plate 8 and is connected to the lifting cylinder 91, the air supply pipe 6 is connected to an external air source, under the action of air pressure, the lifting cylinder 91 shortens, the lifting cylinder 91 drives the support plate 92, the connecting column 93 and the sealing head 10 to move, so that there is a gap between the sealing head 10 and the punch 25, which is conducive to the diffusion of the gas ejected from the air jet 74 from the gap.

[0032] Working principle and usage process of this utility model:

[0033] The fixed mold base 1 and the moving mold base are installed on the mold equipment. When the fixed mold base 1 and the moving mold base are closed, the cavity is the part in the fixed mold base 1 that directly forms the shape of the thin-walled cup plastic product. The outer surface of the thin-walled cup is formed by the fixed mold cavity, and the internal space of the cup is formed by the punch 25. After the product is formed, the fixed mold base 1 and the moving mold base open the mold. The ejection mechanism ejects the product from the punch 25 under the power of the injection molding machine. The ejected plastic cup product falls off.

[0034] The air supply pipe 6 is connected to an external air source. Under the action of air pressure, the lifting cylinder 91 shortens. The lifting cylinder 91 drives the support plate 92, the connecting column 93, and the sealing head 10 to move, so that there is a gap between the sealing head 10 and the punch 25, which facilitates the diffusion of the gas ejected from the air nozzle 74 through the gap.

[0035] The airflow channel 4 is connected to an external air source, which supplies gas, and the gas enters the interior of the gas storage box 71 from the airflow channel 4.

[0036] An external air source injects gas into the gas storage box 71 through the air flow channel 4. The gas is transported along the path of the gas storage box 71, the gas delivery pipe 72, the jet cylinder 73 and the jet nozzle 74. The gas ejected from the jet nozzle 74 fills the gap between the punch 25 and the clamped plastic cup, so that the clamped plastic cup is in a loose state, which is conducive to demolding.

[0037] In summary: The moving mold of this application has an auxiliary demolding design to loosen the molded cup that is held tightly on the moving mold core. Gas is injected into the gas storage box 71 from the air flow channel 4 and transported through the path of the gas delivery pipe 72, the air jet cylinder 73 and the air jet nozzle 74. The lifting cylinder 91 drives the support plate 92, the connecting column 93 and the sealing head 10 to move. The gas ejected from the air jet nozzle 74 diffuses from the gap and fills the gap between the punch 25 and the held plastic cup, so that the held plastic cup is in a loose state, which is conducive to demolding.

[0038] Although embodiments of the present invention have been shown and described (see the detailed description above), 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. A special mold for thin-walled injection molding, characterized in that: include Fixed mold base (1); The moving mold base includes a stabilizing plate (21), a guide post (22), a fixed template (23) and a moving template (24), and an ejection mechanism. A punch (25) that penetrates the moving template (24) is fixed on the fixed template (23). A support plate (8) is fixedly connected inside the punch (25). An airflow channel (4) is opened on the side of the fixed template (23). A positioning round tube (5) penetrates the outer surface of the fixed template (23). The gas delivery assembly includes a gas storage box (71) installed inside the fixed template (23), a gas delivery pipe (72) communicating with the inside of the gas storage box (71), and a jet cylinder (73) communicating with one end of the gas delivery pipe (72). The inner surface of the jet cylinder (73) is provided with a jet port (74). The moving component includes a lifting cylinder (91) fixed to the support plate (8) by screws, a support plate (92) welded to one end of the lifting cylinder (91), a connecting column (93) vertical to the support plate (92), a sealing head (10) fixedly connected to one end of the connecting column (93), and an air supply pipe (6) that passes through the positioning round tube (5) and is inserted into the fixed template (23).

2. The thin-walled injection mold according to claim 1, characterized in that: The ejection mechanism includes an ejection plate (31) and a top column (32). The top end of the top column (32) passes through the fixed template (23) and is embedded inside the moving template (24). A buffer spring is sleeved on the outside of the top column (32).

3. The thin-walled injection mold according to claim 1, characterized in that: The gas storage box (71) has a gas storage cavity inside, and an air inlet pipe (711) communicating with the gas storage cavity is provided on the outer surface of the gas storage box (71). The air inlet pipe (711) is embedded inside the airflow channel (4).

4. A thin-walled injection mold according to claim 1, characterized in that: The jet cylinder (73) is a hollow cone structure. The interior of the jet cylinder (73) is provided with a diversion air chamber D, and the gas delivery pipe (72) is connected to the diversion air chamber D.

5. A thin-walled injection mold according to claim 1, characterized in that: The jet nozzle (74) is inclined, the top of the punch (25) is conical, and the conical surface on the outer side of the jet cylinder (73) matches the inner surface of the conical end of the punch (25).

6. A thin-walled injection mold according to claim 1, characterized in that: The sealing head (10) penetrates the center of the top of the punch (25), and the end of the sealing head (10) near the connecting post (93) is a conical structure.

7. A thin-walled injection mold according to claim 1, characterized in that: The fixed template (23) has a placement groove B inside, the gas storage box (71) is located in the placement groove B, the punch (25) has an installation groove C inside, the lifting cylinder (91) is located in the installation groove C, the placement groove B and the installation groove C are connected, and one end of the gas supply pipe (6) inserted into the positioning tube (5) passes through the support plate (8) and is connected to the lifting cylinder (91).

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