Blowing demolding structure of injection mold

Abstract

A blowing demolding structure of an injection mold comprises an upper compound plate and a lower compound plate, a fixed mold plate is arranged below the upper compound plate, a through hole is formed in the lower compound plate, a mold foot and an ejection assembly are arranged on the lower compound plate, an ejection rod of an injection molding machine penetrates through the through hole to be matched with the ejection assembly, a movable mold plate is arranged on the mold foot, a protruding mold core block is arranged on the movable mold plate, and a stripper plate is arranged on the movable mold plate. A through hole is formed in the stripper plate, a clamping groove is formed in the stripper plate and located on the upper portion of the through hole, a mold cavity is formed among the stripper plate, the core block and the fixed mold plate, a plastic part is arranged in the mold cavity, a downward turnup is arranged on the periphery of the plastic part, a baffle is arranged on the outer wall of the turnup, bottom feet are arranged on the lower portion of the baffle and clamped into the clamping groove of the stripper plate, and an air inlet hole is formed in the movable mold plate. An air blowing seat is arranged in the movable mold plate, a vent hole and an air blowing hole are formed in the air blowing seat, the air inlet hole is communicated with the vent hole, the vent hole is communicated with the air blowing hole, and the air blowing hole corresponds to the through hole and the inner wall of the lower part of the plastic part.

Description

Technical Field

[0001] This invention relates to injection molds, and more particularly to air-blowing demolding structures for injection molds. Background Technology

[0002] After injection molding of a plastic part, an ejection mechanism is typically used to eject the part from the moving mold plate. This ejection mechanism usually employs an ejector plate with ejector pins that directly eject the part, or the ejector pins drive a stripper plate to eject the part. If the injection-molded plastic part has downward-facing flanges around its edges, with baffles on the outer walls of these flanges and protruding feet at the bottom, the cavities between the flanges create a strong clamping force on the core block of the moving mold plate. Direct ejection with ejector pins can easily cause deformation of the plastic part during ejection, preventing it from being ejected. Therefore, a stripper plate is needed to first push the baffles around the edges to eject the part from the core block of the moving mold plate. Since the bottom feet of the part are stuck on the stripper plate, a secondary ejection mechanism is required to eject the part from the stripper plate. Some secondary ejector structures typically consist of a secondary ejector plate and secondary ejector pins on the ejector plate, with a secondary ejection control structure on the outer wall of the moving mold plate. After the stripper plate ejects the plastic part and demolds it, the ejector plate and stripper plate stop moving. At this point, the secondary ejector plate is controlled by the secondary ejector control structure to drive the secondary ejector pins to push the plastic part upward out of the stripper plate. This structure is very complex, which increases the mold development cost. Furthermore, the installation and debugging process of the secondary ejection control structure is cumbersome, occupies a large amount of external space in the mold, and is not conducive to the overall compact design of the mold. Summary of the Invention

[0003] The purpose of this invention is to overcome the shortcomings of existing technologies and provide an injection mold blowing demolding structure that achieves secondary demolding of plastic parts through pneumatic means, effectively simplifies the mold structure and reduces the mold development cost.

[0004] The technical solution of the injection mold blowing demolding structure of the present invention is as follows: It includes an upper cover plate and a lower cover plate. A fixed template is provided under the upper cover plate. A through hole is formed in the lower cover plate. Mold feet are provided on the lower cover plate. An ejector assembly is provided on the lower cover plate between the mold feet. The ejector rod of the injection molding machine passes through the through hole and cooperates with the ejector assembly. A movable template is provided on the mold feet. A protruding core block is provided on the movable template. A stripper plate is provided on the movable template. A through hole is formed in the stripper plate. The inner wall of the through hole cooperates with the outer wall of the core block. A slot is provided on the stripper plate above the through hole. A mold cavity is formed between the material plate, the core block, and the fixed mold plate. A plastic part is injection molded in the mold cavity. The plastic part has downward flanges around its perimeter. A baffle is provided on the outer wall of the flange. The bottom of the baffle contacts the stripper plate. A protruding foot is provided at the bottom of the baffle. The foot is engaged in the slot of the stripper plate. An air inlet is provided in the moving mold plate. An air blowing seat is provided in the moving mold plate. The air blowing seat has a vent hole and an air blowing hole. The air inlet and the vent hole are connected. The vent hole and the air blowing hole are connected. The air blowing hole corresponds to the vent hole and the lower inner wall of the plastic part.

[0005] Furthermore, the ejection assembly includes an upper ejector plate and a lower ejector plate. The ejector rod of the injection molding machine passes through the perforation and contacts the lower ejector plate. Ejector pins are provided on the upper and lower ejector plates, and the ejector pins pass through the moving template and connect to the stripper plate.

[0006] Furthermore, the air inlet is a cone-shaped structure tilted upwards, with its inlet diameter being larger than its outlet diameter.

[0007] Furthermore, the number of air holes is two or more.

[0008] The beneficial effects of the air-blowing demolding structure for injection molds of the present invention are: by replacing the traditional secondary ejector pin structure with a pneumatic method, the plastic part can be easily ejected from the stripper plate, eliminating the need for a complex secondary ejection control mechanism outside the mold, effectively simplifying the mold structure and reducing the mold development cost. Attached Figure Description

[0009] Figure 1 This is a schematic diagram of the mold closing state structure of the air blowing demolding structure of the injection mold of the present invention; Figure 2 This is a schematic diagram of the mold opening state structure of the air blowing demolding structure of the injection mold of the present invention; Figure 3 This is a schematic diagram of the ejector plate of the air-blowing ejection structure of the injection mold of the present invention, which drives the plastic part to be ejected from the core block; Figure 4 This is a schematic diagram of the high-pressure gas blowing out of the plastic part from the stripper plate in the injection mold blowing demolding structure of the present invention.

[0010] In the diagram, 1. Upper cover plate; 2. Lower cover plate; 3. Fixed template; 4. Mold foot; 5. Ejector pin; 6. Moving template; 7. Core block; 8. Stripper plate; 9. Through hole; 10. Slot; 11. Plastic part; 12. Flanged edge; 13. Baffle; 14. Base foot; 15. Air inlet; 16. Air blower seat; 17. Vent hole; 18. Air blower hole; 19. Upper ejector plate; 20. Lower ejector plate; 21. Ejector pin; 22. Through hole. Detailed Implementation

[0011] To enable those skilled in the art to better understand the technical solutions of the present invention, preferred embodiments of the present invention are described below in conjunction with specific examples. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote elements with the same or similar functions throughout. However, it should be understood that the drawings are for illustrative purposes only and should not be construed as limiting the present invention. To better illustrate this embodiment, some parts in the drawings may be omitted, enlarged, or reduced, and do not represent the actual product dimensions. It is understandable for those skilled in the art that some well-known structures and their descriptions may be omitted in the drawings. The positional relationships described in the drawings are for illustrative purposes only and should not be construed as limiting the present invention.

[0012] It should be noted that the terms "comprising" and "having," and any variations thereof, in the specification, claims, and accompanying drawings of this invention are intended to cover non-exclusive inclusion. The terms "set," "equipped with," "installed," "connected," and "connected" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral construction; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium, or an internal connection between two mechanisms, elements, or components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0013] In the description of this invention, it should be understood that the terms "upper," "lower," "left," "right," 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 the invention and for simplifying the description, and do not indicate or imply that the mechanism 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 the invention. The terms "first" and "second" are also used only for the sake of brevity in description and do not indicate or imply relative importance.

[0014] To further illustrate the content, features, and effects of this invention, the invention will be described in detail below with reference to the accompanying drawings and examples, but this should not be construed as limiting the invention.

[0015] This invention relates to an air-blowing demolding structure for injection molds, such as... Figure 1 — Figure 4 As shown, the system includes an upper platen 1 and a lower platen 2. A fixed template 3 is provided under the upper platen 1. A through hole 22 is provided in the lower platen 2. Mold feet 4 are provided on the lower platen 2. An ejector assembly is provided on the lower platen 2 between the mold feet 4. The ejector rod 5 of the injection molding machine passes through the through hole 22 and cooperates with the ejector assembly. A movable template 6 is provided on the mold feet 4. A protruding core block 7 is provided on the movable template 6. A stripper plate 8 is provided on the movable template 6. A through hole 9 is provided in the stripper plate 8. The inner wall of the through hole 9 cooperates with the outer wall of the core block 7. A slot 10 is provided on the stripper plate 8 above the through hole 9. A mold cavity is formed between the stripper plate 8, the core block 7 and the fixed template 3. The mold cavity contains an injection-molded plastic part 11. The plastic part 11 has downward-facing flanges 12 around its perimeter. A baffle 13 is provided on the outer wall of the flange 12. The bottom of the baffle 13 contacts the stripper plate 8. A protruding foot 14 is provided at the bottom of the baffle 13. The foot 14 is inserted into the slot 10 of the stripper plate 8. An air inlet 15 is provided in the moving mold plate 6. An air blowing seat 16 is provided in the moving mold plate 6. An air vent 17 and an air blowing hole 18 are provided in the air blowing seat 16. The air inlet 15 communicates with the air vent 17. The air vent 17 communicates with the air blowing hole 18. The air blowing hole 18 corresponds to the through hole 9 and the lower inner wall of the plastic part 11.

[0016] Furthermore, the ejection assembly includes an upper ejector plate 19 and a lower ejector plate 20. The ejector rod 5 of the injection molding machine passes through the through hole 22 and contacts the lower ejector plate 20. Ejector pins 21 are provided on the upper ejector plate 19 and the lower ejector plate 20. The ejector pins 21 pass through the moving template 6 and connect to the stripper plate 8.

[0017] Furthermore, the air blowing hole 18 is an upwardly inclined cone shape, with its inlet diameter larger than its outlet diameter. The upwardly inclined cone design of the air blowing hole 18, with its inlet diameter larger than its outlet diameter, can accelerate and guide the high-pressure gas, allowing the airflow to be concentrated and sprayed onto the bottom of the plastic part 11 at a higher speed, thereby improving demolding efficiency.

[0018] Furthermore, there are two or more air blowing holes 18. The number of air blowing holes 18 corresponds to the number of plastic parts 11. By providing two or more air blowing holes 18, air blowing can be performed on two or more plastic parts 11 simultaneously for demolding, ensuring demolding efficiency.

[0019] This invention discloses an air-blowing demolding structure for injection molds. After the plastic part 11 is injection molded, the injection molding machine drives the lower cover plate 2 to move downwards. The lower cover plate 2 drives the ejector assembly, mold feet 4, moving mold plate 6, core block 7, stripper plate 8, plastic part 11, and air-blowing seat 16 to move downwards together, while the upper cover plate 1 and the fixed mold plate 3 remain stationary, causing the mold to open from the fixed mold plate 3 and the moving mold plate 6. Then, the ejector rod 5 of the injection molding machine pushes the lower ejector plate 20 of the ejector assembly to move upwards. The lower ejector plate 20 drives the upper ejector plate 19 and ejector pins 21 to move upwards. The ejector pins 21 pass through the moving mold plate 6 and drive the stripper plate 8 to move upwards, thus stripping the plastic part. Plate 8 drives and pushes the plastic part 11 upward to eject it from the core block 7. The bottom foot 14 of the plastic part 11 is still stuck in the slot 10 of the stripper plate 8, but the clamping force between the bottom foot 14 and the slot 10 is small. At this time, high-pressure air is input into the air inlet 15 through the high-pressure air pump, and then transported to the vent 17 through the air inlet 15 and blown out from the air blowing hole 18. The air blowing hole 18 is aligned with the through hole 9 and the lower part of the plastic part 11. Under the action of the air pressure thrust of the high-pressure gas, the bottom foot 14 of the plastic part 11 can be easily ejected upward from the slot 10, thereby blowing the plastic part 11 upward from the stripper plate 8 and realizing the complete demolding of the plastic part 11.

[0020] Although the embodiments of this application disclose the above-described methods, the content is merely an implementation method adopted for ease of understanding. Any person skilled in the art should understand that any modifications and changes in the form and details of the implementation can be made without departing from the spirit and scope of the present invention. However, the scope of patent protection of the present invention shall still be determined by the scope defined in the appended claims.

Claims

1. An air-blowing demolding structure for injection molds, characterized in that: The system includes an upper platen (1) and a lower platen (2). A fixed template (3) is provided under the upper platen (1). A through hole (22) is provided in the lower platen (2). A mold foot (4) is provided on the lower platen (2). An ejector assembly is provided on the lower platen (2) between the mold feet (4). The ejector rod (5) of the injection molding machine passes through the through hole (22) and cooperates with the ejector assembly. A movable template (6) is provided on the mold foot (4). A protruding core block (7) is provided on the movable template (6). A stripper plate (8) is provided on the movable template (6). A through hole (9) is provided in the stripper plate (8). The inner wall of the through hole (9) cooperates with the outer wall of the core block (7). A slot (10) is provided on the stripper plate (8) above the through hole (9). A mold cavity is formed between the stripper plate (8), the core block (7) and the fixed template (3). The mold cavity contains a plastic part (11) that has been injection molded. The plastic part (11) has downward flanges (12) around its perimeter. A baffle (13) is provided on the outer wall of the flange (12). The baffle (13) is in contact with the stripper plate (8) below. A protruding foot (14) is provided at the bottom of the baffle (13). The foot (14) is inserted into the slot (10) of the stripper plate (8). An air inlet (15) is provided in the moving template (6). An air blowing seat (16) is provided in the moving template (6). A ventilation hole (17) and an air blowing hole (18) are provided in the air blowing seat (16). The air inlet (15) is connected to the ventilation hole (17). The ventilation hole (17) is connected to the air blowing hole (18). The air blowing hole (18) corresponds to the through hole (9) and the lower inner wall of the plastic part (11).

2. The air-blowing demolding structure for injection molds as described in claim 1, characterized in that: The ejector assembly includes an upper ejector plate (19) and a lower ejector plate (20). The ejector rod (5) of the injection molding machine passes through the through hole (22) and contacts the lower ejector plate (20). Ejector pins (21) are provided on the upper ejector plate (19) and the lower ejector plate (20). The ejector pins (21) pass through the moving template (6) and connect to the stripper plate (8).

3. The air-blowing demolding structure for injection molds as described in claim 1, characterized in that: The air inlet (18) is a cone-shaped structure that is tilted upwards, and its inlet diameter is larger than its outlet diameter.

4. The air-blowing demolding structure for injection molds as described in claim 1, characterized in that: The air inlet (18) is two or more.

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