Plastic box cover injection mold with automatic demolding function
By introducing an automatic demolding function into the injection mold of the plastic box cover, the center and edge of the plastic box cover are demolded simultaneously using cylinders and guide components. This solves the problems of poor demolding and safety hazards in the existing technology and achieves a safe and efficient automatic demolding effect.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- TAIZHOU ZHENGZHONG PLASTICS CO LTD
- Filing Date
- 2025-04-17
- Publication Date
- 2026-05-19
AI Technical Summary
Existing plastic box lid injection molds pose safety hazards and have poor demolding results, especially for thin-walled box lids which are prone to deformation and edge adhesion.
A plastic box lid injection mold with automatic demolding function was designed, including a pushing component, a guiding component, and an ejection component. By designing a plastic box lid injection mold with automatic demolding function, including a pushing component, a guiding component, and an ejection component, the center and edge of the plastic box lid are demolded simultaneously by using a cylinder and a cylinder to push the base plate, and the guide column and guide groove cooperate.
It achieves safe and efficient demolding of plastic box lids, avoiding deformation and sticking of the lids, conforming to the mold closing and unmolding process of injection molding machines, and realizing automatic demolding.
Smart Images
Figure CN224255967U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of injection mold technology, specifically to a plastic box lid injection mold with automatic demolding function. Background Technology
[0002] Plastic box lids are usually injection molded. During injection molding, an injection mold is used. After injection molding, a plastic handle is left on the plastic box lid at the injection port to make it easy for users to remove the lid. However, this method of removal requires users to put their hands into the injection molding machine. When removing the plastic box lid, it is easy for hands to come into contact with the hot mold, which poses a safety hazard. Some injection molding machines have an automatic demolding function that ejects the box lid from the center of the mold. However, the plastic box lid itself is relatively thin and has a certain degree of toughness. When ejecting from the center, the edges of the box lid are not easy to demold, resulting in the center of the box lid being demolded while the edges are stuck together. It can also cause the plastic box lid to deform, resulting in poor demolding effect. Utility Model Content
[0003] The summary section of this application is intended to provide a brief overview of the concepts, which will be described in detail in the detailed description section below. This summary section is not intended to identify key or essential features of the claimed technical solutions, nor is it intended to limit the scope of the claimed technical solutions.
[0004] To address the technical problems mentioned in the background section above, some embodiments of this application provide a plastic box lid injection mold with an automatic demolding function, including a first base, a plurality of connecting rods fixedly disposed on the first base, a second base fixedly disposed on the connecting rods, a fixed mold base fixedly disposed on the second base, an injection port fixedly disposed on the fixed mold base and the second base, and a demolding mechanism fixedly disposed on the first base; the demolding mechanism includes a pushing component, a guiding component, and an ejection component.
[0005] Specifically, the pushing assembly includes a first cylinder fixedly mounted on a first base, a second cylinder fixedly mounted on the first base, and a first base plate fixedly mounted on the first cylinder and the second cylinder.
[0006] Specifically, the guide assembly includes a second base plate fixedly mounted on a first base plate, a plurality of first guide posts fixedly mounted on the second base plate, a moving mold base fixedly mounted on the first guide posts, a plurality of second guide grooves fixedly mounted on a fixed mold base, and a plurality of second guide posts fixedly mounted on the moving mold base.
[0007] Specifically, the ejection assembly includes an ejection seat fixedly mounted on a first base, a first sliding seat slidably mounted on a first guide post, an ejection rod fixedly mounted on the first sliding seat and passing through the first base plate and the second base plate, a first demolding reset device fixedly mounted on the first sliding seat, and a plurality of second demolding reset devices fixedly mounted on the first sliding seat.
[0008] Specifically, the demolding and resetting device includes a first demolding rod fixedly mounted on the first sliding seat and passing through the moving mold seat, a first collar fixedly mounted on the moving mold seat and sleeved on the first demolding rod, a second collar fixedly mounted on the fixed mold seat and sleeved on the first demolding rod, and a first spring fixed at one end on the first collar and at the other end on the second collar.
[0009] Specifically, the second demolding reset device includes a second demolding rod fixedly mounted on the first sliding seat and passing through the moving mold seat, a third collar fixedly mounted on the moving mold seat and sleeved on the second demolding rod, a fourth collar fixedly mounted on the fixed mold seat and sleeved on the second demolding rod, and a second spring fixed at one end on the third collar and at the other end on the fourth collar.
[0010] Specifically, the second base plate is connected to the first base plate by multiple bolts.
[0011] Specifically, the first base and the second base are fixedly mounted on the injection molding machine.
[0012] The beneficial effects of this utility model are:
[0013] (1) A first demolding device and a second demolding device are provided. The first demolding rod and the second demolding rod simultaneously eject the center and edge of the plastic box cover, which improves the demolding efficiency, prevents the plastic box cover from sticking to the moving mold base, and also prevents the plastic box cover from deforming during demolding. At the same time, during the process of closing the moving mold base, the first spring and the second spring can automatically reset, realizing automatic demolding.
[0014] (2) No additional drive equipment is used. The demolding function fully complies with the existing mold closing and demolding process of the injection molding machine, and automatic demolding is achieved during the demolding process. Attached Figure Description
[0015] The accompanying drawings, which form part of this application, are used to provide a further understanding of the application and to make other features, objects, and advantages of the application more apparent. The illustrative embodiments and descriptions of this application are used to explain the application and do not constitute an undue limitation of the application.
[0016] Furthermore, throughout the accompanying drawings, the same or similar reference numerals denote the same or similar elements. It should be understood that the drawings are schematic, and the elements are not necessarily drawn to scale.
[0017] In the attached diagram:
[0018] Figure 1 This is a schematic diagram of the structure of this utility model;
[0019] Figure 2 This is a top view of the present invention;
[0020] Figure 3 for Figure 2 A line section of AA;
[0021] Figure 4 for Figure 3 A line section view of BB;
[0022] Figure 5 for Figure 3 A magnified view of a section at point C;
[0023] Figure 6 for Figure 3 A magnified view of a section at point D. Detailed Implementation
[0024] Embodiments of this disclosure will now be described in more detail with reference to the accompanying drawings. While some embodiments of this disclosure are shown in the drawings, it should be understood that this disclosure can be implemented in various forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided to provide a more thorough and complete understanding of this disclosure. It should be understood that the accompanying drawings and embodiments of this disclosure are for illustrative purposes only and are not intended to limit the scope of protection of this disclosure.
[0025] It should also be noted that, for ease of description, only the parts relevant to the utility model are shown in the accompanying drawings. Unless otherwise specified, the embodiments and features described in this disclosure can be combined with each other.
[0026] It should be noted that the concepts of "first" and "second" mentioned in this disclosure are used only to distinguish different devices, modules or units, and are not used to limit the order of functions performed by these devices, modules or units or their interdependencies.
[0027] It should be noted that the terms "a" and "a plurality of" used in this disclosure are illustrative rather than restrictive, and those skilled in the art should understand that, unless otherwise expressly indicated in the context, they should be understood as "one or more".
[0028] This disclosure will now be described in detail with reference to the accompanying drawings and embodiments.
[0029] Reference Figures 1-6As shown, the present invention discloses a plastic box lid injection mold with automatic demolding function, comprising a first base 1, multiple connecting rods 2 fixedly mounted on the first base, a second base 3 fixedly mounted on the connecting rods, a fixed mold base 4 fixedly mounted on the second base, an injection port 5 fixedly mounted on the fixed mold base and the second base, and a demolding mechanism 6 fixedly mounted on the first base; the demolding mechanism includes a pushing component 61, a guiding component 62, and an ejection component 63; the first base and the second base are fixedly mounted on an injection molding machine; the fixed mold base is fixedly mounted on the second base, and the fixed mold base has a groove, which together with the groove on the moving mold base forms an injection cavity; the injection port is connected to the injection molding machine, and the molten plastic is injected into the injection cavity from the injection port; the pushing component is used to push the moving mold base and cooperates with the ejection component to demold the plastic box lid during demolding; the guiding component cooperates with the pushing component to allow the moving mold base to fit against the fixed mold base.
[0030] Specifically, the pushing assembly includes a first cylinder 611 fixedly mounted on a first base, a second cylinder 612 fixedly mounted on a first base, and a first base plate 613 fixedly mounted on the first cylinder and the second cylinder; the first cylinder and the second cylinder move synchronously to push the first base plate to move; the first base plate is provided with a through hole through which the ejector assembly can pass.
[0031] Specifically, the guiding assembly includes a second base plate 621 fixedly mounted on a first base plate, a plurality of first guide posts 622 fixedly mounted on the second base plate, a moving mold base 623 fixedly mounted on the first guide posts, a plurality of second guide grooves 624 fixedly mounted on a fixed mold base, and a plurality of second guide posts 625 fixedly mounted on the moving mold base; the second base plate has a through hole communicating with a through hole on the first base plate, through which the ejector assembly can pass; the first guide posts are used to connect the moving mold base and the second base plate; the second guide posts and the second guide grooves are used to align the positions of the moving mold base and the fixed mold base.
[0032] Specifically, the ejection assembly includes an ejector seat 631 fixedly mounted on the first base, a first sliding seat 632 slidably mounted on the first guide post, an ejector rod 633 fixedly mounted on the first sliding seat and passing through the first base plate and the second base plate, a first demolding reset device 634 fixedly mounted on the first sliding seat, and multiple second demolding reset devices 635 fixedly mounted on the first sliding seat. The first sliding seat is very lightweight. During the demolding process, the first cylinder and the second cylinder drive the first base plate and the second base plate to move. The second base plate and the moving mold seat are fixedly connected through the first guide post, which will drive the first moving mold seat to move and then separate from the fixed mold seat. During the movement of the moving mold seat, the first demolding reset device and the second demolding reset device drive the first sliding seat and the ejector rod to move. When the ejector rod contacts the ejector seat, the ejector seat pushes the first demolding reset device and the second demolding reset device to move, so that the plastic box cover is demolded.
[0033] Specifically, the demolding and resetting device includes a first demolding rod 6341 fixedly mounted on the first sliding seat and passing through the moving mold seat; a first collar 6342 fixedly mounted on the moving mold seat and sleeved on the first demolding rod; a second collar 6343 fixedly mounted on the fixed mold seat and sleeved on the first demolding rod; and a first spring 6344 with one end fixed to the first collar and the other end fixed to the second collar. The first spring is a compression spring. During the movement and engagement of the moving mold seat, the first cylinder and the second cylinder push the first base plate and the second base plate to move, and the second base plate engages with the first sliding seat. The moving mold seat and the second base plate are fixedly connected by the first guide rod. The first spring will not be compressed. When demolding, the first cylinder and the second cylinder drive the first base plate and the second base plate to move. The second base plate drives the moving mold seat to move through the first guide rod. Since the first sliding seat is very light, the moving mold seat pushes the first sliding seat to move on the first guide rod through the first spring. When the ejector rod on the first sliding seat contacts the ejector seat, the ejector seat pushes the ejector rod and the first sliding seat to move in opposite directions on the first sliding rod. The first spring is compressed. After the first sliding seat moves in the opposite direction, the end of the first demolding rod that passes through the moving mold seat will push outward, protruding from the moving mold seat, and ejecting the plastic box cover from the mold. The center of the first demolding rod is coaxial with the center of the plastic box cover.
[0034] Specifically, the second demolding reset device includes a second demolding rod 6351 fixedly mounted on the first sliding seat and passing through the moving mold seat, a third collar 6352 fixedly mounted on the moving mold seat and sleeved on the second demolding rod, a fourth collar 6353 fixedly mounted on the fixed mold seat and sleeved on the second demolding rod, and a second spring 6354 fixed at one end on the third collar and at the other end on the fourth collar. The working principle of the second demolding reset device is the same as that of the first demolding reset device. The second demolding rod is positioned around the first demolding rod, which can eject the edge of the plastic box cover for demolding. The diameter of the second demolding rod is smaller than that of the first demolding rod. The first demolding rod and the second demolding rod eject the center and edge of the plastic box cover simultaneously, which improves the demolding efficiency, prevents the plastic box cover from sticking to the moving mold seat, and also prevents the plastic box cover from deforming during demolding. At the same time, during the process of the moving mold seat closing, the first spring and the second spring can automatically reset, realizing automatic demolding.
[0035] Specifically, the second base plate is connected to the first base plate by multiple bolts 7.
[0036] Specifically, the first base and the second base are fixedly mounted on the injection molding machine.
[0037] The above description is merely a selection of preferred embodiments of this disclosure and an explanation of the technical principles employed. Those skilled in the art should understand that the scope of the utility model involved in the embodiments of this disclosure is not limited to the technical solutions formed by specific combinations of the above-described technical features, but should also cover other technical solutions formed by arbitrary combinations of the above-described technical features or their equivalents without departing from the above-described inventive concept. For example, technical solutions formed by substituting the above features with (but not limited to) technical features with similar functions disclosed in the embodiments of this disclosure.
Claims
1. A plastic box lid injection mold with automatic demolding function, characterized in that: It includes a first base (1), multiple connecting rods (2) fixedly mounted on the first base, a second base (3) fixedly mounted on the connecting rods, a fixed mold base (4) fixedly mounted on the second base, an injection port (5) fixedly mounted on the fixed mold base and the second base, and a demolding mechanism (6) fixedly mounted on the first base; the demolding mechanism includes a pushing component (61), a guiding component (62), and an ejection component (63); The pushing assembly includes a first cylinder (611) fixedly mounted on a first base, a second cylinder (612) fixedly mounted on a first base, and a first base plate (613) fixedly mounted on the first cylinder and the second cylinder. The guide assembly includes a second base plate (621) fixedly mounted on a first base plate, a plurality of first guide posts (622) fixedly mounted on the second base plate, a moving mold base (623) fixedly mounted on the first guide posts, a plurality of second guide grooves (624) fixedly mounted on a fixed mold base, and a plurality of second guide posts (625) fixedly mounted on the moving mold base. The ejection assembly includes an ejection seat (631) fixedly mounted on a first base, a first sliding seat (632) slidably mounted on a first guide post, an ejection rod (633) fixedly mounted on the first sliding seat and passing through the first base plate and the second base plate, a first demolding reset device (634) fixedly mounted on the first sliding seat, and a plurality of second demolding reset devices (635) fixedly mounted on the first sliding seat. The demolding and resetting device includes a first demolding rod (6341) fixedly mounted on the first sliding seat and passing through the moving mold seat, a first collar (6342) fixedly mounted on the moving mold seat and sleeved on the first demolding rod, a second collar (6343) fixedly mounted on the fixed mold seat and sleeved on the first demolding rod, and a first spring (6344) with one end fixed on the first collar and the other end fixed on the second collar; the center of the first demolding rod is coaxial with the center of the plastic box cover; The second demolding reset device includes a second demolding rod (6351) fixedly mounted on the first sliding seat and passing through the moving mold seat, a third collar (6352) fixedly mounted on the moving mold seat and sleeved on the second demolding rod, a fourth collar (6353) fixedly mounted on the fixed mold seat and sleeved on the second demolding rod, and a second spring (6354) with one end fixed on the third collar and the other end fixed on the fourth collar; the second demolding rod is positioned around the first demolding rod and can eject the edge of the plastic box cover for demolding.
2. The plastic box lid injection mold with automatic demolding function according to claim 1, characterized in that: The second base plate is connected to the first base plate by multiple bolts (7).
3. The plastic box lid injection mold with automatic demolding function according to claim 1, characterized in that: The first base and the second base are fixedly mounted on the injection molding machine.