Automatic injection molding production equipment for food packaging boxes
By combining a fixed mold, a moving mold, and an ejector section, a two-stage ejection process is used to solve the problem of damage and deformation of the skirt of plastic packaging boxes caused by traditional ejector pin demolding methods, thus achieving smooth demolding and reducing damage.
Patent Information
- Application Number
- CN202520417534.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-03-11
- Publication Date
- 2026-02-03
- Estimated Expiration
- 2035-03-11
AI Technical Summary
Traditional ejector pin demolding methods can easily damage or deform the skirt of plastic packaging boxes, especially when the skirt is thin or the material is soft, and demolding is difficult.
It adopts a combination structure of fixed mold, moving mold, moving mold auxiliary part and ejection part, and achieves complete separation of plastic packaging box through two ejection processes. The cooperation of push rod, push block and spring reduces skirt deformation and damage.
It improves the smoothness of the demolding process for plastic packaging boxes and reduces the risk of deformation and damage to the skirt.
Smart Images
Figure CN223864238U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of food packaging box injection molding technology, specifically to an automatic injection molding production equipment for food packaging boxes. Background Technology
[0002] When manufacturing plastic food packaging boxes, plastic raw material granules need to be heated and melted before being added to a mold. After cooling and solidification, the boxes are then demolded.
[0003] In the injection molding industry, especially in the production of plastic packaging boxes with a skirt around the outer edge of the opening, the traditional demolding method mainly involves ejecting the molded product from the mold using ejector pins. However, this method has the following problems in practical applications: due to the skirt structure, traditional ejector pin demolding often easily causes damage or deformation to the skirt area of the packaging box during the ejection process, especially when the skirt is thin or the material is soft, the risk of damage increases significantly. In addition, the tight fit between the skirt and the mold cavity also increases the difficulty of demolding. Utility Model Content
[0004] (a) Technical problems to be solved
[0005] This invention provides an automatic injection molding production equipment for food packaging boxes, which solves the problems mentioned in the background art.
[0006] (II) Technical Solution
[0007] To achieve the above objectives, this utility model provides the following technical solution: an automatic injection molding production equipment for food packaging boxes, comprising a fixed mold, a moving mold, a mold auxiliary part, and an ejector part. The fixed mold has a first cavity with a gate connected to it on the side facing the moving mold. The moving mold auxiliary part includes a template, and a second cavity is formed at the center of the template. The first cavity and the second cavity together form an injection molding cavity. The moving mold includes a base, an inner core, and an inner groove. The inner core is formed at the center of the base facing the fixed mold and passes through the second cavity to form an injection molding core. The inner groove is formed in the middle of the base and the inner core. The ejector part is movably installed in the inner groove and is used for ejecting the injection-molded product.
[0008] Preferably, the ejector portion includes a push rod, a connecting plate, a push block, and a spring. The push rod is movably disposed in the inner groove and extends out of the inner groove as it moves away from the fixed mold. A connecting plate is fitted onto the outer wall of the push rod and is fixedly connected thereto. The spring is disposed in the inner groove and its two ends are fixedly connected to the inner wall of the inner groove and the connecting plate, respectively. The push block is formed on the end of the push rod facing the fixed mold and can move with the push rod to pass through the inner core.
[0009] In a further preferred embodiment, the moving mold auxiliary part further includes a connecting column, a connecting seat, an inclined column, and a push plate. The side of the template facing away from the fixed mold is fixedly connected to the connecting seat via the connecting column. The connecting column passes through the base and allows the connecting seat to be movably disposed inside the base. The inclined column is formed on the inner end face of the base and passes through the push plate and is slidably connected to it. The connecting seat has a groove that mates with the push plate. The length of the groove is greater than the length of the push plate, and the width of the connecting seat is adapted to the width of the push plate. A notch is also formed at the end of the connecting seat near the inclined column. The inclined column passes through the notch on the connecting seat. The push plate is disposed on the side of the push rod and close to the push rod, and the end of the push plate near the push rod is set as an inclined surface.
[0010] In a further preferred embodiment, the back of the base is formed with an opening facing the connector.
[0011] (III) Beneficial Effects
[0012] Compared with the prior art, this utility model provides an automatic injection molding production equipment for food packaging boxes, which has the following beneficial effects:
[0013] In this invention, the coordinated arrangement of the fixed mold, the moving mold, the moving mold auxiliary part, and the ejection part enables the injection-molded plastic packaging box with a skirt around the outer edge of the injection opening to be completely separated from the moving mold through two ejection processes. This improves the smoothness of the demolding process of the plastic packaging box and reduces deformation and damage during the demolding process. Attached Figure Description
[0014] Figure 1 This is a cross-sectional structural diagram of an automated injection molding production equipment for food packaging boxes according to the implementation plan.
[0015] Figure 2 for Figure 1 A schematic diagram of an automated injection molding production line for food packaging boxes.
[0016] Figure 3 for Figure 1 A schematic diagram of the automatic injection molding production equipment for food packaging boxes, omitting the fixed mold and showing the cut-out structure of the moving mold and its auxiliary parts.
[0017] Figure 4 for Figure 1 A schematic diagram of the auxiliary part of the moving mold after omitting the fixed mold.
[0018] In the diagram: 10. Fixed mold; 20. Moving mold; 21. Base; 22. Inner core; 23. Inner groove; 24. Opening; 30. Moving mold auxiliary part; 31. Template; 311. Second cavity; 32. Connecting pillar; 33. Connecting seat; 331. Slide groove; 34. Inclined pillar; 35. Push plate; 40. Ejector part; 41. Push rod; 42. Connecting plate; 43. Push block; 44. Spring. Detailed Implementation
[0019] 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.
[0020] Please see Figures 1 to 4 An automatic injection molding production device for food packaging boxes includes a fixed mold 10, a moving mold 20, a moving mold auxiliary part 30, and an ejector part 40. The fixed mold 10 has a first cavity with a gate on the side facing the moving mold 20. The moving mold auxiliary part 30 includes a template 31, and a second cavity 311 is formed at the center of the template 31. The first cavity and the second cavity 311 together form a complete injection molding cavity. The moving mold 20 includes a base 21 and an inner core 22. The inner core 22 is formed at the center of the base 21 facing the fixed mold 10, and passes through the second cavity 311, forming an injection molding core. Molten plastic can be injected between the inner core 22 and the injection molding cavity formed by the first cavity and the second cavity 311 for injection molding. An inner groove 23 is formed in the middle of the base 21 and the inner core 22, and the ejector part 40 is movably installed in the inner groove 23, allowing it to be used for ejecting the injection-molded product after injection molding is completed and cooled.
[0021] In this embodiment, the moving mold auxiliary part 30 further includes a connecting column 32, a connecting seat 33, an inclined column 34, and a push plate 35. The side of the template 31 facing away from the fixed mold 10 is fixedly connected to the connecting seat 33 via the connecting column 32. The connecting column 32 passes through the base 21, allowing the connecting seat 33 to be movably disposed inside the base 21. When the connecting seat 33 moves, it can drive the connecting column 32 and the template 31 to move accordingly. The inclined column 34 is formed on the inner end face of the base 21, and the inclined column 34 passes through the push plate 35 and is slidably connected to it. A groove 331 that cooperates with the push plate 35 is formed on the connecting seat 33. The length of the groove 331 is greater than the length of the push plate 35, and the width of the connecting seat 33 is adapted to the width of the push plate 35, so that when the connecting seat 33 moves, it can drive the push plate 35 to slide in the groove 331 under the guidance of the inclined column 34, and perform the first ejection of the food packaging box. The push plate 35 is located on the side of the push rod 41 and close to the push rod 41 in the ejector part 40. The end of the push plate 35 close to the push rod 41 is set as an inclined surface, so that after the push plate 35 slides close to the push rod 41 in the ejector part 40, the push rod 41 can be pushed by the inclined surface at the end of the push plate 35, so that the ejector part 40 can eject for a second time.
[0022] In this embodiment, an opening 24 is formed on the back side of the base 21, and the opening 24 faces the connector 33, so that the output end of the drive source can pass through the opening 24 and connect with the connector 33, thereby driving the connector 33 to move.
[0023] In this embodiment, the ejector part 40 includes a push rod 41, a connecting plate 42, a push block 43, and a spring 44. The push rod 41 is movably disposed in the inner groove 23, and extends out of the inner groove 23 when moving away from the fixed mold 10, so that it can be pushed by the push plate 35. The connecting plate 42 is sleeved on the outer wall of the push rod 41 and fixedly connected to it. The spring 44 is disposed in the inner groove 23 and its two ends are fixedly connected to the inner wall of the inner groove 23 and the connecting plate 42, respectively. When the push rod 41 is pushed by the push plate 35, the spring 44 can be squeezed. When the push plate 35 separates from the push rod 41, the spring 44 can be used to reset the push rod 41. The push block 43 is formed on the end of the push rod 41 facing the fixed mold 10 and embedded in the inner core 22. The push block 43 can move with the push rod 41 and pass through the inner core 22 to eject the formed food packaging box.
[0024] In this embodiment, a notch is formed at one end of the connecting seat 33 near the inclined post 34, through which the inclined post 34 can pass to avoid interference between the two.
[0025] After injection molding and cooling, the output of the drive device moves the connecting seat 33 away from the fixed mold 10, causing the moving mold auxiliary part 30 and the ejector part 40 to move away from the fixed mold 10. Then, the output of the drive device moves the connecting seat 33 toward the fixed mold 10. During this process, the movement of the template 31 allows the injection-molded food packaging box to separate from the inner core 22. At this time, the ejector part 40 moves simultaneously with the moving mold auxiliary part 30. As the connecting seat 33 is pushed, the push plate 35 gradually moves to push the push rod 41, causing the push rod 41 to drive the push block 43 to push the injection-molded food packaging box outward a certain distance again, so that the skirt part at the opening of the injection-molded food packaging box can separate from the template 31. By coordinating the fixed mold 10, the moving mold 20, the moving mold auxiliary part 30, and the ejection part 40, when a plastic packaging box with a skirt around the outer edge of the injection molding opening is produced, the injection-molded plastic packaging box can be completely separated from the moving mold 20 through two ejection processes. This improves the smoothness of the demolding process of the plastic packaging box and reduces deformation and damage during the demolding process.
[0026] Of all the solutions mentioned above, those involving the connection between two components can be selected according to the actual situation, such as welding, bolt and nut connection, bolt or screw connection, or other known connection methods, which will not be elaborated here. For all the fixed connections mentioned above, welding is preferred. Although embodiments of this utility model have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of this utility model. The scope of this utility model is defined by the appended claims and their equivalents.
Claims
1. An automatic injection molding production equipment for food packaging boxes, comprising a fixed mold (10) and a moving mold (20), characterized in that, It also includes a moving mold auxiliary part (30) and an ejector part (40). The fixed mold (10) has a first cavity with a gate on the side facing the moving mold (20). The moving mold auxiliary part (30) includes a template (31). A second cavity (311) is formed at the center of the template (31). The first cavity and the second cavity (311) together form an injection molding cavity. The moving mold (20) includes a base (21), an inner core (22) and an inner groove (23). The inner core (22) is formed at the center of the base (21) on the side facing the fixed mold (10), and the inner core (22) passes through the second cavity (311) and constitutes an injection molding core. The inner groove (23) is formed in the middle of the base (21) and the inner core (22), and the ejector (40) is movably installed in the inner groove (23) for ejecting the injection-molded product.
2. The automatic injection molding production equipment for food packaging boxes according to claim 1, characterized in that: The ejector part (40) includes a push rod (41), a connecting plate (42), a push block (43), and a spring (44). The push rod (41) is movably disposed in the inner groove (23), and the push rod (41) extends out of the inner groove (23) when it moves away from the fixed mold (10). The connecting plate (42) is sleeved on the outer wall of the push rod (41) and fixedly connected to it. The spring (44) is disposed in the inner groove (23) and its two ends are fixedly connected to the inner wall of the inner groove (23) and the connecting plate (42) respectively. The push block (43) is formed on the end of the push rod (41) facing the fixed mold (10), and the push block (43) can follow the push rod (41) to move out of the inner core (22).
3. The automatic injection molding production equipment for food packaging boxes according to claim 2, characterized in that: The moving mold auxiliary part (30) also includes a connecting column (32), a connecting seat (33), an inclined column (34), and a push plate (35). The side of the template (31) facing away from the fixed mold (10) is fixedly connected to the connecting seat (33) by the connecting column (32). The connecting column (32) passes through the base (21) and allows the connecting seat (33) to be movably disposed inside the base (21). The inclined column (34) is formed on the inner end face of the base (21) and passes through the push plate (35) and is slidably connected to it.
4. The automatic injection molding production equipment for food packaging boxes according to claim 3, characterized in that: The connecting seat (33) has a groove (331) that mates with the push plate (35). The length of the groove (331) is greater than the length of the push plate (35), and the width of the connecting seat (33) is adapted to the width of the push plate (35). A notch is also formed at one end of the connecting seat (33) near the inclined column (34), and the inclined column (34) passes through the notch on the connecting seat (33).
5. The automatic injection molding production equipment for food packaging boxes according to claim 4, characterized in that: The push plate (35) is located on the side of the push rod (41) and close to the push rod (41), and the end of the push plate (35) close to the push rod (41) is set as an inclined surface.
6. An automatic injection molding production equipment for food packaging boxes according to any one of claims 3-5, characterized in that: An opening (24) is formed on the back side of the base (21), and the opening (24) faces the connecting seat (33).