Injection mold for deep cavity of plastic storage box

Abstract

The utility model provides a deep cavity injection mold for a plastic storage box, and belongs to the field of injection molding. The mold comprises a movable mold plate and a fixed mold plate, a mold core is arranged in the movable mold plate, a box forming cavity is formed among the movable mold plate, the mold core and the fixed mold plate during mold closing, the two sides of the mold core are respectively provided with a plurality of box edge forming strips arranged in the fixed mold plate, the box edge forming strips extend into the box forming cavity, and the box edge forming strips are arranged in the box forming cavity. A box edge forming groove is formed between every two adjacent box edge forming strips, the box edge forming strips are connected with a demolding driving structure arranged in the fixed mold plate, and due to the fact that a plastic part is a deep-cavity containing box, if a traditional straight-ejection and inclined-ejection ejection mode is adopted, the plastic part is prone to being broken through ejection; therefore, the demolding driving structure located in the fixed mold plate is used for replacing a traditional straight-ejection and inclined-ejection ejection mode, a plastic part is not prone to deformation in the demolding process, and the product percent of pass is increased.

Description

Technical Field

[0001] This utility model belongs to the field of injection molding, and in particular relates to a deep cavity injection mold for a plastic storage box. Background Technology

[0002] Currently, injection molds are tools used to produce plastic products; they are also tools that give plastic products their complete structure and precise dimensions. Injection molding is a processing method used for the mass production of certain complex-shaped parts. Specifically, it refers to injecting molten plastic into a mold cavity under high pressure using an injection molding machine, and after cooling and solidification, obtaining the molded product. The types of molds vary depending on the product. Plastic storage boxes are popular with consumers due to their low price and convenience for storing and organizing materials. To increase storage capacity, deep-cavity storage boxes are needed. However, during the demolding process, due to the high adhesion between the plastic part and the mold, the plastic part is often easily twisted and deformed, leading to defects.

[0003] For example, a Chinese utility model patent discloses a thin-walled box injection mold [application number CN201720941087.1], including an upper mold assembly, a lower mold assembly, a liquid material channel, and a molding chamber disposed between the upper mold assembly and the lower mold assembly. The outlet end of the liquid material channel is connected to the molding chamber. One of the upper mold assembly and the lower mold assembly has a first sidewall, and the other has a second sidewall that cooperates with the first sidewall. A detachable adjusting block is installed on the first sidewall or the second sidewall, with one end face of the adjusting block abutting against the first sidewall and the other end face abutting against the second sidewall. After the upper mold assembly and the lower mold assembly are processed, if the sidewall of the injection-molded thin-walled box has uneven thickness, the adjusting block can be removed and its thickness processed to be thinner or replaced with a thicker adjusting block. Utility Model Content

[0004] The purpose of this invention is to address the above-mentioned problems by providing a deep cavity injection mold for plastic storage boxes.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] A deep cavity injection mold for a plastic storage box includes a moving mold plate and a fixed mold plate. The moving mold plate has a core inside. When the mold is closed, a box forming cavity is formed between the moving mold plate, the core, and the fixed mold plate. The core has several box edge forming strips on both sides, which are disposed in the fixed mold plate. The box edge forming strips extend into the box forming cavity. A box edge forming groove is formed between two adjacent box edge forming strips. The box edge forming strips are connected to a demolding drive structure disposed in the fixed mold plate.

[0007] In the aforementioned deep cavity injection mold for plastic storage boxes, the fixed template has a demolding drive cavity corresponding to the demolding drive structure. The demolding drive structure is located in the demolding drive cavity. The box edge forming strip is slidably connected to the fixed template. The demolding drive structure can drive the box edge forming strip to move out of the box forming cavity.

[0008] In the aforementioned deep cavity injection mold for plastic storage boxes, the demolding drive structure includes a geared disc that rotates within the demolding drive cavity. The geared disc is meshed with a toothed rod, and one end of the toothed rod is fixedly connected to the box edge forming strip.

[0009] In the aforementioned deep cavity injection mold for plastic storage boxes, the demolding drive structure also includes an ejector bar. The ejector bar is slidably connected to the fixed template. When the mold is closed, the outer surface of the end of the ejector bar near the box forming cavity abuts against the inner wall of the box forming cavity. The other end of the ejector bar is also connected to a toothed rod that meshes with the toothed disc.

[0010] In the aforementioned deep cavity injection mold for plastic storage boxes, the upper part of the box forming cavity has several box bottom support grooves set in a fixed template. The box bottom support grooves are connected to the box forming cavity, and an adhesive rod is provided in the box bottom support grooves.

[0011] In the aforementioned deep cavity injection mold for plastic storage boxes, the size of the adhesive rod is smaller than the size of the groove opening at the bottom of the box. The end of the adhesive rod near the box forming cavity is flush with the inner wall of the box forming cavity and serves as part of the inner wall of the box forming cavity.

[0012] In the aforementioned deep cavity injection mold for plastic storage boxes, several horizontal plates are also provided at the port of the bottom support groove near the box forming cavity.

[0013] In the aforementioned deep cavity injection mold for plastic storage boxes, several bottom support grooves are respectively set at the edge of the box forming cavity.

[0014] In the aforementioned deep cavity injection mold for plastic storage boxes, a locking rod is also provided in the demolding drive cavity. When the mold is closed, the locking rod abuts against the toothed rod connected to the molding strip on the side of the box, and the locking rod is slidably connected to the demolding drive cavity.

[0015] In the aforementioned deep cavity injection mold for plastic storage boxes, the locking rod is fixed on the moving template.

[0016] Compared with existing technologies, the advantages of this utility model are:

[0017] 1. Since the plastic part is a deep cavity storage box, the traditional straight and angled ejection method is easy to break the plastic part. Therefore, the demolding drive structure located in the fixed mold plate replaces the traditional straight and angled ejection method, so that the plastic part is not easily deformed during demolding and the product qualification rate is improved.

[0018] 2. During the demolding process, when the moving mold plate separates from the fixed mold plate, the box edge forming strip will push against the plastic part and move upward, so that the fixed mold plate and the plastic part move synchronously, so that the plastic part is separated from the moving mold plate and adheres to the fixed mold plate. Then, through the operation of the demolding drive structure, the box edge forming strip moves out of the box molding cavity and is separated from the plastic part, so that the plastic part can be easily removed from the fixed mold plate in the future.

[0019] 3. During the process of the molding strip moving and disengaging from the plastic part, the top strip moves towards the plastic part under the drive of the rotating toothed disc, and pushes the plastic part to disengage from the fixed template, so that the plastic part falls off the fixed template. Since the plastic part has a certain deformation capacity, the pushing of the top strip will not damage the plastic part.

[0020] 4. During the molding process, the plastic part will form a drag structure in the support groove at the bottom of the box, and the adhesion between the plastic part and the inner wall of the support groove at the bottom of the box will further increase the adhesion between the mold plate and the plastic part. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the overall design of this utility model;

[0022] Figure 2 yes Figure 1 A cross-sectional view;

[0023] Figure 3 yes Figure 2 A schematic diagram of the template structure.

[0024] In the figure: moving template 10, fixed template 11, core 12, box forming cavity 13, box side forming strip 14, box side forming groove 15, demolding drive structure 16, demolding drive cavity 17, gear plate 18, gear rod 19, top strip 20, box bottom support groove 21, adhesion rod 22, horizontal plate 23, locking rod 24. Detailed Implementation

[0025] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0026] This utility model provides a deep cavity injection mold for a plastic storage box, combined with... Figure 1-3As shown, it includes a moving template 10 and a fixed template 11. The moving template 10 is provided with a core 12. When the mold is closed, a box forming cavity 13 is formed between the moving template 10, the core 12 and the fixed template 11. The core 12 has a plurality of box edge forming strips 14 arranged in the fixed template 11 on both sides. The box edge forming strips 14 extend into the box forming cavity 13. A box edge forming groove 15 is formed between two adjacent box edge forming strips 14. The box edge forming strips 14 are connected to a demolding drive structure 16 arranged in the fixed template 11.

[0027] In this embodiment, the injection molding liquid is injected into the molding cavity 13 and cooled to form the mold. During the demolding process, the moving mold plate 10 and the fixed mold plate 11 move away from each other, and the plastic part adheres to the fixed mold plate 11. When the plastic part is completely separated from the moving mold plate 10, the demolding drive structure 16 located in the fixed mold plate 11 works to detach the plastic part from the fixed mold plate 11, thus completing the demolding. Since the plastic part is a deep cavity storage box, the traditional straight-push and angled-push ejection method is prone to breaking the plastic part. Therefore, the demolding drive structure 16 located in the fixed mold plate 11 replaces the traditional straight-push and angled-push ejection method, making the plastic part less prone to deformation during the demolding process and improving the product qualification rate.

[0028] The fixed template 11 is provided with a demolding drive cavity 17 corresponding to the demolding drive structure 16. The demolding drive structure 16 is disposed in the demolding drive cavity 17. The box edge forming strip 14 is slidably connected to the fixed template 11. The demolding drive structure 16 can drive the box edge forming strip 14 to move out of the box forming cavity 13.

[0029] In this embodiment, a box edge forming groove 15 is formed between two adjacent box edge forming strips 14 to form the box edge strip. When the moving template 10 and the fixed template 11 separate during the demolding process, the box edge forming strip 14 will push against the plastic part and move upward, so that the fixed template 11 and the plastic part move synchronously, so that the plastic part is detached from the moving template 10 and adheres to the fixed template 11. Then, through the operation of the demolding drive structure 16, the box edge forming strip 14 moves out of the box forming cavity 13 and detaches from the plastic part, so that the plastic part can be easily removed from the fixed template 11 in the future.

[0030] The demolding drive structure 16 includes a geared disc 18 that rotates within the demolding drive cavity 17. The geared disc 18 is meshed with a toothed rod 19, and one end of the toothed rod 19 is fixedly connected to the box edge forming strip 14.

[0031] In this embodiment, during the process of separating the box edge molding strip 14 from the plastic part, the rotation of the gear plate 18 causes the gear bar 19 to move, thereby driving the box edge molding strip 14 to move and separate from the plastic part.

[0032] The demolding drive structure 16 also includes an ejector bar 20, which is slidably connected to the fixed template 11. When the mold is closed, the outer surface of the end of the ejector bar 20 near the box forming cavity 13 abuts against the inner wall of the box forming cavity 13. The other end of the ejector bar 20 is also connected to a toothed rod 19 that meshes with the toothed disc 18.

[0033] In this embodiment, during the process of the side molding strip 14 moving and disengaging from the plastic part, the top strip 20 moves towards the plastic part under the drive of the rotating toothed disc 18, and pushes the plastic part to disengage from the fixed template 11, thereby causing the plastic part to fall off the fixed template 11. Since the plastic part has a certain deformation capacity, the pushing action of the top strip 20 will not damage the plastic part.

[0034] The box forming cavity 13 has several box bottom support grooves 21 arranged in the fixed template 11 above it. The box bottom support grooves 21 are connected to the box forming cavity 13, and the box bottom support grooves 21 are provided with adhesive rods 22.

[0035] In this embodiment, the plastic part adheres to the adhesion rod 22 during the molding process. As the fixed template 11 and the moving template 10 separate, the adhesion rod 22 increases the adhesion strength between the fixed template 11 and the plastic part.

[0036] The size of the adhesive rod 22 is smaller than the size of the groove opening of the box bottom support groove 21. The end of the adhesive rod 22 near the box forming cavity 13 is flush with the inner wall of the box forming cavity 13 and serves as part of the inner wall of the box forming cavity 13.

[0037] In this embodiment, during the molding process, the plastic part will form a bottom support structure in the bottom support groove 21, and the adhesion force generated between the plastic part and the inner wall of the bottom support groove 21 will further increase the adhesion between the template 11 and the plastic part.

[0038] The bottom support groove 21 of the box is also provided with several horizontal plates 23 near the port of the box forming cavity 13.

[0039] In this embodiment, the plastic part adheres to the horizontal plate 23 during the molding process. As the fixed mold plate 11 separates from the moving mold plate 10, the horizontal plate 23 increases the adhesion between the fixed mold plate 11 and the plastic part.

[0040] Several box bottom support grooves 21 are respectively set at the edge of the box forming cavity 13.

[0041] In this embodiment, the adhesion force generated between the several bottom support grooves 21 and the plastic part is evenly distributed on the bottom of the plastic part, making the force more uniform and enabling it to complete the demolding step better.

[0042] The demolding drive cavity 17 is also provided with a locking rod 24. When the mold is closed, the locking rod 24 abuts against the toothed rod 19 connected to the box edge forming strip 14, and the locking rod 24 is slidably connected to the demolding drive cavity 17.

[0043] In this embodiment, during the injection molding process, the locking rod 24 abuts against the toothed rod 19, thereby preventing the toothed rod 19 from moving and thus locking the toothed disc 18, preventing molding failure caused by the toothed rod 19 driving the box edge forming strip 14 to move under high pressure injection molding.

[0044] The locking rod 24 is fixed on the moving template 10.

[0045] In this embodiment, the locking rod 24 is locked in place by fixing the moving template 10 and the fixed template 11. As the moving template 10 and the fixed template 11 separate, the locking rod 24 automatically disengages from the toothed rod 19.

[0046] The specific embodiments described herein are merely illustrative examples illustrating the spirit of this utility model. Those skilled in the art to which this utility model pertains may make various modifications or additions to the described specific embodiments or use similar methods to substitute them, without departing from the spirit of this utility model or exceeding the scope defined by the appended claims.

[0047] Although this article frequently uses terms such as moving template 10, fixed template 11, core 12, box forming cavity 13, box side forming strip 14, box side forming groove 15, demolding drive structure 16, demolding drive cavity 17, gear plate 18, gear 19, top strip 20, box bottom support groove 21, adhesion rod 22, horizontal plate 23, locking rod 24, etc., these terms are used merely for the convenience of describing and explaining the essence of this utility model; interpreting them as any kind of additional limitation would be contrary to the spirit of this utility model.

Claims

1. A deep cavity injection mold for a plastic storage box, comprising a movable mold plate (10) and a fixed mold plate (11), characterized in that, The movable mold plate (10) is internally provided with a core (12), and a box forming cavity (13) is formed between the movable mold plate (10), the core (12) and the fixed mold plate (11) when the mold is closed.

2. The plastic storage bin deep cavity injection mold of claim 1, wherein, The fixed mold plate (11) is internally provided with a demolding driving cavity (17) corresponding to the demolding driving structure (16), the demolding driving structure (16) is arranged in the demolding driving cavity (17), the box edge forming strip (14) is in sliding connection with the fixed mold plate (11), and the demolding driving structure (16) can drive the box edge forming strip (14) to move out of the box forming cavity (13).

3. The plastic storage bin deep cavity injection mold of claim 2, wherein, The demolding driving structure (16) comprises a gear disc (18) rotating in the demolding driving cavity (17), the gear disc (18) is in meshing connection with a gear rod (19), and one end of the gear rod (19) is fixedly connected with the box edge forming strip (14).

4. The plastic storage bin deep cavity injection mold of claim 3, wherein, The demolding driving structure (16) further comprises a stripper (20), the stripper (20) is in sliding connection with the fixed mold plate (11), and the outer surface of the end portion of the stripper (20) close to the box forming cavity (13) is in abutment with the inner wall of the box forming cavity (13) when the mold is closed.

5. The plastic storage bin deep cavity injection mold of claim 1, wherein, The upper portion of the box forming cavity (13) is provided with a plurality of box bottom support grooves (21) arranged in the fixed mold plate (11), the box bottom support grooves (21) are in communication with the box forming cavity (13), and the box bottom support grooves (21) are internally provided with an adhering rod (22).

6. The plastic storage bin deep cavity injection mold of claim 5, wherein, The size of the adhering rod (22) is smaller than that of the slot of the box bottom support groove (21), the end portion of the adhering rod (22) close to the box forming cavity (13) is flush with the inner wall of the box forming cavity (13) and serves as a part of the inner wall of the box forming cavity (13).

7. The plastic storage bin deep cavity injection mold of claim 6, wherein, The box bottom support groove (21) is further provided with a plurality of cross plates (23) at the port close to the box forming cavity (13).

8. The plastic storage bin deep cavity injection mold of claim 6, wherein, The plurality of box bottom support grooves (21) are arranged at the edges of the box forming cavity (13), respectively.

9. The plastic storage bin deep cavity injection mold of claim 4, wherein, The demolding driving cavity (17) is further provided with a locking rod (24), the locking rod (24) is in abutment with the gear rod (19) connected with the box edge forming strip (14) when the mold is closed, and the locking rod (24) is in sliding connection with the demolding driving cavity (17).

10. The plastic storage bin deep cavity injection mold of claim 9, wherein, The locking rod (24) is fixedly arranged on the movable mold plate (10).

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