Injection mold of packaging box

Abstract

The utility model relates to an injection mold of a packing box, and belongs to the technical field of injection molds. Comprising a top plate, a splitter plate, a fixed mold plate, a movable mold plate and a bottom plate which are arranged in sequence, a plurality of forming parts are arranged at the joint of the fixed mold plate and the movable mold plate and fixedly connected with the movable mold plate, a forming cavity is formed between the forming parts and the fixed mold plate, and a reciprocating push plate is arranged in the bottom plate and provided with a plurality of fixedly-connected ejector rods. The movable mold plate is provided with a demolding plate in sliding connection, the demolding plate is arranged on the peripheral side of the bottom of the forming part in a surrounding mode, the demolding plate, the forming part and the fixed mold plate jointly define a closed forming cavity, and the ejector rod is fixedly connected with the demolding plate. According to the scheme, the edge of the packaging box can be subjected to thrust of the demolding plate at the same time, so that stress on the packaging box is more uniform, deformation or damage is not prone to occurring, meanwhile, due to the fact that the multiple forming parts are arranged on the movable mold plate, the push plate can eject packaging box products formed on the multiple forming parts out and demold at the same time, and the production efficiency is improved.

Description

Technical Field

[0001] This utility model belongs to the field of injection mold technology, and relates to an injection mold for a packaging box. Background Technology

[0002] With the development of the food delivery industry, the market demand for packaging boxes is constantly increasing. Since packaging boxes are usually made of plastic, they can be manufactured using injection molds. An injection mold is a piece of equipment used to produce plastic products. The plastic raw material is heated to a molten state and then injected into a pre-designed molding cavity inside the mold. Once the cavity is full, the mold is rapidly cooled, and the molten plastic material solidifies, forming a plastic part of a specific shape. Using injection molds to produce plastic products offers advantages such as high precision and high efficiency.

[0003] However, existing packaging box injection molds still have some shortcomings. The packaging box material is relatively soft, and during the demolding process, directly pushing out the packaging box product with ejector pins can easily lead to uneven force on the packaging box, resulting in deformation or damage, and causing defective products in the production process. Summary of the Invention

[0004] The purpose of this utility model is to address the problems existing in the current technology by proposing an injection mold for packaging boxes. The technical problem to be solved by this utility model is: how to avoid uneven stress on the packaging box products during the demolding process.

[0005] The objective of this utility model can be achieved through the following technical solution: An injection mold for a packaging box includes a top plate, a flow divider plate, a fixed template, a moving template, and a bottom plate arranged in sequence. Several molding parts are provided at the connection between the fixed template and the moving template. The molding parts are fixedly connected to the moving template. A molding cavity is provided between the molding parts and the fixed template. A reciprocating push plate is provided inside the bottom plate. Several fixed push rods are provided on the push plate. A slidably connected ejector plate is provided on the moving template. The ejector plate is arranged around the bottom periphery of the molding parts. The ejector plate, the molding parts, and the fixed template together enclose a closed molding cavity. The push rods are fixedly connected to the ejector plate.

[0006] In this design, multiple sealed molding cavities are formed by a release mold, molded parts, and a fixed mold. Plastic material is heated to a molten state and injected into the molding cavities. After rapid cooling inside the mold, a packaged box product forms inside the molding cavity. A moving mold opens the mold, and the packaged box product adheres to one side of the moving mold. An external mechanism pushes a push plate inward, which in turn moves an ejector rod upward. The ejector rod pushes the release mold out from inside the moving mold, demolding the top of the packaged box product from the molded parts. Because the release mold is arranged around the bottom periphery of the molded parts, the edges of the packaged box are simultaneously subjected to the pushing force of the release mold during ejection, resulting in more even stress distribution on the packaged box and reducing the likelihood of deformation or breakage. Furthermore, the multiple molded parts on the moving mold allow the push plate to simultaneously eject packaged box products from multiple molded parts, improving production efficiency.

[0007] In the injection mold of the aforementioned packaging box, the top plate is provided with several inlets, and the flow divider plate is provided with a flow divider mechanism. The bottom of the inlets is connected to the flow divider mechanism. Molten plastic is injected from the inlets and flows into the flow divider mechanism at the bottom.

[0008] In the injection mold of the aforementioned packaging box, the bottom of the flow-dividing mechanism is provided with several interconnected nozzles. The bottom of each nozzle extends into the molding cavity, and each molding cavity is provided with an interconnected nozzle. After being diverted by the flow-dividing mechanism, the molten liquid flows evenly into the nozzles, and the molten liquid is injected into the molding cavity from the bottom of the nozzles.

[0009] In the injection mold for the aforementioned packaging boxes, both the moving and fixed mold plates consist of two independent sections. A separate push plate is provided between each moving and fixed mold plate, and four molding parts are mounted on each moving mold plate. Two moving and fixed mold plates are arranged inside the mold, increasing the internal space and allowing for the formation of more packaging box products in a single injection molding process.

[0010] In the injection mold of the aforementioned packaging box, the two ends of the push plate extend to the bottom of the two moving mold plates respectively. The push plate is fixedly connected to the two push plates by multiple ejector rods. The two ends of the push plate extend outward in a "+" shape, and the ejector rods are located at the ends of the push plate. Through the structure of the push plate, the push plate can simultaneously control the ejection of the two side mold plates, enabling synchronous demolding of the two moving mold plates. The "+" shape structure can more stably push the mold plates.

[0011] In the injection mold of the aforementioned packaging box, the moving template and the bottom plate have several air holes on their side walls, and the moving template and the bottom plate have several air inlet channels inside. One end of each air inlet channel is connected to an air hole, and the other end extends to the bottom of the molded part. During the demolding process, high-pressure gas can also be injected from the air holes, and the high-pressure gas is ejected from the bottom of the molded part to assist in the demolding of the packaging box.

[0012] In the injection mold for the aforementioned packaging box, the side walls of the fixed mold plate and the moving mold plate are provided with several inlets and outlets. The interiors of the fixed mold plate and the moving mold plate are provided with several cooling channels, the two ends of which are connected to the inlets and outlets. These cooling channels are distributed around the periphery of the molding cavity. The cooling channels are arranged around the upper and lower sides of the molding cavity to facilitate rapid cooling of the mold interior by the coolant.

[0013] Compared with the prior art, the present invention has the following advantages:

[0014] 1. In this solution, since the demolding template is arranged around the bottom periphery of the molded part, the edge of the packaging box can be pushed by the demolding template at the same time during the ejection process, making the stress on the packaging box more uniform and less prone to deformation or breakage. At the same time, since multiple molded parts are set on the moving template, the push plate can eject the packaging box products formed on multiple molded parts at the same time, improving production efficiency. Attached Figure Description

[0015] Figure 1 This is a three-dimensional structural diagram of the present invention;

[0016] Figure 2 This is a top sectional view of the nozzle of this utility model;

[0017] Figure 3 yes Figure 2 A magnified schematic diagram of the local structure;

[0018] Figure 4 This is a top view half-section structural diagram of this utility model;

[0019] Figure 5 This is a schematic diagram of the internal open state structure of the moving template of this utility model.

[0020] In the diagram, 1 is the top plate; 1a is the feed inlet; 2 is the flow divider plate; 2a is the flow divider mechanism; 2b is the nozzle; 3 is the fixed template; 3a is the water inlet; 3b is the water outlet; 3c is the cooling channel; 4 is the moving template; 4a is the air hole; 4b is the air inlet channel; 5 is the bottom plate; 6 is the push plate; 6a is the push rod; 7 is the molded part; 8 is the molding cavity; and 9 is the demolding template. Detailed Implementation

[0021] The following are specific embodiments of the present invention, which are described in conjunction with the accompanying drawings. However, the present invention is not limited to these embodiments.

[0022] Example

[0023] like Figure 1 As shown, the injection mold for the packaging box includes a top plate 1, a flow divider 2, a fixed template 3, a moving template 4, and a bottom plate 5 arranged in sequence. The moving template 4 and the fixed template 3 in a mold are composed of two independent plates. The bottom plate 5 is provided with a reciprocating push plate 6. The two ends of the push plate 6 extend to the bottom of the two moving templates 4 respectively. The two ends of the push plate 6 extend outward in a "+" shape. The side walls of the moving template 4 and the bottom plate 5 are provided with a number of air holes 4a. The side walls of the fixed template 3 and the moving template 4 are provided with a number of water inlets 3a and water outlets 3b.

[0024] like Figure 2 Combination Figure 3 As shown, a plurality of forming parts 7 are provided at the connection between the fixed template 3 and the moving template 4. The forming parts 7 are fixedly connected to the moving template 4, and a forming cavity 8 is provided between the forming parts 7 and the fixed template 3. A release template 9 is provided on the moving template 4 and is slidably connected. The release template 9 is arranged around the bottom periphery of the forming parts 7. The release template 9, the forming parts 7, and the fixed template 3 together enclose and form a closed forming cavity 8. A plurality of feed inlets 1a are provided on the top plate 1. A flow diversion mechanism 2a is provided inside the flow diversion plate 2. The bottom of the feed inlets 1a is connected to the flow diversion mechanism 2a. The bottom of the mechanism 2a is provided with several connected nozzles 2b. The bottom of the nozzles 2b extends to the forming cavity 8. Each forming cavity 8 is provided with a connected nozzle 2b. The moving template 4 and the bottom plate 5 are provided with several air inlet channels 4b. One end of the air inlet channel 4b is connected to the air hole 4a, and the other end extends to the bottom of the formed part 7. The fixed template 3 and the moving template 4 are provided with several cooling channels 3c. The two ends of the cooling channels 3c are connected to the water inlet 3a and the water outlet 3b. The cooling channels 3c are distributed around the periphery of the forming cavity 8.

[0025] like Figure 4 Combination Figure 5 As shown, the push plate 6 is provided with several fixed push rods 6a. The push rods 6a are located at the ends of the push plate 6, and the other ends of the push rods 6a are fixedly connected to the demolding template 9. The two moving templates 4 are respectively provided with four forming parts 7. The push plate 6 is arranged around the bottom periphery of the four forming parts 7. The push plate 6 is fixedly connected to the two push plates 6 by multiple push rods 6a.

[0026] The working principle of this solution is as follows: Figure 1-5As shown, after the plastic material is heated to a molten state, it is injected from the inlet 1a and flows into the bottom diversion mechanism 2a. After the diversion mechanism 2a, the molten liquid flows evenly into the nozzle 2b. The molten liquid is injected into the molding cavity 8 from the bottom of the nozzle 2b. When the molding cavity 8 is filled, coolant flows into the cooling channel 3c, so that the mold is cooled quickly. The packaging box product will be formed inside the molding cavity 8. The moving template 4 opens the mold, and the packaging box product will be attached to one side of the moving template 4. The push plate 6 is pushed inward by the external mechanism. The push plate 6 drives the ejector rod 6a to move upward at the same time. The ejector rod 6a pushes the ejector plate 9 out of the moving template 4. At the same time, gas is ejected from the air inlet channel 4b to assist the ejector plate 9 in demolding and remove the top of the packaging box product from the molded part 7.

[0027] Since the ejector plate 9 is arranged around the bottom periphery of the molded part 7, the edge of the packaging box can be pushed by the ejector plate 9 at the same time during the ejection process, making the force on the packaging box more uniform and less prone to deformation or damage. At the same time, since multiple molded parts 7 are set on the moving plate 4, the push plate 6 can eject the packaging box products formed on multiple molded parts 7 at the same time, improving production efficiency.

[0028] 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.

[0029] Although this document frequently uses terms such as 1. top plate; 1a. feed inlet; 2. flow divider; 2a. flow divider mechanism; 2b. nozzle; 3. fixed template; 3a. water inlet; 3b. water outlet; 3c. cooling channel; 4. moving template; 4a. air hole; 4b. air inlet channel; 5. bottom plate; 6. push plate; 6a. ejector rod; 7. molded part; 8. molding cavity; 9. demolding, etc., the possibility of using other terms is not excluded. The use of these terms is merely for the convenience of describing and explaining the essence of this utility model; interpreting them as any kind of additional limitation would contradict the spirit of this utility model.

Claims

1. A packing box injection mold, comprising a top plate (1), a distributor plate (2), a fixed mold plate (3), a movable mold plate (4) and a bottom plate (5) arranged in sequence, a plurality of forming parts (7) are arranged at the joint of the fixed mold plate (3) and the movable mold plate (4), the forming parts (7) are fixedly connected with the movable mold plate (4), and a forming cavity (8) is arranged between the forming parts (7) and the fixed mold plate (3), characterized in that, The bottom plate (5) is internally provided with a reciprocating push plate (6), the push plate (6) is provided with a plurality of fixed top rods (6a), the movable die plate (4) is provided with a slidingly connected stripping plate (9), the stripping plate (9) is circumferentially arranged at the bottom of the forming part (7), the stripping plate (9), the forming part (7) and the fixed die plate (3) jointly form a closed forming cavity (8), and the top rod (6a) is fixedly connected with the stripping plate (9).

2. A box packing injection mold according to claim 1, characterized in that, The top plate (1) is provided with a plurality of feeding ports (1a), the internal part of the flow distribution plate (2) is provided with a flow distribution mechanism (2a), and the bottom of the feeding port (1a) is connected with the flow distribution mechanism (2a).

3. A box packing injection mold according to claim 2, wherein The bottom of the flow distribution mechanism (2a) is provided with a plurality of connected spray heads (2b), the bottom of the spray head (2b) extends to the forming cavity (8), and each forming cavity (8) is provided with a connected spray head (2b).

4. A box packing injection mold according to claim 1, wherein The movable die plate (4) and the fixed die plate (3) are both composed of two independent plate blocks, the movable die plate (4) and the fixed die plate (3) are separately provided with a push plate (6), and the movable die plate (4) is provided with four forming parts (7).

5. A box packing injection mold according to claim 4, wherein The two ends of the push plate (6) extend to the bottom of the two movable die plates (4), the push plate (6) is fixedly connected with the two push plates (6) through a plurality of top rods (6a), the two ends of the push plate (6) extend outward in a "cross" shape, and the top rod (6a) is arranged at the end of the push plate (6).

6. A box packing injection mold according to claim 1, wherein The side walls of the movable die plate (4) and the bottom plate (5) are provided with a plurality of air holes (4a), the internal parts of the movable die plate (4) and the bottom plate (5) are provided with a plurality of air inlet channels (4b), one end of the air inlet channel (4b) is connected with the air hole (4a), and the other end extends to the bottom of the forming part (7).

7. A box packing injection mold according to claim 1, wherein The side walls of the fixed die plate (3) and the movable die plate (4) are provided with a plurality of water inlets (3a) and water outlets (3b), the internal parts of the fixed die plate (3) and the movable die plate (4) are provided with a plurality of cooling flow channels (3c), the two ends of the cooling flow channel (3c) are connected with the water inlet (3a) and the water outlet (3b), and the cooling flow channel (3c) is distributed on the circumferential side of the forming cavity (8).

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