Injection mold for packaging box cover

Abstract

The utility model relates to an injection mold for a packaging box cover, and belongs to the technical field of molds. Comprising a top plate, a fixed mold plate, a cavity plate and a movable mold plate which are sequentially arranged, a plurality of fixedly-connected upper mold cores are arranged in the cavity plate, an upper forming face is arranged on the side, close to the movable mold plate, of each upper mold core, a plurality of corresponding lower forming faces are arranged on the movable mold plate, a forming cavity is defined by the upper forming faces and the lower forming faces, and a plurality of air inlet holes are formed in the side wall of the fixed mold plate. A plurality of one-way valves are arranged on the side, close to the upper forming face, in the upper mold core, a plurality of connected air inlet channels are arranged in the fixed mold plate and the upper mold core, one end of each air inlet channel is connected with the air inlet hole, and the other end of each air inlet channel is connected with the one-way valves. According to the scheme, the one-way valves are arranged in the upper mold core, molten liquid can be prevented from entering the air inlet channel, blockage is avoided, the one-way valves are evenly arranged at all positions of the upper mold core, when air is sprayed out of the air inlet channel, thrust borne by the box cover is more balanced, and the box cover is prevented from being damaged in the demolding process.

Description

TECHNICAL FIELD

[0001] The utility model belongs to mould technical field relates to a kind of injection mould of packing box cover. BACKGROUND

[0002] The packing box is used for storing food, and the packing box is usually composed of a box cover. The box cover can be combined on the top of the box body, so that a closed space is formed inside the box body, and the food in the packing box is prevented from spilling out. The box cover of the packing box is usually made of plastic material, and the plastic product can be produced by an injection mold. In the process of producing plastic products by the injection mold, the plastic raw material is heated to a molten state, and then injected into the formed cavity arranged in the mold. After the formed cavity is filled, the mold is rapidly cooled, and the molten plastic raw material is cooled and shaped to form the required plastic part. The injection mold has the advantages of high precision and high efficiency.

[0003] However, the existing packing box cover injection mold still has some shortcomings. Since the packing box cover is thin, the packing box cover is directly taken out from the formed cavity during mold demolding, which can cause uneven stress on the box cover and breakage, resulting in low yield and low production efficiency. SUMMARY

[0004] The utility model discloses a kind of injection moulds of packing box cover for the problems existing in prior art, and the technical problems to be solved by the utility model are as follows: how to avoid damage to the box cover during demolding.

[0005] The utility model discloses a kind of injection moulds of packing box cover, including top plate, fixed mold plate, cavity plate and movable mold plate arranged in sequence, the cavity plate inside is equipped with several fixed upper mold cores, the upper mold core is equipped with upper forming surface on the side close to movable mold plate, the movable mold plate is equipped with several corresponding lower forming surface, the upper forming surface and lower forming surface are enclosed to form forming cavity, the fixed mold plate side wall is equipped with several air inlet holes, the upper mold core inside is equipped with several check valves on the side close to upper forming surface, the inside of fixed mold plate and upper mold core is equipped with several connected air inlet channels, single air inlet channel is connected with air inlet hole at one end, and is connected with check valve at the other end.

[0006] In this design, molten plastic raw material is injected into the molding cavity and cooled and solidified inside the cavity, forming a shape corresponding to the upper and lower molding surfaces. During demolding, the moving mold plate separates from the cavity plate, and high-pressure gas is injected into the air inlet via an external air pump. The gas passes through the air inlet channel and is simultaneously ejected from the one-way valve, pushing the lid attached to the upper molding surface off. By using this method, multiple upper mold cores are installed inside the cavity plate, allowing multiple lid products to be produced in a single mold closing process. One-way valves inside the upper mold cores prevent molten metal from entering the air inlet channel, avoiding blockages. The one-way valves are evenly distributed throughout the upper mold cores, resulting in a more balanced pushing force on the lid during demolding, preventing damage during the demolding process.

[0007] In the injection mold for the aforementioned packaging box lid, the top plate is provided with several inlets, the fixed mold plate is provided with a flow-dividing mechanism connected to the inlets, and the upper mold core is provided with several nozzles. One end of each nozzle is connected to the flow-dividing mechanism, and the other end is connected to the molding cavity. After the plastic raw material is heated to a molten state, it is injected through the inlets. The flow-dividing mechanism ensures a more uniform flow of molten plastic into the nozzles, allowing multiple molding cavities to be filled simultaneously.

[0008] In the injection mold for the aforementioned packaging box lid, the top plate is fixedly connected to the fixed template, the fixed template is fixedly connected to the cavity plate, and the cavity plate is slidably connected to the moving template. The moving template can slidably separate from the cavity plate, thereby opening the molding cavity.

[0009] In the injection mold for the aforementioned packaging box lid, guide post sleeves are provided at the four corners of the fixed template, cavity plate, and moving template. Sliding guide posts are installed inside the guide post sleeves. The guide posts are positioned inside the guide post sleeves to achieve a sliding connection between the moving template and the cavity plate.

[0010] In the injection mold for the aforementioned packaging box lid, the top of the upper mold core is provided with an outwardly protruding snap-fit ​​portion. The bottom of the snap-fit ​​portion abuts against the cavity plate, and the snap-fit ​​portion is fixedly clamped between the cavity plate and the fixed mold plate. The snap-fit ​​portion is used to fix the position of the upper mold core in the cavity plate, making the internal structure of the mold more stable.

[0011] In the injection mold for the aforementioned packaging box lid, a base plate is fixedly connected to the side of the moving template away from the cavity plate. The side walls of both the moving template and the base plate have inwardly recessed slots. An external mold opening mechanism is connected to these slots and is used to pull the moving template to open the mold.

[0012] In the injection mold for the aforementioned packaging box lid, the moving mold plate has several cooling channels on its side wall, which surround the periphery of the molding cavity. These cooling channels accelerate the cooling rate of the molten liquid inside the molding cavity, thereby improving production efficiency.

[0013] Compared with the prior art, the utility model has the advantages of:

[0014] 1、 In this scheme, the one-way valve is arranged in the upper die core, the molten liquid can be prevented from entering the air inlet channel, and blockage is avoided, the one-way valves are evenly arranged at each place of the upper die core, in the demolding process, the pushing force on the box cover is more balanced, and the box cover is prevented from being damaged in the demolding process.

[0015] 2、 In this scheme, a plurality of upper die cores are arranged in the cavity plate, the interiors of a plurality of forming cavities can be filled in the one-time mold clamping process, and a plurality of box cover products are produced at the same time. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 is the three-dimensional structure schematic diagram of the utility model;

[0017] Figure 2 is the section structure schematic diagram of the utility model's movable die plate;

[0018] Figure 3 is the bottom view section structure schematic diagram of the utility model;

[0019] Figure 4 is Figure 3 the local enlarged structure schematic diagram in.

[0020] In the drawing, 1, top plate;1a, feed inlet;2, fixed die plate;2a, air inlet hole;2b, air inlet channel;2c, flow distribution mechanism;3, cavity plate;4, movable die plate;4a, cooling runner;4b, lower forming surface;5, bottom plate;5a, clamping groove;6, guide column sleeve;7, upper die core;7a, spray head;7b, one-way valve;7c, clamping part;7d, upper forming surface;8, forming cavity. DETAILED DESCRIPTION

[0021] The following is the specific embodiment of the utility model and is further described in combination with the drawings, but the utility model is not limited to these embodiments.

[0022] EMBODIMENT

[0023] As Figure 1 shown, the packing box cover's injection mold, including the top plate 1, one side of the top plate 1 is equipped with the fixed fixed die plate 2, the other side of the fixed die plate 2 is equipped with the fixed cavity plate 3, the other side of the cavity plate 3 is equipped with the sliding connection movable die plate 4, the other side of the movable die plate 4 is equipped with the fixed bottom plate 5, the sidewall of the movable die plate 4 and bottom plate 5 is equipped with the inward recessed clamping groove 5a, the top plate 1 is equipped with a plurality of feed inlets 1a, the sidewall of the fixed die plate 2 is equipped with a plurality of air inlet holes 2a.

[0024] As Figure 2 shown, the four corners of the fixed mold plate 2, cavity plate 3 and the moving mold plate 4 are provided with guide pillar sleeves 6, the inside of the guide pillar sleeves 6 is used for installing guide pillars, the inside of the fixed mold plate 2 is provided with several mutually unconnected air inlet channels 2b, the end of the air inlet channel 2b is connected with an air inlet hole 2a.

[0025] As Figure 3 combined Figure 4 shown, the inside of the cavity plate 3 is provided with several upper mold cores 7, the top of the upper mold core 7 is provided with a clamping part 7c protruding to the outside, the upper and lower sides of the clamping part 7c are respectively abutted with the fixed mold plate 2 and the cavity plate 3, the side of the upper mold core 7 close to the moving mold plate 4 is provided with an upper forming surface 7d, the moving mold plate 4 is provided with several corresponding lower forming surfaces 4b, the upper forming surface 7d and the lower forming surface 4b enclose to form a forming cavity 8, the inside of the upper mold core 7 is provided with a vertical air inlet channel 2b, the top of the air inlet channel 2b on the upper mold core 7 is connected with the air inlet channel 2b on the fixed mold plate 2, the inside of the upper mold core 7 is provided with several one-way valves 7b, the one-way valves 7b are evenly distributed in the inside of the upper mold core 7, the top of the one-way valve 7b is connected with the air inlet channel 2b, the bottom of the one-way valve 7b is connected with the forming cavity 8, the inside of the fixed mold plate 2 is provided with a flow distribution mechanism 2c connected with the feeding port 1a, the inside of the upper mold core 7 is provided with several spray heads 7a, one end of the spray head 7a is connected with the flow distribution mechanism 2c, the other end is connected with the forming cavity 8, the side wall of the moving mold plate 4 is provided with several cooling flow channels 4a, the cooling flow channels 4a surround the side of the forming cavity 8.

[0026] The working principle of the scheme is as follows, as Figures 1-4 shown, the plastic raw material is heated to a molten state and injected from the feeding port 1a, through the flow distribution effect of the flow distribution mechanism 2c, the plastic raw material is injected into the forming cavity 8 from the internal spray head 7a, after waiting for the inside of the forming cavity 8 to be filled completely, the cooling flow channel 4a rapidly cools the inside of the forming cavity 8, so that the plastic raw material forms a shape corresponding to the structure of the upper forming surface 7d and the lower forming surface 4b, then the moving mold plate 4 is moved to open the forming cavity 8, the external air pump injects high-pressure gas into the air inlet hole 2a, the gas passes through the air inlet channel 2b and is sprayed out from the one-way valve 7b at the same time, each part of the box cover product is subjected to a pushing force from the side of the upper mold core 7, so as to be separated from the upper forming surface 7d, realizing the function of automatic demolding, adopting this way to demold can make the external force on the box cover product more uniform, avoiding the damage of the box cover in the demolding process.

[0027] The specific embodiments described in the present document are only illustrative of the spirit of the present application. Those skilled in the art to which the present application belongs can make various modifications or supplements to the described specific embodiments or adopt similar ways to replace, but will not deviate from the spirit of the present application or exceed the scope defined by the appended claims.

[0028] Although the terms such as 1, top plate; 1a, feed inlet; 2, fixed die plate; 2a, air inlet hole; 2b, air inlet channel; 2c, flow distribution mechanism; 3, cavity plate; 4, movable die plate; 4a, cooling runner; 4b, lower forming surface; 5, bottom plate; 5a, clamping groove; 6, guide post sleeve; 7, upper die core; 7a, nozzle; 7b, one-way valve; 7c, clamping part; 7d, upper forming surface; 8, forming cavity, etc. are used more frequently herein, the possibility of using other terms is not excluded. The use of these terms is only for the convenience of describing and explaining the essence of the utility model; it is contrary to the spirit of the utility model to interpret them as any kind of additional limitation.

Claims

1. A kind of injection mould of packing box cover, including top plate (1) in turn, fixed mould plate (2), cavity plate (3) and movable mould plate (4), the inside of the cavity plate (3) is equipped with several fixed upper mould core (7), the side of the upper mould core (7) close to movable mould plate (4) is equipped with upper forming surface (7d), movable mould plate (4) is equipped with several corresponding lower forming surface (4b), the upper forming surface (7d) and lower forming surface (4b) are enclosed and form forming cavity (8), it is characterized in that, The fixed mold plate (2) is provided with a plurality of air inlet holes (2a) on the side wall, the upper mold core (7) is provided with a plurality of one-way valves (7b) on the side close to the upper forming surface (7d), the fixed mold plate (2) and the upper mold core (7) are provided with a plurality of connected air inlet channels (2b) in the interior, one end of the air inlet channel (2b) is connected with the air inlet hole (2a), and the other end is connected with the one-way valve (7b).

2. A box cover injection mold according to claim 1, wherein The top plate (1) is provided with a plurality of feeding ports (1a), the fixed mold plate (2) is provided with a flow distribution mechanism (2c) connected with the feeding port (1a) in the interior, the upper mold core (7) is provided with a plurality of spray heads (7a) in the interior, one end of the spray head (7a) is connected with the flow distribution mechanism (2c), and the other end is connected with the forming cavity (8).

3. The injection mold for packing box covers according to claim 1, characterized in that, The top plate (1) is fixedly connected with the fixed mold plate (2), the fixed mold plate (2) is fixedly connected with the cavity plate (3), and the cavity plate (3) is slidingly connected with the movable mold plate (4).

4. A box cover injection mold according to claim 3, wherein The fixed mold plate (2), the cavity plate (3) and the movable mold plate (4) are provided with guide pillar sleeves (6) at four corners, and the guide pillar sleeves (6) are internally provided with slidingly connected guide pillars.

5. A box cover injection mold according to claim 3, wherein The upper mold core (7) is provided with an outwardly protruding clamping portion (7c) at the top, the bottom of the clamping portion (7c) abuts against the cavity plate (3), and the clamping portion (7c) is fixedly clamped between the cavity plate (3) and the fixed mold plate (2).

6. The injection mold for packing box covers according to claim 1, characterized in that, The movable mold plate (4) is provided with a fixed bottom plate (5) away from the cavity plate (3), and the side wall of the movable mold plate (4) and the bottom plate (5) is provided with an inwardly recessed clamping groove (5a).

7. The injection mold for packing box covers according to claim 1, characterized in that, The movable mold plate (4) is provided with a plurality of cooling flow channels (4a) on the side wall, and the cooling flow channels (4a) surround the side of the forming cavity (8).

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