Spoon injection mold for secondary ejection demolding

Abstract

The utility model relates to a spoon injection mold for secondary ejection demolding, and belongs to the technical field of injection molds. Comprising a top plate, a fixed mold plate, a movable mold plate, a connecting plate, a foot plate and a bottom plate, a flow dividing cavity and a plurality of forming cavities are formed between the fixed mold plate and the movable mold plate, a first push plate and a second push plate which move in a reciprocating mode are arranged in the foot plate, the flow dividing cavity is formed in the center of the movable mold plate, and the forming cavities are arranged on the outer side of the flow dividing cavity in a surrounding mode; the end, close to the center of the movable mold plate, of the forming cavity is connected with the flow dividing cavity, a plurality of fixedly-connected first ejector pins are arranged on the first push plate, and a plurality of fixedly-connected second ejector pins are arranged on the second push plate. According to the scheme, filling of the forming cavity can be more complete through the flow dividing cavity, the first ejector pin can eject the spoon out for the second time, the spoon can be completely separated from the forming cavity, meanwhile, the spoon can be bent and broken with the connecting piece in the flow dividing cavity, secondary machining and separation are not needed, and the production efficiency is improved.

Description

Technical Field

[0001] This utility model belongs to the field of injection mold technology and relates to a spoon injection mold with secondary ejection and demolding. Background Technology

[0002] Plastic spoons are a type of cutlery widely used in the food delivery industry. Because they are made of plastic, they can be manufactured using injection molding. Molten plastic is injected into the molding cavity of the mold. After the cavity is filled, the mold is rapidly cooled, allowing the plastic to solidify and form a spoon with a specific shape. An internal mechanism then ejects the spoon from the mold. Injection molding is a highly efficient and precise method for producing spoons.

[0003] However, the existing spoon injection mold structure still has some shortcomings. Due to the small size of the spoon, multiple molding cavities are usually set inside the mold. Multiple spoon products are produced in one molding and injection process. However, there are problems such as uneven filling inside the molding cavity and ejection during demolding, which leads to defective products in the production process and reduces production efficiency. Summary of the Invention

[0004] The purpose of this invention is to address the problems existing in the current technology by proposing a spoon injection mold with secondary ejection and demolding. The technical problem to be solved by this invention is: how to improve the production efficiency of spoon injection molds.

[0005] The objective of this utility model can be achieved through the following technical solution: A spoon injection mold with secondary ejection and demolding includes a top plate, a fixed template, a moving template, a connecting plate, a foot plate, and a bottom plate. A flow distribution cavity and several molding cavities are provided between the fixed template and the moving template. A first push plate and a second push plate that reciprocate are provided inside the foot plate. The flow distribution cavity is located at the center of the moving template. The molding cavities are arranged around the outside of the flow distribution cavity. One end of the molding cavity near the center of the moving template is connected to the flow distribution cavity. Several first ejector pins are fixedly connected on the first push plate. The first ejector pins pass through the moving template and extend to the bottom of the molding cavity. Several second ejector pins are fixedly connected on the second push plate. The second ejector pins pass through the first push plate and the moving template and extend to the bottom of the flow distribution cavity.

[0006] In this scheme, the plastic raw material heated to a molten state is injected into the distribution cavity. After being distributed by the distribution cavity, it flows evenly into the outer molding cavity to prevent incomplete filling of the molding cavity. After the molding cavity is filled, the mold is rapidly cooled to allow the plastic raw material to cool and solidify. Then, the moving platen is moved to open the mold. The external ejection mechanism pushes the first and second push plates to move towards one side of the molding cavity. The first and second ejector pins are driven to extend from the bottom of the driven platen, ejecting the plastic parts inside the distribution cavity and the molding cavity. Then, the first push plate is pushed to move separately, and the first ejector pin continues to push the molded spoon product inside the molding cavity outward, so that the spoon can be completely separated from the molding cavity. At the same time, the spoon will bend and break with the connecting part in the distribution cavity, eliminating the need for secondary processing and separation, thus improving production efficiency.

[0007] In the aforementioned spoon injection mold with secondary ejection and demolding, the base plate is provided with a slidingly connected push rod. One end of the push rod passes through the second push plate and is fixedly connected to the first push plate. Through the push rod structure, the first push plate can be pushed independently to move towards the moving mold plate side.

[0008] In the aforementioned spoon injection mold with secondary ejection and demolding, the top plate is provided with a feed port, and a nozzle is connected to the bottom of the feed port. The bottom of the nozzle is connected to the center of the distribution cavity. Molten plastic raw material enters from the feed port and is injected into the distribution cavity through the nozzle.

[0009] In the aforementioned spoon injection mold with secondary ejection and demolding, the nozzle is equipped with a reciprocating needle valve inside, and a cylinder is located at the top of the nozzle. Inside the cylinder is a slidingly connected piston, which is fixedly connected to the needle valve. The cylinder controls the movement of the needle valve; downward movement of the needle valve blocks the bottom of the nozzle, stopping the nozzle from feeding material into the distribution chamber, while upward movement of the needle valve opens the nozzle, allowing material to be fed into the distribution chamber, thus achieving precise control of the mold's feeding process.

[0010] In the aforementioned spoon injection mold with secondary ejection and demolding, the top plate is provided with a first air inlet channel and a second air inlet channel. The first air inlet channel is connected to the top of the cylinder, and the second air inlet channel is connected to the bottom of the cylinder. When air enters through the first air inlet channel, the piston moves downward, causing the needle valve to move downward. When air enters through the second air inlet channel, the piston moves upward, causing the needle valve to move upward.

[0011] In the aforementioned spoon injection mold with secondary ejection and demolding, a heating element is fixedly connected to the fixed mold plate near the moving mold plate. The heating element contains a heating wire and surrounds the bottom outer side of the nozzle. The bottom of the heating element is connected to the flow distribution cavity. The heating element heats the molten metal in the nozzle and flow distribution cavity, maintaining its fluidity and increasing the speed of filling the molding cavity, resulting in a more complete filling.

[0012] In the aforementioned spoon injection mold with secondary ejection and demolding, the connection between the flow divider cavity and the molding cavity is provided with an inlet with an opening size smaller than that of the molding cavity and the flow divider cavity. This inlet makes the connection opening between the molding cavity and the flow divider cavity even smaller, making it easier for the connecting parts between the spoon and the flow divider cavity to bend and break during the secondary ejection process.

[0013] In the aforementioned spoon injection mold with secondary ejection and demolding, the moving and fixed mold plates are equipped with several cooling channels, which are distributed on the upper and lower sides of the molding cavity. After the molding cavity is completely filled, coolant flows into the cooling channels, causing the molding cavity to cool down rapidly and improving the mold's production efficiency.

[0014] Compared with the prior art, the present invention has the following advantages:

[0015] In this design, since the molding cavity is arranged around the outside of the distribution cavity, the plastic raw material heated to a molten state is injected into the distribution cavity. After being distributed by the distribution cavity, it flows evenly into the outer molding cavity, preventing incomplete filling inside the molding cavity.

[0016] In this solution, the first and second push plates are pushed to move towards one side of the molding cavity. The first and second ejector pins are driven to extend from the bottom of the driven template, pushing out the plastic parts inside the flow distribution cavity and the molding cavity. Then, the first push plate is pushed to move separately, and the first ejector pin continues to push the molded spoon product inside the molding cavity outward, so that the spoon can be completely separated from the molding cavity. At the same time, the spoon will bend and break with the connecting part in the flow distribution cavity, eliminating the need for secondary processing and separation, thus improving production efficiency. Attached Figure Description

[0017] Figure 1 This is a three-dimensional structural diagram of the present invention;

[0018] Figure 2 This is a frontal half-sectional view of the structure of this utility model;

[0019] Figure 3 yes Figure 2 A magnified schematic diagram of the local structure;

[0020] Figure 4 This is a schematic diagram of the structure of the forming cavity and the flow distribution cavity on the moving template of this utility model.

[0021] In the diagram, 1 is the top plate; 1a is the feed inlet; 1b is the first air inlet channel; 1c is the second air inlet channel; 1d is the nozzle; 1d1 is the needle valve; 2 is the fixed template; 2a is the cooling channel; 3 is the moving template; 4 is the connecting plate; 5 is the foot plate; 5a is the first push plate; 5a1 is the first ejector pin; 5b is the second push plate; 5b1 is the second ejector pin; 6 is the bottom plate; 6a is the push rod; 7 is the cylinder; 7a is the piston; 8 is the flow distribution chamber; 8a is the molding chamber; 8b is the glue inlet; 9 is the heating element; 9a is the heating wire. Detailed Implementation

[0022] 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. Example

[0023] like Figure 1 As shown, a spoon injection mold with secondary ejection and demolding includes a top plate 1. A fixed template 2 is fixedly connected to one side of the top plate 1. A movable template 3 is slidably connected to the other side of the fixed template 2. A connecting plate 4 is fixedly connected to the other side of the movable template 3. A foot plate 5 is fixedly connected to the other side of the connecting plate 4. A bottom plate 6 is fixedly connected to the other side of the foot plate 5. A feed port 1a is provided on the top plate 1. A first air intake channel 1b and a second air intake channel 1c are provided inside the top plate 1. Cooling channels 2a are provided on the side walls of the fixed template 2 and the movable template 3.

[0024] like Figure 2 Combination Figure 3As shown, a flow-diverting cavity 8 and several forming cavities 8a are provided between the fixed template 2 and the moving template 3. The foot plate 5 has a reciprocating first push plate 5a and a second push plate 5b. The first push plate 5a has several fixedly connected first ejector pins 5a1, which pass through the moving template 3 and extend to the bottom of the forming cavity 8a. The second push plate 5b has several fixedly connected second ejector pins 5b1, which pass through the first push plate 5a and the moving template 3 and extend to the bottom of the flow-diverting cavity 8. The base plate 6 has a slidably connected push rod 6a, one end of which passes through the second push plate 5b and is fixedly connected to the first push plate 5a. A fixed heating element is provided on the side of the fixed template 2 near the moving template 3. Component 9, the heating element 9 has a heating wire 9a inside, the heating element 9 surrounds the bottom outside of the nozzle 1d, the bottom of the heating element 9 is connected to the flow distribution cavity 8, the flow distribution cavity 8 is provided with a small glue inlet 8b at the connection between the flow distribution cavity 8 and the molding cavity 8a, the bottom of the feed inlet 1a is connected to the nozzle 1d, the bottom of the nozzle 1d is connected to the center of the flow distribution cavity 8, the nozzle 1d has a reciprocating needle valve 1d1 inside, the nozzle 1d has a cylinder 7 at the top, the cylinder 7 has a slidingly connected piston 7a inside, the piston 7a is fixedly connected to the needle valve 1d1, the first air inlet channel 1b is connected to the top of the cylinder 7, and the second air inlet channel 1c is connected to the bottom of the cylinder 7.

[0025] like Figure 4 As shown, the flow-dividing cavity 8 is located at the center of the moving template 3, and the forming cavity 8a is arranged around the outside of the flow-dividing cavity 8. The flow-dividing cavity 8 has a mesh structure that diffuses outward from the center. The end of the forming cavity 8a near the center of the moving template 3 is connected to the flow-dividing cavity 8.

[0026] The working principle of this solution is as follows: Figure 1-4As shown, the plastic raw material heated to a molten state enters through the inlet 1a and is injected into the distribution cavity 8 through the nozzle 1d. After being distributed by the distribution cavity 8, it flows evenly into the outer molding cavity 8a to prevent incomplete filling of the molding cavity 8a. After the molding cavity 8a is filled, the mold is rapidly cooled to allow the plastic raw material to cool and solidify. A spoon-shaped product will be formed inside the molding cavity 8a, and a connecting piece for connecting the spoons will be formed inside the distribution cavity 8. Then, the moving platen 3 is moved to open the mold, and the first push plate 5a and the second push plate 5b are pushed to one side of the molding cavity 8a by the external ejection mechanism. The first ejector pin 5a1 and the second ejector pin 5b1 are driven to extend from the bottom of the moving platen 3, ejecting the plastic parts inside the distribution cavity 8 and the molding cavity 8a. Pushing the push rod 6a again moves the first push plate 5a, and the first ejector pin 5a1 continues to push the forming cavity 8a outward to form the spoon product, so that the spoon can be completely separated from the forming cavity 8a. At the same time, the spoon will bend and break with the middle connecting part, without the need for secondary processing and separation, thus improving production efficiency.

[0027] 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.

[0028] Although this document frequently uses terms such as 1. top plate; 1a. feed inlet; 1b. first air inlet channel; 1c. second air inlet channel; 1d. nozzle; 1d1. needle valve; 2. fixed template; 2a. cooling channel; 3. moving template; 4. connecting plate; 5. foot plate; 5a. first push plate; 5a1. first ejector pin; 5b. second push plate; 5b1. second ejector pin; 6. bottom plate; 6a. push rod; 7. cylinder; 7a. piston; 8. flow divider; 8a. molding cavity; 8b. glue inlet; 9. heating element; 9a. heating wire, 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 additional limitation would contradict the spirit of this utility model.

Claims

1. A spoon injection mold with secondary ejection and demolding, comprising a top plate (1), a fixed template (2), a movable template (3), a connecting plate (4), a foot plate (5), and a bottom plate (6), wherein a flow distribution cavity (8) and a plurality of molding cavities (8a) are provided between the fixed template (2) and the movable template (3), and the foot plate (5) is provided with a first push plate (5a) and a second push plate (5b) that reciprocate, characterized in that, The flow divider (8) is located at the center of the moving template (3). The forming cavity (8a) is arranged around the outside of the flow divider (8). The end of the forming cavity (8a) near the center of the moving template (3) is connected to the flow divider (8). The first push plate (5a) is provided with a plurality of fixed first ejector pins (5a1). The first ejector pins (5a1) pass through the moving template (3) and extend to the bottom of the forming cavity (8a). The second push plate (5b) is provided with a plurality of fixed second ejector pins (5b1). The second ejector pins (5b1) pass through the first push plate (5a) and the moving template (3) and extend to the bottom of the flow divider (8).

2. The spoon injection mold for secondary ejection and demolding according to claim 1, characterized in that, The base plate (6) is provided with a slidingly connected push rod (6a), one end of which passes through the second push plate (5b) and is fixedly connected to the first push plate (5a).

3. The spoon injection mold for secondary ejection and demolding according to claim 1, characterized in that, The top plate (1) is provided with a feed inlet (1a), and a nozzle (1d) is connected to the bottom of the feed inlet (1a). The bottom of the nozzle (1d) is connected to the center of the diversion cavity (8).

4. The spoon injection mold for secondary ejection and demolding according to claim 3, characterized in that, The nozzle (1d) is equipped with a reciprocating needle valve (1d1) inside, and a cylinder (7) is provided on the top of the nozzle (1d). The cylinder (7) is equipped with a sliding piston (7a) inside, and the piston (7a) is fixedly connected to the needle valve (1d1).

5. A spoon injection mold for secondary ejection and demolding according to claim 3, characterized in that, The top plate (1) is provided with a first air intake channel (1b) and a second air intake channel (1c). The first air intake channel (1b) is connected to the top of the cylinder (7), and the second air intake channel (1c) is connected to the bottom of the cylinder (7).

6. The spoon injection mold for secondary ejection and demolding according to claim 2, characterized in that, A heating element (9) is fixedly connected to the fixed template (2) on the side near the moving template (3). The heating element (9) has a heating wire (9a) inside. The heating element (9) surrounds the bottom outside of the nozzle (1d). The bottom of the heating element (9) is connected to the diversion cavity (8).

7. The spoon injection mold for secondary ejection and demolding according to claim 1, characterized in that, The connection between the flow distribution cavity (8) and the molding cavity (8a) is provided with an inlet (8b) with an opening size smaller than that of the molding cavity (8a) and the flow distribution cavity (8).

8. The spoon injection mold for secondary ejection and demolding according to claim 1, characterized in that, The moving template (3) and the fixed template (2) are provided with a number of cooling channels (2a), which are distributed on the upper and lower sides of the molding cavity (8a).

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