Injection mold for square barrel

Abstract

The utility model relates to an injection mold for a square barrel, 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 sequentially arranged, the movable mold plate is provided with a forming part protruding outwards, a forming cavity is formed between the forming part and the fixed mold plate, an air inlet hole is formed in the side wall of the movable mold plate, and an air inlet channel connected with the air inlet hole is formed in the movable mold plate and extends to the bottom of the forming cavity; an annular piece in sliding connection is arranged in the movable mold plate and arranged at the bottom of the forming part in a surrounding and sleeving mode, and a plurality of push rods in sliding connection are arranged in the bottom plate. According to the scheme, the square barrel is pushed by gas and the annular piece to be demoulded at the same time, the upper end and the lower end of the square barrel can be stressed uniformly, the square barrel is not prone to being pulled and deformed, the annular piece surrounds the bottom of the forming part, in the demoulding process, the side wall of the bottom of the square barrel can be stressed uniformly, and the square barrel product is prevented from being damaged in the demoulding process.

Description

Technical Field

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

[0002] A square bucket is a container used to store items. Square buckets made of plastic can be produced using injection molds. Inside the injection mold, there is a molding cavity to form the square bucket structure. After the plastic raw material is heated to a molten state, it is injected into the molding cavity of the mold. When the molding cavity is filled, it is rapidly cooled to allow the raw material inside to cool and solidify, forming a square bucket product corresponding to the structure of the molding cavity. Then, the square bucket is ejected from the mold by an ejector pin, completing the production process.

[0003] However, existing square barrel injection molds still have some shortcomings. Because the walls of the square barrel are thin and the barrel body is long, using ejector pins to eject the square barrel during the mold ejection and demolding process can easily cause uneven force on the square barrel, resulting in product quality defects. 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 a square barrel. The technical problem to be solved by this utility model is: how to avoid uneven stress on the square barrel during the demolding process.

[0005] The objective of this utility model can be achieved through the following technical solution: An injection mold for a square barrel includes a top plate, a flow divider plate, a fixed template, a moving template, and a bottom plate arranged in sequence. The moving template has an outwardly protruding forming part, and a forming cavity is provided between the forming part and the fixed template. An air inlet is provided on the side wall of the moving template, and an air inlet channel connected to the air inlet is provided inside the moving template. The air inlet channel extends to the bottom of the forming cavity. A slidably connected annular member is provided inside the moving template. The annular member is sleeved around the bottom of the forming part. The forming part, the annular member, and the fixed template together form a closed forming cavity. A plurality of slidably connected push rods are provided inside the bottom plate, and one end of the push rod is fixedly connected to the annular member.

[0006] In this design, molten plastic heated to a molten state is cooled and molded in a molding cavity, forming a square barrel product with a specific structure. After the moving mold and the fixed mold separate, gas is injected into the air inlet and ejected from the molding section, pushing the top of the barrel to separate from the moving mold. At the same time, the push rod inside the bottom plate is pushed upward, and the push rod drives the ring component to be ejected from inside the moving mold. The ring component pushes the bottom of the barrel, causing the side wall of the barrel to separate from the moving mold. By using gas and the ring component to push the barrel out of the mold simultaneously, the upper and lower ends of the barrel can be subjected to uniform force, making it less prone to stretching and deformation. Since the ring component is wrapped around the bottom of the molding section, the bottom side wall of the barrel can be subjected to uniform force during the demolding process, avoiding damage to the barrel product during demolding.

[0007] In the injection mold of the aforementioned square barrel, the top plate is provided with a feed inlet, and the manifold plate is provided with a manifold mechanism. The bottom of the feed inlet is connected to the manifold mechanism, and the manifold mechanism is provided with several nozzles. The bottom of each nozzle is connected to the molding cavity. Molten plastic heated to a molten state is injected from the feed inlet, flows into the internal manifold mechanism, is evenly distributed to the nozzles at the bottom, and is injected into the molding cavity through the nozzles.

[0008] In the injection mold for the aforementioned square barrel, the moving mold plate has two identical forming parts, each with a forming cavity between it and the moving mold plate. The flow distribution mechanism has two nozzles, each extending into the forming cavity. By setting two forming cavities in one mold, two square barrel products can be produced simultaneously, improving production efficiency.

[0009] In the injection mold of the aforementioned square barrel, a heating wire is provided on the outside of the flow-dividing mechanism, a junction box is provided on the flow-dividing plate, and a heating element is located inside the fixed mold plate, surrounding the bottom outer side of the nozzle. The heating wire heats the flow-dividing mechanism, maintaining the fluidity of the molten liquid inside the mechanism. The heating element heats the inside of the nozzle, maintaining the fluidity of the molten liquid inside the nozzle. The junction box is connected to the heating wire and the heating element for power supply.

[0010] In the injection mold of the aforementioned square barrel, guide sleeves are fixedly connected at the four corners of the manifold, and guide posts are provided at the four corners of the base plate. The guide posts are slidably inserted into the guide sleeves and are located on the outside of the fixed and moving mold plates. Placing the guide posts and guide sleeves outside the mold allows for a slidable connection between the moving and fixed mold plates, while also reducing the space occupied inside the mold.

[0011] In the injection mold of the aforementioned square barrel, the bottom plate has several cooling holes on its side wall, and the bottom plate has cooling channels connected to the cooling holes, extending upwards to the bottom of the molding section. Coolant is injected into the cooling channels to rapidly cool the molding cavity.

[0012] Compared with the prior art, the present invention has the following advantages:

[0013] 1. In this solution, gas and annular components are used to push the square barrel to demold simultaneously, which can make the upper and lower ends of the square barrel evenly stressed and less prone to stretching and deformation. Since the annular component is wrapped around the bottom of the molding part, the bottom side wall of the square barrel can be evenly stressed during the demolding process, thus avoiding damage to the square barrel product during demolding. Attached Figure Description

[0014] Figure 1 This is a three-dimensional structural diagram of the present invention;

[0015] Figure 2 This is a frontal half-sectional view of the structure of this utility model;

[0016] Figure 3 This is a cross-sectional structural diagram of the push rod part of this utility model;

[0017] Figure 4 This is a schematic diagram of the internal open state structure of the moving template of this utility model.

[0018] In the diagram, 1 is the top plate; 1a is the feed inlet; 1b is the guide sleeve; 2 is the flow divider plate; 2a is the junction box; 3 is the fixed template; 3a is the heating element; 4 is the moving template; 4a is the forming part; 4b is the air inlet; 4b1 is the air inlet channel; 5 is the bottom plate; 5a is the guide post; 5b is the cooling hole; 5c is the cooling channel; 5d is the push rod; 6 is the flow divider mechanism; 6a is the nozzle; 6b is the heating wire; 7 is the forming cavity; and 8 is the ring part. Detailed Implementation

[0019] 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.

[0020] Example

[0021] like Figure 1 As shown, the injection mold for a square barrel includes a top plate 1, a flow divider plate 2 fixedly connected to the rear of the top plate 1, a fixed template 3 fixedly connected to the rear of the flow divider plate 2, a slidingly connected movable template 4 located behind the fixed template 3, and a bottom plate 5 fixedly connected to the rear of the movable template 4. The top plate 1 has a feed inlet 1a, the flow divider plate 2 has a junction box 2a, the side wall of the movable template 4 has several air inlets 4b, the four corners of the flow divider plate 2 and the top plate 1 have fixedly connected guide sleeves 1b, and the four corners of the bottom plate 5 have guide posts 5a. The guide posts 5a are slidably inserted into the guide sleeves 1b and are located on the outside of the fixed template 3 and the movable template 4.

[0022] like Figure 2 As shown, the moving template 4 has two outwardly protruding forming parts 4a, and a forming cavity 7 is provided between the forming parts 4a and the fixed template 3. The bottom plate 5 has several cooling holes 5b on its side wall, and a cooling channel 5c connected to the cooling holes 5b is provided inside the bottom plate 5. The cooling channel 5c extends upward to the bottom of the forming part 4a. The flow divider 2 has a flow divider mechanism 6 inside, and the bottom of the feed inlet 1a is connected to the flow divider mechanism 6. The flow divider mechanism 6 has several nozzles 6a, and the bottom of each nozzle 6a extends into the forming cavity 7. A heating wire 6b is provided outside the flow divider mechanism 6. A heating element 3a is provided inside the fixed template 3, and the heating element 3a surrounds the bottom of the nozzle 6a.

[0023] like Figure 3 Combination Figure 4 As shown, the moving template 4 has a slidingly connected annular component 8 inside, which is sleeved around the bottom of the forming part 4a. The forming part 4a, the annular component 8, and the fixed template 3 together form a closed forming cavity 7. The bottom plate 5 has a plurality of slidingly connected push rods 5d inside, one end of which is fixedly connected to the annular component 8. The moving template 4 has an air intake channel 4b1 inside, one end of which is connected to the air intake hole 4b, and the other end extends to the bottom of the forming cavity 7.

[0024] The working principle of this solution is as follows: Figure 1-4 As shown, molten plastic heated to a molten state is injected from the inlet 1a and flows into the internal distribution mechanism 6, where it is evenly distributed to the nozzles 6a at the bottom. The molten plastic is then injected into the two molding cavities 7 through the nozzles 6a, forming a square barrel product with a specific structure. After the moving mold plate 4 and the fixed mold plate 3 are separated, gas is injected into the air inlet 4b. The gas is ejected from the molding section 4a through the air inlet channel 4b1, pushing the top of the barrel away from the moving mold plate 4. Simultaneously, the push rod 5d inside the bottom plate 5 is pushed upwards, causing the annular component 8 to be ejected from inside the moving mold plate 4. The annular component 8 pushes the bottom of the barrel, separating the sidewalls of the barrel from the moving mold plate 4. Using gas and the annular component 8 to simultaneously push the barrel out of the mold ensures even force distribution at both ends, preventing stretching and deformation. Since the annular component 8 surrounds the bottom of the molding section 4a, it ensures even force distribution on the bottom sidewalls of the barrel during demolding, preventing damage to the barrel product.

[0025] 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.

[0026] Although this document frequently uses terms such as 1. top plate; 1a. feed inlet; 1b. guide sleeve; 2. flow divider; 2a. junction box; 3. fixed template; 3a. heating element; 4. moving template; 4a. forming part; 4b. air inlet; 4b1. air inlet channel; 5. bottom plate; 5a. guide post; 5b. cooling hole; 5c. cooling channel; 5d. push rod; 6. flow divider mechanism; 6a. nozzle; 6b. heating wire; 7. forming cavity; 8. ring part, 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. An injection mold for a square barrel, comprising a top plate (1), a flow divider plate (2), a fixed mold plate (3), a moving mold plate (4), and a bottom plate (5) arranged sequentially, wherein the moving mold plate (4) has an outwardly protruding forming part (4a), a forming cavity (7) is provided between the forming part (4a) and the fixed mold plate (3), an air inlet (4b) is provided on the side wall of the moving mold plate (4), and an air inlet channel (4b1) connected to the air inlet (4b) is provided inside the moving mold plate (4), the air inlet channel (4b1) extending to the bottom of the forming cavity (7), characterized in that, The moving template (4) has a slidingly connected annular part (8) inside. The annular part (8) is sleeved around the bottom of the forming part (4a). The forming part (4a), the annular part (8) and the fixed template (3) together form a closed forming cavity (7). The bottom plate (5) has a plurality of slidingly connected push rods (5d) inside. One end of the push rod (5d) is fixedly connected to the annular part (8).

2. An injection mold for square tubs according to claim 1, characterized in that, The top plate (1) is provided with a feed inlet (1a), and the flow divider plate (2) is provided with a flow divider mechanism (6). The bottom of the feed inlet (1a) is connected to the flow divider mechanism (6). The flow divider mechanism (6) is provided with a plurality of nozzles (6a), and the bottom of the nozzles (6a) is connected to the molding cavity (7).

3. An injection mold for square tubs according to claim 2, characterized in that, The moving template (4) is provided with two identical forming parts (4a), and a forming cavity (7) is provided between the forming part (4a) and the moving template (4). The flow diversion mechanism (6) is provided with two nozzles (6a), and the nozzles (6a) extend into the forming cavity (7) respectively.

4. The injection mold for square tubs of claim 2, wherein, The diversion mechanism (6) is provided with a heating wire (6b) on the outside, the diversion plate (2) is provided with a junction box (2a), the fixed template (3) has a heating element (3a) inside, and the heating element (3a) surrounds the bottom outside of the nozzle (6a).

5. The injection mold for square tubs of claim 1, wherein, The diverter plate (2) has guide sleeves (1b) fixed at its four corners, and the base plate (5) has guide posts (5a) at its four corners. The guide posts (5a) are slidably inserted into the guide sleeves (1b) and are located on the outside of the fixed template (3) and the moving template (4).

6. The injection mold for square tubs of claim 1, wherein, The bottom plate (5) has a plurality of cooling holes (5b) on its side wall, and the bottom plate (5) has a cooling channel (5c) connected to the cooling holes (5b) inside, and the cooling channel (5c) extends upward to the bottom of the forming part (4a).

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