Injection mold for folding bathtub envelope

Abstract

The utility model relates to a kind of injection mould of folding bath bucket package glue, belong to injection mould technical field.It includes top plate, and top plate bottom is equipped with the upper die of fixed connection, and upper die bottom is equipped with the middle die of fixed connection, and middle die bottom is equipped with the lower die of sliding connection, and middle die inside is equipped with the inner die of fixed connection with lower die, and lower die top is equipped with annular and the first forming part of upward extension, and upper die bottom is equipped with annular and the second forming part of downward extension, and first forming part and second forming part are located between middle die and inner die, and first forming part and middle die inner wall form first placement cavity, and second forming part and inner die outer wall form second placement cavity, and first forming part and second forming part form forming cavity between, and the both ends of forming cavity are connected with first placement cavity and second placement cavity respectively;In the scheme, only need to fill the forming cavity at glue wrapping, so that forming cavity can be filled more easily complete.

Description

Technical Field

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

[0002] A bathtub is a common bathing tool in people's lives. Existing technology includes a folding bathtub, which has the advantage of being foldable and easy to store compared to a regular bathtub, reducing the space it occupies indoors. A folding bathtub typically consists of an upper ring, a soft rubber tub in the middle, and a lower ring at the bottom. Because the diameter of the upper ring is larger than the lower ring, after folding the soft rubber tub in the middle, the upper ring can fit over the outside of the lower ring, reducing the height of the folding bathtub and making it easier to store.

[0003] Because folding bathtubs are made of plastic, they can be produced using injection molding. 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 filled, the mold is rapidly cooled, causing the molten plastic to solidify and form the desired plastic part. Injection molding offers advantages such as high precision and efficiency in producing plastic products. However, existing injection molds used for producing folding bathtubs still have some shortcomings. While they have molding cavities inside the mold to form the upper tub ring, soft rubber body, and lower tub ring, forming the entire folding bathtub product directly inside the mold in a single injection process, the elongated flow channels within the molding cavities can lead to incomplete filling. 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 folding bathtubs with rubber coating. The technical problem to be solved by this utility model is: how to avoid incomplete filling inside the molding cavity of the injection mold.

[0005] The objective of this utility model can be achieved through the following technical solution: an injection mold for a folding bathtub with rubber coating, comprising a top plate, an upper mold fixedly connected to the bottom of the top plate, a middle mold fixedly connected to the bottom of the upper mold, a lower mold slidably connected to the bottom of the middle mold, an inner mold fixedly connected to the lower mold inside the middle mold, a first forming part annularly extending upward at the top of the lower mold, and a second forming part annularly extending downward at the bottom of the upper mold. The first forming part and the second forming part are disposed between the middle mold and the inner mold. The first forming part and the inner wall of the middle mold form a first placement cavity, and the second forming part and the outer wall of the inner mold form a second placement cavity. The first forming part and the second forming part form a molding cavity, and the two ends of the molding cavity are respectively connected to the first placement cavity and the second placement cavity.

[0006] In this solution, after the lower mold separates from the middle mold, the pre-formed upper barrel ring is placed inside the first placement cavity, and the pre-formed lower barrel ring is placed inside the second placement cavity. Then, the mold is moved to close the mold. At this time, the first and second molding parts are inserted between the middle mold and the inner mold, forming a bent molding cavity between the first and second placement cavities. Molten soft rubber is injected into the molding cavity. After the melt cools and solidifies, a rubber-coated structure is formed inside the molding cavity, and the two ends of the rubber-coated structure are connected to the upper and lower barrel rings to form a complete folding bathtub. In this way, the folding bathtub is divided into three parts: the upper barrel ring, the lower barrel ring, and the rubber-coated structure. The upper barrel ring and the lower barrel ring structure are manufactured first, and then these two structures are placed into the first and second placement cavities respectively. In this injection molding process, only the molding cavity at the rubber-coated area needs to be filled, making it easier to fill the molding cavity completely and connecting the upper and lower barrel rings at both ends to form a complete folding bathtub product.

[0007] In the aforementioned injection mold for overmolding a folding bathtub, the upper mold contains several fixedly connected first cylinders. Each first cylinder is positioned directly above a first placement cavity. A piston rod is located at the bottom of each first cylinder, and this piston rod slidably passes through the middle mold and extends to the top of the first placement cavity. During demolding, the first cylinder controls the piston rod to push downwards, causing the upper tub ring to be demolded from the first placement cavity.

[0008] In the aforementioned injection mold for overmolding a folding bathtub, the upper mold contains several fixedly connected second cylinders. These second cylinders are positioned directly above the second placement cavity, and each second cylinder has a piston rod at its bottom, which slidably extends to the top of the second placement cavity. During demolding, the second cylinders control the piston rods to push downwards, causing the lower tub ring to be demolded from the second placement cavity.

[0009] In the above-mentioned injection mold for overmolding the folding bathtub, an upper tub ring is provided inside the first placement cavity, and a lower tub ring is provided inside the second placement cavity. One end of the upper tub ring and the lower tub ring is connected to the molding cavity.

[0010] In the aforementioned injection mold for overmolding a folding bathtub, the lower mold has an inwardly recessed groove on its side wall, and the interiors of both the lower and upper molds have several cooling channels distributed on both sides of the molding cavity. The groove facilitates the movement of the lower mold for mold closing or opening, and the injection of coolant into the cooling channels accelerates the cooling rate of the molten metal inside the molding cavity.

[0011] In the aforementioned injection mold for overmolding a folding bathtub, a feed inlet is provided on the top plate, and a flow-dividing mechanism is provided inside the top plate. The bottom of the feed inlet is connected to the flow-dividing mechanism, and the bottom of the flow-dividing mechanism is provided with several interconnected nozzles. The bottom of each nozzle passes through the upper mold and is connected to the molding cavity. Molten soft rubber, heated to a molten state, is injected from the feed inlet. After being diverted by the flow-dividing mechanism, it is evenly injected into the molding cavity from the nozzles at the bottom, completely filling the molding cavity.

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

[0013] 1. In this solution, the folding bathtub is divided into three parts: upper tub ring, lower tub ring, and rubber coating. First, the upper tub ring and lower tub ring structures are manufactured separately. Then, these two structures are placed into the first placement cavity and the second placement cavity, respectively. In this injection molding process, only the molding cavity of the rubber coating area needs to be filled, so that the molding cavity can be filled completely more easily. It can also connect the upper tub ring and the lower tub ring at both ends to form a complete folding bathtub product. Attached Figure Description

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

[0015] Figure 2 This is a front view cross-sectional structural diagram of the nozzle of this utility model;

[0016] Figure 3 This is a frontal cross-sectional structural diagram of the first and second cylinders of this utility model.

[0017] In the diagram, 1 is the top plate; 1a is the feed inlet; 1b is the flow divider; 1c is the nozzle; 2 is the upper mold; 2a is the second forming part; 2b is the first cylinder; 2c is the piston rod; 2d is the second cylinder; 3 is the middle mold; 4 is the lower mold; 4a is the first forming part; 4b is the groove; 5 is the inner mold; 6 is the first placement cavity; 6a is the upper barrel ring; 7 is the second placement cavity; 7a is the lower barrel ring; 8 is the forming cavity; and 9 is the cooling channel. Detailed Implementation

[0018] 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.

[0019] Example

[0020] like Figure 1As shown, the injection mold for the folding bathtub with rubber coating includes a top plate 1, an upper mold 2 fixedly connected to the bottom of the top plate 1, a middle mold 3 fixedly connected to the bottom of the upper mold 2, a lower mold 4 slidably connected to the bottom of the middle mold 3, a feed port 1a on the top plate 1, an inwardly recessed groove 4b on the side wall of the lower mold 4, and several cooling channels 9 inside the lower mold 4 and the upper mold 2.

[0021] like Figure 2 As shown, the middle mold 3 has an inner mold 5 fixedly connected to the lower mold 4 inside. The lower mold 4 has a first forming part 4a that is annular and extends upward at the top. The upper mold 2 has a second forming part 2a that is annular and extends downward at the bottom. The first forming part 4a and the second forming part 2a are located between the middle mold 3 and the inner mold 5. The first forming part 4a and the inner wall of the middle mold 3 form a first placement cavity 6. The second forming part 2a and the outer wall of the inner mold 5 form a second placement cavity 7. The first forming part 4a and the second forming part 2a form a forming cavity 8. The two ends of the forming cavity 8 are respectively connected to the first placement cavity 6 and the second placement cavity 7. The top plate 1 has a flow diversion mechanism 1b inside. The bottom of the feed port 1a is connected to the flow diversion mechanism 1b. The bottom of the flow diversion mechanism 1b has a plurality of connected nozzles 1c. The bottom of the nozzles 1c passes through the upper mold 2 and is connected to the forming cavity 8.

[0022] like Figure 3 As shown, the first placement cavity 6 is provided with an upper barrel ring 6a, and the second placement cavity 7 is provided with a lower barrel ring 7a. One end of the upper barrel ring 6a and the lower barrel ring 7a is connected to the molding cavity 8. The upper mold 2 is provided with a plurality of fixedly connected first cylinders 2b. The first cylinders 2b are respectively located directly above the first placement cavity 6. The bottom of the first cylinder 2b is provided with a piston rod 2c. The piston rod 2c at the bottom of the first cylinder 2b slides through the middle mold 3 and extends to the top of the first placement cavity 6. The upper mold 2 is provided with a plurality of fixedly connected second cylinders 2d. The second cylinders 2d are respectively located directly above the second placement cavity 7. The bottom of the second cylinder 2d is also provided with a piston rod 2c. The piston rod 2c at the bottom of the second cylinder 2d slides to the top of the second placement cavity 7.

[0023] The working principle of this solution is as follows: Figure 1-3As shown, after the lower mold 4 separates from the middle mold 3, the upper barrel ring 6a is placed inside the first placement cavity 6, and the lower barrel ring 7a is placed inside the second placement cavity 7. Then, the mold is moved to close the mold. The first molding part 4a and the second molding part 2a are inserted between the middle mold 3 and the inner mold 5, forming a bent molding cavity 8 between the first placement cavity 6 and the second placement cavity 7. The soft rubber melt heated to a molten state is injected from the feed port 1a. After being divided by the diversion mechanism 1b, it is evenly injected into the interior of the molding cavity 8 from the nozzle 1c at the bottom, completely filling the interior of the molding cavity 8. After cooling and molding, a bent rubber coating is formed inside the molding cavity 8, and the two ends of the rubber coating are connected to the upper barrel ring 6a and the lower barrel ring 7a to form a complete folded bath tub. Since only the molding cavity 8 at the rubber coating part needs to be filled, the molding cavity 8 can be filled completely more easily.

[0024] 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.

[0025] Although this document frequently uses terms such as 1. top plate; 1a. feed inlet; 1b. flow divider; 1c. nozzle; 2. upper mold; 2a. second forming part; 2b. first cylinder; 2c. piston rod; 2d. second cylinder; 3. middle mold; 4. lower mold; 4a. first forming part; 4b. groove; 5. inner mold; 6. first placement cavity; 6a. upper barrel ring; 7. second placement cavity; 7a. lower barrel ring; 8. forming cavity; 9. cooling channel, 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 overmolding a folding bathtub, comprising a top plate (1), wherein the bottom of the top plate (1) is provided with an upper mold (2) fixedly connected, the bottom of the upper mold (2) is provided with a middle mold (3) fixedly connected, the bottom of the middle mold (3) is provided with a lower mold (4) slidably connected, and the middle mold (3) is provided with an inner mold (5) fixedly connected to the lower mold (4), characterized in that, The lower mold (4) has a first forming part (4a) that is annular and extends upward at the top, and the upper mold (2) has a second forming part (2a) that is annular and extends downward at the bottom. The first forming part (4a) and the second forming part (2a) are located between the middle mold (3) and the inner mold (5). The first forming part (4a) and the inner wall of the middle mold (3) enclose a first placement cavity (6). The second forming part (2a) and the outer wall of the inner mold (5) enclose a second placement cavity (7). The first forming part (4a) and the second forming part (2a) enclose a forming cavity (8). The two ends of the forming cavity (8) are respectively connected to the first placement cavity (6) and the second placement cavity (7).

2. The injection mold for overmolding a folding bathtub according to claim 1, characterized in that, The upper mold (2) is provided with a plurality of fixed first cylinders (2b). The first cylinders (2b) are respectively located directly above the first placement cavity (6). The bottom of the first cylinder (2b) is provided with a piston rod (2c). The piston rod (2c) at the bottom of the first cylinder (2b) slides through the middle mold (3) and extends to the top of the first placement cavity (6).

3. The injection mold for overmolding a folding bathtub according to claim 2, characterized in that, The upper mold (2) is provided with several fixed second cylinders (2d). The second cylinders (2d) are respectively located directly above the second placement cavity (7). The bottom of the second cylinder (2d) is also provided with a piston rod (2c). The piston rod (2c) at the bottom of the second cylinder (2d) slides to the top of the second placement cavity (7).

4. The injection mold for overmolding a folding bathtub according to claim 1, characterized in that, The first placement cavity (6) is provided with an upper barrel ring (6a), and the second placement cavity (7) is provided with a lower barrel ring (7a). One end of the upper barrel ring (6a) and the lower barrel ring (7a) are connected to the molding cavity (8).

5. The injection mold for overmolding a folding bathtub according to claim 1, characterized in that, The lower mold (4) has an inwardly recessed groove (4b) on its side wall. The lower mold (4) and the upper mold (2) have several cooling channels (9) inside, which are distributed on both sides of the molding cavity (8).

6. The injection mold for overmolding a folding bathtub according to claim 1, characterized in that, The top plate (1) is provided with a feed inlet (1a), and the top plate (1) is provided with a flow-dividing mechanism (1b). The bottom of the feed inlet (1a) is connected to the flow-dividing mechanism (1b). The bottom of the flow-dividing mechanism (1b) is provided with several connected nozzles (1c). The bottom of the nozzles (1c) passes through the upper mold (2) and is connected to the molding cavity (8).

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