Mould for EPS (Expandable Polystyrene) foam plastic product

Abstract

The utility model relates to a mould for EPS (Expandable Polystyrene) foam plastic products, which comprises an upper mould and a lower mould which can be mutually assembled up and down, the lower mould is provided with a forming cavity and a cooling cavity, the bottom wall of the lower mould is provided with a plurality of drainage holes communicated with the cooling cavity, the bottom of the lower mould is also provided with a spraying pipeline, the spraying pipeline is provided with a plurality of spraying openings, and the spraying openings are communicated with the cooling cavity. The spraying openings extend towards the wall of the lower die, the spraying pipeline is externally connected with a water inlet pipe, and the spraying openings spray cooling liquid towards the wall of the lower die so that the bottom wall of the lower die can be rapidly cooled. And all-around rapid cooling treatment on the lower die can be achieved, the structure is simple, and practicability is high.

Description

Technical Field

[0001] The utility model relates to the technical field of injection molds, in particular to a mold for EPS foam products. Background Art

[0002] EPS injection mold is a kind of mold used for casting to plasticize the workpiece. Generally, the molten plastic liquid is shaped by the cooperation of the fixed mold and the movable mold. The melted resin material is injected into the metal model to obtain a product with a certain shape.

[0003] In the prior art, in order to achieve rapid cooling of the injection mold, a cooling cavity is generally provided in the upper mold and the lower mold, and a plurality of drainage holes for the coolant to flow out are arranged on the mold wall of the lower mold. After the mold is closed and the molding is completed, the external coolant is flushed into the cooling channel to quickly cool the mold, and then the coolant is discharged outward through the drainage holes.

[0004] The current cooling method has the following problems in the actual production process: In order to achieve rapid cooling of the lower mold, the cooling cavity has different structural layouts according to the inner cavity of the lower mold, and the cooling cavity needs to be adaptively arranged according to the cross-section of the molding cavity. This results in the upper part of the lower mold wall being thicker and the thinner part being thinner. At the same time, the drainage holes set on the lower mold are distributed at high and low points. This results in the coolant entering the lower mold and being discharged from the drainage holes before it can exchange heat with the lower mold in time. The coolant is even discharged from the drainage holes before it fills the cooling cavity. This results in the lower mold cooling down slowly or incompletely, and the lower mold cannot be completely cooled to the set temperature, which greatly affects the molding quality and molding efficiency. Utility Model Content

[0005] The purpose of the utility model is to provide a mold for EPS foam products, so as to solve the problem in the prior art that the lower mold cannot be thoroughly cooled due to the arrangement of the mold cooling cavity, resulting in the inability to ensure the molding quality.

[0006] In order to solve the above problems, the EPS foam product mold involved in the present invention adopts the following technical solutions:

[0007] A mold for EPS foam products includes an upper mold and a lower mold that can be clamped together. The lower mold has a molding cavity and a cooling cavity. The bottom wall of the lower mold is provided with a plurality of drainage holes connected to the cooling cavity. The bottom of the lower mold is also provided with a spray pipe. The spray pipe is provided with a plurality of spray ports, which extend toward the lower mold wall. The spray pipe is externally connected to a water inlet pipe. Each spray port sprays coolant toward the lower mold wall to quickly cool the bottom wall of the lower mold.

[0008] In a preferred embodiment, the spray pipe has two or more longitudinal pipes, each longitudinal pipe is arranged parallel to each other and spaced apart, one end of each longitudinal pipe is connected to a transverse pipe, and the side wall of the transverse pipe is connected to the water inlet pipe.

[0009] In a preferred embodiment, there are more than two water inlet pipes, which are arranged side by side at intervals along the circumference of the horizontal pipe.

[0010] In a preferred embodiment, the bottom wall of the lower mold has a laterally extending concave portion, and the spray pipe also includes a branch pipe arranged above the longitudinal pipe and extending laterally, an intermediate pipe is connected between the branch pipe and the longitudinal pipe, there are multiple intermediate pipes, which are connected to each longitudinal pipe one by one, and the spray port is arranged on the upper part of the side wall of the branch pipe.

[0011] In a preferred embodiment, the bottom of the lower mold is connected to a mold clamping seat, the cross-sectional size of the mold clamping seat is consistent with the cross-sectional size of the bottom of the lower mold, and the spray pipe is connected to the mold clamping seat.

[0012] In a preferred embodiment, a connecting piece is fixed on one side wall of the clamping base, the longitudinal tube is fixed on the connecting piece, a mounting hole is arranged on the other side wall of the clamping base, and the water inlet pipe is fixed in the mounting hole.

[0013] As described above, the utility model has the following beneficial effects: compared with the prior art, the EPS foam product mold involved in the utility model, in actual use, through the additional design of the spray pipe and the spray port, after the upper mold and the lower mold are closed for molding, the coolant enters the cooling chamber to quickly cool the lower mold, and at the same time, the spray pipe is assisted to open, and the coolant is quickly sprayed on the bottom wall of the lower mold to quickly cool the lower mold wall. Thus, the lower mold is quickly cooled by the synchronous action of the coolant in the cooling chamber and the coolant sprayed from the spray pipe, thereby achieving rapid demoulding, thereby ensuring the molding quality and molding efficiency of the product after demoulding.

[0014] Furthermore, the cooling liquid sprayed in the additional spray pipe can quickly take away the heat on the lower mold wall, the heat exchange efficiency is higher, and the lower mold can be quickly cooled and cooled in all directions. It has a simple structure and strong practicality. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for use in the embodiments:

[0016] Figure 1 This is a schematic structural diagram of a specific embodiment of a mold for EPS foam products of the present invention;

[0017] Figure 2 for Figure 1 Bottom view of

[0018] Figure 3 for Figure 2 Structural status diagram of the middle spray pipe.

[0019] Explanation of the reference numerals: 1-lower mold; 2-upper mold; 3-mold clamping base; 4-spray pipe; 5-longitudinal pipe; 6-horizontal pipe; 7-water inlet pipe; 8-branch pipe; 9-middle pipe; 10-connecting piece; 11-mounting hole; 12-spray port; 13-connecting rod. DETAILED DESCRIPTION

[0020] In order to make the technical objectives, technical solutions, and beneficial effects of the present invention more clear, the technical solutions of the present invention are further described below with reference to the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention. That is, the embodiments described herein are only some embodiments of the present invention, not all embodiments. Generally, the components of the embodiments of the present invention described and illustrated herein can be arranged and designed in a variety of different configurations.

[0021] It should be noted that when an element is referred to as being "disposed on" another element, it may be directly on the other element or there may also be an intermediate element. When an element is considered to be "connected" to another element, it may be directly connected to the other element or there may be an intermediate element at the same time. The terms "first", "second" and similar words do not indicate any order, quantity or importance, but are only used to distinguish different components. The terms "installed", "connected" and "connected" should be understood in a broad sense. For example, it can be a mechanical connection or an electrical connection, or it can be the internal communication of two elements, it can be directly connected, or it can be indirectly connected through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms can be understood according to the specific circumstances. The terms "vertical", "horizontal", "up", "down", "left", "right" and similar expressions used herein are for illustrative purposes only and do not represent the only implementation method.

[0022] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art to which this application pertains. The terms used herein in the specification of this application are for the purpose of describing specific embodiments only and are not intended to limit this application. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0023] The specific embodiment of the EPS foam product mold involved in the present utility model is as follows: Figures 1 to 3As shown, the mold for EPS foam products includes an upper mold 2 and a lower mold 1 that can be clamped together. The lower mold 1 has a molding cavity and a cooling cavity. The bottom wall of the lower mold 1 is provided with a plurality of drainage holes connected to the cooling cavity. The structure and layout of the molding cavity and the cooling cavity of the lower mold 1 are consistent with the prior art and are not described in detail. A cooling liquid inlet (not shown in the figure) is also provided on the side wall of the lower mold 1 for injecting cooling liquid into the cooling cavity.

[0024] The bottom of the lower mold 1 is also provided with a spray pipe 4, such as Figure 2 As shown, the bottom wall of the lower mold 1 has a transversely extending concave portion and two convex portions spaced apart and arranged side by side in the longitudinal direction, thereby forming a wavy, curved surface structure on the bottom wall of the lower mold 1. A spray pipe 4 is arranged below the lower mold 1 to spray coolant onto the bottom wall of the lower mold 1 to quickly cool it.

[0025] Specifically, a clamping die seat 3 is fixedly connected to the bottom of the lower die 1 . The cross-sectional dimensions of the clamping die seat 3 are consistent with the cross-sectional dimensions of the bottom of the lower die 1 . The spray pipe 4 is connected to the clamping die seat 3 .

[0026] In order to fix the spray pipe 4, a connecting piece 10 is fixed on one longitudinal side wall of the clamping base 3, and a mounting hole 11 is arranged on the other side wall of the clamping base 3. The spray pipe 4 is installed between the mounting hole 11 and the connecting piece 10.

[0027] As for the spray pipe 4, a plurality of spray ports 12 are arranged on the spray pipe 4, and the spray ports 12 extend toward the wall of the lower mold 1. The spray pipe 4 is externally connected to a water inlet pipe 7. Each spray port 12 sprays coolant toward the wall of the lower mold 1 to quickly cool the bottom wall of the lower mold 1.

[0028] Preferably, in order to achieve overall spraying of the bottom wall of the lower mold 1, the spray pipe 4 has two longitudinal pipes 5, each longitudinal pipe 5 is arranged parallel to each other and spaced apart, one end of each longitudinal pipe 5 is connected to a transverse pipe 6, and the side wall of the transverse pipe 6 is connected to the above-mentioned water inlet pipe 7.

[0029] In order to realize the installation of the spray pipe 4 on the clamping base 3, the longitudinal pipe 5 is fixed on the connecting piece 10, and the water inlet pipe 7 is fixed in the mounting hole 11. Specifically, connecting rods 13 are connected to both ends of the transverse pipe. The connecting rods 13 are fixedly connected to the connecting piece 10. The connecting rods 13 extend longitudinally and are distributed on both sides of the longitudinal pipe.

[0030] Preferably, in order to achieve rapid water supply and spraying, there are two water inlet pipes 7 , which are arranged side by side at intervals along the circumference of the transverse pipe 6 .

[0031] During actual use, the external coolant enters the spray pipe 4 through the water inlet pipe 7 , then quickly flows into the horizontal pipe 6 and the vertical pipe 5 , and is sprayed upward through the spray port 12 .

[0032] Furthermore, to adapt to the undulating surface of the bottom wall of the lower mold 1, the spray pipe 4 also includes a branch pipe 8 arranged above the longitudinal pipe 5 and extending laterally. An intermediate pipe 9 is connected between the branch pipe 8 and the longitudinal pipe 5. There are multiple intermediate pipes 9, which are connected to each longitudinal pipe 5 in a one-to-one correspondence. The spray port 12 is arranged on the upper side wall of the branch pipe 8. The structure of the branch pipe 8 is adapted to the undulating surface of the bottom wall of the lower mold 2. In other embodiments, the branch pipe can also be designed with other special structures such as curved pipes, broken pipes, etc. to arbitrarily change with the undulating surface of the bottom wall of the lower mold.

[0033] By providing the branch pipe 8 , all-round spraying of the bottom wall of the lower mold 1 can be achieved, and more than two rows of spray ports 12 can be provided on the branch pipe 8 to adapt to different orientations of the bottom wall curved surface.

[0034] Through the additional design of the spray pipe 4 and the spray port 12, after the upper mold 2 and the lower mold 1 are closed for molding, the coolant enters the cooling chamber to quickly cool the lower mold 1. At the same time, the spray pipe 4 is assisted to open and quickly spray the coolant on the bottom wall of the lower mold 1 to quickly cool the wall of the lower mold 1. Therefore, the lower mold 1 is quickly cooled by the synchronous action of the coolant in the cooling chamber and the coolant sprayed from the spray pipe, thereby achieving rapid demoulding and ensuring the molding quality and molding efficiency of the product after demoulding.

[0035] Finally, it should be noted that the above embodiments are only used to illustrate and not to limit the technical solutions of the present invention. Any equivalent replacement of the present invention and any modification or partial replacement that does not depart from the spirit and scope of the present invention should be included in the scope of protection of the claims of the present invention.

Claims

1. A mold for EPS foam products, comprising an upper mold and a lower mold that can be clamped together, the lower mold having a molding cavity and a cooling cavity, and a plurality of drainage holes connected to the cooling cavity arranged on the bottom wall of the lower mold, characterized in that: A spray pipe is also provided at the bottom of the lower mold. A plurality of spray ports are arranged on the spray pipe. The spray ports extend toward the lower mold wall. The spray pipe is externally connected to a water inlet pipe. Each spray port sprays coolant toward the lower mold wall to quickly cool the bottom wall of the lower mold.

2. The EPS foam product mold according to claim 1, characterized in that: The spray pipe has more than two longitudinal pipes, each longitudinal pipe is arranged parallel to each other and spaced apart, one end of each longitudinal pipe is connected to a transverse pipe, and the side wall of the transverse pipe is connected to the water inlet pipe.

3. The EPS foam product mold according to claim 2, characterized in that: There are more than two water inlet pipes, which are arranged side by side at intervals along the circumference of the horizontal pipe.

4. The EPS foam product mold according to claim 2, characterized in that: The bottom wall of the lower mold has a laterally extending concave portion, and the spray pipe also includes a branch pipe arranged above the longitudinal pipe and extending laterally. An intermediate pipe is connected between the branch pipe and the longitudinal pipe. There are multiple intermediate pipes, which are connected to each longitudinal pipe one by one. The spray port is arranged on the upper part of the side wall of the branch pipe.

5. The EPS foam product mold according to any one of claims 2 to 4, characterized in that: The bottom of the lower mold is connected with a mold clamping seat, the cross-sectional size of the mold clamping seat is consistent with the cross-sectional size of the bottom of the lower mold, and the spray pipe is connected to the mold clamping seat.

6. The EPS foam product mold according to claim 5, characterized in that: A connecting piece is fixed on one side wall of the clamping base, and the longitudinal pipe is fixed on the connecting piece. A mounting hole is arranged on the other side wall of the clamping base, and the water inlet pipe is fixed in the mounting hole.

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