Anti-hanging structure of extrusion opening of injection mold

Abstract

The utility model discloses an anti-hanging structure of an extrusion port of an injection mold, which relates to the field of plastic forming devices, and is characterized in that a first wedge-shaped surface is arranged at the outlet end of an extrusion runner, so that the port of the extrusion runner is wider, and the accumulation of plastic in a certain molten state can be formed at the extrusion port; therefore, the temperature of the extrusion opening position is ensured, and the material hanging condition can be effectively reduced; and meanwhile, even if the material hanging condition occurs, the plastic particles or blocks can fall into the molten plastic on the first wedge-shaped surface firstly, cannot directly fall into the molten plastic in the extrusion runner, and are converged into the extrusion runner until being molten, so that the plastic particles or blocks cannot be formed, and the extruded plastic is more uniform.

Description

Technical Field

[0001] The utility model belongs to the field of plastic molding devices, and in particular relates to a material hanging prevention structure of an extrusion outlet of an injection mold. Background Art

[0002] Plastic products are made from a mixture of synthetic resins and various additives using methods such as injection, extrusion, pressing, and casting.

[0003] Extrusion molding is a common method of forming plastic products. High-temperature molten plastic and other materials are injected into the extrusion mold through an extruder, and then the plastic is extruded into the form of sheets or cylinders through the extrusion mold. After extrusion, the molten plastic leaves the high-temperature environment and quickly condenses and forms in the air, thus obtaining a plastic product.

[0004] The extrusion flow channels of existing plastic extrusion molding dies are almost all linear flow channels.

[0005] The linear flow channel has the following obvious defects:

[0006] (1) After the molten plastic is extruded, the linear type easily forms solidified particles or blocks when the end face of the extrusion flow channel is cooled, which is the hanging material phenomenon.

[0007] (2) The farther the extrusion flow channel is from the central buffer cavity of the extrusion die, the lower the temperature of the extrusion die, resulting in a lower temperature of the molten plastic. The plastic particles or blocks condensed at the extrusion outlet are likely to fall into the extrusion flow channel, and the temperature of the molten plastic at the extrusion outlet is not enough to melt the fallen plastic particles or blocks immediately. These plastic particles or blocks will be entrained in the molten plastic. After cooling, the molten plastic entrained with plastic particles or blocks will have obvious defects such as uneven texture and particles or blocks. Utility Model Content

[0008] In order to solve the above problems existing in the prior art, the purpose of the present invention is to provide an anti-hanging material structure for the extrusion port of an injection mold.

[0009] The technical solution adopted by this utility model is:

[0010] An anti-hanging structure for an injection mold extrusion outlet includes a first mold body and a second mold body, with an extrusion flow channel opened between the first mold body and the second mold body; a first wedge surface is provided at the outlet end of the extrusion flow channel, and the first wedge surface causes the passage diameter of the extrusion flow channel to shrink inward.

[0011] Optionally, a second wedge-shaped surface is further provided at one end of the first wedge-shaped surface away from the end surface of the extrusion flow channel.

[0012] Optionally, a feed channel and a first buffer cavity are further provided between the first die body and the second die body, and the feed channel and the extrusion channel are respectively provided at two ends of the first buffer cavity.

[0013] Optionally, a second buffer cavity is provided in a portion of the extrusion channel between the second wedge-shaped surface and the first buffer cavity.

[0014] Optionally, a portion of the extrusion channel located between the second buffer cavity and the first buffer cavity is provided with a buffer corner.

[0015] Optionally, the cross section of the first buffer cavity is gourd-shaped.

[0016] The beneficial effects of the utility model are:

[0017] The utility model provides an anti-hanging structure for the extrusion port of an injection mold, comprising a first mold body and a second mold body, wherein an extrusion channel is provided between the first mold body and the second mold body; a first wedge surface is provided at the outlet end of the extrusion channel, and the first wedge surface causes the diameter of the extrusion channel to shrink inward. When the width of the extrusion channel is the same, by providing the first wedge surface at the outlet end of the extrusion channel, the width of the port of the extrusion channel is made wider, so that a certain amount of molten plastic can be accumulated at the extrusion port, thereby ensuring the temperature at the extrusion port position and effectively reducing the occurrence of hanging; at the same time, even if hanging occurs, plastic particles or blocks will first fall into the molten plastic on the first wedge surface, and will not directly fall into the molten plastic of the extrusion channel, and will not return to the extrusion channel until they are melted, so that no plastic particles or blocks will be formed, making the extruded plastic more uniform. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a cross-sectional schematic diagram of the present utility model.

[0019] Figure 2 It is an enlarged schematic diagram of the extrusion outlet end of the extrusion channel.

[0020] Figure 3 It is an enlarged schematic diagram of the section between the second wedge-shaped surface of the extrusion channel and the first buffer cavity.

[0021] In the figure: 1-first mold body, 2-second mold body, 3-feed channel, 4-first buffer cavity, 5-extrusion channel, 51-end face, 52-first wedge surface, 53-second wedge surface, 54-second buffer cavity, 55-buffer corner. DETAILED DESCRIPTION

[0022] like Figures 1 to 3The invention discloses an anti-hanging structure for an injection mold extrusion port, comprising a first mold body 1 and a second mold body 2, with an extrusion channel 5 defined between the first mold body 1 and the second mold body 2. The extrusion channel 5 is provided with a first wedge-shaped surface 52 at the outlet end thereof, which causes the diameter of the extrusion channel 5 to contract inwardly. When the width of the extrusion channel 5 remains the same, the provision of the first wedge-shaped surface 52 at the outlet end of the extrusion channel 5 increases the width of the extrusion channel 5, thereby allowing a certain amount of molten plastic to accumulate at the extrusion port, thereby maintaining the temperature at the extrusion port and effectively reducing the occurrence of hanging. Furthermore, even if hanging occurs, plastic particles or lumps will first fall into the molten plastic on the first wedge-shaped surface 52, rather than directly into the molten plastic in the extrusion channel 5. Plastic particles or lumps will not form until they are melted and then flow back into the extrusion channel 5, thereby preventing the formation of plastic particles or lumps and making the extruded plastic more uniform.

[0023] Specifically, such as Figure 1 As shown, the first mold body 1 and the second mold body 2 are mutually fitting molds, the gap between the bottom side walls of the first mold body 1 and the second mold body 2 forms a feed channel 3, and the gap between the top side walls of the first mold body 1 and the second mold body 2 forms an extrusion channel 5.

[0024] In this embodiment, a first wedge-shaped surface 52 is formed at the same position on the top of the first mold body 1 and the second mold body 2 .

[0025] In this embodiment, if Figure 3 As shown, a second wedge surface 53 is further provided at one end of the first wedge surface 52 away from the end surface 51 of the extrusion runner 5. When the diameter of the extrusion runner 5 is the same, the second wedge surface 53 makes the space between the first wedge surface 52 and the second buffer cavity 54 larger, which can accommodate more molten plastic, and thus can maintain the temperature around the first wedge surface 52 to a greater extent, further preventing the occurrence of material hanging on the end surface 51.

[0026] In this embodiment, a first buffer chamber 4 is provided between the feed channel 3 and the extrusion channel 5. The first buffer chamber 4 is used to store molten plastic, thereby increasing the overall temperature of the first mold body 1 and the second mold body 2. The cross section of the first buffer chamber 4 is gourd-shaped.

[0027] In this embodiment, if Figure 3 As shown, a second buffer cavity 54 is provided in the portion of the extrusion channel 5 between the second wedge-shaped surface 53 and the first buffer cavity 4. The second buffer cavity 54 is also used to store molten plastic, so that the temperature of the entire extrusion channel 5 does not decrease linearly like the temperature of a linear extrusion channel, further ensuring the temperature inside the entire extrusion channel 5.

[0028] In this embodiment, Figure 3As shown, the portion of the extrusion channel 5 between the second buffer chamber 54 and the first buffer chamber 4 is provided with a buffer corner 55. The buffer corner 55 is located at the outlet of the first buffer chamber 4 to prevent the plastic ejected from the first buffer chamber 4 from experiencing excessive pressure and excessive extrusion speed. The buffer corner 55 causes the molten plastic in the first buffer chamber 4 to change direction upon entering the extrusion channel 5.

[0029] In this utility model, unless otherwise specified or limited, the terms "installed," "connected," "connect," "fixed," etc. should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integration; mechanical connection, electrical connection; direct connection, indirect connection through an intermediate medium, internal communication between two components, or interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on specific circumstances.

[0030] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art can combine and combine different embodiments or examples described in this specification and features of different embodiments or examples without contradiction.

[0031] Although the embodiments of the present invention have been shown and described above, it can be understood that the above embodiments are illustrative and cannot be understood as limitations on the present invention. Ordinary technicians in this field can change, modify, replace and modify the above embodiments within the scope of the present invention.

Claims

1. An anti-hanging structure for an injection mold extrusion port, characterized in that: It comprises a first die body (1) and a second die body (2), wherein an extrusion flow channel (5) is provided between the first die body (1) and the second die body (2); The outlet end of the extrusion flow channel (5) is provided with a first wedge-shaped surface (52), and the first wedge-shaped surface (52) causes the diameter of the extrusion flow channel (5) to contract inward.

2. The anti-hanging structure of the injection mold extrusion port according to claim 1, characterized in that: A second wedge-shaped surface (53) is further provided at one end of the first wedge-shaped surface (52) away from the end surface (51) of the extrusion flow channel (5).

3. The anti-hanging structure of the injection mold extrusion port according to claim 2, characterized in that: A feed channel (3) and a first buffer cavity (4) are also provided between the first die body (1) and the second die body (2), and the feed channel (3) and the extrusion channel (5) are respectively provided at two ends of the first buffer cavity (4).

4. The anti-hanging structure of the injection mold extrusion port according to claim 3, characterized in that: A second buffer cavity (54) is provided in the portion of the extrusion flow channel (5) located between the second wedge-shaped surface (53) and the first buffer cavity (4).

5. The anti-hanging structure of the injection mold extrusion port according to claim 4, characterized in that: The portion of the extrusion flow channel (5) located between the second buffer cavity (54) and the first buffer cavity (4) is provided with a buffer corner (55).

6. The anti-hanging structure of the injection mold extrusion port according to claim 5, characterized in that: The cross section of the first buffer chamber (4) is gourd-shaped.

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