CN216708207U - Hot runner structure - Google Patents
Hot runner structure Download PDFInfo
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- CN216708207U CN216708207U CN202123039827.8U CN202123039827U CN216708207U CN 216708207 U CN216708207 U CN 216708207U CN 202123039827 U CN202123039827 U CN 202123039827U CN 216708207 U CN216708207 U CN 216708207U
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- cavity
- sealing ring
- hot nozzle
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Abstract
The utility model discloses a hot runner structure, and aims to provide a hot runner structure which is simple in structure, easy to disassemble and assemble and free of glue leakage. The mold comprises a mold, wherein a cavity and a mold cavity are arranged on the mold, a glue injection hole and a heating hot nozzle structure are arranged in the cavity, the cavity is communicated with the mold cavity through the glue injection hole, the heating hot nozzle structure comprises a hot nozzle matched with the glue injection hole, a hot nozzle sleeve is sleeved on the hot nozzle, a sealing ring is sleeved on the hot nozzle sleeve, the sealing ring is sealed between the hot nozzle sleeve and the inner wall of the cavity, and the thermal expansion coefficient of the sealing ring is greater than that of the hot nozzle sleeve and the inner wall of the cavity. The utility model is applied to the technical field of hot runners.
Description
Technical Field
The utility model relates to the technical field of hot runners, in particular to a hot runner structure.
Background
For a hot runner injection mold, in particular a multi-cavity molding hot runner injection mold, each cavity inevitably has at least one heating nozzle structure; the hot nozzle heats the plastic to melt at high temperature through the heating pipe, so that the plastic can be injected into the mold cavity to form a product, and the mold cavity needs to rapidly cool and form the product; the plastic in the space is melted at high temperature and subjected to high pressure for a long time, so that the matching between the hot nozzle sleeve of the nozzle structure and the mold cavity is required to be very tight for a long time, and the plastic can not leak glue into the space of the outer ring of the hot nozzle sleeve (a heating tube is arranged) under the conditions of high temperature and high pressure, so that the heating tube is damaged and cannot be normally produced.
For a long time, in order to ensure no glue leakage, the front end of the hot nozzle sleeve and the inner side of the outer ring and the glue injection hole of the die cavity are in zero-to-zero or interference fit to ensure no glue leakage; the design is relatively effective when the mold is newer and the assembly and disassembly times are less, but when the mold is used to a certain extent or after the mold is assembled and disassembled for many times at the position, because the hot nozzle sleeve and the mold cavity are both made of harder steel, abrasion or defect or fracture can be caused by hard collision, glue leakage can be caused after damage, and the conditions of abnormal production, shortened service life of the mold, difficult maintenance, high cost and the like are caused; especially for a bottle cap mould formed by multiple cavities, the pain point exists for a long time, and no good solution is provided. Therefore, there is a need to develop a hot runner structure with simple structure, easy assembly and disassembly, and no glue leakage.
SUMMERY OF THE UTILITY MODEL
The utility model aims to solve the technical problem of overcoming the defects of the prior art, provides a hot runner structure which is simple in structure, easy to disassemble and assemble and free of glue leakage, utilizes the principle of metal expansion with heat and contraction with cold differentiation, can avoid glue leakage, improves production efficiency and quality, prolongs the service life of a mould, reduces maintenance cost, and is particularly suitable for bottle caps and lifting handle moulds formed by multiple cavities.
The technical scheme adopted by the utility model is as follows: the utility model comprises a mould, wherein a cavity and a mould cavity are arranged on the mould, a glue injection hole and a heating hot nozzle structure are arranged in the cavity, the cavity is communicated with the mould cavity through the glue injection hole, the heating hot nozzle structure comprises a hot nozzle matched with the glue injection hole, a hot nozzle sleeve is sleeved on the hot nozzle sleeve, a sealing ring is sleeved on the hot nozzle sleeve, the sealing ring is sealed between the hot nozzle sleeve and the inner wall of the cavity, and the thermal expansion coefficient of the sealing ring is greater than that of the hot nozzle sleeve and the inner wall of the cavity.
Further, the material of sealing ring is copper, the material of hot nozzle cover and mould inner wall is steel.
Furthermore, the sealing ring is in clearance fit with the hot nozzle sleeve, and the sealing ring is in clearance fit with the cavity.
Further, the cross section of the sealing ring is one of square, round, T-shaped and U-shaped.
The utility model has the beneficial effects that:
compared with the defects of the prior art, the sealing ring has the advantages that the thermal expansion coefficient of the sealing ring is larger than that of the hot nozzle sleeve and the inner wall of the cavity, so that the sealing ring can be easily detached and is not easy to wear in a non-working state, and can form interference tight fit in a working state, so that a good sealing effect is achieved, and glue leakage is avoided; when the sealing ring is used for a certain period of life, the sealing ring can be easily replaced to further reduce the risk of glue leakage, so that the sealing ring has the advantages of simple structure, easiness in disassembly and assembly and no glue leakage.
Furthermore, the thermal expansion coefficient of copper is greater than that of steel, so that the sealing ring has a good sealing effect and cannot leak glue, and the hardness of the copper sealing ring is lower than that of the steel hot nozzle sleeve and that of the steel cavity inner wall, so that when the sealing ring is arranged between the hot nozzle sleeve and the cavity inner wall in a matched mode, the contact surface between the sealing ring and the hot nozzle sleeve and that of the cavity can be prevented from being damaged, and a good protection effect is achieved.
Further, the sealing ring with clearance fit between the hot nozzle sleeve and the sealing ring with clearance fit between the cavity makes the sealing ring can be easily disassembled and assembled at normal temperature.
Drawings
FIG. 1 is a cross-sectional view of the present invention;
fig. 2 is a schematic plan view of the seal ring.
The reference numbers are as follows:
1. a mold; 2. a chamber; 5. injecting glue holes; 6. a heating hot nozzle structure; 7. a hot nozzle; 8. a hot nozzle sleeve; 9. and (4) a sealing ring.
Detailed Description
As shown in fig. 1 to 2, in this embodiment, the present invention includes a mold 1, a cavity 2 and a mold cavity are disposed on the mold 1, a glue injection hole 5 and a heating hot nozzle structure 6 are disposed in the cavity 2, the cavity 2 is communicated with the mold cavity through the glue injection hole 5, the heating hot nozzle structure 6 includes a hot nozzle 7 matched with the glue injection hole 5, a hot nozzle sleeve 8 is sleeved on the hot nozzle 7, a sealing ring 9 is sleeved on the hot nozzle sleeve 8, the sealing ring 9 is sealed between the hot nozzle sleeve 8 and an inner wall of the cavity 2, and a thermal expansion coefficient of the sealing ring 9 is greater than thermal expansion coefficients of the hot nozzle sleeve 8 and the inner wall of the cavity 2, for example, the inner walls of the hot nozzle sleeve 8 and the cavity 2 are both made of steel, or the sealing ring 9 is made of copper or a material with a higher thermal expansion coefficient. The hot nozzle 7 is a needle valve type hot nozzle or a sharp nozzle type hot nozzle.
Compared with the defects of the prior art, in the utility model, the hot nozzle 7 injects glue towards the mold cavity through the glue injection hole 5, the sealing ring 9 is configured to prevent the leakage of the hot melt glue, and the sealing ring 9 can be easily assembled and disassembled at normal temperature; during high-temperature production, because the thermal expansion coefficient of the sealing ring 9 is greater than the thermal expansion coefficients of the hot nozzle sleeve 8 and the inner wall of the cavity 2, the principle of thermal expansion and cold contraction is utilized, so that the expansion of the sealing ring 9 is greater than the expansion of the hot nozzle sleeve 8 and the inner wall of the cavity 2, the sealing ring 9 can form interference tight fit between the hot nozzle sleeve 8 and the inner wall of the cavity 2, and a good sealing effect is achieved, therefore, the sealing ring 9 can be easily detached and not easily worn in a non-working state and can form interference tight fit in a working state through the arrangement that the thermal expansion coefficient of the sealing ring 9 is greater than the thermal expansion coefficients of the hot nozzle sleeve 8 and the inner wall of the cavity 2, and thus the sealing ring has a good sealing effect and can not leak glue; when the sealing ring 9 is used for a certain period of life, the sealing ring 9 can be easily replaced to further reduce the risk of glue leakage, so that the sealing ring has the advantages of simple structure, easiness in assembly and disassembly and no glue leakage.
In this embodiment, the material of the sealing ring 9 is copper, and the material of the hot plug sleeve 8 and the material of the inner wall of the cavity 2 are both steel. Because the thermal expansion coefficient of copper is greater than that of steel, the sealing ring 9 has a good sealing effect and can not leak glue, and the hardness of the copper sealing ring 9 is lower than that of the steel hot nozzle sleeve 8 and that of the steel inner wall of the cavity 2, so that when the sealing ring 9 is arranged between the hot nozzle sleeve 8 and the inner wall of the cavity 2 in a matched manner, the contact surface between the sealing ring 9 and the hot nozzle sleeve 8 and that of the cavity 2 can be prevented from being damaged, and a good protection effect is achieved.
In this embodiment, the sealing ring 9 is in clearance fit with the hot plug sleeve 8, and the sealing ring 9 is in clearance fit with the cavity 2. The sealing ring 9 and the hot nozzle sleeve 8 are in clearance fit, and the sealing ring 9 and the cavity 2 are in clearance fit, so that the sealing ring 9 can be easily disassembled and assembled at normal temperature.
In the present embodiment, the cross section of the sealing ring 9 is one of square, circular, T-shaped and U-shaped.
While the embodiments of the utility model have been described in terms of practical embodiments, they are not to be construed as limiting the utility model, and modifications of the embodiments and combinations with other embodiments will be apparent to those skilled in the art in light of the present disclosure.
Claims (4)
1. A hot runner structure, characterized in that: the mold comprises a mold (1), a cavity (2) and a mold cavity are arranged on the mold (1), a glue injection hole (5) and a heating hot nozzle structure (6) are arranged in the cavity (2), the cavity (2) is communicated with the mold cavity through the glue injection hole (5), the heating hot nozzle structure (6) comprises a hot nozzle (7) matched with the glue injection hole (5), a hot nozzle sleeve (8) is sleeved on the hot nozzle (7), a sealing ring (9) is sleeved on the hot nozzle sleeve (8), the sealing ring (9) is sealed between the hot nozzle sleeve (8) and the inner wall of the cavity (2), and the thermal expansion coefficient of the sealing ring (9) is greater than that of the hot nozzle sleeve (8) and that of the inner wall of the cavity (2).
2. The hot-runner structure of claim 1, wherein: the material of the sealing ring (9) is copper, and the material of the hot nozzle sleeve (8) and the material of the inner wall of the die (1) are both steel.
3. The hot-runner structure of claim 1, wherein: the sealing ring (9) is in clearance fit with the hot nozzle sleeve (8), and the sealing ring (9) is in clearance fit with the cavity (2).
4. The hot-runner structure as claimed in any one of claims 1 to 3, wherein: the cross section of the sealing ring (9) is one of square, round, T-shaped and U-shaped.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202123039827.8U CN216708207U (en) | 2021-12-02 | 2021-12-02 | Hot runner structure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202123039827.8U CN216708207U (en) | 2021-12-02 | 2021-12-02 | Hot runner structure |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN216708207U true CN216708207U (en) | 2022-06-10 |
Family
ID=81882400
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202123039827.8U Active CN216708207U (en) | 2021-12-02 | 2021-12-02 | Hot runner structure |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN216708207U (en) |
-
2021
- 2021-12-02 CN CN202123039827.8U patent/CN216708207U/en active Active
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