CN216506505U - Needle valve type nozzle structure - Google Patents
Needle valve type nozzle structure Download PDFInfo
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- CN216506505U CN216506505U CN202123110167.8U CN202123110167U CN216506505U CN 216506505 U CN216506505 U CN 216506505U CN 202123110167 U CN202123110167 U CN 202123110167U CN 216506505 U CN216506505 U CN 216506505U
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- needle valve
- nozzle
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- valve assembly
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Abstract
The utility model discloses a needle valve type nozzle structure, which comprises a die cavity plate, a hot runner plate, a back plate, a cold die, a needle valve assembly, a driving assembly and a heat insulation sleeve, wherein the hot runner plate is arranged on the die cavity plate; the cold die is arranged in the die cavity plate, the driving assembly is arranged in the back plate, and the needle valve assembly is arranged in the hot runner plate; the cold die is provided with a feeding cavity and a discharging cavity, and the feeding cavity is communicated with the discharging cavity; the needle valve assembly comprises a nozzle and a nozzle seat, the nozzle seat is arranged in the hot runner plate, the nozzle is arranged in the nozzle seat, the end part of the nozzle seat and the end of the nozzle close to the cold die are both positioned in the discharge cavity, and a gap is formed between the end part of the nozzle seat and the end of the nozzle close to the cold die and the discharge cavity; the heat insulation sleeve is arranged in the gap and used for isolating heat transfer between the needle valve assembly and the cold die; this application aims at providing a needle valve formula nozzle structure, sets up the heat insulating sleeve and guarantees the thermal-insulated effect and the sealed effect between needle valve subassembly and the cold mould, improves the shaping and the drawing of patterns effect of body.
Description
Technical Field
The utility model relates to the technical field of thermoplastic processing, in particular to a needle valve type injection nozzle structure.
Background
The hot runner mold is a plastic injection molding mold which is commonly used at present, and comprises an open type hot runner system and a needle valve type hot runner system. The needle valve type hot runner system has the advantages of good color changing performance, suitability for most plastics, good flowing performance, extremely fine sprue marks and the like.
In the existing needle valve type hot runner, a needle valve component needs to be heated to a certain temperature to prevent materials from being condensed, so that a nozzle used for discharging materials is also provided with temperature, but the nozzle needs to be in close contact with a cold mold, and the structure of the cold mold is easily damaged by the temperature of the nozzle, so that the cold mold and the heat of the nozzle need to be separated to play a role in protecting the cold mold. Meanwhile, the contact part of the injection nozzle and the cold die also needs to maintain good sealing effect.
SUMMERY OF THE UTILITY MODEL
The utility model aims to provide a needle valve type nozzle structure, which is provided with a heat insulation sleeve to ensure the heat insulation effect and the sealing effect between a needle valve assembly and a cold die and improve the forming and demoulding effects of a blank body.
In order to achieve the purpose, the utility model adopts the following technical scheme: a needle valve type nozzle structure comprises a mold cavity plate, a hot runner plate, a back plate, a cold mold, a needle valve assembly, a driving assembly and a heat insulation sleeve;
the cold die is arranged in the die cavity plate, the driving assembly is arranged in the back plate, the needle valve assembly is arranged in the hot runner plate, the driving end of the needle valve assembly is connected with the driving assembly, and the output end of the needle valve assembly is connected with the cold die;
the cold die is provided with a feeding cavity and a discharging cavity, and the feeding cavity is communicated with the discharging cavity;
the needle valve assembly comprises a nozzle and a nozzle seat, the nozzle seat is arranged in the hot runner plate, the nozzle is arranged in the nozzle seat, the end part of the nozzle seat and the end of the nozzle close to the cold die are both positioned in the discharging cavity, and a gap is formed between the end part of the nozzle seat and the end of the nozzle close to the cold die and the discharging cavity;
the heat insulation sleeve is arranged in the gap and used for isolating the needle valve assembly from heat transfer of the cold die.
Preferably, the heat insulation sleeve comprises a conical part and an annular part, one end of the conical part, which is close to the discharging cavity, is smaller than one end of the conical part, which is close to the feeding cavity, and the annular part is connected with one end of the conical part, which is close to the feeding cavity.
Preferably, the thickness of the end of the conical portion adjacent to the feed cavity is less than the thickness of the end of the conical portion adjacent to the feed cavity.
Preferably, the heat insulating sleeve is made of a polyimide material.
Preferably, one end of the discharging cavity close to the feeding cavity is smaller than one end far away from the feeding cavity.
Preferably, the needle valve assembly further comprises a bushing and a needle valve, the bushing is arranged in the hot runner plate, one end of the bushing is connected with the sprue seat, the other end of the bushing is connected with the driving assembly, and the needle valve is arranged inside the sprue seat, the sprue nozzle and the bushing in a penetrating manner; the bush with between the needle valve the sprue seat with between the needle valve and the nozzle with the cooperation forms the runner of moulding plastics between the needle valve.
Preferably, when the needle valve is extruded to the limit position, the end part of the needle valve is flush with one end, close to the feeding cavity, of the discharging cavity.
Preferably, still including preventing changeing the flange, prevent changeing the flange setting and be in needle valve component's periphery, prevent changeing the tip and be connected with the installation cavity of flange, prevent changeing the flange and be used for preventing needle valve component takes place axial deflection.
The technical scheme of the utility model has the beneficial effects that: set up the radiation shield between cold mould and needle valve assembly and insulate against heat, prevent that needle valve assembly's heat transfer from influencing the cold mould, operations such as the cooling of cold mould and drawing of patterns, simultaneously, the radiation shield is filled in the clearance, can play sealed effect, guarantees the stability of the effect of extruding of material.
This application is through setting up the radiation shield, guarantees the thermal-insulated effect and the sealed effect between needle valve subassembly and the cold mould, improves the shaping and the drawing of patterns effect of body.
Drawings
FIG. 1 is a schematic block diagram of one embodiment of the present invention;
FIG. 2 is a schematic diagram of an embodiment of an insulating sleeve according to the present invention;
FIG. 3 is an enlarged partial schematic view at A of FIG. 1;
FIG. 4 is a schematic structural view of one embodiment of the present invention with the cavity plate, the hot runner plate and the back plate removed.
Wherein: the injection molding machine comprises a mold cavity plate 1, a hot runner plate 2, a back plate 3, a cold mold 4, a feeding cavity 41, a discharging cavity 42, a needle valve assembly 5, a nozzle 51, a nozzle seat 52, a lining 53, a needle valve 54, a driving assembly 6, a heat insulation sleeve 7, a conical part 71, an annular part 72 and an anti-rotation flange 8.
Detailed Description
The technical scheme of the utility model is further explained by the specific implementation mode in combination with the attached drawings.
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the accompanying drawings are illustrative only for the purpose of explaining the present invention, and are not to be construed as limiting the present invention.
In the description of the present invention, it is to be understood that the terms "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like, indicate orientations or positional relationships based on those shown in the drawings, and are used merely for convenience of description and for simplicity of description, and do not indicate or imply that the referenced devices or elements must have a particular orientation, be constructed in a particular orientation, and be operated, and thus, are not to be construed as limiting the present invention. Furthermore, features defined as "first" and "second" may explicitly or implicitly include one or more of the features for distinguishing between descriptive features, non-sequential, non-trivial and non-trivial.
In the description of the present invention, "a plurality" means two or more unless otherwise specified.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
Referring to fig. 1 to 4, a needle valve type nozzle structure includes a cavity plate 1, a hot runner plate 2, a back plate 3, a cold mold 4, a needle valve assembly 5, a driving assembly 6, and a heat insulation sleeve 7;
the cold die 4 is arranged in the die cavity plate 1, the driving assembly 6 is arranged in the back plate 3, the needle valve assembly 5 is arranged in the hot runner plate 2, the driving end of the needle valve assembly 5 is connected with the driving assembly 6, and the output end of the needle valve assembly 5 is connected with the cold die 4;
the cold die 4 is provided with a feeding cavity 41 and a discharging cavity 42, and the feeding cavity 41 is communicated with the discharging cavity 42;
the needle valve assembly 5 comprises a nozzle 51 and a nozzle seat 52, the nozzle seat 52 is arranged in the hot runner plate 2, the nozzle 51 is arranged in the nozzle seat 52, the end part of the nozzle seat 52 and the end of the nozzle 51 close to the cold die 4 are both positioned in the discharging cavity 42, and a gap is formed between the end part of the nozzle seat 52 and the end of the nozzle 51 close to the cold die 4 and the discharging cavity 42;
the heat insulation sleeve 7 is arranged in the gap, and the heat insulation sleeve 7 is used for isolating the heat transfer between the needle valve assembly 5 and the cold die 4.
Adopt this kind of structure, set up heat insulating sleeve 7 between chill 4 and needle valve assembly 5 and insulate against heat, prevent that the heat transfer of needle valve assembly 5 from reaching chill 4, influence the operations such as cooling and the drawing of patterns of chill 4, simultaneously, heat insulating sleeve 7 fills in the clearance, can play sealed effect, guarantees the stability of the effect of extruding of material.
This application is through setting up radiation shield 7, guarantees the thermal-insulated effect and the sealed effect between needle valve assembly 5 and the cold mould 4, improves the shaping and the drawing of patterns effect of body.
Preferably, the heat insulation sleeve 7 comprises a tapered portion 71 and an annular portion 72, an end of the tapered portion 71 close to the discharging cavity 42 is smaller than an end close to the feeding cavity 41, and the annular portion 72 is connected with an end of the tapered portion 71 close to the feeding cavity 41.
By adopting the structure, the conical part 71 and the annular part 72 are matched and can be coated on the periphery of the end part of the injection nozzle 51 to isolate the injection nozzle 51 from the cold die 4, so that the injection nozzle 51 is prevented from contacting with the cold die 4 to generate heat transfer, and the molding and demolding of a blank body are prevented from being influenced.
In the present application, the thickness of the end of the conical portion 71 near the feed cavity 41 is smaller than the thickness of the end of the conical portion 71 near the feed cavity 41.
The thickness of the larger end of the conical part 71 is larger than that of the smaller end, and the structure can ensure that the conical part 71 can be completely filled in the gap, so that the sealing effect is ensured.
In particular, the insulating sleeve 7 is made of a polyimide material.
The heat insulation sleeve 7 is made of polyimide materials, has a high-temperature resistant effect, can be used at a temperature of-200-300 ℃ for a long time, and has no obvious melting point.
Preferably, the end of the discharging cavity 42 close to the feeding cavity 41 is smaller than the end far away from the feeding cavity 41.
Meanwhile, the needle valve assembly 5 further comprises a lining 53 and a needle valve 54, the lining 53 is arranged in the hot runner plate 2, one end of the lining 53 is connected with the nozzle seat 52, the other end of the lining 53 is connected with the driving assembly 6, and the needle valve 54 is arranged inside the nozzle seat 52, the nozzle 51 and the lining 53 in a penetrating manner; the bush 53 with between the needle valve 54, the sprue seat 52 with between the needle valve 54 and the nozzle 51 with the cooperation between the needle valve 54 forms the runner of moulding plastics.
With this structure, the needle valve 54 is pushed by the driving assembly 6 to reciprocate in the nozzle 51 in the axial direction, so that the material in the injection runner is pushed into the discharge cavity 42, and injection molding is completed.
Specifically, when the needle valve 54 is extruded to the limit position, the end of the needle valve 54 is flush with the end of the discharge chamber 42 close to the feed chamber 41.
With this configuration, the shape of the green body within the discharge chamber 42 decreases as the internal diameter of the discharge chamber 42 decreases, which facilitates demolding. When the needle valve 54 is extruded to the limit position, the end part of the needle valve 54 is flush with the smaller end of the discharge cavity 42, so that leftover materials at the end part of the blank body can be reduced when the blank body is formed, the blank body is prevented from forming redundant bulges at the smaller end of the discharge cavity 42, and the subsequent treatment process of the blank body is reduced.
Preferably, still including preventing changeing flange 8, prevent changeing flange 8 and set up needle valve component 5's periphery, prevent changeing flange 8's tip and installation cavity and be connected, prevent changeing flange 8 and be used for preventing needle valve component 5 takes place axial deflection.
With this structure, the rotation preventing flange 8 can prevent the bush of the needle valve assembly 5 from axially deflecting, and can stabilize the bush of the needle valve assembly 5 when extruding a material.
In the description herein, references to the description of the terms "embodiment," "example," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the utility model. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
The technical principle of the present invention is described above in connection with specific embodiments. The description is made for the purpose of illustrating the principles of the utility model and should not be construed in any way as limiting the scope of the utility model. Based on the explanations herein, those skilled in the art will be able to conceive of other embodiments of the present invention without inventive effort, which would fall within the scope of the present invention.
Claims (8)
1. A needle valve type nozzle structure is characterized by comprising a mold cavity plate, a hot runner plate, a back plate, a cold mold, a needle valve assembly, a driving assembly and a heat insulation sleeve;
the cold die is arranged in the die cavity plate, the driving assembly is arranged in the back plate, the needle valve assembly is arranged in the hot runner plate, the driving end of the needle valve assembly is connected with the driving assembly, and the output end of the needle valve assembly is connected with the cold die;
the cold die is provided with a feeding cavity and a discharging cavity, and the feeding cavity is communicated with the discharging cavity;
the needle valve assembly comprises a nozzle and a nozzle seat, the nozzle seat is arranged in the hot runner plate, the nozzle is arranged in the nozzle seat, the end part of the nozzle seat and the end of the nozzle close to the cold die are both positioned in the discharging cavity, and a gap is formed between the end part of the nozzle seat and the end of the nozzle close to the cold die and the discharging cavity;
the heat insulation sleeve is arranged in the gap and used for isolating the needle valve assembly from heat transfer of the cold die.
2. The needle valve nozzle of claim 1, wherein said sleeve comprises a conical portion and an annular portion, said conical portion being smaller at an end adjacent to said outlet chamber than at an end adjacent to said inlet chamber, said annular portion being connected to said conical portion at an end adjacent to said inlet chamber.
3. A needle valve nozzle arrangement as claimed in claim 2, wherein the end of the conical portion adjacent the inlet chamber has a thickness less than the thickness of the end of the conical portion adjacent the inlet chamber.
4. A needle valve nozzle arrangement as claimed in claim 1, wherein said sleeve is made of a polyimide material.
5. A needle valve nozzle arrangement as claimed in claim 1, wherein the outlet chamber is smaller at an end thereof adjacent to the inlet chamber than at an end thereof remote from the inlet chamber.
6. The needle valve nozzle structure of claim 5, wherein the needle valve assembly further comprises a bushing and a needle valve, the bushing is disposed in the hot runner plate, one end of the bushing is connected to the nozzle base, the other end of the bushing is connected to the driving assembly, and the needle valve is inserted into the nozzle base, the nozzle and the bushing; the bush with between the needle valve the sprue seat with between the needle valve and the sprue with the cooperation forms the runner of moulding plastics between the needle valve.
7. The needle valve nozzle structure as claimed in claim 6, wherein an end of the needle valve is flush with an end of the outlet chamber close to the inlet chamber when the needle valve is pushed out to the limit position.
8. The needle valve nozzle structure of claim 1, further comprising an anti-rotation flange disposed at a periphery of the needle valve assembly, wherein an end of the anti-rotation flange is connected to the mounting cavity, and the anti-rotation flange is used for preventing the needle valve assembly from axially deflecting.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202123110167.8U CN216506505U (en) | 2021-12-10 | 2021-12-10 | Needle valve type nozzle structure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202123110167.8U CN216506505U (en) | 2021-12-10 | 2021-12-10 | Needle valve type nozzle structure |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN216506505U true CN216506505U (en) | 2022-05-13 |
Family
ID=81468189
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202123110167.8U Active CN216506505U (en) | 2021-12-10 | 2021-12-10 | Needle valve type nozzle structure |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN216506505U (en) |
-
2021
- 2021-12-10 CN CN202123110167.8U patent/CN216506505U/en active Active
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