CN110722746A - Hot nozzle assembly and hot runner system - Google Patents

Hot nozzle assembly and hot runner system Download PDF

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Publication number
CN110722746A
CN110722746A CN201911034621.0A CN201911034621A CN110722746A CN 110722746 A CN110722746 A CN 110722746A CN 201911034621 A CN201911034621 A CN 201911034621A CN 110722746 A CN110722746 A CN 110722746A
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CN
China
Prior art keywords
tip
hot
hot nozzle
flow passage
nozzle
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN201911034621.0A
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Chinese (zh)
Inventor
李象烈
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Yudo Suzhou Hot Runner Systems Co Ltd
Original Assignee
Yudo Suzhou Hot Runner Systems Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Yudo Suzhou Hot Runner Systems Co Ltd filed Critical Yudo Suzhou Hot Runner Systems Co Ltd
Priority to CN201911034621.0A priority Critical patent/CN110722746A/en
Publication of CN110722746A publication Critical patent/CN110722746A/en
Pending legal-status Critical Current

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
    • B29C45/17—Component parts, details or accessories; Auxiliary operations
    • B29C45/26—Moulds
    • B29C45/27—Sprue channels ; Runner channels or runner nozzles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
    • B29C45/17—Component parts, details or accessories; Auxiliary operations
    • B29C45/26—Moulds
    • B29C45/27—Sprue channels ; Runner channels or runner nozzles
    • B29C45/28—Closure devices therefor
    • B29C45/2806—Closure devices therefor consisting of needle valve systems

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  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Mechanical Engineering (AREA)
  • Moulds For Moulding Plastics Or The Like (AREA)

Abstract

The invention discloses a hot nozzle assembly and a hot runner system, wherein the hot nozzle assembly comprises a hot nozzle extending along a longitudinal axis, a valve pin and a nozzle tip device partially positioned at the inner side of the hot nozzle, the hot nozzle defines a first flow passage, the nozzle tip device defines a second flow passage communicated with the first flow passage and a pouring gate communicated with the second flow passage, the valve pin is movably arranged in the first flow passage and the second flow passage along the longitudinal axis to open or close the pouring gate, the nozzle tip device comprises an upper nozzle tip contacted with the hot nozzle and a lower nozzle tip defining the pouring gate, the hardness of the lower nozzle tip is greater than that of the upper nozzle tip, and the thermal conductivity of the lower nozzle tip is less than that of the upper nozzle tip. The invention ensures that the nozzle tip device not only ensures the heat conductivity, but also is more wear-resistant and not easy to deform.

Description

Hot nozzle assembly and hot runner system
Technical Field
The invention relates to the field of hot runner molds, in particular to a hot nozzle assembly and a hot runner system.
Background
At present, the injection mold generally adopted in the injection molding industry is a hot runner injection mold, and compared with a common mold, the quality of a plastic product injected by a hot runner system is higher, and the hot runner system has the advantages of saving raw materials, improving the production efficiency, improving the automation degree and the like.
The hot nozzle assembly generally includes a hot nozzle, a nozzle tip disposed in the hot nozzle, and a valve needle, where the valve needle is driven to reciprocate in a flow channel formed by the hot nozzle and the nozzle tip, so as to open or close a gate formed on the nozzle tip, perform glue injection or stop glue injection, and impact the nozzle tip during movement of the valve needle, and the nozzle tip generally adopts a material with good thermal conductivity, so as to keep a molten material at a certain temperature, thereby ensuring fluidity of the molten material. But because of the material with good heat conductivity, the hardness is lower, the wear resistance is not good, and the deformation is easy.
Disclosure of Invention
The invention aims to provide a hot nozzle assembly and a hot runner system, so that a nozzle tip device not only ensures the heat conductivity, but also is more wear-resistant and is not easy to deform.
In order to achieve one of the above objects, an embodiment of the present invention provides a hot nozzle assembly including a hot nozzle extending along a longitudinal axis, a valve pin, and a tip device partially located inside the hot nozzle, the hot nozzle defining a first flow passage, the tip device defining a second flow passage communicating with the first flow passage and a gate communicating with the second flow passage, the valve pin being movably disposed in the first flow passage and the second flow passage along the longitudinal axis to open or close the gate, wherein,
the tip device includes an upper tip in contact with the hot nozzle and a lower tip defining the gate, the lower tip having a hardness greater than a hardness of the upper tip and a thermal conductivity less than a thermal conductivity of the upper tip.
As a further improvement of an embodiment of the present invention, the tip device further includes an outer tip, a part of the outer tip covers a part of an outer periphery of the upper tip, and a part of the outer tip covers at least a part of an outer periphery of the lower tip, and a thermal conductivity of the outer tip is greater than a thermal conductivity of the lower tip.
As a further improvement of an embodiment of the present invention, a part of the outer tip is located between the hot nozzle and the upper tip, and a part of the outer tip is located between the hot nozzle and the lower tip in the circumferential direction.
As a further development of an embodiment of the invention, in the direction of extension of the longitudinal axis, the upper tip abuts the hot nozzle, the lower tip abuts the upper tip, and the outer tip abuts both the upper tip and the lower tip, the outer tip being stationary relative to the hot nozzle.
As a further improvement of an embodiment of the present invention, the hot nozzle assembly further includes a pressing cap fixedly connected to an inner side of the hot nozzle by a screw thread, and the pressing cap abuts against the outer nozzle tip in an extending direction of the longitudinal axis to fix the nozzle tip device to the inner side of the hot nozzle.
As a further improvement of an embodiment of the present invention, the distal end of the lower nib is protruded from the distal end of the outer nib.
In a further improvement of an embodiment of the present invention, the lower tip is made of tungsten steel.
As a further improvement of an embodiment of the present invention, the hot nozzle assembly includes an insulating sleeve covering a distal outer periphery of the lower tip and a distal outer periphery of the outer tip, and the thermal conductivity of the lower tip and the thermal conductivity of the outer tip are each greater than the thermal conductivity of the insulating sleeve.
In order to achieve one of the above objects, an embodiment of the present invention further provides a hot runner system including a hot nozzle assembly for pouring plastic in a molten state, the hot nozzle assembly including a hot nozzle extending along a longitudinal axis, a valve pin, and a tip device partially located inside the hot nozzle, the hot runner system further including a driving unit for driving the valve pin to reciprocate along the longitudinal axis, the hot nozzle defining a first flow passage, the tip device defining a second flow passage communicating with the first flow passage and a gate communicating with the second flow passage, the valve pin being drivingly movable in the first and second flow passages along the extending direction of the longitudinal axis to open or close the gate, wherein,
the tip device includes an upper tip in contact with the hot nozzle and a lower tip defining the gate, the lower tip having a hardness greater than a hardness of the upper tip and a thermal conductivity less than a thermal conductivity of the upper tip.
As a further improvement of an embodiment of the present invention, the tip device further includes an outer tip, a part of the outer tip covers a part of an outer periphery of the upper tip, and a part of the outer tip covers at least a part of an outer periphery of the lower tip, and a thermal conductivity of the outer tip is greater than a thermal conductivity of the lower tip.
Compared with the prior art, the invention has the beneficial effects that: because the tip device is arranged into an upper tip and a lower tip, the hardness of the lower tip is higher than that of the upper tip, and the thermal conductivity of the lower tip is lower than that of the upper tip. Thereby go up the mouth point and carry out the heat transfer, guaranteed the temperature of molten material, striking lower mouth point when needle moves down, lower mouth point's hardness is great, and is more wear-resisting and non-deformable. In conclusion, the hot nozzle assembly provided by the invention ensures that the nozzle tip device not only ensures the heat conductivity, but also is more wear-resistant and not easy to deform.
Drawings
FIG. 1 is a schematic longitudinal sectional view of a hot nozzle assembly according to an embodiment of the present invention;
FIG. 2 is a schematic longitudinal cross-sectional view of a hot nozzle assembly in an embodiment of the present invention with the valve pin removed;
fig. 3 is a partially enlarged schematic view at a in fig. 2.
Detailed Description
The present invention will be described in detail below with reference to specific embodiments shown in the drawings. These embodiments are not intended to limit the present invention, and structural, methodological, or functional changes made by those skilled in the art according to these embodiments are included in the scope of the present invention.
In the various illustrations of the present application, certain dimensions of structures or portions may be exaggerated relative to other structures or portions for ease of illustration and, thus, are provided to illustrate only the basic structure of the subject matter of the present application.
In the description of the embodiments of the present invention, the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "bottom", "inner" and "outer" etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are generally referred to in a normal mounting state of the hot nozzle assembly, and do not indicate that the indicated positions or elements must have specific orientations.
As shown in fig. 1, 2 and 3, a preferred embodiment of the hot nozzle assembly of the present invention, an embodiment of the present invention provides a hot runner system, which includes a hot nozzle assembly, a temperature control box and a hot runner at least formed in the hot nozzle assembly, and the plastic in a molten state is sequentially poured into a cavity of a mold through the hot nozzle assembly by means of heating and temperature controlling the plastic-injection material, so as to avoid forming a solidified material of the pouring system.
Specifically, the hot nozzle assembly is used for pouring plastic in a molten state, the hot nozzle assembly comprises a hot nozzle 12 extending along a longitudinal axis 24, a valve pin 14, and a nozzle tip device 16 partially positioned inside the hot nozzle 12, the hot runner system further comprises a driving unit (not shown) for driving the valve pin 14 to reciprocate along the longitudinal axis 24, the hot nozzle 12 and the nozzle tip device 16 are both provided in a hollow structure, the hot nozzle 12 defines a first flow passage 18, the nozzle tip device 16 defines a second flow passage 20 communicated with the first flow passage 18 and a pouring gate 22 communicated with the second flow passage 20, and the valve pin 14 can be driven to move in the first flow passage 18 and the second flow passage 20 along the extending direction of the longitudinal axis 24 so as to open or close the pouring gate 22.
In the present embodiment, the nozzle assembly has a central axis, and for clarity of location and orientation described in this application, reference is generally made to upstream and downstream of the hot runner in the nozzle assembly, and the direction from upstream to downstream of the hot runner along the central axis is defined as "lower" and vice versa as "upper". The molding material first enters the first flow path 18 defined by the hot nozzle 12, then flows down the second flow path 20, and finally flows out of the gate 22 and is injected into the cavity of the mold for casting. When the pouring is stopped, the valve pin 14 is driven to move downward to close the gate 22. In the preferred embodiment, the gate 22 is disposed coaxially with the first and second flow passages 18, 20. Of course, the extension axis of the gate 22 may be arranged to form an angle with the extension axes of the first flow channel 18 and the second flow channel 20, and in this case, the gate 22 may be arranged to be one, or two or more.
Further, the tip device 16 includes an upper tip 26 in contact with the hot nozzle 12 and a lower tip 28 defining the gate 22, the lower tip 28 having a hardness greater than that of the upper tip 26, and the lower tip 28 having a thermal conductivity less than that of the upper tip 26. The upper tip 26 defines a portion of the second flow channel 20, the lower tip 28 defines a portion of the second flow channel 20, and the molten molding material flows from the first flow channel 18 into the upper tip 26, then into the lower tip 28, and finally out through the gate 22.
In the preferred embodiment, since the tip assembly 16 is provided as two parts of the upper tip 26 and the lower tip 28, the hardness of the lower tip 28 is greater than that of the upper tip 26, and the thermal conductivity of the lower tip 28 is less than that of the upper tip 26. The upper tip 26 thus conducts heat transfer, ensuring the temperature of the molten material, and the lower tip 28 is harder, more wear resistant and less prone to deformation as the valve needle 14 impacts the lower tip 28 as it moves downwardly. In summary, the present invention provides a hot tip assembly that ensures thermal conductivity of the tip device 16, is more wear resistant, and is less prone to deformation.
In order to further improve the heat transfer of the nozzle tip device 16, the melting temperature of the injection molding material is ensured, so that the flowability of the injection molding material is better. The tip assembly 16 further includes an outer tip 30, a portion of the outer tip 30 being wrapped around a portion of the outer periphery of the upper tip 26, and a portion of the outer tip 30 being wrapped around at least a portion of the outer periphery of the lower tip 28, the outer tip 30 having a thermal conductivity greater than the thermal conductivity of the lower tip 28. Circumferentially, a portion of the inner side of the outer tip 30 abuts a portion of the outer side of the upper tip 26 and a portion of the inner side of the outer tip 30 abuts at least a portion of the outer side of the lower tip 28, such that the outer tip 30 transfers heat from the hot nozzle 12 to the upper tip 26 and the lower tip 28, and ultimately to the injection molded material.
Further, circumferentially, a portion of the outer tip 30 is located between the hot nozzle 12 and the upper tip 26, and a portion of the outer tip 30 is located between the hot nozzle 12 and the lower tip 28.
In the direction of extension of the longitudinal axis 24, the upper tip 26 abuts the hot nozzle 12, the lower tip 28 abuts the upper tip 26, and the outer tip 30 abuts both the upper tip 26 and the lower tip 28, the outer tip 30 being fixed relative to the hot nozzle 12. Specifically, the upper tip 26 includes a lower end portion abutting the lower tip 28 and an upper end portion projecting from the lower end portion in the circumferential direction, and the outer tip 30 abuts the upper end portion. The outer tip 30 also has an inwardly extending first inner ledge 32, the first inner ledge 32 also abutting the lower end. Further, the outer tip 30 has an inwardly extending second inner projection 34, and the lower tip 28 has an outwardly extending first outer projection 36, the second inner projection 34 abutting the first outer projection 36 to axially limit movement of the lower tip 28.
In the preferred embodiment, the lower tip 28 is made of tungsten steel, which is harder, although other harder materials may be used for the lower tip 28. The upper tip 26 and the outer tip 30 are made of copper, which has good thermal conductivity, although other materials having good thermal conductivity may be used for the upper tip 26 and the outer tip 30. In addition, the material of the upper tip 26 and the outer tip 30 may be designed to be the same, and the material of the upper tip 26 and the material of the outer tip 30 may be designed to be different.
The hot nozzle assembly further includes a pressing cap 38 fixedly attached to the hot nozzle 12, and in the preferred embodiment, the pressing cap 38 is fixedly attached to the inside of the hot nozzle 12 by threads, and in the direction of extension of the longitudinal axis 24, the pressing cap 38 abuts the outer tip 30 to secure the tip assembly 16 to the inside of the hot nozzle 12. Specifically, the outer tip 30 has a second outer land 40 extending outwardly in the circumferential direction, and the pressure cap 38 has a third inner land 42 extending inwardly, the third inner land 42 abutting the second outer land 40 to axially restrict movement of the outer tip 30. The press cap 38 is typically made of W302 mill steel, although other materials may be used for the press cap 38, and the press cap 38 is provided to secure the tip assembly 16 to the hot nozzle 12.
In addition, the end of the lower tip 28 protrudes beyond the end of the outer tip 30. And the distal end of the lower tip 28 and the distal end of the outer tip 30 are each provided as a tapered surface at an angle to the longitudinal axis 24. further, the angle of inclination between the distal end of the lower tip 28 and the longitudinal axis 24 is the same as the angle of inclination between the distal end of the outer tip 30 and the longitudinal axis 24. In the direction of extension of the longitudinal axis 24, the end of the lower tip 28 and the end of the outer tip 30 each project beyond the pressure cap 38.
The hot nozzle assembly includes an insulating sleeve 44 that wraps around the outer periphery of the distal end of the lower tip 28 and the outer tip 30, and the thermal conductivity of both the lower tip 28 and the outer tip 30 is greater than the thermal conductivity of the insulating sleeve 44. The insulating sleeve 44 is typically a plastic piece that is compressed against the outer sides of the ends of the lower tip 28 and the outer tip 30. The insulating sleeve 44 serves to reduce the amount of heat transferred to the mold.
It should be understood that although the present description refers to embodiments, not every embodiment contains only a single technical solution, and such description is for clarity only, and those skilled in the art should make the description as a whole, and the technical solutions in the embodiments can also be combined appropriately to form other embodiments understood by those skilled in the art.
The above-listed detailed description is only a specific description of a possible embodiment of the present invention, and they are not intended to limit the scope of the present invention, and equivalent embodiments or modifications made without departing from the technical spirit of the present invention should be included in the scope of the present invention.

Claims (10)

1. A hot nozzle assembly comprising a hot nozzle extending along a longitudinal axis, a valve pin, and a tip device located partially inside the hot nozzle, the hot nozzle defining a first flow passage, the tip device defining a second flow passage in communication with the first flow passage and a gate in communication with the second flow passage, the valve pin being movably disposed within the first and second flow passages along the longitudinal axis to open or close the gate,
the tip device includes an upper tip in contact with the hot nozzle and a lower tip defining the gate, the lower tip having a hardness greater than a hardness of the upper tip and a thermal conductivity less than a thermal conductivity of the upper tip.
2. A hot nozzle assembly as claimed in claim 1, wherein said tip means further comprises an outer tip, part of said outer tip being wrapped around part of the periphery of said upper tip and part of said outer tip being wrapped around at least part of the periphery of said lower tip, said outer tip having a thermal conductivity greater than the thermal conductivity of said lower tip.
3. A hot nozzle assembly according to claim 2, wherein, in the circumferential direction, a portion of the outer tip is located between the hot nozzle and the upper tip, and a portion of the outer tip is located between the hot nozzle and the lower tip.
4. A hot nozzle assembly according to claim 2, wherein in the direction of extension of the longitudinal axis the upper tip abuts the hot nozzle, the lower tip abuts the upper tip, and the outer tip abuts both the upper tip and the lower tip, the outer tip being stationary relative to the hot nozzle.
5. A hot nozzle assembly according to claim 4, further comprising a pressing cap fixedly attached to the inside of the hot nozzle by threads, and wherein the pressing cap abuts the outer nozzle tip in the direction of extension of the longitudinal axis to secure the nozzle tip device to the inside of the hot nozzle.
6. The hot nozzle assembly of claim 2, wherein a distal end of the lower tip protrudes beyond a distal end of the outer tip.
7. The hot nozzle assembly of claim 1, wherein the lower nozzle tip is tungsten steel.
8. A hot nozzle assembly as claimed in claim 1, including an insulating sleeve covering a distal periphery of said lower tip and a distal periphery of said outer tip, said lower tip and said outer tip each having a thermal conductivity greater than a thermal conductivity of said insulating sleeve.
9. A hot-runner system including a hot-nozzle assembly for pouring a plastic in a molten state, the hot-nozzle assembly including a hot nozzle extending along a longitudinal axis, a valve pin, and a tip device located partially inside the hot nozzle, the hot-runner system further including a drive unit for driving the valve pin to reciprocate along the longitudinal axis, the hot nozzle defining a first flow passage, the tip device defining a second flow passage communicating with the first flow passage and a gate communicating with the second flow passage, the valve pin being drivingly movable within the first and second flow passages in a direction extending along the longitudinal axis to open or close the gate,
the tip device includes an upper tip in contact with the hot nozzle and a lower tip defining the gate, the lower tip having a hardness greater than a hardness of the upper tip and a thermal conductivity less than a thermal conductivity of the upper tip.
10. The hot-runner system of claim 9, wherein the tip arrangement further comprises an outer tip, a portion of the outer tip being wrapped around a portion of an outer periphery of the upper tip and a portion of the outer tip being wrapped around at least a portion of an outer periphery of the lower tip, the outer tip having a thermal conductivity greater than a thermal conductivity of the lower tip.
CN201911034621.0A 2019-10-29 2019-10-29 Hot nozzle assembly and hot runner system Pending CN110722746A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201911034621.0A CN110722746A (en) 2019-10-29 2019-10-29 Hot nozzle assembly and hot runner system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201911034621.0A CN110722746A (en) 2019-10-29 2019-10-29 Hot nozzle assembly and hot runner system

Publications (1)

Publication Number Publication Date
CN110722746A true CN110722746A (en) 2020-01-24

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
CN201911034621.0A Pending CN110722746A (en) 2019-10-29 2019-10-29 Hot nozzle assembly and hot runner system

Country Status (1)

Country Link
CN (1) CN110722746A (en)

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