CN101249712A - Hot-runner pin valve type nozzle for injection molding - Google Patents
Hot-runner pin valve type nozzle for injection molding Download PDFInfo
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- CN101249712A CN101249712A CNA2008100918874A CN200810091887A CN101249712A CN 101249712 A CN101249712 A CN 101249712A CN A2008100918874 A CNA2008100918874 A CN A2008100918874A CN 200810091887 A CN200810091887 A CN 200810091887A CN 101249712 A CN101249712 A CN 101249712A
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- runner
- hot
- injection molding
- valve type
- cast gate
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Abstract
The invention discloses a hot-runner pin-valve nozzle for injection molding, which comprises a nozzle body and a heater. A runner for liquated resin to flow through and a valve pin are arranged in the nozzle body. A gate for injecting the liquated resin into a mold is arranged on the front end of the nozzle body. The nozzle is characterized in that the gate is eccentrically arranged relative to the center of the nozzle body. Owing to the eccentric arrangement, the gate can enter the narrow and concave part during the manufacture of products with narrow space and concavity, so that the gate mark is not left on the outer surface of the product but on the inner side thereof. In addition, the contact between the valve pin and the liquated resin is minimized so as to prevent the valve pin from being damaged.
Description
Technical field
The present invention relates to a kind of die injection moulding device, be specifically related to a kind of hot-runner pin valve type nozzle that injects molten resin to mould.
Background technology
Hot-runner nozzle on the mould is the device that injects melted material to the die cavity of mould, comprise nozzle body and be arranged at heater on the body, be provided with the runner that runs through body, supplies molten resin to move in the nozzle body, the needle that is promoted by piston-cylinder is set at described runner central authorities, the nozzle body front end shrinks to the centre and constitutes cast gate, described runner is connected with flow distribution plate, molten resin is in flow distribution plate flows into runner, needle moves back and forth the switching cast gate in runner, molten resin injects in the mold cavity from cast gate.
Yet, because the cast gate of spray nozzle front end is positioned on the body longitudinal axis, i.e. body front end center, thereby have certain distance between cast gate and body housing, when there was recessed and narrow part in mould, the inlet of cast gate peripheral part and groove had interference and can't put into inside, for example, moulding "
" during the shape product (position that narrow space caves inward again); be subjected to the interference of nozzle body around the cast gate; cast gate can't be arranged on the part that falls in;; cast gate is located at the outside (outside at indent position) of product, and so the product after the moulding will stay the vestige of cast gate on the outer surface, need to remove by the subsequent treatment operation; both prolonged the production cycle, and increased production cost again so existing settling mode is.
In addition because needle is positioned at runner, and reciprocating in runner, forming keying to cast gate, and needle long-term with runner in molten resin back and forth contact, surperficially easily wear and tear.
Moreover the nozzle cast gate is generally and the integrated metal material of body, thereby the outside heat loss in cast gate place is big, easily hardens at the molten resin near the cast gate place like this, influences the flowability of molten resin.
Summary of the invention
The object of the invention provides a kind of hot-runner pin valve type nozzle for injection molding, uses this structure nozzle, can be used for the product that the injection moulding narrow space caves inward again, and gate vestiges is stayed in the product inboard but not the outside.
Another purpose of the present invention provides and a kind ofly can reduce to greatest extent that needle contacts with molten resin and the hot-runner pin valve type nozzle for injection molding that weares and teares.
For achieving the above object, the technical solution used in the present invention is: a kind of hot-runner pin valve type nozzle for injection molding, comprise nozzle body and heater, be provided with the runner and the needle that flow for molten resin in the described body, the leading section of body is provided with the cast gate that injects mould for molten resin, and described cast gate is provided with respect to the center of described body is eccentric.
In the technique scheme, open and close the needle of described cast gate, the needle action hole that it passed through is provided with respect to described body is eccentric.
Further technical scheme is, described needle action hole and described runner are independent setting the respectively, and both join crossing near described cast gate place, form the spatial portion that spues.The heat of described heater passes to molten resin through the described spatial portion that spues, and the described spatial portion inwall that spues is provided with lining.The material that forms described lining is Be.
Moreover, be the center with described runner, described heater is positioned at the offside in described needle action hole, and is provided with the insulated space portion that allows heat transmission make a circulation in the middle of described heater and described runner.The circuitous transmission of heat, promptly heat gets around this place when running into insulated space portion, and each part that is diffused into the metal body of periphery gets on, and thermal conductivity is improved, and Speed of diffusion increases, and forms even temperature and distributes, and improves the quality of injecting products; In addition, insulated space portion is provided with the metal volume that has reduced body, and the heat of each unit volume improves, and more can keep the condition of high temperature.
In the technique scheme, on the front end periphery of described cast gate, be provided with the heat insulation loop of making by pottery.Because the thermal conductivity of pottery is low, can reduce the thermal loss at nearly cast gate place.
In the technique scheme, described body is connected with flow distribution plate through screw, and promptly body and flow distribution plate are for dividing body structure, and both connect through screw, thereby can be convenient to the making of body, as the moulding to body inner flow passage, needle action hole.
Because the technique scheme utilization, the present invention compared with prior art has following advantage:
Since the cast gate that is positioned at the nozzle body front end among the present invention be set on the eccentric position with respect to the body center, compare with the cast gate on being positioned at body longitudinal central axis line in the past, cast gate can be stretched in the mold cavity that narrow space falls in again, make the gate vestiges of shaped article be positioned at the product inboard, but not product outer surface, save the subsequent handling of place to go gate vestiges, shortened the production cycle, reduced production cost;
2. owing to needle moved hole and runner are independent respectively to be provided with, the needle spatial portion that only spues in the end contacts with molten resin, when reducing the needle reciprocating motion to greatest extent with the contacting of molten resin, thereby prevented the damage of needle;
3. the cast gate periphery of nozzle body front end is set up the heat insulation loop that pottery forms, and reduces the loss of the spatial portion heat that spues, and prevents that temperature from descending and the molten resin sclerosis that causes.
Description of drawings
Fig. 1 is the cross-sectional view of the embodiment of the invention one;
Fig. 2 is the left view of Fig. 1;
Fig. 3 is that the A-A of Fig. 1 accompanies face figure;
Fig. 4 is the local user mode cut-away view of body front end in the embodiment of the invention one;
Fig. 5 is the scatter chart of body leading section temperature and time in the past;
Fig. 6 is the scatter chart of body leading section temperature and time in the embodiment of the invention one.
Wherein: 1, flow distribution plate; 2, needle; 3, piston; 4, cylinder; 10, body; 11, cast gate; 12, runner; 13, needle action hole; 14, the spatial portion that spues; 15, insulated space portion; 20, heater; 30, lining; 40, collet.
The specific embodiment
Below in conjunction with drawings and Examples the present invention is further described:
Embodiment one: extremely shown in Figure 6 referring to Fig. 1, a kind of hot-runner pin valve type nozzle for injection molding, comprise nozzle body 10, be provided with the runner 12 that flows for molten resin in the body, the leading section of body 10 is provided with the cast gate 11 that molten resin injects mould, described cast gate 11 is not on the center of body 10, but eccentric form.Body inner flow passage 12 is connected with flow distribution plate 1 inner flow passage, molten resin injects body inner flow passage 12 from flow distribution plate 1 inner flow passage, and move to cast gate 11 places, by needle the moving back and forth in needle action hole 13 that drives by piston 3 and cylinder 4 in the body 10, realize opening and closing cast gate 11, described piston 3 is located at flow distribution plate 1 respectively with cylinder 4, as shown in Figure 1.Described needle action hole 13 is not or not the center of body 10, but eccentric formation, needle 2 straight reciprocating motions open and close cast gate 11, therefore the axis in cast gate 11 and needle action hole 13 is on same straight line, that is to say that cast gate 11 and needle action hole 13 is together with respect to body 10 center off-centre, described runner 12 and heater 20 lay respectively at the opposite side at cast gate 11 centers, as shown in Figure 4, so just cast gate 11 can be stretched into "
" in the narrow space of shape (concave shaped), avoid staying gate vestiges at the shaped article outer surface.
As Fig. 1, shown in Figure 3, needle action hole 13 and runner 12 all are relatively independent formation, in needle action hole 13 and the runner 12 runner 12 than needle action hole 13 more near the center of body 10, described needle action hole 13 and runner 12 are at the spatial portion 14 that spues near the crossing formation in cast gate 11 places, molten resin flows into from runner 12 in this spatial portion 14 that spues, needle 2 enters the spatial portion 14 that spues by needle action hole 13, thereby just contact when only having the needle front end to spue in the spatial portion 14 with molten resin, can limit ground reduce contacting of needle 2 and molten resin, and then the wearing and tearing of minimizing needle.
As shown in Figure 4, the described inwall that spues spatial portion 14 is provided with lining 30, this lining 30 is made of the Be higher than iron and steel thermal conductance, therefore effectively heat is passed to the spatial portion 14 that spues by heater 20, the sclerosis of molten resins in the spatial portion 14 thereby inhibition spues.In addition, with runner 12 is the center, heater 20 is on the opposite in needle action hole 13, as shown in figures 1 and 3,12 of heater 20 and runners offer one allows heat transmit circuitous insulated space portion 15, described insulated space portion 15 is to be formed by air layer, when heat transmits (heat that heater 20 produces passes to runner 12 and the spatial portion 14 that spues by body 10), heat is passed to after the insulated space portion 15 just not by the air layer of thermal conductance than metal difference, but get around insulated space portion 15, the metal that is diffused into periphery gets on, so the heat that heater 20 produces more promptly is delivered to runner 12 and the spatial portion 14 that spues, the raising thermal conductivity.In conjunction with above-mentioned 2 points, done following comparison:
Be not have insulated space portion 15 as shown in Figure 5 in the past, and the material of lining 30 when being iron and steel Temperature Distribution and the curve map of variations in temperature, shown in Figure 6 is curve map when possessing insulated space portion 15 and lining 30 as mentioned above.Among the figure, mark a, b indication are to record the temperature that meets two places, lining 30 places, and mark c, d indication are that two places of runner inside record temperature.In Fig. 5, can see, when arrive time a, b, c, the d4 place of fixed temperature (300 degree) all different, and the time that 4 places are used is also widely different, the temperature deviation that reaches institute preceding 4 places of fixed temperature is big, as seen temperature distributing disproportionation is spared.Again as shown in Figure 6, measure the time much less that the place reaches institute's fixed temperature than Fig. 5 at each, and temperature deviation is less, Temperature Distribution is also even.Therefore, the setting of insulated space portion 15 and lining 30 is improved thermal conductivity, Speed of diffusion increases, and the heat that heater 20 produces is diffused into each part of body 10 rapidly, forms even temperature and distributes, and make molten resin keep even high temperature, improve the quality of injecting products.Also have, the overall volume of body 10 reduces (minimizings of metal heat-conducting volume), and the heat of each unit volume improves, thus than insulated space portion 15 not the time, body 10 more can be kept the condition of high temperature.
In the present embodiment, as shown in Figure 4, the front end outside of described cast gate 11 is provided with the heat insulation loop of being made by pottery 40, because the thermal conductance of pottery is very poor, therefore can cuts off the heat of the spatial portion 14 that spues and outwards emit and lose.
In addition, body 10 is to divide body structure with flow distribution plate, installs by screw to connect (drawing is not looked), makes nozzle body be easier to make, and can form by perforation operations such as deep holes as intrinsic runner 12 and needle action hole 13.
Claims (8)
1. hot-runner pin valve type nozzle for injection molding, comprise nozzle body and heater, be provided with the runner and the needle that flow for molten resin in the described body, the leading section of body is provided with the cast gate that injects mould for molten resin, it is characterized in that: described cast gate is provided with respect to the center of described body is eccentric.
2. hot-runner pin valve type nozzle for injection molding according to claim 1 is characterized in that: open and close the needle of described cast gate, the needle action hole that it passed through is provided with respect to described body is eccentric.
3. hot-runner pin valve type nozzle for injection molding according to claim 2 is characterized in that: described needle action hole and described runner are independent setting the respectively, and both join crossing near described cast gate place, form the spatial portion that spues.
4. hot-runner pin valve type nozzle for injection molding according to claim 3 is characterized in that: the heat of described heater passes to molten resin through the described spatial portion that spues, and the described spatial portion inwall that spues is provided with lining.
5. hot-runner pin valve type nozzle for injection molding according to claim 4 is characterized in that: the material that forms described lining is Be.
6. according to arbitrary described hot-runner pin valve type nozzle for injection molding in the claim 2 to 5, it is characterized in that: with described runner is the center, described heater is positioned at the offside in described needle action hole, and is provided with the insulated space portion that allows heat transmission make a circulation in the middle of described heater and described runner.
7. hot-runner pin valve type nozzle for injection molding according to claim 6 is characterized in that: on the front end periphery of described cast gate, be provided with the heat insulation loop of being made by pottery.
8. according to arbitrary described hot-runner pin valve type nozzle for injection molding in the claim 1 to 5, it is characterized in that: described body is connected with flow distribution plate through screw.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2008100918874A CN101249712B (en) | 2008-04-02 | 2008-04-02 | Hot-runner pin valve type nozzle for injection molding |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2008100918874A CN101249712B (en) | 2008-04-02 | 2008-04-02 | Hot-runner pin valve type nozzle for injection molding |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101249712A true CN101249712A (en) | 2008-08-27 |
| CN101249712B CN101249712B (en) | 2011-04-06 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2008100918874A Active CN101249712B (en) | 2008-04-02 | 2008-04-02 | Hot-runner pin valve type nozzle for injection molding |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101817215A (en) * | 2010-05-11 | 2010-09-01 | 常州工学院 | Valve type control device for main-runner sprue hole of injection mould |
| CN103112129A (en) * | 2013-02-19 | 2013-05-22 | 成都市联余精密机械有限公司 | Thermal nozzle die applied to PET (Polyethylene Terephthalate) plastic product |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2638963Y (en) * | 2003-07-17 | 2004-09-08 | 上海克朗宁技术设备有限公司 | Hot runner pneumatic needle valve type single jet for injection moulding |
-
2008
- 2008-04-02 CN CN2008100918874A patent/CN101249712B/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101817215A (en) * | 2010-05-11 | 2010-09-01 | 常州工学院 | Valve type control device for main-runner sprue hole of injection mould |
| CN101817215B (en) * | 2010-05-11 | 2012-05-23 | 常州工学院 | Valve type control device for main-runner sprue hole of injection mould |
| CN103112129A (en) * | 2013-02-19 | 2013-05-22 | 成都市联余精密机械有限公司 | Thermal nozzle die applied to PET (Polyethylene Terephthalate) plastic product |
| CN103112129B (en) * | 2013-02-19 | 2015-06-10 | 成都市联余精密机械有限公司 | Thermal nozzle die applied to PET (Polyethylene Terephthalate) plastic product |
Also Published As
| Publication number | Publication date |
|---|---|
| CN101249712B (en) | 2011-04-06 |
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| C14 | Grant of patent or utility model | ||
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Owner name: HOTSYS HOT RUNNER TECHNOLOGY (SUZHOU) CO., LTD. Free format text: FORMER OWNER: XU NANXU Effective date: 20120911 |
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| C41 | Transfer of patent application or patent right or utility model | ||
| COR | Change of bibliographic data |
Free format text: CORRECT: ADDRESS; TO: 215341 SUZHOU, JIANGSU PROVINCE |
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| TR01 | Transfer of patent right |
Effective date of registration: 20120911 Address after: The joint road Kunshan City Qiandeng Town of Jiangsu Province, No. 28 215341 Patentee after: HOTSYS HOT RUNNER TECHNOLOGY (SUZHOU) CO., LTD. Address before: Anshan City, Gyeonggi Do Korean reunion area of the original hole 10B/39L 782-12 and a half Development Zone Patentee before: Xu Nanxu |