CN110757740A - Movable valve needle hot runner structure - Google Patents
Movable valve needle hot runner structure Download PDFInfo
- Publication number
- CN110757740A CN110757740A CN201810850195.7A CN201810850195A CN110757740A CN 110757740 A CN110757740 A CN 110757740A CN 201810850195 A CN201810850195 A CN 201810850195A CN 110757740 A CN110757740 A CN 110757740A
- Authority
- CN
- China
- Prior art keywords
- needle
- guide
- hole
- hot runner
- movable valve
- 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.)
- Withdrawn
Links
- 238000002347 injection Methods 0.000 claims abstract description 42
- 239000007924 injection Substances 0.000 claims abstract description 42
- 239000000463 material Substances 0.000 claims abstract description 35
- 230000000149 penetrating effect Effects 0.000 claims abstract description 9
- 238000010438 heat treatment Methods 0.000 claims abstract description 6
- 239000012943 hotmelt Substances 0.000 claims description 8
- 230000000903 blocking effect Effects 0.000 claims description 2
- 238000002844 melting Methods 0.000 claims description 2
- 230000008018 melting Effects 0.000 claims description 2
- 238000010276 construction Methods 0.000 claims 3
- 239000007787 solid Substances 0.000 description 8
- 238000004519 manufacturing process Methods 0.000 description 5
- 238000012423 maintenance Methods 0.000 description 2
- 238000009966 trimming Methods 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- DMFGNRRURHSENX-UHFFFAOYSA-N beryllium copper Chemical compound [Be].[Cu] DMFGNRRURHSENX-UHFFFAOYSA-N 0.000 description 1
- -1 beryllium copper) Chemical compound 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000001746 injection moulding Methods 0.000 description 1
- 230000001788 irregular Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000000750 progressive effect Effects 0.000 description 1
- 239000010409 thin film Substances 0.000 description 1
Images
Classifications
-
- 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
Abstract
A movable valve pin hot runner configuration comprising at least: a body with through-shaped shaft hole, a needle valve which can move back and forth in the shaft hole of the body, a heating coil which surrounds the periphery of the body, a group of locking pieces which are arranged at the body, and a material guide cylinder which is clamped between the containing groove of the body and the locking pieces, wherein: the guide cylinder at least comprises a seat part clamped between the containing groove of the body and the locking part, a cylinder body section extending upwards from the seat part and protruding out of the locking part, a through hole penetrating from the seat part to the cylinder body section, and a group of guide units arranged at the front end of the cylinder body section, wherein the guide units are provided with a penetrating injection hole which can be communicated with the through hole.
Description
Technical Field
The invention relates to a movable valve needle hot runner; in particular to a movable valve needle hot runner structure which can ensure that no hole expansion is generated in a material injection hole of a material guide cylinder and an injection hole of a mould so as to form excessive plastic rubber blanks by over-injection.
Background
Referring to fig. 1 to 5, a conventional valve pin type hot runner structure includes: a body 10 having a through-shaped shaft hole 100, a needle valve 12 capable of moving back and forth in the shaft hole 100 of the body 10, a heating coil 11 surrounding the outer periphery of the body 10, a set of locking members 13 disposed at the body 10, and a guiding barrel 14 sandwiched between the receiving slot 101 of the body 10 and the locking members 13, wherein the guiding barrel 14 at least comprises a seat 140 sandwiched between the receiving slot 101 of the body 10 and the locking members 13, a barrel section 141 extending upward from the seat 140 and protruding outside the locking members 13, a receiving slot 142 disposed between the seat 140 and the barrel section 141, and a filling hole 143 penetrating through the top surface of the barrel section 141 and communicating with the receiving slot 142, so that when the tip 120 of the needle valve 12 is pulled inward into the receiving slot 142, the filling hole 143 of the guiding barrel 14 is opened (i.e. not blocked by the needle rod 120, as shown in fig. 3), so that the hot-melted semi-solid plastic blank b can flow through the cavity 21 of the mold 2 from the material injection hole 143 until the mold is filled, and then the end of the needle rod 120 of the needle valve 12 is pushed outward by applying force, so that the end of the needle rod 120 will be guided along the inner wall surface of the material guiding cylinder 14 and be blocked in the material injection hole 143 and the injection port 20 of the mold 2 (as shown in fig. 2), thereby completing the production of one plastic injection operation.
Because the end of the needle rod 120 of the needle valve 12 is pulled back from the inner wall surface of the material injection hole 143 to the inside and moves to the large-sized chamber 142, at this time, the needle rod 120 is not only displaced due to the thermal expansion of the needle valve 12, but also extruded by the thermally melted semi-solid plastic blank b, so that the end of the needle rod 120 leans against the inner wall surface of the chamber 142 (as shown in fig. 3), until the needle rod 120 is closed, the needle rod 120 is pushed outward again, so that the end of the needle rod 120 is guided along the inner wall surface of the chamber 142 to move against the inner wall surface of the chamber 142, until the end of the needle rod 120 is pushed into the material injection hole 143 and the injection hole 20 of the mold 2 at the same time; moreover, in order to keep the fluidity of the hot-melt semi-solid plastic blank b in the guiding cylinder 14 to be optimized, the material of the guiding cylinder 14 is usually selected to be copper (such as beryllium copper), that is, the hardness or wear resistance of the guiding cylinder 14 cannot be greatly improved, so that the hardness or wear resistance of the needle bar 120 is greater than that of the guiding cylinder 14, and the inner wall surface of the injection hole 143 and the inner wall surface of the injection hole 20 of the mold 2 are easily scratched by the back and forth movement of the hard needle bar 120 during the closing operation, so that the injection hole 143 and the injection hole 20 are both expanded (i.e. a gap a is formed between the needle bar 120 and the injection hole 143 and the injection hole 20, as shown in fig. 4), and the hot-melt semi-solid plastic blank b is injected out from the gap a to form an irregular thin film layer 1, thus, the quality of the injected product C is too rough, and the injected product C must be trimmed by additional manpower, which results in a significant problem of reduced work efficiency and increased labor cost.
As described above, since the holes 20 of the mold 2 and the holes 143 of the guide cylinder 14 are scratched to form the enlarged holes, the production must be stopped immediately, and the mold 2 and the guide cylinder 14 must be repaired or replaced, which not only causes immediate loss of production stoppage and greatly reduces the production yield, but also increases the cost for maintaining the mold or the guide cylinder.
Therefore, how to develop a plastic blank that will not be scratched in the injection hole or the injection hole to form a corresponding hole, is a problem that needs to be solved first.
Disclosure of Invention
The invention provides a movable valve pin hot runner structure, which at least comprises: a body with through-shaped shaft hole, a needle valve which can move back and forth in the shaft hole of the body, a heating coil which surrounds the periphery of the body, a group of locking pieces which are arranged at the body, and a material guide cylinder which is clamped between the containing groove of the body and the locking pieces, wherein: the guide cylinder at least comprises a seat part clamped between the containing groove of the body and the locking part, a cylinder body section extending upwards from the seat part and protruding out of the locking part, a through hole penetrating from the seat part to the cylinder body section, and a group of guide units arranged at the front end of the cylinder body section, wherein the guide units are provided with a penetrating injection hole which can be communicated with the through hole; through the structure, the needle rod of the needle valve can move back and forth in the guide unit at the front end of the guide cylinder, and the material injection hole of the guide unit is not scratched by the tail end of the needle rod to form a reaming phenomenon, so that the hot melting plastic blank is not overflowed.
Preferably, the wear resistance of the pilot unit must be greater than that of the guide cylinder, and the wear resistance of the pilot unit cannot be less than that of the needle rod of the needle valve.
Preferably, a conical convergent guide surface is formed on the inner wall of the material injection hole communicated with the pilot unit, and the guide surface can be used as the guide direction of the needle rod of the needle valve when the needle rod slides against the guide surface.
Preferably, the body is axially provided with a through-hole for accommodating the needle rod of the needle valve and the hot-melt plastic material in the hole for movement, and the other end of the hole is communicated to form an accommodating groove, and a thread part is formed on the inner wall edge of the accommodating groove for the locking part to be screwed on the thread part, and the seat part of the guide cylinder can be clamped between the accommodating groove of the body and the bottom end surface of the locking part, and the hole is communicated with the through hole of the guide cylinder in a coaxial manner.
Preferably, the needle rod end of the needle valve is blocked in the material injection hole of the pilot unit and is in a closed state under a normal state.
Preferably, the locking member includes an external thread screwed to the threaded portion of the body, a pulling portion connected to a position above the external thread, a surrounding portion connected to a position above the pulling portion, and an axially disposed through-shaped receiving portion.
Preferably, the guiding unit is provided with a convex annular protrusion, so that the annular protrusion can be more tightly covered by the guiding cylinder, and the bonding strength between the guiding cylinder and the guiding cylinder can be increased.
Preferably, the guide unit is provided with a threaded portion, so that the threaded portion can be screwed with the threaded portion at the front end of the guide cylinder, and the bonding strength between the guide cylinder and the guide cylinder can be increased.
Preferably, the hardness of the pilot unit cannot be less than that of the needle rod of the needle valve.
Therefore, the guide tube can not only ensure that the material injection hole is not scratched and is in a hole expansion phenomenon so as to improve the quality of a plastic injection finished product and reduce the cost of additional labor trimming, but also completely overcome the problem of material overflow which can not be solved by the existing valve needle type hot runner, simultaneously can prolong the whole service life of the guide tube, reduce the maintenance or replacement cost of a mold or the guide tube, and greatly improve the productivity and the working efficiency as the progressive proposition.
Drawings
Fig. 1 is a partial sectional view of a conventional apparatus.
Fig. 2 is a schematic partial sectional view of fig. 1 in use.
Fig. 3 is an assembled cross-sectional view of fig. 2 after actuation.
FIG. 4 is a cross-sectional view of the assembly of FIG. 3 after the actuation scratch.
Fig. 5 is a schematic cross-sectional view of the finished product produced in fig. 4.
Fig. 6 is a perspective view of the present invention.
Fig. 7 is an exploded perspective view of fig. 6.
Fig. 8 is a schematic partial sectional view of fig. 7 in use.
Fig. 9 is an enlarged sectional view of the assembly of fig. 8.
Fig. 10 is an assembled cross-sectional view of fig. 9 after actuation.
FIG. 11 is an assembled cross-sectional view of yet another embodiment of the present invention.
Description of the main element symbols:
5 main body
50 axle hole
51 containing groove
52 threaded part
58 heating coil
6 needle valve
60 needle bar
7 locking piece
70 external screw thread
71 wrenching part
72 surround part
73 locus of containment
8 guide cylinder
80 seat part
81 barrel section
82 perforation
83 stop ring
84 threaded segment
9 leading positive unit
90 annotate material hole
91 guide surface
92 Ring convex part
93 screw part
95 mould
950 injection port
951 mould cavity
Detailed Description
The present invention relates to a movable valve pin hot runner structure, as shown in fig. 6 to 10, which at least includes: a main body 5 having a through-shaped shaft hole 50, a needle valve 6 capable of moving back and forth in the shaft hole 50 of the main body 5, a heating coil 58 surrounding the outer periphery of the main body 5, a set of locking elements 7 disposed at the main body 5, and a guiding cylinder 8 sandwiched between the accommodating groove 51 of the main body 5 and the locking elements 7, wherein:
the body 5, its axial has shaft hole 50 of the run-through form, for the needle bar 60 of the needle valve 6 and plastic stock b of hot melt semi-solid form can hold and move in the shaft hole 50, and make the other end of the shaft hole 50 communicate and form a containing trough 51, and form the screw thread part 52 on the edge of inner wall of the containing trough 51, for the lock part 7 can be screwed in the screw thread part 52, and can clamp the seat 80 of the guide cylinder 8 between containing trough 51 and bottom end surface of the lock part 7 of the body 5, and make the shaft hole 50 and perforation 82 of the guide cylinder 8 present the concentric through-connection;
a needle valve 6, which at least comprises a needle bar 60 that is accommodated in the shaft hole 50 of the body 5, the through hole 82 of the guide cylinder 8 and the material injection hole 90 of the guide unit 9 and moves back and forth, and the end of the needle bar 60 is blocked in the material injection hole 90 of the guide unit 9, so as to form a closed state under a normal state; moreover, the hardness or wear resistance of the needle rod 60 of the needle valve 6 is greater than that of the guide cylinder 8;
a locking member 7, which comprises an external thread 70 screwed on the threaded portion 52 of the body 5, a wrenching portion 71 connected above the external thread 70, a surrounding portion 72 connected above the wrenching portion 71, and an axially disposed through-shaped accommodating portion 73, wherein the accommodating portion 73 is sleeved on the barrel section 81 of the material guiding barrel 8, and the barrel section 81 can protrude outside (or above) the accommodating portion 73 of the locking member 7;
a guiding barrel 8, which at least comprises a seat part 80 clamped between the containing groove 51 of the body 5 and the locking piece 7, a barrel body section 81 extending upwards from the seat part 80 and protruding out of the locking piece 7, a through hole 82 penetrating between the seat part 80 and the barrel body section 81, and a set of guiding units 9 arranged at the front end of the barrel body section 81; wherein the through hole 82 is used for accommodating the needle rod 60 of the needle valve 6 and the hot-melt semi-solid plastic blank b therein for movement, and a concave ring-shaped stop ring 83 is formed at the near front end of the through hole 82, so that the ring protrusion 92 of the guiding unit 9 can be assembled at the stop ring 83 to improve the bonding strength between the guiding cylinder 8 and the guiding unit 9;
the guiding unit 9 is provided with a penetrating material injection hole 90 for accommodating the needle bar 60 of the needle valve 6 and the hot-melt semi-solid plastic blank b therein for movement, and a guiding surface 91 communicated with the inner wall of the material injection hole 90 and formed with a conical shape of a bunch, wherein the material injection hole 90 can be aligned and communicated with the through hole 82 of the material guiding cylinder 8, and the guiding surface 91 is used for guiding the end of the needle bar 60 of the needle valve 6 in the abutting sliding process; moreover, the hardness or wear resistance of the pilot unit 9 must be greater than that of the guide cylinder 8, and the hardness or wear resistance of the pilot unit 9 cannot be less than that of the needle bar 60 of the needle valve 6; in addition, the guiding unit 9 is provided with a convex annular protrusion 92, so that the annular protrusion 92 can be more tightly covered by the stop ring 83 of the guiding cylinder 8, and the bonding strength between the two can be increased;
when injection molding is to be performed, the end of the needle rod 60 of the needle valve 6 is first pulled back from the material injection hole 90 to the region of the guide surface 91 of the positive unit 9, so that no blocking resistance is generated at the material injection hole 90, at this time, a hot-melt semi-solid plastic blank is pressed by a force to push the end of the needle rod 60 to one side to touch the guide surface 91 to be inclined, and at the same time, the plastic blank is pressed from the material injection hole 90 to flow through the injection port 950 of the mold 95 and then enter the mold cavity 951 until the plastic blank is full (as shown in fig. 10), and then the needle rod 60 of the needle valve 6 is started to be pushed forward, at this time, the hardness or wear resistance of the positive guide unit 9 must be greater than that of the material guide cylinder 8, and the hardness or wear resistance of the positive guide unit 9 cannot be less than that of the needle rod 60 of the needle valve 6; therefore, when the end of the needle bar 60 is pressed against and slides along the guiding surface 91 of the guiding unit 9 until the needle bar is forced to enter the material injecting hole 90, the end of the guiding rod 60 can be guided and corrected by the limitation of the material injecting hole 90, so that the position of the injection port 950 of the mold 95 (as shown in fig. 9) is not touched, and the plastic injection operation is completed once, and thus, it can not only ensure that the material injection hole 90 is not scratched to have a hole expansion phenomenon, so as to improve the quality of plastic injection and reduce the cost of additional labor trimming, can completely overcome the problem of flash which can not be solved by the prior valve needle type hot runner, simultaneously can prolong the whole service life of the guide cylinder 8, can reduce the maintenance or replacement cost of the mould 2 or the guide cylinder 8, and the production problem caused by shutdown can be avoided, so that the productivity and the working efficiency are greatly improved.
Please refer to fig. 11, which is a diagram of another embodiment of the present invention, wherein the main changes are: the combination of the guiding unit 9 and the guiding barrel 8 is changed from the original engagement and covering manner to the screwing manner, in other words, the position of the ring protrusion 92 of the guiding unit 9 is changed to be provided with the threaded portion 93, and the position of the stop ring 83 of the guiding barrel 8 is changed to be provided with the threaded portion 84, so that the threaded portion 93 of the guiding unit 9 can be directly screwed on the threaded portion 84 at the front end of the guiding barrel 8, so that the guiding unit 9 can be tightly screwed and fixed at the front end of the guiding barrel 8, and the combination strength between the guiding unit 9 and the guiding barrel 8 is increased; the structures of the main body 5, the needle valve 6, the locking member 7, the guiding cylinder 8, the guiding unit 9, and the mold 95 are described in detail above, and therefore will not be described herein.
The above description is only for the preferred embodiment of the present invention, and is not intended to limit the scope of the present invention; therefore, all the equivalent changes or modifications according to the features and the spirit of the claims should be included in the claims of the present invention.
Claims (10)
1. A movable valve pin hot runner structure, comprising at least: a body with through-shaped shaft hole, a needle valve which can move back and forth in the shaft hole of the body, a heating coil which surrounds the periphery of the body, a group of locking pieces which are arranged at the body, and a material guide cylinder which is clamped between the containing groove of the body and the locking pieces, wherein:
the guide cylinder at least comprises a seat part clamped between the containing groove of the body and the locking part, a cylinder body section extending upwards from the seat part and protruding out of the locking part, a through hole penetrating from the seat part to the cylinder body section, and a group of guide units arranged at the front end of the cylinder body section, wherein the guide units are provided with a penetrating injection hole which can be communicated with the through hole, and the hardness of the guide units is larger than that of the guide cylinder;
through the structure, the needle rod of the needle valve can move back and forth in the guide unit at the front end of the guide cylinder, and the material injection hole of the guide unit is not scratched by the tail end of the needle rod to form a reaming phenomenon, so that the hot melting plastic blank is not overflowed.
2. The movable valve pin hot runner structure of claim 1, wherein the wear resistance of the pilot unit must be greater than that of the guide cylinder, and the wear resistance of the pilot unit must not be less than that of the needle bar of the needle valve.
3. The movable valve pin hot runner structure of claim 1 or 2, wherein a conical convergent guide surface is formed on the inner wall of the material injection hole connected to the pilot unit, and the guide surface can be used as a guide direction for the needle rod of the needle valve when the needle rod slides against the guide surface.
4. The movable valve needle hot runner structure of claim 3, wherein the body has an axial hole extending therethrough for receiving the needle rod of the needle valve and the hot melt plastic material therein, and a receiving groove is formed at the other end of the axial hole, and a threaded portion is formed at an inner wall edge of the receiving groove for allowing the locking member to be screwed to the threaded portion, and the guiding barrel seat is sandwiched between the receiving groove of the body and a bottom end surface of the locking member, such that the axial hole and the through hole of the guiding barrel are coaxially connected.
5. The movable valve pin hot runner construction of claim 4 wherein the needle stem tip of the needle valve is normally closed by blocking within the feed hole of the pilot unit.
6. The movable valve pin hot runner structure of claim 5, wherein the locking element comprises an external thread screwed to the threaded portion of the body, a pulling portion connected to the upper portion of the external thread, a surrounding portion connected to the upper portion of the pulling portion, and an axially disposed through-receiving portion.
7. The movable valve pin hot runner structure of claim 6, wherein the pilot unit has a convex ring protrusion, so that the ring protrusion can be more tightly covered by the guide cylinder, thereby increasing the bonding strength between the guide cylinder and the guide cylinder.
8. The movable valve pin hot runner structure of claim 6, wherein the pilot unit is provided with a threaded portion so that the threaded portion can be screwed with the threaded section at the front end of the guide cylinder to increase the bonding strength therebetween.
9. The movable valve pin hot runner construction of claim 7, wherein the hardness of the pilot unit cannot be less than the hardness of the shank of the needle valve.
10. The movable valve pin hot runner construction of claim 8, wherein the hardness of the pilot unit cannot be less than the hardness of the shank of the needle valve.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810850195.7A CN110757740A (en) | 2018-07-28 | 2018-07-28 | Movable valve needle hot runner structure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810850195.7A CN110757740A (en) | 2018-07-28 | 2018-07-28 | Movable valve needle hot runner structure |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN110757740A true CN110757740A (en) | 2020-02-07 |
Family
ID=69328825
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810850195.7A Withdrawn CN110757740A (en) | 2018-07-28 | 2018-07-28 | Movable valve needle hot runner structure |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN110757740A (en) |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20090084114A (en) * | 2008-01-31 | 2009-08-05 | 주식회사 삼진엘앤디 | Hot runner system |
| CN201863357U (en) * | 2010-11-17 | 2011-06-15 | 柳道万和(苏州)热流道系统有限公司 | Hot runner system |
| CN106346701A (en) * | 2015-07-17 | 2017-01-25 | 英格拉斯股份公司 | Nozzle terminal for injectors of plastic material injection moulding apparatus |
| CN206796420U (en) * | 2017-03-04 | 2017-12-26 | 昆山准达热流道有限公司 | One kind is incubated wear-resisting Jiao Kou departments |
-
2018
- 2018-07-28 CN CN201810850195.7A patent/CN110757740A/en not_active Withdrawn
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20090084114A (en) * | 2008-01-31 | 2009-08-05 | 주식회사 삼진엘앤디 | Hot runner system |
| CN201863357U (en) * | 2010-11-17 | 2011-06-15 | 柳道万和(苏州)热流道系统有限公司 | Hot runner system |
| CN106346701A (en) * | 2015-07-17 | 2017-01-25 | 英格拉斯股份公司 | Nozzle terminal for injectors of plastic material injection moulding apparatus |
| CN206796420U (en) * | 2017-03-04 | 2017-12-26 | 昆山准达热流道有限公司 | One kind is incubated wear-resisting Jiao Kou departments |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| WW01 | Invention patent application withdrawn after publication | ||
| WW01 | Invention patent application withdrawn after publication |
Application publication date: 20200207 |