CN204640712U - A kind of injection mold - Google Patents
A kind of injection mold Download PDFInfo
- Publication number
- CN204640712U CN204640712U CN201520100855.1U CN201520100855U CN204640712U CN 204640712 U CN204640712 U CN 204640712U CN 201520100855 U CN201520100855 U CN 201520100855U CN 204640712 U CN204640712 U CN 204640712U
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- Prior art keywords
- slide block
- core
- decoration hole
- cover half
- pulling mechanism
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Abstract
The utility model discloses a kind of injection mold, comprise the cover half group and dynamic model group that coordinate up and down, the end face center of dynamic model group is installed with the dynamic mould core for injection molding product cavity, and this dynamic model group is slided and is fitted with large slide block, cover half group, large slide block, dynamic mould core and cover half group match and are configured with the injection moulding die cavity of injecting products; Be compounded with decoration hole core-pulling mechanism in large slide block, in dynamic model group, be provided with sliding block core-pulling mechanism.The utility model structure is reliable, stable movement, closing precision are high, and can meet the need of production of injecting products.
Description
Technical field
The utility model relates to the Design of Dies field of injecting products, specifically a kind of injection mold.
Background technology
Along with improving constantly of quality of the life; people have higher requirement to the outward appearance of its plastic household appliances and structure; some product not only will reach waterproof requirement in life; also to there is the feature can protected user's safety and meet ergonomics; also require that product easily assembles, the difficulty that these characteristics determine the Design of Dies of product improves greatly simultaneously.In prior art, mould is made up of dynamic model, cover half and core-pulling mechanism usually.Dynamic, cover half is after die sinking, core-pulling mechanism completes by hydraulic cylinder action pull-out of being slided from the product of injection mo(u)lding by core action of loosing core, and is then arranged on the stripping action that driven for product framed middle release is completed product by the knock-pin on dynamic model under the promotion of top board.But for some plastic product, the upper and lower side that such as plastic outer surface has flexible glue switch region, trade mark region and permitted lacunary decorative zones and plastic inside also has the plastic product of three buckles respectively, and the loose core mould of pattern of obvious tradition cannot meet precision of plastic and the appearance requirement of this series products.
Summary of the invention
Technical problem to be solved in the utility model is the present situation for above-mentioned prior art, and provides that structure is reliable, stable movement, closing precision are high, and can meet the complicated form of injecting products and to loose core a kind of injection mold of needs.
The utility model solves the problems of the technologies described above adopted technical scheme: a kind of injection mold, comprise the cover half group and dynamic model group that coordinate up and down, the end face center of dynamic model group is installed with the dynamic mould core for injection molding product cavity, and this dynamic model group is slided and is fitted with large slide block, cover half group, large slide block, dynamic mould core and cover half group match and are configured with the injection moulding die cavity of injecting products; Be compounded with decoration hole core-pulling mechanism in large slide block, in dynamic model group, be provided with sliding block core-pulling mechanism.
For optimizing technique scheme, the measure taked also comprises:
Above-mentioned large slide block is made up of left half slide block and right half slide block; The left side of dynamic model group is installed with the left side driving left half slide block to horizontally slip and looses core oil cylinder, and the right side of this dynamic model group is installed with the right side driving right half slide block to horizontally slip and looses core oil cylinder.
Above-mentioned cover half group comprises cover half fixed head and is fixedly mounted on the solid plate on cover half fixed head lower surface, and lock the cover half lock chamber of large slide block when solid plate is shaped with matched moulds, the mating surface that chamber locked by large slide block and cover half is provided with slide block wearing plate.
Above-mentioned cover half group is provided with line position core-pulling mechanism, and upper line position core-pulling mechanism is made up of upper line position slide block and line position guide pad; Cover half fixed head is provided with sprue bushing.
Above-mentioned dynamic model group comprises the rear mold seat board and mould pin that are equipped with mutually and the moving platen be fixedly mounted on dynamic mould fixing plate; The bottom of dynamic mould core is fitted on dynamic mould fixing plate through moving platen location.
The bottom of above-mentioned injection moulding die cavity is provided with slip cap and fits on dynamic mould core for ejecting the push pedal of injecting products from bottom, the ejector retainner plate moved up and down is provided with in the frame-saw space formed between rear mold seat board and mould pin and dynamic mould fixing plate, this ejector retainner plate there are at least two push rods through thimble fixed head location and installation, push rod slides through dynamic mould fixing plate and moving platen and push pedal and is connected to a fixed, and the bottom surface of rear mold seat board is fitted with forces to pull ejector retainner plate to drive the Compulsory reduction mechanism of push pedal reset.
Above-mentioned decoration hole core-pulling mechanism comprises slip and is arranged in the decoration hole slide block of large slide block and the decoration hole shovel for driving decoration hole skid to loose core, be shaped with the sliding chamber of two decoration hole in left half slide block, the decoration hole slide block of two decoration hole core-pulling mechanisms lays respectively in the sliding chamber of corresponding decoration hole.
In two decoration hole core-pulling mechanisms, the direction of motion of loose core direction and left half slide block of a decoration hole core-pulling mechanism is formed with the angle of 58 degree clockwise, correspondingly the direction of motion of loose core direction and left half slide block of another decoration hole core-pulling mechanism is formed with the angle of 58 degree counterclockwise, the angle being formed with 116 degree between direction of loosing core of two decoration hole core-pulling mechanisms.
Above-mentioned sliding block core-pulling mechanism comprises L-shaped lower buckle slide block and promotes lower buckle slide block and to slide the slider waveguide rod of loosing core; The sliding chamber that lower buckle slide block slides is formed between dynamic mould fixing plate and moving platen, slider waveguide rod is fixedly mounted on solid plate, this slider waveguide rod matches with lower buckle slide block through large slide block, lower buckle slide block is shaped with inclined guide groove, and the front end of slider waveguide rod is shaped with stirs lower buckle slide block through inclined guide groove and to slide the Angle Pin of loosing core.
Have in three sliding block core-pulling mechanisms on a sliding block core-pulling mechanism top view and overlap with the direction of motion of left half slide block, in dynamic mould core, be equipped with cooling water channel.
Compared with prior art, Design of Dies of the present utility model is vertically placed in injecting products between cover half group and dynamic model group, the outer surface of whole injecting products forms by large slide block is shaping, large slide block comprises left half slide block and right half slide block, dynamic model group is provided with the oil cylinder of loosing core of hydraulic pressure, drives large slide block movement to realize the shaping of injection product surface switch region and trade mark region by oil cylinder of loosing core.Decoration hole core-pulling mechanism design of the present utility model is on large slide block, coordinated by decoration hole slide block and decoration hole shovel and realize loosing core of injecting products decoration hole, because injecting products appearance decoration hole has Two Areas, therefore in large slide block, be compounded with two decoration hole core-pulling mechanisms.The utility model structure is reliable, stable movement, closing precision are high, and can meet the need of production of injecting products.
Accompanying drawing explanation
Fig. 1 is sectional structure schematic diagram of the present utility model;
Fig. 2 is that dynamic model group of the present utility model and large bowing of slide block see structure diagram;
Fig. 3 is the structural representation of cover half group in Fig. 1;
Fig. 4 is the assembly schematic diagram of the utility model decoration hole core-pulling mechanism and large slide block;
Fig. 5 is the vertical structure schematic diagram of the utility model decoration hole core-pulling mechanism;
Fig. 6 is the structure diagram of line position core-pulling mechanism on the utility model;
Fig. 7 is the structure diagram of the utility model sliding block core-pulling mechanism.
Detailed description of the invention
Below in conjunction with accompanying drawing, embodiment of the present utility model is described in further detail.
Fig. 1 to Fig. 7 is structural representation of the present utility model.
Reference numeral is wherein: injecting products A, loose core oil cylinder B1 in a left side, loose core oil cylinder B2 in the right side, cover half group 1, cover half fixed head 11, solid plate 12, cover half lock chamber 12a, interior inclined-plane 12b, centring ring 13, sprue bushing 14, dynamic model group 2, rear mold seat board 21, mould pin 22, dynamic mould fixing plate 23, moving platen 24, dynamic model wearing plate 25, dynamic mould core 3, large slide block 4, left half slide block 41, right half slide block 42, slide block wearing plate 43, upper line position core-pulling mechanism 5, upper line position slide block 51, line position guide pad 52, decoration hole core-pulling mechanism 6, decoration hole slide block 61, decoration hole shovel 62, sliding block core-pulling mechanism 7, lower buckle slide block 71, slider waveguide rod 72, Angle Pin 73, push pedal 8, ejector retainner plate 81, thimble fixed head 82, Compulsory reduction mechanism 9.
Fig. 1 to Fig. 7 is structural representation of the present utility model, as shown in the figure, a kind of injection mold of the present utility model, comprise the cover half group 1 and dynamic model group 2 that coordinate up and down, the end face center of dynamic model group 2 is longitudinally installed with the dynamic mould core 3 for injection molding product A inner chamber, and this dynamic model group 2 is slided the large slide block 4 being fitted with and forming injecting products A outer surface form, the outer peripheral face of injecting products A has a surface switches region and a trade mark region, when cover half group 1 is shaped with matched moulds and the lug boss of large slide block 4 cover half locking large slide block 4 that is nested lock chamber 12a, the roof of large slide block 4 and dynamic mould core 3 and cover half lock chamber 12a matches and constitutes the injection moulding die cavity of injecting products A, cover half group 1 is provided with the upper line position core-pulling mechanism 5 extending into injection moulding die cavity, be compounded with two decoration hole core-pulling mechanisms 6 for the formation of injecting products A two decoration hole regions in large slide block 4, in dynamic model group 2, be equipped with three sliding block core-pulling mechanisms 7 for injection molding product A intracavity bottom three buckles at a distance of 120 degree.Mould of the present utility model is the mould of certain household appliances plastic housing, and said injecting products A in this plastic housing and the utility model, it is of a size of φ 52mm*171mm, and wall thickness is 3mm, whole product heavily about 66g, and material is ABS.Plastic outer surface by flexible glue switch region, trade mark region and permitted lacunary decorative zones formed, the upper and lower side of plastic inside has three buckles, respectively for being connected and fixed upper and lower covers.The surface requirements of injecting products has only allowed spue line, has not allowed other clamp, and core-pulling mechanism therefore reasonable in design is that the injection moulding of this product is successfully crucial.Due to the particular/special requirement of product appearance, Design of Dies of the present utility model is vertically placed in injecting products between cover half group and dynamic model group, and by the internal cavities of dynamic mould core 3 injection molding product A, the outer surface of whole injecting products A forms by large slide block 4 is shaping, because injecting products appearance decoration hole has Two Areas, therefore the utility model is compounded with two decoration hole core-pulling mechanisms 6 in large slide block 4.Adopt the project organization of this compound core pulling, improve the precision of mould traveling comfort and matched moulds, and Shi Ge mechanism coordinates continuity good, practice shows, mould structure is reliable, and stable movement, precision of plastic and the outward appearance of production meet the requirements.
In embodiment, large slide block 4 of the present utility model can horizontally slip alone by two and collide to be combined to form and be made up of a left side half slide block 41 of a complete longitudinal cavity and right half slide block 42; The chamber wall of longitudinal cavity and the outer wall shape of injecting products A suitable, the left side of dynamic model group 2 is installed with the left side driving left half slide block 41 to horizontally slip and looses core oil cylinder B1, and the right side of this dynamic model group 2 is installed with the right side driving right half slide block 42 to horizontally slip and looses core oil cylinder B2.Large slide block 4 of the present utility model drives large slide block 4 to move by the oil cylinder of loosing core of hydraulic pressure and realizes the shaping of product surface switch region and trade mark region
In embodiment, the solid plate 12 that cover half group 1 comprises cover half fixed head 11 and is fixedly mounted on cover half fixed head 11 lower surface, cover half lock chamber 12a is the fovea superior cavity suitable with the lobe profile of large slide block 4 that solid plate 12 is shaped with, a left left side half lug boss of half slide block 41 and the right side half lug boss of right half slide block 42 all have outer inclined-plane, cover half lock chamber 12a have inclined-plane outer with this Wedge type coordinate in inclined-plane 12b, outer inclined-plane is provided with slide block wearing plate 43, the mating surface that is chamber locked by large slide block and cover half is provided with slide block wearing plate.
In embodiment, upper line position core-pulling mechanism 5 to be arranged on cover half fixed head 11 for the upper line position slide block 51 of buckle in above injection molding product A by upper end hinge and to be shaped with the oblique chute of line position for upper line position slide block 51 and to provide the line position guide pad 52 of slide-and-guide to form; Upper line position slide block 51 tilts to extend in injection moulding die cavity through solid plate 12 and the oblique chute of line position successively; Cover half fixed head 11 fixedly mounts the sprue bushing 14 of promising injection molding chamber injection moulding through centring ring 13.Three interior buckles are had above injecting products A of the present utility model, and have side to be indent, therefore two the interior buckles of the utility model at injecting products A straight wall place shaping on also adopt and have front and back mould to intert the interspersed core-pulling mechanism of depanning mode, this mechanism's the utility model is not shown, upper line position core-pulling mechanism 5 of the present utility model is the interior buckle core-pulling mechanism at recessed side place, therefore goes up line position slide block 51 and can complete the shaping of injecting products A recessed side place inwall curved surface simultaneously.
In embodiment, dynamic model group 2 comprises the rear mold seat board 21 and mould pin 22 that are equipped with mutually and the moving platen 24 be fixedly mounted on dynamic mould fixing plate 23; The bottom of dynamic mould core 3 is fitted on dynamic mould fixing plate 23 through moving platen 24 location, and moving platen 24 is provided with the guide slide into large slide block 4 slide-and-guide, and this moving platen 24 is equipped with dynamic model wearing plate 25.
In embodiment, the bottom of injection moulding die cavity is provided with slip cap and fits on dynamic mould core 3 for ejecting the push pedal 8 of injecting products A from bottom, the ejector retainner plate 81 moved up and down is provided with in the frame-saw space formed between rear mold seat board 21 and mould pin 22 and dynamic mould fixing plate 23, this ejector retainner plate 81 there are at least two push rods through thimble fixed head 82 location and installation, push rod slides through dynamic mould fixing plate 23 and moving platen 24 is connected to a fixed with push pedal 8, and the bottom surface of rear mold seat board 21 is fitted with the Compulsory reduction mechanism 9 forcing to pull ejector retainner plate 81 to drive push pedal 8 to reset.In figure, push rod of the present utility model does not also illustrate, the utility model is equipped with two push rods, and two push rods eject the balance that can ensure push pedal 8 simultaneously.
In embodiment, decoration hole core-pulling mechanism 6 comprises the decoration hole slide block 61 that slides and be arranged in large slide block 4 and for driving decoration hole slide block 61 to slide the decoration hole shovel 62 of loosing core, be shaped with the sliding chamber of two decoration hole in left half slide block 41, the decoration hole slide block 61 of two decoration hole core-pulling mechanisms 6 lays respectively in the sliding chamber of corresponding decoration hole.
In two decoration hole core-pulling mechanisms 6, the direction of motion of loose core direction and left half slide block 41 of a decoration hole core-pulling mechanism 6 is formed with the angle of 58 degree clockwise, correspondingly the direction of motion of loose core direction and left half slide block 41 of another decoration hole core-pulling mechanism 6 is formed with the angle of 58 degree counterclockwise, the angle being formed with 116 degree between direction of loosing core of two decoration hole core-pulling mechanisms 6.Decoration hole shovel 62 is fixed on cover half group 1, decoration hole shovel 62 just can be made automatically to promote the slip of decoration hole slide block 61 like this loose core when die sinking by the motion of dynamic model group 2.
Sliding block core-pulling mechanism 7 of the present utility model comprises L-shaped lower buckle slide block 71 and promotes lower buckle slide block 71 and to slide the slider waveguide rod 72 of loosing core; The sliding chamber that lower buckle slide block 71 slides is formed between dynamic mould fixing plate 23 and moving platen 24, slider waveguide rod 72 is fixedly mounted on solid plate 12, this slider waveguide rod 72 matches with lower buckle slide block 71 through large slide block 4, lower buckle slide block 71 is shaped with inclined guide groove, and the front end of slider waveguide rod 72 is shaped with stirs lower buckle slide block 71 through inclined guide groove and to slide the Angle Pin 73 of loosing core.
Have in three sliding block core-pulling mechanisms 7 on sliding block core-pulling mechanism 7 top view and overlap with the direction of motion of left half slide block 4, in dynamic mould core 3, be equipped with cooling water channel.
The course of work of the present utility model as shown in Figure 1, when during die sinking, the mould opening force of injection machine acts on dynamic model group 2, solid plate 12 and moving platen 24 do die sinking campaign, mould somatotype before and after realizing, first go up the oblique runner movement of line position of line position slide block 51 along line position guide pad 52, complete loosing core of buckle in injecting products A upper end; Along with the increase of opening stroke, solid plate 12 drive the Angle Pin 73 of slider waveguide rod 72 and lower buckle slide block 71 make injecting products A bottom buckle do depanning of loosing core; And now large slide block 4 keeps motionless, when opening stroke strengthens further, now decoration hole shovel 62 drives the moved decoration hole of injecting products A of decoration hole slide block 61 to loose core; After injecting products A upper and lower side all completes action of loosing core, drive left half slide block 41 and right half slide block 42 to realize loosing core of injecting products A switch region and trade mark region respectively with rear left oil cylinder B1 and right oil cylinder B2 of loosing core of loosing core, now complete whole actions of loosing core of injecting products A; Then eject push pedal 8 by ejector retainner plate 81 by push rod, injecting products A is ejected, completes formed product.
The utility model is wanted first push pedal 8 to be resetted by ejector retainner plate 81 by Compulsory reduction mechanism 9 before matched moulds, then makes left half slide block 41 and right half slide block 42 close up reset by oil cylinder of loosing core, then front and back mould matched moulds, completes an injection moulding process.
Claims (10)
1. an injection mold, comprise the cover half group (1) and dynamic model group (2) that coordinate up and down, it is characterized in that: the end face center of described dynamic model group (2) is installed with the dynamic mould core (3) for injection molding product (A) inner chamber, and the upper slip of this dynamic model group (2) is fitted with large slide block (4), described cover half group (1), large slide block (4), dynamic mould core (3) and cover half group (1) match and are configured with the injection moulding die cavity of injecting products (A); Be compounded with decoration hole core-pulling mechanism (6) in described large slide block (4), in described dynamic model group (2), be provided with sliding block core-pulling mechanism (7).
2. a kind of injection mold according to claim 1, is characterized in that: described large slide block (4) is made up of left half slide block (41) and right half slide block (42); The left side of described dynamic model group (2) is installed with the left side driving left half slide block (41) to horizontally slip and looses core oil cylinder (B1), and the right side of this dynamic model group (2) is installed with the right side driving right half slide block (42) to horizontally slip and looses core oil cylinder (B2).
3. a kind of injection mold according to claim 2, it is characterized in that: described cover half group (1) comprises cover half fixed head (11) and is fixedly mounted on the solid plate (12) on cover half fixed head (11) lower surface, lock cover half lock chamber (12a) of large slide block (4) when described solid plate (12) is shaped with matched moulds, the mating surface that chamber (12a) locked by described large slide block (4) and cover half is provided with slide block wearing plate (43).
4. a kind of injection mold according to claim 3, it is characterized in that: described cover half group (1) is provided with line position core-pulling mechanism (5), upper line position core-pulling mechanism (5) is made up of upper line position slide block (51) and line position guide pad (52); Described cover half fixed head (11) is provided with sprue bushing (14).
5. a kind of injection mold according to claim 4, is characterized in that: described dynamic model group (2) comprises the rear mold seat board (21) and mould pin (22) that are equipped with mutually and the moving platen (24) be fixedly mounted on dynamic mould fixing plate (23); The bottom of described dynamic mould core (3) is fitted on dynamic mould fixing plate (23) through moving platen (24) location.
6. a kind of injection mold according to claim 5, it is characterized in that: the bottom of described injection moulding die cavity is provided with slip cap and fits on dynamic mould core (3) for ejecting the push pedal (8) of injecting products (A) from bottom, the ejector retainner plate (81) moved up and down is provided with in the frame-saw space formed between described rear mold seat board (21) and mould pin (22) and dynamic mould fixing plate (23), this ejector retainner plate (81) there are at least two push rods through thimble fixed head (82) location and installation, described push rod slides through dynamic mould fixing plate (23) and moving platen (24) is connected to a fixed with push pedal (8), the bottom surface of described rear mold seat board (21) is fitted with the Compulsory reduction mechanism (9) that pressure pulls ejector retainner plate (81) to drive push pedal (8) to reset.
7. a kind of injection mold according to claim 6, it is characterized in that: described decoration hole core-pulling mechanism (6) comprise slip be arranged in large slide block (4) decoration hole slide block (61) and for driving decoration hole slide block (61) to slide the decoration hole shovel (62) of loosing core, be shaped with the sliding chamber of two decoration hole in a described left side half slide block (41), the decoration hole slide block (61) of two described decoration hole core-pulling mechanisms (6) lays respectively in the sliding chamber of corresponding decoration hole.
8. a kind of injection mold according to claim 7, it is characterized in that: in two described decoration hole core-pulling mechanisms (6), the direction of motion of loose core direction and left half slide block (41) of a decoration hole core-pulling mechanism (6) is formed with the angle of 58 degree clockwise, correspondingly the direction of motion of loose core direction and left half slide block (41) of another decoration hole core-pulling mechanism (6) is formed with the angle of 58 degree counterclockwise, the angle being formed with 116 degree between direction of loosing core of two decoration hole core-pulling mechanisms (6).
9. a kind of injection mold according to claim 8, is characterized in that: described sliding block core-pulling mechanism (7) comprises L-shaped lower buckle slide block (71) and promotes lower buckle slide block (71) and to slide the slider waveguide rod (72) of loosing core; The sliding chamber that lower buckle slide block (71) slides is formed between described dynamic mould fixing plate (23) and moving platen (24), described slider waveguide rod (72) is fixedly mounted on solid plate (12), this slider waveguide rod (72) matches with lower buckle slide block (71) through large slide block (4), described lower buckle slide block (71) is shaped with inclined guide groove, and the front end of described slider waveguide rod (72) is shaped with stirs lower buckle slide block (71) through inclined guide groove and to slide the Angle Pin (73) of loosing core.
10. a kind of injection mold according to claim 9, it is characterized in that: have in the sliding block core-pulling mechanism (7) described in three on sliding block core-pulling mechanism (7) top view and overlap with the direction of motion of left half slide block (4), in described dynamic mould core (3), be equipped with cooling water channel.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520100855.1U CN204640712U (en) | 2015-02-12 | 2015-02-12 | A kind of injection mold |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520100855.1U CN204640712U (en) | 2015-02-12 | 2015-02-12 | A kind of injection mold |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN204640712U true CN204640712U (en) | 2015-09-16 |
Family
ID=54093489
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201520100855.1U Expired - Fee Related CN204640712U (en) | 2015-02-12 | 2015-02-12 | A kind of injection mold |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN204640712U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107336410A (en) * | 2017-08-28 | 2017-11-10 | 昆山嘉华汽车电子科技有限公司 | Injection mold |
| CN110370565A (en) * | 2019-07-23 | 2019-10-25 | 宁波奥克斯电气股份有限公司 | It is a kind of to mix oblique pulling mechanism and injection mold |
-
2015
- 2015-02-12 CN CN201520100855.1U patent/CN204640712U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107336410A (en) * | 2017-08-28 | 2017-11-10 | 昆山嘉华汽车电子科技有限公司 | Injection mold |
| CN110370565A (en) * | 2019-07-23 | 2019-10-25 | 宁波奥克斯电气股份有限公司 | It is a kind of to mix oblique pulling mechanism and injection mold |
| CN110370565B (en) * | 2019-07-23 | 2024-05-10 | 宁波奥克斯电气股份有限公司 | Mix oblique mechanism of taking out and injection mold |
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|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20150916 Termination date: 20170212 |
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| CF01 | Termination of patent right due to non-payment of annual fee |