CN209795994U - Powder packaging machine bag opening closing mechanism and powder packaging machine - Google Patents
Powder packaging machine bag opening closing mechanism and powder packaging machine Download PDFInfo
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- CN209795994U CN209795994U CN201920334358.6U CN201920334358U CN209795994U CN 209795994 U CN209795994 U CN 209795994U CN 201920334358 U CN201920334358 U CN 201920334358U CN 209795994 U CN209795994 U CN 209795994U
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Abstract
the utility model provides a powder packaging machine sack closing mechanism and powder packaging machine belongs to powder medicament packing field. The bag opening closing mechanism of the powder packaging machine comprises a clamping mechanism, two front chucks, two rear chucks and a bag closing telescopic unit. The clamping mechanism is provided with a packaging bag containing space and two clamping ends which are respectively arranged at two sides of the packaging bag containing space and are used for being close to each other in opposite directions. The two front chucks are respectively arranged on the two clamping ends, and the two rear chucks are respectively arranged on the two clamping ends in a sliding manner. The bag closing telescopic unit is used for pushing the two rear chucks to slide away from the two front chucks. When the bag opening closing device is used, after the bag opening of the packaging bag is gradually flattened until the bag opening is closed, the axial elastic assembly can be compressed or stretched by the stretching action after the bag closing and stretching unit is closed, so that the rear side edge of the bag opening of the packaging bag is prevented from being excessively pulled by the rear chuck, and the packaging bag is prevented from being torn. The powder packaging machine adopts the above powder packaging machine bag opening closing mechanism, so that the packaging bag can be prevented from being torn.
Description
Technical Field
The utility model belongs to the technical field of powder medicament packing, more specifically say, relate to a powder packaging machine sack closing mechanism and powder packaging machine.
background
the existing powder medicament is generally packed by a powder packing machine. The work flow of the powder packaging machine is as follows: firstly, opening the mouth of a packaging bag through a bag opening mechanism; then, the packaging bag is filled through a bag filling mechanism, and the bag opening is still opened after the packaging bag is filled; and finally, the conveying mechanism conveys the closed packaging bags into a bag opening sealing mechanism for sealing.
The existing medicament packaging bag is generally manufactured by adhering two packaging layers and then bonding the edges of the two packaging layers, and two closed lines are formed in bonding areas on two sides of the opening of the packaging bag. When the bag opening closing mechanism of the existing powder packaging machine works, the front chuck clamps the front side edge of the bag opening of the packaging bag, the rear chuck clamps the rear side edge of the bag opening of the packaging bag, and then the front chuck and the rear chuck pull the front side edge and the rear side edge of the bag opening back to back, so that the bag opening of the packaging bag is gradually flattened until the bag opening is closed. However, because the opening degree of the bag opening of part of the packaging bags is small, the bag opening can be closed only by pulling the front side and the rear side of the bag opening of the packaging bags by a small distance, and the pulling distance between the front chuck and the rear chuck of the existing bag opening closing mechanism is certain, so that when the packaging bags with small opening degrees face each other, the situation that the packaging bags are torn due to excessive pulling of the front chuck and the rear chuck easily occurs.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a powder packaging machine sack closing mechanism to when solving to have among the prior art to the less wrapping bag of sack opening degree carry out the sack closed, chuck and back chuck tractive are excessive before appearing easily, tear the technical problem that damages the wrapping bag.
In order to achieve the above object, the utility model adopts the following technical scheme: there is provided a powder packing machine bag opening closing mechanism including:
The clamping mechanism is provided with a packaging bag accommodating space and two clamping ends which are respectively arranged at two sides of the packaging bag accommodating space and used for approaching oppositely;
The two front chucks are respectively arranged on the two clamping ends, are oppositely arranged and are used for clamping the front side edge of the mouth of the packaging bag;
The two rear chucks are respectively arranged on the two clamping ends in a sliding manner, are oppositely arranged and are used for clamping the rear side edge of the mouth of the packaging bag; and
And one end of the bag closing telescopic unit is connected with the two front chucks, and the other end of the bag closing telescopic unit is connected with the two rear chucks through an axial elastic assembly and is used for pushing the two rear chucks to be far away from the two front chucks for sliding.
Further, the elastic assembly includes:
The spring is sleeved outside the telescopic end of the bag closing telescopic unit, and one end of the spring is connected with the telescopic end of the bag closing telescopic unit; and
The connecting plate is connected with the two rear chucks, one end of the connecting plate is provided with a sliding hole, the telescopic end of the bag closing telescopic unit is slidably arranged in the sliding hole, and the other end of the spring is connected with the connecting plate.
Furthermore, the number of the springs is two, and the two springs are respectively arranged on two sides of the connecting plate in the axial direction of the telescopic end of the bag closing telescopic unit.
Further, the spring is a compression spring.
furthermore, the connecting plate is provided with a clamping long hole arranged along the clamping direction of the clamping end, the rear chuck is provided with a connecting rod, and one end of the connecting rod penetrates through the clamping long hole and is arranged in a sliding manner along the long shaft of the clamping long hole.
Furthermore, the clamping end is provided with a clamping plate, the front chuck is arranged at one end of the clamping plate, the other end of the clamping plate is provided with a bag closing long hole arranged along the front-back direction, a sliding block arranged in a sliding manner along the long axis direction is arranged in the bag closing long hole, and the rear chuck is arranged on the sliding block.
Furthermore, the clamping end of the front chuck and/or the clamping end of the rear chuck are/is provided with an elastic pad used for being abutted against the packaging bag.
Further, clamping mechanism includes base and two side bearer, two the side bearer connect respectively in the both sides of base, just base and two the side bearer partly surrounds and forms wrapping bag accommodation space, two the clamping end is located two respectively on the side bearer.
Furthermore, a clamping telescopic unit is arranged on the side frame, and a telescopic end of the clamping telescopic unit forms the clamping end.
The utility model provides a powder packaging machine sack closing mechanism's beneficial effect lies in: compared with the prior art, the utility model discloses a powder packaging machine sack closing mechanism, when using, the clamp end through clamping mechanism is close to in opposite directions for the preceding side of two preceding chuck centre gripping wrapping bag sacks, the back side of two back chuck centre gripping wrapping bag sacks. Close a flexible unit and be connected through axial elastic component and two back chucks, close the in-process that the flexible unit extension of bag and promote two back chucks keep away from two preceding chucks, wait until the sack of wrapping bag becomes flat gradually until closed after, the resistance increase of back chuck, the extension action after closing the flexible unit of bag can compress or tensile axial elastic component and then the chuck no longer removes to avoid the excessive back side of tearing the wrapping bag sack of back chuck, avoid tearing the wrapping bag bad.
Another object of the utility model is to provide a powder packaging machine, including above arbitrary powder packaging machine sack closing mechanism.
The utility model provides a powder packaging machine's beneficial effect is the same with powder packaging machine sack closing mechanism's effect, no longer gives unnecessary details here.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for the embodiments or the prior art descriptions will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without inventive labor.
Fig. 1 is a top view of a bag opening closing mechanism of a powder packaging machine provided by an embodiment of the present invention;
FIG. 2 is a cross-sectional view taken at A-A of FIG. 1;
Fig. 3 is a bottom view of the powder packaging machine pocket closure mechanism of fig. 1, with the base not shown.
wherein, in the figures, the respective reference numerals:
1-a clamping mechanism; 11-clamping the telescopic unit; 111-a clamping end; 12-a packaging bag accommodating space; 13-a splint; 131-bag closing long holes; 132-a slider; 14-sideframe; 15-a base; 2-front clamping head; 3-rear clamping head; 4-bag closing and stretching unit; 41-an axially resilient component; 411-a spring; 412-a connecting plate; 413-clamping the elongated hole; 414-connecting rod; 5-an elastic pad; 6-bag mouth of the packaging bag.
Detailed Description
In order to make the technical problem, technical solution and advantageous effects to be solved by the present invention more clearly understood, the following description is given in conjunction with the accompanying drawings and embodiments to illustrate the present invention in further detail. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Referring to fig. 1 to fig. 3, a bag opening closing mechanism of a powder packing machine according to an embodiment of the present invention will now be described. The bag opening closing mechanism of the powder packaging machine comprises a clamping mechanism 1, two front chucks 2, two rear chucks 3 and a bag closing telescopic unit 4.
The clamping mechanism 1 is provided with a packaging bag accommodating space 12 and two clamping ends 111 which are respectively arranged at two sides of the packaging bag accommodating space 12 and are used for approaching in an opposite manner. Two preceding chucks 2 are respectively arranged on two clamping ends 111, and are oppositely arranged and used for clamping the front side edge of the packaging bag opening 6. Two back chucks 3 slide respectively and locate on two clamping end 111 and be used for keeping away from preceding chuck 2 and slide, set up relatively and be used for the back side of centre gripping wrapping bag sack 6. One end of the bag closing telescopic unit 4 is connected with the two front chucks 2, and the other end of the bag closing telescopic unit is connected with the two rear chucks 3 through an axial elastic component 41 and used for pushing the two rear chucks 3 to slide away from the two front chucks 2.
Compared with the prior art, the utility model discloses powder packaging machine sack closing mechanism, when using, the clamp end 111 through clamping mechanism 1 is close to in opposite directions for 2 preceding sides of centre gripping wrapping bag sack 6 of chuck before two, the 3 back sides of centre gripping wrapping bag sack 6 of chuck after two. Close a flexible unit 4 and be connected with two back chucks 3 through axial elastic component 41, close the in-process that bag flexible unit 4 extension and promote two back chucks 3 keep away from two preceding chucks 2, wait until the sack of wrapping bag becomes flat gradually until closed after, the resistance increase of back chuck 3, the extension action after closing bag flexible unit 4 can compress or tensile axial elastic component 41 and back chuck 3 no longer moves, thereby avoid the back side of the excessive pulling wrapping bag sack 6 of back chuck 3, avoid tearing the wrapping bag bad.
Specifically, close bag telescoping unit 4's one end can directly be connected with two preceding chucks 2, also can be connected with preceding chuck 2 through clamping mechanism 1 isotructure, guarantees to close bag telescoping unit 4's one end and preceding chuck 2 relatively fixed to make the extension of closing bag telescoping unit 4 can promote two back chucks 3 and keep away from two preceding chucks 2 and slide. More specifically, the bag closing and stretching unit 4 may employ an air cylinder or a hydraulic cylinder.
Referring to fig. 1 to 3, as an embodiment of the bag opening closing mechanism of the powder packing machine of the present invention, the elastic component includes a spring 411 and a connecting plate 412.
The spring 411 is sleeved outside the telescopic end of the bag closing telescopic unit 4, and one end of the spring is connected with the telescopic end of the bag closing telescopic unit 4. The connecting plate 412 is connected with the two rear chucks 3, one end of the connecting plate is provided with a sliding hole, the telescopic end of the bag closing telescopic unit 4 is slidably arranged in the sliding hole, and the other end of the spring 411 is connected with the connecting plate 412.
specifically, the bag closing and stretching unit 4 adopts an air cylinder, one end of the air cylinder is fixed on the clamping mechanism 1, and the stretching rod at the other end forms a stretching end. The sliding hole at one end of the connecting plate 412 is sleeved on the telescopic end of the bag closing telescopic unit 4, so that the connecting plate 412 can slide along the axial direction of the telescopic end of the bag closing telescopic unit 4. The spring 411 is sleeved at the telescopic end of the bag closing telescopic unit 4, and the two ends of the spring are respectively connected with the connecting plate 412 and the telescopic end of the bag closing telescopic unit 4, so that after the bag opening of the packaging bag is closed, the resistance of the rear chuck 3 is increased, and the extension action after the bag closing telescopic unit 4 can compress or stretch the spring and then the rear chuck 3 does not move any more.
when the bag opening device is used, the two front chucks 2 clamp the front side edge of the bag opening 6, the two rear chucks 3 clamp the rear side edge of the bag opening 6, then the connecting plate 412 is pushed through the extension of the telescopic end of the bag closing telescopic unit 4, then the rear chuck 3 is driven to be far away from the front chuck 2 to slide, the rear side edge of the bag opening 6 is pulled to be far away from the front side edge of the bag opening 6, and the bag opening of the bag is gradually flattened until the bag opening is closed. After the bag opening 6 is closed, the resistance of the rear chuck 3 is increased, the extension action after the telescopic end of the bag closing telescopic unit 4 stretches or compresses the spring, and the front chuck 2 and the rear chuck 3 are respectively clamped on the front side and the rear side of the bag opening 6, and the distance is kept unchanged.
referring to fig. 1 to 2, as an embodiment of the bag opening closing mechanism of the powder packing machine of the present invention, the number of the springs 411 is two, and the two springs 411 are respectively disposed on two sides of the connecting plate 412 in the axial direction of the flexible end of the bag closing and stretching unit 4.
Referring to fig. 1 to 2, as an embodiment of the bag opening closing mechanism of the powder packing machine of the present invention, the spring 411 is a compression spring.
Specifically, the bag closing and stretching unit 4 adopts an air cylinder, one end of the bag closing and stretching unit 4 is fixed on the clamping mechanism 1, and the stretching rod at the other end forms a stretching end. The telescopic end of the bag closing telescopic unit 4 sequentially passes through the first spring 411, the sliding hole of the connecting plate 412 and the second spring 411, one end, far away from the connecting plate 412, of the two springs 411 is fixed with the telescopic end of the bag closing telescopic unit 4, the two springs 411 are tightly pressed on two sides of the connecting plate 412, and therefore the connecting plate 412 can slide in the axial direction of the telescopic end of the bag closing telescopic unit 4.
Referring to fig. 1 to 3, as a specific embodiment of the bag opening closing mechanism of the powder packing machine of the present invention, the connecting plate 412 is provided with a long clamping hole 413 with a long axis along the clamping direction of the clamping end 111, the rear chuck 3 is provided with a connecting rod 414, and one end of the connecting rod 414 is inserted into the long clamping hole 413 and is slidably disposed along the long axis of the long clamping hole 413.
When the clamping ends 111 approach each other, the rear clamp 3 drives the connecting rod 414 to slide along the long axis of the clamping slot 413, so that the connecting plate 412 does not affect the rear clamp 3 to move in the clamping direction to clamp the rear side of the bag opening 6. When the bag closing expansion unit 4 drives the rear chuck 3 to move away from the front chuck 2 through the connecting plate 412, the connecting plate 412 can push the connecting rod 414 through the long clamping hole 413, and further drive the rear chuck 3 to slide away from the front chuck 2. More specifically, the connecting plate 412 is located above the two clamping ends 111, and the connecting rod 414 is fixed at its lower end to the slider 132 and at its upper end inserted into the clamping elongated hole 413.
please refer to fig. 2 together, as a specific implementation manner of the bag opening closing mechanism of the powder packing machine of the present invention, the clamping end 111 is provided with the clamping plate 13, the front chuck 2 is disposed at one end of the clamping plate 13, the other end of the clamping plate 13 is provided with the bag closing slot 131 arranged along the front-back direction, the inside of the bag closing slot 131 is provided with the slider 132 slidably arranged along the long axis direction, and the rear chuck 3 is disposed on the slider 132.
Specifically, two clamping plates 13 are respectively provided on the two clamping ends 111, and the plate surfaces are arranged oppositely. The front chuck 2 is fixed on the inner side of the front end of the clamping plate 13. The two clamping plates 13 are respectively provided with a bag closing long hole 131, and the sliding block 132 in the bag closing long hole 131 slides along the long axis of the bag closing long hole 131, so that the rear chuck 3 on the sliding block 132 can be driven by the bag closing telescopic unit 4 to slide away from the front chuck 2. More specifically, the long hole 131 for bag closing penetrates the clamp plate 13, the rear chuck 3 is located inside the clamp plate 13 and fixed to the slider 132, and the connecting rod 414 is located outside the clamp plate 13 and fixed to the slider 132 at its lower end and inserted into the long hole 413 for clamping.
Referring to fig. 1 to 3, as a specific embodiment of the bag opening closing mechanism of the powder packing machine of the present invention, the clamping end 111 of the front chuck 2 and/or the clamping end 111 of the rear chuck 3 are provided with an elastic pad 5 for abutting against the packing bag. This arrangement prevents the front chuck 2 and/or the rear chuck 3 from pinching the packing bag, and specifically, the elastic pad 5 may be made of a rubber material.
Referring to fig. 1 to 3 together, as a specific embodiment of the bag opening closing mechanism of the powder packing machine of the present invention, the clamping mechanism 1 includes a base 15 and two side frames 14, the two side frames 14 are respectively connected to two sides of the base 15, the base 15 and the two side frames 14 are semi-enclosed to form a bag accommodating space 12, and two clamping ends 111 are respectively disposed on the two side frames 14.
Specifically, the two side frames 14 and the base 15 are U-shaped, and the half-enclosed space forms the bag accommodating space 12. The two clamp ends 111 are respectively provided on the inner sides of the two side frames 14.
Referring to fig. 1 and 3 together, as a specific embodiment of the bag opening closing mechanism of the powder packing machine of the present invention, a clamping unit 11 is disposed on the side frame 14, and a telescopic end of the clamping unit 11 forms a clamping end 111.
specifically, the two side frame 14 mechanisms are respectively provided with a clamping telescopic unit 11, and the telescopic ends of the two opposite clamping telescopic units 11 are relatively close to each other. The two clamping plates 13 are respectively fixed on the telescopic ends of the two clamping telescopic units 11, and the telescopic ends of the two clamping telescopic units 11 are relatively close to each other, so that the front clamping heads 2 on the two clamping plates 13 clamp the front side of the packaging bag opening 6, and the rear clamping heads 3 clamp the rear side of the packaging bag opening 6. The clamping telescopic unit 11 may employ an air cylinder.
Another object of the utility model is to provide a powder packaging machine, powder packaging machine includes above arbitrary powder packaging machine sack closing mechanism.
Compared with the prior art, the utility model discloses powder packaging machine adopts an arbitrary powder packaging machine sack closing mechanism above, when using, is close to in opposite directions through clamping mechanism 1's clamping end 111 for 2 preceding sides of centre gripping wrapping bag sack 6 of chuck before two, the back side of 3 centre gripping wrapping bag sack 6 of chuck after two. Close a flexible unit 4 and be connected with two back chucks 3 through axial elastic component 41, close the in-process that bag flexible unit 4 extension and promote two back chucks 3 keep away from two preceding chucks 2, wait until the sack of wrapping bag becomes flat gradually until closed after, the resistance increase of back chuck 3, the extension action after closing bag flexible unit 4 can compress or tensile axial elastic component 41 and back chuck 3 no longer moves, thereby avoid the back side of the excessive pulling wrapping bag sack 6 of back chuck 3, avoid tearing the wrapping bag bad.
The above description is only exemplary of the present invention and should not be construed as limiting the present invention, and any modifications, equivalents and improvements made within the spirit and principles of the present invention are intended to be included within the scope of the present invention.
Claims (10)
1. A powder packaging machine sack closing mechanism, characterized by, comprising:
The clamping mechanism (1) is provided with a packaging bag accommodating space (12) and two clamping ends (111) which are respectively arranged at two sides of the packaging bag accommodating space (12) and are used for approaching oppositely;
the two front chucks (2) are respectively arranged on the two clamping ends (111), are oppositely arranged and are used for clamping the front side edge of the bag opening (6) of the packaging bag;
The two rear chucks (3) are respectively arranged on the two clamping ends (111) in a sliding manner, are oppositely arranged and are used for clamping the rear side edge of the bag opening (6) of the packaging bag; and
And one end of the bag closing telescopic unit (4) is connected with the two front chucks (2), and the other end of the bag closing telescopic unit is connected with the two rear chucks (3) through an elastic component (41) and is used for pushing the two rear chucks (3) to be far away from the two front chucks (2) to slide.
2. The powder wrapping machine pocket opening closure mechanism of claim 1, wherein: the elastic assembly includes:
The spring (411) is sleeved outside the telescopic end of the bag closing telescopic unit (4), and one end of the spring is connected with the telescopic end of the bag closing telescopic unit (4); and
The connecting plate (412) is connected with the two rear chucks (3), one end of the connecting plate is provided with a sliding hole, the telescopic end of the bag closing telescopic unit (4) penetrates through the sliding hole in a sliding mode, and the other end of the spring (411) is connected with the connecting plate (412).
3. The powder wrapping machine pocket opening closure mechanism of claim 2, wherein: the number of the springs (411) is two, and the two springs (411) are respectively arranged on two sides of the connecting plate (412) in the axial direction of the telescopic end of the bag closing telescopic unit (4).
4. The powder wrapping machine pocket opening closure mechanism of claim 3, wherein: the spring (411) is a compression spring.
5. The powder wrapping machine pocket opening closure mechanism of claim 2, wherein: the connecting plate (412) is provided with a clamping long hole (413) arranged along the clamping direction of the clamping end (111), the rear chuck (3) is provided with a connecting rod (414), and one end of the connecting rod (414) penetrates through the clamping long hole (413) and slides along the long shaft of the clamping long hole (413).
6. The powder wrapping machine pocket opening closing mechanism of any one of claims 1 to 5, wherein: the utility model discloses a bag of clamp, including clamp plate (13), preceding chuck (2), the other end of clamp plate (13) is equipped with the bag slot hole (131) that close that set up along the fore-and-aft direction, close and be equipped with in the bag slot hole (131) along the slider (132) that major axis direction slip set up, back chuck (3) are located on slider (132).
7. the powder wrapping machine pocket opening closing mechanism of any one of claims 1 to 5, wherein: the clamping end (111) of the front chuck (2) and/or the clamping end (111) of the rear chuck (3) are/is provided with an elastic pad (5) which is used for being abutted to the packaging bag.
8. the powder wrapping machine pocket opening closing mechanism of any one of claims 1 to 5, wherein: clamping mechanism (1) includes base (15) and two side bearer (14), two side bearer (14) connect respectively in the both sides of base (15), just base (15) and two side bearer (14) half surround and form wrapping bag accommodation space (12), two clamp end (111) are located two respectively on side bearer (14).
9. The powder wrapping machine pocket opening closure mechanism of claim 8, wherein: and a clamping telescopic unit (11) is arranged on the side frame (14), and a telescopic end of the clamping telescopic unit (11) forms the clamping end (111).
10. A powder packaging machine comprising a powder packaging machine pocket opening closing mechanism as claimed in any one of claims 1 to 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920334358.6U CN209795994U (en) | 2019-03-15 | 2019-03-15 | Powder packaging machine bag opening closing mechanism and powder packaging machine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920334358.6U CN209795994U (en) | 2019-03-15 | 2019-03-15 | Powder packaging machine bag opening closing mechanism and powder packaging machine |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN209795994U true CN209795994U (en) | 2019-12-17 |
Family
ID=68824960
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201920334358.6U Expired - Fee Related CN209795994U (en) | 2019-03-15 | 2019-03-15 | Powder packaging machine bag opening closing mechanism and powder packaging machine |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN209795994U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115158785A (en) * | 2021-04-01 | 2022-10-11 | 常州江苏大学工程技术研究院 | Fresh-keeping bag heat-sealing device with stable bag clamping function and heat-sealing mode |
-
2019
- 2019-03-15 CN CN201920334358.6U patent/CN209795994U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115158785A (en) * | 2021-04-01 | 2022-10-11 | 常州江苏大学工程技术研究院 | Fresh-keeping bag heat-sealing device with stable bag clamping function and heat-sealing mode |
| CN115158785B (en) * | 2021-04-01 | 2024-02-02 | 常州江苏大学工程技术研究院 | Bag clamping stable fresh-keeping bag heat sealing device and heat sealing mode |
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| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20191217 |
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| CF01 | Termination of patent right due to non-payment of annual fee |