CN108994510B - Welding fixture for automobile rear axle - Google Patents
Welding fixture for automobile rear axle Download PDFInfo
- Publication number
- CN108994510B CN108994510B CN201810991757.XA CN201810991757A CN108994510B CN 108994510 B CN108994510 B CN 108994510B CN 201810991757 A CN201810991757 A CN 201810991757A CN 108994510 B CN108994510 B CN 108994510B
- Authority
- CN
- China
- Prior art keywords
- movable plate
- guide rail
- rear axle
- supporting seat
- top end
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- 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.)
- Expired - Fee Related
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K37/00—Auxiliary devices or processes, not specially adapted to a procedure covered by only one of the preceding main groups
- B23K37/04—Auxiliary devices or processes, not specially adapted to a procedure covered by only one of the preceding main groups for holding or positioning work
- B23K37/0426—Fixtures for other work
- B23K37/0435—Clamps
- B23K37/0443—Jigs
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K37/00—Auxiliary devices or processes, not specially adapted to a procedure covered by only one of the preceding main groups
- B23K37/04—Auxiliary devices or processes, not specially adapted to a procedure covered by only one of the preceding main groups for holding or positioning work
- B23K37/047—Auxiliary devices or processes, not specially adapted to a procedure covered by only one of the preceding main groups for holding or positioning work moving work to adjust its position between soldering, welding or cutting steps
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- Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Automatic Assembly (AREA)
Abstract
The invention discloses a welding fixture for a rear axle of an automobile, which comprises a supporting seat and a movable rod, wherein the movable rod is arranged on one side of the top end of the supporting seat, a first guide rail is arranged in the middle of the top end of the supporting seat, a supporting column is arranged in the middle of the top end of the first guide rail, a support is arranged at the top of the supporting column, the outer surface of the first guide rail is connected with a movable plate in a sliding manner, and a clamping mechanism is arranged at the top of the movable plate and comprises two jig frames, two first fixtures and two second fixtures, and the two jig frames are movably arranged at the top of the movable plate. And the welding efficiency of workers is improved.
Description
Technical Field
The invention relates to a welding fixture, in particular to a welding fixture for an automobile rear axle.
Background
The rear axle is a rear driving shaft component for transmitting the power of the vehicle. It is composed of two half-bridges, and can implement half-bridge differential motion. It is also a device for supporting the wheels and connecting the rear wheels. In the case of a front-axle driven vehicle, the rear axle is only a trailing axle and only plays a role of load bearing.
Common car rear axle is in welding process, and the car rear axle is not fixed, and staff's welding efficiency is low, and needs several personnel to control welded part, and the human cost is higher, and welding process is wasted time and energy, therefore we make the improvement to this, provides a car rear axle welding jig.
Disclosure of Invention
In order to overcome the defects in the prior art, the invention provides a welding clamp for an automobile rear axle.
In order to solve the technical problems, the invention provides the following technical scheme:
the invention relates to a welding clamp for a rear axle of an automobile, which comprises a supporting seat and a welding clamp,
the device comprises a controller, a support seat, a servo motor, a first guide rail, a second guide rail and a movable plate, wherein the controller is arranged on the outer wall of the support seat, a translation mechanism is arranged at the top of the support seat and comprises a movable rod, the first guide rail and the movable plate, the movable rod is arranged on one side of the top end of the support seat, external threads are arranged in the middle of the outer wall of the movable rod, the end part of the movable rod is in transmission connection with an output shaft of the servo motor, the first guide rail is arranged in the middle of the top end of the support seat, a support column is arranged in the middle of the top end of the first guide rail, a support;
arrange the clamping mechanism at fly leaf top in, clamping mechanism includes two tool framves, two first anchor clamps and two second anchor clamps, the top activity of fly leaf is provided with two tool framves, and the surface of two tool frame opposite sides is arranged respectively in to two first anchor clamps, and two tool frame dorsal part's surface all is provided with first connecting rod, and the tip of two first connecting rods is connected with the output pole transmission of a first telescoping cylinder respectively, the middle part of supporting seat top both sides side all is provided with first mount, and the movable rod passes one of them first mount, and the middle part of two first mount opposite sides all alternates and is provided with the second connecting rod, and the both ends of two second connecting rods are provided with second telescoping cylinder and second anchor clamps respectively, and two second anchor clamps all are located between two first mounts.
As a preferred technical scheme of the present invention, the side surfaces of the two first telescopic cylinders are both provided with a second fixed frame, the first telescopic cylinders are fixedly connected with the movable plate through the second fixed frame, and the outer side of the second fixed frame is provided with two triangular reinforcing plates.
As a preferred technical scheme of the invention, the bottom of each of the two jig frames is provided with a sliding block, the bottom of each of the two sliding blocks is slidably provided with two second guide rails, the two second guide rails are arranged on the surface of the top end of the movable plate, and the two sliding blocks are slidably connected with the movable plate through the second guide rails.
As a preferable technical scheme of the invention, the middle part of the bottom end of the movable plate is provided with a sliding groove matched with the first guide rail, the side surface of the movable plate is provided with a threaded through hole, and the width of the first guide rail is greater than that of the second guide rail.
As a preferable technical scheme of the invention, two ends of the first guide rail are respectively provided with a stop block, and the middle part of the top end of the movable plate is provided with a rectangular hole for penetrating through the bracket.
As a preferable technical scheme of the invention, two ends of the movable rod are respectively provided with a first connecting block and a second connecting block, one side of the top end of the second connecting block is fixedly connected with the side surface of the servo motor, and the surfaces of the first connecting block and the second connecting block are fixedly connected with the surface of the supporting seat.
As a preferred technical scheme of the invention, four corners of the bottom end of the supporting seat are respectively provided with a universal wheel, each universal wheel is provided with a foot brake, and the side surface of the supporting seat is provided with a containing chamber.
The invention has the beneficial effects that:
1. the translation mechanism can assist a worker to combine two parts of the automobile rear axle needing to be welded together, the servo motor can drive the movable rod to rotate, the movable rod can drive the external threads to rotate, the external threads can drive the movable plate to move, and the movable plate can slide on the first guide rail, so that the function of driving the part of the automobile rear axle to move is realized, and the worker can combine the two parts needing to be welded together conveniently.
2. First mount and second anchor clamps can grasp the first part of car rear axle, tool frame and first anchor clamps can grasp the second part, wherein the second part can pass first part, after passing, need remove the second part, make the welding position of first part and second part cooperate, first telescoping cylinder and second telescoping cylinder can grasp second part and first part respectively, the centre gripping is efficient, and stable in structure, after grasping two parts of welding car rear axle, not only use manpower sparingly, and the efficiency of staff's welding has been improved.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the principles of the invention and not to limit the invention. In the drawings:
FIG. 1 is a schematic structural view of a welding jig for a rear axle of an automobile according to the present invention;
FIG. 2 is a schematic view of a partial structure of a welding fixture for a rear axle of an automobile according to the present invention;
FIG. 3 is a schematic structural view of a first guide rail of the welding fixture for the rear axle of the automobile;
FIG. 4 is a schematic diagram of a movable plate structure of a welding fixture for a rear axle of an automobile according to the present invention;
fig. 5 is a schematic circuit module diagram of a welding fixture for a rear axle of an automobile.
In the figure: 1. a supporting seat; 2. a controller; 3. a movable rod; 4. an external thread; 5. a servo motor; 6. a first guide rail; 7. a pillar; 8. a support; 9. a movable plate; 10. a jig frame; 11. a first clamp; 12. a first link; 13. a first telescoping cylinder; 14. a first fixing frame; 15. a second link; 16. a second telescoping cylinder; 17. a second clamp; 18. a second fixing frame; 19. a slider; 20. a second guide rail; 21. a chute; 22. a threaded through hole; 23. a stopper; 24. a rectangular hole; 25. a first connection block; 26. a second connecting block; 27. a universal wheel; 28. a receiving chamber.
Detailed Description
The preferred embodiments of the present invention will be described in conjunction with the accompanying drawings, and it will be understood that they are described herein for the purpose of illustration and explanation and not limitation.
Example (b): as shown in fig. 1, fig. 2, fig. 3, fig. 4 and fig. 5, the welding jig for the rear axle of the automobile comprises a supporting seat 1, and further comprises,
the controller 2 is arranged on the outer wall of the supporting seat 1, the top of the supporting seat 1 is provided with a translation mechanism, the translation mechanism comprises a movable rod 3, a first guide rail 6 and a movable plate 9, the movable rod 3 is arranged on one side of the top end of the supporting seat 1, the middle part of the outer wall of the movable rod 3 is provided with an external thread 4, the end part of the movable rod 3 is in transmission connection with an output shaft of a servo motor 5, the first guide rail 6 is arranged in the middle of the top end of the supporting seat 1, the middle part of the top end of the first guide rail 6 is provided with a support 7, the top of the support 7 is provided with a support 8, the outer surface of the first guide rail 6 is in sliding connection with the movable plate 9, the servo motor 5 is electrically connected with an external power supply through the controller 2, two parts of the automobile rear axle needing to be welded can be combined, the external thread 4 can drive the movable plate 9 to move, and the movable plate 9 can slide on the first guide rail 6, so that the function of driving parts of the rear axle of the automobile to move is realized, and the two parts needing to be welded are conveniently combined by a worker;
the clamping mechanism is arranged at the top of the movable plate 9 and comprises two jig frames 10, two first clamps 11 and two second clamps 17, the two jig frames 10 are movably arranged at the top of the movable plate 9, the two first clamps 11 are respectively arranged on the surfaces of the opposite sides of the two jig frames 10, first connecting rods 12 are respectively arranged on the surfaces of the opposite sides of the two jig frames 10, the end parts of the two first connecting rods 12 are respectively in transmission connection with an output rod of a first telescopic cylinder 13, first fixed frames 14 are respectively arranged in the middle parts of the two sides of the top end of the supporting seat 1, the movable rod 3 penetrates through one of the first fixed frames 14, second connecting rods 15 are respectively inserted in the middle parts of the opposite sides of the two first fixed frames 14, second telescopic cylinders 16 and the second clamps 17 are respectively arranged at the two ends of the two second connecting rods 15, the two second clamps 17 are respectively positioned between the two first fixed frames 14, and a first part of the rear axle of the automobile can be clamped through the first fixed frames 14, can grasp second part through tool frame 10 and first anchor clamps 11, wherein the second part can pass first part, after passing, need remove the second part for the welding position of first part and second part cooperatees, can grasp second part and first part respectively through first telescoping cylinder 13 and second telescoping cylinder 16, the centre gripping is efficient, and stable in structure, after grasping two parts of welding car rear axle, not only use manpower sparingly, and improved staff's welded efficiency.
The side surfaces of the two first telescopic cylinders 13 are provided with second fixing frames 18, the first telescopic cylinders 13 are fixedly connected with the movable plate 9 through the second fixing frames 18, the outer sides of the second fixing frames 18 are provided with two triangular reinforcing plates, the first telescopic cylinders 13 can be supported through the second fixing frames 18, the strength of the second fixing frames 18 can be improved through the triangular reinforcing plates, and therefore the service life of the second fixing frames 18 is prolonged.
The bottom of each of the two jig frames 10 is provided with a sliding block 19, the bottom of each of the two sliding blocks 19 is provided with two second guide rails 20 in a sliding manner, the two second guide rails 20 are arranged on the surface of the top end of the movable plate 9, the two sliding blocks 19 are connected with the movable plate 9 in a sliding manner through the second guide rails 20, the two jig frames 10 can move relative to the movable plate 9 through the sliding blocks 19 and the two second guide rails 20, the two second guide rails 20 can operate on two sides of the bottom end of the sliding block 19 respectively, and the sliding blocks 19 are prevented from deflecting.
Wherein, the middle part of fly leaf 9 bottom is provided with and first guide rail 6 assorted spout 21, and threaded through-hole 22 has been seted up to the side of this fly leaf 9, and the width of first guide rail 6 is greater than the width of second guide rail 20, can make fly leaf 9 and first guide rail 6 sliding connection through spout 21, can alternate movable rod 3 into fly leaf 9 through threaded through-hole 22, can improve the stability when fly leaf 9 removes through the great first guide rail 6 of width.
The two ends of the first guide rail 6 are provided with stoppers 23, the middle part of the top end of the movable plate 9 is provided with a rectangular hole 24 for passing through the bracket 8, the movable plate 9 can be prevented from being separated from the first guide rail 6 by the stoppers 23, and the bracket 8 and the pillar 7 can prevent the movable plate 9 from moving when the movable plate 9 slides through the rectangular hole 24.
Wherein, the both ends of movable rod 3 are provided with first connecting block 25 and second connecting block 26 respectively, one side on second connecting block 26 top and servo motor 5's side fixed connection, the surface of first connecting block 25 and second connecting block 26 all is connected with the fixed surface of supporting seat 1, can improve movable rod 3's stability through first connecting block 25 and second connecting block 26, and can be with movable rod 3 and 1 swing joint of supporting seat, and second connecting block 26 can also improve servo motor 5's stability.
Wherein, four turnings of supporting seat 1 bottom all are provided with universal wheel 27, all are provided with the service brake on the universal wheel 27, and the side of supporting seat 1 is provided with storage chamber 28, can make things convenient for the staff to remove supporting seat 1 through universal wheel 27, can make things convenient for inside the staff puts into supporting seat 1 with raw materials or instrument through storage chamber 28, makes things convenient for the staff to use.
When in work, two ends of a first part of the automobile rear axle are respectively opposite to the two second clamps 17, the output rod of the second telescopic cylinder 16 can be extended out through externally connecting high-pressure gas, thereby, the two second clamps 17 are close to each other, the two second clamps 17 can fix the first component, the clamping efficiency is high, the structure is stable, after the clamping is finished, the second part of the rear axle of the automobile can penetrate through the first part, two ends of the second part are respectively opposite to the two first clamps 11, by introducing external high-pressure gas into the first telescopic cylinders 13, the two first telescopic cylinders 13 push the first clamps 11, so that the two first clamps 11 clamp the second component, when the two first clamps 11 move, the first clamps 11 will move along with the jig frame 10, and the slide blocks 19 at the bottom of the jig frame 10 will slide on the second guide rails 20, so that the stability in the clamping process is improved.
After the second part is clamped, the servo motor 5 is controlled to rotate through the controller 2, the servo motor 5 can drive the movable rod 3 to rotate, the model of the controller 2 is TPC8-8TD, the model of the servo motor 5 is HBS57, the movable rod 3 drives the external thread 4 to rotate, the external thread 4 rotates in the threaded through hole 22, so that the movable plate 9 is driven to move, the movable plate 9 can slide on the first guide rail 6, the second part is opposite to the first part in the welding position, and after the second part is opposite to the first part, a worker can start welding, after clamping, the efficiency of automobile rear axle welding is improved, and time and labor are saved.
Finally, it should be noted that: although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that changes may be made in the embodiments and/or equivalents thereof without departing from the spirit and scope of the invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (7)
1. A welding clamp for a rear axle of an automobile comprises a supporting seat (1) and is characterized by also comprising,
a controller (2) arranged on the outer wall of the supporting seat (1), a translation mechanism is arranged at the top of the supporting seat (1), the translation mechanism comprises a movable rod (3), a first guide rail (6) and a movable plate (9), the movable rod (3) is arranged on one side of the top end of the supporting seat (1), the middle part of the outer wall of the movable rod (3) is provided with an external thread (4), the end part of the movable rod (3) is in transmission connection with an output shaft of the servo motor (5), the first guide rail (6) is arranged in the middle of the top end of the support seat (1), a pillar (7) is arranged in the middle of the top end of the first guide rail (6), the top of the pillar (7) is provided with a bracket (8), the outer surface of the first guide rail (6) is connected with a movable plate (9) in a sliding way, the servo motor (5) is electrically connected with an external power supply through the controller (2);
the clamping mechanism is arranged at the top of the movable plate (9) and comprises two jig frames (10), two first clamps (11) and two second clamps (17), the two jig frames (10) are movably arranged at the top of the movable plate (9), the two first clamps (11) are respectively arranged on the surfaces of the opposite sides of the two jig frames (10), first connecting rods (12) are respectively arranged on the surfaces of the opposite sides of the two jig frames (10), the end parts of the two first connecting rods (12) are respectively in transmission connection with an output rod of one first telescopic cylinder (13), first fixing frames (14) are respectively arranged in the middle parts of two side sides of the top end of the supporting seat (1), the movable rod (3) penetrates through one first fixing frame (14), the second connecting rods (15) are respectively inserted in the middle parts of the opposite sides of the two first fixing frames (14), and second telescopic cylinders (16) and the second clamps (17) are respectively arranged at two ends of the two second connecting rods (15), the two second clamps (17) are positioned between the two first fixing frames (14).
2. The welding fixture for the rear axle of the automobile according to claim 1, wherein a second fixing frame (18) is arranged on each side surface of the two first telescopic cylinders (13), the first telescopic cylinders (13) are fixedly connected with the movable plate (9) through the second fixing frames (18), and two triangular reinforcing plates are arranged on the outer sides of the second fixing frames (18).
3. The welding fixture for the rear axle of the automobile according to claim 1, wherein the two jig frames (10) are provided with sliding blocks (19) at the bottoms, the two sliding blocks (19) are provided with two second guide rails (20) at the bottoms in a sliding manner, the two second guide rails (20) are disposed on the surface of the top end of the movable plate (9), and the two sliding blocks (19) are connected with the movable plate (9) in a sliding manner through the second guide rails (20).
4. The welding fixture for the rear axle of the automobile as claimed in claim 3, wherein a sliding groove (21) matched with the first guide rail (6) is formed in the middle of the bottom end of the movable plate (9), a threaded through hole (22) is formed in the side surface of the movable plate (9), and the width of the first guide rail (6) is greater than that of the second guide rail (20).
5. The welding fixture for the rear axle of the automobile according to claim 1, wherein two ends of the first guide rail (6) are provided with stop blocks (23), and a rectangular hole (24) for passing through the bracket (8) is formed in the middle of the top end of the movable plate (9).
6. The welding fixture for the rear axle of the automobile according to claim 1, wherein a first connecting block (25) and a second connecting block (26) are respectively arranged at two ends of the movable rod (3), one side of the top end of the second connecting block (26) is fixedly connected with the side surface of the servo motor (5), and the surfaces of the first connecting block (25) and the second connecting block (26) are fixedly connected with the surface of the supporting seat (1).
7. The welding fixture for the rear axle of the automobile as claimed in claim 1, wherein universal wheels (27) are arranged at four corners of the bottom end of the supporting seat (1), each universal wheel (27) is provided with a foot brake, and a storage chamber (28) is arranged on the side surface of the supporting seat (1).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810991757.XA CN108994510B (en) | 2018-08-29 | 2018-08-29 | Welding fixture for automobile rear axle |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810991757.XA CN108994510B (en) | 2018-08-29 | 2018-08-29 | Welding fixture for automobile rear axle |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN108994510A CN108994510A (en) | 2018-12-14 |
| CN108994510B true CN108994510B (en) | 2020-08-25 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810991757.XA Expired - Fee Related CN108994510B (en) | 2018-08-29 | 2018-08-29 | Welding fixture for automobile rear axle |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN108994510B (en) |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109759767B (en) * | 2019-03-20 | 2020-10-30 | 无锡恒久安泰智能制造有限公司 | Steel structural part welding tool |
| CN110814611B (en) * | 2019-11-12 | 2021-09-14 | 徐州永盛机电有限公司 | Welding fixture for rear axle of three-wheeled electric vehicle |
| CN111531316A (en) * | 2020-06-23 | 2020-08-14 | 德州职业技术学院（德州市技师学院） | Clamp structure for machining automobile rear axle |
| CN112496601B (en) * | 2020-11-12 | 2022-10-11 | 山东恒泰车桥有限公司 | Axle clamp matched with manipulator |
| CN113878297A (en) * | 2021-11-01 | 2022-01-04 | 徐州大泰机电科技有限公司 | Intelligent temperature control welding equipment for automobile rear axle pipe |
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| DE4403109C1 (en) * | 1994-02-02 | 1995-01-19 | Daimler Benz Ag | Method and apparatus for welding sheet-metal parts |
| CN202212731U (en) * | 2011-09-14 | 2012-05-09 | 安徽巨一自动化装备有限公司 | Flexible body-in-white welding fixture |
| CN205733573U (en) * | 2016-05-20 | 2016-11-30 | 重庆延锋江森汽车部件系统有限公司 | Automobile seat frame skeleton is switched fast weld jig |
| CN106181438A (en) * | 2016-08-31 | 2016-12-07 | 山东弘祥机床股份有限公司 | A kind of back axle machining tool |
| CN107953058A (en) * | 2017-12-28 | 2018-04-24 | 合肥小小作为信息科技有限公司 | A kind of automatic clamping tooling of industrial welding |
| CN108311841A (en) * | 2018-01-18 | 2018-07-24 | 安徽猎豹汽车有限公司 | A kind of automotive frame assembly welding tool setup |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20060105126A (en) * | 2005-04-01 | 2006-10-11 | 한국산업기술대학교 | Free flow conveyor type automatic welding apparatus |
| CN106271326B (en) * | 2016-09-23 | 2019-03-22 | 苏州哈工易科机器人有限公司 | A kind of robot welding fixture of decontamination apparatus |
| CN206474849U (en) * | 2017-02-18 | 2017-09-08 | 南昌江铃集团车架有限责任公司 | A kind of floor side member point stationary fixture detent mechanism |
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2018
- 2018-08-29 CN CN201810991757.XA patent/CN108994510B/en not_active Expired - Fee Related
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE4403109C1 (en) * | 1994-02-02 | 1995-01-19 | Daimler Benz Ag | Method and apparatus for welding sheet-metal parts |
| CN202212731U (en) * | 2011-09-14 | 2012-05-09 | 安徽巨一自动化装备有限公司 | Flexible body-in-white welding fixture |
| CN205733573U (en) * | 2016-05-20 | 2016-11-30 | 重庆延锋江森汽车部件系统有限公司 | Automobile seat frame skeleton is switched fast weld jig |
| CN106181438A (en) * | 2016-08-31 | 2016-12-07 | 山东弘祥机床股份有限公司 | A kind of back axle machining tool |
| CN107953058A (en) * | 2017-12-28 | 2018-04-24 | 合肥小小作为信息科技有限公司 | A kind of automatic clamping tooling of industrial welding |
| CN108311841A (en) * | 2018-01-18 | 2018-07-24 | 安徽猎豹汽车有限公司 | A kind of automotive frame assembly welding tool setup |
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| Publication number | Publication date |
|---|---|
| CN108994510A (en) | 2018-12-14 |
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