CN107725814B - Switch controllable joint - Google Patents
Switch controllable joint Download PDFInfo
- Publication number
- CN107725814B CN107725814B CN201711107058.6A CN201711107058A CN107725814B CN 107725814 B CN107725814 B CN 107725814B CN 201711107058 A CN201711107058 A CN 201711107058A CN 107725814 B CN107725814 B CN 107725814B
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- CN
- China
- Prior art keywords
- push rod
- valve
- connecting seat
- periphery
- spring
- 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.)
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K5/00—Plug valves; Taps or cocks comprising only cut-off apparatus having at least one of the sealing faces shaped as a more or less complete surface of a solid of revolution, the opening and closing movement being predominantly rotary
- F16K5/04—Plug valves; Taps or cocks comprising only cut-off apparatus having at least one of the sealing faces shaped as a more or less complete surface of a solid of revolution, the opening and closing movement being predominantly rotary with plugs having cylindrical surfaces; Packings therefor
- F16K5/0407—Plug valves; Taps or cocks comprising only cut-off apparatus having at least one of the sealing faces shaped as a more or less complete surface of a solid of revolution, the opening and closing movement being predominantly rotary with plugs having cylindrical surfaces; Packings therefor with particular plug arrangements, e.g. particular shape or built-in means
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K31/00—Actuating devices; Operating means; Releasing devices
- F16K31/44—Mechanical actuating means
- F16K31/53—Mechanical actuating means with toothed gearing
- F16K31/535—Mechanical actuating means with toothed gearing for rotating valves
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K41/00—Spindle sealings
- F16K41/02—Spindle sealings with stuffing-box ; Sealing rings
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K5/00—Plug valves; Taps or cocks comprising only cut-off apparatus having at least one of the sealing faces shaped as a more or less complete surface of a solid of revolution, the opening and closing movement being predominantly rotary
- F16K5/08—Details
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]
- Y02B30/70—Efficient control or regulation technologies, e.g. for control of refrigerant flow, motor or heating
Abstract
The invention relates to a switch controllable joint, which comprises a valve body, wherein a valve cavity is arranged in the valve body, connecting ports are arranged at the left end and the right end of the valve body, mounting ports are arranged at the upper end and the lower end of the valve body, a limiting ring and a guide rail are arranged in the valve body, a breaking assembly is arranged in the valve cavity, a first baffle ring is arranged at the periphery of a push rod, a first tooth set is arranged at the lower end of the push rod, a first sliding groove is arranged at the periphery of the push rod, a first spring is sleeved at the periphery of the push rod and is abutted between the first baffle ring and the limiting ring, a second tooth set is arranged at the upper end of the push rod, a second sliding groove is arranged at the periphery of the push rod, a second baffle ring is arranged at the periphery of the push rod and is matched with the inner wall of the valve cavity in a blocking manner, the first sliding groove and the second sliding groove are both matched with the guide rail, the push rod is connected with a connecting seat, a notch is arranged at the periphery of the connecting seat and is connected with the valve core, and a second spring is arranged between the valve core and the spring seat. The invention has reasonable structure, easy operation and high speed, and improves the working efficiency.
Description
Technical Field
The invention relates to the technical field of connectors, in particular to a switch controllable connector.
Background
The switch joint is a pipeline accessory for opening and closing a pipeline, controlling the flow direction, adjusting and controlling the parameters of a conveying medium. The switch joint is a control component in the fluid conveying system and has the functions of stopping, adjusting, guiding, preventing countercurrent, stabilizing pressure, shunting or overflow pressure relief and the like. The traditional switch joint is the rotary switch joint, and the rotary switch joint can only be opened or closed by manual control switch joint, can not use automatic small-size cylinder to come rotary joint's switch, and the rotary switch joint on the prior art installs when being close to the wall or installing in narrow and small space moreover, and the hand is gone to rotate the switch and is more inconvenient, opens or closes joint switch slower, has influenced work efficiency.
Disclosure of Invention
Aiming at the defects and shortcomings of the prior art, the invention provides a switch controllable joint, which is provided with a push rod cap, a push rod, a connecting seat, a valve core and a spring seat to form a push type joint switch in a matched manner, the push rod pushes the push rod to rotate to drive the connecting seat to rotate, so that a notch on the connecting seat is aligned with a connecting port, the connecting port is communicated with a cavity, the joint is opened or closed in a narrow space in a switch-pressing manner, the labor is not wasted, the speed is high, the working efficiency is improved, the opening or closing of the joint can be realized by controlling the up-and-down movement of the switch through an automatic small cylinder, and the efficiency is higher.
In order to achieve the above purpose, the present invention adopts the following technical scheme.
The invention discloses a switch controllable joint, which comprises a valve body, wherein a valve cavity is arranged in the valve body, connecting ports communicated with the valve cavity are respectively arranged at the left end and the right end of the valve body, mounting ports are respectively arranged at the upper end and the lower end of the valve body, a limiting ring and a guide rail are sequentially and convexly arranged at the inner side of the mounting ports at the upper end of the valve cavity from top to bottom in the valve body, an opening and closing assembly is arranged in the valve cavity, the opening and closing assembly comprises an ejector rod cap, an ejector rod, a push rod, a connecting seat, a valve core and a spring seat which are sequentially arranged from top to bottom, the ejector rod cap is in plug fit with the middle part of the upper end of the ejector rod, a first baffle ring is convexly arranged at the outer periphery of the upper end of the ejector rod, a first tooth group is arranged at the lower end of the ejector rod, a first sliding groove communicated with the first tooth group is axially arranged at the outer periphery of the ejector rod, a first spring is sleeved at the outer periphery of the ejector rod, the first sliding groove is in the upper end of the valve cavity is in the sliding fit with the first tooth group, a second sliding seat is correspondingly arranged at the lower end of the valve cavity, and the upper end of the valve cavity is in the sliding fit with the lower end of the valve seat, and the valve seat is correspondingly connected with the upper end of the first tooth group, and the valve seat is in the sliding connection port is correspondingly connected with the upper end of the valve cavity, and lower end of the valve seat is in the sliding connection with the first end of the valve seat, and the valve seat is correspondingly connected with the first tooth group; the ejector rod pushes the push rod to move to the lower end of the guide rail to be a critical point, the push rod rotates rightwards along the trend under the pushing of the second spring to drive the connecting seat to rotate, the cavity is communicated with the connecting port through the notch, the ejector rod rebounds upwards under the action of the first spring, the push rod continues to rotate rightwards after passing the critical point, the connecting seat is continuously driven to rotate until the push rod is clamped at the guide rail, at the moment, the cavity is not communicated with the connecting port, and the ejector rod continues to rebound to the top.
Further, the first tooth group and the second tooth group comprise a plurality of convex teeth in annular arrays, the tooth surfaces of the convex teeth are inclined tooth surfaces, and the inclined tooth surfaces incline in the same direction.
Further, the connecting ports at the left end and the right end are respectively provided with a mounting assembly, and each mounting assembly comprises a compression ring, a reed, a zinc sleeve and a button which are sequentially arranged from inside to outside, and the reed is clamped on the inner periphery of the zinc sleeve.
Further, the notch communicates with the top of the connecting seat.
Further, a convex column is arranged in the middle of the upper end of the ejector rod, and the convex column is in plug-in fit with the ejector rod cap.
Further, a sealing ring is embedded on the periphery of the second baffle ring.
Further, sealing rings are arranged between the lower end of the push rod and the connecting seat and between the lower end of the connecting seat and the inner wall of the valve cavity.
The invention has the beneficial effects that: according to the invention, the push rod cap, the push rod, the connecting seat, the valve core and the spring seat are matched to form the push type joint switch, the push rod is pushed by the push rod to rotate to drive the connecting seat to rotate, so that the notch on the connecting seat is aligned with the connecting port, the connecting port is communicated with the cavity, the joint is opened or closed in a narrow space in a mode of pressing the switch, the labor is not wasted, the speed is high, the working efficiency is improved, the opening or closing of the joint can be realized by controlling the up-and-down movement of the switch through an automatic small cylinder, and the efficiency is higher. The working principle of the invention is that the push rod is pushed by the push rod to move to the lower end of the guide rail to be set as a critical point, the push rod rotates rightwards in a clockwise direction under the pushing of the second spring to drive the connecting seat to rotate, so that the cavity is communicated with the connecting port through the notch, the push rod rebounds upwards under the action of the first spring, after the critical point is passed, the push rod continues to rotate rightwards, the connecting seat is continuously driven to rotate until the push rod is clamped at the guide rail, at the moment, the cavity is not communicated with the connecting port, and the push rod continues to rebound to the top. The invention has reasonable structure, easy operation and high speed, and improves the working efficiency.
Drawings
Fig. 1 is a front view of the overall structure of the present invention.
Fig. 2 is a side view of the overall structure of the present invention.
Fig. 3 is a schematic view of a longitudinally exploded construction of the present invention.
Fig. 4 is a schematic view of a laterally exploded construction of the present invention.
In the figure, 1, a valve body; 2. a connection port; 3. a mounting port; 4. a top rod cap; 5. a push rod; 6. a push rod; 7. a connecting seat; 8. a valve core; 9. a spring seat; 10. a first baffle ring; 11. a first set of teeth; 12. a first chute; 13. a first spring; 14. a second set of teeth; 15. a second chute; 16. a second baffle ring; 17. a notch; 18. a second spring; 19. a compression ring; 20. a reed; 21. a zinc sleeve; 22. a button; 23. and (5) a convex column.
Detailed Description
The invention is further described below with reference to the accompanying drawings.
As shown in fig. 1 to 4, the switch controllable joint of the invention comprises a valve body 1, a valve cavity is arranged in the valve body 1, connecting ports 2 communicated with the valve cavity are arranged at the left end and the right end of the valve body 1, mounting ports 3 are arranged at the upper end and the lower end of the valve body 1, a limiting ring and a guide rail are sequentially and convexly arranged at the inner side of the mounting ports 3 at the upper end of the valve cavity in the valve body 1, a breaking assembly is arranged in the valve cavity, the breaking assembly comprises a push rod cap 4, a push rod 5, a push rod 6, a connecting seat 7, a valve core 8 and a spring seat 9 which are sequentially arranged from top to bottom, the push rod cap 4 is in plug fit with the middle part of the upper end of the push rod 5, a first baffle ring 10 is convexly arranged at the outer periphery of the upper end of the push rod 5, a first tooth group 11 is arranged at the lower end of the push rod 5, a first chute 12 communicated with the first tooth group 11 is axially arranged at the outer periphery of the push rod 5, a first spring 13 is sleeved at the outer periphery of the push rod 5, the first spring 13 is propped between the first baffle ring 10 and the limiting ring, the upper end of the push rod 6 is provided with a second tooth group 14 matched with the first tooth group 11, the periphery of the push rod 6 is provided with a second chute 15 communicated with the second tooth group 14, the periphery of the push rod 6 is positioned below the second chute 15 and is convexly provided with a second baffle ring 16 between the lower end of the push rod 6 and the lower end of the push rod 6, the second baffle ring 16 is in plugging fit with the inner wall of the valve cavity, the first chute 12 and the second chute 15 are both in sliding fit with the guide rail, the push rod 5 is in sliding connection with the push rod 6 through the matching of the first tooth group 11 and the second tooth group 14 and the matching of the first chute 12, the second chute 15 and the guide rail, the lower end of the push rod 6 is connected with the middle part of the upper end of a connecting seat 7, the periphery of the connecting seat 7 is provided with two notches 17 communicated with a corresponding connecting port 2, the lower end of the connecting seat 7 is connected with the upper end of the valve core 8, the spring seat 9 is arranged in the mounting port 3 of the valve body 1 positioned at the lower end of the valve cavity, a second spring 18 is propped between the lower end of the valve core 8 and the upper end of the spring seat 9, a cavity is formed among the upper end of the connecting seat 7, the lower end of the second baffle ring 16 and the inner wall of the valve cavity, and the cavity is communicated with the notch 17; set up ejector pin cap 4, ejector pin 5, push rod 6, connecting seat 7, case 8 and spring holder 9 cooperation constitution push type's joint switch, ejector pin 5 promotes the push rod and rotates, drives connecting seat 7 rotation for notch 17 on the connecting seat 7 aligns with connector 2, connector 2 and cavity intercommunication, though open or close the joint through the mode of push switch in narrow and small space, not only hard, and fast, improved work efficiency, and can control opening or closing of joint through the reciprocates of switch of automatic small-size cylinder, efficiency is higher.
The first tooth set 11 and the second tooth set 14 comprise a plurality of convex teeth in annular arrays, the tooth surfaces of the convex teeth are inclined tooth surfaces, the inclined tooth surfaces incline in the same direction, and the arrangement of the inclined angle can drive the push rod 6 to rotate.
The connecting ports 2 at the left end and the right end are respectively provided with a mounting assembly, the mounting assemblies comprise a compression ring 19, a reed 20, a zinc sleeve 21 and a button 22 which are sequentially arranged from inside to outside, the reed 20 is clamped on the inner periphery of the zinc sleeve 21, and the mounting assemblies are convenient to mount; the notch 17 is communicated with the top of the connecting seat 7, and then the notch 17 is communicated with the cavity; the middle part of the upper end of the ejector rod 5 is provided with a convex column 23, and the convex column 23 is in plug-in fit with the ejector rod cap 4; the periphery of the second baffle ring 16 is embedded with a sealing ring, and sealing rings are arranged between the lower end of the push rod 6 and the connecting seat 7 and between the lower end of the connecting seat 7 and the inner wall of the valve cavity to prevent fluid leakage.
The working principle of the invention is that the push rod 5 is pushed by the push rod 6 to move to the lower end of the guide rail to be a critical point, under the pushing of the second spring 18, the push rod 5 is in sliding connection with the push rod 6 through the matching of the first tooth group 11 and the second tooth group 14 and the matching of the first sliding groove 12, the second sliding groove 15 and the guide rail, the push rod 6 rotates rightwards in a clockwise direction to drive the connecting seat 7 to rotate 90 degrees, so that the cavity is communicated with the connecting ports 2 through the notch 17, and the connecting ports 2 on two sides are communicated with each other to open the flow of a pipeline; the ejector rod 5 upwards rebounds under the effect of first spring 13, and after the critical point has been crossed push rod 6 continues to rotate right, continues to drive connecting seat 7 and rotates until push rod 6 card is equivalent to having rotated 90 degrees again in the guide rail department, notch 17 is blocked up with the inner wall of cavity this moment, and the cavity does not communicate with connector 2, and the connector 2 on both sides does not communicate and closes the pipeline flow, and ejector rod 5 continues to rebound to the top.
The foregoing description is only of the preferred embodiments of the invention, and all changes and modifications that come within the meaning and range of equivalency of the structures, features and principles of the invention are therefore intended to be embraced therein.
Claims (4)
1. A controllable joint of switch, characterized by: including valve body (1), be equipped with the valve pocket in valve body (1), both ends all are equipped with connector (2) with the valve pocket intercommunication about valve body (1), the upper and lower both ends of valve body (1) all are equipped with installing port (3), the inboard that is located valve pocket upper end installing port (3) in valve body (1) is from last protruding spacing ring and the guide rail of being equipped with down in proper order, be equipped with in the valve pocket and break the subassembly, it includes ejector pin cap (4) that sets gradually from last to down, ejector pin (5), push rod (6), connecting seat (7), case (8) and spring holder (9), the middle part grafting cooperation of ejector pin cap (4) and ejector pin (5) upper end, the periphery of ejector pin (5) upper end is protruding to be equipped with first baffle ring (10), the lower extreme of ejector pin (5) is equipped with first tooth group (11), the periphery axial of ejector pin (5) is equipped with first spout (12) with first tooth group (11) intercommunication, the periphery cover of ejector pin (5) is equipped with first spring (13), first spring (13) support is located between first baffle ring (10) and the spacing ring in proper order, be equipped with second tooth group (14) with the periphery of first tooth group (14) cooperation on ejector pin (6), the periphery of the push rod (6) is positioned below the second sliding groove (15) and is convexly provided with a second baffle ring (16) between the lower end of the push rod (6), the second baffle ring (16) is matched with the inner wall of the valve cavity in a blocking way, the first sliding groove (12) and the second sliding groove (15) are in sliding fit with the guide rail, the push rod (5) is slidably connected with the push rod (6) through the fit of the first tooth group (11) and the second tooth group (14) and the fit of the first sliding groove (12), the second sliding groove (15) and the guide rail, the lower end of the push rod (6) is connected with the middle part of the upper end of the connecting seat (7), two notches (17) communicated with the corresponding connecting port (2) are formed in the periphery of the connecting seat (7), the lower end of the connecting seat (7) is connected with the upper end of the valve core (8), the spring seat (9) is arranged in the mounting port (3) of the lower end of the valve cavity (1), a second spring (18) is propped between the lower end of the valve core (8) and the upper end of the spring seat (9), the upper end of the connecting seat (7), the second notch (16) is communicated with the inner wall of the valve cavity (17), and the lower end of the valve cavity is communicated with the cavity (17); the push rod (5) pushes the push rod (6) to move to the lower end of the guide rail to serve as a critical point, the push rod (6) rotates rightwards clockwise under the pushing of the second spring (18) to drive the connecting seat (7) to rotate, the cavity is communicated with the connecting port (2) through the notch (17), the push rod (5) rebounds upwards under the action of the first spring (13), after the critical point is passed, the push rod (6) continues to rotate rightwards, the connecting seat (7) is continuously driven to rotate until the push rod (6) is clamped at the guide rail, at the moment, the cavity is not communicated with the connecting port (2), and the push rod (5) continues to rebound to the top;
the first tooth group (11) and the second tooth group (14) comprise a plurality of convex teeth in annular arrays, the tooth surfaces of the convex teeth are inclined tooth surfaces, and the inclined tooth surfaces incline in the same direction; the connecting ports (2) at the left end and the right end are respectively provided with a mounting assembly, the mounting assemblies comprise a compression ring (19), a reed (20), a zinc sleeve (21) and a button (22) which are sequentially arranged from inside to outside, and the reed (20) is clamped on the inner periphery of the zinc sleeve (21); the middle part of the upper end of the ejector rod (5) is provided with a convex column (23), and the convex column (23) is in plug-in fit with the ejector rod cap (4).
2. A switch-controllable joint as claimed in claim 1, wherein: the notch (17) is communicated with the top of the connecting seat (7).
3. A switch-controllable joint as claimed in claim 1, wherein: a sealing ring is embedded on the periphery of the second baffle ring (16).
4. A switch-controllable joint as claimed in claim 1, wherein: sealing rings are arranged between the lower end of the push rod (6) and the connecting seat (7) and between the lower end of the connecting seat (7) and the inner wall of the valve cavity.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711107058.6A CN107725814B (en) | 2017-11-10 | 2017-11-10 | Switch controllable joint |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711107058.6A CN107725814B (en) | 2017-11-10 | 2017-11-10 | Switch controllable joint |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN107725814A CN107725814A (en) | 2018-02-23 |
| CN107725814B true CN107725814B (en) | 2023-07-04 |
Family
ID=61214992
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201711107058.6A Active CN107725814B (en) | 2017-11-10 | 2017-11-10 | Switch controllable joint |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN107725814B (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111734903B (en) * | 2020-05-29 | 2024-03-15 | 红云红河烟草(集团)有限责任公司 | Rubber tube joint with feedback function |
| CN113566120B (en) * | 2021-07-20 | 2022-03-08 | 杭州依技设备成套工程有限公司 | Non-electric pneumatic automatic switching system in medical liquid oxygen station |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2006064865A1 (en) * | 2004-12-15 | 2006-06-22 | Kabushiki Kaisha Saginomiya Seisakusho | Electrically operated control valve |
| CN203926802U (en) * | 2014-04-23 | 2014-11-05 | 宁波以赛亚气动成套有限公司 | Ready-package air control switch valve |
| CN104344129A (en) * | 2014-10-20 | 2015-02-11 | 宁波精艺阀门管件有限公司 | Fast connector for operation under pressure |
| CN205841783U (en) * | 2016-07-18 | 2016-12-28 | 开平市朗盛卫浴有限公司 | A kind of pressing type spool |
| CN106369200A (en) * | 2016-11-03 | 2017-02-01 | 华侨大学 | Gas spring overflow valve |
-
2017
- 2017-11-10 CN CN201711107058.6A patent/CN107725814B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2006064865A1 (en) * | 2004-12-15 | 2006-06-22 | Kabushiki Kaisha Saginomiya Seisakusho | Electrically operated control valve |
| CN203926802U (en) * | 2014-04-23 | 2014-11-05 | 宁波以赛亚气动成套有限公司 | Ready-package air control switch valve |
| CN104344129A (en) * | 2014-10-20 | 2015-02-11 | 宁波精艺阀门管件有限公司 | Fast connector for operation under pressure |
| CN205841783U (en) * | 2016-07-18 | 2016-12-28 | 开平市朗盛卫浴有限公司 | A kind of pressing type spool |
| CN106369200A (en) * | 2016-11-03 | 2017-02-01 | 华侨大学 | Gas spring overflow valve |
Also Published As
| Publication number | Publication date |
|---|---|
| CN107725814A (en) | 2018-02-23 |
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