CN113241705B - Conductor spacer erector - Google Patents
Conductor spacer erector Download PDFInfo
- Publication number
- CN113241705B CN113241705B CN202110566419.3A CN202110566419A CN113241705B CN 113241705 B CN113241705 B CN 113241705B CN 202110566419 A CN202110566419 A CN 202110566419A CN 113241705 B CN113241705 B CN 113241705B
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- CN
- China
- Prior art keywords
- rod
- sleeve
- fixture
- rod body
- screw
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Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02G—INSTALLATION OF ELECTRIC CABLES OR LINES, OR OF COMBINED OPTICAL AND ELECTRIC CABLES OR LINES
- H02G7/00—Overhead installations of electric lines or cables
- H02G7/12—Devices for maintaining distance between parallel conductors, e.g. spacer
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02G—INSTALLATION OF ELECTRIC CABLES OR LINES, OR OF COMBINED OPTICAL AND ELECTRIC CABLES OR LINES
- H02G1/00—Methods or apparatus specially adapted for installing, maintaining, repairing or dismantling electric cables or lines
- H02G1/02—Methods or apparatus specially adapted for installing, maintaining, repairing or dismantling electric cables or lines for overhead lines or cables
- H02G1/04—Methods or apparatus specially adapted for installing, maintaining, repairing or dismantling electric cables or lines for overhead lines or cables for mounting or stretching
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- Mutual Connection Of Rods And Tubes (AREA)
Abstract
The application discloses conductor spacer erector includes: the rod sleeve, the rod body, the clamp rotation adjuster, the screw rod and the threaded sleeve; the rod body can be arranged in the rod sleeve in a sliding mode; the screw rod is arranged in the rod body and the rod sleeve; the screw sleeve is in threaded connection with the screw rod; the screw sleeve is used for driving the rod body to move along the axial direction of the screw rod when the screw rod rotates; the fixture is rotatably arranged on the rod body; the fixture rotation adjuster is used for driving the fixture to rotate according to the movement of the threaded sleeve. Through setting up swivel nut cooperation screw rod, after the erector passed the construction hole of conductor spacer, the swivel nut was toward being close to the pole body and is removed, thereby fixture rotated the regulator influence by fixture and is blocked the construction hole of conductor spacer for it removes to vertically rotate for fixture can drive the conductor spacer, and then makes the conductor spacer promoted to pressing from both sides tightly between fixture and pole cover, realizes the purpose of installation conductor spacer.
Description
Technical Field
The application relates to the technical field of spacer installation devices, in particular to a spacer installer.
Background
The spacing rod is a tool which is arranged on the split conductors and used for fixing the spacing between the split conductors; the spacer installer is required to install it on the wire. When the existing spacer installer is used, a clamp for clamping the spacer needs to be manually opened, so that a constructor is forced to operate by two hands, and great inconvenience is brought to high-altitude operation personnel.
Disclosure of Invention
In view of this, the present application aims to provide a spacer installer, which is used for solving the problem that the existing spacer installer cannot automatically open the clamp.
To achieve the above technical object, the present application provides a spacer installer, comprising: the rod sleeve, the rod body, the clamp rotation adjuster, the screw rod and the threaded sleeve;
the first end of the rod body is slidably arranged in the rod sleeve, a through hole which is through along the axial direction is formed in the rod body, and a limiting piece is arranged at the second end of the rod body;
the screw rod penetrates through the through hole and is arranged in the rod body and the rod sleeve, the first end of the screw rod extends out of the first end of the rod sleeve, and the second end of the screw rod extends out of the second end of the rod body;
the screw sleeve is in threaded connection with the second end of the screw rod and is connected with the limiting piece;
the limiting piece is used for limiting the rotation of the threaded sleeve;
the screw sleeve is used for driving the rod body to move along the axial direction of the rod sleeve by moving along the axial direction of the screw rod when the screw rod rotates;
the fixture is rotatably arranged at the second end of the rod body;
the fixture rotation adjuster is arranged on the screw sleeve, is connected with the first end of the fixture and is used for enabling the first end of the fixture to rotate in the direction away from the rod body when the screw sleeve moves towards the direction close to the rod body;
the fixture rotation adjuster is further used for enabling the first end of the fixture to rotate towards the direction close to the rod body when the threaded sleeve moves towards the direction far away from the rod body.
Further, the fixture rotation adjuster specifically comprises a torsion spring and a traction rope;
one end of the traction rope is arranged on the screw sleeve, and the other end of the traction rope is connected with the first end of the clamp;
the torsion spring is arranged on a rotating shaft connected with the fixture and the rod body, one end of the torsion spring is connected with the fixture, and the other end of the torsion spring is connected with the rod body.
Furthermore, the limiting part is a connecting column;
the screw sleeve is provided with a threaded cavity and a column hole which are axially arranged;
the screw rod penetrates through the threaded cavity;
the connecting column is arranged in the column hole in a penetrating way.
Furthermore, the second end of the rod sleeve is provided with a clamping plate extending towards the end faces of two sides, and the clamping plate are used for clamping a spacing rod.
Furthermore, a limit bump is arranged at the first end of the rod body;
the side end face of the rod sleeve is provided with a sliding groove for the limiting lug to slide;
the limiting lug is used for limiting the rod body to slide out of the rod sleeve.
Further, the first end of the rod sleeve is connected with the screw rod through a bearing.
Further, the fixture is rotatably connected with the shaft through a bearing.
As can be seen from the above technical solutions, the present application provides a spacer installer, including: the rod sleeve, the rod body, the clamp rotation adjuster, the screw rod and the threaded sleeve; the first end of the rod body is slidably arranged in the rod sleeve, a through hole which is through along the axial direction is arranged in the rod body, and the second end of the rod body is provided with a limiting piece; the screw rod penetrates through the through hole and is arranged in the rod body and the rod sleeve, the first end of the screw rod extends out of the first end of the rod sleeve, and the second end of the screw rod extends out of the second end of the rod body; the screw sleeve is in threaded connection with the second end of the screw rod and is connected with the limiting piece; the limiting piece is used for limiting the rotation of the threaded sleeve; the screw sleeve is used for driving the rod body to move along the axial direction of the rod sleeve by moving along the axial direction of the screw rod when the screw rod rotates; the fixture is rotatably arranged at the second end of the rod body; the fixture rotation adjuster is arranged on the screw sleeve, is connected with the first end of the fixture and is used for enabling the first end of the fixture to rotate in the direction away from the rod body when the screw sleeve moves towards the direction close to the rod body; the fixture rotation adjuster is also used for enabling the first end of the fixture to rotate towards the direction close to the rod body when the threaded sleeve moves towards the direction far away from the rod body.
By arranging the screw sleeve to be matched with the screw rod, when the screw rod rotates, the screw sleeve cannot rotate due to the limitation of the screw sleeve limiting piece, so that the screw sleeve moves along the axial direction of the screw rod, and the rod body is driven to move on the rod sleeve; meanwhile, in the process that the screw sleeve moves towards the rod body, the clamp rotates under the influence of the clamp rotation adjuster, and the first end of the clamp gradually moves away from the rod body, namely the clamp gradually rotates from the longitudinal direction to the transverse direction; therefore, when the spacer installing device is used, the spacer installing device can firstly stretch into the spaced construction holes, then the screw rod is rotated, the clamping device rotates to the construction hole for transversely clamping the spacer, the screw sleeve drives the rod body to slide, so that the clamping device drives the spacer to move, and the spacer moves to the position where the spacer is clamped between the clamping device and the rod sleeve, and the purpose of installing the spacer is achieved. Constructors can cooperate with tools such as an electric drill bit to control the screw rod to rotate, the clamp can automatically rotate to the transverse direction and the longitudinal direction, the whole operation is simple, and the installation efficiency of the spacer is improved.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without inventive exercise.
Fig. 1 is a schematic view of a spacer installer provided in an embodiment of the present application, in a longitudinal state of a jig;
fig. 2 is a schematic view of a spacer installer in an embodiment of the present application in a state where a jig is in a lateral direction;
FIG. 3 is an isometric view of a second end of a shaft of a spacer installer as provided by an embodiment of the present application;
in the figure: 1. a rod sleeve; 11. clamping a plate; 12. a chute; 2. a shaft body; 21. a limiting member; 211. a clamping block; 22. a limiting clamping piece; 23. a limiting bump; 3. a fixture; 4. a fixture rotation adjuster; 41. a torsion spring; 42. a hauling rope; 5. a screw; 6. a threaded sleeve; 61. a threaded cavity; 62. a post hole; 7. the top is connected with a spring; 8. and a bearing.
Detailed Description
The technical solutions of the embodiments of the present application will be described clearly and completely with reference to the accompanying drawings, and it is to be understood that the described embodiments are some, but not all embodiments of the present application. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the scope of protection claimed herein.
In the description of the embodiments of the present application, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate orientations or positional relationships based on orientations or positional relationships shown in the drawings, and are only for convenience of description of the embodiments of the present application and for simplicity of description, but do not indicate or imply that the devices or elements referred to must have specific orientations, be configured in specific orientations, and operate, and thus, should not be construed as limiting the embodiments of the present application. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the embodiments of the present application, it should be noted that the terms "mounted," "connected," and "connected" are used broadly and are defined as, for example, a fixed connection, an exchangeable connection, an integrated connection, a mechanical connection, an electrical connection, a direct connection, an indirect connection through an intermediate medium, and a communication between two elements, unless otherwise explicitly stated or limited. Specific meanings of the above terms in the embodiments of the present application can be understood in specific cases by those of ordinary skill in the art.
The embodiment of the application discloses a spacer installer.
Referring to fig. 1 to 3, in an embodiment of the present application, a spacer mounter includes: the rod sleeve 1, the rod body 2, the fixture 3, the fixture rotation regulator 4, the screw rod 5 and the threaded sleeve 6; a first end of the rod body 2 is slidably arranged in the rod sleeve 1, a through hole (not shown) which is through along the axial direction is arranged in the rod body, and a limiting piece 21 is arranged at a second end of the rod body; the screw rod 5 penetrates through the through hole and is arranged in the rod body 2 and the rod sleeve 1, the first end of the screw rod extends out of the first end of the rod sleeve 1, and the second end of the screw rod extends out of the second end of the rod body 2; the screw sleeve 6 is in threaded connection with the second end of the screw rod 5 and is connected with the limiting piece 21; the limiting member 21 is used for limiting the rotation of the screw sleeve 6.
Specifically, the stopper 21 is used to restrict the rotation of the screw boss 6, and when the screw 5 rotates, the screw boss 6 moves in the axial direction of the screw 5. The position-limiting member 21 may be disposed in various ways, for example, the screw sleeve 6 is disposed in a square column shape, and the position-limiting member 21 is a square column cavity plate extending from the second end of the shaft 2, and the screw sleeve 6 is clamped by the square column cavity plate so as to be unable to rotate.
In the present embodiment, the limiting member 21 is a connecting column; a clamping block 211 for limiting the screw sleeve 6 from sliding out is arranged at the end part of the connecting column; the threaded sleeve 6 is provided with a threaded cavity 61 and a column hole 62 which are arranged along the axial direction; the screw rod 5 is arranged in the thread cavity 61 in a penetrating way; the connecting column is inserted into the column hole 62. The threaded sleeve 6 is limited through the connecting column, so that the threaded sleeve 6 cannot rotate. The connecting column can be provided with a plurality of connecting columns, so that the rotation of the screw sleeve 6 can be limited without limitation.
The screw sleeve 6 is used for driving the rod body 2 to move along the axial direction of the rod sleeve 1 by moving along the axial direction of the screw rod 5 when the screw rod 5 rotates; the fixture 3 is rotatably provided at a second end of the shaft 2.
Specifically, the fixture 3 may be rotated to the longitudinal direction, i.e., to be parallel to and coincident with the shaft 2, or may be rotated to the lateral direction, i.e., to be perpendicular to the shaft 2; the length of the fixture 3 can be set according to actual needs. In this embodiment, fixture 3 sets up to length and is greater than the mode in spacer construction hole aperture for fixture 3 rotates and can pass the construction hole when vertical, thereby rotates and can't pass the construction hole when horizontal and fixture 3 can drive the spacer removal.
The fixture rotation adjuster 4 is arranged on the threaded sleeve 6, connected with the first end of the fixture 3 and used for enabling the first end of the fixture 3 to rotate in the direction away from the rod body 2 when the threaded sleeve 6 moves in the direction close to the rod body 2.
Specifically, when the screw 6 moves in a direction approaching the shaft 2, the jig rotation adjuster 4 rotates the jig 3 from a longitudinal direction coinciding with the shaft 2 to a lateral direction perpendicular to the shaft 2.
The fixture rotation adjuster 4 is also configured to rotate the first end of the fixture 3 in a direction toward the shaft 2 when the screw socket 6 moves in a direction away from the shaft 2.
Specifically, when the screw 6 moves in a direction away from the shaft 2, the jig rotation adjuster 4 rotates the jig 3 from a lateral direction perpendicular to the shaft 2 to a longitudinal direction overlapping the shaft 2.
It should be noted that, there are various ways for the fixture rotation adjuster 4 to drive the fixture 3 to rotate, for example, a rod with toughness may be used, and when the screw sleeve 6 moves towards the direction close to the shaft 2, the rod has a certain toughness but is not compressible, so that the first end of the fixture 3 is pushed to rotate towards the direction away from the shaft 2; similarly, when the screw sleeve 6 moves away from the rod body 2, the rod pulls the first end of the fixture 3 to rotate towards the direction close to the rod body 2.
In this embodiment, the fixture rotation adjuster 4 specifically includes a torsion spring 41 and a traction rope 42; one end of the traction rope 42 is arranged on the threaded sleeve 6, and the other end is connected with the first end of the clamp 3; the torsion spring 41 is arranged on a rotating shaft connecting the fixture 3 and the shaft 2, one end of the torsion spring is connected with the fixture 3, and the other end of the torsion spring is connected with the shaft 2.
Particularly, fixture 3 passes through the bearing rotatable setting on pole body 2, and pole body 2 is provided with and supplies fixture 3 pivoted axis of rotation and spacing fastener 22, and spacing fastener 22 is used for avoiding fixture 3 excessive rotation. The torsion spring 41 is used to automatically rotate the chucking tool 3 to a lateral state perpendicular to the shaft 2 when there is no traction on the chucking tool 3 in a state where the traction rope 42 is relaxed.
Furthermore, a clamping plate 11 extending towards the end faces at both sides is arranged at the second end of the rod sleeve 1, and is used for clamping a spacing rod with the clamping plate 3.
Further, a first end of the shaft 2 is provided with a limit bump 23; the side end face of the rod sleeve 1 is provided with a sliding groove 12 for the limiting lug 23 to slide; the limit bump 23 is used for limiting the rod body 2 from sliding out of the rod sleeve 1.
Further, the device also comprises a butting spring 7; the rod sleeve 1 is internally provided with an installation cavity for the rod body 2 to slide; the top connection spring 7 is arranged in the installation cavity, and two ends of the top connection spring are respectively connected with the rod body 2 and the cavity wall of the installation cavity in an abutting mode.
The top contact spring 7 is used for moving away from the rod body 2 to the back of not contacting with the rod body 2 when the threaded sleeve 6, so that the rod body 2 can be pushed by the top contact spring 7 to move towards the direction of the second end of the rod body, and the rod body 2 is convenient to reset.
Further, the chucking device 3 includes two; accordingly, the jig rotation adjuster 4 also includes 2. The two jigs 3 are symmetrically arranged with respect to the axial direction of the shaft 2.
Further, the first end of the rod cover 1 is connected with the screw 5 through a bearing 8.
Specifically, when the fixture 3 is pulled by the pulling rope 42, the fixture 3 is in a longitudinal state and is overlapped with and parallel to the rod body 2, and at the moment, the rod body 2 and the fixture 3 can penetrate through the construction hole of the spacer. After the erector passed the construction hole, swivel nut 6 was toward being close to 2 directions movements of pole body when rotating screw rod 5, haulage rope 42 limit is lax, fixture 3 plays to horizontal state under torsional spring 41's effect, fixture 3 can't pass the construction hole this moment, continue to rotate screw rod 5 under this state, swivel nut 6 continues to be close to pole body 2, fixture 3 thereby block the conductor spacer and drive the conductor spacer and move to butt cardboard 11, cardboard 11 presss from both sides the conductor spacer with fixture 3, the installation to the conductor spacer is accomplished, overall operation is simple, constructor cooperation electric swivel tool rotate screw rod 5 can, fixture 3 can expand to horizontal thereby realize one-hand operation automatically, improve constructor installation effectiveness.
Although the present invention has been described in detail with reference to the examples, it will be apparent to those skilled in the art that modifications, equivalents, improvements and the like can be made on the technical solutions described in the foregoing examples or on partial technical features of the technical solutions.
Claims (10)
1. A spacer installer, comprising: the rod sleeve, the rod body, the fixture rotation regulator, the screw rod and the threaded sleeve are arranged on the rod body;
the first end of the rod body is slidably arranged in the rod sleeve, a through hole which is through along the axial direction is arranged in the rod body, and the second end of the rod body is provided with a limiting piece;
the screw rod penetrates through the through hole and is arranged in the rod body and the rod sleeve, the first end of the screw rod extends out of the first end of the rod sleeve, and the second end of the screw rod extends out of the second end of the rod body;
the threaded sleeve is in threaded connection with the second end of the screw rod and is connected with the limiting piece;
the limiting piece is used for limiting the rotation of the threaded sleeve;
the screw sleeve is used for driving the rod body to move along the axial direction of the rod sleeve by moving along the axial direction of the screw rod when the screw rod rotates;
the fixture is rotatably arranged at the second end of the rod body;
the fixture rotation adjuster is arranged on the screw sleeve, is connected with the first end of the fixture and is used for enabling the first end of the fixture to rotate in the direction away from the rod body when the screw sleeve moves towards the direction close to the rod body;
the fixture rotation adjuster is further used for enabling the first end of the fixture to rotate towards the direction close to the rod body when the threaded sleeve moves towards the direction far away from the rod body.
2. The spacer installer as claimed in claim 1 wherein the jig rotation adjuster comprises a torsion spring and a pulling rope;
one end of the traction rope is arranged on the screw sleeve, and the other end of the traction rope is connected with the first end of the clamp;
the torsion spring is arranged on a rotating shaft connected with the fixture and the rod body, one end of the torsion spring is connected with the fixture, and the other end of the torsion spring is connected with the rod body.
3. The spacer installer as claimed in claim 1 wherein the limiter is a connection post;
the screw sleeve is provided with a threaded cavity and a column hole which are axially arranged;
the screw rod penetrates through the threaded cavity;
the connecting column is arranged in the column hole in a penetrating mode.
4. The spacer installer as claimed in claim 3 wherein the connecting post end is provided with a stop to limit the screw sleeve from slipping out.
5. A spacer mounter according to claim 1, wherein said second end of said rod sleeve is provided with a chucking plate extending to both side end faces for chucking a spacer with said chucking plate.
6. A spacer installer as defined in claim 1 wherein the first end of the shaft is provided with a stop tab;
the side end face of the rod sleeve is provided with a sliding groove for the limiting lug to slide;
the limiting bump is used for limiting the rod body to slide out of the rod sleeve.
7. A spacer installer as defined in claim 1 wherein the first end of the rod sleeve is connected to the threaded rod by a bearing.
8. A spacer installer as claimed in claim 1 wherein the clip is pivotally connected to the shaft by means of a bearing.
9. The spacer installer as claimed in claim 1 further comprising a butting spring;
an installation cavity for the rod body to slide is formed in the rod sleeve;
the top connection spring is arranged in the installation cavity, and two ends of the top connection spring are respectively abutted against the rod body and the cavity wall of the installation cavity.
10. A spacer installer as defined in claim 1 wherein the fixture comprises two;
the two fixtures are symmetrically arranged with respect to an axial direction of the shaft.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110566419.3A CN113241705B (en) | 2021-05-24 | 2021-05-24 | Conductor spacer erector |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110566419.3A CN113241705B (en) | 2021-05-24 | 2021-05-24 | Conductor spacer erector |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN113241705A CN113241705A (en) | 2021-08-10 |
| CN113241705B true CN113241705B (en) | 2022-06-21 |
Family
ID=77138460
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110566419.3A Active CN113241705B (en) | 2021-05-24 | 2021-05-24 | Conductor spacer erector |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN113241705B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114678823B (en) * | 2022-03-07 | 2024-04-16 | 国网河北省电力有限公司平山县供电分公司 | Spacer safety installation device |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DD260150A1 (en) * | 1987-04-28 | 1988-09-14 | Energiebau Veb | METHOD AND ARRANGEMENT FOR DAMPING CONDUCTIVE HEAVY VIBRATIONS |
| EP0384807A1 (en) * | 1989-02-24 | 1990-08-29 | Manufacture D'appareillage Electrique De Cahors | Process and tool for placing on the soil an overhead electrical line wire-spacer, and spacer therefor |
| CN106329400A (en) * | 2016-11-16 | 2017-01-11 | 国网黑龙江省电力有限公司检修公司 | Fixture for spacers of 500-kilovolt power transmission lines and method for disassembling spacers |
| CN206163993U (en) * | 2016-08-31 | 2017-05-10 | 苏奕辉 | Split conductor conductor spacer quick assembly disassembly instrument |
| CN208596905U (en) * | 2018-08-31 | 2019-03-12 | 国网湖南省电力有限公司 | A kind of super, UHV transmission line space rod dismounting tool |
| CN111181070A (en) * | 2020-03-03 | 2020-05-19 | 广东电网有限责任公司 | Overhead transmission line conductor spacer is with installing and removing instrument |
| CN211743887U (en) * | 2020-03-17 | 2020-10-23 | 国网山东省电力公司东营供电公司 | Sub-conductor spacer installation tool |
-
2021
- 2021-05-24 CN CN202110566419.3A patent/CN113241705B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DD260150A1 (en) * | 1987-04-28 | 1988-09-14 | Energiebau Veb | METHOD AND ARRANGEMENT FOR DAMPING CONDUCTIVE HEAVY VIBRATIONS |
| EP0384807A1 (en) * | 1989-02-24 | 1990-08-29 | Manufacture D'appareillage Electrique De Cahors | Process and tool for placing on the soil an overhead electrical line wire-spacer, and spacer therefor |
| CN206163993U (en) * | 2016-08-31 | 2017-05-10 | 苏奕辉 | Split conductor conductor spacer quick assembly disassembly instrument |
| CN106329400A (en) * | 2016-11-16 | 2017-01-11 | 国网黑龙江省电力有限公司检修公司 | Fixture for spacers of 500-kilovolt power transmission lines and method for disassembling spacers |
| CN208596905U (en) * | 2018-08-31 | 2019-03-12 | 国网湖南省电力有限公司 | A kind of super, UHV transmission line space rod dismounting tool |
| CN111181070A (en) * | 2020-03-03 | 2020-05-19 | 广东电网有限责任公司 | Overhead transmission line conductor spacer is with installing and removing instrument |
| CN211743887U (en) * | 2020-03-17 | 2020-10-23 | 国网山东省电力公司东营供电公司 | Sub-conductor spacer installation tool |
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|---|---|
| CN113241705A (en) | 2021-08-10 |
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