CN113972510B - Multifunctional connector for temporary grounding wire of transformer substation overhaul test work - Google Patents
Multifunctional connector for temporary grounding wire of transformer substation overhaul test work Download PDFInfo
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- CN113972510B CN113972510B CN202111246917.6A CN202111246917A CN113972510B CN 113972510 B CN113972510 B CN 113972510B CN 202111246917 A CN202111246917 A CN 202111246917A CN 113972510 B CN113972510 B CN 113972510B
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- rod
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- sliding
- shaped part
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
- H01R4/00—Electrically-conductive connections between two or more conductive members in direct contact, i.e. touching one another; Means for effecting or maintaining such contact; Electrically-conductive connections having two or more spaced connecting locations for conductors and using contact members penetrating insulation
- H01R4/28—Clamped connections, spring connections
- H01R4/48—Clamped connections, spring connections utilising a spring, clip, or other resilient member
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
- H01R4/00—Electrically-conductive connections between two or more conductive members in direct contact, i.e. touching one another; Means for effecting or maintaining such contact; Electrically-conductive connections having two or more spaced connecting locations for conductors and using contact members penetrating insulation
- H01R4/58—Electrically-conductive connections between two or more conductive members in direct contact, i.e. touching one another; Means for effecting or maintaining such contact; Electrically-conductive connections having two or more spaced connecting locations for conductors and using contact members penetrating insulation characterised by the form or material of the contacting members
- H01R4/66—Connections with the terrestrial mass, e.g. earth plate, earth pin
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- Electric Cable Installation (AREA)
- Details Of Connecting Devices For Male And Female Coupling (AREA)
Abstract
The application provides a multifunctional connector for a temporary grounding wire of a transformer substation overhaul test work, which comprises a connector body, wherein the connector body is fixedly connected with an insulating rod, a wiring mechanism is arranged on the connector body, the connector body comprises a supporting rod, and a cross rod is arranged at the upper end of the supporting rod; the support rod is provided with a sliding groove communicated with two sides, and a sliding rod is connected in the sliding groove in a sliding way; a screw rod is arranged in the insulating rod; the bottom of the sliding rod is provided with a first connecting hole, a bearing is fixedly arranged in the first connecting hole, and the side wall of the top of the screw rod is fixedly connected with the bearing; one side of the supporting rod is provided with a U-shaped part, the top end of the U-shaped part is fixedly connected with the cross rod, and an elastic clamping piece is arranged in the U-shaped part. The screw rod drives the slide rod to move up and down so that the connecting point can be stably clamped or locked in the connector body, so that the connector body and the connecting point can be firmly and stably connected, the detection is carried with only one temporary grounding device, the connecting relationship is enhanced, the connecting point can be grounded, and the safety of a user is further ensured.
Description
Technical Field
The application relates to the technical field of safety, in particular to a temporary grounding wire multifunctional connector for transformer substation overhaul test work.
Background
Before the equipment or the line is powered off and overhauled, a safety short-circuit device is hung on the transformer substation, and the safety short-circuit device is used for preventing sudden incoming calls from damaging absolute operators or equipment.
The temporary grounding wire is also called a safety loop and mainly comprises a grounding end, a annealed copper wire, an operating rod and a connector, wherein the connector can be divided into a U-shaped hook and a fixing clamp. The temporary grounding wire is installed in the sequence that the grounding end is installed first and then the connector is installed, and the temporary grounding wire is removed in the reverse sequence. When an electrical maintainer overhauls equipment, one end of the temporary grounding wire is connected with the ground, and the other end of the temporary grounding wire is connected with a power-cut conductor. In the power system, a temporary grounding wire adopts 25mm 2 The annealed copper wire is manufactured. Wherein, the detection needs to carry one type of connector of the U-shaped hook or the fixing clamp according to the detection type, which is very inconvenient.
Disclosure of Invention
The present application is directed to solving the above-described problems. An object of the present application is to provide a multifunctional joint for a temporary ground wire for a substation maintenance test work, which solves the above problems, and which can be applied to various types of test joints.
To achieve the purpose, the application adopts the following technical scheme:
the multifunctional connector for the temporary grounding wire of the transformer substation overhaul test comprises a connector body, wherein the connector body is fixedly connected with an insulating rod, a wiring mechanism is arranged on the connector body, the connector body comprises a supporting rod, and a cross rod is arranged at the upper end of the supporting rod; the support rod is provided with a sliding groove communicated with two sides, a sliding rod is connected in the sliding groove in a sliding way, and two ends of the sliding rod extend out of the sliding groove; a screw rod is arranged in the insulating rod, passes through the bottom wall of the chute and is abutted with the slide rod; the bottom of the sliding rod is provided with a first connecting hole, a bearing is fixedly arranged in the first connecting hole, and the side wall of the top of the screw rod is fixedly connected with the inner ring of the bearing; one side of the supporting rod is provided with a U-shaped part, the top end of the U-shaped part is fixedly connected with the cross rod, and an elastic clamping piece is arranged in the U-shaped part.
The preferable technical scheme of the application is that a clamping piece groove is arranged on the inner wall of one side of the U-shaped part far away from the supporting rod; the elastic clamping piece comprises an abutting hook and a first spring, one end of the abutting hook is hinged with one end of the U-shaped part, which is far away from the cross rod, one end of the first spring is fixedly connected with the abutting hook, and the other end of the first spring is fixedly connected with the inner wall of the clamping piece groove; the abutment hook can be fully inserted into the clip groove.
The preferable technical scheme of the application is that the length of the part of the sliding rod, which is close to the U-shaped part and extends out of the sliding groove, is smaller than the opening width of the U-shaped part.
The preferable technical scheme of the application is that a concave part is arranged on one side of the sliding rod close to the U-shaped part.
The preferable technical scheme of the application is that the other side of the supporting rod is a C-shaped part, the C-shaped part is provided with a first groove, and the first groove is positioned at the lower end of the cross rod; an abutting block is connected in a sliding manner in the first groove; a plurality of second springs are arranged in the first groove, one ends of the second springs are fixedly connected with the bottom of the first groove, and the other ends of the second springs are fixedly connected with the upper ends of the abutting blocks.
The preferable technical scheme of the application is that a limiting part is arranged in the first groove; the outer side wall of the upper part of the abutting block radially extends out of the clamping part.
The preferable technical scheme of the application is that the bottom end of the abutting block is provided with anti-skid patterns, the cross sections of the anti-skid patterns are arranged in a plurality of triangles, and the triangles in the anti-skid patterns incline to the direction of the supporting rod.
The preferred technical scheme of the application is that the wiring mechanism comprises a wiring part which is fixedly connected with the support rod; the wiring part is provided with wiring holes communicated with the upper side and the lower side; the inner side wall of the wiring hole is provided with a second groove, and the second groove is connected with an extrusion block in a sliding way; the cross section of the extrusion block is trapezoid, and the inclined plane direction of the extrusion block faces to the lower side opening of the wiring hole; a third spring is arranged between the extrusion block and the second groove.
The preferred technical scheme of the application is that the wiring part is provided with a second connecting hole at the bottom side of the wiring hole; a connecting cylinder is fixedly arranged at one end of the annealed copper wire close to the body; the outer side wall of the end part of the connecting cylinder is in threaded connection with the inner side wall of the second connecting hole.
The beneficial effects of the application are as follows:
the application provides a multifunctional connector for a temporary grounding wire of a transformer substation overhaul test work, which comprises a connector body, wherein the connector body is fixedly connected with an insulating rod, a wiring mechanism is arranged on the connector body, the connector body comprises a supporting rod, and a cross rod is arranged at the upper end of the supporting rod; the support rod is provided with a sliding groove communicated with two sides, a sliding rod is connected in the sliding groove in a sliding way, and two ends of the sliding rod extend out of the sliding groove; a screw rod is arranged in the insulating rod, passes through the bottom wall of the chute and is abutted with the slide rod; the bottom of the sliding rod is provided with a first connecting hole, a bearing is fixedly arranged in the first connecting hole, and the side wall of the top of the screw rod is fixedly connected with the inner ring of the bearing; one side of the supporting rod is provided with a U-shaped part, the top end of the U-shaped part is fixedly connected with the cross rod, and an elastic clamping piece is arranged in the U-shaped part. The screw rod drives the slide rod to move up and down so that the connecting point can be stably clamped or locked in the connector body, so that the connector body and the connecting point can be firmly and stably connected, the detection is carried with only one temporary grounding device, the connecting relationship is enhanced, the connecting point can be grounded, and the safety of a user is further ensured.
Other characteristic features and advantages of the application will become apparent from the following description of exemplary embodiments, which is to be read with reference to the accompanying drawings.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments of the application and together with the description, serve to explain the principles of the application. In the drawings, like reference numerals are used to identify like elements. The drawings, which are included in the description, illustrate some, but not all embodiments of the application. Other figures can be derived from these figures by one of ordinary skill in the art without undue effort.
FIG. 1 is a schematic structural view of a temporary ground wire multifunctional joint for substation maintenance test work;
FIG. 2 is a schematic cross-sectional view of a chute according to the present application;
FIG. 3 is a schematic cross-sectional view of a U-shaped portion of the present application;
FIG. 4 is a schematic cross-sectional view of the extrusion die of the present application;
fig. 5 is a schematic cross-sectional view of the wiring mechanism of the present application.
In the figure: 1. a body; 2. an insulating rod; 3. a support rod; 4. a cross bar; 5. a chute; 6. a slide bar; 7. a screw; 8. a first connection hole; 9. a bearing; 10. a U-shaped part; 11. an elastic clip; 12. a clip groove; 13. an abutment hook; 14. a first spring; 15. a C-shaped part; 16. a first groove; 17. an abutment block; 18. a second spring; 19. a limit part; 20. a clamping part; 21. anti-skid lines; 22. a wiring section; 23. a wiring hole; 24. a second groove; 25. extruding a block; 26. a third spring; 27. a second connection hole; 28. a connecting cylinder; 29. a concave portion.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present application more apparent, the technical solutions of the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application, and it is apparent that the described embodiments are some embodiments of the present application, but not all embodiments of the present application. All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without making any inventive effort, are intended to be within the scope of the application. It should be noted that, without conflict, the embodiments of the present application and features of the embodiments may be arbitrarily combined with each other.
The technical scheme of the application is further described below by combining the drawings and the embodiments.
As shown in fig. 1-5, the embodiment provides a multifunctional connector for a temporary grounding wire for a transformer substation overhaul test, which comprises a connector body 1, wherein the body 1 is fixedly connected with an insulating rod 2, a wiring mechanism is arranged on the body 1, the body 1 comprises a supporting rod 3, and a cross rod 4 is arranged at the upper end of the supporting rod 3; the support rod 3 is provided with a sliding groove 5 communicated with two sides, a sliding rod 6 is connected in the sliding groove 5 in a sliding way, and two ends of the sliding rod 6 extend out of the sliding groove 5; a screw rod 7 is arranged in the insulating rod 2, and the screw rod 7 passes through the bottom wall of the chute 5 and is abutted with the slide rod 6; the bottom of the sliding rod 6 is provided with a first connecting hole 8, a bearing 9 is fixedly arranged in the first connecting hole 8, and the side wall at the top of the screw 7 is fixedly connected with the inner ring of the bearing 9; one side of the supporting rod 3 is provided with a U-shaped part 10, the top end of the U-shaped part 10 is fixedly connected with the cross rod 4, and an elastic clamping piece 11 is arranged in the U-shaped part 10. The screw rod 7 is rotated to control the sliding rod 6 to move up and down, wherein the opening of the U-shaped part 10 is downward, when the connector is in a round shape like an electric wire, the U-shaped part 10 is hooked on the connector, the screw rod 7 is rotated to drive the sliding rod 6 to move upwards and lock the connector in the U-shaped part 10, when the connector is in a flat type like a busbar, the lower side wall of the cross rod 4 at the other side of the U-shaped part 10 is propped against the upper end of the connector, the screw rod 7 is rotated again, and the connector is clamped by the sliding rod 6 and the screw rod 7, so that the connection relationship is realized, and even if the connectors which need to be grounded when different detection points are detected are different, the grounding device of the connector body 1 is only needed to be carried.
Preferably, a clamping piece groove 12 is formed in the inner wall of one side of the U-shaped part 10 away from the supporting rod 3; the elastic clamping piece 11 comprises an abutting hook 13 and a first spring 14, one end of the abutting hook 13 is hinged with one end of the U-shaped part 10 away from the cross rod 4, one end of the first spring 14 is fixedly connected with the abutting hook 13, and the other end of the first spring is fixedly connected with the inner wall of the clamping piece groove 12; the abutment hook 13 can be completely inserted into the clip groove 12. The elastic clamping piece 11 is arranged to strengthen the contact relation between the connector and the body 1, wherein the radian of the hook part of the abutting hook 13 is the same as that of the connector, when the connector is connected, the abutting hook 13 is abutted into the clamping piece groove 12 by the connector, and conversely, the abutting hook 13 can tightly abut against the connector through the first spring 14, so that the contact relation between the body 1 and the connector is strengthened, the connection is more stable, and the stable grounding of current is ensured.
In order for the slide bar 6 to be able to better lock and clamp the connection in the U-shaped section 10, the length of the portion of the slide bar 6 that is adjacent to the U-shaped section 10 and extends beyond the chute 5 is less than the opening width of the U-shaped section 10.
Further, in order to enable the slide bar 6 to adapt to the shape of the connector when the connector is to be blocked, a recess 29 is provided on one side of the slide bar 6 near the U-shaped portion 10.
Preferably, the other side of the supporting rod 3 is provided with a C-shaped part 15, the C-shaped part 15 is provided with a first groove 16, and the first groove 16 is positioned at the lower end of the cross rod 4; an abutting block 17 is connected in a sliding way in the first groove 16; a plurality of second springs 18 are arranged in the first grooves 16, one ends of the second springs 18 are fixedly connected with the bottoms of the first grooves 16, and the other ends of the second springs 18 are fixedly connected with the upper ends of the abutting blocks 17. The abutting block 17 can further ensure that the connecting object is clamped when the connecting object is clamped, and the connection relation between the body 1 and the connecting object is ensured to enable current to be conducted.
Preferably, a limiting part 19 is arranged in the first groove 16; the outer side wall of the upper portion of the abutment block 17 radially extends out of the engagement portion 20. The locking portion 20 is restricted by the stopper 19 to prevent the locking portion from falling out of the body 1.
Further, the bottom end of the abutting block 17 is provided with anti-skid patterns 21, the cross sections of the anti-skid patterns 21 are arranged in a plurality of triangles, and the triangles in the anti-skid patterns are inclined towards the direction of the supporting rod 3. The anti-slip patterns 21 can prevent the connector from moving outwards and slipping out of the body 1, so that the connection relationship disappears, and the grounding failure affects the safety of a user.
Preferably, the wiring mechanism comprises a wiring part 22, and the wiring part 22 is fixedly connected with the support rod 3; the wiring portion 22 is provided with wiring holes 23 communicating the upper and lower sides; the inner side wall of the wiring hole 23 is provided with a second groove 24, and an extrusion block 25 is connected in a sliding way in the second groove 24; the cross section of the extrusion block 25 is trapezoid, and the inclined plane direction of the extrusion block is opened towards the lower side of the wiring hole 23; a third spring 26 is arranged between the pressing block 25 and the second recess 24. In order to strengthen the connection between the body 1 and the annealed copper wire, when the annealed copper wire is installed, the annealed copper wire can pass through the wiring hole 23 from the lower part of the wiring hole 23, and extend out from the upper part of the wiring hole, when the annealed copper wire passes through the wiring hole 23, the annealed copper wire abuts against the inclined surface of the extrusion block 25 to enable the extrusion block to move into the second groove 24, and after the annealed copper wire passes through the wiring hole 23, the extrusion block 25 tightly abuts against the annealed copper wire through the third spring 26 to enable the connection relationship to be more stable.
Further, the wiring portion 22 is provided with a second connection hole 27 at the bottom side of the wiring hole 23; a connecting cylinder 28 is fixedly arranged at one end of the annealed copper wire close to the body 1; the outer side wall of the end portion of the coupling cylinder 28 is screw-coupled with the inner side wall of the second coupling hole 27. The annealed copper wire can be further fixedly connected with the body 1 through the connecting cylinder 28 to ensure the connection relationship, and finally, the connection object can be stably grounded to ensure the safety of users.
The above embodiments are only for illustrating the technical scheme of the present application, not for limiting the same, and the present application is described in detail with reference to the preferred embodiments. It will be understood by those skilled in the art that various modifications and equivalent substitutions may be made to the technical solution of the present application without departing from the spirit and scope of the technical solution of the present application, and the present application is intended to be covered by the scope of the appended claims.
Claims (7)
1. The utility model provides a multi-functional joint of temporary earth connection of transformer substation's maintenance test work, includes joint body (1), body (1) and insulator spindle (2) fixed connection, be provided with wiring mechanism on body (1), its characterized in that:
the body (1) comprises a supporting rod (3), and a cross rod (4) is arranged at the upper end of the supporting rod (3); the support rod (3) is provided with a sliding groove (5) communicated with two sides, a sliding rod (6) is connected in a sliding manner in the sliding groove (5), and two ends of the sliding rod (6) extend out of the sliding groove (5); a screw rod (7) is arranged in the insulating rod (2), and the screw rod (7) passes through the bottom wall of the sliding groove (5) to be in butt joint with the sliding rod (6); the bottom of the sliding rod (6) is provided with a first connecting hole (8), a bearing (9) is fixedly arranged in the first connecting hole (8), and the side wall of the top of the screw rod (7) is fixedly connected with the inner ring of the bearing (9);
a U-shaped part (10) is arranged on one side of the supporting rod (3), the top end of the U-shaped part (10) is fixedly connected with the cross rod (4), and an elastic clamping piece (11) is arranged in the U-shaped part (10);
a clamping piece groove (12) is formed in the inner wall of one side, far away from the supporting rod (3), of the U-shaped part (10);
the elastic clamping piece (11) comprises an abutting hook (13) and a first spring (14), one end of the abutting hook (13) is hinged with one end of the U-shaped part (10) far away from the cross rod (4), one end of the first spring (14) is fixedly connected with the abutting hook (13), and the other end of the first spring is fixedly connected with the inner wall of the clamping piece groove (12); the abutting hook (13) can be completely embedded into the clamping piece groove (12);
the other side of the supporting rod (3) is provided with a C-shaped part (15), the C-shaped part (15) is provided with a first groove (16), and the first groove (16) is positioned at the lower end of the cross rod (4); an abutting block (17) is connected in a sliding manner in the first groove (16); a plurality of second springs (18) are arranged in the first grooves (16), one ends of the second springs (18) are fixedly connected with the bottoms of the first grooves (16), and the other ends of the second springs are fixedly connected with the upper ends of the abutting blocks (17).
2. The substation maintenance test work temporary ground wire multifunctional joint according to claim 1, wherein:
the length of the part of the sliding rod (6) which is close to the U-shaped part (10) and extends out of the sliding groove (5) is smaller than the opening width of the U-shaped part (10).
3. The substation maintenance test work temporary ground wire multifunctional joint according to claim 2, wherein:
a concave part (29) is arranged on one side of the sliding rod (6) close to the U-shaped part (10).
4. The substation maintenance test work temporary ground wire multifunctional joint according to claim 1, wherein:
a limiting part (19) is arranged in the first groove (16); the outer side wall of the upper part of the abutting block (17) radially extends out of the clamping part (20).
5. The substation maintenance test work temporary ground wire multifunctional joint according to claim 1, wherein:
the bottom of the abutting block (17) is provided with anti-skid patterns (21), the cross sections of the anti-skid patterns (21) are arranged in a plurality of triangles, and the triangles in the anti-skid patterns are inclined towards the direction of the supporting rod (3).
6. The substation maintenance test work temporary ground wire multifunctional joint according to claim 1, wherein:
the wiring mechanism comprises a wiring part (22), and the wiring part (22) is fixedly connected with the supporting rod (3); the wiring part (22) is provided with wiring holes (23) communicated with the upper side and the lower side; the inner side wall of the wiring hole (23) is provided with a second groove (24), and an extrusion block (25) is connected in a sliding manner in the second groove (24); the cross section of the extrusion block (25) is trapezoid, and the inclined plane direction of the extrusion block is opened towards the lower side of the wiring hole (23); a third spring (26) is arranged between the extrusion block (25) and the second groove (24).
7. The substation maintenance test work temporary ground wire multifunctional joint according to claim 6, wherein:
the wiring part (22) is provided with a second connecting hole (27) at the bottom side of the wiring hole (23);
a connecting cylinder (28) is fixedly arranged at one end of the annealed copper wire, which is close to the body (1); the outer side wall of the end part of the connecting cylinder (28) is in threaded connection with the inner side wall of the second connecting hole (27).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111246917.6A CN113972510B (en) | 2021-10-26 | 2021-10-26 | Multifunctional connector for temporary grounding wire of transformer substation overhaul test work |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111246917.6A CN113972510B (en) | 2021-10-26 | 2021-10-26 | Multifunctional connector for temporary grounding wire of transformer substation overhaul test work |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN113972510A CN113972510A (en) | 2022-01-25 |
| CN113972510B true CN113972510B (en) | 2023-10-13 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202111246917.6A Active CN113972510B (en) | 2021-10-26 | 2021-10-26 | Multifunctional connector for temporary grounding wire of transformer substation overhaul test work |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN113972510B (en) |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103441353A (en) * | 2013-09-12 | 2013-12-11 | 国家电网公司 | Universal ground lead for 110 kilovolt overhead line strain tower |
| CN210430156U (en) * | 2019-11-18 | 2020-04-28 | 晋普 | Multifunctional joint for temporary grounding wire for overhaul test work of transformer substation |
| CN111952739A (en) * | 2020-08-11 | 2020-11-17 | 国家电网有限公司 | Multifunctional joint for temporary grounding wire for overhaul test work of transformer substation |
| CN213184650U (en) * | 2020-08-04 | 2021-05-11 | 国家电网有限公司 | Multifunctional grounding wire hook |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| AU2015252103B2 (en) * | 2014-11-17 | 2017-05-25 | Thomas & Betts International, Llc | Grounding link for electrical connector mechanism |
-
2021
- 2021-10-26 CN CN202111246917.6A patent/CN113972510B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103441353A (en) * | 2013-09-12 | 2013-12-11 | 国家电网公司 | Universal ground lead for 110 kilovolt overhead line strain tower |
| CN210430156U (en) * | 2019-11-18 | 2020-04-28 | 晋普 | Multifunctional joint for temporary grounding wire for overhaul test work of transformer substation |
| CN213184650U (en) * | 2020-08-04 | 2021-05-11 | 国家电网有限公司 | Multifunctional grounding wire hook |
| CN111952739A (en) * | 2020-08-11 | 2020-11-17 | 国家电网有限公司 | Multifunctional joint for temporary grounding wire for overhaul test work of transformer substation |
Non-Patent Citations (1)
| Title |
|---|
| 一款新型临时接地线的研制;陈仪;;通讯世界(第24期);129-130 * |
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| CN113972510A (en) | 2022-01-25 |
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