CN109494668B - Conductor spacer - Google Patents
Conductor spacer Download PDFInfo
- Publication number
- CN109494668B CN109494668B CN201811639746.1A CN201811639746A CN109494668B CN 109494668 B CN109494668 B CN 109494668B CN 201811639746 A CN201811639746 A CN 201811639746A CN 109494668 B CN109494668 B CN 109494668B
- Authority
- CN
- China
- Prior art keywords
- connecting rod
- supporting block
- outer side
- sleeve
- clamping
- 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
-
- 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
-
- 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
- H02G7/125—Damping spacers
Abstract
The invention provides a conductor spacer, which belongs to the technical field of electric tools and comprises a supporting block, a connecting rod, a clamping head and a clamping sleeve; the connecting rods are arranged on the outer side surfaces of the supporting blocks respectively, and are hinged with the supporting blocks; the invention provides a conductor spacer, which is characterized in that a clamping sleeve is sleeved on the outer side surface of a supporting block and is opposite to each connecting rod, a worker can rotate each connecting rod and the clamping sleeve towards the outer side surface of the supporting block and attach the connecting rod and the clamping sleeve to the outer side surface of the supporting block, and the connecting rods and the clamping sleeve are fixed on the supporting block by using the clamping sleeve.
Description
Technical Field
The invention belongs to the technical field of electric tools, and particularly relates to a wire spacer.
Background
When the transmission line wires of the power system are long, sagging can be generated, under severe weather conditions such as strong wind, heavy rain or snow burst, larger galloping can be generated, the damage caused by galloping is light, such as flashover and tripping of a light person, damage of hardware fittings and insulators, wire breakage, loosening and falling of pole tower bolts and the like, and serious power transmission accidents are caused, so that a spacer is usually used between the transmission line wires, the existing spacer is large in appearance of the whole spacer for spacing the transmission line wires, and the spacer with the structure is not easy to carry, especially for the work of arranging the spacer on a high-altitude transmission line. The staff is inconvenient to carry the spacer with a larger shape to climb on a telegraph pole or a power transmission tower.
Disclosure of Invention
The invention aims to provide a wire spacer to solve the technical problems of large appearance and difficult carrying of the spacer in the prior art.
In order to achieve the above purpose, the invention adopts the following technical scheme: there is provided a wire spacer comprising:
a support block;
the plurality of connecting rods are respectively arranged on the outer side surfaces of the supporting blocks and are hinged with the supporting blocks;
the clamping connector is arranged at one end of the connecting rod, which is far away from the supporting block, and is used for clamping the lead;
the clamping sleeve is sleeved on the outer side face of the supporting block and is in sliding fit with the outer side face of the supporting block; the cutting sleeve is arranged opposite to each connecting rod and used for fixing each connecting rod.
Further, a plurality of first mounting grooves which are in one-to-one correspondence with the connecting rods are formed in the outer side face of the supporting block, and the connecting rods are hinged with the inner walls of the first mounting grooves; the outer side surface of the supporting block is also provided with a plurality of containing grooves which are communicated with the first mounting grooves and are used for mounting the connecting rods and the clamping joints.
Further, the ferrule includes:
the sleeve is sleeved on the outer side surface of the supporting block;
the sliding protrusions are uniformly distributed on the inner wall of the sleeve, and the length direction of the sliding protrusions is the same as the length direction of the axis of the sleeve;
the outer side surface of the supporting block is provided with sliding grooves which are in one-to-one correspondence with the sliding protrusions and are in sliding fit with the sliding protrusions;
each sliding groove is positioned between each connecting rod.
Further, the outer side surface of each connecting rod is provided with an arc-shaped groove which is matched with the outer wall of the sleeve.
Further, the clamping connector is made of elastic materials, a mounting hole for mounting and guiding is formed in the clamping connector, and a strip opening communicated with the mounting hole is formed in one side of the clamping connector.
Further, the cross-sectional shape of the strip opening is an inverted cone.
Further, the bayonet joint includes:
the number of the blocks is two, and the blocks are oppositely arranged at one end of the connecting rod far away from the supporting block;
the grooves are arranged on the opposite side surfaces of the two blocks; the two grooves are butted to form the mounting hole;
the notch is arranged on the opposite side surfaces of the two blocks and is positioned above the groove, and the two notches are butted to form the strip opening.
Further, the two blocks are respectively connected with the connecting rod through an elastic body.
Further, one end of the supporting block, which is far away from the connecting rod, is provided with a handle for holding the conductor spacer by a worker.
Further, the outer side face of the supporting block is provided with a plurality of protruding portions corresponding to the connecting rods one by one, and each protruding portion is provided with a second mounting groove hinged to the connecting rod.
The conductor spacer provided by the invention has the beneficial effects that: compared with the prior art, before climbing operation, staff can rotate each connecting rod and each clamping head towards the outer side face of the supporting block and attach the connecting rods and the clamping heads to the outer side face of the supporting block, and the clamping sleeves are used for fixing each connecting rod and the clamping heads to the supporting block.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are needed in the embodiments or the description of 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 invention, and that other drawings can be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a front view of a wire spacer according to an embodiment of the present invention;
FIG. 2 is an enlarged view of FIG. 1 at A;
FIG. 3 is an enlarged view at B in FIG. 1;
fig. 4 is a top view of a wire spacer according to an embodiment of the present invention;
FIG. 5 is a schematic diagram of a connecting rod and a supporting block according to an embodiment of the present invention;
fig. 6 is a schematic diagram II of a connecting rod and a supporting block according to an embodiment of the present invention
Fig. 7 is a schematic view of a use state of a conductor spacer according to an embodiment of the present invention.
Wherein, each reference sign in the figure:
1-a supporting block; 11-a first mounting groove; 12-a receiving groove; 13-a sliding groove; 2-connecting rods; 21-an arc-shaped groove; 3-clamping joints; 31-mounting holes; 32-strip openings; 33-block; 331-groove; 332-notch; 34-an elastomer; 4-cutting ferrule; 41-sleeve; 42-sliding protrusions; 43-handle; 5-conducting wires.
Detailed Description
In order to make the technical problems, technical schemes and beneficial effects to be solved more clear, the invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention.
Referring to fig. 1 to 4 and 7, a wire spacer provided by the present invention will now be described. A conductor spacer comprises a supporting block 1, a connecting rod 2, a clamping head 3 and a clamping sleeve 4; the number of the connecting rods 2 is multiple, and the connecting rods are respectively arranged on the outer side surfaces of the supporting blocks 1 and are hinged with the supporting blocks 1; the clamping connector 3 is arranged at one end of the connecting rod 2 far away from the supporting block 1 and is used for clamping the lead 5; the clamping sleeve 4 is sleeved on the outer side surface of the supporting block 1 and is in sliding fit with the outer side surface of the supporting block 1; the cutting ferrule 4 is arranged opposite to each connecting rod 2 and is used for fixing each connecting rod 2.
Compared with the prior art, before climbing operation, a worker can rotate each connecting rod 2 and each clamping head 3 towards the outer side face of the supporting block 1 and attach the connecting rods 2 and the clamping heads 3 to the outer side face of the supporting block 1, and the clamping sleeves 4 are used for fixing each connecting rod 2 and each clamping head 3 on the supporting block 1.
An anti-slip adhesive layer can be arranged in the clamping connector 3, so that the connection between the clamping connector 3 and the lead 5 is smoother. The storage cavity is formed in the supporting block 1, and a plurality of clamping connectors 3 are arranged in the storage cavity, so that the storage cavity is convenient to replace.
Referring to fig. 1, 3 and 7, as a specific embodiment of the conductor spacer provided by the present invention, a plurality of first mounting grooves 11 corresponding to the connecting rods 2 one by one are provided on the outer side surface of the supporting block 1, and each connecting rod 2 is hinged to the inner wall of each first mounting groove 11; the outer side surface of the supporting block 1 is also provided with a plurality of containing grooves 12 which are communicated with the first installing grooves 11 and are used for installing the connecting rods 2 and the clamping joints 3, the plurality of first installing grooves 11 are arranged, one ends of the connecting rods 2 are arranged in the first installing grooves 11 and are hinged with the inner walls of the first installing grooves 11, the containing grooves 12 which are communicated with the first installing grooves 11 are arranged, when the connecting rods 2 rotate towards the outer side surface of the supporting block 1, the connecting rods 2 and the clamping joints 3 are arranged in the containing grooves 12, and then the connecting rods 2 and the clamping joints 3 are sleeved by the clamping sleeves 4, so that the connecting rods 2 and the clamping joints 3 are prevented from falling out. The depth of the accommodating groove 12 is larger than the thicknesses of the connecting rod 2 and the clamping connector 3, the volume of the whole conductor spacer is further reduced, and when a worker carries the conductor spacer, the worker can hold the supporting block 1. The first mounting groove 11 is provided with a structure for fixing the connecting rod 2 on the inner wall far away from the accommodating groove 12, the connecting rod 2 is fixed through the structure when the connecting rod 2 rotates to a vertical state, the connecting rod 2 is prevented from rotating randomly, and the structure can adopt magnets or clamping rings and the like. Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more such feature. In the description of the present invention, the meaning of "a plurality" is two or more, unless explicitly defined otherwise.
Referring to fig. 1, 3 and 4, as a specific embodiment of the conductor spacer provided by the present invention, the ferrule 4 includes a sleeve 41 and a sliding protrusion 42, and the sleeve 41 is sleeved on the outer side surface of the supporting block 1; the sliding protrusions 42 are uniformly distributed on the inner wall of the sleeve 41, and the length direction of the sliding protrusions is the same as the length direction of the axis of the sleeve 41; the outer side surface of the supporting block 1 is provided with sliding grooves 13 which are in one-to-one correspondence with the sliding protrusions 42 and are in sliding fit; each sliding groove 13 is positioned between each connecting rod 2, the sleeve 41 is sleeved on the outer side of the supporting block 1, and the sliding protrusions 42 are matched and installed in the sliding grooves 13, so that the purpose of sliding connection is achieved, the movement of the sleeve 41 can be guided, and the sleeve 41 can slide back and forth along the outer side of the supporting block 1, so that the connecting rods 2 and the clamping joints 3 can be fixed or separated. It will be understood that when an element is referred to as being "mounted" or "disposed" on another element, it can be directly on the other element or be indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or be indirectly connected to the other element.
Referring to fig. 5 and 6, as a specific embodiment of the conductor spacer provided by the present invention, the outer side surface of each connecting rod 2 is provided with an arc-shaped slot 21 which is matched with the outer wall of the sleeve 41, when the connecting rod 2 rotates to be vertical to the sleeve 41 to be connected with the conductor 5, the connecting rod 2 is hinged with the outer side of the supporting block 1, in order to ensure the stability of the connecting rod 2, the outer side of the connecting rod 2 is provided with the arc-shaped slot 21, a worker can operate the sleeve 41 to enable the sleeve 41 to slide forwards, and the outer wall of the sleeve 41 is matched with the arc-shaped slot 21 to stably support the connecting rod 2.
Referring to fig. 1, 2 and 7, as a specific embodiment of the conductor spacer provided by the invention, the clip 3 is made of an elastic material, the clip 3 is provided with a mounting hole 31 for mounting and guiding, one side of the clip 3 is provided with a strip opening 32 communicated with the mounting hole 31, the clip 3 is provided with the mounting hole 31, the conductor 5 is penetrated into the mounting hole 31, one side of the clip 3 is provided with a strip through hole, the conductor 5 enters the mounting hole 31 through the strip opening 32, and the clip 3 is made of an elastic material, so that the opening width of the strip opening 32 is smaller than the diameter of the conductor 5 and the diameter of the mounting hole 31, and the guide can squeeze the strip opening 32 to deform and enter the mounting hole 31, so that the mounting is stable and reliable and the conductor cannot fall out of the mounting hole 31. It is to be understood that the terms "length," "width," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like are merely for convenience in describing and simplifying the description based on the orientation or positional relationship shown in the drawings, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus are not to be construed as limiting the invention.
Referring to fig. 2 and 7, as a specific embodiment of the conductor spacer provided by the present invention, the cross-sectional shape of the elongated opening 32 is an inverted cone, two inclined surfaces are provided on the inverted cone-shaped elongated opening 32, and when the conductor 5 is mounted in the mounting hole 31, the outer side surface of the conductor 5 is pressed against the two inclined surfaces, so that the elastic clamping connector 3 is deformed, and the conductor 5 smoothly enters into the mounting hole 31. The width of the junction of the inverted cone and the mounting hole 31 is smaller than the diameter of the wire 5, so that the wire 5 can enter the mounting hole 31 in the forward direction and cannot escape from the mounting hole 31 in the reverse direction.
Referring to fig. 1 and fig. 2, as a specific embodiment of the conductor spacer provided by the present invention, the clip 3 includes two blocks 33, a groove 331 and a notch 332, and the two blocks 33 are oppositely disposed at one end of the connecting rod 2 far from the supporting block 1; recess 331 is provided on opposite sides of two blocks 33; the two grooves 331 are butted to form a mounting hole 31; the notch 332 is disposed on the opposite side surfaces of the two blocks 33 and is located above the groove 331, the two notches 332 are butted to form a strip opening 32, the two blocks 33 are disposed at one end of the connecting rod 2 to form a clamping head 3, the groove 331 is disposed on the opposite side surfaces of the blocks 33, the groove 331 can adopt a semicircle to form the mounting hole 31, the two notches 332 form the strip opening 32, the notch 332 is disposed at the upper corner of the opposite side surfaces of the two blocks 33, and the notch 332 is connected with the groove 331.
Referring to fig. 2, as a specific embodiment of the conductor spacer provided by the present invention, two blocks 33 are respectively connected with the connecting rod 2 through an elastic body 34, and the two blocks 33 are connected with the connecting rod 2 through the elastic body 34, so that the two blocks 33 can be elastically deformed under the action of the elastic body 34, so that the conductor 5 can be conveniently installed in the installation hole 31 from the strip opening 32, and the elastic body 34 can adopt a spring or an elastic column. The elastic body 34 can be vertically arranged at one end of the connecting rod 2, and a deep groove matched with the elastic body 34 is arranged at the bottom of the block 33, so that the elastic body 34 is stably arranged in the deep groove.
Referring to fig. 1 and fig. 4, as a specific embodiment of the conductor spacer provided by the invention, a handle 43 for holding the conductor spacer by a worker is provided at one end of the support block 1 away from the connecting rod 2, and the handle 43 is provided at one side of the support block 1, so that the conductor spacer is convenient for the worker to carry. When the staff carries the conductor spacer to the high altitude, firmly hold the handle 43, the staff is convenient for operating the cutting sleeve 4 to separate from the connecting rod 2, and the connecting rod 2 is rotated.
Referring to fig. 1 and fig. 4, as a specific embodiment of the conductor spacer provided by the invention, the outer side surface of the supporting block 1 is provided with a plurality of protruding parts corresponding to the connecting rods 2 one by one, each protruding part is provided with a second mounting groove hinged with the connecting rod 2, the protruding parts are provided with the second mounting grooves, and the connecting rod 2 can be stably mounted in the second mounting grooves and hinged with the inner wall of the second mounting grooves. When the staff controls the connecting rod 2 to rotate, the connecting position of the connecting rod 2 and the second mounting groove is used as a rotating shaft. The rotating shaft can be used to pass through the protruding part, the second mounting groove and the connecting rod 2, threads can be arranged at two ends of the rotating shaft, nuts are arranged at two ends of the rotating shaft, when the connecting rod 2 rotates to a vertical state, the connecting rod 2 and the protruding part are locked by the nuts, and the clamping connector 3 can be stably spaced from each wire 5.
The foregoing description of the preferred embodiments of the invention is not intended to be limiting, but rather is intended to cover all modifications, equivalents, and alternatives falling within the spirit and principles of the invention.
Claims (7)
1. Wire spacer, its characterized in that includes:
a support block;
the plurality of connecting rods are respectively arranged on the outer side surfaces of the supporting blocks and are hinged with the supporting blocks;
the clamping connector is arranged at one end of the connecting rod, which is far away from the supporting block, and is used for clamping the lead;
the clamping sleeve is sleeved on the outer side face of the supporting block and is in sliding fit with the outer side face of the supporting block; the clamping sleeve is arranged opposite to each connecting rod and used for fixing each connecting rod;
the outer side surface of the supporting block is provided with a plurality of first mounting grooves which are in one-to-one correspondence with the connecting rods, and each connecting rod is hinged with the inner wall of each first mounting groove; the outer side surface of the supporting block is also provided with a plurality of accommodating grooves which are communicated with the first mounting grooves and are used for mounting the connecting rods and the clamping connectors; when the connecting rod rotates towards the outer side surface of the supporting block, the connecting rod and the clamping connector are arranged in the accommodating groove, and then the connecting rod and the clamping connector are sleeved by the clamping sleeve;
the ferrule includes:
the sleeve is sleeved on the outer side surface of the supporting block;
the sliding protrusions are uniformly distributed on the inner wall of the sleeve, and the length direction of the sliding protrusions is the same as the length direction of the axis of the sleeve;
the outer side surface of the supporting block is provided with sliding grooves which are in one-to-one correspondence with the sliding protrusions and are in sliding fit with the sliding protrusions;
each sliding groove is positioned between each connecting rod;
the outer side surface of each connecting rod is provided with an arc-shaped groove which is matched with the outer wall of the sleeve; and operating the sleeve to enable the sleeve to slide forwards, and installing the outer wall of the sleeve in the arc-shaped groove in a matched manner.
2. The wire spacer of claim 1, wherein the clip is made of an elastic material, a mounting hole for mounting and guiding is formed in the clip, and a long-strip opening communicating with the mounting hole is formed in one side of the clip.
3. The wire spacer of claim 2 wherein said elongated opening has an inverted conical cross-sectional shape.
4. The wire spacer of claim 2 wherein said snap fitting comprises:
the number of the blocks is two, and the blocks are oppositely arranged at one end of the connecting rod far away from the supporting block;
the grooves are arranged on the opposite side surfaces of the two blocks; the two grooves are butted to form the mounting hole;
the notch is arranged on the opposite side surfaces of the two blocks and is positioned above the groove, and the two notches are butted to form the strip opening.
5. The wire spacer of claim 4 wherein two of said blocks are connected to said connecting rod by an elastomer, respectively.
6. The wire spacer of claim 1, wherein an end of the support block remote from the connecting rod is provided with a handle for a worker to hold the wire spacer.
7. The wire spacer of claim 1, wherein the outer side surface of the supporting block is provided with a plurality of protruding portions corresponding to the connecting rods one by one, and each protruding portion is provided with a second mounting groove hinged with the connecting rod.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811639746.1A CN109494668B (en) | 2018-12-29 | 2018-12-29 | Conductor spacer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811639746.1A CN109494668B (en) | 2018-12-29 | 2018-12-29 | Conductor spacer |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN109494668A CN109494668A (en) | 2019-03-19 |
| CN109494668B true CN109494668B (en) | 2023-10-13 |
Family
ID=65713521
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201811639746.1A Active CN109494668B (en) | 2018-12-29 | 2018-12-29 | Conductor spacer |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN109494668B (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111682484A (en) * | 2020-05-18 | 2020-09-18 | 国网河北省电力有限公司晋州市供电分公司 | Damping spring spacing rod for vibration damping and anti-galloping |
| CN112952708B (en) * | 2021-03-30 | 2023-05-05 | 国网安徽省电力有限公司亳州供电公司 | Triangle clamping plate type spacing rod for live working |
| CN115051304B (en) * | 2022-07-13 | 2024-04-16 | 国网安徽省电力有限公司经济技术研究院 | Electric power fitting with adjustable distance |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101950937A (en) * | 2010-08-24 | 2011-01-19 | 中国电力科学研究院 | Adjustable anti-galloping spacer for overhead transmission lines |
| CN102684124A (en) * | 2012-04-24 | 2012-09-19 | 中国电力科学研究院 | Five-rod lead-waving resistant power vibration absorber for transmission lines |
| CN103280754A (en) * | 2013-05-14 | 2013-09-04 | 广州鑫源恒业电力线路器材股份有限公司 | Spacer rod with single damping rubber |
| CN104167704A (en) * | 2014-07-24 | 2014-11-26 | 诸暨市超灵机械有限公司 | Spacing rod |
| CN104795756A (en) * | 2015-04-17 | 2015-07-22 | 国家电网公司 | Device for winding aluminum armor tape on transmission line and application method of device |
| CN106936106A (en) * | 2017-03-29 | 2017-07-07 | 谭泮 | A kind of conductor spacer of adjustable in length |
| CN108551146A (en) * | 2018-05-12 | 2018-09-18 | 固力发电气有限公司 | A kind of two-way conductor spacer set up suitable for high-voltage cable |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2006047924A1 (en) * | 2004-11-05 | 2006-05-11 | Xiangming Li | Connector of shelf for laying goods |
-
2018
- 2018-12-29 CN CN201811639746.1A patent/CN109494668B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101950937A (en) * | 2010-08-24 | 2011-01-19 | 中国电力科学研究院 | Adjustable anti-galloping spacer for overhead transmission lines |
| CN102684124A (en) * | 2012-04-24 | 2012-09-19 | 中国电力科学研究院 | Five-rod lead-waving resistant power vibration absorber for transmission lines |
| CN103280754A (en) * | 2013-05-14 | 2013-09-04 | 广州鑫源恒业电力线路器材股份有限公司 | Spacer rod with single damping rubber |
| CN104167704A (en) * | 2014-07-24 | 2014-11-26 | 诸暨市超灵机械有限公司 | Spacing rod |
| CN104795756A (en) * | 2015-04-17 | 2015-07-22 | 国家电网公司 | Device for winding aluminum armor tape on transmission line and application method of device |
| CN106936106A (en) * | 2017-03-29 | 2017-07-07 | 谭泮 | A kind of conductor spacer of adjustable in length |
| CN108551146A (en) * | 2018-05-12 | 2018-09-18 | 固力发电气有限公司 | A kind of two-way conductor spacer set up suitable for high-voltage cable |
Also Published As
| Publication number | Publication date |
|---|---|
| CN109494668A (en) | 2019-03-19 |
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