CN111900014A - Double-column rotary open type isolating switch wiring seat, conductive seat and isolating switch - Google Patents
Double-column rotary open type isolating switch wiring seat, conductive seat and isolating switch Download PDFInfo
- Publication number
- CN111900014A CN111900014A CN202010639550.3A CN202010639550A CN111900014A CN 111900014 A CN111900014 A CN 111900014A CN 202010639550 A CN202010639550 A CN 202010639550A CN 111900014 A CN111900014 A CN 111900014A
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- hole
- conductive
- isolating switch
- connecting part
- seat
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H31/00—Air-break switches for high tension without arc-extinguishing or arc-preventing means
- H01H31/02—Details
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H1/00—Contacts
- H01H1/58—Electric connections to or between contacts; Terminals
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- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Rotary Switch, Piano Key Switch, And Lever Switch (AREA)
Abstract
The utility model provides a rotatory open-type isolator wire holder of twin columns, electrically conductive seat and isolator, the rotatory open-type isolator wire holder of twin columns includes: the first connecting part is internally provided with a cavity structure; the upper side of the first connecting part is provided with a first through hole, the lower side of the first connecting part is provided with a second through hole corresponding to the first through hole, and the first through hole and the second through hole are jointly used for connecting a conductive shaft of the isolating switch conductive seat; the right side of the first connecting part is used for connecting one end of a flexible conductive belt of the isolating switch conductive seat; the second connecting part is used for connecting the isolating switch conducting rod and the first connecting part; the first connecting part and the second connecting part are of an integrally formed structure. According to the embodiment of the invention, the cavity is arranged in the first connecting part, so that the volume of the wire holder is reduced, and the wire holder is convenient to connect with other parts in the conductive seat. Through designing into integrated into one piece structure with first connecting portion and second connecting portion, simplified the process of wire holder processing, the structure of integration also better lets the electric current circulation simultaneously.
Description
Technical Field
The invention belongs to the field of isolating switches, and particularly relates to a double-column rotary opening type isolating switch wire holder, a conductive seat and an isolating switch.
Background
In an electric power system, the double-column rotary starting type isolating switch is widely applied to substations with voltages of 35KV and above. And the wire holder is a component which is difficult to avoid by most isolating switches. At present, most of wire holders of the double-column rotary opening type isolating switch adopt casting structures, the casting structures are complex in structure, and the casting cost is high; in addition, the problems of high weight, poor heat dissipation and the like are easily caused due to the complex structure, so that the working stability of the isolating switch is poor, the long-term stable operation of the power system is seriously hindered, and the cost of the power grid in operation and maintenance is increased.
Disclosure of Invention
The present invention is directed to solving at least one of the problems of the prior art. Therefore, the invention provides a double-column rotary opening type isolating switch wire holder which is simple in structure and solves the problems of complex structure and high cost of the wire holder. The invention also provides a conductive seat and an isolating switch.
According to an embodiment of the first aspect of the invention, the double-column rotary opening type disconnecting switch wire holder comprises: a first connection portion and a second connection portion; the first connecting part is internally provided with a cavity structure; the upper side of the first connecting part is provided with a first through hole, the lower side of the first connecting part is provided with a second through hole corresponding to the first through hole, and the first through hole and the second through hole are jointly used for connecting a conductive shaft of a conductive seat of an isolating switch; the right side of the first connecting part is used for connecting one end of a flexible conductive belt of the isolating switch conductive seat; the second connecting part is used for connecting the isolating switch conducting rod and the first connecting part; the second connecting portion and the first connecting portion are of an integrally formed structure.
The double-column rotary open type isolating switch wire holder provided by the embodiment of the invention at least has the following technical effects: through the built-in cavity in first connecting portion, can reduce the holistic volume of wire holder, also be convenient for simultaneously with the connection of other parts in the conductive seat. The first connecting part and the second connecting part are designed into an integrally formed structure, so that the processing process of the wire holder can be greatly simplified, and meanwhile, compared with a split structure, the integrally formed structure can better allow current to flow; in addition, the split structure is easy to corrode seriously due to long-time open air, so that the circulation of current is greatly influenced, the integrated structure can greatly reduce the influence of the problem, and the split structure can only corrode the surface of the connecting seat and cannot corrode the connecting part of a plurality of parts.
According to some embodiments of the invention, the first connection portion is provided with a boss on an outer surface of a lower side thereof.
According to some embodiments of the invention, the first and second via surfaces are provided with an insulating layer.
According to some embodiments of the invention, the right side of the first connecting portion is opened with a connecting through hole.
According to some embodiments of the present invention, an end of the second connecting portion, which is far away from the first connecting portion, is provided with a mounting through hole.
According to some embodiments of the invention, the material of the first connecting portion and the material of the second connecting portion are both aluminum alloy.
The double-column rotary opening type isolating switch conductive seat comprises: the double-column rotary open type isolating switch wiring seat, the conductive shaft, the wiring terminal board and the flexible conductive belt; a conductive shaft disposed in the first and second through holes of the first connection portion; one end of the flexible conductive belt is connected with the inner surface of the right side of the first connecting part, and the other end of the flexible conductive belt is connected with the conductive shaft; and the terminal board is connected with one end of the conductive shaft, which is far away from the second through hole.
The double-column rotary open type isolating switch conducting seat provided by the embodiment of the invention at least has the following technical effects: the double-column rotary open type isolating switch wiring seat is added, so that the whole structure of the conductive seat is simplified, and the cost of the whole conductive seat is reduced by phase change. The connection to the disconnector body can be achieved by connecting the terminal board and the conductive shaft. A stable current transfer may be provided by the flexible conductive strip.
According to some embodiments of the invention, both ends of the flexible conductive strip are provided with through holes.
According to some embodiments of the invention, the contact portion of the conductive shaft and the first and second through holes is provided with an insulating layer.
The isolating switch according to the third aspect of the embodiment of the invention comprises an isolating switch body and the double-column rotary opening type isolating switch conductive seat.
The isolating switch provided by the embodiment of the invention at least has the following technical effects: the structure of the isolating switch can be simplified by adding the double-column rotary open type isolating switch conductive seat, and the cost of the whole isolating switch is reduced by phase change. And simultaneously, the stability of current transmission is improved.
Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.
Drawings
The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:
FIG. 1 is a schematic structural diagram of a wire holder according to an embodiment of the present invention
Fig. 2 is an operational view of the wire holder according to the embodiment of the present invention.
Reference numerals:
a first connection portion 100, a first through hole 110, a second through hole 120, a boss 130, a connection through hole 140,
A second connecting portion 200, a mounting through-hole 210,
A conductive shaft 300,
A flexible conductive band 400,
A conductive rod 500,
A terminal board 600,
A porcelain insulator upper flange 700.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the accompanying drawings are illustrative only for the purpose of explaining the present invention, and are not to be construed as limiting the present invention.
In the description of the present invention, if there are first, second, third, fourth, etc. described only for the purpose of distinguishing technical features, they are not to be interpreted as indicating or implying relative importance or implying number of indicated technical features or implying precedence of indicated technical features.
In the description of the present invention, unless otherwise explicitly defined, terms such as arrangement, connection and the like should be broadly construed, and those skilled in the art can reasonably determine the specific meanings of the above terms in the present invention in combination with the detailed contents of the technical solutions.
A two-post rotary opening disconnector wire holder according to an embodiment of the first aspect of the present invention will be described with reference to fig. 1 to 2.
According to an embodiment of the first aspect of the invention, the double-column rotary opening type disconnecting switch wire holder comprises: a first connection portion 100 and a second connection portion 200. A first connection portion 100 having a hollow structure therein; the upper side of the first connecting part 100 is provided with a first through hole 110, the lower side is provided with a second through hole 120 corresponding to the first through hole 110, and the first through hole 110 and the second through hole 120 are used for connecting a conductive shaft 300 of the conductive seat of the isolating switch together; the right side of the first connecting part 100 is used for connecting one end of the flexible conductive strip 400 of the isolating switch conductive socket; a second connection part 200 for connecting the disconnection switch conductive bar 500 and the first connection part 100; the first connection portion 100 and the second connection portion 200 are integrally formed.
Referring to fig. 1 and 2, the first connection portion 100 has a cavity structure therein, and a flexible conductive tape 400 is connected to the inner surface of the right side of the first connection portion 100. The connection of the flexible conductive tape 400 to the inner surface of the right side of the first connection portion 100 may be performed by means of bolt fastening, welding, a clamping groove, or the like. Most of the second connection portion 200 is disposed inside the conductive rod 500 of the disconnector, so that the stability of the installation of the wire holder according to the embodiment of the present invention can be ensured. The upper side of the first connecting portion 100 is provided with a first through hole 110, the lower side of the first connecting portion 100 is provided with a second through hole 120 corresponding to the first through hole 110, the first through hole 110 and the second through hole 120 are used as shaft holes of the conductive shaft 300, and the conductive shaft 300 penetrates from the first through hole 110 and enters the second through hole 120, so that the conductive shaft 300 can be ensured to rotate in the first connecting portion 100. In some embodiments of the present invention, in order to ensure that the conductive shaft 300 does not directly contact the first through hole 110 and the second through hole 120, an insulating sleeve may be added at a portion where the conductive shaft 300 contacts the first through hole 110 and the second through hole 120.
In addition, different current levels can be accommodated by selecting the size of the second connection portion 200 with different lengths and heights. The current level of the isolating switch is the current capacity of the conducting part of the isolating switch, the current capacity is in direct proportion to the current cross section of the right cavity of the wire holder and the conducting rod 500, and the larger the current cross section is, the larger the current capacity is, and the smaller the current capacity is. The through-flow section of the wire holder is equal to length and is multiplied by height, and when the height is fixed, the size of the through-flow section can be changed by changing the length of the right cavity of the wire holder during processing.
According to the wiring holder of the double-column rotary opening type disconnecting switch provided by the embodiment of the invention, the cavity is arranged in the first connecting part 100, so that the overall volume of the wiring holder can be reduced, and meanwhile, the connection with other parts in the conductive holder is facilitated. The first connecting part 100 and the second connecting part 200 are designed into an integrally formed structure, so that the processing process of the wire holder can be greatly simplified, and meanwhile, the integrated structure can better lead current to flow; in addition, the split structure is easy to corrode seriously due to long-time open air, so that the circulation of current is greatly influenced, the integrated structure can greatly reduce the influence of the problem, and the split structure can only corrode the surface of the connecting seat and cannot corrode the connecting part of a plurality of parts.
In some embodiments of the present invention, the lower outer surface of the first connection portion 100 is provided with a boss 130. In practical engineering, the lower end surface of the conductive shaft 300 may extend out of the lower side of the first connection portion 100, and the extending length of the conductive shaft 300 may be smaller than the height of the boss 130, and in some embodiments of the present invention, the lower end surface of the conductive shaft 300 may also be selected to be flush with the outer surface of the lower side of the first connection portion 100, so as to ensure that the wire holder of the embodiments of the present invention can be connected to the surface of the porcelain insulator upper flange 700 of the isolator, and meanwhile, due to the existence of the boss 130, a gap may exist between the bottom surface of the conductive shaft 300 and the surface of the porcelain insulator upper flange 700, so that friction between the conductive shaft 300 and the surface of the porcelain insulator upper flange 700 during rotation can be prevented, and normal.
In some embodiments of the present invention, the first via hole 110 and the second via hole 120 are surface-provided with an insulating layer. Since the conductive shaft 300 needs to be rotated and thus the connection is not necessarily stable, providing an insulating layer on the surfaces of the first through hole 110 and the second through hole 120 may prevent the conductive shaft 300 from being directly connected to the first connection portion 100 through the first through hole 110 and the second through hole 120. In addition, the insulating layer may also make the rotation of the conductive shaft 300 smoother, and in some embodiments of the present invention, the insulating layer may be an insulating sleeve, which may further facilitate the rotation of the conductive shaft 300.
In some embodiments of the present invention, the right side of the first connecting portion 100 is opened with a connecting through hole 140. Referring to fig. 1 and 2, the right side of the first connection portion 100 is provided with the connection through hole 140, and the portion of the flexible conductive strip 400 connected to the right side of the first connection portion 100 is also provided with a corresponding through hole, so that the flexible conductive strip 400 can be quickly and stably connected to the right side of the first connection portion 100 by using a bolt fastener. In addition, the through holes are formed and the bolt fastening pieces are used for connection, so that the flexible conductive belt 400 is more convenient to disassemble, and can be replaced only after the bolts are disassembled when the flexible conductive belt 400 needs to be replaced, and the whole wire holder possibly needs to be replaced by adopting welding and other modes.
In some embodiments of the present invention, an end of the second connecting portion 200 away from the first connecting portion 100 is provided with a mounting through hole 210. The connection between the second connecting portion 200 and the conductive rod 500 is various, and the welded connection is firm, but is not convenient for later replacement, and may even damage the isolating switch body when the isolating switch body needs to be replaced. The second connection portion 200 is connected to the first connection portion 100 by a bolt fastener through a mounting through hole 210. Referring to fig. 1 and 2, an end of the second connection portion 200 connected to the conductive rod 500 is provided with a mounting through hole in a radial direction of the conductive rod 500, the conductive rod 500 is provided with a through hole corresponding to the mounting through hole, a groove capable of allowing the second connection portion 200 to be partially inserted is provided at a tip of the conductive rod 500, and after the second connection portion 200 is inserted into the groove, a bolt is used to pass through the through hole of the conductive rod 500 and the mounting through hole 210 of the second connection portion 200, and then fastening is performed. After fastening the plurality of through holes in the same manner, the second connection portion 200 is connected to the conductive rod 500. The mode is adopted for connection, on one hand, the wire holder is convenient to replace subsequently, and on the other hand, the connection stability can be improved.
In some embodiments of the present invention, the first connecting portion 100 has a rectangular parallelepiped structure, which is convenient for transportation and has higher stability when installed. The second connection portion 200 has a cylindrical structure, which is similar to the conductive rod 500, and facilitates the installation of the conductive rod 500 in a built-in manner, and the cylindrical structure has high stability and can bear a certain strength.
In some embodiments of the present invention, the second connection portion 200 is also provided with a cavity inside. In practical engineering, part of the disconnecting switches do not need too high current-carrying capacity, and at this time, if the size of the second connection portion 200 is merely reduced, the strength of the second connection portion 200 may be greatly reduced, and at this time, if a cavity is provided in the second connection portion 200, a certain current-carrying capacity may be ensured, and at the same time, a greater strength may be provided.
In some embodiments of the present invention, the material of the first connection portion 100 and the material of the second connection portion 200 are both made of aluminum alloy. The aluminum alloy has the characteristics of light total amount and high strength, can greatly reduce the weight of the wire holder, has higher strength, and is also favorable for keeping the stability of the wire holder in subsequent operation. In addition, the aluminum alloy has high corrosion resistance, and can prevent the wire holder from being seriously corroded when the wire holder runs outdoors for a long time.
The double-column rotary opening type isolating switch conductive seat comprises: the double-column rotary opening type disconnecting switch wire holder, the conductive shaft 300, the terminal board 600 and the flexible conductive belt 400. A conductive shaft 300 disposed in the first and second through holes 110 and 120 of the first connection portion 100; a terminal board 600 connected to an end of the conductive shaft 300 remote from the second through-hole 120; and a flexible conductive tape 400 having one end connected to the right inner surface of the first connection part 100 and the other end connected to the conductive shaft 300.
Referring to fig. 2, the connection of the flexible conductive tape 400 to the inner surface of the right side of the first connection portion 100 may be performed by means of bolt fastening, welding, a clamping groove, etc. Most of the second connection portion 200 is disposed inside the conductive rod 500 of the disconnection switch, so that the stability of the installation of the wire holder according to the embodiment of the present invention can be ensured. The upper side of the first connecting portion 100 is provided with a first through hole 110, the lower side of the first connecting portion 100 is provided with a second through hole 120 corresponding to the first through hole 110, the first through hole 110 and the second through hole 120 are used as shaft holes of the conductive shaft 300, and the conductive shaft 300 penetrates from the first through hole 110 and enters the second through hole 120, so that the conductive shaft 300 can be ensured to rotate in the first connecting portion 100. The end of the shaft 300 remote from the second through-hole 120 is connected to a terminal block 600, which is finally used to connect an external wire clamp.
When in use, the conductive socket of the embodiment of the invention is installed on the upper surface of the upper flange 700 of the porcelain insulator of the isolating switch, so that the outer surface of the lower side of the first connecting part 100 is connected with the upper surface of the upper flange 700 of the porcelain insulator, and the axis of the conductive shaft 300 is the same as the axis of the rotation of the upper flange 700 of the porcelain insulator of the isolating switch. Meanwhile, the terminal board 600 is connected to an external clamp. When the isolating switch works, the terminal board 600 and the conductive shaft 300 are fixed by the tension of an external wire clamp; in the opening and closing processes of the isolating switch, the wiring base rotates, meanwhile, due to the adoption of the flexible conductive belt 400, the wiring base can rotate around the conductive shaft 300 relatively, the rotation of the wiring base drives the conductive rod 500 to rotate, and the condition that the conductive rod 500 is blocked due to the fact that the wiring terminal board 600 and the conductive shaft 300 are pulled by an external wire clamp in the opening and closing processes of the isolating switch is further prevented.
According to the double-column rotary open type isolating switch conducting seat provided by the embodiment of the invention, the whole structure of the conducting seat can be simplified by adding the double-column rotary open type isolating switch wiring seat, and the cost of the whole conducting seat is reduced by changing phases. The connection with the disconnection switch body can be achieved by connecting the terminal board 600 and the conductive shaft 300 together. Stable current transfer may be provided by the flexible conductive strip 400.
In some embodiments of the present invention, both ends of the flexible conductive strip 400 are provided with through holes. Referring to fig. 1 and 2, a through hole is formed at one end of the flexible conductive strip 400 connected to the wire holder, so that the connection with the wire holder can be facilitated. In practical engineering, in order to ensure the connection between the flexible conductive strip 400 and the wire holder, the right side of the first connection portion 100 is also provided with the connection through holes 140 corresponding to the through holes on the flexible conductive strip 400, so that the bolt fasteners can be used to realize the fast and stable connection between the flexible conductive strip 400 and the right side of the first connection portion 100 through the through holes. Referring to fig. 1 and 2, a through hole is formed at one end of the flexible conductive band 400 connected to the conductive shaft 300 to facilitate connection with the conductive shaft 300, and the connection with the conductive shaft 300 is also fastened by a bolt fastener. In addition, the through holes are formed and the bolt fastening pieces are used for connection, so that the flexible conductive belt 400 is more convenient to detach, the flexible conductive belt can be replaced only after the bolts are detached, and the whole conductive seat can be replaced by adopting welding and other modes.
In some embodiments of the present invention, the contact portion of the conductive shaft 300 and the first and second through holes 110 and 120 is provided with an insulating layer. Providing an insulating layer may prevent the conductive shaft 300 from being connected to the first connection portion 100 through the first and second through holes 110 and 120 because the conductive shaft 300 needs to be rotated and thus the connection must be unstable. In addition, the insulating layer may also make the rotation of the conductive shaft 300 smoother, and in some embodiments of the present invention, the insulating layer may be an insulating sleeve, which may further facilitate the rotation of the conductive shaft 300.
According to the embodiment of the third aspect of the invention, the isolating switch comprises an isolating switch body and the double-column rotary opening type isolating switch conductive seat.
Referring to fig. 1 and 2, the lower outer surface of the first connection portion 100 is mounted on the upper surface of the upper flange 700 of the porcelain bottle of the disconnector body, and the second connection portion 200 is mounted in the conductive rod 500 of the disconnector.
According to the isolating switch provided by the embodiment of the invention, the structure of the isolating switch can be simplified by adding the double-column rotary open type isolating switch conducting seat, and the cost of the whole isolating switch is reduced by changing the phase. And simultaneously, the stability of current transmission is improved.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an illustrative embodiment," "an example," "a specific example," or "some examples" or the like mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
Although the embodiments of the present invention have been described in detail with reference to the accompanying drawings, the present invention is not limited to the embodiments, and those skilled in the art will understand that: various changes, modifications, substitutions and alterations can be made to the embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.
Claims (10)
1. The utility model provides a two post rotation open-type isolator wire holders which characterized in that includes:
a first connection part (100) having a cavity structure therein; a first through hole (110) is formed in the upper side of the first connecting part (100), a second through hole (120) corresponding to the first through hole (110) is formed in the lower side of the first connecting part, and the first through hole (110) and the second through hole (120) are jointly used for connecting a conductive shaft (300) of a conductive seat of an isolating switch; the right side of the first connecting part (100) is used for connecting one end of a flexible conductive strip (400) of the isolating switch conductive seat;
a second connection part (200) for connecting the disconnecting switch conductive rod (500) and the first connection part (100); the second connecting part (200) and the first connecting part (100) are of an integrally formed structure.
2. The connector holder of the dual column rotary on type disconnecting switch according to claim 1, wherein the lower outer surface of the first connecting portion (100) is provided with a boss (130).
3. The connector holder of claim 1, wherein the first and second through holes (110, 120) are provided with an insulating layer on the surface.
4. The connector holder of the dual-column rotary opening type disconnecting switch according to claim 1, wherein the right side of the first connecting portion (100) is provided with a connecting through hole (140).
5. The connector holder of claim 1, wherein the second connecting portion (200) has a mounting hole (210) at an end thereof remote from the first connecting portion (100).
6. The connector holder of claim 1, wherein the first connecting portion (100) and the second connecting portion (200) are made of aluminum alloy.
7. The utility model provides a two post rotation open-type isolator conductive seat which characterized in that includes: the connector holder of the double-column rotary opening type disconnecting switch as claimed in any one of claims 1 to 6; and
a conductive shaft (300) disposed in the first through hole (110) and the second through hole (120) of the first connection portion (100);
a flexible conductive tape (400) having one end connected to the right inner surface of the first connection part (100) and the other end connected to the conductive shaft (300);
and a terminal board (600) connected to one end of the conductive shaft (300) remote from the second through hole (120).
8. The dual-post rotary on-type disconnector conductive socket according to claim 7, wherein both ends of the flexible conductive strap (400) are provided with through holes.
9. The dual-column rotary on-type disconnector conductive socket according to claim 7, wherein an insulating layer is disposed at a contact portion of the conductive shaft (300) and the first and second through holes (110, 120).
10. A disconnector comprising a disconnector body and a double-post rotary on-disconnector contact block according to any one of claims 7 to 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010639550.3A CN111900014A (en) | 2020-07-06 | 2020-07-06 | Double-column rotary open type isolating switch wiring seat, conductive seat and isolating switch |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010639550.3A CN111900014A (en) | 2020-07-06 | 2020-07-06 | Double-column rotary open type isolating switch wiring seat, conductive seat and isolating switch |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN111900014A true CN111900014A (en) | 2020-11-06 |
Family
ID=73191631
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010639550.3A Pending CN111900014A (en) | 2020-07-06 | 2020-07-06 | Double-column rotary open type isolating switch wiring seat, conductive seat and isolating switch |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN111900014A (en) |
-
2020
- 2020-07-06 CN CN202010639550.3A patent/CN111900014A/en active Pending
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