CN111313191A - Cable connecting system for testing electrical equipment of power plant - Google Patents
Cable connecting system for testing electrical equipment of power plant Download PDFInfo
- Publication number
- CN111313191A CN111313191A CN202010083160.2A CN202010083160A CN111313191A CN 111313191 A CN111313191 A CN 111313191A CN 202010083160 A CN202010083160 A CN 202010083160A CN 111313191 A CN111313191 A CN 111313191A
- Authority
- CN
- China
- Prior art keywords
- clamping
- core wire
- electrical equipment
- power plant
- aligning
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Classifications
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
- H01R13/00—Details of coupling devices of the kinds covered by groups H01R12/70 or H01R24/00 - H01R33/00
- H01R13/62—Means for facilitating engagement or disengagement of coupling parts or for holding them in engagement
- H01R13/622—Screw-ring or screw-casing
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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
- H01R13/00—Details of coupling devices of the kinds covered by groups H01R12/70 or H01R24/00 - H01R33/00
- H01R13/62—Means for facilitating engagement or disengagement of coupling parts or for holding them in engagement
- H01R13/629—Additional means for facilitating engagement or disengagement of coupling parts, e.g. aligning or guiding means, levers, gas pressure electrical locking indicators, manufacturing tolerances
- H01R13/631—Additional means for facilitating engagement or disengagement of coupling parts, e.g. aligning or guiding means, levers, gas pressure electrical locking indicators, manufacturing tolerances for engagement only
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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
- H01R13/00—Details of coupling devices of the kinds covered by groups H01R12/70 or H01R24/00 - H01R33/00
- H01R13/62—Means for facilitating engagement or disengagement of coupling parts or for holding them in engagement
- H01R13/639—Additional means for holding or locking coupling parts together, after engagement, e.g. separate keylock, retainer strap
Abstract
The invention relates to a cable connecting system for testing electrical equipment in a power plant. The cable connecting system for the power plant electrical equipment test comprises a first core wire, a clamping assembly and a second core wire assembly, the first core wire is electrically connected with the electrical equipment, a round sleeve is arranged at the end of the first core wire, a stop ring is arranged on the periphery of the round sleeve in an outward protruding mode and is provided with an external thread, the clamping assembly comprises two clamping alignment blocks and an insulating clamping frame, and the two clamping alignment blocks are arranged on the inner side of the round sleeve relatively. The cable connecting system for the power plant electrical equipment test is not easy to generate butt joint dislocation.
Description
Technical Field
The invention relates to a cable connecting system for testing electrical equipment in a power plant.
Background
In power plants it is sometimes necessary to test electrical equipment, which requires quick connection or disconnection of cables. In a general cable connection process, two sections of core wires need to be butted, and butting and dislocation are easily caused during butting, so that connection stability is affected.
Disclosure of Invention
Therefore, a cable connection system for testing electrical equipment in a power plant, which is not easy to generate butt joint dislocation, is needed.
A cable connecting system for testing electrical equipment in a power plant comprises a first core wire, a clamping assembly and a second core wire assembly, wherein the first core wire is electrically connected with the electrical equipment, a round sleeve is arranged at the end part of the first core wire, a stop ring is convexly arranged at the periphery of the round sleeve outwards and forms an external thread, the clamping assembly comprises two clamping alignment blocks and an insulating clamping frame, the two clamping alignment blocks are oppositely arranged at the inner side of the round sleeve, one end of each clamping alignment block is rotationally connected in the round sleeve, the second core wire assembly comprises a second core wire and a screw joint barrel, the second core wire is arranged in the screw joint barrel, the screw joint barrel is used for being screwed on the round sleeve, so that the end part of the second core wire abuts against the end part of the first core wire, and the electrical connection between the second core wire and the first core wire is realized, the insulating clamping frame is used for clamping the two clamping and aligning blocks to rotate so as to force the two clamping and aligning blocks to fixedly hold the butt joint of the first core wire and the second core wire.
In one embodiment, the end of the first core wire is fixed to the end of the round sleeve, and a first butt end is formed by extending the end of the first core wire into the round sleeve and is located in the middle of the two clamping and aligning blocks.
In one embodiment, each clamping and aligning block is provided with a V-shaped groove, and the V-shaped grooves on the two clamping and aligning blocks are oppositely arranged to form a clamping groove together.
In one embodiment, the interface of the first core wire and the second core wire is located within the clamping slot.
In one embodiment, each of the clamping and aligning blocks includes a connecting end and a clamping end which are oppositely arranged, and the first connecting end is a free end and is located between the connecting end and the clamping end of the clamping and aligning block.
In one embodiment, the connecting end is rotatably connected to the inside of the circular sleeve, the clamping end is adjacent to the screw cylinder, and an end of the screw cylinder abuts against the stop ring.
In one embodiment, an internal thread is formed inside the screw cylinder, and the internal thread is screwed with the external thread of the circular sleeve.
In one embodiment, the end of the round sleeve away from the second core assembly is fixed to the end periphery of the first core, the first butt end is a cylindrical metal body, the depth of the V-shaped groove increases gradually in the direction toward the clamping end,
in one embodiment, the circumference of the first core wire is coated with a wrapping skin, the end of the wrapping skin is connected with the end of the round sleeve, and the second core wire is coaxially arranged in the center of the screw cylinder.
In one embodiment, a clamping groove is concavely formed on the circular sleeve, the clamping groove is adjacent to the stop ring, and an elastic buckle is arranged on the periphery of the end of the screwing cylinder and clamped in the clamping groove.
When the first core wire and the second core wire need to be connected, the screw thread cylinder is screwed outside the circular sleeve, so that the end part of the second core wire moves towards the first core wire and abuts against the end part of the first core wire, and the electrical connection between the second core wire and the first core wire is realized. Then the insulating clamping frame is used for clamping the two clamping aligning blocks to rotate so as to force the two clamping aligning blocks to fixedly hold the butt joint of the first core wire and the second core wire, so that the first core wire and the second core wire are accurately aligned, the aligning accuracy of the first core wire and the second core wire can be improved, the butt joint dislocation is avoided, and the connection stability is improved.
Drawings
Fig. 1 is a perspective view of a cable connection system for testing electrical equipment in a power plant according to an embodiment.
Fig. 2 is a perspective view illustrating a partial structure of a cable connection system for testing electrical equipment in a power plant according to an embodiment.
Fig. 3 is a perspective view of another perspective view of the cable connection system for electrical device testing of the power plant shown in fig. 1.
Fig. 4 is a partially enlarged view of a portion a in fig. 1.
FIG. 5 is a schematic plan view of a second linear slot of an embodiment.
Detailed Description
To facilitate an understanding of the invention, the invention will now be described more fully with reference to the accompanying drawings. Preferred embodiments of the present invention are shown in the drawings. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.
It will be understood that when an element is referred to as being "secured to" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "left," "right," and the like as used herein are for illustrative purposes only and do not represent the only embodiments.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.
The invention relates to a cable connecting system for testing electrical equipment in a power plant. For example, the cable connecting system for the power plant electrical equipment test comprises a first core wire, a clamping assembly and a second core wire assembly, wherein the first core wire is electrically connected with the electrical equipment. For example, a circular sleeve is arranged at the end of the first core wire, a stop ring is convexly arranged on the periphery of the circular sleeve outwards and is provided with an external thread, and the clamping assembly comprises two clamping alignment blocks and an insulating clamping frame. For example, the two clamping and aligning blocks are oppositely arranged on the inner side of the circular sleeve, one end of each clamping and aligning block is rotatably connected into the circular sleeve, and the second core wire assembly comprises a second core wire and a screwing cylinder. For example, the second core wire is disposed in the screw cylinder, and the screw cylinder is screwed to the circular sleeve, so that an end of the second core wire abuts against an end of the first core wire, and the second core wire and the first core wire are electrically connected. For example, the insulating clamping frame is used for clamping the two clamping alignment blocks to rotate so as to force the two clamping alignment blocks to hold the butt joint of the first core wire and the second core wire.
Referring to fig. 1 to 4, a cable connection system for testing electrical equipment in a power plant includes a first core wire, a clamping assembly 20, and a second core wire assembly 30, where the first core wire is electrically connected to the electrical equipment, a circular sleeve 15 is disposed at an end of the first core wire, a stop ring 16 is convexly disposed on a circumference of the circular sleeve 15, and an external thread 17 is formed on the circumference of the circular sleeve 15, the clamping assembly 20 includes two clamping alignment blocks 21 and an insulating clamping frame 23, the two clamping alignment blocks 21 are disposed relatively on an inner side of the circular sleeve 15, one end of each clamping alignment block 21 is rotatably connected in the circular sleeve 15, the second core wire assembly 30 includes a second core wire (not shown) and a screw cylinder 31, the second core wire is disposed in the screw cylinder 31, the screw cylinder 31 is used for screwing on the circular sleeve 15, so that an end of the second core wire abuts against an end of the first core wire, the electrical connection between the second core wire and the first core wire is realized, and the insulating clamping frame 23 is used for clamping the two clamping and aligning blocks 21 to rotate so as to force the two clamping and aligning blocks 21 to fixedly hold the butt joint of the first core wire and the second core wire.
When the first core wire and the second core wire need to be connected, the screw cylinder 31 is screwed to the outside of the circular sleeve 15, so that the end of the second core wire moves toward the first core wire and abuts against the end of the first core wire, thereby realizing the electrical connection between the second core wire and the first core wire. Then, the two clamping and aligning blocks 21 are clamped by the insulating clamping frame 23 to rotate, so that the two clamping and aligning blocks 21 are forced to fixedly hold the butt joint of the first core wire and the second core wire, the first core wire and the second core wire are accurately aligned, the alignment accuracy of the first core wire and the second core wire can be improved, the butt joint dislocation is avoided, and the connection stability is improved.
For example, in order to facilitate clamping the first core wire and the second core wire, an end portion of the first core wire is fixed to an end portion of the circular sleeve 15, and a first abutting end (not shown) is formed by extending the end portion of the first core wire into the circular sleeve 15, and the first abutting end is located in the middle of the two clamping and aligning blocks 21. Each of the clamping and aligning blocks 21 is formed with a V-shaped groove 215, and the V-shaped groove 215 is formed in a V shape when viewed from the end of the clamping and aligning block 21 in the axial direction of the circular sleeve 15. The V-shaped grooves 215 of the two clamping and aligning blocks 21 are oppositely arranged to form a clamping groove together. The butt joint of the first core wire and the second core wire is positioned in the clamping groove. By forming the V-shaped groove 215 on the clamping and aligning block 21, the peripheral edges of the first core wire/the second core wire are easily matched to guide and clamp and hold the butt joint of the first core wire and the second core wire.
For example, in order to facilitate the insertion of the second core wire into the clamping groove, each clamping and aligning block 21 includes a connecting end and a clamping end 212 which are oppositely arranged, and the first connecting end is a free end and is located between the connecting end and the clamping end 212 of the clamping and aligning block 21. The connecting end is rotatably connected in the circular sleeve 15, the clamping end 212 is adjacent to the screw cylinder 31, and the end of the screw cylinder 31 abuts against the stop ring 16. An internal thread is formed inside the thread cylinder 31, and the internal thread is screwed with the external thread 17 of the circular sleeve 15. The end of the circular sleeve 15 away from the second core assembly 30 is fixed to the periphery of the end of the first core, the first butt end is a metal cylinder (i.e. the first butt end is a metal cylinder protruding from the end of the first core and located in the clamping groove), and the depth of the V-shaped groove 215 gradually increases in the direction toward the clamping end 212. Through the change of the depth of the V-shaped groove 215, the size of the clamping groove is gradually increased along the direction towards the second core wire, so that the second core wire conveniently enters the clamping groove from a wider place, and the second core wire is conveniently inserted.
For example, the first core wire is coated with a wrapping sheath at its periphery, the wrapping sheath has an end connected to an end of the round sleeve 15, and the second core wire is coaxially disposed at the center of the screw cylinder 31. A clamping groove 151 is concavely arranged on the round sleeve 15, the clamping groove 151 is adjacent to the stop ring 16, an elastic buckle 311 is arranged on the periphery of the end part of the screwing cylinder 31, and the elastic buckle 311 is clamped in the clamping groove 151. By providing the elastic catch 311 and the catch groove 151, the screw cylinder 31 and the circular sleeve 15 are fastened after the screw cylinder 31 and the circular sleeve 15 are screwed together, and the screw cylinder 31 is prevented from being loosened arbitrarily. The elastic clip 311 is disposed on the end periphery of the screw cylinder 31, so as to facilitate deformation of the elastic clip 311, facilitate the elastic clip to be fastened into the slot 151 by passing over the external thread, and also prompt that the screw cylinder 31 is screwed in place.
For example, it is particularly important to refer to fig. 5 that, in order to facilitate the rotation of the two clamping alignment blocks 21, two first linear grooves 152 are formed through the circular sleeve 15, the two first linear grooves 152 are parallel to the axis of the circular sleeve 15, two second linear grooves 315 are formed in the screwing cylinder 31, the two second linear grooves 315 are parallel to the axis of the screwing cylinder 31, linear driving grooves 214 are formed in both the two clamping alignment blocks 21, and an enlarged circular groove is formed at an end of each linear driving groove 214 and located at a connection end of the clamping alignment block 21. The distance between the two linear driving grooves 214 is gradually increased in a direction away from the connection end. The two second linear grooves 315 are aligned with the two first linear grooves 152, the insulating clamping frame 23 includes an operating rod 231 and two driving rods 233, the two driving rods 233 are vertically disposed at two opposite ends of the operating rod 231, and the two driving rods 233 are inserted into the two first linear grooves 152. The end parts of the two driving rods 233 are respectively inserted into the linear driving grooves 214 of the two clamping and aligning blocks 21. Under the action of external force, the insulating clamping frame 23 is used to drive the two driving rods 233 to move along the two first linear grooves 152 away from the first core wire, so as to force the two clamping and aligning blocks 21 to rotate, and the clamping ends 212 of the two clamping and aligning blocks 21 clamp the end of the second core wire. For example, the circular sleeve 15 is fixed to the first core beforehand. In order to facilitate the insertion of the second core wire, a side of the clamping end 212 of each clamping and aligning block 21 facing away from the V-shaped groove 215 is provided with a tension spring (not shown) made of an insulating material, such as rubber. The extension springs on the two clamping and aligning blocks 21 are used for pulling the clamping ends 212 of the two clamping and aligning blocks 21 away from each other, so that the second core wire can enter conveniently, and when the insulating clamping frame 23 is clamped, the two driving rods 233 can clamp the two clamping and aligning blocks 21 to overcome the pulling force of the two extension springs and close. By providing the insulating clamp 23, the stability of connection between the first alignment end and the second core wire can be improved. The enlarged circular grooves of the two linear driving grooves 214 can utilize a larger diameter to facilitate the insertion of the two driving rods 233. When the screw is mounted, the elastic catch 311 is provided on the end periphery of the screw cylinder 31, so that the second linear groove 315 and the first linear groove 152 are aligned. The first linear groove 152 penetrates the external thread 17, and the second linear groove 315 penetrates the internal thread. The end of the elastic buckle 311 is provided with a plurality of chip removal tips. During screwing, the plurality of chip discharging tips are respectively rotationally moved along the plurality of thread grooves of the external thread 17, and the first straight line groove 152 is used for discharging the chips pushed by the plurality of chip discharging tips, so that the screwing cylinder 31 and the circular sleeve 15 can be screwed together conveniently.
For example, in order to improve the sealing performance, a circular hole 318 is formed at one end of the second linear groove 315 adjacent to the stop ring 16, a redundant section 319 is formed at one end of the second linear groove 315 adjacent to the stop ring 16, the redundant section 319 is located at one side of the circular hole 318, the diameter of the circular hole 318 is larger than the width of the second linear groove 315, sliding slots are formed on two opposite side walls of the second linear groove 315, a rubber wide belt 314 is arranged in the second linear groove 315, one end of the rubber wide belt 314 is connected to the end of the redundant section 319 adjacent to the stop ring 16, and a collar 317 is arranged at the other end of the rubber wide belt 314, and the collar 317 is aligned with the circular hole 318. The lantern ring 317 is used for the insertion of the driving rod 233, so that the driving rod 233 is driven by the driving rod 233 to move to one end of the second linear groove 315 away from the circular hole 318, the rubber wide band 314 is forced to stretch and fully cover the second linear groove 315, two opposite sides of the rubber wide band 314 are respectively inserted into the two sliding slots, and two opposite sides of the lantern ring 317 are respectively inserted into the two sliding slots. By arranging the two sliding slots and the rubber wide band 314, the two second linear grooves 315 can be further closed by the rubber wide band 314 after the two clamping and aligning blocks 21 are clamped, so that the sealing effect is improved, and at this time, the tension of the rubber wide band 314 is not enough to pull the insulating clamping frame 23 to move. For example, in one embodiment, the operating rod 231 is an arc-shaped rod, and the screwing cylinder 31 is provided with an arc-shaped groove at a side away from the stop ring 16, and opposite ends of the arc-shaped groove are respectively connected with ends of the two second linear grooves 315. After the insulating clamping frame 23 is moved, the arch bar is clamped in the arc-shaped groove, so that the rubber broadband 314 cannot pull the insulating clamping frame 23 to retreat. For example, the linear driving groove 214 communicates with the V-shaped groove 215, and a locking groove 2155 is formed on the surface of the V-shaped groove 215 corresponding to the linear driving groove 214. After the insulating clamping frame 23 is moved, when the arch bar is pressed into the arc groove, the end of each driving rod 233 is inserted into the stopping groove 2155, and the middle parts of the two driving rods 233 are respectively clamped on two opposite sides of the second core wire. Through the arrangement of the clamping groove 2155, the insulating clamping frame 23 is convenient to fix, and the insulating clamping frame 23 can more firmly fix the two clamping and aligning blocks 21 and clamp and fix the second core wire, so that the connection stability is improved. When the cable is removed, the insulating clamping frame 23 is pulled out, the elastic buckle 311 is pulled out, and the screwing cylinder 31 can be rotated reversely, so that the screwing cylinder 31 and the round sleeve 15 are separated from each other, the first core wire and the second core wire are separated, and finally the cable is quickly connected and disconnected.
The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the present invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (10)
1. A cable connecting system for testing electrical equipment in a power plant is characterized by comprising a first core wire, a clamping assembly and a second core wire assembly, wherein the first core wire is electrically connected with the electrical equipment, a round sleeve is arranged at the end part of the first core wire, a stop ring is convexly arranged on the periphery of the round sleeve outwards and forms an external thread, the clamping assembly comprises two clamping alignment blocks and an insulating clamping frame, the two clamping alignment blocks are oppositely arranged on the inner side of the round sleeve, one end of each clamping alignment block is rotationally connected in the round sleeve, the second core wire assembly comprises a second core wire and a screw joint barrel, the second core wire is arranged in the screw joint barrel, the screw joint barrel is used for being screwed on the round sleeve, so that the end part of the second core wire abuts against the end part of the first core wire to realize the electrical connection of the second core wire and the first core wire, the insulating clamping frame is used for clamping the two clamping and aligning blocks to rotate so as to force the two clamping and aligning blocks to fixedly hold the butt joint of the first core wire and the second core wire.
2. The power plant electrical equipment test cable connection system as recited in claim 1, wherein an end of the first core wire is fixed to an end of the circular sleeve, the end of the first core wire extends into the circular sleeve to form a first butt end, and the first butt end is located in a middle of the two clamping and aligning blocks.
3. The power plant electrical equipment test cable connection system of claim 2, wherein each clamping and aligning block is formed with a V-shaped groove, and the V-shaped grooves of the two clamping and aligning blocks are oppositely arranged to form a clamping groove together.
4. The power plant electrical equipment test cable connection system of claim 3, wherein a butt joint of the first core wire and the second core wire is located within the clamping slot.
5. The power plant electrical equipment test cable connection system of claim 4, wherein each clamping and aligning block comprises a connection end and a clamping end that are arranged oppositely, and the first connection end is a free end and is located between the connection end and the clamping end of the clamping and aligning block.
6. The power plant electrical equipment test cable connection system of claim 5, wherein the connection end is rotatably connected within the circular sleeve, the clamping end is adjacent to the threaded barrel, and an end of the threaded barrel abuts against the stop ring.
7. The power plant electrical equipment test cable connection system as claimed in claim 6, wherein an internal thread is formed inside the screw cylinder, and the internal thread is screwed with the external thread of the circular sleeve.
8. The power plant electrical equipment test cable connection system of claim 7, wherein an end of the round sleeve distal from the second core assembly is fixed to a periphery of an end of the first core, the first mating end is a cylindrical metal body, a depth of the V-shaped groove increases gradually toward the clamping end,
9. the power plant electrical equipment test cable connection system as claimed in claim 8, wherein the first core wire is coated with a coating skin around the circumference, the end of the coating skin is connected to the end of the round sleeve, and the second core wire is coaxially arranged in the center of the screw cylinder.
10. The power plant electrical equipment test cable connection system as claimed in claim 9, wherein a slot is concavely formed on the circular sleeve, the slot is adjacent to the stop ring, and an elastic buckle is arranged on a circumference of an end of the screw cylinder and is clamped in the slot.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010083160.2A CN111313191B (en) | 2020-02-08 | 2020-02-08 | Cable connecting system for testing electrical equipment of power plant |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010083160.2A CN111313191B (en) | 2020-02-08 | 2020-02-08 | Cable connecting system for testing electrical equipment of power plant |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN111313191A true CN111313191A (en) | 2020-06-19 |
| CN111313191B CN111313191B (en) | 2021-07-06 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010083160.2A Active CN111313191B (en) | 2020-02-08 | 2020-02-08 | Cable connecting system for testing electrical equipment of power plant |
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| Country | Link |
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| CN (1) | CN111313191B (en) |
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| CN117080797A (en) * | 2023-10-17 | 2023-11-17 | 天津市小猫线缆股份有限公司 | Multi-core power cable |
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Also Published As
| Publication number | Publication date |
|---|---|
| CN111313191B (en) | 2021-07-06 |
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Inventor after: He Maoqun Inventor after: Su Ning Inventor after: Li Weihu Inventor after: Cui Bin Inventor after: Chen Bangzhen Inventor after: Huang Song Inventor before: Huang Song |
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