CN114019636B - Optical fiber array clamp and optical fiber array end face detection device - Google Patents
Optical fiber array clamp and optical fiber array end face detection device Download PDFInfo
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- CN114019636B CN114019636B CN202210002914.6A CN202210002914A CN114019636B CN 114019636 B CN114019636 B CN 114019636B CN 202210002914 A CN202210002914 A CN 202210002914A CN 114019636 B CN114019636 B CN 114019636B
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- fiber array
- optical fiber
- pull rod
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/44—Mechanical structures for providing tensile strength and external protection for fibres, e.g. optical transmission cables
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B21/00—Measuring arrangements or details thereof, where the measuring technique is not covered by the other groups of this subclass, unspecified or not relevant
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/04—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings formed by bundles of fibres
- G02B6/06—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings formed by bundles of fibres the relative position of the fibres being the same at both ends, e.g. for transporting images
- G02B6/08—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings formed by bundles of fibres the relative position of the fibres being the same at both ends, e.g. for transporting images with fibre bundle in form of plate
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- Optics & Photonics (AREA)
- Mechanical Coupling Of Light Guides (AREA)
Abstract
The invention provides an optical fiber array clamp, which relates to the field of optical fiber communication; the optical fiber array clamp includes: the device comprises a base, a pressing plate, a sliding block and a pull rod; the top of the base is provided with a guide seat, and the bottom of the guide seat is provided with a guide groove; two ends of the base are respectively provided with a limiting block and a limiting plate; the sliding block is movably arranged in the guide groove and is used for abutting against one side of the optical fiber array; the pull rod is movably arranged on the limiting plate in a penetrating way; one end of the pull rod extends into the guide groove and is connected with the sliding block; the other end of the pull rod is provided with a pull rod head; a spring is sleeved outside the pull rod; two ends of the spring are respectively abutted against the sliding block and the limiting plate, so that the spring is in a compressed state; the two sides of the pressure plate are oppositely provided with connecting plates which are used for being abutted against one side of the pull rod head; one end of the pressure plate is rotatably connected with the base through a connecting plate; the bottom of the pressing plate is provided with a pressing block which is used for being abutted against the top of the optical fiber array; the invention also provides an optical fiber array end face detection device which can conveniently clamp the optical fiber array.
Description
Technical Field
The invention relates to the field of optical fiber communication, in particular to an optical fiber array clamp and an optical fiber array end face detection device.
Background
As the progress of current optical networks is accelerated, the construction operations of optical fiber networks are becoming more and more standardized, especially for fiber-optic end-face detection. According to statistics, 95% of the optical fibers which fail the test are related to the uncleanness of the end face of the optical fiber, and the reason for the uncleanness is that the end face detection operation of the optical fiber is not performed when the optical fiber is connected with equipment. If the optical fiber end face does not use a proper optical fiber end face detection tool, the data center or the network is difficult to operate quickly, the service life of the optical module is greatly shortened, and the whole optical network system is also seriously influenced. If the optical fiber end face does not use a proper optical fiber end face detection tool, the data center or the network is difficult to operate quickly, the service life of the optical module is greatly shortened, and meanwhile, the whole optical network system is seriously influenced. The detection of the end face of the optical fiber becomes an indispensable operation step, if the end face is not detected and cleaned, the stained end face is the first number 'killer' causing the optical fiber wiring fault, and tiny dust, oil stains and the like between optical fiber connectors cause the loss of optical communication signals, form reverse reflection and damage optical network equipment; meanwhile, the existence of a large number of dirty optical fiber connectors can also pollute other optical fiber connectors, so that the attenuation loss of optical signals is increased, and the signal transmission quality of the optical network is affected.
The optical fiber array is FA for short, on an array substrate provided with a V-shaped groove, the bare optical fiber part with the optical fiber coating removed is placed in the V-shaped groove, a pressurizing cover plate is covered and then is bonded through glue, and then the end face of the optical fiber array is ground and polished to obtain an FA optical fiber array product. The polished end face of the optical fiber array needs to be detected whether stains, damages and the like exist. Currently, an optical fiber array is clamped and fixed by an optical fiber array clamp, and then whether the end face of the optical fiber array is stained or damaged or not is observed under a CCD camera. The utility model with publication number CN202329585U discloses an optical fiber array end face detection clamp, which comprises a base and a fixed block fixedly connected with one side of the base, wherein one end of the fixed block is rotatably connected with a pressing handle; a pressing block is formed on the bottom side of the pressing handle, a fixing groove is formed in the corresponding position of the fixing block, and the height of the pressing block is smaller than the depth of the fixing groove; the fixed block is provided with an insertion hole which is communicated with the fixed groove, and a thimble is arranged in the insertion hole; during the use, for better centre gripping fiber array, need accomplish rotatory handle of pressing and insert two actions of thimble in order to realize that fiber array is fixed in the centre gripping of horizontal direction and vertical direction, it is not convenient enough to use to the efficiency of fiber array terminal surface detection has been reduced.
Disclosure of Invention
The invention aims to solve the technical problem that the existing optical fiber array end face detection clamp is not convenient to use.
The invention provides an optical fiber array clamp, comprising: the device comprises a base, a pressing plate, a sliding block and a pull rod;
the top of the base is provided with a guide seat, and the bottom of the guide seat is provided with a guide groove; two ends of the base are respectively provided with a limiting block and a limiting plate;
the sliding block is movably arranged in the guide groove and is used for abutting against one side of the optical fiber array; the pull rod is movably arranged on the limiting plate in a penetrating manner; one end of the pull rod extends into the guide groove and is connected with the sliding block; the other end of the pull rod is provided with a pull rod head; a spring is sleeved on the outer side of the pull rod; two ends of the spring are respectively abutted against the sliding block and the limiting plate, so that the spring is in a compressed state;
two connecting plates are oppositely arranged on two sides of one end of the pressing plate and are used for abutting against one side of the pull rod head; one end of the pressing plate is rotatably connected with the base through the connecting plate; the bottom of the pressing plate is provided with a pressing block which is used for being abutted against the top of the optical fiber array; when the pressing plate is in a closed state, the pressing block is abutted against the top of the optical fiber array, and the limiting block and the sliding block are respectively abutted against two opposite side walls of the optical fiber array; when the pressing plate is turned upwards, the connecting plate is abutted against one side of the pull rod head, so that the sliding block moves to be separated from the optical fiber array.
Furthermore, a first magnet is arranged at the top of the limiting block; correspondingly, one end of the pressing plate is provided with a second magnet matched with the first magnet; the first magnet is matched with the second magnet and used for adsorbing one end of the pressing plate at the top of the limiting block, so that the pressing block is abutted to the top of the optical fiber array.
Furthermore, the sliding block is detachably connected with one end of the pull rod.
Furthermore, a clamping groove is formed in one side of the sliding block; correspondingly, one end of the pull rod is provided with a clamping block matched with the clamping groove; the clamping block is clamped in the clamping groove; the pull rod with the slider passes through the draw-in groove with the joint piece cooperation can be dismantled and be connected.
Further, the pressing block is an elastic pressing block; the elastic pressing block is connected with the pressing plate through glue.
Furthermore, the elastic pressing block is made of silica gel or rubber.
Furthermore, the limiting block and the limiting plate are detachably connected with the base respectively.
Further, the guide seat is connected with the base in an integrated forming mode.
The invention also provides an optical fiber array end face detection device, which comprises a base, a CCD camera and the optical fiber array clamp; the optical fiber array clamp and the CCD camera are arranged on the base; the optical fiber array clamp is used for clamping the optical fiber array; the CCD camera is used for assisting in observing the end face to be detected of the optical fiber array.
Furthermore, the optical fiber array end face detection device also comprises an adjusting mechanism used for adjusting the spatial position and/or the inclination angle of the end face to be detected of the optical fiber array; the optical fiber array clamp is arranged on the base through the adjusting mechanism.
The technical scheme provided by the embodiment of the invention has the following beneficial effects: the optical fiber array clamp in the embodiment of the invention comprises a base, a pressing plate, a sliding block and a pull rod; the top of the base is provided with a guide seat, and the bottom of the guide seat is provided with a guide groove; two ends of the base are respectively provided with a limiting block and a limiting plate; the sliding block is movably arranged in the guide groove and is used for abutting against one side of the optical fiber array; the pull rod is movably arranged on the limiting plate in a penetrating manner; one end of the pull rod extends into the guide groove and is connected with the sliding block; the other end of the pull rod is provided with a pull rod head; a spring is sleeved on the outer side of the pull rod; two ends of the spring are respectively abutted against the sliding block and the limiting plate, so that the spring is in a compressed state; two connecting plates are oppositely arranged on two sides of one end of the pressing plate and are used for abutting against one side of the pull rod head; one end of the pressing plate is rotatably connected with the base through the connecting plate; the bottom of the pressing plate is provided with a pressing block which is used for being abutted against the top of the optical fiber array; when the pressure plate is turned upwards to be in an open state, the connecting plate is abutted against one side of the pull rod head in the process of turning the pressure plate upwards, so that the sliding block moves towards one end far away from the limiting block along the guide groove; placing the array of optical fibers on top of the base; then the pressing plate is turned downwards to a closed state, so that the pressing block is abutted against the top of the optical fiber array to clamp and fix the optical fiber array in the vertical direction, and in the process of turning the pressing plate downwards, the sliding block moves towards one end close to the limiting block along the guide groove under the action of the elastic force of the spring, so that the limiting block and the sliding block are respectively abutted against two opposite side walls of the optical fiber array to clamp and fix the optical fiber array in the horizontal direction; the pressing plate can clamp and fix the optical fiber array in the horizontal direction and the vertical direction by turning up and down, and the use is convenient.
Drawings
FIG. 1 is a schematic perspective view of an optical fiber array end face detection apparatus according to an embodiment of the present invention;
FIG. 2 is a schematic perspective view of the optical fiber array fixture 3 of the optical fiber array detection apparatus of FIG. 1;
FIG. 3 is a side view of the fiber array clamp 3 of FIG. 2;
FIG. 4 is a schematic cross-sectional view taken along the direction A-A of the optical fiber array holder 3 of FIG. 3;
fig. 5 is a schematic perspective view of the optical fiber array clamp 3 of fig. 2 with the pressing plate 33 in an open state;
FIG. 6 is a side view of the fiber array clamp 3 of FIG. 5;
FIG. 7 is a schematic cross-sectional view of the optical fiber array holder 3 of FIG. 6 along the direction B-B;
FIG. 8 is a schematic perspective view of the base 31 of the optical fiber array clamp 3 of FIG. 4;
FIG. 9 is a schematic perspective view of the pressing plate 33 of the optical fiber array fixture 3 of FIG. 4;
fig. 10 is a schematic perspective view of a limiting block 32 in the optical fiber array fixture 3 of fig. 4;
FIG. 11 is a schematic perspective view of the slider 34 of the optical fiber array holder 3 of FIG. 4;
FIG. 12 is a schematic perspective view of the pulling rod 35 of the optical fiber array holder 3 of FIG. 4;
FIG. 13 is a schematic perspective view of a prior art optical fiber array;
wherein, 1, a base; 2. an adjustment mechanism; 3. an optical fiber array fixture; 31. a base; 311. a guide seat; 312. a guide groove; 32. a limiting block; 321. a first magnet; 33. pressing a plate; 331. a second magnet; 332. briquetting; 333. a connecting plate; 34. a slider; 341. a card slot; 35. a pull rod; 351. a tie rod head; 352. connecting columns; 353. a clamping block; 36. a spring; 37. a limiting plate; 38. a fixing plate; 4. a CCD camera; 5. an optical fiber array; 51. and (5) detecting the end face to be detected.
Detailed Description
The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate preferred embodiments of the invention and together with the description, serve to explain the principles of the invention and not to limit the scope of the invention.
Referring to fig. 2 to 9, an embodiment of the invention provides an optical fiber array fixture, including: a base 31, a pressure plate 33, a slide block 34 and a pull rod 35;
the top of the base 31 is provided with a guide seat 311, and the bottom of the guide seat 311 is provided with a guide groove 321; the guide groove 321 is provided along the length direction of the base 31; two ends of the base 31 are respectively provided with a limiting block 32 and a limiting plate 37;
the slider 34 is movably disposed in the guide groove 321 for abutting against one side of the optical fiber array 5; the pull rod 35 is movably arranged on the limit plate 37 in a penetrating way; one end of the pull rod 35 extends into the guide groove 321 and is connected with the slide block 34; the other end of the pull rod 35 is provided with a pull rod head 351; the outer side of the pull rod 35 is sleeved with a spring 36; two ends of the spring 36 are respectively abutted with the slide block 34 and the limit plate 37, so that the spring 36 is in a compressed state;
two connecting plates 333 are oppositely arranged on two sides of one end of the pressure plate 33 and are used for abutting against one side of the pull rod head 351; one end of the pressure plate 33 is rotatably connected with the base 31 through a connecting plate 333; the bottom of the pressing plate 33 is provided with a pressing block 332 for abutting against the top of the optical fiber array 5; when the pressing plate 33 is in a closed state, the pressing block 332 abuts against the top of the optical fiber array 5, and the limiting block 32 and the sliding block 34 abut against two opposite side walls of the optical fiber array 5 respectively; when the pressing plate 33 is turned upward, the connecting plate 333 abuts against one side of the draw head 351, so that the slider 34 moves to be separated from the optical fiber array 5.
Referring to fig. 4 and 10, in order to better press the pressing block 332 on the top of the optical fiber array 5, the top of the stopper 32 is provided with a first magnet 321; accordingly, one end of the pressing plate 33 is provided with a second magnet 331 used in cooperation with the first magnet 321; the first magnet 321 is matched with the second magnet 331 for adsorbing one end of the pressing plate 33 on the top of the limiting block 32, so that the pressing block 332 is abutted against the top of the optical fiber array 5.
For example, in the present embodiment, the limiting block 32 is provided with a first mounting hole (not shown in the figure); the pressing plate 33 is provided with a second mounting hole (not shown in the figure); the first magnet 321 is fixed in the first mounting hole through glue; the second magnet 331 is fixed in the second mounting hole by glue.
Referring to fig. 4, 11 and 12, the slider 34 is detachably connected to one end of the pull rod 35.
Specifically, in the present embodiment, a clamping groove 341 is provided on one side of the slider 34; the card slot 341 is a T-shaped card slot 341; correspondingly, one end of the pull rod 35 is provided with a clamping block 353 used in cooperation with the clamping groove 341; the clamping block 353 is arranged at one end of the pull rod 35 through a connecting column 352; the clamping block 353 is detachably clamped in the clamping groove 341; the pull rod 35 and the slide block 34 are matched and detachably connected with the clamping block 353 through the clamping groove 341.
In order to avoid damage to fiber array 5 caused by compacts 332, compacts 332 are elastic compacts 332; the elastic pressing block 332 is connected with the pressing plate 33 through glue; the elastic pressing block 332 is made of silica gel or rubber.
In this embodiment, the elastic pressing piece 332 is made of silicone rubber.
Specifically, the limiting block 32 and the limiting plate 37 are detachably connected to the base 31 through bolts; the guide holder 311 is integrally formed with the base 31.
In this embodiment, the fiber array clamp further includes a fixing plate 38; the base 31 is detachably provided at one end of the fixed plate 38 by bolts.
Referring to fig. 1 and 13, the present invention further provides an optical fiber array end face detection apparatus, which includes a base 1, a CCD camera 4 and the optical fiber array clamp 3; the optical fiber array clamp 3 and the CCD camera 4 are arranged on the base 1; the optical fiber array clamp 3 is used for clamping an optical fiber array 5; the CCD camera 4 is used to assist in observing the end face 51 to be detected of the optical fiber array 5.
In order to detect the end faces 51 to be detected of the optical fiber arrays 5 with different inclination angles, the optical fiber array end face detection device further comprises an adjusting mechanism 2, which is used for adjusting the spatial position and/or the inclination angle of the end faces 51 to be detected of the optical fiber arrays 5; the optical fiber array clamp 3 is arranged on the base 1 through the adjusting mechanism 2; the fixing plate 38 is detachably mounted on the top of the adjusting mechanism 2 by bolts.
Illustratively, in the present embodiment, the adjusting mechanism 2 is an angle-inclined sliding table, and can adjust the position of the optical fiber array fixture 3 in the X-axis, Y-axis and Z-axis directions and the inclination angle of the optical fiber array fixture 3, thereby adjusting the position and the inclination angle of the end surface 51 to be detected in the X-axis, Y-axis and Z-axis directions.
It should be noted that the four-axis tilt angle adjusting table is prior art, and therefore, the detailed structure thereof is not described herein.
The application method of the fiber array clamp in the embodiment is as follows: when the device is used, the pressing plate 33 is turned upwards to an open state, and in the process of turning the pressing plate 33 upwards, the connecting plate 333 is abutted against one side of the pull rod head 351, so that the sliding block 34 moves towards one end far away from the limiting block 32 along the guide groove 321; placing the optical fiber array 5 on top of the base 31; then, the pressing plate 33 is turned downwards to a closed state, so that the pressing block 332 is abutted against the top of the optical fiber array 5 to clamp and fix the optical fiber array 5 in the vertical direction, and in the process of turning the pressing plate 33 downwards, the sliding block 34 moves towards one end close to the limiting block 32 along the guide groove 321 under the action of the elastic force of the spring 36, so that the limiting block 32 and the sliding block 34 are respectively abutted against two opposite sides of the optical fiber array 5 to clamp and fix the optical fiber array 5 in the horizontal direction; the clamping and fixing of the optical fiber array 5 in the horizontal direction and the vertical direction can be realized through the up-down turning of the pressing plate 33, and the use is convenient.
The use method of the fiber array end face detection device in the embodiment is as follows:
clamping and fixing an optical fiber array 5 through an optical fiber array clamp 3; the position of the optical fiber array 5 and the inclination angle of the end face 51 to be detected are adjusted by the adjusting mechanism 2, so that a tester can observe the end face 51 to be detected of the optical fiber array 5 through the CCD camera 4, and whether stains, damages and the like exist on the end face 51 to be detected of the optical fiber array 5 is detected.
The above is not relevant and is applicable to the prior art.
In this document, the terms front, back, upper and lower are used to define the components in the drawings and the positions of the components relative to each other, and are used for clarity and convenience of the technical solution. It is to be understood that the use of the directional terms should not be taken to limit the scope of the claims.
The features of the embodiments and embodiments described herein above may be combined with each other without conflict.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (10)
1. An optical fiber array fixture, comprising: the device comprises a base, a pressing plate, a sliding block and a pull rod;
the top of the base is provided with a guide seat, and the bottom of the guide seat is provided with a guide groove; two ends of the base are respectively provided with a limiting block and a limiting plate;
the sliding block is movably arranged in the guide groove and is used for abutting against one side of the optical fiber array; the pull rod is movably arranged on the limiting plate in a penetrating manner; one end of the pull rod extends into the guide groove and is connected with the sliding block; the other end of the pull rod is provided with a pull rod head; a spring is sleeved on the outer side of the pull rod; two ends of the spring are respectively abutted against the sliding block and the limiting plate, so that the spring is in a compressed state;
two connecting plates are oppositely arranged on two sides of one end of the pressing plate and are used for abutting against one side of the pull rod head; one end of the pressing plate is rotatably connected with the base through the connecting plate; the bottom of the pressing plate is provided with a pressing block which is used for being abutted against the top of the optical fiber array; when the pressing plate is in a closed state, the pressing block is abutted against the top of the optical fiber array, and the limiting block and the sliding block are respectively abutted against two opposite side walls of the optical fiber array; when the pressing plate is turned upwards, the connecting plate is abutted against one side of the pull rod head, so that the sliding block moves to be separated from the optical fiber array.
2. The fiber array clamp of claim 1, wherein a first magnet is disposed on a top of the stopper; correspondingly, one end of the pressing plate is provided with a second magnet matched with the first magnet; the first magnet is matched with the second magnet and used for adsorbing one end of the pressing plate at the top of the limiting block, so that the pressing block is abutted to the top of the optical fiber array.
3. The fiber array clamp of claim 1, wherein the slider is removably coupled to one end of the pull rod.
4. The fiber array clamp of claim 3, wherein one side of the slider is provided with a slot; correspondingly, one end of the pull rod is provided with a clamping block matched with the clamping groove; the clamping block is clamped in the clamping groove; the pull rod with the slider passes through the draw-in groove with the joint piece cooperation can be dismantled and be connected.
5. The fiber array clamp of claim 1, wherein the compact is an elastomeric compact; the elastic pressing block is connected with the pressing plate through glue.
6. The optical fiber array fixture of claim 5, wherein the elastic pressing block is made of silicone or rubber.
7. The optical fiber array fixture of claim 1, wherein the limiting block and the limiting plate are detachably connected to the base respectively.
8. The fiber array clamp of claim 1, wherein the guide block is integrally connected to the base.
9. An optical fiber array end face detection device, characterized by comprising a base, a CCD camera and an optical fiber array clamp according to any one of claims 1-8; the optical fiber array clamp and the CCD camera are arranged on the base; the optical fiber array clamp is used for clamping the optical fiber array; the CCD camera is used for assisting in observing the end face to be detected of the optical fiber array.
10. The fiber array end face detection device according to claim 9, further comprising an adjusting mechanism for adjusting a spatial position and/or an inclination angle of the end face to be detected of the fiber array; the optical fiber array clamp is arranged on the base through the adjusting mechanism.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210002914.6A CN114019636B (en) | 2022-01-05 | 2022-01-05 | Optical fiber array clamp and optical fiber array end face detection device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210002914.6A CN114019636B (en) | 2022-01-05 | 2022-01-05 | Optical fiber array clamp and optical fiber array end face detection device |
Publications (2)
| Publication Number | Publication Date |
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| CN114019636A CN114019636A (en) | 2022-02-08 |
| CN114019636B true CN114019636B (en) | 2022-03-15 |
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| CN202210002914.6A Active CN114019636B (en) | 2022-01-05 | 2022-01-05 | Optical fiber array clamp and optical fiber array end face detection device |
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Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116380934A (en) * | 2023-06-02 | 2023-07-04 | 中山市美速光电技术有限公司 | Quality inspection system for detecting ultra-micro spacing optical fiber array |
| CN117020984B (en) * | 2023-08-03 | 2024-02-02 | 武汉驿路通科技股份有限公司 | FA and isolator coupling clamp and coupling method |
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| CN202329585U (en) * | 2011-11-09 | 2012-07-11 | 奉化市宇达高科光电器件有限公司 | Fiber array end face detection fixture |
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| CN213690060U (en) * | 2020-12-09 | 2021-07-13 | 安徽医视佳智能科技有限公司 | Jump ring formula optical lens piece compact structure |
| CN213956730U (en) * | 2021-01-19 | 2021-08-13 | 上海雍邑光电科技有限公司 | Fiber array optical fiber broken detection device |
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| EP0504096A2 (en) * | 1991-03-15 | 1992-09-16 | Scitex Corporation Ltd. | Assembly of elongated elements, particularly a fibre optic head, and a method of making same |
| WO1999027392A2 (en) * | 1997-11-24 | 1999-06-03 | Corning Incorporated | Fiber array cleaving |
| US6736553B1 (en) * | 2001-01-12 | 2004-05-18 | Optical Communication Products, Inc. | VCSEL array optical subassembly module with alignment mechanism |
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| Publication number | Publication date |
|---|---|
| CN114019636A (en) | 2022-02-08 |
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