CN108444688B - Circuit breaker and sensor fixing device for circuit breaker - Google Patents
Circuit breaker and sensor fixing device for circuit breaker Download PDFInfo
- Publication number
- CN108444688B CN108444688B CN201810434214.8A CN201810434214A CN108444688B CN 108444688 B CN108444688 B CN 108444688B CN 201810434214 A CN201810434214 A CN 201810434214A CN 108444688 B CN108444688 B CN 108444688B
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- China
- Prior art keywords
- bottom plate
- circuit breaker
- compressing
- fixing
- sensor
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- 230000007246 mechanism Effects 0.000 claims abstract description 44
- 239000004677 Nylon Substances 0.000 claims description 16
- 229920001778 nylon Polymers 0.000 claims description 16
- 230000033001 locomotion Effects 0.000 claims description 8
- 230000006835 compression Effects 0.000 claims description 4
- 238000007906 compression Methods 0.000 claims description 4
- 238000012360 testing method Methods 0.000 abstract description 11
- 230000000694 effects Effects 0.000 abstract description 9
- 238000006073 displacement reaction Methods 0.000 abstract description 6
- 238000000034 method Methods 0.000 description 4
- 230000003139 buffering effect Effects 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 238000001514 detection method Methods 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 230000001360 synchronised effect Effects 0.000 description 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M13/00—Testing of machine parts
Abstract
The present utility model relates to a circuit breaker and a sensor fixing device for the circuit breaker. The circuit breaker includes the bottom plate, and the fixed sensor fixing device that is equipped with on the bottom plate, sensor fixing device include the support, and the support has two at least contact positions that are used for compressing tightly fixedly with the bottom plate, be equipped with on support or the bottom plate and be used for compressing tightly fixed hold-down mechanism with contact position and bottom plate, still be equipped with the fixing base that is used for fixed sensor on the support, the projection of fixing base and two of them contact positions on the bottom plate constitutes triangle-shaped. After the conducting rod of the sensor is fixed with the pull rod of the circuit breaker, at least three points of fixation are formed between the sensor fixing device and the circuit breaker through the fixing seat and at least two contact parts, so that a stable effect is achieved, the displacement of the sensor fixing device caused by severe vibration during opening and closing of the circuit breaker can be reduced, and the accuracy of a test result is ensured.
Description
Technical Field
The present utility model relates to a circuit breaker and a sensor fixing device for the circuit breaker.
Background
The circuit breaker is an important device for ensuring the normal and safe operation of the circuit, and as the power grid scale expands year by year, according to regulations, the mechanical characteristics of the circuit breaker must be tested when the circuit breaker is connected and overhauled.
The mechanical characteristic test of the circuit breaker comprises opening and closing time, speed, travel, opening distance, bouncing and the like, and currently, when the mechanical characteristic test of the circuit breaker is carried out, intelligent characteristic detection is carried out by using a displacement sensor matched with a microcomputer type switch characteristic tester.
The Chinese patent publication No. CN206095609U, publication No. 2017.04.12 discloses a sensor fixing device for use in a speed test process of a circuit breaker, the sensor fixing device comprises a fixing block with a through hole for fixing a sensor, the fixing block is fixed on a fixing plate through a connecting frame, and the fixing plate is fixed on the circuit breaker through a bolt.
During testing, the authenticity and accuracy of the test result data must be ensured so as to provide reliable reference data for judging the performance of the circuit breaker, and the conducting rod of the sensor should be firmly fixed with the pull rod of the circuit breaker to realize synchronous movement between the conducting rod and the pull rod of the circuit breaker. The fixing plate of the sensor fixing device is fixed on the circuit breaker through the bolts, the fixing plate is equivalent to a cantilever beam structure, and the circuit breaker can release a large amount of energy when being switched on and off, so that the fixing plate can generate severe vibration, and the sensor fixing device can displace to influence the accuracy of a test result.
Disclosure of Invention
The utility model aims to provide a sensor fixing device for a circuit breaker, which is used for solving the problem that the accuracy of a test result is affected by displacement of the sensor fixing device when a circuit breaker is switched on or off in the prior art; the utility model also provides a circuit breaker using the sensor fixing device for the circuit breaker.
In order to solve the technical problems, the technical scheme of the circuit breaker is as follows:
the circuit breaker comprises a bottom plate, a sensor fixing device is fixedly arranged on the bottom plate, the sensor fixing device comprises a support, the support is provided with at least two contact parts which are used for being pressed and fixed with the bottom plate, a pressing mechanism which is used for pressing and fixing the contact parts and the bottom plate is arranged on the support or the bottom plate, a fixing seat which is used for fixing the sensor is further arranged on the support, and the fixing seat and the projection of the two contact parts on the bottom plate form a triangle.
The beneficial effect of this technical scheme lies in: the support has two at least contact positions that are used for compressing tightly fixed with the bottom plate, and the fixing base constitutes triangle-shaped with the projection of two contact positions wherein on the bottom plate, after the conducting rod of sensor is fixed with the pull rod of circuit breaker, forms at least three-point fixation through fixing base, two at least contact positions between sensor fixing device and the circuit breaker, reaches stable effect, and sensor fixing device's displacement because of violent vibrations when can reduce the circuit breaker divide-shut brake guarantees the accuracy of test result.
The compressing end of the compressing mechanism moves linearly along the direction vertical to the bottom plate so as to compress the contact part and the bottom plate. The compressing end of the compressing mechanism moves linearly, so that the compressing effect is good, and the compressing mechanism is not easy to loosen.
The compressing mechanism drives the compressing end to do linear motion through threads. The processing cost of the thread is low, and the installation and the operation are easy.
The compressing mechanism comprises a threaded hole which is arranged on the bracket and extends along the direction perpendicular to the bottom plate, and a screw rod which is matched with the threaded hole, and the compressing end is positioned at one end part of the screw rod. The threaded hole and the screw are simple to assemble, and the cost is low.
The end part of the screw rod, which is close to the bottom plate, is sleeved with a nylon sleeve, and the nylon sleeve forms the compression end. The nylon sleeve can play a role in buffering the contact between the screw and the bottom plate.
The support comprises a main support arm extending in the direction perpendicular to the bottom plate, two ends of the main support arm are respectively located at two sides of the bottom plate, a first extending part and a second extending part extending perpendicular to the main support arm are respectively arranged on two sides of the bottom plate, the contact part is arranged on the first extending part, the screw is screwed on the second extending part, and the fixing base is located on the main support arm. The contact part, the pressing mechanism and the fixing seat are respectively fixed at different positions of the bracket, so that projections on the bottom plate form a triangle, and three-point fixation is realized.
The first extension part and the second extension part are cantilever structures, the cantilevers forming the first extension part and the cantilevers forming the second extension part are opposite in the direction perpendicular to the bottom plate, the contact parts are positioned at the end parts of the cantilevers, and the number of the pressing mechanisms is equal to that of the contact parts. The cantilever structure is simple in form and convenient to process, the number of the pressing mechanisms is equal to that of the contact parts, each pressing mechanism correspondingly presses and fixes one contact part, and the fixing effect is good.
The technical scheme of the sensor fixing device for the circuit breaker is as follows:
the sensor fixing device for the circuit breaker comprises a support, wherein the support is provided with at least two contact parts which are used for being pressed and fixed with a bottom plate of the circuit breaker, a pressing mechanism which is used for pressing and fixing the contact parts and the bottom plate is arranged on the support, a fixing seat which is used for fixing a sensor is also arranged on the support, and the fixing seat and the projection of the two contact parts on the bottom plate form a triangle.
The beneficial effect of this technical scheme lies in: the support has two at least contact positions that are used for compressing tightly fixed with the bottom plate, and the fixing base constitutes triangle-shaped with the projection of two contact positions wherein on the bottom plate, after the conducting rod of sensor is fixed with the pull rod of circuit breaker, forms at least three-point fixation through fixing base, two at least contact positions between sensor fixing device and the circuit breaker, reaches stable effect, and sensor fixing device's displacement because of violent vibrations when can reduce the circuit breaker divide-shut brake guarantees the accuracy of test result.
The compressing end of the compressing mechanism moves linearly along the direction vertical to the bottom plate so as to compress the contact part and the bottom plate. The compressing end of the compressing mechanism moves linearly, so that the compressing effect is good, and the compressing mechanism is not easy to loosen.
The compressing mechanism drives the compressing end to do linear motion through threads. The processing cost of the thread is low, and the installation and the operation are easy.
The compressing mechanism comprises a threaded hole which is arranged on the bracket and extends along the direction perpendicular to the bottom plate, and a screw rod which is matched with the threaded hole, and the compressing end is positioned at one end part of the screw rod. The threaded hole and the screw are simple to assemble, and the cost is low.
The end part of the screw rod, which is close to the bottom plate, is sleeved with a nylon sleeve, and the nylon sleeve forms the compression end. The nylon sleeve can play a role in buffering the contact between the screw and the bottom plate.
The support comprises a main support arm extending in the direction perpendicular to the bottom plate, two ends of the main support arm are respectively located at two sides of the bottom plate, a first extending part and a second extending part extending perpendicular to the main support arm are respectively arranged on two sides of the bottom plate, the contact part is arranged on the first extending part, the screw is screwed on the second extending part, and the fixing base is located on the main support arm. The contact part, the pressing mechanism and the fixing seat are respectively fixed at different positions of the bracket, so that projections on the bottom plate form a triangle, and three-point fixation is realized.
The first extension part and the second extension part are cantilever structures, the cantilevers forming the first extension part and the cantilevers forming the second extension part are opposite in the direction perpendicular to the bottom plate, the contact parts are positioned at the end parts of the cantilevers, and the number of the pressing mechanisms is equal to that of the contact parts. The cantilever structure is simple in form and convenient to process, the number of the pressing mechanisms is equal to that of the contact parts, each pressing mechanism correspondingly presses and fixes one contact part, and the fixing effect is good.
Drawings
Fig. 1 is a schematic structural view of embodiment 1 of the circuit breaker of the present utility model;
fig. 2 is a schematic structural view of a sensor fixing device of embodiment 1 of the circuit breaker of the present utility model.
Each mark in the figure: 1. a bracket; 2. a fixed arm; 3. a hold-down arm; 4. a screw; 5. nylon sleeve; 6. a fixing seat; 7. a bottom plate; 8. a sensor; 9. a main support arm.
Detailed Description
Embodiments of the present utility model will be further described with reference to the accompanying drawings.
As shown in fig. 1 and 2, an embodiment 1 of the circuit breaker of the present utility model includes a base plate 7, a sensor fixing device is fixedly arranged on the base plate 7, the sensor fixing device includes a bracket 1, a fixing seat 6 is detachably fixed on the bracket 1 through bolts, the fixing seat 6 is used for fixing and installing a sensor 8, the fixing seat 6 and the bracket 1 are separately arranged and detachably fixed, so that the fixing seat 6 is convenient to maintain and replace, and in other embodiments, the fixing seat 6 and the bracket 1 can be integrally formed.
The support 1 includes a main support arm 9 extending in a direction perpendicular to the bottom plate 7, two ends of the main support arm 9 are respectively located at two sides of the bottom plate 7, a first extending portion and a second extending portion extending perpendicular to the main support arm 9 are further respectively arranged on two sides of the bottom plate 7 on the main support arm 9, in this embodiment, the first extending portion is a fixing arm 2, the second extending portion is a pressing arm 3, and the fixing arm 2 and the pressing arm 3 are both cantilever structures, so that the structure of the support 1 can be simplified. Two fixing arms 2 and two pressing arms 3 are respectively arranged, one of the two fixing arms 2 is integrally arranged with the main support 9, and the other fixing arm is separately arranged with the main support 9; one of the two pressing arms 3 is integrally arranged with the main support arm 9, the other pressing arm 3 is arranged separately from the main support arm 9, and the fixed arm 2 and the pressing arm 3 are arranged opposite to each other in the direction perpendicular to the bottom plate 7. The fixing seat 6 is arranged on the main support 9, so that the projection of the fixing seat 6 on the bottom plate 7 and the projection of the fixing arm 2 and the pressing arm 3 on the bottom plate 7 form a triangle.
The end of the fixed arm 2 of the bracket 1 forms a contact part for compressing and fixing with the bottom plate 7, and the bracket 1 is also provided with a compressing mechanism for compressing and fixing the fixed arm 2 with the bottom plate 7, in this embodiment, the compressing mechanism drives the compressing end thereof to do linear motion through threads so as to compress the contact part with the bottom plate 7. The compressing mechanism comprises a threaded hole formed in the compressing arm 3 and a screw 4 matched with the threaded hole, the threaded hole extends along the direction perpendicular to the bottom plate 7, and the compressing end of the compressing mechanism is arranged at the end part of the screw 4. In this embodiment, the end of the screw 4 near the bottom plate 7 is provided with a nylon sleeve 5, the nylon sleeve 5 forms a compressing end of the compressing mechanism, and the nylon sleeve 5 can play a role in buffering the contact between the screw 4 and the bottom plate 7. The number of the pressing mechanisms is the same as that of the contact parts, namely, one pressing mechanism is arranged on each of the two pressing arms 3, so that the pressing and fixing effects on the fixing arms 2 and the bottom plate 7 can be enhanced.
When the circuit breaker is used, the sensor 8 is arranged on the fixed seat 6, the nylon sleeve 5 is sleeved at the end part of the screw 4, the screw 4 is screwed, and under the action of the threaded hole of the pressing arm 3, the screw 4 moves in the axial direction and the nylon sleeve 5 presses the bottom plate 7 and the fixed arm 2; the sensor 8 is fixedly connected with the pull rod of the circuit breaker through the connecting piece, three-point fixation is realized between the sensor fixing device and the circuit breaker through the two fixing arms 2 and the sensor, the stable effect is achieved, the displacement of the sensor fixing device caused by severe vibration during opening and closing of the circuit breaker can be reduced, the accuracy of a test result is ensured, the inclination angle of the sensor fixing device is reduced, the friction and the impact of the bottom plate and the sensor fixing device are reduced, the deformation of the sensor fixing device is reduced, and the service life of the sensor fixing device is prolonged.
Example 2 of the circuit breaker of the present utility model is different from example 1 in that: in the embodiment 1, the compressing mechanism drives the compressing end to do linear motion through the screw thread, and in the embodiment, the compressing mechanism can also drive the compressing end to do linear motion through a hydraulic cylinder or a telescopic rod of the cylinder.
Example 3 of the circuit breaker of the present utility model differs from example 1 in that: in embodiment 1, the compressing end of the compressing mechanism moves linearly, in this embodiment, a cam is rotatably mounted on the compressing arm, the cam can compress the bottom plate and the fixing arm in the rotating process, the cam forms the compressing end, and the compressing end rotates to compress and fix the bottom plate and the fixing arm.
Example 4 of the circuit breaker of the present utility model differs from example 1 in that: in the embodiment 1, the pressing mechanism includes a threaded hole on the pressing arm and a threaded rod in the threaded hole, in this embodiment, the threaded hole on the pressing arm may be omitted, the screw rod is rotationally assembled on the pressing arm, the threaded rod is assembled with a threaded sleeve, the threaded sleeve is rotationally matched with the pressing arm, and when the screw rod is rotated, the threaded sleeve directly rotates to press the bottom plate and the fixing arm, and the threaded sleeve forms a pressing end.
Example 5 of the circuit breaker of the present utility model differs from example 1 in that: in the embodiment 1, the first extension portion and the second extension portion have cantilever structures, in this embodiment, the first extension portion and the second extension portion may also be plates, the end surface of the plate of the first extension portion contacts the bottom plate to form a contact portion, and the plate of the second extension portion is provided with a threaded hole.
The utility model also provides an embodiment of the sensor fixing device for the circuit breaker, and the specific structure of the sensor fixing device is the same as that of any embodiment of the circuit breaker, and is not repeated here.
Claims (10)
1. The circuit breaker, its characterized in that: the sensor fixing device comprises a bracket, wherein the bracket is provided with at least two contact parts for compressing and fixing the bottom plate, the bracket or the bottom plate is provided with a compressing mechanism for compressing and fixing the contact parts and the bottom plate, and the bracket is also provided with a fixing seat for fixing a sensor, and the fixing seat and the projection of the two contact parts on the bottom plate form a triangle; the compressing mechanism comprises a threaded hole which is arranged on the bracket and extends along the direction vertical to the bottom plate, and a screw rod which is matched with the threaded hole, and the compressing end of the compressing mechanism is positioned at one end part of the screw rod; the support comprises a main support arm extending in the direction perpendicular to the bottom plate, two ends of the main support arm are respectively located at two sides of the bottom plate, a first extending part and a second extending part extending perpendicular to the main support arm are respectively arranged on two sides of the bottom plate, the contact part is arranged on the first extending part, the screw is screwed on the second extending part, and the fixing base is located on the main support arm.
2. The circuit breaker according to claim 1, characterized in that: the compressing end of the compressing mechanism moves linearly along the direction vertical to the bottom plate so as to compress the contact part and the bottom plate.
3. The circuit breaker according to claim 2, characterized in that: the compressing mechanism drives the compressing end to do linear motion through threads.
4. The circuit breaker according to claim 1, characterized in that: the end part of the screw rod, which is close to the bottom plate, is sleeved with a nylon sleeve, and the nylon sleeve forms the compression end.
5. The circuit breaker according to claim 1, characterized in that: the first extension part and the second extension part are cantilever structures, the cantilevers forming the first extension part and the cantilevers forming the second extension part are opposite in the direction perpendicular to the bottom plate, the contact parts are positioned at the end parts of the cantilevers, and the number of the pressing mechanisms is equal to that of the contact parts.
6. Sensor fixing device for circuit breaker, its characterized in that: the circuit breaker comprises a bracket, wherein the bracket is provided with at least two contact parts for being pressed and fixed with a bottom plate of the circuit breaker, a pressing mechanism for pressing and fixing the contact parts and the bottom plate is arranged on the bracket, a fixing seat for fixing a sensor is also arranged on the bracket, and the fixing seat and projections of the two contact parts on the bottom plate form a triangle; the compressing mechanism comprises a threaded hole which is arranged on the bracket and extends along the direction vertical to the bottom plate, and a screw rod which is matched with the threaded hole, and the compressing end of the compressing mechanism is positioned at one end part of the screw rod; the support comprises a main support arm extending in the direction perpendicular to the bottom plate, two ends of the main support arm are respectively located at two sides of the bottom plate, a first extending part and a second extending part extending perpendicular to the main support arm are respectively arranged on two sides of the bottom plate, the contact part is arranged on the first extending part, the screw is screwed on the second extending part, and the fixing base is located on the main support arm.
7. The sensor holder for a circuit breaker according to claim 6, wherein: the compressing end of the compressing mechanism moves linearly along the direction vertical to the bottom plate so as to compress the contact part and the bottom plate.
8. The sensor holder for a circuit breaker according to claim 7, wherein: the compressing mechanism drives the compressing end to do linear motion through threads.
9. The sensor holder for a circuit breaker according to claim 6, wherein: the end part of the screw rod, which is close to the bottom plate, is sleeved with a nylon sleeve, and the nylon sleeve forms the compression end.
10. The sensor holder for a circuit breaker according to claim 6, wherein: the first extension part and the second extension part are cantilever structures, the cantilevers forming the first extension part and the cantilevers forming the second extension part are opposite in the direction perpendicular to the bottom plate, the contact parts are positioned at the end parts of the cantilevers, and the number of the pressing mechanisms is equal to that of the contact parts.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810434214.8A CN108444688B (en) | 2018-05-08 | 2018-05-08 | Circuit breaker and sensor fixing device for circuit breaker |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810434214.8A CN108444688B (en) | 2018-05-08 | 2018-05-08 | Circuit breaker and sensor fixing device for circuit breaker |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN108444688A CN108444688A (en) | 2018-08-24 |
| CN108444688B true CN108444688B (en) | 2023-11-28 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810434214.8A Active CN108444688B (en) | 2018-05-08 | 2018-05-08 | Circuit breaker and sensor fixing device for circuit breaker |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN108444688B (en) |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1103059A1 (en) * | 1998-08-06 | 2001-05-30 | ABB T&D Technology Ltd. | Pole of a circuit breaker with an integrated optical current sensor |
| CN201740539U (en) * | 2010-05-25 | 2011-02-09 | 安徽龙波电气有限公司 | Testing support |
| CN104142230A (en) * | 2013-11-30 | 2014-11-12 | 国家电网公司 | Device for testing mechanical characteristics of circuit breaker |
| CN106197196A (en) * | 2016-08-10 | 2016-12-07 | 安徽中电兴发与鑫龙科技股份有限公司 | A kind of chopper displacement transducer support means |
| CN205981634U (en) * | 2016-07-22 | 2017-02-22 | 新疆特变电工自控设备有限公司 | Circuit breaker mechanical property test fixture |
| CN206095609U (en) * | 2016-09-20 | 2017-04-12 | 国家电网公司 | A sensor fixed device for circuit breaker speed measuring in -process |
| CN107036794A (en) * | 2017-04-27 | 2017-08-11 | 国家电网公司 | A kind of second generation rectilinear transducer mounting bracket |
| CN107063536A (en) * | 2016-12-21 | 2017-08-18 | 河南平高电气股份有限公司 | Breaker torque transmission shaft measurement apparatus |
| CN107742600A (en) * | 2017-11-21 | 2018-02-27 | 乾友科技有限公司 | A kind of automatic breaking-closing operating device of breaker and its breaker |
| CN208254779U (en) * | 2018-05-08 | 2018-12-18 | 河南森源电气股份有限公司 | A kind of breaker and breaker sensor fastening device |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| AUPQ672300A0 (en) * | 2000-04-05 | 2000-05-04 | Nu-Lec Industries Pty Limited | Isolating circuit breaker and circuit protection arrangement |
| US7511229B2 (en) * | 2005-06-02 | 2009-03-31 | Liebert Corporation | Sensor module, system, and method for sensors in proximity to circuit breakers |
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2018
- 2018-05-08 CN CN201810434214.8A patent/CN108444688B/en active Active
Patent Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1103059A1 (en) * | 1998-08-06 | 2001-05-30 | ABB T&D Technology Ltd. | Pole of a circuit breaker with an integrated optical current sensor |
| CN201740539U (en) * | 2010-05-25 | 2011-02-09 | 安徽龙波电气有限公司 | Testing support |
| CN104142230A (en) * | 2013-11-30 | 2014-11-12 | 国家电网公司 | Device for testing mechanical characteristics of circuit breaker |
| CN205981634U (en) * | 2016-07-22 | 2017-02-22 | 新疆特变电工自控设备有限公司 | Circuit breaker mechanical property test fixture |
| CN106197196A (en) * | 2016-08-10 | 2016-12-07 | 安徽中电兴发与鑫龙科技股份有限公司 | A kind of chopper displacement transducer support means |
| CN206095609U (en) * | 2016-09-20 | 2017-04-12 | 国家电网公司 | A sensor fixed device for circuit breaker speed measuring in -process |
| CN107063536A (en) * | 2016-12-21 | 2017-08-18 | 河南平高电气股份有限公司 | Breaker torque transmission shaft measurement apparatus |
| CN107036794A (en) * | 2017-04-27 | 2017-08-11 | 国家电网公司 | A kind of second generation rectilinear transducer mounting bracket |
| CN107742600A (en) * | 2017-11-21 | 2018-02-27 | 乾友科技有限公司 | A kind of automatic breaking-closing operating device of breaker and its breaker |
| CN208254779U (en) * | 2018-05-08 | 2018-12-18 | 河南森源电气股份有限公司 | A kind of breaker and breaker sensor fastening device |
Also Published As
| Publication number | Publication date |
|---|---|
| CN108444688A (en) | 2018-08-24 |
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