CN114295100B - Wind turbine generator settlement monitoring device and monitoring method - Google Patents
Wind turbine generator settlement monitoring device and monitoring method Download PDFInfo
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- CN114295100B CN114295100B CN202111325713.1A CN202111325713A CN114295100B CN 114295100 B CN114295100 B CN 114295100B CN 202111325713 A CN202111325713 A CN 202111325713A CN 114295100 B CN114295100 B CN 114295100B
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- 238000012544 monitoring process Methods 0.000 title claims abstract description 61
- 238000012806 monitoring device Methods 0.000 title claims abstract description 12
- 238000000034 method Methods 0.000 title claims abstract description 10
- 238000013016 damping Methods 0.000 claims abstract description 9
- 238000004062 sedimentation Methods 0.000 claims description 11
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 9
- 238000009434 installation Methods 0.000 description 8
- 238000001514 detection method Methods 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000013480 data collection Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000002706 hydrostatic effect Effects 0.000 description 1
- 230000003116 impacting effect Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000010248 power generation Methods 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
Classifications
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/70—Wind energy
- Y02E10/72—Wind turbines with rotation axis in wind direction
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Abstract
The invention relates to the field of wind driven generators, and particularly discloses a settlement monitoring device and a settlement monitoring method for a wind turbine generator, wherein the settlement monitoring device comprises a monitoring column and a reflector arranged on the wind turbine generator, the monitoring column is arranged around the wind turbine generator along the circumferential direction of the wind turbine generator, the monitoring column comprises a column body, a base and an adjusting mechanism, a leveling instrument and a control module are arranged in the column body, the leveling instrument is electrically connected with the control module, a laser sensor is arranged on the outer wall of the column body, the laser sensor is electrically connected with the control module, and the reflector can reflect laser; the adjusting mechanism is arranged on the base and comprises an adjusting seat and an adjusting shaft, the damping rotation of the adjusting shaft is arranged on the adjusting seat, the adjusting shaft is connected with the column body, a driving motor is arranged on the adjusting seat, and the output end of the driving motor is connected with one end of the adjusting shaft. The invention aims to solve the technical problem of low settlement monitoring accuracy of a real-time wind driven generator.
Description
Technical Field
The invention relates to the field of wind turbines, and particularly discloses a device and a method for monitoring sedimentation of a wind turbine.
Background
Wind power generation is a renewable energy source advocated by China, a unit of the wind power generator is influenced by wind power all the year round, and the unit, a foundation and the like can incline and subside to different degrees. The sedimentation monitoring method in the prior art generally adopts national second-level measurement for detection.
However, the prior art has the problems of high manual detection cost, low efficiency, low accuracy and incapability of monitoring in real time. The automatic monitoring device in the prior art needs to be arranged on the unit, the original structure of the unit can be possibly damaged, the unit inclination angle is small in a short time, the equipment accuracy of the hydrostatic leveling instrument and the like is insufficient, the inclination settlement condition can not be monitored, the related equipment for laser monitoring needs to be arranged around the unit, and the device is suitable for monitoring the wind driven generator unit on land. For wind generating sets on water, the laser monitoring equipment can incline and subside under the action of water flow, so that inaccurate measurement is caused.
Disclosure of Invention
Therefore, the invention aims to provide a wind turbine generator settlement monitoring device and a monitoring method, so as to solve the technical problem of low settlement monitoring accuracy of a real-time wind turbine generator.
In order to achieve the above purpose, the present invention provides the following technical solutions:
the wind turbine sedimentation monitoring device comprises a monitoring column and a reflector arranged on the wind turbine, wherein the monitoring column is arranged around the wind turbine along the circumferential direction of the wind turbine, the monitoring column comprises a column body, a base and an adjusting mechanism, a leveling instrument and a control module are arranged in the column body, the leveling instrument is electrically connected with the control module, a laser sensor is arranged on the outer wall of the column body, the laser sensor is electrically connected with the control module, and the reflector can reflect laser; the adjusting mechanism is arranged on the base and comprises an adjusting seat and an adjusting shaft, the damping rotation of the adjusting shaft is arranged on the adjusting seat, the adjusting shaft is connected with the column body, a driving motor is arranged on the adjusting seat, and the output end of the driving motor is connected with one end of the adjusting shaft.
The utility model discloses a monitor post and reflector in this scheme, wherein the fixed setting of reflector is on wind turbine generator system, the monitor post sets up in aqueous, the monitor post includes post body and adjustment mechanism, wherein be provided with the leveling instrument in the post body, because the diameter of post body is less, the quality is lighter for wind turbine generator system, so its inclination is big when receiving rivers impact, adopt the leveling instrument can measure its inclination accurately, then the leveling instrument then can feed back information into control module, again by control module control driving motor rotation regulation axle, the regulating axle is connected with the post body, so driving motor can rotate the post body and make it resume vertical state, guarantee that the monitor post is when carrying out wind turbine generator system slope subsides monitoring, the data is accurate.
Optionally, a rotating hole is formed in the adjusting seat, a rotating shaft hole is formed in the rotating hole, a rotating shaft is arranged on the adjusting shaft, and the rotating shaft is connected in the rotating shaft hole in a damping and rotating mode. By adopting the scheme, the damping rotation of the rotating shaft is connected in the rotating shaft hole, so that when the column body is impacted by water flow, the column body can rotate to consume the energy of the water flow impact, and the inclination of the base of the monitoring column is avoided.
Optionally, a pawl ring is arranged in the rotation hole, the pawl ring comprises a ring body, a first pawl, a plurality of second pawls and a third pawl, a first installation groove, a second installation groove and a third installation groove are circumferentially arranged on the ring body, the first pawl is fixedly arranged in the first installation groove, the second pawl is rotatably arranged in the second installation groove, the third pawl is rotatably arranged in the third installation groove, the second pawl is connected with the second installation groove through a torsion spring, and the third pawl is also connected with the third installation groove through a torsion spring; the rotating shaft is provided with a ratchet wheel, the ratchet wheel is provided with a ratchet, and the ratchet wheel is matched with the pawl ring. By adopting the scheme, the second pawl and the third pawl which are connected through the torsion spring have restoring force, so that the second pawl and the third pawl can consume the impact force of the water flow received by the column body, and the base of the monitoring column is further prevented from being impacted to incline. The first pawl is fixedly arranged in the first mounting groove, and when the ratchet wheel on the adjusting shaft is meshed with the first pawl, the ratchet wheel cannot continue to rotate, so that the rotating angle of the adjusting shaft is limited, and the inclination of the column body of the monitoring column below the water surface is avoided.
Optionally, be provided with first fixed card hole on the third pawl, be provided with the fixed card hole of second in the third mounting groove, first fixed card hole aligns with the fixed card hole of second, be provided with the actuating cylinder in the rotation hole, the output of actuating cylinder can block into in first fixed card hole and the fixed card hole of second. By adopting the scheme, the column body is subjected to the water flow action for a long time, the column body can not be fixed by only depending on the reset of the driving motor, when the monitoring column needs to play a role in monitoring, the driving cylinder is started, the output end of the driving cylinder is inserted into the first fixing clamping hole and the second fixing clamping hole, the adjusting shaft is fixed on the adjusting seat, the column body can not rotate, the driving cylinder is reset after the monitoring data collection is completed, and the water flow impact energy is consumed by the mode of rotating and connecting the torsion spring and the damping.
Optionally, the driving cylinder and the driving motor are electrically connected with the control module. The control module can control the driving cylinder and the driving motor.
The monitoring method of the wind turbine sedimentation monitoring device comprises the following steps:
s1, measuring the inclined sedimentation condition of a monitoring column by a leveling instrument and sending a signal to a control module;
s2, starting a laser sensor when the monitoring column is not inclined, collecting laser information reflected by a reflector by the laser sensor, and monitoring the inclination and settlement condition of the wind turbine generator; when the monitoring column is inclined, a driving motor is started, the driving motor drives an adjusting shaft to rotate, and the adjusting shaft drives the column body to rotate to a vertical position;
s3, starting a driving cylinder, wherein the output end of the driving cylinder is clamped into the first fixing clamping hole and the second fixing clamping hole, and a pawl ring, a ratchet wheel and an adjusting shaft are fixed;
s4, starting a laser sensor, collecting laser information reflected by a reflector by the laser sensor, and monitoring the inclination settlement condition of the wind turbine generator;
s5, starting the driving cylinder, and retracting and exiting the first fixing clamping hole and the second fixing clamping hole by the output end of the driving cylinder.
The working principle and the beneficial effects of the scheme are as follows:
the monitoring structure in this scheme is including two states, not be used for monitoring wind turbine generator system slope condition, be used for monitoring wind turbine generator system slope condition two kinds, wherein when monitoring wind turbine generator system slope condition, the output of actuating cylinder inserts first fixed card hole and second fixed card hole, fixes the post body on the base, and the post body can't remove this moment, and can measure the slope condition of post body through the level gauge, can adjust the inclination of post body through actuating motor, guarantees that the post body can be in vertical state. Under the condition of not being used for detecting the inclination of the wind turbine generator, the output end of the driving cylinder is retracted, the water flow can incline when impacting the column body, impact energy is consumed, and therefore the base of the monitoring column is prevented from being inclined and settled under the stress.
Drawings
FIG. 1 is a schematic diagram of an embodiment;
FIG. 2 is a schematic view of the structure of the base, the interior of the adjustment seat and the column body;
FIG. 3 is a schematic structural view of an adjustment shaft;
FIG. 4 is a schematic view of the structure of the adjusting seat and the adjusting shaft;
FIG. 5 is a longitudinal cross-sectional view of a portion of the structure of the adjustment seat and adjustment shaft in a radial direction;
FIG. 6 is a longitudinal cross-sectional view of a portion of the construction of the third pawl;
fig. 7 is a schematic structural view of the first pawl, the second pawl, the third pawl and the pawl ring.
Reference numerals: the wind turbine generator system comprises a wind turbine generator system 1, a reflector 2, a base 3, an adjusting seat 4, an adjusting shaft 5, a column body 6, a leveling instrument 7, a laser sensor 8, a driving motor 9, a rotating hole 10, a mounting cavity 11, a rotating shaft 12, a ratchet 13, a ratchet 14, a rotating shaft hole 15, a pawl ring 16, a second pawl 17, a third pawl 18, a first fixing clamping hole 19, a first pawl 20, a driving cylinder 21, a third mounting groove 22, a first mounting groove 23, a second mounting groove 24, a torsion spring 25 and a second fixing clamping hole 26.
Detailed Description
In the description of the present embodiment, it should be noted that, if terms such as "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", "front", "rear", and the like are presented, the indicated orientation or positional relationship is based on the orientation or positional relationship shown in the drawings, only for convenience of describing the present invention and simplifying the description, and does not indicate or imply that the indicated apparatus or element must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present invention. Furthermore, the terms "first," "second," "third," and the like, as used herein, are used for descriptive purposes only and are not to be construed as indicating or implying any relative importance.
The invention is further described below with reference to the drawings and specific examples.
Examples:
a settlement monitoring structure of a wind turbine 1 is shown in fig. 1, and comprises a monitoring column and a reflector 2 arranged on the turbine, wherein the monitoring column is arranged around the turbine along the circumferential direction of the turbine.
With reference to fig. 2-5 (wherein the adjustment shaft 5 of fig. 4 is turned through 180 ° in order to show its structure); the monitoring column comprises a column body 6, a base 3 and an adjusting mechanism. The base 3 is arranged in an underwater stratum, the adjusting mechanism is arranged on the base 3 and comprises an adjusting seat 4 and an adjusting shaft 5, the adjusting seat 4 is fixedly arranged on the base 3, and the adjusting shaft 5 is arranged on the adjusting seat 4 in a damping rotation mode. The adjusting seat 4 is provided with a rotating hole 10, one side of the rotating hole 10 is provided with a mounting cavity 11, a driving motor 9 is fixedly arranged in the mounting cavity 11, the output end of the driving motor 9 is fixedly connected with the adjusting shaft 5 in a concentric manner, the other end of the adjusting shaft 5 is rotatably arranged in the rotating hole 10, a rotating shaft hole 15 is arranged in the rotating hole 10, the end part of the adjusting shaft 5 is fixedly provided with a rotating shaft 12 in a concentric manner, and the rotating shaft 12 is rotatably arranged in the rotating shaft hole 15 in a damping manner. A pawl ring 16 is fixedly arranged in the rotation hole 10 in a concentric manner, and the pawl ring 16 comprises a ring body, a first pawl 20, a plurality of second pawls 17 and a third pawl 18. The ring body is provided with a first mounting groove 23, a plurality of second mounting grooves 24 and a third mounting groove 22 along the upper circumference thereof, the first pawl 20 is fixedly arranged in the first mounting groove 23, the second pawl 17 is rotatably arranged in the second mounting groove 24 through a torsion spring 25, and the third pawl 18 is rotatably arranged in the third mounting groove 22 through the torsion spring 25. The rotating shaft 12 is concentrically and fixedly provided with a ratchet wheel 13, the ratchet wheel 13 is fixedly provided with only one ratchet wheel 14, and the ratchet wheel 13 is matched with the pawl ring 16. The specific connection mode of the second pawl 17 and the third pawl 18 is as follows: the second pawl 17 and the third pawl 18 are provided with circular shafts which are rotatably arranged in the second mounting groove 24 and the third mounting groove 22, one end of the torsion spring 25 is connected with the circular shafts, and the other end of the torsion spring 25 is connected with the second mounting groove 24/the third mounting groove 22.
Referring to fig. 6 to 7 (the upper ends and the front ends of the first, second and third mounting grooves 23, 24 and 22 in fig. 7 are opened to facilitate understanding of the internal structure thereof); the third pawl 18 and the circular shaft on the third pawl are provided with a first fixing and clamping hole 19, the first fixing and clamping hole 19 is eccentric with the circular shaft, the third mounting groove 22 is provided with a second fixing and clamping hole 26, the second fixing and clamping hole 26 penetrates through the rear side end of the third mounting groove 22, the first fixing and clamping hole 19 is aligned with the second fixing and clamping hole 26, the inner wall of the rotating hole 10 is provided with a driving cylinder 21, and the output end of the driving cylinder 21 can be clamped into the first fixing and clamping hole 19 and the second fixing and clamping hole 26.
The leveling instrument 7 and the control module are arranged in the column body 6, the leveling instrument 7 is electrically connected with the control module, the laser sensor 8 is arranged on the outer wall of the column body 6, the laser sensor 8 is electrically connected with the control module, and the reflector 2 can reflect laser. The driving cylinder 21 and the driving motor 9 are electrically connected with the control module. The control module can control the laser sensor 8, the driving motor 9 and the driving cylinder 21, and can also receive signals sent by the leveling instrument 7, and the leveling instrument 7 adopts a static leveling instrument 7.
When the monitoring column is required to monitor the inclination and settlement degree of the wind turbine 1, the monitoring method of the settlement monitoring structure of the wind turbine 1 comprises the following steps:
s1, measuring the inclined sedimentation condition of a monitoring column by a leveling instrument 7 and sending a signal to a control module;
s2, starting a laser sensor 8 when the monitoring column is not inclined, collecting laser information reflected by the reflector 2 by the laser sensor 8, and monitoring the inclination and settlement condition of the wind turbine generator system 1; when the monitoring column is inclined, a driving motor 9 is started, the driving motor 9 drives an adjusting shaft 5 to rotate, and the adjusting shaft 5 drives a column body 6 to rotate to a vertical position;
s3, starting the leveling instrument 7 again, monitoring the inclination of the monitoring column by the leveling instrument 7, starting the driving air cylinder 21 when the monitoring column is not inclined, and clamping the output end of the driving air cylinder 21 into the first fixing clamping hole 19 and the second fixing clamping hole 26 to fix the pawl ring 16, the ratchet wheel 13 and the adjusting shaft 5;
s4, starting a laser sensor 8, collecting laser information reflected by the reflector 2 by the laser sensor 8, and monitoring the inclination settlement condition of the wind turbine generator set 1;
s5, starting the driving cylinder 21, and withdrawing the output end of the driving cylinder 21 from the first fixing clamping hole 19 and the second fixing clamping hole 26.
The foregoing embodiments are provided for further explanation of the present invention and are not to be construed as limiting the scope of the present invention, and some insubstantial modifications and variations of the present invention, which are within the scope of the invention, will be suggested to those skilled in the art in light of the foregoing teachings.
Claims (4)
1. The wind turbine sedimentation monitoring device comprises a monitoring column and a reflector arranged on the wind turbine, wherein the monitoring column is arranged around the wind turbine along the circumferential direction of the wind turbine, the monitoring column comprises a column body, a base and an adjusting mechanism, a leveling instrument and a control module are arranged in the column body, the leveling instrument is electrically connected with the control module, a laser sensor is arranged on the outer wall of the column body, the laser sensor is electrically connected with the control module, and the reflector can reflect laser; the adjusting mechanism is arranged on the base, the adjusting mechanism comprises an adjusting seat and an adjusting shaft, the adjusting shaft is rotationally arranged on the adjusting seat in a damping manner, the adjusting shaft is connected with the column body, a driving motor is arranged on the adjusting seat, the output end of the driving motor is connected with one end of the adjusting shaft, a rotating hole is formed in the adjusting seat, a rotating shaft hole is formed in the rotating hole, a rotating shaft is arranged on the adjusting shaft, and the rotating shaft is rotationally connected in the rotating shaft hole in a damping manner, and the adjusting mechanism is characterized in that: the rotating hole is internally provided with a pawl ring, the pawl ring comprises a ring body, a first pawl, a plurality of second pawls and a third pawl, a first mounting groove, a second mounting groove and a third mounting groove are formed in the ring body along the circumferential direction, the first pawl is fixedly arranged in the first mounting groove, the second pawl is rotatably arranged in the second mounting groove, the third pawl is rotatably arranged in the third mounting groove, the second pawl is connected with the second mounting groove through a torsion spring, and the third pawl is also connected with the third mounting groove through the torsion spring; the rotating shaft is provided with a ratchet wheel, the ratchet wheel is provided with a ratchet, and the ratchet wheel is matched with the pawl ring.
2. The wind turbine sedimentation monitoring device of claim 1, wherein: the third pawl is provided with a first fixed clamping hole, the third mounting groove is provided with a second fixed clamping hole, the first fixed clamping hole is aligned with the second fixed clamping hole, the rotating hole is provided with a driving cylinder, and the output end of the driving cylinder can be clamped into the first fixed clamping hole and the second fixed clamping hole.
3. The wind turbine sedimentation monitoring device of claim 2, wherein: the driving cylinder and the driving motor are electrically connected with the control module.
4. A method for monitoring a sedimentation monitoring device of a wind turbine according to claim 3, wherein: the monitoring method comprises the following steps:
s1, measuring the inclined sedimentation condition of a monitoring column by a leveling instrument and sending a signal to a control module;
s2, starting a laser sensor when the monitoring column is not inclined, collecting laser information reflected by a reflector by the laser sensor, and monitoring the inclination and settlement condition of the wind turbine generator; when the monitoring column is inclined, a driving motor is started, the driving motor drives an adjusting shaft to rotate, and the adjusting shaft drives the column body to rotate to a vertical position;
s3, starting a driving cylinder, wherein the output end of the driving cylinder is clamped into the first fixing clamping hole and the second fixing clamping hole, and a pawl ring, a ratchet wheel and an adjusting shaft are fixed;
s4, starting a laser sensor, collecting laser information reflected by a reflector by the laser sensor, and monitoring the inclination settlement condition of the wind turbine generator;
s5, starting the driving cylinder, and retracting and exiting the first fixing clamping hole and the second fixing clamping hole by the output end of the driving cylinder.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111325713.1A CN114295100B (en) | 2021-11-10 | 2021-11-10 | Wind turbine generator settlement monitoring device and monitoring method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111325713.1A CN114295100B (en) | 2021-11-10 | 2021-11-10 | Wind turbine generator settlement monitoring device and monitoring method |
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| Publication Number | Publication Date |
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| CN114295100A CN114295100A (en) | 2022-04-08 |
| CN114295100B true CN114295100B (en) | 2023-12-05 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202111325713.1A Active CN114295100B (en) | 2021-11-10 | 2021-11-10 | Wind turbine generator settlement monitoring device and monitoring method |
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Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN117514647B (en) * | 2023-11-22 | 2024-07-26 | 江苏海龙风电科技股份有限公司 | Offshore wind power installation platform inclination monitoring system |
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| JP2004232434A (en) * | 2003-02-03 | 2004-08-19 | Toa Harbor Works Co Ltd | Control method for height of placing or scattering out sediment |
| KR101318257B1 (en) * | 2013-05-02 | 2013-10-15 | 주식회사 대한지오매틱스 | Total geographic point and level point information gathering system for applying results of the geographical observation data |
| CN105370506A (en) * | 2015-11-16 | 2016-03-02 | 华北电力大学 | Device for monitoring inclination and settlement of tower of wind generation set |
| JP2019073999A (en) * | 2017-10-13 | 2019-05-16 | 三菱重工業株式会社 | Inspection system of wind turbine generator system using flying body and inspection method |
| CN211504094U (en) * | 2020-04-07 | 2020-09-15 | 南京福斯特新能源科技有限公司 | Wind turbine generator system tower section of thick bamboo settlement monitoring facilities |
| CN113091702A (en) * | 2021-05-16 | 2021-07-09 | 河南和兴工程建设有限公司 | Road and bridge settlement difference real-time monitoring system and method thereof |
| CN213953814U (en) * | 2020-12-17 | 2021-08-13 | 华能昭觉风力发电有限公司 | Wind turbine generator system tower section of thick bamboo settlement monitoring devices |
-
2021
- 2021-11-10 CN CN202111325713.1A patent/CN114295100B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2004232434A (en) * | 2003-02-03 | 2004-08-19 | Toa Harbor Works Co Ltd | Control method for height of placing or scattering out sediment |
| KR101318257B1 (en) * | 2013-05-02 | 2013-10-15 | 주식회사 대한지오매틱스 | Total geographic point and level point information gathering system for applying results of the geographical observation data |
| CN105370506A (en) * | 2015-11-16 | 2016-03-02 | 华北电力大学 | Device for monitoring inclination and settlement of tower of wind generation set |
| JP2019073999A (en) * | 2017-10-13 | 2019-05-16 | 三菱重工業株式会社 | Inspection system of wind turbine generator system using flying body and inspection method |
| CN211504094U (en) * | 2020-04-07 | 2020-09-15 | 南京福斯特新能源科技有限公司 | Wind turbine generator system tower section of thick bamboo settlement monitoring facilities |
| CN213953814U (en) * | 2020-12-17 | 2021-08-13 | 华能昭觉风力发电有限公司 | Wind turbine generator system tower section of thick bamboo settlement monitoring devices |
| CN113091702A (en) * | 2021-05-16 | 2021-07-09 | 河南和兴工程建设有限公司 | Road and bridge settlement difference real-time monitoring system and method thereof |
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| CN114295100A (en) | 2022-04-08 |
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