CN216588957U - Fan clearance measuring equipment based on camera orientation and laser ranging - Google Patents
Fan clearance measuring equipment based on camera orientation and laser ranging Download PDFInfo
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- CN216588957U CN216588957U CN202122484361.6U CN202122484361U CN216588957U CN 216588957 U CN216588957 U CN 216588957U CN 202122484361 U CN202122484361 U CN 202122484361U CN 216588957 U CN216588957 U CN 216588957U
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Abstract
The utility model provides fan clearance measuring equipment based on camera orientation and laser ranging, which comprises a base positioned at the bottom of a fan cabin, wherein a deflection shaft is arranged on the base, two ends of the deflection shaft are respectively erected on a rotary table supporting rod, the deflection shaft is driven by a deflection motor, the deflection shaft is connected with a deflection platform, and an illuminating lamp, a high-speed camera and a laser range finder are arranged on the deflection platform; the high-speed camera is used for measuring the directions of the fan blade tip and the range finder; the laser range finder is used for ranging the fan blade tip, and the deflection platform is used for controlling the ranging angle of the laser range finder so that the laser spot of the laser range finder can be just hit at the position of the fan blade tip during ranging.
Description
Technical Field
The utility model belongs to the technical field of laser measurement, and particularly relates to fan clearance measurement equipment based on camera orientation and laser ranging.
Background
According to the statistical data of the Chinese energy bureau, the cumulative installed capacity of the Chinese wind power in 2019 reaches 21005 ten thousand kilowatts, and the installed capacity of the newly-added grid-connected wind power generation in China reaches 632 ten thousand kilowatts by the first half of 2020. In the foreseeable future energy development, wind power generation will continue to maintain a strong development momentum.
However, with the continuous increase of the installed capacity, new energy development safety accidents frequently occur in recent years, and when the wind force of the fan is strong, the fan blade is easy to deform. German Ship Classification (GL) wind turbine generator design and certification regulations: the minimum distance (namely clearance) between the blade tip of the wind turbine generator and the wall of the tower barrel is not less than 30% in the running state of the wind turbine generator and not less than 5% in the feathering shutdown state of the wind turbine generator relative to the distance between the blades in the non-deformation state. In order to avoid safety accidents caused by the fact that the blades collide with the tower cylinder, a laser radar clearance sensor is adopted to measure the clearance of the fan, the distance between the fan and the tower cylinder is sensed and early warned in advance, and the occurrence of risk accidents is avoided.
The method for measuring the clearance between the blade and the tower barrel in the industry at present is to arrange a plurality of laser scanners at the position, close to the lower blade tip of the blade, on the tower barrel along the radial direction by 360 degrees, wherein the laser scanners repeatedly and horizontally scan, and the minimum distance between the lower blade tip and the tower barrel is calculated by measuring the included angle and the distance between the laser and the blade in real time. The technology has a plurality of defects, firstly, a plurality of laser scanners are required to be arranged, and the laser scanners have angle and distance measuring functions and are expensive; secondly, the installation height of the laser scanner is the height of the lower leaf tip, the distance from the laser scanner to the ground is at least 20 meters, the installation and maintenance are inconvenient, and the cost is high; finally, because the laser is constantly in left-right scanning motion, the blade is also in motion, one moving object is used for measuring the other moving object, the sampling frequency is required to be very high, the method calculates the minimum distance in real time by measuring the included angle and the distance between the laser and the blade, and the data volume is very large. Meanwhile, the equipment can be influenced by extreme weather environments such as rain, fog, sand and dust, haze and low temperature, so that the monitoring function is invalid.
SUMMERY OF THE UTILITY MODEL
The utility model aims to overcome the defects in the prior art and provide fan clearance measuring equipment which is high in stability, strong in anti-interference capability and capable of completing high-precision clearance measuring tasks and is based on camera positioning and laser ranging.
The technical problem to be solved can be implemented by the following technical scheme.
The utility model provides a fan headroom measuring equipment based on camera orientation and laser rangefinder which characterized in that: the device comprises a base positioned at the bottom of a fan cabin, wherein a deflection shaft with two ends respectively erected on a rotary table supporting rod is arranged on the base, the deflection shaft is driven by a deflection motor and connected with a deflection platform, and an illuminating lamp, a high-speed camera and a laser range finder are arranged on the deflection platform; the high-speed camera is used for measuring the positions of the fan blade tip and the distance meter; the laser range finder is used for ranging the fan blade tips, and the deflection platform is used for controlling the ranging angle of the laser range finder so that the laser spots of the laser range finder can hit the fan blade tips in time of ranging.
As a further improvement of the technical scheme, the measuring frequency of the laser range finder is in the MHz level.
As a further improvement of the technical scheme, the wavelength of the emitted light of the laser range finder is in the range of the response wavelength of the detector of the high-speed camera.
As one of the preferred embodiments of the present invention, the illumination lamp is an illumination lamp with adjustable light intensity.
Further: the illumination lamp has an ambient light sensor for sensing the intensity of ambient light.
As a further improvement of the technical scheme, the high-speed camera has a contour recognition function.
And further, the base is arranged at the bottom of the fan cabin between the tower column and the fan blade.
By adopting the technical scheme, the fan clearance measuring equipment based on camera orientation and laser ranging is low in cost, simple in structure, high in stability, convenient to install and use and capable of effectively monitoring the clearance value in real time. Further, the measuring device has the following advantages and characteristics:
1. the laser range finder has high measuring frequency which can reach MHz (the current line scanning or surface scanning scheme is not more than 100Hz), quick response, strong anti-interference capability and long range finding, and can adapt to severe environments.
2. The laser range finder emits light with a wavelength within the response wavelength range of the telescope camera detector, and the telescope camera can shoot the laser range finder light spot and identify the position coordinates of the center of the laser range finder light spot on the target.
3. The background light can adjust the light intensity according to the ambient light, so that the target brightness is always kept in a proper range.
Drawings
FIG. 1 is a schematic diagram of a position of a wind turbine clearance measurement device of the present invention on a wind turbine;
FIG. 2 is a schematic structural diagram of a fan clearance measuring device based on camera-oriented laser ranging according to the present invention;
FIG. 3 is a schematic view of a clearance value between a fan blade tip and a tower column;
in the figure: 1. a tower column; 2. (blower) cabin; 3. a measurement module; 4. a fan blade; 5. a base; 6. a turntable support rod; 7. a yaw motor; 8. a yaw platform; 9. a laser range finder; 10. a high-speed camera; 11. an illuminating lamp; 12. a fan blade tip; 13. a yaw axis.
Detailed Description
The following describes embodiments of the present invention in further detail with reference to the accompanying drawings.
Referring to fig. 1 to 3, the utility model provides a fan clearance measuring device based on camera orientation and laser ranging, which comprises a laser range finder 9, a high-speed camera 10, a motor deflection table (i.e. a deflection platform 8) and an illuminating lamp 11; the high-speed camera 10 is used for measuring the directions of the fan blade tip 12 and the laser range finder 9, the motor deflection table adjusts the angle of the laser range finder according to the blade tip azimuth angle to enable the laser range finder to be aligned with the fan blade tip 12 for measurement, the laser range finder 9 measures the distance of the fan blade tip 12 and transmits the distance and azimuth angle data of the laser range finder to the central control system, and the distance between the fan blade tip 12 and the tower column 1 (namely the clear value d in fig. 3) is obtained through calculation. The utility model has compact structure, relatively low cost, high-precision clearance measurement and stronger environmental interference resistance.
The laser range finder 9, the high-speed camera 10, the illuminating lamp 11, the base 5, the turntable support rod 6, the deflection motor 7, the deflection platform 8 and the deflection shaft 13 form a measuring module 3 (refer to fig. 2), which is fixed at the bottom of the fan cabin 2 and is positioned between the fan blade 4 and the tower column 1.
A base 5 in the measuring module 3 is fixed on a fan cabin through screws; a deflection shaft 13 controlled by a deflection motor 7 is fixed above the base 5 through a turntable fixing column (namely, a turntable support rod 6). The deflection platform 8 swings by an angle under the driving of the deflection motor 7, and the swing angle is determined by the angle between the fan blade tip 12 measured by the camera and the laser range finder, so that the laser spot of the laser range finder just hits the position of the fan blade tip.
The field of view of the high-speed camera 10 covers the fan blade tip 12, the fan blade tip position is accurately positioned, the laser range finder light beam is located at the target center position through the deflection rotating table (namely the deflection platform 8), and the rotation and deflection angle is checked to be accurate or not through the camera measuring the laser range finder light spot center position.
As shown in FIG. 1, the fan clearance measurement module (i.e. measurement module 3) is installed below the cabin and rotates together with the cabin, so that the fan blade tip clearance value is monitored in real time.
When the fan rotates, the high-speed camera measures the shape of the blade tip of the fan, and the relative position of the blade tip and the direction of the distance meter are identified through corresponding software. The beat motor drives the beat platform adjustment laser range finder angle, makes it aim at the fan apex and measures, and the distance of fan apex is measured to the laser range finder, with the azimuth data of laser range finder convey control system together, obtains the distance of fan apex and column through calculating: a clear value (as shown in fig. 3).
Wherein, light 11 is used for the light filling when not enough to the fan apex can be shot to high-speed camera, and the light has ambient light sensor, and the light intensity is adjustable, and fan apex light intensity is all the time in suitable within range.
The high-speed camera has a contour recognition function, the response wavelength comprises the wavelength of the laser range finder, and the laser range finder can shoot a light spot image of the range finder and recognize the coordinates of the center position of the light spot.
And the high-speed camera judges whether the laser range finder aligns to the blade tip according to the light spot of the range finder and the profile position of the blade tip.
The camera identifies the light spot and the blade tip profile of the distance measuring instrument:
firstly, converting an image into a gray image, finding a proper threshold value of the image by using a maximum inter-class variance method, then carrying out binarization on the image, and extracting a light spot edge contour after the image binarization processing; mapping the tip coordinates of the fan in the contour to specific coordinate values in a world coordinate system; further processing can be performed by medium-short distance laser high-precision measurement software integrated in a computer.
Measuring the distance of the laser range finder:
the laser range finder uses a pulsed ToF ranging method, using a semiconductor laser emitter to emit infrared laser light, where the generated light bounces off the fan blade tip and returns to the laser radar (laser range finder). And measuring the distance between the blade tip and the laser radar (laser range finder) according to the time difference between the emission and the return of the light after reflection.
Claims (7)
1. The utility model provides a fan headroom measuring equipment based on camera orientation and laser rangefinder which characterized in that: the device comprises a base (5) positioned at the bottom of a fan cabin, wherein a deflection shaft (13) with two ends respectively erected on a rotary table supporting rod (6) is arranged on the base (5), the deflection shaft (13) is driven by a deflection motor (7), the deflection shaft (13) is connected with a deflection platform (8), and an illuminating lamp (11), a high-speed camera (10) and a laser range finder (9) are arranged on the deflection platform (8); the high-speed camera (10) is used for measuring the positions of the blade tip of the fan and the laser range finder (9); laser range finder (9) are used for carrying out the range finding to the fan apex, beat platform (8) are used for controlling the range finding angle of laser range finder (9) so that laser range finder laser facula just in time beat the fan apex position when finding the range.
2. The camera orientation and laser ranging based fan headroom measurement device of claim 1, wherein: the measuring frequency of the laser range finder (9) is MHz level.
3. The camera orientation and laser ranging based fan headroom measurement device of claim 1, wherein: the wavelength of the emitted light of the laser range finder (9) is within the detector response wavelength range of the high-speed camera (10).
4. The camera orientation and laser ranging based fan headroom measurement device of claim 1, wherein: the illuminating lamp (11) is an illuminating lamp with adjustable light intensity.
5. The camera orientation and laser ranging based wind turbine clearance measurement device of claim 1 or 4, wherein: the illumination lamp (11) is provided with an ambient light sensor for sensing the intensity of ambient light.
6. The camera orientation and laser ranging based fan headroom measurement device of claim 1, wherein: the high-speed camera (10) has a contour recognition function.
7. The camera orientation and laser ranging based fan headroom measurement device of claim 1, wherein: the base (5) is arranged at the bottom of the fan cabin between the tower column (1) and the fan blade (4).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122484361.6U CN216588957U (en) | 2021-10-15 | 2021-10-15 | Fan clearance measuring equipment based on camera orientation and laser ranging |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122484361.6U CN216588957U (en) | 2021-10-15 | 2021-10-15 | Fan clearance measuring equipment based on camera orientation and laser ranging |
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| Publication Number | Publication Date |
|---|---|
| CN216588957U true CN216588957U (en) | 2022-05-24 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202122484361.6U Active CN216588957U (en) | 2021-10-15 | 2021-10-15 | Fan clearance measuring equipment based on camera orientation and laser ranging |
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| CN (1) | CN216588957U (en) |
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2021
- 2021-10-15 CN CN202122484361.6U patent/CN216588957U/en active Active
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| Date | Code | Title | Description |
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| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CP01 | Change in the name or title of a patent holder |
Address after: 200233 No. 770, Xuhui District, Shanghai, Yishan Road Patentee after: Shanghai Laser Technology Research Institute Co.,Ltd. Address before: 200233 No. 770, Xuhui District, Shanghai, Yishan Road Patentee before: Shanghai Institute of Laser Technology |
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| CP01 | Change in the name or title of a patent holder | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20230328 Address after: 501-503, Floor 5, No. 12, 11th Road, Chaoyang Industrial Park, Xinzhou District, Shangrao City, Jiangxi Province, 334005 Patentee after: Jiangxi Shangke Jixing Optoelectronic Technology Co.,Ltd. Address before: 200233 No. 770, Xuhui District, Shanghai, Yishan Road Patentee before: Shanghai Laser Technology Research Institute Co.,Ltd. |
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| TR01 | Transfer of patent right |