CN106769020B - Photoelectric imaging type water turbine set peristaltic detection device and detection method - Google Patents
Photoelectric imaging type water turbine set peristaltic detection device and detection method Download PDFInfo
- Publication number
- CN106769020B CN106769020B CN201710027398.1A CN201710027398A CN106769020B CN 106769020 B CN106769020 B CN 106769020B CN 201710027398 A CN201710027398 A CN 201710027398A CN 106769020 B CN106769020 B CN 106769020B
- Authority
- CN
- China
- Prior art keywords
- fluted disc
- peristaltic
- edge
- detection
- water turbine
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
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
- G01M13/02—Gearings; Transmission mechanisms
- G01M13/021—Gearings
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M15/00—Testing of engines
- G01M15/02—Details or accessories of testing apparatus
-
- 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
- Y02E10/20—Hydro energy
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Length Measuring Devices By Optical Means (AREA)
Abstract
A peristaltic detection device and a peristaltic detection method for a photoelectric imaging type water turbine unit relate to the field of mechanical quantity measurement. The problem of peristaltic detection of the hydraulic turbine unit under the state of stopping is solved. The invention provides a non-contact type water turbine set peristaltic detection device and a method, wherein a special design fluted disc is arranged on a large shaft of the set, a fluted disc image is obtained through backlight illumination and photoelectric imaging, the straight line angle of the edge of a fluted disc convex tooth is obtained through an image processing method, and the peristaltic motion is effectively detected through the change of a calculated angle. Compared with the existing detection device and method, the device and method have the advantages of non-contact measurement, no scratch to a unit, direct and reliable detection of the fluted disc image extraction linear slope process, and high signal to noise ratio. The invention is convenient to implement and install, and needs few external accessories. The method is suitable for effectively monitoring the state of the water turbine unit and alarming in time after the water turbine unit is stopped.
Description
Technical Field
The invention relates to a problem of peristaltic detection in a shutdown state of a hydroelectric generating set, and belongs to the field of mechanical quantity measurement.
Background
In the shutdown state of the hydroelectric generating set, the guide vanes are not tightly closed, and the turbine runner is impacted by water flow, so that the set slowly rotates, namely, creeps. The peristaltic movement of the machine set is also called crawling, and the movement is very slow, so that human eyes can not distinguish in a short time. The creeping phenomenon belongs to the field of hydraulic mechanical faults and has great harm to the bearings of the unit. After the machine set is restarted, the bearings are easy to burn, so that the machine set is stopped due to reasons, the overhaul workload is large, and the cost is high. Therefore, the peristaltic phenomenon of the unit is hidden and not easy to be perceived, and great hidden danger is brought to the safe operation of the unit. Therefore, it is necessary to detect peristaltic faults of the unit, discover problems early, and take measures to eliminate possible damage caused by peristaltic faults.
The common peristaltic detection method of the water turbine unit comprises a PT residual pressure method, a mechanical wheel leaning method and a friction rod pneumatic method. The PT residual voltage method needs to detect voltage fluctuation generated by peristaltic motion, has weak signal and low signal-to-noise ratio, and has certain difficulty in detection. The mechanical wheel leaning method is characterized in that the wheel leaning wheel is contacted with a large shaft of the unit, a rotary encoder is connected to the wheel leaning wheel, the large shaft peristalsis brings the wheel leaning wheel to rotate, and the angle change can be detected through the rotary encoder. The friction rod pneumatic method is to drive a micro switch to detect peristaltic change through a friction rod contacted with a large shaft. The peristaltic movement is detected by the contact method, the large shaft of the unit is worn to a certain extent, and the relative sliding is easy to cause between the large shaft and the leaning wheel (or friction rod) when the unit runs for a long time, so that the peristaltic movement cannot be effectively detected.
Disclosure of Invention
The invention aims to solve the problem of peristaltic detection of a water turbine set in a shutdown state, and provides a photoelectric imaging type water turbine set peristaltic detection device and a detection method.
The peristaltic detection device comprises an imaging illumination light source, a fluted disc connected with a large shaft of a water turbine, an imaging lens, a diaphragm, an area array CCD and an image acquisition processing unit. The illumination light source irradiates the fluted disc from one side, the fluted disc is imaged on the CCD through the light path system of the other side, the fluted disc image generated by the CCD is identified by the image processing unit, and the change of the fluted disc position is judged, so that the peristaltic condition is effectively detected.
The peristaltic detection method provided by the invention comprises the following steps of:
(1) The illumination light source irradiates the fluted disc from one side, and the fluted disc is imaged on the area array CCD through the imaging lens and the diaphragm at the other side;
(2) The image of the area array CCD is acquired by an image acquisition processing unit;
(3) The image acquisition processing unit completes fluted disc image processing and peristaltic detection.
The detection process of the step (3) is as follows: searching the edge of the positioning convex tooth in the whole image in the initial processing execution; after the positioning is finished, setting an ROI (region of interest) on the edge of the positioning, wherein each subsequent image edge detection is performed on the ROI; after detecting the edge of the convex tooth each time, resetting the ROI with a new edge to prepare for the next edge detection; after the edge is detected in the ROI area, an edge straight line is extracted, so that a rectangular coordinate system equation of the straight line can be determined, and the slope of the straight line is calculated; and judging the peristaltic condition according to the change of the slope of the straight line and outputting a result.
According to the peristaltic detection device and method for the water turbine unit, provided by the invention, the position change of the fluted disc can be detected in an optical imaging mode, and the detection way is direct and reliable; belongs to non-contact measurement, and can not scratch a large shaft of a unit and have any influence on the unit. The large shaft of the water turbine unit which is arranged vertically or horizontally is arranged in a closed way, so that the condition of the illumination light source is good, and no other stray light interference exists; the turbine unit is generally provided with a fluted disc, and the rotation speed of the unit is measured through a rotation speed sensor arranged on an external bracket. The detection device can share the same bracket with the rotating speed sensor, and no extra resource occupation is generated.
Drawings
FIG. 1 is a schematic diagram of a peristaltic detection device of a water turbine set;
FIG. 2 is a diagram of a creep detection toothed disc;
FIG. 3 is a view of a peristaltic detection device mounting bracket;
fig. 4 is a schematic diagram of fluted disc image processing.
Detailed Description
Referring to fig. 1, fig. 2, and fig. 3, an embodiment of a peristaltic detection device of a photoelectric imaging water turbine set includes:
the photoelectric imaging type peristaltic detection device for the water turbine unit comprises an imaging illumination light source (1), a fluted disc (2) connected with a large shaft of the water turbine, an imaging lens (3), a diaphragm (4), an area array CCD (5) and an image acquisition processing unit (6), wherein the imaging illumination light source is shown in figure 1. The illumination light source (1) adopts backlight illumination, the fluted disc (2) is coaxially arranged with the large shaft of the machine set, and the light source (1) irradiates convex teeth distributed on the edge of the fluted disc (2) from one side of the fluted disc (2). On the other side of the fluted disc (2), convex teeth distributed on the edge of the fluted disc (2) are imaged on the area array CCD (5) by the imaging lens (3) and the diaphragm (4). The diaphragm (4) is arranged at the image space focal plane of the lens (3) and forms an object space telecentric light path for the aperture diaphragm of the system. The lens (3), the diaphragm (4) and the CCD (5) are coaxially arranged and are perpendicular to the large axis of the unit. An image acquisition processing unit (6) acquires the CCD (5) image and processes the image to obtain a corresponding detection result. The image acquisition processing unit can be realized by an FPGA and DSP framework, the FPGA is used for completing the real-time acquisition of the image, and the DSP is used for completing the image processing algorithm and the output of the detection result.
In the second embodiment, as shown in fig. 2, the circumference of the fluted disc (7) is composed of 60 convex teeth (8), and the angle occupied by each convex tooth (8) is 3 degrees. The two edge extension lines of each convex tooth (8) of the fluted disc (7) pass through the circle center of the fluted disc (7), the outer diameter of the fluted disc (7) is determined by the diameter of the large shaft of the water turbine unit, and the fluted disc is connected with the large shaft flange of the unit together through the mounting hole (9). The fluted disc (7) can also be used for measuring the rotating speed of the unit.
In the third embodiment, the peristaltic detection device of the unit and the rotational speed measurement device of the unit can be installed on the same bracket (11), as shown in fig. 3, so as to form a combined measurement system. The rotating speed sensor (12) is positioned in the middle of the bracket (11), and the pulse generated by the convex teeth on the fluted disc (10) is detected through the magneto-electric sensor. Peristaltic detection devices (13) are arranged on two sides of the bracket (11). In the running process of the unit, the speed is measured by a rotation speed sensor, and in the shutdown state, the peristaltic condition of the unit is detected by a peristaltic detection device.
Referring to fig. 1, 2 and 4, a peristaltic detection method and principle of a photoelectric imaging water turbine set are as follows:
1. the fluted disc (2) is rigidly connected with a large shaft of the unit, an illumination light source (1) irradiates the fluted disc (2) from one side of the fluted disc (2), and the fluted disc (2) is imaged on the CCD (5) through a lens (3) and a diaphragm (4) at the other side. Since the convex teeth (8) and the grooves are uniformly distributed at intervals on the edge of the fluted disc, the convex teeth (8) shield light rays, and a dark band is formed on the CCD (5); the grooves are transparent to light, which forms a bright band on the CCD (5). The peristaltic condition of the machine set can be effectively detected by detecting the position change of the edge of the dark band through image processing. The diaphragm (4) is arranged at the image space focal plane of the lens (3) to form an object space telecentric light path, and the telecentric light path can effectively reduce measurement errors caused by position variation of a measured object along the optical axis direction.
2. The fluted disc image is acquired by an image acquisition processing unit (6).
3. For the image of the toothed disc, as in fig. 4, the process is as follows. The edge (15) of the convex tooth is identified by an image processing edge detection method, and a straight line is fitted by edge points, namely, the straight line representing the edge (15) of the convex tooth is located. In the initial process, searching and positioning the edge (15) of the convex tooth in the whole image, and positioning the corresponding edge (15) of one convex tooth (16). In the subsequent detection processing, the ROI area (14) is set with a point on the edge as the center, and the subsequent processing is to detect and calculate the slope and angle of the straight line of the edge (15) in the ROI (14). The next detected ROI area (14) is reset from the newly detected line, thus dynamically setting the ROI (14), the ROI area (14) changing linearly with the edge (15). Since the peristaltic movement occurs slowly, the edge (15) does not exceed the set ROI area (14) in the next detection. The above processing can ensure that the change condition of the slope of the same straight line of the edge (15) is always detected.
The design of the fluted disc requires that the extension line of the convex tooth edge (15) passes through the circle center of the fluted disc, and the straight line represented by the edge (15) is detected, thus the slope of the straight line can be obtainedkAnd an angle alpha, of the formula wherein (x 1 ,y 1 ) And (x) 2 ,y 2 ) Coordinates of two points on a straight line respectively. By calculating the change in the angle of the straight line Δα=α 2 -α 1 The change condition of the fluted disc position can be obtained, and whether the creeping condition occurs or not can be judged.
The invention has the following advantages: the traditional PT residual voltage method is used for measuring peristalsis, the peristalsis is detected through measuring voltage change, the signal is weak, the interference is large, and the signal to noise ratio is low. The method directly measures fluted disc rotation generated by unit creep, signals are directly stable, and the unit is hermetically installed without interference light source, so that the signal-to-noise ratio is high. The traditional mechanical wheel-leaning method, friction rod pneumatic method and the like belong to contact measurement, scratch is easily generated on a large shaft of a unit, slipping is easily generated during long-term operation, and peristaltic movement cannot be effectively detected. The method belongs to non-contact measurement, does not have any influence on a unit, and the fluted disc is rigidly connected with the large shaft, so that peristaltic movement can be reliably detected. Furthermore, the method can share a fluted disc and a mounting bracket with the unit rotating speed measuring device, so that fewer additional parts are needed, and no extra resources are occupied.
Claims (1)
1. The detection method based on the photoelectric imaging type peristaltic detection device of the water turbine unit is characterized in that the photoelectric imaging type peristaltic detection device of the water turbine unit comprises an illumination light source, a fluted disc, an imaging lens, a diaphragm, an area array CCD and an image acquisition processing unit; the illumination light source generates visible light and projects the visible light on the fluted disc; the fluted disc is imaged on the CCD by an imaging lens and a diaphragm; the imaging lens and the diaphragm form an object space telecentric light path; the CCD is connected with the image acquisition processing unit; the circumference of the fluted disc comprises 60 convex teeth, and the angle occupied by each convex tooth is 3 degrees; the two edge extension lines of each convex tooth pass through the circle center of the fluted disc; the middle part of the fluted disc is provided with a mounting hole which can be connected with the flange plate;
the detection method comprises the following steps:
(1) The illumination light source irradiates the fluted disc from one side, and the fluted disc is imaged on the area array CCD through the imaging lens and the diaphragm at the other side;
(2) The image of the area array CCD is acquired by an image acquisition processing unit;
(3) The image acquisition processing unit completes fluted disc image processing and peristaltic detection;
the detection process of the step (3) is as follows: searching the edge of the positioning convex tooth in the whole image in the initial processing execution; after the positioning is finished, setting an ROI area at the edge of the positioning, and carrying out subsequent image edge detection at the ROI area every time; after detecting the edge of the convex tooth each time, resetting the ROI with a new edge to prepare for the next edge detection; after the edge is detected in the ROI area, an edge straight line is extracted, so that a rectangular coordinate system equation of the straight line can be determined, and the slope of the straight line is calculated; and judging the peristaltic condition according to the change of the slope of the straight line and outputting a result.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710027398.1A CN106769020B (en) | 2017-01-16 | 2017-01-16 | Photoelectric imaging type water turbine set peristaltic detection device and detection method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710027398.1A CN106769020B (en) | 2017-01-16 | 2017-01-16 | Photoelectric imaging type water turbine set peristaltic detection device and detection method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN106769020A CN106769020A (en) | 2017-05-31 |
| CN106769020B true CN106769020B (en) | 2023-08-15 |
Family
ID=58946993
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710027398.1A Active CN106769020B (en) | 2017-01-16 | 2017-01-16 | Photoelectric imaging type water turbine set peristaltic detection device and detection method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN106769020B (en) |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110824413A (en) * | 2018-08-10 | 2020-02-21 | 灵踪科技（深圳）有限公司 | Optical positioning device |
| CN110864629B (en) * | 2019-10-31 | 2021-08-27 | 西安交通大学 | Axial displacement measuring device and method applied to multi-friction-plate clutch |
| CN113252939B (en) * | 2021-05-13 | 2023-12-05 | 中国长江电力股份有限公司 | Peristaltic detection method and device for hydroelectric generating set based on image recognition technology |
| CN113357071B (en) * | 2021-05-13 | 2023-03-21 | 中国长江电力股份有限公司 | Barcode frequency measuring method and device for water turbine speed governor based on image recognition technology |
| CN114689288B (en) * | 2022-03-09 | 2023-06-13 | 中国长江电力股份有限公司 | System and method for measuring peristaltic movement of hydraulic generator by utilizing image monitoring |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201107043Y (en) * | 2007-12-03 | 2008-08-27 | 西安理工大学 | Non-contact type linear array CCD middle-low frequency shake measuring apparatus |
| CN201724944U (en) * | 2010-08-06 | 2011-01-26 | 天津水利电力机电研究所 | Intelligent rotate speed and peristalsis monitoring device |
| CN202353721U (en) * | 2011-12-05 | 2012-07-25 | 长江三峡能事达电气股份有限公司 | Water turbine spindle creep monitoring device |
| CN103149031A (en) * | 2013-04-02 | 2013-06-12 | 哈尔滨电机厂有限责任公司 | Computer-controlled synchronous digital type imaging method for observing flow state of model water turbine |
| CN103471529A (en) * | 2013-09-26 | 2013-12-25 | 中国科学院长春光学精密机械与物理研究所 | High-precision small photoelectricity angle sensor based on image processing |
-
2017
- 2017-01-16 CN CN201710027398.1A patent/CN106769020B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201107043Y (en) * | 2007-12-03 | 2008-08-27 | 西安理工大学 | Non-contact type linear array CCD middle-low frequency shake measuring apparatus |
| CN201724944U (en) * | 2010-08-06 | 2011-01-26 | 天津水利电力机电研究所 | Intelligent rotate speed and peristalsis monitoring device |
| CN202353721U (en) * | 2011-12-05 | 2012-07-25 | 长江三峡能事达电气股份有限公司 | Water turbine spindle creep monitoring device |
| CN103149031A (en) * | 2013-04-02 | 2013-06-12 | 哈尔滨电机厂有限责任公司 | Computer-controlled synchronous digital type imaging method for observing flow state of model water turbine |
| CN103471529A (en) * | 2013-09-26 | 2013-12-25 | 中国科学院长春光学精密机械与物理研究所 | High-precision small photoelectricity angle sensor based on image processing |
Also Published As
| Publication number | Publication date |
|---|---|
| CN106769020A (en) | 2017-05-31 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN106769020B (en) | Photoelectric imaging type water turbine set peristaltic detection device and detection method | |
| CN107764198B (en) | Engine stator blade axial gap light projection measuring device and method | |
| CN102192718B (en) | Determine the method for Contact Angle of Ball Bearings | |
| CN101537954B (en) | Elevator speed limiter detector | |
| CN203824546U (en) | Device for calibrating blade tip gap sensor | |
| CN104528508A (en) | Non-contact type escalator multi-parameter measuring method based on photoelectricity testing part | |
| CN211296482U (en) | Centrifuge motor control system | |
| CN205403703U (en) | Main shaft axle head detecting system that beats | |
| CN218002462U (en) | Dynamic deformation detection system of wind driven generator rotating shaft | |
| CN107378642A (en) | A kind of drilling and milling machine main shaft digital display velocity measurement mechanisms | |
| CN108593955A (en) | For moment rotatation speed test method in the case of cyclic irregularity | |
| CN202382939U (en) | Dynamic detection system of transmission errors of rotating shaft | |
| CN206695761U (en) | Utilize the gear projection type measuring device of computer | |
| CN206450415U (en) | A kind of photoelectronic imaging formula water turbine set Wriggle detecting device | |
| TWI747689B (en) | Intelligent vibration/temperature sensing device | |
| CN204422207U (en) | A kind of pick-up unit of gyration transmission accuracy | |
| JPS61161407A (en) | Fine gap measuring instrument | |
| CN104880155B (en) | Remote reference laser displacement transducer distance-finding method | |
| CN208805304U (en) | Hub unit sealing ring torque testing tooling | |
| CN208872766U (en) | A kind of speed probe | |
| CN208419873U (en) | Device for measuring place of strip material | |
| CN207571158U (en) | A kind of velocity-measuring system for rotary hearth furnace | |
| CN102998114B (en) | A kind of packaged type ABS gear detector | |
| CN107037412B (en) | A kind of automatic Angle Measuring System and method | |
| JPH04193047A (en) | Monitor for rotor coil end |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |