CN113418984A - Become oar bearing high strength steel crack detecting system - Google Patents
Become oar bearing high strength steel crack detecting system Download PDFInfo
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- CN113418984A CN113418984A CN202110897014.8A CN202110897014A CN113418984A CN 113418984 A CN113418984 A CN 113418984A CN 202110897014 A CN202110897014 A CN 202110897014A CN 113418984 A CN113418984 A CN 113418984A
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 17
- 239000010959 steel Substances 0.000 title claims abstract description 17
- 238000001514 detection method Methods 0.000 claims abstract description 49
- 239000000523 sample Substances 0.000 claims abstract description 45
- 238000006243 chemical reaction Methods 0.000 claims abstract description 18
- 238000001914 filtration Methods 0.000 claims abstract description 16
- 239000000758 substrate Substances 0.000 claims abstract description 16
- 230000005540 biological transmission Effects 0.000 claims abstract description 14
- 238000010586 diagram Methods 0.000 claims abstract description 8
- 230000003321 amplification Effects 0.000 claims abstract description 7
- 238000003199 nucleic acid amplification method Methods 0.000 claims abstract description 7
- 230000005284 excitation Effects 0.000 claims abstract description 6
- 238000000034 method Methods 0.000 abstract description 2
- 230000000694 effects Effects 0.000 description 6
- 230000005674 electromagnetic induction Effects 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 238000011179 visual inspection Methods 0.000 description 2
- 239000000306 component Substances 0.000 description 1
- 239000008358 core component Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
- G01N27/72—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating magnetic variables
- G01N27/82—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating magnetic variables for investigating the presence of flaws
- G01N27/90—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating magnetic variables for investigating the presence of flaws using eddy currents
- G01N27/9013—Arrangements for scanning
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
- G01N27/72—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating magnetic variables
- G01N27/82—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating magnetic variables for investigating the presence of flaws
- G01N27/90—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating magnetic variables for investigating the presence of flaws using eddy currents
- G01N27/904—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating magnetic variables for investigating the presence of flaws using eddy currents with two or more sensors
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Abstract
The invention provides a high-strength steel crack detection system of a variable-pitch bearing, which comprises a bearing substrate, wherein the surface of the bearing substrate is provided with a mounting seat, the surface of the mounting seat is provided with a driving motor, a motor shaft is horizontally arranged, the tail end of the motor shaft is fixedly provided with a mounting plate, the mounting plate is provided with a microcontroller, a sine signal generator and an eddy current probe, the device comprises a self-balancing circuit, a phase detection filtering module, an analog-to-digital conversion module and a wireless transmission module, wherein a sinusoidal signal generator generates a sinusoidal excitation signal to act on an eddy current probe, the eddy current probe excites an eddy current on the axial end face of a tested variable pitch bearing through a probe coil, the probe coil sends a crack impedance signal generated by eddy current change to the phase detection filtering module through the self-balancing circuit for amplification and filtering, the analog-to-digital conversion module acquires the crack impedance signal subjected to amplification and filtering, then sends the crack impedance signal into a micro-controller after analog-to-digital conversion, and the crack impedance signal is transmitted to a computer through the wireless transmission module to be processed to generate a crack impedance diagram. The method and the device can realize rapid and accurate detection of the cracks of the variable-pitch bearing.
Description
Technical Field
The invention relates to the technical field of variable pitch bearing crack detection, in particular to a high-strength steel crack detection system for a variable pitch bearing.
Background
The variable pitch is the process of changing the angle of the blade of the wind driven generator, and the variable pitch bearing is the bearing for the variable pitch mechanism. The variable pitch bearing is used for rotatably mounting blades on a hub, an inner ring of each blade is connected with the hub through a bolt, an outer ring of each blade is connected with the corresponding blade, and when the wind speed is too high or too low, the attack angle of airflow to the blades is changed by adjusting the pitch of the blades, so that the aerodynamic torque obtained by the wind generating set is changed, and the power output is kept stable. The variable pitch bearing is an important core component of a variable pitch control transmission system of the wind generating set, and because the size and the direction of the load acting on the blades are changed constantly along with time, the variable pitch bearing always bears the alternating load effect. The stress condition of the variable-pitch bearing is complex, and the bearing bears larger impact and vibration, so that the bearing is required to bear both impact and larger load.
The variable pitch bearing is used as one of key components of a transmission system of a large-scale wind generating set, the working environment is severe, various faults such as fracture and the like are easy to occur, once the variable pitch bearing fails, the realization of the control function and the operation safety of the whole set are directly influenced, the set stops working if the variable pitch bearing fails, and major safety accidents are caused if the variable pitch bearing fails, so that the detection of crack faults is necessary. However, the inventor of the application finds that the existing detection of the variable-pitch bearing generally adopts manual visual inspection, the effect of the detection completely depends on the experience of detection personnel, and therefore the detection efficiency is low and the detection result is inaccurate.
Disclosure of Invention
The invention provides a high-strength steel crack detection system for a variable pitch bearing, aiming at the technical problems that the detection efficiency is low and the detection result is inaccurate because the existing variable pitch bearing is generally detected by manual visual inspection and the effect completely depends on the experience of detection personnel.
In order to solve the technical problems, the invention adopts the following technical scheme:
a high-strength steel crack detection system for a pitch bearing comprises a bearing substrate, wherein a mounting seat is arranged on the surface of the bearing substrate, a driving motor is fixedly mounted on the surface of the mounting seat, a motor shaft of the driving motor is horizontally arranged, the tail end of the motor shaft is fixedly connected with a mounting plate, a microcontroller, a sinusoidal signal generator, an eddy current probe, a self-balancing circuit, a phase detection filtering module, an analog-to-digital conversion module and a wireless transmission module are arranged on the mounting plate, the sinusoidal signal generator generates a sinusoidal excitation signal under the control of the microcontroller to act on the eddy current probe, the eddy current probe is opposite to the axial end face of a fixedly arranged tested pitch bearing, the eddy current probe excites eddy current on the axial end face of the tested pitch bearing through a probe coil, the probe coil sends crack impedance signals generated by eddy current change to the phase detection filtering module through the self-balancing circuit to be amplified and filtered, the analog-digital conversion module acquires the amplified and filtered crack impedance signals, performs analog-digital conversion on the amplified and filtered crack impedance signals and then sends the amplified and filtered crack impedance signals to the micro-controller, and the wireless transmission module is connected with the micro-controller and wirelessly transmits the crack impedance signals to the computer for processing to generate a crack impedance diagram.
Compared with the prior art, when the high-strength steel crack detection system for the pitch bearing provided by the invention works, the driving motor is started firstly, the eddy current probe on the mounting plate is driven by the motor shaft to rotate, eddy current flaw detection scanning detection is carried out on the axial end face of the measured pitch bearing through the rotating eddy current probe, specifically, a sine excitation signal is generated by the sine signal generator to act on the eddy current probe, the eddy current probe establishes an alternating magnetic field through a probe coil arranged on the eddy current probe, the alternating magnetic field generates an electromagnetic induction effect with the measured pitch bearing through the measured pitch bearing, an eddy current is formed on the surface of the measured pitch bearing, when cracks appear on the surface of the measured pitch bearing, the eddy current changes, and the impedance change of the measured pitch bearing can cause the impedance change of the measured pitch bearing, and then the self-balancing circuit sends the crack impedance signal to the phase detection filtering module for amplification and filtering, the amplified and filtered signals are collected by the analog-to-digital conversion module, subjected to analog-to-digital conversion and then sent to the micro controller, processed by the micro controller and transmitted to the computer through the wireless transmission module to be processed to generate a crack impedance diagram for displaying, a detector can obtain the size of the crack by observing the impedance range, specifically, the impedance range exceeds a preset safety range when the crack is large, and otherwise, the impedance range does not exceed the preset safety range when the crack is small. Therefore, the system can realize the rapid and autonomous detection of the high-strength steel cracks of the variable-pitch bearing, and compared with the prior art, the detection result is more accurate.
Furthermore, the surface of the bearing substrate is provided with a slide rail, the bottom surface of the mounting seat is provided with a slide groove in sliding fit with the slide rail, two side walls of the lower part of the mounting seat are integrally formed with a protruding block along the moving direction of the slide groove, the protruding block is provided with a plurality of slotted holes, and the slotted holes are internally provided with adjusting bolts in threaded connection with the bearing substrate.
Further, two eddy current probes are installed on the surface of the installation plate and are arranged in radial symmetry relative to the measured variable pitch bearing.
Furthermore, the mounting plate is a circular plate, the center of the circular plate and the center of the measured variable pitch bearing are on the same central axis, and the diameter of the circular plate is larger than that of the measured variable pitch bearing.
Drawings
FIG. 1 is a schematic structural diagram of a high-strength steel crack detection system for a pitch bearing provided by the invention.
FIG. 2 is a schematic diagram of a high-strength steel crack detection system for a pitch bearing provided by the invention.
In the figure, 1, a carrier substrate; 100. a slide rail; 2. a mounting seat; 200. a chute; 201. a bump; 202. a slot; 203. adjusting the bolt; 3. a drive motor; 4. mounting a plate; 5. a microcontroller; 6. a sinusoidal signal generator; 7. an eddy current probe; 8. a self-balancing circuit; 9. a phase detection filtering module; 10. an analog-to-digital conversion module; 11. a wireless transmission module; 12. a computer; 300. and (5) measuring the pitch bearing.
Detailed Description
In order to make the technical means, the creation characteristics, the achievement purposes and the effects of the invention easy to understand, the invention is further explained below by combining the specific drawings.
In the description of the present invention, it is to be understood that the terms "longitudinal", "radial", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience in describing the present invention and simplifying the description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. In the description of the present invention, "a plurality" means two or more unless otherwise specified.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
Referring to fig. 1 and 2, the invention provides a high-strength steel crack detection system for a pitch bearing, which includes a bearing substrate 1, a mounting base 2 is disposed on a surface of the bearing substrate 1, a driving motor 3 is fixedly mounted on a surface of the mounting base 2, a motor shaft of the driving motor 3 is horizontally disposed, a mounting plate 4 is fixedly connected to a terminal end of the motor shaft, a microcontroller 5, a sinusoidal signal generator 6, an eddy current probe 7, a self-balancing circuit 8, a phase detection filter module 9, an analog-to-digital conversion module 10 and a wireless transmission module 11 are disposed on the mounting plate 4, the sinusoidal signal generator 6 generates a sinusoidal excitation signal under the control of the microcontroller 5 to act on the eddy current probe 7, the eddy current probe 7 is opposite to an axial end face of a pitch bearing 300 to be detected, so as to perform eddy current flaw detection scanning detection on the axial end face of the pitch bearing 300 to be detected, the eddy current probe 7 excites an eddy current on the axial end face of a tested variable pitch bearing through a probe coil, the probe coil sends a crack impedance signal generated by eddy current change to a phase detection filtering module 9 through a self-balancing circuit 8 for amplification and filtering, the self-balancing circuit 8 can enable the eddy current probe 7 to output a zero signal when no crack is detected, an analog-digital conversion module 10 acquires the crack impedance signal after amplification and filtering, performs analog-digital conversion and sends the crack impedance signal to a micro-controller 5, and a wireless transmission module 11 is connected with the micro-controller 5 and wirelessly transmits the crack impedance signal to a computer 12 for processing to generate a crack impedance diagram. The microcontroller 5 may specifically be implemented by using an existing STM32F7 series single chip microcomputer, and the sinusoidal signal generator 6, the eddy current probe 7, the self-balancing circuit 8, the phase detection filtering module 9, the analog-to-digital conversion module 10, and the wireless transmission module 11 may specifically be implemented by using existing devices and circuits, that is, specific structures and working principles are known to those skilled in the art, and are not described herein again.
Compared with the prior art, when the high-strength steel crack detection system for the pitch bearing provided by the invention works, the driving motor is started firstly, the eddy current probe on the mounting plate is driven by the motor shaft to rotate, eddy current flaw detection scanning detection is carried out on the axial end face of the measured pitch bearing through the rotating eddy current probe, specifically, a sine excitation signal is generated by the sine signal generator to act on the eddy current probe, the eddy current probe establishes an alternating magnetic field through a probe coil arranged on the eddy current probe, the alternating magnetic field generates an electromagnetic induction effect with the measured pitch bearing through the measured pitch bearing, an eddy current is formed on the surface of the measured pitch bearing, when cracks appear on the surface of the measured pitch bearing, the eddy current changes, and the impedance change of the measured pitch bearing can cause the impedance change of the measured pitch bearing, and then the self-balancing circuit sends the crack impedance signal to the phase detection filtering module for amplification and filtering, the amplified and filtered signals are collected by the analog-to-digital conversion module, subjected to analog-to-digital conversion and then sent to the micro controller, processed by the micro controller and transmitted to the computer through the wireless transmission module to be processed to generate a crack impedance diagram for displaying, a detector can obtain the size of the crack by observing the impedance range, specifically, the impedance range exceeds a preset safety range when the crack is large, and otherwise, the impedance range does not exceed the preset safety range when the crack is small. Therefore, the system can realize the rapid and autonomous detection of the high-strength steel cracks of the variable-pitch bearing, and compared with the prior art, the detection result is more accurate.
As a specific embodiment, please refer to fig. 1, a slide rail 100 is disposed on a surface of the bearing substrate 1, a slide groove 200 slidably engaged with the slide rail 100 is disposed on a bottom surface of the mounting base 2, protruding blocks 201 are integrally formed on two side walls of a lower portion of the mounting base 2 along the slide groove 100, a plurality of slots 202 are disposed on the protruding blocks 201, and adjusting bolts 203 screwed with the bearing substrate 1 are disposed in the slots 202, so that the adjusting bolts 203 are loosened, and a distance between the eddy current probe 7 and an axial end surface of the tested pitch bearing can be adjusted by sliding the mounting base 2 on the surface of the bearing substrate 1, thereby better meeting the application requirement of the eddy current probe 7 for performing eddy current flaw detection scanning on the tested pitch bearing.
As a specific embodiment, two eddy current probes 7 are installed on the surface of the installation plate 4, and the two eddy current probes 7 are radially and symmetrically arranged relative to the measured variable pitch bearing, so that eddy current flaw detection scanning detection can be performed on the measured variable pitch bearing more comprehensively, and the accuracy of a detection result is effectively improved.
As a specific embodiment, the mounting plate 4 is a circular plate, the center of the circular plate and the center of the measured pitch bearing are on the same central axis, that is, the centers of the circular plate and the measured pitch bearing are overlapped, and the diameter of the circular plate is larger than that of the measured pitch bearing, so that the eddy current probe 7 can be conveniently arranged on the mounting plate 4, and the design of the circular plate can make the mounting plate 4 and the measured pitch bearing have the same axial end surface appearance, thereby effectively improving the aesthetic property.
Finally, the above embodiments are only for illustrating the technical solutions of the present invention and not for limiting, although the present invention has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications or equivalent substitutions may be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all of them should be covered in the claims of the present invention.
Claims (4)
1. A high-strength steel crack detection system for a pitch bearing is characterized by comprising a bearing substrate, wherein the surface of the bearing substrate is provided with a mounting seat, the surface of the mounting seat is fixedly provided with a driving motor, a motor shaft of the driving motor is horizontally arranged, the tail end of the motor shaft is fixedly connected with a mounting plate, the mounting plate is provided with a microcontroller, a sinusoidal signal generator, an eddy current probe, a self-balancing circuit, a phase detection filter module, an analog-to-digital conversion module and a wireless transmission module, the sinusoidal signal generator generates a sinusoidal excitation signal under the control of the microcontroller to act on the eddy current probe, the eddy current probe is opposite to the axial end face of the fixed pitch bearing to be detected, the eddy current probe excites eddy current on the axial end face of the pitch bearing to be detected through a probe coil, the probe coil sends a crack impedance signal generated by eddy current change to the phase detection filter module through the self-balancing circuit for amplification and filtering, the analog-digital conversion module acquires the amplified and filtered crack impedance signals, performs analog-digital conversion on the amplified and filtered crack impedance signals and then sends the amplified and filtered crack impedance signals to the micro-controller, and the wireless transmission module is connected with the micro-controller and wirelessly transmits the crack impedance signals to the computer for processing to generate a crack impedance diagram.
2. The high-strength steel crack detection system for the pitch bearing according to claim 1, wherein a slide rail is arranged on the surface of the bearing substrate, a slide groove in sliding fit with the slide rail is arranged on the bottom surface of the mounting base, protruding blocks are integrally formed on two side walls of the lower portion of the mounting base along the direction of the slide groove, a plurality of slotted holes are formed in the protruding blocks, and adjusting bolts in threaded connection with the bearing substrate are arranged in the slotted holes.
3. The system for detecting the cracks in the high-strength steel of the pitch bearing according to claim 1, wherein two eddy current probes are mounted on the surface of the mounting plate and are arranged in a radial symmetry mode relative to the measured pitch bearing.
4. The high-strength steel crack detection system for the pitch bearing according to claim 1, wherein the mounting plate is a circular plate, the center of the circular plate and the center of the pitch bearing to be measured are located on the same central axis, and the diameter of the circular plate is larger than that of the pitch bearing to be measured.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110897014.8A CN113418984A (en) | 2021-08-05 | 2021-08-05 | Become oar bearing high strength steel crack detecting system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110897014.8A CN113418984A (en) | 2021-08-05 | 2021-08-05 | Become oar bearing high strength steel crack detecting system |
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| Publication Number | Publication Date |
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| CN113418984A true CN113418984A (en) | 2021-09-21 |
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| CN202110897014.8A Withdrawn CN113418984A (en) | 2021-08-05 | 2021-08-05 | Become oar bearing high strength steel crack detecting system |
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