CN114252497B - Wind generating set and detection device and detection method of variable pitch bearing - Google Patents
Wind generating set and detection device and detection method of variable pitch bearing Download PDFInfo
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Abstract
The present disclosure provides a wind generating set and detection device and detection method of a pitch bearing, the detection device of the pitch bearing includes: a signal generator configured to be electrically connected to two excitation bolts of a plurality of bolts for fixing the pitch bearing and to generate an electric excitation signal; a signal acquisition unit configured to receive return signals received by other return bolts than the two excitation bolts among the plurality of bolts and to obtain a direct current component based on the electric excitation signals and the return signals; and a processor configured to determine whether a crack exists in the plurality of bolts or the pitch bearing based on the magnitude of the direct current component. The detection device provided by the embodiment of the invention can detect the cracking condition of the pitch bearing.
Description
Technical Field
The invention relates to the field of wind power generation, in particular to a wind generating set, a detection device and a detection method of a variable pitch bearing.
Background
With the increasing severity of energy crisis, wind energy is becoming increasingly important worldwide as a clean energy source. The wind generating set has the advantages of high manufacturing cost, severe use environment and complex working condition, and in the running process, the variable pitch bearing can generate cracking phenomenon under the comprehensive action of various loads such as vibration, torsion, shearing, extrusion, bending and torsion loads and the like for a long time.
If the fault of the pitch bearing is not found timely, accidents of equipment of the wind generating set can be possibly caused, huge economic loss is caused, and personal injury accidents can be seriously caused.
The blades of the wind generating set convert wind energy into kinetic energy, a variable pitch bearing connecting the blades and the hub can generate cracking faults, and the cracking faults can be divided into early cracks, medium cracks and late cracks according to the development of the cracks.
After the pitch bearing generates cracks, the cracks are stressed due to the constraint of bolts, the cracks continue to be expanded to the reinforcing ring, the reinforcing ring is cracked, grease leaks out, the cracks continue to be expanded, and finally the blade can be possibly caused to fall.
The existing strain gauge, conductive paint, tinfoil paper and ultrasonic crack early warning has the defects of poor operability, poor running stability, contact damage, high labor cost and the like, and has a plurality of inconveniences in the field test process.
Disclosure of Invention
The invention aims to provide a detection device capable of detecting cracking conditions of a pitch bearing.
One of the purposes of the invention is to provide a detection device which is convenient to install and position.
According to an aspect of the present invention, there is provided a detection apparatus for a pitch bearing, the detection apparatus comprising: a signal generator configured to be electrically connected to two excitation bolts of a plurality of bolts for fixing the pitch bearing and to generate an electric excitation signal; a signal acquisition unit configured to receive a return signal received by a return bolt other than the two excitation bolts among the plurality of bolts and obtain a direct current component based on the electric excitation signal and the return signal; and a processor configured to determine whether a crack exists in the plurality of bolts or the pitch bearing based on the magnitude of the direct current component.
Optionally, the signal acquisition unit may be further configured to: a correlation operation is performed on the electrical excitation signal and the return signal to obtain a direct current component.
Alternatively, the signal acquisition unit may include: an amplifying circuit that amplifies the return signal to obtain an amplified signal; and an analog signal multiplier for performing a correlation operation on the amplified signal and the electric excitation signal to obtain a direct current component.
Optionally, the detection device may further include: the filter circuit filters the direct current component to obtain a direct current signal; the analog-to-digital converter converts the direct current signal to a digital signal, and the processor is further configured to determine whether a crack exists in the plurality of bolts or the pitch bearing based on the digital signal.
Alternatively, the filter circuit may comprise two low-pass filters connected in series with each other.
Alternatively, a plurality of bolts may be fixed to an edge of the pitch bearing in a circumferential direction of the pitch bearing, the processor being configured to determine a location of the crack based on an amplitude of the direct current component obtained for each of the return bolts.
Optionally, the processor may be further configured to: in response to the attenuation of the magnitude of the direct current component exceeding a predetermined value, it is determined that a return bolt or a pitch bearing near the return bolt at the corresponding location is cracked.
Alternatively, the two excitation bolts may be arranged in the diametric direction of the pitch bearing.
Optionally, the processor may be further configured to: in response to attenuation of a direct current component obtained by a first return bolt of the two adjacent return bolts that is distal from the ground point exceeding a first predetermined value and attenuation of a direct current component obtained by a second return bolt of the two return bolts that is proximal to the ground point being less than a second predetermined value, determining that a crack exists in the first return bolt or a crack exists in a portion of the pitch bearing that is proximal to the first return bolt, wherein the first predetermined value is greater than the second predetermined value.
Alternatively, the electrical excitation signal may comprise at least one of a sinusoidal signal, a square wave signal and a triangular wave signal.
According to another aspect of the invention, a wind park comprises a detection device according to the pitch bearing described above.
According to another aspect of the invention, a method of detecting a pitch bearing may comprise: providing an electrical excitation signal to two excitation bolts of a plurality of bolts for securing the pitch bearing; receiving return signals received by other return bolts of the plurality of bolts except for the two excitation bolts, and obtaining a direct current component based on the electric excitation signals and the return signals; it is determined whether a crack is present in the plurality of bolts or the pitch bearing based on the magnitude of the direct current component.
Alternatively, the step of obtaining a direct current component based on the electrical excitation signal and the return signal may comprise: a correlation operation is performed on the electrical excitation signal and the return signal to obtain a direct current component.
Optionally, the step of determining whether the plurality of bolts or the pitch bearing has cracks based on the magnitude of the direct current component may comprise: in response to the attenuation of the amplitude of the direct current component exceeding a predetermined value, it is determined that a crack exists in the bolt or a pitch bearing near the bolt at the corresponding location.
Alternatively, a plurality of bolts may be fixed to the edge of the pitch bearing in the circumferential direction of the pitch bearing, and two excitation bolts may be arranged in the diameter direction of the pitch bearing.
Optionally, the step of determining whether the plurality of bolts or the pitch bearing has cracks based on the magnitude of the direct current component may comprise: in response to attenuation of a direct current component obtained by a first return bolt of the two adjacent return bolts that is distal from the ground point exceeding a first predetermined value and attenuation of a direct current component obtained by a second return bolt of the two return bolts that is proximal to the ground point being less than a second predetermined value, determining that a crack exists in the first return bolt or a crack exists in a portion of the pitch bearing that is proximal to the first return bolt, wherein the first predetermined value is greater than the second predetermined value.
The detection device and the detection method provided by the embodiment of the invention have strong compatibility, can detect and early warn the cracking condition of the variable pitch bearing of different machine types, and only needs to delete or increase the number of detection channels.
The detection device and the detection method according to the embodiment of the invention adapt to the requirement that the communication channel cannot be increased by the existing machine type by using wireless communication.
In addition, the detection device and the detection method of the embodiment of the invention avoid a great deal of work of maintenance personnel, and improve the maintenance efficiency.
Drawings
The foregoing and/or other objects and advantages of the invention will become more apparent from the following description of embodiments taken in conjunction with the accompanying drawings in which:
Fig. 1 is a block diagram showing a detection circuit according to a first embodiment of the present disclosure;
FIG. 2 is a schematic diagram illustrating a detection point of a pitch bearing according to an embodiment of the present disclosure;
fig. 3 is a block diagram illustrating a detection circuit according to a second embodiment of the present disclosure;
Fig. 4 is a flowchart illustrating a detection method according to a first embodiment of the present disclosure; and
Fig. 5 is a flowchart illustrating a detection method according to a second embodiment of the present disclosure.
Detailed Description
Embodiments of the present disclosure utilize a bolt of a pitch bearing as a receiving component of an electrical excitation signal, and determine whether a crack exists in the pitch bearing or the bolt of the pitch bearing through a return signal of the electrical excitation signal. The method has a good early warning effect on cracks of the variable pitch bearing or the bolt of the wind generating set.
The test process and the application result show that compared with the commonly adopted strain foil, conductive paint, tinfoil paper and ultrasonic crack detection technology, the detection technology has the advantages of small artificial interference factor, high engineering operability, low labor cost and strong compatibility. For variable pitch bearings of different types, only the number of detection channels needs to be reduced or increased. In addition, the contact damage to the pitch bearing of the wind generating set is also small.
The detection device and the detection method of the pitch bearing of the invention are described in detail below with reference to the accompanying drawings. Like numbers refer to like elements throughout the detailed description.
Fig. 1 is a block diagram illustrating a detection circuit according to a first embodiment of the present disclosure, fig. 2 is a schematic diagram illustrating a detection point of a pitch bearing according to an embodiment of the present disclosure, and fig. 3 is a block diagram illustrating a detection circuit according to a second embodiment of the present disclosure.
The detection device of the pitch bearing can be used for monitoring, early warning, alarming and the like on the pitch bearing of the wind generating set and/or cracks of bolts on the pitch bearing.
The detection device according to an embodiment of the present disclosure may include a signal generator 11, a signal acquisition unit 30, and a processor 40.
The signal generator 11 may be electrically connected to a plurality of bolts 20 on a pitch bearing 22, e.g., the signal generator 11 may be electrically connected to two excitation bolts of the plurality of bolts and may generate an electrical excitation signal.
Here, the electric excitation signal may include a sinusoidal signal, a square wave signal, and a triangular wave signal, but embodiments of the present disclosure are not limited thereto.
According to the embodiment of the disclosure, the electric excitation signal is directly applied to the bolt for crack detection, so that the artificial interference factor is small, the engineering operability is high, the cost is low, the compatibility is strong, and the contact damage to the pitch bearing of the wind generating set is small.
The signal generator 11 may autonomously supply the electric excitation signal Vin or may output a desired electric excitation signal Vin under the control of the processor 40. Specifically, the signal generator 11 may output a 1MHz sine wave of 5V under the control of the processor 40.
The signal acquisition unit 30 may receive a return signal received by other bolts (return bolts) than the two excitation bolts among the plurality of bolts, and obtain a direct current component based on the electric excitation signal and the return signal.
The return bolt herein refers to a bolt through which a return signal is received, and the return signal refers to a detection signal or a feedback signal received from the return bolt after an electric excitation signal is applied to the excitation bolt.
Processor 40 may determine whether a crack exists in the plurality of bolts or pitch bearings based on the magnitude of the dc component. For example, the processor 40 may determine whether a crack is present based on the magnitude of the direct current component obtained for each of the return bolts, and may determine the location of the crack when the crack is present.
Processor 40 may be a digital signal processor, for example, processor 40 may be comprised of a floating point DSP, and processor 40 may control signal generator 11 via a software program to apply a sine wave electrical excitation signal to the watch point (e.g., a plurality of bolts) of pitch bearing 22. Alternatively, the processor 40 may be implemented by a single-chip microcomputer or the like.
As shown in fig. 2, positive and negative signals are supplied to the first and second excitation bolts 23 and 24, respectively, where "GND" is the reference zero potential of all detection signals, monitoring points ①～⑩ correspond to bolts on the pitch bearing, respectively, and acquisition signal lines of the signal acquisition unit 30 are connected to the respective bolts.
As shown in fig. 2, one end of the ten-way signal acquisition line is connected to the corresponding bolt, the other end of the ten-way signal acquisition line is connected to the connector J1, and the positive signal and the negative signal in the excitation signal are also electrically connected to the connector J1.
Although the number of return bolts is shown as 10 in the drawings, this is merely an example, and the number of bolts is not particularly limited, and for example, the number of bolts may be in the range of 4 to 100 (e.g., 4, 8, or 20). Each return bolt may be encoded by a processor, and the processor 40 may determine whether a crack exists in the respective bolt or a pitch bearing in its vicinity based on the return signal of the respective bolt, and may determine the location of the crack relative to the respective bolt.
For example, when it is determined that the amplitude of the return signal received from monitoring point ② is below a predetermined value, it may be determined that a crack exists in the pitch bearing near monitoring point ② and/or the bolt at monitoring point ②.
The farther the return bolt is from the input point of the positive signal (the farther from the excitation bolt 23), the smaller the amplitude of the return signal received by the return bolt, but the degree of attenuation is significantly less than that caused by the presence of cracks in the pitch bearing or bolt. The predetermined value here may be a predetermined percentage (e.g., 80%) of the amplitude of the electrical excitation signal. Further, it may also be determined whether a crack is present based on the phase change of the return signal to improve the accuracy of crack monitoring. For example, when it is determined that the amplitude of the return signal received from monitoring point ② is below a predetermined value and the phase of the return signal is delayed by a predetermined phase relative to the electrical excitation signal, it may be determined that a crack exists in the pitch bearing near monitoring point ② and/or the bolt at monitoring point ②.
In addition, the return signals received by different monitoring points can be normalized, for example, in the case that no crack exists, the processor can normalize the return signals received by different monitoring points, so that the amplitudes of the return signals received by different monitoring points are the same. For example, the amplitude of the return signal received by monitoring point ① is M1, when the amplitude of the return signal actually received by monitoring point ② is 95% M1, the amplitude of the return signal actually received by monitoring point ③ is 90% M1, the amplitude of the return signal actually received by monitoring point ④ is 85% M1, the amplitude of the return signal actually received by monitoring point ⑤ is 80% M1, the processor may normalize it to M1 and determine that no crack exists in the pitch bearing and bolt. That is, the processor may convert the amplitude of the return signal received by each monitoring point in a different manner so that they are identical to each other in the absence of a crack, and if the amplitude after conversion is less than a threshold value, may determine that a crack exists at the monitoring point at the corresponding location. Thereby, the influence of normal attenuation due to normal increase of impedance on the signal transmission path can be reduced.
Processor 40 may determine that a crack exists in a first return bolt of the pitch bearing in response to attenuation of a dc component obtained by a first return bolt of the adjacent two return bolts (e.g., return bolt of monitoring point ①) that is distal to the ground point exceeding a first predetermined value and attenuation of a dc component obtained by a second return bolt of the two return bolts (e.g., return bolt of monitoring point ②) that is proximal to the ground point falling below a second predetermined value. The first predetermined value is greater than the second predetermined value. If normalized, the attenuation of the DC component obtained by the second return bolt herein may be zero. If not normalized, the attenuation of the DC component obtained by the second return bolt herein may be a normal attenuation value, e.g., 5%.
In addition, processor 40 may also determine that a crack exists in a portion of the pitch bearing between the first return bolt and the second return bolt in response to the attenuation of the dc component obtained by a first one of the two adjacent return bolts (e.g., the return bolt of monitoring point ①) that is distal to the ground point being within a normal range and the attenuation of the dc component obtained by a second one of the two return bolts (e.g., the return bolt of monitoring point ②) that is proximal to the ground point being greater than a third predetermined value and less than a fourth predetermined value. The third predetermined value may here be a normal attenuation value and the fourth predetermined value may be greater than the normal attenuation value. In other words, if the return signal of the first return bolt normally decays, but the return signal of the second return bolt abnormally decays, but the degree of decay is not very large, it can be determined that the second return bolt itself has no crack, but that a crack exists in a portion between the first return bolt and the second return bolt. Due to the presence of this crack, the impedance of the path through which the signal passes increases, resulting in an increase in the amplitude of attenuation of the second return bolt.
According to the embodiment of the invention, the health condition of each bolt of the pitch bearing and the pitch bearing can be dynamically monitored on line, and early warning can be carried out.
As shown in fig. 2, the plurality of bolts are fixed to the edge of the pitch bearing 22 along the circumferential direction of the pitch bearing 22, and for example, may be disposed at the edge of the pitch bearing 22 at equal angles, where equal angles means that the angles formed by adjacent two bolts and the line connecting the axes of the pitch bearings are the same.
The first and second excitation bolts 23, 24 may be arranged along the diametric direction of the pitch bearing, the other bolts (return bolts) may be symmetrically arranged on both sides of the diametric direction, for example, the return bolts of the monitoring point ①～⑤ may be arranged on the left side of the diametric direction and the return bolts of the monitoring point ⑥～⑩ may be arranged on the right side of the diametric direction.
The first excitation bolt 23 and the second excitation bolt 24 are arranged in the diameter direction of the pitch bearing, which is beneficial to the acquisition of return signals and the judgment of the position of cracks.
Alternatively, the processor 40 may receive the analog-to-digital converted digital signal without conversion by an ADC within the processor 40, and the processor 40 may directly receive the dc component and convert it to a digital signal, and then determine whether a crack exists in the plurality of bolts or pitch bearings based on the digital signal.
As shown in fig. 3, the signal acquisition unit 30 may receive return signals from the respective monitoring points collected by the connector 21, i.e., the signal acquisition unit 30 may receive the return signals received by the return bolts other than the two excitation bolts of the plurality of bolts and obtain a direct current component based on the electric excitation signals and the return signals.
The signal acquisition unit 30 may perform a correlation operation on the electrical excitation signal and the return signal to obtain a direct current component. Since noise is uncorrelated with the electrical excitation signal, noise can be removed by correlation operations.
For example, let s (t) =v scos(ωm t+θ be a weak small signal to be measured, n (t) be a noise signal, and r (t) =v rcos(ωm t be an electrical excitation signal, then the input signal x (t) =s (t) +n (t) mixed with noise. The cross-correlation function of the input signal and the reference signal is:
wherein R sr (t): a cross-correlation function of the signal to be measured and the reference signal; r nr (t): cross correlation function of noise and electrical excitation signal. Because the noise and the reference signal are uncorrelated, R nr (t) =0, so that R xr(t)＝Rsr (t) is obtained, that is, the cross-correlation function of the input signal and the electric excitation signal (i.e., the reference signal) is only the cross-correlation function of the signal to be measured and the electric excitation signal, so that the noise is filtered.
Alternatively, the signal acquisition unit 30 may not perform a correlation operation on the return signal, but directly determine whether a crack exists at the corresponding monitoring point based on the amplitude of the return signal. The correlation operation may be performed by hardware, for example, the signal acquisition unit 30 may include an amplifying circuit 31 and an analog multiplier 32, the amplifying circuit 31 may amplify the return signal to obtain an amplified signal, and the analog multiplier 32 may perform the correlation operation on the amplified signal and the electric excitation signal to obtain a direct current component. The direct current component here may still comprise a small amount of high frequency noise.
The processor may determine whether a crack exists at the respective monitoring point based on the magnitude of the direct current component. Optionally, the direct current component of the signal acquisition unit 30 may be further filtered via a filter.
The detection apparatus according to the embodiment of the present disclosure may further include a filter circuit 50 and an analog-to-digital converter 60, the filter circuit 50 may filter the direct current component to obtain a direct current signal, and the analog-to-digital converter 60 may convert the direct current signal into a digital signal. The digital signal may be further processed by, for example, a processor 40. That is, the filter circuit 50 can further filter out high frequency noise.
The filter circuit 50 may be composed of a dedicated low-pass filter chip and peripheral auxiliary resistor-capacitor devices, in order to filter out high-frequency noise and prevent signal aliasing. For example, a Butterworth second order low pass filter may be employed, where the amplitude frequency response of the Butterworth filter is almost completely flat from zero to the cut-off frequency attenuated by 3dB, but peaks around the cut-off frequency, overshooting and ringing the step response, the transition band dropping at a moderate rate at-6 ndB/decade, where n is the order of the filter.
According to embodiments of the present disclosure, the filter circuit may include an integrated filter chip that is an ultra low noise, high frequency filter module for channel anti-aliasing or reconstruction applications. The integrated filter chip may include matched second order filters, and cascading two internal second order filters (e.g., two low pass filters connected in series with each other) may simply achieve a fourth order or higher order response. Furthermore, embodiments of the present disclosure are not limited thereto, and various low-pass or band-pass responses, such as butterworth, chebyshev, bezier, or elliptical responses, may be implemented very simply.
Processor 40 may determine whether a crack exists in the plurality of bolts or pitch bearings based on the digital signals. The digital signal may reflect the degree of attenuation of the return signal, and when the degree of attenuation exceeds a predetermined value, the processor 40 may send an early warning signal to the nacelle control system, which may be a binary number reflecting the presence or absence of a crack. For example, 0 indicates no crack, and 1 indicates a crack. However, this is merely exemplary, and the early warning signal may be hexadecimal or a character string, or the like.
As shown in fig. 3, the detection device according to the embodiment of the disclosure may further include a communication interface circuit 90 and a wireless communication interface 91, where the communication interface circuit 90 may be composed of an RS485 interface chip, an optical coupler, and the like, the early warning signal may be output to the communication interface circuit 90 via a serial port of the processor, the wireless communication interface 91 may convert a signal transmitted by the communication interface circuit 90 into a wireless signal, and the wireless signal may be received by another wireless communication interface 100 and further transmitted to the cabin control system 110 through the other wireless communication interface 100. When the pitch bearing is abnormal (e.g., a crack exists in the pitch bearing or bolt), the nacelle control system 110 may receive an early warning signal, the nacelle control system may control the wind turbine to stop and upload data to the control room.
The detection device according to the embodiment of the present disclosure may further include a power supply unit 80 and a storage unit 70, the power supply unit 80 may be used to supply power to the processor and all sub-components of the system, and the power supply unit 80 may be composed of a plurality of (e.g., four) lithium super-capacitor cells connected in series. The storage unit 70 may be used to store configuration of the system, initialization values, user settings, etc. The detection device according to the embodiment of the invention can be provided with a power supply system, so that the long-time standby requirement can be met.
In addition, the detection device according to the embodiment of the present disclosure may be included in a wind power generation set, thereby improving safe operation of the wind power generation set.
Fig. 4 is a flowchart showing a detection method according to a first embodiment of the present disclosure, and fig. 5 is a flowchart showing a detection method according to a second embodiment of the present disclosure.
As shown in fig. 4, the detection method according to an embodiment of the present invention may include:
S410: the electrical excitation signal is provided to two excitation bolts of a plurality of bolts for fixing the pitch bearing, where the electrical excitation signal may comprise a sinusoidal signal, a square wave signal, a triangular wave signal, etc., as described above. The electrode may be electrically connected to the bolt and then an electrical excitation signal may be applied to the electrode to provide the electrical excitation signal to the bolt. Of course, the electrical excitation signal may also be provided directly to the bolt.
S420: the method includes receiving a return signal received by a return bolt of the plurality of bolts other than the two excitation bolts, and obtaining a direct current component based on the electrical excitation signal and the return signal.
Specifically, as shown in fig. 5, step S420 of the detection method according to the second embodiment of the present invention may include step S421: a correlation operation is performed on the electrical excitation signal and the return signal to obtain a direct current component. Most of the noise can be removed by correlation.
S430: it is determined whether a crack is present in the plurality of bolts or the pitch bearing based on the magnitude of the direct current component.
Specifically, as shown in fig. 5, step S430 of the detection method according to the second embodiment of the present invention may include step S431: the presence of a crack in the bolt or in the pitch bearing in the vicinity of the bolt at the respective position is determined in response to the amplitude attenuation of the direct current component exceeding a predetermined value.
For example, the crack may be determined to exist in the first one of the two adjacent return bolts in response to attenuation of the dc component obtained by a first one of the two return bolts that is distal from the ground point exceeding a first predetermined value and attenuation of the dc component obtained by a second one of the two return bolts that is proximal to the ground point being below a second predetermined value.
The first predetermined value may be greater than the second predetermined value. If normalized, the attenuation of the DC component obtained by the second return bolt herein may be zero. If not normalized, the attenuation of the DC component obtained by the second return bolt herein may be a normal attenuation value, e.g., 5%.
In addition, it may also be determined that a crack exists in a portion of the pitch bearing between the first return bolt and the second return bolt in the two return bolts (e.g., the return bolt of the monitoring point ②) in response to the attenuation of the dc component obtained by a first return bolt of the two adjacent return bolts (e.g., the return bolt of the monitoring point ①) that is distal to the ground point being within a normal range and the attenuation of the dc component obtained by a second return bolt of the two return bolts that is proximal to the ground point being greater than a third predetermined value and less than a fourth predetermined value. The third predetermined value may here be a normal attenuation value and the fourth predetermined value may be greater than the normal attenuation value.
In other words, if the return signal of the first return bolt normally decays, but the return signal of the second return bolt abnormally decays, but there is no significant decay, it can be determined that the second return bolt itself has no crack, but rather that there is a crack in the portion between the first return bolt and the second return bolt. Due to the presence of this crack, the impedance of the path that the signal needs to travel after passing through the first return bolt increases, resulting in an increase in attenuation of the second return bolt.
The wind generating set applying the detection technology can improve the safety of the whole set.
The detection device and the detection method provided by the embodiment of the invention have strong compatibility, can detect the variable pitch bearings of different types, and only need to delete or increase the number of detection channels.
The detection device and the detection method according to the embodiment of the invention use wireless communication, thereby adapting to the requirement that the prior machine type can not increase the communication channel.
According to the detection device and the detection method provided by the embodiment of the invention, the problem of data exchange can be solved under the condition that the communication channel cannot be increased by the original unit.
According to the detection device and the detection method provided by the embodiment of the invention, the detection signal excitation source can be applied to the bolt of the pitch bearing, and the health conditions of the bolt and the pitch bearing can be monitored simultaneously.
In addition, the detection device and the detection method can avoid a great deal of work of maintenance personnel, and improve maintenance efficiency.
The foregoing is merely a preferred embodiment of the present disclosure, but the scope of the present disclosure is not limited thereto, and any changes or substitutions (e.g., the features in the different embodiments of the present disclosure may be combined) that are easily conceivable by those skilled in the art within the technical scope of the present disclosure are intended to be included in the scope of the present disclosure. Therefore, the protection scope of the present disclosure shall be subject to the protection scope of the claims.
Claims (10)
1. The utility model provides a detection device of pitch bearing which characterized in that includes:
A signal generator configured to be electrically connected to two excitation bolts of a plurality of bolts for fixing the pitch bearing and to generate an electric excitation signal;
A signal acquisition unit configured to receive a return signal received by a return bolt other than the two excitation bolts of the plurality of bolts and obtain a direct current component based on the electric excitation signal and the return signal;
A processor configured to determine whether a crack exists in the plurality of bolts or the pitch bearing based on the magnitude of the direct current component,
Wherein, the signal acquisition unit includes: an amplifying circuit that amplifies the return signal to obtain an amplified signal; an analog signal multiplier for performing a correlation operation on the amplified signal and the electric excitation signal to obtain the direct current component,
The detection device further includes: a filter circuit for filtering the DC component to obtain a DC signal; an analog-to-digital converter for converting the DC signal into a digital signal,
The processor is further configured to determine whether a crack exists in the plurality of bolts or the pitch bearing based on the digital signal,
Wherein the processor is further configured to: in response to attenuation of a direct current component obtained by a first return bolt of the two adjacent return bolts that is farther from the ground point exceeding a first predetermined value and attenuation of a direct current component obtained by a second return bolt of the two return bolts that is closer to the ground point being below a second predetermined value, a determination is made that the first return bolt is cracked, wherein the first predetermined value is greater than the second predetermined value.
2. The pitch bearing detection apparatus according to claim 1, wherein the signal acquisition unit is further configured to: and performing correlation operation on the electric excitation signal and the return signal to obtain the direct current component.
3. A detection arrangement for a pitch bearing according to claim 1, wherein the filter circuit comprises two low pass filters connected in series with each other.
4. The apparatus according to claim 1, wherein the plurality of bolts are fixed to an edge of the pitch bearing in a circumferential direction of the pitch bearing,
The processor is configured to determine a location of the crack based on an amplitude of a direct current component obtained for each of the return bolts.
5. The device for detecting a pitch bearing according to claim 4, wherein the two exciting bolts are arranged in a diameter direction of the pitch bearing.
6. The pitch bearing detection apparatus according to any one of claims 1 to 5, wherein the electrical excitation signal comprises at least one of a sinusoidal signal, a square wave signal, and a triangular wave signal.
7. A wind power plant comprising a detection device of a pitch bearing according to any of claims 1 to 6.
8. A detection method of a pitch bearing, the detection method being performed using the detection apparatus of a pitch bearing according to any one of claims 1 to 6, characterized in that the detection method comprises:
Providing an electrical excitation signal to two excitation bolts of a plurality of bolts for fixing the pitch bearing;
Receiving a return signal received by a return bolt of the plurality of bolts other than the two excitation bolts, obtaining a direct current component based on the electrical excitation signal and the return signal;
determining whether a crack exists in the plurality of bolts or the pitch bearing based on the magnitude of the direct current component,
The step of determining whether a crack exists in the plurality of bolts or the pitch bearing based on the magnitude of the direct current component comprises: in response to attenuation of a direct current component obtained by a first return bolt of the two adjacent return bolts that is farther from the ground point exceeding a first predetermined value and attenuation of a direct current component obtained by a second return bolt of the two return bolts that is closer to the ground point being below a second predetermined value, it is determined that a crack exists in the first return bolt.
9. The method of claim 8, wherein the step of obtaining a direct current component based on the electrical excitation signal and the return signal comprises: and performing correlation operation on the electric excitation signal and the return signal to obtain the direct current component.
10. The method for detecting a pitch bearing according to claim 9, wherein the plurality of bolts are fixed to an edge of the pitch bearing in a circumferential direction of the pitch bearing, and the two exciting bolts are arranged in a diameter direction of the pitch bearing.
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