CN114280324B - High-sensitivity spinning bead ring speed measuring method - Google Patents
High-sensitivity spinning bead ring speed measuring method Download PDFInfo
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- CN114280324B CN114280324B CN202111657805.XA CN202111657805A CN114280324B CN 114280324 B CN114280324 B CN 114280324B CN 202111657805 A CN202111657805 A CN 202111657805A CN 114280324 B CN114280324 B CN 114280324B
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Abstract
The spinning bead ring speed measuring method is characterized in that a sampling circuit is used for extracting induction signals generated in a coil by cutting magnetic lines of force by the bead ring; filtering high-frequency interference signals by adopting a filter circuit; a peak detection circuit is adopted to extract signals at the rotating speed of the bead ring in real time; the signal extraction circuit is composed of a comparison circuit, the noise signal is filtered through the threshold value setting of the peak detection circuit, and a digital square wave signal with the same frequency as the rotating speed signal is output for the operation processor to calculate the rotating speed data. The operation processor is connected with the multipath signal processing circuit, establishes correlation with the output waveform of the signal extraction circuit, automatically tracks the amplitude of the noise signal, converts the amplitude of the noise signal into a threshold value higher than the noise value, and sends the threshold value to the signal extraction circuit to set a threshold for noise interference; the detection head consists of a magnet, a coil and a magnetic core.
Description
Technical Field
The invention belongs to the technical field of spinning, and particularly relates to a high-sensitivity spinning bead ring speed measuring method.
Background
With the increase of labor cost and textile process requirements in the textile industry, more and more textile enterprises begin to use single spindle monitoring systems. The system judges the current working state of each spindle position mainly by detecting the rotating speed of the steel wire ring when the yarn is wound, thereby realizing the functions of production statistics, cost control and the like. The current speed detection mode mainly comprises an optoelectronic mode and a back magnetic mode.
Disclosure of Invention
According to one embodiment of the invention, a spinning bead ring speed measuring method adopts a speed measuring circuit which comprises a detection head, a sampling circuit, an amplifying circuit, a filter circuit, a peak detection circuit, a signal extraction circuit and an MCU. The detection head is composed of a magnet, a coil and a magnetic core, and the surface magnetism of the magnet is about 150 MT. The distance from the detection head to the bead ring is 4-10mm. The rotating speed of the bead ring is 3000-20000rpm.
The speed measuring method can achieve the technical requirement of extracting the weak rotating speed signal of the spinning bead ring with high sensitivity under the condition of strong background noise.
Drawings
The above, as well as additional purposes, features, and advantages of exemplary embodiments of the present invention will become readily apparent from the following detailed description when read in conjunction with the accompanying drawings. Several embodiments of the present invention are illustrated by way of example, and not by way of limitation, in the figures of the accompanying drawings and in which:
fig. 1 is a schematic diagram of a system for detecting a rotation speed of a bead ring according to one embodiment of the present invention.
FIG. 2 is a schematic diagram of signal coupling interference of a detector head magnet according to one embodiment of the present invention.
Fig. 3 is a schematic block diagram of a bead ring speed measurement circuit according to one embodiment of the present invention.
Detailed Description
The technology adopted in the single ingot monitoring system mainly comprises the following steps: photoelectric and back magnetic type.
The photoelectric type receives the reflected signal of the bead ring mainly through the photodiode, and the reflected signal is amplified and filtered to be a useful signal.
The existing back magnetic type is that an induced current signal generated in a coil by cutting magnetic force lines when the bead ring rotates is simply amplified to be a useful signal, and the scheme has higher requirements on the size of the bead ring and the position of a detection head from the bead ring. When the spinning varieties are replaced, probes with corresponding distances need to be replaced, and inconvenience is brought to users.
The invention aims to solve the defect of narrow detection distance range of the existing back magnetic type single detection head, and allows the same detection head to reliably detect different-size bead ring speeds (3000-20000 rpm) with the distance range of 4-10mm through the design of a hardware circuit and a software algorithm. The key of the invention is how to extract useful signals from strong background noise generated by mutual interference of adjacent detection head signals in a wide distance range.
According to one or more embodiments, a spinning bead ring rotating speed detection method is based on the principle that a metal material is utilized to rapidly cut magnetic lines of force in a magnetic field, induced current is generated in a coil, and the induced current is amplified, filtered, shaped, peak detection and other circuit processing are carried out on a current sampling signal and then sent to an MCU for software filtering and logic operation, so that a useful rotating speed pulse signal is extracted. As shown in fig. 1.
The wider the allowable range from the detection head to the steel ring is, the more different spinning varieties are compatible with the same detection head (the size of the steel ring selected by the spinning varieties is determined). To achieve remote detection, our magnet needs to have higher magnetic flux phi and more turns of coil N, the signal processing board has larger amplification factor G, and induced electromotive force e= -Nxdphi/dt generated in the coil. The increase of the magnetic field intensity has the advantage that the change of the magnetic force lines cut by the rotation of the steel wire ring can still be detected when the distance between the detection body and the steel wire ring is further, but the increased magnet attraction force can cause larger obstruction to the normal rotation of the steel wire ring, and the yarn quality is affected. The increase of the number of turns of the coil increases the magnetic field strength generated by the energized coil itself while increasing the induced current, resulting in greater signal coupling between adjacent channels, as shown in fig. 2.
In accordance with one or more embodiments, the probe selects a magnet with a gauge field of about 150MT that satisfies a low magnetic field strength in the range of 4-10mm, with a rapid decay in magnetic flux after a distance of >10 mm. The influence on the movement of the bead ring is reduced as much as possible.
The 3500 turns is selected to obtain a sufficient induction signal at a long distance. Under the magnetic field intensity and the number of turns of the coil, the selection of the signal amplification factor ensures that the intensity of the rotating speed signal detected at the position of 10mm is more than 100mv so that the signal processor can reliably identify normal signals and interference signals, meanwhile, the supersaturation degree of the signals at the position of 4mm close distance is not deep, the supersaturation signal can be recovered before the next rotating speed signal arrives at the highest rotating speed 20000 revolutions (pulse interval of 3 ms), and the coupling interference signals generated by adjacent channels can not reach saturation.
The distance between the detection head and the bead ring is changed along with the replacement of the spinning varieties. Under constant amplification factor, the same-frequency interference signals of adjacent channels are increased along with the approaching of the detection distance or the increase of the rotating speed of the bead ring, and the coupling interference signals (1.3V) generated at the short distance are far greater than the normal rotating speed signals (0.2V) at the long distance. If not, a 2-fold or even 3-fold erroneous tacho signal is detected.
The existing back magnetic scheme generally changes detection heads with different lengths when yarn varieties are changed, so that the distance between the detection heads and the bead ring is kept in a smaller change range, the proportion of normal signals to interference signals is close, and the detection heads are easy to filter. According to the scheme, on the premise that the detection head is not replaced, fluctuation in a wide range of distances is detected in a self-adaptive mode, interference signals under different distances and different steel wire ring rotation speeds are tracked and filtered automatically, and therefore correct rotation speed signals are obtained.
According to one or more embodiments, a circuit for detecting the rotational speed of a spinning bead ring, and a signal processing circuit are shown in fig. 3. The device comprises a signal acquisition circuit, an amplifying circuit, a filter circuit, a signal extraction circuit, a peak detection circuit and an algorithm processing circuit. The signal acquisition circuit is used for extracting induction signals generated in the coil by cutting magnetic lines of force by the bead ring. The filter circuit filters out the high-frequency interference signal. The peak detection circuit extracts the amplitudes of signals and same-frequency noise at different distances and different steel wire ring rotating speeds in real time, and provides analog signal amplitudes for the operation processor. The signal extraction circuit mainly comprises a comparison circuit, filters an interference signal at the current distance through threshold setting, and outputs a digital square wave signal with the same frequency as the rotating speed signal for the operation processor to acquire the rotating speed information. The algorithm processing circuit collects multipath signals and noise amplitude values, establishes correlation with output waveforms of the signal extraction circuit, automatically tracks the amplitude values of interference signals, converts the amplitude values into threshold values higher than noise values, and sends the threshold values to the signal extraction circuit, and sets the threshold values for interference, so that the purposes of noise suppression, background automatic tracking and threshold value automatic tracking are achieved.
As shown in fig. 3, each detection channel is provided with an independent signal acquisition, filtering, peak detection and signal extraction circuit. The suppression of the inter-channel co-channel interference signals at different distances and different rotating speeds mainly comes from the correct threshold setting of the signal extraction circuit. When the detection head is far away from the bead ring, the rotating speed signal is weak, meanwhile, the interference signal is also weak, and when the detection distance is short, the interference signal generated by the adjacent channels exceeds the normal rotating speed signal when the detection distance is long. And meanwhile, the coupling interference signal is stronger than the coupling interference signal at a low rotating speed when the bead ring rotates at a high speed. Therefore, the setting of the judging threshold value of the normal rotation speed signal needs to be adjusted in real time according to the distance between the detection head and the steel wire ring and the rising and falling of the rotation speed.
Further, the initial threshold of the comparison circuit is set to be 100mv of the minimum signal amplitude to be detected (the precondition of the circuit is that the amplitude of the signal to be detected at a distance of 3000rpm/10mm is greater than the initial threshold), and peak detection signals of all channels are periodically acquired and sequenced. When the bead ring is not rotated, no rotating speed signal exists, and no coupling interference exists. The peak detection signal is lower than the threshold value of 100mv and does not trigger the rotating speed square wave output of the signal extraction circuit.
If the detection amplitude of each signal does not reach the set initial threshold value, the signal is judged as noise, and the threshold value of the output comparison circuit is adjusted to be the (detection amplitude + +Deltamv) of the channel with the highest signal value, namely the maximum interference signal and the margin. The selection of Deltamv is determined by the detection amplitude of the interference signal at the moment, the interference signal is small at a long-distance low rotating speed, the normal rotating speed signal is also small, the amplitude difference between the interference signal and the rotating speed signal at 3000rpm/10mm is 200mv, and the margin of about 100mv is generally selected at the moment, so that the rotating speed signal can be accurately identified, and the interference can be reliably restrained.
When the bead ring starts to rotate, the detection amplitude of the channel starts to exceed an initial comparison threshold, normal rotation speed signals of more than 1 channel are detected gradually, interference signals are increased, the highest signal value (detection amplitude + +Deltamv) in the channel without rotation speed is set as the threshold of an output comparison circuit, and noise of each channel below the highest interference signal amplitude is filtered. The selection of Deltamv is determined based on the detected amplitude of the current rotational speed signal.
When the distance between the bead ring and the detection head is far, the difference between the amplitude of the signal and the amplitude of the interference increases from 200mv to 800mv along with the increase of the rotating speed, and the selection of the interference signal <100mv and delta mv can still be kept at 100mv.
When the distance between the bead ring and the detection head is short, the difference between the amplitude of the signal and the amplitude of the interference increases from 200mv to 1.3v along with the increase of the rotating speed, and the increase of the interference signal always lags behind the rotating speed signal. At this time, the maximum interference signal reaches 1v, and the fluctuation of the interference signal is increased due to the enhancement and high amplification factor of the signal, and when the signal amplitude reaches the full amplitude, deltamv is selected to be more than 300mv so as to inhibit the output of an error comparison circuit possibly caused by the fluctuation of the interference signal.
If a normal rotation speed signal is detected by each of the plurality of channels, the channel (detection amplitude-Deltamv) with the lowest peak detection signal is set as a threshold. The selection of DeltamV also depends on the magnitude of the peak detection signal, the detection peak value is high when the rotation speed is high at a short distance, the difference value between the signal and the interference is large, deltamV is selected to be large, otherwise, when the rotation speed is low at a long distance, the detection peak value is low, the difference value between the signal and the interference is small, and DeltamV is selected to be small.
Under the condition that each channel detects a normal rotating speed signal, if a yarn breakage occurs in the middle of each channel and the wire ring stops rotating, the threshold value is kept unchanged, and when the wire ring is rewired and continues rotating, the channel is still suitable for the original threshold value setting. The interference and signal intensity generated by the channel have a memory function.
The embodiment of the invention uses the algorithm to adjust the threshold value of the output comparison circuit and filters the same-frequency strong and weak background noise generated by different distances and different rotating speeds.
Therefore, the technical scheme of the invention has the beneficial effects that the defects that the matching probe needs to be replaced when the spinning varieties (ring bead rings with different sizes) are replaced are overcome by innovatively designing background metal automatic tracking, noise suppression, threshold automatic tracking algorithms and the like.
It is to be understood that while the spirit and principles of the invention have been described in connection with several embodiments, it is to be understood that this invention is not limited to the specific embodiments disclosed nor does it imply that the features of these aspects are not combinable and that such is for convenience of description only. The invention is intended to cover various modifications and equivalent arrangements included within the spirit and scope of the appended claims.
Claims (1)
1. The speed measuring method of the multi-channel spinning bead ring, the rotating speed range of the spinning bead ring is 3000-20000rpm, the speed measuring method comprises the following steps:
Setting the distance from the detection head to the spinning bead ring to be 4-10mm, wherein the detection head comprises a magnet with a surface magnet of 150MT,
The signal acquisition circuit is used for extracting an induction signal generated by cutting magnetic lines of force by the bead ring in the coil of the detection head, and amplifying the induction signal by the amplifying circuit, wherein when the detection head is 10mm away from the bead ring, the intensity of a rotating speed signal output by the amplifying circuit is more than 100mv;
filtering high-frequency interference signals by adopting a filter circuit;
A peak detection circuit is adopted to extract the rotating speed signal of the steel wire ring in real time;
A digital square wave signal with the same frequency as the rotating speed signal is obtained through a signal extraction circuit for an operation processor to calculate the rotating speed of the steel wire ring,
The signal extraction circuit is composed of a comparison circuit, the initial threshold value of the comparison circuit is set to be the minimum signal threshold value amplitude value required to be detected,
When the output signal of the amplifying circuit is filtered and the signal input into the peak detection circuit is larger than the minimum signal threshold value, the signal extraction circuit outputs a rotating speed signal to the operation processor,
The operation processor establishes correlation with the output waveform of the signal extraction circuit of the multipath signals, automatically tracks the amplitude of the noise signals, converts the amplitude of the noise signals into a minimum signal threshold higher than the noise, and sends the minimum signal threshold to the signal extraction circuit to set a threshold for noise interference, and specifically comprises the following steps:
When the distance between the steel wire ring and the detection head is long, the difference value between the amplitude of the rotating speed signal and the amplitude of the interference signal is increased from 200mv to 800mv along with the rising of the rotating speed of the steel wire ring, and the interference signal is selected to be 100mv at the moment;
When the distance between the wire ring and the detecting head is short, the difference between the amplitude of the signal and the amplitude of the interference increases from 200mv to 1.3v along with the increase of the rotating speed, the maximum interference signal reaches 1v, delta mv is selected to be more than 300mv,
If a normal rotation speed signal is detected for each channel, the value obtained by subtracting Deltamv from the detection amplitude of the channel with the lowest peak detection signal is set as the minimum signal threshold,
If the detection amplitude of each signal does not reach the minimum signal threshold value which is set initially, the signal is judged as noise, the minimum signal threshold value of the output comparison circuit is adjusted to the detection amplitude of the channel with the highest signal value plus the value of delta mv,
If normal rotation speed signals of more than 1 channel are detected in each channel of signals, the detection amplitude with the highest signal value in the channel without rotation speed signal plus Deltamv value is set as the minimum signal threshold value of the comparison circuit.
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE4014756A1 (en) * | 1990-05-08 | 1991-11-21 | Cenith Systems Gmbh & Co Kg | Movement detection device for object or material e.g. of metal - has eddy current generator and correlator of structure noise signal |
| CN101216993A (en) * | 2007-01-04 | 2008-07-09 | 北京北方微电子基地设备工艺研究中心有限责任公司 | A monitoring method and device for the analog interference elimination of the device |
| CN105372086A (en) * | 2015-11-12 | 2016-03-02 | 山东大学（威海） | Programmable spinning machine motion simulation test platform |
| CN107385581A (en) * | 2017-09-11 | 2017-11-24 | 上海兰宝传感科技股份有限公司 | A kind of spinning frame wire loop speed detector |
| CN108385223A (en) * | 2018-01-31 | 2018-08-10 | 南京邮电大学 | A kind of high rotating speed spinning frame wire loop speed detector and its detection method |
| CN112379119A (en) * | 2020-12-07 | 2021-02-19 | 中国航发沈阳发动机研究所 | High-robustness magnetoelectric rotation speed sensor demodulation device and method |
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2021
- 2021-12-30 CN CN202111657805.XA patent/CN114280324B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE4014756A1 (en) * | 1990-05-08 | 1991-11-21 | Cenith Systems Gmbh & Co Kg | Movement detection device for object or material e.g. of metal - has eddy current generator and correlator of structure noise signal |
| CN101216993A (en) * | 2007-01-04 | 2008-07-09 | 北京北方微电子基地设备工艺研究中心有限责任公司 | A monitoring method and device for the analog interference elimination of the device |
| CN105372086A (en) * | 2015-11-12 | 2016-03-02 | 山东大学（威海） | Programmable spinning machine motion simulation test platform |
| CN107385581A (en) * | 2017-09-11 | 2017-11-24 | 上海兰宝传感科技股份有限公司 | A kind of spinning frame wire loop speed detector |
| CN108385223A (en) * | 2018-01-31 | 2018-08-10 | 南京邮电大学 | A kind of high rotating speed spinning frame wire loop speed detector and its detection method |
| CN112379119A (en) * | 2020-12-07 | 2021-02-19 | 中国航发沈阳发动机研究所 | High-robustness magnetoelectric rotation speed sensor demodulation device and method |
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