CN107385581B - Spinning frame steel wire ring rotation speed detection device - Google Patents
Spinning frame steel wire ring rotation speed detection device Download PDFInfo
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- CN107385581B CN107385581B CN201710812441.5A CN201710812441A CN107385581B CN 107385581 B CN107385581 B CN 107385581B CN 201710812441 A CN201710812441 A CN 201710812441A CN 107385581 B CN107385581 B CN 107385581B
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- D—TEXTILES; PAPER
- D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
- D01H—SPINNING OR TWISTING
- D01H7/00—Spinning or twisting arrangements
- D01H7/02—Spinning or twisting arrangements for imparting permanent twist
- D01H7/52—Ring-and-traveller arrangements
- D01H7/60—Rings or travellers; Manufacture thereof not otherwise provided for ; Cleaning means for rings
- D01H7/604—Travellers
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- D—TEXTILES; PAPER
- D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
- D01H—SPINNING OR TWISTING
- D01H13/00—Other common constructional features, details or accessories
- D01H13/32—Counting, measuring, recording or registering devices
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- Mechanical Engineering (AREA)
- Textile Engineering (AREA)
- Investigating Or Analyzing Materials By The Use Of Magnetic Means (AREA)
Abstract
The invention provides a spinning frame traveller rotation speed detection device, which is characterized in that an eddy current sensor is arranged on one side of a steel collar and on the height of a traveller. The MCU generates square wave signal excitation, sine wave signals are formed on the coil of the current vortex sensor through conversion, an alternating magnetic field is generated around the coil, when the steel wire ring rotates in the magnetic field, magnetic lines of force are cut, reverse vortex can be induced, a secondary magnetic field generated by the vortex is superposed with an original magnetic field, so that the current of the coil is changed, the current change amount in the coil is different due to different positions of the two coils relative to the steel wire ring, and the difference value signals are detected through a signal processing circuit at the back. And detecting the pulse generated by the rotation of the steel wire ring according to the threshold value calculated by the MCU, and calculating the rotating speed. The method effectively solves the problems that the prior photoelectric sensor has the requirement of chromatic aberration on the surface color of the steel wire ring and the surface color of the steel collar and the steel wire ring is magnetized by the back magnetic Hall sensor, overcomes the defect of short detection distance of the traditional inductive sensor, and improves the detection distance by 4-5 times compared with the detection distance of the sensor with the same specification.
Description
Technical Field
The invention relates to the technical field of spinning frame detection, in particular to a spinning frame steel wire ring rotating speed detection device.
Background
The traditional spinning frame has great loss in the aspect of real-time detection of yarns, generally has no installation of a related detection device, so that inspection is completely carried out by depending on manpower in the production process, whether yarn breakage, abnormal rotating speed of a steel wire ring and the like exist through visual inspection, and the following defects still exist: firstly, after a broken yarn occurs, an inspector often needs to go back after going round to find the broken yarn, and the broken yarn can float to two sides along with the air flow, so that the broken yarn is very easy to be wound with adjacent normally-running yarns to cause serious accidents such as the broken yarn of a larger area and even the stop of the whole machine; secondly, the speed change of the steel wire ring is difficult to be found by manual visual inspection under the high-speed operation, so that the parameters of the delivered yarn are uneven and have poor consistency, a cotton mill can only depend on frequent machine maintenance, the failure rate of the machine is reduced to improve the product quality, and the quality improvement degree by the method is very limited.
In view of the reasons, equipment manufacturers add a steel wire ring rotating speed detection system on original equipment at present, detect the rotating speed change of a steel wire ring on a steel collar in real time, give an early warning to broken yarns according to rotating speed change characteristics, and treat and inhibit the broken yarns in advance.
The prior traveller rotating speed detection device which is popular in the market mostly adopts a scheme of diffuse reflection infrared photoelectric sensors, and is characterized in that the detection distance is long, the traveller rotating speed detection device is insensitive to the material of a detected body, but has high requirements on the environment, a probe is required to be kept clean, otherwise, the detection effect is influenced to cause misjudgment, and the traveller rotating speed detection device has a fatal defect, has high requirements on the color and the light reflection rate of the detected body, and can stably detect the detected body only by requiring a large color difference between the detected body and a background.
Disclosure of Invention
The invention provides a spinning machine traveller rotation speed detection device, which aims to solve the problems that a photoelectric sensor has high requirements on the color and the light reflection rate of a detected object and the back magnetic intensity of a Hall sensor has a magnetization effect on a traveller and a ring.
The invention is realized by the following technical scheme:
a spinning frame traveller rotation speed detection device comprises an MCU control circuit, a square wave triangular wave conversion circuit, a coil detection circuit and a signal processing circuit, as shown in figure 2.
The height of the steel collar and the steel wire ring is opposite to that of the ring, and an eddy current sensor is arranged as shown in figure 1.
The MCU generates a square wave signal with fixed frequency, the square wave signal is converted into a triangular wave signal through the triangular wave generator, the coil of the eddy current sensor is driven by constant voltage amplitude, and a stable sine wave signal is formed at the coil.
The coil detection circuit adopts an eddy current sensor coil and a resonance capacitor to form a resonance loop, the coil is arranged at two ends of a bar-shaped soft magnetic material to form an eddy current sensor probe, and one end of the eddy current sensor probe is arranged close to the steel wire ring.
The signal processing circuit comprises an operational amplifier, a second-order band-pass filter and a peak detection circuit, wherein two paths of signals sampled from the coil are subjected to differential amplification to remove common-mode background signals of the ring and the ambient temperature, useful signals are taken out through the second-order band-pass filter network and are respectively sent to the two paths of peak detection circuits for detection, one path is used for detecting the ring background signals and tracking whether the position of the ring changes, and the other path is used for detecting the steel wire ring signals;
the MCU processes and calculates the detection signal of the peak detection circuit, the offset is calculated by subtracting the background signal voltage from the detected bead ring peak voltage, half of the offset and the background signal voltage are taken as threshold values, the bead ring peak signal is judged to be greater than the threshold value signal, the time interval of two continuous bead ring peak signals is a period T, and the reciprocal 1/T of the period is the rotating speed.
Further, the MCU generates a fixed frequency square wave signal with a 50% duty cycle.
Further, the passband frequency range of the second-order bandpass filtering is from tens of kHz to hundreds of kHz.
The square wave and triangular wave conversion circuit is used for converting a 50% duty ratio fixed frequency square wave signal generated by the MCU into a triangular wave signal, driving the detection coil with constant voltage amplitude, and forming a stable sine wave signal on the detection coil, wherein the schematic diagram of the circuit is shown in figure 3, and the waveform diagram of the generated triangular wave signal is shown in figure 4.
The coil detection circuit generates resonance when the resonance frequency of the loop is consistent with the frequency of the driving signal, the coil can induce a signal which is several times of the driving voltage, an alternating magnetic field is generated around the coil, when the steel wire ring enters the magnetic field, reverse eddy current can be induced, a secondary magnetic field generated by the eddy current is superposed with an original magnetic field to change the current of the coil, the current change amount in the coil is different due to different positions of the two coils relative to the steel wire ring, the difference signal is detected by a subsequent signal processing circuit, the structural schematic diagram of the coil of the current eddy current sensor is shown in figure 5, and the principle of the resonance loop circuit is shown in figure 6.
In the signal processing circuit, the operational amplifier circuit is shown in fig. 7, the second-order band-pass filter circuit is shown in fig. 8, and the peak detector circuit is shown in fig. 9.
The sensitivity of the detection is 4-5 times higher than that of a common inductive sensor, firstly, a coil excitation mode is adopted, the magnetic field intensity is stronger, secondly, a signal processing circuit adopts an amplifier with higher common mode rejection ratio and narrow-band second-order band-pass filtering, the background is tracked, the bias voltage of the amplifier is adjusted according to the strength of a background signal, and the integrity of an effective signal under a larger amplification factor is ensured.
Compared with the prior art, the invention has the following beneficial effects:
1) The invention completely avoids the inherent defects of the photoelectric sensor and the back magnetic Hall sensor, adopts a novel differential coil inductive sensor scheme for detection, has the characteristic of insensitivity to the surface color of the detected object, has no requirements on the color, the light reflection rate and the like of the detected object, adopts soft magnetic materials, does not produce any magnetization effect on a steel collar and a steel wire ring, does not influence any parameter of a spinning process, and can effectively solve the problem that the current photoelectric sensor has the requirement of chromatic aberration on the surface color of the steel wire ring and the surface color of the steel collar and the problem that the back magnetic Hall sensor magnetizes the steel wire ring.
2) The inductance type sensor originally saves the inherent capability of resisting severe environment, and the environmental temperature, vibration, floating dust, cotton yarn adhered to the detection surface and even oil stain can not influence the measurement result.
3) The price advantage is obvious, and production and material cost are greatly reduced compared with photoelectric sensors, so that 30-50% of cost can be saved for the textile industry.
4) The invention adopts a unique and novel coil structure and a signal processing mode, overcomes the defect of short detection distance of the traditional inductive sensor, and improves the detection distance by 4-5 times compared with the detection distance of the sensor with the same specification.
5) The method has the advantages of eliminating fixed strong background interference, tracking and detecting the metal background (the steel collar) in real time, eliminating the influence of background change, realizing the real-time tracking of the steel collar, facilitating the replacement of the steel collar in actual use without manually arranging a sensor, and saving a large amount of manpower in the textile industry.
Drawings
FIG. 1 is a schematic view of the installation of the present invention
FIG. 2 is a schematic block diagram of the present invention
FIG. 3 shows a square wave/triangular wave conversion circuit according to the present invention
FIG. 4 is a waveform diagram of a triangular wave signal according to the present invention
FIG. 5 is a schematic view of a coil structure according to the present invention
FIG. 6 shows a coil resonance circuit according to the invention
FIG. 7 shows an operational amplifier circuit according to the present invention
FIG. 8 shows a second order band-pass filter circuit according to the present invention
FIG. 9 illustrates a peak detection circuit according to the present invention
Wherein: 1. traveller, 2. Ring, 3. Eddy current sensor
Detailed Description
The following describes embodiments of the present invention in detail, and the embodiments are developed based on the technical solutions of the present invention, and provide detailed implementation manners and specific operation procedures.
The spinning frame traveller is sleeved on the edge protruding from the ring, also called a track, and during spinning, the yarn drives the traveller to rotate on the ring track, so that the traveller rotates for a circle, and then the yarn is twisted.
The height of the steel collar and the steel wire ring is opposite to that of the ring, and an eddy current sensor is arranged as shown in figure 1.
The MCU generates a square wave signal with fixed frequency, the square wave signal is converted into a triangular wave signal through the triangular wave generator, and the electric eddy current sensor coil is driven by constant voltage amplitude to form a stable sine wave signal.
When the resonance frequency of the coil detection loop is consistent with the frequency of the driving signal, resonance is generated, the coil of the eddy current sensor can induce a signal which is several times of the driving voltage, an alternating magnetic field is generated around the coil, when the steel wire ring rotates in the magnetic field, a magnetic line of force can be cut to induce reverse eddy current, a secondary magnetic field generated by the eddy current and an original magnetic field are superposed to change the current of the coil, and because the positions of the two coils relative to the steel wire ring are different, the current variation in the coil is different, and the difference signal is detected by a signal processing circuit at the back.
One path of the signal is used for detecting a ring background signal and tracking whether the position of a ring changes or not through operational amplification, filtering and peak detection, and the other path of the signal is used for detecting a steel wire ring signal;
the MCU processes and calculates the detection signal of the peak value detection circuit, the background signal voltage is subtracted from the detected bead ring peak value voltage to obtain an offset, half of the offset and the background signal voltage are threshold values, the bead ring peak value signal is judged if the offset is larger than the threshold value signal, the time interval of two continuous bead ring peak value signals is a period T, and the reciprocal 1/T of the period is the rotating speed. And interference and noise are filtered through an algorithm to obtain an accurate result, and the rotating speed data is transmitted to an upper computer through a CAN bus to be processed.
The above embodiments are preferred embodiments of the present application, and those skilled in the art can make various changes or modifications without departing from the general concept of the present application, and such changes or modifications should fall within the scope of the claims of the present application.
Claims (2)
1. The spinning frame steel wire ring rotating speed detection device is characterized in that:
the device comprises an MCU control circuit, a square wave triangular wave conversion circuit, a coil detection circuit and a signal processing circuit;
an eddy current sensor (3) is arranged on the steel ring (2) and the steel wire ring (1);
the MCU generates a square wave signal with fixed frequency, the square wave signal is converted into a triangular wave signal through a triangular wave generator, a coil of the eddy current sensor is driven by constant voltage amplitude, and a stable sine wave signal is formed at the coil;
the coil detection circuit adopts an eddy current sensor coil and a resonance capacitor to form a resonance loop, the coil is arranged at two ends of a bar-shaped soft magnetic material to form an eddy current sensor probe, and one end of the bar-shaped soft magnetic material, of which two ends are provided with the coil, is arranged close to the steel wire ring;
the signal processing circuit consists of an operational amplifier, a second-order band-pass filter and a peak detection circuit, wherein two paths of signals sampled from the coil are subjected to differential amplification to remove common-mode background signals of the ring and the ambient temperature, useful signals are taken out through the second-order band-pass filter network and are respectively sent to the two paths of peak detection circuits for detection, one path is used for detecting the ring background signals and tracking whether the position of the ring changes, and the other path is used for detecting the steel wire ring signals;
the MCU processes and calculates the detection signal of the peak detection circuit, the offset is calculated by subtracting the background signal voltage from the detected bead ring peak voltage, half of the offset and the background signal voltage are taken as threshold values, the bead ring peak signal is judged to be greater than the threshold value signal, the time interval of two continuous bead ring peak signals is a period T, and the reciprocal 1/T of the period is the rotating speed.
2. The spinning frame traveler spool rotation speed detection device according to claim 1, wherein the MCU generates a fixed frequency square wave signal with 50% duty cycle.
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| CN201710812441.5A CN107385581B (en) | 2017-09-11 | 2017-09-11 | Spinning frame steel wire ring rotation speed detection device |
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| CN201710812441.5A CN107385581B (en) | 2017-09-11 | 2017-09-11 | Spinning frame steel wire ring rotation speed detection device |
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| CN107385581A CN107385581A (en) | 2017-11-24 |
| CN107385581B true CN107385581B (en) | 2022-10-04 |
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| CN110501575A (en) * | 2019-08-02 | 2019-11-26 | 苏州大学 | The quick micro- capacitance measurement system of superhigh precision |
| CN111122897B (en) * | 2019-12-23 | 2021-01-05 | 无锡物联网创新中心有限公司 | Spindle rotating speed capturing method in magnetoelectric single spindle detection system and related device |
| CN114280324B (en) * | 2021-12-30 | 2024-04-30 | 上海兰宝传感科技股份有限公司 | High-sensitivity spinning bead ring speed measuring method |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JP2526576B2 (en) * | 1987-04-08 | 1996-08-21 | 株式会社豊田自動織機製作所 | Stopping method in spinning machine |
| IT1238996B (en) * | 1990-02-14 | 1993-09-17 | Zugnago Tessile | THREAD PRESENCE CONTROL DEVICE FOR THREADERS |
| DE10347982A1 (en) * | 2003-10-15 | 2005-05-19 | Gebrüder Frei GmbH & Co. | Textile machine spinning ring has position sensor and display has hand-operated screwdriver-like main body with an independent electrical supply and analog sensor |
| CN102560770B (en) * | 2012-01-11 | 2014-08-13 | 王建波 | Automatic yarn breakage end detecting and jointing method and device utilizing same |
| JP5552662B2 (en) * | 2012-06-06 | 2014-07-16 | 株式会社豊田自動織機 | Spinning yarn detection device |
| CN203333895U (en) * | 2013-06-27 | 2013-12-11 | 顾金华 | Inductance-type broken yarn detecting mechanism of spinning machine |
| DE102013011921A1 (en) * | 2013-07-17 | 2015-01-22 | Saurer Germany Gmbh & Co. Kg | Ring spinning machine with a sensor for detecting the movement of the ring traveler |
| CN204738079U (en) * | 2015-04-20 | 2015-11-04 | 杭州电子科技大学 | Spun yarn broken wire detection apparatus of twin coil electromagnetic induction difference formula |
| DE102015013617A1 (en) * | 2015-10-20 | 2017-04-20 | Saurer Germany Gmbh & Co. Kg | Ring spinning machine with a sensor for monitoring a thread and method for operating the sensor |
| CN105369412B (en) * | 2015-11-12 | 2018-08-31 | 山东大学（威海） | A kind of spinning frame burn out detection sensing device of adaptive measuring distance |
| CN106192102A (en) * | 2016-09-27 | 2016-12-07 | 宁波英唐信息科技有限公司 | A kind of induction spinning frame broken thread detector of band self-checking function |
| CN106939455B (en) * | 2017-05-20 | 2023-10-13 | 杭州电子科技大学 | Yarn breakage detection circuit of ring spinning frame |
| CN207244082U (en) * | 2017-09-11 | 2018-04-17 | 上海兰宝传感科技股份有限公司 | A kind of spinning frame wire loop speed detector |
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