CN105133104A - Method and apparatus for online detecting and cleaning up compact spinning yarn grid ring failure yarn faults - Google Patents
Method and apparatus for online detecting and cleaning up compact spinning yarn grid ring failure yarn faults Download PDFInfo
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- CN105133104A CN105133104A CN201510460927.8A CN201510460927A CN105133104A CN 105133104 A CN105133104 A CN 105133104A CN 201510460927 A CN201510460927 A CN 201510460927A CN 105133104 A CN105133104 A CN 105133104A
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Abstract
The invention discloses a method and apparatus for online detecting and cleaning up compact spinning yarn grid ring failure yarn faults. The method comprises the following steps of acquiring a yarn linear density signal, acquiring a voltage signal in direct proportion to the yarn linear density, acquiring a yarn VC% spectrogram via time domain analysis, acquiring a yarn signal power spectrum chart via frequency domain analysis and calculating a characteristic value of a characteristic function, and making a comparison between the characteristic value and a normal spectrum chart. When the comparison meets a grid ring yarn fault condition, the yarn of the section has grid ring yarn faults; and the yarn of the section is determined whether to be cut off according to the comparison between the VC% and the characteristic value. Yarn faults of the compact spinning yarn due to grid ring failure can be detected online; and the grid ring failure yarn faults can be cleaned up as needed.
Description
[technical field]
The present invention relates to the winding procedure of spinning industry yarn production, particularly a kind of on-line checkingi and method and the device thereof of removing Compact-spun Yarn: grid ring fault yarn defect.
[background technology]
Compact spinning is a kind of spinning method that current spinning industry generally uses; Grid ring is a peculiar part in " compact spinning " operation.Grid ring is unclean all can cause Compact-spun Yarn: fault with breakage, and grid loop yarn defect affects very serious when weaving cotton cloth.The damage of grid ring or clean bad meeting cause the yarn defect of specific form, and different from the feature of traditional yarn defect, conventional yarn checkout gear cannot detect.At present, directly do not measure the method for tightening weave net ring fault yarn defect, can only indirectly testing yarn evenness index (as CV%).CV% value is an index during conventional yarn detects.Whether there is grid ring fault yarn defect by CV% fluction analysis, " grid loop yarn defect " that minority distortion degree is very serious, owing to causing the severe overweight of yarn CV%, can be found and remove; And major part " grid loop yarn defect " can not be found.
[summary of the invention]
For prior art Problems existing, the present invention proposes method and the device thereof of a kind of on-line checkingi and removing Compact-spun Yarn: grid ring fault yarn defect, the yarn defect that can cause due to grid ring fault at winding procedure on-line checkingi Compact-spun Yarn:, can remove grid ring fault yarn defect simultaneously on request.
For achieving the above object, the technical scheme that the present invention takes is:
A method for on-line checkingi and removing Compact-spun Yarn: grid ring fault yarn defect, comprises the following steps:
Obtain yarn linear density signal;
Obtain the voltage signal be directly proportional to yarn linear density;
Yarn signal average, CV% value is obtained by time-domain analysis, and amplitude singular point; The often property sent out defect detection;
Obtain the power spectrum chart of yarn signal by frequency-domain analysis, and structural feature function, calculate characteristic value in real time; Described characteristic value comprises the number at peak in power spectrum chart, peak position and energy barycenter position;
Characteristic value and normal power spectrogram are carried out Characteristic Contrast;
If comparison meets grid loop yarn defect feature, then tentatively judge that this section of yarn exists grid loop yarn defect;
In conjunction with the normal property sent out defect detection result, and the preliminary judged result of grid loop yarn defect, combine and differentiate Compact-spun Yarn: grid ring fault yarn defect.
As a further improvement on the present invention, peak refers to that the performance number of certain discrete point on the curve of power spectrum chart meets and is greater than more than 30% of its former and later two discrete point performance numbers; The position of main peak refers to that the maximum in all peak values is main peak, its in curve in coordinate system abscissa positions be the position of main peak; Energy barycenter position to refer on curve that the power spectral value of adjacent five discrete points on corresponding discrete point is sued for peace the energy curve obtained, wherein more maximum on energy curve energy value is energy barycenter, and the abscissa positions that energy barycenter is corresponding is energy barycenter position.
As a further improvement on the present invention, described Characteristic Contrast comprises:
The number at peak is more than or equal to 3; Substantial deviation normal position, energy barycenter position; Peak position departs from normal position;
If at least one, meet grid loop yarn defect feature more than meeting.
As a further improvement on the present invention, described normal power spectrogram refers to the spectrogram of the power spectrum of normal yarn after average value processing.
A kind of on-line checkingi and removing Compact-spun Yarn: grid ring fault yarn defect device, comprise the capacitance sensor for obtaining yarn linear density signal and the multiple processing units corresponding with capacitance sensor;
Processing unit comprises:
First detection module, for yarn linear density signal is carried out time-domain analysis, exports yarn amplitude, average, CV% value; And the normal property sent out defect detection;
Second detection module, for carrying out power spectrumanalysis in a frequency domain to yarn signal, differentiates that whether yarn is containing grid loop yarn defect; Comprise:
AD conversion unit, for converting analog signal to data signal;
Digital filtering unit, for carrying out digital filtering process by data signal;
Characteristic function structural unit, for setting up the characteristic function of power spectrum chart;
Characteristic value computing unit, for rated output spectrum, and the characteristic function of power spectrum chart;
Characteristic value contrast unit, for comparing the yarn characteristic value of real-time testing and the power spectrum chart characteristic value of normal yarn;
Judging unit, according to the aspect ratio pair of characteristic value contrast unit, carries out judging whether yarn exists grid loop yarn defect.
Also comprise transducer, signal amplifier, conditioning wave filter;
Described transducer is connected with capacitance sensor, and capacitance sensor is connected with signal amplifier; Then be divided into two-way, a road connects first detection module; Conditioning wave filter of separately leading up to connects the second detection module.
The characteristic value of described characteristic function comprises the number at peak in power spectrum chart, the position of main peak and energy barycenter position, if the number meeting peak is more than or equal to 3 and/or substantial deviation normal position, energy barycenter position and/or peak position and departs from normal position, then judge that this section of yarn exists grid loop yarn defect.
Compared with prior art, the present invention has the following advantages:
Method of the present invention analyzes the fault of yarn more accurately by time domain and frequency domain dual-channel analysis, wherein frequency-domain analysis is by characteristic value comparison, analyze the characteristic value of the yarn defect of grid ring yarn and the difference of normal yarn defect more accurately, and then analyze yarn and whether there is grid loop yarn defect.To construct and the characteristic function used comprises " number at peak ", " peak position " and " energy barycenter of spectrum ".By analysing and comparing, conventional grid loop yarn defect problem all can be detected.And combine by combining the normal property sent out defect detection the grid ring fault yarn defect differentiating yarn.Substantially grid ring fault yarn defect can both detect, and ensures the yield of the grid ring of actual production.
This device uses analog filter to do pre-treatment in signal condition passage, uses software simulating digital filter bank in post processing, carries out power Spectral Estimation to measured signal.Characteristic function more than binary to the distinctive latent structure of grid loop yarn defect.This device has time domain and frequency domain dual-channel analysis concurrently, and collection signal is simple, processes calculating and the comparison of carrying out characteristic value mainly through software, can analyze grid loop yarn defect problem accurately.The yarn defect that can cause due to grid ring fault at winding procedure on-line checkingi Compact-spun Yarn:, can remove grid ring fault yarn defect simultaneously on request.Practice guiding action is had to actual production grid ring.This device is ultra-small volume micropower circuit module (28*23*2).
[accompanying drawing explanation]
Fig. 1 is the CV% curve comparison figure of normal yarn and the yarn containing grid loop yarn defect.
Fig. 2 is on-line checkingi of the present invention and the device schematic diagram removing Compact-spun Yarn: grid ring fault yarn defect.
Fig. 3 is on-line checkingi of the present invention and the schematic diagram of device removing Compact-spun Yarn: grid ring fault yarn defect.
Fig. 4 is on-line checkingi of the present invention and the method flow diagram removing Compact-spun Yarn: grid ring fault yarn defect.
Fig. 5 a and Fig. 5 b is respectively normal power spectrogram and there is grid loop yarn defect power spectrum chart comparison example figure.
[detailed description of the invention]
Below in conjunction with accompanying drawing, the present invention is described in further detail, and the explanation of the invention is not limited.
As shown in Figure 2, at Compact-spun Yarn: winding procedure, the device of a kind of on-line checkingi of the present invention and removing Compact-spun Yarn: grid ring fault yarn defect, comprises the system of multiple capacitance sensor and the multiple processing units compositions corresponding with it.Compact-spun Yarn: exports the irregular signal of thickness of yarn by capacitance sensor.Irregular for thickness of yarn signal is divided into multichannel and send multiple processing unit to carry out multiple characteristic value process by system.The often property the sent out fault process of the normal property sent out fault processing unit is sent on one tunnel, exports details, slubbing and cotton knot; Frequency domain process unit is sent on another road, as the module that grid loop yarn defect detects.This module is carried out " power spectrumanalysis " in a frequency domain yarn signal, mathematical modeling is carried out to the specific characteristic that grid loop yarn defect shows on power spectrum, by calculating the characteristic value (more than binary) of characteristic function, differentiate that whether yarn is containing grid loop yarn defect.
Concrete, as shown in Figure 3, flat capacitance sensor gathers yarn linear density signal, pass to transducer, obtain the voltage signal be directly proportional to yarn linear density, then be divided into two-way by signal condition amplifier, analog-to-digital conversion of leading up to is connected with the first processing unit carries out time-domain analysis; Another road first through conditioning wave filter, enters the second data processing unit, successively connection mode number converter, digital filter bank, carries out the calculating of signature analysis function, obtain characteristic value, carry out aspect ratio pair, judged whether grid loop yarn defect.Whether end product is reached a conclusion in conjunction with the first processing unit, be the fault excised.
As shown in Figure 4, there is the yarn of grid ring fault yarn defect, after time-domain analysis, may respective change be there is in CV% value and cotton knot quantity, its power spectrum chart can show specific characteristic simultaneously, the power spectrum characteristic of extraction and standard spectrum according to the CV% value and the cotton knot quantity that exceed certain excursion, and are compared by system, finally determine whether it is tightening weave net ring fault yarn defect and are excised.
As shown in figure 5 a and 5b, the characteristic function of the present invention's structure contains three principal characters: one is the number at peak in power spectrum, and two is the positions of main peak in power spectrum, and three is energy barycenter positions of power spectrum.
Characteristic function structural unit structural feature function is specially: peak function refers to that performance number is greater than its previous performance number and is greater than a performance number thereafter in the curve of power spectrum chart, in order to more effective practical operation and obtain relatively significantly peak value, require the previous peak value of this peakedness ratio and a rear peak value all large 30%.The position of main peak refers to that the maximum in all peak values is main peak, its abscissa positions in coordinate system in curve.Energy barycenter position to refer on curve that the power spectral value of adjacent five discrete points on corresponding discrete point is sued for peace the energy curve obtained, wherein more maximum on energy curve energy value is energy barycenter, and the abscissa positions that energy barycenter is corresponding is energy barycenter position.
By analyzing three main characteristic values, characteristic value in contrast normal power spectrogram, if the number meeting peak is more than or equal to 3 and/or substantial deviation normal position, energy barycenter position and/or peak position and departs from normal position, then judge that this section of yarn exists grid loop yarn defect.
As can be seen from Fig. 5 a, normal power spectrum chart peak number is one, and the position at peak and energy barycenter position are all near peak position; Fig. 5 b contrast can be found out, there is the number three at grid loop yarn defect power spectrum chart peak, the power spectrum chart of the position compared with normal of peak position and energy barycenter departs from all to some extent.Demonstrate this section of yarn too and there is grid loop yarn defect.In actual production, need this section of yarn to remove, to ensure the yield of production grid ring.
Claims (7)
1. a method for on-line checkingi and removing Compact-spun Yarn: grid ring fault yarn defect, is characterized in that, comprise the following steps:
Obtain yarn linear density signal;
Obtain the voltage signal be directly proportional to yarn linear density;
Yarn signal average, CV% value is obtained by time-domain analysis, and amplitude singular point; The often property sent out defect detection;
Obtain the power spectrum chart of yarn signal by frequency-domain analysis, and structural feature function, calculate characteristic value in real time; Described characteristic value comprises the number at peak in power spectrum chart, peak position and energy barycenter position;
Characteristic value and normal power spectrogram are carried out Characteristic Contrast;
If comparison meets grid loop yarn defect feature, then tentatively judge that this section of yarn exists grid loop yarn defect;
In conjunction with the normal property sent out defect detection result, and the preliminary judged result of grid loop yarn defect, combine and differentiate Compact-spun Yarn: grid ring fault yarn defect.
2. according to the on-line checkingi shown in claim 1 and the method removing Compact-spun Yarn: grid ring fault yarn defect, it is characterized in that, peak refers to that the performance number of certain discrete point on the curve of power spectrum chart meets and is greater than more than 30% of its former and later two discrete point performance numbers; The position of main peak refers to that the maximum in all peak values is main peak, its in curve in coordinate system abscissa positions be the position of main peak; Energy barycenter position to refer on curve that the power spectral value of adjacent five discrete points on corresponding discrete point is sued for peace the energy curve obtained, wherein more maximum on energy curve energy value is energy barycenter, and the abscissa positions that energy barycenter is corresponding is energy barycenter position.
3., according to the on-line checkingi shown in claim 1 and the method removing Compact-spun Yarn: grid ring fault yarn defect, it is characterized in that, described Characteristic Contrast comprises:
The number at peak is more than or equal to 3; Substantial deviation normal position, energy barycenter position; Peak position departs from normal position;
If at least one, meet grid loop yarn defect feature more than meeting.
4., according to the on-line checkingi shown in claim 1 and the method removing Compact-spun Yarn: grid ring fault yarn defect, it is characterized in that, described normal power spectrogram refers to the spectrogram of the power spectrum of normal yarn after average value processing.
5. on-line checkingi and a removing Compact-spun Yarn: grid ring fault yarn defect device, is characterized in that, comprising the capacitance sensor for obtaining yarn linear density signal and the multiple processing units corresponding with capacitance sensor;
Processing unit comprises:
First detection module, for yarn linear density signal is carried out time-domain analysis, exports yarn amplitude, average, CV% value; And the normal property sent out defect detection;
Second detection module, for carrying out power spectrumanalysis in a frequency domain to yarn signal, differentiates that whether yarn is containing grid loop yarn defect; Comprise:
AD conversion unit, for converting analog signal to data signal;
Digital filtering unit, for carrying out digital filtering process by data signal;
Characteristic function structural unit, for setting up the characteristic function of power spectrum chart;
Characteristic value computing unit, for rated output spectrum, and the characteristic function of power spectrum chart;
Characteristic value contrast unit, for comparing the yarn characteristic value of real-time testing and the power spectrum chart characteristic value of normal yarn;
Judging unit, according to the aspect ratio pair of characteristic value contrast unit, carries out judging whether yarn exists grid loop yarn defect.
6. a kind of on-line checkingi according to claim 5 and removing Compact-spun Yarn: grid ring fault yarn defect device, is characterized in that, also comprise transducer, signal amplifier, conditioning wave filter;
Described transducer is connected with capacitance sensor, and capacitance sensor is connected with signal amplifier; Then be divided into two-way, a road connects first detection module; Conditioning wave filter of separately leading up to connects the second detection module.
7. according to the on-line checkingi shown in claim 5 and the method removing Compact-spun Yarn: grid ring fault yarn defect, it is characterized in that, the characteristic value of described characteristic function comprises the number at peak in power spectrum chart, the position of main peak and energy barycenter position, if the number meeting peak is more than or equal to 3 and/or substantial deviation normal position, energy barycenter position and/or peak position and departs from normal position, then judge that this section of yarn exists grid loop yarn defect.
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Cited By (3)
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| CN107043975A (en) * | 2017-03-29 | 2017-08-15 | 东华大学 | A kind of electronic yarn clearer filtered based on hardware FFT |
| CN107059169A (en) * | 2017-05-08 | 2017-08-18 | 李先登 | The method that spinning fault is reduced with the second drafting theory |
| CN113046875A (en) * | 2021-01-29 | 2021-06-29 | 宁波新材料科技城犀鸟工业设计有限公司 | Ring spinning flaw product removing device |
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| CN107043975A (en) * | 2017-03-29 | 2017-08-15 | 东华大学 | A kind of electronic yarn clearer filtered based on hardware FFT |
| CN107043975B (en) * | 2017-03-29 | 2019-11-08 | 东华大学 | A kind of electronic yarn clearer based on hardware FFT filtering |
| CN107059169A (en) * | 2017-05-08 | 2017-08-18 | 李先登 | The method that spinning fault is reduced with the second drafting theory |
| CN113046875A (en) * | 2021-01-29 | 2021-06-29 | 宁波新材料科技城犀鸟工业设计有限公司 | Ring spinning flaw product removing device |
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