EP2938443A1 - Verfahren zum erkennen und klassifizieren von elektromagnetisch detektierbaren teilen, insbesondere von fördergutteilen in einem schüttgut - Google Patents
Verfahren zum erkennen und klassifizieren von elektromagnetisch detektierbaren teilen, insbesondere von fördergutteilen in einem schüttgutInfo
- Publication number
- EP2938443A1 EP2938443A1 EP13827001.2A EP13827001A EP2938443A1 EP 2938443 A1 EP2938443 A1 EP 2938443A1 EP 13827001 A EP13827001 A EP 13827001A EP 2938443 A1 EP2938443 A1 EP 2938443A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- bulk material
- sensor
- signal
- electromagnetic
- coil
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 239000013590 bulk material Substances 0.000 title claims abstract description 46
- 238000000034 method Methods 0.000 title claims abstract description 30
- 239000000463 material Substances 0.000 title abstract description 10
- 230000005284 excitation Effects 0.000 claims abstract description 33
- 230000036962 time dependent Effects 0.000 claims abstract description 8
- 230000010363 phase shift Effects 0.000 claims description 10
- 238000011156 evaluation Methods 0.000 claims description 6
- 230000002123 temporal effect Effects 0.000 description 5
- 238000001514 detection method Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 4
- 230000015572 biosynthetic process Effects 0.000 description 3
- 238000011161 development Methods 0.000 description 3
- 230000018109 developmental process Effects 0.000 description 3
- 230000005672 electromagnetic field Effects 0.000 description 3
- 238000005070 sampling Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 239000007769 metal material Substances 0.000 description 2
- 238000005457 optimization Methods 0.000 description 2
- 238000001228 spectrum Methods 0.000 description 2
- 238000003786 synthesis reaction Methods 0.000 description 2
- 230000009466 transformation Effects 0.000 description 2
- 230000005290 antiferromagnetic effect Effects 0.000 description 1
- 239000010953 base metal Substances 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 230000006870 function Effects 0.000 description 1
- 230000007274 generation of a signal involved in cell-cell signaling Effects 0.000 description 1
- 230000012447 hatching Effects 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 229910000510 noble metal Inorganic materials 0.000 description 1
- 230000010355 oscillation Effects 0.000 description 1
- 238000007781 pre-processing Methods 0.000 description 1
- 230000004044 response Effects 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 238000010561 standard procedure Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 239000002918 waste heat Substances 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B07—SEPARATING SOLIDS FROM SOLIDS; SORTING
- B07C—POSTAL SORTING; SORTING INDIVIDUAL ARTICLES, OR BULK MATERIAL FIT TO BE SORTED PIECE-MEAL, e.g. BY PICKING
- B07C5/00—Sorting according to a characteristic or feature of the articles or material being sorted, e.g. by control effected by devices which detect or measure such characteristic or feature; Sorting by manually actuated devices, e.g. switches
- B07C5/34—Sorting according to other particular properties
- B07C5/344—Sorting according to other particular properties according to electric or electromagnetic properties
Definitions
- the invention relates to a method for detecting and classifying electromagnetically detectable parts, in particular articles to be conveyed in a bulk material, with the steps: approximation of the sensor arrangement to the electromagnetically detectable part by carrying out a relative movement between the sensor arrangement and the electromagnetically detectable part, until this is located in the sensor region of the sensor arrangement, wherein the sensor arrangement has at least one electromagnetic sensor which has at least one exciter coil for emitting an electromagnetic exciter field and at least one detector coil; Impinging the excitation coil with a time-dependent excitation current; Measuring a time-dependent signal induced in the detector coil; Evaluate the signal to determine the electromagnetic properties of the electromagnetically detectable part.
- the following steps are carried out: provision of a bulk material stream; Conveying the stream of bulk material along a sensor arrangement and through the sensor region of the sensor arrangement, the sensor arrangement having at least one electromagnetic sensor which has at least one exciter coil for emitting an electromagnetic exciter field and at least one detector coil; Impinging the excitation coil with a time-dependent excitation current; Measuring a time-varying signal current induced in the detector coil; Evaluating the signal current to determine the electromagnetic properties of a portion of the stream of bulk material located in the sensor region of the sensor assembly.
- a method is known, for example, from EP 1 940 564 B1.
- the excitation coil of a special sensor arrangement which in addition to the exciter coil has two mutually offset and oppositely wound detector coils, subjected to an alternating current and thus generates an electromagnetic exciter field.
- the electrical signal induced by the exciter field in the detector coils is measured and evaluated. Due to the oppositely wound detector coils and by suitable difference signal formation only results from a significantly deviating zero total signal when the field of the exciter coil is distorted by a portion of the flow of bulk material, namely, when electromagnetically detectable counseler pass the sensor area of the sensor, ie other such with para-, dia-, ferro-, ferri- or antiferromagnetic properties.
- the object of the invention is to provide a method with which electromagnetically detectable parts, in particular items to be conveyed in a flow of bulk material, can be classified particularly easily and accurately.
- classifying is understood to mean the determination of characteristic electromagnetic properties of, for example, a material to be conveyed in a bulk material flow, by means of which the product to be conveyed is subsequently assigned to a specific substance class.
- metallic substances can be separated from non-metallic substances, or noble metals from base metals.
- certain types of stainless steel can be separated from each other on the basis of the electromagnetic properties. In a simple embodiment, this classification leads to a decision that a conveyed material is to be discharged from the bulk material flow or not.
- the method can detect a characteristic electromagnetic property of a material.
- the exciter current is generated by superimposing a plurality of sinusoidal waveforms of different frequencies, wherein the frequencies of the plurality of sinusoidal waveforms are each integer multiples of a common fundamental frequency.
- the temporal course of the exciter current is thereby a superimposition of several sinusoidal courses of different frequencies.
- the exciting field generated and emitted by the at least one excitation coil also represents a superimposition of the multiple sinusoidal courses of different frequencies.
- the invention is based on the recognition that the classification of e.g. contained in a bulk flow, responsive to the excitation field counselguter can be particularly easily done when the electromagnetic response is determined not only at a frequency but at several different frequencies. While this can be done by different exciter field shapes, such as e.g. by a Dirac pulse, a white noise, or a continuous tuning of the excitation frequency as a sweep or chirp signal, it has been found that an excitation field designed according to the invention can be handled particularly well both in the generation and in the evaluation.
- the invention will be discussed below with reference to an application for the classification of conveyed goods and explained to allow the sorting of the conveyed goods by means of the classification.
- the method is more generally usable, e.g. also in measuring instruments, e.g. Portable measuring devices that only serve to obtain measurement results without being integrated into a sorting system.
- the excitation field (or the underlying exciting current) is preferably generated by the so-called direct digital synthesis (DDS).
- DDS direct digital synthesis
- values stored in a memory are read out in a fixed time sequence and converted into an analog voltage signal via a digital-to-analog converter, which is then converted via an analogue voltage signal Amplifier arrangement is supplied as excitation current to the excitation coils. After reading out a defined number of values, the value sequence is read again from the beginning. In this case, unavoidable power losses occur in the amplifier arrangement, which pollute the entire sensor arrangement as waste heat.
- the efficiency of the amplifier arrangement ie the ratio of the useful power to the power loss, not only depends on the quality of the amplifier arrangement, but also substantially on the waveform of the excitation current.
- the efficiency is higher, the lower the crest factor of the signal (or of the exciting current), wherein the crest factor is defined as the ratio of the peak value to the rms value of the signal curve. This is essentially due to the fact that only the real parts of the complex signal curves contribute to the net output, while the power losses also contribute to the imaginary parts, which cancel each other out on a temporal average.
- the sinusoidal waveforms to the individual frequencies are out of phase with each other, the crest factor of the overall signal at the same power in the individual frequency components can be reduced, whereby the efficiency of the amplifier arrangement increases and the heat load of the sensor arrangement is reduced.
- phase shift ⁇ of the individual sinusoidal courses relative to the course of the fundamental frequency corresponds to either 0 ° or 180 °. This limitation of the possible phase shifts simplifies the optimization of the signal to achieve the lowest possible crest factor. At the same time this ensures that the start value of the total signal at startup is always zero, so that disturbing signal peaks when "switching on" can be avoided.
- the phase shifts ⁇ of the individual sinusoidal curves are selected so that the resulting total signal has a crest factor of less than 3, preferably less than 2.5. At these crest factors, the efficiency of the amplifier arrangement is sufficiently high to avoid an undesirably high heat load on the sensor arrangement.
- the product (90 ° x (S (n-1)) gives either + 90 ° or -90 °, since the Rudin-Shapiro series is composed only of the numbers 1 and -1.
- this easily calculated formula gives a total signal with the crest factor less than 3.
- the number of superimposed frequencies ie the individual sinusoidal curves of different frequencies, which are summed up to form the excitation signal, can in principle be chosen freely. If according to a further preferred embodiment of the invention, the number of superimposed frequencies is an integer power of 2, the result is a maximum crest factor of 2, which allows a very favorable efficiency of the amplifier arrangement.
- the common fundamental frequency of the frequency components between 100 Hz and 10 kHz, preferably at 1 kHz. This frequency range, with reasonable switching and computational effort, provides good results in the detection and classification of the conveyed material parts of the bulk material that respond to electromagnetic fields
- the number of superposed frequencies is 64.
- the individual frequency components are separated from one another in a frequency analysis, and the amplitude and / or phase position are determined for these frequency components.
- the evaluation of the induced signal comprises a fast Fourier transformation (FFT).
- FFT fast Fourier transformation
- the sampling rate of the analog-to-digital converter is an integer multiple of the output rate of the digital-to-analog converter and the number of output values is selected to an integral power of 2, the computational resolution of the fast Fourier Transformation are particularly well exploited
- FIG. 1 shows a schematic representation of a plant for sorting bulk material
- FIG. 2 shows an exemplary embodiment of a sensor arrangement for use in a method according to the invention
- FIG. 3 shows an exemplary circuit arrangement for use in a method according to the invention
- Fig. 5 the phase and amplitude spectrum of the exciting current in an embodiment of the invention
- FIG. 1 shows a plant 10 for sorting bulk material 15, 15 ', 15 ", 16, 16', 16", which is transported in the form of a bulk material flow 13 on a first conveyor belt 12 in a conveying direction.
- the first conveyor belt 12 is deflected around a roller 27.
- the bulk material falls 15, 15 ', 15 ", 16, 16', 16” from the first conveyor belt 12 and falls under the influence of its inertia on a second conveyor belt 42, which the bulk material 16, 16 ', 16 " ab vitamint.
- the bulk material consists of different materials 15, 15 ', 15 "and 16, 16', 16", which are to be sorted out in the sorting system.
- a tuyere 24 is arranged, which is supplied controlled by a valve 26 from a compressed air source 34, and upon opening of the valve 26 a falling bulk material part 15 'deflects so that it over a separating vertex 36 away on a third conveyor belt 40, which discharges the bulk material part 15 "separately, in order to ensure a clean separation of the different bulk material parts 15, 15 ', 15", 16, 16', 16 ", the bulk material flow 13 is preferably supplied as a singly isolated stream
- additional separating means such as comb rollers or the like may be required for fibrous bulk material.
- the control of the valve 26 is effected by a controller 20, which receives signals from a sensor assembly 14 which is arranged in the region of the first conveyor belt 12, below the conveyor belt and in the conveying direction in front of the guide roller 27.
- a speedometer 29 is additionally provided on the roller 27, for example a protractor.
- a drive signal for the valve 26 is generated when the sensor assembly 14 detects the presence of a
- This signal takes into account a certain delay time to take into account the transit time of the bulk material part 15 'from the sensor area via the deflection roller 27 to before the tuyere 24.
- the duration of the delay depends on the speed of the conveyor belt 12 and possibly also on the nature of the bulk material 15' , So, for example, for light bulk goods 15 'wait a higher delay than heavy bulk goods.
- the sensor arrangement 14 is used to detect and distinguish the different materials that make up the bulk material and is shown schematically in FIG.
- an excitation coil 102 is arranged, which generates upon application of a time-dependent excitation current via terminals 1 12 an electromagnetic alternating field.
- a detector coil 104 is arranged, which is surrounded by the excitation coil 102.
- the alternating electromagnetic field generated by the exciting coil 102 induces in the Detector coil 104, an electrical signal that can be tapped via terminals 1 14, for example as a signal voltage or as a signal stream.
- the generation of the excitation current for the application of the exciter coil 102 and the evaluation of the signal of the detector coil 104 is effected by a circuit arrangement 106, which communicates the result of the evaluation to the controller 20.
- a suitable sensor arrangement is described, for example, in EP 1 940 546 B1, to the contents of which reference is hereby made.
- a plurality of transverse to the conveying direction of the bulk material arranged side by side sensor arrangements may be provided.
- the electrical signal induced in the detector coil 104 is in turn fed via the terminals 114 to a measuring amplifier 205, which converts the signal into a voltage and is supplied to an analog-to-digital converter 206. This converts the voltage into a digital signal, which is evaluated by the processor 202.
- the arrangement of the coils 102,104 acts as a transformer, so that the time course of the excitation current and the induced signal are the same. Only when the field generated by the excitation coil 102 is influenced by a bulk material part 15, 15 ", 15", 16, 16 ', 16 ", a significant deviation of the temporal courses of excitation current and induced signal results, both in a phase shift and may be in an amplitude change, which is done by the processor
- the values of the signal curve may preferably be stored in an FPGA and this directly drive the analog-to-digital converter.
- a processor in the strict sense is then not needed.
- the preprocessing and first evaluation of the digital signal from the analog-to-digital converter ie the FFT and other calculations
- detector coil 104 or a detector coil pair
- two or more detector coils or detector coil pairs may be provided in order to increase the resolution capability.
- a corresponding sensor arrangement is described in EP 1 940 546 B1, to which reference is expressly made in this regard.
- the temporal course of the excitation current corresponds to a superimposition of sinusoidal curves of different frequencies, wherein the frequencies respectively correspond to integer multiples of a common fundamental frequency.
- electromagnetic fields of these frequencies are simultaneously generated, the influence of which can be evaluated by the bulk material separated from each other and so.
- Statements about conductivity, size, humidity etc. of the bulk material allow.
- FFT fast Fourier transform
- FIG. 1 An exemplary course of the exciter current according to an embodiment of the invention is shown in FIG.
- the time is plotted on the abscissa and the output voltage of the digital-to-analog converter 203 in volts is plotted on the ordinate.
- the number of frequency components should also correspond to an entire power of 2, in the present example 64 sinusoidal signals of different frequency were superimposed. This results in a fundamental frequency of 1 kHz frequency components of 1 kHz, 2 kHz, 3 kHz ... to 64 kHz, which can be easily processed with simple electronics.
- the sampling of the induced signal can, for example, be carried out at an easily manageable sampling frequency of approximately 1 MHz. This corresponds to a 16-fold oversampling of the highest frequency component, so that disturbing aliasing effects are almost impossible.
- phase position for all superimposed frequency components relative to one another is selected to be either 0 ° or 180 °.
- This phase position brings another advantage in the FFT analysis. As a rule, this works with a cosine function and as a result delivers phases of approximately + 90 ° or -90 °, depending on the respective phase shift of the induced signal relative to the exciting current. In these phases, unavoidable rounding errors of the FFT analysis may, on average, cancel out, while e.g.
- the calculated phases may be e.g. subsequently be offset back to the original phases 0 ° or 180 ° by an offset.
- the temporal course of the excitation current has a low crest factor (crest factor).
- crest factor crest factor
- reactive currents are reduced, which contribute only to the power loss, but not to the signal power.
- a large signal energy can be transported at a relatively low maximum value of the signal. It has been found that the crest factor should be below 3, preferably below 2.5.
- amplitudes and phase angles of the individual frequency components can be varied.
- a surprisingly good crest factor of 2 is achieved in the illustrated example by determining the phases of the frequency components based on the Rudin-Shapiro series and the number of frequency components is a power of 2.
- the Rudin-Shapiro series is a series of the numbers +1 and -1, where the nth value S (n) of the series is determined by how many times the bit sequence 1 1 occurs in the binary representation of the number n.
- the resulting amplitude and phase spectrum of the excitation current is shown in the two diagrams of FIG.
- the frequencies of the sinusoidal oscillations constituting the exciting signal are given in kHz, while along the ordinate of the lower diagram, the respective phase position is shown in degrees [°] (+ 90 ° or -90 °).
- the diagram already shows the phase angles that result when using a cosine-based FFT analysis, ie either -90 ° or + 90 °.
- the amplitudes of the individual frequency components in mV are plotted along the ordinate of the upper diagram in FIG.
- the amplitudes are chosen in the illustrated example so that all 64 sine signals of the 64 different frequencies occur in the excitation signal with the same signal amplitude.
Landscapes
- Geophysics And Detection Of Objects (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE102012025209 | 2012-12-28 | ||
| PCT/EP2013/003920 WO2014102011A1 (de) | 2012-12-28 | 2013-12-27 | Verfahren zum erkennen und klassifizieren von elektromagnetisch detektierbaren teilen, insbesondere von fördergutteilen in einem schüttgut |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP2938443A1 true EP2938443A1 (de) | 2015-11-04 |
| EP2938443B1 EP2938443B1 (de) | 2017-11-15 |
Family
ID=50068954
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP13827001.2A Not-in-force EP2938443B1 (de) | 2012-12-28 | 2013-12-27 | Verfahren zum erkennen und klassifizieren von elektromagnetisch detektierbaren teilen, insbesondere von fördergutteilen in einem schüttgut |
Country Status (2)
| Country | Link |
|---|---|
| EP (1) | EP2938443B1 (de) |
| WO (1) | WO2014102011A1 (de) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113984877A (zh) * | 2021-10-25 | 2022-01-28 | 慈溪市亚路车辆配件有限公司 | 一种汽车安全带卡扣硬度检测工装以及检测方法 |
| CN116099655B (zh) * | 2023-01-13 | 2025-05-16 | 中北大学 | 一种基于涡流效应的非磁性金属分类装置及方法 |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5654638A (en) * | 1995-12-21 | 1997-08-05 | White's Electronics, Inc. | Plural Frequency method and system for identifying metal objects in a background environment |
| JP3443043B2 (ja) * | 1998-12-08 | 2003-09-02 | 三菱重工業株式会社 | 電池分別方法及びその装置 |
| US7674994B1 (en) * | 2004-10-21 | 2010-03-09 | Valerio Thomas A | Method and apparatus for sorting metal |
| DE102005048757A1 (de) | 2005-10-10 | 2007-04-19 | Oliver Gurok | Sensorvorrichtung zum Erkennen elektromagnetisch detektierbarer Fördergutteile und Sortiervorrichtung mit einer solchen Sensorvorrichtung |
| AT504527B1 (de) * | 2007-02-23 | 2008-06-15 | Evk Di Kerschhaggl Gmbh | Verfahren und vorrichtung zum unterscheiden von ein elektromagnetisches wechselfeld beeinflussenden objekten, insbesondere metallobjekten |
-
2013
- 2013-12-27 EP EP13827001.2A patent/EP2938443B1/de not_active Not-in-force
- 2013-12-27 WO PCT/EP2013/003920 patent/WO2014102011A1/de not_active Ceased
Also Published As
| Publication number | Publication date |
|---|---|
| EP2938443B1 (de) | 2017-11-15 |
| WO2014102011A1 (de) | 2014-07-03 |
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