KR100282081B1 - Electronic device - Google Patents

Abstract

An object of the present invention is to provide an inspection apparatus capable of always performing feature extraction and seed breeding with a certain precision, even if there is a change in the external environment or an internal factor.

A plurality of windings are formed at predetermined intervals and include a coil for passing an inspection hardening in the hollow portion of the winding portion, and a self-oscillating circuit for generating an oscillation signal by cooperation with the coil. Specific change in the frequency and amplitude of the oscillation signal accompanied by a change in the impedance and inductance of each annular coil due to the action of the eddy current generated in the inspection hardening by the magnetic field generated in this coil when the inspection hardening passes through the unit. It was set as the structure which extracts as a characteristic.

Description

Inspection device

1 is a diagram illustrating the configuration of a sensor unit according to an embodiment of the present invention.

2 is a circuit diagram showing the configuration of a detection circuit of one embodiment.

3 is a characteristic diagram illustrating an inspection power of an embodiment.

4 is an explanatory diagram for explaining a test operation of an embodiment;

<Explanation of symbols for main parts of drawing>

1: cylinder 2: inspection hardening

3: hollow hole 4, 5, 6, 7: flange portion

8: copper wire 9, 10: winding part

11, 12: terminal 13, 14, 15, 26: core

17: comparator C1, C2: condenser

18: resistance Rf: feedback resistance

19: frequency detection circuit 20: envelope detection circuit

21: judgment circuit

TECHNICAL FIELD The present invention relates to an inspection apparatus which performs an electrical and magnetic principle of an electrical inspection process such as a curing coefficient or a curing screen, and more particularly, an electrical inspection for improving the accuracy of the electrical inspection. Relates to a device.

Conventionally, the inventor of the present application has disclosed a metal body identification device having a novel and excellent detection characteristic in Japanese Patent Application Laid-open No. 3-34620.

Such a metal body identification device is provided with a plurality of oscillation circuits which oscillate by LC resonant action with a coil wound in an annular shape, and a plurality of annular coils are arranged at predetermined intervals to form these annular rings. The characteristics of the specimen hardening can be detected by detecting the material of the specimen hardening from the change of the oscillation signal frequency of the alternating current obtained when the specimen hardening passes through the hollow of the coil, and also by detecting the diameter and thickness of the specimen hardening from the amplitude change. This is a significant improvement in extraction accuracy.

Moreover, various types of inspection apparatuses employing such electrical and magnetic principles have been known in the past, but the metal body identification apparatus of the present invention carries out the inspection by passing the inspection hardening in the hollow of the annular coil in which the magnetic field is generated. Since the precision can be remarkably improved, it has little effect on mechanical precision such as assembly accuracy, and thus exhibits a very excellent effect.

By the way, in the inspection apparatus to which such a prior art is applied, the plurality of annular coils of the metal body identification device constitute an oscillation circuit independent of each other, so that an oscillation signal independent from each oscillation circuit is generated. By examining the changes in frequency and amplitude and comprehensively evaluating these changes, feature extraction of the cured test piece was performed, and the type of the test hardening was determined based on the result of the feature extraction.

However, according to the separate annular coil and the oscillation circuit, the characteristics of the frequency and the amplitude of each oscillation signal are changed independently due to the external environment of the place where the test apparatus is installed, the secular variation of the component electronic components, etc. Occasionally, a different characteristic from the initial state set in advance occurs.

If the frequency and amplitude of each oscillation signal are interlocked with each other and change in a constant direction, the feature extraction precision remains relatively constant, but in practice, the feature extraction precision fluctuates irregularly, thus degrading the feature extraction precision. Furthermore, there existed a problem that the determination precision of a gold seed also fell.

Moreover, in order to solve such a problem, a technique of measuring a specific change necessary for feature extraction of frequency and amplitude of each oscillation signal, calculating the average value of each measurement result by statistical method, and performing feature extraction based on this average value In this case, there is a problem that signal processing is complicated, delayed inspection processing is delayed, and feature extraction is always possible because of statistical processing.

It is an object of the present invention to provide a test apparatus capable of always extracting features and determining the type of money with a certain precision, even if such a change in external environment or a change in internal factors occurs.

In order to achieve the above object, the inspection apparatus of the present invention includes a plurality of winding portions in which a pair of winding portions are electrically connected in series with each other at predetermined intervals, and a metal body is disposed in the hollow portion of the winding portion. One coil disposed so as to be identified by passing therethrough; In use, as the metal body passes through the hollow part of the winding part of the coil, the result is a change in the impedance and inductance of each winding part due to the action of the eddy current generated in the metal body by the magnetic field generated by the coil. A self-oscillating circuit configured to change the frequency and amplitude of the oscillation signal so that the oscillation signal is co-operated with the coil to generate an oscillation signal; A frequency detection circuit for detecting a change in frequency of the oscillation signal; An envelope detection circuit for detecting a change in amplitude of the oscillation signal; Identification means for determining the identity of the metal body on the basis of the characteristic data, using the characteristic data of the hardening under test as the characteristic data of the frequency signal output from the frequency detection circuit and the envelope detection signal output from the envelope detection circuit. It is characterized by one.

According to the inspection apparatus having such a structure, even if there are a plurality of winding portions for passing the inspection hardening, each winding portion is electrically connected to form one coil and acts together with the coil to generate an oscillation signal. Since only one oscillation circuit is generated, the change of the frequency and amplitude of the oscillation signal generated by the passage of the test hardening is determined by the oscillation signal, and the characteristic of the test hardening can be extracted based on the oscillation signal. do.

Therefore, the problem of the reduction of the feature extraction precision resulting from the characteristic change of a separate coil and an oscillation circuit conventionally is solved fundamentally.

Best Mode for Carrying Out the Invention Embodiments of the present invention will be described below with reference to the drawings.

First, referring to FIG. 1, the structure of the sensor portion will be described. As shown in the same figure (a), a hollow hole 3 is formed in the cylinder 1 to allow the inspection hardening 2 to pass therethrough. The outer wall is provided with flange portions 4, 5 facing each other at a predetermined interval W1, and flange portions 6, 7 facing each other at a predetermined interval W2 (= W1), and the flange portions 5, 6 are predetermined. It is as far away as W3.

And this cylinder 1 and the flange parts 4, 5, 6, 7 are integrally shape | molded with plastic etc.

On the outer wall of the cylinder 1 fitted to the flanges 4 and 5 and the outer wall of the cylinder 1 fitted to the flanges 6 and 7, the same relatively thin copper wire 8 insulated and coated is wound by a predetermined number of turns T, respectively. As a result, a coil having the first winding portion 9 and the second winding portion 10 is formed, and both ends 11 and 12 of the copper wire 8 extend to the outside.

Also formed of ferrite, etc. &Quot; The core 13 of the shape is to be firmly coupled by fitting the flanges 4 and 5 from one direction, while the cores 14 of the same shape and material are fitted to the flanges 6 and 7 from the same direction. It is tightly coupled.

In addition, although the figure shows the disassembled state, the cores 15 and 16 are also made from the same shape and material as the cores 13 and 14, and the flange parts 4 and 5, so that the cores 13 and 14 may face the cores 13 and 14, respectively. 6 and 7).

Here, the space | interval W3 is set to the space | interval which is almost the same as the diameter of hardening with smallest diameter.

For example, in the inspection apparatus used in Japan, among coins of 1 yen, 5 yen, 10 yen, 50 yen, 100 yen and 500 yen in Japan, they are set at intervals slightly narrower than the diameter of the smallest 1 yen coin. .

In addition, the shape of the hollow hole 3 is designed in the shape similar to each other slightly larger than the cross section (for example, shown by the diagonal line AR in drawing) of the largest hardening.

Therefore, as shown to the same figure (b), hardening can pass through the hollow hole 3 by opening a little gap.

However, this hollow hole 3 is provided as a simple guide hole for passing hardening to the inside of the winding parts 9 and 10, and the passage position of hardening with respect to the winding parts 9 and 10 with high mechanical precision is provided. It is not intended to be prescribed.

Then, by connecting the oscillation circuit shown in FIG. 2 to both ends 11 and 12 of the coil, as shown in the principle diagram of FIG. The magnetic force lines 9a and 10a having a predetermined magnetic flux density are generated in advance, and the magnetic force lines 9a and 10a are acted upon when the inspected hardening 2 passes through the hollow hole 3.

Next, the detection circuit X added to the coil will be described based on FIG.

The capacitors C1 and C2 are connected in series between both ends 11 and 12 of the coil, and the terminal 11 is connected to the non-inverting input contact of the comparator 17, and the terminal 12 and the comparator 17 are connected. The inverting input contact of is connected to the ground contact.

However, you may reversely connect both ends 11 and 12 of a coil here.

The comparator 17 is operated with a power supply of a predetermined voltage, and its output contact is biased to the predetermined voltage Vcc through the resistor 18, and is connected to the common connection contact P of the capacitors C1 and C2 via the feedback resistor Rf. have.

In addition, since the inductance and impedance of the winding parts 9 and 10 change under the influence of the eddy current which occurs when the inspected hardening 2 passes, the impedance change is equivalently indicated by the symbol R in the figure. .

Moreover, the inductance L of the winding parts 9 and 10 changes theoretically in accordance with the following formula.

L = K.μ.M ² ㆍ S.ℓ.10 ^-7 [H]

Where K is the inductive coupling factor, L is the inductance, μ is the permeability of the hardening, M is the number of turns of the coil, S is the cross-sectional area of the coil, and l is the length of the coil (W1 and W2 in Figure 1. do)]

The circuit composed of these comparators 17, capacitors C1 and C2, resistors Rf and 18, and windings 9 and 10 constitutes a Colpitts oscillation circuit, and capacitors C1 and C2. And the oscillation signal S of the frequency and amplitude determined by the circuit constant of the tuning circuit composed of the winding sections 9 and 10 is generated at the terminal 11.

Then, when the inspection hardening 2 passes through the magnetic field generated by the windings 9 and 10, the amplitude and frequency of the oscillation signal S change according to the change in inductance and impedance. As shown, the amplitude changes according to the difference between the cross-sectional area AR and the diameter of the inspected hardening 2 (see also third (a) and (b)), and the frequency is increased according to the difference of the permeability of the hardening under test 2. The characteristic of changing (see also third (c)) is obtained.

The frequency detecting circuit 19 includes a waveform shaping circuit 19a for waveform shaping into two square wave signals F without changing the oscillation signal S, and the logic " 1 " And a measuring circuit which detects the frequency of the oscillation signal S by measuring the frequency of the oscillation signal S by measuring the frequency of occurrence of " 0 " and outputs the detection result as digital frequency data Df every predetermined period τ. 19b is provided.

The envelope detection circuit 20 performs an A / D conversion of the envelope detection circuit 20a for detecting the envelope of the correct amplitude voltage of the oscillation signal S, and the analog envelope signal A by digital amplitude data for each predetermined period τ. The A / D converter 20b which outputs as Da is provided.

Then, the frequency data Df and the amplitude data Da are input to the gold seed determination circuit 21, and gold seed determination is performed.

Moreover, the sensor part shown in FIG. 1 (a) is installed directly or through the conveyance mechanism through the hardening opening of the inspection apparatus so as to pass through the hollow hole 3 as the inspection hardening 2 naturally falls, for example. Used.

Next, the operation of the detection circuit X will be described based on FIG.

As shown in FIG. 1 (a), the inspected hardening 2 allows the inside of the hollow portions of the wound portions 9 and 10 to pass in the direction of the arrow Y along the hollow holes 3.

The relationship between the generated frequency of the envelope signal A, the amplitude data Da, the square wave signal F, and the frequency data Df is substantially the same as the relationship between the analog signal and the digital data, and thus will be described. For the sake of convenience, explanation will be given based on the analog envelope signal A and the square wave signal F. FIG.

Fig. 4 (a) shows the positional relationship between the cured test object 2 and the winding portions 9 and 10, the same figure shows the oscillation signal S, and the figure (b) shows the envelope signal A Waveform (c) indicates a square wave signal (F).

In FIG. 4, when the test hardening 2 is not inserted anywhere in the winding portions 9 and 10 as in any time t1, each winding in the state where the hardening of the test hard 2 and the magnetic field is not affected. An oscillation signal S having a constant frequency and amplitude determined by one of the inductances of the units 9 and 10 is generated (see also fourth (a)).

Along with this, the envelope signal A of the envelope detection circuit 20 also has a constant amplitude HO (see also the fourth (b)), and the frequency of generation of the square wave signal F of the frequency detection circuit 19 is also constant. [See also section 4 (c)].

Next, as shown at some point in time t2, when the tip portion of the inspection hardening 2 enters the hollow portion of the first winding portion 9, a eddy current is generated at the tip portion under the influence of the magnetic field. At the same time, the inductance and impedance R of the winding parts 9 and 10 change, and the frequency and amplitude of the oscillation signal S start to change, and at the same time, the amplitude of the envelope signal A decreases, and the square wave signal F The frequency of occurrence also begins to change.

Furthermore, in the case of the test hardening 2 made of a material having a higher permeability than air, as shown in FIG. 4 (c), the oscillation signal becomes larger as the overlapped areas of the test hardening 2 and the windings 9 and 10 become larger. The frequency of (S) is gradually lowered, and conversely, in the case of the test hardened material (2) made of a material having a lower permeability than air, the oscillation signal is increased as the overlapped area of the hardened test object (2) and the wound parts (9, 10) increases. The frequency of S) becomes high.

In addition, it shows the case where the inspected hardening | curing material 2 of material whose permeability is higher than air passes.

When the inspection hardening 2 proceeds into the hollow portion of the winding portion 9, the generation of the eddy current gradually increases, and according to the change, the frequency and amplitude of the oscillation signal S, the amplitude of the envelope signal A, and the square wave The frequency of occurrence of the signal F also changes.

Next, as shown at the time point t3, when the center portion of the inspected curing 2 coincides with the center portion of the winding portion 9, the eddy current generated in the inspected curing 2 is maximized and the oscillation signal S And the amplitude of the envelope signal A becomes the lowest value H1 as shown, and at the same time, the generation frequency of the square wave signal F becomes low.

Next, as the time-tested hardening 2 gradually escapes from the winding part 9, as between the time points t3 to t4, the frequencies of the oscillation signal S and the square wave signal F rise to the original state. In the same way, the amplitudes of the oscillation signal S and the envelope signal A also rise to their original state.

Then, as shown at time point t4, if the area of the tip portion of the inspection hardening 2 and the overlapping portion of the winding portion 10 and the rear end portion of the inspection hardening 2 and the portion of the winding portion 9 overlapping are the same. The oscillation signal S and the envelope signal A become the amplitude H2 corresponding to the overlapping portion thereof, and the oscillation signal S and the square wave signal F also become the frequency corresponding to the overlapping portion.

Next, as in the periods of the time points t4 to t5, if the rear end portion of the inspection-cured hardening 2 breaks out of the first winding portion 9 and gradually enters the second winding portion 10, the second winding portion 10 Due to the influence of the magnetic field, the eddy current generated in the cured object 2 increases, and the amplitude of the oscillation signal S and the envelope signal A gradually decreases, and the oscillation signal S ) And the generated frequency of the square wave signal F gradually decrease.

Next, after the time point t5, the test hardening 2 gradually escapes from the winding part 10, and the amplitudes of the signals S and A increase, and the frequency of the square wave signal F gradually increases to the state at the time point t1. After returning and the test hardening 2 completely escapes from the winding part 10 at the time point t7, the signals S, A, and F return to the same state as the time point t1.

Here, changes in the amplitudes of the signals S, A, and F and changes in the frequency of occurrence show intrinsic characteristics for each coin type of the inspected coin 2.

In particular, when the test hardening (2) having a large cross-sectional area AR becomes smaller, the minimum amplitudes H1 and H3 of the signals S and A become smaller, and when the hardening hardening (2) which has a larger permeability, the signals S and A become minimum amplitudes H1 and H3. Indicates that the generated frequency of the square wave signal F becomes low.

As a result of the experiment, the present inventors found that when the minimum amplitudes H1 and H3 correlate with the cross-sectional area AR of the specimen hardened (2), and the signal A becomes acidic, as shown at the time point t4 in FIG. Indicates that the amplitude H2 of C is correlated with the diameter of the hardening (2), and that the frequency generated when the signal A becomes the minimum amplitude H1 or H3 is correlated with the material (permeability) of the hardening (2). As a result, these were used as the characteristic data of the inspection hardening (2), so that the automatic control of this kind was made by the correction control circuit 21 which will be described later.

The determination circuit 21 is realized by a microcomputer system having an arithmetic function, and inputs the amplitude data Da and the frequency data Df for each predetermined period τ, and the amplitude data Da of the inputted amplitude data Da for each period τ. By comparing the magnitude relationship between the front and rear amplitudes one by one, the minimum amplitude H1 and H3 as shown in FIG. 4 (b), and the amplitude H2 at the time of mountain shape are detected.

The most agreement is made in comparison with the reference data of the minimum amplitudes H1 and H3 and the amplitude H2 when the shape of the mountain is pre-stored as a look-up table. The determination result Q which makes the gold type which has a value as the gold type of the test telephone hardening 2 is outputted.

As described above, according to the present embodiment, the oscillation signal S is provided when the test target hardening 2 passes by including an oscillation circuit which acts and oscillates together with one coil having two winding portions 9 and 10. Since specific features of the frequency change and the amplitude change of the feature are extracted as the feature data, the feature can be extracted from this one oscillation signal S.

Therefore, as in the prior art, a plurality of coils and respective oscillation circuit sensor portions that work with them are configured, and processing speed is faster than feature extraction by signal processing a plurality of oscillation signals output from each oscillation circuit. And the processing circuit is simplified.

In addition, since the respective oscillation circuits are not applied as in the related art, it is possible to reduce the accuracy of electromagnetism based on the irregular characteristic change of each oscillation circuit, thereby improving the electromagnetism accuracy.

As described above, according to the present invention, a plurality of winding portions are formed at predetermined intervals, and an oscillation signal is generated by acting together with one coil for passing the inspection hardening in the hollow portion of these winding portions. The self-oscillation circuit and the magnetic field generated in the coil when the test hardening passes through the hollow part of the winding part of the coil are operated by the eddy current generated in the test hardening to determine the impedance and inductance of each annular coil. A frequency detection circuit for detecting a frequency change of the oscillation signal in response to a change, an envelope detection circuit for detecting an amplitude change of the oscillation signal, a frequency signal output from the frequency detection circuit, and an envelope output from the envelope detection circuit A gold type determination circuit for determining the gold type by using the characteristic of the detection signal as the characteristic information of the hardening of the object to be inspected Therefore, even if there are a plurality of winding portions for passing the cured object, each winding portion is electrically connected to form one coil, and the self-oscillating circuit for generating an oscillation signal by working with the coil is also one. From the oscillation signal, the frequency and amplitude change of the oscillation signal caused by the passage of the test hardening is determined by the oscillation signal, and the characteristic of the test hardening can be extracted due to the oscillation signal.

Therefore, the problem of a reduction in the feature extraction precision due to the characteristic change of the separate coil and the oscillation circuit as in the prior art is fundamentally solved.

Claims (8)

A coil having a plurality of winding parts electrically connected in series with each other at predetermined intervals, the pair of winding parts being arranged to be identified by passing a metal body through the hollow part of the winding part; In use, as the metal body passes through the hollow part of the winding part of the coil, the result is a change in the impedance and inductance of each winding part due to the action of the eddy current generated in the metal body by the magnetic field generated by the coil. A self-oscillating circuit configured to change the frequency and amplitude of the oscillation signal so that the oscillation signal is co-operated with the coil to generate an oscillation signal; A frequency detection circuit for detecting a change in frequency of the oscillation signal; An envelope detection circuit for detecting a change in amplitude of the oscillation signal; Identification means for determining the identity of the metal body on the basis of the characteristic data, using the characteristic data of the inspection hardening as the characteristic data of the frequency signal output from the frequency detection circuit and the envelope detection signal output from the envelope detection circuit. Inspection device characterized in that. The inspection device according to claim 1, wherein the coil has two winding parts spaced apart from each other. An identification means according to claim 1 or 2, wherein the identification means for identifying the coin compares the feature data of the coin with the identification reference data for the plurality of species, and the identification reference data is free from the coin during the actual coin detection action. By providing the standard characteristic data for the plurality of gold species corrected by the period depending on the amplitude data of the oscillation signal generated in the oscillator oscillation in the can be determined gold species as identification reference data showing the best precision as the gold species of hardening Inspection device, characterized in that it can. The oscillation of claim 3, wherein the period of time is generated in the self-oscillating circuit in a state where there is no hardening during an actual hardening detection action on the amplitude data of the oscillation signal generated in the self-oscillating oscillator in the state of no hardening at a given reference point. A test device, characterized in that the ratio of the amplitude data of the signal. 5. The apparatus according to claim 4, further comprising: storage means for storing, as standard data, a ratio of at least one kind of standard feature data to amplitude data of an oscillation signal generated in the self-oscillating circuit in the absence of hardening at a given reference time point; The comparison characteristic data of the coin obtained when the coin passes through the winding part together with the standard data and the identification reference data, and the calculation of the amplitude data of the oscillation signal generated by the self-oscillator in the absence of the coin during the actual coin detection action. And a correction control means for obtaining identification reference data of the gold species, so that the gold species can be identified as identification reference data indicating the highest precision as the gold species of hardening in the gold species identification. 6. The storage apparatus according to claim 5, further comprising storage means for storing data representing a ratio of standard characteristic data of all target grades except for a specific grade to the standard characteristic data of the specific grade as standard identification coefficient data for each grade. The storage means is arranged to store a ratio of standard shape data of a specific kind to the amplitude data of the oscillation signal generated in the self-oscillator in the absence of hardening at a given reference time point as standard data, wherein the correction control means, The identification reference data of a specific gold species is obtained by the calculation of the amplitude data of the oscillation signal generated in the self-oscillating circuit in the state where there is no hardening by the standard data and the actual coin detection action, and the identification reference data of the specific gold species Identification of other types by true calculation of standard identification coefficient data Geomjeon wherein obtaining the data. 6. The method of claim 5, wherein the storage means stores the ratio of the standard feature data of all the grades to the amplitude data of the oscillation signal generated in the self-oscillator in the absence of hardening at a given reference time as the standard data of each grade. And the correction control means is identified reference data of each gold species by the calculated calculation of the amplitude data of the oscillation signal and the standard data of each gold species generated in the self-oscillator in the absence of any hardening during the actual coin detection action. Inspection device, characterized in that is adopted to obtain. The impedance and inductance of the coil according to claim 1, wherein the self-generating generator is influenced by the eddy current generated in the hardening by a magnetic field generated by the coil when hardening passes through the hollow part of the winding part of the coil. And a frequency detection circuit for detecting a change in frequency of the oscillation signal due to a change in the oscillation signal, and an envelope detection circuit for detecting a change in amplitude of the oscillation signal.