JPS5943349A - Metal piece selector - Google Patents

Abstract

PURPOSE:To identify the composition of a sample metal piece by removing components attributable to errors in the outer diameter dimensions thereof, deviation in the setting position and the like. CONSTITUTION:A sample piece is set on one of sensors 1 and 1' each equipped with a drive coil and a detection coil and a reference piece on the other thereof. The drive coils are driven with an AC source 3 and outputs of the detection coils are applied to a detector 7 through a differential amplifier 4. Then, the detector 7 fetches a signal at the phase position designated by two reference phase signals formed with a phase signal generator 6 from a differential signal from the amplifier 4. On receiving the signal, a phase shifter 9 re-evaluate it on the coordinate rotated in the shift according to the preset value of a phase setting device 10. This removes components attributable to errors in the outer diameter dimensions of the sample piece, deviation in the setting position and the like thereby enabling identification in the composition of a sample metal piece.

Description

[Detailed Description of the Invention] Kikomei uses the whirlpool Ichiryu - (Shirjl gold 6B o (
This section relates to a metal piece sorting device 11 that sorts metal pieces.

Conventionally, as an example of a device for separating sample metals using eddy current, an example is shown in Figure 1. 1) ti JM Width 'A'A 'N
:) Coils C1, C21τIJ- for each Q, -',
+(N
l:]'s output Akira (child (13 and human power 1) son-in-law (・= connection is 11℃. This) to C1 amplification (/\M F)
[For human power] Ir C1 and C2 output No. 111 unrestricted Mi
The minute is positive; h! , :5, and the entire C differential oscillates; the slide is 34+': completed.

The differential oscillator constructed in this way is
If the outputs of the two are equal, they cancel each other out, so no signal is given to the input terminal of the amplifier AMP, and no oscillation occurs. However, if there is a difference in the outputs of the two, the difference Since it is amplified by the amplifier ΔN11 and given a positive feedback, oscillation begins. Here cl 4ffl tl to one coil C1
a The sample metal piece is sen 1~, and the other = 1 il C2
When the sample metal J1 to be sorted is separated from the sample metal J1, a unique eddy current flows through each sample metal piece depending on the metal composition, external shape, etc. of the sample metal piece. Therefore, if the two test pieces are the same, the eddy current flowing in both will be 4 Lakh, and there will be no difference in the outputs of coils C1 and C2, and the device will not oscillate, but 2 If there are differences in the metal composition, external dimensions, etc. of the two sample metal pieces, the way the eddy current flows will change, causing the coil c i
, c2, and this difference causes the fitting to start oscillating. In other words, when the device oscillates, both “(
There is a difference between W1 and metal C, and if they do not oscillate, it can be recognized that they are the same.

However, (two children 4'i: 1;'K J'I-
・C(yo, difference 1(Ilshi3 'l'l?
The feeling of +'::4 Qj 'j:l 怀2 or I seems to be extreme, for example (,[,99,9% gold 3412 and 99,09',
6 of 6 13; λ Which sorting etc. @ genus (1・CIQ judgment unit: ζ 1 stave' 2 sorting device j 3 j 7) cannot be applied, and the external shape of sample stage 1 iris j 1 Errors or imperfections caused by internal (Fl, surface condition f ratio, etc.) of the sample metal piece, etc. A vertical sample metal piece C゛6 is 4) to f, differential oscillation j!i f,,"r oscillates (5 te I), 1, annoying t) i!F) It was.

Book 95 Proposal 1J Focusing on these points, 4 "1) -
C1 Trial O': 1 Subtle vortex 7E flow that forms on a piece of metal [(
θ-ization',? +:'? ：I know, try it from among them''] 1 Misuse of the external shape of the piece:, or 4, d prisoner due to misalignment when bringing it close to the Senri or when illuminating the matchmaker (jstr-). Suishi complaint (removes 51 ingredients,
Simply extract only the components of metal composition ()0, J, and F, and use a metal piece sorter Fi to sort out the same. The gist of (and the gist of (a) and (b) is that the two coils are electromagnetically coupled.) The two coils are connected to the drive element 1 and the detection coil, and are created by a metal piece placed near them. At least two sensors 1) for reading changes in electromagnetic coupling between the sensors 1), an AC signal source for exciting and driving each sensor 1, and 2 sensors having a predetermined phase difference from this drive signal. three phases j, t N,
A phase base 11 (signal generator) that generates a signal; a differential amplifier that receives the detection signal of the detection coil from two of the sensors and outputs the difference signal; A detector for extracting a signal at a phase position designated by the phase reference signal, and a phase shifter for rotating the phase of this detection output according to a preset value and evaluating the rotated coordinates. The present invention relates to a metal piece sorting device.Hereinafter, it will be described in detail according to an embodiment shown in the drawings.

Figure 2 shows 7 grams of block-dyed hair showing an embodiment of the present invention. .

In the figure, '1' and '1' represent a pair of sensors, and as shown in detail in FIGS. 3 and 4, a drive coil 1a is wound concentrically. and detection=”
-Ile'11) and ((jlE-C.Sample piece 2
is inside this detection coil 11)? J′! There are people in the department [! For example, in the detection coil 11) of the sensor 1, there is a sample sample 1 to be sorted.
-, and in the detection coil Ib of Ken→No1- (vote!
((The sample metal piece 2 becomes 1 = 1 -.

3 is an alternating current signal source for supplying the driving signal 14'; Because the eddy current generated by c1 is affected by the shadow IA due to the condition of the internal bolts and surface of the
50t-1z-500Hz culm" [supplies high-frequency sine wave alternating current signals with constant current or constant voltage].

4 is the detection of the pair of Lonza 1 and 1-.
Receive the detection signal outputted by () and take the difference,
For example, Eva 10000 (f:i culm 1.ff: 0'
) There is a differential amplifier C with amplification −t”r amplification. !=5 is the harmonic included in the output signal of this differential amplifier 4; 1, v
components are removed, and only the frequency components of the drive signal sent by the AC signal source 3 are passed through! This is a low-pass filter that creates a difference tD.

6 is the predetermined () "11" from the above-mentioned message received from the previous communication source 33 and the same message from the communication source 33.
Phase amount 111 with 11 difference! The position where the signal is created
1 signal generation book.

This phase 1j 1. The p signal is, for example, the drive i! The phase angle of the lII signal is λI1. This signal has a phase difference of π7/25 dian. 7 uses this phase-side 4 quasi-signal to convert the differential signal transferred from the low-frequency (low-frequency) r-shita 5 to '4V.
In other words, it is a detector that generates signals χ and y corresponding to the phase position of the phase J11 signal. For example, the phase position specified by the phase base Ii signal, that is, the phase position I of the drive signal at a phase angle of 0 radian J3 and 7c/2 radian.
i2? The second width (lα) of the differential signal of t' is detected and sent as the signal χ or (i-y).

8 is electrical circuit system L O++ F! Due to the drift of semiconductor components, variations in component values, etc., the same sample metal J'l is accurately placed on the lenses 1 and 1'. 1- Even if it is done, ()(■
When the signal χl13 and the signal y output by the wave splitter 7 are "0"
"There is a car that does not have 4'c. This white [Rebalance J314 analogy, [4V? jl'J adjustment is possible, and J- is made in one device. Kodaira v11 of the above-mentioned electrical circuit system (the signals χd3 and y that did not become ``0'' were amplified by 1 IC;): (published by i'
'? Make adjustments and automatically cancel 6 lines, this is J.
63 and)' outputted as "O" becomes (
initialized to default.

9 is the metal part according to this Bonmei.
10 is a phase setter which sets the rotational phase l1lj to Pth so that Jj<phase. Now, based on the aforementioned signals
] 1 to 2 Results of the experiment: ■ When a sample metal piece 2 of the same shape is accurately positioned 4 times and placed in the sensor 1 at the bottom 1, and its metal composition is changed,
Its old side value is indicated by △ in Figure 5. 8+'”; cS1 quadrant A
3J: Immediately passing through the third quadrant: ii l' iIj similar.

■ Since the magnetic flux density inside the metal piece 2 is not uniform, the error in the external dimensions of the sample metal piece 2 and the unreli'1 Henoshi・
[of the printing position], and its measurement 1.
f(f can be approximated by a straight line passing through the second and fourth quadrants shown in [( in FIG. 5).

■ These) Lτ-like rXKA /\ and Snake are the original locus 49 axes) <.

The Y 41'1j' angle 0 varies depending on the shape of the drive signal y(j wave number 1.1').

He praised the facts such as:

Therefore, by conducting experiments under predetermined conditions in advance, data corresponding to the angle θ between the approximate straight line and the coordinate axes was obtained by
3, the signal RX 1 is output from the detector 8.

Y! If the measurement point C determined by is re-decorated on the coordinates rotated by the angle θ of E), the external dimensions and retting position will be:! % to remove the component caused by the difference in I and C. The phase setter 10 is used to set the coordinate axes to the MF approximate straight line based on preliminary experiments;
The phase shifter 9 coordinates ii1! according to the rotational phase 1 set in advance in the phase jl determiner 10! l is rotationally transformed, and the measured value is evaluated on this transformed outer building as T (iif+), [Ill et al., the distance 11 from the approximate straight line B is The method is to output a sorting signal corresponding to the Kimihiro Aisei outfit of 1 metal piece 2.

11 is a reference signal generator, and 12 is a comparison circuit that compares the signal generator 11's output tt with the output of the phase shifter 9 (semi-signal) and selection No. 13. Yes.As a result of the comparison, for example,)Babetsu':'47'J+L,%
If it is smaller than Qt+++, it is determined that the 11 metals are the same, and if it is thicker, it is determined that they are different, and a determination signal based on this determination result is output. 13 is a display drive circuit; , the lamp L1 or L2 of the display 14 is driven to turn on in response to the judgment signal g from the comparison circuit 12.

Next, the procedure for sorting metal pieces using the metal piece sorting equipment prepared in this way will be explained.

J: Is it a selective work? °1 (preceding -C1 metal piece) Initial 3-pot determination of Pa separate Oka is performed. To this (3″1. First,
Place the test t'1 metal pieces 2 of the same shape and composition in the 2' hinges 1J'3 and 1' at the setting position 1-1.
'I play Sera 1- with all my heart. Here, even if both sensors 1 J3 and 1' are driven by the intercurrent signal source 3, the output of the differential amplifier/1 becomes 1101+ because the detection signals of both sensors 1 and 1' cancel each other out. Therefore, the detector 7
The outputs n, χ, y are also inherently ``OII''. However, due to semiconductor 1: lift, component value shortcuts, etc., II O11 is not always possible! '? <
>Yes.

(・At η, the output signal 6 of
Perform the 110++ sub-adjustment of the electrical system of the device so that it becomes 1. Next, a preliminary experiment is conducted to find an approximate straight line under a predetermined stripe '1, and the angle between this approximate straight line and the coordinate thi1 is set in advance as the rotational phase amount in the phase setting device 'IO. For this preliminary experiment, experiment 4; l;, change the lens used, etc.) Z graduate A' That line a'1
If the values S and I (=J) are stored in the phase setter 10, there is no need to perform a preliminary experiment each time the conditions change to determine the rotational phase.

In this way, one sensor 1 of the metal piece sorting device, which has been set for the first time, receives the test stone Kinyaku J''i2, which will be sorted from now on, and the other sensor 1' Mark I

Here, the AC signal source 3 is operated l! , the drive signal is sent to the sensor 183.
,') Then, the magnetic flux produced by the moving coil 1a is applied to the detection coil 11, and a detection signal of 1J is induced therein. This detection signal! (J, detection coil 11)
1 method, Ref 1-position + r10) Depending on the error, etc., the above-mentioned magnetic flux -) T'rK 11 plan L'7. I'+
2 Inside i: The eddy current of the cow is slightly different.

The differential amplifier 4 connects these two
The difference between the detection signals of 10000 and 10000 (amplified to 1'1 and the harmonic components removed by the low-pass filter 5) is created, and the difference signal is sent to the detector 7. &'
1iii 7 i. i.

Phase signal generator 6 emits 1t-y, two phase 17 ports 1' with a phase difference of 7r/2 radians = (corresponding to A bow)
h L, r.

It outputs signals χ and y corresponding to the value of the difference signal at each phase angle. The output of the detector 7 is converted into signals iX and Y by an automatic balancer 8 and sent to a phase shifter 9.

Here, if the composition of the sample metal piece 2 soldered to the two sensors 1 and 1' is the same τ, the values of the signals Tsu1~! 1. Since this is only due to the error in the external dimensions, the measurement point ti
It rides on the t approximation straight line B, and the J component shown by the arrow is 11011
becomes. Therefore, the phase shifter 9 sets the coordinate axis to the phase setter 1.
The color changes (rotation change) according to the rotational phase set to 0, and when the above measurement point is revised on the coordinate K (!), its component in the X-axis direction becomes 11011. If there is a difference, re-revise 11 on this rotationally transformed coordinate axis.
i1i Shit measurement (10 x 1Iib direction component is II
OII is -f, metal; there is a value according to the difference in the 41 composition (it is '3.) to have IC1. l\
I'm sending it out.

In the comparator circuit 12, the sent selection signal is converted into a reference signal and a far-off beam based on the light 4 of the 13 1'1. Perform the same determination as i, -=, u. That is,) Pa-by-1n No. 110! 1 (3I: Same, if it has the value, it is judged as '! Which comparison is made (j is not present, if it is smaller than 7, 7 value is 85, it is determined that l1iJ-4rl is formed, if it is larger than 1N, it is determined that the composition is different, and the judgment signal corresponding to this judgment result 9 is sent to the display drive circuit 13. If this determination signal indicates the same 7tl composition, the display drive circuit 13 drives, for example, the lamp L1 of the display 111 to light it, and displays the signal 81b), f, for example, the lamp L2, indicating a different composition. 4i: U.

Although the description has been made regarding the riiT wound on the nozzle according to the illustrated embodiment, it goes without saying that the present invention is not limited thereto.

For example, the number of sensors is not limited to 21111, but 13, 9, and 21 sensors can be used to accommodate the shape of the metal piece. 1!,
” (You may use switching. In this jf5 case, each sensor fu
It is necessary to perform one experiment in advance to obtain an approximate straight line and set the amount of rotational phase in the phase setting E3.

4jT: It is possible to separately cover a sample metal piece of 1~4Y with a ceramic plate 1 to 1, which is marked on one of the pair of sensors used. That is, an appropriate sample metal piece is set on one side, a standard sample metal piece is placed on the other side, and the initial setting of the sorting system is performed using Cera 1 to 1.
After that, if you change the standard 81 (fee bottom piece) to the i71! sorting sample metal piece, it becomes possible to sort out the difference in composition between the sample metal j-1 to be measured and the standard sample metal piece. In this case, the comparison circuit The judgment is not a comparison with "o", but a comparison with a certain predetermined value (11■), and a range is set for this value taking measurement errors etc. into account, and whether or not it falls within that range is used to determine the difference in metal composition. Extending this further, even if one sensor is in the J3 state, it is possible to distinguish between different metal compositions in exactly the same way. If the comparison circuit is improved, it will be possible to select a large number of metal compositions step by step.

Furthermore, the 4iG structure of the sensor' is not limited to that of the embodiment, but may be one in which the drive coil and the detection coil are stacked, and the sample metal piece is not inserted into the detection coil. It is sufficient that the magnetic flux generated by the drive coil, such as one placed on a sensor, can effectively pass through one piece of the sample four times. In addition, with a blank core coil (not only those with a tampered core, but also E-type, pot-shaped, etc.), drive 21
With 4 windings of the irradiation detection coil, it is also possible to move the sample metal piece to the part of the bottleneck (-) in an efficient manner.

In addition, the frequency of the drive signal generated by the AC signal source is set at 50°C to prevent the skin effect and the effect on the flow of eddy currents due to [-(l~5
001-1 At a low frequency of about z, a large eddy current is made to flow throughout the sample metal (1), but if the conditions such as the size of the sample metal piece are different, it may be possible to use a higher frequency. 6 nights in L.

As explained in detail above, according to the metal sorting device of the present invention, it is possible to completely eliminate the effects of errors in the external shape Xi method, deviations in the let position, etc., and to judge only 74 pieces of metal composition as gauze frames. Therefore, for example, jQ ffi is strictly managed, but Y1 type ) ＼ (useful 4) - yell.

[Brief explanation of the drawing]

Fig. 1 is a block diagram showing an example of a conventional metal piece sorting device, Fig. 2 is a block diagram showing an embodiment of the present invention, and Figs. 3 and 4 are used for this purpose.
A plan view and a sectional view showing an example of the sensor, and FIG. 5 are diagrams for explaining the present invention in detail. 1.1'...Sensor, 1a...Drive coil, 111...Detection coil, 2...
・Sample fee: 5 pieces, 2... Exchange letter: 8 sources, 4...
... Differential amplifier, 5 ... Low-pass filter, 6.
... Phase signal @ generator, 7 ... Detector,
8... Automatic balancer, 9... Phase shifter, 10... Phase setter, 11...
・1; (quasi-shintan generator, 12...comparison circuit, 1
3...display drive circuit, 14...display. Patent applicant: IYI Nakanei Metal Engineering Co., Ltd., Hara Denshi Sokki Co., Ltd. Figure 3 Figure 4 Figure 5

Claims (2)

[Claims] (1) At least two sensors having a drive coil and a detection coil that are electromagnetically coupled and reading changes in the electromagnetic coupling between the two coils caused by a sample metal piece being hit by a force in the vicinity of each other. ), an alternating current signal source for exciting and driving the drive coil of each sensor, and a phase signal generator that generates a signal from two phase bases t(1) and (11) for generating a predetermined phase difference from this drive signal. A differential amplifier receives the detection signal of the detector coil from two of the sensors and outputs the difference signal; A metal piece sorting device comprising a take out! . (2) The metal piece sorting device according to claim (1), wherein the frequency of the drive signal generated by the AC signal source is set to a low frequency of 50t-1z to 500Hz. (J Sensor drive coil and detection =) The coils are arranged in a concentric circle, and one specimen claw piece is placed in the center of the coil, and each sample metal is The piece is placed in the microwave and placed in the other microwave. !
A waiting period characterized by the fact that the first metal piece of the sorting test is let.
The range (1) or (2) of i'F iil ~
The metal piece sorter fNY described in Section 1.