CN1314590A - Double detection coil metal probing method and device - Google Patents
Double detection coil metal probing method and device Download PDFInfo
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- CN1314590A CN1314590A CN 01112823 CN01112823A CN1314590A CN 1314590 A CN1314590 A CN 1314590A CN 01112823 CN01112823 CN 01112823 CN 01112823 A CN01112823 A CN 01112823A CN 1314590 A CN1314590 A CN 1314590A
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Abstract
The present invention relates to the detection of metal mixed in bulk material conveyed by belt conveyer. The double coil metal detecting method includes setting two, one front and one back, detecting coils to obtain two signals a and b of the detected metal; measuring the time t of metal to pass through the interval between the coils; and calculating in signal distinguishing and data processing circuit based on a, b and t to obtain results. The detection device includes a detection circuit with two detection coils, a signal distignuishing and data processing circuit and an output circuit.
Description
The present invention relates to transport the acquisition of signal method and apparatus that is mixed with metal object in the bulk material for belt conveyor.
Metal detecting device is to be used for detecting the metal object that the transportation processing materials is sneaked into, and it has wide range of applications.All transmit as the transported material in the blast furnace of metallurgy industry, sintering, raw material, and transported material all need carry out metal detecting device and detect before entering next procedure, as Fig. 4, shown in Figure 5 by belt conveyor.Existing metal detector adopts the electromagnetic oscillation formula, its principle is to detect eddy current loss, this metal detecting device is made of a magnetic test coil and a control device, the electron device of magnetic test coil and control device inside is formed a L (magnetic test coil) C (electron device of control device inside) oscillator, this oscillator is externally kept the continuous oscillation of certain amplitude under the constant situation of condition, when tested metal object is passed through magnetic test coil with certain speed, the iron loss of tested metal object causes eddy current loss, the Q value of oscillator is reduced, thereby the oscillating current of oscillator is increased.At this moment, oscillator will be kept oscillation power must just have the saltus step of a voltage like this to the oscillator supplementary power on the pull-up resistor of power supply, and this small voltage jump is exactly a metal signal through processing of circuit, sees Fig. 6.Metal detector in the course of the work, the working method of magnetic test coil is the magnetic field that detected material must pass magnetic test coil, so magnetic test coil can not conductively-closed, must expose in the working site, this extraneous factor that has determined the magnetic field of magnetic test coil to be subject in the environment influences, as: mechanical shock, on every side metal move, all multifactor magnetic test coil changes of magnetic field that causes such as the interference of extraneous strong-electromagnetic field and power supply quality, make metal detector produce misoperation, cause the belt conveyor operation off and on, had a strong impact on the continuity of producing.
The object of the present invention is to provide the device of a kind of double detection coil metal probing method and this method of enforcement.This method gives detected signal specific feature by two magnetic test coils are set, by output after the calculation process of detection signal there being the signal of metal.This device sensitivity height, anti-interference is good, adjusts easily, is applicable to detect to carry the metal object that mixes in the various materials.
The present invention is achieved in that
A kind of double detection coil metal probing method, it is magnetic test coil before and after on the belt of belt conveyor, being provided with two, detected metal successively is detected a, b signal during through two magnetic test coils and by two time t that magnetic test coil is required, a, b signal and time t are delivered to signal debate other places reason and data processing circuit computing, signal processing comprises the steps:
(1) beginning;
(2) initialization is preset by two time T, predetermined delay time T1 that magnetic test coil is required, timer zero clearing;
(3) whether differentiate reading of data, be, carry out next step, not, reenter (3);
(4) differentiation has not a signal, has, and timing begins, and carries out next step, not, reenters (4);
(5) whether differentiate t more than or equal to T, be, carry out next step, not, enter (8);
(6) differentiation has not b signal, has, and output has the iron signal, and carries out next step, not, enters (9)
(7) stop timing, the timer zero clearing enters (4);
(8) differentiation has not b signal, has, and enters (7), not, enters (5);
(9) whether differentiate t more than or equal to T+T1, be, enter (7), not, enter (6).
In the above-mentioned double detection coil metal probing method, the rising edge that described a, the number of winning the confidence of b signal trigger is as a, b signal.
A kind of device of implementing above-mentioned double detection coil metal probing method, the testing circuit of two magnetic test coils is connected in series oscillatory circuit, signal deteching circuit and signal pre-processing circuit by magnetic test coil, the signal sensitivity regulating circuit connects signal pre-processing circuit simultaneously, a, b signal pre-processing circuit also connect signal and debate other places reasons and data processing circuit, signal is debated other places reason and data processing circuit and is linked to each other with the characteristic memory circuit and carry out data read and comparison, and signal is debated other places reason and data processing circuit output and connect the output of detection signal output circuit metal signal is arranged.
In the above-mentioned double detection coil metal sniffer, described signal is debated other places reasons and data processing circuit and is connect the working mode selection circuit and carry out exchanges data, the working mode selection circuit connects the acquisition characteristics data processing circuit, acquisition characteristics data processing circuit deal with data is after the working mode selection circuit outputs to characteristic memory circuit stored, and the working mode selection circuit is accepted the signal controlling of working mode selection switch output.
The principle of work of double detection coil metal probing method of the present invention is: the detected time interval that crosses between iron signal and signal in two magnetic test coils is carried out computing, computing has the feature in the sequential and the time interval and judges according to being stored in detected signal in the storer, and predetermined delay time, delay time can rule of thumb be obtained with experiment, output has metal signal after computing, is used to indicate the tramp iron separator work supporting with metal detecting device.To obtain be the working mode selection switch to be chosen in characteristic gather shelves to the characteristic in the sequential and the time interval in the storer, to on belt conveyor, detecting with the test block of material with the certain speed motion, be stored in the characteristic data memory with the characteristic signal collection in the detected sequential of magnetic test coil and the time interval and after handling, so that when the working mode selection switch is chosen in the normal operating conditions shelves, read and compare.
The device of implementing double detection coil metal probing method is with reference to existing electromagnetic oscillation formula metal detector, the testing circuit of two groups of magnetic test coils is set, two groups of detection signal pre-process circuits also connect signal distinguishing and handle and data processing circuit, through this circuit with the characteristic memory circuit reads and relatively after output results to the detection signal output circuit and export metal signal is arranged.The acquisition characteristics data processing circuit links to each other with the characteristic memory circuit with signal distinguishing processing and data processing circuit through the working mode selection circuit, sequential that magnetic test coil detects and time interval characteristic signal are exported and are stored in the characteristic memory circuit by the acquisition characteristics data processing circuit after signal distinguishing processing and data processing circuit and the computing of acquisition characteristics data processing circuit.
The device of double detection coil metal probing method and this method of enforcement, overcome the influence of magnetic test coil changes of magnetic field that factors such as interference as mechanical shock, extraneous strong-electromagnetic field, power supply quality cause to two magnetic test coils, because these interference sources are to act on two magnetic test coils simultaneously, their feature is the same period, does not have temporal aspect and particular time interval feature.The mobile influence that causes the magnetic test coil changes of magnetic field of metal object around the double detection coil metal sniffer has also overcome simultaneously, because the migration of metal object is in certain magnetic test coil or act on two magnetic test coils simultaneously on every side, its signal does not have specific temporal aspect and time interval feature, therefore the double detection coil metal sniffer had not only had the detection sensitivity height, but also had had the good characteristics of anti-interference, and owing to adopt the electronic circuit processing signals, adjustment also is easier to.
Fig. 1 is signal processing flow figure in the double detection coil metal probing method of the present invention, Fig. 2 is a double detection coil metal sniffer circuit block diagram, Fig. 3 is the double detection coil scheme of installation, Fig. 4 is a magnetic test coil scheme of installation in the prior art, Fig. 5 is the side view of Fig. 4, and Fig. 6 is an electromagnetic oscillation formula metal detecting device circuit block diagram.
Provide embodiments of the invention below in conjunction with accompanying drawing.
Referring to Fig. 3, magnetic test coil A, the B of double detection coil metal sniffer installs by the direction front and back order that belt conveyor transports material, two magnetic test coil distance L, the belt conveyor travelling speed is V, then detected metal object is t=L/V through the time of magnetic test coil A, B, magnetic test coil A is detected, and to advance the iron signal be a, and detected to advance the iron signal be b to magnetic test coil B behind the elapsed time t.In order to carry out signal Processing accurately, the rising edge of only choosing signal when processing signals is as a, b signal, and the time interval of a, b signal rising edge is t.Referring to Fig. 2, the electromagnetic oscillation formula circuit that the testing circuit of magnetic test coil A, the B of double detection coil metal sniffer is the employing structure, parameter is identical.With magnetic test coil A is example, and promptly a input coil 1 is connected in series oscillatory circuit 2, a signal deteching circuit 3 and a signal pre-processing circuit 5, and a signal sensitivity regulating circuit 4 connects a signal pre-processing circuit 5 simultaneously; The testing circuit of magnetic test coil B is identical with magnetic test coil A.A signal pre-processing circuit 5 and b signal pre-processing circuit 10 are exported and are connect signal and debate other places reason and data processing circuit 13, signal is debated the other places reason and data processing circuit 13 connects working mode selection circuit 14, working mode selection circuit 14 connects working mode selection switch 16, this selector switch 16 has second gear, i.e. characteristic collection and normal the use.Selector switch 16 is selected in characteristic and gathers shelves, magnetic test coil A then, B detects and transport the metal coupons of sneaking in the material on belt conveyor, detection obtains the b signal that a signal and elapsed time t obtain, after signal is debated other places reason and data processing circuit 13 computings, output is input to acquisition characteristics data processing circuit 15 by working mode selection circuit 14, after 15 computings of acquisition characteristics data processing circuit, obtain test block through magnetic test coil A, the time T of B and setting delay time T1 are stored in T and T1 in the characteristic memory circuit 11 by working mode selection circuit 14 again.When working mode selection switch 16 places normal use shelves, then working mode selection circuit 14 output orders are debated other places reasons to signal and data processing circuit 13 detects by normal use, signal is debated other places reasons and data processing circuit 13 with magnetic test coil A, B detects a that obtains, b signal and a, the time interval t of b signal and the characteristic T that is stored in the characteristic memory circuit 11, T+T1 relatively, output results to detection signal output circuit 12 after the computing through constantly reading and comparing, the signal 17 that metal arranged by detection signal output circuit 12 output to the supporting deironing apparatus of double detection coil metal sniffer on.
Claims (4)
1. double detection coil metal probing method, magnetic test coil before and after it is characterized in that on the belt of belt conveyor, being provided with two, detected metal successively is detected a, b signal during through two magnetic test coils and by two time t that magnetic test coil is required, a, b signal and time t are delivered to signal debate other places reason and data processing circuit computing, signal processing comprises the steps:
(1) beginning;
(2) initialization is preset by two time T, predetermined delay time T1 that magnetic test coil is required, timer zero clearing;
(3) whether differentiate reading of data, be, carry out next step, not, reenter (3);
(4) differentiation has not a signal, has, and timing begins, and carries out next step, not, reenters (4);
(5) whether differentiate t more than or equal to T, be, carry out next step, not, enter (8);
(6) differentiation has not b signal, has, and output has the iron signal, and carries out next step, not, enters (9)
(7) stop timing, the timer zero clearing enters (4);
(8) differentiation has not b signal, has, and enters (7), not, enters (5);
(9) whether differentiate t more than or equal to T+T1, be, enter (7), not, enter (6).
2. double detection coil metal probing method according to claim 1, the rising edge that it is characterized in that a, the b signal number of winning the confidence triggering is as a, b signal.
3. device of implementing the described double detection coil metal probing method of claim 1, it is characterized in that two magnetic test coil (A, B) testing circuit is by magnetic test coil (1,6) serial connection oscillatory circuit (2,7), signal deteching circuit (3,8) and signal pre-processing circuit (5,10), signal sensitivity regulating circuit (4,9) connect signal pre-processing circuit (5 simultaneously, 10), a, b signal pre-processing circuit (5,10) and connect signal and debate other places reasons and data processing circuit (13), signal is debated other places reasons and data processing circuit (13) and is linked to each other with characteristic memory circuit (11) and carry out data read and comparison, and signal is debated other places reason and data processing circuit (13) and exported and connect detection signal output circuit (12) and export metal signal (17) is arranged.
4. double detection coil metal sniffer according to claim 3, it is characterized in that signal debates other places reasons and data processing circuit (13) and connect working mode selection circuit (14) and carry out exchanges data, working mode selection circuit (14) connects image data characteristic processing circuit (15), image data characteristic processing circuit (15) deal with data is after working mode selection circuit (14) outputs to characteristic memory circuit (11) stored, and working mode selection circuit (14) receives the signal controlling of working mode selection switch (16) output.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB011128232A CN1166945C (en) | 2001-04-30 | 2001-04-30 | Double detection coil metal probing method and device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB011128232A CN1166945C (en) | 2001-04-30 | 2001-04-30 | Double detection coil metal probing method and device |
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| CN1314590A true CN1314590A (en) | 2001-09-26 |
| CN1166945C CN1166945C (en) | 2004-09-15 |
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| CNB011128232A Expired - Fee Related CN1166945C (en) | 2001-04-30 | 2001-04-30 | Double detection coil metal probing method and device |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102673981A (en) * | 2011-03-16 | 2012-09-19 | 宝山钢铁股份有限公司 | Conveyor belt metal access control system |
| CN105572750A (en) * | 2015-12-28 | 2016-05-11 | 深圳市澳亚迪电子设备有限公司 | Self-balance noise reduction metal detection double-coil |
| CN105866176A (en) * | 2016-03-25 | 2016-08-17 | 东莞市华盾电子科技有限公司 | Calibration method, test method and system of metal classified detection |
| CN107329176A (en) * | 2017-07-18 | 2017-11-07 | 应城市恒天药业包装有限公司 | A kind of pipeline metal detection device |
| CN108722903A (en) * | 2018-04-23 | 2018-11-02 | 周志明 | A kind of metal detection separator and method based on rubber conveyer |
| WO2023030241A1 (en) * | 2021-09-02 | 2023-03-09 | 青岛海尔洗涤电器有限公司 | Clothing treatment device and control method therefor |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101988971B (en) * | 2009-08-05 | 2013-04-10 | 沈阳隆基电磁科技股份有限公司 | Metal detector for belt conveyer |
| CN102121998B (en) * | 2010-01-08 | 2013-06-19 | 宝山钢铁股份有限公司 | Metal detection method for steel wire core conveyor belt |
-
2001
- 2001-04-30 CN CNB011128232A patent/CN1166945C/en not_active Expired - Fee Related
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102673981A (en) * | 2011-03-16 | 2012-09-19 | 宝山钢铁股份有限公司 | Conveyor belt metal access control system |
| CN105572750A (en) * | 2015-12-28 | 2016-05-11 | 深圳市澳亚迪电子设备有限公司 | Self-balance noise reduction metal detection double-coil |
| CN105866176A (en) * | 2016-03-25 | 2016-08-17 | 东莞市华盾电子科技有限公司 | Calibration method, test method and system of metal classified detection |
| WO2017162107A1 (en) * | 2016-03-25 | 2017-09-28 | 东莞市华盾电子科技有限公司 | Discrimination method and test method for detection of metal classification and system thereof |
| CN107329176A (en) * | 2017-07-18 | 2017-11-07 | 应城市恒天药业包装有限公司 | A kind of pipeline metal detection device |
| CN108722903A (en) * | 2018-04-23 | 2018-11-02 | 周志明 | A kind of metal detection separator and method based on rubber conveyer |
| CN108722903B (en) * | 2018-04-23 | 2024-01-12 | 周志明 | Metal detection and separation device and method based on rubber belt conveyor |
| WO2023030241A1 (en) * | 2021-09-02 | 2023-03-09 | 青岛海尔洗涤电器有限公司 | Clothing treatment device and control method therefor |
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|---|---|
| CN1166945C (en) | 2004-09-15 |
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Granted publication date: 20040915 Termination date: 20160430 |