CN102096110A - Metal detecting device suitable for belt conveying mechanism - Google Patents
Metal detecting device suitable for belt conveying mechanism Download PDFInfo
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- CN102096110A CN102096110A CN2010105514696A CN201010551469A CN102096110A CN 102096110 A CN102096110 A CN 102096110A CN 2010105514696 A CN2010105514696 A CN 2010105514696A CN 201010551469 A CN201010551469 A CN 201010551469A CN 102096110 A CN102096110 A CN 102096110A
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Abstract
The invention discloses a metal detecting device, in particular to a metal detecting device suitable for a belt conveying mechanism. The metal detecting device comprises an oscillating circuit, a pulse amplifying circuit, a first comparison circuit, a second comparison circuit, a bistable circuit and an alarm driving circuit, wherein the oscillating circuit comprises double Colpitts oscillating circuits, one output end of the oscillating circuit is connected with the input end of the pulse amplifying circuit, the output end of the pulse amplifying circuit is connected with the input end of the first comparison circuit, the output end of the first comparison circuit is connected with the input end of the bistable circuit, the output end of the bistable circuit is connected with the alarm driving circuit, the input end of the second comparison circuit is connected with the other output end of the oscillating circuit, and the output end of the second comparison circuit is connected with the alarm driving circuit. The can be used for detecting metal in real time without sending alarm information at the combined part of a conveying belt; metal detection is realized by using a hardware circuit; and the metal detecting device has the characteristics of simple structure, good stability, low cost and high efficiency.
Description
Technical field
The present invention relates to a kind of metal detecting device, particularly a kind of metal detecting device that is applicable to belt transmission agency.
Background technology
In industry such as generating, food processing, production of fodder, before material enters comminutor by the belt transmission, need be with metal removals such as iron, copper, aluminium, otherwise will cause fatal destruction to comminutor, usually adopt tramp iron separator to remove metal automatically with magnetic, as iron, these do not have the metal of magnetic and for aluminium, copper etc., tramp iron separator just can't be removed, this just needs a kind of metal detecting device, send warning message when on detecting travelling belt, metal being arranged, but do not send warning message in the joint portion of travelling belt.
Summary of the invention
The purpose of this invention is to provide a kind of metal detecting device that is suitable for belt transmission agency, that this device has is simple in structure, good stability, low, the efficient advantages of higher of cost.
The present invention adopts following technical scheme for achieving the above object:
The present invention is a kind of metal detecting device that is suitable for belt transmission agency, its theory diagram such as Fig. 1 comprise oscillatory circuit (1), pulse amplifying circuit (2), first comparator circuit (3), second comparator circuit (6), bistable circuit (4), warning driving circuit (5).An output terminal of described oscillatory circuit (1) connects the input end of pulse amplifying circuit (2), the output terminal of pulse amplifying circuit (2) connects the input end of first comparator circuit (3), the output terminal of described first comparator circuit (3) connects the input end of bistable circuit (4), the output terminal of described bistable circuit (4) connects warning driving circuit (5), the input end of described second comparator circuit (6) connects another output terminal of oscillatory circuit (1), and the output terminal of second comparator circuit (6) connects the warning driving circuit.Described oscillatory circuit is made up of two Kao Bizi oscillatory circuits, and an output terminal of two Kao Bizi oscillatory circuits is connected between second inductance (L2), the 3rd inductance (L3), and another output terminal is connected between first inductance (L1) and the electric capacity (C2); The mode that described pulse amplifying circuit (2) adopts inverse proportion to amplify is made of integrated operational amplifier (U1B), partiting dc capacitor (C10), input resistance (R4), feedback resistance (R6), output filter resistance electric capacity (R7, C12), balance resistance (R5), discharge capacity (C11); Described first comparator circuit (3) is made up of an integrated operational amplifier and resistance on every side thereof, described bistable circuit (4) but form by resistance, the electric capacity of the trigger flip-flop of a repeated trigger and decision time constant, described warning driving circuit (5) but form by the trigger flip-flop and the amplifying circuit of a repeated trigger, described second comparator circuit (6) is made of a voltage follower circuit and a voltage comparator.
The invention is characterized in: adopt an oscillatory circuit to seek metal,, determine that whether metal exists by detecting the variation of output voltage size.
Beneficial effect of the present invention is:
1. can detect in real time metal, and not send warning message in the joint portion of travelling belt.
2. realize metal detection with hardware circuit, simple in structure, good stability, cost is low, efficient is high.
Description of drawings
Fig. 1 is that principle of the present invention connects block diagram;
Fig. 2 is the oscillatory circuit schematic diagram;
Fig. 3 is the output waveform figure of oscillatory circuit;
Fig. 4 is the pulse amplifying circuit schematic diagram;
Fig. 5 is the schematic diagram of first comparator circuit;
Fig. 6 is the bistable circuit schematic diagram;
Fig. 7 is a warning driving circuit schematic diagram;
Fig. 8 is the schematic diagram of second comparator circuit.
Embodiment
Be elaborated below in conjunction with the technical scheme of accompanying drawing to invention:
Fig. 1 is principle connection side's block diagram of the present invention.Oscillatory circuit 1 connects the input end of pulse amplifying circuit 2, the output terminal of pulse amplifying circuit 2 connects the input end of first comparator circuit 3, the output terminal of described first comparator circuit 3 connects the input end of bistable circuit 4, the output terminal of described bistable circuit 4 connects warning driving circuit 5, the input end of described second comparator circuit 6 connects another output terminal of oscillatory circuit 1, and the output terminal of second comparator circuit 6 connects warning driving circuit 5.Oscillatory circuit 1 is made up of two oscillatory circuits of examining now as shown in Figure 2, and output C and output D are arranged, and output C is connected between L2, the L3, and shown L1 is a magnetic test coil, and L1 detects metal as sensor and whether exists, exports D and is connected between L1 and the capacitor C 2.
The output C of oscillatory circuit 1 receives pulse amplifying circuit 2, and what normality was exported is a zero level, will occur a negative voltage pulse when having detected metal, becomes the voltage pulsewidth of a forward through pulse amplifying circuit 2.First comparator circuit 3 compares voltage and the setting value that collects, and generates to trigger control signal, triggers control signal and control warning driving circuit 5 behind bistable circuit 4.The output D of oscillatory circuit 1 receives second comparator circuit 6, the sine wave of the standard of exporting under the normality, and its amplitude changes and is not obvious when on the travelling belt metal being arranged, and when the travelling belt joint portion was passed through, the amplitude of waveform had significantly and reduces.This significant change generates a negative voltage pulsewidth behind second comparator circuit 6, the clear terminal of the driving circuit 5 that receives the report for police service, driving circuit 5 work of forbidding reporting to the police.
Figure 3 shows that the output C of oscillatory circuit 1, the waveform of output D, its output waveform is respectively the sine wave 19 of zero level 17 and standard under normal conditions.When detecting metal, the output C of oscillatory circuit 1 will export a negative voltage pulse 18, when the joint portion of travelling belt through out-of-date, the output D of oscillatory circuit 1 can export a sine wave 20 that reduces than standard sine wave 19 amplitudes.
Figure 4 shows that the pulse amplifying circuit 2 among Fig. 1.Negative voltage pulse 18 among Fig. 3, the input end that is added to pulse amplifying circuit 2 carries out inverse proportion and amplifies after capacitor C 10 excludes direct current, and shown R6, R4 play amplification, and R7, C12 play filter action.
Figure 5 shows that first comparator circuit 3, its output 10 is high level under the normality, when input 9 input high levels, then export a zero level, produced a negative edge, be added to the input 11 of bistable circuit shown in Figure 64, then export the high level that 12 meetings produce certain pulsewidth, shown bistable circuit 4 is made up of a trigger U2A and resistance, electric capacity, and its time constant is determined by R12, C13.Export 12 and can change back to zero level by high level, produced a negative edge, be added to input a shown in Figure 7, high level of trigger U2B output is through 1 action of amplifying circuit rear drive relay K.
Figure 8 shows that second comparator circuit 6, when metal detector is passed through in the joint portion of moving belt, the output waveform of oscillatory circuit 1 becomes the less sinusoidal waveform of amplitude 20 by standard sine waveform 19 shown in Figure 3, be added to the input 15 of second comparator circuit 6, this signal is isolated through voltage follower U1C, compare with reference voltage after the diode D1 half-wave rectification, shown resistance R 15, capacitor C 14 play the effect that reduces ripple.When the waveform of input became the less sine wave 20 of amplitude by standard sine wave 19, the waveform of output 16 just had a negative edge from high level vanishing level, is added to the input b of warning driving circuit 5, forbade that trigger U2B triggers, and made it keep zero level.When the process detector of the joint portion of moving belt, though the input a of warning driving circuit 5 has negative edge to arrive, but importing b this moment has had negative edge to arrive to have forbidden flip-flop operation, bistable circuit 4 shown in Figure 6, play the effect of the decline time-delay arrival that makes input a, so just realized when the process detector of travelling belt joint portion, not sending the function of warning.
Claims (7)
1. metal detecting device that is applicable to belt transmission agency, it is characterized in that: comprise oscillatory circuit (1), pulse amplifying circuit (2), first comparator circuit (3), bistable circuit (4), second comparator circuit (6), warning driving circuit (5), an output terminal of described oscillatory circuit (1) connects the input end of pulse amplifying circuit (2), the output terminal of pulse amplifying circuit (2) connects first comparator circuit (3) input end, described first comparator circuit (3) output terminal connects bistable circuit (4) input end, described bistable circuit (4) output terminal connects warning driving circuit (5), the input end of described second comparator circuit (6) connects another output terminal of oscillatory circuit (1), the output terminal of second comparator circuit connects the warning driving circuit, and above-mentioned oscillatory circuit is made up of two Kao Bizi oscillatory circuits.
2. metal detecting device according to claim 1, it is characterized in that: the mode that described pulse amplifying circuit (2) adopts inverse proportion to amplify is made of integrated operational amplifier (U1B), partiting dc capacitor (C10), input resistance (R4), feedback resistance (R6), output filter resistance electric capacity (R7, C12), balance resistance (R5), discharge capacity (C11).
3. metal detecting device according to claim 1 is characterized in that: described first comparator circuit (3) is made up of an integrated operational amplifier (U1A) and resistance on every side thereof.
4. metal detecting device according to claim 1 is characterized in that: described bistable circuit (4) but form by resistance (ER12), the electric capacity (C13) of the trigger flip-flop (U2A) of a repeated trigger and decision time constant.
5. metal detecting device according to claim 1 is characterized in that: described warning driving circuit (5) but form by the trigger flip-flop (U2B) and the amplifying circuit of a repeated trigger.
6. metal detecting device according to claim 1 is characterized in that: described second comparator circuit (6) is made of a voltage follower circuit and a voltage comparator.
7. metal detecting device according to claim 1, it is characterized in that: an output terminal of two Kao Bizi oscillatory circuits is connected between second inductance (L2), the 3rd inductance (L3), and another output terminal is connected between first inductance (L1) and the electric capacity (C2).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010105514696A CN102096110A (en) | 2010-11-19 | 2010-11-19 | Metal detecting device suitable for belt conveying mechanism |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010105514696A CN102096110A (en) | 2010-11-19 | 2010-11-19 | Metal detecting device suitable for belt conveying mechanism |
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| Publication Number | Publication Date |
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| CN102096110A true CN102096110A (en) | 2011-06-15 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2010105514696A Pending CN102096110A (en) | 2010-11-19 | 2010-11-19 | Metal detecting device suitable for belt conveying mechanism |
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| CN (1) | CN102096110A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103245975A (en) * | 2012-02-08 | 2013-08-14 | 淮南矿业(集团)有限责任公司 | Conveyor belt metal coupling head detection device and metal foreign substance detection system |
| CN106910280A (en) * | 2017-02-04 | 2017-06-30 | 深圳怡化电脑股份有限公司 | The pre- reading circuit of chip card and finance self-help traction equipment |
| CN108710154A (en) * | 2018-06-27 | 2018-10-26 | 安徽金安矿业有限公司 | A kind of combined metal detection method and device |
| CN112147703A (en) * | 2020-09-25 | 2020-12-29 | 湖北理工学院 | Metal detector |
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| CN2225684Y (en) * | 1995-03-31 | 1996-04-24 | 广东工学院 | Metal dectecting instrument |
| JPH11337658A (en) * | 1998-05-22 | 1999-12-10 | Shinichi Nishimoto | Device for detecting metal object |
| CN2371566Y (en) * | 1999-05-26 | 2000-03-29 | 王祥驳 | Door type metal detector |
| DE10011230A1 (en) * | 2000-03-08 | 2003-02-27 | Mesutronic Geraetebau Gmbh | Detector for sensing metal parts in nonconductive conveyed material, uses vectorial addition circuit to add signals from two or more sensors arranged along conveyor |
| WO2003027659A1 (en) * | 2001-09-21 | 2003-04-03 | Tok Engineering Co., Ltd. | Method for detecting metallic foreign matter and system for detecting metallic foreign matter |
| CN101650442A (en) * | 2009-09-15 | 2010-02-17 | 合肥安大电子检测技术有限公司 | Intelligent impurity metal detecting system and detecting method thereof |
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2010
- 2010-11-19 CN CN2010105514696A patent/CN102096110A/en active Pending
Patent Citations (6)
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|---|---|---|---|---|
| CN2225684Y (en) * | 1995-03-31 | 1996-04-24 | 广东工学院 | Metal dectecting instrument |
| JPH11337658A (en) * | 1998-05-22 | 1999-12-10 | Shinichi Nishimoto | Device for detecting metal object |
| CN2371566Y (en) * | 1999-05-26 | 2000-03-29 | 王祥驳 | Door type metal detector |
| DE10011230A1 (en) * | 2000-03-08 | 2003-02-27 | Mesutronic Geraetebau Gmbh | Detector for sensing metal parts in nonconductive conveyed material, uses vectorial addition circuit to add signals from two or more sensors arranged along conveyor |
| WO2003027659A1 (en) * | 2001-09-21 | 2003-04-03 | Tok Engineering Co., Ltd. | Method for detecting metallic foreign matter and system for detecting metallic foreign matter |
| CN101650442A (en) * | 2009-09-15 | 2010-02-17 | 合肥安大电子检测技术有限公司 | Intelligent impurity metal detecting system and detecting method thereof |
Non-Patent Citations (1)
| Title |
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| 张泉泉等: "一种金属探测器设计与实现", 《电子测量技术》 * |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103245975A (en) * | 2012-02-08 | 2013-08-14 | 淮南矿业(集团)有限责任公司 | Conveyor belt metal coupling head detection device and metal foreign substance detection system |
| CN103245975B (en) * | 2012-02-08 | 2016-04-06 | 淮南矿业(集团)有限责任公司 | The pick-up unit of travelling belt metal coupling head and foreign substance detection system |
| CN106910280A (en) * | 2017-02-04 | 2017-06-30 | 深圳怡化电脑股份有限公司 | The pre- reading circuit of chip card and finance self-help traction equipment |
| CN108710154A (en) * | 2018-06-27 | 2018-10-26 | 安徽金安矿业有限公司 | A kind of combined metal detection method and device |
| CN112147703A (en) * | 2020-09-25 | 2020-12-29 | 湖北理工学院 | Metal detector |
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Application publication date: 20110615 |