CN104297805B - Metal detecting device - Google Patents
Metal detecting device Download PDFInfo
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- CN104297805B CN104297805B CN201410625926.XA CN201410625926A CN104297805B CN 104297805 B CN104297805 B CN 104297805B CN 201410625926 A CN201410625926 A CN 201410625926A CN 104297805 B CN104297805 B CN 104297805B
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- type triode
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- high frequency
- electric capacity
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- 239000002184 metal Substances 0.000 title claims abstract description 43
- 229910052751 metal Inorganic materials 0.000 title claims abstract description 43
- 230000005611 electricity Effects 0.000 claims description 5
- 239000000203 mixture Substances 0.000 claims description 3
- 230000000694 effects Effects 0.000 claims description 2
- 230000005674 electromagnetic induction Effects 0.000 abstract description 4
- 238000010276 construction Methods 0.000 abstract description 3
- 230000003014 reinforcing effect Effects 0.000 abstract description 3
- 230000010355 oscillation Effects 0.000 description 13
- 238000001514 detection method Methods 0.000 description 8
- 230000035945 sensitivity Effects 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 238000009933 burial Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 229910001111 Fine metal Inorganic materials 0.000 description 1
- 239000005030 aluminium foil Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000004020 conductor Substances 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 238000011835 investigation Methods 0.000 description 1
- 230000003534 oscillatory effect Effects 0.000 description 1
- 230000000087 stabilizing effect Effects 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
Abstract
The invention provides a kind of metal detecting device, its feature includes：6V DC sources, transformer feedback type LC high frequency generator, on-off circuit, π types RC wave filter and buzzer drive circuit；Described transformer feedback type LC high frequency generator is made up of NPN type triode VT1, high frequency transformer T1, electric capacity C1, linear potentiometer RP, resistance R1；Described on-off circuit is made up of NPN type triode VT2, resistance R2, switching diode D1；Described π types RC wave filter and buzzer drive circuit are made up of electric capacity C2, resistance R3, electric capacity C3, NPN type triode VT3 and buzzer HA.The present invention detects metal object using the electromagnetic induction of oscillator coil, such as：In decorating house, electric wire within the walls or reinforcing bar can be detected with it, to avoid causing construction risk and potential safety hazard；The metal detector of safety check also can be designed and produced according to technical solutions according to the invention.
Description
Technical field
The invention belongs to metal detection technical field, is related to a kind of metal detecting device.
Background technology
Metal detecting device be specifically used to detect metal a kind of electronic machine, except for detection have metal shell or
Outside metal parts, it may further be used to detect hidden electric wire in wall, is embedded in the water pipe or cable of underground, or even being capable of ground
Metallic cultural relics under lower detection burial ground.
Due to metal detecting device using the electromagnetic induction of oscillator coil detecting metal object, such as：In decorating house,
Electric wire within the walls or reinforcing bar can be detected with it, to avoid causing construction risk and potential safety hazard；The metal detection of safety check
Device also can be designed and produced according to technical solutions according to the invention.
The circuit of metal detecting device is all made using common components and parts, and cost of manufacture only needs more than ten yuan, is well suited for using
Batch exploitation is carried out in factory.
Metal detecting device of the present invention described further below is necessary, key involved by implementation process
Technology contents.
The content of the invention
Goal of the invention and beneficial effect：Metal detecting device is a kind of electronic machine for being specifically used to detect metal, except
Outside having metal shell or metal parts for detection, it may further be used to detect hidden electric wire in wall, is embedded in underground
Water pipe or cable, in addition can be under subsurface investigation burial ground metallic cultural relics.As metal detecting device is using oscillator coil
Electromagnetic induction detecting metal object, such as：In decorating house, electric wire within the walls or reinforcing bar can be detected with it, to avoid
Cause construction risk and potential safety hazard；The metal detector of safety check is also designed and produced according to technical solutions according to the invention.
Circuit operation principle：Metal detecting device is made up of high frequency generator, oscillating detector and power amplifier etc..It is high
Frequency agitator is made up of the element such as NPN type triode VT1 and high frequency transformer T1, and it is a kind of transformer feedback type LC high frequency vibrating
Swing device.The primary coil L1 and electric capacity C1 composition LC parallel oscillations loop of high frequency transformer T1, frequency of oscillation is by primary coil L1
Inductance value and the capacity of electric capacity C1 determine that frequency of oscillation is about 200KHz.High frequency transformer T1 secondary coil L2 are used as high frequency
Oscillator feedback coil, its c terminate the base stage of NPN type triode VT1, and its d terminates switching diode D1.Due to switching diode
D1 is in forward conduction state, and for high-frequency signal, d ends can be considered and meet circuit ground GND.In high frequency transformer T1, if a
End and d ends are respectively primary coil L1, the head end of secondary coil L2, then be input to the anti-of NPN type triode VT1 base stage from c ends
Feedback signal, can make circuit form positive feedback and produce the self-excitation higher-order of oscillation.At the beginning of the size and coil of high frequency generator feedback voltage
Level L1, secondary coil L2 turn ratio it is relevant, turn ratio is too small, too weak due to feeding back, it is not easy to starting of oscillation, and turn ratio is excessive easily
Cause waveform distortion, can also make metal detecting device sensitivity decrease.NPN type triode VT1 biased electrical routing resistance R1
Constitute with switching diode D1, current-limiting resistances of the resistance R1 for switching diode D1.Due to switching diode D1 positive thresholds electricity
Pressure about 0.7V, is added to NPN type triode VT1 base stage by secondary coil L2 and obtains stable bias voltage.Obviously, this voltage stabilizing
Formula biasing circuit can greatly enhance NPN type triode VT1 high frequency generator stability.NPN type triode VT1 emitter stage and electricity
Linear potentiometer RP is connected between road ground GND, with emitter current negative feedback, the resistance value of linear potentiometer RP is got over
Greatly, negative feedback is stronger, and the amplifying power of NPN type triode VT1 is also lower, or even makes circuit failure of oscillation, linear potentiometer
RP is used for the tuning of high frequency generator gain.
On-off circuit is made up of NPN type triode VT2, resistance R2, switching diode D1, filtered electrical routing capacitance C2, electricity
Resistance R3, electric capacity C3 compositions.In on-off circuit, the base stage of NPN type triode VT2 is connected with the c ends of secondary coil L2, works as high frequency
During oscillator operation, the oscillator signal that Jing high frequency transformers T1 couplings come, positive half cycle turn on NPN type triode VT2, NPN
Type audion VT2 colelctor electrodes export low level signal.When high frequency generator failure of oscillation swings, c ends dead-beat signal, due to switch two
Pole pipe D1 is connected between NPN type triode VT2 emitter stage and circuit ground GND, and NPN type triode VT2 base stage is reverse biased,
NPN type triode VT2 is in cut-off state, and NPN type triode VT2 current collection extremely high level, high level signal are filtered through π types RC
Ripple device is filtered, and obtains high level signal in the base stage of NPN type triode VT3.It thus is seen that working as high frequency generator normal work
When, low level signal is obtained on NPN type triode VT2 colelctor electrode, in failure of oscillation, be high level.
The detection metallic circuit course of work：The resistance of linear adjustment potentiometer RP, makes high frequency generator just in critical
Oscillatory regime (just makes high frequency generator starting of oscillation).When search coil L1 is near metal object, due to electromagnetic induction phenomenon, will
Vortex flow is produced in metallic conductor, the energy loss increase in high frequency oscillation circuit is made, positive feedback weakens, in threshold oscillation
The oscillations of state, in addition be unable to maintain that vibration needed for minimum energy and failure of oscillation.If this change can be detected, and lead to
Oversampling circuit is converted into control signal, is whether there is according to buzzer HA sound and can determine that below search coil L1 with the presence or absence of metal object
Body.
Description of the drawings
Accompanying drawing 1 is metal detecting device one embodiment circuit fundamental diagram that the present invention is provided；Primary coil L1
Referred to as search coil L1.
Specific embodiment
According to metal detection device circuit fundamental diagram and description of the drawings shown in accompanying drawing 1, and according to content of the invention institute
Annexation between components and parts in each several part circuit stated, and the components and parts technical parameter requirement described in embodiment and electricity
Road makes main points and is implemented to be capable of achieving the present invention, and with reference to embodiments the correlation technique of the present invention is further retouched
State.
Technical scheme：Metal detecting device, it includes 6V DC sources, transformer feedback type LC high frequency generator, switch
Circuit, π types RC wave filter and buzzer drive circuit, it is characterised in that：
Transformer feedback type LC high frequency generator：It is by NPN type triode VT1, high frequency transformer T1, electric capacity C1, linear
Potentiometer RP, resistance R1 are constituted, and NPN type triode VT1 colelctor electrode meets a ends of high frequency transformer T1 primary coil L1 and electric capacity C1
One end, the b ends of high frequency transformer T1 primary coil L1 and the termination circuit anode VCC of electric capacity C1 mono-, the transmitting of NPN type triode VT1
Pole connects linear potentiometer RP one end, the linear potentiometer RP other ends and its activity termination circuit ground GND, NPN type triode VT1 base
Pole connects the c ends of high frequency transformer T1 secondary coil L1, the d termination on-off circuits of high frequency transformer T1 secondary coil L1；
On-off circuit：It is made up of NPN type triode VT2, resistance R2, switching diode D1, NPN type triode VT2 base
Pole connects the c ends of high frequency transformer T1 secondary coil L1, and NPN type triode VT2 colelctor electrode meets circuit anode VCC by resistance R2,
NPN type triode VT2 emitter stage connects switching diode D1 positive poles, and switching diode D1 negative poles meet circuit ground GND；
π types RC wave filter and buzzer drive circuit：It by electric capacity C2, resistance R3, electric capacity C3, NPN type triode VT3 and
Buzzer HA is constituted, and NPN type triode VT2 colelctor electrode connects electric capacity C2 one end and resistance R3 one end, NPN type triode VT3 base stage
The emitter stage of the connecting resistance R3 other ends and electric capacity C3 one end, the electric capacity C2 other ends and the electric capacity C3 other ends and NPN type triode VT3
Circuit ground GND is met, NPN type triode VT3 colelctor electrode connects buzzer HA negative poles, and buzzer HA positive poles meet circuit anode VCC；
The positive pole of 6V DC sources meets circuit anode VCC, and the negative pole of 6V DC sources meets circuit ground GND.
The technical parameter of components and parts and its selection are required
| Element number | Components and parts title | Model or technical specification | Quantity | Remarks |
| VT1～VT3 | NPN type triode | 2SC9014C | 3 | |
| D1 | Switching diode | 1N4148 | 1 | |
| RP | Linear potentiometer | 1W、5.6KΩ | 1 |
| R1 | Metalfilmresistor | 2.7KΩ、1/8W | 1 | |
| R2 | Metalfilmresistor | 270KΩ、1/8W | 1 | |
| R3 | Metalfilmresistor | 47KΩ、1/8W | 1 | |
| C1 | Electric capacity | 3300PF | 1 | It is vertical |
| C2 | Electric capacity | 0.01μF | 1 | It is vertical |
| C3 | Electric capacity | 0.1μF | 1 | It is vertical |
| HA | Buzzer | Built-in audio circuit | 1 | Running voltage 5V |
| T1 | High frequency transformer | L1 is around 27 circles, L2 around 9 circles | 1 | With 0.25 enamel-covered wires of ￠ |
Circuit production main points, circuit debugging and using method
Because the circuit structure of metal detecting device it is fairly simple, as long as generally select electronic devices and components performance it is complete
It is good, and the components and parts annexation in accompanying drawing 1 is welded to specifications, primary coil L1, secondary coil L2 and two ends
Mistake should not be welded, after going through correctly, the circuit of the present invention only needs to carry out letter for physical connection line and welding quality
Dull examination can normal work；
During adjustment metal detecting device sensitivity, search coil L1 will be away from metal object, including the paper with aluminium foil, so
Slow fine tuning linear potentiometer RP, stops buzzer HA buzzers, finally finely tunes linear potentiometer RP again, make buzzer firm afterwards
Stop well, at this moment the sensitivity highest of metal detecting device；
During metal detector detection metal object, as long as search coil L1 is close to any metal object, buzzer HA will
Sound a buzzer immediately sound, as far as certain distance when buzzer HA stop cry；
Metal detecting device of the present invention has higher sensitivity, when detecting bulk metal with it, detects metal object
The distance of body up to 20cm, little to one piece paper clip, or even one piece of pin can detect, but require that search coil L1 must
Fine metal object must be abutted；
The whole machine quiescent current of metal detecting device, i.e. buzzer HA not sounding when, total current is about 10mA, detects metal
When buzzer HA sounds a buzzer, whole machine operating current rises to 25mA；
The circuit components layout of the present invention, circuit structure design, the shape of its outward appearance and size etc. are not
The key technology of the present invention is made, nor claimed technical characteristic, therefore do not illustrate one by one in the description.
Claims (1)
1. a kind of metal detecting device, it includes 6V DC sources, transformer feedback type LC high frequency generator, on-off circuit, π types
RC wave filter and buzzer drive circuit, it is characterised in that：
Described transformer feedback type LC high frequency generator is by NPN type triode VT1, high frequency transformer T1, electric capacity C1, linear electricity
Position device RP, resistance R1 compositions, NPN type triode VT1 colelctor electrode meet a ends of high frequency transformer T1 primary coil L1 and electric capacity C1 mono-
End, the b ends of high frequency transformer T1 primary coil L1 and the termination circuit anode VCC of electric capacity C1 mono-, NPN type triode VT1 emitter stage
Connect linear potentiometer RP one end, the linear potentiometer RP other ends and its activity termination circuit ground GND, NPN type triode VT1 base stage
Connect the c ends of high frequency transformer T1 secondary coil L1, the d termination on-off circuits of high frequency transformer T1 secondary coil L1；
Described on-off circuit is made up of NPN type triode VT2, resistance R2, switching diode D1, NPN type triode VT2 base stage
The c ends of high frequency transformer T1 secondary coil L1 are connect, NPN type triode VT2 colelctor electrode meets circuit anode VCC, NPN by resistance R2
Type audion VT2 emitter stages connect switching diode D1 positive poles, and switching diode D1 negative poles meet circuit ground GND；
Described π types RC wave filter and buzzer drive circuit by electric capacity C2, resistance R3, electric capacity C3, NPN type triode VT3 and
Buzzer HA is constituted, and NPN type triode VT2 colelctor electrode connects electric capacity C2 one end and resistance R3 one end, NPN type triode VT3 base stage
The emitter stage of the connecting resistance R3 other ends and electric capacity C3 one end, the electric capacity C2 other ends and the electric capacity C3 other ends and NPN type triode VT3
Circuit ground GND is met, NPN type triode VT3 colelctor electrode connects buzzer HA negative poles, and buzzer HA positive poles meet circuit anode VCC；
Described 6V DC power anodes meet circuit anode VCC, and 6V DC power cathodes meet circuit ground GND.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410625926.XA CN104297805B (en) | 2014-11-07 | 2014-11-07 | Metal detecting device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410625926.XA CN104297805B (en) | 2014-11-07 | 2014-11-07 | Metal detecting device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN104297805A CN104297805A (en) | 2015-01-21 |
| CN104297805B true CN104297805B (en) | 2017-03-29 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410625926.XA Expired - Fee Related CN104297805B (en) | 2014-11-07 | 2014-11-07 | Metal detecting device |
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| Country | Link |
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| CN (1) | CN104297805B (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR3049068B1 (en) * | 2016-03-16 | 2018-04-06 | Senstronic | INDUCTIVE FACTOR DETECTOR DEVICE 1 |
| CN107765316B (en) * | 2017-09-25 | 2020-07-24 | 西安电子科技大学 | Cable path detection multi-frequency emission system and method and cable path detection instrument |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3919629A (en) * | 1973-11-05 | 1975-11-11 | Carol L Scruggs | Proximity sensing device using an inductance and capacitance resonant bridge network |
| CN201852950U (en) * | 2010-08-26 | 2011-06-01 | 刘家发 | Portable metal detection device |
| CN102520452A (en) * | 2011-11-23 | 2012-06-27 | 刘德军 | Inductance type metal detector |
| CN202494785U (en) * | 2012-03-22 | 2012-10-17 | 成都措普科技有限公司 | Metal detector |
| CN103412340A (en) * | 2013-08-29 | 2013-11-27 | 高玉琴 | Metal detector |
| CN103558640A (en) * | 2013-11-10 | 2014-02-05 | 吴建堂 | Security check channel metal detecting device |
| CN204101745U (en) * | 2014-11-07 | 2015-01-14 | 吴建堂 | Metal detecting device |
-
2014
- 2014-11-07 CN CN201410625926.XA patent/CN104297805B/en not_active Expired - Fee Related
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3919629A (en) * | 1973-11-05 | 1975-11-11 | Carol L Scruggs | Proximity sensing device using an inductance and capacitance resonant bridge network |
| CN201852950U (en) * | 2010-08-26 | 2011-06-01 | 刘家发 | Portable metal detection device |
| CN102520452A (en) * | 2011-11-23 | 2012-06-27 | 刘德军 | Inductance type metal detector |
| CN202494785U (en) * | 2012-03-22 | 2012-10-17 | 成都措普科技有限公司 | Metal detector |
| CN103412340A (en) * | 2013-08-29 | 2013-11-27 | 高玉琴 | Metal detector |
| CN103558640A (en) * | 2013-11-10 | 2014-02-05 | 吴建堂 | Security check channel metal detecting device |
| CN204101745U (en) * | 2014-11-07 | 2015-01-14 | 吴建堂 | Metal detecting device |
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| Publication number | Publication date |
|---|---|
| CN104297805A (en) | 2015-01-21 |
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| C41 | Transfer of patent application or patent right or utility model | ||
| CB03 | Change of inventor or designer information |
Inventor after: Yang Ruizhi Inventor before: Wu Jiantang |
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| TA01 | Transfer of patent application right |
Effective date of registration: 20170215 Address after: 250000 Shandong City, Ji'nan Province Flyover District emerald County North District, building 3, unit 402, No. 25 Applicant after: Yang Ruizhi Address before: 233000 Bengbu, China, Anhui, China, the main street in the mountains of mussels, No. 406 Applicant before: Wu Jiantang |
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Inventor after: Wang Caifen Inventor before: Yang Ruizhi |
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Effective date of registration: 20170810 Address after: 301700 Tianjin city Wuqing district under Zhuzhuang Street on the west side of the Sheung Shui Guang Xian Lu garden 24 Building 1 unit 801 Patentee after: Wang Caifen Address before: 250000 Shandong City, Ji'nan Province Flyover District emerald County North District, building 3, unit 402, No. 25 Patentee before: Yang Ruizhi |
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Effective date of registration: 20180322 Address after: 312300 Shangyu District City Station International Square 36-1-101, Shaoxing, Zhejiang Patentee after: Zhejiang Hongsheng Technology Transfer Services Ltd. Address before: 301700 Tianjin city Wuqing district under Zhuzhuang Street on the west side of the Sheung Shui Guang Xian Lu garden 24 Building 1 unit 801 Patentee before: Wang Caifen |
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Effective date of registration: 20180604 Address after: 516000 shop 110, Dongan garden, Huicheng District, Huizhou, Guangdong. Patentee after: Guangdong shield Police Equipment Co., Ltd. Address before: 312300 Zhejiang city Shaoxing Shangyu City Station International Plaza 36-1-101 Patentee before: Zhejiang Hongsheng Technology Transfer Services Ltd. |
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