CN104297805A - Metal detection device - Google Patents
Metal detection device Download PDFInfo
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- CN104297805A CN104297805A CN201410625926.XA CN201410625926A CN104297805A CN 104297805 A CN104297805 A CN 104297805A CN 201410625926 A CN201410625926 A CN 201410625926A CN 104297805 A CN104297805 A CN 104297805A
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- 239000002184 metal Substances 0.000 title claims abstract description 45
- 229910052751 metal Inorganic materials 0.000 title claims abstract description 45
- 238000001514 detection method Methods 0.000 title abstract description 12
- 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
- 239000003990 capacitor Substances 0.000 abstract 3
- 238000007689 inspection Methods 0.000 abstract 1
- 230000010355 oscillation Effects 0.000 description 13
- 238000000034 method Methods 0.000 description 5
- 230000035945 sensitivity Effects 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 3
- 238000009933 burial Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000011835 investigation 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
- 230000033228 biological regulation Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000004020 conductor Substances 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000005284 excitation Effects 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
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Abstract
The invention provides a metal detection device which is characterized by comprising a 6V direct current power supply, a transformer feedback type LC high-frequency oscillator, a switching circuit, a Pi RC filter and a buzzer driving circuit, wherein the transformer feedback type LC high-frequency oscillator consists of an NPN type triode VT1, a high-frequency transformer T1, a capacitor C1, a linear potentiometer RP and a resistor R1; the switching circuit consists of an NPN type triode VT2, a resistor R2 and a switching diode D1; the Pi RC filter and the buzzer driving circuit consist of a capacitor C2, a resistor R3, a capacitor C3, an NPN type triode VT3 and a buzzer HA. The metal detection device has the benefits that a metal object is detected by the utilization of electromagnetic induction of an oscillator coil, for example, when a house is decorated, an electric wire or a reinforcing bar in a wall can be defected through the metal detection device so as to avoid construction risk and potential safety hazards; a metal detector for safety inspection can also be designed and manufactured according to the technical scheme of the invention.
Description
Technical field
The invention belongs to metal detection technical field, relate to a kind of metal detecting device.
Background technology
Metal detecting device is a kind of electronic device being used for detecting metal specially, except having except metal shell or metal parts for detection, it also can be used to detect hidden electric wire, the water pipe being embedded in underground or cable in wall, even can metallic cultural relics under subsurface investigation burial ground.
Because metal detecting device utilizes the electromagnetic induction of oscillator coil to detect metal object, as: when decorating house, electric wire within the walls or reinforcing bar can be detected, to avoid causing construction risk and potential safety hazard with it; The metal detector of safety check also can design and produce according to technical solutions according to the invention.
The circuit of metal detecting device all uses common components and parts to make, and cost of manufacture only needs tens yuan, is well suited for carrying out batch exploitation for factory.
Below describe in detail metal detecting device of the present invention necessity involved in implementation process, guardian technique content.
Summary of the invention
Goal of the invention and beneficial effect: metal detecting device is a kind of electronic device being used for detecting metal specially, except having except metal shell or metal parts for detection, it also can be used to detect hidden electric wire, the water pipe being embedded in underground or cable in wall, even can metallic cultural relics under subsurface investigation burial ground.Because metal detecting device utilizes the electromagnetic induction of oscillator coil to detect metal object, as: when decorating house, electric wire within the walls or reinforcing bar can be detected, to avoid causing construction risk and potential safety hazard with it; The metal detector of safety check also designs and produces according to technical solutions according to the invention.
Circuit working principle: metal detecting device is made up of high frequency oscillator, oscillating detector and power amplifier etc.High frequency oscillator is made up of elements such as NPN type triode VT1 and high-frequency transformer T1, and it is a kind of transformer feedback type LC high frequency oscillator.The primary coil L1 of high-frequency transformer T1 and electric capacity C1 forms LC parallel oscillation loop, and oscillation frequency is determined by the inductance value of primary coil L1 and the capacity of electric capacity C1, and oscillation frequency is about 200KHz.High-frequency transformer T1 secondary coil L2 as high frequency oscillator tickler, the base stage of its c termination NPN type triode VT1, its d termination switching diode D1.Because switching diode D1 is in forward conduction state, concerning high-frequency signal, d end can be considered connection circuit ground GND.In high-frequency transformer T1, if a end and d end are respectively the head end of primary coil L1, secondary coil L2, be then input to the feedback signal of NPN type triode VT1 base stage from c end, circuit can be made to form positive feedback and produce excitation high frequency vibration.The size of high frequency oscillator feedback voltage is relevant with the turn ratio of coil primary L1, secondary coil L2, and turn ratio is too small, and because feedback is too weak, be not easy starting of oscillation, turn ratio is excessive easily causes waveform distortion, also can make metal detecting device sensitivity decrease.NPN type triode VT1 biased electrical routing resistance R1 and switching diode D1 forms, and resistance R1 is the current-limiting resistance of switching diode D1.Because switching diode D1 forward threshold voltage is about 0.7V, be added to NPN type triode VT1 base stage by secondary coil L2 and obtain stable bias voltage.Obviously, this type voltage regulation biasing circuit can strengthen NPN type triode VT1 high frequency oscillator stability greatly.Linear potentiometer RP is connected between NPN type triode VT1 emitter and circuit ground GND, there is emitter current negative feedback, the resistance value of linear potentiometer RP is larger, negative feedback is stronger, the amplifying power of NPN type triode VT1 is also lower, even make circuit failure of oscillation, linear potentiometer RP is used for the tuning of high frequency oscillator gain.
On-off circuit is made up of NPN type triode VT2, resistance R2, switching diode D1, and filtered electrical routing capacitance C2, resistance R3, electric capacity C3 form.In on-off circuit, the base stage of NPN type triode VT2 is held with the c of secondary coil L2 and is connected, and when high frequency oscillator works, to be coupled the oscillator signal of coming through high-frequency transformer T1, positive half cycle makes NPN type triode VT2 conducting, NPN type triode VT2 collector output low level signal.When high frequency oscillator failure of oscillation swings, c holds dead-beat signal, because switching diode D1 is connected between NPN type triode VT2 emitter and circuit ground GND, NPN type triode VT2 base stage is reverse biased, NPN type triode VT2 is in cut-off state, NPN type triode VT2 current collection very high level, high level signal, through π type RC filter filtering, obtains high level signal in the base stage of NPN type triode VT3.As can be seen here, when high frequency oscillator normally works, NPN type triode VT2 collector obtaining low level signal, when failure of oscillation, is high level.
The detection metallic circuit course of work: the resistance of linear adjustment potentiometer RP, makes high frequency oscillator be in threshold oscillation state (just making high frequency oscillator starting of oscillation) just.When detecting coil L1 is near metal object, due to electromagnetic induction phenomenon, vortex flow will be produced in metallic conductor, energy loss in high frequency oscillation circuit is increased, positive feedback weakens, and is in the oscillations of threshold oscillation state, even cannot maintain the minimum energy needed for vibration and failure of oscillation.If this change can be detected, and becomes control signal by circuit conversion, according to hummer HA sound with or without judging whether there is metal object below detecting coil L1.
Accompanying drawing explanation
Accompanying drawing 1 is metal detecting device provided by the invention embodiment circuit working schematic diagram; Primary coil L1 is also referred to as detecting coil L1.
Embodiment
According to the metal detection device circuit fundamental diagram shown in accompanying drawing 1 and accompanying drawing explanation, and according to annexation between components and parts in each several part circuit described in summary of the invention, and components and parts technical parameter described in embodiment requires and circuit production main points are carried out enforcement and can be realized the present invention, is further described correlation technique of the present invention below in conjunction with embodiment.
Technical scheme: metal detecting device, it comprises 6V direct supply, transformer feedback type LC high frequency oscillator, on-off circuit, π type RC wave filter and buzzer drive circuit, it is characterized in that:
Transformer feedback type LC high frequency oscillator: it is by NPN type triode VT1, high-frequency transformer T1, electric capacity C1, linear potentiometer RP, resistance R1 forms, NPN type triode VT1 collector connects a end and electric capacity C1 one end of high-frequency transformer T1 primary coil L1, the b end of high-frequency transformer T1 primary coil L1 and electric capacity C1 mono-termination circuit positive pole VCC, NPN type triode VT1 emitter connects linear potentiometer RP one end, the linear potentiometer RP other end and movable end connection circuit ground GND thereof, NPN type triode VT1 base stage connects the c end of high-frequency transformer T1 secondary coil L1, the d termination on-off circuit 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 stage connects the c end of high-frequency transformer T1 secondary coil L1, NPN type triode VT2 collector is by resistance R2 connection circuit positive pole VCC, NPN type triode VT2 emitter connects switching diode D1 positive pole, switching diode D1 negative pole connection circuit ground GND;
π type RC wave filter and buzzer drive circuit: it is made up of electric capacity C2, resistance R3, electric capacity C3, NPN type triode VT3 and hummer HA, NPN type triode VT2 collector connects electric capacity C2 one end and resistance R3 one end, the NPN type triode VT3 base stage connecting resistance R3 other end and electric capacity C3 one end, the emitter connection circuit ground GND of the electric capacity C2 other end and the electric capacity C3 other end and NPN type triode VT3, NPN type triode VT3 collector connects hummer HA negative pole, hummer HA positive pole connection circuit positive pole VCC;
The positive pole connection circuit positive pole VCC of 6V direct supply, the negative pole connection circuit ground GND of 6V direct supply.
The technical parameter of components and parts and selection requirement thereof
| Element number | Components and parts title | Model or technical indicator | 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 | Vertical |
| C2 | Electric capacity | 0.01μF | 1 | Vertical |
| C3 | Electric capacity | 0.1μF | 1 | Vertical |
| HA | Hummer | Built-in audio circuit | 1 | Operating voltage 5V |
| T1 | High-frequency transformer | L1 encloses around 9 around 27 circles, L2 | 1 | With ￠ 0.25 enameled wire |
Circuit production main points, circuit debugging and using method
Because the circuit structure of metal detecting device is fairly simple, as long as the electronic devices and components performance generally selected is intact, and the components and parts annexation to specifications in accompanying drawing 1 is welded, mistake is not welded in primary coil L1, secondary coil L2 and two ends, physical connection line and welding quality are through carefully checking correctly, and circuit of the present invention only needs to carry out simple debugging and can normally work;
During adjustment metal detecting device sensitivity, detecting coil L1 will away from metal object, comprise the paper of band aluminium foil, then slow fine tuning linear potentiometer RP, hummer HA buzzer is stopped, finally finely tune linear potentiometer RP again, buzzer is just stopped, and at this moment the sensitivity of metal detecting device is the highest;
During metal detector detection metal object, as long as detecting coil L1 is close to any metal object, hummer HA just can sound a buzzer sound immediately, and when certain distance, hummer HA stops cry;
Metal detecting device of the present invention has higher sensitivity, during by its detection bulk metal, the distance of detection metal object can reach 20cm, little of one piece of paper clip, even one piece of pin can detect, but requires that detecting coil L1 must near fine metal object;
Metal detecting device complete machine quiescent current, namely hummer HA not sounding time, total current is about 10mA, and detect metal hummer HA when sounding a buzzer, complete machine working current rises to 25mA;
Circuit components layout of the present invention, circuit structure design, its shape of outward appearance and size etc. are not all make gordian technique of the present invention, neither the technical characteristic of application claims protection, therefore do not illustrate one by one in the description.
Claims (1)
1. a metal detecting device, it comprises 6V direct supply, transformer feedback type LC high frequency oscillator, on-off circuit, π type RC wave filter and buzzer drive circuit, it is characterized in that:
Described transformer feedback type LC high frequency oscillator is by NPN type triode VT1, high-frequency transformer T1, electric capacity C1, linear potentiometer RP, resistance R1 forms, NPN type triode VT1 collector connects a end and electric capacity C1 one end of high-frequency transformer T1 primary coil L1, the b end of high-frequency transformer T1 primary coil L1 and electric capacity C1 mono-termination circuit positive pole VCC, NPN type triode VT1 emitter connects linear potentiometer RP one end, the linear potentiometer RP other end and movable end connection circuit ground GND thereof, NPN type triode VT1 base stage connects the c end of high-frequency transformer T1 secondary coil L1, the d termination on-off circuit 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 connects the c end of high-frequency transformer T1 secondary coil L1, NPN type triode VT2 collector is by resistance R2 connection circuit positive pole VCC, NPN type triode VT2 emitter connects switching diode D1 positive pole, switching diode D1 negative pole connection circuit ground GND;
Described π type RC wave filter and buzzer drive circuit are made up of electric capacity C2, resistance R3, electric capacity C3, NPN type triode VT3 and hummer HA, NPN type triode VT2 collector connects electric capacity C2 one end and resistance R3 one end, the NPN type triode VT3 base stage connecting resistance R3 other end and electric capacity C3 one end, the emitter connection circuit ground GND of the electric capacity C2 other end and the electric capacity C3 other end and NPN type triode VT3, NPN type triode VT3 collector connects hummer HA negative pole, hummer HA positive pole connection circuit positive pole VCC;
Described 6V DC power anode connection circuit positive pole VCC, 6V DC power cathode connection 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 |
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| Publication Number | Publication Date |
|---|---|
| CN104297805A true CN104297805A (en) | 2015-01-21 |
| CN104297805B 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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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107765316A (en) * | 2017-09-25 | 2018-03-06 | 西安电子科技大学 | Cable trace detects multifrequency emission system and method, cable trace detecting instrument |
| CN109073775A (en) * | 2016-03-16 | 2018-12-21 | 桑斯特罗尼克简易股份公司 | The detection device of coefficient 1 and induction type |
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 |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109073775A (en) * | 2016-03-16 | 2018-12-21 | 桑斯特罗尼克简易股份公司 | The detection device of coefficient 1 and induction type |
| CN109073775B (en) * | 2016-03-16 | 2020-10-20 | 桑斯特罗尼克简易股份公司 | Coefficient 1 and inductive detection device |
| CN107765316A (en) * | 2017-09-25 | 2018-03-06 | 西安电子科技大学 | Cable trace detects multifrequency emission system and method, cable trace detecting instrument |
| 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 |
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| Publication number | Publication date |
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| CN104297805B (en) | 2017-03-29 |
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Inventor after: Yang Ruizhi Inventor before: Wu Jiantang |
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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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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: 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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