CN202614951U

CN202614951U - Metal detection device

Info

Publication number: CN202614951U
Application number: CN 201220300285
Authority: CN
Inventors: 傅清河
Original assignee: Individual
Current assignee: Individual
Priority date: 2012-06-21
Filing date: 2012-06-21
Publication date: 2012-12-19
Anticipated expiration: 2022-06-21

Abstract

The utility model relates to a metal detection device which comprises a metal detection circuit and a single chip microcomputer control circuit. Output singles of the metal detection circuit are transmitted to the single chip microcomputer control circuit through an oscillating circuit, and output signals of the single chip microcomputer control circuit are controlled and sent to a RS485 communication interface circuit. When the metal detection device detects that precious metal is hidden, signals are acquired through the metal detection circuit, judged by the single chip microcomputer control circuit and transmitted to computer alarm monitoring system software to be displayed, monitoring and management are combined together effectively, and the metal detection device has the advantages of being humanized in monitoring, strong in practical applicability and the like.

Description

A kind of metal detecting device

Technical field

The utility model relates to a kind of sniffer, particularly be a kind of metal detecting device.

Background technology

Because precious metals such as copper, gold need personnel to process in process; But owing to restrictions such as law do not allow to search the person, factory's precious metal is often stolen, has caused economic loss.

The utility model content

The purpose of the utility model is to provide a kind of metal detecting device.

The utility model solves the technical scheme that its technical matters adopted: a kind of metal detecting device; Comprise metal detection circuit and single chip machine controlling circuit; The output signal of said metal detection circuit transfers to single chip machine controlling circuit through oscillatory circuit, and the output signal controlling of said single chip machine controlling circuit is sent to the RS485 communication interface circuit.

Preferably, said metal detection circuit adopts inductance probe LB to gather metal signal.

Preferably, said oscillatory circuit is connected to triode Q1 formation capacitance connecting three point type oscillator through the output terminal of inductance probe LB through capacitor C1, C2.

Preferably, said RS485 communication interface circuit is connected to the COM end of PC through SN75176 communication interface chip IC2.

Through adopting above-mentioned technical scheme; The beneficial effect of the utility model is: the utility model detects when keeping precious metal; After the collection of metal detection circuit, after single chip machine controlling circuit is judged, reach the alarm computer monitor system software and show; Reach monitoring and effectively combine, have that hommization is monitored, advantage such as practical with management.

Description of drawings

Fig. 1 is the frame assumption diagram of the utility model;

Fig. 2 is the circuit theory diagrams of the utility model.

Embodiment

Below in conjunction with accompanying drawing the utility model is done further to specify.

Like Fig. 1, shown in Figure 2; A kind of metal detecting device of the utility model; Comprise metal detection circuit 1 and single chip machine controlling circuit 2; The output signal of said metal detection circuit 1 transfers to single chip machine controlling circuit 2 through oscillatory circuit 11, and the output signal controlling of said single chip machine controlling circuit 2 is sent to RS485 communication interface circuit 21.

Said metal detection circuit 1 adopts inductance probe LB to gather metal signal; Said oscillatory circuit 11 is connected to triode Q1 formation capacitance connecting three point type oscillator through the output terminal of inductance probe LB through capacitor C1, C2; Major part is an oscillator that is in critical conditions, and during near inductance probe LB, the electromagnetic field that produces in its coil will induce eddy current in metal as metal; This energy loss derives from oscillatory circuit itself, is equivalent to increase in the circuit loss resistance.If metal and inductance probe LB are nearer, the loss in the circuit strengthens, and the coil value reduces, and makes originally to quit work with regard to the oscillator that is in the vibration critical conditions.When the base stage of the ac equivalent circuit triode Q1 of capacitance connecting three point type oscillator has a positive signal, because the acting in opposition of triode Q1 makes its collector signal for negative, through the feedback of capacitor; Signal on the base stage of triode Q1 and original homophase; Because this is positive feedback, so circuit can produce vibration, the existence of resistance R 2 and R3; Slackened the positive feedback signal in the circuit, circuit is under the state of starting of oscillation just.

As the inductance probe LB of metal detector during near the person, if when workman's body keeps metal object, oscillatory circuit 11 failure of oscillations; There is not signal to pass through capacitor C1, C2; This signal is through capacitor C 4 couplings, and resistance R 7 current limlitings are input to the 37th pin I/O of single-chip microcomputer IC1, is the high potential signal input this moment.When single-chip microcomputer IC1 detects the A1 point for high level state; After single-chip microcomputer IC1 judges, form RS485 communication interface circuit 21 by the 10th, 11,25 pin of SN75176 communication interface chip IC2 and single-chip microcomputer IC1, IC1 sends data-signal by single-chip microcomputer; After SN75176 communication interface chip IC2 decoding; The 6th, 7 ends of SN75176 communication interface chip IC2 transfer two buses to and are connected to PC, and to PC transmission current state information, the PC configuration software shows metal object.

When treating metal object taken out, if metal and inductance probe LB are far away, the loss in the circuit diminishes, and oscillatory circuit 11 is started working, the 37th pin I/O of single-chip microcomputer IC1, and import for electronegative potential this moment.When single-chip microcomputer IC1 detects the A1 point for low level state; After single-chip microcomputer IC1 judged, IC1 sent data-signal by single-chip microcomputer, after SN75176 communication interface chip IC2 decoding; Its 6th, 7 end transfers two buses to and is connected to PC; The PC configuration software shows does not find metal object, adopts said method, realizes hommization monitoring, advantage such as practical.

An above-described preferred embodiment that is merely the utility model can not limit the scope that the utility model is implemented, and every equalization of being done according to the utility model claim changes and decorates, and all should still belong in the scope that the utility model contains.

Claims

1. metal detecting device; It is characterized in that: comprise metal detection circuit (1) and single chip machine controlling circuit (2); The output signal of said metal detection circuit (1) transfers to single chip machine controlling circuit (2) through oscillatory circuit (11), and the output signal controlling of said single chip machine controlling circuit (2) is sent to RS485 communication interface circuit (21).

2. metal detecting device according to claim 1 is characterized in that: said metal detection circuit (1) adopts inductance probe LB to gather metal signal.

3. metal detecting device according to claim 2 is characterized in that: said oscillatory circuit (11) is connected to triode Q1 formation capacitance connecting three point type oscillator through the output terminal of inductance probe LB through capacitor C1, C2.

4. metal detecting device according to claim 1 and 2 is characterized in that: said RS485 communication interface circuit (21) is connected to the COM end of PC through SN75176 communication interface chip IC2.