CN2096848U

CN2096848U - Universal inductive switch

Info

Publication number: CN2096848U
Application number: CN 91210989
Authority: CN
Inventors: 马晶
Original assignee: Individual
Current assignee: Individual
Priority date: 1991-08-03
Filing date: 1991-08-03
Publication date: 1992-02-19

Abstract

The utility model discloses a universal inductive switch, which is characterized in that a probe head a probe welded on an electric control board form inserting connection, the probe head and the electric control board are inserted in an outer shell, an insulating layer at the outside of the probe head is glued with the outer shell, the probe head is connected with capacitance arranged in an unbalance capacitance bridge of an open-circuit condition in a sample circuit, and a control board is composed of the sample circuit, a comparison circuit, a change-over circuit, an option switch, a power amplification circuit, and a power supply circuit. The utility model has the advantages of large range of an inductor, wide range of application, and strong versatility, applied to the testing of materials and automatic control of various conductive bodies, semiconductors, and insulators.

Description

Universal inductive switch

The utility model relates to a kind of induction sensitive switch, and particularly a kind of can the generation various materials responded to, and its induced signal is converted into the switch of switching value signal.Be suitable for the detection of various materials and control automatically.

Existing inductive switch, general all is to a kind of specific conductor or semiconductor substance generation induction, realization detection of output control signal or automatic control; The shortcoming of this inductive switch is a certain material demand outfit inductive switch correspondingly.

The purpose of this utility model provides and a kind ofly not only can produce induced signal to conductor and semiconductor substance, and all can produce the inductive switch of induced signal for all kinds of non-conductor materials (solid-state, liquid state or powder state).

The purpose of this utility model is achieved in that inductive switch is made up of inductive head and automatically controlled circuit board two parts, inductive head is by probe and insulating barrier is glued together forms, the probe that is welded on probe and the automatically controlled circuit board is pegged graft, probe and automatically controlled circuit board are plugged among the steel shell cylindraceous, and the insulating barrier and the shell of probe outside are glued together; Automatically controlled circuit board is made up of sample circuit, comparison and change-over circuit, selector switch, power amplifier and power circuit; An arm capacitor C 6 that is in the uneven capacitance bridge of open-circuit condition in probe and the sample circuit is connected, the electric bridge output passes through by the BG2 triode, collector resistance R7, capacitor C 8 is connected with the input pin 6 of double operational integrated circuit (IC) 2 in the change-over circuit with comparing with the switching circuit that diode is formed, simultaneously with by R1, potentiometer W, capacitor C 3, diode is connected with the sensitivity adjusting circuit that resistance R 5 is formed, comparison and change-over circuit are by double operational integrated circuit (IC) 2 pin 3,4,5,7 and by triode BG4, the selected on-off circuit that resistance R 12-17 capacitance C9 and single-pole double-throw switch (SPDT) K are formed, power amplifier is connected, relay J and relay indicating light diode (LED) are serially connected in the collector loop of power tube BG3, and pass through power discharging transistor BG3 base resistance and relatively link to each other with double operational integrated circuit (IC) 2 output pin 1 in the change-over circuit; The other end of relay J is connected on the rectification bridge output end in the power circuit, and relay J protection diode IN4004 is attempted by the relay coil two ends.

The utlity model has and be applicable to various conductors, semiconductor and insulator material are detected and control that it is big to have the inductor scope, the scope of application is wide, highly versatile, characteristic of simple structure.

Below in conjunction with accompanying drawing the utility model is described in further detail.

Fig. 1 is the utility model basic circuit diagram.

Fig. 2 is the utility model general structure schematic diagram.

With reference to Fig. 1,2, stainless steel casing 5 one ends of the column type of long 120mm have round end cap 3, and end cap 3 middles have a wire hole 2 and LED light portals 1, and shell 5 is processed into the long screw thread of 80mm near end cap 3 one sides, so that the fixing usefulness of inductive switch integral body; Shell 5 other ends are installed with inductive head; Inductive head is made up of the insulating barrier 6 and the metal probe 8 of thick 15mm high insulation resistance, probe 8 and insulating barrier 6 compose one, the corresponding probe that is welded of popping one's head on the probe jack 7 of 8 bottoms and the wiring board 4 is pegged graft, and assurance excellent conducting performance, wiring board 4 is plugged among the shell 5 by guide groove, gummed all-in-one-piece probe 8 and insulating barrier 6 also are plugged on shell 5 one end inside, and blended rubber is adhesively fixed; The alternating current 220V power supply is reduced to through step-down transformer B and is exchanged 18 volts, full-wave bridge rectifier circuit and the filter capacitor C1 that forms via 4 IN4004 diodes again, output 22V direct voltage, for relay J provides operating voltage, the 22V direct voltage is exported a stable direct current 12V power supply after integrated regulator IC1 and filter capacitor C2; When direct current 12V power supply when L2 one end is added in the sample circuit, the circuit of being made up of L2, BG1, L3 and divider resistance R2, R3, R4 is a starting oscillation, for sensor circuit provides sampling period and oscillation source, and is coupled to sensor circuit through L1; Sensor circuit is made up of the unbalanced bridge that C4-7 and L1 constitute, and C6 is in open-circuit condition; When the probe that welds mutually with C6 during by probe 8 contacts or near testee, be equivalent in the C6 access circuit, make unbalanced bridge produce vibration, the A terminal potential is changed, and make the BG2 conducting by resistance R 6, and cause double operational integrated circuit (IC) 2 and 6 pin current potentials in comparison and the change-over circuit to descend rapidly, adjust partial pressure potential device W, can change the basic current potential of A point, thereby reach the purpose of regulating induction sensitivity.Relatively and in the change-over circuit, selector switch K places " moving closing " a position, and when no testee during near to or in contact with inductive probe 8, owing to BG2 is in cut-off state, 6 pin of IC2 are in about high potential 5V, and 5 pin 3.8V, 7 pin are output as the OV low level.As testee during near to or in contact with inductive probe 8, because BG2 conducting, cause the 6 pin current potentials of IC2 to descend rapidly, the 7 pin conversion output high level " 1 " of IC2,3 pin are also exported high level " 1 ", and 1 pin is the high level " 1 " of conversion output simultaneously also, make power tube BG3 conducting, the relay J adhesive, the LED that is serially connected in the power tube BG3 collector circuit is glittering, the operating state of indicating circuit.When selector switch placed " moving disconnected " b position, because 7 pin of IC2 output OV low level, BG4 ended, 3 pin of IC2 are obtained " 1 " high level by divider resistance R16, R17, make the 1 pin output high level " 1 " of IC2, power tube BG3 conducting, the relay J adhesive, LED is glittering; When testee near to or in contact with probe 8 the time, because the 6 pin current potentials of IC2 descend, 7 pin current potentials are converted to high level " 1 " and are directed at the BG4 conducting, make the 3 pin current potentials conversion of IC2 drop to low level " 0 ", cause the 1 pin current potential of IC2 to drop to low level " 0 ", power tube BG3 ends, and relay J discharges, and LED extinguishes.

Claims

1, a kind of general-purpose inductive switch of forming by inductive head, automatically controlled circuit board, it is characterized in that popping one's head in and automatically controlled circuit board on the probe that is welded peg graft, probe and automatically controlled circuit board are plugged among the steel shell cylindraceous, and the insulating barrier and the shell of probe outside are glued together; Automatically controlled circuit board is made up of sample circuit, comparison and change-over circuit, selector switch, power amplifier and power circuit; An arm capacitor C 6 that is in the uneven capacitance bridge of open-circuit condition in probe and the sample circuit is connected, the electric bridge output passes through by the BG2 triode, collector resistance R7, capacitor C 8 is connected with the input pin 6 of double operational integrated circuit (IC) 2 in the change-over circuit with comparing with the switching circuit that diode is formed, simultaneously with by R1, potentiometer W, capacitor C 3, diode is connected with the sensitivity adjusting circuit that resistance R 5 is formed, comparison and change-over circuit are by double operational integrated circuit pin 3,4,5,7 and by triode BG4, the selected on-off circuit that resistance R 12-17 capacitance C9 and single-pole double-throw switch (SPDT) K are formed, power amplifier is connected, relay J and relay indicating light diode (LED) are serially connected in the collector loop of power tube BG3, and pass through power discharging transistor BG3 base resistance and relatively link to each other with double operational integrated circuit (IC) 2 output pin 1 in the change-over circuit; The other end of relay J is connected on the rectification bridge output end in the power circuit, and relay J protection diode IN4004 is attempted by the relay coil two ends.

2, general-purpose inductive switch according to claim 1 is characterized in that the long 120mm of shell, near end cap one side the long screw thread of 80mm is arranged, and hole of light emitting diode and wire hole are arranged at the cover plate bottom.