SU752408A1 - Contact-free sensor for registering small metallic articles - Google Patents

Description

one

The invention relates to the field of automating production processes and may not be used in automatic assembly of products or automatic machines for counting and packaging details.

Non-contact sensors are known, the use of which is based on the breakdown of the oscillations of a high-frequency oscillator, built on a transistor and consisting of two electrical circuits, one of which is included in the collector price of the transistor, and the other, whose inductance is a sensitive sensor element , tuned in resonance with the first one and included in the emitter's value in parallel with the additional coil of inductance

 The disadvantage of such a sensor is

the complexity of its circuit, since it requires a full-optical oscillating circuit, 20 inductance coil, positive feedback circuit elements.

Most of the technical essence is a high-frequency sensor, the content of a high-frequency generator, 25 made on the transistor, to the collector of which the oscillating circuit is connected, to the driver - a common point of the capacitor, and to the base of the transistor of the nodes; . Cro 30

2

In addition, parallel to the oscillating circuit eMKOCTii is the bottom 2.

The disadvantage of this device is not very high sensitivity.

The purpose of the 13th acquisition is to improve the sensor's visibility.

This is achieved by the fact that a device containing a high-frequency oscillator, made on a trap, with an oscillating circuit on the collector, a common point of the capacitive divider, and a common divider point on the resistors, an inductance coil, one output connected to the transistor base. The windings of which are connected to the first capacitor of the capacitive divider, the second capacitor of which is connected to the oscillatory circuit and the other end of the winding of the inductor is connected to the power supply.

The scheme of the invention is shown in the drawing.

The sensor consists of a high-frequency generator I, a receiver II, and an output signal amplifier III. The high frequency generator I generates a high frequency voltage. It is made on the transistor 1 according to the capacitive three-point scheme. It consists of resistors 2, 3, 4, the setting mode of the transistor of the generator according to direct current, coil and test 5 of the oscillator circuit, which is sensitive to the sensor element) on the ferrite ring circuit, KOiopoi o gap includes a non-magnetic metal part, an oscillating circuit capacitor 6, capacitors 7 and 8, forming a capacitive divider, blocking capacitor 9, inductance coil 10, forming together with capacitor 8 a contour from which the nanometer is removed. zhsnie positive draw communication frequency generator. The parameters of the circuit formed by IT are inductively And the co-capacitor 8 are chosen in such a way that at the frequency of the generator, its co-motivation has a capacitive character.

The sensor works as follows.

When you turn on the power, the high-frequency oscillator I is excited. When the metal and magnetic parts are in the core gap of the inductor, the oscillatory circuit of the generator, the good quality and inductance of the coil find that the frequency of the high-frequency oscillations on the collector decreases. An increase in the frequency of high-frequency oscillations leads to a decrease in obi, its co-resistance of the circuit formed by the inductor 10 and the capacitor 8 to the rational center:, where, the negative amplitude of the positive feedback CHie decreases, the amplitude of high-frequency oscillations on the collector and a laK decreases Lalee, i.e., a lavii-like process of disrupting high-frequency oscillations occurs: the generator.

Thus, the decrease in the amplitude of oscillations at the collector of the transistor of the high-frequency generator and its origin is only due to a decrease in the quality factor of the circuit, but also due to a decrease in the voltage of the reverse-voltage reversal connection, and its output due to more pesKoiO reduction of the orientation of the secondary circuit formed by the capacitor.

io.1 (; / whale; 1i (L1 oo) ani () ii ev 3 and 1 atu1Pkg) and piductiveness 10, from which the text can be ix) excitation ix4iej) a; ()) a. Choice of m iarametro ioslsdova) slya (l about ksprur ib / iiriii points (hh) pe.choyaisa. M (} zhio peiy.iHvat1 of any sensor of the sensor. Obligantly, then the passage of the part in the gap of the magnetowire can be caused) by the user and} and) by the same negative o6paTiiOii connection to zero. Thus, as a result of the above caiiHOii (} .1 of the episodes of life: there is a combination of Beinujt and a greater number of children of the sensor.

11air of the same high-altitude geisrato1) and expiration of expander II, obtained according to the doubling scheme; And, and usi. You alone cascade them traiz1 With Orpy.m

usi shtelem, working 1m in the class; most powerful mode, with KOTopoio, and removed ihod iaiyr hsiye dalchik.

Ф орм ул а and 3 о б р е e and u

1 spontac1I1, i1 sensor dl l periiCTpa (small metal parts for details.1, content of high-frequency generator). You have 11 traces and 1 st, to the collector of which

iod.lyuchen ko.1Sbate.1Y1y 1 :;). To:) mitter - the point of capacitance is 10 .1. And to the base of the traisistor iodine. Obi-cIon the point of de-stem and resistors is different from ii with TSM, that, for the purpose of ionizing the sensitivity of the sensor, inductance of the inductance into it, one output winding of which and the keys to the first co-sensor e: cost1 01 de,; pgge: 1,: -::))); the densator 1-; from this) th session with fluctuations. ; jnTyro. m, and the other output of the clutch to; the button 11 of the instruction is connected to the input terminal.

And stochi and the book of the Great Britain. irii thousand in viimappa irp expertise

1. Certificate of the USSR AL 204906, cl. O 08C 9/04, 01.20.6G.

2. Copyright svidste; 11) STVO USSR LL 147040, cl. G O6.1 7/00, 01/14/58 (iroto TlHl).

Claims (1)

A non-contact sensor for detecting small metal parts, containing a high-frequency generator made on a transistor, to the collector of which 30 an oscillatory office is connected, to the emitter is a common point of capacitive divide. and a common divider tube with resistors is connected to the base of the transistor, characterized in that, in order to increase the sensor sensitivity of the sensor, an inductor is inserted into it, one winding of which is connected to the first capacitor of the capacitive divider, the second capacitor of which is connected to the oscillating circuit 40, and the other terminal of the winding of the inductor is connected to a power source.