SU1226418A1 - Device for checking parameters of contact gap of electromagnetic relay - Google Patents

Abstract

The invention relates to a measurement technique and can be used to control the parameters of a contact solution (the value of the initial contact gap, the change in the size of the gap when a relay is triggered, etc.) during production and during adjustment work. The aim of the invention is to enhance the functionality of the device by controlling the parameters of the contact solution during their movement. The device contains a light source sequentially placed on its optical axis, an electrical tropic deflector, a diaphragm, a raster screen and a photodetector connected by an output to a registration unit. The inputs of the electro-optical deflector are connected to the second outputs of the control unit connected by the first outputs to the second outputs of the device, and the input to the input of the device, the first output connected to the output of the voltage source. Each of the pair of contacts of the monitored relay is connected respectively to the first output and input of the device, respectively, and the relay coil to the second outputs of the device. The relay contacts are located in the working area of the device between the diaphragm and raster screen so that the plane of movement of the contacts coincides with the scanning plane of the electro-optical deflector when the relay is activated. When power is applied, the light source creates a light beam, which, having passed through an electro-optical deflector, scans according to the level of the control unit signal. The scanning beam of light, passing through the diaphragm and the contacts of the relay, hits the raster screen, which, with its optically open areas, performs a pulsed modulation of the light scanning beam. The pulses of light entering the photodetector are converted into electrical pulses detected by the registration unit. The number of registered pulses determines the contact solution in the static state. When the control unit supplies power to the relay coil, the change in the contact solution over time from the time the voltage is applied to the time the contacts of the monitored relay are closed is determined in the same way. 2 3.p. f-ly, 3 ill. (L

Description

one . one

The invention relates to a measuring technique and can be used to control the parameters of a solution of contacts of electromagnetic relays during their manufacture and during adjustment work.

The purpose of the invention is to expand the functionality of the device by controlling the parameters of the contact solution during their movement.

FIG. 1 shows a diagram of the device; in fig. 2 is a control block diagram; Fig, 3 - timing charts of the device.

The monitoring device contains a light source 1, an electro-optical deflector 2, a control unit 3, a diaphragm 4, a raster screen 5, a photodetector 6 consisting of ground glass 7 and a photosensitive element 8j registration unit 9, a voltage source 10 controlled by electromagnetic relay 1 1 with pins 12 and winding 13, master oscillator 14, electronic key 15, power amplifier 16, reference voltage source 17, comparator 18, AND 19 dual input element with direct and inverse inputs, standby multivibrator 20 and pulse former 21.

As a light source 1, it is advisable to use a gas laser to produce a narrow linearly polarized light beam. The beam scanning is provided by an electro-optical deflector 2, which converts the electrical signal from the control unit 3 and the spatial position of the light beam. The raster screen 5 is made in the form of separate light fibers separated from each other, mechanically connected to the package. The matte glass 7 of the photodetector 6 provides a uniform illumination of the surface of the photosensitive element 8, for example, a photodiode. As a recording unit 9, you can use a printing device, a recorder or a digital indicator.

The device operates as follows.

For monitoring, an electromagnetic relay is installed between the diaphragm 4 and the raster screen S so that the optical device of the device passes between its contacts, and the plane of movement of the contacts is 10

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placed in the scanning plane of the electro-optical deflector 2. When energized, light source 1 generates a light beam. The control unit 3g 1g produces a periodic pulsed electrical signal, a period which is an order of magnitude shorter than the response time of the relay 11 monitored. relay 11. As a result, sequential illumination of the optical fibers of the raster screen 5 5 occurs; one of the end surfaces of which is located near the contacts relay Thus, the passage in the contact solution, the light beam enters through the raster screen 5 and the frosted glass 7 to the photosensitive element 3, which produces electrical and -1 pulses, the number of which corresponds to the number of optical fibers illuminated by the beam. These pulses arrive at block 9 of registration, issuing the results of the control. The limits of the stroke of the light beam is limited by the aperture 4.

From the output of the control unit 3, the voltage of the first pulse is supplied to the front edge of the first pulse through the second output of the device to the winding 13 of the monitored electromagnetic relay 1, which starts to trip, and the contacts 12 start moving. Subsequent pulses of the control unit 3 provide multiple measurement of the contact distance during the operation of the relay in the previously described sequence. When contacts 12 are closed, the load voltage from source 10

 the voltage through the first output of the device is fed to the input of the control unit 3, which stops the supply of an electrical signal to the electroopt: nical deflector 2. The measurement cycle is completed. A change in the intercontact distance during the operation of a relay leads to a change in the number of illuminated fibers of the raster screen 5, which causes a change in the number of pulses produced by the photosensitive element 8.

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and accelerate the contacts of the electromagnetic relay.

The control unit 3 coordinates the operation of parts of the device and operates as follows.

The master oscillator 14 produces a periodic pulsed electric sawtooth signal, which, having passed through the electronic switch 15, is amplified in the power amplifier 16 and is fed to the second output of the control unit 3. At the same time, an electrical signal from the master oscillator 14 is fed to the switch 18, which generates short pulses at the falling front of this signal with a voltage level of the reference voltage source 17. From the output of the comparator 18, the pulses arrive at the direct input of the element I 19, to the inverse input of which from the input of the control unit 3 until the moment when the relay 11 comes off, a zero signal arrives. From the output of element 19, the signal of logic 1 is triggered by a standby multivibrator 20, generating a periodic signal with a period longer than the period of the pulsed electrical signal from the master oscillator 14. This signal is generated in the pulse shaper 2 and is fed to the output of control unit 3. After the relay I1 is triggered from the input of the control unit 3, the electrical signal simultaneously arrives at the electronic key 15, which turns off the master oscillator 14 from the output of the control unit 3, and to the inverse input of the element I 19, at the output of which a logical signal O appears, causing a break pulse with the standby multivibrator 20 and, therefore, termination of the signal at the output of the control unit 3.

The technical and economic effect of the invention lies in the fact that the proposed device allows the determination of

to share the parameters of the contact solution both in the strap and in the progress of the monitored relay,

Claims (3)

1. Device for controlling the parameters of the solution of the contacts of the electromagnetic relay containing the source 10 light optically coupled to a sequentially arranged raster screen and a photodetector connected by an output to a recording unit, characterized in that 15 in order to expand the functionality by controlling the parameters of the contact solution in the process of their movement, an electro-optical deflector, orifice plate, 20 a control unit and a voltage source connected by an output to the first output of a device connected by second outputs to the first outputs of a control unit connected to the input of the device, and the second outputs to the inputs of an electro-optical deflector placed in series with the diaphragm on the optical axis of the device between , a point of light and a raster screen, with the scanning plane of the electro-optical deflector perpendicular to the end surface of the raster screen. 2. The device according to claim i, characterized in that the raster screen is made in the form of a package of optical fibers, with the input ends located in the scanning plane of the electro-optical deflector. 3. The device according to claim 1, about tl and - in that the photodetector is made in the form of successively arranged and mechanically connected ground glass and photo light 40 45 element. element. F “g. / 1st 1st 1t 75 15 U / 7 0V turn Wrong FIG. g Fig.d cpaS Editor E. Papp Compiled by A. Elantsev Tehred I. Veres Proofreader M. Pojo Order 2132/47 Circulation 836 Subscription VNIIPI USSR State Committee for inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab., 4/5 Production and printing company, Uzhgorod, st. Project, 4