SU1249354A1 - Photoelectric meter of torque - Google Patents

Abstract

The invention relates to a measurement technique and makes it possible to increase the reliability of the meter. When a torque is applied, the elastic shaft 1 is twisted, the light-modulating disks 4 and 5 are displaced relative to each other, the flap teeth open up a number of strokes of the raster gratings 15 proportional to the torque value. Opening part of the raster gratings I5 modulates the light source incident on the photodetector 9 from the light source 7 through the diaphragm 6, light impulses are received on the photoreceiver 9, the number of which is equal to the number of opened strokes. The apertures 16 are constantly open and the photodetector 10 is briefly illuminated through them. Amplifiers-formers 11 and 18 form rectangular voltage pulses of the photodetector photocurrent pulses with the parameters necessary for the normal operation of the device nodes. The light pulses are converted by the photoreceiver 9 into electrical ones, normalized by the amplifier driver 11, and counted by the counter 13, from which information on the number of opened strokes, i.e. about torque. 3 il. ) (L with to with (SP

Description

one

The invention relates to a measurement technique and can be used when measuring torques on shafts.

The aim of the invention is to improve the reliability of the meter by simplifying the design.

FIG. 1 shows a functional diagram of a photoelectric meter

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connected to the installation input of the counter 13, and the second to the synchronizing 1CIM input of the memory register, and the input of the amplifier former 18 is connected to the photoreceiver 10.

A photoelectric torque meter operates as follows.

 Light modulators 4 and 5

fS

20

thirty

torque; in fig. 2 and FIG. 3-10 are set in the initial position

in such a way that the flap teeth 17 of the light-modulating disk 5 overlap the raster gratings 15 on the light-modulating disk 4. Therefore, when the unloaded elastic shaft 1 rotates, the light from the source 7 does not fall on the photodetector 9,

When a torque is applied, the elastic shaft i twists, the light-modulating disks 4 and 5 are displaced relative to each other,

teeth flap 7 open a number of raster strokes

gratings 15 of the light-modulating disk 25, proportional to the torque value. When the elastic shaft 1 rotates, the part of the raster gratings 15 that is open modulates the light source transmitted to the photodetector 9 from the light source 7, and through the radial slit diaphragm-6 to the photoreceiver 9 light pulses are received, the number of which is equal to the number of transparent lines of the raster lattice 15. The holes 16 are constantly open. A photodetector 10 is periodically briefly illuminated through them. Amplifiers-formers 11 and 18 form rectangular voltage pulses with parameters (amplitude, steepness of fronts) necessary for normal operation of the device nodes out of the photocurrent photocurrent pulses. The light pulses from the open areas of the raster gratings 15 are converted by the photoreceiver 9 into electrical ones, normalized by the amplifier-shaper 11 and counted by counter 13. After the passage of the raster grid 15 in front of the photoreceiver 9, a photodetector 10 is illuminated briefly through the constantly open holes 16. - the imaging unit 8 is supplied to the structure of the light-module of the ground disks.

The photoelectric torque meter contains an elastic shaft 1, at the ends of which with the help of si pans 1 and 3, there are installed modulator disks 4 and 5, radial slit diaphragm 6, sources 7 and 8 of light, photodetectors 9 and 10, drivers

11 and 12 pulses, counter 13 and memory register 14.

In this case, the light-modulating disk 4 is made with measuring raster grids 15 having an angular size h and consisting of alternating transparent and opaque radial lines. The raster grids 15 are evenly spaced around a circle of radius R with an angular step h, and on a radius R of the same disk there are 16 holes, the number of which is equal to the number of raster grids 15. The light-modulating disk 5 is made with flap teeth 17 also having an angular size v. The angular pitch between adjacent teeth-flaps 17 of the light-modulating disk 5) is V,.

Sources 7 and 8 of light are installed from the side of the light-modulating module 5, and photodetectors 9 and 10 are installed from the side of the light-modulating disk 4, respectively, on radii R and R, j. A radial slit diaphragm 6 is installed between the light-modulating disk 4 and the photoreceiver 9. The shaper 11 pulses are made in the form of an amplifier-shaper, the input of which is connected to the photoreceiver 9, and the output is connected with the counting input of the counter 13, the output of which is connected to the information input of the register 14 memory Shaper

12 pulses performed after 35

40

45

50

19 synch pulses, for the expander 18 and the former 19 strokes, which are generated by one sync pulse. Moreover, one output pulse with a shift in time. The first is the output pulse,

shaper 19 clock pulses

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connected to the installation input of the counter 13, and the second to the synchronizing 1CIM input of the memory register, and the input of the amplifier former 18 is connected to the photoreceiver 10.

A photoelectric torque meter operates as follows.

 Light modulators 4 and 5

connected to the synchronization input of the memory register 1A, in which information from the counter 13 will be rewritten about the number of opened strokes of the raster grid 15, i.e. about torque. At the second output of the driver 19 sync pulses, the pulse is delayed. This pulse arrives at the installation input of the counter 13 after overwriting the information in the memory register 14 and erases the information recorded in the counter 13, preparing it for counting pulses from the next raster grid 15 during rotation. Information from the register 14 memory can be fed to the digital block display or on the device for collecting and processing information, for example on a computer.

The number of raster grids 15 placed on the light-modular disk 4 is equal to:

- Since,, then the maximum number of raster grids 15 that can be placed on the disk is determined by growing

N i-

vMout V

For one revolution, regardless of the frequency of rotation, of the elastic shaft 1, the torque will be measured N times, which allows us to estimate the rapid changes, the fluctuation of the moment within one revolution.

Claims (1)

Invention Formula A photoelectric torque meter containing an elastic 49354 shaft, at the ends of which there are installed modulator disks, on one circle of which alternating transparent and opaque 5 sections are made, with the angular width of the opaque sections of the first module of the torped disk equal to the angular width of the corresponding transparent sections of the second light modulator disk, on which transparent windows are made , the number of which is equal to the number of transparent areas and which are located on a circle whose radius is different from the radius of the circle of the prose} 5 crayfish areas, two impulse former cos, counter, register memory two photo pair, each of to, toryh includes a light source and a photodetector, disposed on opposite There are 20 photopairs on the circumference of the transparent sections and its photodetector is connected to the counting input of the counter through one pulse shaper, and another photo pair is installed on the circumference of the transparent windows and connected to the installation input of the counter and to the synchronization input of the memory register, whose information input is connected to the output of the counter, characterized in that, in order to increase reliability by simplifying the struction, it introduced a radial slit diaphragm, mounted between the light detector and the second photo pair audio svetomodu- l Thorn disk whose transparent portions vtolneny as radial35 40 raster grids. 1S sixteen 15 FIG. 2 f. j Editor P. Tsitsika Compiled by A. Amakhanov Tehred n.Bonkalo Corrector E. Sirohman ,, . Order 4225/41. Circulation 778 Subscription VNIIPI USSR State Committee for inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab., 4/5 Production and printing company, Uzhgorod, Proektna St., 4