SU1585678A1 - Apparatus for measuring and checking correct geometric forms of elongated polyhedral objects - Google Patents

Abstract

This invention relates to instrumentation technology. The aim of the invention is to improve the performance of monitoring due to the simultaneous monitoring of the object parameters in a symmetrical three-coordinate system at all coordinates in a single positioning. The laser radiation 1, reflected from the scanning unit 2, enters the lens 3, which converts the angular scan to a linear one. Having reflected from mirrors 4 and 5, the radiation flux is divided into two streams. The system of three streams formed in this way (direct from the lens 3 and two reflected), deployed in one plane relative to each other at an angle β = 120 °, corresponds to the system of three coordinates. An object placed in the intersection zone of the flows is sufficient to position once, for example, for the hexagon object 26, by ensuring the parallelism of its opposite faces of the axis of one of the flows. In this case, the position and the double apothem of object 26 are determined by the corresponding pulses from the light pulses and the shadow pulses simultaneously, and the control of the correctness of its geometric shapes is carried out by comparing the measurement results for each of the coordinates. The corresponding processing of information pulses is carried out by the time selection unit 11 and the six measuring channels 19 1, ..., 19 6. Thus, the control is carried out simultaneously in three coordinates with a single pre-positioning, and this results in an increase in the productivity of the control. 3 il.

Description

The invention relates to the field of instrumentation technology and can be used in the production of stranded rigid light guides and other long products, the cross section of which has the shape of a regular hexagon or triangle,

The purpose of the invention is to increase the productivity of the control due to the simultaneous control over all coordinates of the object parameters in a flat, symmetric three-coordinate system with a single positioning.

FIG. 1 is a block diagram of the device; FIG. 2 shows the time i diagrams of information pulses; Fig. 3 shows timing diagrams explaining the operation of the device.

The device contains a laser 1, dispersed along its radiation path, a scanning unit 2, made in the form of a multifaceted mirror mounted for rotation with a given frequency, an objective 3, two mirrors 4 and 5, set at an angle

o (60 each to the optical axis of the lens 3 symmetrically relative to it, mounted along the radiation fluxes reflected by mirrors 4 and 5, focusing lenses 6 and 7 and photoreceivers 8 and 9, amplifier 10, the input of which is connected to the outputs of photodetectors 8 and 9, block 11 time selection consisting of an inverter 12,

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one-shot 13, four D-flip-flops 14-17 and six three-input elements I 18 - ISjs with the input of the inverter 12, the input of one-shot 13, the counting input of the third D-trigger 16 and the third inputs of the fifth and sixth elements I and 18 are connected to the output of the amplifier 10, the R input of each of the D-flip-flops 14-17 is connected to the output of a single-vibrator 13J, the counting input of the first D-flip-flop 14 is connected to the output of the inverter 12, the counting input of the second D-flip-flop 15 and the second input of the sixth element And 18 are connected to the my output of the first D-flip-flop 14, the counting input of the fourth D-flip-flop 17 and the second inputs the first, third and fourth elements And 18, 183 and 18, connected to the direct output of the third D-flip-flop, 165 the first, second and third inputs of the fifth element And 18 are combined and connected to the direct output of the fourth-th D-flip-flop 17, the first the inputs of the first and second elements And 18, and 18 are connected to the direct output of the second D-flip-flop 15, the first inputs of the third, fourth and sixth elements And 18j, B and 18jj are connected to the inverse output of the second D-flip-flop 15, the third inputs of the first, second and the third elements And 18 ,, 18 and 48 C are connected to the output of the inverter 12, the second input of the second element And 18 is connected to the inverse output of the third D-flip-flop 18j ,. and the inverse output of each of

D-flip-flops 14-17 are connected to its D input, six measuring channels 19, - 19j, each of which consists of a series-connected element 20. a filling, a counter 21 and a buffer register 22., a clock frequency generator 23 whose output is connected to the first inputs of elements

20.

 fill all six measuring channels

, 19 ,, second

the inputs of which are connected respectively to the outputs of the six elements And 18-18, and the first and second delay elements 24 and 25 connected in series, the input of the first delay element 24 connected to the output of the amplifier 10, the counting inputs of the buffer registers 22 to 22j of all six measuring channels 19 , - 19 are combined and connected to the output of the first delay element 24, and the R inputs of the counters 21 to 21, all six measuring channels 19 to 19 are combined and connected to the output of the second delay element 25.

The device works as follows.

The laser radiation 1 hits the multifaceted rotating mirror of the scanning unit 2, reflects from its edges, undergoes an angular scan, and enters the objective 3, which creates an image of a point source (laser 1) in the measurement zone and converts the scan from angular to linear. The radiation flux emitted from lens 3, reflected from mirrors 4 and 5, undergoes reflection, being divided into two streams, which are deployed relative to each other at an angle of 120 °. The object 26 is placed in the intersection zone of the radiation fluxes (direct from lens 3 and reflected from mirrors 4 and 5) in such a way that its longitudinal axis is perpendicular to the axis of all three streams, and positioned, for example, so that the opposite edges volume & 26 (assuming that object 26, for example, is a hexahedron) were parallel to the axis of the radiation flux.

Thus, a system is formed of three radiation streams deployed in the same plane relative to each other at an angle of 120 °, in which the parameters of the object 26 are measured (in this case).

ten

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b) double hexagon apothem - cross section) in three coordinates X, Y and Z corresponding to shadow pulses from the object 26 and pulses of illumination in the forward flow and flows reflected from mirrors 4 and 5. Divided by mirrors 4 and 5, the radiation flux falls on the focusing lenses 6 and 7, which collect it on the photodetectors B and 9, generating information signals arriving at the input of the amplifier 10.

The information signals from the output of amplifier 10 are the flash pulse and shadow pulses (Fig. 2). In the absence of object 26, the signal is a flash pulse (Fig. 2a), the duration of which is equal to t scan time. If there is an object 26 in the scan zone, shadow pulses appear on the illumination pulse (Fig. 2b), the duration of which (f, 5 2 - e is determined by the frequency of rotation of the polyhedral mirror of the scanning unit 2, the focal length of the objective 3). the time of passage of the laser beam through the object 26, i.e. proportional to the size of the object 26. Time 4 (Fig. 2b) between the initial edge of the light pulse and the initial front of the first shadow pulse carries information about the position of the object along the Y coordinate, so part of the information to them pulse is obtained from the intersection of the object reflected from the mirror 26 the light flux 4, respectively shadow pulse duration C carries information about the double apothem object 26 in the coordinate Y. The time

, 5 (Fig. 2b) between the last front of the light pulse and the second fügünt of the third shadow pulse carries information about the position of the object 26 along the Z coordinate, since this part of the information pulse is obtained from the intersection of the object 26 by the light flux reflected by the mirror 5, accordingly, a shadow pulse of duration carries information about the double apo

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The object's subject 26 is in the Z coordinate. A shadow pulse with a duration of 1. carries information about a double apothem in the X coordinate, a pulse in the position of the object 26 in the X coordinate, received from the intersection of the direct light flux with it.

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The only limitation in the operation of the device is the impossibility of measuring the parameters of the object when it is located at the a point of the junction of mirrors 4 to 5 (Fig, 1). In this case, the measurement occurs only along one coordinate X, and the time selection unit 11 increases information. ,

 Amplified information signals from amplifier 10 (Fig. 3a) are received in block 1G of the time selection, highlighting impulses, inconsistent information on the X, Y, and Z coordinates (Fig. 3m, -Zo and Zp) and the diameter in X. Y coordinates and Z (fig, zn, sn, 3c). At the output of the inverter 12, the signal has the form shown in FIG. 3B, on the direct outputs of the D-flip-flops 14-17, signals are generated, respectively.

20

in fig. Зе, Зк, Зг ,, ЗЗ, and on the reverse output of D-flip-flops 14-17 - signals / Ф shown respectively in FIG, Zju 3l5 ZDe Zi, Signal; from the one-shot 13 (fig. Sv) j duration 25 is longer than light pulse, used to zero out D-riggers | 4--17,

The signals from the block 11 temporary hops - and they arrive in the corresponding iz-zeritelnye channels 19 - 19; displacements in X (19,5-) displacements in Y (194) of the placements in Z (19), double: apothems

chi in the other i gr ct si me yj pr

NI RIS ST OP PR WITH WHICH IS GIVEN TO NOT GO TO D SPECIAL WE ARE A LITTLE POLY AND A M ELIMINATIVE INSULATIONS

on coordinate X (

double apothem at the Y coordinate (19 |) 5 double apothem at the Z coordinate () at the input of the element 20. filling, where the clock frequency is filled with the generator rods 23 (FIG. 3t. Counter 21. counts the number of pulses proportional to the measured parameters of the object 26 The output skg of the counter 21. in a parallel code enters the information inputs of the buffer register 22 |, the information is recorded in the buffer register 22. performed on the leading edge of the pulse generated by the first delay element 24 (FIG, d), and the counter is reset 2.1. happens n After recording information in the buffer register 22. a short pulse generated by the second delay element 25 () The duration of the pulse generated by the first delay element 24 (Fig.Su) must be greater than the duration of the pulse produced by the single vibrator -13 (Fig. Sv) 5 tampering D-flip-flops 14-17.

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The output information from the buffer register 22. may be fed to

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external, with respect to the considered, the display device, the control of the measurement of the object being measured, to a digital-to-analogue converter, and so on.

Thus, the device provides a measurement of the position of an object in a three-coordinate symmetric flat system (along the axes X, Y, Z) and monitoring the correctness of the geometric shapes of the lengths of hexagons and trihedrons at once by the three coordinates X, Y, Z in the specified system by the criterion of equality measurement parameters by coordinates X, Yj Z, which ensures improved control performance.

rmula of invention

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A device for measuring the position and verifying the correctness of the geometric forms of long polyhedral objects; containing an optically coupled laser, a scanning unit, an optical unit with a lens, a photographic receiver, a time selection unit containing an inverter, a single vibrator, four B-flip-flops connected according to the division into two, and four three-input elements And, while the input the inverter, the one-shot input and the counting input of the third D-flip-flop are connected to the photodetector's outputs, the R-input of each of the D-flip-flops is connected to the one-vibrator output, the counting input of the first D-flip-flop is connected to the output of the inverter, the counting input of the second D-trigger is connected to right m1) 1mthe output of the first D-flip-flop, the counting input of the fourth D-flip-flop is connected to the direct output of the third D-flip-flop, four of identical measuring channels, each of which consists of a series-connected filling element, a counter and a buffer register, a clock frequency generator and two serially connected delay elements, the input of the first of which is connected to the output of the photodetector, and the output connected to the counting inputs of the buffer registers of the four measuring channels, the output of the second delay element connected to the R input m-1 counters of four measuring channels, characterized in that, in order to increase the monitoring performance due to simultaneous monitoring of object parameters in a flat symmetric three-coordinate system with single positioning, the sensor is equipped with a second photodetector, the output of which is combined with the output of the first photodetector , the fifth and sixth measuring channels, identical to the first four, the first inputs of the filling elements of all measuring channels are connected to the output of the clock generator The selection time block contains an additional two three-input elements AND, the outputs of all six elements AND are connected respectively to the second inputs of the filling elements of all measuring channels, the first inputs of the first and second elements AND are connected to the direct output of the second D-flip-flop, and the first inputs the third, fourth and sixth elements And - its inverse output, the second inputs of the first.

The third and fourth elements And are connected to the direct output of the third -; D-flip-flop, and the second input of the second element And - with its inverse output the third inputs of the first, second and third elements And are connected to the output of the inverters, the third inputs of the fourth and sixth elements And connected to the output of the photodetector, the second input of the sixth element I is connected to the direct output of the first D-flip-flop, three inputs of the fifth element And are combined and connected to the direct output of the fourth D-flip-flop, the optical unit is equipped with two mirrors installed along angle

0 60 each to the optical axis of the lens of the block is symmetrical relative to it, and two focusing lenses, installed respectively along the radiation fluxes, reflected by mirrors and optically coupled with the corresponding photodetectors.

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Claims (1)

Claim A device for measuring the position and correctness of the geometric shapes of long-sized multifaceted objects, containing an optically coupled laser, a scanning unit, an optical unit with a lens, a photodetector, a temporary selection unit containing an inverter, a one-shot, four 'D-flip-flops, included in the scheme of division into two, and four three-input elements And, while the inverter input, the input of the one-shot and the counting input of the third D-trigger are connected to the outputs of the photodetector, the R-input of each of the D-triggers is connected to the output of the one-shot, the counting input of the first D-flip-flop is connected to the output of the inverter, the counting input of the second D-flip-flop is connected to the direct output of the first D-flip-flop, the counting input of the fourth D-flip-flop is connected to the direct output of the third D-flip-flop, four identical measuring channels, each of which consists of a series-connected filling element, a counter and a buffer register, a clock generator and two series-connected delay elements, the input of the first of which is connected to the output of the photodetector, and the output is connected to the counting inputs rows of buffer registers four measurement channels, an output of second delay element is connected to the four counters Rvhodami measuring channels, wherein o f e 9'15 with the fact that, in order to increase the monitoring performance due to the simultaneous control of all parameters of the object parametron in a planar symmetric three-coordinate system with single positioning, the otso is equipped with a second photodetector, the output of which is combined with the output of the first photodetector, the fifth and sixth measuring one ' channels identical to the first four, the first inputs of the filling elements of all measuring channels are connected to the output of the clock generator, the selection time block additionally contains two three-input elements And, the outputs of all six elements And are connected respectively to the second inputs of the filling elements of all measuring channels, the first inputs of the first and second elements And are connected to the direct output of the second D-trigger, and the first inputs of the third, fourth and sixth elements And - its inverse 25th output, the second inputs of the first, third and fourth elements And are connected to the direct output of the third; D-flip-flop, and the second input of the second element And - with its inverse output, the third inputs of the first, second and third elements And are dined with the output of inverters, the third inputs of the fourth and sixth elements And are connected to the output of the photodetector, the second · input of the sixth element And is connected to the direct output of the first D-trigger, the three inputs of the fifth element And are combined and connected to the direct output of the fourth D-trigger, optical unit equipped with two mirrors mounted in the direction of radiation at an angle d - 60 ° each to the optical axis of the lens of the unit symmetrically relative to it, and two focusing lenses installed respectively in the direction of radiation flux reflected by Alami and optically conjugated with the respective photodetectors, - -g Gg _{x |} ------ e * * 4 4 8¾ δ FIG. 2