SU1693556A1 - Device for reproducing parameters of member rotation - Google Patents

Abstract

The invention relates to a measurement technique and can be used to reproduce rotation parameters. The aim of the invention is to improve the accuracy. At the same time, rotate the exemplary ring gas laser 4 and the exemplary angular measure 5 with the help of the rotor 2. In this case the turntable 8 is rotated with the part 6 and the measuring ring laser 7 mounted on it and the readings of the position indicator 11 of the table are taken. The position of each mark of an exemplary measure relative to the optical axes of the zero indicator 10 of the position of the base 1 and the rotary table 8 is determined. The readings of the measuring and exemplary ring gas lasers are calibrated according to the indications of the null indicators of the base and the rotary table optically coupled to the angular measure 5. Defined The rotation angle, angular velocity, and angular acceleration of the part 6 are based on the calibrated readings of two ring gas lasers and two null indicators using a micro-computer 18. Zil. WITH

Description

The invention relates to measurement technology and optical instrument making and can be used for precision reproduction of rotation parameters of parts.

The purpose of the invention is to improve accuracy.

FIG. 1 shows a block diagram of the proposed device; in fig. 2 is its simplified optical design; in fig. 3 - time diagrams.

The device comprises a base 1, a rotating rotor 2, a rotor drive 3, a sample ring gas laser (KGL) 4 forming an angular measure 5, a part 6, a measuring KGL 7, a rotary table 8, a rotary table actuator 9, a base zero indicator 10 ( position indicator), null indicator 11 of the rotary table, position sensor 12, unit 13 of the life support system, unit 14 of the preliminary information processing system, interface (interface) 15 KGL, interfaces 16 and 17 of zero indicator and position sensors, micro-computer 18, rotor drives 19, interface 20 and 9 of the turntable. Blocks 14-20 together form a measuring unit.

The device works as follows.

The CGL 4 rotates simultaneously with an exemplary angular measure 5, mounted on the rotor 2 relative to the base 1. The rotation is set by the actuator 3, for example, at a speed of 120 rpm. Take readings from a model KGL 4 proportional to the angle

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rotation of the exemplary KGL 4 with a pulmonary base 1. The life support system unit 13 provides for the generation of the exemplary KGL, stabilizing the signal amplitude and generation frequency according to the maximum gain. In block 14 of the information preprocessing system, the number of pulses from the reference KG / 1 is calculated, which is proportional to the angle of rotation of the reference KGL relative to the base of the interface 15, and then transmitted to the microcomputer. The null indicator 10 of the base is read, which is, for example, an autocollimator with a photoelectric output. The zero indicator 10 of the base emits pulses from each mark of an exemplary angular measure 5, for which a sample angular prism is chosen. The time interval T between these pulses is proportional to the angle between each face of the model prism. These readings are then transmitted through the interface 16 to the microcomputer 18. Based on the indications of the exemplary KGL 4 and the null indicator 10, the angles between the faces of the exemplary prism are determined by the traditional method. Then, to increase the level of the measurement, calibrate the readings of the basic KGL 4 according to the indications of the null indicator 10 of the base. All angles between the faces of the exemplary techniques 5 are known with an error of no more than 0.03, which is obtained in advance by repeated measurements of reference angular settings. . Further, with the highest accuracy, the angles between the faces of the prism prism are calibrated using a micro-computer 18, showing sample KGL 4Mkgl (see Fig. 3) with a frequency equal to the product of the number of revolutions 1 from the model prism and its i rayey Then install the part 6, the measuring CHL 7 and rotate on the turntable 8 using the drive 9, electrically controlled via the interface 20 using a microcomputer 18. Next, take the readings from the turntable 11 of the turntable 8. proportional to the angle between each face of the model prism 5, was aware of the indications of the zero indicator of the base 10. The sector of precision measurements of the angle between the optical axes of the null indicator 10 of the osnach and the null indicator 11 of the turntable is determined using position sensors 12 of the first face of the model prism 5 (see flash 2). Next, recalculate the calibrated readings of the model KGL 4 and null indicators 10 and 11 to the angle of rotation of the part b relative to the base 1 as follows (see Fig. 2 and 3).

The zero indicator 10 is pulsed according to the timing diagram for Uio with a frequency of v,

,(one)

where n is the number of revolutions of the rotor 2 in 1; N is the number of faces of the prism 5, C of the model KGL L removes Mobr pulses proportional to the angle of rotation р of the rotor 2 in inertial space, and subtract the angle of rotation of the Earth. Then, the indications of exemplary KGL 4 Mobr are calibrated both for the period G of rotation (see Fig. 3) by the nominal Mobr value of 2 l K 2 106 typ., Where K is the scale factor, and

the DTN / U time of the face change of the model prism 5 (the angle between the faces is already known with high accuracy). From the zero-indicator 11 of the turntable remove the pulses according to the timing diagram

and c. The microcomputer is then filled with time gaps for Uio and He with U4 pulses. Moreover, the difference in the time intervals of the like edges (see Fig. 3) is proportional to the angle a between the optic axes of the zero-indicators of the base 10 and the turntable 11

a- 2l: lMobr / Mobr, (2)

where ACh arr is the number and l pulses of an exemplary KGL 4 taken for a long time, corresponding to bypassing one of the faces of the exemplary prism from the optical axis n / l: t of the base 10 to the optical whose zero1-indicator 11 of the turntable, (27T ). (3)

Ј The OV systems, that the part is rigidly fixed on the pivot foot with the null indicator 11, and the null indicator 10 is rigidly fixed on the base, the angle between their optical axes corresponds to the angle between / at the base mark of the base and the base mark of the base and the base mark of the rotary the table. Thus, a precise measurement (with a level of accuracy higher than 0.2) of the angle of rotation 6 of the part relative to the basis of 1 is achieved. This sequence of operations provides a precise measurement of the angles of rotation of the part. However, the frequency of polling information about the angle at low angular velocities is possible: and the details do not exceed the value of n N, i.e. it has an order of not more than 64 Hz when using a 32-sided prism. With an increase in the speed of rotation of the part 6 in from etching the rotation of the rotor 2 to a value from the “measurable another / g with another hour of the VK survey

N can be reduced to zero in accordance with the expression

VK (G-1-Pdet) N. (4)

where Pobr - the number of revolutions in 1 with exemplary

angular measure;

Pedet - the number of revolutions in 1 per part;

N is the number of marks of an exemplary angular measure.

Therefore, in order to measure the angles of rotation of the part at speeds greater than the angular velocity of rotation of the rotor, it is necessary to change the sign of the angular velocity of rotation of the rotor. In this case, the frequency of the survey in accordance with the expression (4) will double. A further increase in the angular velocity of the part b will lead to a further increase in the survey frequency. The sign of the angular velocity of rotation of the rotor 2 is controlled by a microcomputer 18, an interface 19 and a drive 3 of the rotor. Information about the sign of rotation of the reference KGL 4 is allocated in block 14 of the preliminary information processing system and transmitted via the interface 15 to the microcomputer 18. The sign of rotation of the rotor 2 is changed as the angular velocity of the part 6 approaches the angular velocity of the rotor 2. The increase in the interrogation frequency to about 20 kHz and more are needed to build on the basis of the proposed set of features digital digital systems for automatic adjustment and control of the angular positions of the part. The simplest way is to increase the n-number of the rotor turns and the N-number of marks of the exemplary angular measure. However, an increase in n is possible only by lowering the sensitivity of the model KGL 4. The speed of 2 rev / s is chosen because the electronic path of the model KGL 4 will not miss the frequency more than 2 MHz.

An increase in n with a reduction in the upper frequency of the path is possible only with a decrease in the sensitivity level of the model CHL 4, which leads to a decrease in the level of measurement accuracy, the conflicting goals of the inventions. The increase in the number of marks of the exemplary measure 5 is also limited by the scope for certification of the angular measure with an accuracy of the order of 0.01 + 0.03. On today

The highest level of accuracy is obtained at the State benchmark, which is a 24-sided prism. Thus, increasing the frequency of farrowing

expanding the dynamics of control of the part without entering the measuring KGL 7, installed together with the part 6 on the turntable 8, can lead to a decrease in the level of accuracy of control of the part. Simultaneous use of an exemplary 4 and measuring 7 CGL, as well as the subsequent calibration of their readings, allows simultaneously increasing the accuracy level of reproducing the parameters of the part's rotation.

and significantly expand the dynamic capabilities of systems.

Claims (1)

The invention of the device for playback of steam meters of rotation of the part, containing the base, rotor, rotor drive, gas measuring ring laser, base position indicator, information processing unit, position sensors and measuring unit, characterized in that, in order to increase accuracy, it further comprises a turntable, a position indicator of the turntable, a turntable drive, an exemplary ring a gas laser and an exemplary angular measure, with the part mounted on the turntable, indicators of the position of the turntable and the base optically aligned with the exemplary angular measure, exemplary an annular gas laser and a sample angle are mounted on the rotor, and a measuring annular gas laser on a turntable, the outputs of position indicators, position sensors, measuring and exemplary ring lasers are connected to the information inputs of the measuring unit, the control output of which is connected to the input of the rotary table actuator whose output is connected to input drive rotor. ten eleven eight FIG. 2 v