SU1663396A1 - Precessing shaft radial deflection measuring device - Google Patents

Abstract

The invention relates to a measurement technique and can be used to measure the radial deviations of shafts operating at varying temperatures and their deformations in the radial direction. The purpose of the invention is to increase the information content. The device contains six motion sensors 1-6, connected to six measurement circuits 7-12, which are connected to controllable keys 13-18. The device also contains coincidence circuits 19, 20, subtraction blocks 21, 22, addition block 23, blocks 24, 25, 26 divisions, multiplying blocks 27, 28, and memory block 29. At the output of multiplication unit 27, information about the radial deviation due to shaft precession is obtained, and at the output of multiplication unit 28, information about the changing diameter as a result of shaft deformation. 1 il.

Description

Ui Utz

K Xi

(eight)

(a-DHX) (a + X1-DHHT

The signals from the outputs of the first 21 and second 22 subtraction blocks are fed to the inputs of dividing unit 24, the output of which is equal to

(Ts12-U11) (U 12 -Y 13)

 2 (a-fXi-AXx)

-t (G + xxG)

The signals from the outputs of the first 7 and fifth of the 11 measurement circuits arrive at the inputs of the second dividing unit 25, the output of which is equal to

У13 а + АХх Уц а + Xi-ТО1

(ten)

The signals from the outputs of the first 24 and second 25 blocks of division (9). (10) and memory block 29

() is fed to the inputs of the first multiplication unit 27, at the output of which the signal is equal to

DHXXJL Ch1z (Y12-Up)

2 Uz (Y12-U13)

(and)

The signals from the outputs of the first 7 and second 8 measurement circuits arrive at the inputs of the addition unit 23, at the output of which a signal appears

Y12 + Y11

2 Ka

2-DH2x

(12)

15

0 „v У13

2a-XlyTT

(14)

At this time, the third 15, fourth 16 and sixth 18 controlled keys are closed, and the signals from the third 9, fourth 10 and sixth 12 measurement circuits to subsequent blocks

don't arrive

As the shaft moves further, the keys 13, 14 and 17 close. When the distances from the first 1 and second 2 displacement sensors to the shaft surface become equal, the coincidence circuit 19 operates, opening the keys 15, 16 and 18. Through them, signals from the third 9 and fourth 10 measurement circuits arrive at the inputs of the first subtraction unit 21, at the output of which a signal appears

U22-U21 2 KLH,

a2-hh

(15)

The signals from the outputs of the fourth 10 and sixth 12 measurement circuits are fed to the inputs of the second subtraction unit 22, at the output of which a signal appears

U22 - U23

KXi

-} (a + xi - dhu)

(sixteen)

.Signals (15) and (16) from the outputs of the first 21

and the second 22 subtraction units arrive at the inputs of the first division unit 24, the output of which is equal to

(Y22-U21), (Y 22 -Y 23)

2 (a + Xi - Dhu) HT (a + D Hu)

(17)

The signals from addition unit 23 and second subtraction unit 22 are fed to the inputs of the third division unit 26, the output signal of which is equal to

The signals from the outputs of the third 9 and sixth 12 measurement circuits are fed to the inputs of the second dividing unit 25, at the output of which a signal appears

Y23 (a + DCU

Y21 (a + Xi-dXu) 1

(18)

The signals from the outputs of the first 24 and second 25 dividing units and the signal from memory 29,

equal -ta come in first block 27

the multiplication at the output of which the signal appears

And at X1 Y23 (Y22-U11) urine (U22-Ch23) - 19)

The signals from the outputs of the third 9 and fourth 10 measurement circuits are fed to the inputs of the adding unit 23, at the output of which the signal appears

U22 + U21

2 Ka

; 2-DH

(20)

The signals from addition unit 23 and second subtraction unit 22 are fed to the inputs of the third division unit 26, the output signal of which is equal to

(+ Y21)

(U22 - U23)

 2 (a + Xi-DHu) Xi (a + DHu)

The signals from the outputs of the second 25 and third 26 blocks of division (18), (21) and block 29 of memory Xi are fed to the inputs of the second multiplication unit 28, the output of which is equal to

2d-y, 3 (V22 + U21), 22, 23 X1U21 (U22-U23) (

The value of Xi, which is constant for a given measuring system, is provided fairly easily due to its small value in comparison with the dimensions of the shaft.

The value of DC in accordance with expressions (11) and (19) determines shaft deviations as a result of precession in directions of mutually perpendicular coordinate axes OX and OY, respectively, and does not depend on the change under the influence of influencing factors of coefficients K, instability of parameter a depending on the change in the shape and size of the shaft.

The value 2a is equal to the difference (X0-D) and is obtained at the output of the second multiplication unit 28 when the distance between the opposite sensors is constant, characterizes the shaft diameter D in the measurement process, and its control over time is the change in diameter due to elastic and thermal deformations.

The use of this invention improves the accuracy and informativeness of the measurement of the deviation of precessing rolls subjected to high vibrations and temperature distortions.

Claims (1)

Formula of Invention A device for measuring the radial deflection of a precessing shaft according to the ed. St. No. 1562674, characterized in that, in order to increase the information content, it equipped with a second multiplication unit, a third dividing unit and an addition unit, the first input of which is connected to the outputs of the second and fourth controlled keys, the second input to the outputs of the first and third controllable keys, and the output to the first input of the third division unit, the second input of which is connected to the output of the second subtraction unit, and its output to the first input of the second multiplication unit, the second and third 0 the inputs of which are connected respectively to the outputs of the first division unit and the memory unit, and its output is the second output of the device,