SU1569523A1 - Method of centering rotors - Google Patents

Abstract

The invention relates to mechanical engineering, in particular, to methods for centering rotors over couplings. The aim of the invention is to improve the accuracy of measurement and the performance of the centering of the rotors, which is achieved by the fact that in the method of centering the rotors, consisting in measuring the axial and radial locations of their couplings relative to each other when the rotors are rotated 90, 180 and 270 °, determine The results of these measurements and the correction of their position, make two radial measurements at a fixed distance at diametrically opposite points of the coupling of one of the rotors, determine the angular displacement about rothé s, measured by axial movement of the second rotor and applied to amend the radial measurements, the error is determined according to the formula Δ = D (1-COSΑ) / COSΑ ± LTGΑ, where D - diameter of the circle described by the instrumentation point contact with the measuring surface

α - angular displacement of the rotor axes

L - axial movement of the second rotor

Δ is the total correction for angular axial displacement. 2 Il.

Description

This invention relates to mechanical engineering, in particular to methods for centering rotors over couplings.

The aim of the invention is to improve the measurement accuracy and centering performance of the rotors.

FIG. Figure 1 shows the position of the plane of measurement of the radial displacement of the rotors and the error from their angular L y and axial L 0 displacements; in fig. 2 shows the location of the measuring means when centering the rotors.

The centering method is carried out as follows.

On the sleeves of the rotors 1 and 2, the measuring surface 3 and measuring instruments, for example indicators 4 and 5, are fixed at a basic fixed distance from each other to obtain two radial measurements on the rotor coupling 1 at two diametrically opposite points of it A. For measuring the axial movement of the second rotor 2 on it is fixed the same indicator 6.

The method allows to eliminate errors introduced by the angular and axial displacements of the rotors, which increases the

ABOUT

from cn

(CO

alignment by eliminating additional series of measurements and adjustments to the location of the axes.

 The formula for determining the error caused by the angular displacement of the rotors ABC

1 and 2, derived from a triangle

NE

AB tg of Dtg "/

AC AB 4D + - D

D

l I Ј2Јc /.

Itgrf

o

D

1 - cos "/

Cos fit.

± Ugrf,

where 4 is the total correction for the angular and axial displacements of the rotors; D is the diameter of a circle, described by the points of contact of the measuring devices with the measuring surface; o is the angular displacement of the rotor axes;

1 - axial movement of the second rotor with indicators fixed on it. Axial movement of the rotors of machines. Shows unequal effect on the measurement error. The movement of the rotor 1, which is fixed to measure 20

25

The method of centering the rotors, which consists in measuring the axial and radial locations of their couplings relative to each other when synchronized

rotors rotate 90

180

thirty

and 270, according to the measurement results, the relative position of the rotors is determined and their position is corrected, characterized in that, in order to improve the measurement accuracy and the centering performance, two radial measurements are taken at fixed distances in diametrically opposite points the couplings of one of the rotors, determine the angular displacement of the axes of the rotors, measure the axial displacement of the second rotor and correct for the secondary plane (of reference), parallel measurements, determine the error

five

0

Heavy duty instruments are attached to the first rotor coupling.

Since, when measuring the alignment using two radial measurements, the accuracy of measuring the angular displacement of the axes can be checked when the rotors are rotated in the diametrically opposite position with a sufficiently high accuracy and does not depend on the axial movement of the rotors, the correction to the radial measurements makes it possible to more accurately determine the mutual location of cars.

Claims (1)

Invention Formula The method of centering the rotors, which consists in measuring the axial and radial location of their couplings relative to each other when the rotors are rotated 90 180 and 270, based on the measurement results, the relative position of the rotors is determined and their position is corrected, characterized in that, in order to improve the measurement accuracy and centering performance, two radial measurements are taken at fixed distances at diametrically opposite points of the coupling of one of the rotors, op. determine the angular displacement of the rotor axes, measure the axial displacement of the second rotor, and make corrections to the radial measurements, determine the error . four The rotation axis of the rotor 1 "does not affect the measurement accuracy due to plane-parallel movement of reference points, while movement of the rotor 2, on which indicators 4 and 5 are fixed, causes an error & 0 which, depending on the direction of axial movement or increases (or reduces the error caused by angular displacement by an angle). Thus, when centering the unit, in which one of the rotors does not have axial movement, in order to eliminate the influence on the replacement accuracy .5 the moat of the other rotor, measure Formula i . 1 - and - ± itg about where and is the total correction for angular and axial displacements; D is the diameter of the circle described by the points of contact of the measuring devices with the measuring surface; o is the angular displacement of the rotor axes; 1 - axial movement of the second rotor. / } 1