Method for determining the misalignment in the horizontal plane of elongated parts of a machine, such as cylinders and rollers, and an optical reflection instrument suitable for use with this method.

摘要

Method for determining from optical measurement a measure of the misalignment, i.e. the deviation in the horizontal plane between the actual and the desired position of a rotatable elongated part (9) of a machine (1). Use is made of an imaginary vertical reference plane ( SIGMA ) lying at a distance from the machine (1). Said reference plane ( SIGMA ) is determined by two base points (3, 4) which set up an imaginary base line ( GAMMA ) at an angle ( mu ) relative to the longitudinal axis (L) of the machine (1), and by an optically reflecting device (5) disposed such that any cross-section thereof with a horizontal plane is a straight line at right angles to the imaginary reference plane ( SIGMA ). With an optical or electro-optical measuring instrument (7) equipped for angle measurement, and a further optically reflecting device (10) being placed on said machine part (9), the angle ( phi ) between the line of sight (Z) of the measuring instrument (7) and an arbitrary imaginary line ( OMEGA ) forming an angle ( sigma ) with the imaginary reference plane ( SIGMA ) being measured. With said measured angle ( phi ) the misalignment of said machine part (9) can be determined. The invention also provides an optical reflecting device (10) for placing on a machine part (9) to be measured.