Method and Device for Detecting Straightness Deviations and/or Deformations in a Rotary Kiln

Patent metadata

Field	Value
Publication number	US-2017292788-A1
Application number	US-201715630595-A
Country	US
Kind code	A1
Filing date	Jun 22, 2017
Priority date	Jun 27, 2011
Publication date	Oct 12, 2017
Grant date	—

Abstract

A method for detecting straightness deviations and/deformations in a rotary kiln, the rotary drum of which features bearing rings spaced apart from one another in the axial direction and respectively supported on rollers, the outer surface area of the rotary drum, the bearing rings, involves scanning the rollers and/or the shafts of the rollers in a contactless fashion with the aid of at least one scanning device and obtaining three-dimensional position data regarding the scanned object(s), and evaluating three-dimensional position data with respect to the occurrence of a deviation of (a) the rotary kiln axis from a straight line, (b) the rotary drum from a cylindrical shape and/or (c) the rotational axes of the rollers from a line extending parallel to the rotary kiln axis. A device for detecting straightness deviations and/or deformations in a rotary kiln, at least one scanning device and a rotary kiln so equipped are provided.

First claim

1 . A method for detecting straightness deviations and/or deformations in a rotary kiln, the rotary drum of which features bearing rings that are spaced apart from one another in the axial direction and respectively supported on rollers, the rotary kiln having axial sections ( 11 ) distributed along the length of the rotary kiln, the method comprising
scanning the outer surface area ( 5 ) of the rotary drum ( 4 ), the bearing rings ( 6 ), the rollers ( 7 ) and/or the shafts ( 17 ) of the rollers ( 7 ) in a contactless fashion with the aid of at least one scanning device ( 12 ) such that three-dimensional position data regarding the thus scanned objects, evaluating the three-dimensional position data with respect to the occurrence of a deviation of the rotary kiln axis ( 3 ) from a straight line, a deviation of the rotary drum ( 4 ) from a cylindrical shape and/or a deviation of the rotational axes ( 8 ) of the rollers from a line extending parallel to the rotary kiln axis ( 3 ), and scanning an axial section ( 11 ) of the rotary kiln ( 1 ) with the at least one scanning device ( 12 ) and carrying out such scanning in the plurality of axial sections ( 11 ) distributed along the length of the rotary kiln ( 1 ), wherein such scans also measure one stationary reference point respectively, during said scans, correlating the three-dimensional position data with the respective reference point in order to obtain relative position data, and combining the relative position data of several axial sections ( 11 ) and jointly evaluating same.

2 . The method according to claim 1 , characterized in that the scanning is carried out during the operation of the rotary kiln ( 1 ).

3 . The method according to claim 1 , characterized in that the rotary kiln ( 1 ) comprises a clinker kiln for cement manufacturing or a lime kiln for lime manufacturing.

4 . The method according to claim 1 , characterized in that the rotary kiln ( 1 ) is scanned from both sides.

5 . The method according to claim 1 , characterized in that three-dimensional position data representing points on the circumference of the bearing rings ( 6 ) is obtained during the scanning of the bearing rings ( 6 ), in that a circle is computationally adapted to the points on the circumference of each bearing ring ( 6 ), in that the centre of each circle is determined, in that the kiln axis is computationally obtained as the connection between the centres ( 9 ), in that the kiln axis is compared with a straight line, and in that possible deviations are output.

6 . The method according to claim 1 , characterized in that three-dimensional position data representing surface points is obtained during the scanning of the surface area ( 5 ) of the rotary drum ( 4 ), and in that said three-dimensional position data is linked with rotational angle data that represents the instantaneous rotational angle of the rotary drum ( 4 ) at the time of the scan of the respective surface point.

7 . The method according to claim 6 , characterized in that a three-dimensional model of the rotary drum ( 1 ) is generated from the three-dimensional position data representing the surface points and the respectively assigned rotational angle data.

8 . The method according to claim 7 , characterized in that the three-dimensional model is compared with a cylindrical comparison model, and in that local deviations of the three-dimensional model from the comparison model are indicated.

9 . The method according to claim 1 , characterized in that local deviations of the cross section of the rotary drum ( 4 ) from a circular cross section and deviations of the axis ( 3 ) of the rotary drum ( 4 ) from a straight line are indicated separately of one another.

10 . The method according to claim 1 , characterized in that the scanning of the rollers ( 7 ) includes the scanning of reference objects ( 18 ), particularly reference spheres, that are arranged on both ends of the rotational axes ( 8 ) of the rollers.

11 . The method according to claim 10 , characterized in that the rotational axis ( 8 ) of the rollers ( 7 ) is computationally obtained as the connection between the reference objects ( 18 ), and in that the parallelism of the rotational axis ( 8 ) with the kiln axis is determined and deviations from said parallelism are indicated.

12 . The method according to claim 1 , characterized in that the scanning is carried out by means of 3D laser scanning.

13 . A method for detecting straightness and/or deformations of a rotary kiln having a rotary drum ( 4 ) that features bearing rings ( 6 ) that are spaced apart from one another in an axial direction and having rollers ( 7 ), the bearing rings ( 6 ) respectively supported on the rollers, the rotary kiln having an axis ( 3 ), and the rollers ( 17 ) having their respective rotational axes ( 8 ), comprising scanning an outer surface area ( 5 ) of the rotary drum ( 4 ), the bearing rings ( 6 ), the rollers ( 7 ) and/or the shafts ( 17 ) of the rollers ( 7 ) in a contactless fashion with the aid of at least one scanning device ( 12 ) such that three-dimensional data regarding the thus scanned object(s) is obtained, and evaluating the three-dimensional position data with respect to the occurrence of a deviation of the rotary kiln axis ( 3 ) from a straight line, a deviation of the rotary drum ( 4 ) from a cylindrical shape and/or a deviation of rotational axes ( 8 ) of the rollers from a line extending parallel to the rotary kiln axis ( 3 ).

Assignees

• Holcim Technology Ltd

Inventors

• Stutz Thomas

Classifications

• F27B7/42 Primary

  Arrangement of controlling, monitoring, alarm or like devices · CPC title

• G01B11/2408

  for measuring roundness · CPC title

• F27D21/02

  Observation or illuminating devices · CPC title

• F27D19/00

  Arrangements of controlling devices · CPC title

• G01B11/16

  for measuring the deformation in a solid, e.g. optical strain gauge · CPC title