公开(公告)号：EP1981654A1

公开(公告)日：2008-10-22

申请号：EP07700130.3

申请日：2007-01-29

申请人： Bühler AG

发明人： OURIEV, Boris ,  SCHLIEN, Oliver ,  HOEHENER, Manuel ,  SCHÖNENBERGER, Niklaus ,  GEISSBÜHLER, Roger

IPC分类号： B07B1/42 ,  B07B1/44 ,  G01N15/02

CPC分类号： B07B1/42 ,  B07B1/44 ,  B07B13/16

摘要： The invention relates to a screening device (1) for a pulverulent or granular material, in particular a control screen for milled products such as flour, middlings or semolina. The device has an inlet (2) for material to be screened, an outlet (3) for rejections and an outlet (4) for undersize. Furthermore, the screening device comprises a screen frame (5) with a screen (5a) fastened thereto and a base framework (8). The screen frame (5) is mounted such that it can move relative to the base framework (8) of the screening device (1) and is coupled to a vibrating source (7) by means of which the screen frame (5) can be made to move with vibrating movements relative to the base framework (8) of the screening device. During operation, the screen frame (5) can be made to move with vibrating movements whose frequency is in the range from 15 Hz to 100 Hz and whose amplitude is in the range from 0.1 mm to 6 mm.

公开(公告)号：EP1920223A1

公开(公告)日：2008-05-14

申请号：EP06741658.6

申请日：2006-06-20

申请人： Bühler AG

发明人： KUHN, Andreas ,  HOEHENER, Manuel

IPC分类号： G01H1/00

CPC分类号： G01H1/003

摘要： The inventive method for monitoring the operating state of rotating rollers in an industrial installation, which contains one or more rotating rollers, comprises the following steps: a) recording, in the form of a time-variable electrical signal, the vibrations, which are generated by the roller when in operation, during a predetermined time interval during operation; b) determining the instantaneous frequency spectrum of the time-variable electrical signal for the predetermined time interval; c) comparing the determined frequency spectrum with a reference frequency spectrum provided beforehand, which corresponds to a defined operating state of the rotating roller, and determining an instantaneous difference between the instantaneous frequency spectrum and the reference instantaneous frequency spectrum, and; d) initiating a measure if the difference between the spectra, which is determined in step c), is greater than a permitted limit difference between the spectra.