Roller mill for grinding particulate material

Abstract

A roller mill (1 ) for grinding particulate material such as cement raw materials, cement clinker and similar materials, said roller mill (1) comprising a substantially horizontal grinding table (3) and a set of rollers revolving about a vertical shaft (5); said set of rollers comprising a number of rollers (4) rotating about respective roller shafts (6) which are connected to the vertical shaft (5) via a hinged connection (7) which comprises a bearing shell (14) and a bearing journal (15) resting therein, said hinged connection (7) allowing a free arcuate movement of the roller (4) in an upward and downward direction in a plane including the centreline (12) of the roller shaft; and said set of rollers (4) being configured for interactive operation with the grinding table (3); characterized in that the bearing shell (14) of the hinged connection (7) has a diameter which exceeds that of the bearing journal (15) resting therein by a factor of at least 1 percent.

Description

Technical field [0001] The present invention relates to a roller mill for grinding granular materials such as cement raw meal, cement clinker blocks, and similar materials. The roller mill includes a substantially horizontal grinding table and a set of capable of rotating around a vertical axis. A roller, the set of rollers includes a plurality of rollers rotating around separate roller shafts connected to a vertical shaft via a hinge connection, the hinge connection including a bearing housing and a bearing shaft resting therein The neck and the hinge connection allow the rollers to make free circular movement in the upward and downward directions in a plane including the centerline of the roller shaft, and the rollers of the set are configured to cooperate with the milling table. Background technique [0002] The roller mill mentioned above is well known. In the known roller mill, the hinge joint connecting the roller shaft and the vertical shaft is typically composed of a con...

AI Technical Summary

Problems solved by technology

When such known roller mills are used for grinding granular materials such as cement raw meal, cement clinker and similar materials, the hinge joints will be subjected to relatively high pressures which cause the hinge joint parts to Friction between the bearings, which will cause harmful heat generation, which cannot be easily obtained by Lubricant and reduce

Of the other commercially available bearing types that may be mentioned, hydrodynamic plain bearings cannot be used because the bearing journal is not continuously rotating and therefore cannot establish a hydrodynamic lubrication film; hydrostatic radial bearings are a technically important An ideal bearing solution, which ensures full contact whether in stationary operation or when undergoing rotation, is too complex, sensitive and expensive; while rolling bearings will prevent the journal from pumping lubricant into the load due to small tilting movements area, so it is not suitable for

Therefore, it was concluded that there is no conventional commercial bearing type that has the characteristics required to handle the above loading conditions without significant disadvantages

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