Flsmidth A/s

Sören Hanghöj

Rasmus Thranberg Nissen

Anders Fougner

Morten Olsen

A roller mill () for grinding particulate material such as cement raw materials, cement clinker, coal and similar materials, said roller mill () comprising a substantially horizontal grinding table () and a set of rollers revolving about a vertical shaft ();

Roller mill for grinding particulate material

Described is a rolling bearing () for a rocker arm, said rolling bearing comprising an at least partly circular outer part (), an at least partly circular inner part () and a number of rolling elements () which are fitted between the outer part () and the inner part (). The rolling bearing is peculiar in that at least one of the rolling elements () comprises two opposite, curved side faces (), which viewed in at least one cross-sectional constitutes arc lengths of the same imaginary circle (), and which constitutes contact faces for the outer and the inner circular part () respectively, and at least one side surface (), which lies within the mentioned imaginary circle (). It is hereby obtained that the number of rolling elements in the bearing can be increased, thereby reducing the load on each single rolling element subject to the same total load rate, thereby increasing the total load bearing capacity of the bearing. This is due to the fact that at least a part of the roller face of the traditional circular rollers which do not get into contact with the outer or inner part of the bearing through small reciprocating angular rotations is omitted thereby significantly reducing the space taken up by each of the rolling elements in the circumferential direction of the bearing.

Rolling bearing

Described is a roller mill () for grinding particulate material, such as cement raw materials, cement clinker and similar materials, said roller mill comprising a substantially horizontal grinding table (), at least one therewith interactively operating roller () which is configured for rotation about a roller shaft () through the use of a bearing () for the roller, and a closed circulation system for lubricant for lubricating the bearing () for the roller, said circulation system comprising a reservoir (), ducts () for feeding of lubricant to the bearing () for the roller and ducts () for recirculating the lubricant from the bearing () for the roller. The roller mill further comprises an autogenously regulated pressure pump means () which is driven by the rotation of the roller (), and has a first part () which is mounted on the roller shaft () and a second part () which is mounted on the roller () and rotates therewith. During the operation of the mill the pump means delivers a significant pressure contribution for recirculating the lubricant to the reservoir, and has a capacity which is proportional to the rotational speed of the roller and hence the lubricant requirement.

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Köpenhamn Ö, Denmark

Sören Hanghöj