Vertical roller mill
US4869434A · kind A · utility
14Cited by
7References
2Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Dec 7, 1988 |
| Grant date | Sep 26, 1989 |
| Priority date | — |
| Expiry date | Dec 7, 2008 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB02C2015/002
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
A vertical roller mill has a rotatable grinding table (1) which is fed with material to be ground through a feed pipe (14) so that a cone of material is formed between the bottom of the pipe and the table, and scrapers (25) for intercepting the cone and spreading the material over the table and under grinding rollers. In order to avoid the feed pipe running empty so that the cone is not formed, sensors (21) sense the level of material in the pipe and controlling means (19,20) responsive to the sensors adjust the height of the feed pipe and/or the angle of the scrapers.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.