Bearings – Rotary bearing – Antifriction bearing
Patent
1994-11-08
1995-12-05
Footland, Lenard A.
Bearings
Rotary bearing
Antifriction bearing
384563, 384 99, F16C 1938
Patent
active
054722853
DESCRIPTION:
BRIEF SUMMARY
This invention relates to an apparatus for the refining of fiber material. The apparatus, a so-called disk refiner, comprises two opposed refining disks, at least one of which is rotary and supported on a rotary shaft. In a disk refiner of said type, the shaft is mounted in a stand via a bearing housing comprising at least two bearings, one of which is an axial/radial bearing for carrying axial forces from the refiner disk as well as prevailing radial forces, and one is an axial/radial bearing intended primarily to carry radial forces.
A disk refiner equipped with such a bearing type is disclosed in SE-PS 345 892. The bearing is relatively complicated, because it comprises a bearing housing for the bearings which is axially movable in the refiner stand. The bearing housing there must be extensive in length and include several slide surfaces to be fitted into the stand. The bearings, furthermore, must be axially prestressed in such a way, that at least one bearing must carry radial load and simultaneously must be axially movable in the bearing housing. This compromise renders a complicated and more expensive structure and deteriorates its functional efficiency.
The present invention offers a solution of the aforesaid problems. Due to the bearing housing being fixed in the stand, and the bearings rigidly mounted each in its axially movable bearing seat, and prestressing members arranged between the bearing seats, a simple and operationally reliable structure is obtained. The characterizing features of the invention are apparent from the attached claims.
The invention is described in greater detail in the following, with reference to the accompanying drawings showing different embodiments of the invention.
FIGS. 1 and, respectively, 2 are cross-sections of embodiments comprising two and, respectively, three bearings.
FIGS. 3 and 4 are cross-sections of a detail in FIG. 2 of different designs.
Both embodiments consist of a refiner with a stand 1 and a refiner housing 2, in which two opposed refining disks 3,4 are located. At these embodiments, a first refining disk 3 is rotary, and a second one 4 is stationary. The rotary refining disk 3 is supported on a rotary shaft 5, which is mounted in the stand 1 via a bearing housing 6 and driven by a motor (not shown).
The refining disks 3,4 are provided on their surfaces facing toward each other with refining elements 7,8, which between themselves define a refining gap. The stationary refining disk 4 has a central inlet opening 9, through which the material is fed in which is to be refined during its passage outward through the refining gap.
During the refining operation, a very high pressure is generated in the refining gap, which pressure yields an axial force which has to be carried by the bearing of the shaft. This force can amount to several tens of tons and, therefore, puts very high requirements on the bearing design.
The rotary shaft 5 also is movable so as to allow adjustment of the refining gap between the refining elements 7,8 on the refining disks 3,4.
According to the embodiment shown in FIG. 1, the shaft 5 is supported by two bearings 11,12. The first bearing 11 is an axial/radial bearing intended to carry axial forces from the first refining disk 3. This bearing 11 also shall carry prevailing radial forces, for example the dead weight of the shaft and refining disk. The second bearing 12 is an axial/radial bearing intended primarily to carry radial forces, for example counter forces to the radial forces on the first bearing.
The bearing housing 6 is mounted rigidly in the stand 1. The two bearings 11,12 are attached with their inner ring on the shaft 5 and with their outer ring are fixed in a first and, respectively, second bearing seat 21,22. These bearing seats are axially movable by means of slip fit, but not rotary in the bearing housing 6. In the stationary bearing housing 6, a plurality of first prestressing members 25 are arranged between the two bearing seats 21,22. Each prestressing member 25 preferably is designed as a spring-loaded piston/cyl
REFERENCES:
patent: 2565759 (1951-08-01), Danley et al.
patent: 3304139 (1967-02-01), Toth et al.
patent: 4341426 (1982-07-01), Clapp
patent: 4923313 (1989-05-01), Bergling
patent: 5323972 (1994-06-01), Kjellqvist
Footland Lenard A.
Sunds Defibrator Industries Aktiebolag
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