FI57471C - VALS MED REGLERBAR NEDBOEJNING - Google Patents

Description

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Patent- och registerstyreisen '' Arabian uttagd och uti. »Krift« i public · ™! 30.0U.80 (32) (33) (31) Requested stuolksu »—Begird prlorltvt (71) A. Ahlström Osakeyhtiö, Norrmarkku, Finland-Finland (FI) ^ (72) Pertti Lauri Metso, Karhula, Finland-Finland (FI) ) (5 * 0 Deflection-adjustable roll - Vais med reglerhar nedböjning The present invention relates to a deflection-adjustable roll, in particular one consisting of an inner shaft and a roll shell connected to the inner shaft at or near its center, and in which the roll shell is partially or completely deflected by external loading of the roll. canceled by adjustable support forces acting on the ends of the roll shell.

An example of such a roll is the structure according to Finnish patent application 1669/69. Support forces can be provided in such a roll, for example by utilizing eccentric mechanisms or hydraulic loading members. Previously used hydraulic loading members have several sealing points between moving and fixed parts where friction and oil leaks occur. In both solutions, it is difficult to change the direction of the support force during use.

2 57471

Deflection-adjustable rollers are used, for example, as press rolls in a paper machine and as support rollers in slitters. Especially in the latter application # where the speed of rotation of the rollers is large and variable, harmful vibrations are often generated in the previously known structures. In addition, it would be advantageous to adjust the direction of the support force as the paper roll increases.

The object of the present invention is to provide a deflection-adjustable roll in which the direction and magnitude of the support force acting at the end of the roll shell can be easily changed and which is not susceptible to vibration. The support forces are generated by load members arranged at the ends of the roll shell.

The invention is characterized in that the support force is provided by means of balls arranged in at least three radially bores of the load member arranged at regular angular intervals, which are affected by an adjustable fluid pressure and which are in contact with fixed support structures of the roll or non-rotating parts connected thereto.

The invention will now be described in more detail with reference to the accompanying drawings, in which Figure 1 shows a cross-section of a device according to the invention, Figure 2 shows a section of Figure 1 along line AA, Figure 3 shows a detail of the device, Figure 4 shows a cross-section of another embodiment and Figure 5 shows a cross-section of Figure 4 along.

The roll shown in Figure 1 consists of an outer roll shell 1, which is connected to the rotating inner shaft 2, for example, as shown in Finnish patent publication 50 002, at or near its center. The inner shaft consists of a tube 3, an end 4 and an axle pin 5. Attached to the roller shell is an end 7 provided with a cantilever ring 6 to which the inner ring of the rolling bearing 8 is fitted. The outer ring of the rolling bearing is located inside the pressure ring 9 of the loading member, which has a plurality of radial bottom boreholes 10 in an even distribution. Balls 11 are fitted in the boreholes. In addition, it has a valve 19 which allows oil to flow freely into the oil space under the balls, but restricts the flow of oil in the opposite direction. A support ring 20 is arranged on the outside of the balls, which is fixed to a bearing bracket 21 with a bearing 22 on which the shaft pin 5 of the inner shaft 2 is mounted. The pressure ring 9 is connected to the bearing bracket 21 by means of a resilient tube 23 as shown in Fig. 3. j i

The clearance between the balls 11 and the boreholes 10 is chosen so that the balls can easily move in the holes, but the oil leakage is as small as possible. Leakage oil is removed through hole 24 and line 25.

When supplying pressurized oil to the spaces under the balls, the balls act as pistons and provide radial forces between the support ring 20 and the cantilever ring. If the balls are equally large and spaced at equal intervals on the circumference of the pressure ring 9 and the pressure ring 9 and the support ring 20 are concentric, then the resultant of the forces is zero when all the balls i are subjected to the same pressure. If the pressures acting on the balls are adjusted differently, a force is produced which tends to move the pressure ring relative to the support ring, i.e. a bending force acting on the roll shell is produced. Thus, a bending moment acting on the roll shell in the desired direction and magnitude can be obtained, by means of which the deflection of the roll shell due to the external load of the roll can be reduced or reversed.

If the roller shell tends to vibrate, the ball and the oil system behind it act as a shock absorber, because when the ball is pushed in, the oil under it leaves it through the throttling point in the valve 19. Since there is also a ball on the opposite side of the pressure ring, which works in the same way, effective vibration damping in all directions is achieved.

4 57471 The force generated by the oil pressure is transmitted to the roll shell through the bearing 8. The rotation of the pressure ring is prevented by the member shown in Fig. 3 or in another way.

In the embodiment shown in Figure 4, the inner shaft tube 26 of the roll is rotatably mounted on bearings 28 fitted to its ends 27. The roll shell 29 connected to the inner shaft at or near its center is mounted on bearings 31 fitted to its ends 20. The bearing ring 33 acting as a bearing inner ring is surrounded by a load ring 32 , into which radial holes 34 have been drilled, in which the balls 35 can move. The oil space 36 under the balls is connected to a source of compressed oil through bore holes 37 and 38. The rotational movement of the support ring is prevented in a manner not described in more detail here. The inner shaft is supported by a bearing 28 on a pressure pin 33 fixed to the support bracket 39.

The embodiment shown in Figure 4 operates in a substantially similar manner to the previously shown embodiment. It is suitable for use on rollers that do not need to be connected to their own drive, such as paper machine paper and felt guide rollers.

Piston balls are balls for ball bearings and are thus readily available at a reasonable price. Because they only come in contact with parts that do not rotate and virtually do not move, they do not wear out. The support force is transmitted to the rotating parts via rolling bearings which are lubricated with a leaking oil.

In order to achieve the desired vibration damping and to allow a change in the direction of the force, the pressure member must have at least three radial bores arranged at approximately even angular intervals, to which a ball movable by means of pressure is arranged.

Pressure is maintained under all the balls to provide the desired damping in all directions. This also ensures that the balls are lubricated. Oil with a relatively high viscosity can be used to reduce leakage.

Claims (11)

1. A roll with adjustable deflection comprising a rotatably mounted inner shaft and an outer tubular roll sheath, which is attached to the inner shaft in its center or near the middle and where the deflection of the roll sheath can be completely or partially eliminated by supporting forces generated at the ends of the roll sheath, characterized in that the supporting forces are provided by balls (11, 35) arranged in at least three radial bores (10, 34) lying at equal angles from each other in the loading means (9 , 11, 33, 35) and on which an adjustable fluid pressure acts and which are in contact with the stationary support structure (20) of the roller or with non-rotating parts (32) connected thereto. Roll according to claim 1, characterized in that the support ring (20), on which the balls (11) of the load means (9, 11) act, is concentric with the inner shaft (2). Roll according to claim 1, characterized in that the support ring (32), on which the balls (35) of the load means (33, 35) act, is concentric with the roll sheath (1).