FI89736C - Method of grinding the paper machine's bend-compensated rollers and the paper machine's bending-compensated roll - Google Patents

Description

89736

Method for grinding a paper machine deflection compensated roll and a paper machine deflection compensated roll Förfarande vid avslipningen av pappersmaskins böjningskompenserade Vals 5 och pappersmaskins böjningskompenserade Vals

The invention relates to a method for grinding a deflection-compensated roll 10 of a paper machine and to a deflection-compensated roll of a paper machine.

Grinding of deflection-compensated, i.e. tk rolls, assembled to sufficient tolerances, is a difficult task. The difficulty of grinding is based on the fact that in grinding, the casing is thrown within the bearing clearances. In grinding, the jacket rests through the bearing on the shaft and a few 15 roller rollers act on the contact at the top of the bearing ring. However, the grinding wheel is always on the side. Even a small throw in the outer ring of the bearing ring causes a large throw in the direction of the blade and the casing becomes a throw.

The above-mentioned problem has been proposed to be solved e.g. so as to reduce 20 bearing clearances. However, the above is not possible because larger bearing clearances are required during the operation of the tk rolls to enable the deformations caused by large temperature fluctuations and the operating clearance required by them.

. : However, the clearances required for long-term and reliable roller operation are too large for grinding the roller assembled.

25

According to the invention, the problem is solved in that at least one cover of the deflection-compensated roll is provided with means by means of which the clearance of the bearings can be reduced during grinding. When the roller returns to normal use, the bearing clearances required for driving are restored.

30

According to the invention, the bearing means of the deflection-compensated roll shell are designed so that the bearing roller circumference is adapted to be displaceable in the axial direction of the roll for grinding 8 9 7 36 2. The inner ring of the bearing rollers of the bearing according to the invention is adapted to be displaceable in the axial direction of the roll. The inner rolling surface of the outer ring of the bearing means is curved, whereby by moving the inner ring of the bearing axially in the roll, the bearing rollers are moved closer to the rolling surface of the outer ring 5 from the entire bearing circumference.

Thus, when grinding the tk roll assembled, during the grinding, the radical clearances of the roll shell bearing are minimized by moving the inner ring of the roller bearings of the roll bearings in the axial direction of the roll.

10

The method according to the invention for grinding a paper machine roll is mainly characterized in that the method uses a bearing whose bearing ring is movable in the axial direction of the roll, whereby the radial clearances of the bearing are minimized.

The roll of a paper machine according to the invention is mainly characterized by a screw by means of which the bearing ring, preferably the inner bearing ring, is displaceable in the axial direction of the roll 20 and that the roll comprises a support ring or the like through which the screw is passed, the screw at its end comprising a bearing part adapted to engage the bearing on the end face, whereby the inner ring is pushed by turning the screw so as to load the bearing ring formed by the bearing roll or the like on the inner ring.

25

The invention will now be described with reference to some preferred embodiments of the invention shown in the figures of the accompanying drawings, to which, however, the invention is not intended to be exclusively limited.

Figure 1 shows the grinding arrangement of a deflection compensated roll of a paper machine with the roll assembled.

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Figure 2 illustrates the problems encountered in the grinder arrangement of Figure 1.

Figure 3 shows a deflection-compensated roll according to the invention, in the grinding 5 of which the method according to the invention is used to minimize bearing clearances during grinding.

Figure 4A shows the bearing means of the roll shell of the roll according to the invention, which are provided with a device for moving the inner circumference of the bearing rollers.

10

Figure 4B shows another preferred embodiment of the adjustable bearing means of the roll according to the invention.

Figure 1 shows the grinding arrangement 15 of a deflection-compensated roll according to the invention with the roll in place in its application in a paper mill. Grinding of the roll 10 is performed with a tool, preferably a grinding wheel 12 on the side of the roll 10.

Figure 2 illustrates the problems encountered in grinding the roll shell. The shell 10a of the roll 10 is mounted for rotation on bearing means 11. The bearing means 11 20 comprises as an outer outer ring 11a of the bearing 11, bearing rollers 1 lbj, 1 lb2.1 lb3___ and an inner ring 11c of the bearing. The grinding stone 12 is in contact with the rotated bearing shell 10a on the side of the roll 10. In the grinding of Fig. 1, the roller 10 rests on two, at most three: the upper roller 1 lb1, 1 lb2.1 lb3. When the casting error D of the outer ring 11a occurs .... · (arrow S t) at the bearing bearings llbj, llb2 and 1 lb3, is caused on the roll shell 10a. 25 strong oscillating movement (S2) with bearing clearances E enabling said erroneous movement.

The dotted movement and the input of the throw point D for the bearing rollers are shown in dotted lines. Thus, when the throw D comes at the bearing rollers 11b1, 11b2, 11b3, Γ: the entire grinding roll shell 10a oscillates with respect to the grinding wheel 12, which further causes an error in the grinding result of the bearing shell 10a.

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Figure 3 shows a roll 10 of a deflection compensated paper machine. As shown in the figure, the roll 10 comprises a roll shell 10a which is rotated on bearing means 11,15. The inner ring 11c of the bearing 11 is around the inner central axis 13 of the stationary non-rotated roll, and the outer flange 11a rotates with the roll shell 10a. Between the roll shell 5 10a and the inner central shaft 13, the loading means are preferably load pistons 14a1, 14a2, 14a3 ... by means of which the deflection of the roll shell 10a is compensated. As shown in the figure, the roll shell 10a is mounted for rotation by bearing means 11 and 15. In addition, there are support bearings 16 and 17 for the central axis 13 of the roll 10.

As shown in the figure, the bearing 11 comprises between the outer ring 11a and the inner ring 11c two bearing roller rings K, and K2, of which the ring K, comprises bearing rollers 1 lbj, 1 lb2.1 lb3___ and a circumference K2 bearing rollers lld ,, lld2 ... the inner ring 11c of the bearing means 11 rolling surfaces 18 and 19 inclined in different directions with respect to the central axis X (Fig. 4A). According to the invention, the inner ring 11c is adapted to be movable in the direction of the central axis X of the roll 15 either in the direction L, or in the direction L1. When the inner ring 11c of the bearing 11 is moved in the direction L, the bearing means 11bj, 11b2, 11b3 ... of the bearing ring K are moved axially so that the bearing means 11b, 11b2, 11b3, 11b3 ... move toward . Since the inner rolling surface 11a of the bearing outer edge 11a has a curved cross-section, the bearing means K, bearing means 11b, 11b2, 11b3 ... move relative to the rolling surface 11a of the outer ring 11a of the bearing 11. The bearing rollers 11b ,, 11b2, 11b3 ... move towards the rolling surface 11a, the edge areas C ,, where the bearing rollers 11b ,, 11b2 ... come closer to the inner rolling surface 11a of the outer ring 11a. As a result, the bearing clearances are reduced.

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When the inner ring 11c is moved in the opposite direction L1, the bearing circumference K2 of the bearing means is moved by its bearing rollers lld ,, lld2, lld3 ... so as to move relative to the rolling surface 11a of the outer ring 11a of the bearing 11 and move to the edge area of the rolling surface 11a. the bearing on the circumference K2 in contact with the rolling pin 30 nan, or at least their distance from the rolling surface 11a, decreases. Thus, Fig. 5 p 9 /.:. In the embodiment t 3, either the bearing ring K or the bearing ring K2 can be loaded depending on the axial direction in which the inner ring 11e of the bearing 11 is moved.

In the embodiment of the invention shown in Fig. 3, the bearing of the roll shell 11a is performed from one end of the roll shell by conventional bearing means 15 and by means of clearance-adjustable bearing means 11 according to the invention from the other end of the roll shell. Thus, the removal of the bearing clearances for grinding can be performed only by means of the bearing means 11, and the bearing clearances are removed only during the grinding of the roll shell. When the grinding is completed, the normal bearing clearances required by the press drive 10 are returned to the bearing means 11.

Figure 4A shows a first preferred embodiment of the radial clearance adjustment of the bearing means according to the invention. As shown in Fig. 4A, the tk roll bearing 11 comprises bearing rings Kt and K2, each ring K1 and K2 comprising a plurality of bearing rollers 11bI, 11b2 ...; lldI, lld2 ... According to the invention, the inner ring 11c of the bearing 11 is movable in the figure by arrow L ]. By turning the screw R, the inner ring 11c of the bearing is moved in the direction Lt. In this case, the bearing rollers of the bearing ring Kj are loaded 1 lbla 1 lb2.1 lb3 ___ (described by the force arrow F).

The screw R is adapted to rotate in the thread 21 of the support ring 20. The screw R comprises at its end a stop portion 22 which engages the end face of the inner ring 11c of the bearings 11.

Y - By turning the screw R, the inner ring 11c is pushed in the direction Lj. The movement in the opposite direction takes place by utilizing the weight of the shell 10a of the roll 10 and turning the screw R .... in the opposite direction.

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Fig. 4B shows another preferred embodiment of the actuating device of the inner ring 11a of the bearing 11 provided with two bearing roller rings K1 and K2. In the embodiment of the figure, the screw R is arranged to rotate against the support ring 23 of the central shaft 14 of the roll 10. The screw R is fitted through the thread 25 of the sleeve 24 below the inner ring 11c and 30 is fixed to the fixed support ring 23. By turning the screw R, the part 24 is pushed relative to the part 23. In rotating the screw, R, the sleeve is moved in the direction of the arrow 24 and by bearing R λ July 9 June 6th line of the ring 11 of the bearing load on the bearing rollers K2 IDj 1, 1 ld2-- moves in the axial direction of the roll and bearing rollers 1 LDJ, 1 ld2-- · moving the outer ring of the bearing 11, the curved inner rolling surface 11a, along towards the edge regions C, of the surface 11a. Then in the edge areas C | when the rolling surfaces of the bearing rings 11a, 11c are closer to each other, the bearing clearances E and the bearing rollers lld1, lld2 ... of the bearing ring K2 are loaded (force arrows F). Thus, the surface shape of the rolling rings of the bearing rings is utilized in adjusting the clearances. The bearing clearances are changed by moving the bearing ring in the axial direction of the roll (direction X), whereby the position of the bearing rollers of the bearing ring changes with respect to its other rolling surface. The edge regions C1, C2 of the rolling surface 11a, 10 of the outer ring 11a are closer to the axis of rotation X of the roll than the central regions of the rolling surface 11a, and thus when moving bearings towards the edge region C, or C2 Fig. 4B shows the displacement of the bearing ring 11e in the direction L?

The clearances of the second bearing 15 of the roll 10 are also removed, because the sheath 10a also transmits the displacement provided by the screw R to the other end. At one end, the inner ring of the bearing 15 is axially locked.

Claims (6)

39736 Claims A method for grinding a roll of a paper machine roll, in particular a deflection compensated roll (10), in which the roll is ground assembled and the radial bearing clearances (E) of the bearing (11) of the rotated roll shell (10a) are minimized during grinding, and that after grinding returning the bearing clearances (E) to normal, characterized in that the method uses a bearing whose bearing ring (11c) is movable in the axial direction of the roll (direction X), whereby the bearing rollers of the bearing ring (K ^ K ^) move with the moved bearing ring (11c) 10 (11b |, 11b2, llb3 ...; lldj, lld2,11 ^ 3- ··)> wherein the bearing rollers move relative to the outer ring (11a) of the bearing (11), the shape of the rolling surface (11aj) being such that the bearing circumference the bearing rollers are loaded and the radial clearances of the bearing (11) are minimized. Method according to the preceding claim, characterized in that the method 15 uses a radially adjustable bearing whose outer surface (11a) of the outer ring (11a) is closer to the central axis (X) of the roll than the central area (X) of the roll than to the central region of the rolling surface (11aj). Method according to one of the preceding claims, characterized in that in the method the bearing ring (11a) is moved from the bearing ring (11a) by means of a screw device (R) by turning the screw (R). A deflection-compensated roll (10) of a paper machine, the roll (10) comprising a roll shell (10a) and an inner central shaft (13) of the roll shell (10a) and loading means, preferably 25 load pistons (14aj, 14a2 ...) a central shaft (13) and a roll shell (10a) between the inner surface, the loading means (14a, 14a2 ...) providing the desired shape of deflection on the roll shell (10a) and compensating for the deflection due to the own weight of the roll shell (10a), which paper machine roll comprises bearings (11,15) , on which the roll shell (10a) is rotatable, and in which at least one of the bearings (11, 15) of the roll shell 30 (10a) is adapted to be adjustable from the radial play (E) of the bearing rollers, whereby the roll (10a) of the roll shell (10a) for 39736, the radial bearing clearances (E) of the bearing (11) are minimized by loading the bearing circumference (KjjKy bearing rollers (1 lblT 1 lb2 - ..; 1 Id !, 1 ld2-- ·) substantially the entire circumference (KjjK ^ m by moving the bearing ring (11c) in the axial direction (X) of the roll, the roll structure comprising means (R) by which the bearing ring (11c) is displaceable to minimize radial clearances of the bearing 5 (11) and the bearing (11) comprises an inner ring (11c) and an outer ring (11a) between at least one bearing ring (Κ ^ ϊ ^) forming the bearing rollers (1 lb1 (1 lb2 ...; lldi, lld2 ···)), characterized in that there is a screw (R) by means of which the bearing ring, preferably the inner bearing ring (11c) is displaceable in the axial direction (X) of the roll (10) and that the roll comprises a support ring (20) or the like through which a screw (R) is passed, which screw comprises at its end a stop part (22) adapted to engage the bearing (11) ) to the end face of the inner ring (11c), whereby the inner ring (11c) is pushed by turning the screw (R) so as to load the bearing ring (K ^ F ^) formed on the bearing ring or the like on the inner ring (11c). Roll according to Claim 4, characterized in that the outer ring (11a) of the bearing (11) comprises an inner rolling surface (11aj) for the bearing rollers, the surface (11a) of which has a shape such that the edge regions (C 1; C 2) are closer to the roll (11). 10) the central axis (X) as the central regions of the surface, and that the surface is preferably curved. 20 Roll according to Claim 4 or 5, characterized in that there is a sleeve (24) or the like under the inner ring (11c) of the bearing (11), which comprises a thread (25) on the screw (R), the screw (R) being inserted into the sleeve ( 24) and connected to a fixed axial but rotating position relative to the support ring (23), the screw (R) having a sleeve (24) and an inner ring (11c) of the bearing (11) displaceable in the axial direction of the roller to minimize radial play. -9736