FI94651C - Clutch construction between press rolls forming long nips - Google Patents

Description

94651

Coupling structure between long nip press rolls Kopplingskonstruktion mellan pressvalsar som bildar länga nyp 5

The invention relates to a coupling structure between long nip press rolls.

The forces between the long nip press rolls cause their own problem area. When bolted joints are used, points of discontinuity are formed in the structure between the rollers, whereby the stresses in the external frame structures become critical factors in the design of the structure. The mutual determination of the position of the rollers has also not been sufficiently reliable in the known solutions. Locking the structures together has required unreasonable hydraulic forces. In addition, dismantling the structures has not been straightforward 15 and has required considerable maintenance time. This application discloses a completely new type of coupling structure between bearing housings of long nip press rolls. According to the invention, a locking ring comprising a central opening is used in the coupling structures. According to the invention, both the upper bearing housing and the lower bearing housing are fitted in the central opening of the locking ring. The above-mentioned bearing housings comprise guide surfaces 20 which cooperate with the corresponding guide surfaces of the locking ring opening. When locking the bearing housings relative to the locking ring, they are pressed by a separate wedge part by means of a hydraulic cylinder against the surface above and below the opening of the locking ring: against the surface.

With the solution according to the invention, the position between the rollers can be precisely determined. In addition, the locking ring comprises side projections which, if necessary, replace the snacks between the body parts of the paper machine. The side projections effectively transmit forces and moments to the frame when using a separate wedge section. The hydraulic force required to implement the lock is small. The coupling structure 30 between the long nip press rolls according to the invention is mainly characterized in that there is a locking ring between the rollers at each end of the rolls, which locking ring comprises a central opening into which the upper roll bearing housing and the lower roll bearing housing are fitted. adapted to move the wedge piece, the wedge piece being adapted to act on at least one of the bearing housings, wherein by moving the wedge piece with the actuator, the bearing housings are brought into a locking position relative to each other, the bearing housings being locked relative to the locking ring.

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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 1A schematically shows a long nip press apparatus of a paper machine.

Fig. 1B shows a long nip press apparatus according to the prior art as seen from the machine direction.

Figure 2A shows a side-by-side coupling structure between long nip press rolls according to the invention.

Figure 2B shows a long nip press structure of a paper machine with a side protrusion of the locking ring as a snack between the upper body Rt and the lower body R2.

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Figure 2C shows the step of threading the lower roll felt through the free spaces between the body portions and the base.

Figure 2D shows the threading of the felt of the upper roll through the free spaces 25 between the body parts, which free spaces are formed by removing the snacks and supporting the bodies from the edge spreading beams.

Figure 2E shows a press structure according to the invention. I denotes a long nip press apparatus and II denotes another long nip press apparatus formed using a locking ring between rollers according to the invention.

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Figure 3 shows the coupling structure according to the invention axonometrically.

Figure 4 shows the removal of the locking ring by means of a winch device.

Fig. 5 shows another embodiment of the invention, in which the wedge part is arranged to be located in the lower part of the locking ring between the locking ring and the wedge surface below the lower bearing housing.

Figure 1A shows the long nip press apparatus of a paper machine. In the press apparatus 10 shown in Fig. 1, a web W is fed to a nip N between the lower long nip press roll 11 and the heated counter roll 10 between the felt H and the roll surface 10 'of the counter roll 10.

Fig. 1B shows the rollers 10 and 11 of Fig. 1A seen from the machine direction and provided with a connection of the bearing housings of the rollers 10,11 according to the prior art. The long 15 nips between the rollers 10 and 11 are shown in the figure by reference arrow N. The felt H and the web W are guided through the nip N. The roll 10 is a heated counter roll and the roll 11 is a long nip press roll comprising loading means 120a1, 120a2 ..., in which the loading means 120aj, 120a2 ..., preferably cylinder means, in the central shaft 130 are adapted to act by force on the loading or sliding shoe 120b and the flexible closed slide. 20 pan F into the web W to remove water from the web. By web W in this invention is meant a paper or board web. The lower long nip press roll 11 comprises ♦ a flexible closed conveyor belt F adapted to run along the surface of the loading shoe, i.e. the slipper 120b, the oil medium being introduced into the space between the slipper 120b and the closed conveyor belt F as a lubricating medium. The counter roll 10 is preferably a roll heated by an internal heating medium, e.g. water, steam or oil, or externally, e.g. by induction or infrared. The counter roll 10 may also be a non-heated roll.

Figure 2A shows a separate view of the main parts of the coupling structure 30 according to the invention. The upper roller 10 and the lower roller 11 are connected to each other from their bearing housings 12,13 by means of a locking ring 14 at both ends of the rollers. The locking ring 14 comprises a central rectangular opening 15 in Fig. • · 4 94651, in which the upper bearing housing 12 and the lower bearing housing 13 are fitted. The upper bearing housing 12 comprises an upper guide surface d1 and side guide surfaces d2, d3, which co-operate with the respective surfaces M1, M2, M3 of the central opening 15 of the locking ring. In addition, the upper bearing housing comprises a wedge surface d4 inclined with respect to the lower horizontal axis 5 (X axis), which cooperates with the inclined surface Nj of the separate wedge part 17.

Correspondingly, the lower bearing housing 13 comprises side guide surfaces d2 ', d3' and a lower guide surface dj 'cooperating with the respective surfaces M2, M3, M4 10 of the central opening 15 of the locking ring. In addition, the lower bearing housing 13 also comprises an upper inclined wedge surface d41 cooperating with the wedge surface N2 of the wedge part 17.

The wedge part 17 is thus adapted to come into contact with the inclined wedge surface d4 below the upper bearing housing 12 from its upper surface Ντ. Correspondingly, the lower bearing housing 13 comprises an upper inclined surface d4 '15 (with respect to the horizontal plane x), which cooperates with the lower wedge surface N2 of the wedge part 17.

As shown in Figure 2A, there is an actuator 18, preferably a hydraulic cylinder device, adapted to move the wedge part 17. The hydraulic cylinder body 18b is located inside the beam structure of the locking ring 20 14. The arm 18a engages the wedge part 17. The wedge part comprises wedge surfaces Nj, N2 which are oblique to the horizontal plane and co-operate with the end surfaces d4, d4 'of the various bearing housings associated with them. When the wedge part 17 is moved in the direction Lj, the upper bearing housing and the lower bearing housing are moved apart from each other so as to abut the upper surface Mj and the lower surface M4 of the central opening 15 of the locking ring 14. Thus, all clearances are removed and the bearing housings 12,13 are kept locked relative to the locking ring 14. This further determines the exact relative position of the upper roll 10 and the lower roll 11. In addition, the forces are directed to the intact circumferential structure 14 because there are no bolted joints that would weaken the structure. In addition, the locking ring 14 comprises side projections 16at 16a2, which, if necessary, replace the spacers between the body parts R1, R2 of the paper machine. The hydraulic force required for locking is reasonable. The circumference 14 is removed by means of a winch 100 or other overhead lifting device, after which the rollers 10,11 »· <5 94651 are released for felt replacement. The locking ring 14 comprises beam portions 14a1,14a2,14a3,14a4 which are perpendicular to each other. The side projections 163 ^ 1682 protrude from the beams 14a2 and 14a4. The opening 15 is formed in the middle of the beams 148 ^ 1482,14a3,14a4.

Fig. 2B shows a press structure of a paper machine according to the invention, in which the side projections 163 ^ 1632- of the locking ring 14 are provided as a spacer between the upper body R1 and the lower body R2.

Figure 2C shows the step in which the locking ring has been removed and the snacks between the frames R15R2 have been removed. The upper bearing housing is placed on the wires of the upper winch assembly 100. The figure shows the replacement of the lower roll felt H.

Figure 2D shows the replacement of the upper roll felt H. The snacks between the frames have been removed and the frames have been supported by a cantilever arrangement. According to the invention, the locking ring 14 acts as snacks on its side projections 16a], 16a2 and thus when the locking ring is removed, the space between the frames R15R2 is released for threading the felt.

Figure 2E shows a press structure according to the invention, in which the press consists of two successive long nip press sets comprising locking rings 14 according to the invention. The first set of long nip press sets is marked 1:11 and the second II.

Figure 3 shows the coupling structure according to the invention axonometrically. The support ring 14 can be removed with the aid of the outlet bar P support. The forces are transmitted to the body 25 of the paper machine through the projections of the locking ring. The support reaction forces F1, F2 caused by the operating moments of the roll become small.

Figure 4 shows the removal of the locking ring 14 by means of a winch device 100, whereby the track 10,11 is released for maintenance work, e.g. for changing the felt.

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Fig. 5 shows an embodiment of the invention in which the wedge part 17 is arranged in the lower part of the locking ring below the central opening 15 of the locking ring 14 between the wedge surface dj 'below the lower bearing housing 13 and the surface M4 below the central opening 15 of the locking ring. The upper surface N f of the wedge part 17 is inclined with respect to the horizontal plane 5 and likewise the wedge surface dj 'cooperating with the wedge part 17 below the bearing housing 13. The surface M2 is a horizontal surface as well as the lower surface N2 of the wedge part. The wedge pieces T1, T2 guide the bearing housings 13 and 12 to a precise position relative to each other and to the locking body 14.

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II

Claims (8)

A coupling structure between long nip press rolls (10, 11), wherein the long nip press apparatus comprises loading means 12 (^, 12032 ... 1203 ^) associated with the non-rotating central shaft (130) 5 of the long nip press roll (11) for pressing the loading or sliding shoe (120b). to the counter roll (10) and that the long nip press roll (11) comprises a closed flexible conveyor belt jacket (F) adapted to conform to the shape of the counter roll (10) at the load shoe (120b) in the pressing situation and that both the felt (H) and the paper are passed through the nip area. or a paperboard web (W), characterized in that there is a locking ring (14) between the rollers (10, 11) at each end of the rolls, which locking ring (14) comprises a central opening (IS) into which the bearing housing (12) of the upper roll (10) and the bearing housing (13) of the lower roll (11) is fitted and that there is an actuator (18) adapted to move the wedge piece (17), which wedge piece (17) is adapted to act on at least one of the bearing housings (12 and / or 13), whereby by moving the wedge piece (17) 15 with the actuator (18) the bearing housings (12, 13) are brought into a locking position relative to each other, the bearing housings (12, 13) being locked in the locking ring (14) in relation to. Coupling structure according to Claim 1, characterized in that the wedge piece (17) is arranged between the bearing housings (12, 13) and that the bearing housings (12, 13) are guided by the side surfaces (M2, M3) of the opening (15) of the locking ring (14) and that the end surfaces (D4, D4 ') of the bearing housings (12, 13) are against the wedge surfaces (N 1 N 2) of the wedge piece (17). Coupling structure according to Claim 1, characterized in that the wedge piece (17) is located between the end surface (D4 ') of the bearing housing (13) and the end surface (M4) of the opening (15) of the locking ring (14). Coupling structure according to one of the preceding claims, characterized in that side projections projecting from the locking ring (14) are arranged between the upper body part (Rj) and the lower part 30 (R2) of the machine body as snacks. 94651 8 Coupling structure according to the preceding claim, characterized in that the locking ring (14) is fastened to the machine frame (R 1, R 2) by means of screw means from its side projections (16a, 16a2). Coupling structure according to one of the preceding claims, characterized in that the actuator (18) is a cylinder device, most preferably a hydraulic cylinder. Coupling structure according to the preceding claim, characterized in that the body part (18b) of the actuator (18), preferably the cylinder body, is arranged inside the locking body 10 (14) and the arm part (18a) of the actuator, preferably the hydraulic cylinder, is arranged to engage the wedge piece (17). ) comprising at least one horizontally inclined surface (N1 and / or N2) engaging the counter-wedge surface of the bearing housing. 7 94651 Coupling structure according to one of the preceding claims, characterized in that when the coupling between the rollers (11, 12) is removed, the locking ring (14) is adapted to be detachable from the body parts (R1, R2) and movable by means of a winch or other similar actuator (100). sideways. n • * 9 94651