FI97484C - Clutch construction between the bearing housings in a low pressure press - Google Patents

Description

97484 5

Coupling structure between bearing housings in a long nip press Koppiingskonstruktion roellan lagerhusen i en längnyppress

The invention relates to a coupling structure between bearing housings in a long nip press.

10 The nip of the long nip rolls consists of a pair of Sym-ZL and Sym-Belt rollers. A special feature of the nip is the high line pressure. The maximum line pressure is up to 1200 kN / M. A normal screw connection is then not possible, because 130 screws per roll are required to overcome the line pressure when it is desired to follow the principle: the internal force 15 of the connection is greater than the load opening the connection.

This application discloses a new type of support between the bearing housings of a long nip press, in which separate drawbars are used to connect the bearing housings. In a preferred embodiment of the invention, the drawbar at both ends of the drawbar preferably comprises conical surfaces which engage a mating surface with a corresponding shape of the bearing housings but with a different wedge angle. In the solution, the snack is recyclable about an axis associated with its central region. In the solution, the shaft comprises a separate hydraulic actuator or only a screw-25 device with which the wedge connection can be opened and closed. The rotary shaft further comprises a nut which provides the final coupling force between the coupling surface of the drawbars and the coupling surface of the bearing housing. The coupling surfaces are thus located relative to the longitudinal axis of the drawbar so that only traction is applied to the drawbar in the coupling.

In the invention, the opening and closing movement of the drawbars takes place mainly transversely to the machine direction. In this case, no space is taken • in the machine direction, which is often an obstacle to such a drawbar operation.

In another preferred embodiment of the invention, the suspension shaft of the drawbars is located in the second bearing housing, the wedge means for connecting the bearing housings preferably being located only at the other end of the drawbar. However, an embodiment 2 97484 is also possible in which the pivot shaft end of the drawbar comprises wedge means by which the bearing housings can be connected together.

The support-5 between the bearing housings of a long nip press according to the invention is characterized by what is stated in the claims.

Figure 1B schematically shows a long nip press according to the prior art.

Figure 1B shows a long nip roll according to the prior art in a cross-sectional view.

Figure 2 shows a construction according to the invention, a preferred embodiment thereof, in which the long nip roll and its counter-roll are connected together by traction rods which engage in bearing housings by a wedge action at both ends of the traction rods.

Figure 3A shows the embodiment of Figure 2 axonometricly.

Fig. 3B shows the solution of Fig. 3A seen from the machine direction.

Figure 3C is shown in Figure 3A, the solution of kx direction of the arrow in Figure 3B.

Fig. 4A shows the connection between the bearing housings detached in the step in which the drawbars are lifted from the connecting rod connecting them, e.g. by means of a hydraulic actuator or a winch.

As shown in Figure 4B, the upper bearing housing is lifted off the lower 30 bearing housings.

Figure 4C shows the snacks removed and removed.

Fig. 4D shows the apparatus as a whole as seen from the machine direction 35, corresponding to the maintenance phase of Fig. 4C.

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Figure 5 shows a separate view of the coupling surface 18 associated with the bearing housing of the lower long nip roll.

Fig. 6 shows a separate view of a drawbar assembly, in which the shaft 5 connects the drawbars from one end of the drawbars and in which construction the drawbars are further connected by a connecting rod from their central region, from which the assembly can be turned to the upper position.

Fig. 7A shows another embodiment of the invention, in which the pivot axis of the traction rods is located in the central region of the traction rods, in which embodiment, when the coupling is opened and locked, the traction rods are rotated about a central axis.

Fig. 7B shows the step in which the drawbars are turned to the open position, i.e. the connection between the bearing housings 11 and 12 is opened.

Fig. 7C shows an alternative embodiment in which the upper screws 29a are removed and the snacks 14alt14a2 are turned to the open position, whereby the snacks remain in connection with the lower bearing housing.

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Fig. 8A is a machine direction view of the embodiment of Figs. 7A-7C with the upper and lower bearing housings interconnected.

Fig. 8B shows the step after Fig. 8A with the connection between the bearing housings disconnected.

Fig. 9 shows the hydraulic actuator related to the embodiment of Figs. 7A-7C in more detail.

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Fig. 10A shows an alternative embodiment of the invention, which otherwise corresponds to the embodiment of Figs. 7A-9, but in which the hydraulic actuator 30 has been replaced by a screw device 40.

Fig. 10B shows the embodiment of Fig. 10A with respect to the screw device 40 in more detail with the parts separated from each other.

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Figure 1A shows the long nip press apparatus of a paper machine. In the press apparatus shown in Fig. 1A, a web W is fed to the lower long nip press roll 10a! and e.g. a nip N between the heated counter roll 10a2 between the felt H of the felt and the roll surface of the counter roll 10a2.

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Figure 1B shows a prior art long nip press roll seen from the machine direction. Long nip of life 10a! and 10a2 is shown in the figure by reference arrow N. The felt H and the web W are guided through the nip N. Roll 10a2 may be a heated roll or an unheated roll.

The long nip roll 10a2 comprises loading means e1, e2 ... known per se. Said loading means, preferably cylinder means, are located on a static non-rotating central axis f. from the web. By web W in this invention is meant a paper or board web. Thus, according to the prior art, the long nip press roll 10a generally below in the figures comprises a flexible closed conveyor belt sheath adapted to run along the surface of the load shoe, i.e. the shoe n, whereby a wide slide shoe along the surface of the sliding shoe against the counter roll in the pressing nip N. The counter roll 10a2 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 10a2 may also be a non-heated roll.

As shown in Fig. 2, the long nip roll 10a and the counter roll 10a2 together form a press nip N 1. the geometric center and 30 axes of rotation are denoted by X 1 and the geometric ·, center and axis of rotation of the counter roll 10a2 are denoted by X 2. According to the invention, the long nip roll 10a! the bearing housings 11 and the counter roll 10a2 connected to the bearing housings 12 side and the drive side ends to each other.

35 As shown in Fig. 2, the construction comprises an axis 13, the geometric center and the axis of rotation of which are denoted by X3. The medicine groove 12 of the counter roll 10a2 97484 comprises a through hole 130 for the shaft 13. Pull rods 14a are pivotally suspended on the shaft 13! and 14a2 and are connected to each other by a connecting rod 15. Pull rods 14ax and 14a2 on both sides of the nip plane comprise coupling surfaces 17, preferably wedge surfaces, and most preferably cylindrical or conical surfaces. The wedge surfaces 17,18 can also be planar and. This surface is located at the outer end of the drawbar 14a! to the connecting surface 18.

Correspondingly, in the embodiment of Figure 2, the drawbar 14ai, 14a2 comprises at its end, where also the shaft 13 is located a coupling surface 19, which is also preferably a cylindrical or conical surface, said surface in each drawbar 14a !, 14a2 engaging a conical surface 20 of a corresponding housing shape. 20 may also be planar. The coupling event is similar, i.e. the coupling surface 19 of the drawbars wedges the opposite surface 20 of the bearing housing and by means of the wedge effect 20 a traction force is applied to the drawbars 14a1,14a2 and harmful clearances are removed from the coupling between the bearing housings.

The shaft 13 at the other end of the drawbar 14a1,14a2 comprises nuts 13 'by which the locking of said end of the drawbar 14a1,14a2 can be removed, after which the shaft 13 acts only as a suspension shaft and a pivot shaft of the drawbars 14a1,14a2.

According to the invention, the shaft 13 is located with its geometric central axis X3 so that said shaft X3 is perpendicular to the load plane F of the load forces 30 of the nip N. Thus, the shaft 13 is perpendicular », · to the long nip roll 10a! against the geometric central axis Χχ and against the geometric central axis X2 of the counter roll 10a2 and the pivoting of the drawbars 14alt14a2 takes place perpendicular to the machine direction K. In this way, a favorable direction of rotation is obtained for the drawbars 14ai, 14a2, whereby they take up as little space as possible in the machine direction, since the drawbars are turned transversely to the machine direction. The pull rods 14ai, 14a2 are provided with screws 16 close to the coupling surface 17 6 97484, by means of which the locking between the coupling surfaces 17 and 18 is achieved and released as follows.

Upon providing a lock on the wedge surfaces 17 and 18; Between 19 and 20, the ends of each drawbar 14a2,14a2 are connected to the bearing housing 11 so that the wedge surfaces 17,18 meet. This export is carried out by using screws 16. The actual locking force is obtained by turning the nut 13 'of the shaft 13. Thus, the locking is achieved substantially by turning the screw 13 'of the shaft 13, whereby the wedge surfaces 17, 18, 19, 20 10 are locked to each other. When the coupling between the rollers is opened, the nut 13 'is loosened, whereby when the wedge angles are selected large enough the wedge locks open on the surfaces 17 and 18; Between 19 and 20. Finally, loosen the screws 16.

Within the scope of the invention, of course, there is a possible embodiment in which the drawbar 14a1, 14a2 comprises wedge surfaces 17 only at its other end, e.g. at its outermost end.

In the embodiment of Figure 2, there are spacers 21 between the bearing housings, which comprise wedges 22c above the wedge and wedges 22b below. By means of said wedges, the separate snacks 21 can be positioned in a precise position relative to the bearing housings. With the fastening screw 23, each snack 21 can be fastened to its bearing housing on its base 25.

As shown in the figure, the upper bearing housing comprises a lifting lug 26 connected to said bearing housing by fastening screws 27. The structure of Figure 2 is symmetrical with respect to the load plane F in the vertical plane.

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

Thrust rods 143 to 1432 are pivotally connected to the shaft 13 passing through the bearing housing / 130 to the upper bearing housing. In this embodiment, the outermost end of the drawbars 1432,1432 comprises coupling means and wedge means, i.e., a coupling surface 17 and a mating surface 18, the coupling between said surfaces pressing the pull rod 35 against its mating surface 18 in the bearing housing and providing a clearance-removing coupling between the bearing housings. By means of the fastening bolts 16, li 7 97484 passing through the end of the drawbar 14a1,14a2, the coupling surfaces 17 and 18 are pressed together and the bearing housings 11 and 12 are locked together by the action of a wedge. The solution shown in Fig. 3 has a coupling surface 17 preferably a conical surface and a coupling surface 18 5 in the bearing housing, respectively. When the screw 16 is used and the surfaces 17 and 18 are pulled together and a strong connection is made between the bearing housings by the action of a wedge. The screws 16 lock and open the wedge connection between the surfaces 17 and 18. The drawbars 14a1,14a2 are connected by a rod T from which the lifting of the drawbars can be performed.

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Fig. 3B shows the solution of Fig. 3A when viewed from the machine direction.

Figure 3C shows the direction the apparatus of Figure 3B, the arrow of Figure 3B ^.

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In Fig. 4A, the coupling between the bearing housings is opened and the drawbars are lifted up from the connecting rod.

As shown in Figure 4B, the upper bearing housing is lifted off the lower 20 bearing housings.

As shown in Figure 4C, the snacks 21 have been removed and removed.

Fig. 4D shows the apparatus as a whole corresponding to Fig. 4C. 25 maintenance steps.

Figure 5 is a separate view of the coupling surface 18 associated with the lower long nip roll bearing housing.

Fig. 6 shows a separate view of a drawbar assembly, in which the shaft 13 connects the drawbars 14alt14a2 at one end of the drawbars 14a1) 14a2 and in which the drawbars are further connected by a connecting rod T, from which the drawbars are lifted when the coupling between the bearing housings is opened.

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Fig. 7A shows another embodiment of the invention, in which, in a manner similar to the previous embodiment, the bearing housings 11 and 12 are connected to each other by means of pull rods 14a1, 14a2. Accordingly, in the embodiment of Fig. 9, each drawbar is rotated so that the pivot shaft X3 is located perpendicular to the load plane F in the nip N between the rollers. The shaft 13 in the embodiment of Fig. 9 is located in the middle of the drawbars 14a1 (14a2). on axes 13 about their geometric central axis X3.

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In the embodiment of Figure 7A, each drawbar 14a1,14a2 comprises, as in the embodiment of Figure 2, at the ends of the drawbars, wedge surfaces 17 and 19 engaging their mating surfaces 18 and 20 in bearing housings 11 and 12. Said surfaces 17, 18, 19 and 20 are preferably conical surfaces. The cones 17,18; 19,20 of the coupling-15 differ from each other in such a way that when the coupling surface 17 is placed on the opposite surface 18 and the coupling surface 19 on the opposite surface 20, respectively, there is a wedge angle between the surfaces so that the surface 17,18 can be wedged against its opposite surface 19,20. This provides a good force effect and also a good adhesion between the pins. The clearances between the bearing housings are removed.

In the embodiment of Fig. 7A, there is a spacer 21 between the bearing housings 11 and 12 on both sides of the nip plane and the structure is symmetrical with respect to the load plane F in the nip N. The same also applies to the embodiment described above. A shaft 13 is fixedly connected to said spacers 21, comprising a nut 28 at its end. The spacers 21 are connected to the upper bearing housing and the lower bearing housing by separate screws 29a, 29b and are guided by wedges 22a, 22b relative to the bearing housings 11,12. The hydraulic actuators 30 are located in the free space C of the snacks 14a1 (14a2). There is a separate actuator for tightening and a separate actuator for opening. By opening the nut 28 and using the hydraulic actuator 30, the snack is attached to the mating surfaces 18,20 and opened in the other direction. 18; 19,230 wedge lock.

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Fig. 7B shows the step in which the nut 28 is loosened and the snacks 14aj, 14a2 are turned by turning the handles D, before which a wedge lock is opened by the hydraulic actuator 30 between the snack and the associated bearing housings. In the embodiment of the figure, the lower screws 29b are opened, whereby the upper medicine housing with its associated rollers is lifted off the lower bearing housing as shown in the figure. In this case, the snacks 21 rise with the upper bearing housing.

Fig. 7C shows an alternative embodiment in which the upper screws 29a are removed and the spacers 14a1, 14a2 are turned to the open position. The spacers 21 remain in connection with the lower bearing housing 11.

Fig. 8A is a machine-side view of the embodiment of Figs. 7A-7C with the coupling between the upper and lower bearing housings on.

Fig. 8B is a machine side view of the embodiment of Figs. 7A and 7B with the couplings between the rollers opened 20 and the spacers raised with the upper bearing housing apart from the lower bearing housing.

Figure 9 shows in more detail the hydraulic actuators 30 related to the embodiment of Figures 7A-7C. The hydraulic actuators 30 are associated with a separate annular central body 31 connected by a pin 32 to a shaft 13. The central body 31 comprises annular flange portions 33a, 33b connected thereto, comprising movable piston portions 34a, 34b. The piston parts move in a piston chamber 35, to which a pressurized medium is introduced along the channel 36. The piston parts open to different sides of the core-30 pieces and thus the other piston parts act on the wall Cx of the space C '' and the other piston parts act on the wall C2 of the space C.

Thus, by alternatively using the piston parts, the snack 14a is moved! the arrow L i or L 2 in the direction of the arrow. The shaft 13 comprises at its end a flange 37 with screw holes 38, through which the shaft 13 is fixedly connected 35 to the spacer 21 of the screw 38 '. By opening the end nut 28 of the shaft 13, the snack 14a is released! move and the wedge engagement is accomplished by a wedge mechanism 10 97484 by moving and tightening the end nut 28 of the piston of the hydraulic actuator 30 at fluid pressure. As shown in the figure, a pressure medium source can be connected to the flange pressure fluid passages while the hydraulic actuator 30 is operated. The shaft 13 5 comprises threads j in which the nut 28 moves from its threads.

Fig. 10A shows an alternative embodiment of the invention, which otherwise corresponds to the embodiment of the previous Figs. 7A-9, but in which the hydraulic actuator 30 has been replaced by a screw device 40.

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Figure 10B shows the actuator structure of Figure 10A in more detail. The screw device 40 is adapted to surround the shaft 13 and to join its screw threads to opposite holes in the shaft 13. The screw device 40 comprises a nut part 41 and a sleeve part 42 and a flange part 43 at the end of the sleeve. The flange part 43 of the flange 15 is adapted to move in the cavity space 140 of the pull rod 14aj.

The second flange 44, which is screwed to the pull rod 14a !, is adapted to hold the movable flange portion in the cavity 140. Thus, when the screw is moved in the direction L3, the snack is moved in the same direction and the screw 40 in the direction L4 is pushed in the said direction. between bearing housings.

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Claims (11)

11 97484 A coupling structure between the rollers (10a1> 10a2) of a long nip press. the nip roll (10a!) and its counter-roll (10a2) are detachably connected to each other from their bearing housings (11,12), the bearing housings of the long nip press bearing-10 being connected by drawbars (14a1,14a2) which are subjected only to traction in the coupling situation, characterized in that the drawbars (14a1,14a2) comprise a suspension on the shaft (13) such that when the coupling between the rollers is opened and closed, the drawbars (14a1,14a2) are pivoted about the suspension shaft (13) 15 so that said opening and closing movement in said pivoting movement takes place substantially transversely p relative to the machine direction of the apericard / carton machine. Coupling structure between bearing housings 20 of a long nip press according to claim 1, characterized in that the drawbars (14a !, 14a2) comprise at least at one end a coupling surface (17; 19) which engages the counter surface (18; 20) of the bearing housing by a wedge action. Long nip press coupling structure according to one of the preceding claims, characterized in that the coupling surface of the pull rods (14a!, 14a2) is preferably cylindrical or conical and has the same shape as the mating coupling surface in the associated bearing housing (11, 12) and that the coupling bearings detachable-30 custom snacks. Coupling structure of a long nip press according to one of the preceding claims, characterized in that screw means (16) are arranged in connection with the coupling surface (17, 19), with which the wedge coupling between the surfaces 35 can be locked and opened. 12 97484 Coupling structure according to one of the preceding claims, characterized in that the shaft (13) is located at one end of the drawbars (14a1, 14a2) and is passed through a hole (130) in the bearing housing and that the shaft (13) comprises nut means for pulling the rod can be wedged into the bearing housing. Coupling structure according to claim 1, characterized in that the shaft (13) is located centrally with respect to the drawbars (14a1 (14a2)), the drawbars (14alt14a2) comprising at each end 10 coupling surfaces (18,19) for engaging the drawbars by rotating the bearing housings (11,12). ) to the mating surfaces (18,20). Coupling structure according to the preceding claim, characterized in that the shaft (13) has means by which the drawbar 15 (14a1, 14a2) can be moved linearly against the coupling surface. Coupling structure according to the preceding claim, characterized in that the coupling surface (17, 19) of the drawbars is preferably a conical surface and preferably of the same shape as the mating surface in the bearing housing 20 and that said surfaces have a wedge angle with respect to each other. Coupling structure according to the preceding claim, characterized in that there are spacers (21) between the bearing housings (11, 12) which are connected to the bearing housings by screws from above and below, and that the shaft (13) is connected to the spacer preferably by means of screws. when opening the intermediate connection, the shaft (13) and the associated snack can be left in one of the two bearing housings by opening the upper or lower knives of the snack and the associated bearing housing from the knife-30. Coupling structure according to one of the preceding claims 6 to 9, characterized in that the shaft (13) comprises in connection with a hydraulic actuator (30) comprising a central body (31) which is fixedly connected to the shaft (13) and that the circumference of the central body is connected flange parts (33a, 33b) comprising movable piston parts 13 97484 (34a, 34b), which piston parts (34a, 34b) move in the piston chambers (35) of the flange parts (34a, 34b), whereby the pressure of the pressurized medium introduced into the piston chamber ) moves the pull rod (14a1,14a2) in the central space (C) to the joint wall (Cx or C2) of that space, whereby the snack can be moved linearly away from or in connection with the bearing seats. Coupling structure according to one of the preceding claims 6 to 9, characterized in that before the rotation of the drawbar (14a1, 14a2), the coupling between the drawbar and the bearing housings is disengaged by a screw device (40) comprising a nut part (40). 41) and the associated sleeve portion (42) and further the associated flange portion, and that the flange portion (43) is adapted to move in the cavity (Τχ) of the snack (14alf14a2) between the cavity wall and the separate second flange (44) 15, thereby screwing its nut portion (41) by rotation moves the drawbar (14alt14a2) linearly either towards or away from the bearing housings. 97484 14