FI116309B - Interconnection design and method for interconnecting and locking rollers in a long nip press - Google Patents

Abstract

An assembly is disclosed for connecting and securing to each other rolls (1, 2) forming a nip in an extended nip press, whereby at least one of the rolls (1) of the extended-nip press includes loading means (3), advantageously at least one loading shoe for loading the endless-loop blanket (4) of one roll (1) against the other one (2) of the extended-nip press rolls so as to establish a nip (N), wherein the lower roll (1) and the upper roll (2) are dismountably connected to each other and the assembly connecting the rolls (1, 2) of the extended-nip press to each other includes rotatable connecting members (7, 8) by means of which the extended-nip press rolls (1, 2) are detachably connected to each other by their bearing blocks (5, 6). The invention is characterized in that the connecting member (7, 8) is pivotally coupled to the first bearing block (5) by means of a pivot pin (9) equipped with an oblique or any similar key surface (24) adapted mating with a first clamping surface (17) of the connecting member (7, 8).

Description

116309

The invention relates to a coupling structure and method for joining and locking the rolls of a long nip press as described in the preamble of the independent claims below.

The compression zone, or nip, of the long nip press consists of two substantially 10 parallel rolls, a shoe roll and a counter roll. The shoe roll comprises a rotatable, fluid-impermeable elastic webbing, a solid, non-rotatable support bar extending axially through the webbing, at least one press shoe supported by the support bar and having a concave upper portion and means for compressing the concave web portion of the shoe . The shoe roll and the counter roll are connected at both ends to the bearing housings.

A long nip press is characterized by a high nip line pressure. Line pressure can be • a · a ;; ** up to 2000 kN / m. Thus, a normal screw connection between the rollers is usually not * a • aa 20 possible. Thus, it is known that the bearing housings of the second roller can be "fitted" in the vicinity of the bearing housings of the second roller to connect the rollers and *: · *: lockable to the bearing housings by means of interlocking parts.

For example, patent publication FI 101633 discloses a coupling structure between '25 long nip rolls and a method for joining long nip rolls. In the solution presented in *: * ', the bearing housings of the long nip press rolls are joined together:' by means of bandages. The binding member disclosed in the publication is adapted to pivot with respect to the bearing housing and such that the end of the binding member is adapted to engage by a wedge effect on the other bearing housing J. Moving or loosening the binding member from the bearing housing in connection with the binding member »* * t · '•• 30 takes place using a hydraulic cylinder. In the structure disclosed in the publication 2,116,309, two roller ends are used on each roller end, which are locked to the sides of the bearing housing on both sides of the transverse center axis of the roller machine. There is a pivot point at each end of the bandage member, whereby the bandage member can be optionally operated by pivoting the bandage member 5 on either of the bearing housings above or below. The weakness of this structure is the high space requirement and its inadequacy for old machine rebuilds.

US 5,547,547 also discloses a coupling structure 10 between long nip rolls using attachments for bearing housings. The coupling structure disclosed in the publication comprises u-rail bonding members engaging the mating surfaces of the roller bearing housings. Each of the bonding members further comprises pivot points on which the bonding member is pivotable and secured to the abutment face in the bearing housing. According to the disclosure, the structure further comprises a pair of binding members at each end of the hydraulic actuator 15 to which the ends of the binding members of the pair of binding members are connected and by means of which the actuator can be pivoted on the pivot points. The problem with the solution presented in the publication is that. since the pivoting of the binding members is accomplished by means of separate pivot points, the space requirement for opening the coupling structure increases. The solution is highly accurate 2Ö. clearance requirements to ensure operation. Requires a large initial clearance; ·· To open.

The coupling structure and method for connecting and locking the rolls of the long nip press according to the present invention are intended to eliminate or at least reduce the problems arising from the above-mentioned prior art.

It is a further object of the present invention to provide a coupling structure and method for interconnecting rolls of a long nip press which is simple in construction and operation and does not require a large space for opening and / or locking the coupling structure 3o.

3, 116309

Among other things, to accomplish the aforementioned purposes, the coupling structure and method according to the invention are essentially characterized by what is set forth in the characterizing parts of the appended independent claims.

5

Typically, the coupling structure of the present invention is pivotally secured to the first bearing housing by a pivot pin having a wedge-shaped clamping surface that is adjustable against the first coupling surface of the coupling member.

10

Thus, the fastening of the bandage member by means of a pivot pin having a clamping surface thus enables the bandage to be rotated without a separate pivot point, whereby the coupling structure is simple and functional. Further, the space required for the opening of the dressing member is substantially reduced compared to known solutions 15.

In a preferred coupling structure according to the invention, the bonding member comprises a recess extending through the bonding member through which a pivot pin may be provided for attaching the bonding member to the first bearing housing and having a peripheral surface 2Ö of the recess at least partially obliquely formed. By a recess comprising a bandage, is meant a hole or slot in the bandage having at least a partially oblique edge. In addition to tensioning the bonding member, the slant :: clamping surface and coupling surface provide movement of the binding member during tightening which locks the binding member into another bearing housing.

X

»

Preferably, the pivot pin is secured and locked to the first bearing housing by an anchoring member passing through the pivot pin and the bonding member. Anchoring means in this context a piston rod or other means suitable for locking.

'* 30 4 116309

A preferred coupling structure in accordance with the present invention has a space in the periphery of the recess of the dressing member for accommodating a locking pin to prevent pivoting movement of the pivot pin and the dressing member and radial movement of the dressing member. In this context, the circumferential space is defined as a notch, groove, or other similar shape. The locking pin placed in the aforementioned space keeps the bandage member and the pivot pin stationary relative to each other when rotating the bandage member. The clamping surface and the coupling surface remain substantially in the same position relative to one another during pivoting of the bandage, thereby facilitating the repositioning of the bandage.

Typically, the second bearing housing end portion of the coupling portion of the coupling member of the present invention has a projection comprising a second coupling surface of the coupling portion. The surface of the second coupling surface is preferably curved and engages with the abutment surface in the second bearing housing. Interconnection between the aforementioned surfaces refers herein to the alignment of the surfaces, at least in part, with the surfaces at least partially parallel. Here, the contact surfaces in the second bearing housing comprise preferably curved planar surfaces on opposite sides of the bearing housing. The coupling and counter surface may also be conical, whereby the structure is self-locking.

In a very preferred coupling structure according to the present invention, *: * ·: the bonding member is secured to the bearing housing such that the radius of the circular arc of the pivoting movement of the bonding member is perpendicular to the machine direction. That is, when the pivoting portion of the pivotally secured to the first bearing housing is pivotally detached from the second bearing housing, the pivoting portion pivots substantially in the direction of the longitudinal axis of the roll, i.e., «, $ 2 across the machine. In this context, turning of the binding member means an automatic or manual operation during which the position between the binding member and the bearing housing changes.

The method of the present invention is essentially characterized in that the '3'0 bonding member is secured to a first bearing housing by a pivot pin and a second 5 116309 bearing housing by a second engagement surface of a binding member positioned against its abutment surface; with a pivot pin to the first bearing housing, the clamping surface of the pivot pin moves the bonding member so that the second engagement surface of the aforementioned bonding member is moved toward the receiving face of the second bearing housing. Preferably, the pivot pin is secured to the first bearing housing by an anchoring member to be inserted through the pivot pin.

In the method of the present invention, the engagement provided by the bonding member 10 between the bearing housings is unlocked by loosening the pivot pin locking and partially displacing the pivot pin in the first bearing housing to release the second engagement face of the bonding member from the second bearing housing. The displacement of the pivot pin is preferably accomplished by means of a pressurized medium within the pivot pin.

15

The major advantage of the coupling structure and method according to the present invention is the structural and functional simplicity of the invention. The invention. has a reliable construction and reliable locking properties. j · * 'In addition, opening and closing the switching structure takes up little space. Further, the structure of the 20th invention is advantageous to manufacture.

The invention will now be described in more detail with reference to the accompanying drawing, in which Figure 2.5 schematically shows a side view of rollers of a long nip press connected by a coupling structure according to the present invention, ... * Fig. 2 schematically illustrates schematically illustrates a 3Ό dressing member for use in the present coupling structure, 6116309

Fig. 4 schematically shows an enlarged and cross-sectional view of the coupling structure shown in Fig. 1, part of the coupling structure according to the invention, Fig. 5 schematically shows a opening arrangement of the coupling structure according to the present invention;

Figures 1 illustrate, by way of example, a longitudinal nip press of a papermaking machine in a transverse direction of the machine 10, in which the web W is guided to the nip N between the lower shoe roll 1 and the counter roll 2. The counter roll may be a heated or non-heated roll. The shoe roll 1 comprises loading means (not shown in the figures) and a strap 4 made of a flexible and impermeable material.

The loading means comprise at least a loading shoe and the actuators belt belt

15 for loading with a loading shoe towards the counter roll of the aforementioned nip N

for forming and removing water from the web fed to the nip W. By web W

refers to a paper or board web. The long nip press comprises. also other parts and members not shown in the figure to clarify the pattern.

Such means include, for example, the upper roller hoisting machine, means for supplying coolant and lubricant 20 to the surface of the press shoe, etc. In addition, the long nip press ·: * ·: can be implemented in reverse, i.e. with the shoe roll positioned above and:

Fig. 2 is an end view of the rolls 1 and 2 of Fig. 1, viewed from the machine direction. 2.5. As shown in Figures 1 and 2, the rollers are coupled to each other by a coupling according to the present invention. In engagement, the first bearing housing 5 (the upper bearing housing in the figure) and the second bearing housing 6 (the lower bearing housing in the figure), and thus the upper roller and the lower roller, are interconnected by means of bonding members 7 and 8. At each end of the rolls, the bearing housings of the rolls are joined to each other by 3U similar tie parts.

7, 116309

The end of the first bearing housing 5 of the binding members 7 and 8 is secured to the first bearing housing 5 by pivot pins 9 on which the binding members can be pivoted. At the end of the second bearing housing 6 of the bonding parts 7 and 8 is a projection 5 10 which engages the abutment faces 11 and 12 in the second bearing housing 6.

The locking parts are secured to the bearing housings with screws 13.

As shown in the figures, cylinders 14 are mounted between the first bearing housing 5 and the bonding members 7 and 8, which facilitates the pivoting of the bonding members on the pivot pins 9 10. The bandages 7 and 8 further comprise a locking device 15 for locking the bandage in the open position.

The projection 10 has a curved surface facing the abutment surface and preferably has a radius of curvature equal to the distance of the projection surface from the center of the pivot pin 15. Similarly, the bearing surfaces 11 and 12 of the second bearing housing are curved and preferably have a radius of curvature equal to the distance of the surface of the bearing surface from the center of the pivot pin attached to the first bearing housing. The counter surface 11 and 12 of the projection 10 may also have a conical shape.

Fig. 3 is a cross-sectional view showing a magnification of the attachment member 7 by means of a pivot pin 9 to the first bearing housing 5. By means of anchoring member 21 The first coupling surface 17 is against the wedge-shaped clamping surface 24 of the pivot pin which has forced the binding member upwardly during tightening. At the end of the pivot bore t *;., * * Of the bearing housing, a cylinder space 25 is provided which has an anchoring member and protrusions 26 therein.

* · 8 116309

Fig. 4 is a schematic representation of a forged steel binding member 7 and 8 used in the coupling structure and a cross-section thereof. The bandage portion comprises a recess 16 extending through the bandage portion, the peripheral surface of the recess being partially oblique to form the first engagement surface 17 of the dressing portion. The recess 16 further has a space 18 located opposite said engagement surface when the bandage is turned.

The bandage member further comprises a projection 10 which comprises a curved or conical surface forming a second engagement surface 10 18 of the bandage member. The binding member has recesses 20 for the screw means that lock the binding member into the bearing housings.

Fig. 5 is a schematic view of an opening arrangement of a coupling structure according to the present invention. The bolts 15 locking the bearing portions 5 and 6 of the tie member 7 have been removed and the locking nut 22 locking the pivot pin 9 has been opened to the stop. Connected to the pivot pin 9 is a hydraulic hand pump 28, which is pumped to exert pressure on the pivot pin cylindrical space shown in Fig. 4, which is delimited by the projections of the anchoring member. as piston rings, whereby the pivot pin moves outwardly from the first bearing housing 5 and the bore therein. Thanks to the 2D wedge-shaped clamping surface 24 of the pivot pin 9 and the oblique coupling surface 17 * "" of the binding member, the bonding member 7 (8) has been allowed to descend; 16, where a joint locking pin 27 can be mounted through the hole in the base of the pivot pin, which binds .25 when rotating to keep the pivot pin 9 and the bandage member 7 in contact with each other. , from the counter surface 11, the bandage can be pivoted to the open position by the cylinder shown in Figures 1 and 2.

116309 9

Figure 6 shows the coupling structure in the open position as viewed from the machine direction. The binding member 8 is locked in its sideways position by a locking device 15. When the coupling structure is in the open position, the upper roller and the lower roller can be detached, for example, to change the shoe roll belt. The rollers are locked in reverse order 5.

The invention is not intended to be limited in any way to the embodiment described in the preceding description, but may be varied within the scope of the inventive idea claimed.

10 • · i

Claims (11)

116309 A coupling structure for interconnecting and locking the nip forming rolls (1, 2) of the long nip press, wherein one of the long nip press rolls (1) 5 comprises loading means, preferably at least one loading shoe for loading the belt (4) of the roll (1) for forming a nip (N), wherein the lower roll (1) and the upper roll (2) are removably connected, and wherein the coupling structure between the long nip press rolls (1, 2) comprises pivotable binding members (7, 8) having 10 long nip press rolls (1, 2). ) is detachably connected to its bearing housing (5, 6), characterized in that the binding member (7, 8) is pivotally attached to the first bearing housing (5) by means of a pivot pin (9) comprising a wedge-shaped or any clamping surface (24) against the first engaging surface (17) of the bandage member (7, 8). 15 Coupling structure according to Claim 1, characterized in that the bonding member (7, 8) comprises a recess (16) extending through the bonding member (7, 8) through which the pivot pin (9) can be arranged to secure the binding member (7, 8) to the first bearing housing (5). ), and the recess (16) of which has at least a partial oblique surface or any 2.Q. shaped, forming the first engaging surface (17) of the binding member (7, 8). Coupling structure according to Claim 1 or 2, characterized in that: the pivot pin (9) is fixed and locked to the first bearing housing (5) by an anchoring member (21) passing through the pivot pin (9) and the bonding part (7, 8). 25 / Coupling structure according to one of the preceding claims, characterized in that the circumference of the recess (16) has a space (18) to which a locking pin 'I' (27) can be fitted with a pivoting movement between the pivot pin (9) and the binding part (7, 8). and radial: ;; / to prevent movement. '3 σ' 116309 Coupling structure according to one of the preceding claims, characterized in that the end part facing the second bearing housing (6) of the bonding part (7, 8) has a projection (10) comprising a second coupling surface (19) with a curved surface. or conical and engaging the abutment face (11, 12) of the second bearing housing (6). Coupling structure according to one of the preceding claims, characterized in that the stop surfaces (11, 12) in the second bearing housing (6) comprise curved or conical plane surfaces on opposite sides of the bearing housing. 10 Coupling structure according to one of the preceding claims, characterized in that the radius of the circular arc of the pivoting movement of the bandage member (7, 8) is perpendicular to the machine direction. A method for joining and locking the nip forming rolls (1, 2) of a long nip press, wherein the bearing housings (5, 6) of the ends of the nip forming rolls (1, 2) are joined by means of binding members (7, 8), and using a binding member (7, 8) movable between the open and closed positions, characterized in that the bonding member (7, 8) is secured to the first bearing housing (5) by means of a pivot pin (9) and .26 * to the second bearing housing by an adjustable bonding member (11, 12). (7, 8) with a second coupling surface (19), and that the pivot pin (9) comprises a wedge-shaped or any-shaped clamping surface (24) which is fitted against the first coupling surface (17) of the dressing member (7, 8). 8) pivot pin. (9) moves the clamping surface (24) of the pivot pin (9) to the first bearing housing so that the second coupling surface (19) of the above-mentioned binding member (7, 8) is displaced. / the bearing surface (11, 12) of the second bearing housing (6). . Method according to Claim 8, characterized in that the pivot pin (9) is secured to the first bearing housing (5) by an anchoring member (21) to be inserted through the pivot pin (9). 116309 Method according to Claim 8 or 9, characterized in that the engagement provided by the bonding part (7, 8) between the bearing housings (5, 6) is unlocked by loosening the locking of the pivot pin (9) and partially moving the pivot pin (9) in the first bearing housing the second coupling surface (19) of the bonding member (7, 8) is detached from the second bearing housing (6), after which the binding member (7, 8) is pivotable on the pivot pin (9). Method according to claim 10, characterized in that the transfer of the pivot pin (9) 10 is carried out by means of a pressurized medium inside the pivot pin (9). • · »* * * · · t t Iti • · I» »» 1 1 6309