DE29702362U1 - Press roll - Google Patents

Description

EUROPEAN PATENT ATTORNEYS

PATENT AND LAWYERS

MANITZ, FINSTERWALD & :

·

MANlTZ. FINSTERWALO 1 PARTNER · P.O. BOX 32 16 11 · B0508 MUNICH

Voith Sulzer
Paper Machinery GmbH
St. Pöltener Str. 43

89S22 Heidenheim

AUSTRIAN PATENT ATTORNEYS

DR. GERHART MANITZ · oipl-phys.

MANFRED FINSTERWALD · oipl.-ing.. dipl.-wirtsch.-ing.

DR. HELIANE HEYN · oipl-chem.

DR. MARTIN FINSTERWALD · Dipu-ING.

STEPHAN THUL · oipl-phys.

RALF ALBRECHT · oipl-ing.

DR. DIETER PELLKOFER · dipl.-ing.

CHRISTIAN SCHMIDT · dipl.-phys.

GÜNTHER KURZ · oipl-ing.

WERNER GRÄMKOW ■ dipl-ing. i-1983|

BRITISH CHARTERED PATENT ATTORNEY

JAMES G. MORGAN · b. se. iphys.i. o.m.s.

LAWYER

MARION CHRISTIANE SCHMIDT

REPRESENTATIVES BEFORE THE EUROPEAN PATENT OFFICE

80506 MUNICH

PO BOX 22 16 11 · ROBERT-KOCH-STRASSE 1

TELEPHONE (089) 21 99 430 ■ FAX (089) 29 75 75

Munich, 29.04.1996 P/ho-S 5967

Press roller

NlTZ ■ FINSTERWALD · HEYN · MORGAN · FINSTERWALD · THUL · SCHMIDT · PELLKOFER · SCHMIDT ■ KURZ · S0S38 MUNICH · ROBERT-KOCH-STHASSE 1 ■ TAX No. DE 130 001 124

RALF ALBRECHT ■ 70372 STUTTGART (8AD CANNSTATT) · SEELBERGSTRASSE 23/25 · TELEPHONE (071 Il S6 72 61
MYFOSANK MÜNCH6N ■ 6 B80 US 980 · BLZ 700 200 Ol ■ POSTQIROAMT MÜNCHEN · 770 62-80S ■ BLZ 700 100 30 · VSREINSBAN1C MÜNCHEN ■ 57B 3St ■ BLZ7OO 202 70

P/ho-S 5967

The invention relates to a press roll for treating a material web in a press nip formed with a counter surface, with a roll shell, a carrier passing through it, at least one hydrodynamic and/or hydrostatic support element by means of which the roll shell is supported on the carrier in the region of the press nip, and two end walls rotatably mounted on the carrier, to which the two end sections of the roll shell are sealingly attached, wherein at least one of the two end sections is clamped to the relevant end wall.

The usually cloth-like roller shell of such a press roller must be replaced regularly due to wear. To do this, the roller shell to be replaced must first be removed from the end walls. The new roller shell must then be attached to the end walls in such a way that the required sealing is ensured. The type of attachment and sealing is decisive for the resulting downtime of the roller arrangement in question.

In a press roll of the type mentioned above, known from DE 3 5 01 635 C2, a respective end section of the roll shell is pressed against the outer end face of the relevant end wall by means of a clamping flange, which requires that the end section is bent radially inwards. To make this possible, the end section of the roll shell is provided with a large number of incisions. To center the roll shell, projections are provided on the end wall, which engage in the incisions on the edge of the shell when it is mounted.

The invention is based on the object of creating a press roll of the type mentioned at the beginning, in which the fastening of a respective roll shell is simplified while ensuring reliable sealing and in particular thicker and stiffer roll shells as well as roll shells with diameters that differ within certain limits can be fastened reliably and without any problems.

The object is achieved according to the invention in that a clamping ring is provided for clamping a respective end section of the roll shell, which is mounted and guided in an axially displaceable manner on a part of the relevant end wall that extends into the interior of the roll and is at least partially cylindrical, that the relevant end wall is provided in the circumferential area with an annular groove that is open towards the opposite end wall, and that the clamping ring has a wedge section that tapers axially outwards and engages in the annular groove, which has a conical outer circumferential surface that interacts with a conical counter surface in order to clamp the respective end section of the roll shell in the annular groove.

Due to this design, an air- and oil-tight fastening of each roller shell is possible in a simple and therefore quick manner, whereby the corresponding downtimes of the roller arrangement in question can be kept short. In addition, there is better adaptation to different shell diameters. The use of thicker and stiffer roller shells is also possible without any problems. Another advantage is that the shell ends can be cut straight.

The annular groove is expediently defined radially inwards by the part of the relevant end wall extending axially into the interior of the roll and radially outwards by the

Inner circumferential surface of an outer ring connected to the relevant end wall. The outer ring can preferably be detachably connected to the end wall by a bayonet lock.

The respective end section of the roller shell is sealingly received in a clamping gap formed within the ring groove. In an advantageous embodiment, this clamping gap is formed by the conical outer circumferential surface of the wedge section assigned to the clamping ring and the conical counter surface, preferably the inner circumferential surface of the outer ring.

The use of an additional pneumatic seal between the clamping ring and the outer ring makes it easier to center the roller shell. This can be subjected to internal pressure during fastening, which results in cylindrical alignment.

According to a further advantageous embodiment, an elastic expansion ring is inserted into the ring groove, on the inner circumference of which the conical counter surface is provided. In this case, the clamping gap that accommodates the respective end section of the roller shell is preferably formed by the cylindrical outer circumferential surface of the expansion ring and a cylindrical counter surface. The respective end section of the roller shell is clamped in this clamping gap in a sealing manner by the expansion ring being radially expanded by axially adjusting the clamping ring. If a slotted ring, preferably made of metal, is used as the expansion ring, the slots are expediently filled with rubber-elastic sealing material. The expansion ring can also be made of an elastic material, in particular plastic.

The axially displaceable clamping ring can be adjusted hydraulically in the manner of a piston or by means of adjusting screws or the like. In both cases, it is conceivable to spring-load the clamping ring, which can be displaced between a clamping position and a release position, in at least one direction, preferably in the direction of the release position.

Further advantageous embodiments of the press roller according to the invention are specified in the subclaims.

The invention is described in more detail below using exemplary embodiments with reference to the drawing; in which:

Figure 1 shows a radial partial section through one end

a variant of a press roller,

Figure 2 shows a radial partial section through one end

another variant of a press roller ,

Figure 3 is a representation similar to Figure 1 of a

another variant of a press roller and

Figure 4 is a partial plan view of the expansion ring of the

Figure 3 shown press roll, with the outer ring omitted.

Figure 1 shows the upper half of the left part of a press roller 10 for treating a material web in a press nip formed with a counter surface (not shown). The counter surface can be formed by a counter roller, for example.

The press roll comprises a preferably flexible roll shell 12 and a support (not shown) that passes through it. In the area between the two roll ends, which forms the press gap with the counter surface, the roll shell 12 is supported by at least one support element (not shown). This can be a hydrodynamic and/or hydrostatic support element that is preferably pressed hydraulically against the inside of the shell. A lubricating film is generated between this and the support element in a hydrodynamic or hydrostatic manner.

Two end walls 16 are rotatably supported on the carrier, of which only the left one is shown. The two end sections 18 of the roller shell 12 are attached to these end walls 16 in an air- and oil-tight manner. At least one of these two end sections 18 is clamped to the relevant end wall 16, as shown in Figure 1.

A clamping ring 20 is provided according to Figure 1 for clamping the respective end section 18 of the roller shell 12. This clamping ring 20 is mounted axially displaceably on a sectionally cylindrical part 22 of the end wall 16. This sectionally cylindrical part 22 extends axially into the interior of the roller from an axially outer flange 24 of the end wall 16. Starting from this flange 24, it comprises a first cylindrical section of larger outer diameter, which merges into a second section of smaller outer diameter, forming a step 26. A closure ring 30 is connected to the axially inner end wall of the sectionally cylindrical part 22 by means of screws 28, the outer diameter of which is equal to the outer diameter of the cylindrical section of the part 22 adjacent to the flange 24. This results in a gap between the

Step 26 and the end ring 30 and between the outer circumferential surface of the axially inner cylindrical section of the part 22 and the clamping ring 20 there is an annular space 32. On the cylindrical inner circumference of the clamping ring 20 there is an annular piston element 34 which is guided in a sealing manner on the right-hand cylindrical section of the part of the end wall 16 which extends into the interior of the roller. This annular piston element 34, which is formed in one piece with the clamping ring 20, divides the annular space 32 into two annular spaces which can be pressurized with a pressure medium in order to adjust the clamping ring 20 hydraulically in one direction or the other in the manner of an annular piston. In principle, however, pneumatic actuation of this annular piston is also conceivable. A sealing ring 36 is inserted into the ring grooves of the cylindrical section of part 16 adjacent to flange 24, the ring piston element 34 and the end ring 30.

Bolts 38 are also provided, the head of which is countersunk in the flange 24 and the shaft of which extends axially into the clamping ring. In principle, it is possible for the clamping ring 20 to be guided additionally by these bolts 38. However, adjusting screws can also be provided to adjust the clamping ring 20. Finally, it is also conceivable to initially adjust the clamping ring 20 in the manner described in the manner of an annular piston and then to fix it in the clamping position after the roller shell 12 has been centered using bolts, screws or the like.

An outer ring 40 is assigned to the end wall 16 and is preferably detachably connected to it by a bayonet lock. In the peripheral area of the end wall 16, an annular groove 42 is thus formed which is open towards the opposite end wall and which extends radially inwards through the part 22 extending axially into the interior of the roller and radially outwards through

the inner circumferential surface 44 of the outer ring 40 is limited. The bottom of this annular groove 42 is formed by the flange 24 of the end wall 16.

The clamping ring 20 has a wedge section 46 that tapers axially outwards and, at least in the clamping position, engages in the annular groove 44. This wedge section 46 has a conical outer circumferential surface 48 that interacts with a conical counter surface that in the present case is formed by the inner circumferential surface... 44 of the outer ring 40.

In the clamping position of the clamping ring 20 shown in Figure 1, the end section 18 of the roller shell 12 is thus clamped in a sealing manner in a clamping gap which is formed by the conical outer circumferential surface 48 of the wedge section 46 and the conical inner circumferential surface 44 of the outer ring 40.

The conical outer circumferential surface 48 of the wedge section 46 associated with the clamping ring 20 is provided with grooves 50 in order to increase the adhesion of the end section 18 of the roller shell 12 to the clamping ring 20. These grooves can be filled with rubber-elastic sealing material.

A pneumatic seal in the form of a hose 54 made of, for example, rubber-elastic material is inserted into a circumferential groove 52 of the clamping ring 20, which is provided adjacent to the conical outer circumferential surface 48. This hose can be pressurized with a pressure medium in order to press the roller shell 12 against the conical inner circumferential surface 44 of the outer ring 40. In the present case, the circumferential groove 52 receiving the hose 54 is provided in an axially central region of the clamping ring 20. The adjoining right-hand part of the clamping ring 20 is also conical, which in particular makes it easier to place the

roller shell 12 is facilitated.

The end wall 16 is rotatably mounted on a bearing ring 58 by means of a pivot bearing 56, which is axially displaceable with respect to the carrier. This allows the roller shell 12 to be tensioned after the end sections 18 are fastened to the end walls 16.

During assembly of the preferably cloth-like roller shell 12, the roller can be subjected to internal pressure after the hose 54 used for sealing has been applied, whereby the roller shell 12 is aligned and centered cylindrically. To establish and release the clamp, the clamping ring 20 is adjusted in the manner of a hydraulic ring piston.

Figure 2 shows a further variant of a press roller 10 in which the pneumatic seal has been dispensed with. The part 22 of the end wall 16 extending into the interior of the roller has a continuous cylindrical outer peripheral surface on which the clamping ring 20 is guided so as to be axially displaceable.

The clamping ring 20 is no longer adjusted hydraulically in the manner of a ring piston, but by means of screws (not shown). It is shorter than the clamping ring shown in Figure 1. It essentially only consists of the wedge section 46 with the conical outer circumferential surface 48. The conical outer circumferential surface 48 is in turn provided with grooves 50 which increase adhesion and are preferably filled with rubber-elastic material. In this case too, the clamping gap is formed by the conical outer circumferential surface 48 of the clamping ring 20 and the conical inner circumferential surface 44 of an outer ring 40 which is detachably connected to the end wall 16, for example by a bayonet lock. I

fii &iacgr; i

•&Iacgr;&Ogr;.: &Igr;!·:·. &Mgr;:"

Between the cylindrical part 22 and the clamping ring 20, a sealing ring 36 is again provided, which is arranged in an outer annular groove of the cylindrical part 22. Figure 2 shows the clamping ring 20 in the clamping position, in which the end section 18 of the roller shell 12 is clamped within the annular groove 42 in a clamping gap that is formed by the conical outer circumferential surface 48 of the clamping ring 20 and the conical inner circumferential surface 44 of the outer ring 40.

Via the pivot bearing 56, the front wall 16 is in turn rotatably mounted on a bearing ring which is axially displaceable with respect to the carrier.

In the further embodiment of a press roller 10 shown in Figure 3, an elastic expansion ring 60 is additionally inserted into the annular groove 42 formed between the cylindrical part 22 and the outer ring 40, the inner circumferential surface 62 of which forms the conical counter surface that interacts with the conical outer circumferential surface 48 of the clamping ring 20. In contrast, the outer circumferential surface 64 of the expansion ring 60 is cylindrical. The corresponding counter surface is formed by the cylindrical inner circumferential surface 66 of the outer ring 40. The clamping gap that accommodates the end section 18 of the roller shell is formed here between the cylindrical outer circumferential surface 64 of the expansion ring 60 and the cylindrical inner circumferential surface 66 of the outer ring 40.

The cylindrical outer peripheral surface 64 is in turn provided with grooves 50 to increase adhesion. For example, rubber-elastic sealing material can be inserted into these grooves.

In the present case, the clamping ring 20 is only hydraulically adjustable in the direction of the clamping position, i.e. to the left, in the manner of a piston. For this purpose, a

An annular space 68 pressurized with pressure medium is provided between the cylindrical part 22 and the clamping ring 20. In the direction of the release position, the clamping ring 20 is loaded by compression springs 70, which are supported on the one hand on the bottom of the annular groove 42 formed by the flange 24 and on the other hand on the clamping ring 20. The compression springs 70 are accommodated over most of their length in bores 72 formed in the clamping ring 20.

To form the annular space 68 that can be pressurized with pressure medium, the right-hand part of the clamping ring 20 has a smaller inner diameter than the left-hand part. Radially inward, this annular space 68 is in turn limited by a closing ring 30, which is connected to the cylindrical part 22 of the end wall 16 via screws 28.

Sealing rings 36 are arranged between the cylindrical part 22 and the clamping ring 20 as well as between the end ring 30 and the clamping ring 20.

The front wall 16 is in turn rotatably mounted via the pivot bearing 56 on a bearing ring that is axially adjustable with respect to the carrier (not shown here). This bearing ring can, as with the previous design variants,

ten, on a bearing journal assigned to the carrier or f

the like may be arranged. |

As can best be seen from Figure 4, the elastic expansion ring 60, which is preferably made of metal, is provided with slots 74, which results in a meandering shape. The slots 74 can be filled with rubber-elastic sealing material in order to ensure the required sealing effect.

By moving the clamping ring 20 against the force of the springs 70 hydraulically into the left clamping position (see Figure 3), the expansion ring 60 is radially expanded over the interacting conical surfaces 62, 48 and pressed outwards against the inner circumferential surface 66 of the outer ring 40, whereby the end section 18 of the roller shell is clamped. In the variant shown in Figure 3, the clamping ring 20 is moved hydraulically against the force of the compression springs 70 into the clamping position, while it is returned to the release position by the compression springs 70. In principle, however, it is also conceivable that the clamping ring 20 is actuated hydraulically or by adjusting screws in both directions, each against a spring force.

All versions always ensure an air- and oil-tight fastening. Deviations in the shell diameter can be compensated for without any problem. In a practical example, deviations of up to 5 mm were compensated for. The roller shell can be easily centered, for example by applying internal pressure to it during assembly. This automatically results in a cylindrical alignment. The shell can be changed quickly and easily so that downtimes of the roller arrangement in question are kept as short as possible. Apart from the better diameter adjustment, it is also possible to attach thicker and stiffer roller shells without any problem. This applies in particular to the version shown in Figures 3 and 4, which is provided with an expansion ring. The assembly of a roller shell is extremely simple and reliable in all versions.

Claims (1)

P/ho-S 5967 P*- b -claims Press roll (10) for treating a material web in a press nip formed with a counter surface, with a roll shell (12), a carrier passing through it, at least one hydrodynamic and/or hydrostatic support element, by means of which the roll shell (12) is supported on the carrier in the area of the press nip, and two end walls (16) which are rotatably mounted on the carrier and to which the two end sections (18) of the roll shell (12) are sealingly attached, with at least one of the two end sections (18) being clamped to the relevant end wall (16), characterized in that a clamping ring (20) is provided for clamping a respective end section (18) of the roll shell (12), which is mounted and guided in an axially displaceable manner on a part (22) of the relevant end wall (16) which extends into the interior of the roll and is at least partially cylindrical, that the relevant end wall (16) is provided in the peripheral region with an annular groove (42) open towards the opposite end wall (16) and that the clamping ring (20) has a wedge section (46) tapering axially outwards, engaging in the annular groove (42) and having a conical outer peripheral surface (48) which cooperates with a conical counter surface (44, 62) to clamp the respective end section (18); of the roller shell (12) in the annular groove ( 42 ) clamps. &iacgr; 2. Press roll according to claim 1, characterized in that the annular groove (42) is delimited radially inwards by the part (22) of the relevant end wall (16) extending axially into the interior of the roller and radially outwards by the inner circumferential surface (44) of an outer ring (40) connected to the relevant end wall (16). 3. Press roll according to claim 2, characterized in that the outer ring (40) is detachably connected to the end wall (16). . Press roller according to claim 3, characterized in that the outer ring (40) is connected to the end wall (16) by a bayonet lock. 5. Press roll according to one of the preceding claims, characterized in that the respective end section (18) of the roll shell (12) is received in a clamping gap which is formed by the conical outer peripheral surface (48) of the wedge section (46) associated with the clamping ring (20) and the conical counter surface (44). 6. Press roll according to claim 5, characterized in that the conical counter surface is formed by the inner peripheral surface (44) of the outer ring (40). 7. Press roller according to one of the preceding claims, characterized in that a pneumatic seal (54) is provided between the clamping ring (20) and the outer ring (40). 8. Press roll according to claim 7, characterized in that the pneumatic seal comprises a hose (54) which is inserted into a circumferential groove (52) of the clamping ring (20) and can be pressurized with a pressure medium, through which the roller shell (12) can be pressed against a counter surface (44). 9. Press roller according to one of claims 1 to 4, characterized in that an elastic expansion ring (60) is inserted into the annular groove (42), the inner peripheral surface (62) of which forms the conical counter surface. 10. Press roll according to claim 9, characterized in that the respective end portion (18) of the roll shell (12) is accommodated in a clamping gap which is defined by the cylindrical outer peripheral surface (64) of the expansion ring (60) and a cylindrical counter surface (66) is formed. 11. Press roll according to claim 9, characterized in that the cylindrical counter surface is formed by the inner peripheral surface (66) of the outer ring (40). 12. Press roller according to one of the preceding claims, characterized in that the expansion ring (60) is formed by a slotted ring preferably made of metal. 13. Press roll according to claim 12, characterized in that the slots (74) of the expansion ring (60) are filled with rubber-elastic sealing material. 14. Press roller according to one of the preceding claims, characterized in that the expansion ring (60) is made of an elastic material such as in particular plastic. 15. Press roller according to one of the preceding claims, characterized in that at least one of the surfaces forming the clamping gap is provided with grooves (50). 16. Press roller according to one of the preceding claims, characterized in that the conical outer peripheral surface (48) of the wedge section (46) associated with the clamping ring (20) or the cylindrical outer peripheral surface (64) of the expansion ring (60) is provided with grooves (50). 17. Press roller according to one of the preceding claims, characterized in that the clamping ring (20) is hydraulically adjustable in the manner of a piston. 18. Press roll according to claim 17, characterized in that at least one annular piston element (34) is provided on the inner circumference of the clamping ring (20), which is guided in a sealing manner on the part (22) of the relevant end wall (16) extending into the interior of the roller. 19. Press roller according to one of claims 1 to 16, characterized in that the clamping ring (20) is mechanically adjustable by means of adjusting screws or the like. 20. Press roller according to one of the preceding claims, characterized in that the axially displaceable clamping ring (20) is spring-loaded in one direction. 21. Press roll according to claim 20, characterized in that the clamping ring (20) which can be displaced between a clamping position and a release position is spring-loaded in the direction of the release position.