Sleeve roller for web section of fiber web machine

Abstract

The invention relates to a sleeve roller for a web section of a fiber web machine, the sleeve roller (21) comprising: a shaft beam (28) with a shaft column (53) supported in a bearing seat (54) equipped with a rocker arm bearing structure (56); two circular roller heads (29) and a belt ring (30) arranged around the axle beam and tensioned between the roller heads; a convex forming element (22) for removing water; and an adjustment device (60) configured to lock the axle beam (28) in place after adjustment of the forming element, the adjustment device comprising: an annular adjustment arm (64) with a support surface (62), the adjustment arm being attached to the axle post (53); and an eccentric adjustment element (66) pivoted to the rocker arm bearing structure (56) to support the adjustment arm (64) in place, the adjustment element (66) being lockable in place relative to the rocker arm bearing structure (56) to lock the adjustment arm (64) and releasable to change the position of the adjustment arm (64).

Description

TECHNICAL FIELD

[0001] The present invention relates to a sleeve roll for a wire section of a fiber web machine, the sleeve roll comprising:

[0002] a shaft beam with a shaft column supported in a bearing housing equipped with a rocker bearing structure,

[0003] two circular roll heads supported on the shaft beam and arranged rotatable,

[0004] a belt loop arranged around the shaft beam and tensioned between the two roll heads,

[0005] a convexly shaped forming element attached to the shaft beam and arranged between the shaft beam and the belt loop, wherein the forming element is in contact with the belt loop to form a rising pressure for removing water, and

[0006] an adjustment device configured to lock the shaft beam in place after adjustment of the forming element, the adjustment device comprising a ring-shaped adjustment arm with a support surface, the adjustment arm being attached to the shaft column. BACKGROUND

[0007] European patent No. 3913136 discloses a forming section of a fiber web machine. There is a sleeve roll with a belt loop arranged to rotate around a shaft beam. Inside the sleeve roll there is a curved forming element which forms a dewatering zone. The increased pressure squeezes water out of the fiber web formed by the fiber web machine, e.g. a paper machine, a board machine, a pulp machine or a tissue paper machine.

[0008] The position of the known forming element can be adjusted by an adjustment device. The adjustment device comprises a screw with which the position of the forming element is adjusted by rotating the shaft beam in relation to the rocker bearing structure supporting the shaft beam. The adjustment is made using the ring-shaped adjustment arm of the shaft column attached to the shaft beam, which is pushed with the screw. The problem with this adjustment with a screw is that the screw continuously transmits the torque acting on the shaft beam even when no active adjustment is made. In other words, the screw and its thread keep the shaft beam in place and prevent it from turning around its bearings during the operation of the sleeve roll. Thus, the force acting on the thread of the screw is very great, and it is extremely difficult to manufacture a thread that is both precise enough to meet the adjustment needs and strong enough to withstand the force acting on it. The force, the requirements of the adjustment precision and the operating conditions related to humidity together constitute a challenging problem in the implementation of the adjustment device. In practice it has been found that the screw used in the sleeve roll of EP3913136 is prone to corrosion and freezing solid, or the thread is prone to slipping during the adjustment, which causes the adjustment device to fail. SUMMARY

[0009] The object of the invention is to provide a sleeve roll for a wire section of a fiber web machine, which is more reliable in terms of adjustment than prior art sleeve rolls. The sleeve roll according to the invention is characterized as described below.

[0010] The present application provides a sleeve roll for a wire section of a fiber web machine, the sleeve roll comprising: a shaft beam with a shaft column supported in a bearing seat equipped with a rocker bearing structure; two circular roll heads supported on the shaft beam and arranged to rotate; a belt loop arranged around the shaft beam and tensioned between the roll heads; a convexly shaped element attached to the shaft beam and arranged between the shaft beam and the belt loop, wherein the shaped element is in contact with the belt loop to form an elevated pressure for water removal, and an adjustment device configured to lock the shaft beam in place after adjustment of the shaped element, the adjustment device comprising a ring-shaped adjustment arm with a support surface, the adjustment arm being attached to the shaft column. The adjustment device further comprises an eccentric adjustment element, which is articulated to the rocker bearing structure for supporting the adjustment arm in place, the eccentric adjustment element being lockable in place relative to the rocker bearing structure to lock the adjustment arm and releasable to change the position of the adjustment arm.

[0011] Further, the eccentric adjustment element is designed in shape to support the adjustment arm in different positions in different rotational orientations of the eccentric adjustment element.

[0012] Further, the eccentric adjustment element comprises: a support structure supported against the support surface of the adjustment arm, the support structure having a first locking hole; a shaft rod for attaching the support structure to the rocker bearing structure, the shaft rod having two end portions and a second locking hole, and a locking pin inserted in the first and second locking holes to lock the eccentric adjustment element to the rocker bearing structure.

[0013] Further, at least the support surface of the adjustment arm is made of acid-resistant steel, and the eccentric adjustment element is made of high-strength brass or bronze to avoid jamming of the eccentric adjustment element.

[0014] Further, the eccentric adjustment element has at least two, preferably 4 to 10, most preferably 8, alternative pairings of support surfaces for arrangement against the support surface at selected orientations of the eccentric adjustment element.

[0015] Further, each pairing of support surfaces has an independent eccentricity.

[0016] Further, each pairing of support surfaces is a plane perpendicular to the radial direction of the shaft rod of the eccentric adjustment element.

[0017] Further, the sleeve roll has a set of eccentric adjustment elements consisting of 2 to 6 eccentric adjustment elements, each having a different shape to achieve different positions of the convex shaping element.

[0018] Further, the set of eccentric adjustment elements is arranged to achieve a ±2° adjustment of the convex shaping element in the circumferential direction of the ring by 0.1 to 0.2° steps.

[0019] Further, the adjustment device comprises a support frame attached to the rocker bearing structure for supporting the eccentric adjustment elements from one end to the rocker bearing structure and from the other end to the support frame.

[0020] Further, the support frame has axial parts with spaces for the adjustment arms and the support frame between them and lateral parts attached to the axial parts to form support for the shafts of the eccentric adjustment elements.

[0021] Further, the support frame has two rotating supports arranged on both sides of the adjustment arms between the axial parts of the support frame, the rotating supports being rotatable for supporting the adjustment arms during rotation of the eccentric adjustment elements.

[0022] Further, the support structure comprises eccentric support parts supported against support surfaces of the adjustment arms and flanges supported against the support frame.

[0023] Further, the support surfaces are slots formed in the adjustment arms in the radial direction of the sleeve roll and the eccentric adjustment elements are arranged to fit inside the slots when the adjustment arms are locked in place.

[0024] The sleeve roll has a new type of adjustment device which solves the above problems. More precisely, the adjustment device further comprises eccentric adjustment elements which are pivoted to the rocker bearing structure to lock the adjustment arms in place, the adjustment elements being lockable in place relative to the rocker bearing structure to lock the adjustment arms and releasable to change the position of the adjustment arms. BRIEF DESCRIPTION OF DRAWINGS

[0025] The application will be described in more detail in the following with reference to the enclosed drawings, which show some embodiments of the application, in which:

[0026] Figure 1 a schematic side view of a shaping part equipped with a sleeve roll according to the application is shown,

[0027] Figure 2a side cross-sectional view of one end of a sleeve roll according to the application is shown,

[0028] Figure 3 a cross-sectional view in the cross direction of a sleeve roll according to the application is shown,

[0029] Figure 4 a partial horizontal cross-sectional view in the machine direction of an adjustment device of a sleeve roll according to the application is shown,

[0030] Figure 5 a partial vertical cross-sectional view in the machine direction of an adjustment device of a sleeve roll according to the application is shown,

[0031] Figure 6 a cross-sectional view of a support part of a support structure is shown. DETAILED DESCRIPTION

[0032] In the shown embodiment, the forming section comprises a first wire loop 10 and a second wire loop 11. Figure 1 The first wire loop 10 surrounds a forming roll 12, while the second wire loop 11 surrounds a breast roll 13. The direction of travel of the first wire loop 10 is indicated by arrow 14, while the direction of travel of the second wire loop 11 is indicated by arrow 15. The first wire loop 10 and the second wire loop 11 form a converging gap 16, such that the two wire loops 10, 11 converge in the area of the forming roll 12. The forming section further comprises a headbox 17 for supplying a pulp suspension to the gap 16 between the wire loops 10 and 11. After the forming roll 12, three suction boxes 18, 19, 20 are provided for removing water. Next is a sleeve roll 21 according to the application. Both wire loops 10, 11 travel through the sleeve roll 21, which is equipped with convex forming elements 22 for removing water. Preferably, the convex forming elements are curvilinear forming elements.

[0033] After the sleeve roll 21, a twin-wire section follows, on which water is removed from the fibrous web 23 travelling between the wire loops 10 and 11 by means of a suction box pair 24 located below the first wire loop 10. At the end of this twin-wire section, the direction of travel of the second wire loop 11 is turned by means of a second guide roll 25 and is brought into a return loop. At the site of the second guide roll 25, the second wire loop 11 is separated from the first wire loop 10, in connection with which the fibrous web 23 is attached to the first wire loop 10 by means of a further suction box 26 and is conveyed on the upper surface of the first wire loop 10 past a third guide roll 27, after which it is transferred to a subsequent press section.

[0034] As Figure 2The sleeve roll shown is used in the wire section of a fiber web machine, as described above. The sleeve roll 21 comprises a stationary shaft beam 28 and two preferably circular roll heads 29 having shaft columns 53 supported on the shaft beam 28 and arranged to rotate. Each roll head is preferably circular with a fixed radius. Furthermore, the sleeve roll 21 comprises a belt loop 30 arranged around the shaft beam 28 and tensioned between the two roll heads 29. The circular roll heads 29 form the belt loop 30 into a cylindrical shape, especially when tensioned and rotating. The belt loop 30 can then rotate around the shaft beam 28. Furthermore, a curved convex shaping element 22 is arranged between the shaft beam 28 and the belt loop 30. The shaping element 22 is in contact with the belt loop 30 to form an uplift pressure for water removal. In the present invention, the shaping element causes the belt loop 30 to locally bulge outwards from its circular shape to follow the shaping element of smaller radius. The radius of the curved shape of the shaping element is continuously or stepwise shortened.

[0035] The sleeve roll according to the present invention enables an adjustment of the shaping process by changing the position of the shaping element, also called "outstick". Here, the end of the shaft beam 28 is also provided with a bearing seat 54 and between the shaft beam 28 and a rocker bearing structure 56 belonging to the bearing seat 54 an adjustment device 60 is arranged. Thereby, a fine adjustment of the alignment of the sleeve roll is possible. This in turn minimizes the wear of the belt loop and the wire loop and maximizes the water removal effect. This rotational adjustment is shown in Figure 1

[0036] Figure 2 The essential components of the sleeve roll 21 are shown, but only a partial profile of the belt loop 30 itself is shown. The belt loop 30 is tensioned by moving at least one roll head 29 axially. The roll head is preferably equipped with a tensioning device having a hydraulic line inside the shaft and a central hole arranged on the shaft. This structure is simple and enables an accurate adjustment of the tensioning of the belt loop independently from other adjustments of the sleeve roll. The tensioning device can be a double-acting cylinder connected to the roll head. The roll head is preferably divided into two parts. The first part is an inner ring which does not rotate but can slide axially. The second part is an outer ring which is rotatable by means of a bearing. Thus, the belt loop can be tensioned adjustably even during rotation.

[0037] The roll head preferably has bearings with independent lubrication. In other words, the lubrication of the bearings is separated from the lubrication of the sliding elements and the shaping element.

[0038] According to an embodiment, the shaping element is arranged to be movable and tiltable relative to the shaft beam. The shaping element can be pivoted at its front end and preferably pushed against the belt loop by means of a hydraulic device. Alternatively, a mechanical device such as a screw rod can be used.

[0039] ​The cross section of the axle beam can be polygonal. Thereby, the axle beam is rigid and can be positioned at any angle.

[0040] The forming element is preferably convex and protrudes outwards from the circular belt loop. By pushing the forming element, the belt loop can be tensioned in both the machine direction and the cross machine direction without the involvement of other rollers. The maximum protrusion of the forming element is preferably less than 120 mm, preferably 30-90 mm. The sliding surface can also be arranged inwards from the belt radius to form an indented support of the belt loop, thereby reducing the outward protrusion of the forming element. The arrangement reduces the local elongation of the belt and helps to increase the life of the belt. The first part is a base which is pivoted to the axle beam. The second part is a contact part which is exchangeably fixed to the base. Thereby, the properties of the sleeve roller can be adjusted by merely exchanging the contact part. Fine adjustments can be achieved using the adjustment device according to the invention.

[0041] In front of the forming element, there is a fabric tension wrap on the sleeve roller which can be handled by a lubricated sliding surface in front of the forming element. The sliding surface together with the forming element forms a friction surface in the area of the fabric tension wrap. The wrap is preferably between 60-160 degrees relative to the sleeve roller. When properly connected, the sliding surface makes the bending stiffness of the axle stronger. Furthermore, the sliding surface can reduce the friction by lubrication and a lubrication spray device is provided before and / or through the sliding surface. The belt loop is pressed against the sliding surface during the wrapping of the fabric on the sliding surface and the tension provides the driving force for the sleeve roller. The lubricant is a fluid, preferably oil. Compressed air or a mixture of air and oil (even water) can also be used, especially in the case of a fluid pocket of the sliding surface.

[0042] The shaft beam can be made of a hollow polygonal and / or circular beam structure, which provides support for the forming element and other devices, and leaves space for the equipment inside the belt loop. The shaft beam is preferably made of a polygonal beam structure (e.g., with 6-12 rounded corners), to which the shaft post is attached. The polygonal shape is preferably made of a bent sheet metal, which is welded from at least two pieces. Alternatively, a casting of the shaft beam can be used. The fixed polygonal shaft beam is rigid to withstand large angular tensions from the belt loop, the protrusions of the forming element, and the fabric wrap angle. Surprisingly, high I-beams and simple square beams used for the press zone are not suitable for sleeve roller schemes with varying force angles. The sheet metal thickness is preferably 30-60 mm. The shaft structure according to the invention is a polygonal bent closed beam near the belt loop, wherein the bent portion follows the contour of the belt run to support the belt loop. The shaft is designed to meet the requirements of large wrap angles of the sliding surface and the forming element. Furthermore, there is space outside the shaft beam for the forming element and belt support, and the interior can also accommodate the forming element movement device and fluid connection. The shaft may have openings and hatches for maintenance of devices inside the shaft beam.

[0043] The roller head is supported relative to a fixed shaft via a sliding device. A device for axial movement of the roller head is provided, preferably a hydraulic cylinder device attached to the roller head and located inside the shaft beam. An indexing means associated with the bearing housing is also provided on the outside of the roller head. This allows for adjustment of the alignment of the sleeve roller. At least one roller head has an opening penetrating the shaft column for a lubricating oil inlet and outlet. This opening is sealed to increase the air pressure inside the belt.

[0044] As previously described, the sleeve roller 21 includes an adjustment device 60 for using an adjustment arm 64 (e.g., Figure 3 (As shown) The shaft beam 28 and the forming element 22 are adjusted via the shaft column 53. Adjustment can be achieved by rotating the shaft beam 28 via its shaft column 53 using the adjustment device 60. Figure 2 The position of the convex forming element 22 is shown. The adjustment device 60 for achieving adjustment is as follows: Figure 3 As shown. The adjusting arm 64 is attached to the post 53, preferably by means of an annular attachment flange 65 connected around the post 53. Preferably, the adjusting arm 64 has a corresponding mating member to fit against the annular attachment flange 65. The attachment flange 65 may be secured to the post 53 by, for example, a wedge 67 or other suitable means. The attachment flange 65 may have a toothed or similar structure for transmitting torque between the adjusting arm 64 and the post 53.

[0045] The position of the axle stub 53 and the adjusting arm 64 attached thereto is locked using an eccentric adjusting element 66 comprised in the adjusting device 60. The eccentric adjusting element 66 is supported against the support surface 62 of the adjusting arm 64. That the adjusting element 66 is eccentric means that the adjusting element 66 has a shape such that the point at which the adjusting element 66 supports the adjusting arm 64 changes when the adjusting element 66 is rotated. Thus, by rotating the adjusting element, the position of the shaping element can be changed via the adjusting arm. Each rotational position of the eccentric adjusting element corresponds to an individual position of the adjusting arm, and thus to an individual position of the shaping element.

[0046] Figure 3 A preferred embodiment of the present application is disclosed, wherein the support surface 62 of the adjusting arm 64 is a slot 76 formed in the adjusting arm 64. The longest dimension of the slot is in the radial direction of the sleeve roll. In each possible position of the adjusting element 66, the width of the slot 76 corresponds to the diameter of the adjusting element 66, so that only a minimal gap of about 10 - 40 μιη exists between the parts. In practice, there is no actual gap between the parts, but the minimal gap is only provided for mounting purposes. The advantage of using a slot 76 as the support surface 62 is that, since the support surface 62 is formed on both sides of the slot 76, locking of the adjusting arm 64 can be achieved using only a single adjusting element 66. The length of the slot 76 in the radial direction of the sleeve roll is greater than the width of the slot 76, so that neither the size change of the adjusting arm 64 nor the deflection of the sleeve roll exerts any force on the adjusting element 66.

[0047] A preferred embodiment of the adjusting element 66 is shown in Figures 3 to 5 The eccentric adjusting element 66 comprises a support structure 68, which is supported against the support surface 62 of the adjusting arm 64, and a shaft 70, which is used to attach the support structure 68 to the rocker bearing structure 56. The shaft has two end portions 72, one of which is inserted into the rocker bearing structure 56 and the other of which is used to support the support structure 68. The support structure 68 has a first locking hole 80 and the shaft 70 has a second locking hole 81. Furthermore, the adjusting element 66 comprises a locking pin 82, which is inserted through the first locking hole 80 into the second locking hole 81 of the shaft 70, in order to lock the support structure 68 to the rocker bearing structure 56 via the shaft 70. It is preferred that the adjusting element 66 is made of two separate parts, i.e. the support structure 68 and the shaft 70, so that whenever the position of the adjusting element 66 is changed, only the support structure 68, which is in contact with the support surface 62 of the adjusting arm 64, needs to be released and rotated, while the shaft 70 remains in place attached to the rocker bearing structure 56. The support structure 68 forms a counter support surface 71, which is supported against one or more support surfaces 62 of the adjusting arm 64.

[0048] Another advantage of the adjustment element 66 being made of two separate parts is that the parts can be made of different materials, allowing for a more economical choice of materials. By using two different materials, it is also possible to avoid the two parts from seizing.

[0049] Preferably, the shaft is made of duplex or martensite steel, the support structure is made of acid-resistant steel, and the locking pin is made of high-strength brass or bronze. These materials have been found to have sufficient strength to withstand the forces acting on them and to be resistant to the harsh environment of heat and chemicals acting on the structure. Other materials can also be used, taking into account the requirements of the operating environment.

[0050] As shown in Fig. 1 1, the support structure 68 is preferably a nut having an eccentric support portion 73 in which the counter support surfaces 71 of the adjustment element 66 are formed and a flange 75 for laterally supporting the adjustment element 66. The flange is preferably a symmetrical structure. The eccentricity of the adjustment element 66 is formed at the eccentric support portion 73, in which, in each counter support surface 71, the counter support surface 71 is at a different distance from the centre point c of the shaft 70. In other words, for each counter support surface 71, the length of the straight line L perpendicular to the plane of the counter support surface 71 and passing through the centre point c of the shaft 70 is different. For example, in the octagonal support portion 73 shown in Fig. 1 1, the diameter of the eccentric support portion 73 can be 100 mm, and each counter support surface 71 is at a different distance from the centre point c of the shaft, for example, 45, 46, 47, 48, 55, 54, 53 and 52 mm, respectively. The eccentricity e1 to e8 of each counter support surface is different. In other words, the adjustment element is asymmetrical. Preferably, the flange and the shaft each have a circular cross-section. Figure 4 Figure 6 There can be at least two separate, preferably 4 to 10, most preferably 8, alternative counter support surfaces 71. In Figs. 1 1 and 12, the eccentric support portion 73 of the adjustment element 66 comprises 8 separate counter support surfaces 71, each of which corresponds to a different position of the convexly shaped element when placed against one or more support surfaces 62 of the adjustment arm 64. For example, the eccentric support portion 73 can cause the following settings of the convexly shaped element: 0°; +0.1 °; +0.2°; +0.3°; +0.4°; +0.5°; +0.6°; and +0.7°.

[0051] There can be at least two separate, preferably 4 to 10, most preferably 8, alternative counter support surfaces 71. In Figs. 1 1 and 12, the eccentric support portion 73 of the adjustment element 66 comprises 8 separate counter support surfaces 71, each of which corresponds to a different position of the convexly shaped element when placed against one or more support surfaces 62 of the adjustment arm 64. For example, the eccentric support portion 73 can cause the following settings of the convexly shaped element: 0°; +0.1 °; +0.2°; +0.3°; +0.4°; +0.5°; +0.6°; and +0.7°. Figure 3 Figure 6 There can be at least two separate, preferably 4 to 10, most preferably 8, alternative counter support surfaces 71. In Figs. 1 1 and 12, the eccentric support portion 73 of the adjustment element 66 comprises 8 separate counter support surfaces 71, each of which corresponds to a different position of the convexly shaped element when placed against one or more support surfaces 62 of the adjustment arm 64. For example, the eccentric support portion 73 can cause the following settings of the convexly shaped element: 0°; +0.1 °; +0.2°; +0.3°; +0.4°; +0.5°; +0.6°; and +0.7°.

[0052] ​​The advantage of using a flat counter support surface is that, since the support portion is dimensioned to correspond to the dimension of the slot of the adjustment arm, the flat counter support surface can counteract the tendency of the adjustment element to rotate about the shaft. The shaft acts as a pivot point when the eccentricity of the counter support surface acts as a torque arm and the adjustment arm transmits the force of the shaft to the adjustment element.

[0053] Figure 4 A horizontal cross-section of the adjustment element 66 is shown. The support portion of the support structure 68 of the adjustment element 66 is preferably a hollow structure, which is arranged on top of the end portion 72 of the shaft 70. Thus, the eccentric support portion 73 of the support structure 68 is supported on the shaft 70 by a large surface area, providing a rigid and reliable connection.

[0054] Preferably, the adjustment element 66 is supported on the rocker bearing structure 56 by means of a support frame 74 attached to the rocker bearing structure 56. Bolts can be used to attach the support frame 74 to the rocker bearing structure 56. Since one end of the shaft 70 of the adjustment element 66 fits into a third hole 86 formed in the rocker bearing structure 56, a part of the length of the shaft 70 extends outside the third hole 86. The large transverse forces generated by the adjustment arm 64 act on this part of the shaft 70. To counteract these forces, the adjustment element 66 is preferably also supported from the support structure 68 to the rocker bearing structure 56 by means of the support frame 74. More precisely, a flange 75 of the support structure 68 is supported on the support frame 74. To this end, the support frame 74 has a hole, which is both shaped and dimensioned to fit the flange 75 of the adjustment element 66. By means of the support frame 74, the adjustment element 66 can be supported from both ends, i.e. from two separate areas, thus eliminating any twisting of the adjustment element 66.

[0055] A cross-section of the support frame 74 is shown in Figure 4 The support frame 74 preferably forms a closed loop structure, into which the adjustment arm 64 and the adjustment element 66 fit. The support frame 74 comprises two axial parts 88 spaced apart from each other in the axial direction of the sleeve roll, and at least one transverse part 90 connecting the two axial parts 88 together. In Figure 4 In a preferred embodiment, two transverse parts 90 are provided, which are spaced apart from each other in the axial direction of the sleeve roll. The axial parts 88 and the transverse parts 90 form a closed loop structure, which can be attached to the rocker bearing structure 56, and which is very rigid. The adjustment element 66 extends through the support frame 74 and is supported by the support frame 74 at at least one area of the adjustment element 66, preferably at one end of the adjustment element 66. Preferably, there is also space between the adjustment arm 64 and the support frame 74 in the axial direction of the sleeve roll, so that the deflection or deformation of the bearing seat 54 does not generate any forces on the adjustment arm 64.

[0056] Preferably, the sleeve roller has a set of adjustment elements consisting of 2 to 6 of the aforementioned adjustment elements, each adjustment element having a different shape and eccentricity to achieve different positions of the convex forming element. If each adjustment element has 8 independent mating support surfaces, and each mating support surface differs from its adjacent mating support surface by 0.1 to 0.2°, then by preferably using three independent adjustment elements (each with a unique eccentricity range), an adjustment range of ±2° of the convex forming element can be achieved in the circumferential direction of the belt loop.

[0057] According to an alternative, the support portion of the adjusting element has a uniform and continuous mating support surface without a flat surface, the shape of which is designed such that the eccentricity of the mating support surface continuously changes. In other words, the support portion can be elliptical or other asymmetrical shapes, and Figures 3 to 5 The support shown is an octagon with flat, mating support surfaces. In this alternative embodiment, the support surface of the adjusting arm may need to have interchangeable curved support surface portions, each curved support surface portion corresponding to a specific curvature of the support portion of the adjusting element. This may be necessary to prevent the adjusting element 66 from rotating unintended under the torque applied by the adjusting arm 64.

[0058] An embodiment with a flat mating support surface is preferred over an embodiment with a uniform and continuous mating support surface because when a uniform curved shape is used, the contact area between the mating support surface and the support surface of the adjusting arm is very small, resulting in significant surface pressure on the mating support surface. A flat mating support surface, on the other hand, has a much larger surface area, resulting in lower surface pressure, which is beneficial for improving the robustness and wear resistance of the adjusting element.

[0059] Preferably, the support frame 74 further includes two rotating support members 84 (e.g., Figure 4 As shown, the rotating support members are disposed on both sides of the adjusting arm 64, with the adjusting arm located between the axial components 88 of the support frame 74. The rotating support members 84 are rotatable to support the adjusting arm 64 to maintain its position when the adjusting element 66 is released. This primary adjustment is achieved by rotating the shaft beam using an external force (such as using a crane or other type of external force). In other words, when the adjusting element is released, the rotating support members abut against the adjusting arm to form a temporary support surface. It should be noted that when the adjusting element is locked back into place, the rotating support members 84 move away from the adjusting arm 64 and do not support the adjusting arm, or at least do not transmit any torque, during the operation of the sleeve roller.

[0060] In embodiments using only a single adjusting element, the use of a support frame is particularly advantageous. Since a single adjusting element must bear the force independently, it is preferable to use a support frame to support the adjusting element from two regions.

[0061] The adjustment of the convex forming elements can be carried out in the following steps. The first step is to loosen the locking of the support structure 68 of the adjustment element 66 by unscrewing the locking pin 82. As shown in Figure 4 and Figure 5 The locking pin 82 is preferably a bolt which is screwed into a counter-thread (not shown) formed in the shaft 70 and can be loosened by turning the locking pin 82. The shaft 70 itself can also be screwed into the rocker bearing structure 56. Once the locking pin 82 is unscrewed, the support structure 68 can be pulled away from the shaft 70 in the axial direction of the shaft 70. For this purpose, a separate pulling tool can be used which has a thread corresponding to the thread of the support structure 68.

[0062] After the support structure 68 has been pulled to the periphery of the support surface 62, preferably the slot 76, of the adjustment arm 64, the shaft beam 28 and the adjustment arm 64 can be rotated around the bearing block 54, for example by using a crane or Figure 4 The shaft beam 28 and the adjustment arm 64 can be rotated around the bearing block 54, for example by using a crane or a rotating support 84 as shown in order to adjust the position of the convex forming elements 22. Once the adjustment has been completed and the desired position of the forming elements has been reached, the support structure 68 of the adjustment element 66 is rotated into the corresponding position so that the eccentric support 73 of the support structure 68 is aligned with the support surface 62 of the adjustment arm 64. Subsequently, the support structure 68 is pushed back into contact with the shaft 70 and with the support surface 62 of the adjustment arm 64 and is locked in place using the locking pin 82.

[0063] It should be understood that the order of the rotation of the adjustment element and the rotation of the adjustment arm can also be carried out in the reverse order.

[0064] It should be understood that the adjustment of the position of the shaft beam is only carried out when the forming section is not in operation.

[0065] According to an embodiment, the sleeve roll can also have more than one adjustment device for adjusting the forming elements. A single end of the sleeve roll can have two adjustment arms and a respective adjustment element for each adjustment arm. Alternatively, both ends of the sleeve roll can have an adjustment device. However, it is preferred that the adjustment device is not present at the end of the sleeve roll where the drive device of the roll is arranged, since the space there is very limited and difficult to maintain. The use of two adjustment arms and adjustment elements at one end can be used to reduce the surface pressure between the support surface of the adjustment arm and the counter support surface of the adjustment element.

[0066] According to yet another alternative embodiment, the adjustment device can be realized using an adjustment arm, which is provided with two support surfaces at its two sides and which is equipped with two adjustment elements on its two sides to lock the adjustment arm between the two adjustment elements. However, the implementation of this alternative embodiment is more expensive compared to the preferred embodiment using one adjustment element and an adjustment arm with a slot, since it requires two adjustment elements and is more complex to use due to the need for the rotation of two adjustment elements.

[0067] The sleeve roll diameter is preferably 700 to 1600 mm, and the length of the adjustment arm can be 350 to 700 mm.

Claims

1. A sleeve roll for a wire section of a fibrous web machine, the sleeve roll (21) comprising: a shaft beam (28) with a shaft column (53) supported in a bearing housing (54) equipped with a rocker bearing structure (56), two circular roll heads (29) supported on the shaft beam (28) and arranged to rotate, a belt loop (30) arranged around the shaft beam (28) and tensioned between the roll heads (29), a convexly shaped forming element (22) attached to the shaft beam (28) and arranged between the shaft beam (28) and the belt loop (30), wherein the forming element (22) is in contact with the belt loop (30) to form an ascending pressure for water removal, and an adjustment device (60) configured to lock the shaft beam (28) in place after adjustment of the forming element (22), the adjustment device (60) comprising a ring-shaped adjustment arm (64) with a support surface (62) attached to the shaft column (53), characterized in that the adjustment device (60) further comprises an eccentric adjustment element (66) that is articulated to the rocker bearing structure (56) for supporting the adjustment arm (64) in place, the eccentric adjustment element (66) being lockable in place relative to the rocker bearing structure (56) to lock the adjustment arm (64) and releasable to change the position of the adjustment arm (64).

2. The sleeve roll of claim 1, wherein, The eccentric adjustment element (66) is designed in shape to support the adjustment arm (64) in different positions in different rotational orientations of the eccentric adjustment element (66).

3. Sleeve roll according to claim 1 or 2, characterized in that The eccentric adjustment element (66) comprises: a support structure (68) supported against the support surface (62) of the adjustment arm (64), the support structure (68) having a first locking hole (80), a shaft rod (70) for attaching the support structure (68) to the rocker bearing structure (56), the shaft rod having two end portions (72) and a second locking hole (81), and a locking pin (82) inserted in the first locking hole (80) and the second locking hole (81) to lock the eccentric adjustment element (66) to the rocker bearing structure (56).

4. The sleeve roll of claim 3, wherein, At least the support surface (62) of the adjustment arm (64) is made of acid-resistant steel, and the eccentric adjustment element (66) is made of high-strength brass or bronze to avoid jamming of the eccentric adjustment element (66).

5. Sleeve roll according to claim 3 or 4, characterized in that The eccentric adjustment element (66) has at least two separate, preferably 4 to 10, most preferably 8 alternative pairings of support surfaces (71) for arrangement against the support surface (62) at selected orientations of the eccentric adjustment element (66).

6. The sleeve roll of claim 5, wherein, Each pairing of support surfaces (71) has a separate eccentricity.

7. Sleeve roll according to claim 5 or 6, characterized in that Each pairing of support surfaces (71) is a plane perpendicular to the radial direction of the shaft rod of the eccentric adjustment element (66).

8. The sleeve roll of any one of claims 2 to 7, wherein, The sleeve roll (21) has a set of eccentric adjustment elements (66) consisting of 2 to 6 eccentric adjustment elements (66), each eccentric adjustment element (66) having a different shape to achieve different positions of the convex forming element (22).

9. The sleeve roll of claim 8, wherein, The set of eccentric adjustment elements (66) is arranged to achieve a ±2° adjustment of the convex forming element (22) in the circumferential direction of the belt ring (30) in steps of 0.1 to 0.2°.

10. The sleeve roll of any one of claims 1 to 9, wherein, The adjustment device comprises a support frame (74) attached to the rocker bearing structure (56) for supporting the eccentric adjustment elements (66) from one end (72) to the rocker bearing structure (56) and from the other end (72) to the support frame (74).

11. The sleeve roll of claim 10, wherein, The support frame (74) has axial parts (88) with a space for the adjustment arms (64) and the support frame (74) between them and transverse parts (90) attached to the axial parts (88) to form a support for the shafts (70) of the eccentric adjustment elements (66).

12. The sleeve roll of claim 11, wherein, The support frame (74) has two rotating supports (84) arranged on both sides of the adjustment arms (64) between the axial parts (88) of the support frame (74), the rotating supports (84) being rotatable for supporting the adjustment arms (64) during rotation of the eccentric adjustment elements (66).

13. The sleeve roll according to any one of claims 3 to 12, characterized in that The support structure (68) comprises eccentric support parts (73) supported against support surfaces (62) of the adjustment arms (64) and flanges (75) supported against the support frame (74).

14. The sleeve roll of any one of claims 1 to 13, wherein, The support surfaces (62) are slots (76) formed in the adjustment arms (64) in the radial direction of the sleeve roll (21) and the eccentric adjustment elements (66) are arranged to fit inside the slots (76) when the adjustment arms (64) are locked in place.

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