阅读说明：本技术 用于纤维幅材机的网部的衬套辊 (Bush roll for a wire section of a fiber web machine ) 是由 维莱·埃罗宁 塞波·库皮艾宁 A·米蒂宁 T·西洛玛 约尔马·斯内尔曼 尤哈·温帕里 塔 于 2021-05-19 设计创作，主要内容包括：本发明涉及一种用于纤维幅材机的网部的衬套辊。所述衬套辊(21)包括固定轴(28)以及两个圆形的辊头(29),所述辊头被支撑在固定轴(28)上并且被布置成旋转。所述衬套辊(21)还包括带环(30),所述带环围绕固定轴(28)布置且在辊头(29)之间张紧。还有布置在固定轴(28)与带环(30)之间的曲线形的成形元件(22)。所述成形元件(22)与带环(30)接触,以形成用于脱水的升高压力。在带环(30)的旋转方向上,在成形元件(22)之前,具有润滑的滑动表面(31),所述滑动表面用于织物支撑和成形元件(22)的润滑。(The invention relates to a bushing roll for a wire section of a fiber web machine. The bushing roller (21) comprises a stationary shaft (28) and two circular roller heads (29) supported on the stationary shaft (28) and arranged to rotate. The bushing roller (21) further comprises a belt loop (30) which is arranged around the fixed shaft (28) and tensioned between the roller heads (29). There are also curvilinear shaped forming elements (22) arranged between the fixed shaft (28) and the belt loop (30). The forming elements (22) are in contact with the belt loop (30) to create an elevated pressure for dewatering. In the direction of rotation of the belt loop (30), before the forming elements (22), there are lubricated sliding surfaces (31) for fabric support and lubrication of the forming elements (22).)

1. A bushing roll for a wire section of a fiber web machine, the bushing roll (21) comprising:

a fixed shaft (28),

two circular roller heads (29) supported on the stationary shaft (28) and arranged to be rotatable,

a belt loop (30) arranged around the fixed shaft (28) and tensioned between the roller heads (29), an

A curved shaped element (22) arranged between the stationary shaft (28) and the belt loop (30),

wherein the forming elements (22) are in contact with the belt loop (30) to form an elevated pressure for dewatering, characterized in that in the direction of rotation of the belt loop (30) before the forming elements (22) there is a lubricated sliding surface (31) for fabric support and lubrication of the forming elements (22).

2. A bushing roller according to claim 1, characterized in that the sliding surface (31) has a curvature (R) corresponding to the radius of the roller head (29).

3. A bushing roller according to claim 1 or 2, characterized in that the sliding surface (31) delimits an area (32) of 30 to 120 degrees.

4. A bushing roller according to any of claims 1-3, characterized in that before the sliding surface (31) there are showers (33) for lubrication.

5. A bushing roller according to any of claims 1-4, characterized in that the sliding surface (31) is equipped with one or more fluid pockets (35).

6. A bushing roller according to any of claims 1-5, characterized in that before the shaping element (22) there is an additional fluid shower (40).

7. A bushing roller according to any of claims 1-6, characterized in that there is a fluid collector (38) before the sliding surface (31) or the forming element (22).

8. A bushing roller according to claim 7, characterized in that the fluid collector (38) has at least one edge (39) which is arranged as a part of the sliding surface (31).

9. Bushing roller according to claim 7 or 8, characterized in that the fluid collector (38) has a return connection (41) to a central hole (34) for removing lubricant from the bushing roller (21), which central hole is arranged to the stationary shaft (28).

10. A bushing roller according to any of claims 1-9, characterized in that the roller head (29) is equipped with a tensioning device (42) and the central hole (34) arranged to the stationary shaft (28), the tensioning device (42) having a hydraulic conductor (43) inside the stationary shaft (28).

11. A bushing roller according to any of claims 1-10, characterized in that the roller head (29) has bearings (46) with separate lubrication.

12. A bushing roller according to any of claims 1-11, characterized in that the shaping element (22) is arranged to be tiltable and/or movable relative to the stationary shaft (28) for locally pushing the belt loop (30) outwards from its circular shape.

13. A lining roller according to any one of claims 1 to 12, characterised in that the inside of the lining roller (21) is at overpressure.

14. A bushing roller according to any of claims 1-13, characterized in that the cross-section of the stationary shaft (28) is polygonal.

15. A lining roller according to any one of claims 1-14, characterized in that the end of the stationary shaft (28) has a rocker bearing (54) and that between the stationary shaft (28) and a bearing bracket (56) belonging to the rocker bearing (54) there is a rotation means (55).

Technical Field

The invention relates to a bushing roll for a wire section of a fiber web machine, comprising: a fixed shaft; two circular roller heads supported on the stationary shaft and arranged to rotate; a belt loop disposed around a fixed shaft and tensioned between the roller heads; and a curved forming element arranged between the stationary shaft and the belt loop, wherein the forming element is in contact with the belt loop to form a rising pressure (rising pressure) for water removal.

Background

European patent No. 2350385 discloses a forming section of a fiber web machine. There is a bushing roller having a belt loop arranged to rotate around a fixed shaft. Inside the bushing roller, there are curved shaped elements that form the dewatering areas. The increased pressure pushes water out of the fiber web formed by the fiber web machine, such as a paper machine, a board machine, a pulp machine or a consumer machine.

The known forming elements are large-piece structures (massive structuring) with a large contact area with the belt loop. Even with lubrication, friction is significant. In particular, when the forming section is activated, the belt loops may stick to the forming elements. The shaft includes a lubricant reservoir and the lubricant is returned after use. Friction heats up the lubricant, so the amount of lubricant must be large. This increases the total weight of the bushing roller, but the heating problem still remains. Furthermore, known bushing rollers must be aligned in a specific position.

Disclosure of Invention

It is an object of the invention to provide a bushing roller for a wire section of a fiber web machine, which bushing roller is more operational and more versatile than before. Moreover, the manufacture and use of the bushing roller is simpler and cheaper. The characteristic features of the bushing roller according to the invention are stated in the present application. The liner roll has a novel and unexpected structure and function, thereby solving the problem. The bushing roll is easy to apply in fiber web machines with various formers and for various fiber webs to be formed. The first installation is simple, but the bushing roller can also be retrofitted with very small modifications.

The application provides a bushing roller for a wire section of a fiber web machine, the bushing roller comprising: a fixed shaft; two circular roller heads supported on the fixed shaft and arranged to be rotatable; a belt loop disposed around the fixed shaft and tensioned between the roller heads; and a curvilinear forming element disposed between the stationary shaft and the belt loop, wherein the forming element contacts the belt loop to create an elevated pressure for dewatering. In the band. In the direction of rotation of the forming element. Previously, there were lubricated sliding surfaces. For the fabric support and the forming element. Lubrication of (3).

Further, the sliding surface has a curvature corresponding to a radius of the roller head.

Further, the sliding surface defines an area of 30 to 120 degrees.

Further, before the sliding surface, there is a shower for lubrication.

Further, the sliding surface is provided with one or more fluid pockets.

Further, there is an additional fluid shower before the forming element.

Further, there is a fluid collector before the sliding surface or the shaping element.

Further, the fluid collector has at least one edge arranged as part of the sliding surface.

Further, the fluid collector has a return connection to a central bore for removing lubricant from the bushing roller, the central bore being arranged to the stationary shaft.

Further, the roll head is equipped with a tensioning device having a hydraulic conductor inside the stationary shaft and the central bore arranged to the stationary shaft.

Further, the roll head has bearings with separate lubrication.

Further, the shaping elements are arranged to be tiltable and/or movable relative to the stationary shaft for locally pushing the belt loop outwards from its circular shape.

Further, the inside of the liner roll is at overpressure.

Further, the fixed shaft is polygonal in cross section.

Further, the end of the fixed shaft has a rocker bearing, and a rotating device is provided between the fixed shaft and a bearing bracket belonging to the rocker bearing.

Drawings

The invention is described in detail below with reference to the accompanying drawings showing some embodiments of the invention, wherein:

figure 1 shows a schematic side view of a forming section equipped with a bushing roller according to the invention,

figure 2 shows a cross-sectional view in the transverse direction of a bushing roller according to the invention,

figure 3 shows a schematic view of a bushing roller according to the invention without a belt loop,

fig. 4 shows a partial cross-sectional view in the machine direction (machine direction) of a bushing roller according to the invention.

Detailed Description

In the shown embodiment the forming section comprises a first wire loop 10 and a second wire loop 11 (fig. 1). The first wire loop 10 surrounds the forming roll 12 and the second wire loop 11 surrounds the breast roll 13. The direction of travel of the first wire loop 10 is indicated by arrow 14 and 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 so that both the wire loops 10 and 11 converge on the area of the forming roll 12. The forming section also comprises a headbox 17 for feeding a pulp suspension to the gap 16 between the wire loop 10 and the wire loop 11. After the forming roll 12, there are three suction boxes 18, 19 and 20 for water removal. There follows a lining roll 21 according to the invention. Both the wire loop 10 and the wire loop 11 travel past a bushing roll 21 equipped with curved forming elements 22 for dewatering. The bushing roll 21 is followed by a twin-wire section on which water is removed from the fibrous web 23 travelling between the wire loop 10 and the wire loop 11 by means of a pair of suction boxes 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 diverted by means of the second guide roll 25 and led to a return circulation. At the location of the second guide roll 25 the second wire loop 11 is separated from the first wire loop 10, in connection with which the fibre web 23 is attached to the first wire loop 10 by means of another suction box 26 and is transferred on the upper surface of the first wire loop 10 over a third guide roll 27 and then picked up to the subsequent press section.

Fig. 2 shows a cross-sectional view in the transverse direction of a bushing roller 21 according to the invention. As mentioned above, a bushing roller is used in the wire section of a fiber web machine. The bushing roller 21 comprises a stationary shaft 28 and two circular roller heads 29 with journals 53 (fig. 4) supported on the stationary shaft 28 and arranged to rotate. Each roll head is circular with a fixed radius. Furthermore, the lining roller 21 comprises a belt loop 30 arranged around the fixed shaft 28 and tensioned between the roller heads 29. The circular roller head 29 forms the belt loop 30 into a cylindrical shape, particularly when tensioned and rotated. The belt loop 30 can then be rotated about the fixed shaft 28. Furthermore, between the stationary shaft 28 and the belt loop 30, curved shaped elements 22 are arranged. The forming elements 22 are brought into contact with the belt loop 30 to create an elevated pressure for water removal. In the present invention, the forming elements push the belt loop 30 locally outwards from its circular shape to follow the forming elements of smaller radius. The curved shape of the forming element varies with decreasing radius, either continuously or in steps.

According to the invention, in the direction of rotation of the belt loop 30, in front of the forming element 22, there is a lubricating sliding surface 31 for belt and fabric support and lubrication of the forming element 22. The net rings 10 and 11 then both have good support. The wire loop is able to drive the belt loop by bearing on a sliding surface for fabric tension wrap (fabric wrap). Simultaneously, the friction between the sliding surface and the belt loop remains low. Also, as the lubricant travels with the belt loop, the forming elements are lubricated simultaneously. The sliding surface 31 is here a metal or metal plate structure supported on the shaft 28 (fig. 2). In principle, the sliding surface may be part of a stationary shaft.

Advantageously, the sliding surface 31 has a curvature R corresponding to the radius of the roller head 29. The belt loop and the wire loop then run smoothly together with low friction but good support. After the sliding surfaces, the forming elements push the belt loop outwards so that the fabric and the web follow the smaller radius of the forming elements, causing an elevated pressure (winding pressure) that effectively removes water from the fibrous web. In fig. 2, the belt loop 30 is shown in dashed lines in an undriven cylindrical shape and in solid lines on the pushed forming element. When rotated, the belt loop has a continuous deformation that can be manipulated by newly developed belt materials and structures.

The sliding surface 31 defines an area 32 of 30 to 120 degrees. In fig. 2, the area 32 is about 80 degrees. Even such large areas are possible by maintaining a low friction new type of lubrication. Here, before the sliding surface 31, there is a shower 33 for lubrication. In the present invention, lubricant is supplied through the central bore 34 of the stationary journal and is subsequently also drawn out through the central bore 34. The central hole is explained in more detail in connection with fig. 4.

Fig. 3 shows the basic components of the liner roll 21, but only a part of the profile of the belt loop 30 itself. According to the invention, the sliding surface 31 is equipped with one or more fluid pockets 35. The size of the pockets may vary from a single hole counter sink to a long channel with several feed openings extending in the axial direction of the liner roll. The fluid pockets are arranged in rows of several pockets per row, and the rows of lubrication pockets can be individually controlled and used. For example, in start-up and/or run-up modes, a different number of rows participate in lubrication. Lubricant is supplied to these fluid bags. Then, especially during start-up, lubricant is spread from the fluid bag between the sliding surface and the belt loop, so that there is a continuous oil film over all surface areas. Then the belt loop is no longer attached and the belt loop can start to rotate in a low friction manner like hydrostatic lubrication. In fig. 3, there are three fluid bags 35 in different positions of the sliding surface 31. Each fluid pouch is narrow and extends axially. In other words, the fluid pockets are long in the axial direction and short in the machine direction. With at least one row of fluid pockets, or a single long axial fluid pocket. Thus, the lubricant is supplied over the entire width of the sliding surface. In fig. 2, there is one fluid pocket 35 formed on the sliding surface 31. Below the sliding surface 31, there is a manifold 36 extending axially over the area of the fluid pocket. Then, the lubricant is uniformly dispersed throughout the sliding surface. In fig. 3, there are three manifolds 36, i.e. one for each fluid bag 35. Lubricant may be supplied to the manifolds at their inlets via a single conduit 37 (fig. 4).

The shower 33 is positioned in front of the sliding surface 31 and the lubricant is supplied, in particular during normal operation in which hydrodynamic lubrication is established. The shower extends axially over the width of the sliding surface. Thus, the lubrication during operation can be performed by means of a shower immediately before the sliding surface or by means of one or more first pocket arrangements at the beginning of the sliding surface. Operational lubrication can also be provided by a combination of fluid pockets and lubrication tubes to provide more lubrication and cooling. According to the invention, a fluid collector 38 is provided before the sliding surface 31 or the shaping element 22. The location of the fluid collector depends on how the liner roll is mounted. In fig. 2 and 3, the fluid collector 38 is located before the forming element 22. The excess lubricant is then collected prior to forming element 22. The fluid collector should be covered with lubricant to achieve efficient removal of the lubricant. Too much air entering the outlet duct can impair the efficiency of the removal.

In the embodiment shown, the fluid collector 38 has at least one edge 39 which is arranged adjacent to and between the sliding surface and the profiled element. In other words, the fluid collector is integrally formed next to the sliding surface and a portion of the fluid collector can be attached to the shaped element. This makes the structure effective in each drive mode. The fluid collector 38 is rigidly attached to the axle beam 52, or the fluid collector moves at least partially with the forming element 22, or the fluid collector is divided into the two separate parts. It may also be at least partially tiltable. The fluid collector then follows the movement of the forming element. This avoids splashing of the lubricant when the fluid collector is always in the correct position with respect to the forming element. In other machine layouts and alignments of the liner rolls, there may be additional fluid showers 40 before the forming elements 22. Lubrication between the forming element and the belt loop will then be ensured.

As shown in fig. 4, the fluid collector 38 has a return connection 41 to the central bore 34, which is arranged relative to the shaft 28, for removing lubricant from the bushing roller 21. The lubricant is then drawn from the bushing roller to be filtered and cooled. In this way, the amount of lubricant inside the lining roller is minimized, thereby reducing the weight of the lining roller. Moreover, the lubricant is cooled when it is supplied again through the showers and the fluid bags, both of which ensure a longer service life of the belt made of reinforced polymeric structure susceptible to overheating and wear damage. On the other side of the lining roller there is another return connection 41. Here a pump for removing lubricant before a shutdown.

Tensioning the belt loop by axially moving at least one roller head. Here, the roller head 29 is equipped with a tensioning device 42 having a hydraulic transmitter 43 located inside the shaft 28 and a central bore 34 arranged relative to the shaft 28. The structure is simple and the tension of the belt loop can be adjusted accurately and separately from other adjustments of the bushing roller. Here, the tensioning device 42 is a double acting cylinder connected to the roller head 29. The roller head is divided into two parts. The first part is an inner ring 44 which is non-rotating but axially slidable. The second part is an outer ring 45 which is rotated by a bearing 46. Thus, the belt loop can be adjustably tensioned even during rotation. For example, in the case of a lubricant that starts cold, the tension may be lower. Then, after production has started and the forming elements have been pushed, the tension can be adjusted to optimize the runnability of the bushing roller and the whole forming section.

There is another new feature in the roller head. According to the invention, the roller head 29 has bearings 46 with separate lubrication. In other words, the lubrication of the bearings is separate from the lubrication of the sliding and shaped elements. Thus, different lubricants can be used, and harmful contaminants will not end up going from one lubricant to another. For example, metal particles from the bearing end up not between the forming element and the belt loop. This extends the service life of the bushing roller. Here, the lubricant is supplied via a tube 47 mounted in the central bore 34 (fig. 4).

In fact, the size and shape of the shaped elements are new per se. Furthermore, according to the invention, the shaping element 22 is arranged tiltable and/or movable with respect to the shaft 28. In the embodiment shown, the forming element is pivoted at its front end and it is pushed against the belt loop 30 by the hydraulic device 48. In addition, the hydraulic pressure is guided via the central bore as described above. There are significant forces that require several parallel hydraulics 48 (fig. 4). In the central bore 34 there is first a rigid tube 59 and then a steel braided hose 49 which leads pressurised oil to and from the double acting hydraulic device 48. If some movement or deformation occurs, the hose flexes. Steel braided hoses are also advantageous for other lubricant supply and removal arrangements inside the bushing roller.

Following the tube 47 is a conduit 37 for supplying lubricant to the fluid bag 35. The third is a rigid tube 59 for the hydraulic device 48 that moves the forming element 22. The fourth is a hydraulic conductor 43 for the tensioning device 42. There is then a fitting 50 for supplying compressed air to the interior of the bushing roller to assist in the removal of the lubricant. When the fluid collector is filled with lubricant, the lubricant can be pumped out of the liner roller. Advantageously, the inside of the lining roll 21 is at overpressure (overpressure). The pressure assists in the removal of the lubricant and keeps the bushing roller round. To close the bushing roller, there is a seal 51 at the end of the shaft 28.

The stationary shaft comprises a shaft beam 52 with two journals 53. Here, the cross section of the axle beam 52 is polygonal. Thus, the axle beam is rigid and can be placed at any angle. At least partly, advantageously overall, there are at least six rounded lobes and the sides of the axle beam can have different lengths to better fit the equipment inside the lining roll.

By the position of the shaping elements, the lining rollers have a good possibility to change the shaping process. Here, the end of the shaft 28 also has a rocker bearing 54, and a rotation device 55 is provided between the shaft 28 and a bearing bracket 56 belonging to the rocker bearing 54. Thus, the alignment of the liner rollers can be finely adjusted. In this way, wear of the belt loops and wire loops is minimized and water removal is maximized. This rotation during start-up is shown in fig. 1.

The shaping element is convex and it protrudes from a circular band. By pushing the forming element, the belt loop is tensioned both in the machine direction and in the cross-machine direction without the intervention of further rollers. The maximum value of the projection of the shaped element is advantageously less than 120mm, advantageously between 50mm and 90 mm. The sliding surface can also be arranged inwards from the belt radius to form a retracted support for the belt loop, which reduces the amount of outward protrusion of the forming elements. The arrangement reduces the local elongation of the belt and can help increase the useful life of the belt. Preferably, the indentation of the sliding surface is less than 40 mm. The retraction of the forming elements inside the circumference of the belt loop reduces the friction when the forming section is activated. The convexity of the profiled element is greater in the direction of travel, which means that the radius is shorter. The change in radius may be continuous or may be stepwise, having 3 to 12 steps of radius, advantageously 5 to 9 steps. These variations or steps help to adjust the pressure profile affecting the fibre web. In the cross-machine direction, the edge regions in both ends of the forming element have a radius equal to or greater than the smallest radius in the machine direction. The axial distance between the straight portion of the shaped element and the roll headband locking portion (locking) is 150mm to 800 mm. Advantageously, the forming element is divided into two parts. The first part is a base part 57 which is pivoted to the shaft 28. The second part is a contact part 58 which is replaceably secured to the base part 57. Thus, the characteristics of the liner roll can be adjusted simply by changing the contact portion. The shaping element may comprise one or more fluid pockets (not shown).

Before the forming element, there is a fabric tension wrap on the liner roll, which fabric tension wrap is manipulated according to the invention through a lubricated sliding surface before the forming element. The forming elements are also lubricated by fluid bags and/or fluid showers associated with the sliding surfaces. The sliding surface and the forming element together form a friction surface in the area around which the fabric is tensioned. The wrap against the liner roll is advantageously 30 to 120 degrees. The sliding surface has approximately the same radius as the roller head, which keeps the belt loop taut and keeps it on its circular path. When properly engaged, the sliding surfaces make the shaft more rigid against bending. Furthermore, the sliding surfaces are lubricated against friction and there is a lubricating shower before and/or through (through) the sliding surfaces. The tube of the lubrication shower in front of the sliding surface forms a kind of lubrication pocket by closing the oil path against the belt rotation. During wrapping on the sliding surface, the tension of the fabric against the belt loop on the sliding surface places a driving force to the bushing roller.

The axle beam is made of a hollow polygonal and/or circular beam structure that provides support for the forming elements and other devices and has space for the equipment inside the belt loop. The axle beam is preferably made of a polygonal, say 6 to 12 rounded, beam structure with a journal attached thereto. The polygonal shape results from a bent metal plate which is welded together by at least two pieces. The fixed polygonal axle beam is rigid for large angles of tension from both the belt loop with forming element protrusions and fabric wrap. Surprisingly, both simple square beams and high I-beams for press nips are not good for liner roll solutions with different force angles. The metal sheet thickness is advantageously 30mm to 60 mm. For load requirements and for space for assembling the device, the polygonal structure is advantageously symmetrical in different planes. For example, the beam may be slightly higher in the top tension direction of the profiled element, and may be slightly narrower for accommodating said sliding surface. The axle may have an opening and hatch for access to equipment inside the axle beam.

The roller head is supported by a slide from a fixed journal. There are means for axially moving the roll head, advantageously hydraulic cylinder means, attached to the roll head and located inside the axle beam. There is also an indexing means (indexing means) which is connected to the rocker bearing outside the roll head. The alignment of the liner roll can then be adjusted. At least one of the roller heads has an opening through the journal for lubricant inlet and outlet. The opening is sealed to enable the gas pressure inside the belt to be increased.

There are rotating means for the lining rollers for fine adjustment of the angle of projection of the forming elements. The device has a torque support from a solid machine structure and the other end is attached to a rotationally symmetric journal. A rotating device, such as a screw, a turnbuckle screw or a worm gear, can be used as the turning device, since it can maintain its position when no control force is applied. The bushing roller diameter is advantageously 700mm to 1600 mm.

The lubricant is a fluid, preferably an oil. It is also possible to use compressed air, or a mixture of air and oil, or even water, especially in the case of fluid bags with sliding surfaces.