FI117013B - Roll for use with a drying section in a forming machine - Google Patents

Description

ROLLER FOR USING DRYING MACHINE DRYING PART

The invention relates to a roll for use in a web-shaped drying section through which a passage 5 is provided through the roll, which roll includes a diaper and bellows at both ends for supporting the roll from a rotating web and having a spacing or temperature difference thereto.

10

In particular, the drying section of the web forming machine has hollow rolls through which the web guided via the slalom path is carried forward. The spacers are spaced apart. In other words, it is about 15 positions. Structurally, the roll has a cylindrical cylinder with end-pieces mounted on its ends. At the end, the roll is supported on a forming machine p The drying section has mainly two types of hollow rolls, suction rolls and drying cylinders. These suction rolls 20 are also referred to as reverse suction rolls. The suction rolls are perforated v while hot steam is introduced into the drying cylinder. The drying cylinders heat the web therethrough and the suction rolls keep the web under control as a fabric k. . on the drying wire. The large shark of the drying section I / 25 suction roll is also referred to as the VAC roll, which is · · * l *. especially with single wire exports.

• · * • · 9 hours • * «• · ·" V It is known that both rolls use castings

• M

* ;;; having a thickness of several tens of millimeters. Store • · 30 is large, heavy and expensive. In particular, drilling holes in the sheath is also slow and the rollers 2 are vibrationally problematic due to their hollow r and high mass. On the other hand, due to the casting technique, it is difficult to enlarge the rolls further, which would be one way, for example, of raising the dryer bar 5.

It is an object of the invention to provide a new type of stamping roll used on the dryer section of the machine which is a lighter and more dynamically stable and has the disadvantages of the prior art. Embodiments of the present invention are apparent from the appended claim 1.

A particularly thin roll is used to achieve this by using thin sheet material which remains in a new and surprising way. The plate structure 15 also avoids cumbersome casting and p

The finished roll is also considerably lighter than conventional rolls. This reduces the amount of rotation needed and the roller can be supported with smaller bearings.

Significantly larger mass or vibration limits may be manufactured for you. In addition, thanks to its construction technology, the roll according to the invention is usable without machining. If necessary, use a fluid that can be machined to make the surface of the roll itself * · desired. Also, the end piece of the roll is u: 25 and utilizes rotary pieces and a plate girder • ψ • · · · · ··· ·

The invention will now be described in detail by vi * ·· '. ···. attached to the accompanying drawings, which illustrate some embodiments of the invention, wherein n is 3

Fig. 2a is an axon view of a roll according to the invention,

Figure 2b shows a sectional view of a roll shell according to the invention, Figure 3a shows a partial sectional view of a roll of the invention,

Figure 3b shows a third modification of the diaper according to the invention in partial section,

Fig. 4 shows a sectional view of a roll according to the invention. Fig. 5 shows a partial diameter of the roll end piece

Fig. 6a is a sectional view of an embodiment of a roll according to the invention,

Figure 6b shows a partial cross-sectional view of Figure A-A.

15

Figure 1a shows one set of cylinders which are several in succession in the drying section of a stripping machine. Known dispensing machines are, for example, paper and board machine corresponding machines. A group of cylinders consists of a succession of 20 ink cylinders 10 and suction rolls 11, through which the drying fabric 12 used is guided endlessly. with only one dryer wire per cylinder group • the web is dried by passing it between the dryer wire and the. Drying cylinder 1 • ·:. by introducing hot steam into it. The drying roller • · * · for tea in detail in figure 4. Correspondingly. ***. the web passes over a drying wire. Hainan Hall • «is used as a suction roller to provide a vacuum ai V» t Vl Loose Ί / 4 Λ. 4— vn Ij * -! -Ί V \ VN *! bil Ί Ί V rt ft rt rt 7 \ 1 -! vh rt 4 V * ft. A n 4 · ft ^ 4 4 15 is shown, in principle, in Fig. 1a - The vacuum * is produced in some known manner and applied to the rolls through the advanced lines.

Figure 2a is a perspective view of a roller according to the invention. Thus, as basic components, the roll comprises at both ends end portions 17 of the roll rotatably supported by a roll forming machine. One end cap embodiment is illustrated in more detail in Figure 5. Figure 2a 10 shows a suction roll with a perforated diaper 16. Individually illustrated by reference numeral 26. Outwardly, the cup according to the invention looks almost conventional, but its design is surprising. According to the invention, the sheath 16 is thus a thin sheet. In addition, a rigid 15 18 is provided inside the sheath 16 (Figure 2b). This avoids casting and restrictions. At the same time, the roll becomes lighter and more economical in vibration.

According to the invention, the stiffening structure is also a thin plate 20, whereby both the sheath and the stiffening structure can be made by means and methods. In practice, the thickness of the thin sheet is 1 to 5 mm, more preferably 2 to 4 mm. One. '. J material is a residual strain-free cold rolled • * .V. In this case, during and after cutting, the sheet metal body • *. : 25 straight and bending back the elasticity is small.

• ·:. ·. for example, composite structures can be used, already 9 »» «« »· .5. on the inner surface of the jacket. Composite structures are «· ·· / ··, but achieve a good stiffening effect. However, the lij * * can be easily assembled into a positive structure 4 5 However, the height of the rigid structure is at least 100 and the manufacturing methods are kept simple. The stiffener structure 18 consists of a plurality of stiffener blocks which are spaced apart. In addition, the ice sheet 5 comprises a stiffener profile which is attached to the inner surface. In Figure 2b, hat-shaped stiffening pieces 19 are provided on the inner surface of the thin sheath 16 Here, each piece 19 is bent from the sheet metal material and k on the inner surface of the sheath 16, for example by welding. The brackets 19 of the brochures 10 are advantageous for fastening, other stiffening pieces may be used, the stiffening pieces 19 at the left end of the sheath 16 are very close together. Instead, at the right end of the sheath 16, the pieces 19 are clearly separated. The size of the stiffener piece 15, as well as the distance, is dimensioned as needed to take the size of the roll and the application and purpose. Here, too, the stiffener pieces have perforations to ensure the propagation of the vacuum effect. The vacuum is introduced, for example, through the hollow cantilever shaft 20 (Fig. 20)

Another embodiment of the roll according to the invention is shown herein. The stiffening piece 19 consists of a circular ring: secured to the inner surface of the sheath 16. The circle ring is a single *, V. »» «• 9, ·,: 25 Non-perforated sheet material • * ·» m:. · can also be used to spread the vacuum effect unevenly. That • * ·. ·. furthermore, the outer surface of the jacket 16 has a coating 21 * * · **. grooves 22 for extending the vacuum effect widely.

* * drying wire. In other words, the grooves are LX 1 of the coating O Λ v \ λ w w λ ^ 4 a m ί.

6 thus deflects the stiffener pieces when the roll is loaded with a very rigid honeycomb structure. The simple intermediate support 23 consists of a cylindrical support. extending from one end of the roll to the other, which is k 5 for each spacer 23. On the other hand, longitudinal supports e may be used which are fixed to the circumference of the casing. In Fig. 3b, a cylindrical support piece is provided over the entire length of the sheath 10 and is secured to the mounting plate 25. In this case, the sheath can be manufactured differently to finally attach the end piece to the mounting plate. When used as a support, the cylinder shall have perforations or openings to allow the application of negative pressure to the area of the equal jacket. Thus, the stiffening pieces and / or the palm have a perforation or the like. On the other hand, when using sheet metal plate 15, the dimensioning and positioning of the holes can be more freely spaced. The vacuum effect can then be applied at different locations e on the roll. For example, other areas may be formed at the end portions <of the roll <, especially to control the edges of the web. Each t 20 of the roll to be used as a suction roll has a perforation by means external to the roll to align the roll provided inside the roll and further to the web.

9 9 9 Ψ Ψ 9 99 9 9

The roll of the invention can also be used for drying 9 9 9. · 25 shown in Figure 4. In the embodiment shown • · ·; the stiffening pieces 19 are circular rings, which are additionally * · · ** provided with a cylindrical support piece 24. Here, the stiffening pieces 19 are perforated, whereby

do not spread evenly over the area of the diaper 16. K

i ntprί n p 1 nn 1 ί ρρΙγρι ςί ρπππ 97 1 puhHovoHon 7

In the roller applications shown, s end pieces can be used, each of which is a Kennen according to the invention. The end piece 17 includes a separate insert body half having an inner hole 30 corresponding to the projection shaft 20 for the projection shaft 5. In addition, the end plate 17 end plate 28 can be manufactured with at least one plate piece 3, the different parts of the end piece can be manufactured separately, avoiding casting large parts, and machining parts can even be manufactured differently and with different materials. facilitates the manufacture of the end piece, the structure is formed as a hollow, whereby the end piece 15 is filled with insulator 33. In this case, especially for drying, heat loss through the end pieces can be prevented. For example, the dielectric is extruded scales evenly across the end piece and solidifies pa Function numbers of functionally similar parts are used.

Fig. 6a shows a roller dryer according to the invention; 10. Here again, the sheath 16 is made of sheet metal material. In addition

• M

The pale 17 is cup-shaped and welded to the • • ♦ 25 Thus, the mounting plate is unnecessary. Here, • · ·. * / Blade structure 19 includes tensile stiffeners of tensile steels 34 to be tightened. In this case, welds · · 9 are not necessary. The heat sinks smooth out and enhance1 • · • * "* distribution. They also increase the axial and 4 8

The current casting technique provides a jacket diameter of up to 2500 mm. According to the invention, the diameter is 1000-5000 mm, more preferably 1500-4000 is achieved by using thin sheet material by means of a roller cutter. In addition, both the sheath and the stiffener are laser-cut and laser-welded thin-sheeted pieces providing dimensionally accurate shapes that can be accurately bent. attach 10 to it without deformation. On the other hand your attachment, uses gluing. Other suitable methods may be used in addition to or other than laser methods. The cross-sectional jacket is preferably made of a single sheet metal sheet; which is butt welded. Instead, the axial sheath 15 of the roll is made up of two or more cylindrical bodies. Thus, the manufacturing process remains sufficiently simple. In addition, the holes are icy, especially when using laser cutting. At the same time, the shape and position of the holes can be much more freely shaped than the ones.

The roll according to the invention is considerably β · β: In addition, despite the sheet metal material, the casing has a sufficiently rigid β · β · 'with a stiffening structure. In addition, r <* · · l *. 25 we get rid of semicritical vibration, yeah.

• · ·; ’e / safely produces smaller or v.

mmm ** V larger rolls. At the same time, the plate structures k- ♦ ** "are avoided by the previously set r.

• · • · ** · without weight problems. Well 30 rolls can then be manufactured. In addition, the roll is well resistant to corrosion and new 1

Claims (13)

4 A roll for use in a dry forming machine for passing through a roll {10,11} to which roll (10,11) includes a sheath (16) and both ends thereof (17) for supporting the roll (10,11) in a forming machine, and means (14,15) arranged on the roll (10,11) for pressure or temperature difference inside the roll (10,11) with respect to the environment, characterized in that the sheath (16) is of thin sheet material and m is provided with a stiffening structure (18). Roll according to Claim 1, also known as a stiffening structure (18) of thin sheet material. 15 Roll according to Claim 1 or 2, characterized in that the thickness of the sheet material is 1 to 5 mm, preferably 4 mm. A roller according to any one of claims 1 to 3, wherein the height of the stiffening structure (18) in the direction of the roll (10) is 5 to 30%, more preferably 10 to 20% of the outer diameter of the roll at a height of 100 mm. Roller according to one of Claims 1 to 4, characterized in that the stiffener structure (18) consists of a plurality of ice blocks (19) which are arranged at a distance from one another to another. Roll according to Claim 5, characterized in p Roll according to one of Claims 5 to 7, characterized in that in the stiffening structure (18) the stiffening piece is connected to each other (23) in the longitudinal direction of the roll (10,11). 5 Roll according to Claim 8, characterized by a spacer support (23) consisting of a cylindrical support piece * extending from one end of the roller (10,11) to one of the intermediate supports (23). Roll according to one of Claims 5 to 9, characterized in that the stiffening pieces (19) and / or the support piece have perforations. Roll according to Claims 5 to 10, characterized in that both the sheath (16) and the stiffening pieces (19) are cut and laser welded sheet metal pieces. Roll 20 according to one of Claims 1 to 11, characterized in that the roll is a cylinder (10) or a suction roll (11) of a drying section of a forming machine. Roll according to one of Claims 1 to 12, characterized in that the diaper (16) has a perforation (26) at the point ♦ · · · of the pressure difference inside the roll (10,11). : to wire (12). Roll according to one of Claims 1 to 13, characterized in that the end piece (17) has a honeycomb structure and an insulator (33) of s <* · ** "* 30.