FI114037B - Paper or board machine suction roll and method for paper or board machine suction roll - Google Patents

Description

114037

Paper or board machine suction roll and method in connection with paper or board machine suction roll

Sugvals i en pappers-eller cardboard mask och ett förfarande i samband med en 5 sugvals i en pappers-eller cardboard mask

The invention relates to a suction roll for a paper or board machine according to the preamble of claim 1.

The invention also relates to a method according to claim 9 in connection with a suction roll of a paper or board machine.

15 In a paper and board machine, suction rolls are used with a wire section or web forming section as well as a press section and a drying section. In paper and board machines, suction rolls are used, among other things, to remove water and control the flow of the web.

. As is known in the art, suction rolls for use in a paper or board machine generally comprise a torn roll cover attached to the end flanges at the ends of the roll. The end flanges, on the other hand, are pivotally mounted on the bearing brackets mounted on the machine: frame. As is known in the art, a vacuum suction box providing suction roll vacuum can be located either inside the roll shell:. mounted on the roller bearing brackets, or the inside of the roller may also be empty, whereby a vacuum effect is achieved by using an outside suction box.

25; A: As a result of current technological developments, the width of paper and board machines is increasing, which means that the diameter of the rolls must be increased in order to be inside the roll '. to be sufficiently rigid due to the deflection caused by the suction.

Suction boxes become heavy and rolls expensive to manufacture. As the diameters of the rolls 30 used increase, the inner suction box used with the suction rolls has to be made more rigid, whereby the deflection of the suction roller and the suction box causes e.g. sealing problems. A problem with prior art solutions has been that when the suction box is bent during use under vacuum, its side seals are more worn in the middle. One problem with prior art solutions has also been that when the suction box deflects 5 the seals are worn out, the suction box may hit the inner surface of the diaper, which may then be damaged. Further, when the suction roller is disengaged, it may not be possible to achieve sealing during the re-commissioning for the above reasons.

One problem with prior art solutions is also the lockable seals as the inside suction box of the suction roller moves, the seal is released from the diaper 10, whereby the lockable seals are unlocked.

The object of the invention is to provide a suction roll and a method in connection with a suction roll, in which the disadvantages of the prior art solutions described above have been eliminated or at least minimized.

15

In order to achieve the above and later objects, the suction box according to the invention is essentially characterized by what is stated in the characterizing part of claim 1.

In turn, the method according to the invention is essentially characterized by * · ..: what is stated in the characterizing part of claim 9.

1 I

; According to the invention, side channels are provided inside the suction roll in connection with the suction chamber area, through which the vacuum pressure 25 of the suction roll can be influenced and the vacuum created by the suction box can be saved. In the method of the invention, through the diameter of the roll, the vacuum applied to the actual suction area in the holes of the roll sheath is transferred from the downstream side to the inlet side through the side channels / side channel. ready for suction holes.

3, 114037

In the practice of the invention, the suction box outside the roll can be made sufficiently rigid, regardless of the width of the machine, regardless of the diameter of the roll.

The side channel principle of the invention is also applicable to the inside suction box of the suction roll, whereby a side channel which is sealed to the inner surface of the diaper is formed in connection with the actual suction chamber.

When an external suction box is used in the suction roll of the invention, the suction box 10 is located outside the roll sheath and its effect is transmitted through the roll to the areas where a vacuum effect is desired. Preferably, the suction box extends only to a portion of the periphery of the roll shell substantially on the opposite side of the suction region. The vacuum effect of the suction box is conveyed through a suction chamber area limited by partitions 15 extending longitudinally into the roll shell. These partitions also have limited side channels on either side of the suction chamber area, and one side of each side channel is respectively limited by a wall extending in the other longitudinal direction of the roll. If necessary, transverse support ribs located between the partitions * are used to support the structures, with an optimum location of> · 20 for the structure and roll operation. Each partition; is supported on the inner surface of the jacket by a non-abrasive sealing means, such as those marketed by the Applicant, such as those marketed by LocSeal or a spring loaded * · t, sealing member, which preferably provides a gap seal. If necessary, through the inner surface of the roll casing and the seal, • '' may be used to enhance sealing; 25 tap water or traditional abrasive gaskets. The effect area of the external suction box is also limited by the longitudinal direction of the roll towards the outer circumference of the roll shell; · 'Through walls which are sealed members, preferably spring-loaded. * ", supported by sealing elements on the outer surface of the jacket.

According to a further advantageous feature of the invention, non-abrasive seals, such as those marketed by the applicant under the trade name LocSeal, are used as seals. The seals may be, for example, slot seals or long seals located near the jacket. If necessary, sealed water, preferably conducted through the seal, may be used in connection with the seals between the seal and the surface of the jacket.

5 Since the bending of the suction suction box does not cause any problems, the sealing is easy to implement and the wear of the seals does not cause problems, since the seals do not hit the diaper and thus the inner surface of the diaper cannot be damaged. Also, the use of the suction suction box as an outer box does not cause problems when bending, since the sealing is easy to perform and the wear of the seals 10 does not cause problems because the seals do not hit the diaper and consequently the outer surface of the diaper is not damaged. Furthermore, the arrangement according to the invention allows for lighter dimensioning of the structures, bearing, etc., since the dimensioning of the suction does not have to be taken into account, e.g. Such a suction box is not loaded, so its design only needs to consider the risk of tripping. In this way, the material for the suction box can be selected from several different options, for example made of plastic.

The suction roll according to the invention is used in paper or board machines as a suction roll in various positions and functions, e.g.

> «20

In the suction roll of the invention, air is also supplied from the side channels / channels. cleans the holes in the suction roll roller, reducing the need for washing. The side channel / channel transmits the suction effect so that, for example, the high vacuum required on the inlet side of the pick-up roll can be led to the second chamber, and so '; 25 in connection with the present invention can be used in a large inlet side of the low pressure requirement. Or in suitable suction roll applications where prior art has required two; , a pig chamber roll, in which the first chamber catches the web and the second holds,. * '. For the purposes of the present invention does not need two chambers, but the downstream side channel can serve as the holding channel.

30 5 114037

In the arrangement according to the invention, when the torn sheath of the suction roll rotates within the suction area, vacuum is charged into the suction holes of the suction roll sheath. The hole passes the outlet side of the seal tends to be filled in the hole in the vacuum roll from the inside and from the outside. On the outside of the suction side, the loss of vacuum in the suction hole empties the suction hole 5 from any water, pulp or the like. The outside of the suction box on the outside does not allow external filling. Internal vacuum filling causes vacuum in the side ducts because the outside is sealed. Correspondingly, as the suction roll diaper rotates, the suction suction hole of the diaper re-enters at the other end of the side channel / duct and recharges at low vacuum before the 10 actual suction chambers. This arrangement saves vacuum.

The suction rolls are significant sources of sound for the paper machine and the side suction passages of the suction roll according to the invention also act as silencers, since the filling and emptying of the suction suction hole of the jacket is slower than if there were no side chamber 15.

In the following, the invention will be described in more detail with reference to the figures in the accompanying drawings, in which details, however, are not intended to be narrowly limited.

20: Figure 1 schematically illustrates an embodiment of the invention using an external suction box.

Figure 2 schematically illustrates an embodiment of the invention using an inner suction box.

Fig. 1 shows the direction of rotation of the suction roll 10 by the arrow S. The actual suction; ' "; area HA is delimited by roll diaper 11 by partitions 13, 14 extending longitudinally 'of roll 10 of suction chamber area 12. The actual suction area HA is thus also limited by ,,,,; 30 side channels 15 and 16, on the other hand, delimited by second partitions 17, 18 running along the longitudinal direction of the roll 10. A sealing member 26, 27, 21, 22, 23, 24, 25, preferably a slit seal or other similar non-abrasive seal, which seals the roller sheath 11 of the structure, is provided at the end of each of the partitions 13, 14, 17, 18. relative to the inner surface. If necessary, water is used in connection with the seals 21 to enhance the seal between the seal 21, 22, 23, 24, 25, 26, 27 and the jacket 11 5. The sealing can also be accomplished in other ways obvious to one skilled in the art. The suction box 30 outside the suction roll 10 is located on the opposite side of the roll diameter relative to the suction area, extending over part of the periphery of the diaper, thereby providing a vacuum in the suction chamber to provide suction effect on the suction area 11A. The vacuum effect causes the air currents to shift as indicated by arrows S1 and S2, whereby the vacuum effect of the actual suction area 11A can be utilized in the side passages 15, 16. If necessary, a gasket 28 is provided through the suction box 30 area. As shown in the figure, the support ribs of the partitions 13, 14, 17, 18 may also be disposed on the al-15 or other suitable structure and function, unlike the version shown in the figure. The effect of the external suction box 30 is transmitted by the partitions 31, 32 along a restricted passage to the suction chamber area 12 of the suction roll 10. The partitions are sealed with seals 33, 34, 36 on the outer surface of the roll shell.

Fig. 2 schematically illustrates an embodiment of the invention using an inner suction box 40 inside a suction roll 10. Outside the inner suction box 40 of the suction roll 10 inside the diaper 11, the inside of the socket 11 * · • · ',,; A side chamber 45 is provided formed by a second wall 47 disposed outside the wall 46 of the actual suction chamber 40 '1'. The side chamber 45 is sealed by sealing members 42 and 43 on the inner surface of the sheath 11 of the suction roll 10.

»

The embodiments shown in Figures 1 and 2 above have suction chamber areas, a suction chamber; And the side channels and side chambers are naturally also sealed to the ends of the suction roll 10; * (not shown in the figures).

30 7 114037

According to the invention, the negative pressure that comes with the holes in the diaper 11 is transferred from the discharge side to the inlet side in the flows S1, S2 to the suction holes. As the torn sheath 11 of the suction roll 10 rotates in the suction area 11A, vacuum is charged into the suction holes of the sheath 11 of the suction roll 10. The hole passes the outlet side of the seal 22; 42 tends to fill them in the hole 5 inside and outside the roll 10. On the outside of the suction side, the loss of vacuum in the suction hole will drain any suction water, pulp or the like. On the outboard side of the external suction box 30, external filling cannot occur. Internal vacuum filling causes vacuum in the side channels 15, 16; 45 because the outside is sealed. Correspondingly, as the diaper 11 of the suction roll 10 rotates, the suction hole of the diaper 11 comes to the other end of the side duct and recharges at low vacuum before the actual suction chamber 12; 40. This arrangement saves vacuum.

The invention has been described above with reference only to a preferred embodiment 15 thereof, the details of which, however, are not to be narrowly limited.

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Claims (15)

A suction roll for a paper or board machine, in which a suction box (30, 40) is arranged for use in the suction area (11 A) of the roll shell (11), characterized in that at least the inside of the roll shell (11) of the suction roll (10) a single side passage (15,16; 45) through which the negative pressure exerted on the holes in the roll casing (11A) in the actual suction area (11A) can be transferred from the waste side to the inlet side through the side passage (s) (15); 1 IA). 10 Suction roll according to claim 1, characterized in that the suction box (30) is located outside the roll shell (11) of the suction roll (10) and that the suction effect of the suction box (30) is transmitted through the suction chamber (12) extending through the suction roll (10). ), the suction chamber (12) being delimited by partitions (13, 14) extending in the longitudinal direction of the roll (10) inside the roll shell (11), and the lateral channels (15, 16) are arranged in connection with the suction chamber (12). side by second partitions (17, 18) extending longitudinally of the roll (10). ·: 20 Suction roll according to Claim 1, characterized in that the suction box (40) 'is located inside the roll shell (11) of the suction roll (10) and that the side channel (45) is' *: formed by a partition formed by the outer wall of the actual suction chamber (40). (46) with a second partition wall (47) surrounded by a suction chamber (40) inside the roll casing (11). 25 ; Suction roll according to one of Claims 1 to 3, characterized in that the intermediate walls (13, 14, 17, 18; 45, 46) are provided with seals (21, 22, 23, 24, 25). 26, 27 ;: 42, 43) for sealing and separating the suction chamber (12; 40) and the side channels (15, 16; 45) from the rest of the inside of the roll shell (11). 30 114037 Suction roll according to Claim 4, characterized in that the seals (21, 22, 23, 24, 25, 25, 27; 42, 43) are non-abrasive seals. Suction roll according to claim 4 or 5, characterized in that water can be introduced between the seals 5 (21, 22, 23, 24, 25, 25, 27; 42, 43) and the inner surface of the roll shell (11) to enhance sealing and sealing of the roll shell. (11) between the inner surface. Suction roll according to claim 2, characterized in that the vacuum effect of the suction box (30) 10 is led to an inner suction chamber (12) of the suction roll (10) delimited by walls (31, 32) extending to the outer circumference of the roll sheath (11). an area of action of the suction box (30) for the peripheral portion of the roll flange (11). Suction roll according to Claim 7, characterized in that the walls (31, 32) 15 are sealed to the outer surface of the roll shell (11) of the suction roll (10) by sealing elements (33, 34, 36). 8 114037 A method in connection with a suction roll of a paper or board machine, wherein a vacuum effect is achieved through the suction box (30, 40) on the suction area (11A) of the roll mantle (11), characterized in that via at least one side channel (15, 16; 45), which is tracked, the vacuum applied to the holes in the roll socket (11) for the actual suction area (1 IA) can be: · transferred from the downstream side to the inlet side through the side channel (s); ). 25 A method according to claim 9, characterized in that, when the perforated diaper of the suction roller * in the suction area (HA) rotates in the suction roller (11) of the suction roller (10); : Loading negative pressure into the holes, the hole passes the trailing seal (22, 42) in the hole • * A vacuum is met roll (10) inside and outside of the delivery side outside the vacuum suction hole 30 Lella clear the possible loss of the water suction hole.,: '' J pulp or the like, that the internal vacuum filling causes an underpressure to the lateral channel (s) (45; 15, 16) when the exterior is sealed by sealing members (22, 23, 24, 25, 26, 27; 42, 43) and that on the wheels of the suction roll (10), the suction hole of the diaper (11) re-enters at one end of the side channel (s) and is recharged under reduced pressure before the actual suction zone area (1A). A method according to claim 9 or 10, characterized in that the method of perforating the suction roll roll mantle (11) in the suction effect region (1A) provides a vacuum effect via a suction box (30) located outside the roll mantle (11). 11) through the diameter of the suction roll (10) into the suction area (11A) via the suction chamber (12) and through the side channels (15, 16) arranged on either side of the suction chamber (12) to effect the vacuum of the suction area (1A). Method according to Claim 9 or 10, characterized in that a suction effect is provided on the inside suction box (40) of the suction roll (10) of the roll sheath (11) and in a lateral passage (45) arranged around the actual suction chamber (40). ) is applied to the vacuum of the suction area (1 IA) of the suction roll (10). A method according to any one of claims 9 to 12, characterized in that the vacuum which comes with the holes in the roller cover (11) of the suction roller is transferable from the inlet side to the inlet side via the side channels / channel (15, 16; 45). ': to the holes. A method according to any one of claims 9 to 13, characterized in that the vacuum effect transmitted via the side channels / channels (15, 16; 45): * can be influenced by the need for vacuum in the suction box (30; 40). » Method according to one of Claims 9 to 14, characterized in that the air drawn from the side channels (15, 16; 45) cleans the suction roll (10); holes in the roll cover (11). Π 114037