EP1760192A1 - Roll for paper machine - Google Patents

Abstract

The roller (1) has a rotatable, perforated roll shell (2), and a pressure or a suction box (3) that is connected with a low pressure source and/or a high pressure source. A bending support (10) is arranged relative to the pressure or suction box in the roller in such a manner that a bending of the pressure or suction box is balanced by the bending support. A bias voltage is hydraulically, pneumatically, electrically applied by a spindle-type lifting gear or by an adjusting screw.

Description

The invention relates to a suction or blower roll of a machine for producing and / or finishing a paper, cardboard, tissue or another fibrous web with a rotatable, perforated roll shell and a pressure or suction box, with a lower or a Overpressure source is connected.

Under- or overpressure zones in the form of a pressure box, which is connected to a lower or overpressure source and adjacent to a moving surface such as the roll shell, are used at various points of a machine for producing a fibrous web, in particular a paper machine, for example in the Shaper, in the press section and / or in the dryer section. The suction boxes can be used, for example, within suction rolls. These usually have fixed, inner suction boxes which form zones of different pressure levels, wherein the sealing of the negative pressure zones is effected by sealing elements, which usually extend at least substantially over the entire length of the roll.

Suction and blow rolls must be made larger because of the deflection of the suction or pressure boxes than would be required because of their own Banteldurchbiegung. This increases the cost of producing the rolls, it also creates an additional design effort in the production of the rolls. In particular, the Saugkastendurchbiegung requires a special sealing strip design.

It is the object of the invention to provide a blowing or suction roll, which is structurally simpler and has a high stability.

In a suction or blower roll of the type mentioned, this object is achieved in that at least one bending beam is provided, which is formed and is arranged relative to the pressure or suction box in the suction or blower roll, which is compensated by the bending beam, the deflection of the pressure or suction box.

According to the invention, at least one bending beam is installed on the suction box or on the pressure box such that the bending beam eliminates the deflection of the suction box or of the pressure box via a pretension. It is understood that in the context of the invention, a plurality of, each provided with its own adjusting means bending beams are used, if the size and the deflections of the suction or the pressure box require it. Thus, for example, the bending line of the pressure or suction box of the deflection of the roll shell can be adjusted via a controller. This measure is particularly important in press rolls with different pressing pressures of importance.

Advantageous developments emerge from the subclaims, the description and the drawings.

According to the invention it is possible to arrange the bending beam outside of the suction or pressure box or alternatively within the suction or pressure box.

An advantage of an embodiment of the invention, according to which the at least one bending beam is under a bias that at least substantially compensates for the deflections caused by the suction or pressure box.

The bias voltage can be generated in various ways; In particular, it can be applied hydraulically, pneumatically, electrically or by means of at least one screw jack or by means of at least one screw on the bending beam or bending beam. As a rule, several screws are distributed over the length of the bending beam, which can be adjusted during the initial assembly or on the occasion of later revision work on the roller so that the Deflection of the pressure or the suction box is compensated.

Preferably, the suction or blowing roll is characterized in that between the at least one bending beam and the pressure or suction box at least one spacer element for adjusting a fixed distance between the bending beam and the pressure or suction box is arranged. The spacer or intermediate piece determines the distance between the bending beam and the pressure or suction box.

It is advantageous if a plurality of clamping elements between the pressure or suction box and the at least one bending beam is arranged. Optionally, the clamping elements can be arranged at a certain distance on a rail; or their position on the rail is variable, so that can be fixed already during assembly advantageous positions of the clamping elements. Optionally, however, the tension under which the clamping elements are located can also be set according to the respective overpressure or underpressure.

In particular, it can be advantageously provided that the pressure or suction box is mounted above at least one vibration damper relative to the at least one bending beam.

Another advantageous embodiment of the invention is that the vibration damper with the hydraulic or pneumatic cylinders or with electromechanical actuators are integrated. When controlling the pneumatic or hydraulic cylinders, their setting data can be used to control the pressure or suction box.

Preferably, the suction or blowing roll is characterized in that between the pressure or suction box and the least one bending support an oil pressure cushion or a compressed air cushion is arranged, so that as a result, the pressure or suction box on the between the bending beam and this arranged oil or Air cushion floats.

In addition, it is advantageous to use vibration dampers based on the multi-disc compressed air cushion principle in conjunction with the oil pressure cushion. Such vibration dampers are also referred to as hydro-pneumatic vibration damper.

Alternatively or additionally, it is conceivable to use hydro-mechanical vibration dampers, such as, for example, an oil-spring damper system.

In addition, in one embodiment of the invention advantageously a measuring device is used, in particular a laser as a light source in conjunction with a light detector, for measuring the deflection of the pressure or suction box, in the suction or blower roll; In this case, the measuring device is either permanently installed inside the suction or blower roll in order to constantly perform a deflection compensation can, or the measuring device is used once during assembly or additionally later in a revision of the roller without being firmly installed in the roller. However, the installation of the measuring device within the roller is particularly advantageous because the deflection of the pressure or the suction box changes a little depending on the set positive or negative pressure and therefore should be compensated accordingly again.

Likewise, advantageously, a control or regulating unit can be used which controls or regulates an adjustment of the preload of the at least one adjusting screw or the at least one adjusting element as a function of the deflection measured by the measuring device.

Overall, the advantages of the invention are that suction or blow rolls can be built smaller and cheaper. The vibration behavior of the roller is improved. Preferably, the bending line of the suction or pressure box can be controlled, which also results in an improved Dichtleistenanpressung. The vibration behavior can be reduced by means of vibration dampers. Over a Vacuum control can be an optimal sealing strip contour set with changing underpressure or overpressure.

Optionally, the principle according to the invention of providing a bending support within a roll for pre-bending the yoke and thus for rotating the bearings of a spreader roll can be used, in particular in spreader rolls whose roll jacket is stretched over the bearings. Furthermore, the principle could also be used for yokes of S-rolls.

Fig. 1:

einen Längsschnitt einer mit einem Biegeträger ausgestatteten Saugwalze,

Fig. 2:

einen Querschnitt der Saugwalze aus Fig. 1 entlang einer Schnittlinie A - A,

Fig.3

einen Querschnitt einer Saugwalze, in der zusätzlich ein Schwingungsdämpfer angeordnet ist,

Fig. 4

eine Ausgestaltung eines Schwingungsdämpfers,

Fig. 5

einen Ausschnitt aus dem Längsschnitt einer weiteren Saugwalze mit einem Biegeträger,

Fig. 6

einen Querschnitt der Saugwalze gemäß Fig. 5 entlang einer Schnittlinie B - B,

Fig. 7

eine alternative Ausführungsform der Saugwalze gemäß Fig. 5,

Fig.8

eine Saugwalze mit einer Messeinrichtung mit einem Laser im Längsschnitt,

Fig. 9

einen Querschnitt durch den Saugkasten aus der Saugwalze gemäß Fig. 8 entlang einer Schnittlinie C - C,

Fig. 10

einen Querschnitt durch einen Saugkasten in Verbindung mit einem Schwingungsdämpfer und

Fig. 11

einen weiteren Querschnitt eines Saugkastens, der mittels drei Biegeträgern in der Saugwalze gelagert ist.

The invention will be explained in more detail with reference to the drawings in exemplary embodiments. Show it:

Fig. 1:

a longitudinal section of a suction roller equipped with a bending carrier,

Fig. 2:

1 is a cross section of the suction roll of FIG. 1 along a section line A - A,

Figure 3

a cross section of a suction roll, in which a vibration damper is additionally arranged,

Fig. 4

an embodiment of a vibration damper,

Fig. 5

a detail from the longitudinal section of another suction roll with a bending beam,

Fig. 6

a cross section of the suction roller according to FIG. 5 along a section line B - B,

Fig. 7

an alternative embodiment of the suction roll according to FIG. 5,

Figure 8

a suction roll with a measuring device with a laser in longitudinal section,

Fig. 9

a cross section through the suction box from the suction roll of FIG. 8 along a section line C - C,

Fig. 10

a cross section through a suction box in conjunction with a vibration damper and

Fig. 11

a further cross section of a suction box, which is mounted by means of three bending beams in the suction roll.

A roller shown in Fig. 1 is a suction roll with an open volumes, in particular perforations, having, rotatable roll shell 2 is provided; Such a suction roll 1 is used in paper machines, in particular in the former during sheet formation, in the press section and in the dryer section.

The suction roll is wrapped by an air-permeable belt, so for example a sieve or a felt or made of another material band, and a lying thereon, to be dewatered fibrous web, with one of a roll shell 1 towards open, fixed suction box 3 (Fig. 1, 2) formed in the roll interior adjacent to the wrap area. The interior of the suction box 3 is connected to a vacuum source. The suction box 3 adjoins the inside of the roll mantle 2 via a sealing strip 5 held by a sealing strip holder 4. The rotating roll shell 2 is mounted on bearings 6 with respect to a fixed shaft 7, which in turn is received by side frames 8. 9.

Below the suction box 3, a bending beam 10 is arranged, which is separated by at least one spacer 11 of the suction box 3. Optionally, additional spacers can additionally be provided at positions 11 '.

By means of hydraulic or pneumatic cylinders 12, 13, which are integrated, for example, in the bottom area of the suction box 3, forces F are applied to the bending beam 10 in order to compensate at least partially for the deflection of the suction box 3 in its center.

In an alternative (FIG. 3) it is provided that between the bending beam 10 and the suction box 3 a filled with oil and serving for bending compensation Vibration damper 14 is arranged to absorb vibrations.

A vibration damper may be constructed, for example, like the vibration damper 15 shown in FIG. 4, the vibration damper 15 having an air filling 17 above an oil layer 16. Furthermore, fins 18 are present. In the case of oscillatory motion, for example, of the roll mantle, the fins 18 are flowed through by the oil 16. The fins 18 cause this friction whereby the vibration movement is damped.

In another suction roll 19 (FIG. 5), a bending support 21 is arranged within a suction box 20. Under the bending beam, a measuring device with a laser 22 and a detector 23 detecting the laser light is provided in order to detect the bending of the bending beam 21.

In the suction roll 19, an oil pressure cushion 24 (Fig. 6) is provided below the suction box 20 and above the bending beam 21; the oil pressure cushion 24 is sealed by means of membranes 25, 26 with respect to the suction box 20, which allow a certain mobility of the oil pressure cushion 24. In addition, vibration dampers 27, 28 are provided.

As an alternative to the structure shown in FIGS. 5, 6, according to FIG. 7, a plurality of hydraulic or pneumatic cylinders 29 or only a single hydraulic cylinder or at least one electric screw jack or, alternatively, adjusting screws are provided to adjust the distance between the suction box 20 and the bending beam 21. In addition, a hydropneumatic damping device can also be used here.

In another embodiment of the invention (FIGS. 8, 9), a measuring device 30 with a laser 31 producing laser radiation and a detector 32 for this purpose are arranged inside a tube 33. Incidentally, the structure is the same as in FIGS. 5 to 7. In addition, between the suction box 20 and the bending beam 21 a Vibration damper 34 (Fig. 9, 10) may be provided. In a further exemplary embodiment (FIG. 11), a plurality of bending beams 35 to 37 are arranged outside (below and laterally) of the suction box 20. By arranging several bending supports per suction box, the bending line of the suction box of the deflection of the roll shell, for example. Via a controller, be adapted, which is advantageous in press rolls with different pressing pressures over the web width, so that the sealing strips of the suction box 20 optimally on the roll shell for conditioning come to ensure a good sealing effect. At each of the bending beams 35 to 37, as shown above, spacer elements, vibration dampers and devices for applying a force to compensate for the deflections are attachable.

It is understood that the embodiments described above with reference to suction rolls are also applicable to blow rolls. Instead of a single suction or pressure box, a plurality of juxtaposed or successively arranged segments of a suction or a pressure box may be provided.

The bending beam can, for example, be made of metal, such as, for example, steel, or of plastic, in particular fiber-reinforced plastic.

Claims (13)

Suction or blower roll (1, 19) of a machine for producing and / or finishing a paper, board, tissue or another fibrous web with a rotatable, perforated roll shell and a pressure or suction box (3, 20), with connected to a lower or a positive pressure source,
characterized,
in that at least one bending support (10, 21, 35, 36, 37) is provided, which is designed and arranged relative to the pressure or suction box (3, 20) in the suction or blower roll (1, 19), which passes through the Bending support (10, 21, 35, 36, 37), the deflection of the pressure or suction box (3, 20) is compensated. Suction or blower roll (1, 19) according to claim 1,
characterized,
in that the bending support (10, 21, 35, 36, 37) is arranged outside the suction or pressure box (3, 20). Suction or blower roll (1, 19) according to claim 1,
characterized,
in that the bending support (10, 21, 35, 36, 37) is arranged inside the suction or pressure box (3, 20). Suction or blower roll (1, 19) according to one of claims 1 to 3,
characterized,
in that the at least one bending support (10, 21, 35, 36, 37) is under a bias which at least substantially compensates for the deflections caused by the suction or pressure box (3, 20). Suction or blower roll (1, 19) according to claim 4,
characterized,
that the bias hydraulically, pneumatically, electrically by means of at least one screw jack or by a set screw at least be applied. Suction or blower roll (1, 19) according to one of claims 1 to 5,
characterized,
in that between the at least one bending beam (10, 21, 35, 36, 37) and the pressure or suction box (3, 20) at least one spacer element for setting a fixed distance between the bending beam (10, 21, 35, 36, 37) and the pressure or suction box is arranged. Suction or blower roll (1, 19) according to one of claims 1 to 6,
characterized,
that a plurality of clamping elements between the pressure or suction box (3, 20) and the at least one bending beam (10, 21, 35, 36, 37) is arranged. Suction or blower roll (1, 19) according to one of claims 1 to 7,
characterized,
that the pressure or suction box (3, 20) is mounted above at least one vibration damper (14, 15, 34) relative to the at least one bending beam (10, 21, 35, 36, 37). Suction or blower roll (1, 19) according to claim 8,
characterized,
in that the at least one vibration damper (14, 15, 34) is integrated with the hydraulic or pneumatic cylinders or with electromechanical actuators (14, 34). Suction or blower roll (1, 19) according to one of claims 1 to 9,
characterized,
that between the pressure or suction box (3, 20) and the least one bending beam an oil pressure cushion or a compressed air cushion is arranged. Suction or blower roll (1, 19) according to claim 10,
characterized,
that vibration dampers (14, 15, 34) are used according to the lamella compressed air principle in conjunction with the oil pressure cushion. Suction or blower roll (1, 19) according to one of claims 1 to 11,
characterized,
in that a measuring device (30), in particular a laser (31) as a light source in conjunction with a light detector (32), for measuring the deflection of the pressure or suction box (3, 20) in the suction or blower roll (1, 19) is used or can be used. Suction or blower roll (1, 19) according to claim 12,
characterized,
that a control or regulating unit is provided, the function of the measured by the measuring device (30) controls a deflection adjustment of the bias of the at least one screw or at least one actuating element or regulates.

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