FI117398B - A device for guiding a moving fabric or web in a paper or board machine - Google Patents

Description

117398

A device for guiding a moving tissue or loan in a paper or board machine

The invention relates to a device according to the preamble of claim 1.

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Prior art reference may be made to FI Patent Application 992285, which discloses a papermaker's fabric guiding apparatus comprising a tissue-guiding guide roll, one end of which is movably mounted on a paper machine body to change the axial orientation of the guide roll - on at least two pressurized bellows members filled with pressure medium, which bellows members are arranged to carry the weight of the roll, to keep the height of the roll head substantially constant, and to allow limited lateral movement of the roll head.

Reference may also be made, in the prior art, to FI patent application 20000328, which discloses a device for guiding a moving fabric or web in a paper or board machine, wherein the web or web is passed over a guide roll, mounted on the machine body by means of bearings for changing the axial orientation of the guide roller; and 20 wherein the pivot of the movable end of the guide roller or the corresponding shaft is bearing • Λ *. , ·, On the machine frame with a sliding bearing with said shaft pin supported on a bearing bracket * * ·. by means of hydrostatic plain bearing elements in the bearing bracket • ♦: "* f which are axially displaceable in the direction of the roller axially • · · ·. ' to adjust the sexual orientation.

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In prior art applications where plain bearing technology is used. . The control and tension measurement of the tissue guide roll can be easily accomplished.

* * · * 11 / However, there is one embarrassing feature of these applications: the sliding bearing does not * · * 1 'work without backup systems in the event of a power failure. However, it should be important that the steering roller bearing • 30 does not cause problems during a power failure, but stops the steering while still lubrication of the bearing is not a problem. There is also a problem. the restrictions imposed by the sliding bearing on the steering range, which is currently about ± 3mm.

The object of the invention is to provide a device for guiding a moving tissue or loan S in a paper or board machine, in which problems known in the prior art with regard to power failure situations have been solved.

It is also an object of the invention to provide a device for guiding a moving fabric or web in a paper or board machine that provides a wider range of guide motion than currently known solutions based on plain bearing.

In order to achieve the foregoing and further objects, the device according to the invention is essentially characterized by what is stated in the characterizing part of claim 1.

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The device according to the invention has abandoned the prior art sliding bearing of the rotary movement of the roll and has been treated according to the invention with roller bearings and in the device according to the invention the hydrostatic bearing has been introduced as a linear 20 bearing. Movement of the bearing housing is carried out using devices known per se and currently * in use. In the event of a power failure and oil supply »· ·. * * *. the lubricating film disappears when it breaks, but the plain bearing remains in place as it should. In principle, the solution according to the invention has no control motion area • ♦ *; . ·. but it can be made to the desired length.

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Preferably, in the context of the invention, the oil supply of the hydrostatic bearing is treated. wherein the change in pressure measured directly under the piston can also be used to calculate the fabric tension according to a further preferred feature of the invention. In connection with the invention, the bearing can be implemented either with the piston, the valve 99 9 '· * ·' and the oil supply placed in a roller bearing bracket or body. The pistons 9 9 9 9 9 9 9 999 9 9 9 3 117398 may be one or more. In this case, the oil supply may be a single cartridge valve cover or each piston has its own

The linear bearing used in the invention may also be inclined from the horizontal plane to the vertical plane, but constant force is then required to press the roll against the base for the lubricant tension measurement to work.

In the following, the invention will be described with reference to the figures in the accompanying drawings, the details of which, however, are not intended to be limited in any way.

Figure 1 schematically shows an embodiment of a device according to the invention perpendicular to the end of a roll.

IS Figure 2 schematically illustrates another embodiment of the invention perpendicular to the end of a roll.

Figure 3 schematically illustrates an embodiment of the invention employing a plurality of pistons 20a. . ·. Fig. 4 schematically illustrates another embodiment employing a plurality of pistons.

Fig. 5 is a diagrammatic longitudinal view.

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Figure 6 shows an embodiment of an inclined device.

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Fig. 7 schematically shows another embodiment of an inclined device.

Fig. 8 is a sectional view A-A in Fig. 7.

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1-8, the corresponding reference numerals are used where applicable unless otherwise indicated.

In the figures of the drawing, the guide roll is denoted by reference numeral 1 and the fabric or web passing through the roll is denoted by reference numeral 3. In the case of fabric 3, it may be, for example, a wire, a felt, a drying wire or the like. In the case of Hainan, it may be a paper or cardboard scrap. The guide roll 1 is mounted transversely to the running direction R of the fabric 3. The guide roller 1 is provided at its ends with shaft pins 2 or similarly with a shaft from which the guide roller 1 is rotatably mounted on bearings 10 by means of rollers 9 mounted in the housings 5. According to the invention, the bearing housing 5 of the other end in the direction of the control movement A of the guide roller 1 is supported by hydrostatic bearing 7 on the machine frame 4. The bearing 7 of the first end of the guide roller 1, shown in Figures 1-4 and 6-8 the bearing housing 6 is fixedly connected to the body 4.

The bearing 9 allows the axial direction of the roller 1 to rotate with respect to that bearing point within the bearing housing 6. In this case, for example, a spherical roller bearing can be used as the bearing 9.

The movable end of the roll 1 shown in the figures is supported by a bearing housing 5 which rests on a hyd-20 hydrostatic slide bearing 7. Roller bearing bearing *. 7 carries the weight of the roll 1 together with the supporting members of the opposite end of the roll.

The position of the tissue 3 on the roller 1 is tracked in a manner known per se by a tracker • «1» · «1: which instructs the actuator 8 to move the end of the roller to either one. , ···, 25 paan the direction of arrow A. The movement directions. As actuator 8, any electromechanical, pneumatic or hydraulic actuator known from corresponding applications can be used. Since the direction of travel of the fabric 3 remains perpendicular to the axis of roll e · 1 \ ··· \ 1, the change in axial direction of the roll causes the fabric 3 to deflect by the direction 1 and the position of the fabric in the transverse direction of the paper machine. · 30 yrs repaired. Thanks to the linear bearing 7, the bearing housing 5 is almost frictionlessly transmitted in the direction of the transmission force provided by the desired magic actuator * * * * «1 • 1 · • ♦ 1» 5 117398. Advantageously, the guide means are dimensioned such that the offset of the roll end in the direction of travel of the fabric 3 is at most ± 60mm.

As shown in the figures, the rotary movement of the roller bearing is maintained by the roller 5 bearings 9 and the hydrostatic bearing 7 is provided with a linear bearing in the direction of the roller control movement A. Movement of the bearing housing 5 is effected by means of actuators 8 known per se and currently in use.

The hydrostatic bearing 7 is formed by an oil or other medium film between the bearing housing 5 10 and the body 4. The pressure medium of the hydrostatic bearing 7, for example oil, is fed along the feed line 13 under pressure under the piston 12 and then through the capillary lines 17 through the piston 12. The pressure adjustment is effected by means of a slide valve 11 or the like known in the sliding-wheel technique, whereby the pressure change of the fabric 3 can also be calculated from the pressure change measured directly under the piston 12. The bearing 7 may be implemented such that the piston 12, the (pat-screw) valve 11 and the oil supply 13 are disposed on either the bearing bracket 5 or the body 4. There may be one or more pistons. Figures 3 and 4 illustrate an embodiment of the invention using a plurality of pistons, wherein the oil supply is effected via a single cartridge valve or each piston has its own. In the 20 applications shown in Fig. 3, the pressure on the left is controlled by one cartridge valve and under its piston. passing oil through a separate passage 18 to an adjacent piston. Figure 4 shows the half-· · · · · · · · ·. An application illustrated in which the manifold manifold 12 has its own valve 11.

ft ft:. ·. For tension measurement, such an application requires pressure measurement «* *; ., Under each of the pistons 12, which gives total force by lowering.

ft ft

The linear bearing 7 may also be inclined from the horizontal to the vertical,. ((but then constant force is required to press the roll against the base for lubrication and • * * * l !. * tension measurement to work, Figures 6-7.

! 1 * · «« # / *: 30 It is most advantageous to install the sliding shoe of linear bearing 7 in the direction where ** # the center of the 3 coverage angle of the fabric indicates the tension measurement of the pressure- # I I ft ft ft ··· ft ft 6 117398 difference. If the directions deviate significantly, the measurement accuracy can be increased by inserting an incline 14 at an angle of 90 ° to the previous one and calculating the tissue tension from these pressure differences, Figures 6-7.

Figs. 6 and 7 show applications in which the position of the guide roll in the tissue rotation is such that the guide direction A is not horizontal. The linear bearing 7 is then inclined. Figure 6 shows a version in which the pistons 12, 14 are at an angle of 90 ° and the pressure of each is determined by the load. The auxiliary plug 14 with its valves 11 may be disposed either in the bearing bracket 5 or between the actuator 8 and the top bracket 5, whereby its load may be against the bearing bracket 5 or against the bearing surface 16 on the actuator 8. In Figure 7, further auxiliary pistons 15 are disposed in a direction opposite to the bearing 7 to press the bearing bracket 5 against the body 4. 6 and 7, the actuator 8 for moving the bearing bracket 5 is located below the bearing bracket 5.

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Fig. 8 is a schematic sectional view A-A of Fig. 7 showing a support force application to the bearing bracket 5 implemented by the second additional nozzle 15.

The invention has been described above only for some advantageous application examples. 20, the details of which are not intended to be construed in any way as restrictive. . ·. this.

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Claims (10)

Apparatus for guiding a moving tissue or web in a paper or cardboard machine in which the web (3) or web is passed over a guide roll (1), which guide roll (1) is rotatably mounted in a body construction (4) of the machine by means of bearings (9) located in bearing housing (5) and one end of the guide roller (1) is displaceable for changing the axial direction of the guide roller (1), characterized in that the bearing housing ( 5) for the sliding end of the guide roller (1) is stored in the machine body (4) with a linear bearing (7) by means of hydrostatic sliding bearing elements (12). 2. Device according to claim 1, characterized in that the sliding bearing (7) comprises one or more pistons (12) and feed (13) of pressure medium. 15 Device according to claim 1 or 2, characterized in that the piston (s) (12) are placed in a bearing box (5). ·· · ♦ ♦ * • · a •. 4. Apparatus according to claim 1 or 2, characterized in that: The valve / pistons (12) are located in the machine body (4). • · a * a · * • * V Device according to any of the preceding claims, characterized in that the control of the pressure of the pressure medium in the hydrostatic sliding bearing (7) is handled by a cartridge valve (11) or the like. 25 • * a ··· Device according to any of the preceding claims, characterized in that the storage is provided with equipment for measuring the tension of the tissue. • 4 • · 4 4 4 • 4 4 · 4 * 4 Device according to claim 6, characterized in that the equipment for measuring the tension of the tissue comprises pressure measurement of the rescue pressure 4 · below the piston (s) (12). ίο 117398 Device according to any of claims 1-7, characterized in that the linear bearing (7) of the bearing housing (5) is placed in a horizontal plane. Device according to any of claims 1-7, characterized in that the linear bearing (7) is located on a sloping pane or in a vertical plane. Apparatus according to any of the preceding claims, characterized in that the bearing of the guide roller (1) is provided with an action device (15) for pressing the bearing housing (5) against the body (4) when the sliding bearing is inclined to the horizontal plane. 15 • aa • «aaaa • • iaa •« a aa a • 1 1 • aaa • a · • a • aaaaaaaaaaaaaa • aa • aa aa ·· • · aa aa · • aaaaaaaaaaaaaaaaaaaaa aa aaaa • aaa aa aaaaaaaaaaa