FI123493B - Curved roll attachment means, arrangement and method for controlling curved roll vibration - Google Patents

Description

CONVEYOR ROLLER MOUNTING BODY AND ARRANGEMENT AND METHOD FOR CONTROLLING THE VIBRATION OF A CURVE ROLL

OBJECT OF THE INVENTION 5

The present invention relates to a curved roll fastening member located in a paper machine or a postprocessing machine. The invention also relates to the use of such a fastening member as a fastening member for a curved roll. The invention further relates to an arrangement and method for controlling the oscillation of a curved roll in a paper machine or paper finishing machine.

BACKGROUND OF THE INVENTION Rolls in a paper machine generally exhibit harmful resonance vibration at certain roll speeds at critical travel speeds. Critical velocity means that the rotational frequency of the roll is the same as the first characteristic frequency of its transverse oscillation. Thus, during one roll rotation, there is once an excitation force which causes a strong characteristic frequency oscillation of the roll. Em. at critical speed, the excitation magnification factor is at its highest.

At speeds below the critical velocity, there are narrow resonance points where the amplitude of the oscillation is clearly increased. For example, at a semicritical speed of ί 25, the rotation speed of the roll is half of its characteristic ™ frequency. In this case, a disturbance that occurs twice during roll rotation is the excitation. Typical excitations at a semicritical drive speed o are, for example, bearing errors or roll bending stiffness variations. Similarly, problems such as the so-called one-third critical speed also cause problems. For the purposes of this application, critical-co at that rate refers to both the critical rate and all critical partial rates.

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The so-called critical velocities. Bypassing resonance oscillation speeds generally causes a variety of production efficiency problems in the papermaking process, such as breaking the paper web. Despite the known problem, it is often impossible to completely avoid these problematic speeds, since different rollers have different vibration characteristics and, moreover, the conditions causing vibration 5 vary. Usually, however, efforts are made to minimize problems caused by vibrations. In this case, avoiding the critical speeds that most disrupt the process generally means that the process speed has to be clearly reduced, even several hundred meters per minute, below the optimum speed, which weakens the speed. machine efficiency.

As the roll speed increases, the specific roll frequency should be increased to prevent critical speeds from being reached. This can be somewhat influenced by prior art solutions either by reducing the mass of the roll or by increasing its stiffness, i.e., for example, by increasing the diameter of the roll, whereby the stiffness of the roll increases proportionally more than its mass. However, such a solution is difficult, e.g. due to rising ship costs. Moreover, such a solution is not suitable for solving the problems of existing rolls.

This invention is particularly directed to curved rollers on paper machines and paper finishing machines. The prior art has found no workable solution to the vibration problems of such curved rollers, but the only way to avoid the problems caused by vibration has been to provide for the forbidden driving areas, i.e. the so-called "bumps". avoiding critical speeds. Em. as a result of avoiding forbidden driving areas, the paper machine often has to reduce the speed of what would be the actual machine speed without the above problems because of the g problems caused by the curved rolls alone. Such a drop in the running speed of the paper machine as a result of vibrations of the curved rollers may be inferior to 200-300 m / min. As a result of such a drop in speed, the paper machine production efficiency drops substantially.

3

There would thus be a need in the industry for a solution that could solve the problem of oscillation of curved rolls by raising the speeds of the paper machine to critical speed ranges and over critical speed ranges without causing the process vibrations such as paper web breakage.

BRIEF SUMMARY OF THE INVENTION It is an object of the present invention to solve the above-mentioned oscillation problem so that the speeds of curved rolls on a paper machine or paper finishing machine can be increased without the process problems caused by the vibrations of the rolls. To this end, a new fastening member solution is proposed, particularly for curved rollers. Also provided are arrangements for controlling the vibration of curved rolls.

15

In the embodiment shown, the curved roll is secured at both ends by the fastening members so that said fastening members can form two separate support points at each end of the roll, wherein said support points support and hold the roll. Most preferably, the other support points of the curved roller 20 are located inside the actual mounting structure. Thanks to the features of the new fastening solution, the vibrations of critical roll speeds can be moved to different speed ranges so that they no longer interfere with the process. This eliminates the need for drive speed drops due to problems with curved rollers. The fastening elements of the solution can be added to both paper machines and paper finishing machines not only for new curved rolls, but also for existing curved rolls o, which can increase the speed of the paper machine by a reasonable investment.

The curved roll fastening member as well as the arrangement and method of controlling the oscillation of the curved roll, as disclosed, are based on controlling and adjusting the inherent frequencies of the roll so that the critical speed ranges of the roll are preferably raised as the near running speed approaches 35. These critical speed ranges are most preferably restored after the critical speed range has been safely bypassed.

The fastening element according to the invention is set forth in claim 1. The arrangement for controlling the vibration of a roll according to the invention is set forth in claim 7. The method of controlling the vibration of a roll according to the invention is further described in claim 11.

DESCRIPTION OF THE DRAWINGS

The invention will now be described in more detail with reference to the accompanying drawings, in which Figure 1 shows an arrangement for controlling the vibration of the roll 15, Figure 2 illustrates an arrangement of Figure 1 with a separate slant, and Fig. 3 shows a detailed structure of one.

DETAILED DESCRIPTION OF THE INVENTION "25 For the sake of clarity, the prior art first fasteners 38 or first fasteners 38 and new types of separate fasteners adjusting the critical vibration range of a roll are used in the prior art. fastening means 39 or other 30 support points 39.

It should be noted that in this application the terms first fastening members 38 and second fastening members 39 do not only mean separate fastening members 38, 39, but both said fastening members 38, 39 can be integrated into one fastening member assembly. Hereby, the term first anchorage members 38 denotes first anchorage points for curved roll and second anchorage means 39 for a second anchorage for use in vibration control in a system wherein one attachment member 5 forms both anchorage points 1 and 2. That is, notwithstanding It should be noted that the fastening members 38, 39 may be not only separate fastening members but also subassemblies of one fastening member.

10

For the purposes of this application, a papermaking machine refers to a machine whose raw materials consist of a network of cellulose-based fibers and / or other fibers, which may contain substantial amounts of, for example, various fillers, coatings, Kemi-15 cabbages and water. The end product most commonly obtained from the paper machine of the application is paper, board, wood plastic composite or the like.

For the purposes of this application, paper-finishing machines refer to all 20 machines that can be used for finishing a paper-made product. Such machines include a super calender, a coating unit and a winder.

Figure 1 shows an example solution of an arrangement for solving oscillation problems of a curved roller ß 25. The figure shows the curved roll 37, the first fastening members 38 of the curved roll and the second fastening members 39 of the curved roll 9.

o £ The curved roller 37 shown in the figure is involved in the papermaking process.

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30 divisible curved rolls, which can be mounted, for example, on a press section or dryer section of a paper machine, or on a paper finishing machine

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§ for example a supercalender or a winder. Most preferably, the aforementioned curved roll 37 is located on the press section of the paper machine, acting as a spreading roll.

The curved shaft 37 of the curved roll 37 is preferably fixed 6 such that the shaft itself does not rotate, but the periphery of the roll rotates about said axis.

The main function of the curved roll 37 is in most cases to take care of the tension 5 and to extend the track over the roll so that the track remains straight. The main functions of the curved rollers 37 remain the same whether the felt is tension controlled and / or applied to paper and / or paper.

The first fastening means 38 may be any suitable fastening means for fastening a curved roll. Preferably, the first securing members 38 attach the curved roll 37 to the papermaking machine substantially at the ends 37a of said roll forming the first support points of said curved roll. Each individual curved roll 15 37 is held substantially locked in position by these first fastening members. These first fastening means 38 are not suitable for controlling vibration problems of a curved roll.

By the second fastening means 39 in this application are meant the elements forming the second support points, which are located at the ends 37a of the substantially curved roll 37. Preferably, the second securing members 39 are located within the region between the first securing members 38 of the curved roll 37, but still substantially within the ends of the roll 37, with one piece of the second securing member 39 located at each end 37a of the curved roll. The second fastening members 39 may also be disposed opposite to the first fastening members 38, i.e., the first fastening members 38 of the roll 37 being located within the area between the second fastening members 39. In addition, it is possible, although not equally advantageous, for the fastening members to have a different order on the ends 37a of the roller roll 37.

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00 § With the other attachment means 39, i.e. the other attachment points ™ of the curved roller 37, the curved roller is stiffened at one of its other support points so that the vibrations of the roller are substantially damped.

35 7

The exact location of the second securing members 39 with respect to the first securing members 38 is generally dependent, among other things, on the structure, location and size of the curved roll 37. The center line 39a of the fastening members 39 is preferably located at least 20 cm from the central 5 line 38a of the fastening members 38, preferably 20 to 50 cm and more preferably 25 to 45 cm from the center line 38a.

The fastening members 38 and 39 may, as previously mentioned, be subassemblies of one separate fastening member, whereby one separate fastening member 10 is capable of forming two separate support points for the curved roller 37. Such a solution is formed, for example, also, for example, the attachment means 38 and 39 to each other by means of fastening plates or similar fastening solutions 15. Here, of course, the spacing of the center lines of the fastening means refers to the spacing between the center lines of the support points 38, 39.

Advantageously, the control of the vibrations of the curved roll 37 by the fastening members 20 shown is preferably that the locking of the other fastening members 39 is preferably kept open in those driving situations where the critical driving speed of the curved roll 37 is not close. As the critical travel speed of the curved roller 37 approaches, the two securing members 39 are preferably locked around the curved roller 37 in substantially the same ai-t? 25, whereby the said roller stiffens so that the said roller the Critical Roll Speed ™ moves significantly above the previous critical speed range. If the latches 9 are maintained throughout the driving event, for example, an increase in temperature during start-up may cause problems with the thermal expansion.

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30

When the critical travel speed of the curved roll 37 has been raised by the fastening member 39 to a substantially greater travel speed range, the speed of the curved roll 37 can be safely increased so that the running speed of the curved roll 37 reaches and desires 39 blocked critical passage speeds. If the driving speed of the curved roller is to be kept at this so-called. in the critical driving speed range to be bypassed, the retaining means 39 are held locked as long as the driving speed is desired to be maintained within this range. If, on the other hand, the driving speed 5 of the curved roller is to be raised even further than this speed range, the locking of the second securing means 39 can be released when this previously critical driving speed has been safely exceeded.

By operating in the aforesaid manner, all the vibrations caused by the critical driving speeds otherwise disturbing the process are kept at a safe distance from the arcuate roller. This oscillation adjustment can, of course, be made for each individual critical travel speed range of the curved roller 37 so that all of the above critical travel speed ranges can be safely bypassed. In addition, this adjustment of the critical speed range 15 can be made individually for each individual curved roll on a paper machine or a postprocessing machine so that despite the varying vibration speeds of the curved rolls, the vibrations of all curved rolls on the machine can be controlled at all running speeds.

20

If it is desired to increase the travel speed of the curved roller 37 to one or more critical speeds, the locks of the second securing members 39 are preferably locked whenever approaching the next critical travel velocity range and respectively the locks of the aforementioned securing members 39 are unlocked for 25 min. van, the '' natural '' critical driving range. In this case, it is always possible to safely reach each so-called. above the natural critical speed range o such that it is further possible to decide in each case whether the driving speed is to be maintained at the speed thus achieved or whether the speed 30 is to be further increased. Thus, in both of these alternatives, the oscillations of the curved roll 37 are still controlled and do not interfere with the process g.

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Em. the operation, that is, locking-35 of the second fastening members 39 of the curved roll 37 when approaching the critical speed of said roll 37 and unlocking the other fastening members 39 after passing the critical speed, is suitably implemented each time approaching a critical travel speed range. possible speeds of the paper machine or paper finishing machine. Delivered in this manner, the previously problematic critical speeds of curved rollers 37 can be reliably and safely exceeded.

The curved roller 37 is preferably locked by the other fastening means 39 on both sides symmetrically. If the aforementioned roller 37 is locked asymmetrically 10, for example, so that it is locked by the second fastening member 39 only on one side of the aforementioned curved roller 37, the asymmetry of the fastening can reduce the production efficiency e.g. with the increasing need for replacement of blankets.

The locking and unlocking of the other securing members 39 during the papermaking or postprocessing process can be done either automatically or manually. The anti-vibration arrangement can be incorporated into the rest of the machine automation system, for example, in connection with new roll deliveries, so that the anti-vibration arrangement itself takes care of passing the critical running speed points of the 20 curved rollers. This way, the machine personnel themselves do not need to pay more attention to these critical speed ranges.

Sometimes, for example, to add an anti-vibration arrangement as illustrated to an old curved roller 37 ™ in operation on a machine where sufficient automation is not readily available, it may be most cost-effective to open the other attachment means 39 and locking manually.

In this case, the machine personnel will close and open the second fastening means 39, known as the so-called. for skipping the natural critical roll speeds of the roll.

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S The stiffening locking position of the curved roller 37, that is, the position in which the aforesaid roller is engaged.

Preferably, the roll is locked by means of the second securing means 39, 35 can be selected preferably in two different ways. A first preferred way is to provide the curved roll 37 itself with the so-called. to look for its natural position within the second engaging means 39. This means that the curved roller 37 is arranged to pass through the second fastening members 39 to the first fastening members 38, which first locking members 38 initially lock the roll 5 in place. Thereafter, when the curved roll 37 is locked by the first fastening members 38, it is seen what the position of the roll in this first locking relative to the second fastening members 39 is then stiffened here by a so-called. to their natural position by the other fastening means 39 whenever 10 natural driving speed ranges are exceeded.

The second securing members 39 may also be located behind the first securing members 38, i.e., on the end side of the roll 37. In this case, the roller 37 is of course set to pass through the first fastening members 38 to the second fastening members 39. Similarly, the first fastening members 38 and the second fastening members 39 may be part of a larger assembly of fastening members.

Another preferred way to select the locking position of the curved roll 37 is to first place the curved roll 37 first to pass through the second securing members 39 to the first securing members 38 and to lock the roll by these first securing members 38. Thereafter, the curved roll 37 may be so-called. for the natural critical driving speed ranges, the two second fastening means 39 fasten to a predetermined, not necessarily 25 so-called. in its natural position. This is done by tightening the curved roller 37 locked by the first fastening means 38 of the en-o ™ to the desired position by the second fastening means 39 such that said roller cannot substantially oscillate. In most cases, if there are no specific reasons g for the rest, it is most advantageous to perform the position selection 30 and locking of the curved roller 37 in the first manner such that the curved roller 37 is stiffened to its natural position.

As in the first preferred locking position selection mode, in the second preferred locking position selection mode, the second securing members 39 may alternatively be located behind the first securing members 38, i.e., at the end of the roll 37. In this case, the roller 37 is naturally set to pass through the first fastening members 38 to the second fastening members 39. Both ways can also be used in cases where the first fastening members 38 and the second fastening members 39 are not loose fastening members but part of a larger fastening member.

By performing vibration control using a symmetrical arrangement, the curved roll 37 can be driven at a desired travel speed 10 without the forces required to stiffen said roll 37 to negatively impact the felt 37 or the paper over the roll 37 itself or roll 37 as is easily achieved. to one side.

The second securing members 39 do not substantially affect the operation of the paper machine or paper finishing machine except by controlling the vibrations of the curved roll. This is due to e.g. that the second fastening means 39 are preferably kept locked only when approaching and bypassing the so-called. natural critical driving speeds.

Because the fastening members 39 are most preferably open and when the roll (e.g., its position) is adjusted and when not operating near critical travel speed ranges, the effect of the fastening members 39 on the roll operation is small except for vibration control.

Fig. 2 shows a constructional solution of a mounting member 39 of the arrangement of Fig. 1 according to a preferred embodiment. The figure shows, inter alia, a locking ring 8, an outer frame half 9, an inner frame half 10, three locking cylinders 40 and legs 41.

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The second securing member for controlling the vibrations of the curved roller 37 comprises at least one frame member. Preferably, the second engaging member 39 comprises, as shown in Figure 2, two body members, i.e., an outer body member 9 and an inner body member 10.

35 12

The location of the locking ring 8 is preferably between the frame halves 9 and 10 as shown. Preferably, the locking ring 8 is shaped such that the locking cylinders 40 are capable of locking the locking ring 8 to a desired location against the curved roll 37. Em. As a result of lu-5, the structure of the curved roll 37 becomes more rigid. The locking ring 8 preferably comprises one continuous, adjustable ring. The locking ring 8 may comprise not only the aforementioned one continuous ring, but also several separate parts. Such a solution is, for example, a locking member 8 formed of at least two separate structural members, in which the individual structural members are preferably wedge-shaped. When the second clamp member 37 of the curved roll 39 of the oscillation control, op. 37 end 37a of the roll is preferably controlled to pass through the locking ring 8 inside the inner circumferential side.

Preferably, at least one or two locking cylinders 40 are provided in one fastening member 39, more preferably at least three are provided to provide a sufficiently rigid fastening of the curved roller 37 to dampen vibrations. Most preferably, the above mentioned locking cylinders 40 are exactly 3 pieces. Most preferably, the lock cylinders 40 are located at substantially equal intervals as shown in Figure 2. A preferred example of a set of locking cylinders formed by three locking cylinders 40 and a more specific construction thereof is shown in connection with Figure 3.

The stiffening of the curved roll 37 by means of the second securing means 39 can be accomplished not only by the locking cylinder set 40 but also by the use of other types of locking means, such as, for example, so-called pressure lock 0.

£ 30 The second securing member 39 is secured in place to a paper machine ^ or a postprocessing machine by some prior art securing means. The attachment of the fastening member 39 to the machine structure is preferably made from the lower part of the fastening member 39, most preferably the legs 41 of the fastening member 39.

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Figure 3 shows an example of a more detailed construction of the second fastening member 39 of Figure 2. The most important parts shown in Figure 3 and in Figures 1 and 2 are listed in Table 1. Unless otherwise stated, the corresponding parts are shown in Table 1. the references in Table 1 can be found at least in Figure 3.

5

It is self-evident that the members mentioned in Table 1 are only some possible alternatives to the structural members of the second attachment member 39. Therefore, the individual parts mentioned in the table can, of course, be replaced by other bodies suitable for the invention without changing the idea of the invention. As an example, it goes without saying that e.g. The KK screw could also be replaced by another fastening means according to the prior art.

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Table 1. The references used in Figures J__Kumipalje__23 arm ohjain_ _2__Kumipalje__24 Tulppa_ _3__Mäntä__25 Suutin_ _4__Lukitusvarsi__26 arm pyyhkijä_ _5__Ohjausholkki__27 MM-ruuvi_ _6__Lukitussylinterin collar 28 MM-ruuvi_ 1___Lukkokannakkeen ball 29 MM-ruuvi_ _8__Lukitusrengas__30 MM-ruuvi_ _9__Ulompi body half 31 MM-ruuvi_ 10 The inner frame half 32 MM-ruuvi_ 11 __Stepped locking arm 33 O-ring_ 12 Cover__34 O-ring_ 13 Outer bellows ring 35 Piston seal_ 14 Inner bellows ring 36 Shaft seal __gas___ 15 Shank rotation lock 37 Curved roller (shown in ____ Figure 1) _ 16 Cylinder 37a Curved roller end ____ (shown) ) _ 17 Interconnecting tube 38 First attachment member for the curved roller ____ (shown in Figure 1) _ „18 Spring pin 39 Second attachment member for the curved roller ό 19 Washer 40 Locking cylinder (shown ^ ____ in Figure 2) _ ° 20 Washer 40a Toothed locking cylinder (______). 11) _ ^ 21 Connector 41 Legs for Locking Elements ( shown in Figure 2) _ o 22 Slide ring___ 15

The example of Fig. 3 shows, inter alia, three locking cylinders 40 according to a preferred embodiment, with possible components. When connected in series, these three locking cylinders 40 form a set of locking cylinders which engage the locking ring 5 securely on the curved roll 37 so that the said roll 37 is stiffened as desired.

The detailed construction of the locking cylinder 40 preferably includes e.g. cylinder 16, piston 3 with seals 35, locking arm 4, 11 and guide sleeve 5. In this example, the individual locking cylinders 40 are connected to one another by means of connecting tubes 17, which connecting tubes 17 are connected to locking cylinders 40 by means of connectors 21.

Preferably, at least one of the locking cylinders 40, most preferably exactly one, is serrated. For example, the toothing can be implemented by using a stepped locking lever 11 containing a spring pin 18 in the locking cylinder. This toothing solution may be inserted into any one of the locking cylinders 40 of the fastening element 39, one or more of the above locking cylinders.

20

The purpose of the serration is to secure the locking ring 8 securely and tightly around the curved roller 37 so that the said roller 37 becomes stiffer. Further, the purpose of the serration is to perform said fastening so gently that the fastening process t of the curved roll 37 does not? 25 adversely affects the operation of the aforementioned roller 37 and thereby the operation of a paper machine or paper ™ finishing machine.

n o i o 37 ns. The stiffening process preferably proceeds such that in the initial stage, the locking ring 8 is guided by the toothed lock cylinder 30 40a and other lock cylinders 40 following the toothed lock cylinder firmly to the curved roll 37. When all the m tightens tightly around the locking ring 8, tightening the curved roll 37 in place so that the curved roll stiffens to the desired position within the locking ring 8.

16 As a result of the stiffening of the curved roller 37, the above-mentioned critical running speed ranges are shifted forward to higher running speeds.

In more detail, the stiffening roller stiffening process preferably proceeds as follows: 1. The teeth of the toothed lock cylinder 40a are gradually tightened so that by the action of the aforementioned toothed lock cylinder 10, the locking ring 8 is moved onto the curved roller 37.

2. After the toothed lock cylinder 40a has moved the locking ring 8 onto the curved roll 37, the resistance 15 provided by the said roll becomes so large that the said toothed locking cylinder 40a begins to move other, more movable locking cylinders 40 which are not yet. roller 37 resistance.

3. The toothed locking cylinder 40a pulls all of the aforementioned lightweight, movable locking cylinders 40 evenly onto the locking ring 8, which, by the action of the locking ring 8, is uniformly secured to the curved roll 37, its head 37a. The movement of the lighter movable locking cylinders 40 is continued until each locking cylinder 40 encounters a resistor 9 produced by a substantially identical curved roller 37, which resistor is at least equal to the resistor 0 in step 1.

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4. When the resistance caused by each locking cylinder 40, 40a caused by the stiffening curved roll 37 is at least equal to the resistance provided by the roll 37 referred to in item 1, the toothed locking cylinder 40a continues to tighten each locking cylinder 40, 40a continuously. 8 around. This is continued until the locking ring 8 secures the curved roller 37 with sufficient force to achieve the desired force.

5. As a result, the locking ring 8 is tightened around the end 37a of the curved roll 5 37 so that the curved roll 37 is now substantially stiffened.

The control events of the second attachment means 39 located at both ends 37a of the curved roll 37 are preferably integrated such that the aforementioned second securing means 39 of both ends 37a of the 10 rolls operate substantially simultaneously in the opening and locking events. The curved roll 37 is then stiffened and released by both fastening members 39 at the same time, thereby avoiding possible problems in the process caused by asymmetry.

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As mentioned earlier, the locking ring 8 is preferably positioned between the two body parts of the fastening member 39, the inner body half 10 and the outer body half 9. The locking ring 8 is preferably so-called. floats in place between these two hull halves. The locking ring 20 then moves gently in the so-called curved roll 37 of the toothed locking cylinder 40a. to the natural locking position, in cases where the aforementioned curved roller 37 is to be stiffened here. in its natural position. If the roll is to be stiffened to another predetermined position, the locking ring 8 is moved during locking to the position required by this predetermined position.

m o i o In order to provide sufficient flexibility in the selection of the locking position * for the locking ring, the clearance of the locking ring 8 is preferably at least 1 mm, more preferably at least 2 mm. A suitable margin is

Sj is often, for example, 1 to 5 mm, in most cases sufficient clearance is already 2-4 g mm. Due to the possibility of adjusting the position of the locking ring 8, the position and stiffness of the arcu roller can be adjusted without having to change the position of the attachment member itself.

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The fastening means 39 shown affect the characteristic frequency of the curved roll 37 by damping the vibrations from its own structure. The second attachment means as illustrated are suitable for use in vibration control on all curved rollers, both on board 5 and paper finishing machines. They usually solve the most problems affecting production efficiency when used with curved rolls in the paper machine press area.

The solution shown is suitable for use with various curved rolls 10, regardless of the length, diameter or radius of curvature of said roll. Since the second securing means preferably releases the second securing of the curved roll whenever the travel speed of said curved roll is outside the critical travel speeds, any adverse effect of the operation of these other securing members on the curved roll is minimized while at the same time adversely affecting the vibration. can be prevented. In addition, the problems of asymmetry in the attachment of the curved roller are avoided, as the curved roller is preferably always substantially symmetrically fastened so that the two other fastening members operate simultaneously with each other.

The solution described above can be installed not only on new curved rollers during their installation, but also on existing curved rollers on paper machines or paper finishing machines. Secondly, the second attachment means as shown is subsequently retrofitted to the curved rollers already present in the packing machine. This makes it possible to achieve a new driving speed class with these old 0 curved rollers.

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The fastening element for vibration control, as shown, may be formed not only by the means mentioned in the examples, but also by using other suitable structural parts. Thus, the invention is not limited to the examples set forth in Figures 1-4 and in the foregoing description, but instead is characterized by what is set forth in the following claims.

Claims (16)

A fastener (39) for controlling vibrations of a bombed roller, which fastener is intended to be positioned as a fastener for a bombed roller (37) placed in a paper machine or in a paper finishing machine and supported at their two ends with first and second supporting points, which fastener (39) is either a separate fastener or a part of the fastener unit and comprises a body part to be placed around the end (37a) of the bombed roller (37), characterized by said fastener (39) further comprising in connection with the body part adapted reading means, which reading means are arranged to form in their reading position a second supporting point at the end (37a) of the bombed roller (37) so that the bombed roller (37) becomes stiffened. either. 15 Fastener (39) according to claim 1, characterized in that said reading means comprise a reading ring (8). Fastener (39) according to claim 1 or 2, characterized in that the body part comprises two body halves (9, 10). 4. Fastener (39) according to claim 3, characterized in that the reading ring (8) is positioned between the body halves (9, 10), and that the fastener (39) comprises means for moving the reading ring (8) a distance of 1-5 mm. Between the body halves (9, 10). (M o Fastener (39) according to any of claims 1-4, characterized in that the fastener (39) comprises at least three reading cylinders (40, 40a). X CC 30 Fastener (39) according to claim 5, characterized in that at least one of the m reading cylinders is toothed. LO O) O An arrangement for controlling oscillations of a bombed roller, which comprises a bombed roller (37) located in a paper machine or in a paper finishing machine, and first support points (38) for the bombed roller (37), which first supporting points (38) are positioned to support the bombed roller (37) at its two ends (37a) with first supporting points, and second supporting points (39) for the bombed roller (37), which second supporting points (39) are positioned at each end (37a) of the roller (37), characterized in that said second support points (39) comprise reading means for loading said bombed roller (37) at the other support points. Arrangement according to claim 7, characterized in that the boom prepared roller (37) is placed in the region of the pressing portion of a papermaking machine. Arrangement according to claim 7 or 8, characterized in that the first support points (38) and the second support points (39) are fixedly connected. Arrangement according to any of claims 7-9, characterized in that the other supporting points (39) comprise at least three reading cylinders (40), of which reading cylinders (40) are at least one toothed. A method for controlling oscillations of a bombed roller (37) in a paper machine or a paper finishing machine, in which method the bombed roller (37) is supported at both ends "25 with support points (38), and also comprises the bombed roller Other supporting points (39), which supporting points (39) are located at each end (37a) of the roller (37), characterized in that the method o comprises reading said second supporting points (39) around the end (37a) g of the roller so that the bombed roller (37) becomes stiffer. CL 30 12. A method according to claim 11, characterized in that the beam LO (prepared) roller (37) is read with the other supporting points (39) before said roller (37) when a running speed is critical. Method according to claim 11 or 12, characterized in that the bombed roller (37) is detached from the reading of the other support points (39) when the running speed of the machine is not in the range of a critical running speed, or substantially in the vicinity thereof. Method according to any of claims 11-13, characterized in that the reading of the second support point (39) comprises at least the following steps: 10. tensioning of teeth by the toothed reading cylinder (40a) so that the reading ring (8) is moved substantially tightly adjacent the bombed roller (37), and o tension of the reading cylinders (40, 40a) such that the reading ring (8) is substantially tightened around the end (37a) of the bombed roller and makes said roller (37) stiffer. Method according to any of claims 11-14, characterized in that the second support points (39) at both ends (37a) of the bombed roller (37) are opened and closed substantially simultaneously. Use of a fastener (39) according to any of claims 1-6 as a fastener for a bombed roller (37), wherein the bombed roller (37) is attached to its bed ends with fasteners such that the bombed roller (37) have a total of four support points such that at each ™ end of the bombed roller (37) there is a fastener (39) for the 9 bombed roller, which fastener (39) is either a special fastener o or part of a fastener unit. X cc CL CVJ CO m O) o o c \ j