FI13599Y1 - Deflection compensated roller with vibration damping equipment - Google Patents

Abstract

A deflection-compensated roll (10) with a surrounding roll jacket (12), a non-rotatable beam (14) which runs axially through the roll jacket (12) and support elements (16) which are arranged between the beam (14) and the roll jacket (12) and to which can be fed a pressure medium through lines (24) in order to direct the respective support forces towards the inside of the roll jacket (12), characterized in that in the free space between the beam (14) and the roll jacket (12) a vibration damping facility (70) is arranged, whereby vibration damping facility (70) includes at least one mass force actuator (73).

Description

Deflection-compensated roller with warp damping equipment

The invention relates to a deflection-compensated roller, a system for damping vibrations in connection with a palm bed, and a pulp machine.

In fiber web processing machines, such as calenders and film presses (SpeedSizer), the fiber web is led through the processing compression gap (nip) formed between the two rollers of the palm mat. The fiber web can be, for example, a paper web. The first roll and/or the second roll are equipped with an elastic roll cover. The unevenness of the fiber web passing through the pressing gap causes vibrations in the rollers, which lead to undulations of the elastic roller coating. This wavy is also called barring (eng. bar = stripe, line). Depending on the application, undulations can occur either due to wear phenomena and/or also due to thermal effects, so that even in connection with initially ideally round rolls, a wave pattern is created in the roll coating at a constant production rate during the use of the calender or film press. Both generation mechanisms are thus so-called self-induced oscillations.

In the case of corrugations due to wear, a trough is created on the roller coating, — when a dynamic mechanical load is applied to the roller coating, i.e. locally greater wear occurs, and a wave crest is created when dynamic release occurs, i.e. locally less wear occurs.

N In the case of undulation due to heat, due to the expansion of the roll coating 5 25 — a wave crest is created when the roll coating is subjected to a locally higher dynamic mechanical load, which results in local heating, and

N follows the bottom of the wave when the roll coating is subjected to a locally lower dynamic heat load. 3 3 30 — The initially still rough fiber passing through the compression gap between both rollers

Due to the N webs, the roller pack generates comparable noise with a wide non-specific frequency spectrum. Due to the noisy excitation of the roller package, the rollers bend to the greatest extent near the characteristic frequencies of the floor mat. Due to the feedback phenomenon caused by wear and/or heat, a wave pattern is created in the roller coating after some time, whereby the number of waves circulating along the roller's circumference is obtained from the roller's rotation speed and the characteristic frequency fg of the tread bed according to the following formula: number of waves on the circumference x roller's rotation speed = characteristic frequency fs

In the case of undulations due to wear, the frequency of the next whole number multiple of the roll rotation speed is slightly lower and in the case of undulations due to heat a little higher than the characteristic frequency fg of the floor mat, due to the 180 degree phase shift between the excitation and the response when the characteristic frequency is exceeded.

In practice, undulation due to heat only occurs when using soft — elastomeric plastic coverings, which have a high heat loss coefficient due to the damping of the material, which leads to self-heating of the roller coverings.

For this reason, plastic coatings only have a limited load capacity and therefore they are used in film presses (SpeedSizer) usually only together with conventional rollers that do not have deflection compensation. Vibrations occurring in the film press can be compensated for by means of vibration actuators, which are arranged directly in the bearing housing of the hydraulically adjustable roller. Due to the soft plastic coating, the characteristic contact frequency resulting from the counter-phase movement of both conventional rollers is in the range of about 50 Hz and is thus relatively low.

S nen, so that the waviness of the plastic coatings can be affected by the actuators in the roller bearings a 25 —. <Q

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N If, however, it is intended to apply other materials to the fiber webs under high pressure

For e.g. starch, especially to improve the fiber quality, the contact pressure between the rolls must be increased so that the material can penetrate deep into the fiber web. To produce increased contact pressure in the compression gap

Higher line forces must be applied to N (nip), which cannot be realized with conventional rollers and general plastic coverings. In order to achieve an even distribution of the pressing stress over the entire width of the fiber web, at least one deflection-compensated roll is therefore used in the film press. Due to higher compressive stresses, harder plastic coatings are also used, for example rollers with a coating consisting of an epoxy resin-based composite material, and a harder counter roller equipped with a ceramic coating.

Even with a film press designed in this way, as well as with calenders, undulation due to wear occurs in the case of a roller equipped with a plastic coating. However, due to the harder plastic coatings and the changed roller structure, where the roller pack consists of a deflection-compensated roller and a conventional counter roller, the form of contact vibration that causes ripples appears only above a frequency of 100 Hz. The contact vibration form is essentially the result of the anti-phase motion of the fixed axis of the deflection-compensated roll relative to the conventional counter roll. As a result, strong pressure fluctuations occur in the pinch of the floor mat, which, together with material such as starch, with rye-woven fiber fabric, produce a wear pattern on the roller coating.

DE 38 02 234 C2 introduces a deflection-compensated roller with a fixed support and a tubular roller shell rotating around it. Between the bracket and the roller shell, a roller shell is arranged to support hydrostatic pressure elements, which are controlled movably in the control arrangements of the bracket. For the passive damping of the roller shell, vibration-damping pieces with vibration-damping choke points for the hydraulic pressure medium are arranged on the deflection-compensated roller support. < + 25 DE 102019 100 274 A1 introduces a semi- = active vibration damper intended for a deflection-compensated roller, which is regulated by means of the transfer element

With the help of N for a certain natural frequency.

T a 3 EP 0 854 233 A2 brings out a method for damping the contact vibrations of the rotating rollers 2 30 in a paper machine, when the rollers are attached from the end sides to the

N in slots and at least two rollers together form a nip. Active damping is provided by actuators connected to the bearings, whereby the actuators prevent contact vibrations by means of phase-shifted counter-vibration.

EP 1731 669 A1 introduces a deflection-compensated roller with active vibration damping or damping. In this case, the damping is implemented with piezo elements that affect the support elements. Although this type of vibration damping — technically works well, it is very expensive and cumbersome.

The objective behind the invention is now to provide means to avoid undulation (barring) caused by wear and/or heat, especially in the plastic coating of a deflection-compensated roll intended for use in a film press, which means are safe and reliable and can be implemented simply and also cost-effectively.

According to the invention, this goal is achieved for the deflection-compensated roller with the characteristics of protection requirement 1, for the system with the characteristics of protection requirement 10 and for the pulp machine with the characteristics of protection requirement 11.

Other protection requirements apply to advantageous embodiments of the invention.

According to the first aspect, the invention provides a deflection-compensated roller. A deflection-compensated roller comprises a surrounding roller shell, a non-rotating beam passing axially through the roller shell, and support elements arranged between the beam and the roller shell, which can be supplied with pressure medium via cables to apply the respective support forces to the inside of the roller shell. In this case, the wires could at least partially be placed in the axial drilling hole of the beam.

N The vibration damping equipment is arranged in the free space between the beam and the roller shell, whereby the vibration damping equipment comprises at least one mass = force actuator.

Al = a In the application, the term backup damping equipment is used. In the equipment according to the invention, active anti-vibration prevention can take place with the help of a mass-power actuator 230. This can also be called vibration damping. Below ha-

In this glossary, the terms "vibration damper" and "vibration damper" are used synonymously, unless explicitly stated otherwise.

The advantage of the mass-force actuator provided according to the invention is that it can be used to achieve active damping or deadening of vibrations.

In contrast to known piezo elements, such an actuator can also be implemented clearly more inexpensively. In addition, one operating device is not needed for each support element.

In this case, it is especially possible that the deflection-compensated roller can manage with only one mass force actuator. Namely, with one actuator it is possible to dampen or kill several overlapping vibrations at the same time.

The deflection-compensated rollers according to various aspects of the invention may be suitable and provided especially for use in fiber web coating equipment. A favorable application case is use in a film press. — In a further development, it has been achieved that the mass-force actuator comprises a moving mass, which is connected to the beam via a spring mechanism, and an actuator, whereby the moving mass can be made to oscillate due to the actuator force applied by the actuator. — In one advantageous embodiment, it has been achieved that the actuator itself forms a mass. < This applies in particular to the motion compensation of the mass force actuator in the rest position

S following formula:

S 25

O mä td) * 7 + G 2 =F= experiment I

E where 10 I: used current [A] 3 Kart: Motor constant

O 30 c4: spring stiffness constant > dj: damping constant

21, 21, 23: positive calculation direction of movement direction, speed and acceleration

In one advantageous embodiment, it has been achieved that the mass force acting device is arranged in the middle of the beam.

Although a single mass-force actuator is often sufficient, depending on the requirement, it can also be advantageous for the vibration damping equipment to comprise or consist of several, especially two, three, four or more mass-force actuators.

Advantageously, it has been achieved that at least one vibration sensor is arranged in the beam and/or the support element and/or the roller shell. — Because the support elements are very rigidly connected to the roller casing, the sensor attached to the support element can detect the vibrations of the casing very well and reliably. And attaching the vibration sensor on top of the support element is usually simpler to implement than on the sheath. Due to inevitable wear and tear, the roller casing — and thus also the sensors attached to it — must also be replaced from time to time. If, on the other hand, the vibration sensors are arranged inside the roller on top of one or more support elements, they can still be used when changing the jacket.

Depending on the application, it may be advantageous to provide several vibration sensors on or inside the deflection-compensated roller, for example 2, 3 or 4 vibration sensors

S turia.

S 25

N In particular, the vibration sensor is designed as an acceleration sensor.

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= In accordance with the second aspect, the invention provides a method for damping vibrations

In order to process fiber pulp with the first roller and the second roller,

S 30 tun in connection with the palm bed. The fiber web is guided through the compression gap formed between the first roller and the second roller, whereby one of the rollers is formed as a deflection-compensated roller according to the first aspect. The method includes the following method steps: measuring the vibration of the deflection-compensated roller beam and/or roller shell with at least one vibration sensor; generating a control signal for the actuator of the mass-force actuator of the vibration damping equipment based on the measured vibration; the actuator is controlled by means of a control signal in order to dampen the vibrations of the roller pack, especially the beam.

In a further development, it has been achieved that the control signal is formed in such a way that at least one characteristic frequency of the floor mat and/or the deflection-compensated roller and/or the beam of the deflection-compensated roller is damped.

In one preferred embodiment, it has been achieved that the control signal is formed in such a way that at least one vibration is damped, which consists of at least most of the characteristic frequencies of the roller package and/or the deflection-compensated roller and/or the beam of the deflection-compensated roller.

With the help of the mass force actuator, it is very simply possible to dampen or kill several different frequencies. The use of an additional actuator for this is also not necessary.

In another embodiment, it has been achieved that the data analysis device uses a software application equipped with artificial intelligence algorithms for frequency spectrum analysis and/or control signal generation. 3 Artificial intelligence algorithms preferably include deep learning (Deep Learning) © neural networks and/or converters equipped with encoders and decoders and/or

E with reinforcement learning (RL, Reinforcement Learning) agents. 3 = According to the third aspect, the invention causes the system to vibrate

S for damping for fiber pulp processing with the first roller and the second roller > in connection with the mentioned palm mat. The fiber web is guided through the compression gap formed between the first roller and the second roller, whereby one of the rollers is formed as a deflection-compensated roller according to the first aspect.

The system comprises a vibration sensor configured to measure the frequency spectrum of the deflection-compensated roller beam and/or the roller shell, and a data analysis device configured to analyze the frequency spectrum, generate a control signal for the actuator of the mass force actuator of the vibration dampening equipment, and control the actuator with the help of a control signal to dampen the vibrations of the floor bed, especially the beam.

According to the fourth aspect, the invention provides a vibration dampening device especially for use in the free space between the beam and the roll shell of a deflection-compensated roll. The vibration damping device comprises at least one mass-force actuator, whereby the mass-force actuator comprises a moving mass that can be connected to the beam via a spring mechanism, and an actuator, whereby the moving mass can be made to oscillate due to the actuator force applied by the actuator.

According to the fifth aspect, the invention provides a pulp machine for processing fiber webs. The pulping machine comprises at least one palm bed with a first roller and a second roller, in which case the fiber web is guided through the compression gap formed between the first roller and the second roller, and in which one of the rollers is formed as a deflection-compensated roller according to the first aspect.

In advantageous embodiments, it has been possible to achieve that the pulp machine is over-

Coating equipment, in particular a film press, wherein the coating equipment is configured to apply the coating material to the fiber web in the pressing gap. - The coating agent can be a starch solution in particular.

T a 3 In terms of the invention, it is advantageous in this context that the rollers of the coating equipment, such as 2 15 — for example, a film press, generally have relatively large diameters,

N which can be at least 1,000 mm. In such rollers, there is sufficient installation space available for the vibration damping equipment. The existing rollers can therefore still be used. The retrofitting of existing coating equipment is thus possible very simply.

On the other hand, in other pulp machines, such as calenders, the diameter of the rollers is usually clearly smaller. Creating a mass force actuator therefore requires a bit more effort here, as larger rollers (and thus also more expensive rollers) must be used.

In addition, it has been possible to achieve that the first roll and/or the second roll is adapted — as a hard roll. Hard rollers can be considered rollers with a surface hardness of 55

ShoreD or harder, especially 60 ShoreD, 70ShoreD, 80 ShoreD, 90 ShoreD or harder.

Especially when two hard rollers are used, the tendency of the system to vibrate is — very large, so that the vibration dampening device according to the aspects of the invention is particularly advantageous here.

Coating equipment with two hard rollers, for example the so-called "hard nip sizer" (hard nip surface gluing device), has only recently entered the market. In common film presses, which have at least one comparatively soft roll, the theft problem is mostly not so bad. so far, there have also been no tools for deadening the vibrations.

In addition to this, it has proven that it is almost impossible to give up the use of a deflection-regulated roller in order to guarantee an unchanged profile with a hard-knife surface lubricant.

N in the compression slot of the seasoning device. 3 25 © The inventors have noticed an increase in the hard nib surface gluing device

N needed for vibration damping and found an inventive solution by using a mass-force actuator in the also necessary deflection-regulated 3 rollers. 5 30

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N In accordance with the sixth aspect, the invention provides a computer program product comprising an executable program code that performs the method according to the second aspect.

In the following, the invention is explained in more detail with the help of exemplary embodiments shown in the drawing. — In them: figure 1 shows a schematic view of a deflection-compensated roller according to the invention;

Figure 2 shows a schematic view of a film press; Fig. 3 shows a schematic view of a mass-force actuator; Figure 4 shows the Bode plot in logarithmic representation; Figure 5 shows the Bode plot as a linear representation; figure 6 shows a schematic view of the system according to the invention; — pattern? shows a flowchart to explain the individual method steps of the method according to the invention.

N Other hallmarks, aspects and advantages of the invention or its exemplary embodiments can be seen from the detailed description together with the protective claim-? with you.

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Al = a Figure 1 shows a deflection-compensated roll 10 especially for use in a pulp machine intended for the production of fiber webs, especially paper webs, 2 30 — such as in a film press. The deflection-compensated roller 10 comprises a surrounding roller

N pan 12, the non-rotating beam 14 passing axially through the roller shell 12, and the support elements 16 arranged between the beam 14 and the roller shell 12 in order to apply the respective support force to the inner side 18 of the roller shell 12. The support surfaces of the support elements 16 facing the inner side 18 of the roller shell 12 and/or the inner side 18 of this shell have been equipped with a plastic coating, due to which friction and, accordingly, wear are clearly reduced. The support elements 16 can also have a basic frame made of plastic. The support elements 16 are especially formed as hydraulic support elements 16 and they are supplied with a pressure medium, especially pressure oil, by means of lines that have been at least partially placed in the axial borehole of the beam 14, in order to produce the respective support forces due to pressurization. Various support elements 16 can then be controlled individually or also in groups. The roller casing 12 is equipped with a plastic coating 28, which consists, for example, of an epoxy resin-based composite material.

Figure 2 schematically shows a pulp machine 300 in the form of a film press 300. It then comprises a palm bed with a first roller 41 and a second roller 42. Between the first roller 41 and the second roller 42, a processing-pressing gap (nip) 46 is formed, through which fiber web 45 runs. Both rollers 41, 42 are placed in an oblique position relative to each other, so that the fiber web 45 also runs in an oblique direction, preferably at an angle of about 45° with respect to the horizontal plane. However, other placements are possible within the scope of the invention. Next to the rollers 41, 42, there may be a dosing device 43 for spreading the coating material on the surfaces of the rollers 41, 42. The coating material can in particular be starch. The solid content of the starch used can be 6-25%, preferably 8-18%. In the embodiment shown here, the Dosing equipment 43 is adapted as a spraying equipment 43.

N The first roll 41 is in this context formed as a deflection-compensated 5 25 roll 10. The roll 41, 42 formed as a deflection-compensated roll 10 comprises in particular a plastic material, such as rubber, polyurethane or something else

N of a composite material, a coating consisting of and another roller 41, 42 of a layer consisting of ceramic or o metal. 3 3 30 — The compression force of the compression slot 46 can be adjusted in the range of 30-140 kN/m, preferably

N 60—100 kN/m, to apply the necessary line force to the fiber web 45. Compression

the high compressive force of the gap 46 together with the irregularities of the fiber web 45, especially due to the spreading of starch, generates contact vibrations in the range of more than 100 Hz.

In the deflection-compensated rollers 10, which are used especially in film presses 300, there is a large free space between the beam 14 and the roller shell 12 for process technical reasons.

This free space is larger than would be necessary for mechanical reasons, such as the permissible deflection and the strength of the supporting beam 14. This free space typically does not exist in a calender, because the deflection-compensated rolls are primarily dimensioned there — according to mechanical criteria to keep the roll diameter as small as possible. This free space between the beam 14 and the track shell 12 is used to arrange the sway damping device 70 according to the invention, which has one or more mass force actuators 73, directly on the beam 14. However, within the framework of the invention, it is possible to dimension the deflection-compensated roller 10 also for calendars, so that the vibration damping equipment according to the invention can be used in it.

The first roller 41 and/or the second roller 42 can preferably be formed into hard rollers 41, 42, the hardness of which can be more than 55 ShoreD, especially more than /0 ShoreD. — Figure 3 schematically shows the mass force actuator 73 of the sway damping device 70. The mass force actuator 73 comprises a moving mass 75 that can vibrate with the help of a spring device 77. The mass 75 is connected to the actuator 79, which applies force F to the mass 75. However, it has also been possible to achieve that

The N actuator itself forms a mass of 75. The actuator force F is then obtained from the used current] [A] multiplied by the motor constant kot. , Table 1 Explanations of Figure 3

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10 © 3 =! TVattenuation constant = : 5

The motion compensation of the mass force actuator 73 in the rest position is obtained according to the following formula: m, . Z + d, . 21 + C1 . z,=fF = Kane [I

In this case, ce, denotes the stiffness constant of the spring, d, the damping constant, 2; the positive calculation direction of the movement direction, speed and acceleration and F,,, the reaction force on the structure.

The Laplace transform gives the deflection z,: 7 = kart "I 1 my: s?24+ dj stag

From this, the reaction force Fa on the beam 14 of the deflection-compensated roller 10 is obtained:

Fm= —my s? 24

Ignoring the sign gives the transfer function:

Fm _ s? Kage

I S242 Fake Ware "S + Why <t

S

The frequency response in the form of an N Bode diagram for a characteristic frequency of 36 Hz, and when <t ? Saree = 0.1 and kat = 1000, is shown in Fig. 4 as a logarithmic representation and Fig-

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N 25 in 5 parts as a linear representation. 7

O In the case of symmetrically formed deflection-compensated rollers 10, the vibration damping device 70 can have only one mass-force actuator 73, which

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S is arranged in the center of the beam 14 of the deflection compensated roller 10. Due to the force F of the actuator, the mass 75 of the mass-force actuator 73 bends, which produces a reaction force F,,, directed at the beam 14, which leads to counter-vibration of the beam 14 and thus prevents undulation in the coating of the deflection-compensated roller 10.

For this purpose, the movement of the beam 14 is observed with at least one vibration sensor 80, which is specially designed as an acceleration sensor. With the help of the detected data, the vibration movement of the mass 75 can be adjusted in terms of frequency, amplitude and phase shift, so that the vibration of the beam 14 is effectively damped and reduced to a minimum.

In particular, it is possible to produce a complex vibration pattern with the actuator 79 by superimposing several frequencies and using this vibration pattern to excite the moving mass 75 so that it vibrates in this vibration pattern.

Since the vibration of the beam 14 is caused by the irregularities of the fiber web, the beam 14 is excited in a wide frequency spectrum in addition to the main characteristic frequency, which leads to overlapping vibration behavior caused by several characteristic frequencies. This eliminates the need to use multiple vibration damping devices 70 that are set at different natural frequencies of the system. — The asymmetry of the vibration modes occurs with similar characteristic frequencies close to each other, for example when a heavy gear gear is arranged on one side of the roller shell 12 of the deflection-compensated roller 10. In such a case, it may be reasonable not to place the mass force actuator 73 in the beam

N 14 in the middle and/or places one mass force actuator 73 on the sides of the beam 14. & , Figure 6 shows a system 100 for dampening vibrations for the processing of fiber mass & with the first roller 41 and the second roller 42 in connection with the palm bed 3, in which case the fiber web 45 is guided through the compression gap 46 formed between the first roller 41 and the second roller 42 2 and in which case one of the rollers 41, 42 is

N formed as a deflection-compensated roll 10. The system comprises a vibration sensor 80, which is formed to measure the frequency spectrum of the beam 14 and/or the roll jacket 12 of the deflection-compensated roll 10, and a data analysis device 90, which is formed to analyze the frequency spectrum, to generate a control signal for the actuator 79 of the mass force actuator 73 of the deflection damping equipment 70 and to control the actuator 79 with the help of a control signal in order to dampen the vibrations of the floor mat 40, especially the beam 14.

The data analysis device 90 comprises a software application 95 for the analysis of the measured frequency spectrum and the generation of the control signal. The software application 95 specifically includes artificial intelligence algorithms, such as deep learning, for example, with the help of neural networks and/or converters equipped with encoders and decoders and/or reinforcement learning (RL) agents.

A neural network consists of neurons arranged in several layers, which are connected to each other in different ways. A neuron is able to receive information from the outside or from another neuron, evaluate the information in a certain way and transmit it in a modified form from the neuron output to another neuron or hand it over as a final result. Hidden neurons are arranged between input neurons and output neurons. Depending on the network type, there can be several layers of hidden neurons.

They take care of the transmission and processing of information. The output neurons produce — finally the result and give it to the outside world. Due to the arrangement and connection of neurons, different types of neural networks are created, such as feedforward neural networks (FNN), feedforward networks (Recurrent Neural Network, RNN) or convolutional neural networks (eng.

Convolutional Neural Network, CNN). Networks can be trained unsupervised

N 20 or with guided learning. a

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O The software application 95 can also use calculation methods, such as

N averages, minimum and maximum values, lookup tables, expected value models, linear partial regression methods, Gaussian processes, fast Fourier transforms, integral and differential calculations, Markov methods, probability methods, such as Monte Carlo methods, temporal difference learning (Temporal Diffe-

N rence Learning), extended Kalman filters, radial basis functions and/or data fields.

Figure 7 schematically shows the method steps for dampening vibrations for the processing of the fiber pulp with the first roller 41 and the second roller 42 in connection with the roller package referred to. — In step S10, the vibration of the beam 14 and/or the roller shell 12 of the deflection-compensated roller 10 is measured with at least one vibration sensor 80.

In step S20, the vibration is analyzed with the data analysis device 90. — In step S30, a control signal is produced for the actuator 79 of the mass force actuator 73 of the vibration dampening device 70.

In step S40, the actuator 79 is controlled by means of a control signal in order to dampen the vibrations of the floor mat 40, especially the beam 14.

The deflection-compensated roller according to the present invention and the method can effectively combat the undulation of the plastic coating of the deflection-compensated roller by damping or compensating the vibrations caused in the floor bed, especially in the beam of the deflection-compensated roller, effectively with a vibration damping device with an active mass force actuator. The frequency spectrum is measured using a vibration sensor and analyzed with a data analysis device to generate a precisely matched control signal for the actuator to produce counter-vibrations. <

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Reference marks 10 deflection-compensated roller 12 roller shell 14 beam 16 support element 18 shell interior 41 first roller 42 second roller 43 dosing device 45 fiber web 46 handling compression gap (nip) 70 back-up damping device 73 mass-force actuator 75 mass 77 — spring mechanism 79 actuator 80 vibration sensor 90 data analysis device 95 software application 100 — system 300 pulp machine, film press <

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Claims (13)

Protection requirements 1. A deflection-compensated roll (10) with a surrounding roll shell (12), a non-rotatable beam (14) which runs axially through the roll shell (12) and support elements (16) which are arranged between the beam (14) and the roll shell ( 12) and to which a pressure medium can be fed through lines (24) in order to direct the respective support forces towards the inside of the roll jacket (12), characterized by the fact that a vibration damping system is arranged in the free space between the beam (14) and the roll jacket (12) (70), whereby the vibration damping facility (70) includes at least one mass force actuator (73). 2. Deflection-compensated roller (10) according to protection claim 1, wherein the mass force actuator (73) comprises a movable mass (75) which is connected to the beam (14) through a spring mechanism (77), and an actuator (79), and wherein the the movable mass (75) can be made to vibrate by the action of an actuator force (F) which the actuator (79) directs towards it. 3. Deflection-compensated roller (10) according to protection requirement 2, whereby the actuator (70) itself constitutes the mass (75). 4. Deflection-compensated roller (10) according to one of the protection requirements 1 - 3, whereby the mass force actuator (73) is arranged in the middle of the beam (14). x < 5. Deflection-compensated roller (10) according to any of the preceding protection requirements, O characterized in that the vibration damping device (70) comprises or O consists of a plurality, especially two, three, four or more mass force actuators (73). former LO 6. Deflection-compensated roll (10) according to one of the protection requirements 1 - 5, wherein i = 25 the beam (14) and/or the support element (16) and/or the roll jacket (12) is arranged with at least one vibration sensor (80). No. 5 7. Deflection-compensated roller (10) according to protection requirement 6, whereby the vibration sensor (80) is designed in the form of an acceleration sensor. 8. A system (100) for dampening vibrations in connection with a roll pack (40) intended to treat fiber pulp with a first roll (41) and a second roll (42), whereby a fiber web (45) is guided through a press nip (46) between the first roller (46) and the second roller (42), whereby one of the rollers (41, 42) is made in the form of a bending-compensated roller (10) according to the protection requirements 1 - 7 and comprises a vibration sensor (80) which is arranged to measure the frequency spectrum of the beam (14) and/or roll jacket (12) of the deflection-compensated roll (10), and a data analysis apparatus (90) which is arranged to analyze the frequency spectrum, to generate a control signal for the actuator (79) of the mass force actuator (73) of the vibration dampening facility (70) and to control the actuator (79) using the control signal to dampen the vibrations of the roll package (40), especially the beam (14). 9. System according to protection claim 8, wherein the control signal for the vibration dampening system (70) is configured such that at least one of the natural frequencies of the roll package (40) and/or the bending-compensated roll (10) and/or the bending-compensated roll beam (14) is subdued. 10. System according to protection requirements 8 or 9, wherein the control signal for the vibration damping facility (70) is configured so that at least one vibration x consists of at least most of the natural frequencies of the roller package (40) N and/or the bending-compensated roller (10) and/or the beam (14) of the deflection-compensated roller (10) is damped. S = 11. A fiber pulping machine (300) for treating fiber webs with at least one > 25 roll pack (40) which includes a first roll (41) and a second roll (42), = whereby a fiber web (45) is guided through a press nip (46) ) between the N first roller (46) and the second roller (42), whereby one of the rollers 5 (41, 42) is in the form of a bending-compensated roller (10) according to one of the protection requirements 1 - 7. 12. Fiber pulping machine (300) according to protection claim 11, characterized in that the pulping machine (300) is a coating plant (300), in particular a film press (300), wherein the coating plant is configured to apply a coating agent to the fiber web (45) in the press nip (46) ). 13. Fiber pulp machine (300) according to protection claim 11 or 12, characterized in that the first roller (41) and/or the second roller (42) is made in the form of a hard roller, wherein the hardness of the surface of the roller is above 55 ShoreD, especially over 70 ShoreD. <t N O N O <Q LO O I = LO O 5 O N O N I