EP2034092A2 - Agencement de cylindres - Google Patents

Agencement de cylindres Download PDF

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Publication number
EP2034092A2
EP2034092A2 EP08162400A EP08162400A EP2034092A2 EP 2034092 A2 EP2034092 A2 EP 2034092A2 EP 08162400 A EP08162400 A EP 08162400A EP 08162400 A EP08162400 A EP 08162400A EP 2034092 A2 EP2034092 A2 EP 2034092A2
Authority
EP
European Patent Office
Prior art keywords
roller
vibrations
arrangement according
roll
counter
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP08162400A
Other languages
German (de)
English (en)
Other versions
EP2034092A3 (fr
Inventor
Jochen Dr. Niemann
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Voith Patent GmbH
Original Assignee
Voith Patent GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Voith Patent GmbH filed Critical Voith Patent GmbH
Publication of EP2034092A2 publication Critical patent/EP2034092A2/fr
Publication of EP2034092A3 publication Critical patent/EP2034092A3/fr
Withdrawn legal-status Critical Current

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Classifications

    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21G—CALENDERS; ACCESSORIES FOR PAPER-MAKING MACHINES
    • D21G1/00—Calenders; Smoothing apparatus
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21G—CALENDERS; ACCESSORIES FOR PAPER-MAKING MACHINES
    • D21G1/00—Calenders; Smoothing apparatus
    • D21G1/0006—Driving arrangements

Definitions

  • the invention relates to a roller assembly having at least one roller and a counter-pressure element, wherein between roller and counter-pressure element, a nip is formed, through which a material web is feasible. Furthermore, the invention relates to a method for operating such a roller assembly.
  • the nature of the surface, and especially the smoothness of the surface, is influenced by several significant factors. This includes the pressure to which the web is exposed in the nip of the roller assembly. The temperature and the moisture content of the web are also decisive. Another influencing factor is the treatment time, ie the time required for the material web to pass through the nip and in which it is exposed to the pressure in the nip.
  • friction calenders For producing paper with a high-gloss surface, such as in playing cards, it is known to use so-called friction calenders, in which two rollers forming a nip are operated at a differential speed. In this case, slip occurs between the top or bottom of the material web and one or both rollers, which leads to a shiny surface.
  • friction calenders can only be used at relatively low operating speeds.
  • the invention is based on the object to provide a roller assembly, with a good smoothing result even at low pressure load in the nip can be achieved.
  • this object is achieved in a roller assembly of the type mentioned in that at least one roller by a rotational vibration generator in rotational vibrations at a frequency of 150 to 3000 Hz, in particular from 200 to 2000 Hz, is displaceable.
  • the rotational vibration generator thus introduces an additional, high-frequency torque oscillation into the roll. This superimposes the normal rotational movement.
  • the frequency of the oscillation in the range between 150 and 3000 Hz, wherein a frequency in the range of 200 to 2000 Hz is preferred, is significantly lower than the frequency of ultrasonic vibrations that are in the range greater than 18 kHz.
  • the smoothing of the surface of the material web is also carried out not by the introduction of a vibration pulse, as is done when smoothing by means of ultrasound, but by exploiting the slip / shear between the roller and the surface of the web.
  • the rotational vibration generator can for example initiate a pulsating, high-frequency torque in a roll neck of the roller.
  • the roller speed thus oscillates around the setpoint.
  • the Roller and the material web thereby have a periodically repeated differential speed, which leads to a slip between the roller and the surface of the material web. This achieves an improved smoothing result.
  • the necessary line load ie the pressure exerted on the material web in the nip
  • the counter-pressure element may be formed, for example in a known manner as a circumferential jacket with contact shoe.
  • the counter-pressure element is designed as a roller.
  • the counter-pressure element can be designed, for example, as a hard or soft roller, but also as a bending compensating roller or the like. Due to the counter-pressure element designed as a roller, on the one hand a sufficient line load can be generated, on the other hand the counter-pressure element also has good stability due to the high mass, so that the vibrations of the roller are transferred only to a slight extent to the counter-pressure element. Overall, the smoothing result can be further improved.
  • the rotational vibration generator is designed as a torque motor.
  • Torque motors can be very precisely controlled via the drive frequency, whereby they can generate a large torque.
  • a fast-acting frequency converter can be used, which can work in the desired frequency range.
  • the torque motor acts on a roll shell of the roller.
  • the rotor of the torque motor can be mounted, for example, directly on the roll shell. This will in particular the longitudinal extent of the roller hardly changed, so that the additional space requirement is low.
  • the torque motor acts on a drive pin of the roller.
  • the drive pins of the roller are usually used for storage and for driving the roller, so that for connecting the torque motor hardly changes are required.
  • the roller assembly has a main drive for the roller.
  • This main drive serves to generate the rotational movement of the roller.
  • the main drive may, for example, engage a drive journal of the roller while the rotational vibration generator is attached to the opposite drive journal of the roller.
  • the rotational vibration generator then need not be designed in terms of its power to the power required to generate the rotational movement of the roller, but must be able to generate only the torque oscillations. The necessary power is less than that for generating the rotational movement of the roller.
  • the main drive is formed by the torque motor.
  • the torque motor thus also serves as a rotational vibration generator and as the main drive for generating the rotational movement of the roller.
  • the use of only one common drive means that no additional space is needed.
  • the other drive components, such as a frequency converter, are only needed simply. This leads to a cost saving.
  • the roller is designed as a heating roller.
  • the smoothing result can be further improved.
  • there the surface of a heated roll exerts a greater effect on the surface of the web than the surface of a non-heated roll.
  • the excited to vibrate roller is designed as a heating roller, the caused by the vibrations smoothing effect is further enhanced.
  • the roller is designed as a bending compensation roller.
  • the deflection of the roll is adjustable.
  • a uniform pressure on the material web can be generated over the length of the nip, so they are loaded with a uniform line load. This also ensures that the effects of the vibrations across the width of the web are uniform.
  • the roller arrangement has at least one measuring device with which roller vibrations can be detected.
  • individual vibrations of the roller or the counter-pressure element can be detected, or even vibrations of the entire roller assembly.
  • the oscillatory motion, but also the phase position of the vibrations can be measured for example by eddy current technology, laser technology or with accelerometers.
  • the roller assembly comprises a control device having a frequency converter.
  • the processing of the measurement signals and the control of the rotational vibration generator is carried out in a component, the control device.
  • the measurement of the roll vibrations then serves to control the torque that is used to generate the vibrations. Thereby, the oscillating movement of the roller can be optimally adjusted, so that the highest possible smoothness is generated.
  • the amplitude and phase position of the periodic torque can preferably be regulated as a function of the roll vibrations.
  • Predetermined, for example, calculated roller vibrations can thus be generated by driving the rotational vibration generator. This ensures that an optimal smoothing result is achieved.
  • the object is achieved in a method of the type mentioned in the present invention that at least one roller is placed in rotational vibrations at a frequency of 150 to 3000 Hz, in particular from 200 to 2000 Hz.
  • the rotational vibrations superimpose the normal rotational movement of the roller and are introduced for example by a periodic torque.
  • a frequency of less than 3000 Hz is significantly lower than the frequency of ultrasonic vibrations, which is in the range> 18 kHz.
  • the peripheral speed of the roller oscillates about a nominal value, which causes a periodically repeating differential speed between the roller and the counter-pressure element or the material web guided through the nip. This leads to a slip between the roller and the surface of the material web. There may also be shear between the upper surface and the lower surface of the web.
  • a torque motor exerts a periodic torque on a roller shell of the roller.
  • Torque motors generate high torque and can be controlled very precisely via the drive frequency.
  • the rotor of the torque motor for example, can be mounted directly on the roll shell, so that the periodic moment, which leads to the generation of the rotational vibrations, can be introduced directly into the roll. Losses, which are caused for example by transmission, are thus avoided. In this case, the additional space requirement is kept low.
  • the vibrations are introduced into the roll with a main drive of the roll arrangement.
  • the roller is usually provided with a main drive which drives the roller at the desired speed of rotation.
  • the vibrations are also introduced via the main drive in the roller, which is realized by a periodically changing moment, can be dispensed with an additional drive.
  • the main drive can be designed as a torque motor.
  • the roll vibrations are measured and processed in a control device.
  • conventional measuring devices such as accelerometers, can be used.
  • the phase position and amplitude of the vibrations should be detected and regulated, it being conceivable to take into account the vibrations of the roller and / or the vibrations of the roller assembly.
  • the amplitude and phase position of the periodic torque are preferably regulated as a function of the roll vibrations.
  • the periodic torque is introduced by the main drive or by the additional torque motor in the roller.
  • the control of the amplitude and phase position, the generated roll vibration can be adjusted to predetermined, for example calculated, roll vibrations. This ensures that an optimal smoothing result is achieved.
  • Fig. 1 is a roller assembly 1 with a roller 2 and a counter-pressure element 3, which is also designed as a roller shown.
  • the roller 2 and the counter-pressure element 3 form a nip 4, through which a material web 5 is guided.
  • the direction of movement of the material web 5 is indicated by an arrow 6.
  • the roller 2 has at its end faces on two pins 7, 8, with which it is held in bearing blocks 9, 10.
  • a main drive 11 which is designed as a torque motor.
  • the pin 8 is connected to a rotational vibration generator 12, which is also designed as a torque motor.
  • the main drive 11 generates a uniform rotational movement of the roller 2, whose Direction is indicated by the arrow 13.
  • the peripheral speed of the roller 2 corresponds to the web speed of the material web.
  • the rotational vibration generator 12 impresses a rotational vibration in the roller 2 whose direction is indicated by the arrows 14. In this case, the rotational vibration generator 12 generates a periodic, alternating additional torque.
  • the counter-pressure element 3 has two pins 15, 16 with which it is rotatably mounted in bearing blocks 17, 18.
  • the counter-pressure element 3 is usually also driven. A drive for the counter-pressure element 3 is not shown for reasons of clarity.
  • Fig. 2 is opposite Fig. 1 slightly modified embodiment illustrated. The same parts are provided with the same reference numerals.
  • Fig. 1 is in the embodiment according to Fig. 2 the main drive 11 and the rotational vibration generator 12 between the roller 2 and the corresponding bearing block 9, 10 are arranged.
  • the direction of movement of the counter-pressure element is characterized by an arrow 19. It corresponds to the embodiment in as well as the directions of movement of the other elements Fig. 1 ,
  • the material web 5 is guided through the nip 4 between the roller 2 and the counter-pressure element 3.
  • the counter-pressure element 3 is operated at a speed which corresponds to the web running speed of the material web 5.
  • the main drive 11 also ensures a speed of the roller 2, which corresponds to the speed of the material web 5 and therefore also the speed of the counter-pressure element 3.
  • a periodically changing torque is now introduced into the roller 2 via the rotational vibration generator 12, which is designed as a torque motor, thereby exciting the roller to oscillate. This is done with a frequency between 150 and 3000 Hz, with a frequency between 200 and 2000 Hz being preferred.
  • a vibration having a frequency of 1000 Hz is impressed in the roller 2.
  • the vibrations of the roller are expressed in a continuous, periodic change in the rotational speed of the roller and thus in a variable differential speed between the roller and the material web.
  • vibrations can be additionally introduced into the counter-pressure element 3 or a roller arrangement with a plurality of elements can be used.
  • the material web is a paper web in these embodiments.
  • the smoothness result of a surface can be improved with the aid of the roller arrangement according to the invention.
  • the vibrations of the roller 2 can be detected by a measuring device, e.g. is designed as an acceleration sensor and is fixed inside the roller 2. Such a measuring device is not shown in the figures.
  • the signals of the measuring devices can be processed in a control device, also not shown, the corresponding control signals generated for the rotational vibration generator 12.
  • the control device has a frequency converter.

Landscapes

  • Paper (AREA)
  • Rolls And Other Rotary Bodies (AREA)
  • Treatment Of Fiber Materials (AREA)
EP08162400A 2007-09-04 2008-08-14 Agencement de cylindres Withdrawn EP2034092A3 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE200710041931 DE102007041931A1 (de) 2007-09-04 2007-09-04 Walzenanordnung

Publications (2)

Publication Number Publication Date
EP2034092A2 true EP2034092A2 (fr) 2009-03-11
EP2034092A3 EP2034092A3 (fr) 2011-09-21

Family

ID=40091823

Family Applications (1)

Application Number Title Priority Date Filing Date
EP08162400A Withdrawn EP2034092A3 (fr) 2007-09-04 2008-08-14 Agencement de cylindres

Country Status (2)

Country Link
EP (1) EP2034092A3 (fr)
DE (1) DE102007041931A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2128337A1 (fr) 2008-05-31 2009-12-02 Voith Patent GmbH Procédé de fonctionnement d'une calandre et calandre
CN113334524A (zh) * 2021-06-17 2021-09-03 安徽科林新材料科技有限公司 一种阻燃刨花板全自动预压装置

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20110126686A1 (en) 2009-11-30 2011-06-02 Manfred Geiss Machine tool, machine tool apparatus and method for operating a machine tool apparatus
CN103824113A (zh) * 2014-01-09 2014-05-28 广东工业大学 一种基于图像识别技术的纸质印刷品数目的识别装置及其识别方法
CN108000921A (zh) * 2017-12-15 2018-05-08 济源市华中冶金机械有限公司 一种挤压机用挤压筒的调节设备
DE102019118109A1 (de) * 2019-07-04 2021-01-07 Bayerische Motoren Werke Aktiengesellschaft Verfahren zum Herstellen einer Elektrode

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3908808A (en) 1973-09-17 1975-09-30 Nakajima All Co Ltd Ultrasonic calendering of paper webs

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102005022874A1 (de) * 2005-05-18 2006-11-23 Voith Patent Gmbh Verfahren zur Schwingungsreduzierung in Papiermaschinen
DE102006031022A1 (de) * 2006-07-05 2008-01-10 Voith Patent Gmbh Schwingungsdämpfung

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3908808A (en) 1973-09-17 1975-09-30 Nakajima All Co Ltd Ultrasonic calendering of paper webs

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2128337A1 (fr) 2008-05-31 2009-12-02 Voith Patent GmbH Procédé de fonctionnement d'une calandre et calandre
CN113334524A (zh) * 2021-06-17 2021-09-03 安徽科林新材料科技有限公司 一种阻燃刨花板全自动预压装置

Also Published As

Publication number Publication date
DE102007041931A1 (de) 2009-03-05
EP2034092A3 (fr) 2011-09-21

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