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WO2003031297A1 - Procede et equipements de mesure d'un differentiel de vitesse angulaire - Google Patents

Procede et equipements de mesure d'un differentiel de vitesse angulaire Download PDF

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Publication number
WO2003031297A1
WO2003031297A1 PCT/FI2002/000782 FI0200782W WO03031297A1 WO 2003031297 A1 WO2003031297 A1 WO 2003031297A1 FI 0200782 W FI0200782 W FI 0200782W WO 03031297 A1 WO03031297 A1 WO 03031297A1
Authority
WO
WIPO (PCT)
Prior art keywords
rotating member
pulse
pulse sensor
measuring equipment
fit
Prior art date
Application number
PCT/FI2002/000782
Other languages
English (en)
Inventor
Pasi Tynninen
Pertti Arjanne
Original Assignee
Metso Paper, Inc.
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 Metso Paper, Inc. filed Critical Metso Paper, Inc.
Priority to AT0920802A priority Critical patent/AT501517B1/de
Priority to DE10297172T priority patent/DE10297172T5/de
Publication of WO2003031297A1 publication Critical patent/WO2003031297A1/fr

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H18/00—Winding webs
    • B65H18/08—Web-winding mechanisms
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H23/00—Registering, tensioning, smoothing or guiding webs
    • B65H23/04—Registering, tensioning, smoothing or guiding webs longitudinally
    • B65H23/044—Sensing web tension
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H23/00—Registering, tensioning, smoothing or guiding webs
    • B65H23/04—Registering, tensioning, smoothing or guiding webs longitudinally
    • B65H23/18—Registering, tensioning, smoothing or guiding webs longitudinally by controlling or regulating the web-advancing mechanism, e.g. mechanism acting on the running web
    • B65H23/195—Registering, tensioning, smoothing or guiding webs longitudinally by controlling or regulating the web-advancing mechanism, e.g. mechanism acting on the running web in winding mechanisms or in connection with winding operations
    • B65H23/1955—Registering, tensioning, smoothing or guiding webs longitudinally by controlling or regulating the web-advancing mechanism, e.g. mechanism acting on the running web in winding mechanisms or in connection with winding operations and controlling web tension
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H2220/00—Function indicators
    • B65H2220/09—Function indicators indicating that several of an entity are present
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H2301/00—Handling processes for sheets or webs
    • B65H2301/40—Type of handling process
    • B65H2301/41—Winding, unwinding
    • B65H2301/414—Winding
    • B65H2301/4148—Winding slitting
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H2513/00—Dynamic entities; Timing aspects
    • B65H2513/10—Speed
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H2513/00—Dynamic entities; Timing aspects
    • B65H2513/10—Speed
    • B65H2513/11—Speed angular
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H2515/00—Physical entities not provided for in groups B65H2511/00 or B65H2513/00
    • B65H2515/30—Forces; Stresses
    • B65H2515/31—Tensile forces
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H2553/00—Sensing or detecting means
    • B65H2553/51—Encoders, e.g. linear
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H2557/00—Means for control not provided for in groups B65H2551/00 - B65H2555/00
    • B65H2557/30—Control systems architecture or components, e.g. electronic or pneumatic modules; Details thereof
    • B65H2557/33—Control systems architecture or components, e.g. electronic or pneumatic modules; Details thereof for digital control, e.g. for generating, counting or comparing pulses

Definitions

  • the invention relates to a method according to the preamble of claim 1 for measuring the mutual rotating movement of rotating members used in the treatment of a moving web, especially in the treatment of a paper web.
  • the invention also relates to measuring equipment implementing the method according to the preamble of claim 15.
  • High web speeds of present papermaking and finishing processes set extremely high demands for control systems by means of which the movement of the paper web is controlled on a path formed of drums, cylinders, rolls and other corresponding rotating members.
  • the con- trol system requires specific measurement information on the rotating speeds of the members that are in contact with the paper web. In many cases it is significant to know especially the accurate mutual difference between the angular speeds of the rotating members as well as their peripheral speeds, which speed difference affects the forces exerted on the paper web by said members.
  • Precise control of the rotating speeds is especially important in the reeling up process of a paper web.
  • a continuous paper web of several meters in width which is passed directly from a paper machine or from a finishing treatment apparatus connected thereto in a continuous, on-line type manner, or from a separate off-line type finishing treatment apparatus, is reeled to form successive machine reels around reeling cores, so-called reel spools.
  • These large machine reels which substantially comply with the width of production of paper, function as some kind of intermediate storages for the paper web between off-line type finishing processes.
  • Successful reeling up process is essential to maintain the quality of the paper web stored on the machine reels as high as possible for further processing.
  • reel-up solutions of which a reel-up type generally used at present in the reeling up of large-sized, large-mass machine reels is a so-called centre drive assisted reel-up.
  • the afore- mentioned reel-up type utilizes either a stationary or moving reeling cylinder equipped with a centre drive and a growing machine reel, which is in a so-called nip contact with said reeling cylinder in the reeling station.
  • the paper web is guided on the machine reel via a nip formed between said reeling cylinder and the machine reel that is being formed.
  • the reel spool functioning as a reeling core for the machine reel is provided with a separate centre drive of its own in addition to the fact that the aforementioned reeling cylinder is rotated with a centre drive.
  • control variables which are, for example the web tension of the paper web determined before the nip and the reeling cylinder, the nip force of the reeling nip (linear load) and the peripheral force exerted on the paper web by the centre drive of the machine reel.
  • the change in the mass can be calculated when the width and grammage of the paper web as well as the speed of the web reeled on the machine reel are known.
  • the speed of the web is attained in a known manner for example by measuring the speed of rotation of the reeling cylinder having a standard diameter.
  • the width of the web can be considered constant and known.
  • One method that is known as such and disclosed for example in the aforementioned patent application WO/9337567 of the applicant for determining the volume of a machine reel is based on the accurate determination of the speed of rotation of the machine reel when the speed of the paper web entering on the machine reel is known. This method is based on the fact that when the diameter and radius of the machine reel grows, the length of the periphery of the machine reel also changes, which change can be detected as a slow deceleration of the speed of rotation of the machine reel.
  • One known method for determining the mutual difference in the speed of the rotating members is based on the comparison of the number of pulses of pulse sensors installed on the rotating shafts of said members in the above-described manner.
  • the measurement of the difference in the speed of rotation of the machine reel and the reeling cylinder is by way of example described in a manner that is dis- closed for example in the article "Measurement of Paper Roll Density during Winding", L.G. Eriksson, C. Lydig, J.A. Viglund, TAPPI Journal, January 1983, pp. 63-66.
  • the reeling cylinder is equipped with a first high resolution pulse sen- sor, said first pulse sensor producing for example 5000 pulses per each full revolution of the reeling cylinder.
  • the machine reel that is being formed is equipped with a second pulse sensor, said second pulse sensor producing for example one pulse per each full revolution of the machine reel.
  • the pulses obtained from said first pulse sensor during the time between two successive pulses of said second pulse sensor illustrate the length of the periphery of the machine reel that is being formed in relation to the known peripheral length of the reeling cylinder, wherein the measurement can be utilized for determining the radius/diameter of the machine reel, and thereby for determining the volume as well.
  • This information can be utilized further in a known manner to determine the density of the machine reel, and to adjust the reeling up process thereby.
  • the accuracy of the measurement utilizing pulse sensors in the above- described known manner is, however, always restricted by the number of pulses produced by said second sensor per one revolution, said number of pulses being typically in the order of 5000 pulses/revolution in sensor types suitable for industrial conditions. Because it is not possible to limitlessly increase the number of pulses, i.e. the resolution of the pulse sensors, attempts have been made to avoid this problem by increasing the measurement time, i.e. calculating the number of pulses given by the pulse sensor per several revolutions of the machine reel, thus calculating an average value for the measurement result over several revolutions to improve the measurement accuracy. This of course results in that the real-time quality of the adjustment system utilizing the measurement result suffers, because the measurement result is thus obtained after a delay.
  • the main purpose of the present invention is to produce a new method for measuring the mutual rotating movement of rotating members, by means of which method it is possible to obtain a significantly better measurement accuracy when compared to the above-described solution according to the state of the art, and that in contrast to the state of the art the accuracy of said method is not restricted by the maximum number of pulses produced by the pulse sensors per revolution. Furthermore, it is an aim of the invention to provide simple measuring equipment that implements the method and is easy to use.
  • the measuring method according to the invention is primarily characterized in what will be presented in the characterizing part of the independent claim 1.
  • the measuring equipment according to the invention is pri- marily characterized in what will be presented in the characterizing part of the independent claim 15.
  • the basic idea of the invention is the insight that the accuracy of the measurement can be significantly improved by shifting from the calculation of the number of pulses to determination of the accurate event time of the pulses.
  • the improved measuring accu- racy is not at all based on increasing the number of pulses given by the pulse sensors per one revolution, but good measurement accuracy can now be achieved by means of sensors producing only one pulse per revolution.
  • the first rotating member that is under examination is equipped with a first pulse sensor to produce pulses in proportion to the angular position of said first rotating member and the second rotating member is in a corresponding manner equipped with a second pulse sensor to produce pulses in proportion to the angular po- sition of said second rotating member.
  • the aforementioned pulse sensors can produce one or more pulses per each full revolution of the member that is being measured.
  • the specific event times of the pulses produced by the first and the second pulse sensor are registered and they are compared with each other at intervals of one full revolution of the first rotating member used as a reference in a manner described hereinbelow.
  • a fit and interpolation parameters are determined for each last measured pulse of the pulse sequence produced by the first pulse sensor over one or more successive intervals preceding said last pulse, said intervals being formed between those successive pulses registered by the first pulse sensor that correspond to the same angular position in the successive revolutions of the first rotating member.
  • Said fit and interpolation parameters further enable an accurate determination of the angular position of the first rotating member at any moment of time within said interval/intervals.
  • a position is now determined by means of the fit and the interpolation parameters for each pulse of the second pulse sensor that is detected during the interval last determined for the first rotating member, said position indicating the angular value of the first rotating member functioning as a reference during the event time of said pulse.
  • the first and second pulse sensor installed in connection with the first and second rotating mem- ber both produce one pulse per each revolution of the member that is being measured.
  • the invention is not, however, restricted solely to said embodiment, but in connection with both rotating members it is possible to install pulse sensors producing one or more pulses per revolution.
  • a fit and interpolation parameters are separately determined for each pulse corresponding to a different angular position and being produced by the first pulse sensor functioning as a reference for each revolution, and each pulse produced by the second pulse sensor per one revolution, and corresponding to the different angular position is separately compared with each aforementioned fit.
  • n x m values are attained for the angular speed difference, in which n is the number of pulses produced by the first pulse sensor per one full revolution of the first rotating member, and m correspondingly the number of pulses produced by the second pulse sensor per one full revolution of the second rotating member.
  • n is the number of pulses produced by the first pulse sensor per one full revolution of the first rotating member
  • m correspondingly the number of pulses produced by the second pulse sensor per one full revolution of the second rotating member.
  • the measuring method is applied for measurement of the rotating speed of the machine reel formed in the reeling up process in relation to the speed of the reeling cylinder, i.e. for the measurement of the angular speed difference of said members.
  • This makes it possible to determine the length of the periphery of the machine reel in relation to the length of the periphery of the reeling cylinder, and thereby to determine the change in the radius and volume of the machine reel as a function of time.
  • This information can be utilized to determine the density of the machine reel, and to adjust the reeling up process by means of the density information.
  • the most important advantages of the invention when compared to solutions of related art include significant improvement of the measure- ment accuracy as well as production of accurate measurement results with a slight delay, which improves the usability of the measurement result in real-time adjustment. Furthermore, the invention enables a wide freedom of choice in the selection of the type of pulse sensors necessary in the measurement, because the maximum number of pulses received per one revolution is not significant in view of the accuracy. Moreover, the measurement device implementing the method according to the invention has a simple structure and can be easily in- stalled. The measurement device is suitable to be used either as a fixed installation, or it can also be utilized in mobile maintenance and test use.
  • Fig. 1 shows, in principle, a mutual arrangement of a machine reel and a reeling cylinder in reeling up
  • Fig. 2 illustrates the state of the art use of pulse sensors to determine the angular speed difference of a machine reel and a reeling cylinder
  • Fig. 3 illustrates an embodiment of the invention to determine the angular speed difference of a machine reel and a reeling cylinder
  • Fig. 4 illustrates an embodiment of the invention that utilizes linear fit
  • Fig. 5 illustrates an embodiment of the invention that utilizes second order polynomial fit
  • Fig. 6 illustrates a placement of the trigger means of pulse sensors according to the invention in the first and the second rotating member
  • Fig. 7 illustrates another placement of the trigger means of the pulse sensors according to the invention in the first and the second rotating member
  • Fig. 8 illustrates a preferred embodiment of the measuring equipment according to the invention when applied in the adjustment of the reeling up process.
  • Figs 1 and 2 illustrate in principle a mutual arrangement of the machine reel R and the reeling cylinder D in a reeling up process, as well as the state of the art use of pulse sensors S1 , S2 to determine the angular speed difference of the reeling cylinder D and the machine reel R.
  • the reeling cylinder D rotates at a peripheral speed corresponding to the speed of the paper web W, and it is mounted on bearings in the frame of the reel-up or to a stable or moving structure attached to the frame by means of shafts located at the ends.
  • the reeling cylinder D is coupled to a centre drive device M1 via the other end of said cylinder, which centre drive device, in turn, is connected to the drive of another apparatus that feeds the paper web W, in such a manner that the peripheral speed of the reeling cylinder D can be adjusted to correspond to the speed of the web W fed to the reel-up.
  • the centre drive M1 of the reeling cylinder D it is, according to related art, possible to use a tension measurement member before the reeling cylinder D in the travel direction of the paper web W, to measure the tension of the paper web W.
  • the paper web W is accumulated on a reeling core T to form a machine reel R, and the machine reel R is loaded at the same time in a known manner against the reeling cylinder D to form a so-called nip and to attain a desired nip force.
  • a separate centre drive M2 is connected via the other end of the roll. By adjusting the torque of said centre drive M2 it is possible to affect the peripheral force exerted on the paper web W that is being reeled up in a known manner.
  • the adjustment system controlling the reeling up process requires information on the speeds of rotation of the reeling cylinder D and accurate information especially on the mutual difference in the rotating/angular speeds of said members to determine the density of the machine reel R.
  • the reeling cylinder D is according to the state of the art equipped with a first pulse sensor S1 , said first pulse sensor producing for example 5000 pulses per each full revolution of the reeling cylinder D.
  • the machine reel R (reel spool T), in turn, is equipped with a second pulse sensor S2, said second pulse sensor S2 producing one pulse per each full revolution of the machine reel R.
  • the absolute measurement accuracy of the reeling cylinder D and the machine reel R can be improved only by increasing the number of pulses given by the first pulse sensor S1 per one revolution of the reeling cylinder D, and/or by calculating the measurement result over several revolutions of the machine reel R (intervals n ⁇ , n i+1 , etc.).
  • the latter method significantly weakens the real-time quality of the measurement result.
  • Fig. 3 shows in principle one embodiment of the method according to the invention for determining the angular speed difference between the machine reel R and the reeling cylinder D.
  • the reeling cylinder D is equipped with a first pulse sensor S1 , said first pulse sensor S1 producing now only one pulse per each revolution of the reeling cylinder D functioning as a reference.
  • the machine reel R is equipped with a second pulse sensor S2, said second pulse sensor S2 producing one pulse per each full revolution of the machine reel R.
  • the accurate event times of the pulses produced by the first S1 and the second pulse sensor S2 are registered for example in the accuracy of approximately 1 ⁇ s.
  • the pulses produced by the pulse sensor S1 are shown in a system of coordinates in which the horizontal axis shows in radians the time t and the y-axis shows the angular position of the reeling cylinder D functioning as a reference.
  • the moments in time corresponding to the pulses of the first pulse sensor S1 given at intervals of one full revolution of the reeling cylinder D are in Fig. 3 shown with t n , t n +1 , t n+2 , etc.
  • the event times of said pulses are marked with spherical symbols in the system of coordinates of Fig. 3.
  • a fit F and interpolation parameters corresponding to the fit F are now determined for each pulse given by the first pulse sensor S1 over one or more successive intervals preceding said pulse, said intervals being formed between these successive pulses registered by the first pulse sensor S1 that correspond to the same angular position of the reeling cylinder in the successive revolutions of the reeling cylinder D.
  • Fig. 3 shows an interval i n+5 preceding the pulse occurring at a moment of time t n+5 , said interval being in this case formed between the successive- sive pulses t n+4 and t n+5 of the first pulse sensor S1.
  • an interval i n+4 etc. is formed between the pulses t n+3 and t n+4 .
  • the fit F and the interpolation parameters further make it possible to determine the accurate angular position of the first rotating member, i.e. the reeling cylinder D at any time within said interval/intervals.
  • the fit F is shown in such a manner that it extends over all the pulses of the pulse sensor S1 shown in the drawing and the intervals therebetween, but in practise the fit F is produced according to the invention over one or more successive last produced intervals always when the first pulse sensor S1 gives a new pulse.
  • the fit F is produced and the interpolation parameters related thereto are determined for a continuous process of predetermined duration extending on an area of specific length of one or more intervals, wherein said fit F of predetermined length "proceeds" in time in the pulse se- quence S1 always when a new pulse arrives.
  • the most important advantages of the present invention include a significant improvement in the measurement accuracy when compared to solutions according to the state of art.
  • a resolution of 100000/revolution is attained when using a rather moderate time metering resolution of 1 ⁇ s.
  • the accuracy of the method according to the invention naturally de- pends on the accuracy of the method used in the interpolation i.e. in the production of the fit F, but in practice the interpolation can be easily implemented in such a manner that it does not restrict the measurement accuracy attained by means of the method, but the measurement accuracy is primarily determined on the basis of the accuracy of the measurement of time.
  • Figs 4 and 5 further illustrate the formation of the fit F in different ways over the two last produced intervals.
  • the speed of rotation of the first rotating member D functioning as a reference is presented in such a manner that it decelerates exaggeratedly in the aforementioned drawings.
  • Figs 4 and 5 show a curve F' by means of a broken line, said curve illustrating the "real" change in the angular position as a function of time in the situation to be examined.
  • the fit F is formed as a linear fit over the two intervals preceding the pulse given by the pulse sensor S1 at a moment of time t n+5 .
  • the linear fit is preferably suitable to be used in a situation in which the rotating speed of the first rotating member D, such as a reeling cylinder that is under examination slowly changes and/or it is only necessary to produce a fit F over one interval.
  • the fit F is formed as a second order polynomial fit over the two intervals preceding the pulse given by the pulse sensor S1 at a moment of time t n+5 .
  • the graph of the second order polynomial fit F is a parabola which, in faster changes in the speed of rotation of the rotating member D can be adjusted to comply with the pulses of the first pulse sensor S1 better than a linear fit.
  • the adjustment and the determination of the interpolation parameters is advantageously con- ducted over two or more intervals in such a manner that the fit F is forced to travel via the pulse sensor time - angular position coordinates that form the outermost measurement points.
  • the second order polynomial fit F is formed in such a manner that the curve illustrating the fit F travels via the points measured at moments of time t n+3 and t n+5 .
  • this reduces the inaccuracy caused by the fit F.
  • the measurement accuracy is also improved, because this effect substantially corresponds to the act of calculating an average value for the measurement over several revolutions of the rotating member.
  • the invention is not, of course, restricted solely to the use of a linear fit or a second order polynomial fit. If necessary, it is also possible to use a multiple order polynomial fit or another fit, which fit F can be formed over one or several successive intervals.
  • the invention is still not restricted solely to such embodiments in which pulse sensors producing only one pulse per revolution are installed in connection with the first and the second rotating member, such as a reeling cylinder D and a machine reel R.
  • Figs 6 and 7 illustrate some embodiments of the invention in which pulse sensors producing several pulses per revolution are installed in connection with the first D and/or the second R rotating member.
  • Fig. 6 illustrates such an embodiment of the invention in which a second pulse sensor S2 producing two pulses per revolution is in- stalled in connection with the second rotating member R, and a first pulse sensor S1 producing one pulse per revolution is, in turn, installed in connection with the first rotating member D.
  • the marks R ⁇ R illustrate the positioning of the pulses produced by the second pulse sensor S2 in different angular positions with respect to each other in the second rotating member R.
  • said trigger means can be adhesive reflective tapes or the like that are attached to the rotating member R.
  • a fit F is determined for the pulse sequence corresponding to the mark D ⁇ in the first pulse sensor S1 functioning as a reference.
  • Each pulse produced by the second pulse sensor S2 per one revolution of the second rotating member R (and corresponding to a different angular position) is compared separately with the aforementioned fit.
  • the marks ⁇ and R 2 form in this respect two different pulse sequences, both said pulse sequences being compared separately with the fit F.
  • Fig. 7 illustrates such an embodiment of the invention in a manner corresponding to Fig. 6 in which the first pulse sensor S1 installed in connection with the first rotating member D produces two pulses per revolution. Now a separate fit F is produced for each pulse sequence corresponding to marks D and D 2 . Each pulse sequence corresponding to the different marks Ri, R 2 and R 3 of the second pulse sensor S2 measuring the rotation of the second rotating member is compared separately with both fits F. In the situation of Fig. 7 it is thus possible to update six different values for the angular speed difference of the pre- determined distance revolved by the rotating member D functioning as a reference, of which values it is possible to calculate an average value.
  • the measurement system requires information input by the user regarding the number of the marks, because now the number of the marks cannot be determined on the basis of the pulse sequence produced by the pulse sensor S2.
  • Fig. 8 shows in principle a preferred embodiment of the measurement apparatus implementing the method according to the invention when applied in connection with the reeling up of a paper web W.
  • the measuring equipment of Fig. 8 comprises a first S1 and a second S2 pulse sensor arranged in connection with the machine reel R and the reeling cylinder D.
  • the accurate event times of the pulses produced by said pulse sensors are registered in a data processor CPU, which data processor CPU is arranged to communicate with the control system controlling the reeling up process.
  • the data processor CPU can be for example a computer that is encapsulated in a manner corresponding to the surrounding conditions and equipped with an AD converter card or the like to register the even times of the pulses of the pulse sensors, as well as with a suitable software to perform calculation.
  • a PC computer can be coupled in known manners to communicate with the control systems of the rest of the equipment. It is, of course, obvious for anyone skilled in the art that the data processor CPU can also be contained in the actual adjustment and control system controlling the rotating members that are under examination, wherein a separate computer or the like is not necessary for the measurement according to the invention.
  • the data processor CPU is arranged to determine the angular speed difference between the machine reel R and the reeling cylinder D by means of the method according to the invention.
  • the reeling cylinder R is used as a reference, and after each pulse coming from the first pulse sensor S1 , the data processor CPU calculates a fit F and interpolation parameters over the last measured one or more intervals of the pulse sequence of the pulse sensor S1.
  • the position and progression of the reeling cylinder D are calculated as an angular value of a preceding position registered in a similar manner on the basis of the pulse of the second pulse sensor S2 occurring during said last interval.
  • the aforementioned progression now indicates the relative speed of the reeling cylinder D in relation to the machine reel R and at the same time the relative diameter of the machine reel R in relation to the diameter of the reeling cylinder D.
  • the change in the diameter of the machine reel R as a function of time gives information on the change in the volume of the machine reel R. This information can be utilized further in a known manner to determine the density of the machine reel, and to adjust the reeling up process thereby.
  • the invention enables a wide freedom of choice in the selection of the type of the pulse sensors S1 , S2 necessary in the measurement. Because the maximum number of pulses obtained per one revolution is not significant in the method according to the invention, it is possible to utilize for example optical, inductive, capacitive, magnetic or any other kind of solution known as such by anyone skilled in the art for the implementation of the pulse sensors installed in the rotating members.
  • trigger means such as adhesive reflective tapes or the like that move along with the rotating movement, said tapes producing a pulse to be measured when passing by a stationary indicator part.
  • trigger means such as adhesive reflective tapes or the like that move along with the rotating movement, said tapes producing a pulse to be measured when passing by a stationary indicator part.
  • optical sensors of the above kind is advantageous especially in test and maintenance use.
  • magnetic sensors whose performance is not weakened because of dirt, and which are also otherwise insensitive to external (electric) disturbances.
  • the pulses of the pulse sensors that are being used do not necessarily have to be formed of temporally short pulses that are separate from each other, as shown for example in the lower part of claim 3.
  • a clear change occurs in the signal of the pulse sensor, for example the signal changes from the stepped value "0" to the value "1", said values corresponding to predetermined voltage levels or voltage areas.
  • edge sensitive indication in a known manner.
  • a pulse sensor producing one "pulse” per one revolution of the rotating member that is under examination can thus give a signal with the value "1" during a predetermined revolution, said signal changing into the value "0” for the duration of the next revolution when passing by the trigger means, and back to the value "1" the next time when passing by the trigger means, etc.
  • the invention is in the examples above described in connection with reeling up in particular, it is obvious for anyone skilled in the art, that the invention can also be applied for example in unwinding, calendering or other rotating members that guide and/or treat the paper web in its path.
  • calendering the invention can be used for example to determine the mutual speed of opposite calender rolls.
  • the invention can also be applied in reel-ups based on king rolls, as well as in king roll slitters or other slitter winders that form customer rolls.

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  • Length Measuring Devices With Unspecified Measuring Means (AREA)

Abstract

L'invention porte sur un procédé et des équipements de mesure du mouvement mutuel de rotation d'un premier élément (D) et d'un deuxième élément (R) tournants, utilisés dans le traitement d'une bande en mouvement (W), et en particulier d'une bande de papier, et selon lesquels un premier capteur d'impulsions (S1) produit des impulsions en proportion de la rotation du premier élément (D) et un deuxième capteur d'impulsions (S2) produit des impulsions en proportion de la rotation du deuxième élément (R). Les instant de production des impulsions par le premier capteur (D) et par le deuxième capteur (R) sont enregistrés avec précision, et on utilise la correspondance (F) de la séquence d'impulsions produites par le premier capteur (S1) pour déterminer la position (p') de chaque impulsion du deuxième capteur (S2), cette position (p') indiquant la position angulaire précise de l'élément (D) à l'instant de production d'une impulsion par le deuxième capteur (S2). La progression (d', d') de la position angulaire de l'élément (R) par rapport au mouvement du premier élément (D) se détermine à l'aide des positions (p', p', p''') déterminées pour les révolutions successives du deuxième élément (R). L'invention permet une détermination plus précise du différentiel de vitesses de rotation.
PCT/FI2002/000782 2001-10-08 2002-10-07 Procede et equipements de mesure d'un differentiel de vitesse angulaire WO2003031297A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
AT0920802A AT501517B1 (de) 2001-10-08 2002-10-07 Verfahren und messausrüstung zur bestimmung der winkelgeschwindigkeitsdifferenz
DE10297172T DE10297172T5 (de) 2001-10-08 2002-10-07 Verfahren und Messausrüstung zur Bestimmung der Winkelgeschwindigkeitsdifferenz

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FI20011959 2001-10-08
FI20011959A FI110548B (fi) 2001-10-08 2001-10-08 Menetelmä ja mittauslaitteisto kulmanopeuseron määrittämiseksi

Publications (1)

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WO2003031297A1 true WO2003031297A1 (fr) 2003-04-17

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PCT/FI2002/000782 WO2003031297A1 (fr) 2001-10-08 2002-10-07 Procede et equipements de mesure d'un differentiel de vitesse angulaire

Country Status (4)

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AT (1) AT501517B1 (fr)
DE (1) DE10297172T5 (fr)
FI (1) FI110548B (fr)
WO (1) WO2003031297A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102249109A (zh) * 2011-01-13 2011-11-23 昆山市宝立无纺布有限公司 布料张力控制装置
WO2013168026A1 (fr) * 2012-05-08 2013-11-14 Kimberly-Clark Worldwide, Inc. Organe de commande et système permettant d'entraîner en rotation un rouleau de matériau de manière apte à être commandée

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104477681B (zh) * 2014-11-27 2017-02-22 惠安县科联农业科技有限公司 一种恒定线速度卷纸机
CN109761080B (zh) * 2018-12-31 2024-04-19 天津市旭辉恒远塑料包装股份有限公司 防散压辊

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4496112A (en) * 1982-04-01 1985-01-29 Asea Aktiebolag Method of controlling a web winding process
US4535950A (en) * 1984-01-13 1985-08-20 International Paper Company Method and apparatus for roll winding measurement
EP0397594A2 (fr) * 1989-05-10 1990-11-14 Beloit Technologies, Inc. Dispositif pour régler la densité d'un rouleau
WO1999037567A1 (fr) * 1998-01-22 1999-07-29 Valmet Corporation Procede et appareil de commande de l'enroulage

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4496112A (en) * 1982-04-01 1985-01-29 Asea Aktiebolag Method of controlling a web winding process
US4535950A (en) * 1984-01-13 1985-08-20 International Paper Company Method and apparatus for roll winding measurement
EP0397594A2 (fr) * 1989-05-10 1990-11-14 Beloit Technologies, Inc. Dispositif pour régler la densité d'un rouleau
WO1999037567A1 (fr) * 1998-01-22 1999-07-29 Valmet Corporation Procede et appareil de commande de l'enroulage

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102249109A (zh) * 2011-01-13 2011-11-23 昆山市宝立无纺布有限公司 布料张力控制装置
WO2013168026A1 (fr) * 2012-05-08 2013-11-14 Kimberly-Clark Worldwide, Inc. Organe de commande et système permettant d'entraîner en rotation un rouleau de matériau de manière apte à être commandée
US9221641B2 (en) 2012-05-08 2015-12-29 Kimberly-Clark Worldwide, Inc. Controller and system for controllably rotating a roll of material

Also Published As

Publication number Publication date
DE10297172T5 (de) 2004-07-08
FI20011959A0 (fi) 2001-10-08
AT501517A1 (de) 2006-09-15
AT501517B1 (de) 2007-02-15
FI110548B (fi) 2003-02-14

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