EP0606615B1 - Procédé et appareil pour le contrÔle continu de la qualité dans le travail préparatoire à la filature - Google Patents

Procédé et appareil pour le contrÔle continu de la qualité dans le travail préparatoire à la filature Download PDF

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Publication number
EP0606615B1
EP0606615B1 EP93120469A EP93120469A EP0606615B1 EP 0606615 B1 EP0606615 B1 EP 0606615B1 EP 93120469 A EP93120469 A EP 93120469A EP 93120469 A EP93120469 A EP 93120469A EP 0606615 B1 EP0606615 B1 EP 0606615B1
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EP
European Patent Office
Prior art keywords
limit value
limit
value
sliver
machine
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.)
Expired - Lifetime
Application number
EP93120469A
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German (de)
English (en)
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EP0606615A1 (fr
Inventor
Peter Feller
Walter Grüebler
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.)
Zellweger Luwa AG
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Zellweger Luwa AG
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Publication of EP0606615A1 publication Critical patent/EP0606615A1/fr
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Classifications

    • D—TEXTILES; PAPER
    • D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
    • D01H—SPINNING OR TWISTING
    • D01H13/00—Other common constructional features, details or accessories
    • D01H13/14—Warning or safety devices, e.g. automatic fault detectors, stop motions ; Monitoring the entanglement of slivers in drafting arrangements
    • D01H13/22—Warning or safety devices, e.g. automatic fault detectors, stop motions ; Monitoring the entanglement of slivers in drafting arrangements responsive to presence of irregularities in running material
    • D—TEXTILES; PAPER
    • D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
    • D01G—PRELIMINARY TREATMENT OF FIBRES, e.g. FOR SPINNING
    • D01G23/00—Feeding fibres to machines; Conveying fibres between machines
    • D01G23/06—Arrangements in which a machine or apparatus is regulated in response to changes in the volume or weight of fibres fed, e.g. piano motions

Definitions

  • the present invention relates to a method for on-line quality monitoring in the spinning mill by detecting cross-sectional fluctuations in the strips produced and by deriving quality parameters from the measurement signal obtained, deviations of these quality parameters from selectable limit values being detected and one of the parameters mentioned being formed by the mass non-uniformity.
  • a method of this type is used, for example, in the USTER SLIVERDATA (USTER - registered trademark of Zellweger Uster AG) data system (see Prospelet from Zellweger Uster AG in CH-8610 Uster / Switzerland, Prospelet No. 240 833-16010 / 5.90 / 2000), which is used to monitor quality and production in the spinning mill. In addition to the mass non-uniformity, the band number and periodic and almost periodic mass fluctuations are checked as part of the quality monitoring.
  • the invention is intended to provide a method for on-line monitoring in the spinning mill, which enables the detection of short thick spots.
  • the measurement signals are compared with a first limit value for the deviations from the target weight of the monitored strip, which is formed as a product of the mass non-uniformity and a selectable limit value factor, and that any exceeding of the first limit value is interpreted as a thick point.
  • the method according to the invention enables the reliable detection of thick spots from a certain length and a certain cross section.
  • the length depends on the speed of the tape and the sampling frequency. In a typical embodiment, it is 4 cm. However, this does not mean that thick spots with a smaller length are not recorded; the acquisition is only no longer with 100% certainty.
  • the definition of the first limit value as a function of the mass non-uniformity has the advantage that the thick spots are not defined on the basis of their absolute cross-section but on the basis of the relative cross-sectional increase as a percentage of the nominal strip weight. In this way, exactly those thick spots are detected that cause a recognizable disturbance in the tissue, which is usually shading.
  • the invention further relates to a device for performing the above-mentioned method, with a sensor for scanning the strip cross-section and with an evaluation unit for processing the sensor signals, which has a first channel for determining the mass non-uniformity.
  • the device according to the invention is characterized in that the evaluation unit has a second channel for the analysis of the sensor signals for exceeding a first, adjustable limit value corresponding to an increase in cross-section of the strip, the size of which is also determined by the mass unevenness determined in the first channel.
  • a measuring element 1 shows the structure of a USTER SLIVERDATA system for production and quality monitoring in spinning preparation.
  • a measuring element 1 is arranged per delivery for the detection of cross-sectional fluctuations of the monitored sliver 2. Since the measuring element 1 does not form the subject of the present invention, it is not explained in more detail here; in this context reference is made to US-A-4 864 853, which describes a particularly advantageous measuring element for strip cross-section fluctuations.
  • the measuring signal of the measuring element 1 is connected to a processor 4 via a so-called machine station 3, a common processor 4 being provided for a group of several, up to 16 measuring elements 1.
  • the machine station 3 also has an input for signals from a production sensor (not shown) which are supplied via a line 5 and which is used to record the speed and the running and stopping times. This detection is carried out by monitoring the speed of a shaft rotating in proportion to the production speed, such as delivery cylinders or calenders.
  • the signals from the production sensor also reach the processor 4 via machine station 3, which calculates quality and production data from the measured values recorded on the individual deliveries, these with inputable limit values compares and controls the responsible machine station 3 when a limit value is exceeded, whereupon this triggers a corresponding action.
  • This action is either the activation of a warning lamp 6 in the case of smaller, still tolerable, or the emission of a stop signal which shuts off the machine via a line 7 in the event of major faults.
  • each machine station 1 also has stop connections 8 for the automatic detection of the cause of the standstill by the signals from the machine and a connection for a so-called numerical machine terminal 9.
  • the latter is an input and output station through which various codes can be entered and data can be called up.
  • the processor 4 is connected to a central processing unit 10, the main functions of which consist in periodically polling the processors, processing and storing the measured values and machine signals, controlling the dialog with the users and outputting data to higher-level systems.
  • Video and / or printer terminals (not shown) connected to the central unit 10 serve as dialogue stations.
  • warning limits are entered for each of the quality parameters mentioned, when they are exceeded the warning lamp 6 (FIG. 1) begins to flash on the corresponding delivery.
  • a stop factor greater than one is entered, with which it is determined from which deviation of the size of the warning limit times the stop factor the machine is stopped.
  • the coefficient of variation is averaged over the entire analysis length of the spectrogram.
  • the processor 4 determines the spectrograms of the individual deliveries in succession. This value is updated periodically, with the interval between the individual updates depending on the machine park and, for example, between 15 minutes and several hours.
  • production data are, for example, the number of hopes or can changes, actual efficiency, the quantity produced, theoretically possible production per hour at 100% efficiency, time per hope or change of can, number of machine downtimes, total stop time, measured delivery speed.
  • the machine station 3 processes the measuring signal MS of the measuring element 1 in three channels; In a first channel K1 the variation coefficient of the band number for short fluctuations in CV% is determined, in a second channel K2 the band number deviation from the target value in A% and in a third channel K3 the monitoring for short thick points DS.
  • This calculation of variation coefficient and band number deviation based on the previous configuration of a USTER SLIVERDATA system, in the processor 4 on the one hand and in the machine station 3 on the other hand is for the present one Invention not essential.
  • the two-fold calculation can be avoided by integrating the functions of the processor 4 into the machine station 3.
  • first channel K1 fluctuations in the tape number of approximately 4 cm cutting length are measured within 100 m tape pieces.
  • second channel K2 which, in contrast to channel K1, is a long-term channel, the tape number deviation from the target value is measured, the measuring device 1 (FIG. 1) calibrating to this target value each time the processed articles or materials and the tape number change becomes. The deviations of the tape number from the setpoint are integrated so that the temporal progression of the tape number is calculated and saved in channel K2.
  • the sliver 2 (FIG. 1) is monitored for short thick points DS, which are aperiodic increases in cross-section of a certain size.
  • the thick spots which can occur in large numbers, are caused by band accumulations, defective machine parts, poor maintenance and cleaning and incorrect machine settings. They cause production disruptions, which are very cost-intensive, and they also influence the quality of the end product and the efficiency of all process stages.
  • a thick point is defined as a specific cross-sectional increase compared to the target value, for example as a cross-sectional increase by at least 40%, and a limit value for the deviation from the target strip weight is defined.
  • This determination is made by forming the product from a factor K times the average non-uniformity CV% calculated in channel K1.
  • the factor K in turn depends on how many violations of the limit value per 100 m band should be permitted. K will therefore be greater, the fewer exceedances are permissible.
  • the nominal belt weight is not a static but a dynamic quantity.
  • the mean value of the strip weight over the last 100 m is calculated, thereby determining the operating point of the system. If this operating point, i.e. the mean value mentioned, deviates from the target strip weight, then the limit value is corrected accordingly.
  • a plurality of, for example, eight detection variants is defined, from which the user can select the one that seems most suitable to him. In this way, the user does not have to enter a plurality of numerical values, rather it is sufficient to enter the respective registration variant, for example by means of a number or a letter.
  • Table 1 gives an example of how the data entry variants can be defined: Table 1 EV GN GA Km 1 1 5.0. CV% 100 2nd 1 5.4. CV% 1,000 3rd 1 5.8. CV% 10,000 4th 2nd 4.7. CV% 10,000 5 5 3.7. CV% 10,000 6 10th 3.2. CV% 10,000 7 20th 2.9. CV% 10,000 8th 50 2.3. CV% 10,000
  • the fourth column shows the number of kilometers of tape on which the machine is switched off exactly once or an alarm is triggered due to normal statistical fluctuations in the unevenness.
  • Variants 1 to 3 are switched off after each exceedance, the probability of a switch off being between 100 and 10,000 km band due to the normal statistical fluctuations in the unevenness.
  • a limit value GN for the number of exceedances of 2, 5, 10, 20 or 50 is used; this is the probability of a shutdown due to the normal statistical fluctuations in the unevenness per 10,000 km band.
  • the limit value for thick spots DS is 4.19 g / m in the present case. If this limit value is exceeded over a length of 100 m band, the machine is shut down. An alarm without shutdown is triggered when the limit is a few percent lower.
  • the operating conditions of the system are such that the fiber sliver is scanned 2 420 times per second and the measured values are averaged over belt lengths of 4 cm. In the foreseeable future, this will result in a maximum delivery speed of 1000 m per minute and at least one measurement value per 4 cm belt length at lower delivery speeds. This in turn means that thick spots with a length of 4 cm are recorded with a certainty of 100%. Statistical studies show that even much shorter thick spots with a length of only 1 cm are still detected with a probability of 40%.
  • the existing limit can be individually expanded by entering additional percentages. For example, if the CV in variant 3 is 3.1%, the limit value GA is 18%. An entry of + 6% then results in a new limit of 24%.
  • the input and display of the setting variants EV and the input of additional percentages are carried out with the numerical machine terminal 9 (FIG. 1).

Landscapes

  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Spinning Or Twisting Of Yarns (AREA)
  • Preliminary Treatment Of Fibers (AREA)
  • Filamentary Materials, Packages, And Safety Devices Therefor (AREA)

Claims (10)

  1. Procédé pour le contrôle continu de la qualité dans le travail préparatoire à la filature par détection ou acquisition de variations de section transversale des rubans produits et par dérivation de paramètres de qualité du signal de mesure obtenu, les variations de ces paramètres de qualité de valeurs limites susceptibles d'être choisies étant détectés et l'un desdits paramètres étant formé par la non-conformité de masse, caractérisé en ce que les signaux de mesure sont comparés à une première valeur limite pour les écarts du poids de consigne du ruban contrôlé ou surveillé (2), qui est formée comme produit de la non-conformité de masse (CV%) et d'un facteur de valeur limite susceptible d'être choisi, et que chaque dépassement de la première valeur limite est interprété comme emplacement épais (DS).
  2. Procédé selon la revendication 1, caractérisé en ce que la valeur moyenne du poids de ruban est établie chaque fois pour une longueur prédéterminée de par exemple 100 mètres, et en ce que, dans le cas d'excursions du point de travail du poids de consigne ladite valeur moyenne constitue le poids de consigne.
  3. Procédé selon la revendication 2, caractérisé en ce que les dépassements de la première valeur limite par le signal de mesure sont comparés à une deuxième valeur limite pour le nombre admissible de dépassements par longueur de ruban, et que, lors d'un dépassement de la seconde valeur limite, est déclenchée une alarme et/ou la machine est arrêtée.
  4. Procédé selon la revendication 3, caractérisé en ce que le facteur de valeur limite est choisi de telle façon qu'en fonction de la deuxième valeur de consigne, la probabilité d'une alarme et/ou d'un arrêt par les variations statistiques normales de la non-conformité se trouve pour une alarme ou un arrêt à cent, mille ou dix mille kilomètres de ruban (2).
  5. Procédé selon la revendication 4, caractérisé en ce que différentes valeurs du facteur de valeur limite, de la première valeur limite et de la deuxième valeur limite sont réunis pour former des paires de valeurs formant chaque fois une variante de détection pour les emplacements épais (DS) et que ces variantes d'enregistrement sont caractérisées d'une façon correspondante, et que l'introduction des valeurs limites dans la machine s'effectue par l'introduction des variantes d'enregistrement correspondantes.
  6. Procédé selon la revendication 5, caractérisé en ce que des valeurs limites introduites dans la machine peuvent être individuellement élargies par introduction de chiffres de pourcentages supplémentaires.
  7. Agencement pour la mise en oeuvre du procédé selon la revendication 1, comprenant un capteur pour le palpage de la section transversale de ruban et avec une unité d'exploitation pour l'exploitation des signaux de capteur, qui comprend un premier canal (K1) pour la détermination de la non-conformité de masse et un second canal (K2) qui mesure les écarts de numéro de ruban de la valeur de consigne, caractérisé en ce que l'unité d'exploitation comprend un troisième canal (K3) pour l'analyse des signaux de capteur quant aux dépassements d'une première valeur limite réglable et correspondant à l'augmentation de la section transversale du ruban (2) et dont la grandeur est co-déterminée par la non-conformité de masse déterminée dans le premier canal (K1).
  8. Agencement selon la revendication 7, caractérisé par des moyens pour l'enregistrement du nombre de dépassements de la première valeur limite et pour la comparaison de ce nombre à une deuxième valeur limite pour le nombre admissible de dépassements par longueur de ruban, et par des moyens pour déclencher une alarme (6) et/ou l'arrêt de la machine (7) lors d'un dépassement de la deuxième valeur limite.
  9. Agencement selon la revendication 8, caractérisé en ce que la valeur limite précitée est susceptible d'être introduite sous forme de valeurs de tableau dans la machine, le tableau comprenant plusieurs paires de valeurs réunies.
  10. Agencement selon la revendication 9, caractérisé en ce que la première valeur limite introduite dans la machine peut être élargie individuellement par l'introduction de chiffres supplémentaires.
EP93120469A 1993-01-13 1993-12-18 Procédé et appareil pour le contrÔle continu de la qualité dans le travail préparatoire à la filature Expired - Lifetime EP0606615B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CH82/93 1993-01-13
CH8293A CH686446A5 (de) 1993-01-13 1993-01-13 Verfahren und Vorrichtung zur On-line Qualitaetsueberwachung im Spinnereivorwerk.

Publications (2)

Publication Number Publication Date
EP0606615A1 EP0606615A1 (fr) 1994-07-20
EP0606615B1 true EP0606615B1 (fr) 1996-08-28

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EP93120469A Expired - Lifetime EP0606615B1 (fr) 1993-01-13 1993-12-18 Procédé et appareil pour le contrÔle continu de la qualité dans le travail préparatoire à la filature

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Country Link
US (1) US5426823A (fr)
EP (1) EP0606615B1 (fr)
CN (1) CN1056204C (fr)
CH (1) CH686446A5 (fr)
DE (1) DE59303579D1 (fr)

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19547544A1 (de) * 1995-12-20 1997-06-26 Schlafhorst & Co W Verfahren zum Überprüfen des Fadenprofils
DE19615422A1 (de) * 1996-04-19 1997-11-20 Boehringer Ingelheim Kg Zweikammer-Kartusche für treibgasfreie Dosieraerosole
AU9336698A (en) * 1997-10-21 1999-05-10 Rieter Elitex A.S. A method of yarn spinning by transforming a fibre bundle on a spinning machine and a spinning machine for carrying out the method
WO2000052239A1 (fr) * 1999-03-04 2000-09-08 Zellweger Luwa Ag Procede et dispositif de controle de la qualite de bandes textiles
DE10335856A1 (de) * 2003-08-06 2005-03-03 Rieter Ingolstadt Spinnereimaschinenbau Ag Verfahren und Vorrichtung zum Messen der Bandmasse und/oder der Bandmasseschwankungen eines laufenden Faserverbandes sowie Spinnereivorbereitungsmaschine mit einer Messvorrichtung
CN106706651A (zh) * 2015-11-12 2017-05-24 江南大学 一种纺纱实时监测系统
CZ307017B6 (cs) * 2016-04-12 2017-11-15 Rieter Cz S.R.O. Způsob řízení textilního stroje obsahujícího řadu vedle sebe uspořádaných pracovních míst a textilní stroj
DE102020109963A1 (de) * 2020-04-09 2021-10-14 TRüTZSCHLER GMBH & CO. KG Anlage und Verfahren zur Herstellung eines gekämmten Faserbandes

Family Cites Families (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5917203B2 (ja) * 1975-09-06 1984-04-20 株式会社豊田自動織機製作所 カ−ドにおけるスライバ太さむら制御方法及びその装置
DE2543839B1 (de) * 1975-10-01 1976-11-25 Graf & Co Ag Vorrichtung zum erzeugen eines gleichmaessigen textilen faserbandes
CH668833A5 (de) * 1986-01-16 1989-01-31 Zellweger Uster Ag Vorrichtung zum messen und/oder vergleichmaessigen der banddicke von faserbaendern.
US4766647A (en) * 1987-04-10 1988-08-30 Spinlab Partners, Ltd. Apparatus and method for measuring a property of a continuous strand of fibrous materials
DE3803353A1 (de) * 1988-02-05 1989-08-17 Truetzschler & Co Vorrichtung zur gewinnung von messgroessen, die der dicke von in der spinnereivorbereitung anfallenden faserverbaenden, z.b. kardenbaendern o. dgl. entsprechen
US5010494A (en) * 1988-09-09 1991-04-23 North Carolina State University Method and apparatus for detecting mechanical roll imperfections in a roller drafting system
DE3834110A1 (de) * 1988-10-07 1990-04-12 Truetzschler & Co Verfahren und vorrichtung zur bewegungserfassung von textilfaserbaendern, z. b. kardenbaendern
EP0376002B1 (fr) * 1988-12-22 1994-04-06 Maschinenfabrik Rieter Ag Machine de peignage
US5248925A (en) * 1989-07-31 1993-09-28 Rieter Machine Works, Ltd. Drafting arrangement with feedback drive groups
DE59010914D1 (de) * 1989-08-11 2000-11-16 Rieter Ag Maschf Streckwerk mit vermaschter Regelung
CH680931A5 (fr) * 1990-03-08 1992-12-15 Loepfe Ag Geb
US5152033A (en) * 1991-07-15 1992-10-06 Myrick-White, Inc. Textile apparatus/method for reducing variations in silver weight
JPH0735602B2 (ja) * 1991-07-26 1995-04-19 佳男 新田 異常繊度発生防止方法

Also Published As

Publication number Publication date
CN1092121A (zh) 1994-09-14
DE59303579D1 (de) 1996-10-02
US5426823A (en) 1995-06-27
EP0606615A1 (fr) 1994-07-20
CH686446A5 (de) 1996-03-29
CN1056204C (zh) 2000-09-06

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