EP0548023A1 - Commande de débit d'une ligne de nettoyage - Google Patents

Commande de débit d'une ligne de nettoyage Download PDF

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Publication number
EP0548023A1
EP0548023A1 EP92810986A EP92810986A EP0548023A1 EP 0548023 A1 EP0548023 A1 EP 0548023A1 EP 92810986 A EP92810986 A EP 92810986A EP 92810986 A EP92810986 A EP 92810986A EP 0548023 A1 EP0548023 A1 EP 0548023A1
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EP
European Patent Office
Prior art keywords
control
throughput
time
delivery device
buffer
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Withdrawn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
EP92810986A
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German (de)
English (en)
Inventor
Urs Dr. Meyer
Hans Röösli
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.)
Maschinenfabrik Rieter AG
Original Assignee
Maschinenfabrik Rieter AG
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Filing date
Publication date
Application filed by Maschinenfabrik Rieter AG filed Critical Maschinenfabrik Rieter AG
Publication of EP0548023A1 publication Critical patent/EP0548023A1/fr
Withdrawn legal-status Critical Current

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    • 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
    • D01H13/32—Counting, measuring, recording or registering devices

Definitions

  • This invention relates to controls or control methods for blowroom lines, in particular (but not exclusively) for short-staple spinning.
  • the blowroom line consists of a chain of funding points and stores.
  • the delivery points are controlled by the filling level of the subsequent storage.
  • the throughput control of the delivery points is infinitely variable by adjusting the delivery quantity and at the same time according to the on / off principle, because the infinitely variable adjustment range is limited for technological reasons and does not reach the delivery quantity zero.
  • the function of the entire blowroom line depends on the fact that each of the stores involved is at least partially filled, but never overfilled and never empty.
  • the top priority is therefore to switch the funding on and off, based on an upper and lower limit. At the same time, this represents the minimum of control effort that is necessary for the operation of the blowroom line. This determination applies even if the use of special control loops succeeds in regulating the throughput in such a way that the permissible maximum or minimum of the respective memory content is never reached.
  • the present control concept now solves the task of automatically adapting the throughput of the individual delivery stages in addition to the described minimal system in such a way that a desired on / off ratio is maintained. This ensures a good cleaning effect of the stage in question, but also enables the alternating dishes of several cleaning lines from a single bale opener. This is because it is necessary to divide the switch-on time by including a sufficient reserve.
  • the proposed controller controls the throughput of the stage concerned by means of a three-value output signal "increase throughput", "no change", “reduce throughput”. This control takes place step by step with time blocks, for example.
  • a servomotor in the relevant stage, which, for example, actuates a potentiometer for the setpoint of a speed controller.
  • the conversion of the controller output into a change in the throughput can, however, also be achieved almost continuously with a direct digital control.
  • the controller is given a specific on / off ratio as the setpoint.
  • the entry is preferably made as a numerical value via a keyboard.
  • the controller only has the on / off signal of the relevant feed level as the actual value.
  • the absence of a separate sensor system is a decisive advantage of the concept.
  • the function of the controller is enabled or blocked based on the operating status of the entire blowroom line.
  • the line comprises a bale removal machine 10, a pre-cleaner 12, a mixing machine 14 and a post-cleaner 16, which in this case serves as a feed machine for the downstream carding machine (i.e. the feed machine of the system according to EP 311831 is no longer necessary).
  • the carding machine is known to comprise a plurality of individual machines, of which only three machines (20, 22, 24) are shown as examples in FIG. 1.
  • Each card comprises a filling shaft 26 and the post-cleaner 16 is also provided with a schematically illustrated filling shaft 28.
  • the mixing machine 14 comprises a box store 30.
  • the pre-cleaner 12 has no store and accordingly has to continuously process and forward the material supplied to it by the bale removal machine 10.
  • the mixing machine 14 further comprises a pair of delivery rollers 32, which removes material from the box 30 during operation and conveys it via a schematically illustrated pipeline into the filling shaft 28 of the post-cleaner 16.
  • the post-cleaner 16 itself has a pair of delivery rollers 34, which passes material from the shaft 28 into the distribution network of the carding machine, where this material is then filled into the shafts 26 of the individual cards.
  • the filling shaft 28 of the post-cleaner 16 is provided with a corresponding sensor system 38, which controls the operation of the pair of delivery rollers 32 via a further flow control 44.
  • a further sensor system 40 is assigned to the distribution network of the carding machine and controls the delivery roller pair 34 of the post-cleaner 16 via a further flow control 46. In the example according to FIG 303023) are assigned to the transport line of the distribution network.
  • the bale removal machine 10, the mixing machine 14 and the post-cleaner 16 therefore serve as delivery devices and the box storage 30, the filling chute 28 and the filling chutes 26 serve as material buffers which are supplied with material by the delivery devices.
  • a separate flow control 42, 44 or 46 is provided for each controllable stage, i.e.
  • the system according to Fig. 1 of this application differs from a system according to Fig. 4 of our previous European Patent No. 311831 in that the flow control is not central, e.g. is realized via a microcomputer, but the delivery relationships of the individual stages are individually controlled or regulated.
  • the precleaner 12 does not represent a controllable stage and accordingly no flow control is provided for this stage.
  • the flow controls 42, 44, 46 are each constructed according to the same basic scheme, which scheme will now be explained with reference to FIG. 2. 2 shows the control 44 as an example.
  • Each flow control accordingly comprises an input 50 for the status signals from the corresponding sensors 36, 38, 40. These signals are converted by a switching unit 52 into switch-on or switch-off signals for the corresponding delivery device and forwarded to the corresponding delivery device via an output 54 of the flow control. The operation of the delivery device, at least in the sense of delivery to the downstream stage, is accordingly switched on or set.
  • the signals on input 50 are also supplied to a computing unit 56, which is described in more detail below with reference to FIG. 3.
  • the computing unit 56 also receives signals from a setpoint adjuster 58, wel cher determines a target value for the duration of the uninterrupted operation of the controlled delivery device.
  • the computing unit 56 compares the actual value of the uninterrupted operating time of the delivery device with the setpoint determined by the setpoint adjuster 58 and generates a correction signal as a function of this comparison, which is forwarded to the flow controller of the controlled delivery device via the output 60 of the flow control.
  • the correction signal in the delivery device causes a change in the throughput of this delivery device, that is to say the currently released quantity of material per unit of time.
  • Three possible states are predetermined for the correction signal, namely "increase throughput", "unchanged” and "reduce throughput".
  • the flow control comprises a further input 62, with which a setpoint for the on / off ratio of the controlled delivery device can be determined, e.g. by using a suitable keyboard. This means that this value indicates for which percentage of an arbitrarily long time interval the controlled delivery device should convey material to the downstream buffer and for which percentage of the same interval the delivery of the buffer should be stopped.
  • This setpoint is input to the setpoint adjuster 58, along with the status signals received via input 50.
  • the setpoint adjuster 58 compares the achieved on / off ratio (actual value) with the setpoint determined at the input 62 and derives the above-mentioned setpoint for the on-time period, which is passed on to the computing unit 56.
  • fuzzy logic fuzzy logic
  • This setpoint adjuster 58 is e.g. a classic digital PI controller that compares the instantaneous value (actual value) of the on / off ratio with the setpoint for this ratio and generates a corresponding output signal. So there are no new principles here.
  • the actual value for the on / off ratio is e.g. given by an evaluation unit 64 (see also FIG. 2) which evaluates the signal arriving at the input 50 (FIG. 2) and generates a corresponding output signal.
  • the conversion of the output signal from the setpoint adjuster 58 into a suitable correction signal at the output 60 is done by the computing unit 56, which in the example according to FIG. 3 comprises three elements 66, 68, 70.
  • a comparison takes place in element 66 between the setpoint for the one-time determined by the setpoint adjuster 58 (according to classic principles) and the actual value for the one-time determined by the evaluation unit 64.
  • Element 66 generates a corresponding correction, which, however, is not based on classic principles but on an empirically determined membership function, e.g. 4A is determined. According to this function, there is no output signal if the one-time actual value lies within a specifiable bandwidth X around the setpoint. This ratio is indicated in FIG. 4A by the number 1, where the one-time actual value is the same as the one-time setpoint.
  • an output signal is generated.
  • This signal requests an increase in the throughput of the controlled delivery device in order to fill the supplied buffer correspondingly faster and to reduce the actual value for the one-time period accordingly, ie to move in the direction of the setpoint.
  • the correction signal is generated according to the membership function K1 (FIG. 4A). However, the maximum throughput correction is capped (Kpm., Fig. 4A), so that an actual value / setpoint ratio above the bandwidth Y (FIG. 4A) leads to this maximum correction.
  • the element 66 If the one-time actual value is too small compared to the one-time setpoint, namely so small that the ratio outside the bandwidth X lies within a bandwidth Z (FIG. 4A), then the element 66 generates an output signal which is based on the membership function K2 is determined.
  • the throughput of the controlled delivery device is reduced in order to slow down the filling of the supplied buffer (to increase the actual value).
  • this output signal also has a maximum value Knm, which limits the slowing down of the filling, even if the one-time actual value / one-time setpoint value ratio is below the range Z.
  • the basic principle of this correction system is to generate a signal which demands "more”, “less” or “the same amount” from the delivery device.
  • Fig. 4A The overall characteristic of Fig. 4A is referred to here as a "fuzzy set".
  • This output signal is superimposed with a second membership function, namely by element 68.
  • Element 68 receives a signal from evaluation unit 64 which represents the actual value of the current on / off ratio.
  • the element 68 then adjusts the correction generated by the element 66 according to the membership function K3 (FIG. 4B), depending on the actual value of the on / off ratio.
  • K3 the membership function K3 (FIG. 4B)
  • this membership function only a relatively small percentage of the full correction generated by element 66 is passed on for a high actual value for the on / off ratio, while almost full correction is forwarded for a low actual / on value.
  • fuzzy set The overall characteristic according to FIG. 4B is also referred to here as a "fuzzy set”.
  • fuzzy set The combination of fuzzy sets 1 and 2 (FIGS. 4A and B) results in a “fuzzy controller” (or “fuzzy controller”) that works on the basis of these sets.
  • Element 68 passes on a signal which has been determined according to the transformation rules of FIGS. 4A and 4B and can be converted by element 70 into a suitable control signal for the delivery device. This signal then appears on output 60 (Fig. 2).
  • the signal is e.g. from a control pulse, of which the duration of the pulse is determined as a predetermined function of the required correction.
  • Each controller can only be used under specified operating conditions according to the principles presented, and accordingly additional connections are provided which define "boundary conditions" so that the control is switched off or skipped if the necessary operating conditions are no longer present.
  • the flow control in particular, can no longer be used reliably if more than a predetermined number of cards request no material, e.g. more than two cards.
  • the cards are therefore provided with sensors (not shown) which indicate whether the respective card is in operation or not.
  • An evaluation unit (74, FIG. 1) determines whether the required number of cards is in operation and switches off the blowroom line via line L and flow controls 42, 44, 46 if too few cards remain in operation.
  • Another impermissible operating state is that a stage levels out to an "ideal value" so that it delivers material to the downstream stage practically continuously.
  • This state is determined by the evaluation unit 64 for the stage concerned.
  • This evaluation unit then generates a signal on the output 72 (FIG. 2), which is supplied to the unit 56 and requests an increase in the throughput of the controlled delivery device.
  • the supplied buffer is therefore filled faster and the on / off cycle is enforced. This cycle can then be regulated by the regulation already described.
  • An "increase throughput" command at output 72 is simultaneously provided by unit 64 to the previous stage via output 76 so that the entire line is commanded for faster operation at the same time.
  • the controller 42 naturally has no output 76 (since there is no preceding stage).
  • the controller 46 has no input to receive such a command (since there is no downstream stage in the sense of this controller).
  • Both the controller 42 and the controller 44 are each provided with an input 78 for receiving this command and for forwarding it to the unit 56 (FIG. 2) for implementation.
  • start values for the on-time of the controlled delivery device, although under start conditions there is no actual value of the on / off ratio at the setpoint adjuster 58. Such conditions occur both when the system is restarted and after an interruption in operation.
  • 3 therefore shows a memory 80 which, in the event of an interruption, stores the valid target value for the on time and supplies it to the element 66 when it is restarted.
  • a unit 82 is also provided which takes over the setpoint for the on / off ratio determined at the input 62 at a new start, converts it directly into a start value for the one-time setpoint and outputs the setpoint to the element 66.
  • FIG. 5A indicates the upper switching level with the upper dashed line and the lower switching level of the filling shaft or of the accumulator with the lower dashed line.
  • the delivery device is switched on when the level falls back to the lower switching level and is switched off again when the upper switching level is reached.
  • the changes in the fill level are shown with the full line PS.
  • the increase is influenced both by the throughput of the supplying delivery device and by the throughput of the material deduction, i.e. through the device (the pair of delivery rollers) which takes material from the storage (from the filling shaft).
  • the ascent is only influenced by the throughput of the material deduction.
  • Neither throughput is a predetermined constant. According to this version, however, these throughput values are automatically set at a level that enables constant processing conditions.
  • phase A the one-time setpoint (FIG. 5C) is determined by the memory 82, but the throughput setpoint of the supplying device (FIG. 5B) is not, since there is still no actual value for the one-time.
  • the system can be set in such a way that it "starts up” with a predetermined maximum throughput - block (i), FIG. 5B.
  • the supplied buffer fills up relatively quickly and the sensors switch off the delivery device. It is now possible (phase B) to carry out an actual value / setpoint comparison for the on-time in element 66, which leads to a throughput correction (downward) (kd 1).
  • a second phase B is initiated, i.e. the throughput is corrected again (kd 2).
  • a second correction (ke 2) of the one-time setpoint takes place.
  • a third correction (ke 3) of the one-time setpoint at the end of the third on / off cycle For example, no further corrections take place, since the throughput setting and one-time setting have been "found” - without any intervention by the operating personnel.
  • the system is "self-adjusting" without large fluctuations in the material processing conditions.
  • fuzzy controller does not operate according to the strict rules of fuzzy logic, but this would be possible and might offer advantages, especially if several parameters have to be taken into account in connection with the regulation of a given level .
  • the principles of the fuzzy controller make it possible to control or regulate the stages individually, i.e. independently of each other.
  • value classes e.g. "high”, “medium”, “low”
  • degree of membership of an actual value can be assigned to these classes from a specific parameter.
  • the parameters can be linked according to the rules of the logical form “if .... then .." (see Mr. Zimmermann's text book).
  • the example of the figures shown works without additional sensors.
  • the time sequence of the controller function is switched on or off. Controlled switching off of the relevant stage.
  • the essential information for the corrective intervention of the controller on the throughput is available after a complete on / off cycle when the switch-on phase has ended. Following this point in time, the Duration of the just past on phase and the on / off ratio calculated in the last cycle.
  • the duration of the on phase is compared with the associated setpoint according to the principle of the fuzzy controller.
  • the throughput correction is derived from the evaluation function of the fuzzy controller. This correction value is then corrected by a second fuzzy set, which roughly compensates for the non-linear relationship between throughput and on / off ratio.
  • the resulting correction value for the throughput is then converted into a suitable control signal, for example into a control pulse of a suitable duration.
  • a suitable control signal for example into a control pulse of a suitable duration.
  • the setpoint for the on-time is recalculated after each on / off cycle.
  • this is done by a weighted average between the existing one-time setpoint and the effective target value, which would result from the duration of the most recent cycle (digital PI controller).
  • This control loop takes the entire cycle time into account and therefore works more slowly. It gives the whole process the necessary precision and stability.
  • FIG. 6 schematically shows two successive processing stages (linked together) and a flow control according to FIG. 2 for the upstream stage.
  • the positions A, B, C, D indicate where certain disturbances entered on the figure could occur.
  • Table 1 shows a fault diagnosis (positions 1 to 7) with the possible reasons, possible consequences and the monitored signals and limit values.
  • Table 2 shows the reactions of the system, the diagnosis and the comments for the same positions.
  • the signal on line L can be designed with multiple terms. For example, it can represent an "On”, “Off”, "Empty” command and can also be selected by the operator. This signal can then be sent to the controls in addition to the signals already described (regarding the number of cards).

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Textile Engineering (AREA)
  • Preliminary Treatment Of Fibers (AREA)
  • Control Of Conveyors (AREA)
EP92810986A 1991-12-17 1992-12-11 Commande de débit d'une ligne de nettoyage Withdrawn EP0548023A1 (fr)

Applications Claiming Priority (2)

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CH372491 1991-12-17
CH3724/91 1991-12-17

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Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0634507A1 (fr) * 1993-07-14 1995-01-18 Zellweger Luwa Ag Système pour augmenter la production de métiers à filer
US6421883B1 (en) 1999-11-24 2002-07-23 Maschinenfabrik Rieter Ag Selective cleaning line
FR2841909A1 (fr) * 2002-07-08 2004-01-09 Truetzschler Gmbh & Co Kg Procede et appareil de nettoyage pour machine de preparation au filage
CN101864621A (zh) * 2010-07-22 2010-10-20 天津滨海大田纺织有限公司 清梳联合机
EP3412804A1 (fr) * 2017-06-08 2018-12-12 Maschinenfabrik Rieter AG Procede et dispositif de commande de production dans un battage
CH714101A1 (de) * 2017-08-30 2019-03-15 Rieter Ag Maschf Vorrichtung zur Regelung eines Faserflockenstromes in einem Reiniger.

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0093235A1 (fr) * 1982-05-04 1983-11-09 Maschinenfabrik Rieter Ag Procédé pour ouvrir des balles de fibres
EP0311831A1 (fr) * 1987-10-08 1989-04-19 Maschinenfabrik Rieter Ag Régulation des étapes d'ouverture de fibres d'une installation de préparation à la filature

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0093235A1 (fr) * 1982-05-04 1983-11-09 Maschinenfabrik Rieter Ag Procédé pour ouvrir des balles de fibres
EP0311831A1 (fr) * 1987-10-08 1989-04-19 Maschinenfabrik Rieter Ag Régulation des étapes d'ouverture de fibres d'une installation de préparation à la filature

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
EDN ELECTRICAL DESIGN NEWS. Bd. 32, Nr. 8, 15. April 1987, NEWTON, MASSACHUSETTS US Seiten 201 - 204 PEDRO J. GUILAMO 'Fuzzy logic allows creation of precise process controllers' *
JOURNAL A. Bd. 31, Nr. 1, April 1990, ANTWERPEN BE Seiten 45 - 51 PROF IR. H.R. VAN NAUTA-LEMKE 'Trends in control engineering' *

Cited By (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5511371A (en) * 1993-07-14 1996-04-30 Zellweger Luwa Ag System for increasing the production of spinning machines
EP0634507A1 (fr) * 1993-07-14 1995-01-18 Zellweger Luwa Ag Système pour augmenter la production de métiers à filer
US6421883B1 (en) 1999-11-24 2002-07-23 Maschinenfabrik Rieter Ag Selective cleaning line
DE10230603B4 (de) * 2002-07-08 2017-06-14 Trützschler GmbH & Co Kommanditgesellschaft Verfahren und Vorrichtung an einer Spinnereivorbereitungsmaschine, z.B. Reiniger, Öffner, Karde o. dgl., zur Reinigung von Fasergut
FR2841909A1 (fr) * 2002-07-08 2004-01-09 Truetzschler Gmbh & Co Kg Procede et appareil de nettoyage pour machine de preparation au filage
DE10230603A1 (de) * 2002-07-08 2004-01-29 Trützschler GmbH & Co KG Verfahren und Vorrichtung an einer Spinnereivorbereitungsmaschine, z.B. Reiniger, Öffner, Karde o. dgl., zur Reinigung von Fasergut
US6865781B2 (en) 2002-07-08 2005-03-15 Trutzchler Gmbh & Co. Kg Method and apparatus at a spinning preparation machine for cleaning fiber material
CN101864621A (zh) * 2010-07-22 2010-10-20 天津滨海大田纺织有限公司 清梳联合机
EP3412804A1 (fr) * 2017-06-08 2018-12-12 Maschinenfabrik Rieter AG Procede et dispositif de commande de production dans un battage
CH713861A1 (de) * 2017-06-08 2018-12-14 Rieter Ag Maschf Produktionssteuerung in einer Putzerei.
CN109023599A (zh) * 2017-06-08 2018-12-18 里特机械公司 清花车间中的生产控制
US10619270B2 (en) 2017-06-08 2020-04-14 Maschinenfabrik Rieter Ag Production control in a blow room
CN109023599B (zh) * 2017-06-08 2022-04-26 里特机械公司 清花车间中的生产控制
CH714101A1 (de) * 2017-08-30 2019-03-15 Rieter Ag Maschf Vorrichtung zur Regelung eines Faserflockenstromes in einem Reiniger.

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