EP0541794A1 - Verfahren und vorrichtung zur korrektur des reguliereinsatzpunktes und der regulierintensität - Google Patents
Verfahren und vorrichtung zur korrektur des reguliereinsatzpunktes und der regulierintensitätInfo
- Publication number
- EP0541794A1 EP0541794A1 EP93900011A EP93900011A EP0541794A1 EP 0541794 A1 EP0541794 A1 EP 0541794A1 EP 93900011 A EP93900011 A EP 93900011A EP 93900011 A EP93900011 A EP 93900011A EP 0541794 A1 EP0541794 A1 EP 0541794A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- signal
- regulation
- regulating
- point
- measuring point
- 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.)
- Granted
Links
Classifications
-
- D—TEXTILES; PAPER
- D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
- D01H—SPINNING OR TWISTING
- D01H5/00—Drafting machines or arrangements ; Threading of roving into drafting machine
- D01H5/18—Drafting machines or arrangements without fallers or like pinned bars
- D01H5/32—Regulating or varying draft
- D01H5/38—Regulating or varying draft in response to irregularities in material ; Measuring irregularities
- D01H5/42—Regulating or varying draft in response to irregularities in material ; Measuring irregularities employing electrical time-delay devices
Definitions
- the invention relates to a regulating drafting device of the textile industry, i. H. a drafting system in which the delay can be controlled or regulated changed.
- regulation here encompasses the use of a control or meshed regulation.
- slivers are used for processing in which a uniform thickness of the end material is required.
- the task of regulation is to detect this change in the thickness of the sliver and to compensate for it by changing the delay.
- the thickness signals are recorded at the measuring point in front of the drafting system entrance.
- the associated measurement signal is buffered with a time delay on the subsequent path of the measured sliver parts to the delay point.
- this delay time has elapsed, the regulation is used immediately in accordance with the deviation from the sliver thickness. This point of use is the regulating point of use.
- the problem here is that the regulating application point is not too early or too late in relation to the default point, because that would be a default.
- the regulation intensity, ie the Gain should not be too small or too strong.
- the mechanical assemblies for driving the drafting rollers cannot follow quickly enough due to their inertia. In this case, it is hardly possible to fully compensate for the fluctuation in thickness.
- the problem is exacerbated by the need to increase the speed of the sliver from an average of 500 m per minute to 800 m per minute and more.
- the DE-OS 36 19 248 proposes a correction value for the Ver ⁇ delay time in dependence on the slope or the relati ⁇ ven * size to determine the variation in mass.
- the result is a reduction in the delay time depending on the slope and the size of the mass fluctuation.
- This solution has the disadvantage that the result of the regulation cannot be checked.
- This is disadvantageous in that the corrective action is influenced by machine-internal influences or environmental influences can be .
- the solution according to EP 412 448 suggests the use of a meshed control on the drafting system, the measurement signal being detected and evaluated after the drafting system output.
- the purpose of the solution is to determine the result of the controlled distortion change by monitoring at the drafting system outlet, to return it to the same control system and to evaluate it separately in accordance with a low-frequency and high-frequency component in an optimization process.
- the manipulated variable Y optimized by the main control is thus used as the setpoint for the controller 8.2 of the drive for the main drafting range 12 (EP 412 488, page 12, 12th-15th line).
- This solution also assumes that the measured values are always used for a setpoint optimization.
- the decisive deficiency with this procedure is that the correction values to be used for the adjustment of the setpoints are not processed independently and therefore not influenced by the regulating system.
- the "band test” has so far been carried out.
- the “tape test” is carried out manually and on a random basis to determine the correct adjustment of fluctuations in the sliver thickness.
- a test tape is created. The operator places a single section of tape on the template tapes or creates a limited tape interruption by tearing the tape. The length of this sliver produced is cut out and its actual sliver thickness is determined by weighing (see operating instructions RIETER Spinning Systems, section RSB 851, SB 851, point 4.5.6., Edition 8/1990). A production stop in the minute range is therefore unavoidable. This is a major disadvantage for continuous production at high production speeds.
- the object of the invention is to provide a method and a device which improves the correction of the regulating point of use and the regulating intensity at a regulation of the drafting system.
- a feature of the method according to the invention is to only search for individual events of the fiber band thickness and to start the method working independently of the existing regulation system in order to start within a predetermined time range, it is necessary to determine and carry out any corrections to the regulation system (ie correction of the point of use of the regulation or the regulation intensity) that become necessary.
- the method according to the invention is therefore not constantly in operation. The method is started up only when a special signal is detected and is stopped after a predetermined period of time.
- the method is not a feedback of the controlled variable in the sense of a closed control loop or a feedforward control.
- the method consists in that a transient signal of the fiber band thickness is present at measuring point 1.
- the transient signal must have a high amplitude so that the tolerance limit of the sliver thickness is clearly exceeded with sufficient time. At the same time, this amplitude must have a slope that is significantly different from a permanently increasing fiber sliver thickness, but is smaller than that of a needle pulse.
- This signal must be similar to a jump signal.
- This step signal is fed to the regulation and at the same time used to start the method according to the invention for correcting the regulating point of use and the regulating intensity.
- the response signal is recorded as a pulse diagram at the drafting system output and its change compared to the jump signal is evaluated in order to correct the regulating point of application and the regulating intensity. The procedure is ended after a defined period of time.
- assemblies are installed parallel to the existing regulation, which both enable a transient signal to be recognized and also enable the response signal to be evaluated with regard to the point of use of the regulation and the intensity of regulation.
- the advantage of the method is that it works independently of and without influence from an existing regulation.
- the correction value is thus determined more precisely since machine-internal influences or environmental influences on the delay point can be taken into account better.
- Figure 1 Block diagram of the method and device
- Figure 2d response signal, regulating use too early and amplification too high
- Figure 3 Block diagram of the method and device without reserve tape feed.
- FIG. 1 shows the block diagram for the method according to the invention with the essential features of the device.
- the sliver 5 passes through a measuring point 1.
- This measuring point 1 can be, for example, a pair of mechanical sensing rollers.
- the feed roller of the reserve belt feed 3 with the reserve belt 4 is shown.
- the sliver is warped.
- a measuring point 2 is arranged at the exit of the drafting system.
- the conventional regulating system 7 receives the measuring signals from the measuring point 1. These measured signals are stored in a measured value memory 7.1 with a time delay and passed on to an amplifier 7.2, the signal being forwarded from the output of the amplifier 7.2 to an actuator 7.3.
- the actuator 7.3 changes the speed of a pair of rollers in the drafting system 6, so that the delay changes.
- an assembly 8 was installed for this regulating system 7 described.
- This assembly 8 of the method according to the invention operates in parallel and independently of the conventional regulating system 7.
- the assembly 8 shows a control unit 8.1, a measured value evaluation 8.2, a counting and evaluating unit 8.3 and an averager 8.4, an intermediate.
- a reserve belt feed has the task of avoiding production downtimes due to fiber sliver breakage or belt end in a can.
- the function of the reserve tape feed 3 is transferred to another area of application for the purpose according to the invention.
- the reserve tape feed 3 is used in a double function as part of a device for performing the method.
- Control unit 8.1 gives a start signal to the reserve tape feed. After a defined time of the reserve tape feed, the reserve tape feed 3 is stopped again. This duration corresponds to the required duration of the procedure.
- the supply belts can even generate a transient signal at the measuring point 1 in front of the drafting system 6 by random deviation of the sliver thickness.
- the prerequisite is that the transient signal has a high amplitude.
- the amplitude must deviate by approx. 10% from the mean value and there must be a time period (at least three clock pulses of the measuring cycle). This signal must be recognized.
- a measured value analysis 8.0 is arranged between measuring point 1 and control unit 8.1 (FIG. 3). With the measured value analysis 8.0, a comparison value is established by means of long-term averaging of the measured values. An excess of at least 10% of the comparison value is detected as a threshold value exceeding by the measured value analysis 8.0.
- the amplitude must last for at least a period of three clock pulses. In parallel to the determination of the amplitude, its steepness is determined. If the steepness of the slope increases at the same time, the required transient signal is found. The process is started when such a signal is detected. The method is ended after a predetermined number of clock pulses. The number of clock pulses corresponds at least to that Pass from measuring point 1 to measuring point 2.
- a defi ned jump signal according to FIG. 2a (represented in idealized form) is triggered when the reserve belt is switched on or by random deviation of the sliver thickness.
- This jump signal is given to the measuring point and the time course of the output signal is measured with measuring point 2 at the output of drafting device 6.
- the output signal can take idealized forms, for example, as shown in FIG. 2b, FIG. 2c, FIG. 2d or FIG. 2e.
- the measured value evaluation 8.2 following the measuring point 2 has two paths in the output, one path for the control of the regulating point of use and another path for the control of the regulating intensity.
- the measuring point 1 registers an abrupt increase in the sliver thickness. That corresponds to the jump signal.
- the control unit 8.1 receives the information about the start of the method.
- the measured value evaluation 8.2 starts the averager 8.4. This first detects those signals which are present until the response signal arrives, i.e. of the corrected band, enter the measured value evaluation 8.2 at the measuring point 2.
- These mean values formed are stored in the buffer store 8.5.
- the mean value generator 8.4 When the first edge of the response signal arrives, the mean value generator 8.4 will again form mean values for the duration of the passage of the response signal. However, these mean values are fed directly to the comparator 8.6, which now also receives its values from the buffer store 8.5. The difference in amount between the basic signal level at the start of the reserve band and the basic signal level supplied with the response signal is determined in comparator 8.6. A possible difference from the comparison corresponds to a measure of the regulatory intensity. The output of the comparator 8.6 goes to an amplifier 7.2, which realizes the intensity of the amplification in accordance with the difference in amount and its polarity.
- the counting and evaluation unit 8.3 starts via the measured value evaluation 8.2. After the first pulse of the response signal has run through, the counting and evaluation unit 8.3 is stopped again. This result is delivered to the measured value memory 7.1.
- the number of clock cycles of the first pulse of the response signal provides the characteristic value for the size of the incorrect adjustment of the regulation.
- the phase alga (polarity) says something about the direction of the misadjustment, i.e. when the phase is positive, the regulating operation is too slow, when the phase is negative, it is too fast.
- the last pulse of the response signal is disregarded. This is always a subsequent impulse of opposite polarity to the first.
- the simplicity of this process step is that the length of this counted pulse is already a measure of the time at which the control is used.
- This characteristic value is fed to the measured value memory 7.1, which at the same time corrects the control point of use in accordance with the characteristic value.
- a characteristic of the counting and evaluation unit 8.3 is that it is started and stopped by the measured value evaluation 8.2 and operates according to a machine-dependent measuring cycle 7.4.
- the machine-dependent measurement timing 7.4 is synchronized with the fiber belt speed, so that the pulse diagram is evaluated at the correct times.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Textile Engineering (AREA)
- Spinning Or Twisting Of Yarns (AREA)
- Preliminary Treatment Of Fibers (AREA)
- Control Of Metal Rolling (AREA)
Description
Claims
Applications Claiming Priority (5)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE4118242 | 1991-06-04 | ||
DE4118242 | 1991-06-04 | ||
DE4215682 | 1992-05-13 | ||
DE4215682A DE4215682B4 (de) | 1991-06-04 | 1992-05-13 | Verfahren und Vorrichtung zur Korrektur des Reguliereinsatzpunktes und der Regulierintensität |
PCT/EP1992/001203 WO1992022692A2 (de) | 1991-06-04 | 1992-05-29 | Verfahren und vorrichtung zur korrektur des reguliereinsatzpunktes und der regulierintensität |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0541794A1 true EP0541794A1 (de) | 1993-05-19 |
EP0541794B1 EP0541794B1 (de) | 2001-05-09 |
Family
ID=25904224
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP93900011A Expired - Lifetime EP0541794B1 (de) | 1991-06-04 | 1992-05-29 | Verfahren und vorrichtung zur korrektur des reguliereinsatzpunktes und der regulierintensität |
Country Status (5)
Country | Link |
---|---|
EP (1) | EP0541794B1 (de) |
JP (1) | JP3377208B2 (de) |
CZ (1) | CZ13793A3 (de) |
ES (1) | ES2050639T1 (de) |
WO (1) | WO1992022692A2 (de) |
Families Citing this family (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE19615947B4 (de) * | 1996-04-22 | 2007-10-31 | Rieter Ingolstadt Spinnereimaschinenbau Ag | Minimalwert-suchende Regulierungsoptimierung |
DE10041892A1 (de) * | 2000-08-25 | 2002-03-07 | Truetzschler Gmbh & Co Kg | Vorrichtung an einer Regulierstrecke für Faserbänder zum direkten Ermitteln von Einstellwerten für den Reguliereinsatzpunkt |
DE10041893A1 (de) * | 2000-08-25 | 2002-03-07 | Truetzschler Gmbh & Co Kg | Vorrichtung an einer Regulierstrecke zum direkten Ermitteln von Einstellwerten für den Reguliereinsatzpunkt |
DE10214649A1 (de) | 2002-04-02 | 2003-10-16 | Rieter Ingolstadt Spinnerei | Vorrichtung zum Optimieren der Reguliereinstellungen einer Spinnereimaschine sowie entsprechendes Verfahren |
Family Cites Families (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CH668781A5 (de) * | 1984-09-25 | 1989-01-31 | Zellweger Uster Ag | Verfahren und vorrichtung zur optimierung des streckprozesses bei regulierstrecken der textilindustrie. |
DE3619248A1 (de) * | 1986-06-07 | 1987-12-10 | Zinser Textilmaschinen Gmbh | Verfahren zur steuerung des verzugs eines faserbandes bei einer textilmaschine |
IT1227771B (it) * | 1986-07-04 | 1991-05-06 | Zinser Textilmaschinen Gmbh | Procedimento e dispositivo per regolare lo stiro di un nastro di fibre in una macchina tessile. |
DE3926014A1 (de) | 1989-08-05 | 1991-02-07 | Boerner Gmbh A | Vorrichtung zum schneiden von obst, gemuese oder dergleichen in scheiben |
DE59010914D1 (de) * | 1989-08-11 | 2000-11-16 | Rieter Ag Maschf | Streckwerk mit vermaschter Regelung |
-
1992
- 1992-05-29 ES ES93900011T patent/ES2050639T1/es active Pending
- 1992-05-29 EP EP93900011A patent/EP0541794B1/de not_active Expired - Lifetime
- 1992-05-29 WO PCT/EP1992/001203 patent/WO1992022692A2/de active IP Right Grant
- 1992-05-29 CZ CS93137A patent/CZ13793A3/cs unknown
- 1992-05-29 JP JP51013492A patent/JP3377208B2/ja not_active Expired - Fee Related
Non-Patent Citations (1)
Title |
---|
See references of WO9222692A2 * |
Also Published As
Publication number | Publication date |
---|---|
JP3377208B2 (ja) | 2003-02-17 |
WO1992022692A2 (de) | 1992-12-23 |
JPH06507682A (ja) | 1994-09-01 |
WO1992022692A3 (de) | 1993-02-04 |
ES2050639T1 (es) | 1994-06-01 |
EP0541794B1 (de) | 2001-05-09 |
CZ13793A3 (en) | 1994-04-13 |
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