EP2044430A2 - Procédé et agencement pour déterminer la qualité du fil et/ou la qualité de bobine d'un fil continu à l'aide d'anémometrie laser doppler - Google Patents

Procédé et agencement pour déterminer la qualité du fil et/ou la qualité de bobine d'un fil continu à l'aide d'anémometrie laser doppler

Info

Publication number
EP2044430A2
EP2044430A2 EP07786359A EP07786359A EP2044430A2 EP 2044430 A2 EP2044430 A2 EP 2044430A2 EP 07786359 A EP07786359 A EP 07786359A EP 07786359 A EP07786359 A EP 07786359A EP 2044430 A2 EP2044430 A2 EP 2044430A2
Authority
EP
European Patent Office
Prior art keywords
thread
yarn
running
speed
laser beam
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Withdrawn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
EP07786359A
Other languages
German (de)
English (en)
Inventor
Ferdinand Josef Hermanns
Peter Kohns
Martin Linden
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.)
Vienco GmbH
Original Assignee
Vienco GmbH
Hochschule Niederrhein
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 Vienco GmbH, Hochschule Niederrhein filed Critical Vienco GmbH
Publication of EP2044430A2 publication Critical patent/EP2044430A2/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
    • G01N21/84—Systems specially adapted for particular applications
    • G01N21/88—Investigating the presence of flaws or contamination
    • G01N21/89—Investigating the presence of flaws or contamination in moving material, e.g. running paper or textiles
    • G01N21/8914—Investigating the presence of flaws or contamination in moving material, e.g. running paper or textiles characterised by the material examined
    • G01N21/8915—Investigating the presence of flaws or contamination in moving material, e.g. running paper or textiles characterised by the material examined non-woven textile material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H59/00—Adjusting or controlling tension in filamentary material, e.g. for preventing snarling; Applications of tension indicators
    • B65H59/40—Applications of tension indicators
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H61/00—Applications of devices for metering predetermined lengths of running material
    • B65H61/005—Applications of devices for metering predetermined lengths of running material for measuring speed of running yarns
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H63/00—Warning or safety devices, e.g. automatic fault detectors, stop-motions ; Quality control of the package
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H63/00—Warning or safety devices, e.g. automatic fault detectors, stop-motions ; Quality control of the package
    • B65H63/003—Warning or safety devices, e.g. automatic fault detectors, stop-motions ; Quality control of the package responsive to winding of yarns around rotating cylinders
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H63/00—Warning or safety devices, e.g. automatic fault detectors, stop-motions ; Quality control of the package
    • B65H63/02—Warning or safety devices, e.g. automatic fault detectors, stop-motions ; Quality control of the package responsive to reduction in material tension, failure of supply, or breakage, of material
    • B65H63/024—Warning or safety devices, e.g. automatic fault detectors, stop-motions ; Quality control of the package responsive to reduction in material tension, failure of supply, or breakage, of material responsive to breakage of materials
    • B65H63/028—Warning or safety devices, e.g. automatic fault detectors, stop-motions ; Quality control of the package responsive to reduction in material tension, failure of supply, or breakage, of material responsive to breakage of materials characterised by the detecting or sensing element
    • B65H63/032—Warning or safety devices, e.g. automatic fault detectors, stop-motions ; Quality control of the package responsive to reduction in material tension, failure of supply, or breakage, of material responsive to breakage of materials characterised by the detecting or sensing element electrical or pneumatic
    • B65H63/0321—Warning or safety devices, e.g. automatic fault detectors, stop-motions ; Quality control of the package responsive to reduction in material tension, failure of supply, or breakage, of material responsive to breakage of materials characterised by the detecting or sensing element electrical or pneumatic using electronic actuators
    • B65H63/0324—Warning or safety devices, e.g. automatic fault detectors, stop-motions ; Quality control of the package responsive to reduction in material tension, failure of supply, or breakage, of material responsive to breakage of materials characterised by the detecting or sensing element electrical or pneumatic using electronic actuators using photo-electric sensing means, i.e. the defect signal is a variation of light energy
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H63/00—Warning or safety devices, e.g. automatic fault detectors, stop-motions ; Quality control of the package
    • B65H63/08—Warning or safety devices, e.g. automatic fault detectors, stop-motions ; Quality control of the package responsive to delivery of a measured length of material, completion of winding of a package, or filling of a receptacle
    • B65H63/082—Warning or safety devices, e.g. automatic fault detectors, stop-motions ; Quality control of the package responsive to delivery of a measured length of material, completion of winding of a package, or filling of a receptacle responsive to a predetermined size or diameter of the package
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
    • G01N33/36—Textiles
    • G01N33/365—Filiform textiles, e.g. yarns
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01P—MEASURING LINEAR OR ANGULAR SPEED, ACCELERATION, DECELERATION, OR SHOCK; INDICATING PRESENCE, ABSENCE, OR DIRECTION, OF MOVEMENT
    • G01P3/00—Measuring linear or angular speed; Measuring differences of linear or angular speeds
    • G01P3/36—Devices characterised by the use of optical means, e.g. using infrared, visible, or ultraviolet light
    • G01P3/366—Devices characterised by the use of optical means, e.g. using infrared, visible, or ultraviolet light by using diffraction of light
    • 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
    • B65H2557/50—Use of particular electromagnetic waves, e.g. light, radiowaves or microwaves
    • B65H2557/51—Laser
    • 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
    • B65H2557/60—Details of processes or procedures
    • B65H2557/65—Details of processes or procedures for diagnosing
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H2701/00—Handled material; Storage means
    • B65H2701/30—Handled filamentary material
    • B65H2701/31—Textiles threads or artificial strands of filaments

Definitions

  • the present invention relates to a method according to one of claims 1 or 4 or 25.
  • Winding units of modern textile machines for example for the production of cheeses, are equipped with devices for speed measurement and length measurement of the running thread.
  • Constantly increasing demands on the quality of the yarn have led to the monitoring of parameters of the yarn structure such as the yarn diameter not only at selected winding units, but at each individual winding unit.
  • the length of the deviation is usually used to evaluate whether a deviation from the nominal yarn diameter is to be classified as a yarn defect.
  • the determination of the exact defect length is therefore an essential part of the quality control of the yarn.
  • Classic mechanical measuring methods for measuring the speed of the running thread work with rolling measuring wheels.
  • friction is associated between the yarn and the surface of the measuring wheel.
  • the friction of sensitive threads can lead to disadvantageous quality impairments.
  • a device for measuring the speed of running textile threads on a winding device which operates according to the so-called correlation measuring method.
  • the measured values of two sensors arranged one behind the other at a fixed distance in the direction of movement of the textile thread are evaluated by means of a time-of-flight correlator in order to determine the yarn speed therefrom.
  • the two sensors work without contact and can, for example, operate on an optical or capacitive basis.
  • LDA laser Doppler anemometry
  • the basic principle of the LDA is based on the indirect measurement of the Doppler shift (shift of the light frequency) on moving scattering particles. It is a point-oriented non-contact optical process from laser measurement technology. With the Doppler effect, a frequency shift occurs, which depends on the relative speed with which the transmitter and receiver move relative to each other. By evaluating the frequency shift, it is thus possible to determine the velocity of a moving body when the receiver is stationary.
  • the reference beam LDA method uses a reference beam and a measuring beam.
  • the reference wave which is not shifted in frequency, and the reflected scattered light of the measuring beam shifted in accordance with the Doppler effect are superimposed in the receiver.
  • the reference beam method in its hitherto known embodiment, however, has the property that the intensity of the reference beam and the intensity of the measuring beam reflected from the surface usually deviate significantly in the ratio 5:95, to a good "signal-to-noise ratio" receive.
  • a laser beam is split by means of a beam splitter into two parallel partial beams of the same intensity. These sub-beams are then focused with an optic, in particular by means of a condenser lens. As a result, the two sub-beams are superimposed in the focal plane. The intersection is the measurement volume, in which the velocity of the particles is determined by measuring the scattered light.
  • the scattered light is recorded by imaging optics using a photodetector and evaluated by suitable electronics.
  • the imaging optics consists in the simplest case of a simple focusing lens. Depending on the structure, the optics can be extended with a shutter to shield the two partial beams and with a spatial filter.
  • the object of the present invention is to provide a method of the kind set forth which can be carried out with little effort and with which the winding process and / or the quality of the wound yarn and / or the quality of the wound coil can be monitored and / or optimized.
  • the yarn quality of a running yarn can be monitored without contact by means of a arranged in the yarn path of a textile machine sensor device and optionally optimized by a laser beam is generated by a light source by means of an optical part and steering means for dividing and steering the Laser beam is divided into at least two sub-beams, which are guided so that they meet again at the thread, wherein from the thread-influenced and / or reflected light according to the laser Doppler anemometry method generates measurement signals and the burst signals generated in this regard with respect to hairiness of the current thread are evaluated electronically.
  • the hairiness of the running yarn for determining the yarn quality can be detected in a relatively simple manner.
  • the burst signals (signal packets) generated by the LDA are caused primarily by the filament hairiness. If a large number of burst packets are generated at short intervals during the speed detection, it can be assumed that there is a high yarn hairiness. And accordingly, from a smaller number of burst packages, a lower amount of yarn hairiness can be deduced.
  • the hairiness of the running thread is compared continuously with at least one specific predetermined or predeterminable marginal hairiness and that issued when reaching or exceeding this Grenzhaarmaschine a warning signal and / or automatically reduces the winding speed and / or the yarn tension and / / or the winding process is ended automatically.
  • the quality of a coil which is obtained by winding a running thread, monitored by means of a arranged in the threadline of a textile machine sensor device and optionally optimized by a laser light source is generated by a light source by means of an optical part -
  • And steering means for dividing and steering the laser beam is divided into at least two sub-beams, which are guided so that they meet again at the thread, wherein from the thread-influenced and / or reflected light according to the laser Doppler anemometry method (LDA method) measuring signals are generated, which are evaluated electronically to determine and / or improve the quality of the coil.
  • LDA method laser Doppler anemometry method
  • the speed of the running thread is determined from the generated measurement signals over at least one or more time intervals and a velocity profile is formed therefrom.
  • the determination of the yarn speed according to the LDA method is known per se, for example, from DE 103 42 383 A1, to which reference can be made in this respect and to the contents of which reference is expressly made.
  • the speed profile formed in the context of the present invention is referred to below as the derived measurement result. It can be used for various evaluations described in more detail below.
  • the acceleration of the running yarn as a time derivative of the speed can advantageously be determined for at least one time interval.
  • the acceleration will be below also referred to as a derived measurement result and it can also be used for further evaluations.
  • the variance or the standard deviation of the velocity profile and / or the acceleration is formed.
  • the variance or standard deviation is also referred to below as the derived measurement result and can be used for further evaluations.
  • the speed profile can be compared with a predetermined desired speed profile and / or limit speed profile and / or the acceleration profile can be compared with a predetermined desired acceleration profile and / or limit acceleration profile.
  • the variance may be compared with a desired variance and / or a marginal variance, or the standard deviation with a Soü standard deviation and / or a marginal standard deviation.
  • individual comparisons alone as well as several comparisons can be carried out simultaneously or in succession. The automatically initiated reactions then depend on the results of the comparisons carried out.
  • the evaluation of one of the aforementioned derived measurement results can also be carried out by a frequency analysis, wherein a signal is generated as a reaction or the winding process automatically is influenced or interrupted or terminated when the frequency profile determined in the analysis of the frequency deviates from a desired frequency profile in a predetermined or predeterminable extent and / or when the determined frequency profile approaches or approaches a limit frequency profile up to a predetermined or predeterminable level exceeds.
  • a signal is generated as a reaction or the winding process automatically is influenced or interrupted or terminated when the frequency profile determined in the analysis of the frequency deviates from a desired frequency profile in a predetermined or predeterminable extent and / or when the determined frequency profile approaches or approaches a limit frequency profile up to a predetermined or predeterminable level exceeds.
  • the velocity profile from the time domain is transformed into the frequency domain and then analyzed in the frequency domain.
  • the measurement signals and / or one or more derived measurement results can be evaluated, for example, with regard to misdirections of the running thread on the spool and / or with regard to erroneous windings of the running thread on a drum (drum winding), in particular grooved drum, provided for driving the spool.
  • drum winding drum winding
  • this sensor Disadvantage of this sensor is that a shutdown can be determined only after the emergence of the roll from the drum and thus at a relatively late time.
  • the LDA sensor used according to the invention can detect the malfunction very early on, so that it is possible to respond accordingly quickly.
  • misdirections of the running yarn in particular drum windings, can be determined by analyzing the speed profile of the running yarn and / or the frequency of the speed profile.
  • the winding process can also be terminated automatically with a no longer tolerable level of misguiding or drum winding.
  • the measurement signals and / or one or more derived measurement results can advantageously also be evaluated with respect to the tensile load of the current yarn.
  • the determination of the yarn tension is derived by calculating the yarn acceleration from the measured speed signal. If, for example, one determines the height of the noise level on the acceleration signal by calculating the standard deviation, then a measure of the yarn tensile force peaks results during the winding process.
  • a warning signal is output and / or the pulling force acting on the thread and / or the winding speed is reduced and / or a Garnabzugbeschreiber adjusted and / or the winding process is terminated when the tensile load increases or a certain predetermined or exceeds predeterminable level, so as to avoid deterioration of the coil quality due to tensile forces peaks.
  • the measurement signals can advantageously also be evaluated with respect to one or more diameters of a coil. If, for example, a cylindrical drum drives a conical coil, only a very limited zone results on the spool stroke, in which the peripheral speeds of the drum are identical to those of the spool. This neutral zone is also referred to as the driving or driving diameter.
  • This diameter can conventionally be calculated by the ratio of reel speed to drum speed.
  • a disadvantage of this method is that in diameter-stopped winding sections, in which the winding section is terminated when reaching a certain diameter, in the case of a conical coil, this driving diameter is calculated as a storage diameter. For the end user of the product coils, however, it is not this diameter that is of concern, but the conical outside diameter. Furthermore, it must be considered that the driving diameter, depending on the winding conditions, can be located in different positions and anywhere on the bobbin stroke between small and large bobbin diameter.
  • the outer diameter and / or the inner diameter of a conical coil can be calculated directly at the reversal points of the threading by means of the highly dynamic speed measurement of the thread by means of an inventively used LDA sensor. This results in the following relationships:
  • the bobbin rotational speed and ⁇ s pu i e which is preferably a arranged on the coil activators possible, can be determined very accurately so taking into account the Verlegehubs also the outer or inner diameter of the conical bobbin ,
  • winding process is not only off when a certain diameter is reached, but that the exact position of the driving diameter can be output.
  • the measurement signals can advantageously also be evaluated with respect to the density of the coil.
  • the determination of the package density from the yarn count, the package geometry and the wound yarn length is a quality feature of the wound product. If, for example, the coil density varies greatly in a statistically comparable collective, then it can be assumed that the coil deviating from the collective can be described as having a lower thread tension and / or a too high contact pressure by the coil frame or other circumstances as reducing the quality.
  • the evaluation result thus obtained can directly influence the winding process.
  • information about the determined package density can be output and / or a warning signal can preferably be output if the package density exceeds a certain predetermined or predefinable limit value. It is also possible to change the thread tension and / or the winding speed automatically.
  • the slippage between the drum and the coil which is specifically generated by a picture interference method, can be monitored. If the slip deviates from a certain target value or exceeds or falls below a certain limit value, a warning signal can be output and / or advantageously the image disturbance can be automatically corrected.
  • the slip between the drum and the spool can be evaluated for an order of paraffin on the thread. If the coil angular velocity taken from the coil axis is used for the exact diameter determination via the above-described determination of the speeds at the reversal points, then the driving diameter of the conical coil can be used dynamically during the Winding process are recorded. Due to acceleration mechanisms (image disturbance) acting on the bobbin during winding operation, the position of the driving diameter will greatly migrate in the case of waxing, while without paraffin coating the position will remain relatively constant.
  • a warning signal can be output and / or the winding process can be terminated automatically if the paraffin application deviates from a predefinable target value or falls below a predefinable limit value.
  • the slip between the drum and the spool can be monitored when the spooling process starts up.
  • the drive is preferably regulated to a predeterminable slip or to a predeterminable slip profile.
  • the winding process is a discontinuous process that is interrupted several times (depending on the material and the bobbin diameter more than 40 times) due to the bobbin patterns.
  • Today's trend to steadily increase winding speeds (currently to 1800m / min) sets a limit due to the recurring ramp-ups of the associated increase in production.
  • One goal of the winder manufacturer is therefore to realize the fastest possible run-ups on the production speed and at the same time to keep the slip between the driving drum and the bobbin in a quantitatively predetermined limit.
  • the slip between the drive drum and the bobbin can be accurately determined and regulated via the drum drive via the detection of the exact winding speed with simultaneous detection of the drum speed, so that the aforementioned goal of the greatest possible increase in production at the same time high Production quality can be optimally achieved.
  • the quality of the coil production can be considered in terms of a possible breakage of the running thread and / or a possible pinching of the running thread between a spool, on which the thread is wound, and a drive roller driving the spool are monitored by means of a arranged in the threadline of a textile machine sensor device contactless and optionally optimized by a light source from a laser beam is generated by means of an optical part and steering Means for dividing and directing the laser beam is divided into at least two sub-beams, which are guided so that they meet again at the thread, being generated from the thread-influenced and / or reflected light according to the laser Doppler anemometry method measuring signals, which are evaluated electronically to determine a thread breakage and / or a Fadeneinklemmung.
  • winding techniques use a drive or support roller in the coil drive, the drive thus takes place directly over the spool axis or via the drive roller.
  • the thread laying is realized here via a separate unit.
  • the winding process is automatically terminated when a break or entrapment of the yarn is detected. Furthermore, the error can then be corrected automatically via an additional circuit control (winding process interruption with subsequent connection process and coil start-up).
  • the laser beam generated by the light source is divided and directed by means of a partial and steering device such that the two partial beams already at the exit from this part and steering device at an angle to each other directed run and intersect to form the measuring volume at the thread.
  • the laser beam generated by the light source can be shared without focus by the part and steering device and the two partial beams can be focused focus on the thread.
  • a one-piece wedge prism can be used, which is free of inner parting surfaces and contact surfaces.
  • the laser Doppler anemometry method can be carried out both as a reference beam method and as a two-beam method, both of which are well known. It will however, it is proposed to carry out the LDA method preferably as a reference beam method since, when used according to the invention, it offers the advantage that the received speed signal is considerably more intense, so that significant savings in analog amplifier technology can be realized.
  • the present invention further relates to an arrangement for carrying out a method of the type described above.
  • An arrangement for the non-contact determination of the structure and / or the speed of a running thread in the yarn path of a textile machine comprising a light source for generating a laser beam, an optical Partial and steering device, by means of which the laser beam can be divided into at least two partial beams which can be brought together on the thread and deflected accordingly, as well as an optical sensor device, by means of which the light influenced and / or reflected by the thread is subjected to the laser Doppler anemometry.
  • Measuring signals can be generated, which are supplied to determine and / or increase the quality of the running yarn and / or a wound coil and / or to determine a yarn breakage or a Fadeneinklemmung an electronic evaluation.
  • the arrangement, in particular its evaluation unit, is advantageously designed such that it is suitable for carrying out the method according to the invention described above.
  • the optical part and steering device is designed such that the exit of the two partial beams from this part and steering device so directed towards each other at an angle to that on the thread cross.
  • the partial and steering device may be formed by a one-piece wedge prism.
  • the two partial beams are directed in an advantageous manner focusing lens without focusing lens on the thread.
  • Figure 1 a schematic representation of an arrangement for carrying out the method according to the invention as a two-beam method
  • FIG. 2 shows a schematic representation of an arrangement for carrying out the method according to the invention as a reference beam method
  • FIG. 3 shows a schematic representation of an alternative arrangement for carrying out the method according to the invention as a reference beam method.
  • Figure 4 schematic representation of a conical coil which is driven by a drum
  • FIG. 5 velocity profile of a thread when properly laid on a spool
  • FIG. 6 velocity profile of a thread during a faulty laying on a spool
  • FIG. 8 shows the relationship between the thread tension and the standard deviation of the acceleration signal of one thread.
  • a diode laser 1 in conjunction with a collimating optics 2 is used as the light source.
  • the laser beam 3 generated thereby is directed with constant beam diameter onto a wedge prism 4 used as a part and steering device.
  • the wedge prism 4 which is free of inner parting surfaces and inner contact surfaces, the laser beam 3 is divided in the manner described below into two sub-beams 5a and 5b, which on a winding unit 6 of a textile machine not shown in the direction of the arrow 7 running thread 8 are directed.
  • a photodetector 9 and a receiving optics as the optical sensor device, which can in particular comprise collecting lenses 10 and / or diaphragms 11.
  • the wedge prism 4 formed by an obliquely cut-off glass cuboid has a partially transparent front side 12 and a rear side 13 running obliquely thereto at an angle ⁇ which is also partially transparent in the two-beam method illustrated in FIG. 1 and fully mirrored in the reference beam method illustrated in FIGS. 2 and 3 is.
  • the two partial beams 5 a and 5 b leave the front side 12 of the wedge prism 4 at an angle ⁇ directed obliquely toward one another, so that they intersect at the winding 8 in the region of the winding station 6.
  • a focusing of the partial beams 5a and 5b, for example by a converging lens does not take place, so that in the region of the intersection of the two partial beams 5a and 5b, a very large measuring volume with a diameter of about 2 to 3 mm with a diameter of about 3 mm of the original laser beam 3 is obtained.
  • a large measurement volume of the current thread 8 can be easily passed through, so that its structure can be reliably detected in the context of quality monitoring of the coiled yarn even when caused during the winding process irregularities.
  • the laser light of the two partial beams 5a and 5b impinges on the winding unit 6 on the surface of the running thread 8 and is scattered by it.
  • the laser beam 3 impinges obliquely on the partially transparent front side 12 of the wedge prism 4 at an angle ⁇ .
  • a first partial beam 5a is reflected directly on the front side 12.
  • This partial beam 5a has an intensity of approximately 5% of the intensity of the original laser beam 3.
  • the nonreflected portion of the laser beam 3 passes through the front side 12 into the wedge prism 4 and is partially reflected on the likewise partially transmissive rear side 13.
  • the portion reflected here again has an intensity of approximately 5% of the intensity of the original laser beam 3.
  • This portion reflected on the rear side 13 emerges from the wedge prism 4 as a second partial beam 5b with refraction at the front side 12.
  • the portion of the laser beam 3 which is not reflected on the rear side 13 of the wedge prism 4 emerges from the wedge prism 4 as residual beam 14 with a residual intensity of approximately 90% of the original intensity at the partially transmissive rear side 13 and does not continue to carry out the two-beam method needed.
  • the exact ray path of the two partial beams 5a and 5b is calculated according to Snell's law:
  • the rear side 13 of the wedge prism 4 is completely mirrored. Again, a first partial beam 5a with an intensity of about 5% of the intensity of the original laser beam 3 at the partially transparent front side 12 is reflected. The non-reflected portion emerges from the wedge prism 4 after reflection at the rear side 13 and subsequent refraction at the front side 12 as a second partial beam 5b with an intensity of approximately 94%.
  • the first partial beam 5a forms the reference beam, which is detected by the photodetector 9 after passing through a receiving optical system formed by an aperture 11 and a converging lens 10.
  • the second partial beam 5b forms the measuring beam which is necessary for generating the interference pattern or the beat frequency. After passing through the running thread 8, the measuring beam is no longer needed for the actual evaluation, so that it can be shielded by the aperture 11 of the photodetector 9.
  • the beam splitting takes place under multiple reflection and refraction on the wedge prism
  • a first portion 15 with an intensity of about 5% of the intensity of the original laser beam 3 is reflected on the partially transparent front side 12 and no longer needed to carry out the further process.
  • the occurred in the wedge prism 4 remaining portion of the laser beam 3 is completely reflected on the mirrored back 13 and then strikes from the inside on the partially permeable front side 12, where the largest proportion as a first partial beam
  • the first partial beam 5a forms the measurement beam or scattered beam with an intensity of approximately 90%
  • the second partial beam 5b forms the reference beam directed onto the photodetector 9 with an intensity of approximately 4%.
  • the wedge prism 4 divides the laser beam 3 respectively into two in-phase partial beams 5a and 5b, which are then brought to overlap so that they intersect in the region of the winding unit 6 on the current thread 8.
  • FIG. 4 shows a conical bobbin 20 which is driven by a drum 21 designed here as a slot drum. In this case, the drive via the lying between the inner diameter 22 and the outer diameter 23 driving diameter 24.
  • the current thread 8 is for
  • FIGS. 7a to 7d show the influences on the yarn speed profiles and yarn accelerations measured by the LDA sensor device due to changed yarn tension influences of the wound yarn 8.
  • FIGS. 7a and 7b relate to a low yarn tension, while FIGS.
  • FIGS. 7a and 7c relate to an increased yarn tension.
  • the yarn speed v is in each case over the time t
  • the yarn acceleration a is plotted over the time t.
  • Figure 8 shows the relationship between the yarn tension F and the standard deviation s of the acceleration signal of the thread 8.
  • the pressure on the disk tensioner shows the friction force of a yarn brake and thus the yarn tension F on. It can be seen that an approximately linear relationship results.
  • a wedge prism 4 does not necessarily have to be used as a part and steering device, but it is also possible, for example, to use correspondingly arranged mirror geometries with partially transparent entrance mirrors.

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Quality & Reliability (AREA)
  • Physics & Mathematics (AREA)
  • Health & Medical Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Chemical & Material Sciences (AREA)
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  • Food Science & Technology (AREA)
  • Filamentary Materials, Packages, And Safety Devices Therefor (AREA)

Abstract

L'invention concerne un procédé pour déterminer sans contact et/ou augmenter la qualité de fil d'un fil entraîné en continu (8) ou la qualité d'une bobine (20) qui est obtenue en enroulant un fil continu (8), ou pour déterminer sans contact une rupture et/ou un coincement éventuel d'un fil continu (8), au moyen d'un dispositif de capteur disposé en un endroit de bobinage (6) d'une machine textile. Un faisceau laser (3) est produit par une source de lumière (1, 2) et est divisé au moyen d'un dispositif optique de division et de direction (4) pour diviser et diriger le faisceau laser (3) en au moins deux faisceaux partiels (5a, 5b), qui sont ensuite guidés de telle sorte qu'ils soient à nouveau réunis au niveau du fil (8). La lumière réfléchie par le fil (8) est utilisée pour produire des signaux de mesure conformément au procédé d'anémométrie laser doppler, lesquels sont analysés de manière électronique pour déterminer la qualité du fil continu (8) en termes de pilosité ou pour déterminer la qualité de la bobine ou pour déterminer une rupture du fil et/ou un coincement du fil. L'invention concerne en outre un agencement qui est adapté à la mise en œuvre de ce procédé.
EP07786359A 2006-07-26 2007-07-26 Procédé et agencement pour déterminer la qualité du fil et/ou la qualité de bobine d'un fil continu à l'aide d'anémometrie laser doppler Withdrawn EP2044430A2 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102006035251A DE102006035251A1 (de) 2006-07-26 2006-07-26 Verfahren und Anordnung zur Bestimmung der Garnqualität und/oder Spulenqualität eines laufenden Fadens auf Basis der Laser-Doppler-Anemometrie
PCT/EP2007/006643 WO2008012093A2 (fr) 2006-07-26 2007-07-26 Procédé et agencement pour déterminer la qualité du fil et/ou la qualité de bobine d'un fil continu à l'aide d'anémometrie laser doppler

Publications (1)

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EP2044430A2 true EP2044430A2 (fr) 2009-04-08

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EP07786359A Withdrawn EP2044430A2 (fr) 2006-07-26 2007-07-26 Procédé et agencement pour déterminer la qualité du fil et/ou la qualité de bobine d'un fil continu à l'aide d'anémometrie laser doppler

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EP (1) EP2044430A2 (fr)
CN (1) CN101501490B (fr)
DE (1) DE102006035251A1 (fr)
WO (1) WO2008012093A2 (fr)

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DE102008019012A1 (de) 2008-04-15 2009-10-22 Ferdinand Josef Prof. Dr. Hermanns Verfahren und Anordnung zur hochgenauen Bestimmung der momentanen Aufwickelgeschwindigkeit eines laufenden Fadens
DE102009030246B3 (de) 2009-06-23 2010-12-30 Neumann Elektrotechnik Gmbh Verfahren und Anordnung zur berührungslosen Bestimmung von Fadenzugkraft-Werten
WO2011107600A1 (fr) * 2010-03-04 2011-09-09 Vienco Gmbh Procédé de détection de défauts dans un fil en circulation, mettant en oeuvre un ajustement amélioré du point de fonctionnement
JP2014024652A (ja) * 2012-07-27 2014-02-06 Murata Mach Ltd 糸巻取装置
CN104101697A (zh) * 2013-04-10 2014-10-15 苏州华觉智能科技有限公司 检测装置
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CN109987453A (zh) * 2019-04-28 2019-07-09 国网山东省电力公司诸城市供电公司 一种电缆缠绕装置
CN115592237B (zh) * 2021-07-09 2026-01-16 Ykk株式会社 线状材进给探测装置

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WO2008012093A2 (fr) 2008-01-31
CN101501490B (zh) 2013-12-04
DE102006035251A1 (de) 2008-01-31
CN101501490A (zh) 2009-08-05
WO2008012093A3 (fr) 2008-03-27

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