WO2005015202A9 - Verfahren und vorrichtung zum messen der bandmasse und/oder der bandmasseschwankungen eines laufenden faserverbandes sowie spinnereivorbereitungsmaschine mit einer messvorrichtung - Google Patents
Verfahren und vorrichtung zum messen der bandmasse und/oder der bandmasseschwankungen eines laufenden faserverbandes sowie spinnereivorbereitungsmaschine mit einer messvorrichtungInfo
- Publication number
- WO2005015202A9 WO2005015202A9 PCT/EP2004/051196 EP2004051196W WO2005015202A9 WO 2005015202 A9 WO2005015202 A9 WO 2005015202A9 EP 2004051196 W EP2004051196 W EP 2004051196W WO 2005015202 A9 WO2005015202 A9 WO 2005015202A9
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- sensor
- signals
- mass
- measuring
- sensors
- 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.)
- Ceased
Links
Classifications
-
- 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
- G01N33/362—Material before processing, e.g. bulk cotton or wool
-
- D—TEXTILES; PAPER
- D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
- D01G—PRELIMINARY TREATMENT OF FIBRES, e.g. FOR SPINNING
- D01G31/00—Warning or safety devices, e.g. automatic fault detectors, stop motions
- D01G31/006—On-line measurement and recording of process and product parameters
-
- 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
-
- 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 present invention relates to a method for measuring the sliver mass and / or the flank fluctuations of a running fiber structure, in particular on a spinning preparation machine, wherein signals from several sensors with at least partially different transmission functions are processed.
- the present invention relates to a device for measuring the strip mass and / or the strip mass fluctuations of a running fiber structure with a measuring transducer and several sensors with at least partially different transfer functions.
- a spinning preparation machine in particular a card, draw frame, comber or a multi-stage machine, with at least one measuring device for measuring the sliver mass and / or the sliver mass fluctuations of a running fiber bundle, which comprises a transmitter and several sensors with at least partially different transfer functions.
- the machine contains at least one open or closed control loop, which comprises at least one measuring device, a regulating unit and at least one drafting device for stretching a running fiber structure and is designed to compensate fluctuations in the belt mass of the fiber structure and / or a belt monitoring unit, which comprises at least one measuring device and an evaluation unit and is designed for calculating, displaying and / or storing quality data of the current fiber structure.
- a multi-stage machine is designed to carry out at least two identical or different processing steps.
- This can be, for example, a draw frame with several drafting systems or a card with a drafting system.
- Such a machine can be modular or integrated.
- the running fiber structure is mechanically scanned, for example with a feeler and grooved roller unit or a spring-loaded sensing element with a fixed counter surface. Due to the inertia of the sensing element, however, it is not possible with such devices to detect short-wave fiber band fluctuations, particularly in the case of fast-running fiber assemblies.
- the moving mass can be reduced by using a leaf spring as a feeler element, but this also leads to a reduction in the fiber pressure, as a result of which the measurement result strongly depends on further band parameters, such as fiber parallelization or bulkiness. Another disadvantage is the lower mechanical stability.
- Measuring devices with sensors without a moving mechanical probe element have a wider range, but deliver a measuring signal that depends heavily on the environmental conditions, for example the temperature or the humidity, but also on other band parameters, such as the fiber parallelization or the fiber moisture. This applies in particular to pneumatic, capacitive, optical, acoustic and radioactive sensors, but also to microwave sensors.
- a combination measuring device is known from EP 0 631 136 B1, in which the running fiber structure is examined simultaneously by a mechanical and a pneumatic sensor. It is proposed to use the signal from the pneumatic sensor for belt regulation and the signal from the mechanical sensor for belt monitoring. Furthermore, it is disclosed that by comparing the signals of these different measuring systems, other characteristics of the band, such as. B. the fiber length, the bulk, the short fiber share, the share of floating fibers and the fineness of fibers and parallel parallels can be determined. However, it is not disclosed how the bandwidth and / or the measuring accuracy of the measuring device can be improved by using measuring signals from a plurality of sensors which are based on a different measuring principle.
- the object is achieved by a method, a measuring device and a spinning preparation machine with the features of the independent claims.
- the method according to the invention for measuring the strip mass and / or the strip mass fluctuations of a running fiber structure which consists of a single strip or of a combination of several strips signals from several sensors with at least partially different detection behavior are processed.
- Sensors in particular if they work according to a different measuring principle, differ among other things in the extent to which they are able to record measured variables that change quickly over time.
- the dynamics of a sensor can be characterized by its transfer function. This describes the amplitude and the phase position of the output signal as a function of the frequency of an input signal.
- the sliver mass and / or the sliver mass fluctuation of a running fiber structure is a measurement variable which, depending on the running speed of the fiber structure, can change very quickly over time. It is therefore advisable to use several sensors with different dynamics or transfer functions to record this measured variable.
- at least one defined frequency range is filtered out of the frequencies contained in the measurement signals of at least one sensor for further processing, and the band mass fluctuations of a wavelength range corresponding to the frequency range are determined.
- the signals obtained by the filtering are used in the processing of signals from at least one further sensor.
- “Use in the processing of signals” should be understood to mean any influence on the parameters or on the use of the signals to be processed in each case. Filtering can exclude signal components that are not required for further processing and which may even be disruptive from further processing. This can be, for example, signal components that result from resonance effects. It is also possible to suppress frequency ranges in which the sensor has an unfavorable interference / useful signal ratio. All in all, the filtering provides a signal which maps the band-mass fluctuations of the relevant frequency and thus wavelength range with great accuracy. The signal is therefore ideally suited as a reference signal for other sensors, but also as a partial signal for recording the entire fluctuations in the strip mass.
- the limitation of the frequency range enables a sensor to be optimized in such a way that it works with great accuracy precisely in the relevant frequency range.
- essential parameters such as, for example, the moving mass or the pressing force on the fiber band.
- Band mass fluctuations of other wavelength ranges can be determined with one or more additional sensors. If necessary, the signals from the other sensors can also be filtered. As a result, the method allows a broadband detection of the band mass fluctuations or the band mass, with high measuring accuracy in the entire frequency range.
- the signals of a sensor are filtered so that the respective sensor transmits one in this frequency range! ngs function with constant gain or amplitude response. In this way, an output signal is obtained in which the amplitude is independent of the frequency of the input signal, provided that only this frequency is because the frequency range is included. If the sensor has a constant phase response in this frequency range, the further processing of the signals is simplified.
- the frequency range to be recorded is preferably divided into a number of adjacent intervals.
- a specific sensor can be assigned to each interval, and the assignment between the interval and the sensor can be based on the transmission behavior of the respective sensor.
- the respective sensor preferably has a constant amplitude transfer function in the respective interval.
- the frequency range that corresponds to the interval assigned to it can now be filtered out from the signals of the respective sensor.
- the filtered signals from a plurality of sensors can then be combined, so that an overall signal is obtained which represents the frequency range of interest as a whole.
- the combination of two signals can be understood to mean the formation of a new signal which comprises at least parts of both original signals. For example, signals can be added.
- At least a high pass, a low pass, a band pass and / or a band stop can be used to filter the measurement signals. It is irrelevant here whether the filters are designed in analog or digital technology, since the necessary A / D and / or D / A converters are available at low cost and are technically sophisticated.
- the signals are filtered in such a way that they can be used directly to regulate a work process, such as, for example, the drawing of a sliver in a drafting system.
- the signals can also be filtered in such a way that they are immediately suitable for recording certain quality data of the fiber structure. By filtering through a low-pass filter, for example, the strip weight averaged over a longer strip section can be determined directly.
- data for the calibration of a further sensor and / or for the correction of the measurement errors of a further sensor are obtained from the filtered signals of a sensor. Calibration is understood in particular to mean the adaptation of the sensor characteristic to a reference characteristic. These characteristics describe the relationship between the input signal and the output signal of a sensor.
- the sensor can be calibrated by adding a constant value (offset) to the output signal of the sensor.
- the sensor can be calibrated by varying the gain.
- the calibration can take place on the sensor itself or in a downstream processing unit, for example in a measuring transducer or measuring transducer. In the case of non-linear characteristic curves, calibration can also be carried out at intervals.
- the calibration can relate, for example, to the zero point and / or to the gain of a sensor.
- the measurement signals of a sensor working according to a mechanical principle are used for calibration and / or for correcting the measurement errors of a sensor working according to another measurement principle, which preferably has a highly dynamic behavior - be.
- a mechanical sensor is preferred here, which works according to the tactile and grooved roller principle. This results from the fact that such a sensor, at least in the low-frequency range, has very precise delivers solute values and is also particularly insensitive to external influences, such as temperature, humidity or band structure.
- the measurement error correction can relate to random and / or systematic measurement errors.
- the measurement signals of the sensor working according to a mechanical principle can also be used advantageously to substitute unusually deviating measurement signals from the further sensor operating according to a different measuring principle.
- a sensor operating on a different mechanical principle, a pneumatic, a capacitive, an optical, an acoustic, a radioactive sensor or a microwave sensor can be used as a further sensor.
- the filtered signals of at least two sensors are combined for the purpose of regulating a work process and / or for recording quality data of the fiber structure. This enables the advantages of different measuring principles to be combined.
- phase difference which is caused, for example, by the time difference between the measurement at a specific point in the current fiber structure with one sensor and the measurement of the same location in the fiber structure with another sensor, or by the phase changes of the sensors, transducers used, Filters and / or other elements of the arrangement can arise. If the phase difference is different at different frequencies, this can be corrected in relation to frequency.
- the phase difference can be compensated for, for example, with an all-pass, preferably with an all-pass with a controllable phase shift or an intermediate store. With a buffer, the first-in / first-out principle can be applied.
- the measurement value of a certain number of measurement values that has been in memory for the longest time is output for further processing and deleted in the memory.
- the storage and removal process can be cycled depending on the running speed of the fiber structure. In this way it can be ensured that such measured values are combined which relate to the same place on the running fiber structure.
- a narrow-band in particular a mechanical sensor
- a broad-band in particular a mechanical sensor with less moving mass than the first sensor
- a pneumatic, a capacitive, an optical, an acoustic, a radioactive sensor or a microwave sensor is used.
- narrowband sensor can be understood to mean a highly dynamic sensor which is suitable for detecting high-frequency fluctuations in the band mass.
- a narrowband sensor is a low-dynamic sensor which lacks this property.
- the transmitter has at least one low pass, one high pass, one blocking pass and / or one band pass for filtering the measurement signals.
- the transmitter can be designed in an analog, digital or a mixed version.
- the measuring former has means for calibrating at least one sensor, for evaluating, for phase correction, for measuring error correction, for combining and / or for forwarding the filtered measurement signals of the at least two sensors.
- the transmitter can have a phase shifter, in particular an all-pass, for phase correction of the filtered measurement signals from various sensors. This is particularly useful if the filtered measurement signals are combined further.
- the transmitter has a computer, in particular a microprocessor. This is preferably designed for calibrating at least one sensor, for evaluating, for phase correction, for measuring error correction, for combining and / or for forwarding the measurement signals.
- the transmitter filters out the measurement signals of a first sensor for detecting the long-wave band mass fluctuations and the measurement signals of a second sensor for detecting the short-wave or the short- and long-wave band mass fluctuations.
- the first sensor is a narrowband sensor and the second sensor is a broadband.
- a mechanical sensor can be present in the sensor.
- the second sensor can in particular be a mechanical sensor with a smaller moving mass than the first sensor, a pneumatic, a capacitive, an optical, an acoustic, a radioactive sensor or a microwave sensor.
- a spinning preparation machine according to the invention has at least one measuring device of the type described here in order to achieve the advantages according to the invention.
- At least one measuring device can be arranged to measure the sliver mass and / or the sliver mass fluctuations of the incoming fiber structure at the entrance of the spinning preparation machine or at the entrance of a processing stage of the spinning preparation machine.
- At least one measuring device for measuring the sliver mass and / or the sliver mass fluctuations of the emerging fiber structure can also be arranged at the exit of the spinning preparation machine or at the exit of a processing stage of the spinning preparation machine.
- At least one measuring device is arranged at the input of the spinning preparation machine or at the input of a processing stage of the spinning preparation machine and at least one measuring device is arranged at the output of the spinning preparation machine or at the output of a processing stage of the spinning preparation machine.
- the spinning preparation machine for feeding back or feeding signals forward from a measuring device (3 or 1) for the purposes of processing, in particular when regulating the gain, signals from at least one sensor of an upstream or downstream of the spinning preparation process Measuring device (1 or 3) is formed in at least one frequency range.
- FIG. 1 shows an overall view of a spinning preparation machine according to the invention
- FIG. 2 shows an exemplary embodiment for a measuring device according to the invention
- FIG. 3-5 further exemplary embodiments of a measuring device according to the invention.
- Figure 8 shows an example of different frequency responses of two sensors
- FIG. 1 shows a route as an inventive embodiment of a spinning preparation machine.
- a fiber structure FV which consists of a single band or a combination of several bands, runs through the route in the direction of the arrow LR.
- the incoming fiber structure FVein passes through the measuring device 1 for recording the strip mass and / or the strip mass fluctuations.
- the fiber structure FV is presented to the drafting unit 2, which consists of the pair of input rollers 21, the middle pair of rollers 22 and the delivery roller: pair 23. Due to the different peripheral speeds of the pairs of rollers, the sliver FV, z. B. warped by a factor of 6.
- the delivery roller pair 23 generally has a constant speed, so that the stretching process is regulated by influencing the speed of the other two roller pairs.
- the outgoing fiber structure FV from passes the measurement direction 3 and is placed in a can 4 by means of a tape guide means 41.
- the measuring device 1 for the incoming fiber structure FV e j n has a first sensor 11, which is designed here as a touch-groove roller system.
- a sensor has an essentially time-invariant transfer function and is largely insensitive to external interference.
- due to the inertia of the portable probe element such a sensor is not able to reproduce high-frequency changes in the measurement variable.
- a touch-and-groove roller system can be understood as a sensor with high accuracy but limited bandwidth.
- the measuring device 1 has a second sensor 12.
- the sensor 12 can in particular be designed as a pneumatic, capacitive, optical, acoustic, radioactive sensor or as a microwave sensor.
- a mechanical sensor with a low moving mass for example a sensor with a leaf spring, is also possible.
- the transfer function of the second sensor 12, for the purpose of detecting the high-frequency fluctuations in the band mass is broadband than the transfer function of the first sensor 11.
- the measurement signals from sensors 11, 12 are fed to transducer 10 via transducers 110, 120.
- the measuring transducers 110, 120 essentially have the task of converting the measuring signals into an electrical variable.
- the transmitter 10 primarily generates control data SD1 from the measurement signals from the sensors 11, 12, which are fed to the regulating unit 5.
- the regulating unit 5 is designed to influence the peripheral speed of the input roller pair 21 and the middle roller pair 22.
- the measuring device 1, the regulating unit 5 and the drafting device 2 thus form an open control loop, also called a control unit, for regulation the stretching of the running fiber structure FV. If, for example, the measuring device 1 detects a thick spot in the running fiber structure, that is to say a fluctuation in the sliver mass, corresponding control data SD1 are transmitted to the regulating unit 5.
- the pair of input rollers 21 and the middle pair of rollers 22 are braked, thus increasing the speed difference with respect to the pair of delivery rollers 23.
- the sliver is stretched relatively more and the thick point is dissolved.
- the transmitter 10 can be designed to obtain quality data of the incoming fiber structure FV e in. This can be useful, for example, if the upstream spinning preparation machine, for example a comber, does not have a means for checking the quality of the fiber bundle that is running out. In this case, the quality data QD2 are transmitted to an evaluation unit 6 described in more detail below.
- the measuring device 3 is constructed similarly to the measurement device 1. It comprises a narrow-band sensor 31 and a wide-band sensor 32.
- the signals from the two sensors are fed to the measuring transducer 30 via measuring transducers 310, 320.
- the transmitter 30 primarily generates quality data QD1 from the measurement signals, which relate to the fiber bundle FV that is coming out and is transmitted to the evaluation unit 6.
- the evaluation unit 6 is designed for the calculation, display and / or storage of quality data of the fiber bundle FVaus that is running out.
- the transmitter 30 may generate data SD2 from the measurement signals from the sensors 31, 32 for regulating the stretching process. These data SD2 are then fed to the regulating unit 5 and can then be used as the basis for regulating the peripheral speed the roller pairs 21, 22 are used.
- the measuring device 3, the regulating unit 5 and the drafting device 2 thus form a closed control loop for regulating the drawing process.
- the closed control loop is not suitable for controlling short-wave disturbances of the belt mass, since the disturbance is only detected when it has already left the regulating drafting device. However, the measuring device 3 detects z. If, for example, the mean value of the strip mass increases, control data SD2 are generated and transmitted to the regulating unit 5, which then reduces the speed of the roller pairs 21, 22.
- the regulating unit 5 is expediently designed such that the data SD1 of the open control loop and the data SD2 of the closed control loop can be processed simultaneously.
- FIG. 2 shows a measuring device 1 according to the invention with a downstream regulating unit 5 and evaluation unit 6.
- the measuring device has a narrow-band sensor 11, a broad-band sensor 12 each with an associated transmitter 110, 120.
- the measurement signals of the first sensor 11 are filtered by a low-pass filter 17, so that a signal x tp2 is generated and fed to the microprocessor 14.
- the signals of the broadband sensor 12 are filtered via a low pass 16, a signal X t p ⁇ being generated and fed to the microprocessor 14.
- the low passes 16, 17 have a similar pass characteristic.
- the pass characteristic is determined in such a way that the pass range lies in the working range of both sensors 11, 12.
- signals xt p ⁇ and x tP2 which can be sensibly compared with regard to the amplitude.
- the microprocessor 14 can now determine a deviation in the gain factor, also called the proportionality factor, by comparison.
- An actuating signal z v for regulating the amplifier 13 can now be determined from this.
- a constant gain can thus be assigned to the subsystem consisting of the broadband sensor 12, the transducer 120 and the amplifier 13.
- the output signal x v of the amplifier 13 is thus in the amplitude de independent of a systematic amplitude error of the sensor 12. In particular, measurement errors caused by band parameters are corrected.
- the broadband sensor 12 is based on an optical measurement principle, the measurement error which is generated by a change in the color of the fiber structure FV is corrected.
- the output signal x v of the amplifier 13 thus contains precise and broadband information about the tape mass or the fluctuation of the tape mass of the fiber structure FV and can easily be converted into a control signal SD1 by the microprocessor 14 and passed on to the regulating unit 5.
- the output ⁇ gnal x hP of a high pass 15 and the output signal xt 2 of the low pass 17 are used.
- the signals from the second sensor 12 are filtered by the high pass 15.
- the high pass 15 and the low pass 17 preferably have the same cutoff frequency, so that the data stream QD2 contains a broadband image of the fluctuations in the band mass of the fiber structure FV.
- the output signal of the amplifier x v could also be used to generate the quality data QD2.
- the evaluation unit 6 can now determine common parameters of the fiber structure, such as the strip weight deviation A%, the variation coefficient CV or a variation coefficient CV än e. It is also possible to determine several CV length variation coefficients which relate to different lengths of the fiber structure. Spectral analysis can also be carried out.
- FIG. 3 shows a further embodiment of a measuring device 1 according to the invention.
- the signals of the narrowband sensor 11 are via a low pass 17 and one here Phase shifters designed as an all-pass 19 are fed to a summer 25. Furthermore, the measurement signals of the broadband sensor 12 are fed to the same summer 25 via a high pass 15 and an amplifier 13.
- the output signal x s of the adder 25 is an accurate and broadband image of the band mass fluctuations of the fiber structure FV, provided the cut-off frequency of the high-pass filter 15 and the cut-off frequency of the low-pass filter 17 correspond to one another. In other words, the signals above the cutoff frequency are transmitted through the high pass 15 and the signals below the cutoff frequency through the low pass 17.
- the signal of the sensor 11 a bandpass 18 and its output signal X b p supplied to the microprocessor 14.
- the pass band of the bandpass 18 is advantageously above the cut-off frequency of the high pass 15.
- the IVlikroprocessor 14 now evaluates the output signal x P of the bandpass and the output signal x v of the amplifier 13 and thus calculates a control signal z v for regulating the gain factor of the Amplifier 13.
- the low-pass filtered signals from the narrowband sensor 11 could also be routed via a regulated amplifier 13.
- the measurement signal of the sensor measuring first, here of the narrowband sensor 11 is implemented via an allpass 19 here Phase shifter led.
- the all-pass 19 essentially has the task of forwarding the signals with a time delay but with the same amplitude and is designed to be controllable with respect to the phase shift.
- the low-pass filter 17 connected upstream of the phase shifter also causes a delayed phase shift, but this cannot be regulated.
- the frequency-dependent phase delay of the all-pass is controlled by a signal z a from the microprocessor 14.
- the signal z a is generated, for example, from a comparative analysis or Correlation of the signals xt p and x v .
- a buffer not shown, which works for example according to the first-in / first-out principle, could also be used for the controlled phase correction.
- the control data SD1 which are supplied to the regulating unit 5, can essentially be calculated from the output signal x s of the summer 25.
- the quality data QD2 which are fed to the evaluation unit 6, can be generated from the output signal X t P of the low-pass filter 17 and from the output signal x v of the amplifier 13.
- x can tp the weight deviation band A% and x v, the variation coefficient CV or the interest Variati- onskostoryen from the signal are determined CV Len ge in a simple manner from the signal.
- the signal x s is a signal which contains broadband and precisely information about the band mass and / or the band mass fluctuations of the fiber structure FV.
- the signal x s can also be used to carry out a spectral analysis.
- Such a measuring device 1 can preferably be used at the input of a spinning preparation machine, but in principle alternatively or additionally also at the output of the same. It is characteristic of the exemplary embodiment described that both the advantages of a narrowband sensor 11 and the advantages of a broadband sensor 12 are optimally combined.
- the measuring device 1 shown in FIG. 4 also has a broadband sensor 12 and a narrowband sensor 11. Regarding the running direction LR of the fiber assembly FV, however, the sensors are spatially interchanged, ie a certain point of the fiber assembly FV first passes through the broadband sensor 12, then the narrowband sensor 11. This sensor arrangement is preferred if it is based on precise guidance. tion of the fiber assembly leaving the measuring device 1 and FV arrives.
- the structure, mode of operation and purpose of the transmitter 10 essentially correspond to the exemplary embodiment described above. However, due to the changed sensor arrangement, the allpass 19 is arranged here between the amplifier 13 and the summer 25. This means that the signals of the broadband sensor 12 are delayed before the summation with the signals of the narrowband sensor 11.
- a buffer not shown, which works for example according to the first-in / first-out principle, could also be used for the controlled phase correction.
- the buffer can be used, for example, for phase correction, which is necessary due to the spatial separation of the sensors 11, 12, and the all-pass for correcting the phase shift, which is brought about by the filters or other elements of the arrangement.
- the control data SD1 and the quality data QD2 can be calculated and forwarded in the same way as in the exemplary embodiment according to FIG. 3.
- the measuring device 1 shown can preferably be used at the input of a spinning preparation machine. However, it is generally possible to arrange them alternatively or additionally at the exit of such a machine.
- FIG. 5 shows a simplified measuring device 3 according to the invention, which supplies quality data QD1 to an evaluation unit 6.
- a measuring device 3 is advantageously arranged at the output of a spinning preparation machine that works without a closed control loop.
- the measuring device 3 has a narrowband sensor 31 and a broadband sensor 32 as well as corresponding measuring transducers 310 and 320.
- the fiber structure FV aU s first passes through the narrowband sensor 31, then the broadband sensor 32.
- the arrangement of the sensors 31, 32 can be interchanged with respect to the running direction. This is particularly useful if the broadband sensor for compressing and solidifying the fiber structure FV is made funnel-shaped. be used.
- the control data SD1 and the quality data QD2 can be calculated and forwarded in the same way as in the exemplary embodiment according to FIG. 3.
- the measuring device 1 shown can preferably be used at the entrance to a spinning preparation machine. However, it is generally possible to arrange them alternatively or additionally at the exit of such a machine.
- FIG. 5 shows a simplified measuring device 3 according to the invention, which supplies quality data QD1 to an evaluation unit 6.
- a measuring device 3 is advantageously arranged at the output of a spinning preparation machine that works without a closed control loop.
- the measuring device 3 has a narrowband sensor 31 and a broadband sensor 32 as well as corresponding measuring transducers 310 and 320.
- the fiber structure FV passes from the first narrowband ended sensor 31, then the wide band sensor 32.
- the arrangement of the sensors 31, 32 are reversed with respect to the running direction. This is particularly useful if the broadband sensor for compressing and solidifying the fiber structure F ⁇ sus is funnel-shaped.
- the signals from the two sensors 31, 32 are fed to the transmitter 30.
- the signals from the narrowband sensor 31 are fed to the microprocessor 34 via a low pass 37.
- the signals from the broadband sensor 32 are also fed to the microprocessor 34 via a high pass 35 and an amplifier 33.
- the amplifier 33 is regulated via an actuating signal z v , which is generated by the microprocessor 34 on the basis of the band-pass filtered signals from the narrowband sensor 31. This ensures that the signals y v and y tp fed to the microprocessor 34 have a comparable amplitude. From this, the microprocessor 34 can determine the quality data QD1. These can then be fed to the evaluation unit 6.
- FIG. 6 shows a sensor arrangement with double mechanical scanning.
- the running fiber structure FV first passes through a narrow-band sensor 11, which is designed here as a touch-groove roller unit.
- the fiber structure FV then passes through a broadband sensor 12, which is also designed as a mechanical sensor with a movable sensing element 124.
- the scanning element 124 is designed as a sliding plate and is pressed against the running sliver by a spring.
- the moving mass can be much smaller than with a touch-and-groove roller unit. This results in a higher bandwidth of the sensor 12.
- a vertical movement of the key element 124 is a measure of a fluctuation in the tape mass of the fiber structure FV and can be recorded by any displacement sensor 125. If the sensor arrangement shown is part of a measuring device or machine according to the invention, there are all the advantages already described.
- FIG. 7 shows a preferred embodiment of a double mechanical scanning sensor arrangement.
- Sensor 12 is designed as a mechanical sensor with sensing element 224.
- the contact pressure of the running fiber structure FV is a measure of the strip mass or the strip mass fluctuation.
- the contact pressure causes an elastic deformation of the feeler element 224.
- This elastic deformation can be measured, for example, by a piezoelectric sensor 225.
- the sensor 12 is very broadband.
- Such a mechanical double scanning can advantageously be used in a measuring device or machine according to the invention.
- the sensors 11, 12 can also be arranged in a different order with respect to the running direction of the fiber structure FV. This can result in advantages with regard to the mechanical guidance of the fiber structure FV.
- FIG. 8 shows an example for different frequency responses of two sensors.
- the frequency response is the amplitude-related part of the transmission function.
- the frequency responses shown relate to sensor combinations 11 and 12 or 31 and 32 of the exemplary embodiments described above.
- the frequency f is plotted on the abscissa on a logarithmic scale from 3 to 100 Hertz.
- the ordinate - also on a logarithmic scale - shows the relative amplitude of the respective sensor signal in relation to a standard value K as a function of the frequency f.
- Curve An (f) shows the frequency response of a narrowband sensor (see sensors 11, 31 in FIGS. 1-7) and curve A ⁇ 2 (f) shows the frequency response of a broadband sensor (see sensors 12, 32 in FIGS. 1-7) ).
- the dimension of the factor K corresponds to the dimension of the output signals of the transducers 110 or 310 and 120 or 320.
- the numerical value of K describes a setpoint.
- a mechanical sensor 11 or 31 with a movable probe element approximately has a PT 2 transmission behavior.
- the curve An (f) shows such a frequency response as an example.
- the sensor 11 or 31 has an almost constant gain.
- the amplitude first shows a resonance increase and then a steady decrease of about 40 dB per decade.
- the resonance increase depends on a damping constant of the respective sensor and decreases or even disappears with stronger damping.
- Broadband sensors 12 and 32 often have a P-Ti transmission behavior.
- the curve A- ⁇ 2 (f) which is an example of this, has an almost constant amplification at frequencies below approximately 30 Hz. However, the amplitude is 10 dB above the setpoint. This amplitude deviation is dependent on disturbance variables and can be changed over time. For higher frequencies there is a drop in ampacity of 20 dB per decade. If sensors with such frequency responses are used in combination, the frequency range of 0 to 30 Hz that is of interest, for example, can be divided into intervals 1 and 2.
- the narrowband sensor 11 and 31 has an essentially constant gain in the interval 1, while the broadband sensor 12 and 32 shows this property in both intervals.
- signal sections in the area of the interval 1 can be obtained by filtering, for example with a bandpass. These signal sections are free from disturbing resonance and amplitude drop effects.
- the amplitude difference of the signal sections for gain regulation for the broadband sensor 12; 32 can be used.
- curve A ⁇ 2 (f) is corrected by -10 dB.
- a signal which represents the entire measuring range from 0 to 30 Hz can be obtained, for example, by interval 1 from the signals of the narrowband sensor 11 or 31 and interval 2 from the amplitude-corrected signals from the broadband sensor 12 or 32 is filtered out and these two filtered signals are combined.
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- Engineering & Computer Science (AREA)
- Textile Engineering (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Mechanical Engineering (AREA)
- Analytical Chemistry (AREA)
- Physics & Mathematics (AREA)
- Medicinal Chemistry (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
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- Food Science & Technology (AREA)
- Spinning Or Twisting Of Yarns (AREA)
Abstract
Description
Claims
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| EP04741859A EP1651954A1 (de) | 2003-08-06 | 2004-06-22 | Verfahren und vorrichtung zum messen der badmasse und/oder der bandmasse-schwankungen eines laufenden faserverbandes sowie spinnereivorberetunggsmaschine mit einer messvorrichtung |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE2003135856 DE10335856A1 (de) | 2003-08-06 | 2003-08-06 | Verfahren und Vorrichtung zum Messen der Bandmasse und/oder der Bandmasseschwankungen eines laufenden Faserverbandes sowie Spinnereivorbereitungsmaschine mit einer Messvorrichtung |
| DE10335856.0 | 2003-08-06 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| WO2005015202A1 WO2005015202A1 (de) | 2005-02-17 |
| WO2005015202A9 true WO2005015202A9 (de) | 2005-10-20 |
Family
ID=34111940
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| PCT/EP2004/051196 Ceased WO2005015202A1 (de) | 2003-08-06 | 2004-06-22 | Verfahren und vorrichtung zum messen der bandmasse und/oder der bandmasseschwankungen eines laufenden faserverbandes sowie spinnereivorbereitungsmaschine mit einer messvorrichtung |
Country Status (4)
| Country | Link |
|---|---|
| EP (1) | EP1651954A1 (de) |
| CN (1) | CN1833166A (de) |
| DE (1) | DE10335856A1 (de) |
| WO (1) | WO2005015202A1 (de) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102995193B (zh) * | 2012-11-13 | 2016-01-13 | 天津工业大学 | 一种细纱断头检测方法及应用该方法的细纱断头检测装置 |
Family Cites Families (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DD215516A1 (de) * | 1983-04-27 | 1984-11-14 | Spinnerei Karl Marx Veb | Verfahren und anordnung zum ueberwachen der gleichmaessigkeit der verteilung von verschiedenen fasern in duennem oder fadenfoermigem gut |
| DD243518A1 (de) * | 1985-12-18 | 1987-03-04 | Karl Marx Stadt Tech Hochschul | Anordnung zur signalbeeinflussung in optoelektronischen mess- und ueberwachungsgeraeten, vorzugsweise fuer textile flaechengebilde, faeden und arbeitselemente an textilmaschinen |
| CH678172A5 (de) * | 1989-06-07 | 1991-08-15 | Zellweger Uster Ag | |
| US5289381A (en) * | 1989-12-04 | 1994-02-22 | Maschinenfabrik Rieter Ag | Method and apparatus for continuously determining the fineness of fibers in slivers |
| DE59107714D1 (de) * | 1990-09-26 | 1996-05-30 | Rieter Ag Maschf | Verfahren zur Korrektur eines ermittelten Messsignals zur Masse eines Faserbandes an einem Regulierstreckwerk für Faserbänder mit einem Auslaufmessorgan |
| CH683035A5 (de) * | 1992-01-31 | 1993-12-31 | Loepfe Ag Geb | Verfahren und Vorrichtung zur Detektion von Verunreinigungen, insbesondere Fremdfasern in langgestreckten, textilen Gebilden. |
| CH686446A5 (de) * | 1993-01-13 | 1996-03-29 | Luwa Ag Zellweger | Verfahren und Vorrichtung zur On-line Qualitaetsueberwachung im Spinnereivorwerk. |
| CH685506A5 (de) * | 1993-06-23 | 1995-07-31 | Zellweger Uster Ag | Vorrichtung zur Messung der Masse oder des Substanzquerschnitts von Faserbändern und Verwendung der Vorrichtung. |
| WO1996027126A1 (de) * | 1995-02-28 | 1996-09-06 | Rhone-Poulenc Viscosuisse S.A. | Verfahren und vorrichtung zur bestimmung von strukturfehlern an laufenden textilen flächengebilden |
| DE19538496A1 (de) * | 1995-08-08 | 1997-02-13 | Rieter Ingolstadt Spinnerei | Lineare Messung der Faserbanddicke oder -masse |
| US5943740A (en) * | 1996-04-02 | 1999-08-31 | Rieter Machine Works, Ltd. | Combing machine with an autoleveller drafting arrangement |
| CN100425989C (zh) * | 2000-05-31 | 2008-10-15 | 乌斯特技术股份公司 | 识别在纵向移动的纱线状产品中的杂质的方法及装置 |
| US7103440B2 (en) * | 2001-12-11 | 2006-09-05 | Rieter Ingolstadt Spinnereimaschinenbau Ag | Use of microwaves for sensors in the spinning industry |
-
2003
- 2003-08-06 DE DE2003135856 patent/DE10335856A1/de not_active Ceased
-
2004
- 2004-06-22 EP EP04741859A patent/EP1651954A1/de not_active Withdrawn
- 2004-06-22 CN CNA2004800225137A patent/CN1833166A/zh active Pending
- 2004-06-22 WO PCT/EP2004/051196 patent/WO2005015202A1/de not_active Ceased
Also Published As
| Publication number | Publication date |
|---|---|
| WO2005015202A1 (de) | 2005-02-17 |
| EP1651954A1 (de) | 2006-05-03 |
| DE10335856A1 (de) | 2005-03-03 |
| CN1833166A (zh) | 2006-09-13 |
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