WO2008092285A1 - Capteur à ondes centimétriques - Google Patents

Capteur à ondes centimétriques Download PDF

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Publication number
WO2008092285A1
WO2008092285A1 PCT/CH2007/000630 CH2007000630W WO2008092285A1 WO 2008092285 A1 WO2008092285 A1 WO 2008092285A1 CH 2007000630 W CH2007000630 W CH 2007000630W WO 2008092285 A1 WO2008092285 A1 WO 2008092285A1
Authority
WO
WIPO (PCT)
Prior art keywords
machine
fiber
wave sensor
flakes
mass flow
Prior art date
Application number
PCT/CH2007/000630
Other languages
German (de)
English (en)
Inventor
Kurt Waschnigg
Gerhard Gschliesser
Original Assignee
Maschinenfabrik Rieter Ag
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 Maschinenfabrik Rieter Ag filed Critical Maschinenfabrik Rieter Ag
Publication of WO2008092285A1 publication Critical patent/WO2008092285A1/fr

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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
    • 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
    • D01G—PRELIMINARY TREATMENT OF FIBRES, e.g. FOR SPINNING
    • D01G7/00—Breaking or opening fibre bales
    • D—TEXTILES; PAPER
    • D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
    • D01G—PRELIMINARY TREATMENT OF FIBRES, e.g. FOR SPINNING
    • D01G7/00—Breaking or opening fibre bales
    • D01G7/06—Details of apparatus or machines
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
    • G01F1/00—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow
    • G01F1/66—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow by measuring frequency, phase shift or propagation time of electromagnetic or other waves, e.g. using ultrasonic flowmeters
    • G01F1/663—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow by measuring frequency, phase shift or propagation time of electromagnetic or other waves, e.g. using ultrasonic flowmeters by measuring Doppler frequency shift
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N22/00—Investigating or analysing materials by the use of microwaves or radio waves, i.e. electromagnetic waves with a wavelength of one millimetre or more

Definitions

  • the invention relates to a device and the associated method for determining a mass of a fiber fluff stream.
  • the invention also relates to a control of a blowroom or a spinning preparation machine under the application of the method or. the apparatus for determining a mass of a fiber fluff stream.
  • a mass flow is to be understood as meaning a quantity per time, for example in kilograms per hour.
  • DE 10 2004 030 967 A1 discloses a determination of the mass flow of fiber flakes of cotton with the aid of a microwave resonator.
  • DE 197 05 260 A1 uses the same device for the determination of moisture and mass flow of cut tobacco in cigarette production.
  • DE 197 05 260 A1 describes a method for detecting at least one property of a substance by evaluating the detuning caused by the presence of the substance of a high-frequency (RF) resonator to which microwaves are supplied and of which a high-frequency signal influenced by the substance is removed, the resonance frequency shift and damping against a substance uninfluenced by the signal is detected.
  • RF radio frequency
  • One possible property is the density of the material measured in this way to calculate the mass flow.
  • a disadvantage of this method is that at least two different frequencies must be supplied to the microwave resonator and a resonator can only be installed in the conveying part of the machine as an additional channel part. This makes it difficult to retrofit existing systems, because often the space left no room for additional installations.
  • Another method for measuring cotton pulp streams is disclosed in document CH 680 296 A5.
  • a device which provides in a channel part of the conveyor line a number of light emitters and light receivers.
  • the light emitters send light rays to the light receivers, which emit them on the opposite to the opposite side of the channel.
  • a shadow effect occurs, which generate the transported fiber flakes on the chain of light receivers.
  • the number of light receivers that receive no light is a measure of the amount of flake material present.
  • a disadvantage of this measurement method is that the accuracy of the density of the light emitter and light receiver is dependent, the number of light emitter and light receiver is limited due to the particular installation situation.
  • Another disadvantage is the monitoring of the measuring device. Since a failure of a light transmitter does not cause the failure of the measuring device but a measuring error, complex control of all light elements is necessary.
  • a third way of measuring the amount of fiber fluff flow in flight is disclosed in CH 680 736 A5.
  • the fiber flake stream impinges on a baffle element.
  • the load or Wegauslenkung this baffle is registered and measured. From the impulse force measured in the event of a collision of a fiber floc, it is possible to calculate the amount or mass of the fiber floc stream after subtracting the velocity component.
  • a disadvantage of this measurement method is that the influence of the transport medium must be taken into account and additionally the speed of the fiber flakes must be known.
  • the invention is based on the object to provide a measuring device for determining the mass flow of Faserflockenströmungen which overcomes the disadvantages of the prior art and can be easily and inexpensively implemented in their structure and retrofitted in existing facilities with fiber flakes transports. Another object of the invention is to improve the measurement accuracy over the known methods.
  • the object is achieved by using a centimeter wave sensor for measuring properties of the fiber flakes to measure a mass of a fiber flake stream and by providing suitable means for determining the mass flow from the measured properties of the fiber flakes.
  • a centimeter wave sensor is a high sensitivity radar device.
  • radar Radio Detection and Ranging
  • CW radar continuous wave radar
  • the suitable CW radar systems operate with a frequency between 2 GHz and 20 GHz, which corresponds to a wavelength of 1.7 to 15 cm, with a frequency band between 8 and 12 GHz has proven to be particularly suitable.
  • the functional principle is explained in detail under FIG. 1 and is also known under the name of radio wave measurement technology.
  • centimeter wave sensor can be carried out at any location in the flow of the flakes. There are no internals in the conveyor channel itself.
  • the sensor is attached to a wall of the channel such that the radiated radio waves can outshine the entire cross section of the channel. It is particularly advantageous that the centimeter wave sensor can be attached to only one side of the channel, since the transmitting device simultaneously represents the receiving device.
  • the radio waves emitted by the sensor are reflected on the surface of a flake. This reflection is dependent on the surface structure and shape of the surface (flat, curved) and can be generally referred to as echo.
  • the term detection is generally used for the process of transmitting and receiving the radio waves resp. of the echo.
  • the shape and nature of the flakes falling by or passing by can be determined. From these data, the big results.
  • the movements Measurements of flakes measured it can be distinguished in speed and direction of movement.
  • Suitable means for example evaluation units, are used to determine the mass flow from the measured properties of the flakes.
  • Material-specific conversion factors such as statistically determined density values or mass conversion data are stored in the evaluation devices, with the help of which the relationship between the measured properties and the resulting mass flow can be established. This function can be taken over by an evaluation unit or integrated in a central control of the machine or system. With the aid of this stored data, the mass flow of the flakes passing by the device can be determined.
  • the speed of the flakes with which they pass the centimeter-wave sensor is less than 25 meters per second, preferably the speed is in a range of 8 to 15 meters per second.
  • the installation position of the centimeter wave sensor and the type of conveyance of the flakes and the achieved processing stage need not be taken into account, which represents a further advantage of the measuring method according to the invention.
  • centimeter wave sensors are used to measure fiber flake flows on fiber flake processing machines of a spinning preparation plant.
  • the measurement can be installed in each Faserflockentransport, even an arrangement within a machine is conceivable.
  • Fiber flake flows are very difficult to measure because the flakes differ greatly in size and shape.
  • it is possible, for example at the outlet or within a bale-removing machine, to measure the fiber-flock flow with a high degree of accuracy.
  • the accuracy of the measurement depends, among other things, on the size of the fiber flakes. For a good functionality of most processes in spinning processing plants a sufficient accuracy is given even with a small fiber flake size.
  • the fiber flake stream can be measured, for example, in a Ballenabtragmaschine shortly after its formation within the Abtragarmes or the Abtragturmes. As a result, a subsequent setpoint-actual comparison can be better controlled by means of a short control path.
  • bale stripper If a setpoint value for production is given to the bale stripper, an instantaneous actual value of the fiber flake stream can be determined with the aid of the device for determining the mass of the fiber flake stream, and a regulation of the removal rate of the machine can take place.
  • the setpoint specification can be transmitted by a downstream machine so that its requirements are met.
  • the bale-removing machine calculates a desired value in its own controller on the basis of the demand requested by the subsequent machine; this is possible, for example, because of the stop-and-go information of a subsequently arranged machine.
  • the difference between the calculated target value for the removal rate and the instantaneous actual value of the removal rate, which is measured by the apparatus for determining the mass of the fiber flake stream, can be used to adjust the actual stock removal rate to the target value.
  • the removal rate of a bale removal machine for example, the travel speed of the ablation tower, the removal depth of the Abtragarmes or the speed of the Abtragswalze be used.
  • the operating parameters of the bale stripper can be optimally matched to one another.
  • the measurement of the fiber flake stream according to the inventive method is carried out online, that is continuously.
  • the measured values are therefore available without great delay and can be used for the control or regulation of the bale removing machine.
  • the power specification for a machine is given by the machine-specific controller, with the power specification being able to be calculated by downstream machines on the basis of their operating data.
  • performance-specific data such as, for example, rotational speeds, fill levels, pressure or speed are conceivable as operating data for calculating a power specification of the upstream machine.
  • the actual power value is then measured by the device for determining a mass of a fiber flake stream and compared with the desired value of the power specification. By changing the operating parameters of the machine, the actual value is equalized to the setpoint and in this way a controlled operation is achieved with the machine's own control.
  • a superordinate control of a cleaning company which controls the at least one bale removal machine, a mixer, a cleaning machine and at least one subsequent card, wherein the individual machines are interconnected with automatic conveyor systems, which the fiber flakes of a processing To bring the next step, be constructed so that in each case a target value specification is provided for the control of the performance of the individual machines and the actual values can be determined by measuring the fiber flake currents of the conveyor systems between the machines with a centimeter wave sensor.
  • Fig. 1 is a schematic and simplified representation of the principle of action of a
  • FIG. 2 shows a schematic illustration of a bale removal machine with a built-in fiber-flake current measurement
  • FIG. Fig. 3 is a schematic representation of a first embodiment of a control of a spinning preparation plant
  • Fig. 4 is a schematic representation of a first embodiment of a control of a spinning preparation plant.
  • FIG. 1 shows a simplified representation of the mode of operation of a centimeter wave sensor 1.
  • a centimeter wave sensor 1 is fastened.
  • the channel wall 6 is designed at this point so that radio waves can penetrate the channel wall 6 unhindered and without reflection. This can be achieved, for example, by a suitable choice of material in front of the transmitting and receiving opening of the centimeter wave sensor 1.
  • the centimeter wave sensor 1 transmits high-frequency signals in the range of 2 to 20 GHz. These transmitted signals are referred to as transmission wave 2.
  • the transmission wave 2 is reflected by a fiber flake 4. Due to the reflection 5 on the fiber flake 4, the emitted signal 2 is reversed in its direction and sent back as a receiving wave 3 to the centimeter wave sensor 1.
  • the return to the centimeter wave sensor 1 receiving shaft 3 is also referred to as echo.
  • a phase shift ⁇ occurs between the transmission shaft 2 and the reception shaft 3.
  • the reception wave 3 intercepted by the centimeter wave sensor 1 is compared with the transmission wave 2 and the phase shift ⁇ is determined.
  • These data are forwarded to an evaluation unit 7. Due to the phase shift ⁇ , the output value unit determine 7 different properties of the fiber flake 4 at the point where the transmission wave 2 was reflected.
  • the characteristics which can be determined in this case are, for example, the size of the fiber flake 4, the surface structure of the fiber flake 4, the speed at which the fiber flake 4 moves past the centimeter wave sensor 1 and in which direction the fiber flake 4 moves. From these properties, the evaluation unit 7 can determine the current mass flow with the aid of material-specific conversion factors stored in the evaluation unit 7 and statistically determined reference values.
  • FIG. 2 schematically shows a bale removal machine 10.
  • a bale removal machine 10 the fiber bales 13 set up in one or more rows are removed from top to bottom.
  • a so-called ablation tower 11 is moved along the fiber bale 13.
  • a Abtragarm 12 is attached.
  • the Abtragarm 12 solves with attached funds flakes of the fiber bales 13 and promotes them through the interior of the Abtragarmes 12 and the Abtragturms 11 arranged in the Abtragturm 11 conveyor channel 14.
  • the fiber flakes in the form of a fiber fluff 15 in the conveying direction 16 sucked off.
  • the flock channel within the Abtragturms 11 or the flock channel within the Abtragarmes a possible installation location 17 for a centimeter wave sensor 1.
  • the point 17 near the exit from the bale stripper 10 is referred to as the installation location.
  • the flock stream 15 removed by the bale-removing machine 10 can be determined and it is possible to achieve a volume control on the bale-removing machine 10.
  • the ball-removing machine 10 can be driven under power control.
  • FIG 3 a spinning preparation plant is shown schematically. With a bale removing machine 10 13 fiber flakes 4 are replaced by the fiber bale. These fiber flakes 4 are conveyed as a fiber flake stream 15 to a mixer 20. After passing through the mixer 20, the fiber flakes 4 are transferred to a cleaning machine 21 and subsequently transported to a card 22 to become. In the card 22, the fiber flakes 4 are dissolved in individual fibers, aligned and formed into a sliver. This is stored in a so-called tape storage 23 in pots.
  • the card 22 is operated at a predetermined power. To achieve this performance, a certain amount of fiber flakes is necessary. This results in calculable nominal values for the fiber flake mass of the upstream machine to be supplied.
  • the delivery of the upstream machines in this case the cleaning machine 21, the mixer 20 and the bale stripper 10 can be controlled to a calculated from the measurement 32 in front of the card 22 setpoint.
  • the measured actual values of the flake streams 30, 31, 32 are combined in a higher-level controller 34.
  • the measured values are compared with the calculated setpoint values and the machines are adjusted in their performance according to the deviations between the setpoints and the actual values.
  • the setpoint values for the machines upstream of the carding machine 22 are continuously adjusted. This results in a controlled production in the entire spinning preparation plant, whereby a stop-and-go operation of individual machines can be largely prevented or at least optimally designed.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Textile Engineering (AREA)
  • Health & Medical Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Chemical & Material Sciences (AREA)
  • General Physics & Mathematics (AREA)
  • Analytical Chemistry (AREA)
  • Biochemistry (AREA)
  • General Health & Medical Sciences (AREA)
  • Immunology (AREA)
  • Pathology (AREA)
  • Electromagnetism (AREA)
  • Medicinal Chemistry (AREA)
  • Food Science & Technology (AREA)
  • Fluid Mechanics (AREA)
  • Preliminary Treatment Of Fibers (AREA)

Abstract

L'invention concerne un dispositif permettant de déterminer une masse d'un flux d'amas de fibres (15), ledit dispositif étant constitué d'un capteur à ondes centimétriques (1), destiné à mesurer des propriétés des amas de fibres (4), et des moyens étant prévus pour déterminer le flux massique à partir des propriétés mesurées desdits amas de fibres (4). L'invention concerne également le procédé associé permettant de déterminer une masse d'un flux d'amas de fibres (15) ainsi qu'un système de commande en fonction des besoins dans un département d'ouverture et de battage.
PCT/CH2007/000630 2007-01-31 2007-12-12 Capteur à ondes centimétriques WO2008092285A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CH161/07 2007-01-31
CH1612007 2007-01-31

Publications (1)

Publication Number Publication Date
WO2008092285A1 true WO2008092285A1 (fr) 2008-08-07

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PCT/CH2007/000630 WO2008092285A1 (fr) 2007-01-31 2007-12-12 Capteur à ondes centimétriques

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WO (1) WO2008092285A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2009062325A1 (fr) * 2007-11-15 2009-05-22 Maschinenfabrik Rieter Ag Machine destinée à ouvrir des balles
CN110573664A (zh) * 2017-05-04 2019-12-13 特吕茨施勒有限及两合公司 运行开包机的方法和以此运行的开包机

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0415156A1 (fr) * 1989-08-10 1991-03-06 Maschinenfabrik Rieter Ag Procédé et appareil pour commander une ouvreuse des balles
WO2003050530A2 (fr) * 2001-12-11 2003-06-19 Rieter Ingolstadt Spinnereimaschinenbau Ag Utilisation de micro-ondes dans l'industrie de la filature
DE10313964A1 (de) * 2003-03-27 2004-10-07 Trützschler GmbH & Co KG Mikrowellen-Messanordnung zur Produktdichtemessung
DE202005001756U1 (de) * 2004-02-12 2005-05-04 Trützschler GmbH & Co KG Mikrowellensensor zur Messung einer dielektrischen Eigenschaft eines Produkts
DE102004030967A1 (de) * 2004-06-26 2006-01-12 Trützschler GmbH & Co KG Vorrichtung zur Messung der Masse eines eine Spinnereivorbereitungsmaschine oder -anlage durchlaufenden Fasermaterials
US20060168764A1 (en) * 2005-01-15 2006-08-03 Rieter Ingolstadt Spinnereimaschinenbau Ag Spinning-mill preparing machine with a control apparatus

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0415156A1 (fr) * 1989-08-10 1991-03-06 Maschinenfabrik Rieter Ag Procédé et appareil pour commander une ouvreuse des balles
WO2003050530A2 (fr) * 2001-12-11 2003-06-19 Rieter Ingolstadt Spinnereimaschinenbau Ag Utilisation de micro-ondes dans l'industrie de la filature
DE10313964A1 (de) * 2003-03-27 2004-10-07 Trützschler GmbH & Co KG Mikrowellen-Messanordnung zur Produktdichtemessung
DE202005001756U1 (de) * 2004-02-12 2005-05-04 Trützschler GmbH & Co KG Mikrowellensensor zur Messung einer dielektrischen Eigenschaft eines Produkts
DE102004030967A1 (de) * 2004-06-26 2006-01-12 Trützschler GmbH & Co KG Vorrichtung zur Messung der Masse eines eine Spinnereivorbereitungsmaschine oder -anlage durchlaufenden Fasermaterials
US20060168764A1 (en) * 2005-01-15 2006-08-03 Rieter Ingolstadt Spinnereimaschinenbau Ag Spinning-mill preparing machine with a control apparatus

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2009062325A1 (fr) * 2007-11-15 2009-05-22 Maschinenfabrik Rieter Ag Machine destinée à ouvrir des balles
CN110573664A (zh) * 2017-05-04 2019-12-13 特吕茨施勒有限及两合公司 运行开包机的方法和以此运行的开包机
CN110573664B (zh) * 2017-05-04 2022-09-27 特吕茨施勒集团欧洲公司 运行开包机的方法和以此运行的开包机

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