EP0750060A1 - Apparatus for detecting mass irregularities of a fibre sliver - Google Patents

Apparatus for detecting mass irregularities of a fibre sliver Download PDF

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Publication number
EP0750060A1
EP0750060A1 EP96109122A EP96109122A EP0750060A1 EP 0750060 A1 EP0750060 A1 EP 0750060A1 EP 96109122 A EP96109122 A EP 96109122A EP 96109122 A EP96109122 A EP 96109122A EP 0750060 A1 EP0750060 A1 EP 0750060A1
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EP
European Patent Office
Prior art keywords
measuring chamber
sliver
prechamber
pressure
nozzle
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Granted
Application number
EP96109122A
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German (de)
French (fr)
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EP0750060B1 (en
Inventor
François BAECHLER
Jürg Zehr
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Zellweger Luwa AG
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Zellweger Luwa AG
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Publication of EP0750060A1 publication Critical patent/EP0750060A1/en
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    • D—TEXTILES; PAPER
    • D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
    • D01G—PRELIMINARY TREATMENT OF FIBRES, e.g. FOR SPINNING
    • D01G23/00—Feeding fibres to machines; Conveying fibres between machines
    • D01G23/06—Arrangements in which a machine or apparatus is regulated in response to changes in the volume or weight of fibres fed, e.g. piano motions
    • 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

Definitions

  • the invention relates to a device for determining irregularities in the mass of a sliver, with a measuring chamber, with an inlet and an outlet, for the sliver into which, via an opening or nozzle, a gas stream is introduced, a relationship between the pressure in the Gas flow and the irregularities in the sliver.
  • Such a device is known from DE-A-3036697, in which a gas stream is injected radially through a nozzle into a cylindrical measuring chamber, so that the gas stream penetrates into the fiber sliver and is distributed there.
  • the pressure in the line with which the gas is supplied is recorded and the measured pressure fluctuations are interpreted as an indication of fluctuations in the diameter of the sliver.
  • the line mentioned is also connected to a pressure transducer, so that an electrical signal is available for the diameter fluctuations.
  • the invention as characterized in the patent claims, therefore solves the problem of creating a device which specifies the diameter fluctuations of the fiber sliver more precisely, more quickly and, in particular, as far as possible in a manner adjusted for interference.
  • a small prechamber is assigned or connected upstream of the measuring chamber, into which the gas enters before entering the measuring chamber.
  • the antechamber is delimited against the measuring chamber and against the pressure or gas source by a nozzle or a throttle.
  • the pressure of the gas in the prechamber ie before entering the sliver, is measured with a pressure sensor. This creates the possibility of introducing the gas from the prechamber into the measuring chamber via several openings and thereby measuring an average pressure at a single point, ie in the prechamber.
  • the device Through a suitable choice of parameters such as the size of the prechamber, the openings of the nozzles and the throttle and the pressure of the gas flow at the outlet from the pressure source and thus the mean pressure in the prechamber, it is possible to adapt the device to the existing strip masses and pressure sensors and also to detect rapid changes in pressure caused by rapidly occurring fluctuations in mass of a belt.
  • the arrangement according to the invention of the prechamber and the fact that the pressure in this prechamber is recorded as the measured value are given thus the designer has the possibility, by designing this antechamber, to influence the behavior of the entire device significantly and specifically, namely in the sense of a very quick response to small changes in mass of the sliver or in the sense of a shield or a filter against interference caused by the measuring device itself .
  • the device according to the invention has various further advantages. For example, it also allows thicker sliver to be measured using this method, because the arrangement of several nozzles makes it possible to dispense with the gas flow penetrating into the middle of the sliver. Furthermore, this solution allows the pressure sensor to be arranged very close to the prechamber or to the sliver. With this solution it is also possible to make the measuring chamber interchangeable, so that it can be optimally matched to the sliver to be measured.
  • FIG. 1 shows a measuring chamber 4 in its vicinity, ie at the end of an inlet funnel 3, which is fastened on a measuring funnel plate 2.
  • the measuring chamber 4 is in the vicinity of take-off rollers 1 arranged, which pull the sliver, not shown here, through the measuring chamber 4.
  • FIG. 2 again shows the inlet funnel 3 with the measuring chamber 4 and a sliver 5. Furthermore, a measuring unit 6, an electrical connection 7 and a gas or air channel 8 can also be seen here, which is connected to a source 9 for the air or gas flow .
  • FIG. 3 shows the structure of the device according to the invention in more detail, elements already known from FIG. 2 having the same reference numerals.
  • the measuring unit 6 which is designed, for example, as an integrated pressure sensor or pressure transducer, which converts a pneumatic pressure into a corresponding electrical signal in a manner known per se.
  • the measuring unit 6 borders on a prechamber 10, which is connected to the interior 14 of the measuring chamber 4 via an opening or nozzle 12.
  • the measuring chamber 4 forms a cylindrical housing with an inlet and an outlet for the fiber sliver, and the prechamber 10 lies with the measuring unit 6 in a cylindrical housing 15 which bears against the measuring chamber 4 at right angles to it.
  • the measuring chamber 4 has a recess 16.
  • a sealing ring 13 seals the two cylindrical housings in the recess 16 from one another.
  • the antechamber 10 is connected via one or more bores 11, 17 to an annular channel 18 which is connected to the air channel 8, which is designed here as an air hose.
  • the bore 11, 17 forms a throttle or pre-nozzle, which delimits the pressure in the prechamber 10 from a source for the pressure or the gas and thus causes a predetermined pressure drop.
  • With 19 here is an axis, along which the nozzle 12, the pre-chamber 10 and the measuring unit 6 are lined up. In this embodiment, the nozzle 12 is incorporated into the wall of the measuring chamber 4.
  • FIG. 4 shows an embodiment with an annular prechamber 20 which encloses a measuring chamber 21 and has an air duct 22 on one side and an electrical connection 23 and a measuring unit 24 on the other side. At least two nozzles 25 and 26 open here from the pre-chamber 20 into the measuring chamber 21. A pre-nozzle or throttle against the pressure source is designated here by 47.
  • FIG. 5 shows a further embodiment with a nozzle 28, prechamber 29 and measuring unit 30 arranged along an axis 27, an electrical connection 31 and a pneumatic connection 32 being arranged coaxially.
  • the pre-chamber 29 is supplied with compressed air via an annular channel 33.
  • the ring channel 33 acts here as a throttle or pre-nozzle to the prechamber 29.
  • This ring channel 33 can thus have a cylindrical shape.
  • This ring channel 33 is fed through two or more holes 33a, 33b, so that it can be assumed that in the ring channel 33 the throttle or pre-nozzle can consist of several holes 33a, 33b or constrictions.
  • FIG. 6 shows an embodiment with a prechamber 35 arranged parallel to a measuring chamber axis 34 and with an air supply 36 and a pneumatic connection 37 to the prechamber 35 for a corresponding pneumatic measuring unit. Also recognizable are a pre-nozzle 49 and a nozzle 39 which opens into the measuring chamber 40.
  • FIGS. 4 and 6 are particularly well suited, in addition to the other designs, to provide interchangeable measuring chambers 21, 40.
  • a comparison of further FIGS. 7 and 8 shows the embodiment according to FIG. 4 with a thick-walled measuring chamber 41 and a thin-walled measuring chamber 42.
  • the outside diameter is the same, so that the same construction or socket with sealing rings 43 and 44 can be used. Since it is advantageous for the accuracy of the measurement if the interior 14 of the measuring chamber is predominantly filled by the sliver, these interchangeable measuring chambers can take the specified strip thickness into account.
  • Exchangeable measuring chambers can also be used to change the number of nozzles 45, 46 and to adapt them to the sliver thickness. In both versions, the outer circumference of the measuring chamber 21, 40 limits the antechamber 20, 35 on one side.
  • the device detects the pressure fluctuations in the prechamber via the measuring unit, which is designed as a pressure sensor.
  • the pressure in front of the pre-chamber is stabilized because it is shielded by the throttle or pre-nozzle from interfering influences that could come from the air supply. Since a certain volume of air can also be stored in the prechamber depending on its size, this can also be used as a filter for small pressure fluctuations that are independent of the sliver or for noise that is caused by the sliver. So the pressure sensor only measures those pressure fluctuations, which are produced by the sliver and which are considered essential.

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Preliminary Treatment Of Fibers (AREA)
  • Spinning Or Twisting Of Yarns (AREA)
  • Measuring Fluid Pressure (AREA)
  • Measuring Arrangements Characterized By The Use Of Fluids (AREA)

Abstract

An appts. to determine sliver (5) mass irregularities has a measuring chamber (4) with entry and exit for the sliver. A gas stream is fed into the chamber through an opening or nozzle (12) and a relationship exists between the pressure in the gas stream and the sliver irregularity. An antechamber (10) is supplied which is connected via a constriction (17) to a source (9) of gas at constant pressure and via the opening or nozzle to the measuring chamber. A measurement device (6) is connected to the antechamber.

Description

Die Erfindung betrifft eine Vorrichtung zur Bestimmung von Unregelmässigkeiten der Masse eines Faserbandes, mit einer Messkammer, mit einem Eingang und einem Ausgang, für das Faserband, in die, über eine Öffnung oder Düse, ein Gasstrom eingeführt wird, wobei eine Beziehung zwischen dem Druck im Gasstrom und den Unregelmässigkeiten im Faserband besteht.The invention relates to a device for determining irregularities in the mass of a sliver, with a measuring chamber, with an inlet and an outlet, for the sliver into which, via an opening or nozzle, a gas stream is introduced, a relationship between the pressure in the Gas flow and the irregularities in the sliver.

Aus der DE-A-3036697 ist eine solche Vorrichtung bekannt, bei der ein Gasstrom über eine Düse radial in eine zylindrische Messkammer eingespritzt wird, so dass der Gasstrom in das Faserband eindringt und sich dort verteilt. Vor seinem Eintritt in die Messkammer wird der Druck in der Leitung, mit der das Gas zugeführt wird, erfasst und die gemessenen Druckschwankungen werden als Hinweis auf Durchmesserschwankungen des Faserbandes aufgefasst. Dazu ist die genannte Leitung auch an einen Druckwandler angeschlossen, so dass für die Durchmesserschwankungen ein elektrisches Signal zur Verfügung steht.Such a device is known from DE-A-3036697, in which a gas stream is injected radially through a nozzle into a cylindrical measuring chamber, so that the gas stream penetrates into the fiber sliver and is distributed there. Before entering the measuring chamber, the pressure in the line with which the gas is supplied is recorded and the measured pressure fluctuations are interpreted as an indication of fluctuations in the diameter of the sliver. For this purpose, the line mentioned is also connected to a pressure transducer, so that an electrical signal is available for the diameter fluctuations.

Bei dieser Vorrichtung werden auch Druckschwankungen, die von Durchmesserschwankungen des Faserbandes unabhängig sind, sofort an das Messsystem weitergegeben. Solche Druckschwankungen können beispielsweise bloss von zeitlich begrenzten besonderen Strömungsverhältinssen in den Zuführleitungen herrühren, werden aber doch den Durchmesserschwankungen zugerechnet. Oder, ein im Bereiche der Düse verdichtetes Faserband kann kurzzeitig dem Gasstrom einen höheren Widerstand entgegensetzen, so dass auch dieser Umstand als Durchmesserschwankung verstanden wird.With this device, pressure fluctuations that are independent of fluctuations in the diameter of the sliver are also immediately passed on to the measuring system. Such pressure fluctuations can, for example, only result from temporary flow conditions in the supply lines, but are nevertheless attributed to the fluctuations in diameter. Or, one in the area The sliver compressed by the nozzle can briefly offer a higher resistance to the gas flow, so that this fact is also understood as a fluctuation in diameter.

Die Erfindung, wie sie in den Patentansprüchen gekennzeichnet ist, löst demnach die Aufgabe eine Vorrichtung zu schaffen, die die Durchmesserschwankungen des Faserbandes genauer, schneller und insbesondere von Störeinflüssen möglichst bereinigt angibt.The invention, as characterized in the patent claims, therefore solves the problem of creating a device which specifies the diameter fluctuations of the fiber sliver more precisely, more quickly and, in particular, as far as possible in a manner adjusted for interference.

Diese Aufgabe wird dadurch gelöst, dass der Messkammer eine kleine Vorkammer zugeordnet oder vorgeschaltet wird, in die das Gas vor dem Eintritt in die Messkammer gelangt. Die Vorkammer wird gegen die Messkammer und gegen die Druck- oder Gasquelle hin durch je eine Düse, bzw. eine Drossel abgegrenzt. Damit wird als Hinweis auf die Masse des Faserbandes der Druck des Gases in der Vorkammer, d.h. vor dem Eintritt in das Faserband mit einem Drucksensor gemessen. Es ist damit die Möglichkeit geschaffen, das Gas aus der Vorkammer auch über mehrere Öffnungen in die Messkammer einzuführen und dabei an einer einzigen Stelle, d.h. in der Vorkammer einen gemittelten Druck zu messen. Durch geeignete Wahl der Parameter wie Grösse der Vorkammer, der Öffnungen der Düsen und der Drossel sowie des Druckes des Gasstromes am Austritt aus der Druckquelle und damit des mittleren Druckes in der Vorkammer ist es möglich, eine Anpassung der Vorrichtung an die vorhandenen Bandmassen und Drucksensoren vorzunehmen und auch schnelle Druckänderungen zu erfassen, die durch schnell ablaufende Masseschwankungen eines Bandes verursacht sind. Die erfindungsgemässe Anordnung der Vorkammer und der Umstand, dass als Messwert der Druck in dieser Vorkammer erfasst wird, gibt somit dem Konstrukteur die Möglichkeit durch die Gestaltung dieser Vorkammer das Verhalten der gesamten Vorrichtung wesentlich und gezielt zu beeinflussen, nämlich im Sinne eines sehr schnellen Ansprechens auf kleine Masseänderungen des Faserbandes oder im Sinne einer Abschirmung oder eines Filters gegen Störeinflüsse, die von der Messeinrichtung selbst herrühren.This object is achieved in that a small prechamber is assigned or connected upstream of the measuring chamber, into which the gas enters before entering the measuring chamber. The antechamber is delimited against the measuring chamber and against the pressure or gas source by a nozzle or a throttle. As a reference to the mass of the sliver, the pressure of the gas in the prechamber, ie before entering the sliver, is measured with a pressure sensor. This creates the possibility of introducing the gas from the prechamber into the measuring chamber via several openings and thereby measuring an average pressure at a single point, ie in the prechamber. Through a suitable choice of parameters such as the size of the prechamber, the openings of the nozzles and the throttle and the pressure of the gas flow at the outlet from the pressure source and thus the mean pressure in the prechamber, it is possible to adapt the device to the existing strip masses and pressure sensors and also to detect rapid changes in pressure caused by rapidly occurring fluctuations in mass of a belt. The arrangement according to the invention of the prechamber and the fact that the pressure in this prechamber is recorded as the measured value are given thus the designer has the possibility, by designing this antechamber, to influence the behavior of the entire device significantly and specifically, namely in the sense of a very quick response to small changes in mass of the sliver or in the sense of a shield or a filter against interference caused by the measuring device itself .

Die erfindungsgemässe Vorrichtung weist verschiedene weitere Vorteile auf. Beispielsweise erlaubt sie es auch dickeres Faserband nach dieser Methode zu messen, weil die Anordnung mehrerer Düsen es erlaubt auf ein Eindringen des Gasstromes bis in die Mitte des Faserbandes zu verzichten. Ferner kann durch diese Lösung der Drucksensor sehr nahe an der Vorkammer oder am Faserband angeordnet werden. Es ist durch diese Lösung ferner möglich, die Messkammer auswechselbar zu gestalten, so dass diese bestens auf das zu messende Faserband abgestimmt werden kann.The device according to the invention has various further advantages. For example, it also allows thicker sliver to be measured using this method, because the arrangement of several nozzles makes it possible to dispense with the gas flow penetrating into the middle of the sliver. Furthermore, this solution allows the pressure sensor to be arranged very close to the prechamber or to the sliver. With this solution it is also possible to make the measuring chamber interchangeable, so that it can be optimally matched to the sliver to be measured.

Im folgenden wird die Erfindung anhand eines Beispiels und mit Bezug auf die beiliegenden Figuren näher erläutert, wobei

  • Figur 1 und 2 je einen Schnitt durch eine erfindungsgemässe Vorrichtung und ihre Umgebung und
  • Figuren 3 bis 8 einen Schnitt durch einen Teil je einer Ausführung zeigen.
In the following the invention is explained in more detail using an example and with reference to the accompanying figures, wherein
  • Figures 1 and 2 each a section through an inventive device and its environment and
  • Figures 3 to 8 show a section through part of each version.

Figur 1 zeigt eine Messkammer 4 in ihrer Umgebung, d.h. am Ende eines Einlauftrichters 3, der auf einer Messtrichterplatte 2 befestigt ist. Die Messkammer 4 ist in der Nähe von Abzugswalzen 1 angeordnet, die das hier nicht gezeigte Faserband durch die Messkammer 4 ziehen.FIG. 1 shows a measuring chamber 4 in its vicinity, ie at the end of an inlet funnel 3, which is fastened on a measuring funnel plate 2. The measuring chamber 4 is in the vicinity of take-off rollers 1 arranged, which pull the sliver, not shown here, through the measuring chamber 4.

Figur 2 zeigt nochmals den Einlauftrichter 3 mit der Messkammer 4 und einem Faserband 5. Weiter sind hier auch eine Messeinheit 6, ein elektrischer Anschluss 7 und ein Gas- oder Luftkanal 8 erkennbar, der an eine Quelle 9 für den Luft- oder Gasstrom angeschlossen ist.FIG. 2 again shows the inlet funnel 3 with the measuring chamber 4 and a sliver 5. Furthermore, a measuring unit 6, an electrical connection 7 and a gas or air channel 8 can also be seen here, which is connected to a source 9 for the air or gas flow .

Figur 3 lässt den Aufbau der erfindungsgemässen Vorrichtung genauer erkennen, wobei bereits aus der Fig. 2 bekannte Elemente dieselben Bezugszeichen aufweisen. Hier erkennt man wieder die Messeinheit 6, die beispielsweise als integrierter Drucksensor oder Druckwandler ausgebildet ist, der in an sich bekannter Weise einen pneumatischen Druck in ein entsprechendes elektrisches Signal umwandelt. Die Messeinheit 6 grenzt an eine Vorkammer 10, die über eine Öffnung oder Düse 12 mit dem Innenraum 14 der Messkammer 4 verbunden ist. Die Messkammer 4 bildet ein zylindrisches Gehäuse mit einem Eingang und einem Ausgang für das Faserband und die Vorkammer 10 liegt mit der Messeinheit 6 in einem zylindrischen Gehäuse 15, das rechtwinklig zur Messkammer 4 an dieser ansteht. Dazu weist die Messkammer 4 eine Ausnehmung 16 auf. Ein Dichtungsring 13 dichtet die beiden zylindrischen Gehäuse in der Ausnehmung 16 zueinander ab. Die Vorkammer 10 ist über eine oder mehrere Bohrungen 11, 17 mit einem Ringkanal 18 verbunden, der mit dem Luftkanal 8 verbunden ist, der hier als Luftschlauch ausgebildet ist. Die Bohrung 11, 17 bildet dabei eine Drossel oder Vordüse, die den Druck in der Vorkammer 10 gegen eine Quelle für den Druck oder das Gas abgrenzt und somit einen vorbestimmten Druckabfall bewirkt. Mit 19 ist hier eine Achse bezeichnet, längs der die Düse 12, die Vorkammer 10 und die Messeinheit 6 aufgereiht sind. In dieser Ausführung ist die Düse 12 in die Wandung der Messkammer 4 eingearbeitet.FIG. 3 shows the structure of the device according to the invention in more detail, elements already known from FIG. 2 having the same reference numerals. Here again one recognizes the measuring unit 6, which is designed, for example, as an integrated pressure sensor or pressure transducer, which converts a pneumatic pressure into a corresponding electrical signal in a manner known per se. The measuring unit 6 borders on a prechamber 10, which is connected to the interior 14 of the measuring chamber 4 via an opening or nozzle 12. The measuring chamber 4 forms a cylindrical housing with an inlet and an outlet for the fiber sliver, and the prechamber 10 lies with the measuring unit 6 in a cylindrical housing 15 which bears against the measuring chamber 4 at right angles to it. For this purpose, the measuring chamber 4 has a recess 16. A sealing ring 13 seals the two cylindrical housings in the recess 16 from one another. The antechamber 10 is connected via one or more bores 11, 17 to an annular channel 18 which is connected to the air channel 8, which is designed here as an air hose. The bore 11, 17 forms a throttle or pre-nozzle, which delimits the pressure in the prechamber 10 from a source for the pressure or the gas and thus causes a predetermined pressure drop. With 19 here is an axis, along which the nozzle 12, the pre-chamber 10 and the measuring unit 6 are lined up. In this embodiment, the nozzle 12 is incorporated into the wall of the measuring chamber 4.

Figur 4 zeigt eine Ausführung mit einer ringförmigen Vorkammer 20, die eine Messkammer 21 umschliesst und auf einer Seite einen Luftkanal 22 und auf der anderen Seite einen elektrischen Anschluss 23 und eine Messeinheit 24 aufweist. Mindestens zwei Düsen 25 und 26 münden hier aus der Vorkammer 20 in die Messkammer 21. Eine Vordüse oder Drossel gegen die Druckquelle hin ist hier mit 47 bezeichnet.FIG. 4 shows an embodiment with an annular prechamber 20 which encloses a measuring chamber 21 and has an air duct 22 on one side and an electrical connection 23 and a measuring unit 24 on the other side. At least two nozzles 25 and 26 open here from the pre-chamber 20 into the measuring chamber 21. A pre-nozzle or throttle against the pressure source is designated here by 47.

Figur 5 zeigt eine weitere Ausführung mit längs einer Achse 27 angeordneter Düse 28, Vorkammer 29 und Messeinheit 30, wobei ein elektrischer Anschluss 31 und ein pneumatischer Anschluss 32 koaxial angeordnet sind. Dabei wird die Vorkammer 29 über einen Ringkanal 33 mit Druckluft beliefert. Der Ringkanal 33 wirkt hier als Drossel oder Vordüse zur Vorkammer 29. Dieser Ringkanal 33 kann somit eine zylindrische Form aufweisen. Gespeist wird dieser Ringkanal 33 durch zwei oder mehr Bohrungen 33a, 33b, so dass man davon ausgehen kann, dass im Ringkanal 33 die Drossel oder Vordüse aus mehreren Bohrungen 33a, 33b oder Einschnürungen bestehen kann.FIG. 5 shows a further embodiment with a nozzle 28, prechamber 29 and measuring unit 30 arranged along an axis 27, an electrical connection 31 and a pneumatic connection 32 being arranged coaxially. The pre-chamber 29 is supplied with compressed air via an annular channel 33. The ring channel 33 acts here as a throttle or pre-nozzle to the prechamber 29. This ring channel 33 can thus have a cylindrical shape. This ring channel 33 is fed through two or more holes 33a, 33b, so that it can be assumed that in the ring channel 33 the throttle or pre-nozzle can consist of several holes 33a, 33b or constrictions.

Figur 6 zeigt eine Ausführung mit parallel zu einer Messkammerachse 34 angeordneter Vorkammer 35 sowie mit einer Luftzuführung 36 und einem pneumatischen Anschluss 37 zur Vorkammer 35 für eine entsprechende pneumatische Messeinheit. Ebenfalls erkennbar sind eine Vordüse 49 und eine Düse 39, die in die Messkammer 40 mündet.FIG. 6 shows an embodiment with a prechamber 35 arranged parallel to a measuring chamber axis 34 and with an air supply 36 and a pneumatic connection 37 to the prechamber 35 for a corresponding pneumatic measuring unit. Also recognizable are a pre-nozzle 49 and a nozzle 39 which opens into the measuring chamber 40.

Ausführungen gemäss den Figuren 4 und 6 eignen sich neben den anderen Ausführungen besonders gut dafür, auswechselbare Messkammern 21, 40 vorzusehen. Eine Gegenüberstellung weiterer Figuren 7 und 8 zeigt die Ausführung gemäss Fig. 4 mit dickwandiger Messkammer 41 und dünnwandiger Messkammer 42. In beiden Fällen ist der Aussendurchmesser gleich, so dass die gleiche Konstruktion oder Fassung mit Dichtungsringen 43 und 44 verwendet werden kann. Da es für die Genauigkeit der Messung vorteilhaft ist, wenn der Innenraum 14 der Messkammer durch das Faserband überwiegend ausgefüllt ist, kann durch diese auswechselbaren Messkammern auf die vorgegebene Banddicke Rücksicht genommen werden. Auswechselbare Messkammern können auch dazu dienen, die Anzahl der Düsen 45, 46 zu verändern und an die Faserbanddicke anzupassen. In beiden Ausführungen begrenzt der Aussenumfang der Messkammer 21, 40 die Vorkammer 20, 35 auf einer Seite.Designs according to FIGS. 4 and 6 are particularly well suited, in addition to the other designs, to provide interchangeable measuring chambers 21, 40. A comparison of further FIGS. 7 and 8 shows the embodiment according to FIG. 4 with a thick-walled measuring chamber 41 and a thin-walled measuring chamber 42. In both cases the outside diameter is the same, so that the same construction or socket with sealing rings 43 and 44 can be used. Since it is advantageous for the accuracy of the measurement if the interior 14 of the measuring chamber is predominantly filled by the sliver, these interchangeable measuring chambers can take the specified strip thickness into account. Exchangeable measuring chambers can also be used to change the number of nozzles 45, 46 and to adapt them to the sliver thickness. In both versions, the outer circumference of the measuring chamber 21, 40 limits the antechamber 20, 35 on one side.

Die erfindungsgemässe Vorrichtung erfasst über die Messeinheit, die als Drucksensor ausgebildet ist, die Druckschwankungen in der Vorkammer. Vor der Vorkammer ist der Druck stabilisiert, da er durch die Drossel oder Vordüse von störenden Einflüssen abgeschirmt ist, die aus der Luftzuführung stammen könnten. Da in der Vorkammer je nach Grösse auch ein gewisses Luftvolumen gespeichert sein kann, kann dieser auch die Funktion eines Filters für kleine Druckschwankungen, die vom Faserband unabhängig sind oder für Rauschen, das vom Faserband verursacht wird, zugedacht werden. So misst der Drucksensor nur diejenigen Druckschwankungen, die durch das Faserband erzeugt werden und die als wesentlich erachtet werden. Durch geeignete Dimensionierung der Grösse der Vorkammer und des Innendurchmessers der Messkammer ist es möglich viele mögliche Störeinflüsse vor der Messung auszuschalten und die Dynamik oder Reaktionszeit der Vorrichtung zu bestimmen oder hoch zu halten. So können auch sehr kurze Masseschwankungen des Faserbandes an schnelllaufenden Maschinen gemessen werden.The device according to the invention detects the pressure fluctuations in the prechamber via the measuring unit, which is designed as a pressure sensor. The pressure in front of the pre-chamber is stabilized because it is shielded by the throttle or pre-nozzle from interfering influences that could come from the air supply. Since a certain volume of air can also be stored in the prechamber depending on its size, this can also be used as a filter for small pressure fluctuations that are independent of the sliver or for noise that is caused by the sliver. So the pressure sensor only measures those pressure fluctuations, which are produced by the sliver and which are considered essential. By appropriately dimensioning the size of the prechamber and the inner diameter of the measuring chamber, it is possible to eliminate many possible interferences before the measurement and to determine or keep the dynamics or response time of the device high. Very short fluctuations in mass of the sliver can also be measured on high-speed machines.

Claims (9)

Vorrichtung zur Bestimmung von Unregelmässigkeiten der Masse eines Faserbandes (5), mit einer Messkammer (4) mit einem Eingang und einem Ausgang für das Faserband, in die, über eine Öffnung oder Düse (12), ein Gasstrom eingeführt wird, wobei eine Beziehung zwischen dem Druck im Gasstrom und den Unregelmässigkeiten im Faserband besteht, dadurch gekennzeichnet, dass eine Vorkammer (10) vorgesehen ist, die einerseits über eine Drossel (17) mit einer Quelle (9) für einen Gasstrom mit stabilem Druck und andererseits über die Öffnung oder Düse an die Messkammer angeschlossen ist und dass eine Messeinheit (6) an diese Vorkammer angeschlossen ist.Device for determining irregularities in the mass of a sliver (5), with a measuring chamber (4) with an inlet and an outlet for the sliver into which a gas flow is introduced via an opening or nozzle (12), a relationship between the pressure in the gas flow and the irregularities in the fiber sliver, characterized in that a prechamber (10) is provided which on the one hand has a throttle (17) with a source (9) for a gas flow with a stable pressure and on the other hand via the opening or nozzle is connected to the measuring chamber and that a measuring unit (6) is connected to this antechamber. Vorrichtung nach Anspruch 1, dadurch gekennzeichnet, dass eine kurze Reaktionszeit der Vorrichtung durch ein kleines Gasvolumen in der Vorkammer (10) erreicht ist.Device according to claim 1, characterized in that a short reaction time of the device is achieved by a small gas volume in the prechamber (10). Vorrichtung nach Anspruch 1, dadurch gekennzeichnet, dass die Messkammer (41, 42) austauschbar ausgebildet und angeordnet ist.Device according to claim 1, characterized in that the measuring chamber (41, 42) is designed and arranged to be exchangeable. Vorrichtung nach Anspruch 3, dadurch gekennzeichnet, dass eine Anpassung der Vorrichtung an eine vorgegebene Dicke des Faserbandes wahlweise durch Einstellen des Druckes in der Quelle und durch Austausch der Messkammer mit der Düse erfolgt.Apparatus according to claim 3, characterized in that an adaptation of the device to a predetermined thickness of the sliver optionally by adjusting the pressure in the source and by exchanging the measuring chamber with the nozzle. Vorrichtung nach Anspruch 1, dadurch gekennzeichnet, dass die Vorkammer mehrere Öffnungen (25, 26) zur Messkammer hin aufweist.Device according to claim 1, characterized in that the prechamber has a plurality of openings (25, 26) towards the measuring chamber. Vorrichtung nach Anspruch 1, dadurch gekennzeichnet, dass die Quelle (9) zur Abgabe eines Gasstromes mit einstellbarem und stabilisiertem Druck ausgebildet ist.Apparatus according to claim 1, characterized in that the source (9) is designed to deliver a gas stream with adjustable and stabilized pressure. Vorrichtung nach Anspruch 1, dadurch gekennzeichnet, dass die Vorkammer (20, 35) parallel zur Achse (34) der Messkammer erstreckend ausgebildet ist.Device according to claim 1, characterized in that the prechamber (20, 35) is designed to extend parallel to the axis (34) of the measuring chamber. Vorrichtung nach Anspruch 1, dadurch gekennzeichnet, dass die Vorkammer (20) die Messkammer ringförmig umfassend ausgebildet ist.Apparatus according to claim 1, characterized in that the prechamber (20) of the measuring chamber is designed to be annular. Vorrichtung nach Anspruch 1, dadurch gekennzeichnet, dass die Vorkammer (20, 35) einerseits durch den Aussenumfang der Messkammer (21, 40) begrenzt ist.Device according to claim 1, characterized in that the prechamber (20, 35) is delimited on the one hand by the outer circumference of the measuring chamber (21, 40).
EP96109122A 1995-06-22 1996-06-07 Apparatus for detecting mass irregularities of a fibre sliver Expired - Lifetime EP0750060B1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
CH182895 1995-06-22
CH01828/95A CH690131A5 (en) 1995-06-22 1995-06-22 Device for determining irregularities in the mass of a sliver.
CH1828/95 1995-06-22

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EP0750060A1 true EP0750060A1 (en) 1996-12-27
EP0750060B1 EP0750060B1 (en) 1999-12-08

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EP96109122A Expired - Lifetime EP0750060B1 (en) 1995-06-22 1996-06-07 Apparatus for detecting mass irregularities of a fibre sliver

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US (1) US5709011A (en)
EP (1) EP0750060B1 (en)
JP (1) JPH0913236A (en)
CN (1) CN1071810C (en)
AT (1) ATE187507T1 (en)
CH (1) CH690131A5 (en)
DE (1) DE59603835D1 (en)

Families Citing this family (2)

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Publication number Priority date Publication date Assignee Title
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JPH11222735A (en) * 1997-10-30 1999-08-17 Zellweger Luwa Ag Suction equipment for fibrous intermediate product extended lengthily

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US4184361A (en) * 1976-12-18 1980-01-22 Trutzschler Gmbh & Co. Kg Sliver density sensing apparatus
GB1599222A (en) * 1978-05-03 1981-09-30 Fiber Controls Corp Sliver auto-leveller
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JPS63175125A (en) * 1987-01-09 1988-07-19 Chubu Seiko Kk Drawframe
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Also Published As

Publication number Publication date
CN1071810C (en) 2001-09-26
JPH0913236A (en) 1997-01-14
CH690131A5 (en) 2000-05-15
US5709011A (en) 1998-01-20
CN1142547A (en) 1997-02-12
EP0750060B1 (en) 1999-12-08
DE59603835D1 (en) 2000-01-13
ATE187507T1 (en) 1999-12-15

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