EP2384823B1 - Air jet sieve - Google Patents

Air jet sieve Download PDF

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Publication number
EP2384823B1
EP2384823B1 EP11002770.3A EP11002770A EP2384823B1 EP 2384823 B1 EP2384823 B1 EP 2384823B1 EP 11002770 A EP11002770 A EP 11002770A EP 2384823 B1 EP2384823 B1 EP 2384823B1
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EP
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Prior art keywords
sieve
air
air jet
triboelectric
accordance
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EP11002770.3A
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German (de)
French (fr)
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EP2384823A1 (en
Inventor
Hans Kaiser (Dipl.-Ing.(FH)
Georg Konetzka (Dipl.Ing. (grad)
Markus Schönwetter
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Hosokawa Alpine AG
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Hosokawa Alpine AG
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B07—SEPARATING SOLIDS FROM SOLIDS; SORTING
    • B07B—SEPARATING SOLIDS FROM SOLIDS BY SIEVING, SCREENING, SIFTING OR BY USING GAS CURRENTS; SEPARATING BY OTHER DRY METHODS APPLICABLE TO BULK MATERIAL, e.g. LOOSE ARTICLES FIT TO BE HANDLED LIKE BULK MATERIAL
    • B07B11/00—Arrangement of accessories in apparatus for separating solids from solids using gas currents
    • B07B11/04—Control arrangements
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B07—SEPARATING SOLIDS FROM SOLIDS; SORTING
    • B07B—SEPARATING SOLIDS FROM SOLIDS BY SIEVING, SCREENING, SIFTING OR BY USING GAS CURRENTS; SEPARATING BY OTHER DRY METHODS APPLICABLE TO BULK MATERIAL, e.g. LOOSE ARTICLES FIT TO BE HANDLED LIKE BULK MATERIAL
    • B07B4/00—Separating solids from solids by subjecting their mixture to gas currents
    • B07B4/08—Separating solids from solids by subjecting their mixture to gas currents while the mixtures are supported by sieves, screens, or like mechanical elements

Definitions

  • the invention is directed to an air jet screen with a housing, at least one sieve, which is insertable into the housing, with a slot nozzle below the sieve bottom, a drive for the slot nozzle, an air supply to the slot nozzle and an air discharge through the housing from the space below the Sieve bottom and a control device which controls the operation of the screening machine thus formed and a method for operating the air jet screen.
  • Air jet screens of the generic type are used in analysis sieving, to determine finenesses and particle size distributions of dry powdery materials. Analytical screens are being further automated to rule out operator errors and to achieve high measurement accuracy and reproducibility.
  • a generic air jet sieve consists of a housing on which a sieve with a flat sieve bottom is placed.
  • the screen space above the sieve bottom is closed during a screening with a lid.
  • Below the sieve bottom the housing has a free space.
  • a rotatable about the vertical center axis of the screen slit nozzle is arranged.
  • air is blown against the sieve bottom from below by the uniformly rotating slot nozzle.
  • the jet of air blows out the meshes of the screen mesh and swirls up the screenings lying on the screen.
  • the fines of the material to be screened are entrained by the air jet and transported through the screen fabric from top to bottom in the space below the sieve insert and discharged from there from the screening machine.
  • the coarse fractions which are larger than the mesh size of the respective sieve insert, can not pass through the sieve and remain on the sieve fabric after sieving.
  • material can be re-weighed for each sieving.
  • dust measurement in flowing gases is known using the triboelectric effect. It is a qualitative dust measurement. The principle is based on the transfer of charges when two bodies are brought into contact with each other by touch or friction. The charge difference is the basis for the triboelectric measurement. In this way, a qualitative monitoring of the dust concentration can take place and a relative allocation of the particle concentration can take place. An exact assignment The measuring signal for dust concentration is only possible in cases of constant speed.
  • a disadvantage of the already known optical method is the sensitive and costly measurement technique for the optical detection of the amount of particles in the exhaust stream, especially in abrasive products.
  • two components namely transmitter and receiver are necessary. These are separated by means of glass panes of the particle flow, the glass must be kept dust-free, which is very expensive.
  • These measures require a large Bauvolumen._Nachtaria given predetermined screen times, even if they differ for screens with different Siebmaschenweiten and different materials, is that depending on the Siebmaschenweite the material to be screened for different lengths sieved, which is e.g. for non-abrasion-resistant materials leads to different stress on the substance and to a falsification of the measurement result.
  • the invention is therefore an object of the invention to provide a solution that allows the sieve progress in a screening with an air jet sieve to determine the screening time.
  • the object is achieved in that the screening machine has a measuring probe, are triboelectrically detectable by the particles in the flow direction after the sieve bottom.
  • a crucial process parameter for screening is the sieving time.
  • the sieving time of a sieving influences its separation limit and selectivity. Ideally, the sieving time is chosen so that only material which is larger than the Siebmaschenweite, lying on the screen, and thus no material is present in the extracted air flow more. Since the material to be screened has no ideal behavior, for. B. no constant samples are processed, is not resistant to abrasion, is sticky, electrostatically charged, the grain shape deviates from the ball, a screening can take forever. The sieving time is too depending on the mesh size of the selected screen. The sieving time of screens with sieves of large mesh size is less than that with small mesh size.
  • the sieving time must not be too long, as otherwise sensitive products are subjected to excessive stress and comminution or abrasion processes occur during sieving. From the economic point of view, the sieving time should be as short as possible, but at the same time the screenings should be representative and repeatable.
  • it is provided to equip an air-jet screen with a measuring technique which makes it possible to determine the progress of the sieve and to determine the sieving time of a measurement as a function of the material and sieve mesh size in a reproducible manner.
  • a dust measurement according to the triboelectric measuring principle is envisaged.
  • the measuring probe is installed downstream of the sieve bottom in the air jet sieve, for example in the exhaust air duct.
  • the raw signals on a triboelectric probe are very small, since only small amounts of charge are transferred and transported. Therefore, the charge amplifier must be coupled with particularly high impedance and have a high amplification factor. Such systems are prone to interference from interfering signals. Therefore, the probe and the amplifier should be connected with the shortest possible and interference-proof cables. It is ideal to completely dispense with cables for transporting the triboelectrically generated charges and to connect the probe and the amplifier directly.
  • the printed circuit board of the amplifier which is wholly or partially in a shielded housing screwed directly to the probe.
  • the triboelectric probe can be integrated at any point in the air jet screen in the flow direction downstream of the sieve bottom, namely wherever the particle air flow flows along a surface after sieving.
  • the probe can also be designed as a planar element on the bottom or the wall of the space below the sieve bottom.
  • the triboelectric sensor can be integrated into the slot nozzle.
  • This qualitative signal of the triboelectric probe is recorded time-dependent and can be correlated with the sieve progress. The course of the signal is used to determine the sieving time.
  • Sieving can be carried out so economically, since the screening time of each screening is adapted to the material and the screening conditions.
  • the use of the triboelectric measuring principle for the detection of particles in the exhaust air flow represents an economical measuring method.
  • the measuring probe is simple in construction, has a low construction volume and is insensitive to contamination and wear.
  • the invention is characterized by a method for operating the Lucasstrahisiebs, in which the particles are detected in the exhaust air flow and correlated with the Siebfortinho.
  • the detection of the particles in the exhaust air flow takes place according to the triboelectric principle.
  • the qualitative measurement signal of the triboelectric probe is recorded over time and the course of the signal is used to determine the screening time.
  • an air jet screen according to claims 1 to 5 is used.
  • FIG. 1 shows the air jet sieve with probe in the sectional view
  • the air jet screen 1 can be seen in a sectional view.
  • the housing 2 surrounds the drive motor 3 and the transmission 4 with drive shaft 5 for the slot nozzle 6.
  • the housing 2 forms together with the sieve plate 8 the Room 9 below the sieve tray 8 in which the slot nozzle 6 is arranged.
  • the sieve space 10 is limited by the sieve bottom 8 and the lid 11.
  • the lid 11 has a handle 12 for manually opening and closing the screen space 10.
  • the sieve 7 consists of an annular support structure 13, in which the sieve plate 8 is clamped.
  • the support structure 13 of the screen is loosely inserted into the housing 2 and is centered by a conical shoulder within the housing 2. Air is introduced into the slot nozzle 6 via the supply air duct 14 and blown from below against the sieve bottom 8.
  • the measuring probe 16 for the triboelectric dust measurement and a part of the device for differential pressure measurement between the intake and exhaust is arranged.
  • control panel 17 Also integrated in the housing is the control panel 17. It has a keypad, over which all required inputs can be made. Instead of the keyboard, a touch panel or a rotary knob can be used. A data interface to a computer can also be provided.
  • the built-in exhaust air duct 15 triboelectric probe 16 is connected to the amplifier with the shortest possible and fail-safe lines.
  • the invention is dispensed with cables for transporting the triboelectrically generated charges completely and the probe and the amplifier connected directly.
  • the printed circuit board of the amplifier which is wholly or partially in a shielded housing screwed directly to the probe.
  • the triboelectric sensor 16 can be integrated at any point in the flow direction after the sieve plate 8 in the air jet sieve, eg the exhaust duct 15 or in a connecting line to the downstream filter, namely everywhere where after the screening of the particle air flow flows along a surface.
  • the probe can also be formed as a planar element on the floor and / or the wall of the room below the sieve plate 8.
  • the triboelectric sensor can be integrated into the slot nozzle 6.
  • the required for the pressure measurement sensor is isolated in the exhaust duct 15 and also used as a tribo-electric probe.
  • the triboelectric measurement signal is recorded over time, the progress of the sieve is read from its course and the sieving time is determined.

Description

Die Erfindung richtet sich auf ein Luftstrahlsieb mit einem Gehäuse, mindestens einem Sieb, das in das Gehäuse einsetzbar ist, mit einer Schlitzdüse unterhalb des Siebbodens, einem Antrieb für die Schlitzdüse, einer Luftzuführung zur Schlitzdüse und einer Luftabführung durch das Gehäuse aus dem Raum unterhalb des Siebbodens und einer Steuereinrichtung die den Betrieb der so gebildeten Siebmaschine sowie ein Verfahren zum Betreiben des Luftstrahlsiebs.The invention is directed to an air jet screen with a housing, at least one sieve, which is insertable into the housing, with a slot nozzle below the sieve bottom, a drive for the slot nozzle, an air supply to the slot nozzle and an air discharge through the housing from the space below the Sieve bottom and a control device which controls the operation of the screening machine thus formed and a method for operating the air jet screen.

Luftstrahlsiebe der gattungsgemäßen Art kommen bei der Analysensiebung zum Einsatz, zur Bestimmung von Feinheiten und Korngrößenverteilungen trockner pulverförmiger Materialien. Analysensiebungen werden immer weiter automatisiert um Bedienfehler auszuschließen und eine hohe Messgenauigkeit und Reproduzierbarkeit zu erreichen.Air jet screens of the generic type are used in analysis sieving, to determine finenesses and particle size distributions of dry powdery materials. Analytical screens are being further automated to rule out operator errors and to achieve high measurement accuracy and reproducibility.

Ein gattungsgemäßes Luftstrahlsieb besteht aus einem Gehäuse auf das ein Sieb mit ebenem Siebboden aufgesetzt wird. Der Siebraum oberhalb des Siebbodens wird während einer Siebung mit einem Deckel verschlossen. Unterhalb des Siebbodens weist das Gehäuse einen Freiraum auf. In diesem Raum ist eine um die vertikale Mittelachse des Siebes drehbare Schlitzdüse angeordnet. Während einer Siebung wird durch die gleichmäßig rotierende Schlitzdüse von unten Luft gegen den Siebboden geblasen. Der Luftstrahl bläst die Maschen des Siebgewebes frei und wirbelt das auf dem Sieb liegende Siebgut auf. Die Feinanteile des Siebgutes werden vom Luftstrahl mitgerissen und durch das Siebgewebe von oben nach unten in den Raum unterhalb des Siebeinsatzes transportiert und von dort aus der Siebmaschine ausgetragen. Die groben Anteile, die größer sind als die Maschenweite des jeweiligen Siebeinsatzes, können das Sieb nicht passieren und bleiben nach der Siebung auf dem Siebgewebe liegen.A generic air jet sieve consists of a housing on which a sieve with a flat sieve bottom is placed. The screen space above the sieve bottom is closed during a screening with a lid. Below the sieve bottom, the housing has a free space. In this space a rotatable about the vertical center axis of the screen slit nozzle is arranged. During a sieving, air is blown against the sieve bottom from below by the uniformly rotating slot nozzle. The jet of air blows out the meshes of the screen mesh and swirls up the screenings lying on the screen. The fines of the material to be screened are entrained by the air jet and transported through the screen fabric from top to bottom in the space below the sieve insert and discharged from there from the screening machine. The coarse fractions, which are larger than the mesh size of the respective sieve insert, can not pass through the sieve and remain on the sieve fabric after sieving.

Zur Bestimmung einer Korngrößenverteilung müssen mehrere Siebungen mit Sieben unterschiedlicher Maschenweite durchgeführt werden. Dazu wird der nach erfolgter Siebung auf dem Sieb zurückgebliebene Siebrückstand, weiteren Siebungen unterzogen. Nach jeder Siebung muss der Siebrückstand gewogen werden, um die Korngrößenverteilungskurve bestimmen zu können.To determine a particle size distribution, several sieves with sieves of different mesh sizes must be performed. For this purpose, the sieve residue remaining on the sieve after sieving is subjected to further sieving. After each screening, the sieve residue must be weighed to determine the grain size distribution curve.

Alternativ kann für jede Siebung Material neu eingewogen werden.Alternatively, material can be re-weighed for each sieving.

Stand der TechnikState of the art

In der Vergangenheit wurden Luftstrahlsiebe manuell bedient, in den letzten Jahren bestand ein Bestreben Analysensiebungen zu automatisieren und wesentliche Prozessparameter wie Probenmenge, Siebdauer, Luftmenge und Unterdruck automatisch zu erfassen und einzustellen. Aus dem Stand der Technik z.B. ist die Integration von Wägezellen, zur automatischen Erfassung der Probenmenge, in das Luftstrahlsieb bekannt. Außerdem ist bekannt eine Steuereinrichtung für Luftstrahlsiebe vorzusehen bei der als Eingangsgröße Maschenweite des Siebes, Materialeigenschaften der Probe und /oder Anwendungsbereich des Materials eingegeben werden aufgrund derer vorher definierte Siebungsparameter wie Unterdruck erfasst und geregelt werden und die Siebdauer vorbestimmt ist. So können Siebungen nach internen Prüfvorschriften durchgeführt werden und genaue reproduzierbare, automatisierte Analysen realisiert werden. Weiterhin können Siebmaschinen mit Sensoren ausgerüstet werden, welche die Maschenweite des eingesetzten Siebes automatisch identifizieren und eventuell zusätzliche Informationen in der Siebmaschine oder direkt am Sieb speichert um bei Analysen-Siebmaschinen allgemein die Analysensicherheit gegen Fehlbedienen zu erhöhen.In the past air jet screens have been manually operated, in recent years there has been a desire to automate analysis screens and to automatically detect and adjust key process parameters such as sample size, sieving time, air flow and vacuum. From the prior art e.g. is the integration of load cells, for automatically detecting the amount of sample, known in the air jet sieve. In addition, it is known to provide a control device for air jet sieves in which the input mesh size of the screen, material properties of the sample and / or application range of the material are entered on the basis of which previously defined screening parameters such as negative pressure are detected and regulated and the screening time is predetermined. Thus, screenings can be carried out according to internal test specifications and accurate, reproducible, automated analyzes can be realized. Furthermore, screening machines can be equipped with sensors which automatically identify the mesh size of the screen used and possibly store additional information in the screening machine or directly on the screen in order to generally increase the analysis reliability against incorrect operation in analytical screening machines.

Aus der EP 0 654 308 B1 ist die Messung und Regelung des Luftvolumenstromes bei Luftstrahlsieben bekannt. So kann der Gasstrom über den Verlauf des Siebvorganges konstant gehalten werden. Außerdem ist aus dieser Druckschrift die Erfassung der Partikelmenge im Abgasstrom und ein daraus abgeleitetes Abbruchkriterium für die Analyse bekannt. Vorgeschlagen wird die optische Erfassung des Partikelstroms.From the EP 0 654 308 B1 is the measurement and control of the air flow in air jet screens known. Thus, the gas flow over the course of the screening process can be kept constant. In addition, from this document the detection of the amount of particles in the exhaust stream and a derived termination criterion for the analysis is known. Proposed is the optical detection of the particle flow.

Aus der DE 100 22 391 A1 ist die Staubmessung in strömenden Gasen unter Verwendung des triboelektrischen Effekts bekannt. Es handelt sich hierbei um eine qualitative Staubmessung. Das Prinzip beruht auf dem Übergang von Ladungen, wenn zwei Körper durch Berührung oder Reibung miteinander in Kontakt gebracht werden. Die Ladungsdifferenz ist Grundlage für die triboelektrischen Messung. Hierdurch kann eine qualitative Überwachung der Staubkonzentration erfolgen und eine relative Zuordnung der Teilchenkonzentration erfolgen. Eine genaue Zuordnung des Messsignals zur Staubkonzentration ist nur in Fällen konstanter Geschwindigkeit möglich.From the DE 100 22 391 A1 For example, dust measurement in flowing gases is known using the triboelectric effect. It is a qualitative dust measurement. The principle is based on the transfer of charges when two bodies are brought into contact with each other by touch or friction. The charge difference is the basis for the triboelectric measurement. In this way, a qualitative monitoring of the dust concentration can take place and a relative allocation of the particle concentration can take place. An exact assignment The measuring signal for dust concentration is only possible in cases of constant speed.

Nachteilig bei der bereits bekannten optischen Methode ist die empfindliche und kostenintensive Messtechnik für die optische Erfassung der Partikelmenge im Abgasstrom, speziell bei abrasiven Produkten. Für diese optische Methode sind zwei Bauteile nämlich Sender und Empfänger notwendig. Diese werden mittels Glasscheiben von dem Partikelstrom abgegrenzt, das Glas muss staubfrei gehalten werden, was sehr aufwendig ist. Diese Maßnahmen bedingen ein großes Bauvolumen._Nachteilig bei vorgegebenen konstanten Siebzeiten, auch wenn sie sich für Siebe mit unterschiedlicher Siebmaschenweiten und unterschiedlichen Materialien unterscheiden, ist dass abhängig von der Siebmaschenweite das zu siebende Material unterschiedlich lange gesiebt wird, was z.B. bei nicht abriebfesten Stoffen zu unterschiedlicher Beanspruchung des Stoffes führt und zu einer Verfälschung des Messergebnisses.A disadvantage of the already known optical method is the sensitive and costly measurement technique for the optical detection of the amount of particles in the exhaust stream, especially in abrasive products. For this optical method two components namely transmitter and receiver are necessary. These are separated by means of glass panes of the particle flow, the glass must be kept dust-free, which is very expensive. These measures require a large Bauvolumen._Nachteilig given predetermined screen times, even if they differ for screens with different Siebmaschenweiten and different materials, is that depending on the Siebmaschenweite the material to be screened for different lengths sieved, which is e.g. for non-abrasion-resistant materials leads to different stress on the substance and to a falsification of the measurement result.

Der Erfindung liegt daher die Aufgabe zugrunde eine Lösung zu schaffen, die es ermöglicht den Siebfortschritt bei einer Siebung mit einem Luftstrahlsieb zu erfassen um die Siebdauer festzustellen.The invention is therefore an object of the invention to provide a solution that allows the sieve progress in a screening with an air jet sieve to determine the screening time.

Bei einem Luftstrahlsieb der eingangs beschriebenen Art wird die Aufgabe erfindungsgemäß dadurch gelöst, dass die Siebmaschine einen Messsonde aufweist, durch die Partikel in Strömungsrichtung nach dem Siebboden triboelektrisch detektierbar sind.In an air jet screen of the type described above, the object is achieved in that the screening machine has a measuring probe, are triboelectrically detectable by the particles in the flow direction after the sieve bottom.

Beschreibung der ErfindungDescription of the invention

Ein entscheidender Prozessparameter für die Siebung ist die Siebdauer. Die Siebdauer einer Siebung beeinflusst deren Trenngrenze und Trennschärfe. Idealerweise wird die Siebdauer so gewählt, dass nur noch Material, welches größer als die Siebmaschenweite ist, auf dem Sieb liegt, und somit kein Material im abgesaugten Luftstrom mehr vorhanden ist. Da das zu siebenden Material kein ideales Verhalten aufweist z. B. keine konstanten Probemengen verarbeitet werden, nicht abriebfest ist, klebrig ist, sich elektrostatisch auflädt, die Kornform von der Kugel abweicht, kann eine Siebung unendlich lange dauern. Die Siebdauer ist auch abgängig von der Maschenweite des gewählten Siebes. Die Siebdauer von Siebungen mit Sieben großer Maschenweite ist geringer als jene mit kleiner Maschenweite. Die Siebdauer darf nicht zu lang gewählt werden, da sonst empfindlichen Produkte zu stark beansprucht werden und es zu Zerkleinerungs- oder Abriebvorgängen während der Siebung kommt.
Vom wirtschaftlichen Gesichtspunkt soll die Siebdauer möglichst kurz sein, gleichzeitig sollten die Siebungen aber repräsentativ und wiederholbar sein. Erfindungsgemäß ist vorgesehen ein Luftstrahlsieb mit einer Messtechnik auszustatten, die es erlaubt den Siebfortschritt festzustellen und die Siebdauer einer Messung in Abhängigkeit vom Material und Siebmaschenweite reproduzierbar festzulegen.
Vorgesehen ist eine Staubmessung nach dem triboelektrischen Messprinzip. Die Messsonde wird in Strömungsrichtung nach dem Siebboden in das Luftstrahlsieb, beispielsweise in den Abluftkanal eingebaut. Durch diesen Abluftkanal strömt die Luft, die über die Schlitzdüse von unten nach oben den Siebboden passiert und auf ihrem Rückweg von oben nach unten durch den Siebboden Material, welches kleiner als die Maschenweite des Siebes ist, mitnimmt.
Die Partikel im Luftstrom erzeugen beim Kontakt mit der Messsonde durch Reibung ein Signal.A crucial process parameter for screening is the sieving time. The sieving time of a sieving influences its separation limit and selectivity. Ideally, the sieving time is chosen so that only material which is larger than the Siebmaschenweite, lying on the screen, and thus no material is present in the extracted air flow more. Since the material to be screened has no ideal behavior, for. B. no constant samples are processed, is not resistant to abrasion, is sticky, electrostatically charged, the grain shape deviates from the ball, a screening can take forever. The sieving time is too depending on the mesh size of the selected screen. The sieving time of screens with sieves of large mesh size is less than that with small mesh size. The sieving time must not be too long, as otherwise sensitive products are subjected to excessive stress and comminution or abrasion processes occur during sieving.
From the economic point of view, the sieving time should be as short as possible, but at the same time the screenings should be representative and repeatable. According to the invention, it is provided to equip an air-jet screen with a measuring technique which makes it possible to determine the progress of the sieve and to determine the sieving time of a measurement as a function of the material and sieve mesh size in a reproducible manner.
A dust measurement according to the triboelectric measuring principle is envisaged. The measuring probe is installed downstream of the sieve bottom in the air jet sieve, for example in the exhaust air duct. Through this exhaust air duct flows the air that passes through the slot nozzle from bottom to top of the sieve tray and on their way back from top to bottom through the sieve bottom material, which is smaller than the mesh size of the sieve entrains.
The particles in the air flow generate a signal when they come into contact with the probe due to friction.

Die Rohsignale an einer triboelektrischen Sonde sind sehr klein, da nur geringe Ladungsmengen übergehen und transportiert werden. Daher muss der Ladungsverstärker besonders hochohmig angekoppelt werden und einen hohen Verstärkungsfaktor aufweisen. Derartige Systeme sind anfällig gegen Einstreuung von Störsignalen. Daher sind die Sonde und der Verstärker mit möglichst kurzen und störsicheren Leitungen zu verbinden. Ideal ist es, auf Kabel zum Transport der triboelektrisch erzeugten Ladungen ganz zu verzichten und die Sonde und den Verstärker direkt zu verbinden. Als beispielhafte Ausführung wird die Leiterplatte des Verstärkers, welche sich ganz oder teilweise in einem abgeschirmten Gehäuse befindet direkt an der Sonde verschraubt.The raw signals on a triboelectric probe are very small, since only small amounts of charge are transferred and transported. Therefore, the charge amplifier must be coupled with particularly high impedance and have a high amplification factor. Such systems are prone to interference from interfering signals. Therefore, the probe and the amplifier should be connected with the shortest possible and interference-proof cables. It is ideal to completely dispense with cables for transporting the triboelectrically generated charges and to connect the probe and the amplifier directly. As an exemplary embodiment, the printed circuit board of the amplifier, which is wholly or partially in a shielded housing screwed directly to the probe.

Weiterhin ist jeder Einbau von Teilen wie Messsonden in eine Leitung, welche von einem Gas-Partikel-Gemisch durchströmt wird, mit Nachteilen wie Verschmutzung, Verschleiß und Störungen der Strömung verbunden. Zur Minimierung dieser Nachteile wird der ohnehin notwendige Sensorstab zur Messung des Druckes isoliert befestigt und so mit der triboelektrischen Sonde kombiniert.Furthermore, every installation of parts such as measuring probes in a line, which is traversed by a gas-particle mixture, with disadvantages such as pollution, wear and disturbances of the flow is connected. To minimize this Disadvantages of the already necessary sensor rod for measuring the pressure is isolated and thus combined with the triboelectric probe.

Der triboelektrische Sonde lässt sich an jeder Stelle im Luftstrahlsieb in Strömungsrichtung nach dem Siebbodens integrieren, nämlich überall dort wo nach der Siebung der Partikel-Luftstrom an einer Fläche entlang strömt. Die Sonde kann auch als flächiges Element am Boden oder der Wand des Raumes unterhalb des Siebbodens ausgebildet sein.
In einer anderen Ausgestaltungsform kann der triboelektrische Sensor in die Schlitzdüse integriert werden.The triboelectric probe can be integrated at any point in the air jet screen in the flow direction downstream of the sieve bottom, namely wherever the particle air flow flows along a surface after sieving. The probe can also be designed as a planar element on the bottom or the wall of the space below the sieve bottom.
In another embodiment, the triboelectric sensor can be integrated into the slot nozzle.

Dieses qualitative Signal der triboelektrischen Sonde wird zeitabhängig aufgenommen und lässt sich mit dem Siebfortschritt korrelieren. Der Verlauf des Signals wird zur Feststellung der Siebdauer genutzt.This qualitative signal of the triboelectric probe is recorded time-dependent and can be correlated with the sieve progress. The course of the signal is used to determine the sieving time.

Siebungen lassen sich so wirtschaftlich durchführen, da die Siebdauer jeder Siebung dem Material und den Siebbedingungen angepasst ist. Der Einsatz des triboelektrischen Messprinzips zur Detektion der Partikel im Abluftstrom stellt ein wirtschaftliches Messverfahren dar. Die Messsonde ist einfach im Aufbau, hat ein geringes Bauvolumen und ist unempfindlich gegen Verschmutzung und Verschleiß.Sieving can be carried out so economically, since the screening time of each screening is adapted to the material and the screening conditions. The use of the triboelectric measuring principle for the detection of particles in the exhaust air flow represents an economical measuring method. The measuring probe is simple in construction, has a low construction volume and is insensitive to contamination and wear.

Schließlich zeichnet sich die Erfindung noch durch ein Verfahren zum Betreiben des Luftstrahisiebs aus, bei welchem die Partikel im Abluftstrom detektiert werden und mit dem Siebfortschritt korreliert werden. Die Detektierung der Partikel im Abluftstrom erfolgt nach dem triboelektrischen Prinzip. Das qualitative Messsignal der triboelektrischen Sonde wird dafür über der Zeit aufgenommen und der Verlauf des Signals wird zur Feststellung der Siebdauer genutzt. Dabei kommt ein Luftstrahlsieb nach den Ansprüchen 1 bis 5 zum Einsatz.Finally, the invention is characterized by a method for operating the Luftstrahisiebs, in which the particles are detected in the exhaust air flow and correlated with the Siebfortschritt. The detection of the particles in the exhaust air flow takes place according to the triboelectric principle. The qualitative measurement signal of the triboelectric probe is recorded over time and the course of the signal is used to determine the screening time. In this case, an air jet screen according to claims 1 to 5 is used.

Figur 1 zeigt das Luftstrahlsieb mit Messsonde in der Schnittdarstellung FIG. 1 shows the air jet sieve with probe in the sectional view

In der Figur 1 ist das Luftstrahlsieb 1 in einer Schnittdarstellung zu sehen. Das Gehäuse 2 umschließt den Antriebsmotor 3 und das Getriebe 4 mit Antriebswelle 5 für die Schlitzdüse 6. Das Gehäuse 2 bildet zusammen mit dem Siebboden 8 den Raum 9 unterhalb des Siebbodens 8 in dem die Schlitzdüse 6 angeordnet ist. Der Siebraum 10 wird durch den Siebboden 8 und den Deckel 11 begrenzt. Der Deckel 11 weist einen Griff 12 zum manuellen Öffnen und Verschließen des Siebraumes 10 auf. Das Sieb 7 besteht aus einer ringförmigen Tragstruktur 13, in die der Siebboden 8 eingespannt ist. Die Tragstruktur 13 des Siebes ist lose in das Gehäuse 2 eingesetzt und wird durch einen kegelförmigen Absatz innerhalb des Gehäuses 2 zentriert. Über den Zuluftkanal 14 wird Luft in die Schlitzdüse 6 eingebracht und von unten gegen den Siebboden 8 geblasen. Die in den Raum 9 zusammen mit dem Feinanteil eintretende Luft wird über den Abluftkanal 15 aus dem Gehäuse 2 abgesaugt.
In dem Abluftkanal 15 ist die Messsonde 16 für die triboelektrische Staubmessung und ein Teil der Einrichtung zur Differenzdruckmessung zwischen Ansaugöffnung und Absaugung angeordnet.In the FIG. 1 the air jet screen 1 can be seen in a sectional view. The housing 2 surrounds the drive motor 3 and the transmission 4 with drive shaft 5 for the slot nozzle 6. The housing 2 forms together with the sieve plate 8 the Room 9 below the sieve tray 8 in which the slot nozzle 6 is arranged. The sieve space 10 is limited by the sieve bottom 8 and the lid 11. The lid 11 has a handle 12 for manually opening and closing the screen space 10. The sieve 7 consists of an annular support structure 13, in which the sieve plate 8 is clamped. The support structure 13 of the screen is loosely inserted into the housing 2 and is centered by a conical shoulder within the housing 2. Air is introduced into the slot nozzle 6 via the supply air duct 14 and blown from below against the sieve bottom 8. The entering into the space 9 together with the fines air is sucked through the exhaust duct 15 from the housing 2.
In the exhaust duct 15, the measuring probe 16 for the triboelectric dust measurement and a part of the device for differential pressure measurement between the intake and exhaust is arranged.

Ebenfalls in das Gehäuse integriert ist das Bedienpult 17. Es weist ein Tastaturfeld auf, über welches alle erforderlichen Eingaben gemacht werden können. Anstelle der Tastatur kann ein Touchpanel oder ein Drehknopf zum Einsatz kommen. Eine Datenschnittstelle zu einem Rechner kann ebenfalls vorgesehen werden.Also integrated in the housing is the control panel 17. It has a keypad, over which all required inputs can be made. Instead of the keyboard, a touch panel or a rotary knob can be used. A data interface to a computer can also be provided.

Im Gehäuse 2 ist die Auswerteelektronik für die Staubmessung und die Ermittlung des Siebfortschrittes sowie der Bestimmung der Siebzeit integriert.In the housing 2, the evaluation for the dust measurement and the determination of Siebforschrittes and the determination of the screening time is integrated.

Die im Abluftkanal 15 eingebaute triboelektrischen Sonde 16 ist mit dem Verstärker mit möglichst kurzen und störsicheren Leitungen verbunden. In einer anderen Ausgestaltung der Erfindung wird auf Kabel zum Transport der triboelektrisch erzeugten Ladungen ganz verzichtet und die Sonde und den Verstärker direkt verbunden. Als beispielhafte Ausführung wird die Leiterplatte des Verstärkers, welche sich ganz oder teilweise in einem abgeschirmten Gehäuse befindet direkt an der Sonde verschraubt.The built-in exhaust air duct 15 triboelectric probe 16 is connected to the amplifier with the shortest possible and fail-safe lines. In another embodiment of the invention is dispensed with cables for transporting the triboelectrically generated charges completely and the probe and the amplifier connected directly. As an exemplary embodiment, the printed circuit board of the amplifier, which is wholly or partially in a shielded housing screwed directly to the probe.

Der triboelektrische Sensor 16 lässt sich an jeder Stelle in Strömungsrichtung nach dem Siebboden 8 in das Luftstrahlsieb, z.B. dem Abluftkanal 15 oder in einer Verbindungsleitung zum nachgeschalteren Filter integrieren, nämlich überall dort wo nach der Siebung der Partikel-Luftstrom an einer Fläche entlang strömt. Die Sonde kann auch als flächiges Element am Boden und/oder der Wand des Raumes unterhalb des Siebbodens 8 ausgebildet sein.
In einer anderen Ausgestaltungsform kann der triboelektrische Sensor in die Schlitzdüse 6 integriert werden.The triboelectric sensor 16 can be integrated at any point in the flow direction after the sieve plate 8 in the air jet sieve, eg the exhaust duct 15 or in a connecting line to the downstream filter, namely everywhere where after the screening of the particle air flow flows along a surface. The probe can also be formed as a planar element on the floor and / or the wall of the room below the sieve plate 8.
In another embodiment, the triboelectric sensor can be integrated into the slot nozzle 6.

In einer bevorzugten Ausgestaltung der Erfindung wird der für die Druckmessung erforderliche Sensor isoliert im Abluftkanal 15 befestigt und auch als triboeletrische Sonde verwendet.In a preferred embodiment of the invention, the required for the pressure measurement sensor is isolated in the exhaust duct 15 and also used as a tribo-electric probe.

Das triboelektrische Messsignal wird über der Zeit aufgenommen, aus seinem Verlauf wird der Siebfortschritt abgelesen und die Siebdauer festgelegt.The triboelectric measurement signal is recorded over time, the progress of the sieve is read from its course and the sieving time is determined.

Bezugszeichenreference numeral

  1. 1. Luftstrahlsieb1. air jet sieve
  2. 2. Gehäuse2nd case
  3. 3. Antriebsmotor3rd drive motor
  4. 4. Getriebe4. Transmission
  5. 5. Antriebswelle5. Drive shaft
  6. 6. Schlitzdüse6. Slot nozzle
  7. 7. Sieb7. Sieve
  8. 8. Siebboden8. sieve bottom
  9. 9. Raum9th room
  10. 10. Siebraum10. Screen room
  11. 11. Deckel11. Lid
  12. 12. Griff12. Handle
  13. 13. Griff13. Handle
  14. 14. Zuluftkanal14. Supply air duct
  15. 15. Abluftkanal15. exhaust duct
  16. 16. triboelekfrische Messsonde16. triboelekfrische probe
  17. 17. Bedienpult17. Control panel

Claims (9)

  1. Air jet sieve (1) with housing (2) and at least one sieve (7) which can be inserted into the housing (2), with a slotted nozzle (6) underneath the sieve deck (8), a drive for the slotted nozzle (6), an air supply for the slotted nozzle (6) as well as an air outlet duct leading through the housing (2) and out of the space (9) underneath the sieve deck (8), and a control unit which controls operation of the thus-formed sieving machine, characterised in that the sieving machine is equipped with a measuring sensor (16) which permits triboelectric detection of the particles in the air flow.
  2. Air jet sieve (1) in accordance with Claim 1, characterised in that the measuring sensor (16) is located downstream of the sieve deck (8) and upstream of the downstream filter in the direction of flow of the particle-air stream.
  3. Air jet sieve (1) in accordance with Claim 1, characterised in that the measuring sensor (16) is located in the air outlet duct (15).
  4. Air jet sieve (1) in accordance with Claims 1 and 2, characterised in that the triboelectric measuring sensor (16) is designed such that it is linked to the pressure sensor for measuring the underpressure.
  5. Air jet sieve (1) in accordance with Claim 1, characterised in that the triboelectric measuring sensor (16) is located on the floor and/or wall of the space (9) underneath the sieve deck (8).
  6. Air jet sieve (1) in accordance with Claim 1, characterised in that the triboelectric measuring sensor (16) is integrated into the slotted nozzle (6).
  7. Air jet sieve (1) in accordance with one or more of Claims 1 to 6, characterised in that transmission of the measuring signal from the triboelectric measuring sensor (16) to the printed circuit board is wireless.
  8. Method of operating an air jet sieve (1) for the particle size analysis of a material sample, with housing (2) and at least one sieve (7) which can be inserted into the housing (2), with a slotted nozzle (6) underneath the sieve deck (8), a drive for the slotted nozzle (6), an air supply for the slotted nozzle (6) as well as an air outlet duct leading through the housing (2) and out of the space (9) underneath the sieve deck (8), and a control unit which controls operation of the thus-formed sieving machine,
    characterised in that the particles in the particle-air flow are detected in flow direction downstream of the sieve deck (8), are correlated with the sieving progress, as a result of which the sieving time is determined, whereby detection of the particles in the outlet air stream is in accordance with the triboelectric measuring principle.
  9. Method in accordance with Claim 8, characterised in that the measuring signal of the triboelectric measuring sensor (16) is plotted over time and the gradient of the signal is used as a basis for determining the sieving duration.
EP11002770.3A 2010-04-17 2011-04-02 Air jet sieve Not-in-force EP2384823B1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102010015364A DE102010015364B4 (en) 2010-04-17 2010-04-17 Air Jet Sieve

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EP2384823A1 EP2384823A1 (en) 2011-11-09
EP2384823B1 true EP2384823B1 (en) 2015-12-02

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US (1) US8678196B2 (en)
EP (1) EP2384823B1 (en)
JP (1) JP2011224561A (en)
CN (1) CN102240639A (en)
DE (1) DE102010015364B4 (en)

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US20110253601A1 (en) 2011-10-20
DE102010015364B4 (en) 2013-06-27
JP2011224561A (en) 2011-11-10
DE102010015364A1 (en) 2011-10-20
EP2384823A1 (en) 2011-11-09
CN102240639A (en) 2011-11-16
US8678196B2 (en) 2014-03-25

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