DE4441350C1 - Infrared spectroscopic measuring system for moisture content of materials in mixer and dryer plant - Google Patents

Infrared spectroscopic measuring system for moisture content of materials in mixer and dryer plant

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Publication number
DE4441350C1
DE4441350C1 DE4441350A DE4441350A DE4441350C1 DE 4441350 C1 DE4441350 C1 DE 4441350C1 DE 4441350 A DE4441350 A DE 4441350A DE 4441350 A DE4441350 A DE 4441350A DE 4441350 C1 DE4441350 C1 DE 4441350C1
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DE
Germany
Prior art keywords
sensor
viewing window
measuring device
moisture content
flushing
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Fee Related
Application number
DE4441350A
Other languages
German (de)
Inventor
Klaus-Juergen Prof Dr Steffens
Klaus-Ulrich Dipl Ing List
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
BOHLE L B PHARMATECH GmbH
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BOHLE L B PHARMATECH GmbH
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Priority to DE4441350A priority Critical patent/DE4441350C1/en
Application granted granted Critical
Publication of DE4441350C1 publication Critical patent/DE4441350C1/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F26—DRYING
    • F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
    • F26B25/00—Details of general application not covered by group F26B21/00 or F26B23/00
    • F26B25/22—Controlling the drying process in dependence on liquid content of solid materials or objects
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F26—DRYING
    • F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
    • F26B11/00—Machines or apparatus for drying solid materials or objects with movement which is non-progressive
    • F26B11/12—Machines or apparatus for drying solid materials or objects with movement which is non-progressive in stationary drums or other mainly-closed receptacles with moving stirring devices
    • F26B11/14—Machines or apparatus for drying solid materials or objects with movement which is non-progressive in stationary drums or other mainly-closed receptacles with moving stirring devices the stirring device moving in a horizontal or slightly-inclined plane
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F26—DRYING
    • F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
    • F26B5/00—Drying solid materials or objects by processes not involving the application of heat
    • F26B5/04—Drying solid materials or objects by processes not involving the application of heat by evaporation or sublimation of moisture under reduced pressure, e.g. in a vacuum
    • F26B5/048—Drying solid materials or objects by processes not involving the application of heat by evaporation or sublimation of moisture under reduced pressure, e.g. in a vacuum in combination with heat developed by electro-magnetic means, e.g. microwave energy
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
    • G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
    • G01N21/25—Colour; Spectral properties, i.e. comparison of effect of material on the light at two or more different wavelengths or wavelength bands
    • G01N21/31—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry
    • G01N21/35—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry using infrared light
    • G01N21/3554—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry using infrared light for determining moisture content

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Spectroscopy & Molecular Physics (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Health & Medical Sciences (AREA)
  • Chemical & Material Sciences (AREA)
  • Molecular Biology (AREA)
  • Analytical Chemistry (AREA)
  • Biochemistry (AREA)
  • General Health & Medical Sciences (AREA)
  • General Physics & Mathematics (AREA)
  • Immunology (AREA)
  • Pathology (AREA)
  • Investigating Or Analysing Materials By Optical Means (AREA)

Abstract

Moisture content of material in a granulator mixer and vacuum drying equipment is measured by an infra-red spectroscopic device with a measuring sensor (6) with fibre optic, extending into the material down to the top edge of the stirrer blade and equipped with a viewing window (8) at an angle to the longitudinal axis of the fibre optic. The end of the fibre optic away from the window leads to a detector. A flushing gas nozzle (10) may be provided in the region of the window, at the end of a flushing probe (11) located within the sensor.

Description

Die Erfindung bezieht sich auf eine infrarotspektroskopische Meßvorrichtung für einen Mischgranulator und Vakuumtrock­ ner gemäß dem Hauptanspruch.The invention relates to an infrared spectroscopic Measuring device for a mixing granulator and vacuum dryer ner according to the main claim.

Mischgranulatoren und Trockner, insbesondere zur Erzeugung pharmazeutischer Produkte sind in großem Umfang im Einsatz. Das Trocknen der in dem Mischgranulator enthaltenen Produkte erfolgt üblicherweise durch ein Wirbelbettverfahren, und in jüngster Zeit sind auch mit Mikrowellen arbeitende Vakuum­ trockner bekanntgeworden, die gegenüber den Wirbelbettver­ fahren erhebliche Vorteile besitzen. Schwierigkeiten bereitet bei den Mikrowellen-Vakuumtrockner die genaue Bestimmung des Feuchtigkeitsgehaltes der zu behandelnden Produkte, wobei durch den Feuchtigkeitsgehalt gleichzeitig auch der Lösungs­ mittelgehalt der Produkte bestimmt wird.Mixing granulators and dryers, in particular for production pharmaceutical products are widely used. Drying the products contained in the mixing granulator usually done by a fluidized bed process, and in Most recently there are also vacuum working with microwaves dryer has become known, compared to the fluidized bed ver driving have significant advantages. Creates difficulties the microwave vacuum dryer the exact determination of the Moisture content of the products to be treated, wherein due to the moisture content also the solution medium content of the products is determined.

Der Erfindung liegt die Aufgabe zugrunde, eine Meßvorrichtung für derartige Mischgranulatoren und Vakuumtrockner zu schaffen, wobei davon ausgegangen wird, daß infrarotspek­ troskopische (NIR) Meßeinrichtungen zur Feuchtigkeits­ messung im Prinzip bekannt sind (z. B. aus EP 0 323 552 A2).The invention has for its object a measuring device for such mixing granulators and vacuum dryers create, it is assumed that infrared spec Troscopic (NIR) measuring devices for moisture measurement are known in principle (e.g. from EP 0 323 552 A2).

Diese der Erfindung zugrundeliegende Aufgabe wird durch die Lehre des Hauptanspruches gelöst.This object of the invention is achieved by Teaching of the main claim solved.

Vorteilhafte Ausgestaltungen sind in den Unteransprüchen er­ läutert. Advantageous embodiments are in the subclaims purifies.  

Mit anderen Worten ausgedrückt wird vorgeschlagen, beispielsweise an der Decke des Mischbehälters einen Meßfühler anzuordnen, der an seinem unteren Ende mit einem Sichtfenster ausgerüstet ist, wobei dieses untere Ende tief in das Produkt innerhalb des Misch­ behälters reicht und vorzugsweise kurz oberhalb der Oberkante des Rührflügels endet. Hinter dem Sicht­ fenster befindet sich die Mündung eines Lichtleiters, der zu einem Detektor führt, wobei das Sichtfenster im Winkel zur Längsachse des Lichtleiters steht, um somit Reflexionen von der Rückseite des Fensters in den Lichtleiter zu vermeiden.In other words, it is suggested for example on the ceiling of the mixing container Arrange the sensor with at its lower end a viewing window is equipped, this lower end deep into the product within the mix container is sufficient and preferably just above the The upper edge of the impeller ends. Behind the view window is the mouth of a light guide, which leads to a detector, the viewing window is at an angle to the longitudinal axis of the light guide hence reflections from the back of the window to avoid in the light guide.

Durch diese Anordnung kann also nunmehr kontinuier­ lich der Feuchtigkeitsgehalt des Produktes gemessen werden, wobei dadurch, daß das Sichtfenster sich im bewegten Bereich des Produktes, d. h. in grober Nähe zum Rührflügel befindet, erreicht wird, daß das Sichtfenster ständig mit neuem Produkt bestrichen wird und dadurch von Verkrustungen und Verunreini­ gungen freigehalten wird.This arrangement can now be used continuously Lich measured the moisture content of the product be, in that the viewing window is in moving area of the product, d. H. in close proximity to the impeller is achieved that Window always coated with new product and thus of incrustations and impurities conditions are kept free.

Sollten trotzdem einmal sehr klebende und anhaftende Produkte verarbeitet werden, wird zum Freihalten des Sichtfensters weiterhin vorgeschlagen, daß in un­ mittelbarer Nähe des Sichtfensters eine Spüldüse mündet, die impulsweise ein Spülgas auf das Sicht­ fenster sprüht und dadurch sicherstellt, daß ggf. anhaftende Partikelchen abgesprüht werden, und andererseits aber auch sicherstellt, daß immer wieder zu behandelndes Produkt in unmittelbarer Nähe des Sichtfensters vorbeigeführt wird. Vorzugs­ weise befindet sich gemäß der Erfindung die zur Spüldüse führende Spülsonde ebenfalls im Meßfühler, wobei weiterhin der Meßfühler auch noch einen Temperaturfühler aufweisen kann.Should still be very sticky and adhesive Products processed are used to keep the Viewing window further suggested that in un a rinsing nozzle in the immediate vicinity of the viewing window flows, which impulses a purge gas on the view spraying window and thereby ensures that if necessary adhering particles are sprayed, and on the other hand also ensures that again and again treating product in the immediate vicinity of the Viewing window is passed. Preferential as is according to the invention Flushing probe guiding flushing nozzle also in the sensor, and the sensor also has one May have temperature sensors.

Ein Ausführungsbeispiel der Erfindung wird nach­ folgend anhand der Zeichnungen erläutert.An embodiment of the invention will follow explained below with reference to the drawings.

Die Zeichnungen zeigen dabei inThe drawings show in

Fig. 1 eine schematische Ansicht einer An­ ordnung eines Mischgranulators und Vakuumtrockners und in Fig. 1 is a schematic view of an arrangement of a mixing granulator and vacuum dryer and in

Fig. 2 in größerem Maßstab das untere Ende des in den Granulator hineinreichen­ den Meßfühlers. Fig. 2 on a larger scale the lower end of the probe extending into the granulator.

In Fig. 1 ist mit 1 ein Mischbehälter bezeichnet, in dem ein Rührwerksflügel 2 erkennbar ist, der von einem Antriebsmotor 3 angetrieben wird. An der Ober­ seite des Mischbehälters 1 sind Mikrowellenerzeuger 4 und 5 vorgesehen und durch die Oberseite des Mischbehälters 1 ist ein Meßfühler 6 in das Innere des Mischbehälters 1 geführt, wobei dieser Meßfühler 6 in unmittelbarer Nähe der Oberkante des Rührwerk­ flügels 2 endet. Die in den Meßfühler 6 reichende Lichtleitung ist mit 7 bezeichnet und bei 9 ist ein Detektor angedeutet, der nunmehr die Meßergebnisse auswertet und liefert. Weiterhin ist an der Ober­ seite des Mischbehälters 1 eine Absauggasleitung 14 vorgesehen, die durch einen Produktfilter 15 zu einem Kondensator 16 führt, in dem ggf. im Gas befind­ liche Feuchtigkeit abgeschieden und in einem Konden­ satsammelbehälter 17 gesammelt wird. Bei 18 ist ein Temperatiergerät eingezeichnet, das über zwei Leitungen mit der Wandung des Mischbehälters 1 in Verbindung steht und für eine gleichmäßige Tempera­ tur der Behälterwandung Sorge trägt.In Fig. 1, 1 denotes a mixing container in which an agitator blade 2 can be seen, which is driven by a drive motor 3 . On the upper side of the mixing container 1 microwave generators 4 and 5 are provided and through the top of the mixing container 1 , a sensor 6 is guided into the interior of the mixing container 1 , this sensor 6 ends in the immediate vicinity of the upper edge of the agitator wing 2 . The light line reaching into the sensor 6 is designated by 7 and a detector is indicated at 9 , which now evaluates and delivers the measurement results. Furthermore, a suction gas line 14 is provided on the upper side of the mixing container 1 , which leads through a product filter 15 to a condenser 16 , in which moisture possibly present in the gas is deposited and sats collecting container 17 is collected in a condenser. At 18 , a temperature control device is shown, which is connected to the wall of the mixing container 1 via two lines and ensures a uniform temperature of the container wall.

In Fig. 2 ist das untere Ende des Meßfühlers 6 in größerem Maßstab dargestellt. In dem Meßfühler 6 ist der Lichtleiter 7 erkennbar, der kurz vor dem Ende des Meßfühlers 6 endet, wobei in diesem Bereich der Meßfühler durch ein Sichtfenster 8 abgeschlossen ist, das in einem Winkel zur Längsachse des Licht­ leiters 7 steht, so daß reflektierende Strahlen nicht in den Lichtleiter 7 zurückgeleitet werden.In Fig. 2 the lower end of the sensor 6 is shown on a larger scale. In the sensor 6 , the light guide 7 can be seen , which ends shortly before the end of the sensor 6 , in which area the sensor is completed by a viewing window 8 , which is at an angle to the longitudinal axis of the light guide 7 , so that reflecting rays are not be returned to the light guide 7 .

Weiterhin ist in Fig. 2 neben dem Lichtleiter 7 innerhalb des Meßfühlers 6 eine Spülsonde 11 er­ kennbar, die eine Spülgasdüse 10 besitzt, die un­ mittelbar gegenüber dem Sichtfenster 8 angeordnet ist, wobei die Spülsonde 11 mit einer Spülgas­ leitung 12 in Verbindung steht.Furthermore, in Fig. 2 in addition to the light guide 7 within the sensor 6, a flushing probe 11 he recognizable, which has a flushing gas nozzle 10 which is arranged un directly opposite the viewing window 8 , the flushing probe 11 being connected to a flushing gas line 12 .

Da sich der Meßfühler 6 mit seinem Sichtfenster 8 tief im Produkt dem Mischbehälters 1 befindet, kann es vorkommen, daß sich das Sichtfenster 8 zusetzt und zu diesem Zweck wird dann impulsweise die Spül­ gasdüse 10 betrieben, die immer wieder ein Frei­ spülen des Sichtfensters 8 erreicht, aber gleich­ zeitig auch sicherstellt, daß in den Impulsinter­ vallen das Sichtfenster 8 unmittelbar mit dem zu messenden Produkt in Kontakt kommt.Since the sensor 6 with its viewing window 8 is deep in the product of the mixing container 1 , it can happen that the viewing window 8 clogs and for this purpose the flushing gas nozzle 10 is then operated, which always flushes the viewing window 8 freely , but at the same time also ensures that the viewing window 8 comes into direct contact with the product to be measured in the pulse intervals.

Claims (5)

1. Infrarotspektroskopische Meßvorrichtung für einen mit einem Rührwerk ausgerüsteten Mischgranulator und Vakuumtrockner zur Messung der Feuchtigkeit des Mischgutes mit einem mit einem Lichtleiter (7) ausge­ rüsteten Meßfühler (6), der in den Mischbehälter (1) des Mischgranulators und Vakuumtrockners in das Mischgut bis an die Oberkante des Rührwerkflügels (2) reicht und mit einem Sichtfenster (8) ausgerüstet ist, das im Winkel zur Längsachse des Lichtleiters (7) steht, wobei das dem Sichtfenster (8) abgewandte Ende des Lichtleiters (7) zu einem Detektor (9) führt.1. Infrared spectroscopic measuring device for a mixing granulator equipped with a stirrer and vacuum dryer for measuring the moisture of the mixed material with a sensor ( 6 ) equipped with an optical fiber ( 7 ), which in the mixing container ( 1 ) of the mixing granulator and vacuum dryer into the mixed material up to the upper edge of the agitator blade ( 2 ) extends and is equipped with a viewing window ( 8 ) which is at an angle to the longitudinal axis of the light guide ( 7 ), the end of the light guide ( 7 ) facing away from the viewing window ( 8 ) leading to a detector ( 9 ) leads. 2. Meßvorrichtung nach Anspruch 1, gekennzeichnet durch eine Spülgasdüse (10) im Bereich des Sichtfensters (8).2. Measuring device according to claim 1, characterized by a flushing gas nozzle ( 10 ) in the region of the viewing window ( 8 ). 3. Meßvorrichtung nach Anspruch 2, dadurch ge­ kennzeichnet, daß die Spülgasdüse (10) am Endbereich einer innerhalb des Meßfühlers (6) gelagerten Spül­ sonde (11) angeordnet ist.3. Measuring device according to claim 2, characterized in that the flushing gas nozzle ( 10 ) is arranged at the end region of a flushing probe ( 11 ) mounted inside the sensor ( 6 ). 4. Meßvorrichtung nach Anspruch 2 oder 3, dadurch ge­ kennzeichnet, daß die Spülgasdüse (10) impulsweise mit Spülgas betreibbar ist.4. Measuring device according to claim 2 or 3, characterized in that the flushing gas nozzle ( 10 ) can be operated in pulses with flushing gas. 5. Meßvorrichtung nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, daß der Meß­ fühler (6) zusätzlich einen Temperaturfühler aufweist.5. Measuring device according to one of the preceding claims, characterized in that the measuring sensor ( 6 ) additionally has a temperature sensor.
DE4441350A 1994-11-21 1994-11-21 Infrared spectroscopic measuring system for moisture content of materials in mixer and dryer plant Expired - Fee Related DE4441350C1 (en)

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DE4441350A DE4441350C1 (en) 1994-11-21 1994-11-21 Infrared spectroscopic measuring system for moisture content of materials in mixer and dryer plant

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Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2000001521A1 (en) * 1998-07-06 2000-01-13 Exxon Chemical Patents Inc. Apparatus and method for dewatering an elastomeric polymer
WO2001070195A2 (en) * 2000-03-21 2001-09-27 Mars, Incorporated A method and apparatus for coating centers
WO2003093744A1 (en) * 2002-05-02 2003-11-13 Rosenmund Vta Ag Drying method
WO2006040000A1 (en) * 2004-10-09 2006-04-20 Sanofi-Aventis Deutschland Gmbh Dryer and method for controlling a dryer
WO2007115965A1 (en) * 2006-04-10 2007-10-18 F. Hoffmann-La Roche Ag Apparatus for monitoring freeze-drying process
WO2008019429A1 (en) * 2006-08-14 2008-02-21 Grain Foods Crc Ltd Methods and apparatus for measuring water absorbance in multi-phase systems
WO2008058624A1 (en) * 2006-11-14 2008-05-22 Fima Maschinenbau Gmbh Centrifuge dryer with improved nir-spectroscopy
CN100458411C (en) * 2006-07-24 2009-02-04 中国林业科学研究院木材工业研究所 Establishment of chemical composition content model in plant fiber material and content determining method
EP2508252A1 (en) * 2009-12-03 2012-10-10 Kabushiki Kaisha Powrex Coating apparatus
WO2014121405A1 (en) * 2013-02-06 2014-08-14 Ammann Schweiz Ag Mixer for producing concrete and method for operating the mixer
CN105056805A (en) * 2015-08-12 2015-11-18 吴江佳亿电子科技有限公司 Automatic vacuum stirring device capable of realizing cleaning
CN109631533A (en) * 2018-12-13 2019-04-16 温州医科大学 Chinese medicine dryer and its furnace drying method based on the stirring of S-shaped paddle
DE102018102571A1 (en) * 2018-02-06 2019-08-08 Blue Ocean Nova AG Process probe arrangement with collecting attachment and collection attachment

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0323552A2 (en) * 1987-11-05 1989-07-12 Abb Process Automation Inc. Apparatus and methods employing infrared absorption means to measure the moisture content of heavy grades of paper
EP0453797A2 (en) * 1990-04-26 1991-10-30 Yokogawa Electric Corporation Infrared ray moisture meter
EP0520322A1 (en) * 1991-06-28 1992-12-30 Krieg, Gunther, Prof.Dr.Ing. Method and apparatus for investigating the gas content of returned drink bottles

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0323552A2 (en) * 1987-11-05 1989-07-12 Abb Process Automation Inc. Apparatus and methods employing infrared absorption means to measure the moisture content of heavy grades of paper
EP0453797A2 (en) * 1990-04-26 1991-10-30 Yokogawa Electric Corporation Infrared ray moisture meter
EP0520322A1 (en) * 1991-06-28 1992-12-30 Krieg, Gunther, Prof.Dr.Ing. Method and apparatus for investigating the gas content of returned drink bottles

Cited By (23)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6517335B1 (en) 1998-07-06 2003-02-11 Exxon Chemical Patents Inc. Apparatus dewatering an elastomeric polymer
WO2000001521A1 (en) * 1998-07-06 2000-01-13 Exxon Chemical Patents Inc. Apparatus and method for dewatering an elastomeric polymer
WO2001070195A2 (en) * 2000-03-21 2001-09-27 Mars, Incorporated A method and apparatus for coating centers
WO2001070195A3 (en) * 2000-03-21 2002-03-21 Mars Inc A method and apparatus for coating centers
US7320808B2 (en) 2000-03-21 2008-01-22 Mars Incorporated Method and apparatus for coating confectionery centers
US7219442B2 (en) 2002-05-02 2007-05-22 Rosenmund Vtz Ag Drying method
WO2003093744A1 (en) * 2002-05-02 2003-11-13 Rosenmund Vta Ag Drying method
CH695427A5 (en) * 2002-05-02 2006-05-15 Rosenmund Vta Ag Drying process.
WO2006040000A1 (en) * 2004-10-09 2006-04-20 Sanofi-Aventis Deutschland Gmbh Dryer and method for controlling a dryer
DE102004049241A1 (en) * 2004-10-09 2006-04-20 Sanofi-Aventis Deutschland Gmbh Dryers and method for controlling a dryer
US7627959B2 (en) 2004-10-09 2009-12-08 Sanofi-Aventis Deutschland Gmbh Centrifugal dryer and methods for the control thereof
US7765713B2 (en) 2006-04-10 2010-08-03 Hoffmann-La Roche Inc. Water vapor monitoring apparatus
WO2007115965A1 (en) * 2006-04-10 2007-10-18 F. Hoffmann-La Roche Ag Apparatus for monitoring freeze-drying process
CN100458411C (en) * 2006-07-24 2009-02-04 中国林业科学研究院木材工业研究所 Establishment of chemical composition content model in plant fiber material and content determining method
WO2008019429A1 (en) * 2006-08-14 2008-02-21 Grain Foods Crc Ltd Methods and apparatus for measuring water absorbance in multi-phase systems
WO2008058624A1 (en) * 2006-11-14 2008-05-22 Fima Maschinenbau Gmbh Centrifuge dryer with improved nir-spectroscopy
EP2508252A1 (en) * 2009-12-03 2012-10-10 Kabushiki Kaisha Powrex Coating apparatus
EP2508252A4 (en) * 2009-12-03 2014-01-15 Powrex Kk Coating apparatus
US8671877B2 (en) 2009-12-03 2014-03-18 Kabushiki Kaisha Powrex Coating apparatus
WO2014121405A1 (en) * 2013-02-06 2014-08-14 Ammann Schweiz Ag Mixer for producing concrete and method for operating the mixer
CN105056805A (en) * 2015-08-12 2015-11-18 吴江佳亿电子科技有限公司 Automatic vacuum stirring device capable of realizing cleaning
DE102018102571A1 (en) * 2018-02-06 2019-08-08 Blue Ocean Nova AG Process probe arrangement with collecting attachment and collection attachment
CN109631533A (en) * 2018-12-13 2019-04-16 温州医科大学 Chinese medicine dryer and its furnace drying method based on the stirring of S-shaped paddle

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