DE435171C - Method for determining the degree of grinding of grist - Google Patents
Method for determining the degree of grinding of gristInfo
- Publication number
- DE435171C DE435171C DEB118038D DEB0118038D DE435171C DE 435171 C DE435171 C DE 435171C DE B118038 D DEB118038 D DE B118038D DE B0118038 D DEB0118038 D DE B0118038D DE 435171 C DE435171 C DE 435171C
- Authority
- DE
- Germany
- Prior art keywords
- grinding
- degree
- grist
- air
- determining
- 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
Links
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N15/00—Investigating characteristics of particles; Investigating permeability, pore-volume, or surface-area of porous materials
- G01N15/02—Investigating particle size or size distribution
- G01N15/0255—Investigating particle size or size distribution with mechanical, e.g. inertial, classification, and investigation of sorted collections
Landscapes
- Chemical & Material Sciences (AREA)
- Dispersion Chemistry (AREA)
- Physics & Mathematics (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Measuring Arrangements Characterized By The Use Of Fluids (AREA)
Description
Verfahren zur Bestimmung des Vermahlungsgrades von Mahlgut. Vorliegende Erfindung bezieht sich auf ein Verfahren und eine zu seiner Durchführung geeignete Einrichtung zur Bestimmung des Vermahlungsgrades von Mahlgut ohne Verwendung von Sieben zur Aufteilung des Mahlgutes nach seinen Bestandteilen verschiedener Korngröße bzw. zur Bestimmung der technischen mittleren Korngröße. Die Erfindung macht von der Tatsache Gebrauch, daß die Durchlässigkeit von Schüttgut für einen Gasstrom von der durchschnittlichen Korngröße abhängt, da diese für die Größe der Luftzwischenräume bestimmend ist. Es ist daher möglich, aus dem zum Durchblasen einer bestimmten Luftmenge in einen bestimmten Zeitraum durch einen bestimmten Querschnitt einer Schicht von bestürmter Höhe erforderlichen Druckunterschied ein Maß für die mittlere Porenweite und damit gleichzeitig für die mittlere technische Korngröße oder- den Vermahlungsgrad zu erhalten.Method for determining the degree of grinding of grist. Present The invention relates to a method and a method suitable for carrying it out Device for determining the degree of grinding of regrind without the use of Sieving for dividing the ground material according to its components of different grain sizes or to determine the technical mean grain size. The invention makes of the fact that the permeability of bulk material to a gas flow depends on the average grain size, as this determines the size of the air gaps is decisive. It is therefore possible from the to blow a certain amount of air in a certain period of time through a certain cross-section of a layer of Stormed height required pressure difference a measure of the mean pore size and thus at the same time for the mean technical grain size or the degree of grinding to obtain.
In Abb. i ist eine Vorrichtung zur Ausführung des Verfahrens als Beispiel dargestellt. Der Apparat besteht aus drei Teilen. Der trichterförmige Unterteil a wird mit dem Mittelteil b durch die Klappschrauben s nach Zwischenfügen des Metallsiebes! verschraubt. Das letztere ist mit einer Schicht Filterpapier bedeckt, um jeglichen Durchfall des den Zylinder b füllenden Mahlgutes zu verhindern. An seinem unteren Ende trägt der Teil a eine mittels Verschraubung auswechselbare Stauscheibe d, an deren Stelle natürlich auch ein anderer Drosselkörper, etwa in: Form eines Hahnes oder eines Kapillarrohres, verwandt werden kann. Der ebenfalls trichterförmige, mit dem Mittelteil b verschraubbare Oberteil c enthält an seinem oberen Ende den Hahn h mit Schlauchtülle für den Preßluftanschluß und .im Innern den Siebboden k zur gleichmäßigen Verteilung der Preßluft. An den Stelle. f des Oberteiles bz-w. g des Unterteiles sind Ansätze mit kleinen zylindrischen Bohrungen angebracht. Man mißt dann den überdruck bei. g gegen die Atmosphäre als Maßstab für die durch den Apparat in teer Zeiteinheit durchgedrückte Luftmenge. Die öffnung der leicht auswechselbaren Stauscheibe d wählt man zweckmäßig so, daß der Druck bei g mit hinreichender Genauigkeit an einem Flüssigkeitsmanometer abgelesen werden kann. Der Druckunterschied zwischen f und g zeigt den Druckverlust in der Materialschicht an und bildet, auf eine bestimmte Luftmenge als Einheit bezogen, den gewünschten Maßstab für den Vermahlungsgrad oder die mittlere technische Korngröße des Materials. Man kann auch unter Berücksichtigung der Materialhöhe l und des Zäligkeitsmoduls .I des benutzten. Gases aus den Meßdaten nach dem Poiseuilleschen Gesetz den Radius -der mittleren kapillaren Luftwege errechnen und diesen als Maßstab für den Vermahlungsgrad benutzen.In Fig. I is an apparatus for carrying out the method as an example shown. The apparatus consists of three parts. The funnel-shaped lower part a is connected to the middle part b by the hinged screws s after inserting the metal sieve! screwed. The latter is covered with a layer of filter paper to avoid any To prevent diarrhea of the grist filling the cylinder b. At its lower At the end of the part a carries an exchangeable baffle plate d by means of a screw connection its place of course also another throttle body, for example in the form of a cock or a capillary tube, can be used. The funnel-shaped, with the middle part b screwable upper part c contains at its upper end Tap h with hose nozzle for the compressed air connection and inside the sieve base k for even distribution of the compressed air. In the place. f of the upper part or w. Approaches with small cylindrical bores are attached to the lower part. Man then measure the overpressure. g against the atmosphere as a yardstick for by the Apparatus in tar unit of time, the amount of air pressed through. The opening of the easily interchangeable Baffle plate d is expediently chosen so that the pressure at g has sufficient accuracy can be read on a liquid manometer. The pressure difference between f and g indicate the pressure loss in the material layer and forms, on a certain Air volume related as a unit, the desired scale for the degree of grinding or the mean technical grain size of the material. One can also taking into account the material height l and the tenacity module .I of the used. Gas from the measurement data Calculate the radius of the mean capillary airways according to Poiseuille's law and use this as a measure of the degree of grinding.
Will man an. Stelle der Preßluft SaugIuft verwenden, so würde der obere Trichter c des Apparates Abb. i fortfallen und an Stelle der Meßbohrung feine solche am. Auslauf unterhalb der Stauscheibe d anzubringen sein, womit sich die Bedeutung der Meßbo#brungen vertauscht. Im übrigen würde sich an der Durchführung der Messung und Auswertung nichts Grundsätzliches ändern.Do you want to. Use suction air instead of the compressed air, the The upper funnel c of the apparatus Fig. i is omitted and fine in place of the measuring bore such at the outlet below the baffle plate d to be attached, with which the Meaning of the measuring holes reversed. Otherwise it would be do not change anything fundamentally when carrying out the measurement and evaluation.
Claims (1)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DEB118038D DE435171C (en) | 1925-02-07 | 1925-02-07 | Method for determining the degree of grinding of grist |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DEB118038D DE435171C (en) | 1925-02-07 | 1925-02-07 | Method for determining the degree of grinding of grist |
Publications (1)
Publication Number | Publication Date |
---|---|
DE435171C true DE435171C (en) | 1926-10-09 |
Family
ID=6994696
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
DEB118038D Expired DE435171C (en) | 1925-02-07 | 1925-02-07 | Method for determining the degree of grinding of grist |
Country Status (1)
Country | Link |
---|---|
DE (1) | DE435171C (en) |
Cited By (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2767574A (en) * | 1953-06-22 | 1956-10-23 | Edward C Schurch | Apparatus for indicating moisture in oil |
DE1045688B (en) * | 1953-04-29 | 1958-12-04 | Union Rheinische Braunkohlen | Method and device for detecting the smallest amounts of impurities in liquids and gases, in particular sand in well water |
DE1129735B (en) * | 1956-03-06 | 1962-05-17 | Wolfgang Friedrich Dr Ing | Device for determining the degree of comminution of a fine grain material |
US4198853A (en) * | 1977-11-04 | 1980-04-22 | American Filtrona Corporation | Porosity measurement |
US4660411A (en) * | 1985-05-31 | 1987-04-28 | Reid Philip L | Apparatus for measuring transmission of volatile substances through films |
US5081863A (en) * | 1985-05-31 | 1992-01-21 | Modern Controls, Inc. | Apparatus for measuring transmission of volatile substances through films |
-
1925
- 1925-02-07 DE DEB118038D patent/DE435171C/en not_active Expired
Cited By (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE1045688B (en) * | 1953-04-29 | 1958-12-04 | Union Rheinische Braunkohlen | Method and device for detecting the smallest amounts of impurities in liquids and gases, in particular sand in well water |
US2767574A (en) * | 1953-06-22 | 1956-10-23 | Edward C Schurch | Apparatus for indicating moisture in oil |
DE1129735B (en) * | 1956-03-06 | 1962-05-17 | Wolfgang Friedrich Dr Ing | Device for determining the degree of comminution of a fine grain material |
US4198853A (en) * | 1977-11-04 | 1980-04-22 | American Filtrona Corporation | Porosity measurement |
US4660411A (en) * | 1985-05-31 | 1987-04-28 | Reid Philip L | Apparatus for measuring transmission of volatile substances through films |
US5081863A (en) * | 1985-05-31 | 1992-01-21 | Modern Controls, Inc. | Apparatus for measuring transmission of volatile substances through films |
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