WO2020200759A1 - Broyeur à couteaux de laboratoire pour le broyage par découpage d'échantillons - Google Patents

Broyeur à couteaux de laboratoire pour le broyage par découpage d'échantillons Download PDF

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Publication number
WO2020200759A1
WO2020200759A1 PCT/EP2020/057252 EP2020057252W WO2020200759A1 WO 2020200759 A1 WO2020200759 A1 WO 2020200759A1 EP 2020057252 W EP2020057252 W EP 2020057252W WO 2020200759 A1 WO2020200759 A1 WO 2020200759A1
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WO
WIPO (PCT)
Prior art keywords
cutting
rotor
laboratory
cutting edge
mill
Prior art date
Application number
PCT/EP2020/057252
Other languages
German (de)
English (en)
Inventor
Leos BENES
Original Assignee
Fritsch Gmbh
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Fritsch Gmbh filed Critical Fritsch Gmbh
Priority to DE112020001635.8T priority Critical patent/DE112020001635A5/de
Publication of WO2020200759A1 publication Critical patent/WO2020200759A1/fr

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
    • B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
    • B02C18/00—Disintegrating by knives or other cutting or tearing members which chop material into fragments
    • B02C18/06—Disintegrating by knives or other cutting or tearing members which chop material into fragments with rotating knives
    • B02C18/16—Details
    • B02C18/18—Knives; Mountings thereof
    • B02C18/186—Axially elongated knives
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
    • B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
    • B02C18/00—Disintegrating by knives or other cutting or tearing members which chop material into fragments
    • B02C18/06—Disintegrating by knives or other cutting or tearing members which chop material into fragments with rotating knives
    • B02C18/14—Disintegrating by knives or other cutting or tearing members which chop material into fragments with rotating knives within horizontal containers
    • B02C18/144—Disintegrating by knives or other cutting or tearing members which chop material into fragments with rotating knives within horizontal containers with axially elongated knives
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
    • B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
    • B02C23/00—Auxiliary methods or auxiliary devices or accessories specially adapted for crushing or disintegrating not provided for in preceding groups or not specially adapted to apparatus covered by a single preceding group
    • B02C23/08—Separating or sorting of material, associated with crushing or disintegrating
    • B02C23/10—Separating or sorting of material, associated with crushing or disintegrating with separator arranged in discharge path of crushing or disintegrating zone
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
    • B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
    • B02C18/00—Disintegrating by knives or other cutting or tearing members which chop material into fragments
    • B02C18/06—Disintegrating by knives or other cutting or tearing members which chop material into fragments with rotating knives
    • B02C18/16—Details
    • B02C18/18—Knives; Mountings thereof
    • B02C2018/188—Stationary counter-knives; Mountings thereof

Definitions

  • the invention relates to a cutting mill for the cutting size reduction of samples in the
  • Laboratory cutting mills comminute the samples by means of a scissors-like cutting effect, typically between a rotating cutting rotor with one or more blades that essentially extend axially and one or more blades that are also in the
  • Such laboratory cutting mills are particularly suitable for grinding tough or fibrous samples, e.g.
  • PULVERISETTE® 25 can be found e.g. at www.fritsch.de.
  • Cutting edges that run essentially axially can also run at an angle to the axis of rotation, which in principle corresponds to a helical line.
  • a sieve for example a sieve cassette, through which the sample material that has already been sufficiently comminuted can trickle through to be collected in a collecting vessel below.
  • sample components can be squeezed or have to pass through the grinding chamber several times, especially if the cutting geometry of these samples is not correct. This can have the consequence that the sample heats up to an undesired extent or sample substances can escape in an undesirable manner. Under certain circumstances, this can result in a loss of moisture and / or substance from the sample.
  • Substance leakage from the sample material in the grinding chamber can be reduced by the invention disclosed herein.
  • a further aspect of the object of the invention is to provide a laboratory cutting mill which minimizes heating, moisture and substance losses in the samples and possibly reduces the squeezing of sample components.
  • Another aspect of the object of the invention is to provide a laboratory cutting mill which enables improved cooling of the sample, in particular when the grinding chamber is heavily filled and / or when using a suction device.
  • the invention relates to a cutting mill for the cutting size reduction of samples in the
  • the grinding chamber thus preferably has axially offset and preferably essentially axially extending counter-cutting knives, which interact with the cutting knives of the cutting rotor in such a way that the samples between the cutting knives of the cutting rotor and the counter-cutting knives are cut according to the scissors principle when the cutting edges of the cutting rotor and the stationary cutting edges slide past each other.
  • the cutting edges of the cutting rotor are preferably straight cutting edges and / or preferably run parallel to the axis of rotation. In some cutting rotor geometries, however, the cutting edges of the cutting rotor can also run obliquely or along a helical line or have a twist. For example, cutting rotors with so-called V-cutting edges can be used, in which the cutting edges are axially offset to the axis of rotation and essentially run axially but obliquely along a helical line so that the cutting edges have a twist.
  • the laboratory cutting mill initially comprises a device housing, a cutting rotor with at least one cutting knife with a preferably sharp cutting edge, the cutting edge being able to run parallel or at an angle to the axis of rotation of the cutting rotor.
  • the laboratory cutting mill further comprises a drive motor for rotating the cutting rotor and a grinding chamber in which the one driven by the drive motor
  • the cutting rotor rotates in order to cut the samples in the grinding chamber into small pieces.
  • the cutting rotor which is driven to rotate by the drive shaft, therefore rotates around an axis of rotation within the grinding chamber.
  • At least one stationary counter-cutting knife or several, e.g. two, in particular opposing counter-cutting knives arranged.
  • the stationary counter-cutting knife or knives each have a cutting edge such that the cutting edges of the rotating cutting knife (s) and the stationary
  • Counter-cutting knife (s) form pairs of cutting edges or a pair of cutting edges and are guided past one another running parallel or obliquely to one another by the rotation of the cutting rotor in order to place the sample between the cutting edges of the rotating cutting knife (s) and the stationary counter-cutting knife (s) to be chopped by cutting.
  • At least one of the cutting edges of the rotating cutting knife (s) of the cutting rotor and / or of the stationary counter cutting knife (s) now has at least one notch in the cutting edge such that air can flow through the notch when the two Cut directly opposite each other.
  • the cutting rotor according to the invention accordingly has notches, e.g. Millings on, so that further edges and possibly corners arise, which as further breaking and / or
  • Cutting surface can act. Furthermore, the notches or millings create cavities which are dependent on the number and size of the notches. The size and number of notches can be varied depending on the task at hand.
  • the at least one or the notches are preferably provided in the cutting blade or blades of the cutting rotor. However, it should initially not be ruled out either alternatively or additionally to provide such notches in the cutting edge or cutting edges of the stationary counter-cutting knife or knives.
  • this cutting rotor can reduce heat build-up and thus moisture and substance losses on the sample by up to 20% compared to conventional cutting rotors.
  • the present cutting mill is a cutting mill on a laboratory scale, ie a so-called laboratory cutting mill.
  • a laboratory cutting mill elastic or fibrous samples, especially biological samples, are to be comminuted.
  • the special problems described in the introduction have arisen especially with these samples.
  • the present invention can solve these particular problems.
  • the squeezing of Sample components are reduced and the probability that samples have to pass through the grinding chamber several times can possibly be reduced.
  • excessive, undesired heating of the sample can be avoided or at least reduced.
  • moisture and / or substance losses from the sample can possibly be reduced. Gripping and pulling in the samples is typically not an option with such laboratory cutting mills
  • the diameter of the cutting rotor in a laboratory cutting mill is preferably in the range between 50 mm and 200 mm, preferably in the range between 80 mm and 150 mm.
  • the length of the cutting rotor is preferably in the range between 40 mm and 200 mm, preferably between 60 mm and 150 mm.
  • the laboratory cutting mill preferably has a sieve, in particular as part of a sieve cassette, which is preferably located under the grinding chamber.
  • the sieve cassette can comprise a round shaped sieve corresponding to the circumference of the cutting rotor, so that the
  • the cutting rotor slides along the part-circular sieve and those sample particles pass through the sieve openings into a collecting vessel, which can be arranged under the grinding chamber.
  • At least one of the cutting edges of the rotating cutting knife of the cutting rotor and / or of the stationary counter-cutting knife has a plurality of notches made in the cutting edge along the cutting edge.
  • the multiple notches create, so to speak, teeth between the notches on the corresponding cutting edge, so that one can speak of a toothed cutting edge. This creates additional cutting edges on each notch or on each of the teeth, which some
  • Sample materials can contribute to an improvement in the crushing effect.
  • the at least one or more, preferably more pointed, cutting edges of the cutting rotor are toothed, whereas the preferably blunt cutting edges of the counter-cutting knife or knives are smooth, that is, toothless.
  • At least one of the cutting edges of the rotating cutting knife of the cutting rotor and / or of the stationary counter-cutting knife preferably has a number of 2 to 15, preferably 3 to 10, more preferably 5 or 6 +/- 2 or 5 or 6 +/- 1 notches made in the cutting edge along the cutting edge. This has proven to be particularly advantageous in the case of elastic and fibrous samples.
  • the cutting edge or cutting edges of the rotating cutting knife (s) of the cutting rotor are designed as acute-angled cutting edges with a
  • Cutting rotor has a more acute cutting edge angle than the cutting edge (s) of the
  • the cutting edge (s) of the cutting rotor are accordingly preferably sharp cutting edges, while the stationary cutting edge (s) are rather blunt. It is preferred that the rotating cutting edge (s) of the cutting rotor are provided with notches or are toothed, but the stationary cutting edge (s) are preferably smooth or untoothed cutting edge (s).
  • the at least one or the several notches are accordingly made in the acute-angled cutting edge of the rotating cutting blade of the cutting rotor.
  • the axial width of the notch or notches is between 2 mm and 10 mm, preferably between 3 mm and 8 mm, preferably between 4 mm and 6 mm, more preferably in the range of 5 mm +/- 1 mm.
  • the tangential depth of the notch or notches is between 2 mm and 10 mm, preferably between 3 mm and 8 mm, preferably between 4 mm and 6 mm, more preferably in the range of 5 mm +/- 1 mm.
  • the axial distance between the notches is between 5 mm and 40 mm, preferably between 10 mm and 30 mm, preferably between 12 mm and 25 mm, more preferably in the range of 17.5 mm +/- 5 mm or 17, 5 mm +/- 3 mm.
  • the notches or teeth are distributed equidistantly over the cutting edge (s).
  • the notch or the notches have the shape of a halved elongated hole. E.g. run the notch or the notches proximal to the cutting edge in a straight line tangential and end distal to the cutting edge semicircular or semicircular.
  • the cutting rotor preferably has several cutting blades, preferably a number of 2 to 8, preferably 3 to 6, more preferably 4 cutting blades, and several or all of the cutting blades of the cutting rotor each have at least one or more notches made in the respective cutting edge.
  • the rotating cutting knife (s) are releasably attached to the cutting rotor, e.g. screwed tight.
  • the rotating cutting knife (s) accordingly each have a first cutting edge and a second cutting edge opposite the first cutting edge, in such a way that the cutting knife (s) can be detached from the cutting rotor, turned over and fastened again in order to then cut with the second cutting edge can.
  • the service life of the cutting rotor can be extended and the wear costs can be reduced.
  • the second cutting edge is designed as a smooth cutting edge, i.e. has no such notches or teeth, so that can be cut with the respective first cutting edge with notches or alternatively with the respective second smooth cutting edge without notches, depending on which of the two cutting edges is arranged forward in the direction of rotation.
  • the device housing comprises an axially end-face closure cover which can be opened to open the grinding chamber and in which the cutting rotor is rotatably mounted on the axial side opposite the drive motor when the closure cover is closed.
  • the cutting rotor can preferably be pushed coaxially by hand onto the drive shaft and removed when the grinding chamber is open, so that the cutting rotor can easily be replaced.
  • the drive shaft has driver elements which positively engage in the cutting rotor when the cutting rotor is placed on the drive shaft in order to transmit the torque to the cutting rotor by means of the driver elements.
  • the grinding chamber has a cylindrical shape and surrounds the cutting rotor along the entire circumference in order to reduce dead spaces. So has the remaining space between the cutting rotor and the inner circumference of the cylindrical grinding chamber has the shape of a cylinder jacket.
  • the radial width of the cylinder jacket-shaped intermediate space in the area between the cutting rotor and the inner wall of the grinding chamber is preferably less than 30 mm, preferably less than 20 mm.
  • the inner circumference of the grinding chamber is formed by a round-shaped sieve, for example a sieve cassette.
  • the grinding chamber is thus delimited radially all around by the inside of a housing wall and in the lower area by the round-shaped sieve.
  • a radial insertion opening runs in the radial housing wall, preferably vertically or obliquely from above, for introducing the ground material into the space between the cutting rotor and the inside of the housing wall.
  • the radial insertion opening preferably has one
  • the radial insertion opening preferably runs in a straight line directly towards the cutting rotor, so that the material to be ground can be guided directly onto the cutting edge (s) and, if necessary, can be stuffed.
  • the geometry of the grinding chamber can contribute to clogging-free work.
  • the ground material can advantageously be actively transported further during the comminution and the risk of the ground material becoming stuck can be reduced.
  • the cutting rotor is preferably axially supported on both sides, e.g. by means of conical bearings. Axially on the front side, the cutting rotor runs preferably with a short distance (preferably less than 10 mm) between two end walls of the grinding chamber, so that there is hardly any dead space here either. One of the two end walls forms the rear wall of the grinding chamber. Behind the
  • the drive motor is preferably arranged and drives the grinding chamber rear wall
  • the drive motor which is preferably arranged coaxially, is preferably a maintenance-free three-phase motor with a power in the range from 2 kW to 8 kW, preferably 3 to 6 kW, in particular with a frequency converter.
  • an air flow generating device for example an air suction device, is contained which generates an air flow through the grinding chamber in order to promote the removal of the comminuted sample particles by means of the air flow.
  • the air flow can be improved in a special way by creating an improved air flow through the notches, especially when the grinding chamber is heavily loaded and when the rotating and stationary cutting knives are directly opposite each other, which has a positive effect on the cooling of the sample and thus the Can affect the shredding result.
  • the air flow generation device or air suction device preferably has a cyclone separator in which the comminuted sample particles are separated from the air flow into a collecting vessel.
  • the present invention also relates to the cutting rotor with the features disclosed above, prepared for a laboratory cutting mill.
  • FIG. 1 shows a three-dimensional representation of a laboratory cutting mill according to a
  • FIG. 2 shows the laboratory cutting mill from FIG. 1 with the upper part of the housing and the grinding chamber cover open
  • Fig. 3 is a cross-sectional view along the line 3-3 in Fig. 1, 4 shows a three-dimensional representation of the laboratory cutting mill as in FIG. 2, but with the cutting rotor removed,
  • FIG. 5 shows an exploded view of the laboratory cutting mill from FIG. 1,
  • FIG. 7 shows a three-dimensional representation of the cutting rotor with a released cutting knife
  • FIG. 8 shows a three-dimensional representation of the cutting knife
  • FIG. 9 is a plan view of the cutting knife from FIG. 8,
  • FIG. 10 shows a cross-sectional view of the cutting knife along the section line 10-10 in FIG. 9.
  • FIG. 11 shows a three-dimensional view of a laboratory cutting mill with suction device according to an embodiment of the invention
  • the laboratory cutting mill 10 has a device housing 12, from which the parts of the laboratory cutting mill are accommodated.
  • the laboratory-scale device housing 12 of the cutting mill may e.g. be placed on a tripod 8 (Fig. 1) or on a table (not shown).
  • a commercially available electric drive motor 14 in the form of a three-phase motor with an output of 5 kW and a frequency converter (FIG. 5).
  • the drive motor 14 is a geared motor for a laboratory cutting mill 10 with a speed range of 50 to 700 rpm.
  • Another embodiment of the laboratory cutting mill 10 works with a drive motor 14 without a gear (not shown) for a
  • the grinding chamber 16 (FIGS. 2-5), into which the samples to be comminuted or the material to be ground are filled via an optional filling funnel 18 and through a particularly radial filling opening 19 (FIGS. 3, 5) can be.
  • the lateral or axial grinding chamber closure cover 20 can be opened, which means that the grinding chamber 16 is accessible laterally or axially for removing the cutting rotor 30 when the grinding chamber closure cover 20 is open.
  • Grinding chamber upper part 21 also improves the accessibility of the open grinding chamber 16.
  • the cutting rotor 30 can be manually withdrawn horizontally or axially from the drive shaft 26.
  • the cutting rotor 30 is only plugged axially onto the drive shaft 26 and is not axially fastened except through the axial fixing by means of a conical bearing 54 when the grinding chamber closure cover 20 is closed.
  • the cutting rotor 30 can accordingly be pulled off the drive shaft 26 without a tool after the axial grinding chamber closure cover 20 has been opened.
  • the cutting rotor 30 has a plurality of blades 34 running parallel to the axis of rotation A and rotating about the axis of rotation A.
  • Stationary counter-cutting knives 62 running parallel to the axis of rotation A are provided on the circumference of the grinding chamber 16
  • Filling funnel 18 and the filling opening 19 are filled into the grinding chamber 16 and can be stuffed with a plunger 68 if necessary.
  • Sample material between the rotating blades 34 and the stationary blades 64 is comminuted by cutting using the scissors principle.
  • the closed grinding chamber 16 has a largely cylindrical shape and is delimited circumferentially in the upper region by an inner side 102 of a radial housing wall 104 and on its underside by a sieve cassette 80.
  • the sieve cassette 80 has a curved approximately semicircular upper sieve 82 which is attached to the circumference of the
  • Cutting rotor 30 is adapted so that the cutting rotor 30 slides along the inside of the sieve 82 and the comminuted sample material is conveyed by the rotation of the
  • a cylindrical jacket-shaped gap 106 is formed, which is relatively narrow radially in order to minimize the dead space.
  • the radial width of the gap 106 is only a few millimeters in this example.
  • the grinding chamber 16 is also delimited in the upper area by the inner side 102 of the radial housing wall 104 or the upper housing part 21, so that the grinding chamber 16 is closed radially all round, except for the relatively small one
  • Cutting rotor 30 and the radial housing wall 104 are therefore well grasped and taken along by the cutting rotor 30. This can be further supported by the in the
  • the ground material can thus be stuffed directly onto the notched cutting edge 34 with the plunger 68.
  • the grinding chamber 16 is delimited axially by a first and second grinding chamber end wall 23, 24, the second grinding chamber end wall 24 forming the grinding chamber rear wall behind which the drive motor 14 is arranged to drive the cutting rotor 30 coaxially via the drive shaft 26.
  • the first grinding chamber end wall 23 is formed by the axial closure cover 20 which can be opened in this example.
  • Grinding chamber housing 17 is closed on all sides, in particular also on the radial circumference, except for the filling opening 19 which runs in a straight line on the cutting rotor 30 and through which the ground material, e.g. fibrous biological samples, which may also be elongated, e.g. Plant stalks can be stuffed straight directly onto the notched cutting edges 34 of the cutting rotor 30.
  • the grinding chamber housing 17, which forms the left housing part 12b, is axially attached to the motor housing, which forms the right housing part 12a,
  • the cutting rotor 30 has several therein
  • Exemplary embodiment has four cutting knives 32 which rotate about the axis of rotation A when the cutting rotor 30 rotates in the grinding chamber 16.
  • each of the four rotating cutting knives 32 has opposing first and second cutting edges 34, 36.
  • the first cutting edge 34 has a plurality of notches 38, in this example five notches 38.
  • the notches 38 in the first cutting edge 34 are distributed regularly or equidistantly along the first cutting edge 34.
  • the notches 38 form teeth 40 on the first cutting edge 34, namely between the notches 38, among other things.
  • the first cutting edge 34 is designed as a toothed cutting edge 34.
  • the second cutting edge 36 is designed as a conventional smooth cutting edge 36, that is to say has no notches.
  • the cutting rotor 30 has exchangeable cutting blades 32.
  • the cutting rotor 30 has a cutting rotor core 42 which can be plugged onto the drive shaft 26.
  • the four cutting knives 32 are releasably attached to the circumference of the cutting rotor core 42, for example by means of screws 44.
  • this has synergistic advantages.
  • each cutting knife 32 can be detached and replaced individually, e.g. if one or more of the cutting blades 32 should be worn or damaged. In connection with the present invention, however, there is still another advantage of this particular embodiment.
  • the cutting knives 32 can be turned so that the user can either fasten the toothed first cutting edge 34 or the smooth second cutting edge 36 in the direction of rotation ahead of the cutting rotor core 42, so that the cutting blade is cut with the desired cutting edge when the cutting rotor rotates.
  • the rotating cutting knives 32 on the toothed first cutting edge 34 have five notches 38 evenly distributed along the first cutting edge 34.
  • the notches 38 are milled proximally of the cutting edge 34 in a straight line with parallel edges 39 in the cutting edge 34, the straight part 46 of the notches 38 in this example having a depth of 2.5 mm and a width of 5 mm.
  • the terminate distal to the cutting edge 34 Notches or millings 38 in a semicircular end 48 with a diameter of 5 mm, so that the notches or millings 38 in this example have a half-long hole-like or half-oval shape.
  • the tangential depth of the notches or millings 38 is accordingly 5 mm.
  • the center-to-center spacing of the notches 38 is 17.5 mm in this example.
  • the axial width of the teeth 40 between the notches is 12.5 mm.
  • the total width 50 of the cutting knife is 89 mm.
  • the first and second cutting edges 34, 36 of the rotating cutting knives 32 have an acute cutting edge angle 52 of 40 °.
  • the counter-cutting knives 62 on the other hand, have a rather obtuse cutting angle 66 of slightly less than 90 ° (FIG. 5).
  • the notches 38 extend preferably perpendicular to the underside 32a of the rotating cutting knife 32 through the cutting edge 34 or transversely to the bevel 35 of the acute-angled cutting edge 34. More preferably, the notches 38 only extend in the front part 34a of the acute-angled cutting edge 34 and not over the entire bevel 35 of the cutting edge 34. In other words, the notches 38 preferably do not extend completely to the upper side 32b of the cutting knife 32.
  • Geometries can have advantages with regard to the stability of the fine cutting blades 32 in a laboratory cutting mill.
  • the cutting rotor 30 or the cutting knives 32 and / or the counter-cutting knives 62 can be made, for example, from hardened stainless steel or hard metal tungsten carbide. Even if this is not shown in the exemplary embodiment, it also appears fundamentally possible to provide the cutting edges 64 of the counter-cutting knife 62 with notches 38.
  • the embodiment described above shows a cutting rotor 30 with detachable or removable cutting knives 32 which run parallel to the stationary counter-cutting knives 62.
  • a cutting rotor 30 is well suited for cutting material such as hay,
  • the invention can also be used with other cutting rotor shapes, for example with a cutting rotor with inclined cutting edges, ie cutting edges that have a twist.
  • An example of inclined cutting edges is a cutting rotor with so-called V-cutting edges. It is therefore also possible to provide cutting rotors, for example with V-cutting edges, with notches 38 or teeth 40. Cutting rotors with V-cutting edges, with their particularly acute cutting edge angle and the resulting high cutting effect, are particularly suitable for shredding tough-elastic materials and foils.
  • the laboratory cutting mill 10 can include a
  • Air flow generating means e.g. be equipped in the form of a suction device 70.
  • the suction device 70 comprises a suction device 72 and a cyclone separator 74, sometimes also referred to as a centrifugal separator or simply cyclone, which separates the comminuted grist from the air flow.
  • a collecting vessel 76 is attached, in which the finely comminuted constituents, which are carried away by the air flow, can settle and are collected.
  • the speed of the cutting rotor 30 can be between 50 and 5000 min- 1 .
  • the rotational speed of the laboratory granulator 10 is optionally adjustable, for example depending on the application from about 300 to 3000 min- 1 or about 50 to 700 min. 1 This can result in a cutting rotor circumferential speed in the range of 0.2-20 m / s.
  • the feed size of the sample material can be between 50 and 150 mm, depending on the version of the laboratory cutting mill. With such a laboratory cutting mill, for example, a maximum
  • Throughput can be achieved in the range of 30-100 l / h.
  • the laboratory cutting mill 10 comminutes the ground material or the sample by cutting action between the axially extending blades 34 of the cutting rotor 30 in the present example and the stationary ones, which are also axially extending
  • the laboratory cutting mill 10 thus works on the scissors principle which the sample is cut between a pair of blades.
  • Counter-cutting knife 62 offset parallel to the axis of rotation A.
  • the cutting edges 34, 36, 64 of the cutting rotor 30 and / or the stationary counter-cutting knife 62 can, however, also run axially obliquely (with a twist), e.g. in the case of a cutting rotor 30 with so-called V-shaped cutting edges. In the sense of a laboratory cutting mill 10, such cutting edges 34, 36, 64 also run obliquely (with a twist) but in any case not transversely or perpendicular to the axis of rotation A. acute-angled helix.
  • the cutting rotor 30 has notches or
  • Millings 38 in the cutting edges, which produce additional cutting edges on each of the teeth 40 thus formed. These additional cutting edges or corners form further breaking and cutting surfaces.
  • the notches or millings 38 also result in cavities, which are dependent on the number and size of the notches or notches.
  • Millings 38 are and to the respective task, e.g. the respective sample material can be adapted.
  • Cyclone separator 74 can be further improved synergistically. Depending on the nature of the sample and the amount of sample, the use of such a cutting rotor can reduce the heating and loss of moisture and substance in the sample by up to 20% compared to conventional ones

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  • Engineering & Computer Science (AREA)
  • Food Science & Technology (AREA)
  • Crushing And Pulverization Processes (AREA)

Abstract

L'invention concerne un broyeur à couteaux de laboratoire (10) destiné au broyage par découpage d'échantillons, comprenant : un boîtier d'appareil (12), un rotor de coupe (30) doté d'au moins une lame de coupe (32) ayant au moins un tranchant (34), un moteur d'entraînement (14) destiné à l'entraînement en rotation du rotor de coupe (30), une chambre de broyage (16) dans laquelle tourne le rotor de coupe (30) entraîné par le moteur d'entraînement (14) afin de broyer les échantillons dans la chambre de broyage (16), au moins une contre-lame fixe (62) ayant un tranchant (64), de sorte que les tranchants (34, 64) de la lame de coupe (32) en rotation et de la contre-lame fixe (62) sont déplacés l'un contre l'autre sous l'effet de la rotation du rotor de coupe (30) en vue de broyer par découpage l'échantillon entre les tranchants (34, 64) de la lame de coupe (32) rotative et de la contre-lame fixe (62). Au moins l'un des tranchants (34, 64) de la lame de coupe (32) rotative du rotor de coupe et/ou de la contre-lame fixe (62) possède au moins une encoche (38) dans le tranchant (34, 64).
PCT/EP2020/057252 2019-03-29 2020-03-17 Broyeur à couteaux de laboratoire pour le broyage par découpage d'échantillons WO2020200759A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DE112020001635.8T DE112020001635A5 (de) 2019-03-29 2020-03-17 Labor-schneidmühle zum schneidenden zerkleinern von proben

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102019108306.0A DE102019108306A1 (de) 2019-03-29 2019-03-29 Schneidmühle zum schneidenden Zerkleinern von Proben
DE102019108306.0 2019-03-29

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WO2020200759A1 true WO2020200759A1 (fr) 2020-10-08

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WO (1) WO2020200759A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102022115335A1 (de) 2022-06-20 2023-12-21 Fritsch Gmbh Labormühle
DE102022115334A1 (de) 2022-06-20 2023-12-21 Fritsch Gmbh Labormühle

Citations (2)

* Cited by examiner, † Cited by third party
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GB1482912A (en) * 1973-07-10 1977-08-17 Leesona Plastics Mach Ltd Rotary machinery
DE102018113751A1 (de) 2018-06-08 2019-12-12 Fritsch Gmbh Schneidmühle zum schneidenden Zerkleinern von Proben

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Publication number Priority date Publication date Assignee Title
DE102022115335A1 (de) 2022-06-20 2023-12-21 Fritsch Gmbh Labormühle
DE102022115334A1 (de) 2022-06-20 2023-12-21 Fritsch Gmbh Labormühle
WO2023247261A1 (fr) 2022-06-20 2023-12-28 Fritsch Gmbh Broyeur de laboratoire
WO2023247260A1 (fr) 2022-06-20 2023-12-28 Fritsch Gmbh Broyeur de laboratoire

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