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EP2155395A1 - Broyeur à impact - Google Patents

Broyeur à impact

Info

Publication number
EP2155395A1
EP2155395A1 EP08749324A EP08749324A EP2155395A1 EP 2155395 A1 EP2155395 A1 EP 2155395A1 EP 08749324 A EP08749324 A EP 08749324A EP 08749324 A EP08749324 A EP 08749324A EP 2155395 A1 EP2155395 A1 EP 2155395A1
Authority
EP
European Patent Office
Prior art keywords
elements
impact
rotor
mill according
counter
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.)
Granted
Application number
EP08749324A
Other languages
German (de)
English (en)
Other versions
EP2155395B1 (fr
Inventor
Joachim Behrmann
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.)
Amandus Kahl GmbH and Co KG
Original Assignee
Amandus Kahl GmbH and Co KG
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 Amandus Kahl GmbH and Co KG filed Critical Amandus Kahl GmbH and Co KG
Priority to EP08749324.3A priority Critical patent/EP2155395B1/fr
Publication of EP2155395A1 publication Critical patent/EP2155395A1/fr
Application granted granted Critical
Publication of EP2155395B1 publication Critical patent/EP2155395B1/fr
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

Links

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
    • B02C13/00—Disintegrating by mills having rotary beater elements ; Hammer mills
    • B02C13/14—Disintegrating by mills having rotary beater elements ; Hammer mills with vertical rotor shaft, e.g. combined with sifting devices
    • B02C13/18—Disintegrating by mills having rotary beater elements ; Hammer mills with vertical rotor shaft, e.g. combined with sifting devices with beaters rigidly connected to the rotor
    • B02C13/1807—Disintegrating by mills having rotary beater elements ; Hammer mills with vertical rotor shaft, e.g. combined with sifting devices with beaters rigidly connected to the rotor the material to be crushed being thrown against an anvil or impact plate
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
    • B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
    • B02C13/00—Disintegrating by mills having rotary beater elements ; Hammer mills
    • B02C13/26—Details
    • B02C13/282—Shape or inner surface of mill-housings
    • B02C13/284—Built-in screens
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
    • B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
    • B02C13/00—Disintegrating by mills having rotary beater elements ; Hammer mills
    • B02C13/26—Details
    • B02C13/286—Feeding or discharge

Definitions

  • the invention relates to a hammer mill with a housing, with a motor, with a rotatably driven by the motor rotor with a holder, on whose outer circumference parallel rod-shaped striking elements are mounted, arranged within the annular region feed openings for the material to be crushed and with an annular, the holder and the impact elements enclosing screen element, on the inner surface of which parallel rod-shaped counter-impact elements are arranged.
  • a previously known hammer mill (EP 0 556 645 B1) has a housing which has a horizontal plate with loading openings and a container with a conical discharge nozzle. On the vertical drive shaft within the housing is a rotor with beaters in the form of hinged hammers, which is enclosed by a box-shaped sieve. In the gap between the hammer ends and the cylindrical surface of the box-shaped screen, the crushing process, but has a number of significant disadvantages.
  • the high rotational speed of the annular layer of the comminution material in the same direction as that of the rotor rotation substantially reduces the effectiveness of the hammer blow.
  • the friction principle This process outweighs the impact principle, which eventually results in irregular milling with a high content of dust-like fractions, high energy requirements and heavy wear of work tools.
  • the disadvantage of this known impact mill is that the material is introduced relatively far in the interior of the room, which is enclosed by the annular support and the striking elements. The material is thereby gradually accelerated by the air swirls prevailing in the interior, generated by the rotating impact elements, so that the relative velocity of the particles with respect to the impact elements is lower than if the particles had no peripheral velocity component. Thus, since the impact elements do not strike the particles at full speed, the crushing effect is worse, at least for many purposes, than if the Impact elements meet more or less at rest particles.
  • the object of the invention is to provide a hammer mill of the type mentioned, with a better crushing can be achieved and requires less energy.
  • the supply openings are arranged close to the periphery of the rotor and are provided with deflection means for guiding the material to be crushed against the upper regions of the striking elements.
  • the rotor with the support and the annular sieve are, in contrast to the prior art, where they are aligned vertically aligned with its symmetry or ring plane horizontally.
  • the feed openings for the material are also arranged close to the edge of the rotor and provided with deflecting means for guiding the material to be shredded against the upper regions of the striking elements.
  • the particles are not gradually accelerated but, while practically at rest, are struck and smashed by the striking elements. In this way one obtains a particularly effective comminution.
  • the impact elements and / or the counter-impact elements have a rectangular cross-section. Particularly advantageous is square cross-section. In many cases, other cross-sectional shapes prove to be more advantageous, for example round, triangular, polygonal or trapezoidal.
  • Corresponding striking elements and counter-impact elements can be easily produced from commercially available rolled steel rods. Of course, this steel should be particularly resistant to abrasion.
  • the cross section of the impact elements is greater than the cross section of the counter-impact elements.
  • the length of the counter-impact elements is advantageously greater than that of the striking elements.
  • the striking elements and the counter-striking elements move past each other at a distance ranging from a few millimeters to about 2 cm. This distance depends on the material to be crushed, the desired grain size and the like.
  • the motor is arranged above the rotor and the sieve mounted on a vertically movable support.
  • the housing has a closable with a flap opening.
  • the sieve element can be moved into the area of this opening and can be removed from the hammer mill after the flap has been opened. This allows a particularly simple replacement of the sieve element. Then you have access to the rotor with the impact elements.
  • the rotor has a disc-shaped plate, which is provided in the central region between the central axis and the circumference with openings and over which project the impact elements up and down. Particles that have not yet been crushed enough and fall off are prevented from falling further by the disk-shaped plate. Through the openings, the particles can not penetrate it, since they are driven by the centrifugal force to the outside. Also, the screen member is provided at the bottom with a disk-shaped plate provided with a central opening.
  • the openings serve the air circulation.
  • the rotating impact elements move air from inside to outside, just like a radial fan.
  • the air then passes through the sieve and passes back through the central opening of the sieve element and the openings of the plate of the impact elements to the inside of the sieve Impact elements, from where the air is driven outwards again. It thus takes place a cycle that favors that sufficient fine-grained material is driven through the sieve to the outside.
  • the circulation of air could cause some of the fine-grained material to cycle again. However, an essential part will fall down and collected by the conically narrowing housing part, at the lower opening of the crushed material can be removed.
  • the hammer mill of the invention is universally applicable. It can not only for the production of feed, but z. B. be used for crushing wood. It is only necessary to adapt the hammer mill to the corresponding conditions by selecting suitable rotational speeds, distances between impact elements and counter-impact elements and also suitable insertion slots.
  • Figure 1 is a perspective view of the impact mill of the invention from the outside.
  • FIG. 3 in a similar representation as in Figure 2 a hammer mill with a modified lifting and locking device for the sieve.
  • Fig. 5 shows another embodiment of the arrangement of
  • Fig. 6 alternative cross-sectional shapes of the striking elements
  • Fig. 7 is a perspective view of the screen element.
  • the impact mill shown in Fig. 1 comprises a housing 1 with a lower cone-shaped part 2, in which the crushed material is collected and discharged downwards, and a Flap 3, through which, as will be described, access to the interior of the housing 1 can be obtained and the screen element can be removed.
  • the rotor, not shown in FIG. 1, with the holder and the striking elements is driven by a motor 4.
  • the material to be crushed is introduced through shafts 5, and passes through arranged at the bottom of the wells 5 openings in an upper plate 6 of the housing in the interior of the hammer mill. 1
  • the rotor 20 is shown with the holder 7 in the form of a disc-shaped plate for the striking elements 8, which protrude above and below the holder 7.
  • the holder 7 with the striking elements 8 is rotationally driven as mentioned by the motor 4.
  • the material falls through the shafts 5 against the above projecting ends of the striking elements 8 due to the deflection by deflectors 9.
  • a sieve element 10 is arranged, the counter-impact elements 11 having substantially
  • Impact elements 8 correspond, but are longer and have smaller cross-section.
  • Fig. 2 while the screen element 10 is shown in the position in which it has been driven by a support 12 down so that it can be removed through the flap 3.
  • the support 12 can be moved by linear lifting devices 13 up or down and also pivoted in the lower position about an axis 21 to the outside, so that the screen element 10 can be easily replaced.
  • FIG. 3 differs from that of FIG. 2 in that it has only a single linear lifting device 13 for the support 12 for the screening element. ment 10 has on one side of the support 12. If the screen element 10 is driven upwards, it is held there by clamping lever 22, which are rotated for this purpose.
  • the rotor shown in FIG. 4 with the plate-shaped holder 7 and the striking elements 8 not only shows that the striking elements 8 protrude upwards and downwards over the holder. Rather, openings 14 in the plate 7 are shown.
  • a lower annular element 15 increases the stability of the rotor.
  • FIG. 5 shows an embodiment in which two concentric rows of striking elements 8 are provided.
  • Various possible cross-sectional shapes of the striking elements 8 are shown in FIG. 5
  • the sieve element 10 is shown in FIG. 7. There are clearly the counter-impact elements 11 and the sieve ring surrounding surrounding sieve 18 to see. Also, the screen element 10 has a plate-shaped disc 16, which is provided with a central opening 17. Instead of a central opening 17, the disc 16 may also be provided with perforations which extend over the entire disc or only the central part thereof.
  • the mode of action of the hammer mill is the following.
  • the raw material is passed through the shafts 5 and the feed openings in the plate 6 through the baffles 9 against the upper ends of the striking elements 8.
  • the material to which the striking elements 8 meet at full speed partially crushed and then leaves under the action of centrifugal force, the rotor, the Holder 7 and the striking elements 8, and reaches the sieve element 10.
  • the material to be crushed is divided into two streams. The one stream of small particles passes out through the holes in the screen element 10 and can be removed.
  • the other stream of larger particles changes its direction when colliding with the counter-impact elements 11 and passes back into the rotor 20, in particular also the lower part thereof, where it is comminuted by the striking elements 8, which also extend into the lower part , After each stroke of the impact elements 8 against the material to be shredded this is thrown back onto the cylindrical sieve surface of the sieve element 10, where it is separated. Fine particles, which have passed through the holes in the sieve 18 under the effect of centrifugal force, are led outside the housing 1 as a finished product. Larger particles which can not pass through the holes in the sieve of the sieve element 10 are returned to the process described above.
  • a ring-like air-product layer is formed which occupies the entire height of the screen of the screen element 10.
  • the vertical currents also move upwards.
  • the degree of saturation of the air-product layer with the particles of material to be comminuted depends on the nature of the material to be comminuted and the parameters and operation of the impact mill, including the linear velocity of the impact elements 8 of the rotor 20 and the diameter of the screen 18, the screen element 10, the gap size between the striking elements 8 and the counter-striking elements 11, the diameter of the sieve holes and other circumstances.
  • the at least one opening 17 is provided in the central region of the bottom 16 of the screen element 10, through the air into the interior of the rotor 7, 8 is steered.
  • the air passes through the openings 14 in the plate 15 again in the upper region of the rotor 7, eighth

Landscapes

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

Abstract

L'invention concerne un broyeur à impact comprenant un boîtier (1), un moteur (4), un rotor avec une fixation (7), sur la périphérie extérieure de laquelle sont montés des éléments d'impact (8) en forme de barres, des ouverture d'alimentation disposées à l'intérieur de la zone annulaire pour le matériau à broyer, et un élément de tamis (10) de forme annulaire entourant la fixation (7) et les éléments d'impact (8), sur la surface interne duquel sont disposés des éléments d'impact conjugués (11) parallèles et en forme de barres. Selon l'invention, le rotor (20) et l'élément de tamis (10) de forme annulaire sont orientés horizontalement, les éléments d'impact (8) sortent vers le haut et vers le bas au-delà de la fixation (7), les ouvertures d'alimentation sont disposées à proximité de la périphérie de la fixation (7) de forme annulaire et sont munies de dispositifs de déviation (9) pour guider le matériau à broyer vers les parties supérieures des éléments d'impact (8).
EP08749324.3A 2007-05-04 2008-05-05 Broyeur à impacts Not-in-force EP2155395B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP08749324.3A EP2155395B1 (fr) 2007-05-04 2008-05-05 Broyeur à impacts

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
EP07009053A EP1987883A1 (fr) 2007-05-04 2007-05-04 Broyeur à impacts
EP08749324.3A EP2155395B1 (fr) 2007-05-04 2008-05-05 Broyeur à impacts
PCT/EP2008/003596 WO2008135267A1 (fr) 2007-05-04 2008-05-05 Broyeur à impact

Publications (2)

Publication Number Publication Date
EP2155395A1 true EP2155395A1 (fr) 2010-02-24
EP2155395B1 EP2155395B1 (fr) 2013-08-21

Family

ID=38542131

Family Applications (2)

Application Number Title Priority Date Filing Date
EP07009053A Withdrawn EP1987883A1 (fr) 2007-05-04 2007-05-04 Broyeur à impacts
EP08749324.3A Not-in-force EP2155395B1 (fr) 2007-05-04 2008-05-05 Broyeur à impacts

Family Applications Before (1)

Application Number Title Priority Date Filing Date
EP07009053A Withdrawn EP1987883A1 (fr) 2007-05-04 2007-05-04 Broyeur à impacts

Country Status (2)

Country Link
EP (2) EP1987883A1 (fr)
WO (1) WO2008135267A1 (fr)

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DK0556645T3 (da) * 1992-02-21 1996-01-29 Buehler Ag Slaglemølle
JP3947913B2 (ja) * 2002-02-19 2007-07-25 株式会社サタケ 穀物の衝撃式粉砕装置
JP4289013B2 (ja) * 2003-05-13 2009-07-01 株式会社サタケ 穀物の衝撃式粉砕装置
DE102005029899A1 (de) * 2005-06-25 2007-01-04 Gotic Gmbh Messerschneidmühle

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO2008135267A1 *

Also Published As

Publication number Publication date
EP2155395B1 (fr) 2013-08-21
WO2008135267A1 (fr) 2008-11-13
EP1987883A1 (fr) 2008-11-05

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