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WO1996014157A1 - Concasseur pour produits collants - Google Patents

Concasseur pour produits collants Download PDF

Info

Publication number
WO1996014157A1
WO1996014157A1 PCT/EP1995/004216 EP9504216W WO9614157A1 WO 1996014157 A1 WO1996014157 A1 WO 1996014157A1 EP 9504216 W EP9504216 W EP 9504216W WO 9614157 A1 WO9614157 A1 WO 9614157A1
Authority
WO
WIPO (PCT)
Prior art keywords
housing
wall
impact mill
teeth
mill according
Prior art date
Application number
PCT/EP1995/004216
Other languages
German (de)
English (en)
Inventor
Jan Van Den Meersche
Original Assignee
Henkel Kommanditgesellschaft Auf Aktien
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 Henkel Kommanditgesellschaft Auf Aktien filed Critical Henkel Kommanditgesellschaft Auf Aktien
Publication of WO1996014157A1 publication Critical patent/WO1996014157A1/fr

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
    • B02C13/20—Disintegrating by mills having rotary beater elements ; Hammer mills with two or more co-operating rotors
    • 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
    • B02C13/02—Disintegrating by mills having rotary beater elements ; Hammer mills with horizontal rotor shaft
    • B02C13/06—Disintegrating by mills having rotary beater elements ; Hammer mills with horizontal rotor shaft with beaters rigidly connected to the rotor
    • 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
    • B02C13/28—Shape or construction of beater elements
    • B02C13/2804—Shape or construction of beater elements the beater elements being rigidly connected to the rotor
    • 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 beater mill for sticky products with a mainly cylindrical mill housing, an inlet and an outlet opening, with beaters which can be rotated about the housing axis and directed towards the inner wall of the housing and with at least one wiper which can be rotated in the same direction or in the opposite direction about the housing axis.
  • the peripheral end of which extends in the axial direction at least over the axial area occupied by the rackets and is at a smaller distance from the inner wall of the housing than the rackets.
  • the mills of the type mentioned tend to become blocked when processing sticky material, for example moist material or material that tends to cake for some other reason.
  • Various measures are known from the prior art with which this problem can be solved.
  • the sticky material is to be conveyed pneumatically after comminution.
  • the particles must be small enough to be carried along by the air flow and not to clog the transport lines.
  • a further impact mill which is suitable for comminuting material which tends to stick, is described in German Auslegeschrift 1,296,941. Baking of the sticky products is also prevented here, as in the impact mill already mentioned, by lining the inner surfaces of the housing with an elastic material with a smooth surface. The lining of all inner walls of the mill, which can be reached by the sticky particles, leads to a relatively high outlay.
  • Another impact mill does not have a lining of the inner walls.
  • This mill which is known from EP 0 353 576 A2, is equipped with removal beaters or scrapers in order to avoid blockages due to caking of the product.
  • the beater wheel is equipped with two diametrically opposed, enlarged wipers which keep a grinding chamber on the periphery of the beater wheel free and thus prevent the beater wheel from blocking due to caking product.
  • the peripheral edge of the clearing racket is provided with a toothing which is arranged in such a way that the tooth of one clearing racket falls into the gap of the other.
  • the end of the scraper facing the inner wall of the housing has saw-like teeth with a triangular tooth shape and the pointed peripheral ends of the teeth are at a distance of at most 1 mm from the inner wall of the housing.
  • coarser particles are no longer scraped off the inner wall of the housing by the scraper, even if coarse particles bake there.
  • coarse particles are crushed by the pointed, saw-like teeth during scraping.
  • thicker layers cannot form on the inner wall of the housing, since the teeth have a maximum distance of at most 1 mm from the housing.
  • the sawtooth shape of the scraper leads to another advantage. Previously, the mill had to be cleaned after it had been stopped in order to be able to start it up again without any problems, since the layer applied to the inner surface of the mill housing would have required the motor to start up too quickly. In the sawtooth-like shape of the scraper according to the invention, cleaning before restarting is no longer necessary, since only a relatively low starting torque is required even with a layer attached to the inner surface of the housing.
  • the detached product batch cannot be pressed between the inner wall of the mill and the scraper.
  • Such pressing is completely ruled out if, in an advantageous embodiment of the invention, the end face of the teeth of the scraper facing the inner wall of the housing forms a wedge gap tapering in the circumferential direction of the scraper with this inner wall.
  • the surfaces of the teeth of the wiper pointing in the direction of movement have the shape of equilateral triangles.
  • a plurality of wipers with teeth offset from one another are provided. Two wipers are preferably provided, the teeth of one wiper falling into the gaps between the teeth of the other wiper.
  • the teeth of the leading scraper tear open the product batch in a strip.
  • the main part of the remaining product approach strips is removed from the teeth of the subsequent stripper.
  • the sawtooth-like shape of the stripper ensures that the product batch is reduced to small enough particles during the scraping process, which are carried by the air flow in a pneumatic conveying system downstream of the mill and thus do not cause blockages in the transport system.
  • the downtimes of the production plant due to coarse particles which the mill releases into the pneumatic conveying line can be further reduced in an advantageous embodiment of the invention.
  • the impact mills frequently have zones, so-called dead zones, which deviate from the cylindrical shape, in the area of the outlet opening of the mill. So that no product layer builds up in this part and the line can no longer be blocked by particles flaking off this layer, it is proposed to attach fittings to the dead zones which enlarge the cylindrical area of the inner wall.
  • the dead zones can advantageously be lined with an elastic material which likewise prevents the product from caking.
  • the invention further consists in the use of the abovementioned beater mill for comminuting sticky ones and those which tend to form agglomerates Granules, especially granules that are active in washing and cleaning. Due to their surfactant content, these granules are particularly prone to agglomerate formation and caking.
  • the impact mill can be used advantageously for crushing these compacted granules.
  • Such granules and their preparation are described in more detail, for example, in WO 91/02047.
  • the granules are extruded from homogeneous premixes with the addition of a plasticizer and / or lubricant through perforated shapes with opening widths of the predetermined granule dimension at high pressures between 25 and 200 bar. After exiting the hole shape, the strand is cut to the predetermined granule size by means of a cutting device, sieved and powdered. After rounding off the edges in a rounding device, the granules are dried and cooled.
  • the impact mill according to the invention is particularly suitable for use in this process.
  • the coarse fractions to be comminuted with the impact mill are obtained on the one hand after the premix has been sieved and, on the other hand, after the cut granules have been sieved before they are powdered.
  • the above-mentioned problems occur here to an increased degree, because the premix and the warm, not yet powdered granules, because of their surfactant content, have a very strong tendency to stick to one another and thus to form coarse agglomerates and to bake inside the beater and their outlet opening.
  • FIG. 1 shows a side view of a hammer mill according to the invention in the direction of the mill axis, partly in section,
  • FIG. 2 shows a view of the impact mill in the direction of arrow II in FIG. 1,
  • FIG. 3 shows a section transverse to the longitudinal axis of the impact mill according to FIG. 1,
  • Figure 4 shows a detail of Figure 3
  • FIG. 5 shows the view A of the peripheral end of the scraper in FIG. 4.
  • a mainly cylindrical housing 1 which is surrounded by a cover 2, rotated on a beater wheel 18 and radially extending from there bats 19 and a scraper ring 3.
  • a beater wheel 18 On the outside of the scraper ring 3 are two opposite, over the entire length the stripper 4, 5 extending striker attached.
  • the scraper ring 3 rotates in the direction of arrow 6 in the opposite direction to the beater wheel 18, which rotates in the direction of arrow 7.
  • the cylindrical inner wall in the upper part of the housing 1 continues downwards as a flat vertical wall.
  • fittings 8, 9 are attached to the vertically extending walls 10, 11.
  • the shredded product falls down through the outlet opening 12 into the pneumatic conveying area. Conveying air flows in from the left, which is indicated by the arrow 20, and the product is pneumatically transported in the direction of the arrow 21. Caking in the area of the outlet opening 12 is avoided by the lower ends of the shaped pieces 8, 9 passing into rubber aprons 13, 14, the other ends of which are fastened to the lower edge of the outlet opening 12.
  • FIG. 2 shows, among other things, the product inlet 22 through which the still unreduced product is fed to the beater wheel 18. To the comminution, the product falls down and exits the product outlet 23 in order to be transported pneumatically.
  • the structure and the mode of operation of the mill can be seen particularly clearly from this drawing and is therefore not explained again.
  • the same reference symbols have the same meaning.
  • FIG. 4 shows the scraper 4 in an enlarged form.
  • the scraper consists of a solid profile 15 which carries a sharply ground toothed knife 16.
  • the sawtooth tips of the knife 16 are only 1 mm from the inside of the housing wall 1.
  • FIG. 5 shows view A in the direction of arrow 17 of FIG.

Landscapes

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

Abstract

L'invention concerne un concasseur présentant un bâti (1) pratiquement cylindrique, une ouverture d'entrée et de sortie (12), des batteurs (19) pouvant tourner autour de l'axe du bâti, dirigés vers la paroi intérieure du bâti (1) et au moins une racle (4, 5) pouvant tourner dans le même sens ou en sens inverse autour de l'axe du bâti. L'extrémité périphérique de la racle s'étend, dans le sens axial, au moins au-dessus de la zone axiale définie par les batteurs (19) et se situe à une distance inférieure de la paroi intérieure du bâti (1) que les batteurs (19). L'extrémité, dirigée vers la paroi intérieure du bâti (1), de la racle (4, 5) présente des dents de scie de forme triangulaire, et les extrémités périphériques pointues des dents sont situées à une distance de 1 mm au maximum de la paroi intérieure du bâti (1). Les particules de grande taille ne peuvent pas passer à travers l'ouverture de sortie (12), ce qui empêche l'engorgement d'un système de transport pneumatique raccordé.
PCT/EP1995/004216 1994-11-04 1995-10-26 Concasseur pour produits collants WO1996014157A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DEP4439449.7 1994-11-04
DE19944439449 DE4439449A1 (de) 1994-11-04 1994-11-04 Schlagmühle für klebrige Produkte

Publications (1)

Publication Number Publication Date
WO1996014157A1 true WO1996014157A1 (fr) 1996-05-17

Family

ID=6532497

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP1995/004216 WO1996014157A1 (fr) 1994-11-04 1995-10-26 Concasseur pour produits collants

Country Status (2)

Country Link
DE (1) DE4439449A1 (fr)
WO (1) WO1996014157A1 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US10632471B2 (en) * 2015-10-13 2020-04-28 Pallmann Maschinenfabrik Gmbh & Co. Kg Device for comminuting feed material

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR731594A (fr) * 1931-03-06 1932-09-05 Schuchtermann & Kremer Baum Ag Broyeur centrifuge
DE1296941B (de) * 1966-03-11 1969-06-04 Hazemag Hartzerkleinerung Schlaegermuehle zum Zerkleinern von zum Anbacken neigendem Gut
FR2240767A1 (en) * 1973-08-14 1975-03-14 Aebi & Co Ag Ventilator for dispersing comminuted granular material e.g. corn cobs - has two impellers counter rotating at different speeds
EP0353576A2 (fr) * 1988-07-30 1990-02-07 Henkel Kommanditgesellschaft auf Aktien Broyeur à impact
WO1991002047A1 (fr) * 1989-08-09 1991-02-21 Henkel Kommanditgesellschaft Auf Aktien Fabrication de granules comprimes pour produits de lavage

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR731594A (fr) * 1931-03-06 1932-09-05 Schuchtermann & Kremer Baum Ag Broyeur centrifuge
DE1296941B (de) * 1966-03-11 1969-06-04 Hazemag Hartzerkleinerung Schlaegermuehle zum Zerkleinern von zum Anbacken neigendem Gut
FR2240767A1 (en) * 1973-08-14 1975-03-14 Aebi & Co Ag Ventilator for dispersing comminuted granular material e.g. corn cobs - has two impellers counter rotating at different speeds
EP0353576A2 (fr) * 1988-07-30 1990-02-07 Henkel Kommanditgesellschaft auf Aktien Broyeur à impact
WO1991002047A1 (fr) * 1989-08-09 1991-02-21 Henkel Kommanditgesellschaft Auf Aktien Fabrication de granules comprimes pour produits de lavage

Also Published As

Publication number Publication date
DE4439449A1 (de) 1996-05-09

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