EP0348262B1 - Verfahren zur Feinzerkleinerung von Mahlgut und verbesserte Walzenmühle zur Durchführung dieses Verfahrens - Google Patents

Verfahren zur Feinzerkleinerung von Mahlgut und verbesserte Walzenmühle zur Durchführung dieses Verfahrens Download PDF

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Publication number
EP0348262B1
EP0348262B1 EP19890401594 EP89401594A EP0348262B1 EP 0348262 B1 EP0348262 B1 EP 0348262B1 EP 19890401594 EP19890401594 EP 19890401594 EP 89401594 A EP89401594 A EP 89401594A EP 0348262 B1 EP0348262 B1 EP 0348262B1
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EP
European Patent Office
Prior art keywords
rolls
transducer
ground
cylinders
grinding mill
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Revoked
Application number
EP19890401594
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English (en)
French (fr)
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EP0348262A1 (de
Inventor
Alain Chielens
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F C B
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F C B
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
    • B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
    • B02C4/00—Crushing or disintegrating by roller mills
    • B02C4/02—Crushing or disintegrating by roller mills with two or more rollers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
    • B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
    • B02C19/00—Other disintegrating devices or methods
    • B02C19/16—Mills provided with vibrators
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
    • B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
    • B02C4/00—Crushing or disintegrating by roller mills
    • B02C4/10—Crushing or disintegrating by roller mills with a roller co-operating with a stationary member
    • B02C4/18—Crushing or disintegrating by roller mills with a roller co-operating with a stationary member in the form of a bar

Definitions

  • the present invention relates to a process of fine grinding of minerals consisting in subjecting a layer of the product to be ground to a compression between two cylinders with parallel axes, rotating in opposite directions and elastically pushed towards one another.
  • said to be forced feed said to be forced feed, the spacing of the cylinders is adjusted to a low value and the mill is fed with a flow rate equal to several times the theoretical flow rate corresponding to this spacing.
  • the material thus forced between the cylinders causes their displacement at the cost of an overload of the pressure of the springs the greater the greater the flow of material.
  • the present invention provides another solution to this problem. It consists in subjecting the ground material to vibrations at low or medium frequency at its exit from the cylinders, in an area located as close as possible to the imaginary plane containing the axes of the cylinders.
  • the vibration frequency will be between 1 Hz and 1000 Hz.
  • These vibrations can be applied to the ground material by means of a transducer constituted, for example, by a bar with a triangular section, solid or hollowed out and in the latter case with contours. closed or not, placed between the cylinders with one of its edges situated as close as possible to the imaginary plane containing the axes of the cylinders and subjected to longitudinal and / or transverse vibrations by known means.
  • the vibrations could be applied by means of a roller of small diameter, with an axis parallel to the axes of the cylinders, and placed between the cylinders below the plane of the axes of the cylinders. Sufficient space will be provided between the transducer and at least one of the cylinders to allow the evacuation of the ground products.
  • This crusher consists essentially of two identical cylinders 10 and 12, with horizontal and parallel axes, elastically pushed towards one another by springs or by means of a hydro-pneumatic system. Both cylinders are rotated at the same speed and in opposite directions, as indicated by the arrows.
  • a bar 14 of triangular section arranged with one of its edges upward and symmetrically with respect to the plane of symmetry of the cylinders.
  • This bar is supported at its ends by elastic means or slides and is connected to a vibration generator 16, electromagnetic, unbalanced or of any other type, which makes it vibrate longitudinally and / or transversely.
  • Adjustment means are provided to adjust the position of the bar relative to the cylinders, in particular to compensate for wear, and maintain a predetermined clearance between the bar and the cylinders.
  • an instantaneous erasure device for the bar which can be a known device with springs, counterweight, hydraulic or other means, is provided to allow the passage of overwhelming elements.
  • the bearings of one of the cylinders are fixed and the bearings of the other cylinder are mounted on slides or pivoting arms to allow it to approach and move away from the first cylinder.
  • the mobile bearings are held in abutment by the elastic thrust means so as to maintain a minimum spacing between the cylinders.
  • the material to be ground is loaded above the cylinders in a chute supply 18, and the feed rate is significantly greater than the rate corresponding to the minimum spacing, fixed by the stops, so that the cylinders are maintained at a greater spacing by the layer of material which forms between them.
  • the grinding is carried out not only by crushing, under the action of the pressure exerted by the cylinders, but also by attrition between the particles, so that a high proportion of fine particles is formed.
  • the vibrations applied by the bar 14 to the layer of ground material causes the destruction of possible agglomerates in the ground product.
  • the frequency of the vibrations is chosen according to the nature of the materials to be ground and will be between 1 and 1000 Hertz.
  • the ground material is discharged through the slots provided between the cylinders and the bar, on either side of the latter.
  • the bar could be arranged asymmetrically very close to one of the cylinders, the crushed materials then being discharged through the slot made between the bar and the other cylinder.
  • the bar could possibly be replaced by a small diameter roller placed asymmetrically near one of the cylinders with its axis parallel to those of the cylinders.
  • the device for vibrating the bar may be provided with adjustment means making it possible to maintain the amplitude of the vibrations at a value sufficient to create the energy necessary to obtain the desired result: absence of agglomerates in the product leaving the mill.
  • this device is constituted by an electromagnetic vibrator, the frequency can be controlled by the amplitude so as to maintain the level of amplitude whatever the added mass of ground particles supported instantaneously by the bar.

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

Claims (5)

1. Verfahren zur Feinzerkleinerung von Mahlgut bei dem eine Mahlgutschicht zwischen zwei Walzen mit paralleler Achse (10,12), die sich in umgekehrter Richtung drehen und elastisch gegeneinander gedrückt werden, komprimiert wird, dadurch gekennzeichnet, daß das gemahlte Gut am Austritt aus den Walzen (10, 12) Schwingungen ausgesetzt wird, deren Frequenz zwischen 1 und 1000 Hertz liegt und die so gewählt wird, daß das gemahlte Gut praktisch keine Agglomerate mehr enthält, wobei diese Schwingungen durch einen länglichen Schwinger (14) beaufschlagt werden, der in Längsrichtung zwischen den Walzen (10, 12) und unter der Ebene (X - X), welche die Achsen besagter Walzen enthält, angeordnet ist, und daß besagter Schwinger (14) von mindestens einer der Walzen (10, 12) entfernt gehalten wird, um die Abfuhr des gemahlten Gutes zu erlauben.
2. Mühle zur Durchführung des Verfahrens gemäß Anspruch 1, dadurch gekennzeichnet, daß besagter Schwinger von einer vollen oder hohlen Stange (14) mit dreieckigem Querschnitt gebildet wird, die derart zwischen den Walzen (10, 12) angeordnet ist, daß sie mit mindestens einer der Walzen einen Durchgang zum Auslaß des gemahlten Gutes bildet.
3. Mühle zur Durchführung des Verfahrens gemäß Anspruch 1, dadurch gekennzeichnet, daß besagter Schwinger von einer Rolle kleinen Durchmessers gebildet wird, die parallel zu den Achsen besagter Walzen angeordnet ist, um mit einer dieser Walzen einen Durchgang zum Auslaß des gemahlten Gutes zu bilden.
4. Mühle gemäß Anspruch 2 oder 3, dadurch gekennzeichnet, daß besagter Schwinger mit einer Vorrichtung zur automatischen Einstellung der Schwingungsamplitude ausgerüstet ist.
5. Mühle gemäß Anspruch 2, 3 oder 4, dadurch gekennzeichnet, daß besagter Schwinger zwecks Durchlaß von nicht mahlbaren Körpern auf einer Schnellabsenkvorrichtung angeordnet ist.
EP19890401594 1988-06-24 1989-06-08 Verfahren zur Feinzerkleinerung von Mahlgut und verbesserte Walzenmühle zur Durchführung dieses Verfahrens Revoked EP0348262B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8808519A FR2633197B1 (fr) 1988-06-24 1988-06-24 Procede de broyage fin de mineraux et broyeur a cylindres perfectionne pour la mise en oeuvre de ce procede
FR8808519 1988-06-24

Publications (2)

Publication Number Publication Date
EP0348262A1 EP0348262A1 (de) 1989-12-27
EP0348262B1 true EP0348262B1 (de) 1992-04-29

Family

ID=9367689

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19890401594 Revoked EP0348262B1 (de) 1988-06-24 1989-06-08 Verfahren zur Feinzerkleinerung von Mahlgut und verbesserte Walzenmühle zur Durchführung dieses Verfahrens

Country Status (4)

Country Link
EP (1) EP0348262B1 (de)
ES (1) ES2030986T3 (de)
FR (1) FR2633197B1 (de)
GR (1) GR3004777T3 (de)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104056682A (zh) * 2014-06-06 2014-09-24 陈晨 辊板磨矿机

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1396711A (en) * 1921-08-15 1921-11-08 Johnston George Apparatus for pulverizing ore and the like
GB688165A (en) * 1949-12-30 1953-02-25 Miag Vertriebs Gmbh Improvements in or relating to comminuting devices in roller mills
DE3433577A1 (de) * 1984-09-13 1986-03-13 Hazemag Dr. E. Andreas GmbH & Co, 4400 Münster Walzenmuehle

Also Published As

Publication number Publication date
FR2633197B1 (fr) 1992-07-24
ES2030986T3 (es) 1992-11-16
EP0348262A1 (de) 1989-12-27
GR3004777T3 (de) 1993-04-28
FR2633197A1 (fr) 1989-12-29

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