EP0487430A1 - Kugelmühle mit quer zur Achse liegenden Rollbahnen und mit diesen Bahnen versehene Panzerungsplatten - Google Patents

Kugelmühle mit quer zur Achse liegenden Rollbahnen und mit diesen Bahnen versehene Panzerungsplatten Download PDF

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Publication number
EP0487430A1
EP0487430A1 EP91403165A EP91403165A EP0487430A1 EP 0487430 A1 EP0487430 A1 EP 0487430A1 EP 91403165 A EP91403165 A EP 91403165A EP 91403165 A EP91403165 A EP 91403165A EP 0487430 A1 EP0487430 A1 EP 0487430A1
Authority
EP
European Patent Office
Prior art keywords
ferrule
tracks
lateral
plates
axis
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.)
Withdrawn
Application number
EP91403165A
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English (en)
French (fr)
Inventor
Benjamin Cambier
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Publication of EP0487430A1 publication Critical patent/EP0487430A1/de
Withdrawn legal-status Critical Current

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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
    • B02C17/00—Disintegrating by tumbling mills, i.e. mills having a container charged with the material to be disintegrated with or without special disintegrating members such as pebbles or balls
    • B02C17/18—Details
    • B02C17/22—Lining for containers

Definitions

  • the present invention relates to the grinding of material in a rotary mill containing grinding bodies, such as balls, in which the grinding plates covering the inner wall of the shell are provided with tracks for the grinding bodies. It relates more particularly to a crusher of this type and a shielding plate specially designed to equip said crusher.
  • the grinding is obtained thanks to the shocks and multiple contacts between the material and the balls during the rotation of the ferrule.
  • We have sought in various ways to improve the efficiency of these shredders for example by giving certain suitable shapes to the armor plates lining the internal wall of the shell, in particular: formed in steps and running tracks.
  • the stepped shape allows the balls to be raised during the rotation of the ferrule so that the raised balls fall on the material located in the lower part of the ferrule.
  • the balls crush the material that has accumulated on these tracks.
  • the aim which the applicant has set is to bring a substantial improvement to the efficiency of a ball mill whose armor plates are provided with rolling tracks.
  • the applicant considers that all the variants proposed, in particular in document EP.0388294, are not such as to bring about such an improvement.
  • the crusher according to the invention is a rotary ball mill whose ferrule is fitted with armor plates provided with raceways. Typically, certain armor plates form a step towards the axis of rotation of the ferrule, at least one face of which is provided with rolling tracks, say lateral.
  • the raceways are concave grooves made in the thickness of the armor plate whose concavity is such that the contact between the ball and the groove, when the ball rolls on the raceway, takes place in an arc of a circle. or possibly two contact points.
  • the plane of symmetry of such grooves is transverse with respect to the axis of rotation of the ferrule.
  • the plane of symmetry of said grooves is offset by an angle ( ⁇ ) at least 15 ° relative to said transverse plane.
  • the primary advantage of the invention consists in the possibility of superimposing several rolling tracks at different heights on the same side of the recess. These are the balls of several layers accumulated on the armor plates which run through the side tracks, while traditionally only the balls of the last layer, resting on the bottom of the shell, have a crushing action on the material on the tracks of rolling.
  • a mill of a determined length it is possible for a mill of a determined length to increase the number of rolling tracks, consequently to increase the effective exchange surface between the balls and the material and therefore the efficiency of grinding.
  • the plates with lateral raceways equip in a first version the substantially frustoconical wall of entry and / or exit of the ferrule, forming several continuous lateral tracks at different heights with respect to the axis of the ferrule.
  • the plates with lateral rolling tracks are aligned transversely on the internal wall of the ferrule so as to form a continuous recess towards the axis of the ferrule, said recess comprising on its two faces several continuous lateral tracks at different heights by relative to the axis of the ferrule.
  • Such a transverse alignment of armor plates is hereinafter referred to as cross row.
  • the balls in contact with the lateral tracks can pass through them without disturbance or discontinuity.
  • the internal wall of the ferrule is equipped with transverse rows of armor plates with recess and lateral tracks, alternating with rows of armor plates without recess, advantageously at the rate of one row of plates with side tracks in two rows.
  • the recesses of two successive rows of plates provided with lateral tracks delimit a kind of annular cavity inside which balls will move during the rotation of the ferrule. During this movement, some balls will roll on the tracks of the traditional armor plates and others will roll on the side tracks formed in the recesses.
  • a shielding plate intended to equip a ball mill.
  • Such a plate comprises, in a known manner, concave grooves forming rolling tracks for the balls.
  • the external part of the plate intended to be turned towards the inside of the shell, has a recess, the two faces of which have several concave grooves at different heights corresponding to the lateral raceways.
  • the armor plate with lateral tracks consists of a symmetrical metal part having a T-cross section, the bar at the top of which corresponds to the lower part of the plate and the median shoulder of which corresponds to the offset in the two faces of which the concave grooves are made.
  • the two opposite faces of the median shoulder are inclined towards one another, preferably at an angle between 1.5 and 4 °.
  • the T-section armor plate may also have concave grooves made in the connection zone between the median shoulder and the lower part of the plate.
  • the ball mill 1 consists of a ferrule 3 of cylindrical shape whose inlet 4 and outlet 5 faces are substantially frustoconical and terminated by cylindrical supply lines 6 and discharge lines 7 for the material to be ground. This ferrule 3 is rotated about its horizontal axis 8 by known means and not shown.
  • the inner wall of the ferrule 3 is equipped with shielding plates of a type known from document EP.0388294. These plates 9 are regularly arranged around the periphery of the shell so as to form a transverse row 10.
  • the external face that is to say that which faces towards the inside of the shell, plates 9 is provided with two concave grooves forming two rolling tracks 11 for the balls 2.
  • These so-called bottom running tracks 11 have a concavity whose plane of symmetry is transverse with respect to the axis of rotation 8 of the shell.
  • transverse row 10 of known armor plates 9 defines, for example, two raceways 11, substantially continuous all along the inner periphery of the ferrule 3.
  • the inner wall of the ferrule 3 is also equipped with shielding plates 12 characteristic of the invention.
  • These plates 12 have a median shoulder 13 which is directed towards the axis 8 of rotation of the ferrule 3 and the two faces of which are provided with several concave grooves forming the lateral rolling tracks 14 for the balls 2.
  • These lateral rolling tracks 14 have a concavity whose plane of symmetry makes an angle ⁇ from 30 ° to 90 ° with the plane transverse to the axis of rotation 8 of the shell.
  • the plates 12 of the new type are regularly placed around the periphery of the shell 3 so as to form a transverse row 15.
  • the inner cylindrical part 16 of the shell 3 is provided with a certain number of transverse rows of armor plates, a row 15 of plates 12 with lateral runways 14 alternating with a row 10 of plates 9 with bottom runways 11.
  • the inner wall of the substantially frustoconical portions 4.5 of the shell 3 is also equipped with armor plates 17 provided with lateral rolling tracks 18.
  • the shell balls 2 For its operation, there are in the shell balls 2 in sufficient number to occupy a height h of about one third of the internal diameter H of the shell 3.
  • the material to be ground has been introduced through the inlet pipe 6 and remains between and above the balls 2.
  • the armor plates can also have a stepped profile, as described in the aforementioned document EP 0388294 so as to ensure the lifting of the balls 2 during the rotation of the ferrule 8. They can also be arranged so as to delimit the shoveling cavities for the material and have a configuration such that the shoveled material pours into the zone of fall of the balls 2 during the rotation of the grinder.
  • the median shoulders 13,13 ′ of two consecutive transverse rows 15,15 ′ form for the balls 2 a shaped receptacle annular.
  • balls 19 furthest at the bottom are in contact with the bottom raceways 11 of the plates 9 of the intermediate row 10, and balls 20 on the side are in contact with the side raceways 14 of the shoulders 13 , 13 ′ of the plates 12,12 ′.
  • the grinding action due to this crushing of the material by balls traversing the raceways is proportional to the number of raceways.
  • the advantage of the invention lies in the very appreciable increase in the number of rolling tracks, thanks to the superposition of these tracks at different heights in the mass of accumulated balls. Traditionally only the bottom balls 19 had this crushing action. Thanks to the invention, balls 20 of the upper layers can have this action if they are in contact with the lateral raceways 14 formed in the faces of the median shoulders 13,13 ′ of the bottom plates 12 or even with the lateral rolling tracks 18 made in the plates 17 lining the inlet 4 and outlet 5 faces of the shell 3.
  • FIG. 3 illustrates the cross section of a plate 12 with a median shoulder 13, each face 21, 22 of which is provided with five lateral rolling tracks 14.
  • the cross section of the plate 12 has the general shape of an inverted tee.
  • the lower part 23, corresponding to the bar at the top of the tee, is intended to bear on the internal wall of the ferrule 3.
  • the plate 12 is a one-piece metal part having a longitudinal plane of symmetry BB ′.
  • the two faces 21, 22 of the median shoulder 13 are slightly inclined towards one another. Each of them makes an angle of the order of 2 ° with the plane of symmetry BB ′. This slight the aim of tilting is to prevent the balls 2 from being wedged in the annular receptacle, described above, during the rotation of the grinder.
  • the two faces 21, 22 each have five regularly spaced concave tracks 14.
  • the depth e of each track is for example 6mm for balls whose average diameter is 25mm.
  • the angle at the center ⁇ corresponding to the track is around 60 °.
  • the concavity of the lowest runway 24 extends into the lower part 23 so that the angle at the center ⁇ is of the order of 120 °.
  • all the lateral tracks 14 have the same concentric direction with respect to the axis of rotation 8 of the ferrule 3, so that the balls 20 accumulated on each other can remain at the same level in the ferrule by traversing said tracks 14.
  • the invention is not limited to the embodiment which has been described by way of non-exhaustive example but covers all the variants.
  • the height of the recesses, the number of lateral tracks, the depth of these tracks are to be determined according to the operating conditions of the mill.

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  • Engineering & Computer Science (AREA)
  • Food Science & Technology (AREA)
  • Crushing And Grinding (AREA)
EP91403165A 1990-11-22 1991-11-22 Kugelmühle mit quer zur Achse liegenden Rollbahnen und mit diesen Bahnen versehene Panzerungsplatten Withdrawn EP0487430A1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9014837A FR2669558A1 (fr) 1990-11-22 1990-11-22 Broyeur a boulets a pistes de roulement laterales et plaques de blindage pourvues de telles pistes.
FR9014837 1990-11-22

Publications (1)

Publication Number Publication Date
EP0487430A1 true EP0487430A1 (de) 1992-05-27

Family

ID=9402655

Family Applications (1)

Application Number Title Priority Date Filing Date
EP91403165A Withdrawn EP0487430A1 (de) 1990-11-22 1991-11-22 Kugelmühle mit quer zur Achse liegenden Rollbahnen und mit diesen Bahnen versehene Panzerungsplatten

Country Status (2)

Country Link
EP (1) EP0487430A1 (de)
FR (1) FR2669558A1 (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102247917A (zh) * 2011-01-10 2011-11-23 朱海良 球磨机改进结构

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1460796A (en) * 1920-04-05 1923-07-03 Hedburg Eric Lining for ball mills
DE452305C (de) * 1927-11-08 Gerhard Zarniko Zwischen- oder Auslaufwaende in Trommel-, Rohr- o. dgl. Muehlen
FR2054238A5 (de) * 1969-07-31 1971-04-16 Slegten Sa
GB1284053A (en) * 1971-03-23 1972-08-02 Smidth & Co As F L Improvements in tube mills

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE452305C (de) * 1927-11-08 Gerhard Zarniko Zwischen- oder Auslaufwaende in Trommel-, Rohr- o. dgl. Muehlen
US1460796A (en) * 1920-04-05 1923-07-03 Hedburg Eric Lining for ball mills
FR2054238A5 (de) * 1969-07-31 1971-04-16 Slegten Sa
GB1284053A (en) * 1971-03-23 1972-08-02 Smidth & Co As F L Improvements in tube mills

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102247917A (zh) * 2011-01-10 2011-11-23 朱海良 球磨机改进结构

Also Published As

Publication number Publication date
FR2669558A1 (fr) 1992-05-29

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