EP1541238A1 - Revêtement pour broyeur tubulaire - Google Patents

Revêtement pour broyeur tubulaire Download PDF

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Publication number
EP1541238A1
EP1541238A1 EP04076748A EP04076748A EP1541238A1 EP 1541238 A1 EP1541238 A1 EP 1541238A1 EP 04076748 A EP04076748 A EP 04076748A EP 04076748 A EP04076748 A EP 04076748A EP 1541238 A1 EP1541238 A1 EP 1541238A1
Authority
EP
European Patent Office
Prior art keywords
cladding
panels
cylindrical body
ribs
exhibit
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Withdrawn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
EP04076748A
Other languages
German (de)
English (en)
Inventor
Walter Palladini
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.)
Certech Srl
Original Assignee
Certech Srl
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 Certech Srl filed Critical Certech Srl
Publication of EP1541238A1 publication Critical patent/EP1541238A1/fr
Withdrawn legal-status Critical Current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
    • B02C17/225—Lining for containers using rubber or elastomeric material

Definitions

  • Usual rotary drum mills typically comprise an internally-hollow cylindrical body, or drum, which rotates about a longitudinal axis thereof arranged horizontally or with a slight inclination to the horizontal.
  • the material to be milled and the grinding bodies are introduced into the drum; the bodies used for grinding or milling are usually constituted by balls made of a very hard material.
  • the grinding balls are agitated, and grind the material to be milled internally of the drum.
  • the drum In order to counter the friction with the grinding balls, the drum is internally clad with a high-resistance material, usually rubber or other elastomers.
  • the cladding comprises a series of panels which are fixed internally of the drum.
  • the panels exhibit a series of longitudinal reliefs, or raising bars, which draw the materials and the balls inside the drum in rotation up to a certain height, from which they then drop, falling onto the underlying materials.
  • the panels are fixed to the drum by bolts, the heads of which are lodged in seatings made in the base of the panels, the stalks of which pass through holes afforded in the drum, to be fastened externally with a nut.
  • the patent describes a rotary drum mill in which the cladding is composed of a series of panels which are connected to the internal surface of the drum by means of a coupling between shaped elements and corresponding channels.
  • the shaped elements are associated to the internal surface of the drum, while the channels are made in the backs of cladding panels in positions corresponding to lifter bars.
  • the dismounting of the panels is also extremely difficult, if done before the panels are completely worn out.
  • This operation is generally performed using a lever, such as a crowbar. In order to do this operation the operatives have to get inside the drum and detach the panels along the whole length of the drum.
  • a further disadvantage of the cladding described in patent no. IT 1291313 is that the ribs, in order to be inserted in the channels, have to be pointed. This conformation, though bevelled, causes stresses in the material constituting the panels, in rubber or other elastomer material, which stresses are extremely localised and can lead to cracking in the material. This is true both during the mounting operation and progressively during use of the mill, with the result that the working life of the cladding is drastically shortened.
  • the main aim of the invention is to provide a cladding for drum mills which obviates the above-described drawbacks in the prior art.
  • An advantage of the invention is that the cladding is extremely easy and fast to mount.
  • a further advantage of the invention is that the connection between the cladding and the drum is extremely stable and secure.
  • a further advantage of the invention is that the cladding is especially resistant to the formation of cracks and to wear.
  • the cladding comprises a plurality of panels 3 predisposed to cover an internal cylindrical surface 20 of an internally hollow cylindrical body 2 rotating about a longitudinal axis x thereof at a predetermined peripheral velocity.
  • the panels 3 are associated to the internal cylindrical surface 20 using means for connection.
  • the means for connection comprise a plurality of ribs 5 fixed by welding onto the internal cylindrical surface 20 of the cylindrical body 2, each of which exhibits a section which is perpendicular to the longitudinal axis of the cylindrical body 2 which section has at least one portion thereof arranged with an acute angle of inclination ⁇ with respect to the vector representing the peripheral velocity of the cylindrical body 2.
  • the means for connection further comprise a plurality of hollow seatings or channels 6, afforded at the lower surfaces 30 of the panels 3.
  • the lower surfaces 30 are predisposed to be contactingly coupled with the internal cylindrical surface 20 of the cylindrical body 2.
  • the channels 6 are counter-shaped with respect to the ribs 5 so that the ribs 5 can be coupled in the channels 6.
  • the ribs 5 and the channels 6 exhibit coupling surfaces 5b, 6b, which are inclined according to the acute angle of inclination ⁇ .
  • the coupling surfaces 6b define wedge-shaped portions 3c in the panels 3.
  • the coupling surfaces 5b, 6b are predisposed to enter into contact in the coupling between the ribs 5 and the channels 6.
  • the connection of the panels 3 to the internal cylindrical surface 20 of the cylindrical body 2 is extremely simple and rapid.
  • the panels 3 are arranged in succession on the internal cylindrical surface 20 so that the channels 6 are inserted, at least with one leader section, on the ribs 5. At this point it is sufficient to slide the panels 3 on the internal cylindrical surface 20 up until the ribs 5 are inserted in the respective channels 6.
  • the sliding and the following blocking of the panels 3 which lead to the correct insertion of the ribs 5 in the channels 6 can be obtained, for example, by rotating the cylindrical body 2.
  • each panel 3 Since the angle ⁇ is an acute angle with respect to the peripheral velocity of the cylindrical body 2, in the "rising" tract of the circular pathway, each panel 3, by effect of the rotation of the cylindrical body 2, inserts into one of the ribs 5 by dint of its own weight. The insertion effect is accentuated during the operation of the mill.
  • the material to be ground inside the cylindrical body 2 is partially drawn in rotation due to the friction between the panel 3 and the material itself.
  • the resultant of the friction forces between the material and each panel 3 thanks to the arrangement of the coupling surfaces 5b, 6b which are inclined according to the acute angle of inclination ⁇ , increases the insertion force of each rib 5 in the respective channel 6.
  • the wedge-shaped portions 3c are forced into corresponding complementary spaces defined between the ribs 5 and the internal cylindrical surface 20, solidly fixing the panels 3 to the internal cylindrical surface 20.
  • the panels 3 exhibit at least one longitudinal relief, known as a lifter bar 7, arranged at the opposite surface to the surface 30, so as to be projecting internalwards of the cylindrical body 2, and at least one channel 6 which is staggered downstream of the rotation direction with respect to the longitudinal relief. Further, the panels 3 at least partially exhibit a progressively-diminishing thickness in the direction of rotation.
  • the panels 3 exhibit a plurality of lifter bars 7 and a plurality of channels 6 staggering downstream of the rotation direction with respect to the corresponding lifter bars 7.
  • the lifter bars 7 are separated by portions 3 a of the panels 3 which each exhibit a progressively-diminishing thickness in the direction of rotation.
  • the staggered arrangement of the lifter bars 7 with respect to the channels 6 and the decreasing thickness of the panels 3 in the rotation direction of the cylindrical body 2 reduce the incidence of wear on the working life of the cladding.
  • the material to be ground in the cylindrical body 2 is drawn in rotation by the cylindrical body 2.
  • the material to be ground and the grinding balls are raised by effect of friction with the panels 3 and by the presence of the lifter bars 7 up to a certain height, at which, by effect of the rotation angle, they detach from the panels 3 and fall downwards.
  • the material to be ground and the grinding balls impact, at least partially, on the panels 3, and more precisely impact on the front side 7a, i.e.
  • Each rib 5 is constituted by at least one section, connected to the internal cylindrical surface 20 of the cylindrical body 2, which is defined by a shaped sheet of steel.
  • the two free edges of the fashioned sheet of steel are parallel and connected to the internal cylindrical surface 20, for example by welding.
  • the steel is shaped so that the coupling surface 5b is inclined by angle ⁇ .
  • the slots 11 afford access for the welding to the other free edge, otherwise difficult to access from the other side i.e. where the portion 3c inserts.
  • the element constituting the single rib 5 exhibits an external surface with is free of live edges. This greatly limits the chance of lacerations in the rubber due to the load exerted by the grinding balls and the grinding material.
  • the ribs 5 are arranged on the internal cylindrical surface 20 of the cylindrical body 2 and are parallel to the longitudinal axis x of the cylindrical body 2 itself.
  • the ribs 5 can be parallel to one another but inclined with respect to the longitudinal axis x; this can be required, for example, if the lifter bars 7, typically parallel to the channels 6, exhibit a certain inclination with respect to the longitudinal axis x.
  • the ribs 5 are preferably arranged at a constant angular distance and extend over the whole length of the cylindrical body 2.
  • the ribs 5 can also be arranged at a non-constant angular distance and/or can extend over only a part of the length of the cylindrical body 2.
  • the panels 3 each exhibit four edge surfaces 3b at which the panels 3 are joined to assemble the cladding. Some of the edge surfaces 3b are arranged to form a projecting end 9 of a panel 3 and others are arranged to form a recessed seating 10 which fits into the projecting end 9 of another, adjacently-arranged panel 3.
  • the invention offers important advantages. Firstly the cladding is extremely rapidly and easily mounted. It is sufficient to place the panels 3 on the internal cylindrical surface of the rotating cylindrical body and slide them slightly over the cylindrical surface. Thanks to the conformation of the ribs and the channels the connection between the cladding and the drum is extremely stable and secure and is further improved during mill operation. The position of the channels with respect to the lifter bars in each panel and the variable thickness of the panels themselves make the cladding especially resistant to the formation of cracks and to wear.

Landscapes

  • Engineering & Computer Science (AREA)
  • Food Science & Technology (AREA)
  • Crushing And Grinding (AREA)
EP04076748A 2003-12-11 2004-06-11 Revêtement pour broyeur tubulaire Withdrawn EP1541238A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ITMO20030337 2003-12-11
ITMO20030337 ITMO20030337A1 (it) 2003-12-11 2003-12-11 Rivestimento per mulino a tamburo rotante.

Publications (1)

Publication Number Publication Date
EP1541238A1 true EP1541238A1 (fr) 2005-06-15

Family

ID=34509485

Family Applications (1)

Application Number Title Priority Date Filing Date
EP04076748A Withdrawn EP1541238A1 (fr) 2003-12-11 2004-06-11 Revêtement pour broyeur tubulaire

Country Status (2)

Country Link
EP (1) EP1541238A1 (fr)
IT (1) ITMO20030337A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
RU2826402C1 (ru) * 2024-03-06 2024-09-09 Федеральное государственное бюджетное образовательное учреждение высшего образования "Ярославский государственный технический университет" ФГБОУВО "ЯГТУ" Шаровая мельница

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4039257A1 (de) * 1990-12-08 1992-06-11 Forsch Aufbereitung Innenauskleidung fuer rohrkugelmuehlen
WO1998016317A1 (fr) * 1996-10-15 1998-04-23 Christian Pfeiffer Maschinenfabrik Gmbh Revetement anti-usure, en particulier couche d'usure pour tubes broyeurs et/ou broyeurs a boulets
US5839490A (en) * 1998-03-17 1998-11-24 Svedala Industries, Inc. Rubber lining for corrugated debarking drum

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4039257A1 (de) * 1990-12-08 1992-06-11 Forsch Aufbereitung Innenauskleidung fuer rohrkugelmuehlen
WO1998016317A1 (fr) * 1996-10-15 1998-04-23 Christian Pfeiffer Maschinenfabrik Gmbh Revetement anti-usure, en particulier couche d'usure pour tubes broyeurs et/ou broyeurs a boulets
US5839490A (en) * 1998-03-17 1998-11-24 Svedala Industries, Inc. Rubber lining for corrugated debarking drum

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
RU2826402C1 (ru) * 2024-03-06 2024-09-09 Федеральное государственное бюджетное образовательное учреждение высшего образования "Ярославский государственный технический университет" ФГБОУВО "ЯГТУ" Шаровая мельница

Also Published As

Publication number Publication date
ITMO20030337A1 (it) 2005-06-12

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