EP3542904B1 - Mill for ceramic materials - Google Patents

Mill for ceramic materials Download PDF

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Publication number
EP3542904B1
EP3542904B1 EP19161067.4A EP19161067A EP3542904B1 EP 3542904 B1 EP3542904 B1 EP 3542904B1 EP 19161067 A EP19161067 A EP 19161067A EP 3542904 B1 EP3542904 B1 EP 3542904B1
Authority
EP
European Patent Office
Prior art keywords
unloading
loading
grille
opening
mill
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.)
Active
Application number
EP19161067.4A
Other languages
German (de)
French (fr)
Other versions
EP3542904A1 (en
Inventor
Valter 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 SpA A Socio Unico
Original Assignee
Certech SpA A Socio Unico
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Publication date
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Publication of EP3542904A1 publication Critical patent/EP3542904A1/en
Application granted granted Critical
Publication of EP3542904B1 publication Critical patent/EP3542904B1/en
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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
    • B02C17/183—Feeding or discharging devices
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
    • B24B31/00—Machines or devices designed for polishing or abrading surfaces on work by means of tumbling apparatus or other apparatus in which the work and/or the abrasive material is loose; Accessories therefor
    • B24B31/02—Machines or devices designed for polishing or abrading surfaces on work by means of tumbling apparatus or other apparatus in which the work and/or the abrasive material is loose; Accessories therefor involving rotary barrels
    • B24B31/03—Machines or devices designed for polishing or abrading surfaces on work by means of tumbling apparatus or other apparatus in which the work and/or the abrasive material is loose; Accessories therefor involving rotary barrels the workpieces being continuously-travelling
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
    • B24B31/00—Machines or devices designed for polishing or abrading surfaces on work by means of tumbling apparatus or other apparatus in which the work and/or the abrasive material is loose; Accessories therefor
    • B24B31/12—Accessories; Protective equipment or safety devices; Installations for exhaustion of dust or for sound absorption specially adapted for machines covered by group B24B31/00

Definitions

  • the present invention relates to a mill for grinding at least one material used in the ceramics industry, e.g. clay ceramics.
  • the invention relates in particular to a mill comprising a rotating hollow body, which defines a volume in which grinding bodies are arranged immersed in a liquid, typically water.
  • the grinding bodies have the function of grinding the material introduced into the volume itself, following the rotation of the mill about an axis of rotation and during such rotation.
  • the best performing mills perform their grinding action in a continuous cycle.
  • the introduction of the material to be ground and the extraction of the ground material are carried out concentrically to the axis of rotation of the mill, so that the hollow body can be kept in continuous rotation.
  • the grinding bodies are cyclically dragged upwards by the rotation of the hollow body and fall down once it reaches a position of maximum height. During these movements, the grinding bodies can accidentally enter the loading opening or unloading opening of the mill, causing occlusions or, in any case, exiting from the mill.
  • the mills are filled up to a level lower than that of the loading and unloading openings of the mill. This involves a considerable imbalance of the total mass of the mill with respect to the axis of rotation of the hollow body, and a consequent increase in the energy consumption required to keep the mill in rotation. On the other hand, it is not currently possible to raise the filling level of the mill, as in doing so the number of hollow bodies which tend to escape from the mill through the loading and unloading openings greatly increases.
  • the object of the present invention is to overcome the drawbacks of the currently available mills, preventing the grinding bodies from escaping from the mill and offering a solution which allows for easy maintenance of the internal parts of the mill.
  • the mill according to the present invention comprises a hollow body (2), rotating around an axis of rotation (X).
  • the hollow body (2) has a cylindrical shape, concentric with the axis of rotation (X), and is equipped with a loading head (21) and an unloading head (22) which close the hollow body (2) at its ends.
  • the two heads (21,22) are arranged substantially transverse to the axis of rotation (X).
  • Motor means are arranged to drive the hollow body (2) in rotation through a transmission.
  • the motor means and the transmission required for driving the rotation of the hollow body (2) are well known in the industry, and will therefore not be described in further detail.
  • the hollow body is equipped with a loading opening (2a), concentric to the axis of rotation (X), and an unloading opening (2b), concentric to the axis of rotation (X).
  • the loading opening (2a) is formed through the loading head.
  • Supply means not shown, can be connected to the loading opening (2a) for supplying the material to be subjected to grinding inside the hollow body (2).
  • the unloading opening (2b) is formed through the unloading head (22), to allow the outflow of the ground material.
  • the unloading opening (2b) can be connected to a duct which carries the ground material to a subsequent destination.
  • the material to be ground is fed to the hollow body (2) in an aqueous suspension.
  • a plurality of grinding bodies are also arranged inside the hollow body (2) which, cyclically rising and falling inside the hollow body (2) due to the rotation of the latter, carry out the grinding of the material.
  • the mill according to the present invention comprises a loading grille (3), arranged inside the hollow body (2) and located in front of the loading opening (2a), having a plurality of through openings (31).
  • the mill further comprises an unloading grille (4), arranged inside the hollow body (3) and located in front of the unloading opening (2b), having a plurality of through openings (41).
  • the two grilles (3,4) equipped with through openings (31,41), allow the flow of the aqueous suspension, while they do not allow the passage of the grinding bodies, which cannot therefore enter into the loading and unloading openings (2a, 2b).
  • the filling level of the hollow body (2) namely the level of the aqueous suspension containing the material to be ground, can be raised to above the axis of rotation (X), i.e. to above the level of the loading and unloading openings (2a, 2b), allowing a substantial reduction of the energy required for the rotation of the hollow body (2).
  • the loading grille (3) is associated with the loading head (21), in a frontal position with respect to the loading opening (2a).
  • the loading grille (3) is substantially concentric to the loading opening (2a).
  • the loading grille (3) has a concave conformation.
  • the concavity of the loading grille (3) is turned towards the loading opening (2a), so that a central area of the loading grille (3) is maintained at a certain distance from the loading head (21), to favour the inflow of material through the loading opening (2a).
  • the loading grille (3) has a truncoconical conformation, concentric to the loading opening (2a).
  • a base flange of the loading grille (3) is associated with the loading head (21), while the apex portion is placed in front of the loading opening (2a). This conformation is particularly effective to allow the inflow of material and, simultaneously, to keep the grinding bodies at a distance from the loading opening (2a).
  • the unloading grille (4) is associated with the unloading head (22), in a frontal position with respect to the unloading opening (2b).
  • the unloading grille (4) is substantially concentric to the unloading opening (2b).
  • the unloading grille (4) has a concave conformation.
  • the concavity of the unloading grille (4) is turned towards the unloading opening (2b), so that a central area of the unloading grille (4) is maintained at a certain distance from the unloading head (22), to favour the outflow of material through the unloading opening (2b).
  • the unloading grille (4) has a truncoconical conformation, concentric to the unloading opening (2b).
  • a base flange of the unloading grille (4) is associated with the unloading head (22), while the apex portion is placed in front of the unloading opening (2b). This conformation is particularly effective to allow the outflow of material and, simultaneously, to keep the grinding bodies at a distance from the unloading opening (2b).
  • the mill according to the present invention provides important advantages.
  • the presence of the loading grille (3) which prevents the entry of the grinding bodies in the loading opening (2a), makes it possible to raise the level of filling of the mill well above the axis of rotation (X).
  • This raise in level reduces the eccentricity of the total mass of the mill, i.e. brings the centre of the hollow body and the mass contained therein (2) closer to the axis of rotation (X), so that the energy needed for the rotation of the hollow body (2) is drastically reduced compared to the currently available mills.
  • the raising of the filling level in the hollow body (2) also makes it possible to reduce the processing time.
  • the use of the unloading grille (4) makes it possible to increase the advantages of the invention, insofar as it excludes the possibility that the grinding bodies can enter into the unloading opening (2b).

Description

  • The present invention relates to a mill for grinding at least one material used in the ceramics industry, e.g. clay ceramics.
  • The invention relates in particular to a mill comprising a rotating hollow body, which defines a volume in which grinding bodies are arranged immersed in a liquid, typically water. The grinding bodies have the function of grinding the material introduced into the volume itself, following the rotation of the mill about an axis of rotation and during such rotation.
  • The best performing mills perform their grinding action in a continuous cycle. In essence, the introduction of the material to be ground and the extraction of the ground material are carried out concentrically to the axis of rotation of the mill, so that the hollow body can be kept in continuous rotation.
  • During operation of the mill, the grinding bodies are cyclically dragged upwards by the rotation of the hollow body and fall down once it reaches a position of maximum height. During these movements, the grinding bodies can accidentally enter the loading opening or unloading opening of the mill, causing occlusions or, in any case, exiting from the mill.
  • To limit this drawback, the mills are filled up to a level lower than that of the loading and unloading openings of the mill. This involves a considerable imbalance of the total mass of the mill with respect to the axis of rotation of the hollow body, and a consequent increase in the energy consumption required to keep the mill in rotation. On the other hand, it is not currently possible to raise the filling level of the mill, as in doing so the number of hollow bodies which tend to escape from the mill through the loading and unloading openings greatly increases.
  • An example of prior art mill, which solves the above summarized technical problem, is disclosed in publication WO2015059591 . Such publication discloses a mill provided with a loading and an unloading grille. Both grilles are attached to an internal structure of the mill, such that it is not possible to easily remove them for any purpose.
  • The object of the present invention is to overcome the drawbacks of the currently available mills, preventing the grinding bodies from escaping from the mill and offering a solution which allows for easy maintenance of the internal parts of the mill.
  • Characteristics and advantages of the present invention will more fully emerge from the following detailed description of an embodiment of the invention, as illustrated in a non-limiting example in the accompanying figures, in which:
    • figure 1 shows a schematic sectional view of a mill according to the present invention, on a section plane which contains the axis or rotation (X) of the mill;
    • figure 2 shows a sectional view on the plane II-II of figure 1;
    • figure 3 shows a sectional view on the plane III-III of figure 1.
  • The mill according to the present invention comprises a hollow body (2), rotating around an axis of rotation (X). The hollow body (2) has a cylindrical shape, concentric with the axis of rotation (X), and is equipped with a loading head (21) and an unloading head (22) which close the hollow body (2) at its ends. The two heads (21,22) are arranged substantially transverse to the axis of rotation (X). Motor means, not shown, are arranged to drive the hollow body (2) in rotation through a transmission. The motor means and the transmission required for driving the rotation of the hollow body (2) are well known in the industry, and will therefore not be described in further detail.
  • The hollow body is equipped with a loading opening (2a), concentric to the axis of rotation (X), and an unloading opening (2b), concentric to the axis of rotation (X). The loading opening (2a) is formed through the loading head. Supply means, not shown, can be connected to the loading opening (2a) for supplying the material to be subjected to grinding inside the hollow body (2). The unloading opening (2b) is formed through the unloading head (22), to allow the outflow of the ground material. The unloading opening (2b) can be connected to a duct which carries the ground material to a subsequent destination.
  • As is known, the material to be ground is fed to the hollow body (2) in an aqueous suspension. A plurality of grinding bodies are also arranged inside the hollow body (2) which, cyclically rising and falling inside the hollow body (2) due to the rotation of the latter, carry out the grinding of the material.
  • Advantageously, the mill according to the present invention comprises a loading grille (3), arranged inside the hollow body (2) and located in front of the loading opening (2a), having a plurality of through openings (31).
  • The mill further comprises an unloading grille (4), arranged inside the hollow body (3) and located in front of the unloading opening (2b), having a plurality of through openings (41).
  • The two grilles (3,4), equipped with through openings (31,41), allow the flow of the aqueous suspension, while they do not allow the passage of the grinding bodies, which cannot therefore enter into the loading and unloading openings (2a, 2b). In addition, thanks to the presence of the two grilles (3,4), the filling level of the hollow body (2), namely the level of the aqueous suspension containing the material to be ground, can be raised to above the axis of rotation (X), i.e. to above the level of the loading and unloading openings (2a, 2b), allowing a substantial reduction of the energy required for the rotation of the hollow body (2). Without the grilles (3,4) this condition would be substantially impossible, because the partial floating of the grinding bodies in the aqueous suspension would accentuate the tendency of the latter to enter into the loading and unloading openings (2a, 2b). The two grilles (3,4) instead retain the grinding bodies inside the hollow body (2).
  • In the embodiment shown, the loading grille (3) is associated with the loading head (21), in a frontal position with respect to the loading opening (2a). The loading grille (3) is substantially concentric to the loading opening (2a). Preferably, the loading grille (3) has a concave conformation. The concavity of the loading grille (3) is turned towards the loading opening (2a), so that a central area of the loading grille (3) is maintained at a certain distance from the loading head (21), to favour the inflow of material through the loading opening (2a). For example, the loading grille (3) has a truncoconical conformation, concentric to the loading opening (2a). A base flange of the loading grille (3) is associated with the loading head (21), while the apex portion is placed in front of the loading opening (2a). This conformation is particularly effective to allow the inflow of material and, simultaneously, to keep the grinding bodies at a distance from the loading opening (2a).
  • In the embodiment shown, the unloading grille (4) is associated with the unloading head (22), in a frontal position with respect to the unloading opening (2b). The unloading grille (4) is substantially concentric to the unloading opening (2b). Preferably, the unloading grille (4) has a concave conformation. The concavity of the unloading grille (4) is turned towards the unloading opening (2b), so that a central area of the unloading grille (4) is maintained at a certain distance from the unloading head (22), to favour the outflow of material through the unloading opening (2b). For example, the unloading grille (4) has a truncoconical conformation, concentric to the unloading opening (2b). A base flange of the unloading grille (4) is associated with the unloading head (22), while the apex portion is placed in front of the unloading opening (2b). This conformation is particularly effective to allow the outflow of material and, simultaneously, to keep the grinding bodies at a distance from the unloading opening (2b).
  • The mill according to the present invention provides important advantages.
  • The presence of the loading grille (3), which prevents the entry of the grinding bodies in the loading opening (2a), makes it possible to raise the level of filling of the mill well above the axis of rotation (X). This raise in level reduces the eccentricity of the total mass of the mill, i.e. brings the centre of the hollow body and the mass contained therein (2) closer to the axis of rotation (X), so that the energy needed for the rotation of the hollow body (2) is drastically reduced compared to the currently available mills. The raising of the filling level in the hollow body (2) also makes it possible to reduce the processing time. The use of the unloading grille (4) makes it possible to increase the advantages of the invention, insofar as it excludes the possibility that the grinding bodies can enter into the unloading opening (2b).

Claims (5)

  1. A mill for grinding a material, comprising: a hollow body (2), rotating around an axis of rotation (X) and provided with a loading opening (2a), concentric to the axis of rotation (X), and an unloading opening (2b), concentric to the axis of rotation (X); a loading head (21), concentric to the axis of rotation (X), through which the loading opening (2a) is arranged; an unloading head (22), concentric to the axis of rotation (X), through which the unloading opening (2b) is arranged; a loading grille (3), arranged inside the hollow body (3) and located in front of the loading opening (2a), having a plurality of through openings (31); an unloading grille (4), arranged inside the hollow body (2) and located in front of the unloading opening (2b), having a plurality of through openings (41);
    the loading grille (3) has a concave conformation, wherein the concavity of the loading grille (3) is facing towards the loading opening (2a); the unloading grille (4) has a concave conformation, wherein the concavity of the unloading grille (4) is facing towards the unloading opening (2b); characterised in that: the loading grille (3) has a base flange which is associated to the loading head (21); the unloading grille (4) has a base flange which is associated to the unloading head (22).
  2. The mill according to claim 1, wherein the loading grille (3) is truncoconical.
  3. The mill according to claim 2, wherein the loading grille (3) is concentric to the loading opening (2a).
  4. The mill according to claim 1, wherein the unloading grille (4) is truncoconical.
  5. The mill according to claim 4, wherein the unloading grille (4) is concentric to the unloading opening (2b).
EP19161067.4A 2018-03-22 2019-03-06 Mill for ceramic materials Active EP3542904B1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
IT102018000003874A IT201800003874A1 (en) 2018-03-22 2018-03-22 Mill for ceramic materials

Publications (2)

Publication Number Publication Date
EP3542904A1 EP3542904A1 (en) 2019-09-25
EP3542904B1 true EP3542904B1 (en) 2021-04-07

Family

ID=62597904

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19161067.4A Active EP3542904B1 (en) 2018-03-22 2019-03-06 Mill for ceramic materials

Country Status (5)

Country Link
EP (1) EP3542904B1 (en)
CN (1) CN110293479B (en)
BR (1) BR102019005369B1 (en)
ES (1) ES2880557T3 (en)
IT (1) IT201800003874A1 (en)

Family Cites Families (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1642632A (en) * 1926-02-25 1927-09-13 Harry W Titgen Tumbling mill
GB278214A (en) * 1926-12-06 1927-10-06 Traylor Engineering And Mfg Co Improvements in and relating to ball mills
GB337911A (en) * 1929-09-27 1930-11-13 Harold Sibree Rexworthy Improvements in grinding or crushing apparatus
BE829565A (en) * 1974-07-25 1975-09-15 ELEVATOR WALL, ESPECIALLY INTENDED TO BE MOUNTED IN A TUBULAR CRUSHER
JPS5953157A (en) * 1982-09-17 1984-03-27 Tipton Mfg Corp Planetary rotary type barrel processing apparatus
LU85767A1 (en) * 1985-02-08 1986-09-02 Communition Tech Comminutec DEVICE FOR ADJUSTING THE TIME OF RETENTION OF MATERIAL IN A CRUSHER
CN85106019B (en) * 1985-08-27 1987-10-28 赖博尔德-斯特里克股份公司 Annular gap type ball grinder
CN2212449Y (en) * 1995-01-08 1995-11-15 王建国 Vertical slender crusher
JP2913473B2 (en) * 1997-01-31 1999-06-28 株式会社チップトン Eddy current barrel processing machine having gap adjusting function, method for forming escape layer, and gap adjusting method
EP0937503A1 (en) * 1998-02-20 1999-08-25 Magotteaux International S.A. Discharging device for a wet grinding mill
US7134623B2 (en) * 2001-05-17 2006-11-14 Rader Companies Hammermill
TWM255758U (en) * 2003-12-11 2005-01-21 Jr-Shin Guo Centrifugal grinding machine
ITRE20050011A1 (en) * 2005-02-11 2006-08-12 Sacmi CONNECTION SYSTEM BETWEEN CONTINUOUS MILLS IN SERIES OF A MILLING PLANT
ATE361146T1 (en) * 2005-05-19 2007-05-15 Buehler Ag AGITATOR MILL
JP5555551B2 (en) * 2010-06-14 2014-07-23 株式会社日高ファインテクノロジーズ Grinding apparatus and grinding method
ITMO20130299A1 (en) * 2013-10-21 2015-04-22 Mario Dazzi MILLING PLANT

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
None *

Also Published As

Publication number Publication date
BR102019005369B1 (en) 2024-02-20
CN110293479B (en) 2022-10-04
ES2880557T3 (en) 2021-11-24
CN110293479A (en) 2019-10-01
EP3542904A1 (en) 2019-09-25
BR102019005369A2 (en) 2019-10-08
IT201800003874A1 (en) 2019-09-22

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