EP1023969A1 - Device for grinding ceramic materials and apparatus comprising the device - Google Patents

Device for grinding ceramic materials and apparatus comprising the device Download PDF

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Publication number
EP1023969A1
EP1023969A1 EP99125366A EP99125366A EP1023969A1 EP 1023969 A1 EP1023969 A1 EP 1023969A1 EP 99125366 A EP99125366 A EP 99125366A EP 99125366 A EP99125366 A EP 99125366A EP 1023969 A1 EP1023969 A1 EP 1023969A1
Authority
EP
European Patent Office
Prior art keywords
cylindrical body
rollers
ground
product
pairs
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Withdrawn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
EP99125366A
Other languages
German (de)
English (en)
French (fr)
Inventor
Cleo Caverio
Renato Bossetti
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.)
Siti SpA Impianti Termoelettrici Industriali Soc
Original Assignee
Siti SpA Impianti Termoelettrici Industriali Soc
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 Siti SpA Impianti Termoelettrici Industriali Soc filed Critical Siti SpA Impianti Termoelettrici Industriali Soc
Publication of EP1023969A1 publication Critical patent/EP1023969A1/en
Withdrawn legal-status Critical Current

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Classifications

    • 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

Definitions

  • the invention relates to a device for grinding ceramic materials and to an apparatus that includes the device.
  • these devices are formed by a cylindrical body which is arranged substantially horizontally and is internally lined with rubber or with a nonferrous material which does not contaminate the ceramic product.
  • the rubber lining is meant to avoid the separation and abrasion of metallic particles which might contaminate the ground product.
  • the inside of the cylindrical body is loaded, to approximately half of its volume, with grinding media made of nonferrous material. By turning the cylindrical body, the grinding media are moved and, by rolling, grind the product to be ground, which is fed into the cylindrical body.
  • the grinding media can be, for example, silica marbles.
  • the cylindrical body has two openings at its two opposite ends, so that the product to be ground can be fed from one of the two openings and removed from the other opening. It is also possible to provide dividing partitions along the cylinder, so as to adjust the movement of the product to be ground along the length of the cylindrical body.
  • the ceramic material can so be ground to powder.
  • This powder is dry pressed to obtain a preformed article, such as a tile, a plate, a slate, or a refractory brick. Then the preformed article is fired in a kiln to obtain the final product.
  • Another type of mill used in the above defined field of the invention, which uses a cylindrical rotating body which is rested on rubber-covered motorized rollers.
  • the rubber provided on the rollers allows to increase the friction coefficient in the coupling between the rollers and the rotating body, so as to allow to transmit the other forces required to turn the cylindrical body.
  • the driving and supporting rollers must have an elongated shape, in order to increase the surface of contact with the cylindrical rotating body and therefore allow to transmit the forces required to turn the cylindrical rotating body.
  • this entails an extremely difficult coupling between the supporting and driving rollers and the structure of the mill, since even small imperfections can compromise the possibility of transmitting the necessary forces.
  • the pressure on the rubber is extremely high.
  • the weight of the rotating cylinder alone can exceed 58 tons and is increased by the weight of the grinding media, which can exceed 76 tons, by the weight of the rubber covering of the rotating body, which can exceed 35 tons, and also of course by the considerable weight of the material to be ground and of the corresponding mixture water.
  • the rubber of the rollers is therefore subjected to extremely high pressures which tend to damage it and therefore to compromise its operation. To reduce these pressures, it is necessary to further increase the length of the rubber-covered support rollers, consequently increasing the geometric difficulties in operation.
  • US 5,586,925 and JP 55054171 A-53123799 disclose an apparatus for artificially weathering marble and stones with a drum. So it relates to a completely different aim. Furthermore it is supported laterally along its rotating with the above remarked drawbacks. Finally it can be loaded and discharged only by a lateral opening and therefore can allow only a batch working and not a continuous working as required in the field of the present application.
  • US 5, 029, 415 discloses an apparatus for centrifugal hydromechanical cleaning and polishing of billets. So, also in this case the field is completely different. Fuerthermore it can be loaded and discharged by openings arranged near the lateral wall of the cylinder and cannot work continuously as required in the field of the present invention.
  • US 2 210 584 discloses a drum for removing flash from molded plastic articles and polishing them. So the field of the invention is even more remote. Also, the drum is perforated so it cannot keep water inside, as required in the filed of the present invention. Finally no grinding body is provided.
  • US 2,875,894 discloses a drum for separating whiskers from nails. So the field of completely different from the present invention. Also one side of the drum is open so that it is impossible to keep water and the grinding media inside. In fact no grinding media whatsoever is provided.
  • EP 0 714 703 discloses only the inner lining of a drum.
  • the aim of the present invention is therefore to overcome the above drawbacks with a device for grinding ceramic materials, according to claim 1.
  • the rollers are preferably made of a material with a Brinell hardness BH of no less than 150, preferably no less than 350.
  • the rollers are preferably made of metallic material.
  • the cylindrical body has a length of no less than 8000 mm, more preferably no less than 10000 mm.
  • the invention furthermore relates to an apparatus for manufacturing ceramic products which includes a device as described, a press for pressing the product ground in the device, and a kiln for firing the ground product.
  • a press suitable to operate in this apparatus
  • European patent no. 594217 in the name of the same Applicant.
  • European patent No. 750169 and to European patent no. 866296.
  • the device according to the invention includes a cylindrical body 10 which is arranged substantially horizontally.
  • the cylindrical body 10 is loaded with grinding media, not shown in the figures, which occupy approximately half of its volume.
  • the cylindrical body 10 has two openings 11 and 12, arranged at its ends, for feeding the product to be ground and for removing the ground product.
  • the cylindrical body is supported by two pairs of rollers 13 and 14.
  • the two pairs of rollers 13 and 14 engage an external surface 15 of the cylindrical body 10.
  • the rotation of the cylindrical body 10 is entrusted to a belt drive 16 which engages the outer surface 15 of the cylindrical body 10.
  • the belt drive 16 is arranged externally with respect to the pairs of rollers 13 and 14. In this manner it is possible to easily replace the belts 17 without having to lift the cylindrical body 10.
  • the belt drive 16 includes, in the embodiment shown in the figures, two transmission assemblies 18 arranged on the opposite sides of the cylindrical body 10 and externally with respect to the pairs of rollers 13 and 14.
  • Each transmission assembly includes a motor 19 and a series of belts 17.
  • the series of belts 17 is formed by a plurality of V-belts.
  • each transmission assembly 18 and 19 is mounted so that it can oscillate on the pivot 20, so as to allow to adjust the tension of the belts by virtue of the fixing member 21.
  • the invention allows to achieve the intended aim, and in particular it is possible to eliminate the large and expensive bearings, to eliminate the rubber-covered motorized rollers and to eliminate the gears, with a system which is particularly simple and effective even in the field of the present invention, in which abrasive ceramic materials are present.
  • the rubber belts in fact are not penalized in this work environment.
  • the belts 17 allow to transmit, in the claimed embodiment, all the forces required for the rotation of the cylindrical body 10, even in the initial step, when the torques are very high.
  • the couplings are very simple, since the pairs of rollers 13 and 14 need no particular adjustments because the coupling is a metal-to-metal coupling with limited contact surfaces and is therefore very simple and reliable without requiring difficult alignments between the rollers and the cylindrical body 10.
  • the system is very cheap both to manufacture and to maintain, and even any replacement of worn belts is a very quick operation which does not require stopping the system arranged downstream of the mill.
  • the bases of the cylindrical body 10, 22 and 23 are no longer affected by mechanical stresses, since they do not have to support bearings, and therefore they can be manufactured much more simply and cheaply.
  • the inlet 11 and the outlet 12 can be provided much more simply, since there are no mechanical stresses in these regions. Furthermore, the operations for feeding the granular material to be ground and for removing the ground material are simplified; also the feeding of the grinding media to the cylindrical body can be arranged automatically. An improved reliability is achieved since there is no more risk to contaminate the bearing with ceramic material and water. because in the region there are no delicate bearings which might be contaminated by the ceramic material or by water.
  • pairs of rollers 13 and 14 are supported by very small bearings which as such entail simple procurement and a much lower cost.
  • the invention is susceptible of numerous modifications and variations; accordingly, the belts 17 can be provided with various different configurations and the motorization and tensioning means of the belts can be modified, according to what is known to the technician expert in the field.
  • the pairs of support rollers 13 and 14 can also be provided with various configurations, all of which are within the scope of the same inventive concept.
  • the outer surface 15 can be obtained directly on the body of the cylindrical body 10, as particularly represented in figures 1 to 3, or can be obtained by two rings that are assembled on the cylindrical body 10, with particular reference to figures 4 to 6. In this last case the two rings 15 can be substituted.
  • the axial displacement of the cylindrical body 10 can be controlled for examples by the rollers 30 that act on the ring 15.
  • the axial displacement of the cylindrical body 10 can be controlled by the ribs 31 that engage the side walls 32 of the ring 15.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Crushing And Grinding (AREA)
  • Polishing Bodies And Polishing Tools (AREA)
EP99125366A 1999-01-27 1999-12-20 Device for grinding ceramic materials and apparatus comprising the device Withdrawn EP1023969A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ITMI990143 IT1307932B1 (it) 1999-01-27 1999-01-27 Dispositivo per la macinazione di materiali ceramici e impiantocomprendente il dispositivo.
ITMI990143 1999-01-27

Publications (1)

Publication Number Publication Date
EP1023969A1 true EP1023969A1 (en) 2000-08-02

Family

ID=11381628

Family Applications (1)

Application Number Title Priority Date Filing Date
EP99125366A Withdrawn EP1023969A1 (en) 1999-01-27 1999-12-20 Device for grinding ceramic materials and apparatus comprising the device

Country Status (3)

Country Link
EP (1) EP1023969A1 (it)
BR (1) BR0000176A (it)
IT (1) IT1307932B1 (it)

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2210584A (en) * 1939-04-07 1940-08-06 Owens Illinois Glass Co Apparatus for polishing and cleaning plastic articles
US2875894A (en) * 1956-05-25 1959-03-03 United States Steel Corp Nail machine whisker separator
JPS5554171A (en) * 1978-10-07 1980-04-21 Akio Yamada Method and device for making garden stone
US5029415A (en) * 1990-04-05 1991-07-09 T I P O M Apparatus for centrifugal hydromechanical cleaning and polishing
EP0714703A1 (en) * 1994-11-30 1996-06-05 Skega Ab A grinding process and a drum lining
US5586925A (en) * 1994-04-08 1996-12-24 Donato DiNorcia Apparatus and method for processing marble

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2210584A (en) * 1939-04-07 1940-08-06 Owens Illinois Glass Co Apparatus for polishing and cleaning plastic articles
US2875894A (en) * 1956-05-25 1959-03-03 United States Steel Corp Nail machine whisker separator
JPS5554171A (en) * 1978-10-07 1980-04-21 Akio Yamada Method and device for making garden stone
US5029415A (en) * 1990-04-05 1991-07-09 T I P O M Apparatus for centrifugal hydromechanical cleaning and polishing
US5586925A (en) * 1994-04-08 1996-12-24 Donato DiNorcia Apparatus and method for processing marble
EP0714703A1 (en) * 1994-11-30 1996-06-05 Skega Ab A grinding process and a drum lining

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 004, no. 096 (M - 020) 11 July 1980 (1980-07-11) *

Also Published As

Publication number Publication date
BR0000176A (pt) 2000-10-24
ITMI990143A1 (it) 2000-07-27
IT1307932B1 (it) 2001-11-29

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