EP0688604B1 - Improved pan mill for clay or aggregates in general - Google Patents

Improved pan mill for clay or aggregates in general Download PDF

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Publication number
EP0688604B1
EP0688604B1 EP95109470A EP95109470A EP0688604B1 EP 0688604 B1 EP0688604 B1 EP 0688604B1 EP 95109470 A EP95109470 A EP 95109470A EP 95109470 A EP95109470 A EP 95109470A EP 0688604 B1 EP0688604 B1 EP 0688604B1
Authority
EP
European Patent Office
Prior art keywords
grinding
grinding wheels
pair
shaft
clay
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.)
Revoked
Application number
EP95109470A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0688604A1 (en
Inventor
Guglielmo Bedeschi
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.)
BEDESCHI SpA
Original Assignee
BEDESCHI SpA
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Publication date
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Application filed by BEDESCHI SpA filed Critical BEDESCHI SpA
Publication of EP0688604A1 publication Critical patent/EP0688604A1/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
    • B02C15/00—Disintegrating by milling members in the form of rollers or balls co-operating with rings or discs
    • B02C15/14—Edge runners, e.g. Chile mills

Definitions

  • the present invention relates to an improved pan mill for clay or aggregates in general.
  • clay as well as other kinds of aggregates, must be ground and mixed before being processed (for example mixed, fired, etcetera).
  • Clay can be ground by means of machines with cylindrical rollers.
  • the clay is processed beforehand in machines commonly termed pan mills before being ground in the roller mill.
  • Pan mills therefore perform a first crushing of the aggregate, which can then be sent to finer grinding in the roller mill.
  • FIGS. 1 and 2 are schematic views of the essential structure of known commercially available pan mills.
  • a pan mill is substantially constituted by a supporting structure A including posts B that are anchored to the ground.
  • a substantially circular grinding surface C is fixed to the supporting structure A.
  • Said grinding wheels D and E are freely rotatable about their respective axis F and G.
  • Each one of the respective axes F and G is connected, by means of a corresponding oscillating arm H, to a vertical axis I that is rotatably coupled in a central region of the grinding surface C.
  • a gearmotor L is fixed on a frame M that surmounts the grinding surface C and turns the vertical axis I, which in turn rotates the grinding wheels D and E, which by friction on the grinding surface C also rotate about their own axis F and G.
  • the material to be ground is loaded continuously on one side of the grinding surface C by means of a belt N and is distributed over the entire grinding surface C by means of scrapers O.
  • pan mill that is more advanced than the one here described is commercially available but does not introduce substantial modifications to the essential structure.
  • pan mill Although this type of pan mill has improved and increased the production of ground material, it has not been able to solve the basic drawbacks that will be described hereinafter.
  • the grinding wheels In view of this centrifugal force, the grinding wheels must be turned at extremely low speeds (generally 13 to 16 rpm) to avoid creating excessive imbalances in the machine structure.
  • a principal aim of the present invention is to provide a pan mill that does not have the drawbacks affecting known types.
  • an object of the present invention is to provide a pan mill in which the installed power and used power ratio, in proportion to the amount of production, is lower than in known types.
  • Another object of the present invention is to provide a pan mill the hourly production whereof can be compared, and is competitive, with that of other functionally equivalent machines.
  • an improved pan mill for clay or aggregates in general which comprises, on a supporting structure, a substantially circular grinding surface in the center of which a shaft is rotatably coupled, said shaft having a substantially vertical rotation axis, grinding wheels being placed on said surface and being rigidly coupled so as to cover a revolving path with respect to said shaft, said grinding wheels rotating about respective substantially horizontal half-shafts that are always connected to said shaft along corresponding oscillating arms, means for removing the ground aggregate, and means for feeding the aggregate to be ground, characterized in that it comprises at least two pairs of said grinding wheels, each pair being constituted by two mutually identical grinding wheels that are arranged symmetrically with respect to said shaft, at least one of said at least two pairs having an inner grinding path and at least one having an outer crushing path so as to cover areas of said grinding surface that are substantially annular and partially interfere with each other.
  • pan mill for clay or aggregates in general, according to the invention is generally designated by the reference numeral 10.
  • the pan mill 10 comprises a supporting structure 11 constituted by four posts 12 surmounted by four cross-members 13, which are arranged so as to substantially form a square.
  • a substantially circular grinding surface 14 is arranged on the cross-members 13 and has a raised perimetric rim forming a wall 14a.
  • a shaft 15 having a substantially vertical rotation axis is supported and rotatably coupled substantially at the center of the grinding surface 14.
  • the shaft 15 is connected, by means of a universal joint not shown in the figures, to a gearmotor 16 arranged inside the supporting structure 11 and substantially fixed to the ground.
  • the grinding wheels 17 to 20 are all identical as regards both their shape and their weight; they all furthermore rotate freely about their own half-shaft 21, which has a substantially horizontal longitudinal axis.
  • the grinding wheels 17 to 20 are arranged so as to form pairs that are mutually offset by substantially 90 sexagesimal degrees with respect to the revolving path about the shaft 15; each one of said pairs is constituted by two grinding wheels 17 and 18 and 19 and 20 arranged mutually symmetrically with respect to the shaft 15.
  • each one of the half-shafts 21 of the pair of grinding wheels 17 and 18 is connected to a corresponding oscillating arm 22, which is in turn pivoted so as to form a hinge-like connection to a pivot 23 rigidly coupled to the shaft 15.
  • the respective half-shafts 21 of the pair of grinding wheels 19 and 20 are connected to corresponding oscillating arms 24 pivoted directly to the shaft 15.
  • the pair of grinding wheels 17 and 18 provides a revolving path having a greater radius than the one related to the pair of grinding wheels 19 and 20; in this sense, the pair of grinding wheels 17 and 18 is described as outer pair, whereas the pair of grinding wheels 19 and 20 is described as inner pair.
  • outer pair of grinding wheels 17 and 18 rotates on a track 25 formed by perforated grilles, whereas the inner pair of grinding wheels 19 and 20 rotates on a solid track 26.
  • Two scrapers 27 are furthermore rigidly coupled to the motion of the grinding wheels 17 to 20 and are arranged symmetrically with respect to the shaft 15.
  • a conical hopper 28 for feeding the pair of inner grinding wheels 19 and 20 is arranged above the grinding wheels 17 to 20 in a position that is substantially central with respect to the grinding surface 14.
  • the hopper 28 distributes the material to be ground in a region covered by the inner pair of grinding wheels 19 and 20, which performs a first grinding of the aggregate.
  • the motion of the grinding wheels 19 and 20 and the combined action of the scrapers 27 carries the aggregate, which at this point is already partially ground, in the region covered by the pair of grinding wheels 17 and 18, which further crushes the aggregate at the grilled track 25.
  • pan mill according to the invention is perfectly balanced with respect to centrifugal forces, since the resultant is cancelled by the particular arrangement of the grinding wheels.
  • pan mill with four grinding wheels is approximately double, even if one considers only the grinding and crushing action; this production amount increases further if one considers that said overall balance of the pan mill allows significantly higher rotation rates than those of commercially available pan mills.
  • the materials employed may be any according to the requirements.

Landscapes

  • Engineering & Computer Science (AREA)
  • Food Science & Technology (AREA)
  • Crushing And Grinding (AREA)
  • Preparation Of Clay, And Manufacture Of Mixtures Containing Clay Or Cement (AREA)
  • Cookers (AREA)
  • Curing Cements, Concrete, And Artificial Stone (AREA)
  • Silicates, Zeolites, And Molecular Sieves (AREA)
EP95109470A 1994-06-22 1995-06-19 Improved pan mill for clay or aggregates in general Revoked EP0688604B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT94PD000115A ITPD940115A1 (it) 1994-06-22 1994-06-22 Molazza perfezionata per argilla o inerti in genere
ITPD940115 1994-06-22

Publications (2)

Publication Number Publication Date
EP0688604A1 EP0688604A1 (en) 1995-12-27
EP0688604B1 true EP0688604B1 (en) 1998-09-16

Family

ID=11390735

Family Applications (1)

Application Number Title Priority Date Filing Date
EP95109470A Revoked EP0688604B1 (en) 1994-06-22 1995-06-19 Improved pan mill for clay or aggregates in general

Country Status (6)

Country Link
EP (1) EP0688604B1 (it)
AT (1) ATE171085T1 (it)
DE (1) DE69504763T2 (it)
DK (1) DK0688604T3 (it)
ES (1) ES2124466T3 (it)
IT (1) ITPD940115A1 (it)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105435908A (zh) * 2014-09-22 2016-03-30 川崎重工业株式会社 立式辊碾机
CN106513114A (zh) * 2016-12-26 2017-03-22 郑州游爱网络技术有限公司 一种能够称重的中药研磨装置

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101987303A (zh) * 2009-08-07 2011-03-23 上海建设路桥机械设备有限公司 双齿辊式粘土破碎机
CN103752375A (zh) * 2014-01-24 2014-04-30 宁现林 一种双辊石碾
CN106179624A (zh) * 2014-12-05 2016-12-07 成都宸鸿科技有限公司 一种用于切磨机的转摆臂
CN106179621A (zh) * 2014-12-05 2016-12-07 成都宸鸿科技有限公司 一种用于切磨机的转摆臂
CN106638076A (zh) * 2016-12-08 2017-05-10 中国宣纸股份有限公司 宣纸原料的碾料装置
CN109465071B (zh) * 2019-01-16 2020-12-18 王微静 一种谷物磨粉机
CN110369088B (zh) * 2019-06-14 2021-05-04 安吉县宇宏粘土化工有限公司 自动化膨润土加工方法

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE137970C (it) *
GB191221069A (en) * 1912-09-16 1913-09-16 Robert Rodger Improvements in Mills or Apparatus for Reducing Ore or other Material.
DE698349C (de) * 1937-11-30 1940-11-08 Carl Weisshuhn & Soehne Kollergang
US2475814A (en) * 1944-08-25 1949-07-12 Bruchsaler Karl Edge runner mill
JPS5821531Y2 (ja) * 1979-09-01 1983-05-07 太洋鋳機株式会社 混練装置
DE9017356U1 (de) * 1990-12-22 1991-03-21 Rieter-Werke Händle KG, 78467 Konstanz Kollergang, insbesondere zur kontinuierlichen trockenen oder nassen Aufbereitung von mineralischem Gut

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105435908A (zh) * 2014-09-22 2016-03-30 川崎重工业株式会社 立式辊碾机
CN105435908B (zh) * 2014-09-22 2018-06-22 川崎重工业株式会社 立式辊碾机和旋转台
CN106513114A (zh) * 2016-12-26 2017-03-22 郑州游爱网络技术有限公司 一种能够称重的中药研磨装置

Also Published As

Publication number Publication date
ITPD940115A0 (it) 1994-06-22
DE69504763D1 (de) 1998-10-22
EP0688604A1 (en) 1995-12-27
DE69504763T2 (de) 1999-02-04
DK0688604T3 (da) 1999-06-14
ITPD940115A1 (it) 1995-12-22
ATE171085T1 (de) 1998-10-15
ES2124466T3 (es) 1999-02-01

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