EP1261431B1 - Apparatus for grinding of particulate material - Google Patents

Apparatus for grinding of particulate material Download PDF

Info

Publication number
EP1261431B1
EP1261431B1 EP01900219A EP01900219A EP1261431B1 EP 1261431 B1 EP1261431 B1 EP 1261431B1 EP 01900219 A EP01900219 A EP 01900219A EP 01900219 A EP01900219 A EP 01900219A EP 1261431 B1 EP1261431 B1 EP 1261431B1
Authority
EP
European Patent Office
Prior art keywords
shaft
cross
downwardly
grinding
feed shaft
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.)
Expired - Lifetime
Application number
EP01900219A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP1261431A1 (en
Inventor
Jörn TOUBORG
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.)
FLSmidth and Co AS
Original Assignee
FLSmidth and Co AS
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 FLSmidth and Co AS filed Critical FLSmidth and Co AS
Publication of EP1261431A1 publication Critical patent/EP1261431A1/en
Application granted granted Critical
Publication of EP1261431B1 publication Critical patent/EP1261431B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • B02C4/00—Crushing or disintegrating by roller mills
    • B02C4/28—Details
    • B02C4/286—Feeding devices

Definitions

  • the present invention relates to an apparatus for grinding of particulate material such as cement raw materials, cement clinker or similar materials, in a roller mill, such as a roller press, ring-roller mill, vertical mill or a similar unit.
  • the shaft being of substantially vertical configuration and with a downwardly reduced cross-section.
  • An apparatus of the aforementioned kind is prior art as for example disclosed in GB 963088 A .
  • Such operating problems may be ascribable to many different causes.
  • On explanation could be the difficulty of achieving an acceleration of the material shich is to be ground in the roller press to an extent which corresponds to the peripheral velocity of the rollers.
  • Such acceleration of the material is usually achieved by means of the rollers by physical contact with the latter and/or through the action of gravity.
  • the capability of the rollers is restricted to a very short range of operation, thereby severly limiting the rate of acceleration, and in a shaft the force of gravity will either be counteracted by the friction of the material against the shaft and/or the friction present in the material itself.
  • acceleration accomplished in a traditional shaft will also entail significant admixture of air, which is undesirable, and this will also adversely affect the grinding process.
  • the described configuration of the feed shaft has, surprisingly, proved that the material over a given height of fall may attain high velocities, and that this is feasible without involving admixture of air into the material. It has thus been established that it will be possible for the material to attain velocities which are close to the velocity achievable in connection with the free fall of individual particles.
  • the material can be accelerated to a velocity of more than 1.5 m/s. However, it is preferred that the material be accelerated to a velocity of more than 5 m/s, and preferably of more than 10 m/s.
  • An example of the cross-sectional characteristics according to the invention is known from the form of a free-falling water jet, for example from a slow-running water tap.
  • a free-falling water jet for example from a slow-running water tap.
  • the water flow rate is quite small, with the width of the water jet corresponding roughly to the outlet.
  • the force of gravity has increased the water flow rate, but since the water flow throughout the jet is the same, and since the density throughout the jet is also the same, this means that the cross-section of the water jet is smaller.
  • the circumference is proportional not to the height of fall but to the height of fall to power ⁇ 1 ⁇ 4.
  • the shaft be configured so that its cross-sectional area as a function of the fall of height is essentially as defined in the formula above.
  • the correction element ⁇ must be within the range 0 and 0.2, preferably lower than 0.1.
  • the shaft may, for example, be made up of a number of pyramidal or conical sections so that the reduction of the cross-sectional circumference of the shaft exhibits a gradual, downwardly decreasing trend.
  • the number of sections incorporated is at least 3, but preferably at least 5, and most preferably at least 10.
  • the reduction of the cross-sectional circumference of the shaft exhibits a continuous downwardly decrease, and that for example the shaft is of a trumpet-shaped configuration.
  • the shaft according to the invention for conveying any particulate material from one level to a lower level by the action of gravity, and for this purpose the shaft should be of a substantially vertical configuration, with a downwardly reduced cross-section where the reduction of the cross-sectional circumference of the shaft is downwardly decreasing.
  • Fig. 1 shows a roller press installation comprising a feed shaft according to the invention.
  • Fig. 1 a roller press installation comprising a roller press 1 with two oppositely rotating rollers 3 and 5.
  • the material to be ground is fed from a bin 7 via a feed conveyor 9 and a feed shaft 11 to a grinding zone 13 between the rollers 3 and 5.
  • the depicted shaft is formed with a downwardly reduced cross-section in such a way that the reduction of the shafts cross-sectional circumference per height unit is also downwardly decreasing.
  • the shaft is formed with a downwardly decreasing cross-section which is inversely proportional to the steadily downwardly increasing velocity of the material due to the gravity-induced acceleration.
  • the applicant filing the present patent application has conducted tests with a shaft configured in accordance with the aforementioned guidelines, with a final cross section of 0.1 x 0.1 metres and a height of 5 metres, and has recorded a material velocity which is close to 10 m/s without air admixture.

Landscapes

  • Engineering & Computer Science (AREA)
  • Food Science & Technology (AREA)
  • Crushing And Grinding (AREA)
  • Disintegrating Or Milling (AREA)
  • Finish Polishing, Edge Sharpening, And Grinding By Specific Grinding Devices (AREA)
  • Control And Other Processes For Unpacking Of Materials (AREA)
EP01900219A 2000-01-28 2001-01-19 Apparatus for grinding of particulate material Expired - Lifetime EP1261431B1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DKPA200000147 2000-01-28
DK200000147 2000-01-28
PCT/IB2001/000057 WO2001054818A1 (en) 2000-01-28 2001-01-19 Method and apparatus for grinding of particulate material

Publications (2)

Publication Number Publication Date
EP1261431A1 EP1261431A1 (en) 2002-12-04
EP1261431B1 true EP1261431B1 (en) 2008-06-04

Family

ID=8159040

Family Applications (1)

Application Number Title Priority Date Filing Date
EP01900219A Expired - Lifetime EP1261431B1 (en) 2000-01-28 2001-01-19 Apparatus for grinding of particulate material

Country Status (19)

Country Link
EP (1) EP1261431B1 (cs)
JP (1) JP2003520676A (cs)
KR (1) KR100729026B1 (cs)
CN (1) CN1139431C (cs)
AT (1) ATE397493T1 (cs)
AU (1) AU771192B2 (cs)
BR (1) BR0107809A (cs)
CA (1) CA2397796C (cs)
CZ (1) CZ299850B6 (cs)
DE (1) DE60134307D1 (cs)
DK (1) DK1261431T3 (cs)
ES (1) ES2307582T3 (cs)
MX (1) MXPA02007282A (cs)
PL (1) PL196219B1 (cs)
PT (1) PT1261431E (cs)
RU (1) RU2253512C2 (cs)
TW (1) TW466136B (cs)
WO (1) WO2001054818A1 (cs)
ZA (1) ZA200204389B (cs)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN118929132B (zh) * 2023-05-12 2025-11-07 中冶长天国际工程有限责任公司 一种溜槽防堵清洁装置及刮刀位置确定方法

Family Cites Families (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE621430A (cs) * 1961-08-26
ZA741753B (en) * 1974-03-18 1975-10-29 De Beers Ind Diamond Rolls crushers
CH624313A5 (cs) * 1977-06-24 1981-07-31 Buehler Ag Geb
US4396158A (en) * 1981-05-28 1983-08-02 Olsen Jerome A Device and method for processing hatchery offal
DE3525935A1 (de) * 1985-07-19 1987-01-29 Krupp Polysius Ag Verfahren und anlage zur zerkleinerung von mahlgut
JPS6320045A (ja) * 1986-07-11 1988-01-27 宇部興産株式会社 粉砕装置
FR2620635B1 (fr) * 1987-09-17 1992-09-11 Fives Cail Babcock Procede de broyage fin de mineraux et broyeur pour la mise en oeuvre de ce procede
JPH01110838U (cs) * 1988-01-20 1989-07-26
DE4126899A1 (de) * 1991-08-14 1993-02-18 Krupp Polysius Ag Verfahren und anlage zum zerkleinern von sproedem mahlgut
DK205591A (da) * 1991-12-23 1993-06-24 Smidth & Co As F L Fremgangsmaade til formaling af partikelformet materiale i en valsepresse, samt indretning til udoevelse af fremgangsmaaden
JPH06285854A (ja) * 1993-03-31 1994-10-11 Hisao Sato 発泡スチロール処理装置
JP3103600B2 (ja) * 1995-06-13 2000-10-30 エイチ． スターナー、マーク 脱水エンドウ豆スープを調製する方法及び装置
AU771345B2 (en) * 1998-12-08 2004-03-18 Emerson Electric Co. Coriolis mass flow controller
RU2207907C2 (ru) * 2001-08-20 2003-07-10 Акционерная компания "АЛРОСА" (Закрытое акционерное общество) Валковый пресс для измельчения минерального сырья

Also Published As

Publication number Publication date
AU771192B2 (en) 2004-03-18
MXPA02007282A (es) 2003-02-12
CN1400924A (zh) 2003-03-05
PL356139A1 (en) 2004-06-14
CZ299850B6 (cs) 2008-12-10
CN1139431C (zh) 2004-02-25
BR0107809A (pt) 2002-10-22
PL196219B1 (pl) 2007-12-31
RU2002123056A (ru) 2004-03-10
KR100729026B1 (ko) 2007-06-14
DE60134307D1 (de) 2008-07-17
EP1261431A1 (en) 2002-12-04
CA2397796C (en) 2009-01-13
ATE397493T1 (de) 2008-06-15
ES2307582T3 (es) 2008-12-01
AU2391501A (en) 2001-08-07
CA2397796A1 (en) 2001-08-02
TW466136B (en) 2001-12-01
JP2003520676A (ja) 2003-07-08
RU2253512C2 (ru) 2005-06-10
CZ20022579A3 (cs) 2003-01-15
KR20020062776A (ko) 2002-07-29
ZA200204389B (en) 2003-08-27
DK1261431T3 (da) 2008-07-21
PT1261431E (pt) 2008-09-08
WO2001054818A1 (en) 2001-08-02

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