EP1292394A1 - Tubular rotary mill liner - Google Patents
Tubular rotary mill linerInfo
- Publication number
- EP1292394A1 EP1292394A1 EP01947375A EP01947375A EP1292394A1 EP 1292394 A1 EP1292394 A1 EP 1292394A1 EP 01947375 A EP01947375 A EP 01947375A EP 01947375 A EP01947375 A EP 01947375A EP 1292394 A1 EP1292394 A1 EP 1292394A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- fin
- mill
- deflectors
- base
- shielding
- 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.)
- Granted
Links
- 239000000463 material Substances 0.000 claims description 18
- 238000005266 casting Methods 0.000 claims description 6
- 230000000295 complement effect Effects 0.000 claims description 5
- 239000002131 composite material Substances 0.000 claims description 5
- 238000005299 abrasion Methods 0.000 claims description 2
- 230000001154 acute effect Effects 0.000 claims description 2
- 239000000919 ceramic Substances 0.000 claims 1
- 238000000227 grinding Methods 0.000 description 38
- 230000007423 decrease Effects 0.000 description 8
- 230000000694 effects Effects 0.000 description 6
- 238000000034 method Methods 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- 229910001018 Cast iron Inorganic materials 0.000 description 1
- 229910001208 Crucible steel Inorganic materials 0.000 description 1
- 235000019738 Limestone Nutrition 0.000 description 1
- 238000009825 accumulation Methods 0.000 description 1
- 239000011324 bead Substances 0.000 description 1
- 239000004568 cement Substances 0.000 description 1
- 238000005119 centrifugation Methods 0.000 description 1
- 229910010293 ceramic material Inorganic materials 0.000 description 1
- 239000003245 coal Substances 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 239000006028 limestone Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000005192 partition Methods 0.000 description 1
- 230000035515 penetration Effects 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- UONOETXJSWQNOL-UHFFFAOYSA-N tungsten carbide Chemical compound [W+]#[C-] UONOETXJSWQNOL-UHFFFAOYSA-N 0.000 description 1
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
Definitions
- the present invention relates to a shield for a rotary tubular grinder comprising a cylindrical shell intended to contain material to be ground and a load of crushing machines, in which the shield consists of rings of individual armor plates juxtaposed.
- the invention relates more particularly to grinders used for grinding cement (clinker) in the dry process, coal, limestone and ores in the dry or wet process.
- crushers consist of a metallic cylindrical shell rotating around its longitudinal axis and containing a crushing charge consisting of crushing machines, generally balls, but which can also consist of cylpebs, boulpebs, etc., of variable dimensions.
- the material to be ground is introduced on one side of the grinder and, as it progresses towards the outlet, on the opposite side, it is crushed and ground between the grinding machines.
- a conventional mill is generally divided, in the axial direction, by means of a diametrical partition dividing into two successive chambers.
- the first chamber in which the coarse crushing of the material is carried out contains grinding balls generally having a diameter of between 60 mm and 90 mm.
- the second chamber, in which the fine grinding takes place, contains grinding balls with a diameter generally between 15 mm and 60 mm.
- single-mill mills single chambers which contain crushing machines of different diameters and in different quantities depending on the diameter.
- These shields are, moreover, very sensitive to grains, that is to say when there is a certain accumulation of very hard grains (about 6 to 12 mm) in the areas where there are small grinding machines, the classification is very disturbed, up to the reverse classification, that is to say the return of small devices towards the entry and large devices towards the exit.
- the plates have corrugations which can be inclined at an angle of 15 to 30 ° relative to the generator of the mill.
- the purpose of the inclination of these undulations is to create a screw effect to act on the grinding load and the material to be ground. Indeed, when the crusher rotates, the large grinding machines are generally found, in majority, at the periphery of the grinding load and the aim of the inclination of the corrugations is to push these grinding machines by effect of screws towards the entry of the grinding chamber.
- the classification sought in this way is however very difficult and often random.
- the plates are also relatively heavy and the classification effect decreases as the wear on the corrugations increases.
- the object of the present invention is to provide a new shield for a tubular crusher which makes it possible to eliminate or, at least, to reduce the drawbacks of conventional shields, more precisely a crusher with a lighter shield which makes it possible to create a good classification , which is effective and very flexible to use.
- the present invention provides a tubular crusher of the kind described in the preamble which is characterized in that a certain number of shielding plates located at selected locations are formed in the form of deflectors comprising a raised field fin. on a base plate fixed to the shell and forming an angle of less than 25 ° with respect to a diametrical plane of the mill.
- the lateral side of the fin located on the front side, seen in the direction of rotation of the mill, is preferably beveled, this beveling being provided on the face facing the inlet of the mill.
- This bevelled lateral side of the fin is, relative to the direction of advancement of the material, recessed relative to the opposite lateral side.
- This inclination of the fins which is preferably greater than 5 °, thus creates a propeller effect which promotes the progression of the material and contributes to the classification of grinding machines.
- the fin can form an integral part of the base plate and be made together with it by casting.
- the fin can also be a separate piece, integral with a base provided with a hole so that it can be fixed to the shell of the mill.
- This base may have a frustoconical periphery which can penetrate an opening of complementary shape of a base plate.
- FIG. 1 is a schematic plan view of a first embodiment of a deflector according to the present invention
- - Figure 2 is a side view of the same deflector seen along arrow II in Figure 1;
- FIG. 7 shows schematically a plan view of a second embodiment of a deflector
- FIG. 8 shows a cross section along the section plane VIII-VIII in Figure 7;
- FIG. 9 shows a side view of a fin with its base
- FIG. 10 shows a plan view of a filling part
- FIG. 11 shows a cross-sectional view through the part of Figure 10
- FIGS. 1 and 2 are formed in the form of deflectors 20 as shown in FIGS. 1 and 2 of which FIG. 1 is a view from above on a deflector 20 while FIG. 2 is a side view in the direction of arrow II on the Figure 1 which also shows the direction of rotation of the mill.
- Each deflector comprises a base plate 22 provided with a central hole 24 to be fixed on the interior wall of the shell of the mill.
- a fin 26 which is erected on the plate 22, preferably perpendicular thereto.
- This fin 26 can have a thickness of between
- each fin 25 and 50 mm and a height (radial with respect to the mill) preferably between 100 and 350 mm. According to an important characteristic of the invention, each fin
- the lateral side of the fin 26 which is on the front side, seen in the
- FIGS. 1 and 2 on the face of the fin 26 which is turned towards the inlet of the mill in order to form a more or less acute edge 28.
- This edge 28 facilitates penetration in the load and contributes to a continuous lifting, that is to say prevents the projection of grinding objects on the shielding.
- the fins 26 will generally be made of very hard cast iron or steel if the working conditions of the grinding are harsher, for example when using grinding balls 90 mm in diameter.
- the working face of these deflectors that is to say the face facing the outlet of the mill (to the right in Figure 1), as well as the edge 28 can be made more resistant to abrasion wear by using "padding" (ie a mixture of metal and ceramic material). These areas can also be protected by weld beads made of very hard tungsten carbide for example.
- Figures 3, 4 and 5 each show a part of the shell of the grinder in development and with different examples of placement configuration of the deflectors.
- the arrow R denotes the direction of rotation of the mill while the arrow D denotes the direction of movement of the material to be ground.
- the plates designated by A are conventional normal plates, while the plates designated by B are plates designed in accordance with the present invention as deflectors.
- each deflector B is adjacent to another deflector B at the two diametrically opposite corners to thereby define a complete or partial spiral over the entire turn inside the shell.
- FIG. 4 shows a configuration similar to that of FIG. 3 with the difference that between a deflector B and two neighboring deflectors of the same spiral is a longitudinal row of plates A without deflectors.
- Figure 5 shows an example of configuration similar to that of Figure 4, but here each deflector B is separated from the neighboring deflectors of the same spiral by a diametrical row of plate without deflectors. Note that, in this configuration, the axial spacing between two neighboring deflectors is greater than in the configurations in FIGS. 3 and 4.
- the number of deflectors can vary between 5% and 15% of the total number of shielding plates.
- Figure 6 shows the complete development of a shell of a shredder 4 meters in diameter and 10 meters long.
- the deflectors are arranged in a spiral in the grinder according to the configuration of FIG. 3.
- the largest grinding machines therefore travel faster than the smallest grinding machines on the base of the grinding load, that is to say from the rear of the grinder towards its entry.
- This method of classifying grinding bodies is very effective. It also has another great advantage that the degree of filling increases from the inlet to the outlet. We know, in fact, that the best grinding yield is obtained when the voids between the grinding bodies (more or less 41%) are filled with material and that the material to be ground, by advancing in the grinder, "swells" (c that is, its bulk density decreases). It is therefore advantageous to have a higher degree of filling at the outlet of the mill to optimize the grinding yield. Another advantage is that the material to be ground is pushed faster through the crusher and there is, thanks to these deflectors, better mixing between the grinding machines and the material to be ground.
- the deflector shown in Figures 1 and 2 is a single piece produced by casting. We will describe below, with reference to the following figures, an embodiment with a composite deflector.
- This composite deflector generally designated by the reference 30 in FIG. 7, comprises a fin 36 comparable to the fin 26 of FIGS. 1 and 2 but provided, at its base, with a base 34 which, in the embodiment shown , has a square shape.
- the base 34 and the fin 36 form a single piece which can be produced by casting but separate from the base plate 32.
- This base plate has an opening 40 of shape complementary to that of the base 34 and forming a frame for receiving it. this.
- the base 34 and the opening 40 of the base plate 32 have complementary frustoconical sections, so that when the base 34 is disposed in its housing of the base plate 32 and is fixed, through its fixing hole 38, to the shell of the mill, the base plate 32 is held in place by the base 34 and no longer needs to be fixed to the shell.
- These filling pieces 42 have exactly the same shape and the same section as the bases 34 shown in FIGS. 7 to 9 but do not have fins 36.
- These parts make it possible to fill the openings 40 in the base plates 32 when it is desired to remove, as desired, certain deflectors 30 shown in FIGS. 7 to 9. It suffices, in fact, to unbolt the base 34, to remove it with its fin 36, to reseal the opening with the filling part 42 and to bolt the latter to the ferrule through its central opening 44.
- the fins 26 and 36 shown in the different figures are suitable, because of their bevelled edge 28, only for a grinder rotating in the direction indicated in Figures 1 and 3 to 5. In a grinder rotating in the opposite direction, it is necessary provide deflectors which are symmetrical with respect to those shown in the figures.
- the number of deflectors is greater when the speed expressed as a percentage of the critical speed is low.
- the critical speed is the speed of rotation of the mill at which centrifugation occurs and
- Standard base plates generally have an average thickness of ⁇ 40 mm, i.e. a DIN standard plate (314.16 x 250 mm) has a weight of the order of 24 kg.
- a DIN standard plate 314.16 x 250 mm
- the assembly of a fin and a base weighs a maximum of 25 kg. Consequently, from the point of view of ergonomics and safety when mounting the shielding, the proposed deflectors do not constitute a handicap.
- the invention also has the advantage of allowing a fairly significant gain in weight of the shielding per m 2 .
- - surface to be shielded 150.8 m 2 ;
- the weight per m 2 would be 366 kg corresponding to a total weight of ⁇ 55,200 kg, ie a decrease of around 20%.
- a 4.8 meter diameter grinder on
- the power absorbed with the standard classification shielding for the second chamber is of the order of 3.256 KWh;
- FIGS. 12 and 13 show a part of the shell of the mill, in development with an embodiment in which the deflectors of the plates B are oriented in the opposite direction to the embodiment of the previous figures. If the fins are always inclined at an angle of between 5 ° and 25 ° relative to a diametrical plane, this inclination is, according to FIGS. 12 and 13, in the direction of the outlet of the mill, that is to say say that the lateral side of attack, seen in the direction of rotation, which is also the beveled side, is this time closer to the outlet of the mill than the opposite side.
- the deflectors are, moreover, bevelled on the face of the fin which is turned towards the outlet of the mill and not on the opposite face as in the embodiment of the preceding figures.
- the mutual arrangement of the different deflectors B is however always carried out with the aim of obtaining a configuration in the form of a spiral, the inclination of which may however vary as shown by the comparison between FIGS. 12 and 13.
- the spiral is less stiff than in that of FIG. 12.
- the deflectors B are associated in pairs in the successive adjacent rings.
- the fins of the two adjacent deflectors B of the same ring are arranged, one on the inlet side of the deflector and the other on the outlet side of the deflector.
- the deflectors of FIGS. 12 and 13 can be either one-piece castings as illustrated in FIGS. 1 and 2, or composite parts according to FIGS. 7 to 11.
- the working face of the fins in the Figures 12 and 13 (which this time is the side facing the entrance of the mill) can be worked or include inlays to increase its resistance.
Landscapes
- Engineering & Computer Science (AREA)
- Food Science & Technology (AREA)
- Crushing And Grinding (AREA)
- Milling Processes (AREA)
- Disintegrating Or Milling (AREA)
- Treatment Of Fiber Materials (AREA)
- Crushing And Pulverization Processes (AREA)
Abstract
Description
Claims
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP01947375A EP1292394B1 (en) | 2000-06-23 | 2001-06-14 | Tubular rotary mill liner |
Applications Claiming Priority (6)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP00202178 | 2000-06-23 | ||
EP00202178A EP1166876A1 (en) | 2000-06-23 | 2000-06-23 | Lining for a rotary tubular mill |
LU90653 | 2000-10-18 | ||
LU90653 | 2000-10-18 | ||
PCT/EP2001/006867 WO2001097975A1 (en) | 2000-06-23 | 2001-06-14 | Tubular rotary mill liner |
EP01947375A EP1292394B1 (en) | 2000-06-23 | 2001-06-14 | Tubular rotary mill liner |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1292394A1 true EP1292394A1 (en) | 2003-03-19 |
EP1292394B1 EP1292394B1 (en) | 2008-09-03 |
Family
ID=26072398
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP01947375A Expired - Lifetime EP1292394B1 (en) | 2000-06-23 | 2001-06-14 | Tubular rotary mill liner |
Country Status (18)
Country | Link |
---|---|
US (1) | US6951315B2 (en) |
EP (1) | EP1292394B1 (en) |
JP (1) | JP2003535690A (en) |
KR (1) | KR100754645B1 (en) |
CN (1) | CN1305575C (en) |
AT (1) | ATE406958T1 (en) |
AU (2) | AU6907901A (en) |
BR (1) | BR0111794B1 (en) |
CA (1) | CA2413342A1 (en) |
CZ (1) | CZ298084B6 (en) |
DE (1) | DE60135651D1 (en) |
ES (1) | ES2312452T3 (en) |
HU (1) | HU228663B1 (en) |
MX (1) | MXPA02012720A (en) |
PL (1) | PL198458B1 (en) |
PT (1) | PT1292394E (en) |
RU (1) | RU2266789C2 (en) |
WO (1) | WO2001097975A1 (en) |
Families Citing this family (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2895286B1 (en) * | 2005-12-23 | 2008-05-09 | Solvay | MILLING PROCESS |
KR101035336B1 (en) * | 2008-04-28 | 2011-05-20 | 주식회사 비엠지코리아 | Duct for roaster |
CN105772172A (en) * | 2014-12-22 | 2016-07-20 | 佛山市宝航机械装备行业知识产权服务有限公司 | Efficient ball mill capable of achieving even grinding |
US10370129B2 (en) | 2015-08-17 | 2019-08-06 | Dash Llc | Assemblies including plug devices, and related plug devices and methods |
EP3932559B1 (en) * | 2020-06-29 | 2024-02-21 | Metso Finland Oy | Hydraulic crusher concave retaining system |
Family Cites Families (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE833892C (en) | 1947-11-18 | 1952-03-13 | Fischer Ag Georg | Armored plate lining for tubular mills |
US4211370A (en) * | 1978-11-24 | 1980-07-08 | Midland-Ross Corporation | Lining for grinding mills |
SE433930B (en) * | 1981-06-18 | 1984-06-25 | Rigello Pak Ab | CABINET OR CARTON OPERATING DEVICE |
US4515319A (en) * | 1982-07-08 | 1985-05-07 | Wei Yun Song | Dual-inclined lifters for autogenous mills |
SU1144719A1 (en) * | 1983-03-17 | 1985-03-15 | Montvila Vintsas V | Armour lining of tube-type mill |
CN2144023Y (en) * | 1992-01-22 | 1993-10-20 | 王大年 | Pyramidal lining plate for ball mill |
CN2186605Y (en) * | 1994-03-01 | 1995-01-04 | 张洪彬 | Double-thread grading groove lining plate |
-
2001
- 2001-06-14 AU AU6907901A patent/AU6907901A/en active Pending
- 2001-06-14 KR KR1020027017451A patent/KR100754645B1/en active IP Right Grant
- 2001-06-14 JP JP2002503449A patent/JP2003535690A/en not_active Withdrawn
- 2001-06-14 PL PL358740A patent/PL198458B1/en unknown
- 2001-06-14 ES ES01947375T patent/ES2312452T3/en not_active Expired - Lifetime
- 2001-06-14 EP EP01947375A patent/EP1292394B1/en not_active Expired - Lifetime
- 2001-06-14 PT PT01947375T patent/PT1292394E/en unknown
- 2001-06-14 CN CNB018115993A patent/CN1305575C/en not_active Expired - Fee Related
- 2001-06-14 US US10/311,089 patent/US6951315B2/en not_active Expired - Lifetime
- 2001-06-14 MX MXPA02012720A patent/MXPA02012720A/en active IP Right Grant
- 2001-06-14 AT AT01947375T patent/ATE406958T1/en active
- 2001-06-14 CZ CZ20024234A patent/CZ298084B6/en not_active IP Right Cessation
- 2001-06-14 WO PCT/EP2001/006867 patent/WO2001097975A1/en active IP Right Grant
- 2001-06-14 RU RU2003102371/03A patent/RU2266789C2/en not_active IP Right Cessation
- 2001-06-14 CA CA002413342A patent/CA2413342A1/en not_active Abandoned
- 2001-06-14 AU AU2001269079A patent/AU2001269079B2/en not_active Ceased
- 2001-06-14 DE DE60135651T patent/DE60135651D1/en not_active Expired - Lifetime
- 2001-06-14 HU HU0301539A patent/HU228663B1/en not_active IP Right Cessation
- 2001-06-14 BR BRPI0111794-7A patent/BR0111794B1/en not_active IP Right Cessation
Non-Patent Citations (1)
Title |
---|
See references of WO0197975A1 * |
Also Published As
Publication number | Publication date |
---|---|
CN1305575C (en) | 2007-03-21 |
EP1292394B1 (en) | 2008-09-03 |
CZ20024234A3 (en) | 2003-04-16 |
PL358740A1 (en) | 2004-08-09 |
RU2266789C2 (en) | 2005-12-27 |
JP2003535690A (en) | 2003-12-02 |
HUP0301539A2 (en) | 2003-08-28 |
US20040113004A1 (en) | 2004-06-17 |
AU6907901A (en) | 2002-01-02 |
PT1292394E (en) | 2008-11-28 |
PL198458B1 (en) | 2008-06-30 |
CZ298084B6 (en) | 2007-06-13 |
CN1437509A (en) | 2003-08-20 |
BR0111794B1 (en) | 2012-12-11 |
MXPA02012720A (en) | 2004-09-10 |
ATE406958T1 (en) | 2008-09-15 |
BR0111794A (en) | 2003-05-27 |
US6951315B2 (en) | 2005-10-04 |
CA2413342A1 (en) | 2001-12-27 |
HU228663B1 (en) | 2013-05-28 |
KR20030026250A (en) | 2003-03-31 |
ES2312452T3 (en) | 2009-03-01 |
DE60135651D1 (en) | 2008-10-16 |
AU2001269079B2 (en) | 2005-02-10 |
WO2001097975A1 (en) | 2001-12-27 |
KR100754645B1 (en) | 2007-09-05 |
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