EP1479442A2 - Rotary drum mill and relevant inner lining - Google Patents
Rotary drum mill and relevant inner lining Download PDFInfo
- Publication number
- EP1479442A2 EP1479442A2 EP04425366A EP04425366A EP1479442A2 EP 1479442 A2 EP1479442 A2 EP 1479442A2 EP 04425366 A EP04425366 A EP 04425366A EP 04425366 A EP04425366 A EP 04425366A EP 1479442 A2 EP1479442 A2 EP 1479442A2
- Authority
- EP
- European Patent Office
- Prior art keywords
- bars
- drum
- mill according
- panels
- 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.)
- Withdrawn
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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
- B02C17/22—Lining for containers
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21B—FIBROUS RAW MATERIALS OR THEIR MECHANICAL TREATMENT
- D21B1/00—Fibrous raw materials or their mechanical treatment
- D21B1/04—Fibrous raw materials or their mechanical treatment by dividing raw materials into small particles, e.g. fibres
- D21B1/12—Fibrous raw materials or their mechanical treatment by dividing raw materials into small particles, e.g. fibres by wet methods, by the use of steam
- D21B1/30—Defibrating by other means
Definitions
- the present invention relates to a rotary drum mill and in particular to a mill with a cylindrical or frusto-conical rotary drum having an inner lining which improves the efficiency of the milling bodies and allows to distribute them along the longitudinal axis according to their size.
- US 2949247 discloses a mill having an inner lining which comprises a plurality of ribs which are parallel to each other and are slightly inclined with respect to the generatrixes of a cylindrical drum, for example with an angle of about 10°.
- the milling bodies during the rotation of the cylindrical drum, are hampered in their falling from said ribs, so that the bigger milling bodies immediately jump over the ribs, while the smaller ones initially tend to roll along them until the rotation of the drum does not allow their climbing. Therefore, the bigger milling bodies tend to arrange close to the entrance of the cylindrical drum, while the smaller ones arrange themselves at a distance from the entrance which is inversely proportional to their size.
- this known lining has the drawback of reducing the efficiency of the whole mill, since said ribs, forming an obstacle to the motion of the milling bodies, lower their kinetic energy and thus their milling power.
- said ribs tend to wear quickly, so that they must be often replaced, with a consequent increase of the costs and the interruptions for the maintenance.
- the rotary drum of the mill according to the present invention is provided with a helicoidal rib which, acting as a cochlea, separates the smaller milling bodies and milled material from the bigger ones, since the latter undergo the effect of this cochlea in a lower manner, since they can climb their turns more easily. Therefore, the working principle of said helicoidal rib is completely different from the one of the ribs of the prior art.
- said helicoidal rib does not hamper the motion of the milling bodies, which thus maintain their efficiency substantially unaltered, since its turns are almost perpendicular to the generatrixes of the rotary drum and not almost parallel thereto, as in the prior art.
- the inner lining of the mill is made up of elastomeric bars and/or panels which are easily replaceable thanks to a joint system for their mutual joining and/or fixing to the rotary drum, so as to reduce the maintenance costs and times.
- the mill according to the present embodiment of the invention comprises in a known way a drum 1, in particular substantially cylindrical or frusto-conical, which can be rotated by an external motor (not visible in the figure) around its longitudinal axis, which is arranged horizontally or slightly inclined.
- Drum 1 is provided with an inner lining made of an elastomeric material which protects its inner surface from the collisions of the milling bodies which are arranged therein together with the material to be milled.
- one or more bars 2 of elastomeric material are arranged in drum 1 in a slightly curved manner one after the other so as to form at least one helicoidal rib which develops along the inner surface and substantially acts as a cochlea for the milling bodies and/or the material to be milled. Therefore, bars 2 form with the generatrixes of drum 1 a wide angle, at least greater than 60°, and not, as in the prior art, a small angle, in particular equal to about 10°, which does not allow that bars 2 form a helicoidal rib acting as a cochlea, since they start from one end to the other of drum 1 without even forming a turn inside it.
- the angle formed by bars 2 with the generatrixes of drum 1 is comprised between 75° and 85°.
- One or more panels 3 of elastomeric material having a height smaller than the height of bars 2 and a substantially parallelepiped shape are further arranged between a turn of the helicoidal rib formed of bars 2 and an adjacent turn or an end of drum 1. Obviously, bars 2 and panels 3 are cut at the ends of drum 1, so that they do not protrude beyond them.
- humps 4 preferably having a height lower than the difference between the heights of bars 2 and panels 3.
- the height of bars 2, of panels 3 and of the relevant humps 4 is comprised between 12 and 30 cm, 4 and 6 cm and 2 and 4 cm, respectively.
- humps 4 are preferably arranged in a manner substantially perpendicular to bars 2.
- a plurality of section bars 5 are fixed inside drum 1, preferably in a manner substantially perpendicular to bars 2.
- the cross-section of the section bars 5 is shaped for the joint into corresponding grooves made in the lower wall of bars 2 and/or panels 3. In panels 3 these grooves are preferably arranged under humps 4.
- one or more side walls of bars 2 and/or panels 3 are provided with longitudinal ribs 6 and the opposite walls are provided with corresponding longitudinal grooves. With this arrangement, bars 2 and panels 3 can fit with the adjacent bars 2 and/or panels 3, thereby improving their mutual joining.
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- Engineering & Computer Science (AREA)
- Food Science & Technology (AREA)
- Life Sciences & Earth Sciences (AREA)
- Wood Science & Technology (AREA)
- Mechanical Engineering (AREA)
- Crushing And Grinding (AREA)
Abstract
Description
- The present invention relates to a rotary drum mill and in particular to a mill with a cylindrical or frusto-conical rotary drum having an inner lining which improves the efficiency of the milling bodies and allows to distribute them along the longitudinal axis according to their size.
- US 2949247 discloses a mill having an inner lining which comprises a plurality of ribs which are parallel to each other and are slightly inclined with respect to the generatrixes of a cylindrical drum, for example with an angle of about 10°. With this arrangement, the milling bodies, during the rotation of the cylindrical drum, are hampered in their falling from said ribs, so that the bigger milling bodies immediately jump over the ribs, while the smaller ones initially tend to roll along them until the rotation of the drum does not allow their climbing. Therefore, the bigger milling bodies tend to arrange close to the entrance of the cylindrical drum, while the smaller ones arrange themselves at a distance from the entrance which is inversely proportional to their size.
- However, this known lining has the drawback of reducing the efficiency of the whole mill, since said ribs, forming an obstacle to the motion of the milling bodies, lower their kinetic energy and thus their milling power.
- Furthermore, said ribs tend to wear quickly, so that they must be often replaced, with a consequent increase of the costs and the interruptions for the maintenance.
- It is therefore an object of the present invention to provide a mill having an inner lining which is free from said disadvantages. Said object is achieved with a mill and a lining, the main features of which are disclosed in
claims 1 and 12, while other features are disclosed in the remaining claims. - As a matter of fact, the rotary drum of the mill according to the present invention is provided with a helicoidal rib which, acting as a cochlea, separates the smaller milling bodies and milled material from the bigger ones, since the latter undergo the effect of this cochlea in a lower manner, since they can climb their turns more easily. Therefore, the working principle of said helicoidal rib is completely different from the one of the ribs of the prior art.
- Furthermore, said helicoidal rib does not hamper the motion of the milling bodies, which thus maintain their efficiency substantially unaltered, since its turns are almost perpendicular to the generatrixes of the rotary drum and not almost parallel thereto, as in the prior art.
- According to a particular aspect of the invention, the inner lining of the mill is made up of elastomeric bars and/or panels which are easily replaceable thanks to a joint system for their mutual joining and/or fixing to the rotary drum, so as to reduce the maintenance costs and times.
- Further advantages and features of the mill and the lining according to the present invention will become clear to those skilled in the art from the following detailed and non-limiting description of an embodiment thereof with reference to the attached drawings, wherein:
- figure 1 shows a side view in a longitudinal section of the mill according to said embodiment, which is partially provided with the inner lining;
- figure 2 shows an enlarged partial and sectioned view of the lining of the mill of figure 1;
- figure 3 shows a view sectioned along plane III-III of the lining of figure 2 (for clarity the curvature of the mill is not illustrated in figure 3).
- Referring to said figures, it is seen that the mill according to the present embodiment of the invention comprises in a known way a
drum 1, in particular substantially cylindrical or frusto-conical, which can be rotated by an external motor (not visible in the figure) around its longitudinal axis, which is arranged horizontally or slightly inclined.Drum 1 is provided with an inner lining made of an elastomeric material which protects its inner surface from the collisions of the milling bodies which are arranged therein together with the material to be milled. - According to the invention, one or
more bars 2 of elastomeric material are arranged indrum 1 in a slightly curved manner one after the other so as to form at least one helicoidal rib which develops along the inner surface and substantially acts as a cochlea for the milling bodies and/or the material to be milled. Therefore,bars 2 form with the generatrixes of drum 1 a wide angle, at least greater than 60°, and not, as in the prior art, a small angle, in particular equal to about 10°, which does not allow thatbars 2 form a helicoidal rib acting as a cochlea, since they start from one end to the other ofdrum 1 without even forming a turn inside it. In particular, in the present embodiment, the angle formed bybars 2 with the generatrixes ofdrum 1 is comprised between 75° and 85°. - One or
more panels 3 of elastomeric material having a height smaller than the height ofbars 2 and a substantially parallelepiped shape are further arranged between a turn of the helicoidal rib formed ofbars 2 and an adjacent turn or an end ofdrum 1. Obviously,bars 2 andpanels 3 are cut at the ends ofdrum 1, so that they do not protrude beyond them. - For increasing the efficiency of the milling bodies,
panels 3 are provided withhumps 4 preferably having a height lower than the difference between the heights ofbars 2 andpanels 3. In particular, the height ofbars 2, ofpanels 3 and of therelevant humps 4 is comprised between 12 and 30 cm, 4 and 6 cm and 2 and 4 cm, respectively. Furthermore,humps 4 are preferably arranged in a manner substantially perpendicular tobars 2. - For facilitating the assemblage and the maintenance of the inner lining of the mill, a plurality of
section bars 5 are fixed insidedrum 1, preferably in a manner substantially perpendicular tobars 2. The cross-section of thesection bars 5 is shaped for the joint into corresponding grooves made in the lower wall ofbars 2 and/orpanels 3. Inpanels 3 these grooves are preferably arranged underhumps 4. - Furthermore, one or more side walls of
bars 2 and/orpanels 3 are provided withlongitudinal ribs 6 and the opposite walls are provided with corresponding longitudinal grooves. With this arrangement,bars 2 andpanels 3 can fit with theadjacent bars 2 and/orpanels 3, thereby improving their mutual joining.
Claims (14)
- Mill comprising a drum (1) which can be rotated around its longitudinal axis and is provided with an inner lining (2, 3) made of an elastomeric material, characterized in that this inner lining (2, 3) comprises at least one helicoidal rib of elastomeric material which develops along the inner surface of the drum (1) and substantially acts as a cochlea for the milling bodies and/or the material to be milled.
- Mill according to the previous claim, characterized in that said helicoidal rib is made up of one or more bars (2) of elastomeric material are arranged in a slightly curved manner one after the other.
- Mill according to claim 2, characterized in that the drum (1) is substantially cylindrical or frusto-conical and the bars (2) form with the generatrixes of the drum (1) an angle greater than 60°.
- Mill according to claim 3, characterized in that the bars (2) form with the generatrixes of the drum (1) an angle comprised between 75° and 85°.
- Mill according to one of the previous claims, characterized in that one or more panels (3) of elastomeric material having a height smaller than the height of bars (2) and a substantially parallelepiped shape are arranged between a turn of the helicoidal rib formed of the bars (2) and an adjacent turn or an end of the drum (1).
- Mill according to claim 5, characterized in that said panels (3) are provided with humps (4).
- Mill according to claim 6, characterized in that the height of said humps (4) is lower than the difference between the heights of the bars (2) and of the panels (3).
- Mill according to claim 6 or 7, characterized in that the humps (4) are arranged in a manner substantially perpendicular to the bars (2).
- Mill according to one of the previous claims, characterized in that a plurality of section bars (5) are fixed inside the drum (1), the cross-section of these section bars (5) being shaped for the joint into corresponding grooves made in the lower wall of the bars (2) and/or of the panels (3).
- Mill according to claim 9, characterized in that the section bars (5) are fixed inside the drum (1) in a manner substantially perpendicular to the helicoidal rib.
- Mill according to claim 9 or 10, characterized in that the lower grooves of the panels (3) are arranged under the relevant humps (4).
- Lining for mills with a rotary drum (1), characterized by comprising a bar (2) of elastomeric material having the lower wall provided with grooves for the joint into corresponding section bars (5) fixed inside the drum (1).
- Lining according to claim 12, characterized in that one or more side walls of the bar (2) are provided with longitudinal ribs (6) and that the opposite walls are provided with corresponding longitudinal grooves.
- Lining according to claim 12 or 13, characterized in that the height of the bar (2) is comprised between 12 and 30 cm.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
ITMI20030996 | 2003-05-20 | ||
ITMI20030996 ITMI20030996A1 (en) | 2003-05-20 | 2003-05-20 | ROTARY CHAMBER MILL AND RELATED INTERNAL COATING. |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1479442A2 true EP1479442A2 (en) | 2004-11-24 |
EP1479442A3 EP1479442A3 (en) | 2006-03-08 |
Family
ID=33042704
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP04425366A Withdrawn EP1479442A3 (en) | 2003-05-20 | 2004-05-20 | Rotary drum mill and relevant inner lining |
Country Status (2)
Country | Link |
---|---|
EP (1) | EP1479442A3 (en) |
IT (1) | ITMI20030996A1 (en) |
Cited By (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP1810752A1 (en) * | 2006-01-18 | 2007-07-25 | B & B S.r.l. | Inner lining for rotary drum mills |
WO2011012629A1 (en) | 2009-07-28 | 2011-02-03 | B & B S.R.L. | Protective lining for walls of mills, mixers, hoppers and other machines |
RU2531438C2 (en) * | 2012-12-17 | 2014-10-20 | Федеральное государственное автономное образовательное учреждение высшего профессионального образования "Национальный исследовательский технологический университет "МИСиС" | Sizing separator |
CN108201948A (en) * | 2016-12-17 | 2018-06-26 | 重庆市银盛模具有限公司 | For the equipment of injection mould material fragmentation |
CN108201943A (en) * | 2016-12-17 | 2018-06-26 | 重庆市银盛模具有限公司 | Injection mold materials reducing mechanism |
RU181334U1 (en) * | 2017-10-19 | 2018-07-11 | Виктор Алексеевич Степаненко | Metal plate for lining a ball drum mill |
CN110248742A (en) * | 2018-01-10 | 2019-09-17 | 尹炳洹 | For obtaining the process units and production method that meet the circulation aggregate that building waste recycles benchmark |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB807711A (en) * | 1954-05-10 | 1959-01-21 | Smidth & Co As F L | Improvements relating to liners for tube or ball mills |
US3580520A (en) * | 1968-10-29 | 1971-05-25 | Stedman Foundry And Machine Co | Breaker plate assembly for a disintegrator |
US4736894A (en) * | 1985-02-25 | 1988-04-12 | Corporacion Nacional Del Cobre De Chile | Grinding mill lining system |
Family Cites Families (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
SU1144719A1 (en) * | 1983-03-17 | 1985-03-15 | Montvila Vintsas V | Armour lining of tube-type mill |
-
2003
- 2003-05-20 IT ITMI20030996 patent/ITMI20030996A1/en unknown
-
2004
- 2004-05-20 EP EP04425366A patent/EP1479442A3/en not_active Withdrawn
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB807711A (en) * | 1954-05-10 | 1959-01-21 | Smidth & Co As F L | Improvements relating to liners for tube or ball mills |
US3580520A (en) * | 1968-10-29 | 1971-05-25 | Stedman Foundry And Machine Co | Breaker plate assembly for a disintegrator |
US4736894A (en) * | 1985-02-25 | 1988-04-12 | Corporacion Nacional Del Cobre De Chile | Grinding mill lining system |
Non-Patent Citations (2)
Title |
---|
DATABASE WPI Section PQ, Week 198539 Derwent Publications Ltd., London, GB; Class P41, AN 1985-241638 XP002349433 -& SU 1 144 719 A (MONTVILA V V) 15 March 1985 (1985-03-15) * |
SCHEIBE W: "100 JAHRE ROHRKUGELMUEHLE - EIN HISTORISCHER RUECKBLICK" ZKG INTERNATIONAL, BAUVERLAG, WIESBADEN, DE, vol. 46, no. 3, 1 March 1993 (1993-03-01), pages 123-128, XP000364117 ISSN: 0722-4397 * |
Cited By (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP1810752A1 (en) * | 2006-01-18 | 2007-07-25 | B & B S.r.l. | Inner lining for rotary drum mills |
WO2011012629A1 (en) | 2009-07-28 | 2011-02-03 | B & B S.R.L. | Protective lining for walls of mills, mixers, hoppers and other machines |
RU2531438C2 (en) * | 2012-12-17 | 2014-10-20 | Федеральное государственное автономное образовательное учреждение высшего профессионального образования "Национальный исследовательский технологический университет "МИСиС" | Sizing separator |
CN108201948A (en) * | 2016-12-17 | 2018-06-26 | 重庆市银盛模具有限公司 | For the equipment of injection mould material fragmentation |
CN108201943A (en) * | 2016-12-17 | 2018-06-26 | 重庆市银盛模具有限公司 | Injection mold materials reducing mechanism |
RU181334U1 (en) * | 2017-10-19 | 2018-07-11 | Виктор Алексеевич Степаненко | Metal plate for lining a ball drum mill |
CN110248742A (en) * | 2018-01-10 | 2019-09-17 | 尹炳洹 | For obtaining the process units and production method that meet the circulation aggregate that building waste recycles benchmark |
Also Published As
Publication number | Publication date |
---|---|
EP1479442A3 (en) | 2006-03-08 |
ITMI20030996A1 (en) | 2004-11-21 |
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