US3677479A - Automatic grading linings for cylindrical tube or similar mills - Google Patents

Automatic grading linings for cylindrical tube or similar mills Download PDF

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Publication number
US3677479A
US3677479A US58962A US3677479DA US3677479A US 3677479 A US3677479 A US 3677479A US 58962 A US58962 A US 58962A US 3677479D A US3677479D A US 3677479DA US 3677479 A US3677479 A US 3677479A
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Prior art keywords
mill
barrel
diaphragm
lining
obtuse angle
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US58962A
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English (en)
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Pierre Arsene Slegten
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    • 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

  • Linings of the kind which comprise formed plates whose inner surface in the mill bounds a series of trunco-conical volumes whichare flared towards the mill entry. Linings of this kind are used to produce automatic grading of the grinding media in decreasing order of magnitude from the entry to the exit of the grinding chamber housing such media.
  • Acceleration of the flow speed is all the more dangerous since in using automatic grading linings, some, if at all, of the partitions which separate the mill into different compartments and form an obstacle to unground material are removed. Moreover, in large-scale industrial mills as built at the present time, the tendency, for manufacturing reasons, is to reduce the length to diameter ratio of the mill, thus further reducing the time spent by the material in the mill during grinding.
  • an automatic grading lining for a cylindrical mill whose inner surface in the mill bounds a series of trunco-conical volumes which are flared towards the mill entry and which lining further comprises one or more diaphragms having a central aperture of smaller diameter than the narrowest diameter portions of the truncoconical volumes and being disposed in a plane substantially perpendicular to the mill axis, the side of each diaphragm which is to face the mill inlet forming an obtuse angle with the mill barrel on the mill inlet side, the side which is to face the mill outlet being preferably vertical.
  • the invention also provides a lining for a cylindrical mill, which lining has a substantially cylindrical inner surface, and which lining further comprises one or more diaphragms being disposed in a plane substantially perpendicular to the mill axis, the side of each diaphragm which is to face the mill inlet forming an obtuse angle with the mill barrel on the mill inlet side, the side which is to face the mill outlet being preferably vertical.
  • the invention further provides a cylindrical mill having a lining as defined above.
  • FIG. I shows a partial vertical section, taken along the longitudinal axis, of a mill having a lining according to the invention.
  • FIG. 2 shows a section of the mill of FIG. I along the line ll-lI thereof.
  • FIG. 3 shows an enlarged partial view of the mill of FIG. 1.
  • FIG. 4 shows a section of the mill of FIG. 1 along the line lV-IV of FIG. 3.
  • FIGS. 5 to 7 show alternative diaphragm sections.
  • FIG. I shows a rotatable cylindrical mill comprising a barrel 1 having an internal lining 2.
  • the inner surface of the lining bounds a series of contiguous trunco-conical volumes 3, which are flared towards the mill inlet.
  • the material for grinding will move as shown by the straight arrow.
  • the lining comprises at least one annular diaphragm 4.
  • the diaphragm 4 has an upstream surface 5 disposed on the mill inlet side, and a downstream surface 6 disposed on the mill outlet side.
  • the mill is rotatable in the direction indicated by the arcuate arrow and is partly filled with grinding media 7, which are usually round, and material 8 being ground.
  • the grinding media 7 are graded automatically so that their dimensions diminish regularly from the mill inlet towards the mill outlet.
  • FIG. 2 shows trajectories 9 of the grinding media 7 during rotation of the mill.
  • the diaphragms 4 form a series of barriers holding back the material 8 being ground, each diaphragm separating two groups of contiguous volumes 3.
  • the material cannot cross such barriers except in a central zone 10 where the grinding media are particularly active since such zone lies substantially in the trajectories 9.
  • the amount of material escaping the action of the grinding media is, therefore reduced, since the material can no longer circulate freely in the mill, advancing above zone 11 of the base of the trajectories.
  • the larger material has a tendency to descend and, therefore, move more slowly in the direction of the outlet than the finer material.
  • the larger material is, therefore, subjected for a longer time to the action of the grinding media than the fine material, such selective action improving the grinding of the coarsest material.
  • the height of the diaphragms 4 is determined in relation to the diameter of the mill and its coefficient of filling with grinding media, and also on the required dwell time of the material. For instance, for the wet grinding of the raw material for cement making, satisfactory results are obtained by giving the barriers a height of 18-20 percent of the inside diameter of the mill barrel, for a coefficient of filling with grinding media of 30 percent. The height of the barriers is generally reduced or raised in proportion with a reduction or increase in the coefficient of filling.
  • the grinding media are graded on the one hand in each trunco-conical volume 3 bounded by the lining, but also from one volume 3 or one group of volumes 3 to the next, inter alia to make the grinding media move towards the outlet as they become worn. If their shape is unsuitable, the diaphragms impede grading from one group of volumes to the next, and thus have an adverse effect on the automatic classification action of the lining, more particularly if their height is enough to effectively decelerate the material.
  • the classification disturbances caused by the diaphragms 4 can be avoided by so inclining their upstream surfaces 5 as to form an obtuse angle with the mill barrel on the mill inlet side, the downstream surface 6 of the diaphragms being inclined substantially parallel with the upstream face as shown in FIG. 5 (this arrangement is the most advantageous as regards the weight of the diaphragm). Still better results are obtained by inclining the downstream surface oppositely from the upstream surface, the angle formed with the mill barrel on the mill outlet side by the downstream surface being however less than that formed by the upstream face with the mill barrel on the mill inlet side (FIG. 6), but the best classification results have been obtained with the downstream face vertical (FIG. 7). In the majority of cases, a satisfactory grading effect is obtained by so inclining the upstream face that it forms an angle a of about 97 with the mill barrel on the mill inlet side.
  • each of the plates 13 forming the lining l is attached to the barrel by a bolt.
  • the inner surface of a ring of plates bounds in the mill a trunco-conical volume 3 (FIG. 1) flared in the direction of the mill inlet, the successive rings of plates forming a succession of contiguous trunco-conical volumes.
  • the downstream portion 15 of each ring overlaps the adjoining ring to prevent the material being ground to circulate between the plates during rotation, thus wearing the barrel.
  • the plates are formed with corrugations 16 to raise the grinding media suitably.
  • the diaphragms 4 are interposed at suitable intervals between two trunco-conical volumes. To make sure that the plating is continuous, foot 17 of the diaphragm extends beneath the upstream plate ring and overhangs the downstream ring.
  • each diaphragm 4 is approximately 20 percent of the inside diameter of the mill barrel.
  • the upstream surface 5 of the diaphragm forms an angle of 97 with the mill barrel on the mill inlet side, the downstream surface 6 being perpendicular to the mill barrel.
  • the length of the foot of the diaphragm is equal to the length of the plates forming the trunco-conical volumes, so that each of the rings can readily be interchanged with a diaphragm.
  • Each diaphragm is divided into elements 18 (FIG. 4), each of which is attached by a bolt 14.
  • Each element 18 forms a part of a diaphragm 4 (i.e., 4a, 4b, 4c, 4n for each element 18a, 18b, 18c, 1811 as shown in FIG. 4) unitary with a foot 17.
  • the upstream portion l7 of each foot extends beneath the plating element 13 immediately upstream, while the downstream portion 17 overlaps a portion of the plating element 13 immediately downstream.
  • the diaphragm proper 4 is disposed downstream of the foot 17 portion l7 and upstream of the foot 17 which is formed immediately downstream of such portion 4 with a hole 19 through which a bolt 14 extends for attaching the element 18 to the mill barrel 1.
  • the plating can be made of cast iron, steel, rubber or any other suitable material.
  • the number of diaphragms is selected in relation to the decelerating effect desired in most cases such effect will be adequate with one ring disposed at about every 2 meters. For some applications, a single ring will be enough to hold back the material.
  • diaphragms having their own grading effect can perfectly well be used, disposing between the diaphragms plates whose inner surface does not form successive trunco-conical volumes but is substantially cylindrical.
  • the inner surface of the plates disposed between the diaphragms can be either smooth or formed with corrugations of which the crest lines and valley lines converge towards the mill axis, are parallel to the mill axis or diverge from the mill axis, or with any roughnesses or hollows adapted to raise the grinding media suitably.
  • a mill barrel having an inner lining, the inner surface of the lining comprising an axial series of contiguous truncated conical annular portions each of which is flared towards the mill inlet end; and at least one diaphragm being positioned between two adjacent of said conical portions, said diaphragm having a central aperture of smaller diameter than the narrowest diameter of each of said truncated conical lining portions, and being disposed in a plane extending generally transversely to the mill axis, the surface of the diaphragm facing the mill inlet end forming an obtuse angle with the mill barrel, and the surface of the diaphragm facing the mill outlet end forming an angle with the mill barrel which is always smaller than said obtuse angle formed between the surface of the diaphragm facing the mill inlet end and the mill barrel.
  • said diaphragm comprises a plurality of peripheric segments, each said segment including an outer foot portion in contact with the peripheral inner surface of said mill barrel, aperture means in each of said foot portions, and fastener means adapted to extend through said aperture means for fastening said segments to said mill barrel.
  • a mill as claimed in claim 1 including a plurality of said diaphragms being positioned in said mill barrel at predetermined axial intervals.

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  • Engineering & Computer Science (AREA)
  • Food Science & Technology (AREA)
  • Crushing And Grinding (AREA)
US58962A 1969-07-31 1970-07-28 Automatic grading linings for cylindrical tube or similar mills Expired - Lifetime US3677479A (en)

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BE736856 1969-07-31

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US (1) US3677479A (en(2012))
BE (1) BE736856A (en(2012))
ES (1) ES382331A1 (en(2012))
FR (1) FR2054238A5 (en(2012))
GB (1) GB1309654A (en(2012))

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3880365A (en) * 1972-10-23 1975-04-29 Oesterr Amerikan Magnesit Mill
US4200242A (en) * 1978-05-29 1980-04-29 Kawasaki Jukogyo Kabushiki Kaisha Liner in grinding mill
WO1988007411A1 (en) * 1987-03-26 1988-10-06 Belgorodsky Tekhnologichesky Institut Stroitelnykh Ball mill
US5690285A (en) * 1993-12-29 1997-11-25 Slegten Societe Anonyme Lining elements for a rotary mill and mill equipped with such elements
CN104741191A (zh) * 2014-07-23 2015-07-01 宋鲁江 分级衬板
CN104741189A (zh) * 2014-07-23 2015-07-01 宋鲁江 一种波纹衬板
CN104741188A (zh) * 2014-07-23 2015-07-01 宋鲁江 波纹衬板
CN104741193A (zh) * 2014-07-23 2015-07-01 宋鲁江 一种分级衬板

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2194222A (en) * 1986-07-30 1988-03-02 Nickel Resins Limited Tile for a wear-resistant lining for e.g. a chute
FR2669558A1 (fr) * 1990-11-22 1992-05-29 Cambier Benjamin Broyeur a boulets a pistes de roulement laterales et plaques de blindage pourvues de telles pistes.
RU2314160C2 (ru) * 2005-11-28 2008-01-10 Закрытое акционерное общество "Золотодобывающая компания "Полюс" Сортирующая бронефутеровка барабанных мельниц (варианты)

Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE508912A (en(2012)) *
US953092A (en) * 1909-03-27 1910-03-29 Joseph E Kennedy Combined ball and tube mill.
US971108A (en) * 1910-03-05 1910-09-27 Willard J Bell Grinding-machine.
US1607858A (en) * 1925-06-06 1926-11-23 Traylor Engineering & Mfg Comp Ball mill
US2661908A (en) * 1950-05-08 1953-12-08 Jean A Slegten Air swept tube mill with pocketed liner structure for automatic classification of grinding bodies and ground material
FR1107276A (fr) * 1953-07-27 1955-12-29 Broyeur à cylindres creux
US2801804A (en) * 1955-05-10 1957-08-06 Smidth & Co As F L Ball mill linings and grinding body charges
US2876957A (en) * 1954-10-23 1959-03-10 Henricot Usines Emile Sa Ribbed frusto-conical lining for tube mills
US3529781A (en) * 1966-06-23 1970-09-22 Smidth & Co As F L Rotary grinding mill

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE508912A (en(2012)) *
US953092A (en) * 1909-03-27 1910-03-29 Joseph E Kennedy Combined ball and tube mill.
US971108A (en) * 1910-03-05 1910-09-27 Willard J Bell Grinding-machine.
US1607858A (en) * 1925-06-06 1926-11-23 Traylor Engineering & Mfg Comp Ball mill
US2661908A (en) * 1950-05-08 1953-12-08 Jean A Slegten Air swept tube mill with pocketed liner structure for automatic classification of grinding bodies and ground material
FR1107276A (fr) * 1953-07-27 1955-12-29 Broyeur à cylindres creux
US2876957A (en) * 1954-10-23 1959-03-10 Henricot Usines Emile Sa Ribbed frusto-conical lining for tube mills
US2801804A (en) * 1955-05-10 1957-08-06 Smidth & Co As F L Ball mill linings and grinding body charges
US3529781A (en) * 1966-06-23 1970-09-22 Smidth & Co As F L Rotary grinding mill

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3880365A (en) * 1972-10-23 1975-04-29 Oesterr Amerikan Magnesit Mill
US4200242A (en) * 1978-05-29 1980-04-29 Kawasaki Jukogyo Kabushiki Kaisha Liner in grinding mill
WO1988007411A1 (en) * 1987-03-26 1988-10-06 Belgorodsky Tekhnologichesky Institut Stroitelnykh Ball mill
US5690285A (en) * 1993-12-29 1997-11-25 Slegten Societe Anonyme Lining elements for a rotary mill and mill equipped with such elements
CN104741191A (zh) * 2014-07-23 2015-07-01 宋鲁江 分级衬板
CN104741189A (zh) * 2014-07-23 2015-07-01 宋鲁江 一种波纹衬板
CN104741188A (zh) * 2014-07-23 2015-07-01 宋鲁江 波纹衬板
CN104741193A (zh) * 2014-07-23 2015-07-01 宋鲁江 一种分级衬板

Also Published As

Publication number Publication date
ES382331A1 (es) 1972-11-16
BE736856A (en(2012)) 1969-12-31
GB1309654A (en) 1973-03-14
FR2054238A5 (en(2012)) 1971-04-16

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