US3624797A - Multiple compartment grinding mills - Google Patents

Multiple compartment grinding mills Download PDF

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Publication number
US3624797A
US3624797A US884149A US3624797DA US3624797A US 3624797 A US3624797 A US 3624797A US 884149 A US884149 A US 884149A US 3624797D A US3624797D A US 3624797DA US 3624797 A US3624797 A US 3624797A
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United States
Prior art keywords
compartment
grinding
head assembly
central
division head
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
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US884149A
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English (en)
Inventor
Eugene P Waddell
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.)
Allis Chalmers Corp
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Allis Chalmers Corp
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Assigned to WOODS KATHLEEN D., AS TRUSTEE, CONNECTICUT NATIONAL BANK THE, A NATIONAL BANKING ASSOCIATION AS TRUSTEE reassignment WOODS KATHLEEN D., AS TRUSTEE SECURITY INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: ALLIS-CHALMERS CORPORATION A DE CORP.
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Expired - Lifetime legal-status Critical Current

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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
    • B02C17/04—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 with unperforated container
    • B02C17/06—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 with unperforated container with several compartments

Definitions

  • a grinding mill having a cylindrical shell for rotation about its central axis and a division head that divides the interior of the shell into axially disposed compartments, one compartment containing steel rods for relatively coarse grinding and another compartment containing steel balls for finer grinding.
  • the division head is an assembly of elements in which a pair of the elements are annular bulkheads perpendicular to the central axis and spaced apart from each other.
  • the annular bulkhead on the coarse grinding side of the division head assembly defines a central opening of smaller diameter than the central opening defined by the annular bulkhead on the fine grinding side of the division head assembly.
  • a liner extends between the radially inner peripheries of the two annular bulkheads and defines a central passage through the division head assembly with a surface having the configuration of a truncated cone with its central axis coincident with the central axis of the shell and with its apex end pointed toward the coarse grinding compartment.
  • a shielding disk is concentrically mounted within the conical central passage in a plane perpendicular to the shell axis and supported by a plurality of arcuately spaced mounting blocks between the outer periphery of the shielding disk and the inner periphery of the conical central passage.
  • the shield blocks a mass of grinding balls which tends to surge from the ball compartment toward the rod compartment during periods of mill acceleration at startup and during periods of deceleration when being stopped.
  • the normal flow of pulp from the rod compartment into the ball compartment passes through the passage in channels between the mounting blocks and radially outward of the shielding disk.
  • This invention relates to multiple compartment cylindrical grinding mills having a compartment containing steel rods for coarse grinding and a compartment containing steel balls for finer grinding, and in particular to a division head assembly between the compartments.
  • Such an arrangement provides for pulp in both compartmentsflowing into a central discharge chamber rather than a one direction through-flow movement of pulp from the coarse grinding compartment, through the division head assembly, to the fine grinding compartment.
  • central discharge mill rather than a one direction end to end movement of pulp, much greater classifier capacity must be provided because. partly ground material which needs further grinding and finely ground material needing no further grinding, are mixed and discharged together through a common discharge port in a central portion of the mill.
  • a grinding mill having a cylindrical shell for rotation about its central axis and a division head that divides the interior of the shell into axially disposed compartments, one compartment containing steel rods for relatively coarse grinding and another compartment containing steel balls for finer grinding.
  • the division head is an assembly of elements in which a pair of the elements are annular bulkheads perpendicular to the central axis and spaced apart from each other.
  • the annular bulkhead on the coarse grinding side of the division head assembly defines a central opening of smaller diameter than the central opening defined by the annular bulkhead on the fine grinding side of the division head assembly.
  • a liner extends between the radially inner peripheries of the two annular bulkheads and defines a central passage through the division head assembly with a surface having the configuration of a truncated cone with its central axis coincident with the central axis of the shell, and with the apex end of the configuration pointed toward the coarse grinding compartment.
  • Balls that enter the rod compartment via a path external to the shell as in closed circuit grinding can roll down the slope from the rod compartment back to the ball compartment.
  • a division head does provide the described result during normal operation, during periods of mill acceleration at startup and during periods of deceleration when the mill is stopping, the charge of grinding balls in the fine grinding compartment tends to surge toward the division head. During such periods the grinding balls could move up the slope of the central passage through the division head and enter the rod compartment where they interfere with the grinding action of the rods. It is to this problem that the present invention is directed and the provision of a solution to this problem is a principal object of the present invention.
  • a shielding disk is concentrically mounted within the conical central passage through the division head assembly.
  • the disk is arranged in a plane perpendicular to the shell axis and is supported by a plurality of arcuately spaced mounting blocks between the outer periphery of the shielding disk and the inner periphery of the conical central passage.
  • the shielding disk blocks the surge of balls from moving into the rod compartment during acceleration and deceleration while the normal flow of pulp from the rod compartment to the ball compartment during normal operation of the mill, passes through channels between the mounting blocks and radially outward of the shielding disk.
  • FIG. 1 of the accompanying drawing shows a side elevation, in section, a grinding mill according to the present invention
  • FIG. 2 shows to enlarged scale, a portion of a division head assembly in FIG. 1;
  • FIG. 3 is an end view of the portion of the division head assembly shown in FIG. 2.
  • the multistage grinding mill disclosed in FIG. 1 of the drawing comprises in general a rotary cylindrical shell casing 1 illustrated as having uniform or substantially uniform diameter throughout its length, the casing being provided with feed and discharge end heads 2, 3, respectively.
  • the casing 1 is divided into a pair of grinding chambers 4 and 5 in a manner and by structure that will be described in detail later.
  • the chamber 4 on the inlet end of the casing l is provided with a plurality of rods 6 that provide for relatively coarse grinding in the chamber 4.
  • the chamber 5 is provided with a plurality of balls 7 for relatively fine grinding of material in the chamber 5.
  • the mill is rotatably mounted in suitable end bearings which carry feed and discharge trunnions 11 and 12, respectively.
  • Rotary motion about its horizontal central axis is imparted to the mill by means of power applied to a driving gear 13 secured either around the inlet end of the casing 1 as shown or around the feed trunnion (not shown).
  • the feed end of the mill is provided with a feeder such as feeder 15 for introducing the material which is to be reduced into the inlet end of the coarse grinding chamber 4 through the feed trunnion ll.
  • the discharge end of chamber 5 is provided with a perforated plate .19 which is spaced from the end head 3. Located within the space between plate 19 and the end head 3 is a series of elevating vanes 20. The inner extremities of the elevating vanes 20 are located close to a central discharge cone 21, the apex of which is directed toward the discharge trunnion l2.
  • FIGS. 1 and 2 for dividing the casing 1 into the two grinding compartments 4 and 5, includes an arrangement of parts shown to enlarged scale in FIG. 2 and FIG. 3.
  • a division head assembly is mounted within the mill comprising a pair of spaced annular bulkheads 26, 27.
  • the side of bulkhead 26 facing the feed head 2 and the side of bulkhead 27 facing the discharge head 3, are each provided with replaceable wear liners 28, 29 respectively.
  • Liner 29 projects farther radially inward than does bulkhead 27 but the reverse is true on the opposite side of the division head assembly where the liner 28 does not project as far radially as bulkhead 26 thus leaving an inner portion of bulkhead 26 unprotected by liner 28.
  • the inner portion of bulkhead 26 not protected by liner 28 is however covered and protected by a liner 30 having both a radial portion 31 and an axially extending portion 32.
  • a liner extends between the axial extending portion 32 of liner 30 and the radially inner portion of liner 29, and portion 32 and liner 35 together provide and define a central passage 36 through the division head assembly 25 having openings 37, 38 and a configuration therebetween of a truncated cone with its apex end pointed toward the feed head 2 end of the mill and a base flange 39 on the end thereof facing the discharge head 3.
  • Shielding means comprising a disk 40 is mounted concentrically within the central passage 36 and perpendicular to the central axis -xx'
  • a plurality of mounting blocks 41 are connected to the outer periphery of disk 40, as by welding, and blocks 41 are connected to the inner periphery of liner 35 by bolts 42 that pass through blocks 41, liner 35, bulkhead 26 and liner 30 to unite the assembly of those parts.
  • a peripheral pulp channel 43 is defined between each adjacent pair of blocks 41, the outer circumference of disk 40 and an intermediate diameter on the inner surface of liner 35 indicated in FIG. 3 by the broken line circle 44.
  • material to be ground is delivered to the feeder such as feeder 15 and fed into the coarse grinding chamber 4 where the rods 6, which tumble as gear 13 turns casing 1, provide a preliminary grinding of the feed material to provide a coarse pulp which will overflow from chamber 4 through the passage 36 in the division head assembly 25, and into chamber 5.
  • the steel balls 7 tumble and provide a further grinding action to provide a finer pulp which flows through the perforated plate 19 to be picked up by the vanes 20 and dumped into the discharge cone 21.
  • a grinding mill having a cylindrical shell mounted for rotation about its central axis, a compartment containing media for coarse grinding and a compartment containing media for finer grinding separated by a division head assembly, said division head assembly comprising a first and a second annular bulkhead perpendicular to said axis and spaced apart from each other, the annular bulkhead on the coarse grinding side of the division head assembly defining a central opening of smaller diameter than a central opening defined by the annular bulkhead on the finer grinding side of the division head assembly, an axially extending liner extending between and connected to the radially inner peripheries of the first and second bulkheads and with said liner having an inner surface defining a central passage through the division head assembly with a surface having a configuration of a truncated cone with a central axis coincident with the central axis of the shell and with an apex end pointed toward the coarse grinding compartment, and shielding means within said central passage presenting a surface blocking a central portion of said passage and
  • a grinding mill having a cylindrical shell mounted for rotation about its central axis, a compartment containing rods for coarse grinding and a compartment containing balls for finer grinding separated by a division head assembly, said division head assembly comprising a first and a second annular bulkhead perpendicular to said axis and spaced apart from each other, the annular bulkhead on the rod compartment side of thedivision head assembly defining a central opening of smaller diameter than a central opening defined by the annular bulkhead on the ball compartment side of the division head assembly, an axially extending liner extending between and connected to the radially inner peripheries of the first and second bulkheads and with said liner having an inner surface defining a central passage through the division head assembly with a surface having a configuration of a truncated cone with a central axis coincident with the central axis of the shell and with an apex end pointed toward the rod compartment, a shielding disk concentrically mounted within said central passage and perpendicular to

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  • Engineering & Computer Science (AREA)
  • Food Science & Technology (AREA)
  • Crushing And Grinding (AREA)
  • Crushing And Pulverization Processes (AREA)
US884149A 1969-12-11 1969-12-11 Multiple compartment grinding mills Expired - Lifetime US3624797A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US88414969A 1969-12-11 1969-12-11

Publications (1)

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US3624797A true US3624797A (en) 1971-11-30

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Family Applications (1)

Application Number Title Priority Date Filing Date
US884149A Expired - Lifetime US3624797A (en) 1969-12-11 1969-12-11 Multiple compartment grinding mills

Country Status (6)

Country Link
US (1) US3624797A (enrdf_load_stackoverflow)
CA (1) CA934724A (enrdf_load_stackoverflow)
ES (1) ES198759Y (enrdf_load_stackoverflow)
FR (1) FR2073576A5 (enrdf_load_stackoverflow)
GB (1) GB1265637A (enrdf_load_stackoverflow)
ZA (1) ZA708149B (enrdf_load_stackoverflow)

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3758041A (en) * 1972-05-15 1973-09-11 Allis Chalmers Division head curtain for compartmented grinding mill
WO1988003056A1 (en) * 1986-10-24 1988-05-05 Belgorodsky Tekhnologichesky Institut Stroitelnykh Tubular ball mill
WO1988003055A1 (en) * 1986-10-21 1988-05-05 Belgorodsky Tekhnologichesky Institut Stroitelnykh Tubular ball mill
WO1988005341A1 (en) * 1987-01-23 1988-07-28 Belgorodsky Tekhnologichesky Institut Stroitelnykh Tube ball mill
CN103170394A (zh) * 2013-03-08 2013-06-26 姜其斌 一种超细粉煤灰专用磨机
CN105233926A (zh) * 2015-09-22 2016-01-13 宁夏锦绣实业有限公司 超细粉煤灰专用磨
CN109499698A (zh) * 2017-09-15 2019-03-22 南京麒麟科学仪器集团有限公司 搅拌磨快速研磨方法
CN112337582A (zh) * 2020-11-09 2021-02-09 常州市龙鑫智能装备有限公司 具有粗细研磨的一体式砂磨机
US20220088608A1 (en) * 2020-09-22 2022-03-24 Divergent Technologies, Inc. Methods and apparatuses for ball milling to produce powder for additive manufacturing

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
RU2190474C2 (ru) * 2001-01-12 2002-10-10 Открытое акционерное общество "ТЯЖМАШ" Мельница шаровая

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE467522C (de) * 1928-10-26 Eisengiesserei UEbertragungsvorrichtung in Verbundmuehlen
US3144212A (en) * 1961-10-31 1964-08-11 Allis Chalmers Mfg Co Combination rod and ball grinding mill

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE467522C (de) * 1928-10-26 Eisengiesserei UEbertragungsvorrichtung in Verbundmuehlen
US3144212A (en) * 1961-10-31 1964-08-11 Allis Chalmers Mfg Co Combination rod and ball grinding mill

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3758041A (en) * 1972-05-15 1973-09-11 Allis Chalmers Division head curtain for compartmented grinding mill
WO1988003055A1 (en) * 1986-10-21 1988-05-05 Belgorodsky Tekhnologichesky Institut Stroitelnykh Tubular ball mill
WO1988003056A1 (en) * 1986-10-24 1988-05-05 Belgorodsky Tekhnologichesky Institut Stroitelnykh Tubular ball mill
WO1988005341A1 (en) * 1987-01-23 1988-07-28 Belgorodsky Tekhnologichesky Institut Stroitelnykh Tube ball mill
CN103170394A (zh) * 2013-03-08 2013-06-26 姜其斌 一种超细粉煤灰专用磨机
CN105233926A (zh) * 2015-09-22 2016-01-13 宁夏锦绣实业有限公司 超细粉煤灰专用磨
CN109499698A (zh) * 2017-09-15 2019-03-22 南京麒麟科学仪器集团有限公司 搅拌磨快速研磨方法
US20220088608A1 (en) * 2020-09-22 2022-03-24 Divergent Technologies, Inc. Methods and apparatuses for ball milling to produce powder for additive manufacturing
US12103008B2 (en) * 2020-09-22 2024-10-01 Divergent Technologies, Inc. Methods and apparatuses for ball milling to produce powder for additive manufacturing
CN112337582A (zh) * 2020-11-09 2021-02-09 常州市龙鑫智能装备有限公司 具有粗细研磨的一体式砂磨机

Also Published As

Publication number Publication date
GB1265637A (enrdf_load_stackoverflow) 1972-03-01
FR2073576A5 (fr) 1971-10-01
ES198759Y (es) 1975-11-16
ZA708149B (en) 1972-07-26
DE2061214A1 (de) 1972-03-16
ES198759U (es) 1975-06-16
CA934724A (en) 1973-10-02

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Legal Events

Date Code Title Description
AS Assignment

Owner name: WOODS KATHLEEN D., AS TRUSTEE

Free format text: SECURITY INTEREST;ASSIGNOR:ALLIS-CHALMERS CORPORATION A DE CORP.;REEL/FRAME:004149/0001

Effective date: 19830329

Owner name: CONNECTICUT NATIONAL BANK THE, A NATIONAL BANKING

Free format text: SECURITY INTEREST;ASSIGNOR:ALLIS-CHALMERS CORPORATION A DE CORP.;REEL/FRAME:004149/0001

Effective date: 19830329