US3637147A - Lifting members in wear lining for rotary drums - Google Patents

Lifting members in wear lining for rotary drums Download PDF

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Publication number
US3637147A
US3637147A US865390A US3637147DA US3637147A US 3637147 A US3637147 A US 3637147A US 865390 A US865390 A US 865390A US 3637147D A US3637147D A US 3637147DA US 3637147 A US3637147 A US 3637147A
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United States
Prior art keywords
lifting
drum
generatrix
lifting members
wear
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Expired - Lifetime
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US865390A
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English (en)
Inventor
Robert Gerhard Franz Jo Naredi
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.)
Cementa AB
Skega AB
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Cementa AB
Skega AB
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Filing date
Publication date
Application filed by Cementa AB, Skega AB filed Critical Cementa AB
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Publication of US3637147A publication Critical patent/US3637147A/en
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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

  • ABSTRACT This invention relates to lifting members for the wear lining of [30] Foreign Application Priority Dam rotary drums employed in particle comminuting and sorting apparatus, such as mills, the members being placed in spaced relationship alongside of each other. Separate wear protecting Oct. 1l,l968 Sweden................................l3730/68 elements are supported between each pair of lifting members,
  • each lifting member and the associated wear protecting elements are mounted along generatrices of the drum, i.e., the center line of each lifting member coincides with a drum generatrix.
  • the lining may also be constructed or bar-shaped units placed side by side and held at the ends by clamping rings secured on the shell by screws. Said bar-shaped units may be placed so as to deviate from the generatrix and thereby form a so-called helical lining. This brings about a sizing effect on the charge, in such a way that grinding elements of greater dimension accumulate at the inlet end wall where the material to be ground is fed into the mill, and the worn grinding elements are collected at the outlet end wall where the milling produce is finely ground.
  • the sizing effect hereby results in an increase of grinding capacity.
  • a sizing effect is also obtained by the use of sectional plates according to U.S. Pat. No. 2,809,789.
  • the sizing effect rapidly ceases and the plates in their entirety must be exchanged. Such an exchange is uneconomic, because thereby a great portion of the lining is turned into scrap.
  • a corresponding sizing effect can be obtained by shell plates and separate lifters, if the latter are screwed into rows of holes deviating from the shell generatrices.
  • the holes thus, are to be drilled along helical lines deviating from said generatrices.
  • it can be impossible in many cases, for strength reasons, to drill new rows of holes along helical lines.
  • every wear lining of steel depending on different deviations from the generatrix and on varying mill diameters, must then be specially manufactured in forms rendering the correct helical shape for obtaining good abutment to the shell.
  • the plates and lifting members can be designed for being clamped along generatrices and yet be clamped to form a helix, because the members are elastomeric and deform when being mounted.
  • the present invention has as its object to overcome the disadvantage that hole rows are to be drilled in the shell along helical lines, in order to avoid any reduction in the strength of the shell.
  • existing hole rows are utilized even if one desires to vary the helix angle.
  • the lifting members according to the invention substantially are characterized in that the lifting portion of the lifting member, i.e., that portion which meets the material being ground and which comprises at least one side surface, so deviates from the generatrix that every surface of the lifting portion, at that end of the side surface which is located closest to the outlet end is nearer the centerline of the lifting member than at the inlet end of the drum.
  • the wear protection may comprise on single plate, or several plates arranged one after the other, or several bar-shaped units placed side by side, or suitable combinations thereof, and it may be made of any suitable material, for example rubber or steel.
  • the mounting of the wear lining can be carried out in any suitable way, for example such as described in U.S. Pat. No. 3,107,867.
  • the lifting members preferably are manufactured separately.
  • those surfaces of the lifting members which face to the center of the drum preferably taper towards the outlet end of the drum with an angle deviating from the generatrix by up to
  • the deviation of one side surface of the lifting members preferably should be l.5-2.0
  • the effect will be improved by slight increase of the angle.
  • an angle deviation of l0-l5 is used. The aforesaid deviations were fbund to apply to numbers of revolutions usually applied (65-80 percent of the critical number of revolutions).
  • FIG. I shows a view seen from above of a lifting member according to the invention
  • FIG. 2 shows the same lifting member in a section along the line Il-II in FIG. ll,
  • FIG. 3 shows a view seen from above of a second embodiment of the invention, the invention
  • FIG. 4 shows a view seen from above of a third embodiment of the invention.
  • FIG. 5 shows an application of the invention in a grate discharge mill.
  • FIGS. I and 2 show a lifting member 1 which, seen from above, has a rectangular longitudinal shape.
  • the lifting member is mounted along the shell generatn'x by means of suitable fastening means (not shown) possibly through each of the three holes 2 located along the lifting member centerline 6 coinciding with a generatrix.
  • the lifting member holds the wear protecting elements 3 in such a manner, that the lifting member is embedded in recesses in edge portions of the wear protecting elements.
  • the side surface 4 is the lifting side surface, and this side surface deviates from the generatrix of shell 7.
  • the portion located above the wear protection thus, tapers towards the outlet end of the drum.
  • the angle deviation in this case is about 2.
  • the lifter can be given a rounded top surface.
  • FIG. 3 shows a view of a second embodiment of a lifting member according to the invention. It differs from the embodiment in FIGS. I. and 2 only in that both side surfaces 8 and 9 of the lifting member which are located above the wear protection deviate from the shell generatrix.
  • the centerline 6 of the lifting member coincides with a generatrix.
  • FIG. 4 shows a third embodiment of the invention according to which the lifting side 10 of the lifting member deviates from the generatrix by an, angular tooth shape which allows for a greater number of deviation degrees from the generatrix.
  • FIG. 5 shows how the lifting members I according to the invention can be built into a grate discharge mill II with inlet 12 and outlet 13.
  • the drum is provided with lifting members I and wear protecting elements 3 along the greater part of the inner shell surface.
  • a grate I5 is mounted, the perforations of which determine the maximum grain size of the ground product.
  • the mill is charged with the material to be ground and with grinding elements.
  • Every section may comprise either only lifting members according to the'invention, or a combination of lifting members according to the invention and of conventional lifting members.
  • the lifting side of the lifting member 16 with the lifting side surface 17 faces to the opposite direction, so that the (worn) grinding elements of smaller dimensions which have caused the clogging of the grate are lifted back, and only the grinding elements of somewhat greater dimensions which are too large for clogging the grate are allowed to be active at the grate.
  • the critical" grinding elements of smaller dimensions are thereby subjected to an additional wear or preferably are worn completely so as to have the same grain size as the pulp in general. These elements are then combined with the pulp and pass together with the pulp through the grate. The result is a considerably reduced clogging of the grate. If the grinding elements are of a grain size exceeding that of the pulp grains, this will increase the wear in pumps, pipes and classifiers.
  • a rotary drum ofa comminuting mill or the like the improvement which comprises a plurality of elongate lifting members secured in generally side-by-side relationship along the interior surface of the drum, each said lifting member lying with its longitudinal axis along a generatrix of the cylindrical interior surface of the drum,
  • each said lifting element having one side surface which acts as the lifting surface during drum rotation and which is, over at least a portion of its length, disposed to form an acute angle to said longitudinal axis and thus also to the respective generatrix along which the respective lifting element lies whereby said one side surface lies toward the drum outlet end closer to said longitudinal axis than at the inlet end ofthe drum.

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  • Engineering & Computer Science (AREA)
  • Food Science & Technology (AREA)
  • Crushing And Grinding (AREA)
  • Grinding Of Cylindrical And Plane Surfaces (AREA)
US865390A 1968-10-11 1969-10-10 Lifting members in wear lining for rotary drums Expired - Lifetime US3637147A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
SE1373068 1968-10-11

Publications (1)

Publication Number Publication Date
US3637147A true US3637147A (en) 1972-01-25

Family

ID=20297892

Family Applications (1)

Application Number Title Priority Date Filing Date
US865390A Expired - Lifetime US3637147A (en) 1968-10-11 1969-10-10 Lifting members in wear lining for rotary drums

Country Status (6)

Country Link
US (1) US3637147A (enrdf_load_stackoverflow)
DE (1) DE1951235C3 (enrdf_load_stackoverflow)
FI (1) FI52284C (enrdf_load_stackoverflow)
FR (1) FR2020440A1 (enrdf_load_stackoverflow)
GB (1) GB1288083A (enrdf_load_stackoverflow)
NO (1) NO131573C (enrdf_load_stackoverflow)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5472148A (en) * 1992-01-10 1995-12-05 Envirotech Pumpsystems, Inc. Grinding mill, lining and associated method of manufacture

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FI118525B (fi) * 2006-05-31 2007-12-14 Metso Powdermet Oy Menetelmä monimateriaalikomponentin tai -rakenteen valmistamiseksi

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1309210A (en) * 1919-07-08 Roller-mill
US1541114A (en) * 1924-02-23 1925-06-09 Charles L Carman Ball or pebble mill
US2611546A (en) * 1949-11-15 1952-09-23 Kensington Steel Company Liner construction for grinding mills
US2809789A (en) * 1953-12-29 1957-10-15 Allis Chalmers Mfg Co Ball mill liner
US2876957A (en) * 1954-10-23 1959-03-10 Henricot Usines Emile Sa Ribbed frusto-conical lining for tube mills
US3467321A (en) * 1966-06-20 1969-09-16 Vladimir Vasilievich Tkachev Sorting armored linings for tube mills

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1985801A (en) * 1932-09-19 1934-12-25 Sheehan Joseph Ball or tube mill
BE527136A (enrdf_load_stackoverflow) * 1953-03-10
DE1131489B (de) * 1959-10-31 1962-06-14 Kloeckner Werke Ag Sortierpanzerplatten fuer Rohrmuehlen

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1309210A (en) * 1919-07-08 Roller-mill
US1541114A (en) * 1924-02-23 1925-06-09 Charles L Carman Ball or pebble mill
US2611546A (en) * 1949-11-15 1952-09-23 Kensington Steel Company Liner construction for grinding mills
US2809789A (en) * 1953-12-29 1957-10-15 Allis Chalmers Mfg Co Ball mill liner
US2876957A (en) * 1954-10-23 1959-03-10 Henricot Usines Emile Sa Ribbed frusto-conical lining for tube mills
US3467321A (en) * 1966-06-20 1969-09-16 Vladimir Vasilievich Tkachev Sorting armored linings for tube mills

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5472148A (en) * 1992-01-10 1995-12-05 Envirotech Pumpsystems, Inc. Grinding mill, lining and associated method of manufacture

Also Published As

Publication number Publication date
DE1951235A1 (de) 1970-04-16
FI52284C (fi) 1977-08-10
DE1951235C3 (de) 1974-10-17
FR2020440A1 (enrdf_load_stackoverflow) 1970-07-10
GB1288083A (enrdf_load_stackoverflow) 1972-09-06
DE1951235B2 (de) 1974-03-21
FI52284B (enrdf_load_stackoverflow) 1977-05-02
NO131573C (enrdf_load_stackoverflow) 1975-06-25
NO131573B (enrdf_load_stackoverflow) 1975-03-17

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