US3894696A - Device at grate means mounted in a mill or another processing apparatus - Google Patents

Device at grate means mounted in a mill or another processing apparatus Download PDF

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Publication number
US3894696A
US3894696A US381201A US38120173A US3894696A US 3894696 A US3894696 A US 3894696A US 381201 A US381201 A US 381201A US 38120173 A US38120173 A US 38120173A US 3894696 A US3894696 A US 3894696A
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US
United States
Prior art keywords
sector
radially extending
rigid
grate
bars
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Expired - Lifetime
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US381201A
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English (en)
Inventor
Elis Jonsson
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Skega AB
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Skega AB
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Publication date
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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
    • B02C17/183—Feeding or discharging devices
    • B02C17/1835—Discharging devices combined with sorting or separating of material
    • B02C17/1855—Discharging devices combined with sorting or separating of material with separator defining termination of crushing zone, e.g. screen denying egress of oversize material

Definitions

  • ABSTRACT A screening device for a grinding mill comprising a plurality of radially extending elastic polymeric sectors having openings therein together with a plurality of clamping members for clamping the radially extending edges of said sectors to a portion of the grinding mill framework, and sector support means disposed between each sector and the portion of the mill frame work to which the sector is attached by said clamping means, each sector support means being composed of rigid material and being constructed of a pair of radially extending rigid bars adapted to fit under the radially extending edges of a sector and a plurality of rigid cross bars extending between said pair of radially extending rigid bars, whereby each sector support means will support an elastic polymeric sector across the area between its radially extending edges and thereby decrease the tendency of the sector to bulge.
  • Grate means of this kind for mills and other mineral processing apparatus were for many years manufactured exclusively of steel in the form of plates with throughput apertures. It was first in conjunction with the development of rubber lining in mills that experiments were started to manufacture also the grate means of the same material as the linings. At first these grate means were built up about a steel structure, which was vulcanized into the rubber, but rather soon an abnormally heavy wear was observed just above the vulcanized reinforcement. The reason thereof was found to be the fact that rubber is worn much more rapidly when it is applied in such a rigid manner that its elasticity cannot be fully utilized for taking up energy from the wearing material.
  • the present invention therefore, has as its object to eliminate above all the disadvantages involved with the known rubber grate means and to render possible the use of a grate means comprising plates of a polymer material without steel reinforcement so as to be able to utilize the elasticity of the polymer material and other advantages thereof, e.g. with respect to clogging.
  • This object is achieved in that the device according to the invention shows the characterizing features defined in the claims.
  • FIG. 1 shows a perspective view of a grate means arranged according to the invention for a relatively small ball mill, certain parts comprised in the grate means being moved apart and other parts being removed for the sake of clarity.
  • FIG. 2 shows a section along the line 11-]! in FIG. 1,
  • FIG. 3 shows a plane view ofa supporting frame comprised in the device according to the invention for a grate means of a larger type than that shown in FIG. 1,
  • FIG. 4 shows a plane view of a portion of a grate means, the supporting frame shown in FIG. 3 mounted in place, and
  • FIG. 5 shows a section along the line V-V in FIG. 4.
  • I designates a grate means assembled of a plurality of plates 2 consisting of a polymer material without steel reinforcement. These plates 2 are clamped in a manner known per se against radially arranged supporting surfaces 3 by means of lifters 5 provided on the discharge side of the grate means. Each one of said lifters 5 overlaps two adjacent plates 2 and is provided with a longitudinal recess 12 for receiving a fastening rib 13 having bolts 14 for the performance of the clamping. Said supporting surfaces 3 are connected to grate discharge means 4 on the discharge side of the grate means. According to the invention, below each grate plate 2 a supporting frame 6 of e.g. steel or another equivalent material is mounted.
  • each such frame is supported by two adjacent supporting surfaces 3 and retained in position by the grate plate 2 mounted thereabove, without any connection between the same relative one another.
  • each grate plate 2 is to be placed loosely on the supporting frame 6 therebelow and then being clamped in pairs, in position on the frame 6, i.e. on the frame members 7, together with said frame 6 and the lifters by tightening the bolts 14.
  • the supporting frame 6 for a plate comprises two longitudinal supporting bars 7 adapted to lie below the longitudinal edge portions of a plate and entirely to the side of fields of throughput apertures of the plate marked schematically in FIGS. 1 and 4 by rectangular squares 8 in order not to obstruct the throughput of ground material.
  • the two supporting bars 7 are inter connected by means of narrow cross-bars 9, the surface 10 of which lies in the same plane as the surface of the supporting bars facing the plate, and which are adapted to support the grate plate between the supporting bars in order to prevent them from deflecting.
  • the number of such cross-bars may vary from one case to the other, depending on the length and tapering degree of the grate plates.
  • supporting frames are shown which are provided with three crossbars though both a greater and smaller number may be used while the supporting frame shown in other FIGS. and intended for a larger grate plate 2 mounted against a transverse lifter 11 (see particularly FIGS. 4 and 5) has four such cross-bars.
  • the last-mentioned supporting frame differs from that shown in FIGS. 1 and 2 by its supporting bars having the form of angular irons instead of flat irons.
  • a grate means which lies plane and does not show any tendency of bulging, at the same time as the flexibility of the polymer material is maintained so that the grate means is worn uniformly over its entire surface and a heavy local wear as in the case of grate means with vulcanized steel reinforcement is avoided.
  • the supporting frame somewhat shorter than the plate proper, it is possible to adjust the plate in radial direction so as not to cover any throughput aperture.
  • screening device which is adapted to be disposed transversely across the longitudinal axis of a grinding mill and which screening device comprises a plurality of radially extending elastic poly-, Y
  • each sector support means will support an elastic polymeric sector across the area between its radially extending edges and thereby decrease the tendency of the sector to bulge.

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  • Engineering & Computer Science (AREA)
  • Food Science & Technology (AREA)
  • Crushing And Grinding (AREA)
  • Combined Means For Separation Of Solids (AREA)
  • Disintegrating Or Milling (AREA)
  • Road Paving Structures (AREA)
US381201A 1972-08-02 1973-07-20 Device at grate means mounted in a mill or another processing apparatus Expired - Lifetime US3894696A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
SE1006372 1972-08-02

Publications (1)

Publication Number Publication Date
US3894696A true US3894696A (en) 1975-07-15

Family

ID=20291611

Family Applications (1)

Application Number Title Priority Date Filing Date
US381201A Expired - Lifetime US3894696A (en) 1972-08-02 1973-07-20 Device at grate means mounted in a mill or another processing apparatus

Country Status (7)

Country Link
US (1) US3894696A (OSRAM)
JP (1) JPS5730547B2 (OSRAM)
AU (1) AU471440B2 (OSRAM)
DE (1) DE2339058A1 (OSRAM)
IT (1) IT991933B (OSRAM)
YU (1) YU34851B (OSRAM)
ZA (1) ZA735120B (OSRAM)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6663030B2 (en) * 2002-03-21 2003-12-16 Jeffrey H. Washburn Replaceable grate device for maximizing the throughput of solid material in ore mills
WO2021136864A1 (en) * 2019-12-30 2021-07-08 Metso Outotec Finland Oy Grate panel, grate panel support element, arrangement at grinding mill discharge end and method for disassembling discharge end of grinding mill
WO2022157741A1 (en) * 2021-01-25 2022-07-28 Flsmidth A/S Mill discharge grate having dynamic variable sieve openings

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH04122928U (ja) * 1991-04-10 1992-11-05 株式会社タクマ 焼却炉の焼却物供給装置
CA2106226C (en) * 1992-09-22 1997-08-12 Vladimir Georgievich Kochnev Mill device
CN112958231B (zh) * 2021-02-26 2025-01-03 佛山市恒力泰科技有限公司 球磨机出料端结构及球磨机滚筒

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2405633A (en) * 1943-01-13 1946-08-13 Phelps Dodge Corp Grinding mill
US3211387A (en) * 1962-09-17 1965-10-12 Koppers Co Inc Grinding mill lining and control of the wear thereof
US3219284A (en) * 1962-06-15 1965-11-23 Bolidens Gruv Ab Screening device in a rotatable drum intended for grinding and/or mixing material
US3599882A (en) * 1970-01-08 1971-08-17 Allis Chalmers Mfg Co Discharge diaphragm assembly for grinding mill or the like
US3604637A (en) * 1969-10-29 1971-09-14 Allis Chalmers Mfg Co End liner assembly for rotary mill or the like
US3604639A (en) * 1970-04-01 1971-09-14 Allis Chalmers Mfg Co Trunnion liner assembly for rotary grinding mill or the like

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL6406811A (OSRAM) * 1963-06-18 1964-12-21

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2405633A (en) * 1943-01-13 1946-08-13 Phelps Dodge Corp Grinding mill
US3219284A (en) * 1962-06-15 1965-11-23 Bolidens Gruv Ab Screening device in a rotatable drum intended for grinding and/or mixing material
US3211387A (en) * 1962-09-17 1965-10-12 Koppers Co Inc Grinding mill lining and control of the wear thereof
US3604637A (en) * 1969-10-29 1971-09-14 Allis Chalmers Mfg Co End liner assembly for rotary mill or the like
US3599882A (en) * 1970-01-08 1971-08-17 Allis Chalmers Mfg Co Discharge diaphragm assembly for grinding mill or the like
US3604639A (en) * 1970-04-01 1971-09-14 Allis Chalmers Mfg Co Trunnion liner assembly for rotary grinding mill or the like

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6663030B2 (en) * 2002-03-21 2003-12-16 Jeffrey H. Washburn Replaceable grate device for maximizing the throughput of solid material in ore mills
WO2021136864A1 (en) * 2019-12-30 2021-07-08 Metso Outotec Finland Oy Grate panel, grate panel support element, arrangement at grinding mill discharge end and method for disassembling discharge end of grinding mill
CN113117870A (zh) * 2019-12-30 2021-07-16 奥图泰(芬兰)公司 篦板及其支撑元件、研磨机出料端处的装置及其拆卸方法
CN113117870B (zh) * 2019-12-30 2024-05-28 美卓奥图泰芬兰有限公司 篦板及其支撑元件、研磨机出料端处的装置及其拆卸方法
WO2022157741A1 (en) * 2021-01-25 2022-07-28 Flsmidth A/S Mill discharge grate having dynamic variable sieve openings
AU2022210883B2 (en) * 2021-01-25 2024-05-02 Flsmidth A/S Mill discharge grate having dynamic variable sieve openings
US20240316567A1 (en) * 2021-01-25 2024-09-26 Flsmidth A/S Mill discharge grate having dynamic variable sieve openings
AU2022210883A9 (en) * 2021-01-25 2025-03-20 Flsmidth A/S Mill discharge grate having dynamic variable sieve openings

Also Published As

Publication number Publication date
YU34851B (en) 1980-04-30
AU471440B2 (en) 1976-04-29
YU207473A (en) 1979-10-31
ZA735120B (en) 1974-07-31
IT991933B (it) 1975-08-30
JPS49132655A (OSRAM) 1974-12-19
AU5859473A (en) 1975-01-30
DE2339058A1 (de) 1974-02-14
JPS5730547B2 (OSRAM) 1982-06-29

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