US3589625A - Grinding mill - Google Patents

Grinding mill Download PDF

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Publication number
US3589625A
US3589625A US770025A US3589625DA US3589625A US 3589625 A US3589625 A US 3589625A US 770025 A US770025 A US 770025A US 3589625D A US3589625D A US 3589625DA US 3589625 A US3589625 A US 3589625A
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US
United States
Prior art keywords
plate
chamber
track
grinding mill
rollers
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
Application number
US770025A
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English (en)
Inventor
Jean Desbordes
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.)
Stein and Roubaix SA
Original Assignee
Stein and Roubaix SA
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Stein and Roubaix SA filed Critical Stein and Roubaix SA
Application granted granted Critical
Publication of US3589625A publication Critical patent/US3589625A/en
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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
    • B02C15/00—Disintegrating by milling members in the form of rollers or balls co-operating with rings or discs
    • B02C15/02—Centrifugal pendulum-type mills

Definitions

  • a grinding mill comprises a grinding chamber at the bottom of which a rotatable plate is supported.
  • the plate carries pivotable rollers which are urged against a rolling track fixed in the chamber at a higher level than the plate.
  • An air distributor encircles the chamber at the level of the plate and has air inlets for producing an airflow in the chamber which conveys the ground material upwardly in an axial central re gion of the chamber for external discharge at the top thereof.
  • the plate is driven in rotation from below so that the entire region of the chamber above the center of the plate is completely open.
  • the present invention relates to grinding mills having rollers which are pivotable in such manner that they can be applied against a rolling track by centrifugal force.
  • the grinding mills ofthis type heretofore proposed are pendular-body mills in which the rollers are suspended from a plate driven by a vertical shaft disposed on the axis of the mill.
  • the product to be ground is introduced through a lateral chute, while an air vortex transverse the mill from bottom to top between the rollers and the rolling track, stirring in this way the product in the process of being ground and entraining the ground grains into a selector or separator at the top which allows only those particles which have attained the required fineness to pass; the other particles drop back by gravity to the bottom of the grinding mill, where they are picked up by blades driven rotatively at the same time as the pendular plate, to be subjected anew to the action of the rollers.
  • the shaft and the pendular plate occupy a considerable space in the center of the grinding mill, they prevent axial feed of the product, which may, however, prove to be useful, in particular for facilitating uniform distribution. Furthermore, the assembly consisting of the shaft and the pendular plate interferes with the flow of the air at the outlet of the mill, causing a considerable loss of pressure and promoting congestion of the mill.
  • the upper bearing located at a great distance from the lower bearing undergoes intense dynamic stresses which may result from a balancing defect of the movable assembly and/or from an ovalization of the rolling track as the result of irregular wear and and of the differential action of the rollers due to the heterogeneousness of the materials to be ground or to the irregularity of their distribution.
  • An object of the present invention is to remedy these drawbacks.
  • a grinding mill according to the invention is characterized by the fact that the rollers are supported from a plate disposed at the bottom of said grinding mill.
  • the rollers which can turn on their own axis, are carried directly by the plate, being articulated thereto in such manner that they can be applied by the centrifugal force against a rolling track at a level above the plate.
  • each roller is supported from the plate through the medium of a stirrup from which it is suspended, the stirrup being articulated to the plate in such manner that it can be applied by the centrifugal force against a rolling track likewise located at a level higher than that of the plate.
  • the length of the shaft serving to drive the plate rotatively is considerably reduced and this results in better behavior under dynamic stresses and does away with the difficulties of lubrication and tightness.
  • the center of the chamber is not obstructed as in the known constructions, so that it is possible to effect axial feed with crude product or to house the separator in the center, i.e., a dynamic separator functioning by a combination of a relaxation of pressure and the centrifugal action, in the grinding chamber itself. In the latter case, the total weight of the installation is considerably reduced and the reduction in height, which lowers the center of gravity, eliminates vibration.
  • P16. 1 is a diagrammatic view in vertical section ofa grinding mill according to the invention.
  • FIG. 2 diagrammatically shows an alternative means for supporting the rollers.
  • the numeral 1 designates a chamber of circular cross section of a grinding mill the base of which is equipped with a volute 2 forming a type of air distributor having tangential inlets because of deflectors 3.
  • the lower portion of the chamber supports a fixed rolling track 4 of highstrength steel.
  • a vertical shaft 5 driven rotatively from a horizontal shaft 6 through the medium ofa reduction gear formed by a pair of bevel gears 7, 7 and incorporated in the apparatus of independent thereof.
  • the vertical shaft 5 rests on an abutment 8 and is guided by bearings 9 and W.
  • the upper end of the shaft 5 is fast with a plate 10 disposed at the bottom of the grinding mill and wholly or partly covering the base thereof.
  • rollers 11 which are adapted for being applied by centrifugal force against the rolling track 4 located at a level higher than that of the plate 10, are supported from plate 10.
  • each roller 11 is rotatable about a central spindle 12 which is articulated to the plate 10 through the mediumof a picot 13 having its axis perpendicular to the diametral plane defined by the shaft 5 and the spindle 12.
  • each roller 11 is rotatable about a spindle 12, one end of which is fast with a stirrup l4! movable rotatively with respect to the plate 10.
  • the stirrup can swing or rock about two coaxial pivots 15 and 15, it being understood that these articulations can be obtained by any other suitable elastic system.
  • the spindles 12 or 12 of the rollers lll may be designed in such manner as to receive supplementary counterweights 16 of variable weight which are intended to modify, at constant driving speed, the pressure exerted by the rollers 11 on the rolling track 43.
  • the crude product is introduced through a chute 17, which may be located laterally or axially, since the center of the grinding mill is unoccupied, Moreover, blades 18, or any other device designated to throw the crude product on to the rolling track 4 for the rollers, may be fast with the plate 10.
  • the rollers 11 are applied by the centrifugal force against the rolling track 4 located above said plate and, while the product to be ground is introduced through the chute 17, an air vortex coming from the volute 2 transverse the mill from bottom to top between the rollers ill and the rolling track 4, stirring up the product in the process of being ground, in conjunction with the blades 18, and entraining the ground grains through the outlet 19 into a selector or separator disposed at the top.
  • the separator allows only those particles which have attained the required fineness to pass; the other particles drop back by gravity to the bottom of the mill. They are picked up by the blades 18 and subjected anew to the action of the rollers.
  • the separator (not shown) could be arranged in the inside of the chamber 1, since the central portion thereof is clear due to the arrangement according to the invention.
  • the possibility of adding the counterweights 16 to modify the pressure exerted by the rollers 11 on the rolling track 4 enables the grinding mill to be adapted to the nature of the product to be ground and to the fineness sought.
  • one or more levels of supplementary rolling tracks such as are shown in dash lines at 4 may be placed above the rolling track 4 and on each of these supplementary tracks there acts a system of rollers supported from the same plate or from different plates.
  • Systems of deflectors such as that shown in dash lines at 20, can be provided to pick up the stream of air charged with the product which has undergone a first grinding at the level 4 and introduce it at the successive levels 4', or further where it undergoes secondary, tertiary, etc. grinding operations.
  • These deflectors 20 may be designed in such manner as to effect a selection of the product between two successive levels. In this way, it is possible to effect, in a single operation, grinding to very high degrees of fineness, while considerably reducing the recycling circuits of the product and greatly increasing the output of the apparatus.
  • a grinding mill comprising a housing defining a grinding chamber having a vertical axis, a rotatable supporting plate in said chamber at the bottom thereof, a rolling track fixed in said housing at a level above said plate, rollers pivotably supported on said plate for traveling along said track as the plate rotates and being urged against said track by centrifugal force, means for introducing material to be ground into said chamber at the top thereof so that the material descends in the chamber and is introduced between the roller and track, means for producing an airflow in the chamber which conveys the ground material upwardly in an axial central region of the chamber, for external discharge at the top thereof, the latter said means comprising an air distributor encircling said chamber at the level of the plate, and means for rotating said plate including a shaft coupled to said plate and disposed in entirety thercbeneath for being driven in rotation from below said plate while leaving the entire region above the plate completely open.
  • a grinding mill as claimed in claim I wherein said air distributor comprises a volute having tangential air inlets into said chamber.
  • a grinding mill as claimed in claim 1 comprising means rotatably supporting each roller and pivotably connected to said plate.
  • each roller comprises a stirrup rotatable with said plate and having two arms each pivotably supported on said plate, and a support shaft fixed to said stirrup between said arms, said rollers each being mounted on a support shaft of a respective stirrup.
  • a grinding mill as claimed in claim 1 comprising at least one further track fixed in said housing at a level above the first said track, and further rollers for each track.

Landscapes

  • Engineering & Computer Science (AREA)
  • Food Science & Technology (AREA)
  • Crushing And Grinding (AREA)
US770025A 1967-10-25 1968-10-23 Grinding mill Expired - Lifetime US3589625A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR125838 1967-10-25

Publications (1)

Publication Number Publication Date
US3589625A true US3589625A (en) 1971-06-29

Family

ID=8640720

Family Applications (1)

Application Number Title Priority Date Filing Date
US770025A Expired - Lifetime US3589625A (en) 1967-10-25 1968-10-23 Grinding mill

Country Status (6)

Country Link
US (1) US3589625A (de)
BE (1) BE721995A (de)
DE (2) DE1804744A1 (de)
ES (1) ES358851A1 (de)
FR (1) FR1548595A (de)
GB (1) GB1242887A (de)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103657795A (zh) * 2014-01-09 2014-03-26 郑州维科重工机械有限公司 用于辊磨机的直驱式主结构
US9073055B1 (en) 2013-03-06 2015-07-07 Unifine Mill LLC Systems and methods for milling flour
US20150217297A1 (en) * 2012-08-17 2015-08-06 Hunan Zhonghong Heavy Machinery Co., Ltd. Hammer wheel mechanism capable of adjusting grinding force for annular roller type upright mill

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2726378A1 (de) * 1977-06-10 1978-12-14 Indutec Industrietechnik Gmbh Fliehkraft-rollenmuehle

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1589302A (en) * 1924-08-21 1926-06-15 Smidth & Co As F L Grinding mill
US3337142A (en) * 1964-08-03 1967-08-22 Williams Patent Crusher & Pulv Roller grinding mill and control therefor

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1589302A (en) * 1924-08-21 1926-06-15 Smidth & Co As F L Grinding mill
US3337142A (en) * 1964-08-03 1967-08-22 Williams Patent Crusher & Pulv Roller grinding mill and control therefor

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20150217297A1 (en) * 2012-08-17 2015-08-06 Hunan Zhonghong Heavy Machinery Co., Ltd. Hammer wheel mechanism capable of adjusting grinding force for annular roller type upright mill
US9073055B1 (en) 2013-03-06 2015-07-07 Unifine Mill LLC Systems and methods for milling flour
CN103657795A (zh) * 2014-01-09 2014-03-26 郑州维科重工机械有限公司 用于辊磨机的直驱式主结构

Also Published As

Publication number Publication date
DE1804744A1 (de) 1972-01-13
ES358851A1 (es) 1970-05-16
FR1548595A (de) 1968-12-06
GB1242887A (en) 1971-08-18
BE721995A (de) 1969-04-08
DE6803563U (de) 1973-07-05

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