EP0500509A1 - Procédé pour la propulsion d'un moulin et moulin pour l'exécution du procédé - Google Patents

Procédé pour la propulsion d'un moulin et moulin pour l'exécution du procédé Download PDF

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Publication number
EP0500509A1
EP0500509A1 EP92850020A EP92850020A EP0500509A1 EP 0500509 A1 EP0500509 A1 EP 0500509A1 EP 92850020 A EP92850020 A EP 92850020A EP 92850020 A EP92850020 A EP 92850020A EP 0500509 A1 EP0500509 A1 EP 0500509A1
Authority
EP
European Patent Office
Prior art keywords
mill
discharge
trunnion
discharge trunnion
wall
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.)
Withdrawn
Application number
EP92850020A
Other languages
German (de)
English (en)
Inventor
Jan Odd Bogen
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.)
Metso Minerals Sala AB
Original Assignee
Sala International AB
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 Sala International AB filed Critical Sala International AB
Publication of EP0500509A1 publication Critical patent/EP0500509A1/fr
Withdrawn legal-status Critical Current

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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
    • B02C17/24—Driving mechanisms

Definitions

  • the present invention relates to a method of operating a mill of the kind comprising a mill body having side walls and a hollow discharge trunnion arranged externally of one side wall, and in which the mill body is rotated by means of a substantially horizontal shaft which is common to both the mill body and the discharge trunnion.
  • the invention also relates to a mill which includes two end walls which ex-tend generally perpendicular to their rotational axes and through which material to be ground, i.e. the mill burden, is introduced to and discharged from the mill respectively, a cylindrical mill casing which is supported between said end walls and mechanically connected thereto, and a mill burden discharge trunnion which is connected to and faces outwardly from the end-wall through which the mill burden is discharged.
  • Mills are used for grinding material that has an initial particle or lump size of from 5-40 mm, down to varying product sizes. Such mills are used at present within different fields, such as within the mining, cement, lime and porcelain industry, and also within the chemical industry.
  • journal mills in which the mill body is supported on journal bearings consisting of roller or plain journal bearings
  • the mill is rotated by motors which, via gears and couplings, transmit the requisite power to the mill body through the medium of gear drives and gear rings arranged externally of the mill body.
  • rolling mills the mill is rotated by motors which drive rollers that transmit the requisite power to the mill body by frictional drive means.
  • the rollers function both as mill support means and mill drive means.
  • Rolling mills are preferred in many instances, because they can be readily installed and because the investment and maintenance costs involved are low and because the mills can be easily used.
  • Hybrid forms of the two main groups of mill are also available, for instance mills which are driven by gear drives and which rest on non-driven rollers, and tube mills which, as described in EP-A-184 326, comprise non-driven rollers and a drive shaft.
  • mills which are based on grinding or attrition of the burden by vibration instead of rotation, these mills being emptied by means of non-driven rollers, as described in CH-A-383 735.
  • a switch to metal wheels would permit the permitted load on each wheel to be increased by 30-50 times, while simultaneously providing a roller resistance which is about 15% lower.
  • a problem resides in the greatly impaired possibility of driving the mill via the wheels, and consequently such wheels or rollers can only be used to support the mill body while rotation of said body must be effected in a conventional manner with the aid of a gear drive and gear rings.
  • the object of the present invention is to provide a novel mill operating method and also to provide novel mills in which the drawbacks mentioned in the introduction are substantially eliminated and which will fulfil to a great extent the majority of the desiderata expressed commercially with respect to technical development of such mills and the manner in which they are operated.
  • inventive method is characterized by the steps set forth in the following Claim 1, and the inventive mill is characterized by the features set forth in the following Claims 2-5.
  • the inventive method involves causing the mill body to rest on at least two supports which are arranged in a manner such as to support the entire mill.
  • the mill is rotated by means of a hydraulic motor which is connected mechanically to the burden discharge trunnion and the rotational axle of which is common with the axle of the discharge trunnion and the mill axle.
  • the drive means used is a hydraulic motor, which is mounted either directly on the discharge trunnion or on a shaft or the like which is connected axially to the trunnion, optionally via a gear arrangement.
  • hydraulic motors are commercially available in sizes and in power outputs which are sufficient to drive mills of the size necessary for industrial use. Hydraulic power is obtained by oil or an oil-water mixture under pressure, this pressure being maintained by rotary pumps. Hydraulic power has the advantage that the space required for power transmission is much smaller than the space required for conventional drive systems. Consequently, a hydraulic motor which is sufficiently strong to operate large and heavy mills with a full load of burden is much easier to control and to handle than corresponding electric motors.
  • Hydraulic motors suitable for such mill operating conditions are retailed under the trade name Marathon by Hägglunds Deni- son Drives AB, Mellansel, Sweden.
  • the mill body rests on at least two supports. It is proposed in this respect that the mill is supported on supports in the form of metal rollers or wheels, for instance made of nodular iron.
  • each support will preferably comprise two rollers or two wheels.
  • the rollers or wheels are preferably spaced apart at a distance which is smaller than the diameter of the mill and greater than their own diameters. A suitable roller spacing can be calculated on the basis of the rollers and on that part of the mill which rolls on said rollers, so as to obtain a desired pressure between rollers and mill.
  • each support may, of course, sometimes be appropriate for each support to comprise more than two rollers or wheels, for instance in the case of extremely heavy or large mills.
  • the inventive method prefers that the friction generated between supports and mill is as low as possible, and consequently the rollers or wheels are chosen with an appropriate surface to this end and with the smallest possible intrinsic roller resistance.
  • the supports may have the form of static slide surfaces against which corresponding slide surfaces on the mill move. These slide surfaces may be lubricated so as to reduce the frictional forces generated therebetween, or may have the form of hydrostatic plain bearings.
  • the inventive mill has provided at each end-wall thereof a support ring which has an outwardly-facing contact surface and which is essentially parallel with the rotational axis.
  • This support ring is either an integral part of the actual end-wall itself or is fixedly mounted thereto.
  • the contact surface of said ring is intended to rest against the support, so that the mill will be carried by the support and so that the smallest possible frictional forces are generated between support and support ring as the mill rotates.
  • the contact surface is chosen either for use in combination with metal support rollers or wheels, or in combination with supports in the form of slide surfaces.
  • the discharge end-wall and burden discharge trunnion of the mill are constructed to transmit the necessary torque from the discharge trunnion.
  • the discharge trunnion is arranged for connection to the hydraulic motor by means of which the mill is rotated.
  • the free end of the discharge trunnion is suitable provided with means for connecting said trunnion to the hydraulic motor which functions to rotate the mill, said means having the form of a shaft whose rotational axle is common with the trunnion axle, for instance.
  • Figure 1 is a longitudinal section view of a mill according to a preferred embodiment, illustrating drive means and supports for mill operation in accordance with the inventive method; and Figure 2 shows the same mill from the infeed end thereof.
  • Figure 1 illustrates a mill, generally referenced 10, having two end-walls 11, 12 and a cylindrical mill casing 13 arranged between said end-walls.
  • the inner surface of the mill casing 13 is lined with a lining 14, which protrudes out through the end-walls 11, 12 such as to afford protection to the infeed and outfeed openings provided in respective end-walls.
  • Mounted in each of the end-walls 11, 12 is a respective support ring 15 which extends around the full periphery of its respective end-wall.
  • the support rings 15 rest against supports 16, which may have the form of rotating wheels or rollers or static slide surfaces, although in the case of the Figure 2 embodiment said supports have the form of wheels 16a.
  • the left end-wall 11 of the illustrated embodiment is assumed to be the burden outfeed end-wall, and arranged externally of said wall is a cylindrical burden discharge trunnion 17 which comprises a casing 18 and an end-wall 19.
  • the casing 18 is fixedly connected to the outfeed end-wall 11, as shown at 20.
  • Mounted externally of the end-wall 19 of the trunnion 17 is a hydraulic motor which functions as a drive means 21 and which is connected directly to said trunnion end-wall 19 for transmission of the torque required to rotate the mill.
  • FIG 2 shows the manner in which the mill 10 may be supported when the supports have the form of wheels 16a.
  • the wheels 16a are positioned so that the angle a + ⁇ illustrated in the Figure is the most suitable for operation of the mill concerned, partly with respect to the friction generated between the mill support rings 16and the wheels 16a, and partly with respect to those forces or loads to which the wheels 16a are subjected by the weight of the mill and by rotation of the mill.
  • inventive method steps enable a mill and a mill drive to be constructed which has important advantages over known techniques. Some of these advantages have already been indicated in the introductory paragraphs above, for instance easier control of mill operation, reduced maintenance costs, simplified mill constructions, and the possibility of effecting slow and small rotational movements of the mill, for instance when carrying out maintenance work, since no additional drive means are required, with the exception of the hydraulic motor. In addition to these advantages, the following advantages are also afforded by the invention:

Landscapes

  • Engineering & Computer Science (AREA)
  • Food Science & Technology (AREA)
  • Crushing And Grinding (AREA)
  • Finish Polishing, Edge Sharpening, And Grinding By Specific Grinding Devices (AREA)
EP92850020A 1991-02-05 1992-02-04 Procédé pour la propulsion d'un moulin et moulin pour l'exécution du procédé Withdrawn EP0500509A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
SE9100352A SE467953B (sv) 1991-02-05 1991-02-05 Saett att driva en kvarn som har en laangstraeckt, cylindrisk kvarnkropp samt kvarn foer utfoerande av saettet
SE9100352 1991-02-05

Publications (1)

Publication Number Publication Date
EP0500509A1 true EP0500509A1 (fr) 1992-08-26

Family

ID=20381817

Family Applications (1)

Application Number Title Priority Date Filing Date
EP92850020A Withdrawn EP0500509A1 (fr) 1991-02-05 1992-02-04 Procédé pour la propulsion d'un moulin et moulin pour l'exécution du procédé

Country Status (7)

Country Link
EP (1) EP0500509A1 (fr)
AU (1) AU635674B2 (fr)
CA (1) CA2058836A1 (fr)
FI (1) FI920490A7 (fr)
NO (1) NO920457L (fr)
SE (1) SE467953B (fr)
ZA (1) ZA92181B (fr)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2011120755A1 (fr) * 2010-04-01 2011-10-06 Siemens Aktiengesellschaft Tube broyeur
WO2014111852A1 (fr) * 2013-01-18 2014-07-24 Metso Minerals Industries, Inc. Broyeur porté par la virole
CN108640428A (zh) * 2018-05-29 2018-10-12 宿州冬宇环保科技有限公司 一种含汞工业废水深处理零排放系统
CN112996602A (zh) * 2018-10-19 2021-06-18 美卓奥图泰芬兰有限公司 研磨机

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH383735A (de) * 1960-05-12 1964-10-31 Ammann U Maschf Ag Vibrationsmühle
EP0184326B1 (fr) * 1984-12-04 1989-01-18 F.L. Smidth & Co. A/S Broyeur tubulaire

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1381583A (en) * 1973-04-06 1975-01-22 Smidth & Co As F L Rotary drums
AU8654782A (en) * 1981-08-17 1983-02-24 Bechtel International Corporation Motor driven rotary apparatus
DE3433905A1 (de) * 1984-09-14 1986-03-27 Krupp Polysius Ag, 4720 Beckum Drehtrommel

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH383735A (de) * 1960-05-12 1964-10-31 Ammann U Maschf Ag Vibrationsmühle
EP0184326B1 (fr) * 1984-12-04 1989-01-18 F.L. Smidth & Co. A/S Broyeur tubulaire

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2011120755A1 (fr) * 2010-04-01 2011-10-06 Siemens Aktiengesellschaft Tube broyeur
WO2014111852A1 (fr) * 2013-01-18 2014-07-24 Metso Minerals Industries, Inc. Broyeur porté par la virole
CN108640428A (zh) * 2018-05-29 2018-10-12 宿州冬宇环保科技有限公司 一种含汞工业废水深处理零排放系统
CN112996602A (zh) * 2018-10-19 2021-06-18 美卓奥图泰芬兰有限公司 研磨机

Also Published As

Publication number Publication date
SE9100352D0 (sv) 1991-02-05
AU635674B2 (en) 1993-03-25
SE9100352L (sv) 1992-08-06
FI920490A7 (fi) 1992-08-06
AU1000192A (en) 1992-08-13
ZA92181B (en) 1992-09-30
NO920457D0 (no) 1992-02-04
NO920457L (no) 1992-08-06
FI920490A0 (fi) 1992-02-05
CA2058836A1 (fr) 1992-08-06
SE467953B (sv) 1992-10-12

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Withdrawal date: 19940615