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WO2018142014A1 - Ensemble de transmission pour un mélangeur de suspension et cellule de flottation équipée d'un tel ensemble de transmission - Google Patents

Ensemble de transmission pour un mélangeur de suspension et cellule de flottation équipée d'un tel ensemble de transmission Download PDF

Info

Publication number
WO2018142014A1
WO2018142014A1 PCT/FI2017/050053 FI2017050053W WO2018142014A1 WO 2018142014 A1 WO2018142014 A1 WO 2018142014A1 FI 2017050053 W FI2017050053 W FI 2017050053W WO 2018142014 A1 WO2018142014 A1 WO 2018142014A1
Authority
WO
WIPO (PCT)
Prior art keywords
slurry mixer
shaft
slurry
output shaft
transmission assembly
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.)
Ceased
Application number
PCT/FI2017/050053
Other languages
English (en)
Inventor
Markku MINKKINEN
Zakaria MÖNKÄRE
Mikko SORRI
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.)
Outotec Finland Oy
Original Assignee
Outotec Finland Oy
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 Outotec Finland Oy filed Critical Outotec Finland Oy
Priority to FIU20194093U priority Critical patent/FI12473U1/fi
Priority to CN201790001583.7U priority patent/CN210905995U/zh
Priority to PCT/FI2017/050053 priority patent/WO2018142014A1/fr
Publication of WO2018142014A1 publication Critical patent/WO2018142014A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
    • B03D—FLOTATION; DIFFERENTIAL SEDIMENTATION
    • B03D1/00—Flotation
    • B03D1/14—Flotation machines
    • B03D1/16—Flotation machines with impellers; Subaeration machines
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F27/00—Mixers with rotary stirring devices in fixed receptacles; Kneaders
    • B01F27/21—Mixers with rotary stirring devices in fixed receptacles; Kneaders characterised by their rotating shafts
    • B01F27/2122—Hollow shafts
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F27/00—Mixers with rotary stirring devices in fixed receptacles; Kneaders
    • B01F27/21—Mixers with rotary stirring devices in fixed receptacles; Kneaders characterised by their rotating shafts
    • B01F27/213—Mixers with rotary stirring devices in fixed receptacles; Kneaders characterised by their rotating shafts characterised by the connection with the drive
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F27/00—Mixers with rotary stirring devices in fixed receptacles; Kneaders
    • B01F27/80—Mixers with rotary stirring devices in fixed receptacles; Kneaders with stirrers rotating about a substantially vertical axis
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F35/00—Accessories for mixers; Auxiliary operations or auxiliary devices; Parts or details of general application
    • B01F35/30—Driving arrangements; Transmissions; Couplings; Brakes
    • B01F35/33—Transmissions; Means for modifying the speed or direction of rotation

Definitions

  • the present disclosure relates to a transmission assembly for a slurry mixer.
  • the present disclosure further concerns a flotation cell comprising such a transmission assembly.
  • a slurry mixer shaft connected to a slurry mixer head is rotated for mixing the slurry.
  • a fluid flow such as an airflow is introduced to the slurry via the slurry mixer shaft, most often from the slurry mixer head.
  • Rotating the slurry mixer requires a great amount of torque, and hence, power from a motor is transmitted to the slurry mixer shaft via a transmission device.
  • a gear transmission device provides a robust and compact solution for converting a highspeed rotation of a motor into a high torque rotation of the slurry mixer shaft.
  • the gear transmission device cannot slip, there is no mechanical overload protection, and thus, excessive mixing forces may cause damage to the transmission device or the motor running it. Excessive mixing forces may be caused by a very heterogenous particle size distribution of the slurry or even single oversized objects being introduced into the slurry. Such excessive mixing forces may cause mechanical failure of the transmission device, motor, or both. Moreover, it is not feasible to repair a damaged transmission device or motor.
  • An object of the present disclosure is to provide a transmission assembly in which a mechanical failure due to excessive mixing forces does not damage the transmission device.
  • the disclosure is based on the idea of providing a discontinuity on the mechanical structure of the slurry mixer shaft, arranged to exhibit a local maximum on internal stresses caused by mixing forces, when in use.
  • An advantage of the disclosure is that a predetermined failure point is defined on the slurry mixer shaft, which is easy to replace on site. Moreover, the risk of mechanical failure on the transmission device due to excessive mixing forces are minimized, regardless of the type of the mixing force, i.e. whether the mixing force is torsional or radial.
  • FIG. 1 is a schematic cut-view illustration of transmission assembly according to the present disclosure.
  • Fig. 1 illustrates a schematic cut-view of a transmission assembly 1 according to an embodiment of the present disclosure.
  • the transmission assembly 1 comprises a gear transmission device 2 having an input shaft 3 and a hollow tubular output shaft 4.
  • the square boxes marked with an X surrounding the output shaft denote two separate support bearings 7 rotationally supporting the output shaft 4.
  • a slurry mixer shaft 5 having an axial inner passage 5a has a portion 5c at least partially nested within the output shaft 4 for coupling the output shaft 4 with the slurry mixer shaft 5.
  • the slurry mixer shaft has a portion 5b not nested within the output shaft 4, and extending in slurry mixer direction from said output shaft.
  • the slurry mixer shaft 5 also has a portion 5d not nested within the output shaft 4, and extending into a direction opposite to the slurry mixer direction.
  • the slurry mixer shaft 5 has a discontinuity on the mechanical structure thereof. Namely, the outer cross-sectional dimension thereof is different on the portion 5c at least partially nested within the output shaft 4 with respect to the portion 5b not nested within the output shaft 5 and extending to the slurry mixer direction therefrom. This forms a shoulder 5b' providing the discontinuity on the mechanical structure of the slurry mixer shaft 5.
  • the shoulder 5b' may be arranged to abut the slurry mixer side end 4a of the output shaft so as to form a part of the axial locking arrangement therebetween.
  • the portion 5d of the slurry mixer shaft not nested within the output shaft and extending in a direction opposite to the slurry mixer direction may equipped with an attachment means abutting against the corresponding end 4b of the output shaft so as to form another part of the axial locking arrangement between the outputs haft and the slurry mixer shaft 5.
  • the transmission assembly 1 is also equipped with a rotational coupling 6 for introducing a fluid flow from a stationary coupling portion into the inner passage 5a of the slurry mixer shaft 5, rotating when in use.
  • Fig. 2 illustrates a schematic cut-view of a slurry mixer, more specifically a flotation cell 8, equipped with the transmission assembly 1 of Fig. 1 .
  • transmission assembly 1 is provided above a flotation tank 9 of a flotation cell 8, such that the slurry mixer shaft 5 extends within said flotation tank 9.
  • the slurry mixer haft 5 is equipped with a mixer head 5 for agitating the slurry within the flotation tank 8.
  • a first aspect of the present disclosure concerns a transmission assembly 1 for a slurry mixer providing fluid addition via a mixer shaft 5. That is, a fluid may be introduced into the slurry via the mixer shaft 5 either directly form the mixer shaft 5, and / or from a slurry mixer head whereto the fluid is directed via the mixer shaft 5.
  • the transmission assembly 1 comprises a gear transmission device 2 for converting an input rotation to an output rotation, the input rotation being relatively high-speed and low- torque with respect to the output rotation, whereas the output rotation is relatively low- speed and high-torque with respect to the input rotation.
  • the transmission device 2 comprises an input shaft 3 for receiving the input rotation and an output shaft 4 for providing the output rotation to a slurry mixer shaft 5.
  • the output shaft 4 of the transmission device 2 is a hollow tubular shaft arranged to nest a portion 5c of a slurry mixer shaft 5 therein.
  • the transmission assembly 1 further comprises the slurry mixer shaft 5 fixed to the output 4 shaft of the transmission device 2, so as to extend towards a slurry mixer direction.
  • the slurry mixer shaft is equipped with an axial inner passage 5a extending therethrough for conducting a fluid flow.
  • the slurry mixer shaft 5 may be composed of more than one separate section attached to each other so as to form the mixer shaft 5.
  • the consecutive mixer shaft sections could be attached to each other, for example, by flanged joints.
  • the mixer shaft 5 may comprise at a slurry mixer direction end thereof, a slurry mixer head 5d having a shape and dimensioning suitable for agitating slurry when the mixer shaft 5 is rotated.
  • the slurry mixer direction should be understood as the direction, with respect to the transmission assembly 1 , in which the slurry tank resides. That is, in a conventional situation where the transmission assembly 1 is positioned above a slurry tank, the slurry mixer direction would be downwards.
  • other configurations are foreseeable within the scope of the present disclosure.
  • the slurry mixer shaft 5 comprises, on a portion 5b not nested by the output shaft 4, in the slurry mixer direction, a discontinuity 5b' on the mechanical structure of the slurry mixer shaft 5.
  • the discontinuity 5b' is arranged to exhibit a local maximum on internal stresses caused by mixing forces, when in use. Such an arrangement provides a pre-determined failure point that is located outside the transmission device. In other words, a mechanical failure caused by excessive mixing forces can be isolated outside the transmission device, on the slurry mixer shaft 5. Most importantly, the likelihood of excessive mixing forces causing failure of the transmission device 2 are minimized, as the failure will most likely occur at the discontinuity 5b'.
  • Arranging a discontinuity 5b' on the mechanical structure of the slurry mixer shaft 5 provides a further advantage of simultaneously exhibiting a local stress maximum for radial and torsional mixing forces with respect to the slurry mixer shaft 5. This is particularly prominent when compared to arranging a pre-determined failure point at a flanged joint, where the bolts used for joining the flange are suitable for exhibiting a local stress maximum for a shear forces caused by torsional mixing forces but not so much for tensile forces caused by radial mixing forces. Moreover, it has been found that dimensioning such bolts to provide a suitable pre-determined failure point for an excessive radial mixing force will not result in a practical arrangement for withstanding ordinary, non-excessive torsional mixing forces.
  • the portion 5c of the slurry mixer shaft 5 nested within the output shaft 4 has a cross-sectional outer dimension differing from that of an adjacent portion 5b of the slurry mixer shaft 5 in the slurry mixer direction.
  • Such a construction results in a shoulder 5b' being formed on the outer surface of the slurry mixer shaft 5.
  • the shoulder 5b' forms the discontinuity on the mechanical structure of the slurry mixer shaft 5.
  • cross-sectional dimension of a shaft should be understood, for shafts having a round cross-section, as the diameter thereof, and for shafts having non-round cross-section, as the largest cross-sectional dimension thereof.
  • the discontinuity preferably provided as the shoulder 5b', is formed on the slurry mixer shaft 5 at a level of a slurry mixer side end 4a of the output shaft 4. That is, in this particular embodiment the discontinuity 5b' does not necessarily need to abut the slurry mixer side end 4a, but should be located in the immediate vicinity thereof.
  • the discontinuity, preferably provided as the shoulder 5b' on the slurry mixer shaft 5 is arranged to abut the slurry mixer side end 4a of the output shaft 4, thus forming a part of an axial coupling arrangement between the slurry mixer shaft 5 and the output shaft 4.
  • At least the portion 5c of the slurry mixer shaft 5 nested within the output shaft 4 has an outer cross-sectional dimension of preferably between 30 - 190 mm, more preferably between 40 - 140 mm.
  • outer cross-sectional dimension preferably between 30 - 190 mm, more preferably between 40 - 140 mm.
  • such dimensions have been found to provide a pre-determined failure point suitable for conventional applications of slurry mixing and the transmission devices used therewith.
  • the portion 5c of the slurry mixer shaft 5 nested within the output shaft 4 has an outer cross-sectional dimension differing from that of an adjacent portion 5b of the slurry mixer shaft 5 in the slurry mixer direction, such that the dimension of said adjacent portion 5b is preferably 5 - 60 %, more preferably 10 - 50 %, most preferably 20 - 40 % greater than that of the nested portion 5c.
  • a portion 5d of the slurry mixer shaft 5 extends at least a distance from the output shaft 4 in a direction opposite to the slurry mixer direction. Such an arrangement facilitates both providing an axial locking arrangement between the output shaft 4 and the slurry mixer shaft 5, and providing a fluid flow to the inner passage 5a of the flotation mixer shaft 5.
  • the portion 5d of the slurry mixer shaft 5 extending from the output shaft 4 in a direction opposite to the slurry mixer direction may be equipped with a fastener element for abutting against a side end 4b of the output shaft 4 opposite to the mixer side end 4a, the output shaft 4 being thus axially locked between the shoulder 5b' and the fastener element of the flotation mixer shaft 5.
  • Such an arrangement facilitates the replacement of the slurry mixer shaft 5 in order to repair a mechanical failure thereof, for example.
  • the portion 5d of the slurry mixer shaft 5 extending from the output shaft 4 in a direction opposite to the slurry mixer direction may be connected to a rotary coupling 6 for providing a fluid flow to the inner passage 5a of the slurry mixer shaft.
  • a rotary coupling 6 provides a sealed fluid connection between a stationary coupling portion and the rotating slurry mixer shaft 5, when in use.
  • This kind of arrangement provides a coupling for a fluid flow via the slurry mixer shaft 5, which coupling does not hinder the replacement of a slurry mixer shaft 5, for example in order to repair a mechanical failure thereof.
  • the transmission assembly according to the any of the embodiments of the first aspect of the disclosure, as discussed above, may preferably, but not necessarily, be provided a transmission assembly 1 for a flotation cell.
  • a flotation cell 8 being a specific example of a slurry mixer.
  • the flotation sell may be used, for example, separating valuable minerals from ore.
  • the flotation cell comprises a flotation tank 9 for receiving a slurry, and a slurry mixer head 5e arranged within the flotation tank for mixing the slurry.
  • the flotation cell 8 further comprises a transmission assembly 1 according to any of the embodiments of the first aspect of the disclosure, as discussed above.
  • the slurry mixer shaft 5 is coupled with the slurry mixer head 5e for rotating said slurry mixer head and for introducing a fluid flow into the slurry via the slurry mixer shaft 5 and the slurry mixer head 5a.
  • a transmission assembly 1 is particularly advantageous in flotation applications, because excessive mixing forces are a particularly prominent risk in a flotation process. This is due to the fact that a malfunction or failure upstream of the flotation process may result in oversized particles being introduced into the flotation cell, which in turn may result in excessive mixing forces or even jamming the mixer head suddenly. Even without a malfunction or failure upstream of the flotation process, particularly in in connection with flotation application in the mining industry, excessive mixing forces are a prominent risk. In mining applications, flotation is commonly the first process after the mineral ore has been mechanically crushed, resulting in a fairly heterogenous slurry, which in turn results in an increased risk of excessive mixing forces.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Biotechnology (AREA)
  • Accessories For Mixers (AREA)
  • Mixers Of The Rotary Stirring Type (AREA)

Abstract

Un ensemble de transmission (1) pour un mélangeur de suspension avec addition de fluide par l'intermédiaire d'un arbre de mélangeur (5), comprend un dispositif de transmission à engrenage (2) ayant un arbre d'entrée (3) pour recevoir une rotation d'entrée et un arbre de sortie (4). Ledit ensemble comprend également un arbre de mélangeur de suspension (5) fixé à l'arbre de sortie (4), s'étendant vers une direction de mélangeur de suspension, l'arbre de mélangeur de suspension (5) ayant un passage interne axial (5a) s'étendant à travers celui-ci pour conduire un écoulement de fluide. L'arbre de sortie (4)) est un arbre tubulaire creux agencé pour s'emboîter dans une partie (5c) de l'arbre de mélangeur de suspension (5), l'arbre de mélangeur de suspension (5) comprenant, sur une partie (5b) non emboîtée par l'arbre de sortie (4), dans la direction du mélangeur de suspension, une discontinuité (5b') sur sa structure mécanique, agencée pour présenter un maximum local sur les contraintes internes. L'invention concerne également une cellule de flottation (8) équipée d'un tel ensemble (1).
PCT/FI2017/050053 2017-02-01 2017-02-01 Ensemble de transmission pour un mélangeur de suspension et cellule de flottation équipée d'un tel ensemble de transmission Ceased WO2018142014A1 (fr)

Priority Applications (3)

Application Number Priority Date Filing Date Title
FIU20194093U FI12473U1 (fi) 2017-02-01 2017-02-01 Voimansiirtokokoonpano lietesekoitinta varten
CN201790001583.7U CN210905995U (zh) 2017-02-01 2017-02-01 用于浆料混合器的传动组件和具有该传动组件的浮选槽
PCT/FI2017/050053 WO2018142014A1 (fr) 2017-02-01 2017-02-01 Ensemble de transmission pour un mélangeur de suspension et cellule de flottation équipée d'un tel ensemble de transmission

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/FI2017/050053 WO2018142014A1 (fr) 2017-02-01 2017-02-01 Ensemble de transmission pour un mélangeur de suspension et cellule de flottation équipée d'un tel ensemble de transmission

Publications (1)

Publication Number Publication Date
WO2018142014A1 true WO2018142014A1 (fr) 2018-08-09

Family

ID=63040280

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/FI2017/050053 Ceased WO2018142014A1 (fr) 2017-02-01 2017-02-01 Ensemble de transmission pour un mélangeur de suspension et cellule de flottation équipée d'un tel ensemble de transmission

Country Status (3)

Country Link
CN (1) CN210905995U (fr)
FI (1) FI12473U1 (fr)
WO (1) WO2018142014A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114984796A (zh) * 2022-02-28 2022-09-02 浙江汉信科技有限公司 适用于高固含量浆料的搅拌装置

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1172928A (en) * 1967-12-19 1969-12-03 Res & Dev Pty Ltd Improvements in Froth Flotation Apparatus
US3606260A (en) * 1969-01-23 1971-09-20 Ind Process Engineers Agitator seal cartridge
WO2000061269A1 (fr) * 1999-04-09 2000-10-19 Metaullics Systems Co., L.P. Mecanisme de couplage pour systeme de travail du metal en fusion
US20040130042A1 (en) * 2003-01-06 2004-07-08 Spx Corporation Agitator and drive apparatus and method
CN102491545B (zh) * 2011-12-21 2013-09-25 南京蓝深制泵集团股份有限公司 一种双曲面搅拌曝气机
WO2016188812A1 (fr) * 2015-05-26 2016-12-01 EKATO Rühr- und Mischtechnik GmbH Dispositif agitateur

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1172928A (en) * 1967-12-19 1969-12-03 Res & Dev Pty Ltd Improvements in Froth Flotation Apparatus
US3606260A (en) * 1969-01-23 1971-09-20 Ind Process Engineers Agitator seal cartridge
WO2000061269A1 (fr) * 1999-04-09 2000-10-19 Metaullics Systems Co., L.P. Mecanisme de couplage pour systeme de travail du metal en fusion
US20040130042A1 (en) * 2003-01-06 2004-07-08 Spx Corporation Agitator and drive apparatus and method
CN102491545B (zh) * 2011-12-21 2013-09-25 南京蓝深制泵集团股份有限公司 一种双曲面搅拌曝气机
WO2016188812A1 (fr) * 2015-05-26 2016-12-01 EKATO Rühr- und Mischtechnik GmbH Dispositif agitateur

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114984796A (zh) * 2022-02-28 2022-09-02 浙江汉信科技有限公司 适用于高固含量浆料的搅拌装置

Also Published As

Publication number Publication date
CN210905995U (zh) 2020-07-03
FI12473U1 (fi) 2019-10-15

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