EP3311921B1 - Rührwerkskugelmühle - Google Patents

Rührwerkskugelmühle Download PDF

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Publication number
EP3311921B1
EP3311921B1 EP16194368.3A EP16194368A EP3311921B1 EP 3311921 B1 EP3311921 B1 EP 3311921B1 EP 16194368 A EP16194368 A EP 16194368A EP 3311921 B1 EP3311921 B1 EP 3311921B1
Authority
EP
European Patent Office
Prior art keywords
grinding
agitating
disc
ball mill
channels
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.)
Active
Application number
EP16194368.3A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP3311921A1 (de
Inventor
Benedikt SIMONS
Lionel Gross
Norbert Stehr
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.)
Willy A Bachofen AG
Original Assignee
Willy A Bachofen AG
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 Willy A Bachofen AG filed Critical Willy A Bachofen AG
Priority to DK16194368.3T priority Critical patent/DK3311921T3/en
Priority to EP16194368.3A priority patent/EP3311921B1/de
Priority to ES16194368T priority patent/ES2698254T3/es
Priority to PL16194368T priority patent/PL3311921T3/pl
Priority to MYPI2017703632A priority patent/MY189809A/en
Priority to US15/783,304 priority patent/US10173222B2/en
Priority to CN201710958669.5A priority patent/CN107952530B/zh
Priority to KR1020170134700A priority patent/KR101859335B1/ko
Priority to JP2017201896A priority patent/JP6470814B2/ja
Publication of EP3311921A1 publication Critical patent/EP3311921A1/de
Priority to HK18107542.8A priority patent/HK1248174A1/zh
Application granted granted Critical
Publication of EP3311921B1 publication Critical patent/EP3311921B1/de
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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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
    • B02C7/00—Crushing or disintegrating by disc mills
    • B02C7/02—Crushing or disintegrating by disc mills with coaxial discs
    • B02C7/06—Crushing or disintegrating by disc mills with coaxial discs with horizontal axis
    • 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
    • B02C17/16—Mills in which a fixed container houses stirring means tumbling the charge
    • B02C17/163—Stirring means
    • 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
    • B02C17/16—Mills in which a fixed container houses stirring means tumbling the charge
    • 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
    • B02C17/16—Mills in which a fixed container houses stirring means tumbling the charge
    • B02C17/161—Arrangements for separating milling media and ground material
    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
    • B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
    • B02C23/00—Auxiliary methods or auxiliary devices or accessories specially adapted for crushing or disintegrating not provided for in preceding groups or not specially adapted to apparatus covered by a single preceding group
    • B02C23/02—Feeding devices
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
    • B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
    • B02C7/00—Crushing or disintegrating by disc mills
    • B02C7/11—Details
    • B02C7/12—Shape or construction of discs
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
    • B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
    • B02C7/00—Crushing or disintegrating by disc mills
    • B02C7/11—Details
    • B02C7/16—Driving mechanisms
    • 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
    • B02C17/16—Mills in which a fixed container houses stirring means tumbling the charge
    • B02C2017/165—Mills in which a fixed container houses stirring means tumbling the charge with stirring means comprising more than one agitator

Definitions

  • the invention relates to a stirred ball mill according to the preamble of claim 1 and a stirring disk for a stirred ball mill according to the preamble of claim 13.
  • the invention has for its object to provide a higher power input at a lower blade peripheral speed, further to achieve a better energy efficiency for the grinding process to produce a narrow particle size distribution of the treated millbase and at the same time a higher productivity.
  • the object underlying the invention is achieved in a stirred ball mill with the features of independent claim 1 and by a stirring disc having the features of independent claim 13.
  • the basic solution of the invention is to produce particularly pronounced circular flows in the grinding cells, especially at high MahlSystem Grepen, for more effective entrainment of the grinding this accelerating, already beginning at the agitator shaft, trailing walls of the entrainment profiles in inner region at right angles to the central longitudinal axis and - further outside - form backward curved, and the driving profiles not to the disk periphery, so the outer edge of the stirring disc to continue.
  • FIG. 1 a horizontal agitator ball mill is shown. This has in the usual way a stand 1, which is supported on the bottom 2.
  • a stand 1 which is supported on the bottom 2.
  • an optionally variable speed drive motor 3 is housed, which is provided with a V-belt pulley 4, from which via V-belt 5 and another V-belt pulley 6, a drive shaft 7 of the agitator ball mill is rotatably driven.
  • the drive shaft 7 is rotatably supported in an upper portion 8 of the stator 1 by means of a plurality of bearings 9.
  • a substantially cylindrical grinding container 10 is releasably secured at the upper portion 8 of the stator 1.
  • the cylindrical grinding container 10 has an inner wall 11 and is closed at an end facing the upper section 8 by means of a first cover 12 and at the opposite end by means of a second cover 13. It encloses a grinding chamber 14.
  • the inner wall 11 thus forms the Mahlraum-outer boundary.
  • agitator shaft 16 Concentric with the common center-longitudinal axis 15 of the grinding container 10 and the drive shaft 7 is a rotationally fixed to the drive shaft 7 connected agitator shaft 16 is arranged in the grinding chamber 14.
  • the grinding chamber 14 is sealed by means of seals 17 between the first cover 12 and the drive shaft 7.
  • the composite of drive shaft 7 and agitator shaft 16 is cantilevered, so no longer stored in the region of the second lid 13.
  • the agitator shaft 16 is provided over its full length in the grinding chamber 14 with stirring tools, which are circular stirring discs 18.
  • the stirrers 18 are mounted on the agitator shaft 16 and there in a conventional manner, for example by a keyway-groove connection, not shown rotatably held on the agitator shaft 16 and axially held by spacer sleeves 19 at a distance from each other.
  • the agitator shaft 16 with the spacers 19 and the stirring discs 18 form an agitator 20.
  • the spacer sleeves 19 define the substantially annular cylindrical grinding chamber 14 on its inner side, thus forming a Mahlraum-inner boundary.
  • a grinding material feed 21 opens into the grinding chamber 14. From the end of the grinding container 10 opposite the grinding material feed 21, a grinding material discharge 22 issues from the second cover 13.
  • a cylindrical cage 23 is formed on the outer circumference of the second cover 13 adjacent last stirring disc 18. He has distributed over its circumference openings 24.
  • a screen body 26 is arranged, which is attached to the second cover 13 and connected to the grinding stock removal 22.
  • Adjacent stirring discs 18 each have a same axial distance a to each other. Furthermore, adjacent stirring discs 18 define a separation angle .alpha. Which is defined in each case by a line 29 between the outer edge 30 of a stirring disc 18 and the base of an adjacent stirring disc 18 on the agitator shaft 16, ie at the respective Distance sleeve 19 and formed by a line 15 parallel to the axis 31. The following applies: 30 ° ⁇ ⁇ ⁇ 60 °.
  • the gap width b of the annular gap 32 between the outer edge 30 and the wall 11 is at most 20% of the free radius R14 of the grinding chamber 14 between its inner boundary and its outer boundary, that is: b ⁇ 0.2 ⁇ R14.
  • the grinding chamber 14 is substantially filled with grinding media 33, preferably with grinding media 33 of relatively high density materials, for example ZrO 2 (zirconia) high performance ceramics having a solids density of 6.0 g / cm 3 .
  • the grinding media degree of filling is in the range of 50% to 90%, in particular in the range of 80% to 90%.
  • the high solids density of the grinding bodies 33 relative to the density of the grinding suspension is important for the desired effects, namely to promote the grinding media 33 even at relatively low agitator speeds in the area of the surfaces of the respective stirring disks 18 in the MahlSystemverêtte zone to the outside. Between each adjacent stirring discs 18 are grinding cells 34 (see, eg Fig. 4 ) educated.
  • the stirring discs 18 are integrated into the respective stirring disc 18, so not over the surface projecting carrier profiles 35 (see, eg Fig. 2 ) are provided for the grinding bodies 33, which begin immediately on the inner wall of the grinding chamber, ie on the spacer sleeves 19.
  • the width c of the carrier profiles 35 preferably corresponds to 0.5 to 1.5 times the thickness d of the stirring disks 18.
  • FIGS. 2 and 3 These entrainment profiles 35 are formed as flat groove-like channels 36 which are formed on both sides of the corresponding stirring disc 18 overlapping each other, so that between them - like Fig. 3 is removable - a thin wall portion 37 remains.
  • the respective channel 36 has a wall 39, which travels in relation to the direction of rotation 38 of the stirring disk 18 and runs parallel to the central longitudinal axis 15, which is also the center longitudinal axis 15 of the respective stirring disk 18.
  • the grinding media 33 are tangentially entrained in the respective channel 36 of the trailing in the direction of rotation 38 wall 39 and thereby accelerated centrifugally.
  • the tangential velocity and thus the resulting radially outwardly directed centrifugal accelerations increase radially outwardly, as indicated by the radially outwardly increasing length of the velocity arrows 43.
  • the straight, inner channel section 40 has a length f which corresponds to 25% to 60%, preferably 30% to 50%, of the free radius R18 of the stirring disc 18 from the spacer sleeve 19 to the outer edge 30.
  • a radial section 40 of the driving profile 35 which goes well beyond 60% of the free radius R18 of the stirring disk 18 leads to unfavorable turbulence of the grinding bodies 33 which is not usable for the grinding process.
  • the trailing wall 39 passes with a very small transition radius r41 / 42, so to speak, at an acute angle, in the concentric with the outer edge 30 of the stirring disc 18 extending outer boundary of the channel portion 41 through which annular outer region 42 is formed.
  • the transition radius r41 / 42 should advantageously be less than 20% of the width c of the driving profile 35. The following applies: r41 / 42 ⁇ 0.2 ⁇ c.
  • the trailing wall 39 thus exerts exclusively outward accelerations on the grinding bodies 33 up to its outermost end.
  • This embodiment has proved to be particularly conducive to the formation of undisturbed circular flows, that is, pigtail flows 44 (see, for example, US Pat Fig. 4 ), while avoiding secondary vortexes in the milling cells 34, which in turn is a prerequisite for efficient operation with high media fill levels.
  • Fig. 4 can be removed, formed in the individual grinding cells 34 double circular flows, so-called Zopfströmonne 44, from.
  • the grinding bodies 33 and the grinding stock to be treated ie the grinding suspension
  • the stirring disc 18 acts on both sides radially outside of the groove-like channels 36 formed driving profiles 35 as a kind of deflection device.
  • the - related to the total flow direction 45 of the agitator ball mill - upstream side of the outer region 42 of the corresponding stirring disc 18 directs the grinding media-millbase mixture upstream.
  • This action on the grinding bodies 33 opposite to the total throughflow direction 45 causes that these are not transported by the latter in the downstream grinding cell 34 even with increased grinding media filling level and conventional grinding suspension flow rate. This results in a uniform MahlSystemver republic throughout the grinding chamber 14.
  • the grinding suspension flows through the annular space of the gap 32, which is reduced in terms of the grinding body due to the effect of the inventive design of the stirring discs 18, and is drawn into the circular flow 44 in the downstream grinding cell 34.
  • the outer channel sections 41 are provided at the transition to the outer region 42 with a guide bevel 46.
  • the stirring disc 18a after the FIGS. 5 and 6 differs from the stirring disc 18 after the FIGS. 2 and 3 in that the channels 36a are not formed as grooves with a wall section 37 separating them from each other, but that they are designed as through slots having a wall 39 extending from surface to surface of a stirring disc 18a as a driving profile 35a.
  • the mechanism of action basically corresponds to that of the embodiment according to the Fig.
  • the regrind passage openings 47 are arranged only in the immediate vicinity of the spacer sleeve 19 (grinding chamber inner boundary). "In close proximity" means that the radially inner boundary of the regrind passage openings 47 are either adjacent to the spacer sleeve 19 or that the radially inner boundary of the grinding material passage openings are arranged at a small radial distance to the spacer sleeve 19, so that in general that this distance is either zero (adjacent) or up to may be about one tenth of the radial extent R18 of the stirring discs 18c and 18b, respectively ( ⁇ 0.1 * R18).
  • this embodiment is also suitable for highest Mahl stresses fill levels and particularly high flow rates, while maintaining a uniform grinding media distribution along the grinding chamber 14.
  • a high power input can be effected even at reduced agitator speed. Because of the clearly defined delimitation of the grinding cells 34 against each other, an uncontrolled transfer of grinding suspension from a grinding cell 34 into an adjacent grinding cell 34 is completely prevented. Because of this configuration, particularly high grinding qualities with respect to homogeneity result, which can be detected by a narrow particle size distribution of the treated grinding suspension. Otherwise, the mechanism of action is as described above.

Landscapes

  • Engineering & Computer Science (AREA)
  • Food Science & Technology (AREA)
  • Crushing And Grinding (AREA)
  • Mixers Of The Rotary Stirring Type (AREA)
EP16194368.3A 2016-10-18 2016-10-18 Rührwerkskugelmühle Active EP3311921B1 (de)

Priority Applications (10)

Application Number Priority Date Filing Date Title
DK16194368.3T DK3311921T3 (en) 2016-10-18 2016-10-18 Stirring Ball Mill
EP16194368.3A EP3311921B1 (de) 2016-10-18 2016-10-18 Rührwerkskugelmühle
ES16194368T ES2698254T3 (es) 2016-10-18 2016-10-18 Molino de bolas con mecanismo agitador
PL16194368T PL3311921T3 (pl) 2016-10-18 2016-10-18 Młyn kulowy z mieszadłem
MYPI2017703632A MY189809A (en) 2016-10-18 2017-09-27 Agitator ball mill
US15/783,304 US10173222B2 (en) 2016-10-18 2017-10-13 Agitator ball mill
CN201710958669.5A CN107952530B (zh) 2016-10-18 2017-10-16 搅拌器式球磨机
KR1020170134700A KR101859335B1 (ko) 2016-10-18 2017-10-17 교반기 볼 밀
JP2017201896A JP6470814B2 (ja) 2016-10-18 2017-10-18 撹拌ボールミル
HK18107542.8A HK1248174A1 (zh) 2016-10-18 2018-06-11 攪拌器式球磨機

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP16194368.3A EP3311921B1 (de) 2016-10-18 2016-10-18 Rührwerkskugelmühle

Publications (2)

Publication Number Publication Date
EP3311921A1 EP3311921A1 (de) 2018-04-25
EP3311921B1 true EP3311921B1 (de) 2018-09-26

Family

ID=57144919

Family Applications (1)

Application Number Title Priority Date Filing Date
EP16194368.3A Active EP3311921B1 (de) 2016-10-18 2016-10-18 Rührwerkskugelmühle

Country Status (10)

Country Link
US (1) US10173222B2 (es)
EP (1) EP3311921B1 (es)
JP (1) JP6470814B2 (es)
KR (1) KR101859335B1 (es)
CN (1) CN107952530B (es)
DK (1) DK3311921T3 (es)
ES (1) ES2698254T3 (es)
HK (1) HK1248174A1 (es)
MY (1) MY189809A (es)
PL (1) PL3311921T3 (es)

Families Citing this family (8)

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DE102013111762A1 (de) * 2013-07-08 2015-01-08 Netzsch-Feinmahltechnik Gmbh Rührwerkskugelmühle mit Axialkanälen
WO2019045215A1 (ko) 2017-08-31 2019-03-07 (주)아모레퍼시픽 수면장애 예방 또는 치료용 조성물
CN111744608B (zh) * 2020-07-02 2021-07-09 山东旭华微粉有限公司 一种废弃钢渣回收再处理方法
CN112791838A (zh) * 2021-01-30 2021-05-14 重庆三铭重工有限公司 一种立轴式冲击破碎机进料口自动调节结构及调节方法
CN114178001B (zh) * 2021-11-08 2024-02-02 北京天地融创科技股份有限公司 卧式细磨机
CN114178002B (zh) * 2021-11-08 2023-05-09 北京天地融创科技股份有限公司 细磨机
JP7111400B1 (ja) 2021-12-10 2022-08-02 淺田鉄工株式会社 分散機
CN114179223B (zh) * 2021-12-15 2022-08-19 中国矿业大学 一种利用水泥基材料封存二氧化碳的搅拌养护一体装置

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Also Published As

Publication number Publication date
KR20180042811A (ko) 2018-04-26
KR101859335B1 (ko) 2018-06-27
ES2698254T3 (es) 2019-02-01
JP2018108572A (ja) 2018-07-12
CN107952530B (zh) 2019-11-08
US20180104698A1 (en) 2018-04-19
EP3311921A1 (de) 2018-04-25
DK3311921T3 (en) 2019-01-14
US10173222B2 (en) 2019-01-08
JP6470814B2 (ja) 2019-02-13
CN107952530A (zh) 2018-04-24
HK1248174A1 (zh) 2018-10-12
MY189809A (en) 2022-03-09
PL3311921T3 (pl) 2019-03-29

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