EP0019834B2 - Verfahren zum Entlüften von viskosem Mahlgut - Google Patents

Verfahren zum Entlüften von viskosem Mahlgut Download PDF

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Publication number
EP0019834B2
EP0019834B2 EP80102784A EP80102784A EP0019834B2 EP 0019834 B2 EP0019834 B2 EP 0019834B2 EP 80102784 A EP80102784 A EP 80102784A EP 80102784 A EP80102784 A EP 80102784A EP 0019834 B2 EP0019834 B2 EP 0019834B2
Authority
EP
European Patent Office
Prior art keywords
grinding
vacuum
ground
separating
regrind
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
Application number
EP80102784A
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German (de)
English (en)
French (fr)
Other versions
EP0019834B1 (de
EP0019834A1 (de
Inventor
Herbert Dürr
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.)
Draiswerke GmbH
Original Assignee
Draiswerke GmbH
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
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First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=6071757&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=EP0019834(B2) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Application filed by Draiswerke GmbH filed Critical Draiswerke GmbH
Priority to AT80102784T priority Critical patent/ATE1601T1/de
Publication of EP0019834A1 publication Critical patent/EP0019834A1/de
Publication of EP0019834B1 publication Critical patent/EP0019834B1/de
Application granted granted Critical
Publication of EP0019834B2 publication Critical patent/EP0019834B2/de
Expired 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
    • B02C17/16—Mills in which a fixed container houses stirring means tumbling the charge

Definitions

  • the invention relates to a method according to the preamble of claim 1.
  • the venting of viscous ground material and in particular of pasty, ie highly viscous ground material, such as paints after grinding, is extremely difficult.
  • a closed agitator mill which has a milling chamber enclosing a milling chamber, in which a rotatingly driven agitator is arranged.
  • Grist is pumped into the grinding chamber from below.
  • the grinding chamber is closed by a separating gap separating device, on the other side of which a discharge chamber is arranged.
  • a line opens out of this discharge space, in which a material suction pump is arranged.
  • the agitator shaft is led upwards out of the discharge area, sealed by means of a stuffing box.
  • a vacuum line opens into the discharge area near this shaft seal.
  • the agitator mill is operated in such a way that the discharge space is also at least to a considerable extent filled with regrind, the degree of filling of the discharge space being achieved by coordinating the feed pump on the one hand and the suction pump on the other. In any case, the discharge space is filled to such an extent that there is a high liquid column above the separation gap.
  • the only thing that is decisive for the operation of this known agitator mill is that a drum is formed, that is to say that the centrifugal force of the rotating shaft creates a material-free space in the discharge space, so that the shaft seal is not burdened by regrind.
  • a standing agitator mill is known from DE-A-1482393, the cylindrical grinding container of which is provided at the top with an inlet funnel, to which regrind is fed freely through a line.
  • a separating gap separating device is provided, through which the ground material flows into a discharge chamber, from where it is discharged through a line.
  • Paddles are attached to the underside of the disk of the separating device coupled to the agitator shaft, which convey the regrind escaping through the separating gap of the separating device via the line to the outside.
  • the arrangement of such a suction pump behind the separating device is necessary because the ground material is fed to the grinding chamber without pressure and thus only the static pressure of the ground material column prevails at the separating gap in the grinding chamber.
  • the suction pump behind the separating device therefore only has the function that is assigned to the feed pump on the grinding material inlet side in the case of the generic agitator mills through which the flow flows from bottom to top. Any kind of ventilation of the ground material behind the separating device is not possible. Insofar as there is air in the regrind that can escape freely, this air rises in the known agitator mill, that is to say towards the regrind inlet. Since the discharge line rises upwards on the regrind outlet side, the regrind to be removed is backlogged so that the discharge space is completely filled.
  • a horizontally arranged agitator mill is known from DE-A-2323733, the ground material is fed in at one end and is removed as a separating device at the other end through a stationary slotted screen.
  • the regrind flows into a relatively large discharge space which can be subjected to a vacuum, in which it is constantly circulated by means of a stirring tool, so that new surface parts of the regrind are always exposed to the negative pressure for the purpose of ventilation.
  • the height of the regrind filling in the evacuable discharge space is determined by a regulating valve located in the bottom of the discharge nozzle. The design effort for this venting device is relatively large. Otherwise, the venting effect is still unsatisfactory.
  • the agitator mill has a separating device consisting of a cylinder sieve which retains the auxiliary grinding bodies located in the grinding chamber of the agitator mill.
  • a storage container upstream of the mill and a collecting container downstream of the agitator mill are each subjected to a vacuum.
  • the grinding chamber of the mill itself can be subjected to a vacuum.
  • a dispersing and homogenizing agent to a heatable mixing tank assign gregat and connect a vacuum ventilation system.
  • This consists of a container in the form of a cone standing on top, into which a line coming from the mixing tank opens. The viscous material fed through this line is fed onto a high-speed driven centrifugal disc, which hoses the material in a relatively finely divided manner.
  • the container is pressurized with vacuum via a vacuum line.
  • a discharge pump is connected to the lower end of the container.
  • the invention has for its object to achieve a particularly simple ventilation of viscous regrind.
  • the use of the generic agitator mill ensures that the vacuum itself does not penetrate into the grinding chamber of the agitator mill, so that the disadvantages that occur when the agitator mill is subjected to vacuum directly do not occur.
  • ventilation is achieved that cannot be achieved on roller mills.
  • the volume output does not correspond to that of a roller mill, but that of the agitator mill. The total investment costs for a roller mill or another vacuum ventilation system and the energy costs for this are completely eliminated by the solution according to the invention.
  • the agitator mill shown in the drawing has in the usual way a stand 1, on the top of which a projecting support arm 2 is attached, to which in turn a cylindrical grinding container 3 is attached.
  • an electric drive motor 4 is accommodated, which is provided with a V-belt pulley 5, of which a V-belt pulley 8, which is non-rotatably connected to an agitator 7, can be driven in rotation by means of the V-belt 6.
  • the grinding container 3 has a cooling jacket 9 which is delimited by a cylindrical inner wall 10 and a likewise cylindrical outer wall 12 arranged concentrically to the central longitudinal axis 11 of the grinding container 3.
  • the inner wall 10 and the outer wall 12 are connected to one another at the top and bottom by end rings 13, 14.
  • a cooling water connection 15 opens at the bottom and a cooling water outlet 16 at the top.
  • the grinding container 3 is closed at its lower end by a base plate 17 which is fastened, for example, by means of screws 18 to the lower end of the cooling jacket in the end ring 13.
  • On the base plate 17 there is a feed stock 19 through which the regrind can be pumped from below into the grinding chamber 20 of the grinding container 3.
  • the agitator 7, which is arranged concentrically to the central longitudinal axis 11, consists of an agitator shaft 21, on which discs 22 which are concentrically and non-rotatably project radially are attached. Spacers 23 are attached between adjacent disks 22. On the outer circumference of each disk 22, a plurality of stirring rods 24 are attached, projecting radially.
  • counter rods 25 Attached to the cylindrical inner wall 10 of the grinding container 3 are counter rods 25 which protrude radially into the grinding chamber 20 and are arranged axially in such a way that they always lie between two axially adjacent stirring rods 24.
  • the structure of this agitator 7 as a hollow, coolable agitator and the design of the counter rods 25 is shown and described in detail in DE-A-26 29 251 (corresponding to US-A-4129261), to which reference can be made for information purposes.
  • the grinding chamber 20 is closed at the top by a separating device 26, which consists of an annular disk 28 attached to the agitator shaft 21 in a rotationally fixed manner by means of a feather key connection 27 and a stationary counter ring 29 arranged concentrically thereto.
  • This counter ring 29 is screwed onto the upper end of the cooling jacket 9 by means of screws 30.
  • This counter ring 29 also serves as a connecting flange for fastening a cover 31 by means of screws 32.
  • This cover includes a discharge space 33, from which a regrind outlet connection 34 opens.
  • the agitator shaft 21 passed through the discharge space 33 is guided through the cover hood 31 in a sealed manner by means of a stuffing box 35 which is only indicated.
  • the connection between the cover 31 and the Grinding container 3 is also gas and liquid tight.
  • a collecting container 37 which can be moved on rollers 36 is displaceably arranged on the bottom 38 and is closed in a gas-tight and liquid-tight manner with a removable cover 39.
  • the regrind outlet connection 34 is connected to this collecting container 37 via a transfer line 40 which opens into the cover 39.
  • a sight glass 41 can be fitted in cover 39.
  • a vacuum line 42 opens into the discharge space 33, through which a corresponding negative pressure can be generated and maintained.
  • a vacuum line 43 for example attached to the cover 39, can be provided, through which a corresponding negative pressure can be generated and maintained in the collecting container 37. Due to the connection of the discharge space 33 with the collecting container 37 via the transfer line 40, the vacuum propagates anyway from the discharge space 33 to the collecting container 37 or vice versa.
  • the grinding chamber 20 is filled in the usual way to 50 to 70% of its free volume with auxiliary grinding bodies 44, only one of which is shown in the enlarged partial section of FIG. 3.
  • auxiliary grinding bodies 44 are retained in the grinding chamber 20 by the separating device 26, specifically in that the separating gap 45 between the annular disk 28 rotating with the agitator shaft 21 and the counter ring 29 firmly connected to the grinding container 3 at its narrowest point - facing the grinding chamber 20 has a width a which is smaller than the diameter d of the smallest auxiliary grinding bodies 44 located in the grinding container 3, so that no auxiliary grinding bodies 44 can enter the discharge space 33 through this separating gap 45.
  • FIG. 2 and in particular from FIG.
  • the separating gap delimiting surfaces 46, 47 on the annular disk 28 on the one hand and on the counter ring 29 on the other hand are inclined radially outwards from the grinding chamber 20, i.e. they have a radial directional component, namely a radially outward directional component.
  • the separating gap limiting surface 47 formed on the counter ring is inclined somewhat more than the separating gap limiting surface 46 formed on the annular disk 28, so that the separating gap 45 widens from the grinding chamber 20 to the discharge chamber 33.
  • the narrowest gap width a is primarily adapted to the auxiliary grinding bodies 44, but in any case it is so narrow that the vacuum from the discharge space 33 does not spread into the grinding space 20, since a vacuum in the grinding space would cause air to escape during the grinding escapes from the regrind. Such an air passage would affect the grinding.
  • the regrind that emerges from the grinding chamber 20 after grinding into the discharge chamber 33 is simultaneously subjected to high shear forces between the separating gap boundary surfaces 46 and 47 that are moved relative to one another, and at the same time is subjected to negative pressure from the narrowest point facing the grinding chamber 20 increases in width a toward the upper end of the separation gap 45 facing the discharge space 43.
  • the regrind is also discharged from this separation gap in the form of an atomizing ring film, the particles of which are then deaerated under vacuum in the discharge chamber.
  • the regrind which is usually color, is therefore subjected to extremely favorable ventilation.
  • the ratio of a / d is usually from% to 1/2.
  • the widening of the separation gap 45 from the narrowest point facing the grinding chamber 20 with the width a to the furthest side facing the discharge chamber 33 is 10a to 20a.
  • the length of the separation gap 45 from the narrowest to the widest point is about 20 to 70 mm.
  • the excellent venting effect is essentially due to the fact that the air bubbles present in the ground material burst when they emerge from the separation gap 45.
  • the proportion of air in the regrind is extremely high, because the color or pigment contains an extremely large amount of air due to its production.
  • air is additionally sucked into and dispersed in the regrind.
  • the agitator mill not only the color, i.e. the pigment is finely dispersed in its binder or solvent, but that the existing air is also finely dispersed here.

Landscapes

  • Engineering & Computer Science (AREA)
  • Food Science & Technology (AREA)
  • Crushing And Grinding (AREA)
  • Mixers Of The Rotary Stirring Type (AREA)
  • Disintegrating Or Milling (AREA)
  • Degasification And Air Bubble Elimination (AREA)
EP80102784A 1979-05-26 1980-05-20 Verfahren zum Entlüften von viskosem Mahlgut Expired EP0019834B2 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT80102784T ATE1601T1 (de) 1979-05-26 1980-05-20 Verfahren zum entlueften von viskosem mahlgut, verwendung einer ruehrwerksmuehle zur durchfuehrung des verfahrens und ruehrwerksmuehle.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE2921408 1979-05-26
DE19792921408 DE2921408A1 (de) 1979-05-26 1979-05-26 Verfahren zum entlueften von viskosem mahlgut, verwendung einer ruehrwerksmuehle zur durchfuehrung des verfahrens und ruehrwerksmuehle

Publications (3)

Publication Number Publication Date
EP0019834A1 EP0019834A1 (de) 1980-12-10
EP0019834B1 EP0019834B1 (de) 1982-09-29
EP0019834B2 true EP0019834B2 (de) 1986-05-14

Family

ID=6071757

Family Applications (1)

Application Number Title Priority Date Filing Date
EP80102784A Expired EP0019834B2 (de) 1979-05-26 1980-05-20 Verfahren zum Entlüften von viskosem Mahlgut

Country Status (5)

Country Link
US (1) US4382557A (enrdf_load_stackoverflow)
EP (1) EP0019834B2 (enrdf_load_stackoverflow)
JP (1) JPS55157339A (enrdf_load_stackoverflow)
AT (1) ATE1601T1 (enrdf_load_stackoverflow)
DE (2) DE2921408A1 (enrdf_load_stackoverflow)

Families Citing this family (26)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3106062A1 (de) * 1981-02-19 1982-09-09 Draiswerke Gmbh, 6800 Mannheim Ruehrwerksmuehle
JPS6028487Y2 (ja) * 1981-03-16 1985-08-29 浅田鉄工株式会社 グレインミル等におけるダイナミックセパレ−タ−
JPS59102452A (ja) * 1982-11-30 1984-06-13 大久保　敏之 竪型ボ−ルミル
JPS6111162A (ja) * 1984-06-26 1986-01-18 川崎重工業株式会社 竪型媒体撹拌式微粉砕機
JPS6129842U (ja) * 1984-07-24 1986-02-22 三井三池化工機株式会社 乾式メデイア撹拌型粉砕機
JPS63118950U (enrdf_load_stackoverflow) * 1987-01-26 1988-08-01
JPS63122642U (enrdf_load_stackoverflow) * 1987-01-30 1988-08-09
JP2637450B2 (ja) * 1988-01-18 1997-08-06 キヤノン株式会社 バツチ式湿式分散装置およびそれを用いた電子写真感光体塗工液の分散方法
EP0379588B1 (en) * 1988-06-10 1996-03-27 Kubota Corporation Method and apparatus for grinding and pulverization
JPH02160059A (ja) * 1988-12-13 1990-06-20 Yasuyuki Ogawa 粉砕機
SE469417B (sv) * 1991-12-20 1993-07-05 Sala International Ab Saett och anordning foer finmalning av foer filleraendamaal anvaendbara mineral i torrt tillstaand
GB0125497D0 (en) * 2001-10-24 2001-12-12 Colormatrix Europe Ltd Apparatus and method for delivering fluent colourant material
US9216920B2 (en) 2005-05-17 2015-12-22 Robert J. Galletta, JR. Methods and apparatus for controlled scrubbing and aeration of liquid medium
US9084973B2 (en) 2005-05-17 2015-07-21 Robert J. Galletta, JR. Methods and apparatus for aeration of liquid medium and vectoring flow control
US8096531B2 (en) * 2005-05-17 2012-01-17 Galletta Robert J Method and apparatus for aeration of liquid medium in a pipe
US9266759B2 (en) 2005-05-17 2016-02-23 Robert J. Galletta Methods and apparatus for aeration of liquid medium and liquid medium treatment system
US8191869B2 (en) * 2005-05-17 2012-06-05 Galletta Aerator, LLC Method and apparatus for submersible or self contained aeration of liquid medium
US7427058B2 (en) * 2005-05-17 2008-09-23 Galletta Jr Robert J Method and apparatus for aeration of liquid medium
US8454000B2 (en) * 2005-05-17 2013-06-04 Robert J. Galletta, JR. Method and apparatus for controlled aeration of liquid medium in a pipe
EP2272591B1 (de) * 2009-07-06 2013-09-11 Willy A. Bachofen AG Rührwerkskugelmühle
US9764329B2 (en) * 2013-01-15 2017-09-19 Aaron Engineered Process Equipment, Inc. Rotary mill
DE102013006405B3 (de) * 2013-04-13 2014-08-28 Pallmann Maschinenfabrik Gmbh & Co. Kg Vorrichtung zum Zerkleinern von Aufgabegut
CN103394213A (zh) * 2013-07-09 2013-11-20 哈尔滨工程大学 一种旋叶式小型气泡分离装置
FI3328546T3 (fi) * 2015-07-28 2024-07-15 Metso Finland Oy Parannukset jauhatusmyllyissä
CN113842729B (zh) * 2021-09-24 2022-11-25 南京利卡维智能科技有限公司 一种多轴研磨机用真空抽取机构及其真空研磨方法
JP7585544B1 (ja) * 2024-06-24 2024-11-18 みづほ工業株式会社 撹拌装置

Family Cites Families (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2695755A (en) * 1951-01-02 1954-11-30 John J Denovan Method and apparatus for disintegrating raw materials
DE1482391B1 (de) * 1964-06-20 1970-08-20 Draiswerke Gmbh Ruehrwerksmuehle
DE1482393A1 (de) * 1964-10-28 1970-12-23 Draiswerke Gmbh Ruehrwerksmuehle
DE1507528B1 (de) * 1966-12-06 1970-09-24 Fryma Masch Ag Vorrichtung zum Verarbeiten und Aufbereiten fliessfaehiger Produkte
DE1607480C3 (de) * 1968-01-08 1974-11-14 Draiswerke Gmbh, 6800 Mannheim Gasdicht geschlossene Rührwerksmühle
DE2323733A1 (de) * 1973-05-10 1974-11-28 Spangenberg Maschf G Ruehrwerksmuehle mit vorrichtung zum evakuieren des mahlgutes
JPS5250769Y2 (enrdf_load_stackoverflow) * 1973-08-23 1977-11-17
DE2629251C2 (de) * 1976-06-30 1987-03-19 Draiswerke Gmbh, 6800 Mannheim Rührwerksmühle
CH618893A5 (enrdf_load_stackoverflow) * 1977-04-29 1980-08-29 Buehler Ag Geb
US4273295A (en) * 1979-04-04 1981-06-16 Gebruder Netzsch, Maschinenfabrik Gmbh & Co. Agitator mill

Also Published As

Publication number Publication date
ATE1601T1 (de) 1982-10-15
JPS6329590B2 (enrdf_load_stackoverflow) 1988-06-14
DE2921408A1 (de) 1980-11-27
US4382557A (en) 1983-05-10
EP0019834B1 (de) 1982-09-29
JPS55157339A (en) 1980-12-08
DE3060896D1 (en) 1982-11-11
EP0019834A1 (de) 1980-12-10

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