EP0045498A1 - Arrangement pour agitateur refroidissable - Google Patents

Arrangement pour agitateur refroidissable Download PDF

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Publication number
EP0045498A1
EP0045498A1 EP81106030A EP81106030A EP0045498A1 EP 0045498 A1 EP0045498 A1 EP 0045498A1 EP 81106030 A EP81106030 A EP 81106030A EP 81106030 A EP81106030 A EP 81106030A EP 0045498 A1 EP0045498 A1 EP 0045498A1
Authority
EP
European Patent Office
Prior art keywords
rotor
cooling channel
stirring tool
cooling
cavity
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.)
Granted
Application number
EP81106030A
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German (de)
English (en)
Other versions
EP0045498B1 (fr
Inventor
Armin Geiger
Johannes Dipl.Ing.Eth Leuthold
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.)
Buehler AG
Original Assignee
Buehler 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 Buehler AG filed Critical Buehler AG
Publication of EP0045498A1 publication Critical patent/EP0045498A1/fr
Application granted granted Critical
Publication of EP0045498B1 publication Critical patent/EP0045498B1/fr
Expired legal-status Critical Current

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    • 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 cooled stirring tool arrangement in agitator ball mills with hollow stirring tools projecting from the rotor and / or stator into the grinding chamber, the hollow space of which extends to a cooling channel arranged in the rotor or stator and through which a coolant flows.
  • the aim of the invention is therefore to create a cooled stirring tool arrangement of the type mentioned at the outset, with which a significantly better cooling efficiency can be achieved.
  • the invention provides that means for increasing the heat transfer to the cooling channel are provided in the cavity.
  • an insert made of a good heat-conducting material such as copper or aluminum is fitted into the cavity, which protrudes from the cavity into the cooling channel and that, in particular, an extension is arranged on the insert projecting into the cooling channel, which is also located in the cooling duct.
  • the heat absorbed by the stirrers which are made of hard, poorly heat-conducting material, is transferred to the relatively soft, but good heat-conducting material inside and from there quickly and completely transferred to the cooling channel, where, due to the flow of the im general liquid coolant the heat supplied is continuously dissipated. Cooling is significantly improved, particularly in the area of tools.
  • tools made of the generally very expensive hard materials such as hard metal are saved by hollowing out and arranging a relatively inexpensive, good heat-conducting material inside valuable material. Because of the more uniform cooling over the entire cross-section of the grinding chamber, a more uniform flow velocity profile is obtained from the wall of the rotor to the wall of the stator, which benefits the grinding quality and uniformity.
  • a first practical embodiment is characterized in that a plate is attached as an extension to the part of the insert projecting into the cooling channel, in particular riveted or soldered on.
  • the plate is preferably arranged in the cooling channel in such a way that the coolant is effectively washed around it on all sides.
  • a further, very economically producible embodiment is characterized in that the part of the insert protruding into the cooling duct is substantially lengthened compared to the transverse dimension of the cooling duct and is bent in the direction of the cooling duct. This eliminates the need to attach a special part to the insert.
  • the cooling capacity on both sides of the tool in the cooling channel can be exploited even better in that the part of the insert projecting into the cooling channel is considerably elongated and longitudinally slit compared to the transverse dimension of the cooling channel, and that the two legs of the extension on opposite sides in the direction of the cooling channel are turned.
  • extension is an expanding head is very economical and simple to manufacture and assemble; who can also wear ribs.
  • the projection protruding from the cavity can be inserted into a bore in a channel wall extending from the wall of the rotor to form a defined cooling channel therein.
  • the relevant channel walls therefore run in the radial direction and extend the path of the coolant around the rotor.
  • the invention also relates to a cooled stirring tool arrangement of the type mentioned at the outset, in which a coolant which can be evaporated at the operating temperature is arranged in the cavity and, after evaporation, is condensed in a condenser which is present outside the stirring tool.
  • Such a known stirring tool cooling arrangement (DE-OS 24 45 631) works with hollow swash and radial discs on a rotor. Due to the centrifugal force, the evaporable cooling medium in the stirring disks is thrown outwards and evaporated due to the warming when the mill is working. The evaporated cooling medium flows out through a space between the hollow rotor and a central tube and is liquefied outside the rotor in a condenser.
  • a further object of the present invention is therefore to provide a cooled stirring tool cooling arrangement in which the evaporated cooling medium can be dispensed with from the rotor or stator.
  • the invention provides that the capacitor is arranged in the rotor or stator itself. In this way, a liquid coolant can be introduced into the rotor or stator and fed to the condenser there using the conventional method. Because of its arrangement in the rotor or stator, the capacitor itself is in a direct communicating connection with the non-filled cavities of the stirring tools.
  • the condenser is a hollow body which adjoins the stirring tool in the direction of the cooling channel and is arranged in the cooling channel and preferably has cooling fins on the outside, the cavity of which communicates with the cavity of the stirring tool.
  • the hollow body should be coaxial with the stirring tool and its cavity should have essentially the same diameter as the cavity of the stirring tool.
  • the hollow body should consist of a good heat-conducting material such as copper or aluminum, while the stirring tool is made of hard metal, for example.
  • the two hollow bodies can be connected to one another by soldering.
  • the above embodiments are suitable both for rotors with a horizontal and for those with a vertical axis of rotation.
  • Another practical embodiment is characterized in that the cavities of the stirring tools are arranged in the interior of the cooling coil which contains the evaporable coolant.
  • the liquid coolant can be introduced in the classic manner into the interior of the rotor or stator, where, instead of the usual cooling channels, the cooling coil is provided, on which the evaporated coolant, which is located in the rotor or stator, is located , precipitates.
  • the stirring tools are shaped outwards from the hollow rotor, because this provides particularly favorable communication between the condenser and the inner wall of the stirring tools.
  • the embodiment described above with a cooling coil is particularly suitable for agitator ball mills with a horizontal axis of rotation.
  • a further advantageous embodiment is characterized in that wall means are arranged in the cavity which subdivide the cavity in the longitudinal direction into at least one coolant supply part and at least one coolant discharge part, the wall means preferably being formed by an insert in the form of a two-start screw. In this way, the coolant is forced to flow into the stirring tool up to its end and then back from there to the cooling channel.
  • the design as a two-start screw is particularly advantageous because the helical course of the coolant flow entails particularly intensive heat dissipation.
  • FIG. 1 schematically shows a section through the wall of an agitator mill rotor 17 which has a cooling channel 12 in the wall area through which a cooling liquid supplied from outside or discharged to the outside flows continuously.
  • the stirring tools 18 consist of poorly heat-conducting hard material, which is pressed into a radial bore in the wall of the rotor 17, the stirring tool 18 made of hard metal is provided with a radially extending cavity 13 according to FIG Copper, aluminum or another good heat-conducting material, for example is glued in with a thermal paste.
  • a thermal paste thermal resistances present at the interface between the insert 14 and the stirring tool 18 can be overcome.
  • the good heat-conducting insert 14 protrudes a little into the cooling channel 12.
  • a plate 15 consisting of a good heat-conducting material is attached, for example by means of a rivet. Since the plate is well-flowed around by the cooling liquid, the heat derived from R 18 mmtechnikmaschine forth through the insert 14 rapidly and continuously to the plate 15 is effectively dissipated.
  • an extension 15 'of the insert 14 bent in the direction of the cooling channel 12 is provided in order to create the large area required for the dissipation of the heat from the insert .14.
  • the rod-shaped insert 14 is slotted in the region protruding from the cavity 13.
  • the two legs 15 ′′ resulting from the slitting are in the direction of the cooling channel 12 bent in opposite directions and together form a large surface for the effective dissipation of the waste heat supplied from the insert 14.
  • the stirring tool 18 is inserted into a radial bore of the rotor 17 by means of an O-ring 10 with a lash holder.
  • the insert which is arranged again in the cavity 13 of the stirring tool 18 and is made of a good heat-conducting material, has at its end facing the cooling channel 12 a widening head 15 ′′ 'around which the liquid coolant flows on all sides and thus effectively dissipates the heat supplied.
  • This head can also wear cooling fins.
  • FIGS. 5 and 6 again shows a stirring tool 18 having a cavity 13 with an axially inserted rod-shaped insert 14 made of a good heat-conducting material, which has a radially extending extension 15 "" which extends into a bore 13 'in a channel wall 17 'is used. With f the direction of flow of the cooling medium is in each case. draws.
  • the intermediate walls 17 ' run helically in the cylindrical cooling channel of the rotor 17, so that a cooling channel 12 which extends around the rotor in a helical manner is formed.
  • the coolant is forced to flow helically around the rotor instead of axially, which is again indicated by the arrows f.
  • the intermediate walls 17' In the area of the bores 13 ', into which the extensions 15 "" are inserted, the intermediate walls 17' have thickened areas 17 "" so that on the one hand a good hold of the extensions 15 "" is ensured and on the other hand a sufficient heat capacity in this area is available.
  • the intermediate walls 17 ' including the thickened portions 17 "" are also made according to the invention from a material which is a good heat conductor, such as copper.
  • 11 and 12 indicate the tangential direction, with a the axial direction of the unwound rotor wall.
  • Fig. 12 is a slightly different, particularly preferred arrangement of the K shown anal frequently disrupt 17 '.
  • the channel walls 17 ′ extend at an angle of less than 360 degrees around the axis a of the rotor 17.
  • the left end of an intermediate wall 17 'in FIG. 12 is to be connected via an inclined piece 17''to the right end of the intermediate wall 17' arranged below in the same figure.
  • This results in substantially circumferentially extending channels 12 which are each connected at a particular circumferential location with the adjacent channel, so that the cooling medium in the direction of arrows f again by a K sselkanal to adjacent is forced to flow before it finally from the cooling channel of the rotor 17 emerges.
  • a wear-resistant material is used in all of the hollow-shaped stirring tools 18 according to the invention than in the case of stirring tools made of solid material.
  • a very high wear quality is preferably achieved with CVD-treated hard metal. It is a hard surface coating with nitrides or carbides, chrome or titanium up to a hardness of 4500 Vickers. Evaporation at temperatures of 1000 to 1050 degrees C with the addition of gases results in a chemical reaction, and then the nitrides or carbides are deposited.
  • the combination of the CVD treatment with the structural design according to the invention represents a particularly important aspect of the present invention.
  • the grinding bodies or balls 21 present in the grinding chamber 11 are also shown.
  • the cavity 13 in the stirring tool 18, which is again made of hard metal, is partially filled according to FIG. 7 with an evaporable cooling medium / such as Freon.
  • the cavity 13 is open to the cooling channel 12 of the rotor 17.
  • a hollow body 16, which is coaxial with the stirring tool 18 and has essentially the same diameter, is connected to this side. The connection is made via a solder joint 9.
  • the hollow body 16 consists of a good heat-conducting material such as copper or aluminum.
  • cooling fins 23 are arranged at regular intervals. The hollow body 16 and the cooling fins 23 run completely within the cooling channel 12 through which a liquid coolant flows.
  • the radially inner end face of the hollow body 16 is sealed, for example by a screw closure 8, with a seal 10.
  • the cooling medium condensed on the inner wall of the cooled hollow body 16 is flung out as liquid into the interior of the stirring tool 18, where it is evaporated again by the heat generated during grinding. It then reaches the hollow body 16 again as a gas, where it is condensed again.
  • a constant evaporation and condensation of the cooling medium takes place in a confined space, which is associated with an effective and rapid dissipation of the grinding heat into the cooling liquid in the cooling channel 12.
  • the rotor tool 18 is, as in the previous embodiments, pressed into the outer rotor ring of the rotor 17 at 7.
  • FIG. 8 schematically shows a horizontally arranged agitator ball mill with a material inlet 24 and a material outlet 25.
  • the stator 26 carries stirring tools 27 which protrude radially inwards and which are not cooled in this exemplary embodiment.
  • the rotor arranged within the stator is hollow and is overhung at 28 on one end face. Cooling water is supplied to or removed from a cooling coil 22 through the hollow rotary shaft 29.
  • the cooling coil 22 extends into the interior of the hollow rotor 17 over its entire length.
  • the grinding media 21 are arranged between the rotor 17 and the stator 26. Inside the hollow rotor 17 is the evaporable cooling medium 20, such as Freon.
  • the stirring tools 18 arranged on the rotor have a cavity 13 which, however, is open to the inside of the rotor, so that the Cooling medium can penetrate into the cavities 13, in particular when the rotor 17 rotates.
  • the liquid cooling medium condensed on the cooling coil 22 will preferably enter the cavities 13 of the stirring tools 18, supported by the centrifugal force, on the respective lower wall of the rotor. It is evaporated there by the heat supplied from the grinding chamber 11. The gas arrives again at the cooling coil 22 and is condensed there while removing the heat of condensation.
  • the stirring tools ' 18 are formed directly out of the rotor ring of the rotor 17, specifically in the embodiment 9 more than in the embodiment according to FIG. 10, where the stirring tools 18 are limited to radial bulges from the rotor ring are.
  • the embodiment according to FIGS. 9 and 10 has the advantage that the cavities 13 communicate very well and intensively with the inside of the rotor 17. This ensures good circulation of the cooling medium 20.
  • the slightly conical shape of the cavity 13 from the outside in is also advantageous in the exemplary embodiments according to FIGS. 1 to 6 (see FIG. 1A) because the heat to be dissipated increases from the outside in, so that larger cross-sections are available inside is an advantage.
  • the stirring tool 18 is provided with a cavity 13, which is divided into a coolant supply part 13 'and a coolant discharge part 13 "by an intermediate wall 14'.
  • the intermediate wall 14 ' extends in the longitudinal direction of the stirring tool 18 and does not extend all the way to at the end thereof, so that a space 10 remains which can be flowed around by the coolant between the end of the wall and the bottom of the stirring tool 13.
  • an insert 14 'in the form of a two-start screw is introduced into the cavity 13.
  • a wall part 9 is provided which allows one thread to open in the supply part of the coolant channel 12, so that the coolant can flow helically through this thread up to the outer end region 8 of the cavity 13.
  • the other thread opens on the opposite side of the wall part 9, so that the coolant flowing from the end region 8 into the second thread enters the outlet part of the coolant channel 12, as is indicated by the arrows in FIG. 14.
  • an insert 14 'in the form of a two-start thread is more advantageous than the insertion of a flat intermediate wall according to FIG. 13 in that the insert 14' is centered on all sides and better heat transfer is ensured because of the higher speed of the coolant.
  • FIG. 15 shows a cross section of the arrangement according to FIG. 14 in the region of contact of the wall piece 9 with the insert 14 '.

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  • Engineering & Computer Science (AREA)
  • Food Science & Technology (AREA)
  • Mixers Of The Rotary Stirring Type (AREA)
  • Accessories For Mixers (AREA)
EP81106030A 1980-08-04 1981-07-31 Arrangement pour agitateur refroidissable Expired EP0045498B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3029528 1980-08-04
DE19803029528 DE3029528A1 (de) 1980-08-04 1980-08-04 Gekuehlte ruehrwerkzeuganordnung

Publications (2)

Publication Number Publication Date
EP0045498A1 true EP0045498A1 (fr) 1982-02-10
EP0045498B1 EP0045498B1 (fr) 1986-12-30

Family

ID=6108858

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EP81106030A Expired EP0045498B1 (fr) 1980-08-04 1981-07-31 Arrangement pour agitateur refroidissable

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EP (1) EP0045498B1 (fr)
DE (2) DE3029528A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5379952A (en) * 1993-02-25 1995-01-10 Buhler Ag Agitator mill

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102008063670B3 (de) * 2008-12-19 2010-01-07 Grieser Maschinenbau Und Service Gmbh Temperiertes Mischwerkzeug und Getriebe für ein temperiertes Mischwerkzeug

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3285330A (en) * 1964-07-09 1966-11-15 Bethlchem Corp Rotary processor
DE2445631A1 (de) * 1973-09-28 1975-04-10 Netzsch Maschinenfabrik Ruehrwerksmuehle
DE2457609A1 (de) * 1974-12-05 1976-06-16 Spangenberg Maschf G Ruehrwerksmuehle
DE2458841A1 (de) * 1974-12-12 1976-06-16 Draiswerke Gmbh Ruehrwerksmuehle
DE2629251A1 (de) * 1976-06-30 1978-01-12 Draiswerke Gmbh Ruehrwerksmuehle

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2745355C2 (de) * 1977-10-08 1993-06-24 Gebrüder Netzsch, Maschinenfabrik GmbH & Co, 8672 Selb Rührwerksmühle

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3285330A (en) * 1964-07-09 1966-11-15 Bethlchem Corp Rotary processor
DE2445631A1 (de) * 1973-09-28 1975-04-10 Netzsch Maschinenfabrik Ruehrwerksmuehle
DE2457609A1 (de) * 1974-12-05 1976-06-16 Spangenberg Maschf G Ruehrwerksmuehle
FR2293248A1 (fr) * 1974-12-05 1976-07-02 Spangenberg Maschf G Broyeur a agitateur
DE2458841A1 (de) * 1974-12-12 1976-06-16 Draiswerke Gmbh Ruehrwerksmuehle
FR2293979A1 (fr) * 1974-12-12 1976-07-09 Draiswerke Gmbh Broyeur a agitateur
DE2629251A1 (de) * 1976-06-30 1978-01-12 Draiswerke Gmbh Ruehrwerksmuehle
FR2356456A1 (fr) * 1976-06-30 1978-01-27 Draiswerke Gmbh Broyeur-melangeur

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5379952A (en) * 1993-02-25 1995-01-10 Buhler Ag Agitator mill
DE4401384C2 (de) * 1993-02-25 2003-04-17 Buehler Ag Rührwerksmühle

Also Published As

Publication number Publication date
DE3175740D1 (en) 1987-02-05
DE3029528A1 (de) 1982-03-04
EP0045498B1 (fr) 1986-12-30

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