EP0369149B1 - Rührwerkskugelmühle - Google Patents

Rührwerkskugelmühle Download PDF

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Publication number
EP0369149B1
EP0369149B1 EP89118377A EP89118377A EP0369149B1 EP 0369149 B1 EP0369149 B1 EP 0369149B1 EP 89118377 A EP89118377 A EP 89118377A EP 89118377 A EP89118377 A EP 89118377A EP 0369149 B1 EP0369149 B1 EP 0369149B1
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EP
European Patent Office
Prior art keywords
grinding
agitator
ball mill
mill according
grinding chamber
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Expired - Lifetime
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EP89118377A
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German (de)
English (en)
French (fr)
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EP0369149A1 (de
Inventor
Herbert Dipl.-Ing. Dürr
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Individual
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Individual
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Priority to AT89118377T priority Critical patent/ATE86529T1/de
Publication of EP0369149A1 publication Critical patent/EP0369149A1/de
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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
    • 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
    • B02C17/16—Mills in which a fixed container houses stirring means tumbling the charge

Definitions

  • the invention relates to an agitator ball mill according to the preamble of claim 1.
  • Agitator ball mills for the comminution of solids have been known for a long time. In practice, they are used almost exclusively for so-called wet grinding, i.e. the solids to be ground are suspended or dispersed with a liquid, e.g. Water, solvent, binder solution or the like., Crushed and at the same time dispersed in the liquid. It has also already become known to use agitator ball mills for so-called dry grinding, i.e. for crushing solids without the presence of a liquid. In practice, however, this has not proven successful.
  • wet grinding i.e. the solids to be ground are suspended or dispersed with a liquid, e.g. Water, solvent, binder solution or the like., Crushed and at the same time dispersed in the liquid.
  • agitator ball mills for so-called dry grinding, i.e. for crushing solids without the presence of a liquid. In practice, however, this has not proven successful.
  • an agitator ball mill with a substantially vertically arranged cylindrical grinding container in which a concentrically arranged agitator is arranged to be driven at high speed.
  • This consists of a stirring shaft with attached, essentially radially projecting stirring tools in the form of annular disks or stirring arms or the like.
  • the grinding room This agitator ball mill is filled, for example, with sand as a grinding aid or with corresponding grinding aids made of glass, steel or another suitable hard material up to 75% of its free volume.
  • a ground material suspension is pressed into the grinding chamber at the lower end of the grinding container by means of a pump and leaves the grinding chamber at the upper end after passing through a grinding material-grinding aid separating device.
  • This has a ring fastened to a cover of the grinding container and a disk rotating with the agitator shaft. Between this and the ring, a separating gap which widens conically outwards from the grinding chamber is formed, the width of which is smaller than the diameter of the smallest auxiliary grinding bodies used.
  • the gap width can be adjusted by axially shifting the disc relative to the ring.
  • Such a separation device can - in contrast to a simple sieve or the like.
  • agitator ball mills which can also be arranged horizontally or in an inclined intermediate position between vertical and horizontal, so-called dry grinding of solids is not possible.
  • These known agitator ball mills are usually surrounded by a tempering jacket which encloses the grinding chamber wall and which is usually used for cooling, ie for dissipating the energy introduced during grinding and converted into heat. Especially with highly viscous regrinds, the viscosity increases very markedly with decreasing temperature.
  • Agitator ball mills for use in dry comminution of solids have become known.
  • the basic structure of the agitator ball mill namely an approximately vertically arranged cylindrical grinding container and a high-speed driven agitator arranged concentrically therein and a partial filling of the grinding aid of the grinding chamber, has been retained.
  • the solid to be comminuted is fed to the grinding chamber from below by means of air and leaves the grinding chamber using the transport effect of the air flow at the upper end.
  • the residence time of the solid particles to be comminuted in the grinding chamber is so varied that the grinding result is completely unsatisfactory, since the particle size of the solid is not sufficiently uniform.
  • the regrind accumulates on the wall of the grinding chamber and leads to a coating of such thickness that the operation of the mill can be considerably disturbed.
  • annular gap ball mill for the continuous fine grinding of mineral hard materials, in which a rotor is arranged in a closed grinding container, the outer surface of which limits a grinding gap with the inner surface of the grinding container. Auxiliary grinding bodies are arranged in this grinding gap. The top and bottom of the rotor taper in opposite directions. Not only the rotor but also the grinding bowl is provided with its own rotary drive. To change the grinding gap width, the rotor or the grinding container can be moved transversely to the central axes of the rotor and grinding container, whereby a variable eccentricity between the rotor and grinding container can be achieved. Free movement of the grinding aids is not guaranteed here either.
  • an agitator ball mill of the generic type in which the grinding container can be driven in rotation about the central longitudinal axis of the grinding chamber, which is concentric with the agitator axis, in order to prevent the centrifugal forces exerted on the auxiliary grinding bodies by this to flow through a radially inner outlet opening.
  • the auxiliary grinding bodies are largely removed from the influence of the stirring tools, so that the grinding action of this stirred ball mill is very low.
  • the grinding stock and auxiliary grinding body would accumulate on the rotating inner wall of the grinding chamber, so that the grinding stock and auxiliary grinding body would not move relative to one another.
  • a preparation and comminution device which consists of a rotatable drum with rotors arranged therein.
  • This device is used to process, prepare, mix and shred voluminous, bulky, coarse and hard materials.
  • the rotors are equipped with splitting tools which "impact rip" the materials to be shredded. Brittle fragile materials are mainly impacted, while tough materials are torn.
  • balls can be entered into this device, in which case the splitting tools of the rotors serve as spinning tools. These balls only serve as a comminution aid, in particular by subjecting the materials to be comminuted to a surface. A fine comminution like in agitator ball mills is not possible with this.
  • the invention has for its object to develop an agitator ball mill of the generic type so that both wet comminution and dry comminution is possible.
  • the agitator ball mill according to the invention can be used to carry out both the wet grinding processes customary for agitator ball mills, i.e. Wet comminution processes as well as a so-called dry comminution can be carried out.
  • the eccentric arrangement of the agitator to the grinding chamber ensures on the one hand the free mobility of the auxiliary grinding bodies, and on the other hand forms compression and dispersion zones, which both improve the heat transport and prevent the formation of deposits on the inside of the container, so that the interaction of the eccentric Arrangement of the agitator relative to the grinding chamber as well as the independent rotary movement of the grinding chamber wall are essential.
  • the speed or the peripheral speed of the grinding chamber wall is important for the frequency of the stress on each individual grinding material particle, while the speed of the agitator is important for the intensity of the processing.
  • the speed of the grinding bowl must be matched to the speed of the agitator.
  • the eccentricity of the agitator relative to the grinding chamber is also important for grinding.
  • greater eccentricity ie with a smaller radial distance from the outer circumference of the agitator to the grinding chamber wall, the shear forces, triggered by the rotating movements of the grinding container and agitator, are brought to act on the material to be ground in a spatially smaller extent.
  • the influence of the crescent-shaped, gap-shaped intensive grinding chamber that is to say the part of the grinding chamber with a narrow cross-section, increases, which the ground material has to pass because of the transport effect of the rotating grinding container.
  • the regrind After passing through the zone of extreme stress, the regrind enters a so-called dispersion zone, which is also still in the narrowed cross-sectional area.
  • the dispersion zone the newly created surfaces of the comminuted regrind particles are wetted, for example, with the liquid, so that not only is a re-agglomeration avoided, but also a stabilization of the regrind suspension or regrind dispersion is achieved. This effect of crushing and subsequent dispersion repeated. Even with dry comminution, a re-agglomeration in the narrowed cross-sectional area following the narrowest cross-sectional area between the agitator and the grinding chamber wall is avoided.
  • the deflector assigned to the grinding chamber wall which can also act as a scraper at the same time, makes it possible to direct the material to be ground and the grinding aid into the area of optimal grinding stress. The effects described are thus further optimized. Advantageous details regarding the arrangement and configuration of the deflector result from claims 2 to 4.
  • the measures according to claim 7 result in the deflector being in the region of particularly low grinding media concentrations.
  • the development according to claim 11, in particular in the supplement according to claim 12, is particularly advantageous in the case of dry grinding.
  • By adjusting the speed of the agitator and grinding container in a targeted manner a particularly favorable shape of the drum-shaped surface of the mixture of grinding material and auxiliary grinding body can be achieved.
  • the rotational movement of the grinding container also results in a certain visual process, according to which coarser particles get more into the radially outer areas of the grinding chamber. As a result, the grinding process is improved by the greater concentration of auxiliary grinding bodies in the radially outer region.
  • the purge air supply supports the viewing process.
  • the grinding chamber floor is displaceable in the direction of the central longitudinal axis of the grinding chamber, the relative grinding aid body filling of the grinding chamber and thus the grinding effect can be changed. Furthermore, in connection with the measures according to claims 11 and 12, the distance of the drum-shaped surface of the regrind-auxiliary material mixture relative to the suction device can be adjusted.
  • the measures according to claims 18 and 19 enable dry grinding or wet grinding of regrind of extremely high viscosity in a special way.
  • the training according to claims 2o to 23 creates a particularly favorable option to set a variable separation gap width, the possibility of pulling the auxiliary grinding bodies out of the grinding chamber.
  • the measures according to the invention can generally be used in continuously operating agitator ball mills, to which ground material to be ground is continuously fed and ground material is removed in a corresponding manner, but can also be used in batch-type agitator ball mills. Overall, however, the measures according to the invention are of greater advantage in the case of continuously operating stirred ball mills.
  • the agitator ball mill shown in FIG. 1 has an essentially cylindrical grinding container 1 which is provided with a temperature control jacket 2.
  • a temperature control jacket 2 In the tempering jacket 2 on the one hand an inlet 3 and on the other hand an outlet 4 for a tempering medium, that is to say for a cooling or heating medium, flows through the tempering jacket 2 in accordance with the flow direction arrow 5 shown there.
  • the cylindrical grinding container 1 has a central longitudinal axis 6 which runs vertically, ie the grinding container 1 is vertical.
  • the grinding container 1 is closed at the bottom by a bottom 7 running vertically to the axis 6.
  • the grinding container 1 is supported over a rotary bearing 8, which is arranged concentrically to the axis 6 and is designed as an axial ball bearing, in relation to one that is only indicated Machine frame 9 from, ie the grinding container 1 is rotatable about its central longitudinal axis 6.
  • a rotary drive for the grinding container 1 is a grinding container drive motor 10, which is supported with respect to the machine frame 1, the shaft 11 of which is arranged parallel to the axis 6 and drives the grinding container 1 via a friction wheel gear 12.
  • a friction wheel 13 is attached to the shaft 11, which rests against an annular cylindrical friction surface 14 attached to the outside of the grinding container 1. Due to the large difference between the diameter of the annular cylindrical friction surface 14 on the one hand and the friction wheel 13 on the other hand, the grinding container 1 can be driven at a relatively low speed.
  • An agitator 15 is arranged in the grinding container 1, which essentially and in this respect consists in the usual way of an agitator shaft 16 and agitating tools 17 arranged on the latter.
  • the stirring tools 17 can be stirring disks with through openings 18.
  • the agitator shaft 16 is overhung in its upper area opposite the bottom 7 in an agitator shaft bearing 19. This bearing is held in a non-rotatable end cover 2o which is supported in a manner not shown relative to the machine frame 9. Between the cover 2o and a grinding container cover 21 there is a seal 22 which is arranged concentrically to the central longitudinal axis 6 of the grinding container.
  • the agitator 15 is connected to the machine frame 9 in a manner not shown Agitator drive motor 23 driven, the shaft 24 of which runs parallel to the agitator axis 25.
  • the drive is transmitted to the agitator shaft 16 by means of a belt drive 26.
  • the agitator axis 25 and the central longitudinal axis 6 run parallel to one another and are offset from one another by an eccentricity e.
  • addition devices for various components are arranged which are to be brought together and treated in the grinding container 1.
  • it is a feed screw 27, by means of which solid to be comminuted via an input funnel 28 is conveyed into an addition pipe 29 and through this into the grinding chamber 3o located in the grinding container 1.
  • a feed pipe 31 is provided which leads through the cover 2o into the grinding chamber 3o and through which liquid is supplied by means of a pump 32.
  • the grinding chamber 3o is at least 5o% filled with auxiliary grinding bodies 33. This information relates to the bulk volume of the auxiliary grinding bodies 33 in the free grinding space 3o.
  • the free grinding space 3o is equal to the volume of the grinding container 1 minus the volume of the agitator 15 located in it.
  • an annular gap separating device 35 is provided, in which between one in the bottom 7 of the Grinding container 1 mounted concentrically to its axis 6 and with this circumferential ring 36 and a disc 37 a separation gap 38 is formed, the width a of which is significantly smaller than the diameter b of the smallest auxiliary grinding bodies 33 used. Usually, the width a is smaller than that half smallest diameter b.
  • the disk 37 can be driven in rotation about the axis 6 by means of a drive (not shown).
  • annular gap separators 35 are generally known in agitator mills.
  • the temperature control medium is fed in through the inlet 3 and discharged through the outlet 4 via a conventional rotary pipe coupling 39, which is sealed off from the machine frame 9 by means of a seal 4o.
  • a deflector 41 is arranged in the grinding chamber 3o, which is located in the vicinity or on the cylindrical grinding chamber wall 42 of the grinding container 1, which wall defines the outside of the grinding chamber 3o. It extends essentially over the axial length of the cylindrical grinding chamber wall 42. It is connected to the non-rotatable cover 20 or the bearing 19 fixedly connected thereto by means of an upper holding arm 43 which extends essentially radially inwards. As can be seen in particular from FIGS.
  • Deflectors 41 provided with the deflection surface 44 facing the axis 6 are not arranged radially and not tangentially to the cylindrical grinding chamber wall 42, but instead are set at an angle c relative to a tangent 45 to the grinding chamber wall 42, which is between 10 and 50 °.
  • the deflector 41 is always arranged in such a way that it deflects an impinging regrind-auxiliary material flow radially inwards, for which purpose it is of course sufficiently rigid or rigid. It has a tip 46 facing the grinding chamber wall 42, so that it can also act as a grinding chamber wall wiper.
  • the width f of the deflector 41 in cross section is approximately 5 to 20% of the diameter D of the grinding chamber 3o.
  • the eccentricity e is approximately 2.5 to 15% of the grinding chamber diameter D.
  • the deflector 41 tapers from top to bottom, ie its width f adjacent to the bottom 7 is smaller than at the upper end. The purpose of this is to avoid pressing the auxiliary grinding bodies 33, in particular when starting up the agitator ball mill.
  • the above range of the width f relates to the wide and the narrow end of the deflector 41.
  • the direction of rotation 47 of the agitator 15 will generally be opposite to the direction of rotation 48 of the grinding container 1 (see FIG. 2).
  • the peripheral speed of the agitator 15 should be greater than the peripheral speed of the grinding chamber wall 42 in order to achieve higher flow rates of the grinding stock in the area of the agitator 15 and in particular in the area between the stirring tools 17, since the free flow cross-section for the regrind in this area is reduced due to the presence of the stirring tools 17.
  • the direction of rotation 47 'of the agitator 15 can also run in the same direction as the direction of rotation 48 of the grinding container 1 (see Fig. 3).
  • Such a co-directional drive of grinding container 1 and agitator 15 can be expedient in the case of difficult-to-flow regrind, since this can prevent the difficult-to-flow regrind from being circulated in certain areas, which would otherwise occur when opposing currents meet when the opposing drive of grinding container 1 and Agitator 15 could be the case.
  • a pump effect occurs in the area of a narrowing of the grinding chamber cross section between agitator 15 and grinding chamber wall 42 due to the eccentric arrangement of the agitator 15 relative to the grinding container 1, which prevents the ground material from being circulated only locally.
  • the deflector 41 is arranged in the opposite direction at the start of such a narrowed cross-sectional area 49 between the grinding chamber wall 42 and the agitator 15, the narrowed cross-sectional area 49 being the half of the grinding chamber in which the agitator 15 is arranged and which is characterized by a ( imaginary), the axis 6 receiving center-longitudinal plane is limited, which is normal to a plane that receives the axes 6 and 25.
  • the deflector 41 according to FIG. 3 is arranged at the end of the narrowed cross-sectional area 49.
  • the emerging flows are represented by the flow direction arrows 5o (Fig. 2) and 5o '(Fig. 3).
  • the comminution effect itself takes place in the usual manner in that the auxiliary grinding bodies 33 are accelerated or decelerated by the agitator or the grinding chamber wall 42 and the solids in the material to be ground are crushed and dispersed in the liquid by the movement of the auxiliary grinding bodies 33.
  • the smallest distance h between the agitator 15 and the grinding chamber wall 42, that is to say between the respective outer end of a stirring tool 17 and the grinding chamber wall 42, is in the range from 3 to 15% of the diameter D of the grinding chamber 3o.
  • the total volume of the agitator 15 is small in relation to the volume of the grinding chamber 3o. In any case, it is at most 2o% of the volume of the grinding chamber 3o.
  • the volume of the agitator 15 will regularly be less than 10% of the volume of the grinding chamber 30.
  • millbase is fed as a suspension, ie in the form of solids suspended in liquid, by means of a millbase pump 51 via a millbase feed line 52 through the bottom 7a of the grinding container 1a.
  • the feed takes place by means of a known pipe-rotary coupling 39a, through which the inlet 3 and the outlet 4 for the temperature control medium are also guided.
  • the ground material is removed in the upper area of the grinding container 1a by an annular gap separating device 53. This has a separating gap 54 which is formed between a ring 55 which is fixedly connected to the upper side of the grinding container 1a and a cover plate 56 attached to the agitator shaft bearing 19 is.
  • auxiliary grinding bodies 33 With regard to its width in relation to the diameter of the smallest auxiliary grinding bodies 33, what has been said above with regard to FIG. 1 applies.
  • the ground material freed from auxiliary grinding bodies 33 runs behind the separating device 53 into an annular outlet cup 57 and from there into an outlet channel 58.
  • the bearing 19 is fastened to the machine frame 9 by means of a support arm 59.
  • the deflector 41a is fastened to the cover plate 56 and is thus also stationary with respect to the grinding container 1a and the agitator 15.
  • the grinding container 1b is only shown for the sake of simplifying the drawing without a temperature jacket.
  • cover 2ob which is firmly connected to the agitator shaft bearing 19, it has a regrind feed opening 6o through which the regrind either as a dry solid, as a premixed suspension or in separate addition streams of solid and liquid can be entered into the grinding chamber 3o.
  • the bearing 19 and thus also the cover 2ob are supported against the machine frame 9b by means of a support arm 59, which is only indicated.
  • a grinding material-grinding aid separating device 61 which has an outlet plate 62 inserted into the bottom 7b, the outlet openings 63 of which have a diameter g which is significantly larger than the diameter b is the auxiliary grinding body 33.
  • a closure plate 64 which is arranged below the outlet plate 62 and is supported on an angle lever 66 via a rotary bearing 65, is also provided.
  • the angle lever 66 is pivotally mounted on the machine frame 9b with its central pivot bearing 67.
  • an adjusting drive 68 designed as a hydraulically or pneumatically actuatable piston-cylinder drive acts, which is also supported on the machine frame 9b.
  • the outlet openings 63 of the outlet plate 62 expand in the shape of a truncated cone, that is to say conically downwards.
  • Corresponding fillers 69 are arranged in them and are arranged on the closure plate 64. If the closure plate 64 is brought into its next position to the outlet plate 62 by appropriate actuation of the adjustment drive 68, then a filler 69 closes an outlet opening 63 of the outlet plate 62. When the adjustment drive 68 has moved into its opposite position, in which the closure plate 64 is completely from the outlet plate 62 is lifted down, then the filling of auxiliary grinding bodies 33 can be pulled down through the outlet openings 63.
  • separating gaps 7o are formed between the fillers 69 and the outlet plate 62, which are dimensioned due to the corresponding actuation of the adjustment drive 68 so that the auxiliary grinding bodies 63 are retained in the grinding chamber 3o, but the material to be ground is drawn off downwards.
  • the width a of the separating gaps 7o can thus be set and thus the speed at which the material to be ground is drawn off.
  • the deflector 41b is pivotally mounted in the cover 2ob via its holding arm 43b.
  • the swiveling movements can take place by means of a swivel drive 71 designed as a hydraulically or pneumatically actuated piston-cylinder drive, which is fixed on the machine frame 9b.
  • the seal between the non-rotating cover 2ob and the rotationally drivable grinding container 1b takes place either by means of a mechanical seal 72 (see FIG. 5 on the right) or by means of a lip seal 73 (see FIG. 5 on the left).
  • the pivot bearing 8 is not supported directly on the machine frame 9b, but on a weighing table 74.
  • This is on the one hand via an articulated bearing 75, for example a so-called cutting edge bearing, and on the other hand via a weight measuring device 76, for example a so-called load cell, supported on the machine frame 9b.
  • the adjusting device 68 is controlled by the measuring device 76 by means of a controller 77 in such a way that the total weight of the agitator mill including the grinding material-grinding aid body filling remains constant, ie the grinding material filling level 78 of the grinding chamber 3o is kept constant.
  • this means that the regrind outlet is controlled so that the amount of regrind withdrawn per unit of time is identical to the amount of components supplied per unit of time.
  • a feed channel 8o is provided in the deflector 41c, which is connected to a feed line leading from the outside to the cover plate 56 and its feed opening 82 in the vicinity of the bottom 7c.
  • a further feed channel 83 can be provided in the deflector 41c, which is also connected to an outer feed line 84 and whose feed opening 85 can open into the latter in the axially central region of the grinding chamber 3o, clearly above the base 7c.
  • a further component can, for example, pass through this second feed channel 83 are to be supplied, which should only be supplied when the regrind component supplied in the first feed channel 8o in the vicinity of the bottom 7c has already undergone a certain comminution process.
  • a ground material opening 6od is formed in the cover 2od of the grinding container 1d.
  • the bottom 7d is completely closed.
  • the deflector 41d is hollow. This cavity forms a regrind discharge duct 86, the regrind inlet opening 87 of which is located in the vicinity of the base 7d. It is closed with a separating device 88, for example a sieve, which allows the ground material to pass through, but retains auxiliary grinding bodies 33 in the grinding chamber 30.
  • the regrind flows through the outlet channel 86 into an outer regrind outlet line 89.
  • the outlet channel 86 - like the feed channels 8o, 83 in the exemplary embodiment according to FIG. 6 - can have a width of only a few millimeters; the outer profile of the deflector 41d or the deflector 41c therefore does not need to change compared to the closed embodiments according to the other embodiments.
  • the functionally identical parts which differ structurally from the previous exemplary embodiments are identical to those previously used reference number used is denoted by an added "e".
  • the grinding container 1e is closed with a bottom 7e, in which a sliding guide 9o is formed concentrically to the central longitudinal axis 6 for a guide rod 91 which can be displaced in the direction of the axis 6 and to which a grinding chamber floor 92 which bounds the grinding chamber 3oe is fastened.
  • the grinding chamber floor 92 is adjusted in the direction of the axis 6 by appropriate displacements of the guide rod 91 by means of a drive (not shown), as a result of which the volume of the grinding chamber 3oe is increased or reduced.
  • the stirring tools 17 of the agitator 15e are only indicated.
  • the agitator shaft 16e is hollow and has a regrind feed channel 93 which opens into the grinding chamber 3oe through an opening 94 at the free end of the agitator shaft 16e, that is to say in the vicinity of the grinding chamber floor 92.
  • the regrind fed through the channel 93 is immediately intensively connected to the bed of auxiliary grinding bodies 33.
  • the surface 95 of the mixture of grinding material and auxiliary body forms a so-called trumpet, ie the surface 95 is approximately trumpet-shaped.
  • a free space 96 not filled with regrind and / or grinding auxiliary bodies 33.
  • the surface 95 facing side has sieve openings 98 which do not allow the auxiliary grinding bodies 33 to pass through.
  • the ground material or the fine fractions of the ground material are sucked off through the suction pipe 97.
  • the cover 2oe there is also a purging air nozzle 99 leading into the free space 96, through which purging air is blown into the free space 96, which serves to blow out any clogged sieve openings 98.
  • the height-adjustable grinding chamber floor 92 which serves as a lifting floor, serves not only to set a different packing density of the auxiliary grinding bodies 33 in the grinding chamber 3oe, but also to establish the distance between the surface 94 of the mixture of auxiliary grinding material and the sieve openings 98 of the suction pipe 97.
  • the deflector is not shown in FIG. 8; it can be designed in the same way as shown in FIG. 4.
  • an agitator ball mill in the embodiment of an agitator ball mill according to FIGS. 9 to 11, the above-described embodiments also refer to functionally identical but structurally different parts with the same reference number and an added “f”.
  • this agitator ball mill is a so-called horizontal agitator ball mill.
  • the central longitudinal axis 6f of the grinding container 1f thus runs horizontally.
  • the agitator shaft 16 is also overhung in an agitator shaft bearing 19f which is supported on the machine frame 9f by means of a support arm 59f.
  • the stirring tools 17f are designed in this case as stirring arms.
  • the grinding container 1f is supported in the area of the agitator shaft bearing 19f by means of support rollers 1oo in relation to the machine frame 9f.
  • the grinding container 1f is provided with a hollow shaft journal 1o1, which is arranged concentrically to the axis 6f and is supported by a bearing 1o2 with respect to the machine frame 9f.
  • a regrind feed line 52f is fed through the hollow shaft journal 1o1, through which the regrind is fed into the grinding chamber 3of.
  • the ground material is removed by an annular gap separating device 53f which is formed between the cover plate 56f and the ring 55f.
  • the rotary drive of the grinding container 1f also takes place here via a grinding container drive motor 1o and a friction wheel gear 12.
  • the deflector 41 is when the grinding container 1f and the agitator 15f are driven in opposite directions (see FIG. 1o) and also when the agitator 15 and the grinding container are driven in the same direction 1f (see FIG. 11) each arranged in the upper region, ie in the region of the apex line of the grinding container 1f. In this area the concentration of auxiliary grinding bodies 33 is lowest due to the force of gravity acting on them. Otherwise, what has been said above regarding the embodiment according to FIGS. 1 to 3 applies to the arrangement of the deflector 41.
  • an agitator 15g is arranged in the grinding container 1g and is provided with agitating tools 17g in the form of radially projecting rods.
  • a second agitator 1o4 which has an agitator shaft 1o5 and agitator tools 1o6, is likewise mounted via an agitator shaft bearing 1o3.
  • the agitators 15g and 1o4 have different diameters d and d '.
  • the second agitator 1o4 is driven by a belt drive 1o7 from a motor, not shown.
  • the eccentricity e 'of the axis 1o8 of the second agitator to the axis 6g of the grinding container 1g is different than the eccentricity e.
  • the grinding container 1g, the stirrer 15g and the stirrer 1o6 run in the same direction, the direction of rotation of the second stirrer being designated 1o9.
  • any and all possible combinations of opposite directions of rotation can also be used.
  • the information about the distance of the agitator 15g from the grinding chamber wall also applies to the second agitator 1o4.
  • the above information also applies that their total volume is at most 2o% of the volume of the grinding chamber 3og.
EP89118377A 1988-11-18 1989-10-04 Rührwerkskugelmühle Expired - Lifetime EP0369149B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT89118377T ATE86529T1 (de) 1988-11-18 1989-10-04 Ruehrwerkskugelmuehle.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3838981 1988-11-18
DE3838981A DE3838981A1 (de) 1988-11-18 1988-11-18 Ruehrwerkskugelmuehle

Publications (2)

Publication Number Publication Date
EP0369149A1 EP0369149A1 (de) 1990-05-23
EP0369149B1 true EP0369149B1 (de) 1993-03-10

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KR (1) KR960013915B1 (tr)
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DE10338592A1 (de) * 2003-08-22 2005-03-17 Maschinenfabrik Gustav Eirich Gmbh & Co. Kg Rührwerksmühle
DE102008041104A1 (de) * 2008-08-07 2010-02-11 Maschinenfabrik Gustav Eirich Gmbh & Co. Kg Mischvorrichtung mit Induktionsheizung
DE102008041104A9 (de) * 2008-08-07 2010-05-20 Maschinenfabrik Gustav Eirich Gmbh & Co. Kg Mischvorrichtung mit Induktionsheizung
US9295109B2 (en) 2008-08-07 2016-03-22 Maschinenfabrik Gustav Eirich Gmbh & Co., Kg Mixing device having induction heating

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Publication number Publication date
BR8905846A (pt) 1990-06-12
CA2002550C (en) 1993-06-08
RU1820875C (ru) 1993-06-07
CN1017406B (zh) 1992-07-15
JPH02180651A (ja) 1990-07-13
CS648989A2 (en) 1991-12-17
CA2002550A1 (en) 1990-05-18
DK572889A (da) 1990-05-19
DK572889D0 (da) 1989-11-15
ES2040433T3 (es) 1993-10-16
AU4435589A (en) 1990-05-24
KR900007478A (ko) 1990-06-01
HU206645B (en) 1992-12-28
US4998678A (en) 1991-03-12
KR960013915B1 (ko) 1996-10-10
ZA898693B (en) 1990-08-29
AU620462B2 (en) 1992-02-20
CS274911B2 (en) 1991-12-17
HUT58000A (en) 1992-01-28
ATE86529T1 (de) 1993-03-15
DD288987A5 (de) 1991-04-18
EP0369149A1 (de) 1990-05-23
HU895926D0 (en) 1990-02-28
CN1042670A (zh) 1990-06-06
DE3838981A1 (de) 1990-05-23
DK169773B1 (da) 1995-02-27
UA19153A (uk) 1997-12-25
JP2836629B2 (ja) 1998-12-14
DE58903726D1 (en) 1993-04-15
TR24295A (tr) 1991-07-30

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