EP0219036B2 - Ringspaltmühle - Google Patents

Ringspaltmühle Download PDF

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Publication number
EP0219036B2
EP0219036B2 EP86113847A EP86113847A EP0219036B2 EP 0219036 B2 EP0219036 B2 EP 0219036B2 EP 86113847 A EP86113847 A EP 86113847A EP 86113847 A EP86113847 A EP 86113847A EP 0219036 B2 EP0219036 B2 EP 0219036B2
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EP
European Patent Office
Prior art keywords
grinding
inner body
grinding container
annular gap
container
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 - Lifetime
Application number
EP86113847A
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German (de)
English (en)
French (fr)
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EP0219036A3 (en
EP0219036A2 (de
EP0219036B1 (de
Inventor
Karl-Heinz Hoffmann
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.)
BRIGITTE HEDWIG HERTA ERDMUTE HOFFMANN TE ROMMERSK
Original Assignee
Hoffmann Brigitte Hedwig Herta Erdmute
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Application filed by Hoffmann Brigitte Hedwig Herta Erdmute filed Critical Hoffmann Brigitte Hedwig Herta Erdmute
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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
    • B02C17/166—Mills in which a fixed container houses stirring means tumbling the charge of the annular gap type

Definitions

  • the invention relates to an annular gap mill for continuous micronization, in particular of mineral hard materials, with an outer grinding container in which a rotationally symmetrical inner body is arranged, the outer surface of which limits a grinding gap with the inner surface of the grinding container and which is connected to a rotary drive.
  • Mineral hard materials such as corundum, zirconium dioxide, aluminum oxide, silicon carbide and similar substances, have so far been mainly crushed in ball mills with iron balls. This requires considerable dwell times of the material in the grinding chamber, and all parts that come into contact with the material to be ground and the iron balls are subject to very heavy wear. In addition, the grinding process is associated with annoying noise. Another disadvantage of such ball mills is that the abrasion of the iron balls gets into the regrind and has to be washed out in chemical washing processes in a complicated and expensive manner.
  • Annular gap mills of the type mentioned at the outset with a cylindrical or a truncated cone-shaped, rectilinear, rotatable inner rotor (DE-OS 2 848 479) are said to be an improvement over the conventional ball mills, but are not very suitable for the fine comminution of mineral hard materials and only for the comminution of much softer fabrics, e.g. Chalk and the like, economically. This is primarily due to the behavior of grinding balls or grinding beads in the grinding gap.
  • the grinding beads which are pumped into the grinding gap from below, together with the regrind (slurry) initially move due to the pressure of the feed pump with which the grinding stock suspension is pressed into the annular gap mill and the rotational movement of the rotor in the grinding gap, but they sink Relief of the pump pressure due to gravity and do not allow a grinding process to take place in the upper part of the grinding gap. If you want to prevent this, the feed pump pressure or the regrind flow must be increased so that the grinding beads are also held in the upper part of the grinding gap; then there is the danger that the grinding beads are discharged together with the regrind, which in turn reduces the grinding performance.
  • the vane pump wheel only reinforces another disadvantage of this annular gap mill, which is that grinding beads that do not sag down are increasingly pumped to the outlet opening with the material to be ground and are therefore also lost to the grinding process.
  • the vane pump wheel is subject to heavy wear from grinding beads and regrind. Sieves are sometimes used to hold back the grinding beads in the grinding gap, but these can hinder and even prevent the regrind discharge if they are clogged with regrind and grinding beads.
  • An annular gap mill known from GB-A-2 131 721 has a rotationally symmetrical inner body composed of several shafts or double-conical areas, so that several equatorial zones of larger diameter are formed from the inlet to the outlet.
  • the inner contour of the grinding container is designed such that it essentially follows the outer contour of the inner body, and the inner body is axially displaceable relative to the grinding container, so that the grinding gap can be changed. Alternately wider and narrower areas of the grinding gap can be formed.
  • the annular gap mill is a ball mill in which grinding media (balls) are located in the grinding gap. When the inner body rotates, these balls are lifted by centrifugal force, overcoming the respective equator in order to reach the next higher area of the grinding gap. At the top, they are held back by a grille. This results in a grinding pearl concentration at the upper end of the grinding gap and a grinding pearl deficiency in the lower area.
  • the entire height of the grinding gap is used for the active grinding process of the grinding beads because hydrodynamics and centrifugal force prevent the grinding beads from sinking into the grinding gap, the height of the grinding gap is limited to the lower part of the rotor and grinding container and this results in an undesirable result Performance loss.
  • the aforementioned and advantageous hydrodynamic effect occurs only with a wet grinding, but not with a dry grinding. However, this is often desirable, especially with mineral hard materials, since their finely ground powders are to be processed further in dry form and therefore wet grinding (with subsequent drying and deagglomeration) represents a detour in terms of energy.
  • the invention is therefore based on the object to improve an annular gap mill of the type mentioned in such a way that it enables an economically and technically optimal fine comminution of hard mineral materials in the wet and in the dry state by increasing the output in the grinding gap.
  • the mill according to the invention meets these requirements, and the character of the mill can be determined by the choice of drive:
  • the inner body (as a rotor) must be driven; a hydrodynamic effect then forms in the grinding gap, which, as a result of the upper and lower regions of the inner body and grinding container tapering in opposite directions, and the convex curvature counteracts at least one of the regions of gravity of the grinding beads and the grinding material and prevents their sinking in the grinding gap , while the centrifugal force in the area of the largest diameter prevents the grinding beads from being discharged with the regrind. Without sieves, there is a separation of regrind and grinding beads. Since the rate of ascent of the material to be ground in the grinding gap depends on the one hand on the speed of the inner body, its control can influence the grinding effect.
  • the residence time of the slip in the grinding gap depends on the grinding material conveying speed and can be regulated by controlling the feed pump, so that the grinding effect can also be changed in the desired manner by influencing this parameter.
  • the regrind slowly moves upwards in the direction of the discharge due to the rotatingly driven grinding bead belt, and the slurry is narrow due to the long dwell time.
  • the grinding container must be driven (as an external rotor);
  • the grinding beads and grinding material particles in the grinding gap are grasped by the centrifugal force, which, as a result of the upper and lower areas of the inner body and grinding container, which taper in opposite directions, and the convex curvature of at least one of the areas, counteracts the gravity of the grinding balls and the grinding material particles and on the one hand their sinking in the grinding gap prevents, on the other hand, the discharge of the grinding beads through the regrind particles.
  • dry grinding basically gives the same options for controlling the grinding process as for wet grinding. Instead of a slurry feed pump, air flow can be provided.
  • the convex curvature of an area of the mill cross-section tapering in opposite directions can be supplemented by a second convexly curved area or a conical straight area.
  • a convex lower region can also advantageously be combined with an at least partially concave upper region. The concavity of the upper region of the cross section helps to prevent the grinding beads from being driven upwards.
  • the outer surface of the inner body can advantageously be spherically curved in a closed line. Accordingly, the inner surface of the grinding container is spherically curved and a grinding bowl-shaped grinding gap is formed the upper end of which is preferably provided beyond the inner body of the outlet for the ground material. The material to be ground is advantageously fed into the lower apex of the grinding gap.
  • the formation of the inner surface of the inner body and the inner surface of the grinding vessel as an ellipsoid or hyperbolic body and the like can also be realized.
  • the shape of the outer surface of the inner body and the inner surface of the grinding container need not be identical: for example, an elliptical inner body or a spherical inner body that is somewhat flattened in the equatorial zone can be combined with an absolutely spherical inner surface of a grinding container.
  • This difference in the radii of the curvatures of the outer surface of the inner body and the inner surface of the grinding container, in particular in the equator zone favors the restraint of the grinding beads in the aquator zone and intensifies their grinding work due to the large forces prevailing here.
  • the central axis of the inner body can be inclined relative to the central axis of the grinding container. Since the most massive particles, i.e. As a rule, the grinding beads move into an orbit that runs at right angles to the central axis of the driven mill part (inner body or grinding container), this means that, depending on the inclination of the inner body or grinding container, he outlet for the ground material to the highest or one lower point of the grinding gap can be relocated. This distance of the material outlet to the most labor-intensive equator zone of the driven mill part also contributes to preventing the discharge of grinding beads.
  • the inner body or the grinding container is expediently slidably mounted to change the grinding gap width.
  • the displacement takes place, in particular, transversely to the central axis of the inner body and leads to the fact that it stands eccentrically in the grinding container and that one side of the grinding gap is narrower than the opposite side of the same.
  • This has the effect that during the operation of the mill, both millbase and millbeads accumulate in the narrowed grinding gap part, that this build-up prevents millbeads and millbase from moving into a pure tangential movement to the driven mill part and thus increases the work capacity of the mill.
  • a further increase in the performance of the annular gap mill is achieved according to the invention in that both the inner body and the grinding container are rotatably mounted and are provided with a rotary drive.
  • the direction of rotation of the rotating parts can be opposite or in the same direction.
  • the rotating parts rotate in the same direction, they have a speed difference or speed difference, so that the required relative movement occurs.
  • the rotation of the inner body on the inside of the grinding gap and the grinding container on the outside of the grinding gap lead to the fact that the grinding beads are rotated in the grinding gap from two sides and activated for work. In this case, the entire thickness of the grinding bead layer in the grinding gap takes part in the grinding work.
  • the opposite rotation of the two mill parts causes higher shear forces of the grinding beads, and in particular in the zone with the largest diameter, the output can be doubled compared to the embodiment with only one driven mill part.
  • the behavior of the grinding beads in the mill changes insofar as the separation of the grinding beads and thus the prevention of their exit from the mill becomes even more effective.
  • the simultaneous drive of the inner body and grinding container has another significant advantage: the mill can be used for wet or dry grinding without any further modifications.
  • the inner body is driven. If the ground material is to be ground wet (as a slip), the inner body is driven. If the grinding container is left to rest, the normal grinding effect is established; if it is driven in opposite directions, the grinding effect is increased considerably.
  • the grinding container is driven. If the ground material is to be ground dry (as a powder), the grinding container is driven. If the inner body is left to rest, the normal grinding performance is established; if it is driven in opposite directions, the grinding capacity is increased.
  • the performance of the mill can also be increased during oxyacetylene grinding by narrowing the grinding gap on one side.
  • An automatic interval switch is advantageously provided for the inner body and the grinding container, both initially with the same Let the direction of rotation be driven, when the maximum speed is reached the inner body or the grinding bowl can be moved relative to each other until a one-sided grinding gap of approx. 1 mm is reached and at the same time one of the rotating parts switches to counter-rotation, then the moved part into its starting position with the same direction of rotation and then repeat these operations.
  • the inner surface of the grinding container and the outer surface of the inner body have fine-rough surfaces. This means that they should not be particularly smooth, but should not be particularly rough.
  • the fine roughness can be achieved by a suitable coating of the surfaces, which serves as a corrosion and wear protection layer.
  • the inner body can be ventilated on the inside.
  • the grinding container can be surrounded by a cooling liquid jacket or air-cooled.
  • annular gap mill 12 is suspended from a support plate 11 for wet or dry grinding.
  • the annular gap mill 12 consists essentially of a mainly spherical, driven hollow inner body 13 with an upwardly rotating axis of rotation in the form of a hollow shaft 14 and an outer grinding container 15, the inner surface of which is spherical and which has its central axis coaxial with the hollow shaft 14 of the inner body 13 is independently rotatable.
  • the inner body 13 is flattened at 17 by removing a spherical cap section.
  • a straight passage 18 of the tubular hollow shaft 14 opens into this flattening, the lower end 19 of which is screwed into an internally threaded bore of a fitting body 20 in the inner body 13 and the upper end of which has an inlet opening 18a and carries a drive disk 46.
  • the hollow shaft 14 is mounted in a double bearing 16, the bearing housing 21 of which is firmly connected to an adjusting device 22, the task and design of which are explained in detail below.
  • a spherical shell-shaped grinding gap 23 of non-uniform width in the upper and lower region By flattening the inner body 13 in its equatorial zone 24 with the largest diameter and maintaining a perfect spherical shape on the inner surface of the grinding container 15, a partial widening of the grinding gap 23 occurs in the equatorial zone 24, which merges upwards and downwards into gradually narrowing grinding gap parts.
  • the lower, narrower grinding gap section ends in an enlarged opening 25 of the passage 18 of the hollow shaft 14, which is created by the flattening 17 of the inner body 13, while the upper grinding gap section is open to a ring of radial, circumferentially oblique outlet openings 26, which are located in a cylindrical drive housing 27 , which is fixedly connected to the grinding container 15 in order to set it in rotation when a belt inserted in a groove 32 transmits driving force to the drive housing 27.
  • the outlet openings 26 are directed radially and obliquely in the same direction and their inner end near the axis lies opposite a cylindrical projection 28 of the inner body 13, which is covered by a plate 29 and reinforces the exit of the hollow shaft 14 from the inner body 13.
  • the hollow shaft 14 is surrounded by a bush 30 at a distance 30a, the upper end of which protrudes through the support plate 11 and is clamped to it with the aid of a secured nut 41 and which has on its outer circumference inner rings of a double ball bearing 31 which has the drive housing 27 of the grinding container 15 rotatable. Since the drive housing 27 rotates with the grinding container 15, the outlet openings 26 also rotate and spin the finely ground material ra conveyed upward from the grinding gap 23 dial outwards into a box 33, from which it runs through a downward drain collecting duct 34 into a collecting container. The centrifugal force retains the grinding beads in the equatorial zone 24, so that the discharged product is free of grinding beads.
  • the inner body 13, including its cylindrical extension 28 and the passage 18 of the hollow shaft 14, is provided with a corrosion and wear protection layer 35, which advantageously has a fine-rough surface.
  • the inner surface of the grinding container 15 is also provided with such a fine-rough lining 36, which extends into the region of the outlet openings 26 on the inner surface of the drive housing 27.
  • the grinding container 15 is divided centrally in a horizontal plane.
  • the upper and the lower half of the grinding container 15 are screwed together via matching flanges 37, 38.
  • an opening 39 is formed in the region of the mouth space 25, which can be closed with the aid of a screw cap 40 and the outlet e.g. of cleaning fluid.
  • the annular gap mill shown in FIG. 1 can work with an inner body 13 arranged centrally in the grinding container 15. However, for fine grinding certain hard materials, it may be more favorable to move the inner body 13 eccentrically in the grinding container 15, specifically coaxially or preferably transversely to its hollow shaft 14. The transverse displacement of the inner body 13 is possible in the region of the oversize 30a of the bore of the bush 30 with respect to the outer diameter of the hollow shaft 14 and the adjustment device 22 mentioned, which is illustrated in FIG. 2 in a top view, is used to carry it out.
  • the adjusting device 22 consists essentially of a two-track carriage 42 with a dovetail profile, which is connected via a holder 43 to the bearing housing 21 of the ball bearing 16, which is screwed through bushings between an annular shoulder 44 on the hollow shaft 14 and one screwed onto an external thread on the hollow shaft 14 secured nut 45 is clamped.
  • the two parallel side parts of the carriage 42 can each be displaced in a parallel guide 46 which is firmly connected to the support plate 11.
  • transverse threaded bolts 47 (FIG. 2), which engage through the parallel guide 46 on the oblique profile of each side part of the carriage 42.
  • the displacement of the inner body 13 transversely to its axis of rotation with the aid of the adjusting device 22 leads to the perpendicular central axis of the inner body 13 being displaced transversely to the central axis of the grinding container 15 by the piece a indicated in FIG. 2, as a result of which the grinding gap 23 on one side receives a constriction 23a and has a widening 23b on the opposite side.
  • the ground material introduced with the grinding beads through the upper coaxial opening 18a of the passage 18 into the mouth space 25 and thus into the grinding gap 23 in the constriction 23a, which in practice e.g.
  • the effectiveness of the grinding process can also be almost doubled if the inner body 13 and the grinding container 15 rotate in opposite directions and in this way an increase in the shear forces of the material to be ground and the grinding beads is brought about.
  • FIG. 3 shows an annular gap mill for dry grinding in the diagram, the basic principle of which corresponds essentially to that of the annular gap mill according to FIG. 1.
  • an indicated cylindrical bush 52 is fastened, on which a grinding container 54 with an exactly spherical inner surface is rotatably suspended via a double ball bearing 53.
  • the grinding container 54 is fixedly connected to a drive housing 55 which has a circumferential groove 65 for a drive belt.
  • the drive housing 55 is provided with a ring of radial outlet openings 56 which open into an annular suction channel 57 with a tangential outlet 58 through which the dry, finely ground material is drawn off in the direction of the arrow.
  • the grinding container 54 is divided horizontally so that an approximately spherical inner body 58 can be inserted into the cavity from below after its opening.
  • the inner body 58 has a coaxial passage 59 which merges into a coaxial hollow shaft 60 which has an inlet 59a at its upper end for the material to be ground and grinding beads.
  • the hollow shaft 60 can be connected via a drive disk 49 at its upper end to a drive which rotates the inner body 58 in the direction of the arrow drawn in the region of a double ball bearing 61. This arrow points in a direction opposite to the indicated direction of rotation of the grinding container 54.
  • An adjusting device 62 enables a radial displacement of the inner body 58 with respect on the interior of the grinding container 54 such that the inner body 58 is offset eccentrically to the vertical central axis of the grinding container 54 in the manner shown and the grinding gap 63 is narrower on the left (63a) than on the right (63b).
  • the adjusting device 62 can have a spindle drive 64 of a conventional type, which enables the inner body 58 to be adjusted with millimeter precision, if necessary during the rotation of the parts, ie during the operation of the annular gap mill.
  • the design of the inner body 58 and the grinding container 54 with the components belonging to them essentially corresponds to the embodiment according to FIG. 1.
  • FIG. 4 differs from the examples of FIGS. 1 and 3, inter alia in that the grinding container 74 is non-rotatably connected to a support plate 70 of a stand 71 and thus only the inner body 73 mounted in a double ball bearing 72 rotates.
  • the use of only one rotating part is sufficient in this annular gap mill, because - as the drain collecting channel 75 and the box 77 surrounding the radial outlet openings 76 show - they are preferably used for wet grinding, i.e. is intended for processing slip.
  • the inner body 73 has an approximate pear shape and is approximately spherically convexly curved in the lower region 73a, while its upper region 73b can be conical or even slightly concave.
  • the upper region 73b of the inner body 73 is continued by a shaft 79 which has no passage.
  • the end of the shaft 79 which projects through the support plate 70 is rotatably mounted in a ball bearing 72.
  • a drive pulley 83 at the upper end of the shaft 79 rotates the inner body 73 in the direction of the arrow.
  • the inner surface of the grinding container 74 also has an approximately spherical shape in the lower region and is essentially adapted in the upper region to the course of the tapering of the inner body 73 in this zone.
  • a grinding gap 81 remains between the two parts.
  • a widening of the grinding gap 81 can be provided in the equatorial region, which increases the centrifugal force in this zone and improves the retention of the grinding beads by the outlet openings 76.
  • a concave curvature which may be provided, of the upper area of the inner body 73 and grinding container 74 is used , which arises between a flattened portion of the inner body 73 and the spherical inner surface of the grinding container 74.
  • the perpendicular inner body 73 is radially displaceable with respect to the central axis of the grinding container 74.
  • An adjusting device 82 is used for this purpose, which can correspond to the adjusting device 62 of the example according to FIG. 3.
  • the example according to FIG. 5 differs from the previous examples essentially in that an approximately spherical inner body 90 with a vertical hollow shaft 91 is combined with an at least internally spherical grinding container 92, the central axis 93 of which is at an angle a to the vertical central axis of the hollow shaft 91 is inclined.
  • the grinding container 92 is rotatably mounted on an inclined foot 94 via a double ball bearing 95, the rotary drive being transmitted to it by a belt in a groove 96 in a drive housing 97.
  • the rotation of the grinding container 92 with a spherical inner surface should take place in the direction of the arrow assigned to the grinding container 92.
  • a cylindrical neck part 98 of the grinding container 92 contains a ring of radial outlet openings 99 which convey into a suction channel 100 with a tangential outlet 101.
  • the inclined neck portion 98 has a relatively large clear diameter which is closed by a stationary inclined cover 102 which is attached to a support plate 103 of a stand 104 in a hanging manner.
  • a mechanical seal 105 is arranged between the underside of the cover 102 and the end face of the neck part 98.
  • the inner body 90 is rotated in the direction of the arrow in the opposite direction to the grinding container 92 via a drive belt engaging a drive pulley 106 at the upper end of the hollow shaft 91.
  • the hollow shaft 91 is mounted in a double ball bearing 107, and the double ball bearing 107 is located in a bearing housing 108 which is connected to an adjusting device 109, which enables an eccentric adjustment of the inner body 90 transversely to its axis of rotation in the spherical cavity of the oblique grinding container 92 in this way that one side of the grinding gap 110 becomes narrower than the opposite side.
  • the inclination of the grinding container 92 by the angle a to the vertical has the result that the outlet openings 99, which lie in a plane parallel to the transverse plane AA of the grinding container 92, have lower and higher portions.
  • the outlet for the ground material can be moved to the highest or a lower point of the grinding gap 110.
  • This distance of the material outlet to the most labor-intensive equator zone of the driven mill part also helps to prevent the discharge of grinding beads at.
  • the very finely ground material is moved more or less slowly upwards in the grinding gap 110 and exits into the suction channel 100 without the grinding beads. The effect of improving the reduction in grinding bead abrasion by tilting the grinding container is also achieved when the grinding container is at a standstill.
  • FIG. 6 shows an annular gap mill, in which the axis of rotation of an inner body 111 also forms an angle ⁇ with the center axis of a rotatable grinding container 112.
  • the grinding container 112 is aligned perpendicularly and the inner body 111 is inclined.
  • Grinding container 112 and inner body 110 rotate in double ball bearings 113 and 114, respectively.
  • Their drives are transmitted by motors which engage belts on a drive pulley 115 on the upper end of a hollow shaft 129 of the inner body 111 and on a drive housing 116 on the grinding container 112.
  • the grinding container 112 is mounted vertically on a straight base 117, while the inner body 111 is arranged obliquely in an inclined bearing housing 118, which is attached to a support plate 119 of a stand 120.
  • a ring of radial outlet openings 121 surrounds a cylindrical neck part 122 of the grinding container 112 and through these outlet openings 121 the finely ground slurry obtained by the wet grinding process passes into a drain collecting channel 123 which leads to a collecting container.
  • FIG. 7 shows an annular gap mill in which a bearing housing 132 for the double ball bearing 133 of a vertical hollow shaft 134 of an inner body 135 is fastened on a support plate 131 of a stand 130.
  • the inner body 135 has an approximately elliptical shape with a slight flattening 136 in the equatorial zone of the largest diameter.
  • the lower dome of the elliptical inner body 135 is also flattened at 137, so that an opening space 138 is formed between the flat 137 and the curvature of the completely elliptical inner surface of a grinding container 139.
  • the straight passage 140 of the hollow shaft 134 opens into the mouth space 138, through which dry material and grinding beads to be ground are introduced from above.
  • the grinding container 139 is fixedly connected to a drive housing 142, which contains a double ball bearing 143 and transmits the drive of a motor to the grinding container 139.
  • the grinding container 139 rotates independently of the inner body 135, the axes of rotation of both rotating parts being arranged coaxially.
  • the finely ground material passes through a ring of radial outlet openings 144 into a suction channel 145.
  • a drive disk 146 at the upper end of the hollow shaft 134 transmits the drive of a motor to the inner body 135.
  • FIGS. 1 to 7 are only examples, the components of which are interchangeable, so that annular gap mills for wet or dry grinding of a wide variety of hard materials are produced, which work with a rotatable or fixed grinding container or inner body and whose grinding gap can be narrowed on one side or evenly dimensioned.
  • the speeds of the inner body and grinding container can be adapted to the material to be ground and can be different or the same, as can the directions of rotation.
  • an automatic interval switch it is possible to first have the grinding bowl and the inner body driven with the same direction of rotation, when the maximum speed is reached, to move the inner bowl or the grinding bowl relative to each other until a one-sided grinding gap of approx. 1 mm is reached and at the same time switch the grinding container or the inner body to counter-rotation, then return the grinding container or the inner body in its starting position with the same direction of rotation and then repeat these processes.

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  • Engineering & Computer Science (AREA)
  • Food Science & Technology (AREA)
  • Crushing And Grinding (AREA)
EP86113847A 1985-10-12 1986-10-07 Ringspaltmühle Expired - Lifetime EP0219036B2 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3536440A DE3536440C1 (de) 1985-10-12 1985-10-12 Ringspaltmuehle
DE3536440 1985-10-12

Publications (4)

Publication Number Publication Date
EP0219036A2 EP0219036A2 (de) 1987-04-22
EP0219036A3 EP0219036A3 (en) 1988-08-03
EP0219036B1 EP0219036B1 (de) 1990-06-13
EP0219036B2 true EP0219036B2 (de) 1994-11-02

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EP86113847A Expired - Lifetime EP0219036B2 (de) 1985-10-12 1986-10-07 Ringspaltmühle

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US (1) US4735366A (pt)
EP (1) EP0219036B2 (pt)
JP (1) JPS6287255A (pt)
DE (1) DE3536440C1 (pt)
ZA (1) ZA867706B (pt)

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CA2916325C (en) * 2013-07-22 2021-02-16 Imp Technologies Pty Ltd Adjustable super fine crusher
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DE2811899C2 (de) * 1978-03-18 1984-12-06 Fryma-Maschinen Ag, Rheinfelden Spalt-Kugelmühle
DE3245825C2 (de) * 1982-12-10 1994-01-27 Buehler Ag Geb Rührwerksmühle
DE3431636C1 (de) * 1984-08-29 1985-10-17 Reimbold & Strick GmbH & Co, 5000 Köln Ringspalt-Kugelmuehle

Also Published As

Publication number Publication date
JPH0228377B2 (pt) 1990-06-22
US4735366A (en) 1988-04-05
EP0219036A3 (en) 1988-08-03
EP0219036A2 (de) 1987-04-22
EP0219036B1 (de) 1990-06-13
JPS6287255A (ja) 1987-04-21
DE3536440C1 (de) 1987-03-26
ZA867706B (en) 1987-06-24

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