EP3626350A2 - Broyeur à boulets à agitateur et procédé de fonctionnement d'un broyeur à boulets à agitateur - Google Patents

Broyeur à boulets à agitateur et procédé de fonctionnement d'un broyeur à boulets à agitateur Download PDF

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Publication number
EP3626350A2
EP3626350A2 EP19193548.5A EP19193548A EP3626350A2 EP 3626350 A2 EP3626350 A2 EP 3626350A2 EP 19193548 A EP19193548 A EP 19193548A EP 3626350 A2 EP3626350 A2 EP 3626350A2
Authority
EP
European Patent Office
Prior art keywords
grinding
regrind
ball mill
outlet
shaft
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.)
Pending
Application number
EP19193548.5A
Other languages
German (de)
English (en)
Other versions
EP3626350A3 (fr
Inventor
Udo Enderle
Claus Simon
Sergio Soria
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.)
Netzsch Feinmahltechnik GmbH
Original Assignee
Netzsch Feinmahltechnik 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
Application filed by Netzsch Feinmahltechnik GmbH filed Critical Netzsch Feinmahltechnik GmbH
Publication of EP3626350A2 publication Critical patent/EP3626350A2/fr
Publication of EP3626350A3 publication Critical patent/EP3626350A3/fr
Pending 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
    • 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
    • B02C17/02—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 with perforated container
    • 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
    • B02C17/10—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 with one or a few disintegrating members arranged in the container
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
    • B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
    • B02C17/00—Disintegrating by tumbling mills, i.e. mills having a container charged with the material to be disintegrated with or without special disintegrating members such as pebbles or balls
    • B02C17/16—Mills in which a fixed container houses stirring means tumbling the charge
    • B02C17/163—Stirring means
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
    • B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
    • B02C17/00—Disintegrating by tumbling mills, i.e. mills having a container charged with the material to be disintegrated with or without special disintegrating members such as pebbles or balls
    • B02C17/18—Details
    • B02C17/181—Bearings specially adapted for tumbling mills
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
    • B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
    • B02C17/00—Disintegrating by tumbling mills, i.e. mills having a container charged with the material to be disintegrated with or without special disintegrating members such as pebbles or balls
    • B02C17/18—Details
    • B02C17/183—Feeding or discharging devices
    • B02C17/1835—Discharging devices combined with sorting or separating of material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
    • B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
    • B02C17/00—Disintegrating by tumbling mills, i.e. mills having a container charged with the material to be disintegrated with or without special disintegrating members such as pebbles or balls
    • B02C17/18—Details
    • B02C17/183—Feeding or discharging devices
    • B02C17/186—Adding fluid, other than for crushing by fluid energy
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
    • B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
    • B02C17/00—Disintegrating by tumbling mills, i.e. mills having a container charged with the material to be disintegrated with or without special disintegrating members such as pebbles or balls
    • B02C17/18—Details
    • B02C17/183—Feeding or discharging devices
    • B02C17/186—Adding fluid, other than for crushing by fluid energy
    • B02C17/1875—Adding fluid, other than for crushing by fluid energy passing gas through crushing zone
    • B02C17/1885—Adding fluid, other than for crushing by fluid energy passing gas through crushing zone the applied gas acting to effect material separation
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
    • B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
    • B02C17/00—Disintegrating by tumbling mills, i.e. mills having a container charged with the material to be disintegrated with or without special disintegrating members such as pebbles or balls
    • B02C17/18—Details
    • B02C17/24—Driving mechanisms
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
    • B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
    • B02C17/00—Disintegrating by tumbling mills, i.e. mills having a container charged with the material to be disintegrated with or without special disintegrating members such as pebbles or balls
    • B02C17/18—Details
    • B02C17/183—Feeding or discharging devices
    • B02C17/1835—Discharging devices combined with sorting or separating of material
    • B02C17/184—Discharging devices combined with sorting or separating of material with separator arranged in discharge path of crushing zone
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B07—SEPARATING SOLIDS FROM SOLIDS; SORTING
    • B07B—SEPARATING SOLIDS FROM SOLIDS BY SIEVING, SCREENING, SIFTING OR BY USING GAS CURRENTS; SEPARATING BY OTHER DRY METHODS APPLICABLE TO BULK MATERIAL, e.g. LOOSE ARTICLES FIT TO BE HANDLED LIKE BULK MATERIAL
    • B07B7/00—Selective separation of solid materials carried by, or dispersed in, gas currents
    • B07B7/08—Selective separation of solid materials carried by, or dispersed in, gas currents using centrifugal force
    • B07B7/083—Selective separation of solid materials carried by, or dispersed in, gas currents using centrifugal force generated by rotating vanes, discs, drums, or brushes

Definitions

  • the present invention relates in particular to a horizontal agitator ball mill and to a method for operating such an agitator ball mill according to the features of the independent claims.
  • the present invention relates in particular to a horizontal agitator ball mill for grinding dry product.
  • An agitator ball mill is a machine for coarse, fine and very fine comminution or homogenization of regrind.
  • An agitator ball mill consists of a non-rotatable grinding container with an agitator shaft, which is usually arranged axially parallel and in the center, a bearing and a drive unit.
  • the grinding container is usually cylindrical and usually filled to 70% to 90% with grinding media.
  • An agitator is provided within the grinding container, which is composed of a rotatably mounted stirring shaft with stirring elements arranged thereon and ensures intensive movement of the grinding elements.
  • Known agitator ball mills are fed through a central opening in one of the end walls.
  • the product can also be admitted directly radially or tangentially via the grinding cylinder.
  • the regrind is continuously conveyed into and through the grinding chamber.
  • the solids are crushed or dispersed between the grinding media by impact and shear forces.
  • the discharge of the finished product depends on the design and takes place, for example, at the end of the mill.
  • the axial product transport in the grinding cylinder can be carried out solely by gravitational forces.
  • the product is conveyed through the grinding cylinder by means of a fluid, which is preferably designed as a transport air stream, the grinding media in the grinding chamber of the agitator ball mill when the product and the fluid are discharged from the agitator ball mill should remain.
  • a fluid which is preferably designed as a transport air stream
  • the grinding media in the grinding chamber of the agitator ball mill when the product and the fluid are discharged from the agitator ball mill should remain. This is achieved in particular by deliberately separating the grinding media inside the agitator ball mill, for example by using a suitable separating device.
  • an agitator ball mill with an overhung rotor The rotor has an axis of rotation and is overhung on a bearing, from which along the axis of rotation A a free, in the following unsupported rotor end is defined.
  • a multiplicity of stirring elements arranged at a distance from one another are provided on the stirring shaft, by means of which the grinding bodies located in the grinding chamber of the stirred ball mill are set in rotation.
  • a gap is formed between the rotor end face and the opposite rotor side or the housing as a stator. As soon as the regrind has been ground, it can enter the regrind outlet via the gap and thus leave the grinding chamber.
  • the end which is mounted on the fly is arranged at the regrind outlet and the end on the bearing side is arranged at the regrind inlet.
  • the grinding media may also leave the grinding chamber as such through the gap.
  • an agitator ball mill with a separating device which is arranged in front of the regrind outlet.
  • the separating device comprises a stationary sieve unit, through which at least particles of at least one component of the product / grinding media mixture can pass up to a certain diameter.
  • the separating device further comprises a classifying rotor which has a support plate with coupled attachments rigidly seated on the agitator shaft of the agitator ball mill. The attachments form a rotor cage, which rotates around the sieve unit arranged in a fixed position in front of the regrind outlet.
  • the rotor cage with the attachments helps to protect the sieve unit from the grinding media located in the grinding chamber and to effect a certain flow behavior of the product / fluid mixture in the region of the sieve unit.
  • a comparatively similar agitator ball mill is due to the DE 10 2012 013 279 A1 disclosed.
  • the invention is therefore based on the object of providing an agitator ball mill and a method for operating an agitator ball mill in which the regrind discharge can be improved compared to the known solutions and in which the wear on the sieve unit is reduced and the compaction of the grinding media located in the grinding chamber can be prevented.
  • the invention proposes an, in particular horizontal, agitator ball mill with an in particular cylindrical grinding container which has a grinding material inlet and a grinding material outlet.
  • the regrind inlet is provided on a first end region of the grinding container and the regrind outlet is formed on an opposite second end region of the grinding container.
  • a vacuum can preferably prevail in the grinding container or in the grinding chamber with respect to the atmosphere, which vacuum can be generated and adjusted by means of corresponding vacuum pumps, suction fans or the like.
  • the grinding container or the grinding chamber can preferably be filled to 70% to 90% with grinding media which are spherical, for example.
  • the grinding media can also have any other shape.
  • the grinding media are used to shred the material fed in through the grist inlet Grist is essential and acts as a grinding tool.
  • the grinding media can preferably be made smaller than 20 mm, in particular smaller than 12 mm.
  • the agitator ball mill comprises a shaft which can be rotated in the grinding container or in the grinding chamber by means of a drive unit, which shaft is designed at least in sections as a stirring shaft and is equipped with stirring elements.
  • the shaft can extend at least in sections along the longitudinal extent of the grinding container and into the grinding material inlet and / or in the grinding material outlet.
  • the drive unit of the agitator shaft can preferably be arranged on the second end region of the grinding container with the grinding material outlet or on the side of the grinding material outlet.
  • the agitator shaft preferably comprises a multiplicity of agitator elements, which are each arranged at an even distance from one another.
  • the stirring elements can extend radially from an outer circumferential surface of the stirring shaft, a distance between a free end of the stirring elements and an inner circumferential surface of the grinding container, preferably completely, being at least two and a half times the diameter of the grinding elements.
  • the distance between the free end of the stirring elements and the inner surface of the grinding container can also be referred to as the grinding gap.
  • the stirring elements can preferably be secured against rotation on an outer lateral surface of the stirring shaft.
  • the stirring elements can preferably be fastened to the outer circumferential surface of the stirring shaft by means of a positive and / or positive connection.
  • the stirring elements can serve to set the grinding media located in the grinding chamber in motion and thus to provide them with energy which is used to comminute the grinding stock supplied via the grinding stock inlet.
  • the grinding media can be set in motion in so-called grinding zones, which grinding zones are each defined as the space between two stirring elements.
  • the ground material to be ground fed through the ground material inlet can pass through these grinding zones and can be comminuted on the way from the ground material inlet to the ground material outlet.
  • a flow can be established by feeding in the ground material to be ground and removing the finished ground material.
  • the stirring elements can, for example, in the form of Disks such as solid disks, perforated disks with or without axial or radial elevations, pins or other elements can be formed.
  • the agitator ball mill comprises a separating device, which is preferably arranged in front of the ground material outlet.
  • the separating device comprises a classifying rotor, which is arranged on the agitator shaft axially spaced from the regrind outlet and has a rotatable rotor cage.
  • the rotor cage can contribute to the grinding bodies located in the area of the separating device being moved radially in the direction of the inner wall of the grinding container and / or being thrown.
  • the separating device comprises a sieve unit arranged within the rotor cage and fastened to the classifying rotor.
  • the sieve unit By fastening the sieve unit to the classifying rotor, the sieve unit is designed to rotate.
  • the screening unit can rotate together with the rotor cage, i.e. the rotor cage and the sieve unit can rotate at the same speed, since the speed of the rotor cage can be transferred to the sieve unit.
  • the finished ground material with a certain diameter and, alternatively, also a fluid flow such as, for example, a first fluid flow or at least a part of the first fluid flow, can consequently leave the grinding container or grinding chamber via the sieve unit, in which it enters the grinding material outlet while the The grinding media remain or are retained in the grinding container or in the grinding chamber.
  • a fluid flow such as, for example, a first fluid flow or at least a part of the first fluid flow
  • the sieve unit rotating with the rotor cage, it advantageously results that the grinding media do not rigidly compact between the sieve unit and the inner wall of the grinding container. Instead, the grinding media are kept in motion loosened and flung radially towards the inner wall of the grinding container. As a result, wear and / or damage to the sieve unit can be reduced at the same time.
  • the rotor cage with the sieve unit attached to it can be driven via the agitator shaft, so that the rotor cage with the sieve unit and the agitator shaft are driven at the same speed.
  • torque transmission devices or the like can be provided, for example, by means of which a torque of the shaft or agitator shaft is transmitted to the rotor cage can be.
  • a separate drive unit can be assigned to the rotor cage, so that the rotor cage with the sieve unit can be driven independently of the agitator shaft, ie the rotor cage with the sieve unit attached to it and the agitator shaft can be driven or operated at different or the same speeds.
  • the sieve unit can, for example, be conical or star-folded-conical.
  • An inside diameter of the sieve unit can increase in the direction of the regrind outlet, a maximum inside diameter being less than 95% of the inside diameter of the grinding container. Due to the conical shape of the sieve unit, a large sieve surface, but in particular also a large passage area in the area of the support plate of the classifying rotor, can be provided for the finished ground material.
  • the sieve unit can be designed in any other form that appears to be suitable for use in the agitator ball mill according to the invention.
  • the rotor cage comprises a flange with a support plate, which is seated on the agitator shaft, i.e. it can be provided that a diameter of the classifying rotor increases in the direction of the grinding chamber outlet.
  • the support plate can in particular be an end face of the classifying rotor with the smallest diameter of the classifying rotor.
  • At least two rotor fingers can be attached to the support plate.
  • at least three, four or five or more rotor fingers can also be attached to the support plate.
  • the at least two rotor fingers are each mechanically, preferably releasably attached to the support plate, so that they can be replaced if necessary.
  • the at least two rotor fingers are each arranged at least approximately on the outer circumference of the support plate.
  • the rotor cage is formed by the support plate with the at least two rotor fingers attached to it.
  • the at least two rotor fingers can be of equal length in the longitudinal direction, wherein a diameter and / or a width and / or a height of the at least two rotor fingers can increase along the longitudinal extent thereof or is identical.
  • at least one ring element at the free end of the at least two rotor fingers for example in the form of a disc.
  • the at least one ring element can comprise a centrally arranged bore, the inside diameter of which is larger than an outside diameter of the shaft or agitator shaft.
  • An outer diameter of the at least one ring element can be designed to be larger or corresponding to at least one diameter or a distance between the at least two rotor fingers.
  • the rotor cage is assigned a stationary base which is arranged on an inside of the second end region of the grinding container.
  • the stationary base can be, for example, a circular or tubular element which / which protrudes into the grinding chamber at least in sections.
  • the stationary base can protrude at least approximately vertically from an inside of the second end region of the grinding container into the grinding chamber, i.e. the stationary base can extend at least in sections parallel to the shaft, in particular to the classifying rotor.
  • the rotor cage in particular the free end of the at least two rotor fingers or the end face of the at least one ring element pointing towards the regrind outlet, can preferably be arranged, in particular at a distance, from the stationary base such that a distance or a gap is less than 0.5 times, preferably is less than 0.3 times the diameter of the grinding media. Due to the spacing formed, it can be prevented that ground material and / or grinding bodies that have not been completely ground get into the ground material outlet and clog it and / or damage the sieve unit.
  • the classifying rotor has a smaller diameter in the area of the support plate than in the area of the ring element.
  • the sieve unit is fixed to the support plate of the flange.
  • the sieve unit can be non-positively, positively and / or materially attached to the support plate, preferably releasably, ie the sieve unit can be replaced in a simple manner when worn.
  • a torque of the rotor cage can be transmitted to the sieve unit, ie the rotor cage and the sieve unit can rotate together, especially at the same speed. Consequently, the rotor cage can thus act as a kind of torque transmission device.
  • the sieve unit can comprise a plurality of openings.
  • the openings can have a round, oval, angular or irregular cross section.
  • the openings can preferably be designed in the form of axial elongated holes.
  • the size of the openings of the sieve unit should be chosen so that the openings are each smaller than 70% of the diameter of the grinding media, i.e. the openings can have a maximum of 0.7 times the opening width of the grinding media diameter and / or grinding media height and / or the grinding media length. In this way, grinding media can be prevented from getting into the grist outlet.
  • the sieve unit has a smaller enveloping outer diameter on the side facing the regrind inlet than on the side facing the regrind outlet or the bearing-side boundary of the grinding chamber.
  • a regrind inlet space is arranged upstream of the regrind inlet.
  • the regrind inlet space can open into a regrind inlet downstream of the regrind inlet space.
  • the regrind inlet can be designed, for example, in the form of an opening in the first end region of the grinding container.
  • a regrind outlet space is spatially arranged downstream of the regrind outlet, i.e. the regrind outlet can open into a regrind outlet space downstream of the regrind outlet.
  • the regrind outlet can be designed, for example, in the form of an opening in the second end region of the grinding container.
  • the regrind outlet space can open into a collecting container, so that the ground regrind can be collected and stored temporarily until further handling.
  • the regrind inlet space can be part of the regrind inlet and the regrind outlet space can be part of the regrind outlet. Therefore, if there is talk before and afterwards, The fact that the shaft protrudes into the regrind inlet and / or the regrind outlet at least in sections should also include or should not be excluded that the shaft can also extend into the regrind inlet space and / or into the regrind outlet space.
  • the regrind outlet can be arranged at least in sections parallel and / or perpendicular to the shaft.
  • an opening can be provided in the second end region of the grinding container, which at least in sections runs parallel and / or perpendicular to the shaft, i.e. the regrind outlet can be arranged below and / or above the center of the shaft or the center of the shaft and can extend downwards and / or laterally.
  • the shaft arranged in the grinding container extends at least in sections into the grinding material inlet space and / or into the grinding material outlet space.
  • the shaft extending into the ground material inlet space can be designed at least in sections as a first screw conveyor, in particular as a first screw spiral. This enables the regrind to be transported continuously or as required into the grinding chamber. At the same time, clogging of the regrind inlet with glued and / or clumped regrind can be at least largely counteracted.
  • the shaft within the sieve unit and / or within the regrind outlet and / or within the regrind outlet space is designed at least in sections as a second screw conveyor, in particular as a second screw spiral.
  • the finished ground material can thus be conveyed at least in sections along the ground material outlet to the ground material outlet space in order to prevent the ground material outlet from becoming blocked.
  • a vertical grinding chamber arrangement is known in the case of dry reverse ball mills, but has the problem that the grinding bodies are compacted by gravity in the lower region of the grinding cylinder and prevent product transport. Mill designs with a separation of the product / grinding media mixture outside the grinding chamber have the disadvantage that grinding media with the product have to be fed in and out permanently, which reduces the energy efficiency of the grinding circuit. It is therefore envisaged that the Grinding container is arranged horizontally.
  • the shaft is mounted on the fly in the grinding container.
  • the regrind inlet can be arranged on the flying end of the shaft and the regrind outlet on the bearing end of the shaft.
  • the flying end can preferably be arranged on the first end region and the bearing-side end of the shaft on the second end region of the grinding container.
  • an inverted bearing of the flying shaft would also be conceivable, according to which the end with a floating bearing is arranged at the regrind outlet and the end on the bearing side at the regrind inlet.
  • a first fluid inlet opening is assigned to the regrind inlet and / or the regrind inlet space, via which a first fluid flow such as, for example, a first air volume flow or an inert or reactive gas can be fed into the regrind inlet or regrind inlet space and thus into the grinding chamber of the grinding container is or is fed.
  • the first fluid flow can be fed into the regrind inlet or into the regrind inlet space in such a way that it mixes with the regrind and a first regrind fluid flow is formed.
  • the first fluid flow can thus serve as a transport flow and carry the regrind from the regrind inlet or from the regrind inlet space into the grinding chamber.
  • At least a part of the first fluid flow also flows along the grinding chamber and carries the ground material to be ground there and / or the finished ground material to the ground material outlet. In this way, part of the first fluid flow can also leave the grinding chamber via the grinding material outlet together with the ground material.
  • a second fluid inlet opening is assigned to the regrind outlet and / or the regrind outlet space, so that a second fluid flow, for example a second air volume flow or an inert or reactive gas, can be supplied to the regrind outlet or the regrind outlet space.
  • the second fluid flow can be fed into the millbase outlet or the millbase outlet space such that it mixes with the finished millbase and a second millbase fluid stream is formed.
  • the second fluid flow can serve to carry and transport the finished ground material along the material outlet.
  • the tubular element comprises channels and / or bores through which the second fluid flow can flow.
  • the channels and / or bores of the tubular element can be a third fluid inlet opening, through which a third fluid flow such as, for example, a third air volume flow or an inert gas or the like can flow.
  • the third fluid flow can leave the grinding chamber in particular via the grinding material outlet.
  • the second and / or third fluid flow can preferably be flushed through the distance or gap formed between the stationary base and the rotor fingers, so that no or barely fully ground material can penetrate into the gap.
  • the second and / or the third fluid flow can act as a rinsing fluid, by means of which the sieve unit can be cleaned and blown out.
  • the first, second and / or third fluid flow can each be generated by a separate or external fluid source such as, for example, a separate or external air source or by a common external fluid source such as by a common external air source or the like.
  • a separate or external fluid source such as, for example, a separate or external air source or by a common external fluid source such as by a common external air source or the like.
  • At least one control element is assigned to the first and / or second and / or third fluid inlet opening, so that the first and / or second and / or the third fluid flow are regulated can.
  • a cross section of the first and / or second and / or third fluid inlet opening can be varied by means of the control element, as a result of which the first and / or second and / or third fluid inlet opening are adjusted.
  • the at least one control element can be set such that the negative pressure prevailing in the grinding chamber remains.
  • the first fluid flow flowing through the regrind inlet is greater than 50% of the total fluid flow, wherein in particular the entire fluid flow can be composed of the first, second and / or third fluid flow.
  • the second and / or third fluid flow which flows through the stationary base and the distance formed between the stationary base and the rotor fingers, is designed to be less than 25% of the total fluid flow.
  • the invention further comprises a method for operating a previously described agitator ball mill.
  • the agitator ball mill comprises a grinding container which has a first end region with a grinding material inlet and a second end region with a grinding material outlet.
  • the agitator ball mill comprises a shaft which can be rotated in the grinding container or in the grinding chamber by means of a drive unit, which shaft is designed at least in sections as a stirring shaft and is equipped with stirring elements.
  • a separating device which is preferably arranged axially to the grinding material outlet.
  • the separating device comprises a classifying rotor, which is arranged on the agitator shaft axially spaced from the regrind outlet and has a rotatable rotor cage.
  • a sieve unit is arranged inside the rotor cage and attached to the classifying rotor. When the classifying rotor is activated, the rotor cage is set in rotation. Since the sieving unit is attached to the classifying rotor and in particular to the rotor cage, a torque of the rotor cage is transmitted to the sieving unit, so that the rotor cage and sieving unit rotate together at the same speed.
  • the rotation of the rotor cage is used to ensure that the grinding media located in the grinding container or in the grinding chamber are thrown radially in the direction of the inner wall of the grinding container, while this is done ground regrind can reach the regrind outlet via the sieve unit.
  • This separation and transport function is particularly supported when the grinding media have a higher specific weight than the product to be ground, since then the finished ground material, due to the difference in density, inwardly escapes through the sieve into the ground material outlet.
  • FIG 1 shows a schematic view of a longitudinal section of an embodiment of the agitator ball mill 10 according to the invention.
  • the agitator ball mill 10 comprises a grinding container 12 which is cylindrical and is mounted horizontally. A negative pressure prevails in the grinding container 12 or in the grinding chamber 18, which is set by a suitable vacuum pump or the like not shown here in the grinding container 12 or in the grinding chamber 18.
  • the grinding container 12 has a grinding material inlet 14 and a grinding material outlet 16, which are formed by corresponding openings in the grinding container 12.
  • the ground material inlet 14 is at a first end region of the grinding container 12 (on the left in FIG Figure 1 ) and the regrind outlet 16 is at an opposite second end region (right in the Figure 1 ) intended.
  • a regrind inlet space 68 is spatially upstream of the regrind inlet 14 (cf. Figure 2 ).
  • a regrind outlet space 70 is spatially arranged downstream of the regrind outlet 16 (cf. Figure 3 ).
  • the grist inlet space 68 is an area of the regrind inlet 14 and in the regrind outlet space 70 around a region of the regrind outlet 16.
  • the grinding container 12 is preferably 70% to 90% filled with grinding media, which are preferably spherical, but can also be cylindrical, for example.
  • the grinding media are essential for the grinding of the grinding material supplied via the grinding material inlet 14 and act as a grinding tool.
  • the grinding media are preferably smaller than 12 mm.
  • the agitator ball mill 10 comprises a shaft 20 which is rotatable by means of a drive unit (not shown here) and which is arranged in the grinding container 12.
  • the drive unit of the rotatable shaft 20 is preferably located in the region of the grinding material outlet 16 or at the second end region of the grinding container 12.
  • the shaft 20 is overhung, the bearing end of the shaft 20 being arranged in the region of the regrind outlet 16 or regrind outlet space 70 and the flying end of the shaft 20 in the region of the regrind inlet 14 or regrind inlet space 68, i.e. the shaft 20 extends at least along the longitudinal extent of the milling container 12 from the milling material inlet space 68 or milling material inlet 14 to the milling material outlet space 70 or milling material outlet 16.
  • the rotatable shaft 20 is formed at least in sections as a stirring shaft 22 and equipped with stirring elements 24.
  • the stirring elements 24 each extend radially from an outer lateral surface of the stirring shaft 22, the stirring elements 24 each being secured against rotation, in particular mechanically, to the outer lateral surface of the stirring shaft 22.
  • the stirring elements 24 are arranged at a uniform distance from one another on the outer circumferential surface of the stirring shaft 22.
  • the stirring elements 24 are designed as pins 25. However, it would also be conceivable to design the stirring elements 24 in the form of grinding disks or the like.
  • the stirring elements 24 each serve to set the grinding media located in the grinding chamber 18 in motion and thus to provide them with energy which is used to comminute the grinding stock supplied via the grinding stock inlet 14.
  • the grinding media are in so-called Grinding zones set in motion, which grinding zones are defined as the space between two pins.
  • the ground material to be ground supplied via the ground material inlet 14 passes through these grinding zones and is comminuted on the way from the ground material inlet 14 to the ground material outlet 16. By supplying the ground material to be ground and removing the finished ground material, the flow of the ground material from the ground material inlet 14 in the direction of the ground material outlet 16 is established.
  • the stirring elements 24 each have a free end 26, which is arranged at a distance from an inner wall 28 of the grinding container 12.
  • the first distance A 1 between the free end 26 of the stirring elements 24 and the inner wall 28 of the grinding container 12 corresponds to at least two and a half times the average diameter of the grinding media.
  • the first distance A 1 between the free end and the inner wall 28 of the grinding container 12 is therefore necessary so that the grinding media can pass through this area unhindered without compressing and / or sticking, as would otherwise be the case when the distance between the free end was too small the stirring element and inner wall 28 of the grinding container 12 would be the case.
  • a separating device 30 is provided, which separating device 30 is preferably arranged axially in front of the grinding material outlet 16 is.
  • the separating device 30 comprises a classifying rotor 32, which is arranged on the agitator shaft 22 at an axial distance from the regrind outlet 16 and has a rotatable rotor cage 34.
  • the rotor cage 34 has a flange 36 seated on the agitator shaft 22 with a support plate 38 (cf. Figure 3 ). From the Figure 1 or based on the in Figure 1
  • the flange 36 shown shows that the diameter of the classifying rotor 32 increases in the direction of the grist outlet 16.
  • a smallest diameter of the classifying rotor 32 is formed by the support plate 38 of the flange 36.
  • At least two rotor fingers 40 are mechanically coupled on the outer circumference of the support plate 38.
  • the rotor fingers 40 are of the same size or of the same length in the longitudinal direction, their radial extent preferably changing over their length, ie a diameter of the rotor fingers 40 increases along its longitudinal extent. It can apply that a first diameter D 1 of the rotor finger 40 is smaller than the second diameter D 2 of the rotor finger 40.
  • the rotor fingers 40 extend from the support plate 38 in the direction of the grist outlet 16.
  • At the free end of the rotor fingers 40 at least one ring element 44 in the form of a disk 46 is provided.
  • the disk 46 comprises a centrally arranged bore, the inside diameter of which is larger than an outside diameter of the shaft 20 or the agitator shaft 22.
  • An outer diameter of the disk 46 preferably corresponds to the diameter or distance between the at least two rotor fingers 40.
  • a largest diameter of the classifying rotor 32 is formed by the disk 46.
  • the separating device 30 comprises a sieve unit 42 arranged inside the rotor cage 34 and fastened to the classifying rotor 32, via which the ground material can leave the grinding chamber 18 and the grinding media are retained in the grinding chamber 18. Because the sieve unit 42 is attached to the classifying rotor 32, the rotor cage 34 with the sieve unit 42 attached to it rotates at the same speed as the agitator shaft 22. The rotational movement of the rotor cage 34 generates flows and forces, so that the grinding media radially in the direction of the inner wall 28 of the Grinding container 12 are moved or spun. In this way, the area around the grist outlet 16 is kept clear of the grinding media.
  • the sieve unit 42 comprises a plurality of openings, not shown here.
  • the openings are preferably designed in the form of axial elongated holes.
  • the elongated holes each have a cross section smaller than the grinding media, so that only the finished ground material can pass through the openings of the sieving unit 42, while the grinding media remain in the grinding chamber 18.
  • the openings have a cross section which is less than 70% of the diameter of the grinding media.
  • the sieve unit 42 is conical and is arranged within the rotor cage 34 such that an outer diameter of the sieve unit 42 increases in the direction of the grist outlet 16, a maximum outer diameter of the sieve unit 42 being smaller than 95% of the inner diameter of the grinding container.
  • the conical shape of the sieve unit 42 provides a large surface area, in particular a large passage area for the finished ground material.
  • the screen unit 42 can, for example, increase the surface area consist of a star-shaped folded sieve plate, the outer envelope surface of which is conical.
  • the front side of the sieve unit 42 facing the support plate 38 preferably has two webs 48, 48 ′ which are mechanically fixed to the support plate 38. In this way, the sieve unit 42 is fixed to the support plate 38.
  • the attachment of the screen unit 42 via the two webs 48, 48 'to the support plate 38 can act as a kind of torque transmission device, i.e. when the rotor cage 34 is set in rotation, a torque of the rotor cage 34 is automatically transmitted to the sieving unit 42, i.e. the sieving unit 42 rotates automatically at the same speed as the rotor cage 34.
  • the rotor cage 34 is also assigned a stationary base 50, which is arranged on an inside of the second end region of the grinding container 12.
  • the stationary base 50 is a circular element or tubular element 52 which projects at least in sections perpendicularly from the second end region of the grinding container 12 into the grinding chamber 18.
  • the circular or tubular element 52 has a bore through which the shaft 20 is guided.
  • An axial, second distance A 2 or gap is formed between the free end or end face of the circular or tubular element 52 and the disk 46, which is preferably less than 0.3 times the diameter of the grinding media, ie the second Distance A 2 or gap is formed in such a way that no grinding media and / or ground material that has not been completely ground get into the grinding material outlet 16 without authorization.
  • FIG 2 shows a schematic detailed view of the regrind inlet 14 from the in Figure 1 shown agitator ball mill 10.
  • the ground material to be ground is stored in a storage container 72 which is funnel-shaped and is connected to the ground material inlet 14 via a ground material inlet space 68.
  • a slide 74 is provided at the lowest point of the storage container 72 in order to feed the regrind stored in the storage container 72 via the regrind inlet space 68 to the regrind inlet 14 into the grinding chamber 18.
  • the regrind is fed to the regrind inlet 14 by means of gravity.
  • the regrind inlet 14, in particular the regrind inlet space 68 is a first one Associated with fluid inlet opening 54, via which a first fluid flow 56 (represented by arrows), such as a first air volume flow, is fed into the grist inlet 14 and thus into the grinding chamber 18.
  • a first fluid flow 56 (represented by arrows), such as a first air volume flow, is fed into the grist inlet 14 and thus into the grinding chamber 18.
  • the first fluid flow 56 can mix with the regrind, so that a first regrind fluid flow, in particular a first regrind air volume flow, is formed.
  • the first fluid flow 56 is metered in such a way that the negative pressure prevailing in the grinding container 12 or in the grinding chamber 18 is not impaired, but is sufficient for transporting the ground material into the grinding container 12.
  • the first fluid flow 56 is generated via an external fluid source, not shown here, such as an air source.
  • the first fluid inlet opening 54 comprises at least one control element, not shown here, so that the first fluid flow 56 can be metered or regulated.
  • a cross section of the first fluid inlet opening 54 can be changed by means of the at least one control element.
  • the shaft 20 protruding into the millbase inlet 14, in particular into the millbase inlet chamber 68 is designed at least in sections as a first screw conveyor 58, in particular as a first screw spiral 66.
  • FIG. 3 is a schematic detailed view of the regrind outlet 16 with the separating device 30 arranged in front of it in FIG Figure 1 agitator ball mill shown 10.
  • the shaft 20 projecting inside the sieve unit 42 and into the regrind outlet 16 is at least partially configured as a second screw conveyor 64, in particular as a second screw spiral 67.
  • the ground material which has been let through and is ground through the sieve unit 42 is thus moved and conveyed by the sieve unit 42 along the ground material outlet 16 or out of the ground material outlet 16.
  • the regrind outlet 16 extends at least in sections parallel above and / or below the shaft 20, in particular to the second screw conveyor 64, and opens into a spatially downstream of the regrind outlet 16 Grist outlet space 70.
  • the grist outlet space 70 is connected to a collecting container (not shown here) for the finished ground material.
  • a second fluid inlet opening 60 is assigned to the millbase outlet 16, in particular the millbase outlet space 70, via which a second fluid flow 62 (represented by arrows), for example a second air volume flow, is fed into the millbase outlet 16 and thus also into the millbase outlet space 70.
  • a second fluid flow 62 (represented by arrows), for example a second air volume flow, is fed into the millbase outlet 16 and thus also into the millbase outlet space 70.
  • the second fluid flow 62 serves on the one hand as a transport medium which mixes with the finished ground material, so that a second ground material fluid flow, in particular a second ground material air volume flow, is formed.
  • the second fluid flow 62 consequently supports the transport of the finished ground material along the ground material outlet 16 and the ground material outlet space 70. At the same time, clogging of the regrind outlet 16 with regrind is prevented.
  • an axial, second distance A2 or gap is formed between the free end or end face of the circular or tubular element 52 and the disk 46, which is preferably less than 0.3 times the diameter of the grinding media.
  • This gap is preferably flushed through channels and / or bores (not shown here) in the tubular element 52 through the second fluid flow and / or optionally through a third fluid flow (not shown here), such as a third air volume flow, so that no or hardly finished product is in can penetrate the gap.
  • the second fluid flow 62 and / or third fluid flow also functions as a flushing fluid, in particular as a flushing air, by means of which the sieve unit 42 can be cleaned.
  • a flushing fluid in particular as a flushing air
  • the openings of the sieve unit 42 which are not shown here, can also be cleaned and blown out.
  • the second fluid flow 62 is generated by an external fluid source, not shown here, in particular by an air source.
  • the external fluid source can be the same fluid source that is used to generate the first fluid flow 56.
  • the third fluid flow can be provided, for example, via a fluid source, not shown here, such as an air source.
  • the third fluid source can be a separate or external additional fluid source, in particular an air source.
  • this fluid source can be the same fluid source that is used to generate the first and / or second fluid flow 56, 62.
  • the second fluid inlet opening 60 comprises at least one further control element, not shown here, so that the second fluid flow 62 can be metered or regulated.
  • a cross section of the second fluid inlet opening 60 can be changed by means of the control element.
  • the supplied second fluid flow 62 is selected such that the negative pressure prevailing in the grinding container 12 is not impaired, but is sufficient to transport the finished ground material.

Landscapes

  • Engineering & Computer Science (AREA)
  • Food Science & Technology (AREA)
  • Crushing And Grinding (AREA)
  • Combined Means For Separation Of Solids (AREA)
  • Disintegrating Or Milling (AREA)
  • Mixers Of The Rotary Stirring Type (AREA)
EP19193548.5A 2018-09-20 2019-08-26 Broyeur à boulets à agitateur et procédé de fonctionnement d'un broyeur à boulets à agitateur Pending EP3626350A3 (fr)

Applications Claiming Priority (1)

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DE102018123096.6A DE102018123096B4 (de) 2018-09-20 2018-09-20 Rührwerkskugelmühle und Verfahren zum Betreiben einer Rührwerkskugelmühle

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EP3626350A2 true EP3626350A2 (fr) 2020-03-25
EP3626350A3 EP3626350A3 (fr) 2020-08-26

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US (1) US11235336B2 (fr)
EP (1) EP3626350A3 (fr)
JP (1) JP6885993B2 (fr)
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CN114671464A (zh) * 2022-03-28 2022-06-28 江苏龙净科杰环保技术有限公司 一种新型废催化剂清洗球磨工艺
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CN116510840A (zh) * 2023-05-12 2023-08-01 惠州市锦荣科技有限公司 一种磁铁生产加工用球磨机

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CN111389525A (zh) * 2020-04-25 2020-07-10 东莞市华汇精密机械有限公司 一种梯形叠片式纳米砂磨机
CN112495749B (zh) * 2020-12-21 2022-06-07 山东永福建设集团有限公司 一种自动化筛选搅拌一体装置
CN113244832B (zh) * 2021-05-21 2023-02-21 萍乡市方兴石化填料有限公司 一种化工填料粉碎搅拌装置
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CN113953026B (zh) * 2021-10-18 2023-03-21 天津水泥工业设计研究院有限公司 一种三轴干法搅拌磨机
CN113953029B (zh) * 2021-10-18 2023-01-31 天津水泥工业设计研究院有限公司 一种干法搅拌磨机及其运行方法
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CN114671464A (zh) * 2022-03-28 2022-06-28 江苏龙净科杰环保技术有限公司 一种新型废催化剂清洗球磨工艺
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CN110918203A (zh) 2020-03-27
EP3626350A3 (fr) 2020-08-26
DE102018123096B4 (de) 2022-01-27
DE102018123096A1 (de) 2020-03-26
US20200094259A1 (en) 2020-03-26
US11235336B2 (en) 2022-02-01
CN110918203B (zh) 2022-05-03
BR102019017377A2 (pt) 2020-03-31
JP2020075235A (ja) 2020-05-21
JP6885993B2 (ja) 2021-06-16

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