EP3815789B1 - Rührwerkskugelmühle - Google Patents

Rührwerkskugelmühle Download PDF

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Publication number
EP3815789B1
EP3815789B1 EP20202007.9A EP20202007A EP3815789B1 EP 3815789 B1 EP3815789 B1 EP 3815789B1 EP 20202007 A EP20202007 A EP 20202007A EP 3815789 B1 EP3815789 B1 EP 3815789B1
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EP
European Patent Office
Prior art keywords
agitator
shaft
protection sleeve
flanges
bodies
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.)
Active
Application number
EP20202007.9A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP3815789A1 (de
Inventor
Udo Enderle
Thomas GOLLER
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
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Publication of EP3815789A1 publication Critical patent/EP3815789A1/de
Application granted granted Critical
Publication of EP3815789B1 publication Critical patent/EP3815789B1/de
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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
    • B02C17/163—Stirring means

Definitions

  • the invention relates to an agitator mill with a grinding chamber containing grinding bodies, with an agitator shaft, a shaft protective sleeve and several agitator bodies according to the preamble of claim 1 or a system for equipping such an agitator mill according to the preamble of claim 11.
  • the invention also relates to a method for equipment such an agitator mill with such a system according to the preamble of claim 13.
  • an agitator mill 1 with a horizontal agitator shaft 3 is shown schematically.
  • the grinding bodies preferably fill at least 70%, preferably at least 90%, of the volume of the grinding chamber 7 that is available without internals.
  • the material to be ground is pumped via the inlet 5 of the agitator mill 1 into or through the grinding chamber 7 enclosed by the grinding container 2 .
  • the material to be ground is solid particles dispersed or suspended in a liquid, in particular water.
  • the suspension or dispersion is pumped continuously through the milling chamber. However, it can also be fed to the agitator mill in batches.
  • such an agitator mill can also be used for dry grinding. It can then be designed as an agitator mill with a vertical shaft, through which the material to be ground is carried, for example by a gaseous fluid, usually in a downflow.
  • the present invention in its broadest aspect, relates to both types of attrition mills. However, their use is very particularly preferred in agitator mills with a horizontal agitator shaft.
  • a rotational movement of the agitator shaft 3 causes the agitator bodies 8, which are connected in a rotationally fixed manner to the agitator shaft 3 and are frequently also referred to as grinding disks, to rotate.
  • the agitator shaft 3 can be driven by an electric motor 9 via a belt drive 10, for example.
  • the drive of the agitator mill 1 is usually located in a housing 11 adjacent to the grinding container 2.
  • the movement of the stirring bodies 8 sets the grinding bodies in motion.
  • the movement of the respective grinding media which in most cases causes the grinding media to revolve completely around the agitator shaft, is usually a chaotic movement.
  • a grinding body carried along by the stirring bodies in the circumferential direction often has an individual translational movement component, which is superimposed by an intrinsic rotation about the center of the respective grinding body.
  • the individual translational movement component often also has an at least temporary component in the direction along the longitudinal axis of the agitator shaft, for example when the agitating bodies are provided with windows through which the grinding media can move from one chamber to the next. Due to these movements of the grinding media, the solid particles contained in the ground material are separated by the impact and shearing forces crushed or dispersed in the grinding media.
  • the material to be ground and the grinding media are separated by means of a suitable separation system.
  • suspended particles can be comminuted down to the range with average fineness (grain sizes) of ⁇ 50 nm.
  • a separating system 4 for example in the form of a sieve or a filter, is fitted in front of the outlet 6.
  • an agitator mill which has an agitator shaft on which a plurality of disk-shaped agitators arranged at an axial distance from one another are mounted.
  • Each individual agitator consists of several disc segments, each of which has an axial opening and which are screwed to the agitator shaft or to a hub mounted on the agitator shaft by means of screw connections.
  • the threaded holes in the shaft or the hubs run in the radial direction.
  • the screws for fastening the disc segments are pushed through radial countersunk holes in the disc segments and screwed to the threads in the hubs or the shaft.
  • the through countersunk bores run from the axial opening of the disk segments to the surface of the respective disk segment that rests on the shaft or the hub in the assembled state.
  • this problem is solved with the features of the main claim directed to the agitator mill. Accordingly, the problem is solved with an agitator mill with a grinding chamber containing grinding bodies and an agitator shaft rotating therein during operation.
  • the agitator shaft carries a rotating shaft protection sleeve and several discs in the broader sense non-rotatably connected to the shaft protection sleeve. These form the so-called agitating bodies, which are referred to below as disk-like agitating bodies.
  • the stirring elements set the grinding elements in motion.
  • the agitator mill according to the invention is characterized in that the shaft protection sleeve is divided into several sleeve sections. The sleeve sections each carry a flange at their front end.
  • the disk-like stirring bodies have a mostly annular disk-shaped coupling section with two opposing annular coupling surfaces.
  • This The coupling section is in the center of the mixing body. It directly borders the free central area of the agitator body through which the agitator shaft passes.
  • the coupling portion is held between the flanges of a preceding and a succeeding sleeve portion, typically sandwiched, as viewed in a direction along the axis of the agitator shaft. As a rule, it is held in such a way that one of the annular coupling surfaces rests against a flange that is axially opposite it, mostly over the entire surface.
  • a non-rotatable connection is produced between the flanges and the disk-like stirring body, in that the stirring body, more precisely its coupling section, and the flanges are penetrated by pins.
  • the pins are positioned with their pin longitudinal axis essentially parallel to the axis of rotation of the agitator shaft.
  • a first sleeve section of the shaft protection sleeve is first pushed onto the agitator shaft.
  • a first stirring body is then pushed onto the stirring shaft until one of its two annular coupling surfaces rests against the flange of the first sleeve section.
  • a form fit is produced in the radial direction between each pin and each bore of the stirring body provided for this purpose.
  • the pins are ideally fastened to the flange of the first sleeve section, usually inseparably by welding. A rotationally fixed connection is thus produced between the stirring body and the flange of the first sleeve section.
  • the next sleeve section is then pushed onto the agitator shaft until its flange rests against the second coupling ring surface of the agitator body.
  • the second flange with its bores provided for this purpose is also placed on the pins fastened to the flange of the first sleeve section postponed.
  • the second sleeve section is thus connected to the stirring body in a rotationally fixed manner.
  • This process can finally be repeated until the desired number of sleeve sections and stirring bodies have been pushed onto the stirring shaft.
  • the pins for producing a rotationally fixed connection do not necessarily have to be attached to the flange of the respective first sleeve sections of the shaft protection sleeve. It is also conceivable to attach the pins to the flange of the second sleeve section, while the first flange is equipped with the bores complementary to the pins. A further possibility is to attach or fix the pins to the stirring bodies as pins protruding on both sides and to equip the flanges of the sleeve sections adjacent to the stirring body with associated bores, which better takes account of the idea of identical parts. Another option, which is usually too cumbersome for assembly, is to drill holes in both flanges and the agitator body in between and only guide the pins through the holes after the shaft sleeves and agitator bodies have been assembled.
  • the sleeve sections lying between the first and the last sleeve section ideally each have a flange at both axial ends.
  • the pins are ideally attached to a flange to create a rotationally fixed connection with a stirring body and a subsequent sleeve section, while it is ideal to equip the other flange with bores into which the pins of the previous sleeve section pushed through the stirring body can be inserted.
  • the flanges are ideally attached to the sleeves by welding.
  • pins have decisive advantages. With their help, the flanges can be perfectly positioned relative to one another and, together with their sleeve sections, can be positively connected to form a quasi "monolithic" block. Pinning is better and easier than using thru-bolts. This also applies to large agitator mills in particular, where noticeable tolerances can occur between the feather key, which is then very large, and the feather key groove in the respective flange.
  • the pin solution according to the invention has the advantage that it is absolutely flush. In addition, where no nuts are to be used, it eliminates the time-consuming production of a large number of threaded holes in the flanges and/or the stirring bodies.
  • the individual components of the shaft protection sleeve and the individual agitator bodies can be mounted easily and quickly on the agitator shaft. To do this, they simply have to be pushed onto the agitator shaft one after the other. The assembly takes place essentially without tools.
  • a further advantage of an agitator mill designed according to the invention is that the radial ends of the flanges move closer to the center of the shaft.
  • the flanges which previously had to be designed to be more voluminous than the pure stirring bodies, are therefore smaller. This increases the size of the part of the grinding chamber that is free of internals. Ultimately, this leads to an increase in the usable grinding chamber.
  • stirring bodies are not connected to the flanges by means of a radial screw connection, this can also result in the further advantage that the necessary radial and axial wall thickness of the stirring bodies may also be reduced. This also leads to an increase in the internals-free volume that the grinding chamber has, which improves productivity.
  • the term "tool-free" describes that the individual components are designed in such a way that, in principle, no hand tools are required for assembly. However, it is not ruled out that a hammer is used to facilitate joining, for example, the pins into the boreholes. The use of a crane for correspondingly large or heavy components is also not ruled out. In addition, it is conceivable that tools are required before and after the assembly of the shaft protective sleeve and agitator body on the agitator shaft in order to prepare the agitator shaft for assembly, for example to secure the position of the first and to mount axial stops on the agitator shaft in the last sleeve section.
  • grinding bodies denotes the bodies located in the grinding chamber of the agitator mill, which cause the material to be ground that is fed to the agitator mill during operation to be comminuted. As a rule, these are steel, glass or ceramic balls.
  • disk-like stirring elements describes that the geometry of the stirring elements is or essentially a cylinder, the diameter of which exceeds the maximum thickness in the direction of its longitudinal axis by a factor of at least 1.5, preferably at least a factor of 3.
  • the thickness of the stirring body does not have to be uniform over the entire diameter.
  • the agitator bodies in addition to the opening with which they are pushed onto the agitator shaft or the shaft protective sleeve, can have further window-like openings running in the axial direction.
  • the pins in the direction of their pin longitudinal axis only on one of the two flanges. Preferably this is done by welding the pins to the corresponding flange.
  • the pin openings on the other of the two flanges are designed in such a way that by pushing the pins into these pin receiving openings, a fit results that can be joined by hand. This is preferably a transition fit according to ISO 286.
  • the stirring bodies must therefore only be slid onto the stirring shaft or onto a sleeve section of the shaft protection sleeve until their annular coupling surface rests against the flange of the sleeve section. As soon as the following sleeve section was pushed on and rested with its flange on the stirring body, a non-rotatable connection was established between the stirring body and the sleeve sections.
  • the stirring body is also secured axially. Since the pins have already been fixed to the flange of the first sleeve section and the fit between the pins and the holes provided for them in the flange of the second sleeve section is a transition fit, tool-free assembly of the agitator body and sleeve sections on the agitator shaft is ensured.
  • each stirring body is centered on at least one of the flanges holding it by means of an annular shoulder formed on it.
  • the centering is preferably carried out by a form-fitting interaction between the outer lateral surface of a flange of a sleeve section and said annular shoulder.
  • the agitator shaft 3 has at least one, better at least two driver strips.
  • the entrainment strips are preferably each designed as or in the manner of a feather key, of which the following is representative.
  • the sleeve sections are carried along in the direction of rotation by the form-fitting interaction of the feather keys with the corresponding driving grooves of their two flanges.
  • a rotational movement of the shaft is transmitted to the shaft protection sleeve due to the form fit between the at least one feather key and the sleeve sections of the shaft protection sleeve.
  • the at least one feather key can be in one piece or composed of several pieces. If it is composed of several pieces, an axial distance between the individual sections is also conceivable.
  • the feather keys are preferably always attached to the agitator shaft in such a way that the sleeve sections can be pushed into their end position in one go along the agitator shaft without realignment. Consequently, in the case of a multi-part design, the individual sections of the feather key must be aligned.
  • the at least one feather key is ideally installed in the agitator shaft without play.
  • the strip is preferably mounted on the agitator shaft by being pressed or screwed to the agitator shaft.
  • each stirring body is a circumferentially closed, ring-shaped disk and not just a pie-shaped disk sector, which tends to favor the (problem-free) transmission of higher torques to the respective stirring body.
  • This is ideally a one-piece cast disc.
  • each stirring body can be slid onto a flange as a whole, with the flange receiving the stirring body first preferably already being fitted with the required pins.
  • the agitator body has a firm hold simply by pushing the components together, without the need for a screw connection in the flange area.
  • the manufacture of the stirring bodies by a casting process is particularly useful when window-like openings are to be provided in the stirring bodies and large components are involved, since no waste is produced in the casting process. Consequently, material can be saved.
  • each stirring body has a coupling shoulder adjoining its inner radius, which is pierced on both sides from the end faces.
  • the coupling shoulder is therefore a section of the stirring body which, measured in the direction along the axis of rotation of the stirring shaft, is thinner than the non-pierced section of the stirring body.
  • the surfaces of the coupling shoulders facing the flanges of the sleeve sections in the assembled state of the stirring body are the aforementioned annular coupling surfaces of the stirring body in question.
  • each stirring body is received completely between the flanges of two immediately adjacent sleeve sections.
  • the axial positioning of the sleeve sections and their flanges is thereby ensures that the first sleeve section of the shaft protective sleeve that is pushed onto the agitator shaft rests in a form-fitting manner against a first axial stop.
  • the last sleeve section pushed onto the agitator shaft is in positive contact with a second axial stop.
  • the second axial stop acts in the opposite axial direction to the first axial stop.
  • Each further sleeve section located between the first and the last sleeve section is preferably not fixed directly to the agitator shaft in the axial direction. Rather, for the sake of simplicity, the axial fixing of the intermediate sleeve sections takes place ideally indirectly, with the aid of sleeve sections adjacent on both sides.
  • the first sleeve section of the shaft protection sleeve is thus pushed over the agitator shaft until it rests against a first axial stop.
  • the other sleeve sections and the stirring bodies are then pushed onto the stirring shaft one after the other.
  • another axial stop is finally attached to the agitator shaft. In the mounted state, this prevents the sleeve section that was last pushed onto the agitator shaft from slipping in the direction from which it was pushed onto the agitator shaft. Since the individual sleeve sections and stirring bodies are all axially adjacent to one another, all sleeve sections and stirring bodies are prevented from slipping axially along the stirring shaft.
  • one of the axial stops or both axial stops is not designed as a shaft shoulder, a tool may have to be used to mount the axial stop.
  • the sleeve sections, their flanges and preferably also the exposed surfaces of the stirring bodies are provided with a coating.
  • the coating has a friction-increasing effect. In most cases, it also has a dampening effect on the impact of the falling grinding media.
  • this is a coating of rubber or an elastomer, ideally a soft elastomer.
  • the coated surfaces of the shaft protection sleeve are preferably those that come into contact with the grinding bodies during operation of the agitator mill. Since the friction of the coated surfaces is ideally increased by the coating, the grinding media in contact with the corresponding surfaces are set in motion more effectively. The grinding process is thus optimized.
  • free surfaces preferably describes those surfaces which are directly accessible to the grinding bodies on the grinding chamber side.
  • Such an agitator mill has a grinding chamber and an agitator shaft which rotates therein during operation and is to be protected from the direct action of the grinding bodies.
  • the system according to the invention for equipping the agitator mill consists of a multi-part shaft protection sleeve with several sleeve sections, each of which has a flange at its front end, as well as pins and stirring bodies.
  • each stirring body has a coupling ring surface that can be installed between the flanges of a preceding and a following sleeve section.
  • the non-rotatable connection between the flanges and the disk-like stirring body is made in such a way that the stirring body and the flanges are penetrated by pins.
  • the pins are positioned with their pin longitudinal axis completely or at least essentially parallel to the axis of rotation of the agitator shaft.
  • the surfaces of the system for equipping an agitator mill which come into contact with the grinding media in the assembled state are provided with a coating.
  • the coating ideally has a friction-increasing or dampening effect. It corresponds to what is described above.
  • the above problem is solved with a method for equipping an agitator mill with a grinding space containing grinding media and a rotating agitator shaft with agitators that are rotated by the agitator shaft.
  • the method is characterized in that the assembly takes place by initially pushing a first sleeve section of the shaft protective sleeve onto the agitator shaft until it is in positive contact with an axial stop.
  • the first sleeve section is pushed onto the agitator shaft in such a way that, in the assembled state, it is connected to the agitator shaft in a rotationally fixed manner by means of a bar acting as a feather key.
  • a first stirring body is then pushed onto a section or flange of the first sleeve section facing away from the axial stop.
  • the first stirring body is connected to the first sleeve section in a rotationally fixed manner via pins which are attached to the flange of the first sleeve section facing away from the axial stop. Any number of further sleeve sections and stirring bodies can then be mounted on the stirring shaft in the same way as the first stirring body and sleeve section.
  • Each sleeve section serves as an axial stop for the following sleeve section. An additional axial stop must only be attached to the agitator shaft on the side facing away from the first sleeve section for the sleeve section mounted last.
  • Such a sleeve section 17 is pushed onto an agitator shaft until the flange 20 rests against an agitator body 12 which is also mounted on the shaft.
  • the two driver grooves 23 of the flange 20 form a positive fit with the driver bar of the agitator shaft, so that a rotational movement of the agitator shaft is transmitted to the sleeve section 17 .
  • the superstructures are centered in relation to the central agitator shaft, as a rule, via the flanges 19, 20, which position with the inner peripheral surface of their central opening against the Circumferential lateral surface of the agitator shaft, not shown here.
  • the flange 20 of the sleeve portion 17 has a plurality of pin-receiving openings 22 . If the flange 20 rests against a stirring body 12 in the assembled state, the pins 21 of the flange of a preceding shaft sleeve section protrude into the pin receiving openings 22.
  • a flange 19 lying opposite the flange 20 in the assembled state is shown in a sectional view.
  • the flange 19 is designed here as a “pin flange”; it carries pins 21—preferably on pins 21 that are already fixed to it from the start.
  • the flange 19 also lies on the in 3 not shown stirring body 12 at.
  • the flange 19 also has two driver grooves 23 which form a form fit with the driver bar of the agitator shaft.
  • a rotationally fixed connection between the stirring body 12 and the flange 19 is produced with the aid of the pins 21 of the flange 19 .
  • a lateral surface 25 is provided on the flange 19 .
  • a sleeve section 17 is shown in longitudinal section.
  • the sleeve section 17 consists of a sleeve 29 and the two flanges 19 and 20, which - are attached to the front ends 18 of the sleeve 29 - for example by means of the welds 26.
  • the sleeve section 17 is provided with a coating or rubber coating 24 .
  • the primary function of the coating on the sleeve section 17 is to dampen impact impacts from grinding bodies that fall.
  • a secondary function of the coating can be to improve the friction between the grinding media in the grinding chamber and the sleeve section, in order thereby to improve the entrainment of the grinding media.
  • the sleeve 29 of the sleeve section 17 does not bear directly against the agitator shaft protected by it, but rather forms an annular gap opposite it.
  • the sleeve section of the shaft protective sleeve is prevented under all circumstances from passing on forces acting on it or impacts of falling grinding media directly to the agitator shaft.
  • the clearance of the sleeve section in relation to the agitator shaft is maintained even after a long period of use, so that the sleeve section can always be replaced without any problems (jamming-free) in the course of an overhaul of the mill.
  • a stirring body 12 is shown. This has several window-like openings 28 here. These openings can serve to allow the flow of material to be ground to have a better flow from one grinding chamber between two stirring bodies to the next grinding chamber. Under certain circumstances, they also increase the entrainment of the grinding media.
  • the coupling section encompassing or edging the central opening of the stirring body forms a coupling ring surface 13 facing the viewer and an annular shoulder 14 at its radially outer end.
  • the stirring body 12 rests axially against at least one of the flanges 19 or 20 in the fully assembled state.
  • centering takes place via the inner peripheral surface 14 of the coupling section 13 (cf. 6 ), which then sits on the outside lateral surface 25 of a flange 19 or 20 (cf. 4 ).
  • a plurality of pin receiving holes 15 are provided in the coupling portion.
  • the pins 21 of the "pin flange" 19 are pushed into this (if such a flange is preferably used) in order to connect the stirring body 12 in a rotationally fixed manner to the shaft sleeve.
  • the stirring body here consists of an inner metal frame 27 of a rubber coating 16 is surrounded.
  • This coating 16 also serves to increase the friction between the stirring body 12 and the grinding bodies located in the grinding chamber and, here mostly only secondarily, possibly also to dampen impact impacts.
  • the coating is ideally designed in such a way that it can be stripped and renewed when it is worn, which optionally leads to a corresponding use of the stirring body 12 .
  • stirring body 12 is shown in a sectional view.
  • the inner metal frame 27 and the coating 16 surrounding the metal frame 27 can therefore be clearly seen here.

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  • Engineering & Computer Science (AREA)
  • Food Science & Technology (AREA)
  • Mixers Of The Rotary Stirring Type (AREA)
  • Crushing And Grinding (AREA)
EP20202007.9A 2019-10-31 2020-10-15 Rührwerkskugelmühle Active EP3815789B1 (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102019129467.3A DE102019129467A1 (de) 2019-10-31 2019-10-31 Rührwerksmühle

Publications (2)

Publication Number Publication Date
EP3815789A1 EP3815789A1 (de) 2021-05-05
EP3815789B1 true EP3815789B1 (de) 2022-06-29

Family

ID=73013131

Family Applications (1)

Application Number Title Priority Date Filing Date
EP20202007.9A Active EP3815789B1 (de) 2019-10-31 2020-10-15 Rührwerkskugelmühle

Country Status (5)

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EP (1) EP3815789B1 (pt)
AU (1) AU2020257028B2 (pt)
DE (1) DE102019129467A1 (pt)
ES (1) ES2926287T3 (pt)
PT (1) PT3815789T (pt)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114893975A (zh) * 2022-03-01 2022-08-12 宁夏链杞智汇科技有限公司 一种无碱枸杞干燥机能量回收循环利用装置

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DD272805A1 (de) * 1988-06-02 1989-10-25 Freiberg Bergakademie Hochverschleissfestes ruehrwerk fuer eine ruehrwerksmuehle
DE10219482B4 (de) 2002-04-30 2004-05-27 Netzsch-Feinmahltechnik Gmbh Rührwerksmühle
TW547231U (en) * 2002-12-31 2003-08-11 Prec Machinery Res & Dev Cen Extra-fine polishing and dispersing apparatus
DE202017003318U1 (de) * 2017-06-23 2017-08-01 Hosokawa Alpine Aktiengesellschaft Rotor für Rührwerksmühlen
CN207287618U (zh) * 2017-07-31 2018-05-01 浙江华宝油墨有限公司 一种研磨筒转子

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Publication number Publication date
DE102019129467A1 (de) 2021-05-06
AU2020257028B2 (en) 2021-11-04
EP3815789A1 (de) 2021-05-05
PT3815789T (pt) 2022-09-01
ES2926287T3 (es) 2022-10-25
AU2020257028A1 (en) 2021-05-20

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