EP2723498A2 - Cylindre broyeur doté de corps durs insérés dans la surface - Google Patents

Cylindre broyeur doté de corps durs insérés dans la surface

Info

Publication number
EP2723498A2
EP2723498A2 EP12728402.4A EP12728402A EP2723498A2 EP 2723498 A2 EP2723498 A2 EP 2723498A2 EP 12728402 A EP12728402 A EP 12728402A EP 2723498 A2 EP2723498 A2 EP 2723498A2
Authority
EP
European Patent Office
Prior art keywords
grinding roller
sleeve
hard body
hard
grinding
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP12728402.4A
Other languages
German (de)
English (en)
Other versions
EP2723498B1 (fr
Inventor
Meinhard Frangenberg
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.)
KHD Humboldt Wedag GmbH
Original Assignee
KHD Humboldt Wedag 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 KHD Humboldt Wedag GmbH filed Critical KHD Humboldt Wedag GmbH
Publication of EP2723498A2 publication Critical patent/EP2723498A2/fr
Application granted granted Critical
Publication of EP2723498B1 publication Critical patent/EP2723498B1/fr
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

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
    • B02C4/00—Crushing or disintegrating by roller mills
    • B02C4/28—Details
    • B02C4/30—Shape or construction of rollers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
    • B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
    • B02C4/00—Crushing or disintegrating by roller mills
    • B02C4/28—Details
    • B02C4/30—Shape or construction of rollers
    • B02C4/305—Wear resistant rollers
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00—Metal working
    • Y10T29/49—Method of mechanical manufacture
    • Y10T29/49815—Disassembling
    • Y10T29/49821—Disassembling by altering or destroying work part or connector
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00—Metal working
    • Y10T29/49—Method of mechanical manufacture
    • Y10T29/49815—Disassembling
    • Y10T29/49822—Disassembling by applying force

Definitions

  • the invention relates to a grinding roller with hard bodies inserted into the surface for fixing a Gutbettts and methods for removing the hard body.
  • CONFIRMATION COPY Grinding roller depending on the nature of the material to be ground a limited life.
  • Some applications of this grinding technique such as the crushing of cement clinker with a high-pressure roller press allow use of the grinding rollers of several 1,000 hours until they are worn so far that the desired grinding performance is no longer achievable.
  • An application of this milling technique for crushing other materials, such as ores even allow a life of the grinding rollers of up to 10,000 hours to repair the surface or even an exchange of the grinding roller is necessary.
  • a so-called bathtub effect has formed in which the grinding roller in the axial center shows more wear than at the edges of the grinding roller and thus the grinding roller a slightly waisted shape.
  • the grinding roller undergoes a flexing movement due to the very high pressure, which is externally similar to that of a rolling car tire.
  • the flexing movement is the reason why the surface of the grinding roller is subject to very high mechanical stress.
  • a forged surface leads to a particularly long life of the grinding roller.
  • the grinding roller If the grinding roller to be worked up to restore the original cylindrical shape, it is necessary to remove at least a portion of the hard body from the surface of the grinding roller. As with decreasing hard bodies, the liability of autogenous wear protection layer is better to a limit point, it is anxious to bring as many hard bodies in the surface of the grinding rollers. A number of 22,000 hard bodies in a grinding roller is not uncommon.
  • a grinding roller If a grinding roller is worn, it can be refurbished by removing the remaining hard body, turning the grinding roller to a cylindrical shape and new sinking hard bodies. Although this changes the feeding angle according to Schönert et al., Because the diameter of the grinding roller is reduced after this type of workup and thus the parameters of the gap passage are changed. However, the high cost of the grinding roller due to the high manufacturing costs justify this type of workup, if it is possible to make the removal of the hard body economically.
  • the object of the invention is therefore to provide a grinding roller with introduced into the surface Hartkörpem available whose hard body can be removed with less effort than is necessary in the prior art.
  • the object of the invention is achieved in that the hard bodies are each received in a sleeve and inserted into the surface. Further advantageous embodiments are specified in the dependent claims 2 to 7. Methods for removing these hard bodies are given in the method claims 8 to 10.
  • a sleeve enables a simplified release of the hard body from the surface of the grinding roller, which is plastically deformed due to their material properties ductile and by Walk movements in use and thereby firmly encloses the respective hard body.
  • the sleeve is made of a material that is identical to the material of the surface of the grinding roller, a welding point can be attached to the sleeve and the sleeve can be pulled together with the hard body. In this case, the Although mechanical effort to pull the grinding roller is not much easier, but the material properties of the sleeve, which is identical to the material of the surface facilitates the welding of the welding point significantly.
  • the sleeve and / or the hard body is conically shaped within the bore.
  • the diameter at the edge of the hole at the level of the surface is greater than at the bottom or below the surface.
  • the conical arrangement allows easier pulling the sleeve together with the hard body. As the cone widens toward the surface, it is believed that the cone is forced out of the surface of the grinding roller by the flexing action of the grinding roller and the plastic deformation of the surface. However, pushing out of the cone against the nip pressure has not been observed in experiments.
  • a simple conical sleeve is internally cylindrically shaped and conically shaped at the outer edge, wherein the bore in the surface of the grinding roller is formed to correspond.
  • the hard body is conically shaped and tapers towards the head.
  • the seat of the hard body so the hole in the surface of the grinding roller, however, is cylindrical in shape.
  • the sleeve accommodates the conical hard body in the interior and has to the Hartismefuß toward a smaller wall thickness.
  • a double conical configuration is provided in which a conical hard body is received by a sleeve which fits the hard body in a conical bore, wherein the hard body is tapered towards the head and the bore is tapered towards the Hartismefuß out.
  • the sleeve is placed as a clamping ring around the hard body and thus open.
  • the clamping ring can be thick-walled or thin-walled.
  • the thick-walled sleeve is formed around the hard body, however, the thin-walled sleeve when this example. Is made of spring steel, stretched around the sleeve.
  • the sleeve consists of two individual sleeves with different material or a composite material having different materials in the axial direction.
  • a less wear-resistant, but easier to remove material is introduced in the annular space between Hartismefuß and lower bore and the annular space facing the surface of the grinding roller is equipped with a particularly wear-resistant or identical to the material of the surface material.
  • the layer thickness of the upper material is dimensioned such that it corresponds to the maximum depth of wear of the grinding roller. When the maximum wear is achieved, the easily removable sleeve becomes free. This can then be removed for workup.
  • the material of an easily removable sleeve can have a particularly low melting point or also exhibit a particularly negative, chemical standard potential, so that it can be oxidized comparatively easily.
  • the low melting point material can be removed by heating the surface and the negative standard chemical potential material can be removed by electrochemical etching. Similar to a sacrificial anode on a ship, this material is preferably electrochemically dissolved or electrolyzed before the material of the surface of the grinding roll is electrolyzed when the grinding roll is wholly or partially dipped in an electrolytic solution and anodized.
  • the latter method is particularly well suited to carry out at sites of use of the grinding roller, which are located in remote locations, such as desert areas or infrastructural poorly equipped mine species.
  • the electrochemical oxidation of the sleeve of more negative standard potential than the surface of the grinding roller may take time. During this time, however, no special equipment or manual effort is required, so that the removal of the hard body can be left almost to itself. Since the hard bodies are usually made of tungsten carbide, which is chemically resistant, the hard body residue can be recovered to supply it to the chemical treatment for the recovery of tungsten.
  • FIG. 2 shows a conical hard body in a conical sleeve in a cylindrical bore
  • FIG. 3 shows a cylindrical hard body in a conical sleeve
  • FIG. 4 shows a conical hard body in a conical bore with a double conical sleeve
  • FIG. 5 shows a waist body with a waisted body, which is clasped by an open sleeve
  • FIG. 6 shows a hard body with two sleeves of different material
  • FIG. 7 Figure of a section of a grinding roller surface, which is electrolytically freed from sleeves.
  • Figures 1 to 4 and 6 are each shown in an upper and in a lower part of the figure, wherein each upper part of the figure represents the state before depression and the respective lower part of the figure, the depressed state of the hard body and the sleeve in the surface of a grinding roller.
  • FIG. 1 shows a cylindrical hard body 100 with a spherical base 101, which is embedded in the surface 102 of a grinding roller. Between the cylindrical hard body 100 and the bore wall 104, a sleeve 105 is arranged, which allows the removal of the hard body 100 after use.
  • both the outer diameter of the hard body 100 and the inner diameter of the bore wall 104 are cylindrical, so that the sleeve 105 can be characterized as cylindrical / cylindrical in terms of sleeve shape and bore shape.
  • the material of the sleeve 105 is best made of the same material as the material of the surface 102 of the grinding roller.
  • the sleeve 105 from a material with a low melting point, which should preferably be below 400 ° C.
  • the 400 ° C limit is due to the tendency of the surface material, if it consists of ADI (Austempered Ductile Iron) to undergo a phase transformation, which also go through hardened forging materials at about this temperature.
  • ADI Austempered Ductile Iron
  • the sleeve material melts below this temperature, removal is possible by uniformly heating the surface by means of, for example, a flame, in which the material is melted and discharged, and then the hard body is pulled. Materials that melt at these low temperatures are usually very sensitive to wear.
  • the sleeve material can be liquefied by heating, so that the hard body 100 sits as soldered in the surface 102 of the grinding roller. This results in a gap-free fit of the hard body 100 in the surface 102, which is free from penetrating into the gap Mahlgutkörnchen that wedge the hard body 100 in the hole downright.
  • the sleeve 105 is made of a material having a more negative chemical standard potential than the material of the surface 102 of the grinding roller.
  • the grinding roller needs to be placed in a only about 10 to 20 cm deep pan, so that the lowest lying hard body 100 are immersed in the electrolyte solution.
  • the entire grinding roller is connected to the anode of a powerful electrical voltage source and a counter-pole is a used almost any, preferably a placed or graphitized electrode.
  • the electrical voltage is adjusted so that fine bubbles 10 of hydrogen are formed on the sleeves 100, as shown in FIG. 9, and indicate the beginning of the electrolysis.
  • the electrical voltage must not be so high that the surface 102, as indicated by the formation of bubbles, begins to decompose. Since the sleeve material has a more negative standard potential than the material of the surface of the grinding roller, it is first decomposed as a sacrificial anode first.
  • the electrolytic decomposition process may well require several days to weeks because of the surface of the sleeve 105, which is always deeper in the annulus between the hard body 100 and the bore during electrolysis and exposed to the electrolyte solution. In this time, however, only a very small monitoring effort is necessary; if necessary, the grinding roller must be rotated in a shallow bath. This type of solution of the hard body 100 from the surface can thus be left to itself and is therefore very inexpensive to perform. Above all, it is possible to perform this type of treatment even in remote places where mines are located, with little expertise and expert training.
  • FIGS. 2 to 4 show various embodiments of the hard body / sleeve pair, which can be characterized by conical / cylindrical, reference as above, in FIG. 2, cylindrical / conical in FIG. 3 and conical / conical in FIG. 4.
  • the conical / cylindrical shape according to FIG. 2 holds the hard body 200 firmly in place, but the sleeve 205 has a larger surface exposed to the grinding stock. Therefore, this sleeve shape is suitable for sleeve material made of the material of the surface of the grinding roller itself. To remove the hard body, the method is best applied here by means of the welding point which is placed on the sleeve 205.
  • the cylindrical / conical shape according to Figure 3 is also suitable for material from the surface material of the grinding roller, this mold is suitable to continue to use existing hard body 300, which are regularly cylindrically shaped in the prior art.
  • the conical / conical shape according to FIG. 4 is finally suitable for grinding rolls which are subjected to particularly high stress and in which the sleeves 400 are fixed particularly intensively by plastic deformation of the surface material.
  • FIG. 5 shows a combination of hard body 500 and sleeve 505, the sleeve 505 being shaped as an open ring around the hard body 500 and in which the hard body 500 is fitted.
  • the sleeve 505 may be placed around the hard body 505 by hot deformation prior to insertion into the bore 504.
  • this may, if it is made of spring steel, be tightened around the sleeve 500.
  • This embodiment has the advantage that the hard body 500 can be prefabricated as a hard body / sleeve combination in large quantities, whereby the assembly is simplified accordingly.
  • FIG. 6 A specific embodiment is shown in FIG. 6, wherein here a cylindrical / cylindrical configuration is selected, which stands here representative of the embodiments described in the figures described above. Particularly in this embodiment is that either two sleeves 605a and 605b in the bore 604 are superimposed and hold the hard body 600.
  • the material of the lower, sunk in the annulus between hard body 600 and bore 604 sleeve 605b made of low-melting material or material with a negative standard chemical potential.
  • the upper sleeve 605a is made of the same material as the material of the grinding roller surface.
  • the upper sleeve 605a wears approximately as fast as the remainder of the surface, so that at maximum tolerable wear, the lower sleeve 605b is exposed and can be removed by the aforementioned methods.

Landscapes

  • Engineering & Computer Science (AREA)
  • Food Science & Technology (AREA)
  • Crushing And Grinding (AREA)
  • Polishing Bodies And Polishing Tools (AREA)

Abstract

L'invention concerne un cylindre broyeur doté de corps durs (100) insérés dans la surface (102) et servant à fixer un lit de matière. Selon l'invention, il est proposé que les corps durs (100) soient reçus respectivement dans un manchon (105) et insérés dans la surface (102), ce qui permet de pouvoir enlever plus aisément les manchons de la surface, après utilisation et usure du cylindre broyeur, pour permettre un traitement de ladite surface.
EP12728402.4A 2011-06-21 2012-06-19 Cylindre broyeur doté de corps durs insérés dans la surface Active EP2723498B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102011104854.9A DE102011104854B4 (de) 2011-06-21 2011-06-21 Mahlwalze mit in die Oberfläche eingesetzten Hartkörpern
PCT/EP2012/002576 WO2012175189A2 (fr) 2011-06-21 2012-06-19 Cylindre broyeur doté de corps durs insérés dans la surface

Publications (2)

Publication Number Publication Date
EP2723498A2 true EP2723498A2 (fr) 2014-04-30
EP2723498B1 EP2723498B1 (fr) 2016-10-12

Family

ID=46320879

Family Applications (1)

Application Number Title Priority Date Filing Date
EP12728402.4A Active EP2723498B1 (fr) 2011-06-21 2012-06-19 Cylindre broyeur doté de corps durs insérés dans la surface

Country Status (8)

Country Link
US (1) US20140183291A1 (fr)
EP (1) EP2723498B1 (fr)
CN (2) CN103619481B (fr)
AU (2) AU2012272186A1 (fr)
DE (1) DE102011104854B4 (fr)
DK (1) DK2723498T3 (fr)
RU (1) RU2604508C2 (fr)
WO (1) WO2012175189A2 (fr)

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DE102012102199A1 (de) * 2012-03-15 2013-09-19 Maschinenfabrik Köppern GmbH & Co KG Presswalze
DE102013104098A1 (de) * 2013-04-23 2014-10-23 Thyssenkrupp Industrial Solutions Ag Vorrichtung zur Zerkleinerung von abrasiven Materialien
EP2991769B1 (fr) * 2013-05-01 2020-06-17 US Synthetic Corporation Ensembles rouleaux comprenant des garnitures super-dures, appareils à rouleaux de broyage à pression élevée utilisant ceux-ci et procédés d'utilisation
DE102013114516B4 (de) * 2013-12-19 2023-11-02 Flsmidth A/S Mahlwalze sowie Vorrichtung zur Bearbeitung einer Mahlwalze
CN104499025B (zh) * 2014-12-03 2017-11-03 哈尔滨工业大学 一种平模生物质成型机用压辊的陶瓷层生长方法
DE102015207922A1 (de) 2015-04-29 2016-11-03 Takraf Gmbh Hartkörper als Rasterpanzerung für eine Rollenpresse, Verfahren zur dessen Herstellung, und Rolle für eine Rollenpresse
DE102016200912A1 (de) * 2016-01-22 2017-07-27 Thyssenkrupp Ag Verschleißschutzelement für eine Zerkleinerungseinrichtung
WO2021105237A1 (fr) * 2019-11-26 2021-06-03 Thyssenkrupp Industrial Solutions Ag Élément résistant à l'usure pour un appareil de broyage

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Also Published As

Publication number Publication date
WO2012175189A3 (fr) 2013-05-23
DE102011104854A1 (de) 2012-12-27
DK2723498T3 (en) 2017-01-30
AU2017225143A1 (en) 2017-10-05
DE102011104854B4 (de) 2015-06-11
AU2012272186A1 (en) 2014-01-09
CN103619481B (zh) 2016-01-13
WO2012175189A2 (fr) 2012-12-27
CN105032544A (zh) 2015-11-11
EP2723498B1 (fr) 2016-10-12
CN103619481A (zh) 2014-03-05
US20140183291A1 (en) 2014-07-03
RU2604508C2 (ru) 2016-12-10
AU2017225143B2 (en) 2019-07-18
RU2013155992A (ru) 2015-07-27

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