EP0187252A2 - Broyeur à impact pour le concassage de rocher ou similaire - Google Patents

Broyeur à impact pour le concassage de rocher ou similaire Download PDF

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Publication number
EP0187252A2
EP0187252A2 EP19850115164 EP85115164A EP0187252A2 EP 0187252 A2 EP0187252 A2 EP 0187252A2 EP 19850115164 EP19850115164 EP 19850115164 EP 85115164 A EP85115164 A EP 85115164A EP 0187252 A2 EP0187252 A2 EP 0187252A2
Authority
EP
European Patent Office
Prior art keywords
hard metal
rotor
impact mill
mill according
surface section
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.)
Withdrawn
Application number
EP19850115164
Other languages
German (de)
English (en)
Inventor
Günter Müller
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.)
Sbm Wageneder GmbH
Original Assignee
Sbm Wageneder 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
Priority claimed from AT384484A external-priority patent/AT381246B/de
Application filed by Sbm Wageneder GmbH filed Critical Sbm Wageneder GmbH
Publication of EP0187252A2 publication Critical patent/EP0187252A2/fr
Withdrawn legal-status Critical Current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
    • B02C13/00—Disintegrating by mills having rotary beater elements ; Hammer mills
    • B02C13/14—Disintegrating by mills having rotary beater elements ; Hammer mills with vertical rotor shaft, e.g. combined with sifting devices
    • B02C13/18—Disintegrating by mills having rotary beater elements ; Hammer mills with vertical rotor shaft, e.g. combined with sifting devices with beaters rigidly connected to the rotor
    • B02C13/1807—Disintegrating by mills having rotary beater elements ; Hammer mills with vertical rotor shaft, e.g. combined with sifting devices with beaters rigidly connected to the rotor the material to be crushed being thrown against an anvil or impact plate
    • B02C13/1835—Disintegrating by mills having rotary beater elements ; Hammer mills with vertical rotor shaft, e.g. combined with sifting devices with beaters rigidly connected to the rotor the material to be crushed being thrown against an anvil or impact plate by means of beater or impeller elements fixed in between an upper and lower rotor disc
    • B02C13/1842—Disintegrating by mills having rotary beater elements ; Hammer mills with vertical rotor shaft, e.g. combined with sifting devices with beaters rigidly connected to the rotor the material to be crushed being thrown against an anvil or impact plate by means of beater or impeller elements fixed in between an upper and lower rotor disc with dead bed protected beater or impeller elements

Definitions

  • the invention relates to an impact mill for crushing rock or the like.
  • an approximately ring-shaped housing With an approximately ring-shaped housing, the inward-facing impact surfaces of which are preferably formed by depositing a layer of crushed material, and with a on a vertical drive shaft to form an annular gap to the housing arranged rotor with an axial inlet opening, which has a base plate with a central baffle plate, a cover plate with a central recess and between the base and cover plate wings, the sides of which face the rotor axis are each provided with a pocket for holding shredded material, and each of which is connected to it the pocket has an exposed wear part with an ejection edge on the rotor circumference, the wear part consisting of a support body which is exchangeably fastened to the wing and has a tungsten carbide-containing hard metal reinforcement.
  • Impact mills of this type are known, for example, from US Pat. No. 3,970,257. They are primarily used to shred larger pieces of rock into chippings or sand, whereby as far as possible all baffles that come into direct contact with the shredded material are covered with a layer of shredded material, so that the corresponding construction parts are protected from excessive wear.
  • the housing of such an impact mill is designed as a cross-sectionally U-shaped, inwardly open ring in which the comminuted material can be deposited, and the pockets of the rotor blades are each formed by concavely arranged limiting parts.
  • the wear body is U-shaped and takes on a hard metal strip made of a tungsten carbide alloy exists in rock drill quality.
  • the tungsten carbide hard metals of the hard metal grades that fall under the collective term of cemented carbide have an increasing Vickers hardness and an increasing wear resistance, but in contrast the impact resistance decreases, ie the carbide becomes more brittle with an increasing share of toilets.
  • the wear bodies and hard metal strips shown in US Pat. No. 3,970,257 are continuously exposed to impact stresses of the rock pieces thrown off the rotor due to their arrangement at the outermost end of the pocket limiting part arranged along the circumference.
  • the hard metal reinforcement in rock drill quality has a satisfactory impact resistance, but its wear resistance is relatively low, resulting in a service life of 30 hours. Since the impact mills are mainly used to produce cubic chippings from hard rock, hard metal alloys with more than 91% WC content can no longer be used, which would result in a significantly longer service life.
  • the invention has now set itself the task of designing an impact mill of the type mentioned in such a way that the wear body provided with the hard metal reinforcement achieves the longest possible service life and is reinforced in at least all highly stressed areas, the risk of breakage from impact being as low as possible .
  • the hard metal reinforcement consists of a hard metal alloy with a tungsten carbide content of over 91%, the rest essentially cobalt, and forms a wear surface, the surface section of which adjoins the material-receiving pocket forms an angle of at least 180 ° with a contact plane of the edge edges of the material receiving pocket, with each subsequent surface section running back at a raised angle.
  • the angle between the first surface section and the plane of contact will preferably be 195 °.
  • At least one further surface portion of the wear surface that is recessed to the outside will preferably be provided so that it runs convexly.
  • the first surface section of the wear surface extends within an angle of at most 30 °, preferably 15 °, to a plane running through the rotor axis and the ejection edge, this angle also being dependent on the ratio of the baffle plate diameter to the rotor diameter . It has proven to be advantageous if the contact plane is a tangential plane of the baffle plate.
  • the hard metal reinforcement is preferably an L-like body, through the longer part of which the first surface section adjoining the material receiving pocket of the ver Wear surface is formed, which defines the ejection edge with the second surface section.
  • the service life of this preferred embodiment is about 1000 hours, so it could be increased to more than 30 times the known impact mill.
  • a hard metal reinforcement with 94% WC, a Vickers hardness of 1450 HV and a grain size of the tungsten carbide between 0.002 and 0.004 im was used for this.
  • the Vickers hardness is preferably between 1250 and 1500 HV.
  • the particularly long service life also resulted from the fact that the removal of the reinforcement metal begins in the area of greatest thickness and thus leads to a convex-shaped rounding until the end of the service life, which is essentially parallel to the concave contact surface of the hard metal reinforcement on the support body.
  • the residual layer when replacing the wear body is therefore essentially uniformly minimized and an almost optimal utilization of the layer thickness is achieved.
  • FIG. 1 shows a vertical section through an impact mill according to the invention
  • FIG. 2 shows a horizontal section through a rotor in a first embodiment
  • FIG. 3 enlarges in detail an end of a rotor blade equipped with the wear body
  • FIG. 4 shows a horizontal section through second embodiment of a rotor.
  • the impact mill according to the invention has the drive and the outlet opening for the comminuted material material-containing substructure on an annular housing 1, which is approximately U-shaped in cross section, with the open side facing the center. Baffles are formed in it by the material that sets in during commissioning.
  • a rotor 2 driven by the motor 3 is arranged in the housing 1 so as to be rotatable about a vertical axis 8, an annular gap 6 remaining through the rotor 2 and the housing 1, through which the shredded material falls downward to the outlet opening.
  • the rotor 2 has a base plate 9, a cover plate 10 and vanes 11 arranged between them, the cover plate 10 being provided with a central opening through which the material to be shredded, which is fed in via the filling opening 4, into the interior of the rotor 2 arrives.
  • a baffle plate 7 which distributes the material to be shredded, which accelerates in the rotor 2 with the help of the vanes 11 and is finally thrown out through outlet openings 16 onto the baffle surfaces of the housing 1 and is thereby broken.
  • s is preferably selected.
  • the rotor 2 is provided with three vanes 11, which essentially extend in the circumferential direction while leaving a central area the size of the baffle plate 7.
  • Each wing 11 consists of a three-sided part with the circumference correspondingly curved outside and inside, each inside of two wings 11 defining an ejection channel that narrows towards the outlet opening 16.
  • One of the two inside sides are concave, so that a material receiving pocket 17 is formed, in which material accumulates at the beginning of the shredding process, the surface of which forms an impact surface, whereby the wing 11 is protected from damage.
  • an exchangeable wear body is arranged, which consists of a support body 12 fastened to the wing 11 and a wear-resistant hard metal reinforcement 13, especially of the type B 10 T with a tungsten carbide content of 94%, a Vickers hardness of 1450 HV and a tungsten carbide grain size between 0.002 and 0.004 mm.
  • the carrier body 12 which is fastened to the wing end 15 by means of screws 14, has, for example, the essentially L-shaped basic shape shown, which is composed of a long leg 18, on which the screw 14 engages, and a shorter leg 19, which grips the wing end 15.
  • the hard metal reinforcement 13 is also L-shaped in cross section, and has a longer part 20 and a shorter part 21, the L shape of which is rotated by an angle B of preferably 40 ° with respect to the L shape of the support body 12, so that it covers the end 15 of the wing 11 like a roof.
  • the surface section 22 is provided on the longer part 20 of the hard metal reinforcement 13 adjoining the material receiving pocket 17 and the surface section 23 of the wear surface on the shorter part 21, while the inside contact surface is composed of the surface elements 25 and 28. Cut the surface sections 22, 23 one another at right angles in the ejection edge 24.
  • the longer part 20 of the hard metal reinforcement 13 is uniformly thick, since the surface sections 22 and 25 run parallel.
  • the shorter part 21 of the hard metal reinforcement tapers, since the two surface sections 23 and 28 converge towards the free end.
  • the contact surface of the hard metal reinforcement 13 is concave, since the two surface sections 25 and 28 enclose an angle of approximately 135 °, and the contact surface of the carrier body 12 is correspondingly convex.
  • the transition region of the two legs 18, 19 of the carrier body 12 is chamfered, the chamfer surface being essentially parallel to the first surface section 22 of the wear surface.
  • the first surface section 22 of the wear surface of the hard metal reinforcement lies at an angle ⁇ of at least 180 ° (FIG. 4), but preferably at an angle of 195 ° to the contact plane B.
  • the wear thus begins in the region of the ejection edge 24, that is to say the point at which the hard metal reinforcement 13 has the greatest wearable thickness, so that with increasing wear over the length an approximately uniform thickness of the hard metal reinforcement 13 finally arises, and the ejection surface finally follows the line 27 drawn in broken lines.
  • the hard metal reinforcement 13 is hardly at risk of breakage, and the convex bearing surface of the support body 12 also provides excellent relining.
  • the first surface section 22 extends at an angle ⁇ of approximately 15 ° to the axial plane A, while the angle ⁇ in the embodiment according to FIG. 4 is approximately 30 °.
  • the height of the hard metal reinforcement 13 can also be divided into several sections, which are preferably arranged at a small distance from one another on the support body 12.
EP19850115164 1984-12-04 1985-11-29 Broyeur à impact pour le concassage de rocher ou similaire Withdrawn EP0187252A2 (fr)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
AT384484A AT381246B (de) 1984-12-04 1984-12-04 Prallmuehle zum zerkleinern von gestein od.dgl.
AT3844/84 1984-12-04
AT2217/85 1985-07-26
AT221785 1985-07-26

Publications (1)

Publication Number Publication Date
EP0187252A2 true EP0187252A2 (fr) 1986-07-16

Family

ID=25597976

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19850115164 Withdrawn EP0187252A2 (fr) 1984-12-04 1985-11-29 Broyeur à impact pour le concassage de rocher ou similaire

Country Status (3)

Country Link
EP (1) EP0187252A2 (fr)
HU (1) HUT41654A (fr)
YU (1) YU185685A (fr)

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0265580A2 (fr) * 1986-10-30 1988-05-04 SBM WAGENEDER Gesellschaft m.b.H. Broyeur à impact pour le broyage de roches ou semblables
GB2209688A (en) * 1987-09-15 1989-05-24 Kobe Steel Ltd Impact crushing
US4877192A (en) * 1988-06-06 1989-10-31 Rossouw Pieter J Rotary impact crusher main wear tip
US4940188A (en) * 1987-12-24 1990-07-10 John Rodriguez Tip holder for mineral breaker
GB2247418A (en) * 1990-08-31 1992-03-04 Kobe Steel Ltd Vertical impact crusher with cemented carbide chips
AT394501B (de) * 1986-10-30 1992-04-27 Wageneder Sbm Gmbh Auswechselbarer verschleissteil fuer den rotor einer prallmuehle
FR2676661A1 (fr) * 1991-05-23 1992-11-27 Drac Isere Concassage Sa Broyeur a axe vertical.
WO1995011086A1 (fr) * 1993-10-22 1995-04-27 Barmac Associates Limited Dispositifs de broyage de mineraux
EP0835690A1 (fr) 1996-10-11 1998-04-15 Van der Zanden, Johannes Petrus Andreas Josephus Procédé et dispositif de broyage par la collision synchronisée de matériau
WO2004020100A1 (fr) * 2002-08-28 2004-03-11 Sandvik Intellectual Property Hb Dispositif de retenue d'une piece d'usure d'un broyeur

Cited By (17)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AT394501B (de) * 1986-10-30 1992-04-27 Wageneder Sbm Gmbh Auswechselbarer verschleissteil fuer den rotor einer prallmuehle
EP0265580A3 (en) * 1986-10-30 1989-01-25 Sbm Wageneder Gesellschaft M.B.H. Impact mill for crushing rock or the like
AU593401B2 (en) * 1986-10-30 1990-02-08 Sbm Wageneder Gesellschaft M.B.H. Impact mill
EP0265580A2 (fr) * 1986-10-30 1988-05-04 SBM WAGENEDER Gesellschaft m.b.H. Broyeur à impact pour le broyage de roches ou semblables
GB2209688A (en) * 1987-09-15 1989-05-24 Kobe Steel Ltd Impact crushing
US4940188A (en) * 1987-12-24 1990-07-10 John Rodriguez Tip holder for mineral breaker
US4877192A (en) * 1988-06-06 1989-10-31 Rossouw Pieter J Rotary impact crusher main wear tip
US5131601A (en) * 1990-08-31 1992-07-21 Kabushiki Kaisha Kobe Seiko Sho Vertical impact crusher
GB2247418A (en) * 1990-08-31 1992-03-04 Kobe Steel Ltd Vertical impact crusher with cemented carbide chips
GB2247418B (en) * 1990-08-31 1994-07-13 Kobe Steel Ltd Vertical impact crusher
FR2676661A1 (fr) * 1991-05-23 1992-11-27 Drac Isere Concassage Sa Broyeur a axe vertical.
WO1995011086A1 (fr) * 1993-10-22 1995-04-27 Barmac Associates Limited Dispositifs de broyage de mineraux
EP0835690A1 (fr) 1996-10-11 1998-04-15 Van der Zanden, Johannes Petrus Andreas Josephus Procédé et dispositif de broyage par la collision synchronisée de matériau
WO2004020100A1 (fr) * 2002-08-28 2004-03-11 Sandvik Intellectual Property Hb Dispositif de retenue d'une piece d'usure d'un broyeur
US7257876B2 (en) 2002-08-28 2007-08-21 Sandvik Intellectual Property Ab Holder for a wear part of a crusher
CN100351018C (zh) * 2002-08-28 2007-11-28 山特维克知识产权股份有限公司 用于粉碎机磨损部件的支架
AU2003251279B2 (en) * 2002-08-28 2008-08-14 Sandvik Intellectual Property Ab A holder for a wear part of a crusher

Also Published As

Publication number Publication date
YU185685A (en) 1987-12-31
HUT41654A (en) 1987-05-28

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Inventor name: MUELLER, GUENTER