EP0540920A2 - Broyeur à impact - Google Patents

Broyeur à impact Download PDF

Info

Publication number
EP0540920A2
EP0540920A2 EP92117691A EP92117691A EP0540920A2 EP 0540920 A2 EP0540920 A2 EP 0540920A2 EP 92117691 A EP92117691 A EP 92117691A EP 92117691 A EP92117691 A EP 92117691A EP 0540920 A2 EP0540920 A2 EP 0540920A2
Authority
EP
European Patent Office
Prior art keywords
impact
sensor
impact body
wear
mill according
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
EP92117691A
Other languages
German (de)
English (en)
Other versions
EP0540920B1 (fr
EP0540920A3 (en
Inventor
Stefan Dipl.-Ing. Liebing
Helmut Dr. Zapf
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.)
Buehler GmbH
Original Assignee
Buehler 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 Buehler GmbH filed Critical Buehler GmbH
Publication of EP0540920A2 publication Critical patent/EP0540920A2/fr
Publication of EP0540920A3 publication Critical patent/EP0540920A3/de
Application granted granted Critical
Publication of EP0540920B1 publication Critical patent/EP0540920B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • B02C19/00—Other disintegrating devices or methods
    • B02C19/0012—Devices for disintegrating materials by collision of these materials against a breaking surface or breaking body and/or by friction between the material particles (also for grain)
    • B02C19/0018—Devices for disintegrating materials by collision of these materials against a breaking surface or breaking body and/or by friction between the material particles (also for grain) using a rotor accelerating the materials centrifugally against a circumferential breaking surface
    • B02C19/0025—Devices for disintegrating materials by collision of these materials against a breaking surface or breaking body and/or by friction between the material particles (also for grain) using a rotor accelerating the materials centrifugally against a circumferential breaking surface by means of a rotor with radially extending channels
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
    • B02B—PREPARING GRAIN FOR MILLING; REFINING GRANULAR FRUIT TO COMMERCIAL PRODUCTS BY WORKING THE SURFACE
    • B02B3/00—Hulling; Husking; Decorticating; Polishing; Removing the awns; Degerming

Definitions

  • the invention relates to an impact mill with a housing in which a centrifugal rotor which can be driven and rotated about an axis of rotation and an impact body which surrounds this centrifugal rotor are arranged.
  • Impact mills of this type are known in numerous embodiments and for a wide variety of purposes.
  • An example with a closed, annular impact body is shown in US Pat. No. 2,352,327, an impact body consisting of several segments is illustrated by DE-C-30 11 112. While the former impact mill for peeling nuts, in particular cereals with one of the grains surrounding shell, the latter is used to grind stone.
  • US-A-2,352,327 shows an impact ring that can be moved up and down, so that the wear is evened out over its surface. Although this extends the service life of such a ring, it is only possible to determine when the final time for a replacement has come when the mill is at a standstill.
  • DE-A-41 03 468 also deals with the problem of uniform wear, taking a different path than the US-A mentioned. But even here the problem remains unsolved to recognize the right time to replace the impact ring.
  • the invention is therefore based on the object of designing an impact mill of the type mentioned at the outset in such a way that it is unnecessary to switch off the mill for the purpose of checking the impact ring and the impact ring can nevertheless continue to function for as long as possible in order to reduce the frequency of replacement .
  • the impact body is assigned at least one sensor which functions during the operation of the mill and is provided for detecting at least the functionality, preferably also for determining the extent of wear of the impact body. This makes it possible to determine at any time whether the mill is properly equipped. Unexpected interruptions in the grinding operation can advantageously be avoided.
  • At least one sensor is assigned to each segment part, preferably its impact surface areas, in a further embodiment of the invention. This is also advantageous in the case of a closed ring, because the wear can sometimes be unilateral or different.
  • the senor is arranged to scan the impact body through an opening in its ring-shaped or cylindrical version of the impact body. This arrangement permits a particularly simple construction of the sensor and also enables retrofitting of impact mills already in use with one or - if appropriate - with several sensors.
  • a finger is provided on the impact body under the action of a loading device and enters the interior of its annular arrangement and design when the impact body is worn through, a switching signal for a display device from this position of the finger and / or can be derived for a shutdown device of the impact mill drive.
  • a switching signal for a display device from this position of the finger and / or can be derived for a shutdown device of the impact mill drive.
  • the opening in the socket for the impact body is designed as a slot opening, and that the finger is integrally connected to a spring arm which is supported on a stop surface of a finger carrier, preferably under the force of a leg spring .
  • This embodiment according to the invention advantageously represents a construction that can be used in the simplest way in all types of impact mills. It requires little space and only requires low manufacturing costs.
  • An impact mill has a housing 1 with a cover 2.
  • a centrifugal rotor 3 which can be driven to rotate by means of a motor 4.
  • a feed pipe 6 via which the nuts or grains can be fed to the center of the rotor 3. The grains are then thrown through the channels 5 due to the rotation about an axis of rotation 8 and the centrifugal force generated thereby against a baffle ring 7.
  • This impact ring 7 is therefore subject to increasing wear.
  • This wear and tear can be made more uniform by an angle alpha of the axis 10 of this impact ring 7 with respect to the axis 8 if the impact ring 7 is driven to rotate by a motor 9.
  • the details of this construction which is preferably used in the context of the invention, since the location of the attachment of a sensor is then relatively uncritical, can be found in the aforementioned DE-A-41 03 468.
  • the above-mentioned sensor provided according to the invention consists of a scanning finger 11, which can be seen particularly in FIG. 2, which rests on the outside of the baffle ring 7 under the action of a loading device through a slot opening 12 of a socket 13 receiving the baffle ring 7.
  • this loading device is formed by a spring arm 14 which is connected in one piece to the finger 11 and which is supported on a stop surface 15 of a finger carrier 16.
  • the finger 11 is not shown under the action of the spring arm 14 or one connected to the arms 11 and 14 Leg spring pressed into the interior of the slot 12 and through it. You will then be able to recognize this state of the impact ring 7 from the position of the arm 14 or to be able to sense it with the aid of a sensor (optical, with contact tongues electrical, inductive or capacitive) which senses the position of the arm 14. If the arm 14 itself is designed as a loading device, its position when the impact ring 7 wears will be indefinite. If an additional loading device (magnet, spring, gas spring or the like) is provided, the arm 14 will turn counterclockwise turn around a bolt 17 holding it.
  • the socket 13 will advantageously prevent the ring from falling apart and this socket is probably at least part of the outer surface of the baffle 7 should cover
  • this can of course also be done with other sensors instead of the mechanical sensor 11 shown.
  • FIG. 3 shows, for example, an ultrasound sensor 111 which is arranged opposite the outer wall of the impact ring 7.
  • the ultrasound sensor 111 preferably operates alternately in the transmission mode and in the reception mode in order to be able to carry out a distance measurement. If the outer wall of the baffle ring 7 is intact - as shown in full lines - the sensor 111 will only detect a relatively short distance. However, should the ring 7 break through in its central area opposite the sensor 111 because it is already too worn out, the ultrasonic waves will only be reflected by the opposite inner wall of the ring 7, i.e. the distance has increased accordingly.
  • a distance evaluation circuit 18 and a subsequent discrimination stage 19 in particular a simple threshold switch, to the sensor 111 in order to determine whether the received signals correspond to the short or long distance, which is indicated by a display device 20 (optical and / or acoustic) can be reported.
  • such a distance measuring system can be designed in any manner known per se, for example also as a basic distance measuring system. It would also be conceivable to provide a receiver on the inside of the impact ring 7 in order to operate the sensor 111 to a certain extent as a “barrier”, for example as a light barrier (if the sensor 111 is designed as a light transmitter). Of course you can the arrangement of transmitter and receiver can then be reversed and the transmitter inside, the receiver outside, can be arranged. Last but not least, the advantages of such an arrangement are that a clear signal is obtained even if the impact ring 7 is rotatably arranged, as can be seen from FIG. 1. Intermittent signals are then produced when the slot or slot opening 12 that has been worn out passes. However, it is also understood that a plurality of sensors can be provided over the height of the impact ring, and that a number of such slot openings (and, if appropriate, sensors) can also be distributed.
  • a vibration generator 111 ' can be dispensed with if one assumes that the grains bouncing against the inner wall of the baffle ring itself produce vibrations which - with a relatively constant supply of the grains - are also proportionate will be regular.
  • a light source 22 carried by a holder 23 protruding into the impact ring 7 emits light against the inner surface of the impact ring 7. As long as this inner surface is still intact, the light is reflected against a photoelectric converter 311 (dashed beam).
  • FIG. 6 A particularly simple variant can be seen in FIG. 6.
  • a cylinder sleeve 24 is fastened to the housing cover 2, in which an inner sleeve 25 is guided telescopically.
  • This inner sleeve 25 is fastened to the end of a tension spring 26 which is connected to a force transducer 411.
  • a threshold switch cf. 19
  • FIG. 6 shows a rotor disk 103 without internal channels (possibly with radial centrifugal walls), in the middle of which the material to be impacted is fed in via a chute 106.
  • FIG. 7 illustrates an indirect determination of the degree of wear of the impact ring 7, in which the impacted material is then subjected to an analysis of the efficiency of the impact process in an analysis device 27.
  • samples are taken within the analysis device 27, for example, which should help determine the degree of peeling or the degree of comminution of the material.
  • the device 27 may include an image analysis device as is known per se and is described, for example, in DE-A-40 29 202.
  • the grains, preferably in an ordered position and at a predetermined speed, are presented to a video camera which is connected to an image analyzer for determining the color and / or size.
  • Another possibility is to design the analyzing device 27 with a separating device, in particular with an air classifier, through which the shells can be separated from the cores. The amount of shells is then compared to the amount of cores, which checks the peeling result can. Conclusions about the degree of wear of the impact ring 7 can then be drawn from this peeling result.

Landscapes

  • Engineering & Computer Science (AREA)
  • Food Science & Technology (AREA)
  • Graft Or Block Polymers (AREA)
  • Developing Agents For Electrophotography (AREA)
  • Compositions Of Macromolecular Compounds (AREA)
  • Crushing And Grinding (AREA)
  • Measurement Of Mechanical Vibrations Or Ultrasonic Waves (AREA)
  • Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)
  • Crushing And Pulverization Processes (AREA)
EP92117691A 1991-11-07 1992-10-16 Broyeur à impact Expired - Lifetime EP0540920B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4136575A DE4136575A1 (de) 1991-11-07 1991-11-07 Prallmuehle
DE4136575 1991-11-07

Publications (3)

Publication Number Publication Date
EP0540920A2 true EP0540920A2 (fr) 1993-05-12
EP0540920A3 EP0540920A3 (en) 1993-12-29
EP0540920B1 EP0540920B1 (fr) 1997-03-26

Family

ID=6444226

Family Applications (1)

Application Number Title Priority Date Filing Date
EP92117691A Expired - Lifetime EP0540920B1 (fr) 1991-11-07 1992-10-16 Broyeur à impact

Country Status (4)

Country Link
US (1) US5407141A (fr)
EP (1) EP0540920B1 (fr)
AT (1) ATE150669T1 (fr)
DE (2) DE4136575A1 (fr)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SE532108C2 (sv) * 2004-12-08 2009-10-27 Aake Faektenmark Träningsanordning
US7172144B1 (en) * 2006-03-09 2007-02-06 Dennis Slater System for measuring wear in a grinding mill
EP4163012B1 (fr) * 2021-10-05 2025-08-13 Bühler AG Anneau d'impact et dispositif de décorticage amélioré

Family Cites Families (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2352327A (en) * 1942-03-07 1944-06-27 Quaker Oats Co Grain huller
US2941732A (en) * 1958-02-12 1960-06-21 Reserve Mining Co Dimensional indicator for inaccessible location
ZA747312B (en) * 1973-11-17 1975-12-31 Kloeckner Humboldt Deutz Ag Method of determining and setting the width of the crushing gap and of measuring crushing tool wear in a a rotary crushing by aultrsonicmeans, and torary crusher for carrying out the method
DE2434837C2 (de) * 1974-07-19 1976-08-19 Hazemag Andreas Kg Prallmuehle mit einer mahlbahn, die aus nebeneinander geschichteten schlag- oder pralleisten besteht
SU1146084A1 (ru) * 1983-10-25 1985-03-23 Криворожский Ордена Трудового Красного Знамени Горно-Рудный Институт Система автоматического управлени измельчительным комплексом
AT389653B (de) * 1985-09-10 1990-01-10 Schroedl Hermann Verfahren zur einstellung der spaltweite eines kegelbrechers od.dgl.
US4820980A (en) * 1987-05-04 1989-04-11 Dodson Edgars Darryl Gap, wear and tram measurement system and method for grinding machines
SE456138B (sv) * 1987-09-10 1988-09-12 Boliden Ab Forfarande for reglering av krosspaltbredden i en gyratorisk kross
DD301241A7 (de) * 1990-01-02 1992-11-05 Energiewerke Schwarze Pumpe Ag,De Einrichtung zur grenzwertanzeige des schlagplattenverschleisses an schlagraedern
DD301325A7 (de) * 1990-01-02 1992-12-03 Energiewerke Schwarze Pumpe Ag,De Vorrichtung zur anzeige der grenznutzungsdauer von schlagraedern
DE4029202A1 (de) * 1990-09-14 1992-03-19 Buehler Ag Verfahren zum sortieren von partikeln eines schuettgutes und vorrichtungen hierfuer
DE4103468C2 (de) * 1991-02-06 2001-07-12 Buehler Gmbh Prallmühle

Also Published As

Publication number Publication date
DE4136575A1 (de) 1993-05-13
ATE150669T1 (de) 1997-04-15
EP0540920B1 (fr) 1997-03-26
EP0540920A3 (en) 1993-12-29
DE59208266D1 (de) 1997-04-30
US5407141A (en) 1995-04-18

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