EP0511515B1 - Broyeur à cylindre pour floculation - Google Patents

Broyeur à cylindre pour floculation Download PDF

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Publication number
EP0511515B1
EP0511515B1 EP92105749A EP92105749A EP0511515B1 EP 0511515 B1 EP0511515 B1 EP 0511515B1 EP 92105749 A EP92105749 A EP 92105749A EP 92105749 A EP92105749 A EP 92105749A EP 0511515 B1 EP0511515 B1 EP 0511515B1
Authority
EP
European Patent Office
Prior art keywords
valve
pressure
accumulator
roll mill
return
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.)
Expired - Lifetime
Application number
EP92105749A
Other languages
German (de)
English (en)
Other versions
EP0511515A1 (fr
Inventor
Wilhelm Fetzer
Bruno Burkhard
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 AG
Original Assignee
Buehler AG
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 AG filed Critical Buehler AG
Publication of EP0511515A1 publication Critical patent/EP0511515A1/fr
Application granted granted Critical
Publication of EP0511515B1 publication Critical patent/EP0511515B1/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
    • B02C4/00—Crushing or disintegrating by roller mills
    • B02C4/28—Details
    • B02C4/286—Feeding devices

Definitions

  • the invention relates to a rolling mill, in particular a flaking mill according to the preamble of claim 1.
  • a flaking mill of this type is known for example from EP-A-0 271 828. It is essential that return lines are provided. So that these can act as return lines, they must open out above the nip, that is, above the point at which the rollers come closest to each other.
  • the junction can be selected such that the material to be flocculated is fed directly into the nip. However, it has been shown for some products that the junction was difficult to choose correctly. The reason for the particles falling in at different distances from the end of the rollers was initially not clear.
  • DE-A-26 15 585 discloses an improved sealing of the roll gap by means of a wedge arranged in front of the roll gap, which serves as a guide plate for the material to be treated. In this way, liquid material to be treated can escape laterally.
  • the invention is therefore based on the object of achieving a further equalization of the wear of the rolls in that the particles are brought into the roll gap at a predetermined distance from their ends. This is achieved in a surprisingly simple manner by the characterizing features of claim 1.
  • the invention is based on the knowledge gained through investigations that certain products tend to settle or settle in the return ducts, which occurs in particular on the return duct floor, thereby shifting the junction upwards.
  • the arrangement of at least one cleaning device ensures that the confluence point always remains at the same height.
  • Such a cleaning device can be designed differently within the scope of the invention and work in different ways.
  • an intermittent mode of operation can be provided in which brushes, e.g. with a rotary drive, are dipped into the return shaft from time to time.
  • the cleaning device is preferably designed in the sense of claim 2. In this case, a rigid arrangement is facilitated.
  • a rolling mill according to FIG. 1 has two rolls 1 and 2, one roll preferably being designed as a fixed roll and the further roll being pressed against it in parallel.
  • a nip 3 is formed between the two rolls 1 and 2, i.e. an area where the grains of the product are caught and crushed.
  • a filling box 4 with an internal mixing device is provided above the rollers 1 and 2, vertically above the nip 3, a filling box 4 with an internal mixing device is provided. From the filling box 4, the material to be treated is fed to the nip 3 via a feed roller 5.
  • return lines 6 are provided in a central area between the rolls 1 and 2, which are channel-shaped and open above the roll gap with a guide surface 7 into the area between the rolls.
  • the product return can be impaired by the application of a contamination layer made of fine particles of the product in the return line 6, in particular on the guide surface 7.
  • cleaning devices for the return lines are provided according to the invention.
  • at least one blow pipe 8 is provided for each return line 6, which ends at one end in the return line 6.
  • a compressed air device is provided to supply the blow pipes 8 with air, preferably consisting of a drive 9, a pump 10 and a switch 11 which switches the pump on and off.
  • a valve 12 can optionally be used to set one of at least two operating modes of the air supply to the blowpipes 8.
  • the simplest operating mode provides for a direct connection of the pump 10 via the valve 12 and lines 13 and 14 to the blowpipes 8. This operating mode is used during interruptions in operation and for shorter times during the operation of the rolling mill in order to remove deposits.
  • a special embodiment of an air blast device essentially consists of a pressure accumulator 15, which is fed by the pump 10 via the line 16 and the valve 12. Inside the pressure accumulator 15 is at least one end of a tube 17, the other end of which is closed and the interior 18 of which is connected to the blowpipes 8 via lines 19 and 14. The end of the tube 17 located in the pressure accumulator 15 is covered by a membrane 20 projecting beyond the tube cross section. The edge of the membrane 20 is contained in the wall of the pressure accumulator 15, so that the membrane 20 divides the pressure accumulator into two partial spaces 21 and 22. Of the Partial space 21 is delimited by the inner surface of the wall of the pressure accumulator 15, by the outer surface of the tube 17 lying in the pressure accumulator 15 and by the area of the membrane 20 which extends beyond the tube cross section.
  • the subspace 22 is located on the side of the membrane 20 opposite the tube 17 and serves to apply a contact pressure p1 of the membrane 20 to the end of the tube 17.
  • the air supply from the pump 10 via the valve 12, a line, is used to generate the contact pressure p1 24, a throttle valve 26, a check valve 25 and a contact pressure opening 23 to the subspace 22, as well as the venting of the subspace 22 through a throttle cross section 27. If the pressure in the subspace 21 rises above a certain value above the contact pressure p1, the membrane becomes as a result of its part projecting beyond the pipe cross section, which is under the increased pressure, lifted off, so that the spaces 21 and 18 are connected to one another.
  • a compressed air blast goes from the subspace 21 through the pipe interior 18, through the lines 19 and 14 and through the blow pipes 8 into the return lines 6.
  • the compressed air blast also goes through a line 27 and a check valve 28 into the subspace 22 , where the pressure increase causes the membrane 20 to be applied to the pipe opening and then the pressure in the subspace 21 to rise and thus the start of a new pressure surge cycle.
  • a special embodiment according to FIG. 2 provides 8 valve heads 29 at the ends of the blowpipes located in the return lines 6. These valve heads 29 have at least one, but possibly a plurality of nozzle openings 30 pointing in different directions.
  • a blow pipe 8 or a nozzle head 29 could also be moved along the respective return duct 6 if this should be necessary.
  • the device 15-28 is in itself arbitrary Modifiable, for example, that the membrane 20 is loaded by a spring instead of the action of the line 27.
  • a correspondingly controlled valve could also be used, for example with a manually operable control and / or an electronic control instead of the pneumatic interval control shown.

Landscapes

  • Engineering & Computer Science (AREA)
  • Food Science & Technology (AREA)
  • Cleaning In General (AREA)
  • Disintegrating Or Milling (AREA)
  • Sink And Installation For Waste Water (AREA)
  • Rigid Pipes And Flexible Pipes (AREA)
  • Mixers With Rotating Receptacles And Mixers With Vibration Mechanisms (AREA)
  • Fats And Perfumes (AREA)
  • Crushing And Grinding (AREA)

Claims (6)

  1. Broyeur à cylindres, en particulier pour floculation, pour produits granulaires, comportant au moins deux cylindres (1, 2), retenus ou appuyés l'un contre l'autre par l'intermédiaire d'un dispositif de pression, avec une amenée de produits par laquelle les matières peuvent être apportées par les deux côtés en passant par le dessus des extrémités axiales des cylindres, et des guides pour les produits, situés de part et d'autre des extrémités axiales desdits cylindres et couvrant, au moins en partie, la zone comprise entre les cylindres, et qui sont réalisés sous formes de conduits de renvoi (6) pour les matières introduites axialement par-dessus les extrémités des cylindres (1, 2), dans l'entre-deux cylindres (3), caractérisé en ce qu'au moins un dispositif de nettoyage (8) est prévu à l'intérieur d'au moins l'un des conduits de renvoi (6), pour nettoyer le conduit de renvoi (6).
  2. Broyeur à cylindres selon la revendication 1, caractérisé en ce que le dispositif de nettoyage de chaque guide de renvoi (6) comporte au moins un tube de soufflage (8).
  3. Broyeur à cylindres selon la revendication 2, caractérisé en ce qu'une pompe (10), une soufflante ou équivalent, étant équipé d'un interrupteur (11) et le cas échéant d'un distributeur à plusieur voies (12) sont prévus, de telle sorte que:
    a) la pompe (10) est raccordée directement aux tubes de soufflage (8), éventuellement par l'intermédiaire du distributeur (12), et qu'il se forme ainsi un flux de gaz de nettoyage continu, ou que
    b) la pompe (10) soit raccordée à un dispositif de projection de gaz (15-28), éventuellement par l'intermédiaire du distributeur (12), et que ce dispositif soit raccordé aux tubes de soufflage (8) de manière à envoyer aux tubes de soufflage (8) un flux de gaz de nettoyage intermittent.
  4. Broyeur à cylindres selon la revendication 3, caractérisé en ce que le dispositif de projection de gaz (15-28) comporte :
    - un accumulateur de pression (15);
    - un tuyau de décharge (17) dont une extrémité se trouve dans l'accumulateur de pression (15) et dont l'autre est obturée, et duquel part une conduite de raccordement (19) desservant les tubes de soufflage (8);
    - un dispositif (22) permettant l'établissement d'une pression de référence; et
    - un organe de vannage (20) pouvant être amené d'une position de fermeture à une position d'ouverture, comportant deux surfaces mutuellement opposées, dont l'une est asservie à la pression de l'accumulateur de pression (15), et l'autre à la pression de référence, l'organe de vannage (20) précité obturant la sortie de l'accumulateur de pression (15), et la dégageant dans sa position d'ouverture.
  5. Broyeur à cylindres selon la revendication 4, caractérisé en ce qu'au moins l'une des caractéristiques suivantes est prévue :
    a) la surface de l'organe de vannage (20) exposée à la pression de référence est plus grande que celle exposée à la pression de l'accumulateur;
    b) l'organe de vannage comprend une membrane (20) qui recouvre, de préférence en position de fermeture, l'extrémité intérieure du tuyau de décharge (17), et en dépasse notamment de telle sorte que la surface en dépassement se trouve asservie à la pression de l'accumulateur de pression;
    c) le dispositif de pression de référence comporte une enceinte de pression de référence (22) à laquelle de la pression peut être acheminée périodiquement par l'intermédiaire d'un orifice d'admission (23), puis évacuée de celle-ci par l'intermédiaire d'une section d'étranglement (31);
    d) il est prévu une conduite de renvoi (27) comprenant un clapet de non retour (28), qui part de l'intérieur (18) du tuyau de décharge (17) et va jusqu'à l'orifice de pression (23);
    e) il est prévu une conduite de renvoi (24) comprenant une soupape d'étranglement (26) et un clapet de non retour (25), qui est raccordée à la pompe (10) desservant l'accumulateur de pression (15) et a sa soupape d'étranglement (26) parallèle à l'accumulateur de pression (15), entre la pompe (10) et l'orifice d'admission (23).
  6. Broyeur à cylindres selon l'une quelconque des revendications 2 à 5, caractérisé en ce que les extrémités des tubes de soufflage (8) comprises dans les guides de renvoi (6) sont conçues sous forme de têtes de soupapes qui possèdent au moins un, et éventuellement plusieurs orifices de buses pointés dans des directions différentes.
EP92105749A 1991-04-30 1992-04-03 Broyeur à cylindre pour floculation Expired - Lifetime EP0511515B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4114081 1991-04-30
DE4114081A DE4114081A1 (de) 1991-04-30 1991-04-30 Flockierwalzwerk

Publications (2)

Publication Number Publication Date
EP0511515A1 EP0511515A1 (fr) 1992-11-04
EP0511515B1 true EP0511515B1 (fr) 1995-03-01

Family

ID=6430661

Family Applications (1)

Application Number Title Priority Date Filing Date
EP92105749A Expired - Lifetime EP0511515B1 (fr) 1991-04-30 1992-04-03 Broyeur à cylindre pour floculation

Country Status (7)

Country Link
US (1) US5246176A (fr)
EP (1) EP0511515B1 (fr)
AT (1) ATE119072T1 (fr)
DE (2) DE4114081A1 (fr)
DK (1) DK0511515T3 (fr)
ES (1) ES2071368T3 (fr)
GR (1) GR3015257T3 (fr)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL1026171C2 (nl) 2004-05-11 2005-11-14 Stork Titan Bv Vormen.
CA2960677C (fr) * 2016-04-28 2022-04-12 Gerard DEVLOO Broyeur d'echantillon de semence de canola
CN112675970B (zh) * 2020-11-30 2022-03-18 苏州太湖美药业有限公司 一种珍珠粉研磨加工用湿法粉碎端部装置

Family Cites Families (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3282199A (en) * 1965-05-28 1966-11-01 French Oil Mill Machinery Flaking or crushing rolls
GB1304006A (fr) * 1969-08-06 1973-01-24
US3667502A (en) * 1970-03-19 1972-06-06 Automatic Switch Co Self-recycling actuator and valve incorporating it
US3826280A (en) * 1973-02-16 1974-07-30 Us Army Quick-acting, self-resetting fluid pressure release valve assembly
NO742038L (fr) * 1973-06-08 1975-01-06 Sigge Rydberg
US3924652A (en) * 1973-09-18 1975-12-09 Jr Carl L C Kah Sequencing valve
US4114515A (en) * 1975-07-30 1978-09-19 Pauliukonis Richard S Adjustable self-reciprocating operator
DE2615585A1 (de) * 1976-04-09 1977-10-20 Helmut Schwerdtfeger Vorrichtung zum stirnseitigen abdichten eines walzenspalts
SU640052A1 (ru) * 1977-08-17 1978-12-30 Научно-исследовательский и проектный институт по газоочистным сооружениям, технике безопасности и охране труда в промышленности строительных материалов Пульсатор
DE3642974A1 (de) * 1986-12-17 1988-06-30 Buehler Ag Geb Walzwerk und verfahren zum zufuehren von koernigem gut
DE3707855A1 (de) * 1987-03-11 1988-09-22 Lonza Ag Vorrichtung zum stranggiessen von geschmolzenen materialien, insbesondere metalloxyden
US5102058A (en) * 1990-05-07 1992-04-07 Ag Processing Inc., A Cooperative Cheek plate for milling apparatus

Also Published As

Publication number Publication date
DE59201499D1 (de) 1995-04-06
DE4114081A1 (de) 1992-11-05
GR3015257T3 (en) 1995-06-30
US5246176A (en) 1993-09-21
ATE119072T1 (de) 1995-03-15
ES2071368T3 (es) 1995-06-16
EP0511515A1 (fr) 1992-11-04
DK0511515T3 (da) 1995-07-17

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