EP0405102A1 - Procédé et appareillage pour le broyage de matière - Google Patents

Procédé et appareillage pour le broyage de matière Download PDF

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Publication number
EP0405102A1
EP0405102A1 EP90108848A EP90108848A EP0405102A1 EP 0405102 A1 EP0405102 A1 EP 0405102A1 EP 90108848 A EP90108848 A EP 90108848A EP 90108848 A EP90108848 A EP 90108848A EP 0405102 A1 EP0405102 A1 EP 0405102A1
Authority
EP
European Patent Office
Prior art keywords
roller
adjustable
pressure
gap
nip
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Withdrawn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
EP90108848A
Other languages
German (de)
English (en)
Inventor
Michael Dr.-Ing. Von Seebach
Otto Dipl.-Ing. Heinemann
Günter Dipl.-Ing. Milewski
Werner Dipl.-Ing. Schössler
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.)
ThyssenKrupp Industrial Solutions AG
Original Assignee
Krupp Polysius 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 Krupp Polysius AG filed Critical Krupp Polysius AG
Publication of EP0405102A1 publication Critical patent/EP0405102A1/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Withdrawn legal-status Critical Current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
    • B02C4/00—Crushing or disintegrating by roller mills
    • B02C4/28—Details
    • B02C4/32—Adjusting, applying pressure to, or controlling the distance between, milling members

Definitions

  • the invention relates to a method (according to the preamble of claim 1) and a device (according to the preamble of claim 5) for crushing ground material.
  • brittle regrind for example cement clinker
  • material bed roller mills of which one roller is arranged in a stationary manner and the other roller is supported in a resilient manner.
  • the invention is therefore based on the object of providing a method (according to the preamble of claim 1) and a device (according to the preamble of claim 5) for comminuting regrind, which are less complex in terms of plant technology, simpler operation and higher Characterize grinding efficiency and a reduced tendency to vibrate.
  • the adjustable roller is first pressed (during the adjustment process) with the supply of the ground material in the direction of the stationary roller with such high force that the roller gap adjusts to a value at which a predetermined grinding pressure is present in the roller gap. Then this set nip is fixed by determining the position of the adjustable roller. The actual grinding process then takes place with rollers fixed with respect to the size of the nip.
  • a set nip results in an approximately constant throughput at constant roller speed and approximately constant feed material. This includes a certain grinding pressure in the narrowest part of the nip, which - as will be explained in more detail - can be determined by suitable measuring devices.
  • the optimal size reduction of the material to be ground depends on the thickness of the bowl (i.e. the size of the nip in the narrowest area) exclusively on the applied pressing force, i.e. from the grinding pressure.
  • the specified roller length of the machine, together with the pressing force, determines the drive torque of the rollers and, together with the speed, the drive power and the throughput.
  • a predetermined grinding pressure in the narrowest roller gap can be set in a simple manner by the setting and fixing of the roller gap according to the invention, the maximum permissible torque the roller shaft and the specific power required for the shredding performance.
  • the roll gap is fixed, small changes in the regrind (e.g. certain fluctuations in grindability and / or grain size) are absorbed by the elasticity of the flakes, especially if - viewed over the length of the rolls - it is only local or temporary Changes. Although this leads to peaks in force and torque, it varies from the machine structure and the drive to a multiple of the nominal value can be included.
  • the mode of operation according to the invention with a fixed roller gap guarantees the highest possible energy utilization.
  • the material bed roller mill illustrated in the drawing contains two drivable rollers 1 and 2, which together form a roller nip 3 loaded with regrind.
  • the two rollers 1 and 2 are supported at their axial ends by means of bearings 4 in bearing stones 5 and 6, respectively, the bearing stones 5, 6 being carried by a base plate 7 and being guided in guides 8.
  • the roller 1 is supported on a stop 9 and thus represents a stationary roller.
  • the roller 2 is adjustable for setting the nip 3 and is fixed in position after setting the nip 3.
  • a clamping system which contains four tie rods 10 which pass through the bearing blocks 5 and 6. At one end (on the right in FIG. 1) the tie rods 10 rest on tie rod heads 11 on the outer end face of the bearing stones 5. At the other end, 10 hydraulic cylinder-piston arrangements 12 are arranged on the tie rods. As shown in FIG. 3 in detail, the cylinder 13 is firmly connected to the tie rod 10, while the piston 14 rests on the end of the movable bearing blocks 6 facing away from the roll gap 3.
  • the chamber 15 present between the cylinder 13 and the piston 14 is connected to a pressure medium reservoir 18 via a check valve 16 and a pressure medium pump 17.
  • a control valve 19 enables direct discharge of the pressure medium from the chamber 15 into the pressure medium reservoir 18.
  • the piston 14 of the cylinder-piston arrangement 12 is designed as a double-walled, hydraulically fixable sleeve which contains an annular cylindrical chamber 14a and which forms the static friction element of a fixing device by means of which the adjustable roller 2 can be fixed in a predetermined position.
  • the chamber 14a of the piston 14 is connected to the pressure medium reservoir 18 via a check valve 20 and a pressure medium pump 21.
  • a control valve 22 enables pressure relief of the chamber 14a.
  • Spacers 23 are located between the bearing stones 5 and 6 provided by which the nip 3 is limited to a minimum value during the adjustment process. Furthermore, a stop 24 is provided which limits the movement of the movable bearing stones 6 to the outside.
  • measuring devices which serve to determine the grinding pressure prevailing in the nip 3.
  • strain gauges 5 and 6 can be arranged on the tie rods 10 in the area between the bearing stones.
  • Another possibility is to provide annular pressure force sensors between the tie rod heads 11 and the bearing blocks 5 of the fixed roller 1. In both cases, the signals from the individual measuring devices are expediently fed to an averager and processed into an averaged signal.
  • Spacers 25 fix the rollers 1 and 2 in their position between the bearing stones 5 and 6.
  • roller mill operating according to the method according to the invention is - in particular with regard to the setting and fixing of the roller gap and the overload protection - as follows:
  • the mill is started up in the released, depressurized state of the fixing device; the chamber 14a of the piston 14 is thus connected to the pressure medium reservoir 18 via the control valve 22.
  • the piston 14 is accordingly freely displaceable on the associated tie rod 10.
  • the now displaceable roll 2 is pressed away from the stationary roll 1, in fact until the cylinders 13 connected to the lower tie rods 10 come to rest against the stop 24 (this stop is expediently adjustable).
  • this stop is expediently adjustable.
  • the roll gap 3 increases and a starting grinding pressure is set which depends, inter alia, on the drawing-in conditions in the gap and on the frictional conditions when the bearing stones 6 are moved.
  • the jewels 6 of the adjustable roller 2 are displaced by the tensioning system in the direction of the stationary roller 1 by introducing pressure medium into the chambers 15 of the cylinders 13 through the pressure medium pump 17 and thereby displacing the pistons 14 and the movable jewels 6 to the right.
  • the tensile force occurring in the tie rods 10 is measured, the adjustable roller 2 being held exactly parallel to the stationary roller 1 at the same time.
  • the size of the nip 3 is expediently measured at at least two points.
  • the four cylinder-piston arrangements 12 are acted on differently and in this way an exact parallelism of both rollers is ensured.
  • the pistons 14 are supplied to the chambers 14a via the pressure medium pump 21.
  • the piston 14, which forms a double-walled, hydraulically fixable sleeve, is thereby expanded inwards and outwards in the radial direction and is clamped between the cylinder 13 and the tie rod 10. So that the bearing blocks 6 are fixed on the tie rods 10, and the nip 3 is fixed in size. Now the chamber 15 of the cylinder-piston assemblies 12 relieved of pressure by actuating the control valve 19, and the grinding operation is carried out.
  • the pistons 14 of the fixing devices In the pressurized state, the pistons 14 of the fixing devices generate a frictional connection with the associated tie rods 10.
  • the holding force is dependent on the hydraulic pressure applied. Since all four fixing devices are connected to one another by pipes, the holding force generated is the same for the four fixing devices.
  • the piston 14 in question slips on the associated tie rod 10.
  • a shear tube (not shown in the drawing) is sheared off, which is contained in the system for supplying the hydraulic pressure medium to the chamber 14a. This suddenly reduces the pressure in all four fixing devices.
  • the grist feed to the mill is stopped or the entire mill is switched off.
  • the bearing blocks 6 of the adjustable roller 2 can now be moved freely up to the stop 24.
  • the mill can be started up again in the manner already explained by first (by supplying pressure medium) to chamber 15 of the cylinder 13) the roller gap 3 is set to the predetermined value and then (by renewed pressure medium supply to the chambers 14a of the pistons 14) the adjustable roller 2 and thus the roller gap 3 are fixed.
  • each hydraulically lockable sleeve i.e. each piston 14
  • the hydraulic pressure in these sleeves of the locking devices when a predetermined grinding pressure is exceeded by opening the annular cylindrical chambers 14a associated control valve 22 can be abruptly dismantled, whereby the adjustable roller 2 is then released immediately.
  • Appropriate control connections can be used when opening the one control valve of the one fixing device to ensure that the control valves 22 of the other fixing device are also opened immediately, e.g. the predetermined grinding pressure has only been exceeded in one of the chambers 14a.

Landscapes

  • Engineering & Computer Science (AREA)
  • Food Science & Technology (AREA)
  • Crushing And Grinding (AREA)
EP90108848A 1989-06-28 1990-05-10 Procédé et appareillage pour le broyage de matière Withdrawn EP0405102A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19893921181 DE3921181A1 (de) 1989-06-28 1989-06-28 Verfahren und vorrichtung zum zerkleinern von mahlgut
DE3921181 1989-06-28

Publications (1)

Publication Number Publication Date
EP0405102A1 true EP0405102A1 (fr) 1991-01-02

Family

ID=6383778

Family Applications (1)

Application Number Title Priority Date Filing Date
EP90108848A Withdrawn EP0405102A1 (fr) 1989-06-28 1990-05-10 Procédé et appareillage pour le broyage de matière

Country Status (2)

Country Link
EP (1) EP0405102A1 (fr)
DE (1) DE3921181A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0574718A2 (fr) * 1992-06-17 1993-12-22 Krupp Polysius Ag Méthode de commande d'un broyeur à cylindres à lit de matière
DE19839162A1 (de) * 1998-08-28 2000-03-02 Bauermeister Verfahrenstechnik Verfahren zum Einstellen des Walzspaltes bei Zerkleinerungswalzwerken

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4234481A1 (de) * 1992-10-13 1994-04-14 Krupp Polysius Ag Walzenmühle
DE4320668A1 (de) * 1993-06-22 1995-01-05 Krupp Polysius Ag Walzenmühle

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1535363A (fr) * 1966-08-31 1968-08-02 Rose Laminoirs
FR2328513A1 (fr) * 1975-10-24 1977-05-20 Simon Ltd Henry Moulins a cylindres utilises dans l'industrie de la minoterie
DE3016785A1 (de) * 1980-04-30 1981-12-17 Gebrüder Bühler AG, 9240 Uzwil Hydraulisches mehrwalzwerk

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1065998A (en) * 1907-07-11 1913-07-01 Power And Mining Machinery Company Crushing-rolls.
DE1757093C3 (de) * 1968-03-29 1978-10-19 Alpine Ag, 8900 Augsburg Walzenmühle zur Feinmahlung
DE3037670A1 (de) * 1980-10-04 1981-10-22 Fried. Krupp Gmbh, 4300 Essen Walzenbrecher
DE3238630A1 (de) * 1982-10-19 1984-04-19 Karl Händle & Söhne Maschinenfabrik u. Eisengießerei, GmbH & Co KG, 7130 Mühlacker Maschine zum zerkleinern von gut, insbesondere von keramischem oder aehnlichem mahlgut
DE3707745C2 (de) * 1987-03-11 1999-07-22 Buehler Ag Verfahren und Anlage zur Steuerung der Vermahlung einer teigig-pastösen Masse
DE8712742U1 (fr) * 1987-09-22 1987-11-05 Grachtrup, Heinz, Dipl.-Ing., 4722 Ennigerloh, De

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1535363A (fr) * 1966-08-31 1968-08-02 Rose Laminoirs
FR2328513A1 (fr) * 1975-10-24 1977-05-20 Simon Ltd Henry Moulins a cylindres utilises dans l'industrie de la minoterie
DE3016785A1 (de) * 1980-04-30 1981-12-17 Gebrüder Bühler AG, 9240 Uzwil Hydraulisches mehrwalzwerk

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0574718A2 (fr) * 1992-06-17 1993-12-22 Krupp Polysius Ag Méthode de commande d'un broyeur à cylindres à lit de matière
EP0574718A3 (fr) * 1992-06-17 1994-03-23 Krupp Polysius Ag
DE19839162A1 (de) * 1998-08-28 2000-03-02 Bauermeister Verfahrenstechnik Verfahren zum Einstellen des Walzspaltes bei Zerkleinerungswalzwerken
DE19839162B4 (de) * 1998-08-28 2011-11-10 Bauermeister Verfahrenstechnik Gmbh Verfahren zum Einstellen des Walzspaltes bei Zerkleinerungswalzwerken

Also Published As

Publication number Publication date
DE3921181A1 (de) 1991-01-03

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