EP3572152B1 - Distributing and metering device for a roller mill, roller mill with such a distributing and metering device and method for grinding material - Google Patents

Distributing and metering device for a roller mill, roller mill with such a distributing and metering device and method for grinding material Download PDF

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Publication number
EP3572152B1
EP3572152B1 EP18174239.6A EP18174239A EP3572152B1 EP 3572152 B1 EP3572152 B1 EP 3572152B1 EP 18174239 A EP18174239 A EP 18174239A EP 3572152 B1 EP3572152 B1 EP 3572152B1
Authority
EP
European Patent Office
Prior art keywords
milling
filling level
metering device
distributing
feeding roller
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.)
Active
Application number
EP18174239.6A
Other languages
German (de)
French (fr)
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EP3572152A1 (en
Inventor
Daniel Mark
Daniel Rickenbach
Stefan SALZMANN
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
Priority to EP18174239.6A priority Critical patent/EP3572152B1/en
Priority to ES18174239T priority patent/ES2824761T3/en
Priority to US17/058,667 priority patent/US11618033B2/en
Priority to PCT/EP2019/059131 priority patent/WO2019223930A1/en
Priority to BR112020023940-2A priority patent/BR112020023940A2/en
Priority to EP19716172.2A priority patent/EP3801909B1/en
Priority to JP2020565791A priority patent/JP2021524804A/en
Priority to RU2020142761A priority patent/RU2757420C1/en
Priority to KR1020207036706A priority patent/KR102430868B1/en
Priority to CN201980035241.0A priority patent/CN112236233B/en
Priority to DK19716172.2T priority patent/DK3801909T3/en
Priority to CA3101404A priority patent/CA3101404C/en
Priority to EP19725761.1A priority patent/EP3592464A1/en
Priority to RU2020142810A priority patent/RU2755504C1/en
Priority to PCT/EP2019/063644 priority patent/WO2019224399A1/en
Priority to BR112020023672-1A priority patent/BR112020023672B1/en
Priority to JP2020565876A priority patent/JP6953642B2/en
Priority to CN202210198533.XA priority patent/CN114534852B/en
Priority to MX2020012603A priority patent/MX2020012603A/en
Priority to KR1020207037065A priority patent/KR102320757B1/en
Priority to CN201980046037.9A priority patent/CN112384301B/en
Priority to KR1020217034574A priority patent/KR102647490B1/en
Priority to US17/058,412 priority patent/US11185867B2/en
Priority to AU2019272929A priority patent/AU2019272929B2/en
Publication of EP3572152A1 publication Critical patent/EP3572152A1/en
Application granted granted Critical
Publication of EP3572152B1 publication Critical patent/EP3572152B1/en
Priority to MX2021012001A priority patent/MX2021012001A/en
Priority to JP2021159213A priority patent/JP7326397B2/en
Priority to AU2021261834A priority patent/AU2021261834B2/en
Priority to US17/528,912 priority patent/US11865547B2/en
Priority to JP2023008641A priority patent/JP2023052592A/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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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
    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
    • B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
    • B02C23/00—Auxiliary methods or auxiliary devices or accessories specially adapted for crushing or disintegrating not provided for in preceding groups or not specially adapted to apparatus covered by a single preceding group
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
    • B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
    • B02C23/00—Auxiliary methods or auxiliary devices or accessories specially adapted for crushing or disintegrating not provided for in preceding groups or not specially adapted to apparatus covered by a single preceding group
    • B02C23/02—Feeding devices
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
    • B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
    • B02C25/00—Control arrangements specially adapted for crushing or disintegrating
    • 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
    • B02C4/02—Crushing or disintegrating by roller mills with two or more 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
    • B02C4/42—Driving mechanisms; Roller speed control

Definitions

  • the invention relates to a distribution metering device for a roller mill and a roller mill with a distribution metering device according to the invention.
  • the invention further relates to a method for grinding regrind with a roller mill, which comprises a distribution-metering device according to the invention.
  • the ground material is introduced into the center of the inlet of the respective grinding passage and accumulated.
  • the regrind is then distributed to the outside by gravitation, if necessary with the help of a paddle roller, and conveyed through the feed roller into the grinding gap.
  • the fill level of the inlet is first set manually, for example by an operator, as the target level. It must be taken into account that on the one hand there is enough free buffer volume available (level as low as possible), but on the other hand the regrind reaches the ends of the discharge unit (level as high as possible). With a measuring device (e.g. force transducer), a deviation of the actual level from the target level is detected during operation. A control device ensures that the discharge is adjusted so that the actual level corresponds as far as possible to the target level.
  • Force transducers have the disadvantage that the fill level of the material to be ground is not measured directly, but indirectly, and therefore a calibration must be carried out, which is strongly dependent on the properties of the material to be ground.
  • a disadvantage of such roller mills is that the operator must manually define the fill level as the target level. This "empirical" setting of the target level should also ensure that the distribution of regrind along the length of the feed roller is ensured. The distribution of regrind along the feed roller is checked / monitored only visually, if at all. In operation it happens that, if the desired level is unsuitable and / or the distribution device is unsuitably preset, the regrind does not reach the ends of the discharge unit. Correct setting is also difficult for the person skilled in the art. If the grinding material properties change during operation, the risk of an accident is even greater in critical passages with the state of the art.
  • a roller mill with a distribution metering device with a level sensor is, for example, in US-4619408-A disclosed.
  • the distribution-metering device comprises a housing with at least one regrind inlet and at least one regrind outlet and a feed roller arranged in the housing for dosing regrind into a grinding gap of the roller mill through the regrind outlet, which can be rotated about an axis of the feed roller.
  • the distribution-metering device further comprises a conveyor shaft arranged in the housing for distributing regrind along the feed roller, which can be rotated about an axis of the conveyor shaft, the axis of the conveyor shaft being arranged parallel to the axis of the feed roller, and a first level sensor arranged in the housing for determining a first regrind fill level of the Housing.
  • individual sensors for example sensor strips
  • the distribution metering device further comprises a second fill level sensor arranged in the housing for the determination a second regrind fill level of the housing, the regrind inlet and the first fill level sensor being arranged at a first end of the feed roller and the conveyor shaft, and the second fill level sensor being arranged at a second end of the feed roller and the feed shaft.
  • “at a first end” or “at a second end” means that the first or second sensor is arranged in each case in a first or last third of the feed roller.
  • the fill level sensors are preferably arranged in the first and last quarters of the feed roller.
  • the range specifications relate to the length of the feed roller in the axial direction.
  • the distribution-metering device is usually arranged above the grinding rollers of a roller mill.
  • Grist is fed to the housing of the distribution and dosing device and forms a storage there, which serves as a buffer for operating the roller mill, so that small fluctuations in mass flow can be smoothed out.
  • the feed roller then conveys the regrind to the regrind outlet of the distribution metering device and from there into the grinding gap.
  • the feed roller axis is preferably arranged parallel to the roller axis of the grinding rollers of the roller mill.
  • a conveyor shaft is provided to ensure the distribution of the ground material along the feed roller. Rotation of the conveyor shaft ensures that regrind is conveyed in one direction along the axis of the conveyor shaft, so that distribution of regrind is supported by gravity.
  • the conveyor shaft is preferably designed as a screw conveyor or paddle roller.
  • a conveying area of the conveying shaft ie the area of the conveying shaft which effects the conveying of regrind, preferably extends over at least half the axial length of the feed roller, preferably over the entire axial length of the feed roller.
  • the conveying shaft also causes a mixture of regrind in the distribution metering device, which counteracts segregation by cone formation (in particular through the sieve effect).
  • the regrind inlet is arranged at a first end of the feed roller and the conveyor shaft. This means that regrind is not fed in the center of the feed roller as in known devices but in an end region of the feed roller and the conveyor shaft.
  • the first fill level sensor for determining a first fill level is also located in this end region. The height of the ground material can be determined with the first level sensor.
  • a second level sensor is arranged at the other end of the feed roller and the conveyor shaft. This means that a second regrind fill level, i.e. the height of the regrind, can be determined.
  • a fill level sensor is thus arranged at both ends of the feed roller (and the conveyor shaft).
  • the lateral arrangement of the regrind inlet and the inventive arrangement of the fill level sensors allow conclusions to be drawn as to whether the feed roller is supplied with enough regrind over its entire length.
  • the feed roller and the conveyor shaft are preferably movable independently of one another. This means that the feed roller and / or the feed shaft have a dedicated drive and are not, as is known from the prior art, driven feed roller and feed shaft coupled.
  • the feed roller and the conveyor shaft preferably have their own drive.
  • the speed of the feed roller can preferably be controlled or regulated as a function of the first regrind fill level. This means that the speed of the feed roller is set depending on the first regrind fill level determined by the first fill level sensor.
  • the feed roller is preferably driven at a low speed if the first grist fill level is low. The speed is then increased if the first grist level rises.
  • the first regrind fill level is kept essentially constant by a corresponding control unit.
  • the setpoint for this can be permanently programmed into the control unit, dependent on other factors or adjustable by an operator.
  • the speed the feed roller is adjusted depending on the deviation between the setpoint and actual value of the first grist level.
  • the speed of the conveyor shaft is preferably also controllable or regulatable depending on the second mill level. This means that the speed of the conveyor shaft is set as a function of the second regrind fill level determined by the second fill level sensor.
  • the conveyor shaft is preferably driven at a first speed if the second grinding material fill level is low. The speed is then reduced if the second grist level rises.
  • the second regrind fill level is kept essentially constant by a corresponding control unit.
  • the setpoint for this can be permanently programmed into the control unit, dependent on other factors or adjustable by an operator.
  • the speed of the conveyor shaft is adjusted depending on the deviation between the setpoint and actual value of the second regrind level.
  • the regrind outlet is preferably designed as a gap between the feed roller and a throttle device.
  • the throttle device preferably comprises a rotatable profile with a circular cross-section.
  • a profile can, for example, be produced from a circular profile simply by removing / grinding a section of a circle. It is advantageous that a metering edge of the profile is stiffer than in known solutions, in which the throttle device comprises a flap which is composed of a plurality of elements. The elements must then be aligned to form a straight dispensing edge.
  • a profile with a circular cross-section is more rigid than known solutions.
  • a gap width of the gap can preferably be controlled or regulated depending on the first regrind fill level.
  • the feed roller is particularly preferably operated at a constant speed and the regrind discharge quantity is set only over the gap width.
  • the distribution metering device preferably comprises a guide arrangement for guiding regrind to the feed roller.
  • the guide arrangement is preferably designed as a sliding surface.
  • the guide arrangement ends with an edge which is spaced from the feed roller between 0.001 and 5 mm.
  • the edge is arranged in a radial section through the feed roller with an angular distance between 0 ° and 90 ° with respect to a solder through the feed roller axis. In other words, the edge is located between 9 a.m. and 12 p.m.
  • Distribution metering device is made possible. In addition, cleaning / emptying the remainder of the metering device is simplified.
  • the distribution-metering device further comprises a control unit which is operatively connected to the first and second fill level sensors and by means of which the feed roller and / or the feed shaft can be controlled / regulated.
  • the control unit is arranged in a control cabinet with a cooling system which comprises at least one Peltier element.
  • the control unit serves to control / regulate the rotation of the feed roller and the conveyor shaft and controls these in particular depending on the first or second fill level.
  • other sensors can be operatively connected to the control unit, which are also used to control / regulate the feed roller and the feed shaft.
  • control unit Due to the environmental properties of a roller mill, the control unit must be protected against external influences (dust), on the one hand, and, for safety reasons (risk of dust explosion), it must be safely taken up as a possible ignition source and separated from the environment.
  • Previous solutions proposed a central control cabinet from which the entire system (several roller mills) was fed and controlled. The installation effort is very high, since many cables have to be laid from the control cabinet to the respective machine. This installation effort is eliminated with a control cabinet located directly on the distribution and dosing device. In particular, only 3 lines have to be connected to the control unit (power supply; data transmission, e.g. BUS; safety shutdown).
  • the device can be installed and configured at the factory and only has to be connected to the respective line at the place of assembly according to the "plug-and-play concept".
  • the control cabinet comprises at least one Peltier element for cooling the interior of the control cabinet.
  • the insulation between the outside and the inside is advantageous here, so that possible ignition sources are not connected to the roller mill environment.
  • the invention further relates to a roller mill with a distribution-metering device according to the invention. All of the advantages and developments of the metering device described above can therefore also be used accordingly for a roller mill according to the invention.
  • the roller mill comprises at least two rollers which define a roller gap for grinding ground material, the roller gap being supplied with ground material from the ground material outlet of the distribution-metering device.
  • the invention further relates to a method for grinding regrind in a roller mill.
  • the roller mill in this case comprises a distribution-metering device according to the invention. All of the advantages and developments of the metering device and the roller mill described above can therefore also be used accordingly for a method according to the invention.
  • regrind is fed to the roll mill via a distribution-metering device according to the invention.
  • Grist is fed to the distribution dosing device via the grist inlet and then leaves the distribution dosing device through the grist outlet.
  • a speed of rotation of the feed roller is preferably controlled or regulated as a function of the first grist fill level.
  • the speed of the feed roller is adjusted in particular proportionally to a deviation between a setpoint of the first millbase fill level and the actual value of the first millbase fill level.
  • a speed of the conveyor shaft is preferably controlled or regulated as a function of the second mill level.
  • the speed of the conveyor shaft is in particular adjusted in inverse proportion to a deviation between a setpoint of the second millbase fill level and the actual value of the second millbase fill level.
  • the distribution metering device is designed with a regrind outlet designed as a gap between the feed roller and a throttle device, a gap width of the gap is controlled or regulated depending on the first regrind fill level.
  • the speed of the feed roller is in particular kept constant (i.e. not changed during operation).
  • the gap width is adapted in particular proportionally to a deviation between a setpoint of the first millbase fill level and the actual value of the first millbase fill level.
  • a roller mill comprising at least two rollers arranged in a housing, a regrind inlet, a regrind outlet and a control unit for controlling and / or regulating the roller mill.
  • the control unit is arranged in a control cabinet with cooling, the control cabinet on the roller mill, in particular on the housing, is arranged.
  • the cooling comprises at least one Peltier element.
  • control unit Due to the environmental properties of a roller mill, the control unit must be protected against external influences (dust), on the one hand, and, for safety reasons (risk of dust explosion), it must be safely taken up as a possible ignition source and separated from the environment.
  • Previous solutions proposed a central control cabinet from which the entire system (several roller mills) was fed and controlled. The installation effort is very high, since many cables have to be laid from the control cabinet to the respective machine. This installation effort is eliminated with a control cabinet located directly on the distribution and dosing device. In particular, only 3 lines need to be connected to the control unit (power supply; data transmission, e.g. BUS; safety shutdown).
  • the device can already be installed and configured at the factory and only has to be connected to the respective line at the place of assembly according to the "plug and play concept".
  • the control cabinet comprises at least one Peltier element for cooling the interior of the control cabinet.
  • the insulation between the outside and the inside is advantageous here, so that possible ignition sources are not connected to the roller mill environment.
  • the distribution and metering device 1 comprises a housing 2 with a regrind inlet 3 and a regrind outlet 4.
  • a feed roller 5 rotatable about a feed roller axis SA and above the feed roller 5 in the regrind flow direction.
  • the conveyor shaft is designed as a screw conveyor and can be rotated about the conveyor shaft axis FA, which is parallel to the feed roller axis SA.
  • Motors 15 and 16 are provided for driving the feed roller 5 and the conveyor shaft 6, respectively.
  • the motors 15 and 16 are operatively connected to a control unit 12 (shown schematically by the dashed line).
  • two level sensors 7 and 8 are arranged, which are designed to determine the ground level in the housing and are also in operative connection with the control unit 12.
  • the first fill level sensor 7 is in the area of the regrind inlet 3 at a first end of the feed roller 5 and the conveyor shaft 6 arranged.
  • the second fill level sensor 8 is arranged at the other end of the feed roller 5 and the conveyor shaft 6. Two level sensors 7 and 8 are thus arranged at the two ends of the feed roller 5 and the conveyor shaft 6.
  • the regrind inlet 3 is likewise not in the center, as in known devices, but is arranged above the first end of the feed roller 5 and the conveyor shaft 6.
  • a throttle device 10 which is used to set a gap 9, which serves as regrind outlet 4 of the housing 2.
  • the throttle device 10 comprises an elongated profile 11 with a cross-section in the form of a circular section.
  • the gap width of the gap 9 can be set by rotating the profile 11 (represented schematically by the dashed position).
  • the guide arrangement ends with an edge 19 close to the surface of the feed roller 5.
  • the edge 19 is arranged such that no regrind can get under the feed roller 5 or no regrind can remain in the dining area;
  • the edge 19 can be arranged at an angular distance of 0 ° to 90 ° with respect to a solder through the feed roller axis SA. With this arrangement, a dead space around the feed roller is reduced and the residual emptying / cleaning of the distribution metering device 1 is facilitated.
  • a casing 20 joins the edge 19 for sealing.
  • the dining area for the most part surrounds the feed roller (discharge roller), as a result of which a dead zone forms below the feed roller (discharge roller), which cannot be completely emptied during operation and would therefore have to be cleaned manually at a standstill.
  • This dead zone can be an unwanted one Location for insects, etc.
  • regrind When operating the distribution metering device 1, regrind is fed through the regrind inlet 3. By rotating the conveyor shaft 6, the ground material is conveyed from the first end in the direction of the second end of the feed roller 6. This distribution is monitored by the second fill level sensor 8. If the second regrind fill level (actual value) measured by the second fill level sensor 8 deviates from a target value of the second regrind fill level, the speed of the feed shaft 6 is adjusted accordingly, so that more or less regrind is conveyed to the other end of the feed roller 5.
  • the feed roller 5 is driven. If the first regrind fill level (actual value) measured by the first fill level sensor 7 deviates from a target value of the first regrind fill level, the speed of the feed roller 5 is adjusted accordingly, so that more or less regrind is discharged so that the fill level of the housing remains constant
  • a roller mill 14 with a distribution metering device 1 is visible.
  • the control cabinet 13 which is arranged on the roller mill and which houses the control unit 12 and is cooled by Peltier elements 17 (of which only cooling fins are visible).
  • Other ATEX-compliant cooling systems are also conceivable, for example liquid cooling systems, in particular water cooling systems; ATEX-compliant fans; Etc.

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  • Engineering & Computer Science (AREA)
  • Food Science & Technology (AREA)
  • Crushing And Grinding (AREA)
  • Filling Or Emptying Of Bunkers, Hoppers, And Tanks (AREA)
  • Disintegrating Or Milling (AREA)

Description

Die Erfindung betrifft eine Verteil-Dosiervorrichtung für einen Walzenstuhl sowie einen Walzenstuhl mit einer erfindungsgemässen Verteil-Dosiervorrichtung. Die Erfindung betrifft ferner ein Verfahren zum Mahlen von Mahlgut mit einem Walzenstuhl, welcher eine erfindungsgemässe Verteil-Dosiervorrichtung umfasst.The invention relates to a distribution metering device for a roller mill and a roller mill with a distribution metering device according to the invention. The invention further relates to a method for grinding regrind with a roller mill, which comprises a distribution-metering device according to the invention.

Bei Walzenstühlen aus dem Stand der Technik wird das Mahlgut mittig in den Einlauf der jeweiligen Mahlpassage eingeführt und aufgestaut. Das Mahlgut wird dann durch Gravitation, ggf mit Hilfe einer Paddelwalze, nach aussen verteilt und durch die Speisewalze in den Mahlspalt befördert.In the case of roller mills from the prior art, the ground material is introduced into the center of the inlet of the respective grinding passage and accumulated. The regrind is then distributed to the outside by gravitation, if necessary with the help of a paddle roller, and conveyed through the feed roller into the grinding gap.

Am Beginn des Mahlvorganges wird zuerst die Füllhöhe des Einlaufes manuell, z.B. von einem Operator, als Soll-Niveau vorgegeben. Dabei ist zu berücksichtigen, dass zum einen genügend freies Puffervolumen zur Verfügung steht (Niveau möglichst tief), aber zum anderen das Mahlgut bis zu den Enden der Austragseinheit gelangt (Niveau möglichst hoch). Mit einer Messvorrichtung (zum Beispiel Kraftaufnehmer) wird beim Betreiben eine Abweichung des Ist-Niveaus zum Soll-Niveau detektiert. Eine Regelvorrichtung stellt sicher, dass der Austrag so angepasst wird, dass das Ist-Niveau möglichst dem Soll-Niveau entspricht. Kraftaufnehmer haben den Nachteil, dass der Füllstand des Mahlguts nicht direkt, sondern indirekt gemessen wird und somit eine Kalibrierung vorgenommen werden muss, welche stark von den Mahlguteigenschaften abhängt. Dies ist bei allen anderen Messprinzipien beim Stand der Technik ebenfalls der Fall (zum Beispiel kapazitive Sensoren), wenn auch weniger ausgeprägt. Beim Stand der Technik fliesst im einfachsten Fall das Mahlgut nur dank der Gravitation in Richtung der Enden der Austragseinheit. Somit kann nicht in jedem Fall gewährleistet werden, dass bei den Enden der Austragseinheit Mahlgut vorhanden ist und zu den Walzenenden ausgetragen werden kann. Wird an den Walzenenden kein Mahlgut in den Mahlspalt gefördert, kann es zu schwerwiegenden Schäden kommen. Ebenfalls zum Stand der Technik gehören Verteilvorrichtungen (zum Beispiel Paddelwalzen), welche den Transport des Mahlguts zu den Enden der Austragseinheit unterstützen. Nachteilig bei allen zum Stand der Technik gehörenden Systemen ist, dass diese Verteilerfunktion nicht im Betrieb automatisch und unabhängig vom Mahlgut gesteuert oder geregelt wird.At the beginning of the grinding process, the fill level of the inlet is first set manually, for example by an operator, as the target level. It must be taken into account that on the one hand there is enough free buffer volume available (level as low as possible), but on the other hand the regrind reaches the ends of the discharge unit (level as high as possible). With a measuring device (e.g. force transducer), a deviation of the actual level from the target level is detected during operation. A control device ensures that the discharge is adjusted so that the actual level corresponds as far as possible to the target level. Force transducers have the disadvantage that the fill level of the material to be ground is not measured directly, but indirectly, and therefore a calibration must be carried out, which is strongly dependent on the properties of the material to be ground. This is the case with all other measuring principles State of the art also the case (for example capacitive sensors), although less pronounced. In the simplest case, the regrind in the prior art only flows thanks to the gravitation in the direction of the ends of the discharge unit. Thus, it cannot be guaranteed in every case that regrind is present at the ends of the discharge unit and can be discharged to the roller ends. If no regrind is fed into the grinding gap at the roller ends, serious damage can result. The prior art also includes distribution devices (for example paddle rollers) which support the transport of the ground material to the ends of the discharge unit. A disadvantage of all systems belonging to the prior art is that this distributor function is not controlled or regulated automatically during operation and independently of the regrind.

Nachteilig bei solchen Walzenstühlen ist, dass der Operator manuell die Füllhöhe als Soll-Niveau definieren muss. Diese "empirische" Einstellung des Soll-Niveaus soll auch sicherstellen, dass die Verteilung von Mahlgut entlang der Länge der Speisewalze gewährleistet wird. Eine Überprüfung/Überwachung der Verteilung von Mahlgut entlang der Speisewalze findet, wenn überhaupt, nur visuell statt. Im Betrieb kommt es vor, dass bei ungeeigneter Wahl des Soll-Niveaus und/oder bei ungeeigneter Voreinstellung der Verteileinrichtung das Mahlgut nicht bis zu den Enden der Austragseinheit gelangt. Die korrekte Einstellung ist auch für den Fachmann schwierig. Bei sich im Betrieb ändernden Mahlguteigenschaften ist bei kritischen Passagen mit dem Stand der Technik das Risiko für einen Störfall noch grösser. Zum anderen ist es wichtig, dass bei der mittigen Produkteinführung das Mahlgut nicht entmischt ist, da das Produkt im Einlauf nicht vermischt wird. Das Risiko für entmischtes Mahlgut im Einlauf ist besonders dann gegeben, wenn durch zwei oder mehr zuführende Rohre unterschiedliche Mahlgutqualitäten in den Einlauf fliessen. Ein Walzenstuhl mit einer Verteil-Dosiervorrichtung mit einem Füllstandsensor ist z.B. in US-4619408-A offenbart.A disadvantage of such roller mills is that the operator must manually define the fill level as the target level. This "empirical" setting of the target level should also ensure that the distribution of regrind along the length of the feed roller is ensured. The distribution of regrind along the feed roller is checked / monitored only visually, if at all. In operation it happens that, if the desired level is unsuitable and / or the distribution device is unsuitably preset, the regrind does not reach the ends of the discharge unit. Correct setting is also difficult for the person skilled in the art. If the grinding material properties change during operation, the risk of an accident is even greater in critical passages with the state of the art. On the other hand, it is important that the regrind is not separated when the product is introduced in the center, since the product is not mixed in the inlet. The risk of segregated regrind in the inlet is particularly high if there are two or more feeds Pipes of different grist quality flow into the inlet. A roller mill with a distribution metering device with a level sensor is, for example, in US-4619408-A disclosed.

Es ist daher Aufgabe der vorliegenden Erfindung eine Verteil-Dosiervorrichtung für einen Walzenstuhl sowie einen Walzenstuhl anzugeben, welche die Nachteile des Bekannten vermeiden und insbesondere eine optimale Verteilung von Mahlgut entlang der Dosierwelle ermöglichen. Ferner soll damit eine Vermischung des Mahlgutes im Einlaufbereich unterstützt werden.It is therefore an object of the present invention to provide a distribution and metering device for a roller mill and a roller mill which avoid the disadvantages of the known and in particular enable optimal distribution of regrind along the metering shaft. Mixing of the regrind in the inlet area is also to be supported.

Die Aufgabe wird von einer Verteil-Dosiervorrichtung, einem Walzenstuhl und einem Verfahren mit den Merkmalen der unabhängigen Ansprüche gelöst.The object is achieved by a distribution metering device, a roller mill and a method with the features of the independent claims.

Die Verteil-Dosiervorrichtung umfasst ein Gehäuse mit wenigstens einem Mahlguteinlass und wenigstens einem Mahlgutauslass sowie eine im Gehäuse angeordnete Speisewalze zum Dosieren von Mahlgut in einen Mahlspalt des Walzenstuhls durch den Mahlgutauslass, welche um eine Speisewalzenachse drehbar ist.The distribution-metering device comprises a housing with at least one regrind inlet and at least one regrind outlet and a feed roller arranged in the housing for dosing regrind into a grinding gap of the roller mill through the regrind outlet, which can be rotated about an axis of the feed roller.

Die Verteil-Dosiervorrichtung umfasst ferner eine im Gehäuse angeordnete Förderwelle zum Verteilen von Mahlgut entlang der Speisewalze, welche um eine Förderwellenachse drehbar ist, wobei die Förderwellenachse parallel zur Speisewalzenachse angeordnet ist, und einen ersten im Gehäuse angeordneten Füllstandsensor zur Ermittlung eines ersten Mahlgut-Füllstandes des Gehäuses. Es versteht sich, dass auch einzelne Sensoren (bspw. Sensorleisten) zusammengeschaltet werden können, um bspw. eine grössere Höhe mit einem solchermassen kombinierten Fullstandsensor abdecken zu können.The distribution-metering device further comprises a conveyor shaft arranged in the housing for distributing regrind along the feed roller, which can be rotated about an axis of the conveyor shaft, the axis of the conveyor shaft being arranged parallel to the axis of the feed roller, and a first level sensor arranged in the housing for determining a first regrind fill level of the Housing. It goes without saying that individual sensors (for example sensor strips) can also be interconnected in order, for example, to be able to cover a greater height with such a combined full-level sensor.

Erfindungsgemäss umfasst die Verteil-Dosiervorrichtung ferner einen zweiten im Gehäuse angeordneten Füllstandsensor zur Ermittlung eines zweiten Mahlgut-Füllstandes des Gehäuses, wobei der Mahlguteinlass und der erste Füllstandsensor bei einem ersten Ende der Speisewalze und der Förderwelle angeordnet sind, und der zweite Füllstandsensor bei einem zweiten Ende der Speisewalze und der Förderwelle angeordnet ist.According to the invention, the distribution metering device further comprises a second fill level sensor arranged in the housing for the determination a second regrind fill level of the housing, the regrind inlet and the first fill level sensor being arranged at a first end of the feed roller and the conveyor shaft, and the second fill level sensor being arranged at a second end of the feed roller and the feed shaft.

Mit "bei einem ersten Ende" bzw. "bei einem zweiten Ende" wird im Sinne der vorliegenden Erfindung gemeint, dass der erste bzw. zweite Sensor jeweils bei einem ersten bzw. letzten Drittel der Speisewalze angeordnet ist. Bevorzugt sind die Füllstandsensoren jeweils beim ersten und letzten Viertel der Speisewalze angeordnet. Die Bereichsangaben beziehen sich auf die Länge der Speisewalze in axialer Richtung.In the context of the present invention, “at a first end” or “at a second end” means that the first or second sensor is arranged in each case in a first or last third of the feed roller. The fill level sensors are preferably arranged in the first and last quarters of the feed roller. The range specifications relate to the length of the feed roller in the axial direction.

Die Verteil-Dosiervorrichtung wird in der Regel oberhalb der Mahlwalzen eines Walzenstuhls angeordnet. Mahlgut wird dem Gehäuse der Verteil-Dosiervorrichtung zugeführt und bildet dort einen Speicher, welcher als Puffer für das Betreiben des Walzenstuhls dient, so dass kleine Massenstromschwankungen geglättet werden können. Die Speisewalze fördert dann das Mahlgut zum Mahlgutauslass der Verteil-Dosiervorrichtung und von dort in den Mahlspalt. Die Speisewalzenachse ist bevorzugt parallel zur Walzenachse der Mahlwalzen des Walzenstuhls angeordnet.The distribution-metering device is usually arranged above the grinding rollers of a roller mill. Grist is fed to the housing of the distribution and dosing device and forms a storage there, which serves as a buffer for operating the roller mill, so that small fluctuations in mass flow can be smoothed out. The feed roller then conveys the regrind to the regrind outlet of the distribution metering device and from there into the grinding gap. The feed roller axis is preferably arranged parallel to the roller axis of the grinding rollers of the roller mill.

Um die Verteilung des Mahlgutes entlang der Speisewalze sicherzustellen ist eine Förderwelle vorgesehen. Durch Drehung der Förderwelle wird gewährleistet, dass Mahlgut in eine Richtung entlang der Förderwellenachse gefördert wird, so dass damit eine Verteilung von Mahlgut durch Schwerkraft unterstützt wird. Die Förderwelle ist dabei bevorzugt als Förderschnecke oder Paddelwalze ausgebildet. Ferner bevorzugt erstreckt sich ein Förderbereich der Förderwelle, d.h. der Bereich der Förderwelle, welcher eine Förderung von Mahlgut bewirkt, über mindestens die Hälfte der axialen Länge der Speisewalze, bevorzugt über die gesamte axiale Länge der Speisewalze.A conveyor shaft is provided to ensure the distribution of the ground material along the feed roller. Rotation of the conveyor shaft ensures that regrind is conveyed in one direction along the axis of the conveyor shaft, so that distribution of regrind is supported by gravity. The conveyor shaft is preferably designed as a screw conveyor or paddle roller. Furthermore, a conveying area of the conveying shaft, ie the area of the conveying shaft which effects the conveying of regrind, preferably extends over at least half the axial length of the feed roller, preferably over the entire axial length of the feed roller.

Durch diesen Aufbau wird somit sichergestellt, dass die Speisewalze über ihre gesamte Länge mit Mahlgut versorgt wird und somit der Mahlspalt nicht bereichsweise ohne Mahlgutzufuhr betrieben wird. Die Förderwelle bewirkt zudem eine Vermischung von Mahlgut in der Verteil-Dosiervorrichtung, welche einer Entmischung durch Schüttkegelbildung (insbesondere durch den Siebeffekt) entgegenwirkt.This construction thus ensures that the feed roller is supplied with regrind over its entire length and thus the grinding gap is not operated in some areas without supply of regrind. The conveying shaft also causes a mixture of regrind in the distribution metering device, which counteracts segregation by cone formation (in particular through the sieve effect).

Der Mahlguteinlass ist bei einem ersten Ende der Speisewalze und der Förderwelle angeordnet. Das bedeutet, dass Mahlgut nicht wie bei bekannten Vorrichtungen in der Mitte der Speisewalze sondern in einem Endbereich der Speisewalze und der Förderwelle zugeführt wird. In diesem Endbereich befindet sich auch der erste Füllstandsensor zur Ermittlung eines ersten Mahlgut-Füllstandes. Mit dem ersten Füllstandsensor ist die Höhe des Mahlguts ermittelbar.The regrind inlet is arranged at a first end of the feed roller and the conveyor shaft. This means that regrind is not fed in the center of the feed roller as in known devices but in an end region of the feed roller and the conveyor shaft. The first fill level sensor for determining a first fill level is also located in this end region. The height of the ground material can be determined with the first level sensor.

Ein zweiter Füllstandsensor ist beim anderen Ende der Speisewalze und der Förderwelle angeordnet. Damit ist ein zweiter Mahlgut-Füllstand, d.h die Höhe des Mahlguts, ermittelbar.A second level sensor is arranged at the other end of the feed roller and the conveyor shaft. This means that a second regrind fill level, i.e. the height of the regrind, can be determined.

Somit ist an beiden Enden der Speisewalze (und der Förderwelle) je ein Füllstandsensor angeordnet. Die seitliche Anordnung des Mahlguteinlasses und die erfindungsgemässe Anordnung der Füllstandsensoren lässt Rückschlüsse zu, ob die Speisewalze über ihre gesamte Länge mit genug Mahlgut versorgt ist.A fill level sensor is thus arranged at both ends of the feed roller (and the conveyor shaft). The lateral arrangement of the regrind inlet and the inventive arrangement of the fill level sensors allow conclusions to be drawn as to whether the feed roller is supplied with enough regrind over its entire length.

Die Speisewalze und die Förderwelle sind dabei bevorzugt unabhängig voneinander bewegbar. Das bedeutet, dass die Speisewalze und/oder der Förderwelle über einen dedizierten Antrieb verfügen und nicht, wie aus dem Stand der Technik bekannt, Speisewalze und Förderwelle gekoppelt angetrieben werden. Bevorzugt verfügen die Speisewalze und die Förderwelle über einen eigenen Antrieb.The feed roller and the conveyor shaft are preferably movable independently of one another. This means that the feed roller and / or the feed shaft have a dedicated drive and are not, as is known from the prior art, driven feed roller and feed shaft coupled. The feed roller and the conveyor shaft preferably have their own drive.

Bevorzugt ist die Drehzahl der Speisewalze abhängig vom ersten Mahlgut-Füllstand steuerbar oder regelbar. Das bedeutet, dass die Drehzahl der Speisewalze in Abhängigkeit des vom ersten Füllstandsensor ermittelten, ersten Mahlgut-Füllstandes eingestellt wird.The speed of the feed roller can preferably be controlled or regulated as a function of the first regrind fill level. This means that the speed of the feed roller is set depending on the first regrind fill level determined by the first fill level sensor.

Bevorzugt wird die Speisewalze mit einer niedrigen Drehzahl angetrieben, falls der erste Mahlgut-Füllstand niedrig ist. Die Drehzahl wird dann erhöht, falls der erste Mahlgut-Füllstand steigt.The feed roller is preferably driven at a low speed if the first grist fill level is low. The speed is then increased if the first grist level rises.

Insbesondere kann vorgesehen werden, dass durch eine entsprechende Kontrolleinheit der erste Mahlgut-Füllstand im Wesentlichen konstant gehalten wird. Der Sollwert hierzu kann fest in der Kontrolleinheit einprogrammiert sein, von anderen Faktoren abhängig oder von einem Operator einstellbar sein. Die Drehzahl der Speisewalze wird dabei abhängig von der Abweichung zwischen Sollwert und Istwert des ersten Mahlgut-Füllstandes angepasst.In particular, it can be provided that the first regrind fill level is kept essentially constant by a corresponding control unit. The setpoint for this can be permanently programmed into the control unit, dependent on other factors or adjustable by an operator. The speed the feed roller is adjusted depending on the deviation between the setpoint and actual value of the first grist level.

Die Drehzahl der Förderwelle ist bevorzugt ebenfalls abhängig vom zweiten Mahlgut-Füllstand steuerbar oder regelbar. Das bedeutet, dass die Drehzahl der Förderwelle in Abhängigkeit des vom zweiten Füllstandsensor ermittelten, zweiten Mahlgut-Füllstandes eingestellt wird.The speed of the conveyor shaft is preferably also controllable or regulatable depending on the second mill level. This means that the speed of the conveyor shaft is set as a function of the second regrind fill level determined by the second fill level sensor.

Bevorzugt wird die Förderwelle mit einer ersten Drehzahl angetrieben, falls der zweite Mahlgut-Füllstand niedrig ist. Die Drehzahl wird dann gesenkt, falls der zweite Mahlgut-Füllstand steigt.The conveyor shaft is preferably driven at a first speed if the second grinding material fill level is low. The speed is then reduced if the second grist level rises.

Insbesondere kann vorgesehen werden, dass durch eine entsprechende Kontrolleinheit der zweite Mahlgut-Füllstand im Wesentlichen konstant gehalten wird. Der Sollwert hierzu kann fest in der Kontrolleinheit einprogrammiert sein, von anderen Faktoren abhängig oder von einem Operator einstellbar sein. Die Drehzahl der Förderwelle wird dabei abhängig von der Abweichung zwischen Sollwert und Istwert des zweiten Mahlgut-Füllstandes angepasst.In particular, it can be provided that the second regrind fill level is kept essentially constant by a corresponding control unit. The setpoint for this can be permanently programmed into the control unit, dependent on other factors or adjustable by an operator. The speed of the conveyor shaft is adjusted depending on the deviation between the setpoint and actual value of the second regrind level.

Durch die Änderung der Drehzahl der Speisewalze wird entsprechend mehr oder weniger Mahlgut ausgetragen. Die Messung des zweiten Mahlgut-Füllstandes und die entsprechende Drehung der Förderwelle stellen dabei sicher, dass Mahlgut über die gesamte Länge der Speisewalze verteilt wird. Zudem wird das Mahlgut durch die Förderwelle vermischt.By changing the speed of the feed roller, more or less regrind is discharged accordingly. The measurement of the second regrind fill level and the corresponding rotation of the conveyor shaft ensure that regrind is distributed over the entire length of the feed roller. In addition, the regrind is mixed by the conveyor shaft.

Der Mahlgutauslass ist bevorzugt als Spalt zwischen der Speisewalze und einer Drosselvorrichtung ausgebildet.The regrind outlet is preferably designed as a gap between the feed roller and a throttle device.

Die Drosselvorrichtung umfasst dabei bevorzugt ein drehbares Profil mit einem kreisabschnittförmigen Querschnitt. Ein solches Profil kann beispielsweise aus einem kreisrunden Profil einfach durch Abtragen/Abschleifen eines Kreisabschnittes hergestellt werden. Vorteilhaft ist dabei, dass eine Dosierkante des Profils steifer ist als bei bekannten Lösungen, bei welchen die Drosselvorrichtung eine Klappe umfasst, die aus einer Mehrzahl von Elementen zusammengesetzt ist. Die Elemente müssen dann ausgerichtet werden, um eine gerade Dosierkante auszubilden. Zudem ist ein Profil mit einem kreisabschnittförmigen Querschnitt biegesteifer als bekannten Lösungen.The throttle device preferably comprises a rotatable profile with a circular cross-section. Such a profile can, for example, be produced from a circular profile simply by removing / grinding a section of a circle. It is advantageous that a metering edge of the profile is stiffer than in known solutions, in which the throttle device comprises a flap which is composed of a plurality of elements. The elements must then be aligned to form a straight dispensing edge. In addition, a profile with a circular cross-section is more rigid than known solutions.

Bei einer solchen Vorrichtung mit einem als Spalt zwischen der Speisewalze und einer Drosselvorrichtung ausgebildeten Mahlgutauslass ist bevorzugt eine Spaltweite des Spaltes abhängig vom ersten Mahlgut-Füllstand steuerbar oder regelbar. Besonders bevorzugt wird in einem solchen Fall die Speisewalze mit einer konstanten Drehzahl betrieben und die Mahlgut-Austragmenge lediglich über die Spaltbreite eingestellt.In such a device with a regrind outlet designed as a gap between the feed roller and a throttle device, a gap width of the gap can preferably be controlled or regulated depending on the first regrind fill level. In such a case, the feed roller is particularly preferably operated at a constant speed and the regrind discharge quantity is set only over the gap width.

Die Verteil-Dosiervorrichtung umfasst bevorzugt eine Leitanordnung zum Leiten von Mahlgut zur Speisewalze. Die Leitanordnung ist dabei bevorzugt als Rutschfläche ausgebildet. Die Leitanordnung endet mit einer Kante, die von der Speisewalze zwischen 0.001 und 5 mm beabstandet angeordnet ist. Dabei ist die Kante im Radialschnitt durch die Speisewalze mit einem Winkelabstand zwischen 0° und 90° bezüglich eines Lots durch die Speisewalzenachse angeordnet. Anders ausgedrückt ist die Kante zwischen 9 Uhr und 12 Uhr angeordnet.The distribution metering device preferably comprises a guide arrangement for guiding regrind to the feed roller. The guide arrangement is preferably designed as a sliding surface. The guide arrangement ends with an edge which is spaced from the feed roller between 0.001 and 5 mm. The edge is arranged in a radial section through the feed roller with an angular distance between 0 ° and 90 ° with respect to a solder through the feed roller axis. In other words, the edge is located between 9 a.m. and 12 p.m.

Eine solche Anordnung der Kante erlaubt die Minimierung von Toträumen um die Speisewalze, so dass eine verbesserte Hygiene derSuch an arrangement of the edge allows the minimization of dead spaces around the feed roller, so that an improved hygiene of the

Verteil-Dosiervorrichtung ermöglicht wird. Zudem wird eine Reinigung/Restenleerung der Verteil-Dosiervorrichtung vereinfacht.Distribution metering device is made possible. In addition, cleaning / emptying the remainder of the metering device is simplified.

Die Verteil-Dosiervorrichtung umfasst ferner eine Kontrolleinheit, welche mit dem ersten und zweiten Füllstandsensor in Wirkverbindung steht und mittels welcher die Speisewalze und/oder die Förderwelle steuerbar/regelbar sind. Die Kontrolleinheit ist dabei in einem Schaltschrank mit einer Kühlung angeordnet, welche wenigstens ein Peltier-Element umfasst.The distribution-metering device further comprises a control unit which is operatively connected to the first and second fill level sensors and by means of which the feed roller and / or the feed shaft can be controlled / regulated. The control unit is arranged in a control cabinet with a cooling system which comprises at least one Peltier element.

Die Kontrolleinheit dient der Steuerung/Regelung der Drehung der Speisewalze und der Förderwelle und steuert/regelt diese insbesondere abhängig vom ersten bzw. zweiten Mahlgut-Füllstand. Selbstverständlich können weitere Sensoren mit der Kontrolleinheit in Wirkverbindung stehen, welche ebenfalls zur Steuerung/Regelung der Speisewalze und der Förderwelle herangezogen werden.The control unit serves to control / regulate the rotation of the feed roller and the conveyor shaft and controls these in particular depending on the first or second fill level. Of course, other sensors can be operatively connected to the control unit, which are also used to control / regulate the feed roller and the feed shaft.

Aufgrund der Umgebungseigenschaften eines Walzenstuhls muss die Kontrolleinheit zum einen vor äusseren Einflüssen (Staub) geschützt werden, zum anderen muss sie aus Sicherheitsgründen (Staubexplosionsgefahr) als mögliche Zündquelle sicher und von der Umwelt abgetrennt aufgenommen werden. Bisherige Lösungen schlugen einen zentralen Schaltschrank vor, aus welchem die gesamte Anlage (mehrere Walzenstühle) gespeist und gesteuert/geregelt wird. Der Installationsaufwand ist dabei sehr gross, da viele Leitungen vom Schaltschrank bis zur jeweiligen Maschine verlegt werden müssen. Mit einem direkt an der Verteil-Dosiervorrichtung angeordneten Schaltschrank entfällt dieser Installationsaufwand. Es müssen insbesondere lediglich 3 Leitungen mit der Kontrolleinheit verbunden werden (Stromzufuhr; Datenübertragung, z.B. BUS; Sicherheitsabschaltung). Somit kann die Vorrichtung bereits ab Werk installiert und konfiguriert und muss am Ort der Montage lediglich nach dem "Plug-and-Play-Konzept" mit der jeweiligen Leitung verbunden werden. Um die beim Betrieb entstehende Wärme abzuführen umfasst der Schaltschrank wenigstens ein Peltier-Element zum Kühlen des Innenraumes des Schaltschrankes.Due to the environmental properties of a roller mill, the control unit must be protected against external influences (dust), on the one hand, and, for safety reasons (risk of dust explosion), it must be safely taken up as a possible ignition source and separated from the environment. Previous solutions proposed a central control cabinet from which the entire system (several roller mills) was fed and controlled. The installation effort is very high, since many cables have to be laid from the control cabinet to the respective machine. This installation effort is eliminated with a control cabinet located directly on the distribution and dosing device. In particular, only 3 lines have to be connected to the control unit (power supply; data transmission, e.g. BUS; safety shutdown). Thus, the device can be installed and configured at the factory and only has to be connected to the respective line at the place of assembly according to the "plug-and-play concept". In order to dissipate the heat generated during operation, the control cabinet comprises at least one Peltier element for cooling the interior of the control cabinet.

Vorteilhaft ist hierbei die Isolierung zwischen Aussen- und Innenraum, so dass mögliche Zündquellen nicht mit der Walzenstuhlumgebung in Verbindung stehen.The insulation between the outside and the inside is advantageous here, so that possible ignition sources are not connected to the roller mill environment.

Die Erfindung betrifft ferner einen Walzenstuhl mit einer erfindungsgemässen Verteil-Dosiervorrichtung. Sämtliche, oben beschriebene Vorteile und Weiterbildungen der Verteil-Dosiervorrichtung sind somit auch für einen erfindungsgemässen Walzenstuhl entsprechend anwendbar.The invention further relates to a roller mill with a distribution-metering device according to the invention. All of the advantages and developments of the metering device described above can therefore also be used accordingly for a roller mill according to the invention.

Der Walzenstuhl umfasst wenigstens zwei Walzen, die einen Walzenspalt zum Mahlen von Mahlgut definieren, wobei der Walzenspalt mit Mahlgut aus dem Mahlgutauslass der Verteil-Dosiervorrichtung versorgt wird.The roller mill comprises at least two rollers which define a roller gap for grinding ground material, the roller gap being supplied with ground material from the ground material outlet of the distribution-metering device.

Die Erfindung betrifft ferner ein Verfahren zum Mahlen von Mahlgut in einem Walzenstuhl. Der Walzenstuhl umfasst dabei eine erfindungsgemässe Verteil-Dosiervorrichtung. Sämtliche, oben beschriebene Vorteile und Weiterbildungen der Verteil-Dosiervorrichtung und des Walzenstuhls sind somit auch für ein erfindungsgemässes Verfahren entsprechend anwendbar.The invention further relates to a method for grinding regrind in a roller mill. The roller mill in this case comprises a distribution-metering device according to the invention. All of the advantages and developments of the metering device and the roller mill described above can therefore also be used accordingly for a method according to the invention.

Erfindungsgemäss wird Mahlgut zum Walzenstuhl über eine erfindungsgemässe Verteil-Dosiervorrichtung zugeführt.According to the invention, regrind is fed to the roll mill via a distribution-metering device according to the invention.

Mahlgut wird der Verteil-Dosiervorrichtung über den Mahlguteinlass zugeführt und verlässt dann die Verteil-Dosiervorrichtung durch den Mahlgutauslass.Grist is fed to the distribution dosing device via the grist inlet and then leaves the distribution dosing device through the grist outlet.

Bevorzugt wird eine Drehzahl der Speisewalze abhängig vom ersten Mahlgut-Füllstand gesteuert oder geregelt. Die Drehzahl der Speisewalze wird insbesondere proportional zu einer Abweichung zwischen einem Sollwert des ersten Mahlgut-Füllstandes und dem Istwert des ersten Mahlgut-Füllstandes angepasst.A speed of rotation of the feed roller is preferably controlled or regulated as a function of the first grist fill level. The speed of the feed roller is adjusted in particular proportionally to a deviation between a setpoint of the first millbase fill level and the actual value of the first millbase fill level.

Bevorzugt wird eine Drehzahl der Förderwelle abhängig vom zweiten Mahlgut-Füllstand gesteuert oder geregelt. Die Drehzahl der Förderwelle wird insbesondere umgekehrt proportional zu einer Abweichung zwischen einem Sollwert des zweiten Mahlgut-Füllstandes und dem Istwert des zweiten Mahlgut-Füllstandes angepasst.A speed of the conveyor shaft is preferably controlled or regulated as a function of the second mill level. The speed of the conveyor shaft is in particular adjusted in inverse proportion to a deviation between a setpoint of the second millbase fill level and the actual value of the second millbase fill level.

Bevorzugt wird, falls die Verteil-Dosiervorrichtung mit einem als Spalt zwischen der Speisewalze und einer Drosselvorrichtung ausgebildeten Mahlgutauslass ausgebildet ist, eine Spaltweite des Spaltes abhängig vom ersten Mahlgut-Füllstand gesteuert oder geregelt. Die Drehzahl der Speisewalze wird dabei insbesondere konstant gehalten (d.h. nicht im Betrieb geändert). Dabei wird die Spaltweite insbesondere proportional zu einer Abweichung zwischen einem Sollwert des ersten Mahlgut-Füllstandes und dem Istwert des ersten Mahlgut-Füllstandes angepasst.If the distribution metering device is designed with a regrind outlet designed as a gap between the feed roller and a throttle device, a gap width of the gap is controlled or regulated depending on the first regrind fill level. The speed of the feed roller is in particular kept constant (i.e. not changed during operation). In this case, the gap width is adapted in particular proportionally to a deviation between a setpoint of the first millbase fill level and the actual value of the first millbase fill level.

Es wird ferner ein Walzenstuhl offenbart, umfassend wenigstens zwei in einem Gehäuse angeordneten Walzen, einen Mahlguteinlass, einen Mahlgutauslass und eine Kontrolleinheit zum Steuern und/oder Regeln des Walzenstuhls. Die Kontrolleinheit ist dabei in einem Schaltschrank mit einer Kühlung angeordnet, wobei der Schaltschrank am Walzenstuhl, insbesondere am Gehäuse, angeordnet ist. Die Kühlung umfasst wenigstens ein Peltier-Element.A roller mill is also disclosed, comprising at least two rollers arranged in a housing, a regrind inlet, a regrind outlet and a control unit for controlling and / or regulating the roller mill. The control unit is arranged in a control cabinet with cooling, the control cabinet on the roller mill, in particular on the housing, is arranged. The cooling comprises at least one Peltier element.

Aufgrund der Umgebungseigenschaften eines Walzenstuhls muss die Kontrolleinheit zum einen vor äusseren Einflüssen (Staub) geschützt werden, zum anderen muss sie aus Sicherheitsgründen (Staubexplosionsgefahr) als mögliche Zündquelle sicher und von der Umwelt abgetrennt aufgenommen werden. Bisherige Lösungen schlugen einen zentralen Schaltschrank vor, aus welchem die gesamte Anlage (mehrere Walzenstühle) gespeist und gesteuert/geregelt wird. Der Installationsaufwand ist dabei sehr gross, da viele Leitungen vom Schaltschrank bis zur jeweiligen Maschine verlegt werden müssen. Mit einem direkt an der Verteil-Dosiervorrichtung angeordneten Schaltschrank entfällt dieser Installationsaufwand. Es müssen insbesondere lediglich 3 Leitungen mit der Kontrolleinheit verbunden werden (Stromzufuhr; Datenübertragung, z.B. BUS; Sicherheitsabschaltung). Somit kann die Vorrichtung bereits ab Werk installiert und konfiguriert und muss am Ort der Montage lediglich nach dem "Plug-and-Play-Konzept" mit der jeweiligen Leitung verbunden werden. Um die beim Betrieb entstehende Wärme abzuführen umfasst der Schaltschrank wenigstens ein Peltier-Element zum Kühlen des Innenraumes des Schaltschrankes.Due to the environmental properties of a roller mill, the control unit must be protected against external influences (dust), on the one hand, and, for safety reasons (risk of dust explosion), it must be safely taken up as a possible ignition source and separated from the environment. Previous solutions proposed a central control cabinet from which the entire system (several roller mills) was fed and controlled. The installation effort is very high, since many cables have to be laid from the control cabinet to the respective machine. This installation effort is eliminated with a control cabinet located directly on the distribution and dosing device. In particular, only 3 lines need to be connected to the control unit (power supply; data transmission, e.g. BUS; safety shutdown). Thus, the device can already be installed and configured at the factory and only has to be connected to the respective line at the place of assembly according to the "plug and play concept". In order to dissipate the heat generated during operation, the control cabinet comprises at least one Peltier element for cooling the interior of the control cabinet.

Vorteilhaft ist hierbei die Isolierung zwischen Aussen- und Innenraum, so dass mögliche Zündquellen nicht mit der Walzenstuhlumgebung in Verbindung stehen.The insulation between the outside and the inside is advantageous here, so that possible ignition sources are not connected to the roller mill environment.

Die Erfindung wird nachfolgend anhand eines bevorzugten Ausführungsbeispiels in Verbindung mit den Figuren besser beschrieben. Es zeigen:

Fig. 1
eine schematische Schnittansicht der erfindungsgemässen Verteil-Dosiervorrichtung in einer Ebene parallel zur Speisewalzenwelle;
Fig. 2
eine schematische Schnittansicht der erfindungsgemässen Verteil-Dosiervorrichtung in einer Ebene senkrecht zur Speisewalzenwelle; und
Fig. 2
eine schematische perspektivische Ansicht des erfindungsgemässen Walzenstuhls mit einer Verteil-Dosiervorrichtung und einem Schaltschrank.
The invention is described in more detail below on the basis of a preferred exemplary embodiment in conjunction with the figures. Show it:
Fig. 1
a schematic sectional view of the distribution-metering device according to the invention in a plane parallel to the feed roller shaft;
Fig. 2
a schematic sectional view of the distribution-metering device according to the invention in a plane perpendicular to the feed roller shaft; and
Fig. 2
is a schematic perspective view of the roller mill according to the invention with a distribution metering device and a control cabinet.

In den Figuren 1 und 2 ist schematisch eine Verteil-Dosiervorrichtung 1 dargestellt. Die Verteil-Dosiervorrichtung 1 umfasst ein Gehäuse 2 mit einem Mahlguteinlass 3 und einem Mahlgutauslass 4. Im Gehäuse 2 sind eine um eine Speisewalzenachse SA drehbare Speisewalze 5 sowie oberhalb der Speisewalze 5 in Mahlgutfliessrichtung eine Förderwelle 6 angeordnet. Die Förderwelle ist in diesem Fall als Förderschnecke ausgebildet und ist um die Förderwellenachse FA, welche parallel zur Speisewalzenachse SA ist, drehbar. Zum Antreiben der Speisewalze 5 bzw. der Förderwelle 6 sind jeweils Motoren 15 und 16 vorhanden. Die Motoren 15 und 16 stehen mit einer Kontrolleinheit 12 in Wirkverbindung (schematisch durch die gestrichelte Linie dargestellt) .In the Figures 1 and 2 a distribution-metering device 1 is shown schematically. The distribution and metering device 1 comprises a housing 2 with a regrind inlet 3 and a regrind outlet 4. In the housing 2 there is a feed roller 5 rotatable about a feed roller axis SA and above the feed roller 5 in the regrind flow direction. In this case, the conveyor shaft is designed as a screw conveyor and can be rotated about the conveyor shaft axis FA, which is parallel to the feed roller axis SA. Motors 15 and 16 are provided for driving the feed roller 5 and the conveyor shaft 6, respectively. The motors 15 and 16 are operatively connected to a control unit 12 (shown schematically by the dashed line).

Im Gehäuse 2 sind zwei Füllstandsensoren 7 und 8 angeordnet, welche zur Ermittlung des Mahlgut-Füllstandes im Gehäuse ausgebildet sind und ebenfalls mit der Kontrolleinheit 12 in Wirkverbindung stehen.In the housing 2, two level sensors 7 and 8 are arranged, which are designed to determine the ground level in the housing and are also in operative connection with the control unit 12.

Der erste Füllstandsensor 7 ist im Bereich des Mahlguteinlasses 3 bei einem ersten Ende der Speisewalze 5 und der Förderwelle 6 angeordnet. Der zweite Füllstandsensor 8 ist bei dem anderen Ende der Speisewalze 5 und der Förderwelle 6 angeordnet. Es sind somit zwei Füllstandsensoren 7 und 8 bei den beiden Enden der Speisewalze 5 und der Förderwelle 6 angeordnet. Der Mahlguteinlass 3 befindet sich ebenfalls nicht wie bei bekannten Vorrichtungen mittig sondern ist oberhalb des ersten Endes der Speisewalze 5 und der Förderwelle 6 angeordnet.The first fill level sensor 7 is in the area of the regrind inlet 3 at a first end of the feed roller 5 and the conveyor shaft 6 arranged. The second fill level sensor 8 is arranged at the other end of the feed roller 5 and the conveyor shaft 6. Two level sensors 7 and 8 are thus arranged at the two ends of the feed roller 5 and the conveyor shaft 6. The regrind inlet 3 is likewise not in the center, as in known devices, but is arranged above the first end of the feed roller 5 and the conveyor shaft 6.

Aus der Figur 2 ist ferner der Aufbau einer Drosselvorrichtung 10 sichtbar, welche zur Einstellung eines Spaltes 9, der als Mahlgutauslass 4 des Gehäuses 2 dient, Anwendung findet. Die Drosselvorrichtung 10 umfasst nebst Aktuatoren und Lagern ein längliches Profil 11 mit einem kreisabschnittförmigen Querschnitt. Durch Drehung des Profils 11 (durch die gestrichelte Position schematisch dargestellt) kann die Spaltweite des Spaltes 9 eingestellt werden.From the Figure 2 the structure of a throttle device 10 is also visible, which is used to set a gap 9, which serves as regrind outlet 4 of the housing 2. In addition to actuators and bearings, the throttle device 10 comprises an elongated profile 11 with a cross-section in the form of a circular section. The gap width of the gap 9 can be set by rotating the profile 11 (represented schematically by the dashed position).

Aus der Figur 2 ist ferner die Anordnung der Leitanordnung 18 sichtbar, welche als Rutsche ausgebildet ist. Die Leitanordnung endet mit einer Kante 19 nah an der Oberfläche der Speisewalze 5. Die Kante 19 ist so angeordnet, dass kein Mahlgut unter die Speisewalze 5 gelangen kann bzw. kein Mahlgut im Speiseraum verbleiben kann; z.B. kann die Kante 19 zu diesem Zweck bezüglich eines Lots durch die Speisewalzenachse SA mit einem Winkelabstand von 0° bis 90° angeordnet. Durch diese Anordnung wird ein Totraum um die Speisewalze reduziert und die Restentleerung/Reinigung der Verteil-Dosiervorrichtung 1 erleichtert. Eine Ummantelung 20 schliesst sich der Kante 19 zur Abdichtung an. Im Stand der Technik umschliesst der Speiseraum die Speisewalze (Austragswalze) grösstenteils, wodurch sich eine Totzone unterhalb der Speisewalze (Austragswalze) bildet, welche im Betrieb nicht vollständig entleert werden kann und somit manuell im Stillstand gereinigt werden müsste. Diese Totzone kann ein ungewollter Aufenthaltsort für Insekten usw. sein. Bei der Anordnung der Kante 19 sollte daher idealerweise Sorge getragen werden dafür, dass sich keine solche Totzone bilden kann. UFrom the Figure 2 the arrangement of the guide arrangement 18, which is designed as a slide, is also visible. The guide arrangement ends with an edge 19 close to the surface of the feed roller 5. The edge 19 is arranged such that no regrind can get under the feed roller 5 or no regrind can remain in the dining area; For example, for this purpose the edge 19 can be arranged at an angular distance of 0 ° to 90 ° with respect to a solder through the feed roller axis SA. With this arrangement, a dead space around the feed roller is reduced and the residual emptying / cleaning of the distribution metering device 1 is facilitated. A casing 20 joins the edge 19 for sealing. In the prior art, the dining area for the most part surrounds the feed roller (discharge roller), as a result of which a dead zone forms below the feed roller (discharge roller), which cannot be completely emptied during operation and would therefore have to be cleaned manually at a standstill. This dead zone can be an unwanted one Location for insects, etc. When arranging the edge 19, care should therefore ideally be taken to ensure that no such dead zone can form. U

Beim Betreiben der Verteil-Dosiervorrichtung 1 wird Mahlgut durch den Mahlguteinlass 3 zugeführt. Durch Drehung der Förderwelle 6 wird das Mahlgut vom ersten Ende in Richtung des zweiten Endes der Speisewalze 6 gefördert. Diese Verteilung wird durch den zweiten Füllstandsensor 8 überwacht. Wenn der vom zweiten Füllstandsensor 8 gemessene, zweite Mahlgut-Füllstand (Istwert) von einem Sollwert des zweiten Mahlgut-Füllstandes abweicht, wird entsprechend die Drehzahl der Förderwelle 6 angepasst, so dass mehr oder weniger Mahlgut zum anderen Ende der Speisewalze 5 gefördert wird.When operating the distribution metering device 1, regrind is fed through the regrind inlet 3. By rotating the conveyor shaft 6, the ground material is conveyed from the first end in the direction of the second end of the feed roller 6. This distribution is monitored by the second fill level sensor 8. If the second regrind fill level (actual value) measured by the second fill level sensor 8 deviates from a target value of the second regrind fill level, the speed of the feed shaft 6 is adjusted accordingly, so that more or less regrind is conveyed to the other end of the feed roller 5.

Gleichzeitig wird die Speisewalze 5 angetrieben. Wenn der vom ersten Füllstandsensor 7 gemessene, erste Mahlgut-Füllstand (Istwert) von einem Sollwert des ersten Mahlgut-Füllstandes abweicht, wird die Drehzahl der Speisewalze 5 entsprechend angepasst, so dass mehr oder weniger Mahlgut ausgetragen wird, damit die Füllhöhe des Gehäuses konstant bleibt
In der Figur 3 ist ein Walzenstuhl 14 mit einer Verteil-Dosiervorrichtung 1 sichtbar. Hervorzuheben ist der Schaltschrank 13, welcher am Walzenstuhl angeordnet ist und welcher die Kontrolleinheit 12 beherbergt und durch Peltier-Elemente 17 gekühlt wird (von denen lediglich Kühlrippen sichtbar sind). Andere ATEX-konforme Kühlungen sind ebenfalls denkbar, zum Beispiel Flüssigkeits-, insbesondere Wasserkühlungen; ATEX-konforme Ventilatoren; etc.At the same time, the feed roller 5 is driven. If the first regrind fill level (actual value) measured by the first fill level sensor 7 deviates from a target value of the first regrind fill level, the speed of the feed roller 5 is adjusted accordingly, so that more or less regrind is discharged so that the fill level of the housing remains constant
In the Figure 3 a roller mill 14 with a distribution metering device 1 is visible. Of particular note is the control cabinet 13, which is arranged on the roller mill and which houses the control unit 12 and is cooled by Peltier elements 17 (of which only cooling fins are visible). Other ATEX-compliant cooling systems are also conceivable, for example liquid cooling systems, in particular water cooling systems; ATEX-compliant fans; Etc.

Claims (14)

  1. Distributing and metering device (1) for a roller mill, comprising:
    - a housing (2) having at least one milling-material inlet (3) and at least one milling-material outlet (4),
    - a feeding roller (5), which is arranged in the housing (2), for metering milling material into a milling gap of the roller mill through the milling-material outlet (4), which roller is rotatable about a feeding roller axis (SA),
    - a conveying shaft (6), which is arranged in the housing (2), for distributing milling material along the feeding roller (5), which shaft is rotatable about a conveying shaft axis (FA), wherein the conveying shaft axis (FA) is arranged substantially parallel to the feeding roller axis (SA), and
    - a first filling level sensor (7), which is arranged in the housing (2), for determining a first milling-material filling level of the housing (2),
    characterized in that
    the distributing and metering device (1) further comprises
    - a second filling level sensor (8), which is arranged in the housing, for determining a second milling-material filling level of the housing (2), wherein
    - the milling-material inlet (3) and the first filling level sensor (7) are arranged at a first end, that is to say at a first third, of the feeding roller (5) and of the conveying shaft (6), and
    - the second filling level sensor (8) is arranged at a second end, that is to say at a last third, of the feeding roller (5) and of the conveying shaft (6).
  2. Distributing and metering device (1) according to Claim 1, characterized in that a rotational speed of the feeding roller (5) can be controlled or regulated independently of the conveying shaft (6) and in dependence on the first and/or second milling-material filling level, in particular in dependence on the first milling-material filling level.
  3. Distributing and metering device (1) according to Claim 1 or 2, characterized in that a rotational speed of the conveying shaft (6) can be controlled or regulated independently of the feeding roller (5) and in dependence on the first and/or second milling-material filling level, in particular in dependence on the second milling-material filling level.
  4. Distributing and metering device (1) according to one of the preceding claims, characterized in that the milling-material outlet (4) is designed as a gap (9) between the feeding roller (5) and a throttle device (10).
  5. Distributing and metering device (1) according to Claim 4, characterized in that the throttle device (10) comprises a rotatable profile (11) with a circular segment-shaped cross section.
  6. Distributing and metering device (1) according to either of Claims 4 and 5, characterized in that a gap width of the gap (9) can be controlled or regulated independently of the feeding roller (5) and/or of the conveying shaft (6) and in dependence on the first and/or second milling-material filling level, in particular in dependence on the first milling-material filling level.
  7. Distributing and metering device (1) according to one of the preceding claims, wherein the distributing and metering device (1) further comprises a guiding arrangement (18) for guiding milling material to the feeding roller (5), characterized in that the guiding arrangement ends with an edge (19) which is arranged in such a way that no dead zone can be formed below the feeding roller (5) that cannot be completely emptied during operation, by the edge being arranged at a distance from the feeding roller of between 0.001 and 5 mm and, in radial section through the feeding roller (5), the edge (19) being arranged with preferably an angular distance between 0° and 90° with respect to a perpendicular through the feeding roller axis (SA).
  8. Roller mill (14) having at least two rollers which define a roller gap, characterized in that the roller mill further comprises a distributing and metering device (1) according to one of the preceding claims.
  9. Method for the milling of milling material in a roller mill, comprising the step of feeding the milling material to the roller mill via a distributing and metering device (1) according to one of Claims 1 to 6.
  10. Method according to Claim 9, characterized in that a rotational speed of the feeding roller (5) is controlled or regulated in dependence on the first milling-material filling level.
  11. Method according to Claim 10, characterized in that the rotational speed of the feeding roller (5) is adapted to be proportional to a deviation between a desired value of the first milling-material filling level and the actual value of the first milling-material filling level.
  12. Method according to one of Claims 9 to 11, characterized in that a rotational speed of the conveying shaft (6) is controlled or regulated in dependence on the second milling-material filling level.
  13. Method according to Claim 12, characterized in that the rotational speed of the conveying shaft (6) is adapted to be inversely proportional to a deviation between a desired value of the second milling-material filling level and the actual value of the second milling-material filling level.
  14. Method according to one of Claims 9 to 13, carried out by a device according to Claim 6, characterized in that a gap width of the gap (9) is controlled or regulated in dependence on the first milling-material filling level.
EP18174239.6A 2018-05-25 2018-05-25 Distributing and metering device for a roller mill, roller mill with such a distributing and metering device and method for grinding material Active EP3572152B1 (en)

Priority Applications (29)

Application Number Priority Date Filing Date Title
EP18174239.6A EP3572152B1 (en) 2018-05-25 2018-05-25 Distributing and metering device for a roller mill, roller mill with such a distributing and metering device and method for grinding material
ES18174239T ES2824761T3 (en) 2018-05-25 2018-05-25 Distribution-dosing device for a roll mill, roll mill with such a distribution-dosing device and process for grinding material to be ground
PCT/EP2019/059131 WO2019223930A1 (en) 2018-05-25 2019-04-10 Cereal mill and roll stand having multiple milling passages for optimized milling of milling material and corresponding method
BR112020023940-2A BR112020023940A2 (en) 2018-05-25 2019-04-10 cereal mill and roller holder with multiple milling passages for optimum grinding of grinding material, and associated method
EP19716172.2A EP3801909B1 (en) 2018-05-25 2019-04-10 Cereal milling device and roller mill with a plurality of milling passages for optimised milling of material, and corresponding method
JP2020565791A JP2021524804A (en) 2018-05-25 2019-04-10 Cereal mill and roller stand with several milling passages for optimized milling of milling raw materials and corresponding processes
RU2020142761A RU2757420C1 (en) 2018-05-25 2019-04-10 Grain mill and a rolling machine with several grinding passes for optimized grinding of material being ground, as well as appropriate method
KR1020207036706A KR102430868B1 (en) 2018-05-25 2019-04-10 Grain mills and roll stands with several milling passages and corresponding processes for optimized milling of milling materials
CN201980035241.0A CN112236233B (en) 2018-05-25 2019-04-10 Cereal grinding mill and roller mill with a plurality of grinding channels for optimized grinding of the ground material and corresponding method
DK19716172.2T DK3801909T3 (en) 2018-05-25 2019-04-10 GRAIN MILL AND ROLLING CHAIR WITH SEVERAL PAINTING PASSAGES FOR OPTIMIZED PAINTING OF PRODUCTS AND CORRESPONDING PROCEDURE
US17/058,667 US11618033B2 (en) 2018-05-25 2019-04-10 Cereal mill and roll stand with several milling passages for optimised milling of milling material and corresponding process
US17/058,412 US11185867B2 (en) 2018-05-25 2019-05-27 Distribution metering device for a roller mill, roller mill with such a distribution metering device, method for grinding grinding stock, and roller mill comprising a switching cabinet with a cooling system
RU2020142810A RU2755504C1 (en) 2018-05-25 2019-05-27 Distribution and dosing device for roll mill, roll mill with such distribution and dosing device, method for grinding crushed mass and roll mill containing
PCT/EP2019/063644 WO2019224399A1 (en) 2018-05-25 2019-05-27 Distribution metering device for a roller mill, roller mill with such a distribution metering device, method for grinding grinding stock, and roller mill comprising a switching cabinet with a cooling system
CA3101404A CA3101404C (en) 2018-05-25 2019-05-27 Distribution metering device for a roller mill, roller mill with such a distribution metering device, method for grinding stock, and roller mill comprising a switching cabinet with a cooling system
JP2020565876A JP6953642B2 (en) 2018-05-25 2019-05-27 Roller mills with distributed metering and feeding equipment for roller mills, roller mills with such distributed weighing and feeding equipment, methods for crushing milled raw materials, and switchboard cabinets with cooling systems.
CN202210198533.XA CN114534852B (en) 2018-05-25 2019-05-27 Distribution metering device for roller mill, roller mill and grinding method
MX2020012603A MX2020012603A (en) 2018-05-25 2019-05-27 Distribution metering device for a roller mill, roller mill with such a distribution metering device, method for grinding grinding stock, and roller mill comprising a switching cabinet with a cooling system.
KR1020207037065A KR102320757B1 (en) 2018-05-25 2019-05-27 A roller mill comprising a dispensing and metering device for a roller mill, a roller mill having such dispensing and metering device, a grinding method for pulverizing a pulverized material, and a switching cabinet having a cooling system
CN201980046037.9A CN112384301B (en) 2018-05-25 2019-05-27 Distribution metering device for roller mill, roller mill and grinding method
KR1020217034574A KR102647490B1 (en) 2018-05-25 2019-05-27 Distribution metering device for a roller mill, roller mill with such a distribution metering device, method for grinding grinding stock, and roller mill comprising a switching cabinet with a cooling system
EP19725761.1A EP3592464A1 (en) 2018-05-25 2019-05-27 Distribution metering device for a roller mill, roller mill with such a distribution metering device, method for grinding grinding stock, and roller mill comprising a switching cabinet with a cooling system
AU2019272929A AU2019272929B2 (en) 2018-05-25 2019-05-27 Distribution metering device for a roller mill, roller mill with such a distribution metering device, method for grinding grinding stock, and roller mill comprising a switching cabinet with a cooling system
BR112020023672-1A BR112020023672B1 (en) 2018-05-25 2019-05-27 DISTRIBUTION AND MEASUREMENT DEVICE FOR A CYLINDER MILL, CYLINDER MILL AND METHOD FOR MILLING MILLING MATERIAL
MX2021012001A MX2021012001A (en) 2018-05-25 2020-11-23 Distribution metering device for a roller mill, roller mill with such a distribution metering device, method for grinding grinding stock, and roller mill comprising a switching cabinet with a cooling system.
JP2021159213A JP7326397B2 (en) 2018-05-25 2021-09-29 Distributive metering device for roller mill, roller mill with such a distributive metering device, method for comminuting grinding stock and roller mill with switchboard cabinet with cooling system
AU2021261834A AU2021261834B2 (en) 2018-05-25 2021-11-01 Distribution metering device for a roller mill, roller mill with such a distribution metering device, method for grinding grinding stock, and roller mill comprising a switching cabinet with a cooling system
US17/528,912 US11865547B2 (en) 2018-05-25 2021-11-17 Distribution metering device for a roller mill, roller mill with such a distribution metering device, method for grinding grinding stock, and roller mill comprising a switching cabinet with a cooling system
JP2023008641A JP2023052592A (en) 2018-05-25 2023-01-24 Serial mill and roller stand comprising several pulverization passage for process corresponding to optimized pulverization of floured/milled raw material

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EP18174239.6A EP3572152B1 (en) 2018-05-25 2018-05-25 Distributing and metering device for a roller mill, roller mill with such a distributing and metering device and method for grinding material

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EP3572152B1 true EP3572152B1 (en) 2020-08-05

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EP19725761.1A Pending EP3592464A1 (en) 2018-05-25 2019-05-27 Distribution metering device for a roller mill, roller mill with such a distribution metering device, method for grinding grinding stock, and roller mill comprising a switching cabinet with a cooling system

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US20220072561A1 (en) 2022-03-10
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EP3592464A1 (en) 2020-01-15
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CA3101404A1 (en) 2019-11-28
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EP3572152A1 (en) 2019-11-27
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