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WO2009043590A2 - Broyeur à cylindres et procédé de broyage de grains alimentaires - Google Patents

Broyeur à cylindres et procédé de broyage de grains alimentaires Download PDF

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Publication number
WO2009043590A2
WO2009043590A2 PCT/EP2008/008396 EP2008008396W WO2009043590A2 WO 2009043590 A2 WO2009043590 A2 WO 2009043590A2 EP 2008008396 W EP2008008396 W EP 2008008396W WO 2009043590 A2 WO2009043590 A2 WO 2009043590A2
Authority
WO
WIPO (PCT)
Prior art keywords
grinding
grains
alimentary
roller mill
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.)
Ceased
Application number
PCT/EP2008/008396
Other languages
English (en)
Other versions
WO2009043590A3 (fr
Inventor
Carlo Baiada
Mario Savini
Stefano Camatti
Alessandro Brambati
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.)
BRATOS Srl
Original Assignee
BRATOS Srl
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 BRATOS Srl filed Critical BRATOS Srl
Publication of WO2009043590A2 publication Critical patent/WO2009043590A2/fr
Publication of WO2009043590A3 publication Critical patent/WO2009043590A3/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

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
    • B02C4/02—Crushing or disintegrating by roller mills with two or more rollers
    • B02C4/06—Crushing or disintegrating by roller mills with two or more rollers specially adapted for milling grain
    • 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 present invention refers to a roller mill and to a process for grinding alimentary grains in general, roasted or not roasted (coffee, barley, cocoa, peanuts, etc.). It is known that in a roller mill for coffee the grinding of the bean is obtained by combined compression and cutting action on the bean itself.
  • the cutting action is due to the difference between the peripheral speeds of the two rollers: if the angular speed of the two rollers having equal diameters were the same, the cutting action would be zero.
  • a known mill is generally made up of a feeding section, a grinding section and a mixing section of the powders formed from the milling itself, the homogeneity of the distribution of the granulometry being extremely important for the quality of the milled product.
  • the grinding section is in turn generally made up of three sub-sections: breaking, finishing and super- finishing, the third sub- section of which is sometimes absent.
  • Each roller is equipped with more or less deep ribbing, studied so as to optimise the grinding effect for which that stage is intended, but one stage different to the other: each type of ribbing is optimised according to the task that the stage must perform (breaking, finishing or super- finishing) i and the type of coffee (Arabica, moka, etc.) that the mill has to grind.
  • each grinding sub- section the counter-rotating rollers are coupled with each other through a gearing that drives the motion from the drive roller to the driven roller.
  • the drive roller is made to move by a transmission actuated by one or more motors.
  • a transmission actuated by one or more motors.
  • the speed ratio between the various sub- sections is set by the parameters of the transmission itself.
  • rollers are hollow and crossed on the inside by a current of cold water, just as the mixer of the mixing section is equipped with an outer lining defining a gap in which cooling water circulates.
  • the productivity of the mill (taken to be mass of coffee ground per unit time) is lower as the fineness of the ground grain increases, as the maximum temperature of the coffee has to be respected.
  • fineness of the ground grain we mean the size of the coffee particle downstream of the grinding section.
  • the flexibility of the mill taken to be its ability to operate on different types of coffee (moka, Arabica, Napoli, etc.), is limited by the type of rollers installed: the mill can operate just on coffee for which reason the ribbing of the mounted rollers have been optimised, all the whilst the ribbings are sufficiently deep, having not yet been reduced by wearing of the roller.
  • the adjustment of the mill in the prior art, is limited to the adjustment of the distance between the two rollers by means of a micrometric mechanism, and to some adjustments of the speed when the motor or the motors are controlled by inverters .
  • N the case of a single motor for the entire grinding section, it will be possible to vary the speed of the entire section, leaving the ratios between the speeds of each pair of rollers and between the speeds of the sub-sections unchanged. These ratios are fixed by the mechanical parameters of the transmission.
  • the technical task proposed of the present invention is, therefore, to make a roller mill and a process for grinding alimentary grains that allow the aforementioned technical drawbacks of the prior art to be eliminated.
  • a purpose of the invention is to make a roller mill and a process for grinding alimentary grains that allow an improved joint performance both in terms of productivity and in terms of quality of the ground product.
  • Another purpose of the invention is to make a roller mill for grinding alimentary grains that has high flexibility to be used with different types of grains.
  • the last but not least purpose of the invention is to make a roller mill for grinding alimentary grains that can optimise grinding efficiency whilst respecting the process parameters to have better productivity combined with better quality of the ground product .
  • the technical task, as well as these and other purposes, according to the present invention, are accomplished by making a roller mill for grinding alimentary grains, having at least one pair of counter-rotating grinding rollers each controlled by an independent motor.
  • each roller of each pair of counter-rotating grinding rollers of each grinding sub-section of the grinding section has a respective independent motor controlled by a respective actuation, for example an inverter or an equivalent solution like a brushless motor or a vector- actuated AC motor, or with any controlled electric motor with an actuation.
  • a respective actuation for example an inverter or an equivalent solution like a brushless motor or a vector- actuated AC motor, or with any controlled electric motor with an actuation.
  • the roller mill of the present invention can have an open- loop or preferably closed- loop adjustment system for controlling the rotation speed of each roller.
  • the closed- loop adjustment system can be of the type with or without speed sensors .
  • the roller mill of the present invention comprises means for detecting the temperature of the grains downstream of each grinding section or sub-section, and means for detecting the particle size of the grains downstream of each grinding section or sub-section for the adjustment of the process parameters .
  • roller mill of the present invention advantageously foresees a process supervisor for the management of the production recipes.
  • the process for grinding alimentary grains with a roller mill of the present invention consists of varying the cutting effect on the grain by independently controlling the rotation speed of each roller of each pair of counter-rotating grinding rollers to vary the rotation speed ratio of each pair of counter-rotating rollers.
  • the cutting effect on the grain is varied to increase the grinding efficiency and/or to simulate different ribbings of the rollers suitable for different types of grains, and/or to compensate for the variation in profile of the rollers due to wear that alters their ribbings .
  • figure 1 shows a functional bock diagram of the roller mill
  • FIG. 2 shows a functional diagram of the supervisor
  • FIG. 3 shows a functional diagram of each grinding subsection.
  • the mill comprises a feeding section 1, a grinding section 2 comprising, in sequence, a first breaking sub-section 3, a second finishing sub-section 4 and a third super finishing sub-section 5, and a mixing section 6.
  • the feeding section 1 comprises a group, formed from inverter
  • Ia - motor Ib - reducer Ic directly responsible for the rotation of the roller Id.
  • the breaking sub- section 3 comprise a first group formed from inverter 3a - motor 3b - reducer 3c, directly responsible for the rotation of the roller 3d, and a second group formed from inverter 3e - motor 3f - reducer 3g, directly responsible for the rotation of the roller 3h opposite the roller 3d.
  • the finishing sub-section 4 comprises a first group formed from inverter 4a - motor 4b - reducer 4c, directly responsible for the rotation of the roller 4d, and a second group formed from inverter 4e - motor 4f - reducer 4g, directly responsible for the rotation of the roller 4h opposite the roller 4d.
  • the super finishing sub- section 5 comprises a first group formed from inverter 5a - motor 5b - reducer 5c, directly responsible for the rotation of the roller 5d, and a second group formed from inverter 5e - motor 5f - reducer 5g, directly responsible for the rotation of the roller 5h opposite the roller 5d.
  • the mixing section 6 comprises a group formed from inverter 6a - motor 6b, directly responsible for the rotation of the roller 6d.
  • a temperature sensor represented with a rhombus
  • a temperature sensor represented with a rhombus
  • TO, Tl, T2, T3 and T4 respectively are the temperatures detected by the sensors of the feeding section, of the first grinding subsection, of the second grinding sub-section, of the third grinding sub- section and of the mixing section, respectively.
  • the temperature sensor can for example be a thermocouple or an optical pyrometer.
  • the logic unit of the adjustment system sends a set point value (indicated with IN3b for the motor 3b, IN3f for the motor 3f, IN4b for the motor 4b, IN4f for the motor 4f, IN5b for the motor 5b, IN5f for the motor 5f, IN6b for the motor 6b) to each motor at least of the grinding section 2 and in particular also of the motor of the mixing section 6.
  • the rotation speed of each roller is detected by means of a suitable sensor (not shown) and is adjusted in closed loop.
  • the output signal (indicated with OUT3b for the motor 3b, OUT3f for the motor 3f, OUT4b for the motor 4b, OUT4f for the motor 4f, OUT5b for the motor 5b, OUT5f for the motor 5f, OUT6b for the motor 6b) is returned to the logic unit.
  • the closing in feedback can also be obtained without a sensor but rather through vector control of the rotation that allows the value of the real speed to be obtained.
  • the motor 3i - reducer 31 group adjusts the distance between centres of the (parallel) rollers 3d and 3h and the position sensor/transducer 3m measures the distance between their centres; the motor 4i - reducer 41 group adjusts the distance between centres of the (parallel) rollers 4d and 4h and the position sensor/transducer 4m measures the distance between their centres remotely; and the motor 5i - reducer 51 group adjusts the distance between centres of the (parallel) rollers 5d and 5h and the position sensor/transducer 5m measures the distance between their centres .
  • the motor of each system for adjusting the distance between the rollers uses the corresponding position sensor/transducer that controls their position for position feedback.
  • Figures 2 and 3 show the outline diagram of the temperature control algorithm.
  • the setpoints of the individual subsections of the grinding section 2 are determined (Tlsetp for sub-section 3, T2setp for sub-section 4D T3setp for subsection 5) calculating them based upon a parameter (indicated with "E” in figure 2) that takes into account the exit temperature of the ground coffee (T4) and a maximum freely settable value (Tmax) , and based upon a "vertical" temperature profile (Tlprof, T2prof, T3prof) that will be followed by the coffee in passing from the first to the last grinding sub- section.
  • a parameter indicated with "E” in figure 2
  • Tmax maximum freely settable value
  • control passes to the PID (proportional-integral-derivative) algorithms that control slip (difference in angular speed between the opposite rollers of the same diameter of each grinding sub- section) and squashing (distance between centres of the rollers of the same diameter of each grinding subsection) with different weights (represented by the rhombus with the symbol %) that can be freely set by the user.
  • PID proportional-integral-derivative
  • Ti indicates the real temperature detected downstream of the grinding sub-section
  • Ei indicates the shift between Tisetp and Ti
  • Si indicates the slip in the sub-section i
  • Pi indicates the squashing in the subsection i .
  • the speed value of the fast roller is fixed based upon the desired hourly production value.
  • the desired speed value shall be obtained by acting directly on the inverter that controls the motor that actuates the fast roller.
  • the PID that controls squashing, in output gives the value of the distance between centres of the rollers.
  • each grinding sub- section By taking a small amount of powder with a suitable duct downstream of each sub- section it is also possible to perform direct particle size detections, optimizing the work recipes experimentally, based upon the particle size spectrum detected by the particle size analyzer.
  • the particle sizes downstream of each grinding sub- section can be detected by means of a particle size analyzer (three particle size analyzers, one for each grinding sub- section, or a single particle size analyzer that reads the three values in sequence .

Landscapes

  • Engineering & Computer Science (AREA)
  • Food Science & Technology (AREA)
  • Crushing And Grinding (AREA)
  • Beans For Foods Or Fodder (AREA)
  • Disintegrating Or Milling (AREA)

Abstract

L'invention porte sur un broyeur à cylindre pour le broyage de grains alimentaires, qui a au moins une paire de cylindres de broyage contrarotatifs, chacun commandé par un moteur indépendant.
PCT/EP2008/008396 2007-10-05 2008-10-03 Broyeur à cylindres et procédé de broyage de grains alimentaires Ceased WO2009043590A2 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ITMI2007A001920 2007-10-05
ITMI20071920 ITMI20071920A1 (it) 2007-10-05 2007-10-05 Mulino a rulli e procedimenti pe rla macinazione di grani alimentari

Publications (2)

Publication Number Publication Date
WO2009043590A2 true WO2009043590A2 (fr) 2009-04-09
WO2009043590A3 WO2009043590A3 (fr) 2009-08-06

Family

ID=40227996

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2008/008396 Ceased WO2009043590A2 (fr) 2007-10-05 2008-10-03 Broyeur à cylindres et procédé de broyage de grains alimentaires

Country Status (2)

Country Link
IT (1) ITMI20071920A1 (fr)
WO (1) WO2009043590A2 (fr)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2412246A1 (fr) * 2010-07-28 2012-02-01 Bühler AG Broyage de grains de café
EP2420320A1 (fr) * 2010-08-16 2012-02-22 Bauermeister Zerkleinerungstechnik GmbH Broyeur à cylindres pour café
CN109182888A (zh) * 2018-07-10 2019-01-11 吉林大学 耐高温冲蚀磨损的耦合仿生零部件及其仿生表面制备方法
WO2020141496A1 (fr) 2019-01-05 2020-07-09 Powell Malcolm Strathmore Appareil, système et procédé de comminution
IT202000016408A1 (it) * 2020-07-07 2022-01-07 Ocrim Soc Per Lindustria Meccanica S P A Pacco rulli per un mulino per macinare granaglie o altri prodotti granulari o comunque incoerenti, mulino provvisto di tale pacco rulli e procedimento per macinare.
US11318474B2 (en) * 2018-05-14 2022-05-03 Pearson Incorporated Milling system and method
EP4591985A1 (fr) 2024-01-24 2025-07-30 Royal Duyvis Wiener B.V. Machine à meuler à rouleaux, en particulier broyeur à rouleaux pour broyer des masses pâteuses, telles que la pâte de chocolat

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE764930C (de) * 1942-09-15 1954-01-25 Siemens Schuckertwerke A G Walzenstuhl
US4655400A (en) * 1985-04-29 1987-04-07 General Foods Corporation Coffee grinding method
DE102005022378B4 (de) * 2005-05-13 2007-04-05 F.B. Lehmann Maschinenfabrik Gmbh Walzenreibmaschine
DE102005037387A1 (de) * 2005-08-08 2007-02-15 F.B. Lehmann Maschinenfabrik Gmbh Walzwerk
US20070170291A1 (en) * 2006-01-23 2007-07-26 Naganawa Mauro M Cracking mill for grains of soy, wheat, and others

Cited By (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2012013620A1 (fr) * 2010-07-28 2012-02-02 Bühler AG Mouture de grains de café
EP2597961A1 (fr) * 2010-07-28 2013-06-05 Bühler AG Mouture de grains de café
JP2013535323A (ja) * 2010-07-28 2013-09-12 ビューラー アクツィエンゲゼルシャフト コーヒー豆の粉砕
EP2412246A1 (fr) * 2010-07-28 2012-02-01 Bühler AG Broyage de grains de café
EP2420320A1 (fr) * 2010-08-16 2012-02-22 Bauermeister Zerkleinerungstechnik GmbH Broyeur à cylindres pour café
US8690087B2 (en) 2010-08-16 2014-04-08 Bauermeister Zerkleinerungstechnik Gmbh Roller mill for coffee
US11318474B2 (en) * 2018-05-14 2022-05-03 Pearson Incorporated Milling system and method
CN109182888A (zh) * 2018-07-10 2019-01-11 吉林大学 耐高温冲蚀磨损的耦合仿生零部件及其仿生表面制备方法
CN114007750A (zh) * 2019-01-05 2022-02-01 康瑞Ip私人有限公司 用于粉碎的设备、系统和方法
WO2020141496A1 (fr) 2019-01-05 2020-07-09 Powell Malcolm Strathmore Appareil, système et procédé de comminution
CN114007750B (zh) * 2019-01-05 2024-03-19 康瑞Ip私人有限公司 用于粉碎的设备、系统和方法
AU2020204874B2 (en) * 2019-01-05 2025-01-23 Comre IP Pty Ltd Apparatus, system and method for comminution
IT202000016408A1 (it) * 2020-07-07 2022-01-07 Ocrim Soc Per Lindustria Meccanica S P A Pacco rulli per un mulino per macinare granaglie o altri prodotti granulari o comunque incoerenti, mulino provvisto di tale pacco rulli e procedimento per macinare.
EP4591985A1 (fr) 2024-01-24 2025-07-30 Royal Duyvis Wiener B.V. Machine à meuler à rouleaux, en particulier broyeur à rouleaux pour broyer des masses pâteuses, telles que la pâte de chocolat
WO2025158033A1 (fr) 2024-01-24 2025-07-31 Royal Duyvis Wiener B.V. Machine de broyage à cylindres, en particulier broyeur à cylindres pour broyer des masses de type pâte, telles qu'une masse de chocolat

Also Published As

Publication number Publication date
WO2009043590A3 (fr) 2009-08-06
ITMI20071920A1 (it) 2009-04-06

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