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
  • B02C15/00—Disintegrating by milling members in the form of rollers or balls co-operating with rings or discs
• • 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

Definitions

• the invention relates to a method for comminuting regrind with a roller mill having a grinding table, at least one grinding roller and at least two drives for driving the roller mill, wherein a compensation control for the drives is performed.
• the grinding table is usually driven in roller mills, which drives the grinding rollers on the grinding bed.
• roller mills which drives the grinding rollers on the grinding bed.
• the invention is therefore based on the object, the compensation for the
• Roller mill used, which has a grinding table, at least one grinding roller and at least two drives for driving the roller mill.
• a power compensation control is performed, wherein the power of the drives are controlled in a predetermined ratio to each other by controlling the speed of at least one drive.
• At least two grinding rollers are driven via a respective drive.
• the grinding table is driven only via the at least two grinding rollers and the material to be ground. But it is also conceivable that the grinding plate is assigned its own drive.
• the control of the speed of the drives via frequency converter, which preferably operate with field-oriented control.
• the power compensation control additionally comprises a regulation of the rotational speed of the grinding table, wherein preferably a predetermined speed of the grinding table is maintained.
• the drawing shows a schematic representation of a roller mill with a power compensation control.
• roller mill 1 is shown schematically, the one
• Mahlteller 10 at least two grinding rollers 11, 12 and at least two drives 13, 14 for driving the two grinding rollers 11, 12 has.
• Each drive comprises a motor 13a, 14a and a transmission 13b, 14b.
• a plurality of grinding rollers in particular three, four or more grinding rollers can be provided.
• the grinding table 10 is freely rotatable about an axis of rotation 10a, so that it is set in rotation only via the driven grinding rollers 11, 12 and the grinding material 3 located between the grinding roller and the grinding table. It would also be conceivable that the grinding table is assigned its own drive.
• the gear ratio is ultimately determined by the distance of the point of force application between Mahlrollenachse and Mahltellerachse.
• the distance ri of the force application point of the grinding roller 11 to the rotation axis 10a is smaller than the distance r 2 of the friction point of the grinding roller 12 to the rotation axis 10a.
• a different gear ratio results in that at the same speed of the grinding rollers 11, 12 different torques are transmitted to the grinding table.
• one drive is braked or accelerated with respect to the other drive.
• the resulting strong power fluctuations of the drives result in an increased energy requirement.
• a power compensation control 2 is provided, wherein by controlling the speed of at least one drive the
• Power of the drives 13, 14 are regulated in a predetermined ratio to each other.
• 12 identical drives 13, 14 are provided for the two identically designed grinding rollers 11, so that the
• Power compensation control keeps the power of the two drives at the same level.
• the grinding table could be driven at a lower or higher power than the grinding rollers.
• the power balancing control 2 in the illustrated embodiment consists essentially of one of the drives 13, 14 associated frequency converter 20, 21, a power compensation regulator 22, a Mahltellerfacesensor 23 and a Mahltellertextiereregler 24th
• the frequency converter 20, 21 are provided in a conventional manner with a field-oriented control. You get from the drives 13, 14 the current motor current or the motor voltage. From this, the power consumption of each drive is determined and a moving sum mean value is formed, which is weighted by a factor (with the same power of the drives equal to 0.5) and represents the nominal value of the drive. At almost constant Resistance torque depends this value essentially only on the speed of the respective drive.
• a deviation between the drive actual and drive rated power is applied to the power balancing controller 22, which provides a power adjustment of the two
• Drives 13, 14 causes by the speed of one or both drives is adjusted so that the power of the two drives in the specified
• Ratio in this case at the same level. In this case, it is also taken into account that the grinding table 10 rotates at a predetermined setpoint speed n soll .
• MahltellerFEbitiereregler 24 communicates with the Mahltellerthsensor 23 in communication and receives continuously the actual value of the speed of the grinding table, with the
• Setpoint n is compared so ii, resulting in the control deviation. From this, the controller generates the set speed of the drives 13, 14 at a fixed assumed ratio.
• the frequency converters 20, 21 have an internal speed controller and a revolving motor model, whereby the drive speed of the drives and the engine torque can be tapped.
• the frequency converter must be able to read in and output control and status data at the latest every 5 ms, so that the function of the power compensation regulator is ensured.
• the system is a cascade control, the individual levels are dynamically decoupled from each other and thus can be considered individually.
• the advantage of the regulation described above is that with a power balancing control the power consumption of the Drives 13, 14 differ only slightly and even major changes in the system (translation jump) are very fast.
• Frequency converter provide all relevant data up to the grinding table speed.
• the control interventions can be performed almost without power, so that the overall efficiency is at the level of a regulated drive.

Landscapes

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

Priority Applications (6)

Applications Claiming Priority (2)

Publications (1)

Family

ID=39233095

Family Applications (1)

Country Status (7)

Cited By (2)

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Citations (3)

Family Cites Families (9)

• 2007
  • 2007-02-07 DE DE102007006092A patent/DE102007006092A1/de not_active Withdrawn
• 2008
  • 2008-02-04 JP JP2009548678A patent/JP5208970B2/ja not_active Expired - Fee Related
  • 2008-02-04 US US12/525,755 patent/US8128011B2/en not_active Expired - Fee Related
  • 2008-02-04 WO PCT/EP2008/051354 patent/WO2008095902A1/de not_active Ceased
  • 2008-02-04 EP EP08708657A patent/EP1973665B1/de not_active Not-in-force
  • 2008-02-04 CN CN2008800019848A patent/CN101594939B/zh active Active
  • 2008-02-04 DK DK08708657.5T patent/DK1973665T3/da active
  • 2008-02-04 DE DE502008000208T patent/DE502008000208D1/de active Active

Patent Citations (3)

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