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
  • B02C15/006—Ring or disc drive gear arrangement

Definitions

• the invention relates to a roller mill with a grinding table and at least one rolling on the grinding table grinding roller.
• Roller mills which are also known as roller mills or vertical mills, are used in particular for the comminution of mineral raw materials and fuels, for example in the cement industry or in power plants.
• the invention is therefore based on the object to provide a roller mill, the Mahltellerantriebssystem is characterized by a reduced susceptibility and a space-saving arrangement of Mahltellerantriebes as possible.
• the roller mill according to the invention consists essentially of at least one grinding roller and one grinding table, the grinding table having a downwardly open grinding table interior, at least one grinding roller drive system for driving the grinding roller and a grinding table drive system for driving the grinding table.
• the Mahltellerantriebssystem also has a gearless direct drive, which is arranged in the Mahltellerinnenraum.
• the lower susceptibility to interference of the roller mill according to the invention is achieved on the one hand, that the entire drive power is divided, in which on the one hand, the grinding rollers and on the other hand, the grinding plates are driven separately. Furthermore, can be dispensed with by a gearless direct drive on the otherwise common and error-prone transmission for Mahltellerantrieb.
• the individual drives can be dimensioned correspondingly smaller, so that in the first place an arrangement of gearless direct drive in Mahltellerinnenraum and thus an extremely space-saving arrangement is possible.
• a roller mill is also known, the grinding rollers are driven, each with an independent single drive.
• an auxiliary drive in the grinding table is integrated to start the roller mill, but only has a capacity of about 2-5% of the total installed capacity of the roller mill.
• Such an auxiliary drive is also not designed for continuous operation and requires a corresponding reduction, which is achieved here by a rolling on an internal gear pinion or by a friction wheel.
• the gearless direct drive of the grinding table drive system has at least 10% to 40%, preferably 15-30% of the total installed drive power of the roller mill.
• the gearless direct drive on a rotor which is mounted on the Mahltellerlagerung of the grinding table.
• it is rotatably connected to the grinding table, in particular rotatably flanged to the grinding table.
• the grinding table storage is expediently arranged on a base plate of the roller mill.
• the lower part of the grinding plate is preferably bell-shaped or cylindrical, wherein the gearless direct drive is arranged inside the bell-shaped or cylindrical, lower part of the grinding table.
• a transverse flux motor or a high-torque motor with an inner stator and an outer rotor come into consideration.
• the high-torque motor can advantageously have a rotor with permanent magnet.
• the gearless direct drive is connected to a control device for controlling the direct drive to a predetermined drive torque in combination.
• the direct drive can be regulated in particular to a predetermined proportion of the recorded total power of the roller mill.
• a control device for the Mahlrollenantriebssystem is provided, for example, as
• Power compensation control is designed and beyond also with the gearless direct drive is in communication and this regulates to a predetermined proportion of the recorded total power of the roller mill.
• the activation of the direct drive is expediently carried out via a frequency converter.
• a gearless direct drive is used, which can be connected directly to the mains.
• a speed-controlled DC motor can be used.
• the drawing shows a schematic, partially sectioned side view of a roller mill.
• the roller mill shown in the drawing consists essentially of at least one grinding roller 1, a grinding table 2, a Mahlrollenantriebssystem 3 for driving the grinding roller 1 and a Mahltellerantriebssystem for driving the Mahltellers 2, which has a gearless direct drive 4.
• a grinding path 2a is formed, wherein comminuted Good 5 is comminuted in the gap between the grinding path 2a and grinding roller 1.
• the grinding table 2 rotates about its central, vertical Axis 6, wherein the grinding rollers 1 on the grinding path 2 or on the intervening, to be comminuted Good 5, wherein the grinding roller 1 is pressed by a Anpresssystem 7 against the grinding table 2.
• the grinding table 2 has a Mahltellerinnenraum 2b, which is formed for example by the fact that the lower part of the grinding plate 2 is bell-shaped or cylindrical, so that the gearless direct drive 4 in Mahltellerinnenraum 2b, or in the interior of the bell-shaped or cylindrical, lower Part of the grinding plate 2 can be arranged.
• the grinding table 2 is supported on a base plate 9 via a grinding table bearing 8, suitable bearings 8a and 8b being provided.
• the gearless direct drive 4 has an outer rotor 4a and an inner stator 4b, wherein the rotor 4a is flanged on the grinding table 2 (see positions 10, 11).
• the direct drive 4 can be arranged extremely space-saving inside the grinding table 2. Due to the special connection of the rotor 4a and the stator 4b, the rotor 4a does not require its own storage but is supported by the already existing grinding table bearing 8. In this way, the space is optimally utilized by not necessarily required machine elements (rotor bearing) omitted or be used by existing machine elements (grinding table storage 8). This also includes the direct connection of the stator 4b to the base plate and the absence of couplings.
• the direct motor 4 can already be mounted in the workshop on the base plate 9, so that on the one hand a high accuracy and on the other hand a simple and fast final assembly can be done on the site.
• the gearless direct motor 4 can be formed for example by a Transversalmannmotor or a high-torque motor, wherein the rotor of the high-torque motor is provided with permanent magnets.
• the resulting low speed of the direct drive also has the advantage in asynchronous machines that speed fluctuations that are triggered by load fluctuations from the grinding process, are not fed back greatly (reflected) in the torsional vibration system.
• the absence of an additional transmission also has the further advantage that eliminates games in the transmission and thus the susceptibility of the drive is significantly reduced.
• Mahlrollenantriebssystems 3 and the direct drive 4 via a control device 12.
• the entire installed drive power of the roller mill is distributed to multiple drives.
• the direct drive is designed so that it has at least 10-40%, preferably 15-30% of the total installed drive power.
• the control device 12 is designed so that it controls the gearless direct drive 4 to its predetermined proportion of the recorded total power of the roller mill. In addition, it can also be regulated to a predetermined drive torque.
• the control of the direct drive 4 takes place for example via a frequency converter, not shown.
• the arrangement of the direct drive inside the grinding plate allows a very space-saving arrangement, the elimination of the transmission ensures a significantly reduced susceptibility to interference.
• special connection of the direct drive 4 additional space and cost is saved.

Landscapes

• Engineering & Computer Science (AREA)
• Food Science & Technology (AREA)
• Crushing And Grinding (AREA)
• Connection Of Motors, Electrical Generators, Mechanical Devices, And The Like (AREA)
• Massaging Devices (AREA)
• Reduction Rolling/Reduction Stand/Operation Of Reduction Machine (AREA)
• Apparatuses For Bulk Treatment Of Fruits And Vegetables And Apparatuses For Preparing Feeds (AREA)
• Crushing And Pulverization Processes (AREA)
• Processing And Handling Of Plastics And Other Materials For Molding In General (AREA)
• Saccharide Compounds (AREA)

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Citations (6)

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• 2009
  • 2009-03-09 DE DE102009012353A patent/DE102009012353C5/de not_active Expired - Fee Related
• 2010
  • 2010-03-04 RU RU2011119492/13A patent/RU2520639C2/ru not_active IP Right Cessation
  • 2010-03-04 JP JP2011553399A patent/JP5647156B2/ja not_active Expired - Fee Related
  • 2010-03-04 DK DK10709462.5T patent/DK2242583T4/da active
  • 2010-03-04 WO PCT/EP2010/052774 patent/WO2010102946A1/de not_active Ceased
  • 2010-03-04 AT AT10709462T patent/ATE510625T1/de active
  • 2010-03-04 US US13/124,195 patent/US8651405B2/en not_active Expired - Fee Related
  • 2010-03-04 CN CN201080003216.3A patent/CN102215973B/zh not_active Expired - Fee Related
  • 2010-03-04 EP EP10709462.5A patent/EP2242583B2/de active Active
  • 2010-03-04 MX MX2011005283A patent/MX2011005283A/es active IP Right Grant
  • 2010-03-04 BR BRPI1004938A patent/BRPI1004938A8/pt not_active Application Discontinuation

Patent Citations (6)

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