• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    Drive arrangement of a vertical roller mill, comprising a housing (10); a pressure plate (11) rotatably supported on the housing (10) about a vertical pressure plate rotation axis (12) and forming an output of the drive assembly; a transmission device (13) disposed below the pressure plate (11) in the housing (10) and in rotational drive communication with the pressure plate (11); and a plurality of electric motors (14) in rotational drive connection with the transmission device (13); wherein each electric motor (14) is designed as an asynchronously operating, slip-bearing squirrel-cage motor without speed control.
    公开号:CH709984A2
    申请号:CH00975/15
    申请日:2015-07-06
    公开日:2016-02-15
    发明作者:Peter Boiger；Ingo Sommer
    申请人:Renk Ag；
    IPC主号:
    专利说明:

    The invention relates to a drive arrangement of a vertical roller mill according to the preamble of claim 1 and method for operating such a drive arrangement.
    From DE 10 2011 079 555 A1 a drive arrangement for a vertical roller mill is known. Thus, the known from this prior art drive assembly for a vertical roller mill comprises a housing, a rotatably supported on the housing pressure plate which is rotatable about a vertical pressure plate axis and which forms an output of the drive assembly, a transmission device which is below the pressure plate in the Housing is arranged and which is in rotational drive connection with the pressure plate, and a plurality of electric motors, which are arranged below the transmission device to the housing.
    Such a drive arrangement of a vertical roller mill, which has a number N electric motors, on the drive side in the form of a so-called master-slave drive control system. For this purpose, each electric motor is associated with a frequency converter, via which the respective electric motor can be supplied with electrical current or electrical voltage, wherein an electric motor, which serves as a so-called master, is operated speed-controlled by means of a speed control, and wherein all other electric motors, as Slave are so regulated that they deliver a torque equal to the speed-controlled master electric motor. Such a master-slave drive configuration requires a high device technology and control engineering effort. This is a disadvantage.
    There is a need for a drive assembly of a vertical roller mill with a simpler structure.
    On this basis, the invention is based on the object to provide a novel drive arrangement for a vertical roller mill and method for operating the same.
    This object is achieved by a drive arrangement according to claim 1.
    According to the invention, each electric motor is designed as an asynchronously operating, slip-loaded squirrel-cage motor without speed control.
    With the present invention, it is proposed for the first time for the drive of vertical roller mills to build a drive arrangement of a vertical roller mill on drehzahleregelte, asynchronously operating, slip-prone squirrel-cage motors. The slip of the output side coupled squirrel cage motors is used to operate the same without speed control. The device engineering and control engineering effort can be significantly reduced with the inventive drive assembly.
    According to a first advantageous embodiment of the invention, each electric motor can be coupled via a respective individually operable switching device to a supply network, wherein the drive arrangement comprises a number N, N> 2 electric motors and a control device, wherein for starting the drive assembly, the control device initially a single Electric motor or two electric motors coupled simultaneously by closing the respective switching device to the supply network, and wherein the control device subsequently one after the other individually couples a further electric motor to the supply network by closing the respective switching device until all N electric motors are coupled to the supply network.
    This drive arrangement, which uses simple switching devices for coupling the electric motors to the supply network, is particularly simple in terms of device technology and is particularly preferred when no speed change has to occur during operation of the drive arrangement. In a variant of this embodiment, a motor is connected to the mains and accelerated by means of a frequency converter up to its full speed. After reaching the speed, the frequency converter is bypassed.
    According to a second advantageous embodiment of the invention, each electric motor via a respective frequency converter can be coupled to a supply network, wherein the drive arrangement comprises a number N, N> 2 electric motors and a control device, wherein for starting the drive assembly, the control device drives all frequency converter simultaneously, to couple the electric motors to the supply network, namely such that all frequency converter output an output signal of the same frequency but any phase.
    This drive assembly, the frequency converter for coupling the electric motors to the supply network uses, is particularly preferred if a speed change is desired during operation of the drive assembly. However, in this case, the electric motors are not speed-controlled, so that even with this inventive drive arrangement of the control engineering effort can be significantly reduced, that is, there is no feedback of a speed signal used for target / actual comparison.
    Methods for operating the drive assembly are defined in claims 6 and 7.
    Preferred embodiments of the invention will become apparent from the dependent claims and the description below. Embodiments of the invention will be described, without being limited thereto, with reference to the drawings. Showing:<Tb> FIG. 1 <SEP> a drive arrangement of a vertical roller mill.
    The present invention relates to a drive arrangement of a vertical roller mill. The inventive drive arrangement of a vertical roller mill comprises a housing 10. On the housing 10, a pressure plate 11 is supported, which is rotatable about a vertical plate rotation axis 12 and which forms an output of the drive assembly. Below the pressure plate 11, a transmission device 13 is positioned in the housing 10, which is in rotary drive connection with the pressure plate 11. Further, a plurality of electric motors 14 are arranged in the housing 10 below the transmission device 13, which are in rotational drive connection via the transmission device 13 with the pressure plate 11. In the exemplary embodiment shown, the drive arrangement comprises a number N = 8 electric motors 14. However, this number is purely exemplary in nature. There may also be less than N = 8 or more than N = 8 electric motors 14. However, the number of electric motors 14 is greater than two, so N> 2 applies. Preferably, N> 4, more preferably N> 6.
    In the inventive drive arrangement, the electric motors 14 are all designed as asynchronous, slip-loaded squirrel cage motors without speed control. According to the invention, therefore, no master-slave drive arrangement, as is customary in the prior art or in practice, used, but non-speed-controlled squirrel cage motors 14 are used. As a result, the control engineering effort can be reduced.
    In the embodiment shown in FIG. 2, each of the electric motors 14, so each of the non-speed-controlled, asynchronously operating, slip-squeezed squirrel-cage motors, via one individually operable switching device 15 to a supply network 16 can be coupled, wherein the switching means 15 of the embodiment of FIG 2 are designed as simple switches that can be opened and closed.
    These switching devices 15 are starting controlled by a control device 17, namely such that for starting the drive assembly, the control device 17 initially couples a single electric motor 14 or alternatively two electric motors 14 simultaneously by closing the respective switching device 15 to the supply network 16, wherein the Control device 17 subsequently successively coupled in each case a further electric motor 14 individually to the supply network 16 by closing the respective switching device 15, namely until all N electric motors 14 are coupled to the supply network 16.
    The arrangement of FIG. 2, in which the individual squirrel cage motors 14 controlled by the control device 17 by closing the switching devices 15 are successively coupled to the supply network 16, is particularly suitable when no load during operation of the drive assembly, for example under load Speed change is required.
    To start the drive assembly, at least N-2 electric motors 14 successively and thus individually coupled by appropriate control of the respective switching device 15 via the controller 17 to the supply network 16, so that the starting current is limited to the drive assembly. Since the drive assembly receives almost no working torque when starting, the drive assembly runs up to a slip conditionally adjusting speed high. Since all electric motors 14, namely an all squirrel cage motors 14, are in constant mechanical drive connection, all drive motors have slip-dependent over an approximately equal speed. Then, when all the squirrel-cage motors 14 are coupled to the supply network 16 after starting the drive arrangement, the drive arrangement can be loaded. The load is distributed as part of the magnetic manufacturing deviations of the Kurschlußläufermotoren 14 based on the slip of the same at the operating point of the vertical roller mill on the individual squirrel cage motors 14th
    A speed control in the sense of a master-slave drive arrangement is not required with the inventive drive arrangement. The working torque can be absorbed by all squirrel cage motors 14, which are in constant mechanical drive connection, at any time proportionally. An increase of the asynchronous slip by a higher working torque leads to an equal increase in the power provided by the same on all squirrel-cage motors 14.
    In contrast to the embodiment of FIG. 2, it is also possible, instead of a simple switching device 15 each squirrel cage motor 14 to assign an individual, not shown frequency converter. In this case, the control device 17 controls all the frequency converter at the same time to jointly connect the electric motors 14 designed as Kurschlußläufermotoren to the supply network 16, namely such that then all frequency output an output signal of the same frequency, but any phase position for driving the respective electric motor 14. In this case, therefore, all the electric motors 14 are coupled together to start the drive assembly by simultaneously driving the same associated frequency inverters to the supply network 16, the frequency output the same frequency output signals but different phase.
    The drive arrangement with such frequency converters, which also operate without speed control, is advantageous if the drive assembly is to change its speed during operation. In this case, the frequency converter can then be controlled by the control device 17 such that they output a control signal with a different frequency and in turn any phase position to each other, so as to cause the speed change to the drive assembly. For uncontrolled speed change, accordingly, the control device 17 outputs a frequency setpoint for all frequency converters 15, but feedback in the sense of control does not occur according to the invention.
    权利要求:
    Claims (8)
    [1]
    1. Drive arrangement of a vertical roller mill, witha housing (10);a pressure plate (11) rotatably supported on the housing (10) about a vertical pressure plate rotation axis (12) and forming an output of the drive assembly;a transmission device (13) which is disposed below the pressure plate (11) in the housing (10) and which is in rotary drive connection with the pressure plate (11);a plurality of electric motors (14) in rotational drive connection with the transmission device (13); characterized in thateach electric motor (14) is designed as an asynchronously operating, slip-loaded squirrel-cage motor without speed control.
    [2]
    2. Drive arrangement according to claim 1, characterized in that each electric motor (14) via a respective individually operable switching device (15) to a supply network (16) can be coupled.
    [3]
    3. Drive arrangement according to claim 2, characterized by a number N, N> 2 electric motors (14) and a control device (17), wherein for starting the drive assembly, the control device (17) initially a single electric motor (14) or two electric motors (14) at the same time by closing the respective switching device (15) to the supply network (16) coupled, and wherein the control device (17) successively in each case a further electric motor (14) individually to the supply network (16) by closing the respective switching device (15) couples until all N electric motors (14) are coupled to the supply network (16).
    [4]
    4. Drive arrangement according to claim 3, characterized in that instead of the switching device (15) in each case a frequency converter is arranged, which has a bridging after startup.
    [5]
    5. Drive arrangement according to claim 1, characterized in that each electric motor (14) via a respective operable frequency converter to a supply network (16) can be coupled.
    [6]
    6. Drive arrangement according to claim 5, characterized by a number N, N> 2 electric motors (14) and a control device (17), wherein for starting the drive assembly, the control device (17) controls all frequency converter simultaneously to the electric motors (14) to the To couple supply network (16), namely such that all frequency converter output an output signal of the same frequency but any phase.
    [7]
    7. A method for operating a drive assembly according to one of claims 1 to 3, characterized in that for starting the drive assembly, first a single electric motor or two electric motors is simultaneously coupled by closing a respective electric motor associated switching device to a supply network or, and that below successively in each case a further electric motor is individually coupled to the supply network by closing a respective electric motor associated switching device until all electric motors are coupled to the supply network.
    [8]
    8. A method for operating a drive assembly according to any one of claims 1, 5 to 6, characterized in that for starting the drive assembly, all electric motors are coupled together by simultaneous driving of the same frequency converter to the supply network, namely such that all frequency converter an output signal of the same Frequency, but any phase output.
    类似技术:
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    同族专利:
    公开号 | 公开日
    CN106179614B|2019-09-17|
    CN106179614A|2016-12-07|
    CH709984B1|2019-03-29|
    DE102014011846A1|2016-02-11|
    JP6625367B2|2019-12-25|
    JP2016036810A|2016-03-22|
    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
    DE4018146A1|1990-06-06|1991-12-12|Alber Karin|Electronically-regulated electric drive - has star-delta switching device in supply path of asynchronous motor|
    EP0761850A1|1995-09-05|1997-03-12|Maschinenfabrik Rieter Ag|Method for starting up and braking a carding machine and switching system for driving a carding machine|
    DE102006043179A1|2006-09-14|2008-03-27|Siemens Ag|Mill for grinding coarse, stone-like bulk material with axis-parallel drive|
    DE102006050205B4|2006-10-25|2013-03-21|Gebr. Pfeiffer Ag|Safety system for roller mill|
    DE102008036784C5|2008-08-07|2013-06-20|Thyssenkrupp Polysius Ag|Roller mill and method for comminution of regrind|
    DE102011079555B4|2011-07-21|2020-12-24|Renk Ag|Drive arrangement for a vertical roller mill|
    FR2979838B1|2011-09-09|2016-01-15|Cie Engrenages Et Reducteurs Messian Durand|VERTICAL MILL DRIVE WITH SEVERAL MAIN DRIVINGS|CA3031990C|2016-07-29|2020-07-28|Siemens Aktiengesellschaft|Method for actuating a motor for starting a mill|
    CN111617870B|2020-06-10|2022-01-11|临泉县清华地产中药材有限责任公司|Crushing device for traditional Chinese medicinal material processing and working method thereof|
    法律状态:
    2017-09-29| PCAR| Change of the address of the representative|Free format text: NEW ADDRESS: BELLERIVESTRASSE 203 POSTFACH, 8034 ZUERICH (CH) |
    优先权:
    申请号 | 申请日 | 专利标题
    DE102014011846.0A|DE102014011846A1|2014-08-08|2014-08-08|Drive arrangement of a vertical roller mill and method for operating the same|
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