METHOD FOR DEALING WITH FAULTS OCCURRING DURING THE MANUFACTURE OF A MATERIAL WEB
    1.
    发明公开
    METHOD FOR DEALING WITH FAULTS OCCURRING DURING THE MANUFACTURE OF A MATERIAL WEB 有权
    方法处理错误。在生产期间材料幅

    公开(公告)号:EP2231924A1

    公开(公告)日:2010-09-29

    申请号:EP08863004.1

    申请日:2008-12-12

    申请人: Metso Paper, Inc.

    IPC分类号: D21G1/00 D21G9/00

    摘要: The invention relates to a method for dealing with faults occurring during the calendering of a material web, said method comprising at least the following steps of: -identifying the location of a fault (H) on the surface of a roll (5) or in a material web and estimating or calculating an arrival time of the fault (H) at a roll nip (N) and a dwell time for the fault in the roll nip, -transmitting from a control system (4) to at least one digital valve unit (100), used for controlling a nip pressure of the roll nip (N), a feed-forward adjustment instruction (F) for dealing with a fault in the roll nip (N) of a calender, -reducing as per adjustment instruction (F), through the intermediary of at least one digital valve (1), a nip pressure of the roll nip (N) at the latest when the fault (H) arrives at the roll nip (N) and increasing the nip pressure as the fault exits the roll nip.

    A CONTROL METHOD AND AN ADJUSTMENT METHOD AND A CONTROL ARRANGEMENT AND AN ADJUSTMENT ARRANGEMENT FOR A FIBRE WEB MACHINE
    3.
    发明公开
    A CONTROL METHOD AND AN ADJUSTMENT METHOD AND A CONTROL ARRANGEMENT AND AN ADJUSTMENT ARRANGEMENT FOR A FIBRE WEB MACHINE 审中-公开
    控制以及设置和控制及程序调整纤维绒机

    公开(公告)号:EP1664426A1

    公开(公告)日:2006-06-07

    申请号:EP04767035.1

    申请日:2004-09-09

    申请人: Metso Paper Inc.

    IPC分类号: D21G1/00

    CPC分类号: D21G9/0045 D21G1/0073

    摘要: The object of the invention is a control and an adjustment method for the fibre web machine. According to the invention -an emitting voice is measured continuously at least from one section of the fibre web machine and frequency bands (df) and/or the combinations of the frequency bands and amplitudes of the same, which correlate state and change of different process values, are separated measuring signals (fm); - the measuring signals are compared with reference signals (fref), which correlate an ideal state or a desired state; and - control signals are generated from deviations of the measuring signals and reference signal (fA), by which control signals the measured process values are returned closer to the ideal state or the desired state.

    DIGITALHYDRAULISCHER REGLER
    10.
    发明公开
    DIGITALHYDRAULISCHER REGLER 有权
    数字液压控制

    公开(公告)号:EP2435715A1

    公开(公告)日:2012-04-04

    申请号:EP10713639.2

    申请日:2010-04-13

    申请人: Metso Paper, Inc.

    IPC分类号: F15B11/042

    摘要: The invention relates to a digital hydraulic controller (2) comprising at least two rows of valve elements, one of said rows of valve elements being adapted to connect a supply conduit to a controller outlet and the other row of valve elements being adapted to connect the controller outlet to an outlet conduit. The valve elements of every row of valve elements are connected in parallel in the controller (2) and can be switched simultaneously either individually or in various combinations thereof. Each valve element of a row of valve elements has a different flow cross-section. The valve element which has the smallest flow cross-section is present in the row of valve elements twice. The invention further relates to a system unit comprising a differential cylinder (1) and a digital hydraulic controller (2) which has four rows of valve elements, two of which are connected to one pressure chamber of the differential cylinder with their common controller outlet while the other two rows of valve elements are connected to the other pressure chamber of the differential cylinder (1) with their common controller outlet. Due to the fact that the pressure in the two pressure chambers can be independently set, the differential cylinder can be used as a linear actuator that can be precisely set.