Floor grinding apparatus having dust sealing rings

    公开(公告)号:US11179825B2

    公开(公告)日:2021-11-23

    申请号:US16172051

    申请日:2018-10-26

    发明人: Frank Wehrmann

    摘要: The present invention relates to a floor grinding apparatus (100) with a housing (110) having an interior space (111) open to one side, a carrier plate (120) rotatably mounted in the interior space (111) for receiving abrasives, and drive unit (130) adapted to rotate the carrier plate (120), the housing (110) having an inner dust sealing ring (112) with at least one recess (115), wherein the inner dust sealing ring (112) divides the interior space (111) into an inner portion (113) and an outer portion (114), and wherein the carrier plate (120) is disposed in the inner portion (114), at least one extraction opening (116) disposed in the outer portion (114), and an outer dust sealing ring (117) enclosing the interior space (111), the inner dust sealing ring (112) and the outer dust sealing ring (117) being arranged to define a common working plane parallel to the plane of rotation of the carrier plate (120).

    Water trailing detection system
    9.
    发明授权

    公开(公告)号:US11083357B2

    公开(公告)日:2021-08-10

    申请号:US16006629

    申请日:2018-06-12

    申请人: Nilfisk A/S

    摘要: A floor cleaning machine can comprise a chassis, a cleaning mechanism, a control system, and a cleaning operation sensing system connected to the chassis. The chassis can be configured for movement along a cleaning path. The cleaning mechanism can perform a cleaning operation. The liquid system can provide liquid to the cleaning mechanism. The recovery system can recover liquid from the cleaning operation. The control system can control performance of the cleaning operation. The cleaning operation sensing system can detect a condition of the cleaning operation. The cleaning operation sensing system can comprise a water trailing detection system comprising: a frame connected to the chassis aft of the recovery system; an absorbent medium connected to the frame; and a moisture sensor in communication with the control system to alter a signal in response to moisture in the absorbent medium.