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    • 122. 发明公开
    • Control of torque in floor maintenance tools by drive motor load
    • Bodenwischgeräten的Drehmomentsteuerung mittels Motorlast。
    • EP0301437A2
    • 1989-02-01
    • EP88111860.8
    • 1988-07-22
    • Tennant Company
    • Field, Bruce F.Kasper, Joseph G.
    • E01H1/05A47L11/40
    • A47L11/4011A47L11/4066A47L11/4069E01H1/053
    • An automatic tool torque compensator for a surface maintenance machine such as a sweeper or scrubber (10) includes an actuator (86, 286) for raising and lowering one or more rotatable surface maintenance tools (16) and one or more electric (54, 56) or hydraulic (254, 256) motors for driving the tools. There is a circuit for sensing the cur­rent load in at least one of the electric motors, or the differ­ential pressure in one or more of the hydraulic motors, and pro­viding a signal representative thereof. There is a circuit for manually selecting a desired tool torque to be applied from a plurality of possible tool torques and for providing an electri­cal signal representative thereof. The electrical signal repre­sentative of the desired tool torque to be applied to the tools and the drive motor load current signal or the differential hy­draulic pressure signal representative of actual tool torque applied to the tools are used to control the actuator for raising and lowering the surface maintenance tools. This automatically varies the pressure of the tools against the surface to maintain a desired torque in the tools at a nearly constant value even though the surface may vary in its resistance to the tools due to variations in its elevation or texture, or the degree of soil­age on it.
    • 一种用于表面维护机器例如清扫器或洗涤器(10)的自动工具扭矩补偿器包括用于升高和降低一个或多个可旋转表面维护工具(16)和一个或多个电气(54,56)的致动器(86,286) )或用于驱动工具的液压(254,256)电机。 存在用于感测至少一个电动机中的当前负载或一个或多个液压马达中的差压的电路,并且提供表示其的信号。 存在用于从多个可能的工具转矩手动选择要施加的期望的工具扭矩并且用于提供表示其的电信号的电路。 代表施加到工具的所需工具扭矩的电信号和驱动电机负载电流信号或表示施加到工具的实际工具扭矩的差动液压信号用于控制致动器以升高和降低表面维护 工具。 这可以自动地改变工具对表面的压力,以将工具中的期望扭矩保持在几乎恒定的值,即使其表面可能由于其高度或质地或污染程度的变化而对工具的抵抗力变化 在上面。