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    • 46. 发明公开
    • Slewing control device for crane
    • DrehwerksteuerungsvorrichtungfürKran。
    • EP0454923A1
    • 1991-11-06
    • EP90313170.4
    • 1990-12-05
    • KABUSHIKI KAISHA KOBE SEIKO SHO
    • Yoshimatsu, HideakiFukushima, Koichi
    • B66C23/86
    • B66C23/86
    • A slewing control device for a hydraulic slewing crane (100) adapted to supply a discharge oil from a hydraulic pump (1) through a slewing control valve (2,3) to a slewing motor (6) and control a rotational direction and a rotational speed of the slewing motor. The slewing control device includes a brake pressure control valve (53,54,55) for variably controlling a discharge pressure (PB) of the slewing motor (6), an acceleration pressure control valve (11,12,13) for variably controlling a suction pressure (PA) of the slewing motor (6), and a controller (8) for outputting to both the pressure control valves a pressure control signal to be determined according to an operational condition of the crane upon braking of a slewing body and controlling both the discharge pressure (PB) and the suction pressure (PA) of the slewing motor (6) to control a pressure differential (△p) therebetween. Accordingly, even when a braking torque (TB) is small, the slewing body can be smoothly braked to be stopped at a target position accurately with no oscillation of a suspended load remaining.
    • 一种用于液压回转起重机(100)的回转控制装置,其适于将来自液压泵(1)的排出油通过回转控制阀(2,3)提供给回转马达(6),并且控制旋转方向和旋转 回转电机的转速。 回转控制装置包括用于可变地控制回转马达(6)的排出压力(PB)的制动压力控制阀(53,54,55),加速度压力控制阀(11,12,13),用于可变地控制 所述回转马达(6)的吸入压力(PA)和用于向所述压力控制阀输出的压力控制信号的控制器(8),所述压力控制信号将根据所述起重机在回转体的制动时的操作条件而被确定并控制 排出压力(PB)和回转马达(6)的吸入压力(PA)两者以控制它们之间的压力差(INCREMENT p)。 因此,即使在制动转矩(TB)小的情况下,回转体也可以平稳地制动而在目标位置精确地停止,而不会产生暂停的负载的振荡。
    • 50. 发明公开
    • DAMPING SYSTEM, DAMPING METHOD AND CRANE COMPRISING IT
    • EP3466860A1
    • 2019-04-10
    • EP18198398.2
    • 2018-10-03
    • HMF Group A/S
    • Ballebye, MortenBrændgaard, Gudmund
    • B66C13/06B66C23/86
    • A system (2) for damping undesired oscillations in a movably arranged crane structure (4) is disclosed. The crane structure (4) is hydraulically driven by means of an arrangement comprising at least one hydraulic actuator (10, 10', 60) mechanically connected to an engagement structure (6) attached to the crane structure (4). The at least one hydraulic actuator (10, 10', 60) is in fluid communication with a hydraulic unit (16) through one or more conduits (14, 14', 64, 66). The hydraulic unit (16) is connected to a hydraulic pressure source (30). The hydraulic unit (16) comprises a valve (108) configured to direct hydraulic oil from the hydraulic pressure source (30), to the at least one hydraulic actuator (10, 10', 60). The system (2) comprises a damping member (3) comprising an additional hydraulic unit (40) hydraulically connected to a hydraulic pressure source (30) and to the at least one hydraulic actuator (10, 10', 60). The additional hydraulic unit (40) is configured to deliver an additional hydraulic oil flow and hereby damp the motion of the at least one hydraulic actuator (10, 10', 60) and accordingly damp the oscillations in the crane structure (4).