电激活旋流夹持器的理论建模与效率改进

Kaige Shi, Xin Li
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引用次数: 0

摘要

电激活的旋转流夹持器利用旋转气流对工件产生负压和吸力。旋转气流由与电动机相连的风扇直接驱动,因此夹持器只消耗电力。由于旋转气流产生的离心力有助于防止真空泄漏,因此夹持器可以处理表面粗糙不平的工件。在本研究中,对驱动旋转腔内旋转流动的扭矩和夹持器产生的吸力进行了建模,并在此基础上得到了夹持器的效率。理论模型表明,减小吸力和增大夹持器尺寸可以提高效率。还发现,在风机的顶端增加一个圆盘,可使夹持器的效率提高35%。圆盘可以将风机与上壳壁之间的流动转化为紊流平面Couette流,从而使驱动转矩降低24%。此外,圆盘将上壳壁附近旋转不足的流动与其下方旋转充分的流动隔离开来,从而通过增加吸力进一步提高效率。通过实验验证了理论模型和效率的提高。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Theoretical Modeling and Efficiency Improvement of Electrically Activated Rotation-Flow Gripper
An electrically activated rotation-flow gripper uses rotating airflow to generate negative pressure and suction force on a workpiece. The rotational flow is directly driven by a fan connected to an electrical motor, so the gripper only consumes electrical power. Because the centrifugal force generated by the rotating flow helps prevent vacuum leakage, the gripper can handle workpieces with rough and uneven surfaces. In this study, the torque to drive the rotational flow in the rotating chamber and the suction force generated by the gripper are modeled, based on which the efficiency of the gripper can be obtained. The theoretical model shows efficiency could be improved by decreasing the suction force and increasing the size of the gripper. It is also found that adding a disc at the top end of the fan can improve the efficiency of the gripper by 35%. The disc could transform the flow between the fan and the upper shell wall into a turbulent plane Couette flow, thus reducing the driving torque by 24%. In addition, the disc isolated the insufficiently rotating flow near the upper shell wall from the sufficiently rotating flow below it, thereby further increasing the efficiency by increasing the suction force. The theoretical model and the efficiency improvement are verified by experiments.
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