Purpose

Vortex grippers use tangential nozzles to form vortex flow and are able to grip a workpiece without any physical contact, thus avoiding any unintentional workpiece damage. This study aims to use experimental and theoretical methods to investigate the effects of nozzle diameter on the performance.

Design/methodology/approach

First, various suction force-distance curves were developed to analyze the effects of nozzle diameter on the maximum suction force. This study determines the tangential velocity distribution on the workpiece surface by substituting the experimental pressure distribution data into simplified Navier-Stokes equations and then used these equations to analyze the effects on the flow field. Subsequent theoretical analysis of the distribution of pressure and circumferential velocity further validated the experimental results. Next, by rearranging these relationships, the study considered the effects of nozzle diameter on the inherent vortex gripper characteristics. In addition, this study developed various suction force-energy consumption curves to analyze the effects of nozzle diameter.

Findings

The results of this study indicated that the vortex gripper’s circumferential velocity and maximum suction force decrease with increasing nozzle diameter. Nozzle diameter did not significantly affect the inherent frequency of the vortex gripper-workpiece inertial system or the corresponding suspension stability of the workpiece. However, an increase in nozzle diameter did effectively increase the vortex gripper’s suspension region. Finally, as the nozzle diameter increased, the energy required to achieve the same maximum suction force decreased.

Originality/value

This study’s findings can enable optimization of nozzle design in emerging vortex gripper designs and facilitate informed selection among existing vortex grippers.

中文翻译：

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涡旋夹持器喷嘴直径的实验研究

目的

涡旋夹具使用切向喷嘴形成涡流，并且能够在没有任何物理接触的情况下夹持工件，从而避免了意外的工件损坏。这项研究旨在使用实验和理论方法来研究喷嘴直径对性能的影响。

设计/方法/方法

首先，绘制了各种吸力-距离曲线，以分析喷嘴直径对最大吸力的影响。本研究通过将实验压力分布数据代入简化的Navier-Stokes方程，确定工件表面的切线速度分布，然后使用这些方程分析对流场的影响。随后的压力和圆周速度分布的理论分析进一步验证了实验结果。接下来，通过重新排列这些关系，研究考虑了喷嘴直径对固有涡流夹持器特性的影响。此外，这项研究开发了各种吸力-能量消耗曲线，以分析喷嘴直径的影响。

发现

这项研究的结果表明，涡流夹持器的圆周速度和最大吸力随着喷嘴直径的增加而减小。喷嘴直径并未显着影响涡旋夹持器-工件惯性系统的固有频率或相应的工件悬架稳定性。但是，喷嘴直径的增加确实有效地增加了涡流夹持器的悬挂区域。最后，随着喷嘴直径的增加，达到相同最大吸力所需的能量也会减少。

创意/价值

这项研究的发现可以使正在出现的涡旋夹持器设计中的喷嘴设计最优化，并有助于在现有的涡旋夹持器中进行明智的选择。