刚柔混合止血机械手的设计与分析

Design and Analysis of a Rigid-Soft Hybrid Hemostatic Manipulator

  • 摘要: 针对战场环境下无人化救援工作中伤员肢体快速止血问题,设计了一种可安装在救援机械臂末端的刚柔混合止血机械手。该机械手由止血气囊与刚性欠驱动夹爪组成,气囊的柔软特性使得机械手与伤员肢体之间的接触更加安全。在刚性结构的约束下,气囊充气后向中心膨胀,以包裹伤员出血肢体实现压迫止血功能。对机械手进行了运动学、静力学分析,并建立了气囊径向变形的有限元模型,得到气囊在工作状态下的边界轮廓以及接触宽度。同时,以人体四肢为对象建立了止血气囊挤压力的理论模型。此外,对实验样机进行人体上肢、下肢测试,实验结果表明该机械手具有可靠的夹持能力和止血能力,验证了其有效性。

     

    Abstract: Aiming at the problem of rapid hemostasis of wounded limbs in unmanned rescue work in a battlefield environment, a rigid-soft hybrid hemostatic manipulator is designed, which can be installed at the end of the rescue robotic arm. The manipulator is composed of a hemostatic airbag and a rigid underactuated gripper. The softness of the airbag makes the contact between the manipulator and the injured limb more secure. Constrained by the rigid structure, the airbag inflates and expands to the center to wrap the bleeding limbs of the wounded to achieve compression hemostasis. The kinematics and static analysis of the manipulator is carried out, the finite element model of the radial deformation of the airbag is established, and the boundary contour and contact width of the inflated airbag are obtained. Moreover, a theoretical model of the squeezing pressure of the hemostatic airbag is established based on the human limbs. In addition, the experimental prototype is tested on human upper and lower limbs. The experimental results show that the manipulator has reliable clamping and hemostatic abilities, which verifies its effectiveness.

     

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