Diseño y construcción de un robot paralelo por cables de tres grados de libertad para rehabilitación parcial de hombro.

Abstract

The purpose of this research is to design a parallel robot manipulated by Three Degrees of Freedom cables (3DOF) for partial shoulder rehabilitation through a dynamic and kinematic study. By means of the bibliographic study, materials, dimensions, mechanical and electronic components for the development of the prototype were investigated, which was analyzed and determined. Later a study of the alternatives of design and construction of the robot was made establishing the physical characteristics for the fulfillment of its function, using a dynamic and inverse cinematic analysis of the end effector, a dynamic and kinematic model was found. Using the Matblab software, we found the cable length of 870mm, the maximum force to be supported of 143.04 N, and the maximum torque of the 8.8 N.mm actuators selected a nylon rope, NEMA 23 pitch motors and designed a cable collection system for angle compensation. Next, the structural system, platform systems, cable collection system and, lastly, the electronic system for the control of movements were sequentially constructed and assembled. Finally, the functional check of the mechanical elements and the control of established movements was carried out, as well as a manual of operations and maintenance to avoid damage and misuse of the equipment. The prototype performs the intermediate rehabilitation exercises achieving a partial recovery of the shoulder and can be used in physical rehabilitation centers.