The invention provides a parallel-opening-closing self-adaptive
robot finger device with double annular flexible parts, and belongs to the technical field of
robot hands. The finger device comprises a base, two finger sections, two
knuckle shafts, an
actuator, two sets of flexible part
wheel train transmission mechanisms, a convex block pushing disc, a spring, a limiting convex block and the like. According to the finger device, parallel-opening-closing pinching and self-adaptive envelope-grabbing functions are achieved through combination of the single
actuator, the two sets of flexible part
wheel train transmission mechanisms with the reasonably set
transmission ratio, the spring, the convex block pushing disc, the limiting convex block, the finger sections movably connected in a sleeving mode and the like; an object can be pinched by horizontally moving the
second finger section, and the first finger section and the
second finger section also can be sequentially rotated to envelope objects in different shapes and sizes. The master-slave
driving mode through the two sets of flexible part
wheel train transmission mechanisms is adopted by the finger device, the grabbing range is large, and dead moving zones are avoided; meanwhile, the under-actuated mode is adopted, two knuckles are driven by only one
actuator, and complex sensing and control systems are not needed; the finger device is compact in structure, small in size, low in manufacturing and maintaining cost and suitable for a
robot hand.