Rotary actuator with motion limiting for industrial robot - has actuator fluid supplied through swivel with limiting flow restrictor

摘要

The industrial robot using rotary hydraulic actuators includes a facility to limit and control the stopping action. Each rotary motion has a shaft (8) that rotates within a sleeve (9) with a large clearance volume (12). Hydraulic fluid is passed through a supply time (13) and exits through a bore (15) in the central shaft. The fluid is used to supply the hydraulic drive motor. A projecting segment (16) is located to control the angle of operation of the actuator when the outlet (14) passes via the small clearance (18) the flow is reduced and the actuator slows down.