Study On Transmissionc Haracteristics Of A New Compound Flexible Drive Mechanism

The new compound flexible drive mechanism consists of a rolling nut body and a composite shaft in two parts.The agency’s design inspiration comes from ball screw and parallel spring mechanism.Its movement and screw similar to the rolling nut body in the composite axis maneuver to drive the horizontal axis of the composite feed.Different from the traditional hard-axis screw drive,the new composite flexible drive mechanism adopts a flexible composite shaft,which can realize bending transmission and improve the environment adaptability of the mechanism,and has broad application prospect.In this paper,theoretical modeling analysis and experimental research on the transmission characteristics of the new composite flexible drive mechanism.Under the precondition that the composite shaft has good flexibility,the flexible shaft and slender shaft in the composite shaft are optimized to improve the load capacity and work efficiency of the mechanism.The influence of the slender shaft ’s limiting role on the force characteristics of the flexible shaft is analyzed.The relationship between the ultimate load capacity of composite flexible driving mechanism and the nut’s movement position is deduced.The influence of impact load on the mechanism is analyzed and the motion characteristics of the composite shaft and the roller are modeled and analyzed.The relationship between the speed of composite shaft and the rotational speed,position and axial load of the nut body is obtained.The force of the roller is modeled and analyzed to deduce that the roller does not slip under the ideal condition.The efficiency model is established from the two aspects of friction loss and elastic potential energy loss.The formula for calculating the efficiency is deduced theoretically and an improved scheme to reduce the mechanism loss is proposed according to the principle of roller friction loss.The existing experimental platform was used to test the load capacity,the transmission roller slip and the transmission efficiency of the composite flexible drive mechanism,and the theoretical analysis was carried out to verify the correctness of the theory.Finally,a novel peristaltic pipeline robot was designed and manufactured with the new compound flexible drive mechanism,which proved its practicability.