Dynamic Analysis Of Rotary Speed Change Mechanism Driven By Cam Slide

Dobby occupies a dominant position in modern textile machinery.As an important part of the dobby,the modulator directly determines the production quality of the loom.Therefore,the research on the modulator has certain engineering practical significance for optimizing the kinematic performance of the dobby.This article mainly takes the modulator as the research object,and conducts indepth research on the mechanism of the kinematics and dynamics characteristics of the mechanism during operation.The specific research content is as follows:First,the motion principle of the modulator is analyzed,and the mathematical model of the modulator,eccentric mechanism,motion transmission mechanism and heald frame is established.On this basis,a calculation program was developed to numerically solve the kinematic characteristics of the main shaft,heald arm and heald frame.Second,the intrinsic dynamic characteristics of the modulator are explored,and the dynamic model of the modulator driven by the cam slider is constructed.Based on the nonlinear theory,the solution method is established by the third-order Runge-Kutta method.The influence of the machining error introduced by the cam profile simulation on the vibration characteristics of the modulator is analyzed,and the detailed dynamic calculation and analysis are carried out.Based on the kinematics of the modulator,the influence of heald frame load on gear drive torque is studied,a mathematical model for the reverse solution of gear drive torque is constructed,and the method for reverse solution of gear drive torque is deduced,so as to calculate the theoretical value of drive torque.Third,ADAMS software is used to establish a virtual prototype of the modulator,and the results of the virtual prototype simulation is compared with the theoretical numerical calculations of the motion curves of the main shaft,heald arm and heald frame and the amplitude of the driving torque of the gear,so as to verify the validity of the constructed kinematics model and dynamics model of the modulator.Combined with ANSYS software,the rigid-flexible coupling analysis of the modulator is carried out.According to the simulation results,the stress and strain analysis of the flexible component is carried out,the natural frequency of the component is obtained and the maximum force position of the component is analyzed,which provides a theoretical reference for the optimization of the mechanism.Finally,based on the principle of the cooperation between the dobby and the loom,a performance test bench for the modulator is built,and a detailed experimental method is built to study the driving torque of the gear.The current monitoring system is designed from the aspects of hardware and software to realize the information collection of the driving current of the dobby.From the experimental point of view,the results of the theoretical analysis of the modulator model are verified.