Design And Test Of Eccentric And Non-circular Planetary Gear Train Weft Insertion Mechanism

Textile industry is one of the basic manufacturing industries in China,rapier loom has excellent performance and high market share.The weft insertion mechanism is one of the five core mechanisms of rapier loom.Through the function of the weft insertion mechanism,the spindle of the loom can change the constant rotation and make the weft insertion sword head circulate repeatedly so that the weft yarn can penetrate the shed.There are many kinds of weft insertion mechanism,among which the variable-pitch spiral drive,conjugate CAM weft insertion mechanism and spatial four-link link are the most common weft insertion mechanism.However,China is not the birthplace of such weft insertion mechanism innovation,so the development of the loom industry is greatly limited.This paper describing the eccentric and non-circular planetary gear train of rapier loom weft insertion mechanism,the weft insertion mechanism belongs to contemporary new weft insertion mechanism.Through modeling and optimizing the eccentric and non-circular planetary gear train weft insertion mechanism and then verifying the performance of the weft insertion mechanism through virtual simulation,the main research contents of this paper are as follows:1)With weft insertion sword head motion law as the research direction of the ideal,analysis of rapier weft insertion process flow,selection for three Hermite interpolation polynomial in the transitional period of the acceleration curve.The speed of the weft insertion sword is obtained through integration.The displacement curve is set as the ideal motion curve,which not only meets the requirements of rapier weft insertion process,but also has good motion characteristics.2)Mathematical model construction:Written in MATLAB,the movement simulation software was used for reverse design and the reverse mathematical model was established.The main parameters of non-circular gear planetary gear train weft insertion mechanism and the influence of parameters on non-circular gear joint curve were calculated by simulation software.Under the action of human-machine interaction,rapier loom has been continuously upgraded and optimized,and the process parameters basically meet the requirements of the mechanism operation 3)Build a dynamic model,use the sequential solution method of dynamic equation to calculate the force of each hinge point and gear tooth engagement,and compile the dynamics analysis software of non-circular gear planetary gear train.According to the dynamic analysis and comparison of different process parameters and mechanism parameters that meet the motion requirements of weft insertion mechanism,a set of process parameters and mechanism parameters that meet the requirements of weft insertion mechanism and have good dynamic characteristics are obtained4)With the help of ABAQUS software,deduce and calculate the contact strength of non-circular gear through the formula,further calculate the contact situation of non-circular gear with finite element.The strength of elliptical gears and non-circular gears is checked by using the strength calculation formula,and the results show that the strength of gears selected in the design of the weft insertion mechanism basically meets the requirements.5)The virtual prototype technology(ADAMS technology)is used to build the three-dimensional model of weft insertion mechanism,and the assembly and simulation are carried out.The simulation results show that the kinematics model of weft insertion mechanism established in this paper is correct.Finally,the prototype is developed and tested.The test results show that the weft insertion mechanism can meet the requirements of rapier weft insertion technology.