Priciple Study And Trial Production Of Two-dimensional Gearbox With Rotating And Axial Reciprocating Output

With the advancement of modern machining technology and the diversification of industrial demands,the traditional one-dimensional gearbox has been unable to meet the special needs of certain industry production.It has been shown that the extruded product performance has been improved in the processing of the high polymers while axial reciprocation is applied.In this context,the article conduct an innovative research on the gearbox used in high polymer processing equipment,and proposed a new two-dimensional gearbox that can realize output shaft rotation and axial reciprocation.With detailed study of the structural principles,simulation analysis,optimization and trial gearbox,the conclusions can provide theoretical basis for the development of the gearbox.Finally,a new type of gearbox with output shaft rotation and axial reciprocating motion was successfully invented.The main researches of the project include:Firstly,by comparing the advantages and disadvantages of existing vibrating extruder devices,a structural model of two-dimensional gearbox with output shaft rotation and axial reciprocating motion was proposed,and its transmission principle and performance characteristics were introduced in detail.By using the method of adjusting the amplitude of the double-eccentric mechanism and the characteristics of the eccentric structure,the paper designed the relevant components of reciprocating motion,and was focused on the working principle of the output shaft rotation and axial reciprocating motion mechanism.Secondly,according to the force behavior of the reciprocating components,the force model of the reciprocating components was mathematically modeled,the influence of the force on the reciprocating components was analyzed,and then the force and the critical movement conditions of the axial reciprocating components which can realize axial reciprocation were solved.Thirdly,based on the dynamics simulation software-ADAMS,the gearbox dynamics model was established by use of the gear Hertz contact stress theory.With kinematics and dynamics simulation analysis of the whole gearbox,the feasibility the gearbox transmission theory was verified and the dynamic meshing forces between each pair of gears were obtained,which provided load boundary conditions for the analysis of the key components of the gearbox.Then,force analysis and FEM simulation of the key components of the gearbox were performed,which were prepared for the targeted structural optimization design of gears,input shaft and eccentric shaft.And the finite element modal analysis model of transmission gearbox case was established by using elastic dynamics theory,then the natural frequency of the case was obtained,which indicated that the design reasonably avoided the gear engagement frequency.Because reciprocation structure was subject to harmonic loads,this paper conducted modal analysis and harmonic response analysis,and studied its dynamic characteristics under different frequency harmonic loads.And the results provided a theoretical basis for the optimization design of the reciprocating component.Finally,a new two-dimensional gearbox prototype was produced and a screw extruder test platform is built.The correctness and feasibility of the new two-dimensional gearbox transmission principle was verified.Due to time limitation,the specialized performance tests of the gearbox were not conducted.