Study And Design Of Positive Cam Shedding Device For Air-jet Loom

With the proposals of "Industry 4.0" and "Made in China 2025",the global manufacturing industries which include the textile industry develop in aspects of intelligence,digitization,serialization,and greenization.In order to cope with increasingly stringent requirements of the textile and garment industry in various aspects under the context of the current "buyer’s market",how to improve the automation and high efficiency in the production link using the textile machinery has become an important part in the technological innovation of the textile industry.As a key component to produce woven fabric,the shedding device severely restricts the weaving machine’s weaving efficiency and the quality and application of the product.Therefore,it is of great significance to study the shedding device.This thesis takes the positive cam shedding device as the research object,the main contents include the following aspects:Firstly,the reverse design of the shedding cam is accomplished,the digital prototype of the positive cam shedding device is obtained through modeling and assembling based on CREO.In addition,according to the research of the corresponding relationship between the different types of fabric weave and the shedding cam,the series design of the positive cam shedding device is completed by superimposing combined working units to widen the product application range of the device.Secondly,kinematics characteristics of the positive cam shedding mechanism are analyzed.The dynamic statics analysis of each component of the cam shedding mechanism is carried out based on D’Alembert’s principle.The balance equations are listed and then solved by MATLAB,the results lays the foundation for the optimal design of the mass and geometry of each component.At the same time,the three-dimensional model of cam shedding mechanism is introduced into ADAMS dynamics software to carry out multi-body dynamics simulation and the result analysis of the mechanism.Thirdly,in consideration of the elastic deformation in the shedding movement,the elastic dynamic characteristics of the positive cam shedding mechanism are studied,the dynamic model of the mechanism is created and further simplified,and its dynamic response differential equation is obtained.Through the modal analysis and flexible processing of the key components in the mechanism using ANSYS finite element software,the cam mechanism is verified to have meet the requirements of high-speed motion,Different flexible components are introduced into ADAMS respectively to replace the rigid body to establish Prototype of rigid-flexible coupling of the mechanism,thereby performing dynamic simulation and comparing and analyzing the simulation results.Finally,the intelligent remote real-time monitoring system of the positive cam shedding device is preliminarily studied.The overall structural design of the system,the design of the software analysis framework,and the design of the solution by combining the data acquisition and wireless transmission modules are completed.At the same time,the related hardware for data acquisition in the system is selected.The related research in this thesis is conducive to promoting the development of textile industry to more high speed,high efficiency,high quality,high reliability,energy saving and consumption reduction,and to achieve automation,continuity,information,and intelligence in textile engineering.At the same time,it has laid a good theoretical foundation for quickly responding to market demands and realizing multi-variety and high-efficiency production and weaving.