The Design And Research Of Gravity Driven Turnover Device

Fully automated production line is the current trend.As an important part of automatic production line,the turn-over device is very important.The existing turnover mechanisms are based on motor drive or hydraulic drive for power supply,which have problems such as the velocity changes too fast,reverse process is not stable,not economical and so on.To solve the above problems,this thesis proposes a gravity driven turn-over device without motor driver.Then,the kinematics,dynamics and reversing stability of the turnover mechanism are studied.The simulation results verify the working performance of the mechanism and at last,the overall mechanism is analyzed and optimized.First of all,the thesis analyzes the research status of the reversing device,and puts forward some feasible design based on the characteristics of the gravity driven turn-over device applications.The mechanism is obtained through the comparative analysis of the various schemes.According to the kinematic requirements,the mechanism is synthesized to get the kinematic demensions.Secondly,with or without the consideration of damping respectively,a four bar turnover mechanism without motor is developed and its equivalent dynamic model is built.Then the dynamic model is analyzed utilizing numerical method.Combining the Assur Group Method and MATLAB,a numerical method is proposed to solve the dynamic model.The correctness of the dynamic model and its analyzing method are validated by ADAMS modeling and simulation which provides a basis for the optimization of the turnover mechanism.Thirdly,the optimization of the mechanism is carried out according to the requirement of turnover mechanism to minimize the impact during the operation of the mechanism The multiple objectives are transformed into a single objective model utilizing the linear weighted sum method,and the parameters of this mechanism are optimized using GA method combined with the MATLAB optimization toolbox.As a result,the mechanism becomes more stable and efficient.Finally,adjustability and adaptability of the mechanism are studied,and a design method of the adjustable gravity driven turnover device is proposed,and the range of application is expanded.