| The automation and high power is a trend of machinery development.The continuous progress in terms of power,material performance and processing methods promoted rapid development of machines.Currently,our impulse variable speed device mainly applies to situations of small and medium-power and low-speed.Therefore,it still has broad application prospects and adapts to the trend of machinery to develop new impulse variable speed device of high power,high speed and running smoother and more efficient.Speed-regulating mechanism is the core component of impulse variable speed device.It is difficult to adjust the length of the rack in the continuous movement,due to an increase in power and increasing of the rack quality of pulsation type continuously variable transmission.Therefore,it seems more necessary to explore and study that the timely adjustment of motion parameters achieved through adjusting the crank length.According to task requirements of crank timely speed regulation,this paper came up with three kinds of new speed-regulating mechanisms,based on the above needs.They are three hearts speed-regulating mechanism,screw drive speed-regulating mechanism and differential crank speed-regulating mechanism.The three kinds of speed mode are value of research and extension,after their composition structure,working principle and the pattern of motion are analyzed and studied.In this paper,the non-coaxial dual output impulse variable speed device for application object,the differential crank speed-regulating mechanism is detailedly designed and kinematics and dynamics analysis.The Simulation analysis of kinematics and speed characteristics of the speed-regulating mechanism is completed by multi-body dynamics software ADAMS.It shows that the differential crank speed-regulating mechanism can achieve continuous speed in the case of spindle keep switch and crank zero.With the development of control technology,the mechanical transmission consciously combined with control in the process of studying Speed-regulating mechanism.So,the electromagnetic clutch is introduced in differential crank speed-regulating mechanism to achieve visualization and automation of speed process.In this paper,the automatic control module of differential crank speed-regulating mechanism is built as the core of SCM.It controls the on and off of electromagneticclutch through the interrelation of output shaft speed of transmission of measured and target speed of inputted to control the working status of the differential crank speed-regulating mechanism. |
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