Key Technologies Research Of Fast Loading And Braking Experiment Platform

With the development of modern industry, there is an urgent need for short stroke and high acceleration fast loading equipment. Fast loading equipment which is driven by impact cylinder, high-speed hydraulic cylinder or motor already has many mature applications. Impact cylinder can make it achieve high speed, while the thrust fluctuation, the speed and positions can’t be controlled continuously, and the oscillation at the end of stroke also can’t be solved easily. Loading equipment driven by high speed hydraulic cylinder is complex and expensive. The efficiency and stiffness of loading equipment driven by rotary motor with ball screw or slider-crank mechanism are too low.To overcome these disadvantages, this thesis designed a fast loading system driven by linear motor. Finite element analysis was carried out on the important parts to ensure safe and reliable. The guide had been chosen, its life expectancy was calculated, the energy absorption of the hydraulic absorber was also analyzed, according to the conditions of loading system. The mathematical model and vector control model of linear motor were established. It was analyzed how the perturbation factors, such as loading resistance, detent force, friction, thrust ripple and time-delay, affect the precision of linear motor servo in the process of running. A feed-forward compensator was designed. There were two synchronization control models of double linear motors which were established on the basis of mechanical coupling and the control model quickly switching, the models validities were verified by simulation. A control system for the loading device was developed. Control program was written with ST. A human-computer interaction interface was designed. The performance of the fast loading equipment was tested with the control system.Test results show that the fast loading transmission system meets the design requirements which has fast response speed, good repeatability, can reach the experiment required speed in the specified location, and the oscillation amplitude is small at the end of the stroke.