Improvement on hydraulic lifting platform of light rail bogie separation equipment

YU Jin， PU Heng-lin
（College of Mechanical Engineering， Chongqing University， Chongqing 400030， China）

Abstract： Aiming at poor positional error problem arisen in the course of using the hydraulic lifting platform （a kind of bogie separation devices has been employed in the light rail No.2 line of Chongqing Municipality as the key maintenance equipment for light rail vehicles），a set of corresponding solutions were introduced to improve the hydraulic system of the lifting platform，the advantages of original system were retained，hydraulic cylinders with position detection and proportional valves and the closed loop synchronous control technology were used in the improved system，the multi-stage hydraulic cylinders and ordinary electromagnetic valves in the original hydraulic system were replaced. The results indicate that the horizontal plane positional error between the lifting beam and the track beam is less than 2 mm，the side plane positional error is less than 3 mm after the improvement，the lifting platform could run smoothly in a reliable status with high accuracy，ensure the continuous operation of the light rails.
Key words： light rail；bogie separation device；hydraulic lifting platform；system control strategy