Research On The Stability Of The Boom Luffing Mechanism Of Aerial Cage At The Decline Stage

Aerial cage is special equipment to manned aerial work. Due to its special work condition, security and stability become important indicators of its performance. At present, there are problems such as impact and vibration when the arm descended luffing which is a serious threat to the safety of staff. So it has great significance to do research on the stability of aerial cage when the arm descending. In this paper, the research object is the flexible arm luffing mechanism hydraulic system of a26-meter self-propelled aerial cage. The main works are as follows:1. Research status of aerial cage and arm luffing mechanism is summarized. Main contents and research significance of the issue is put forward.2. Arm luffing mechanism is in-depth analyzed. The mathematical model of luffing mechanism is built; The mapping relationship between luffing cylinder displacement and height of the working platform and the force status of luffing cylinder piston rod when arm luffing are researched. Curves that lay the foundation for researching on the stability of the arm, such as force on cylinder, height-displacement, are got through simulation.3. Working principle of arm luffing mechanism hydraulic system is in-depth researched and the mathematical model of hydraulic system is established. Combining theory analysis of arm luffing hydraulic system with the simulation results of mechanical system, influence caused by the characters and the control pressure style of balance valve, the characters of proportional control valve and loads on luffing mechanism’s working stability are studied. Projects improving running stability are put forward and the effect is theoretical studied.4. Considering the influence that made by luffing mechanism and hydraulic systems on the boom running stability, AMEsim/ADAMS model of luffing system is built to optimize arm’s running stability when declining. Compared with several projects, the optimization project used in this paper is proved effective.5. The optimized system and original system are tested in real cage. The result shows that the theoretical research and simulation analysis in this paper is true.