Abstract: In order to solve the problem of the large range of falling speed of escape decelerator, on the basis of the fixed orifice hydraulic resistance escape control device, a load- sensing automatic speed- regulating hydraulic decelerator is proposed. In this paper, the working principle of the load-sensing automatic speed-regulating hydraulic decelerator is described, the structure and dynamic parameters of load-sensing hydraulic decelerator are established. The key factors that affect the descent of the load- sensing automatic speed- regulating hydraulic decelerator are analyzed, the relationship between the descent speed, the diameter of the throttle and the weight of the human body are deduced, the operating characteristics of the load-sensing automatic speed- regulating hydraulic decelerator were analyzed by an example. The load-sensing hydraulic decelerator is able to control speed automatically by sensing body weight, the decreasing speed within a narrow range of change, and improve the stability of escape speed, therefore, the load-sensing automatic speedregulating hydraulic decelerator can work in close to 1.5 m/s, which is implemented in the security of national standard drop speed within the range of 0.16~1.5 m/s, and enhancing the working efficiency of the escape velocity and decelerator. This research lays a theoretical foundation for the development of highend hydraulic decelerator.

Key words: load- sensing, automatic speed regulation, decelerator, characteristic analysis