Abstract: Aiming at the safety and stability problems of the mine hoist in the emergency braking, a constant deceleration braking system based on the three-way proportional pressure reducing valve was proposed to study the dynamic characteristics of the hoist under emergency braking conditions. A simulation model of the hoisting system considering the constraints and contact of each component was established in RecurDyn and the dynamic model of the three-way proportional pressure reducing valve was established in Simulink. Then, a rigid-flexible coupling constant deceleration emergency braking co-simulation model was constructed, the pressure and drum's speed were controlled by a dual closed-loop PID controller, and the emergency braking under lowering conditions were analyzed. The results show that the tracking error of the drum's speed under the lowering condition is greater. The large load can increase the overshoot of the drum's speed and the shock vibration of the system at the initial braking stage. The three-way proportional pressure reducing valve improves the dynamic response and stability of the system. This study provides new methods for the smooth braking of large hoisting equipment.

Key words:  mine hoist; constant deceleration braking; three-way proportional pressure reducing valve; co-simulation