Virtual Prototype and Experiment Study on Mining Truck Air Brake System

摘要

Accurate calculation method of drum brake braking torque of mining truck air brake was studied in this paper at first, then hydro pneumatic suspension features and the tire characteristic parameters were studied. The dump truck virtual prototype model was established, service brake and emergency brake performance were simulated. The simulation results of braking deviation show that the rear wheel braking force is greater than that the front wheel. Under cornering braking condition, the brake deviation increases about 85 mm for each 5% difference between the left and right brake forces of the front wheel; 5% difference between the left and right brake forces of the rear wheel, the brake deviation increases about 120 mm. Braking locking sideslip simulation shows that when the front wheel is locked, the side slip of the vehicle deviates from the track up to 2m, which is very dangerous in the mountain mining area. The truck performance field tests were carried out such as service brake, emergency brake, hydraulic retarder and brake system response time, etc. The results show that the truck braking performance can also be improved. Because braking pressure rise time is slightly long, that it can be improved by gas circuit improvement (equipped with the quick-acting valve and wet-road valve, etc.), and the superiority of the improved gas path is also verified by virtual prototype simulation and real vehicle experiment. The truck braking torque can be further promoted by increasing air pressure or brake friction coefficient or brake design rationality. Through the implementation of these methods, the braking performance of the mine dump truck has been improved significantly.