Synchronous Optimization Design of Braking System for Shearer Carrier
In order to improve the response speed of the braking system of the shearer carrier and solve the problem of poor braking synchronization between the front and rear vehicles,the braking system was optimized based on the simulation analysis.By calculating and analyzing the braking efficiency of the carrier,it was concluded that among the optimized parameters,the main factors affecting the response speed of the braking system were the time taken to eliminate the brake clearance and the time taken to increase the braking force of the brake.The mathematical model of the braking system was established.Through Simulink simulation,it was concluded that the response speed of the braking system could be effectively improved by reducing the clearance of the brake friction plate under non-bra-king conditions.The back pressure control valve group was proposed to minimize the friction plate gap.The maximum back pressure value was determined to be 1.29 MPa by calculation.It was found through experiments that the back pressure control valve group hardly worked when the back pressure was less than 0.9 MPa.At the same time,in order to prevent the phenomenon of braking delay when the carrier was running normally,the back-pressure value was set to 1.2 MPa.It was determined through experiments that the back pressure control valve group improved the synchronization of the response of the front and rear brakes.The experimental results show that the bra-king time difference between the front and rear vehicles is reduced to 0.24 s compared with that before optimization,which ensures the safe operation of the brake system of the carrier.Finally,the improvement of the response speed of the braking system was verified by ex-periments.The results show that the braking distance in conventional braking is 5.2 m,the braking distance in emergency braking is 3.2 m,which meets the technical requirements of MT/T 989-2006 The general technical condition of the flameproof diesel vehicle with the rubber wheels for the mine.
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