Abstract:
Aiming at the problems of poor roof stability, high operational risk, relatively low efficiency and others in the process of hydraulic support withdrawal in large minig height working face, based on the practice of the 10303 working face in Xinglongzhuang Coal Mine, a new integrated rapid withdrawal process of "segmented brushing expansion and roadway forming - hydraulic frame lifting device - precision sliding rail self-movement" is designed and applied. During the brushing expansion stage, the vertical convergence quantity of the roof and floor is controlled within ± 20 mm through high-strength anchor cable support, forming progressive cross-sections of 4.8 m, 7.3 m, and 11.9 m; The dismantling chamber is equipped with KYX-17-4 hydraulic frame lifting device to achieve the "human-machine separation" dismantling of 7 t level components; The actual measured guiding deviation of the sliding rail guidance system is less than ±10 mm (laser rangefinder), and the bracket self-movement is smooth and continuous. The industrial test results indicate that the withdrawal cycle is shortened from the traditional 40 d to 21 d, the high-risk operation links are reduced by over 80%, the single bracket dismantling efficiency is improved by 2.5 times, and the overall withdrawal cycle is shortened by 47.5% approximately. The research provides a feasible technical path for the efficient, safe, and intelligent withdrawal of hydraulic supports in large mining height fully mechanized mining faces.