Abstract: Abstract: In order to study loads characteristics of cutting head of longitudinal readheader under two different hardness of rock cutting, the process was described, and using simulation methods to study its loads. The simulation results show that the law of load fluctuates including larger cycle fluctuation and small fluctuation in larger cycle unchanged in a periodic (rotating lap time of cutting head). Load fluctuation coefficient of cutting head cutting from unidirectional compressive strength of the rock to unidirectional compressive strength of the rock than load fluctuation coefficient of cutting head cutting unidirectional compressive strength of the rock increases obviously. Amplitude of Small fluctuations increased significantly when angle of levels , and load fluctuation coefficient of becomes 3.2 times, 8.9 times, 6.2 times of load fluctuation coefficient of cutting head cutting unidirectional compressive strength of the rock. These conclusions show that to avoid vibration damage to the machine, the cutting head should avoid cutting the layered rock.

Key words: Keywords: Longitudinal roadheader, cutting head, layered rock cutting, load simulation