Abstract: The actual movement of materials in discharge process is very complicated when materials leave the head pulley. The force acting on the materials is analyzed by using kinematics theory and the conditions causing critical states are researched, which include horizontal transport, upward transport and downward transport. The tangent angles and the positions of the materials comparing with the original positions are also identified when the conveyer belt enter the roller by different angles. The conclusion is educed after studying the movement of the particles on the belt. Finally the mathematical equation of discharge trajectory is established and the trajectory is plotted on computer.

Key words: computer application, material movement, discharge trajectory, movement status