Groups of concave discs are used as working parts. The blade edge plane is perpendicular to the ground and has an adjustable deflection angle with the forward direction of the unit.
During operation, the harrow blades roll forward under the action of tractor traction and soil reaction force. The blades of the harrow blades cut into the soil to cut off grass roots and crop residues, and the soil is raised to a certain height along the concave surface of the harrow blades and then flipped down.
