CALCULATION OF SOILS CUTTING FORCE BY KNIFE TYPE CUTTING ELEMENTS OF THE EARTHMOVING MACHINE

Abstract

The application of bucketless bottom unloading rotor with oblique cutting knife type cutting elements on the earthmoving machine allows enhancing significantly its excavation quantities in the road construction compared with widely used machinery as bulldozers, auto-graders. A loading diagram of the forces acting on an oblique cutter installed on a bucketless bottom unloading rotor is given. The action of forces is considered with account for the complex movement made by the cutting element in space as a result of the rotational movement and the end feed on the rotor along straight-line trajectory during layer by layer excavation of the soil by rotor cutter. The dependences were obtained for determining the components of the digging force by a single oblique cutting element of a bucketless bottom unloading rotor under straight-line end feed. The bucketless bottom unloading rotor with diagonal cutting knife type cutting elements, installed on the earthmoving machine’s frame, moving straightforwardly, allows not only to increase its output via rotation velocity of the bucketless bottom unloading rotor but also to excavate highly stiff soils, inaccessible for existing earthmoving machines.