Kinematic and force analysis of a bucket frontlift

Abstract

Theoretical researches have been carried out and the obtained mathematical expressions characterize a periodic cycle loader with a center pivot frame articulation as a moving mechanical system. The type and the nature of movement of the loader operating element have been considered. The design parameters and the operating modes affect crucially on the interaction between the bucket and the cargo. We have obtained the interdependence between the velocity and the digging depth of a bucket frontlift into the bulk cargo, as well as the kinetic energy of a bucket frontlift as a system, in its initial position. During the force analysis it has been determined the impact of the studied factors on the tractive power of the frontlift and the total digging force, which depends on the tangent tractive power, rolling resistance force and frictional sliding force of a frontlift.

Kinematic analysis of the axle box unit operation

“…During the operation, on the one hand, the roller size decreases along the diagonal line BK, but, on the other hand, the distance between edges 1 and 2 increases. This total operation wear forms a clearance from wear S1, and leads to the increase in the roller rotation, but the values of the angles (φ and φ1) decrease (figure 3) [8,9].…”

Optimization of the radial bearing geometry by the dimensional analysis

“…The race flanges of the optimal bearing are inclined to the vertical line at an angle β = 0.008 rad (figure 2). The contact point of the roller and the flange lies on the intersection of the perpendicular, which is lowered from the sphere cylinder of the roller end surface onto the plane, limiting the flange [10]. This point is separated from the roller axis of the roller by the value: ℎ = 𝑅 1 sin𝛽 ≈ 𝑅 1 𝛽 = 1200 • 0.008 = 9.6 mm.…”