Abstract:

Tree deep planting is one of the best methods in semiarid sand area with high-planted tree's survival and keeping rate. Deep Planting Earth Auger is the ideal and useful machine for deep planting. The function tests of the earth auger are focused on the relations between resistance torque with the drill bit rotation speed, with feeding speed and with soil hardness. The results showed that machine would have most efficiency in tree planting with the auger rotation speed of 360～400 r/min and with the feeding speed of 0.047 m/s. The maximum resistance torque was 53 Nm in Keerqin sand soil conditions with 90 cm diameter of drilled hole. The designed Deep Planting Earth Auger satisfied the resistance and could supply more torque than the requirement in existing machine conditions.

Key words: Desertification, Tree deep planting, Earth auger, Resistance torque, Function test