Determination of Pneumatic Puncher Turn Radius during Change of Its Motion Path in Soil

Resumo

In order to ensure accurate hole-making in soil, it is required to adjust motion path of pneumatic puncher by deflecting its rear body relative to longitudinal axis. The structural layout of the path control mechanism, which allows upgrading series-production pneumatic punchers, is presented. The solution of problem on forces required to change the pneumatic puncher path in soil is given. Soil body is considered as a rigid-plastic medium, and the deflector is assumed as a nondeformable body. The problem is solved in two stages: penetration of the deflector in soil and motion of the pneumatic puncher with the rear deflected at a certain angle in soil. The loads applied to the rear for changing pneumatic puncher path in soil and the turn radius under deflecting force are determined.