Investigating the Coupling Effect of High Pressure and Hot Air on External Friction Angle Based on Resistance Reduction Tests on Subsoiling Tillage Tools for Sandy Clay Loam

Sandy clay loam has the characteristics of both sand and clay. Because these characteristics, frictional resistance adhesive occur between soil tillage tool. The combined effect two forces increases external friction angle tool, thus increasing working resistance. To address this issue, study investigated coupling high pressure hot air on by using a self-developed device to measure angle. Test results showed that high-pressure tool formed curtain layer which acted as lubricant, thereby reducing decreased airflow increased. reduction in moisture content subsoil less than 30% reduced approach with was verified tests subsoiling shovel; shovel under 14.8%, demonstrating effective shovel.