Design and experiment of anti-vibrating and anti-wrapping rotary components for subsoiler cum rotary tiller

The commonly used subsoiling cum rotary tiller machine (SRT) in Northern China is a combination of subsoiler and horizontal rotary tiller, however backfilling of the subsoiling slot, excessive vibration and plant residue wrapping on rotary components has been rarely considered. Therefore, the rotary components and assembly were redesigned to address these issues and to an SRT fitted with IT225 short curve rotary blades behind the V-shape subsoiling slots and IIT245 long curve rotary blades between the tines. Long and short blades were fitted on a rotor in a double helix, with optimal spiral angles of 65º and 90º, and phase angle of 147º and 180º, respectively. Compared with the commonly used SRT (CSRT), the additional anti-wrapping cutting blades in the circumferential and axial direction of ASRT could remove hanging residue on the blade holders, wrapping on the rotor and formation of an isolation layer. Moreover, the cutting edge curve of anti-wrapping cutting blades was an exponential curve. Field tests demonstrated that the redesigned SRT with anti-vibrating and anti-wrapping rotary components (ASRT) had was a significant advancement over the CSRT. Moreover, the working depth of rotary tillage was more stable, while other observations confirmed that backfilling of the subsoiling slot was also improved.