Design and Simulation Analysis of the Pickup and Crushing Mechanism of Silage Round Bundling Machine

In response to the problems of poor crushing quality and uneven cutting length when harvesting straw silage using existing circular bundling machines in China, this paper proposes a differential sawing type picking and crushing mechanism scheme, which can achieve differential rotation cooperation between the picking and crushing knife and the disc knife, which is conducive to increasing the cutting line speed and force during straw picking and crushing. The dynamic analysis of the motion form of the picking and crushing mechanism was conducted to determine the main factors affecting the crushing effect. Using EDEM discrete element simulation software, taking the speed, tilt angle, and speed ratio of the picking, and crushing knife as experimental factors, the straw crushing rate and power consumption were selected as performance evaluation indicators for the picking and crushing mechanism. A three factor and three level quadratic orthogonal rotation combination experiment was conducted. The results showed that when the picking and crushing knife speed was 1800 r/min, tilt angle was 50°, and speed ratio was 1.2, the straw crushing rate was 90.3%, and power consumption was 7.3kW, meeting the national standard requirements. The differential sawing type picking and crushing mechanism proposed in this study provides a theoretical basis for the innovative design of silage round bundling machines.