Objective  To design a grass separation equipment with driven rotating tooth disk, and resolve the disadvantages of existing grass separation equipment, such as the complex structure, low clearance rate and weak adaptability for straw coverage.

Method  A grass separation equipment with driven rotating tooth disk and grass allocation grids was designed. EDEM simulated experiments were performed with the impact factors of straw covering height and equipment forward speed. Field trafficability test was performed and the straw clearance effects on the seed bed belts were obtained.

Result  The simulated result showed that this equipment worked steadily when the straw covering heights were from 100 to 200 mm, with the clearance rates ranging from 49.0% to 57.5%. Clearance rates increased with the increasing of equipment forward speed and straw covering height. The field experiment showed two slight congestions with 50.9% straw clearance rate at the operating speed of 3 km·h^–1. At the operating speed of 5 km·h^–1, the trafficability was good with no congestion and the straw clearance rate enhanced to 57.5%.

Conclusion  This equipment has good weed control effects, and it can meet the practical needs of no-till operation in wheat field.