RESEARCH ON THE SEEDING DEPTH ADJUSTMENT DEVICE BASED ON THE TIP OF FURROW OPENER FORCE MEASUREMENT

An active-action seeding depth automatic control system was designed , with the purpose of effectively ensure consistency and stability when seeder is operated in field. Strain-gauge pressure sensor used system, which can detect force on tip furrow opener soil real time, proceed to next step judge change according signal. In order achieve depth, signal formation circuit will send a exceeds appropriate range, motor be controlled rotate clockwise or counterclockwise drive rack pinion movement realize vertical lift opener, so that remains within range. The test results indicate adjustment device based measurement has stable reliable performance for controlling an average qualification rate 94.56% variation coefficient only 9.29%, greatly ensures under condition 30-70mm working speed 3-7km/h.