Abstract:

Based on the D-type knotter, a mandatory strip type knotter was designed using the principle of reverse engineering. The performance of the knotter was simulated by the Pro/E software. The designed mandatory strip type knotter is mainly consisted of an oscillating roller cam mechanism, an incomplete olecranon gear mechanism, an incomplete primary rope folder bevel gear transmission mechanism, and a secondary rope folder helical gear and screw transmission mechanism. Based on the reversed data and according to the analyses of the kinematics and the gear tooth profile meshing characteristics, the axic inclination angle of the incomplete olecranon gear mechanism, the incomplete primary rope folder bevel gear transmission mechanism, and the secondary rope folder helical gear and crew transmission mechanism is 96°,96°,and 80°,respectively. The cam contour of the designed driven gear cam structure is formed by 2 circular arcs with radiuses of 28 and 18 mm and their tangent. The results of simulation by Pro/E showed that the designed mandatory strip type knotter knots steadily without interference, the structure of the driving gear cam and the alecranon gear cam surfaces changes smoothly, the cam follower can achieve the scheduled move and stop without jump, the main mechanisms operate at the appropriate time sequence, and in summary, the requirement of the knotter practical operation can be satisfied.

Key words: agriculture machinery, reverse engineering, square baler, knotter, simulation, design, kinematics analysis