Abstract: In the structure design of suspension type conveyor line having uphill and downhill
function, to predicate and effectively avoid the dynamic collision of the pendants running in the slope
have been enterprise′ urgent needs. In order to meet the requirement of parametric design on parts and
visual collision detection for the conveyor line, a simulation system is developed for rapid collision
detection for the climbing pendants with the data interface NX/Open API. The system is helpful to
modify the modeling parts by the way of parameterization, and realize automation of virtual assembly
and motion simulation for the climbing conveyor. Finally, the collision is eliminated and the structure
is optimized through once more simulation test and its effect feedback under different parameters.

Key words: NX secondary development, collision detection, virtual assembly, motion simulation