In the production process, takes place frequently the malfunction of trolley runing-departure for draper-type agglomeration engine.

Mechanical transmission conceptual design of draper type conveyor is such one that can exert the capacity of designer and is suitable to be accomplished by expert system with "if-then" rules.

It is summarized that the function, disposal principle and how to set the tension travel of the draper type conveyor tension apparatus. The influencing factor on tension travel is also analyzed.