According to the power configuration and the type of hooking, the grain combiner is divided into self-propelled, tractor-tracted (with or without dedicated engines), suspended and semi-suspended. According to the method of feeding the crop into the threshing device, it is divided into a full-feed type grain collecting machine (with all the straw and stalks entering the threshing device) and a semi-feeding grain collecting machine (the straw part enters the threshing device, and the other end is clamped Hold delivery). According to the use of grain combiner, it is divided into common type (mainly harvested wheat), rice combination machine and sloping grain type grain collecting machine.
The structure of the towed grain combiner is simpler than the self-propelled type, and the tractor used as the traction power can be moved to other work during the non-harvest season; however, the maneuverability during operation is poor. Manual or other types of machinery are required to clear the lane before starting work on each plot. The self-propelled grain-receiving machine can open the road by itself, has good maneuverability, convenient conversion of the plot, and high labor productivity, but the annual utilization rate of the engine is low. The suspended and semi-suspended grain combiner combines the advantages of traction and self-propelled, but the tractor's driver's seat is not high enough, the view of the ground in front of the machine is poor, and the weight distribution and transmission configuration of the machine are affected by the tractor. Structural limitations are difficult to justify, affecting machine stability and operational performance. The connection between the semi-mounted and the tractor is simpler than that of the suspension type, and the ability to adapt to terrain changes is strong. The full-feed grain combiner harvests the versatility of the various crops, but the required power is large. After harvesting, the stems are broken and scattered, and can only be used as fertilizer or as feed. The semi-feeding grain combiner requires less power and keeps the stems relatively intact, but has poor adaptability to crop growth conditions and cannot harvest corn, beans and other crops. Since the 1970s, there has been a traction grain combiner in North America that only has a pick-up device and no cutting device. It is designed to pick up and harvest the straw that is harvested in the field by the windrower.
