The thresher is used for segmentation or segmentation combined harvesting, which is to thresh the crop after harvesting by hand or harvester. The threshing machine can be divided into a simple thresher, a semi-double thresher and a double thresher according to the degree of threshing; if it is divided according to the grain feeding method, it can be divided into a full feeding thresher and a semi-feed thresher. If divided according to the threshing elements, it can be divided into the rod type, the nail type, the bow type and the impeller type; for example, the axial flow type and the cut flow type according to the flow direction of the crop. (1) Simple thresher The simple thresher has only a threshing device, which cannot separate and clean the grain. The result of the treatment is a mixture, which needs further processing. (two) semi-multiple thresher The semi-multiple thresher has the functions of threshing, separating and clearing grain, and can obtain relatively clean kernels, but the threshing is not thorough and there is still a small amount of mixture. (3) Compound thresher In addition to the functions of threshing, separation and grain clearing, the compound thresher also has a re-de-relating, re-cleaning and grading device to obtain different levels of clean kernels. (4) Full feed thresher When the whole feeding thresher is threshed, the crop stems all enter the threshing device, the production continuity is good, the production efficiency is high, the loss is small, but the stem is broken, the stem and the grain are mixed, easy to block, and the separation and cleaning power loss is large. (5) Semi-feed thresher When the semi-feed thresher is threshed, only the head of the crop is fed into the threshing device, the power consumption is small, the stem can be kept intact, but the production efficiency is low, and the spikes of the fed seeds are required to be concentrated and neat, and are mostly used for removing rice. , poor adaptability to other crops. (6) Axial flow thresher When the axial flow thresher is threshed, the crop moves spirally between the drum and the concave plate in the axial direction. The structure of the threshing method is relatively simple, the removal rate is high, the separation time is long, the breaking rate is low, but the power consumption is large, and the decanted material There are many broken grasses, and the separation device is required to work. (7) Cut-flow thresher When the threshing thresher is threshed, the crop moves in the direction of the tangential direction of the drum in the drum, the residence time of the crop in the drum is short, and the separation performance is poor. (8) Ripper type thresher The rod-type thresher has a simple structure and a threshing element, which is suitable for crop varieties. It has good threshing, separation performance and less grass, but uneven feeding or crop moisture has a great influence on the quality of work. (9) Nail-type thresher The threshing element of the nail-type thresher is a nail tooth, which has strong gripping ability and strong threshing ability. It has good adaptability to uneven feeding, moist rice, soybean and other crops, but there are many broken grasses, and the separation ability of the concave plate is low. The power consumption is large. (10) Bow-toothed thresher The threshing elements of the bow-toothed thresher are arched teeth and are mostly used in semi-feed threshers. (11) Impeller type thresher The threshing element of the impeller threshing machine is a high-speed rotating impeller. The suction generated by the impeller helps the crop to feed. The working conditions are relatively clean, but the grasping ability is poor, the removal rate is low, the adaptability to uneven feeding is poor, and the separation ability is poor. Lower. Axial full-feed threshers and semi-feed threshers are used in a wide variety of threshers.