Semi-feeding combine harvester threshing solution

Half-feeding combine harvesters, such as those from Yanmar and Kubota, offer superior harvesting methods, better threshing quality, and more efficient power consumption compared to full-feed models. This is due to their unique crop-holding and threshing techniques, along with supporting technologies. These machines are increasingly popular among farmers. However, issues like incomplete threshing can still occur, especially when harvesting late rice in certain regions. From the analysis of problems encountered during harvesting and maintenance services in Xianyang Town, Pucheng County, it has been found that improper threshing in semi-feeding harvesters is mainly caused by several factors. First, the operating environment and the skill level of the operator play a significant role. Although these machines have excellent performance, they require specific conditions and skilled operation. Crop height is one important factor. The vertical header of a half-feeding harvester cuts the crop and transports it via conveyor chains to the threshing chamber. Therefore, the crop height must be within a certain range—typically 70–120 cm for some models, with a limit of 55–130 cm. If the crop is too short or too tall, it may not enter the threshing chamber properly, leading to unclean threshing. The maturity of the crop also affects the process. Some farmers rush the harvest due to weather or other pressures, resulting in crops with high moisture content. This makes the grain and stems too tough, leading to poor threshing. High harvesting speed can worsen this issue. Operator technique is another critical factor. When operators don’t follow the manufacturer’s guidelines or prioritize speed over quality, it can lead to inefficient threshing. This is often seen in competitive markets where economic efficiency takes precedence over precision. To address these issues, operators should adjust the machine’s speed based on crop maturity and growth conditions. Maintaining the engine at its rated speed ensures proper rotation of the threshing drum. Too low a speed reduces threshing efficiency, while too high a speed increases losses. Maintaining the correct threshing depth is also essential. The header height should be adjusted according to the crop height. Since only the head portion enters the threshing chamber, improper depth can cause excessive straw buildup, increasing the load on the drum and reducing threshing quality. Choosing the right harvesting direction is important too. Harvesting in the direction of crop lodging helps straighten the plants before cutting. Reverse harvesting should be avoided, as it can lead to uneven cutting, blockages, and improper clamping, which causes the drum to become overloaded. In addition to external factors, the internal condition of the harvester itself plays a major role. The header and threshing chamber are key components affecting threshing quality. The header must be checked for alignment and sharpness. If the bifurcation tips are not aligned with the knife edges, or if the blades are dull, it can result in uneven cutting and poor threshing. Conveyor chains and guide rails should also be inspected for tension and wear to ensure proper clamping force. Inside the threshing chamber, worn parts like the threshing cylinder, concave screen, and drum walls can create gaps that reduce threshing efficiency. Worn cutting knives can cause stem entanglement, increasing the drum’s workload and reducing performance. Regular maintenance and timely replacement of worn parts are crucial. Checking and adjusting blade clearance, ensuring proper chain tension, and maintaining the correct overlap between threshing arches and feed strips help achieve clean and efficient threshing. In conclusion, by carefully analyzing and addressing issues during harvesting, following operational procedures, and maintaining the machine properly, most problems related to incomplete threshing can be resolved. This ensures high-quality harvesting results and improves overall efficiency.

Other Household Products

Household Electric Appliances,Smart Home Appliances,Small Household Appliances

Ningbo Shuangtuo International Trade Co., Ltd. , https://www.nbst-sports.com