Returning crop straws to the fields can not only increase fertility, strengthen water storage capacity, improve overall soil performance, but also reduce straw burning and protect the atmosphere. The use of straw to return crop straw directly to the field has become the main method of processing crop stalks. Through the promotion of mechanization of crop straw returning in recent decades, straw returning machines have developed rapidly. Different manufacturers of straw returning machines are improving the design of straw returning machines. Although different casing shapes and tool types are used, it is a common feature of all manufacturers to increase the rotational speed of the cutter returning blade. Unfortunately, while increasing the rotational speed of the cutter blade axis of the straw returning blade, the problem of the “shift shift†of the cutter shaft has not been explored by the manufacturers so far. It is necessary to shift the gear of the straw returning blade. Because the crop is sparse, the tractor can work at high gear, but if the blade of the straw returning machine also works at the original rotation speed, the crushing effect will be deteriorated. In addition, the shifting gear of the cutter shaft can also adapt to the change of the blade state; the new blade has good crushing effect, but the load is relatively heavy and is suitable for low-speed operation; after the blade is worn, the crushing effect is gradually reduced, but the load is also reduced, and the high speed is used. Not only can increase the crushing effect, but also extend the life of the blade. Before the straw returning machine, where the cutter shaft can be "shifted," was designed, the company where the author was selling was recommending the Jiangsu Model 720 tractor to match the 4J-180 straw returning machine because of the former's power output. The shaft can provide 2 rotation speeds, namely 663r/min and 798r/min, so that the blade axis of the straw returning machine can also have 2 rotation speeds, namely 1823r/min and 2195r/min. Through more than 20 cases of practice, it shows that this is a high-quality, efficient, low-cost choice.
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