Use 1 gear to loosen the soil before planting. Rice leveling hand towing and M-74 type leveling machine supporting the use of hand towing speed should choose 3, 4 gears. The speed of straw returning hand tow is generally 1 or 2 gears, and 1 gear is mostly used in actual production. Secondly, the shape of the processing size does not meet the standard requirements. During the inspection process, it was also found that the rototiller knife of another plough blade factory in Beijing (production date 2007.04) failed the index. Before the rotary plowing operation, the arrangement and installation of the rotary cutter is an important task. Improper installation will seriously affect the quality of the operation, and due to the unbalanced blade rotation, will lead to damage to the machine parts and unit vibration, and not. Left-curved and right-curved blades should be staggered as far as possible, in order to make the knife shaft at both ends of the shaft bearing force balance. General blades are arranged according to the rules of the spiral line. Successive blades into the soil, the greater the axial distance on the knife shaft, the better to avoid blockage. In the process of knife shaft rotation a week, in the same phase angle, is a knife into the soil, in order to ensure the work stability and knife shaft load uniformity. Configure more than two blades, should ensure that the amount of soil cutting equal, in order to achieve good quality of crushed soil, the bottom of the trench after plowing flat. The main reason for this is not strictly according to the requirements of the drawings under the material, production and processing of process tooling is not qualified, the management system is not perfect. Guangdong Province around the common use of industrial agriculture 12-K walk-behind tractor supporting rotary tiller, the knife shaft is equipped with a total of 16 blades, left and right half staggered arrangement, for rice fields, dry land, etc., especially vegetable land tillage, the effect is better. When the soil moisture content is less than 20%, hand towing and 2BG-6A type strip sower, hand towing speed should be selected 2 or 3 gears; when the soil moisture content is greater than 30%, hand towing speed should be selected 2 gears; in general, hand towing speed should be selected 1 or 2 gears mixed method of installation The blades are staggered inside and outside, after plowing, the surface is smooth. External installation method Except for the two blades at the outer end, the remaining blades are all installed outward, and after plowing, the middle of the ground is concave. Internal method of installation, all blades are facing the blade shaft, after plowing, the middle of the ground convex. Hand tractor (hereinafter referred to as hand tractor) farmland operations speed should be based on soil type, surface conditions, soil moisture content, the power of the hand tractor and the corresponding agronomic requirements and other factors to ensure the quality of operations and production efficiency. Rotary hand tractor and rotary tiller supporting the use of dryland operations hand tractor speed is appropriate to choose 1, 2 gears, rotary knife speed of 188 revolutions per minute; paddy field operations hand tractor speed is appropriate to choose 2, 3 gears, rotary knife speed of 240 revolutions per minute.