For loosening the soil before sowing, choose 1 block. The paddy field hand trailer is used together with the M-74 flat field machine, and the hand trailer speed should be selected in 3 and 4 gears. The speed of straw returning to the field by hand is generally 1 or 2 gears, and 1 gear is mostly used in actual production. Secondly, the shape processing size does not meet the standard requirements. During the inspection, it was also found that the rotary tiller of another coulter factory in Beijing (the production date was 2007.04) failed this indicator. Before the rotary tillage operation, the arrangement and installation of the rotary tiller blade is an important task. Improper installation will seriously affect the work quality, and due to the unbalanced rotation of the blade, it will cause damage to the parts and increase the vibration of the unit, which is unsafe. Left-curved and right-curved blades should be staggered as much as possible to balance the forces on the bearings at both ends of the shaft. Generally, the blades are arranged in a helix rule. The larger the axial distance on the cutter shaft of the blades that are successively buried in the soil, the better to avoid clogging. In the process of one rotation of the cutter shaft, at the same phase angle, a cutter must be immersed in the soil to ensure the working stability and the uniform load of the cutter shaft. When more than two blades are configured, the amount of soil cutting should be equal, so as to achieve good quality of crushed soil and smooth ditch bottom after ploughing. The main reason is that the material is not cut strictly according to the drawing requirements, the process tooling for production and processing is unqualified, and the management system is not perfect. The 12-K walking tractor commonly used in Guangdong Province is equipped with a rotary tiller. There are 16 blades on the blade shaft. The left and right sides are arranged in a staggered manner. They are used for paddy fields, dry land, etc., especially for the cultivation of vegetable fields. better. When the soil moisture content is lower than 20%, the hand dragging should be used together with the 2BG-6A drill, and the manual dragging speed should be selected as 2 and 3 gears; when the soil moisture content is greater than 30%, the manual dragging speed should be selected as 2 gears; In general, the speed of hand dragging should be 1st and 2nd gears, the blades are staggered inside and outside, and the surface is smooth after ploughing. External installation method Except for the two outermost blades that are installed inside, all the other blades are installed outwards. After ploughing, the middle of the ground is concave. Internal installation method When installing, all the blades are facing the center of the cutter shaft. After tilling, the middle of the ground is raised. The speed of a walk-behind tractor (hereinafter referred to as a walk-behind) farmland operation should be determined according to factors such as soil type, surface condition, soil moisture content, power of the walk-behind and corresponding agronomic requirements to ensure the operation quality and production efficiency. The rotary tiller is used together with the rotary tiller. The speed of the hand trailer for dry land operations should be 1 and 2 gears, and the rotational speed of the rotary tiller is 188 revolutions per minute; 240 revolutions per minute.