Stubble burying, puddling, and land leveling combined operation machine and operation method thereof

A stubble burying, puddling, and land leveling combined operation machine, comprising a main assembly, wherein the main assembly comprises a base rack, auxiliary racks arranged on the base rack, and rear connectors arranged at a back end of the base rack;

• a leveling component is arranged on the rear connectors;
• and
• the rear connector comprises a leveling connection rack arranged at the back end of the base rack and a support rack arranged on the leveling connection rack, the leveling connection rack is connected to the base rack via at least two traction ropes, the traction ropes are configured for driving the leveling component to move forward and backward relative to the base rack, and when the traction ropes retract to a position relative to the base rack, the leveling component is in a suspended state above ground;
• the leveling component comprises a leveling plate arranged at back ends of the leveling connection racks, joint blocks arranged on the leveling plate, and stoppers respectively arranged on the joint blocks;
• a traction component is arranged between the leveling plate and the leveling connection rack,
• an adapter plate matching with the stopper is arranged on the leveling connection rack, and an adapter protrusion is formed on the adapter plate;
• the traction component comprises a traction cylinder arranged on the base rack and the traction ropes extending outward from the traction cylinder, the traction ropes are connected to the leveling plate, and
• through-holes matching with the traction ropes are provided in the leveling connection rack;
• the stopper comprises a slot formed on the joint block and a retaining block slidably connected in the slot, the retaining block is provided with a first inclined surface and the adapter protrusion is provided with a second inclined surface matching with the first inclined surface, an elastic member is provided between the retaining block and the slot, a counterweight component is arranged between the leveling connection rack and the support rack, and the counterweight component comprises a plurality of counterweight blocks slidably connected to the adapter plate;
• when the adapter plate and the rear connector are engaged, the first inclined surface matches with the second inclined surface, enabling the counterweight blocks to shift between the adapter plate and the joint block.