Combined land preparation machine for returning corn straw to field in full amount

Abstract

The invention discloses a corn straw total returning combined land preparation machine, and relates to the technical field of land preparation machines, the corn straw total returning combined land preparation machine comprises a mounting frame, a hinge frame is rotatably arranged in the mounting frame, a fixing frame is further arranged in the mounting frame, tires are rotatably mounted on the two sides of the fixing frame, a land preparation assembly is arranged in the mounting frame, and a cleaning assembly is arranged on the side face of the mounting frame; a soil turning assembly is arranged on the side face of the fixing frame, the soil preparation assembly and the cleaning assembly are arranged in a linkage mode, the soil preparation assembly is used for smashing and returning the corn straw to the field, and the cleaning assembly is used for cleaning the straw remaining on the soil preparation assembly and turning over the land compacted by the tires. All the components are driven to cooperate through a tractor, a series of operations of pressing, coarse crushing, fine crushing and soil turning and burying of corn straw can be rapidly and continuously completed, manpower and time cost is greatly saved, and the content of organic matter in soil can be increased by straw returning from the perspective of agricultural production.

Description

Technical Field

[0001] The present invention relates to the technical field of land preparation machines, in particular to a combined land preparation machine for returning all corn stalks to fields. Background Art

[0002] In the field of agricultural production, the treatment of corn straw has long been a thorny problem, troubling farmers and environmental protection departments. In the past, the open-air burning of large amounts of straw has become an important source of air pollution. During the burning process, the raging flames release a large amount of smoke, carbon dioxide, carbon monoxide, nitrogen oxides and other harmful substances. These pollutants are like a haze, which not only causes a sharp decline in air quality, makes the sky gray and reduces visibility, but also poses a serious threat to people's health. Long-term exposure to such air pollution will greatly increase the probability of people suffering from respiratory diseases and cardiovascular diseases. The practice of randomly discarding straw is also undesirable. The random accumulation of straw occupies a large amount of public space and areas around farmland, making the originally clean environment messy. What's worse is that these untreated straws provide ideal habitats and breeding places for pests and diseases. Pests and diseases will breed and reproduce in large numbers in the straw, and then quickly spread to surrounding crops, causing crops to be attacked by pests and diseases, resulting in reduced production or even no harvest. The emergence of the corn straw full-scale return to the field combined with the land preparation machine is like a This timely rain has brought hope for solving the above problems. This advanced agricultural machinery has powerful functions. It can efficiently crush straw and return it to the field evenly. In this way, the problem of straw disposal is completely solved, and a series of environmental and social problems caused by unreasonable straw treatment are avoided. From the perspective of soil improvement, straw contains rich organic matter, nitrogen, phosphorus, potassium and other nutrients, which are all necessary nutrients for crop growth. When the combined land preparation machine is used to return all the straw to the field, over time, the straw will gradually decompose under the action of soil microorganisms, and the nutrients in it will be slowly and continuously released into the soil. This not only increases the fertility of the soil, making the soil more fertile and providing sufficient nutrient supply for crops, but also significantly improves the physical and chemical properties of the soil. The originally compact soil becomes looser under the action of straw, forming a good aggregate structure, which greatly enhances the soil's air permeability and water permeability. In this way, the soil's water and fertilizer retention capacity is greatly improved, creating an ideal soil environment for the growth of crops. If the straw is tough, the machine will have more difficulty crushing it, and the blades may easily become entangled in the straw, resulting in power transmission obstruction and stalling. Furthermore, controlling the amount of straw is also crucial. If the straw distribution in the field is uneven, or if too much straw accumulates in a certain area, exceeding the machine's processing capacity, it may cause blockage in the feed port or crushing chamber.

[0003] Combining the above problems, we will find that it is difficult to avoid the above problems at the same time when using the existing corn straw full-return to field combined land preparation machines on the market, and even if they can be solved, they need to be solved through the cooperation of external tools, which makes it impossible to achieve the desired effect. Therefore, we propose a corn straw full-return to field combined land preparation machine. Summary of the Invention

[0004] The object of the present invention is to provide a combined land preparation machine for returning all corn straw to the field, so as to solve the problems raised in the above background technology.

[0005] To achieve the above-mentioned object, the present invention provides the following technical solution: a corn straw full-returning field combined land preparation machine, comprising a mounting frame, an articulated frame rotatably provided inside the mounting frame, a fixed frame provided inside the mounting frame, tires rotatably provided on both sides of the fixed frame, a land preparation assembly provided inside the mounting frame, a cleaning assembly provided on the side of the mounting frame, a soil turning assembly provided on the side of the fixed frame, and the land preparation assembly and the cleaning assembly being arranged in linkage; The land preparation component is used to crush and return corn stalks to the field; The cleaning component is used to clean the straw remaining on the land preparation component; The cleaning assembly is used to turn over the soil compacted by the tires.

[0006] Preferably, the ground leveling assembly includes a first rotating shaft fixedly connected to the side of the mounting frame, a pressing roller is rotatably sleeved on the outer side of the first rotating shaft, and a plurality of notches are opened on the surface of the pressing roller.

[0007] Preferably, the bottom surface of the articulated frame is fixedly connected to a support frame, the side surfaces of the support frame are fixedly connected to a plurality of curved plates, and the ends of the curved plates are fixedly connected to a crushing head.

[0008] Preferably, the side of the mounting frame is also rotatably connected to a second rotating shaft, the outer side of the second rotating shaft is fixedly connected to a plurality of first tilling wheels, and the side of the first tilling wheel is fixedly connected to a plurality of tilling blocks.

[0009] Preferably, a horizontal plate is fixedly connected to the side surface of the mounting frame, and a soil leveling tooth plate is connected to the bottom surface of the horizontal plate.

[0010] Preferably, two cleaning components are provided, and the two ground leveling components are respectively provided on both sides of the mounting frame. The cleaning component includes a first pulley fixedly connected to the end of the second rotating shaft, and the side of the mounting frame is rotatably connected to the second pulley, and the first pulley and the second pulley are jointly provided with a transmission belt on the outside.

[0011] Preferably, the first pulley and the second pulley are both fixedly sleeved with a first limiting disk on their outer sides, the second pulley side is fixedly connected to a driving shaft, and the driving shaft is fixedly connected to a swing plate on its outer side.

[0012] Preferably, a plurality of cleaning columns are fixedly connected to the top of the swing plate, and a cleaning plate is fixedly connected to the side of the swing plate.

[0013] Preferably, the soil-turning assembly includes a connecting rod fixedly arranged on the side of the fixing frame, one end of the connecting rod is fixedly connected to a first connecting ring, and the other end of the connecting rod is fixedly connected to a second connecting ring, the first connecting ring is rotatably sleeved on the outside of the fixing frame, and the inside of the second connecting ring is rotatably connected to a support column.

[0014] Preferably, two second tilling wheels are fixedly connected to the outer side of the support column, and second limiting plates are fixedly connected to both sides of the second tilling wheels.

[0015] Compared with the prior art, the present invention has the following beneficial effects: 1. The present invention sets up a land preparation component and uses a tractor to drive the various components to cooperate, which can quickly and continuously complete a series of operations from flattening corn stalks to coarse crushing, fine crushing and then burying them in the soil, greatly saving manpower and time costs. From the perspective of agricultural production, returning straw to the field can increase the organic matter content of the soil, improve the physical structure of the soil, enhance the soil's water and fertilizer retention capacity, and provide a good soil environment for crop growth. In addition, this treatment method reduces the environmental pollution problems caused by open-air stacking or burning of straw, realizes the resource utilization of agricultural waste, conforms to the concept of green and sustainable agricultural development, and helps to improve the ecological and economic benefits of agricultural production.

[0016] 2. The present invention sets a cleaning component. When preparing the land, corn straw balls stuck on the outer side of the bending plate and the crushing head will affect the normal operation of the equipment and reduce the straw processing efficiency. The existence of the cleaning component utilizes the power of the second rotating shaft to drive the swing plate and the cleaning plate to rotate through the pulley, transmission belt and drive shaft, which can timely and effectively press down the stuck straw balls, avoid component damage due to straw accumulation, extend the service life of the equipment, and ensure the continuous and stable operation of the land preparation component, thereby improving the overall operating efficiency. At the same time, the cleaned straw can be better crushed and buried in the soil, promoting the straw return effect, providing more nutrients to the soil, and promoting a virtuous cycle of agricultural production.

[0017] 3. The present invention sets a soil-turning component. During agricultural operations, excavators and tires can easily compact the soil. The tight soil structure is not conducive to seed rooting and growth, and will cause loose contact between seeds and soil, seriously affecting germination and emergence. The second soil-turning wheel of the soil-turning component can turn over and compact the soil in time, break the compacted soil layer, increase soil permeability and porosity, allow seeds to better integrate with the soil, and create a good environment for seed germination and seedling growth. At the same time, it can effectively alleviate the problem of missing seedlings and broken ridges that may be caused by returning straw to the field, improve the crop emergence rate and uniformity, ensure the quality of crop growth, and ultimately help to improve the output and benefits of agricultural production and promote the stable development of agriculture. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic structural diagram of the present invention as a whole; Figure 2 For the present invention Figure 1 A schematic diagram of the enlarged structure at point A; Figure 3 It is a schematic diagram of a partial three-dimensional structure of the present invention; Figure 4 This is a schematic structural diagram of the cleaning component of the present invention; Figure 5 This is a schematic structural diagram of a cleaning plate according to the present invention; Figure 6 It is a schematic structural diagram of the pressing roller of the present invention; Figure 7 For the present invention Figure 6 A schematic diagram of the enlarged structure at point B; Figure 8 It is a schematic structural diagram of the second tiller wheel of the present invention.

[0019] In the figure: 1. Mounting frame; 2. Articulated frame; 3. Fixed frame; 4. Tire; 10. Soil preparation assembly; 101. First rotating shaft; 102. Pressing roller; 1021. Notch; 103. Support frame; 104. Bending plate; 105. Crushing head; 106. Second rotating shaft; 107. First tilling wheel; 108. Soil turning block; 109. Cross plate; 110. Leveling tooth plate; 20. Cleaning assembly; 201. First pulley; 202. Second pulley; 203. Transmission belt; 204. First limiting plate; 205. Drive shaft; 206. Swinging plate; 207. Cleaning column; 208. Cleaning plate; 30. Soil turning assembly; 301. Connecting rod; 3011. First connecting ring; 302. Second connecting ring; 303. Support column; 304. Second tilling wheel; 305. Second limiting plate. DETAILED DESCRIPTION

[0020] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0021] Example 1 See also Figures 1-8 The present invention provides a technical solution: a corn straw full-return field combined land preparation machine, comprising a mounting frame 1, an articulated frame 2 rotatably provided inside the mounting frame 1, a fixed frame 3 provided inside the mounting frame 1, tires 4 rotatably provided on both sides of the fixed frame 3, a land preparation assembly 10 provided inside the mounting frame 1, a cleaning assembly 20 provided on the side of the mounting frame 1, a soil turning assembly 30 provided on the side of the fixed frame 3, and the land preparation assembly 10 and the cleaning assembly 20 are arranged in linkage; The soil preparation component 10 is used to crush and return corn stalks to the field; The cleaning component 20 is used to clean the straw remaining on the soil preparation component 10; The cleaning assembly 20 is used to turn over the soil compacted by the tire 4.

[0022] As a further definition of the ground preparation component 10 of the present invention, the ground preparation component 10 includes a first rotating shaft 101 fixedly connected to the side of the mounting frame 1, a pressing roller 102 is rotatably sleeved on the outer side of the first rotating shaft 101, and a plurality of notches 1021 are opened on the surface of the pressing roller 102. The bottom surface of the articulated frame 2 is fixedly connected to a support frame 103, and a plurality of curved plates 104 are fixedly connected to the side of the support frame 103. The end of the curved plate 104 is fixedly connected to a crushing head 105. The support frame 103 is provided at the bottom of the mounting frame 1, and the support frame 103 is connected to the support frame 103. The bending plate 104 is connected to the crushing head 105. Driven by the tractor, the support frame 103 moves together with the bending plate 104 and the crushing head 105. When the crushing head 105 contacts the ground, it will be squeezed by the ground. Due to the inertia during the movement, the crushing head 105 will lift up; then, under the action of gravity, the crushing head 105 will move downward rapidly. This cycle repeats continuously, and the crushing head 105 continuously performs high-intensity crushing operations on the corn stalks that have been crushed and coarsely crushed, further refining the corn stalks.

[0023] The side of the mounting frame 1 is also rotatably connected to a second rotating shaft 106, the outer side of the second rotating shaft 106 is fixedly connected to a plurality of first tilling wheels 107, the side of the first tilling wheel 107 is fixedly connected to a plurality of tilling blocks 108, and the side of the mounting frame 1 is fixedly connected to a horizontal plate 109, the bottom surface of the horizontal plate 109 is connected to a soil leveling tooth plate 110, and the soil leveling tooth plate 110 digs the land level.

[0024] The specific implementation of this embodiment is as follows: in order to achieve effective processing of corn stalks and land preparation, a special land preparation component 10 is set in the equipment. The user first firmly installs the mounting frame 1 on the rear of the tractor, and uses the tractor as a power source to drive the mounting frame 1 to move in the field. When the tractor pulls the mounting frame 1 to move, the pressing roller 102 installed on the first rotating shaft 101 rotates accordingly. The pressing roller 102 is in full contact with the corn stalks. During the rolling process, the upright corn stalks are pressed to the ground by their own weight and rotational force, and are subjected to preliminary coarse crushing treatment, so that the shape and structure of the corn stalks are changed, creating conditions for subsequent further crushing and burying. A support frame 103 is provided at the bottom of the mounting frame 1, and the support frame 103 is connected to the bending plate 104 and the crushing head 105. Driven by the tractor, the support frame 103 carries the bending plate 104 and The crushing head 105 moves together. When the crushing head 105 contacts the ground, it will be squeezed by the ground. Due to the inertia during the movement, the crushing head 105 will lift up; then under the action of gravity, the crushing head 105 will move downward rapidly, and the cycle will repeat. The crushing head 105 continuously performs high-intensity crushing operations on the crushed and coarsely crushed corn stalks to further refine the corn stalks. At the same time, the second rotating shaft 106 installed on the side of the mounting frame 1 starts to rotate, driving the first turning wheel 107 on the outside to rotate synchronously. During the rotation, the first turning wheel 107 turns the ground, fully mixes the crushed corn stalks with the soil, and buries the crushed corn stalks into the soil, thereby completing the corn stalk return operation, realizing effective land turning and rational utilization of straw resources, and the leveling tooth plate 110 digs the land level.

[0025] Example 2 See also Figures 1-8 The present invention provides a technical solution: a combined land preparation machine for returning all corn straw to the field. The present invention makes corresponding improvements to the technical problems mentioned in the background technology.

[0026] As a further limitation of the cleaning component 20 of the present invention, the cleaning component 20 is provided with two, and the two ground leveling components 10 are respectively arranged on both sides of the mounting frame 1. The cleaning component 20 includes a first pulley 201 fixedly connected to the end of the second rotating shaft 106, and the second pulley 202 is rotatably connected to the side of the mounting frame 1. The first pulley 201 and the second pulley 202 are jointly sleeved with a transmission belt 203 on the outside. The second rotating shaft 106 is used as a power source. When the second rotating shaft 106 rotates, the first pulley 201 connected thereto rotates synchronously therewith. The first pulley 201 transmits power to the second pulley 202 through the transmission belt 203, so that the second pulley 202 also starts to rotate. The second pulley 202 is connected to the drive shaft 205, thereby driving the drive shaft 205 to rotate.

[0027] The first pulley 201 and the second pulley 202 are both fixedly sleeved with a first limit plate 204 on the outside, and the second pulley 202 is fixedly connected to a driving shaft 205 on the side, and a swinging plate 206 is fixedly connected to the outside of the driving shaft 205. Several cleaning columns 207 are fixedly connected to the top of the swinging plate 206, and a cleaning plate 208 is fixedly connected to the side of the swinging plate 206. A swinging plate 206 is sleeved on the outside of the driving shaft 205. As the driving shaft 205 rotates, the swinging plate 206 starts to make a circular motion. The swinging plate 206 is connected to the cleaning plate 208. During the rotation of the swinging plate 206, the cleaning plate 208 is driven to rotate together. During the rotation process, the cleaning plate 208 can effectively clean the corn stalk group stuck on the outside of the bending plate 104 and the crushing head 105 and press it down, thereby ensuring the normal operation of each component of the land preparation assembly 10 and ensuring the smooth progress of the corn stalk processing operation.

[0028] The specific implementation of this embodiment is as follows: in order to deal with the problem of corn stalks being stuck during the land preparation operation, a cleaning component 20 is specially set up. When the land preparation component 10 is used for the first time, due to the complex situation of the corn stalks, some corn stalks may be retained on the outside of the bending plate 104 and the crushing head 105, which will affect the efficiency and quality of the crushing and burying operations to a certain extent. To solve this problem, the second rotating shaft 106 is used as the power source. When the second rotating shaft 106 rotates, the first pulley 201 connected thereto rotates synchronously therewith. The first pulley 201 transmits power to the second pulley 202 through the transmission belt 203, so that the second The pulley 202 also starts to rotate, and the second pulley 202 is connected to the driving shaft 205, which in turn drives the driving shaft 205 to rotate. A swing plate 206 is provided on the outside of the driving shaft 205. As the driving shaft 205 rotates, the swing plate 206 starts to move in a circular motion. The swing plate 206 is connected to the cleaning plate 208. During the rotation of the swing plate 206, the cleaning plate 208 is driven to rotate together. During the rotation process, the cleaning plate 208 can effectively clean the corn stalks stuck on the outside of the bending plate 104 and the crushing head 105 and press them down, thereby ensuring the normal operation of each component of the land preparation assembly 10 and ensuring the smooth progress of the corn stalk processing operation.

[0029] Example 3 See also Figures 1-8 The present invention provides a technical solution: a combined land preparation machine for returning all corn straw to the field. The present invention makes corresponding improvements to the technical problems mentioned in the background technology.

[0030] As a further definition of the soil turning assembly 30 of the present invention, the soil turning assembly 30 includes a connecting rod 301 fixedly arranged on the side of the fixing frame 3, one end of the connecting rod 301 is fixedly connected to a first connecting ring 3011, and the other end of the connecting rod 301 is fixedly connected to a second connecting ring 302, the first connecting ring 3011 is rotatably sleeved on the outside of the fixing frame 3, the inside of the second connecting ring 302 is rotatably connected to a support column 303, and the outside of the support column 303 is fixedly connected to two second soil turning wheels 304, the second soil turning wheel 304 includes a turntable and a soil turning piece, and the turntable is sleeved on the support column 303. On the outside of the turntable, several turning pieces are fixedly connected to the outside of the turntable, and second limiting plates 305 are fixedly connected on both sides of the second turning wheel 304. The second turning wheel 304 is a key part of the turning assembly 30. When the excavator or tire 4 passes through the land and compacts it, the second turning wheel 304 can turn over the compacted land in time. By turning over the compacted soil, the tight structure of the soil can be broken, the porosity and air permeability of the soil can be increased, and the seeds can be fully in contact with the soil, which avoids the situation where the seeds are not in contact with the soil due to compacted soil.

[0031] The specific implementation of this embodiment is as follows: during the land preparation process, the movement of the excavator will inevitably cause compaction of the land. The compacted soil structure becomes tight and the porosity decreases, which will have many adverse effects on subsequent sowing and crop growth. In order to effectively solve this problem, a soil turning component 30 is specially provided, wherein the second soil turning wheel 304 is a key part of the soil turning component 30. When the excavator or the tire 4 passes through the land and compacts it, the second soil turning wheel 304 can turn over the compacted land in time. By turning over the compacted soil, the tight structure of the soil can be broken, the porosity and air permeability of the soil can be increased, and the seeds can be fully in contact with the soil, which avoids the situation where the seeds are not in contact with the soil due to compacted soil, thereby providing good conditions for seed germination and emergence. In addition, returning straw to the field itself may cause the problem of missing seedlings and broken ridges, and the treatment of compacted soil by the soil turning component 30 helps to alleviate this situation, ensure the emergence rate and growth quality of crops after sowing, and lay a solid foundation for the stability and efficiency of agricultural production.

[0032] It should be noted that, in this document, relational terms such as first and second, etc., are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "comprises," "comprising," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that includes a list of elements includes not only those elements but also other elements not explicitly listed, or elements inherent to such process, method, article, or apparatus.

[0033] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. A corn straw full-returning combined land preparation machine, comprising a mounting frame (1), characterized in that: An articulated frame (2) is rotatably provided inside the mounting frame (1), a fixed frame (3) is further provided inside the mounting frame (1), tires (4) are rotatably provided on both sides of the fixed frame (3), a ground leveling assembly (10) is provided inside the mounting frame (1), a cleaning assembly (20) is provided on the side of the mounting frame (1), a soil turning assembly (30) is provided on the side of the fixed frame (3), and the ground leveling assembly (10) and the cleaning assembly (20) are arranged in a linkage manner; The land preparation component (10) is used for crushing and returning corn stalks to the field; The cleaning component (20) is used to clean the straw remaining on the land preparation component (10); The cleaning assembly (20) is used to turn over the land compacted by the tire (4).

2. The combined land preparation machine for returning all corn straw to the field according to claim 1, characterized in that: The ground leveling assembly (10) comprises a first rotating shaft (101) fixedly connected to the side of the mounting frame (1), a pressing roller (102) is rotatably sleeved on the outer side of the first rotating shaft (101), and a plurality of notches (1021) are provided on the surface of the pressing roller (102).

3. The combined land preparation machine for returning all corn straw to the field according to claim 2, characterized in that: The bottom surface of the articulated frame (2) is fixedly connected to a support frame (103), the side surfaces of the support frame (103) are fixedly connected to a plurality of curved plates (104), and the ends of the curved plates (104) are fixedly connected to a crushing head (105).

4. The combined land preparation machine for returning all corn straw to the field according to claim 1, characterized in that: The side of the mounting frame (1) is also rotatably connected to a second rotating shaft (106), the outer side of the second rotating shaft (106) is fixedly connected to a plurality of first tilling wheels (107), and the side of the first tilling wheel (107) is fixedly connected to a plurality of tilling blocks (108).

5. The combined land preparation machine for returning all corn straw to the field according to claim 1, characterized in that: A transverse plate (109) is fixedly connected to the side of the mounting frame (1), and a soil leveling tooth plate (110) is connected to the bottom surface of the transverse plate (109).

6. The combined land preparation machine for returning all corn straw to the field according to claim 4, characterized in that: Two cleaning assemblies (20) are provided, and the two ground leveling assemblies (10) are respectively provided on both sides of the mounting frame (1). The cleaning assembly (20) comprises a first pulley (201) fixedly connected to the end of the second rotating shaft (106), and a second pulley (202) is rotatably connected to the side of the mounting frame (1). A transmission belt (203) is provided on the outer sides of the first pulley (201) and the second pulley (202).

7. The combined land preparation machine for returning all corn straw to the field according to claim 6, characterized in that: A first limiting disk (204) is fixedly sleeved on the outer sides of the first pulley (201) and the second pulley (202); a driving shaft (205) is fixedly connected to the side of the second pulley (202); and a swing plate (206) is fixedly connected to the outer side of the driving shaft (205).

8. The combined land preparation machine for returning all corn straw to the field according to claim 7, characterized in that: A plurality of cleaning columns (207) are fixedly connected to the top of the swing plate (206), and a cleaning plate (208) is fixedly connected to the side of the swing plate (206).

9. The combined land preparation machine for returning all corn straw to the field according to claim 1, characterized in that: The soil turning assembly (30) comprises a connecting rod (301) fixedly arranged on the side of the fixing frame (3), one end of the connecting rod (301) is fixedly connected to a first connecting ring (3011), and the other end of the connecting rod (301) is fixedly connected to a second connecting ring (302), the first connecting ring (3011) is rotatably sleeved on the outside of the fixing frame (3), and the inside of the second connecting ring (302) is rotatably connected to a support column (303).

10. The combined land preparation machine for returning all corn straw to the field according to claim 9, characterized in that: Two second tilling wheels (304) are fixedly connected to the outside of the support column (303), and second limiting plates (305) are fixedly connected to both sides of the second tilling wheels (304).

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