Farmland close-to-ground stalk carbonization equipment

Abstract

The invention provides farmland close-to-ground stalk carbonization equipment which comprises a movable shell and a fixed shell, the movable shell and the fixed shell are vertically stacked and slidably arranged, a combustion device, two rotary tillage mechanisms and a rolling mechanism are sequentially arranged below the movable shell and the fixed shell, and each rotary tillage mechanism comprises a first rotating shaft; a plurality of cutters are fixedly connected to the side wall of the first rotating shaft, a second rotating shaft is arranged in the first rotating shaft in an extending mode, a spline is fixedly connected to one end of the second rotating shaft, the spline is arranged in the first rotating shaft in a sliding fit mode, and the first rotating shaft of one rotary tillage mechanism is rotationally matched with the fixing shell. A second rotating shaft of the other rotary tillage mechanism is rotationally matched with the fixing shell, the rolling mechanism comprises an outer sleeve, a telescopic sleeve is arranged in the outer sleeve in an extending mode, and a balance weight roller is fixedly connected into the outer sleeve. According to the invention, the width can be changed, and the carbonization area is increased.

Description

Technical Field

[0001] The present invention relates to the technical field of agricultural machinery, and in particular to a farmland ground-hugging stalk carbonization device. Background Art

[0002] Straw is the general term for the stems, leaves (ears) of mature crops. When the crops are mature and harvested, for example, rice and wheat, the harvester cuts the crops at a height of 10-15 cm from the ground and then sends them into the interior for threshing and screening. The remaining straw part is generally released back to the field by chopping. Since directly burning straw will cause air pollution, if it is discarded, it will not only provide a breeding space for disease insects, but also the fertilizer and water generated during the decomposition of straw will cause pollution. Further, when cultivating the next crop, the straw also increases the operation difficulty of the tillage equipment.

[0003] In order to improve the economic value of straw and reduce the harm to the fields, the straw is collected by equipment such as a hay rake and a baler. However, fields with small areas and elevation differences generally do not meet the operation requirements of equipment such as hay rakes and balers. In addition, after the straw is collected, the root stumps remaining in the fields will also cause problems such as pests and diseases. After the straw is recycled, the organic matter in the soil decreases, and the nutrients in the straw cannot return to the soil, resulting in soil infertility. Furthermore, it is necessary to increase the application amount of chemical fertilizers, which will lead to serious soil compaction problems. The patent CN202410169793.3 proposes a mobile straw field burning and carbonization returning machine, which can burn the straw under smokeless emission and send the generated ash back to the field to solve the straw problem and fertilize the soil. However, in this solution, the root stumps cannot be processed. Summary of the Invention

[0004] To solve the above problems, the present invention discloses a farmland ground-hugging stalk carbonization device, including a movable shell and a fixed shell. The movable shell and the fixed shell are stacked and slidably arranged up and down, and a combustion device, a rotary tillage mechanism and a rolling mechanism are sequentially arranged below the two. When the device is in use, it is installed on an agricultural machine. Through the traction device on the agricultural machine, the combustion device on the device sprays flames to carbonize the straw in the field. Then, the rotary tillage mechanism rotates to plow the land, and at the same time, the rolling mechanism levels the ground after rotary tillage and supports the device.

[0005] There are two rotary tillage mechanisms, which include a first rotating shaft. A plurality of cutting tools are fixedly connected to the side wall of the first rotating shaft. A second rotating shaft is extendedly provided inside the first rotating shaft. A spline is fixedly connected to one end of the second rotating shaft. The spline is slidably fitted inside the first rotating shaft. A sealing sleeve is sleeved on the second rotating shaft, and the sealing sleeve is threadedly connected to the end of the first rotating shaft. The first rotating shaft of one of the rotary tillage mechanisms is rotatably fitted with the fixed shell, and the second rotating shaft of the other rotary tillage mechanism is rotatably fitted with the fixed shell. That is, during the mutual sliding of the fixed shell and the movable shell, the second rotating shaft extends out from the inside of the first rotating shaft, thereby changing the width of the device. The setting of the two rotary tillage mechanisms ensures that the fields below the fixed shell and the movable shell can be rotary tilled after the width of the device changes.

[0006] The rolling mechanism includes an outer sleeve. A telescopic sleeve is extendedly provided inside the outer sleeve. A counterweight roller is fixedly connected inside the outer sleeve. Screws are provided below both the movable shell and the fixed shell, and the screws are arranged close to the rolling mechanism. Through the structure of the telescopic sleeve and the outer sleeve, it also adapts to the change in the width of the device. The increase in the width of the device, that is, increases the carbonization area of a single operation, so the carbonization efficiency is improved. During the rotation of the rolling mechanism, the cutting edge of the screw cuts off the soil adhering to the rolling mechanism, and the volume of the cut-off soil is small, which is beneficial to subsequent planting.

[0007] Preferably, the combustion device includes a fixed frame. An electric control valve is provided inside the fixed frame. A burner is fixedly connected to the lower end of the electric control valve. The electric control valve controls the flow of fuel sent out by the burner.

[0008] Preferably, the combustion device further includes a mounting plate, and the fixed frame is fixedly connected to the mounting plate. A driving motor is fixedly connected to the side wall of the fixed frame. The output end of the driving motor is fixedly connected to the electric control valve. A second hydraulic cylinder is inserted through the end of the mounting plate. A U-shaped member is fixedly connected below the mounting plate, and the output end of the second hydraulic cylinder is fixedly connected to the U-shaped member. When the driving motor works, the inclination angle of the burner is adjusted, that is, the combustion angle is controlled. In addition, a second hydraulic cylinder is provided to control the height of the mounting plate, that is, to control the height of the burner.

[0009] Preferably, the device further includes a fuel tank, a control module and a camera. The control module is electrically connected to the camera and the electric control valve. The pipes extending from the fuel tank are all connected to the electric control valve. The fuel tank is used to store fuel, and the fuel can be of types such as gas and fuel oil. The camera here takes pictures of the ground. The built-in image recognition of the control module judges the density of the straw in the field, thereby adjusting the electric control valves, driving motors and second hydraulic cylinders in each combustion device to control the flame size, height and inclination angle, so as to control the carbonization consistency according to the density of the straw. This setting makes the device have the advantage of intelligence.

[0010] Preferably, one end of the fixed shell is fixedly connected with a connecting frame, and the camera is fixedly connected to the upper part of the connecting frame. The connecting frame is fixedly connected to the agricultural machine.

[0011] Preferably, a first hydraulic cylinder is fixedly connected inside the fixed shell, and the output end of the first hydraulic cylinder is fixedly connected to the movable shell. When the first hydraulic cylinder works, the output end extends or retracts, so as to realize the mutual sliding of the movable shell and the fixed shell, and the increase or decrease of the width of the device.

[0012] Preferably, a sliding groove is arranged on the upper part of the fixed shell, and a sliding block is fixedly connected to the lower end of the movable shell, and the sliding block is slidably matched in the sliding groove. Through the arrangement of the sliding groove and the sliding block, the connection strength between the two is improved. At the same time, a rib plate is arranged at the upper end of the movable shell, thereby further improving the structural strength of the movable shell.

[0013] Preferably, a transmission box is fixedly connected to one side of the fixed shell. A chain and a sprocket are arranged inside the transmission box to provide power for the rotary tillage mechanism. In addition, a structure for power connection with the agricultural machine is arranged at the end of the fixed shell.

[0014] A method for carbonizing ground stalks includes the following contents: Step 1: Use a thin shell member to cover the plot and form a relatively enclosed space to reduce the leakage of flue gas; Step 2: Take pictures of the field, obtain the density of the straw through image recognition, and divide it into grade d 杆 , further judge whether there is water at the root of the straw and divide it into grade d 水 , and obtain the current working time and air humidity through networking. Here, a time threshold selection table F 时 , and air humidity H 湿 are set. It should be noted that the value ranges of d 水 , F 时 , H 湿 are not less than 0 and not greater than 1, that is, the distribution of the straw is obtained through image recognition; Step 3: The orientation of the combustion device is opposite to the advancing direction of the thin shell member, the depression angle of the combustion device is 15°-45°, and the fuel delivery amount Q of the combustion device is obtained according to the following formula: Q = Q1 + [- (d 杆 + a) 2 + c] * (1 + d 水 + F 时 + H 湿 ), where Q1 is the fuel delivery amount that keeps the combustion when the combustion device is not working, and a and c are both set constants. According to the density and humidity of the straw, etc., ensure that the straw is fully carbonized and the least amount of fuel is used; Step 4: Conduct rotary tillage on the carbonized area. During the rotary tillage process, the soil lifted absorbs and mixes with the smoke in the air, thereby reducing the dispersion of the smoke. In addition, after rotary tillage, it can prevent the ignition of untreated straw and the "dust raising" of the inorganic substances after combustion.

[0015] The beneficial effects of the present invention are as follows: 1. The present invention is provided with a movable shell and a fixed shell that slide relative to each other, which can change the width of the device, thereby increasing the area of carbonization treatment in a single stroke. Moreover, by burning close to the ground, the root stumps can be carbonized together.

[0016] 2. The device directly sprays flames onto the ground for carbonization treatment, which can greatly simplify the carbonization process and directly carbonize the straw at the roots of crops. In addition, the settings of the movable shell, fixed shell, and rotary tillage mechanism greatly reduce the amount of smoke dispersion.

[0017] 3. Multiple burner nozzles are provided, and each burner nozzle can independently adjust the flame size, the inclination angle of the flame, and the height of the burner nozzle. Combined with a camera, a control module, etc., it can ensure energy conservation while guaranteeing the consistency of carbonization quality.

[0018] 4. The device is an independent module and can be installed on agricultural machinery for use without the need to customize mechanisms such as walking and power. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 is a three-dimensional schematic diagram of the present invention; Figure 2 is a bottom schematic diagram of the present invention; Figure 3 is a schematic diagram of the rotary tillage mechanism of the present invention; Figure 4 is Figure 3 an enlarged view of part A in Figure 5 is a cross-sectional schematic diagram of the rolling mechanism of the present invention; Figure 6 is a schematic diagram of the combustion system of the present invention; Figure 7 is a partial schematic diagram of the combustion device of the present invention; Figure 8 is a schematic diagram of the carbonization method of the present invention.

[0020] LIST OF REFERENCE NUMERALS: 1. Rolling mechanism; 2. Movable shell; 3. Fixed shell; 4. Transmission box; 5. Connecting frame; 6. Camera; 7. Combustion device; 8. Chute; 9. Rotary tillage mechanism; 10. First hydraulic cylinder; 11. Slide block; 12. Fuel tank; 13. Control module; 14. Screw; 101. Telescopic sleeve; 102. Outer sleeve; 103. Counterweight roller; 701. Burner; 702. Fixed frame; 703. Electric control valve; 704. Mounting plate; 705. Driving motor; 706. U-shaped part; 707. Second hydraulic cylinder; 901. Tool; 902. First rotating shaft; 903. Second rotating shaft; 904. Sealing sleeve; 905. Spline. Detailed implementation manners

[0021] The following further clarifies the present invention in conjunction with the accompanying drawings and specific implementation manners. It should be understood that the following specific implementation manners are only used to illustrate the present invention and not to limit the scope of the present invention. It should be noted that the words "front", "rear", "left", "right", "up" and "down" used in the following description refer to the directions in the drawings, and the words "inner" and "outer" respectively refer to the directions towards or away from the geometric center of a specific component. Embodiment 1

[0022] As Figures 1 to 7 shown, a farmland ground-hugging stalk carbonization device includes a movable housing 2 and a fixed housing 3. The movable housing 2 and the fixed housing 3 are stacked and slidably arranged up and down, and a combustion device 7, a rotary tillage mechanism 9 and a rolling mechanism 1 are sequentially arranged below the two. When the device is in use, the device is installed at the rear end of an agricultural machine. Through the traction and power transmission of the agricultural machine, the combustion device 7 on the device first carbonizes the ground, then performs rotary tillage, and finally the rolling mechanism 1 levels the rotary-tilled ground and provides a supporting effect for the device at the same time.

[0023] There are two rotary tillage mechanisms 9, and each includes a first rotating shaft 902. A plurality of tools 901 are fixedly connected to the side wall of the first rotating shaft 902. During the rotation of the rotary tillage mechanism 9, the tools 901 move along, break up the farmland, and mix the carbonized straw and soil. A second rotating shaft 903 extends inside the first rotating shaft 902. One end of the second rotating shaft 903 is fixedly connected with a spline 905. The spline 905 is slidably fitted inside the first rotating shaft 902. That is, during the mutual sliding of the movable housing 2 and the fixed housing 3, in order to ensure that both ends of the rotary tillage mechanism 9 are supported, a structure in which the first rotating shaft 902 and the second rotating shaft 903 are nested with each other is provided, which can adapt to the change of the positions of the movable housing 2 and the fixed housing 3. A sealing sleeve 904 is sleeved on the second rotating shaft 903, and the sealing sleeve 904 is threadedly connected to the end of the first rotating shaft 902. The first rotating shaft 902 of one rotary tillage mechanism 9 is rotationally fitted with the fixed housing 3, and the second rotating shaft 903 of the other rotary tillage mechanism 9 is rotationally fitted with the fixed housing 3. That is, the installation directions of the two rotary tillage mechanisms 9 are opposite, and during the change of the positions of the movable housing 2 and the fixed housing 3, it can be ensured that the farmland below can be rotary tilled.

[0024] The rolling mechanism 1 includes an outer sleeve 102. An expansion sleeve 101 is arranged to extend inside the outer sleeve 102, and a counterweight roller 103 is fixedly connected inside the outer sleeve 102. The rolling mechanism 1 provides support for the device and ensures the smoothness of the soil after rotary tillage. In addition, the structure of the expansion sleeve 101 and the outer sleeve 102 provided by the rolling mechanism 1 also adapts to the width change of the device. Screw rods 14 are arranged below both the movable shell 2 and the fixed shell 3, and the screw rods 14 are arranged close to the rolling mechanism 1. The structure of the screw rods 14 is similar to that of the feeding screw rod. When the rolling mechanism 1 is rolling and operating, if the water content in the field is high, the soil will adhere to the rolling mechanism 1. The screw rods 14 arranged here will refine and cut off the soil adhering to the rolling mechanism 1. In the existing treatment methods, most use a shovel plate to shovel it off, and the fallen soil blocks are relatively large, which is not conducive to subsequent farming.

[0025] The combustion device 7 includes a fixed frame 702. The fixed frame 702 is integrally U-shaped and is formed by bending sheet metal for connection and fixation. An electric control valve 703 is arranged inside the fixed frame 702. A combustion nozzle 701 is fixedly connected to the lower end of the electric control valve 703. At least 15 combustion nozzles 701 are provided and are independently controlled. Fuel enters the combustion nozzle 701 through the electric control valve 702, and the combustion nozzle 701 sprays out flames to carbonize the straw.

[0026] The combustion device 7 further includes a mounting plate 704, and the fixed frame 702 is fixedly connected to the mounting plate 704. A driving motor 705 is fixedly connected to the side wall of the fixed frame 702. The output end of the driving motor 705 is fixedly connected to the electric control valve 703. That is, when the driving motor 705 is started, the inclination angle of the combustion nozzle 701 can be adjusted. A second hydraulic cylinder 707 is inserted through the end of the mounting plate 704. A U-shaped member 706 is fixedly connected below the mounting plate 704, and the output end of the second hydraulic cylinder 707 is fixedly connected to the U-shaped member 706. When the second hydraulic cylinder 707 works, the height of the mounting plate 704 is adjusted to set the height of the combustion nozzle 701.

[0027] Since this device is mainly used for carbonizing straw, the rotary tillage mechanism 9 will incidentally bury the carbonized straw into the soil to avoid generating open flames, and the width of the device can be changed, which is beneficial to improving the carbonization efficiency.

[0028] The device further includes a fuel tank 12, a control module 13 and a camera 6. The control module 13 is electrically connected to the camera 6 and the electric control valve 703. The pipes extending from the fuel tank 12 are all connected to the electric control valve 703. Fuel is stored in the fuel tank 12. By controlling the electric control valve 703, the fuel is sent to the combustion nozzle 701. In addition, an image recognition function is set in the control module 13. The density of the straw in the field is obtained through the camera 6, so as to control the flame size, inclination angle and height of each combustion nozzle 701, that is, intelligent operation, ensuring uniform carbonization while reducing fuel consumption.

[0029] One end of the fixed housing 3 is fixedly connected to a connecting frame 5. The device is fixedly connected to agricultural machinery through the connecting frame 5, and the camera 6 is fixedly connected to the upper part of the connecting frame 5.

[0030] A first hydraulic cylinder 10 is fixedly connected inside the fixed housing 3. The output end of the first hydraulic cylinder 10 is fixedly connected to the movable housing 2. Starting the first hydraulic cylinder 10, its output end extends or retracts, realizing the mutual sliding of the movable housing 2 and the fixed housing 3, so that the width of the device increases or decreases.

[0031] A chute 8 is arranged on the upper part of the fixed housing 3. The lower end of the movable housing 2 is fixedly connected with a slider 11, and the slider 11 is slidably fitted in the chute 8. The cooperation of the chute 8 and the slider 11 ensures the connection strength between the movable housing 2 and the fixed housing 3. Further, a plurality of rib plates are fixedly connected to the upper end of the movable housing 2, greatly improving the structural strength of the movable housing 2.

[0032] Further, the screw rod 14 located below the movable housing 2 and the end of the combustion device 7 are both arranged on the sliding block 11.

[0033] A transmission box 4 is fixedly connected to one side of the fixed housing 3. A sprocket and a chain are arranged inside the transmission box 4. In addition, a transmission connection structure is arranged at the end of the fixed housing 3. Through this structure, it is connected to agricultural machinery, and with the transmission of the sprocket and the chain, two rotary tillage mechanisms 9 are driven to rotate. Embodiment 2

[0034] As Figure 8 shown, a method for carbonizing ground stalks includes the following contents: Step 1: Use a thin shell member to cover the plot. The shelling member is the movable housing 2 and the fixed housing 3 described in Embodiment 1, and a relatively enclosed space is formed. Specifically, it is enclosed on both sides, and the two sides in the advancing direction are open, facilitating the straw to enter the inside of the thin shell member; Step 2: Take pictures of the field, and obtain the density of the straw through image recognition and divide it into grade d 杆 , this grade is artificially divided, and each grade corresponds to a parameter. Further, it is judged whether there is water at the root of the straw and divided into grade d 水 . Similarly, the grade of straw density and the grade of whether there is water are also artificially divided. After being recognized by the image recognition algorithm, the corresponding d 杆 , d 水 are given, and the current operation time and air humidity are obtained through networking. Here, a time threshold selection table F 时 is set, which is obtained through the statistical analysis of the humidity changes in the area over the years. The corresponding thresholds are set from the perspectives of season and solar altitude, as well as the air humidity H 湿, of course, the carbonization equipment is preset with temperature and humidity sensors, and the data of the temperature and humidity sensors can also be directly used. Note that d 水 , F 时 , H 湿 The value range of is not less than 0 and not greater than 1; Step 3: The orientation of the combustion device 7 is opposite to the advancing direction of the thin shell part. The depression angle of the combustion device 7 is 15°-45°. During the carbonization process, the fireworks and flue gas can be blown towards the end of the advancing thin shell part. The fuel delivery volume Q of the combustion device 7 is obtained according to the following formula: Q = Q1+[- (d 杆 +a) 2 +c]*(1 + d 水 +F 时 +H 湿 ), where Q1 is the fuel delivery volume for maintaining combustion when the combustion device 7 is not working, and a and c are both set constants. Note that each combustion device 7 is independently controlled. In addition, the height of the burner 701 will be changed and can be used for straws at different heights; In the above formula, it is shown that as the amount of straw increases, the fuel delivery volume Q first increases and then decreases. This is because the more straw there is, the more heat can be generated by its own combustion, and at this time, the use of fuel can be reduced. In addition, under the compensation of parameters such as humidity, specifically, the greater the humidity of the straw, the more the fuel delivery volume Q; Step 4: Perform rotary tillage treatment on the area after carbonization treatment. The flue gas blown towards the end of the advancing thin shell part is adsorbed and mixed during the rotary tillage process, reducing the escape of the flue gas.

[0035] The technical means disclosed in the solution of the present invention are not limited to the technical means disclosed in the above embodiments, but also include technical solutions composed of any combination of the above technical features.

Claims

1. An agricultural field ground-hugging stalk carbonization device, characterized in that, It includes a movable housing (2) and a fixed housing (3). The movable housing (2) and the fixed housing (3) are slidably arranged in an up-and-down stacked manner, and a combustion device (7), a rotary tillage mechanism (9), and a rolling mechanism (1) are successively arranged below the two; There are two rotary tillage mechanisms (9), and each includes a first rotating shaft (902). A plurality of cutting tools (901) are fixedly connected to the side wall of the first rotating shaft (902). A second rotating shaft (903) extends inside the first rotating shaft (902). One end of the second rotating shaft (903) is fixedly connected with a spline (905). The spline (905) is slidably fitted inside the first rotating shaft (902). A sealing sleeve (904) is sleeved on the second rotating shaft (903), and the sealing sleeve (904) is threadedly connected to the end of the first rotating shaft (902). The first rotating shaft (902) of one of the rotary tillage mechanisms (9) is rotationally fitted with the fixed housing (3), and the second rotating shaft (903) of the other rotary tillage mechanism (9) is rotationally fitted with the fixed housing (3); The rolling mechanism (1) includes an outer sleeve (102). A telescopic sleeve (101) extends inside the outer sleeve (102). A counterweight roller (103) is fixedly connected inside the outer sleeve (102). Screws (14) are arranged below both the movable housing (2) and the fixed housing (3), and the screws (14) are arranged adjacent to the rolling mechanism (1).

2. The ground-hugging stalk carbonization equipment for farmland according to claim 1, characterized in that: The combustion device (7) includes a fixed frame (702). An electric control valve (703) is arranged inside the fixed frame (702). A combustion nozzle (701) is fixedly connected to the lower end of the electric control valve (703).

3. The ground-hugging stalk carbonization equipment for farmland according to claim 2, characterized in that: The combustion device (7) further includes a mounting plate (704). The fixed frame (702) is fixedly connected to the mounting plate (704). A driving motor (705) is fixedly connected to the side wall of the fixed frame (702). The output end of the driving motor (705) is fixedly connected to the electric control valve (703). A second hydraulic cylinder (707) is inserted through the end of the mounting plate (704). A U-shaped member (706) is fixedly connected below the mounting plate (704), and the output end of the second hydraulic cylinder (707) is fixedly connected to the U-shaped member (706).

4. The ground-hugging stalk carbonization equipment for farmland according to claim 2, characterized in that: The device further includes a fuel tank (12), a control module (13), and a camera (6). The control module (13) is electrically connected to the camera (6) and the electric control valve (703). The pipes extending from the fuel tank (12) are all connected to the electric control valve (703).

5. The ground-hugging stalk carbonization equipment for farmland according to claim 4, characterized in that: One end of the fixed housing (3) is fixedly connected with a connecting frame (5). The camera (6) is fixedly connected to the upper part of the connecting frame (5).

6. The ground-hugging stalk carbonization equipment for farmland according to claim 1, characterized in that: A first hydraulic cylinder (10) is fixedly connected inside the fixed housing (3). The output end of the first hydraulic cylinder (10) is fixedly connected to the movable housing (2).

7. The ground-hugging stalk carbonization equipment for farmland according to claim 1, characterized in that: A chute (8) is arranged on the upper part of the fixed housing (3). A slider (11) is fixedly connected to the lower end of the movable housing (2), and the slider (11) is slidably fitted in the chute (8).

8. The ground-hugging stalk carbonization equipment for farmland according to claim 1, characterized in that: A transmission box (4) is fixedly connected to one side of the fixed housing (3).

9. A method for carbonizing stems close to the ground, according to the equipment for carbonizing stems close to the ground according to any one of claims 1 to 8, characterized in that: It includes the following contents: Step 1: Cover the plot with a thin-shell component to form a relatively enclosed space; Step 2: Take pictures of the field, obtain the density of the straw through image recognition, and divide it into grades d 杆 , further determine whether there is water at the root of the straw and divide it into grades d 水 , and obtain the current working time and air humidity through networking. Here, set the time threshold to select Table F 时 , and air humidity H 湿 , note that d 水 、F 时 、H 湿 take values not less than 0 and not greater than 1; Step 3: The orientation of the combustion device (7) is opposite to the advancing direction of the thin shell member. The depression angle of the combustion device (7) is 15°-45°. The fuel delivery rate Q of the combustion device (7) is obtained according to the following formula: Q = Q1 + [- (d 杆 + a) 2 + c] * (1 + d 水 + F 时 + H 湿 ), where Q1 is the fuel delivery rate for maintaining combustion when the combustion device (7) is not working, and a and c are both set constants; Step 4: Carry out rotary tillage on the carbonized area.

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