Straw returning rotary cultivator

Abstract

The present application relates to the technical field of straw rotary tillage and returning machine, and discloses a straw rotary tillage and returning machine, which comprises a main frame, a straw rolling assembly is arranged in the inner cavity of the main frame, a pesticide discharging assembly is arranged on the top of the main frame, a gearbox is arranged on the top of the main frame, and a rotary tillage knife is arranged on the power output shaft of the gearbox; the straw rolling assembly comprises a straw cutting mechanism, and a cutter adjusting mechanism is arranged in the inner cavity of the straw cutting mechanism; the connecting shaft, the rotating shaft and the cutter are rolled on the soil under the action of the moving force of the main frame, the cutter can cut the straw into the soil when rolling, then the rotary tillage knife is used for rotary tillage on the soil, the straw and the pesticide, so that the soil, the straw and the pesticide are fully mixed and returned to the field, the straw on the surface of the soil is reduced, the straw loss is reduced, and the problem that the straw cannot be fully buried in the soil when the straw is returned to the field by using the existing rotary tillage machine, so that a large amount of straw is left on the surface of the soil after rotary tillage is solved.

Description

Technical Field

[0001] This invention relates to the field of straw rotary tillage and returning machine technology, specifically a straw returning rotary tillage machine. Background Technology

[0002] Returning straw to the field is a method of improving soil fertility and increasing yields, widely valued globally. It eliminates air pollution caused by straw burning while simultaneously increasing soil fertility and productivity. Returning straw to the field increases soil organic matter, improves soil structure, loosens the soil, increases porosity, reduces bulk density, and promotes microbial activity and crop root development. The effect of returning straw to the field on increasing fertility and yield is significant, generally increasing yields by 5% to 10%. However, improper methods can also lead to increased soil pathogens, aggravated crop diseases, and seedling loss. Therefore, adopting reasonable straw returning methods is crucial to achieving good results.

[0003] After harvesting, a large amount of straw remains in the field. The cut straw can be recycled, but the straw in the soil needs to be rotary tilled back into the field. When using existing rotary tillers, the straw cannot be fully buried in the soil, resulting in a large amount of straw remaining on the soil surface after rotary tilling. These straws contain pests, and even after rotary tilling, some live insects remain in the soil. Therefore, crop seeds need to be treated with insecticides before planting, which increases planting costs. Summary of the Invention

[0004] This invention provides a straw-returning rotary tiller, which solves the problems mentioned in the background art.

[0005] The present invention provides the following technical solution: a straw return rotary tiller, comprising a main frame, a straw crushing component provided in the inner cavity of the main frame, an insecticide dispensing component installed on the top of the main frame, a gearbox installed on the top of the main frame, and rotary tillage blades installed on the power output shaft of the gearbox;

[0006] The straw crushing assembly includes a straw cutting mechanism, and the inner cavity of the straw cutting mechanism is equipped with a blade adjustment mechanism.

[0007] The straw cutting mechanism includes a rotating shaft, the outer wall of which has several T-shaped grooves, the inner wall of which has several cutters, and a cutter adjustment mechanism between each cutter. The inner wall of the rotating shaft has a connecting shaft, which is movably connected to the main frame.

[0008] The insecticide dispensing assembly includes an insecticide dispensing power mechanism, and the top of the insecticide dispensing power mechanism is provided with an insecticide dispensing switch mechanism.

[0009] The insecticide dispensing switch mechanism includes an insecticide placement box, a dispensing guide cylinder installed at the bottom of the insecticide placement box, a switch plate slidably connected to the inner wall of the dispensing guide cylinder, a top lifting plate installed at the top of the switch plate, lifting rods installed at the bottom of both ends of the top lifting plate, and contact plates installed at the bottom of the lifting rods.

[0010] As a preferred embodiment of the present invention, anti-detachment discs are installed at both ends of the rotating shaft, and anti-detachment blocks are fixedly assembled on the outer edge of the anti-detachment discs, with the anti-detachment blocks inserted into the T-shaped grooves.

[0011] As a preferred embodiment of the present invention, the tool adjustment mechanism includes a fixed block, a screw is fixedly mounted on the outer edge of the fixed block, and a movable block is threadedly connected to the outer edge of the screw.

[0012] As a preferred embodiment of the present invention, the outer edge of the movable block is provided with an annular groove, and a protective sleeve is movably sleeved on the inner wall of the annular groove, and the protective sleeve is fixedly assembled on the fixed block.

[0013] As a preferred embodiment of the present invention, the insecticide dispensing power mechanism includes a rotating disk, a plurality of mounting brackets are installed on the outer wall of the rotating disk, a connecting pin is installed on the inner wall of the mounting bracket, and a top shaft is movably sleeved on the outer edge of the connecting pin.

[0014] As a preferred embodiment of the present invention, the rotating disk is mounted on the connecting shaft, and rotating disks are mounted on both ends of the connecting shaft.

[0015] As a preferred embodiment of the present invention, the outer edge of the lifting rod is movably connected to a limiting block, the limiting block is installed on the insecticide placement box, and the included angle between the limiting block and the contact plate is 45°.

[0016] As a preferred embodiment of the present invention, a tension spring is fixedly mounted on the top of the limiting block, and the top of the tension spring is fixedly mounted on the bottom of the top lifting plate.

[0017] As a preferred embodiment of the present invention, a straw pressing guide plate is fixedly mounted at the bottom of the main frame, a straw pressing roller is installed at the bottom of the straw pressing guide plate, and the straw pressing guide plate is located at the front end of the straw cutting mechanism.

[0018] As a preferred embodiment of the present invention, the bottom of the drug dispensing guide tube is provided with a central guide plate, which is mounted on the main frame and is arc-shaped.

[0019] The present invention has the following beneficial effects:

[0020] 1. This straw-returning rotary tiller uses the force of the main frame's movement to drive the connecting shaft, rotating shaft, and cutter to roll on the soil. As the cutter rolls, it can cut the straw into the soil. Subsequently, the rotary tiller blades tillage the soil, straw, and pesticide, ensuring that the soil, straw, and pesticide are fully mixed and returned to the field. This reduces the amount of straw on the soil surface and minimizes straw loss, thus solving the problem that existing rotary tillers cannot fully bury the straw in the soil when returning it to the field, resulting in a large amount of straw remaining on the soil surface after rotary tillage.

[0021] 2. This straw-returning rotary tiller uses an insecticide placement box located above the main frame. The insecticide in the box slides down through a discharge guide tube, is guided by a central guide plate to a straw-pressing guide plate, and then further guided onto the soil and into the grooves cut by the blades. The rotary tiller then mixes the straw, insecticide, and soil by rotating the blades. This ensures thorough contact between the insecticide and the straw, eliminating pests and solving the problem of pests remaining inside the straw even after being rotary tilled into the soil. This eliminates the need for pest treatment before planting crops, which increases planting costs.

[0022] 3. This straw-returning rotary tiller drives the rotating disc, mounting bracket, connecting pin, and top shaft to rotate through the rotation of the connecting shaft. When the top shaft rotates, it intermittently contacts the contact plate. As the top shaft rotates, it gradually moves the contact plate, lifting rod, top lifting plate, and switch plate upward. The upward movement of the switch plate connects the pesticide discharge guide tube with the insecticide placement box. At this time, the insecticide can be discharged through the pesticide discharge guide tube. The insecticide discharge of this device is achieved by the rolling force of the straw crushing component, which does not require an independent power source and reduces energy consumption. Attached Figure Description

[0023] Figure 1 This is a frontal perspective view of the present invention;

[0024] Figure 2 This is a three-dimensional structural diagram of the back of the present invention;

[0025] Figure 3 This is a schematic diagram of the bottom three-dimensional structure of the present invention;

[0026] Figure 4 This is a schematic diagram of the cross-sectional structure of the present invention;

[0027] Figure 5 For the present invention Figure 4 Enlarged structural diagram at point A in the diagram;

[0028] Figure 6 For the present invention Figure 4 Enlarged structural diagram at point B in the diagram;

[0029] Figure 7 This is a schematic diagram of the straw crushing component and the insecticide dispensing power mechanism of the present invention;

[0030] Figure 8 For the present invention Figure 7 Enlarged structural diagram at point C;

[0031] Figure 9 This is a schematic diagram of the unfolded structure of the straw cutting mechanism of the present invention;

[0032] Figure 10 This is a schematic diagram of the tool adjustment mechanism of the present invention.

[0033] In the diagram: 1. Main frame; 2. Straw compaction assembly; 3. Pesticide dispensing assembly; 4. Gearbox; 5. Rotary tillage blades;

[0034] 21. Straw cutting mechanism; 22. Blade adjustment mechanism; 23. Straw pressing guide plate; 24. Straw pressing roller;

[0035] 31. Insecticide dispensing power mechanism; 32. Insecticide dispensing switch mechanism;

[0036] 2101. Rotating shaft; 2102. T-slot; 2103. Cutter; 2104. Anti-detachment disc; 2105. Anti-detachment block; 2106. Connecting shaft;

[0037] 2201. Fixed block; 2202. Screw; 2203. Protective sleeve; 2204. Moving block; 2205. Annular groove;

[0038] 3101. Rotary disk; 3102. Mounting bracket; 3103. Connecting pin; 3104. Top shaft;

[0039] 3201 Insecticide placement box; 3202 Insecticide dispensing guide tube; 3203 Central guide plate; 3204 Switch plate; 3205 Top lifting plate; 3206 Lifting rod; 3207 Contact plate; 3208 Limit block; 3209 Tension spring. Detailed Implementation

[0040] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0041] Please see Figures 1-10A straw-returning rotary tiller includes a main frame 1, a straw crushing component 2 in the inner cavity of the main frame 1, an insecticide dispensing component 3 installed on the top of the main frame 1, a gearbox 4 installed on the top of the main frame 1, and rotary tillage blades 5 installed on the power output shaft of the gearbox 4.

[0042] In the above structure, the tractor's movement drives the main frame 1 to move. When the main frame 1 moves, it drives the straw compaction assembly 2, the pesticide dispensing assembly 3, the gearbox 4, and the rotary tiller blades 5 to move as well. The straw compaction assembly 2 cuts the straw into the soil, and at the same time, the movement of the straw compaction assembly 2 releases the pesticide from the pesticide dispensing assembly 3, so that the pesticide comes into contact with the soil and straw. Then, the force of the tractor's drive shaft rotation is transmitted to the gearbox 4, which drives the rotary tiller blades 5 to rotate. The rotary tiller blades 5 tillage the soil, straw, and pesticide, gradually making the soil, straw, and pesticide fully mixed and returned to the field. The pesticide can kill insects in the soil after crushing the straw.

[0043] The straw crushing assembly 2 includes a straw cutting mechanism 21, and a blade adjustment mechanism 22 is installed in the inner cavity of the straw cutting mechanism 21.

[0044] In the above structure, when the main frame 1 is in operation, the straw cutting mechanism 21 will contact the ground. When the main frame 1 moves, the straw cutting mechanism 21 will roll on the soil. The rolling of the straw cutting mechanism 21 will cut the straw in the soil. The blade adjustment mechanism 22 is set to adjust the distance between the cutters 2103, so that the device can cut various crops into the soil, which improves the flexibility of the device.

[0045] The straw cutting mechanism 21 includes a rotating shaft 2101. The outer wall of the rotating shaft 2101 is provided with a number of T-shaped grooves 2102. The inner wall of the T-shaped grooves 2102 is provided with a number of cutters 2103. A cutter adjustment mechanism 22 is provided between each cutter 2103. A connecting shaft 2106 is installed on the inner wall of the rotating shaft 2101. The connecting shaft 2106 is movably connected to the main frame 1.

[0046] In the above structure, multiple T-shaped grooves 2102 are provided on the rotating shaft 2101 to facilitate the replacement of the cutter 2103. Since the cutter 2103 is in contact with the soil for a long time, it wears a lot. In order to improve the cutting effect, the cutter 2103 needs to be replaced regularly. Through the setting of the connecting shaft 2106, the connecting shaft 2106 is installed on the main frame 1. When the main frame 1 moves, it can drive the cutter 2103, the rotating shaft 2101 and the connecting shaft 2106 to rotate. When the rotating shaft 2101 rotates, the cutter 2103 can cut the straw into the soil.

[0047] The insecticide dispensing assembly 3 includes an insecticide dispensing power mechanism 31, and an insecticide dispensing switch mechanism 32 is provided on the top of the insecticide dispensing power mechanism 31.

[0048] In the above structure, the insecticide dispensing power mechanism 31 is configured so that the connecting shaft 2106 can drive the insecticide dispensing power mechanism 31 to rotate when it rotates. When the insecticide dispensing power mechanism 31 rotates, it can open and close the feeding port in the insecticide dispensing switch mechanism 32, so that the insecticide dispensing switch mechanism 32 can dispense intermittently. When the cutter 2103 cuts a groove in the soil, the insecticide will enter the groove. Then, the rotary tiller 5 mixes the soil, straw and insecticide, which further improves the mixing effect between the insecticide and the straw and soil, and effectively avoids the waste of insecticide.

[0049] The insecticide dispensing switch mechanism 32 includes an insecticide placement box 3201, a dispensing guide tube 3202 installed at the bottom of the insecticide placement box 3201, a switch plate 3204 slidably connected to the inner wall of the dispensing guide tube 3202, a top lifting plate 3205 installed at the top of the switch plate 3204, lifting rods 3206 installed at the bottom of both ends of the top lifting plate 3205, and a contact plate 3207 installed at the bottom of the lifting rods 3206.

[0050] In the above structure, the insecticide can be placed in the insecticide placement box 3201. The switch plate 3204 can seal the pesticide dispensing guide tube 3202, so that the insecticide in the insecticide placement box 3201 cannot enter the pesticide dispensing guide tube 3202. When the switch plate 3204 is not in the pesticide dispensing guide tube 3202, the insecticide placement box 3201 is connected to the pesticide dispensing guide tube 3202, and the insecticide in the insecticide placement box 3201 will fall downward through the pesticide dispensing guide tube 3202.

[0051] In a preferred embodiment: anti-detachment discs 2104 are installed at both ends of the rotating shaft 2101, and anti-detachment blocks 2105 are fixedly assembled on the outer edge of the anti-detachment discs 2104, and the anti-detachment blocks 2105 are inserted into the T-shaped grooves 2102.

[0052] In the above structure, by using the anti-detachment disc 2104 and the anti-detachment block 2105 together, the anti-detachment disc 2104 and the anti-detachment block 2105 can seal the T-slot 2102, so that the cutter 2103 and the cutter adjustment mechanism 22 cannot be moved out of the T-slot 2102, thereby improving the stability of the cutter 2103 and the cutter adjustment mechanism 22 during operation.

[0053] In a preferred embodiment: the tool adjustment mechanism 22 includes a fixed block 2201, a screw 2202 is fixedly mounted on the outer edge of the fixed block 2201, and a movable block 2204 is threadedly connected to the outer edge of the screw 2202.

[0054] In the above structure, the fixed block 2201, screw 2202 and movable block 2204 are used in combination. By placing the fixed block 2201, screw 2202 and movable block 2204 between the two cutters 2103, the two cutters 2103 can be separated. The cutters 2103 correspond to the straw in the field. When the position of the cutter 2103 needs to be adjusted, it can be adjusted by rotating the annular groove 2205 clockwise and counterclockwise, which improves the flexibility of the device.

[0055] In a preferred embodiment: the outer edge of the movable block 2204 is provided with an annular groove 2205, and a protective sleeve 2203 is movably sleeved on the inner wall of the annular groove 2205. The protective sleeve 2203 is fixedly assembled on the fixed block 2201.

[0056] In the above structure, the protective sleeve 2203 can protect the screw 2202 and prevent the rotary tiller 5 from splashing soil onto the screw 2202 during operation. When a large amount of soil accumulates on the screw 2202, it will make it difficult for the screw 2202 and the movable block 2204 to rotate. The protective sleeve 2203 improves the safety of the screw 2202.

[0057] In a preferred embodiment: the insecticide dispensing power mechanism 31 includes a rotating disk 3101, a plurality of mounting brackets 3102 are installed on the outer wall of the rotating disk 3101, a connecting pin 3103 is installed on the inner wall of the mounting bracket 3102, and a top shaft 3104 is movably sleeved on the outer edge of the connecting pin 3103.

[0058] In the above structure, when the rotating disk 3101 rotates, it will drive the mounting bracket 3102, the connecting pin 3103 and the top shaft 3104 to rotate. When the rotating disk 3101 rotates, it will gradually bring the top shaft 3104 into contact with the contact plate 3207. The top shaft 3104 will cause the contact plate 3207 to move upward. The upward movement of the contact plate 3207 will drive the lifting rod 3206, the top lifting plate 3205 and the switch plate 3204 to move upward. At this time, the switch plate 3204 can prevent the pesticide guide tube 3202 from being blocked. At this time, the pesticide in the pesticide placement box 3201 can slide into the soil.

[0059] In a preferred embodiment: the rotating disk 3101 is mounted on the connecting shaft 2106, and the rotating disk 3101 is mounted on both ends of the connecting shaft 2106;

[0060] In the above structure, the rotating disk 3101, mounting bracket 3102, connecting pin 3103 and top shaft 3104 are driven to rotate by the rotation of the connecting shaft 2106. At this time, the rotating disk 3101 installed on the connecting shaft 2106 can rotate, so that the insecticide feeding on this device is achieved by the force of the rotation of the straw crushing component 2, without the need for an independent power source, and there is no energy consumption during operation.

[0061] In a preferred embodiment: the outer edge of the lifting rod 3206 is movably connected to a limiting block 3208, the limiting block 3208 is installed on the insecticide placement box 3201, and the included angle between the limiting block 3208 and the contact plate 3207 is 45°.

[0062] In the above structure, the limiting block 3208 can limit the lifting rod 3206, so that the lifting rod 3206 always remains in a vertical state when moving up and down, which improves the stability of the lifting rod 3206 moving up and down. By setting the contact plate 3207 in an inclined state, the top shaft 3104 first contacts the head of the contact plate 3207, gradually making the contact plate 3207 move upward, and then the top shaft 3104 disengages from the tail of the contact plate 3207.

[0063] In a preferred embodiment: a tension spring 3209 is fixedly mounted on the top of the limiting block 3208, and the top of the tension spring 3209 is fixedly mounted on the bottom of the top lifting plate 3205;

[0064] In the above structure, after the top shaft 3104 disengages from the tail of the contact plate 3207, the top lifting plate 3205 is pulled down by the tension of the tension spring 3209. When the top lifting plate 3205 comes into contact with the insecticide placement box 3201, the switch plate 3204 seals the pesticide guide cylinder 3202, so that the switch plate 3204 can return to its original position by the tension of the tension spring 3209.

[0065] In a preferred embodiment: a straw pressing guide plate 23 is fixedly assembled at the bottom of the main frame 1, a straw pressing roller 24 is installed at the bottom of the straw pressing guide plate 23, and the straw pressing guide plate 23 is located at the front end of the straw cutting mechanism 21.

[0066] In the above structure, with the straw pressing guide plate 23 and the straw pressing roller 24 set up, since the straw pressing guide plate 23 and the straw pressing roller 24 are located in front of the straw cutting mechanism 21, the straw pressing guide plate 23 and the straw pressing roller 24 first come into contact with the straw. The straw pressing guide plate 23 can turn the upright straw into an inclined state. Then the straw pressing roller 24 completely presses the inclined straw onto the soil. Then the cutter 2103 can cut the straw into the soil, so that the straw can be buried deeper into the soil.

[0067] In a preferred embodiment: the bottom of the drug dispensing guide cylinder 3202 is provided with a central guide plate 3203, which is installed on the main frame 1 and has an arc shape.

[0068] In the above structure, by setting the central guide plate 3203, when the insecticide in the insecticide placement box 3201 is discharged through the discharge guide cylinder 3202, the discharge guide cylinder 3202 guides the insecticide to the central guide plate 3203, and then through the central guide plate 3203 to the grass pressing guide plate 23, and then through the grass pressing guide plate 23 to guide the insecticide onto the soil, thereby improving the rationality of the device.

[0069] Working Principle: During operation, the tractor moves the main frame 1 above the soil. As the main frame 1 moves, the straw-pressing guide plate 23 and the straw-pressing roller 24 also move. The straw-pressing guide plate 23 tilts the upright straw, and then the straw-pressing roller 24 completely flattens the tilted straw onto the soil. The cutter 2103, in contact with the soil, rolls under the movement of the main frame 1, cutting the flattened straw into the soil. When the connecting shaft 2106 rotates, it drives the rotating disc 3101, mounting bracket 3102, connecting pin 3103, and top shaft 3104 to rotate. The top shaft 3104 intermittently contacts the contact plate 3207 during rotation. As the top shaft 3104 rotates, it gradually causes the contact plate 3207, lifting rod 3206, top lifting plate 3205, and switch plate 3204 to move towards the soil. When the switch plate 3204 moves upward, the pesticide dispensing guide tube 3202 connects with the pesticide storage box 3201. At this time, the pesticide in the pesticide storage box 3201 will slide down through the pesticide dispensing guide tube 3202 and come into contact with the middle guide plate 3203. The middle guide plate 3203 guides the pesticide to the straw pressing guide plate 23, and then the straw pressing guide plate 23 guides the pesticide onto the soil and into the groove cut by the cutter 2103. Subsequently, the rotary tiller 5 rotates to mix the straw, pesticide, and soil. When the top shaft 3104 is not in contact with the contact plate 3207, the tension of the tension spring 3209 moves the top lifting plate 3205 and the switch plate 3204 downward, so that the switch plate 3204 is located in the pesticide dispensing guide tube 3202. At this time, the pesticide in the pesticide storage box 3201 will not flow out through the pesticide dispensing guide tube 3202.

[0070] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0071] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A straw-returning rotary tiller, comprising a main frame (1), characterized in that: The inner cavity of the main frame (1) is provided with a straw crushing component (2), the top of the main frame (1) is provided with an insecticide feeding component (3), the top of the main frame (1) is provided with a gearbox (4), and the power output shaft of the gearbox (4) is provided with a rotary tiller (5). The straw crushing assembly (2) includes a straw cutting mechanism (21), and a blade adjustment mechanism (22) is installed in the inner cavity of the straw cutting mechanism (21). The straw cutting mechanism (21) includes a rotating shaft (2101), the outer wall of the rotating shaft (2101) is provided with a number of T-shaped grooves (2102), the inner wall of the T-shaped grooves (2102) is provided with a number of cutters (2103), and a cutter adjustment mechanism (22) is provided between each cutter (2103). The inner wall of the rotating shaft (2101) is provided with a connecting shaft (2106), and the connecting shaft (2106) is movably connected to the main frame (1). The insecticide dispensing assembly (3) includes an insecticide dispensing power mechanism (31), and an insecticide dispensing switch mechanism (32) is provided on the top of the insecticide dispensing power mechanism (31). The insecticide dispensing switch mechanism (32) includes an insecticide placement box (3201), a dispensing guide cylinder (3202) is installed at the bottom of the insecticide placement box (3201), a switch plate (3204) is slidably connected to the inner wall of the dispensing guide cylinder (3202), a top lifting plate (3205) is installed at the top of the switch plate (3204), lifting rods (3206) are installed at the bottom of both ends of the top lifting plate (3205), and a contact plate (3207) is installed at the bottom of the lifting rods (3206). The insecticide dispensing power mechanism (31) includes a rotating disk (3101), and a plurality of mounting brackets (3102) are installed on the outer wall of the rotating disk (3101). A connecting pin (3103) is installed on the inner wall of the mounting bracket (3102), and a top shaft (3104) is movably sleeved on the outer edge of the connecting pin (3103). The rotating disk (3101) is mounted on the connecting shaft (2106), and the rotating disk (3101) is mounted on both ends of the connecting shaft (2106). The outer edge of the lifting rod (3206) is movably connected to a limiting block (3208), the limiting block (3208) is installed on the insecticide placement box (3201), and the included angle between the limiting block (3208) and the contact plate (3207) is 45°; The top of the limiting block (3208) is fixedly fitted with a tension spring (3209), and the top of the tension spring (3209) is fixedly fitted to the bottom of the top lifting plate (3205); The bottom of the drug dispensing guide tube (3202) is provided with a central guide plate (3203), which is installed on the main frame (1) and is arc-shaped.

2. The straw-returning rotary tiller according to claim 1, characterized in that: Anti-detachment discs (2104) are installed at both ends of the rotating shaft (2101). Anti-detachment blocks (2105) are fixedly mounted on the outer edge of the anti-detachment discs (2104). The anti-detachment blocks (2105) are inserted into the T-slots (2102).

3. A straw-returning rotary tiller according to claim 1, characterized in that: The tool adjustment mechanism (22) includes a fixed block (2201), a screw (2202) is fixedly mounted on the outer edge of the fixed block (2201), and a movable block (2204) is threadedly connected to the outer edge of the screw (2202).

4. A straw-returning rotary tiller according to claim 3, characterized in that: The outer edge of the movable block (2204) is provided with an annular groove (2205), and a protective sleeve (2203) is movably sleeved on the inner wall of the annular groove (2205). The protective sleeve (2203) is fixedly assembled on the fixed block (2201).

5. A straw-returning rotary tiller according to claim 1, characterized in that: The bottom of the main frame (1) is fixedly equipped with a straw pressing guide plate (23), and a straw pressing roller (24) is installed at the bottom of the straw pressing guide plate (23). The straw pressing guide plate (23) is located at the front end of the straw cutting mechanism (21).

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