A rotary tiller blade switching structure and a micro tiller

Abstract

This invention relates to the field of micro-tiller technology and discloses a rotary tiller blade switching structure and a micro-tiller, including a micro-tiller output shaft, an externally mounted fixing sleeve, and a hexagonal shaft fixedly installed on the output shaft. A rotary tiller blade body is slidably mounted outside the fixing sleeve, and the hexagonal shaft is engaged with the inner surface of a positioning plate. A receiving plate is fixedly installed on the positioning plate. This rotary tiller blade switching structure and micro-tiller allow for engagement or disengagement between the hexagonal shaft and the positioning plate by moving the receiving plate, enabling the use of the drive wheels or facilitating their subsequent lifting and retraction. The operation of a lifting screw drives a moving plate to retract the drive wheels. Simultaneously, the second gear rotates, causing the push plate to move, pushing the rotary tiller blade body and connecting it to the hexagonal shaft. A fixing pin then engages and secures the blades, enabling switching between the drive wheels and the rotary tiller blades.

Description

Technical Field

[0001] This invention relates to the field of micro-tiller technology, specifically to a rotary tiller blade switching structure and a micro-tiller. Background Technology

[0002] Mini tillers are a very common type of agricultural machinery. They can be used to work in orchards, vegetable gardens, greenhouses, hilly slopes, and small plots (paddy and dry fields). They are driven by an internal combustion engine to rotate blades, and their weight and design allow the blades to rotate and till the soil surface. Because mini tillers are small and lightweight, they are easy to transport and store. They can work flexibly in small plots, slopes, orchards, and other complex terrains, solving the problem that large agricultural machinery cannot enter.

[0003] Currently, patent CN112514562B discloses a rotary tiller, including a housing and a reducer. A tractor connecting frame is provided on one side of the top of the housing, and the reducer is located inside the tractor connecting frame. A guide assembly is provided on the lower side of the housing near the tractor connecting frame. The guide assembly includes two sets of mounting brackets, which are respectively hinged to the front and back sides of the housing. A longitudinally extending fixing plate is hinged to the bottom of the mounting bracket. Multiple downwardly inclined crushing teeth are provided along the length of the fixing plate on the side away from the housing. A cylinder is hinged to the fixing plate on the side away from the crushing teeth. The other end of the cylinder is rotatably engaged with the outer wall of the housing. A rotating seat is provided on the mounting bracket above the cylinder. An elastic rod is hinged to the rotating seat. The other end of the elastic rod is hinged to a mounting seat that connects to the outer wall of the housing. By installing a toothed soil-shoveling structure at an angle on one side of the rotary tiller's forward direction, the soil before tillage is turned upwards and above the front of the rotary tiller, ensuring that the direction of soil shoveling is opposite to the direction of rotation of the rotary tiller. Then, the rotation of the rotary tiller crushes and refines the turned soil, increasing the impact effect between the soil and the tiller structure, thereby loosening the soil. At the same time, a spring-structured shock-absorbing component is installed behind the shovel-shaped crushing teeth to prevent the crushing teeth from being damaged by direct impact, making it highly practical.

[0004] However, the following problems still exist in the use of the aforementioned mini tillers: depending on the usage scenario, the rotary tiller blades and the drive wheels need to be switched. That is, when moving the mini tiller to a designated position, the drive wheels need to be used, and after reaching the position, the drive wheels need to be removed and replaced with the rotary tiller blades. The whole process is not only very time-consuming and laborious, but also, when used in larger places such as orchards, after rotary tilling, it is necessary to run back to the original rotary tilling position to retrieve the drive wheels, which is very inconvenient. Summary of the Invention

[0005] To address the shortcomings of existing technologies, this invention provides a rotary tiller blade switching structure and a micro-tiller, which allows for more convenient and faster selection of the rotary tiller blades and wheels by switching between them.

[0006] This invention provides the following technical solution: a rotary tiller blade switching structure, including a rotary tiller output shaft, an externally mounted fixed sleeve, and a hexagonal shaft fixedly installed on the rotary tiller output shaft. A rotary tiller blade body is slidably mounted outside the fixed sleeve, and the hexagonal shaft is engaged with the inner surface of a positioning plate. A receiving plate is fixedly installed on the positioning plate, and the receiving plate has a shaft groove and a ball groove. A limiting ball is slidably disposed in the ball groove, and a first electric telescopic rod is fixedly installed on the limiting ball. The first electric telescopic rod is fixedly mounted on a movable... On the plate, a connecting shaft is rotatably mounted on the movable plate, and a positioning pin is provided on the outer surface of the connecting shaft. The positioning pin is engaged with the receiving plate. A traveling wheel is connected to the upper shaft of the connecting shaft. A threaded hole is opened in the middle of the movable plate, and a lifting screw is installed in the threaded hole of the movable plate. A motor is installed at the upper end of the lifting screw. A positioning magnetic rod is adsorbed and attached to the outer surface of the rotary tiller body. A third electric telescopic rod is fixedly installed on the movable plate, and an adjustment plate is fixedly installed at the lower end of the third electric telescopic rod. The adjustment plate is in contact with the hexagonal shaft and the positioning plate.

[0007] Furthermore, the rotary tiller body has a through hexagonal groove inside, and the hexagonal groove inside the rotary tiller body is larger than the outer diameter of the hexagonal shaft and the fixed sleeve. Through the above structure, the rotary tiller body can move freely outside the fixed sleeve, and the rotary tiller body and the hexagonal shaft can be engaged and limited.

[0008] Furthermore, four positioning pins are arranged at equal angles about the center of the connecting shaft, and the connecting shaft is engaged with the receiving plate through the shaft groove opened on the receiving plate. The limiting ball is rolled with the receiving plate through the ball groove. With the above structure, it is easy to support the receiving plate without affecting the rotation of the receiving plate.

[0009] Furthermore, the movable plate has a through cylindrical groove, and a guide rod is installed in the groove. A fixed plate is fixedly installed at the lower end of the guide rod, and a first bearing is installed in the middle of the fixed plate. The fixed plate is rotatably connected to the lifting screw through the first bearing. A support plate is fixedly installed at the upper end of the guide rod, and a second bearing is installed in the middle of the support plate. The lifting screw is rotatably connected to the support plate through the second bearing. A motor is installed on the support plate, and a storage box is fixedly installed on the support plate. With the above structure, the movement range of the movable plate can be limited by the guide rod to prevent the movable plate from rotating.

[0010] Furthermore, the movable plate is configured as a "7"-shaped plate structure, and a fixed rack is fixedly installed on the movable plate. The fixed rack meshes with the first gear. The first gear is rotatably installed at the lower end of the fixed plate, and a second gear is also installed at the lower end of the fixed plate. The pulley is composed of two rotating wheels connected by a belt, and the two rotating wheels that make up the pulley are coaxially connected to the first gear and the second gear, respectively. Through the above structure, it is convenient to drive the second gear to rotate by the rotation of the first gear.

[0011] Furthermore, two limiting slide rods are symmetrically arranged on the lower surface of the fixed plate, and a limiting plate is slidably arranged outside the limiting slide rods. A sliding plate is fixedly installed at the lower end of the limiting plate, and a gear tooth structure is provided at the upper end of the sliding plate. The sliding plate meshes with the second gear through the gear tooth structure at the upper end. With the above structure, the sliding plate can be moved as the second gear rotates, and the sliding plate can be supported and limited while moving.

[0012] Furthermore, a push plate is rotatably mounted on the sliding plate, and a gear set is coaxially mounted on the push plate. A second electric telescopic rod is fixedly mounted on the side of the sliding plate, and a drive rack is provided at the upper end of the second electric telescopic rod. The drive rack meshes with the gear set. Through the above structure, the operation of the second electric telescopic rod can drive the drive rack to rotate, thereby causing the push plate to rotate, so as to realize the use or storage of the push plate.

[0013] Furthermore, three through-positioning grooves are equally spaced on the hexagonal shaft, and a fixing pin is fitted into each of the positioning grooves. A limiting pin is fitted through the fixing pin, and the limiting pin is U-shaped. Both sides of the limiting pin pass through the extension plate, and a positioning rod is fitted through the extension plate. The positioning rod and the limiting pin are fitted together, and a positioning spring is fixedly installed on the positioning rod. The positioning spring is fixedly installed on the side of the extension plate. Through the above structure, it is easy to stably engage and fix the rotary tiller body and the hexagonal shaft.

[0014] The present invention also provides a micro-tiller, including a micro-tiller body, characterized in that: the micro-tiller body includes the rotary tiller blade switching structure described above.

[0015] Compared with the prior art, the present invention has the following beneficial effects:

[0016] This rotary tiller switching structure and micro-tiller allows for engagement and disengagement between the hexagonal shaft and the positioning plate via the movement of the receiving plate. This enables the use of the wheels or facilitates their subsequent raising and lowering for storage. The lifting screw moves the moving plate up and down to store the wheels. Simultaneously, the second gear rotates, causing the sliding plate to move, which in turn moves the push plate, pushing the rotary tiller body and connecting it to the hexagonal shaft. This is then achieved via a fixing pin. The locking mechanism allows for switching between the walking wheels and rotary tillers. An extension plate and positioning rod ensure the stability of the fixing pin, preventing it from falling off during use. A third electric telescopic rod moves the adjustment plate, which in turn adjusts the position of the hexagonal shaft and positioning plate, ensuring smooth engagement. Moving the rack drives the gear set and push plate to rotate. As the push plate rotates, it is retracted, preventing it from obstructing or hindering the rotary tiller during subsequent tilling. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the three-dimensional structure of the micro-tiller body of the present invention;

[0018] Figure 2 This is a schematic diagram of the three-dimensional structure of the walking wheel of the present invention;

[0019] Figure 3 This is a schematic diagram of the three-dimensional structure of the fixing plate of the present invention;

[0020] Figure 4 This is a three-dimensional structural diagram of the lifting screw of the present invention;

[0021] Figure 5 This is a schematic diagram of the three-dimensional structure of the movable plate of the present invention;

[0022] Figure 6 This is a schematic diagram of the three-dimensional structure of the push plate of the present invention;

[0023] Figure 7 This is a schematic diagram of the three-dimensional cross-sectional structure of the gear set of the present invention;

[0024] Figure 8 This is a schematic diagram of the three-dimensional cross-sectional structure of the fixed sleeve of the present invention;

[0025] Figure 9 This is a schematic diagram of the exploded three-dimensional structure of the hexagonal axis of the present invention;

[0026] Figure 10 This is a schematic diagram of the three-dimensional cross-sectional structure of the extension plate of the present invention;

[0027] Figure 11 This is a schematic diagram of the three-dimensional structure of the adjustment plate of the present invention;

[0028] Figure 12 This is a schematic diagram of the three-dimensional cross-sectional structure of the receiving plate of the present invention;

[0029] Figure 13 This is an exploded three-dimensional structural diagram of the connecting shaft of the present invention.

[0030] In the diagram: 1. Tiller body; 2. Tiller output shaft; 3. Fixing sleeve; 4. Rotary tiller blade body; 5. Hexagonal shaft; 6. Positioning plate; 7. Receiving plate; 8. Limiting ball bearing; 9. First electric telescopic rod; 10. Moving plate; 11. Connecting shaft; 12. Positioning pin; 13. Walking wheel; 14. Guide rod; 15. Fixing plate; 16. Lifting screw; 17. Support plate; 18. Motor; 19. Storage box; 20. Positioning magnetic rod; 21. 21. Fixed rack; 22. First gear; 23. Pulley; 24. Second gear; 25. Restricting slide bar; 26. Limiting plate; 27. Sliding plate; 28. Push plate; 29. ​​Gear set; 30. Second electric telescopic rod; 31. Drive rack; 32. Third electric telescopic rod; 33. Adjusting plate; 34. Shaft groove; 35. Ball groove; 36. Fixed pin; 37. Restricting pin; 38. Extension plate; 39. Positioning rod; 40. Positioning spring. Detailed Implementation

[0031] The technical solutions 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.

[0032] Please see Figures 1-13 This invention provides a technical solution: a rotary tiller blade switching structure, including a micro-tiller output shaft 2, an externally mounted fixing sleeve 3, and a hexagonal shaft 5 fixedly installed on the micro-tiller output shaft 2. A rotary tiller blade body 4 is slidably mounted on the outside of the fixing sleeve 3, and the hexagonal shaft 5 is engaged with the inner surface of a positioning plate 6. A receiving plate 7 is fixedly installed on the positioning plate 6, and the receiving plate 7 has a shaft groove 34 and a ball groove 35. A limiting ball 8 is slidably mounted in the ball groove 35, and a first electric telescopic rod 9 is fixedly installed on the limiting ball 8. The rod 9 is fixedly installed on the movable plate 10. The movable plate 10 is rotatably provided with a connecting shaft 11, and the outer surface of the connecting shaft 11 is provided with a positioning pin 12. The positioning pin 12 is engaged with the receiving plate 7. The connecting shaft 11 is connected to a traveling wheel 13. Four positioning pins 12 are arranged at equal angles about the center of the connecting shaft 11. The connecting shaft 11 is engaged with the receiving plate 7 through the shaft groove 34 opened on the receiving plate 7. The limiting ball 8 is rolled with the receiving plate 7 through the ball groove 35. The positioning magnetic rod 20 is adsorbed and attached to the outer surface of the rotary tiller body 4.

[0033] The mini-tiller body 1 can be moved to a designated position via the walking wheels 13, causing the third electric telescopic rod 32 to start working. Because an adjustment plate 33 is provided at the lower end of the third electric telescopic rod 32, the adjustment plate 33 begins to push the positioning plate 6 and the receiving plate 7, causing the sides of the positioning plate 6 and the receiving plate 7 to fit against the adjustment plate 33 (excluding the corners of the non-positioning plate 6 and the receiving plate 7). Then, the first electric telescopic rod 9 begins to retract. Because a limiting ball bearing 8 is fixedly installed on the first electric telescopic rod 9, and the limiting ball bearing 8 forms a rolling connection with the receiving plate 7 through the ball bearing groove 35, therefore... As the first electric telescopic rod 9 retracts, the receiving plate 7 begins to move closer to the moving plate 10. Because the receiving plate 7 is engaged with the positioning pin 12 provided on the outside of the connecting shaft 11 through the shaft groove 34, the positioning pin 12 begins to slide in the shaft groove 34 as the receiving plate 7 moves. Because the positioning plate 6 is fixedly installed on the receiving plate 7, the positioning plate 6 begins to move away from the hexagonal shaft 5 until it is no longer in contact with the hexagonal shaft 5. At this time, the limit between the hexagonal shaft 5 and the positioning plate 6 is released, that is, the traveling wheel 13 no longer rotates with the rotation of the hexagonal shaft 5.

[0034] The movable plate 10 has a threaded hole in the middle, and a lifting screw 16 is installed in the threaded hole. A motor 18 is installed at the upper end of the lifting screw 16. A through-hexagonal groove is opened inside the rotary tiller body 4, and the hexagonal groove inside the rotary tiller body 4 is larger than the outer diameter of the hexagonal shaft 5 and the fixed sleeve 3. A through-cylindrical groove is opened on the movable plate 10, and a guide rod 14 is installed in the groove. A fixed plate 15 is fixedly installed at the lower end of the guide rod 14. A first bearing is installed in the middle of the fixed plate 15, and the fixed plate 15 is rotatably connected to the lifting screw 16 through the first bearing. A support plate 17 is fixedly installed at the upper end of the guide rod 14, and a second bearing is installed in the middle of the support plate 17. The lifting screw 16 is rotatably connected to the support plate 17 through the second bearing, and a motor 18 is installed on the support plate 17. The motor 18 is mounted on a support plate 17, and a storage box 19 is fixedly installed on the support plate 17. The moving plate 10 is configured as a "7"-shaped plate structure, and a fixed rack 21 is fixedly installed on the moving plate 10. The fixed rack 21 meshes with the first gear 22. The first gear 22 is rotatably mounted on the lower end of the fixed plate 15, and a second gear 24 is also installed on the lower end of the fixed plate 15. The pulley 23 is composed of two rotating wheels connected by a belt, and the two rotating wheels that make up the pulley 23 are coaxially connected to the first gear 22 and the second gear 24, respectively. Two limiting slide rods 25 are symmetrically arranged on the lower surface of the fixed plate 15, and a limiting plate 26 is slidably arranged on the outside of the limiting slide rods 25. A sliding plate 27 is fixedly installed on the lower end of the limiting plate 26. A tooth structure is provided on the upper end of the sliding plate 27, and the sliding plate 27 meshes with the second gear 24 through the tooth structure provided on the upper end.

[0035] As the hexagonal shaft 5 disengages from the positioning plate 6, the motor 18 begins to operate. Since the output of the motor 18 is connected to the lifting screw 16, the lifting screw 16 begins to rotate. Because the lifting screw 16 is connected to the moving plate 10 through a threaded hole, the moving plate 10 begins to move under the limiting action of the guide rod 14, i.e., the moving plate 10 begins to move upwards, thereby driving the traveling wheels 13 to move and retract, preventing the traveling wheels 13 from affecting the subsequent rotary tillage process. Because a fixed rack 21 is fixedly installed on the moving plate 10, and the fixed rack 21 is connected to the first gear 22, the first gear 22 begins to rotate. Since the first gear 22 is coaxially connected to the pulley 23, and the pulley 23 is coaxially connected to the second gear 24, the second gear 24 begins to rotate. Because the second gear 24 meshes with the sliding plate 27, under the action of the limiting rod 25 and the limiting plate 26, the sliding... The sliding plate 27 begins to move because the lower end of the sliding plate 27 is equipped with a push plate 28. At this time, the push plate 28 begins to move because the push plate 28 is in contact with the blades on the rotary tiller body 4. At this time, the blades can be pushed to move, that is, the rotary tiller body 4 is pushed to move (the blades on the rotary tiller body 4 are made of iron material that can be attracted by magnets. During the process of the rotary tiller body 4 being retracted, the blades on the rotary tiller body 4 are attracted by the positioning magnetic rod 20. Because the output shaft 2 of the micro-tiller and the micro-tiller body 1 are connected by a resistance shaft, the output shaft 2 of the micro-tiller will not rotate during the pushing process, that is, the hexagonal shaft 5 will not rotate. This allows the rotary tiller body 4 to rotate and adjust its position so that the blades are in contact with the positioning magnetic rod 20, which is convenient for direct docking during subsequent movement). At this time, the square groove opened inside the rotary tiller body 4 begins to be in contact with the outside of the hexagonal shaft 5. Thus, the rotation of the hexagonal shaft 5 can drive the rotary tiller body 4 to rotate. It should be noted that the push plate 28 is an arched plate, and the blades on the rotary tiller body 4 are evenly distributed in more than four pieces, so as to ensure that the movement of the push plate 28 can drive the movement of the rotary tiller body 4.

[0036] A third electric telescopic rod 32 is fixedly installed on the movable plate 10, and an adjusting plate 33 is fixedly installed at the lower end of the third electric telescopic rod 32. The adjusting plate 33 is in contact with the hexagonal shaft 5 and the positioning plate 6. A push plate 28 is rotatably mounted on the sliding plate 27, and a gear set 29 is coaxially mounted on the push plate 28. A second electric telescopic rod 30 is fixedly installed on the side of the sliding plate 27, and a driving rack 31 is provided at the upper end of the second electric telescopic rod 30. The driving rack 31 meshes with the gear set 29. An equal angle is mounted on the hexagonal shaft 5. The hexagonal shaft 5 has three through-positioning grooves, and a fixing pin 36 is fitted into the positioning groove. A limiting pin 37 is installed through the fixing pin 36, and the limiting pin 37 is a "U" shaped structure. The limiting pin 37 extends through the extension plate 38 on both sides. A positioning rod 39 is installed through the extension plate 38, and the positioning rod 39 and the limiting pin 37 are fitted together. A positioning spring 40 is fixedly installed on the positioning rod 39, and the positioning spring 40 is fixedly installed on the side of the extension plate 38.

[0037] As the rotary tiller body 4 and the hexagonal shaft 5 come into contact, remove the fixing pin 36 and the limiting pin 37 from the storage box 19 (these are shown directly on the hexagonal shaft 5 to indicate the installation position, but in actual use, they are only used when the hexagonal shaft 5 and the rotary tiller body 4 are connected). As the rotary tiller body 4 moves to the outside of the hexagonal shaft 5, the fixing pin 36 passes through the rotary tiller body 4 and the hexagonal shaft 5 in sequence. Then, pull the positioning rod 39, causing it to move away from the extension plate 38. Because a positioning spring 40 is fixedly installed on the positioning rod 39, the positioning spring 40 begins to be stretched and deformed. Then, the extension plate 38 and the limiting pin 37 come into contact, and the positioning rod 39 is released. Under the action of the positioning spring 40 restoring its deformation, the positioning rod 39 begins to engage with the limiting pin 37, thereby achieving stable fixation between the rotary tiller body 4 and the hexagonal shaft 5. Then, the second electric telescopic rod 30 starts to work. Since the second electric telescopic rod 30 is fixedly installed with a drive rack 31, the drive rack 31 begins to move upward. Because the drive rack 31 meshes with the gear set 29, the gear set 29 begins to rotate. Since the gear set 29 is coaxially connected with the push plate 28, the push plate 28 begins to rotate towards the sliding plate 27, thereby achieving folding and storage of the push plate 28 and preventing the push plate 28 from affecting the rotation of the rotary tiller body 4.

[0038] After use, pull the positioning rod 39 to remove the extension plate 38 from the limiting pin 37. Then remove the limiting pin 37 and the fixing pin 36. Place the fixing pin 36, limiting pin 37, and extension plate 38 in the storage box 19. Then, drive the third electric telescopic rod 32 to move the rack 31 downward, so that the push plate 28 begins to rotate away from the sliding plate 27. That is, the push plate 28 begins to fit against the rotary tiller body 4, causing the lifting screw 16 to drive the moving plate 10 downward. At this time, the sliding plate 27 drives the push plate 28 to push the rotary tiller body 4 towards the tiller body 1. At the same time, the third electric... When the telescopic rod 32 starts working, the third electric telescopic rod 32 begins to drive the adjusting plate 33 to adjust the position of the hexagonal shaft 5. As the pushing plate 28 moves, the rotary tiller body 4 is pushed to the outside of the fixed sleeve 3. At this time, the rotary tiller body 4 begins to attract with the positioning magnetic rod 20. Then, the first electric telescopic rod 9 starts working, thereby driving the receiving plate 7 to move away from the moving plate 10 until the positioning plate 6 engages with the hexagonal shaft 5 again. At this time, the rotary tiller body 4 can be stored and the traveling wheel 13 can be used to switch the rotary tiller. At this time, it is no longer necessary to return to the initial position to retrieve the traveling wheel 13, which is more convenient and faster.

[0039] A micro-tiller includes a micro-tiller body 1, which includes the rotary tillage blade switching structure described above.

[0040] The lower end of the micro-tiller body 1 is equipped with a micro-tiller output shaft 2 via a resistance shaft. The micro-tiller output shaft 2 can be driven to rotate through the internal structure of the micro-tiller body 1. The driving method is the same as that of existing micro-tillers. Fixing plates 15 are fixedly installed on both sides of the micro-tiller body 1 by screws. A support plate 17 is provided on the upper end of the fixing plate 15. The support plate 17 is fixedly installed on the micro-tiller body 1.

[0041] 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 rotary tiller blade switching structure, comprising a rotary tiller output shaft (2), an externally mounted fixing sleeve (3), and a hexagonal shaft (5) fixedly mounted on the rotary tiller output shaft (2), characterized in that, Also includes: A rotary tiller body (4) is slidably mounted on the outside of the fixed sleeve (3), and the hexagonal shaft (5) is engaged with the inner surface of the positioning plate (6). A receiving plate (7) is fixedly mounted on the positioning plate (6). The receiving plate (7) has a shaft groove (34) and a ball groove (35). A limiting ball (8) is slidably mounted in the ball groove (35), and a first electric telescopic rod (9) is fixedly mounted on the limiting ball (8). The first electric telescopic rod (9) is fixedly mounted on the moving plate (10). A connecting shaft (11) is rotatably mounted on the moving plate (10), and a positioning pin (12) is provided on the outer surface of the connecting shaft (11). The positioning pin (12) and the receiving plate (7) are engaged. The connecting shaft (11) is connected to the walking wheel (13). The moving plate (10) has a threaded hole in the middle, and a lifting screw (16) is installed in the threaded hole on the moving plate (10). The upper end of the lifting screw (16) is equipped with a motor (18). The outer surface of the rotary tiller body (4) is attached to the positioning magnetic rod (20). The moving plate (10) is fixedly installed with a third electric telescopic rod (32), and the lower end of the third electric telescopic rod (32) is fixedly installed with an adjustment plate (33). The adjustment plate (33) is in contact with the hexagonal shaft (5) and the positioning plate (6).

2. The rotary tiller blade switching structure according to claim 1, characterized in that: The rotary tiller body (4) has a through hexagonal groove inside, and the hexagonal groove inside the rotary tiller body (4) is larger than the outer diameter of the hexagonal shaft (5) and the fixing sleeve (3).

3. A rotary tillage blade switching structure according to claim 1 or 2, characterized in that: The positioning pins (12) are arranged at equal angles to the center of the connecting shaft (11), and the connecting shaft (11) is engaged with the receiving plate (7) through the shaft groove (34) opened on the receiving plate (7), and the limiting ball (8) is rolled with the receiving plate (7) through the ball groove (35).

4. A rotary tillage blade switching structure according to claim 1 or 2, characterized in that: The movable plate (10) is provided with a through cylindrical groove, and a guide rod (14) is provided in the groove. A fixed plate (15) is fixedly installed at the lower end of the guide rod (14). A first bearing is installed in the middle of the fixed plate (15), and the fixed plate (15) is rotatably connected to the lifting screw (16) through the first bearing. A support plate (17) is fixedly installed at the upper end of the guide rod (14), and a second bearing is installed in the middle of the support plate (17). The lifting screw (16) is rotatably connected to the support plate (17) through the second bearing. An electric motor (18) is provided on the support plate (17), and a storage box (19) is fixedly installed on the support plate (17).

5. The rotary tiller blade switching structure according to claim 4, characterized in that: The movable plate (10) is configured as a "7" shaped plate structure, and a fixed rack (21) is fixedly installed on the movable plate (10). The fixed rack (21) meshes with the first gear (22). The first gear (22) is rotatably installed at the lower end of the fixed plate (15), and a second gear (24) is also installed at the lower end of the fixed plate (15). The pulley (23) is composed of two rotating wheels connected by a belt, and the two rotating wheels that make up the pulley (23) are coaxially connected to the first gear (22) and the second gear (24) respectively.

6. The rotary tiller blade switching structure according to claim 5, characterized in that: Two limiting slide rods (25) are symmetrically arranged on the lower surface of the fixed plate (15), and a limiting plate (26) is slidably arranged outside the limiting slide rods (25). A sliding plate (27) is fixedly installed at the lower end of the limiting plate (26). A gear tooth structure is provided at the upper end of the sliding plate (27), and the sliding plate (27) meshes with the second gear (24) through the gear tooth structure provided at the upper end.

7. The rotary tiller blade switching structure according to claim 6, characterized in that: A push plate (28) is rotatably mounted on the sliding plate (27), and a gear set (29) is coaxially mounted on the push plate (28). A second electric telescopic rod (30) is fixedly mounted on the side of the sliding plate (27), and a drive rack (31) is provided at the upper end of the second electric telescopic rod (30), and the drive rack (31) meshes with the gear set (29).

8. A rotary tillage blade switching structure according to claim 1, 2, 5, 6 or 7, characterized in that: Three through-positioning grooves are provided at equal angles on the hexagonal shaft (5), and a fixing pin (36) is fitted in the positioning groove on the hexagonal shaft (5). A limiting pin (37) is provided through the fixing pin (36), and the limiting pin (37) is set in a "U" shape. The limiting pin (37) passes through the extension plate (38) on both sides. A positioning rod (39) is provided through the extension plate (38), and the positioning rod (39) and the limiting pin (37) are fitted together. A positioning spring (40) is fixedly installed on the positioning rod (39), and the positioning spring (40) is fixedly installed on the side of the extension plate (38).

9. A micro-tiller, comprising a micro-tiller body (1), characterized in that: The micro-tiller body (1) includes the rotary tillage blade switching structure described in any one of claims 1 to 8.

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