Depth-adjustable rotary cultivator

Abstract

The invention relates to the technical field of agricultural machinery, in particular to a depth-adjustable rotary cultivator which is characterized in that a rotary cultivator frame is slidably arranged in a rack and can move up and down in the rack, a driving shaft is rotatably mounted on the inner wall of the rotary cultivator frame, and the end of the driving shaft is connected with the output end of a motor; fixing seats designed in an array mode are installed on the peripheral face of the driving shaft, and a rotary tillage cutter plate is installed on the surface of each fixing seat; due to the fact that the rotary cultivator frame can move up and down in the machine frame, the depth of a tool bit of the rotary tillage tool board is gradually increased when the tool bit of the rotary tillage tool board enters soil, then under continuous rotation of the driving shaft, the rotary tillage tool board starts to rotate in the direction away from the soil and brings out the crushed soil, and through the sliding design of the rotary cultivator frame, the soil can be crushed conveniently; meanwhile, the plow pan can be broken through deep ploughing, the air permeability and the water permeability of the soil are improved, and the improvement effect on the clay soil is especially remarkable.

Description

Technical Field

[0001] The invention relates to the technical field of agricultural machinery, in particular to a rotary tiller with adjustable depth. Background Art

[0002] A rotary tiller is a supporting equipment for farmland cultivation. It is a tilling machine that is matched with a tractor to complete ploughing and harrowing operations. It has been widely used and has the characteristics of strong soil crushing ability and flat surface after plowing, which is convenient for seeding machine operation.

[0003] The prior art also proposes some solutions, such as a Chinese patent with announcement number CN219981777U that discloses a rotary tiller with adjustable tillage depth, including a main body mechanism, an adjustment mechanism and a limit mechanism, wherein the adjustment mechanism is located at the upper end of the main body mechanism, and the limit mechanism is located at the upper end of the adjustment mechanism. The rotary tiller with adjustable tillage depth can adjust the depth of the rotary tillage harrow according to the use requirements when the rotary tiller body is performing tillage operations, and the manual adjustment method can make it easier for users to control the height of the tillage harrow.

[0004] Although the above technical solution controls the height of the tiller by manual adjustment, there are still some inconveniences in actual use. The rotary tiller has many blades, and they are all made of metal. The weight of multiple metal blades combined is large. When manually adjusted, a large force is required, which makes it difficult for ordinary people to use it easily, limiting the scope of application of the equipment. In addition, the blades are generally sharp. When adjusting, since a large force is required, people often have no time to take into account their own environment and posture, which makes it easy for the blades to cause harm to the staff during the adjustment process.

[0005] To this end, the present invention provides a rotary tiller with adjustable depth. Summary of the invention

[0006] In order to solve the above technical problems, the present invention provides a depth-adjustable rotary tiller, including a frame, a rotary tiller frame is slidably arranged inside the frame, the rotary tiller frame can move up and down inside the frame, a drive shaft is rotatably installed on the inner wall of the rotary tiller frame, the end of the drive shaft is connected to the output end of the motor, and the outer peripheral surface of the drive shaft is installed with a fixed seat designed in an array, and a rotary tiller blade is installed on the surface of each of the fixed seats.

[0007] In an embodiment of the present invention, a driving horizontal shaft is installed on the inner wall of the frame. A limiting convex plate is fixedly installed on the outer peripheral surface of the driving horizontal shaft. An arc-shaped top plate is installed on the upper end surface of the rotary tiller frame. The end of the driving horizontal shaft is connected to the output end of the motor. During the process of the driving horizontal shaft driving the limiting convex plate to move, the arc-shaped end of the limiting convex plate will contact the arc-shaped top plate. During operation, when the driving shaft drives the fixed seat and the rotary tiller blade plate to rotate, and the cutter head of the rotary tiller blade plate is initially inserted into the soil, at this time, the driving horizontal shaft is simultaneously controlled to rotate. The driving horizontal shaft drives the limiting convex plate on its outer peripheral surface to rotate synchronously. During the rotation of the limiting convex plate, its protruding part will contact the arc-shaped end of the arc-shaped top plate, that is, it can squeeze the arc-shaped end of the arc-shaped top plate, so that the arc-shaped top plate drives the rotary tiller frame to move downward.

[0008] In an embodiment of the present invention, limiting vertical grooves are provided on both side walls of the rotary tiller frame. A limiting support rod is installed on the inner wall of the frame. One end of the limiting support rod is arranged inside the limiting vertical groove. A limiting spring is installed on the groove wall of the limiting vertical groove. The end of the limiting spring away from the limiting vertical groove is connected to the end of the limiting support rod. The shape of the limiting support rod is adapted to the shape of the limiting vertical groove. During operation, when the limiting convex plate squeezes the arc-shaped top plate, that is, when the rotary tiller frame moves downward, the rotary tiller frame will move downward under the mutual limitation of the limiting vertical groove and the limiting support rod, that is, the rotary tiller frame will move on the vertical axis, and will drive the driving shaft and the rotary tiller blade plate to move up and down on the vertical axis. In this way, it can ensure that the rotary tiller blade plate moves in a vertical line when moving downward, and further avoid the problem of the rotary tiller frame being skewed when moving downward, which is beneficial to the rotary tillage and crushing of the soil.

[0009] In an embodiment of the present invention, the rotary tiller blade plate is rotatably designed inside the fixed seat through a rotating column. A limiting support head is installed on the surface of the fixed seat. The end of the limiting support head contacts the side wall of the rotary tiller blade plate. A groove adapted to the rotating column is provided inside the fixed seat. The limiting support head is arranged on one side of the rotary tiller blade plate in the rotation direction. During operation, when the cutter head of the rotary tiller blade plate contacts the ground, since the rotary tiller blade plate is rotatably designed inside the fixed seat, that is, the rotary tiller blade plate will rotate towards the side close to the limiting support head. The limiting support head will give a certain supporting force to the rotary tiller blade plate. Thus, under the continuous rotation of the rotary tiller blade plate, the rotary tiller blade plate will penetrate into the soil. Moreover, under the limitation of the limiting support head, the position of the rotary tiller blade plate remains unchanged and can continue to carry out rotary tillage on the soil. With such a design, when the rotary tiller blade plate first contacts the soil and rotates at a certain angle and leans against one side of the limiting support head, during this process, it can have a certain loosening effect on the soil, thus facilitating the penetration of the rotary tiller blade plate.

[0010] In one embodiment of the present invention, a torsion spring is sleeved on the outer peripheral surface of the rotating column, a circular groove adapted to the torsion spring is provided inside the fixed seat, a rotary tillage knife head is installed at the end of each rotary tillage knife plate, and the rotary tillage knife head can deflect to a certain extent at the end of the rotary tillage knife plate.

[0011] In one embodiment of the present invention, an annular groove is provided inside each rotary tillage knife plate, a circular plate is installed on the groove wall of the annular groove, a reinforcing rod is installed on the side end surface of the circular plate, the end of the reinforcing rod away from the circular plate is threadedly connected to the rotary tillage knife head, and a thread groove adapted to the reinforcing rod is provided inside the rotary tillage knife head; during operation, when the rotary tillage knife plate enters the soil, the rotary tillage knife head at its end will first contact the soil. Also, since the rotary tillage knife head is movably designed in the annular groove through the reinforcing rod and the circular plate, when the rotary tillage knife head is inside the soil, if there are hard stones or soil clods inside the soil, the rotary tillage knife head will deflect at a certain angle. In this way, not only can the hardened soil be further broken, but also it can deflect inside the soil, further improving the rotary tillage effect of the soil, and simultaneously enhancing the tillage efficiency and soil looseness. At the same time, threading the end of the reinforcing rod away from the circular plate to the rotary tillage knife head can facilitate the replacement of the rotary tillage knife head and improve the practicality of the present invention.

[0012] In one embodiment of the present invention, a connecting frame is installed inside the rotary tillage machine frame, a plurality of cleaning frames are installed inside the connecting frame, the cleaning frames and the rotary tillage knife heads are designed in one-to-one correspondence, and a penetrating groove is provided inside the cleaning frame, and the shape of the penetrating groove is adapted to the shape of the rotary tillage knife head.

[0013] In one embodiment of the present invention, a plurality of tapered rods are provided on the inner wall of the cleaning frame, and the tapered rods are irregularly designed inside the cleaning frame, and the edge of the groove of the cleaning frame is designed with a rounded corner; by providing the tapered rods on the inner wall of the cleaning frame, when the rotary tillage knife head passes through the inner wall of the cleaning frame, the soil clods adhered to the outer wall of the rotary tillage knife head will contact the tapered rods on the inner wall of the cleaning frame, and under the action of the tapered rods, the soil clods or some plastics can be further removed, facilitating the use of this rotary tillage machine.

[0014] In one embodiment of the present invention, a rotating shaft is rotatably provided inside the machine frame, the end of the rotating shaft is connected to the output end of the motor, and a linear array of crushing cone rods is installed on the outer peripheral surface of the rotating shaft; during operation, during the rotation of the drive shaft, the rotation of the rotating shaft is controlled by the controller, and the rotating shaft drives the crushing cone rods to rotate. In this way, after the rotary tillage knife head lifts the large soil blocks turned up from the ground, they will be thrown towards the crushing cone rods, and at this time, the high-speed rotating crushing cone rods will crush the soil blocks a second time, making the soil more loose.

[0015] In one embodiment of the present invention, the crushing cone rods and the rotary tillage knife heads are designed at intervals.

[0016] The above technical solution of the present invention has the following advantages compared with the prior art: For a depth-adjustable rotary tiller of the present invention, during the rotation of the drive shaft, since the rotary tiller frame can move up and down inside the frame, the depth of the cutting heads of the rotary tiller blades gradually increases when entering the soil. Then, with the continuous rotation of the drive shaft, the rotary tiller blades start to rotate away from the soil and bring out the crushed soil. Through the sliding design of the rotary tiller frame, it is convenient to break the soil and can adapt to soils of various hardnesses. At the same time, deep plowing can break the plow sole, improve the air permeability and water permeability of the soil, and especially has a significant improvement effect on clayey soil.

[0017] For a depth-adjustable rotary tiller of the present invention, when the cutting heads of the rotary tiller blades are under the pressure of the soil and the rotary tiller blades drive the rotating column to rotate, the rotating column will simultaneously drive the torsion spring on its surface to contract. Moreover, with the continuous rotation of the drive shaft, when the rotary tiller blades start to rotate away from the soil and bring out the crushed soil, at this time, the rotary tiller blades have moved away from the soil. Therefore, under the elastic force of the torsion spring, it can drive the rotary tiller blades to return to the position before entering the soil and make the rotary tiller blades vibrate by a certain amplitude. In this way, the soil existing on the surface of the rotary tiller blades can be shaken off, reducing the problem that when the rotary tiller blades enter the soil again next time, the resistance to entering the soil is large due to the adhesion of the soil. At the same time, it can also have a certain protective effect on the rotary tiller blades. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to make the content of the present invention easier to be clearly understood, the present invention will be further described in detail below according to the specific embodiments of the present invention in conjunction with the drawings.

[0019] Figure 1 is a three-dimensional structural schematic diagram of the present invention; Figure 2 is a partial structural schematic diagram of the drive horizontal shaft of the present invention; Figure 3 is a partial structural schematic diagram of the limit convex plate of the present invention; Figure 4 is a structural schematic diagram of the fixed seat of the present invention; Figure 5 is in the present invention Figure 4 enlarged view of the structure at A; Figure 6 is a partial structural schematic diagram of the cleaning frame of the present invention; Figure 7 is a structural schematic diagram of the limit support rod of the present invention; Figure 8 is a structural schematic diagram of the limit support head of the present invention; Figure 9 is a partial structural schematic diagram of the rotating column of the present invention; Figure 10 This is a schematic diagram of the partial structure of the connecting frame of the present invention.

[0020] Explanation of the reference numerals in the accompanying drawings of the specification: 1. Frame; 2. Rotary tiller frame; 201. Arc-shaped top plate; 3. Driving shaft; 4. Fixed seat; 401. Rotary tiller blade plate; 402. Rotating column; 5. Driving horizontal shaft; 6. Limit convex plate; 7. Limit vertical groove; 8. Limit support rod; 9. Limit spring; 10. Limit support head; 11. Torsion spring; 12. Rotary tiller blade head; 13. Annular groove; 14. Circular plate; 15. Reinforcing rod; 16. Connecting frame; 17. Cleaning frame; 18. Rotating shaft; 19. Crushing cone rod. Specific embodiments

[0021] The following further describes the present invention in conjunction with the accompanying drawings and specific embodiments, so that those skilled in the art can better understand the present invention and be able to implement it, but the specific embodiments cited are not intended to limit the present invention.

[0022] Refer to Figures 1 to 5 As shown, a depth-adjustable rotary tiller according to an embodiment of the present invention includes a frame 1. A rotary tiller frame 2 is slidably disposed inside the frame 1. The rotary tiller frame 2 can move up and down inside the frame 1. A driving shaft 3 is rotatably installed on the inner wall of the rotary tiller frame 2. The end of the driving shaft 3 is connected to the output end of the motor. An array of fixed seats 4 is installed on the outer peripheral surface of the driving shaft 3. A rotary tiller blade plate 401 is installed on the surface of each fixed seat 4. It should be noted that the frame 1 is installed on the outside of the external driving device through studs; During operation, when specifically using the rotary tiller according to the embodiment of the present invention, the frame 1 is controlled to move forward along the ground by an external driving device, and at the same time, the driving shaft 3 is controlled to rotate, so that the driving shaft 3 drives the fixed seats 4 and the rotary tiller blade plates 401 to rotate. When the blade heads of the rotary tiller blade plates 401 initially enter the soil, at this time, the rotary tiller frame 2 is located on the upper side of the frame 1, so the resistance of the blade heads of the rotary tiller blade plates 401 when entering the soil is the smallest. Then, during the continuous rotation of the driving shaft 3, the rotary tiller frame 2 moves downward inside the frame 1, so that the depth of the blade heads of the rotary tiller blade plates 401 when entering the soil gradually increases. After that, under the continuous rotation of the driving shaft 3, the rotary tiller blade plates 401 start to rotate in a direction away from the soil and bring out the crushed soil. Through the sliding design of the rotary tiller frame 2, it is convenient to crush the soil and can adapt to soils of various hardnesses. At the same time, deep tillage can break the plow sole and improve the air permeability and water permeability of the soil, especially having a significant improvement effect on clayey soils.

[0023] Moreover, with such a design, it can avoid manual adjustment by the staff, the operation is relatively convenient, and at the same time, it ensures the safety of the staff during use.

[0024] The inner wall of the frame 1 is equipped with a driving horizontal shaft 5. A limiting convex plate 6 is fixedly installed on the outer peripheral surface of the driving horizontal shaft 5. An arc-shaped top plate 201 is installed on the upper end surface of the rotary tiller frame 2. The end of the driving horizontal shaft 5 is connected to the output end of the motor. During the process of the driving horizontal shaft 5 driving the limiting convex plate 6 to move, the arc-shaped end of the limiting convex plate 6 will contact the arc-shaped top plate 201. During operation, when the driving shaft 3 drives the fixed seat 4 and the rotary tiller blade plate 401 to rotate, and the cutter head of the rotary tiller blade plate 401 initially enters the soil, at this time, the driving horizontal shaft 5 is simultaneously controlled to rotate. The driving horizontal shaft 5 drives the limiting convex plate 6 on its outer peripheral surface to rotate synchronously. During the rotation of the limiting convex plate 6, the protruding part of it will contact the arc-shaped end of the arc-shaped top plate 201, that is, it can squeeze the arc-shaped end of the arc-shaped top plate 201, so that the arc-shaped top plate 201 drives the rotary tiller frame 2 to move downward. It should be noted that when the rotary tiller frame 2 moves downward, at this time, the depth of the cutter head of the rotary tiller blade plate 401 when entering the soil will also gradually increase. Therefore, during the rotation of the rotary tiller blade plate 401, it can gradually penetrate into the soil interior, which is convenient for crushing the soil interior. It should also be noted that the distance by which the limiting convex plate 6 squeezes the arc-shaped top plate 201 is less than the length of the cutter head of the rotary tiller blade plate 401, so that it can have a certain protective effect on the cutter head of the rotary tiller blade plate 401.

[0025] Refer to Figures 2 to 8 As shown, limiting vertical grooves 7 are opened on both side walls of the rotary tiller frame 2. A limiting support rod 8 is installed on the inner wall of the frame 1. One end of the limiting support rod 8 is arranged inside the limiting vertical groove 7. A limiting spring 9 is installed on the groove wall of the limiting vertical groove 7. The end of the limiting spring 9 far from the limiting vertical groove 7 is connected to the end of the limiting support rod 8. The shape of the limiting support rod 8 is adapted to the shape of the limiting vertical groove 7. During operation, when the limiting convex plate 6 squeezes the arc-shaped top plate 201, that is, when the rotary tiller frame 2 moves downward, the rotary tiller frame 2 will move downward under the mutual limitation of the limiting vertical groove 7 and the limiting support rod 8, that is, the rotary tiller frame 2 will move on the vertical axis, and will drive the driving shaft 3 and the rotary tiller blade plate 401 to move up and down on the vertical axis. In this way, it can ensure that the rotary tiller blade plate 401 moves in a vertical line when moving downward, thereby avoiding the problem of the rotary tiller frame 2 being skewed when it moves downward, which is beneficial to tilling and crushing the soil.

[0026] The rotary tiller blade plate 401 is rotationally designed inside the fixed seat 4 through a rotating column 402. A limiting support head 10 is installed on the surface of the fixed seat 4. The end of the limiting support head 10 contacts the side wall of the rotary tiller blade plate 401. A groove adapted to the rotating column 402 is provided inside the fixed seat 4; the limiting support head 10 is arranged on one side of the rotary tiller blade plate 401 in the rotation direction.

[0027] During operation, when the cutter head of the rotary tillage blade plate 401 contacts the ground, since the rotation of the rotary tillage blade plate 401 is designed inside the fixed seat 4, that is, the rotary tillage blade plate 401 will rotate towards the side close to the limit support head 10, and the limit support head 10 will give a certain supporting force to the rotary tillage blade plate 401. Thus, under the continuous rotation of the rotary tillage blade plate 401, the rotary tillage blade plate 401 will penetrate into the soil. Moreover, under the limitation of the limit support head 10, the position of the rotary tillage blade plate 401 remains unchanged and can continue to till the soil. With such a design, when the rotary tillage blade plate 401 first contacts the soil and rotates at a certain angle and leans against the limit support head 10, during this process, it can have a certain loosening effect on the soil, thus facilitating the penetration of the rotary tillage blade plate 401.

[0028] Referring to Figures 2 to 10 As shown, a torsion spring 11 is sleeved on the outer peripheral surface of the rotating column 402. A circular groove adapted to the torsion spring 11 is opened inside the fixed seat 4. The end of each rotary tillage blade plate 401 is provided with a rotary tillage cutter head 12, and the rotary tillage cutter head 12 can deflect to a certain extent at the end of the rotary tillage blade plate 401; During operation, when the cutter head of the rotary tillage blade plate 401 is subjected to the pressure of the soil and the rotary tillage blade plate 401 drives the rotating column 402 to rotate, the rotating column 402 will simultaneously drive the torsion spring 11 on its surface to contract. Moreover, under the continuous rotation of the drive shaft 3, the rotary tillage blade plate 401 starts to rotate away from the land and takes out the broken soil. At this time, the rotary tillage blade plate 401 has already been away from the soil. Therefore, under the elastic force of the torsion spring 11, it can drive the rotary tillage blade plate 401 to return to the position before entering the soil and make the rotary tillage blade plate 401 vibrate to a certain extent. In this way, the soil existing on the surface of the rotary tillage blade plate 401 can be shaken off, reducing the problem that when the rotary tillage blade plate 401 enters the soil next time, the resistance to entering the soil is large due to the adhesion of the soil. At the same time, it can also have a certain protective effect on the rotary tillage blade plate 401.

[0029] An annular groove 13 is opened inside each rotary tillage blade plate 401. A circular plate 14 is installed on the groove wall of the annular groove 13. A reinforcing rod 15 is installed on the side end face of the circular plate 14. The end of the reinforcing rod 15 away from the circular plate 14 is threadedly connected to the rotary tillage cutter head 12, and a thread groove adapted to the reinforcing rod 15 is opened inside the rotary tillage cutter head 12; During operation, when the rotary tillage blade plate 401 enters the soil, the rotary tillage cutter head 12 at its end will first contact the soil. Also, since the rotary tillage cutter head 12 is movably designed inside the annular groove 13 through the reinforcing rod 15 and the circular plate 14, when the rotary tillage cutter head 12 is inside the soil, if there are hard stones or soil clods inside the soil, the rotary tillage cutter head 12 will deflect at a certain angle. In this way, not only can the compacted soil be further broken, but also it can deflect inside the soil, further improving the rotary tillage effect of the soil, synchronously improving the tillage efficiency and the looseness of the soil; Meanwhile, the end of the reinforcing rod 15 away from the circular plate 14 is threadedly connected to the rotary tillage cutter head 12, which facilitates the replacement of the rotary tillage cutter head 12 and improves the practicability of the present invention.

[0030] A connecting frame 16 is installed inside the rotary tillage machine frame 2. A plurality of cleaning frames 17 are installed inside the connecting frame 16. The cleaning frames 17 and the rotary tillage cutter heads 12 are designed in a one-to-one correspondence. A penetrating groove is formed inside the cleaning frame 17, and the shape of the penetrating groove is adapted to the shape of the rotary tillage cutter head 12. During operation, when the rotary tillage cutter plate 401 starts to rotate away from the land under the continuous rotation of the drive shaft 3 and takes out the crushed soil, the rotary tillage cutter plate 401 will drive the rotary tillage cutter head 12 to rotate towards the side close to the cleaning frame 17. Since a penetrating groove is formed inside the cleaning frame 17 and the shape of the penetrating groove is adapted to the shape of the rotary tillage cutter head 12, the rotary tillage cutter head 12 will enter the penetrating groove. Under the action of the cleaning frame 17 and the penetrating groove, some soil blocks that have not been shaken off can be further removed, thus facilitating the rotary tillage of the rotary tillage cutter head 12 again.

[0031] A plurality of conical rods are arranged on the inner wall of the cleaning frame 17, and the conical rods are irregularly designed inside the cleaning frame 17. The edge of the groove of the cleaning frame 17 is designed with a rounded corner; when the conical rods are arranged on the inner wall of the cleaning frame 17, when the rotary tillage cutter head 12 passes through the inner wall of the cleaning frame 17, the soil blocks adhered to the outer wall of the rotary tillage cutter head 12 will contact the conical rods on the inner wall of the cleaning frame 17, and under the action of the conical rods, the soil blocks or some plastics can be further removed, facilitating the use of the rotary tillage machine. The rounded corner design of the edge of the groove of the cleaning frame 17 facilitates the penetration of the rotary tillage cutter head 12 into the penetrating groove.

[0032] A rotating shaft 18 is rotatably arranged inside the machine frame 1. The end of the rotating shaft 18 is connected to the output end of the motor. A linear array of crushing conical rods 19 is installed on the outer peripheral surface of the rotating shaft 18. The crushing conical rods 19 and the rotary tillage cutter heads 12 are arranged at intervals; during operation, during the rotation of the drive shaft 3, the rotation of the rotating shaft 18 is controlled by the controller, and the rotating shaft 18 drives the crushing conical rods 19 to rotate. Thus, after the rotary tillage cutter head 12 lifts the turned large soil blocks from the ground, they will be thrown towards the crushing conical rods 19, and at this time, the high-speed rotating crushing conical rods 19 will crush the soil blocks for the second time, making the soil looser.

[0033] Working principle: The frame 1 is controlled to move forward along the ground by an external driving device, and at the same time, the driving shaft 3 is controlled to rotate, so that the driving shaft 3 drives the fixed seat 4 and the rotary tillage blade plate 401 to rotate. When the cutting head of the rotary tillage blade plate 401 initially enters the soil, at this time, the rotary tillage machine frame 2 is located on the upper side of the frame 1, so the resistance of the cutting head of the rotary tillage blade plate 401 when entering the soil is the smallest. Then, during the continuous rotation of the driving shaft 3, since the rotary tillage machine frame 2 can move up and down inside the frame 1, the depth of the cutting head of the rotary tillage blade plate 401 when entering the soil gradually increases. After that, under the continuous rotation of the driving shaft 3, the rotary tillage blade plate 401 starts to rotate away from the land and takes out the broken soil. Through the sliding design of the rotary tillage machine frame 2, it is convenient to break the soil and can adapt to soils of various hardnesses. At the same time, deep tillage can break the plow pan, improve the air permeability and water permeability of the soil, and especially has a significant improvement effect on clayey soil; When the driving shaft 3 drives the fixed seat 4 and the rotary tillage blade plate 401 to rotate, and when the cutting head of the rotary tillage blade plate 401 initially enters the soil, at the same time, the driving cross shaft 5 is controlled to rotate. The driving cross shaft 5 drives the limiting convex plate 6 on its outer peripheral surface to rotate synchronously. During the rotation of the limiting convex plate 6, the protruding part thereof will contact the arc end of the arc top plate 201, that is, it can squeeze the arc end of the arc top plate 201, so that the arc top plate 201 drives the rotary tillage machine frame 2 to move downward; It should be noted that when the rotary tillage machine frame 2 moves downward, the depth of the cutting head of the rotary tillage blade plate 401 when entering the soil will also gradually increase. Therefore, during the rotation of the rotary tillage blade plate 401, it can gradually penetrate into the soil interior, which is convenient for breaking the soil interior; it should also be noted that the distance by which the limiting convex plate 6 squeezes the arc top plate 201 is less than the length of the cutting head of the rotary tillage blade plate 401, so that it can have a certain protective effect on the cutting head of the rotary tillage blade plate 401; when the limiting convex plate 6 squeezes the arc top plate 201, that is, when the rotary tillage machine frame 2 moves downward, the rotary tillage machine frame 2 will move downward under the mutual limitation of the limiting vertical groove 7 and the limiting support rod 8, that is, the rotary tillage machine frame 2 will move on the vertical axis and will drive the driving shaft 3 and the rotary tillage blade plate 401 to move downward on the vertical axis. In this way, it can ensure that the rotary tillage blade plate 401 moves in a vertical line when moving downward, thereby avoiding the problem of skew of the rotary tillage machine frame 2 when it moves downward, which is beneficial to rotary tillage and breaking of the soil.

[0034] When the cutter head of the rotary tillage blade plate 401 contacts the ground, since the rotary tillage blade plate 401 is rotationally designed inside the fixed seat 4, that is, the rotary tillage blade plate 401 will rotate towards the side close to the limit support head 10, and the limit support head 10 will give a certain supporting force to the rotary tillage blade plate 401. Thus, under the continuous rotation of the rotary tillage blade plate 401, the rotary tillage blade plate 401 will penetrate into the soil. Moreover, under the limitation of the limit support head 10, the position of the rotary tillage blade plate 401 remains unchanged and can continue to till the soil. With such a design, when the rotary tillage blade plate 401 first contacts the soil and rotates at a certain angle and leans against the limit support head 10, during this process, it can have a certain loosening effect on the soil, thus facilitating the penetration of the rotary tillage blade plate 401; when the cutter head of the rotary tillage blade plate 401 is under the pressure of the soil and the rotary tillage blade plate 401 drives the rotating column 402 to rotate, the rotating column 402 will simultaneously drive the torsion spring 11 on its surface to contract. And under the continuous rotation of the drive shaft 3, the rotary tillage blade plate 401 starts to rotate away from the land. After taking out the broken soil, at this time, the rotary tillage blade plate 401 has been away from the soil. Therefore, under the elastic force of the torsion spring 11, it can drive the rotary tillage blade plate 401 to return to the position before entering the soil and make the rotary tillage blade plate 401 vibrate with a certain amplitude. In this way, the soil adhering to the surface of the rotary tillage blade plate 401 can be shaken off, reducing the problem that when the rotary tillage blade plate 401 enters the soil next time, the resistance to entering the soil is large due to the adhered soil. At the same time, it can also have a certain protective effect on the rotary tillage blade plate 401; When the rotary tillage blade plate 401 enters the soil, the rotary tillage cutter head 12 at its end will first contact the soil. Also, since the rotary tillage cutter head 12 is movably designed in the annular groove 13 through the reinforcing rod 15 and the circular plate 14, when the rotary tillage cutter head 12 is inside the soil, if there are hard stones or soil clods inside the soil, the rotary tillage cutter head 12 will deflect at a certain angle. In this way, it can not only further break up the compacted soil, but also deflect inside the soil, further improving the rotary tillage effect of the soil, synchronously improving the tillage efficiency and the looseness of the soil; when under the continuous rotation of the drive shaft 3, the rotary tillage blade plate 401 starts to rotate away from the land. After taking out the broken soil, the rotary tillage blade plate 401 will drive the rotary tillage cutter head 12 to rotate towards the side close to the cleaning frame 17. Since the inside of the cleaning frame 17 is provided with a through groove, and the shape of the through groove is adapted to the shape of the rotary tillage cutter head 12, the rotary tillage cutter head 12 will enter the through groove. Under the action of the cleaning frame 17 and the through groove, some of the soil clods that have not been shaken off above can be further removed, thus facilitating the re-rotary tillage of the rotary tillage cutter head 12; During the rotation of the drive shaft 3, the controller controls the rotation of the rotating shaft 18, and the rotating shaft 18 drives the crushing cone rod 19 to rotate. Thus, after the rotary tillage cutter head 12 lifts the large soil blocks turned up from the ground, they will be thrown towards the crushing cone rod 19. At this time, the high-speed rotating crushing cone rod 19 will crush the soil blocks for the second time, making the soil looser.

[0035] Obviously, the above embodiments are merely examples given for clear illustration and are not limitations on the implementation manners. For those of ordinary skill in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation manners here. And the obvious changes or modifications derived therefrom are still within the protection scope of the present invention.

Claims

1. A depth-adjustable rotary tiller, characterized in that: It includes a frame. A rotary tiller frame is slidably arranged inside the frame. The rotary tiller frame can move up and down inside the frame. A drive shaft is rotatably installed on the inner wall of the rotary tiller frame. The end of the drive shaft is connected to the output end of the motor. An array of fixed seats is installed on the outer peripheral surface of the drive shaft. A rotary tiller blade plate is installed on the surface of each fixed seat.

2. The depth-adjustable rotary tiller according to claim 1, wherein: A drive cross shaft is installed on the inner wall of the frame. A limiting convex plate is fixedly installed on the outer peripheral surface of the drive cross shaft. An arc-shaped top plate is installed on the upper end surface of the rotary tiller frame. The end of the drive cross shaft is connected to the output end of the motor. When the drive cross shaft drives the limiting convex plate to move, the arc-shaped end of the limiting convex plate will contact the arc-shaped top plate.

3. A depth-adjustable rotary tiller according to claim 2, characterized in that: Limiting vertical grooves are opened on both side walls of the rotary tiller frame. A limiting support rod is installed on the inner wall of the frame. One end of the limiting support rod is arranged inside the limiting vertical groove. A limiting spring is installed on the groove wall of the limiting vertical groove. The end of the limiting spring away from the limiting vertical groove is connected to the end of the limiting support rod. The shape of the limiting support rod is adapted to the shape of the limiting vertical groove.

4. A depth-adjustable rotary tiller according to claim 3, characterized in that: The rotary tiller blade plate is rotatably designed inside the fixed seat through a rotating column. A limiting support head is installed on the surface of the fixed seat. The end of the limiting support head contacts the side wall of the rotary tiller blade plate. A groove adapted to the rotating column is arranged inside the fixed seat; the limiting support head is arranged on one side of the rotary tiller blade plate in the rotation direction.

5. A depth-adjustable rotary tiller according to claim 4, characterized in that: A torsion spring is sleeved on the outer peripheral surface of the rotating column. A circular groove adapted to the torsion spring is opened inside the fixed seat. A rotary tiller cutter head is installed at the end of each rotary tiller blade plate. The rotary tiller cutter head can deflect by a certain amplitude at the end of the rotary tiller blade plate.

6. A depth-adjustable rotary tiller according to claim 5, characterized in that: An annular groove is opened inside each rotary tiller blade plate. A circular plate is installed on the groove wall of the annular groove. A reinforcing rod is installed on the side end face of the circular plate. The end of the reinforcing rod away from the circular plate is threadedly connected to the rotary tiller cutter head. A thread groove adapted to the reinforcing rod is opened inside the rotary tiller cutter head.

7. A depth-adjustable rotary tiller according to claim 5, characterized in that: A connecting frame is installed inside the rotary tiller frame. A plurality of cleaning frames are installed inside the connecting frame. The cleaning frames and the rotary tiller cutter heads are designed in one-to-one correspondence. A penetrating groove is opened inside the cleaning frame. The shape of the penetrating groove is adapted to the shape of the rotary tiller cutter head.

8. A depth-adjustable rotary tiller according to claim 7, characterized in that: A plurality of tapered rods are arranged on the inner wall of the cleaning frame, and the tapered rods are irregularly arranged inside the cleaning frame. The edge of the groove of the cleaning frame is designed with a rounded corner.

9. The rotary tiller with adjustable depth according to claim 2, wherein: A rotating shaft is rotatably arranged inside the frame. The end of the rotating shaft is connected to the output end of the motor. A linear array of crushing cone rods is installed on the outer peripheral surface of the rotating shaft.

10. A depth-adjustable rotary tiller according to claim 9, characterized in that: The crushing cone rods and the rotary tiller cutter heads are arranged at intervals.

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