Four-wheel drive mini-tiller

Abstract

The patent application discloses a four-wheel drive mini-cultivator, which comprises a frame, walking wheels and rotary cultivators, the walking wheels and rotary cultivators are both installed below the frame, the rotary cultivator comprises a cultivator and a rear output shaft, hollow seats are arranged on the rear output shaft along the axial direction, a through hole is formed on the top of the seat, the cultivator is inserted into the seat from the through hole and connected with the bottom of the seat through a compression spring; a cutter assembly is arranged in the seat, a through hole is formed on the side wall of the seat, the cutter assembly comprises a cutter, the cutter is horizontally inserted out of the through hole, the cultivator drives the cutter to move horizontally to cut off the entangled weeds. The cutter assembly added in the application can automatically cut off the weeds after the cultivator is entangled by the weeds, meanwhile, the cutter blade can be buffered when the blade contacts with the stones in the plowing process, the rigid collision between the blade and the stones can be avoided to damage the blade, the scheme ensures the plowing efficiency and improves the safety in the plowing process.

Description

Technical Field

[0001] This invention relates to the field of agricultural machinery technology, specifically to a four-wheel drive micro-tiller. Background Technology

[0002] With the rapid development of agricultural machinery, the level of agricultural mechanization is increasing. Promoting mini-tillers is an important means to achieve agricultural mechanization. As a machine that is easy to operate and has good applicability, mini-tillers are receiving more and more attention. Mini-tillers are powered by small diesel or gasoline engines and are characterized by light weight, small size, and simple structure. They are widely used in dry land, paddy fields, and orchards in plains, mountains, and hills.

[0003] Due to the complex working environment of mini tillers, the blades of existing mini tillers are easily entangled in weeds during tilling, often requiring manual clearing, especially in areas with abundant weeds. Entangled blades and shafts not only affect tilling efficiency and depth, increasing the load on the prime mover, but manual clearing is also time-consuming, labor-intensive, and carries the risk of blade cuts. Furthermore, stones in the working environment can easily collide with the blades. Since traditional blades are typically fixed to a blade holder, impacts with stones can easily damage them, causing property loss. In fact, if the stone is large and hard, the rigid impact can cause the blade to break off and fly out, posing a safety hazard. Summary of the Invention

[0004] In order to overcome the shortcomings of the prior art, the purpose of this invention is to provide a four-wheel drive mini-tiller to solve the technical problems of existing mini-tillers being easily entangled by weeds and easily impacted by stones.

[0005] The technical solution adopted in this invention is as follows:

[0006] A four-wheel drive mini-tiller includes a frame, wheels, and rotary tillers. The wheels and rotary tillers are mounted under the frame. The rotary tillers include tillers and a rear output shaft. Hollow blade holders are evenly distributed along the axial direction of the rear output shaft. A through hole is opened at the top of the blade holder. The tillers pass through the through hole into the blade holder and are connected to the bottom of the blade holder by a compression spring. A cutter assembly is provided inside the blade holder. A through hole is opened on the side wall of the blade holder. The cutter assembly includes a cutter that extends horizontally through the through hole. The tillers float vertically, driving the cutter to move horizontally to cut tangled weeds.

[0007] Explanation: When weeds get tangled around a tiller blade, the blade will be pulled towards its axis by the weeds.

[0008] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0009] 1. This solution takes into account the natural state of the tiller blade when it is entangled with weeds and adds a cutting blade assembly. The cutting blade assembly of this solution can automatically cut the weeds after the tiller blade is entangled with weeds. After the tiller blade is entangled with weeds, the compression spring can make the tiller blade float vertically, thereby driving the cutting blade to move horizontally. The cutting blade directly cuts the weeds, and the tiller blade continues to work, which can effectively avoid the interference of weeds with tillage.

[0010] 2. The floating nature of the tillage blade in this solution not only allows it to automatically cut weeds when they become entangled, but also enables it to adjust the tillage depth according to geological changes in different scenarios, adapting to tillage depth requirements. Furthermore, it can buffer the blade when it comes into contact with stones during tillage, preventing rigid collisions that could damage the blade and cause property loss. It also prevents the blade from breaking off and flying out, thus improving the safety of the tillage process.

[0011] 3. This solution can adjust the tillage depth appropriately according to geological changes in different scenarios to adapt to tillage depth requirements. For example, in muddy soil with softer soil, the tillage blade extends a longer length and the tillage depth is deeper. Conversely, in hard soil, the spring is compressed and the tillage blade becomes shorter, resulting in a shallower tillage depth. Using this solution can prevent weeds from getting tangled and prevent stones from hitting the blades rigidly. It can also adaptively adjust the tillage depth according to the tillage environment.

[0012] 4. In this design, the cutter extends horizontally through the hole. During rotary tillage, the cutter can break up hard soil clods near the cutter head, making the soil looser and improving the tillage effect.

[0013] In a preferred embodiment of the present invention, the cutter assembly further includes a floating block. The cutter is mounted on the floating block, and a tension spring is provided between the side of the floating block away from the cutter and the cutter holder. A drive unit is provided at one end of the tiller blade that penetrates into the cutter holder. The drive unit abuts against the floating block and is used to drive the floating block to move horizontally. In this design, the floating block achieves reciprocating horizontal movement under the combined action of the drive unit and the tension spring, thereby driving the cutter to reciprocate horizontally to cut weeds, preventing weeds from interfering with tillage, affecting tillage efficiency and depth, and increasing the load on the prime mover.

[0014] In a preferred embodiment of the present invention, the floating block is a rectangular block with a sloping upper end, and the driving part is a through groove opened at the end of the tiller blade along the movement of the cutter blade, with the lower end of the through groove abutting against the sloping surface of the floating block. In this solution, when the through groove moves vertically against the slope, the floating block moves horizontally under the guidance of the slope. The driving is achieved through the cooperation between the through groove and the slope, requiring no additional power, and is energy-saving and practical.

[0015] In a preferred embodiment of the present invention, a first vertically arranged strip-shaped through hole is formed on the side wall of the blade holder. A first guide rod is installed on the blade to fit the first strip-shaped through hole. The first guide rod passes through the first strip-shaped through hole, and a first limiting plate is fixed to one end of the guide rod that protrudes from the blade holder. This solution guides the blade through the first strip-shaped through hole, making the blade float more stably within the blade holder.

[0016] In a preferred embodiment of the present invention, a second strip-shaped through hole is formed on the side wall of the cutter holder parallel to the direction of cutter movement. The second strip-shaped through hole is arranged horizontally, and a second guide rod is installed on the floating block in conjunction with the second strip-shaped through hole. The second guide rod passes through the second strip-shaped through hole, and a second limiting plate is fixed to one end of the guide rod that protrudes from the cutter holder. This solution guides the floating block through the second strip-shaped through hole, which on the one hand makes the floating block more stable during horizontal movement, and on the other hand, also serves to limit the vertical movement of the floating block.

[0017] In a preferred embodiment of the present invention, the driving part is inverted and concave. In this embodiment, the floating block is positioned in the inward concavity of the driving part, with the floating block located between the two sides of the concavity and its slope resting against the top of the concavity.

[0018] In a preferred embodiment of the present invention, the driving unit is in the shape of an inverted "L". In this embodiment, the slope of the floating block rests against the short side of the driving unit.

[0019] In a preferred embodiment of the present invention, the driving part is hole-shaped. In this embodiment, the sloping portion of the floating block is placed inside the hole.

[0020] In a preferred embodiment of the present invention, a driver and a transmission are also included, which are fixed on the vehicle frame. The driver is used to provide power to the transmission. The transmission includes a housing and a main shaft rotatably connected to the housing. A front output shaft is mounted on the wheels and the main shaft is connected to the front output shaft. Attached Figure Description

[0021] Figure 1 This is a structural schematic diagram of an embodiment of the present invention;

[0022] Figure 2 This is a schematic diagram of the rotary tiller blade in an embodiment of the present invention;

[0023] Figure 3 yes Figure 2 A sectional view of region A in the middle;

[0024] Figure 4 This is an exploded view of the tool holder in an embodiment of the present invention.

[0025] The reference numerals in the figures include:

[0026] 1. Frame; 2. Gearbox; 3. Engine; 4. Wheels; 5. Rotary tiller blade; 6. Handlebar; 7. Rear output shaft; 8. Blade holder; 9. Tiller blade; 10. Coupling; 11. Compression spring; 12. First guide rod; 13. First limiting plate; 14. First strip-shaped through hole; 15. Floating block; 16. Tension spring; 17. Slope; 18. Second guide rod; 19. Second limiting plate; 20. Second strip-shaped through hole; 21. Cutting blade; 22. Through hole; 23. Through hole. Detailed Implementation

[0027] Typical embodiments embodying the features and advantages of the present invention will be specifically described in the following description. It should be understood that the present invention can have various variations in different embodiments without departing from the scope of the present invention, and the descriptions and illustrations herein are for illustrative purposes only and not intended to limit the present invention.

[0028] In the description of this application, the terms "inner", "outer", "front", "rear", "one end", "one side", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the structure referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0029] See Figure 1 and Figure 2 As shown, this embodiment discloses a four-wheel drive micro-tiller, including a frame 1, an engine 3, a transmission 2, wheels 4, rotary tillers 5, and a handle 6 mounted on the frame 1. The engine 3 and the transmission 2 are both fixed on the frame 1. The engine 3 is an air-cooled diesel engine used to provide power to the transmission 2. The transmission 2 includes a housing, on which a main shaft is rotatably connected. The wheels 4 and the rotary tillers 5 are both mounted below the frame 1. There are two wheels 4 and two rotary tillers 5, symmetrically arranged. The wheels 4 are located on the front side of the frame 1, and the rotary tillers 5 are located on the rear side of the frame 1. A front output shaft is mounted on the wheels 4, and the main shaft is connected to the front output shaft. The front output shaft drives the wheels 4 to rotate. A rear output shaft 7 is mounted on the rotary tillers 5. The two rear output shafts 7 are connected by a coupling 10. The coupling 10 is connected to the transmission 2. The ends of the two rear output shafts 7 away from the coupling 10 are rotatably connected to the frame 1.

[0030] See Figure 3 and Figure 4As shown, hollow blade holders 8 are evenly distributed along the axial direction of the rear output shaft 7. Specifically, the cross-section of the rear output shaft 7 is polygonal, and several blade discs are evenly installed along the axial direction of the rear output shaft 7. Three hollow blade holders 8 are evenly distributed on the outer side of each blade disc. Each blade holder 8 has a through hole 23 at the top. One end of the tiller 9 passes through the through hole 23 into the blade holder 8 and is connected to the bottom of the blade holder 8 by a compression spring 11. The opposite side wall of the blade holder 8 has a vertically arranged first strip-shaped through hole 14. Two first guide rods 12 are installed on the tiller 9 in conjunction with the two first strip-shaped through holes 14. Each first guide rod 12 passes through one first strip-shaped through hole 14, and a first limiting plate 13 is fixed to one end of each rod that passes out of the blade holder 8. When the tiller 9 floats vertically, the first strip-shaped through hole 14 guides the tiller 9, making the movement of the tiller 9 more stable.

[0031] The blade holder 8 contains a cutting assembly. The vertical floating drive of the tiller 9 propels the cutting assembly horizontally to cut tangled weeds. Specifically, the cutting assembly includes a cutting blade 21 and a floating block 15. The floating block 15 is a rectangular block with a slope 17 at the top. The cutting blade 21 is installed on one side of the floating block 15. A through hole 22 is opened on the side wall of the blade holder 8 to accommodate the cutting blade 21. The cutting blade 21 extends horizontally through the through hole 22. During rotary tillage, the cutting blade 21 can break up soil clods near the blade holder, making the soil looser after rotary tillage. Second strip-shaped through holes 20 are opened on the two side walls of the blade holder 8 parallel to the direction of movement of the cutting blade 21. The second strip-shaped through holes 20 are arranged horizontally. Two second guide rods 18 are installed on the floating block 15 to accommodate the two second strip-shaped through holes 20. Each second guide rod 18 passes through one of the second strip-shaped through holes 20, and a second guide rod is fixed at one end of each rod that protrudes from the blade holder 8. A tension spring 16 is installed between the limiting plate 19, the side of the floating block 15 away from the cutter 21, and the blade holder 8. The end of the tiller 9 that penetrates the blade holder 8 is provided with a drive unit. The drive unit is a through groove opened along the movement of the cutter 21, which is inverted "concave" shape. The floating block 15 is placed in the inward concave position of the drive unit, between the two sides of the concave. The top of the concave rests on the slope 17 of the floating block 15. In other embodiments, the drive unit is inverted "L" shape, and the slope 17 of the floating block rests on the short side of the drive unit. In other embodiments, the drive unit is hole-shaped, and the hole can be square or round. The slope 17 of the floating block is partially placed in the hole. When the tiller 9 floats vertically, the drive unit moves synchronously. The floating block 15 moves horizontally under the guidance of the slope 17 and achieves reciprocating horizontal movement under the action of the tension spring 16, thereby driving the cutter 21 to reciprocate horizontally to cut weeds.

[0032] In practical use, when rotary tilling in relatively loose soil, the force of the tiller blade 9 on the compression spring 11 is F1, and the internal force of the compression spring 11 is F2, F2>F1. The three tiller blades 9 are in the same circle and rotary tilling is carried out normally.

[0033] When the tiller blade 9 gets tangled in weeds, it experiences a significant pulling force F3 from the weeds towards its axis. At this point, F3 + F1 > F2, compressing the spring 11 and causing the tiller blade 9 to float vertically. The drive unit at the lower end of the tiller blade 9 then moves the floating block 15 horizontally, cutting the weeds and achieving the goal of automatically cutting weeds when tangled. If the tiller encounters stones during rotary tillage, the force exerted by the tiller blade 9 on the spring 11 is F1', where F1' > F2 > F1. The spring 11 is compressed, and the tiller blade 9 floats vertically to buffer the impact, preventing rigid collisions between the blade and stones that could damage the blade. Furthermore, this design can adaptively adjust the tillage depth based on soil conditions. For softer soil, the force exerted by the tiller blade 9 on the spring 11 is F1, where F2 > F1, resulting in a longer extension of the tiller blade 9 and a deeper tillage depth. For harder soil, the force exerted by the tiller blade 9 on the spring 11 is F1”, where F1” > F2, resulting in a shorter extension of the tiller blade 9 and a shallower tillage depth. Using this solution, three common problems during tillage can be prevented simultaneously: preventing weeds from tangling and ensuring tillage efficiency; preventing stones from hitting the blades and improving the safety of the tillage process; adaptively adjusting tillage depth and improving rotary tillage adaptability; and overall strong functionality.

[0034] The above embodiments are merely preferred embodiments of the present invention and should not be construed as limiting the scope of protection of the present invention. Any non-substantial changes and substitutions made by those skilled in the art based on the present invention shall fall within the scope of protection claimed by the present invention.

Claims

1. A four-wheel drive mini-tiller, comprising a frame, wheels, and rotary tillers, wherein the wheels and rotary tillers are mounted under the frame, characterized in that: The rotary tiller includes a tiller blade and a rear output shaft. Hollow blade holders are evenly distributed along the axial direction of the rear output shaft. A through hole is opened at the top of the blade holder. The tiller blade passes through the through hole and is connected to the bottom of the blade holder by a compression spring. A cutter assembly is provided inside the blade holder. A through hole is opened on the side wall of the blade holder. The cutter assembly includes a cutter blade. The cutter blade extends horizontally through the through hole. The tiller blade floats vertically, driving the cutter blade to move horizontally to cut the tangled weeds. The cutter assembly also includes a floating block, the cutter is mounted on the floating block, a tension spring is provided between the side of the floating block away from the cutter and the cutter holder, and a drive unit is provided at the end of the tiller that passes through the cutter holder. The drive unit abuts against the floating block and is used to drive the floating block to move horizontally. The floating block is a rectangular block with a slope at the top, and the driving part is a through groove opened at the end of the tiller blade along the movement of the cutter blade. The lower end of the through groove abuts against the slope of the floating block. When rotary tilling in relatively loose soil, the force of the tiller blade on the compression spring is F1, and the internal force of the compression spring is F2, where F2>F1. The tiller blades are in the same circle, and rotary tilling proceeds normally. If the tiller blade is entangled by weeds, the tiller blade is pulled towards the axis by the weeds with a force F3. At this time, F3+F1>F2, the compression spring is compressed, and the tiller blade floats vertically. The drive part at the lower end of the tiller blade drives the floating block to move horizontally, thereby cutting the weeds. If stones are encountered during rotary tilling, the force of the tiller blade on the compression spring is F1', where F1'>F2>F1. The compression spring is compressed, and the tiller blade floats vertically to achieve buffering. If the soil is relatively soft, the force of the tiller blade on the compression spring is F1, where F2>F1. The tiller blade extends a longer length, and the tilling depth is deeper. If the soil is relatively hard, the force of the tiller blade on the compression spring is F1”, where F1”>F2. The tiller blade extends a shorter length, and the tilling depth is shallower.

2. The four-wheel drive mini-tiller according to claim 1, characterized in that: The blade holder has a vertically arranged first strip-shaped through hole on its side wall. A first guide rod is installed on the blade to fit the first strip-shaped through hole. The first guide rod passes through the first strip-shaped through hole, and a first limiting plate is fixed to one end of the guide rod that protrudes from the blade holder.

3. The four-wheel drive mini-tiller according to claim 2, characterized in that: The tool holder has a second strip-shaped through hole on its side wall parallel to the direction of the cutting blade's movement. The second strip-shaped through hole is arranged horizontally. A second guide rod is installed on the floating block in conjunction with the second strip-shaped through hole. The second guide rod passes through the second strip-shaped through hole, and a second limiting plate is fixed to one end of the guide rod that protrudes from the tool holder.

4. The four-wheel drive mini-tiller according to claim 1, characterized in that: The drive unit is in an inverted "concave" shape.

5. The four-wheel drive mini-tiller according to claim 1, characterized in that: The drive unit is in the shape of an inverted "L".

6. The four-wheel drive mini-tiller according to claim 1, characterized in that: The drive unit is shaped like a hole.

7. The four-wheel drive mini-tiller according to claim 1, characterized in that: It also includes a drive and a transmission fixed to the frame. The drive is used to provide power to the transmission. The transmission includes a housing and a main shaft rotatably connected to the housing. A front output shaft is mounted on the wheels and the main shaft is connected to the front output shaft.

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