A rotary cultivator

Abstract

The utility model relates to agricultural machinery technical field, concretely relates to a rotary cultivator, including mounting bracket, drive case and rotary cultivator component. The mounting bracket is composed of bottom plate and both sides mounting plate, is equipped with the shaft mounting spare on the mounting plate. Drive case is fixed in the middle of bottom plate, and the top has power input end, and both sides have power output end, and the power output end is arranged with the coaxial line with shaft mounting spare. Two groups of rotary cultivator components are located between the power output end of drive case both sides and corresponding shaft mounting spare, and the coaxial line is arranged along a plane symmetry, and the power output end of drive case is transmission connection with rotary cultivator component. This symmetry structure has guaranteed the balance of rotary cultivator when working, and power transmission is direct, has reduced energy loss, has improved the working efficiency and stability. The rotary cultivator is suitable for farmland cultivation, has simple structure, maintains convenient and so on.

Description

Technical Field

[0001] This utility model relates to the field of agricultural machinery technology, specifically to a rotary tiller. Background Technology

[0002] Rotary tillers, as essential machinery in modern agriculture, have their structural design directly impacting their operational efficiency and lifespan. A key problem commonly found in the structural layout of traditional rotary tillers is the generation of unbalanced lateral torques during operation due to the offset drive unit or asymmetry between the rotary tillage components on both sides. This unbalanced force state triggers a series of chain reactions: the machine is prone to veering off course during tillage, forcing the operator to frequently correct the direction, increasing labor intensity; prolonged operation under asymmetrical loads subjects critical components such as drive shafts and bearings to alternating stresses, significantly accelerating wear and even leading to premature failure; simultaneously, this instability also limits operating speed and deep tillage effectiveness. Utility Model Content

[0003] The purpose of this utility model is to provide a rotary tiller that can reduce abnormal wear of key components such as drive shafts and bearings, and extend the service life of the whole machine.

[0004] A rotary tiller, comprising:

[0005] The mounting frame includes a base plate and mounting plates disposed on both sides of the base plate, wherein the mounting plates are provided with connecting shaft mounting components;

[0006] A drive box is mounted on the base plate and located in the middle of the mounting plates on both sides. The top of the drive box is provided with a power input end, and the two sides are respectively provided with power output ends. The power output ends are coaxially arranged with the connecting shaft mounting component.

[0007] The rotary tillage assembly is provided in two sets. The two sets of rotary tillage assemblies are respectively located between the power output ends on both sides of the drive box and the corresponding connecting shaft mounting parts. The two sets of rotary tillage assemblies are coaxial and symmetrically arranged along a plane. The power output ends on both sides of the drive box are connected to the rotary tillage assemblies for transmission.

[0008] In some embodiments, the rotary tillage assembly includes:

[0009] A rotary tiller shaft, wherein one end of the rotary tiller shaft is provided with a driving end and the other end is provided with a driven end, the driving end is connected to the power output end in a transmission connection, and the driven end is connected to the coupling mounting component in a transmission connection;

[0010] The rotary tiller assembly includes multiple sets of rotary tiller assemblies, which are evenly spaced along the axial direction of the rotary tiller shaft.

[0011] In some embodiments, the power output end includes an output shaft, the cross-section of which is configured as a toothed structure, and a first connecting hole is provided on the output shaft along its own radial direction;

[0012] The active end includes an active sleeve, the cross-section of the inner cavity of the active sleeve is adapted to the output shaft, and a second connecting hole adapted to the first connecting hole is provided on the active sleeve.

[0013] In some embodiments, the driven end includes a fixed flange adapted to the coupling mounting member, and a bearing member is provided between the fixed flange and the rotary tillage shaft.

[0014] In some embodiments, the rotary tiller assembly includes a rotary tiller plate and rotary tiller blades. The rotary tiller plate is fixedly disposed along a direction perpendicular to the axis of the rotary tiller shaft. The rotary tiller plate has fixing holes for fixing the rotary tiller blades, and the rotary tiller blades are disposed on the rotary tiller plate through the fixing holes.

[0015] In some embodiments, a plurality of rotary tillage blades are provided, and the plurality of rotary tillage blades are evenly spaced along the circumference of the rotary tillage plate.

[0016] In some embodiments, two rotary tillage blades are provided, and the two rotary tillage blades are arranged in parallel with a gap between them. The gap between the two rotary tillage blades in the same group is adapted to the thickness of the rotary tillage blades.

[0017] In some embodiments, the rotary tiller assembly further includes a partition plate disposed between two rotary tillers, and the rotary tillers are provided with a plurality of mounting slots, with a plurality of rotary tillers respectively disposed in the plurality of mounting slots.

[0018] In some embodiments, the partition plates of the plurality of rotary tillage blade assemblies are staggered sequentially along the circumference of the rotary tillage shaft.

[0019] The beneficial effects of this invention are as follows: By placing the drive box in the center of the base plate and ensuring that its power output ends on both sides are coaxial with the connecting shafts on the mounting plate, two sets of rotary tillage components are symmetrically arranged on both sides of a plane, forming a completely symmetrical power transmission and tillage structure. This symmetrical design effectively reduces the lateral torque generated during operation, resulting in balanced force distribution on the entire machine, significantly improving walking stability and effectively preventing deviation. The balanced load distribution greatly reduces abnormal wear on key components such as the drive shaft and bearings, extending the machine's service life. Operators no longer need to frequently adjust direction, reducing labor intensity, while providing a solid foundation for increased operating speed and more uniform deep tillage, significantly improving overall operating efficiency and economy. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the structure of a rotary tiller according to the present invention;

[0021] Figure 2 This is a schematic diagram of the mounting bracket in this utility model;

[0022] Figure 3 for Figure 2 Enlarged view of section A;

[0023] Figure 4 This is a schematic diagram of the rotary tillage component in this utility model;

[0024] Figure 5 This is a schematic diagram of the rotary tillage blade assembly in this utility model;

[0025] Figure 6 This is an isometric view of the rotary tillage blade assembly in this utility model.

[0026] Reference numerals: 1. Mounting bracket; 11. Base plate; 12. Mounting plate; 2. Drive box; 21. Power input end; 22. Power output end; 221. Output shaft; 222. First connecting hole; 3. Rotary tillage assembly; 31. Rotary tillage shaft; 32. Rotary tillage blade assembly; 321. Rotary tillage plate; 322. Divider plate; 323. Mounting groove; 324. Rotary tillage blade; 325. Fixing hole; 33. Driving end; 331. Driving sleeve; 332. Second connecting hole; 34. Driven end. Detailed Implementation

[0027] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. The components of the embodiments of this utility model described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0028] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0029] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0030] In the description of the embodiments of this utility model, it should be noted that if terms such as "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," or "outer" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the utility model product is in use, they are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, terms such as "first," "second," and "third" are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0031] Furthermore, the use of terms such as "horizontal," "vertical," and "sag" does not imply that the component must be absolutely horizontal or suspended, but rather that it can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal relative to "vertical," and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0032] Rotary tillers, as essential machinery in modern agricultural cultivation, have structural designs that directly impact their operational efficiency and lifespan. A key problem commonly found in the structural layout of traditional rotary tillers is the generation of unbalanced lateral torques during operation due to the offset drive unit or asymmetry between the rotary tillage components on both sides. This unbalanced force state triggers a series of chain reactions, causing the machine to easily veer off course during tillage, forcing operators to frequently correct the direction and increasing labor intensity. Furthermore, prolonged operation under asymmetrical loads subjects critical components such as drive shafts and bearings to alternating stresses, significantly accelerating wear and even leading to premature failure. Simultaneously, this instability limits operating speed and deep tillage effectiveness. Therefore, this application provides a rotary tiller.

[0033] Reference Figures 1 to 3 The rotary tiller includes a mounting frame 1, a drive box 2, and a rotary tillage assembly 3. The mounting frame 1 includes a base plate 11 and mounting plates 12 disposed on both sides of the base plate 11. The mounting plates 12 are equipped with coupling mounting components. The mounting frame 1 serves as the basic support structure of the entire machine, including the base plate 11 and the mounting plates 12 disposed on both sides of the base plate 11. The base plate 11 is made of a single steel plate that has been bent into shape. Main steel columns are disposed on both sides of the base plate, and reinforcing ribs are welded to the bottom to improve the structural rigidity. The mounting plates 12 are vertically fixed to the two sides of the base plate 11 and are connected to the base plate 11 by high-strength bolts or welding. The coupling mounting components are fixedly installed on the mounting plates 12. The coupling mounting components adopt a bearing seat structure with flanges.

[0034] The drive box 2 is mounted on the base plate 11 and located in the middle of the two mounting plates 12. The top of the drive box 2 has a power input end 21, and the two sides each have a power output end 22. The power output ends 22 are coaxially aligned with the coupling mounting component. The drive box 2 is the core of the power distribution system. The drive box 2 has a metal body and contains a transmission system. The top of the drive box 2 has a power input end 21, and the two sides each have a power output end 22. The power input end 21 is connected to the tractor's power output shaft 221 via a spline sleeve. The power output ends 22 are coaxially aligned with the coupling mounting component to ensure the linearity of power transmission. The transmission system can be a multi-stage gear transmission system or a chain and sprocket transmission system, etc.

[0035] Reference Figure 1 and Figure 4 The rotary tillage assembly 3 is provided in two sets. The two sets of rotary tillage assemblies 3 are respectively located between the power output end 22 on both sides of the drive box 2 and the corresponding connecting shaft mounting parts. The two sets of rotary tillage assemblies 3 are coaxial and symmetrically arranged along a plane. The power output end 22 on both sides of the drive box 2 is connected to the rotary tillage assembly 3 through transmission. The two sets of rotary tillage assemblies 3 are respectively located between the power output end 22 on both sides of the drive box 2 and the corresponding connecting shaft mounting parts. The two sets of rotary tillage assemblies 3 are coaxial and symmetrically arranged along a plane. This symmetrical layout effectively balances the torsional torque during operation. The power output end 22 on both sides of the drive box 2 is connected to the rotary tillage assembly 3 through involute spline transmission. The spline fit adopts a small clearance design to ensure transmission accuracy.

[0036] Reference Figure 4 and Figure 5 In some embodiments, the rotary tillage assembly 3 includes a rotary tillage shaft 31 and rotary tillage blade assemblies 32. The rotary tillage shaft 31 is forged from high-strength alloy steel, possessing excellent torsional strength and bending stiffness to withstand the enormous and complex alternating loads generated by the soil during tillage. One end of the rotary tillage shaft 31 is provided with an active end 33, and the other end is provided with a driven end 34. The active end 33 is drivenly connected to the power output end 22, and the driven end 34 is drivenly connected to the coupling mounting component. Multiple sets of rotary tillage blade assemblies 32 are provided, and the multiple sets of rotary tillage blade assemblies 32 are evenly spaced along the axial direction of the rotary tillage shaft 31. The spacing between adjacent sets is designed to be equidistant according to agronomic requirements, and the spacing value is determined according to the actual situation. The rotary tillage blade assemblies 32 can be fixed by a heat fitting process, where the rotary tillage blade assemblies 32 are heated to 300°C and then fitted into the rotary tillage shaft 31. After cooling, an interference fit is formed to ensure that no relative rotation occurs under working load. Alternatively, welding, bolt fixing, or other methods can be used for fixing.

[0037] The power output end 22 includes an output shaft 221. The cross-section of the output shaft 221 is set with a toothed structure. A first connecting hole 222 is provided on the output shaft 221 along its own radial direction. The cross-section of the output shaft 221 is set with a toothed structure, specifically adopting an involute spline tooth shape. The spline teeth are modified to reduce stress concentration. The first connecting hole 222 is provided on the output shaft 221 along its own radial direction. The first connecting hole 222 is a through hole structure.

[0038] Reference Figures 1 to 4 The active end 33 includes an active sleeve 331. The cross-section of the inner cavity of the active sleeve 331 is adapted to the output shaft 221. The active sleeve 331 has a second connecting hole 332 adapted to the first connecting hole 222. The cross-section of the inner cavity of the active sleeve 331 is adapted to the output shaft 221. The spline of the inner cavity is formed by broaching. The second connecting hole 332 is a stepped hole design, and the small diameter section is fitted with the connecting bolt. During assembly, the spline teeth of the output shaft 221 are precisely aligned with the inner groove of the active sleeve 331 and then slid together. After the first connecting hole 222 and the second connecting hole 332 are aligned, a high-strength reamed bolt is inserted to ensure a reliable connection; alternatively, the first connecting hole 222 and the second connecting hole 332 can also be connected by a pin.

[0039] In some embodiments, the driven end 34 includes a fixed flange adapted to the coupling mounting component, and a bearing component is disposed between the fixed flange and the rotary tiller shaft 31. The fixed flange is made of forged steel, and its dimensions are adapted to the coupling mounting component. Its end face has a stop structure that mates with the bearing seat of the coupling mounting component. The bearing component is a roller bearing, which can simultaneously withstand radial force and axial thrust. The inner ring of the bearing is interference-fitted with the rotary tiller shaft 31, and the interference amount is calculated to ensure that it does not loosen during operation. The outer ring of the bearing is clearance-fitted with the bearing seat of the coupling mounting component for easy installation and adjustment. Sealing rings are installed on both sides of the bearing, and the sealing gap is filled with lithium-based grease to effectively prevent the intrusion of soil and moisture.

[0040] Reference Figure 4 and Figure 5 In some embodiments, the rotary tiller assembly 32 includes a rotary tiller plate 321 and rotary tiller blades 324. The rotary tiller plate 321 is fixedly arranged in a direction perpendicular to the axis of the rotary tiller shaft 31. The rotary tiller plate 321 is provided with fixing holes 325 for fixing the rotary tiller blades 324. The rotary tiller blades 324 are arranged on the rotary tiller plate 321 through the fixing holes 325.

[0041] The surface of the rotary tiller 321 is perpendicular or nearly perpendicular to the axis of the rotary tiller shaft 31. The connection between the rotary tiller 321 and the rotary tiller shaft 31 can be achieved by full-circumference fillet welding or butt welding with high-strength welds, or by using an interference fit with a pin locking method, ensuring that it will not loosen or deflect when subjected to the huge cutting reaction force and vibration transmitted from the rotary tiller blades 324. The rotary tiller 321 has dedicated mounting holes for installing the rotary tiller blades 324. These mounting holes allow fasteners such as bolts, rivets, or special locking pins to pass through, thereby firmly pressing the blade handles or mounting lugs of the rotary tiller blades 324 onto the rotary tiller 321.

[0042] In some embodiments, multiple rotary tillage blades 324 are provided, and the multiple rotary tillage blades 324 are evenly spaced along the circumference of the rotary tillage plate 321. In this embodiment, four rotary tillage blades 324 are fixed on each rotary tillage plate 321, with an included angle of 90 degrees between adjacent blades to ensure uniform force during tillage. The number of rotary tillage blades 324 can be adjusted according to different actual conditions. When the rotary tillage shaft 31 rotates, the circumferentially distributed rotary tillage blades 324 can form a continuous, stable, and overlapping cutting surface, effectively avoiding excessive force at a single point and periodic impact, making the tillage process more stable and the soil breaking effect more uniform. It also helps to balance the centrifugal force generated by the rotary tillage shaft 31 when rotating at high speed, reducing vibration and bearing wear. The rotary tillage blades 324 adopt a curved blade design, and the blade curve is optimized by computer simulation to improve the rotary tillage effect.

[0043] Reference Figure 5 In some embodiments, two rotary tillage plates 321 are provided, arranged parallel to each other with a gap between them. The gap between two rotary tillage plates 321 in the same group is adapted to the thickness of the rotary tillage blades 324. The two rotary tillage plates 321 are arranged in a parallel and spaced relationship in space, and their parallelism and perpendicularity to the rotary tillage shaft 31 are ensured by positioning clamps or special molds. The gap between two adjacent rotary tillage plates 321 is precisely designed to adapt to the thickness of the handle or mounting lug of the rotary tillage blades 324 to be installed. The gap is slightly larger than the thickness of the rotary tillage blades 324 to facilitate installation and ensure that when the rotary tillage blades 324 are clamped between the two rotary tillage plates 321 and locked with fasteners, sufficient surface contact pressure and friction can be formed to effectively prevent the rotary tillage blades 324 from circumferentially moving or swaying under the action of cutting resistance torque.

[0044] In some embodiments, the rotary tiller assembly 32 further includes a partition plate 322 disposed between two rotary tiller plates 321. Each rotary tiller plate 321 has a plurality of mounting slots 323, and a plurality of rotary tiller blades 324 are respectively disposed within the plurality of mounting slots 323. To create more precisely positioned mounting positions for the rotary tiller blades 324 between adjacent rotary tiller plates 321 and to prevent interference between adjacent rotary tiller blades 324, a partition is also provided between adjacent rotary tiller plates 321. The partition is typically made of wear-resistant steel plate, and its thickness matches the gap between the two rotary tiller plates 321. A plurality of mounting slots 323 are evenly spaced along the circumference of the partition. The width of these mounting slots 323 is adapted to the width of the handle of the rotary tiller blade 324, and the depth is sufficient to accommodate the embedded portion of the handle. The mounting slot 323, together with the rotary tillage plates 321 on both sides, forms an installation space for inserting and positioning the handle of the rotary tillage blade 324. After the handle of the rotary tillage blade 324 is placed in the mounting slot 323, fasteners (such as high-strength bolts and lock nuts) can pass through a set of coaxial mounting holes and pre-drilled holes on the handle of the rotary tillage blade 324. Tightening the nuts generates a large clamping force, tightly connecting the handle of the rotary tillage blade 324, the separator, and the mounting plates 12 on both sides into a single unit. Each mounting slot 323 forms an independent mounting position for the rotary tillage blade 324, ensuring that multiple rotary tillage blades 324 maintain precise circumferential angles and radial positions on the same connection point, avoiding chaotic distribution of the rotary tillage blades 324 due to accumulated errors.

[0045] Reference Figure 5 and Figure 6 In some embodiments, the partition plates 322 of the multiple sets of rotary tiller blade assemblies 32 are staggered sequentially along the circumference of the rotary tiller shaft 31. The rotary tiller blades 324 are arranged in a spiral pattern. When viewed along the axial direction of the rotary tiller shaft 31, the installation position of the rotary tiller blades 324 on the subsequent connecting part is offset by a specific angle in the circumferential direction relative to the installation position of the rotary tiller blades 324 on the previous connecting part. In this embodiment, the phase difference between the blades on adjacent rotary tiller blade assemblies 32 is 10 degrees, so that the projections of all rotary tiller blades 324 installed on the shaft no longer overlap in the axial and circumferential directions. When the rotary tiller shaft 31 rotates, each rotary tiller blade 324 cuts into the soil sequentially, avoiding the huge impact load generated by all blades cutting in at the same time. This makes the cutting process more continuous and stable, significantly reduces torque fluctuation, and effectively reduces peak power consumption and impact on the transmission system. The installation angle of the rotary tiller blades 324 can be adjusted within a range of ±15 degrees to adapt to the tillage requirements of different soil conditions.

[0046] In the description of the embodiments of this utility model, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

Claims

1. A rotary tiller, characterized in that, include: The mounting bracket (1) includes a base plate (11) and mounting plates (12) disposed on both sides of the base plate (11), wherein the mounting plates (12) are provided with connecting shaft mounting components; The drive box (2) is set on the base plate (11) and located in the middle of the mounting plates (12) on both sides. The top of the drive box (2) is provided with a power input end (21) and the sides are respectively provided with power output ends (22). The power output ends (22) are coaxially arranged with the connecting shaft mounting component. The rotary tillage assembly (3) is provided in two sets. The two sets of rotary tillage assemblies (3) are respectively located between the power output end (22) on both sides of the drive box (2) and the corresponding connecting shaft mounting part. The two sets of rotary tillage assemblies (3) are coaxial and symmetrically arranged along a plane. The power output end (22) on both sides of the drive box (2) is connected to the rotary tillage assembly (3) for transmission.

2. The rotary tiller according to claim 1, characterized in that: The rotary tillage component (3) includes: Rotary tillage shaft (31), one end of which is provided with an active end (33) and the other end is provided with a driven end (34). The active end (33) is connected to the power output end (22) and the driven end (34) is connected to the coupling mounting component. Rotary tillage blade assembly (32), wherein multiple sets of rotary tillage blade assemblies (32) are provided, and the multiple sets of rotary tillage blade assemblies (32) are evenly spaced on the rotary tillage shaft (31) along the axial direction of the rotary tillage shaft (31).

3. The rotary tiller according to claim 2, characterized in that: The power output end (22) includes an output shaft (221), the cross section of which is set as a toothed structure, and a first connecting hole (222) is provided on the output shaft (221) along its own radial direction; The active end (33) includes an active sleeve (331), the cross section of the inner cavity of the active sleeve (331) is adapted to the output shaft (221), and a second connecting hole (332) adapted to the first connecting hole (222) is provided on the active sleeve (331).

4. The rotary tiller according to claim 2, characterized in that: The driven end (34) includes a fixed flange adapted to the coupling mounting component, and a bearing component is provided between the fixed flange and the rotary tillage shaft (31).

5. The rotary tiller according to claim 2, characterized in that: The rotary tiller assembly (32) includes a rotary tiller plate (321) and rotary tiller blades (324). The rotary tiller plate (321) is fixedly arranged in a direction perpendicular to the axis of the rotary tiller shaft (31). The rotary tiller plate (321) has a fixing hole (325) for fixing the rotary tiller blades (324). The rotary tiller blades (324) are arranged on the rotary tiller plate (321) through the fixing hole (325).

6. The rotary tiller according to claim 5, characterized in that: Multiple rotary tillage blades (324) are provided, and the multiple rotary tillage blades (324) are evenly spaced along the circumference of the rotary tillage plate (321).

7. The rotary tiller according to claim 6, characterized in that: Two rotary tillage plates (321) are provided, and the two rotary tillage plates (321) are arranged in parallel with a gap between them. The gap between the two rotary tillage plates (321) in the same group is adapted to the thickness of the rotary tillage blade (324).

8. The rotary tiller according to claim 7, characterized in that: The rotary tiller assembly (32) also includes a partition plate (322), which is disposed between two rotary tiller plates (321). The rotary tiller plates (321) are provided with a plurality of mounting slots (323), and a plurality of rotary tiller blades (324) are respectively disposed in the plurality of mounting slots (323).

9. The rotary tiller according to claim 8, characterized in that: The partition plates (322) of the multiple sets of rotary tillage blade assemblies (32) are staggered in sequence along the circumference of the rotary tillage shaft (31).

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