A rake blade angle adjustment mechanism
By designing a rake blade angle adjustment mechanism with a fixed frame and a rotating frame in the land preparation machine, and utilizing a combination of positioning holes and limiting slots, the problem of conventional mechanisms occupying a large space in a compact space is solved, achieving flexible adjustment and stability of the rake blade angle, and making it suitable for various working conditions of independent rake blades.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- BAZHOU WATER AGRICULTURAL MACHINERY MANUFACTURING CO LTD
- Filing Date
- 2025-06-30
- Publication Date
- 2026-05-26
AI Technical Summary
In existing tillage machines, conventional angle adjustment mechanisms occupy a large space in the compact harrow assembly structure, making them difficult to apply to the angle adjustment of independent harrow blades and limiting their applicability.
Design a rake blade angle adjustment mechanism including a fixed frame and a rotating frame. By setting multiple pairs of positioning holes on the fixed horizontal plate and the rotating horizontal plate, the rotation angle is locked by a pin shaft, and the limit slot is used to prevent exceeding the safe angle. The rotating shaft is locked with a screw with holes and a hexagonal slotted nut, so as to realize the angle adjustment in a small space.
It enables the adjustment of the rake blade angle in a small space, has a wider range of applications, and ensures the stability and flexibility of operation, meeting the adjustment requirements of 0°-16°.
Smart Images
Figure CN224267287U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of agricultural machinery technology, specifically to a harrow blade angle adjustment mechanism. Background Technology
[0002] A land preparation machine is a machine used to further refine the land after plowing or loosening. It mainly works by breaking up, leveling, and compacting the soil to make it suitable for sowing or planting. The rake blade is the most crucial working component of the land preparation machine. It breaks up soil clods, removes stubble, and loosens the surface layer by rotating, swinging, or inserting into the soil.
[0003] During operation, changes in the angle of the harrow blades alter the contact pattern between the blades and the soil, the cutting force, and the resistance to movement, thus affecting the tillage effect. To adapt to different soil types, a dedicated angle adjustment mechanism is typically designed for the harrow blades. In some tillage machine designs with compact harrow assembly structures, the shafts of the individual harrow blades are installed on the inner or outer sides of the blades. In this installation method, the space between the blades is very small, and conventional angle adjustment mechanisms occupy a large space, making them unsuitable for adjusting the angle of these blades.
[0004] In order to solve the above problems, people have been seeking an ideal technological solution. Summary of the Invention
[0005] The purpose of this utility model is to address the shortcomings of existing technologies by providing a scientifically designed, space-saving, and widely applicable rake blade angle adjustment mechanism that can be used for independent rake blade angle adjustment.
[0006] To achieve the above objectives, the technical solution adopted by this utility model is as follows: a rake blade angle adjustment mechanism, comprising a fixed frame and a rotating frame. The fixed frame includes a top frame mounting mechanism and a bottom fixed horizontal plate. The rotating frame includes a top rotating horizontal plate and a bottom rake blade mounting part. The rotating horizontal plate is attached to the bottom of the fixed horizontal plate. The fixed horizontal plate has a rotating shaft mounting hole. The rotating horizontal plate is mounted in the rotating shaft mounting hole through a rotating shaft. The rotating horizontal plate and the fixed horizontal plate have several pairs of positioning holes, each pair of positioning holes corresponding to a different rotation angle. As the rotating shaft rotates to different angles, the several pairs of positioning holes align sequentially. After locking the aligned pair of positioning holes with a pin, the angle is fixed.
[0007] Beneficial effects: By utilizing the relative rotation of the rotating horizontal plate and the fixed horizontal plate, the angle of the rake blade can be changed. After rotating to the correct position, a pair of positioning holes are aligned. A pin is then passed through the positioning holes to form two fixed points with the rotating shaft, locking the rotation angle. The rotating horizontal plate and the fixed horizontal plate can have more positioning holes in a smaller area, thereby reducing the volume of the entire angle adjustment mechanism, which is beneficial for use in small spaces.
[0008] Based on the above, both the fixed horizontal plate and the rotating horizontal plate include two oppositely arranged first long side and second long side, as well as two oppositely arranged first short side and second short side. The rotating shaft is biased towards the first long side and the first short side. Multiple pairs of positioning holes are arranged in a row near the second long side, and the remaining positioning holes are biased towards the first long side and the second short side.
[0009] Beneficial effects: The layout of the positioning holes is more compact, which helps to further reduce the size of the fixed cross plate and the rotating cross plate.
[0010] Based on the above, a total of five pairs of positioning holes are provided, with four pairs of positioning holes arranged in a row near the second long side.
[0011] Beneficial effects: Each pair of positioning holes can be spaced at a certain angle, allowing the rake blade to be adjusted within the range of 0°-16°. The five pairs of positioning holes can meet the needs of most working conditions.
[0012] Based on the above, the fixing frame also includes a limiting plate, which extends out of the bottom surface of the fixing horizontal plate, and the rotating horizontal plate has a limiting slot corresponding to the limiting plate; when the rotating horizontal plate swings, the groove wall of the limiting slot is blocked by the limiting plate, thereby playing a limiting role.
[0013] Beneficial effect: Prevents rotation beyond a safe angle.
[0014] Based on the above, the rotating shaft is a screw rod with a hole, and the mounting hole of the rotating shaft is provided with an internal thread. After the screw rod with the hole passes through the mounting hole of the rotating shaft, it is locked by a hexagonal slotted nut and a cotter pin.
[0015] Beneficial effects: After the angle is locked, the cotter pin can prevent the hexagonal slotted nut from loosening, ensuring operational stability.
[0016] Based on the above, a rake blade shaft is installed on the rake blade mounting part, and a rake blade is installed on the rake blade shaft. The cutting edge of the rake blade is set to one side of the rake blade shaft.
[0017] Beneficial effect: It can be applied to the adjustment of rake blades with the rake blade shaft located on the inside. Attached Figure Description
[0018] Figure 1This is a schematic diagram of the rake blade angle adjustment mechanism in this utility model.
[0019] Figure 2 This is a three-dimensional view of the rake blade angle adjustment mechanism of this utility model after the rake blades have been removed.
[0020] Figure 3 This is a side view of the rake blade angle adjustment mechanism of this utility model after the rake blades have been removed.
[0021] Figure 4 This is a top view of the rake blade angle adjustment mechanism of this utility model after the rake blades have been removed.
[0022] Figure 5 This is a bottom view of the rake blade angle adjustment mechanism of this utility model after the rake blades have been removed.
[0023] In the diagram: 1. Frame mounting mechanism; 2. Fixed horizontal plate; 3. Limiting vertical plate; 4. Rotating horizontal plate; 5. Rake blade mounting part; 6. Rotating shaft; 7. Rake blade rotating shaft; 8. Rake blade; 9. Positioning hole; 10. Hexagonal slotted nut; 11. Cotter pin; 12. Limiting slot. Detailed Implementation
[0024] The technical solution of this utility model will be further described in detail below through specific embodiments.
[0025] like Figure 1-5 As shown, a rake blade angle adjustment mechanism includes a fixed frame and a rotating frame. The fixed frame includes a frame mounting mechanism 1 at the top and a fixed horizontal plate 2 at the bottom. The frame mounting mechanism 1 is used to install onto the frame of a land preparation machine. The rotating frame includes a rotating horizontal plate 4 at the top and a rake blade mounting part 5 at the bottom. A rake blade rotating shaft 7 is installed on the rake blade mounting part 5, and a rake blade 8 is installed on the rake blade rotating shaft 7. The cutting edge of the rake blade 8 is offset towards one side of the rake blade rotating shaft 7, that is, the rake blade rotating shaft 7 is located inside the rake blade 8.
[0026] The rotating horizontal plate 4 is attached to the bottom of the fixed horizontal plate 2. The fixed horizontal plate 2 has a rotating shaft mounting hole. The rotating horizontal plate 4 is installed in the rotating shaft mounting hole through a rotating shaft 6. By rotating the rotating shaft 6, the rotating horizontal plate 4, the rake plate mounting part 5, and the rake plate 8 can be rotated together, changing the angle of the rake plate 8.
[0027] In this embodiment, five pairs of positioning holes 9 are provided on the rotating horizontal plate 4 and the fixed horizontal plate 2. Each pair of positioning holes 9 corresponds to a different rotation angle. As the rotating shaft 6 rotates to different angles, the five pairs of positioning holes 9 align sequentially. After the aligned pair of positioning holes 9 is locked with a pin, the angle is fixed. The rake blade can be adjusted within the range of 0°-16°. The five pairs of positioning holes 9 can meet the needs of most working conditions. In other embodiments, the number of positioning holes 9 can be increased or decreased, and the angle interval corresponding to each pair of positioning holes 9 can be changed, so that the rake blade can be adjusted more finely or more sparsely within the range of 0°-16°.
[0028] The rotating shaft 6 is specifically a threaded rod with a hole. The mounting hole of the rotating shaft has an internal thread. After passing through the mounting hole, the threaded rod is locked in place by a hexagonal slotted nut 10 and a cotter pin 11 (the cotter pin 11 is only used when...). Figure 4 (As shown in the diagram) When rotation is required, pull the cotter pin 11 out of the hole of the screw rod, loosen the hexagonal slotted nut 10 slightly, and the screw rod can rotate. After rotation to the correct position, tighten the hexagonal slotted nut 10 and insert the cotter pin 11 into the hole of the screw rod to prevent the hexagonal slotted nut 10 from loosening and ensure operational stability.
[0029] Working principle:
[0030] When the angle needs to be adjusted, first remove the cotter pin 11, loosen the hexagonal slotted nut 10, rotate the shaft 6 to rotate the rake blade 8 to the target angle, aligning a pair of positioning holes 9, and use a pin to pass through the positioning holes 9 to form two fixed points with the shaft 6 to lock the rotation angle. Finally, tighten the hexagonal slotted nut 10 and install the cotter pin 11 to prevent the hexagonal slotted nut 10 from loosening, thus completing the angle adjustment.
[0031] In this patent, the rotating horizontal plate 1 and the fixed horizontal plate 2 can open more positioning holes 9 in a smaller area, thereby reducing the volume of the entire angle adjustment mechanism and making it suitable for use in small spaces.
[0032] To achieve a more compact structure, both the fixed horizontal plate 2 and the rotating horizontal plate 4 include two opposing first long sides and second long sides, as well as two opposing first short sides and second short sides. The first long side is closer to the rake blade 8, and the second long side is farther from the rake blade 8. The first short side is located at the rear end, and the second short side is located at the front end. The rotating shaft 6 is offset towards the first long and first short sides. Four pairs of positioning holes 9 are arranged in a row near the second long side, and one pair of positioning holes 9 is offset towards the first long and second short sides. This more compact layout of the positioning holes 9 helps to further reduce the size of the fixed horizontal plate 2 and the rotating horizontal plate 4.
[0033] To prevent rotation from exceeding the required angle range, the fixing frame also includes a limiting plate 3, which extends out of the bottom surface of the fixing horizontal plate 2. The rotating horizontal plate 4 has a limiting slot 12 corresponding to the limiting plate 3. When the rotating horizontal plate 4 swings, the groove wall of the limiting slot 12 is blocked by the limiting plate 3, thereby playing a limiting role.
[0034] In other embodiments, the cutting edge of the rake blade 8 can also be positioned opposite to the rake blade shaft 7, that is, the rake blade shaft 7 is located outside the rake blade 8, and can also be adjusted using the rake blade angle adjustment mechanism.
[0035] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of this utility model and not to limit it; although the utility model has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications can still be made to the specific implementation of this utility model or equivalent substitutions can be made to some technical features without departing from the spirit of the technical solution of this utility model, and all such modifications and substitutions should be covered within the scope of the technical solution claimed by this utility model.
Claims
1. A rake blade angle adjustment mechanism, characterized in that: The system includes a fixed frame and a rotating frame. The fixed frame includes a top frame mounting mechanism and a bottom fixed cross plate. The rotating frame includes a top rotating cross plate and a bottom rake blade mounting part. The rotating cross plate is attached to the bottom of the fixed cross plate. The fixed cross plate has a rotating shaft mounting hole. The rotating cross plate is mounted in the rotating shaft mounting hole through a rotating shaft. The rotating cross plate and the fixed cross plate have several pairs of positioning holes, each pair of positioning holes corresponding to a different rotation angle. As the rotating shaft rotates to different angles, the several pairs of positioning holes align sequentially. After locking the aligned pair of positioning holes with a pin, the angle is fixed.
2. The rake blade angle adjustment mechanism according to claim 1, characterized in that: Both the fixed horizontal plate and the rotating horizontal plate include two oppositely arranged first long side and second long side, as well as two oppositely arranged first short side and second short side. The rotating shaft is biased towards the first long side and the first short side. Multiple pairs of positioning holes are arranged in a row near the second long side, and the remaining positioning holes are biased towards the first long side and the second short side.
3. The rake blade angle adjustment mechanism according to claim 2, characterized in that: There are five pairs of positioning holes, with four pairs arranged in a row near the second long side.
4. The rake blade angle adjustment mechanism according to any one of claims 1-3, characterized in that: The fixing frame also includes a limiting plate, which extends out of the bottom surface of the fixing horizontal plate. The rotating horizontal plate has a limiting slot corresponding to the limiting plate. When the rotating horizontal plate swings, the groove wall of the limiting slot is blocked by the limiting plate, thereby playing a limiting role.
5. The rake blade angle adjustment mechanism according to claim 4, characterized in that: The rotating shaft is a screw rod with a hole. The mounting hole of the rotating shaft is provided with an internal thread. After the screw rod with the hole passes through the mounting hole of the rotating shaft, it is locked by a hexagonal slotted nut and a cotter pin.
6. The rake blade angle adjustment mechanism according to any one of claims 1, 2, 3 and 5, characterized in that: The rake blade mounting part is equipped with a rake blade shaft, and the rake blade is mounted on the rake blade shaft. The cutting edge of the rake blade is set to one side of the rake blade shaft.