Grass winding prevention cutter for rotary cultivator

Abstract

The utility model discloses an anti-grass-winding cutter for a rotary cultivator, which comprises a cutter body and a cutter handle which are integrally formed and are L-shaped. The knife body comprises a knife back part and a knife edge part, a first cutting groove, a second cutting groove and an intercepting groove are sequentially formed along the knife edge part from the end, away from the knife handle, of the knife back part, the first cutting groove, the second cutting groove and the intercepting groove are arc-shaped grooves, and the first cutting groove and the second cutting groove are in smooth transition connection; the second cutting grooves and the intercepting grooves are arranged at intervals; a mounting groove is formed in the cutter handle, a first mounting hole and a second mounting hole are formed in the two sides of the mounting groove, the first mounting hole is formed in the end, close to the cutting edge part, of the cutter handle, and the second mounting hole is formed in the end, away from the cutting edge part, of the cutter handle. The two continuous arc-shaped cutting grooves are formed in the cutting edge part, weeds are cut off sequentially through the first cutting grooves and the second cutting grooves after ground breaking, the remaining uncut weeds are intercepted through the intercepting grooves, and the weed cutter can efficiently cut off the weeds when being used for weeding operation of soil with high hardness and high viscidity.

Description

Technical Field

[0001] This utility model relates to the field of rotary tiller blade technology, and more specifically to a rotary tiller blade for preventing weed entanglement. Background Technology

[0002] Before sowing in existing farmland, it is necessary to remove weeds and perform rotary tillage. Currently, rotary tillers are commonly used. Rotary tillers are equipped with rotary blades, which are blade-shaped and can clear weeds from the farmland. At the same time, they can loosen the soil by rotary tillage, break up the plow pan, restore the soil's granular structure, improve the soil's water retention capacity, and provide a good seedbed for later sowing.

[0003] Most rotary tillers currently on the market use a bushing with several rotary tiller blades. For general soil, traditional rotary tiller blades often cause weeds to entangle the blade shaft when working in damp, weed-dense environments due to the simple blade structure, leading to power loss, uneven tillage depth, and even blade breakage and equipment jamming.

[0004] To address the aforementioned problems, a rotary tiller (CN218302105U) discloses a rotary tiller blade, comprising a handle with mounting holes and a blade body. The blade body includes a handle connecting section connected to the handle, with raised ribs on both sides of the handle connecting section. The raised ribs are convex ridge structures. The handle connecting section connects to a first inclined connecting section, with the angle between the handle connecting section and the first inclined connecting section being 145-155°. A second inclined connecting section has an angle of 65-75° between the first and second inclined connecting sections, with the end of the second inclined connecting section having a bevel inclined towards the first inclined connecting section to form a blade head. The first and second inclined connecting sections have a smooth arc transition, with the arc transition radius being 25-30mm. While this structure increases the overall strength of the blade body by incorporating raised ribs, the single arc-shaped blade cannot effectively cut tough weeds.

[0005] For example, a rotary tiller blade and blade assembly for weeding (CN220422887U) discloses a rotary tiller blade and blade assembly for weeding. The rotary tiller blade includes: a handle and a blade body connected to the handle. A mounting hole is provided on the handle. The blade body includes a back edge and a cutting edge. Cutting teeth and cutting grooves are continuously and alternately arranged along the cutting edge. A cutting groove is provided at the end of the cutting edge near the handle, and cutting teeth are provided at the end of the cutting edge away from the handle. The blade body bends towards the back edge in the direction opposite to its direction of movement. The blade body also bends towards the handle in a direction perpendicular to its direction of movement. The cutting groove is an arc-shaped groove. This invention, by setting the cutting edge into a toothed shape by continuously and alternately setting cutting teeth and cutting grooves along the cutting edge, is suitable for soil with many weeds and strong weeds. However, the toothed blade is easily damaged by harder soil clods.

[0006] In summary, when existing rotary tiller blades are used for weeding in soils with high hardness and strong viscosity, the simple blade structure often leads to weeds entangled in the blade shaft, causing problems such as power loss, uneven tillage depth, and even blade breakage and equipment jamming, which affect tillage efficiency and the service life of the blades. Utility Model Content

[0007] The purpose of this utility model is to provide a rotary tiller blade that prevents weeds from getting tangled in the blade shaft when rotary tiller blades are used for weeding in soils with high hardness and strong viscosity. This is because the blade structure is simple and often leads to weeds getting tangled in the blade shaft, causing power loss, uneven tillage depth, or even blade breakage and equipment jamming.

[0008] The technical solution adopted in this utility model is as follows:

[0009] A rotary tiller blade for preventing weed entanglement includes an integrally formed blade body and handle, wherein the blade body and handle are L-shaped;

[0010] The blade includes a back and a cutting edge. The cutting edge is located on the side away from the handle. Starting from the end away from the handle, a first cutting groove, a second cutting groove, and an intercepting groove are sequentially arranged along the cutting edge. The first cutting groove, the second cutting groove, and the intercepting groove are arc-shaped grooves. The first cutting groove and the second cutting groove are smoothly connected. The second cutting groove and the intercepting groove are spaced apart. The length of the intercepting groove is less than the length of the first cutting groove and the second cutting groove.

[0011] A mounting groove is provided on the handle, and a first mounting hole and a second mounting hole are provided on both sides of the mounting groove. The first mounting hole is located at the end of the handle near the blade, and the second mounting hole is located at the end of the handle away from the blade.

[0012] Preferably, the first cutting groove and the second cutting groove have the same length, and the length of the intercepting groove is greater than 1 / 4 of the length of the first cutting groove and less than 3 / 4 of the length of the first cutting groove.

[0013] Preferably, the second cutting groove includes a first cutting groove and a second cutting groove, the first cutting groove and the second cutting groove are smoothly connected, the second cutting groove is located on the side close to the handle, the curvature of the first cutting groove is less than the curvature of the second cutting groove, and the arc length of the first cutting groove is greater than the arc length of the second cutting groove.

[0014] The intercepting groove includes a first intercepting groove and a second intercepting groove. The first intercepting groove and the second intercepting groove are smoothly connected. The second intercepting groove is located on the side closer to the handle. The curvature of the first intercepting groove is less than that of the second intercepting groove, and the arc length of the first intercepting groove is greater than that of the second intercepting groove.

[0015] Preferably, the curvature ratio of the first cutting groove to the curvature ratio of the second cutting groove is 0.25 to 0.5;

[0016] The ratio of the arc length of the first cutting groove to the arc length of the second cutting groove is 1.5 to 3.0.

[0017] The curvature ratio of the first intercepting groove to the curvature ratio of the second intercepting groove is 0.25 to 0.5.

[0018] The ratio of the arc length of the first intercepting groove to the arc length of the second intercepting groove is 1.5 to 3.0.

[0019] Preferably, the second cutting groove is spaced 5-15 mm apart from the intercepting groove.

[0020] Preferably, the end of the blade away from the handle is bent toward the handle along a plane perpendicular to the direction of blade movement, with a bending angle of 30~60°.

[0021] Preferably, the angle between the line connecting the centers of the first mounting hole and the second mounting hole and the horizontal line along the length of the handle is an acute angle, and the vertical distance from the center of the first mounting hole to the blade is less than the vertical distance from the center of the second mounting hole to the blade.

[0022] Preferably, the angle between the line connecting the centers of the first mounting hole and the second mounting hole and the horizontal line along the length of the tool holder is 10~30°.

[0023] Preferably, the mounting groove is an arc-shaped groove.

[0024] Compared with the prior art, the beneficial effects of this utility model are:

[0025] The rotary tiller's blades have two continuous arc-shaped cutting grooves on the cutting edge. The first cutting groove near the top of the blade forms a tip that can effectively break through the soil. After breaking through the soil, weeds are cut through the first and second cutting grooves in sequence. The remaining uncut weeds are intercepted by the interception groove to prevent the weeds from moving towards the handle. When used for weeding in soils with high hardness and strong stickiness, it can efficiently cut weeds.

[0026] Traditional rotary tillers have an angle of nearly 180 degrees between the blade and the mounting hole, resulting in greater stress on the connection hole near the blade, which can easily lead to loosening and damage of bolts. This rotary tiller features an L-shaped blade and handle, with two mounting holes on the handle. The line connecting the centers of these mounting holes forms an angle of nearly 90 degrees with the blade, significantly reducing the stress on the first mounting hole near the blade. Therefore, when tilling hard, sticky soils, the two mounting holes not only secure the handle but also disperse the force concentrated on the mounting hole near the blade, making the rotary tiller more stable and less prone to loosening during operation. Attached Figure Description

[0027] To more clearly illustrate the technical solutions of the embodiments of this disclosure, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this disclosure and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained from these drawings without creative effort.

[0028] Figure 1 This is a three-dimensional structural diagram of a rotary tiller blade for preventing grass entanglement, provided as an embodiment of the present utility model.

[0029] Figure 2 A front view of a rotary tiller blade for preventing grass entanglement, provided in an embodiment of this utility model.

[0030] Figure 3 This is a schematic diagram of the two-section cutting groove and intercepting groove structure provided in an embodiment of the present utility model.

[0031] Figure 4 A three-dimensional structural schematic diagram of another anti-grass-tangling rotary tiller blade provided in an embodiment of this utility model.

[0032] Figure 5 This is a schematic diagram showing the positioning of the first mounting hole and the second mounting hole provided in an embodiment of the present utility model.

[0033] 1. Blade; 2. Handle; 3. Back of blade; 4. Blade edge; 41. First cutting groove; 42. Second cutting groove; 421. First-stage cutting groove; 422. Second-stage cutting groove; 43. Interception groove; 431. First-stage interception groove; 432. Second-stage interception groove; 5. First mounting hole; 6. Second mounting hole; 7. Mounting groove. Detailed Implementation

[0034] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0035] In the description of this utility model, it should be noted that the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance. In the description of this utility model, it should be noted that unless otherwise explicitly specified and limited, the terms "connection" and "setting" 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 based on the specific circumstances. The embodiments of this utility model will now be described based on its overall structure.

[0036] To address the problems existing in current rotary tillers, such as Figure 1 and Figure 2 As shown, this embodiment provides a rotary tiller blade for preventing weed entanglement, including an integrally formed blade body 1 and handle 2, which are L-shaped. The blade body 1 includes a back 3 and a cutting edge 4. The cutting edge 4 is located on the side away from the handle 2. Along the cutting edge 4, starting from the end away from the handle 3, a first cutting groove 41, a second cutting groove 42, and an intercepting groove 43 are sequentially provided. The first cutting groove 41, the second cutting groove 42, and the intercepting groove 43 are arc-shaped grooves. The first cutting groove 41 and the second cutting groove 42 are smoothly connected. The second cutting groove 42 and the intercepting groove 43 are spaced apart. The length of the intercepting groove 43 is less than the length of the first cutting groove 41 and the second cutting groove 42. A mounting groove 7 is provided on the handle 2. A first mounting hole 5 and a second mounting hole 6 are provided on both sides of the mounting groove 7. The first mounting hole 5 is located on the handle 2 near the cutting edge 4, and the second mounting hole 6 is located on the handle 2 away from the cutting edge 4.

[0037] The rotary tiller blade in this embodiment has two continuous arc-shaped cutting grooves on the blade part 4, namely the first cutting groove 41 and the second cutting groove 42. The first cutting groove 41 near the top of the blade body 1 forms a blade tip at the top of the blade body 1 that can effectively break the soil. After breaking the soil, the weeds are cut through the first cutting groove 41 and the second cutting groove 42 in sequence. The weeds are effectively cut through two cuts. The remaining small amount of uncut weeds are intercepted by the interception groove 43 to prevent the weeds from moving to the handle. When used for weeding in soil with high hardness and strong stickiness, it can efficiently cut the weeds.

[0038] In this embodiment, the blade 1 and handle 2 are L-shaped. Two mounting holes are provided on the handle 2, namely the first mounting hole 5 and the second mounting hole 6. The line connecting the centers of the two mounting holes forms an angle of nearly 90° with the blade 1. This significantly reduces the force on the first mounting hole 5 near the blade 1 compared to the force on the mounting hole near the blade on a traditional rotary tiller. Therefore, when tilling soils with high hardness and strong viscosity, the L-shaped rotary tiller fixes the handle 2 through the two mounting holes while dispersing the force concentrated on the mounting hole (first mounting hole 5) near the blade, making the rotary tiller more stable and less prone to loosening during operation.

[0039] In order to effectively cut weeds while improving the blade's ability to intercept weeds, such as Figure 1 As shown, the first cutting groove 41 and the second cutting groove 42 have the same length, and the length of the intercepting groove 43 is greater than 1 / 4 of the length of the first cutting groove 41 and less than 3 / 4 of the length of the first cutting groove 41.

[0040] In this embodiment, the first cutting groove 41 and the second cutting groove 42 have the same length, occupying most of the length of the entire blade. Most of the weeds can be cut through two cuts, and a small portion of the weeds are intercepted by the interception groove 43 located at the end of the blade 4.

[0041] In the process of cultivating soil with a lot of weeds, in order to prevent weeds from entering the handle from the blade, a special interception groove is set in the blade to intercept the weeds. In order to enhance the interception efficiency of weeds, the structure of the second cutting groove 41 and the interception groove 43 has been optimized in this embodiment.

[0042] like Figure 3 As shown, the second cutting groove 42 includes a first cutting groove 421 and a second cutting groove 422. The first cutting groove 421 and the second cutting groove 422 are smoothly connected. The second cutting groove 422 is located on the side close to the handle 2. The curvature of the first cutting groove 421 is less than the curvature of the second cutting groove 422, and the arc length of the first cutting groove 421 is greater than the arc length of the second cutting groove 422.

[0043] The intercepting groove 43 includes a first intercepting groove 431 and a second intercepting groove 432. The first intercepting groove 431 and the second intercepting groove 432 are smoothly connected. The second intercepting groove 432 is located on the side closer to the handle 2. The curvature of the first intercepting groove 431 is less than the curvature of the second intercepting groove 432, and the arc length of the first intercepting groove 431 is greater than the arc length of the second intercepting groove 432.

[0044] In this embodiment, the weeds that are not cut by the first cutting groove 41 enter the second cutting groove 42. The second cutting groove 42 is composed of a first cutting groove 421 with different curvatures and lengths and a second cutting groove 422. The first cutting groove 421 has a smaller curvature and a longer arc length, and is mainly used for cutting weeds. The second cutting groove 422, which is closer to the handle 2, has a larger curvature and a shorter arc length, and is mainly used for intercepting weeds to prevent them from moving to the interception groove 43. Similarly, the interception groove 43 is composed of a first interception groove 431 with different curvatures and lengths and a second interception groove 432. The first interception groove 431 cuts the weeds, and the second interception groove 432 performs the final interception to prevent the weeds from moving to the handle.

[0045] Specifically, the dimensions of the second cutting groove and the intercepting groove are:

[0046] The curvature ratio of the first cutting groove 421 to the curvature ratio of the second cutting groove 422 is 0.25~0.5;

[0047] The ratio of the arc length of the first cutting groove 421 to the arc length of the second cutting groove 422 is 1.5 to 3.0;

[0048] The curvature ratio of the first interception groove 431 to the curvature ratio of the second interception groove 432 is 0.25~0.5;

[0049] The ratio of the arc length of the first interception groove 431 to the arc length of the second interception groove 432 is 1.5 to 3.0.

[0050] To prevent weeds from entering the handle 2, the second cutting groove 42 and the intercepting groove 43 are spaced 5~15mm apart. By setting the second cutting groove 42 and the intercepting groove 43 at intervals, weeds can be cut again through the interval area between the second cutting groove 42 and the intercepting groove 43, preventing weeds from accumulating and tangling.

[0051] To improve the soil-turning ability of this tool, such as Figure 4 As shown, the end of the blade 1 away from the handle 2 bends towards the handle 2 along a plane perpendicular to the direction of movement of the blade 1, with a bending angle of 30~60°.

[0052] In this embodiment, compared with the straight design, the curved blade 1 structure design not only improves the blade's ability to cut grass along its direction of movement, but also improves the blade's ability to turn over soil.

[0053] For weeds with deep roots, deep tillage is required. The depth of the rotary tiller blade can be increased by increasing the curvature of the blade 1. For weeds with shallow roots, or in orchards where the rotary tiller blade needs to be inserted into the soil less deeply to avoid damaging the fruit tree roots, the curvature of the blade 1 can be reduced to allow the rotary tiller blade to be inserted into the soil less deeply.

[0054] On the other hand, since the blade 1 and handle 2 of the rotary tiller are L-shaped, the rotary tiller is fixed by the first mounting hole 5 and the second mounting hole 6 located on both sides of the mounting groove 7. During the operation of the rotary tiller, the middle part of the handle 2 is under stable force, which effectively avoids the occurrence of handle breakage.

[0055] Meanwhile, during use, it was found that the first mounting hole 5 and the second mounting hole 6 located on both sides of the mounting groove 7 were subjected to different forces during tillage. The first mounting hole 5, which is closer to the blade 4, was subjected to greater force, while the second mounting hole 6, which is farther away from the blade 4, was subjected to less force. Therefore, the first mounting hole 5 experienced greater wear and was more prone to damage. In order to increase the stability of the rotary tiller and effectively avoid damage to the handle due to uneven force on the two mounting holes, in this embodiment, the first mounting hole 5 and the second mounting hole 6 are asymmetrically arranged. Specifically, the angle between the line connecting the centers of the first mounting hole 5 and the second mounting hole 6 and the horizontal line along the length of the handle 2 is an acute angle, and the vertical distance from the center of the first mounting hole 5 to the blade 1 is less than the vertical distance from the center of the second mounting hole 6 to the blade 1.

[0056] In this embodiment, the rotary tiller blades can be fixed in both the horizontal and vertical directions through the asymmetrical mounting hole structure design, thereby increasing the stability of the rotary tiller blades.

[0057] To improve the stability of the rotary tiller blade, the centers of the first mounting hole 5 and the second mounting hole 6 on the handle 2 are not on the same straight line. The angle between the line connecting the centers of the first mounting hole 5 and the second mounting hole 6 and the horizontal line along the length of the handle 2 is an acute angle. Figure 5 As shown, the angle between the line connecting the centers of the first mounting hole 5 and the second mounting hole 6 and the horizontal line along the length of the tool holder 2 is . α , α The size is positively correlated with the size of the connecting shaft; when the connecting shaft is smaller... α When the connecting shaft is smaller, α Specifically, the angle between the line connecting the centers of the first mounting hole 5 and the second mounting hole 6 and the horizontal line along the length of the tool holder 2 is 10~30°.

[0058] The mounting groove 7 is mainly used to connect with the central shaft or bushing. The appropriate shape can be selected according to the usage conditions. In this embodiment, the mounting groove 7 is an arc-shaped groove. This structure of the mounting groove 23 can be applied to cylindrical shafts and hexagonal shafts, etc.

[0059] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

Claims

1. A rotary tiller blade for preventing weed entanglement, characterized in that, It includes an integrally formed blade (1) and handle (2), wherein the blade (1) and handle (2) are L-shaped; The blade (1) includes a back (3) and a cutting edge (4). The cutting edge (4) is located on the side away from the handle (2). Along the cutting edge (4), starting from the end away from the handle (2), a first cutting groove (41), a second cutting groove (42), and an intercepting groove (43) are arranged in sequence. The first cutting groove (41), the second cutting groove (42), and the intercepting groove (43) are arc-shaped grooves. The first cutting groove (41) and the second cutting groove (42) are smoothly connected. The second cutting groove (42) and the intercepting groove (43) are spaced apart. The length of the intercepting groove (43) is less than the length of the first cutting groove (41) and the second cutting groove (42). A mounting groove (7) is provided on the handle (2), and a first mounting hole (5) and a second mounting hole (6) are provided on both sides of the mounting groove (7). The first mounting hole (5) is located on the handle (2) at one end close to the blade (4), and the second mounting hole (6) is located on the handle (2) at one end away from the blade (4).

2. The knife for a rotary cultivator according to claim 1, characterized in that The first cutting groove (41) and the second cutting groove (42) have the same length. The length of the intercepting groove (43) is greater than 1 / 4 of the length of the first cutting groove (41) and less than 3 / 4 of the length of the first cutting groove (41).

3. The knife for a rotary tiller according to claim 1, wherein The second cutting groove (42) includes a first cutting groove (421) and a second cutting groove (422). The first cutting groove (421) and the second cutting groove (422) are smoothly connected. The second cutting groove (422) is located on the side close to the handle (2). The curvature of the first cutting groove (421) is less than the curvature of the second cutting groove (422), and the arc length of the first cutting groove (421) is greater than the arc length of the second cutting groove (422). The intercepting groove (43) includes a first intercepting groove (431) and a second intercepting groove (432). The first intercepting groove (431) and the second intercepting groove (432) are smoothly connected. The second intercepting groove (432) is located on the side close to the handle (2). The curvature of the first intercepting groove (431) is less than the curvature of the second intercepting groove (432), and the arc length of the first intercepting groove (431) is greater than the arc length of the second intercepting groove (432).

4. The knife for a rotary cultivator according to claim 3, characterized in that The curvature ratio of the first cutting groove (421) to the curvature ratio of the second cutting groove (422) is 0.25~0.5; The ratio of the arc length of the first cutting groove (421) to the arc length of the second cutting groove (422) is 1.5 to 3.0; The curvature ratio of the first intercepting groove (431) to the curvature ratio of the second intercepting groove (432) is 0.25~0.5; The ratio of the arc length of the first intercepting groove (431) to the arc length of the second intercepting groove (432) is 1.5 to 3.

0.

5. The knife for a rotary tiller according to claim 1, wherein The second cutting groove (42) is spaced 5~15mm apart from the intercepting groove (43).

6. The rotary tiller blade for preventing weed entanglement according to claim 1, characterized in that, The end of the blade (1) away from the handle (2) bends toward the handle (2) along a plane perpendicular to the direction of movement of the blade (1), with a bending angle of 30~60°.

7. The knife for a rotary tiller that prevents grass from being entangled according to claim 1, wherein The angle between the line connecting the centers of the first mounting hole (5) and the second mounting hole (6) and the horizontal line along the length of the handle (2) is an acute angle, and the vertical distance from the center of the first mounting hole (5) to the blade (1) is less than the vertical distance from the center of the second mounting hole (6) to the blade (1).

8. The knife for a rotary cultivator according to claim 7, characterized in that The angle between the line connecting the centers of the first mounting hole (5) and the second mounting hole (6) and the horizontal line along the length of the tool holder (2) is 10~30°.

9. The knife for a rotary tiller according to claim 1, wherein The mounting groove (7) is an arc-shaped groove.

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