Agricultural machine rotary tillage tool shaft

Abstract

The utility model discloses a kind of agricultural machinery rotary tiller blade shaft, it is related to rotary tiller accessory technical field;Purpose is under the premise of not reducing the efficiency of ploughing, increase the manufacturing convenience of rotary tiller blade, to reduce cost further, propose the following technical scheme: including pivot and the multiple fixed plates of interval setting on it, at least one pair of L-shaped first blade is arranged on the side of fixed plate, and first blade is symmetrically arranged about pivot axis;At least one pair of L-shaped second blade is arranged on the other side of fixed plate, and second blade is symmetrically arranged about pivot axis;The cutting portion of first blade is located in the same rotation plane parallel with pivot axis, and the cutting portion of second blade is also located in the same rotation plane parallel with pivot axis.The utility model not only reduces the dependence on precision mould and single-piece cost, but also improves production efficiency and material utilization.

Description

Technical Field

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

[0002] Rotary tillers are tillage machines that work in conjunction with tractors to perform tilling and harrowing operations. They are widely used because of their strong soil-breaking ability and the flat surface they leave after tilling; at the same time, they can chop up the stubble buried below the surface, making it easier for seeders to operate and providing a good seedbed for later sowing.

[0003] Rotary tillers rotate under power by rotating blades while moving forward in a straight line. The blades cut into the soil and throw the cut soil clods, which are further broken up and dragged to flatten the ground after colliding with the retaining plate.

[0004] Most rotary tillers currently use a spiral-curved blade design, such as the CN223364511U rotary tiller blade and rotary tillage device. This includes a fixedly connected handle and a first blade. A curved second blade is located near the handle of the first blade. The first blade is a forward-curved blade. While this design can increase soil-digging efficiency during rotary tillage, the curve design of the forward-curved blade requires complex manufacturing processes such as material preparation, forging, heat treatment, and grinding. This results in a reliance on precision molds and higher unit costs, reducing production efficiency and material utilization. Utility Model Content

[0005] This utility model provides a rotary tiller blade shaft for agricultural machinery, with the aim of increasing the ease of manufacturing rotary tiller blades without reducing tillage efficiency, thereby reducing costs.

[0006] The technical solution of this utility model to solve the above-mentioned technical problems is as follows:

[0007] A rotary tiller shaft for agricultural machinery includes a rotating shaft and a plurality of fixed plates spaced apart thereon. At least one pair of L-shaped first blades are provided on one side of the fixed plates, and the first blades are symmetrically arranged about the axis of the rotating shaft. At least one pair of L-shaped second blades are provided on the other side of the fixed plates, and the second blades are symmetrically arranged about the axis of the rotating shaft. The cutting portions of the first blades are located in the same plane of rotation parallel to the axis of the rotating shaft, and the cutting portions of the second blades are also located in the same plane of rotation parallel to the axis of the rotating shaft.

[0008] Furthermore, the first blade includes two sets, one set of first blades is disposed on one side of the fixed plate and the other set of first blades is disposed on the other side of the fixed plate, and the bending directions of the two sets of first blades are opposite; the second blade includes two sets, one set of second blades is disposed on one side of the fixed plate and the other set of second blades is disposed on the other side of the fixed plate, and the bending directions of the two sets of second blades are opposite.

[0009] Furthermore, the connecting end of the first blade is provided with a first shank, which is detachably mounted on the fixed plate.

[0010] Furthermore, the connecting end of the second blade is provided with a second shank, which is detachably mounted on the fixed plate.

[0011] Furthermore, when projected onto a plane perpendicular to the axis of rotation, the angle between the centerline of the first tool holder and the centerline of the second tool holder is 0 to 15 degrees.

[0012] Furthermore, the height of the cutting portion of the first blade is greater than the height of the cutting portion of the second blade.

[0013] This utility model has the following beneficial effects:

[0014] This invention features a standardized L-shaped blade design. Compared to traditional forward-leaning curved blades that require complex three-dimensional forming, the two-dimensional geometry of the L-shaped blade greatly simplifies the entire process, including blanking, forging, heat treatment, and grinding. This not only reduces reliance on precision molds and unit costs but also improves production efficiency and material utilization, laying the foundation for high-performance, cost-effective, and large-scale manufacturing of the blades.

[0015] All L-shaped blades in this invention are arranged symmetrically around the axis of rotation, ensuring a highly uniform mass distribution on the blade shaft. This design significantly reduces operating vibration and noise, improving operational comfort and effectively mitigating fatigue damage to the transmission system and bearings, thus extending the overall machine's service life. In terms of use, maintenance, and adaptability, a modular design concept is consistently applied. The blades are detachably mounted on the fixed plate via the blade holder, making individual blade replacement quick and easy, significantly reducing maintenance costs and downtime. The standardized L-shaped blades offer excellent interchangeability. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the overall structure of the rotary tiller shaft of this utility model.

[0017] Figure 2 A front view of a single tool axis;

[0018] Figure 3 This is a schematic diagram of the combined structure of the rotating shaft and the fixed plate.

[0019] Figures 1 to 3 The reference numerals in the attached drawings are respectively: 1. Rotating shaft; 2. First blade; 3. Second blade; 4. Fixing plate; 5. First tool holder; 6. Second tool holder. Detailed Implementation

[0020] The present invention will be further described below with reference to the accompanying drawings and embodiments:

[0021] Please refer to Figure 1-3 This embodiment describes in detail an agricultural machinery rotary tiller shaft, including a rotating shaft 1 and a plurality of fixing plates 4 spaced apart thereon. At least one pair of L-shaped first blades 2 are provided on one side of the fixing plates 4, and the first blades 2 are symmetrically arranged about the axis of the rotating shaft 1. At least one pair of L-shaped second blades 3 are provided on the other side of the fixing plates 4, and the second blades 3 are symmetrically arranged about the axis of the rotating shaft 1. The cutting part of the first blade 2 is located in the same rotational plane parallel to the axis of the rotating shaft 1, and the cutting part of the second blade 3 is also located in the same rotational plane parallel to the axis of the rotating shaft 1.

[0022] The rotating shaft 1 is the fundamental support and power transmission component of the entire rotary tiller shaft. It is made of metal to ensure it can withstand the enormous torque and bending stresses during rotary tillage operations. The rotating shaft 1 has a long cylindrical structure, with both ends reliably connected to the rotary tiller's power take-off mechanism, thereby transmitting the tractor's power to the entire shaft. The axial length of the rotating shaft 1 depends on the rotary tiller's working width; it can be integrally formed or assembled in sections using couplings.

[0023] The fixing plate 4 is a key component for mounting the blade. Multiple fixing plates 4 are fixedly installed at predetermined intervals along the axial length of the rotating shaft 1. The fixing plate 4 can be fixed to the rotating shaft 1 in various ways, for example, by welding to form a permanent connection; or preferably, by detachable fixing with bolts or locking sleeves, facilitating transportation, maintenance, and replacement. The fixing plate 4 itself has sufficient thickness and rigidity to resist the enormous reaction force generated by the blade when cutting the soil, preventing plastic deformation or breakage. The shape of the fixing plate 4 can be circular, polygonal (such as hexagonal), or other shapes.

[0024] The first blades 2 are the main soil cutting elements, and they are arranged in pairs on one side of the fixed plate 4. The term "pair" here refers to the two first blades 2 being arranged symmetrically about the axis of rotation 1; that is, the two blades are mirror-symmetrical with respect to this axis. This symmetrical arrangement ensures good dynamic balance of the cutter shaft during high-speed rotation, reduces vibration and noise, and extends the service life of bearings and transmission components. Each first blade 2 is L-shaped, including a connecting part for installation and a curved cutting part for cutting the soil, forming a distinct bending angle between them.

[0025] The second blade 3, similar to the first blade 2, is also arranged in pairs and symmetrically about the axis of rotation 1, and they are also located on the same side of the first blade 2. Each second blade 3 is also L-shaped. With the first blade 2 and the second blade 3 located on the same side of the fixing plate 4, when the first blade 2 rotates to dig, the second blade 3 can cut the dug-up soil, achieving the purpose of loosening the soil while digging, thereby improving the soil breaking rate of rotary tillage.

[0026] This implementation scheme designs the first blade 2 and the second blade 3 as an L-shaped structure. This design aims to overcome the manufacturing bottleneck of traditional forward-tilting "curved blades" to achieve comprehensive performance advantages. The L-shaped structure is essentially a simple geometric shape on a two-dimensional plane. Its straight-line shank and cutting section make blank forging easier, and subsequent machining and quality inspection are also simpler. This structural simplification not only directly reduces the manufacturing cost of a single blade, but also facilitates standardized and modular interface mating with the fixing plate 4 due to its regular shape. Therefore, the L-shaped design fundamentally improves the interchangeability of blades, quick replacement, and the maintenance convenience of the entire cutter shaft.

[0027] Furthermore, the first blade 2 includes two sets, one set of the first blade 2 is disposed on one side of the fixing plate 4, and the other set of the first blade 2 is disposed on the other side of the fixing plate 4, with the bending directions of the two sets of the first blade 2 being opposite; the second blade 3 includes two sets, one set of the second blade 3 is disposed on one side of the fixing plate 4, and the other set of the second blade 3 is disposed on the other side of the fixing plate 4, with the bending directions of the two sets of the second blade 3 being opposite.

[0028] To optimize the cutting process and handle complex soil conditions, the first blade 2 can include two sets. For example, one pair of first blades 2 can be installed on one side of the fixing plate 4, and another pair of first blades 2 can be installed on the other side of the fixing plate 4. One pair of L-shaped first blades 2 bends in a direction perpendicular to the fixing plate 4, while the other pair of L-shaped first blades 2 bends in the opposite direction. Because these two sets of blades bend in opposite directions, they are positioned differently in the soil when cutting into it. This arrangement is intended to cover the soil on both sides of the fixing plate 4.

[0029] Similarly, the second blade 3 also includes two sets, with the two sets of second blades 3 bending in opposite directions. This means that second blades 3 with opposite bending directions are also arranged on both sides of the fixed plate 4. By arranging the combination of forward and reverse curved blades on both sides of the fixed plate 4, the cutter shaft can perform multi-directional composite cutting of the soil during one rotation, greatly improving the overall tillage efficiency.

[0030] Furthermore, the connecting end of the first blade 2 is provided with a first handle 5, which is detachably mounted on the fixing plate 4.

[0031] The first tool holder 5 is part of the first blade 2 and is used to reliably mount the blade to the mounting plate 4. The first tool holder 5 can be integrally forged with the L-shaped cutting part of the first blade 2, or it can be fixedly connected by welding or other methods. The first tool holder 5 is detachably mounted on the mounting plate 4. This detachable connection allows for replacement of the entire mounting plate 4 or tool shaft without replacing a single blade when it wears, is damaged, or needs to be replaced with a different model, significantly reducing maintenance and operating costs. Specifically, the detachable connection can be achieved by: opening mounting holes on the mounting plate 4 that match the shape of the first tool holder 5, inserting the first tool holder 5 into these holes, and then tightening it using side-mounted bolts; or, the end of the first tool holder 5 can be threaded, allowing it to be locked onto the mounting plate 4 with a nut.

[0032] Furthermore, the connecting end of the second blade 3 is provided with a second handle 6, which is detachably mounted on the fixing plate 4.

[0033] The second tool holder 6 has the same structure and function as the first tool holder 5, and is used to detachably mount the second blade 3 to the other side of the fixing plate 4. The second tool holder 6 can also be fixed by means of fastening bolts engaging with the mounting holes of the fixing plate 4. This modular blade design greatly improves the ease of maintenance and flexibility of use of the entire assembly.

[0034] Furthermore, when projected onto a plane perpendicular to the axis of rotation 1, the angle between the centerline of the first tool holder 5 and the centerline of the second tool holder 6 is 0 to 15 degrees.

[0035] When the included angle is 0 degrees, it means that the projections of the first cutter holder 5 and the second cutter holder 6 are parallel to each other. At this time, the installation angles of the blades on both sides are consistent, and the synergistic effect is strongest. When the included angle is between 0 and 15 degrees, there is a slight phase difference or angle difference when the blades on both sides cut into the soil. This design can stagger the peak cutting force of the blades on both sides, making the force on the cutter shaft more stable, effectively reducing torque fluctuations, thereby reducing the impact on the transmission system, and helping to further break up soil clods and mix the soil. The specific value of this included angle can be achieved by machining mounting holes at a specific angle on the fixing plate 4.

[0036] Furthermore, the height of the cutting portion of the first blade 2 is greater than the height of the cutting portion of the second blade 3. The cutting portions of the first blade 2 and the second blade 3 are not located at the same position axially, but rather have a predetermined distance along the axis of the rotating shaft 1. Specifically, they are positioned on the same side of the fixed plate 4, and there is a height difference between the cutting portions of the first blade 2 and the second blade 3. This means that when viewed from the side of the rotating shaft 1, the cutting edges of the first blade 2 and the second blade 3 are not on a straight line, but are staggered, defining different cutting circumferences or located on different axial cutting planes.

[0037] This axially staggered arrangement creates a layered or stepped cutting working principle. When the cutter shaft rotates into the soil, the first blade 2, located at the front, first contacts and cuts the soil, undertaking the initial, heaviest task of breaking up the soil and initially breaking up large clumps. Immediately afterwards, the second blade 3, located at the rear, performs a secondary cut on the initially loosened soil. This method significantly reduces the instantaneous peak torque and impact load during cutter shaft rotation, making the entire transmission system work more smoothly and effectively reducing the tractor's power consumption. Simultaneously, the secondary cutting further refines the still relatively large clumps of soil after the first cut, resulting in a finer, more uniform tillage effect, which is beneficial for subsequent sowing or planting operations. Furthermore, this staggered cutting effectively prevents weeds and straw from tangling and accumulating on the cutter shaft.

[0038] Finally, it should be noted that traditional forward-tilting curved blade structures can only be installed on agricultural machinery with the blades facing forward, and cannot be installed in reverse. If installed backward, tillage operations will be impossible. However, in this specific embodiment, because both the first blade 2 and the second blade 3 are L-shaped, the entire blade can be installed either forward or backward (i.e., the installation positions on both sides are interchanged) without affecting tillage operations. Therefore, the installation of the blade is more convenient and efficient.

[0039] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A rotary tiller shaft for agricultural machinery, comprising a rotating shaft (1) and a plurality of fixing plates (4) spaced apart thereon, characterized in that, At least one pair of L-shaped first blades (2) are provided on one side of the fixing plate (4), and the first blades (2) are arranged symmetrically about the axis of the rotating shaft (1); at least one pair of L-shaped second blades (3) are provided on the other side of the fixing plate (4), and the second blades (3) are arranged symmetrically about the axis of the rotating shaft (1); the cutting part of the first blade (2) is located in the same rotation plane parallel to the axis of the rotating shaft (1), and the cutting part of the second blade (3) is also located in the same rotation plane parallel to the axis of the rotating shaft (1).

2. The rotary tiller shaft according to claim 1, characterized in that, The first blade (2) comprises two sets, one set of the first blade (2) is disposed on one side of the fixing plate (4), and the other set of the first blade (2) is disposed on the other side of the fixing plate (4), with the bending directions of the two sets of the first blade (2) being opposite; the second blade (3) comprises two sets, one set of the second blade (3) is disposed on one side of the fixing plate (4), and the other set of the second blade (3) is disposed on the other side of the fixing plate (4), with the bending directions of the two sets of the second blade (3) being opposite.

3. The rotary tiller shaft according to claim 1, characterized in that, The first blade (2) has a first handle (5) at its connecting end, and the first handle (5) is detachably mounted on the fixing plate (4).

4. The rotary tiller shaft according to claim 3, characterized in that, The second blade (3) is provided with a second handle (6) at the connecting end, and the second handle (6) is detachably mounted on the fixing plate (4).

5. The rotary tiller shaft according to claim 4, characterized in that, Projected onto a plane perpendicular to the axis of the rotating shaft (1), the angle between the center line of the first tool holder (5) and the center line of the second tool holder (6) is 0 to 15 degrees.

6. The rotary tiller shaft for agricultural machinery according to any one of claims 1 to 5, characterized in that, The height of the cutting portion of the first blade (2) is greater than the height of the cutting portion of the second blade (3).

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