A dustproof and grass entanglement prevention structure of a micro tiller cutter

Abstract

The utility model discloses a kind of micro tiller cutter dustproof and anti-winding grass structure, belong to micro tiller field, the inner end of protective sleeve is provided with inwardly extending sealing flange, the sealing flange and the end cover outer periphery of micro tiller tooth box lower box form labyrinth seal structure, the outside of protective sleeve is provided with active cutting assembly, the outer wall of sealing flange is provided with elastic scraping assembly, the outside of protective sleeve is provided with turbulence anti-winding component.The micro tiller cutter dustproof and anti-winding grass structure, by setting sealing flange in protective sleeve inner end, with the end cover outer periphery of micro tiller tooth box form labyrinth seal structure, the structure under the premise of not generating friction loss, greatly increase the path length and resistance of dust invading inside output shaft, effectively block the fine sand and soil raised when ploughing, to significantly reduce the abnormal wear risk of output shaft and oil seal, prevent lubricating oil leakage, prolong the service life of equipment core component.

Description

Technical Field

[0001] This utility model relates to the field of micro-tiller technology, specifically a structure for preventing dust and grass entanglement in micro-tiller blades. Background Technology

[0002] Mini tillers are small farming machines widely used in modern agriculture. Their blades (dryland blades or paddy field wheels) are typically connected to the tiller's output shaft via a structure such as an internal hexagonal shaft. In existing technology, this connection point generally lacks effective protective devices, resulting in two major drawbacks:

[0003] 1. Poor dustproof capability: There is a large gap between the blades and the end cover of the lower gearbox of the micro-tiller. Sand and soil raised during operation can easily enter the output shaft through this gap, causing abnormal wear of the output shaft and its oil seal, resulting in lubricating oil leakage and affecting the life of the equipment.

[0004] 2. Easy to get tangled in weeds: During operation, weeds can easily get caught in the exposed gap between the output shaft and the cutter. The tangled weeds will accumulate with the workload, increasing the operating load of the equipment. In severe cases, it can cause the engine to overload and shut down, affecting the tillage efficiency, and cleaning and maintenance are very inconvenient.

[0005] Therefore, this utility model provides a structure for preventing dust and grass entanglement on the blades of a micro-tiller to solve the above problems. Utility Model Content

[0006] This utility model provides a dustproof and grass-proof structure for the blades of a mini tiller. It aims to solve the problem in the prior art where there is a large gap between the blades and the end cover of the lower housing of the mini tiller's gearbox. During operation, sand and soil kicked up can easily enter the output shaft through this gap, leading to abnormal wear of the output shaft and its oil seal, causing lubricating oil leakage, and affecting the equipment's lifespan.

[0007] To achieve the above objectives, this utility model provides the following technical solution: a dustproof and grass-proof structure for a micro-tiller blade, comprising a protective sleeve coaxially fixedly sleeved on the output shaft of the micro-tiller, wherein the inner end of the protective sleeve is provided with an inwardly extending sealing flange, the sealing flange and the outer periphery of the end cover of the lower housing of the micro-tiller blade box form a labyrinth-type sealing structure, an active cutting component is provided on the outside of the protective sleeve, an elastic scraping component is provided on the outer wall of the sealing flange, and a turbulence-preventing component is provided on the outside of the protective sleeve.

[0008] As a preferred technical solution of this application, the outer wall of the protective sleeve is fixedly connected with a plurality of first support shafts, one end of the plurality of first support shafts is fixedly connected to the inner wall of the same connecting ring, a plurality of cutting tools are fixedly connected circumferentially at a distance from the outer wall of the plurality of connecting rings, and a second support shaft is fixedly connected to the outer wall of the connecting ring, one end of the second support shaft is fixedly connected to the cutting tool.

[0009] As a preferred technical solution of this application, the active cutting assembly includes a connecting flange, the inner wall of the connecting flange is fixedly connected to the outer surface of the protective sleeve, a follower cutter disc is fixedly connected to the outer wall of the connecting flange, and a plurality of cutting teeth are fixedly connected equidistantly around the outer wall of the follower cutter disc, the cutting edge of the cutting teeth facing the opposite direction to the rotation direction of the cutter.

[0010] As a preferred technical solution of this application, the elastic scraping component includes an annular groove, which is formed outside the sealing flange. The sealing flange is connected to the annular elastic ring through the annular groove, and the outer wall of the annular elastic ring is provided with a plurality of elastic scraping lips.

[0011] As a preferred technical solution of this application, the turbulence-preventing component includes a spiral guide groove, which is formed on the outer wall of the protective sleeve.

[0012] As a preferred technical solution of this application, the outer surface of the protective sleeve is covered with a non-stick coating.

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

[0014] 1. The dustproof and grass-tangle-proof structure of this mini-tiller blades utilizes a sealing flange at the inner end of the protective sleeve, forming a labyrinthine seal with the outer periphery of the end cover of the mini-tiller's gearbox. This structure significantly increases the path length and resistance for dust to enter the output shaft without generating frictional wear, effectively blocking fine sand and soil stirred up during tilling. This significantly reduces the risk of abnormal wear on the output shaft and oil seals, prevents lubricating oil leakage, and extends the service life of the equipment's core components.

[0015] 2. The dust and grass-proof structure of this mini-tiller's blades utilizes a multi-layered, synergistic protection system comprised of an active cutting component, an elastic scraping component, and a flow-deflecting anti-tangling component. The active cutting component pre-cuts nearby weeds; the elastic scraping component dynamically removes soil and short fibers adhering to the sealing surface; and the flow-deflecting anti-tangling component alters the flow direction of grass clippings and soil, preventing their accumulation and entanglement. This composite design fundamentally solves the problem of weeds entangled and accumulating in the shaft end gap, reduces equipment operating resistance, prevents engine overload and stalling due to grass entanglement, and significantly reduces the frequency and difficulty of manual cleaning and maintenance. Attached Figure Description

[0016] Figure 1 A schematic diagram of a dustproof and grass-proof structure for the blades of a micro-tiller;

[0017] Figure 2 A schematic diagram of the overall structure of the elastic scraping component in the dustproof and grass-proof structure of a micro-tiller blade;

[0018] Figure 3 This is a schematic diagram of the overall structure of the active cutting component in the dustproof and grass-proof structure of a micro-tiller blade;

[0019] Figure 4 This is a three-dimensional structural diagram of the blade in a dustproof and grass-proof structure for a micro-tiller blade.

[0020] In the picture:

[0021] 1. Protective sleeve; 2. Sealing flange; 3. End cap; 4. Active cutting assembly; 401. Connecting flange; 402. Follower cutter head; 403. Cutting teeth; 5. Elastic scraping assembly; 501. Annular groove; 502. Annular elastic ring; 503. Elastic scraping lip; 6. Deflector and anti-entanglement assembly; 7. First support shaft; 8. Connecting ring; 9. Cutting tool; 10. Second support shaft. Detailed Implementation

[0022] 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.

[0023] Please see Figures 1-4 A dustproof and grass-proof structure for a mini-tiller blade includes a protective sleeve 1 coaxially fixed to the output shaft of the mini-tiller. The inner end of the protective sleeve 1 has an inwardly extending sealing flange 2. The sealing flange 2 and the outer periphery of the end cover 3 of the lower housing of the mini-tiller's gearbox form a labyrinthine seal structure with a radial gap of 1mm to 40mm. The sealing flange 2 at the inner end of the protective sleeve 1 extends to the outer periphery of the end cover 3 of the lower housing of the mini-tiller's gearbox, forming a narrow radial labyrinth gap between them. When the mini-tiller is operating, this labyrinth structure provides multiple barriers and airflow disturbances to dust attempting to enter, causing most of the dust to be thrown out of the gap under centrifugal force. Even the small amount of dust that does enter the gap is difficult to reach the internal output shaft oil seal due to its tortuous path, thus achieving a highly efficient non-contact dynamic seal. An active cutting component 4 is provided on the outside of the protective sleeve 1, an elastic scraping component 5 is provided on the outer wall of the sealing flange 2, and a turbulence-preventing component 6 is provided on the outside of the protective sleeve 1.

[0024] Please see Figure 4The outer wall of the protective sleeve 1 is fixedly connected to multiple first support shafts 7. One end of each first support shaft 7 is fixedly connected to the inner wall of the same connecting ring 8. Multiple cutting tools 9 are fixedly connected equidistantly around the outer wall of the connecting ring 8. A second support shaft 10 is fixedly connected to the outer wall of the connecting ring 8. One end of the second support shaft 10 is fixedly connected to the cutting tool 9. The protective sleeve 1 is connected to the connecting ring 8 and the cutting tool 9 through the first support shafts 7 and the second support shaft 10, which strengthens the support rigidity of the cutting tool 9 and is beneficial to stable tillage. At the same time, the protective structure and the support structure are combined into one, saving materials and installation space, and reducing the overall cost and complexity.

[0025] Please see Figure 3 The active cutting assembly 4 includes a connecting flange 401, the inner wall of which is fixedly connected to the outer surface of the protective sleeve 1. A follower cutter disc 402 is fixedly connected to the outer wall of the connecting flange 401. Multiple cutting teeth 403 are equidistantly fixedly connected to the outer circumference of the follower cutter disc 402. The cutting edges of the cutting teeth 403 face opposite directions to the rotation direction of the cutter 9. The active cutting assembly 4 rotates synchronously with the protective sleeve 1 via the connecting flange 401. During cultivation, weeds and vines near the gap between the output shaft and the end cap 3 are actively cut or broken by the high-speed rotating cutting teeth 403, preventing them from approaching and entangled in the critical gap, thus eliminating the conditions for weed entanglement at the source.

[0026] Please see Figure 2 The elastic scraping assembly 5 includes an annular groove 501, which is formed on the outside of the sealing flange 2. The sealing flange 2 is connected to the annular elastic ring 502 through the annular groove 501. The outer wall of the annular elastic ring 502 is provided with multiple elastic scraping lips 503. The multiple elastic scraping lips 503 on the annular elastic ring 502 of the elastic scraping assembly 5, which is mounted on the sealing flange 2, maintain flexible contact with the outer surface of the end cap 3. When the protective sleeve 1 rotates, the elastic scraping lips 503 continuously scrape away wet mud or short, chopped grass clippings that may adhere to the surface of the end cap 3, preventing them from hardening and accumulating, ensuring the cleanliness of the labyrinth sealing area, and maintaining a long-lasting dustproof effect.

[0027] Please see Figure 4 The turbulence-preventing component 6 includes a spiral guide groove, which is formed on the outer wall of the protective sleeve 1. When the spiral guide groove is rotated, it generates turbulence along the axial direction. This turbulence can effectively guide the soil and grass clippings turned up by the cutter 9 to move towards the working area of ​​the cutter 9 in a spiral direction and throw them away, preventing them from stagnating and accumulating on the surface of the protective sleeve 1.

[0028] The outer surface of the protective sleeve 1 is covered with a non-stick coating. The non-stick coating on the outer surface of the protective sleeve 1 further reduces the adhesion of soil and grass clippings, making it easier for weeds to be shaken off, thus forming a dual anti-adhesion effect that combines physical structure and surface treatment.

[0029] The above are merely preferred embodiments of this utility model, but the scope of protection of this utility model is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in this utility model, based on the technical solution and inventive concept of this utility model, should be included within the scope of protection of this utility model.

Claims

1. A dustproof and grass-proof structure for a micro-tiller blade, comprising a protective sleeve (1) coaxially fixedly sleeved on the output shaft of the micro-tiller, characterized in that: The inner end of the protective sleeve (1) is provided with an inwardly extending sealing flange (2). The sealing flange (2) and the outer periphery of the end cover (3) of the lower box of the micro-tiller tooth box form a labyrinth-type sealing structure. The outer side of the protective sleeve (1) is provided with an active cutting component (4). The outer wall of the sealing flange (2) is provided with an elastic scraping component (5). The outer side of the protective sleeve (1) is provided with a turbulence-preventing component (6).

2. The dustproof and grass-proof structure for a micro-tiller blade according to claim 1, characterized in that: The outer wall of the protective sleeve (1) is fixedly connected to a plurality of first support shafts (7), one end of the plurality of first support shafts (7) is fixedly connected to the inner wall of the same connecting ring (8), a plurality of cutting tools (9) are fixedly connected to the outer wall of the plurality of connecting rings (8) at equal intervals, and a second support shaft (10) is fixedly connected to the outer wall of the connecting ring (8), one end of the second support shaft (10) is fixedly connected to the cutting tool (9).

3. The dustproof and grass-proof structure for a micro-tiller blade according to claim 1, characterized in that: The active cutting assembly (4) includes a connecting flange (401), the inner wall of which is fixedly connected to the outer surface of the protective sleeve (1), and a follower cutter disc (402) is fixedly connected to the outer wall of the connecting flange (401). A plurality of cutting teeth (403) are fixedly connected to the outer circumference of the follower cutter disc (402), and the cutting edge of the cutting teeth (403) is opposite to the rotation direction of the cutter (9).

4. The dustproof and grass-proof structure for a micro-tiller blade according to claim 1, characterized in that: The elastic scraping assembly (5) includes an annular groove (501) which is opened on the outside of the sealing flange (2). The sealing flange (2) is connected to the annular elastic ring (502) through the annular groove (501). The outer wall of the annular elastic ring (502) is provided with a plurality of elastic scraping lips (503).

5. The dustproof and grass-proof structure for a micro-tiller blade according to claim 1, characterized in that: The turbulence-preventing component (6) includes a spiral guide groove, which is formed on the outer wall of the protective sleeve (1).

6. The dustproof and grass-proof structure for a micro-tiller blade according to claim 1, characterized in that: The outer surface of the protective sleeve (1) is covered with a non-stick coating.

Images