A grass entanglement prevention mechanism for a lawnmower

Abstract

The utility model provides a kind of anti grass mechanism for mower, including mower body, the lower end of the mower body is equipped with output shaft, the end of the output shaft is equipped with grass cutting assembly, the grass cutting assembly includes the cutter holder fixed in the end of the output shaft, the cutter holder is equipped with grass cutting blade for cutting grass, the grass cutting blade is at least two and is uniformly distributed in circumference;The upper end surface of the cutter holder and the lower bottom surface of the mower body have spacing and form mounting space, the cutting grass blade is equipped in the mounting space, the cutting edge of the cutting grass blade is outwardly arranged and is used for cutting off the winding forage.The utility model provides a kind of anti grass mechanism for mower, compact structure, easy to assemble and disassemble, cutting efficiency is high and effect is good, can effectively solve the winding problem of forage.

Description

Technical Field

[0001] This utility model relates to an electric motor, and more particularly to an anti-grass tangling mechanism for a lawnmower. Background Technology

[0002] A lawnmower is a mechanical device used to trim and maintain lawns or grassland landscapes. Its core function is to quickly cut weeds and long grass to a uniform height using rotating blades or a cutting system, keeping the lawn neat and beautiful.

[0003] During mowing, grass stems, weeds, or damp grass clippings may become entangled in the blades, rollers, or chassis for the following reasons:

[0004] 1. Grass quality and environment: Damp or tough grass (such as vines) tends to stick together; long grasses that are not trimmed in time form tangled clumps.

[0005] 2. Equipment design: Insufficient blade speed, dull blade edge, or excessive clearance between the chassis can lead to incomplete cutting, with residual grass stems being caught in the mechanical structure.

[0006] 3. Operational factors: Cutting grass that is too tall or too dense in one go, or failing to clean up accumulated grass clippings.

[0007] When grass becomes tangled, the following problems arise:

[0008] 1. Performance degradation: Entangled material hinders blade rotation, reduces cutting efficiency, and may even cause motor overload or engine stall.

[0009] 2. Safety hazards: The machine must be stopped when clearing tangled materials. Failure to disconnect the power supply may cause personal injury.

[0010] 3. Equipment wear and tear: Long-term winding will increase blade wear, bearing load, and shorten machine life.

[0011] Therefore, there is an urgent need to develop a lawnmower that can effectively solve the problem of tangling. Utility Model Content

[0012] Technical problems to be solved

[0013] The technical problem to be solved by this utility model is to provide a grass-tangle-prevention mechanism for lawnmowers that is compact in structure, easy to install, and can effectively prevent tangling.

[0014] Technical solutions to the problem

[0015] This utility model provides an anti-tangle grass mechanism for a lawnmower, which includes a lawnmower body 1. The lower end of the lawnmower body 1 is provided with an output shaft 11. The end of the output shaft 11 is provided with a grass-cutting assembly. The grass-cutting assembly includes a blade holder 3 fixed to the end of the output shaft 11. Grass-cutting blades 61 for cutting grass are installed on the blade holder 3. There are at least two grass-cutting blades 61 and they are evenly distributed around the perimeter. There is a gap between the upper end surface of the blade holder 3 and the lower bottom surface of the lawnmower body 1 to form an installation space. Grass-cutting blades are provided in the installation space. The blades of the grass-cutting blades are arranged with their cutting edges facing outward and are used to cut tangled grass.

[0016] Furthermore, the grass-cutting blade is disposed at the upper end of the installation space and / or the lower end of the installation space.

[0017] Furthermore, the grass-cutting blade includes a first blade 42 disposed at the upper end of the mounting space and a second blade 52 disposed at the lower end of the mounting space, and the sum of the projected heights of the first blade 42 and the second blade 52 is greater than the height of the mounting space.

[0018] Furthermore, the first blade 42 and the second blade 52 are arranged alternately.

[0019] Furthermore, the length direction of the cutting edge of the first blade 42 and / or the second blade 52 is inclined to the axial direction of the output shaft 11.

[0020] Furthermore, the cutting edges of the first blade 42 and the second blade 52 are tilted in opposite directions.

[0021] Furthermore, the number of grass-cutting blades is 1-8.

[0022] Furthermore, an annular support ring is fixed to the upper and / or lower end of the installation space, and the grass-cutting blade is fixed to the support ring.

[0023] Furthermore, the cutting edge of the grass-cutting blade is located in the radial direction of the output shaft 11 or inclined towards the forward direction of the output shaft 11.

[0024] Furthermore, the sidewall of the tool holder 3 is inclined and forms a conical structure with a smaller upper end and a larger lower end.

[0025] Furthermore, a pulley 2 is fixed on the output shaft 11. The pulley 2 is located above the tool holder 3, and the installation space is formed between the lower end of the pulley 2 and the upper end of the tool holder 3.

[0026] Beneficial effects

[0027] This utility model relates to an anti-tangle grass mechanism for lawnmowers. A grass-cutting blade is installed in the gap at the upper end of the blade holder to cut tangled grass, effectively preventing grass from tangling around the blade shaft. This ensures the normal operation of the lawnmower, improves work efficiency, extends service life, and guarantees operational safety. The upper and lower blade structure creates a complementary height, eliminating blind spots and enhancing the cutting effect. It also eliminates dead angles and provides excellent anti-tangle performance. The inclined blade design allows for axial sliding on the blade during grass tangling, creating a cutting effect and enhancing the cutting efficiency. A support ring structure facilitates the installation, removal, and replacement of the grass-cutting blade, resulting in low usage and maintenance costs. It can adapt to installation spaces of different heights, making it widely applicable. This anti-tangle grass mechanism for lawnmowers is compact, easy to install and remove, has high cutting efficiency and good effect, and effectively solves the problem of grass tangling. Attached Figure Description

[0028] Figure 1 This is a schematic diagram showing the usage state of the anti-tangle grass mechanism of this utility model for a lawnmower;

[0029] Figure 2 This is a schematic diagram of the anti-grass tangling mechanism for a lawnmower according to the present invention;

[0030] Figure 3 This is a front view of the anti-grass tangling mechanism for a lawnmower according to this utility model;

[0031] Figure 4 This is a cross-sectional view of the anti-grass tangling mechanism for a lawnmower according to the present invention;

[0032] Figure 5 This is a schematic diagram of the grass-cutting blade of the anti-tangle grass mechanism for a lawnmower according to the present invention;

[0033] Figure 6 This is a schematic diagram showing the installation of the second blade of the anti-tangle mechanism for a lawnmower according to this utility model;

[0034] Figure 7 This is a schematic diagram showing the installation of the first blade of the anti-tangle mechanism for a lawnmower according to this utility model;

[0035] Figure 8 This is a schematic diagram of another embodiment of the grass-cutting blade of the anti-tangle mechanism for a lawnmower according to the present invention. Detailed Implementation

[0036] The embodiments of this utility model will now be described in detail with reference to the accompanying drawings.

[0037] See Figures 1-8This utility model provides an anti-grass tangling mechanism for a lawnmower, including a lawnmower body 1. The lawnmower body 1 has a walking mechanism that can move on the grass to carry out mowing operations. A power mechanism is provided inside the lawnmower body 1 to provide power for the rotation of the blades.

[0038] An output shaft 11 is provided at the lower end of the lawnmower body 1. The output shaft 11 is connected to the power mechanism. The power mechanism can drive the output shaft 11 to rotate, thereby driving the blades to rotate and mowing the lawn. The power mechanism can be electric or internal combustion type. The internal combustion engine can be a gasoline engine or a diesel engine. It has the characteristics of high power and long running time, and is suitable for large lawns or commercial use.

[0039] A mowing assembly is provided at the end of the output shaft 11. The mowing assembly includes a blade holder 3. In this application, the blade holder 3 is circular and is fixed at the end of the output shaft 11 as a mounting carrier for the blade. In order to facilitate installation and daily maintenance, the blade holder 3 is detachably installed at the end of the output shaft 11. Preferably, it is installed and fixed by a key and bolts.

[0040] A grass-cutting blade 61 is installed on the blade holder 3. Specifically, a blade holder 6 is fixed at the lower end of the blade holder 3. The blade holder 6 is a plate-shaped structure. A grass-cutting blade 61 is installed on the blade holder. The edge of the grass-cutting blade 61 is provided with a cutting edge. There are at least two grass-cutting blades 61, which are evenly distributed around the circumference. By rotating the output shaft 11, the grass-cutting blades rotate at high speed, thereby achieving grass cutting.

[0041] There is a gap between the upper end face of the blade holder 3 and the lower bottom face of the lawnmower body 1. This gap forms an installation space. A grass-cutting blade is installed in this installation space with the blade facing outward. It is used to cut the tangled grass. When the grass becomes tangled in the gap, it will generate a radially inward tightening force and come into contact with the blade of the grass-cutting blade to cut it, thereby cutting the tangled grass and preventing it from getting tangled on the rotating shaft and affecting the rotation of the output shaft 11.

[0042] The aforementioned grass-cutting blade can be set at the upper end of the installation space (spacing), or at the lower end of the installation space (spacing), or at both the upper and lower ends of the installation space (spacing). Preferably, it is set at both the upper and lower ends of the installation space (spacing), which can eliminate all gaps at the upper end of the blade holder, thereby cutting the grass wrapped in the space and avoiding the formation of dead angles due to gaps, which would affect the cutting.

[0043] Specifically, the grass-cutting blade includes a first blade 42 and a second blade 52. The first blade 42 is located at the upper end of the installation space, and the second blade 52 is located at the lower end of the installation space. The sum of the projected heights (effective heights) of the first blade 42 and the second blade 52 is greater than the height of the installation space. That is, the sum of the projected lengths of the first blade 42 and the second blade 52 on the output shaft (vertical direction) is greater than the height of the installation space. The first blade 42 and the second blade 52 are staggered in both the horizontal (radial) and vertical directions, so that the blade of the grass-cutting blade can cover the entire installation space, eliminating dead corners of entanglement and improving the anti-entanglement effect.

[0044] To improve the cutting effect, the length direction of the cutting edge of the first blade 42 and / or the second blade 52 is inclined to the axial direction of the output shaft 11. Specifically, the plane where the first blade 42 and the second blade 52 are located is perpendicular to the upper surface of the blade holder 3, while the outer cutting edges of the first blade 42 and the second blade 52 are inclined to the upper surface of the blade holder 3. That is, the distance between the upper and lower ends of the cutting edge and the axis of the output shaft 11 is different. With the above structural arrangement, when rotating at high speed, the first blade or the second blade forms a conical structure. When the grass is wrapped, it moves in the direction with a smaller radius, generating axial movement, that is, relative movement with the cutting edge, forming a cutting effect, thereby improving the cutting efficiency and effect.

[0045] In this application, the cutting edges of the first blade 42 and the second blade 52 are inclined in opposite directions. Specifically, the lower end of the first blade 42 is inclined inward, and the upper end of the second blade 52 is inclined inward. During high-speed rotation, a structure with larger ends and a smaller middle is formed, creating a V-shaped structure between the first and second blades. (See reference...) Figure 5 This causes the straw to slide towards the center during the winding process, generating cutting force and improving cutting efficiency and effectiveness.

[0046] In order to reduce the contact area between the hay and the cutting blades and improve the cutting effect, the number of cutting blades in this application is 1-8, preferably 2-6, which can increase the cutting force on the hay when it is wrapped, thereby improving the anti-winding effect.

[0047] Regarding the arrangement of the grass-cutting blade, the cutting edge of the blade is located in the radial direction of the output shaft 11, or inclined towards the forward direction of the output shaft 11. The aforementioned cutting edge direction refers to the direction of the plane containing the grass-cutting blade. The cutting edge being located in the radial direction of the main shaft 11 means that the plane containing the grass-cutting blade is located in the radial direction of the output shaft 11. (See reference...) Figure 4 , Figures 6-7 At this point, the cutting edge of the grass-cutting blade is positioned outwards, i.e., in the radial direction of the output shaft; when facing the forward direction of the output shaft, the surface of the grass-cutting blade is inclined in the radial direction of the output shaft. (See reference...) Figure 8At this time, the blade of the grass-cutting blade is set outwards and towards the (rotational) forward direction of the output shaft, which can generate a certain cutting angle and enhance the cutting efficiency.

[0048] In this application, the plane on which the grass-cutting blade is located can be perpendicular to the top surface (horizontal plane) of the blade holder 3 or inclined to the top surface of the blade holder 3, which can be selected according to different usage environments.

[0049] In this application, a support ring is fixed at the upper and / or lower end of the installation space. The support ring is circular and can be fixed to the upper and lower ends of the installation space by welding. The grass cutting blade is welded and fixed to the support ring. For ease of assembly, replacement and maintenance, preferably, the grass cutting blade is fixed to the upper and lower ends of the installation space by bolts.

[0050] In order to prevent grass from getting tangled on the outer wall of the blade holder 3, the side wall of the blade holder 3 is inclined, forming a conical structure with a smaller top and a larger bottom. Therefore, when grass gets tangled on its outer wall, the grass will slide upward along the inclined surface and enter the grass cutting blade area, improving the cutting effect.

[0051] In this application, a pulley 2 is also fixed on the output shaft 11. The pulley 2 is located outside the lawnmower body 1 and above the blade holder 3. It is used to connect to a motor as a drive end. In this application, it serves as a starting auxiliary end for the internal combustion engine (diesel engine or gasoline engine). An installation space is formed between the lower end of the pulley 2 and the upper end of the blade holder 3. The grass cutting blade is disposed between the lower end face of the pulley 2 and the upper end face of the blade holder 3.

[0052] The following are examples:

[0053] The pulley 2 is keyed onto the output shaft 11 and secured with bolts. A first support ring 41 is fixed to the lower end face of the pulley 2, which can be fixed by welding or bolts. The first support ring 41 is annular and coaxial with the pulley 2. A first blade 42 is fixed to the lower end face of the first support ring 41 by welding. The blade 42 has its cutting edge facing outwards. The first blade 42 is perpendicular to the first support ring 41, and the plane containing the first blade 42 is located in the radial direction of the first support ring, or inclined to the radial direction of the first support ring 41. When the first blade 42 is inclined to the radial direction of the first support ring 41, the blade 42 is perpendicular to the first support ring 41. When the first support ring 41 is in the radial direction, its blade is set towards the forward direction of the output shaft; the first blade 42 is trapezoidal or triangular, and one end of its blade is inclined, that is, the length direction of the blade of the first blade 42 is inclined to the first support ring 41. In this embodiment, the lower end of the blade of the first blade 42 is inclined inward, and when rotated, it forms a conical structure with a larger upper end and a smaller lower end; the blade holder 3 includes a sleeve 31, the lower end of which extends radially outward to form a blade holder body 32, which is used to install the grass-cutting blade; a second support ring 51 is fixed on the upper end face of the blade holder body 32, which can be fixed by welding or bolts. Ring 51 is circular and coaxial with sleeve 31. A second blade 52 is fixed to the upper end face of the second support ring 51 by welding. The blade 52 has its cutting edge facing outward. The second blade 52 is perpendicular to the second support ring 51, and the plane of the second blade 52 is located in the radial direction of the second support ring, or inclined to the radial direction of the second support ring 51. When the second blade 52 is inclined to the radial direction of the second support ring 51, its cutting edge faces the forward direction of the output shaft. The second blade 52 is trapezoidal or triangular, and one end of its cutting edge is inclined, i.e., the blade of the second blade 52... The blade's length direction is inclined to the second support ring 51. In this embodiment, the upper end of the blade of the second blade 52 is inclined inward, forming a conical structure with a larger lower end and a smaller upper end when rotated. The first blade 42 and the second blade 52 are staggered, and the effective height (projected length in the vertical direction) of the first blade and the second blade is more than half of the distance between the first support ring and the second support ring, preferably 0.6-0.8, and the inclination angle of the blade's length direction is the same for both. When adjusting the distance between the blade holder and the pulley, it will not affect the cutting effect on the wrapped grass. In order to improve dynamic balance, the grass-cutting blades are arranged in an axially uniform manner.

[0054] This utility model relates to an anti-tangle grass mechanism for lawnmowers. A grass-cutting blade is installed in the gap at the upper end of the blade holder to cut tangled grass, effectively preventing grass from tangling around the blade shaft. This ensures the normal operation of the lawnmower, improves work efficiency, extends service life, and guarantees operational safety. The upper and lower blade structure creates a complementary height, eliminating blind spots and enhancing the cutting effect. It also eliminates dead angles and provides excellent anti-tangle performance. The inclined blade design allows for axial sliding on the blade during grass tangling, creating a cutting effect and enhancing the cutting efficiency. A support ring structure facilitates the installation, removal, and replacement of the grass-cutting blade, resulting in low usage and maintenance costs. It can adapt to installation spaces of different heights, making it widely applicable. This anti-tangle grass mechanism for lawnmowers is compact, easy to install and remove, has high cutting efficiency and good effect, and effectively solves the problem of grass tangling.

[0055] The above description is only a preferred embodiment of the present utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of the present utility model, and these improvements and modifications should also be considered within the protection scope of the present utility model.

Claims

1. An anti-grass tangling mechanism for a lawnmower, characterized in that: The device includes a lawnmower body, an output shaft at the lower end of the lawnmower body, a mowing assembly at the end of the output shaft, a blade holder fixed to the end of the output shaft, and at least two mowing blades evenly distributed circumferentially on the blade holder. A gap exists between the upper surface of the blade holder and the lower surface of the lawnmower body, forming an installation space. A cutting blade is disposed within the installation space, with its cutting edge facing outwards and used to cut tangled grass.

2. The anti-tangle mechanism for a lawnmower as described in claim 1, characterized in that: The grass-cutting blade is disposed at the upper end of the installation space and / or the lower end of the installation space.

3. The anti-tangle mechanism for a lawnmower as described in claim 1, characterized in that: The grass-cutting blade includes a first blade disposed at the upper end of the installation space and a second blade disposed at the lower end of the installation space, wherein the sum of the effective heights of the first blade and the second blade is greater than the height of the installation space.

4. The anti-tangle mechanism for a lawnmower as described in claim 3, characterized in that: The first blade and the second blade are arranged alternately.

5. The anti-tangle mechanism for a lawnmower as described in claim 3, characterized in that: The cutting edge of the first blade and / or the second blade is inclined along the axial direction of the output shaft.

6. The anti-tangle mechanism for a lawnmower as described in claim 5, characterized in that: The cutting edges of the first blade and the second blade are tilted in opposite directions.

7. The anti-tangle mechanism for a lawnmower as described in claim 1, characterized in that: An annular support ring is fixed to the upper and / or lower end of the installation space, and the grass-cutting blade is fixed to the support ring.

8. The anti-tangle mechanism for a lawnmower as described in claim 1, characterized in that: The cutting edge of the grass-cutting blade is located in the radial direction of the output shaft or inclined in the forward direction of the output shaft.

9. The anti-tangle mechanism for a lawnmower as described in claim 1, characterized in that: The sidewall of the tool holder is inclined and forms a conical structure that is smaller at the top and larger at the bottom.

10. The anti-tangle mechanism for a lawnmower as described in any one of claims 1-9, characterized in that: A pulley is also fixed on the output shaft. The pulley is located above the tool holder, and the installation space is formed between the lower end of the pulley and the upper end of the tool holder.

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