A lawnmower

Abstract

The application relates to the field of lawn mowers, in particular to a lawn mower which comprises a machine body, an elastic element, a grass combing element and a braking mechanism, the machine body comprises a machine body, a cutting mechanism and a moving mechanism; the moving mechanism is arranged on the machine body and is used for driving the lawn mower to move, the moving mechanism comprises a wheel; the grass combing element is rotationally connected to the machine body around a first axis and is located on the front side of the moving mechanism and the cutting mechanism, the first axis extends along the left-right direction of the machine body; the elastic element provides a pre-tightening force for the grass combing element to keep an initial interval with the wheel; after the grass combing element is collided by an external force greater than the pre-tightening force, the grass combing element rotates against the force of the elastic element to trigger the braking mechanism to brake the moving mechanism and / or the cutting mechanism. The lawn mower can detect stones in grass clumps.

Description

Technical Field

[0001] This application relates to the field of lawn mowing devices, and more particularly to a lawn mower. Background Technology

[0002] Currently, existing lawnmowers typically have anti-collision mechanisms such as guard bars or bumpers on the front to prevent damage from collisions with obstacles. Some robots also incorporate vision or radar sensors to enhance their environmental awareness. However, in practical applications, these sensors are limited by factors such as grass obstruction, lighting conditions, and the material of objects, making them unreliable in detecting hard objects that are completely or partially hidden in the grass. Therefore, lawnmowers are still prone to collisions with such hard objects during operation, which can severely impact the cutting mechanism, leading to blade breakage, damage to the transmission structure, and even blades being thrown out, posing a potential threat to the user's safety.

[0003] In response to the above problems, the industry urgently needs a lawnmower that can effectively deal with hard obstacles in the grass to avoid damage to critical components, so as to improve the reliability and safety of the equipment. Summary of the Invention

[0004] This application provides a lawnmower that can effectively deal with hard obstacles in grass and avoid damage to key components.

[0005] This application provides a lawnmower, including a body, an elastic element, a combing element, and a braking mechanism. The body includes a frame, a cutting mechanism, and a moving mechanism. The moving mechanism is disposed on the body and is used to drive the lawnmower to move; the moving mechanism includes wheels. The comb is rotatably connected to the machine body around a first axis and is located in front of the moving mechanism and the cutting mechanism. The first axis extends along the left and right direction of the machine body. The elastic element provides a preload force to the combing component to maintain an initial distance from the wheel; after being impacted by an external force greater than the preload force, the combing component rotates against the force of the elastic element to trigger the braking mechanism to brake the moving mechanism and / or the cutting mechanism.

[0006] Optionally, the braking mechanism includes a sensing component and a controller; the sensing component is signal-connected to the controller, and the controller is used to control the moving mechanism to stop moving and / or the cutting mechanism to stop working, such that after the rotation of the comb triggers the sensing component to generate an electrical signal, the controller receives the electrical signal and controls the moving mechanism to stop moving and / or the cutting mechanism to stop working.

[0007] Optionally, the sensing components include a magnet disposed on the comb and a Hall sensor disposed on the body.

[0008] Optionally, the elastic element is a torsion spring.

[0009] Optionally, the comb can be detachably connected to the body.

[0010] Optionally, when the combing component maintains an initial distance from the wheel, the lowest point of the combing component is level with or lower than the lowest point of the cutting height of the cutting mechanism.

[0011] Optionally, the grass combing component includes a base and multiple comb teeth. The base is rotatably connected to the hinge shaft of the machine body. The multiple comb teeth are spaced apart on the base along the left-right direction of the machine body. The interval between two adjacent comb teeth is used to allow grass in front of the lawnmower to pass through during the movement of the lawnmower.

[0012] Optionally, the comb teeth are provided with a transition slope, wherein the front end of the transition slope is higher than the rear end.

[0013] Optionally, the body further includes an anti-collision mechanism, which is disposed in front of the moving mechanism in the direction of movement; The comb component includes a rotating shaft, a base, and multiple comb teeth. The base and the rotating shaft are connected, and the rotating shaft is rotatably connected to the anti-collision mechanism. The multiple comb teeth are evenly spaced on the side of the base away from the anti-collision mechanism, and the comb teeth extend towards the ground.

[0014] Optionally, the comb teeth are provided with friction surfaces, and when the comb teeth abut against the tire tread of the wheel due to rotation, the friction surfaces contact the tire tread.

[0015] This invention relates to a system where, when the lawnmower is moving normally on the grass, the comb component is maintained at a certain distance from the wheel under the preload of the torsion spring. This initial distance is referred to as the initial position, allowing grass blades to slide through the gaps in the comb teeth. When obstacles such as stones appear in front of the lawnmower, the stones will first impact the comb teeth. If the impact force is greater than the preload of the torsion spring, the comb component will overcome the force of the torsion spring and rotate backward and upward. As the comb component rotates, it triggers the braking mechanism to brake the moving mechanism and / or the cutting mechanism, effectively preventing stones from entering from below the mower and colliding with the cutting mechanism, thus breaking the blades. Attached Figure Description

[0016] Figure 1 This is an initial position diagram of the combing component of a lawnmower provided in an embodiment of this application; Figure 2This is a schematic diagram of a lawnmower colliding with a stone, according to an embodiment of this application. Figure 3 This is a connection diagram of the grass combing component and the anti-collision mechanism of a lawnmower provided in one embodiment of this application; Figure 4 This is a schematic diagram of the lawnmower comb component rotating relative to the anti-collision mechanism according to an embodiment of this application.

[0017] Explanation of reference numerals in the attached figures: 1. Body; 2. Anti-collision mechanism; 21. Bearing component; 22. Anti-collision component; 4. Comb component; 41. Base; 42. Comb teeth; 43. Transition slope; 44. Rotating shaft; 51. Magnet. Detailed Implementation

[0018] To make the technical problems, technical solutions, and beneficial effects solved by this application clearer, the following detailed description is provided in conjunction with embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the scope of this application.

[0019] Reference Figure 1 and Figure 4 This application provides a lawnmower, including a body, an elastic element, a combing component 4, and a braking mechanism. The body includes a frame 1, a cutting mechanism, and a moving mechanism. The moving mechanism is disposed on the frame 1 and used to drive the lawnmower to move. The moving mechanism includes wheels. The combing component 4 is rotatably connected to the frame 1 about a first axis and is located in front of the moving mechanism and the cutting mechanism. The first axis extends in the left-right direction of the frame 1. The elastic element provides a preload force to the combing component 4 to maintain an initial distance between it and the wheels. After being impacted by an external force greater than the preload force, the combing component 4 rotates against the force of the elastic element to trigger the braking mechanism to brake the moving mechanism and / or the cutting mechanism.

[0020] Reference Figure 1 and Figure 2 In this embodiment, the lawnmower is a lawnmower robot. The body is the main structure of the lawnmower, including the body 1, the cutting mechanism, and the moving mechanism. The body 1 is typically made of a plastic or metal shell and houses the power source, control circuitry, etc. The cutting mechanism includes a cutting motor, a blade disc, and cutting blades. The blades are mounted on the blade disc, and the cutting motor drives the blade disc to rotate, thereby causing the blades to rotate and cut the grass stems. The moving mechanism is located at the bottom of the body 1 and is used to drive the lawnmower to move. It includes at least two sets of wheels and a drive motor. Each set of wheels includes two wheels, and the two sets of wheels are spaced apart. The drive motor drives the two sets of wheels to move. The drive motor of the moving mechanism receives signals to control the lawnmower's forward and backward movement.

[0021] The function of the grass comb 4 is to allow grass to pass smoothly through the lawnmower and be trimmed by the cutting mechanism behind it, while effectively blocking larger rigid obstacles such as stones, toys, and tree stumps. In this embodiment, the elastic element is preferably a torsion spring. One torsion arm of the torsion spring rests against the machine body 1, and the other torsion arm rests against the base 41 of the grass comb 4. The preload of the torsion spring ensures that the grass comb 4 maintains an initial distance from the tread of the drive wheel under normal conditions. This distance ensures that the grass comb 4 will not be accidentally triggered when traveling normally on flat ground.

[0022] When the lawnmower is moving normally on the grass, the comb 4 is maintained at a certain distance from the wheel under the preload of the torsion spring. This initial distance is called the initial position, and grass blades can slide through the gaps in the comb teeth 42. When obstacles such as stones appear in front of the lawnmower, the stones will first impact the comb teeth 42 of the comb 4. If the impact force is greater than the preload of the torsion spring, the comb 4 will overcome the force of the torsion spring and rotate backward and upward. As the comb 4 rotates, it triggers the braking mechanism to brake the moving mechanism and / or the cutting mechanism. This effectively prevents stones from entering from below the mower and colliding with the cutting mechanism, breaking the blades.

[0023] Reference Figure 3 and Figure 4 In one embodiment, the braking mechanism includes a sensing component and a controller; the sensing component is signal-connected to the controller, which is used to control the moving mechanism to stop moving and / or the cutting mechanism to stop working, such that after the rotation of the comb 4 triggers the sensing component to generate an electrical signal, the controller receives the electrical signal and controls the moving mechanism to stop moving and / or the cutting mechanism to stop working.

[0024] Specifically, the sensing components include a magnet 51 disposed on the comb 4 and a Hall sensor disposed on the body 1.

[0025] In this embodiment, the Hall sensor is electrically connected to the controller. After the comb 4 collides with the stone, the magnet 51 fixed to it moves as the comb 4 rotates. When the distance between the magnet 51 and the Hall sensor approaches a set threshold, the Hall sensor is triggered, generating an electrical signal with a changing level and sending it to the controller. Upon receiving this signal, the controller immediately determines that a collision has occurred and issues one or both of the following control commands: first, it controls the drive motor of the moving mechanism to stop rotating, thus braking the lawnmower; second, it controls the cutting motor of the cutting mechanism to stop working, thus stopping the blades.

[0026] In other embodiments, the sensing component is not limited to the combination of a Hall sensor and magnet 51, but can also be other non-contact sensors, such as photoelectric sensors, proximity switches, etc., or contact sensors, such as micro switches. When a micro switch is used, a trigger boss can be provided on the body 1. After the comb 4 rotates, it will press the contact of the micro switch, thereby generating an electrical signal.

[0027] In one embodiment, the comb 4 is detachably connected to the body. For example, the comb 4 can be connected to the body 1 by pins or bolts. This design facilitates later maintenance, replacement, or cleaning of the comb 4.

[0028] In one embodiment, when the comb 4 maintains an initial distance from the wheel, the lowest point of the comb 4 is level with or lower than the lowest point of the cutting height of the cutting mechanism. The comb teeth 42, in their initial position, are set to be level with or lower than the lowest point of the cutting height set by the blades of the cutting mechanism. This ensures that the comb 4 can contact lower obstacles before the cutting blades, achieving early warning and braking. In one embodiment, the combing component 4 includes a base 41 and a plurality of comb teeth 42. The base 41 is rotatably connected to the hinge shaft of the body 1. The plurality of comb teeth 42 are spaced apart on the base 41 along the left-right direction of the body 1. The spacing between two adjacent comb teeth 42 is used to allow grass in front of the mower to pass through during the movement of the mower. In this embodiment, the base 41 is detachably connected to the body 1. Rotating holes are respectively provided on both sides of the base 41 along the left-right direction of the body 1, and hinge shafts are respectively provided on both sides of the body 1 along the left-right direction. During installation, the rotating holes are fitted onto the corresponding hinge shafts.

[0029] In one embodiment, the comb teeth 42 are provided with a transition slope 43, the front end of which is higher than the rear end. When the comb teeth 42 collide with an obstacle, the transition slope 43 increases the contact area with the obstacle, thus dispersing the impact force and preventing stress concentration that could break the comb teeth 42.

[0030] Reference Figure 3 and Figure 4 In one embodiment, the machine body further includes an anti-collision mechanism 2, which is disposed in front of the moving mechanism in the direction of movement. The comb component 4 includes a rotating shaft 44, a base 41, and a plurality of comb teeth 42. The base 41 is connected to the rotating shaft 44, and the rotating shaft 44 is rotatably connected to the anti-collision mechanism 2. The plurality of comb teeth 42 are evenly spaced on the side of the base 41 away from the anti-collision mechanism 2, and the comb teeth 42 extend towards the ground.

[0031] In this embodiment, the comb 4 includes a pivot 44, which is directly rotatably connected to the anti-collision mechanism 2, rather than the body 1. The pivot 44 is connected to the base 41. This layout can make more efficient use of the front space, and the anti-collision mechanism 2 itself can also absorb some of the collision energy.

[0032] Specifically, the anti-collision mechanism 2 includes a carrier 21 and an anti-collision member 22. The carrier 21 is connected to the body 1, and the anti-collision member 22 is slidably connected to the carrier 21. A buffer is provided between the carrier 21 and the anti-collision member 22 to buffer the impact when the anti-collision member 22 comes into contact with the carrier 21. The rotating shaft 44 of the combing member 4 is rotatably connected to the carrier 21. In this embodiment, the Hall sensor can be installed on the body 1 or on the carrier 21.

[0033] In other embodiments, the comb 4 also includes a rotating shaft 44, which is directly rotatably connected to the body 1, and the rotating shaft 44 is connected to the base 41.

[0034] In one embodiment, the comb teeth 42 are provided with friction surfaces. When the comb teeth 42 rotate and abut against the tire tread of the wheel, the friction surfaces contact the tire tread. When the comb member 4 rotates at a large angle due to a collision, the bottom or back of the comb teeth 42 will eventually abut against the tire tread of the wheel. At this time, the friction surfaces will generate huge frictional force with the tire tread of the wheel. This frictional force can serve as an auxiliary mechanical braking method, working in conjunction with the aforementioned braking system, or as a safety redundancy in the event of electronic control system failure, ensuring that the wheel can be locked up quickly.

[0035] In this application, "multiple" refers to two or more.

[0036] In this application, unless otherwise expressly defined, the terms "installation," "connection," and "linking" 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 between two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0037] The terms “first,” “second,” “third,” “fourth,” etc., in this application (if present) are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence.

[0038] In this application, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, or B existing alone. Additionally, in this application, the character " / " generally indicates that the preceding and following related objects have an "or" relationship.

[0039] Unless otherwise specified, all steps in this application may be performed sequentially or randomly. For example, if the method includes steps A and B, it means that the method may include steps A and B performed sequentially, or it may include steps B and A performed sequentially. For example, if the method may also include step C, it means that step C may be added to the method in any order. For example, the method may include steps A, B, and C, or it may include steps A, C, and B, or it may include steps C, A, and B, etc.

[0040] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A lawnmower, characterized in that, It includes a body, elastic components, combing components, and a braking mechanism; the body includes a frame, a cutting mechanism, and a moving mechanism. The moving mechanism is disposed on the body and is used to drive the lawnmower to move; the moving mechanism includes wheels. The comb is rotatably connected to the machine body around a first axis and is located in front of the moving mechanism and the cutting mechanism. The first axis extends along the left and right direction of the machine body. The elastic element provides a preload force to the combing component to maintain an initial distance from the wheel; after being impacted by an external force greater than the preload force, the combing component rotates against the force of the elastic element to trigger the braking mechanism to brake the moving mechanism and / or the cutting mechanism.

2. The lawnmower according to claim 1, characterized in that, The braking mechanism includes a sensing component and a controller; the sensing component is signal-connected to the controller, which is used to control the moving mechanism to stop moving and / or the cutting mechanism to stop working, such that after the rotation of the comb triggers the sensing component to generate an electrical signal, the controller receives the electrical signal and controls the moving mechanism to stop moving and / or the cutting mechanism to stop working.

3. The lawnmower according to claim 2, characterized in that, The sensing components include a magnet disposed on the comb and a Hall sensor disposed on the body.

4. The lawnmower according to claim 1, characterized in that, The elastic element is a torsion spring.

5. The lawnmower according to claim 1, characterized in that, The comb is detachably connected to the machine body.

6. The lawnmower according to claim 1, characterized in that, When the combing component maintains an initial distance from the wheel, the lowest point of the combing component is level with or lower than the lowest point of the cutting height of the cutting mechanism.

7. The lawnmower according to claim 1, characterized in that, The grass combing component includes a base and multiple comb teeth. The base is rotatably connected to the hinge shaft of the machine body. The multiple comb teeth are spaced apart on the base along the left-right direction of the machine body. The interval between two adjacent comb teeth is used to allow grass in front of the lawnmower to pass through during the movement of the lawnmower.

8. The lawnmower according to claim 7, characterized in that, The comb teeth are provided with a transition slope, and the front end of the transition slope is higher than the rear end.

9. The lawnmower according to claim 1, characterized in that, The body also includes a collision avoidance mechanism, which is located in front of the moving mechanism in the direction of movement; The comb component includes a rotating shaft, a base, and multiple comb teeth. The base and the rotating shaft are connected, and the rotating shaft is rotatably connected to the anti-collision mechanism. The multiple comb teeth are evenly spaced on the side of the base away from the anti-collision mechanism, and the comb teeth extend towards the ground.

10. The lawnmower according to claim 7, characterized in that, The comb teeth are provided with friction surfaces. When the comb teeth abut against the tire tread of the wheel due to rotation, the friction surfaces come into contact with the tire tread.

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