Automatic lawn mower

Abstract

An automatic lawn mower comprises a shell with a bottom shell, a movable module, a cutting mechanism with a cutting element, and a control module; the automatic lawn mower also comprises a movable protective member provided with a movable protective wall, wherein in the horizontal direction, the movable protective wall is arranged on the outside of the cutting mechanism, and under the action of an external force, the movable protective member can move relative to the bottom shell so that the ground distance of the lower end of the movable protective wall can be changed, and the movable protective wall includes a plurality of blocking protrusions arranged at intervals in the circumferential direction at its bottom, and when the movable protective member is in a free state not subject to external force, the ground distance of the lower end of the blocking protrusion is always less than M, and 38mm≤M≤40mm.

Description

Technical Field

[0001] The invention relates to an automatic lawn mower. Background Art

[0002] With the continuous advancement of computer technology and artificial intelligence, automated lawn mowers, similar to intelligent robots, have begun to gradually enter people's lives. These robots can automatically mow and recharge their lawns without user intervention. This automated system, once set up, eliminates the need for ongoing management, freeing users from tedious and time-consuming chores such as cleaning and lawn maintenance.

[0003] An automatic lawn mower automatically walks on the grass and mows the grass. It includes a cutting element for cutting. In order to prevent the cutting element of the automatic lawn mower from accidentally injuring people's fingers or arms, etc., a protective guard must be provided outside the cutting element to block people's fingers or arms. However, in order to meet the passability of the automatic lawn mower, the protective guard cannot be set too low, because if the protective guard is set too low from the ground, the passability of the automatic lawn mower will be very poor; and in order to meet the passability, the protective guard cannot prevent children's fingers and arms from reaching into the automatic lawn mower, which can easily cause children to be accidentally injured by the automatic lawn mower.

[0004] Therefore, it is necessary to design a kind of automatic lawn mower with new protection assembly to solve the above problems. Summary of the Invention

[0005] In order to overcome the above-mentioned defects, the present invention adopts the following technical solutions:

[0006] An automatic lawn mower comprising:

[0007] A housing, provided with a bottom shell;

[0008] A moving module, disposed below the housing, for driving the automatic lawn mower to move;

[0009] a cutting mechanism, disposed on the housing to perform a cutting task at a predetermined cutting height, the cutting mechanism comprising a cutting element for cutting;

[0010] A control module, configured to autonomously control the movement module to drive the automatic lawn mower to move, and autonomously control the cutting mechanism to perform a cutting task;

[0011] The automatic lawn mower further includes a movable protective member provided with a movable protective wall. Horizontally, the movable protective wall is disposed outside the cutting mechanism. Under the action of an external force, the movable protective member can move relative to the bottom shell so that the distance from the ground of the lower end of the movable protective wall can be changed. The movable protective wall includes a plurality of blocking protrusions that are circumferentially spaced apart at its bottom. When the movable protective member is in a free state without external force, the distance from the ground of the lower end of the blocking protrusion is always less than M, and 38 mm ≤ M ≤ 40 mm.

[0012] Further, when the movable protective member is in a free state without external force, the distance from the ground of the lower end of the blocking protrusion is greater than or equal to M / 2.

[0013] Further, the movable protective wall further includes an upper blocking portion connected above the blocking protrusion. The outermost edge of the blocking protrusion does not completely overlap with the outer edge of the upper blocking portion, and the portion of the blocking protrusion that does not overlap with the outermost edge of the upper blocking portion is located inside the corresponding portion of the outermost edge of the upper blocking portion.

[0014] Further, the height h of the blocking protrusion ranges from: 0 mm < h ≤ 80 mm, or 3 mm ≤ h ≤ 20 mm; the width M of the blocking protrusion ranges from 0 < m ≤ 40 mm, or 0 < m ≤ 20 mm; the distance S between two adjacent blocking protrusions ranges from 0 < S ≤ 40 mm, or 3 ≤ S ≤ 25 mm.

[0015] Further, the movable protective wall further includes a connecting protrusion that extends in the up and down direction and is used to connect two adjacent blocking protrusions. The connecting protrusion is partially recessed inward so that the connecting protrusion and the two adjacent blocking protrusions it connects jointly form a structure with an outer interval and an inner closure.

[0016] Further, the distance d between the outermost side of the blocking protrusion and the innermost side of the connecting protrusion ranges from: 1 mm ≤ d ≤ 100 mm, or 3 mm ≤ d ≤ 20 mm; the height h of the blocking protrusion ranges from: 0 mm < h ≤ 80 mm, or 3 mm ≤ h ≤ 20 mm; the width M of the blocking protrusion ranges from 0 < m ≤ 40 mm, or 0 < m ≤ 20 mm; the distance S between two adjacent blocking protrusions ranges from 0 < S ≤ 40 mm, or 3 ≤ S ≤ 25 mm.

[0017] Further, the connecting protrusion includes a V-shaped structure connecting two adjacent blocking protrusions.

[0018] Further, the outermost edge of the blocking protrusion includes a safety locking area for preventing the upward movement of the movable protective wall.

[0019] Furthermore, the safety locking area includes an inclined surface extending downward from the outside to the inside, and the angle of the inclined surface of the safety locking area from the vertical plane at its outermost end to the inside is less than or equal to 15 degrees.

[0020] Furthermore, the angle at which the inclined surface of the safety locking zone is inclined inward from the vertical plane where its outermost end is located is less than or equal to 3 degrees.

[0021] Furthermore, the safety locking area includes a vertical surface or an inclined surface extending upward from the outside to the inside.

[0022] Furthermore, the movable protective wall includes a main movable part located above the blocking protrusion, the main movable part includes an obstacle passing area located at its outermost edge, the obstacle passing area includes an inclined surface extending downward from the outside to the inside, the lower end of the safety locking area is less than M from the ground, and the safety locking area is located on the outside of the downward extension line of the obstacle passing area on the same radial direction.

[0023] Furthermore, the movable protective wall includes at least one of a front movable protective wall located in front of the cutting mechanism, side movable protective walls located on both sides of the cutting mechanism, and a rear movable protective wall located behind the cutting mechanism.

[0024] Furthermore, the blocking protrusions are distributed at intervals along the circumferential direction at the bottom end of the entire movable protective wall.

[0025] Furthermore, the movable protective member is arranged on the outside of the shell, and / or is arranged between the cutting mechanism and the shell and / or is connected to a part of the shell. In the horizontal direction, the minimum distance X between the outermost edge of the blocking protrusion and the cutting element is in the range of X≥58mm, or 63mm≤X≤75mm.

[0026] Furthermore, when the movable protective member moves upward due to an external force, the distance between the lower end of the blocking protrusion and the ground may be greater than or equal to M.

[0027] Furthermore, when the movable protective member is moved upward by an external force, the lower end of the blocking protrusion can move in the vertical direction by a distance ranging from 15 to 80 mm, or from 20 to 40 mm.

[0028] The beneficial effect of this solution is that a plurality of blocking protrusions arranged at intervals in the circumferential direction at the bottom thereof can prevent the fingers and arms of children who are illegally pointing upwards from being inserted into the cutting mechanism and causing accidental injuries. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 It is a three-dimensional diagram of an automatic lawn mower according to an embodiment of the present invention.

[0030] Figure 2 yes Figure 1 Another angle view of the robotic lawn mower is shown.

[0031] Figure 3 yes Figure 1 Another angle view of the robotic lawn mower is shown.

[0032] Figure 4 This is a schematic diagram of a state of a protective component of an automatic lawn mower in one embodiment of the present invention.

[0033] Figure 5 This is a schematic diagram of a state of a protective component of an automatic lawn mower in one embodiment of the present invention.

[0034] Figure 6 This is a schematic diagram of a state of a protective component of an automatic lawn mower in one embodiment of the present invention.

[0035] Figure 7 This is a schematic diagram of a state of a protective component of an automatic lawn mower in one embodiment of the present invention.

[0036] Figure 8 This is a schematic diagram of a state of a protective component of an automatic lawn mower in one embodiment of the present invention.

[0037] Figure 9 This is a schematic diagram of a state of a protective component of an automatic lawn mower in one embodiment of the present invention.

[0038] Figure 10 Schematic diagram showing the cutting mechanism and protective components of an automatic lawn mower located on one side in one embodiment of the present invention.

[0039] Figure 11 Schematic diagram of a cutting mechanism and a movable protective member of an automatic lawn mower according to an embodiment of the present invention.

[0040] Figure 12 This is a schematic diagram of a state of a protective component of an automatic lawn mower in one embodiment of the present invention.

[0041] Figure 13 This is a schematic diagram of a state of a protective component of an automatic lawn mower in one embodiment of the present invention.

[0042] Figure 14 This is a schematic diagram of a state of a protective component of an automatic lawn mower in one embodiment of the present invention.

[0043] Figure 15 This is a schematic diagram of a state of a protective component of an automatic lawn mower in one embodiment of the present invention.

[0044] Figure 16 Schematic diagram of a protective component of an automatic lawn mower according to an embodiment of the present invention.

[0045] Figure 17 Schematic diagram of a protective component of an automatic lawn mower according to an embodiment of the present invention.

[0046] Figure 18 Schematic diagram of a protective component of an automatic lawn mower according to an embodiment of the present invention.

[0047] Figure 19 Schematic diagram of a protective component of an automatic lawn mower according to an embodiment of the present invention.

[0048] Figure 20 Schematic diagram of a protective component of an automatic lawn mower according to an embodiment of the present invention.

[0049] Figure 21 This is a schematic diagram of a state of a protective component of an automatic lawn mower in one embodiment of the present invention.

[0050] Figure 22 yes Figure 21 Another angle view shown.

[0051] Figure 23 Schematic diagram of the outermost edge of the movable protective element in one embodiment of the present invention.

[0052] Figure 24 Schematic diagram of an automatic lawn mower according to an embodiment of the present invention.

[0053] Figure 25 yes Figure 24 Schematic diagram of another state of the automatic lawn mower shown.

[0054] Figure 26 yes Figure 24 Schematic diagram of another state of the automatic lawn mower shown.

[0055] Figure 27 Schematic diagram of an automatic lawn mower according to an embodiment of the present invention.

[0056] Figure 28 yes Figure 27 Schematic diagram of another state of the automatic lawn mower shown.

[0057] Figure 29 yes Figure 27 Schematic diagram of another state of the automatic lawn mower shown.

[0058] Figure 30 Schematic diagram of an automatic lawn mower according to an embodiment of the present invention.

[0059] Figure 31 yes Figure 30 Schematic diagram of the automatic lawn mower being lifted.

[0060] Figure 31 yes Figure 30Schematic diagram of the automatic lawn mower being lifted.

[0061] Figure 32 Schematic diagram of a movable protective element and a mechanical protective element in one embodiment of the present invention.

[0062] Figure 33 for Figure 32 The diagram shows the force acting on the movable protective member when it is subjected to illegal outward force.

[0063] Figure 34 for Figure 32 The diagram shows the force acting on the movable protective member when it is subjected to illegal outward force.

[0064] Figure 35 Schematic diagram of a movable protective member and a mechanical protective member with a blocking protrusion in one embodiment of the present invention.

[0065] Figure 36 for Figure 35 The diagram shows the force acting on the movable protective member when it is subjected to illegal outward force.

[0066] Figure 37 for Figure 35 The diagram shows the force acting on the movable protective member when it is subjected to illegal outward force.

[0067] Figure 38 for Figure 35 The force diagram of the movable protective member shown is when it is subjected to an illegal outward force when the distance between the movable protective member and the ground is less than or equal to M / 2.

[0068] Figure 39 for Figure 35 The force diagram of the movable protective member shown is when it is subjected to an illegal outward force when the distance between the movable protective member and the ground is less than or equal to M / 2.

[0069] Figure 40 Schematic diagram of a movable protective member and a mechanical protective member with a connecting protrusion in one embodiment of the present invention.

[0070] Figures 41 to 43 for Figure 40 The diagram shows the state of the grass when the movable guard encounters the grass.

[0071] Figure 44 for Figure 40 A partial enlarged view of .

[0072] Figure 45 Schematic diagram of a movable protective member and a mechanical protective member with a connecting protrusion in another embodiment of the present invention. DETAILED DESCRIPTION

[0073] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0074] like Figures 1 to 20 As shown, the present invention provides an automatic operating system, which includes an autonomously moving and operating automatic lawn mower 1 and a charging station for charging the automatic lawn mower 1. The automatic lawn mower 1 includes a housing 10 having a bottom shell 101, a movement module 20 disposed below the housing 10 and configured to move the automatic lawn mower 1, a cutting mechanism 3 configured to perform cutting tasks at a predetermined cutting height, a power module configured to provide power, a control module configured to automatically control the movement module to move the automatic lawn mower 1 and autonomously control the cutting mechanism to perform cutting tasks, and an energy module 5 configured to provide energy.

[0075] The cutting mechanism 3 is rotatably fixed below the housing 10. The cutting mechanism 3 includes a cutter disc 31 rotatably fixed below the housing 10, a plurality of cutting elements 32 fixed to the cutter disc 31, and fasteners 33 for securing the cutting elements 32 to the cutter disc 31. In this embodiment, the cutting mechanism 3 also includes a rotating portion 36 rotatably fixed below the housing 10. The cutter disc 31 is fixed to the rotating portion 36 and can rotate with the rotating portion 36. The cutting elements 32 are cutting blades that are evenly fixed around the circumference of the cutter disc 31 so as to rotate with the cutter disc 31. In one embodiment, the cutting mechanism 3 includes three cutting blades. In other embodiments, the number of cutting blades can be determined based on actual conditions, for example, two or more cutting elements can be provided.

[0076] The height of the cutting mechanism 3 relative to the ground is adjustable, allowing the automatic lawn mower 1 to achieve different cutting heights when mowing. Specifically, there are various ways to adjust the height of the cutting mechanism 3. In one embodiment, the automatic lawn mower 1 further includes a height adjustment mechanism 6 for adjusting the height of the cutting mechanism (height adjustment). When the cutting height of the automatic lawn mower 1 needs to be adjusted, the height adjustment mechanism 6 is operated, and the cutting mechanism 3, driven by the height adjustment mechanism 6, moves up and down to adjust the height of the cutting mechanism 3 and thus the height of the grass being cut. During the process of adjusting the cutting height from the lowest to the highest setting, the cutting mechanism 3 may move vertically relative to the movable guard. For example, the cutting mechanism 3 moves vertically relative to the housing 10, and the cutting mechanism 3 moves vertically relative to the ground, while the movable guard 41 remains stationary vertically relative to the ground. In other words, the initial distance between the lower end of the movable guard wall and the ground remains unchanged. The movable guard 41 remains in its lowest position 411, so that height adjustment does not affect the safety and protection of the automatic lawn mower 1. In this embodiment, during the process of adjusting the cutting height from the lowest gear to the highest gear, the initial distance between the lower end of the movable protective wall and the ground remains unchanged; in other embodiments, during some gear adjustments, the initial distance between the lower end of the movable protective wall and the ground remains unchanged, while during some gear adjustments, the initial distance between the lower end of the movable protective wall and the ground changes. In another embodiment, the automatic lawn mower 1 can also adjust the distance between the cutting element 32 and the ground by reversing the blade disc 31 or replacing it with a new blade disc 31, so as to achieve the purpose of adjusting the cutting height. In this embodiment, when adjusting the cutting height, the movable protective member 41 is not changed, that is, the positional relationship between the movable protective member 41 and the housing 10 remains unchanged, and the blade disc 31 is directly replaced. Of course, in some embodiments, the height of the cutting mechanism 3 relative to the ground can also be always fixed and cannot be adjusted.

[0077] In the non-heightened state, the cutting mechanism 3 can be fixed relative to the housing or can be movable relative to the housing. For example, the cutting mechanism 3 can move in the vertical direction relative to the housing. When an external force acts on the cutting mechanism 3, for example, when an obstacle below the cutting mechanism 3 exerts an upward force on it, the cutting mechanism 3 can move upward relative to the housing to avoid the obstacle, prevent the obstacle from colliding with the blade, and improve passability.

[0078] like Figure 2 and Figure 3As shown, the automatic lawn mower 1 also includes a protective assembly 4 with a protective wall 40 for safety. This protective wall is horizontally positioned outside the cutting mechanism 3 to prevent accidental injury from accidentally striking the cutting mechanism 3 from the outside. The protective assembly 4 includes at least a movable protective member 41 equipped with a movable protective wall 414 for safety. The protective wall 414 is positioned on the movable protective member 41 and horizontally positioned outside the cutting mechanism 3. During movement of the automatic lawn mower 1, the movable protective wall 414 can change its vertical distance from the ground when subjected to appropriate external forces. This allows the movable protective wall 414 to be applied with sufficient external force when the automatic lawn mower 1 encounters an obstacle 62, increasing the distance between the lower end 417 of the movable protective wall of the movable member 41 and the ground, allowing the automatic lawn mower 1 to quickly pass through the obstacle, thereby improving its maneuverability. The lower end of the movable protective wall 414 may also be referred to as a movable protective wall lower end 417 .

[0079] A maximum child's arm diameter M is preset. Regardless of the cutting height of the cutting mechanism 3, or in other words, at any cutting height, when the guard assembly 4 is free and unaffected by external forces, the distance between the lower end of the guard assembly 4 and the ground is the initial distance. This initial distance is always less than M. This prevents a child's arm from passing through the bottom of the movable guard 4 and into the vicinity of the cutting mechanism 3 within the automatic lawn mower 1, potentially creating a risk of accidental injury from the cutting mechanism 3. Generally, the maximum child's arm diameter M ranges from 38 mm to 40 mm (inclusive), i.e., 38 mm ≤ M ≤ 40 mm. The distance between the lower end of the guard assembly 4 and the ground can be set to 15 mm, 19 mm, 25 mm, 35 mm, 37 mm, 39 mm, and so on. Of course, in other embodiments, the range of M can be adjusted based on actual circumstances. For example, M can be set smaller to protect thinner arms, or larger to protect thicker arms. Taking M=38mm as an example, that is, the distance between the lower end of the protective component 4 and the ground is always less than 38mm. The free state of the protective component 4 refers to the state of the protective component 4 when the automatic lawn mower 1 is not subjected to any external force, regardless of the cutting height of the cutting mechanism 3. When the protective component 4 is in the free state, when an arm with a diameter greater than M attempts to extend into the automatic lawn mower 1 from under the movable protective part 41, it is blocked by the lower end of the protective component 4 and cannot extend the arm into the movable protective part 41. In one embodiment, the distance between the lower end of the protective component 4 and the ground is within the range of 15 to 35mm, so that the distance between the lower end of the protective component 4 and the ground can prevent children's arms from extending in, and will not affect their normal walking on the grass due to the protective component 4 being too close to the ground.

[0080] There are many ways to change the distance between the lower end 417 of the movable protective wall of the movable protective member 41 and the ground. For example, the movable protective member 41 can move in the up and down directions compared to the bottom shell to change the distance between the lower end of the movable protective wall and the ground; for example, the movable protective member 41 can move in the up and down directions as a whole compared to the bottom shell, so that the movable protective wall as a whole moves in the up and down directions compared to the ground; or, the movable protective member 4 only partially moves in the up and down directions compared to the bottom shell, so that the distance between the local movable protective wall and the ground can be changed; or, the distance between the upper end of the movable protective member 4 and the ground remains unchanged, while the distance between the lower end 417 of the movable protective wall and the ground can be changed. For example, the distance between the lower end 417 of the movable protective wall and the ground can be generated by rotation or deformation.

[0081] In one embodiment, if Figures 1 to 18 As shown, the bottom shell of the housing 10 does not move in the vertical direction relative to the ground, while the movable protective member 41 can move in the vertical direction relative to the bottom shell of the housing 10 to achieve its vertical movement relative to the ground. Figures 1 to 3 As shown, the movable protective member 41 is arranged between the housing 10 and the cutting mechanism 3, and is arranged independently of the housing 10. Figures 16 and 17 As shown, the movable protective member 41 is disposed outside the housing 10, and the movable protective member 41 can move in the up and down directions relative to the bottom shell of the housing 10. Figures 16 and 17 As shown, it is completely covered outside the shell 10 to form the upper cover of the automatic lawn mower 1, and can also be as shown in FIG. Figure 18 The movable protective member 41 is disposed on a portion of the housing 10 , for example, at the edges of the front, rear, and sides of the housing 10 .

[0082] In another embodiment, the movable protective member 41 may be fixed relative to the housing, and the distance of the housing 10 relative to the ground may be variable. For example, the connection between the mobile module and the housing 10 may be changed, so that the distance of the housing 10 relative to the ground may be changed. Figures 19 to 20 As shown, the distance between the upper end of the movable protective member 41 and the ground remains constant, while the distance between the lower end 417 of the movable protective wall and the ground changes by deforming the movable protective member 41 when it strikes an obstacle. In another embodiment, the distance between the upper end of the movable protective member 41 and the ground remains constant, and the upper end of the movable protective member 41 is fixed relative to the housing 10, while the distance between the lower end 417 of the movable protective wall and the ground changes by rotating the movable protective member 41 about its upper end. In other embodiments, the movable protective member 41 may also use other methods to achieve a variable distance between the lower end 417 of the movable protective wall and the ground, which are not listed here.

[0083] The cutting element 32 includes a cutting element lowest point 30 located at its lowest position in the vertical direction. Regardless of the cutting height of the cutting mechanism 3, when the automatic lawn mower 1 is in motion, when it encounters a child's arm, such as Figure 8 When the diameter of the test arm 61 is M, the test arm 61 is equivalent to the obstacle 62, and the force exerted by the test arm 61 on the movable protective wall 414 is sufficient to move the movable protective wall 414 upward. When the movable protective wall 414 is subjected to external force and its lower end moves upward, if the lower end of the protective component 4 is greater than or equal to M from the ground, for example, the distance between the lower end 417 of the movable protective wall and the ground is greater than or equal to M, and the lower end of the protective component 4 moves to a position higher than the lowest point 30 of the cutting element, then when the automatic lawn mower 1 encounters a child's arm during movement, it will be directly crushed, and the arm can pass through the protective component 4 and directly enter the vicinity of the cutting mechanism 3, and be cut by the cutting element 32. In this embodiment, if Figure 8 、 Figure 11 As shown, the movable guard 41 is in a free state, and the lower end 417 of the movable guard wall is lower than the lowest point of the cutting element. When the movable guard 41 is subjected to a force applied from the outside to the inside and moves upward to the highest point of its movable range, the lower end of the blocking wall 40 of the guard assembly 4 is always lower than the lowest point 30 of the cutting element. Therefore, during the movement of the automatic lawn mower 1, even if a child's arm (simulated by the test arm 61) is encountered, even if the arm can enter the vicinity of the cutting mechanism 3 from the guard assembly 4, because the lower end of the guard wall 40 of the guard assembly 4 is always lower than the lowest point 30 of the cutting element, the test arm 61 can only be located below the cutting element 30 and cannot touch the cutting element 32, thereby avoiding being cut. Of course, in other embodiments, the cutting mechanism can be restricted to any height, or in other words, the cutting mechanism 3 can be restricted to any cutting height. When the movable protective member 41 is subjected to external force, no matter how the distance between the lower end 417 of the movable protective wall and the ground changes, the distance between the lower end of the blocking wall 40 of the protective component 4 and the ground is always less than M. Specifically, the arm can be restricted from extending from the bottom of the protective component 4 into the cutting mechanism 3 by restricting the distance between the lower end 417 of the movable protective wall and the ground to always be less than M.

[0084] Since the lower end of the barrier wall 40 of the protection assembly 4 is always lower than the lowest point 30 of the cutting element, the test arm 61 can only be located below the cutting element 30. Figure 8 The figure shows a schematic diagram of a cutting height higher than the diameter of a child's arm. At this time, the height of the cutting mechanism 3 from the ground is greater than the diameter of a child's arm.

[0085] Specifically, there are various ways to ensure that the lower end of the barrier wall 40 of the protective assembly 4 is always below the lowest point 30 of the cutting element. For example, in one embodiment, when the movable protective member 41 is forced to move upward, its upward movement is restricted, so that the lower end 417 of the movable protective wall is always located at the lowest point 30 of the cutting element. In another embodiment, the movable protective member 41 can be made to move synchronously with the cutting mechanism 3, so that the distance between the lower end 417 of the movable protective wall and the lowest point 30 of the cutting element remains unchanged, thereby ensuring that the lower end 417 of the movable protective wall is always located at the lowest point 30 of the cutting element. In another embodiment, a mechanism protective member 42 can be added, the lower end of which is always below the lowest point 30 of the cutting element, to ensure that the lower end of the barrier wall 40 of the protective assembly 4 is always below the lowest point 30 of the cutting element, and so on.

[0086] The following describes a mechanism guard 42, whose lower end is always below the lowest point 30 of the cutting element, as an example. In this embodiment, the guard assembly 4 also includes a mechanism guard 42 having a mechanism guard wall 424. Horizontally, the mechanism guard wall 424 of the robotic lawn mower is positioned between the cutting mechanism 3 and the movable guard wall. The guard wall 40 includes the movable guard wall and the mechanism guard wall 424. The mechanism guard 42 is fixed relative to the cutting mechanism 3. The cutting mechanism 3 can move relative to the housing or remain stationary, depending on the situation. When the cutting mechanism 3 moves relative to the housing, the mechanism guard 42 moves with it. When the cutting mechanism 3 remains stationary relative to the housing, the mechanism guard 42 also remains stationary. In this embodiment, the mechanism guard 42 is completely fixed relative to the cutting mechanism 3 and cannot move relative to it in any direction. However, in other embodiments, the mechanism guard 42 can be fixed only in the vertical direction relative to the cutting mechanism 3, allowing the two to move relative to each other in directions other than the vertical direction. The mechanism guard 42 includes a mechanism protection wall 424 for protection. The cutting mechanism 3 includes a cutting element lowest point 30 at its lowest vertical position. The mechanism guard 42 is fixed relative to the cutting mechanism 3 in the vertical direction. That is, the relative position of the mechanism guard 42 and the cutting mechanism 3 remains unchanged in the vertical direction. The lower end of the mechanism protection wall 424 of the mechanism guard 42, namely the mechanism protection wall lower end 427, is always lower than the cutting element lowest point 30. This ensures that the lower end of the protection wall 40 is always lower than the cutting element lowest point 30, preventing children's arms from being crushed by the robotic lawn mower 1.

[0087] like Figure 4 and Figure 6As shown, horizontally, the mechanism guard 42 is located between the cutting mechanism 3 and the movable guard 41. The minimum horizontal spacing between the movable guard 41 and the mechanism guard 42 is 2 to 30 mm, so that the movable guard 41 does not interfere with the mechanism guard 42 during upward movement. In one embodiment, the minimum distance between the movable guard 41 and the mechanism guard 42 is 2 to 8 mm. While ensuring that the movable guard 41 and the mechanism guard 42 do not interfere with each other during movement, the spacing between the movable guard 41 and the mechanism guard 42 is reduced, making the overall structure of the automatic lawn mower 1 more compact.

[0088] The mechanism guard 42 includes a mechanism guard wall 424 and a fixed connecting wall 425 for connecting the mechanism guard wall 424 to the housing 10. In the vertical direction, the mechanism guard wall 424 is fixed relative to the blade disc 31, that is, the relative position of the mechanism guard wall 424 and the blade disc 31 in the vertical direction remains unchanged. The mechanism guard wall 424 includes a plurality of fixed guard teeth 4246, a plurality of fixed grass inlets 4247 located between two adjacent fixed guard teeth 4246, and a connecting portion 4248 for connecting adjacent fixed guard teeth 4246. The width of the fixed grass inlet 4247 is 1 to M, and the width of the fixed guard teeth 4246 is 1 to 20 mm. While allowing grass to enter, it prevents children's arms from passing through the fixed grass inlet 4247 through the mechanism guard 41 and touching the cutting mechanism 3. If the fixed grass inlet 4247 is too wide, the effective length of the fixed guard teeth 4246 will be reduced. In one embodiment, the width of the fixed grass inlet 4247 is 10 to 25 mm. While ensuring the effective length of the fixed guard teeth 4246, it prevents a child's arm from passing through the fixed grass inlet 4247 through the mechanism guard 42. At the same time, during the movement of the automatic lawn mower 1, the amount of grass entering the cutting mechanism 3 through the fixed grass inlet 4247 is appropriate, avoiding the phenomenon of too little grass entering, resulting in low work efficiency or grass blockage. The width of the fixed guard teeth 4146 is 4 to 10 mm. While improving the rigidity of the fixed guard teeth 4246, it also prevents the fixed guard teeth 4246 from being too wide, resulting in grass blockage. In one embodiment, the movable guard member 41 also includes a plurality of movable guard teeth 4146, a plurality of fixed grass inlets 4147 located between two adjacent movable guard teeth 4146, and a connecting portion 4148 for connecting adjacent movable guard teeth 4146. In the direction of travel of the automatic lawn mower 1, the fixed grass inlets 4247 and the movable grass inlets 4147 are arranged in a front-to-rear correspondence, so that grass can pass through the movable grass inlets 4147 and the fixed grass inlets 4247 in a straight line, thereby preventing grass from getting stuck. The fixed guard teeth 4246 and the movable guard teeth 4146 are respectively distributed along the circumference of the outer side of the cutting mechanism 3 to form a safety guard outside the cutting mechanism 3.

[0089] like Figure 21 and Figure 22 As shown, in the forward direction of the robotic lawn mower 1, the mechanism protection walls 424 include a front mechanism protection wall 4241 located in front of the cutting mechanism 3, side mechanism protection walls 4243 located on both sides of the cutting mechanism, and a rear mechanism protection wall 4242 located behind the cutting mechanism. The lower ends 427 of the front mechanism protection wall 4241, the rear mechanism protection wall 4242, and the side mechanism protection walls 4243 are all lower than the lowest point 30 of the cutting element.

[0090] In this embodiment, in order to ensure that the child's arms cannot touch the cutting element 30 when extended from any direction, the mechanism guard 42 can be surrounded by a mechanism guard wall, that is, Figure 21 and Figure 22 As shown, in the forward direction of the robotic lawn mower 1, the front mechanism protection wall 4241, the rear mechanism protection wall 4242, and the side mechanism protection wall 4243 collectively form a circumferentially closed mechanism protection wall. The lower ends of the front mechanism protection wall 4241, the rear mechanism protection wall 4242, and the side mechanism protection wall 4243 are all lower than the lowest point 30 of the cutting element. In this embodiment, the lowest bottom of the mechanism protection wall along the 360-degree circumference is lower than the lowest point 30 of the cutting element. In another embodiment, the lowest bottom of the mechanism protection wall along the 360-degree circumference is at least partially above and at least partially below the lowest point of the cutting element, and the portion above the lowest point of the cutting element continuously extends circumferentially for a length less than M, thereby preventing children's arms from reaching in. In other embodiments, the mechanism protection wall 424 includes at least one of the front mechanism protection wall 4241 located in front of the cutting mechanism 3, the side mechanism protection walls 4243 located on both sides of the cutting mechanism, and the rear mechanism protection wall 4242 located behind the cutting mechanism.

[0091] In one embodiment, if Figure 1As shown, the mechanism protection wall 424 includes at least one of a front mechanism protection wall 4241 located in front of the cutting mechanism 3 and side mechanism protection walls 4243 located on either side of the cutting mechanism 3, thereby preventing children's arms from reaching into the vicinity of the cutting mechanism 3 from the front or rear and being cut. Since the direction of the externally applied force from the rear of the automatic lawn mower 1, which is opposite to the direction of movement of the obstacle 62 relative to the automatic lawn mower 1 (from the inside out), can be used to separate the externally applied force from the obstacle 62. For example, the rear of the automatic lawn mower 1 can prevent children's arms from being injured by limiting the resistance to the movable protection wall 414 when it moves upward from the outside inward, thereby preventing the lower end 417 of the movable protection wall from moving upward or preventing it from moving upward beyond the lowest point 30 of the cutting element. Since the direction of the force applied from outside to inside in the front of the automatic lawn mower 1 is the same as the direction of movement of the obstacle 62 relative to the automatic lawn mower 1, the direction of the force applied from outside to inside on both sides is not completely opposite to the direction of movement of the obstacle 62 relative to the automatic lawn mower 1, and it is impossible to distinguish the force from outside to inside from the obstacle 62. Therefore, in this embodiment, a front mechanism protective wall 4241 and / or a side mechanism protective wall 4243 can be added to the front and both sides of the automatic lawn mower 1.

[0092] like Figures 1 to 3 As shown, the shell 10 includes a high shell 49 located outside the cutting mechanism 3 in the horizontal direction. In the direction from the outside to the inside (in the horizontal direction) and in the range of M extending perpendicular to the direction from the outside to the inside, the distance between the high shell 49 and the ground is always higher than M. Therefore, at this time, a child's arm can pass from the bottom of the high shell 49 to the vicinity of the cutting element 32 and be cut. Therefore, in the horizontal direction, or in the inside and outside directions of the automatic lawn mower, at least part of the mechanism protection wall 424 is located between the high shell 49 and the cutting mechanism 3 to prevent the child's arm from reaching the vicinity of the cutting element 32 from the bottom of the high shell 49 and being cut.

[0093] In other embodiments, different implementations may be selected according to the movement of the movable protective member 41 to ensure that the lower end of the protective assembly 4 is always lower than the lowest point 30 of the cutting element.

[0094] The following is a specific description of the example in which the movable protective member 41 can move in the up and down directions relative to the bottom shell of the housing 10 under the action of an external force to change the distance between the lower end of the movable protective wall and the ground.

[0095] like Figures 1 to 3As shown, the movable protective member 41 includes a plurality of movable protective walls 414 for blocking a user's arms, fingers, or other foreign objects, and a movable connecting wall 415 for connecting the movable protective walls to the housing. The movable protective walls 414 include at least one of a front movable protective wall 4141 disposed in front of the cutting mechanism 3, side movable protective walls 4142 disposed on both sides of the cutting mechanism 3, and a rear movable protective wall 4143 disposed behind the cutting mechanism 3. In this embodiment, the movable protective wall 414 includes the front movable protective wall 4141, the side movable protective walls 4142, and the rear movable protective wall 4143 as an example. Among them, the front movable protective wall 4141, the side movable protective wall 4142 and the rear movable protective wall 4143 can be fully or partially connected to each other into one body, and then connected to the shell 10 through the movable connecting wall 415. The front movable protective wall 4141, the side movable protective wall 4142 and the rear movable protective wall 4143 can also not be connected to each other, but be connected to the shell 10 through the movable connecting wall 415 respectively. The front movable protective wall 4141, the side movable protective wall 4142 and the rear movable protective wall 4143 can be directly extended from the movable connecting wall 415, or they can be formed separately and then assembled on the movable connecting wall 415. The movable protective wall 414 includes a plurality of movable protective teeth 4146 and a plurality of movable grass inlets 4147 located between two adjacent movable protective teeth 4146. As Figure 1As shown, in one embodiment, only the front movable protective wall 4141 is provided with a plurality of movable protective teeth 4146 and a movable grass inlet 4147. This allows grass to enter the cutting mechanism 3 through the movable grass inlet 4147 without being blocked by the movable protective teeth 4146 when the automatic lawn mower 1 moves forward. In other embodiments, the rear movable protective wall 4143 and the side movable protective walls 4142 may also be provided with a plurality of movable grass inlets 4147 to prevent grass from being compressed. The width of the movable grass inlet 4147 is 1 to 20 mm, and the width of the movable protective teeth 4146 is 1 to 20 mm. While allowing grass to enter, it prevents a child's arm from passing through the movable protective member 41 through the movable grass inlet 4147 and touching the cutting mechanism 3. If the movable grass inlet 4147 is too wide, the effective length of the movable guard teeth 4146 will be reduced. In one embodiment, the width of the movable grass inlet 4147 is 10 to 25 mm. While ensuring the effective length of the movable guard teeth 4146, it prevents a child's arm from passing through the movable guard 41 through the movable grass inlet 4147. At the same time, during the movement of the automatic lawn mower 1, the amount of grass entering the cutting mechanism 3 through the movable grass inlet 4147 is appropriate, avoiding the phenomenon of too little grass entering, resulting in low work efficiency or grass blockage. The width of the movable guard teeth 4146 is 4 to 10 mm. While improving the rigidity of the movable guard teeth 4146, it also prevents the movable guard teeth 4146 from being too wide, resulting in grass blockage.

[0096] The movable guard 41 is movable relative to the bottom shell 101 of the housing 10 in the vertical direction, and the movable guard wall 414 is also movable relative to the bottom shell of the housing 10. This allows the movable guard wall 414 of the movable guard 41 to move upward when the automatic lawn mower 1 encounters an obstacle 62 within a certain range, thereby ensuring the automatic lawn mower's ability to pass smoothly. In this embodiment, the movable guard 41, under the influence of external forces such as obstacles, can move upward relative to the bottom shell 101 as a whole, thereby increasing the ground clearance of all points on the lower surface of the movable guard wall. This allows the automatic lawn mower to quickly pass through obstacles, significantly improving the automatic lawn mower's overall ability to pass smoothly. The movable guard 41 has a lowest state 411 and a highest state 412 within the movable range. The lowest state 411 refers to the lowest position of the movable guard 41 in the space where it can move in the vertical direction during the movement of the automatic lawn mower. The highest state 412 refers to the highest position of the movable guard 41 in the space where it can move in the vertical direction during the movement of the automatic lawn mower. It should be pointed out that the lowest position and the highest position both refer to the range of the movable guard 41 that is caused by the external force naturally encountered during the movement of the automatic lawn mower or the external force in the same direction as the naturally applied external force, for example, the movable guard 41 is subjected to the external force applied by an obstacle, or the buoyancy of the grass on it, etc.; and does not include the situation where the movable guard wall is forced to move downward by the downward external force artificially applied to the movable guard 41. Figure 4 As shown in FIG. 4 , it is a schematic diagram of the movable protective element 41 being in the lowest state 411 within its movable range. Figure 5 The figure shows the movable guard 41 in its highest position 412 within its movable range. When the movable guard 41 is in its lowest position 411, the distance between the lower end 417 of the movable guard wall and the ground is H1. When the movable guard 41 is in its highest position 412, the distance between the lower end 417 of the movable guard wall and the ground is H2. When the robotic lawn mower 1 is moving on flat grass or passing over an obstacle 62 with a height less than or equal to H1, the movable guard 41 is in its lowest position 411. When passing over an obstacle 62 with a height greater than H1 and less than H2, the movable guard 41 is subjected to the force exerted by the obstacle 62, moving upward to quickly pass over the obstacle 62.

[0097] In this embodiment, the movable guard 41 has a free state. This free state refers to the state of the movable guard 41 when the automatic lawn mower 1 is not subject to external forces at its corresponding cutting height. The free state of the movable guard 41 can be the same at different cutting heights, meaning that adjusting the height of the cutting mechanism 3 does not affect the free state of the movable guard 41. Of course, in other embodiments, the free state of the movable guard 41 may also be affected by height adjustment. However, to prevent a child's arm from reaching under the movable guard 41 when the automatic lawn mower 1 is stationary, it is necessary to ensure that, at any cutting height, the initial distance H0 between the lower end 417 of the movable guard wall and the ground is always less than M when the movable guard 41 is in the free state. In the above embodiment, M is set to 38 mm, that is, the initial distance between the lower end 417 of the movable protective wall and the ground is always less than 38 mm. Of course, the initial distance between the lower end 417 of the movable protective wall and the ground is always less than 38 mm as a preferred value. In other embodiments, M may also be between 38 mm and 40 mm (including 38 mm and 40 mm). Correspondingly, the distance between the lower end 417 of the movable protective wall and the ground only needs to be always less than M. For example, when M is 40 mm, the distance between the lower end 417 of the movable protective wall and the ground is always less than 40 mm. In the following embodiments, the initial distance between the lower end 417 of the movable protective wall and the ground is always less than 38 mm as an example.

[0098] In one embodiment, the initial distance between the lower end 417 of the movable protective wall and the ground is within a range of 15mm-35mm. This ensures that the distance below the protective element 41 is sufficient to prevent a child's arm from reaching into the ground, while also preventing the movable protective wall 414 from being too close to the ground and affecting the child's ability to walk on the grass. The distance between the lower end 417 of the movable protective wall and the ground can be further limited to a range of 19mm-30mm. On the one hand, limiting the ground distance to greater than 19mm increases the ground clearance of the lower end 417 of the movable protective wall, improving passability. On the other hand, limiting the ground clearance to less than 30mm ensures that the difference between the ground clearance and the diameter of a child's arm is greater than a certain value, leaving a certain safety margin to ensure that a child's fingers cannot reach into the ground even under special operating conditions such as when the automatic lawn mower is tilted. Of course, the ground clearance of the lower end 417 of the movable protective wall can also be set to other ranges, such as 15mm-25mm, etc.

[0099] In another embodiment, the initial distance between the lower end 417 of the movable protective wall and the ground is always less than 19 mm, that is, it is always less than the radius of a child's arm, making it difficult for a child's fingers to extend into the cutting mechanism 3 from under the lower end 417 of the movable protective wall.

[0100] Specifically, a safety distance value can be preset, and the safety distance value is less than or equal to M. For example, the safety distance value is 40mm, 38mm, or 19mm, 15-35mm, or 19-30mm or 15-25mm, etc. Regardless of the cutting height of the cutting mechanism 3, or in other words, the cutting mechanism 3 is at any cutting height, the movable protective member 41 is in a free state, and the initial distance H0 of the lower end 417 of the movable protective wall from the ground is always less than the safety distance value. In this embodiment, when the cutting height of the cutting mechanism 3 is adjusted, the cutting mechanism 3 can move relative to the movable protective member 41, so that the initial distance H0 of the lower end 417 of the movable protective wall from the ground is always less than the safety distance value when the movable protective member 41 is in a free state.

[0101] like Figure 4 As shown, when the movable protective element 41 is in its lowest state 411, the distance H1 between the lower end 417 of the movable protective wall and the ground is less than M, so as to prevent the child's arm from extending from the bottom of the movable protective element 41 into the interior of the cutting mechanism 3 and causing accidental injury by the cutting mechanism 3. Figure 4 As shown, when the movable guard 41 is in a free state, that is, when the automatic lawn mower 1 is not subject to external forces, the movable guard 41 is in its lowest position 411. Regardless of the cutting height of the cutting mechanism 3, the movable guard 41 is always in its lowest position 411 when in the free state. That is, when the movable guard 41 is in the free state, the distance H0 between the lower end 417 of the movable guard wall and the ground is the same as the distance H1 between the lower end 417 of the movable guard wall and the ground when the movable guard 41 is in its lowest position 411. For example, when the automatic lawn mower 1 is stationary, moving on grass without resistance, or passing over an obstacle 62 with a height less than or equal to H1, the movable guard 41 is in its lowest position 411. In the lowest position 411, the distance H1 between the lower end 417 of the movable protective wall and the ground is less than M. When an arm with a diameter greater than or equal to M attempts to extend from under the movable protective element 41 into the automatic lawn mower 1, it is blocked by the movable protective wall 414 and cannot extend into the movable protective element 41. In one embodiment, the distance H1 between the lower end 417 of the movable protective wall and the ground is within a range of 15 to 25 mm. This distance between the lower end 417 of the movable protective wall and the ground prevents children from extending their arms while also preventing the movable protective wall 414 from being too close to the ground and hindering their normal walking on the grass. In another embodiment, the distance between the lower end 417 of the movable protective wall and the ground is always less than 19 mm, preventing children's fingers from extending from under the lower end 417 of the movable protective wall into the cutting mechanism 3.

[0102] The movable guard 41 can move upwards by an external force for a distance of not less than 15 mm in the vertical direction. Specifically, the movable distance range can be 15 to 80 mm, so that the movable guard 41 can avoid most obstacles 62. After the lower end of the movable guard wall moves upward, the distance between it and the ground can be greater than M to avoid limiting the passability of the child's arm in order to block it. In one embodiment, Figures 4 to 6 As shown, the automatic lawn mower 1 includes an upward guiding mechanism connecting the housing 10 and the movable guard 41, such as a parallelogram linkage structure. When the movable guard 41 is subjected to an outward-inward force, the upward guiding mechanism guides it to allow the movable guard 41 to move in the up and down directions. This upward guiding mechanism connecting the movable guard 41 can also be referred to as a guard upward guiding mechanism 45. When the cutting mechanism 3 is at any cutting height, the movable guard 41 can move upward relative to the bottom housing 101 under the action of an external force, thereby increasing the distance of the movable guard wall from the ground. When the external force is eliminated, the movable guard 41 can move downward relative to the bottom housing 101, returning the ground distance of the lower end of the movable guard wall to its initial distance. Specifically, the movable guard 41 can be automatically returned to its free state position by gravity, or by adding a return mechanism, such as a spring, to return it to its free state position. Because the upward guide mechanism 45 of the protective element can drive the movable protective element 41 to move in the vertical direction and in the horizontal direction during its rotation, if the horizontal displacement is too large, it may interfere with the housing 10 or other horizontal components, which may reduce the horizontal movement of the movable protective element 41. In this embodiment, the vertical movable distance of the movable protective element 41 is limited to 20 to 40 mm, so that the upward guide mechanism 45 of the protective element rotates as close to the horizontal direction as possible to reduce its horizontal movement range. In other embodiments, the movable protective element 41 can also be connected to the housing 10 through other structures to achieve its vertical movement, such as through a four-bar linkage, a two-bar linkage, a single bar, and a slide.

[0103] In the horizontal direction, the minimum distance X between the outermost edge of the movable protective wall 414 and the portion of the cutting mechanism 3 closest to it is greater than 58 mm. Generally, the minimum distance X between the outermost edge of the movable protective wall 414 and the portion of the cutting mechanism 3 closest to it is the minimum distance between the outermost edge of the movable protective wall 414 and the cutting element 30 during the rotation of the cutting element 30 by the cutter head. In this embodiment, this minimum distance X is between 58 and 200 mm. Because fingers are relatively small in diameter, they can still reach through the bottom of the movable protective member 41 and touch the cutting mechanism 3. In this embodiment, by setting the minimum distance X between the outermost edge of the movable protective wall 414 and the portion of the cutting mechanism 3 closest to it to 58 mm, and because most children's fingers are within the 58 mm range, this embodiment effectively prevents most children's fingers from reaching through the bottom of the movable protective member 41 into the interior of the cutting mechanism 3 and causing accidental injury from the cutting mechanism 3. In one embodiment, the minimum distance X between the outermost edge of the movable protective wall 414 and the portion of the cutting mechanism 3 closest to it is 63 to 75 mm. This ensures that children's fingers cannot touch the cutting mechanism 3 while limiting the horizontal distance between the movable protective member 41 and the cutting mechanism 3, thereby improving the compactness of the overall structure of the automatic lawn mower 1 and achieving miniaturization and lightweighting of the automatic lawn mower 1. The outermost edge 413 of the movable protective wall refers to the outermost portion of the movable protective wall 414 that can be touched by the user's arm or finger. Figure 1 As shown, the outermost edges 413 of the movable protective walls include a front outermost edge 4131 located at the front edge of the front movable protective wall 4141, a side outermost edge 4132 located at the outer edge of the side movable protective wall 4142, and a rear outermost edge 4133 located at the rear edge of the rear movable protective wall 4143. The outermost edges 413 of the movable protective walls can be flat, curved, or irregular.

[0104] like Figure 1 、 Figure 4 、 Figure 6 and Figure 23 As shown, the outermost edge of the movable protective wall 414, that is, the outermost edge 413 of the movable protective wall includes an obstacle passing area 4135, and the obstacle passing area 4135 includes an inclined surface extending downward from the outside to the inside. The obstacle passing area 4135 is high on the outside and low on the inside. When an obstacle 62 collides with the outermost edge 413 of the movable protective wall from the outside to the inside, the obstacle 62 generates a force perpendicular to the outermost edge 4131 of the movable protective member 41, that is, it generates an inclined upward force. The inclined upward force generates an upward component force, thereby causing the movable protective member 41 to move upward to quickly pass through the obstacle 62.

[0105] The outermost edge 4131 of the front end of the movable protective wall 414 includes the above-mentioned obstacle passing area 4135. The obstacle passing area 4135 includes an inclined surface extending downward from the outside to the inside (from the front to the back). In the direction of the automatic lawn mower's advance, the inclined outermost edge 4131 of the front end is higher at the front and lower at the back. When the automatic lawn mower 1 encounters an obstacle 62 while traveling automatically, the movable protective member 41 collides with the obstacle 62. The obstacle 62 generates a force perpendicular to the outermost edge 4131 of the front end of the movable protective member 41, that is, generates an inclined upward force. The inclined upward force generates an upward component force, thereby causing the movable protective member 41 to move as shown in FIG. Figure 5 As shown, the robot moves upward to avoid the obstacle 62, thereby improving the passability of the robot lawn mower 1 while preventing children's fingers or arms from touching the cutting mechanism 3. The outermost edge 4131 of the front end can be an inclined plane or a curved surface.

[0106] like Figure 12 As shown, in one embodiment, the rear outermost edge 4133 of the movable protective wall 414 extends obliquely downward from the outside to the inside (from the back to the front). When the automatic lawn mower 1 is moving forward, the oblique rear outermost edge 4133 is lower in front and higher in the back. When the automatic lawn mower 1 is moving backward and collides with an obstacle 62, the obstacle 62 generates a force perpendicular to the rear outermost edge 4133 of the movable protective member 41, generating an oblique upward force. This upward force generates an upward component, which in turn moves the movable protective member 41 upward to avoid the obstacle 62. This prevents children's fingers or arms from contacting the cutting mechanism 3 while improving the maneuverability of the automatic lawn mower 1 during backward movement. The rear outermost edge 4133 can be an inclined flat surface or a curved surface. Similarly, the side outermost edges 4132 of the movable protective wall 414 can also be configured to extend obliquely outward and upward, allowing the automatic lawn mower 1 to quickly pass obstacles when turning to the sides, improving its maneuverability during turning.

[0107] like Figure 13 As shown, the rear movable protective wall 4143 of the movable protective wall 414 is assembled on the movable connecting wall 415. The automatic lawn mower 1 includes a limiting structure 418 and a reset structure 416. In this embodiment, the reset structure 416 is an elastic member used to connect the movable connecting wall 415 and the rear movable protective wall 4143, such as a torsion spring, and the limiting structure 418 is a limiting portion 4181. In other embodiments, the limiting structure 418 and the reset structure 416 can be of other forms. When the automatic lawn mower 1 moves normally, the rear movable protective wall 4143 is subjected to the elastic force of the elastic member and the action of the limiting portion 4181, so that it is maintained in a Figure 13 As shown in the position. Figure 13As shown, when the automatic lawn mower 1 moves backward and the rear outermost edge 4133 of the rear movable protective wall 4143 collides with the obstacle 62, the movable protective wall 4143 is subjected to an upward force and moves upward to the position shown in FIG. Figure 14 In the position shown, the upper part of the rear movable protective wall 4143 collides with the housing 10, and the rear movable protective wall 4143 is subjected to a downward force, and then rotates clockwise downward, as shown in FIG. Figure 15 As shown, the obstacle 62 is pushed forward, and the vehicle quickly passes through the obstacle 62 to continue moving backward. After the rear movable protective wall 4143 rotates clockwise for a certain distance, it is acted upon by the reverse force of the reset structure 416, for example, by the restoring force of the torsion spring, and the rear movable protective wall 4143 returns counterclockwise as shown. Figure 13 In this embodiment, the rear movable protective wall 4143 is designed to be flippable and assembled on the movable connecting wall 415. The rear movable protective wall 4143 flips downward to avoid the obstacle 62, while reducing the upward movable distance of the rear movable protective wall 4143. More space is reserved above the rear movable protective wall 4143 for the housing 10, making the overall structure of the automatic lawn mower 1 more compact.

[0108] like Figure 23 The figure shows that in one embodiment, a static analysis of a connecting rod is performed and the following results are obtained:

[0109] F*L1*sin(a+b)=G*L1*cos(a)

[0110] So: F=G*cos(a) / sin(a+b)

[0111] Wherein: F is the horizontal thrust of the child's arm, L1 is the length of the connecting rod, L2 is the distance that the protective part is allowed to float, G is the gravity of the protective part, and b is the inward inclination angle from the vertical plane where its outermost end is located. In this embodiment, the movable protective part 41 is 30 mm from the ground and is allowed to move upward by 20 mm, that is, the lower end 417 of the movable protective part is between 30 and 50 mm from the ground. In this example, the length of the four-link is selected as 110 mm. When the movable protective part 41 is in the highest state 412, the four-link motion maintains a horizontal state. In this embodiment, when F is the test force of the child's arm 5N, G=0.93N. That is, the weight of the movable protective part is greater than 93g, and the test force of the child's arm cannot lift the protective part.

[0112] Through the above calculations, it can be found that the smaller b is, that is, the closer the area where the outermost edge 413 of the movable protective part contacts the test arm 61 is to vertical, the longer the four-link is, the heavier the movable protective part 41 is, the smaller the distance that the lower end 417 of the movable protective wall moves upward, and the more difficult it is to lift the movable protective part 41.

[0113] In this embodiment, Figure 23 As shown, the outermost edge 413 of the movable protective wall also includes a safety locking area 4136 for preventing the child's arm from lifting the movable protective wall 414. A safety external force value F1 is preset, and the safety external force value is not less than the test force 5N of the child's arm. When the force from the outside to the inside acts on the safety locking area, the movable protective wall 414 cannot move upward. The safety locking area 4136 is set in the area where the outermost edge 413 of the movable protective part contacts the test arm 61 to prevent the lower end 417 of the movable protective part from moving upward under the action of the child's arm test force. The lower end of the safety locking area is less than M from the ground. Even if the movable protective part is forced to move upward, because the lower end of the safety locking area is less than M from the ground, at the highest position where the child's arm can lift the movable protective part, there must be a section of the safety locking area that is against the child's arm to ensure that the child's arm cannot extend into the cutting mechanism. Since the area where the outermost edge 413 of the movable protective part contacts the test arm 61 is generally within the range of M (including M) between the movable protective wall 414 and the ground, a safety locking area 4136 is set at least within the range of M between the movable protective wall 414 and the ground. Of course, depending on the situation, the above-mentioned safety locking area 41 may also be set where the distance between the movable protective wall 414 and the ground exceeds M to prevent the child's arm from tilting and contacting the above-mentioned movable protective wall 414.

[0114] like Figure 23As shown, safety lock zone 4136 is located outside of the downward extension of the obstacle passage zone on the same radial direction. Safety lock zone 4136 includes an inclined surface and / or a vertical surface. Specifically, safety lock zone 4136 includes an inclined surface and / or a vertical surface extending downward from the outside to the inside and / or an inclined surface extending upward from the outside to the inside. These inclined surfaces and vertical surfaces may be flat, curved, irregular, or the like. When safety lock zone 4136 is an inclined surface extending downward from the outside to the inside, the angle of inclination of the inclined surface of safety lock zone 4136 from the vertical plane at its outermost end may be less than 15 degrees. In one embodiment, the angle of inclination of the inclined surface of safety lock zone 4136 from the vertical plane at its outermost end may be less than 3 degrees. When the safety locking zone 4136 is an inclined surface that tilts downward from the outside to the inside, the angle at which the inclined surface of the safety locking zone 4136 tilts inward from the vertical plane where its outermost end is located is smaller than the angle at which the inclined surface of the obstacle passing zone 4135 tilts inward from the vertical plane where its outermost end is located. The smaller the angle at which the inclined surface of the safety locking zone 4136 tilts inward from the vertical plane where its outermost end is located, the less likely the movable protective wall will move upward when a preset safety external force value acts on the safety locking zone 4136. In one embodiment, the safety locking zone 4136 can be selected as a vertical surface, and only the demolding angle is retained. The greater the angle at which the inclined surface of the obstacle passing zone 4135 tilts inward from the vertical plane where its outermost end is located, the easier it is for the movable protective wall 414 to be lifted when the obstacle 62 hits the movable protective wall 414, and thus the easier it is to avoid obstacles. In one embodiment, as Figure 32 As shown, in the up and down directions of the automatic lawn mower 1, the movable protective wall 414 includes a main movable part 401 located at its upper end and a locking part 402 formed by the autonomous movable part 401 extending downward. The outermost edge of the main movable part 401 is provided with an obstacle passing area 4135, and the outermost edge of the locking part 402 is provided with a safety locking area 4136. In this embodiment, the movable protective wall having both the obstacle passing area 4135 and the safety locking area 4136 is taken as an example. In other embodiments, the movable protective wall may also have only one of the obstacle passing area 4135 and the safety locking area 4136. In order to achieve better passability, the distance from the lower end of the locking part 402 to the ground is preferably in the range of M / 2 to M, where M is between 38mm-40mm. For example, when the distance from the locking part 402 to the ground is 19mm-40mm, at this time, the distance from the lower end of the locking part 402 to the ground is greater than the radius of the test arm 61. If Figure 32 As shown, when the outermost edge of the locking portion 402 is a continuous surface or a section of a long continuous surface, when the test arm 61 strikes the locking portion 402 in a non-linear direction, Figure 32 When the lower end of the movable protective wall 414 is Figure 33 and Figure 34As shown, the transition surface between the front end surface of the test arm 61 and its side surface abuts against the lower end of the continuous surface of the outermost edge of the locking portion 402. At this time, the force-bearing surface is the transition surface, and as shown in FIG. Figure 34 As shown, the force point on the test arm 61 is located above the horizontal plane where the center line of the test arm is located, and the test wall 61 and the movable protective wall 414 are in contact with each other to produce the following Figure 34 The force F shown can be decomposed into a vertical component F1 and a horizontal component F2. The vertical component F1 will push the floating protective wall upward, causing the movable protective wall to increase its distance from the ground. When the distance is greater than the diameter of the test arm 61, the test arm 61 can extend into the interior of the movable protective wall 414, and then extend into the cutting mechanism and be accidentally injured.

[0115] In order to avoid the risk of the test arm 61 hitting the movable protective wall 414 along the non-linear direction, in one embodiment, Figure 35 As shown, the locking portion 402 at the lower end of the movable protective wall 41 includes a plurality of blocking protrusions 4021 circumferentially spaced apart at the bottom of the movable protective wall 414 and a transition wall 4022 for connecting the main movable portion 401 and the blocking protrusion 4021, wherein the outermost edges of the blocking protrusion 4021 and the transition portion 4022 are provided with a safety locking area 4136 to prevent the movable protective wall from being lifted when a child's arm is extended from the locking portion 402. In some embodiments, if the highest point of the blocking protrusion 4021 is sufficiently far from the ground, the transition portion may not be provided. For example, since the diameter of a general child's arm does not exceed M, when the highest point of the blocking protrusion 4021 is not less than M from the ground, the transition portion may not be provided, that is, the blocking protrusion 4021 is directly extended downward from the bottom of the main movable portion 401. As shown in FIG. Figure 35 As shown, the transition portion 4022 connected to the top of the blocking protrusion 4021 can be called the upper blocking portion. When there is no transition portion 4022 above the blocking protrusion 4021 and the main movable portion 401 is directly connected to the top of the blocking protrusion 4021, the main movable portion 401 can also be called the upper blocking portion.

[0116] like Figures 35 to 45 As shown, when the distance between the lower end of the locking portion 402 and the ground is within the range of M / 2 to M, that is, when the distance between the lower end of the blocking protrusion 4021 and the ground is greater than M / 2, for example, when the distance between the blocking protrusion 4021 and the ground is 19-40 mm, or when the distance between the lower end of the locking portion 402 and the ground is greater than the radius of the test arm 61, when the test arm 61 strikes the test arm 61 in the non-normal direction, Figure 35 When the lower end of the movable protective wall 414 is shown, the front end surface of the test arm 61 abuts against the blocking protrusion 4021, and the force applied thereto is as follows: Figure 36 and Figure 37 As shown, the force-bearing surface is always the front end surface of the test arm 61, which only produces Figure 37The force F' on the horizontal plane shown will not generate an upward force, which can prevent the movable protective wall 414 from moving upward when it is subjected to the force applied by the test arm 61 along a non-normal line direction, resulting in the test arm 61 extending into the cutting mechanism and causing danger.

[0117] In order to ensure that when the test arm 61 impacts the lower end of the movable protective wall 414 along any normal line direction, the force-bearing surface is the front end surface of the test arm 61, thereby avoiding the generation of an upward component force, the distance S between any two adjacent blocking protrusions 4021 and the height h of the blocking protrusion 4021 must be greater than zero. However, to prevent the test arm 61 from extending into the gap between two adjacent blocking protrusions 4021 along the normal line direction, therefore, the distance S ≤ the diameter of the test arm. Since the diameter of the test arm is less than or equal to 40 mm, in this embodiment, the range of S is limited to: 0 < S ≤ 40 mm; preferably, the range of S is: 3 ≤ S ≤ 25 mm, to avoid a too small gap between two adjacent blocking protrusions 4021, resulting in an upward force generated by the test arm invading along a non-normal line direction, or a too large gap, allowing the test arm 61 to extend into the gap. At the same time, if the blocking protrusion 4021 is too large, it will lead to poor passability. Therefore, the height h of the blocking protrusion 4021 is limited to 0 < h ≤ 80 mm, preferably 3 ≤ h ≤ 20 mm.

[0118] At the same time, to prevent the transition surface of the test arm 61 from abutting against the outermost edge of the blocking protrusion 4021 when the test arm 61 impacts in a non-normal line direction, the width M of the blocking protrusion 4021 is limited to 0 < M ≤ 40 mm, preferably 0 < M ≤ 20 mm. The outermost edge of the blocking protrusion 4021 does not overlap with the outermost edge of the upper blocking portion, that is, the outermost edge of the blocking protrusion 4021 does not overlap with the outermost edge of the transition portion 4022. The part of the blocking protrusion 4021 that does not overlap with the outermost edge of the upper blocking portion is located inside the corresponding part of the outermost edge of the upper blocking portion, that is, as Figure 35 shown, the part of the outermost edge of the blocking protrusion 4021 that does not overlap with the outermost edge of the transition portion 4022 is located inside the corresponding part of the outermost edge of the transition portion 4022. For example, when the outermost edges of the upper blocking portion, that is, the transition portion 4022 and the blocking protrusion 4021 are both curved surfaces, the curvature of the blocking protrusion 4021 is greater than that of the upper blocking portion at its corresponding position, that is, greater than the curvature of the transition portion 4022 at its corresponding position. The radius of curvature R of the blocking protrusion 4021 can be set to 0 < R ≤ 20 mm, preferably 0 < R ≤ 10 mm. In this embodiment, the outermost edge of the blocking protrusion 4021 is a semi-circular arc surface. In other embodiments, the outermost edge of the blocking protrusion 4021 can also be other arc surfaces, or a straight surface with a relatively small width, etc.

[0119] In this embodiment, the ground clearance of the lower end of the locking portion 402, that is, the lower end of the blocking protrusion 4021, is set to be within the range of M / 2 to M, for example, the ground clearance of the lower end of the locking portion 402 is 19mm-40mm, thereby enhancing the passability of the automatic lawn mower. At the same time, the blocking protrusion 4021 is provided to prevent children's arms from entering the movable protective wall in a non-illegal direction, thereby ensuring the safety of children while improving the passability.

[0120] In another embodiment, the distance from the lower end of the locking portion 402 to the ground can be limited to within the radius of the child's arm to avoid the upward force generated when the child's arm collides with the locking portion 402 in an illegal direction. Specifically, when the cutting mechanism is at any cutting height, the initial distance of the movable protective wall 41 from the ground is always less than or equal to M / 2, which means that the initial distance from the lower end of the locking portion 402 to the ground can be limited to less than or equal to M / 2. For example, the distance from the lower end of the locking portion 402 to the ground is less than or equal to 19 mm. At this time, if Figure 38 As shown, when the test arm 61 strikes along the non-linear direction Figure 32 When the lower end of the movable protective wall 414 is shown, Figure 39 As shown, the force point on the test arm 61 is always on the horizontal plane where the center line of the test wall 61 is located. At this time, only the force F'' on the horizontal plane is generated, and no upward component force is generated. Therefore, at this time, the child's arm can be prevented from extending into the movable protective wall 414 along the illegal direction.

[0121] With Figure 35 When the automatic lawn mower with the locking portion 402 shown encounters dense grass, the blocking protrusion 4021 will be inserted into the grass. Because the grass is overlapped, as the automatic lawn mower moves forward, the blocking protrusion 4021 will pull the grass apart. In addition, the overlapping grass will bring resistance to the forward movement of the automatic lawn mower, reducing the passability of the automatic lawn mower.

[0122] In order to further improve the passability of dense grass, in one embodiment, Figure 40 As shown, the locking portion 402 at the lower end of the movable protective wall 41 further includes a connecting protrusion 4023 extending in the vertical direction for connecting at least two adjacent blocking protrusions 4021. The connecting protrusion 4023 is partially recessed inward so that the connecting protrusion 4023 and the two adjacent blocking protrusions 4021 connected thereto form a structure with an outer space and an inner closed structure. Figures 41 to 43 As shown, when the automatic lawn mower encounters grass while moving forward, the blocking protrusion 4021 is inserted into the grass, but as the automatic lawn mower moves forward, as shown in FIG. Figure 42 As shown, the grass is pressed down by the connecting protrusion 4023, and as the automatic lawn mower moves further forward, as shown in FIG. Figure 43As shown, the crushed grass stands up again, enters the cutting area, and is then cut by the cutting mechanism. In this embodiment, by providing the connecting protrusion 4023, it effectively prevents the blocking protrusion from inserting into the thick grass, resulting in an increase in operating resistance, or even breaking or pulling the grass. The circumferentially continuous structure formed by the above-mentioned connecting protrusion and the blocking protrusion can also be referred to as the grass pressing end face 406. In other embodiments, a circumferentially continuously extending grass pressing end face 406 can also be directly provided at the lower end of the movable protective wall or the lower end of the mechanism protective wall. As long as the lower end of the movable protective wall has no through-opening in the inner and outer directions, it can be in the shape of Figure 40 as shown in serrations, or can be Figure 45 the structure shown, or can be Figure 32 the structure shown. The grass pressing end face 406 directly presses down the grass, thereby avoiding excessive operating resistance and even breaking or pulling the grass.

[0123] As Figure 44 shown, in order to achieve better passability while ensuring safety protection, in the direction from outside to inside, the distance d between the outermost side of the blocking protrusion 4021 and the innermost side of the connecting protrusion 4023, the height h of the blocking protrusion 4021, the distance S between two adjacent blocking protrusions 4021, and the width M of the blocking protrusion 4021 should not be too large or too small; if d is too large, or h is too large, or S is too large, the more grass is stuffed into the gap between the two blocking protrusions or the longer the movement distance of the grass in the gap, the greater the operating resistance and the easier it is to pull the grass; if d is too small, or h is too small, or S is too small, or M is too large, it is easier for the child's arm to reach into the movable protective wall 414, bringing safety risks; M cannot be too small either, as M is too small, the strength of the blocking protrusion 4021 will also decrease. For these reasons, in this embodiment, it is set that 1mm ≤ d ≤ 100mm, preferably 3mm ≤ d ≤ 20mm; 0mm < h ≤ 80mm, preferably 3mm ≤ h ≤ 20mm; 0 < S ≤ 40mm, preferably 3 ≤ S ≤ 25mm; 0 < m ≤ 40mm, preferably 0 < m ≤ 20mm, so as to improve the passability of the automatic lawn mower while ensuring that the child's arm cannot reach into the movable protective wall.

[0124] As Figure 40 shown, in this embodiment, the connecting protrusion 4023 is a V-shaped structure connecting two adjacent blocking protrusions 4021, and the connecting protrusion 4023 and the blocking protrusion 4021 are connected into a zigzag shape. Such a design can ensure the distance S between two adjacent blocking protrusions 4021, the distance d between the outermost side of the blocking protrusion 4021 and the innermost side of the connecting protrusion 4023, the height h of the blocking protrusion 4021, and the width M of the blocking protrusion 4021, while尽可能地减小连接凸起4023与阻挡凸起4021围成的、朝向自动割草机外侧的凹槽的体积,减小草塞入该凹槽的量,减小运行阻力,降低草被拉伤的风险。

[0125] Of course, in other embodiments, the connecting protrusion 4023 may also be a V-shaped arc structure according to the situation, and the connecting protrusion 4023 and the blocking protrusion 4021 may be connected in a wave shape, or as shown in FIG. Figure 45 As shown, the connecting protrusion 4023 may also be an N-shaped structure, and the connecting protrusion 4023 and the blocking protrusion 4021 may be connected to form a continuous N-shaped structure, and so on. In this embodiment, in order to prevent a child's arm from being cut by the cutting element 32 when the automatic lawn mower 1 accidentally runs over it, it is necessary to ensure that during the movable protective member 41 is movable, that is, during the process of the lower end 417 of the movable protective wall moving in the up and down directions, the lower end of the protective assembly 4 is always lower than the cutting element 30. To achieve the above purpose, the lower end of the protective assembly 4 can be ensured to be always lower than the lowest point 30 of the cutting element by adding the above-mentioned mechanism protective member 42. It can also be achieved by limiting the relative position relationship between the movable protective member 41 and the cutting mechanism 3 during the movement of the movable protective member 41, so that when the movable protective member 41 is subjected to external force, the lower end 417 of the movable protective wall is always lower than the lowest point 30 of the cutting element during the process of moving the movable protective member 41 in the up and down directions.

[0126] For example, in the case of a movable guard 41, the lower end of the guard assembly 4 can be ensured to be always below the lowest point 30 of the cutting element by adding the aforementioned mechanical guard 42. The guard assembly 4 includes a movable guard 41 and a mechanical guard 42, wherein the mechanical guard 42 is fixed relative to the cutting mechanism 3. For example, when the cutting mechanism 3 moves relative to the housing, the mechanical guard 42 moves with it. When the cutting mechanism 3 is stationary relative to the housing, the mechanical guard 42 also moves with it. In the non-height adjustment state, the cutting mechanism 3 can be configured to be movable relative to the housing, or it can be configured to be immovable relative to the housing. No matter how the cutting mechanism 2 and the movable protective member 41 move, or how they move relative to each other, since the mechanism protective member 42 is always fixed relative to the cutting mechanism 2, and the lower end of the mechanism protective member 42 is always lower than the lowest point 30 of the cutting element, even if the test arm 61 passes over the movable protective member 41, it will be blocked by the mechanism protective member 42; even if the lower end of the mechanism protective member 42 is higher than the test arm 61, the test arm 61 can only be located below the cutting element 30 and cannot touch the cutting element 30. Therefore, the safety of the child's arm can be guaranteed. In this embodiment, any of the aforementioned or subsequent embodiments with the mechanism protective member 42 can be directly cited, and in this embodiment, the structure will not be described in detail. In the following, in the case of a movable protective member 41, the lower end of the protective component 4 is always lower than the cutting element 30 by limiting the relative position relationship between the movable protective member 41 and the cutting mechanism 3 during the movement of the movable protective member 41 as an example.

[0127] For example, by limiting the movable guard 41 to be in the two extreme states of the lowest state 411 and the highest state 412, the lower end of the movable guard is always lower than the lowest point 30 of the cutting element, so as to achieve that the lower end of the movable guard 41 is always lower than the lowest point 30 of the cutting element during the entire movement process.

[0128] When the cutting height of the automatic lawn mower 2 is adjusted to the lowest position and the movable guard 41 is in the lowest position 411, the lower end 417 of the movable guard wall of the movable guard 41 is lower than the lowest point 30 of the cutting element in the vertical direction. This ensures that regardless of how the cutting height of the automatic lawn mower 2 is adjusted, when the movable guard 41 is in the lowest position, the lower end 417 of the movable guard wall of the movable guard 41 is always lower than the lowest point 30 of the cutting element, thereby preventing children's arms from being crushed by the automatic lawn mower 1. Specifically, the distance between the lower end 417 of the movable guard wall and the lowest point 30 of the cutting element is 2 to 30 mm to ensure that children's fingers and arms cannot touch the cutting mechanism 3 around the protective guard.

[0129] When the cutting mechanism is at any cutting height and the automatic lawn mower 1 is moving, when the movable guard 41 is in the highest position 412, that is, when the movable guard wall is moved upward by an external force to the highest point of its movable range, the lower end 417 of the movable guard wall is lower than the lowest point 30 of the cutting element. This ensures that when the movable guard 41 is subjected to an inward force from the outside, the lower end 417 of the movable guard wall of the movable guard 41 is always lower than the lowest point 30 of the cutting element. To achieve the above purpose, the following technical solution can be adopted.

[0130] In one embodiment, at at least one cutting height, during the movement of the automatic lawn mower 1, when the movable guard 41 is moved vertically by an external force, the cutting mechanism 3 moves synchronously with the movable guard 41 in the vertical direction, ensuring that the lower end 417 of the movable guard wall remains below the lowest point 30 of the cutting element. The movable guard 41 is interconnected with the cutting mechanism 3. During the movement of the automatic lawn mower 1, when the movable guard 41 is forced to move upward, the cutting mechanism 3 moves upward with it. When the movable guard 41 moves downward, the cutting mechanism 3 also moves downward with it. In this embodiment, the interconnection between the cutting mechanism 3 and the movable guard 41 ensures that the vertical movement of the movable guard 41 drives the cutting mechanism 3 to move synchronously with it. During the vertical movement of the cutting mechanism 3 following the movable guard 41, the cutting mechanism 3 can be fixed relative to the movable guard 41 or can undergo a certain relative movement. For example, in one embodiment, during the movement of the automatic lawn mower 1, the cutting mechanism 3 and the movable guard 41 are relatively fixed in the vertical direction, that is, their relative positions in the vertical direction do not change. Because the cutting mechanism 3 moves along with the movable guard 41, their relative positions in the vertical direction do not change. As long as the lower end 417 of the movable guard wall is lower than the lowest point 30 of the cutting element when the movable guard 41 is in its lowest position, the lower end 417 of the movable guard wall remains lower than the lowest point 30 of the cutting element throughout the entire movement of the movable guard 41. In another embodiment, in the up and down directions, the cutting mechanism 3 moves together with the movable protective member 41, and the cutting mechanism 3 can also move relative to the movable protective member 41. The automatic lawn mower 1 also includes a movable adjustment mechanism (not shown) for adjusting the movement of the cutting mechanism 3 relative to the movable protective member 41. For example, the movable adjustment mechanism is an adjustment mechanism that automatically adjusts the cutting mechanism 3 to move upward. For example, when the movable protective member 41 is moved upward by 20 mm by an external force, and the movable adjustment mechanism controls the cutting mechanism 3 to move upward by 10 mm compared to the movable protective member 41, then during the entire process, the movable protective member 41 moves upward by 20 mm compared to the shell 10, and the cutting mechanism 3 moves upward by 30 mm compared to the shell 10.

[0131] In the process of adjusting the height of the cutting mechanism 3, the cutting mechanism 3 and the movable protective member 41 can move relative to each other in the up-down direction, so that the lower end 417 of the movable protective wall will not increase infinitely as the cutting mechanism 3 is raised, thereby ensuring that the distance H0 between the lower end 417 of the movable protective wall and the ground is always less than a preset safety distance value, for example, always less than 38 mm. In this embodiment, the cutting mechanism 3 and the movable protective member 41 can move relative to each other in the up-down direction in the process of adjusting the height of the cutting mechanism 3, the cutting mechanism 3 moves in the up-down direction relative to the ground, and the movable protective member 41 remains stationary in the up-down direction relative to the ground. Of course, in other embodiments, the cutting mechanism 3 and the movable protective member 41 can both move in the up-down direction, but they can move asynchronously when the height is adjusted, for example, the distance moved by the movable protective member 41 is less than the distance moved by the cutting mechanism 3, etc.

[0132] In another embodiment, at at least one cutting height, when the movable protective wall 414 is moved in the vertical direction by an external force, the lower end of the movable protective wall 414 can move in the vertical direction relative to the cutting mechanism 3. Figure 11As shown, the automatic lawn mower 1 includes a limiting mechanism 9 for limiting the relative position of the movable guard 4 and the cutting mechanism 3. The limiting mechanism 9 is used to limit the relative movement of the movable guard 4 and the cutting mechanism 3 in the vertical direction. The limiting mechanism 9 includes a cutting limiting portion 39 and a guard limiting portion 419 that can abut against each other to limit position. The cutting limiting portion 39 is relatively fixed to the cutting mechanism 3 in the vertical direction, and the guard limiting portion 419 is relatively fixed to the movable guard 41 in the vertical direction. When the cutting limiting portion 39 and the movable guard 41 abut against each other, the cutting limiting portion 39 is located above the guard limiting portion 419. Specifically, the limiting mechanism 9 includes a guard limiting portion 419 provided on the movable guard 4 and a cutting limiting portion 39 provided on the cutting mechanism 3. The cutting limit portion 39 is located above the guard member limit portion 419. When the movable guard wall 414 moves upward due to external force, the movable guard wall 414 can move in the up and down directions compared to the cutting mechanism 3. When the movable guard wall 414 moves upward, the guard member limit portion 419 follows the upward movement. When the guard member limit portion 419 moves to abut against the cutting limit portion 39, it is blocked by the cutting limit portion 39. The upward movement of the movable guard 4 is restricted by the cutting mechanism 3. The movable guard 4 can no longer continue to move upward compared to the cutting mechanism 3, thereby limiting the range of the movable guard 4 to move upward compared to the cutting mechanism 3, so that when the movable guard 4 moves upward, the lower end 417 of the movable guard wall is always lower than the lowest point 30 of the cutting element. When the movable guard 4 is in its lowest position and the cutting mechanism 3 is adjusted to its lowest cutting height, the vertical distance between the lower end 417 of the movable guard wall and the lowest point 3 of the cutting element is greater than the distance between the guard stop portion 419 and the cutting stop portion 39. This ensures that when the movable guard 4 moves to its highest position, the lower end 417 of the movable guard wall remains below the lowest point 3 of the cutting element, and remains below the lowest point 3 of the cutting element throughout the entire movable process. When the cutting mechanism 3 is adjusted upward, the distance between the guard portion 419 and the mechanism guard portion 39 increases synchronously with the upward adjustment of the cutting mechanism 3. Therefore, regardless of how much the cutting mechanism 3 is raised, the lower end 417 of the movable guard wall remains below the lowest point 30 of the cutting element in the vertical direction. In other embodiments, other methods can be used to ensure that the lower end 417 of the movable protective wall remains below the lowest point 3 of the cutting element during the movable guard member 4's movement. Examples of these methods are omitted in this disclosure. In this embodiment, the aforementioned preset grass safety lift height can also be employed to prevent the movable protective wall 414 from being lifted to the grass safety lift height when the automatic lawn mower 1 is stationary on the grass, thereby preventing a child's arm from extending from under the movable protective wall 414 and into the cutting mechanism 3. The details of this embodiment are omitted in further detail.

[0133] In one implementation of this embodiment, the cutting mechanism 3 is stationary in the vertical direction relative to the ground. When the movable protective member 4 is restricted from moving upward by the cutting mechanism 3, the cutting mechanism 3 cannot move upward, and therefore, the movable protective member 4 cannot move upward either.

[0134] In another implementation of this embodiment, Figures 24 to 26 As shown, the cutting mechanism 3 can also move vertically relative to the ground, and the cutting mechanism 3 and the movable guard 41 can move vertically relatively independently. The automatic lawn mower 1 includes a guard upward guide mechanism 45 for connecting the movable guard 41 to the housing 10, and a cutting upward guide mechanism 35 for connecting the cutting mechanism 3 to the housing 10. The guard upward guide mechanism 45 is independent of the cutting upward guide mechanism 315, so that the cutting mechanism 3 and the movable guard 41 can move vertically relatively independently.

[0135] like Figures 24 to 25 As shown, in the non-height adjustment state, when the cutting mechanism is acted upon by an external force, the cutting mechanism can move in the up and down directions relative to the ground. At at least one cutting height, when the movable protective wall 414 is acted upon by an external force and moves in the up and down directions, the lower end of the movable protective wall 414 can move in the up and down directions relative to the cutting mechanism 3. This embodiment takes the example that the movable protective wall 414 can move in the up and down directions relative to the cutting mechanism at any cutting height. In other embodiments, the two can move relative to each other only in some gears. In this embodiment, the movable protective wall 414 first moves upward alone until it and the cutting mechanism 3 limit each other, and then as shown in FIG. Figures 25 to 26 As shown, the movable protective wall 414 moves upward together with the cutting mechanism 3. The resistance of the movable protective wall 414 moving upward alone is less than the resistance of the movable protective wall 414 and the cutting mechanism 3 moving upward together after being limited. Figures 24 to 25As shown, during the forward movement of the automatic lawn mower 1, the movable protective wall 414 is subjected to an upward lifting force exerted by the grass. This grass lifting force is greater than the resistance to the upward movement of the movable protective wall 414 alone, allowing the movable protective wall 414 to move upward. However, this grass lifting force is less than the resistance to the upward movement of the movable protective wall 414 and the cutting mechanism 3 after the movable protective wall 414 and the cutting mechanism 3 are restrained. Therefore, when the movable protective wall 414 moves upward to the point where it is restrained by the cutting mechanism 3, the grass lifting force exerted on the movable protective wall 414 by the grass cannot lift the movable protective wall 414 and the cutting mechanism 3 upward together. At this point, the movable protective wall 414 remains in this position to perform the cutting task. During cutting, the distance between the lower end 417 of the movable protective wall and the lowest point 30 of the cutting element is maintained within a certain range, preventing the lower end 417 of the movable protective wall from being too close to the ground and too far from the lowest point 30 of the cutting element, thereby preventing the grass pressed by the movable protective wall 417 from being cut. In this embodiment, by ensuring the distance between the lower end 417 of the movable protective wall and the lowest point 30 of the cutting element, on the one hand, the distance between the lower end 417 of the movable protective wall and the ground is increased, thereby reducing the possibility of grass being pressed. On the other hand, even if the lower end 417 of the movable protective wall presses the grass, thereby reducing the distance between it and the lowest point 30 of the cutting element, the pressed grass can still be cut, thereby greatly improving the cutting quality.

[0136] like Figure 25 As shown, when the automatic lawn mower 1 encounters an obstacle 62 during movement, the upward obstacle lifting force generated by the external force exerted by the obstacle 62 on the movable protective wall 414 is greater than the resistance of the movable protective wall 414 and the cutting mechanism 3 to move upward together. Therefore, when the movable protective wall 414 moves upward to the point where it is limited by the cutting mechanism 3, under the force of the obstacle 62, as shown in FIG. Figure 26 As shown, the movable protective wall 414 moves upward together with the cutting mechanism 3 to pass through the obstacle 62 .

[0137] In the above embodiment, when the movable protective wall 414 is subjected to an external force from bottom to top, the lower end of the movable protective wall 414 moves upward compared to the bottom shell. When the automatic lawn mower moves on the grass, the movable protective wall 414 is subjected to the buoyancy from bottom to top exerted on it by the grass, and the movable protective wall 414 can move upward, and the lower end of the movable protective wall 414 produces an upward displacement to reduce the movement resistance exerted on it by dense grass and improve the passability of dense grass. In the above embodiment, the movable protective wall 414 is in the form of a whole moving in the up and down direction compared to the bottom shell. In other embodiments, the movable protective wall 414 can also be as Figures 19 to 20 As shown, it is a compressible structure, so that when its lower end is subjected to a force from bottom to top, the lower end can move upward to improve the passability of dense grass. Of course, in other embodiments, the movable protective member can also be in other forms, which are not listed one by one.

[0138] In another implementation of this embodiment, Figures 27 to 29 As shown, the movable guard 41 includes an upper guard 43 and a lower guard 44. By allowing the lower guard 44 to move vertically relative to the upper guard 43, the distance between the lower end of the lower guard 43 and the ground can be changed, thereby enabling the lower end of the lower guard 43 to move vertically relative to the cutting mechanism 3. The upper guard 43 and the lower guard 44 respectively include an upper guard wall 434 and a lower guard wall 444. Together, the upper and lower guard walls 434 and 444 form a movable guard wall 414. The lower end of the lower guard wall 444 is the lower end 417 of the movable guard wall. The lowest state 411 of the movable guard 41 is when the lower guard 44 is at its lowest position within its vertically movable space, while the highest state 412 is when the lower guard 44 is at its highest position within its vertically movable space. The protective member limiting portion 419 on the movable protective member 41 is provided on the lower protective member 44 , and the cutting mechanism 3 is provided with a cutting limiting portion 39 for limiting the protective member limiting portion 419 .

[0139] When adjusting the cutting height of the cutting mechanism 3, the lower protective wall 444 and the cutting mechanism 3 can move relative to each other in the vertical direction, so that the lower end of the lower protective wall 444, that is, the lower end 417 of the movable protective wall, is always less than M from the ground. For example, the upper protective wall 434 and the cutting mechanism 3 can move relative to each other in the vertical direction, while the lower protective wall 444 and the upper protective wall 434 do not move relative to each other in the vertical direction, so that the lower protective wall 444 and the cutting mechanism 3 can move relative to each other in the vertical direction. When the movable protective member 41 is moved upward by an external force, the lower protective wall 444 moves upward relative to the ground, and it also moves upward relative to the upper protective wall 434, first moving until it is limited by the cutting mechanism 3, and then moving upward together with the upper protective wall 434 and the cutting mechanism 3.

[0140] The resistance to the upward movement of the lower protective wall 444 alone is smaller than the resistance to the upward movement of the lower protective wall 444, the upper protective wall 434 and the cutting mechanism 3 together after the lower protective member 44 and the cutting mechanism 3 are limited.

[0141] like Figure 28 and Figure 29 As shown, when the automatic lawn mower 1 encounters an obstacle 62 during movement, the upward obstacle lifting force generated by the external force exerted by the obstacle 62 on the lower protective wall 444 is greater than the resistance of the lower protective wall 444, the upper protective wall 434 and the cutting mechanism 3 moving upward together after being limited. Therefore, when the lower protective wall 444 moves upward to the point where it is limited by the upper protective wall 434 and the cutting mechanism 3, under the force of the obstacle 62, as shown in FIG. Figure 29As shown, the lower protective wall 444 moves upward together with the upper protective wall 434 and the cutting mechanism 3 to pass through the obstacle 62.

[0142] In this embodiment, the above-mentioned cutting mechanism 3 and the movable protective member 41 can be moved relatively independently in the up and down directions, and the cutting mechanism 3 and the movable protective member 41 are provided with a limiting mechanism 9 that limit each other, and the implementation method of pre-setting the grass safety lifting height can also be used. By pre-setting the grass safety lifting height, when the lower protective wall 444 is moved upward by external force, when the lower end of the lower protective wall 444 is at a distance greater than the preset grass safety lifting height from the ground, the resistance to the upward movement of the lower protective wall 444 is greater than the resistance to the upward movement of the lower protective wall 444 when the distance from the lower protective wall 444 to the ground is not greater than the preset grass safety lifting height. However, when the lower end of the lower protective wall 444 is at a distance from the ground greater than the preset grass safety lifting height and the lower protective wall 444 has not yet been limited by the cutting mechanism 3, the resistance to the upward movement of the lower protective wall 444 is greater than the resistance to the upward movement of the lower protective wall 444 when the distance from the lower protective wall 444 to the ground is not greater than the preset grass safety lifting height and the lower protective wall 444 has not yet been limited by the cutting mechanism 3; and is smaller than the resistance to the upward movement of the lower protective wall 444, the upper protective wall 434 and the cutting mechanism 3 after being limited.

[0143] In another embodiment, the movable guard 4 and the cutting mechanism 3 can also be automatically movable. The automatic lawn mower 1 further includes a detection module for detecting whether the movable guard 4 and the cutting mechanism 3 need to be movable, and a movable control module for controlling the automatic lawn mower 1 to automatically control the movable guard 4 and the cutting mechanism 3 to move according to the detection result of the detection module. The detection module can be a visual sensor, an ultrasonic sensor, an infrared sensor, etc., which detects whether there is an obstacle in front and the size of the obstacle through visual, ultrasonic, infrared and other means. When there is an obstacle that can be crossed in front, the movable control module controls the movable guard 4 and the cutting mechanism 3 to move automatically to avoid the obstacle, and adjusts the movement distance of the movable guard 4 and the cutting mechanism 3 according to the size of the obstacle. When adjusting the movement distance of the movable guard 4 and the cutting mechanism 3, the movable guard 4 can be controlled to move synchronously with the cutting mechanism 3 to move the same distance, or the movable guard 4 can be controlled to move asynchronously with the cutting mechanism 3 to move different distances; when there is no obstacle in front, the movable control module controls the movable guard 4 and the cutting mechanism 3 to return to the original state; when there is an obstacle in front, but the obstacle is too large, the movable control module controls the movable guard 4 and the cutting mechanism 3 not to move, and controls the automatic lawn mower 1 to stop or turn according to the actual situation to avoid collision with the obstacle.

[0144] In the above embodiment, the cutting mechanism 3 can be arranged near the central axis in the forward direction of the automatic lawn mower 1, or can be arranged on one side of the central axis to achieve cutting to the edge. The movable protective member 41 and / or the mechanism protective member 42 in the corresponding embodiment are also arranged on one side of the central axis in the forward direction of the automatic lawn mower 1 to achieve cutting to the edge while preventing children's fingers or arms from reaching into the cutting mechanism 3 and causing accidental injury. Figure 30 As shown, taking the movable protective member 41 and the cutting mechanism 3 as an example, which are arranged on one side of the central axis, in this embodiment, the lower end 417 of the movable protective wall can move relative to the ground, such as Figure 31 As shown, when the user lifts the automatic lawn mower 1, the user grasps both sides of the automatic lawn mower 1 and applies an upward push to the movable guard 41 with their fingers, causing the movable guard wall 414 to move upward. The user's hands are unable to lift the automatic lawn mower 1 by applying force to the movable guard 41, and can only lift the automatic lawn mower 1 by applying force to the outer guard wall 14 of the housing 10. At this time, although the user's hands cannot directly grasp the movable guard wall 417, the fingers can still reach under the movable guard 41 when grasping the outer guard wall 14. Therefore, the movable guard 41 also includes a lower movable guard wall 4149 disposed below the cutting element 1 to prevent the user's fingers from reaching from below the movable guard 41 near the cutting element 32.

[0145] Because the movable protective wall 417 is disposed between the outer protective wall 14 and the cutting mechanism 3, and the outer protective wall 14 is farther from the cutting element 32 than the movable protective wall 417, when a user's finger extends from the outer protective wall 14 into the cutting mechanism 3, the distance below the movable protective element 41 that the finger can touch is less than the length of the finger. Therefore, the width of the lower movable protective wall 4149 in the direction of finger insertion is less than the length of the finger. Furthermore, as the distance between the outer protective wall 14 and the movable protective wall 417 increases, the width of the lower movable protective wall 4149 in the direction of finger insertion, i.e., in the horizontal direction perpendicular to the forward direction of the automatic lawn mower 1, can be shortened, or even eliminated. This greatly improves the maneuverability of the automatic lawn mower 1 while ensuring the user's safety when lifting the automatic lawn mower 1.

[0146] like Figure 30 and 31 As shown, the movable protective wall includes a vertical protective wall extending in the vertical direction and a horizontal protective wall located below the vertical protective wall and extending in the horizontal direction. At least one side of the horizontal protective wall protrudes from the corresponding side of the vertical protective wall, so that when the movable protective wall is subjected to the buoyancy of the grass, its force-bearing surface is larger, and it can be subjected to a larger lifting force from the grass, thereby enhancing passability. Figure 30As shown, the inner side of the horizontal protective wall protrudes from the inner side of the vertical protective wall, or the outer side of the horizontal protective wall protrudes from the outer side of the vertical protective wall, or both the inner and outer sides of the horizontal protective wall protrude from the inner and outer sides of the vertical protective wall. Specifically, the width of the horizontal protective wall along the inner and outer directions is 5-50 mm.

[0147] The housing 10 further includes an outer protective wall 14 located outside the movable protective member 41. The lower end of the outer protective wall 14 is less than 75 mm from the ground to prevent an adult's arm from reaching into the cutting mechanism 3. In one embodiment, the lower end of the outer protective wall 14 is 35 to 55 mm from the ground. This not only prevents an adult's arm from reaching into the cutting mechanism 3, but also limits the angle at which a child's arm can tilt upward from below the outer protective wall 14 into the housing 10, thereby reducing the risk of a child's arm contacting the cutting mechanism 3.

[0148] The automatic operating system also includes a guide line, and the automatic lawn mower 1 also includes a guide line detection module (not shown). The guide line detection module includes at least one guide line detection sensor for detecting the positional relationship between the automatic lawn mower and the guide line. The positional relationship between the automatic lawn mower and the guide line includes, for example, whether the automatic lawn mower is located on one side of the guide line or the distance between the automatic lawn mower and the guide line. In this embodiment, the guide line includes a boundary line that defines the operating area of the automatic lawn mower. In other embodiments, the guide line may also be a wire arranged within the operating area, extending from the location of a docking station to guide the automatic lawn mower toward the docking station. Of course, the guide line may also be a physical boundary formed by a fence, or a physical boundary between lawn and non-lawn areas. Accordingly, the guide line detection sensor may be a camera, a capacitive sensor, or the like. In other embodiments, a guide line may not be present, and the operating area of the automatic lawn mower may be controlled directly using a capacitive sensor, GPS positioning, or the like.

[0149] A threshold is preset. When the energy in the energy module falls below the threshold, the control module 50 controls the automatic lawn mower 1 to move along the boundary line toward the docking station, allowing the automatic lawn mower 1 to return to the charging station to recharge the energy module. During the process of controlling the automatic lawn mower 1 to move along the boundary line toward the docking station, the control module 50 controls the automatic lawn mower 1 by changing the distance between itself and the boundary line, then controls the automatic lawn mower 1 to move at least a first preset distance in a direction parallel to the boundary line, and repeats the above steps to allow the control module 50 to control the automatic lawn mower 1 to return to the charging station. In other embodiments, the automatic lawn mower 1 may also return to the charging station by other means. In other embodiments, the automatic lawn mower 1 may also be controlled by a preset time or other parameters. When the specified time or other parameters are reached, the control module 50 controls the automatic lawn mower 1 to automatically return to the charging station to recharge.

[0150] The technical features of the above-mentioned embodiments can be combined arbitrarily. In order to make the description concise, not all possible combinations of the technical features in the above-mentioned embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0151] The above-described embodiments merely illustrate several implementations of the present invention, and while their descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent. It should be noted that a person skilled in the art would be able to make numerous variations and improvements without departing from the spirit of the present invention, all of which fall within the scope of protection of the present invention. Therefore, the scope of protection of the patent for this invention shall be determined by the appended claims.

Claims

1. An automatic lawn mower, comprising: A housing provided with a bottom shell; A moving module disposed below the housing for driving the automatic lawn mower to move; A cutting mechanism disposed in the housing to perform a cutting task at a predetermined cutting height, the cutting mechanism including a cutting element for cutting; A control module for autonomously controlling the moving module to drive the automatic lawn mower to move and autonomously controlling the cutting mechanism to perform the cutting task; characterized in that: The automatic lawn mower further includes a movable protective member provided with a movable protective wall. Horizontally, the movable protective wall is disposed outside the cutting mechanism. Under the action of an external force, the movable protective member can move relative to the bottom shell so that the ground clearance of the lower end of the movable protective wall can change. The movable protective wall includes a plurality of blocking protrusions spaced circumferentially at its bottom. The movable protective wall further includes a connecting protrusion extending in the vertical direction and for connecting two adjacent blocking protrusions. The connecting protrusion is partially recessed inward so that the connecting protrusion and the two adjacent blocking protrusions connected thereto jointly form a structure with an outer interval and an inner closure. When the movable protective member is in a free state without external force, the ground clearance of the lower end of the blocking protrusion is always less than M, and 38 mm ≤ M ≤ 40 mm; The automatic lawn mower further includes a mechanism protective member. Horizontally, the mechanism protective member is located between the cutting mechanism and the movable protective member.

2. The automatic lawn mower according to claim 1, wherein: When the movable protective member is in a free state without external force, the ground clearance of the lower end of the blocking protrusion is greater than or equal to M / 2.

3. The automatic lawn mower according to claim 1 or 2, wherein: The movable protective wall further includes an upper blocking portion connected above the blocking protrusion. The outermost edge of the blocking protrusion does not completely overlap with the outer edge of the upper blocking portion. The portion of the blocking protrusion that does not overlap with the outermost edge of the upper blocking portion is located inside the corresponding portion of the outermost edge of the upper blocking portion.

4. The automatic lawn mower according to claim 1 or 2, wherein: The height h of the blocking protrusion ranges from: 0 mm < h ≤ 80 mm; the width M of the blocking protrusion ranges from 0 < m ≤ 40 mm; the distance S between two adjacent blocking protrusions ranges from 0 < S ≤ 40 mm.

5. The automatic lawn mower according to claim 1, wherein: The distance d between the outermost side of the blocking protrusion and the innermost side of the connecting protrusion ranges from: 1 mm ≤ d ≤ 100 mm; the height h of the blocking protrusion ranges from: 0 mm < h ≤ 80 mm; the width M of the blocking protrusion ranges from 0 < m ≤ 40 mm; the distance S between two adjacent blocking protrusions ranges from 0 < S ≤ 40 mm.

6. The automatic lawn mower according to claim 1, wherein: The connecting protrusion includes a V-shaped structure connecting two adjacent blocking protrusions.

7. The automatic lawn mower according to claim 1 or 2, characterized in that: The outermost edge of the blocking protrusion includes a safety locking area for preventing the upward movement of the movable protective wall.

8. The automatic lawn mower according to claim 7, wherein: The safety locking area includes an inclined surface extending obliquely downward from outside to inside. The angle at which the inclined surface of the safety locking area inclines inward from the vertical plane where its outermost end is located is less than or equal to 15 degrees.

9. The automatic lawn mower according to claim 8, wherein: The angle at which the inclined surface of the safety locking area inclines inward from the vertical plane where its outermost end is located is less than or equal to 3 degrees.

10. The automatic lawn mower according to claim 7, wherein: The safety locking area includes a vertical surface or an inclined surface extending upward from the outside to the inside.

11. The automatic lawn mower according to claim 7, wherein: The movable protective wall includes a main movable part located above the blocking protrusion, the main movable part includes an obstacle passing area located at its outermost edge, the obstacle passing area includes an inclined surface extending downward from the outside to the inside, the lower end of the safety locking area is less than M from the ground, and the safety locking area is located outside the downward extension line of the obstacle passing area on the same radial direction.

12. The automatic lawn mower according to claim 1, wherein: The movable protective wall includes at least one of a front movable protective wall located in front of the cutting mechanism, side movable protective walls located on both sides of the cutting mechanism, and a rear movable protective wall located behind the cutting mechanism.

13. The automatic lawn mower according to claim 12, wherein: The blocking protrusions are distributed at intervals along the circumferential direction at the bottom end of the entire movable protective wall.

14. The automatic lawn mower according to claim 1, wherein: The movable protective member is arranged on the outside of the shell, and / or between the cutting mechanism and the shell and / or connected to a part of the shell. In the horizontal direction, the minimum distance X between the outermost edge of the blocking protrusion and the cutting element is in the range of X≥58mm.

15. The automatic lawn mower according to claim 1, wherein: When the movable protective member moves upward due to an external force, the distance between the lower end of the blocking protrusion and the ground may be greater than or equal to M.

16. The automatic lawn mower according to claim 1 or 15, characterized in that: When the movable protective member moves upward due to an external force, the lower end of the blocking protrusion can move in the vertical direction within a range of 15-80 mm.

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