Anti-slip apparatus for lawn mower, lawn mower and lawn mower with multiple safety protection

Abstract

Provided are an anti-slip apparatus for a lawn mower, a lawn mower and a lawn mower with multiple safety protection. The anti-slip apparatus comprises a fixing frame (1), a telescopic member (2), an electromagnetic member (3) and an elastic member. The fixing frame (1) is used for connecting a frame (41) of a lawn mower (4); a through hole (11) is formed at an end portion of the fixing frame (1) adjacent to a hub (421) of the lawn mower (4); the telescopic member (2) passes through the through hole (11); the electromagnetic member (3) is provided inside the fixing frame (1); the elastic member is provided between the telescopic member (2) and the electromagnetic member (3); the electromagnetic member (3) is used for driving the telescopic member (2) to retract relative to the fixing frame (1) along the through hole (11); the elastic member is used for driving the telescopic member (2) to extend out of the fixing frame (1) along the through hole (11); when the telescopic member (2) extends out, an abutting end (21) of the telescopic member (2) abuts against the hub (421) to prevent from slipping. Even on a slope, the lawn mower (4) does not slip, thus ensuring safety during use.

Description

Anti-slip device for lawn mower, lawn mower, and lawn mower with multiple safety protections Technical Field

[0001] The present application relates to the technical field of lawn mowers, and in particular to an anti-slip device for a lawn mower, a lawn mower, and a lawn mower with multiple safety protections. Background Art

[0002] A lawn mower is a machine used to trim lawns and vegetation. It's widely used in private gardens, public green spaces, and professional lawns. Existing lawn mowers typically use a drive motor to power the wheels. In theory, turning off the drive motor stops the wheels and the mower stops moving. However, due to inertia, the mower often continues to move for a distance, causing it to slip. Furthermore, some lawns have slopes, and when the mower is on such a slope, the mower can slip due to its own gravity. This slipping phenomenon increases the risk of using a lawn mower.

[0003] Summary of the Invention

[0004] The main purpose of the present application is to provide an anti-slip device for a lawn mower, a lawn mower and a lawn mower with multiple safety protections; an anti-slip device for a lawn mower, comprising a fixed frame, a telescopic member, an electromagnetic member and an elastic member, the fixed frame being used to connect to the frame of the lawn mower, the end of the fixed frame adjacent to the wheel hub of the lawn mower being provided with a through-hole, the telescopic member being passed through the through-hole, the electromagnetic member being provided inside the fixed frame, the elastic member being provided between the telescopic member and the electromagnetic member, the electromagnetic member being used to drive the telescopic member to retract along the through-hole relative to the fixed frame, the elastic member being used to drive the telescopic member to extend along the through-hole relative to the fixed frame, the telescopic member being extended, the contact end of the telescopic member contacting the wheel hub to prevent the vehicle from slipping.

[0005] Based on the same concept, the present application also provides a lawn mower, comprising the above-mentioned anti-slip device for the lawn mower.

[0006] A lawn mower with multiple safety protections is also provided, including a dynamic detection unit, a distance detection unit and a protection unit. The dynamic detection unit is arranged on the front side of the lawn mower, and is used to detect dynamic obstacles on the front side of the lawn mower. A plurality of distance detection units are provided, and the plurality of distance detection units are arranged on the front side, left side and / or right side of the lawn mower; and are used to detect the distance between the lawn mower and the obstacle; a plurality of protection units are provided, and the plurality of protection units are arranged on the front side, left side and / or right side of the lawn mower; and are used to protect the lawn mower. BRIEF DESCRIPTION OF THE DRAWINGS

[0007] FIG1 is a schematic structural diagram of an embodiment of the present application;

[0008] FIG2 is a partially enlarged structural diagram of the connecting member at position A in FIG1 ;

[0009] FIG3 is a schematic structural diagram of a fixing frame according to an embodiment of the present application;

[0010] FIG4 is a circuit diagram of a drive motor connected to an electric adjustment board according to an embodiment of the present application;

[0011] FIG5 is a circuit diagram of another embodiment of the present application in which a drive motor is connected to an electric adjustment board;

[0012] FIG6 is a structural diagram of a lawn mower according to an embodiment of the present application;

[0013] FIG7 is a schematic structural diagram of the right side of an embodiment of the present application;

[0014] FIG8 is a schematic structural diagram of the left side of an embodiment of the present application;

[0015] FIG9 is a schematic structural diagram of a dynamic detection unit according to an embodiment of the present application;

[0016] FIG10 is a schematic structural diagram of a protection unit according to an embodiment of the present application;

[0017] FIG11 is a schematic structural diagram of the rear side of an embodiment of the present application;

[0018] FIG12 is a schematic structural diagram of the rear side of another embodiment of the present application. DETAILED DESCRIPTION

[0019] To facilitate understanding of the present invention, the present invention will be described in more detail below with reference to the accompanying drawings and specific embodiments. Preferred embodiments of the present invention are shown in the accompanying drawings. However, the present invention can be implemented in many different forms and is not limited to the embodiments described in this specification. Rather, these embodiments are provided to provide a more thorough and comprehensive understanding of the disclosure of the present invention.

[0020] It should be noted that, unless otherwise defined, all technical and scientific terms used in this specification have the same meanings as those commonly understood by those skilled in the art to which this invention pertains. The terms used in this specification are intended solely for the purpose of describing specific embodiments and are not intended to limit the invention. The term "and / or" as used in this specification includes any and all combinations of one or more of the associated listed items.

[0021] Figures 1 to 6 show an embodiment of an anti-slip device for a lawn mower of the present application, including a fixed frame 1, a telescopic member 2, an electromagnetic member 3 and an elastic member. The fixed frame 1 is used to connect to the frame 41 of the lawn mower 4. The end of the fixed frame 1 adjacent to the wheel hub 421 of the lawn mower 4 is provided with a through hole 11. The telescopic member 2 is penetrated in the through hole 11. The electromagnetic member 3 is arranged inside the fixed frame 1. The elastic member is arranged between the telescopic member 2 and the electromagnetic member 3. The electromagnetic member 3 is used to drive the telescopic member 2 to retract relative to the fixed frame 1 along the through hole 11. The elastic member is used to drive the telescopic member 2 to extend relative to the fixed frame 1 along the through hole 11. The telescopic member 2 is extended, and the contact end 21 of the telescopic member 2 contacts the wheel hub 421. Due to the action of friction, the lawn mower 4 is prevented from slipping, wherein the end of the telescopic member 2 close to the end face of the wheel hub 421 is the contact end 21.

[0022] When the power is on, the electromagnetic member 3 is magnetic, driving the telescopic member 2 to retract along the through hole 11 relative to the fixed frame 1. When the power is off, the magnetism of the electromagnetic member 3 disappears, and the elastic member drives the telescopic member 2 to extend along the through hole 11 relative to the fixed frame 1. When the telescopic member 2 is extended, the abutting end 21 of the telescopic member 2 abuts on the wheel hub 421. Due to the effect of friction, the wheel 42 can be prevented from rotating by inertia and slipping. In addition, the lawn mower 4 will not slip due to its own gravity even on a slope, thereby ensuring the safety of the lawn mower 4 when in use.

[0023] In some embodiments, the electromagnetic component 3 is connected to the drive motor of the lawn mower 4, and the electromagnetic component 3 and the drive motor are powered on and off at the same time. When the electromagnetic component 3 is powered on, the telescopic component 2 retracts, ensuring that when the drive motor is powered on, the telescopic component 2 can retract at the moment the wheel 42 starts to rotate, and does not block the rotation of the wheel 42; when the electromagnetic component 3 is powered off, the telescopic component 2 extends, ensuring that after the drive motor is powered off, the telescopic component 2 can extend at the moment the wheel 42 starts to rotate by inertia, thereby ensuring the timeliness of the telescopic coordination of the telescopic component 2.

[0024] In some embodiments, a rotating disk 422 is provided on the wheel hub 421, the telescopic member 2 is extended, and the contact end 21 contacts the rotating disk 422 to prevent slipping. The rotating disk 422 is provided on the outer ring of the wheel hub 421. At the same rotation speed, since the friction distance between the contact end 21 and the rotating disk 422 is longer, the friction between the contact end 21 and the rotating disk 422 generates a greater braking force, which better prevents the wheel 42 from rotating due to inertia.

[0025] In some embodiments, the end surface of the rotating disk 422 adjacent to the telescopic member 2 is rough. When the contact end 21 contacts the rotating disk 422, the rough surface can increase the friction between the contact end 21 and the rotating disk 422, thereby better preventing the vehicle from slipping.

[0026] As shown in Figure 2, in some embodiments, a connecting member 4221 is provided on the end surface of the rotating disk 422 adjacent to the telescopic member 2, and the connecting member 4221 is fixed at a corresponding position of the rotating disk 422. The connecting member 4221 is provided with a groove or through hole 42211 adapted to the interference end 21. That is to say, when the interference end 21 is in the shape of a circle, triangle, or polygon, a circular, triangular, or polygonal groove or through hole 42211 of corresponding size is provided on the connecting member 4221 to ensure that when the telescopic member 2 is extended, the interference end 21 can be able to interfere with the groove or through hole 42211, locking the rotating disk 422 so that the wheel 42 no longer rotates, and the vehicle will not slip due to inertia or the influence of its own gravity.

[0027] In some embodiments, there are multiple connecting members 4221, which are evenly spaced on the rotating disk 422. No matter where the wheel 42 rotates to, when the telescopic member 2 is extended, it can be stuck in the groove or through hole 42211 of the nearest connecting member 4221, which can quickly stop the wheel 42 from rotating and prevent the lawn mower 4 from slipping.

[0028] In some embodiments, a plurality of grooves or through holes 42211 are arranged at intervals on the end surface of the rotating disk 422 adjacent to the telescopic part 2. The grooves or through holes 42211 mentioned here are directly and integrally arranged on the rotating disk 422. Compared with specially arranging a connecting part 4221 on the rotating disk 422, it is simpler and more convenient. When the telescopic part 2 is extended, the contact end 21 contacts the groove or through hole 42211 on the rotating disk 422 to prevent the vehicle from slipping.

[0029] As shown in Figure 3, in some embodiments, the fixed frame 1 includes an extension sub-frame 12 and a accommodating sub-frame 13. The accommodating sub-frame 13 is arranged at the outer end of the extension sub-frame 12. The extension sub-frame 12 is provided with a special connecting side plate 121 for the accommodating sub-frame 13 to be arranged on it. The extension sub-frame 12 is used to connect to the frame 41 of the lawn mower 4 and extend the position of the accommodating sub-frame 13 to ensure that the telescopic part 2 on the accommodating sub-frame 13 can correspond to the position of the connecting part 4221 on the rotating disk 422; the extension bracket is also provided with an opening 122, and the opening 122 is engaged with the tubular bracket of the frame 41 to ensure the stability of the installation. The accommodating sub-frame 13 is used to set the telescopic part 2, the elastic part and the electromagnetic part 3.

[0030] As shown in FIG4 , in some embodiments, the lawn mower 4 includes an electronic control board (ESC) 43 , which can be generally referred to as a motor regulator. The ESC 43 converts the input power into different voltages and outputs the voltages to the drive motor 44 , thereby causing the drive motor 44 to generate different speeds. The ESC 43 is connected to multiple phase lines of the drive motor 44 , and an on-off switch 45 is connected between adjacent phase lines. The drive motor 44 can be a three-phase drive motor, and the on-off switch 45 can be a relay. The three phase lines drawn from the three-phase drive motor are directly connected to the ESC 43 , and two relays are respectively arranged between adjacent phase lines. When the power is off, the relay short-circuits the three phase lines of the three-phase drive motor, and the wiring of the three input terminals of the three-phase drive motor are connected together to form a closed loop. When the three-phase drive motor rotates, a reverse electromotive force is generated, which generates a current in the short-circuited three-phase winding, thereby generating a reverse torque to prevent the three-phase drive motor from rotating.

[0031] As shown in FIG5 , in some embodiments, the power adjustment board 430 and the drive motor 440 can be connected via an on-off switch 450 , i.e., one end of the on-off switch 450 is connected to one of the phase lines, and the other end is connected to the corresponding phase line, or an adjacent phase line. When the on-off switch 450 is connected to the corresponding phase line, the power adjustment board 430 and the drive motor 440 are connected. When the on-off switch 450 is connected to the adjacent phase line, the phase line of the drive motor 440 is short-circuited, and the wiring at the input end of the drive motor 440 is connected together to form a closed loop. When the drive motor 440 rotates, a reverse electromotive force is generated, which generates a current in the short-circuited three-phase winding, thereby generating a reverse torque, preventing the drive motor 440 from rotating.

[0032] According to actual needs, the drive motor 44 can also be a motor with fewer phases or more phases, and the on-off switch 45 can be a bidirectional switch, etc.

[0033] As shown in FIG6 , based on the same concept, the present application also provides a lawn mower 4 , including the above-mentioned anti-slip device for the lawn mower. According to actual needs, one or more anti-slip devices can be selectively provided on the lawn mower 4 .

[0034] It can be seen that the present application discloses an anti-slip device for a lawn mower and a lawn mower. When power is on, the electromagnetic part is magnetic, driving the telescopic part to retract along the perforation relative to the fixed frame. When power is off, the magnetism of the electromagnetic part disappears, and the elastic part drives the telescopic part to extend along the perforation relative to the fixed frame. When the telescopic part is extended, the resistance end of the telescopic part contacts the wheel hub or the rotating disk. Due to the action of friction, the lawn mower is prevented from slipping; further, by providing a connecting part with a groove or a through hole on the rotating disk, or directly providing a groove or a through hole on the rotating disk to lock the extended resistance end, it is ensured that the lawn mower will not slip even on a slope; further, by providing a power switch between the electric adjustment board and the phase line of the drive motor, the phase line is short-circuited when power is off, so that the drive motor generates a reverse electromotive force to further prevent the lawn mower from slipping.

[0035] Figures 7 to 12 show an embodiment of a lawn mower with multiple safety protections of the present application, including a dynamic detection unit 1, a distance detection unit 2 and a protection unit 3. The dynamic detection unit 1 is arranged on the front side of the lawn mower to detect dynamic obstacles on the front side of the lawn mower. There are multiple distance detection units 2, and multiple distance detection units 2 are arranged on the front side, left side and / or right side of the lawn mower; for detecting the distance between the lawn mower and the obstacle; there are multiple protection units 3, and multiple protection units 3 are arranged on the front side, left side and / or right side of the lawn mower; for protecting the lawn mower.

[0036] In this application, a dynamic detection unit 1 detects dynamic obstacles in front of the lawn mower, and multiple distance detection units 2 detect the distance between the front, left, and / or right sides of the lawn mower and the obstacles. Based on the real-time detection results of the dynamic detection unit 1 and the distance detection unit 2, the lawn mower avoids dynamic and static obstacles, thus achieving dual safety protection for the lawn mower. At the same time, multiple protection units 3 are arranged on the front, left, and / or right sides of the lawn mower, providing a third level of safety protection when the lawn mower accidentally collides with an obstacle due to failure to detect the obstacle.

[0037] Preferably, as shown in FIG9 , the dynamic detection unit 1 includes a first camera module 11, a second camera module 12, and a third camera module 13. The second camera module 12 is arranged in the middle of the front side of the lawn mower for detecting dynamic obstacles. The first camera module 11 and the third camera module 13 are arranged on both sides of the second camera module 12 for acquiring images of the front side of the lawn mower. The second camera module 12 is a combination of a camera and a dynamic vision sensor or an infrared sensor. The camera can be a wide-angle camera or a telephoto camera, etc. The camera is used to acquire images, and the dynamic vision sensor or infrared sensor detects dynamic obstacles. After the second camera module 12 detects a dynamic obstacle, it sends a signal to the lawn mower, and the lawn mower avoids the dynamic obstacle. The second camera module 12 can capture dynamic obstacles coming from multiple directions, allowing the lawn mower to avoid dynamic obstacles from different directions in a timely manner. The first camera module 11 and the third camera module 13 can be wide-angle cameras, telephoto cameras, macro cameras, or a combination of these cameras, as long as they can capture a clear image of the front of the lawn mower. The first camera module 11 and the third camera module 13 simultaneously monitor the front of the lawn mower, providing a wider monitoring range and thereby capturing an all-around image of the front of the lawn mower.

[0038] The dynamic detection unit 1 can detect dynamic obstacles, and static obstacles are detected by the distance detection unit 2. The distance detection unit 2 detects the distance between the lawn mower and the static obstacle and feeds back the signal to the lawn mower. The lawn mower avoids the static obstacle, further improving the safety protection of the lawn mower.

[0039] The distance detection unit 2 can be a laser radar or a millimeter wave radar. The laser radar detects by emitting a light beam, and has a narrow detection range. When the light beam is blocked, it cannot be used normally.

[0040] Preferably, the distance detection unit 2 is a millimeter-wave radar. Two millimeter-wave radars are installed on either side of the front side of the lawn mower, one on the left side of the lawn mower, and one on the right side of the lawn mower. The distance detection unit 2 detects the distance between the front, left, and right sides of the lawn mower and obstacles in real time. The lawn mower avoids obstacles based on the detection data of the distance detection unit 2.

[0041] The millimeter-wave radar can be directly installed on the frame of the lawn mower. When installed on the frame, it is inconvenient to adjust the position and angle of the millimeter-wave radar on the frame, which leads to a reduced detection range.

[0042] Preferably, as shown in FIG10 , three protection units 3 are provided, one on the front side, the other on the left side, and the other on the right side of the lawn mower. The protection unit 3 is provided with a mounting slot 31 corresponding to the millimeter-wave radar. The mounting slot 31 is used to mount the millimeter-wave radar. The millimeter-wave radar is mounted in the mounting slot 31 at a suitable angle using adhesive.

[0043] The installation height of the millimeter-wave radar cannot be too high or too low, and the tilt angle cannot be set arbitrarily. The installation height and tilt angle of the millimeter-wave radar should be adjusted reasonably to make the detection effect of the millimeter-wave radar better and the detection range larger, thereby providing better protection for the lawn mower.

[0044] Preferably, the millimeter-wave radar is 20-25 cm above the ground, with the two millimeter-wave radars on the front side raised 5-20 degrees toward the center and upward of the mower; and the millimeter-wave radars on the left and right sides are tilted 10-30 degrees toward the front of the mower. In this embodiment, the millimeter-wave radar is 23 cm above the ground, with the two millimeter-wave radars on the front side raised 15 degrees toward the center and upward of the mower; and the millimeter-wave radars on the left and right sides are tilted 20 degrees toward the front of the mower. Properly setting the angle and height reduces detection blind spots, maximizes the radar's coverage area, improves the detection effect of the millimeter-wave radar, and increases the detection range of the millimeter-wave radar.

[0045] By placing multiple distance detection units 2 on both sides of the front, left, and right sides of the lawn mower, static obstacles can be detected on the front, left, and right sides of the lawn mower. The addition of distance detection units 2 to the dynamic detection unit 1 allows the lawn mower to avoid both dynamic and static obstacles, providing dual safety protection.

[0046] When the dynamic detection unit 1 and the distance detection unit 2 do not detect an obstacle, the lawn mower collides with the obstacle. At this time, the lawn mower has a third level of safety protection, which is a protection unit 3 set on the front side, left side and right side of the lawn mower.

[0047] Preferably, as shown in FIG10 , the protection unit 3 includes a flexible housing 32 and a support housing 33. The support housing 33 is mounted on the lawn mower, and the flexible housing 32 is mounted on the support housing 33. The flexible housing 32 is used to cushion the force of a collision between the lawn mower and an obstacle. The flexible housing 32 can be made of a flexible material such as rubber or foam. When the lawn mower collides with an obstacle, the flexible housing 32 first contacts the obstacle, cushioning the force generated by the collision, thereby protecting the lawn mower and preventing damage.

[0048] The protection unit 3 further includes a pressure detection component 34 , which is disposed between the flexible housing 32 and the support housing 33 . The pressure detection component 34 is used to detect the force of the collision between the lawn mower and an obstacle.

[0049] Preferably, as shown in FIG10 , the pressure detection assembly 34 includes a back plate 341 and at least one pressure sensing unit 342. The back plate 341 is arranged on the outside of the support shell 33, and the back plate 341 and the support shell 33 are fastened by screws. The pressure sensing unit 342 is arranged on the outside of the back plate 341, and the flexible shell 32 covers the outside of the pressure sensing unit 342. During a collision, the obstacle first contacts the flexible shell 32, which acts as a buffer, and does not directly damage the pressure sensing unit 342 arranged in the flexible shell 32. The back plate 341 supports the pressure sensing unit 342, and the pressure sensing unit 342 is sandwiched between the flexible shell 32 and the back plate 341 to detect the force during a collision.

[0050] When only one pressure sensing unit 342 is provided, the detection effect is poor due to its small coverage area. When the collision forces come from different directions, the detection sensitivity of the single pressure sensing unit 342 is low, and the detection data is inaccurate. The pressure sensing unit 342 can be a thin film pressure sensor or other type of pressure sensor, as long as it can detect the force of the collision.

[0051] Preferably, the pressure sensing unit 342 is a thin film pressure sensor that matches the shape of the back plate 341 and is fixed to the back plate 341 by adhesive. The thin film pressure sensor is made of a flexible material and can be bent and folded to better fit the back plate 341 and improve detection accuracy.

[0052] Two thin film pressure sensors are provided, one located in the convex middle portion of the back plate 341 and the other located in the concave lower portion of the back plate 341. The two thin film pressure sensors detect the forces acting on the middle and lower portions of the protection unit 3, respectively, providing more accurate data.

[0053] When the lawn mower collides with an obstacle, the flexible housing 32 acts as a buffer to the force generated by the collision, reducing damage to the lawn mower. The pressure detection component 34 detects the force generated by the collision to facilitate subsequent analysis of the collision results.

[0054] When a lawn mower is mowing, the grass discharge cover 4 or grass collection frame 5 at the rear of the mower is closed to facilitate grass discharge. If the cover 4 or grass collection frame 5 is open, grass will be discharged directly behind the mower, splashing waste grass and potentially injuring the operator. Therefore, it is necessary to inspect the opening and closing of the grass discharge cover 4 or grass collection frame 5 at the rear of the mower.

[0055] Preferably, as shown in FIG11 and FIG12 , a contact switch 6 is provided on the rear side of the lawn mower, and the contact switch 6 is used to detect the opening and closing of the grass discharge port cover 4 or the grass collecting frame 5 on the rear side of the lawn mower.

[0056] Preferably, contact switch 6 is a Hall effect switch. When the grass discharge cover 4 is installed on the rear side of the mower, a magnetic element 7 is provided on the cover, which corresponds to the Hall effect switch. When the cover 4 is closed, the magnetic element 7 approaches the Hall effect switch; when the cover 4 is opened, the magnetic element 7 moves away from the Hall effect switch. The proximity or distance between the magnetic element 7 and the Hall effect switch changes the voltage of the Hall effect switch, thereby determining whether the cover 4 is open or closed.

[0057] When the contact switch 6 detects that the grass discharge port cover 4 is opened, the lawn mower stops mowing, preventing waste grass from splashing and injuring the operator, thereby improving the safety of the lawn mower.

[0058] When the grass collecting frame 5 is installed on the rear side of the mower, it is equipped with a magnetic element 7 that corresponds to a Hall effect switch. When the grass collecting frame 5 is closed, the magnetic element 7 moves away from the Hall effect switch. The proximity or separation of the magnetic element 7 from the Hall effect switch changes the voltage of the Hall effect switch, thereby determining whether the grass collecting frame 5 is open or closed. When the contact switch 6 detects that the grass collecting frame 5 is open, the mower stops mowing, preventing waste grass from splashing and injuring the operator, thereby improving the safety of the mower.

[0059] As can be seen, this application discloses a lawn mower with multiple safety protections. A dynamic detection unit detects dynamic obstacles in front of the mower, and multiple distance detection units detect the distances between the front, left, and right sides of the mower and the obstacles. Based on the real-time detection results of the dynamic and distance detection units, the mower avoids dynamic and static obstacles, thus achieving dual safety protection for the mower. Furthermore, multiple protection units are positioned on the front, left, and right sides of the mower, providing a third level of safety protection if the mower accidentally collides with an obstacle due to undetected obstacles.

[0060] The above are merely embodiments of the present application and are not intended to limit the patent scope of the present application. Any equivalent structural transformations made using the contents of the present application specification and drawings, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present application.

Claims

1. An anti-slip device for a lawn mower, characterized in that: The utility model comprises a fixing frame, a telescopic member, an electromagnetic member and an elastic member, wherein the fixing frame is used to connect to the frame of the lawn mower, the end of the fixing frame adjacent to the wheel hub of the lawn mower is provided with a through hole, the telescopic member is penetrated in the through hole, the electromagnetic member is arranged inside the fixing frame, the elastic member is arranged between the telescopic member and the electromagnetic member, the electromagnetic member is used to drive the telescopic member to retract along the through hole relative to the fixing frame, the elastic member is used to drive the telescopic member to extend along the through hole relative to the fixing frame, the telescopic member is extended, and the abutting end of the telescopic member abuts against the wheel hub to prevent the vehicle from slipping.

2. The anti-slip device for a lawn mower according to claim 1, characterized in that: The electromagnetic component is connected to the driving motor of the lawn mower, and the electromagnetic component and the driving motor are powered on and off at the same time. When the electromagnetic component is powered on, the telescopic component retracts, and when the electromagnetic component is powered off, the telescopic component extends.

3. The anti-slip device for a lawn mower according to claim 2, characterized in that: The wheel hub is provided with a rotating disk, the telescopic member is extended, and the abutting end abuts against the rotating disk to prevent the vehicle from slipping.

4. The anti-slip device for a lawn mower according to claim 3, characterized in that: The end surface of the rotating disk adjacent to the telescopic member is a rough surface.

5. The anti-slip device for a lawn mower according to claim 3, characterized in that: A connecting piece is arranged on the end surface of the rotating disk adjacent to the telescopic piece, and a groove or a through hole matching with the abutting end is arranged on the connecting piece. When the telescopic piece is extended, the abutting end abuts in the groove or the through hole to prevent the vehicle from slipping.

6. The anti-slip device for a lawn mower according to claim 5, characterized in that: The connecting members are provided in plurality and are evenly distributed on the rotating disk.

7. The anti-slip device for a lawn mower according to claim 3, characterized in that: A plurality of grooves or through holes are arranged at intervals on the end surface of the rotating disk adjacent to the telescopic member. The telescopic member is extended, and the abutting end abuts against the grooves or through holes to prevent the vehicle from slipping.

8. The anti-slip device for a lawn mower according to claim 1, characterized in that: The fixed frame includes an extension sub-frame and a accommodating sub-frame, wherein the accommodating sub-frame is arranged at the outer end of the extension sub-frame, the extension sub-frame is used to connect the frame of the lawn mower and extend the position of the accommodating sub-frame, and the accommodating sub-frame is used to arrange the telescopic member, the elastic member and the electromagnetic member.

9. The anti-slip device for a lawn mower according to claim 2, characterized in that: The lawn mower includes an electric adjustment board, which is connected to multiple phase lines of the drive motor. An on-off switch is connected between adjacent phase lines. The on-off switch is used to short-circuit the phase lines so that the drive motor generates a reverse electromotive force to prevent the motor from slipping.

10. A lawn mower, characterized in that: The anti-slip device for a lawn mower comprises the device described in any one of claims 1 to 9.

11. A lawn mower with multiple safety protections, characterized in that: It includes a dynamic detection unit, a distance detection unit and a protection unit. The dynamic detection unit is arranged on the front side of the lawn mower to detect dynamic obstacles on the front side of the lawn mower. There are multiple distance detection units, which are arranged on the front side, left side and / or right side of the lawn mower to detect the distance between the lawn mower and the obstacle. There are multiple protection units, which are arranged on the front side, left side and / or right side of the lawn mower to protect the lawn mower.

12. The lawn mower with multiple safety protections according to claim 11, characterized in that: The protection unit includes a flexible shell and a support shell. The support shell is arranged on the lawn mower. The flexible shell is arranged on the support shell. The flexible shell is used to buffer the force of the lawn mower colliding with the obstacle.

13. The lawn mower with multiple safety protections according to claim 12, characterized in that: The protection unit further comprises a pressure detection component, which is arranged between the flexible shell and the support shell and is used to detect the force of the collision between the lawn mower and the obstacle.

14. The lawn mower with multiple safety protections according to claim 13, characterized in that: The pressure detection component includes a back plate and at least one pressure sensing unit. The back plate is arranged on the outside of the supporting shell, the pressure sensing unit is arranged on the outside of the back plate, and the flexible shell covers the outside of the pressure sensing unit.

15. The lawn mower with multiple safety protections according to claim 14, characterized in that: The pressure sensing unit is a thin film pressure sensor, which is adapted to the shape of the back plate; two thin film pressure sensors are provided, one of which is provided at the protruding middle part of the back plate, and the other is provided at the concave lower part of the back plate.

16. The lawn mower with multiple safety protections according to claim 11, characterized in that: The dynamic detection unit includes a first camera module, a second camera module and a third camera module. The second camera module is arranged in the middle of the front side of the lawn mower to detect the dynamic obstacle. The first camera module and the third camera module are arranged on both sides of the second camera module to obtain the image of the front side of the lawn mower.

17. The lawn mower with multiple safety protections according to claim 11, characterized in that: The distance detection unit is a millimeter wave radar, two of the millimeter wave radars are arranged on both sides of the front side of the lawn mower, one of the millimeter wave radars is arranged on the left side of the lawn mower, and one of the millimeter wave radars is arranged on the right side of the lawn mower; The protection units are provided with three, which are respectively located on the front side, the left side and the right side of the lawn mower. The protection units are provided with installation grooves corresponding to the millimeter-wave radars, and the installation grooves are used to set the millimeter-wave radars.

18. The lawn mower with multiple safety protections according to claim 17, characterized in that: The height of the millimeter-wave radar from the ground is 20cm-25cm, and the two millimeter-wave radars on the front side are raised 5°-20° upward toward the middle of the lawn mower; the millimeter-wave radars on the left and right sides are inclined 10°-30° toward the front of the lawn mower.

19. The lawn mower with multiple safety protections according to claim 11, characterized in that: A contact switch is arranged on the rear side of the lawn mower, and the contact switch is used to detect the opening and closing of the grass discharge port cover or the grass collecting frame on the rear side of the lawn mower.

20. The lawn mower with multiple safety protections according to claim 19, characterized in that: The contact switch is a Hall switch, and a magnetic piece corresponding to the Hall switch is arranged on the grass discharge port cover and / or the grass collecting frame.

Images