Lifting limiting device and mowing device

Abstract

The application relates to the field of grass cutting equipment, aims to solve the problem of damage to the grass cutting equipment or the lawn caused by the excessively low downward movement of the cutter head of the grass cutting equipment, and provides a lifting limiting device and grass cutting equipment. The lifting limiting device comprises a swing arm and a limiting structure. One end of the swing arm is rotatably connected to the vehicle body of the grass cutting equipment and can rotate relative to the vehicle body; the other end of the swing arm is connected to the cutter head of the grass cutting equipment and is used for driving the cutter head to ascend and descend relative to the vehicle body. The limiting structure is arranged on the swing arm and / or the vehicle body, and when the cutter head descends to a set lower limit position, the limiting structure can limit the rotation of the swing arm. The application has the beneficial effect that the rotation of the swing arm can be limited at the lower limit position, the downward movement of the cutter head beyond the lower limit position is limited, and the damage or other safety risks caused by the ground dragging of the cutter head can be effectively reduced.

Description

Technical Field

[0001] This application relates to the field of lawn mowing equipment, and more specifically, to lifting and limiting devices and lawn mowing equipment. Background Technology

[0002] Existing lawn mowing equipment may damage the cutter head, lifting drive components, or other structures, or even damage the lawn and cause safety accidents, due to the cutter head colliding with protruding stones on the ground during the mowing process. Utility Model Content

[0003] This application provides a lifting limit device and a lawn mowing equipment to solve the problem of the lawn mowing equipment or lawn being damaged due to the blades of the lawn mowing equipment falling too low.

[0004] In a first aspect, embodiments of this application provide a lifting and limiting device for a lawn mowing device. The lifting and limiting device includes a swing arm and a limiting structure. One end of the swing arm is rotatably connected to the body of the lawn mowing device and is capable of rotating relative to the body; the other end of the swing arm is connected to the cutter head of the lawn mowing device, used to drive the cutter head to rise and fall relative to the body. The limiting structure is disposed on the swing arm and / or the body, and when the cutter head descends to a set lower limit position, the limiting structure can restrict the rotation of the swing arm.

[0005] The lifting limit device in this embodiment can restrict the rotation of the swing arm at the lower limit position, thereby limiting the downward movement of the cutter head beyond the lower limit position, which can effectively reduce the damage caused by the cutter head dragging on the ground or causing other safety risks.

[0006] In one possible implementation, the limiting structure includes a first limiting portion. The first limiting portion is connected to the swing arm. When the cutter head is at its lower limit position, the first limiting portion abuts against the vehicle body.

[0007] In one possible implementation, the first limiting part and the swing arm are connected to form an angle, the rotation center of the swing arm relative to the vehicle body is located in the angle region between the first limiting part and the swing arm, the surface of the first limiting part away from the swing arm is the limiting surface, and when the cutter head is in the lower limit position, the limiting surface abuts against the vehicle body.

[0008] In one possible implementation, the vehicle body has a bottom surface, and the limiting structure includes a limiting member connected to one end of the swing arm near the cutter head along the height direction of the mowing equipment, with the limiting member protruding downward from the bottom surface. The vehicle body is located on the rotation path of the limiting member, and when the cutter head rotates with the swing arm to its lower limit position, the limiting member abuts against the vehicle body.

[0009] In one possible implementation, when the cutter head is at a set upper limit position, the cutter head can abut against the limiting member in the horizontal direction.

[0010] In one possible implementation, the vehicle body has a recessed groove from the bottom surface. A limiting member protrudes from the groove. When the cutter head is not in the lower limit position, there is a gap between the side of the groove and the limiting member. When the cutter head moves to the lower limit position, the limiting member abuts against the side of the groove to limit the cutter head from continuing to descend.

[0011] In one possible implementation, there are two swing arms, arranged parallel and spaced apart; the cutter head, the car body, and the two swing arms are connected to form a parallel four-bar linkage. One of the two swing arms is provided with a limit structure, or both swing arms are provided with limit structures.

[0012] In one possible implementation, the limiting structure includes a second limiting portion. The second limiting portion is connected to the vehicle body. When the cutter head is in the lower limit position, the swing arm abuts against the second limiting portion.

[0013] In one possible implementation, the limiting structure includes a first limiting part and a second limiting part. The first limiting part is connected to the swing arm, and the second limiting part is connected to the vehicle body. When the cutter head is at its lower limit position, the first limiting part abuts against the second limiting part.

[0014] In one possible implementation, the limiting structure further includes a third limiting part. The third limiting part is provided on the vehicle body. When the cutter head is at a set upper limit position, the cutter head can abut against the third limiting part in the horizontal direction.

[0015] In one possible implementation, the limiting structure further includes a sensing element and a sensed component. The sensing element is located on the vehicle body, and the sensed component is located on the cutter head. When the cutter head is at a set upper limit position, the sensing element can sense the sensed component and generate a sensing signal; the sensing signal is used to instruct the mowing equipment to stop moving and / or instruct the cutter head to stop rotating.

[0016] Secondly, embodiments of this application provide a lawn mowing device, which includes a vehicle body, a blade disc, and the aforementioned lifting and limiting device. A swing arm is connected between the blade disc and the vehicle body. Attached Figure Description

[0017] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings in the embodiments will be briefly described below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 This is a perspective view of the lawn mowing device according to an embodiment of this application.

[0019] Figure 2 for Figure 1 A bottom view of the lawnmower equipment.

[0020] Figure 3 for Figure 1 A 3D view of the blade and lifting limit device of a lawnmower.

[0021] Figure 4 for Figure 3 Side view.

[0022] Figure 5 for Figure 1 A schematic diagram of the cutter head of a grass cutter in its lower limit position.

[0023] Figure 6 This is a schematic diagram of another embodiment of the lawn mowing equipment in this example.

[0024] Figure 7 This is a schematic diagram of another embodiment of the lawn mowing equipment in this example, wherein the vehicle body is simplified.

[0025] Figure 8 for Figure 7 A schematic diagram of the cutter head of a grass cutter in its lower limit position.

[0026] Figure 9 for Figure 7 A schematic diagram of a lawnmower viewed from below.

[0027] Figure 10 This is a schematic diagram showing the arrangement of the sensing element and the sensed element of the lawn mowing device in this embodiment.

[0028] Key component symbols: 100-Mowing equipment; 10-Body; 11-Body frame; 12-Front wheel mounting part; 13-Rear wheel mounting part; 14-Second limiting part; 20-Cutter disc; 21-Cutter disc holder; 211-Bowl-shaped part; 212-Bowl rim; 22-Cutter body; 23-Cutter body drive component; 30-Lifting and limiting device; 31-Swing arm; 311-Arm; 312-Connecting crossbar; 32-Limiting structure; 321-First limiting part; 322-Limiting component; 323-Third limiting part; 324-Sensing element; 325-Sensed component; 33-Rotating shaft component; P1-Bottom surface; P2-Limiting surface; C1-Groove; f1-Gap; K1-Avoidance opening; X-Front-back direction; X1-Forward direction; Y-Width direction; Z-Height direction. Detailed Implementation

[0029] The technical solutions in the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments.

[0030] It should be noted that when a component is said to be "fixed to" another component, it can be directly on the other component or there may be an intervening component. When a component is said to be "connected to" another component, it can be directly connected to the other component or there may be an intervening component. When a component is said to be "set on" another component, it can be directly set on the other component or there may be an intervening component. The terms "vertical," "horizontal," "left," "right," and similar expressions used in this document are for illustrative purposes only.

[0031] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0032] Some embodiments of this application are described in detail. Unless otherwise specified, the following embodiments and features can be combined with each other.

[0033] Example

[0034] Figure 1 This is a perspective view of the lawn mowing device 100 in this embodiment. Figure 2 for Figure 1 A bottom view of a lawnmower 100.

[0035] See Figure 1 and Figure 2 The lawn mowing equipment 100 provided in this embodiment can be a lawn mowing vehicle (or a lawn mowing robot) and can be used for lawn mowing and other operations.

[0036] The lawn mowing equipment 100 may include a vehicle body 10, a cutter head 20, and a lifting and limiting device 30.

[0037] The vehicle body 10 can travel on the lawn to change the position of the lawnmower 100. The vehicle body 10 can be driven by electricity, an internal combustion engine, or manually. The vehicle body 10 can be controlled by a person to control its travel path, or it can be controlled by an automatic control system to travel automatically along a set path.

[0038] The vehicle body 10 may include components such as a body 11 and a driving system. It should be noted that the wheels of the driving system (which may include front and rear wheels) are not shown. Specifically, the vehicle body 10 includes one front wheel mounting portion 12 and two rear wheel mounting portions 13. The front wheel mounting portion 12 is used to mount the front wheels, and the rear wheel mounting portions 13 are used to mount the rear wheels. The vehicle body 10 may be rear-wheel drive, meaning the rear wheels are the driving wheels.

[0039] Combination Figures 1-3 The cutter head 20 may include a cutter head holder 21, a blade body 22, and a blade body drive 23. The blade body 22 is rotatably mounted on the cutter head holder 21 and can rotate under the drive of the blade body drive 23 (such as a motor) to cut grass. In this embodiment, along the height direction Z of the mowing equipment 100, the blade body 22 is located below the cutter head holder 21, the blade body drive 23 is mounted above the cutter head 20, and the output shaft of the blade body drive 23 passes through the cutter head holder 21 and is connected to the blade body 22.

[0040] There can be one or more blades 22. For example... Figure 2 and Figure 3 As shown, there are two blade bodies 22, and each blade body 22 is driven to rotate by two blade body drive members 23.

[0041] In use, the lawnmower 100 moves across the lawn driven by the driving system. Simultaneously, the blade 22 rotates to cut grass at a certain height. The blade holder 21 acts as a barrier, preventing the cut grass from rising and entering other parts of the vehicle body 10. The blade holder 21 can have a large coverage area, meaning its projected area along the height direction Z of the lawnmower 100 is large, thus achieving a wide-range barrier effect.

[0042] The cutter holder 21 can be configured to be approximately bowl-shaped, including a downward-opening bowl-shaped portion 211 and a bowl rim 212 connected to the lower edge of the bowl-shaped portion 211, as can be seen in [the following text is missing from the original]. Figure 3 .

[0043] In this embodiment, in the forward / backward direction X of the lawnmower 100, the swing arm 31 is positioned behind the cutter head 20; or, in other words, the connection point between the swing arm 31 and the vehicle body 10 is located after the connection point between the swing arm 31 and the cutter head 20. The forward direction X1 of the lawnmower 100 during normal lawnmower operation is the forward direction of the lawnmower 100. Of course, when the lawnmower 100 stops mowing and returns to the base station or its storage location, it can also travel backward, i.e., in the rearward direction.

[0044] In other embodiments, the swing arm 31 may also be positioned in front of the cutter head 20.

[0045] The lawn mowing equipment 100 in this embodiment also includes a lifting limit device 30, which is used to drive the cutter head 20 to rise and fall, and has the function of limiting the lower limit position of the cutter head 20. In some embodiments, the lifting limit device 30 also has the function of limiting the upper limit position of the cutter head 20. The lower limit position and the upper limit position of the cutter head 20 can be set according to actual needs, such as according to the flatness requirements of the lawn surface and the mowing height requirements.

[0046] The lifting limit device 30 of this embodiment will be described below by way of example.

[0047] like Figures 1-3 As shown, the lifting limit device 30 includes a swing arm 31 and a limiting structure 32.

[0048] One end of the swing arm 31 is rotatably connected to the body 10 of the mowing equipment 100 and can rotate relative to the body 10. The other end of the swing arm 31 is connected to the cutter head 20 of the mowing equipment 100 and is used to drive the cutter head 20 to rise and fall relative to the body 10.

[0049] In this embodiment, the connection between the swing arm 31 and the cutter head 20 can be a rotatable connection. For example, as shown in the figure, the swing arm 31 is rotatably connected to the cutter body drive member 23 of the cutter head 20. When the cutter body drive member 23 is a motor, the swing arm 31 can be rotatably connected to the motor housing.

[0050] In an embodiment with two blade drive members 23, the swing arm 31 includes two arms 311, which are rotatably connected between the two blade drive members 23 and the vehicle body 10. Optionally, the swing arm 31 may also include a connecting crossbar 312, which connects the two arms 311, making the swing arm 31 generally in an "I" shape. The connecting crossbar 312 can increase the structural rigidity of the swing arm 31 and ensure that the two arms 311 move synchronously, thereby ensuring that the two blade drive members 23 rise and fall synchronously.

[0051] In this embodiment, the lifting and limiting device 30 may further include a lifting drive assembly (not shown in the figure) for driving the cutter head 20 to lift. The lifting drive assembly may be installed on the vehicle body 10 and connected to the swing arm 31 or the cutter head 20 via a transmission connection.

[0052] In some embodiments, the output end of the lifting drive assembly can be connected to the swing arm 31, thereby driving the cutter head 20 to rise and fall by rotating the swing arm 31 relative to the vehicle body 10. For example, the lifting drive assembly may include a rotary motor (not shown in the figure), which drives the swing arm 31 to rotate relative to the vehicle body 10. Optionally, one end of the swing arm 31 is fixedly connected to a rotating shaft 33, which is rotatably mounted on the vehicle body 10. The output end of the rotary motor is connected to the rotating shaft 33, thereby driving the swing arm 31 to rotate relative to the vehicle body 10 through the rotating shaft 33, and thus driving the cutter head 20 to rise and fall.

[0053] In other embodiments, the output end of the lifting drive assembly is connected to the cutter head 20, thereby directly driving the cutter head 20 to rise and fall. In this case, the swing arm 31 can guide the movement trajectory of the cutter head 20. For example, the lifting drive assembly can also adopt a winch structure (not shown in the figure) and include a rotating shaft, a guide wheel, and a suspension rope. One end of the suspension rope is suspended from the cutter head 20 through the guide wheel, applying an upward pulling force to the cutter head 20. The other end of the suspension rope is wound around the rotating shaft, and the release length of the suspension rope can be adjusted by rotating the rotating shaft, thereby adjusting the height at which the suspension rope lifts the cutter head 20.

[0054] The lifting rope can also be connected to the swing arm 31, and the cutter head 20 can be indirectly lifted by applying tension to the swing arm 31.

[0055] In other embodiments, the lifting drive assembly may take other forms, such as a cam.

[0056] The lifting drive component can be omitted, in which case the lifting of the blade 20 of the lawn mower 100 can be adjusted by a person.

[0057] In this embodiment, the number of swing arms 31 can be one or more.

[0058] Combination Figures 1-4 There are two swing arms 31, which are arranged parallel to each other along the height direction Z of the mowing equipment 100. The cutter head 20, the vehicle body 10, and the two swing arms 31 are connected to form a parallel four-bar linkage. Based on the properties of the parallel four-bar linkage, when the two swing arms 31 rotate, they can drive the cutter head 20 to rise and fall vertically along the height direction Z of the vehicle body 10, and the cutter head 20 will not deflect relative to the height direction Z of the vehicle body 10 during the rising and falling process, ensuring that the bottom surface P1 of the cutter head 20 remains horizontal (i.e., perpendicular to the height direction Z of the mowing equipment 100).

[0059] The limiting structure 32 of this embodiment is described below as an example.

[0060] Figures 1-4 In the middle, the blade 20 of the lawn mowing device 100 is in the upper limit position. Figure 5 In the middle, the blade 20 of the lawn mowing device 100 is in the lower limit position.

[0061] In this embodiment, the limiting structure 32 of the lifting limit device 30 can be located on the swing arm 31, on the vehicle body 10, or simultaneously on both the swing arm 31 and the vehicle body 10. When the cutter head 20 descends to the lower limit position (see... Figure 5 The limiting structure 32 can restrict the rotation of the swing arm 31, thereby preventing the cutter head 20 from going down to the lower limit position and hitting the ground or protruding objects on the ground (such as stones), which can reduce the possibility of damage to the cutter head 20, the lifting drive assembly, the lawn or other safety problems.

[0062] The two arms 311 on both sides of the swing arm 31 can be equipped with limiting structures 32 at the same time, so that the two sides of the swing arm 31 can respectively abut against the vehicle body 10 through the limiting structures 32, ensuring that the swing arm 31 is reliably and balancedly supported by the vehicle body 10.

[0063] The limiting structure 32 includes a first limiting part 321 and a second limiting part 14. The first limiting part 321 is connected to the swing arm 31, and the second limiting part 14 is connected to the vehicle body 10. When the cutter head 20 is in the lower limit position, the first limiting part 321 abuts against the second limiting part 14.

[0064] For example, the second limiting part 14 is a protrusion that protrudes from the side of the vehicle body 10 (also seen in...). Figure 1 The first limiting part 321 is located at one end of the swing arm 31 connected to the vehicle body 10. When the cutter head 20 is above the lower limit position, the first limiting part 321 and the second limiting part 14 are spaced apart from each other. When the cutter head 20 descends to the lower limit position, the first limiting part 321 just abuts against the second limiting part 14 on the vehicle body 10. Thus, the swing arm 31 cannot continue to rotate relative to the vehicle body 10, thereby preventing the cutter head 20 from continuing to descend with the rotation of the swing arm 31. Of course, when the cutter head 20 is at the lower limit position, it can move upward under the drive of the lifting drive assembly.

[0065] In one possible implementation, the first limiting part 321 extends downward relative to the swing arm 31 and connects with the swing arm 31 to form an angle (e.g., a right angle). The rotation center of the swing arm 31 relative to the vehicle body 10 is located in the angle region between the first limiting part 321 and the swing arm 31. The surface of the first limiting part 321 facing away from the swing arm 31 is the limiting surface P2. When the cutter head 20 is in the lower limit position, the limiting surface P2 abuts against the vehicle body 10.

[0066] Optionally, the first limiting part 321 is roughly triangular in shape, with the end of the first limiting part 321 closer to the swing arm 31 being wider and the end further away from the swing arm 31 being more pointed.

[0067] In other embodiments, the second limiting part 14 is not required on the vehicle body 10. In this case, when the cutter head 20 is at its lower limit position, the first limiting part 321 directly abuts against the vehicle body 10 itself. In this embodiment, the abutment of the first limiting part 321 and the vehicle body 10 can also limit the cutter head 20 from descending beyond the lower limit position, effectively reducing the risk of the cutter head 20 dragging on the ground and causing damage or other safety risks.

[0068] In other embodiments, the first limiting part 321 is not required on the swing arm 31. In this case, when the cutter head 20 is at its lower limit position, the swing arm 31 directly abuts against the vehicle body 10 or the second limiting part 14 on the vehicle body 10. In this embodiment, the abutment of the swing arm 31 and the vehicle body 10 or the second limiting part 14 on the vehicle body can also limit the downward movement of the cutter head 20 beyond the lower limit position, effectively reducing the risk of the cutter head 20 dragging on the ground and causing damage or other safety risks.

[0069] Furthermore, in the case where two swing arms 31 are provided, the limiting structure 32 can be provided on the upper swing arm 31 (see Figure 5 ), or it can be set in the lower swing arm 31 (see Figure 6 The limiting structure 32 can also be provided on both the upper swing arm 31 and the lower swing arm 31.

[0070] Figure 7 A lawn mowing device 100 employing a different form of the first limiting part 321 is shown. Figure 7 In the middle, the blade 20 of the lawn mowing device 100 is in the upper limit position. Figure 8 for Figure 7 A schematic diagram of the cutter head 20 of the grass mower 100 in its lower limit position.

[0071] See Figure 7 and Figure 8 In this lawn mowing device 100, the vehicle body 10 has a bottom surface P1. The limiting structure 32 includes a limiting member 322, which is connected to the end of the swing arm 31 near the cutter head 20 along the height direction Z of the lawn mowing device 100, and the limiting member 322 protrudes downward from the bottom surface P1. The vehicle body 10 is located on the rotation path of the limiting member 322, and when the cutter head 20 rotates with the swing arm 31 to the lower limit position (see... Figure 8 The limiting member 322 abuts against the vehicle body 10. In this lawn mowing device 100, the limiting member 322 is located at the end of the swing arm 31 connected to the vehicle body 10 along the Z-direction of height.

[0072] Optionally, the car body 10 is provided with a recess C1 that is recessed from the bottom surface P1. The limiting member 322 protrudes from the recess C1. When the cutter head 20 is not in the lower limit position (see...), Figure 7 There is a gap f1 between the side of the groove C1 and the limiting member 322. When the cutter head 20 moves to the lower limit position (see...) Figure 8 The limiting member 322 abuts against the side of the groove C1 to restrict the cutter head 20 from continuing to descend.

[0073] See you again Figure 7Optionally, when the cutter head 20 is at its upper limit position, the cutter head 20 can abut against the limiting member 322 in the horizontal direction to limit the horizontal displacement of the cutter head 20 at the upper limit position. The horizontal direction referred to here means any direction perpendicular to the height direction Z of the mowing device 100; that is, the horizontal direction can be the front-back direction X, the width direction Y (or the left-right direction) of the mowing device 100, or a direction sandwiched between the front-back direction X and the width direction Y. The abutment referred to here means that the limiting member 322 can directly abut against the cutter head 20, or there can be a certain distance (e.g., less than 1 mm) between the limiting member 322 and the cutter head 20 in the horizontal direction, allowing the cutter head 20 a certain horizontal displacement margin before abutting against the limiting member 322.

[0074] Figure 7 In this embodiment, the limiting member 322 abuts against the rear of the cutter head 20, thereby restricting the rearward displacement of the cutter head 20. In other embodiments, the limiting member 322 may also abut against the front, sides, or other corners of the cutter head 20, which is not limited here.

[0075] Optionally, the swing arm 31 can adopt Figure 3 The form shown includes two arms 311, both of which can be connected to a limit member 322. See also... Figure 9 Two limiting members 322, spaced Y apart along the width direction of the mowing equipment 100, respectively limit different positions behind the cutter head 20.

[0076] See also Figure 9 The limiting structure 32 also includes a third limiting part 323. The third limiting part 323 is provided on the vehicle body 10. Optionally, the third limiting part 323 is columnar and protrudes downward from the bottom surface P1 of the vehicle body 10.

[0077] When the cutter head 20 is at the set upper limit position, the cutter head 20 can abut against the third limiting part 323 in the horizontal direction. The term "abut" here means that the cutter head 20 can directly abut against the third limiting part 323, and the third limiting part 323 can also have a certain distance from the cutter head 20 in the horizontal direction, so that the cutter head 20 can have a certain horizontal displacement margin, and then abut against the third limiting part 323 after exceeding the margin.

[0078] Optionally, there are two third limiting parts 323. When the cutter head 20 is at the set upper limit position, the two third limiting parts 323 abut against the front of the cutter head 20 at intervals along the width direction Y of the mowing device 100. Thus, when the cutter head 20 is at the set upper limit position, the two third limiting parts 323 and the two limiting members 322 form a four-corner limit on the cutter head 20, ensuring that the cutter head 20 can maintain a stable position and is not easily shifted in the horizontal direction. Therefore, when the bottom of the cutter head 20 touches a stone or a protrusion on the ground, even if the cutter head 20 is subjected to forward or backward forces, it will not move forward or backward, causing damage to the cutter head 20 and the swing arm 31, thus improving the stability of the cutter head 20.

[0079] Optionally, the cutter head 20 has a relief opening K1 with a shape adapted to the third limiting part 323 at the corresponding third limiting part 323. The purpose of the relief opening K1 is to allow the third limiting part 323 to be positioned closer to the cutter head 20, making the structure of the mowing device 100 more compact.

[0080] Optionally, this embodiment can also limit the thickness of the third limiting part 323 and the limiting member 322. Since the edge of the cutter head 20 is usually made of elastic materials such as plastic, it will bend and deform upward when subjected to a large lifting force. The cutter head 20 can be bent and deformed before being limited by the third limiting part 323 and the limiting member 322. In this way, the size of the third limiting part 323 and the limiting member 322 can be made smaller, making the structure of the lawn mowing device 100 more compact.

[0081] See Figure 10 In one possible implementation, the limiting structure 32 further includes a sensing element 324 and a sensed element 325. The sensing element 324 is disposed on the vehicle body 10, and the sensed element 325 is disposed on the cutter head 20. When the cutter head 20 is located at a set upper limit position, the sensing element 324 can sense the sensed element 325 and generate a sensing signal. The sensing signal is used to instruct the lawn mowing device 100 to stop moving and / or to instruct the cutter head 20 to stop rotating. Optionally, the sensed element 325 may be a magnet, and the sensing element 324 may be a Hall sensor.

[0082] In other embodiments, the sensing element 324 may also be a proximity sensor, a photoelectric sensor, or other types of sensor, which are not limited herein.

[0083] Thus, during the mowing process, if the mowing equipment 100 encounters a large obstacle such as a rock and pushes the blade 20 to its upper limit position, the sensing element 325 will trigger the sensing element 324 to generate a sensing signal. This sensing signal can trigger an alarm and control the mowing equipment 100 to stop moving forward and stop the blade 20 from rotating, preventing it from continuing forward and causing the conductor to hit a rock and break off on the lawn, thereby ensuring safety during use.

[0084] In addition, to prevent the cutter head 20 from dragging on the ground, an alarm can be triggered by a sensor when the cutter head 20 exceeds the lower limit position.

[0085] The above embodiments are only used to illustrate the technical solutions of this application and are not intended to limit it. Although this application has been described in detail with reference to the above preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions to the technical solutions of this application should not depart from the spirit and scope of the technical solutions of this application.

Claims

1. A lifting and limiting device for lawn mowing equipment, characterized in that, The lifting and limiting device includes: A swing arm, one end of which is rotatably connected to the body of the lawnmower and capable of rotating relative to the body; the other end of which is connected to the cutter head of the lawnmower, for driving the cutter head to rise and fall relative to the body; and, A limiting structure is provided on the swing arm and / or the vehicle body. When the cutter head descends to a set lower limit position, the limiting structure can restrict the rotation of the swing arm.

2. The lifting and limiting device according to claim 1, characterized in that: The limiting structure includes a first limiting part; The first limiting part is connected to the swing arm; When the cutter head is at the lower limit position, the first limiting part abuts against the vehicle body.

3. The lifting and limiting device according to claim 2, characterized in that: The first limiting part and the swing arm are connected to form an angle. The rotation center of the swing arm relative to the vehicle body is located in the angle region between the first limiting part and the swing arm. The surface of the first limiting part away from the swing arm is a limiting surface. When the cutter head is at the lower limit position, the limiting surface abuts against the vehicle body.

4. The lifting and limiting device according to claim 1, characterized in that: The vehicle body has a bottom surface, and the limiting structure includes a limiting member. The limiting member is connected to one end of the swing arm near the cutter head along the height direction of the mowing equipment, and the limiting member protrudes downward from the bottom surface. The vehicle body is located on the rotation path of the limiting member, and when the cutter head rotates with the swing arm to the lower limit position, the limiting member abuts against the vehicle body.

5. The lifting and limiting device according to claim 4, characterized in that: When the cutter head is at the set upper limit position, the cutter head can abut against the limiting member in the horizontal direction.

6. The lifting and limiting device according to claim 4, characterized in that: The vehicle body is provided with a groove recessed from the bottom surface; The limiting member protrudes from the groove; When the cutter head is not at the lower limit position, there is a gap between the side of the groove and the limiting member; When the cutter head moves to the lower limit position, the limiting member abuts against the side of the groove to restrict the cutter head from continuing to move downward.

7. The lifting and limiting device according to any one of claims 1-6, characterized in that: There are two swing arms, which are arranged in parallel and spaced apart; the cutter head, the car body and the two swing arms are connected to form a parallel four-bar linkage mechanism; One of the two swing arms is provided with the limiting structure, or both of the two swing arms are provided with the limiting structure.

8. The lifting and limiting device according to claim 1, characterized in that: The limiting structure includes a second limiting part; The second limiting part is connected to the vehicle body; When the cutter head is at the lower limit position, the swing arm abuts against the second limiting part.

9. The lifting and limiting device according to claim 1, characterized in that: The limiting structure includes a first limiting part and a second limiting part; The first limiting part is connected to the swing arm, and the second limiting part is connected to the vehicle body; When the cutter head is at the lower limit position, the first limiting part abuts against the second limiting part.

10. The lifting and limiting device according to any one of claims 1-6, characterized in that: The limiting structure also includes a third limiting part; The third limiting part is provided on the vehicle body; When the cutter head is at the set upper limit position, the cutter head can abut against the third limiting part in the horizontal direction.

11. The lifting and limiting device according to any one of claims 1-6, characterized in that: The limiting structure also includes a sensing element and a sensed component; The sensing element is disposed on the vehicle body, and the sensing element is disposed on the cutter head; When the cutter head is at the set upper limit position, the sensing element can sense the sensed object and generate a sensing signal; the sensing signal is used to instruct the mowing device to stop moving and / or instruct the cutter head to stop rotating.

12. A lawn mowing device, characterized in that, include: Vehicle body; Cutterhead; as well as, The lifting and limiting device according to any one of claims 1-11; The swing arm is connected between the cutter head and the vehicle body.

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