Guard device and mobile mowing device

Abstract

The application provides a protection device and a mobile mowing equipment. The protection device comprises a connecting piece, a protection piece, a first fixing module and a second fixing module. The connecting piece comprises a free end and a connecting end. The protection piece is fixedly connected to the free end. The first fixing module is connected to the connecting end. The second fixing module is connected to the connecting end and is located on the side of the first fixing module away from the protection piece. The first fixing module and the second fixing module are respectively used for fixing the connecting end to the mobile mowing equipment. The fixing strength between the first fixing module and the mobile mowing equipment is greater than the fixing strength between the second fixing module and the mobile mowing equipment. By increasing the fixing strength of the first fixing module, the bearing capacity of the position on the connecting end close to the protection piece to external force can be improved, the connection failure risk between the first fixing module and the connecting piece can be reduced, the damage risk of the first fixing module can be reduced, and the risk of the connecting piece and the protection piece falling off can be reduced.

Description

Technical Field

[0001] This application relates to the field of lawn mowing robot technology, and more particularly to a protective device and a mobile lawn mowing equipment. Background Technology

[0002] When a lawnmower is working, it cuts and trims the lawn by the high-speed rotation of its cutting disc. To prevent the user's body from coming into contact with the cutting disc, a protective device is usually installed on the chassis of the lawnmower to prevent the user's body from reaching into the bottom of the chassis. However, in traditional lawnmowers, the protective device is usually simply fixed to the bottom of the chassis. During the operation of the lawnmower, the protective device frequently comes into contact with and collides with external objects, causing the stress at the connection between the protective device and the lawnmower to change constantly. After prolonged use, the protective device is prone to detachment. Utility Model Content

[0003] This application provides a protective device and a mobile lawn mowing device to solve the problem of the protective device easily falling off.

[0004] In a first aspect, this application provides a protective device, comprising a connector, a protective member, a first fixing module, and a second fixing module. The connector includes a free end and a connecting end. The protective member is fixedly connected to the free end. The first fixing module is connected to the connecting end. The second fixing module is connected to the connecting end and is located on the side of the first fixing module away from the protective member. The first fixing module and the second fixing module are respectively used to fix the connecting end to a mobile lawnmower, and the fixing strength between the first fixing module and the mobile lawnmower is greater than the fixing strength between the second fixing module and the mobile lawnmower.

[0005] In some embodiments, the fastening force between the first fixed module and the mobile mowing device is greater than the fastening force between the second fixed module and the mobile mowing device, and / or, the shear strength of the first fixed module is greater than the shear strength of the second fixed module.

[0006] In some embodiments, the first fixing module includes at least two first fixing members, the second fixing module includes at least one second fixing member, and the number of the first fixing members is greater than the number of the second fixing members.

[0007] In some embodiments, the first fixing member and the second fixing member are respectively provided as a plurality, and the arrangement density of the plurality of first fixing members is greater than the arrangement density of the plurality of second fixing members.

[0008] In some embodiments, the connector is used to connect to the cutting device of the mobile lawnmower, and the minimum ground clearance of the protective member is less than the minimum ground clearance of the cutting device.

[0009] In some embodiments, the connector is used to connect with the cutting device of the mobile lawn mower, the connecting end is provided with a mounting hole, and the connector is provided with a first step portion in the mounting hole, the first step portion being used to install the cutting device.

[0010] In some embodiments, the mobile lawn mower further includes a seal that is sealed between the cutting device and the chassis of the mobile lawn mower. The seal includes a retractable pleated portion. The connector also has a second step portion in the mounting hole. The second step portion is located on the side of the first step portion near the chassis and is used to support the pleated portion.

[0011] In some embodiments, the protective device further includes a reinforcing member located on the side of the connector away from the mobile lawnmower, and the first fixing module and the second fixing module are respectively used to press the reinforcing member against the connector.

[0012] Secondly, this application provides a mobile lawn mowing device, which includes a chassis, a cutting device, and a protective device as described in any one of the above. The cutting device is mounted on the chassis, and the protective device is located on the side of the chassis closest to the ground and is disposed near the edge of the chassis.

[0013] In some embodiments, the cutting device includes a drive member and a cutting disc, the drive member being fixedly connected to the cutting disc, a protective device being located between the cutting disc and the chassis, the protective device having a first extension on the side facing the cutting disc, and the cutting disc having a second extension on the side facing the chassis, the first extension and the second extension being at least partially overlapping along the height direction of the mobile mowing device.

[0014] In some embodiments, the first extension and the second extension are respectively arranged in a ring, and one of the first extension and the second extension is sleeved outside the other of the first extension and the second extension.

[0015] In some embodiments, the cutting device further includes a cutting element and a cutter head guard plate, the cutter head guard plate being connected to the side of the cutting cutter head away from the chassis, and the cutting element being connected to the cutter head and located between the cutting cutter head and the cutter head guard plate.

[0016] In some embodiments, the protective device is fixedly connected to the chassis; or, the protective device is fixedly connected to the cutting device, and the cutting device is adjustable in height relative to the chassis.

[0017] In some embodiments, the chassis is provided with a receiving groove, and when the cutting device is at its maximum ground clearance, the protective device is located in the receiving groove, and the minimum ground clearance of the protective device is greater than or equal to the minimum ground clearance of the chassis.

[0018] In some embodiments, the mobile lawn mower further includes a side guard plate fixedly connected to the chassis and located on the side of the protective device away from the center of the chassis.

[0019] In the protective device and mobile lawn mower provided in this application, the protective component is fixedly connected to the free end, and the first fixing module and the second fixing module are respectively connected to the connecting end and are used to fix the connecting end to the mobile lawn mower. The second fixing module is located on the side of the first fixing module away from the protective component. The fixing strength between the first fixing module and the mobile lawn mower is greater than the fixing strength between the second fixing module and the mobile lawn mower. On the one hand, by increasing the fixing strength of the first fixing module, the bearing capacity of the connecting end near the protective component to external forces can be improved, reducing the risk of connection failure between the first fixing module and the connecting end, and reducing the risk of damage to the first fixing module, thereby reducing the risk of the connecting component and the protective component falling off relative to the mobile lawn mower. On the other hand, the fixing strength of the first fixing module and the second fixing module is matched with the force they bear, improving the consistency of the service life of the first fixing module and the second fixing module, balancing the force differences at different positions of the connecting component, improving the connection stability at various positions of the connecting component, reducing the risk of local connection failure of the connecting component, and avoiding the cost waste caused by simultaneously increasing the fixing strength of the first fixing module and the second fixing module. Attached Figure Description

[0020] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0021] Figure 1 This is a side view of the mobile lawnmower provided in the embodiments of this application.

[0022] Figure 2 This is a cross-sectional view of the mobile lawnmower provided in the embodiments of this application.

[0023] Figure 3 This is a schematic diagram of the protective device provided in the embodiments of this application from one perspective.

[0024] Figure 4 This is a schematic diagram of the protective device provided in the embodiments of this application from another perspective.

[0025] Figure 5 This is a cross-sectional view of the cutting device and protective device provided in the embodiments of this application.

[0026] Figure 6 This is a schematic diagram of the structure of the cutting disc, cutting component, and disc guard plate provided in the embodiments of this application.

[0027] Figure 7 This is an exploded view of the cutting disc, cutting component, and disc guard plate provided in the embodiments of this application.

[0028] Key reference numerals in the drawings: Mobile lawn mower 100; Chassis 10; Receiving groove 101; Mounting groove 102; Cutting device 20; Drive component 21; Output shaft 211; Connecting part 212; Cutting blade 22; Second extension 221; Third extension 222; Cutting component 23; Blade guard plate 24; Lifting mechanism 25; Mounting cylinder 251; Protective device 30; Connecting component 31; Free end 3101; Connecting end 3102; Mounting hole 311; Hollow hole 312; First step 313; Second step 314; First extension 315; Protective component 32; Bottom guard plate 321; Side guard plate 322; First fixing module 33; First fixing component 331; Second fixing module 34; Second fixing component 341; Reinforcing component 35; Sealing component 41; Pleated part 411; Side guard plate 42; Walking wheel 50.

[0029] The following detailed description, in conjunction with the accompanying drawings, will further illustrate this application. Detailed Implementation

[0030] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of the embodiments. Based on the embodiments of this application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this application.

[0031] In this document, references to "embodiment" or "implementation" mean that a particular feature, structure, or characteristic described in connection with an embodiment or implementation may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0032] It should be noted that the terminology in the specification, claims, and accompanying drawings of this application is for describing specific embodiments only and is not intended to limit this application. The terms "first," "second," etc., in the specification, claims, and accompanying drawings of this application are used to distinguish different objects, not to describe a specific order. The term "and / or" as used in this application refers to any combination and all possible combinations of one or more of the associated listed items, and includes such combinations.

[0033] Please refer to the following: Figure 1 and Figure 2 , Figure 1 This is a side view of the mobile lawnmower 100 provided in an embodiment of this application. Figure 2 This is a cross-sectional view of a mobile lawn mower 100 provided in an embodiment of this application. The mobile lawn mower 100 includes a chassis 10, a cutting device 20, and a protective device 30 as described in any embodiment of this application. The cutting device 20 is mounted on the chassis 10. The protective device 30 is located on the side of the chassis 10 closest to the ground and is disposed near the edge of the chassis 10. The protective device 30 is used to protect the mobile lawn mower 100, preventing user body parts from extending into the bottom of the chassis 10 and contacting the cutting device 20, thereby preventing safety accidents, and preventing the cutting device 20 from contacting obstacles or the ground. The mobile lawn mower 100 also includes wheels 50 mounted on the edge of the chassis 10. The mobile lawn mower 100 is used to drive the wheels 50 to rotate, thereby moving the mobile lawn mower 100 relative to the ground.

[0034] In traditional lawnmowers, the protective device is typically simply fixed to the bottom of the chassis. During operation, this device frequently comes into contact with and collides with external objects (such as grass, ground, branches, and stones), causing constant changes in the force at the connection point between the device and the robot. Specifically, when the device collides with an object, the force is greater near the edge of the chassis than near the center, making this area prone to connection failure. After prolonged use, the protective device is susceptible to detachment due to connection failure.

[0035] Please refer to the following: Figure 2 , Figure 3 , Figure 4 and Figure 5 , Figure 3 This is a schematic diagram of the protective device 30 provided in the embodiments of this application from one perspective. Figure 4 This is a schematic diagram of the protective device 30 provided in an embodiment of this application from another perspective. Figure 5This is a cross-sectional view of the cutting device 20 and the protective device 30 provided in the embodiments of this application. In the embodiments of this application, the protective device 30 includes a connector 31, a protective member 32, a first fixing module 33, and a second fixing module 34. The connector 31 includes a free end 3101 and a connecting end 3102. The free end 3101 and the connecting end 3102 are disposed opposite to each other along the extending direction of the connector 31 and are disposed close to the two ends of the connector 31 along the extending direction. The protective member 32 is disposed on the free end 3101. The first fixing module 33 is connected to the connecting end 3102 and is spaced apart from the protective member 32. The second fixing module 34 is connected to the connecting end 3102 and is spaced apart from the protective member 32, and is located on the side of the first fixing module 33 away from the protective member 32. The first fixing module 33 and the second fixing module 34 are respectively used to fix the connecting end 3102 to the mobile lawn mowing device 100. The fixing strength between the first fixed module 33 and the mobile lawn mower 100 is greater than that between the second fixed module 34 and the mobile lawn mower 100. In this embodiment, on the one hand, during frequent contact between the protective component 32 and external objects, the force exerted by the external object on the protective component 32 is transmitted from the free end 3101 to the connecting end 3102. The force exerted on the connecting end 3102 near the protective component 32 is greater than that at the location farther from the protective component 32, and the force changes more frequently. By increasing the fixing strength of the first fixed module 33, the ability of the connecting end 3102 near the protective component 32 to withstand external forces can be improved, reducing the risk of connection failure between the first fixed module 33 and the connecting end 3102, reducing the risk of damage to the first fixed module 33, and reducing the risk of the connecting component 31 and the protective component 32 detaching from the mobile lawn mower 100. On the other hand, the first fixed module... The fixing strength of the first fixing module 33 and the second fixing module 34 is matched with the force they bear, which improves the consistency of the service life of the first fixing module 33 and the second fixing module 34, balances the force difference at different positions of the connector 31, improves the connection stability at various positions of the connector 31, reduces the risk of local connection failure of the connector 31, and avoids the cost waste caused by simultaneously increasing the fixing strength of the first fixing module 33 and the second fixing module 34. On the other hand, the protective and blocking function of the protective component 32 can prevent the user's body parts (such as hands, legs, etc.) from contacting the cutting device 20 of the mobile lawn mower 100, protecting the user from injury, and blocking obstacles (such as branches, stones, etc.) to prevent the cutting device 20 from colliding with obstacles and being damaged.

[0036] The connector 31 extends along the width direction of the mobile mower 100 (perpendicular to the travel and height directions of the mobile mower 100). A protective member 32 is located at the end of the connector 31 near the edge of the chassis 10. The protective member 32 extends along the length direction (travel direction) and height direction of the mobile mower 100. The protective member 32 includes a bottom guard plate 321 and several side guard plates 322 connected to the bottom guard plate 321. The bottom guard plate 321 is fixedly connected to the free end 3101 and is located on the side of the connecting end 3101 away from the chassis 10. The several side guard plates 322 are bent relative to the bottom guard plate 321 towards the chassis 10. There can be three side guard plates 322 arranged in a C-shape to improve the side protection of the cutting disc 22 of the cutting device 20 near the edge of the chassis 10. One of the three side guards 322 is connected to the bottom guard 321 on one side near the edge of the chassis 10 along the width direction of the mobile mower 100, and the other two side guards 322 are connected to the front and rear sides of the bottom guard 321 along the travel direction of the mobile mower 100.

[0037] In this application, the fixing strength of the first fixing module 33 and the fixing strength of the second fixing module 34 are positively correlated with the degree of firmness of the connection between the connecting end 3102 and the mobile lawn mower 100 after the first fixing module 33 and the second fixing module 34 are connected and fixed to the mobile lawn mower 100. The greater the fixing strength of the first fixing module 33 and the second fixing module 34, the more firmly the connection between the connector 31 and the mobile lawn mower 100 is maintained, the less likely the first fixing module 33 and the second fixing module 34 are to loosen or fall off, and the less likely the connector 31 is to fall off. The fixing strength of the first fixing module 33 can be characterized as the fastening force and / or shear strength of the first fixing module 33, and the fixing strength of the second fixing module 34 can be characterized as the fastening force and / or shear strength of the second fixing module 34.

[0038] In some embodiments, the fastening force between the first fixing module 33 and the mobile mowing device 100 is greater than the fastening force between the second fixing module 34 and the mobile mowing device 100. The greater fastening force between the first fixing module 33 and the mobile mowing device 100 ensures a tighter connection between the connecting end 3102 near the protective member 32 and the mobile mowing device 100. This makes the first fixing module 33 less prone to loosening under external forces, ensuring a stable connection even after prolonged use of the mobile mowing device 100. This prevents the connecting member 31 from detaching from the mobile mowing device 100.

[0039] In some embodiments, the shear strength of the first fixed module 33 is greater than that of the second fixed module 34. During the movement of the mobile lawnmower 100, when the protective member 32 collides with an obstacle on the path, the external force generated by the collision exerts a shearing effect on the first fixed module 33 and the second fixed module 34 through the protective member 32 and the connecting member 31. Furthermore, the deformation displacement at the connecting end 3102 near the protective member 32 is greater, resulting in a greater shear force exerted by the connecting member 31 on the first fixed module 33 than on the second fixed module 34. In this embodiment, the greater shear strength of the first fixed module 33 ensures that the shear force exerted by the first fixed module 33 on the first fixed module 33 is greater than that exerted on the second fixed module 34. It can withstand greater shear forces, reduce the risk of cracking and breakage of the first fixing module 33 under shear forces, and improve the fatigue life of the first fixing module 33. Thus, after the mobile lawn mower 100 has been used for a long time, the first fixing module 33 can still keep the connector 31 firmly connected to the mobile lawn mower 100, thereby avoiding the problem of the connector 31 falling off relative to the mobile lawn mower 100, extending the service life of the protective device 30, and matching the shear strength of the first fixing module 33 and the second fixing module 34 with the shear forces they are subjected to, thereby reducing cost waste.

[0040] In some embodiments, the fastening force between the first fixed module 33 and the mobile mowing device 100 is greater than the fastening force between the second fixed module 34 and the mobile mowing device 100, and the shear strength of the first fixed module 33 is greater than the shear strength of the second fixed module 34, so as to improve the ability of the connection end 3102 near the protective member 32 to withstand external forces, reduce the risk of loosening or breaking of the first fixed module 33, and enable the connector 31 to maintain a stable connection with the mobile mowing device 100 for a long time.

[0041] The first fixing module 33 includes at least two first fixing members 331. The second fixing module 34 includes at least one second fixing member 341. The number of first fixing members 331 is greater than the number of second fixing members 341, so that the overall fastening force provided by the multiple first fixing members 331 to the connector 31 is greater than the fastening force provided by the second fixing members 341 to the connector 31. This results in a greater connection strength between the connecting end 3102 at the position corresponding to the first fixing module 33 and the mobile lawn mower 100, thereby improving the ability of the connecting end 3102 at the position corresponding to the first fixing module 33 to resist external impact, balancing the force differences at different positions of the connecting end 3102, and reducing the risk of connection failure of the connector 31. The number of first fixing members 331 and second fixing members 341 can be specifically set according to actual needs, and this application does not impose specific limitations. For example, in this embodiment, the number of first fixing members 331 is set to 4, and the number of second fixing members 341 is set to 2. In some embodiments, the number of first fasteners 331 may be 5, 6, etc., and the number of second fasteners 341 may be 3, 4, etc.

[0042] In some embodiments, multiple first fixing members 331 and second fixing members 341 are provided, and the arrangement density of the multiple first fixing members 331 is greater than the arrangement density of the multiple second fixing members 341. Thus, more first fixing members 331 can be provided within the same installation area, thereby providing more support for the connector 31, which helps to maintain a stable connection between the connector 31 and the mobile lawnmower 100. Furthermore, the first fixing members 331 do not need to occupy the installation space of the second fixing members 341, i.e., the installation area of ​​the second fixing members 341 does not need to be reduced, ensuring that the second fixing module 34 has sufficient installation area, making the structural design of the protective device 30 reasonable. The first fixing members 331 and second fixing members 341 can be configured as bolts. In some embodiments, the first fixing members 331 and second fixing members 341 can also be configured as other components, such as screws, pins, etc.

[0043] In some embodiments, the protective device 30 further includes a reinforcing member 35. The reinforcing member 35 is located on the side of the connector 31 away from the mobile lawnmower 100. The first fixing module 33 and the second fixing module 34 are respectively used to press the reinforcing member 35 against the connecting end 3102 of the connector 31. The reinforcing member 35 is used to average the pressure exerted on the connecting end 3102 by the plurality of first fixing members 331 and the plurality of second fixing members 341, increase the contact area between the first fixing members 331, the second fixing members 341 and the connecting end 3102, reduce the stress at the contact point between the first fixing members 331, the second fixing members 341 and the connecting end 3102, and distribute the external force to the plurality of first fixing members 331 and the plurality of second fixing members 341 when the connector 31 is subjected to external force, so as to avoid the connection 31 from being damaged due to local stress concentration. The connecting end 3102 is provided with a mounting hole 311. The cutting device 20 passes through the mounting hole 311. The reinforcing member 35 is arranged in a circular shape. The reinforcing member 35 is arranged around the mounting hole 311.

[0044] In some embodiments, the connector 31 has a perforated hole 312 at a position between the free end 3101 and the connecting end 3102 to reduce the weight of the connector 31 and reduce its manufacturing cost. The perforated hole 312 is located on the side of the mounting hole 311 near the protective member 32, that is, on the side of the mounting hole 311 away from the center of the chassis 10 (the center of the mobile lawnmower 100 along the width direction), to reduce the bending moment of the connector 31 itself on the first fixed module 33 and the second fixed module 34 under the influence of gravity, and to reduce the inertial effect of the connector 31 under the action of external forces, thereby reducing the magnitude of the external forces acting on the first fixed module 33 and the second fixed module 34 and improving the stability of the protective device 30 after installation. The connector 31 is provided with reinforcing ribs to improve the overall bending resistance of the connector 31.

[0045] In this embodiment, the protective component 32 and the connecting component 31 are independently configured. The protective component 32 and the connecting component 31 are fixedly connected together by means of snap-fit, screw connection, or other methods. The protective component 32 and the connecting component 31 are detachably connected. The protective component 32 is connected to the side of the connecting component 31 facing away from the chassis 10. During the operation of the mobile lawnmower 100, the protective component 32 has more frequent contact with the ground, lawn, obstacles, etc., compared to the connecting component 31. Therefore, the wear rate of the protective component 32 is greater than that of the connecting component 31. In this embodiment, the detachable connection between the protective component 32 and the connecting component 31 allows for timely and convenient replacement of the protective component 32 after excessive wear, improving the maintainability of the mobile lawnmower 100 and enhancing the user experience.

[0046] In this embodiment, the connecting end 3102 of the connector 31 is used to be fixedly connected to the cutting device 20 of the mobile lawnmower 100. The protective device 30 is fixedly connected to the cutting device 20 via the connector 31. The minimum ground clearance of the protective device 32 is less than the minimum ground clearance of the cutting device 20. On the one hand, this prevents the user from extending their body part into the bottom of the chassis 10 from the side edge of the mobile lawnmower 100, thus preventing the user's body part from contacting the cutting device 20. On the other hand, when the mobile lawnmower 100 encounters an obstacle, the protective device 32 can preferentially contact the obstacle, thereby pushing the obstacle away or lifting the mobile lawnmower 100, preventing the cutting device 20 from directly colliding with the obstacle and preventing the cutting device 20 from contacting the ground, thereby protecting the cutting device 20 from damage. The protective device 32 is located on the side of the cutting device 20 away from the middle of the chassis 10. The protective device 32 and the connector 31 form an approximately L-shaped structure to protect the side of the cutting device 20 near the edge of the chassis 10.

[0047] The cutting device 20 is height-adjustable relative to the chassis 10. The cutting device 20 is equipped with a lifting mechanism 25, and the body of the mobile lawnmower 100 includes a cooperating mechanism that works with the lifting mechanism 25. The lifting mechanism 25 and the cooperating mechanism work together to raise and lower the cutting device 20 relative to the chassis 10, adjusting the ground clearance of the cutting device 20 and thus the lawn-trimming height. In this embodiment, the cutting device 20 is fixedly connected to the connecting member 31. When the cutting device 20 is raised and lowered relative to the chassis 10, it can also raise and lower the entire protective device 30. This ensures that the minimum ground clearance of the protective member 32 is always less than the minimum ground clearance of the cutting device 20. While ensuring that the protective device 30 always protects the cutting device 20, the height dimensions of the protective member 32 and the connecting member 31 (dimensions along the height direction parallel to the mobile lawnmower 100) do not need to include the lifting stroke of the cutting device 20. This reduces the overall height dimensions of the protective member 32 and the connecting member 31, making the protective device 30 more compact and reducing manufacturing costs.

[0048] The cutting device 20 includes a drive component 21 and a cutting disc 22. An output shaft 211 is mounted on the drive component 21. A connecting portion 212 is mounted on the output shaft 211. The drive component 21 is fixedly connected to the cutting disc 22 via the connecting portion 212 on the output shaft 211. A protective device 30 is located between the cutting disc 22 and the chassis 10. The lifting mechanism 25 is equipped with a mounting cylinder 251, and the drive component 21 is housed within the mounting cylinder 251. The mounting cylinder 251 protects the drive component 21 from damage caused by external contaminants such as grass clippings, water, and sand. A through hole is provided at the bottom of the mounting cylinder 251, through which the output shaft 211 passes. A first fixing module 33 is located on the side of the output shaft 211 closer to the protective device 32 along its central axis, and a second fixing module 34 is located on the side of the output shaft 211 away from the protective device 32 along its central axis.

[0049] The connector 31 has a first step 313 within the mounting hole 311. The first step 313 is used to mount the cutting device 20. The extending direction of the first step 313 is perpendicular to the axial direction of the mounting hole 311. The first step 313 encloses and forms a first mounting space, within which the cutting device 20 is partially disposed. The first step 313 has an annular mounting plane, and the bottom of the mounting cylinder 251 is disposed on the mounting plane. Thus, by providing the first step 313, the connection area between the connector 31 and the cutting device 20 can be increased, the connection stability between the connector 31 and the cutting device 20 can be improved, and the installation difficulty can be reduced.

[0050] In some embodiments, the mobile lawnmower 100 further includes a seal 41. The seal 41 is sealed between the cutting device 20 and the chassis 10 of the mobile lawnmower 100 to prevent external contaminants such as grass clippings, water, and sand from entering the interior of the mobile lawnmower 100 through the gap between the cutting device 20 and the chassis 10. The seal 41 includes a retractable pleated portion 411. When the cutting device 20 is raised or lowered relative to the chassis 10, the pleated portion 411 can extend or retract with the movement of the cutting device 20. One end of the seal 41 is clamped between the mounting cylinder 251 and the first step portion 313, and the other end of the seal 41 is fixedly connected to the chassis 10.

[0051] The connector 31 also has a second step 314 within the mounting hole 311. The second step 314 is located on the side of the first step 313 closest to the chassis 10. The second step 314 is used to support the folded portion 411. When the cutting device 20 rises relative to the chassis 10 (moves away from the ground), at least a portion of the folded portion 411 is accommodated in the second step 314. The second step 314 is annularly arranged and encloses a second mounting space located on the side of the first mounting space closest to the chassis 10. The second mounting space is used to accommodate the folded portion 411, making the structure of the mobile lawnmower 100 more compact. The bottom and side walls of the second step 314 also support the seal 41 when the folded portion 411 is in a folded state, so as to stabilize the position of the seal 41 and avoid interference with other structures.

[0052] In some embodiments, the connector 31 of the protective device 30 may also be fixedly connected to the chassis 10. When the cutting device 20 moves relative to the chassis 10 to the minimum ground clearance, the minimum ground clearance of the protective device 32 is less than the minimum ground clearance of the cutting device 20, so as to protect the cutting device 20 from damage.

[0053] Please refer to the following: Figure 5 , Figure 6 and Figure 7 , Figure 6 This is a schematic diagram of the structure of the cutting disc 22, the cutting component 23, and the disc guard plate 24 provided in the embodiments of this application. Figure 7 This is an exploded view of the cutting disc 22, cutting element 23, and disc guard plate 24 provided in the embodiments of this application. A first extension 315 is provided on the side of the connector 31 of the protective device 30 facing the cutting disc 22. The first extension 315 is provided on the connecting end 3102 and near the mounting hole 311. A second extension 221 is provided on the side of the cutting disc 22 facing the chassis 10. The first extension 315 and the second extension 221 are at least partially overlapping along the height direction of the mobile mowing device 100. The first extension 315 and the second extension 221 are used to jointly protect the connection between the output shaft 211 and the cutting disc 22, reducing or preventing external grass clippings, sand, etc., from eroding the connection between the output shaft 211 and the cutting disc 22, the connection between the output shaft 211 and the drive element 21, and the connection between the connector 31 and the mounting cylinder 251, and increasing the grass-wrapping radius to prevent grass clippings from getting tangled on the cutting disc 22 and hindering its rotation.

[0054] The first extension 315 and the second extension 221 are respectively arranged in a ring shape and surround the mounting hole 311. One of the first extension 315 and the second extension 221 is fitted over the other of the first extension 315 and the second extension 221 to protect all parts of the output shaft 211 in the circumferential direction and improve the protection effect. Exemplarily, in this embodiment, the second extension 221 is fitted over the first extension 315.

[0055] The cutting disc 22 is planar on the side facing the base 10, and a second extension 221 protrudes from the cutting disc 22. The end of the second extension 221 facing away from the cutting disc 22 is wavy. When the cutting disc 22 rotates, debris entering the vicinity of the output shaft 211 can be thrown out from the trough of the second extension 221 under centrifugal force. In some embodiments, the end of the second extension 221 facing away from the cutting disc 22 may also be serrated, planar, etc.

[0056] In some embodiments, the cutting device 20 further includes a cutting element 23 and a cutter head guard plate 24. The cutter head guard plate 24 is fixedly connected to the side of the cutting cutter head 22 facing away from the chassis 10. The cutting element 23 is connected to the cutting cutter head 22 and located between the cutting cutter head 22 and the cutter head guard plate 24. The cutter head guard plate 24 is used to protect the cutting cutter head 22 and the cutting element 23, reduce the direct impact of external objects on the cutting cutter head 22 and the cutting element 23, prevent the cutting cutter head 22 and the cutting element 23 from directly contacting the ground, and block grass clippings, sand, etc., preventing them from entering the center of the cutting cutter head 22, reducing the wear of the cutting element 23 and the cutting cutter head 22, and extending the service life of the cutting cutter head 22 and the cutting element 23. The radius of the cutter head guard plate 24 is approximately the same as the radius of the cutting cutter head 22. The cutter head guard plate 24 can be made of wear-resistant material to improve its impact resistance, wear resistance, and service life. The cutter head guard plate 24 is detachably connected to the cutting cutter head 22 to facilitate maintenance and replacement of the cutter head guard plate 24 after wear.

[0057] The cutting disc 22 has a third extension 222 on the side opposite to the chassis 10. The disc guard 24 has a protrusion that mates with the third extension 222. The third extension 222 is annular. The protrusion passes through the annular cavity formed by the third extension 222. The cutting device 20 also includes fasteners for securing the cutting disc 22, the cutting element 23, and the disc guard 24 together. Compared to separately fixing the cutting disc 22 to the cutting element 23 and to the disc guard 24, using fasteners to secure the cutting disc 22, the cutting element 23, and the disc guard 24 together reduces the number of fasteners, simplifies the structure of the cutting device 20, and reduces manufacturing costs.

[0058] Please refer to the following: Figure 1 and Figure 2 The chassis 10 is provided with a receiving groove 101. When the cutting device 20 is at its maximum ground clearance, the protective device 30 is located within the receiving groove 101. The minimum ground clearance of the protective device 30 is greater than or equal to the minimum ground clearance of the chassis 10. Thus, when the mobile lawnmower 100 moves, it can raise the cutting device 20 to its maximum ground clearance position to prevent the protective device 30 from touching the ground and to reduce the driving resistance of the mobile lawnmower 100 in tall grass environments (environments with high grass blade height), thereby improving the passability of the mobile lawnmower 100. For example, in this embodiment, when the cutting device 20 is at its maximum ground clearance, the minimum ground clearance of the protective device 30 and the minimum ground clearance of the chassis 10 are approximately on the same plane.

[0059] In some embodiments, the chassis 10 is further provided with a mounting groove 102 for at least partially accommodating the connector 31. When the ground clearance of the cutting device 20 is at its maximum value, the connector 31 is located in the mounting groove 102 to increase the lifting stroke of the cutting device 20, thereby increasing the mowing height range of the mobile lawn mower 100 and improving the structural compactness of the mobile lawn mower 100.

[0060] In this embodiment, two cutting devices 20 are provided, arranged at intervals along the width direction of the mobile lawn mower 100. Two protective devices 30 are also provided, corresponding one-to-one with the two cutting devices 20. The two protective devices 30 provide protection for both layers of the chassis 10 along the width direction of the mobile lawn mower 100, effectively preventing the user's body parts from reaching into the bottom of the chassis 10 and coming into contact with the cutting devices 20, thereby ensuring the safety of using the mobile lawn mower 100.

[0061] In some embodiments, the mobile lawnmower 100 further includes a side guard plate 42. The side guard plate 42 is fixedly connected to the chassis 10 and located on the side of the protective device 30 away from the center of the chassis 10. The side guard plate 42 and the protective device 30 work together to protect the cutting device 20, providing double protection for the cutting device 20, thereby effectively preventing the user's body parts from coming into contact with the cutting device 20 and ensuring the safety of using the mobile lawnmower 100.

[0062] The above are merely specific embodiments of this application, but the scope of protection of this application is not limited thereto. Any person skilled in the art can easily conceive of various equivalent modifications or substitutions within the technical scope disclosed in this application, and these modifications or substitutions should all be covered within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A protective device, characterized in that, include: The connector includes a free end and a connecting end; The protective component is disposed on the free end; The first fixed module is connected to the connecting end; The second fixing module is connected to the connecting end and is located on the side of the first fixing module away from the protective component. The first fixing module and the second fixing module are respectively used to fix the connecting end to the mobile mowing device. The fixing strength between the first fixing module and the mobile mowing device is greater than the fixing strength between the second fixing module and the mobile mowing device.

2. The protective device according to claim 1, characterized in that, The fastening force between the first fixed module and the mobile mowing device is greater than the fastening force between the second fixed module and the mobile mowing device, and / or, the shear strength of the first fixed module is greater than the shear strength of the second fixed module.

3. The protective device according to claim 1, characterized in that, The first fixing module includes at least two first fixing members, and the second fixing module includes at least one second fixing member, wherein the number of the first fixing members is greater than the number of the second fixing members.

4. The protective device according to claim 3, characterized in that, The first fixing member and the second fixing member are each configured as a plurality of units, and the arrangement density of the plurality of first fixing members is greater than the arrangement density of the plurality of second fixing members.

5. The protective device according to claim 1, characterized in that, The connector is used to connect to the cutting device of the mobile lawn mower, and the minimum ground clearance of the protective component is less than the minimum ground clearance of the cutting device.

6. The protective device according to claim 1, characterized in that, The connector is used to connect with the cutting device of the mobile lawn mower. The connecting end is provided with a mounting hole, and the connector is provided with a first step in the mounting hole. The first step is used to install the cutting device.

7. The protective device according to claim 6, characterized in that, The mobile lawn mower also includes a seal, which is sealed between the cutting device and the chassis of the mobile lawn mower. The seal includes a retractable pleated portion. The connector also has a second step portion in the mounting hole. The second step portion is located on the side of the first step portion near the chassis and is used to support the pleated portion.

8. The protective device according to claim 1, characterized in that, The protective device also includes a reinforcing member located on the side of the connector away from the mobile mowing device. The first fixing module and the second fixing module are respectively used to press the reinforcing member against the connector.

9. A mobile lawn mowing device, characterized in that, The mobile lawn mowing equipment includes a chassis, a cutting device, and a protective device as described in any one of claims 1-8. The cutting device is mounted on the chassis, and the protective device is located on the side of the chassis closest to the ground and is disposed near the edge of the chassis.

10. The mobile lawnmower according to claim 9, characterized in that, The cutting device includes a drive unit and a cutting disc. The drive unit is fixedly connected to the cutting disc. The protective device is located between the cutting disc and the chassis. The protective device has a first extension on the side facing the cutting disc, and the cutting disc has a second extension on the side facing the chassis. The first extension and the second extension are at least partially overlapping along the height direction of the mobile mowing device.

11. The mobile lawnmower according to claim 10, characterized in that, The first extension and the second extension are respectively arranged in a ring, and one of the first extension and the second extension is sleeved outside the other of the first extension and the second extension.

12. The mobile lawnmower according to claim 10, characterized in that, The cutting device further includes a cutting component and a cutter head guard plate. The cutter head guard plate is connected to the side of the cutting cutter head away from the chassis. The cutting component is connected to the cutting cutter head and located between the cutting cutter head and the cutter head guard plate.

13. The mobile lawnmower according to claim 9, characterized in that, The protective device is fixedly connected to the chassis; or, the protective device is fixedly connected to the cutting device, and the cutting device is adjustable in height relative to the chassis.

14. The mobile lawnmower according to claim 9, characterized in that, The chassis is provided with a receiving groove. When the cutting device is at its maximum ground clearance, the protective device is located in the receiving groove. The minimum ground clearance of the protective device is greater than or equal to the minimum ground clearance of the chassis.

15. The mobile lawnmower according to claim 9, characterized in that, The mobile lawn mower also includes a side guard plate, which is fixedly connected to the chassis and located on the side of the protective device away from the center of the chassis.

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