Mowing device and mower

Abstract

The utility model discloses a kind of grass cutting device and mower, it is related to grass cutting equipment technical field, wherein grass cutting device includes driving element, connecting assembly and grass cutting blade;Driving element includes motor and driving shaft, motor drives driving shaft rotation;Connecting assembly includes motor connecting block and fastening nut;Motor connecting block is sleeved in driving shaft;Fastening nut is screwed in motor connecting block, and located in the side of motor connecting block away from motor;Grass cutting blade is detachably sleeved in fastening nut, and is clamped between fastening nut and motor connecting block;Wherein, the rotation direction of grass cutting blade is same with the rotation direction when fastening nut is tightened.The technical scheme of the utility model aims at reducing the failure rate of mower.

Description

Technical Field

[0001] This utility model relates to the field of grass cutting equipment technology, and in particular to a grass cutting device and a grass cutter. Background Technology

[0002] A lawnmower is a mechanical device specifically designed for trimming lawns, vegetation, etc. It uses rotating blades to cut grass, keeping the lawn neat and beautiful. It is widely used in home gardens, parks, golf courses, football fields, and other places.

[0003] Existing lawnmowers generally use a rigid connection method to fix the blades to the drive shaft of the drive unit. For example, two screws are used on each side of the blade connection hole to directly lock the blades to the output shaft of the motor.

[0004] While this structure is easy to assemble and disassemble, when the blades rotate at high speed and come into contact with stones or other hard objects, the instantaneous reverse impact torque will be directly transmitted axially to precision components such as the motor reduction mechanism, bearings, and control boards. This can easily cause gear breakage, bearing jamming, Hall element failure, or control chip solder joint cracking, resulting in a high failure rate for lawnmowers. Utility Model Content

[0005] The main purpose of this invention is to provide a lawn mowing device and a lawnmower, which aims to reduce the failure rate of lawnmowers.

[0006] To achieve the above objectives, the present invention provides a lawn mowing device comprising: A driving component, comprising a motor and a drive shaft, wherein the motor drives the drive shaft to rotate; A connecting assembly, comprising a motor connecting block and a fastening nut; the motor connecting block is sleeved on the drive shaft; the fastening nut is screwed onto the motor connecting block and located on the side of the motor connecting block opposite to the motor; and A lawn mowing blade, which is detachably fitted onto the fastening nut and clamped between the fastening nut and the motor connecting block; The rotation direction of the mowing blade is the same as the rotation direction when the fastening nut is tightened.

[0007] In one embodiment, the motor connecting block forms an annular groove, and the fastening nut includes a tightening part and a clamping part connected together; the tightening part is inserted into the annular groove and screwed to the inner wall of the annular groove; the two sides of the mowing blade abut against the periphery of the groove opening and the clamping part, respectively.

[0008] In one embodiment, the lawn mower blade has a slot on the side facing the clamping part, and the clamping part has a protruding locking block on the side facing the lawn mower blade; the locking block engages with the slot; and / or, The lawn mower blade has a protruding locking block on the side facing the clamping part, and the clamping part has a locking groove on the side facing the lawn mower blade; the locking block is engaged in the locking groove.

[0009] In one embodiment, there is a gap between the outer peripheral wall of the tightening part and the outer groove wall of the annular groove.

[0010] In one embodiment, the drive shaft has two parallel flat sections, and the motor connecting block has a snap-fit ​​hole; the two flat sections on the drive shaft snap into the inner wall of the snap-fit ​​hole.

[0011] In one embodiment, the connecting assembly further includes an end nut, with one end of the drive shaft away from the motor passing through the snap-fit ​​hole and screwed to the end nut.

[0012] In one embodiment, the fastening nut has a receiving hole, and the drive shaft extends into the receiving hole and is screwed into the end nut, with the end nut located inside the receiving hole.

[0013] In one embodiment, it also includes an anti-blocking frame, which includes a mounting part, a protective part, and multiple connecting parts; The mounting portion has a through hole for the drive shaft to pass through and is sandwiched between the motor and the motor connecting block; the two ends of each connecting portion are respectively connected between the mounting portion and the protective portion; There is a mowing space between the protective part and each of the connecting parts for the mowing blade to rotate, and the mowing space is located on the side of the mounting part away from the motor.

[0014] In one embodiment, the end of each connecting portion away from the mounting portion is bent away from the motor and is connected to the protective portion at intervals along the length of the protective portion.

[0015] This utility model also proposes a lawnmower, which includes a housing and the above-mentioned mowing device. The housing has an opening, the motor is located in the housing, and the mowing blade is located in the opening.

[0016] In the technical solution of this utility model, the mowing device includes a driving component, a connecting assembly, and a mowing blade; the driving component includes a motor and a drive shaft, the motor driving the drive shaft to rotate; the connecting assembly includes a motor connecting block and a fastening nut; the motor connecting block is sleeved on the drive shaft; the fastening nut is screwed onto the motor connecting block and located on the side of the motor connecting block away from the motor; the mowing blade is detachably sleeved on the fastening nut and clamped between the fastening nut and the motor connecting block; wherein, the rotation direction of the mowing blade is the same as the rotation direction when the fastening nut is tightened. In the technical solution of this utility model, the rotation direction of the mowing blade is the same as the tightening direction of the fastening nut. During normal operation, the mowing blade relies on friction to keep the nut locked. When the mowing blade momentarily contacts a hard object and decelerates, a speed difference is generated between the mowing blade and the drive shaft. This difference in torque immediately forces the fastening nut to loosen in the opposite direction, causing controllable slippage between the mowing blade and the motor connecting block. This cuts off the impact torque at the blade end, preventing rigid impact from being directly transmitted to the motor reduction mechanism, bearings, and control board, significantly reducing gear breakage, bearing jamming, and Hall element failure. The risk of failure or weld cracking is eliminated; after the impact disappears, the speed of the mowing blade approaches the speed of the drive shaft again, and the friction force drives the fastening nut to tighten itself again, and the mowing blade automatically returns to the working position. It can continue to work without manual intervention, realizing mechanical overload protection of "slipping when encountering an obstacle and automatically resetting when the obstacle is removed", improving the reliability of continuous operation; because the impact is released in time, the peak load on the motor and its internal precision components is greatly reduced, effectively extending the service life of key components such as gears, bearings, and control boards, and reducing the failure rate and after-sales maintenance costs of the lawnmower. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0018] Figure 1 A schematic diagram of an embodiment of the lawn mowing device provided by this utility model; Figure 2 This is an exploded view of a lawnmower. Figure 3 This is a cross-sectional view of the lawnmower. Figure 4 for Figure 3 A magnified view of a portion of the image.

[0019] Explanation of icon numbers: 1000-Mowing device; 1-Driver; 11-Motor; 12-Drive shaft; 12a-Flat part; 21-Motor connecting block; 21a-Ring groove; 21b-Snap-fit ​​hole; 22-Fastening nut; 221-Tightening part; 222-Clamping part; 22a-Accommodation hole; 23-End nut; 3-Mowing blade; 4-Anti-clogging frame; 41-Mounting part; 41a-Perforation; 42-Protective part; 43-Connecting part; 4a-Mowing space.

[0020] The realization of the purpose, functional features and advantages of this utility model will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0021] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present utility model.

[0022] It should be noted that if the embodiments of this utility model involve directional indicators (such as up, down, left, right, front, back, etc.), the directional indicators are only used to explain the relative positional relationship and movement of the components in a specific posture. If the specific posture changes, the directional indicators will also change accordingly.

[0023] Furthermore, if the embodiments of this utility model involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the use of "and / or" or "and / or" throughout the text includes three parallel solutions. For example, "A and / or B" includes solution A, solution B, or a solution where both A and B are satisfied simultaneously. Furthermore, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this utility model.

[0024] In existing technologies, lawnmowers generally use a rigid connection to fix the blades to the drive shaft, such as by directly locking them with screws. When the blades rotate at high speed and come into contact with hard objects such as stones, the instantaneous reverse impact torque is transmitted directly along the axial direction to precision components such as the motor reduction mechanism, bearings, and control boards, causing gear breakage, bearing jamming, or electronic component failure. Although this structure is convenient to assemble and disassemble, it is difficult to buffer impact force, resulting in a high failure rate. For example, during lawn maintenance, when the blades frequently hit hidden gravel or tree roots, the rigid connection structure cannot effectively absorb the impact energy, leading to accelerated wear of internal motor parts.

[0025] To solve the above problems, this utility model proposes a lawn mowing device 1000. Figure 1 , Figure 2 , Figure 3 as well as Figure 4 A schematic diagram of an embodiment of the lawn mowing device 1000 provided by this utility model.

[0026] Please refer to Figure 1 , Figure 2 , Figure 3 as well as Figure 4 This utility model proposes a lawn mowing device 1000, including a driving component 1, a connecting assembly, and a lawn mowing blade 3; the driving component 1 includes a motor 11 and a drive shaft 12, the motor 11 drives the drive shaft 12 to rotate; the connecting assembly includes a motor connecting block 21 and a fastening nut 22; the motor connecting block 21 is sleeved on the drive shaft 12; the fastening nut 22 is screwed onto the motor connecting block 21 and is located on the side of the motor connecting block 21 away from the motor 11; the lawn mowing blade 3 is detachably sleeved on the fastening nut 22 and clamped between the fastening nut 22 and the motor connecting block 21; wherein, the rotation direction of the lawn mowing blade 3 is the same as the rotation direction when the fastening nut 22 is tightened.

[0027] The drive shaft 12 is a shaft-shaped component that transmits rotational power, and can be made of metal. The motor connecting block 21 is a transitional connector that fits onto the drive shaft 12, used to form a threaded engagement with the fastening nut 22; the fastening nut 22 is a threaded locking component. The lawnmower blade 3 is a rotating component with a cutting edge, which can be fitted onto the outer circumference of the fastening nut 22 with an open structure, and fixed by pressure from both sides. Synchronized rotation direction means that the working direction of the lawnmower blade 3 is consistent with the tightening direction of the fastening nut 22, which can be achieved by clockwise rotation with a right-hand thread.

[0028] In the technical solution of this utility model, the rotation direction of the mowing blade 3 is the same as the tightening direction of the fastening nut 22. During normal operation, the mowing blade 3 is kept locked by friction. When the mowing blade 3 momentarily touches a hard object and decelerates, a speed difference is generated between the mowing blade 3 and the drive shaft 12. This difference in torque immediately forces the fastening nut 22 to loosen in the opposite direction, causing controllable slippage between the mowing blade 3 and the motor connecting block 21. This cuts off the impact torque at the blade end, preventing rigid impact from being directly transmitted to the motor reduction mechanism, bearings, and control board, significantly reducing gear breakage and bearing jamming. The risk of Hall element failure or solder joint cracking is eliminated; after the impact disappears, the speed of the mowing blade 3 approaches the speed of the drive shaft 12 again, and the friction force drives the fastening nut 22 to tighten again, and the mowing blade 3 automatically returns to the working position and can continue to work without manual intervention, realizing mechanical overload protection of "slipping when encountering an obstacle and automatically resetting when the obstacle is removed", improving the reliability of continuous operation; because the impact is released in time, the peak load on the motor and its internal precision components is greatly reduced, effectively extending the service life of key components such as gears, bearings, and control boards, and reducing the failure rate and after-sales maintenance cost of the lawnmower.

[0029] Please refer to Figure 2 , Figure 3 as well as Figure 4 In one embodiment of the present invention, the motor connecting block 21 forms an annular groove 21a, and the fastening nut 22 includes a tightening part 221 and a clamping part 222 connected to each other; the tightening part 221 is inserted into the annular groove 21a and screwed to the inner groove wall of the annular groove 21a; the two sides of the grass cutting blade 3 abut against the periphery of the groove opening of the annular groove 21a and the clamping part 222 respectively.

[0030] The annular groove 21a refers to the annular groove surrounding the drive shaft 12 on the motor connecting block 21. It can be formed by machining or casting and is used to accommodate the tightening part 221 of the fastening nut 22, achieving axial fixation through a threaded connection. The tightening part 221 refers to the threaded section on the fastening nut 22 that mates with the inner wall of the annular groove 21a. It can be an external thread structure, where rotation causes the threaded section to form a threaded connection with the inner wall of the annular groove 21a, thus connecting the fastening nut 22 to the motor connecting block 21. The clamping part 222 refers to the outwardly extending annular flange on the fastening nut 22. It can be integrally formed with the tightening part 221 and is used to clamp the mowing blade 3 together with the periphery of the groove opening of the annular groove 21a, restricting the radial displacement of the mowing blade 3.

[0031] Specifically, the inner wall of the annular groove 21a of the motor connecting block 21 is provided with an internal thread, and the outer wall of the tightening part 221 of the fastening nut 22 is provided with a corresponding external thread. When the fastening nut 22 is screwed into the annular groove 21a, the clamping part 222 moves axially with the tightening part 221 until the clamping part 222 and the periphery of the groove opening of the annular groove 21a together clamp the mowing blade 3. At this time, the mowing blade 3 is confined within the contact surface between the periphery of the groove opening of the annular groove 21a and the clamping part 222, and its rotation direction is consistent with the rotation direction when the fastening nut 22 is tightened, so that the centrifugal force generated by the high-speed rotation of the mowing blade 3 further compels the fastening nut 22 to remain in a locked state.

[0032] The mowing blade 3 is fixed between the motor connecting block 21 and the fastening nut 22 by the engagement of the annular groove 21a and the clamping part 222. The impact load is distributed to the contact surface between the groove wall of the annular groove 21a and the clamping part 222, avoiding direct transmission to the drive shaft 12. This effectively reduces the reverse torque transmission to the drive shaft 12 and internal motor components when the mowing blade 3 is impacted, reducing the risk of gear breakage, bearing jamming, and other malfunctions. At the same time, the design that the rotation direction is consistent with the rotation direction when the nut is tightened prevents the nut from loosening when the mowing blade 3 rotates at high speed, improving connection stability. In addition, the engagement of the annular groove 21a and the clamping part 222 eliminates the need to align the opening structure and the snap-fit ​​hole 21b on the mowing blade 3 during installation. The fastening nut 22, the mowing blade 3, and the motor connecting block 21 can be quickly fixed by the threaded connection of the annular groove 21a and the clamping part 222.

[0033] Furthermore, the grass-cutting blade 3 has a slot on the side facing the clamping part 222, and the clamping part 222 has a protruding locking block on the side facing the grass-cutting blade 3; the locking block is engaged in the slot; and / or, the grass-cutting blade 3 has a protruding locking block on the side facing the clamping part 222, and the clamping part 222 has a slot on the side facing the grass-cutting blade 3; the locking block is engaged in the slot.

[0034] In one embodiment of the present invention, a slot is provided on the side of the grass-cutting blade 3 facing the clamping part 222, and a locking block is protruding on the side of the clamping part 222 facing the grass-cutting blade 3; the locking block is engaged in the slot.

[0035] In another embodiment of this utility model, a locking block is provided on the side of the grass-cutting blade 3 facing the clamping part 222, and a locking groove is provided on the side of the clamping part 222 facing the grass-cutting blade 3; the locking block is engaged in the locking groove.

[0036] In another embodiment of the present invention, the grass-cutting blade 3 is provided with a slot on the side facing the clamping part 222 and the side facing the grass-cutting blade 3. The clamping part 222 and the side facing the clamping part 222 are both provided with a protruding locking block, and each locking block is engaged in the corresponding slot.

[0037] The slot refers to a recessed structure on the surface of the mower blade 3 or the clamping part 222, which can be a rectangular or trapezoidal groove, used to form a shape fit with the locking block. The locking block refers to a raised structure on the surface of the mower blade 3 or the clamping part 222, which can be a metal boss that matches the shape of the slot, used to restrict the relative rotation between the mower blade 3 and the clamping part 222. The snap-fit ​​refers to a mechanical connection formed by the interlocking of the concave and convex structures, which can be achieved by interference fit or clearance fit, used to provide additional anti-torsional support when the mower blade 3 rotates.

[0038] Specifically, when the fastening nut 22 is tightened by the thread, the axial pressure between the clamping part 222 and the motor connecting block 21 clamps and fixes the mowing blade 3. At this time, the interlocking structure of the locking block and the slot provides circumferential limiting effect. When the mowing blade 3 is impacted by a foreign object and generates a reverse torque, the locking structure can share part of the shearing force. For example, when the mowing blade 3 is cutting clockwise, if it suddenly impacts a hard object and generates a counterclockwise impact force, the side wall of the locking block will contact the side wall of the slot, thereby preventing relative sliding between the mowing blade 3 and the clamping part 222.

[0039] The lawnmower blade 3 and the fastening nut 22 are engaged by a snap-fit ​​structure. The snap-fit ​​structure converts part of the impact force into shear force between the snap block and the slot. Energy is absorbed by the deformation of the metal contact surface, thereby protecting the internal gears and bearings of the motor from instantaneous overload damage.

[0040] Please refer to Figure 4 In one embodiment of this utility model, there is a gap between the outer peripheral wall of the tightening part 221 and the outer groove wall of the annular groove 21a.

[0041] The gap refers to the non-contact space between the tightening part 221 and the outer wall of the annular groove 21a, which can be achieved by controlling the outer diameter of the tightening part 221 to be smaller than the inner diameter of the outer wall of the annular groove 21a. Specifically, when the mowing blade 3 generates a reverse impact torque due to collision with a hard object, the tightening part 221 of the fastening nut 22 is subjected to a radial force within the annular groove 21a. Due to the existence of the gap, the tightening part 221 can be slightly offset along the direction of the outer wall of the annular groove 21a, avoiding stress concentration caused by rigid contact. This offset is converted into axial displacement through the threaded connection, which dynamically adjusts the clamping force between the clamping part 222 and the periphery of the annular groove 21a, thereby buffering the transmission path of impact energy to the drive shaft 12 and the motor 11.

[0042] By using a gap design, a buffer space is provided for impact loads while maintaining the function of the threaded connection. This transforms the original rigid transmission into an elastic deformation absorption mechanism, effectively reducing the risk of damage to the drive shaft 12 and the internal structure of the motor from reverse impacts. This extends the service life of key components of the mowing device 1000 and avoids increased maintenance costs due to frequent parts replacement.

[0043] Please refer to Figure 2 In one embodiment of the present invention, the drive shaft 12 has two parallel flat parts 12a, and the motor connecting block 21 has a snap-fit ​​hole 21b; the two flat parts 12a on the drive shaft 12 are snapped into the inner wall of the snap-fit ​​hole 21b.

[0044] The flat portion 12a refers to the planar structure formed by machining the outer surface of the drive shaft 12. Specifically, it can be formed by milling or grinding two parallel planes symmetrically positioned around the drive shaft 12. Torque transmission is achieved through the contact surface between the plane and the inner wall of the snap-fit ​​hole 21b. The snap-fit ​​hole 21b refers to the irregular hole structure inside the motor connecting block 21 that mates with the drive shaft 12. Specifically, it can be formed by stamping or machining to create an inner wall contour that matches the shape of the flat portion 12a. The relative rotation between the drive shaft 12 and the motor connecting block 21 is restricted through the surface contact between the inner wall of the snap-fit ​​hole 21b and the flat portion 12a.

[0045] Specifically, the two flat sections 12a of the drive shaft 12 form a surface contact fit with the inner wall of the locking hole 21b. When the drive shaft 12 rotates, the contact surface between the flat sections 12a and the inner wall of the locking hole 21b directly transmits torque to the motor connecting block 21, avoiding circumferential sliding between the drive shaft 12 and the motor connecting block 21 due to rigid connection. When the mowing blade 3 is impacted, the fit structure between the flat sections 12a and the locking hole 21b disperses the impact load through surface contact, reducing stress concentration at the connection between the drive shaft 12 and the motor connecting block 21.

[0046] The mating structure of the flat part 12a and the snap-fit ​​hole 21b forms a surface contact force transmission path, which not only improves the torque transmission efficiency, but also reduces fatigue damage to the connection structure by dispersing the impact load. This solves the problem that rigid connections in the prior art are prone to damage to transmission components. The mating structure of the flat part 12a and the snap-fit ​​hole 21b achieves stable force transmission and reduces the impact of impact load on the motor reduction mechanism and bearings, thereby improving the reliability of the mowing device 1000 under complex working conditions.

[0047] Please refer to Figure 1 , Figure 2 , Figure 3 as well as Figure 4 In one embodiment of the present invention, the connecting assembly further includes an end nut 23, and the end of the drive shaft 12 away from the motor 11 passes through the snap-fit ​​hole 21b and is screwed to the end nut 23.

[0048] The end nut 23 is a fastening component used to axially fix the drive shaft 12 and the motor connecting block 21. Its thread specification matches the external thread at the end of the drive shaft 12. The drive shaft 12 passing through the snap-fit ​​hole 21b means that the end of the drive shaft 12 extends to the outside of the snap-fit ​​hole 21b of the motor connecting block 21. Specifically, axial locking is achieved by machining an external thread at the end of the drive shaft 12 and engaging it with the internal thread of the end nut 23. In other words, after the end of the drive shaft 12 passes through the snap-fit ​​hole 21b of the motor connecting block 21, the end nut 23 is tightened to engage with the thread at the end of the drive shaft 12, thus forming an axial constraint. When the mowing blade 3 is subjected to external impact, the end nut 23 and the motor connecting block 21 share the axial load, preventing relative displacement between the drive shaft 12 and the motor connecting block 21.

[0049] By adding end nuts 23 to form a two-way constraint structure, the connection rigidity between the drive shaft 12 and the motor connecting block 21 is improved. The threaded engagement between the end nuts 23 and the drive shaft 12 can automatically compensate for the assembly gap, ensuring the stability of the connection structure during long-term use and extending the service life of key components.

[0050] Furthermore, in one embodiment of the present invention, the fastening nut 22 has a receiving hole 22a, the drive shaft 12 extends into the receiving hole 22a and is screwed into the end nut 23, the end nut 23 being located in the receiving hole 22a.

[0051] The receiving hole 22a refers to a through hole located inside the fastening nut 22 and extending axially. It can be implemented using a cylindrical or stepped hole structure, and is used to provide installation space for the end nut 23 and restrict its radial displacement. The end nut 23 being located inside the receiving hole 22a means that the end nut 23 is completely located within the cavity of the fastening nut 22. This can be achieved using a countersunk nut structure to prevent the end nut 23 from being exposed on the surface of the fastening nut 22.

[0052] By fully integrating the end nut 23 into the receiving hole 22a, both axial locking is achieved and foreign objects are prevented from entering through the closed structure, while the overall axial length of the drive shaft 12 assembly is reduced.

[0053] Please refer to Figure 1 , Figure 2 as well as Figure 3In one embodiment of the present invention, the mowing device 1000 further includes an anti-clogging frame 4, which includes a mounting part 41, a protective part 42, and a plurality of connecting parts 43. The mounting part 41 has a through hole 41a for the drive shaft 12 to pass through and is sandwiched between the motor 11 and the motor connecting block 21. The two ends of each connecting part 43 are respectively connected between the mounting part 41 and the protective part 42. There is a mowing space 4a between the protective part 42 and each connecting part 43 for the mowing blade 3 to rotate. The mowing space 4a is located on the side of the mounting part 41 away from the motor 11.

[0054] The mounting section 41 is a structural component used to fix the anti-clogging frame 4. Specifically, it can be implemented using an annular metal plate with perforations 41a, allowing the drive shaft 12 to pass through and clamp and fix it to the motor connecting block 21. The protective section 42 is an arc-shaped protective structure covering the periphery of the mowing blade 3. Specifically, it can be implemented using a stamped metal plate to block flying debris and limit the blade's working range. The connecting section 43 is a supporting member connecting the mounting section 41 and the protective section 42. Specifically, it can be implemented using a bent metal strip. The mowing space 4a is the area enclosed by the protective section 42 and the connecting section 43. Specifically, the height of the space can be controlled by adjusting the bending angle of the connecting section 43, allowing the blade to effectively cut while avoiding interference with the protective structure during rotation.

[0055] Specifically, the mounting part 41 is clamped between the motor 11 and the motor connecting block 21 (the top surface of the motor connecting block 21 abuts against the outer periphery of the outlet of the through hole 41a), and is axially positioned by the drive shaft 12 passing through its through hole 41a. The mowing space 4a formed by the protective part 42 and the connecting part 43 allows the mowing blade 3 to rotate within a predetermined range.

[0056] The protective section 42 can initially prevent large hard objects from entering the mowing space 4a, reducing the probability of the mowing blade 3 colliding with hard objects. This can effectively extend the service life of key components such as gears, bearings, and control boards, and reduce the failure rate and after-sales maintenance costs of the lawnmower. In addition, since the top surface of the motor connecting block 21 abuts against the outer periphery of the outlet of the perforation 41a, it prevents debris (including grass clippings) from getting tangled on the drive shaft 12.

[0057] Please refer to Figure 1 , Figure 2 as well as Figure 3 In one embodiment of the present invention, the end of each connecting part 43 away from the mounting part 41 is bent away from the motor 11 and is connected to the protective part 42 at intervals along the length direction of the protective part 42.

[0058] Specifically, the bending of the end of the connecting part 43 away from the mounting part 41 towards the direction away from the motor 11 means that the end of the connecting part 43 forms a curved structure in the direction away from the motor 11. This can be achieved by stamping or bending processes, and the bending angle can be an obtuse angle or an arc transition. The spaced connection of the connecting parts 43 along the length direction of the protective part 42 means that multiple connecting parts 43 are distributed at a certain distance along the extension direction of the protective part 42, and the spacing can be uniform or non-uniform.

[0059] Specifically, the mounting part 41 is sleeved on the drive shaft 12 through the through hole 41a and clamped between the motor 11 and the motor connecting block 21 to form a stable support. Multiple connecting parts 43 extend from the mounting part 41 to the protective part 42, and their ends are bent and fixed to the protective part 42 at intervals, so that a mowing space 4a surrounding the mowing blade 3 is formed between the protective part 42 and the connecting parts 43.

[0060] Each connecting part 43 is bent away from the mounting part 41 at the end away from the motor 11, forming a larger mowing space 4a with the protective part 42. This prevents the mowing blade 3 from contacting the anti-clogging frame 4 or the drive component 1 due to shaking when rotating, thus avoiding accidents. When the mowing blade 3 cuts grass, some broken grass will fly upwards. The spaced connecting parts 43 can block the upward-flying broken grass, so the broken grass will not accumulate in the gap between the mower's casing and the drive component 1 and cause blockage. In addition, when the mowing blade 3 rotates at high speed, it will reduce the air pressure in the mowing space 4a. Therefore, the flying broken grass can be sucked into the mowing space 4a from the space above the mowing blade 3, thus preventing the anti-clogging frame 4 from being blocked by too much broken grass.

[0061] This utility model also proposes a lawnmower, which includes a housing and a mowing device 1000. The specific structure of the mowing device 1000 is as described in the above embodiments. Since this lawnmower adopts all the technical solutions of all the above embodiments, it has at least all the beneficial effects brought about by the technical solutions of the above embodiments, which will not be described in detail here. The housing has an opening, the motor 11 is located in the housing, and the mowing blade 3 is located at the opening.

[0062] The above description is merely an exemplary embodiment of the present utility model and does not limit the patent scope of the present utility model. Any equivalent structural transformations made based on the technical concept of the present utility model and the contents of the present utility model specification and drawings, or direct / indirect applications in other related technical fields, are included within the patent protection scope of the present utility model.

Claims

1. A lawn mowing device, characterized in that, include: A driving component (1) includes a motor (11) and a drive shaft (12), wherein the motor (11) drives the drive shaft (12) to rotate; A connecting assembly, the connecting assembly including a motor connecting block (21) and a fastening nut (22); the motor connecting block (21) is sleeved on the drive shaft (12); the fastening nut (22) is screwed onto the motor connecting block (21) and is located on the side of the motor connecting block (21) away from the motor (11); as well as A lawn mowing blade (3) is detachably fitted onto the fastening nut (22) and sandwiched between the fastening nut (22) and the motor connecting block (21); The rotation direction of the grass-cutting blade (3) is the same as the rotation direction of the fastening nut (22) when it is tightened.

2. The lawn mowing device as described in claim 1, characterized in that, The motor connecting block (21) has an annular groove (21a), and the fastening nut (22) includes a tightening part (221) and a clamping part (222) connected to each other; the tightening part (221) is inserted into the annular groove (21a) and screwed to the inner wall of the annular groove (21a); ​​the two sides of the grass cutting blade (3) abut against the periphery of the groove opening of the annular groove (21a) and the clamping part (222) respectively.

3. The lawn mowing device as described in claim 2, characterized in that, The lawn mower blade (3) has a slot on the side facing the clamping part (222), and the clamping part (222) has a protruding locking block on the side facing the lawn mower blade (3); the locking block engages with the slot; and / or, The grass-cutting blade (3) has a protruding locking block on the side facing the clamping part (222), and the clamping part (222) has a locking groove on the side facing the grass-cutting blade (3); the locking block is engaged in the locking groove.

4. The lawn mowing device as described in claim 2, characterized in that, There is a gap between the outer peripheral wall of the tightening part (221) and the outer groove wall of the annular groove (21a).

5. The lawn mowing device as described in claim 1, characterized in that, The drive shaft (12) has two parallel flat sections (12a), and the motor connecting block (21) has a snap-fit ​​hole (21b); the two flat sections (12a) on the drive shaft (12) are snapped into the inner wall of the snap-fit ​​hole (21b).

6. The lawn mowing device as described in claim 5, characterized in that, The connecting assembly also includes an end nut (23), and one end of the drive shaft (12) away from the motor (11) passes through the snap-fit ​​hole (21b) and is screwed to the end nut (23).

7. The lawn mowing device as described in claim 6, characterized in that, The fastening nut (22) has a receiving hole (22a), and the drive shaft (12) extends into the receiving hole (22a) and is screwed into the end nut (23). The end nut (23) is located in the receiving hole (22a).

8. The lawn mowing device as described in any one of claims 1 to 7, characterized in that, It also includes an anti-blocking frame (4), which includes a mounting part (41), a protective part (42), and multiple connecting parts (43); The mounting part (41) has a through hole (41a) for the drive shaft (12) to pass through, and is sandwiched between the motor (11) and the motor connecting block (21); the two ends of each connecting part (43) are respectively connected between the mounting part (41) and the protective part (42); The protective part (42) and each of the connecting parts (43) have a mowing space (4a) for the mowing blade (3) to rotate, and the mowing space (4a) is located on the side of the mounting part (41) away from the motor (11).

9. The lawn mowing device as described in claim 8, characterized in that, Each of the connecting portions (43) is bent away from the mounting portion (41) at one end and is connected to the protective portion (42) at intervals along the length of the protective portion (42).

10. A lawnmower, characterized in that, The lawnmower includes a housing and a mowing device (1000) as claimed in any one of claims 1 to 9, the housing having an opening, the motor (11) being disposed in the housing, and the mowing blade (3) being located at the opening.

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