A lawnmower for gardens

Abstract

This invention discloses a lawnmower for gardens, relating to the field of lawnmowing technology. It includes a housing, on which a mowing assembly and a driving assembly are mounted. The driving assembly moves the lawnmower across the grass. The mowing assembly includes a mowing motor installed within the housing, with a fan disc and mowing blades mounted on the motor's drive shaft. Both the fan disc and the mowing blades are located at the bottom of the housing, with the fan disc's vertical height exceeding that of the mowing blades. A retaining ring surrounds the fan disc and the mowing blades at the bottom of the housing. When the mowing motor drives the fan disc and the mowing blades to rotate synchronously, a semi-enclosed airflow channel is formed within the retaining ring of the housing. The airflow generated by the fan disc partially counteracts the upward negative pressure generated by the mowing blades. This invention solves the problem in existing technologies where grass blades flatten before cutting due to the negative pressure of the blades, resulting in poor cutting performance.

Description

Technical Field

[0001] This invention relates to the field of lawn mowing technology, and more particularly to a lawn mower for gardens. Background Technology

[0002] As a type of garden maintenance equipment, lawn mowers are widely used in lawns, parks, golf courses and other settings. Their core function is to trim herbaceous vegetation through a cutting device.

[0003] In existing technology, traditional lawnmowers typically consist of a walking assembly and a mowing assembly. The walking assembly drives the mowing assembly to achieve continuous mowing operations. However, during cutting operations, the blades of traditional lawnmowers (especially those with a grass-collecting or side-mounted blades) rotate at high speed, creating a negative pressure zone above them (similar to the low-pressure zone above an aircraft wing). This negative pressure tends to "suck" the grass blades downwards, causing them to lie flat or lie close to the ground instead of standing upright. This results in inconsistent cutting heights; grass near the blades is cut very short, while flattened grass may not be cut or may be cut too high, leading to poor grass cutting results.

[0004] It is evident that in existing technologies, grass blades flatten due to negative pressure on the blades before being cut by the lawnmower, resulting in poor cutting performance. Summary of the Invention

[0005] The purpose of this invention is to provide a lawnmower for gardens that solves the problem in the prior art where grass blades flatten due to negative pressure on the blades before cutting, resulting in poor cutting performance.

[0006] To achieve this objective, the present invention adopts the following technical solution:

[0007] A lawnmower for gardens includes a housing, on which a mowing assembly and a propulsion assembly are mounted. The propulsion assembly is used to move the lawnmower on the grass. The mowing assembly includes a mowing motor installed inside the housing, and a fan and mowing blades are mounted on the drive shaft of the mowing motor.

[0008] The fan and the mowing blade are both located at the bottom of the housing. The vertical height of the fan is higher than the vertical height of the mowing blade. The bottom of the housing is provided with a retaining ring for surrounding the fan and the mowing blade.

[0009] When the mowing motor drives the fan and the mowing blade to rotate synchronously, a semi-enclosed airflow channel is formed in the retaining ring of the housing. The airflow generated by the fan partially counteracts the vertical upward negative pressure generated by the mowing blade.

[0010] Optionally, a discharge chamber is provided inside the housing, the discharge chamber is in communication with the side wall of the housing, and a baffle for blocking the outlet of the discharge chamber is hinged to the housing.

[0011] Optionally, the fan plate includes a base plate, a rotating platform is provided at the center of the base plate, and a plurality of spaced and spirally distributed air-guiding plates are installed on the base plate.

[0012] The bottom plate, the rotating platform, and the air-guiding plate are integrally formed. One end of the air-guiding plate is connected to the rotating platform, and the other end of the air-guiding plate does not extend out of the bottom plate.

[0013] Optionally, the rotating table is provided with a stepped through groove, the drive shaft of the mowing motor is inserted into the through groove, the mowing blade is provided with a through hole corresponding to the through groove, and a fastening screw is inserted through the through hole;

[0014] The fastening screw passes through the through hole and the through slot in sequence and is threaded to the drive shaft of the mowing motor, so that the fan and the mowing blade are securely mounted on the drive shaft.

[0015] Optionally, the air-guiding plate is provided with a first air-guiding surface, a second air-guiding surface and a third air-guiding surface in sequence along the direction away from the rotating platform. The height of the first air-guiding surface, the second air-guiding surface and the third air-guiding surface gradually increases in the vertical direction. The bottom plate is provided with at least one air guide plate located between two adjacent air-guiding plates.

[0016] Optionally, the wind base plate is provided with at least one first ventilation hole located between two adjacent wind guide plates, the grass cutting blade is provided with a second ventilation hole for communicating with the first ventilation hole, the wind guide plate and the third wind guide surface are at the same height in the vertical direction, and the wind guide plate is spaced apart from the rotating table.

[0017] Optionally, the air guide plate is provided with a first air guide hole, a second air guide hole and a third air guide hole, the height of the first air guide hole, the second air guide hole and the third air guide hole gradually increases in the vertical direction, and the air guide plate is provided with at least one air guide hole.

[0018] Optionally, the wind base plate is provided with two positioning posts arranged diagonally, the grass cutting blade is provided with two first positioning holes arranged diagonally, and the grass cutting blade is provided with a second positioning hole arranged adjacent to the first positioning hole. Both the first positioning hole and the second positioning hole are used for insertion and positioning with the positioning posts.

[0019] When the positioning pin is inserted into the first positioning hole, the first ventilation hole and the second ventilation hole are connected; when the positioning pin is inserted into the second positioning hole, the first ventilation hole and the second ventilation hole are not connected.

[0020] Optionally, the pushing assembly includes four movable wheels rotatably connected to the four corners of the housing, and a first pushing rod is fixedly installed on the housing in a relatively distributed manner. The first pushing rod is connected to a second pushing rod, and the first pushing rod and the second pushing rod are fixedly connected by a locking handle.

[0021] Optionally, a track is covered on every two movable wheels, and two movable teeth are symmetrically provided on the outer wall of each movable wheel. The track is provided with gear grooves and gear protrusions that are adapted to the movable teeth respectively. The gear grooves and gear protrusions are alternately arranged, and the outer wall of the track is provided with a plurality of movable protrusions.

[0022] Compared with the prior art, the present invention has the following beneficial effects:

[0023] This invention provides a lawnmower for gardens. By mounting a fan disc on the drive shaft of the mowing motor, positioned vertically above the mowing blades, and with a retaining ring at the bottom of the casing surrounding the fan disc and blades, a semi-enclosed airflow channel is formed. This allows the fan disc to generate downward airflow as it rotates synchronously with the blades, partially counteracting the upward negative pressure caused by the blades' rotation. This effectively reduces the problem of grass blades flattening due to negative pressure, ensuring the grass blades remain relatively natural or upright before mowing. This improves the consistency of grass cutting, enhances mowing efficiency, and avoids uneven cutting height, thereby improving mowing quality and work efficiency. Therefore, this invention solves the problem in existing technologies where grass blades flatten before cutting due to negative pressure, resulting in poor mowing performance. Attached Figure Description

[0024] To more clearly illustrate the technical solutions in the embodiments of the present invention 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 the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0025] The structures, proportions, sizes, etc., shown in the accompanying drawings of this specification are only for the purpose of assisting those skilled in the art in understanding and reading the content disclosed in the specification, and are not intended to limit the conditions under which the present invention can be implemented. Therefore, they have no substantial technical significance. Any modifications to the structure, changes in the proportions, or adjustments to the size, without affecting the effects and objectives that the present invention can produce, should still fall within the scope of the technical content disclosed in the present invention.

[0026] Figure 1 A three-dimensional structural diagram of a lawnmower for gardens provided in an embodiment of the present invention;

[0027] Figure 2 for Figure 1 A magnified structural diagram at point A;

[0028] Figure 3 A front view of a lawnmower for gardens provided in an embodiment of the present invention;

[0029] Figure 4 for Figure 3 A schematic diagram of the BB cross-sectional structure;

[0030] Figure 5 for Figure 4 A magnified structural diagram at point C;

[0031] Figure 6 This is a partial structural diagram of a lawnmower for gardens provided in an embodiment of the present invention;

[0032] Figure 7 A schematic diagram of the connection structure between the air disc and the mowing blade in a lawnmower for gardening, provided by an embodiment of the present invention;

[0033] Figure 8 This is a three-dimensional structural diagram of a wind disk in a lawnmower for gardens, provided as an embodiment of the present invention.

[0034] Illustration:

[0035] 10. Machine casing; 11. Retaining ring; 12. Discharge chamber;

[0036] 20. Mowing assembly; 21. Mowing motor; 211. Drive shaft; 22. Fan coil; 221. Fan base plate; 2211. First ventilation hole; 2212. Positioning post; 222. Rotating table; 2221. Through slot; 223. Air guide plate; 2231. First air guide surface; 2232. Second air guide surface; 2233. Third air guide surface; 2234. First air guide hole; 2235. Second air guide hole; 2236. Third air guide hole; 224. Air guide plate; 2241. Air guide hole; 23. Mowing blade; 231. Perforation; 232. Second ventilation hole; 233. First positioning hole; 234. Second positioning hole; 24. Fastening screw; 25. First mounting bracket; 26. Second mounting bracket;

[0037] 30. Pushing assembly; 31. Moving wheel; 311. Moving tooth; 32. First push rod; 33. Second push rod; 34. Locking handle; 35. Moving track; 351. Gear groove; 352. Gear protrusion; 353. Moving protrusion;

[0038] 40. Baffle;

[0039] 50. Engine cover. Detailed Implementation

[0040] To make the objectives, features, and advantages of this invention more apparent and understandable, the technical solutions of the embodiments of this invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the embodiments described below are only some embodiments of this invention, and not all embodiments. Based on the embodiments of this invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this invention.

[0041] In the description of this invention, it should be understood that the terms "upper," "lower," "top," "bottom," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the invention. It should be noted that when a component is considered to be "connected" to another component, it can be directly connected to the other component or there may be a component positioned centrally in the connection.

[0042] The technical solution of the present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0043] This invention provides a lawnmower for gardens, such as... Figures 1 to 8As shown, it includes a housing 10, on which a mowing assembly 20 and a pushing assembly 30 are mounted. The pushing assembly 30 is used to drive the mower to move on the grass. The mowing assembly 20 includes a mowing motor 21 installed inside the housing 10. A fan 22 and a mowing blade 23 are mounted on the drive shaft 211 of the mowing motor 21.

[0044] The fan disc 22 and the mowing blade 23 are both located at the bottom of the housing 10. The height of the fan disc 22 in the vertical direction is higher than the height of the mowing blade 23 in the vertical direction. The bottom of the housing 10 is provided with a retaining ring 11 for surrounding the fan disc 22 and the mowing blade 23.

[0045] When the mowing motor 21 drives the fan disc 22 and the mowing blades 23 to rotate synchronously, a semi-enclosed airflow channel is formed within the retaining ring 11 of the housing 10. The airflow generated by the fan disc 22 partially counteracts the upward vertical negative pressure generated by the mowing blades 23. It is worth noting that a cover 50 for sealing the mowing motor 21 is installed on the housing 10, and the housing 10 and the cover 50 are fastened together with screws. A first mounting bracket and a second mounting bracket are fastened together inside the housing 10, covering the mowing motor 21 and fastened together with screws.

[0046] It should be noted that the lawnmower for gardens provided by this invention, by setting a fan disc 22 on the drive shaft 211 of the mowing motor 21 and positioning the fan disc 22 vertically above the mowing blades 23, and simultaneously setting a retaining ring 11 at the bottom of the housing 10 to surround the fan disc 22 and the mowing blades 23, forms a semi-enclosed airflow channel. This allows the fan disc 22 to generate downward airflow as it rotates synchronously with the mowing blades 23, thereby partially counteracting the upward negative pressure caused by the rotation of the mowing blades 23. This effectively reduces the problem of grass blades collapsing due to negative pressure, allowing the grass blades to maintain a more natural or upright state before mowing, improving the consistency of grass cutting, enhancing the mowing effect, avoiding uneven cutting height, and thus improving mowing quality and work efficiency. Therefore, this invention solves the problem in the prior art where grass blades collapse due to negative pressure before mowing, resulting in poor mowing performance.

[0047] like Figures 1 to 4 As shown, a discharge chamber 12 is provided inside the housing 10, and the discharge chamber 12 is connected to the side wall of the housing 10. A baffle 40 is hinged to the housing 10 to block the outlet of the discharge chamber 12.

[0048] In practical implementation, a discharge chamber 12 is provided inside the casing 10 and is made to communicate with the side wall of the casing 10, forming an effective discharge channel for the cut grass clippings. This helps the grass clippings to be discharged from the mowing area in a timely and smooth manner, preventing grass clippings from accumulating and affecting the mowing effect. Simultaneously, a baffle 40 is hinged to the casing 10 to surround the outlet of the discharge chamber 12, making the discharge structure adjustable. The discharge channel can be opened or closed, or the discharge direction adjusted, according to actual usage needs, thereby improving the flexibility and adaptability of the discharge. This structure ensures the orderly discharge of grass clippings and also contributes to the cleanliness and efficiency of the mowing operation.

[0049] like Figures 3 to 8 As shown, the fan plate 22 includes a bottom plate 221, a rotating platform 222 is provided at the center of the bottom plate 221, and several spaced and spirally distributed air-guiding plates 223 are installed on the bottom plate 221.

[0050] The bottom plate 221, the rotating platform 222 and the air duct 223 are integrally formed. One end of the air duct 223 is connected to the rotating platform 222, and the other end of the air duct 223 does not extend out of the bottom plate 221.

[0051] It should be noted that, due to the integrated design of the fan disc 22, consisting of a base plate 221, a rotating platform 222, and several spiral air guide plates 223, the problems of loose connections, large processing errors, or unstable operation found in traditional assembly structures are avoided, thus improving the overall structural strength, stability, and manufacturing precision. The spiral air guide plates 223 are spaced apart along the base plate 221, with one end connected to the rotating platform 222 and the other end not extending beyond the base plate 221. This allows the fan disc 22 to efficiently guide airflow to form a directional rotating wind field during rotation, enhancing airflow efficiency and effectively interfering with and regulating the negative pressure generated above the mowing blades 23, thereby improving airflow stability. This design not only optimizes the airflow channel structure but also further enhances the ability to maintain the verticality of the grass blades during mowing, thereby improving cutting consistency and overall mowing effect.

[0052] like Figures 3 to 8 As shown, the rotating table 222 is provided with a through groove 2221 arranged in a stepped shape. The drive shaft 211 of the mowing motor 21 is inserted into the through groove 2221. The mowing blade 23 is provided with a through hole 231 corresponding to the through groove 2221. A fastening screw 24 is inserted through the through hole 231.

[0053] The fastening screw 24 passes through the through hole 231 and the through groove 2221 in sequence and is threaded to the drive shaft 211 of the mowing motor 21 so that the fan disc 22 and the mowing blade 23 are securely mounted on the drive shaft 211.

[0054] In this embodiment, a stepped through-slot 2221 is provided on the rotating platform 222 to precisely position the drive shaft 211 of the mowing motor 21. A structural design corresponding to the through-holes 231 on the mowing blades 23 allows for coaxial mounting of the fan disc 22 and the mowing blades 23. Fastening screws 24 pass sequentially through the through-holes 231 of the mowing blades 23 and the through-slot 2221 of the rotating platform 222 before being threaded onto the drive shaft 211. This simplifies the assembly process of the fan disc 22 and the mowing blades 23, facilitating disassembly and maintenance, while ensuring coaxial fastening of both on the drive shaft 211, thus improving the stability and reliability of the components during rotation. The stepped through-slot 2221 also provides a larger contact area and stronger fit, preventing loosening or displacement of the fan disc 22 or the mowing blades 23 during high-speed rotation, thereby enhancing the operational safety and durability of the entire mowing system.

[0055] like Figure 8 As shown, the air-guiding plate 223 is provided with a first air-guiding surface 2231, a second air-guiding surface 2232, and a third air-guiding surface 2233 in sequence along the direction away from the rotating platform 222. The height of the first air-guiding surface 2231, the second air-guiding surface 2232, and the third air-guiding surface 2233 gradually increases in the vertical direction. At least one air guide plate 224 is provided on the bottom plate 221 between two adjacent air-guiding plates 223. The first air-guiding surface, the second air-guiding surface 2232, and the third air-guiding surface 2233 are all curved surfaces.

[0056] In practice, the air intake plate 223 is sequentially equipped with a first air intake surface 2231, a second air intake surface 2232, and a third air intake surface 2233. The height of each air intake surface gradually increases along the direction away from the rotating platform 222, forming a stepped, ascending airflow guiding structure. This allows the airflow to accelerate and be guided layer by layer as the fan disc 22 rotates, thereby more efficiently forming a directional rotating airflow. This enhances the airflow control effect on the mowing area, further weakens the negative pressure above the mowing blades 23, and prevents grass blades from falling over. Simultaneously, a guide plate 224 is installed on the bottom plate 221 between adjacent air intake plates 223, which helps optimize the local airflow distribution, reduce turbulence and dead zones, and improve the stability and uniformity of the airflow. This structural design not only improves the airflow efficiency but also enhances the overall ventilation and grass-scattering capacity of the machine, thereby improving the overall quality and efficiency of the mowing operation.

[0057] like Figure 8 As shown, the wind base plate 221 is provided with at least one first ventilation hole 2211 located between two adjacent air guide plates 223, and the grass cutting blade 23 is provided with a second ventilation hole 232 for communicating with the first ventilation hole 2211. The air guide plate 224 and the third air guide surface 2233 are at the same height in the vertical direction, and the air guide plate 224 and the rotating table 222 are spaced apart.

[0058] In this embodiment, by providing a first ventilation hole 2211 on the base plate 221 between two adjacent air guide plates 223, and a second ventilation hole 232 on the mowing blade 23 connected to the first ventilation hole 2211, the airflow generated when the fan disc 22 rotates not only forms an orderly flow on the upper surface of the fan disc 22, but also achieves the exchange and connection of airflow between the upper and lower surfaces through the ventilation structure between the base plate 221 and the mowing blade 23. This enhances the overall airflow effect and the unobstructed flow of the chip removal channel, helping to quickly remove the cut grass clippings and prevent blockage and accumulation. Furthermore, the air guide plate 224 and the third air guide surface 2233 are at the same height in the vertical direction and are spaced apart from the rotating platform 222, ensuring a continuous streamline distribution of airflow between the horizontal and vertical planes. This further reduces turbulence, improves wind pressure distribution, and thus enhances the directionality and stability of airflow guidance. This design not only improves the aerodynamic efficiency of the fan disc 22, but also further strengthens the ventilation and chip removal performance of the mowing area, optimizing the mowing environment and effect.

[0059] like Figure 8 As shown, the air guide plate 223 is provided with a first air guide hole 2234, a second air guide hole 2235 and a third air guide hole 2236. The height of the first air guide hole 2234, the second air guide hole 2235 and the third air guide hole 2236 gradually increases in the vertical direction. The air guide plate 224 is provided with at least one air guide hole 2241.

[0060] It should be noted that by setting a first air intake hole 2234, a second air intake hole 2235, and a third air intake hole 2236 on the air intake plate 223, with these air intake holes increasing in height vertically, the airflow can be effectively introduced and released in layers at different heights. This forms a multi-layered, multi-directional airflow channel, improving the uniformity of the overall wind pressure distribution, enhancing the ability to weaken negative pressure areas, and improving the vertical state of the grass blades in the mowing area, thus contributing to a more uniform and efficient mowing effect. Simultaneously, setting at least one air guide hole 2241 on the air guide plate 224 helps guide the airflow laterally between the air intake plates 223, further alleviating local turbulence or pressure buildup problems, making the airflow path more continuous and smooth. This design structure, while ensuring the airflow driving efficiency of the fan disc 22, improves the diversity and adjustability of ventilation, further enhancing the overall mowing efficiency and operational stability of the machine.

[0061] like Figures 1 to 8 As shown, the wind base plate 221 is provided with two positioning posts 2212 arranged diagonally, the grass cutting blade 23 is provided with two first positioning holes 233 arranged diagonally, and the grass cutting blade 23 is provided with a second positioning hole 234 arranged adjacent to the first positioning hole 233. The first positioning hole 233 and the second positioning hole 234 are both used for insertion and positioning with the positioning posts 2212.

[0062] When the positioning pin 2212 is inserted into the first positioning hole 233, the first ventilation hole 2211 and the second ventilation hole 232 are connected; when the positioning pin 2212 is inserted into the second positioning hole 234, the first ventilation hole 2211 and the second ventilation hole 232 are not connected.

[0063] In this embodiment, by setting two diagonally arranged positioning posts 2212 on the wind base plate 221 and corresponding first positioning holes 233 and second positioning holes 234 on the mowing blade 23, precise positioning of the mowing blade 23 during installation is achieved, improving assembly efficiency and stability. Furthermore, by selecting different positioning holes, the installation angle or position of the blade relative to the fan disc 22 can be changed, thereby switching the connection state between the first ventilation hole 2211 on the wind base plate 221 and the second ventilation hole 232 on the mowing blade 23. When the positioning post 2212 is inserted into the first positioning hole 233, the first ventilation hole 2211 and the second ventilation hole 232 are connected, allowing airflow to penetrate the blade for vertical ventilation, which enhances airflow efficiency and improves ventilation and chip removal. When the positioning post 2212 is inserted into the second positioning hole 234, the ventilation holes are not connected, and the airflow path is partially blocked, adapting to the varying requirements of airflow intensity or exhaust direction in different operating scenarios. This structure not only enables the switching and adjustment of ventilation paths, but also maintains the simplicity and stability of the structure, thereby improving the functionality, flexibility, and adaptability of the lawnmower.

[0064] like Figures 1 to 3 As shown, the push assembly 30 includes four movable wheels 31 rotatably connected to the four corners of the housing 10. The housing 10 is fixedly mounted with relatively distributed first push rods 32. The first push rods 32 are connected to second push rods 33. The first push rods 32 and the second push rods 33 are fixedly connected by a locking handle 34.

[0065] In practical implementation, by setting rotatable casters 31 at the four corners of the housing 10, the lawnmower can move flexibly on the grass, improving the convenience and maneuverability of operation. Simultaneously, by fixing relatively distributed first push rods 32 to the housing 10 and connecting them to second push rods 33 at different angles, with the two fixedly connected by a locking handle 34, the pushing assembly 30 can be adjusted according to the operator's height or usage habits, improving ergonomics. Furthermore, the detachable or foldable connection between the first push rod 32 and the second push rod 33 facilitates the storage and transportation of the lawnmower when not in use, enhancing the equipment's practicality and portability.

[0066] like Figures 1 to 4As shown, each pair of movable wheels 31 is covered with a movable track 35. Two movable teeth 311 are symmetrically arranged on the outer wall of each movable wheel 31. The movable track 35 is provided with gear grooves 351 and gear protrusions 352 that are adapted to the movable teeth 311 respectively. The gear grooves 351 and gear protrusions 352 are alternately arranged. The outer wall of the movable track 35 is provided with a number of movable protrusions 353.

[0067] In this embodiment, by setting a moving track 35 between every two moving wheels 31, the contact area between the lawnmower and the ground is increased, improving its passability and stability on uneven grass or soft ground. Each moving wheel 31 has symmetrically arranged moving teeth 311 on its outer wall. These moving teeth 311 mesh with alternating gear grooves 351 and gear protrusions 352 on the moving track 35, effectively preventing slippage or derailment during operation and improving the reliability and stability of the drive transmission. Furthermore, the outer wall of the moving track 35 is provided with several moving protrusions 353, which enhances its friction with the ground, improving the overall grip and adaptability to complex terrain, further enhancing the lawnmower's ability to operate under various ground conditions.

[0068] Working Principle: This invention provides a lawnmower for gardens. A fan disc 22 is mounted on the drive shaft 211 of the mowing motor 21, positioned vertically above the mowing blades 23. A retaining ring 11 surrounds the fan disc 22 and the mowing blades 23 at the bottom of the housing 10, forming a semi-enclosed airflow channel. As the fan disc 22 rotates synchronously with the mowing blades 23, it generates a downward airflow, partially counteracting the upward negative pressure caused by the rotation of the mowing blades 23. This effectively reduces the problem of grass blades collapsing due to negative pressure, allowing the grass blades to maintain a more natural or upright state before mowing, improving the consistency of grass cutting, enhancing mowing effect, and avoiding uneven cutting height, thereby improving mowing quality and work efficiency. Therefore, this invention solves the problem in existing technologies where grass blades collapse due to negative pressure before mowing, resulting in poor mowing performance.

[0069] The above-described embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit it. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A lawnmower for gardens, characterized in that, The device includes a housing (10), on which a mowing assembly (20) and a push assembly (30) are mounted. The push assembly (30) is used to drive the mower to move on the grass. The mowing assembly (20) includes a mowing motor (21) installed inside the housing (10). A fan (22) and mowing blades (23) are mounted on the drive shaft (211) of the mowing motor (21). The fan disc (22) and the mowing blade (23) are both located at the bottom of the housing (10). The height of the fan disc (22) in the vertical direction is higher than the height of the mowing blade (23) in the vertical direction. The bottom of the housing (10) is provided with a retaining ring (11) for surrounding the fan disc (22) and the mowing blade (23). The fan plate (22) includes a base plate (221), a rotating platform (222) is provided at the center of the base plate (221), and a plurality of spaced and spirally arranged air guide plates (223) are installed on the base plate (221); at least one first ventilation hole (2211) is provided on the base plate (221) between two adjacent air guide plates (223), and the grass cutting blade (23) is provided with a second ventilation hole (232) for communicating with the first ventilation hole (2211). The wind base plate (221) is provided with two positioning posts (2212) arranged diagonally, the grass cutting blade (23) is provided with two first positioning holes (233) arranged diagonally, and the grass cutting blade (23) is provided with a second positioning hole (234) arranged adjacent to the first positioning hole (233). The first positioning hole (233) and the second positioning hole (234) are both used for insertion and positioning with the positioning posts (2212); When the positioning pin (2212) is inserted into the first positioning hole (233), the first ventilation hole (2211) and the second ventilation hole (232) are connected; when the positioning pin (2212) is inserted into the second positioning hole (234), the first ventilation hole (2211) and the second ventilation hole (232) are not connected. The rotating platform (222) is provided with a stepped through groove (2221), the drive shaft (211) of the mowing motor (21) is inserted into the through groove (2221), the mowing blade (23) is provided with a through hole (231) corresponding to the through groove (2221), and a fastening screw (24) is inserted through the through hole (231). The fastening screw (24) passes through the through hole (231) and the through groove (2221) in sequence and is threadedly connected to the drive shaft (211) of the mowing motor (21) so that the fan disc (22) and the mowing blade (23) are fastened to the drive shaft (211); The air-guiding plate (223) is provided with a first air-guiding surface (2231), a second air-guiding surface (2232) and a third air-guiding surface (2233) in sequence along the direction away from the rotating platform (222). The height of the first air-guiding surface (2231), the second air-guiding surface (2232) and the third air-guiding surface (2233) gradually increases in the vertical direction. The bottom plate (221) is provided with at least one air guide plate (224) located between two adjacent air-guiding plates (223). The air guide plate (223) is provided with a first air guide hole (2234), a second air guide hole (2235) and a third air guide hole (2236). The height of the first air guide hole (2234), the second air guide hole (2235) and the third air guide hole (2236) gradually increases in the vertical direction. The air guide plate (224) is provided with at least one air guide hole (2241). When the mowing motor (21) drives the fan disc (22) and the mowing blade (23) to rotate synchronously, a semi-enclosed airflow channel is formed in the retaining ring (11) of the housing (10), and the airflow generated by the fan disc (22) partially counteracts the vertical upward negative pressure generated by the mowing blade (23).

2. The lawnmower for gardens according to claim 1, characterized in that, The housing (10) has a discharge chamber (12) inside, which is connected to the side wall of the housing (10). A baffle (40) is hinged on the housing (10) to block the outlet of the discharge chamber (12).

3. The lawnmower for gardens according to claim 1 or 2, characterized in that, The bottom plate (221), the rotating platform (222), and the air guide plate (223) are integrally formed. One end of the air guide plate (223) is connected to the rotating platform (222), and the other end of the air guide plate (223) does not extend out of the bottom plate (221).

4. The lawnmower for gardens according to claim 3, characterized in that, The air guide plate (224) and the third air-guiding surface (2233) are at the same height in the vertical direction, and the air guide plate (224) and the rotating platform (222) are spaced apart.

5. The lawnmower for gardens according to claim 1, characterized in that, The pushing assembly (30) includes four movable wheels (31) rotatably connected to the four corners of the housing (10). The housing (10) is fixedly mounted with relatively distributed first pushing rods (32). The first pushing rods (32) are connected to second pushing rods (33). The first pushing rods (32) and the second pushing rods (33) are fixedly connected by a locking handle (34).

6. The lawnmower for gardens according to claim 5, characterized in that, Each pair of movable wheels (31) is covered with a movable track (35). Each movable wheel (31) has two movable teeth (311) symmetrically arranged on its outer wall. The movable track (35) has gear grooves (351) and gear protrusions (352) that are adapted to the movable teeth (311). The gear grooves (351) and gear protrusions (352) are arranged alternately. The outer wall of the movable track (35) has a number of movable protrusions (353).

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