A safety protection structure and a lawn mower

Abstract

The present invention discloses a safety protection structure and a lawn mower. The safety protection structure is disposed between the inner side of the outer housing and the outer side of the cutting unit, and includes: a protective cover, located at the bottom of the protection structure; a floating assembly, the protective cover is connected to the outer housing through the floating assembly, and the protective cover moves up and down through the floating assembly; when the cutting height of the cutting unit is higher than or equal to a first height, the lower edge of the protective cover remains at a second height position unchanged; when the cutting unit moves downward to a cutting height lower than the first height, the protective cover moves downward synchronously with the cutting unit to ensure that the protective cover is more than 10 mm lower than the lawn mowing height.

Description

Technical Field

[0001] The present invention relates to a lawn mower, specifically a safety protection structure and a lawn mower. Background Art

[0002] The working unit of a lawn mowing robot is a high-speed rotating cutter head, and sharp blades are arranged on the cutter head. Therefore, an effective protection structure needs to be provided for the cutting unit on the lawn mower to prevent harm to the user.

[0003] Currently, most of the protection structures are to reduce the height of the outer shell or fix additional protection structures on the main housing. Reducing the height of the housing improves safety but sacrifices the performance of the lawn mower. When the lawn mower encounters tall and dense grass during operation, the resistance increases significantly, and the driving wheels of the machine slip, not only losing the effective mowing performance of the lawn mower but also damaging the lawn.

[0004] Currently, there is also a protection structure arranged on the lower housing of the lawn mower, and the protection structure is designed to be floating. This protection structure is effective during laboratory tests. When the lawn mower is actually working, the grass in the field will exert an upward force on the protection structure, causing the protection structure to float automatically, resulting in an increase in the distance between the protection structure and the ground, and this distance is very likely to exceed the size of the safety regulation test finger, and the protection function is lost at this time.

[0005] Currently, another protection structure adopts the cooperation of internal and external protections corresponding to different safety regulation test items.

[0006] The existing safety protection structures of lawn mowers either increase the difficulty of mowing and greatly reduce the efficiency, or adopt a double protection structure, increasing the number of parts and raising the cost. The present invention designs a new safety protection structure that can effectively reduce the resistance of grass to the lawn mower when the lawn mower encounters tall and dense grass. At the same time, a single protection structure is adopted to reduce the number of parts. Summary of the Invention

[0007] In view of the above technical problems, the present invention proposes a safety protection structure, which is arranged on the outside of the cutting unit and the inside of the outer housing. When the mowing height is greater than a certain preset height, the distance between this protection structure and the ground remains unchanged, and its height from the ground is set to be less than the specified height. When the mowing height is adjusted below the preset height, the height of this protection structure from the ground can be adjusted simultaneously with the height of the cutter head, ensuring that the protective cover is more than 10 mm lower than the mowing height.

[0008] In order to achieve the above technical objectives, the present invention adopts the following technical means: A safety protection structure is arranged between the inside of the outer housing and the outside of the cutting unit, including:

[0009] A protective cover, located at the bottom of the protection structure;

[0010] A floating assembly, wherein the protective cover is connected to the outer shell through the floating assembly, and the protective cover is moved up and down through the floating assembly;

[0011] When the cutting height of the cutting unit is higher than or equal to the first height, the lower edge of the protective cover remains at the second height position unchanged;

[0012] When the cutting unit descends to a cutting height lower than the first height, the protective cover moves downward synchronously with the cutting unit.

[0013] The floating assembly includes: a floating bracket, which is arranged on the upper part of the protective cover and is fixedly connected to the protective cover;

[0014] A fixed bracket, fixedly connected to the outer shell;

[0015] An elastic unit, arranged between the floating bracket and the fixed bracket;

[0016] When the cutting height of the cutting unit is higher than the first height, under the elastic force of the elastic unit, the protective cover fixedly connected to the floating bracket can be arranged around the cutting unit at the second height and cover all movement tracks of the blade on the cutting unit;

[0017] When the cutting unit moves downward relative to the outer shell, the cutting unit can touch the floating bracket and overcome the elastic force of the elastic unit, thereby driving the floating bracket and the protective cover to move downward synchronously.

[0018] The first height is higher than the second height, the second height is not less than 38 mm, and the difference between the first height and the second height is not less than 5 mm.

[0019] An annular cavity is provided on the outer shell around the motor sleeve; one side of the fixing bracket is fixedly connected to the inner wall of the annular cavity, and a lower limit portion is provided at the bottom of the fixing bracket;

[0020] The bottom of the floating bracket is fixedly connected to the protective cover, the upper end of the floating bracket extends into the annular cavity and is slidably connected to the outer wall of the annular cavity, and the top of the floating bracket is provided with an upper limit portion;

[0021] The elastic unit is disposed in the annular cavity and is located between the lower limiting portion and the upper limiting portion.

[0022] A disc-shaped abutment extending in the direction of the housing is fixedly connected to the cutting unit above the cutter disc, and the disc-shaped abutment can move synchronously with the cutter disc; an annular stopper extending in the direction of the cutting unit is provided on the protective cover;

[0023] When the cutting unit moves downward relative to the outer housing, the disc-shaped contact member can contact the annular limiting member on the protective cover, thereby overcoming the elastic force of the elastic unit and driving the protective cover to move downward synchronously.

[0024] It further includes a horizontal rotation support member disposed between the upper limit portion of the floating bracket and the elastic unit, enabling the protective cover to freely rotate relative to the outer housing about the central axis of the protective cover.

[0025] The horizontal rotation support member includes: a bearing and an inner ring bracket of the bearing. Among them, the outer ring of the bearing is in interference fit with the inner wall of the top of the floating bracket, and the inner ring of the bearing is in interference fit with the inner ring bracket of the bearing;

[0026] The bottom of the inner ring bracket of the bearing is in contact connection with the top end of the elastic unit.

[0027] The elastic unit is a spring.

[0028] The protective cover is a mesh structure.

[0029] A lawn mower adopts the safety protection structure described above.

[0030] Beneficial effects: First. A safety protection structure of the present invention includes a floating bracket, a fixed bracket, and an elastic unit disposed between the floating bracket and the fixed bracket. A protective cover is fixedly installed at the bottom of the floating bracket. When the mowing height is greater than or equal to the preset mowing height, the distance between the protective cover and the ground remains unchanged; when the mowing height is less than the preset mowing height, the cutting unit can touch the floating bracket and overcome the elastic force of the elastic unit, driving the floating bracket and the protective cover to move downward synchronously. During the entire up and down movement of the cutting unit, it is always ensured that it is within the coverage range of the protective cover, improving safety. At the same time, since the height space that the cutting unit can adjust is relatively large, and its maximum height can reach 60 mm. With the design of the present application, when the cutting unit rises to a relatively high height, the protective cover can remain at a certain height and no longer rise with the cutting unit. When an object accidentally enters the bottom of the lawn mower, the protective cover can block the object from entering the working area of the cutting unit.

[0031] Second. During the entire movement process of the cutting unit and the protective cover, adopting this structure can always ensure that the protective cover is lower than the mowing height by a certain height. Moreover, since the diameter of the protective cover itself is larger than the working radius of the cutting unit, it can also prevent the bent fingers from touching the cutting unit when a child accidentally inserts an arm into the bottom of the lawn mower, avoiding harm to the child.

[0032] Thirdly, the protective structure disclosed by the present invention can be independently assembled as a whole module and combined with a lawn mower device. It can be adapted to different models of lawn mowers, having good applicability. At the same time, the independent modular structure can better reduce the assembly difficulty and the difficulty of spare parts management.

[0033] Other features and advantages of the present invention will be described in the following specification, and, in part, will become apparent from the specification or will be understood by implementing the present invention. Brief Description of the Drawings

[0034] Figure 1 is an exploded view of the overall structure of the lawn mower of the present invention;

[0035] Figure 2 is a sectional view of the overall structure of the lawn mower of the present invention;

[0036] Figure 3 is a sectional view of the assembly of the protective structure and the lower housing of the present invention;

[0037] Figure 4 is an exploded view of the protective structure of the present invention;

[0038] Figure 5 is a sectional view of the assembly of the protective structure when the mowing height of the present invention is greater than 45 mm;

[0039] Figure 6 is a sectional view of the assembly of the protective structure when the mowing height of the present invention is less than 45 mm.

[0040] The reference numerals are: 1, upper housing; 2, lower housing; 3, protective structure; 301, floating bracket; 302, bearing; 303, fixed bracket; 304, spring; 305, protective cover; 306, bearing inner ring bracket; 4, cutting unit. Detailed Description of the Invention

[0041] To make the objectives and technical solutions of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the drawings of the embodiments of the present invention. Obviously, the described embodiments are some but not all of the embodiments of the present invention. Based on the described embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the scope of protection of the present invention.

[0042] Those skilled in the art can understand that, unless otherwise defined, all terms used herein (including technical and scientific terms) have the same meaning as the general understanding of those of ordinary skill in the art to which the present invention pertains. It should also be understood that terms such as those defined in a general dictionary should be understood to have a meaning consistent with their meaning in the context of the prior art, and will not be interpreted with idealized or overly formal meanings unless defined as such herein.

[0043] As used in the present invention, the meaning of "and / or" includes both the case where each exists alone and the case where both exist simultaneously.

[0044] As used in the present invention, the meaning of "inside and outside" refers to, relative to the signal line itself, the direction pointing from the signal line to the inside of the working area as inside, and vice versa; it is not a specific limitation on the device mechanism of the present invention.

[0045] As used in the present invention, the meaning of "connection" can be a direct connection between components or an indirect connection between components through other components.

[0046] The present invention discloses a safety protection structure, which is used for gardening tools such as lawn mowers and lawn mowing robots. This safety protection structure is arranged between the inner side of the outer housing of the main body and the outer side of the cutting unit, and includes a protective cover. During the working process, when the cutting height of the cutting unit is higher than or equal to a preset first height, the lower edge of the protective cover remains at the second height position unchanged; when the cutting unit descends to a cutting height lower than the preset first height, the protective cover can move downward synchronously with the cutting unit. During the entire movement process, the protective cover always covers the cutting unit, playing a good protective role. In actual use, the first height is higher than the second height, the second height is not less than 38 mm, and the difference between the first height and the second height is not less than 5 mm. The following uses specific embodiments to illustrate this technical solution. In this embodiment, the first height is set to 45 mm, the second height is set to 35 mm, and the difference between the first height and the second height is 10 mm.

[0047] As Figure 1 shown is an exploded view of the overall structure of a lawn mowing robot, including an upper housing 1, a lower housing 2, a protection structure 3, and a cutting unit 4. The upper housing 1 and the lower housing 2 form the entire body main body. Other components such as electronic components and driving components inside the body main body are not described in detail here. The protection structure 3 and the cutting unit 4 are described in detail in the illustration and the following embodiments.

[0048] As Figure 2 shown is a sectional view of the overall structure of a lawn mower. The protection structure 3 and the cutting unit 4 are both assembled to the lower housing 2. After the upper housing 1 and the lower housing 2 are assembled, it is the whole lawn mowing robot. By Figure 1 and Figure 2It can be seen that the protection component 3 can be directly assembled with the lawn mower robot as an integral component. In the actual assembly process, the protection component 3 can be assembled independently first, and then the overall assembly of the lawn mower robot can be completed, which can simplify the assembly steps and improve the assembly efficiency. At the same time, different models of lawn mower robots can adapt to the protection component 3 through minor modifications, so that the protection component 3 has better applicability.

[0049] like Figure 3 The figure shows a cross-sectional view of the protective structure and the lower shell assembly of the present invention. The protective structure 3 is directly assembled to the lower shell 2, and a spring 304 is arranged between the fixing bracket 303 and the lower shell 201.

[0050] like Figure 4 This is an exploded view of the protective structure, which includes a floating bracket 301; a bearing 302; a fixed bracket 303; a spring 304; a protective cover 305; and a bearing inner ring bracket 306.

[0051] Figure 5 The protective structure is assembled in a cross-sectional view when the mowing height is greater than 45 mm. The outer ring of the bearing 302 is interference-fitted to the floating bracket 301, and the inner ring of the bearing 302 is interference-fitted to the bearing inner ring bracket 306. The entire protective structure is fixed to the lower shell 201 through the fixed bracket 303, and a spring 304 is arranged in the middle.

[0052] The protective cover 305 is fixed to the floating bracket 301 by screws and can rotate freely. At this time, when the mowing height is greater than 45 mm, the cutting unit 4 does not contact the protective cover 305. The entire protective structure is close to the lower shell 201 under the action of the spring, and the distance of the protective structure from the ground is unchanged.

[0053] Figure 6 3 is a cross-sectional view of the protective structure when the mowing height is less than 45 mm. At this time, the mowing height is less than 45 mm, and the cutting unit 4 has contacted the protective cover 305. As can be seen from the figure, the cutting unit 4 includes a power element and a cutting part arranged at the output end of the power element. The cutting part can be a blade, a cutter disc, etc. Specifically in this embodiment, the power element is a motor, the cutting part is a cutter disc, and a contact part that does not rotate with the motor is arranged at the output end of the motor.

[0054] When the height is lowered, the contact parts on the cutting unit 4 are pressed onto the protective cover 305, driving the protective structure to be lowered synchronously; specifically: a disc-shaped abutment extending toward the housing is fixedly connected to the cutting unit above the cutter disc, and the disc-shaped abutment can move synchronously with the cutter disc;

[0055] The protective cover is provided with an annular limiting member extending in the direction of the cutting unit;

[0056] When the cutting unit moves downward relative to the outer housing, the disc-shaped contact member can contact the annular limiting member on the protective cover, thereby overcoming the elastic force of the elastic unit and driving the protective cover to move downward synchronously.

[0057] When the height is adjusted upward, under the elastic force of the spring, the protective cover 305 is adjusted upward synchronously. In this way, it can be ensured that the distance between the protective cover and the ground is more than 10 mm lower than that of the cutting unit.

[0058] In this structure, the entire bearing part is covered in the floating bracket and the inner ring bracket, which has good protection for the bearing. At the same time, the spring presses the inner ring bracket to provide a supporting force for the bearing, so that the bearing force is more stable and the protective cover is smoother during rotation.

[0059] When the cutting height of the cutting unit decreases, the contact part on the cutting unit contacts the inner ring of the protective cover, and the protective cover is as Figure 4 shown. The inner ring at the top of the protective cover extends towards the middle. The lower part of the protective cover is a cover body structure, and the protective cover is connected to the floating bracket through the top. When the cutting unit descends to a certain height, the contact part contacts the inner ring of the protective cover and pushes the protective cover downward. Since the protective cover can rotate itself, in order to prevent the contact part from affecting the rotation of the protective cover after contacting the protective cover, the contact part can be fixed to the output end of the motor by a rotational connection method, or the contact part and the protective cover are in contact by a point contact or a line contact method.

[0060] Taking point contact as an example, a number of uniformly distributed spherical protrusions are provided on the contact part, and the spherical protrusions contact the inner ring of the protective cover; taking line contact as an example, a number of cylindrical protrusions are provided on the contact part, and the arc surface of the cylindrical protrusions contacts the inner ring of the protective cover.

[0061] Both the point contact and the line contact methods can reduce the contact area and reduce the resistance of the protective cover to rotate.

Claims

1. A safety protection structure is provided between the inner side of the outer housing and the outer side of the cutting unit, and is characterized in that: Comprising: A protective cover, located at the bottom of the protection structure; A floating component, the protective cover and the outer housing are connected through the floating component, and the protective cover realizes up and down movement through the floating component; When the cutting height of the cutting unit is higher than or equal to the first height, the lower edge of the protective cover remains at the second height position unchanged; When the cutting unit moves downward to a cutting height lower than the first height, the protective cover moves downward synchronously with the cutting unit; The floating component includes: a floating bracket, arranged on the upper part of the protective cover and fixedly connected to the protective cover; A fixed bracket, fixedly connected to the outer housing; An elastic unit, arranged between the floating bracket and the fixed bracket; When the cutting height of the cutting unit is higher than the first height, under the elastic force of the elastic unit, the protective cover fixedly connected to the floating bracket can be at the second height, surround the cutting unit and cover all the movement tracks of the upper blade of the cutting unit; When the cutting unit moves downward relative to the outer housing, the cutting unit can touch the floating bracket and overcome the elastic force of the elastic unit, driving the floating bracket and the protective cover to move downward synchronously together; The elastic unit is a spring; The protective cover is a mesh structure; The first height is higher than the second height, the second height is not less than 38 mm, and the difference between the first height and the second height is not less than 5 mm.

2. The safety protection structure according to claim 1, characterized in that, An annular cavity is provided around the motor sleeve on the outer housing; One side of the fixed bracket is fixedly connected to the inner wall of the annular cavity, and a lower limit part is provided at the bottom of the fixed bracket; The bottom of the floating bracket is fixedly connected to the protective cover, the upper end of the floating bracket extends into the annular cavity and is slidably connected to the outer wall of the annular cavity, and an upper limit part is provided at the top of the floating bracket; The elastic unit is arranged in the annular cavity and is located between the lower limit part and the upper limit part; 3. The safety protection structure according to claim 1, characterized in that, A disc-shaped abutting member extending towards the machine housing is fixedly connected above the cutter head in the cutting unit, and the disc-shaped abutting member can move synchronously with the cutter head; An annular limiting member extending towards the cutting unit is provided on the protective cover; When the cutting unit moves downward relative to the outer housing, the disc-shaped abutting member can contact the annular limiting member on the protective cover, thereby overcoming the elastic force of the elastic unit and driving the protective cover to move downward synchronously together; 4. The safety protection structure according to claim 2, characterized in that, It further includes a horizontal rotation support member, arranged between the upper limit part of the floating bracket and the elastic unit, so that the protective cover can freely rotate relative to the outer housing around the central axis of the protective cover; 5. The safety protection structure according to claim 4, characterized in that, The horizontal rotation support member includes: a bearing and a bearing inner ring bracket, wherein, the outer ring of the bearing is in interference fit with the inner wall of the top of the floating bracket, and the inner ring of the bearing is in interference fit with the bearing inner ring bracket; The bottom of the bearing inner ring bracket is in abutting connection with the top end of the elastic unit; 6. A lawn mower, characterized in that, Adopt the safety protection structure as described in any one of claims 2 to 5.

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