A self-balancing scooter

Abstract

The present invention discloses a self-balancing scooter, which comprises a first vehicle body and a second vehicle body. The first vehicle body includes a first upper shell and a first lower shell. The second vehicle body includes a second upper shell, a middle shell and a second lower shell, and the middle shell is arranged between the second upper shell and the second lower shell; a second axle mounting seat is provided on the second upper shell. The advantages are that arranging the second axle mounting seat on the second upper shell facilitates production and processing; at the same time, the connection between the second upper shell and the middle shell is made closer and the installation is stable.

Description

Technical Field

[0001] The present invention relates to the technical field of self-balancing scooters, and particularly to a self-balancing scooter. Background Art

[0002] The operating principle of an electric self-balancing scooter is mainly based on a basic principle called "dynamic stability". It uses gyroscopes and acceleration sensors inside the vehicle body to detect changes in the vehicle body posture, and uses a servo control system to drive the axles to make corresponding adjustments to maintain the balance of the system. It is a new type of green and environmentally friendly product for modern people to use as a means of transportation and for leisure and entertainment. Electric self-balancing scooters mainly include two types: single-wheel and two-wheel. Among them, the two-wheel self-balancing scooter has a higher safety factor and is more suitable for commuting. The wheels are connected to the vehicle body of the two-wheel self-balancing scooter, and the installation of the axles of the wheels plays an important role in the stable operation of the entire vehicle body. Summary of the Invention

[0003] In order to overcome the deficiencies of the prior art, the purpose of the present invention is to provide a self-balancing scooter, which is beneficial to maintaining the balance of the vehicle body, has stronger overall stability and is safer to use.

[0004] The purpose of the present invention is achieved by adopting the following technical solutions:

[0005] A self-balancing scooter includes a first vehicle body and a second vehicle body. The first vehicle body includes a first upper shell and a first lower shell. The second vehicle body includes a second upper shell, a middle shell and a second lower shell. The middle shell is arranged between the second upper shell and the second lower shell; a second axle mounting seat is provided on the second upper shell.

[0006] Preferably, a second wheel is connected to the second vehicle body. The second wheel includes a second axle, and the second axle is connected to the second upper shell; the second axle is located below the middle shell; a through groove is provided on the middle shell, and the second axle mounting seat passes through the through groove and is connected to the second axle.

[0007] Preferably, the second axle mounting seat includes a second axle pressing plate fixing hole and a second axle mounting groove; there are two groups of the second axle pressing plate fixing holes, and the two groups of the second axle pressing plate fixing holes are symmetrically arranged on both sides of the second axle mounting groove.

[0008] Preferably, a second control board connecting column is arranged on the lower side of the middle shell, and the second control board connecting column is correspondingly arranged outside the second axle mounting seat.

[0009] Preferably, there are two groups of the second control board connecting columns, and the two groups of the second control board connecting columns are respectively correspondingly arranged on both sides of the second axle mounting seat, on both sides of the through groove of the middle shell.

[0010] Preferably, the through groove on the middle shell has an opening facing the second wheel, and the opening is for the second axle to pass through.

[0011] Preferably, the scooter further includes a rotating mechanism. The first end of the rotating mechanism is connected to the first vehicle body, and the second end of the rotating mechanism is connected to the second vehicle body; the second end of the rotating mechanism is rotatably connected to the second upper shell.

[0012] Preferably, a rotating upper connection groove is provided on the second upper shell, and a rotating lower connection groove is provided on the second lower shell. The second end of the rotating mechanism is clamped between the rotating upper connection groove and the rotating lower connection groove and is rotatably connected to the second vehicle body.

[0013] Preferably, a rotating mechanism fixing groove is provided on one side of the first upper shell and / or the first lower shell close to the middle shell; the second end of the rotating mechanism is fixedly arranged between the first upper shell and the first lower shell through the rotating mechanism fixing groove; or

[0014] A rotating mechanism fixing post is provided on one side of the first upper shell and / or the first lower shell close to the middle shell; the second end of the rotating mechanism is fixedly arranged between the first upper shell and the first lower shell through the rotating mechanism fixing post.

[0015] Preferably, a first axle mounting seat is provided on the first upper shell or the first lower shell. The first axle mounting seat includes a first axle pressing piece fixing hole and a first axle mounting groove; there are two groups of the first axle pressing piece fixing holes, and the two groups of the first axle pressing piece fixing holes are symmetrically arranged on both sides of the first axle mounting groove; a first control board connecting post is provided on the first upper shell or the first lower shell; there are two groups of the first control board connecting posts, and the two groups of the first control board connecting posts are respectively arranged on both sides of the first axle mounting seat.

[0016] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0017] In the present invention, the second axle mounting seat is arranged on the second upper shell, so that the difference between the second upper shell and the original structure is small, which is convenient for modification and production assembly, and is also beneficial to simplifying the structure of the middle shell. At the same time, the middle shell is more tightly connected to the second shell, making the mechanical strength of the second vehicle body better and more stable. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 is an exploded structural schematic diagram of the scooter according to an embodiment of the present invention;

[0019] Figure 2 is an exploded structural schematic diagram of the scooter from another angle according to an embodiment of the present invention;

[0020] Figure 3Schematic cross-sectional structure diagram of the self-balancing scooter according to an embodiment of the present invention;

[0021] Figure 4 Schematic structure diagram of the middle shell according to an embodiment of the present invention;

[0022] Figure 5 Schematic structure diagram of the middle shell from another angle according to an embodiment of the present invention;

[0023] Figure 6 Schematic structure diagram of the second upper shell according to an embodiment of the present invention;

[0024] Figure 7 Schematic structure diagram of the second lower shell according to an embodiment of the present invention.

[0025] In the figure: 1, the first vehicle body; 2, the second vehicle body; 3, the rotating mechanism; 31, the first end; 32, the second end; 33, the rotating shaft; 34, the limiting part; 35, the bearing; 36, the rotating mechanism fixing hole; 37, the limiting block; 38, the limiting block mounting groove; 4, the first control board; 5, the second control board; 10, the first upper shell; 101, the rotating mechanism fixing groove; 102, the rotating mechanism fixing column; 103, the first axle mounting seat; 104, the first axle pressing piece fixing hole; 105, the first axle mounting groove; 106, the first control board connecting column; 20, the first lower shell; 30, the second upper shell; 301, the rotating upper connecting groove; 302, the second axle mounting seat; 303, the second axle pressing piece fixing hole; 304, the second axle mounting groove; 305, the indicator light board; 306, the light board column; 307, the indicator light hole; 308, the lamp cover; 309, the second axle pressing piece; 40, the second lower shell; 401, the rotating lower connecting groove; 50, the middle shell; 501, the through groove; 502, the second control board connecting column; 60, the first wheel; 601, the first axle; 602, the first axle pressing piece; 70, the second wheel; 701, the second axle. Detailed implementation manners

[0026] The present invention will be described in more detail below with reference to the accompanying drawings. It should be noted that the description of the present invention with reference to the accompanying drawings below is illustrative only and not restrictive. Various different embodiments can be combined with each other to form other embodiments not shown in the following description.

[0027] In the description of the present invention, it should be noted that for orientation terms, such as the terms "center", "lateral", "longitudinal", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc., the indicated orientation and position relationships are based on the orientation or position relationships shown in the drawings. This is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and should not be construed as limiting the specific protection scope of the present invention.

[0028] In addition, for terms such as "first" and "second", they are only used for descriptive purposes and cannot be construed as indicating or implying relative importance or implicitly specifying the quantity of technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present invention, the meaning of "several" is two or more, unless otherwise specifically defined.

[0029] In the present invention, unless otherwise clearly specified and limited, for terms such as "assembled", "connected", and "joined", they should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can also be a mechanical connection; it can be directly connected, or connected through an intermediate medium, and can be internally connected and communicated between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0030] See the attached Figure 1 to the attached Figure 7 , the self-balancing scooter of the embodiment of the present invention will be clarified in the following description. Among them, the second control board is directly connected to the second upper shell, with a simpler structure, easier to assemble, less prone to errors, and can also make the connection between the second upper shell and the middle shell tighter, improving the mechanical strength of the second vehicle body.

[0031] As shown in the attached Figure 1 and the attached Figure 2 , the self-balancing scooter of the present invention includes a first vehicle body and a second vehicle body, characterized in that: the first vehicle body includes a first upper shell and a first lower shell, the second vehicle body includes a second upper shell, a middle shell, and a second lower shell, and the middle shell is disposed between the second upper shell and the second lower shell; a second axle mounting seat is provided on the second upper shell.

[0032] In one embodiment, as shown in the attached Figure 1 and the attached Figure 2 , the first end of the rotating mechanism is fixedly disposed between the first upper shell and the first lower shell; the second end of the rotating mechanism is rotatably disposed between the second upper shell and the second lower shell.

[0033] When the second axle mounting seat is disposed on the second upper shell, the second axle mounting seat 302 includes a second axle pressure plate fixing hole 303 and a second axle mounting groove 304. The second axle mounting groove 304 is adapted to fit the second axle, and the second axle is mounted in the second axle mounting groove. The second axle pressure plate fixing holes 303 include two groups, symmetrically arranged on either side of the second axle mounting groove 304. The second axle mounting seat 302 is also provided with a second axle pressure plate 309, which secures the second axle in the second axle mounting groove. The second axle pressure plate 309 is fixedly connected to the second axle mounting seat 302 via screws, ensuring that the second axle will not fall out of the second axle mounting groove.

[0034] Since the middle shell 50 is arranged below the second upper shell 30, the second axle mounting seat 302 arranged on the lower surface of the second upper shell 30 is easy to interfere with the middle shell 50. Therefore, based on this embodiment, preferably, as shown in the attached Figure 1 and attached Figure 4 As shown, the middle shell 50 is provided with a through-slot 501. The second axle mounting seat 302 passes through the through-slot 501 and is positioned below the middle shell 50, avoiding interference with the middle shell 50. At this point, the second axle is also positioned below the middle shell 50. The second axle mounting seat 302 secures the second axle in the second axle mounting slot 304 via the second axle pressing plate 309. The placement of the second axle mounting seat 302 on the second upper shell 30, compared to existing upper shell structures, only eliminates the second control board connection post and second contact through-hole on the second upper shell 30. This makes the second upper shell 300 minimally different from the existing structure, allowing manufacturers to directly retrofit existing upper shell structures, simplifying the production process, avoiding waste, and facilitating installation of the second upper shell 30 and the second axle. Preferably, the through-slot 501 on the middle shell 50 opens toward the second wheel, allowing the second upper shell 30 and the second axle to be installed first, and then the second axle mounting seat 302 to be directly inserted through the through-slot 501, making installation simpler and more convenient. At the same time, the second axle mounting seat 302 and the second upper shell 30 are equivalent to clamping the middle shell 50 therebetween, so that the middle shell 50 and the second shell are connected more tightly, making the mechanical strength of the second body 2 better and more stable.

[0035] A second control board connecting column 502 is provided on the lower side of the middle shell, and the second control board 5 is fixedly connected to the middle shell 50 via the second control board connecting column 502. To make the installation of the second control board 5 more secure, the second control board connecting column 502 includes two groups. The two groups of second control board connecting columns 502 are respectively arranged on both sides of the second axle mounting seat 302 to prevent the second control board 5 from interfering with the second axle mounting seat 302.

[0036] In some embodiments, the scooter further includes a rotating mechanism. The first end of the rotating mechanism is connected to the first vehicle body, and the second end of the rotating mechanism is connected to the second vehicle body; the second end of the rotating mechanism is rotatably connected to the second upper shell. A limiting mechanism is provided on the second upper shell 30 and / or the second lower shell 40. The limiting mechanism is adapted to a limiting portion 34 on the rotating shaft 33 to limit the rotation angle of the rotating shaft 33. The first vehicle body 1 and the second vehicle body 2 rotate about the axis of the rotating shaft 33. The limiting mechanism includes a limiting block 37 and a limiting block mounting groove 38. The limiting mechanism is located between the second upper shell 30 and the second lower shell 40. Therefore, the limiting block mounting groove 38 can be provided on the second lower shell 40, or on the lower surface of the second upper shell 30, or both the second lower shell 40 and the second upper shell 30 can be provided with the limiting block mounting groove 38. In the specific example shown in the attached Figure 1 and the attached Figure 3 In the specific example shown in the attached figures, the limiting block mounting groove 38 is provided on the second lower shell 40. One end of the rotating shaft 33 located between the middle shell 50 and the second lower shell 40 is provided with a limiting portion 34. The limiting portion 34 includes a limiting boss with a notch. The limiting block 37 is a limiting piece corresponding to the limiting boss, and the top surface of the limiting piece can respectively abut against both ends of the limiting boss when the rotating shaft 33 rotates, so as to limit the rotation angle of the rotating shaft 33.

[0037] A second sleeve (not shown) or a bearing 35 is sleeved on the second end of the rotating mechanism, that is, the end of the rotating shaft 33 placed between the second upper shell 30 and the second lower shell 40. Correspondingly, a rotating upper connection groove 301 is provided on the second upper shell 30, and a rotating lower connection groove 401 is provided on the second lower shell 40. The rotating upper connection groove 301 and the rotating lower connection groove 401 are oppositely arranged. And in order to install the bearing 35 or the second sleeve, limiting grooves are provided in the rotating upper connection groove 301 and the rotating lower connection groove 401. More specifically, when a bearing 35 is sleeved on the rotating shaft 33, bearing limiting grooves are provided in the rotating upper connection groove 301 and the rotating lower connection groove 401; when a second sleeve is sleeved on the rotating shaft 33, sleeve limiting grooves are provided in the rotating upper connection groove 301 and the rotating lower connection groove 401. The rotating shaft 33 can rotate in the second sleeve or the bearing 35, so that the first vehicle body 1 and the second vehicle body 2 can rotate relative to each other.

[0038] The first vehicle body 1 and the second vehicle body 2 are connected by a rotating mechanism 3. In order to facilitate the user to observe the working condition of the scooter, the scooter further includes an indicator light board 305. The indicator light board 305 is connected to the control circuit board and can feedback the working state of the scooter through the light-emitting devices thereon. In order to maintain the pedaling balance of the scooter, pedals are provided on both the first vehicle body 1 and the second vehicle body 2 for the user to step on. In order to prevent the user from blocking the light of the light-emitting devices, the indicator light board 305 is arranged at the connection of the first vehicle body 1 and the second vehicle body 2, that is, at the position corresponding to the rotating mechanism 3, as shown in the attached Figure 1 and the attached Figure 3As shown, the indicator light board 305 is arranged below the position corresponding to the second end 32 of the rotating mechanism 3 on the second upper shell 30. More specifically, the indicator light board 305 is located in the rotating upper connecting groove 301. The rotating upper connecting groove 301 is provided with a light board post 306 and an indicator light hole 307. The light board post 306 is used to install the indicator light board 305, and the indicator light hole 307 is used to transmit the light of the light-emitting device on the indicator light board 305. The position of the indicator light hole 307 corresponds to the light-emitting device on the indicator light board 305. The light-emitting device can be an LED lamp bead or other small lamps. A lamp shade 308 is covered on the indicator light hole 307.

[0039] In the embodiment where the first end 31 of the above-mentioned rotating mechanism 3 is fixedly arranged in the first vehicle body 1, the connection structure between the first end 31 of the rotating mechanism 3 and the first upper shell 10 and the first lower shell 20 can be: a rotating mechanism fixing groove 101 is arranged at one end of the first upper shell 10 close to the second upper shell 30. Correspondingly, a rotating mechanism fixing groove 101 is arranged at one end of the first lower shell 20 close to the second lower shell 40. The rotating mechanism 3 is fixed between the rotating mechanism fixing groove 101 and the rotating mechanism fixing groove 101. After the rotating mechanism fixing groove 101 and the rotating mechanism fixing groove 101 are connected and fixed on the first upper shell 10 and the first lower shell 20, a fixing groove fixedly connected to the first end 31 of the rotating mechanism 3 is formed. The fixing groove can limit the relative rotation of the first end 31 of the rotating mechanism 3 and the first vehicle body 1, so that the first vehicle body 1 and the second vehicle body 2 can rotate relative to each other smoothly. The connection structure between the first end 31 of the rotating mechanism 3 and the first upper shell 10 and the first lower shell 20 can also be: a rotating mechanism fixing post 102 is arranged at one end of the first upper shell 10 close to the second upper shell 30. A rotating mechanism fixing hole 36 is provided on the first end 31 of the rotating mechanism 3. The shape of the rotating mechanism fixing post 102 is adapted to that of the rotating mechanism fixing hole 36. The rotating mechanism 3 is fixed between the first upper shell 10 and the first lower shell 20 through the rotating mechanism fixing post 102. During installation, the rotating mechanism fixing post 102 passes through the rotating mechanism fixing hole 36, so that the first end 31 of the rotating mechanism 3 is fixedly connected to the first vehicle body 1 and is relatively stationary, thereby enabling the first vehicle body 1 and the second vehicle body 2 to rotate relative to each other smoothly; the rotating mechanism fixing hole 36 can be a through structure or a non-through structure. When the rotating mechanism fixing hole 36 is a through structure, rotating mechanism fixing posts 102 can be arranged at the corresponding positions of the first upper shell 10 and the first lower shell 20; when the rotating mechanism fixing hole 36 is a non-through structure, a rotating mechanism fixing post 102 is arranged at the corresponding position of the first upper shell 10 or the first lower shell 20, and the rotating mechanism fixing post 102 is arranged towards the rotating mechanism fixing hole 36 so that it can be inserted into the rotating mechanism fixing hole 36.

[0040] Based on the above embodiment, the second axle 701 and the second end 32 of the rotating mechanism 3 are connected to the same platform, which can make the rotating mechanism 3 and the second wheel 70 rotate more smoothly. More specifically, when the second axle mounting base 302 is disposed on the second upper shell 30 and the second axle 701 is connected to the second upper shell 30, the second end 32 of the rotating mechanism 3 is preferably rotatably sandwiched between the second upper shell 30 and the second lower shell 40, or the second end 32 of the rotating mechanism 3 is rotatably disposed in the first sleeve of the second upper shell 30.

[0041] Regarding the installation position of the first wheel 60, in some embodiments, the first component group includes the first wheel 60, which is disposed on the outer end of the first upper shell 10 away from the middle shell 50, and the second component group includes the second wheel 70, which is disposed on the outer end of the middle shell 50 away from the first upper shell 10. More specifically, the first wheel 60 includes a first axle 601. The first upper shell 10 is provided with a first axle mounting seat 103. The first axle mounting seat 103 includes a first axle pressure plate fixing hole 104 and a first axle mounting groove 105. The first axle mounting groove 105 is adapted to fit the first axle 601, and the first axle 601 is mounted in the first axle mounting groove. The first axle pressure plate fixing holes 104 include two groups, and the two groups of first axle pressure plate fixing holes 104 are symmetrically arranged on both sides of the first axle mounting groove 105. The first axle mounting seat 103 is also provided with a first axle pressing plate 602, and the first axle is fixed in the first axle mounting groove through the first axle pressing plate 602; the first axle pressing plate 602 is fixedly connected to the first axle mounting seat 103 by screws to ensure that the first axle will not separate from the first axle mounting groove.

[0042] Regarding the installation position of the first wheel 60, in other embodiments, the first component group includes a first wheel 60, which is disposed on the outer end of the first lower shell 20 away from the middle shell 50. More specifically, the first wheel 60 includes a first axle 601. The first lower shell 20 is provided with a first axle mounting seat 103. The first axle mounting seat 103 includes a first axle pressure plate fixing hole 104 and a first axle mounting groove 105. The first axle mounting groove 105 is adapted to fit the first axle, and the first axle is mounted in the first axle mounting groove. The first axle pressure plate fixing holes 104 include two groups, and the two groups of first axle pressure plate fixing holes 104 are symmetrically arranged on both sides of the first axle mounting groove 105. The first axle mounting seat 103 is also provided with a first axle pressure plate 602, and the first axle is fixed to the first axle mounting groove via the first axle pressure plate 602. The first axle pressure plate 602 is fixedly connected to the first axle mounting seat 103 by screws to ensure that the first axle does not fall out of the first axle mounting groove.

[0043] Based on the above embodiments, preferably, the first component group includes a first control board 4. To protect the first control board 4, the first control board 4 is located between the first upper shell 10 and the first lower shell 20. A first control board connection post 106 is provided on the first upper shell 10 or the first lower shell 20, and the first control board 4 is fixedly connected to the first upper shell 10 or the first lower shell 20 through the first control board connection post 106. To make the installation of the first control board 4 more firm, the first control board connection post 106 includes two groups, and the two groups of first control board connection posts 106 are respectively arranged on both sides of the first axle mounting seat 103, so that the first control board 4 does not interfere with the first axle mounting seat 103.

[0044] The above embodiments are only the preferred embodiments of the present invention and cannot be used to limit the scope of protection of the present invention. Any non-substantial changes and substitutions made by those skilled in the art on the basis of the present invention fall within the scope of protection required by the present invention.

Claims

1. A self-balancing scooter, comprising a first vehicle body and a second vehicle body, characterized in that: The first vehicle body includes a first upper shell and a first lower shell. The second vehicle body includes a second upper shell, a middle shell, and a second lower shell. The middle shell is disposed between the second upper shell and the second lower shell, and the lower surface of the second upper shell abuts against the upper surface of the middle shell. A second axle mounting seat is provided on the second upper shell. A second wheel is connected to the second vehicle body. The second wheel includes a second axle, and the second axle is connected to the second upper shell. The second axle is located below the middle shell. A through groove is provided on the middle shell. The second axle mounting seat passes through the through groove and is connected to the second axle. The through groove on the middle shell has an opening facing the second wheel, and the opening is for the second axle to pass through. The first vehicle body and the second vehicle body are connected by a rotating mechanism. The rotating mechanism includes a rotating shaft. The rotating mechanism further includes a bearing or a second sleeve. One end of the rotating shaft is fixed to the first vehicle body, and the other end is located inside the second vehicle body and is rotatably connected to the bearing or the second sleeve. The bearing or the second sleeve is fixed to the second vehicle body. The rotating shaft is provided with a limiting boss with a notch. A limiting mechanism is further included. The limiting mechanism includes a limiting block and a limiting block mounting groove. The limiting block mounting groove is provided on the second upper shell and / or the second lower shell. The limiting block is a limiting piece corresponding to the limiting boss. The top surface of the limiting piece can respectively abut against both ends of the limiting boss when the rotating shaft rotates, so as to limit the rotation angle of the rotating shaft.

2. The self-balancing scooter according to claim 1, wherein: The second axle mounting seat includes a second axle pressing plate fixing hole and a second axle mounting groove. There are two groups of the second axle pressing plate fixing holes, and the two groups of the second axle pressing plate fixing holes are symmetrically arranged on both sides of the second axle mounting groove.

3. The self-balancing scooter according to claim 1 or 2, characterized in that: Second control board connecting columns are provided on the lower side of the middle shell, and the second control board connecting columns are correspondingly arranged outside the second axle mounting seat.

4. The self-balancing scooter according to claim 3, wherein: There are two groups of the second control board connecting columns, and the two groups of the second control board connecting columns are respectively correspondingly arranged on both sides of the second axle mounting seat, on both sides of the through groove of the middle shell.

5. The scooter as claimed in claim 1, wherein: A rotating upper connecting groove is provided on the second upper shell, and a rotating lower connecting groove is provided on the second lower shell. The bearing or the second sleeve of the rotating mechanism is clamped in the rotating upper connecting groove and the rotating lower connecting groove.

6. The self-balancing scooter according to claim 5, wherein: A rotating mechanism fixing groove is provided on one side of the first upper shell and / or the first lower shell close to the middle shell. The rotating shaft of the rotating mechanism is fixedly arranged between the first upper shell and the first lower shell through the rotating mechanism fixing groove; or A rotating mechanism fixing column is provided on one side of the first upper shell and / or the first lower shell close to the middle shell. The rotating shaft of the rotating mechanism is fixedly arranged between the first upper shell and the first lower shell through the rotating mechanism fixing column.

7. The self-balancing scooter according to claim 1, characterized in that: The first upper shell or the first lower shell is provided with a first axle mounting seat, and the first axle mounting seat includes a first axle pressing plate fixing hole and a first axle mounting groove; the first axle pressing plate fixing hole includes two groups, and the two groups of the first axle pressing plate fixing holes are symmetrically arranged on both sides of the first axle mounting groove; the first upper shell or the first lower shell is provided with a first control board connecting column; the first control board connecting column includes two groups, and the two groups of the first control board connecting columns are respectively arranged on both sides of the first axle mounting seat.

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