An automatic tracking energy-integrated smart windbreak for bridges

Abstract

This invention relates to the field of windbreak technology and discloses an automatic tracking type energy-integrated intelligent windbreak for bridges. The device includes a windbreak body, inside which, from top to bottom, are arranged a wind power generation component, a solar power generation component, an inverter, a combiner box, and a battery. In this invention, the photovoltaic panel can automatically track sunlight by adjusting the motor speed, maintaining the optimal incident angle and improving solar energy utilization efficiency. Simultaneously, the photovoltaic panel is housed within strong, protective fasteners, effectively enhancing its wind resistance and structural stability during automatic opening and closing. This windbreak is suitable for bridge and road environments, enabling efficient synergistic generation of wind and solar energy even in strong winds, and storing and utilizing the electrical energy.

Description

Technical Field

[0001] This invention relates to the field of windbreaks, specifically an automatic tracking type energy-integrated intelligent windbreak for bridges. Background Technology

[0002] Existing bridge windbreaks are mostly passive structures, primarily serving to block strong winds and reduce lateral wind speeds on the bridge deck, lacking autonomous adjustment capabilities. Some windbreaks with electrically adjustable functions (such as structures with variable permeability and height) typically rely on external power to drive the adjustment mechanism. This type of design not only increases the cost of infrastructure construction such as cable laying and power supply systems, but also requires a continuous and stable power supply, thus increasing overall operation and maintenance costs. Especially in remote areas or bridge areas with unstable power supply, the difficulty in accessing external energy sources and the inability to guarantee power supply stability prevent intelligent adjustable windbreaks from functioning properly, limiting their widespread application in complex environments. Furthermore, existing systems generally do not consider utilizing the abundant wind and solar energy resources in the bridge area to achieve self-sufficiency and energy storage, thus failing to meet the engineering requirements of green, low-consumption, and highly autonomous projects. In addition, windbreaks applied to bridge and road environments face the problem of lightweight floating debris such as plastic bags and paper pieces adhering to the wind. When such objects cover the surface of photovoltaic modules or the air inlet / outlet of the duct, they will directly affect the efficiency of wind and solar energy collection, reduce the overall energy conversion performance, and affect the stability and reliability of system operation.

[0003] In summary, existing technologies still have significant shortcomings in terms of energy self-sufficiency and anti-interference operation. There is an urgent need for an intelligent windbreak structure for bridges that can integrate wind and solar energy collection functions, has automatic tracking and adjustment capabilities, and can adapt to complex operating environments. Summary of the Invention

[0004] This invention provides an automatic tracking energy-integrated intelligent windbreak for bridges, which overcomes the shortcomings described in the background art.

[0005] The technical solution adopted by this invention to solve its technical problem is:

[0006] An automatic tracking type energy-integrated intelligent windbreak for bridges includes a windbreak body, and from top to bottom, a wind power generation component, a solar power generation component, an inverter, a combiner box, and a battery are arranged in sequence. The battery is electrically connected to the inverter and the combiner box respectively.

[0007] The wind power generation component includes a generator and an impeller installed on the drive end of the generator. The windbreak body has an airflow channel for airflow. The surface of the airflow channel near the impeller has an outwardly raised mounting cavity. The two ends of the airflow channel extend to the upper end and the side of the windbreak body, respectively. The upper end of the windbreak body is also provided with a guide plate. The side of the guide plate near the airflow channel has an arc-shaped surface so as to guide the airflow into the airflow channel to drive the impeller to rotate.

[0008] The photovoltaic power generation component includes a photovoltaic panel, a connecting rod, a motor, and a lead screw mounted on the output shaft of the motor. A lead screw slider is sleeved on the lead screw. The two ends of the connecting rod are respectively rotatably connected to the lead screw slider and the second connecting shaft set at the lower end of the photovoltaic panel. The photovoltaic panel is rotatably mounted in the windbreak body through the first connecting shaft set at its end, so that the motor drives the lead screw to lift the lead screw slider upward and unfold the photovoltaic panel outward.

[0009] The generator is electrically connected to the inverter, and the photovoltaic panel is electrically connected to the inverter and the combiner box, respectively.

[0010] In a preferred embodiment, the photovoltaic panel includes a protective cover, a fastener, and a photovoltaic panel body. The protective cover and the photovoltaic panel body are respectively disposed at the upper and lower ends of the fastener, and the protective cover is sway-connected to the photovoltaic panel body via a hinge.

[0011] The protective cover includes an outer frame, elastic support strips, a light-transmitting membrane, and anti-collision blocks. The outer frame surface has multiple openings, and the elastic support strips and light-transmitting membranes are respectively spaced within each opening. The elastic support strips protrude from the outer frame surface. The surface of the reinforcing fasteners has multiple solar cells. Anti-collision blocks are arrayed on the outer frame, and multiple rectangular openings are formed between all anti-collision blocks and the outer frame. The light-transmitting membrane is disposed within each rectangular opening. When the outer frame covers the photovoltaic panel body, the anti-collision blocks abut against the edges of adjacent solar cells.

[0012] In a preferred embodiment, the photovoltaic panel is provided with a driving mechanism at one end near the hinge. The driving mechanism includes an arc-shaped inner rod, an arc-shaped outer tube, and a sealed housing. The arc-shaped inner rod is fixed to the surface of the outer frame, and the arc-shaped outer tube is sleeved on the outside of the arc-shaped inner rod. The arc-shaped outer tube controls the positive and negative pressure of the air at its inner end through an external air pump. The arc-shaped inner rod and the arc-shaped outer tube form a piston connection, so that the negative pressure generated by the air pump controls the extension and retraction of the arc-shaped inner rod, thereby driving the protective cover to swing around the hinge as a fulcrum.

[0013] The adjacent ends of the arc-shaped inner rod and the arc-shaped outer tube are both arc-shaped.

[0014] A preferred technical solution is that the photovoltaic panel body includes a support frame and anti-collision blocks 2. The end of the photovoltaic panel away from the driving mechanism is provided with a fixing member. The support frame is connected to the fixing member and the limiting fixing block 4 set on the upper end of the driving mechanism. The middle part of the support frame has a grid-shaped structure. The anti-collision blocks 2 are respectively set at each bend of the middle surface of the support frame. The anti-collision blocks 2 are offset from the anti-collision blocks 1.

[0015] The sealed housing is abutted against the strong fastener by the limiting fixing block four.

[0016] In a preferred embodiment, the fixing component includes a first limiting fixing block and a second limiting fixing block. Both the first limiting fixing block and the second limiting fixing block are provided with magnetic blocks. The two magnetic blocks are magnetically attracted to each other and are arranged close to each other.

[0017] The protective cover is provided with three limiting blocks near the limiting fixing blocks. When the protective cover is closed on the surface of the fastener, the three limiting blocks abut against the four limiting blocks, and the one limiting block abuts against the two limiting blocks.

[0018] Compared with existing technologies, this technical solution has the following advantages:

[0019] In this invention, wind power generation components and solar power generation components can work together to convert wind energy and solar energy into electrical energy and store it in a battery. No external power source is required, saving wiring costs and reducing operating costs. It is especially suitable for remote or unstable power supply areas, ensuring stable operation of the regulation function. Secondly, the elastic support strips and light-transmitting membrane of the protective cover can block obstructions, and its dynamic swing can shake off attached debris, reducing the impact on photovoltaic panels and airflow channels and improving energy utilization efficiency. Attached Figure Description

[0020] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0021] Figure 1 This is an overall diagram of the present invention.

[0022] Figure 2 This is a schematic diagram of a wind power generation component.

[0023] Figure 3 This is a schematic diagram of a solar power generation module.

[0024] Figure 4 This is a schematic diagram of a photovoltaic panel.

[0025] Figure 5 for Figure 4 Plan view.

[0026] Figure 6 This is a schematic diagram of the protective shield unfolding.

[0027] Figure 7 for Figure 6 Frontal view of the diagram.

[0028] Figure 8 A schematic diagram showing the connection between the protective cover, the photovoltaic panel body, and the drive mechanism.

[0029] Figure 9 This is a diagram showing the disassembled protective shield.

[0030] Figure 10 This is a schematic diagram of the fastener.

[0031] In the diagram: 1. Wind power generation component; 2. Solar power generation component; 3. Inverter; 4. Combiner box; 5. Battery; 6. Windbreak body.

[0032] Impeller 11, Generator 12;

[0033] Photovoltaic panel 21, connecting rod 22, motor 23, lead screw 24, lead screw slider 241;

[0034] Protective cover 211, outer frame 2111, elastic support strip 2112, light-transmitting diaphragm 2113, anti-collision block 2114;

[0035] Fastener 212, Connecting Shaft 1 2121, Connecting Shaft 2 2122;

[0036] Photovoltaic panel body 213, supporting frame 2131, anti-collision block 2132;

[0037] Drive mechanism 214, arc-shaped inner rod 2141, arc-shaped outer tube 2142, sealing housing 2143;

[0038] Fixing component 215, limiting fixing block one 2151, limiting fixing block two 2152, magnetic block 2153;

[0039] Limiting and fixing block three 101, limiting and fixing block four 102;

[0040] Airflow channel 61, mounting cavity 62, guide plate 63. Detailed Implementation

[0041] like Figures 1 to 10 As shown, the present invention proposes an automatic tracking type energy-integrated intelligent windbreak for bridges, including a windbreak body 6. The windbreak body 6 is provided with a wind power generation component 1, a solar power generation component 2, an inverter 3, a combiner box 4 and a battery 5 from top to bottom. The battery 5 is electrically connected to the inverter 3 and the combiner box 4 respectively.

[0042] The wind power generation component 1 is equipped with a generator 12 and an impeller 11 installed on the drive end of the generator 12. The windbreak body 6 is equipped with an airflow channel 61 for airflow. The surface of the airflow channel 61 near the impeller 11 has an outwardly raised mounting cavity 62. The two ends of the airflow channel 61 extend to the upper end and the side of the windbreak body 6, respectively. The upper end of the windbreak body 6 is also equipped with a guide plate 63. The side of the guide plate 63 near the airflow channel 61 has an arc-shaped surface so as to guide the airflow into the airflow channel 61 through the arc-shaped surface to drive the impeller 11 to rotate.

[0043] The photovoltaic power generation component 2 includes a photovoltaic panel 21, a connecting rod 22, a motor 23, and a lead screw 24 mounted on the output shaft of the motor 23. A lead screw slider 241 is sleeved on the lead screw 24. The two ends of the connecting rod 22 are rotatably connected to the lead screw slider 241 and the connecting shaft 2122 set at the lower end of the photovoltaic panel 21, respectively. The photovoltaic panel 21 is rotatably mounted in the windbreak body 6 through the connecting shaft 2121 set at its end, so that the motor 23 drives the lead screw 24 to lift the lead screw slider 241 upward and unfold the photovoltaic panel 21 outward.

[0044] The generator 12 is electrically connected to the inverter 3, and the photovoltaic panel 21 is electrically connected to the inverter 3 and the combiner box 4 respectively.

[0045] This invention generates electricity through the synergistic effect of wind power generation component 1 and solar power generation component 2. At the same time, by precisely controlling the rotation speed of motor 23, the unfolding angle of photovoltaic panel 21 is dynamically adjusted according to the change of solar angle, maximizing the utilization of clean energy.

[0046] In terms of wind power generation, the wind power generation component 1 efficiently captures wind energy by relying on a unique airflow guiding structure. The airflow channel 61 inside the windbreak body 6 extends to the upper end and the side of the body, forming a multi-directional airflow inlet. When the wind blows, the guide plate 63 at the upper end plays a key role. Its arc-shaped surface near the airflow channel 61 can smoothly guide the oncoming airflow into the airflow channel 61. During the flow of the airflow entering the channel, it will be guided to the outwardly raised mounting cavity 62, where the impeller 11 of the generator 12 drive end is installed. The high-speed airflow impacts the impeller 11, causing it to rotate rapidly. The rotation of the impeller 11 directly drives the generator 12 to operate, converting wind energy into electrical energy. The generated electrical energy is rectified and inverted by the inverter 3, which is electrically connected to the generator 12, and converted into stable electrical energy. Part of it is used for the various functions of the windbreak, and the other part is sent to the battery 5 for storage for later use.

[0047] The solar power generation module 2 achieves efficient utilization of solar energy through adjustable photovoltaic panels 21. When the motor 23 starts, its output shaft drives the lead screw 24 to rotate, and the lead screw slider 241 moves linearly on the lead screw 24. When the lead screw slider 241 is lifted upward, the photovoltaic panel 21 will expand outward with the connecting shaft 2121 as the fulcrum through the transmission action of the connecting rod 22, increasing the contact area with sunlight.

[0048] To ensure that the photovoltaic panel 21 unfolds in accordance with the changing angle of the sun, the rotation speed of the motor 23 needs to be precisely adjusted. The angle of the sun changes continuously throughout the day, gradually increasing from a low angle in the morning, reaching its peak at noon, and then gradually decreasing in the afternoon. (See attached image) Figure 1 As shown, the solar energy emitting components 2 are arranged on the left and right sides of the windbreak body 6. Since the motor 23 can drive the lead screw 24 on its output shaft to rotate, the lead screw slider 241 moves upward along the lead screw 24, which allows the photovoltaic panel 21 to swing and unfold with the connecting shaft 2121 as the fulcrum. Therefore, by pre-setting the rotation speed of the output shaft of the motor 23, the swing speed of the photovoltaic panel 21 can be changed with the movement of the sun to change the swing angle of the photovoltaic panel 21. That is, the swing angle of the photovoltaic panel 21 is smaller in the early morning and evening, and the swing angle of the photovoltaic panel is the largest at noon, always maintaining the best angle of receiving sunlight. Furthermore, the start, stop and speed of the motor 23 can be controlled to achieve precise adjustment of the unfolding angle of the photovoltaic panel 21, thereby improving the light energy conversion efficiency.

[0049] Furthermore, the photovoltaic panel 21 includes a protective cover 211, a fastener 212, and a photovoltaic panel body 213. The protective cover 211 and the photovoltaic panel body 213 are respectively disposed at the upper and lower ends of the fastener 212, and the protective cover 211 is sway-connected to the photovoltaic panel body 213 via a hinge.

[0050] The protective cover 211 includes an outer frame 2111, elastic support bars 2112, a light-transmitting membrane 2113, and anti-collision blocks 2114. The outer frame 2111 has multiple openings on its surface. The elastic support bars 2112 and the light-transmitting membrane 2113 are respectively spaced within each opening. The elastic support bars 2112 protrude from the surface of the outer frame 2111. The surface of the fasteners 212 has multiple solar cells on its surface. The anti-collision blocks 2114 are arrayed on the outer frame 2111. Multiple rectangular openings are formed between all the anti-collision blocks 2114 and the outer frame 2111. The light-transmitting membrane 2113 is disposed within each rectangular opening. When the outer frame 2111 covers the photovoltaic panel body 213, the anti-collision blocks 2114 abut against the edges of the adjacent solar cells.

[0051] Furthermore, the photovoltaic panel 21 is provided with a drive mechanism 214 at one end near the hinge. The drive mechanism 214 includes an arc-shaped inner rod 2141, an arc-shaped outer tube 2142, and a sealed housing 2143. The arc-shaped inner rod 2141 is fixed to the surface of the outer frame 2111, and the arc-shaped outer tube 2142 is sleeved on the outside of the arc-shaped inner rod 2141. The arc-shaped outer tube 2142 controls the positive and negative pressure of the air at its inner end through an external air pump. The arc-shaped inner rod 2141 and the arc-shaped outer tube 2142 form a piston connection so that the negative pressure is generated by the air pump to control the extension and retraction of the arc-shaped inner rod 2141, thereby driving the protective cover 211 to swing with the hinge as the fulcrum.

[0052] The adjacent ends of the arc-shaped inner rod 2141 and the arc-shaped outer tube 2142 are both arc-shaped.

[0053] In the structure of the photovoltaic panel 21, the protective cover 211 is connected to the photovoltaic panel body 213 by a hinge, which provides the basis for the dynamic unfolding of the protective cover. When the photovoltaic panel 21 unfolds outward under the drive of the motor 23, the protective cover 211 unfolds synchronously with the movement of the photovoltaic panel body 213. At this time, the elastic support strip 2112 and the light-transmitting membrane 2113 work together through a unique structural design to separate the obstruction.

[0054] Structurally, the elastic support strip 2112 protrudes from the surface of the outer frame 2111 and possesses a certain degree of elastic deformation capability. When the protective cover 211 is unfolded, its outer frame 2111 changes position and angle with the movement of the photovoltaic panel. The protruding elastic support strip 2112 will first come into contact with any potential obstructions (such as plastic bags, pieces of paper, etc.). Since obstructions are usually lightweight and have a certain degree of flexibility, the elastic support strip 2112 will push the obstruction upward or to the side upon contact, utilizing its protruding height to form a physical barrier, preventing the obstruction from directly adhering to the surface of the photovoltaic panel body 213 or the light-transmitting membrane 2113. At the same time, the elastic properties of the elastic support strip 2112 can also produce slight deformation upon contact with obstructions, reducing the adhesion force on the obstructions and further reducing the possibility of obstruction adhesion.

[0055] The light-transmitting membrane 2113 is spaced within the openings of the outer frame 2111 and connected to the anti-collision block 2114, possessing a certain degree of tension and flexibility. During the unfolding of the protective cover 211, the light-transmitting membrane 2113 maintains a flat state due to its own tension as the angle of the outer frame 2111 changes. When the elastic support bar 2112 pushes away the obstruction, the light-transmitting membrane 2113 forms a continuous barrier surface. Its smooth surface is translucent, ensuring that sunlight can penetrate normally to the solar cells of the photovoltaic panel body 213, while also using its own tension and surface properties to prevent the pushed-away obstruction from approaching again. Furthermore, the connection between the light-transmitting membrane 2113 and the anti-collision block 2114 enhances its structural stability, making it less prone to wrinkling under airflow or slight external force, ensuring the integrity of the barrier surface and continuously fulfilling its function of separating obstructions.

[0056] Secondly, since the photovoltaic panel 21 in this invention is fixed by the fastener 212, while the opening and closing process of the photovoltaic panel 21 is protected by the structural settings inside the fastener 212, the wind resistance of the photovoltaic panel 21 can also be enhanced by the fastener 212. Furthermore, the fastener 212 can effectively improve the fixation of the photovoltaic panel body 213, so that it can still form a good cooperation with the wind power generation component 1 in windy weather, and fully convert light energy and wind energy into electrical energy for storage.

[0057] The synergistic working principle of the two is as follows: the elastic support strip 2112, utilizing its prominent physical structure and elastic deformation, actively pushes away obstructions the moment the protective cover unfolds, acting as the "first line of defense"; the light-transmitting membrane 2113, relying on its own tension and continuity, forms the "second line of defense," blocking the pushed-away obstructions to the outside while ensuring that the light transmission function is not affected. This combination of "actively pushing away + continuously blocking" effectively prevents obstructions from adhering to the surface of the photovoltaic panel or affecting key areas of light energy absorption, ensuring the efficient utilization of light energy by the photovoltaic panel 21. At the same time, the connection between the elastic support strip 2112 and the light-transmitting membrane 2113 and the anti-collision block 2114 further enhances the structural stability of the entire protective cover 211, ensuring that the function of blocking obstructions can be stably performed under long-term use and various environmental conditions.

[0058] The photovoltaic panel body 213 includes a support frame 2131 and anti-collision blocks 2132. A fixing member 215 is provided at the end of the photovoltaic panel 21 furthest from the drive mechanism 214. The support frame 2131 is connected to the fixing member 215 and a limiting fixing block 102 located on the upper end of the drive mechanism 214. The support frame 2131 has a grid-like structure in the middle. The anti-collision blocks 2132 are respectively located at various bends on the middle surface of the support frame 2131. The anti-collision blocks 2132 are staggered from the anti-collision blocks 2114. These bends are force transmission nodes of the support frame 2131. The anti-collision blocks 2132 are positioned closer to the middle of the fasteners 212, mainly to cope with the longitudinal pressure from the photovoltaic panel body 213. The staggered distribution of the two ensures that both the upper and lower sides of the photovoltaic panel body 213 are adequately protected.

[0059] The sealed housing 2143 is abutted against the fastener 212 by the limiting fixing block 4 102.

[0060] Furthermore, the fixing member 215 includes a first limiting fixing block 2151 and a second limiting fixing block 2152. Both the first limiting fixing block 2151 and the second limiting fixing block 2152 are provided with magnetic blocks 2153. The two magnetic blocks 2153 are magnetically attracted to each other and are arranged close to each other.

[0061] The protective cover 211 is provided with a limiting fixing block 3 101 near the limiting fixing block 4 102. When the protective cover 211 covers the surface of the fastener 212, the limiting fixing block 3 101 abuts against the limiting fixing block 4 102, and the limiting fixing block 1 2151 abuts against the limiting fixing block 2152.

[0062] The above description is merely a preferred embodiment of the present invention, and therefore should not be construed as limiting the scope of the present invention. All equivalent changes and modifications made in accordance with the scope of the patent and the contents of the specification should still fall within the scope of the present invention.

Claims

1. A bridge-mounted, automatically tracking, energy-integrated intelligent windbreak, comprising a windbreak body, characterized in that, The windbreak body contains, from top to bottom, wind power generation components, solar power generation components, inverters, combiner boxes, and batteries. The batteries are electrically connected to the inverters and combiner boxes, respectively. The wind power generation component includes a generator and an impeller installed on the drive end of the generator. The windbreak body has an airflow channel for airflow. The surface of the airflow channel near the impeller has an outwardly raised mounting cavity. The two ends of the airflow channel extend to the upper end and the side of the windbreak body, respectively. The upper end of the windbreak body is also provided with a guide plate. The side of the guide plate near the airflow channel has an arc-shaped surface so as to guide the airflow into the airflow channel to drive the impeller to rotate. The photovoltaic power generation component includes a photovoltaic panel, a connecting rod, a motor, and a lead screw mounted on the output shaft of the motor. A lead screw slider is sleeved on the lead screw. The two ends of the connecting rod are respectively rotatably connected to the lead screw slider and the second connecting shaft set at the lower end of the photovoltaic panel. The photovoltaic panel is rotatably mounted in the windbreak body through the first connecting shaft set at its end, so that the motor drives the lead screw to lift the lead screw slider upward and unfold the photovoltaic panel outward. The generator is electrically connected to the inverter, and the photovoltaic panel is electrically connected to the inverter and the combiner box respectively. The photovoltaic panel includes a protective cover, a fastener, and a photovoltaic panel body. The protective cover and the photovoltaic panel body are respectively disposed at the upper and lower ends of the fastener, and the protective cover is sway-connected to the photovoltaic panel body via a hinge. The protective cover includes an outer frame, elastic support strips, a light-transmitting membrane, and anti-collision blocks. The outer frame surface has multiple openings, and the elastic support strips and light-transmitting membranes are respectively spaced within each opening. The elastic support strips protrude from the outer frame surface. The surface of the reinforcing fasteners has multiple solar cells. Anti-collision blocks are arrayed on the outer frame, and multiple rectangular openings are formed between all anti-collision blocks and the outer frame. The light-transmitting membrane is disposed within each rectangular opening. When the outer frame covers the photovoltaic panel body, the anti-collision blocks abut against the edges of adjacent solar cells.

2. The bridge-mounted automatic tracking energy-integrated intelligent windbreak according to claim 1, characterized in that, The photovoltaic panel is equipped with a driving mechanism at one end near the hinge. The driving mechanism includes an arc-shaped inner rod, an arc-shaped outer tube, and a sealed shell. The arc-shaped inner rod is fixed to the surface of the outer frame, and the arc-shaped outer tube is sleeved on the outside of the arc-shaped inner rod. The arc-shaped outer tube controls the positive and negative pressure of the air at its inner end through an external air pump. The arc-shaped inner rod and the arc-shaped outer tube form a piston connection so that the negative pressure generated by the air pump controls the extension and retraction of the arc-shaped inner rod, thereby driving the protective cover to swing around the hinge as a fulcrum. The adjacent ends of the arc-shaped inner rod and the arc-shaped outer tube are both arc-shaped.

3. The bridge-mounted automatic tracking energy-integrated intelligent windbreak according to claim 2, characterized in that, The photovoltaic panel body includes a support frame and anti-collision block 2. The photovoltaic panel is provided with a fixing member at the end away from the driving mechanism. The support frame is connected to the fixing member and the limiting fixing block 4 set at the upper end of the driving mechanism. The middle part of the support frame has a grid-shaped structure. Anti-collision block 2 is respectively set at each bend of the middle surface of the support frame. Anti-collision block 2 is offset from anti-collision block 1. The sealed housing is abutted against the strong fastener by the limiting fixing block four.

4. The bridge automatic tracking type energy-integrated intelligent windbreak according to claim 3, characterized in that, The fastener includes a first limiting fastener and a second limiting fastener. Both the first limiting fastener and the second limiting fastener are provided with magnetic blocks. The two magnetic blocks are magnetically attracted to each other and are arranged close to each other. The protective cover is provided with three limiting blocks near the limiting fixing blocks. When the protective cover is closed on the surface of the fastener, the three limiting blocks abut against the four limiting blocks, and the one limiting block abuts against the two limiting blocks.

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