Energy self-supply type photovoltaic bench

Abstract

The invention relates to the technical field of photovoltaic benches, and discloses an energy self-supply type photovoltaic bench which comprises a bench body, a plurality of placement cavities are formed in the bench body, heaters are installed in the placement cavities, first connecting ends are symmetrically installed on the two sides of the inner walls of the placement cavities, and the first connecting ends are connected with an internal circuit of the bench body. A connecting piece is arranged between each first connecting end and the heater, the phase-change material in the flexible frame can absorb heat generated by the photovoltaic panel in the daytime and store the heat through phase change of the phase-change material, meanwhile, the other part of the heat is dissipated to the outside through the heat conduction plate and the convex part, the temperature of the photovoltaic panel is effectively reduced, the power generation efficiency is improved, and at night, the power generation efficiency is improved. When the temperature is reduced, the phase-change material can release stored heat and inhibit the dew formation of the photovoltaic plate, and in addition, the flexible frame not only has good heat-conducting property, but also can elastically deform, so that the thermal stress generated by the temperature change of the photovoltaic plate is effectively offset, the photovoltaic plate is protected, and the service life of the photovoltaic plate is prolonged.

Description

Technical Field

[0001] The invention relates to the technical field of photovoltaic benches, in particular to an energy self-supply type photovoltaic bench. Background Art

[0002] As a public facility that combines rest and green energy collection, photovoltaic benches have attracted widespread attention due to their environmental protection and energy-saving features.

[0003] However, photovoltaic benches also have some inconveniences in use, especially at night or early in the morning. Since photovoltaic panels are mostly made of metal or glass, which have strong thermal conductivity, the surface temperature of the bench is low, and users will feel cold and uncomfortable when sitting down. This experience is more obvious in cold seasons or humid environments, reducing the user's comfort.

[0004] In addition, the significant decrease in the power generation efficiency of photovoltaic panels in high temperature environments is a common technical problem that needs to be overcome urgently. For photovoltaic benches, this problem is particularly prominent. High temperature causes the carrier recombination inside the photovoltaic panels to intensify and the resistance to increase, which in turn seriously weakens its photoelectric conversion ability, greatly limiting the overall performance of the photovoltaic bench.

[0005] This not only results in the bench being unable to generate electricity efficiently during high temperature periods to meet users' electricity needs, but also the unstable power generation greatly reduces its practicality, and it encounters many obstacles during market promotion.

[0006] Although the existing technology attempts to alleviate the adverse effects of high temperature on photovoltaic panels by adding a cooling structure in order to maintain their power generation efficiency, this solution has obvious disadvantages.

[0007] Essentially, the core function of a photovoltaic bench is to generate electricity using solar energy, and adding cooling structures, such as fans and electrical appliances, is undoubtedly putting the cart before the horse. These cooling devices consume a lot of electricity during operation, which not only offsets the electricity generated by the photovoltaic panels, but may even lead to net electricity consumption, which runs counter to the original intention of the photovoltaic bench to provide self-sustaining energy.

[0008] In addition, the additional refrigeration equipment increases the complexity, cost and maintenance difficulty of the system, further reducing the feasibility and economy of photovoltaic benches in practical applications.

[0009] To this end, the present invention proposes an energy self-supply photovoltaic bench. Summary of the invention

[0010] The purpose of the present invention is to provide an energy self-supply photovoltaic bench to solve the problems raised in the above background technology.

[0011] To achieve the above object, the present invention provides the following technical solution: An energy self-supplying photovoltaic bench, including a bench body, wherein a plurality of placement cavities are opened inside the bench body, heaters are installed inside each placement cavity, two sides of the inner wall of each placement cavity are symmetrically provided with connection ends I, the connection ends I are all connected to the internal circuit of the bench body, a connecting piece is arranged between each connection end I and the heater, a reset piece is installed inside both the connecting piece and the placement cavity, and connection ends II are installed at both ends of the heater; When a user sits down, the gravity of the human body acts on the connecting piece, forcing it to form electrical contact with the connection end I and the connection end II. At this time, the circuit is turned on, and the heater starts the heating function to provide a heating function for the user; After the user leaves the seat, the reset piece drives the connecting piece to disengage from the contact point, the circuit is automatically cut off, and the heater stops working.

[0012] Preferably, the reset piece includes: A reset spring, fixedly connected to the bottom of the placement cavity; An insulating plate, fixedly connected to the top of the reset spring and slidably connected inside the placement cavity; The connecting piece includes: A conductive plate, fixedly connected between two insulating plates; An insulating column, fixedly connected to the top of the conductive plate.

[0013] Preferably, holes for the insulating column to slide are opened on the surface of the bench body.

[0014] Preferably, a photovoltaic panel is installed inside the bench body, a flexible frame is installed on the outer edge of the photovoltaic panel, a phase change material is filled inside the flexible frame, a heat conduction plate is installed on the outer surface of the flexible frame, convex parts are fixedly connected to both sides of the heat conduction plate, and the convex parts extend downward and obliquely to the inner surface of the bench body.

[0015] Preferably, a plurality of fins are symmetrically installed inside the bench body, both sides of the fins are located outside the bench body, and the convex parts are in contact with the fins. The flexible frame is adhered to the outer surface of the photovoltaic panel, and the heat conduction plate is fixedly connected to the top of the inner cavity of the bench body.

[0016] Preferably, a thermoelectric device is installed inside the bench body, the thermoelectric device is connected to a load circuit, and the load circuit can be connected to a variety of electrical devices, such as a heater or a wireless charging module.

[0017] Preferably, the thermoelectric device includes: A hot end, fixedly connected to the top of the heat conduction plate; A cold end, fixedly connected to the bottom of the inner cavity of the bench body; The thermoelectric device is a bismuth telluride-based material, specifically a Bi2Te-Sb2Te3 solid solution.

[0018] Preferably, a sunshade column is installed on the outer surface of the bench body, and a sunshade board is installed on the top of the sunshade column. The surfaces of the sunshade board and the sunshade column are provided with photovoltaic materials for increasing power generation.

[0019] Preferably, the sunshade board is rotatably connected to the top of the sunshade column, and electric push rods are symmetrically installed between the sunshade column and the sunshade board. An external sensor is arranged inside the bench body.

[0020] Preferably, the electric push rod is fixedly connected to the top of the sunshade column. Sliding grooves are symmetrically formed on the surface of the sunshade board, and the telescopic end of the electric push rod is slidably connected inside the sliding grooves. The electric push rod is electrically connected to the external sensor.

[0021] Preferably, the phase change material is a composite material of erythritol and paraffin.

[0022] Preferably, the flexible frame is made of heat-conducting silica gel.

[0023] Preferably, the external sensor is specifically a gravity sensor.

[0024] Compared with the prior art, the beneficial effects of the present invention are as follows: 1. The phase change material in the flexible frame absorbs the heat generated by the photovoltaic panel during the day, stores the heat through its own phase change, and at the same time dissipates another part of the heat to the outside through the heat-conducting plate and the convex part, effectively reducing the temperature of the photovoltaic panel and improving the power generation efficiency. At night, as the temperature drops, the phase change material releases the stored heat to inhibit the condensation of the photovoltaic panel. In addition, the flexible frame not only has good heat conduction performance but also can elastically deform, effectively offsetting the thermal stress generated by the temperature change of the photovoltaic panel, protecting the photovoltaic panel and extending its service life.

[0025] 2. The fins not only increase the heat dissipation area, enabling the heat to be dissipated to the surrounding environment more quickly, but also enhance the structural stability of the bench body, ensuring that the photovoltaic bench can be stably placed in various environments.

[0026] 3. The thermoelectric device can utilize the temperature difference generated by the heat of the photovoltaic panel, convert part of the absorbed heat into electrical energy, and connect it to the load circuit to achieve the secondary utilization of energy and improve the comprehensive energy utilization rate.

[0027] 4. The convex part is connected to the inner bottom of the bench body. Based on the principle of natural upward movement of hot air, the temperature at the bottom of the bench body is relatively low, and the heat can be more smoothly transferred from the high-temperature heat-conducting plate through the convex part to the bottom of the bench body, further improving the heat dissipation efficiency.

[0028] 5. The additional electric energy provided by the thermoelectric device drives the electric push rod, enabling the sunshade to rotate. After the external sensor detects the light and the presence of people, it controls the action of the electric push rod to provide the sunshade function for the user, enhancing the user experience. Meanwhile, the photovoltaic materials arranged on the surfaces of the sunshade and the sunshade column can also increase the power generation.

[0029] 6. When the user sits down, the first connection end and the second connection end come into contact, forming a complete circuit path. After the circuit is turned on, the heater starts to provide a heating function for the surface of the stool body, effectively alleviating the cold feeling caused by a low-temperature or humid environment and significantly enhancing the user's comfort.

[0030] 7. The heater adopts a modular design, and multiple heaters are independently distributed in different areas of the stool body. When a single user sits down, only the heater corresponding to the area where the user sits is triggered to start, and the heaters in other areas remain off, thus effectively saving energy. When multiple users sit down simultaneously, the heaters corresponding to the areas where each user sits will be started separately to ensure that each user can enjoy the heating function. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 is a front perspective schematic diagram of the main structure of the present invention; Figure 2 is a partial cross-sectional perspective schematic diagram of the main structure of the present invention; Figure 3 For the present invention Figure 2 is a magnified perspective schematic diagram of the structure at A in Figure 4 is a partial cross-sectional perspective schematic diagram of the main structure of the present invention from another angle; Figure 5 For the present invention Figure 4 is a magnified perspective schematic diagram of the structure at B in Figure 6 For the present invention Figure 4 is a magnified perspective schematic diagram of the structure at C in; Figure 7 is a perspective schematic diagram of the thermoelectric device and the convex part of the present invention; Figure 8 is a perspective schematic diagram of the thermoelectric device of the present invention; Figure 9 is an exploded perspective schematic diagram of the photovoltaic panel, the flexible frame and the heat conducting plate of the present invention; Figure 10 is a perspective schematic diagram of the main structure of the present invention from another angle; Figure 11 For the present invention Figure 10 is a magnified perspective schematic diagram of the structure at D in

[0032] In the figure: 11. Stool body; 12. Photovoltaic panel; 13. Sunshade column; 14. Sunshade.

[0033] 21. Placement cavity; 22. Heater; 23. Connector; 231. Conductive plate; 232. Insulating column; 24. Reset member; 241. Reset spring; 242. Insulating plate; 25. First connection end.

[0034] 31. Flexible frame; 32. Heat conducting plate; 321. Convex portion; 322. Fin; 33. Thermoelectric device; 331. Hot end; 332. Cold end; 34. Electric push rod. Specific implementation manner

[0035] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0036] It should be noted that the thermoelectric device 33 only provides the function of converting waste heat into electric energy, and its working principle and specific structure are both prior arts. Therefore, due to the generality of the above structure, the specific principle will not be described in detail hereinafter.

[0037] Example 1, please refer to Figures 1 to 3 As shown in the figure, an energy self-supplying photovoltaic bench includes a bench body 11. A plurality of placement cavities 21 are opened inside the bench body 11. Heaters 22 are installed inside each placement cavity 21. First connection ends 25 are symmetrically installed on both sides of the inner wall of the placement cavity 21. The first connection ends 25 are all connected to the internal circuit of the bench body 11. A connector 23 is provided between each first connection end 25 and the heater 22. A reset member 24 is installed inside both the connector 23 and the placement cavity 21. Connection ends two are installed at both ends of the heater 22; When a user sits down, the gravity of the human body acts on the connector 23, forcing it to form an electrical contact with the first connection end 25 and the second connection end. At this time, the circuit is turned on, and the heater 22 starts the heating function to provide a heating function for the user; After the user leaves the seat, the reset member 24 drives the connector 23 to disengage from the contact point, the circuit is automatically cut off, and the heater 22 stops working.

[0038] It should be noted that the reset member 24 includes: a reset spring 241, fixedly connected to the bottom of the placement cavity 21; an insulating plate 242, fixedly connected to the top of the reset spring 241 and slidably connected inside the placement cavity 21; the connector 23 includes: a conductive plate 231, fixedly connected between two insulating plates 242; an insulating column 232, fixedly connected to the top of the conductive plate 231. A hole for the insulating column 232 to slide is opened on the surface of the bench body 11.

[0039] Specifically, when the user sits down, the human body gravity is transmitted through the surface of the stool body 11 to the insulating column 232 inside the placement cavity 21. Under the action of gravity, the insulating column 232 moves downward, driving the conductive plate 231 to press down synchronously. At this time, the return spring 241 is compressed, and the insulating plate 242 slides along the inner wall of the placement cavity 21, so that the conductive plate 231 contacts the first connection end 25 and the second connection end, forming a complete circuit path. After the circuit is turned on, the heater 22 is started to provide heating function for the surface of the stool body 11, effectively relieving the cold feeling and improving the user comfort.

[0040] When the user gets up, the human body gravity disappears. Under the action of the elastic restoring force, the return spring 241 pushes the insulating plate 242 to move upward, driving the conductive plate 231 to disengage from the first connection end 25 and the second connection end, and the circuit is automatically cut off, and the heater 22 stops working.

[0041] This process realizes the intelligent control of the heating function, avoiding energy waste and ensuring the safety of the system. In addition, the design of the reset member 24 ensures that the connecting member 23 can be quickly reset to prepare for the next use.

[0042] It should be noted that since the heater 22 adopts a modular design and multiple heaters 22 are independently distributed in different areas of the stool body 11, when a single user sits down, only the heater 22 corresponding to the sitting area will be triggered to start, and the heaters 22 in other areas will remain in the off state, thus effectively saving energy. When multiple users sit down at the same time, the heaters 22 corresponding to the sitting areas of each user will be started separately to ensure that each user can enjoy the heating function.

[0043] Embodiment 2, on the basis of Embodiment 1, please refer to as Figures 4 to 9 As shown, a photovoltaic panel 12 is installed inside the stool body 11. A flexible frame 31 is installed on the outer edge of the photovoltaic panel 12. A phase change material is filled inside the flexible frame 31. A heat conducting plate 32 is installed on the outer surface of the flexible frame 31. Convex parts 321 are fixedly connected to both sides of the heat conducting plate 32, and the convex parts 321 extend downward obliquely to the inner surface of the stool body 11.

[0044] A number of fins 322 are symmetrically installed inside the stool body 11. Both sides of the fins 322 are located outside the stool body 11, and the convex parts 321 are in contact with the fins 322. The flexible frame 31 is adhered to the outer surface of the photovoltaic panel 12. The heat conducting plate 32 is fixedly connected to the top of the inner cavity of the stool body 11. The phase change material is a composite material of erythritol and paraffin, and the flexible frame 31 is made of heat conducting silica gel.

[0045] It should be noted that a thermoelectric device 33 is installed inside the stool body 11. The thermoelectric device 33 is connected to a load circuit, and the load circuit can be connected to various electrical devices, such as a heater 22 or a wireless charging module. The thermoelectric device 33 includes: a hot end 331 fixedly connected to the top of the heat conduction plate 32; a cold end 332 fixedly connected to the bottom of the inner cavity of the stool body 11. The thermoelectric device 33 is made of bismuth telluride-based material, specifically a Bi2Te-Sb2Te3 solid solution.

[0046] Specifically, when sunlight shines on the photovoltaic panel 12, the photovoltaic panel 12 absorbs photon energy, excites electrons to form an electric current, and realizes the conversion of light energy into electric energy. However, in this process, heat is inevitably generated, causing the temperature of the photovoltaic panel 12 to rise. High temperature will exacerbate the recombination of carriers inside the photovoltaic panel 12, increase the resistance, and thus reduce its power generation efficiency.

[0047] At this time, the flexible frame 31 installed on the outer edge of the photovoltaic panel 12 plays a key role. Since the flexible frame 31 is made of thermally conductive silicone material, which has good flexibility and can closely fit the outer edge of the photovoltaic panel 12, and also has excellent thermal conductivity. Therefore, when the temperature of the photovoltaic panel 12 rises to close to or exceed the phase change temperature of the phase change material inside the flexible frame 31, the phase change material absorbs the heat generated by the photovoltaic panel 12 and undergoes a phase change from solid to liquid. In this process, the phase change material stores a large amount of latent heat, effectively reducing the temperature of the photovoltaic panel 12.

[0048] The phase change material that has absorbed heat transfers part of the heat to the heat conduction plate 32 installed on its outer surface through the flexible frame 31, and the heat conduction plate 32 continues to conduct the heat to the convex part 321.

[0049] Based on the natural upward characteristic of hot air, the temperature at the bottom of the stool body 11 is relatively low. The downward inclination design of the convex part 321 enables the heat to naturally transfer from the high-temperature heat conduction plate 32 to the relatively low-temperature bottom of the stool body 11 along the convex part 321, forming a good heat transfer channel and improving the heat dissipation efficiency.

[0050] At the same time, the convex part 321 is in contact with the fin 322. The fin 322 greatly increases the heat dissipation area and can more quickly dissipate the heat transferred by the convex part 321 to the external environment, thereby reducing the temperature of the photovoltaic panel 12 and improving its power generation efficiency.

[0051] At night, the environmental temperature drops, and the phase change material undergoes a phase change from liquid to solid, releasing the heat stored during the day, suppressing the condensation phenomenon on the surface of the photovoltaic panel 12, protecting the photovoltaic panel 12, and extending its service life.

[0052] It should be noted that the thermoelectric device 33 is based on the Seebeck effect, that is, when there is a temperature difference between the two ends, an electromotive force will be generated in the circuit, thus forming an electric current. In this embodiment, the hot end 331 is fixedly connected to the top of the heat conduction plate 32 because the top is close to the heat conduction plate 32 that absorbs the waste heat of the photovoltaic panel 12 and has a higher temperature.

[0053] During the day, the waste heat generated by the photovoltaic panel 12 is transferred to the heat conduction plate 32 through the phase change material and the flexible frame 31, making the temperature at the top of the heat conduction plate 32 significantly higher than the ambient temperature. The cold end 332 is fixedly connected to the bottom of the inner cavity of the bench body 11. Due to the principle of hot air rising, the temperature at the bottom of the bench body 11 is relatively low, and an obvious temperature difference can be formed with the hot end 331.

[0054] Under such a large temperature difference, the thermal energy can be effectively converted into electrical energy and connected to the load circuit to supply power to electrical equipment such as the connected wireless charging module, further improving the energy comprehensive utilization efficiency of the energy self - supply type photovoltaic bench and expanding its functional application scenarios.

[0055] Based on Embodiment 1 and Embodiment 2, please refer to Figure 10 and Figure 11 As shown, a sunshade column 13 is installed on the outer surface of the bench body 11, and a sunshade plate 14 is installed on the top of the sunshade column 13. The surfaces of the sunshade plate 14 and the sunshade column 13 are provided with photovoltaic materials for increasing power generation. The sunshade plate 14 is rotatably connected to the top of the sunshade column 13, and electric push rods 34 are symmetrically installed between the sunshade column 13 and the sunshade plate 14. An external sensor is arranged inside the bench body 11.

[0056] It should be noted that the electric push rod 34 is fixedly connected to the top of the sunshade column 13. Symmetric sliding grooves are formed on the surface of the sunshade plate 14, and the telescopic end of the electric push rod 34 is slidably connected inside the sliding grooves. The electric push rod 34 is electrically connected to the external sensor, and the external sensor is specifically a gravity sensor.

[0057] Specifically, when someone sits on the bench body 11, the gravity sensor inside the bench body 11 senses the weight change and sends an electrical signal, thereby starting the electric push rod 34.

[0058] At this time, the electric push rod 34 extends and pushes the telescopic end to slide in the sliding groove. Due to the constraint of the sliding groove on the telescopic end, the sunshade plate 14 rotates around the rotation connection point with the top of the sunshade column 13, thereby adjusting the angle of the sunshade plate 14 to provide sunshade service for the person sitting on the bench body 11.

[0059] It should be noted that when the gravity sensor detects that the pressure disappears, it will electrically control the electric push rod 34 to reset.

[0060] It should be noted that in this article, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variant thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device comprising a series of elements not only includes those elements, but also includes other elements not expressly listed, or further includes elements inherent to such process, method, article or device. Without further limitation, an element defined by the statement "comprising an..." does not exclude the presence of additional identical elements in the process, method, article or device comprising the said element.

[0061] Although the embodiments of the present invention have been shown and described, it will be understood by those of ordinary skill in the art that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the present invention, and the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. An energy self-supplying photovoltaic bench, comprising a bench body (11), characterized in that: Inside the stool body (11), several placement cavities (21) are provided. Inside each placement cavity (21), a heater (22) is installed. On both sides of the inner wall of the placement cavity (21), connection ends one (25) are symmetrically installed. The connection ends one (25) are all connected to the internal circuit of the stool body (11). Between each connection end one (25) and the heater (22), a connecting piece (23) is provided. Inside the connecting piece (23) and the placement cavity (21), a reset piece (24) is installed. At both ends of the heater (22), connection ends two are installed; When a user sits down, the gravity of the human body acts on the connecting piece (23), forcing it to form electrical contact with the connection end one (25) and the connection end two. At this time, the circuit is turned on, and the heater (22) starts the heating function to provide a heating function for the user; After the user leaves the seat, the reset piece (24) drives the connecting piece (23) to disengage from the contact point, the circuit is automatically cut off, and the heater (22) stops working.

2. The energy self-supplying photovoltaic bench according to claim 1, characterized in that: The reset piece (24) includes: A reset spring (241), fixedly connected to the bottom of the placement cavity (21); An insulating plate (242), fixedly connected to the top of the reset spring (241) and slidably connected inside the placement cavity (21); The connecting piece (23) includes: A conductive plate (231), fixedly connected between two insulating plates (242); An insulating column (232), fixedly connected to the top of the conductive plate (231).

3. The energy self - supply type photovoltaic bench according to claim 1, characterized in that: On the surface of the stool body (11), a hole for the insulating column (232) to slide through is provided.

4. The energy self - supply type photovoltaic bench according to claim 1, characterized in that: Inside the stool body (11), a photovoltaic panel (12) is installed. On the outer edge of the photovoltaic panel (12), a flexible frame (31) is installed. Inside the flexible frame (31), a phase change material is filled. On the outer surface of the flexible frame (31), a heat conducting plate (32) is installed. On both sides of the heat conducting plate (32), convex parts (321) are fixedly connected, and the convex parts (321) extend downward and obliquely to the inner surface of the stool body (11).

5. The energy self-supplying photovoltaic bench according to claim 4, characterized in that: Inside the stool body (11), several fins (322) are symmetrically installed. Both sides of the fins (322) are located outside the stool body (11), and the convex parts (321) are in contact with the fins (322). The flexible frame (31) is adhered to the outer surface of the photovoltaic panel (12), and the heat conducting plate (32) is fixedly connected to the top of the inner cavity of the stool body (11).

6. The energy self-supplying photovoltaic bench according to claim 5, wherein: Inside the stool body (11), a thermoelectric device (33) is installed, and the thermoelectric device (33) is connected to a load circuit.

7. The energy self-supplying photovoltaic bench according to claim 6, characterized in that: The thermoelectric device (33) includes: A hot end (331), fixedly connected to the top of the heat conducting plate (32); A cold end (332), fixedly connected to the bottom of the inner cavity of the stool body (11); The thermoelectric device (33) is made of bismuth telluride-based material.

8. An energy self-supplying photovoltaic bench according to any one of claims 1-7, characterized in that: On the outer surface of the stool body (11), a sunshade column (13) is installed. On the top of the sunshade column (13), a sunshade plate (14) is installed. On the surfaces of the sunshade plate (14) and the sunshade column (13), photovoltaic materials are provided.

9. The energy self-supplying photovoltaic bench according to claim 8, wherein: The sun visor (14) is rotatably connected to the top of the sunshade column (13), and electric push rods (34) are symmetrically installed between the sunshade column (13) and the sun visor (14). An external sensor is arranged inside the stool body (11).

10. The energy self-supplying photovoltaic bench according to claim 9, characterized in that: The electric push rod (34) is fixedly connected to the top of the sunshade column (13). Chute grooves are symmetrically formed on the surface of the sun visor (14). The telescopic end of the electric push rod (34) is slidably connected to the inside of the chute grooves. The electric push rod (34) is electrically connected to the external sensor.

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