A power-generating curtain wall assembly

Abstract

This invention relates to the field of curtain wall building technology and proposes a power-generating curtain wall assembly. The assembly includes a fixing frame, a glass panel, a photovoltaic panel, a connector, and a thermal expansion member. The glass panel is fixedly mounted on the fixing frame. The photovoltaic panel is rotatably mounted on the glass panel via the connector, and the area of ​​the photovoltaic panel is smaller than the area of ​​the glass panel. The thermal expansion member is positioned between the glass panel and the photovoltaic panel. When sunlight shines on the photovoltaic panel, it casts a shadow on the glass panel. In its natural state, the photovoltaic panel is parallel to the glass panel. When sunlight shines on the curtain wall assembly, the thermal expansion member expands and resists the rotation of the photovoltaic panel. This invention, by setting a photovoltaic panel rotatably connected to a glass panel and incorporating a thermal expansion member on the glass panel, allows the photovoltaic panel to dynamically adjust its tilt angle according to the light intensity, simultaneously improving photovoltaic power generation efficiency and building interior cooling effects, thereby enhancing the building's energy-saving performance.

Description

Technical Field

[0001] This invention relates to the field of curtain wall building technology, and more particularly to a power generation curtain wall component. Background Technology

[0002] With the increasing global emphasis on energy conservation, emission reduction, and the utilization of renewable energy, Building Integrated Photovoltaics (BIPV) technology has become a key direction for the development of green buildings. BIPV technology directly integrates photovoltaic power generation into the building envelope (such as curtain walls and roofs), replacing traditional building materials and providing electricity while meeting architectural aesthetics and structural requirements.

[0003] Currently, the main technical solutions for power generation components used in building curtain walls are as follows:

[0004] Fixed photovoltaic (PV) curtain walls: This is the most common application. PV panels are fixedly installed to the curtain wall frame or directly laminated into the glass interlayer, maintaining a fixed angle with the building facade. This type of solution has a simple structure and relatively low cost. However, it has significant drawbacks: First, the power generation efficiency of PV panels is greatly affected by the angle of solar incidence; a fixed angle cannot guarantee that they will always be at the optimal tilt angle for power generation throughout the day and year, resulting in low overall power generation efficiency. Second, PV panels are usually made of opaque or semi-transparent materials, and their fixed positions will create permanent shadows indoors. This not only affects the uniformity of indoor lighting but also fails to effectively shade non-PV areas during strong summer sunlight, allowing a large amount of solar radiation heat to enter the room, significantly increasing the building's air conditioning cooling load and weakening the energy-saving effect.

[0005] Externally driven adjustable photovoltaic systems: To improve power generation efficiency, some solutions involve installing independent photovoltaic arrays with tracking brackets on building rooftops or balconies, or adding mechanical adjustment devices such as motors and hydraulic drives to curtain wall photovoltaic panels. These systems can adjust the angle of the photovoltaic panels according to the sun's position, thereby maximizing power generation. However, their drawbacks are also significant: First, they require complex photosensors, central controllers, and power actuators, resulting in high initial investment; second, the external mechanical structure and drive devices detract from the overall aesthetics of the building facade; third, the system is exposed to harsh outdoor environments for extended periods, making drive components prone to failure, leading to high maintenance costs and unreliable reliability; finally, the additional energy consumption (for drive adjustment) partially offsets the increased power generation revenue.

[0006] In summary, existing power-generating curtain wall technologies struggle to achieve a good balance across several key dimensions, including high-efficiency power generation, dynamic shading, architectural aesthetics, low cost, and low maintenance. They either sacrifice efficiency and adaptability for structural simplicity or introduce high costs and complex systems to improve performance. Therefore, the market urgently needs an intelligent, low-maintenance power-generating curtain wall solution that can self-sensitize, self-drive, and adapt to environmental changes, without relying on external power and control systems. Summary of the Invention

[0007] In view of this, the present invention proposes a power generation curtain wall component that does not require an external power and control system, and achieves simultaneous optimization of photovoltaic power generation efficiency and building indoor cooling.

[0008] The technical solution of this invention is implemented as follows: This invention provides a power generation curtain wall assembly, including a fixing frame, a glass panel, a photovoltaic panel, a connector, and a thermal expansion member. The glass panel is fixedly mounted on the fixing frame; the photovoltaic panel is rotatably mounted on the glass panel via the connector, and the area of ​​the photovoltaic panel is smaller than the area of ​​the glass panel; the thermal expansion member is disposed between the glass panel and the photovoltaic panel; when sunlight shines on the photovoltaic panel, a shadow is formed on the glass panel; in its natural state, the photovoltaic panel is parallel to the glass panel, and the area of ​​the shadow is 'a'; when sunlight shines on the curtain wall assembly, the thermal expansion member expands and resists the rotation of the photovoltaic panel, and the area of ​​the shadow is 'b', where b > a.

[0009] Based on the above technical solutions, preferably, the connector includes a slide rail and a slide base, the slide rail being fixedly mounted on the glass plate; the slide base being slidably mounted on the slide rail and rotatably connected to the photovoltaic panel.

[0010] Based on the above technical solutions, preferably, the slide rail is circular and the photovoltaic panel is circular.

[0011] Based on the above technical solutions, preferably, the thermal expansion member abuts against the center of the photovoltaic panel.

[0012] Based on the above technical solutions, preferably, the thermal expansion component includes an elastic telescopic airbag, which is fixedly mounted on the glass plate and abuts against the photovoltaic panel.

[0013] Based on the above technical solutions, preferably, the thermal expansion component further includes a heat insulation airbag and a connecting pipe. The heat insulation airbag is fixedly disposed on the side of the glass plate away from the elastic telescopic airbag and located inside the fixing frame. The connecting pipe is disposed between the elastic telescopic airbag and the heat insulation airbag.

[0014] Based on the above technical solutions, preferably, the heat insulation airbag has an air vent on its side wall, and the air vent is connected to the interior of the heat insulation airbag.

[0015] Based on the above technical solutions, preferably, a limiting mechanism is also included, the limiting mechanism comprising a base, a top seat, and a tension spring, the base being connected to the glass plate; the top seat being fixedly mounted on the photovoltaic plate; and the two ends of the tension spring being fixedly mounted on the base and the top seat, respectively.

[0016] Based on the above technical solutions, preferably, the connector further includes a cooperating seat, which is slidably disposed on the slide rail and opposite to the slide block, and the cooperating seat is fixedly connected to the base.

[0017] Based on the above technical solutions, preferably, the base is provided with a threaded hole, the top seat abuts against the base, and the top seat has a mounting cavity on the side near the base, with the tension spring located in the mounting cavity; the limiting mechanism further includes a screw, a holding rod, and a nut, the screw is rotatably and slidably disposed on the top seat, and one end of the screw is located inside the tension spring and can be threadedly connected to the threaded hole; the holding rod is rotatably disposed on the screw, and both ends of the holding rod are slidably disposed on the tension spring; the nut is threadedly connected to the screw and abuts against the side of the top seat away from the base.

[0018] The power generation curtain wall assembly of the present invention has the following advantages over the prior art:

[0019] (1) By setting up a photovoltaic panel that is rotatably connected to the glass plate and setting a thermal expansion component on the glass plate, the photovoltaic panel can dynamically adjust its tilt angle according to the light intensity, thereby simultaneously improving the photovoltaic power generation efficiency and the indoor cooling effect of the building, and enhancing the building's energy-saving performance.

[0020] (2) By setting the connector to include a slide rail and a slide base, and setting the slide rail to a circular shape, the rotation direction of the photovoltaic panel can be adjusted, thus broadening the applicability of this curtain wall component.

[0021] (3) By setting a limiting mechanism, and setting the limiting mechanism to include a base, a top seat, a tension spring, a screw, a support rod and a nut, it can not only pull the photovoltaic panel in real time and improve the structural stability of the photovoltaic panel, but also adjust the rotation range of the photovoltaic panel, further improving the adaptability of this curtain wall component. Attached Figure Description

[0022] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0023] Figure 1 This is a perspective view of a power generation curtain wall assembly according to the present invention, showing its natural state.

[0024] Figure 2 This is a perspective view of a power-generating curtain wall assembly according to the present invention, showing the state of the curtain wall assembly when sunlight shines on it.

[0025] Figure 3 This is a cross-sectional view of the photovoltaic panel in a power generation curtain wall assembly according to the present invention.

[0026] Figure 4 This is a perspective view of the thermal expansion component in a power generation curtain wall assembly according to the present invention.

[0027] Figure 5 This is a cross-sectional view of the sliding seat in a power generation curtain wall assembly according to the present invention.

[0028] Figure 6 This is a cross-sectional view of the thermal expansion member in a power generation curtain wall assembly according to the present invention.

[0029] Figure 7 This is a perspective view of the heat insulation airbag in a power generation curtain wall assembly according to the present invention.

[0030] Figure 8 This is a perspective view of the glass panel in a power generation curtain wall assembly according to the present invention.

[0031] Figure 9 This is a cross-sectional view of the limiting mechanism in a power generation curtain wall assembly according to the present invention.

[0032] Figure 10 This is a cross-sectional view of the fixing frame and glass panel in a power generation curtain wall assembly according to the present invention.

[0033] The components include: 1. Fixing frame; 2. Glass plate; 3. Photovoltaic panel; 4. Connector; 41. Slide rail; 42. Slide base; 43. Coordinating seat; 5. Thermal expansion component; 51. Elastic telescopic airbag; 52. Heat insulation airbag; 53. Connecting pipe; 501. Air port; 6. Limiting mechanism; 61. Base; 62. Top seat; 63. Tension spring; 64. Screw; 65. Support rod; 66. Nut; 601. Threaded hole; 602. Mounting cavity. Detailed Implementation

[0034] The technical solutions of this invention will be clearly and completely described below with reference to specific embodiments. Obviously, the described embodiments are only a part of the embodiments of this invention, and not all of them. Based on the embodiments of this invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this invention.

[0035] The present invention provides a power generation curtain wall assembly, comprising a fixing frame 1, a glass plate 2, a photovoltaic panel 3, a connector 4, a thermal expansion member 5, and a limiting mechanism 6, for installation on a building wall.

[0036] The mounting bracket 1 includes multiple longitudinal beams, transverse beams, and clamping components. The longitudinal and transverse beams are arranged in a grid pattern and fixed to the wall. The clamping components are fixedly mounted on the longitudinal and transverse beams, such as... Figure 10 As shown, the clamping member clamps and fixes the edge of the glass plate 2, fixes the glass plate 2 on the fixing frame 1, and then fixes the glass plate 2 to the wall.

[0037] The photovoltaic panel 3 is an important component of the photovoltaic power generation system. It is installed on the side of the glass panel 2 away from the wall via the connector 4. When sunlight shines on the photovoltaic panel 3, the photovoltaic power generation system generates electricity to power the equipment inside the building.

[0038] The photovoltaic panel 3 is an opaque or low-transmittance medium. When sunlight shines on the photovoltaic panel 3, it will form a shadow on the glass panel 2, thereby reducing the brightness inside the building.

[0039] The area of ​​photovoltaic panel 3 is smaller than that of glass panel 2. Photovoltaic panel 3 is rotatably mounted on glass panel 2 via connector 4. Thermal expansion member 5 is disposed between glass panel 2 and photovoltaic panel 3.

[0040] Thermal expansion component 5 refers to a component that can expand or elongate when heated. For example... Figure 3 As shown, under natural conditions, the thermal expansion member 5 is in its original state, and the photovoltaic panel 3 is in a position parallel to the glass panel 2. When sunlight shines on the curtain wall assembly, the thermal expansion member 5 is heated and expands. The expanded thermal expansion member 5 will resist the photovoltaic panel 3 and push the photovoltaic panel 3 to rotate, causing the photovoltaic panel 3 to tilt relative to the glass panel 2.

[0041] The natural state refers to the working condition where the thermal expansion component 5 is in its original state, such as on a cloudy day, at night, or in weather with low light intensity. As the light intensity increases, the expansion degree of the thermal expansion component 5 increases accordingly, causing the angle between the photovoltaic panel 3 and the glass panel 2 to become larger and larger.

[0042] Assuming the area of ​​the shadow under natural conditions is a, and the area of ​​the shadow when the photovoltaic panel 3 is tilted is b, then b > a. That is, the greater the light intensity, the larger the area of ​​the shadow, which can reduce the amount of sunlight directly passing through the glass panel 2 and effectively reduce the indoor temperature of the building. At the same time, as the light intensity increases, the photovoltaic panel 3 gradually tilts, making the angle between the photovoltaic panel 3 and the incident light direction closer and closer to a right angle, which helps to increase the power generation of the photovoltaic power generation system.

[0043] In its natural state, the photovoltaic panel 3 maintains planar consistency, preserving the integrity of the building facade and facilitating centralized and unified cleaning of multiple photovoltaic panels 3. As sunlight intensity increases, shading and cooling, along with improved photovoltaic power generation efficiency, are simultaneously achieved. Meanwhile, the dynamic tilting process creates variations in light and shadow on the building facade, giving it dynamic aesthetic characteristics. The layout of the photovoltaic panel 3 can be customized according to architectural design requirements, achieving a balance between functionality and aesthetics. The photovoltaic panel 3 requires no external power supply, sensors, or control system, relying entirely on the thermal expansion component 5 for self-driven adjustment, thereby reducing the initial installation cost and subsequent maintenance cost of the curtain wall components.

[0044] In buildings in hot-summer and warm-winter regions, photovoltaic panels 3 automatically increase the shading area during high-temperature periods, reducing indoor air conditioning load and resulting in significant energy savings throughout the year, adapting to long-term sunshine environments; in high-rise office buildings, the curtain wall can be dynamically adjusted according to needs to adapt to the lighting conditions of different floors; in the energy-saving renovation of existing buildings, no complex structural modifications are required, and it can be directly adapted to the existing curtain wall system.

[0045] In a preferred embodiment, the connector 4 includes a slide rail 41 and a slide block 42. The slide rail 41 is fixedly mounted on the glass plate 2, and the slide block 42 is slidably mounted on the slide rail 41 and rotatably connected to the photovoltaic panel 3. When the slide block 42 is slid, the position of the photovoltaic panel 3 can be adjusted, so that the photovoltaic panel 3 can be adapted to different building floors or walls facing different directions on the building.

[0046] The slide rail 41 is preferably circular, and the photovoltaic panel 3 is also circular. When the sliding block 42 is slidable, the photovoltaic panel 3 can rotate in different directions, thereby improving the adaptability of this curtain wall component.

[0047] For example, when the photovoltaic panel 3 is located on the east or west wall of the building, adjusting the slide block 42 can better orient the photovoltaic panel 3 towards the sun, thereby improving the power generation efficiency of the photovoltaic panel 3. When it is necessary to reduce power generation and increase the light transmittance of the curtain wall components, the slide block 42 can be slid to the position below the slide rail 41. At this time, the shadow area formed by the rotating photovoltaic panel 3 is reduced, thereby allowing more sunlight to directly shine into the room.

[0048] Preferably, the thermal expansion member 5 is positioned to abut against the center of the photovoltaic panel 3. When the slide 42 moves to different positions, the position of the thermal expansion member 5 does not need to move, and the relationship between the degree of expansion of the thermal expansion member 5 and the rotation angle of the photovoltaic panel 3 remains stable.

[0049] The thermal expansion element 5 automatically drives the photovoltaic panel 3 to rotate after being heated. Existing technologies employ various structures, such as those using thermally expanding metals. However, in this application, the photovoltaic panel 3 requires a larger rotation range. Therefore, the thermal expansion element 5 is preferably configured to include an elastic telescopic airbag 51, a heat-insulating airbag 52, and a connecting pipe 53. The elastic telescopic airbag 51 is fixedly mounted on the glass plate 2 and abuts against the photovoltaic panel 3. The heat-insulating airbag 52 is fixedly mounted on the side of the glass plate 2 away from the elastic telescopic airbag 51. The connecting pipe 53 connects the elastic telescopic airbag 51 and the heat-insulating airbag 52. Both the heat-insulating airbag 52 and the elastic telescopic airbag 51 have cavities to store gases with high thermal expansion coefficients. The heat-insulating airbag 52 is made of a harder material, while the elastic telescopic airbag 51 is made of an elastic material. When the gas inside the heat-insulating airbag 52 and the elastic telescopic airbag 51 expands due to heat, it causes the elastic telescopic airbag 51 to bulge outwards, pushing the photovoltaic panel 3 outwards, thereby driving the photovoltaic panel 3.

[0050] In many operating conditions, the rotation angle of the photovoltaic panel 3 needs to be controlled by human intervention. Therefore, an air vent 501 is opened on the side wall of the heat insulation airbag 52, and the air vent 501 is connected to the interior of the heat insulation airbag 52. When the air vent 501 is exposed or air is drawn from the air vent 501 by equipment, the elastic telescopic airbag 51 will not expand due to heat, and the photovoltaic panel 3 will not rotate due to heat. When air is injected into the air vent 501, the elastic telescopic airbag 51 can be actively driven to expand, pushing the photovoltaic panel 3 to rotate, and the rotation angle of the photovoltaic panel 3 can be adjusted by controlling the amount of air injected.

[0051] like Figure 7 As shown, the heat insulation airbag 52 is preferably a cuboid structure, and the heat insulation airbag 52 is located between the crossbeams and longitudinal beams of the fixing frame 1 to fill the gap between the glass plate 2 and the wall and improve the heat insulation and sound insulation effect of the building.

[0052] The above technical solution describes a structure in which the photovoltaic panel 3 rotates due to the thermal expansion component 5 expanding under heat. However, when the thermal expansion component 5 cools and contracts, it is also necessary for the photovoltaic panel 3 to rotate in the opposite direction. To this end, the elastic telescopic airbag 51 can be fixedly connected to the photovoltaic panel 3, so that the expansion and contraction of the elastic telescopic airbag 51 can actively control the rotation out and back of the photovoltaic panel 3, thereby enabling the photovoltaic panel 3 to rotate back and forth. Of course, the elastic telescopic airbag 51 can also be not fixedly connected to the photovoltaic panel 3, but a pulling force in the direction of rotation can be applied to the photovoltaic panel 3 through the limiting mechanism 6 to improve the structural stability of the photovoltaic panel 3.

[0053] The limiting mechanism 6 includes a base 61, a top seat 62, a tension spring 63, a screw 64, a supporting rod 65, and a nut 66. The connecting member 4 also includes a cooperating seat 43, which is slidably mounted on the slide rail 41 and is positioned opposite to the slide seat 42. The base 61 is fixedly mounted on the cooperating seat 43, establishing a connection between the base 61 and the glass plate 2. The top seat 62 is fixedly mounted on the photovoltaic panel 3. The two ends of the tension spring 63 are respectively fixedly mounted on the base 61 and the top seat 62. The tension spring 63 applies a pulling force towards the glass plate 2 to the photovoltaic panel 3, thereby enabling the photovoltaic panel 3 to rotate towards the glass plate 2 when the thermal expansion member 5 contracts.

[0054] In its natural state, the top seat 62 abuts against the base 61, and the side of the top seat 62 closest to the base 61 has a mounting cavity 602. The tension spring 63 is located in the mounting cavity 602. The screw 64 is rotatably and slidably mounted on the top seat 62, and one end of the screw 64 is located in the tension spring 63. The abutting rod 65 is rotatably mounted on the screw 64, and both ends of the abutting rod 65 are slidably mounted on the tension spring 63. The nut 66 is threadedly connected to the screw 64 and abuts against the side of the top seat 62 away from the base 61.

[0055] like Figure 9 As shown, when the nut 66 is turned, the screw 64 can be moved to the left, thereby moving the abutment rod 65 to fix the tension spring 63 at the position to the left of the abutment rod 65, so that the part of the tension spring 63 located to the left of the abutment rod 65 loses its extension and retraction function, thereby limiting the range of motion of the photovoltaic panel 3; when the screw 64 is rotated, the two ends of the abutment rod 65 can be moved to different positions of the tension spring 63, thereby adjusting the range of motion of the photovoltaic panel 3.

[0056] like Figure 9 As shown, the base 61 is provided with a threaded hole 601. When the screw 64 slides to the right and rotates, it can be connected with the threaded hole 601 through threaded engagement, thereby realizing the fixed connection between the base 61 and the top seat 62, restricting the rotation of the photovoltaic panel 3, and enabling the photovoltaic panel 3 to adapt to different working conditions.

[0057] When it is necessary to adjust the rotation direction of the photovoltaic panel 3, the screw 64 should be screwed into the threaded hole 601 first to fix the photovoltaic panel 3 to the cooperating seat 43. At this time, rotating the photovoltaic panel 3 will drive the slide 42 and the cooperating seat 43 to move synchronously.

[0058] To meet aesthetic and other requirements, such as Figure 1 As shown, triangular-shaped panels can also be installed around the photovoltaic panel 3. These panels can be fixed photovoltaic panels 3, glass panels 2, or other panels with color or other effects. These panels can be used in conjunction with photovoltaic panels 3 to further enrich the functions of the curtain wall components.

[0059] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A power-generating curtain wall component, characterized in that: It includes a fixing frame (1), a glass plate (2), a photovoltaic panel (3), a connector (4), and a thermal expansion component (5), wherein, The glass plate (2) is fixedly mounted on the fixing frame (1); The photovoltaic panel (3) is rotatably mounted on the glass plate (2) via the connector (4), and the area of ​​the photovoltaic panel (3) is smaller than the area of ​​the glass plate (2); The thermal expansion member (5) is disposed between the glass plate (2) and the photovoltaic plate (3); When sunlight shines on the photovoltaic panel (3), a shadow is formed on the glass panel (2); in the natural state, the photovoltaic panel (3) is parallel to the glass panel (2), and the area of ​​the shadow is a; when sunlight shines on the curtain wall assembly, the thermal expansion member (5) expands and supports the photovoltaic panel (3) to rotate, and the area of ​​the shadow is b, and b > a.

2. A power-generating curtain wall assembly according to claim 1, wherein: The connector (4) includes a slide rail (41) and a slide base (42). The slide rail (41) is fixedly mounted on the glass plate (2). The slide base (42) is slidably mounted on the slide rail (41) and is rotatably connected to the photovoltaic panel (3).

3. A power-generating curtain wall assembly according to claim 2, wherein: The slide rail (41) is circular, and the photovoltaic panel (3) is circular.

4. A power-generating curtain wall assembly according to claim 3, wherein: The thermal expansion member (5) abuts against the center of the photovoltaic panel (3).

5. A power-generating curtain wall assembly according to claim 1, wherein: The thermal expansion member (5) includes an elastic telescopic airbag (51), which is fixedly mounted on the glass plate (2) and abuts against the photovoltaic plate (3).

6. A power-generating curtain wall assembly according to claim 5, wherein: The thermal expansion member (5) also includes a heat insulation airbag (52) and a connecting pipe (53). The heat insulation airbag (52) is fixedly disposed on the side of the glass plate (2) away from the elastic telescopic airbag (51) and located inside the fixing frame (1). The connecting pipe (53) is connected between the elastic telescopic airbag (51) and the heat insulation airbag (52).

7. A power-generating curtain wall assembly according to claim 6, wherein: The heat insulation airbag (52) has an air vent (501) on its side wall, and the air vent (501) is connected to the interior of the heat insulation airbag (52).

8. A power-generating curtain wall assembly according to claim 3, wherein: It also includes a limiting mechanism (6), which includes a base (61), a top seat (62) and a tension spring (63). The base (61) is connected to the glass plate (2); the top seat (62) is fixedly mounted on the photovoltaic panel (3); and the two ends of the tension spring (63) are fixedly mounted on the base (61) and the top seat (62) respectively.

9. A power-generating curtain wall assembly according to claim 8, wherein: The connector (4) also includes a cooperating seat (43), which is slidably disposed on the slide rail (41) and is disposed opposite to the slide block (42), and the cooperating seat (43) is fixedly connected to the base (61).

10. A power-generating curtain wall assembly according to claim 9, wherein: The base (61) is provided with a threaded hole (601), the top seat (62) abuts against the base (61), and the top seat (62) is provided with a mounting cavity (602) on the side near the base (61), and the tension spring (63) is located in the mounting cavity (602); The limiting mechanism (6) further includes a screw (64), a retaining rod (65), and a nut (66). The screw (64) is rotatably and slidably disposed on the top seat (62), and one end of the screw (64) is located inside the tension spring (63) and can be threadedly connected to the threaded hole (601). The retaining rod (65) is rotatably disposed on the screw (64), and both ends of the retaining rod (65) are slidably disposed on the tension spring (63). The nut (66) is threadedly connected to the screw (64) and abuts against the side of the top seat (62) away from the base (61).

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