Wind Resistance Reinforcement System of Flat Single-Axis Photovoltaic Bracket System

Abstract

The present invention belongs to the field of photovoltaic technology, and specifically discloses a wind-resistant reinforcement system for a flat single-axis photovoltaic support system, which includes a connecting beam, a steel wire rope, and a steel wire rope length adjustment device. The connecting beam is arranged on both sides of the main shaft main beam at the bottom surface of the photovoltaic panel, between two adjacent transverse support beams, and is fixedly connected to the two adjacent transverse support beams; a steel wire rope length adjustment device for adjusting the length of the steel wire rope is installed on each column. After the steel wire rope is wound around the length adjustment device, its first end is fixedly connected to the connecting beam on one side of the main shaft main beam, and its second end is fixedly connected to the connecting beam on the other side of the main shaft main beam. The present invention improves the stress state in the flat single-axis photovoltaic support system, reduces the concentrated force, and enhances the strength and stability of the flat single-axis photovoltaic support system. The present invention is applicable to the flat single-axis photovoltaic support system.

Description

Technical Field

[0001] The present invention belongs to the technical field of photovoltaics, and relates to wind resistance reinforcement, specifically to a wind resistance reinforcement system for a flat single-axis photovoltaic support system. Background Art

[0002] Renewable energy such as solar energy is the preferred energy source to solve environmental pollution and achieve sustainable development. Currently, solar energy

[0003] is commonly converted into electrical energy using photovoltaic panels. However, the phenomenon of the support mechanism of photovoltaic panels being damaged by strong winds is relatively common. The general form of the support mechanism is basically column → rotating mechanism system → main shaft → flat support system → photovoltaic panel. The rotating mechanism system undertakes the function of tracking the sun for the photovoltaic panel, and at the same time undertakes all the structural loads of the photovoltaic panel and its flat support system in various states. With the combination of static and dynamic loads, the stress states such as tension, compression, bending, shear, and torsion are compounded and superimposed, and the stress state is relatively complex. The stress at the joints is very large, and the rotating mechanism and the main shaft become the weak points of the overall structure. Most of the existing photovoltaic systems maintain the flat single-axis photovoltaic support system in a wind-resistant horizontal position by locking the rotating actuator. Since the strength of the rotating actuator is usually much lower than that of the fixed structure system, and its ability to control deformation is weak. Under extreme weather conditions such as strong winds, the general design model of the photovoltaic system is the minimum windward state with the photovoltaic panel placed horizontally and locked to ensure the safety of the system with the minimum stress state. However, in the actual wind field, there are many influencing factors for the support mechanism of the photovoltaic system. The air flow is close to the ground and affected by the surrounding environment, and the influence of multiple groups of photovoltaic systems changing the wind direction. The states of turbulence, eddy current, etc. in the wind field are very complex; the photovoltaic system is subjected to large, fluctuating, and uneven distributed loads, and the support mechanism will vibrate, fluctuate, and swing, and then a stress state beyond the design model will occur; the dynamic action causes deformation, the deformation increases the stress, and the increased stress increases the deformation, resulting in a vicious cycle until the rotating actuator is damaged, the system is distorted, overturned, and collapsed. Summary of the Invention

[0004] The purpose of the present invention is to provide a wind resistance reinforcement system for a flat single-axis photovoltaic support system to increase the anti-torsion stiffness of the flat single-axis photovoltaic support system, and at the same time ensure the rotational characteristics of the flat single-axis photovoltaic support system during normal use.

[0005] The technical methods adopted by the present invention to achieve the above purpose are as follows:

[0006] An anti-wind reinforcement system for a flat single-axis photovoltaic support system, which is set based on the flat single-axis photovoltaic support system. The flat single-axis photovoltaic support system includes a photovoltaic panel, a transverse support beam, a column, a main shaft girder, a rotating mechanism and an automatic control mechanism. A plurality of transverse support beams and a main shaft girder perpendicular to the transverse support beam are arranged on the bottom surface of the photovoltaic panel. A plurality of columns arranged in rows are rotatably connected to the main shaft girder through the rotating mechanism. The automatic control mechanism is connected to the rotating mechanism to control the rotation of the photovoltaic panel. The anti-wind reinforcement system of the flat single-axis photovoltaic support system includes a connecting beam, a steel wire rope and a steel wire rope length adjusting device. The connecting beam is arranged on both sides of the main shaft girder on the bottom surface of the photovoltaic panel, between adjacent two transverse support beams, and is fixedly connected to the adjacent two transverse support beams; a steel wire rope length adjusting device for adjusting the length of the steel wire rope is installed on each column. After the steel wire rope is wound around the length adjusting device, its first end is fixedly connected to the connecting beam on one side of the main shaft girder, and its second end is fixedly connected to the connecting beam on the other side of the main shaft girder.

[0007] As a limitation: a limit mechanism linked with the automatic control mechanism is installed on the steel wire rope length adjusting device. After the length of the steel wire rope is adjusted, the automatic control mechanism controls the limit mechanism to lock the steel wire rope length adjusting device.

[0008] As a further limitation: the steel wire rope length adjusting device is an elastic self-locking shaft pulley. The elastic self-locking shaft pulley includes a pulley. A core shaft is arranged at the center position inside the pulley. Eight slide rails are arranged along the radius direction of the pulley with respect to the core shaft. The angle between adjacent two slide rails is 45°. A resilient shaft slider adapted to each slide rail is installed on each slide rail. The steel wire rope is wound on the outer surfaces of the eight resilient shaft sliders away from the core shaft. The first end of the core shaft sequentially passes through the pulley housing, the column and the valve hole of the clamp solenoid valve in the limit mechanism. A relay is also included in the limit mechanism. The clamp solenoid valve is connected to the automatic control mechanism through the relay. An annular resistance increasing groove is arranged on the core shaft. The position of the annular resistance increasing groove on the core shaft corresponds to the clamping position of the clamp solenoid valve when the photovoltaic panel is in a horizontal position; the second end of the core shaft passes through the pulley housing and is sleeved with a spring. One end of the spring is fixedly arranged on the pulley housing, and the other end of the spring is fixed to the second end of the core shaft. An umbrella bone support frame is also fixedly arranged at the second end of the core shaft. The umbrella bone support frame includes eight support frames. The first end of each support frame is fixedly connected to its core shaft, and the second end of each support frame is connected to its corresponding resilient shaft slider. The first surface of the pulley housing is provided with a chute adapted to the eight support frames for the eight support frames of the umbrella bone support frame to slide. The second surface of the pulley housing is fixed on the column.

[0009] As another limitation: The wire rope length adjustment device is two automatic rebound wheels, namely the first automatic rebound wheel and the second automatic rebound wheel. The first automatic rebound wheel and the second automatic rebound wheel are respectively installed on both sides of the column. The center positions of the first automatic rebound wheel and the second automatic rebound wheel are both provided with a central shaft. A clockwork spring is arranged on the central shaft. One end of the clockwork spring is fixedly arranged on the neutral axis. Two wire ropes are respectively fixedly connected to the other ends of the clockwork springs in the first automatic rebound wheel and the second automatic rebound wheel. The two wire ropes are respectively wound around the outer circles of the clockwork springs in the first automatic rebound wheel and the second automatic rebound wheel. The first end of one wire rope passes through the wire rope outlet of the first automatic rebound wheel and is fixedly connected to the connecting beam on one side of the main shaft main beam. The second end of the other wire rope passes through the wire rope outlet of the second automatic rebound wheel and is fixedly connected to the connecting beam on the other side of the main shaft main beam; The limiting mechanism includes a clamping clip and an electric bolt. Clamping clips are arranged at the wire rope outlets of the first automatic rebound wheel and the second automatic rebound wheel. Electric bolts are arranged on the outer sides of the clamping clips. The electric bolts are connected to the automatic control system.

[0010] As the third limitation: The adjustment device is a sliding wheel shaft device. The sliding wheel shaft device includes a pulley. The wire rope is wound around the pulley. Reinforcing plates are arranged on both the first surface and the second surface of the pulley housing. A positioning bolt is fixedly arranged between the reinforcing plates on the first surface and the second surface. One end of a spring is connected to the positioning bolt. The other end of the spring is fixedly connected to a fixed frame. The fixed frame is fixedly installed on one side of the column. A vertical sliding rail adapted to the positioning bolt is arranged inside the fixed frame. A limiting mechanism is fixedly installed on the other side of the column. The limiting mechanism includes an electric bolt. The electric bolt is connected to the automatic control system. A locking hole adapted to the electric bolt is arranged on the pulley.

[0011] Due to the adoption of the above scheme, the beneficial effects obtained by the present invention compared with the prior art are as follows:

[0012] (1) For an anti-wind reinforcement system of a flat single-axis photovoltaic support system provided by the present invention, by arranging a connecting beam and a wire rope, the torsional load at the root of the main shaft main beam in the flat single-axis photovoltaic support system is dispersed to each pillar position, improving the stress state in the flat single-axis photovoltaic support system, reducing the concentrated force, and enhancing the strength and stability of the flat single-axis photovoltaic support system;

[0013] (2) For an anti-wind reinforcement system of a flat single-axis photovoltaic support system provided by the present invention, by locking the relative lengths between the two ends of the wire rope and the three fixed points of the wire rope length adjustment device, the amplitude can be effectively restricted when the photovoltaic panel sways and fluctuates under the wind, the wind load can be transmitted, and the torque received by the main shaft main beam is converted into the axial force of each component of the system, greatly optimizing the stress state of each component and reducing the deformation amount and internal stress of the system;

[0014] (3) The wind resistance reinforcement system of a flat single-axis photovoltaic support system provided by the present invention utilizes the characteristics of high tensile strength and zero compressive strength of the steel wire rope, and forms a flexible restraint wind resistance reinforcement system in cooperation with the flat single-axis photovoltaic support system, achieving a certain damping effect and further reducing the internal stress of the flat single-axis photovoltaic support system.

[0015] The present invention is applicable to a flat single-axis photovoltaic support system. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0017] Figure 1 is a schematic structural diagram of the flat single-axis photovoltaic support system and the wind resistance reinforcement system of Embodiment 1 of the present invention;

[0018] Figure 2 is a schematic structural diagram of the wind resistance reinforcement system of the flat single-axis photovoltaic support system of Embodiment 1 of the present invention;

[0019] Figure 3 is a schematic structural diagram of the installation position of the wind resistance reinforcement system of the flat single-axis photovoltaic support system of Embodiment 1 of the present invention;

[0020] Figure 4 is a front view of the umbrella rib type support frame in the contracted state of the steel wire rope length adjusting device of Embodiment 1 of the present invention;

[0021] Figure 5 is a left view of the umbrella rib type support frame in the contracted state of the steel wire rope length adjusting device of Embodiment 1 of the present invention;

[0022] Figure 6 is a cross-sectional view of the umbrella rib type support frame in the contracted state of the steel wire rope length adjusting device of Embodiment 1 of the present invention;

[0023] Figure 7 is a front view of the umbrella rib type support frame in the expanded state of the steel wire rope length adjusting device of Embodiment 1 of the present invention;

[0024] Figure 8 is a left view of the umbrella rib type support frame in the expanded state of the steel wire rope length adjusting device of Embodiment 1 of the present invention;

[0025] Figure 9 is a cross-sectional view of the umbrella rib type support frame in the expanded state of the steel wire rope length adjusting device of Embodiment 1 of the present invention;

[0026] Figure 10 is a schematic cross-sectional view of the steel wire rope length adjusting device of Embodiment 2 of the present invention;

[0027] Figure 11 is a schematic cross-sectional view of the front of the steel wire rope length adjusting device of Embodiment 3 of the present invention;

[0028] Figure 12 Schematic cross-sectional view of the side of the wire rope length adjusting device according to Embodiment 3 of the present invention;

[0029] In the figure: 1, photovoltaic panel; 2, main shaft girder; 3, transverse support beam; 4, column; 5, connecting beam; 6, wire rope; 7, wire rope length adjusting device; 8, core shaft; 9, support frame; 10, chute; 11, elastic shaft slider; 12, slide rail; 13, spring; 14, limit mechanism; 15, annular resistance increasing groove; 16, pulley; 17, central shaft; 18, clockwork spring; 19, clamp; 20, electric bolt; 21, fixed frame; 22, stiffening plate; 23, sliding slide rail; 24, positioning bolt; 25, locking hole. Detailed implementation manners

[0030] The present invention will be further described below in conjunction with embodiments. However, those skilled in the art should understand that the present invention is not limited to the following embodiments, and any improvements and equivalent changes made on the basis of the specific embodiments of the present invention are within the scope of protection of the claims of the present invention.

[0031] Embodiment 1 An anti-wind reinforcement system for a flat single-axis photovoltaic support system

[0032] An anti-wind reinforcement system for a flat single-axis photovoltaic support system is provided based on the flat single-axis photovoltaic support system. As Figure 1 shown, the flat single-axis photovoltaic support system includes a photovoltaic panel 1, a transverse support beam 3, a column 4, a main shaft girder 2, a rotating mechanism and an automatic control mechanism. A plurality of transverse support beams 3 and a main shaft girder 2 perpendicular to the transverse support beam 3 are provided on the bottom surface of the photovoltaic panel 1. A plurality of columns 4 arranged in rows are rotatably connected to the main shaft girder 2 through the rotating mechanism, and the automatic control mechanism is connected to the rotating mechanism to control the rotation of the photovoltaic panel 1. The installation position of the anti-wind reinforcement system of the flat single-axis photovoltaic support system is as Figure 3 shown, and its structure is as Figure 2 shown, including a connecting beam 5, a wire rope 6 and a wire rope length adjusting device 7. The connecting beam 5 is arranged on both sides of the main shaft girder 2 at the bottom surface of the photovoltaic panel 1, between adjacent two transverse support beams 3, and is fixedly connected to the adjacent two transverse support beams 3; a wire rope length adjusting device 7 for adjusting the length of the wire rope 6 is installed on each column 4. After the wire rope 6 is wound around the length adjusting device, its first end is fixedly connected to the connecting beam 5 on one side of the main shaft girder 2 through a hanging ring and fixed by a wire rope clip, and its second end is fixedly connected to the connecting beam 5 on the other side of the main shaft girder 2 through a hanging ring and fixed by a wire rope clip; the wire rope length adjusting device 7 is an elastic self-locking shaft pulley, and its structure is as Figures 4 - 9As shown in the figure, the elastic self-locking shaft pulley includes a pulley 16. At the central position inside the pulley 16, there is a core shaft 8. Along the radial direction of the pulley 16 with respect to the core shaft 8, there are eight slide rails 12. The angle between adjacent two slide rails 12 is 45°. On each slide rail 12, there is a resilient shaft slider 11 adapted thereto. The steel wire rope 6 is wound around the outer surfaces of the eight resilient shaft sliders 11 away from the core shaft 8. The first end of the core shaft 8 sequentially passes through the valve hole of the clamp solenoid valve in the housing of the pulley 16, the column 4 and the limiting mechanism 14. The limiting mechanism 14 also includes a relay. The clamp solenoid valve is connected to the automatic control mechanism through the relay. An annular resistance-increasing groove 15 is provided on the core shaft 8. The position of the annular resistance-increasing groove 15 on the core shaft 8 corresponds to the clamping position of the clamp solenoid valve when the photovoltaic panel 1 is in a horizontal position. The second end of the core shaft 8 passes through the housing of the pulley 16 and is sleeved with a spring 13. One end of the spring 13 is fixedly arranged on the housing of the pulley 16, and the other end of the spring 13 is fixed to the second end of the core shaft 8. The second end of the core shaft 8 is also fixedly provided with an umbrella bone support frame 9. The umbrella bone support frame includes eight support frames 9. The first end of each support frame 9 is fixedly connected to its core shaft 8, and the second end of each support frame 9 is connected to its corresponding resilient shaft slider 11. On the first surface of the housing of the pulley 16, there are chutes 10 adapted to the eight support frames 9 for the eight support frames 9 of the umbrella bone support frame to slide. The second surface of the housing of the pulley 16 is fixed on the column 4.

[0033] The working principle of this embodiment is as follows: When the photovoltaic panel 1 is working, the automatic control system controls the photovoltaic panel 1 to rotate following the sun. The connecting beam 5 pulls the steel wire rope 6, and the apparent length of the steel wire rope 6 changes accordingly, thereby driving the resilient shaft sliders in the elastic self-locking shaft pulley to move along the slide rails 12, so that the steel wire rope 6 is always in a taut state. When the photovoltaic panel 1 is in the horizontal protection state, the apparent length of the steel wire rope 6 is the longest, the resilient shaft sliders are at the positions closest to the core shaft 8 in the slide rails 12, the second end of the core shaft 8 is the farthest from the first surface of the housing of the pulley 16, the spring 13 is the longest and in the state of the greatest tensile force, and the automatic control system controls the solenoid valve to cut off the power through the relay and clamps at the position of the annular resistance-increasing groove 15 of the core shaft 8. When the photovoltaic panel 1 is at the ±45° position, the apparent length of the steel wire rope 6 is the shortest, the resilient shaft sliders are at the positions farthest from the core shaft 8 in the slide rails 12, the second end of the core shaft 8 is the closest to the first surface of the housing of the pulley 16, and the spring 13 is the shortest and in a balanced state.

[0034] Embodiment 2 An anti-wind reinforcement system for a flat single-axis photovoltaic support system

[0035] The main technical solutions of this embodiment are basically the same as those of Embodiment 1. For the features not explained in this embodiment, the explanations in Embodiment 1 are adopted and will not be elaborated here. The difference between this embodiment and Embodiment 1 is that the steel wire rope length adjusting device 7 is two automatic rebound wheels, namely the first automatic rebound wheel and the second automatic rebound wheel. The structure of the automatic rebound wheel is asFigure 10 As shown, the first automatic rebound wheel and the second automatic rebound wheel are respectively installed on both sides of the column 4. A central shaft 17 is provided at the center position inside the first automatic rebound wheel and the second automatic rebound wheel. A clockwork spring 18 is provided on the central shaft 17. One end of the clockwork spring 18 is fixedly arranged on the neutral axis. Two steel wire ropes 6 are respectively fixedly connected to the other ends of the clockwork springs 18 in the first automatic rebound wheel and the second automatic rebound wheel. The two steel wire ropes 6 are respectively wound around the outer circles of the clockwork springs 13 in the first automatic rebound wheel and the second automatic rebound wheel. The first end of one steel wire rope 6 passes through the steel wire rope 6 outlet of the first automatic rebound wheel, and is fixedly connected to the connecting beam 5 on one side of the main shaft main beam 2 through a sling and fixed by a wire clip. The second end of the other steel wire rope 6 passes through the steel wire rope 6 outlet of the second automatic rebound wheel, and is fixedly connected to the connecting beam 5 on the other side of the main shaft main beam 2 through a sling and fixed by a wire clip. The limiting mechanism 14 includes a clamp 19 and an electric bolt 20. Clamps 19 are provided at the steel wire rope 6 outlets of the first automatic rebound wheel and the second automatic rebound wheel. An electric bolt 20 is provided outside the clamp 19. The electric bolt 20 is connected to the automatic control system.

[0036] Working principle of this embodiment: When the photovoltaic panel 1 works, the automatic control system controls the photovoltaic panel 1 to rotate following the sun. The connecting beam 5 pulls the steel wire rope 6, and the length of the steel wire rope 6 changes accordingly, thereby driving the steel wire ropes 6 in the first automatic rebound wheel and the second automatic rebound wheel to stretch or retract. When the photovoltaic panel 1 is in the horizontal protection state, the stretching lengths of the steel wire ropes 6 in the first automatic rebound wheel and the second automatic rebound wheel are the same. The automatic control system controls the electric bolt 20 to be powered off and extended, pressing the clamp 19 to lock the length of the steel wire rope 6. When the photovoltaic panel 1 is at the ±45° position, the stretching length of the steel wire rope 6 in the first automatic rebound wheel is the shortest or the longest, and the stretching length of the steel wire rope 6 in the second automatic rebound wheel is the longest or the shortest.

[0037] Embodiment 3 An anti-wind reinforcement system for a flat single-axis photovoltaic support system

[0038] The main technical solutions of this embodiment are basically the same as those of Embodiment 1. For the features not explained in this embodiment, the explanations in Embodiment 1 are adopted and will not be elaborated here. The difference between this embodiment and Embodiment 1 is that the adjusting device is a sliding wheel shaft device, and its structure is as Figures 11 - 12 ​As shown in the figure, the sliding wheel shaft device includes a pulley 16. A steel wire rope 6 is wound around the pulley 16. Reinforcing plates 22 are provided on both the first surface and the second surface of the pulley 16 housing. A positioning bolt 24 is fixedly provided between the reinforcing plates 22 on the first surface and the second surface. One end of a spring 13 is connected to the positioning bolt 24, and the other end of the spring 13 is fixedly connected to a fixed frame 21. The fixed frame 21 is fixedly installed on one side of a column 4. A vertical sliding rail 23 adapted to the positioning bolt 24 is provided inside the fixed frame 21. A limiting mechanism 14 is fixedly installed on the other side of the column 4. The limiting mechanism 14 includes an electric bolt 20. The electric bolt 20 is connected to an automatic control system. A locking hole 25 adapted to the electric bolt 20 is provided on the pulley 16.

[0039] Working principle of this embodiment: When the photovoltaic panel 1 works, the automatic control system controls the photovoltaic panel 1 to rotate following the sun. The connecting beam 5 pulls the steel wire rope 6, thereby driving the positioning bolt 24 to move up and down in the sliding rail 23. When the photovoltaic panel 1 is in the horizontal protection state, the positioning bolt 24 moves up and down in the sliding rail 23, making the steel wire rope 6 taut. The automatic control system controls the electric bolt 20 to be powered off and extended, passing through the locking hole 25 on the column 4 and the pulley 16 to lock the position of the pulley 16. When the photovoltaic panel 1 is at the ±45° position, the positioning bolt 24 moves up and down in the sliding rail 23, tautening the steel wire rope 6.

Claims

1. An anti-wind reinforcement system for a flat single-axis photovoltaic support system, which is set based on the flat single-axis photovoltaic support system. The flat single-axis photovoltaic support system includes a photovoltaic panel, a transverse support beam, a column, a main shaft main beam, a rotating mechanism, and an automatic control mechanism. A plurality of transverse support beams and a main shaft main beam perpendicular to the transverse support beam are arranged on the bottom surface of the photovoltaic panel. A plurality of columns arranged in rows are rotatably connected to the main shaft main beam through the rotating mechanism. The automatic control mechanism is connected to the rotating mechanism to control the rotation of the photovoltaic panel. It is characterized in that, The wind resistance reinforcement system of the flat single-axis photovoltaic support system includes a connecting beam, a steel wire rope, and a steel wire rope length adjusting device. The connecting beam is arranged on both sides of the main shaft girder at the bottom surface of the photovoltaic panel, between two adjacent transverse support beams, and is fixedly connected to the two adjacent transverse support beams; a steel wire rope length adjusting device for adjusting the length of the steel wire rope is installed on each column. After the steel wire rope is wound around the length adjusting device, its first end is fixedly connected to the connecting beam on one side of the main shaft girder, and its second end is fixedly connected to the connecting beam on the other side of the main shaft girder; a limit mechanism linked with the automatic control mechanism is installed on the steel wire rope length adjusting device. After the length adjustment of the steel wire rope is completed, the automatic control mechanism controls the limit mechanism to lock the steel wire rope length adjusting device; The steel wire rope length adjusting device is an elastic self-locking shaft pulley. The elastic self-locking shaft pulley includes a pulley. A core shaft is arranged at the center position inside the pulley. Eight slide rails are arranged along the radius direction of the pulley with the core shaft. The angle between two adjacent slide rails is 45°. A resilient shaft slider adapted to each slide rail is installed on each slide rail. The steel wire rope is wound on the outer surfaces of the eight resilient shaft sliders away from the core shaft. The first end of the core shaft sequentially passes through the pulley housing, the column, and the valve hole of the clamp solenoid valve in the limit mechanism. A relay is also included in the limit mechanism. The clamp solenoid valve is connected to the automatic control mechanism through the relay. An annular resistance increasing groove is arranged on the core shaft. The position of the annular resistance increasing groove on the core shaft corresponds to the clamping position of the clamp solenoid valve when the photovoltaic panel is in a horizontal position; the second end of the core shaft passes through the pulley housing and is sleeved with a spring. One end of the spring is fixedly arranged on the pulley housing, and the other end of the spring is fixed to the second end of the core shaft. An umbrella bone support frame is also fixedly arranged at the second end of the core shaft. The umbrella bone support frame includes eight support frames. The first end of each support frame is fixedly connected to its core shaft, and the second end of each support frame is connected to its corresponding resilient shaft slider. A chute adapted to the eight support frames is provided on the first surface of the pulley housing for the eight support frames of the umbrella bone support frame to slide. The second surface of the pulley housing is fixed to the column; Alternatively, the steel wire rope length adjusting device is two automatic return pulleys, namely a first automatic return pulley and a second automatic return pulley. The first automatic return pulley and the second automatic return pulley are respectively installed on both sides of the column. Central shafts are arranged at the center positions inside the first automatic return pulley and the second automatic return pulley. A clockwork spring is arranged on the central shaft. One end of the clockwork spring is fixedly arranged on the neutral axis. Two steel wire ropes are respectively fixedly connected to the other ends of the clockwork springs in the first automatic return pulley and the second automatic return pulley. The two steel wire ropes are respectively wound on the outer rings of the clockwork springs in the first automatic return pulley and the second automatic return pulley. The first end of one steel wire rope passes through the steel wire rope outlet of the first automatic return pulley and is fixedly connected to the connecting beam on one side of the main shaft girder. The second end of the other steel wire rope passes through the steel wire rope outlet of the second automatic return pulley and is fixedly connected to the connecting beam on the other side of the main shaft girder; the limit mechanism includes a clamp and an electric bolt. Clamps are arranged at the steel wire rope outlets of the first automatic return pulley and the second automatic return pulley. Electric bolts are arranged outside the clamps. The electric bolts are connected to the automatic control system; Alternatively, the wire rope length adjusting device is a sliding wheel shaft device. The sliding wheel shaft device includes a pulley around which the wire rope is wound. Reinforcing plates are provided on both the first surface and the second surface of the pulley housing. A positioning bolt is fixedly provided between the reinforcing plates on the first surface and the second surface. One end of a spring is connected to the positioning bolt, and the other end of the spring is fixedly connected to a fixed frame. The fixed frame is fixedly installed on one side of the column. A vertical sliding rail adapted to the positioning bolt is provided inside the fixed frame. A limiting mechanism is fixedly installed on the other side of the column. The limiting mechanism includes an electric bolt which is connected to an automatic control system. A locking hole adapted to the electric bolt is provided on the pulley.

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