Adjustable inclined support frame for photovoltaic panel in highway intercommunication area

Abstract

The utility model relates to an expressway intercommunication area photovoltaic panel adjustable inclined supporting frame which comprises a supporting rod, the bottom of the supporting rod is provided with a reinforcing assembly connected with the ground, the top of the supporting rod is provided with a supporting seat through a first rotating assembly, the first rotating assembly can drive the supporting seat to rotate, and the upper surface of the supporting seat is provided with a second rotating assembly. The output end of the second rotating assembly is fixedly connected with a rotating main beam, the second rotating assembly can drive the rotating main beam to rotate, a bracket beam is installed on the rotating main beam through at least two sets of first locking assemblies, and the bracket beam is perpendicular to the rotating main beam. And a photovoltaic panel main body is mounted between the adjacent bracket beams through a second locking assembly. The device has the beneficial effects of improving the power generation efficiency, enhancing the stability, being convenient to install and maintain and the like.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of photovoltaic power generation equipment, in particular to a tiltable support frame for photovoltaic panels in an expressway interchange area. BACKGROUND

[0002] With the vigorous promotion of clean energy, it has gradually become a trend to install photovoltaic panels in expressway interchange areas for photovoltaic power generation. However, the existing support frames for photovoltaic panels in expressway interchange areas have many problems. On the one hand, the structure of the traditional support frame is fixed and cannot effectively adjust the inclination angle and orientation of the photovoltaic panels according to seasonal changes, the change of the solar elevation angle and the azimuth angle, resulting in that the photovoltaic panels cannot fully receive sunlight and the power generation efficiency is low. On the other hand, the environment in the expressway interchange area is complex and the wind is strong, and the existing support frames have deficiencies in reinforcement and stability and are difficult to withstand strong winds and other bad weather, which easily leads to the tilting and collapse of the support frame, affecting the normal use of the photovoltaic panels and posing a safety hazard. In addition, the operation in the process of installing and dismounting the photovoltaic panels is complicated, which is not conducive to the later maintenance and repair and increases the labor and time costs. CONTENT OF THE INVENTION

[0003] The present application mainly aims at the above-mentioned problems existing in the prior art and provides a tiltable support frame for photovoltaic panels in an expressway interchange area, which can flexibly adjust the inclination angle and orientation of the photovoltaic panels, improve the power generation efficiency of the photovoltaic panels, enhance the stability and firmness of the support frame, adapt to the complex environment in the expressway interchange area, and simplify the process of installing and dismounting the photovoltaic panels, facilitating the later maintenance and repair.

[0004] The main purpose of the present application is achieved through the following scheme:

[0005] The tiltable support frame for photovoltaic panels in an expressway interchange area comprises a support rod, a reinforcing assembly connected with the ground is arranged at the bottom of the support rod, a support seat is installed at the top of the support rod through a first rotating assembly, the first rotating assembly can drive the support seat to rotate, a second rotating assembly is installed on the upper surface of the support seat, the output end of the second rotating assembly is fixedly connected with a rotating main beam, the second rotating assembly can drive the rotating main beam to rotate, a bracket beam is installed on the rotating main beam through a first locking assembly, the bracket beam is arranged perpendicularly to the rotating main beam, at least two groups of the first locking assemblies are arranged, and a photovoltaic panel body is installed between adjacent bracket beams through a second locking assembly.

[0006] As a preferred embodiment, the reinforcing assembly is made of reinforced concrete and comprises an upper steel mesh, a lower steel mesh and concrete poured around the periphery of the upper steel mesh and the lower steel mesh, the lower steel mesh is fixedly welded to the upper steel mesh, a plurality of reinforcing screws are welded to the upper part of the upper steel mesh, and the upper ends of the reinforcing screws protrude out of the upper surface of the concrete.

[0007] Preferably, the bottom of the support rod is provided with a connecting flange, which is fixedly connected to the reinforcing screw by a lock nut, and a reinforcing rib is provided between the upper surface of the connecting flange and the side wall of the support rod. A grounding flat iron is also connected to the connecting flange, and the bottom of the grounding flat iron is buried underground.

[0008] Preferably, the second rotating component uses a dual-axis motor, and each of the output ends on both sides is connected to a rotating main beam, which is a square tube beam.

[0009] Preferably, the bracket beam is a U-shaped beam with the opening facing downwards, and both ends of the bracket beam have rolled edge support portions extending inwards.

[0010] Preferably, the first locking assembly includes a support plate, locking bolts located on the front and rear sides of the rotating main beam, and fasteners connected to the top of the locking bolts. The support plate is located on the lower surface of the rotating main beam, the bracket beam is located on the upper surface of the rotating main beam, the bottom of the locking bolt is mounted on the support plate, and the top of the locking bolt is connected to the bracket beam by fasteners.

[0011] Preferably, a reinforcing rod is connected between the bottom of the support plate and the side wall of the bracket beam.

[0012] Preferably, the second locking assembly includes connectors, fasteners, and fastening bolts. Multiple connectors are provided along the length of the bracket beam. The bottom of the connector is connected to the bracket beam by fasteners, and the top of the connector is connected to the photovoltaic panel body.

[0013] Preferably, the connector includes a "Z"-shaped connecting plate and an inverted "V"-shaped connecting plate, with the "Z"-shaped connecting plate located on the outermost bracket beam and the inverted "V"-shaped connecting plate located on the middle bracket beam. The bottom end of the "Z"-shaped connecting plate is provided with a rolled edge limiting part, and the "Z"-shaped connecting plate is fastened to the opening of the bracket beam through the rolled edge limiting part, while the notch of the inverted "V"-shaped connecting plate is fastened to the opening of the bracket beam.

[0014] Preferably, the fastener includes a fastening block that is slidably connected inside the bracket beam. The upper and lower surfaces of the fastening block are provided with threaded holes, and the connector is connected to the bracket beam through fastening bolts on the threaded holes. The side wall of the fastening block is also provided with a limiting block, and the two sides of the limiting block are in contact with the inner wall of the bracket beam.

[0015] In summary, compared with the prior art, the present invention has the following beneficial technical effects:

[0016] (1) The utility model discloses a first rotating assembly and second rotating assembly can be set up according to different seasons, different time sun's altitude angle and azimuth, and the inclination angle and orientation of photovoltaic panel main part are adjusted flexibly, make photovoltaic panel can receive sunlight with better angle all the time, thereby improve power generation efficiency significantly;

[0017] (2) The utility model discloses a reinforcing assembly adopts reinforced concrete structure, through the cooperation of upper reinforcement net, lower reinforcement net and concrete, and the connecting mode of reinforcing screw and connecting flange, make support pole stably fixed on the ground, simultaneously, the reinforcing rib on the connecting flange further enhances the stability and wind resistance of support frame, effectively resists the strong wind of highway interchange area and other bad weather, and the grounding flat iron on the connecting flange improves equipment safety, guarantees the safe operation of photovoltaic panel main part;

[0018] (3) The utility model discloses a first locking assembly and second locking assembly are set up, make the installation and dismounting operation between bracket beam and rotating main beam, photovoltaic panel main part and bracket beam simple and quick, and the setting of fastening block and limiting block in fastener guarantees the stability that locking screw and connecting piece are connected with bracket beam, and simultaneously, it is convenient to maintain and overhaul photovoltaic panel main part in later period, and reduce manpower and time cost. BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1 It is a structural schematic view of the utility model;

[0020] Figure 2 It is the front view of the utility model;

[0021] Figure 3 It is the side view of the utility model;

[0022] Figure 4 It is the structural schematic view of reinforcing assembly in the utility model;

[0023] Figure 5 It is the connecting schematic view of rotating main beam and bracket beam in the utility model;

[0024] Figure 6 It is the installation schematic view of " Z " type connecting plate and bracket beam in the utility model;

[0025] Figure 7 It is the installation schematic view of inverted " several " type connecting plate and bracket beam in the utility model;

[0026] Figure 8 It is the installation schematic view of locking bolt and bracket beam in the utility model.

[0027] Fig. 1: support rod; 2: reinforcing assembly; 3: first rotating assembly; 4: support seat; 5: second rotating assembly; 6: rotating main beam; 7: first locking assembly; 8: bracket beam; 9: second locking assembly; 10: photovoltaic panel body; 11: upper steel mesh; 12: lower steel mesh; 13: reinforcing screw; 14: connecting flange; 15: locking nut; 16: reinforcing rib; 17: grounding flat iron; 18: edge curl support part; 19: support plate; 20: locking bolt; 21: fastener; 22: reinforcing rod; 23: connecting piece; 24: fastening bolt; 25: edge curl limiting part; 26: fastening block; 27: limiting block. DETAILED DESCRIPTION

[0028] The technical scheme of the utility model will be further specifically explained below by specific embodiments in combination with the drawings. It should be understood that the implementation of the utility model is not limited to the following embodiments, and any form of variation and / or change of the utility model will fall within the protection scope of the utility model.

[0029] Example 1:

[0030] As shown in Figure 1 , 2 , 3, the utility model discloses a technical scheme, the adjustable type tilt support frame of expressway interflow area photovoltaic panel, including the vertical support rod 1 of cylindrical structure, the bottom of support rod 1 is connected with the reinforcing assembly 2 that connects with ground, reinforcing assembly 2 adopts reinforced concrete structure, and the top of support rod 1 is installed with support seat 4 through first rotating assembly 3, first rotating assembly 3 can drive support seat 4 to rotate, first rotating assembly 3 adopts drive motor, is fixedly installed on the top of support rod 1, and the output end of drive motor is fixedly connected with the lower surface middle part of support seat 4, the upper surface of support seat 4 is fixedly installed with second rotating assembly 5 through bolt, and the output end of second rotating assembly 5 is fixedly connected with rotating main beam 6, and second rotating assembly 5 can drive rotating main beam 6 to rotate, second rotating assembly 5 adopts double-shaft motor in this embodiment, and the output end of both sides is fixedly connected with a rotating main beam 6, and rotating main beam 6 adopts square tube beam.

[0031] As shown in Figure 5 , every rotating main beam 6 is installed with bracket beam 8 through first locking assembly 7, and bracket beam 8 is vertically arranged with rotating main beam 6, and first locking assembly 7 is provided with at least two groups, and every rotating main beam 6 is provided with three first locking assemblies 7 in this embodiment, i.e. every rotating main beam 6 is installed with three longitudinal bracket beams 8, and photovoltaic panel body 10 is installed on the bracket beam 8 between adjacent bracket beams 8 through multiple second locking assemblies 9.

[0032] In actual operation, the inclination angle and azimuth angle of the photovoltaic panel can be changed by adjusting the angles of the first rotating assembly 3 and the second rotating assembly 5 according to the illumination condition and seasonal change, so that the power generation efficiency of the photovoltaic panel is improved.

[0033] Embodiment 2

[0034] As shown in Figure 1 , 4 , the utility model discloses another technical scheme, and the adjustable inclined support frame for photovoltaic panel in the interchange of highway is different from that in embodiment 1 in that the reinforcing assembly 2 comprises upper steel mesh 11, lower steel mesh 12 and concrete poured around the upper steel mesh 11 and the lower steel mesh 12, the upper steel mesh 11 and the lower steel mesh 12 are both in the cuboid structure, the upper surface of the upper steel mesh 11 is smaller than that of the lower steel mesh 12, the height of the upper steel mesh 11 is greater than that of the lower steel mesh 12, the top of the lower steel mesh 12 is welded and fixed with the bottom of the upper steel mesh 11, and a plurality of reinforcing screws 13 are uniformly welded on the upper part of the upper steel mesh 11 along the axis of the support rod 1, and the upper end of the reinforcing screw 13 extends out of the upper surface of the concrete.

[0035] Specifically, the bottom of the support rod 1 is welded with a connecting flange 14, the connecting flange 14 is fixedly connected with the reinforcing screw 13 through a locking nut 15, a plurality of reinforcing ribs 16 are uniformly welded between the upper surface of the connecting flange 14 and the side wall of the support rod 1 along the axis thereof, so that the support rod 1 is stably fixed on the ground, the connecting flange 14 is further fixedly connected with a grounding flat iron 17 through a bolt, the bottom of the grounding flat iron 17 is buried underground, the grounding flat iron 17 can effectively reduce the leakage current phenomenon, avoid electric shock accidents caused by leakage, help guide the current generated by lightning to flow to the ground safely, protect the photovoltaic assembly and related electrical equipment from damage caused by lightning, and further help stabilize the electrical performance of the photovoltaic system and reduce problems caused by voltage fluctuation or electromagnetic interference.

[0036] Embodiment 3

[0037] As shown in Figure 1 , 5 , the utility model discloses another technical scheme, and the adjustable inclined support frame for photovoltaic panel in the interchange of highway is different from that in embodiment 1 in that the bracket beam 8 adopts a "U" type beam with the opening facing downward, and the two end openings of the bracket beam 8 are both integrally provided with a curled edge support part 18 inwardly extended.

[0038] Specifically, as shown in Figure 8As shown, the first locking assembly 7 includes a support plate 19 in L-shaped structure, locking bolts 20 located on the front and rear sides of the rotating main beam 6, and fasteners 21 connected to the top of the locking bolts 20. The support plate 19 is located on the lower surface of the rotating main beam 6, the bracket beam 8 is located on the upper surface of the rotating main beam 6, the bottom of the locking bolt 20 is mounted on the support plate 19, and the top of the locking bolt 20 extends into the inside of the bracket beam 8 and is fixedly connected between the bracket beam 8 through the fasteners 21.

[0039] Specifically, the bottom of the support plate 19 and the front and rear end side walls of the bracket beam 8 are fixedly connected by a reinforcing rod 22, which further improves the installation stability of the bracket beam 8.

[0040] Specifically, the second locking assembly 9 includes a connecting piece 23, a fastener 21 and a fastening bolt 24. The connecting piece 23 is provided in plurality along the length direction of the bracket beam 8, and the number of the connecting piece 23 is determined according to the installation number and size of the photovoltaic panel body 10. The bottom of the connecting piece 23 is connected with the bracket beam 8 through the fastener 21 and the fastening bolt 24, and the top of the connecting piece 23 is fixedly connected with the frame of the photovoltaic panel body 10 through bolts. The connecting piece 23 can stably support the photovoltaic panel body 10.

[0041] Specifically, as shown in Figure 6 , 7 The connecting piece 23 includes a "Z"-shaped connecting plate and an inverted "L"-shaped connecting plate. The "Z"-shaped connecting plate is located on the bracket beam 8 at the two sides of the edge, and the inverted "L"-shaped connecting plate is located on the bracket beam 8 in the middle. The bottom end of the "Z"-shaped connecting plate is integrally provided with a curled edge limiting part 25, and the "Z"-shaped connecting plate is buckled at the opening of the bracket beam 8 through the curled edge limiting part 25. The notch of the inverted "L"-shaped connecting plate is buckled at the opening of the bracket beam 8.

[0042] Specifically, the fastener 21 includes a fastening block 26 slidingly connected inside the bracket beam 8. Screw holes are provided on the upper and lower surfaces of the fastening block 26, and the connecting piece 23 is connected with the bracket beam 8 through the fastening bolt 24 on the screw hole. Limiting blocks 27 are symmetrically provided on the left and right side walls of the fastening block 26. The two sides of the limiting blocks 27 are in contact with the inner wall of the bracket beam 8. The limiting blocks 27 on the side walls of the fastening block 26 ensure the stable sliding of the fastener 21 inside the bracket beam 8, prevent loosening during installation and use, and ensure the reliability of the entire support frame structure.

[0043] The application should be equipped with a PLC controller, which is electrically connected with the first rotating assembly 3 and the second rotating assembly 5 and can control the operation thereof, the specific structure, principle and circuit connection mode of which are not within the protection scope of the application and can be deduced by the person skilled in the art through conventional means, which will not be described here again; in addition, by installing light sensors connected with the controller, the light intensity in different directions can be sensed in real time, in the application, a plurality of light sensors can be uniformly arranged around the photovoltaic panel main body 10, when the position of the sun changes and the light is irradiated on the photovoltaic panel at different angles, the light intensity received by each sensor is different, the sensor transmits the intensity signals to the controller, the controller analyzes and calculates to obtain the deviation of the approximate azimuth and altitude angle of the sun from the existing angle of the photovoltaic panel, for example, if the light intensity detected by the east sensor is obviously higher than that of other positions, it indicates that the sun is east at this time, and according to the intensity difference and the layout parameters of the sensor, the azimuth angle of the sun deviating from the south direction can be estimated; in combination with the light intensity distribution at different positions of the photovoltaic panel, the altitude angle of the sun can be calculated, and the controller sends instructions to the first rotating assembly 3 and the second rotating assembly 5 according to the data, drives the motor to operate, drives the support seat 4 and the rotating main beam 6 to rotate, and then adjusts the inclination angle and direction of the photovoltaic panel main body 10, so that it is closer to the direction perpendicular to the sunlight, improves the power generation efficiency, and the circuit connection of the light sensor and the controller, the signal transmission path and the algorithm are not within the protection scope of the application, and the person skilled in the art can deduce them according to conventional technical means or existing technology, which will not be described here again.

[0044] The adjustable inclined support frame for the photovoltaic panel in the expressway interchange area can be installed in a certain expressway interchange area.

[0045] First, the reinforcing assembly 2 is constructed, the lower steel mesh 12, the upper steel mesh 11 and the reinforcing screw rod 13 are welded and fixed according to the design requirements, then the concrete is poured around the reinforcing assembly 2, so that the concrete wraps the steel mesh to form a stable foundation structure, and the upper end of the reinforcing screw rod 13 extends out of the upper surface of the concrete.

[0046] Then, the connecting flange 14 at the bottom of the support rod 1 is placed on the reinforcing screw rod 13, the connecting flange 14 and the reinforcing screw rod 13 are fixedly connected through the locking nut 15, the reinforcing rib 16 is welded in advance between the upper surface of the connecting flange 14 and the side wall of the support rod 1 to enhance the stability of the connection, one end of the grounding flat iron 17 is connected to the connecting flange 14 through a bolt, and the other end is buried underground to achieve good grounding effect.

[0047] Then the first rotating assembly 3 is installed on the top of the support rod 1, the support base 4 is connected with the support rod 1 through the first rotating assembly 3, so that the support base 4 can rotate under the driving of the first rotating assembly, and the second rotating assembly 5 is installed on the upper surface of the support base 4, and the second rotating assembly 5 adopts a double-shaft motor in the embodiment, and one rotating main beam 6 is installed on the output end of each side of the double-shaft motor.

[0048] Secondly, the bracket beam 8 is installed on the rotating main beam 6 through the first locking assembly, and the specific operation is as follows: the support plate 19 is placed on the lower surface of the rotating main beam 6, the bracket beam 8 is placed on the upper surface of the rotating main beam 6, the bracket beam 8 is arranged perpendicularly to the rotating main beam 6, then the bottom of the locking bolt 20 located on the front and rear sides of the rotating main beam 6 is installed on the support plate 19, the top of the locking bolt 20 is connected with the bracket beam 8 through the screw hole of the fastener 21, and the reinforcing rod 22 is installed between the bottom of the support plate 19 and the side wall of the bracket beam 8, so that the stability of the connection is further enhanced.

[0049] Finally, the photovoltaic panel body 10 is installed between adjacent bracket beams 8 through the second locking assembly, for the bracket beam 8 at the edge, the hem limiting portion 25 of the “Z” shaped connecting plate is buckled at the opening of the bracket beam 8, and the “Z” shaped connecting plate is connected with the bracket beam 8 through the fastener 21 and the fastening bolt 24; for the bracket beam 8 in the middle, the notch of the inverted “Y” shaped connecting plate is buckled at the opening of the bracket beam 8, and the inverted “Y” shaped connecting plate is connected with the bracket beam 8 through the fastener 21 and the fastening bolt 24, finally, the photovoltaic panel body 10 is fixedly connected with the top of the connecting piece through the bolt, and the installation of the photovoltaic panel body 10 is completed.

[0050] In actual use, the controller controls the operation of the first rotating assembly 3 and the second rotating assembly 5, adjusts the angle of the support base 4 through the first rotating assembly 3 according to the altitude angle and the azimuth angle of the sun, drives the whole photovoltaic panel body 10 to rotate in the horizontal direction, adjusts the angle of the rotating main beam 6 through the second rotating assembly 5, and adjusts the inclination angle of the photovoltaic panel body 10, so that the photovoltaic panel body 10 can always receive sunlight at a better angle and improve the power generation efficiency.

[0051] The above are preferred embodiments of the application, and do not limit the protection scope of the application, so that: any equivalent changes made according to the structure, shape and principle of the application should be covered within the protection scope of the application.

Claims

1. An adjustable tilting support frame for photovoltaic panels in highway interchange areas, comprising a support rod (1), characterized in that: The bottom of the support rod (1) is provided with a reinforcement component (2) connected to the ground, and the top of the support rod (1) is provided with a support base (4) through a first rotating component (3). The first rotating component (3) can drive the support base (4) to rotate. The upper surface of the support base (4) is provided with a second rotating component (5). The output end of the second rotating component (5) is fixedly connected to a rotating main beam (6), and the second rotating component (5) can drive the rotating main beam (6) to rotate. A bracket beam (8) is provided on the rotating main beam (6) through a first locking component (7). The bracket beam (8) is set perpendicular to the rotating main beam (6). The first locking component (7) is provided with at least two sets, and a photovoltaic panel body (10) is installed between adjacent bracket beams (8) through a second locking component (9).

2. The adjustable tilting support frame for photovoltaic panels in highway interchanges according to claim 1, characterized in that: The reinforcement component (2) is made of reinforced concrete, including an upper steel mesh (11), a lower steel mesh (12) and concrete poured around the upper steel mesh (11) and the lower steel mesh (12). The lower steel mesh (12) is welded and fixed to the upper steel mesh (11), and multiple reinforcing screws (13) are welded to the upper part of the upper steel mesh (11). The upper end of the reinforcing screws (13) extends out of the upper surface of the concrete.

3. The adjustable tilting support frame for photovoltaic panels in highway interchanges according to claim 2, characterized in that: The bottom of the support rod (1) is provided with a connecting flange (14), which is fixedly connected to the reinforcing screw (13) by a locking nut (15). A reinforcing rib (16) is provided between the upper surface of the connecting flange (14) and the side wall of the support rod (1). A grounding flat iron (17) is also connected to the connecting flange (14), and the bottom of the grounding flat iron (17) is buried underground.

4. The adjustable tilting support frame for photovoltaic panels in highway interchanges according to claim 1, characterized in that: The second rotating component (5) uses a dual-axis motor, and both output ends on both sides are connected to a rotating main beam (6), which is a square tube beam.

5. The adjustable tilting support frame for photovoltaic panels in highway interchanges according to claim 4, characterized in that: The bracket beam (8) is a U-shaped beam with the opening facing downwards, and both ends of the bracket beam (8) are provided with rolled edge support parts (18) extending inwards.

6. The adjustable tilting support frame for photovoltaic panels in highway interchanges according to claim 5, characterized in that: The first locking assembly (7) includes a support plate (19), locking bolts (20) located on the front and rear sides of the rotating main beam (6), and fasteners (21) connected to the top of the locking bolts (20). The support plate (19) is located on the lower surface of the rotating main beam (6), and the bracket beam (8) is located on the upper surface of the rotating main beam (6). The bottom of the locking bolts (20) is installed on the support plate (19), and the top of the locking bolts (20) is connected to the bracket beam (8) through the fasteners (21).

7. The adjustable tilting support frame for photovoltaic panels in highway interchanges according to claim 6, characterized in that: A reinforcing rod (22) is connected between the bottom of the support plate (19) and the side wall of the bracket beam (8).

8. The adjustable tilting support frame for photovoltaic panels in highway interchanges according to claim 7, characterized in that: The second locking assembly (9) includes a connector (23), a fastener (21) and a fastening bolt (24). The connector (23) is provided in multiple ways along the length of the bracket beam (8). The bottom of the connector (23) is connected to the bracket beam (8) through the fastener (21), and the top of the connector (23) is connected to the photovoltaic panel body (10).

9. The adjustable tilting support frame for photovoltaic panels in highway interchanges according to claim 8, characterized in that: The connector (23) includes a "Z"-shaped connector plate and an inverted "V"-shaped connector plate. The "Z"-shaped connector plate is located on the outermost bracket beam (8), and the inverted "V"-shaped connector plate is located on the middle bracket beam (8). The bottom end of the "Z"-shaped connector plate is provided with a rolled edge limiting part (25), and the "Z"-shaped connector plate is fastened to the opening of the bracket beam (8) through the rolled edge limiting part (25). The notch of the inverted "V"-shaped connector plate is fastened to the opening of the bracket beam (8).

10. The adjustable tilting support frame for photovoltaic panels in highway interchanges according to claim 9, characterized in that: The fastener (21) includes a fastening block (26) that is slidably connected inside the bracket beam (8). The upper and lower surfaces of the fastening block (26) are provided with threaded holes, and the connector (23) is connected to the bracket beam (8) through the fastening bolts (24) on the threaded holes. The side wall of the fastening block (26) is also provided with a limiting block (27), and the two sides of the limiting block (27) are in contact with the inner wall of the bracket beam (8).

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