A photovoltaic module support structure with automatic tilt angle adjustment

Abstract

The application discloses a photovoltaic module support structure with automatic inclination angle adjustment, and relates to the technical field of photovoltaic power generation support structures.The support structure comprises a stand column and a flange plate arranged at the top of the stand column, the top of the flange plate is provided with a lower shell, an upper shell, a synchronous swing assembly, a profile cam assembly and two groups of locking assemblies; the bottom of the lower shell is fixed to the top end of the stand column through the flange plate, and the upper shell is buckled on the upper end of the lower shell to form a sealed cavity; through the cooperative matching of the synchronous swing assembly, the profile cam assembly, a radial floating assembly and the locking assemblies, the problems that the electric control active protection is prone to failure under extreme working conditions, the structural strength is redundant, the construction cost is high, and the characteristics of the additional damping device are difficult to adapt to the change of working conditions are effectively improved; in the profile cam assembly, a progressive positive stiffness section realizes progressive damping suppression of wind vibration, a sudden jump section triggers instantaneous unloading protection, and a locking section provides a stable holding position, thereby creating a dual working mode of daily vibration reduction and extreme risk avoidance for the photovoltaic module.

Description

Technical Field

[0001] This invention relates to the field of photovoltaic power generation support structure technology, specifically a photovoltaic module support structure with automatic tilt angle adjustment. Background Technology

[0002] The photovoltaic module support structure with automatic tilt angle adjustment is the core load-bearing unit for realizing dynamic adjustment of the module attitude angle in the photovoltaic power generation system. It is a key device that determines the system's power generation revenue, structural safety redundancy, and full life cycle operation and maintenance costs.

[0003] Existing photovoltaic module support structures with automatic tilt angle adjustment mostly employ seasonally adjustable tilt angle, single-axis tracking, and dual-axis tracking technologies. Their wind vibration suppression and extreme wind and snow overload protection primarily rely on three technical means: structural strength redundancy, electronically controlled active leveling for disaster avoidance, and additional damping buffer devices. Structural strength redundancy relies on increasing the cross-section and wall thickness of the main beam to resist peak loads; electronically controlled active leveling relies on a series link between wind speed sensors, controllers, and servo drives to bring the modules to a safe position; and additional damping buffering relies on hydraulic or spring dampers to absorb some vibration energy. However, under conditions of sudden wind direction changes, gradual snow accumulation, and power supply fluctuations at remote sites, the above technical approaches have the following limitations: while structural strength redundancy can improve load-bearing capacity... While there are limitations, this leads to increased steel consumption and construction costs, and the cross-sectional dimensions are constrained by the torque limitations of the tracking drive. The electronically controlled active leveling has a time chain from sensor triggering, controller calculation to servo execution, involving signal transmission and action response. Under conditions of instantaneous strong gusts, the component attitude adjustment is prone to lag behind the wind load climbing speed. In outdoor environments with alternating high and low temperatures, dust, and electromagnetic interference, wind speed sensors, controllers, and drive circuits are prone to performance degradation and occasional failures. The active leveling function is unavailable during power outages at remote sites. The damping characteristics of additional damping buffer devices are mostly factory-preset fixed values, making it difficult to adapt to the vibration frequency drift caused by wind speed changes. Furthermore, the aging of seals in hydraulic dampers during long-term service can easily lead to damping fluid leakage and damping attenuation. Summary of the Invention

[0004] The purpose of this invention is to provide a photovoltaic module support structure with automatic tilt angle adjustment, in order to solve the problems mentioned in the background art, such as insufficient reliability and lag in response of electronically controlled active leveling protection under extreme conditions, high cost of structural strength redundancy and difficulty in adapting general overload protectors to long-term maintenance-free outdoor conditions, and significant differences in the positive and negative load characteristics of the support structure, making it difficult for existing protection schemes to match differentiated triggering requirements.

[0005] To achieve the above objectives, the present invention provides the following technical solution: The present invention provides a photovoltaic module support structure with automatic tilt angle adjustment, including a column and a flange disposed on the top thereof; The top of the flange is provided with a lower housing, an upper housing, a synchronous swing assembly, a contour cam assembly, and two sets of locking assemblies; The bottom of the lower housing is fixed to the top of the column by a flange, and the upper housing is fastened to the upper end of the lower housing to form a sealed cavity; The synchronous swing assembly includes a main shaft and an arm body. The main shaft horizontally passes through both sides of the lower housing and is rotatable. The arm body is fixed to the middle section of the main shaft and swings synchronously with the main shaft. The arm body is equipped with a radial floating component at its end; The radial floating assembly includes rollers; The profile cam assembly is fixed to the bottom of the inner wall of the lower housing. The top profile of the profile cam assembly is continuously transitioned by a progressive positive stiffness section, two jump sections and two locking sections. The roller is always pressed against the top profile of the profile cam assembly under the spring force of the radial floating assembly; Each set of locking components is provided with a corresponding locking section, and the locking components are used to achieve mechanical locking after the roller enters the corresponding locking section.

[0006] Preferably, the synchronous swing assembly further includes a main beam connecting flange and two deep groove ball bearings. One end of the main shaft is provided with a main beam connecting flange for connecting the photovoltaic load-bearing main beam. Both ends of the main shaft are supported on the side wall of the lower housing by two deep groove ball bearings. Each deep groove ball bearing is provided with an oil seal on its outer side, and each oil seal is used to achieve dynamic sealing. The outer wall of the main shaft is symmetrically provided with two positioning shoulders, and the two positioning shoulders are used for axial positioning of the main body of the arm.

[0007] Preferably, the radial floating assembly further includes two lugs, two guide rods, two compression springs, two guide sleeves, and a pin. The main body of the arm has symmetrically provided guide holes at its ends. Each guide sleeve is fitted into the corresponding guide hole port. The front end of each guide rod is fixedly connected to the corresponding lug. The body of each guide rod is slidably engaged with the corresponding guide sleeve. Each compression spring is located in the corresponding guide hole and provides an outward elastic thrust to the lug. The roller is hinged between the two lugs by a pin.

[0008] Preferably, each guide rod has an external thread section at its rear end, and an adjusting nut is screwed onto each external thread section. The front end of each compression spring abuts against the bottom end of the guide hole, and the rear end of each compression spring abuts against the end face of the corresponding adjusting nut. By rotating the corresponding adjusting nut, the initial compression amount of the corresponding compression spring can be changed to adjust the trigger threshold.

[0009] Preferably, the contour cam assembly includes a cam disk body, and the bottom of the lower housing is provided with a mounting groove that matches the shape of the cam disk body. The cam disk body is embedded in the mounting groove, and the bottom surface, front side, rear side, left side and right side of the cam disk body are respectively fitted and fixed to the corresponding inner wall of the mounting groove.

[0010] Preferably, the top contour of the cam disc body is symmetrically distributed along the swing direction of the arm body, with a progressive positive stiffness section in the middle, and two jump sections and two locking sections on both sides. The progressive positive stiffness section is a smooth curve with a gradually changing radius of curvature, each jump section is a cliff-like contour with a sudden change in curvature, and each locking section is a concave groove-shaped contour.

[0011] Preferably, each locking assembly includes a locking tenon, a return spring, and a stop. Each locking segment has a tenon hole on its side wall. The locking tenon is slidably installed in the corresponding tenon hole. The tail of the locking tenon is provided with a spring positioning post. The return spring is fitted on the spring positioning post. One end of the return spring abuts against the limiting boss, and the other end abuts against the bottom of the tenon hole. The stop is provided at the opening of the tenon hole. The locking tenon is provided with a limiting boss that cooperates with the stop to limit the maximum extension.

[0012] Preferably, the locking tenon includes a body guide section and a head locking claw; the upper side of the head locking claw is provided with a guide slope for pressing the locking tenon back into the tenon hole when the roller enters the locking section, the front end of the head locking claw is provided with a locking straight surface for preventing the roller from rebounding, and the lower side of the head locking claw is provided with an unlocking slope for the roller to roll out in the opposite direction and press the locking tenon back when resetting.

[0013] Preferably, the two jump segments and the two locking segments are asymmetrically designed, with the vertex of the jump segment on the positive snow load side being higher than the vertex of the jump segment on the negative wind load side, and the depth of the locking segment on the positive snow load side being greater than the depth of the locking segment on the negative wind load side, so that the positive trigger threshold is greater than the negative trigger threshold.

[0014] Compared with the prior art, the beneficial effects of the present invention are: In this invention, the coordinated operation of the synchronous swing assembly, the contour cam assembly, the radial floating assembly, and the locking assembly effectively improves the problems of easy failure of electronic active protection under extreme conditions, high construction costs due to structural strength redundancy, and difficulty in adapting the fixed characteristics of additional damping devices to changes in operating conditions. In the contour cam assembly, the progressive positive stiffness section achieves progressive damping suppression of wind vibration, the sudden jump section triggers instantaneous unloading protection, and the locking section provides a stable holding position, enabling photovoltaic modules to achieve a dual working mode of daily vibration reduction and extreme risk avoidance. In the radial floating assembly, the compression spring and the guide rod provide continuously variable elastic restoring force. The adjusting nut enables on-site adjustment of the trigger threshold, the guide sleeve ensures the coaxiality and stability of the floating motion, and in the locking assembly, the guide ramp enables automatic retraction when the roller rolls in, the locking straight surface forms a reliable mechanical lock to prevent rebound, the return spring ensures the locking state under normal conditions and automatic reset after unlocking, the fully sealed shell isolates outdoor sand and rain erosion, and the five-sided embedded cam disc body fixation improves load-bearing stability and positioning accuracy, significantly reduces the risk of structural failure under extreme weather conditions, extends the maintenance interval of the bracket throughout its entire life cycle, and improves the power generation stability and investment returns of the photovoltaic system. Attached Figure Description

[0015] Figure 1 This is a perspective view of the main structure in this invention; Figure 2 This is a three-dimensional cross-sectional view of the structure in this invention; Figure 3 This is a schematic diagram showing the installation positions of the synchronous swing assembly, the contour cam assembly, and the locking assembly in this invention. Figure 4 This is a schematic diagram of the installation position structure of the synchronous swing component in this invention; Figure 5 This is a schematic diagram of the installation position structure of the radial floating component in this invention; Figure 6 This is a schematic diagram of the mounting position structure of the contour cam assembly in this invention; Figure 7 This is a schematic diagram of the top outline of the cam disk body in this invention; Figure 8 This is a schematic diagram of the installation position structure of the locking component in this invention; Figure 9 This is a schematic diagram of the installation position of the locking tenon in this invention.

[0016] In the diagram: 100, column; 200, flange; 300, lower housing; 400, upper housing; 500, synchronous swing assembly; 501, main shaft; 502, main beam connecting flange; 503, oil seal; 504, deep groove ball bearing; 505, positioning shoulder; 506, boom body; 507, guide hole; 508, radial floating assembly; 5081, lug; 5082, guide rod; 5083, external thread section; 5084, adjusting nut; 5085, compression spring; 5 086, Guide sleeve; 5087, Pin; 5088, Roller; 600, Contour cam assembly; 601, Cam disc body; 602, Progressive positive stiffness section; 603, Jump section; 604, Locking section; 605, Loop hole; 700, Locking assembly; 701, Locking latch; 7011, Guide slope; 7012, Locking straight surface; 7013, Body guide section; 702, Limiting boss; 703, Stop; 704, Spring positioning pin; 705, Return spring. Detailed Implementation

[0017] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0018] like Figures 1-3 As shown, this embodiment provides a photovoltaic module support structure with automatic tilt angle adjustment, including a column 100 and a flange 200 on its top, as well as a lower housing 300, an upper housing 400, a synchronous swing assembly 500, a contour cam assembly 600, and two sets of locking assemblies 700. The column 100 is made of Q235B seamless steel pipe and is vertically embedded in a concrete foundation. The flange 200 is welded to its top. The flange 200 has four bolt mounting holes and two positioning pin holes evenly distributed along its circumference for mounting to the bottom of the lower housing 300. The lower housing 300 is a box-shaped cast steel component with an opening at the top, integrally cast from QT450-10 ductile iron. A rectangular mounting flange is integrally cast at the bottom, which is fastened to the flange 200 with hexagonal bolts. The locating pins ensure installation accuracy. The upper housing 400 is a rectangular cover plate structure, also cast from ductile iron, which is snapped onto the upper opening of the lower housing 300. A nitrile rubber sealing strip is embedded between the mating surfaces of the two, and IP65 static sealing is achieved by tightening with eight circumferentially arranged bolts, together forming the internal sealing cavity.

[0019] like Figure 4As shown, the synchronous swing assembly 500 includes a main shaft 501, a main beam connecting flange 502, two deep groove ball bearings 504, two positioning shoulders 505, and a main body 506. The main shaft 501 is a stepped round shaft made of 40Cr alloy steel with heat treatment. It runs horizontally through the left and right side walls of the lower housing 300 in the east-west direction. Both ends are supported in the bearing seat holes of the housing side walls by the deep groove ball bearings 504. Each deep groove ball bearing 504 has a double-lip skeleton oil seal 503 on its outer side. The outer ring of the oil seal 503 is interference-fitted with the bearing seat hole of the housing, and the inner lip clamps the outer surface of the main shaft 501 to achieve a rotary dynamic seal. The left end of the main shaft 501 is integral. The main beam connecting flange 502 is provided. Six bolt holes and a positioning stop are evenly opened on the end face of the main beam connecting flange 502 for bolt connection with the end flange of the photovoltaic load-bearing main beam. The right end of the main shaft 501 is the optical axis support end, which has a slightly smaller diameter and only serves as a support. Two positioning shoulders 505 are symmetrically provided in the middle section of the main shaft 501. A flat keyway is milled on the shaft section between the two positioning shoulders 505. The shaft hole at the root of the arm body 506 is circumferentially fixed to the main shaft 501 by a type A flat key, and axial positioning is achieved by the positioning shoulders 505 on both sides in conjunction with the positioning sleeve, so as to ensure that the arm body 506 swings synchronously with the main shaft 501 without axial movement.

[0020] like Figures 4-5As shown, the main body 506 of the arm is made of 42CrMo alloy steel and is a fan-shaped thick arm structure. Two guide holes 507 are symmetrically opened radially at its outer end. Each guide hole 507 is equipped with a radial floating assembly 508. The radial floating assembly 508 includes a lug 5081, a guide rod 5082, an adjusting nut 5084, a compression spring 5085, a guide sleeve 5086, a pin 5087, and a roller 5088. The guide sleeve 5086 is a cylindrical liner made of tin bronze. The sleeve, with an outer flange, is press-fitted into the outer port of the guide hole 507. Its inner hole and the front section of the guide rod 5082 are fitted with an H7 / f6 clearance fit to ensure smooth sliding. The guide rod 5082 is made of 45 steel with a surface hardened and chrome-plated finish. Its front end is welded to the back of the lug 5081. The rear section of the guide rod 5082 has an external thread section 5083. A fine-pitch adjusting nut 5084 is screwed onto the external thread section 5083. The nut has a set screw hole on its side for locking. A compression spring 50... 85 is made of 60Si2Mn spring steel and is a cylindrical helical compression spring. It is sleeved on the rear section of the guide rod 5082 and accommodated in the inner cavity of the guide hole 507. The front end of the compression spring 5085 abuts against the bottom end face of the guide hole 507, and the rear end of the compression spring 5085 abuts against the front end face of the adjusting nut 5084. Two lugs 5081 are arranged symmetrically on the left and right sides. Each lug 5081 has a coaxial pin hole. The pin 5087 passes through the pin holes of the two lugs 5081. The end shaft is axially limited by an elastic retaining ring. The roller 5088 is a cylindrical roller with a needle roller bearing installed inside. It is hinged to the middle section of the pin 5087 through the needle roller bearing and can rotate freely around the pin 5087. The outer surface of the roller 5088 is precision ground and contacts the cam profile. On the outer end face of the arm body 506, a rectangular clearance groove is opened at the position corresponding to the roller 5088. This groove provides clearance space when the roller 5088 floats inward, preventing the outer circle of the roller 5088 from rigidly colliding with the end face of the arm body.

[0021] like Figures 6-7As shown, the contour cam assembly 600 is located at the bottom of the inner wall of the lower housing 300, including a cam disk body 601. A rectangular mounting groove matching the external dimensions of the cam disk body 601 is cast on the bottom inner wall of the lower housing 300. The cam disk body 601 is integrally machined from GCr15 bearing steel and has a cuboid block structure. It is fitted into the mounting groove from above. The bottom, front, rear, left, and right sides of the cam disk body 601 respectively fit against the corresponding inner wall surfaces of the mounting groove, using an H7 / h6 clearance fit to achieve five-sided positioning constraint. After the upper housing 400 is fastened and installed, a pressure plate integrally provided on its inner side presses the upper end face of the cam disk body 601 from the top, preventing the cam disk from slipping during operation. During the process, the cam disc body 601 moves upward due to impact. The top of the cam disc body 601 is the working profile surface, which extends continuously along the swing direction of the arm body 506. It is composed of a progressive positive stiffness section 602 in the middle, two jump sections 603 on both sides, and two locking sections 604 that are continuously and smoothly transitioned. The progressive positive stiffness section 602 is a gentle concave curve with a gradually changing radius of curvature. It is the lowest in the middle and gradually rises towards both ends, corresponding to the swing angle range of normal operation. Each jump section 603 is a cliff-like profile with a sudden change in curvature. The slope is gentler near the middle and steeper near the outside. The apex is the trigger critical point. Each locking section 604 is a concave arc-shaped groove. The bottom of the groove is the lowest point of the entire profile, which is used to accommodate the roller 5088 and form a stable protective position.

[0022] like Figures 8-9As shown, two sets of locking components 700 are respectively set for two locking sections 604. Each set includes a locking tenon 701, a return spring 705, and a stop block 703. The cam disc body 601 has a tenon hole 605 transversely opened on the inner side wall of each locking section 604. The tenon hole 605 has a stepped hole structure, with a smaller outer diameter and a larger inner diameter. The locking tenon 701 is made of 40Cr alloy steel and the head is hardened. It is slidably installed in the tenon hole 605 and includes a body guide section 7013 and a head locking claw. The body guide section 7013 is a smooth cylindrical section that slides with the outer hole wall of the tenon hole 605 to ensure that the locking tenon 701 extends and retracts along the hole axis without deflection. The head locking claw extends out of the locking section 604. Within the slot space, a guide slope 7011 is machined on the upper side, a vertical locking surface 7012 is machined on the front end, and an unlocking slope is machined on the lower side. The tail of the locking tenon 701 is provided with a limiting boss 702, which is an annular shoulder with a suddenly increased diameter. A thin cylindrical spring positioning post 704 extends integrally from the rear end face of the limiting boss 702. The return spring 705 is fitted onto the spring positioning post 704, with its front end abutting against the rear end face of the limiting boss 702 and its rear end abutting against the bottom end face of the tenon hole 605. The stop block 703 is an elastic retaining ring for the hole, which is fitted into the retaining ring groove on the inner wall of the outer port of the tenon hole 605 and cooperates with the front end face of the limiting boss 702 to limit the maximum extension of the locking tenon 701 and prevent the locking tenon 701 from being completely pushed out of the hole by the return spring 705.

[0023] like Figures 5-6 As shown, under normal operating conditions, the compression spring 5085 is in a pre-compressed state. The adjusting nut 5084 pushes the guide rod 5082 outwards, which in turn drives the lug 5081 and roller 5088 radially outwards, ensuring that the outer surface of the roller 5088 is always pressed against the top contour of the cam disc body 601. When the photovoltaic module experiences slight pitching and swaying due to changes in natural wind speed, the arm body 506 drives the roller 5088 to roll back and forth within the progressive positive stiffness range 602. As the sway angle gradually increases, the roller 5088 is gradually lifted by the contour surface, and the compression of the compression spring 5085 increases synchronously, providing progressively enhanced elastic restoring force, creating a damping effect against wind vibration and reducing the vibration amplitude of the module.

[0024] When encountering extreme weather or external loads exceeding the design threshold, roller 5088 is pushed to gradually approach the apex of the jump section 603. Once past the apex, the profile height rapidly decreases, entering the negative stiffness zone. At this point, compression spring 5085 instantly releases its elastic potential energy, pushing guide rod 5082 and lug 5081 to quickly extend outwards. Roller 5088 rapidly rolls along the steep slope of jump section 603 into the slot of locking section 604. During the process of roller 5088 rolling into the slot... First, the roller 5088 contacts the guide slope 7011 on the upper side of the locking tenon 701. The thrust of the roller 5088 is decomposed into a lateral component along the slope, pressing the locking tenon 701 back into the tenon hole 605. After the roller 5088 has completely passed the head locking claw, the elastic force of the return spring 705 will push the locking tenon 701 outward again. The locking straight surface 7012 blocks the return path of the roller 5088, forming a mechanical lock to prevent the roller 5088 from rebounding and falling out under load fluctuations.

[0025] After the protection is triggered, the roller 5088 on the positive snow load side rolls into the corresponding locking section 604, and the photovoltaic module swings down with the main beam to a near-vertical angle. The snow automatically slides off the module surface to relieve the load. On the opposite wind load side, the roller 5088 rolls into the corresponding locking section 604, and the photovoltaic module swings up to a near-horizontal angle. The windward area is greatly reduced, and the wind resistance load is significantly reduced.

[0026] During the reset operation, the original tilt adjustment push rod of the photovoltaic bracket applies force in the opposite direction, pushing the main body 506 of the arm to swing in the opposite direction. The roller 5088 rolls back from the bottom of the slot of the locking section 604. After contacting the unlocking slope on the underside of the locking tenon 701, it presses the locking tenon 701 back into the hole. The roller 5088 rolls out of the slot smoothly and gradually climbs back to the progressive positive stiffness section 602 along the gentle slope of the jump section 603. The entire bracket returns to normal working condition.

[0027] In this embodiment, the two spring sections 603 and the two locking sections 604 adopt an asymmetrical and differentiated design. The apex height of the spring section 603 on the positive snow load side is higher than that on the negative wind load side, corresponding to a larger spring compression and a higher trigger threshold. The depth of the locking section 604 on the positive snow load side is also greater than that on the negative wind load side, providing a larger protective swing angle stroke. Conversely, the negative wind load side has a lower apex, a smaller stroke, and a lower trigger threshold, enabling rapid triggering of the protection action when the wind speed reaches the set value. The different parameter settings on both sides are adapted to the different load characteristics and protection requirements of snow load and wind load, respectively.

[0028] During assembly, first, install the synchronous swing assembly 500 into the inner cavity of the lower housing 300. Then, install the deep groove ball bearings 504 and oil seals 503 into both ends of the main shaft 501 in sequence. After adjusting them into place, seal the outer bearing end caps. Next, insert the cam disc body 601 into the mounting groove at the bottom from above. Adjust the circumferential position so that the rollers 5088 are aligned with the middle position of the progressive positive stiffness section 602. Then, install the two sets of locking assemblies 700 into the corresponding latch holes 605. Manually press the locking latches 701 to confirm that the extension and retraction are smooth and without jamming. Finally, fasten the upper housing 400 and tighten the circumferential connecting bolts in a diagonal sequence.

[0029] During on-site installation and commissioning, the initial compression of the compression spring 5085 can be changed by rotating the adjusting nut 5084, thereby adjusting the trigger threshold. When the adjusting nut 5084 is screwed in towards the bottom of the hole, the pre-compression of the compression spring 5085 increases, the preload of the roller 5088 increases, and the trigger threshold increases accordingly. When it is screwed out towards the opening of the hole, the pre-compression decreases, and the trigger threshold decreases accordingly. After adjustment, the set screw on the side of the adjusting nut 5084 is tightened to lock it in place, preventing the threshold from drifting due to loosening caused by vibration during long-term operation.

[0030] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A photovoltaic module support structure with automatic tilt angle adjustment, comprising a column (100) and a flange (200) disposed on its top, characterized in that: The flange (200) is provided with a lower housing (300), an upper housing (400), a synchronous swing assembly (500), a contour cam assembly (600), and two sets of locking assemblies (700) on its top. The bottom of the lower housing (300) is fixed to the top of the column (100) by a flange (200), and the upper housing (400) is fastened to the upper end of the lower housing (300) to form a sealed cavity; The synchronous swing assembly (500) includes a main shaft (501) and an arm body (506). The main shaft (501) passes horizontally through both sides of the lower housing (300) and is rotatable. The arm body (506) is fixed to the middle section of the main shaft (501) and swings synchronously with the main shaft (501). The arm body (506) is provided with a radial floating component (508) at its end; The radial floating assembly (508) includes rollers (5088); The profile cam assembly (600) is fixed to the bottom of the inner wall of the lower housing (300). The top profile of the profile cam assembly (600) is formed by a continuous transition of a progressive positive stiffness section (602), two jump sections (603) and two locking sections (604). The roller (5088) is always pressed against the top profile of the profile cam assembly (600) under the spring force of the radial floating assembly (508); Each locking component (700) is provided with a corresponding locking segment (604), and the locking component (700) is used to achieve mechanical locking after the roller (5088) enters the corresponding locking segment (604).

2. The photovoltaic module support structure with automatic tilt angle adjustment according to claim 1, characterized in that: The synchronous swing assembly (500) also includes a main beam connecting flange (502) and two deep groove ball bearings (504). One end of the main shaft (501) is provided with a main beam connecting flange (502) for connecting the photovoltaic load-bearing main beam. Both ends of the main shaft (501) are supported on the side wall of the lower housing (300) by two deep groove ball bearings (504). Each deep groove ball bearing (504) is provided with an oil seal (503) on its outer side, and each oil seal (503) is used to achieve dynamic sealing. The outer wall of the main shaft (501) is symmetrically provided with two positioning shoulders (505), and the two positioning shoulders (505) are used for axial positioning of the arm body (506).

3. The photovoltaic module support structure with automatic tilt angle adjustment according to claim 1, characterized in that: The radial floating assembly (508) also includes two ear seats (5081), two guide rods (5082), two compression springs (5085), two guide sleeves (5086), and a pin (5087). The arm body (506) has symmetrically opened guide holes (507) at its ends. Each guide sleeve (5086) is fitted into the port of the corresponding guide hole (507). The front end of each guide rod (5082) is fixedly connected to the corresponding ear seat (5081). The rod body of each guide rod (5082) is slidably engaged with the corresponding guide sleeve (5086). Each compression spring (5085) is provided in the corresponding guide hole (507) and provides an outward elastic thrust to the ear seat (5081). The roller (5088) is hinged between the two ear seats (5081) through the pin (5087).

4. The photovoltaic module support structure with automatic tilt angle adjustment according to claim 3, characterized in that: Each guide rod (5082) has an external thread section (5083) at its rear end, and an adjusting nut (5084) is screwed onto each external thread section (5083). The front end of each compression spring (5085) abuts against the bottom end of the guide hole (507), and the rear end of each compression spring (5085) abuts against the end face of the corresponding adjusting nut (5084). By rotating the corresponding adjusting nut (5084), the initial compression amount of the corresponding compression spring (5085) can be changed to adjust the trigger threshold.

5. The photovoltaic module support structure with automatic tilt angle adjustment according to claim 1, characterized in that: The contour cam assembly (600) includes a cam disk body (601). The bottom of the lower housing (300) is provided with a mounting groove that matches the shape of the cam disk body (601). The cam disk body (601) is embedded in the mounting groove. The bottom surface, front side, rear side, left side and right side of the cam disk body (601) are respectively fitted and fixed to the corresponding inner wall of the mounting groove.

6. The photovoltaic module support structure with automatic tilt angle adjustment according to claim 5, characterized in that: The top contour of the cam disc body (601) is symmetrically distributed along the swing direction of the arm body (506). The middle part is a progressive positive stiffness section (602), and there are two jump sections (603) and two locking sections (604) on both sides. The progressive positive stiffness section (602) is a smooth curve with a gradually changing radius of curvature. Each jump section (603) is a cliff-like contour with a sudden change in curvature. Each locking section (604) is a concave groove-shaped contour.

7. The photovoltaic module support structure with automatic tilt angle adjustment according to claim 1, characterized in that: Each locking assembly (700) includes a locking tenon (701), a return spring (705), and a stop (703). Each locking segment (604) has a tenon hole (605) on its side wall. The locking tenon (701) is slidably installed in the corresponding tenon hole (605). The tail of the locking tenon (701) is provided with a spring positioning post (704). The return spring (705) is fitted on the spring positioning post (704). One end of the return spring (705) abuts against the limiting boss (702), and the other end abuts against the bottom of the tenon hole (605). The stop (703) is provided at the opening of the tenon hole (605). The locking tenon (701) is provided with a limiting boss (702) that cooperates with the stop (703) to limit the maximum extension.

8. The photovoltaic module support structure with automatic tilt angle adjustment according to claim 7, characterized in that: The locking tenon (701) includes a body guide section (7013) and a head locking claw; the upper side of the head locking claw is provided with a guide slope (7011) for pressing the locking tenon (701) back into the tenon hole (605) when the roller (5088) enters the locking section (604); the front end of the head locking claw is provided with a locking straight surface (7012) for preventing the roller (5088) from rebounding; the lower side of the head locking claw is provided with an unlocking slope for the roller (5088) to roll out in the opposite direction and press the locking tenon (701) back when resetting.

9. The photovoltaic module support structure with automatic tilt angle adjustment according to claim 6, characterized in that: The two jump segments (603) and the two locking segments (604) are asymmetrically designed. The vertex of the jump segment (603) on the positive snow load side is higher than the vertex of the jump segment (603) on the negative wind load side. The depth of the locking segment (604) on the positive snow load side is greater than the depth of the locking segment (604) on the negative wind load side, so that the positive trigger threshold is greater than the negative trigger threshold.

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