Device for testing natural vibration frequency of photovoltaic module

Abstract

The invention discloses a photovoltaic module natural vibration frequency testing device, and belongs to the technical field of photovoltaic power generation, the photovoltaic module natural vibration frequency testing device comprises a box body and a testing frame at the bottom of the box body, and a mechanical arm at the top of the box body hoists a photovoltaic module and falls on the testing frame; a moving mechanism and a testing part are arranged on the testing frame, the position for supporting the photovoltaic module is adjusted through the moving mechanism to simulate a flat single-axis photovoltaic support and a flexible photovoltaic support, and the natural vibration frequency of the photovoltaic module is tested through the testing part; an air inlet and an air outlet are formed in the side wall of the box body. The mechanical arm lifts the photovoltaic module to vertically fall on the test frame under the action of inertia force, a flat single-axis photovoltaic support and a flexible photovoltaic support are simulated through the moving mechanism, and the natural vibration frequency of the photovoltaic module is tested through the test component. The pneumatic damping and the natural vibration frequency of the photovoltaic module in the two states are tested by controlling whether the box body is vacuumized or not. According to the invention, the natural vibration characteristics of the photovoltaic module under different constraint forms can be tested, the mechanical degree is high, and the working efficiency is greatly improved.

Description

Technical Field

[0001] The present invention belongs to the technical field of photovoltaic power generation, and in particular relates to a device for testing the self-oscillation frequency of a photovoltaic module. Background Art

[0002] As a clean energy source, photovoltaic power generation plays a vital role in the global energy transition. Compared to traditional fossil fuels, photovoltaic power generation, due to its sustainability, pollution-free nature, and decreasing cost, has become a crucial tool for addressing climate change and achieving carbon neutrality. The long-term stability of photovoltaic systems depends not only on the performance of photovoltaic modules but also on their support structures. In recent years, the aerodynamic instability of photovoltaic supports under wind loads has garnered widespread attention, particularly with regard to the vibration characteristics of photovoltaic modules.

[0003] Because photovoltaic power plants are often exposed to complex external environments, dynamic factors such as wind loads and earthquakes can cause vibrations in photovoltaic modules and mounting brackets. When the vibration frequency approaches the module's natural frequency, resonance can occur, threatening system stability. Therefore, testing the natural frequency and damping ratio of photovoltaic modules is a critical step in ensuring the safe operation and extending the service life of photovoltaic systems.

[0004] Currently, existing technologies typically perform vibration testing on fixed photovoltaic mounting structures, making it difficult to quickly adapt to different types of mounting structures. Test equipment is often only suitable for specific mounting types (such as fixed mounting or flat single-axis mounting). Testing other mounting types requires reconfiguring the equipment or replacing the test platform, increasing time and costs.

[0005] At the same time, existing techniques for testing the natural frequency and damping ratio of photovoltaic modules suffer from complex and inefficient testing processes, often relying on external excitation devices such as vibration tables and vibrators. These devices are not only complex to install but also require extensive debugging and setup, consuming significant time and effort, and increasing the complexity of experimental operations. Furthermore, traditional testing methods often require extensive manpower and technical support, resulting in low test efficiency and failing to meet the rapid testing requirements of large-scale photovoltaic system deployments.

[0006] Furthermore, in traditional testing, existing test equipment cannot eliminate air interference, making it difficult to distinguish between the effects of aerodynamic damping and mechanical damping during testing. This makes it difficult for designers to accurately assess the impact of aerodynamic influences on the overall performance of PV panels, which in turn affects the structural optimization of the system. Summary of the Invention

[0007] In order to solve the above problems, the present invention provides a photovoltaic module self-oscillation frequency testing device.

[0008] To achieve the above object, the technical solutions adopted by the present invention are as follows:

[0009] A photovoltaic module self-frequency testing device comprises a sealed box capable of accommodating photovoltaic modules, a test frame for supporting photovoltaic modules provided at the bottom of the box, and a movable mechanical arm provided at the top of the box for hoisting photovoltaic modules and allowing them to freely fall onto the test frame; a moving mechanism and a test component are provided on the test frame, and the position of the photovoltaic module supported is adjusted by the moving mechanism to simulate a flat single-axis photovoltaic bracket and a flexible photovoltaic bracket, and the self-frequency of the photovoltaic module is tested by the test component; an air inlet and an air outlet are provided on the side walls of the box for introducing air into the box or evacuating the box.

[0010] Furthermore, the inner cavity of the box is a rectangular cavity, and the photovoltaic components, test racks, and photovoltaic components can be placed in sequence on the bottom of the box along its length; the top of the inner cavity of the box is provided with a guide rail along its length, and the robotic arm can move along the guide rail; the air inlet and air outlet are arranged on the side walls of the box at the left and right ends of the guide rail, and the air inlet and air outlet are only for air flow in and out of the box, and the air outlet is provided with an exhaust fan.

[0011] Furthermore, the robotic arm includes a movable slider, a telescopic rod, a driving mechanism and a plurality of mechanical claws. The movable slider is slidably engaged with the guide rail and can move along the guide rail. The upper end of the telescopic rod is connected to the movable slider and the lower end is connected to the mounting frame. The driving mechanism is arranged in the mounting frame, and the plurality of mechanical claws are circumferentially arranged around the mounting frame; the driving mechanism is used to drive the extension and retraction of the telescopic rod and the opening and closing of the mechanical claws.

[0012] Furthermore, the mechanical claw is connected to the mounting seat at the edge of the mounting frame through a connecting piece, and the connecting piece is a special-shaped rod with a bend in the middle. The upper part of the connecting piece is rotatably connected to the outer edge of the upper end of the mounting seat, and the middle part of the connecting piece is rotatably connected to the outer edge of the lower end of the mounting seat through the connecting rod; the upper end of the connecting piece is rotatably connected to the push-pull rod, and the other end of the push-pull rod passes through the mounting frame and is connected to the driving mechanism.

[0013] Furthermore, a magnet is provided in the slot of the mechanical claw for adsorbing the frame of the photovoltaic module.

[0014] Furthermore, the test frame is arranged on the base, and the photovoltaic module can be placed on two cylindrical rollers arranged in parallel and spaced apart. The two rollers are arranged in parallel on the base, and the distance between the two rollers is adjusted by a moving mechanism. The ends of the rollers are provided with a device for fixing the photovoltaic module for fixing the edge of the photovoltaic module; test components are provided on both sides of the two rollers.

[0015] Furthermore, the moving mechanism includes a driving motor, a screw and a support, the support is threadedly engaged with the screw, there are four screws, and the four screws are respectively arranged on the front and rear edges of the base, and the four screws are arranged in groups of two in front and back, and are respectively driven by the driving motor in the middle; two rollers are respectively arranged on two supports, and the front and rear ends of the supports are provided with self-locking mechanisms; the test component is arranged on a guide rod, and the guide rod is arranged parallel to the roller.

[0016] Furthermore, the test component is a laser displacement meter, the bottom of the shell of the laser displacement meter is threadedly engaged with the guide rod, and the guide rod is driven to rotate by a moving motor.

[0017] Furthermore, there are four self-locking mechanisms, which are symmetrically arranged in groups of two at both ends of the drum. The self-locking mechanism includes a support rod and a rotating pressure rod. A rotating motor and a lifting cylinder are provided inside the support rod. The rotating motor is used to drive the rotating pressure rod to rotate, and the lifting cylinder is used to drive the rotating pressure rod to rise and fall.

[0018] Furthermore, the surface of the roller is provided with an elongated arc-shaped buffer pad and an arc-shaped rotating shell. The roller is arranged on a support seat. Both ends of the support seat are mounted on supports. The roller is driven by a rotating motor. When the arc-shaped buffer pad rotates upward, it can contact the photovoltaic component to buffer the photovoltaic component; the rotating motor drives the roller to rotate, and the upper photovoltaic component can be moved to one side of the test frame through the arc-shaped rotating shell.

[0019] Compared with the prior art, the present invention has the following technical advances:

[0020] The present invention uses a mechanical arm on the top of the box to lift the photovoltaic module and move it to the top of the test frame and release it. The photovoltaic module falls freely onto the test frame, and the inertial force generated excites vibration, avoiding the need for additional excitation devices or the introduction of complex external interference in traditional tests; and uses test components for testing; uses a moving mechanism to adjust the position of the photovoltaic module on the test frame to simulate a flat single-axis photovoltaic bracket and a flexible photovoltaic bracket, thereby testing the natural frequency of the photovoltaic module. At the same time, by controlling whether the inside of the box is vacuum, the aerodynamic damping and natural frequency of the photovoltaic module in two states are tested, and then the aerodynamic stiffness and aerodynamic damping are calculated, providing a more realistic test environment, ensuring the accuracy and reliability of the test results, and thus providing important support for the design optimization of photovoltaic modules and the improvement of system stability. The present invention can test the natural vibration characteristics of photovoltaic modules under different constraint forms, is easy and fast to operate, has a high degree of mechanization, and greatly improves work efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The accompanying drawings are used to provide further understanding of the present invention and constitute a part of the specification. They are used to explain the present invention together with the embodiments of the present invention and do not constitute a limitation of the present invention.

[0022] In the attached figure:

[0023] Figure 1 A schematic structural diagram of a photovoltaic module self-oscillation frequency testing device provided by an embodiment of the present invention;

[0024] Figure 2 Schematic diagram of the structure of the robotic arm in an embodiment of the present invention;

[0025] Figure 3 Schematic diagram of the arrangement of the moving mechanism and the test components on the test stand in an embodiment of the present invention;

[0026] Figure 4 Schematic diagram of the structure of the moving mechanism in an embodiment of the present invention;

[0027] Figure 5 A schematic structural diagram of a test component in an embodiment of the present invention;

[0028] Figure 6 This is a structural diagram of the self-locking mechanism in an embodiment of the present invention;

[0029] Figure 7 Schematic diagram of the structure of the drum in an embodiment of the present invention;

[0030] In the picture:

[0031] 00-PV panel; 1-box; 2-test frame; 3-mechanical arm, 30-mounting frame, 31-moving slider, 32-telescopic rod, 33-driving mechanism, 34-mechanical claw, 35-connector, 36-mounting seat, 37-connecting rod, 38-push-pull rod, 39-magnet; 4-air inlet; 5-guide rail; 6-exhaust fan; 7-self-locking mechanism; 8-test component; 9-moving mechanism; 10-roller; 11-screw; 12-support; 13-baffle; 14-vertical plate; 15-mounting plate; 16-support rod; 17-rotating pressure rod; 18-driving motor; 19-guide rod; 20-bolt; 21-base; 22-bottom plate; 23-support seat; 24-arc-shaped rotating shell; 25-arc-shaped buffer pad. DETAILED DESCRIPTION

[0032] The following specific embodiments can be combined with each other, and the same or similar concepts or processes may not be described in detail in some embodiments. The embodiments of the present invention will be described below with reference to the accompanying drawings.

[0033] like Figure 1 、 Figure 2 and Figure 3As shown, a photovoltaic module natural frequency testing device includes a sealed box 1 capable of accommodating a photovoltaic module 00, a test frame 2 for supporting the photovoltaic module 00 is provided at the bottom of the box 1, and a movable mechanical arm 3 is provided on the top of the box 1 for hoisting the photovoltaic module 00 and allowing it to freely fall onto the test frame 2; a moving mechanism 9 and a test component 8 are provided on the test frame 2, and the position of the supporting photovoltaic module 00 is adjusted by the moving mechanism 9 to simulate a flat single-axis photovoltaic bracket and a flexible photovoltaic bracket, and the natural frequency of the photovoltaic module 00 is tested by the test component 8; an air inlet 4 and an air outlet are provided on the side wall of the box 1, which are used to introduce air into the box 1 or to vacuum the box, and can realize free switching between air-containing and air-free states, respectively testing the pneumatic damping and mechanical damping, and calculating the aerodynamic stiffness and aerodynamic damping of the photovoltaic module through comparative analysis. The device uses a mechanical gripper to grasp and release PV modules. As the modules fall freely, inertial forces induce vibrations, eliminating the need for additional excitation devices or complex external interference in traditional testing. The mobile mechanism simulates PV mounting configurations under various constraints. The test components accurately measure the natural frequency and damping ratio of PV modules, providing reliable mechanical performance data that helps optimize module design and improve stability and service life.

[0034] As a preferred structure, Figure 1 As shown, the inner cavity of the box 1 is a rectangular parallelepiped cavity. The bottom of the box 1 can sequentially place the photovoltaic module 00, the test rack 2, and the photovoltaic module 00 along its length. The top of the inner cavity of the box 1 is provided with a guide rail 5 along its length, and the robotic arm 3 can move along the guide rail 5. The air inlet 4 and air outlet are set on the side walls of the box 1 at the left and right ends of the guide rail 5. The air inlet 4 and air outlet only allow air to enter and exit the box 1. The air outlet is equipped with an exhaust fan 6. During specific production, check valves are installed at the air inlet 4 and air outlet to ensure unidirectional airflow. Figure 1 The box is shown with the top cover and one side panel removed.

[0035] In a specific embodiment of the present invention, Figure 1 、 2As shown, the robotic arm 3 includes a movable slider 31, a telescopic rod 32, a drive mechanism 33, and multiple mechanical claws 34. The movable slider 31 slides with the guide rail 5 and can move along the guide rail 5. The upper end of the telescopic rod 32 is connected to the movable slider 31, and the lower end is connected to the mounting frame 30. The drive mechanism 33 is disposed within the mounting frame 30, and multiple mechanical claws 34 are circumferentially arranged around the mounting frame 30. The drive mechanism 33 is used to drive the extension and retraction of the telescopic rod 32 and the opening and closing of the mechanical claws 34. During specific production, a micromotor is installed within the movable slider to drive the robotic arm along the guide rail. At the same time, the drive mechanism includes a lifting motor and an opening and closing component. The lifting motor is disposed in the middle of the mounting frame and at the bottom of the telescopic rod to drive the free extension and retraction of the telescopic rod 32. The opening and closing of the mechanical claws is driven by the opening and closing component. The robotic arm can move to the top of the photovoltaic module next to the test frame, lower the mechanical claws to grasp the photovoltaic module, and then rise and move to the top of the test frame. Subsequently, the mechanical claw releases the photovoltaic module, generating inertial force through the free fall of the photovoltaic module, thereby exciting vibration.

[0036] When designing specifically, Figure 2 As shown, the mechanical claw 34 is connected to the mounting seat 36 on the edge of the mounting frame 30 through a connecting member 35. The connecting member 35 is a special-shaped rod with a bend in the middle. The upper part of the connecting member 35 is rotatably connected to the outer edge of the upper end of the mounting seat 36, and the middle part of the connecting member 35 is rotatably connected to the outer edge of the lower end of the mounting seat 36 through a connecting rod 37. The upper end of the connecting member 35 is rotatably connected to a push-pull rod 38, and the other end of the push-pull rod 38 passes through the mounting frame 30 and is connected to the drive mechanism 33. Among them, the tensioning and closing components include a push-pull motor and a turntable. The middle part of the turntable is connected to the output end of the push-pull motor. The lower surface of the turntable is provided with an annular thread that cooperates with the side thread of the push-pull rod. The bottom surface of the inner cavity in the middle of the mounting frame is circumferentially provided with multiple radial grooves that slide with the push-pull rod (similar to a four-claw chuck structure). The turntable is driven forward and reverse by the push-pull motor, thereby driving the push-pull rods around to complete radial extension and retraction.

[0037] When making specific Figure 2 The illustrated embodiment features four mechanical claws and four mounting brackets. The mounting bracket utilizes a frame-like structure, comprising a central main frame and an auxiliary frame extending outboard. Four mounting brackets are spaced apart on the auxiliary frame, and four push-pull rods are radially arranged around the main frame. The telescopic rod comprises an outer sleeve and an inner sleeve. The upper end of the inner sleeve is connected to the movable slider, which is threadedly engaged with the outer sleeve. The lower end of the outer sleeve is fixedly connected to the top of the mounting bracket. The lower end of the inner sleeve passes through the mounting bracket and is connected to the output shaft of the lifting motor. The lifting motor drives the inner sleeve to rotate, thereby raising and lowering the inner sleeve relative to the outer sleeve. This structure enables the telescopic rod to be raised and lowered.

[0038] Further optimize the above scheme, such as Figure 2As shown, a magnet 39 is provided in the slot of the mechanical gripper 34 for adsorbing the frame of the photovoltaic module 00. The magnet can be an electromagnet. When powered, the mechanical gripper becomes magnetic, and the magnetic force can be used to firmly adsorb the frame of the photovoltaic module. As the movable slider moves on the guide rail, the photovoltaic module can be transported.

[0039] In a specific embodiment of the present invention, Figure 1 、 3 As shown in Figures 4 and 5, the test stand 2 is mounted on a base 21. The photovoltaic module 00 can be placed on two cylindrical rollers 10 arranged side by side and spaced apart. The two rollers 10 are arranged side by side on the base 21, and the distance between the two rollers 10 is adjusted by a moving mechanism 9. The ends of the rollers 10 are provided with a means for fixing the photovoltaic module 00 and the edges 7 of the photovoltaic module. Test components 8 are respectively provided on both sides of the two rollers 10, which can accurately measure the natural frequency and damping ratio. During installation, the base 21 is fixed to the bottom of the box 1 by bolts 20. The moving mechanism 9 includes a drive motor 18, a lead screw 11, and a support 12. The support 12 is threadedly engaged with the lead screw 11. There are four lead screws 11, which are respectively arranged on the front and rear edges of the base 21. The four lead screws 11 are arranged in groups of two in front and back and are respectively driven by the drive motor 18 in the middle. Two rollers 10 are respectively arranged on the two supports 12. The front and rear ends of the supports 12 are provided with self-locking mechanisms 7. The test component 8 is arranged on a guide rod 19, which is arranged parallel to the rollers 10. One end of the lead screw 11 is fixedly connected to the output shaft of the drive motor 18, and the other end is rotationally engaged with the baffle 13. The drive motor can drive the two rollers to move left and right on the two groups of lead screws in the front and rear. When the two rollers move to the sides of the base, they can simulate a flexible photovoltaic bracket. When they are located in the middle, they can simulate a flat single-axis photovoltaic bracket, thereby meeting the vibration characteristic test requirements of various structures.

[0040] The free fall motion of the photovoltaic module causes the photovoltaic module falling onto the drum to vibrate under the action of inertia. The displacement change of the free edges of the photovoltaic module on the left and right sides is measured by the test component, and the natural frequency and damping ratio of the photovoltaic module are calculated. Since the free fall height of the photovoltaic module is too high, it will cause cracks in the photovoltaic module after falling, and the free vibration of the photovoltaic module will be less obvious if the height is too low, it is necessary to limit the drop height of the photovoltaic module. The free fall height calculation formula of the photovoltaic module is as follows:

[0041] Given that the mass of the photovoltaic module is 29.5 kg, its physical parameters are 2.276 m long, 1.132 m wide, and 0.007 m thick, the calculated volume is 0.018 m. 3 In the static loading test, the photovoltaic module exhibited significant bending deformation when an initial uniformly distributed load of 600 Pa was applied under uniaxial constraint.

[0042] Assuming that the force exerted by the test frame on the photovoltaic module after the photovoltaic module undergoes free fall is the initial uniform load of 600Pa applied in the test, the free fall kinematic formula is v1 2 =v0 2 +2gh, where v1 is the final velocity, v0 is the initial velocity, g is the acceleration due to gravity, and h is the height of the PV module falling freely.

[0043] Given a mass of m = 29.5 kg, assuming contact time t = 0.1 s, and estimating the contact force between the PV module and the test frame, F = 600 × 2.276 × 1.132 = 1545.86 N, substitute Ft = mv1 into the free fall motion formula v1 according to the momentum theorem. 2 =2gh, the calculation formula for the falling height is The known initial velocity v0 = 0, contact time t = 0.1s, contact force F = 1545.86N, and gravitational acceleration g = 9.81m / s 2 , the falling height can be obtained

[0044] In summary, a suitable drop height of 1.4m for photovoltaic modules is appropriate.

[0045] When designing specifically, Figure 3 、 5 As shown, the test component 8 is a laser displacement meter. The bottom of the shell of the laser displacement meter is threadedly engaged with the guide rod 19. The guide rod 19 is driven to rotate by a mobile motor (not shown in the figure), thereby driving the laser displacement meter to move on the guide rod. During the specific production, the guide rod 19 is set on the base plate 22. The side of the base plate is provided with a vertical plate 14. The vertical plate 14 and the base plate 22 are an L-shaped integrated structure. The guide rod 19 is integrally formed with the vertical plate 14 and the base plate 22. A micro motor is provided at the bottom of the laser displacement meter to drive the laser displacement meter to move along the guide rod 19. The use of a laser displacement meter can accurately measure the displacement change of the photovoltaic module. The power spectrum calculation of the displacement attenuation curve can be used to obtain the natural frequency of the photovoltaic module. The free attenuation method is used to analyze and calculate the displacement attenuation curve to obtain the damping ratio of the photovoltaic module. At the same time, the mechanical damping is tested in a windless environment, and the mechanical damping and aerodynamic resistance are tested in a windy environment. The aerodynamic damping can be obtained by subtracting the two.

[0046] In a specific embodiment of the present invention, Figure 3 、 6As shown, there are four self-locking mechanisms 7, and they are symmetrically arranged in groups of two at both ends of the roller 10. The self-locking mechanism includes a support rod 16 and a rotating pressure rod 17. The support rod 16 is internally provided with a rotary motor and a lifting cylinder (not shown in the figure). The output end of the rotary motor is connected to the rotating pressure rod to drive the rotating pressure rod 17 to rotate; the rotary motor is connected to the movable end of the lifting cylinder, which drives the rotating pressure rod 17 to rise and fall through the lifting cylinder. Among them, the rotating pressure rod is a U-shaped rod with an opening downward, and the pressing end of the rotating pressure rod is provided with a rubber sleeve to prevent damage to the surface of the photovoltaic module when pressing it. At the same time, the support rod is connected to the base through the mounting plate 15. When the photovoltaic module falls onto the roller, the pressing end of the rotating pressure rod is rotated above the photovoltaic module and then lowered until it contacts the photovoltaic module to achieve the purpose of fixing the photovoltaic module. After the test is completed, the reverse operation can release the photovoltaic module by reversing the operation.

[0047] When making specific Figure 7 As shown, the surface of the drum 10 is provided with an elongated arc-shaped cushion 25 and an arc-shaped rotating shell 24. The drum 10 is mounted on a support base 23, the ends of which are mounted on a support 12. The drum 10 is driven by a rotary motor (not shown). When the arc-shaped cushion 25 rotates upward, it can contact the photovoltaic module 00, providing a buffer for the photovoltaic module. The rotating motor drives the drum 10 to rotate, and the arc-shaped rotating shell 24 can move the photovoltaic module 00 above to the side of the test stand 2.

[0048] To further optimize the above solution, the robotic arm, moving mechanism, test component and self-locking mechanism can be connected to the controller. The controller can control the actions of each component to realize automatic grasping of photovoltaic modules, automatic adjustment of roller position, automatic fixing and release of photovoltaic modules and automatic testing, thereby further improving the degree of automation of the equipment.

[0049] In summary, the present invention has the following advantages:

[0050] 1. Versatile testing capabilities, covering a wide range of application scenarios. This invention enables aerodynamic damping and aerodynamic stiffness testing of photovoltaic modules by freely switching between vacuum states within the entire device. This function provides comprehensive analytical data on the aerodynamic performance of photovoltaic modules, enabling designers to more accurately assess the vibration response of photovoltaic modules in different environments. The device's versatility expands the application scenarios of testing, thereby improving the stability and reliability of photovoltaic modules in various complex climate conditions.

[0051] 2. Automated operation simplifies the testing process. The device's robotic arm automatically grasps and releases PV panels, inducing vibration through inertial force without the need for additional excitation devices or complex external intervention, greatly simplifying the testing process. The PV panel is automatically moved by the robotic arm and dropped vertically onto the rollers of the test frame. The displacement is measured using a laser displacement meter, and the natural frequency and damping ratio are calculated. The entire process is highly automated, reducing manual errors while significantly improving testing efficiency and ensuring efficient and stable test results.

[0052] 3. Supports precise testing of various photovoltaic mount configurations. By adjusting the roller position through a screw, this device can flexibly support different photovoltaic mount configurations, including testing the natural frequency of flat single-axis and flexible photovoltaic mounts. This design provides a wider range of adaptability, enabling accurate vibration characteristic data for photovoltaic modules in various structural forms. This provides a reliable basis for the structural design and optimization of different photovoltaic systems, greatly expanding the device's application areas.

[0053] Finally, it should be noted that the above descriptions are merely preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art will be able to modify the technical solutions described in the aforementioned embodiments or substitute equivalents for some of the technical features. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the claims of the present invention.

Claims

1. A photovoltaic module self-oscillation frequency testing device, characterized by: It includes a closed box that can accommodate photovoltaic modules, a test frame for supporting photovoltaic modules at the bottom of the box, and a movable mechanical arm at the top of the box for lifting photovoltaic modules and allowing them to freely fall onto the test frame; the test frame is provided with a moving mechanism and a test component, and the position of the supporting photovoltaic modules is adjusted by the moving mechanism to simulate a flat single-axis photovoltaic bracket and a flexible photovoltaic bracket, and the natural frequency of the photovoltaic modules is tested by the test component; the side walls of the box are provided with air inlets and outlets for introducing air into the box or evacuating the box.

2. A photovoltaic module self-oscillation frequency testing device according to claim 1, characterized in that: The inner cavity of the box is a rectangular cavity, and the photovoltaic components, test racks, and photovoltaic components can be placed in sequence at the bottom of the box along its length; the top of the inner cavity of the box is provided with a guide rail along its length, and the robotic arm can move along the guide rail; the air inlet and air outlet are arranged on the side walls of the box at the left and right ends of the guide rail, and the air inlet and air outlet are only for air flow in and out of the box, and the air outlet is provided with an exhaust fan.

3. A photovoltaic module self-oscillation frequency testing device according to claim 2, characterized in that: The robotic arm includes a movable slider, a telescopic rod, a driving mechanism and a plurality of mechanical claws. The movable slider is slidably fitted with a guide rail and can move along the guide rail. The upper end of the telescopic rod is connected to the movable slider, and the lower end is connected to the mounting frame. The driving mechanism is arranged in the mounting frame, and the plurality of mechanical claws are circumferentially arranged around the mounting frame; the driving mechanism is used to drive the extension and retraction of the telescopic rod and the opening and closing of the mechanical claws.

4. A photovoltaic module self-oscillation frequency testing device according to claim 3, characterized in that: The mechanical claw is connected to the mounting seat at the edge of the mounting frame through a connecting piece. The connecting piece is a special-shaped rod with a bend in the middle. The upper part of the connecting piece is rotatably connected to the outer edge of the upper end of the mounting seat, and the middle part of the connecting piece is rotatably connected to the outer edge of the lower end of the mounting seat through the connecting rod; the upper end of the connecting piece is rotatably connected to the push-pull rod, and the other end of the push-pull rod passes through the mounting frame and is connected to the drive mechanism.

5. The photovoltaic module self-oscillation frequency testing device according to claim 3, characterized in that: A magnet is provided in the slot of the mechanical claw for adsorbing the frame of the photovoltaic module.

6. A photovoltaic module self-oscillation frequency testing device according to any one of claims 2 to 5, characterized in that: The test frame is arranged on the base, and the photovoltaic component can be placed on two cylindrical rollers arranged in parallel and spaced apart. The two rollers are arranged in parallel on the base, and the distance between the two rollers is adjusted by a moving mechanism. The ends of the rollers are provided with a device for fixing the photovoltaic component for fixing the edge of the photovoltaic component; test components are provided on both sides of the two rollers.

7. The photovoltaic module self-oscillation frequency testing device according to claim 6, characterized in that: The moving mechanism includes a driving motor, a screw and a support. The support is threaded with the screw. There are four screws, which are respectively arranged on the front and rear edges of the base. The four screws are arranged in groups of two in front and back and are respectively driven by the driving motor in the middle; two rollers are respectively arranged on two supports, and self-locking mechanisms are provided at the front and rear ends of the supports; the test component is arranged on a guide rod, and the guide rod is arranged parallel to the roller.

8. The photovoltaic module self-oscillation frequency testing device according to claim 7, characterized in that: The test component is a laser displacement meter. The bottom of the shell of the laser displacement meter is threadedly matched with a guide rod, and the guide rod is driven to rotate by a moving motor.

9. The photovoltaic module self-oscillation frequency testing device according to claim 6, characterized in that: There are four self-locking mechanisms, and they are symmetrically arranged in groups of two at both ends of the drum. The self-locking mechanism includes a support rod and a rotating pressure rod. A rotating motor and a lifting cylinder are provided inside the support rod. The rotating motor is used to drive the rotating pressure rod to rotate, and the lifting cylinder is used to drive the rotating pressure rod to rise and fall.

10. The photovoltaic module self-oscillation frequency testing device according to claim 6, characterized in that: The surface of the roller is provided with a long arc-shaped buffer pad and an arc-shaped rotating shell. The roller is arranged on a support seat. The two ends of the support seat are mounted on a support. The roller is driven by a rotating motor. When the arc-shaped buffer pad rotates to the upper side, it can contact the photovoltaic component to buffer the photovoltaic component; the rotating motor drives the roller to rotate, and the upper photovoltaic component can be moved to the side of the test frame through the arc-shaped rotating shell.

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