Photovoltaic electric field fault detection device

Abstract

The present invention provides a photovoltaic electric field fault detection device, which relates to the technical field of photovoltaic device testing. The fault detection device body comprises a connecting mechanism, a fitting component, an electric energy meter and a shielding component. A lifting tube is welded on the top of the electric energy meter, and a guide sleeve is integrally formed at one end of the connecting mechanism. The lifting tube passes upward from the inside of the guide sleeve, and the inner wall of the guide sleeve fits with the surface of the lifting tube. The other end of the connecting mechanism is welded to the fitting component as a whole. The fault detection device can obtain standard power generation data according to the installation angle, irradiation state and actual detection time of different photovoltaic panels through an installed detection board, so as to detect whether the photovoltaic panel to be tested has a fault by relying on the data, thereby improving the reliability of the detection data, being able to assist in judging the approximate position of the photovoltaic module with the fault, and then obtaining more detailed fault information, thereby improving the work efficiency of large-scale detection.

Description

Technical Field

[0001] The invention relates to the technical field of photovoltaic device testing, and in particular to a photovoltaic electric field fault detection device. Background Art

[0002] The main purpose of photovoltaic electric field fault detection is to ensure the safe and stable operation of photovoltaic power stations, improve power generation efficiency, extend equipment life, and reduce maintenance costs. Through regular detection and troubleshooting, potential problems can be discovered and solved in a timely manner, power outages and safety accidents caused by equipment failures can be avoided, and the reliability and sustainability of photovoltaic power stations can be ensured. Among them, the main solution for photovoltaic electric field fault detection is to directly connect the photovoltaic panel to be tested through an electric energy meter, and then measure its open circuit voltage, short circuit current, and power generation over a period of time and other parameters to evaluate component performance.

[0003] In the prior art, during the electrical performance testing of photovoltaic electric fields, the electric energy meter is directly installed at the bottom of the photovoltaic panel. After being connected for a period of time, the power generation is obtained to determine whether the photovoltaic electric field has a fault. However, the real-time power generation of photovoltaic panels installed in different time periods, different installation angles, and different locations are different. Therefore, it is very inaccurate to compare the data obtained by testing with the power generation parameters provided by the photovoltaic equipment when it leaves the factory, so it is easy to have detection errors. On the other hand, for large photovoltaic panels composed of multiple photovoltaic modules connected in series, conventional detection devices cannot further determine the specific photovoltaic module area where the fault occurs when a fault is found. Summary of the invention

[0004] In view of the shortcomings of the prior art, the purpose of the present invention is to provide a photovoltaic electric field fault detection device to solve the problems raised in the above-mentioned background technology. The present invention can obtain standard power generation data according to the installation angle, irradiation status and actual detection time of different photovoltaic panels, so as to rely on the data to detect whether there is a fault in the photovoltaic panel to be tested, thereby improving the reliability of the detection data, and can assist in determining the approximate location of the faulty photovoltaic module, and then obtain more detailed fault information, thereby improving the work efficiency of large-scale detection.

[0005] In order to achieve the above-mentioned purpose, the present invention is implemented through the following technical scheme: a photovoltaic electric field fault detection device, comprising a fault detection device body and a photovoltaic panel to be tested, the fault detection device body comprising a connecting mechanism, a fitting component, an electric energy meter and a shielding component, a lifting tube is welded on the top of the electric energy meter, one end of the connecting mechanism is integrally formed with a guide sleeve, the lifting tube passes upward from the inside of the guide sleeve, and the inner wall of the guide sleeve is fitted with the surface of the lifting tube, the other end of the connecting mechanism is welded to the fitting component as a whole, a detection plate is inserted on the top of the fitting component, a card block is screwed on the back of the detection plate, and the detection plate is embedded in the inside of the fitting component through the card block, shielding components are inserted at both ends of the fitting component, the shielding components cover the surface of the photovoltaic panel to be tested, the rear end of the electric energy meter is integrally formed with a back plate, the surface of the back plate is installed with a locking mechanism, and the top of the locking mechanism is against the bottom surface of the photovoltaic panel to be tested.

[0006] Furthermore, the bonding component includes a bonding plate and a groove, the groove is opened in the middle position of the bonding plate, and insertion channels are opened at both ends of the bonding plate. One end of the bonding plate is integrally formed with a lower hanging plate, and the top of the lower hanging plate is integrally formed with an end plate.

[0007] Furthermore, the lower hanging plate is pressed against the side of the photovoltaic panel to be tested, the bottom of the bonding plate is pressed against the surface of the photovoltaic panel to be tested, the shielding assembly passes through the inside of the insertion channel, a first rotating rod is inserted into the inner side of the end plate, and one end of the detection plate is welded to the surface of the first rotating rod.

[0008] Furthermore, the bottom of the detection plate is used to press on the surface of the bonding plate, and the width of the card block is the same as the width of the groove, and the side of the card block is attached with an anti-slip pad.

[0009] Furthermore, the shielding assembly includes side baffles, a front baffle and a shading film, the ends of the side baffles are movably connected to the ends of the front baffles via hinge shafts, the inner side of the front baffles is attached with a shading film, and the bottom of the side baffles is attached with a rubber pad.

[0010] Furthermore, a winding shaft is inserted into the inner wall of the groove, and the other end of the shading film is wound on the surface of the winding shaft. A gap is opened at the bottom of one side of the bonding plate, and the shading film passes out from the inside of the gap. The side baffle is pressed on the surface of the photovoltaic panel to be tested through the rubber pad at the bottom, and the bottom of the front baffle is directly pressed on the photovoltaic panel to be tested.

[0011] Furthermore, the connecting mechanism includes a support plate and a guide sleeve, a second rotating rod is inserted into the inner side of the end plate, one end of the support plate is welded to the surface of the second rotating rod, the other end of the support plate is integrally formed with a guide sleeve, and a support plate is integrally formed on the inner side of the guide sleeve.

[0012] Furthermore, a locking bolt is inserted into the side of the guide sleeve, a wire threading groove is opened on one side of the lifting tube, and a plurality of locking screw holes are opened on the other side of the lifting tube. The locking bolt passes through the side of the guide sleeve and is embedded in the locking screw hole, and the supporting plate is pressed on the surface of the wire threading groove.

[0013] Furthermore, the locking mechanism includes a support plate and an extrusion guide roller, a lifting rod is inserted into the surface of the support plate, an extrusion column is integrally formed at the top of the lifting rod, a screw is inserted at the bottom of the extrusion column, and an extrusion guide roller is sleeved on the surface of the extrusion column.

[0014] Furthermore, the screw rod passes through the surface of the support plate, and the end of the screw rod is movably connected to the bottom of the extrusion column through a bearing, and the extrusion guide roller is used to lean against the bottom position of the photovoltaic panel to be tested.

[0015] Beneficial effects of the present invention:

[0016] 1. The photovoltaic electric field fault detection device is equipped with a detection board on the top of the bonding component. By keeping the detection board completely parallel to the photovoltaic panel and synchronously receiving light to generate electricity, the standard power generation data can be obtained according to the installation angle, irradiation status and actual detection time of different photovoltaic panels, so as to rely on the data to detect whether there is a fault in the photovoltaic panel to be tested, thereby improving the reliability of the detection data.

[0017] 2. The photovoltaic electric field fault detection device is equipped with a shielding component on the inner side of the bonding component. Therefore, when there is an abnormality in the overall power generation of a large photovoltaic panel, different photovoltaic module areas can be shielded in turn by dividing the area, and the power generation can be re-detected. Ultimately, it can assist in determining the approximate location of the faulty photovoltaic module, and thus obtain more detailed fault information.

[0018] 3. The photovoltaic electric field fault detection device is pressed against the bottom of the photovoltaic panel to be tested by a locking mechanism at the rear end of the electric energy meter, and a pressing support effect is provided by an extrusion guide roller. When the detection of the photovoltaic panel or one of its areas is subsequently completed, there is no need to disassemble and assemble the entire detection device at any position. It can be directly pulled out along the inclined surface of the photovoltaic panel and then re-inserted for detection, which improves the work efficiency of large-scale detection. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1This is a structural diagram of a photovoltaic electric field fault detection device after installation according to the present invention;

[0020] Figure 2 This is a disassembled appearance diagram of a photovoltaic electric field fault detection device of the present invention;

[0021] Figure 3 This is a structural diagram of the shielding component of the present invention after it is unfolded;

[0022] Figure 4 It is a structural schematic diagram of the connecting mechanism part of the present invention;

[0023] Figure 5 is a cross-sectional view of a bonding component portion of the present invention;

[0024] Figure 6 It is a structural schematic diagram of the locking mechanism part of the present invention;

[0025] Figure 7 for Figure 1 A magnified image of area A;

[0026] In the figure: 1. Photovoltaic panel to be tested; 2. Electric energy meter; 3. Connecting mechanism; 4. Laminating component; 5. Locking mechanism; 6. Shielding component; 7. Detection plate; 8. Back plate; 9. Support plate; 10. Lifting rod; 11. Extrusion guide roller; 12. Screw rod; 13. Laminating plate; 14. Groove; 15. Insertion channel; 16. Side baffle; 17. Articulated shaft; 18. Front baffle; 19. Shading film; 20. Rubber pad; 21. Lower hanging plate; 22. End plate; 23. First rotating rod; 24. Second rotating rod; 25. Support plate; 26. Guide sleeve; 27. Locking bolt; 28. Block; 29. ​​Reeling shaft; 30. Gap; 31. Lifting tube; 32. Locking screw hole; 33. Threading groove; 34. Extrusion column; 35. Abutment plate. DETAILED DESCRIPTION

[0027] In order to make the technical means, creative features, objectives and effects achieved by the present invention easy to understand, the present invention is further explained below in conjunction with specific implementation methods.

[0028] See also Figures 1 to 7The present invention provides the following technical solutions: a photovoltaic electric field fault detection device, comprising a fault detection device body and a photovoltaic panel 1 to be tested, the fault detection device body comprising a connecting mechanism 3, a fitting component 4, an electric energy meter 2 and a shielding component 6, a lifting tube 31 is welded on the top of the electric energy meter 2, one end of the connecting mechanism 3 is integrally formed with a guide sleeve 26, the lifting tube 31 passes upward from the inside of the guide sleeve 26, and the inner wall of the guide sleeve 26 fits with the surface of the lifting tube 31, the connecting mechanism 3 The other end is welded to the bonding component 4 as a whole, a detection board 7 is inserted on the top of the bonding component 4, a block 28 is screwed on the back of the detection board 7, and the detection board 7 is embedded in the inside of the bonding component 4 through the block 28, shielding components 6 are inserted at both ends of the bonding component 4, and the shielding components 6 cover the surface of the photovoltaic panel 1 to be tested, and the rear end of the electric energy meter 2 is integrally formed with a back plate 8, and a locking mechanism 5 is installed on the surface of the back plate 8, and the top of the locking mechanism 5 is against the bottom surface of the photovoltaic panel 1 to be tested. The photovoltaic electric field fault detection device is used to measure whether the power generation of the photovoltaic panel 1 to be tested meets the standard to complete the measurement of whether it has a fault.

[0029] When the present invention is used, the top fitting component 4 is first placed on the surface of the photovoltaic panel 1 to be tested, and the fitting component 4 is used to push along the surface of the photovoltaic panel 1 to be tested until the lower hanging plate 21 on the rear end connecting mechanism 3 is partially pressed against the side of the photovoltaic panel 1 to be tested, and then the locking mechanism 5 can be used to press the top extrusion guide roller 11 against the bottom of the photovoltaic panel 1 to be tested, and the locking bolt 27 is used to lock the connecting mechanism 3 part, and the detection process of the entire detection device can be completed. During the detection, the electric energy meter 2 is connected to the detection board 7 and the photovoltaic panel 1 to be tested at the same time, and the independent photovoltaic module on the detection board 7 is used to generate electricity, and the power data obtained by the detection board 7 within a certain period of time is obtained. After the electric energy meter 2 is connected to the photovoltaic panel 1 to be tested, the power generation of the photovoltaic panel 1 to be tested is measured at the same time, and the power generation obtained by the detection board 7 is used as reference data. Finally, it is judged whether the power generation of the photovoltaic panel 1 to be tested meets the standard based on the construction area of ​​the two. Finally, it is determined whether the photovoltaic panel 1 to be tested has an operational fault. When power generation is abnormal, the different surface areas of the photovoltaic panel 1 to be tested are shielded and covered by the shielding component 6 and then re-tested. This scheme can roughly determine the area range where the power generation fault occurs on the surface of the photovoltaic panel 1 to be tested.

[0030] In this embodiment, the bonding component 4 includes a bonding plate 13 and a groove 14, wherein the groove 14 is provided in the middle of the bonding plate 13, and insertion channels 15 are provided at both ends of the bonding plate 13, and a lower hanging plate 21 is integrally formed at one end of the bonding plate 13, and an end plate 22 is integrally formed at the top of the lower hanging plate 21. The lower hanging plate 21 is pressed against the side of the photovoltaic panel 1 to be tested, and the bottom of the bonding plate 13 is pressed against the surface of the photovoltaic panel 1 to be tested, and the shielding component 6 passes through the inside of the insertion channel 15, and a first rotating rod 23 is inserted into the inner side of the end plate 22, and one end of the detection plate 7 is welded to the surface of the first rotating rod 23. The bottom of the detection plate 7 is used to press on the surface of the bonding plate 13, and the width of the block 28 is the same as the width of the groove 14, and the side of the block 28 is mounted with an anti-slip pad. A detection board 7 is installed on the top of the bonding component 4. By keeping the detection board 7 completely parallel to the photovoltaic panel and synchronously receiving light to generate electricity, standard power generation data can be obtained according to the installation angle, irradiation status and actual detection time of different photovoltaic panels, so as to rely on the data to detect whether there is a fault in the photovoltaic panel 1 to be tested, thereby improving the reliability of the detection data.

[0031] Specifically, when the detection device is installed, the bonding plate 13 is directly pressed on the surface of the photovoltaic panel 1 to be tested, and the lower hanging plate 21 at the rear end is pressed against the side of the photovoltaic panel 1 to be tested. After the bonding plate 13 is kept parallel to the photovoltaic panel 1 to be tested, when the detection plate 7 is subsequently rotated and pressed onto the bonding plate 13, it can be ensured that the detection plate 7 and the photovoltaic panel 1 to be tested are also kept parallel. Therefore, changes in the installation position angle of different photovoltaic panels 1 to be tested can make the detection plate 7 in the same state, and during subsequent measurements, the power generation of the detection plate 7 and the photovoltaic panel 1 to be tested will also be detected at the same time, thereby ensuring that the power generation state and time of the photovoltaic panel 1 to be tested and the detection plate 7 are completely consistent, and there is only a difference in area, so as to obtain the reference data provided by the detection plate 7 to determine whether the power generation of the photovoltaic panel 1 to be tested is normal.

[0032] In this embodiment, the shielding assembly 6 includes a side baffle 16, a front baffle 18 and a light shielding film 19. The end of the side baffle 16 is movably connected to the end of the front baffle 18 through a hinge shaft 17. The inner side of the front baffle 18 is attached with a light shielding film 19, and the bottom of the side baffle 16 is attached with a rubber pad 20. A reeling shaft 29 is inserted into the inner wall of the groove 14, and the other end of the light shielding film 19 is wound on the surface of the reeling shaft 29. A gap 30 is opened at the bottom of one side of the bonding plate 13, and the light shielding film 19 passes outward from the inside of the gap 30. The side baffle 16 is pressed on the surface of the photovoltaic panel 1 to be tested through the rubber pad 20 at the bottom, and the bottom of the front baffle 18 is directly pressed on the photovoltaic panel 1 to be tested. A shielding component 6 is installed on the inner side of the bonding component 4. Therefore, when there is an abnormality in the overall power generation of a large photovoltaic panel, different photovoltaic module areas can be shielded in turn by dividing the areas into sections, and the power generation can be re-detected. Ultimately, it can assist in determining the approximate location of the faulty photovoltaic module, and thus obtain more detailed fault information.

[0033] Specifically, when covering a partial surface area of ​​the photovoltaic panel 1 to be tested by the shielding component 6, first pull the side baffle 16 so that the side baffle 16 and the hinge shaft 17 are partially rotated to the same straight line. At this time, the front baffle 18 can be pulled to pass the side baffle 16 and the hinge shaft 17 directly through the inside of the insertion channel 15. In this process, the shading film 19 can also be pulled by the front baffle 18 to pull it out from the surface of the winding shaft 29, so that the shading film 19 blocks a partial area of ​​the surface of the photovoltaic panel 1 to be tested. The shielding effect can avoid partial areas on the photovoltaic panel 1 to be tested, and only measure the power generation of the photovoltaic panel 1 to be tested in other areas.

[0034] In this embodiment, the connection mechanism 3 includes a support plate 25 and a guide sleeve 26. The inner side of the end plate 22 is also plugged with a second rotating rod 24. One end of the support plate 25 is welded to the surface of the second rotating rod 24. The other end of the support plate 25 is integrally formed with a guide sleeve 26. The inner side of the guide sleeve 26 is integrally formed with a support plate 35. The side of the guide sleeve 26 is inserted with a locking bolt 27. One side of the lifting tube 31 is provided with a threading groove 33. The other side of the lifting tube 31 is provided with a plurality of locking screw holes 32. The locking bolt 27 passes through the side of the guide sleeve 26 and then is embedded in the locking screw hole 32. The support plate 35 is pressed on the surface of the threading groove 33. Specifically, after the lifting tube 31 on the electric energy meter 2 passes through the inside of the guide sleeve 26, the electric energy meter 2 body can be placed in a state of approximate disposal by the rotation effect of the second rotating rod 24 itself. Then, the locking bolt 27 can be used to fix the electric energy meter 2 again and position and lock the entire detection device.

[0035] In this embodiment, the locking mechanism 5 includes a support plate 9 and an extrusion guide roller 11. The surface of the support plate 9 is interspersed with a lifting rod 10. The top of the lifting rod 10 is integrally formed with an extrusion column 34. The bottom of the extrusion column 34 is inserted with a screw rod 12, and the surface of the extrusion column 34 is sleeved with an extrusion guide roller 11. The screw rod 12 passes through the surface of the support plate 9, and the end of the screw rod 12 is movably connected to the bottom of the extrusion column 34 through a bearing. The extrusion guide roller 11 is used to lean against the bottom position of the photovoltaic panel 1 to be tested. The rear end of the electric energy meter 2 is leaned against the bottom position of the photovoltaic panel 1 to be tested through the locking mechanism 5, and the squeezing guide roller 11 provides a leaning support effect. When the detection of the photovoltaic panel or one of its areas is completed later, there is no need to disassemble and assemble any position of the entire detection device. After being directly pulled out along the inclined surface of the photovoltaic panel, it can be re-inserted for detection, thereby improving the work efficiency of large-scale detection.

[0036] Specifically, by rotating the screw rod 12 at the bottom, the extrusion column 34 can be pushed upward through the bearing at the top, and finally the extrusion guide rollers 11 on both sides are pressed against the bottom of the photovoltaic panel 1 to be tested, so as to complete the clamping and fixation of the entire detection device. After completing the detection of the photovoltaic panel 1 to be tested or the detection process of a partial area on the surface of the photovoltaic panel 1 to be tested, the electric energy meter 2 is directly pulled and pulled out along the surface of the photovoltaic panel 1 to be tested. At this time, the distance between the top of the extrusion guide roller 11 and the bonding plate 13 will not change. Subsequently, the bonding plate 13 is directly pulled and placed in the new area of ​​the photovoltaic panel 1 to be tested, and the re-placement process of the detection device can be completed directly by insertion.

[0037] The basic principles and main features of the present invention and the advantages of the present invention are shown and described above. For those skilled in the art, it is obvious that the present invention is not limited to the details of the above exemplary embodiments, and the present invention can be implemented in other specific forms without departing from the spirit or basic characteristics of the present invention.

[0038] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims

1. A photovoltaic electric field fault detection device, comprising a fault detection device body and a photovoltaic panel to be tested (1), characterized in that: The fault detection device body comprises a connecting mechanism (3), a fitting component (4), an electric energy meter (2) and a shielding component (6); a lifting tube (31) is welded to the top of the electric energy meter (2); a guide sleeve (26) is integrally formed at one end of the connecting mechanism (3); the lifting tube (31) extends upward from the inside of the guide sleeve (26), and the inner wall of the guide sleeve (26) fits with the surface of the lifting tube (31); the other end of the connecting mechanism (3) is welded to the fitting component (4) as a whole; the fitting component (4) A detection board (7) is inserted at the top of the detection board (7), a clamping block (28) is screwed on the back of the detection board (7), and the detection board (7) is embedded into the interior of the fitting component (4) through the clamping block (28), shielding components (6) are inserted at both ends of the fitting component (4), and the shielding components (6) cover the surface of the photovoltaic panel (1) to be tested, and the rear end of the electric energy meter (2) is integrally formed with a back plate (8), and a locking mechanism (5) is installed on the surface of the back plate (8), and the top of the locking mechanism (5) is against the bottom surface of the photovoltaic panel (1) to be tested, so that The laminating assembly (4) comprises a laminating plate (13) and a groove (14), wherein the groove (14) is provided in the middle of the laminating plate (13), and insertion channels (15) are provided at both ends of the laminating plate (13), a lower hanging plate (21) is integrally formed at one end of the laminating plate (13), and an end plate (22) is integrally formed at the top of the lower hanging plate (21), the lower hanging plate (21) is pressed against the side of the photovoltaic panel (1) to be tested, and the bottom of the laminating plate (13) is pressed against the surface of the photovoltaic panel (1) to be tested, and the shielding assembly The member (6) passes through the inside of the insertion channel (15), a first rotating rod (23) is inserted into the inner side of the end plate (22), one end of the detection plate (7) is welded to the surface of the first rotating rod (23), the bottom of the detection plate (7) is used to press on the surface of the bonding plate (13), and the width of the block (28) is the same as the width of the groove (14), and the side of the block (28) is attached with an anti-slip pad, an independent photovoltaic module is arranged on the detection plate (7), and the electric energy meter (2) is connected with the detection plate (7) and the photovoltaic panel (1) to be tested by electric wires.

2. A photovoltaic electric field fault detection device according to claim 1, characterized in that: The shielding assembly (6) comprises a side baffle (16), a front baffle (18) and a shading film (19); the end of the side baffle (16) is movably connected to the end of the front baffle (18) via a hinge shaft (17); the inner side of the front baffle (18) is attached with a shading film (19); and the bottom of the side baffle (16) is attached with a rubber pad (20).

3. A photovoltaic electric field fault detection device according to claim 2, characterized in that: A reeling shaft (29) is inserted into the inner wall of the groove (14), the other end of the shading film (19) is wound on the surface of the reeling shaft (29), a gap (30) is provided at the bottom of one side of the bonding plate (13), the shading film (19) passes outward from the inside of the gap (30), the side baffle (16) is pressed against the surface of the photovoltaic panel (1) to be tested via a rubber pad (20) at the bottom, and the bottom of the front baffle (18) is directly pressed against the photovoltaic panel (1) to be tested.

4. A photovoltaic electric field fault detection device according to claim 1, characterized in that: The connecting mechanism (3) comprises a support plate (25) and a guide sleeve (26); a second rotating rod (24) is inserted into the inner side of the end plate (22); one end of the support plate (25) is welded to the surface of the second rotating rod (24); the other end of the support plate (25) is integrally formed with the guide sleeve (26); and a supporting plate (35) is integrally formed on the inner side of the guide sleeve (26).

5. A photovoltaic electric field fault detection device according to claim 4, characterized in that: A locking bolt (27) is inserted through the side of the guide sleeve (26), a threading groove (33) is provided on one side of the lifting tube (31), and a plurality of locking screw holes (32) are provided on the other side of the lifting tube (31). The locking bolt (27) passes through the side of the guide sleeve (26) and is embedded in the locking screw hole (32), and the supporting plate (35) is pressed against the surface of the threading groove (33).

6. A photovoltaic electric field fault detection device according to claim 4, characterized in that: The locking mechanism (5) comprises a support plate (9) and an extrusion guide roller (11); a lifting rod (10) is inserted into the surface of the support plate (9); an extrusion column (34) is integrally formed at the top of the lifting rod (10); a screw rod (12) is inserted into the bottom of the extrusion column (34); and an extrusion guide roller (11) is sleeved on the surface of the extrusion column (34).

7. A photovoltaic electric field fault detection device according to claim 6, characterized in that: The screw rod (12) passes through the surface of the support plate (9), and the end of the screw rod (12) is movably connected to the bottom of the extrusion column (34) through a bearing, and the extrusion guide roller (11) is used to abut against the bottom position of the photovoltaic panel (1) to be tested.

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