Photovoltaic cell EL defect sorter

Abstract

The utility model discloses a photovoltaic cell EL defect sorter, and relates to the technical field of sorters. Comprising a sorter main body, the sorter main body is provided with a photovoltaic cell EL defect detection mechanism, the detection mechanism comprises a moving assembly, the moving assembly comprises an opening groove formed in the top end of the sorter main body, a positioning rod is fixed to the inner wall of the opening groove, and a sliding rail support is slidably connected to the outer wall of the positioning rod; after the camera lens is detected, the protective shell is screwed on the bolt rod on the outer side of the camera lens, the camera lens is protected through the protective shell, external physical collision and scraping can be effectively resisted, tools, parts and other hard objects are prevented from directly impacting the lens under the daily operation, maintenance or unexpected conditions of equipment, and the camera lens is protected. The surface of the lens is prevented from being scratched and damaged, the optical structure integrity of the lens is protected, the definition and accuracy of a detection image are guaranteed, and pollution of impurities and dust is prevented.

Description

Technical Field

[0001] This utility model relates to the field of sorting instrument technology, specifically a photovoltaic cell EL defect sorting instrument. Background Technology

[0002] Against the backdrop of continuously growing global demand for clean energy, the photovoltaic industry, as an important green energy sector, has experienced rapid development. As the core component of photovoltaic modules, the quality of photovoltaic cells directly determines the power generation efficiency and lifespan of the modules. Therefore, high-precision defect detection of photovoltaic cells is crucial. Electroluminescence (EL) inspection technology, with its ability to effectively detect internal defects such as microcracks, fragments, black cores, and black edges in photovoltaic cells, has become an important means of quality inspection for photovoltaic cells. EL defect sorting instruments based on this technology are also widely used in production lines.

[0003] Photovoltaic cell EL defect sorting instruments utilize camera detection to convert electroluminescence phenomena into image information and analyze it. When a photovoltaic cell is connected to the sorting instrument's circuit system, it is forward biased at a relatively low voltage (typically a few volts to tens of volts). At this time, electrons and holes inside the cell recombine, releasing energy in the form of photons, thus producing electroluminescence. Cells in different states, such as those with microcracks, fragments, black cores, or black edges, exhibit different electron-hole recombination patterns, resulting in differences in luminescence intensity and distribution. The camera lens plays a crucial role in the sorting instrument. This lens possesses high sensitivity and high resolution, enabling it to capture even the faint light signals emitted by the cells.

[0004] In the cell positioning stage, some sorting instruments use relatively simple limiting clamping structures, which make it difficult to achieve accurate positioning of the cells. During the transport process, the cells need to be conveyed into the interior of the sorting instrument, and it is not convenient to provide buffer protection when stopping. At the same time, the detection lens position of existing sorting instruments is relatively fixed, and the detection angle cannot be flexibly adjusted, resulting in a large detection blind zone. It is difficult to perform all-round detection of the cells, and it is easy to miss some minor defects. After the detection is completed, due to the lack of effective protective measures, dust, impurities and other contaminants can easily adhere to the lens surface, interfering with the EL image shooting effect. Therefore, this utility model provides a photovoltaic cell EL defect sorting instrument. Utility Model Content

[0005] To address the shortcomings of existing technologies, this invention provides a photovoltaic cell EL defect sorting instrument, which solves the aforementioned problems.

[0006] To achieve the above objectives, this utility model provides the following technical solution: a photovoltaic cell EL defect sorting instrument, comprising a sorting instrument body, wherein the sorting instrument body is provided with a detection mechanism for photovoltaic cell EL defects, the detection mechanism comprising:

[0007] The moving component includes an opening slot at the top of the sorting instrument body, a positioning rod fixed to the inner wall of the opening slot, a slide rail bracket slidably connected to the outer wall of the positioning rod, and a camera lens connected by a threaded assembly inside the slide rail bracket.

[0008] The limiting component includes a first electric push rod that is fixed through all four ends of the sorting instrument body. The telescopic end of the first electric push rod is fixed with a mounting plate. The inside of the mounting plate is a push plate connected by a telescopic component. The inner wall of the push plate is provided with a first limiting plate connected by an elastic component.

[0009] Preferably, the main body of the sorting instrument is fixed with support frames on both sides, and the upper surface of the support frames is provided with a conveyor belt for feeding photovoltaic cells.

[0010] Preferably, a first screw is rotatably connected to the inner wall of the opening groove, the first screw is threadedly connected to the other end of the slide rail bracket, the threaded assembly includes a second screw rotatably connected inside the slide rail bracket, a slider is slidably connected to the inner wall of the slide rail bracket, and the camera lens is fixedly connected to the lower end of the slider.

[0011] Preferably, the outer wall of the camera lens is provided with a bolt rod, and the outer wall of the bolt rod is provided with a threaded protective housing.

[0012] Preferably, the telescopic component includes a second electric push rod that is fixedly fixed inside the mounting plate, and the push plate is fixedly connected to the telescopic end of the second electric push rod. The elastic component includes a shock-absorbing spring fixed to the inner wall of the push plate, and a first limiting plate is fixedly connected to the end of the shock-absorbing spring. A damping support rod is provided on the inner ring of the shock-absorbing spring, and the damping support rod is fixedly connected to the push plate. A telescopic sleeve rod is fixed to the inner wall of the first limiting plate, and the end of the telescopic sleeve rod is fixedly connected to the push plate.

[0013] Preferably, a third electric push rod is fixedly installed through both sides of the main body of the sorting instrument, and the telescopic end of the third electric push rod extends into the main body of the sorting instrument and is fixed with a second limiting plate at one end.

[0014] Beneficial effects

[0015] This invention provides a photovoltaic cell EL defect sorting instrument. Compared with the prior art, it has the following advantages:

[0016] Firstly, the second electric push rod on the mounting plate of this utility model drives the limiting plate to limit and clamp the solar cells transported into the sorting instrument body. The second limiting plate is located on both sides inside the sorting instrument body and is extended and retracted by the third electric push rod to further limit the transported photovoltaic solar cells. This achieves precise positioning of the photovoltaic cells within the sorting instrument body. During EL testing, the position of the solar cells is fixed, ensuring stable and accurate images acquired by the multi-angle EL testing lens group and other testing structures. This avoids misjudgment of defects caused by solar cell displacement, improving testing accuracy. The first limiting plate is connected to the push plate via an elastic component composed of a shock-absorbing spring, a damping support rod, and a telescopic sleeve rod. Next, when the solar cells are conveyed to the limiting plate, the shock-absorbing spring absorbs the impact force, the damping support rod suppresses excessive oscillation of the spring, and the telescopic sleeve ensures the stability of the limiting plate's movement. The three work together to provide flexible buffering for the solar cells, avoiding scratches, cracks, and other damage to the surface of the solar cells caused by rigid contact, thus protecting the integrity of the solar cells. Then, the first limiting plate can be raised and lowered by the first electric push rod, and the second electric push rod controls the extension and retraction of the push plate. At the same time, the second limiting plate is controlled by the third electric push rod. The limiting range and clamping force can be flexibly adjusted according to photovoltaic solar cells of different sizes and shapes, so that the sorting instrument can be compatible with the detection of solar cells of various specifications, improving the equipment's versatility and application range.

[0017] Secondly, the camera lens of this invention can be flexibly adjusted in both longitudinal and lateral dimensions, enabling all-round inspection of the photovoltaic panels inside the sorting instrument body. This greatly expands the inspection range, avoids blind spots caused by fixed inspection angles, and ensures clear and accurate EL images, thereby improving the accuracy of photovoltaic cell defect identification. It helps to more accurately determine whether photovoltaic cells have defects such as microcracks or fragments. The camera lens position does not need to be manually adjusted, realizing the automation of the inspection process. After the camera lens has been inspected, the protective shell is screwed onto the bolt rod on the outside of the camera lens. The protective shell protects the camera lens and can effectively resist external physical collisions and scratches. During daily operation, maintenance, or accidental situations, it prevents hard objects such as tools and parts from directly impacting the lens, avoiding scratches and damage to the lens surface, protecting the integrity of the lens's optical structure, ensuring the clarity and accuracy of the inspection images, and preventing contamination by impurities and dust. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0019] Figure 2 This is a schematic diagram of the internal structure of the sorting instrument of this utility model;

[0020] Figure 3 This is a schematic diagram of the internal structure of the opening groove of this utility model;

[0021] Figure 4 This is a schematic diagram of the protective shell connection structure of this utility model.

[0022] In the diagram: 1. Main body of the sorting instrument; 2. Support frame; 201. Conveyor belt; 3. Opening groove; 301. Positioning rod; 302. Slide rail bracket; 303. First screw; 304. Second screw; 305. Slider; 4. Camera lens; 401. Bolt rod; 402. Protective housing; 5. First electric push rod; 501. Mounting plate; 502. Second electric push rod; 503. Push plate; 504. Shock-absorbing spring; 505. Damping support rod; 506. First limiting plate; 507. Telescopic sleeve rod; 6. Third electric push rod; 601. Second limiting plate. Detailed Implementation

[0023] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0024] Please see Figures 1-4 This utility model provides a technical solution: a photovoltaic cell EL defect sorting instrument, including a sorting instrument body 1, on which a detection mechanism for photovoltaic cell EL defects is provided, the detection mechanism including:

[0025] The moving component includes an opening groove 3 at the top of the sorting instrument body 1. A positioning rod 301 is fixed to the inner wall of the opening groove 3. A slide rail bracket 302 is slidably connected to the outer wall of the positioning rod 301. A camera lens 4 connected by a threaded assembly is provided inside the slide rail bracket 302.

[0026] The limiting component includes a first electric push rod 5 that is fixed through all four ends of the sorting instrument body 1. The telescopic end of the first electric push rod 5 is fixed with a mounting plate 501. The inside of the mounting plate 501 is a push plate 503 connected by a telescopic component. The inner wall of the push plate 503 is provided with a first limiting plate 506 connected by an elastic component.

[0027] In a preferred embodiment, a support frame 2 is fixed on both sides of the sorting instrument body 1. A conveyor belt 201 for feeding photovoltaic cells is provided on the upper surface of the support frame 2. The conveyor belt 201 is driven by a motor. The photovoltaic cells to be tested are placed on the conveyor belt 201 and then sent into the interior of the sorting instrument body 1. This greatly improves the conveying efficiency of photovoltaic cells, enables continuous operation, meets the needs of large-scale production testing, and reduces labor costs and labor intensity.

[0028] In a preferred embodiment, a first screw 303 is rotatably connected to the inner wall of the opening groove 3. The first screw 303 is threadedly connected to the other end of the slide rail bracket 302. The threaded assembly includes a second screw 304 rotatably connected inside the slide rail bracket 302. A slider 305 is slidably connected to the inner wall of the slide rail bracket 302. The camera lens 4 is fixedly connected to the lower end of the slider 305. Both the first screw 303 and the second screw 304 are driven by a micro motor. When the first screw 303 rotates, it achieves longitudinal sliding of the slide rail bracket 302. When the second screw 304 rotates, it drives the slider 305 to slide on the slide rail bracket 302. The internal horizontal sliding mechanism 2 drives the camera lens 4 at the lower end of the slider 305 to perform all-round inspection of the photovoltaic panels inside the sorting instrument body 1. This allows the camera lens 4 to flexibly adjust its position in both the vertical and horizontal dimensions, enabling all-round inspection of the photovoltaic panels inside the sorting instrument body 1. This greatly expands the inspection range, avoids blind spots caused by a fixed inspection angle, and ensures that the captured EL images are clear and accurate. This improves the accuracy of photovoltaic cell defect identification and helps to more accurately determine whether there are defects such as microcracks or fragments in the photovoltaic cells. The camera lens 4 can be automatically adjusted without manual intervention, thus automating the inspection process.

[0029] In a preferred embodiment, the outer wall of the camera lens 4 is provided with a bolt rod 401, and the outer wall of the bolt rod 401 is provided with a threaded protective housing 402. When the camera lens 4 is being tested, the protective housing 402 is screwed onto the bolt rod 401 on the outside of the camera lens 4. The protective housing 402 protects the camera lens 4 and can effectively resist external physical collisions and scratches. During daily operation, maintenance or accidental situations, it prevents hard objects such as tools and parts from directly impacting the lens, avoids scratches and damage to the lens surface, protects the integrity of the lens's optical structure, ensures the clarity and accuracy of the test image, and prevents contamination by impurities and dust.

[0030] In a preferred embodiment, the telescopic component includes a second electric push rod 502 fixedly through the interior of the mounting plate 501, a push plate 503 fixedly connected to the telescopic end of the second electric push rod 502, and an elastic component including a shock-absorbing spring 504 fixedly to the inner wall of the push plate 503, a first limiting plate 506 fixedly connected to the end of the shock-absorbing spring 504, a damping support rod 505 provided on the inner ring of the shock-absorbing spring 504, the damping support rod 505 fixedly connected to the push plate 503, a telescopic sleeve rod 507 fixedly to the inner wall of the first limiting plate 506, the end of the telescopic sleeve rod 507 fixedly connected to the push plate 503, and third electric push rods 6 fixedly through the interiors of both sides of the sorting instrument body 1, with the telescopic ends of the third electric push rods 6 extending into the interior of the sorting instrument body 1. A second limiting plate 601 is fixed at one end. Four sets of first limiting plates 506 are arranged in a matrix inside the main body 1 of the sorting instrument. When photovoltaic cells are conveyed via the conveyor belt 201, two sets of limiting plates rise via electric push rods, while the other two sets adhere to the conveyor belt 201. The photovoltaic cells are then conveyed to the inner wall of the limiting plates adhered to the conveyor belt 201. The limiting plates, under the action of shock-absorbing springs 504 and damping rods 505 along the telescopic sleeve 507, provide shock absorption and buffering on the inner wall of the push plate 503, thus limiting and blocking the photovoltaic cells. Two sets of limiting plates then descend via electric push rods. The second electric push rod 502 on the mounting plate 501 drives the limiting plates, thus controlling the movement of the photovoltaic cells conveyed to the push plate 503. The solar cells inside the sorting instrument body 1 are clamped and positioned, and the second limiting plate 601 is located on both sides inside the sorting instrument body 1. It is extended and retracted by the third electric push rod 6 to further limit the transported photovoltaic cells. This allows for precise positioning of the photovoltaic cells within the sorting instrument body 1. During EL testing, the cell position is fixed, ensuring stable and accurate images acquired by the multi-angle EL testing lens group and other testing structures. This avoids misjudgments of defects caused by cell offset, improving testing accuracy. The first limiting plate 506 is connected to the push plate 503 via an elastic assembly consisting of a shock-absorbing spring 504, a damping support rod 505, and a telescopic sleeve rod 507. When the cell is transported to the limiting plate, the shock-absorbing spring 504 absorbs the impact force, preventing... The support rod 505 can suppress excessive oscillation of the spring, and the telescopic sleeve rod 507 ensures stable movement of the limiting plate. The three work together to provide flexible buffer for the solar cell, avoiding scratches, cracks and other damage to the surface of the solar cell caused by rigid contact, and protecting the integrity of the solar cell. Then, the first limiting plate 506 can be raised and lowered by the first electric push rod 5, and the push plate 503 can be extended and retracted in conjunction with the second electric push rod 502. At the same time, the second limiting plate 601 is extended and retracted by the third electric push rod 6. The limiting range and clamping force can be flexibly adjusted according to the photovoltaic solar cells of different sizes and shapes, so that the sorting instrument can be compatible with the detection of solar cells of various specifications, improving the versatility and application range of the equipment. The micro motor model is N30-050, and the motor model is Y2-200L1-2Y.

[0031] Furthermore, any content not described in detail in this specification is existing technology known to those skilled in the art.

[0032] During operation, the conveyor belt 201 is driven by a motor. The photovoltaic cells to be tested are placed on the conveyor belt 201 and then transported into the sorting instrument body 1. Four sets of first limiting plates 506 are arranged in a matrix inside the sorting instrument body 1. As the photovoltaic cells are conveyed by the conveyor belt 201, two sets of limiting plates rise via electric push rods, while the other two sets adhere to the conveyor belt 201. The photovoltaic cells are then conveyed by the conveyor belt 201 to the inner wall of the limiting plates adhered to the conveyor belt 201. The limiting plates are then controlled by shock-absorbing springs 50. 4. The damping support rod 505, along with the telescopic sleeve rod 507, performs shock absorption and buffering on the inner wall of the push plate 503, limiting and blocking the photovoltaic cells. Then, two sets of limiting plates are lowered by electric push rods. The second electric push rod 502 on the mounting plate 501 drives the limiting plate to limit and clamp the cells conveyed into the sorting instrument body 1. The second limiting plate 601 is located on both sides inside the sorting instrument body 1 and is extended and retracted by the third electric push rod 6 to further limit the conveyed photovoltaic cells, thus achieving precise positioning of the photovoltaic cells in the sorting instrument body 1.

[0033] Both the first screw 303 and the second screw 304 are driven by a micro motor. When the first screw 303 rotates, it enables the longitudinal sliding of the slide rail bracket 302. When the second screw 304 rotates, it drives the slider 305 to slide laterally inside the slide rail bracket 302. This causes the camera lens 4 at the lower end of the slider 305 to perform all-round inspection of the photovoltaic panels inside the sorting instrument body 1. This allows the camera lens 4 to flexibly adjust its position in both the longitudinal and lateral dimensions, enabling all-round inspection of the photovoltaic panels inside the sorting instrument body 1.

[0034] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0035] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A photovoltaic cell EL defect sorter comprising a sorter body (1), characterised in that: The sorting instrument body (1) is equipped with a detection mechanism for EL defects in photovoltaic cells, the detection mechanism including: The moving component includes an opening slot (3) at the top of the sorting instrument body (1), a positioning rod (301) is fixed on the inner wall of the opening slot (3), a slide rail bracket (302) is slidably connected to the outer wall of the positioning rod (301), and a camera lens (4) connected by a threaded assembly is provided inside the slide rail bracket (302). The limiting component includes a first electric push rod (5) that is fixed through all four ends of the sorting instrument body (1). The telescopic end of the first electric push rod (5) is fixed with a mounting plate (501). The inside of the mounting plate (501) is provided with a push plate (503) connected by a telescopic component. The inner wall of the push plate (503) is provided with a first limiting plate (506) connected by an elastic component.

2. The photovoltaic cell EL defect sorter of claim 1, wherein: The main body (1) of the sorting instrument is fixed with a support frame (2) on both sides, and the upper end of the support frame (2) is provided with a conveyor belt (201) for feeding photovoltaic cells.

3. The photovoltaic cell EL defect sorter of claim 1, wherein: The inner wall of the opening groove (3) is rotatably connected to a first screw (303), and the first screw (303) is threadedly connected to the other end of the slide rail bracket (302). The threaded assembly includes a second screw (304) rotatably connected inside the slide rail bracket (302). The inner wall of the slide rail bracket (302) is slidably connected to a slider (305), and the camera lens (4) is fixedly connected to the lower end of the slider (305).

4. The photovoltaic cell EL defect sorting instrument according to claim 1, characterized in that: The outer wall of the camera lens (4) is provided with a bolt rod (401), and the outer wall of the bolt rod (401) is provided with a threaded protective shell (402).

5. The photovoltaic cell EL defect sorter of claim 1, wherein: The telescopic component includes a second electric push rod (502) that is fixedly inserted inside the mounting plate (501). The push plate (503) is fixedly connected to the telescopic end of the second electric push rod (502). The elastic component includes a shock-absorbing spring (504) fixed to the inner wall of the push plate (503). The first limiting plate (506) is fixedly connected to the end of the shock-absorbing spring (504). The inner ring of the shock-absorbing spring (504) is provided with a damping support rod (505). The damping support rod (505) is fixedly connected to the push plate (503). The inner wall of the first limiting plate (506) is fixed with a telescopic sleeve rod (507). The end of the telescopic sleeve rod (507) is fixedly connected to the push plate (503).

6. The photovoltaic cell EL defect sorter of claim 1, wherein: The sorting instrument body (1) has a third electric push rod (6) fixed inside both sides. The telescopic end of the third electric push rod (6) extends into the sorting instrument body (1) and a second limiting plate (601) is fixed at one end.

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