A photovoltaic module defect detection system

Abstract

The present invention belongs to the technical field of photovoltaic module inspection equipment and provides a photovoltaic module defect inspection system. The system comprises a conveying unit, comprising an AGV; a U-shaped positioning jig disposed on the AGV and used to position the photovoltaic module, the positioning jig having a positioning groove disposed on its inner side for positioning the photovoltaic module, with multiple positioning jigs arranged in sequence and spaced along the length of the AGV; an EL inspection unit, used to inspect the photovoltaic module and capable of reciprocating linear motion in the longitudinal direction between a first working position A and a second working position A; and a drive unit, used to drive the EL inspection unit to reciprocate linear motion between the first working position A and the second working position A. The photovoltaic module defect inspection system provided by the present invention has a simple structure, a reasonable design, high inspection efficiency, and low labor costs.

Description

Technical Field

[0001] The present invention relates to the technical field of photovoltaic module detection equipment, and in particular to a photovoltaic module defect detection system. Background Art

[0002] Currently, EL detectors are commonly used to detect defects in photovoltaic modules in order to improve the production quality of photovoltaic modules, reduce production costs, and increase the yield rate of modules leaving the factory.

[0003] like Figure 1 As shown, when the EL detector in the prior art detects photovoltaic modules, it usually requires two workers to lift the photovoltaic module to be detected onto the EL detector, and then perform the detection. After the detection is completed, the two workers will remove the detected photovoltaic module from the EL detector and lift the next photovoltaic module to be detected onto the EL detector. This process is repeated, which not only reduces the detection efficiency but also increases the labor cost. Summary of the Invention

[0004] In view of the defects in the prior art, the purpose of the present invention is to provide a photovoltaic module defect detection system that improves detection efficiency while reducing labor costs.

[0005] In order to achieve the above objectives, the present invention provides a photovoltaic module defect detection system, comprising:

[0006] A conveying unit, comprising:

[0007] AGVs; and

[0008] A positioning jig provided on the AGV and used to position the photovoltaic module is U-shaped, and a positioning groove for positioning the photovoltaic module is provided on its inner side. A plurality of the positioning jigs are sequentially spaced along the length direction of the AGV;

[0009] An EL detection unit, which is used to detect photovoltaic modules and can move back and forth in a longitudinal direction between a first working position A and a second working position A; and

[0010] A driving unit is used to drive the EL detection unit to perform reciprocating linear motion between the first working position A and the second working position A.

[0011] Furthermore, the conveying unit further includes:

[0012] A guide rail, which is fixedly connected to the AGV, and the positioning fixture is slidably connected to the guide rail;

[0013] a drive assembly, which is provided on the AGV and is used to drive the positioning fixture to move along the length direction of the guide rail; and

[0014] A locking component is used to lock the target positioning jig with the driving component and release the lock between the target positioning jig and the guide rail when the driving component needs to drive the target positioning jig to move; and to lock the positioning jig with the guide rail when the driving component does not need to drive the positioning jig to move so that the AGV can transport the photovoltaic component.

[0015] Furthermore, the driving assembly includes:

[0016] A slider, which is arranged at the bottom of the guide rail and is slidably connected to the AGV and the guide rail, and can perform reciprocating linear motion along the length direction of the guide rail;

[0017] a lead screw, which is rotatably connected to the AGV;

[0018] A nut, which is slidably connected to the AGV and fixedly connected to the slider; and

[0019] The motor is arranged on the AGV, and the power output shaft thereof is transmission-connected to the power input end of the lead screw.

[0020] Furthermore, the locking assembly includes:

[0021] a first locking socket provided on the guide rail and extending along the width direction of the guide rail;

[0022] a first locking pin adapted to fit within the first locking socket and slidably connected to the positioning jig, capable of reciprocating linear motion in the longitudinal direction between a first working position B and a second working position B, wherein when the first locking pin is in the first working position B, the first locking pin is retracted into the side wall of the positioning jig, and when the first locking pin is in the second working position B, the first locking pin is extended outside the side wall of the positioning jig;

[0023] a first elastic member disposed above the first locking pin, with its two ends respectively abutting against the first locking pin and the positioning fixture, and having a tendency to cause the first locking pin to move from the first working position B to the second working position B in a natural state;

[0024] A second locking socket, which is provided on the positioning jig, and whose projection on the horizontal plane with the first locking socket is a cross, an L or a T shape;

[0025] a second locking pin adapted to fit within the second locking receptacle, slidably connected to the slider and capable of reciprocating linear motion in the longitudinal direction between a first working position C and a second working position C, wherein when the second locking pin is in the first working position C, the second locking pin is retracted into the guide rail or the side wall of the slider, and when the second locking pin is in the second working position C, the second locking pin is extended beyond the side wall of the guide rail; and

[0026] A driving mechanism is used to drive the second locking pin to perform reciprocating linear motion between the first working position C and the second working position C.

[0027] Furthermore, the driving mechanism includes:

[0028] a permanent magnet embedded in the bottom end of the second locking pin;

[0029] an electromagnet disposed below the second locking pin, fixedly connected to the slider, wherein the permanent magnet and the electromagnet have opposite magnetic properties on opposite sides; and

[0030] The second elastic member is arranged below the second locking pin, and its two ends respectively abut against the second locking pin and the slider, and in a natural state, it has a tendency to move the second locking pin from the first working position C to the second working position C.

[0031] Furthermore, the driving unit includes an electric push rod, which is fixedly arranged above the EL detection unit, and a power output shaft of the electric push rod is fixedly connected to the EL detection unit.

[0032] Beneficial effects of the present invention:

[0033] The photovoltaic module defect detection system provided by the present invention has a simple structure and a reasonable design. It uses AGV to transport multiple photovoltaic modules at a time, and does not require manpower to carry the photovoltaic modules to be inspected and those that have been inspected, thus saving labor costs and improving detection efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following briefly describes the drawings required for the specific embodiments or the description of the prior art. Similar elements or parts are generally identified by similar reference numerals throughout the drawings. Elements or parts in the drawings are not necessarily drawn to scale.

[0035] Figure 1 A three-dimensional view of an EL detector in the prior art;

[0036] Figure 2A three-dimensional view of a photovoltaic module defect detection system provided by an embodiment of the present invention;

[0037] Figure 3 for Figure 2 A three-dimensional view of the internal structure of a conveying unit of a photovoltaic module defect detection system is shown;

[0038] Figure 4 for Figure 3 The front view shown;

[0039] Figure 5 for Figure 4 A cross-sectional view in the AA direction is shown;

[0040] Figure 6 for Figure 5 An enlarged view of point B is shown;

[0041] Figure 7 for Figure 2 A three-dimensional view of a positioning fixture of a photovoltaic module defect detection system is shown;

[0042] Figure 8 for Figure 7 Bottom view shown;

[0043] Figure 9 for Figure 2 A perspective view of the guide rails of a photovoltaic module defect detection system is shown.

[0044] Reference numerals:

[0045] Conveying unit 100, AGV 110, positioning fixture 120, positioning slot 121, guide rail 130, drive assembly 140, slider 141, screw 142, nut 143, motor 144, locking assembly 150, first locking socket 151, first locking pin 152, first elastic member 153, second locking socket 154, second locking pin 155, permanent magnet 156, electromagnet 157, second elastic member 158, EL detection unit 200, drive unit 300. DETAILED DESCRIPTION

[0046] The following embodiments of the technical solution of the present invention will be described in detail with reference to the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present invention and are therefore only examples and are not intended to limit the scope of protection of the present invention.

[0047] It should be noted that, unless otherwise specified, the technical or scientific terms used in this application should have the common meanings understood by those skilled in the art to which the present invention belongs.

[0048] In the description of this application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like to indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0049] In addition, the terms "first," "second," etc. are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. In the description of the present invention, "plurality" means more than two, unless otherwise specifically defined.

[0050] In this application, unless otherwise expressly specified or limited, terms such as "mounted," "connected," "connect," and "fixed" should be understood in a broad sense. For example, they may refer to fixed or detachable connections, or integration; mechanical or electrical connections; direct or indirect connections through an intermediate medium; and internal communication between two components or interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in this application based on specific circumstances.

[0051] In this application, unless otherwise expressly specified or limited, when a first feature is "above" or "below" a second feature, it may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Furthermore, when a first feature is "above," "above," or "above" a second feature, it may mean that the first feature is directly above or diagonally above the second feature, or simply means that the first feature is at a higher level than the second feature. When a first feature is "below," "below," or "below" a second feature, it may mean that the first feature is directly below or diagonally below the second feature, or simply means that the first feature is at a lower level than the second feature.

[0052] like Figure 2-9 As shown, the present invention provides a photovoltaic module defect detection system, which includes a conveying unit 100, an EL detection unit 200 and a driving unit 300.

[0053] The conveying unit 100 is used to convey the photovoltaic modules, specifically, to convey the photovoltaic modules to be inspected to the inspection station (ie, below the EL inspection unit 200 ) and to convey the inspected photovoltaic modules away from the inspection station.

[0054] The conveying unit 100 includes an AGV 110 and a positioning jig 120. The AGV 110 is used to load and transport photovoltaic modules. The positioning jig 120 is mounted on the AGV 110 and is used to position the photovoltaic modules. The positioning jig 120 is U-shaped and has a positioning groove 121 on its inner side for positioning the photovoltaic modules. When in use, the photovoltaic module is positioned and fixed in the positioning groove 121. There are multiple positioning jigs 120, and the multiple positioning jigs 120 are arranged in sequence along the length direction of the AGV 110.

[0055] The EL detection unit 200 is used to inspect photovoltaic modules, and it can perform reciprocating linear motion between a first working position A and a second working position A in the longitudinal direction. During use, when the AGV 110 transports the photovoltaic module to be inspected to the inspection station, the EL detection unit 200 moves downward from the first working position A to the second working position A, and thus moves to the front side of one of the photovoltaic modules placed on the AGV 110. After the inspection is completed, the EL detection unit 200 rises from the second working position A to the first working position A, and the AGV 110 moves forward one working position with the photovoltaic module. Afterwards, the EL detection module descends again to the second working position A to inspect the next photovoltaic module. Specifically, the EL detection module includes a body and a plurality of infrared cameras arranged in the body, as well as a control component for controlling the operation of the equipment and the transmission of camera shooting. These are all existing technologies and will not be elaborated on here.

[0056] The drive unit 300 is used to drive the EL detection unit 200 to perform reciprocating linear motion between a first working position A and a second working position A. Specifically, the drive unit 300 includes an electric push rod, which is fixedly mounted above the EL detection unit 200. The power output shaft of the push rod is fixedly connected to the EL detection unit 200. During operation, the push rod extends, thereby driving the EL detection unit 200 downward from the first working position A to the second working position A. The push rod retracts, thereby driving the EL detection unit 200 upward from the second working position A to the first working position A.

[0057] During use, the PV module to be inspected is placed on the AGV 110, which then transports it to the inspection station. The drive unit 300 then drives the EL inspection unit 200 downward from the first working position A to the second working position A, thereby moving it to the front of the PV module closest to the vehicle head on the AGV 110 for inspection and achieving close contact with the PV module, thereby achieving the purpose of inspecting the PV module.

[0058] After the inspection of one photovoltaic module is completed, the drive unit 300 drives the EL inspection unit 200 to rise, and then the AGV 110 moves the photovoltaic module forward to a working position, so that the next photovoltaic module is located at the inspection station. The above steps are repeated until all photovoltaic modules on the AGV 110 are inspected.

[0059] The photovoltaic module defect detection system provided by the present invention has a simple structure and a reasonable design. It can transport multiple photovoltaic modules at a time through AGV110, and does not require manpower to carry the photovoltaic modules to be inspected and those that have been inspected, thereby saving labor costs and improving detection efficiency.

[0060] However, the above-described conveyor unit 100 has the disadvantage that if the positioning jig 120 cannot move on the AGV 110, the distance between any two adjacent photovoltaic modules must be greater than or equal to the thickness of the EL detection unit 200, thereby wasting space and reducing the conveying efficiency of the AGV 110. Therefore, in one embodiment, the conveyor unit 100 further includes a guide rail 130, a drive assembly 140, and a locking assembly 150.

[0061] The guide rail 130 is fixedly connected to the AGV 110, and the positioning jig 120 is slidably connected to the guide rail 130. Specifically, there are two guide rails 130, one on each side of the AGV 110 and fixedly connected to the AGV 110. Connectors with U-shaped grooves are fixedly mounted on both sides of the bottom of the positioning jig 120, and the positioning jig 120 is slidably connected to the guide rails 130 through these connectors.

[0062] The drive assembly 140 is mounted on the AGV 110 and is used to drive the positioning jig 120 to move along the length of the guide rail 130. During operation, the AGV 110 transports the photovoltaic modules to the inspection station and aligns the photovoltaic module closest to the front of the AGV 110 with the EL detection unit 200. The drive unit 300 then drives the EL detection unit 200 downward from the first working position A to the second working position A, thereby inspecting the photovoltaic modules. After the inspection is completed, the drive unit 300 returns the EL detection unit 200 from the second working position A to the first working position A. The drive assembly 140 then moves the positioning jig 120 corresponding to the inspected photovoltaic module toward the front of the AGV 110 by a set distance A. Simultaneously, the AGV 110 moves forward by a set distance B, thereby aligning the next photovoltaic module with the EL detection unit 200. These steps are repeated until all photovoltaic modules on the AGV 110 have been inspected. AGV110 then leaves with the inspected PV panels.

[0063] The locking assembly 150 is used to lock the target positioning jig 120 with the driving assembly 140 and release the lock between the target positioning jig 120 and the guide rail 130 when the driving assembly 140 needs to drive the target positioning jig 120 (the so-called target positioning jig 120 is the positioning jig 120 corresponding to the inspected photovoltaic component that needs to be moved by the driving assembly 140) so that the driving assembly 140 can drive the target positioning jig 120 to move, thereby separating the inspected photovoltaic component from the photovoltaic component to be inspected, thereby achieving the purpose of inspecting the next photovoltaic component. When the driving assembly 140 does not need to drive the positioning jig 120 to move, the positioning jig 120 is locked with the guide rail 130 to facilitate the transport of the photovoltaic component by the AGV 110. During use, when the EL detection assembly has completed the inspection of a photovoltaic component, the driving assembly 140 is required to move the photovoltaic component away, thereby moving the inspected photovoltaic component away to facilitate the inspection of the next photovoltaic component.

[0064] During use, AGV110 transports the photovoltaic component to the inspection station and makes the photovoltaic component closest to the front of AGV110 correspond to the EL detection unit 200. Then, under the action of the driving unit 300, the EL detection unit 200 is driven downward from the first working position A to the second working position A, thereby inspecting the above-mentioned photovoltaic component.

[0065] After the inspection is completed, the locking assembly 150 locks the positioning fixture 120 corresponding to the inspected photovoltaic module with the drive assembly 140, and at the same time, releases the lock between the positioning fixture 120 and the guide rail 130. Then, under the action of the drive unit 300, the EL detection unit 200 returns from the second working position A to the first working position A. Then, under the action of the drive assembly 140, it moves a set distance A with the positioning fixture 120 toward the front of the AGV 110. At the same time, the AGV 110 moves forward a set distance B, so that the next photovoltaic module corresponds to the EL detection unit 200. Repeat the above steps until all photovoltaic modules on the AGV 110 are inspected. Then, the AGV 110 leaves with the inspected photovoltaic modules.

[0066] The conveying unit 100 of this structure has a simple structure and a reasonable design. At the same time, by setting the guide rail 130, the drive component 140 and the locking component 150, after the inspection of a photovoltaic component is completed, the above-mentioned inspected photovoltaic component is moved a set distance A through the drive component 140. At the same time, the AGV110 moves forward a set distance B, thereby achieving the purpose of inspecting the next photovoltaic component. There is no need to leave enough distance between any two adjacent positioning fixtures 120 so that the EL detection unit 200 can be inserted between the two adjacent photovoltaic components, which saves space, improves the transportation efficiency of AGV110, and thus improves the inspection efficiency.

[0067] In one embodiment, the driving assembly 140 includes a slider 141 , a lead screw 142 , a nut 143 , and a motor 144 .

[0068] The slider 141 is installed at the bottom of the guide rail 130 and is slidably connected to the AGV110 and the guide rail 130. It can perform reciprocating linear motion along the length direction of the guide rail 130. The screw 142 is rotatably connected to the AGV110. The nut 143 is slidably connected to the AGV110 and fixedly connected to the slider 141. The motor 144 is fixedly installed on the AGV110, and its power output shaft is transmission-connected to the power input end of the screw 142. For example, the power output shaft of the motor 144 is fixedly connected to the power input end of the screw 142, or the power output shaft of the motor 144 is provided with a driving gear, and the power input end of the screw 142 is provided with a driven gear, and the driving gear is meshed with the driven gear. Here, there is no restriction on the structure of the driving gear and the driven gear, and they can be spur gears, helical gears or bevel gears.

[0069] During use, the motor 144 drives the lead screw 142 to rotate forward or reverse, thereby driving the slider 141 to perform reciprocating linear motion through the nut 143. Preferably, the motor 144 is a servo motor 144 or a stepper motor 144.

[0070] The driving assembly 140 of this structure has a simple structure and a reasonable design.

[0071] In one embodiment, the locking assembly 150 includes a first locking socket 151 , a first locking pin 152 , a first elastic member 153 , a second locking socket 154 , a second locking pin 155 , and a driving mechanism.

[0072] The first locking hole 151 is provided on the guide rail 130 and extends along the width direction of the guide rail 130. That is, the length direction of the first locking hole 151 extends along the width direction of the guide rail 130, and the width direction extends along the length direction of the guide rail 130. Specifically, there are multiple first locking holes 151, and the multiple first locking holes 151 are sequentially spaced along the length direction of the guide rail 130.

[0073] The first locking pin 152 is adapted to the first locking socket 151 and is slidably connected to the positioning jig 120. Specifically, a first mounting hole is provided on the positioning jig 120, and the first locking pin 152 is slidably inserted into the first mounting hole. It can perform reciprocating linear motion between a first working position B and a second working position B along the longitudinal direction (i.e., the axial direction of the first mounting hole). When the first locking pin 152 is in the first working position B, the first locking pin 152 retracts into the side wall of the positioning jig 120, thereby allowing the first locking pin 152 to be pulled out of the first locking socket 151 to achieve the purpose of unlocking the positioning jig 120; when the first locking pin 152 is in the second working position B, the first locking pin 152 extends to the outside of the side wall of the positioning jig 120, thereby being inserted into the first locking socket 151 to achieve the purpose of locking the positioning jig 120.

[0074] The first elastic member 153 is mounted above the first locking pin 152. Specifically, the first elastic member 153 is installed in the first mounting hole and located above the first locking pin 152. Its two ends respectively abut the first locking pin 152 and the positioning fixture 120. In its natural state, the first elastic member 153 tends to move the first locking pin 152 from the first working position B to the second working position B. In the present invention, the structure of the first elastic member 153 is not limited in any way. In this embodiment, the first elastic member 153 is a spring.

[0075] Second locking hole 154 is provided on positioning jig 120, and its horizontal projection with first locking hole 151 forms a cross, L-shape, or T-shape. Specifically, first locking hole 151 communicates with the first mounting hole and forms a cross, L-shape, or T-shape with the first mounting hole. This allows second locking pin 155 to be inserted into second locking hole 154, pushing first locking pin 152 into the mounting hole, thereby simultaneously locking positioning jig 120 and drive assembly 140 and releasing the lock between positioning jig 120 and guide rail 130.

[0076] The second locking pin 155 is adapted to the second locking hole 154, which is slidably connected to the slider 141. Specifically, a second mounting hole is opened on the slider 141, and the second locking pin 155 is slidably inserted in the second mounting hole. It can make reciprocating linear motion between the first working position C and the second working position C in the longitudinal direction. When the second locking pin 155 is in the first working position C, the second locking pin 155 retracts into the side wall of the guide rail 130 or the slider 141. Preferably, the second locking pin 155 The fixing pin 155 retracts into the side wall of the guide rail 130 so as to be pulled out from the second locking hole 154, thereby releasing the lock between the drive assembly 140 and the positioning fixture 120; when the second locking pin 155 is in the second working position C, the second locking pin 155 extends to the outside of the side wall of the guide rail 130, so that the second locking pin 155 can be inserted into the second locking hole 154, thereby locking the positioning fixture 120 and the drive assembly 140.

[0077] The driving mechanism is used to drive the second locking pin 155 to perform reciprocating linear motion between the first working position C and the second working position C.

[0078] During use, in a natural state, under the action of the elastic force of the first elastic member 153, the first locking pin 152 is maintained in the second working position B by the first elastic member 153, thereby being inserted into the first locking socket 151, so as to achieve the purpose of locking the positioning jig 120 and the guide rail 130; when the positioning jig 120 needs to be moved, the slider 141 is moved to the bottom of the above-mentioned positioning jig 120, and under the action of the driving mechanism, the second locking pin 155 is driven upward from the first working position C to the second working position C, thereby being inserted into the second locking socket 154, and at the same time, under the action of the second locking pin 155, the first locking pin 152 is pushed from the second working position B to the first working position B, thereby releasing the lock between the positioning jig 120 and the guide rail 130.

[0079] The locking assembly 150 of this structure has a simple structure and a reasonable design. When locking the positioning fixture 120 and the driving assembly 140, the lock between the positioning fixture 120 and the guide rail 130 is released. It is easy to operate and there is no situation where a positioning fixture 120 is locked with the guide rail 130 and the driving assembly 140 at the same time.

[0080] In one embodiment, the driving mechanism includes a permanent magnet 156 , an electromagnet 157 and a second elastic member 158 .

[0081] A permanent magnet 156 is embedded in the bottom end of the second locking pin 155. An electromagnet 157 is mounted below the second locking pin 155 and is fixedly connected to the slider 141. Specifically, the electromagnet 157 is embedded in the bottom of the second mounting hole, and the magnetism of the permanent magnet 156 and the electromagnet 157 on opposite sides is opposite.

[0082] The second elastic member 158 is mounted below the second locking pin 155. Specifically, the second elastic member 158 is mounted within the second mounting hole and positioned below the second locking pin 155. Its two ends abut against the second locking pin 155 and the slider 141, respectively. In its natural state, the second elastic member 158 tends to move the second locking pin 155 from the first working position C to the second working position C. In the present invention, the structure of the second elastic member 158 is not limited in any way. In this embodiment, the second elastic member 158 is a spring.

[0083] During use, when the electromagnet 157 is powered off, under the action of the second elastic member 158, the second locking pin 155 is maintained in the second working position C, thereby being inserted into the second locking socket 154, thereby achieving the purpose of locking the positioning fixture 120 and the drive assembly 140; when the electromagnet 157 is powered on, under the action of the magnetic attraction between the electromagnet 157 and the permanent magnet 156, the second locking pin 155 overcomes the elastic force of the second elastic member 158, thereby moving downward from the second working position C to the first working position C, thereby achieving the purpose of releasing the lock between the positioning fixture 120 and the drive assembly 140.

[0084] The driving mechanism of this structure has a simple structure and a reasonable design.

[0085] In the description of the present invention, a large number of specific details are described. However, it is understood that embodiments of the present invention can be practiced without these specific details. In some instances, well-known methods, structures, and techniques are not shown in detail so as not to obscure the understanding of this description.

[0086] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the above embodiments, or make equivalent replacements for some or all of the technical features therein. These modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present invention, and they should all be included in the scope of the claims and description of the present invention.

Claims

1. A photovoltaic module defect detection system, characterized by: include: A conveying unit, comprising: AGVs; and A positioning jig provided on the AGV and used to position the photovoltaic module is U-shaped, and a positioning groove for positioning the photovoltaic module is provided on its inner side. A plurality of the positioning jigs are sequentially spaced along the length direction of the AGV; An EL detection unit, which is used to detect photovoltaic modules and can move back and forth in a longitudinal direction between a first working position A and a second working position A; and a driving unit, configured to drive the EL detection unit to perform reciprocating linear motion between the first working position A and the second working position A; The conveying unit further includes: A guide rail, which is fixedly connected to the AGV, and the positioning fixture is slidably connected to the guide rail; a drive assembly, which is provided on the AGV and is used to drive the positioning fixture to move along the length direction of the guide rail; and a locking assembly, which is used to lock the target positioning jig with the driving assembly and release the lock between the target positioning jig and the guide rail when the driving assembly needs to drive the target positioning jig to move, and to lock the positioning jig with the guide rail when the driving assembly does not need to drive the positioning jig to move so that the AGV can transport the photovoltaic assembly; The drive assembly includes: A slider, which is arranged at the bottom of the guide rail and is slidably connected to the AGV and the guide rail, and can perform reciprocating linear motion along the length direction of the guide rail; A lead screw, which is rotatably connected to the AGV; A nut, which is slidably connected to the AGV and fixedly connected to the slider; and A motor is provided on the AGV, and a power output shaft thereof is drivingly connected to the power input end of the lead screw; The locking assembly comprises: a first locking socket provided on the guide rail and extending along the width direction of the guide rail; a first locking pin adapted to fit within the first locking socket and slidably connected to the positioning jig, capable of reciprocating linear motion in the longitudinal direction between a first working position B and a second working position B, wherein when the first locking pin is in the first working position B, the first locking pin is retracted into the side wall of the positioning jig, and when the first locking pin is in the second working position B, the first locking pin is extended outside the side wall of the positioning jig; a first elastic member disposed above the first locking pin, with its two ends respectively abutting against the first locking pin and the positioning fixture, and having a tendency to cause the first locking pin to move from the first working position B to the second working position B in a natural state; A second locking socket, which is provided on the positioning jig, and whose projection on the horizontal plane with the first locking socket is a cross, an L or a T shape; a second locking pin adapted to fit within the second locking receptacle, slidably connected to the slider and capable of reciprocating linear motion in the longitudinal direction between a first working position C and a second working position C, wherein when the second locking pin is in the first working position C, the second locking pin is retracted into the guide rail or the side wall of the slider, and when the second locking pin is in the second working position C, the second locking pin is extended beyond the side wall of the guide rail; and A driving mechanism is used to drive the second locking pin to perform reciprocating linear motion between the first working position C and the second working position C.

2. The photovoltaic module defect detection system according to claim 1, characterized in that: The driving mechanism comprises: a permanent magnet embedded in the bottom end of the second locking pin; an electromagnet disposed below the second locking pin, fixedly connected to the slider, wherein the permanent magnet and the electromagnet have opposite magnetic properties on opposite sides; and The second elastic member is arranged below the second locking pin, and its two ends respectively abut against the second locking pin and the slider, and in a natural state, it has a tendency to move the second locking pin from the first working position C to the second working position C.

3. The photovoltaic module defect detection system according to any one of claims 1-2, characterized in that: The driving unit includes an electric push rod, which is fixedly arranged above the EL detection unit. The power output shaft of the electric push rod is fixedly connected to the EL detection unit.

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