Photovoltaic inverter arc fault detection mechanism

Abstract

The application discloses a kind of photovoltaic inverter arc fault detection mechanism, it is related to inverter detection technical field, including inverter body, two electrode terminals are provided on inverter body, still including product transportation unit and fault detection unit, fault detection unit includes detection bracket one and detection bracket two, the lower portion of detection bracket one is provided with two induction cylinders, the outer wall of two induction cylinders is fixedly connected with insulating mounting ring, the middle position of two induction cylinders is provided with arc detector, the two sides of two induction cylinders are provided with control rod, still including two groups of butt joint detection components respectively controlled two induction cylinders butt joint, butt joint detection component includes calibration component, to drive induction cylinder translation calibration calibration, then drive induction cylinder and electrode terminal are butt joint, the electrode terminal on the inverter body of the present application can not matter whether height is consistent, whether it has different electrode spacing, the present detection device can be aligned detection, and the reliability of detection data is higher.

Description

Technical Field

[0001] This invention relates to the field of inverter testing technology, specifically to a photovoltaic inverter arc fault detection mechanism. Background Technology

[0002] A photovoltaic inverter is a power conversion device based on semiconductor devices. Its core function is to convert the variable DC voltage generated by photovoltaic solar panels into AC power that conforms to the mains frequency. The converted power can be fed into the commercial grid or used by off-grid systems. A typical photovoltaic inverter consists of a boost circuit and an inverter bridge circuit. It is one of the key system balancing components in a photovoltaic power generation system, and its performance quality is directly related to the stability of the entire photovoltaic array system.

[0003] Photovoltaic inverters typically have two electrodes, and the distance between them is called the electrode spacing. Currently, the common method for detecting arc faults in photovoltaic inverters is to connect them to a dedicated arc detector. The detector analyzes the feedback voltage or current signals to diagnose the fault in the inverter. However, most existing detection devices use a simple downward-facing connection structure. The problem is that during the production process of photovoltaic inverters, it is difficult to ensure that the heights of the two electrode terminals at the top are completely consistent, and height deviations often exist. In addition, the electrode spacing varies between different inverter models. These factors require operators to frequently adjust the relative position of the detection device and the inverter to obtain effective detection signals. This not only significantly reduces detection efficiency and is not conducive to continuous detection operations, but may also lead to deviations in the detection data of the same batch of inverters. Therefore, existing arc fault detection devices still need improvement in terms of applicability and detection efficiency. Summary of the Invention

[0004] The purpose of this invention is to provide a photovoltaic inverter arc fault detection mechanism, which solves the problems mentioned in the background art.

[0005] To achieve the above objectives, the present invention provides a photovoltaic inverter arc fault detection mechanism, comprising an inverter body with two electrode terminals, a product transport unit and a fault detection unit, the fault detection unit comprising a detection bracket one and a detection bracket two, two induction cylinders being disposed below the detection bracket one, each induction cylinder having an induction pad disposed below it, an insulating mounting ring being fixedly connected to the outer wall of each induction cylinder, an arc detector being disposed in the middle of the two induction cylinders, and control rods being disposed on both sides of each induction cylinder, and two sets of docking detection components for controlling the docking of the two induction cylinders respectively;

[0006] The docking detection component includes a calibration component, two sets of tight-fitting components, and a pre-treatment component. The calibration component moves the induction cylinder for translation calibration via a control rod, and then drives the induction cylinder to move down and dock with the electrode terminals. The two sets of tight-fitting components are respectively located on both sides of the induction cylinder. When the two induction cylinders move down and are in contact with the electrode terminals, two insulating mounting rings apply equal pre-stress external force to the two induction cylinders respectively. The pre-treatment component is located below the second detection bracket to perform self-cleaning in advance before the inverter body undergoes fault detection.

[0007] Optionally, the inner wall of the first detection bracket has two sliding grooves, and the walls of the two sliding grooves are slidably connected to the first detection plate. The inner wall of the first detection plate has two through grooves, and the walls of the two through grooves are slidably connected to through shafts. It also includes a first drive assembly, which includes two motors fixedly connected to the surface of the first detection bracket. The output ends of the two motors are fixedly connected to threaded rods. The arms of the two threaded rods are threadedly connected to the inner wall of the first detection plate, and the ends of the two threaded rods are rotatably connected to the surface of the first detection bracket.

[0008] Optionally, the calibration component includes:

[0009] A sliding sleeve is slidably connected to the outer wall of the detection plate. The sliding sleeve is fixedly connected to the bottom surface of the sliding sleeve. The sensing cylinder is slidably connected to the inner wall of the sliding sleeve. An electric wire is fixedly connected to the top surface of the sensing cylinder. The electric wire passes through the sliding sleeve and the inside of the sliding sleeve and is connected to the arc detector. The arc detector is fixedly connected to the bottom surface of the detection plate. An adjustment groove is opened on the surface of the detection plate for the adjustment rod to slide. The adjustment rod is vertically slidably connected to the surface of the sliding sleeve.

[0010] Optionally, the calibration component includes:

[0011] A pressing rod is slidably connected to the inner wall of the control rod. The top surface of the detection bracket is provided with a mounting groove that is slidably connected to the control rod. Several insertion ports are provided on both sides of the inner wall of the mounting groove. An adjusting spring is sleeved on the arm of the pressing rod. The two ends of the adjusting spring are respectively fixedly connected to the arm of the pressing rod and the inner wall of the control rod. Two hinged rods are hinged to the end of the pressing rod. Each of the two hinged rods is hinged to an insertion block. Both insertion blocks are adapted to the insertion ports. Both insertion blocks are slidably connected to the inner wall of the control rod.

[0012] A trigger block is slidably connected to the end of the control rod away from the pressing rod. A trigger spring is fixedly connected to the trigger block and the inner wall of the control rod. A trigger switch is fixedly connected to the inner wall of the control rod. A start button for controlling the motor is provided on the top surface of the second detection bracket. The signal receiving element of the trigger switch is connected in series in the connection line between the start button and the motor.

[0013] Optionally, the close-fitting component includes:

[0014] A transmission rod is slidably connected to the inner wall of the detection plate and the sliding sleeve. The end of the transmission rod is slidably connected to the shaft arm of the through shaft. A pressing block is fixedly connected to the surface of the transmission rod. A transmission block is fixedly connected to the side wall of the sensing cylinder. A vertical groove is provided on the side wall of the sliding sleeve for the transmission block to pass through. A U-shaped block is fixedly connected to the surface of the transmission block. A transverse groove is provided on the inner wall of the U-shaped block. A fixed shaft is slidably connected to the groove wall of the transverse groove. A rod is rotatably connected to the shaft arm of the fixed shaft. A rod is slidably connected to the outer wall of the rod. The end of the rod is connected to the inner wall of the rod through a stress spring. The rod is hinged to the inner wall of the insulating mounting ring. A pressing block is fixedly connected to the shaft arm of the fixed shaft. A turning groove is provided on the side wall of the detection bracket. The through shaft is slidably connected to the groove wall of the turning groove.

[0015] Optionally, the product transport unit includes:

[0016] The mounting base is equipped with a drive unit and an electrical control box. A conveyor belt is mounted on the mounting base. The drive unit is used to control the intermittent conveying of the conveyor belt. Both the first detection bracket and the second detection bracket are bolted to the surface of the mounting base.

[0017] Optionally, the preprocessing component includes:

[0018] The detection plate two is slidably connected to the inner wall of the detection bracket two. The detection plate two is controlled by the second drive assembly, which is the same as the first drive assembly. Two mating sleeves are slidably connected to the surface of the detection plate two. Hollow dust collectors are fixedly connected to the bottom surface of the two mating sleeves. A control device for driving the two hollow dust collectors is provided on the bottom surface of the detection plate two. The two mating sleeves and the two sliding sleeves are connected by a synchronous rod.

[0019] Optionally, both control rods are rotatably connected to a first linkage rod, and the ends of the two first linkage rods are hinged to a second linkage rod. The arm of the second linkage rod is rotatably connected to the top surface of the first detection bracket.

[0020] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0021] I. Regardless of whether the electrode terminals on the inverter body are at the same height or have different electrode spacing, this detection device can perform alignment detection, and the reliability of the detection data is high.

[0022] As can be seen from the above, this device can only be lowered for circuit docking after the induction cylinder and electrode terminals are aligned. This also has the effect of forced calibration, preventing situations where alignment is forgotten or not fully aligned before docking and testing, thus further improving the reliability of the test data.

[0023] Second, the present invention first makes the surface of the sensing cylinder and the electrode terminal adhere together, and then applies additional prestress to the sensing cylinder to make the sensing cylinder and the electrode terminal adhere tightly. In this way, the sensing cylinder has downward pressure, which enables the sensing cylinder to make stable contact with the electrode terminal, and further ensures the accuracy of the detection data.

[0024] Meanwhile, since both induction cylinders are slidably connected inside the sliding sleeve, the pressure on the top surface of the two electrode terminals will always be consistent regardless of whether the two electrode terminals are uneven. This balances the applied external force, avoids affecting the installation stability of the electrode terminals on the inverter body, fundamentally avoids the possibility of deformation of the electrode terminals during the test of the inverter body, and the test data is less likely to deviate, which is beneficial for the tester to record.

[0025] Third, through the synchronous downward movement of the hollow dust collector and the induction cylinder, the inverter body can be covered by the hollow dust collector before being tested, blowing away the dust on the electrode terminals and ensuring that the induction cylinder can be electrically connected to the electrode terminals. Furthermore, through the guiding setting of linkage rod one and linkage rod two, the operator can move more smoothly and operate more conveniently when adjusting the two control rods simultaneously. Attached Figure Description

[0026] Figure 1 This is an isometric view of the present invention;

[0027] Figure 2 This is an isometric view of the fault detection unit of the present invention;

[0028] Figure 3 This is a diagram showing the positional relationship between the two hollow dust collectors of this invention;

[0029] Figure 4 This is an isometric view of the detection bracket and its connecting parts according to the present invention;

[0030] Figure 5 This is an exploded view of the connection between the detection plate and the detection bracket of the present invention.

[0031] Figure 6For the present invention Figure 5 Enlarged view of the structure at point A in the middle;

[0032] Figure 7 This is a planar sectional view of the connection between the control rod and the trigger block of the present invention;

[0033] Figure 8 This is a schematic diagram showing the position of the through shaft and the detection plate of the present invention.

[0034] Figure 9 For the present invention Figure 8 Enlarged view of the structure at point B;

[0035] Figure 10 This is a schematic diagram showing the connection between the through shaft and the transmission rod of the present invention;

[0036] Figure 11 This is a schematic diagram of the connection between rod one and rod two of the present invention;

[0037] Figure 12 This is a schematic diagram of the internal structure of the control lever of the present invention.

[0038] In the diagram: 101. Inverter body; 102. Drive assembly 1; 103. Drive assembly 2; 111. Product transport unit; 222. Fault detection unit; 1. Detection bracket 1; 2. Detection bracket 2; 3. Induction cylinder; 4. Insulating mounting ring; 5. Arc detector; 6. Control rod; 7. Slide groove; 8. Detection plate 1; 9. Through groove; 10. Through shaft; 11. Motor; 12. Threaded rod; 13. Sliding sleeve; 14. Sliding sleeve; 15. Wire; 16. Pressing rod; 17. Adjusting spring; 18. Hinge rod; 9. Insert block; 20. Trigger block; 21. Trigger spring; 22. Trigger switch; 23. Transmission rod; 24. Extrusion block one; 25. Transmission block; 26. U-shaped block; 27. Transverse groove; 28. Fixed shaft; 29. ​​Rod one; 30. Rod two; 31. Stress spring; 32. Extrusion block two; 33. Turning groove; 34. Mounting base; 35. Drive unit; 36. Electrical control box; 37. Conveyor belt; 38. Detection plate two; 39. Mating sleeve; 40. Hollow dust collector; 41. Synchronizing rod; 42. Linkage rod one; 43. Linkage rod two. Detailed Implementation

[0039] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0040] Example 1, please refer to Figures 1 to 12This invention provides a photovoltaic inverter arc fault detection mechanism, including an inverter body 101 with two electrode terminals, a product transport unit 111, and a fault detection unit 222. The product transport unit 111 includes a mounting frame 34, a drive unit 35, and an electrical control box 36. A conveyor belt 37 is mounted on the mounting frame 34. The drive unit 35 controls the intermittent transport of the conveyor belt 37. Detection bracket 1 and detection bracket 2 are both bolted to the surface of the mounting frame 34. The fault detection unit 222 includes detection bracket 1 and detection bracket 2. When the inspector starts working, the drive unit 35 can be activated through the electrical control box 36, thereby causing the inverter body 101, which is placed at equal intervals on the conveyor belt 37, to be transported intermittently. This causes the inverter body 101 to first be located below detection bracket 2 and then transferred to be below detection bracket 1.

[0041] The testing bracket 1 has two induction cylinders 3 below it, each with an induction pad below it. Insulating mounting rings 4 are fixedly connected to the outer walls of the two induction cylinders 3. An arc detector 5 is located in the middle of the two induction cylinders 3. Adjustment rods 6 are located on both sides of the two induction cylinders 3. The bracket also includes two sets of docking detection components that control the docking of the two induction cylinders 3 respectively.

[0042] The docking detection component includes a calibration component, two sets of tightly fitting components, and a pre-treatment component located below the second detection bracket 2. The calibration component drives the induction cylinder 3 to perform translational calibration via the control rod 6, and then drives the induction cylinder 3 to move down and dock with the electrode terminals. The two sets of tightly fitting components are respectively located on both sides of the induction cylinder 3, so that when the two induction cylinders 3 move down and both contact the electrode terminals, the two insulating mounting rings 4 apply equal pre-stress external force to the two induction cylinders 3 respectively. The setting of the pre-treatment component enables the inverter body 101 to perform self-cleaning before accepting fault detection.

[0043] Furthermore, the inner wall of the detection bracket 1 has two sliding grooves 7, and the walls of the two sliding grooves 7 are slidably connected to the detection plate 8. The inner wall of the detection plate 8 has two through grooves 9, and the walls of the two through grooves 9 are slidably connected to through shafts 10. It also includes a first drive assembly 102, which includes two motors 11 fixedly connected to the surface of the detection bracket 1. The output ends of the two motors 11 are fixedly connected to threaded rods 12. The arms of the two threaded rods 12 are threadedly connected to the inner wall of the detection plate 8, and the ends of the two threaded rods 12 are rotatably connected to the surface of the detection bracket 1.

[0044] The calibration components include a sliding sleeve 13, a sliding sleeve 14 slidably connected to the outer wall of the detection plate 8, a fixed connection between the sliding sleeve 13 and the bottom surface of the sliding sleeve 14, a sliding connection between the sensing cylinder 3 and the inner wall of the sliding sleeve 13, and a fixed connection between the top surface of the sensing cylinder 3 and a wire 15. The wire 15 passes through the sliding sleeve 13 and the sliding sleeve 14 and is connected to the arc detector 5. The arc detector 5 is fixedly connected to the bottom surface of the detection plate 8. An adjustment groove is provided on the surface of the detection plate 8 for the adjustment rod 6 to slide. The adjustment rod 6 is vertically slidably connected to the surface of the sliding sleeve 14.

[0045] The pressing rod 16 is slidably connected to the inner wall of the control rod 6. The top surface of the detection bracket 1 has a mounting groove that is slidably connected to the control rod 6. Several insertion ports are provided on both sides of the inner wall of the mounting groove. An adjusting spring 17 is sleeved on the arm of the pressing rod 16. The two ends of the adjusting spring 17 are fixedly connected to the arm of the pressing rod 16 and the inner wall of the control rod 6, respectively. Two hinged rods 18 are hinged to the end of the pressing rod 16. Insert blocks 19 are hinged to the end of each of the two hinged rods 18. Both insert blocks 19 are adapted to the insertion ports and are slidably connected to the inner wall of the control rod 6.

[0046] A trigger block 20 is slidably connected to the end of the control lever 6 away from the pressing lever 16. A trigger spring 21 is fixedly connected to the trigger block 20 and the inner wall of the control lever 6. A trigger switch 22 is fixedly connected to the inner wall of the control lever 6. A start button for controlling the start of the motor 11 is provided on the top surface of the detection bracket 2. The signal receiving element of the trigger switch 22 is connected in series in the connection line between the start button and the motor 11.

[0047] More specifically, in this embodiment, when the inverter body 101 to be tested is located below the test bracket 1, the tester can first move the two control levers 6. Taking the movement of one control lever 6 as an example, the same principle applies to both. The tester holds the control lever 6 with their thumb positioned at the end of the pressing lever 16 and presses the pressing lever 16, causing the pressing lever 16 to slide down along the inner wall of the control lever 6. This compresses the adjusting spring 17. Under the movement of the pressing lever 16, the two hinged rods 18 pull the plugs 19 on both sides out of the plugs on both sides. This allows the control lever 6 to slide along the mounting groove on the inner wall of the test bracket 1. Moving the control lever 6 will simultaneously drive the sliding sleeve 14 to slide along the surface of the test plate 8, thereby causing the sliding sleeve 13, the induction cylinder 3, and its components to move synchronously. In this way, the horizontal position of the induction cylinder 3 can be adjusted first.

[0048] During the adjustment process, as the control lever 6 moves closer to the electrode terminals on the inverter body 101, the trigger block 20 below continuously moves closer to the electrode terminals. When the two contact, the subsequent displacement of the control lever 6 will push the trigger block 20 into the control lever 6 through the electrode terminals, making it contact the trigger switch 22, thus ensuring the connection between the start button and the motor 11 is unobstructed. After the adjustment is completed, the inspector releases the pressing lever 16 with their thumb. Under the reset action of the adjusting spring 17, the two inserts 19 are reinserted into the sockets on both sides, locking the position of the control lever 6 and keeping the position of the adjusted induction cylinder 3 unchanged. This allows for adaptation to different types and spacings of electrode terminals, improving the applicability of the device.

[0049] At this time, the motor 11 can be started, which will drive the threaded rod 12 to rotate, thereby causing the detection plate 8 to move vertically downward. During the downward movement, the sliding sleeve 14 and the connected components will move downward synchronously. At this time, the two sensing cylinders 3 will move downward synchronously. If the two electrode terminals on the inverter body 101 are uneven, one of the sensing cylinders 3 will contact the electrode terminal first. As it continues to move downward, when the other electrode terminal contacts the sensing cylinder 3, the sensing cylinder 3 that contacts first will be pushed and slide along the inner wall of the sliding sleeve 13.

[0050] In this way, regardless of whether the electrode terminals on the inverter body 101 are at the same height or have different electrode spacing, this detection device can perform targeted alignment detection, thus ensuring the reliability of the detection data. At the same time, as mentioned above, when horizontal alignment is achieved, the connection line of the motor 11 is unobstructed. Therefore, this device can also achieve the effect of forced calibration. Compared with some common methods in the industry today, this approach will not result in forgetting to align or starting alignment detection before complete alignment, further ensuring the reliability of the detection data.

[0051] Example 2, based on the above examples:

[0052] Please see Figures 4 to 12The tightly fitting components include a transmission rod 23, which is slidably connected to the detection plate 8 and the inner wall of the sliding sleeve 14. The end of the transmission rod 23 is slidably connected to the shaft arm of the through shaft 10. A pressing block 24 is fixedly connected to the surface of the transmission rod 23. A transmission block 25 is fixedly connected to the side wall of the sensing cylinder 3. A vertical groove is provided on the side wall of the sliding sleeve 13 for the transmission block 25 to pass through. A U-shaped block 26 is fixedly connected to the surface of the transmission block 25. A transverse groove is provided on the inner wall of the U-shaped block 26. 27. A fixed shaft 28 is slidably connected to the wall of the transverse groove 27. A rod 29 is rotatably connected to the shaft arm of the fixed shaft 28. A rod 30 is slidably connected to the outer wall of the rod 29. The end of the rod 29 is connected to the inner wall of the rod 30 through a stress spring 31. The rod 30 is hinged to the inner wall of the insulating mounting ring 4. A pressing block 32 is fixedly connected to the shaft arm of the fixed shaft 28. A turning groove 33 is opened on the side wall of the detection bracket 1. The through shaft 10 is slidably connected to the wall of the turning groove 33.

[0053] More specifically, in this embodiment, during the downward movement of the aforementioned detection plate 8, the sliding sleeve 14 and the through groove 9 simultaneously drive the two through shafts 10 to move downward. Taking a single through shaft 10 as an example, the other one works similarly. During the downward movement of the through shaft 10, it will slide downward along the inner wall of the turning groove 33, such as... Figure 5 As shown, when the shaft 10 moves to the turning point at the lower end of the turning groove 33, it moves along the inner wall of the turning groove 9 during the downward movement. This will drive the transmission rod 23 to move synchronously, causing the first extrusion block 24 to move closer to the induction cylinder 3. At this time, the second extrusion block 32 will push the fixed shaft 28 to slide along the groove wall of the transverse groove 27, causing the first rod 29 and the second rod 30 to deflect. This will cause the stress spring 31 in the second rod 30 to be compressed, thus generating a downward thrust on the insulating mounting ring 4. This will cause the induction cylinder 3 to be in close contact with the surface of the electrode terminal through the insulating mounting ring 4.

[0054] After the contact is completed, the arc detector 5 is activated. The signal detected at the contact point between the electrode terminal and the induction cylinder 3 is transmitted to the arc detector 5 through the wire 15. The arc detector 5 determines whether the current voltage or current signal exceeds the threshold, thereby determining whether there is a fault in the inverter body 101. If there is a fault, the inverter body 101 can be removed. If the detection is normal, no additional processing is required, and it continues to be conveyed forward along the conveyor belt 37.

[0055] By ensuring that the sensor cylinder 3 is in close contact with the surface of the electrode terminal, the accuracy of the test data can be further ensured. Compared with the existing method, since both sensor cylinders 3 are slidably connected in the sliding sleeve 13, the pressure on the top surface of the two electrode terminals will always be consistent, regardless of whether the two electrode terminals are uneven. This balances the applied external force, avoids affecting the installation stability of the electrode terminals on the inverter body 101, and the test data is less likely to deviate, which is beneficial for the tester to record.

[0056] Example 3, based on the above examples:

[0057] Please see Figures 2 to 4 The pretreatment component includes a detection plate 38 slidably connected to the inner wall of the detection bracket 2. The detection plate 38 is controlled by a second drive assembly 103, which is identical to the first drive assembly 102. Two mating sleeves 39 are slidably connected to the surface of the detection plate 38. Hollow dust collectors 40 are fixedly connected to the bottom surfaces of the two mating sleeves 39. A control device for driving the two hollow dust collectors 40 is provided on the bottom surface of the detection plate 38. The two mating sleeves 39 are connected to the two sliding sleeves 14 by a synchronizing rod 41. During the forward conveying of the inverter body 101 on the conveyor belt 37, it is first located below the detection bracket 2, and then located below... Below the detection bracket 1, the two sliding sleeves 14 are adjusted through the above process to adapt the two sensing cylinders 3 to the electrode spacing. During this process, the transmission of the synchronous rod 41 will cause the two mating sleeves 39 to move synchronously. This allows the two hollow dust collectors 40 to also adapt to the electrode spacing. The first drive assembly 102 and the second drive assembly 103 can be started synchronously, causing the detection plate 2 38 to drive the two hollow dust collectors 40 to move down, cover the two electrode terminals, and perform dust removal. This achieves a self-cleaning process before detection, blowing away the dust on the electrode terminals and ensuring that the sensing cylinder 3 can be electrically connected to the electrode terminals.

[0058] Both control levers 6 are rotatably connected to linkage lever 42, and the ends of the two linkage levers 42 are hinged to linkage lever 43. The arm of linkage lever 43 is rotatably connected to the top surface of the detection bracket 1.

[0059] More specifically, in this embodiment, the guiding arrangement of linkage rod 1 42 and linkage rod 2 43 makes it easier for the inspector to move the two control rods 6 simultaneously, and the operation is more convenient.

[0060] Working principle: When using this photovoltaic inverter arc fault detection mechanism, the inspector can start the drive unit 35 through the electrical control box 36, which will cause the inverter body 101, which is placed at equal intervals on the conveyor belt 37, to be intermittently transported. The inverter body 101 is first located below the second detection bracket 2, and then transferred to the lower part of the first detection bracket 1. When it is below the second detection bracket 2, the second drive component 103 drives the two hollow dust collectors 40 to move down, first covering the two electrode terminals, and then blowing away the dust on the electrode terminals to ensure that the induction cylinder 3 can be electrically connected to the electrode terminals.

[0061] Subsequently, the conveyor belt 37 moves the self-cleaned inverter body 101 to below the test bracket 1. At this time, the inspector can first move the two control rods 6, which simultaneously move the sliding sleeve 14 along the surface of the test plate 8, thereby causing the sliding sleeve 13, the induction cylinder 3, and its components to move synchronously, thus adjusting the horizontal position of the induction cylinder 3. During the adjustment process, that is, as the control rods 6 move closer to the electrode terminals on the inverter body 101, the trigger block 20 below continuously moves closer to the electrode terminals. When the two make contact, the position of the control rods 6 is then adjusted. The electrode terminals are moved to push the trigger block 20 into the control lever 6, so that the connection between the start button and the motor 11 is unobstructed. After the adjustment is completed, the tester releases the pressing lever 16 with his thumb. Under the reset action of the adjusting spring 17, the two plugs 19 are inserted into the plugs on both sides again, so that the position of the control lever 6 is locked, thereby keeping the position of the adjusted induction cylinder 3 unchanged. In this way, it can adapt to different models and different spacing of electrode terminals. After the adjustment is completed, the two electrode terminals on the inverter body 101 are located below the two induction cylinders 3.

[0062] Then, by pressing the start button, the motor 11 is driven to move the two induction cylinders 3 downwards synchronously. If the two electrode terminals on the inverter body 101 are uneven, one of the induction cylinders 3 will contact the electrode terminal first. As it continues to move downwards, the induction cylinder 3 that contacts the other electrode terminal will be pushed and slide along the inner wall of the sliding sleeve 13. In this way, regardless of whether the electrode terminals on the inverter body 101 are at the same height or have different electrode spacing, this detection device can perform targeted alignment detection, thus ensuring the reliability of the detection data.

[0063] During the downward movement of the two induction cylinders 3, the two through shafts 10 move synchronously downward. When they reach the turning point at the lower end of the turning groove 33, the compression block 24 moves closer to the induction cylinder 3, thereby compressing the stress spring 31 inside the rod 2 30. The rod 29 and the rod 30 together form a downward tilting state, which will generate a downward thrust on the insulating mounting ring 4. The insulating mounting ring 4 makes the surface of the induction cylinder 3 and the electrode terminal fit tightly together. After the fit is complete, the arc detector 5 is activated. The signal detected at the contact point between the electrode terminal and the induction cylinder 3 is transmitted to the arc detector 5 through the wire 15. The arc detector 5 determines whether the current voltage or current signal exceeds the threshold, thereby determining whether there is a fault in the inverter body 101. If there is a fault, the inverter body 101 can be removed. If the test is normal, no additional processing is required. It can continue to be conveyed forward along the conveyor belt 37. The next self-cleaned inverter body 101 is located below the test bracket 1 again and is tested by this device.

[0064] Although embodiments of the 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 invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A photovoltaic inverter arc fault detection mechanism, comprising an inverter body (101), wherein two electrode terminals are disposed on the inverter body (101), characterized in that: It also includes a product transport unit (111) and a fault detection unit (222). The fault detection unit (222) includes a first detection bracket (1) and a second detection bracket (2). Two induction cylinders (3) are arranged below the first detection bracket (1). Induction pads are arranged below the two induction cylinders (3). Insulating mounting rings (4) are fixedly connected to the outer walls of the two induction cylinders (3). An arc detector (5) is arranged in the middle of the two induction cylinders (3). Adjustment rods (6) are arranged on both sides of the two induction cylinders (3). It also includes two sets of docking detection components that control the docking of the two induction cylinders (3) respectively. The docking detection component includes: The calibration component is used to drive the induction cylinder (3) to perform translation calibration via the control rod (6), and then drive the induction cylinder (3) to move down to dock with the electrode terminal; Two sets of tightly fitting components are respectively arranged on both sides of the induction cylinder (3) so that when the two induction cylinders (3) move down and both contact the electrode terminals, the two insulating mounting rings (4) apply equal prestressing external force to the two induction cylinders (3) respectively. A pretreatment component is provided below the second detection bracket (2); The inner wall of the detection bracket (1) has two sliding grooves (7), and the walls of the two sliding grooves (7) are slidably connected to the detection plate (8). It also includes a first drive assembly (102), which includes two motors (11) fixedly connected to the surface of the detection bracket (1). The calibration component includes a sliding sleeve (13) and a pressing rod (16). The outer wall of the detection plate (8) is slidably connected to a sliding sleeve (14). The sliding sleeve (13) is fixedly connected to the bottom surface of the sliding sleeve (14). The sensing cylinder (3) is slidably connected to the inner wall of the sliding sleeve (13). The top surface of the sensing cylinder (3) is fixedly connected to a wire (15). The wire (15) passes through the sliding sleeve (13) and the sliding sleeve (14) and is connected to the arc detector (5). The arc detector (5) is fixedly connected to the bottom surface of the detection plate (8). The surface of the detection plate (8) is provided with an adjustment groove for the control rod (6) to slide. The control rod (6) is vertically slidably connected to the surface of the sliding sleeve (14). The pressing rod (16) is slidably connected to the inner wall of the control rod (6). The top surface of the detection bracket (1) is provided with an installation groove that is slidably connected to the control rod (6). Several insertion ports are provided on both sides of the inner wall of the installation groove. An adjusting spring (17) is sleeved on the arm of the pressing rod (16). The two ends of the adjusting spring (17) are fixedly connected to the arm of the pressing rod (16) and the inner wall of the control rod (6), respectively. Two hinged rods (18) are hinged to the end of the pressing rod (16). Inserts (19) are hinged to the ends of the two hinged rods (18). The two inserts (19) are adapted to the insertion ports. The two inserts (19) are slidably connected to the inner wall of the control rod (6). The end of the control rod (6) away from the pressing rod (16) is slidably connected to a trigger block (20). The trigger block (20) and the inner wall of the control rod (6) are fixedly connected to a trigger spring (21). The inner wall of the control rod (6) is fixedly connected to a trigger switch (22). The top surface of the detection bracket (2) is provided with a start button to control the start of the motor (11). The signal receiving element of the trigger switch (22) is connected in series on the connection line between the start button and the motor (11).

2. The photovoltaic inverter arc fault detection mechanism according to claim 1, characterized in that: The inner wall of the detection plate (8) has two through grooves (9), and the walls of the two through grooves (9) are slidably connected to through shafts (10). The output ends of the two motors (11) are fixedly connected with threaded rods (12), the arms of the two threaded rods (12) are threadedly connected to the inner wall of the detection plate (8), and the ends of the two threaded rods (12) are rotatably connected to the surface of the detection bracket (1).

3. The photovoltaic inverter arc fault detection mechanism according to claim 2, characterized in that: The tightly fitting component includes: The transmission rod (23) is slidably connected to the inner wall of the detection plate (8) and the sliding sleeve (14). The end of the transmission rod (23) is slidably connected to the shaft arm of the through shaft (10). A pressing block (24) is fixedly connected to the surface of the transmission rod (23). A transmission block (25) is fixedly connected to the side wall of the sensing cylinder (3). A vertical groove for the transmission block (25) to pass through is opened on the side wall of the sliding sleeve (13). A U-shaped block (26) is fixedly connected to the surface of the transmission block (25). A transverse groove (27) is opened on the inner wall of the U-shaped block (26). A fixed shaft (28) is slidably connected to the wall of the groove (27). A rod (29) is rotatably connected to the shaft arm of the fixed shaft (28). A rod (30) is slidably connected to the outer wall of the rod (29). The end of the rod (29) is connected to the inner wall of the rod (30) through a stress spring (31). The rod (30) is hinged to the inner wall of the insulating mounting ring (4). A pressing block (32) is fixedly connected to the shaft arm of the fixed shaft (28). A turning groove (33) is opened on the side wall of the detection bracket (1). The through shaft (10) is slidably connected to the wall of the turning groove (33).

4. The photovoltaic inverter arc fault detection mechanism according to claim 3, characterized in that: The product transport unit (111) includes: Mounting base (34), on which a drive unit (35) and an electrical control box (36) are provided, and on which a conveyor belt (37) is provided, the drive unit (35) is used to control the intermittent conveying of the conveyor belt (37), and the first detection bracket (1) and the second detection bracket (2) are both mounted on the surface of the mounting base (34) by bolts.

5. The photovoltaic inverter arc fault detection mechanism according to claim 4, characterized in that: The pretreatment component includes: The detection plate 2 (38) is slidably connected to the inner wall of the detection bracket 2 (2). The detection plate 2 (38) is controlled by the second drive assembly (103) which is consistent with the first drive assembly (102). The surface of the detection plate 2 (38) is slidably connected to two mating sleeves (39). The bottom surface of the two mating sleeves (39) is fixedly connected to a hollow dust collector (40). The bottom surface of the detection plate 2 (38) is provided with a control device for driving the two hollow dust collectors (40). The two mating sleeves (39) and the two sliding sleeves (14) are connected by a synchronizing rod (41).

6. The photovoltaic inverter arc fault detection mechanism according to any one of claims 2-5, characterized in that: Both control rods (6) are rotatably connected to linkage rod one (42), and the ends of the two linkage rods one (42) are hinged together to linkage rod two (43). The arm of linkage rod two (43) is rotatably connected to the top surface of the detection bracket one (1).

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