Welding spot detection equipment

Abstract

The utility model provides welding spot detection equipment, relates to the field of photovoltaic technology, and aims to solve the technical problem that the reliability of a welding spot between a pole plate led out of a diode in a photovoltaic junction box and a bus bar cannot be effectively detected. The detection equipment comprises an ultrasonic detection part, an instillation part, a sliding rail and a base part arranged on the sliding rail in a sliding manner, the instillation part is arranged on the base part and is used for instilling the ultrasonic propagation medium on a welding spot; the ultrasonic detection part is arranged on the base part and used for conducting ultrasonic detection on the welding spots. The detection equipment disclosed by the utility model can be used for carrying out nondestructive detection on welding spots, and the detection result is high in reliability.

Description

Technical Field

[0001] The utility model relates to the technical field of photovoltaics, in particular to a welding point detection device. Background Art

[0002] The statements in this section merely provide background technology related to the present invention and do not necessarily constitute prior art.

[0003] During the production process of photovoltaic modules, the photovoltaic junction box is set on the back of the photovoltaic module through busbar welding, wherein the busbar is welded to the plate led out of the diode in the photovoltaic junction box. This type of welding is usually shaped with solder, and then the solder shape is detected by imaging to determine the welding effect. In this detection method, when the solder joint between the busbar and the plate is cold-welded, after power is turned on, the high temperature in the cold-welded area will cause the solder shape to melt, and then the junction box will be disconnected and will not work. The photovoltaic cell / string below the high temperature area of ​​the cold-welded area will be damaged, thus affecting the entire photovoltaic module production work. Utility Model Content

[0004] The utility model aims to provide a welding spot detection device to solve the technical problem that the reliability of the welding spot between the plate and the bus bar led out of the diode in the photovoltaic junction box cannot be effectively detected.

[0005] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0006] In a first aspect, the utility model provides a welding point detection device, wherein the welding point is a welding point where a plate of a photovoltaic junction box is connected to a bus bar, and the detection device comprises an ultrasonic detection part, a dripping part, a slide rail, and a base part slidably arranged on the slide rail;

[0007] The dripping part is arranged on the base part, and is used to drip the ultrasonic propagation medium on the welding point;

[0008] The ultrasonic detection part is arranged on the base part, and is used for performing ultrasonic detection on the welding point.

[0009] According to at least one embodiment of the present utility model, the dripping portion includes at least one dripping tube, one end of the at least one dripping tube is connected to the base portion, and the other end is used to drip the ultrasonic propagation medium into the welding point;

[0010] The ultrasonic detection part includes at least one ultrasonic probe and at least one first linear motion mechanism. The fixed end of the at least one first linear motion mechanism is arranged on the base part, and each of the ultrasonic probes is arranged on the first telescopic end of the corresponding first linear motion mechanism.

[0011] According to at least one embodiment of the present utility model, the dripping part further includes a pushing mechanism, and the pushing mechanism is used to provide the ultrasonic propagation medium to the dripping tube.

[0012] According to at least one embodiment of the utility model, the pushing mechanism includes a cylinder, a second linear motion mechanism and a piston adapted to the cylinder, the piston is connected to the second telescopic end of the second linear motion mechanism, and the end of the cylinder away from the second linear motion mechanism is connected to the at least one drip tube; or,

[0013] The pushing mechanism comprises a barrel and a metering pump, and the barrel is connected to the drip tube through the metering pump;

[0014] The cylinder is used to contain the ultrasonic propagation medium.

[0015] According to at least one embodiment of the present utility model, the first linear motion mechanism and / or the second linear motion mechanism respectively include one of a pneumatic cylinder, a hydraulic cylinder or an electric cylinder;

[0016] The metering pump is one of a peristaltic pump, a diaphragm pump, a plunger pump, a syringe pump or a gear pump.

[0017] According to at least one embodiment of the present utility model, the number of the ultrasonic probes is two, and the two ultrasonic probes are spaced apart and distributed along a preset direction; and / or,

[0018] The number of the drip tubes is two, and the two drip tubes are spaced apart and distributed along a preset direction;

[0019] The preset direction refers to: the extending direction of the slide rail.

[0020] According to at least one embodiment of the present utility model, the detection device further comprises a blowing part for clearing the ultrasonic propagation medium on the welding point, and the air outlet of the blowing part faces the welding point.

[0021] According to at least one embodiment of the present utility model, the detection device further includes a conveying mechanism, and the conveying mechanism is used to convey the photovoltaic junction box.

[0022] According to at least one embodiment of the present utility model, the detection device further comprises a casing, a first opening for the photovoltaic junction box to pass through is formed in a portion of the casing close to the rear end of the conveying mechanism, and the blowing part is disposed at the first opening.

[0023] According to at least one embodiment of the utility model, the detection equipment also includes two position sensing devices which are communicatively connected to the conveying mechanism via a controller, a second opening for the photovoltaic junction box to pass through is provided at a portion of the casing close to the head end of the conveying mechanism, and one of the two position sensing devices is arranged at the first opening, and the other is arranged at the second opening.

[0024] Among the one or more technical solutions provided in the exemplary embodiments of the present utility model, at least one of the following beneficial effects can be achieved.

[0025] The solder joint detection device of the exemplary embodiment of the utility model includes an ultrasonic detection part, a dripping part, a slide rail, and a base part slidably arranged on the slide rail. The dripping part first moves to the top of the solder joint through the base part, coats the ultrasonic propagation medium on the solder joint, and then moves the ultrasonic detection part to the top of the solder joint through the movement of the base part. The ultrasonic detection part is attached to the solder joint coated with the ultrasonic propagation medium to detect the welding effect. Since the dripping part and the ultrasonic detection part are both connected to the base part, and the base part is slidably arranged on the slide rail, the repeated positioning of the solder joint by the dripping part and the ultrasonic detection part is more accurate, so that the reliability of the detection result is high. Furthermore, the solder joint detection device uses the dripping part to drip and the ultrasonic detection part to detect solder joint defects. It has a simple structure and low manufacturing cost. Whether there is a defect can be determined by the peak height of the waveform, so that the visibility and reliability of the detection result are achieved. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] The accompanying drawings illustrate exemplary embodiments of the present invention and are used to explain the principles of the present invention together with the description thereof, wherein these drawings are included to provide a further understanding of the present invention, and the accompanying drawings are included in and constitute a part of this specification;

[0027] Figure 1 It is a schematic diagram of the axonometric structure of the detection device according to the embodiment of the utility model;

[0028] Figure 2 It is a structural schematic diagram of a base portion according to an embodiment of the utility model;

[0029] Figure 3 It is a schematic structural diagram of a drip tube and an ultrasonic detection unit according to an embodiment of the utility model;

[0030] Figure 4 It is a structural schematic diagram of a pushing mechanism according to an embodiment of the utility model;

[0031] Figure 5 It is a schematic diagram of the structure of a photovoltaic junction box and an ultrasonic probe according to an embodiment of the utility model;

[0032] Figure 6It is a schematic structural diagram of a blowing part according to an embodiment of the utility model.

[0033] Figure numerals: 11, ultrasonic probe; 12, arm; 13, first linear motion mechanism; 131, fixed end; 132, first telescopic end; 21, drip tube; 22, cylinder; 23, piston; 24, second linear motion mechanism; 241, fixed part; 242, second telescopic end; 30, photovoltaic junction box; 31, welding point; 41, first opening; 42, second opening; 43, position sensing device; 50, slide rail; 51, base; 60, conveying mechanism; 70, blowing part. DETAILED DESCRIPTION

[0034] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0035] The photovoltaic junction box is set on the back of the photovoltaic module through the busbar welding. For example, the two plates of the bypass diode of the photovoltaic junction box are welded to the busbar to form welding points. In the related art, the welding effect detection needs to be energized. When the welding point is cold, high temperature will be generated to make the welding point detached, and the battery cell / string under the hot spot will be damaged, thus affecting the normal operation of the photovoltaic module.

[0036] In view of the above problems, the solder joint detection device provided by the exemplary embodiment of the utility model uses ultrasonic wave to perform non-destructive detection on the solder joint, which can find out whether there are defects in the solder joint and avoid the bad circulation of photovoltaic modules. Figure 5 As shown, Figure 5 It is a schematic diagram of the structure of a photovoltaic junction box and an ultrasonic probe according to an embodiment of the utility model. The welding point 31 is a welding point or solder layer where the pole plate of the photovoltaic junction box 30 is connected to the bus bar. There are two pole plates in the photovoltaic junction box 30, which are respectively connected to the two sides of the bypass diode, and each pole plate forms a welding point 31 with the corresponding bus bar.

[0037] The working principle of ultrasonic detection of solder joints is: when ultrasonic waves propagate in the medium, they have the characteristic of reflection on the interface of different qualities. If a defect is encountered, and the size of the defect is equal to or greater than the wavelength of the ultrasonic wave, the ultrasonic wave will be reflected back on the defect, and the reflected wave can be displayed on the screen. The controller analyzes the data measured by the ultrasonic probe. When the solder joint is good, the reflected wave is a gentle waveform. Whether it is a cold solder joint is determined by the height of the waveform peak tested and the set waveform upper limit.

[0038] Figure 2 It is a structural schematic diagram of a base portion according to an embodiment of the utility model; Figure 3Schematic diagram of the structure of the drip tube and the ultrasonic detection unit according to the embodiment of the utility model. Figure 2 and Figure 3 As shown, the detection equipment provided by the exemplary embodiment of the utility model includes an ultrasonic detection part, a dripping part, a slide rail 50 and a base part 51 slidably arranged on the slide rail 50; the dripping part is arranged on the base part, and is used to drip the ultrasonic propagation medium on the welding point 31; the ultrasonic detection part is arranged on the base part 51, and is used to perform ultrasonic detection on the welding point 31.

[0039] Exemplarily, the dripping part includes at least one dripping tube 21, one end of the at least one dripping tube 21 is connected to the base part 51, and the other end is used to drip the ultrasonic propagation medium on the welding point 31; the ultrasonic detection part includes at least one ultrasonic probe 11 and at least one first linear motion mechanism 13, the fixed end 131 of at least one first linear motion mechanism 13 is arranged on the base part 51, and each ultrasonic probe 11 is arranged at the first telescopic end 132 of the corresponding first linear motion mechanism 13.

[0040] In actual use, when the photovoltaic junction box 30 on the photovoltaic module reaches the detection area, the base part 51 moves along the slide rail 50 under the drive of the driving device until the drip tube 21 is located above the weld 31 to be detected, and the ultrasonic propagation medium required for ultrasonic detection is dripped onto the surface of the weld 31; then the base part 51 continues to move along the slide rail 50 until the ultrasonic probe 11 is located above the weld 31 to be detected. At this time, the first telescopic end 132 of the first linear motion mechanism 13 is extended, and the ultrasonic probe 11 located at the first telescopic end 132 is attached to the weld 31 coated with the ultrasonic propagation medium, and the controller compares the data measured by the ultrasonic probe with the set reflection waveform, and then determines whether the weld 31 has a defect.

[0041] Exemplarily, the ultrasonic probe 11 can be directly arranged on the first telescopic end 132 of the first linear motion mechanism 13, or can be indirectly connected to the first telescopic end 132 of the first linear motion mechanism 13. For example, the first telescopic end 132 and the ultrasonic probe 11 are connected through an arm 12 so that the slide rail 50 has a certain height to facilitate the passage of the photovoltaic module.

[0042] For example, the photovoltaic module has three photovoltaic junction boxes 30 and they are arranged in a straight line. The two welding points 31 in each photovoltaic junction box 30 are also distributed along the straight line. When one of the photovoltaic junction boxes 30 reaches the detection area, that is, below the slide rail 50, the base 51 slides along the slide rail 50 to complete the detection of all welding points 31 on all three photovoltaic junction boxes 30. Based on this, the structure of the welding point detection equipment is relatively simple, and the slide rail 50 can be used to accurately align the drip tube 21, the ultrasonic probe 11 and each welding point 31, thereby improving the detection reliability.

[0043] In order to accurately control the amount of ultrasonic propagation medium required for ultrasonic detection of the weld 31, the detection device provided by the exemplary embodiment of the utility model further includes a pushing mechanism, which controls the amount of ultrasonic propagation medium dripped by the drip tube 21 each time. Exemplarily, the amount pushed by the pushing mechanism is 1ml to 2ml; the ultrasonic propagation medium can be high-resistance pure water, No. 20 to 40 motor oil or carboxymethyl cellulose chemical paste, etc., and the following is explained by taking high-resistance pure water as an example, and the high-resistance pure water can be deionized water, so as to provide a transmission medium for ultrasonic detection.

[0044] There can be many kinds of pushing mechanisms for controlling the amount of water discharged by the drip tube 21 each time.

[0045] For example, the syringe effect is used to control the water output through air pressure. Figure 4 is a schematic diagram of the structure of the push mechanism according to the embodiment of the utility model, such as Figure 4 As shown, the pushing mechanism includes a cylinder 22, a second linear motion mechanism 24 and a piston 23 adapted to the cylinder 22, the piston 23 is connected to the second telescopic end 242 of the second linear motion mechanism 24, and the end of the cylinder 22 away from the second linear motion mechanism 24 is connected to at least one drip tube 21.

[0046] The cylinder 22 is filled with high-resistance pure water, and the second linear motion mechanism 24 includes a fixed portion 241 and a second telescopic end 242. When the second telescopic end 242 is extended, it drives the piston 23 to move in the cylinder 22, thereby changing the air pressure in the cylinder 22, so that the drip tube 21 connected to the cylinder 22 drips a fixed amount of water each time, which can ensure the amount of transmission medium required for ultrasonic detection, and does not produce excessive water, causing a short circuit in the photovoltaic junction box 30. Exemplarily, the cylinder 22 can be arranged outside the housing of the detection device.

[0047] For another example, the pushing mechanism includes a barrel 22 and a metering pump. The barrel 22 is used to contain an ultrasonic propagation medium. The barrel 22 is connected to the drip tube 21 through the metering pump. Exemplarily, the metering pump can be a peristaltic pump, a diaphragm pump, a plunger pump, a syringe pump or a gear pump, which is arranged on the pipeline between the barrel 22 and the drip tube 21, and the drip tube 21 drips a fixed amount of water each time through quantitative pumping.

[0048] In some embodiments, the first linear motion mechanism 13 may be one of a pneumatic cylinder, a hydraulic cylinder or an electric cylinder; the second linear motion mechanism 24 may also be one of a pneumatic cylinder, a hydraulic cylinder or an electric cylinder.

[0049] like Figure 3 and Figure 5As shown, there are two ultrasonic probes 11, and the two ultrasonic probes 11 are spaced apart along a preset direction, and the preset direction refers to: the extension direction of the slide rail 50. Since the photovoltaic junction box 30 has two welding points 31, the two ultrasonic probes 11 correspond to the two welding points 31 respectively, so that the two welding points 31 can be ultrasonically detected at the same time. Exemplarily, the two ultrasonic probes 11 are connected to the first telescopic end 132 of the same first linear motion mechanism 13 through the arm 12; or, the two ultrasonic probes 11 are connected to the first telescopic ends 132 of the two first linear motion mechanisms 13 through the two arm 12.

[0050] Similarly, there are two drip tubes 21, which are spaced apart along a preset direction. When the drip tube 21 moves to the two welding points 31 of the photovoltaic junction box 30, water can be applied to the two welding points 31 at the same time, thereby improving the operation efficiency.

[0051] After the ultrasonic inspection of the welding points 31 of the photovoltaic junction box 30 is completed, the water remaining on the welding points 31 may affect or damage the function of the photovoltaic junction box 30 . Figure 6 Schematic diagram of the structure of the blowing part according to the embodiment of the utility model. Figure 6 As shown, the detection device provided by the exemplary embodiment of the utility model further includes a blowing part 70 for removing the ultrasonic propagation medium on the welding point 31, and the air outlet of the blowing part 70 faces the welding point 31. Exemplarily, the blowing part 70 can be arranged on the base part 51, and the water on the welding point 31 is dried immediately after the detection is completed.

[0052] Figure 1 is a schematic diagram of the axonometric structure of the detection device according to the embodiment of the utility model; Figure 1 As shown, the detection device further includes a conveying mechanism 60 , which is used to transport the photovoltaic junction box 30 , for example, the photovoltaic junction box 30 can be transported to a target area; the target area refers to an area opposite to the slide rail 50 or the ultrasonic probe 11 .

[0053] Exemplarily, the conveying mechanism 60 may include a plurality of rollers sequentially distributed along the detection device from the entrance to the exit. When the rollers rotate, the photovoltaic component is driven by the roller closest to the entrance and gradually approaches the adjacent roller. When it contacts the roller, it gradually approaches the next adjacent roller. After being sequentially conveyed by each roller, the photovoltaic junction box 30 on the photovoltaic component reaches the target area, and continues to be conveyed to the outside of the detection device after the detection is completed. Exemplarily, the conveying mechanism 60 may also convey the photovoltaic component in a manner of a roller-driven conveyor belt. For example, only one roller is provided at the entrance and exit of the detection device, respectively. The conveyor belt is wound around the two rollers. The rotation of the two rollers drives the conveyor belt to rotate, and the photovoltaic component on the conveyor belt moves from the entrance to the exit of the detection device.

[0054] like Figure 6 As shown, the detection device also includes a casing, and a first opening 41 for the photovoltaic junction box 30 to pass through is provided at a portion of the casing near the tail end of the conveying mechanism 60, and a blowing portion 70 is arranged at the first opening 41. Exemplarily, the blowing port of the blowing portion 70 is a long strip-shaped blowing port. When the three photovoltaic junction boxes 30 on the photovoltaic module pass through the first opening 41 driven by the conveying mechanism 60, the blowing portion 70 can dry the water of each welding point 31 at one time. The blowing portion 70 is arranged downstream after the detection is completed and does not affect the detection of the next photovoltaic module, so the production efficiency is relatively high. It should be noted that the two ends of the slide rail 50 are fixed at positions near the top of the two opposite shell walls of the casing.

[0055] like Figure 1 As shown, the detection equipment also includes two position sensing devices 43 which are connected to the conveying mechanism 60 through a controller for communication. A second opening 42 for the photovoltaic junction box 30 to pass through is provided at a portion of the casing near the head end of the conveying mechanism 60. One of the two position sensing devices 43 is provided at the first opening 41, and the other is provided at the second opening 42.

[0056] In actual use, one position sensing device 43 is located at the first opening 41 where the photovoltaic component enters the detection device, and the other position sensing device 43 is located at the second opening 42 where the photovoltaic component enters the detection device. When the position sensing device 43 located at the first opening 41 senses that the photovoltaic component is transmitted to the detection device, the information is transmitted to the controller of the device, and the controller controls the conveying mechanism 60 to operate and transport the photovoltaic component to the target area, that is, below the slide rail 50. At this time, the position sensing device 43 located at the second opening 42 will sense that the photovoltaic junction box 30 is in place, and transmit information to the controller, and the controller controls the conveying mechanism 60 to stop operating. Then the controller controls the drip tube 21 to move above the solder joint 31 of the photovoltaic junction box 30, and applies water on its surface through the pushing mechanism, and then controls the base part 51 to move, and moves the ultrasonic probe 11 above the solder joint 31. When the first telescopic end 132 of the first linear motion mechanism 13 is extended, the ultrasonic probe 11 is driven to fit on the solder joint 31 to detect whether it is a cold solder joint. Exemplarily, the above-mentioned controller can be a computer device or a PLC.

[0057] Those skilled in the art should understand that the above embodiments are only for the purpose of clearly illustrating the present invention, and are not intended to limit the scope of the present invention. For those skilled in the art, other changes or modifications may be made based on the above disclosure, and these changes or modifications are still within the scope of the present invention.

Claims

1. A solder joint detection device, characterized in that: The welding point is a welding point where the pole plate of the photovoltaic junction box is connected to the bus bar, and the detection equipment includes an ultrasonic detection part, a dripping part, a slide rail, and a base part slidably arranged on the slide rail; The dripping part is arranged on the base part, and is used to drip the ultrasonic propagation medium on the welding point; The ultrasonic detection part is arranged on the base part, and is used for performing ultrasonic detection on the welding point.

2. The solder joint detection device according to claim 1, characterized in that: The dripping part comprises at least one dripping tube, one end of the at least one dripping tube is connected to the base part, and the other end is used to drip the ultrasonic propagation medium into the welding point; and / or, The ultrasonic detection part includes at least one ultrasonic probe and at least one first linear motion mechanism. The fixed end of the at least one first linear motion mechanism is arranged on the base part, and each of the ultrasonic probes is arranged on the first telescopic end of the corresponding first linear motion mechanism.

3. The solder joint detection device according to claim 2, characterized in that: The dripping part also includes a pushing mechanism, and the pushing mechanism is used to provide the ultrasonic propagation medium to the dripping tube.

4. The solder joint detection device according to claim 3, characterized in that: The pushing mechanism comprises a cylinder, a second linear motion mechanism and a piston adapted to the cylinder, the piston is connected to the second telescopic end of the second linear motion mechanism, and one end of the cylinder away from the second linear motion mechanism is connected to the at least one drip tube; or, The pushing mechanism comprises a barrel and a metering pump, and the barrel is connected to the drip tube through the metering pump; The cylinder is used to contain the ultrasonic propagation medium.

5. The solder joint detection device according to claim 4, characterized in that: The first linear motion mechanism and / or the second linear motion mechanism respectively include one of a pneumatic cylinder, a hydraulic cylinder or an electric cylinder; The metering pump is one of a peristaltic pump, a diaphragm pump, a plunger pump, a syringe pump or a gear pump.

6. The solder joint detection device according to claim 2, characterized in that: The number of the ultrasonic probes is two, and the two ultrasonic probes are spaced apart along a preset direction; and / or, The number of the drip tubes is two, and the two drip tubes are spaced apart and distributed along a preset direction; The preset direction refers to: the extending direction of the slide rail.

7. The solder joint inspection device according to any one of claims 1 to 6, characterized in that: The detection device further comprises a blowing part for removing the ultrasonic propagation medium on the welding point, and the air outlet of the blowing part faces the welding point.

8. The solder joint inspection device according to claim 7, characterized in that: The detection device further comprises a conveying mechanism, and the conveying mechanism is used for conveying the photovoltaic junction box.

9. The solder joint inspection device according to claim 8, characterized in that: The detection device further comprises a casing, wherein a first opening for the photovoltaic junction box to pass through is formed at a portion of the casing close to the rear end of the conveying mechanism, and the blowing portion is arranged at the first opening.

10. The solder joint inspection device according to claim 9, characterized in that: The detection equipment also includes two position sensing devices which are connected to the conveying mechanism through a controller for communication. A second opening for the photovoltaic junction box to pass through is provided at a portion of the casing close to the head end of the conveying mechanism. One of the two position sensing devices is arranged at the first opening, and the other is arranged at the second opening.

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