Defect detection equipment for solar cell

Abstract

The invention relates to the technical field of solar cell detection, and discloses a solar cell defect detection device which comprises a detection platform, a conveying mechanism and a positioning mechanism. The conveying mechanism comprises a feeding belt and a discharging belt which are arranged at the two ends of the detection platform respectively; the positioning mechanism comprises a suspension frame arranged on the side, close to the ground, of the detection platform, an air column is arranged on the suspension frame and located under the detection camera, a piston is slidably connected to the interior of the air column, an air guide pipe synchronously moving along with the piston is slidably connected to the upper end of the air column, and an air guide seat is arranged at the end, close to the detection camera, of the air guide pipe; a suction cup communicated with the air guide pipe is arranged on the surface of the air guide seat. According to the invention, through the synergistic effect of the L-shaped positioning seat and the air guide seat, the two-dimensional plane positioning of the battery piece is automatically completed by using the L-shaped structure in the vertical lifting process of the air guide seat.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of solar cell detection, and particularly relates to a defect detection device for a solar cell. BACKGROUND

[0002] As a core component of photovoltaic power generation, the production quality of a solar cell directly determines the efficiency and service life of a module. The current mainstream cell is a silicon-based thin sheet with a thickness of about 150-200 microns, which is prone to microscopic defects such as hidden cracks, broken grids, contamination, and scratches during production. In order to ensure product yield, optical vision detection technology has become an industry standard: through a high-resolution industrial camera to capture the surface image of the cell, combined with machine vision algorithm to automatically identify defects. However, this technology has very high requirements for the positioning accuracy and stability of the cell: the cell needs to be strictly in the focal plane of the camera during detection, and any micron-level displacement or vibration will cause imaging blur and a sharp increase in false detection rate.

[0003] In the existing detection equipment, the belt conveying line is widely used for cell transmission due to its simple structure and low cost. However, the inherent physical properties of the belt (such as elastic deformation, friction coefficient fluctuation, and slight shaking during high-speed operation) cause the cell to produce position drift and attitude deflection during transmission. In order to meet the sub-millimeter positioning requirements of optical detection, the equipment has to introduce a high-precision manipulator (such as a six-axis robot or a precision screw module) for secondary positioning: when the cell is conveyed to the detection station by the belt, the manipulator needs to perform a series of complex actions such as grabbing, lifting, rotating, and aligning to accurately place the cell on the transparent stage. Although this scheme can achieve the positioning requirements, it significantly increases the system complexity, and the manipulator and its servo control system account for more than 30% of the total cost of the equipment. Moreover, multi-axis cooperative debugging is time-consuming and difficult to maintain, so it is necessary to improve the existing detection equipment. SUMMARY

[0004] The present application aims to provide a defect detection device for a solar cell to solve the technical problem of difficult cell positioning in the prior art.

[0005] The utility model provides a kind of defect detection equipment of solar cell piece, including detection platform, the middle part of detection platform is provided with feed recess, feed recess is in the state of open near the side of detection platform feed, and the end of detection platform away from feed is provided with detection support, and the end of detection support is provided with detection camera, still includes conveying mechanism and positioning mechanism;Conveying mechanism includes the feed belt and discharge belt respectively being arranged in the both ends of detection platform, and the rotating direction of feed belt and discharge belt is identical;Positioning mechanism includes the suspension bracket being arranged in the side of detection platform close to ground, and air column is provided on suspension bracket, and air column is located directly below detection camera, and piston is slidably connected in the inside of air column, and the upper end of air column is slidably connected with the air guide pipe synchronous with piston, and air guide pipe is hollow structure, and the end of air guide pipe located in the inside of air column is provided with air hole, and the end of air guide pipe close to detection camera is provided with air guide seat, and the surface of air guide seat is provided with suction cup with the air guide pipe conduction, and the both sides of feed recess are provided with L-shaped positioning seat matched with air guide seat.

[0006] As a preferred technical solution of the utility model, the side of the L-shaped positioning seat close to the center of the detection platform is provided with a positioning groove matched with the air guide seat, and the side of the positioning groove is provided with a guide inclined surface.

[0007] As a preferred technical solution of the utility model, the end of the L-shaped positioning seat away from the ground is provided with a cleaning assembly, which blows air towards the air guide seat when the piston moves towards the direction of the detection camera. The cleaning assembly includes an air outlet provided on the side wall of the air column and in communication with the inside of the air column. The air outlet is located on the same side of the piston as the air guide pipe. One end of the flexible hose connected to the air outlet away from the air column. The other end of the flexible hose is connected to the air guide plate. The air guide plate is provided with an air outlet pipe fixedly connected with the L-shaped positioning seat. The air outlet end of the air outlet pipe is inclined towards the center of the detection platform.

[0008] As a preferred technical solution of the utility model, the side of the suspension bracket is provided with a lifting drive assembly for adjusting the height of the piston. When the piston moves towards the direction close to the detection camera, the air pressure inside the air guide pipe and the suction cup is greater than the outside atmospheric pressure. When the piston moves away from the direction of the detection camera, the air pressure inside the air guide pipe and the suction cup is less than the outside atmospheric pressure. The lifting drive assembly includes a guide rod slidably connected to the end of the air column close to the ground. The end of the guide rod away from the ground is fixedly connected with the piston. The end of the air guide pipe close to the ground is fixedly connected with a push plate. The suspension bracket is provided with a telescopic drive device for driving the push plate to lift. The middle part of the piston is slidably connected with a slide rod. One end of the slide rod is fixedly connected with the end of the air guide pipe. The other end of the slide rod is provided with a limiting plate. The limiting plate and the piston are provided with a buffer spring therebetween.

[0009] As a preferred technical scheme of the present application, the feeding groove is provided with a baffle near one end of the detection support, and the air guide seat is provided with a contact head for supplying power to the battery piece.

[0010] As a preferred technical scheme of the present application, the feeding groove is provided with feeding belts on both sides, the two feeding belts are arranged in parallel, the detection platform is provided with a feeding drive assembly for driving the two feeding belts to rotate synchronously and in the same direction, the two feeding belts are arranged on the side of the detection platform away from the ground, the detection platform is provided with discharge belts on both sides, the two discharge belts are arranged in parallel on the side of the detection platform close to the ground, and the detection platform is provided with a discharge drive assembly for driving the two discharge belts to move synchronously.

[0011] As a preferred technical scheme of the present application, the feeding drive assembly comprises a cross plate arranged on both sides of the feeding groove, the cross plate is rotatably connected with a feeding transmission rod at the end away from the detection platform, the cross plate is rotatably connected with a first rotating shaft at the side close to the detection platform, the end of the first rotating shaft and the two sides of the feeding transmission rod are provided with feeding pulleys matched with the feeding belts, the side surface of the cross plate is provided with a feeding motor, the output shaft of the feeding motor is fixedly connected with a first bevel gear, the first bevel gear is meshingly connected with a second bevel gear fixedly connected with the feeding transmission rod, and the discharge drive assembly comprises an L-shaped fixed plate fixedly connected with the detection platform, the L-shaped fixed plate is rotatably connected with a discharge transmission rod at the end away from the detection platform, the L-shaped fixed plate is rotatably connected with a second rotating shaft at the side close to the detection platform, the end of the second rotating shaft and the two sides of the discharge transmission rod are provided with discharge pulleys matched with the discharge belts, and the side surface of the L-shaped fixed plate is provided with a discharge motor, the output shaft of the discharge motor is fixedly connected with a third bevel gear, and the third bevel gear is meshingly connected with a fourth bevel gear fixedly connected with the discharge transmission rod.

[0012] By adopting the above technical scheme, the present application has the following beneficial effects: Dynamic self-positioning mechanism: when the air guide seat is lifted along the vertical direction, the right-angle constraint surface of the L-shaped positioning seat automatically matches the edge of the battery piece, and the two-dimensional plane positioning of the battery piece in the X / Y direction is completed synchronously in a single linear motion process, without the need for an additional mechanical correction step, thereby significantly shortening the positioning period.

[0013] Non-contact protection technology: during the lifting of the air guide seat, the suction cup array integrated on the top of the air guide seat continuously sprays uniform air flow upward, forming a stable air film at the bottom of the battery piece, so that the battery piece is always in the air floating suspension state. This design completely eliminates the physical contact between the air guide seat and the surface of the battery piece, and fundamentally avoids the risk of scratches, micro-crack expansion and hidden cracks caused by friction in the traditional mechanical positioning.

[0014] Positioning-protection integration: air floatation and positioning movement timing coupling, the suction cup activates air supply at the moment of air guide seat starting, ensures the battery piece in zero contact protection environment, especially the protection efficiency of ultra-thin battery piece is remarkable. BRIEF DESCRIPTION OF DRAWINGS

[0015] In order to more clearly illustrate the specific embodiments of the present application or the technical solutions in the prior art, the drawings needed to be used in the specific embodiments or prior art description will be briefly introduced below. Obviously, the drawings in the following description are some embodiments of the present application, and those skilled in the art can also obtain other drawings according to these drawings without creative labor.

[0016] Figure 1 It is a structural schematic view of a solar cell defect detection equipment.

[0017] Figure 2 It is a front view of a solar cell defect detection equipment.

[0018] Figure 3 It is a structural schematic view of a detection platform in a solar cell defect detection equipment.

[0019] Figure 4 It is a structural schematic view of a feeding drive assembly in a solar cell defect detection equipment.

[0020] Figure 5 It is a structural schematic view of a discharging drive assembly in a solar cell defect detection equipment.

[0021] Figure 6 It is a structural schematic view of a positioning mechanism in a solar cell defect detection equipment.

[0022] Figure 7 It is a top view of Figure 6 .

[0023] Figure 8 It is a structural schematic view of an air column inside a solar cell defect detection equipment.

[0024] Figure 9 It is a structural schematic view of an L-shaped positioning seat in a solar cell defect detection equipment.

[0025] In the figure: 1, detection platform; 2, detection support; 3, detection camera; 4, feeding groove; 5, baffle; 6, conveying mechanism; 7, positioning mechanism; 8, feeding belt; 9, feeding motor; 10, first bevel gear; 11, second bevel gear; 12, feeding transmission rod; 13, first rotating shaft; 14, feeding pulley; 15, feeding drive assembly; 16, L-shaped fixing plate; 17, second rotating shaft; 18, discharging pulley; 19, discharging motor; 20, third bevel gear; 21, discharging transmission rod; 22, fourth bevel gear; 23, discharging drive assembly; 24, discharging belt; 25, air column; 26, lifting drive assembly; 27, air guide pipe; 28, air guide base; 29, suction cup; 30, L-shaped positioning base; 31, suspension frame; 32, air guide plate; 33, air outlet pipe; 34, flexible hose; 35, air outlet; 36, cleaning assembly; 37, piston; 38, air hole; 39, sliding rod; 40, buffer spring; 41, limiting plate; 42, telescopic drive device; 43, guide rod; 44, push plate; 45, positioning groove; 46, guide inclined surface; 47, cross plate. DETAILED DESCRIPTION

[0026] The technical solutions of the present application will be described clearly and completely below in combination with the drawings. Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0027] In one embodiment, referring to Figure 1 , Figure 2 , Figure 3 , Figure 6 , Figure 7 , Figure 8 and Figure 9 , a defect detection device for solar cell pieces comprises a detection platform 1, a feeding groove 4 is arranged at the middle part of the detection platform 1, the feeding groove 4 is in an open state near the feeding side of the detection platform 1, that is, the detection platform 1 presents a C-shaped structure with the opening to the right, a supporting part can be arranged below the detection platform 1, so that the detection platform 1 is level with the production line of the cell pieces, so that the cell pieces can be smoothly transferred to the detection platform 1 after production, and the cell pieces after detection can be transferred to the subsequent production line, a detection support 2 is arranged at the upper surface right end of the detection platform 1, the detection support 2 is in an L-shaped structure, the upper end of the detection support 2 is a cantilever extending to the left side, a detection camera 3 is arranged at the left end above the detection support 2, the detection camera 3 can take a picture of the area directly below, and the detection camera 3 transmits data to a subsequent picture processing device, so that the picture processing device analyzes the picture, thereby judging the state of the cell pieces.

[0028] The conveying mechanism 6 comprises an input belt 8 and an output belt 24 arranged at both ends of the detection platform 1, and the input belt 8 and the output belt 24 are clockwise rotating, the input belt 8 is arranged on the left side of the upper surface of the detection platform 1, and the battery piece production equipment conveying belt can transfer the battery piece to the input belt 8, so that the battery piece can be subjected to subsequent detection processing, and the output belt 24 is arranged on the right side below the detection platform 1, and the output belt 24 can transfer the battery piece after detection to the subsequent battery piece processing flow line, so that the entire detection equipment is directly installed in the middle part of the flow line, and the detection of the battery piece will not interrupt the entire battery piece processing step.

[0029] The positioning mechanism 7 comprises a suspension frame 31 arranged on the left side of the lower surface of the detection platform 1, the lower end of the suspension frame 31 is fixedly connected with a vertically arranged air column 25, the air column 25 is arranged directly below the detection camera 3, the air column 25 is a hollow structure, a piston 37 is slidably connected in the air column 25, a vertically arranged air guide pipe 27 is slidably connected to the upper end of the air column 25, the lower end of the air guide pipe 27 extends into the air column 25, and the air guide pipe 27 is located above the piston 37, a plurality of air holes 38 are arranged on the lower part of the side wall of the air guide pipe 27, so that the space above the air column 25 is in communication with the inside of the air guide pipe 27, when the piston 37 moves upward, the gas above the air column 25 enters the air guide pipe 27 through the air holes 38, an air guide seat 28 is arranged above the air guide pipe 27, the air guide seat 28 is a square plate structure, a suction cup 29 is arranged on the upper surface of the air guide seat 28, the inside of the air guide seat 28 is hollow, so the air guide pipe 27, the air guide seat 28 and the suction cup 29 are all in communication, so when the piston 37 moves upward, the suction cup 29 blows gas upward, but when the piston 37 moves downward, the suction cup 29 inhales air inward, so as to adsorb the battery piece through the suction cup 29, L-shaped positioning seats 30 are arranged on the front and rear sides of the upper surface of the detection platform 1, the upper end of the L-shaped positioning seat 30 is a flat plate facing the center of the detection platform 1, so when the air guide seat 28 moves upward, the air guide seat 28 drives the battery piece to move upward, when the battery piece moves to contact the flat plate of the L-shaped positioning seat 30, the flat plate of the L-shaped positioning seat 30 and the air guide seat 28 complete the fixing of the battery piece, and since the lower part of the L-shaped positioning seat 30 is a vertical plate, the positioning effect is achieved through the L-shaped positioning seat 30, when the air guide seat 28 tightly presses the battery piece, the front and rear positions of the battery piece are locked, so the positioning effect is achieved, and since the position of the flat plate above the L-shaped positioning seat 30 is low, although the suction cup 29 blows air when the air guide seat 28 moves upward, the distance of upward movement is limited, so the battery piece will not completely separate from the upper part of the air guide seat 28, so the battery piece will move upward with the air guide seat 28. In order to make the positioning more accurate, a positioning groove 45 is arranged on the lower surface of the flat plate above the L-shaped positioning seat 30, and in order to more conveniently move the battery piece into the positioning groove 45, a guide inclined surface 46 is arranged on the lower part of the positioning groove 45, so that the battery piece can move into the positioning groove 45 along the guide inclined surface 46, and the positioning of the battery piece is completed.

[0030] In one case of the embodiment, please refer to Figure 6 、 Figure 7 and Figure 8A cleaning assembly 36 is arranged on the upper part of the L-shaped positioning seat 30. The cleaning assembly 36 is used to blow air to the upper surface of the battery piece, so as to clean the upper surface of the battery piece. When the piston 37 moves upward, the cleaning assembly 36 blows air downward, so as to clean the battery piece. The cleaning assembly 36 comprises a plurality of air outlet pipes 33 arranged on the upper part of the L-shaped positioning seat 30. The end of the air outlet pipe 33 close to the center of the detection platform 1 is inclined downward, so that the air outlet pipe 33 blows air upward to the upper part of the air guide seat 28, so that the air flow blown by the air outlet pipe 33 cleans the upper surface of the battery piece. The upper end of the air outlet pipe 33 is connected to the air guide plate 32. The air outlet 35 is arranged on the upper part of the air column 25. The lower end of the flexible hose 34 is connected to the air outlet 35. The upper end of the flexible hose 34 is connected to the middle part of the air guide plate 32. Therefore, when the piston 37 moves upward, the air in the air column 25 enters the air guide plate 32 through the air outlet 35 and the flexible hose 34, and finally the air flow is discharged through the air outlet pipe 33, so as to blow air.

[0031] In one case of the embodiment, please refer to Figure 8The lifting driving assembly 26 is arranged in the middle of the suspension frame 31, and drives the piston 37 to move up and down along the inside of the air column 25, so as to realize the height adjustment effect of the piston 37. When the piston 37 moves upward, the gas in the air column 25 is discharged outward through the suction cup 29 and the air outlet pipe 33, so that the air pressure at the suction cup 29 is greater than the outside air pressure, but when the piston 37 moves downward, the external gas needs to enter the inside of the air column 25, at this time the air pressure at the suction cup 29 is less than the outside air pressure, at this time the suction cup 29 can adsorb the battery piece. The lifting driving assembly 26 includes a guide rod 43 arranged below the air column 25, the two guide rods 43 are vertically arranged, the middle part of the guide rod 43 is slidably connected with the lower end of the air column 25, the upper end of the guide rod 43 is fixedly connected with the lower surface of the piston 37, and the lower end of the guide rod 43 is fixedly connected with a horizontally arranged push plate 44. A telescopic driving device 42 is arranged in the middle of the suspension frame 31, the telescopic driving device 42 is fixedly connected with the push plate 44, for example, the telescopic driving device 42 can be an electric push rod, the telescopic driving device 42 is fixedly connected with the push plate 44 at the extending end, and the electric push rod can drive the push plate 44 to move up and down, so that the piston 37 moves up and down along the inner wall of the air column 25. A sliding rod 39 is slidably connected in the middle of the piston 37, the upper end of the sliding rod 39 is fixedly connected with the lower end of the air guide pipe 27, and the lower end of the sliding rod 39 is provided with a limiting plate 41. The buffer spring 40 is arranged between the limiting plate 41 and the lower surface of the piston 37, and the buffer spring 40 is sleeved outside the sliding rod 39. When the piston 37 moves upward, the air guide pipe 27 and the piston 37 move upward synchronously, and when the air guide base 28 is tightly arranged below the L-shaped positioning seat 30, the air guide pipe 27 stops moving, at this time the buffer spring 40 is elongated, at this time the airflow can only blow downward through the air outlet pipe 33, so that the upper surface of the battery piece which is positioned is cleaned. The cleaning efficiency is improved.

[0032] In one case of the embodiment, please refer to Figure 2 and Figure 3A baffle 5 is arranged at the right end of the feeding groove 4, which can limit the maximum rightward moving distance of the battery piece when it moves rightward along with the feeding belt 8, facilitating the subsequent upward moving of the battery piece by the air guide seat 28. Contact heads for supplying power to the battery piece are arranged at the two sides of the air guide seat 28, which are conventional technical means and can contact the power supply ends at the two sides of the battery piece to perform reverse power supply treatment. When the air guide seat 28 and the L-shaped positioning seat 30 complete clamping of the battery piece, the contact heads at the two sides can supply power to the battery piece. At this time, positive bias is applied to the solar battery piece to simulate the working state, so that electrons and holes diffuse from the N region and the P region to the junction region and recombine to release infrared photons. The infrared camera is arranged inside the detection camera, and the defect area presents light and dark differences due to abnormal carrier recombination. Therefore, the device can not only realize appearance detection, but also realize functional detection through electroluminescence detection.

[0033] In one case of the embodiment, please refer to Figure 2 and Figure 4 The feeding belt 8 is arranged on the left side of the upper surface of the detection platform 1, and two feeding belts 8 are arranged on the front and rear sides of the feeding groove 4, so that the front and rear ends of the battery piece can be placed on the feeding belt 8. When the feeding belt 8 rotates clockwise, the battery piece moves rightward, thereby realizing the feeding effect. A feeding drive assembly 15 for driving the two feeding belts 8 to rotate synchronously is arranged on the left side of the detection platform 1. The feeding drive assembly 15 includes a cross plate 47 arranged on the front and rear sides of the feeding groove 4, the left end of the cross plate 47 is rotatably connected to the front and rear ends of the feeding transmission rod 12, a plurality of first rotating shafts 13 are arranged on the right side of the cross plate 47, the end of the first rotating shaft 13 and the front and rear sides of the feeding transmission rod 12 are provided with feeding pulleys 14 matched with the feeding belt 8, the left and right ends of the feeding belt 8 are wrapped outside the feeding pulleys 14 at the two ends, and the upper part of the feeding pulley 14 in the middle is in contact with the upper part of the feeding belt 8, thereby realizing the lifting effect. A feeding motor 9 is arranged on the left side of the front cross plate 47, the output shaft of the feeding motor 9 is fixedly connected to a first bevel gear 10, the first bevel gear 10 is meshingly connected to a second bevel gear 11, and the second bevel gear 11 is fixedly connected to the front end of the feeding transmission rod 12. Therefore, the feeding motor 9 drives the feeding transmission rod 12 to rotate through gear transmission, so that the two feeding belts 8 rotate synchronously.

[0034] In one case of the embodiment, please refer to Figure 2 and Figure 5The right side of the lower surface of the detection platform 1 is provided with an ejection belt 24, two ejection belts 24 are arranged on the front and rear sides below the detection platform 1, and the two ejection belts 24 are just located on the front and rear sides of the air guide seat 28. The spacing between the two ejection belts 24 is less than the width of the battery piece, but the spacing between the two ejection belts 24 is greater than the width of the air guide seat 28. Therefore, when the battery piece moves downward with the air guide seat 28, the front and rear ends of the battery piece will fall on the ejection belt 24, at which time the battery piece will be separated from the suction cup 29. And the right side below the detection platform 1 is provided with an ejection driving assembly 23, which can drive the two ejection belts 24 to rotate clockwise. The ejection driving assembly 23 includes L-shaped fixed plates 16 arranged on the front and rear sides of the lower surface of the detection platform 1, the right ends of the L-shaped fixed plates 16 are rotatably connected to the front and rear ends of the ejection transmission rod 21 arranged in front and back directions, and a plurality of second shafts 17 are arranged on the left side of the L-shaped fixed plate 16. The end of the second shaft 17 and the front and rear sides of the ejection transmission rod 21 are provided with ejection pulleys 18, the two ends of the ejection belt 24 are just wrapped around the ejection pulleys 18 at both ends, the upper part of the ejection belt 24 contacts the upper part of the ejection pulley 18 in the middle, and the ejection pulley 18 in the middle plays a role of lifting. The right side of the front L-shaped fixed plate 16 is provided with an ejection motor 19, the output shaft of the ejection motor 19 is fixedly connected with a third bevel gear 20, the third bevel gear 20 is engaged with a fourth bevel gear 22, and the fourth bevel gear 22 is fixedly connected with the front end of the ejection transmission rod 21. At this time, the ejection motor 19 drives the ejection transmission rod 21 to rotate through gear transmission, so that the ejection belt 24 rotates clockwise.

[0035] In the implementation process of the embodiment, the detection equipment is installed in the middle of the battery piece processing flow line, and the heights of the ejection belts 24 and the feeding belts 8 on both sides are adjusted to be equal to the production flow line, for example, the upper surface of the left feeding belt 8 can be set to be equal to the conveying belt, and the right side of the L-shaped fixed plate 16 is inclined upward to the right, so that the right end of the ejection belt 24 is lifted to be equal to the right side of the conveying belt, so that the battery piece completes the detection process during moving on the conveying belt of the flow line.

[0036] The battery piece moves along with the conveying belt of the processing pipeline to the left end of the feeding belt 8, at this time the feeding motor 9 drives the feeding belt 8 to move rightwards, when the battery piece moves above the air guide seat 28, the battery piece is separated from the feeding belt 8, and the baffle 5 blocks the tendency of the battery piece to move rightwards. The telescopic driving device 42 drives the piston 37 to move upwards, at this time the air guide pipe 27 and the air guide seat 28 move upwards, and at this time the gas in the air column 25 is blown upwards by the suction cup 29, so that there is a gap between the suction cup 29 and the battery piece, the air flow blown by the suction cup 29 can hold up the battery piece, the battery piece moves upwards along with the air guide seat 28, when the side edge of the battery piece contacts the guide inclined surface 46, the battery piece moves towards the center of the air guide seat 28, which realizes the positioning effect, and at this time the battery piece is held up by the air flow, so that the suction cup 29 will not scratch the lower surface of the battery piece during the movement of the battery piece, when the upper surface of the battery piece is attached to the inside of the positioning groove 45, a part of the air guide seat 28 and the L-shaped positioning seat 30 is in the state of overlapping, so that the air guide seat 28 and the L-shaped positioning seat 30 complete the clamping treatment of the battery piece, at this time the piston 37 continues to move upwards, the air guide pipe 27 stops moving, so that the gas in the air column 25 is discharged to the outside through the air outlet pipe 33, at this time the air flow blown by the air outlet pipe 33 blows the upper surface of the battery piece, the dust on the upper surface of the battery piece is blown away, so as to realize the cleaning treatment.

[0037] When the piston 37 moves downward, the buffer spring 40 is first restored to the initial state, and in the process of recovery of the buffer spring 40, the piston 37 is lowered, but the air guide pipe 27 is not lowered, at this time, the partial suction cup 29 generates sufficient negative pressure, so that the suction cup 29 can stably complete the adsorption process of the battery piece, when the piston 37 is lowered to the normal state of the buffer spring 40 below, the air guide pipe 27 moves downward with the piston 37, that is, the suction cup 29 moves downward with the battery piece, when the battery piece is separated from the positioning groove 45 of the L-shaped positioning seat 30, the detection camera 3 photographs the upper surface of the battery piece at this time, and analyzes the photo, thereby completing the detection process of the battery piece. A contact sensor can be arranged on the air column 25 to judge the height of the air guide seat 28, so that after the battery piece is completely separated from the L-shaped positioning seat 30, the detection camera 3 can timely take a photo, or the detection camera 3 can continuously take a photo of the battery piece, when the photo taken by the detection camera 3 includes the complete battery piece, the subsequent image analysis equipment can effectively analyze the image, that is, the detection time can be judged by the subsequent image processing equipment. When the air guide seat 28 drives the battery piece to be in contact with the discharge belt 24, at this time, the front and rear ends of the battery piece are lifted by the discharge belt 24, at this time, the battery piece falls on the discharge belt 24, and the piston 37 stops descending, at this time, the air pressure above the piston 37 is restored to the same state as the external atmospheric pressure, the discharge motor 19 drives the discharge belt 24 to rotate clockwise, and the battery piece moves to the right with the discharge belt 24, so that the battery piece that has completed detection can be better moved to the conveying belt of the subsequent assembly line.

[0038] The application provides a defect detection equipment for solar cell pieces, through the cooperation of the L-shaped positioning seat 30 and the air guide seat 28, the two-dimensional plane positioning of the battery piece is automatically completed by the L-shaped structure during the vertical lifting of the air guide seat 28, the array of the suction cups 29 on the top of the air guide seat 28 sprays air flow to form a suspension air film, so that the battery piece keeps a non-contact suspension state during positioning, and the risk of mechanical scratching is completely avoided, the positioning and air floating protection time sequence are coupled, physical zero contact is realized, the integrity of the ultra-thin battery piece is especially ensured, and a single-step action replaces the multi-axis adjustment link of the traditional mechanical hand, and the positioning efficiency is improved.

[0039] In the description of the present application, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application. In addition, the terms "first", "second", "third" are only for the purpose of description, and cannot be understood as indicating or implying relative importance.

Claims

1. A solar cell defect detection device, comprising a detection platform, a middle part of the detection platform is provided with a feeding groove, the feeding groove is in an open state near a feeding side of the detection platform, an end of the detection platform away from the feeding is provided with a detection support, and an end of the detection support is provided with a detection camera, characterized in that, Also include conveying mechanism and positioning mechanism; The conveying mechanism comprises an inlet belt and an outlet belt arranged at two ends of the detection platform respectively, and the rotating directions of the inlet belt and the outlet belt are same; The positioning mechanism comprises a suspension frame arranged on the side of the detection platform close to the ground, and an air column is arranged on the suspension frame and located directly below the detection camera, a piston is slidably connected in the air column, a gas guide pipe that moves synchronously with the piston is slidably connected to the upper end of the air column, the gas guide pipe is a hollow structure, a gas permeable hole is arranged at one end of the gas guide pipe in the air column, a gas guide seat is arranged at one end of the gas guide pipe close to the detection camera, and a suction disc in communication with the gas guide pipe is arranged on the surface of the gas guide seat, and L-shaped positioning seats matched with the gas guide seat are arranged on both sides of the inlet groove.

2. The solar cell defect inspection apparatus according to claim 1, wherein The L-shaped positioning seat is provided with a positioning groove matched with the gas guide seat on the side close to the center of the detection platform, and a guide inclined surface is arranged on the side of the positioning groove.

3. The solar cell defect inspection apparatus according to claim 1, wherein A cleaning assembly is arranged at the end of the L-shaped positioning seat away from the ground, and the cleaning assembly blows air towards the gas guide seat when the piston moves towards the direction of the detection camera.

4. The solar cell defect inspection apparatus according to claim 3, wherein The cleaning assembly comprises an air outlet arranged on the side wall of the air column and in communication with the inside of the air column, the air outlet is located on the same side of the piston as the gas guide pipe, one end of the air outlet is connected to one end of a flexible hose, the other end of the flexible hose is connected to a gas guide plate, the gas guide plate is provided with an air outlet pipe fixedly connected with the L-shaped positioning seat, and the air outlet end of the air outlet pipe is inclined towards the center of the detection platform.

5. The solar cell defect inspection apparatus according to claim 1, wherein A lifting drive assembly for adjusting the height of the piston is arranged on the side of the suspension frame, the air pressure inside the gas guide pipe and the suction disc is greater than the external atmospheric pressure when the piston moves towards the direction close to the detection camera, and the air pressure inside the gas guide pipe and the suction disc is less than the external atmospheric pressure when the piston moves away from the detection camera.

6. The solar cell defect inspection apparatus according to claim 5, wherein The lifting drive assembly comprises a guide rod slidably connected to the end of the air column close to the ground, the piston is fixedly connected to the end of the guide rod away from the ground, a push plate is fixedly connected to the end of the gas guide pipe close to the ground, and an extension drive device for driving the push plate to lift and lower is arranged on the suspension frame.

7. The solar cell defect inspection apparatus according to claim 6, wherein A sliding rod is slidably connected to the middle of the piston, one end of the sliding rod is fixedly connected to the end of the gas guide pipe, the other end of the sliding rod is provided with a limiting plate, and a buffer spring is arranged between the limiting plate and the piston.

8. The solar cell defect inspection apparatus according to claim 1, wherein A baffle is arranged at the end of the inlet groove close to the detection support, and a contact head for supplying power to the battery piece is arranged on the gas guide seat.

9. The solar cell defect inspection apparatus according to claim 1, wherein Both sides of the inlet groove are provided with inlet belts, the two inlet belts are arranged in parallel, the detection platform is provided with an inlet drive assembly for driving the two inlet belts to rotate synchronously and in the same direction, the two inlet belts are arranged on the side of the detection platform away from the ground, both sides of the detection platform are provided with outlet belts, the two outlet belts are arranged in parallel on the side of the detection platform close to the ground, and the detection platform is provided with an outlet drive assembly for driving the two outlet belts to move synchronously.

10. The solar cell defect inspection apparatus according to claim 1, wherein The feeding driving assembly comprises a cross plate arranged on both sides of the feeding groove, a feeding transmission rod rotatably connected to one end of the cross plate away from the detection platform, a first rotating shaft rotatably connected to one side of the cross plate close to the detection platform, feeding pulleys arranged on the end of the first rotating shaft and on both sides of the feeding transmission rod and matched with the feeding belt, a feeding motor arranged on the side of the cross plate, a first bevel gear fixedly connected to the output shaft of the feeding motor, a second bevel gear fixedly connected to the feeding transmission rod and meshingly connected to the first bevel gear, the discharging driving assembly comprises an L-shaped fixed plate fixedly connected to the detection platform, a discharging transmission rod rotatably connected to one end of the L-shaped fixed plate away from the detection platform, a second rotating shaft rotatably connected to one side of the L-shaped fixed plate close to the detection platform, discharging pulleys arranged on the end of the second rotating shaft and on both sides of the discharging transmission rod and matched with the discharging belt, a discharging motor arranged on the side of the L-shaped fixed plate, a third bevel gear fixedly connected to the output shaft of the discharging motor and a fourth bevel gear fixedly connected to the discharging transmission rod and meshingly connected to the third bevel gear.

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