High-accuracy double-sheet double-sided AOI (automatic optical inspection) equipment

Abstract

The utility model belongs to the technical field of detection, and relates to high-accuracy double-sheet double-sided AOI detection equipment which comprises a feeding conveying unit, an upper AOI detection unit, a rotary adsorption unit, a lower AOI detection unit and a discharging conveying unit, the rotary adsorption unit comprises a rotary mechanism, a rotary frame and four adsorption assemblies, each adsorption assembly comprises a backlight plate and two Bernoulli suckers, the backlight plate is shaped like a Chinese character'ri 'and is provided with two through holes, the Bernoulli suckers penetrate through the through holes, the four adsorption assemblies are located on the upper portions of the four stations respectively, and the upper projection range of the Bernoulli suckers is larger than the range of the through holes; the side edges of the backlight plate are all located outside the view field of the lower AOI detection unit. According to the equipment, when the lower AOI detection unit shoots upwards, the outside of the edge of the battery piece is the range of a backlight plate, when the battery piece is irradiated with light, the color difference of the two sides is very obvious, meanwhile, the interference of a reversing frame on an image is avoided, the detection definition of the lower AOI detection unit is very high, and therefore misjudgment is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of detection, in particular to a high-accuracy double-chip double-sided AOI detection device. Background Art

[0002] Some solar cells are manufactured as a large panel and then need to be cut into two separate solar cells. When testing one by one, the efficiency is relatively low. It is more efficient to test two solar cells at the same time.

[0003] For AOI (Automated Optical Inspection), the inspection surface includes the front and back sides. The conveyor line of the solar cell is located at the bottom. For the front inspection, it can be completed by just taking a picture from the top down, but for the back inspection, it must be sucked up first, and then photographed from the bottom up.

[0004] Chinese patent CN213715411U discloses a double-cell test device, where a rotating workbench is used to transport two cells to a test station on one side of the original conveyor line for testing. The test performed at the test station here is an electrical efficiency test. In order to allow both sides of the cell to be contacted by probes to obtain the output voltage, there is no Bernoulli suction cup on the rotating workbench. However, AOI detection is different. In order to capture the complete edge structure, the solar cell must be adsorbed on the upper surface from above. However, because two solar cells are targeted here, there will be problems in the detection background, because each solar cell must use a set of Bernoulli suction cups, and the rotating table must be connected to two Bernoulli suction cups, so the lens shooting upwards is likely to capture the components on the rotating table, causing interference to the edge image of the solar cell.

[0005] Therefore, it is necessary to improve the detection equipment to solve the above problems. Summary of the invention

[0006] The main purpose of the utility model is to provide a high-accuracy double-chip double-sided AOI inspection device, which can use the backlight plate to shield the components of the rotating frame, so that when the lower AOI inspection unit simultaneously shoots two battery cells, the edge image will not be interfered by the components of the rotating frame, making the AOI inspection result more accurate.

[0007] The utility model achieves the above-mentioned purpose through the following technical solutions: a high-accuracy double-sheet double-sided AOI inspection device, comprising a feeding conveying unit, an upper AOI inspection unit, a rotary adsorption unit, a lower AOI inspection unit and a discharging conveying unit;

[0008] Four stations are evenly arranged around the rotary adsorption unit, and the four stations are a feeding station, a detection station, a discharging station and an empty station in sequence. The end of the feeding conveying unit is connected to the lower part of the feeding station, the lower AOI detection unit is located at the lower part of the detection station, the head end of the discharging conveying unit is connected to the lower part of the discharging station, and the upper AOI detection unit is located above the middle section of the feeding conveying unit;

[0009] The rotary adsorption unit includes a rotary mechanism that rotates in 90° steps, a rotary frame driven by the rotary mechanism, and four adsorption components uniformly distributed on the edge of the rotary frame around a vertical axis, each adsorption component includes a backlight plate and two groups of Bernoulli suction cups, the backlight plate is in a sun shape and has two through holes, the Bernoulli suction cups pass through the through holes, the four adsorption components are respectively located at the upper parts of four workstations, the upper projection range of the Bernoulli suction cups is larger than the range of the through holes, and the side edges of the backlight plate are all located outside the field of view of the lower AOI detection unit.

[0010] Specifically, the feeding conveying unit includes a first conveying module, a pair of adjusting conveying modules, a second conveying module and a third conveying module which are sequentially arranged along the conveying direction; the adjusting conveying module includes two adjusting synchronous belt lines and a lateral adjustment mechanism for controlling and adjusting the lateral spacing between the two synchronous belt lines; the second conveying module includes a pair of second synchronous belt lines, the interval between the two second synchronous belt lines is L2, the second conveying module is located below the upper AOI detection unit, a lower backlight panel is provided below the second conveying module, and the edge of the lower backlight panel is located outside the field of view of the upper AOI detection unit; the third conveying module includes a pair of third synchronous belt lines, the interval between the two third synchronous belt lines is L2, and the third conveying module is located at the feeding station; the first conveying module includes a pair of first synchronous belt lines arranged side by side, the interval between the two first synchronous belt lines is L1, and L1>L2.

[0011] Furthermore, a group of centering mechanisms are provided on both sides of each adjusting synchronous belt line, and a photoelectric sensor for detecting when the battery cell reaches a preset position is provided on each adjusting synchronous belt line. Two photoelectric sensors are arranged side by side on the same bracket, and the bracket straddles the two adjusting synchronous belt lines. The bracket is used to fix the surface of the photoelectric sensor perpendicular to the conveying direction of the adjusting synchronous belt line, and each adjusting synchronous belt line is provided with an independent adjusting servo motor; when the battery cell reaches the preset position, the photoelectric sensor outputs a signal to a controller, and the controller controls the adjusting servo motor on the corresponding adjusting synchronous belt line to pause.

[0012] Furthermore, the two first synchronous belt lines are driven by the same first servo motor, the two second synchronous belt lines are driven by the same second servo motor, and the two third synchronous belt lines are driven by the same third servo motor.

[0013] Furthermore, the discharging conveying unit includes a fourth conveying module and a fifth conveying module connected front and back, the fourth conveying module is located at the lower part of the discharging station, and the fourth conveying module and the fifth conveying module each include a pair of synchronous belt lines and a servo motor driving each pair of synchronous belt lines to run synchronously.

[0014] Furthermore, two first in-place sensors are provided at the lower portion of the third conveying module, and the two first in-place sensors respectively detect the arrival of two battery cells at the feeding station; two second in-place sensors are provided at the lower portion of the fourth conveying module, and the two second in-place sensors respectively detect the arrival of two battery cells at the discharging station; the first in-place sensor and the second in-place sensor are used to control the suction and release timing of the Bernoulli suction cup.

[0015] Specifically, the upper AOI detection unit and the lower AOI detection unit both include an AOI detection lens and a light shielding box. The light shielding box is a topless box-type structure consisting of four surrounding panels and a bottom plate. The AOI detection lens is located on the bottom plate. The bottom plate is provided with an opening that avoids the optical path of the AOI detection lens, and a light source for providing surface light is provided inside.

[0016] Specifically, a pair of waste discharge boxes are provided at the lower part of the empty workstation.

[0017] The beneficial effects of the technical solution of the utility model are:

[0018] When the lower AOI detection unit of the device shoots upward, the edge of the battery cell is outside the range of the backlight plate 1331. When the battery cell is illuminated, because the lower surface of the battery cell and the lower surface of the backlight plate are not at the same height, the color difference on both sides is very obvious. At the same time, the interference of the rotating frame to the image is avoided, so that the detection clarity of the lower AOI detection unit is very high, thereby reducing misjudgment. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 A three-dimensional diagram of a high-accuracy double-chip double-sided AOI inspection device according to an embodiment;

[0020] Figure 2 This is a front view of a high-accuracy double-chip double-sided AOI inspection device according to an embodiment;

[0021] Figure 3 It is a top view of a high-accuracy double-chip double-sided AOI inspection device according to an embodiment;

[0022] Figure 4 It is a three-dimensional diagram of the rotary adsorption unit;

[0023] Figure 5 A three-dimensional diagram of an adsorption component;

[0024] Figure 6 is a three-dimensional diagram of a feed conveying unit;

[0025] Figure 7 A perspective view of the adjustable conveying module.

[0026] The numbers in the figure represent:

[0027] 1- Equipment,

[0028] 11-feeding conveying unit, 111-first conveying module, 1111-first synchronous belt line, 1112-first servo motor, 112-adjusting conveying module, 1121-adjusting synchronous belt line, 11211-adjusting servo motor, 1122-lateral adjustment mechanism, 1123-centering mechanism, 1124-photoelectric sensor, 1125-bracket, 113-second conveying module, 1131-second synchronous belt line, 1132-second servo motor, 1133-lower backlight panel, 114-third conveying module, 1141-third synchronous belt line, 1142-third servo motor,

[0029] 12a-upper AOI detection unit, 12b-lower AOI detection unit, 121-AOI detection lens, 122-light shielding box, 1221-enclosure, 1222-bottom plate, 12221-opening,

[0030] 13-rotating adsorption unit, 13a-feeding station, 13b-detection station, 13c-discharging station, 13d-empty station, 131-rotating mechanism, 132-rotating frame, 133-adsorption component, 1331-backlight panel, 1332-Bernoulli suction cup,

[0031] 14-discharging conveying unit, 141-fourth conveying module, 1411-fourth synchronous belt line, 1412-fourth servo motor, 142-fifth conveying module, 1421-fifth synchronous belt line, 1422-fifth servo motor,

[0032] 15- Waste box;

[0033] 2-Battery cells. DETAILED DESCRIPTION

[0034] The utility model is further described in detail below in conjunction with specific embodiments.

[0035] Example:

[0036] like Figures 1 to 4As shown, a double-sided AOI detection device 1 with high accuracy includes a feeding and conveying unit 11, an upper AOI detection unit 12a, a rotary adsorption unit 13, a lower AOI detection unit 12b, and a discharging and conveying unit 14. Four stations are evenly distributed around the rotary adsorption unit 13, which are in sequence a feeding station 13a, a detection station 13b, a discharging station 13c, and an empty station 13d. The end of the feeding and conveying unit 11 is connected to the lower part of the feeding station 13a, the lower AOI detection unit 12b is located below the detection station 13b, the head end of the discharging and conveying unit 14 is connected to the lower part of the discharging station 14, and the upper AOI detection unit 12a is located above the middle section of the feeding and conveying unit 11.

[0037] The conveying directions of the feeding and conveying unit 11 and the discharging and conveying unit 14 are the same and on the same straight line. Therefore, the battery sheet 2 generally moves in one direction and only moves along an arc at the rotary adsorption unit 13 and passes through the detection station 13b. When the battery sheet 2 passes through the middle section of the upper AOI detection unit 12a, it will first stop, and the upper AOI detection of the upper surface is completed by the upper AOI detection unit 12a. When the battery sheet 2 passes through the detection station 13b, the lower AOI detection of the lower surface is completed by the lower AOI detection unit 12b.

[0038] As Figure 4 and Figure 5 As shown, the rotary adsorption unit 13 includes a rotary mechanism 131 that rotates step by step by 90°, a rotary frame 132 driven by the rotary mechanism 131, and four adsorption components 133 evenly distributed around the edge of the rotary frame 132 along the vertical axis. Each adsorption component 133 includes a backlight plate 1331 and two groups of Bernoulli suction cups 1332. The backlight plate 1331 is in the shape of a Chinese character 'Ri' and has two through holes 13311. The Bernoulli suction cups 1332 pass through the through holes 13311. The four adsorption components 133 are respectively located above the four stations. The upper projection range of the Bernoulli suction cups 1332 is larger than the range of the through holes 13311, and the side edges of the backlight plate 1331 are all outside the viewing field of the lower AOI detection unit 12b.

[0039] The battery cell 2 is sucked and released by the Bernoulli suction cup 1332. When the Bernoulli suction cup 1332 sucks air, low pressure is generated in the space above the battery cell 2. Therefore, when the atmospheric pressure at the bottom of the battery cell 2 is higher than the upper surface, the battery cell 2 will be held and then move with the Bernoulli suction cup 1332. Here, the Bernoulli suction cup 1332 has only a small contact with the surface of the battery cell 2, so it is helpful to protect the surface of the battery cell 2 from wear. When the lower AOI detection unit 12b shoots upward, the edge of the battery cell 2 is outside the range of the backlight plate 1331. When the battery cell 2 is illuminated, because the lower surface of the battery cell 2 is not at the same height as the lower surface of the backlight plate 1331, the color difference on both sides is very obvious. At the same time, the interference of the rotating frame 132 to the image is avoided, so that the detection clarity of the lower AOI detection unit 12b is very high, thereby reducing misjudgment.

[0040] like Figure 1 As shown, the upper AOI detection unit 12a and the lower AOI detection unit 12b both include an AOI detection lens 121 and a light shielding box 122. The light shielding box 122 is a topless box-type structure consisting of four enclosures 1221 and a bottom plate 1222. The AOI detection lens 121 is located on the bottom plate 1222. The bottom plate 1222 is provided with an opening 12221 that avoids the optical path of the AOI detection lens 121. A light source (not exposed) for providing surface light is provided in the light shielding box 122.

[0041] The upper AOI detection unit 12a and the lower AOI detection unit 12b are only different in detection direction, and the detection principle is that the light source provides surface light to illuminate the detection surface, and then uses the AOI detection lens 121 to capture the surface image of the battery cell 2. The light shielding box 122 is used to block the surrounding natural light, so that the battery cell 2 can complete the AOI detection under stable lighting conditions.

[0042] like Figure 2 and Figure 6As shown, the feed conveying unit 11 includes a first conveying module 111, a pair of adjusting conveying modules 112, a second conveying module 113 and a third conveying module 114 which are sequentially arranged along the conveying direction; the adjusting conveying module 112 includes an adjusting synchronous belt line 1121 and a lateral adjustment mechanism 1123 for controlling the lateral spacing between the two adjusting synchronous belt lines 1122; the second conveying module 113 includes a pair of second synchronous belt lines 1131, the spacing between the two second synchronous belt lines 1131 is L2, and the second conveying module 113 is located on the upper AO I detection unit, a lower backlight panel 1133 is provided below the second conveying module 113, and the edge of the lower backlight panel 1133 is located outside the field of view of the upper AOI detection unit 12a; the third conveying module 114 includes a pair of third synchronous belt lines 1141, and the interval distance between the two third synchronous belt lines 1141 is L2, and the third conveying module 1141 is located at the feeding station 13a; the first conveying module 111 includes a pair of first synchronous belt lines 1111 arranged side by side, and the interval distance between the two first synchronous belt lines 1111 is L1, and L1>L2.

[0043] In order to avoid collision during side-by-side transportation, when two battery cells 2 are fed into the device 1 together, the distance between them is relatively large, and their postures may also be biased, which is not conducive to the upper AOI detection unit 12a and the lower AOI detection unit 12b synchronously photographing the two battery cells 2. Therefore, the lateral adjustment mechanism 1123 should be used to first bring the two battery cells 2 closer to each other, so as to reduce the field of view and make the height of the AOI detection lens 121 closer to the surface height of the battery cell 2, which is conducive to improving the detection clarity and ensuring the accuracy of the detection. When the upper AOI detection unit 12a is detecting, the lower backlight panel 1133 is also needed to provide a background for taking pictures, so that the edge image of the battery cell 2 is clearer.

[0044] like Figure 2As shown, the two first synchronous belt lines 1111 are driven by the same first servo motor 1112, the two second synchronous belt lines 1121 are driven by the same second servo motor 1122, and the two third synchronous belt lines 1141 are driven by the same third servo motor 1142. The discharging conveying unit 14 includes a fourth conveying module 141 and a fifth conveying module 142 connected front and back, the fourth conveying module 141 is located at the lower part of the discharging station 13c, the fourth conveying module 141 includes a pair of fourth synchronous belt lines 1411 and a fourth servo motor 1412 driving each pair of synchronous belt lines 1411 to run synchronously, and the fifth conveying module 142 includes a pair of fifth synchronous belt lines 1421 and a fifth servo motor 1422 driving each pair of fifth synchronous belt lines 1421 to run synchronously. Two first in-place sensors 16a are provided at the lower part of the third conveying module 114, and the two first in-place sensors 16a respectively detect that the two battery cells 2 arrive at the feeding station 13a. Two second in-place sensors 16b are provided at the lower part of the fourth conveying module 142, and the two second in-place sensors 16b respectively detect that the two battery cells 2 arrive at the discharging station 13c. The first in-place sensors 16a and the second in-place sensors 16b are used to control the suction and release timing of the Bernoulli suction cup 1332.

[0045] The first conveying module 111, the adjusting conveying module 112, the second conveying module 113 and the third conveying module 114, the fourth conveying module 141 and the fifth conveying module 142 are all standardized and modular conveying parts, which can be purchased directly at a low cost. Among them, only the conveying spacing and conveying length are not uniform among the first conveying module 111, the second conveying module 113 and the third conveying module 114, the fourth conveying module 141 and the fifth conveying module 142, and the use principle is the same. The two battery cells 2 do not need to adjust the relative position on these conveying modules, so the paired synchronous belt lines only need to be driven by the same servo motor. The first in-position sensor 16a can sense that the battery cell 2 has arrived at the feeding station 13a. At this time, the Bernoulli suction cup 1332 at the feeding station 13a will start to suck the battery cell 2, and when the battery cell 2 is transferred to the discharge station 13c, the Bernoulli suction cup 1332 will put down the battery cell 2.

[0046] like Figure 6 and Figure 7As shown, a group of centering mechanisms 1123 are provided on both sides of each adjusting synchronous belt line 1121, and a photoelectric sensor 1124 for detecting that the battery cell 2 reaches a preset position is provided on each adjusting synchronous belt line 1121. The two photoelectric sensors 1124 are arranged side by side on the same bracket 1125, and the bracket 1125 straddles the two adjusting synchronous belt lines 1121. The bracket 1125 is used to fix the surface of the photoelectric sensor 1124 perpendicular to the conveying direction of the adjusting synchronous belt line 1121, and each adjusting synchronous belt line 1121 is provided with an independent adjusting servo motor 11211; when the battery cell 2 reaches the preset position, the photoelectric sensor 1124 outputs a signal to a controller, and the controller controls the adjusting servo motor 11211 on the corresponding adjusting synchronous belt line 1121 to pause.

[0047] At the same position where the spacing between the two battery cells 2 is adjusted, the front, back, left, and right positions of the battery cells 2 can be adjusted. The front and back positions are adjusted in the following way: the battery cells 2 are transported to the corresponding photoelectric sensors 1124 through the adjusting synchronous belt line 1121, and the adjusting synchronous belt line 1121 will stop running. Because the two photoelectric sensors 1124 are side by side in the front and back positions, the front wide sides of the two battery cells 2 are aligned. The left and right positions are adjusted in the following way: after the battery cells 2 have stopped, the centering mechanism 1123 can move closer to each other and adjust the lateral position of the battery cells 2 themselves, so that their long sides are parallel to the conveying direction of the adjusting synchronous belt line 1121, and the left and right positions are determined.

[0048] like Figure 2 and Figure 3 As shown, a pair of waste boxes 15 are provided at the lower portion of the empty station 13d.

[0049] After the AOI inspection of the upper and lower surfaces has been completed, the device 1 can obtain information on whether the battery cell 2 is qualified. If the battery cell 2 is qualified, the Bernoulli suction cup 1332 will place it on the fifth conveying module 142; if the battery cell 2 is unqualified, the Bernoulli suction cup 1332 will place it in the waste box 15. Because each suction component 133 absorbs two battery cells 2, two waste boxes 15 are required for placement. In this way, the space of the device 1 is reasonably utilized, and waste discharge does not need to be placed in the subsequent workstation for completion.

[0050] The above are only some embodiments of the present invention. For those skilled in the art, several modifications and improvements can be made without departing from the inventive concept of the present invention, which all belong to the protection scope of the present invention.

Claims

1. A high-accuracy double-sheet double-sided AOI inspection equipment, comprising a feeding conveying unit, an upper AOI inspection unit, a rotary adsorption unit, a lower AOI inspection unit and a discharging conveying unit; Four stations are evenly arranged around the rotary adsorption unit, and the four stations are a feeding station, a detection station, a discharging station and an empty station in sequence. The end of the feeding conveying unit is connected to the lower part of the feeding station, the lower AOI detection unit is located at the lower part of the detection station, the head end of the discharging conveying unit is connected to the lower part of the discharging station, and the upper AOI detection unit is located above the middle section of the feeding conveying unit; characterized in that: The rotary adsorption unit includes a rotary mechanism that rotates in 90° steps, a rotary frame driven by the rotary mechanism, and four adsorption components uniformly distributed on the edge of the rotary frame around a vertical axis, each adsorption component includes a backlight plate and two groups of Bernoulli suction cups, the backlight plate is in a sun shape and has two through holes, the Bernoulli suction cups pass through the through holes, the four adsorption components are respectively located at the upper parts of four workstations, the upper projection range of the Bernoulli suction cups is larger than the range of the through holes, and the side edges of the backlight plate are all located outside the field of view of the lower AOI detection unit.

2. The high-accuracy double-sheet double-sided AOI inspection equipment according to claim 1, characterized in that: The feeding conveying unit includes a first conveying module, a pair of adjusting conveying modules, a second conveying module and a third conveying module which are sequentially arranged along the conveying direction; the adjusting conveying module includes two adjusting synchronous belt lines and a lateral adjustment mechanism for controlling and adjusting the lateral spacing between the two synchronous belt lines; the second conveying module includes a pair of second synchronous belt lines, the interval between the two second synchronous belt lines is L2, the second conveying module is located below the upper AOI detection unit, a lower backlight panel is provided below the second conveying module, and the edge of the lower backlight panel is located outside the field of view of the upper AOI detection unit; the third conveying module includes a pair of third synchronous belt lines, the interval between the two third synchronous belt lines is L2, and the third conveying module is located at the feeding station; the first conveying module includes a pair of first synchronous belt lines arranged side by side, the interval between the two first synchronous belt lines is L1, and L1>L2.

3. The high-accuracy double-sheet double-sided AOI inspection equipment according to claim 2, characterized in that: A group of centering mechanisms are provided on both sides of each adjusting synchronous belt line. A photoelectric sensor for detecting when a battery cell reaches a preset position is provided on each adjusting synchronous belt line. Two photoelectric sensors are arranged side by side on the same bracket. The bracket straddles the two adjusting synchronous belt lines. The bracket is used to fix the surface of the photoelectric sensor perpendicular to the conveying direction of the adjusting synchronous belt line. Each adjusting synchronous belt line is provided with an independent adjusting servo motor. When the battery cell reaches the preset position, the photoelectric sensor outputs a signal to a controller, and the controller controls the adjusting servo motor on the corresponding adjusting synchronous belt line to pause.

4. The high-accuracy double-sheet double-sided AOI inspection equipment according to claim 2, characterized in that: The two first synchronous belt lines are driven by a same first servo motor, the two second synchronous belt lines are driven by a same second servo motor, and the two third synchronous belt lines are driven by a same third servo motor.

5. The high-accuracy double-sheet double-sided AOI inspection equipment according to claim 4, characterized in that: The discharging conveying unit includes a fourth conveying module and a fifth conveying module connected front and back, the fourth conveying module is located at the lower part of the discharging station, and the fourth conveying module and the fifth conveying module each include a pair of synchronous belt lines and a servo motor driving each pair of synchronous belt lines to run synchronously.

6. The high-accuracy double-sheet double-sided AOI inspection equipment according to claim 5, characterized in that: Two first in-place sensors are provided at the lower part of the third conveying module, and the two first in-place sensors respectively detect that two battery cells arrive at the feeding station. Two second in-place sensors are provided at the lower part of the fourth conveying module, and the two second in-place sensors respectively detect that two battery cells arrive at the discharging station. The first in-place sensor and the second in-place sensor are used to control the suction and release timing of the Bernoulli suction cup.

7. The high-accuracy double-sheet double-sided AOI inspection equipment according to claim 1, characterized in that: The upper AOI detection unit and the lower AOI detection unit both include an AOI detection lens and a light-shielding box. The light-shielding box is a topless box-type structure consisting of four surrounding panels and a bottom plate. The AOI detection lens is located on the bottom plate. An opening that avoids the optical path of the AOI detection lens is provided on the bottom plate. A light source that provides surface light is provided in the light-shielding box.

8. The high-accuracy double-sheet double-sided AOI inspection equipment according to claim 1, characterized in that: A pair of waste discharge boxes are provided at the lower part of the empty station.

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