Automatic six-surface detection device for square enveloped battery

Abstract

The invention relates to an automatic six-surface detection device for a square enveloped battery. The automatic six-surface detection device comprises an external drawstring and an AOI detection machine, the external drawstring comprises a feeding butt joint drawstring, an OK belt line, an NG belt line, a re-throwing belt line and a discharging butt joint drawstring; the AOI detector is arranged on the side of the OK belt line; the AOI detection machine comprises a feeding carrying module, a bottom face detection visual module, a narrow face detection visual module, a large face and top face detection visual module, a double-rotor carrying module, a loop line detection module, a rotary pitch changing module, an OK discharging carrying module and an NG discharging carrying module. According to the invention, deep learning, a 2.5 D line scanning imaging technology, an annular detection module and an automatic conveying system are adopted, the difficulty of bubble foreign matter detection and distinguishing in a square battery blue film coating process is solved, the device can be in butt joint with a non-defective product runner of a front blue film coating device, a rear sorting machine and a Pack line procedure, and automatic connection of a production line after square lithium battery film coating is realized.

Description

Technical Field

[0001] The invention relates to the technical field of visual inspection, in particular to an automatic six-side inspection device for square film-coated batteries. Background Art

[0002] At present, square batteries need to be coated with a layer of blue film during production to play the role of insulation, waterproofing, and aesthetics. Among them, after coating, the blue film of some batteries will have appearance defects such as bubbles on the film surface, electrolyte on the film surface, foreign matter in the film, wrinkles, shell pits, scratches, and damage, which will affect the normal use of the battery. Therefore, it is necessary to inspect the appearance defects of the battery before and after the blue film is coated.

[0003] The existing inspection methods for the appearance of battery blue film are usually manual inspection and automatic machine inspection.

[0004] Manual inspection usually relies on high-precision cameras to magnify the surface features of the battery's blue film through a display screen, and the quality of the feature points is manually judged. Therefore, the existing manual inspection method consumes a lot of manpower and time. The average inspection time for a battery is about 18 seconds. The square battery needs to be manually flipped one surface at a time for appearance inspection. The inspection efficiency is low, and there is a possibility of false detection and missed detection due to subjective factors such as visual fatigue.

[0005] The existing automatic inspection machines are generally composed of a frame, an outer cover, a loading and handling module, a linear motor inspection module, a double-actuator handling module, a visual module, a loop detection, a conveyor line, a gear rack transverse movement module, an electric box, a controller, etc. 1) Loading and docking conveyor line: docking the belt line or manual loading after the film is coated; 2) Loading and handling module: grab the battery and perform product bottom inspection, and place it on the large surface inspection fixture; 3) Linear motor inspection module: position the product. Perform large surface appearance inspection; 4 Double-actuator handling module: the first actuator grabs the product and places it on the variable pitch rotation module. After the variable pitch rotation, the second actuator grabs the product and places it on the loop fixture; 5) Visual component: take a photo of the battery to obtain its characteristics and transmit it to the controller for analysis; 7) Unloading mechanism: grab the battery and put it into the OK or NG unloading conveyor line according to the inspection results. Therefore, the existing automatic detection method cannot distinguish between bubbles on the membrane surface and foreign matter inside the membrane from the perspective of detection and identification technology, and is prone to misdetection. This is because a single camera is generally used for detection, and it is difficult to make an accurate judgment with single-sided imaging. In addition, the existing automatic detection method has poor product compatibility. China lacks the development of camera algorithms and logic, and only uses the camera's internal algorithm. This inherent mode is only applicable to a single battery product. When the battery model is changed, the camera needs to be replaced simultaneously. Summary of the invention

[0006] The technical problem to be solved by the present invention is: to provide an automatic six-sided inspection device for square coated batteries, which adopts deep learning, 2.5D line scan imaging technology, a ring detection module and an automatic conveying system to solve the difficulties in detecting and distinguishing bubbles and foreign matter faced by the blue film process of square battery packaging, and can be connected to the good product flow channel of the front-end blue film packaging equipment, as well as the back-end sorting machine and Pack line process to realize the automatic connection of the production line after the square lithium battery is coated; it realizes the technical problem of detecting the appearance of square batteries of different models through 2.5D line scan cameras, area array cameras and 3D cameras, and uses automation technology to realize product inspection of different specifications and improve inspection efficiency.

[0007] The technical solution adopted by the present invention to solve the technical problem is: an automatic six-side detection device for square coated batteries, including an external pull belt and an AOI inspection machine; the external pull belt includes a loading butt pull belt, an OK belt line, an NG belt line, a re-investment belt line and a unloading butt pull belt; the loading butt pull belt and the unloading butt pull belt are respectively arranged at both ends of the OK belt line, and the NG belt line and the re-investment belt line are arranged in parallel between the loading butt pull belt and the unloading butt pull belt and are perpendicular to the OK belt line;

[0008] The AOI inspection machine is arranged on the side of the OK belt line; the AOI inspection machine includes a loading and handling module, a bottom surface detection vision module, a narrow surface detection vision module, a large surface and top surface detection vision module, a double-acting conveying module, a loop detection module, a rotary pitch module, an OK unloading and handling module and an NG unloading and handling module; the loading and handling module is used to load and handle the products, and the products are inspected in turn by the bottom surface detection vision module and the narrow surface detection vision module; the products that have passed the bottom and narrow surface inspection are transported by the double-acting conveying module to the rotary pitch module for a 90° rotation and then transported to the loop detection module again for large surface and top surface inspection by the large surface and top surface detection vision module; thereafter, the products are unloaded by the OK unloading and handling module or the NG unloading and handling module.

[0009] Furthermore, the top surface detection of the present invention includes three areas: pole, explosion-proof valve, and top patch; the top surface explosion-proof valve area is illuminated by an area array camera with coaxial light and four-partition ring light respectively, and a synthetic image is generated by an algorithm to detect electrolyte, scratches and explosion-proof valve missing defects on the surface of the PP film; the front area of ​​the pole is illuminated by coaxial + partitioned ring light to generate multiple images in sequence on the pole surface, and scratches and electrolyte defects on the pole surface are detected; the side wall area of ​​the pole is photographed by an area array camera with strip light to detect scratches, breakage, and electrolyte crystallization defects in the side wall of the pole; the top patch area is photographed by a line scan camera with a coaxial light source and a 3D camera respectively, and patch damage, patch missing, and patch warping defects are detected respectively;

[0010] The large surface inspection uses the same inspection method as the bottom surface to respectively inspect defects in the two large surface areas, and a 3D camera is added to the large surface to separately inspect large surface flatness defects.

[0011] Furthermore, the material loading and handling module described in the present invention includes a Y-axis linear motor, and a Z-axis screw module is arranged on the Y-axis linear motor; the Z-axis screw module is connected to a self-locking clamp, and a photoelectric induction is arranged on the self-locking clamp.

[0012] Furthermore, the bottom surface detection vision module described in the present invention includes first and second bottom surface line scan cameras and first and second bottom surface line scan light sources; the first and second bottom surface line scan light sources are correspondingly arranged above the first and second bottom surface line scan cameras, and the first and second bottom surface line scan cameras are symmetrically arranged.

[0013] Furthermore, the AOI inspection machine described in the present invention also includes a linear motor module; the linear motor module includes a linear motor, and the linear motor is provided with a rubber-coated clamping jaw, and the end face and side face of the rubber-coated clamping jaw are respectively provided with a large surface positioning cylinder assembly and a narrow surface positioning cylinder assembly.

[0014] Furthermore, the narrow surface detection vision module described in the present invention includes two first narrow surface 2.5D light sources, two second narrow surface 2.5D light sources and first and second narrow surface 2.5D line scan cameras; the two first narrow surface 2.5D light sources and the two second narrow surface 2.5D light sources are respectively arranged in a ring matrix, and the first and second narrow surface 2.5D line scan cameras are arranged on the sides of the two first narrow surface 2.5D light sources and the two second narrow surface 2.5D light sources.

[0015] Furthermore, the double-mover transport module described in the present invention includes a first mover and a second mover; the first mover is connected to the Z-axis screw module, and the Z-axis screw module is connected to the clamping cylinder; the second mover is connected to the Z-axis cylinder.

[0016] Furthermore, the top surface and large surface inspection visual module described in the present invention includes two symmetrically arranged first line scan cameras and two symmetrically arranged second line scan cameras; the top surface and large surface inspection visual module inspects the pole, explosion-proof valve and top patch area of ​​the product.

[0017] Furthermore, the NG unloading and handling module described in the present invention includes a conveyor belt line, and the side of the conveyor belt line is provided with a guide wheel that is close to the product.

[0018] Furthermore, the present invention is that: the OK belt line has an anti-static belt; the OK belt line, NG belt line and re-investment belt line are all provided with rubber-coated bearings.

[0019] The beneficial effects of the present invention are that the defects existing in the background technology are solved.

[0020] In view of the low efficiency, missed detection, and false detection of manual inspection, the present invention adopts: 1) automatic loading, which is composed of a loading belt conveyor and a grabbing mechanism, and can be connected to the front-end process; when used as a single machine, there is a separate start button, and the material can be manually loaded onto the loading belt conveyor line, so that one machine can perform multiple functions; then the grabbing robot takes the material from the conveyor line and puts it on the transfer loading line; 2) automatic inspection station, the handling mechanism clamps the product and then moves, and the product is inspected during the movement; 3) photo station, according to the signal to judge the incoming material, automatically take pictures to obtain the detection surface features and analyze, and upload OK / NG data; 4) automatic unloading, which is composed of an OK unloading belt conveyor, NG unloading belt conveyor and an unloading mechanism, and can be connected to the back-end process, or manually collect the material. The introduction of fully automatic inspection machines has promoted the development of the entire new energy and battery blue film inspection industry, and solved the problems of low inspection efficiency, high labor costs, false detection, and missed detection.

[0021] In order to solve the problem of false detection in existing automatic detection methods, the present invention combines 2.5D imaging linear array cameras, area array cameras and 3D camera systems, and uses two different cameras to take pictures of the product surface to form two visual images for comparative analysis, thereby realizing rapid distinction between bubbles on the membrane surface and foreign matter inside the membrane, reducing false detections and effectively improving the yield rate.

[0022] In order to solve the problem of poor compatibility of existing machine automatic detection methods, the present invention combines AI and traditional algorithms, develops independent module combinations, and can quickly perform compatibility expansion learning and training based on different customer samples. It can be put into production within 3 days, greatly improving the utilization rate of equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a schematic diagram of the structure of the present invention;

[0024] Figure 2 is a top view of the external drawstring of the present invention;

[0025] Figure 3 This is a top view of the AOI inspection machine of the present invention;

[0026] Figure 4 AOI inspection machine inspection flow chart of the present invention;

[0027] Figure 5 Axonometric drawing of the AOI inspection machine of the present invention;

[0028] Figure 6 Axonometric view of the AOI inspection machine of the present invention from another perspective;

[0029] Figure 7 A schematic diagram of the structure of the material loading and handling module of the present invention;

[0030] Figure 8 A schematic diagram of the structure of the bottom surface detection visual module of the present invention;

[0031] Fig. 9 A schematic diagram of the structure of the linear motor module of the present invention;

[0032] Fig.10 A schematic diagram of the structure of the narrow surface visual inspection module of the present invention;

[0033] Fig.11 A schematic diagram of the structure of the double-actuator handling module of the present invention;

[0034] Fig.12 Schematic diagram of the structure of the visual module for top surface and large surface detection of the present invention;

[0035] Fig.13 Schematic diagram of the structure of the OK material handling module of the present invention;

[0036] Fig.14 Schematic diagram of the structure of the NG material unloading and handling module of the present invention;

[0037] Fig.15 A schematic diagram of the structure of the feeding butt-jointed pull belt of the present invention;

[0038] Fig.16 The structural schematic diagram of the OK belt line of the present invention;

[0039] Fig.17 Schematic diagram of the structure of the NG belt line and the re-investment belt line of the present invention;

[0040] In the picture: 1. External drawstring; 2. AOI inspection machine; 3. Product;

[0041] 11. Pull belt for loading; 12. OK belt line; 13. NG belt line; 14. Re-investment belt line; 15. Pull belt for unloading; 16. Anti-static belt; 17. Rubber-coated bearings;

[0042] 21. Material loading and handling module; 22. Bottom surface detection visual module; 23. Narrow surface detection visual module; 24. Large surface and top surface detection visual module; 25. Double-actuator handling module; 26. Loop detection module; 27. Rotary variable pitch module; 28. OK material unloading and handling module; 29. ​​NG material unloading and handling module; 210. Linear motor module;

[0043] 211, Y-axis linear motor; 212, Z-axis screw module; 213, self-locking gripper; 214, induction photoelectric;

[0044] 221, first bottom surface line scanning camera; 222, second bottom surface line scanning camera; 223, first bottom surface line scanning light source; 224, second bottom surface line scanning light source;

[0045] 231, first narrow surface 2.5D light source; 232, second narrow surface 2.5D light source; 233, first narrow surface 2.5D line scan camera; 234, second narrow surface 2.5D line scan camera;

[0046] 241, first line scan camera; 242, second line scan camera; 243, pole detection station; 244, pole side wall detection station; 245, explosion-proof valve detection station; 246, top patch detection station;

[0047] 251, first mover; 252, second mover; 253, Z-axis screw rod module; 254, gripper cylinder; 255, Z-axis cylinder;

[0048] 291. conveyor belt line; 292. guide wheel;

[0049] 2101, linear motor; 2102, rubber-coated gripper; 2103, large-surface positioning cylinder assembly; 2104, narrow-surface positioning cylinder assembly. DETAILED DESCRIPTION

[0050] The present invention will now be described in further detail in conjunction with the accompanying drawings and preferred embodiments. These drawings are simplified schematic diagrams, which only illustrate the basic structure of the present invention in a schematic manner, and therefore only show the components related to the present invention.

[0051] like Figure 1-Figure 17 The square coated battery automatic six-side detection device shown is an automated detection equipment production line for loading, positioning, blue film detection, and unloading of various models of square blue film batteries.

[0052] like Figure 1 As shown, the device includes an external pull belt 1 and an AOI inspection machine 2; Figure 2 As shown, the external pull belt 1 includes a loading butt pull belt 11, an OK belt line 12, an NG belt line 13, a re-throw belt line 14 and a unloading butt pull belt 15; the loading butt pull belt 11 and the unloading butt pull belt 15 are respectively arranged at both ends of the OK belt line 12, and the NG belt line 13 and the re-throw belt line 14 are arranged in parallel between the loading butt pull belt 11 and the unloading butt pull belt 12 and are perpendicular to the OK belt line 12;

[0053] AOI inspection machine 2 is set on the side of OK belt line; Figure 3-Figure 6As shown, the AOI inspection machine 2 includes a loading and handling module 21, a bottom surface detection vision module 22, a narrow surface detection vision module 23, a large surface and top surface detection vision module 24, a double-acting conveying module 25, a loop detection module 26, a rotary pitch module 27, an OK unloading and handling module 28 and an NG unloading and handling module 29; the loading and handling module 21 performs loading and handling of the product 3, and the product 3 is sequentially inspected by the bottom surface detection vision module 22 and the narrow surface detection vision module 23; the product that has passed the bottom and narrow surface inspection is transported to the rotary pitch module 27 by the double-acting conveying module 25, rotated 90°, and then transported to the loop detection module 26 again for inspection of the large surface and top surface by the large surface and top surface detection vision module 24; thereafter, the product is unloaded by the OK unloading and handling module or the NG unloading and handling module.

[0054] The top surface inspection includes three areas: pole, explosion-proof valve, and top patch. The top surface explosion-proof valve area is illuminated by an area array camera with coaxial light and four-zone ring light to illuminate the explosion-proof valve respectively, and a synthetic image is generated by an algorithm to detect electrolyte, scratches, and missing explosion-proof valve defects on the PP film surface. The front area of ​​the pole is illuminated by coaxial + zoned ring light to generate multiple images in sequence to detect scratches and electrolyte defects on the pole surface. The side wall area of ​​the pole is photographed by an area array camera with strip light to detect scratches, breakage, and electrolyte crystallization defects in the side wall of the pole. The top patch area is photographed by a line scan camera with a coaxial light source and a 3D camera to detect patch damage, patch missing, and patch warping defects.

[0055] The large surface inspection uses the same inspection method as the bottom surface to detect defects in the two large surface areas, and a 3D camera is added to the large surface to separately detect large surface flatness defects.

[0056] like Figure 7 As shown, the loading and handling module 21 includes a Y-axis linear motor 211, on which a Z-axis screw module 212 is arranged; the Z-axis screw module 212 is connected to a self-locking clamp 213, on which a photoelectric induction 214 is arranged. The structure of the self-locking clamp 213 is prior art and will not be described in detail here.

[0057] like Figure 8 As shown, the bottom surface detection vision module 22 includes a first bottom surface line scan camera 221, a second bottom surface line scan camera 222 and a first bottom surface line scan light source 223, 224; the first and second bottom surface line scan light sources are correspondingly arranged above the first and second bottom surface line scan cameras, and the first and second bottom surface line scan cameras are symmetrically arranged.

[0058] like Fig. 9As shown, the AOI inspection machine 2 also includes a linear motor module 210; the linear motor module includes a linear motor 2101, a rubber-coated clamp 2102 is provided on the sliding end of the linear motor 2101, and the end face and side face of the rubber-coated clamp 2102 are respectively provided with a large surface positioning cylinder assembly 2103 and a narrow surface positioning cylinder assembly 2104.

[0059] like Fig.10 As shown, the narrow surface detection vision module 23 includes two first narrow surface 2.5D light sources 231, two second narrow surface 2.5D light sources 232 and first and second narrow surface 2.5D line scan cameras 233 and 234; the two first narrow surface 2.5D light sources and the two second narrow surface 2.5D light sources are respectively arranged in a ring matrix, and the first and second narrow surface 2.5D line scan cameras are arranged on the sides of the two first narrow surface 2.5D light sources and the two second narrow surface 2.5D light sources.

[0060] like Fig.11 As shown, the double-moving member transport module 25 includes a first moving member 251 and a second moving member 252; the first moving member is connected to the Z-axis screw module 253, the Z-axis screw module 253 is connected to the clamping claw cylinder 254; the second moving member is connected to the Z-axis cylinder 255. The structure of the rotating pitch changing module 27 has been disclosed in a prior patent application by the same applicant, and will not be described here.

[0061] like Fig.12 As shown, the top surface and large surface detection visual module 24 includes two symmetrically arranged first line scan cameras 241 and two symmetrically arranged second line scan cameras 242; the top surface and large surface detection visual module performs detection of the corresponding pole, explosion-proof valve and top patch areas on the product at the pole detection station 243, the pole side wall detection station 244, the explosion-proof valve detection station 245 and the top patch detection station 246 respectively.

[0062] like Fig.14 As shown, the NG unloading and handling 29 includes a conveyor belt line 291, and the side of the conveyor belt line 291 is provided with a guide wheel 292 close to the product. The product 3 is transmitted on the conveyor belt line 291, and the guide wheel 292 provides a stable support for the product 3 from the side.

[0063] like Fig.16 As shown, the OK belt line 12 has an anti-static belt 16 ; the OK belt line, NG belt line and re-investment belt line are all provided with rubber-coated bearings 17 .

[0064] Principle description:

[0065] 1) Vision principle: Vision guidance generally consists of industrial cameras, lenses, light sources and controllers. The industrial camera, light source and the surface of the product to be inspected are 90° perpendicular. The material to be inspected is photographed and then compared with the calibration image. The difference produced by the comparison is the abnormal feature of the detection. The calibration image is used to know which NG product such feature belongs to, and the detection data is uploaded to the system.

[0066] 2) 3-axis linkage principle: 4-axis linkage means that there are at least 4 coordinate axes (three linear coordinate systems and 1 rotational coordinate system) on one device, and they can work in coordinated motion simultaneously under the control of the computer PLC system. When the present invention clamps the product, the axes of X, Y, and Z are linked. According to the calibration point, the PLC controls the handling robot to move to the product position and clamp the product and put it into the lowering station.

[0067] The description of each section and its process is as follows:

[0068] The feeding machine includes a confluence feeding station and a feeding and transporting mechanism;

[0069] Converging feeding station: the transfer component receives the material from the pull belt and transfers the material to the AOI pull belt;

[0070] Loading and handling mechanism: 1. The clamp takes out 4 PCS products from the flow line at the same time; 2. The loading and handling module descends to pick up the materials, moves horizontally to perform bottom surface inspection, and places the products on the narrow surface inspection fixture.

[0071] The AOI inspection machine includes bottom surface inspection, narrow surface inspection linear motor, narrow surface inspection visual module, double-actuator handling linear motor, rotary variable pitch mechanism, loop module, large surface & top surface inspection visual module, OK material handling module, and NG material handling module;

[0072] Bottom surface inspection: perform appearance inspection on the bottom surface of the battery;

[0073] Narrow surface detection linear motor: Narrow surface detection transverse linear motor, the linear motor moves to perform narrow surface detection;

[0074] Narrow side inspection visual module: performs appearance inspection on the narrow side of the battery;

[0075] Double movers transport linear motors: Linear motor mover 1 takes material from the narrow surface inspection fixture and places it on the rotating variable pitch station. Linear motor mover 2 takes material from the rotating station and places it on the loop line loading position;

[0076] Rotary pitch-changing mechanism: two products form a group, the distance between the two groups is widened, and the products rotate 90°;

[0077] Loop line module: The battery is placed in the loop line fixture, two products are grouped together, two products are moved in a circle at a time, and visual inspection is performed;

[0078] Large surface & top surface inspection visual module: perform appearance inspection on the large surface & top surface of the battery;

[0079] OK unloading and handling module: The handling module takes the OK products from the loop line and places them on the OK flow channel;

[0080] NG unloading and handling module: The handling module takes NG products from the loop line and places them on the NG flow channel.

[0081] The external belt line includes NG unloading belt, straight belt line, re-feeding belt line, re-feeding handling module, and converging unloading station;

[0082] NG unloading belt: After the NG products are placed on the unloading belt line, they are manually taken out from the end of the NG belt;

[0083] Direct belt line: When the equipment is down, the product is directly transported from the belt line to the downstream equipment;

[0084] Re-feeding belt line: manually take out the NG products from the end of the NG belt and place them on the re-feeding belt line;

[0085] Re-throw handling module: The re-throw handling module takes the material from the re-throw belt line through the gripper cylinder and places it on the OK belt line;

[0086] Converging and discharging station: the transfer component receives the material from the OK belt line and transfers the material to the sorting machine.

[0087] Action / Step Description:

[0088] Feeding and docking pull belt module

[0089] Step 1, incoming materials: The employee / previous process puts 4 products on the gear rack transverse module, the belt line runs, the induction photoelectric detects the product, and the belt line stops after the belt is in place; the gear rack moves to the loading port, the blocking cylinder descends, the product flows out, the induction photoelectric senses the product, and the barcode scanner scans it. The belt starts, and the product runs to the loading position and the belt stops.

[0090] Step 2, loading: The loading and handling module takes 4 products from the bottom, and performs bottom surface inspection during the handling process. The bottom surface station uses a line scan camera, sets up a 2.5D light source and an infrared light source, takes a bottom surface image, and uses the stripe image in the 2.5D image to generate a synthetic image. In the synthetic image, the film surface defects such as bubbles, scratches, and wrinkles are detected, and the bubble defect area detected in the synthetic image is mapped to the infrared image. The edge defects are detected in the infrared image, and the bubble area of ​​the synthetic image is obtained. The AI ​​model is used to identify bubbles, soft foreign matter, and hard foreign matter. After the inspection is completed, the product is placed on the large-surface inspection fixture of the AOI inspection machine.

[0091] AOI inspection machine

[0092] Step 1, incoming materials: The upper process handling module puts 4 products on the narrow surface inspection fixture, the cylinder clamps, and the linear motor moves to perform narrow surface appearance inspection. Two sets of cameras are set up on both sides of the linear motor to use the same inspection method as the bottom surface to detect two narrow surface defects respectively;

[0093] Step 2, double-actuator module picks up materials: the narrow surface detection linear motor moves to the unloading position, the double-actuator handling module descends to pick up materials, and transports the products to the variable pitch rotation station;

[0094] Step 3, variable pitch rotation: After four products are placed in the variable pitch rotation station, the cylinder extends out and rotates each group of products 90 degrees;

[0095] Step 4: Loading the loop wire: The double-acting linear motor takes the material from the variable pitch module and places it on the loop wire fixture;

[0096] Step 5. Large surface top surface inspection: After the product is placed on the loop fixture, the side push cylinder extends to position the two products, and the loop moves to perform visual inspection on the large surface and top surface of the product. The top surface position includes three areas: pole, explosion-proof valve, and top patch. In the top surface explosion-proof valve area, the area array camera is used with coaxial light and four-partition ring light to illuminate the explosion-proof valve respectively, and the algorithm is used to generate a synthetic image to detect defects such as electrolyte, scratches, and missing explosion-proof valves on the PP film surface; in the front area of ​​the pole, the coaxial + partition ring light is used to illuminate the pole surface in time-sharing to generate multiple Image detection for scratches on the pole surface, electrolyte and other defects; in the pole side wall area, an area array camera with strip light is used to shoot objects to detect scratches, breakage, electrolyte crystallization and other defects in the pole side wall; in the top patch area, a line scan camera with a coaxial light source and a 3D camera are used to shoot the top patch area separately to detect defects such as patch breakage, patch missing, and patch warping; in the large surface area, the same detection method as the bottom surface is used to detect defects in the two large surface areas, and a 3D camera is added to the large surface to detect large surface flatness defects separately;

[0097] Step 6, OK unloading mechanism: The OK unloading and handling module takes the material from the loop line and places it on the OK belt line;

[0098] Step 7, NG unloading mechanism: The NG unloading and handling module takes the material from the loop line and places it on the NG belt line.

[0099] The present invention ① adopts a combination of 2.5D imaging line scan camera, array camera and 3D camera system to achieve the distinction between bubbles on the membrane surface and foreign matter in the membrane, reduce false detection, and effectively improve the yield rate. ② Using deep learning software and algorithms, independent module combination development, based on different customer samples, can quickly carry out compatibility expansion learning and training, and achieve online production within 2 days. ③ The automatic conveying system can realize automatic detection of products. ④ The visual inspection part completes the product operation through the loop line detection module, and cooperates with the visual module to perform product appearance inspection. ⑤ It can be customized to dock with different coating machines. Local customized development can realize docking with different coating machine manufacturers' equipment, and improve the automation process after coating. ⑥ Save labor: one machine can replace 4-8 traditional workers. ⑦ Review and verification of defective products: review and verify through the barcode scanning gun, and quickly re-judge and process defective products. ⑧ Products that are manually reviewed OK can be re-invested into the conveyor line through the assembly line.

[0100] The above description only describes the specific implementation mode of the present invention. Various examples do not limit the essential content of the present invention. After reading the description, ordinary technicians in the relevant technical field can modify or deform the specific implementation modes described above without departing from the essence and scope of the invention.

Claims

1. An automatic six-side detection device for square film-coated batteries, characterized in that: It includes an external pull belt and an AOI inspection machine; the external pull belt includes a loading butt pull belt, an OK belt line, an NG belt line, a re-throw belt line and a unloading butt pull belt; the loading butt pull belt and the unloading butt pull belt are respectively arranged at both ends of the OK belt line, and the NG belt line and the re-throw belt line are arranged in parallel between the loading butt pull belt and the unloading butt pull belt and are perpendicular to the OK belt line; The AOI inspection machine is arranged on the side of the OK belt line; the AOI inspection machine includes a loading and handling module, a bottom surface detection vision module, a narrow surface detection vision module, a large surface and top surface detection vision module, a double-acting conveying module, a loop detection module, a rotary pitch module, an OK unloading and handling module and an NG unloading and handling module; the loading and handling module is used to load and handle the products, and the products are inspected in turn by the bottom surface detection vision module and the narrow surface detection vision module; the products that have passed the bottom and narrow surface inspection are transported by the double-acting conveying module to the rotary pitch module for a 90° rotation and then transported to the loop detection module again for large surface and top surface inspection by the large surface and top surface detection vision module; thereafter, the products are unloaded by the OK unloading and handling module or the NG unloading and handling module.

2. The automatic six-side detection device for square film-coated batteries according to claim 1, characterized in that: The top surface detection includes three areas: pole, explosion-proof valve, and top patch; the top surface explosion-proof valve area is illuminated by an area array camera with coaxial light and four-zone ring light to respectively illuminate the explosion-proof valve, and a synthetic image is generated by an algorithm to detect electrolyte, scratches, and missing explosion-proof valve defects on the PP film surface; the front area of ​​the pole is illuminated by coaxial + zoned ring light to generate multiple images in sequence on the pole surface to detect scratches and electrolyte defects on the pole surface; the side wall area of ​​the pole is photographed by an area array camera with strip light to detect scratches, breakage, and electrolyte crystallization defects in the side wall of the pole; the top patch area is photographed by a line scan camera with a coaxial light source and a 3D camera to respectively detect patch damage, patch missing, and patch warping defects; The large surface inspection uses the same inspection method as the bottom surface to respectively inspect defects in the two large surface areas, and a 3D camera is added to the large surface to separately inspect large surface flatness defects.

3. The automatic six-side detection device for square film-coated batteries according to claim 1, characterized in that: The material loading and handling module comprises a Y-axis linear motor, on which a Z-axis screw rod module is arranged; the Z-axis screw rod module is connected to a self-locking clamp, on which a photoelectric induction device is arranged.

4. The automatic six-side detection device for square film-coated batteries according to claim 1, characterized in that: The bottom surface detection vision module includes first and second bottom surface line scan cameras and first and second bottom surface line scan light sources; the first and second bottom surface line scan light sources are correspondingly arranged above the first and second bottom surface line scan cameras, and the first and second bottom surface line scan cameras are symmetrically arranged.

5. The automatic six-side detection device for square film-coated batteries according to claim 1, characterized in that: The AOI inspection machine also includes a linear motor module; the linear motor module includes a linear motor, a rubber-coated clamp is provided on the linear motor, and a large-surface positioning cylinder assembly and a narrow-surface positioning cylinder assembly are respectively provided on the end face and side face of the rubber-coated clamp.

6. The automatic six-side detection device for square film-coated batteries according to claim 1, characterized in that: The narrow surface detection vision module includes two first narrow surface 2.5D light sources, two second narrow surface 2.5D light sources and first and second narrow surface 2.5D line scan cameras; the two first narrow surface 2.5D light sources and the two second narrow surface 2.5D light sources are respectively arranged in a ring matrix, and the first and second narrow surface 2.5D line scan cameras are arranged on the sides of the two first narrow surface 2.5D light sources and the two second narrow surface 2.5D light sources.

7. The automatic six-side detection device for square film-coated batteries according to claim 1, characterized in that: The double-mover transport module comprises a first mover and a second mover; the first mover is connected to a Z-axis screw rod module, the Z-axis screw rod module is connected to a clamping claw cylinder; the second mover is connected to a Z-axis cylinder.

8. The automatic six-side detection device for square film-coated batteries according to claim 1, characterized in that: The top surface and large surface inspection visual module includes two symmetrically arranged first line scan cameras and two symmetrically arranged second line scan cameras; the top surface and large surface inspection visual module inspects the pole, explosion-proof valve and top patch area of ​​the product.

9. The automatic six-side detection device for square film-coated batteries according to claim 1, characterized in that: The NG material unloading and handling module comprises a conveyor belt line, and the side of the conveyor belt line is provided with a guide wheel that is close to the product.

10. The automatic six-side detection device for square film-coated batteries according to claim 1, characterized in that: The OK belt line has an anti-static belt; the OK belt line, NG belt line and re-investment belt line are all provided with rubber-coated bearings.

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