Online detection system and method for spring roll wrapper thickness and uniformity based on machine vision

Abstract

The present invention discloses a machine vision-based online detection system and method for the thickness and uniformity of spring roll wrappers, comprising: an inclined plate, the bottom and top ends of the inclined plate being fixedly connected to a straight plate, a transmission column being rotatably mounted between the inclined plate and the front and rear ends of the straight plate, a conveyor belt being sleeved between the two sets of transmission columns, the transmission column being fixedly connected to the output shaft of a reduction motor, the reduction motor being fixedly mounted on one end of the straight plate, a first mounting plate being fixedly mounted on one end of the straight plate, a purge mechanism being fixedly mounted on the upper surface of the first mounting plate, the purge end of the purge mechanism being overhead and covering the upper surface of the conveyor belt, and a splicing mechanism being fixedly mounted on both sides of the straight plate at the bottom. Through the design of the splicing mechanism and the purge mechanism, the present application achieves high-precision online detection of the thickness and flatness of spring roll wrappers through the combination of camera and laser displacement sensor technology, and automatically separates defective products from the products through intelligent computer analysis, thereby significantly improving production efficiency.

Description

Technical Field

[0001] The present invention relates to the field of machine vision technology, and in particular to a system and method for online detection of spring roll wrapper thickness and uniformity based on machine vision. Background Art

[0002] In the continuous production process of food processing, these foods will produce various appearance defects during the production process, so these foods must be inspected online to detect problems in time.

[0003] For example, the national authorized patent announcement number CN203203943U discloses a continuous product online inspection system based on machine vision, which includes an image collector for capturing images of the items to be inspected, a controller connected to the image collector, and a labeler or indicator connected to the controller. The controller is used to analyze the images captured by the image collector, and the labeler or indicator is used to affix labels or mark the corresponding positions of the defects on the items to be inspected when the controller detects defects. This ensures that all defects on the items to be inspected are detected, and the stability is much higher than that of manual inspection, improving product quality while saving labor costs.

[0004] However, the above-mentioned continuous product online inspection system based on machine vision cannot automatically blow the defective products off the production line and collect them in a centralized manner if the products are detected to have defects during the product inspection process. As a result, the defective products will continue to remain on the production line, causing further production problems, resulting in more waste in subsequent processes, and wasting materials and resources. Summary of the Invention

[0005] The purpose of the present invention is to provide an online detection system and method for spring roll wrapper thickness and uniformity based on machine vision, so as to solve the problem raised in the above background technology that if a product is detected to have defects during product inspection, the defective product cannot be automatically blown off the production line for centralized collection.

[0006] To achieve the above object, the present invention provides the following technical solutions:

[0007] The machine vision-based online detection system for spring roll wrap thickness and uniformity includes: an inclined plate, wherein the bottom and top ends of the inclined plate are fixedly connected to a straight plate, and the inclined plate and the straight plate are spliced ​​to form a Z shape. A transmission column is rotatably installed between the front and rear ends of the inclined plate and the straight plate, and a conveyor belt is installed between two sets of the transmission columns. The transmission column is fixedly connected to the output shaft of the reduction motor, and the reduction motor is fixedly installed at one end of the straight plate;

[0008] A first mounting plate is fixedly mounted on one end of the straight plate, a purge mechanism is fixedly mounted on the upper surface of the first mounting plate, and a purge end of the purge mechanism is overhead and covers the upper surface of the conveyor belt;

[0009] Among them, splicing mechanisms are fixedly installed on both sides of the straight plate at the bottom, so that the two groups of splicing mechanisms can be clamped toward the center synchronously, and the splicing mechanisms can be clamped at one end of another group of conveying equipment, so that the splicing mechanisms can splice the straight plate with the conveying equipment for conveying spring roll skins.

[0010] Preferably, limiting wheels are rotatably installed between the connection points of the inclined plate and the straight plates at both ends, so that the limiting wheels can limit and roll the conveyor belt into a Z shape formed by the inclined plate and the straight plates.

[0011] Preferably, a first C-shaped frame is fixedly installed on the upper surface between the two groups of inclined plates, and a camera is fixedly installed in the first C-shaped frame, so that the camera is flush with the inclination of the inclined plate, so that when the conveyor belt of the inclined segment transports the spring roll skin, the thickness surface of one side of the spring roll skin can be flush with the camera.

[0012] Preferably, a laser displacement sensor is fixedly mounted on the upper surface between the two groups of straight plates, and a laser emitting end of the laser displacement sensor is flush with a conveyor belt within the straight plates, so that the conveyor belt within the straight plates can convey the spring roll wrapper directly below the laser displacement sensor. The laser displacement sensor can calculate the distance to the spring roll wrapper by emitting a laser beam to the surface of the spring roll wrapper and measuring the reflected laser signal. The continuous conveyance of the conveyor belt can measure different sections of the spring roll wrapper, enabling the laser displacement sensor to detect height changes on the surface of the spring roll wrapper, thereby evaluating the flatness.

[0013] The model of the laser displacement sensor is optoNCDT 1320.

[0014] Preferably, the signal transmitting ends of the camera and the laser displacement sensor are connected to the signal receiving end of the computer, the computer is installed on the upper surface of the second mounting plate, and the second mounting plate is fixedly installed at one end of the straight plate. The computer is integrated with a Canny algorithm, which can obtain the thickness information of the spring roll skin through image acquisition for the camera, and use the Canny algorithm to extract the edge of the spring roll skin, and use the conversion relationship between pixels and actual size to calculate the thickness information of the spring roll skin.

[0015] Preferably, the purge mechanism includes a pneumatic pump, which is fixedly mounted on the upper surface of the first mounting plate. The blowing end of the pneumatic pump is connected to an air pipe, and the other end of the air pipe is connected to an air nozzle. The air nozzle passes through the straight plate and slides onto the upper surface of the conveyor belt. The pneumatic pump is also controlled by a computer.

[0016] Preferably, a covering cylinder is fixedly installed at one end of the air nozzle, so that the covering cylinder is suspended and mounted on the upper surface of the air nozzle and the conveyor belt. A storage cylinder is connected and installed at one end of the covering cylinder, and the storage cylinder is fixedly installed at one end of the straight plate. A material extraction port is opened at one end of the outer surface of the storage cylinder, and a sliding cover is slidably installed in the material extraction port.

[0017] Preferably, the splicing mechanism includes two groups of second C-shaped frames, which are fixedly mounted on both sides of the straight plate at the bottom, and the two groups of second C-shaped frames are rotatably mounted with a hydraulic rod, one end of the piston rod of the hydraulic rod is rotatably mounted with an H-shaped plate, and the other group of the H-shaped plates is rotatably mounted on one end of the second C-shaped frame, a connecting arm is fixedly mounted on one end of the H-shaped plate, and a top pressure pad is fixedly mounted on one end of the connecting arm.

[0018] Preferably, the two groups of hydraulic rods are controlled by a group of synchronization valves, so that the two groups of hydraulic rods can synchronously push the H-shaped plates to drive the top pressure pads to clamp toward the center synchronously.

[0019] The present invention also provides an online detection method for spring roll wrapper thickness and uniformity based on machine vision, which specifically includes the following steps:

[0020] S1: When testing the thickness and uniformity of spring roll wrappers, the spring roll wrapper conveyor can be connected to the straight plate at the bottom. Then, two sets of hydraulic rods can be simultaneously activated to push the H-shaped plate, which can drive the pressing pad to rotate at one end in the second U-shaped frame. The pressing pads at one end of the two sets of H-shaped plates can be simultaneously driven to press on both sides of the spring roll wrapper conveyor. The spring roll wrapper conveyor can be spliced ​​to one end of the straight plate at the bottom, and the spring roll wrapper conveyor can be transported to the conveyor belt of the straight plate.

[0021] S2: After the conveyor belt conveys the spring roll wrapper to the conveyor belt within the inclined plate segment and is flush with the camera lens, the camera can capture the thickness image of the spring roll wrapper side and analyze the edge of the spring roll wrapper using the Canny algorithm. Then, the actual spring roll wrapper thickness data is obtained by combining pixel and actual size conversion and sent to the computer, thus completing the thickness detection of the spring roll wrapper;

[0022] S3: As the conveyor belt transports the spring roll wrapper to the upper surface of the conveyor belt within the top straight section, the spring roll wrapper can move past the lower end of the laser displacement sensor, allowing the laser displacement sensor to calculate the distance to the spring roll wrapper by emitting a laser beam to the surface of the spring roll wrapper and measuring the reflected laser signal. The continuous conveyance of the conveyor belt allows measurements to be taken at different sections of the spring roll wrapper, allowing the laser displacement sensor to detect height changes on the surface of the spring roll wrapper and send the flatness information to a computer for the computer to evaluate the flatness of the spring roll wrapper.

[0023] S4: If the flatness of the spring roll wrapper does not meet the qualified standard, the computer controls the pneumatic pump to supply high-pressure gas to the air nozzle, so that the high-pressure gas can be blown to one end of the spring roll wrapper on the surface of the conveyor belt, so that the spring roll wrapper is guided by the covering cylinder into the storage cylinder for centralized storage.

[0024] Compared with the prior art, the present invention has the following beneficial effects:

[0025] 1. Through the design of conveyor belts, cameras, laser displacement sensors, computers, splicing mechanisms and purge mechanisms, when testing the thickness and uniformity of spring roll wrappers, the spring roll wrapper conveying equipment can be connected to the straight plate at the bottom, and then the two sets of splicing mechanisms can be synchronously started to press on both sides of the spring roll wrapper conveying equipment, so that the spring roll wrapper conveying equipment can be spliced ​​to one end of the straight plate at the bottom, and the spring roll wrapper conveying equipment can be conveyed to the straight plate conveyor belt, and then the spring roll wrapper conveying equipment can be conveyed to the conveyor belt. Then, as the conveyor belt conveys the spring roll wrapper to the conveyor belt in the inclined plate segment, it can be flush with the camera lens, and the camera can capture the thickness image of the side of the spring roll wrapper, and use the Canny algorithm to analyze the edge of the spring roll wrapper. Then, the actual spring roll wrapper thickness can be obtained by combining pixel and actual size conversion. The thickness data is collected and sent to the computer to complete the thickness detection of the spring roll wrapper. Subsequently, as the conveyor belt transports the spring roll wrapper to the upper surface of the conveyor belt in the top straight section, the spring roll wrapper can move past the lower end of the laser displacement sensor, so that the laser displacement sensor can emit a laser beam to the surface of the spring roll wrapper and measure the reflected laser signal to calculate the distance from the spring roll wrapper. The continuous transportation of the conveyor belt can measure different sections of the spring roll wrapper, and the laser displacement sensor can detect the height change of the spring roll wrapper surface and send the flatness information to the computer for the computer to evaluate the flatness of the spring roll wrapper. If the flatness of the spring roll wrapper does not meet the qualified standard, the computer controls the purge mechanism to blow high-pressure gas onto the surface of the conveyor belt, and the tested spring roll wrapper can be blown into the storage end of the purge mechanism for centralized storage.

[0026] In summary, the machine vision-based online inspection system for spring roll wrapper thickness and uniformity has the following core advantages:

[0027] 1. High-precision detection: Use cameras and laser displacement sensors to accurately measure thickness and flatness;

[0028] 2. Automated process: From transportation and testing to the handling of defective products, the entire process is automated to improve efficiency;

[0029] 3. Instant feedback mechanism: Computers analyze data in real time and respond quickly to ensure product quality;

[0030] 4. Data-driven improvement: Inspection data supports quality analysis and production optimization, promoting continuous improvement.

[0031] 2. Through the design of the pneumatic pump, air nozzle, covering cylinder, storage cylinder and sliding cover, after the spring roll wrapper passes the flatness detection of the laser displacement sensor and sends the flatness signal to the computer for flatness evaluation, if the flatness of the spring roll wrapper does not meet the qualified standard, the computer controls the pneumatic pump to supply high-pressure gas to the air nozzle, which can blow the high-pressure gas to one end of the spring roll wrapper on the surface of the conveyor belt, so that the spring roll wrapper is guided by the covering cylinder into the storage cylinder for centralized storage, thereby ensuring that only spring roll wrappers that meet the flatness standard enter the next production link, which can greatly reduce problems in subsequent processing and ensure the quality of the final product. In addition, through the cooperation of the laser displacement sensor and the computer system, automatic detection and removal of unqualified products are realized, eliminating manual intervention and improving the intelligence level of the production line. In addition, by blowing away unqualified spring roll wrappers, the integrity of the spring roll wrapper can be ensured, so that the staff can push open the sliding cover to take it out of the storage cylinder for observation, conduct quality analysis and improve processing equipment, which helps to continuously optimize the production process and improve the overall product quality.

[0032] 3. Through the design of the hydraulic rod, H-shaped plate, connecting arm and pressure pad, when the spring roll wrapper conveying equipment is connected to the straight plate at the bottom, the H-shaped plate can be pushed by starting the hydraulic rod, which can cause the H-shaped plate to drive the pressure pad to rotate at one end in the second U-shaped frame, and can simultaneously drive the pressure pads at one end of the two sets of H-shaped plates to press on both sides of the spring roll wrapper conveying equipment, so as to complete the connection of the spring roll wrapper conveying equipment with one end of the straight plate at the bottom. In addition, by synchronously driving the two sets of H-shaped plates and the pressure pad, the connection process can be completed quickly, reducing the time of equipment startup and pause. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 Schematic diagram of the overall structure of the online detection system for spring roll wrapper thickness and uniformity based on machine vision of the present invention;

[0034] Figure 2 It is a schematic structural diagram of the inclined plate and the computer of the present invention;

[0035] Figure 3 It is a structural schematic diagram of the limiting wheel of the present invention;

[0036] Figure 4 This is a schematic diagram of the structure of the camera of the present invention being flush with the inclined conveyor belt;

[0037] Figure 5 This is a schematic diagram of the structure of the air nozzle of the present invention slidingly attached to the surface of the conveyor belt;

[0038] Figure 6 It is a structural schematic diagram of the purge mechanism of the present invention;

[0039] Figure 7 It is a structural schematic diagram of the splicing mechanism of the present invention.

[0040] In the figure: 1. Straight plate; 101. Conveyor belt; 102. Reducer motor; 103. Inclined plate; 104. First U-shaped frame; 105. Camera; 106. Laser displacement sensor; 107. First mounting plate; 108. Second mounting plate; 109. Computer; 110. Limiting wheel; 111. Transmission column; 2. Splicing mechanism; 201. Hydraulic rod; 202. Second U-shaped frame; 203. H-shaped plate; 204. Connecting arm; 205. Top pressure pad; 3. Purge mechanism; 301. Pneumatic pump; 302. Air pipe; 303. Air nozzle; 304. Covering cylinder; 305. Storage cylinder; 306. Sliding cover; 307. Material taking port. DETAILED DESCRIPTION

[0041] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0042] See also Figure 1-Figure 7 , this embodiment provides the following technical solutions:

[0043] like Figure 1-Figure 4 As shown, a machine vision-based online detection system for spring roll wrapper thickness and uniformity includes: an inclined plate 103, with a straight plate 1 fixedly connected to the bottom and top ends of the inclined plate 103. The inclined plate 103 and the straight plate 1 are spliced ​​to form a Z shape. A transmission column 111 is rotatably installed between the front and rear ends of the inclined plate 103 and the straight plate 1. A conveyor belt 101 is installed between the two sets of transmission columns 111. The transmission column 111 is fixedly connected to the output shaft of the reduction motor 102, and the reduction motor 102 is fixedly installed at one end of the straight plate 1.

[0044] Among them, a first mounting plate 107 is fixedly mounted on one end of the straight plate 1, and a purge mechanism 3 is fixedly mounted on the upper surface of the first mounting plate 107. The purge end of the purge mechanism 3 is suspended and covers the upper surface of the conveyor belt 101;

[0045] Among them, splicing mechanisms 2 are fixedly installed on both sides of the straight plate 1 at the bottom, so that the two sets of splicing mechanisms 2 can be clamped toward the center synchronously, and the splicing mechanisms 2 can be clamped at one end of another set of conveying equipment, so that the straight plate 1 can be spliced ​​with the conveying equipment for conveying spring roll skins.

[0046] Limiting wheels 110 are rotatably installed between the connection points of the inclined plate 103 and the straight plates 1 at both ends, so that the limiting wheels 110 can limit and roll the conveyor belt 101 into a Z shape formed by the inclined plate 103 and the straight plates 1.

[0047] A first C-shaped frame 104 is fixedly installed on the upper surface between the two sets of inclined plates 103, and a camera 105 is fixedly installed inside the first C-shaped frame 104, so that the camera 105 is flush with the inclination of the inclined plate 103, so that when the inclined segment conveyor belt 101 transports the spring roll skin, the thickness surface of one side of the spring roll skin can be flush with the camera 105.

[0048] A laser displacement sensor 106 is fixedly mounted on the upper surface between the two sets of straight plates 1. The laser emitting end of the laser displacement sensor 106 is flush with the conveyor belt 101 within the straight plates 1, allowing the conveyor belt 101 within the straight plates 1 to convey the spring roll wrappers directly under the laser displacement sensor 106. The laser displacement sensor 106 can calculate the distance to the spring roll wrappers by emitting a laser beam to the surface of the spring roll wrappers and measuring the reflected laser signal. The continuous conveyance of the conveyor belt 101 allows measurements to be taken at different sections of the spring roll wrappers, allowing the laser displacement sensor 106 to detect changes in the height of the spring roll wrapper surface and thus assess its flatness.

[0049] The model of the laser displacement sensor 106 is optoNCDT 1320.

[0050] The signal transmitting ends of the camera 105 and the laser displacement sensor 106 are both connected to the signal receiving end of the computer 109. The computer 109 is installed on the upper surface of the second mounting plate 108, and the second mounting plate 108 is fixedly installed on one end of the straight board 1. The computer 109 is integrated with the Canny algorithm, which can obtain the thickness information of the spring roll wrapper through image acquisition for the camera 105, and use the Canny algorithm to extract the edge of the spring roll wrapper, and use the conversion relationship between pixels and actual size to calculate the thickness information of the spring roll wrapper.

[0051] Through the design of the conveyor belt 101, the camera 105, the laser displacement sensor 106, the computer 109, the splicing mechanism 2 and the purge mechanism 3, when testing the thickness and uniformity of the spring roll wrapper, the spring roll wrapper conveying device can be connected to the straight plate 1 at the bottom, and then the two sets of splicing mechanisms 2 can be started synchronously to press on both sides of the spring roll wrapper conveying device, so that the spring roll wrapper conveying device can be spliced ​​to one end of the straight plate 1 at the bottom, and the spring roll wrapper conveying device can convey the spring roll wrapper to the conveyor belt 101 of the straight plate 1, and the spring roll wrapper conveying device can convey the spring roll wrapper to the conveyor belt 101 of the straight plate 1. Then, as the conveyor belt 101 conveys the spring roll wrapper to the conveyor belt 101 within the inclined plate 103 segment, it can be flush with the lens of the camera 105, and the camera 105 can capture the thickness image of the side of the spring roll wrapper, and use the Canny algorithm to analyze the edge line of the spring roll wrapper. Then, the actual spring roll wrapper can be obtained by combining the pixel and actual size conversion. The thickness data is collected and sent to the computer 109, thereby completing the thickness detection of the spring roll wrapper. Subsequently, as the conveyor belt 101 conveys the spring roll wrapper to the upper surface of the conveyor belt 101 within the top straight plate 1 segment, the spring roll wrapper can move past the lower end of the laser displacement sensor 106, so that the laser displacement sensor 106 can emit a laser beam to the surface of the spring roll wrapper and measure the reflected laser signal to calculate the distance from the spring roll wrapper. The continuous conveyance of the conveyor belt 101 can measure different sections of the spring roll wrapper, and the laser displacement sensor 106 can detect the height change of the spring roll wrapper surface and send the flatness information to the computer 109 for the computer 109 to evaluate the flatness of the spring roll wrapper. If the flatness of the spring roll wrapper does not meet the qualified standard, the computer 109 controls the purge mechanism 3 to blow high-pressure gas onto the surface of the conveyor belt 101, so that the tested spring roll wrapper can be blown into the storage end of the purge mechanism 3 for centralized storage.

[0052] In summary, the machine vision-based online inspection system for spring roll wrapper thickness and uniformity has the following core advantages:

[0053] 1. High-precision detection: Use camera 105 and laser displacement sensor 106 to accurately measure thickness and flatness;

[0054] 2. Automated process: From transportation and testing to the handling of defective products, the entire process is automated to improve efficiency;

[0055] 3. Instant feedback mechanism: Computer 109 analyzes data in real time and responds quickly to ensure product quality;

[0056] 4. Data-driven improvement: Inspection data supports quality analysis and production optimization, promoting continuous improvement.

[0057] like Figure 5-Figure 6As shown, the purge mechanism 3 includes a pneumatic pump 301, which is fixedly mounted on the upper surface of the first mounting plate 107. The blowing end of the pneumatic pump 301 is connected to an air pipe 302, and the other end of the air pipe 302 is connected to an air nozzle 303. The air nozzle 303 passes through the straight plate 1 and slides onto the upper surface of the conveyor belt 101. The pneumatic pump 301 is also controlled by the computer 109.

[0058] A covering cylinder 304 is fixedly installed at one end of the air nozzle 303, so that the covering cylinder 304 is suspended and mounted on the upper surface of the air nozzle 303 and the conveyor belt 101. A storage cylinder 305 is installed at one end of the covering cylinder 304. The storage cylinder 305 is fixedly installed at one end of the straight plate 1. A material extraction port 307 is opened at one end of the outer surface of the storage cylinder 305, and a sliding cover 306 is slidably installed in the material extraction port 307.

[0059] Through the design of the pneumatic pump 301, the air nozzle 303, the covering cylinder 304, the storage cylinder 305 and the sliding cover 306, after the spring roll wrapper passes the flatness detection of the laser displacement sensor 106 and sends the flatness signal to the computer 109 for flatness evaluation, if the flatness of the spring roll wrapper does not pass the qualified standard, the computer 109 controls the pneumatic pump 301 to supply high-pressure gas to the air nozzle 303, so that the high-pressure gas can be blown to one end of the spring roll wrapper on the surface of the conveyor belt 101, so that the spring roll wrapper is guided by the covering cylinder 304 into the storage cylinder 305 for centralized storage, thereby ensuring that only the spring roll wrapper that meets the flatness standard is The spring roll wrappers of the present invention can enter the next production link, which can greatly reduce the problems that occur in the subsequent processing and ensure the quality of the final product. In addition, through the cooperation of the laser displacement sensor 106 and the computer 109 system, automatic detection and removal of unqualified products can be achieved, eliminating manual intervention and improving the intelligence level of the production line. In addition, the integrity of the spring roll wrappers can be ensured by blowing away the unqualified spring roll wrappers, so that the staff can push open the sliding cover 306 and take them out of the storage cylinder 305 for observation, conduct quality analysis and improve the processing equipment, which is conducive to continuously optimizing the production process and improving the overall product quality.

[0060] like Figure 7 As shown, the splicing mechanism 2 includes two groups of second C-shaped frames 202, which are fixedly mounted on both sides of the straight plate 1 at the bottom. The two groups of second C-shaped frames 202 are rotatably mounted with a hydraulic rod 201, and one end of the piston rod of the hydraulic rod 201 is rotatably mounted with an H-shaped plate 203. Another group of H-shaped plates 203 is rotatably mounted on one end of the second C-shaped frame 202, and a connecting arm 204 is fixedly mounted on one end of the H-shaped plate 203, and a top pressure pad 205 is fixedly mounted on one end of the connecting arm 204.

[0061] The two groups of hydraulic rods 201 are controlled by a group of synchronous valves so that the two groups of hydraulic rods 201 can synchronously push the H-shaped plate 203 to drive the top pressure pad 205 to clamp toward the center synchronously.

[0062] Through the design of the hydraulic rod 201, H-shaped plate 203, connecting arm 204 and pressing pad 205, when the spring roll wrapper conveying equipment is connected to the straight plate 1 at the bottom, the H-shaped plate 203 can be pushed by starting the hydraulic rod 201, so that the H-shaped plate 203 can drive the pressing pad 205 to rotate at one end in the second U-shaped frame 202, and can synchronously drive the pressing pads 205 at one end of the two groups of H-shaped plates 203 to press on both sides of the spring roll wrapper conveying equipment, so as to complete the connection of the spring roll wrapper conveying equipment with one end of the straight plate 1 at the bottom. In addition, through the design of synchronously driving the two groups of H-shaped plates 203 and the pressing pad 205, the connection process can be completed quickly, reducing the time for starting and stopping the equipment.

[0063] The present invention also provides an online detection method for spring roll wrapper thickness and uniformity based on machine vision, which specifically includes the following steps:

[0064] S1: When testing the thickness and uniformity of spring roll wrappers, the spring roll wrapper conveyor can be connected to the straight plate 1 at the bottom. Then, two sets of hydraulic rods 201 can be synchronously activated to push the H-shaped plate 203, which can cause the H-shaped plate 203 to drive the pressing pad 205 to rotate at one end inside the second U-shaped frame 202. The pressing pads 205 at one end of the two sets of H-shaped plates 203 can be synchronously driven to press on both sides of the spring roll wrapper conveyor. The spring roll wrapper conveyor can be spliced ​​to one end of the straight plate 1 at the bottom, so that the spring roll wrapper conveyor can convey the spring roll wrappers to the conveyor belt 101 of the straight plate 1;

[0065] S2: After the conveyor belt 101 conveys the spring roll wrapper to the conveyor belt 101 within the inclined plate 103 section, it is aligned with the lens of the camera 105. The camera 105 then captures a thickness image of the spring roll wrapper side surface and uses the Canny algorithm to analyze the edge of the spring roll wrapper. The actual thickness data of the spring roll wrapper is then obtained by combining pixel and actual size conversion and sent to the computer 109, thereby completing the thickness detection of the spring roll wrapper.

[0066] S3: After the conveyor belt 101 conveys the spring roll wrapper to the upper surface of the conveyor belt 101 within the top straight plate 1 segment, the spring roll wrapper can move past the lower end of the laser displacement sensor 106, so that the laser displacement sensor 106 can calculate the distance to the spring roll wrapper by emitting a laser beam to the surface of the spring roll wrapper and measuring the reflected laser signal. The continuous conveyance of the conveyor belt 101 can measure different segments of the spring roll wrapper, and the laser displacement sensor 106 can detect the height change of the spring roll wrapper surface and send the flatness information to the computer 109 for the computer 109 to evaluate the flatness of the spring roll wrapper.

[0067] S4: If the flatness of the spring roll wrapper does not meet the qualification standard, the computer 109 controls the pneumatic pump 301 to supply high-pressure gas to the air nozzle 303, so that the high-pressure gas can be blown to one end of the spring roll wrapper on the surface of the conveyor belt 101, so that the spring roll wrapper is guided by the covering cylinder 304 into the storage cylinder 305 for centralized storage.

[0068] In the online detection system for spring roll wrap thickness and uniformity based on machine vision, the specific application of the Canny algorithm is as follows:

[0069] Image preprocessing: Use Gaussian filtering to smooth the input spring roll wrapper image to reduce noise interference.

[0070] Gradient calculation: Calculate the gradient strength and direction of the smoothed image for subsequent edge detection.

[0071] Non-maximum suppression: refines the edges in the gradient image and removes unnecessary details.

[0072] Double threshold detection: A double threshold strategy is applied to extract the strong edges and possible weak edges of the spring roll wrapper.

[0073] Edge tracing: Connect weak edges to form a complete spring roll wrapper edge outline.

[0074] Finally, the edge contours extracted by the Canny algorithm can be used to calculate the thickness of the spring roll wrapper. Combined with the conversion relationship between pixels and actual size (for example, calibration based on known image resolution and actual object size), the thickness of the spring roll wrapper can be accurately calculated and sent to a computer for further analysis and processing.

[0075] In summary, the Canny algorithm plays a key role in the online detection system for spring roll wrap thickness and uniformity based on machine vision. Through high-precision edge detection, it provides a reliable basis for subsequent thickness calculation and uniformity evaluation.

[0076] According to the above technical solution, the working steps of this solution are summarized and sorted out: when testing the thickness and uniformity of the spring roll wrapper, the spring roll wrapper conveying equipment can be connected to the straight plate 1 at the bottom, and then the two sets of hydraulic rods 201 can be synchronously started to push the H-shaped plate 203, which can make the H-shaped plate 203 drive the top pressure pad 205 to rotate at one end in the second U-shaped frame 202, and can synchronously drive the top pressure pad 205 at one end of the two sets of H-shaped plates 203 to press on both sides of the spring roll wrapper conveying equipment, so as to splice the spring roll wrapper conveying equipment at At one end of the straight plate 1 at the bottom, the spring roll wrapper conveying device can convey the spring roll wrapper to the conveyor belt 101 of the straight plate 1. Then, as the conveyor belt 101 conveys the spring roll wrapper to the conveyor belt 101 in the inclined plate 103 segment, it can be flush with the lens of the camera 105, and the camera 105 can capture the thickness image of the side of the spring roll wrapper and use the Canny algorithm to analyze the edge line of the spring roll wrapper. Then, the actual spring roll wrapper thickness data can be obtained by combining the pixel and actual size conversion and sent to the computer 109. After the thickness of the spring roll wrapper is tested, the conveyor belt 101 conveys the spring roll wrapper to the upper surface of the conveyor belt 101 within the top straight plate 1 segment, whereupon the spring roll wrapper moves past the lower end of the laser displacement sensor 106. The laser displacement sensor 106 emits a laser beam to the surface of the spring roll wrapper and measures the reflected laser signal to calculate the distance to the spring roll wrapper. The continuous conveyance of the conveyor belt 101 allows measurements to be taken at different sections of the spring roll wrapper, enabling the laser displacement sensor 106 to detect height changes on the surface of the spring roll wrapper and transmit the flatness information to the computer 109 for evaluation of the flatness of the spring roll wrapper. If the flatness of the spring roll wrapper does not meet the qualified standard, the computer 109 controls the pneumatic pump 301 to supply high-pressure gas to the air nozzle 303, which blows the high-pressure gas to one end of the spring roll wrapper on the surface of the conveyor belt 101, directing the spring roll wrapper by the covering cylinder 304 into the storage cylinder 305 for centralized storage, thereby ensuring that only spring roll wrappers that meet the flatness standard enter the next production link.

[0077] In summary: through the combination of camera 105 and laser displacement sensor 106 technology, high-precision online detection of the thickness and flatness of spring roll wrappers is achieved, and through intelligent analysis by computer 109, unqualified products are automatically separated, which greatly improves production efficiency and ensures product quality. The entire process is efficient and accurate, greatly improving the production efficiency and quality control level of spring roll wrappers.

[0078] Parts not described in the present invention are the same as those in the prior art or can be implemented using the prior art. Although the embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations may be made to these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. The online detection system for spring roll wrapper thickness and uniformity based on machine vision is characterized by: include: Inclined plate, the bottom and top ends of the inclined plate are fixedly connected with straight plates, the inclined plate and the straight plate are spliced ​​to form a Z shape, a transmission column is rotatably installed between the head and tail ends of the inclined plate and the straight plate, a conveyor belt is set between the two sets of transmission columns, the transmission column is fixedly connected to the output shaft of the reduction motor, and the reduction motor is fixedly installed at one end of the straight plate; a first mounting plate is fixedly installed at one end of the straight plate, a purge mechanism is fixedly installed on the upper surface of the first mounting plate, and the purge end of the purge mechanism is overhead and covers the upper surface of the conveyor belt; the straight plate at the bottom A splicing mechanism is fixedly installed on both sides, so that the two sets of splicing mechanisms can be clamped toward the center synchronously, and the splicing mechanism can be clamped on one end of the other set of conveying equipment, so that the splicing mechanism can splice the straight plate with the conveying equipment for conveying spring roll skins; a first C-shaped frame is fixedly installed on the upper surface between the two sets of inclined plates, and a camera is fixedly installed in the first C-shaped frame, so that the camera is flush with the inclination of the inclined plate, and thus, when the inclined segment conveyor belt conveys the spring roll skins, the thickness surface of one side of the spring roll skins can be flush with the camera; The purge mechanism includes a pneumatic pump, which is fixedly mounted on the upper surface of the first mounting plate. An air pipe is connected to the blowing end of the pneumatic pump, and an air nozzle is connected to the other end of the air pipe. The air nozzle passes through the straight plate and slides to fit the upper surface of the conveyor belt. The pneumatic pump is also controlled by a computer. A covering cylinder is fixedly mounted on one end of the air nozzle, so that the covering cylinder is overhead and sleeved between the air nozzle and the upper surface of the conveyor belt. A storage cylinder is connected to one end of the covering cylinder, which is fixedly mounted on one end of the straight plate. A material taking port is opened at one end of the outer surface of the storage cylinder, and a sliding cover is slidably mounted in the material taking port. The online detection method of the spring roll wrapper thickness and uniformity online detection system based on machine vision specifically includes the following steps: S1: When testing the thickness and uniformity of spring roll wrappers, the spring roll wrapper conveyor is connected to the straight plate at the bottom. Then, two sets of hydraulic rods are simultaneously activated to push the H-shaped plate, which can drive the pressing pad at one end of the second U-shaped frame to rotate. The pressing pads at one end of the two sets of H-shaped plates can be simultaneously driven to press on both sides of the spring roll wrapper conveyor. The spring roll wrapper conveyor can be spliced ​​to one end of the straight plate at the bottom, so that the spring roll wrapper conveyor can convey the spring roll wrapper to the conveyor belt of the straight plate; S2: After the conveyor belt conveys the spring roll wrapper to the conveyor belt within the inclined plate segment and is flush with the camera lens, the camera can capture the thickness image of the spring roll wrapper side and use the Canny algorithm to analyze the edge line of the spring roll wrapper. Then, the actual spring roll wrapper thickness data is obtained by combining pixel and actual size conversion and sent to the computer, thus completing the thickness detection of the spring roll wrapper; S3: As the conveyor belt transports the spring roll wrapper to the upper surface of the conveyor belt within the top straight section, the spring roll wrapper can move past the lower end of the laser displacement sensor, allowing the laser displacement sensor to calculate the distance to the spring roll wrapper by emitting a laser beam to the surface of the spring roll wrapper and measuring the reflected laser signal. The continuous conveyance of the conveyor belt allows measurements to be taken at different sections of the spring roll wrapper, allowing the laser displacement sensor to detect height changes on the surface of the spring roll wrapper and send the flatness information to a computer for the computer to evaluate the flatness of the spring roll wrapper. S4: If the flatness of the spring roll wrapper does not meet the qualified standard, the computer controls the pneumatic pump to supply high-pressure gas to the air nozzle, so that the high-pressure gas can be blown to one end of the spring roll wrapper on the surface of the conveyor belt, so that the spring roll wrapper is guided by the covering cylinder into the storage cylinder for centralized storage.

2. The machine vision-based online detection system for spring roll wrapper thickness and uniformity according to claim 1, characterized in that: Limiting wheels are rotatably installed between the connection points of the inclined plate and the straight plates at both ends, so that the limiting wheels can limit and roll the conveyor belt into a Z shape formed by the inclined plate and the straight plates.

3. The machine vision-based online detection system for spring roll wrapper thickness and uniformity according to claim 2, characterized in that: A laser displacement sensor is fixedly installed on the upper surface between the two groups of straight plates. The laser emitting end of the laser displacement sensor is flush with the conveyor belt in the straight plate, so that the conveyor belt in the straight plate can convey the spring roll skin from directly under the laser displacement sensor, so that the laser displacement sensor can calculate the distance to the spring roll skin by emitting a laser beam to the surface of the spring roll skin and measuring the reflected laser signal. The continuous transportation of the conveyor belt can measure different segments of the spring roll skin, and the laser displacement sensor can detect the height change of the spring roll skin surface, thereby evaluating the flatness.

4. The machine vision-based online detection system for spring roll wrapper thickness and uniformity according to claim 3, characterized in that: The signal transmitting ends of the camera and the laser displacement sensor are both connected to the signal receiving end of the computer. The computer is installed on the upper surface of the second mounting plate, and the second mounting plate is fixedly installed at one end of the straight board. The computer is integrated with a Canny algorithm, which can obtain the thickness information of the spring roll wrapper through image acquisition by the camera, and use the Canny algorithm to extract the edge of the spring roll wrapper, and use the conversion relationship between pixels and actual size to calculate the thickness information of the spring roll wrapper.

5. The machine vision-based online detection system for spring roll wrapper thickness and uniformity according to claim 1, characterized in that: The splicing mechanism includes two groups of second C-shaped frames, which are fixedly mounted on both sides of the straight plate at the bottom. A hydraulic rod is rotatably mounted inside the two groups of second C-shaped frames, and an H-shaped plate is rotatably mounted on one end of the piston rod of the hydraulic rod. Another group of the H-shaped plates is rotatably mounted on one end inside the second C-shaped frame. A connecting arm is fixedly mounted on one end of the H-shaped plate, and a top pressure pad is fixedly mounted on one end of the connecting arm.

6. The machine vision-based online detection system for spring roll wrapper thickness and uniformity according to claim 5, characterized in that: The two groups of hydraulic rods are controlled by a group of synchronous valves so that the two groups of hydraulic rods can synchronously push the H-shaped plates to drive the top pressure pads to clamp toward the center synchronously.

7. A machine vision-based online detection method for spring roll wrapper thickness and uniformity, characterized by: Includes steps S1-S4 in claim 1.

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