Spring roll wrapper thickness and uniformity online detection system and method based on machine vision

Abstract

The machine vision-based spring roll wrapper thickness and uniformity online detection system comprises an inclined plate, straight plates are fixedly connected to one end of the bottom and one end of the top of the inclined plate, transmission columns are rotatably mounted between the head ends and the tail ends of the inclined plate and the straight plates, and a conveying belt is mounted between the two transmission columns in a sleeving manner; the transmission column is fixedly connected with an output shaft of a gear motor, the gear motor is fixedly mounted at one end of a straight plate, a first mounting plate is fixedly mounted at one end of the straight plate, a blowing mechanism is fixedly mounted on the upper surface of the first mounting plate, and the blowing end of the blowing mechanism covers the upper surface of the conveying belt in an overhead mode. Splicing mechanisms are fixedly installed on the two sides of the straight plate located at the bottom. Through the design of the splicing mechanism and the purging mechanism, high-precision online detection of the thickness and flatness of the spring roll wrapper is realized through the combination of a camera and a laser displacement sensor technology, and the production efficiency is greatly improved through intelligent analysis of a computer and automatic separation of unqualified products.

Description

Technical Field

[0001] The present invention relates to the technical field of machine vision, 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 patent with the national authorized patent announcement number CN203203943U discloses a continuous product online inspection system based on machine vision, including an image collector for collecting images of the inspected items, a controller connected to the image collector, and a labeler or indicator connected to the controller, wherein the controller is used to analyze the images collected by the image collector, and the labeler or indicator is used to label or mark the corresponding position of the defects of the inspected items when the controller detects defects. It can ensure that all defects of the inspected items are detected, and the stability is much higher than manual inspection, which improves the quality of the products and saves labor costs.

[0004] However, in the above-mentioned continuous product online inspection system based on machine vision, if a product is detected to be defective during the product inspection process, the defective product cannot be automatically blown off the production line for collection, which will cause the defective product to 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 wrap 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 products 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 online detection system for thickness and uniformity of spring roll wrapper based on machine vision comprises: an inclined plate, the bottom and one end of the top of the inclined plate are fixedly connected with a straight plate, 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, a conveyor belt is set between two groups 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] Wherein, 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 suspended 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 installed on the upper surface between the two groups of straight plates, and 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 below the laser displacement sensor, so that the laser displacement sensor can calculate the distance from the spring roll skin by emitting a laser beam to the surface of the spring roll skin and measuring the reflected laser signal. Different sections of the spring roll skin can be measured by the continuous conveyance of the conveyor belt, so that the laser displacement sensor can detect the height change of the surface of the spring roll skin, thereby evaluating the flatness;

[0013] Wherein, 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 on 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 by 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, which 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.

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

[0017] Preferably, the splicing mechanism includes two groups of second C-shaped frames, the two groups of second C-shaped frames are fixedly mounted on both sides of the straight plate at the bottom, 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, the other group of the H-shaped plates is rotatably mounted at one end inside the second C-shaped frames, a connecting arm is fixedly mounted at one end of the H-shaped plate, and a top pressure pad is fixedly mounted at 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 plate to drive the top pressure pad to clamp toward the center synchronously.

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

[0020] S1: When testing the thickness and uniformity of the spring roll skin, the conveying device of the spring roll skin can be connected to the straight plate at the bottom, and then two sets of hydraulic rods can be synchronously started to push the H-shaped plate, so that the H-shaped plate can drive the top pressure pad to rotate at one end in the second U-shaped frame, and the top pressure pads at one end of the two sets of H-shaped plates can be synchronously driven to press on both sides of the spring roll skin conveying device, and the spring roll skin conveying device can be spliced ​​to one end of the straight plate at the bottom, so that the spring roll skin conveying device can convey the spring roll skin to the conveyor belt of the straight plate;

[0021] S2: After the conveyor belt conveys the spring roll skin 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 spring roll skin side, and use the Canny algorithm to analyze the edge of the spring roll skin. Then, the actual spring roll skin thickness data can be obtained by combining pixel and actual size conversion and sent to the computer, thus completing the thickness detection of the spring roll skin;

[0022] S3: Then, as the conveyor belt conveys the spring roll skin to the upper surface of the conveyor belt in the top straight plate segment, the spring roll skin can move past the lower end of the laser displacement sensor, so that the laser displacement sensor can calculate the distance from 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 conveyance of the conveyor belt can measure different segments of the spring roll skin, so that the laser displacement sensor can detect the height change of the surface of the spring roll skin and send the flatness information to the computer for the computer to evaluate the flatness of the spring roll skin.

[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 belt, camera, laser displacement sensor, computer, splicing mechanism and purge mechanism, when testing the thickness and uniformity of spring roll skin, the conveying equipment of spring roll skin can be connected to the straight plate at the bottom, and then the two sets of splicing mechanisms can be started synchronously to press on both sides of the spring roll skin conveying equipment, so that the spring roll skin conveying equipment can be spliced ​​to one end of the straight plate at the bottom, and the spring roll skin conveying equipment can convey the spring roll skin to the conveyor belt of the straight plate, and then the spring roll skin conveying equipment can convey the spring roll skin to the conveyor belt in the inclined plate segment. After that, the conveyor belt can be flush with the lens of the camera, and the thickness image of the side of the spring roll skin can be captured by the camera, and the edge line of the spring roll skin can be analyzed by using the Canny algorithm. Then, the actual thickness of the spring roll skin can be obtained by combining the pixel and actual size conversion. The thickness data is sent to the computer, and the thickness detection of the spring roll skin is completed. Then, as the conveyor belt conveys the spring roll skin to the upper surface of the conveyor belt in the top straight plate segment, the spring roll skin can move from the lower end of the laser displacement sensor, so that the laser displacement sensor can calculate the distance from 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 conveyance of the conveyor belt can measure different sections of the spring roll skin, and the laser displacement sensor can detect the height change of the surface of the spring roll skin and send the flatness information to the computer for the computer to evaluate the flatness of the spring roll skin. If the flatness of the spring roll skin does not pass 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 skin can be purged into the storage end of the purge mechanism for centralized storage.

[0026] In summary, the online detection system for spring roll wrap thickness and uniformity based on machine vision 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, testing to handling of defective products, the whole 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 skin 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 skin does not pass 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 skin on the surface of the conveyor belt, so that the spring roll skin is guided by the covering cylinder into the storage cylinder for centralized storage, thereby ensuring that only spring roll skin that meets the flatness standard enters the next production link, which can greatly reduce the problems that arise 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 can be achieved, eliminating manual intervention and improving the intelligence level of the production line. In addition, the integrity of the spring roll skin can be ensured by blowing and removing unqualified spring roll skin, so that the staff can push open the sliding cover and take it out of the storage cylinder for observation, conduct quality analysis and improve processing equipment, which is conducive to continuously optimizing the production process and improving the overall product quality.

[0032] 3. Through the design of hydraulic rod, H-shaped plate, connecting arm and top pressure pad, when the spring roll skin conveying equipment is connected with the straight plate at the bottom, the H-shaped plate can be pushed by starting the hydraulic rod, so that the H-shaped plate can drive the top pressure pad to rotate at one end in the second U-shaped frame, and can synchronously drive the top pressure pads at one end of the two groups of H-shaped plates to press on both sides of the spring roll skin conveying equipment, so that the spring roll skin conveying equipment can be connected to one end of the straight plate at the bottom. Moreover, through the design of synchronously driving the two groups of H-shaped plates and the top 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 The figure is a schematic diagram of the overall structure of the online detection system for spring roll wrap thickness and uniformity based on machine vision of the present invention;

[0034] Figure 2 It is a structural schematic 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 It is a schematic diagram of the structure in which the camera of the present invention is flush with the inclined conveyor belt;

[0037] Figure 5 It is a schematic diagram of the structure of the air nozzle of the present invention being slidably 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. reduction 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. limit 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 be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. 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 creative work 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 spring roll wrap thickness and uniformity online detection system based on machine vision includes: an inclined plate 103, the bottom and one end of the top of the inclined plate 103 are fixedly connected to a straight plate 1, 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 head and tail ends of the inclined plate 103 and the straight plate 1, a conveyor belt 101 is set between 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, a purge mechanism 3 is fixedly mounted on the upper surface of the first mounting plate 107, and a 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 groups 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 conveys 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 installed on the upper surface between the two groups of straight plates 1. The laser emitting end of the laser displacement sensor 106 is flush with the conveyor belt 101 in the straight plate 1, so that the conveyor belt 101 in the straight plate 1 can convey the spring roll skin from directly below the laser displacement sensor 106, so that the laser displacement sensor 106 can calculate the distance from the spring roll skin by emitting a laser beam to the surface of the spring roll skin and measuring the reflected laser signal. Different sections of the spring roll skin can be measured by the continuous conveyance of the conveyor belt 101, so that the laser displacement sensor 106 can detect the height change of the surface of the spring roll skin, thereby evaluating the 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 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 plate 1. The computer 109 is integrated with the Canny algorithm, which can obtain the thickness information of the spring roll skin through image acquisition for the camera 105, and use the Canny algorithm to extract the edge of the spring roll skin, and use the conversion relationship between pixels and actual sizes to calculate the thickness information of the spring roll skin.

[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 purging mechanism 3, when the thickness and uniformity of the spring roll skin are detected, the conveying equipment of the spring roll skin 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 skin conveying equipment, so that the spring roll skin conveying equipment can be spliced ​​to one end of the straight plate 1 at the bottom, and the spring roll skin conveying equipment can convey the spring roll skin to the conveyor belt 101 of the straight plate 1, and the spring roll skin conveying equipment can convey the spring roll skin to the conveyor belt 101 of the straight plate 1, and then as the conveyor belt 101 conveys the spring roll skin to the conveyor belt 101 in the inclined plate 103 segment, it can be flush with the lens of the camera 105, and the thickness image of the side of the spring roll skin can be captured by the camera 105, and the edge line of the spring roll skin can be analyzed by using the Canny algorithm, and then the actual spring roll skin can be obtained by combining the pixel and actual size conversion. The thickness data is sent to the computer 109, and the thickness detection of the spring roll skin is completed. Then, as the conveyor belt 101 conveys the spring roll skin to the upper surface of the conveyor belt 101 in the top straight plate 1 segment, the spring roll skin can move from the lower end of the laser displacement sensor 106, so that the laser displacement sensor 106 can calculate the distance from 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 conveyance of the conveyor belt 101 can measure different sections of the spring roll skin, and the laser displacement sensor 106 can detect the height change of the surface of the spring roll skin and send the flatness information to the computer 109 for the computer 109 to evaluate the flatness of the spring roll skin. If the flatness of the spring roll skin does not pass 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 detected spring roll skin can be purged into the storage end of the purge mechanism 3 for centralized storage;

[0052] In summary, the online detection system for spring roll wrap thickness and uniformity based on machine vision has the following core advantages:

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

[0054] 2. Automated process: From transportation, testing to handling of defective products, the whole 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 to fit on 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 overhead mounted on the upper surface of the air nozzle 303 and the conveyor belt 101, and a storage cylinder 305 is installed at one end of the covering cylinder 304, and 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 skin 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 skin 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 skin on the surface of the conveyor belt 101, so that the spring roll skin is guided by the covering cylinder 304 into the storage cylinder 305 for centralized storage, thereby ensuring that only the spring roll skin that meets the flatness standard The spring roll wrappers enter the next production link, which can greatly reduce the problems that occur in 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 it out of the storage cylinder 305 for observation, conduct quality analysis and improve the processing equipment, which is helpful to continuously optimize the production process and improve the overall product quality.

[0060] like Figure 7 As shown, the splicing mechanism 2 includes two groups of second C-shaped frames 202, and the two groups of second C-shaped frames 202 are fixedly installed on both sides of the straight plate 1 at the bottom. The two groups of second C-shaped frames 202 are rotatably installed with hydraulic rods 201, and one end of the piston rod of the hydraulic rod 201 is rotatably installed with an H-shaped plate 203, and the other group of H-shaped plates 203 is rotatably installed at one end of the second C-shaped frames 202, and a connecting arm 204 is fixedly installed at one end of the H-shaped plate 203, and a top pressure pad 205 is fixedly installed at 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, the H-shaped plate 203, the connecting arm 204 and the pressing pad 205, when the spring roll skin 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 skin conveying equipment, so that the spring roll skin conveying equipment can be connected to 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 wrap thickness and uniformity based on machine vision, which specifically comprises the following steps:

[0064] S1: When testing the thickness and uniformity of the spring roll skin, the conveying device of the spring roll skin can be connected to the straight plate 1 at the bottom, and then the two groups of hydraulic rods 201 can be synchronously started to push the H-shaped plate 203, so that the H-shaped plate 203 can 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 pads 205 at one end of the two groups of H-shaped plates 203 to press on both sides of the spring roll skin conveying device, so that the spring roll skin conveying device can be spliced ​​to one end of the straight plate 1 at the bottom, and the spring roll skin conveying device can convey the spring roll skin to the conveyor belt 101 of the straight plate 1;

[0065] S2: After the conveyor belt 101 conveys the spring roll skin 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 skin, and use the Canny algorithm to analyze the edge of the spring roll skin. Then, the actual thickness data of the spring roll skin can be obtained by combining the pixel and the actual size conversion and sent to the computer 109, so as to complete the thickness detection of the spring roll skin;

[0066] S3: Then, as the conveyor belt 101 conveys the spring roll skin to the upper surface of the conveyor belt 101 in the top straight plate 1 segment, the spring roll skin 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 skin by emitting a laser beam to the surface of the spring roll skin and measuring the reflected laser signal. The continuous conveyance of the conveyor belt 101 can measure different segments of the spring roll skin, so that the laser displacement sensor 106 can detect the height change of the surface of the spring roll skin and send the flatness information to the computer 109, so that the computer 109 can evaluate the flatness of the spring roll skin.

[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 of spring roll wrap thickness and uniformity based on machine vision, the specific application of Canny algorithm is as follows:

[0069] Image preprocessing: Use Gaussian filtering to smooth the input spring roll skin image and 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 contour 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, calibrated by known image resolution and actual object size), the thickness of the spring roll wrapper can be accurately calculated and sent to the computer for further analysis and processing.

[0075] In summary, the Canny algorithm plays a key role in the online detection system of 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 scheme, the working steps of this scheme are summarized and sorted out: when the thickness and uniformity of the spring roll skin are detected, the conveying equipment of the spring roll skin can be connected to the straight plate 1 at the bottom, and then the two groups of hydraulic rods 201 can be synchronously started to push the H-shaped plate 203, so that the H-shaped plate 203 can 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 pads 205 at one end of the two groups of H-shaped plates 203 to press on both sides of the spring roll skin conveying equipment, so that the spring roll skin conveying equipment can be spliced ​​at At one end of the straight plate 1 at the bottom, the spring roll skin conveying device can convey the spring roll skin to the conveyor belt 101 of the straight plate 1, and then as the conveyor belt 101 conveys the spring roll skin 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 skin, and use the Canny algorithm to analyze the edge of the spring roll skin, and then combine the pixel and actual size conversion to obtain the actual spring roll skin thickness data and send it to the computer 109, After the thickness detection of the spring roll skin is completed, as the conveyor belt 101 transports the spring roll skin to the upper surface of the conveyor belt 101 in the top straight plate 1 segment, the spring roll skin can move past the lower end of the laser displacement sensor 106, so that the laser displacement sensor 106 can calculate the distance from 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 101 can measure different segments of the spring roll skin, so that the laser displacement sensor 106 can detect the height change of the surface of the spring roll skin and send the flatness information to the computer 109 for the computer 109 to evaluate the flatness of the spring roll skin. If the flatness of the spring roll skin does not meet 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 skin on the surface of the conveyor belt 101, so that the spring roll skin is guided by the covering cylinder 304 into the storage cylinder 305 for centralized storage, thereby ensuring that only spring roll skin that meets the flatness standard enters the next production link.

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

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

Claims

1. The online detection system for spring roll wrap thickness and uniformity based on machine vision is characterized by: include: An inclined plate (103), wherein the bottom and one end of the top of the inclined plate (103) are both fixedly connected to a straight plate (1), 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 sleeved between two groups of the transmission columns (111), the transmission column (111) is fixedly connected to the output shaft of a reduction motor (102), and the reduction motor (102) is fixedly installed at one end of the straight plate (1); A first mounting plate (107) is fixedly mounted on one end of the straight plate (1), a purge mechanism (3) is fixedly mounted on the upper surface of the first mounting plate (107), and a purge end of the purge mechanism (3) is suspended and covers the upper surface of the conveyor belt (101); Wherein, both sides of the straight plate (1) at the bottom are fixedly installed with splicing mechanisms (2), so that the two groups of splicing mechanisms (2) can be clamped toward the center synchronously, and the splicing mechanisms (2) can be clamped at one end of another group of conveying equipment, so that the splicing mechanisms can splice the straight plate (1) with the conveying equipment for conveying spring roll skins.

2. The machine vision-based online detection system for spring roll wrap thickness and uniformity according to claim 1, characterized in that: A limiting wheel (110) is rotatably installed between the connection points of the inclined plate (103) and the straight plates (1) at both ends, so that the limiting wheel (110) can limit the conveyor belt (101) and roll it into a Z shape formed by the inclined plate (103) and the straight plates (1).

3. The machine vision-based online detection system for spring roll wrap thickness and uniformity according to claim 2, characterized in that: A first C-shaped frame (104) is fixedly mounted on the upper surface between the two groups of inclined plates (103), and a camera (105) is fixedly mounted inside the first C-shaped frame (104), so that the camera (105) is flush with the inclination of the inclined plates (103), thereby enabling the conveyor belt (101) of the inclined segment to convey the spring roll skin so that the thickness surface of one side of the spring roll skin is flush with the camera (105).

4. The machine vision-based online detection system for spring roll wrap thickness and uniformity according to claim 2, characterized in that: A laser displacement sensor (106) is fixedly mounted on the upper surface between the two groups of straight plates (1), and a laser emitting end of the laser displacement sensor (106) is flush with the conveyor belt (101) in the straight plate (1), so that the conveyor belt (101) in the straight plate (1) can convey the spring roll skin directly below the laser displacement sensor (106), so that the laser displacement sensor (106) can calculate the distance from the spring roll skin by emitting a laser beam to the surface of the spring roll skin and measuring the reflected laser signal, and different sections of the spring roll skin can be measured by the continuous conveyance of the conveyor belt (101), so that the laser displacement sensor (106) can detect the height change of the surface of the spring roll skin, thereby evaluating the flatness.

5. The machine vision-based online detection system for spring roll wrap thickness and uniformity according to claim 3 or 4, characterized in that: 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 mounted on the upper surface of a second mounting plate (108); the second mounting plate (108) is fixedly mounted on one end of the straight plate (1); the computer (109) is integrated with a Canny algorithm, which can obtain thickness information of the spring roll skin when the camera (105) acquires images, uses the Canny algorithm to extract the edge of the spring roll skin, and uses the conversion relationship between pixels and actual sizes to calculate the thickness information of the spring roll skin.

6. The machine vision-based online detection system for spring roll wrap thickness and uniformity according to claim 1, characterized in that: The purge mechanism (3) comprises 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 is slidably attached to the upper surface of the conveyor belt (101); and the pneumatic pump (301) is also controlled by a computer (109).

7. The machine vision-based online detection system for spring roll wrap thickness and uniformity according to claim 6, characterized in that: 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 connected and 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 taking 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 taking port (307).

8. The machine vision-based online detection system for spring roll wrap thickness and uniformity according to claim 1, characterized in that: The splicing mechanism (2) comprises two groups of second C-shaped frames (202), the two groups of the second C-shaped frames (202) are fixedly mounted on both sides of the straight plate (1) at the bottom, the two groups of the second C-shaped frames (202) are both rotatably mounted with a hydraulic rod (201), one end of the piston rod of the hydraulic rod (201) is rotatably mounted with an H-shaped plate (203), the other group of the H-shaped plates (203) are rotatably mounted at one end inside the second C-shaped frames (202), one end of the H-shaped plates (203) is fixedly mounted with a connecting arm (204), and one end of the connecting arm (204) is fixedly mounted with a top pressure pad (205).

9. The machine vision-based online detection system for spring roll wrap thickness and uniformity according to claim 8, characterized in that: 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.

10. A machine vision-based online detection system and method for thickness and uniformity of spring roll wrappers, characterized in that: The online detection method for thickness and uniformity of spring roll wrapper based on machine vision according to any one of claims 1 to 9 specifically comprises the following steps: S1: When testing the thickness and uniformity of the spring roll skin, the conveying device for the spring roll skin is connected to the straight plate (1) at the bottom, and then two groups of hydraulic rods (201) are synchronously started to push the H-shaped plate (203), 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 the pressing pads (205) at one end of the two groups of H-shaped plates (203) can be synchronously driven to press on both sides of the spring roll skin conveying device, so that the spring roll skin conveying device can be spliced ​​to one end of the straight plate (1) at the bottom, and the spring roll skin conveying device can convey the spring roll skin to the conveyor belt (101) of the straight plate (1); S2: until the conveyor belt (101) conveys the spring roll skin to the conveyor belt (101) in the inclined plate (103) segment and is flush with the lens of the camera (105), the camera (105) can capture the thickness image of the side of the spring roll skin, and use the Canny algorithm to analyze the edge of the spring roll skin, then combine the pixel and the actual size conversion, obtain the actual spring roll skin thickness data and send it to the computer (109), so as to complete the thickness detection of the spring roll skin; S3: Subsequently, as the conveyor belt (101) conveys the spring roll skin to the upper surface of the conveyor belt (101) in the top straight plate (1) segment, the spring roll skin can move past the lower end of the laser displacement sensor (106), so that the laser displacement sensor (106) can calculate the distance from 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 conveyance of the conveyor belt (101) can measure different segments of the spring roll skin, so that the laser displacement sensor (106) can detect the height change of the surface of the spring roll skin and send the flatness information to the computer (109), so that the computer (109) can evaluate the flatness of the spring roll skin. S4: 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), 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.

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