Intelligent detection method and system for plastic package defects of prefabricated vegetables

Abstract

The invention discloses a prefabricated vegetable plastic package defect intelligent detection method and system. The system comprises a rack, a feeding device, a primary detection device used for carrying out crushing detection on packages and an air leakage detection device used for detecting whether the packages are damaged or not. The feeding device comprises a conveying mechanism used for conveying packaging bags, a support arranged on the rack in a lifting mode, a clamping mechanism used for clamping the packaging bags and a supporting mechanism used for supporting the packaging bags. The supporting mechanisms comprise supporting rollers arranged on the support, the number of the supporting mechanisms is two, the supporting mechanisms are located on the two sides of the supporting rollers respectively, the supporting rollers support the middle position of a packaging bag, the two ends of the packaging bag are lower than the middle position of the packaging bag, and the primary detection device detects whether the interior of the packaging bag leaks or not. The device has the effect of efficiently detecting whether the packaging bag is damaged or not, and the detection efficiency is high.

Description

Technical Field

[0001] The present application relates to the technical field of packaging defect detection, and in particular to an intelligent detection method and system for plastic-sealed packaging defects of prepared dishes. Background Art

[0002] At present, pre-prepared food refers to pre-processed and packaged food, which is convenient for consumers to quickly prepare and eat at home. The pre-prepared food industry has developed rapidly in recent years, but with the expansion of product production and sales, the quality inspection of plastic packaging has become an important field; traditional pre-prepared food packaging inspection mainly relies on manual visual inspection and manual operation. Manual inspectors need to visually inspect the sealing, integrity and appearance of the packaging on the production line. However, manual inspection is based on manpower, experience and subject matter, and it is easy to miss and misdetect during long working hours. In addition, manual inspection is difficult to maintain stable inspection quality in a high-speed and high-intensity production environment. Traditional inspection methods usually inspect after the product is sealed, and lack the ability to perform real-time inspection during the processing and sealing process. This means that the problem may not be discovered in the early stages of production until it is later detected in the quality control link, resulting in reduced production efficiency and increased scrap rate. At the same time, traditional technologies lack timely warning mechanisms and cannot respond quickly to key issues such as air leakage.

[0003] In the related art, a Chinese patent with a patent publication number of CN118362569A proposes an intelligent detection method and system for defects in plastic-sealed packaging of pre-prepared dishes, which relates to the technical field of defect detection of plastic-sealed packaging of pre-prepared dishes. The system collects environmental data and sealing machine parameter data in real time during the processing and sealing process through a food processing detection module and a first air leakage detection module to ensure that the production process meets the standards. Once a package leak is detected, a first early warning instruction is generated to prevent unqualified products from entering the next production link. A defect recognition model is constructed to calculate the external defect index Qxw and the internal defect index Qxn of the package to objectively evaluate the packaging quality. The third detection module can timely detect frosting and ice condensation problems that may be caused by package damage and poor sealing by constructing a frosting and ice condensation index JSz. Through multi-level detection and evaluation, the system promotes accurate and rapid identification of various defects in plastic-sealed packaging of pre-prepared dishes, greatly improves detection accuracy and efficiency, and reduces missed detection and false detection.

[0004] With respect to the above-mentioned related technologies, the inventors believe that the following defects exist: during the air leakage detection process, the packaging bag needs to be placed in water each time and then the bubbles need to be observed, which results in low efficiency. Summary of the invention

[0005] In order to improve the problem of low efficiency in detecting damaged packaging bags, the present application provides a method and system for intelligently detecting defects in plastic-sealed packaging of pre-prepared dishes.

[0006] The present application provides an intelligent detection system for defects in plastic packaging of prepared dishes, which adopts the following technical solutions: An intelligent detection system for defects in plastic-sealed packaging of prepared dishes, comprising a frame, a feeding device, a primary detection device for detecting whether the packaging is broken, and an air leakage detection device for detecting whether the packaging is damaged; The feeding device comprises a conveying mechanism for conveying packaging bags, a bracket lifted and arranged on the frame, a clamping mechanism for clamping packaging bags, and a supporting mechanism for supporting packaging bags; The support mechanism includes a support roller arranged on the bracket, and the support mechanism is provided with two and respectively located on both sides of the support roller, the support roller supports the middle position of the packaging bag and the positions of the two ends of the packaging bag are lower than the middle position, and the primary detection device detects whether there is leakage in the packaging bag.

[0007] Optionally, the clamping mechanism includes a clamping frame slidably disposed on the bracket, two clamping rollers slidably disposed on the clamping frame, and a power component for controlling the two clamping rollers to move closer to / away from each other, and the initial positions of the clamping roller located below and the supporting roller are located on the same horizontal plane.

[0008] Optionally, the power assembly includes a double-headed threaded rod, a power motor, two sliders and a slide rod. The double-headed threaded rod is rotatably arranged on the clamping frame. The power motor controls the rotation of the double-headed threaded rod. The two sliders are rotationally connected to the two clamping rollers respectively. The slider is also provided with a rotating motor for controlling the rotation of the clamping rollers. The slide rod is fixed on the clamping frame and arranged parallel to the double-headed threaded rod. The two sliders are sleeved and slid outside the slide rod.

[0009] Optionally, the primary detection device includes a water tank, a detection box, an adsorption mechanism for adsorbing oil stains, a control mechanism for controlling the water in the detection box, and an identification mechanism for identifying whether there is oil stains in the water; the water tank is arranged on the frame, and the detection box is arranged in the water tank and is located below the bracket.

[0010] Optionally, the identification mechanism includes two identification boxes, multiple oil detection paper strips, a traction assembly for pulling the oil detection paper strips, and a color sensor. The two identification boxes are respectively fixed on both sides of the detection box, the traction assembly is arranged in the identification boxes, and the corresponding side walls of the identification boxes are provided with perforations for the oil detection paper strips to pass through. The color sensor is arranged in any one of the identification boxes and faces the oil detection paper strips.

[0011] Optionally, the adsorption mechanism includes a plurality of oil-absorbing papers, which are spaced apart from the oil detection paper strip. The traction assembly includes two traction rollers, two traction motors and a plurality of traction ropes. The traction rollers are rotatably arranged in the identification box, the traction motors are fixed in the identification box, and the oil-absorbing papers are connected to the oil detection paper strip via the traction rope.

[0012] Optionally, the control mechanism includes a control panel rotatably arranged at the bottom of the detection box, a control motor for driving the control panel to rotate, a water suction pump for extracting oil and water, and a water suction pipe connected to the output end of the water suction pump, the water suction pump is arranged at a position of the detection box close to the control panel, and the color sensor is electrically connected to the water suction pump.

[0013] Optionally, the air leakage detection device includes a transparent plate, a light source and a camera. The water tank is provided with two transparent openings, and the two transparent plates are respectively arranged at the two transparent openings. The light source is installed on the back of any one of the transparent plates, and the camera is installed on the back of the other transparent plate.

[0014] Optionally, the support mechanism also includes a support plate slidably disposed on the bracket, a flapping motor for controlling the rotation of the support roller, a flapping plate slidably disposed in the support roller, and a driving assembly for controlling the movement of the flapping plate, wherein a driving groove is disposed in the support roller, and the flapping plate slides in the driving groove.

[0015] In summary, the present application includes at least one of the following beneficial technical effects: 1. When the power motor controls the double-headed threaded rod to rotate, under the restriction of the slide bar, the slider can only move along the length direction of the slide bar, and the two sliders begin to move toward or away from each other, thereby realizing the driving effect of the two clamping rollers. In the initial state, the distance between the two clamping rollers is greater than the thickness of the packaging bag, and the position of the clamping frame needs to be adjusted to ensure that the clamping roller located below is located in the same horizontal plane as the belt and the support roller. When the packaging bag is conveyed to the clamping roller, it is necessary to control the clamping roller to start rotating. Under the cooperation of the clamping roller and the support roller, the packaging bag is conveyed toward the other clamping frame to ensure that the two ends of the packaging bag are respectively located on two different clamping frames, and the middle position of the packaging bag is located on the support roller. Then, the two clamping rollers are controlled to move closer to each other and clamp the corresponding ends of the packaging bag, and then the corresponding clamping frame moves downward, and the end of the packaging bag moves to a position lower than the support roller. As the vegetables in the packaging bag flow freely, the vegetables are divided into two parts and flow to both ends of the packaging bag. If the packaging bag is relatively damaged, vegetable oil will flow out; 2. If the vegetable oil in the packaging bag drips into the detection box, the oil detection paper strip is pulled into the detection box by two traction rollers. At this time, the oil detection paper strip changes color. At this time, the oil detection paper strip is pulled into the identification box and is located at the color sensor. If the color sensor triggers the buzzer to make a sound, it proves that there is oil in the detection box and the packaging bag is damaged. At this time, the oil-absorbing paper is in the detection box. The oil-absorbing paper absorbs the vegetable oil, thereby reducing the impact of the oil on the detection box or the oil in the water tank. Only when the oil detection paper detects that there is no oil in the detection box, the control motor will start the control board; 3. In the initial state, the clamping frame is controlled to move until the packaging bag is in a horizontal state, and the upper side of the packaging bag is in contact with the support plate. After the bracket is moved into the water tank, the support roller is controlled to rotate, and the support roller rotates toward one end of the packaging bag. At the same time, the flapping plate also moves toward this end of the packaging bag. During the movement of the flapping plate and the rotation of the support roller, the flapping plate squeezes the packaging bag. If the packaging bag is slightly damaged, bubbles will be generated in the water, which can be successfully captured by the camera; when no bubbles are generated at one end of the packaging bag, in order to detect more accurately, the support roller moves toward the other end of the packaging bag, and the flapping plate and the support tube cooperate with each other to squeeze the other end of the packaging bag to observe whether there are bubbles in the water tank. If there are no bubbles, the packaging bag is not damaged. Of course, some oil may overflow during the bubble detection process, but in this embodiment, it is assumed that a small amount of oil will not pollute the water in the water tank, or if there is more oil after multiple tests, the water in the water tank needs to be replaced. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the overall structure of the first embodiment of the present application; Figure 2 It is a schematic diagram of the oil detection paper strip, oil absorbing paper and traction rope in the first embodiment of the present application; Figure 3 is a schematic diagram of a power assembly in Embodiment 1 of the present application; Figure 4 yes Figure 1 Enlarged view of point A in the middle.

[0017] 1. Frame; 2. Conveying mechanism; 3. Bracket; 4. Support roller; 5. Clamping frame; 6. Clamping roller; 7. Double-headed threaded rod; 8. Power motor; 9. Sliding block; 10. Sliding bar; 11. Rotating motor; 12. Water tank; 13. Detection box; 14. Identification box; 15. Oil detection paper strip; 16. Traction roller; 17. Traction rope; 18. Perforation; 19. Color sensor; 20. Oil-absorbing paper; 21. Control board; 22. Control motor; 23. Water suction pump; 24. Water suction pipe; 25. Transparent plate; 26. Light source; 27. Camera; 28. Support plate; 29. ​​Beating motor; 30. Beating plate; 31. Driving motor; 32. Gear; 33. Rack; 34. Avoidance hole. DETAILED DESCRIPTION

[0018] The following is combined with Figure 1-4 This application is described in further detail.

[0019] Embodiment 1

[0020] The present application embodiment discloses an intelligent detection system for defects in plastic packaging of pre-prepared dishes. Figure 1-Figure 4 , a system for intelligently detecting defects in plastic-sealed packaging of pre-prepared dishes comprises a machine frame 1, a feeding device, a primary detection device for detecting breakage of packaging, and a gas leakage detection device for detecting whether the packaging is damaged; firstly, the packaging bag is transported to the position of the primary detection device through the feeding device. If the packaging is damaged, vegetable oil stains will appear during the process of the primary detection device. Therefore, it is only necessary to detect the vegetable oil stains to determine whether the packaging is damaged. If the hole in the packaging is small, it is necessary to pass the gas leakage detection device for detection to determine whether the packaging is damaged.

[0021] The feeding device includes a conveying mechanism 2 for conveying packaging bags, a bracket 3 lifted and lowered on the frame 1, a clamping mechanism for clamping the packaging bags, and a supporting mechanism for supporting the packaging bags; the conveying mechanism 2 in this embodiment uses a belt drive, and it is only necessary to place the packaging bag on the belt, and then the belt transports the packaging bag toward the clamping mechanism. After the clamping mechanism clamps the packaging bag, it is first inspected in the primary detection device. If a leakage detection device is required for detection, it is necessary to control the bracket 3 to move to the leakage detection device for detection.

[0022] The supporting mechanism includes a supporting roller 4 arranged on the bracket 3. The supporting mechanism is provided with two and respectively located on both sides of the supporting roller 4. The supporting roller 4 supports the middle position of the packaging bag and the positions of the two ends of the packaging bag are lower than the middle position. The primary detection device detects whether there is leakage in the packaging bag. The supporting roller 4 can rotate or not in this embodiment, and it does not need to rotate in the primary detection device. The clamping mechanism includes a clamping frame 5 slidably arranged on the bracket 3, two clamping rollers 6 slidably arranged on the clamping frame 5, and a power component for controlling the two clamping rollers 6 to approach / move away from each other. The clamping roller 6 located at the bottom is located on the same horizontal plane as the initial position of the supporting roller 4; the two clamping frames 5 are respectively located on both sides of the supporting roller 4, and in this embodiment, the clamping frame 5 can be symmetrically arranged relative to the vertical symmetry plane of the supporting roller 4, and each clamping frame 5 is provided with two clamping rollers 6, and the movement of the two clamping rollers 6 and the clamping frame 5 is all along the vertical direction. The lifting and lowering of the clamping frame 5 is realized by a cylinder or an electric push rod.

[0023] Reference Figure 1-Figure 4, the power assembly includes a double-headed threaded rod 7, a power motor 8, two sliders 9 and a slide bar 10. The double-headed threaded rod 7 is rotatably arranged on the clamping frame 5. The power motor 8 controls the rotation of the double-headed threaded rod 7. The two sliders 9 are respectively connected to the two clamping rollers 6 for rotation. The slider 9 is also provided with a rotating motor 11 for controlling the rotation of the clamping roller 6. The slide bar 10 is fixed on the clamping frame 5 and arranged in parallel with the double-headed threaded rod 7. The two sliders 9 are sleeved and slid outside the slide bar 10. A protective box needs to be provided outside the power motor 8 to prevent the power motor 8 from entering the water and being damaged. The double-headed threaded rod 7 is spirally matched with the two sliders 9, and the two sliders 9 are respectively located at the two ends of the double-headed threaded rod 7 in opposite spiral directions. Therefore, when the power motor 8 controls the double-headed threaded rod 7 to rotate, under the restriction of the slide bar 10, the slider 9 can only move along the length direction of the slide bar 10, and the two sliders 9 begin to move toward or away from each other, thereby realizing the driving effect of the two clamping rollers 6. When the packaging bag is transported to the clamping roller 6, it is necessary to control the clamping roller 6 to start rotating, and with the cooperation of the clamping roller 6 and the supporting roller 4, the packaging bag is transported toward the other clamping frame 5. In this embodiment, an infrared sensor is provided on the clamping frame 5 located far away, so as to ensure that the two ends of the packaging bag are respectively located on two different clamping frames 5, and the middle position of the packaging bag is located on the supporting roller 4. Then, the two clamping rollers 6 are controlled to move close to each other and clamp the corresponding ends of the packaging bag, and then the corresponding clamping frame 5 is moved downward, and the end of the packaging bag moves to a position lower than the supporting roller 4. As the vegetables in the packaging bag flow freely, the vegetables are divided into two parts and both flow to the two ends of the packaging bag. If the packaging bag is relatively damaged, vegetable oil will flow out.

[0024] The primary detection device includes a water tank 12, a detection box 13, an adsorption mechanism for adsorbing oil stains, a control mechanism for controlling the water in the detection box 13, and an identification mechanism for identifying whether there is oil stain in the water; the water tank 12 is arranged on the frame 1, the detection box 13 is arranged in the water tank 12 and is located below the bracket 3, the water tank 12 is fixed on the frame 1, and the detection box 13 is fixed inside the water tank 12. The adsorption mechanism can only discharge the oil stains after adsorbing them, and the identification mechanism is used to prove whether there is oil stain; the identification mechanism includes two identification boxes 14, a plurality of oil detection paper strips 15, a traction component for traction of the oil detection paper strips 15, and a color sensor 19, the two identification boxes 14 They are respectively fixed on both sides of the detection box 13, the traction component is arranged in the identification box 14, and the corresponding side wall of the identification box 14 is provided with a perforation 18 for the oil detection paper strip 15 to pass through. The color sensor 19 is arranged in any identification box 14 and is directly opposite to the oil detection paper strip 15. When the test paper contacts the oil in the water, the oil molecules react with the chemical reagents on the test paper, causing the color of the test paper to deepen, and the oil detection paper strip 15 will change to a specific color after contact with the oil, such as red, blue or green. In this embodiment, it is only necessary to ensure that the oil detection paper strip 15 can change color, and the color sensor 19 can identify the final color after the change. The color sensor 19 is controlled by a PLC controller and is connected to a buzzer.

[0025] Reference Figure 1-Figure 4 The adsorption mechanism includes a plurality of oil-absorbing papers 20, and the oil-absorbing papers 20 are arranged at intervals with the oil detection paper strip 15. The traction assembly includes two traction rollers 16, two traction motors and a plurality of traction ropes 17. The traction rollers 16 are rotatably arranged in the identification box 14, and the traction motor is fixed in the identification box 14. The oil-absorbing papers 20 are connected to the oil detection paper strip 15 and then connected through the traction rope 17, that is, the oil-absorbing papers 20, the oil detection paper strip 15 and the traction rope 17 are arranged at intervals and are divided into a group. The traction ropes 17 at both ends are respectively fixedly connected to the outer peripheral walls of the two traction rollers 16. The traction ropes 17 are provided with avoidance holes 34 for passing through when the bracket 3 is lowered. In the initial state, the traction ropes 17 are located directly below the bracket 3, and in this embodiment, the traction ropes 1 7. The oil absorbing paper 20 and the oil detection paper strip 15 are located below the liquid level of the detection box 13. Therefore, when the two ends of the packaging bag are lower than the support roller 4, if the vegetable oil in the packaging bag drips into the detection box 13, the two traction rollers 16 cooperate to pull the oil detection paper strip 15 into the detection box 13. At this time, the oil detection paper strip 15 changes color. At this time, the oil detection paper strip 15 is pulled into the identification box 14 and is located at the color sensor 19. If the color sensor 19 triggers the buzzer to make a sound, it proves that there is oil in the detection box 13 and the packaging bag is damaged. At this time, the oil absorbing paper 20 is located in the detection box 13, and the oil absorbing paper 20 absorbs the vegetable oil, thereby reducing the impact of the oil on the detection box 13 or the oil in the water tank 12.

[0026] The control mechanism includes a control panel 21 rotatably arranged at the bottom of the detection box 13, a control motor 22 for driving the control panel 21 to rotate, a water suction pump 23 for extracting oil and water, and a water suction pipe 24 connected to the output end of the water suction pump 23. The water suction pump 23 is arranged at a position of the detection box 13 close to the control panel 21. The color sensor 19 is electrically connected to the water suction pump 23. The color sensor 19 is connected to the water suction pump 23 through a PLC controller. The bottom end of the detection box 13 is opened and connected to the water tank 12. The detection box 13 is located in the water tank 12. The axis of rotation of the control panel 21 and the detection box 13 is located on the symmetric plane of the control panel 21. A protective box is also provided outside the control motor 22 to prevent the control motor 22 from entering the water and being damaged. Only when the oil detection paper strip 15 detects that there is no oil in the detection box 13, the control motor 22 will turn on the control panel 21. In this embodiment, in order to ensure that the bracket 3 can smoothly pass through the detection box 13 and the control panel 21, the bracket 3 and the control panel 21 are staggered in the vertical direction. When the oil absorbing paper 20 completes the absorption work, the water in the detection box 13 is drained by the water suction pump 23 before the control panel 21 can be opened.

[0027] The air leakage detection device includes a transparent plate 25, a light source 26 and a camera 27. The water tank 12 is provided with two transparent openings, and the two transparent plates 25 are respectively arranged at the two transparent openings. The light source 26 is installed on the back of any transparent plate 25, and the camera 27 is installed on the back of the other transparent plate 25. The transparent plate 25 is located close to the two ends of the packaging bag, and the camera 27 is directly opposite to the end of the packaging bag. Of course, two light sources 26 and two cameras 27 can also be set, and the same camera 27 and light source 26 can also be set along the length direction of the packaging bag; the supporting mechanism also includes a supporting plate 28 arranged on the bracket 3, a flapping motor 29 for controlling the rotation of the supporting roller 4, a flapping plate 30 slidingly arranged in the supporting roller 4, and a control The driving assembly for controlling the movement of the flapping plate 30 has a driving groove provided in the supporting roller 4, and the flapping plate 30 slides in the driving groove. The supporting plate 28 can slide on the bracket 3 and can also be fixed on the bracket 3. The driving assembly includes a driving motor 31, a gear 32 and a rack 33. The driving motor 31 is installed in the driving groove, and a protective box is also required to be provided outside the driving motor 31 for protection. The gear 32 is rotatably arranged in the driving groove, and the rack 33 is slidably arranged in the driving groove. The rack 33 is meshed and connected with the gear 32, and the rack 33 is fixedly connected to the flapping plate 30. The driving motor 31 adopts a servo motor and can rotate forward or reverse. The driving motor 31 controls the gear 32 to rotate forward or reverse, so the flapping plate 30 moves toward both sides of the packaging bag respectively.

[0028] In the initial state, the clamping frame 5 is controlled to move until the packaging bag is in a horizontal state, and the upper side of the packaging bag is in contact with the support plate 28. After the bracket 3 is moved into the water tank 12, the support roller 4 is controlled to rotate, and the support roller 4 rotates toward one end of the packaging bag. At the same time, the flapping plate 30 also moves toward this end of the packaging bag. During the movement of the flapping plate 30 and the rotation of the support roller 4, the flapping plate 30 squeezes the packaging bag. If the packaging bag is slightly damaged, bubbles are generated in the water, which can be successfully captured by the camera 27; when no bubbles are generated at one end of the packaging bag, in order to detect more accurately, the support roller 4 moves toward the other end of the packaging bag, and the flapping plate 30 and the support tube cooperate with each other to squeeze the other end of the packaging bag to observe whether there are bubbles in the water tank 12. If there are no bubbles, the packaging bag is not damaged. Of course, during the bubble detection process, some oil may overflow, but in this embodiment, it is assumed that a small amount of oil will not pollute the water in the water tank 12, or if there is more oil after multiple detections, the water in the water tank 12 needs to be replaced.

[0029] The implementation principle of the intelligent detection system for plastic packaging defects of pre-prepared dishes in the embodiment of the present application is as follows: when the power motor 8 controls the double-headed threaded rod 7 to rotate, under the restriction of the slide bar 10, the slide block 9 can only move along the length direction of the slide bar 10, and the two slide blocks 9 begin to move toward or away from each other, thereby achieving the driving effect on the two clamping rollers 6. In the initial state, the distance between the two clamping rollers 6 is greater than the thickness of the packaging bag, and the position of the clamping frame 5 needs to be adjusted to ensure that the clamping roller 6 located below is in the same horizontal plane as the belt and the support roller 4. When the packaging bag is conveyed to the clamping roller 6, at this time It is necessary to control the clamping roller 6 to start rotating, and with the cooperation of the clamping roller 6 and the supporting roller 4, the packaging bag is transported toward the other clamping frame 5 to ensure that the two ends of the packaging bag are respectively located on two different clamping frames 5, and the middle position of the packaging bag is located on the supporting roller 4. Then, the two clamping rollers 6 are controlled to move close to each other and clamp the corresponding ends of the packaging bag, and then the corresponding clamping frame 5 moves downward, and the end of the packaging bag moves to a position lower than the supporting roller 4. As the vegetables in the packaging bag flow freely, the vegetables are divided into two parts and both flow to the two ends of the packaging bag. If the packaging bag is relatively damaged, vegetable oil will flow out.

[0030] If the vegetable oil in the packaging bag drips into the detection box 13, the two traction rollers 16 cooperate to pull the oil detection paper strip 15 into the detection box 13. At this time, the oil detection paper strip 15 changes color. At this time, the oil detection paper strip 15 is pulled into the identification box 14 and is located at the color sensor 19. If the color sensor 19 triggers the buzzer to make a sound, it proves that there is oil in the detection box 13 and the packaging bag is damaged. At this time, the oil-absorbing paper 20 is located in the detection box 13, and the oil-absorbing paper 20 absorbs the vegetable oil, thereby reducing the impact of the oil on the detection box 13 or the oil in the water tank 12. Only when the oil detection paper strip 15 detects that there is no oil in the detection box 13, the control motor 22 will turn on the control board 21.

[0031] In the initial state, the clamping frame 5 is controlled to move until the packaging bag is in a horizontal state, and the upper side of the packaging bag is in contact with the support plate 28. After the bracket 3 is moved into the water tank 12, the support roller 4 is controlled to rotate, and the support roller 4 rotates toward one end of the packaging bag. At the same time, the flapping plate 30 also moves toward this end of the packaging bag. During the movement of the flapping plate 30 and the rotation of the support roller 4, the flapping plate 30 squeezes the packaging bag. If the packaging bag is slightly damaged, bubbles are generated in the water, which can be successfully captured by the camera 27; when no bubbles are generated at one end of the packaging bag, in order to detect more accurately, the support roller 4 moves toward the other end of the packaging bag, and the flapping plate 30 and the support tube cooperate with each other to squeeze the other end of the packaging bag to observe whether there are bubbles in the water tank 12. If there are no bubbles, the packaging bag is not damaged. Of course, during the bubble detection process, some oil may overflow, but in this embodiment, it is assumed that a small amount of oil will not pollute the water in the water tank 12, or if there is more oil after multiple detections, the water in the water tank 12 needs to be replaced.

[0032] Embodiment 2

[0033] The present application embodiment discloses an intelligent detection method for defects in plastic packaging of pre-prepared dishes. Figure 1 , a method for intelligently detecting defects in plastic packaging of pre-prepared dishes comprises the following steps: S1. Loading, placing the packaging bag on the conveying mechanism 2 and conveying it to the supporting roller 4 and two sets of clamping rollers 6, and ensuring that the middle of the packaging bag is located on the supporting roller 4; in the initial state, it is necessary to adjust the position of the clamping frame 5 to ensure that the clamping roller 6 located below is located in the same horizontal plane as the belt and the supporting roller 4. When the packaging bag is conveyed to the clamping roller 6, it is necessary to control the clamping roller 6 to start rotating. With the cooperation of the clamping roller 6 and the supporting roller 4, the packaging bag is conveyed toward the other clamping frame 5 to ensure that the two ends of the packaging bag are respectively located on two different clamping frames 5, and the middle of the packaging bag is located on the supporting roller 4.

[0034] S2, initial detection, control the two groups of clamping rollers 6 to move downward and below the position of the support roller 4, and detect through the oil detection paper strip 15. If there is oil stain, the oil absorbing paper 20 is needed to absorb it, and the oil and water are extracted after the absorption is completed; at this time, it is judged that the packaging bag is damaged; if the vegetable oil stain in the packaging bag drips into the detection box 13, at this time, the oil detection paper strip 15 is pulled into the detection box 13 through the cooperation of two traction rollers 16, and the oil detection paper strip 15 changes color. At this time, the oil detection paper strip 15 is pulled into the identification box 14 and is located at the color sensor 19. If the color sensor 19 triggers the buzzer to make a sound, it proves that there is oil stain in the detection box 13 and the packaging bag is damaged. At this time, the oil absorbing paper 20 is located in the detection box 13, and the oil absorbing paper 20 absorbs the vegetable oil stain, thereby reducing the impact of the oil stain on the detection box 13 or the oil stain in the water tank 12.

[0035] S3, bubble detection, if there is no oil stain in S2, then enter the water tank 12 for detection, rotate the support roller 4 and gradually slide the flapping board 30 out, and observe whether there are bubbles through the camera 27. If there are bubbles, it proves that the packaging bag is damaged. After moving the bracket 3 into the water tank 12, start to control the rotation of the support roller 4, and the support roller 4 rotates toward one end of the packaging bag. At the same time, the flapping board 30 also moves toward this end of the packaging bag. During the movement of the flapping board 30 and the rotation of the support roller 4, the flapping board 30 squeezes the packaging bag. If the packaging bag is slightly damaged, bubbles will be generated in the water, which can be successfully captured by the camera 27.

[0036] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. An intelligent detection system for defects in plastic packaging of prepared dishes, characterized by: It comprises a frame (1), a feeding device, a primary detection device for detecting whether the package is broken, and a gas leakage detection device for detecting whether the package is damaged; The loading device comprises a conveying mechanism (2) for conveying packaging bags, a bracket (3) arranged on the frame (1) in a lifting manner, a clamping mechanism for clamping the packaging bags, and a supporting mechanism for supporting the packaging bags; The support mechanism comprises a support roller (4) arranged on the bracket (3), the support mechanism is provided in two pieces and is respectively located on both sides of the support roller (4), the support roller (4) supports the middle position of the packaging bag and the positions of the two ends of the packaging bag are lower than the middle position, and the primary detection device detects whether there is leakage in the packaging bag.

2. The intelligent detection system for pre-prepared food plastic packaging defects according to claim 1 is characterized by: The clamping mechanism comprises a clamping frame (5) slidably arranged on the bracket (3), two clamping rollers (6) slidably arranged on the clamping frame (5), and a power component for controlling the two clamping rollers (6) to move closer to / away from each other, wherein the initial positions of the clamping roller (6) located at the bottom and the supporting roller (4) are located on the same horizontal plane.

3. The intelligent detection system for pre-prepared food plastic packaging defects according to claim 2 is characterized by: The power assembly comprises a double-headed threaded rod (7), a power motor (8), two sliders (9) and a slide bar (10); the double-headed threaded rod (7) is rotatably arranged on the clamping frame (5); the power motor (8) controls the rotation of the double-headed threaded rod (7); the two sliders (9) are rotatably connected to the two clamping rollers (6) respectively; the slider (9) is also provided with a rotating motor (11) for controlling the rotation of the clamping rollers (6); the slide bar (10) is fixed on the clamping frame (5) and arranged parallel to the double-headed threaded rod (7); the two sliders (9) are sleeved and slidably arranged outside the slide bar (10).

4. The intelligent detection system for pre-prepared food plastic packaging defects according to claim 2, characterized in that: The primary detection device comprises a water tank (12), a detection box (13), an adsorption mechanism for adsorbing oil stains, a control mechanism for controlling the water in the detection box (13), and an identification mechanism for identifying whether oil stains exist in the water; the water tank (12) is arranged on the frame (1), and the detection box (13) is arranged in the water tank (12) and is located below the bracket (3).

5. The intelligent detection system for pre-prepared food plastic packaging defects according to claim 4 is characterized by: The marking mechanism comprises two marking boxes (14), a plurality of oil detection paper strips (15), a traction assembly for traction of the oil detection paper strips (15), and a color sensor (19); the two marking boxes (14) are respectively fixed on both sides of the detection box (13); the traction assembly is arranged in the marking boxes (14); corresponding side walls of the marking boxes (14) are provided with perforations (18) for the oil detection paper strips (15) to pass through; and the color sensor (19) is arranged in any one of the marking boxes (14) and faces the oil detection paper strips (15).

6. The intelligent detection system for pre-prepared food plastic packaging defects according to claim 5, characterized in that: The adsorption mechanism comprises a plurality of oil-absorbing papers (20), the oil-absorbing papers (20) and the oil detection paper strip (15) are arranged at intervals, the traction assembly comprises two traction rollers (16), two traction motors and a plurality of traction ropes (17), the traction rollers (16) are rotatably arranged in the identification box (14), the traction motor is fixed in the identification box (14), and the oil-absorbing papers (20) are connected to the oil detection paper strip (15) and then connected through the traction rope (17).

7. The intelligent detection system for pre-prepared food plastic packaging defects according to claim 6, characterized in that: The control mechanism comprises a control panel (21) rotatably arranged at the bottom of the detection box (13), a control motor (22) for driving the control panel (21) to rotate, a water suction pump (23) for extracting oil and water, and a water suction pipe (24) connected to the output end of the water suction pump (23); the water suction pump (23) is arranged at a position of the detection box (13) close to the control panel (21); and the color sensor (19) is electrically connected to the water suction pump (23).

8. The intelligent detection system for pre-prepared food plastic packaging defects according to claim 7, characterized in that: The air leakage detection device comprises a transparent plate (25), a light source (26) and a camera (27); the water tank (12) is provided with two transparent openings, the two transparent plates (25) are respectively arranged at the two transparent openings, the light source (26) is installed on the back side of any one of the transparent plates (25), and the camera (27) is installed on the back side of the other transparent plate (25).

9. The intelligent detection system for pre-prepared food plastic packaging defects according to claim 8, characterized in that: The support mechanism further comprises a support plate (28) slidably arranged on the bracket (3), a beating motor (29) for controlling the rotation of the support roller (4), a beating plate (30) slidably arranged in the support roller (4), and a driving component for controlling the movement of the beating plate (30), wherein a driving groove is arranged in the support roller (4), and the beating plate (30) slides in the driving groove.

10. A method and system for intelligently detecting defects in plastic packaging of prepared dishes, based on the intelligent system for intelligently detecting defects in plastic packaging of prepared dishes according to any one of claims 1 to 9, characterized in that: The steps include: S1, loading, placing the packaging bag on the conveying mechanism (2) and conveying it to the support roller (4) and two sets of clamping rollers (6), and ensuring that the middle of the packaging bag is located on the support roller (4); S2, initial detection, control the two groups of clamping rollers (6) to move downward and below the position of the support roller (4), and use the oil detection paper strip (15) to detect. If there is oil stain, oil absorbing paper (20) is required to absorb it. After the absorption is completed, the oil and water are extracted; at this time, it is judged that the packaging bag is damaged; S3, bubble detection, if there is no oil stain in S2, then enter the water tank (12) for detection, rotate the support roller (4) and gradually slide the beating plate (30) out, and observe whether there are bubbles through the camera (27). If there are bubbles, it proves that the packaging bag is damaged.

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