Ultraviolet online monitoring system for mildewing of tobacco lamina

Abstract

The utility model belongs to the technical field of cigarette production, and particularly relates to a tobacco strip mildew ultraviolet online monitoring system which comprises an image acquisition module, an edge calculation module and a tobacco strip conveying device, the image acquisition module is mounted above the tobacco lamina conveying device through a bracket and comprises a camera, an ultraviolet light source and a photoelectric switch; the shooting area of the camera coincides with the illumination area of the ultraviolet light source, the optoelectronic switch is installed on one side of the tobacco lamina conveying device, and the camera, the ultraviolet light source and the optoelectronic switch are connected with the edge calculation module. The ultraviolet light source is arranged to irradiate a shooting area; the camera shoots a flue-cured tobacco strip image under ultraviolet irradiation, and then the flue-cured tobacco strip image is sent to the edge calculation module for analysis; compared with an image shot under a common light source, the color features are more prominent, and the mildew detection accuracy can be improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of cigarette production, and particularly relates to an ultraviolet on-line monitoring system for the mildew of cut tobacco. Background Technique

[0002] The statements in this part only provide background technical information related to the utility model, and do not necessarily constitute prior art.

[0003] The aging of tobacco leaves is an important link in the cigarette production process. The aging of tobacco leaves refers to packing the tobacco leaves and storing them in a fermentation room with temperature and humidity control to accelerate the aging process of the tobacco leaves. The long-term storage during the aging process of tobacco leaves easily leads to the phenomenon of mildew. After the above problems occur, if the inspection is not timely, the whole box of cut tobacco will be scrapped; if the inspection is not in place, the problematic cut tobacco will flow into the production process, resulting in unqualified products.

[0004] In order to detect the situation of the tobacco leaves inside the box as much as possible, the detection station is generally installed in the process after slicing, but the best effect still cannot be achieved, and mildew cannot be detected in time. At this time, the boxed tobacco leaves have been sliced or post-processed.

[0005] Before the tobacco bale is rehumidified, the tobacco bale needs to be unpacked and sliced. The accuracy of the tobacco bale slicing will affect whether the cut tobacco can enter the loose rehumidification more evenly and make it have better processing uniformity. The tobacco industry uses a slicing machine for slicing, generally "three knives and four slices", but the accuracy of the tobacco bale slicing has always been a difficult problem in the cigarette factory wire-making process. At present, the industry basically adopts the method of photoelectric positioning bar code ranging to position and slice the tobacco bale. There is a bar code scanner at the upper end of the push plate, and the bar code scanner will scan the bar code in real time to read the length of the tobacco bale. Since the bar code scanner is bound to the push plate, it will occur during long-term use

[0006] At present, in order to timely discover the problem of mildew in cut tobacco, during the storage, storage out and production of cut tobacco, tobacco inspection personnel need to be arranged to conduct the unpacking inspection of cut tobacco; when mildew occurs in cut tobacco, it should be processed and recorded in time to avoid affecting the overall quality of cut tobacco. However, due to the huge workload of cut tobacco inspection, long inspection time, difficult personnel allocation and other reasons, the phenomenon of insufficient inspection of cut tobacco mildew still occurs from time to time.

[0007] The patent with the publication number of CN209447225U discloses a system for detecting the mildew of tobacco bales based on images, including a camera for taking pictures of the surface of the tobacco bale; a processor connected to the camera, for obtaining the photo of the surface of the tobacco bale and determining whether the tobacco bale is a mildewed tobacco bale according to the color characteristics in the photo.

[0008] Although this solution realizes the automatic detection of cigarette package mildew, on the one hand, it takes pictures of the surface of the cigarette package through multiple cameras and cannot detect the mildew inside the cigarette package; on the other hand, it takes pictures of images under ordinary light sources, and weak or uneven ambient light will affect the detection accuracy. Utility Model Content

[0009] To overcome the deficiencies of the above-mentioned prior art, the present utility model provides an ultraviolet online monitoring system for cut tobacco mildew.

[0010] To achieve the above object, one or more embodiments of the present utility model provide the following technical solutions:

[0011] The first aspect of the present utility model provides an ultraviolet online monitoring system for cut tobacco mildew, including an image acquisition module, an edge computing module, and a cut tobacco conveying device;

[0012] The image acquisition module is installed above the cut tobacco conveying device through a bracket, and the image acquisition module includes a camera, an ultraviolet light source, and a photoelectric switch;

[0013] The shooting area of the camera coincides with the illumination area of the ultraviolet light source. The photoelectric switch is installed on one side of the cut tobacco conveying device, and the camera, the ultraviolet light source, and the photoelectric switch are respectively connected to the edge computing module.

[0014] Further, the edge computing module includes a single-chip microcomputer, an image processing chip, and a communication module. The single-chip microcomputer is respectively connected to the image processing chip and the communication module;

[0015] The image processing chip is used to extract the color features of the collected pictures. The single-chip microcomputer transmits the collected pictures and the processing results of the image processing chip to the host computer through the communication module.

[0016] Further, the communication module is a ZigBee wireless communication module, and the ZigBee wireless communication module is connected to the single-chip microcomputer through an SPI interface.

[0017] Further, the image processing chip is an FPGA chip.

[0018] Further, the cut tobacco conveying device is a belt conveyor.

[0019] Further, the cut tobacco conveying device is arranged at the output end of the cigarette package slicing device and is used to convey cut tobacco leaves.

[0020] Further, the camera is an MV-CS200-10GM high-speed camera.

[0021] Further, the ultraviolet light source is an ultraviolet lamp tube.

[0022] Further, the field of view of the camera is perpendicular to the advancing direction of the sliced tobacco conveying device.

[0023] Further, the bracket is a height-adjustable bracket.

[0024] The above one or more technical solutions have the following beneficial effects:

[0025] (1) In the present utility model, it is considered that normal sliced tobacco will show a weak fluorescence reaction under the irradiation of an ultraviolet light source, while mildew will show a special fluorescence reaction under the irradiation of an ultraviolet light source. Therefore, the sliced tobacco is irradiated with an ultraviolet light source; the camera captures the image of the sliced tobacco under ultraviolet irradiation and then sends it to the edge computing device for analysis; compared with the image captured under ordinary light sources, the color features are more prominent, which can improve the accuracy of mildew detection.

[0026] (2) The monitoring system provided by the present utility model is arranged in the subsequent process of the cigarette packet slicing device. After the cigarette packet passes through the cigarette packet slicing device, it is cut into multiple slices, and the mildew situation inside the cigarette packet can be detected as much as possible. Compared with only capturing the overall appearance image of the cigarette packet for detection, the comprehensiveness of mildew detection can be improved.

[0027] (3) The monitoring system provided by the present utility model collects and transmits data based on a single-chip microcomputer, and processes the image based on an image processing chip, enabling the system to have edge computing capabilities and realizing automatic monitoring and early warning of mildew in on-line conveyed sliced tobacco.

[0028] The advantages of the additional aspects of the present utility model will be partially given in the following description, partially become obvious from the following description, or be understood through the practice of the present utility model. Description of the Drawings

[0029] The specification drawings constituting a part of the present utility model are used to provide a further understanding of the present utility model. The schematic embodiments of the present utility model and their descriptions are used to explain the present utility model and do not constitute an improper limitation to the present utility model.

[0030] Figure 1 It is a schematic structural diagram of an on-line ultraviolet monitoring system for mildew in sliced tobacco in Embodiment 1.

[0031] Figure 2 It is a schematic diagram of the principle of an on-line ultraviolet monitoring system for mildew in sliced tobacco in Embodiment 1.

[0032] In the figure, 1. Image acquisition module, 101 camera, 102 ultraviolet light source, 103 photoelectric switch, 2. Edge computing module, 3. Liquid crystal display screen, 4. Bracket, 5. Sliced tobacco conveying device. Detailed Embodiments

[0033] The present utility model will be further described below in conjunction with the accompanying drawings and embodiments.

[0034] Embodiment 1

[0035] As Figure 1 shown, the present utility model provides an online ultraviolet monitoring system for cut tobacco mildew, which includes an image acquisition module 1, an edge computing module 2, and a cut tobacco conveying device 5;

[0036] The image acquisition module 1 is installed above the cut tobacco conveying device 5 through a bracket 4. The cut tobacco conveying device 5 is arranged at the output end of a cigarette packet slicing device. The cigarette packet slicing device is used for slicing cigarette packets. During the cigarette production process, the equipment generally uses a "three-knife and four-piece" cutting method to cut the cigarette packet into four pieces. The cut tobacco conveying device 5 is used for transporting cut tobacco.

[0037] The edge computing module 2 is connected to the image acquisition module 1. The image acquisition module 1 is used for acquiring images of the cut tobacco transported by the cut tobacco conveying device 5, and the edge computing module 2 is used for processing the acquired image data.

[0038] The image acquisition module 1 includes a camera 101, an ultraviolet light source 102, and a photoelectric switch 103. The shooting area of the camera 101 coincides with the illumination area of the ultraviolet light source. The photoelectric switch 103 is installed on one side of the cut tobacco conveying device 5. The camera 101, the ultraviolet light source 102, and the photoelectric switch 103 are respectively connected to the edge computing device 2;

[0039] A photoelectric switch is a sensor that uses the photoelectric conversion effect to realize the detection of the approach of an object. The signal output interface of the photoelectric switch is connected to the input interface of a single-chip microcomputer. The VCC interface of the photoelectric switch is connected to the positive pole of the single-chip microcomputer, and the GND interface is connected to the negative pole of the single-chip microcomputer. The photoelectric switch 103 is used to output a signal to the single-chip microcomputer when it senses that the cut tobacco reaches the shooting area of the camera 101. After receiving the signal, the single-chip microcomputer triggers the camera 101 to take an image.

[0040] The ultraviolet light source 102 is set to the normally open state to prevent damage caused by frequent turning on of the ultraviolet light source 102. The ultraviolet light source 102 is used for irradiating the monitoring point with ultraviolet light.

[0041] The monitoring system provided by the present utility model includes an ultraviolet light source and a camera. The ultraviolet light source irradiates the cut tobacco to be detected with ultraviolet light, and the camera takes an image of the cut tobacco under ultraviolet irradiation and then sends it to the edge computing device for analysis. On the one hand, the ultraviolet light source has the effect of sterilization and disinfection. On the other hand, the principle that molds will show a special fluorescence reaction under the irradiation of the ultraviolet light source is used to improve the accuracy of mildew detection.

[0042] Molds contain luciferin, a substance that can absorb ultraviolet light and then radiate visible light; different types of molds exhibit different fluorescent colors under the irradiation of an ultraviolet light source, such as green, blue, etc., and may also be other colors, which are not particularly limited in this embodiment.

[0043] As Figure 2 shown, the edge computing module 2 includes a single-chip microcomputer, an image processing chip, and a communication module. The single-chip microcomputer is electrically connected to the image processing chip, the communication module, the camera, the ultraviolet light source, and the optoelectronic switch respectively, and the single-chip microcomputer is connected to the upper computer through the communication module.

[0044] After receiving the signal sent by the optoelectronic switch, the single-chip microcomputer emits a pulse to the camera. The camera receives the pulse signal of the single-chip microcomputer and transmits the captured image to the single-chip microcomputer in the form of a digital signal. The single-chip microcomputer then transmits the image captured by the camera to the image processing chip for feature extraction and analysis to detect whether the cut tobacco is mildewed; if mildew of the cut tobacco is detected, the image processing chip sends a signal to the single-chip microcomputer, and the single-chip microcomputer controls the alarm module to act after receiving the signal; the single-chip microcomputer can transmit the captured image and the processing result to the upper computer through the communication module.

[0045] In this embodiment, considering that the bandwidth required for image transmission is relatively large and transmission lag is likely to occur, an image processing chip is used for image processing, which ensures the effectiveness of image processing and data transmission.

[0046] As a further technical solution, the model of the single-chip microcomputer is STM32F103C8T6. STM32F103C8T6 has more powerful floating-point operation capabilities and caches than other types of component controllers, and has rich peripheral devices and interfaces; the single-chip microcomputer is equipped with a power button, a reset button, multiple serial communication interfaces, I / O ports, a camera interface, a display interface, and peripheral circuits, etc.

[0047] The single-chip microcomputer does not have the ability of edge computing, that is, it can only perform basic data acquisition and transmission. The single-chip microcomputer transmits the collected image data to the image processing chip for image processing through a serial communication method.

[0048] The single-chip microcomputer and the image processing chip FPGA are connected through TX (transmission) and RX (reception) pins. The single-chip microcomputer sends data to the FPGA through the serial port. After the FPGA receives the data, it processes the data and then sends the processed data to the single-chip microcomputer through the serial port.

[0049] The image processing chip is an FPGA, with the model of EP1C3T144 of the CycIone series. After the FPGA is configured, it can perform operations such as image analysis and color feature extraction through image processing algorithms, and the FPGA is controlled by a single-chip microcomputer. This utility model uses an FPGA for image analysis, which can improve the speed of image processing and greatly enhance the real-time performance of image processing compared with transmitting the images to a host computer for image processing.

[0050] In this embodiment, considering that when the cut tobacco mildews, the image color will change under ultraviolet irradiation, the color features of the image are extracted by the image processing chip, and whether the cut tobacco mildews is judged by judging the color features, that is, whether a large area of fluorescent color appears, which improves the detection efficiency of cut tobacco mildew and solves the problem of low efficiency of the existing manual detection method.

[0051] This embodiment selects a low-power and high-performance FPGA image processing chip for image processing. The FPGA image processing chip is equipped with existing image processing algorithms and does not involve the improvement of computer programs.

[0052] As a further technical solution, the communication module is a ZigBee wireless communication module, and the ZigBee wireless communication module is connected to the single-chip microcomputer through an SPI interface.

[0053] The ZigBee communication module includes a ZigBee transmitter and a ZigBee receiver; the single-chip microcomputer is connected to the ZigBee transmitter, and the ZigBee receiver is connected to the host computer. The host computer reads the serial port data by writing a program. After the host computer reads the data, the data is stored in the database. This utility model uses the ZigBee communication module to achieve wireless transmission, and both the transmission speed and the transmission distance meet the design requirements.

[0054] In this embodiment, the single-chip microcomputer and the ZigBee transmitter are encapsulated in an aluminum alloy box, and dust prevention treatment is carried out to prevent tobacco dust from entering the box and affecting the performance of electronic devices. Then, the encapsulated box and the image acquisition module are installed at the monitoring point through a bracket and then debugged.

[0055] As a further technical solution, an alarm module is also included. The alarm module is connected to the I / O port of the single-chip microcomputer, and the alarm module is used to send an alarm signal when cut tobacco mildew is detected.

[0056] In this embodiment, the alarm module can be selected as devices such as a buzzer and an indicator light, which are used to give a sound or light reminder when cut tobacco mildew is detected.

[0057] As a further technical solution, a liquid crystal display screen 3 is also included. The liquid crystal display screen 3 is arranged on the bracket, and various display functions are realized by setting the liquid crystal display screen.

[0058] As a further technical solution, the field of view of the camera 101 is perpendicular to the advancing direction of the cut tobacco conveying device 5, and the camera 101 is an MV-CS200-10GM high-speed camera; the ultraviolet light source 102 is an ultraviolet lamp tube, and both the high-speed camera and the ultraviolet lamp tube are connected to the single-chip microcomputer.

[0059] The camera 101 is used to collect ultraviolet image data of the corresponding monitoring points on the cut tobacco conveying device, and the collected image data is transmitted to the edge computing device 2. The single-chip microcomputer of the edge computing device 2 transmits the image data to the image processing chip, and image processing is performed through the image processing chip. The result of the image processing is transmitted to the single-chip microcomputer. When cut tobacco mildew is detected, the single-chip microcomputer controls the alarm module and the LED display screen to give a prompt.

[0060] As a further technical solution, the cut tobacco conveying device 5 can be a conveying device such as a belt conveyor or a roller conveyor. The type of the cut tobacco conveying device can be selected according to needs and will not be elaborated here.

[0061] As a further technical solution, the bracket 4 is a height-adjustable bracket, and the adjustment structure can be selected from bolt adjustment, sliding component adjustment, etc.; the installation height of the image acquisition module is adjusted through the height-adjustable bracket, and the adjustment structure can be selected according to needs and will not be elaborated here.

[0062] The working principle of the present utility model is as follows: The monitoring system is installed at the position to be detected through the bracket, and the ultraviolet light source is turned on to irradiate the detection point with ultraviolet light; when the photoelectric switch detects that an object passes by, the photoelectric switch outputs a signal to the single-chip microcomputer, and the single-chip microcomputer controls the camera to take a picture. At the same time, the taken picture is transmitted to the image processing chip through the single-chip microcomputer. The image processing chip performs preprocessing such as supplementary light color rendering, color feature extraction and analysis on the image, and then transmits the analysis result to the single-chip microcomputer. The single-chip microcomputer controls the alarm module and the LED display screen to give a mildew prompt according to the image analysis result to prompt relevant personnel to handle it in time; and the single-chip microcomputer can also transmit the collected image data and the analysis result of the image to the host computer through the communication module. After the host computer reads the data, the data is stored in the database.

[0063] Although the specific implementation manners of the present utility model are described above in conjunction with the accompanying drawings, it is not a limitation to the protection scope of the present utility model. Those skilled in the art should understand that based on the technical solutions of the present utility model, various modifications or deformations that can be made by those skilled in the art without creative labor are still within the protection scope of the present utility model.

Claims

1. A tobacco mildew ultraviolet online monitoring system, characterized in that: It includes an image acquisition module, an edge computing module and a cigarette sheet conveying device; The image acquisition module is installed above the tobacco sheet conveying device through a bracket, and the image acquisition module includes a camera, an ultraviolet light source and a photoelectric switch; The shooting area of ​​the camera coincides with the illumination area of ​​the ultraviolet light source, the photoelectric switch is installed on one side of the cigarette conveying device, and the camera, ultraviolet light source and photoelectric switch are respectively connected to the edge computing module.

2. The ultraviolet online monitoring system for tobacco mildew according to claim 1 is characterized in that: The edge computing module includes a single-chip microcomputer, an image processing chip and a communication module, and the single-chip microcomputer is electrically connected to the image processing chip and the communication module respectively; The image processing chip is used to extract color features from the collected pictures, and the single chip microcomputer transmits the collected pictures and the processing results of the image processing chip to the host computer through the communication module.

3. The ultraviolet online monitoring system for tobacco mildew according to claim 2, characterized in that: The communication module is a ZigBee wireless communication module, and the ZigBee wireless communication module is connected to the single-chip microcomputer via an SPI interface.

4. The ultraviolet online monitoring system for tobacco mildew according to claim 2, characterized in that: The image processing chip is a FPGA chip.

5. The ultraviolet online monitoring system for tobacco mildew according to claim 1, characterized in that: The cigarette sheet conveying device is a belt conveyor.

6. The ultraviolet online monitoring system for tobacco mildew according to claim 5, characterized in that: The sheet tobacco conveying device is arranged at the output end of the cigarette pack slicing device and is used for conveying sheet tobacco leaves.

7. The ultraviolet online monitoring system for tobacco mildew according to claim 1, characterized in that: The camera is a MV-CS200-10GM high-speed camera.

8. The ultraviolet online monitoring system for tobacco mildew according to claim 1, characterized in that: The ultraviolet light source is an ultraviolet lamp.

9. The ultraviolet online monitoring system for tobacco mildew according to claim 1, characterized in that: The field of view of the camera is perpendicular to the advancing direction of the cigarette sheet conveying device.

10. The ultraviolet online monitoring system for tobacco mildew according to claim 1, characterized in that: The bracket is a height-adjustable bracket.

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