Tobacco shred winnowing equipment and control method thereof

Abstract

According to the tobacco shred winnowing equipment and the control method thereof, the stem sliver winnowing separation efficiency is improved through equipment improvement and parameter optimization, the stem sliver separation efficiency and the tobacco shred recycling rate are improved, and balanced development of tobacco shred product quality and material consumption is achieved. A plurality of temperature and humidity sensors and density sensors are arranged in the feeding vibration groove; and a CCD high-speed camera is arranged at the top of the high-speed belt. The box type winnowing device comprises a winnowing box body, an S-shaped air conveying pipeline, a material collecting bin, an air return pipeline and a circulating fan which are connected in sequence. A first air inlet valve and a second air inlet valve are respectively arranged on a horizontal air inlet and a vertical air inlet of the winnowing box body, the horizontal air inlet and the vertical air inlet are connected with an air outlet pipe of a circulating fan, and an electric heater is arranged on the air outlet pipe connected with the vertical air inlet. The control system processes collected data obtained by the temperature and humidity sensor, the density sensor and the CCD high-speed camera and then controls the air inlet speed of the horizontal air inlet and the vertical air inlet and the rotating speed of the high-speed belt.

Description

Technical Field

[0001] The present invention relates to the field of tobacco wind selection, and in particular to a tobacco wind selection device and a control method thereof. Background Art

[0002] In the cigarette manufacturing process, the separation of tobacco stems is concentrated in two key stages: silk making and wrapping. The separation processes mainly include air selection, vibration screening and composite processes, among which air selection is the mainstream process for separating tobacco stems. For example, the patent application with publication number CN105396782B discloses a high-efficiency tobacco wind selection method and equipment, which uses conveying air to send tobacco materials into a wind selection chamber, where tobacco materials are loosened and evenly distributed in the wind selection chamber by a material distribution roller; wind selection air is introduced into the wind selection chamber, and tobacco materials are suspended and wind-selected in the wind selection chamber to separate impurities; at the same time, the agglomerated tobacco materials are suspended on the wind distribution plate in the wind selection chamber, and are repeatedly shaken and loosened under the action of upward wind selection air and gravity.

[0003] It has at least the following defects:

[0004] 1. The material roller contacts the tobacco material for a short time, which makes it difficult to achieve the effect of thinning and de-agglomerating the tobacco. After passing through the material roller, there are already many clumped tobacco leaves.

[0005] 2. When the air door opening is small, a large number of blades will be removed; when the air door opening is large, the wet ball removal effect is poor and intelligent control cannot be achieved;

[0006] 3. The condition of incoming tobacco materials is unclear, making it difficult to strike a balance between tobacco loss and purity. Summary of the invention

[0007] The purpose of the present invention is to provide a tobacco wind selection device and a control method thereof, to improve the efficiency of wind selection and separation of stems and tobacco leaves by improving the equipment and providing a parameter optimization method, to ensure the balanced relationship between tobacco loss and purity, and to use a composite process combining image recognition and wind selection to bring a more accurate and intelligent solution for stem and tobacco separation to the cigarette industry, to improve the efficiency of stem and tobacco separation and the recycling rate of tobacco, and to achieve a balanced development of tobacco product quality and material consumption.

[0008] The embodiment of the present invention is achieved as follows:

[0009] A tobacco wind selection device, the tobacco wind selection device comprises a feed vibration trough, a high-speed belt, a box-type wind selector and a control system which are arranged in sequence, a plurality of temperature and humidity sensors and a density sensor are arranged in the feed vibration trough; a thinning assembly is arranged at the front end of the high-speed belt, two groups of LED light sources and a group of CCD high-speed cameras are arranged at the top of the high-speed belt; the box-type wind selector comprises a wind selection box body, an S-shaped air delivery pipeline, a collection bin, a return air pipeline, and a circulating fan which are connected in sequence, the feed end of the wind selection box body is located below the discharge port of the high-speed belt, the wind selection box body is provided with a horizontal air inlet and a vertical air inlet, the horizontal air inlet and the vertical air inlet are provided The straight air inlet is respectively provided with a first air inlet valve and a second air inlet valve; the horizontal air inlet and the vertical air inlet are connected to the air outlet duct of the circulating fan; the air outlet duct connected to the vertical air inlet is provided with an electric heater; the S-shaped air delivery pipeline is also provided with an air supply fan and a dehumidifier; a dropper is obliquely provided at the top of the aggregate bin, and the dropper is provided with a compressed air jet device for spraying toward the bottom of the aggregate bin; the control system controls the air inlet speed of the horizontal air inlet and the vertical air inlet, as well as the rotation speed of the high-speed belt after processing the collected data obtained by the temperature and humidity sensor, the density sensor and the CCD high-speed camera.

[0010] As a preferred technical solution, the above-mentioned wire spreading assembly includes multiple groups of connecting gantries, both ends of which are connected by a rotating seat, flattening rollers are suspended from the connecting gantries, and comb teeth are arranged on the flattening plate.

[0011] As a preferred technical solution, the two groups of LED light sources mentioned above adopt linear array full-spectrum light sources.

[0012] As a preferred technical solution, a shearing roller is provided at the center of the bending section of the above-mentioned S-shaped air delivery pipeline, and the surface of the shearing roller is provided with shearing teeth distributed in a circumferential array.

[0013] As a preferred technical solution, an electric heater is provided in the air inlet pipe of the vertical air inlet.

[0014] The present invention also provides a control method for tobacco winnowing equipment, comprising any of the tobacco winnowing equipment described above, wherein the control system comprises a data acquisition unit, an image processing unit, a data analysis and processing unit, a case clustering unit, a control correction unit and a PLC control unit;

[0015] The control method of tobacco wind selection equipment includes:

[0016] The image processing unit at least obtains image data after the high-speed belt further spreads the tobacco, and obtains images of the current batch based on images collected by the CCD high-speed camera, and calculates the average width, length, curl, clumping rate, uniformity, and impurity rate of the tobacco based on the images;

[0017] The data acquisition unit at least obtains the effective tobacco temperature and humidity data, the bulk density data and the output data of the image processing unit in the feed vibration trough, as well as the feed speed of the high-speed belt, the horizontal air inlet speed, the vertical air inlet speed, the comprehensive wind speed of the S-shaped air delivery pipeline, the power of the circulating fan, and the power data of the compressed air jet device;

[0018] The data analysis and processing unit and the case clustering unit obtain the output data of the data collection unit, and calculate the calculated output value and the recommended output value according to the output data;

[0019] The control correction unit obtains a correction value according to the calculated output value and the recommended output value according to the weight synthesis model, and inputs the correction value into the PLC control unit to complete the control.

[0020] As a preferred technical solution, the above-mentioned image processing unit includes:

[0021] Image acquisition module, using CCD high-speed camera to take images of tobacco spread on the high-speed belt;

[0022] Image preprocessing module, which preprocesses the collected images, including image clipping, grayscale, noise removal, and contrast enhancement;

[0023] The feature extraction unit extracts the features of tobacco, debris and clumped tobacco based on edge detection combined with cluster center algorithm;

[0024] The classifier training unit uses a deep learning model to train the classifier. The classifier dataset contains historically labeled tobacco shreds, tobacco stems, and clumping tobacco shreds data.

[0025] A classification and recognition unit, which classifies and recognizes the image to be recognized;

[0026] The verification unit verifies the identification structure and calculates the average width, length, curl, clumping rate, uniformity and impurity rate data of the tobacco.

[0027] As a preferred technical solution, after the data analysis and processing unit obtains the average tobacco width, length, curl, clumping rate, uniformity and impurity rate data of the tobacco, it obtains the calculated output values ​​of the feeding speed, horizontal air inlet speed and vertical air inlet speed of the high-speed belt through statistical verification and maximum correlation analysis; and then obtains the recommended output value according to the maximum correlation analysis in the case clustering unit.

[0028] As a preferred technical solution, the calculation method of the control correction unit includes:

[0029] When both the output calculation value and the recommended output value are within the preset target threshold range, the output calculation value and the recommended output value are imported into the weight synthesis model to obtain the correction value; when one of the output calculation value and the recommended output value is within the target threshold range, the value within the target threshold range is selected as the correction value; when both the output calculation value and the recommended output value are not within the target threshold range, the median value of the target threshold range is taken as the correction value.

[0030] As a preferred technical solution, the PLC control unit receives the correction value and controls the circulating fan power, the compressed air jet device, the air supply fan, the dehumidifier, and the high-speed belt feed speed.

[0031] The beneficial effects of the embodiments of the present invention are:

[0032] 1. The tobacco shreds air selection equipment of the present invention is provided with a temperature and humidity sensor and a density sensor in the feed vibration trough, and provides control data of wind speed and wind temperature for the horizontal air inlet and the vertical air inlet of the box-type air selector by obtaining the temperature, humidity and density data of the batch of tobacco shreds, thereby preventing the wet mass in the tobacco shreds from being sent out of the separation box, causing waste of tobacco materials;

[0033] 2. After feeding the vibrating trough, the tobacco material is further flattened by the high-speed belt, and the image of the flattened tobacco is collected by the CCD high-speed camera. After recognition and calculation by the image processing unit, the average width, length, curl, agglomeration rate, uniformity and impurity rate of the batch of tobacco are measured, and the wind speed control data is provided for the horizontal air inlet and the vertical air inlet, so as to avoid the tobacco stems and impurities mixed into the tobacco and collected in the collection bin due to excessive wind speed; the tobacco is sent out of the separation box due to too low wind speed; at the same time, the image acquisition data can also provide a reference for the air supply temperature control to avoid excessive drying of tobacco and material damage caused by too fast wind speed;

[0034] 3. This control method combines expert opinions and conducts case cluster analysis through the collected data to obtain recommended wind speed and temperature adjustment values ​​obtained from similar historical situations. After correction through calculated output values ​​and recommended output values, appropriate horizontal inlet wind speed, vertical inlet wind speed and temperature are obtained. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the embodiments are briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without creative work.

[0036] Figure 1 This is a schematic diagram of the structure of a tobacco wind selection device according to the first embodiment of the present invention;

[0037] Figure 2 This is a schematic diagram of the S-shaped air delivery pipeline structure of the first embodiment of the present invention;

[0038] Figure 3 This is a schematic diagram of the structure of a thinning assembly according to the first embodiment of the present invention;

[0039] Figure 4 A schematic diagram of data processing flow of a control system of a tobacco wind selection device according to a second embodiment of the present invention;

[0040] Figure 5 This is a flow chart of the control method of the tobacco wind selection equipment according to the second embodiment of the present invention.

[0041] Icons: feeding vibration trough 1; temperature and humidity sensor 11; density sensor 12; high-speed belt 2; filament unraveling assembly 21; connecting gantry 211; rotating seat 212; flattening roller 213; comb teeth 214; cleaning roller 22; LED light source 23; CCD high-speed camera 24; box-type air selector 3; air selection box 31; S-shaped air delivery pipeline 32; S-shaped pipe section 321; extended horizontal pipe section 322; unraveling roller 323; unraveling teeth 324; air supplement fan 325; dehumidifier 326; collecting bin 33; dropper 331; compressed air jet device 332; return air pipeline 34; circulating fan 35; horizontal air inlet 36; vertical air inlet 37; screen 38; electric heater 39;

[0042] Data acquisition unit 41; image processing unit 42; data analysis and processing unit 43; case clustering unit 44; control correction unit 45; PLC control unit 46. DETAILED DESCRIPTION

[0043] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings here can be arranged and designed in various different configurations.

[0044] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention claimed for protection, but merely represents selected embodiments of the present invention. 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.

[0045] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0046] Example embodiments will now be described more fully with reference to the accompanying drawings. However, example embodiments can be implemented in a variety of forms and should not be construed as limited to the examples set forth herein; rather, these embodiments are provided so that this application will be more comprehensive and complete and fully convey the concept of the example embodiments to those skilled in the art.

[0047] In addition, described feature, structure or characteristic can be combined in one or more embodiments in any suitable manner. In the following description, many specific details are provided to provide a full understanding of the embodiments of the present application. However, those skilled in the art will appreciate that the technical scheme of the present application can be put into practice without one or more of the specific details, or other methods, components, devices, steps, etc. can be adopted. In other cases, known methods, devices, realizations or operations are not shown or described in detail to avoid blurring the various aspects of the application.

[0048] The block diagrams shown in the accompanying drawings are merely functional entities and do not necessarily correspond to physically independent entities. That is, these functional entities may be implemented in software form, or in one or more hardware modules or integrated circuits, or in different networks and / or processor devices and / or microcontroller devices.

[0049] The flowcharts shown in the accompanying drawings are only exemplary and do not necessarily include all the contents and operations / steps, nor must they be executed in the order described. For example, some operations / steps can be decomposed, and some operations / steps can be combined or partially combined, so the actual execution order may change according to actual conditions.

[0050] First embodiment

[0051] See also Figure 1-3 The present embodiment provides a tobacco wind selection device, which includes a feed vibration trough 1, a high-speed belt 2, a box-type air selector 3, and a control system arranged in sequence. The feed vibration trough 1 is used to output the tobacco material to the air selection box for air selection, and at the same time plays a role in loosening the material and pre-processing the material supply form. The high-speed belt 2 is connected to the tail of the feed vibration trough 1. Since the speed is faster than that of the feed vibration trough 1, the flattening effect of the material is thinner, and it is easier to obtain the characteristic data of tobacco and impurities, while improving the stem removal effect of leaf wind selection. The box-type air selector 3 is used for actual air selection and impurity removal.

[0052] Specifically, multiple temperature and humidity sensors 11 and density sensors 12 are arranged in the feed vibration trough 1. The multiple temperature and humidity sensors 11 and density sensors 12 can be arranged at equal intervals to obtain the average temperature and humidity and average density of the material. A material guide is arranged in the feed vibration trough 1 to evenly distribute the tobacco material.

[0053] The front section of the high-speed belt 2 is provided with a shredding assembly 21, which further breaks up the wet shredded tobacco after reaching the high-speed belt 2. The shredding assembly 21 includes a plurality of connecting gantry 211, the two ends of which are connected by a rotating seat 212, a flattening roller 213 is suspended from the connecting gantry 211, and a combing tooth 214 is provided on the flattening plate, which arranges the material on the high-speed belt 2 into a tobacco material with a uniform thickness and uniform distribution.

[0054] The high-speed belt 2 is a belt transmission component. A dark blue belt is selected to form a strong contrast with the tobacco, which facilitates image recognition of tobacco and discharge of impurities. A cleaning roller 22 is also provided at the front end of the high-speed belt 2 to help clean the high-speed belt 2 and ensure the shooting quality.

[0055] Two groups of LED light sources 23 focusing on one point and a group of CCD high-speed cameras 24 are arranged at the top of the middle section of the high-speed belt 2 to take clear images of the materials. The two groups of LED light sources 23 use linear array full-spectrum light sources, which use linear array full-spectrum light sources with continuous spectrum, wide wavelength coverage, high and stable color rendering index to replace ordinary LED light sources, thereby improving the imaging effect and contrast of debris and enhancing the ability to identify debris.

[0056] After the image is captured by the CCD high-speed camera 24, it is transmitted to the advanced image processing unit for image recognition and calculation.

[0057] The box-type air separator 3 includes an air separation box 31 connected in sequence, an S-shaped air supply pipe 32 located at the top of the air separation box 31, a collection bin 33 arranged at the end of an extended horizontal pipe section 322 of the S-shaped air supply pipe, a return air pipe 34 arranged at the top of the collection bin 33, and a circulating fan 35 connecting the return air pipe 34 and the air inlet of the risk box.

[0058] The S-shaped air delivery pipe includes an S-shaped pipe section 321 and an extended horizontal pipe section 322. A shredding roller 323 is arranged at the center of the bending section of the S-shaped air delivery pipe 32. The surface of the shredding roller 323 is provided with shredding teeth 324 distributed in a circumferential array, which further improves the looseness of the tobacco shreds and provides a barrier for foreign materials such as tobacco stems.

[0059] The feeding end of the air separation box 31 is located below the discharge port of the high-speed belt 2, and a vertical feeding method is adopted. The air separation box 31 is provided with a horizontal air inlet 36 and a vertical air inlet 37, wherein the horizontal air inlet 36 is higher than the vertical air inlet 37, and a plurality of layers of inclined screens 38 are provided at the bottom of the vertical air inlet 37, and a separation box is provided at the bottom of the screen 38 for storing separated tobacco stems and debris, and the separation box is provided below the vertical air inlet 37.

[0060] A first air inlet valve and a second air inlet valve are respectively provided on the horizontal air inlet 36 and the vertical air inlet 37 to facilitate the control of the wind speed of the horizontal air inlet 36 and the vertical air inlet 37. The horizontal air inlet 36 and the vertical air inlet 37 are connected to the air outlet duct of the circulating fan 35. An electric heater 39 is provided in the air inlet duct of the vertical air inlet 37 to further dry the wet mass when the humidity is high.

[0061] Furthermore, in order to better separate the wet tobacco clumps, two vertical air inlets can be set, where the wind speed at the end where the screen 38 is located lower is higher than the wind speed at the end where the screen 38 is located higher, so that the efficiency of processing the wet clumps is improved through secondary processing.

[0062] The S-shaped air delivery pipeline 32 is also provided with an air supply fan 325 and a dehumidifier 326, which are used to supply air flow when the second air inlet valve is opened and to dehumidify when the electric heater 39 is turned on. The air supply fan 325 is an axial flow fan or a centrifugal fan that can be used as both an air supply device and an air exhaust device.

[0063] A dropper 331 is provided at an angle on the top of the collecting bin 33 for introducing tobacco shreds into the collecting bin. A compressed air jet device 332 is provided on the dropper 331 for spraying toward the bottom of the collecting bin 33 to prevent blockage of the return air flow.

[0064] The control system controls the air inlet speed of the horizontal air inlet 36 and the vertical air inlet 37, the air inlet temperature of the vertical air inlet 37, and the rotation speed (feeding speed) of the high-speed belt 2 after processing the collected data obtained by the temperature and humidity sensor 11, the density sensor 12 and the CCD high-speed camera 24.

[0065] The operation mode of the tobacco wind selection equipment in this embodiment is:

[0066] The average temperature, humidity and density of the tobacco shreds are measured at the feed vibration trough 1; the average width, length, curl, agglomeration rate, uniformity and impurity rate of the further flattened tobacco shreds are measured at the high-speed belt 2;

[0067] The measurement data is transmitted to the control system, and after comprehensive calculation and analysis, the running speed (feeding speed) of the high-speed belt 2, the opening degree of the first air inlet valve and the second air inlet valve (controlling the wind speed of the horizontal air inlet 36 and the vertical air inlet 37), and the heating power of the electric heater 39 (controlling the temperature of the vertical air inlet 37) are controlled.

[0068] For example, when the humidity and density of the tobacco at the feeding vibration groove 1 are high, the control system slows down the running speed of the high-speed belt 2, controls the first air inlet valve, the second air inlet valve and the electric heater 39 to open, increases the wind speed and temperature at the vertical air inlet 37, and dries the wet tobacco mass falling on the screen 38 with hot air. The tobacco enters the S-shaped air delivery pipeline 32 under the action of the vertical air inlet and is collected. At the same time, when the second air inlet valve and the electric heater 39 are opened, the corresponding air supplement fan 325 and the dehumidifier 326 are opened to prevent the humidity of the collected tobacco from exceeding the standard.

[0069] When the humidity of the tobacco at the feeding vibration trough 1 is moderate but the density is high, the control system controls the high-speed belt 2 to feed normally, and at the same time controls the first air inlet valve and the second air inlet valve to open, increasing the wind speed at the vertical air inlet 37, and a small number of wet tobacco clumps after the first air selection at the horizontal air inlet 36 enter the area between the screen 38 and the horizontal air inlet 36. The vertical wind that is turned on at this time can help the wet tobacco clumps to dry, thereby preventing the wet tobacco clumps from being discharged. When the second air inlet valve is opened, the air supplement fan 325 is turned on synchronously.

[0070] When the humidity of the tobacco at the feeding vibration groove 1 is low but the density is high, the control system only opens the first air inlet valve and accelerates the feeding speed of the high-speed belt 2 at the same time.

[0071] To sum up, the tobacco air selection equipment provided in this embodiment is provided with a temperature and humidity sensor 11 and a density sensor 12 in the feed vibration trough 1, and provides control reference data of wind speed and wind temperature for the horizontal air inlet 36 and the vertical air inlet 37 of the box-type air selector 3 by obtaining the temperature, humidity and density data of the batch of tobacco, thereby preventing wet clumps in the tobacco from being sent out of the separation box, causing waste of tobacco materials, and improving the tobacco air selection accuracy.

[0072] Second embodiment

[0073] See also Figure 4 and 5 This embodiment is based on the tobacco wind selection device in the first embodiment, and further provides a control method for the tobacco wind selection device, wherein the control system includes a data acquisition unit 41, an image processing unit 42, a data analysis and processing unit 43, a case clustering unit 44, a control correction unit 45 and a PLC control unit 46;

[0074] The control method of tobacco wind selection equipment includes:

[0075] The image processing unit 42 at least obtains image data after the high-speed belt 2 further spreads the tobacco, and obtains the image of the current batch based on the image captured by the CCD high-speed camera 24, and calculates the average width, length, curl, clumping rate, uniformity, and impurity rate data of the tobacco based on the image.

[0076] The image processing unit 42 includes:

[0077] The image acquisition module uses a CCD high-speed camera 24 to capture the image of the tobacco after it is spread on the high-speed belt 2;

[0078] The image preprocessing module preprocesses the collected images, including image clipping, graying, noise removal, and contrast enhancement. In order to improve the calculation speed, the collected images are first clipped, and an image within the central matrix range and an image within the edge range are obtained for calculation. In this way, the data calculated from the images intercepted within the edge range can quickly obtain the average width, length, and curl of the tobacco; the images within the central matrix range can quickly obtain the data on the clumping rate, uniformity, and impurity rate.

[0079] The feature extraction unit extracts the features of tobacco, debris and clumped tobacco based on edge detection combined with clustering center algorithm.

[0080] The characteristics of tobacco shreds are thin strips, small width, long length, golden yellow, orange or lemon yellow color, smooth edges, and delicate texture; the characteristics of tobacco stems are thick, short length, blue-brown or black-gray color, and rough edges; the characteristics of clumped tobacco shreds are block-shaped, hollow in the middle, and the color is consistent with the tobacco shreds. Therefore, the three different types of targets can be well identified based on binary color matching and shape matching.

[0081] The classifier training unit uses a deep learning model to train the classifier. The classifier data set contains historically labeled tobacco, tobacco stems, and clumped tobacco data. The classification and recognition unit classifies and recognizes the images to be recognized.

[0082] The verification unit verifies the identified tobacco and calculates the average width, length, curl, clumping rate, uniformity and impurity rate of the identified tobacco.

[0083] The calculation method of the average width, length and curl of the tobacco is to obtain single tobacco data through an image intercepted within the edge range, which can simply obtain the average width, length and curl of the tobacco.

[0084] The calculation method of the agglomeration rate is:

[0085] The images intercepted within the central matrix range are used to calculate the ratio of clumped tobacco to the entire intercepted image, and the central clumping rate is obtained;

[0086] The intercepted central matrix area is expanded outward to N annular rectangles of equal area; the weights of the annular rectangles are set from the inside to the outside, and the weights gradually decrease, so that the weight of the central matrix range + the weights of the N annular rectangles = 1, and the weight of the central matrix range is greater than 0.6, and the overall clustering rate is calculated.

[0087] The uniformity is calculated as:

[0088] The images captured within the central matrix range and the images captured within the edge range are obtained, and the images are processed into checkerboard images. The distribution matrix of tobacco shreds, tobacco stems and clumped tobacco shreds is calculated based on the checkerboard grid, so as to calculate the average value of each screenshot. The average value of the two screenshots is averaged to obtain the uniformity evaluation.

[0089] The calculation method of impurity rate data is:

[0090] The images captured within the central matrix range and the images captured within the edge range are obtained, and the identification data of tobacco shreds, tobacco stems and clumped tobacco shreds are obtained respectively. The identified tobacco stem area / tobacco shreds and clumped tobacco shreds area are used to obtain the impurity rate data.

[0091] The data acquisition unit 41 at least obtains the effective tobacco temperature and humidity data, stacking density data and output data of the image processing unit 42 in the feed vibration trough 1, as well as the feed speed of the high-speed belt 2, the horizontal air inlet speed, the vertical air inlet speed, the comprehensive wind speed of the S-shaped air delivery pipeline 32, the power of the circulating fan 35, and the power data of the compressed air jet device 332.

[0092] The data analysis and processing unit 43 and the case clustering unit 44 obtain the output data of the data acquisition unit 41, and respectively calculate the calculated output value and the recommended output value according to the output data.

[0093] After the data analysis and processing unit 43 obtains the average width, length, curl, clumping rate, uniformity and impurity rate data of the tobacco shreds, it obtains the calculated output values ​​of the feed speed, horizontal air inlet speed and vertical air inlet speed of the high-speed belt 2 through statistical verification and correlation maximum value analysis.

[0094] For example, when the tobacco clumping rate obtained by the image processing unit is high, the control system slows down the running speed of the high-speed belt 2, controls the first air inlet valve, the second air inlet valve and the electric heater 39 to be opened, increases the wind speed and temperature at the vertical air inlet 37, and dries the wet tobacco clumps falling on the screen 38 with hot air, and then the tobacco clumps enter the S-shaped air delivery pipeline 32 under the action of the vertical air inlet to be collected. At the same time, when the second air inlet valve and the electric heater 39 are opened, the corresponding air supplement fan 325 and the dehumidifier 326 are opened to prevent the wet tobacco clumps from being removed by air selection.

[0095] When the uniformity of the shredded tobacco obtained by the image processing unit is low, the running speed of the high-speed belt 2 is appropriately increased, and the air outlet speed of the horizontal air inlet 36 and / or the vertical air inlet 37 is appropriately reduced.

[0096] When the tobacco impurity rate obtained by the image processing unit is high, the wind speed at the horizontal air inlet is appropriately reduced, the wind speed at the vertical air inlet is increased, and the running speed of the high-speed belt and the feed vibration trough is appropriately slowed down.

[0097] Then, the case clustering unit 44 obtains the recommended output value according to the maximum correlation value analysis.

[0098] The control correction unit 45 obtains a correction value according to the calculated output value and the recommended output value according to the weight synthesis model, and inputs the correction value to the PLC control unit 46 to complete the control.

[0099] The calculation method of the control correction unit 45 includes:

[0100] When both the output calculation value and the recommended output value are within the preset target threshold range, the output calculation value and the recommended output value are imported into the weight synthesis model to obtain the correction value; when one of the output calculation value and the recommended output value is within the target threshold range, the value within the target threshold range is selected as the correction value; when both the output calculation value and the recommended output value are not within the target threshold range, the median value of the target threshold range is taken as the correction value.

[0101] As a preferred technical solution, the PLC control unit 46 receives the correction value and controls the power of the circulating fan 35, the compressed air jet device 332, the air supply fan 325, the dehumidifier 326, the feed speed of the high-speed belt 2, the electric heater 39, etc.

[0102] In this embodiment, the tobacco material is further flattened by the high-speed belt 2 after the feeding vibration trough 1, and the image of the flattened tobacco is collected by the CCD high-speed camera. After recognition and calculation by the image processing unit 42, the average width, length, curl, clumping rate, uniformity, and impurity rate data of the batch of tobacco are measured, and the wind speed control data is provided for the horizontal air inlet 36 and the vertical air inlet 37, so as to avoid tobacco stems and impurities mixed into the tobacco and collected in the collection bin 33 due to excessive wind speed; the wind speed is too low and the tobacco is sent out of the separation box; at the same time, the image acquisition data can also provide a reference for the air supply temperature control to avoid excessive drying of the tobacco and material damage caused by excessive wind speed.

[0103] At the same time, the control method provided in this embodiment combines expert opinions, performs case clustering analysis through the collected data, obtains recommended wind speed and temperature adjustment values ​​obtained from similar historical situations, and then obtains appropriate horizontal inlet wind speed, vertical inlet wind speed and temperature after correction by calculating the output value and the recommended output value.

[0104] Those of ordinary skill in the art will appreciate that the units and algorithm steps of each example described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, computer software, or a combination of the two. In order to clearly illustrate the interchangeability of hardware and software, the composition and steps of each example have been generally described in terms of function in the above description. Whether these functions are performed in hardware or software depends on the specific application and design constraints of the technical solution. Professional and technical personnel can use different methods to implement the described functions for each specific application, but such implementation should not be considered to be beyond the scope of the present invention.

[0105] In the several embodiments provided in the present application, it should be understood that the disclosed devices and methods can be implemented in other ways. For example, the device embodiments described above are only schematic. For example, the division of the units is only a logical function division. There may be other division methods in actual implementation, such as multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. In addition, the mutual coupling or direct coupling or communication connection shown or discussed can be an indirect coupling or communication connection through some interfaces, devices or units, or it can be an electrical, mechanical or other form of connection.

[0106] The units described as separate components may or may not be physically separated. As a unit, it can be appreciated by those skilled in the art that the units and algorithm steps of each example described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, computer software, or a combination of the two. In order to clearly illustrate the interchangeability of hardware and software, the composition and steps of each example have been generally described in terms of function in the above description. Whether these functions are performed in hardware or software depends on the specific application and design constraints of the technical solution. Professional and technical personnel can use different methods to implement the described functions for each specific application, but such implementation should not be considered to be beyond the scope of the present invention.

[0107] In addition, each functional unit in each embodiment of the present invention may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit. The above-mentioned integrated unit may be implemented in the form of hardware or in the form of software functional units.

[0108] If the integrated unit is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present invention is essentially or the part that contributes to the prior art, or all or part of the technical solution can be embodied in the form of a software product, and the computer software product is stored in a storage medium, including a number of instructions for a computer device (which can be a personal computer, a server, or a grid device, etc.) to perform all or part of the steps of the method described in each embodiment of the present invention. The aforementioned storage medium includes: U disk, mobile hard disk, read-only memory (ROM, Read-Only Memory), random access memory (RAM, Random Access Memory), disk or optical disk and other media that can store program codes.

[0109] Obviously, the described embodiments are only some embodiments of the present invention, not all 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.

Claims

1. A tobacco wind selection device, characterized in that: The tobacco wind selection equipment comprises a feed vibration trough, a high-speed belt, a box-type wind selector and a control system which are arranged in sequence. A plurality of temperature and humidity sensors and a density sensor are arranged in the feed vibration trough; a thinning assembly is arranged at the front end of the high-speed belt, and two groups of LED light sources and a group of CCD high-speed cameras are arranged on the top of the high-speed belt; the box-type wind selector comprises a wind selection box, an S-shaped air delivery pipeline, a collection bin, a return air pipeline, and a circulating fan which are connected in sequence. The feed end of the wind selection box is located below the discharge port of the high-speed belt, and the wind selection box is provided with a horizontal air inlet and a vertical air inlet. A first air inlet valve and a second air inlet valve are respectively provided on the horizontal air inlet and the vertical air inlet, the horizontal air inlet and the vertical air inlet are connected to the air outlet duct of the circulating fan, and an air supply fan and a dehumidifier are also provided on the S-shaped air delivery pipeline. A dropper is obliquely provided on the top of the aggregate bin, and a compressed air jet device for spraying toward the bottom of the aggregate bin is provided on the dropper; the control system controls the air inlet speed of the horizontal air inlet and the vertical air inlet, and the rotation speed of the high-speed belt after processing the collected data obtained by the temperature and humidity sensor, the density sensor and the CCD high-speed camera.

2. The tobacco wind selection equipment according to claim 1, characterized in that: The wire spreading assembly comprises a plurality of groups of connecting gantries, two ends of the connecting gantries are connected via a rotating seat, flattening rollers are suspended from the connecting gantries, and comb teeth are arranged on the flattening plate.

3. The tobacco wind selection equipment according to claim 1, characterized in that: The two groups of LED light sources adopt linear array full-spectrum light sources.

4. The tobacco wind selection equipment according to claim 1, characterized in that: A wire shedding roller is arranged at the center of the bending section of the S-shaped air delivery pipeline, and a wire shedding roller is arranged on the surface of the wire shedding roller with wire shedding teeth distributed in a circumferential array.

5. The tobacco wind selection equipment according to claim 1, characterized in that: An electric heater is arranged in the air inlet pipe of the vertical air inlet.

6. A control method for tobacco wind selection equipment, comprising the tobacco wind selection equipment according to any one of claims 1 to 5, characterized in that: The control system includes a data acquisition unit, an image processing unit, a data analysis and processing unit, a case clustering unit, a control correction unit and a PLC control unit; The control method of the tobacco wind selection equipment comprises: The image processing unit at least obtains image data after the high-speed belt further spreads the tobacco, and obtains images of the current batch based on the images collected by the CCD high-speed camera, and calculates the average width, length, curl, clumping rate, uniformity, and impurity rate of the tobacco based on the images; The data acquisition unit at least acquires the effective tobacco temperature and humidity data, the bulk density data and the output data of the image processing unit in the feed vibration trough, as well as the feed speed of the high-speed belt, the horizontal air inlet speed, the vertical air inlet speed, the comprehensive wind speed of the S-shaped air delivery pipeline, the power of the circulating fan, and the power data of the compressed air jet device; The data analysis and processing unit and the case clustering unit obtain the output data of the data acquisition unit, and calculate the calculated output value and the recommended output value according to the output data; The control correction unit obtains a correction value according to the calculated output value and the recommended output value according to a weight synthesis model, and inputs the correction value into a PLC control unit to complete control.

7. The control method of tobacco wind selection equipment according to claim 6, characterized in that: The image processing unit comprises: Image acquisition module, using CCD high-speed camera to take images of tobacco spread on the high-speed belt; An image preprocessing module performs preprocessing on the collected images, including image clipping, grayscale conversion, noise removal, and contrast enhancement; The feature extraction unit extracts the features of tobacco, debris and clumped tobacco based on edge detection combined with cluster center algorithm; A classifier training unit, which uses a deep learning model to train a classifier, wherein the classifier data set includes historically annotated tobacco shreds, tobacco stems, and clumped tobacco shreds data; A classification and recognition unit, which classifies and recognizes the image to be recognized; The verification unit verifies the identification structure and calculates the average width, length, curl, clumping rate, uniformity and impurity rate data of the tobacco.

8. The control method of tobacco wind selection equipment according to claim 6, characterized in that: After the data analysis and processing unit obtains the average tobacco width, length, curl, clumping rate, uniformity and impurity rate data of the tobacco, it obtains the calculated output values ​​of the feeding speed, horizontal air inlet speed and vertical air inlet speed of the high-speed belt through statistical verification and maximum correlation analysis; then the case clustering unit obtains the recommended output value according to the maximum correlation analysis.

9. The control method of tobacco wind selection equipment according to claim 6, characterized in that: The calculation method of the control correction unit includes: When the output calculation value and the recommended output value are both within the preset target threshold range, the output calculation value and the recommended output value are imported into the weight synthesis model to obtain a correction value; when one of the output calculation value and the recommended output value is within the target threshold range, the value within the target threshold range is selected as the correction value; when both the output calculation value and the recommended output value are not within the target threshold range, the median value of the target threshold range is taken as the correction value.

10. The control method of tobacco wind selection equipment according to claim 6, characterized in that: The PLC control unit receives the correction value and controls the circulating fan power, compressed air jet device, air supply fan, dehumidifier, high-speed belt feed speed, and electric heater.

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