Intelligent multi-stage sorting and impurity removing system for tobacco stems

Abstract

The invention belongs to the technical field of tobacco production equipment, and particularly relates to an intelligent multi-stage sorting and impurity removing system for tobacco stems, which comprises three stages of sorting boxes which are sequentially connected in series, and the widths and heights of the three stages of sorting boxes in the transverse direction are sequentially increased; a first material guide separation plate and a second material guide separation plate are arranged at the lower part in the first-stage separation box, and a third material guide separation plate and a fourth material guide separation plate are arranged at the lower part in the second-stage separation box; a fifth material guiding and separating plate is arranged at the lower part in the third-stage sorting box; a first air volume adjusting assembly is arranged above the connecting position of the first-stage sorting box and the second-stage sorting box, and a second air volume adjusting assembly is arranged above the connecting position of the second-stage sorting box and the third-stage sorting box. And the side upper part of the third-stage sorting box is connected with a dust removal system through a pipeline. According to the technical scheme, the multi-stage sorting and impurity removing system has the self-learning function, the data model can be autonomously perfected and optimized, adjustment is more accurate, and sorting is more accurate.

Description

Technical Field

[0001] The invention belongs to the technical field of tobacco production equipment, and particularly relates to an intelligent multi-stage sorting and impurity removing system for tobacco stems. Background Art

[0002] Tobacco stems account for about 25% of the total weight of tobacco leaves and are important cigarette raw materials. Scientific and efficient processing of tobacco stems can reduce the tar content of cigarettes and enrich the flavor of cigarette products. At the same time, in order to make full use of raw materials and reduce waste, cut tobacco has been used in cigarettes of all grades. However, there are difficult-to-process stem bends in the tobacco stems entering the stem cutting production line of the cigarette factory, and various heavy and light impurities are also mixed. Stem bends are very different from qualified tobacco stems in terms of shape, composition, and performance. The existence of stem bends will affect the processing of qualified tobacco stems in processes such as stem conditioning, stem pressing, stem cutting, and expansion drying, and is prone to produce stem chips, seriously affecting the quality of cut tobacco and should be removed; the heavy and light impurities mixed in tobacco stems, such as metal objects, stones, paper sheets, hemp ropes, and dust, will seriously affect the purity of cut tobacco and must be removed completely.

[0003] The current measures for removing stem bends and heavy and light impurities are to use multiple devices in series, which have problems such as large floor area, high energy consumption, and complex maintenance. The "Device for Separating and Removing Impurities from Cut Tobacco (Publication No.: CN208144394U)" that has been published only applies to the separation and impurity removal of cut tobacco, can only remove stem chips and dust, cannot be used for the separation and impurity removal of tobacco stems, can only be adjusted manually, and at the same time has problems such as many transmission parts and complex maintenance; the "Device for Removing Light Impurities from Pipe-Type Tobacco Stems (Publication No.: CN107890995A)" can only remove light impurities in tobacco stems and cannot remove heavy impurities such as stem bends, metal objects, and stones. It can only be adjusted manually and requires another device to perform, resulting in the problem of single function. Therefore, a new method and system for removing stem bends and heavy and light impurities are needed, which have functions such as intelligent recognition, automatic detection, and control, achieve accurate sorting effects, and can simultaneously solve the problems of difficulty in removing stem bends and heavy and light impurities that plague the stem cutting production line. Summary of the Invention

[0004] The purpose of the present invention is to provide an intelligent multi-stage sorting and impurity removing system for tobacco stems. When stem bends, heavy and light impurities, and qualified tobacco stems are flotation-selected and float-selected in the sorting box, the different flight trajectories are used to remove heavy and light impurities under the action of the separation plate at a suitable position, so as to solve the problems existing in the background art.

[0005] To achieve the above purpose, the present application is realized through the following technical solutions:

[0006] An intelligent multi-stage sorting and impurity removing system for tobacco stems includes three sequentially connected sorting boxes, and the widths and heights of the three sorting boxes increase sequentially in the horizontal direction;

[0007] The discharge port of the feeding vibration trough is located at the feeding product of the first-level sorting box, and an air inlet component is arranged below the discharge port of the feeding vibration trough;

[0008] A first material guide separation plate and a second material guide separation plate are arranged at the lower part of the first-stage sorting box, and the first material guide separation plate and the second material guide separation plate are arranged to be inclined from the stem and the heavy debris outlet to both sides;

[0009] A third material guide separation plate and a fourth material guide separation plate are arranged at the lower part of the interior of the secondary sorting box, and the third material guide separation plate and the fourth material guide separation plate are arranged obliquely from the tobacco stem outlet to both sides;

[0010] A fifth material guide and separation plate is arranged at the lower part of the interior of the three-stage sorting box, and the fifth material guide and separation plate is arranged obliquely from the light debris outlet side;

[0011] A first air volume regulating component is arranged above the connection between the first-stage sorting box and the second-stage sorting box, and a second air volume regulating component is arranged above the connection between the second-stage sorting box and the third-stage sorting box;

[0012] The upper side of the three-stage sorting box is connected to the dust removal system through a pipeline.

[0013] Furthermore, the air inlet assembly includes a drifting air inlet, at which an air volume adjustment plate and a third adjustment device are provided.

[0014] Furthermore, observation windows are provided on both sides of the first-stage sorting box, the second-stage sorting box and the third-stage sorting box.

[0015] Furthermore, the upper end of the first material guiding and separating plate is arranged at the lower edge of the drifting air inlet, and the lower end is arranged on one side of the stalk bend and heavy debris outlet; the upper end of the second material guiding and separating plate is connected to the upper end of the third material guiding and separating plate, and the lower end of the second material guiding and separating plate is arranged on the other side of the stalk bend and heavy debris outlet.

[0016] Furthermore, a first adjusting inclined plate, a first adjusting device for adjusting the inclination of the first adjusting inclined plate, and a sensor for detecting the position of the first adjusting inclined plate are also provided at the connection between the first material guiding and separating plate and the stem and heavy debris outlet.

[0017] Furthermore, the upper end of the third material guiding separation plate is connected to the upper end of the second material guiding separation plate, and the lower end is arranged on one side of the tobacco stem outlet; the upper end of the fourth material guiding separation plate is connected to the upper end of the fifth material guiding separation plate, and the lower end is arranged on the other side of the tobacco stem outlet.

[0018] Furthermore, a second adjusting inclined plate, a second adjusting device for adjusting the inclination of the second adjusting inclined plate, and a sensor for detecting the position of the second adjusting inclined plate are also provided at the connection between the third material guiding separation plate and the tobacco stem outlet.

[0019] Furthermore, an air lock is provided at the outlet of the light impurities.

[0020] Furthermore, a first belt conveyor is provided below the outlet of the stem bends and heavy impurities, a second belt conveyor is provided below the outlet of the tobacco stems, and a third belt conveyor is provided below the outlet of the light impurities. Moreover, a first image acquisition device, a second image acquisition device, and a third image acquisition device are respectively provided above the outlet ends of the first belt conveyor, the second belt conveyor, and the third belt conveyor extending out of the sorting box.

[0021] Furthermore, the first air volume adjustment component includes a first air volume adjustment straight plate and a fourth adjustment device for adjusting the opening degree of the first air volume adjustment straight plate; the second air volume adjustment component includes a second air volume adjustment straight plate and a fifth adjustment device for adjusting the opening degree of the second air volume adjustment straight plate.

[0022] The beneficial effects of the present invention are as follows:

[0023] 1. The present invention can solve the problems that the existing tobacco stem impurity removal equipment has a single function and cannot be intelligently adjusted and controlled.

[0024] 2. The box body structure of the present invention is simple, and the maintenance is simple.

[0025] 3. The present invention has the ability of intelligent calculation and control, improving the reaction speed, control accuracy and sorting effect.

[0026] 4. The present invention has the ability of autonomous recognition and automatic adjustment, can automatically recognize different brands, and autonomously adjust and control, improving the intelligent level.

[0027] 5. The present invention has a self-learning function, can autonomously improve and optimize the data model, making the adjustment more accurate and the sorting more accurate. Description of the Drawings

[0028] Figure 1 It is a schematic diagram of the intelligent multi-stage sorting and impurity removal system for tobacco stems of the present invention.

[0029] 1. Feed vibrating trough; 2. Float separation air inlet; 3. Air volume adjusting plate; 4. Third adjusting device; 5. Observation window; 6. First material guiding and separating plate; 7. First adjusting device; 8. First adjusting inclined plate; 9. Stalk bend and heavy impurity outlet; 10. Second material guiding and separating plate; 11. Second adjusting device; 12. Second adjusting inclined plate; 13. Stalk outlet, 14. Observation window; 15. Air lock; 16. Light impurity outlet; 17. Manhole; 18. Observation window; 19. Cyclone dust collector; 20. Air lock; 21. Dust outlet; 22. Air duct; 23. Fan; 24. Adjusting device; 25. Total air volume adjusting valve; 26. Three-stage sorting box; 27. Second air volume adjusting straight plate; 28. Fifth adjusting device; 29. Two-stage sorting box; 30. Fourth adjusting device; 31. First air volume adjusting straight plate; 32. One-stage sorting box; 33. Material inlet; 34. First image acquisition device; 35. First belt conveyor; 36. Second image acquisition device; 37. Second belt conveyor; 38. Third image acquisition device; 39. Third belt conveyor. Detailed implementation manners

[0030] The technical solutions of the present invention will be described in detail below with reference to the accompanying drawings. The following embodiments are merely exemplary and can only be used to explain and illustrate the technical solutions of the present invention, rather than being construed as a limitation to the technical solutions of the present invention.

[0031] As Figure 1 shown, the present invention mainly consists of an intelligent computing control system, a sorting box and a dust removal system; the design and manufacture of the cross-sectional areas of each stage of the three-stage sorting box and the sizes of each air inlet are the key to the present invention.

[0032] The intelligent computing control system consists of an image processing computer, an image acquisition device, an adjusting device and a data model. On the platform of the established data model, with image detection, comparison calculation and control technology as the core, a comparison algorithm is used to intelligently regulate the abnormalities that occur, and it has self-learning and optimization functions.

[0033] The sorting box of the present application consists of three sets of one-stage, two-stage and three-stage sorting boxes connected in series. They are connected end to end. At the same time, the widths and heights of these three-stage sorting boxes are different in the horizontal direction and increase gradually, that is, their cross-sectional areas increase gradually. The cross-sectional area of the three-stage sorting box is larger than that of the two-stage sorting box, and the cross-sectional area of the two-stage sorting box is larger than that of the one-stage sorting box, so that the wind speed of the one-stage sorting box can be greater than that of the two-stage sorting box, and the two-stage is greater than the three-stage.

[0034] One end of the primary sorting box 32 is a feed inlet 33. The discharge port of the feeding vibrating trough 1 is located at the feed inlet 33. Below the outlet of the feeding vibrating trough is the flotation air inlet 2. At the flotation air inlet 2, an air volume regulating plate 3 and a third regulating device 4 are installed to adjust the air intake of the flotation air inlet 2, thereby achieving the best flotation effect. Observation windows 5 are provided on both sides of the primary sorting box 32 to facilitate observing the flight state of the materials in the sorting box and provide guidance for optimizing control parameters.

[0035] Inside the lower part of the primary sorting box, there are two guide and separation plates, namely the first guide and separation plate 6 and the second guide and separation plate 10. The two separation plates have appropriate inclinations. The upper end of the first guide and separation plate 6 is installed at the lower edge of the flotation air inlet 2, and the lower end of the first guide and separation plate 6 is installed on one side of the stem and heavy impurity outlet 9 ( Figure 1 the left side in Figure 1 ), and the lower end of the second guide and separation plate 10 is installed on the other side of the stem and heavy impurity outlet 9 (

[0036] the right side in ). The upper end of the second guide and separation plate 10 is at the outlet of the primary sorting box 32 and is aligned with the first air volume regulating straight plate 31 in the vertical direction and has an appropriate height. At the connection between the first guide and separation plate 6 and the stem and heavy impurity outlet 9, a first regulating inclined plate 8, a first regulating device 7 for adjusting its inclination, and a position sensor for detecting the position of the first regulating inclined plate 8 are installed. Under the instruction of the intelligent control system, the inclination of the first regulating inclined plate 8 can be automatically adjusted and the position data can be fed back to the control system, thereby changing the air intake at the stem and heavy impurity outlet 9 and further changing the flotation effect at this place.

[0036] The inlet of the secondary sorting box 29 is the outlet of the primary sorting box 32, and its structure is similar to that of the primary sorting box 32, except that its width and height are larger than those of the primary sorting box 32. The inlet of the tertiary sorting box 26 is the outlet of the secondary sorting box 29, and its structure is similar, and its width and height are larger than those of the secondary sorting box 29. The guide and separation plate on the right side of the tertiary sorting box 26 is cancelled and replaced with a frame straight plate. At the lightweight impurity outlet 16 at the lower part of the tertiary sorting box 26, an air lock 15 is installed, and no air can enter this place, otherwise the lightweight impurities will not be able to fall and be discharged. A manhole 17 for inspecting and maintaining equipment is installed on the frame straight plate on the right side of the tertiary sorting box 26. At the upper part of the connection between the primary sorting box 32 and the secondary sorting box 29, a first air volume regulating straight plate 31 and a fourth regulating device 30 for adjusting and controlling its opening degree are installed to adjust and control the air volume entering the primary sorting box 32. At the upper part of the connection between the secondary sorting box 29 and the tertiary sorting box 26, a second air volume regulating straight plate 27 and a fifth regulating device 28 for adjusting and controlling its opening degree are installed to adjust and control the total air volume entering the primary sorting box 32 and the secondary sorting box 29. Displacement sensors are installed on the second air volume regulating straight plate 27 and the first air volume regulating straight plate 31 to detect the actual position of the regulating straight plate and upload the position data to the control system.

[0037] The dust removal system consists of a total air volume regulating valve 25, a cyclone dust collector 19, an air lock 20, an air duct 22 and a fan 23. The total air volume regulating valve 25 is a butterfly valve, which is controlled and adjusted by a regulating device 24 and the actual position is fed back. The regulating device 24 is an angle actuator, which is used to control and adjust the total air volume entering the entire sorting box, and is closed when the fan 23 is started to reduce the starting current. Very light debris and dust are discharged through the dust collector 19, the air lock 20, and the dust outlet 21, and fall into the collection box placed at the bottom. The outlet of the fan is connected to the workshop environment dust removal system for further processing and discharge into the atmosphere in compliance with the standards. The fan 23 is controlled by a frequency converter and can adjust the air volume of the entire system.

[0038] Below the outlet 9 for stems and heavy debris, the outlet 13 for tobacco stems, and the outlet 16 for light debris, there are three belt conveyors, namely the first belt conveyor 35, the second belt conveyor 37, and the third belt conveyor 39. The width of these three belt conveyors is slightly larger than the width of the material outlet, and their lengths are larger than the width of the corresponding sorting box (at least larger than 1.5 meters). The specific lengths of these three belt conveyors are determined according to the equipment process discharge. Above the outlets of the first belt conveyor 35, the second belt conveyor 37, and the third belt conveyor 39 extending out of the sorting box, there are three image acquisition devices, namely the first image acquisition device 34, the second image acquisition device 36, and the third image acquisition device 38, which respectively collect data of materials at the three outlets, upload them to the intelligent control system, and compare them with the data stored in the system, and then adjust and control the corresponding adjustment device, which can change the air volume of the adjustment device, thereby achieving the purpose of accurate and intelligent sorting of materials.

[0039] Working principle:

[0040] Since the cross-sectional area of ​​the first-stage sorting box is smaller than that of the second-stage sorting box, and the cross-sectional area of ​​the second-stage sorting box is smaller than that of the third-stage sorting box, and at the same time, under the adjustment of the air volume adjustment device, the wind speed in the first-stage sorting box can be greater than the wind speed in the second-stage sorting box, and similarly, the wind speed in the second-stage sorting box can be greater than the wind speed in the third-stage sorting box.

[0041] When it is necessary to start working, the total air volume regulating valve 25 is closed, and the fan 23 starts under the control of the frequency converter. When the appropriate rotational speed is reached, the total air volume regulating valve 25 is opened to an appropriate angle. The fan 23 and the total air volume regulating valve 25 coordinate with each other to jointly regulate the total air volume entering the sorting and impurity removal system. The second air volume regulating straight plate 27 moves up and down along the guide rail to an appropriate position under the control of the fifth regulating device 28, and can regulate the total air volume passing through the first-stage and second-stage sorting boxes. The first air volume regulating straight plate 31 moves up and down along the guide rail to an appropriate position under the control of the fourth regulating device 30, and can regulate the total air volume of the first-stage sorting box 32; under the control and regulation of the third regulating device 4 and the first regulating device 7, the inclination angles of the air volume regulating plate 3 and the first inclined plate 8 can be changed respectively, thereby changing the air volume at the floating selection air inlet 2 and the stalk twist and heavy impurity outlet 9, and also changing the wind speeds at these two places, and the required floating selection and flotation effects can be produced. Under the control and regulation of the second regulating device 11, the inclination angle of the second inclined plate 12 can be changed, thereby changing the air volume at the tobacco stalk outlet 13, and also changing the wind speeds at the second inclined plate 12 and the tobacco stalk outlet 13, and the required floating selection and flotation effects can be produced.

[0042] The tobacco stalks are sent into the first-stage sorting box 32 in the multi-stage sorting and impurity removal system by the feeding vibrating trough 1. First, they are subjected to floating selection under the action of lateral air inlet at the air inlet 2. Since the densities and windward areas of the materials to be separated are different, the falling distances of the materials to be sorted under the action of the lateral wind are also different. Therefore, the wind speed of the lateral air inlet can be reasonably adjusted to perform floating selection on the materials to be sorted. In order to ensure the sorting effect, the materials falling after floating selection are vertically air inlet again at the stalk twist and heavy impurity outlet 9 for flotation. Under the combined action of floating selection and flotation, heavy impurities (such as metal objects and stones) and stalk twists fall and are discharged through the stalk twist and heavy impurity outlet 9. Normal tobacco stalks and light impurities enter the second-stage sorting box through the air outlet at the first air volume regulating straight plate 31 and are sorted again.

[0043] Since the cross-sectional area of the second-stage sorting box 29 is larger than that of the first-stage sorting box 32, the wind speed in the second-stage sorting box is less than that in the first-stage sorting box, and the tobacco stalks can fall; when the tobacco stalks enter the second-stage sorting box 29, they are also first subjected to floating selection, and then the materials falling after floating selection are vertically air inlet again at the tobacco stalk outlet 13 for flotation. Under the combined action of floating selection and flotation, normal tobacco stalks fall and are discharged through the tobacco stalk outlet 13. Light impurities (such as paper scraps, hemp ropes, and dust) enter the third-stage sorting box 26 through the air outlet at the second air volume regulating straight plate 27 and are sorted again.

[0044] When light impurities enter the three - stage separation box 26 with the air flow, since the cross - sectional area of the three - stage separation box 26 is larger than that of the two - stage separation box 29, the wind speed in the three - stage separation box is less than that in the two - stage separation box. As long as an appropriate wind speed is maintained in the three - stage separation box, the light impurities will fall and be discharged through the air lock 15 and the light impurity outlet 16. During the whole process, except for dust, no materials are carried out of the multi - stage separation box by the air flow, thus achieving the purpose of on - site separation.

[0045] Dust enters the cyclone dust collector 19 with the air flow, is discharged through the air lock 20 and the dust outlet 21, and falls into the collection box. The air flow then enters the workshop centralized dust removal system through the fan 23.

[0046] Heavy impurities and stalk crutches fall from the stalk crutch and heavy impurity outlet 9 onto the first belt conveyor 35 below, and are detected by the first image acquisition device 34 installed above the first belt conveyor 35. The first image acquisition device 34 uploads the detected data to the intelligent control platform. The platform, through comparative calculations based on the data model, issues instructions to adjust the positions of the air volume adjustment plate 3, the first adjustment inclined plate 8, and the first air volume adjustment straight plate 31, changing the wind speed and the flotation and floating separation effects in the first - stage separation box, so that only heavy impurities and stalk crutches fall and are discharged through the stalk crutch and heavy impurity outlet 9, while normal tobacco stalks and light impurities enter the second - stage separation box for re - separation. By the same token, tobacco stalks fall from the tobacco stalk outlet 13 onto the second belt conveyor 37 below, and are detected by the second image acquisition device 36 installed above the second belt conveyor 37. The second image acquisition device 36 uploads the detected data to the intelligent control platform. The platform, through comparative calculations based on the data model, issues instructions to adjust the positions of the second adjustment inclined plate 12 and the second air volume adjustment straight plate 27, so that only normal tobacco stalks fall and are discharged through the tobacco stalk outlet 13, while light impurities enter the three - stage separation box. By the same token, light impurities fall from the light impurity outlet 16 onto the third belt conveyor 39 below, and are detected by the third image acquisition device 38 installed above the third belt conveyor 39. The third image acquisition device 38 uploads the detected data to the intelligent control platform. The platform, through comparative calculations based on the data model, issues instructions to adjust the position of the total air volume adjustment valve 25, ensuring that no normal tobacco stalks can appear in the light impurities, and only light impurities fall and are discharged through the air lock 15 and the light impurity outlet 16.

[0047] Under the control and adjustment of the intelligent control system, the total air volume and the air volume and wind speed at each location are intelligently adjusted to ensure that only heavy impurities and stalk crutches can be on the first belt conveyor 35, and no normal tobacco stalks can appear; only normal tobacco stalks can be on the second belt conveyor 37, and no heavy, light impurities, and stalk crutches can appear; only light impurities can be on the third belt conveyor 39, and no normal tobacco stalks can be present.

[0048] Although embodiments of the present invention have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. An intelligent multi-stage sorting and impurity removal system for tobacco stems, characterized in that, It includes three sorting bins connected in series, and the widths and heights of the three sorting bins increase successively in the horizontal direction; The discharge port of the feeding vibrating chute is located at the feeding port of the first sorting bin, and an air inlet assembly is arranged below the discharge port of the feeding vibrating chute; A first guide and separation plate and a second guide and separation plate are arranged at the lower part inside the first sorting bin. Both the first guide and separation plate and the second guide and separation plate are inclined from the stem bend and heavy foreign matter outlet to both sides; A third guide and separation plate and a fourth guide and separation plate are arranged at the lower part inside the second sorting bin. Both the third guide and separation plate and the fourth guide and separation plate are inclined from the tobacco stem outlet to both sides; A fifth guide and separation plate is arranged at the lower part inside the third sorting bin. The fifth guide and separation plate is inclined from one side of the light foreign matter outlet; A first air volume regulating assembly is arranged above the connection between the first sorting bin and the second sorting bin, and a second air volume regulating assembly is arranged above the connection between the second sorting bin and the third sorting bin; The side upper part of the third sorting bin is connected to the dust removal system through a pipeline.

2. The intelligent multi-stage sorting and impurity removal system for tobacco stems according to claim 1, wherein The air inlet assembly includes a winnowing air inlet, and an air volume regulating plate and a third regulating device are arranged at the winnowing air inlet.

3. The intelligent multi-stage sorting and impurity removal system for tobacco stems according to claim 1, characterized in that, Observation windows are arranged on both sides of the first sorting bin, the second sorting bin and the third sorting bin.

4. The intelligent multi-stage sorting and impurity removal system for tobacco stems according to claim 1, characterized in that, The upper end of the first guide and separation plate is arranged at the lower edge of the winnowing air inlet, and the lower end is arranged at one side of the stem bend and heavy foreign matter outlet; the upper end of the second guide and separation plate is connected to the upper end of the third guide and separation plate, and the lower end of the second guide and separation plate is arranged at the other side of the stem bend and heavy foreign matter outlet.

5. The intelligent multi-stage sorting and impurity removal system for tobacco stems according to claim 1, wherein, A first adjusting inclined plate, a first adjusting device for adjusting the inclination of the first adjusting inclined plate and a sensor for detecting the position of the first adjusting inclined plate are also arranged at the connection between the first guide and separation plate and the stem bend and heavy foreign matter outlet.

6. The intelligent multi-stage sorting and impurity removal system for tobacco stems according to claim 1, wherein The upper end of the third guide and separation plate is connected to the upper end of the second guide and separation plate, and the lower end is arranged at one side of the tobacco stem outlet; the upper end of the fourth guide and separation plate is connected to the upper end of the fifth guide and separation plate, and the lower end is arranged at the other side of the tobacco stem outlet.

7. The intelligent multi-stage sorting and impurity removal system for tobacco stems according to claim 6, characterized in that, A second adjusting inclined plate, a second adjusting device for adjusting the inclination of the second adjusting inclined plate and a sensor for detecting the position of the second adjusting inclined plate are also arranged at the connection between the third guide and separation plate and the tobacco stem outlet.

8. The intelligent multi-stage sorting and impurity removal system for tobacco stems according to claim 1, wherein An air lock is arranged at the light foreign matter outlet.

9. The intelligent multi-stage sorting and impurity removal system for tobacco stems according to claim 1, wherein A first belt conveyor is arranged below the stem bend and heavy foreign matter outlet, a second belt conveyor is arranged below the tobacco stem outlet, and a third belt conveyor is arranged below the light foreign matter outlet. And above the outlet ends of the first belt conveyor, the second belt conveyor and the third belt conveyor extending out of the sorting bin, a first image acquisition device, a second image acquisition device and a third image acquisition device are respectively arranged.

10. The intelligent multi-stage sorting and impurity removal system for tobacco stems according to claim 1, wherein, The first air volume regulating assembly includes a first air volume regulating straight plate and a fourth regulating device for adjusting the opening degree of the first air volume regulating straight plate; the second air volume regulating assembly includes a second air volume regulating straight plate and a fifth regulating device for adjusting the opening degree of the second air volume regulating straight plate.

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