Photoelectric tobacco stem sorting device

Abstract

The utility model relates to a photoelectric tobacco stem sorting device, which relates to the technical field of tobacco processing equipment, and comprises a blanking barrel, a vibration material distribution assembly and two groups of photoelectric sorting assemblies, and tobacco stems flowing out of a discharge port of the blanking barrel are conveyed to the upstream photoelectric sorting assembly through a first conveying belt; the upstream photoelectric sorting assembly divides the tobacco stems into qualified stems and mixed stems, the mixed stems sorted by the upstream photoelectric sorting assembly are conveyed to the downstream photoelectric sorting assembly through a second conveying belt, and the downstream photoelectric sorting assembly divides the mixed stems into qualified stems and unqualified stems; the vibration material distribution assembly is connected with the material falling barrel through a buffering piece, tobacco stems falling in the material falling barrel flow through the vibration material distribution assembly, the vibration material distribution assembly vibrates the tobacco stems, and the rotating speed of the first conveying belt is larger than the speed of the tobacco stems flowing out of a discharging port of the material falling barrel. The tobacco stem sorting equipment has the effects that vibration cannot directly act on the main equipment, so that fatigue damage of the vibration to the main equipment is weakened, and the overall reliability of the tobacco stem sorting equipment is improved.

Description

Technical Field

[0001] This application relates to the field of tobacco processing equipment technology, and in particular to a photoelectric tobacco stem sorting device. Background Technology

[0002] Tobacco stems are the stalks of tobacco leaves during tobacco processing, accounting for approximately 25%-30% of the tobacco leaf weight. They are mainly composed of cellulose and some residual nicotine and have a lignified structure. During tobacco processing, in order to separate tobacco stems that are too thick (>3mm) or too thin (<0.5mm) and ensure the uniformity of the shredded tobacco, tobacco stem sorting is necessary. Therefore, tobacco stem sorting is a key step in ensuring product quality.

[0003] The utility model patent with publication number CN205165209U discloses a device for removing tobacco stems from tobacco stems based on machine vision. In this patent, the tobacco stems are evenly spread across the width of the trough by a vibrating conveyor, and are also initially spread along the length of the trough, approaching a single-layer state. However, when the tobacco stems are spread by the vibrating conveyor, the vibration directly acts on the main equipment (bearings, motor), making the main equipment prone to fatigue damage, which reduces the overall reliability of the tobacco stem sorting equipment. Utility Model Content

[0004] To address the issue of vibration directly affecting the main equipment, which can easily cause fatigue damage and reduce the reliability of the tobacco stem sorting equipment, this application provides a photoelectric tobacco stem sorting device.

[0005] The photoelectric tobacco stem sorting device provided in this application adopts the following technical solution:

[0006] A photoelectric tobacco stem sorting device includes a feeding cylinder, a vibrating cloth assembly, and two sets of photoelectric sorting assemblies arranged upstream and downstream. The tobacco stems flowing out of the discharge port of the feeding cylinder are conveyed to the inlet of the upstream photoelectric sorting assembly via a first conveyor belt. The upstream photoelectric sorting assembly can separate the tobacco stems into qualified stems and mixed stems. The mixed stems sorted by the upstream photoelectric sorting assembly are conveyed to the downstream photoelectric sorting assembly via a second conveyor belt. The downstream photoelectric sorting assembly can separate the mixed stems into qualified stems and unqualified stems.

[0007] The vibrating fabric assembly is mounted on the discharge cylinder and connected to the discharge cylinder via a buffer. The tobacco stems falling in the discharge cylinder flow through the vibrating fabric assembly, which can vibrate the tobacco stems. The rotation speed of the first conveyor belt is greater than the speed at which the tobacco stems flow out of the discharge port of the discharge cylinder, so that the tobacco stems are arranged in a single layer on the first conveyor belt.

[0008] By adopting the above technical solution, during the tobacco stem sorting process, the tobacco stems enter the feed hopper. As the feed hopper falls, the tobacco stems flow through the vibrating cloth assembly, which vibrates the tobacco stems, causing any clumps to disperse. The tobacco stems then flow out from the outlet onto the first conveyor belt, which transports them to the upstream photoelectric sorting assembly. The upstream photoelectric sorting assembly separates qualified stems from mixed stems. The separated mixed stems are then transported by the second conveyor belt to the downstream photoelectric sorting assembly, which separates the mixed stems into qualified and unqualified stems, thus completing the tobacco stem sorting. By placing the vibrating cloth assembly on the feed hopper and connecting it to the feed hopper through a buffer assembly, the vibration cannot directly act on the main equipment, thereby reducing fatigue damage to the main equipment and improving the overall reliability of the tobacco stem sorting equipment.

[0009] Preferably, the vibrating fabric assembly includes a vibration generating device and a fabric plate. The vibration generating device is disposed on the feeding cylinder and connected to the fabric plate so as to drive the fabric plate to vibrate. The fabric plate is located on the flow path of the tobacco stems in the feeding cylinder.

[0010] By adopting the above technical solution, the vibration generator drives the cloth plate to vibrate, which vibrates the tobacco stems on the flow path inside the discharge cylinder. This effectively disperses the gathered tobacco stems, making it easier for the tobacco stems to be sorted into a single layer on the first conveyor belt, thus creating conditions for more precise and efficient tobacco stem sorting.

[0011] Preferably, there are two sets of vibrating cloth assemblies, with two cloth plates respectively disposed on the opposite inner sidewalls of the discharge cylinder. The two cloth plates are spaced apart vertically, and the tobacco stems can flow through the two cloth plates to the discharge port of the discharge cylinder.

[0012] By adopting the above technical solution, the two sets of vibrating cloth components, which are spaced apart vertically and respectively set on the inner sidewalls of the feeding cylinder, can more fully vibrate the falling tobacco stems, further disperse the tobacco stems, improve the degree of single-layer separation of tobacco stems on the first conveyor belt, and thus improve the accuracy and efficiency of tobacco stem sorting by the subsequent photoelectric sorting components.

[0013] Preferably, except for the discharge edge, the other edges of the fabric plate are connected to the side wall of the discharge cylinder by an elastic cloth.

[0014] By adopting the above technical solution, the elastic part seals the gap between the cloth plate and the inner wall of the discharge cylinder, preventing the leakage of tobacco stems and not hindering the vibration of the cloth plate. This ensures the vibration dispersion effect of the vibrating cloth assembly on the tobacco stems, while also reducing the impact of the tobacco stems on the side wall of the discharge cylinder, thus reducing noise and equipment wear.

[0015] Preferably, an arc-shaped channel is formed at the bottom of the discharge cylinder, and the end of the arc-shaped channel forms the discharge port of the discharge cylinder, such that the angle α between the velocity direction F1 of the tobacco stem flowing out of the discharge port of the discharge cylinder and the moving direction F2 of the first conveyor belt is ≤30°.

[0016] By adopting the above technical solution, the angle between the velocity direction of the tobacco stems flowing out of the discharge port of the discharge cylinder and the moving direction of the first conveyor belt is smaller, which allows the tobacco stems to transition more smoothly onto the first conveyor belt, effectively avoiding the accumulation of tobacco stems at the junction and improving the stability of the tobacco stems during the conveying process.

[0017] Preferably, the photoelectric sorting component includes an image acquisition device, an image processing system, a sorting valve, and a separation cylinder. The separation cylinder has a first channel and a second channel. Both the first conveyor belt and the second conveyor belt can throw tobacco stems toward the separation cylinder in a parabolic shape. The image acquisition device can acquire images of the thrown tobacco stems and transmit the image signals to the image processing system. The image processing system processes the image signals and controls the opening and closing of the sorting valve. The sorting valve can push mixed stems and unqualified stems into the first channel, qualified stems enter the second channel along a parabola, and mixed stems fall onto the second conveyor belt along the first channel.

[0018] By adopting the above technical solution, the image acquisition device collects images of the thrown tobacco stems, and the image processing system processes the image signals to control the opening and closing of the sorting valve. This enables automated and precise sorting of qualified stems, mixed stems, and unqualified stems, improving sorting efficiency and accuracy. Furthermore, the sorted tobacco stems are transported through predetermined channels to ensure the orderly progress of subsequent processing.

[0019] Preferably, a qualified conveyor belt mechanism is provided below each of the second channels, and a non-qualified conveyor belt mechanism is provided below the first channel located downstream.

[0020] By adopting the above technical solution, it is easier to collect and transport the sorted qualified and unqualified stems, thereby improving the continuity and efficiency of the tobacco stem sorting work.

[0021] Preferably, the frame is provided with a transparent plate opposite to the image acquisition device, the image acquisition device can collect images of the tobacco stem through the transparent plate, and the frame is provided with an air blowing mechanism that can blow air towards the side of the tobacco stem through the transparent plate.

[0022] By adopting the above technical solution, the air blowing mechanism blows air towards the side of the transparent plate towards the tobacco stem, which can prevent tobacco stem debris and other impurities from adhering to the transparent plate, ensuring the clarity of the image acquisition device when collecting images of the tobacco stem through the transparent plate, thereby improving the accuracy of tobacco stem sorting.

[0023] Preferably, the frame is equipped with a lighting device at the image acquisition device.

[0024] By adopting the above technical solution, setting up a lighting device at the image acquisition device can provide sufficient light for the image acquisition device, enabling the image acquisition device to acquire images of tobacco stems more clearly and accurately, thereby improving the accuracy of the subsequent image processing system in sorting and judging tobacco stems and enhancing the sorting precision of the tobacco stem sorting device.

[0025] In summary, this application includes at least one of the following beneficial technical effects:

[0026] 1. The vibrating cloth assembly is connected to the feed cylinder through a buffer to prevent vibration from acting directly on the main equipment, reduce fatigue damage to the main equipment, and improve the overall reliability of the tobacco stem sorting equipment;

[0027] 2. By using two sets of photoelectric sorting components set up upstream and downstream, multi-level sorting of tobacco stems is achieved, improving the accuracy and efficiency of tobacco stem sorting;

[0028] 3. The vibration generator vibrates the cloth plate, which disperses the accumulated tobacco stems. The tobacco stems move along the discharge port of the discharge cylinder to the first conveyor belt. The moving speed of the first conveyor belt is greater than the speed at which the tobacco stems flow out of the discharge port, thereby realizing the single-layer of tobacco stems on the first conveyor belt, which is beneficial for subsequent photoelectric sorting. Attached Figure Description

[0029] Figure 1 This is a schematic diagram of the photoelectric tobacco stem sorting device according to an embodiment of this application.

[0030] Figure 2 This is a top view showing the electric tobacco stem sorting device.

[0031] Figure 3 It is along Figure 2 A cross-sectional view along line AA in the middle.

[0032] Figure 4 It is along Figure 2 A cross-sectional view along the BB line.

[0033] Explanation of reference numerals in the attached drawings: 1. Feeding cylinder; 11. Arc-shaped channel; 2. Vibrating fabric assembly; 21. Vibration generating device; 211. Electromagnetic vibrator; 22. Fabric plate; 23. Support plate; 24. Elastic fabric; 3. Photoelectric sorting assembly; 31. Image acquisition device; 311. Industrial camera; 32. Image processing system; 321. Central processing unit; 33. Sorting valve; 331. Nozzle; 332. Solenoid valve; 34. Separating cylinder; 341. First channel; 342. Second channel; 35. Qualified conveyor belt mechanism; 36. Unqualified conveyor belt mechanism; 37. Lighting device; 38. Transparent plate; 39. Air blowing mechanism; 391. Fan; 392. Air blowing pipe; 4. Frame; 5. Buffer; 51. Telescopic spring; 52. Spring layer; 61. First conveyor belt; 62. Second conveyor belt. Detailed Implementation

[0034] The following will be combined with the appendix Figures 1-4 The technical solutions in the embodiments of this utility model are described in further detail below. The described embodiments are only possible technical implementations of this utility model, but are not limited thereto. Other embodiments obtained by those skilled in the art in conjunction with the embodiments of this utility model without creative effort are also within the protection scope of this utility model.

[0035] This application mainly adopts a scheme that combines vibrating cloth with multi-stage photoelectric sorting, which achieves the effect of reducing the fatigue damage of vibration to the main equipment and improving the overall reliability of the tobacco stem sorting equipment. The following is a further detailed description of this application.

[0036] Reference Figure 1A photoelectric tobacco stem sorting device includes a feeding cylinder 1, a vibrating cloth assembly 2, and two sets of photoelectric sorting assemblies 3 arranged upstream and downstream. The feeding cylinder 1 is fixedly mounted vertically on a frame 4. The top of the feeding cylinder 1 is flared, and the tobacco stems enter the feeding cylinder 1 through the top opening, providing a flow channel for the tobacco stems. There are two sets of vibrating cloth assemblies 2, which are respectively arranged on opposite side walls of the feeding cylinder 1. Each set of vibrating cloth assemblies 2 is connected to the feeding cylinder 1 through a buffer 5. The tobacco stems entering through the top opening of the feeding cylinder 1 pass through the two vibrating cloth assemblies 2 and then flow out through the discharge port at the bottom of the feeding cylinder 1. The bottom outlet of the feeding cylinder 1 is connected to the upstream photoelectric sorting component 3 via a first conveyor belt 61. The frame 4 is equipped with conveyor rollers and a motor that cooperate with the first conveyor belt 61, enabling the first conveyor belt 61 to move the tobacco stems. The speed at which the tobacco stems flow out of the outlet of the feeding cylinder 1 is less than the rotational speed of the first conveyor belt 61. The width of the main body of the feeding cylinder 1 is the same as the width of the first conveyor belt 61, allowing for a larger area of ​​single-layer tobacco stems laid flat on the first conveyor belt 61. Furthermore, the frame 4 is equipped with side guards on both sides of the first conveyor belt 61 to effectively prevent tobacco stems from falling off during the conveying process.

[0037] The first conveyor belt 61 transports tobacco stems to the upstream photoelectric sorting component 3. The upstream photoelectric sorting component 3 separates the tobacco stems into qualified stems and mixed stems containing both qualified and unqualified stems. The upstream and downstream photoelectric sorting components 3 are connected by a second conveyor belt 62. The frame 4 is equipped with a motor and conveyor rollers that cooperate with the second conveyor belt 62, enabling the second conveyor belt 62 to move the tobacco stems. Similarly, the frame 4 has side rails on both sides of the second conveyor belt 62 to prevent tobacco stems from falling off. The mixed stems sorted by the upstream photoelectric sorting component 3 fall onto the second conveyor belt 62, which then transports them to the downstream photoelectric sorting component 3. The downstream photoelectric sorting component 3 separates the mixed stems into qualified and unqualified stems for separate discharge, thus completing the tobacco stem sorting process.

[0038] The vibrating cloth assembly 2 vibrates the tobacco stems falling into the feed cylinder 1. Combined with the buffer 5, this prevents the vibration from directly impacting the main equipment, reducing fatigue damage. Furthermore, the rotational speed of the first conveyor belt 61 is greater than the speed at which the tobacco stems flow out of the discharge port, allowing for better single-layer arrangement of the tobacco stems on the first conveyor belt 61. This facilitates efficient and precise sorting of the tobacco stems by the subsequent two sets of photoelectric sorting assemblies 3, improving sorting efficiency and quality. Through the two sets of photoelectric sorting assemblies 3 installed upstream and downstream, multi-stage sorting of tobacco stems is achieved, improving the accuracy and efficiency of tobacco stem sorting.

[0039] Reference Figure 2 , Figure 3Each vibrating fabric assembly 2 includes a vibration generating device 21 and a fabric plate 22. The vibration generating device 21 is an electromagnetic vibrator 211. A support plate 23 is fixedly provided on the side wall of the material drop cylinder 1. The vibration generating device 21 and the support plate 23 are connected by a buffer 5. In this embodiment, the buffer 5 is a spring layer 52 composed of multiple telescopic springs 51. In other embodiments, the buffer 5 can also be an elastic buffer pad. Both ends of each telescopic spring 51 are fixedly connected to the housing of the electromagnetic vibrator 211 and the support plate 23, respectively, to reduce the transmission of vibration from the electromagnetic vibrator 211 to the material drop cylinder 1. The output shaft of the electromagnetic vibrator 211 passes through the cylinder wall of the material drop cylinder 1 and extends into the material drop cylinder 1. The diameter of the through hole opened on the material drop cylinder 1 for the output shaft of the electromagnetic vibrator 211 to pass through is larger than the diameter of the output shaft of the electromagnetic vibrator 211, reducing the vibration impact on the material drop cylinder 1. The cloth plate 22 is fixedly installed at one end of the output shaft of the electromagnetic vibrator 211 inserted into the feeding cylinder 1. Each cloth plate 22 corresponds to one inner side wall of the feeding cylinder 1. The two cloth plates 22 are arranged vertically and vertically, and the two cloth plates 22 are arranged at an angle to each other and downwards, so that the tobacco stems flow through one cloth plate 22 and then through the other cloth plate 22. The angle between each cloth plate 22 and the horizontal plane is 20°, and the projections of the two cloth plates 22 on the horizontal plane have an overlapping part.

[0040] Reference Figure 2 , Figure 3 The tobacco stems flow out along the bottom edge of the cloth plate 22, hence the bottom edge of the cloth plate 22 is called the discharge edge. There is a gap between the cloth plate 22 and the inner wall of the discharge cylinder 1. Except for the discharge edge, the other three edges of the cloth plate 22 are connected to the discharge cylinder 1 by elastic cloth 24, which seals the gap between the discharge cylinder 1 and the cloth plate 22 and prevents the cloth plate 22 from contacting the discharge cylinder 1, thus preventing tobacco stem leakage. It also does not hinder the vibration of the cloth plate 22, ensuring the vibration dispersion effect of the vibrating cloth assembly 2 on the tobacco stems. At the same time, it can also reduce the impact of the tobacco stems on the side wall of the discharge cylinder 1, reducing noise and equipment wear.

[0041] As the tobacco stems fall along the feed cylinder 1, they pass through two vibrating cloth plates 22 in sequence. The vibration generator 21 drives the cloth plates 22 to vibrate, which vibrates the tobacco stems on the flow path inside the feed cylinder 1. This effectively disperses the gathered tobacco stems, making it easier for the tobacco stems to be sorted into a single layer on the first conveyor belt 61, thus creating conditions for more precise and efficient tobacco stem sorting.

[0042] Reference Figure 2 , Figure 3The bottom of the feeding cylinder 1 gradually tapers from top to bottom and gradually bends towards the horizontal to form an arc-shaped structure, and an arc-shaped channel 11 is formed within the arc-shaped structure. The end of the feeding cylinder 1 forms the discharge port of the feeding cylinder 1. When the tobacco stems flow out along the discharge port of the feeding cylinder 1, the angle α between the velocity direction F1 of the tobacco stems and the moving direction F2 of the first conveyor belt 61 is ≤30°. In this embodiment, α=30° is preferred. The angle between the velocity direction of the tobacco stems flowing out of the discharge port of the feeding cylinder 1 and the moving direction of the first conveyor belt 61 is small, which allows the tobacco stems to transition more smoothly onto the first conveyor belt 61, reduces the accumulation of tobacco stems at the junction, improves the stability of the tobacco stems during the conveying process, and at the same time allows the tobacco stems that fall onto the first conveyor belt 61 to be removed by the first conveyor belt 61 in time, so that the tobacco stems are arranged in a single layer on the first conveyor belt 61.

[0043] Reference Figure 2 , Figure 4 The upstream photoelectric sorting component 3 and the downstream photoelectric sorting component 3 have the same structure and use the same method to sort qualified and unqualified tobacco stems. This embodiment takes the upstream photoelectric sorting component 3 as an example. The photoelectric sorting component 3 in this embodiment includes an image acquisition device 31, an image processing system 32, a sorting valve 33, and a separating cylinder 34. The bottom of the separating cylinder 34 is bifurcated to form a first channel 341 and a second channel 342. The bottom opening of the first channel 341 extends above the second conveyor belt 62, and the bottom of the second channel 342 is equipped with a qualified conveyor belt mechanism 35. The first conveyor belt 61 drives the tobacco stems to be thrown parabolically towards the second channel 342. The image acquisition device 31 is an industrial camera 311, which is positioned above the thrown tobacco stems and facing them to acquire images of the tobacco stems. The sorting valve 33 is fixedly mounted on the frame 4 and located behind the industrial camera 311. The sorting valve 33 includes multiple nozzles 331 and solenoid valves 332. The nozzles 331 are spaced apart along the width of the first conveyor belt 61, positioned above the projected tobacco stems and facing the first channel 341. Each solenoid valve 332 corresponds to one nozzle 331. The outlet of the solenoid valve 332 is connected to the nozzle 331, and the other end is connected to a pressure tank. The solenoid valves 332 are connected to an image processing system, which controls the opening and closing of each solenoid valve 332. In this embodiment, the image processing system 32 is a central processing unit 321.

[0044] Tobacco stems are discretized and projected via a high-speed projectile belt. An industrial camera 311 (2000fps, infrared + ring light source) acquires images in real time and transmits them to a central processing unit 321 (Intel i7 + NI cRIO). After defect analysis based on width, length, and color characteristics, the FPGA triggers an array of solenoid valves 332 (response ≤2ms) to precisely control high-pressure nozzles (0.4-0.8MPa) to blow unqualified tobacco stems into the first channel 341. Qualified stems fall into the second channel 342 by inertia. The human-machine interface monitors sorting efficiency and quality parameters in real time, realizing closed-loop control of the entire process.

[0045] During the sorting of tobacco stems, the stems are thrown towards the second channel 342 via a conveyor belt. An industrial camera 311 samples and analyzes the thrown stems, then transmits the signal to a central processing unit 321. The central processing unit 321 compares the stems against set indicators to determine if they are qualified. It then outputs a control signal to the solenoid valve 332 on the nozzle 331 of the corresponding stem. The solenoid valve 332 opens, blowing unqualified stems into the first channel 341, while qualified stems are thrown into the second channel 342. An image acquisition device 31 captures images of the thrown stems, and an image processing system 32 processes the image signals to control the opening and closing of the sorting valve 33. This enables automated and precise sorting of qualified, mixed, and unqualified stems, improving sorting efficiency and accuracy. Furthermore, the sorted stems are transported along predetermined channels to ensure the orderly progress of subsequent processing.

[0046] Reference Figure 2 , Figure 4 The frame 4 is equipped with a lighting device 37 in front of the industrial camera 311. In this embodiment, the lighting device 37 is a light strip. Setting a light strip at the industrial camera 311 can provide sufficient light for the image acquisition device 31, so that the image acquisition device 31 can more clearly and accurately acquire images of tobacco stems, thereby improving the accuracy of the subsequent image processing system 32 in sorting tobacco stems and improving the sorting accuracy of the tobacco stem sorting device.

[0047] Reference Figure 2 , Figure 4 A transparent plate 38 is installed below the industrial camera 311 in the frame 4. In this embodiment, the transparent plate 38 is a glass plate that blocks the camera lens of the industrial camera 311. The frame 4 is equipped with an air blowing mechanism 39, which is a fan 391. The frame 4 is also equipped with an air blowing pipe 392, which has a through hole for blowing air towards the bottom wall of the transparent plate 38. The fan 391 is connected to the air blowing pipe 392 through a pipe. By using the air blowing mechanism 39 to blow air towards the side of the transparent plate 38 towards the tobacco stems, it is possible to prevent tobacco stem fragments and other impurities from adhering to the transparent plate 38, ensuring the clarity of the image acquisition device 31 when collecting images of the tobacco stems through the transparent plate 38, thereby improving the accuracy of tobacco stem sorting.

[0048] Reference Figure 1 The downstream separation cylinder 34 has a defective conveyor belt mechanism 36 below the first channel 341 and a qualified conveyor belt mechanism 35 below the second channel 342 to transport the sorted qualified and defective stems, thereby improving the continuity and efficiency of the tobacco stem sorting work.

[0049] The implementation principle of the photoelectric tobacco stem sorting device in this application embodiment is as follows: the vibrating cloth assembly 2 vibrates the tobacco stems falling into the discharge cylinder 1. Combined with the spring layer 52, this prevents the vibration from directly acting on the main equipment, reducing fatigue damage. Furthermore, the rotation speed of the first conveyor belt 61 is greater than the speed at which the tobacco stems flow out of the discharge port, allowing the tobacco stems to be better arranged in a single layer on the first conveyor belt 61. This facilitates efficient and precise sorting of the tobacco stems by the subsequent two sets of photoelectric sorting assemblies 3, improving the sorting efficiency and quality. Through the two sets of photoelectric sorting assemblies 3 set upstream and downstream, multi-stage sorting of tobacco stems is achieved, improving the accuracy and efficiency of tobacco stem sorting.

[0050] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A photoelectric tobacco stem sorting device, characterized in that: The assembly includes a feeding cylinder (1), a vibrating cloth assembly (2), and two sets of photoelectric sorting assemblies (3) set at the upstream and downstream ends. The tobacco stems flowing out of the outlet of the feeding cylinder (1) are conveyed to the inlet of the upstream photoelectric sorting assembly (3) by the first conveyor belt (61). The upstream photoelectric sorting assembly (3) can separate the tobacco stems into qualified stems and mixed stems. The mixed stems sorted by the upstream photoelectric sorting assembly (3) are conveyed to the downstream photoelectric sorting assembly (3) by the second conveyor belt (62). The downstream photoelectric sorting assembly (3) can separate the mixed stems into qualified stems and unqualified stems. The vibrating fabric assembly (2) is disposed on the dropping cylinder (1) and connected to the dropping cylinder (1) through a buffer (5). The tobacco stems falling in the dropping cylinder (1) flow through the vibrating fabric assembly (2). The vibrating fabric assembly (2) can vibrate the tobacco stems. The rotation speed of the first conveyor belt (61) is greater than the speed at which the tobacco stems flow out of the discharge port of the dropping cylinder (1) so that the tobacco stems can be single-layered on the first conveyor belt (61).

2. The photoelectric tobacco stem sorting device according to claim 1, characterized in that: The vibrating fabric assembly (2) includes a vibration generating device (21) and a fabric plate (22). The vibration generating device (21) is disposed on the material drop cylinder (1) and connected to the fabric plate (22) so as to drive the fabric plate (22) to vibrate. The fabric plate (22) is located on the flow path of the tobacco stem in the material drop cylinder (1).

3. The photoelectric tobacco stem sorting device according to claim 2, characterized in that: The number of the vibrating cloth assembly (2) is two sets. The two cloth plates (22) are respectively set on the inner sidewalls opposite to the discharge cylinder (1). The two cloth plates (22) are set at intervals above and below, and the tobacco stems can flow through the two cloth plates (22) to the discharge port of the discharge cylinder (1).

4. The photoelectric tobacco stem sorting device according to claim 2, characterized in that: Except for the discharge edge, the other edges of the fabric plate (22) are connected to the side wall of the discharge cylinder (1) by an elastic cloth (24).

5. The photoelectric tobacco stem sorting device according to claim 1, characterized in that: The bottom of the discharge cylinder (1) forms an arc-shaped channel (11), and the end of the arc-shaped channel (11) forms the discharge port of the discharge cylinder (1), such that the angle α between the velocity direction F1 of the tobacco stem flowing out of the discharge port of the discharge cylinder (1) and the moving direction F2 of the first conveyor belt (61) is ≤30°.

6. The photoelectric tobacco stem sorting device according to claim 1, characterized in that: The photoelectric sorting component (3) includes an image acquisition device (31), an image processing system (32), a sorting valve (33), and a separation cylinder (34). The separation cylinder (34) is provided with a first channel (341) and a second channel (342). Both the first conveyor belt (61) and the second conveyor belt (62) can throw tobacco stems toward the separation cylinder (34) in a parabolic manner. The image acquisition device (31) can acquire images of the thrown tobacco stems and transmit the image signals to the image processing system (32). The image processing system (32) processes the image signals and controls the opening and closing of the sorting valve (33). The sorting valve (33) can push mixed stems and unqualified stems into the first channel (341), qualified stems enter the second channel (342) along a parabola, and mixed stems fall onto the second conveyor belt (62) along the first channel (341).

7. The photoelectric tobacco stem sorting device according to claim 6, characterized in that: Each of the second channels (342) is provided with a qualified conveyor belt mechanism (35) below it, and the first channel (341) located downstream is provided with a non-qualified conveyor belt mechanism (36) below it.

8. The photoelectric tobacco stem sorting device according to claim 6, characterized in that: The frame (4) is provided with a transparent plate (38) opposite to the image acquisition device (31). The image acquisition device (31) can collect images of the tobacco stem through the transparent plate (38). The frame (4) is provided with a blowing mechanism (39). The blowing mechanism (39) can blow air towards the tobacco stem through the transparent plate (38).

9. The photoelectric tobacco stem sorting device according to claim 6, characterized in that: The frame (4) is equipped with a lighting device (37) at the image acquisition device (31).

Images