Device and method for automatically detecting proportion of cut tobacco and cut stem slivers

Abstract

A device for automatically detecting the proportion of cut tobacco and cut stem slivers comprises a feeding device and further comprises a solid-solid separation device connected with the feeding device, and the solid-solid separation device comprises a first fluidization area connected with the feeding device and a second fluidization area located below the first fluidization area. The solid-solid separation device further comprises a gap adjusting device capable of adjusting the size of a fluidization area wind field gap between the first fluidization area and the second fluidization area. A first blanking bin is arranged below the second fluidization area; a controllable three-way valve is connected above the first fluidization area through a pipeline, the other two ends of the controllable three-way valve are respectively connected with a first blanking bin and a separator of the gas-solid separation device through pipelines, a gas outlet at the top of the separator is connected with a fan, and the second blanking bin is provided with a weight measuring device. According to the invention, the fluidization area is arranged to adjust the airflow speed, and the cut tobacco and the stem slivers are separated, so that the proportion of the cut tobacco and the stem slivers can be obtained, and the detection precision in the production process is improved.

Description

Technical Field

[0001] The invention belongs to the field of mechanical technology, relates to tobacco processing equipment, and specifically relates to an automatic detection device and method for the ratio of tobacco leaves, cuts, stems and sticks. Background Art

[0002] Tobacco technology refers to the technology and method of processing tobacco raw materials and cigarette materials into cigarette products. Its main process, especially the processing from tobacco leaves to tobacco shreds, can be described as follows: the tobacco leaves after initial baking are classified and placed in the production line and enter the leaf moistening machine to moisten the leaves to a certain moisture content. After the leaf beating and separation process, the leaves and stems in the tobacco leaves are separated to obtain tobacco sheets and stems. After re-baking, they are packed in boxes and packaged. After a certain period of storage, they enter the leaf shred and stem shred processes respectively to form tobacco shred samples that can be blended and rolled.

[0003] In the process of beating and separating leaves, since they are generally processed by wind machinery, it is inevitable that a certain proportion of stems and leaves are entrained in the tobacco leaves and tobacco stem products respectively. Under such conditions, when entering the next process, especially when preparing the final tobacco products for rolling, the stems in the tobacco leaves can be converted into stem sticks and mixed with leaf sticks to present in the tobacco products. When the stem sticks in the tobacco are rolled into cigarette products, there is a risk of puncturing the cigarette. At the same time, consumers often experience high inhalation resistance and high tendency of the cigarette to fall when smoking, which may even bring risks of damage to clothing, furniture and fire.

[0004] It can be seen that controlling the stem content in shredded tobacco is the key to preventing risks, and detecting the stem content in shredded tobacco or detecting the tobacco content in stems has become a technical key to controlling and preventing risks and has received widespread attention. For example, the formulated industry standard: YC / T 428-2012 and the paper "Determination of the Tobacco Content in Stems Removed from Cigarette Making Machines" published by Li Bin, as well as the Chinese patent CN102240069 "Instrument for Determining the Tobacco Content in Stems Removed from Cigarette Making Machines" all involve the determination and control of stem content.

[0005] At present, the simple and easy method for measuring the tobacco content in stems is mainly through fluidized separation method. In the process, the material is added once, and after separation, the weights are weighed and calculated. This method is especially suitable when the stems account for a large part of the tobacco. This type of method has the following defects: First, there are interruptions and restarts in the detection equipment conditions, which requires high equipment stability and controllability; second, it is difficult to improve the detection efficiency, and it is not suitable for achieving effective online control of industrial separation equipment; third, when the leaves account for a large part of the tobacco, the entanglement phenomenon is serious, and it is not suitable to achieve effective separation of leaves and stems through fluidization method, which increases the detection error. Summary of the invention

[0006] In order to overcome the technical defects of the prior art, the present invention discloses an automatic detection device and method for the ratio of shredded tobacco leaves to shredded stems.

[0007] The automatic detection device for the ratio of leaf shreds and stems of the present invention comprises a feeding device, and also comprises a solid-solid separation device connected to the feeding device, wherein the solid-solid separation device comprises a first fluidizing zone connected to the feeding device, and a second fluidizing zone located below the first fluidizing zone and having a smaller cross-sectional area than the first fluidizing zone, and the solid-solid separation device also comprises a gap adjustment device capable of adjusting the size of the gap between the first fluidizing zone and the second fluidizing zone; a first drop bin is arranged below the second fluidizing zone; A controllable three-way valve is connected above the first fluidized zone through a pipeline, and the other two ends of the controllable three-way valve are respectively connected to the first drop bin and the separator of the gas-solid separation device through pipelines. The gas outlet at the top of the separator is connected to a fan, and the solid outlet below is aligned with the second drop bin, and the second drop bin is provided with a weight measuring device.

[0008] Preferably, a material dispersing device and a frequency control device for adjusting the rotation frequency of the material dispersing device are provided at the connection between the first fluidizing zone and the second fluidizing zone, and the material dispersing device is a rotatable device with a plurality of blades.

[0009] Preferably, the separator is a cyclone separator.

[0010] Preferably, an air lock is provided below the solid outlet of the cyclone separator.

[0011] Preferably, the feeding device comprises a silo, a sealing device is provided at the opening of the silo, a feeding device is provided at the bottom of the silo, and the feeding device is connected to the first fluidizing zone through a feeding channel.

[0012] Preferably, the controllable three-way valve is connected to a first air supply duct and a second air supply duct, and the first air supply duct and the second air supply duct are respectively connected to the first fluidizing zone and the first material drop bin through the upstream pipe of the first air supply duct and the upstream pipe of the second air supply duct, and the diameter of the first air supply duct is larger than that of the upstream pipe of the first air supply duct, and the diameter of the second air supply duct is larger than that of the upstream pipe of the second air supply duct.

[0013] The present invention also discloses a method for automatically detecting the ratio of leaf shreds to stalks, based on the automatic detection device for the ratio of leaf shreds to stalks as described above, comprising the following steps: Step 1. Turn on the fan and adjust the gap of the wind field in the fluidized zone so that the air flow velocity V1 in the first fluidized zone is set within the range of the blade stripping velocity VT1; the air flow velocity V2 in the second fluidized zone is greater than VT1 and less than VT2, where VT1 and VT2 are the blade stripping and stem stripping velocities respectively; Step 2. The controllable three-way valve is adjusted so that the upper part of the first fluidized zone is connected to the cyclone separator through the controllable three-way valve, and the sample is taken and poured into the feeder. The sample is separated in the solid-solid separation device, and the stems fall into the first drop bin, and the blade shreds enter the gas-solid separator and fall into the second drop bin; the blade shreds in the second drop bin are weighed; Step 3. The controllable three-way valve is adjusted so that the first drop bin is connected to the cyclone separator through the controllable three-way valve, the stalks in the first drop bin are sucked into the cyclone separator and fall into the second drop bin, and the mixture of shredded leaves and stalks in the second drop bin is weighed again; Step 4. Calculate the signature rate.

[0014] The present invention also discloses a tobacco production line, comprising a production line controller and a tobacco stem removal device connected to the production line controller, and also comprising a production line sampling device and a sample temporary storage bin connected to the production line sampling device, wherein the sample temporary storage bin is connected to the feeding device in the automatic detection device for the ratio of leaf shreds to stems as described above, and the weight measuring device in the automatic detection device for the ratio of leaf shreds to stems is connected to the production line controller signal.

[0015] By adopting the automatic detection device and method for the ratio of tobacco leaves to stems of the present invention, the leaves and stems are separated by setting a fluidized area to adjust the air flow speed, and the continuity of the feeding and separation process is maintained to ensure the effective separation of leaves and stems in the tobacco, so that the ratio of the two can be obtained, thereby improving the detection accuracy in the production process; at the same time, the present invention realizes full-automatic control of operating parameters, and the test process is free of human factors and unstable equipment operation problems, thereby ensuring the stability of detection data and greatly improving detection efficiency. Multiple measurement data provide a data basis for stable control and optimization of the process. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a schematic diagram of a specific implementation of the automatic detection device for the ratio of leaf shreds to stems of the present invention; Figure 2 This is a flow chart of a specific implementation method of the method for automatically detecting the ratio of leaf shreds to stems of the present invention; Figure 3 This is a schematic diagram of a specific implementation of the automatic detection device for the ratio of leaf-to-stem ratio of the present invention applied to a tobacco production line; The names of the reference numerals in the figure are: 1. feeding device; 11 silo; 12 sealing device; 13 feeding device; 14 feeding control device; 15 material discharge channel; 2 solid-solid separation device; 21 first fluidizing zone; 22 second fluidizing zone; 23 bulking device; 24 frequency control device; 25 fluidizing zone wind field gap; 26 gap control device; 27 upstream pipeline of the first air conveying pipeline; 28 first material discharge bin; 29 upstream pipeline of the second air conveying pipeline; 3 air conveying device; 31 first air conveying pipeline; 32 second air conveying pipeline; 33 downstream pipeline of the second air conveying pipeline; 34 controllable three-way valve; 35 three-way valve control device; 4 gas-solid separation device; 4-1 cyclone separator; 42 air lock; 43 second material discharge bin; 44 upstream pipeline of fan; 5 weight measuring device; 51 weight sensor; 52 data acquisition and transmission device; 61 fan; 62 wind speed measuring device; 7 sample temporary storage bin; 8 production line sampling device. DETAILED DESCRIPTION

[0017] The following is combined with Figures 1 to 3 , the specific implementation modes of the present invention are further described in detail.

[0018] The inventors conducted a large number of blowing tests on the mixture of leaf shreds and stems obtained after rough processing of tobacco leaves and found that the carry-out speed VT1 of leaf shreds of a certain size and weight obtained in accordance with the tobacco rough processing specifications is generally in the range of 1.0m / s to 2.0m / s, and the carry-out speed VT2 of the stems contained therein is generally in the range of 2.5m / s to 4.4m / s. The so-called carry-out speed refers to the airflow speed required to allow an object to move in a suspended and directional manner with the airflow. It can be found that the carry-out speed of leaf shreds is lower than that of stems, and there is no overlap between the two carry-out speed ranges.

[0019] In practice, the influence of airflow velocity on objects conforms to the general probability distribution because the density of objects, the particle size of objects, and the airflow distribution are not uniform. When the flow velocity is greater than the carry-out velocity and the difference is greater, the proportion of objects carried away by the airflow is higher. When the flow velocity is greater than but close to the carry-out velocity, a small number of objects cannot be carried away by the airflow, and when the flow velocity is less than but close to the carry-out velocity, a small number of objects are still carried away by the airflow. When the airflow velocity is within the carry-out velocity range, the object will settle repeatedly under the action of the airflow, and each time it settles, part of it will rise and part of it will fall.

[0020] Based on the above principle, the inventors designed the automatic detection device and method for the ratio of leaf shreds to stems of the present invention.

[0021] During operation, firstly, the gap control device 26 is used to set the wind field gap 25 of the fluidizing zones between the two fluidizing zones to a set size, the sealing device 12 in the feeding device 1 is opened, and the tobacco shreds consisting of a mixture of leaf shreds and stems are added to the silo 11, and the sealing device 12 in the feeding device 1 is closed; the controllable three-way valve is adjusted through the three-way valve control device 35 in the air delivery device 3 to connect the first air delivery duct 31 with the downstream ducts 33 of the first and second air delivery ducts; the fan power and the gap control device are adjusted so that the air flow velocity V1 of the first fluidizing zone 21 is controlled between 1.5m / s and 1.8m / s, and the air flow velocity V1 of the second fluidizing zone 22 is controlled between 2.0m / s and 2.4m / s.

[0022] Among them, the power of the fan determines the air flow velocity in the first fluidizing zone. The adsorption airflow generated by the fan first enters the first fluidizing zone after attenuation through pipeline transmission, and forms an airflow in the first fluidizing zone. By adjusting the power of the fan, the required air flow velocity can be obtained in the first fluidizing zone.

[0023] The width of the gap 25 in the fluidized zone wind field determines the ratio of the airflow speed in the first fluidized zone and the second fluidized zone. The airflow will change after passing through the gap 25 in the fluidized zone wind field. The larger the gap width, the smaller the airflow speed in the second fluidized zone; conversely, the smaller the gap width, the larger the airflow speed in the first fluidized zone. Since there is a gap smaller than the diameter of the first fluidizing zone at the connection between the first fluidizing zone and the second fluidizing zone, and the cross-sectional area of ​​the second fluidizing zone is smaller than that of the first fluidizing zone, the velocity of the airflow from the second fluidizing zone to the first fluidizing zone will inevitably decrease, making the airflow velocity in the first fluidizing zone smaller than that in the second fluidizing zone. The gap control device 26 can adopt an existing valve that can linearly adjust the opening and closing size.

[0024] The fan 61 is connected to the gas-solid separation device through the fan upstream pipeline 44. When it is turned on, it sucks air from the fan upstream pipeline 44 to form an air flow direction as shown in FIG. Figure 1 As shown, the airflow direction in the fluidized zone is from bottom to top. The wind speed can be measured by the wind speed measuring device 62 connected to the upstream pipeline 44 of the fan, and the wind speed can be adjusted according to the measured data to control the airflow speed in the fluidized zone.

[0025] First, the controllable three-way valve is adjusted so that the top of the first fluidized zone is connected to the cyclone separator through the controllable three-way valve, and the feeding control device 14 is turned on to control the feeding device 13, and the solid-solid separation device 2 is stably fed. The feeding device 13 is a feeding valve; the tobacco enters the solid-solid separation device 2 through the drop channel 15, and the bulking device 23 swings or rotates, and the raw materials temporarily stored in the silo 11 are stably fed to the first fluidized zone in a sealed state. The drop channel is connected to the solid-solid separation device downstream, and the central axis of the drop channel and the central axis of the solid-solid separation device form an inclination angle greater than 45°, preferably, the inclination angle is between 60° and 75°.

[0026] After the mixture of stems and leaf shreds enters the first fluidizing zone, since the air flow velocity V1 in the first fluidizing zone 21 is controlled at 1.5m / s~1.8m / s, which is less than the stem shreds' carrying-out velocity VT2, the stem shreds will randomly drop to the second fluidizing zone. The air flow velocity V1 in the first fluidizing zone is close to the leaf shreds' carrying-out velocity VT1, and is within the range of the leaf shreds' carrying-out velocity. Therefore, the leaf shreds will repeatedly settle in the first fluidizing zone, and a part of the leaf shreds may be sucked away each time they settle, but a small amount will enter the second fluidizing zone.

[0027] The speed of the first fluidizing zone cannot be set too high. Although a higher setting can allow more blades to be sucked away, when the airflow speed is close to VT2, some stems will be adsorbed into the separator, resulting in subsequent detection errors. Therefore, the airflow speed of the first fluidizing zone is set within the range of the blade outflow speed to prevent stems from entering the separator.

[0028] The stems enter the second fluidizing zone. Although the speed of the second fluidizing zone is higher than that of the first fluidizing zone, the air flow speed in the second fluidizing zone is still lower than the speed at which the stems are carried out. At this time, the stems will continue to slowly drop into the first drop bin 28. Even if a small amount of stems enter the first fluidizing zone, they will fall back into the second fluidizing zone due to the low flow rate in the first fluidizing zone. However, the speed of the second fluidizing zone is significantly higher than the speed at which the shredded tobacco leaves are carried out VT1, so that the shredded tobacco leaves entering the second fluidizing zone will rise again into the first fluidizing zone and be sucked away, thereby realizing the separation of the shredded tobacco leaves and the stems.

[0029] At the same time, the air flow velocity in the second fluidizing zone is greater than the blade carrying velocity VT1, so that even if a small amount of blade enters the second fluidizing zone under the action of gravity, it will be brought back to the first fluidizing zone by the rising air flow, thereby greatly reducing the blades falling into the first drop bin 28.

[0030] A material dispersing device 23 is provided between the two fluidized zones, and the swing or rotation frequency of the material dispersing device 23 can be controlled by a frequency control device 24, so as to adjust the feeding effect. The material dispersing device is a rotatable device with multiple blades, similar to fan blades. When the raw materials pass through, the blades rotate to disperse the raw materials, thereby separating the stems and blade fibers therein.

[0031] After the shredded tobacco leaves are separated from the stems, in the first fluidizing zone, since the air flow velocity in this zone is usually slightly greater than the carrying-out velocity of the shredded tobacco leaves, the shredded tobacco leaves will randomly rise during the fluidizing process in the first fluidizing zone. Once the shredded tobacco leaves rise to the vicinity of the upstream pipe 27 of the first air conveying duct, since the pipe diameter is reduced relative to the first fluidizing zone and the air velocity is increased, the shredded tobacco leaves will enter the upstream pipe 27 of the first air conveying duct, and enter the cyclone separator 41 through the upstream pipe 27 of the first air conveying duct, the first air conveying duct 31, and the downstream pipe 33 of the second air conveying duct, and settle into the second drop bin 43 through the air lock at the lower end of the cyclone separator 41. At this time, the shredded tobacco leaves and the stems are separated in position by the solid-solid separation device and the air-solid separation device.

[0032] Figure 1 In the specific embodiment shown, the air lock 42 at the bottom of the cyclone separator 41 is a rotary discharger, which allows the blades to pass through the air lock and fall into the second discharge bin through a rotary discharge method.

[0033] Among them, the diameter of the first air supply pipe can be set to be smaller than the upstream pipe of the first air supply pipe; the diameter of the second air supply pipe can be set to be smaller than the upstream pipe of the second air supply pipe; so that the flow rate can be further increased when the airflow passes through.

[0034] After separation, this batch of feeding is completed, and the weight M1 of the shredded leaves in the second feeding bin 43 at this time is recorded by the weight measuring device 5.

[0035] like Figure 1 As shown, the weight measuring device 5 includes a weight sensor 51 and a data acquisition and transmission device 52. The weight sensor 51 transmits the detected data to the data acquisition and transmission device 52 for recording, storing and sending the data. The data acquisition and transmission device 52 can be a laptop computer.

[0036] Subsequently, the controllable three-way valve 34 is adjusted through the three-way valve control device 25 in the air delivery device 3 to connect the second air delivery duct 32 with the downstream duct 33 of the first and second air delivery ducts, and the stems in the first drop bin 28 will enter the second drop bin 43 through the upstream duct 29 of the second air delivery duct, the second air delivery duct 32, the downstream duct 33 of the first and second air delivery ducts, the cyclone separator 41 and the air lock 42. At this time, the weight measuring device 5 records the increased weight of the second drop bin 43 as the stem weight M2, returns all controllable actions to the initial setting state, and after obtaining the leaf weight M1 and the stem weight M2, the weight ratio of the stems and the leaf shreds of this feed can be obtained.

[0037] Repeating the above process can automatically measure the ratio of leaf shreds to stems in tobacco. Since there is no human influence and it can be fully automatic, continuity is achieved by setting a sample temporary storage bin between continuous sampling and the silo, thus realizing continuous automatic detection of the ratio of leaf shreds to stems in tobacco.

[0038] The method for automatically detecting the ratio of shredded leaves to stalks of the present invention may include the following steps: Step 1. Turn on the fan and adjust the gap of the wind field in the fluidized zone so that the air flow velocity V1 in the first fluidized zone is set within the range of the blade stripping velocity VT1; the air flow velocity V2 in the second fluidized zone is greater than VT1 and less than VT2, where VT1 and VT2 are the blade stripping and stem stripping velocities respectively; Step 2. The controllable three-way valve is adjusted so that the upper part of the first fluidized zone is connected to the cyclone separator through the controllable three-way valve, and the sample is poured into the feeder. The sample is separated in the solid-solid separation device, the stems fall into the first drop bin, and the blades enter the gas-solid separator and fall into the second drop bin; After the sorting in step 2 is completed, the shredded leaves in the second bin are weighed; Step 3. The controllable three-way valve is adjusted so that the first drop bin is connected to the cyclone separator through the controllable three-way valve, the stalks in the first drop bin are sucked into the cyclone separator and fall into the second drop bin, and the mixture of shredded leaves and stalks in the second drop bin is weighed again; Step 4. Calculate the stem content, i.e., the ratio of stems to leaves. The obtained data is uploaded to the production control system on the production line. At the same time, the mixture of leaves and stems after testing is sent back to the production line for production.

[0039] The present invention is applied in a tobacco production line, which includes a production line controller and a stem removal device connected to the production line controller, a production line sampling device and a sample temporary storage bin connected to the production line sampling device, the sample temporary storage bin is connected to a feeding device in the automatic detection device for the ratio of leaf shreds to stems, and a weight measuring device in the automatic detection device for the ratio of leaf shreds to stems is connected to the production line controller signal.

[0040] The tobacco production line can control the stem pick removal device in the existing tobacco production line through the measurement results of the automatic detection device for the ratio of leaf-to-stem ratio. For example, when the production line controller detects that the stem pick content is higher than the standard value, it adjusts the operating parameters of the removal device to improve the stem pick removal effect. Figure 1 As shown, samples are usually taken from the sample temporary storage bin 7 to the feeding device 1. The samples in the sample temporary storage bin 7 come from the production line sampling device 8. The production line sampling device 8 samples the raw materials after the stems are removed from the production line, thereby realizing the inspection and control of the stem removal effect of the production line.

[0041] The following is the test data of the signature rate of 10 batches of standard samples using the present invention. It can be seen that the error between the test results obtained by the present invention and the actual signature rate of the standard samples is basically controlled at about 0.1%.

[0042]

[0043] By adopting the automatic detection device and method for the ratio of tobacco leaves to stems of the present invention, the leaves and stems are separated by setting a fluidized area to adjust the air flow speed, and the continuity of the feeding and separation process is maintained to ensure the effective separation of leaves and stems in the tobacco, so that the ratio of the two can be obtained, thereby improving the detection accuracy in the production process; at the same time, the present invention realizes full-automatic control of operating parameters, and the test process is free of human factors and unstable equipment operation problems, thereby ensuring the stability of detection data and greatly improving detection efficiency. Multiple measurement data provide a data basis for stable control and optimization of the process.

[0044] The foregoing describes various preferred embodiments of the present invention. Unless the preferred implementation modes in various preferred embodiments are obviously self-contradictory or based on a certain preferred implementation mode, various preferred implementation modes can be arbitrarily superimposed and used in combination. The embodiments and specific parameters in the embodiments are only for clearly describing the invention verification process of the inventor, and are not intended to limit the patent protection scope of the present invention. The patent protection scope of the present invention shall still be based on its claims. All equivalent structural changes made using the contents of the specification and drawings of the present invention should be included in the protection scope of the present invention.

Claims

1. An automatic detection device for the ratio of leaf shreds to stems, comprising a feeding device, characterized in that: It also includes a solid-solid separation device connected to the feeding device, the solid-solid separation device includes a first fluidizing zone connected to the feeding device, a second fluidizing zone located below the first fluidizing zone and having a smaller cross-sectional area than the first fluidizing zone, and the solid-solid separation device also includes a gap adjustment device capable of adjusting the size of the gap between the first fluidizing zone and the second fluidizing zone; a first drop bin is provided below the second fluidizing zone; A controllable three-way valve is connected above the first fluidized zone through a pipeline, and the other two ends of the controllable three-way valve are respectively connected to the first drop bin and the separator of the gas-solid separation device through pipelines. The gas outlet at the top of the separator is connected to a fan, and the solid outlet below is aligned with the second drop bin, and the second drop bin is provided with a weight measuring device.

2. The automatic detection device for the ratio of shredded leaves to stalks as claimed in claim 1, characterized in that: A material dispersing device and a frequency control device for adjusting the rotation frequency of the material dispersing device are arranged at the connection between the first fluidizing zone and the second fluidizing zone. The material dispersing device is a rotatable device with a plurality of blades.

3. The automatic detection device for the ratio of shredded leaves to stalks as claimed in claim 1, characterized in that: The separator is a cyclone separator.

4. The automatic detection device for the ratio of shredded leaves to stalks as claimed in claim 3, characterized in that: An air lock is arranged below the solid outlet of the cyclone separator.

5. The automatic detection device for the ratio of shredded leaves to stalks as claimed in claim 1, characterized in that: The feeding device comprises a silo, a sealing device is arranged at the opening of the silo, a feeding device is arranged at the bottom of the silo, and the feeding device is connected to the first fluidizing zone through a feeding channel.

6. The automatic detection device for the ratio of shredded leaves to stalks as claimed in claim 1, characterized in that: The controllable three-way valve is connected to the first air supply duct and the second air supply duct, and the first air supply duct and the second air supply duct are respectively connected to the first fluidizing area and the first material drop bin through the first air supply duct upstream duct and the second air supply duct upstream duct. The diameter of the first air supply duct is larger than that of the first air supply duct upstream duct, and the diameter of the second air supply duct is larger than that of the second air supply duct upstream duct.

7. A method for automatically detecting the ratio of leaf shreds to stems, characterized in that: The automatic detection device for the ratio of leaf shreds to stems according to any one of claims 1 to 7 comprises the following steps: Step 1. Turn on the fan and adjust the gap of the wind field in the fluidized zone so that the air flow velocity V1 in the first fluidized zone is set within the range of the blade stripping velocity VT1; the air flow velocity V2 in the second fluidized zone is greater than VT1 and less than VT2, where VT1 and VT2 are the blade stripping and stem stripping velocities respectively; Step 2. The controllable three-way valve is adjusted so that the upper part of the first fluidized zone is connected to the cyclone separator through the controllable three-way valve, and the sample is taken and poured into the feeder. The sample is separated in the solid-solid separation device, and the stems fall into the first drop bin, and the blade shreds enter the gas-solid separator and fall into the second drop bin; the blade shreds in the second drop bin are weighed; Step 3. The controllable three-way valve is adjusted so that the first drop bin is connected to the cyclone separator through the controllable three-way valve, the stalks in the first drop bin are sucked into the cyclone separator and fall into the second drop bin, and the mixture of shredded leaves and stalks in the second drop bin is weighed again; Step 4. Calculate the signature rate.

8. A tobacco production line, comprising a production line controller and a stem removal device connected to the production line controller, characterized in that: It also includes a production line sampling device and a sample temporary storage bin connected to the production line sampling device, the sample temporary storage bin is connected to the feeding device in the automatic detection device for the ratio of leaf shreds to stems as described in any one of claims 1 to 6, and the weight measuring device in the automatic detection device for the ratio of leaf shreds to stems is connected to the production line controller signal.

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