An on-line detection device for the content of stem pieces in cut tobacco and an on-line regulation method for the content of stem pieces in cigarettes

Abstract

The present invention belongs to the technical field of tobacco processing technology, and particularly relates to an on-line detection device for the content of stem chips in cut tobacco and an on-line regulation method for the content of stem chips in cigarettes. The device mainly includes: a cut tobacco vibrating conveying device, a vertical feeding pipe, a feeding air lock, an inclined feeding pipe, a vertically entering air pipe, a vertical conveying pipe, a horizontal transparent conveying pipe, an image recognition system, a cyclone separator, an exhaust pipe, a vertical falling pipe, a discharging air lock, etc. The present invention also discloses an on-line regulation method for the content of stem chips in cigarettes by using the on-line detection device for the content of stem chips in cut tobacco. The device of the present invention can continuously and on-line quantitatively detect the content of stem chips in cut tobacco, and the method of the present invention can effectively control the content of stem chips in subsequent cigarettes.

Description

Technical Field

[0001] The present invention belongs to the technical field of tobacco processing technology, and particularly relates to an on-line detection device for the content of stem pieces in cut tobacco and an on-line regulation method for the content of stem pieces in cigarettes. Background Technique

[0002] Stem pieces are inevitably generated during the key process of cutting tobacco stems and veins in the wire-making process. Stem pieces rolled into cigarettes will cause cigarette sticks to be punctured, resulting in defects in the appearance quality of cigarette sticks. They will also cause uneven tightness of cigarette sticks, thereby affecting physical quality indicators such as the weight and draw resistance of cigarette sticks. At the same time, stem pieces produce unpleasant odors when burning, affecting the sensory quality of cigarette sticks. Therefore, it is necessary to effectively remove stem pieces in cut tobacco before rolling to reduce the content of stem pieces in cigarette sticks and stabilize and improve the quality of cigarette products.

[0003] Controlling the content of stem pieces in cigarette sticks has always been the focus and difficulty of process control in cigarette enterprises. At present, during the cigarette processing process, the removal of stem pieces mainly focuses on the stem piece separation system (inlet air distribution pipe) of the cigarette machine in the rolling link, which separates stem pieces with a relatively large suspension speed from cut tobacco through the principle of air flotation. Due to the insignificant difference in density attributes between stem pieces and cut tobacco, it is difficult to simultaneously consider indicators such as the removal rate of stem pieces and the loss of cut tobacco during the air separation process. That is, when the removal rate of stem pieces in cut tobacco is increased, the content of cut tobacco in the removed stem pieces also increases accordingly, resulting in cut tobacco consumption. Therefore, in order to effectively reduce the content of stem pieces in cigarette sticks while minimizing cut tobacco consumption, it is necessary to perform on-line real-time regulation on the stem piece separation system of the cigarette machine according to the content of stem pieces in the incoming cut tobacco, which is the key to solving the control of stem pieces in cigarette sticks.

[0004] At present, Chinese Patent CN104266928A discloses an inspection device for the content of stem pieces in cut tobacco, including a air supply mechanism, a fluidizing air control system and a vertical cylinder mechanism. In the detection device, cut tobacco and stem pieces are quickly separated by air separation using the different critical fluidization air velocities of cut tobacco and stem pieces. It is an off-line detection device for the content of stem pieces in cut tobacco. Chinese Patents CN113888468A, CN116245820A, CN115039905A, CN116210951A, etc. disclose various methods for detecting stem pieces in cut tobacco based on image recognition, multi-dimensional perspective image recognition, etc., but do not involve an on-line detection device for detecting the content of stem pieces in cut tobacco based on image recognition. Chinese Patent CN217791437U discloses an on-line monitoring device for removing stem pieces from cigarette sticks, which is arranged between the discharge port of the air separation device of the cigarette machine and the centralized dust removal device. The on-line calculation of the removed stem pieces is completed through the stem piece weight detection system and the on-line monitoring of the stem piece removal amount is uploaded in real time. The object of on-line detection of this device is the weight of the stem piece removal of the cigarette machine. The stem piece removal of the air separation device mainly consists of stem pieces and cut tobacco, rather than the content of stem pieces in cut tobacco.

[0005] Chinese Patent CN115067542A discloses an on-line monitoring device for removing stem pieces from cigarette rods and a method for controlling the content of stem pieces. It mainly monitors the flow rate of stem piece removal from a cigarette making machine online, then sets a threshold for the flow rate of removed stem pieces, and controls the content of stem pieces by adjusting the air separation parameters of the air separation device. The purpose of this method is to improve the stability of the amount of stem pieces removed from the cigarette making machine, but it cannot handle the control of the stem piece content when the stem piece content in the incoming cut tobacco changes, nor can it effectively regulate the stem piece content in the cigarette rod.

[0006] Stem pieces can be classified into fine stem pieces and thick stem pieces according to the particle size. The literature (Acta Tabacaria Sinica, 2021, 27(1)) analyzed the particle size of stem pieces puncturing cigarette rods and believed that the probability of fine stem pieces with a width less than 0.7 mm or a length less than 1.0 mm puncturing cigarette rods is relatively small, while thick stem pieces with a width greater than 0.7 mm or a length greater than 3.0 mm have a greater impact on cigarette rod puncturing, and there are certain differences in the impact on regular cigarettes, medium-sized cigarettes, and slender cigarettes.

[0007] In view of this, in order to effectively solve the problem of controlling the stem piece content in cigarette rods, the present invention is proposed. Summary of the Invention

[0008] The purpose of the present invention is to provide an on-line detection device for the stem piece content in cut tobacco and a method for regulating the stem piece content in cigarette rods in view of the deficiencies of the prior art. The device of the present invention can effectively detect the stem piece content in cut tobacco online and quantitatively analyze the proportion of the number of stem pieces in cut tobacco (number of stem pieces / 100 cut tobaccos). The method of the present invention can effectively control the stem piece content in cigarette rods, thereby stabilizing and improving the quality of cigarette products.

[0009] The technical solution of the present invention is as follows:

[0010] The first aspect of the present invention discloses an on-line detection device for the stem piece content in cut tobacco, which includes: cut tobacco inlet N1, cut tobacco outlet N2, compressed air inlet H1, compressed air outlet H2, cut tobacco vibration conveying device 1, feeding port 2, vertical feeding pipe 3, feeding air lock 4, inclined feeding pipe 5, vertical air inlet pipe 6, vertical conveying pipe 7, elbow 8, horizontal transparent conveying pipe 9, image recognition system I11, image recognition system II18, gas-solid separation device 20, exhaust pipe 21, vertical blanking pipe 22, discharging air lock 23, and blanking port 24.

[0011] The cut tobacco inlet N1 is located at the upstream end of the cut tobacco vibration conveying device 1; the cut tobacco outlet N2 is located at the downstream end of the cut tobacco vibration conveying device 1; the compressed air inlet H1 is located at the bottom end of the vertical air inlet pipe 6; the compressed air outlet H2 is located at the top end of the exhaust pipe 21.

[0012] The feeding port 2 is located upstream of the vibrating tobacco conveying device 1 and is connected to the vibrating tobacco conveying device 1 in a through manner; the vertical feeding pipe 3 is located below the feeding port 2 and is connected to the feeding port 2; the feeding air lock 4 is arranged above the downstream in the vertical feeding pipe 3 for adjusting the flow rate of the tobacco material and preventing compressed air from overflowing upward along the vertical feeding pipe 3; the inclined feeding pipe 5 is located below the vertical feeding pipe 3 and is connected to the vertical feeding pipe 3; the inclined feeding pipe 5 is connected to the lower part of the vertical conveying pipe 7 in a through manner; the vertical air inlet pipe 6 is located at the bottom end of the vertical conveying pipe 7 and is connected to the vertical conveying pipe 7 in a through manner;

[0013] The top end of the vertical conveying pipe 7 is connected to the elbow pipe 8; the downstream end of the elbow pipe 8 is connected to the horizontal transparent conveying pipe 9; above and below the horizontal transparent conveying pipe 9, an image recognition system I11 and an image recognition system II18 for real-time recognition of the content of midribs in the tobacco are arranged respectively;

[0014] The downstream end of the horizontal transparent conveying pipe 9 is connected to the gas-solid separation device 20 in a through manner; the top end of the gas-solid separation device 20 is connected to the exhaust pipe 21; the bottom end of the gas-solid separation device 20 is connected to the vertical falling pipe 22; the discharging air lock 23 is arranged in the vertical falling pipe 22 for the uniform falling of the tobacco material and preventing compressed air from overflowing downward along the vertical falling pipe 22; the bottom end of the vertical falling pipe 22 is connected to the falling port 24; the falling port 24 is located above the downstream of the vibrating tobacco conveying device 1.

[0015] Preferably, the image recognition system I11 includes a light source I13, an image acquisition camera I14, a data information connection line I12, and a computer I10, and the image recognition system II18 includes an image acquisition camera II15, a light source II16, a data information connection line II17, and a computer II19.

[0016] The image recognition system is used for real-time recognition of the content of midribs in the tobacco, and the specific design belongs to the prior art.

[0017] Preferably, the tobacco entering the vibrating tobacco conveying device 1 is one of cut tobacco, stem cut tobacco, and finished tobacco, and the material flow rate can be adjusted within the range of 1000 - 3000 kg / h.

[0018] Preferably, the wind speed range of the compressed air entering the vertical conveying pipe 7 from the vertical air inlet pipe 6 is 15 - 18 m / s and can be adjusted.

[0019] Preferably, the detection frequency range of the image recognition system I11 and the image recognition system II18 is 1 - 20 s and can be adjusted.

[0020] In this application, the direction of material / air movement is counted as from upstream to downstream.

[0021] The second aspect of the present invention discloses an online regulation method for the content of stem pieces in cigarette rods. Using the above-mentioned online detection device for the content of stem pieces in cut tobacco, it specifically includes the following two steps:

[0022] Step 1: Detection of the content of stem pieces in finished cut tobacco

[0023] After the finished cut tobacco leaves the storage bin and before it is transported to the cigarette maker for rolling, use the online detection device for the content of stem pieces in cut tobacco described in the first aspect to detect the proportion of the number of stem pieces with a width greater than 1.0 mm and a length greater than 3.0 mm in the finished cut tobacco, that is, the number of stem pieces per 100 cut tobacco strands;

[0024] Step 2: Online regulation of the content of stem pieces in cigarette rods

[0025] In the rolling process, based on the proportion of the number of stem pieces with a width greater than 1.0 mm and a length greater than 3.0 mm detected in Step 1 and the lag time of the finished cut tobacco transported to the rolling process, combined with the control level of the content of stem pieces in cigarette rods, the wind speed of the feeding air distribution pipe on the cigarette maker is regulated online.

[0026] Preferably, with the goal of controlling the content of stem pieces in cigarette rods within 3%, when the content of stem pieces in the incoming finished cut tobacco is different, the wind speed of the feeding air distribution pipe on the cigarette maker is regulated as follows:

[0027] (1) When the detected proportion of the number of stem pieces with a width greater than 1.0 mm and a length greater than 3.0 mm in the finished cut tobacco ≤ 5 stem pieces per 100 cut tobacco strands, the wind speed of the feeding air distribution pipe on the cigarette maker is controlled at 5.0 m / s;

[0028] (2) When the detected proportion of the number of stem pieces with a width greater than 1.0 mm and a length greater than 3.0 mm in the finished cut tobacco is in the range of 5 stem pieces per 100 cut tobacco strands to 8 stem pieces per 100 cut tobacco strands, the wind speed of the feeding air distribution pipe on the cigarette maker is controlled at 4.0 m / s;

[0029] (3) When the detected proportion of the number of stem pieces with a width greater than 1.0 mm and a length greater than 3.0 mm in the finished cut tobacco ≥ 8 stem pieces per 100 cut tobacco strands, the wind speed of the feeding air distribution pipe on the cigarette maker is controlled at 3.0 m / s.

[0030] The feeding air distribution pipe on the cigarette maker is for the subsequent process of removing stem pieces from the cut tobacco. Currently, the wind speed of the feeding air distribution pipe on the cigarette maker is adjusted manually according to experience.

[0031] The present invention has the following beneficial effects compared with the prior art:

[0032] 1. The on-line detection device for the content of stem chips in cut tobacco of the present invention mainly includes a vibrating cut tobacco conveying device, a vertical feeding pipe, a feeding air lock, an inclined feeding pipe, a vertically entering air duct, a vertical conveying pipe, a horizontally transparent conveying pipe, an image recognition system, a gas-solid separation device, an exhaust pipe, a vertical falling pipe, a discharging air lock, etc. This device can be matched with processes such as after drying cut tobacco, after flavoring, and after the finished cut tobacco leaves the cabinet in the cut tobacco production line of cigarette enterprises, and is used for on-line quantitatively detecting the content of stem chips in cut tobacco, cut stem, finished cut tobacco, etc., providing data support for removing stem chips in cut tobacco in subsequent processes.

[0033] 2. The on-line detection device for the content of stem chips in cut tobacco of the present invention is provided with two sets of image recognition systems at two positions, upper and lower, of the horizontally transparent conveying pipe, which can accurately, comprehensively and quickly detect and identify stem chips in cut tobacco, without contacting the cut tobacco and causing damage to the cut tobacco. At the same time, the cut tobacco after detection is re-mixed, and there will be no cut tobacco loss.

[0034] 3. The on-line regulation method for the content of stem chips in cigarettes of the present invention uses the on-line detection device for the content of stem chips in cut tobacco to detect the proportion of the number of stem chips with a width greater than 1.0 mm and a length greater than 3.0 mm in cut tobacco after the finished cut tobacco leaves the cabinet, and realizes the real-time and effective control of the content of stem chips in cigarettes by optimizing and regulating the key process parameter of the process air speed in the feeding air distribution pipe on the cigarette making machine, which can effectively reduce the content of stem chips in cigarettes while minimizing the cut tobacco consumption, and has a good effect on improving the quality, stabilizing the quality, controlling the cost and increasing the efficiency in the cigarette processing process.

[0035] 4. The on-line regulation method for the content of stem chips in cigarettes of the present invention is applicable to the processing processes of all specifications of cigarettes such as regular, medium-sized and thin-sized cigarettes, and has a good effect on controlling the content of stem chips in cigarettes of different specifications, and has good application prospects and application values in the whole tobacco industry. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required to be used in the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings;

[0037] Figure 1 It is a schematic diagram of the overall structure of the on-line detection device for the content of stem chips in cut tobacco of the present invention.

[0038] Figure 2 It is a process flow chart of the four positions where the on-line detection device for the content of stem chips in cut tobacco of the present invention can be set, namely after drying cut tobacco leaves①, after drying cut stem②, after blending and flavoring③, and after storing cut tobacco④ in the cut tobacco production line.

[0039] Figure 3This is the process flow chart for on-line regulation of the content of stem pieces in the cigarette rod of the present invention.

[0040] Reference numerals: N1 - tobacco shred inlet; N2 - tobacco shred outlet; H1 - compressed air inlet; H2 - compressed air outlet; 1 - tobacco shred vibrating conveying device; 2 - feeding port; 3 - vertical feeding pipe; 4 - feeding air lock; 5 - inclined feeding pipe; 6 - vertical air inlet pipe; 7 - vertical conveying pipe; 8 - elbow pipe; 9 - horizontal transparent conveying pipe; 10 - computer I; 11 - image recognition system I; 12 - data information connection line I; 13 - light source I; 14 - image acquisition camera I; 15 - image acquisition camera II; 16 - light source II; 17 - data information connection line II; 18 - image recognition system II; 19 - computer II; 20 - gas-solid separation device; 21 - exhaust pipe; 22 - vertical falling pipe; 23 - discharging air lock; 24 - falling port. Detailed implementation mode

[0041] The present invention will be further described below in conjunction with the drawings and embodiments. However, the drawings and embodiments do not limit the technical solutions of the present invention. Any transformation or improvement made based on the teachings of the present invention falls within the protection scope of the present invention.

[0042] Embodiment 1: On-line detection of the content of stem pieces in tobacco shreds after leaf shred drying

[0043] As Figure 1 shown, an on-line detection device for the content of stem pieces in tobacco shreds includes: tobacco shred inlet N1, tobacco shred outlet N2, compressed air inlet H1, compressed air outlet H2, tobacco shred vibrating conveying device 1, feeding port 2, vertical feeding pipe 3, feeding air lock 4, inclined feeding pipe 5, vertical air inlet pipe 6, vertical conveying pipe 7, elbow pipe 8, horizontal transparent conveying pipe 9, computer I 10, image recognition system I 11, data information connection line I 12, light source I 13, image acquisition camera I 14, image acquisition camera II 15, light source II 16, data information connection line II 17, image recognition system II 18, computer II 19, gas-solid separation device 20, exhaust pipe 21, vertical falling pipe 22, discharging air lock 23 and falling port 24.

[0044] Among them, the tobacco shred inlet N1 is located at the left end of the tobacco shred vibrating conveying device 1; the tobacco shred outlet N2 is located at the right end of the tobacco shred vibrating conveying device 1; the compressed air inlet H1 is located at the bottom end of the vertical air inlet pipe 6; the compressed air outlet H2 is located at the top end of the exhaust pipe 21.

[0045] The feeding port 2 is located directly below the center of the left-side tobacco shred conveying of the tobacco shred vibrating conveying device 1 and is connected to the tobacco shred vibrating conveying device 1 in a through manner; the vertical feeding pipe 3 is located below the feeding port 2 and is connected to the feeding port 2; the feeding air lock 4 is arranged in the middle of the vertical feeding pipe 3 for adjusting the flow rate of the tobacco shred material and preventing compressed air from overflowing upward along the vertical feeding pipe 3; the inclined feeding pipe 5 is located below the vertical feeding pipe 3 and is connected to the vertical feeding pipe 3; the inclined feeding pipe 5 is connected to the lower part of the vertical conveying pipe 7 in a through manner; the vertical air inlet pipe 6 is located at the bottom end of the vertical conveying pipe 7 and is connected to the vertical conveying pipe 7 in a through manner;

[0046] The top end of the vertical conveying pipe 7 is connected to the elbow pipe 8; the right end of the elbow pipe 8 is connected to the horizontal transparent conveying pipe 9; the image recognition system I11 and the image recognition system II18 are respectively arranged above the left side and below the right side of the horizontal transparent conveying pipe 9. Among them, the image recognition system I11 includes a light source I13, an image acquisition camera I14, a data information connection line I12, and a computer I10, and the image recognition system II18 includes an image acquisition camera II15, a light source II16, a data information connection line II17, and a computer II19;

[0047] The right end of the horizontal transparent conveying pipe 9 is connected to the gas-solid separation device 20 in a tangential through manner; the top end of the gas-solid separation device 20 is connected to the exhaust pipe 21; the bottom end of the gas-solid separation device 20 is connected to the vertical falling pipe 22; the discharging air lock 23 is arranged in the middle of the vertical falling pipe 22 for the uniform falling of the tobacco shred material and preventing compressed air from overflowing downward along the vertical falling pipe 22; the bottom end of the vertical falling pipe 22 is connected to the falling port 24; the falling port 23 is located above the right side of the tobacco shred vibrating conveying device 1.

[0048] The gas-solid separation device 20 is specifically a cyclone separator.

[0049] Among them, the tobacco shreds entering the tobacco shred vibrating conveying device 1 are the tobacco shreds after leaf drying, and the material flow rate is 1000 kg / h.

[0050] Among them, the wind speed range of the compressed air entering the vertical conveying pipe 7 from the vertical air inlet pipe 6 is 16 m / s.

[0051] Among them, the detection frequency range of the image recognition system I11 and the image recognition system II18 is 5 s.

[0052] The experimental object of this embodiment is the tobacco shreds after leaf drying in a 1000 kg cigarette making line of a certain cigarette enterprise. The above on-line detection device for the content of stem and stick in tobacco shreds is used to continuously detect it for 100 s, and the results are shown in Table 1. Among them, the content of stem and stick in tobacco shreds is expressed by the number of stem and stick per 100 tobacco shreds.

[0053] Table 1 Detection Results of the Content of Stems in Cut Tobacco after Cut Tobacco Drying

[0054]

[0055] As can be seen from Table 1, the on-line detection device for the content of stems in cut tobacco of the present invention is used to on-line detect the content of stems in the cut tobacco after cut tobacco drying in the 1000 kg cut tobacco production line of a cigarette enterprise. The results show that the content range of stems in the cut tobacco after cut tobacco drying is 3.00% - 4.20%, and the average value is 3.60%.

[0056] Example 2: On-line Detection of the Content of Stems in Cut Tobacco after Cut Tobacco Leaves the Cabinet

[0057] The experimental object of this example is the finished cut tobacco after the cut tobacco storage in the 1000 kg cut tobacco production line of a cigarette enterprise. The on-line detection device for the content of stems in cut tobacco under the same conditions as in Example 1 is used to continuously detect the content of stems in the finished cut tobacco for 100 s. The results are shown in Table 2. Among them, the content of stems in cut tobacco is expressed as the number of stem pieces / 100 cut tobacco strands.

[0058] Table 2 Detection Results of the Content of Stems in Finished Cut Tobacco

[0059]

[0060] As can be seen from Table 2, by using the on-line detection device for the content of stems in cut tobacco of the present invention, the content range of stems in the finished cut tobacco after the finished cut tobacco leaves the cabinet in the 1000 kg cut tobacco production line of the cigarette enterprise is 4.80% - 5.70%, and the average value is 5.32%.

[0061] Example 3: On-line Regulation of the Content of Stems in Cigarettes

[0062] The experimental object of this example is the finished cut tobacco after the cut tobacco storage in the 1000 kg cut tobacco production line of a cigarette enterprise in Example 2. With the goal of controlling the content of stems in the cigarettes after rolling within 3%, the method of the present invention is used to on-line regulate the content of stems in the cigarettes, which specifically includes the following two steps:

[0063] Step 1: Detection of the Content of Stems in Finished Cut Tobacco

[0064] After the finished cut tobacco leaves the cabinet and before the finished cut tobacco is transported to the cigarette making machine for rolling, the on-line detection device for the content of stems in cut tobacco of the present invention is used to detect the proportion of the number of stem pieces with a width greater than 1.0 mm and a length greater than 3.0 mm in the finished cut tobacco, that is, the number of stem pieces / 100 cut tobacco strands;

[0065] Step 2: On-line Regulation of the Content of Stems in Cigarettes

[0066] In the rolling process, according to the proportion of the number of stem pieces with a width greater than 1.0 mm and a length greater than 3.0 mm in the finished cut tobacco detected in Step 1 and the lag time of the finished cut tobacco transported to the rolling process, combined with the control level of the stem piece content in the cigarette, the air velocity of the feeding air distribution pipe on the cigarette making machine is regulated online. Among them, when the stem piece content in the different incoming finished cut tobacco is different, the air velocity regulation of the feeding air distribution pipe on the cigarette making machine is as follows:

[0067] (1) When the proportion of the number of stem pieces with a width greater than 1.0 mm and a length greater than 3.0 mm in the detected finished cut tobacco ≤ 5 stem pieces / 100 cut tobaccos, the air velocity of the feeding air distribution pipe on the cigarette making machine is controlled at 5.0 m / s;

[0068] (2) When the proportion of the number of stem pieces with a width greater than 1.0 mm and a length greater than 3.0 mm in the detected finished cut tobacco is in the range of 5 stem pieces / 100 cut tobaccos to 8 stem pieces / 100 cut tobaccos, the air velocity of the feeding air distribution pipe on the cigarette making machine is controlled at 4.0 m / s;

[0069] (3) When the proportion of the number of stem pieces with a width greater than 1.0 mm and a length greater than 3.0 mm in the detected finished cut tobacco ≥ 8 stem pieces / 100 cut tobaccos, the air velocity of the feeding air distribution pipe on the cigarette making machine is controlled at 3.0 m / s.

[0070] Furthermore, samples are taken from the regulated cigarettes. 500 g of cut tobacco is manually stripped out and evenly divided into five equal parts, and detected by the general TD-Z100 type offline detection device for the stem piece content in cut tobacco in the tobacco industry. The results are shown in Table 3. Among them, the stem piece content in the cigarette is expressed as stem piece weight / (cut tobacco + stem piece) weight * 100%.

[0071] Table 3 Detection results of the stem piece content in the regulated cigarettes

[0072] Detect equal parts Stem content in cigarette 1 1.84％ 2 1.93％ 3 2.48％ 4 2.29％ 5 2.13％ Mean value 2.13％

[0073] As can be seen from Table 3, after the online regulation of the stem piece content in the cigarette by the method of the present invention, the stem piece content in the cigarette ranges from 1.80% to 2.50%, and the average value is 2.23%, meeting the requirement of controlling the stem piece content in the cigarette within 3%. It shows that the method of the present invention can effectively realize the regulation of the stem piece content in the cigarette, and the effect is good.

[0074] Combined with Example 1, Example 2 and Example 3, it can be seen that the device of the present invention can continuously detect the stem piece content in cut tobacco online quantitatively, and the method of the present invention can effectively control the stem piece content in the subsequent cigarettes, and thus play a good role in improving the quality, stabilizing the quality, controlling the cost and increasing the efficiency of the cigarette processing process.

[0075] The above is only used to introduce the specific implementation manners of the present invention in detail, but the technical solutions proposed by the present invention are not limited to the above methods. Without departing from the basic principles of the present technology, equivalent modifications and changes made by those skilled in the art to the technologies proposed by the present invention should all be covered within the scope of the claims of the present invention.

Claims

1. An online detection device for stem content in tobacco shreds, characterized in that: It includes: tobacco inlet (N1), tobacco outlet (N2), compressed air inlet (H1), compressed air outlet (H2), tobacco vibration conveying device (1), feeding port (2), vertical feeding pipe (3), feeding air lock (4), inclined feeding pipe (5), vertical air inlet pipe (6), vertical conveying pipe (7), curved pipe (8), horizontal transparent conveying pipe (9), image recognition system I (11), image recognition system II (18), gas-solid separation device (20), exhaust pipe (21), vertical discharge pipe (22), discharge air lock (23) and discharge port (24); The tobacco inlet (N1) is located at the upstream end of the tobacco vibrating conveying device (1); the tobacco outlet (N2) is located at the downstream end of the tobacco vibrating conveying device (1); the compressed air inlet (H1) is located at the bottom end of the vertical air inlet pipe (6); and the compressed air outlet (H2) is located at the top end of the exhaust pipe (21); The feeding port (2) is located upstream of the tobacco vibrating conveying device (1) and is connected to the tobacco vibrating conveying device (1); the vertical feeding pipe (3) is located below the feeding port (2) and is connected to the feeding port (2); the feeding air lock (4) is arranged in the vertical feeding pipe (3) to adjust the flow rate of tobacco material and prevent compressed air from overflowing upward along the vertical feeding pipe (3); the inclined feeding pipe (5) is located below the vertical feeding pipe (3) and is connected to the vertical feeding pipe (3); the inclined feeding pipe (5) is connected to the bottom of the vertical conveying pipe (7); the vertical air inlet pipe (6) is located at the bottom end of the vertical conveying pipe (7) and is connected to the vertical conveying pipe (7); The top end of the vertical conveying pipe (7) is connected to the curved pipe (8); the downstream end of the curved pipe (8) is connected to the horizontal transparent conveying pipe (9); an image recognition system I (11) and an image recognition system II (18) for real-time recognition of the stem content in the shredded tobacco are arranged above and below the horizontal transparent conveying pipe (9), respectively; The downstream end of the horizontal transparent conveying pipe (9) is connected to the gas-solid separation device (20); the top of the gas-solid separation device (20) is connected to the exhaust pipe (21); the bottom of the gas-solid separation device (20) is connected to the vertical drop pipe (22); the discharge air lock (23) is arranged in the vertical drop pipe (22) to ensure that the tobacco material falls evenly and prevent the compressed air from overflowing downward along the vertical drop pipe (22); the bottom of the vertical drop pipe (22) is connected to the drop port (24); the drop port (24) is located above and downstream of the tobacco vibration conveying device (1); The shredded tobacco entering the shredded tobacco vibrating conveying device (1) is one or more of leaf shredded tobacco, stem shredded tobacco, and finished shredded tobacco, and the material flow rate is 1000-3000 kg / h.

2. The on-line detection device for stem content in shredded tobacco according to claim 1, characterized in that: The image recognition system I (11) comprises a light source I (13), an image acquisition camera I (14), a data information connection line I (12) and a computer I (10), and the image recognition system II (18) comprises an image acquisition camera II (15), a light source II (16), a data information connection line II (17) and a computer II (19).

3. The on-line detection device for stem content in tobacco according to claim 1, characterized in that: The wind speed of the compressed air entering the vertical conveying pipe (7) from the vertical air inlet pipe (6) is 15 to 18 m / s.

4. The on-line detection device for stem content in tobacco according to claim 1, characterized in that: The detection frequency range of the image recognition system I (11) and the image recognition system II (18) is 1 to 20 seconds.

5. A method for online control of stem content in cigarettes, characterized in that: The use of the on-line detection device for stem content in tobacco shreds according to claim 1 specifically comprises the following two steps: Step 1: Detection of stem content in finished tobacco After the finished tobacco leaves the cabinet and before the finished tobacco is transported to the cigarette making machine for rolling, the online detection device for the content of stems in tobacco according to claim 1 is used to detect the proportion of stems with a width greater than 1.0 mm and a length greater than 3.0 mm in the finished tobacco, that is, stems / 100 tobaccos; Step 2: Online control of the stem content in cigarettes In the rolling process, based on the proportion of stems with a width greater than 1.0mm and a length greater than 3.0mm in the finished tobacco detected in step one and the lag time of the finished tobacco being transported to the rolling process, combined with the control level of the stem content in the cigarettes, the wind speed of the feed air pipe on the cigarette making machine is adjusted online.

6. The method for online controlling the stem content in a cigarette according to claim 5, characterized in that: The specific method of step 2 is as follows: The stem content in cigarettes needs to be controlled to ≤3%. The wind speed of the feed air distribution pipe on the cigarette making machine is regulated as follows: (1) When the proportion of stems with a width greater than 1.0 mm and a length greater than 3.0 mm in the finished tobacco is ≤ 5 stems / 100 tobacco stems, the wind speed of the feed air distribution pipe on the cigarette making machine is controlled to 5.0 m / s; (2) When the proportion of stems with a width greater than 1.0 mm and a length greater than 3.0 mm in the finished tobacco is in the range of 5 stems / 100 tobacco stems to 8 stems / 100 tobacco stems, the wind speed of the feed air distribution pipe on the cigarette making machine is controlled to be 4.0 m / s; (3) When the proportion of stems with a width greater than 1.0 mm and a length greater than 3.0 mm in the finished tobacco is ≥ 8 stems / 100 tobacco stems, the wind speed of the feed air distribution pipe on the cigarette making machine is controlled to 3.0 m / s.

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