Device and method for removing stems in cigarette making process

Abstract

The present invention discloses a device for removing stems in a cigarette shred process, characterized in that it comprises a tobacco shred feeding unit (N1), a flexible air selection unit (N2), a pure tobacco shred collecting unit (N3), a tobacco shred conveying unit containing stems (N4), a thick stem removal unit (N5), and a thin stem removal unit (N6). The present invention also discloses a method for removing stems in a cigarette shred process using the device for removing stems. The device of the present invention can achieve the effect of efficiently removing stems.

Description

Technical Field

[0001] The invention belongs to the technical field of tobacco processing technology, and in particular relates to a device and a method for removing stems in a cigarette shred making process. Background Art

[0002] Stem sticks are foreign objects in tobacco that are inevitably produced after the tobacco leaves and stems are cut into shreds during the cigarette-making process. Stem sticks can cause great harm to the subsequent rolling process and the final cigarette product, and must be removed before the tobacco is rolled into cigarette products.

[0003] According to the size of the stem sticks, they can be divided into thin stem sticks (width not more than 0.7mm or length not more than 1.0mm) and thick stem sticks (width greater than 0.7mm or length greater than 1.0mm). The thick stem sticks have a large difference in density properties from tobacco shreds, and can basically be removed using the traditional wind flotation principle; while the difference in density properties between thin stem sticks and tobacco shreds is relatively small, and it is difficult to achieve indicators such as ensuring the stem stick rejection rate while reducing the tobacco shred misrejection rate when removing them using the traditional wind flotation principle. That is, while the rejection rate of thin stem sticks is increased, the tobacco content of the rejected stem sticks is also higher, resulting in excessive tobacco consumption.

[0004] At present, domestic cigarette companies basically use flexible wind separation to remove tobacco stems on the tobacco-making line. There are common problems such as high tobacco consumption, poor removal of thin stems, and large water loss in tobacco. As a result, stem removal or control has become a difficult and painful point that cigarette companies need to solve urgently.

[0005] In order to solve the above-mentioned problems, the present invention is proposed. Summary of the invention

[0006] Stem removal is an important step in the tobacco shred processing. How to effectively and comprehensively remove stems from tobacco shreds is of great practical significance for improving the purity of tobacco shreds and stabilizing the quality of cigarette products. The purpose of the present invention is to address the deficiencies of the prior art and provide a device for removing stems from the tobacco shred process and an operating method thereof, which can effectively remove all stems from the tobacco shred process, significantly improve the purity and quality of tobacco shreds, and at the same time can adapt to large-scale production of tobacco shred production lines, and has good application prospects and practical significance.

[0007] The purpose of the present invention is achieved through the following technical solutions.

[0008] The first aspect of the present invention discloses a device for removing stems in a cigarette making process, which comprises a tobacco feeding unit N1, a flexible air selection unit N2, a pure tobacco collection unit N3, a tobacco conveying unit N4 containing stems, a thick stem removal unit N5, and a thin stem removal unit N6;

[0009] The shredded tobacco feeding unit N1 is located in the center of the stem removal device, with the flexible air selection unit N2 on the left, the thick stem removal unit N5 on the right, the thin stem removal unit N6 on the top, and the stem tobacco feed port of the stem tobacco conveying unit N4 on the bottom; the shredded tobacco feeding unit N1 is used to vibrate and convey the incoming shredded tobacco and the shredded tobacco after the stems are removed, and convey the shredded tobacco to the flexible air selection unit N2 on the left for a flexible air selection process;

[0010] The flexible air selection unit N2 is in the shape of a rectangular box, the pure tobacco collection unit N3 is located at its lower left bottom, and the stem-containing tobacco dropping device 32 of the stem-containing tobacco conveying unit N4 is located at its lower right bottom. The flexible air selection unit N2 is used to air-select and separate the tobacco in the conveying process of the tobacco feeding unit N1, and convey the separated pure tobacco to the pure tobacco collection unit N3 for collection, and convey the separated tobacco and stem-containing mixture to the stem-containing tobacco conveying unit N4 for further conveying; the pure tobacco collection unit N3 is used to collect pure tobacco; the stem-containing tobacco conveying unit N4 is used to pneumatically convey the stem-containing tobacco separated by the flexible air selection unit N2 to the coarse stem removal unit N5 for coarse stem removal; the fine stem removal unit N6 is used to perform image recognition and precise blowing removal of fine stems in the tobacco, and convey the tobacco after the fine stems are removed to the tobacco feeding unit N1 for a cyclic stem removal process;

[0011] The movement order of tobacco in each unit is as follows: the raw tobacco enters the pure tobacco collecting unit N3 after passing through the tobacco feeding unit N1 and the flexible air selection unit N2 to be collected; the remaining tobacco containing stems enters the tobacco containing stems conveying unit N4, then enters the thick stem removal unit N5 and the thin stem removal unit N6 for stem removal, then enters the flexible air selection unit N2 and enters the pure tobacco collecting unit N3 to be collected.

[0012] Preferably,

[0013] The tobacco feeding unit N1 comprises: a vibrating conveying feeding device 20 and a funnel feeding device 21 arranged at the upper right part thereof; the vibrating conveying feeding device 20 is arranged from right to left and obliquely upward to extend to the flexible air separation box 22; a connection port 221 between the tobacco feeding unit N1 and the flexible air separation box 22 is at the lower right part of the wall of the box of the flexible air separation unit N2;

[0014] The flexible air separation unit N2 includes a flexible air separation box 22, a baffle 23, a dust removal device 24 and a vibration conveying and discharging device 27, wherein the baffle 23 is arranged in the middle of the top inner wall of the flexible air separation box 22 and in the upper left of the connection port 221; the dust removal device 24 is arranged in the upper left top of the flexible air separation box 22, and extends the exhaust port 26 into the flexible air separation box 22 through the exhaust pipe 25; the vibration conveying and discharging device 27 is arranged between the clean tobacco collection unit N3 and the stemmed tobacco conveying unit N4 at the bottom of the flexible air separation box 22, and is arranged from right to left and upward; the left end of the vibration conveying and discharging device 27 is connected to the clean tobacco discharging pipe 28 and then connected to the clean tobacco collection unit N3 through the clean tobacco discharging air lock 29, and the right end is attached to the lower and middle part outside the mouth of the stemmed tobacco dropping device 32;

[0015] The clean tobacco collecting unit N3 comprises the clean tobacco collecting device 30, and the clean tobacco collecting device 30 is connected to the clean tobacco discharging pipe 28 via the clean tobacco discharging air lock 29;

[0016] The stem-containing tobacco shreds conveying unit N4 comprises a horizontally arranged stem-containing tobacco shreds conveying pipe 34; the stem-containing tobacco shreds conveying pipe 34 is tubular, and the upper wall of the left end thereof is connected to the stem-containing tobacco shreds blanking device 32 through the stem-containing tobacco shreds blanking air lock 33; the left end of the stem-containing tobacco shreds conveying pipe 34 is a pneumatic conveying inlet 31 connected to a positive pressure wind generating device;

[0017] The thick stem removal unit N5 comprises a vertically arranged air selection device 4, a lifting pipe 5 and a thick stem drop barrel 3; the lifting pipe 5 is trumpet-shaped; the air selection device 4 is cylindrical, the upper end of which is connected to the large end of the lifting pipe 5, and the lower end of which is connected to the thick stem drop barrel 3; the thick stem drop barrel 3 is connected to the thick stem discharge pipe 1 through the thick stem discharge air lock 2; the right end of the stem tobacco delivery pipe 34 is bent upward by 90°, and its right end is connected to the middle and lower part of the side wall of the air selection device 4;

[0018] The thin stalk removal unit N6 includes a transverse pneumatic conveying square tube 6, an image recognition system 7, a thin stalk rejection system 10, a thin stalk blanking barrel 14 and a cyclone separator 17; the transverse pneumatic conveying square tube 6 is a transparent square tube and is arranged horizontally; the image recognition system 7 includes an image acquisition camera 8 and a light source 9; the thin stalk rejection system 10 includes a compressed air blowing pipe 11, a high-speed solenoid valve 12 and a detection and recognition signal servo controller 13; the image recognition system 7 is closely arranged upstream of the thin stalk rejection system 10, and both are located above the transverse pneumatic conveying square tube 6; the thin stalk blanking barrel 14 is located below the transverse pneumatic conveying square tube 6 and the upper port is connected to the transverse pneumatic conveying square tube 6, and the lower end is connected to the transverse pneumatic conveying square tube 6. The cyclone separator 17 is placed vertically, and its lower port is connected to the vibrating conveying feeding device 20 through the purified tobacco discharge air lock 19, and its upper port is connected to the exhaust pipe 18; the exhaust pipe 18 is bent 180° and connected to the wall between the connecting port 221 on the right side of the flexible air separation box 22 and the tobacco stem discharge device 32, and the exhaust pipe port 181 is inclined to the upper left; the right port of the transverse pneumatic conveying square tube 6 is connected to the upper port of the lifting tube 5, and the left port of the transverse pneumatic conveying square tube 6 is connected to the wall in the upper middle part of the cyclone separator 17;

[0019] Preferably, the baffle 23 is adjustable in the left-right direction to adjust the wind direction in the flexible air selection process.

[0020] Preferably, the shredded tobacco from which stems are removed during the cigarette making process is one or more of shredded tobacco, shredded stems, finished shredded tobacco, etc. on the cigarette making production line.

[0021] Preferably, the velocity of the positive pressure wind entering the stemmed tobacco conveying pipe 34 from the pneumatic conveying inlet 31 is in the range of 8.0 m / s to 15.0 m / s.

[0022] Preferably, the velocity of the positive pressure wind entering the air selection device 4 from the stemmed tobacco conveying pipe 34 is in the range of 2.0 m / s to 6.0 m / s.

[0023] Preferably, the velocity range of the positive pressure wind entering the transverse pneumatic conveying square tube 6 from the lifting pipe 5 is 13.0 m / s to 23.0 m / s.

[0024] The second aspect of the present invention discloses a method for removing stems in a cigarette making process, using the above-mentioned device for removing stems, wherein the movement trajectory of the positive pressure wind in the device for removing stems is as follows: the positive pressure wind enters the tobacco conveying pipe 34 containing stems through the pneumatic conveying inlet 31, then flows to the right along the tobacco conveying pipe 34 containing stems into the air selection device 4, then moves upward along the air selection device 4, enters the transverse pneumatic conveying square tube 6 upward through the lifting pipe 5, then continues to move to the left along the transverse pneumatic conveying square tube 6 into the cyclone separator 17, then enters the flexible air selection box 22 through the exhaust pipe port 181 along the exhaust pipe 18, moves to the upper left in the flexible air selection box 22, then enters the exhaust port 26, and is discharged through the exhaust pipe 25 and the dust removal device 24;

[0025] The method for removing stems during cigarette making comprises the following steps:

[0026] The raw tobacco shreds fall from the hopper feeding device 21 onto the vibrating conveying feeding device 20, and enter the flexible air separation box 22 during the process of the vibrating conveying feeding device 20 vibrating and conveying obliquely upward from right to left. Due to the effects of the oblique upward positive pressure wind entering the flexible air separation box 22 through the exhaust pipe 18 and its own gravity, the raw tobacco shreds are fully loosened and separated into two parts: a majority of pure tobacco shreds and a small portion of a mixture of tobacco shreds and stems. The pure tobacco shreds move to the left in the flexible air separation box 22, and due to the effect of its own weight, they fall onto the vibrating conveying discharging device 27, and are then conveyed to the pure tobacco discharging pipe 28, and finally discharged and collected through the pure tobacco discharging air lock 29 and the pure tobacco collecting device 30.

[0027] A small portion of the mixture of shredded tobacco and stems separated by the flexible air separation box 22 falls into the shredded tobacco containing stems 32 due to its own weight, and enters the shredded tobacco conveying pipe 34 containing stems through the shredded tobacco containing stems air lock 33; due to the effect of the positive pressure wind entering from the pneumatic conveying inlet 31, the shredded tobacco and stems mixture moves to the right along the shredded tobacco conveying pipe 34 containing stems and enters the vertical air separation device 4, and under the combined effect of the vertical upward wind force and its own weight, the shredded tobacco and stems mixture is fully and loosely separated into two parts: coarse stems and a mixture of shredded tobacco and fine stems, wherein the coarse stems fall to the bottom of the vertical air separation device 4 and are discharged through the coarse stems dropping barrel 3, the coarse stems discharge air lock 2 and the coarse stems discharge pipe 1;

[0028] The mixture of shredded tobacco and thin-stem picks moves toward the top of the vertical air separation device 4 under the action of positive wind, enters the horizontal pneumatic conveying square tube 6 through the lifting pipe 5 and moves to the left, and is identified as thin-stem picks and shredded tobacco by the image recognition system 7. The thin-stem picks are removed downward by the compressed air blowing pipe 11 below the thin-stem pick removal system 10 into the thin-stem pick dropping barrel 14, and then discharged through the thin-stem pick discharge air lock 15 and the thin-stem pick discharge pipe 16; while the shredded tobacco continues to move to the left along the horizontal pneumatic conveying square tube 6 and enters the cyclone separator 17. Under the action of gas-solid separation, the shredded tobacco falls into the bottom of the cyclone separator 17, and falls into the vibrating conveying feeding device 20 through the purified tobacco pick discharge air lock 19, completing the removal of coarse and thin-stem picks.

[0029] The present invention has the following beneficial effects compared with the prior art:

[0030] 1. The device for removing stem sticks of the present invention comprises core links such as a coarse stem stick removal unit and a fine stem stick removal unit, wherein the coarse stem sticks are removed by vertical air selection, and the fine stem sticks are removed by image recognition and precise nozzles, thereby achieving the removal of coarse stem sticks and fine stem sticks in turn, and being able to effectively remove all stem sticks in tobacco shreds, and being able to effectively solve the problems that need to be solved urgently, such as poor stem stick removal effect and high tobacco consumption in the stem stick removal process, which exist in the current flexible air selection separation method used by cigarette companies.

[0031] 2. The device for removing stems of the present invention is designed with a flexible air separation unit before removing the stems, which makes full use of the difference in density properties between stems and tobacco to separate most of the pure tobacco from a small part of the mixture of tobacco and stems, which can significantly increase the tobacco processing capacity and reduce the damage to most of the tobacco in the process of stem removal, thereby being able to adapt to large-scale production of cigarette silk production lines.

[0032] 3. The device for removing stems of the present invention is designed to return the purified shredded tobacco processed by the coarse stem removal unit and the fine stem removal unit to the shredded tobacco feeding unit, so that the stems that have not been removed are further circulated and removed, which can achieve the effect of efficiently removing stems, thereby significantly improving the use value of shredded tobacco and stabilizing the quality of cigarette products.

[0033] 4. The device for removing stems of the present invention has a simple structure and a practical method, and can be applied to the removal of other impurities in tobacco, and has good application prospects and promotion and application value. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative work.

[0035] Figure 1 It is a schematic diagram of the overall structure of a device for removing stems in the cigarette making process of the present invention.

[0036] Explanation of reference numerals: N1-cut tobacco feeding unit; N2-flexible air selection unit; N3-pure cut tobacco collecting unit; N4-stem-containing tobacco conveying unit; N5-coarse stem removal unit; N6-thin stem removal unit; 1-coarse stem discharge pipe; 2-coarse stem discharge air lock; 3-coarse stem discharge barrel; 4-air selection device; 5-lifting pipe; 6-lateral pneumatic conveying square pipe; 7-image recognition system; 8-image acquisition camera; 9-light source; 10-thin stem removal system; 11-compressed air blowing pipe; 12-high-speed solenoid valve; 13-detection and recognition signal servo controller; 14-thin stem discharge barrel; 15-thin stem discharge Material air lock; 16-thin-stem tobacco discharge pipe; 17-cyclone separator; 18-exhaust pipe; 181-exhaust pipe outlet; 19-purified tobacco discharge air lock; 20-vibration conveying feeding device; 21-funnel feeding device; 22-flexible air separation box; 221-connecting port; 23-baffle; 24-dust removal device; 25-exhaust pipe; 26-exhaust outlet; 27-vibration conveying discharge device; 28-pure tobacco discharge pipe; 29-pure tobacco discharge air lock; 30-pure tobacco collecting device; 31-pneumatic conveying inlet; 32-stem tobacco dropping device; 33-stem tobacco dropping air lock; 34-stem tobacco delivery pipe. DETAILED DESCRIPTION

[0037] The present invention is further described below in conjunction with the accompanying drawings and embodiments, but the accompanying drawings and embodiments are not intended to limit the technical solution of the present invention. Any changes or improvements made based on the teachings of the present invention fall within the protection scope of the present invention.

[0038] The words indicating directions such as “center”, “left side”, “right side”, “upper part” and “lower part” in the present invention are intended to clearly explain the technical solution of the present invention, rather than to limit the present invention.

[0039] like Figure 1 As shown, a device for removing stems in the process of making cigarette shreds includes a shredded tobacco feeding unit N1, a flexible air selection unit N2, a pure shredded tobacco collecting unit N3, a shredded tobacco conveying unit N4, a thick shredded tobacco removing unit N5, and a thin shredded tobacco removing unit N6;

[0040] The shredded tobacco feeding unit N1 is located in the center of the stem removal device, with the flexible air selection unit N2 on the left, the thick stem removal unit N5 on the right, the thin stem removal unit N6 on the top, and the stem tobacco feed port of the stem tobacco conveying unit N4 on the bottom; the shredded tobacco feeding unit N1 is used to vibrate and convey the incoming shredded tobacco and the shredded tobacco after the stems are removed, and convey the shredded tobacco to the flexible air selection unit N2 on the left for a flexible air selection process;

[0041] The flexible air selection unit N2 is in the shape of a rectangular box, the pure tobacco collection unit N3 is located at its lower left bottom, and the stem-containing tobacco dropping device 32 of the stem-containing tobacco conveying unit N4 is located at its lower right bottom. The flexible air selection unit N2 is used to air-select and separate the tobacco in the conveying process of the tobacco feeding unit N1, and convey the separated pure tobacco to the pure tobacco collection unit N3 for collection, and convey the separated tobacco and stem-containing mixture to the stem-containing tobacco conveying unit N4 for further conveying; the pure tobacco collection unit N3 is used to collect pure tobacco; the stem-containing tobacco conveying unit N4 is used to pneumatically convey the stem-containing tobacco separated by the flexible air selection unit N2 to the coarse stem removal unit N5 for coarse stem removal; the fine stem removal unit N6 is used to perform image recognition and precise blowing removal of fine stems in the tobacco, and convey the tobacco after the fine stems are removed to the tobacco feeding unit N1 for a cyclic stem removal process;

[0042] The movement order of tobacco in each unit is as follows: the raw tobacco enters the pure tobacco collecting unit N3 after passing through the tobacco feeding unit N1 and the flexible air selection unit N2 to be collected; the remaining tobacco containing stems enters the tobacco containing stems conveying unit N4, then enters the thick stem removal unit N5 and the thin stem removal unit N6 for stem removal, then enters the flexible air selection unit N2 and enters the pure tobacco collecting unit N3 to be collected.

[0043] The tobacco feeding unit N1 includes: a vibrating conveying feeding device 20 and a funnel feeding device 21 arranged at the upper right part thereof; the vibrating conveying feeding device 20 is arranged from right to left and obliquely upward to extend to the flexible air separation box 22; the connection port 221 between the tobacco feeding unit N1 and the flexible air separation box 22 is at the lower right part of the wall of the box of the flexible air separation unit N2;

[0044] The flexible air separation unit N2 includes a flexible air separation box 22, a baffle 23, a dust removal device 24 and a vibration conveying and discharging device 27, wherein the baffle 23 is arranged in the middle of the top inner wall of the flexible air separation box 22 and in the upper left of the connection port 221; the dust removal device 24 is arranged in the upper left top of the flexible air separation box 22, and extends the exhaust port 26 into the flexible air separation box 22 through the exhaust pipe 25; the vibration conveying and discharging device 27 is arranged between the clean tobacco collection unit N3 and the stemmed tobacco conveying unit N4 at the bottom of the flexible air separation box 22, and is arranged from right to left and upward; the left end of the vibration conveying and discharging device 27 is connected to the clean tobacco discharging pipe 28 and then connected to the clean tobacco collection unit N3 through the clean tobacco discharging air lock 29, and the right end is attached to the lower and middle part outside the mouth of the stemmed tobacco dropping device 32;

[0045] The clean tobacco collecting unit N3 comprises the clean tobacco collecting device 30, and the clean tobacco collecting device 30 is connected to the clean tobacco discharging pipe 28 via the clean tobacco discharging air lock 29;

[0046] The stem-containing tobacco shreds conveying unit N4 comprises a horizontally arranged stem-containing tobacco shreds conveying pipe 34; the stem-containing tobacco shreds conveying pipe 34 is tubular, and the upper wall of the left end thereof is connected to the stem-containing tobacco shreds blanking device 32 through the stem-containing tobacco shreds blanking air lock 33; the left end of the stem-containing tobacco shreds conveying pipe 34 is a pneumatic conveying inlet 31 connected to a positive pressure wind generating device;

[0047] The thick stem removal unit N5 comprises a vertically arranged air selection device 4, a lifting pipe 5 and a thick stem drop barrel 3; the lifting pipe 5 is trumpet-shaped; the air selection device 4 is cylindrical, the upper end of which is connected to the large end of the lifting pipe 5, and the lower end of which is connected to the thick stem drop barrel 3; the thick stem drop barrel 3 is connected to the thick stem discharge pipe 1 through the thick stem discharge air lock 2; the right end of the stem tobacco delivery pipe 34 is bent upward by 90°, and its right end is connected to the middle and lower part of the side wall of the air selection device 4;

[0048] The thin stalk removal unit N6 includes a transverse pneumatic conveying square tube 6, an image recognition system 7, a thin stalk rejection system 10, a thin stalk blanking barrel 14 and a cyclone separator 17; the transverse pneumatic conveying square tube 6 is a transparent square tube and is arranged horizontally; the image recognition system 7 includes an image acquisition camera 8 and a light source 9; the thin stalk rejection system 10 includes a compressed air blowing pipe 11, a high-speed solenoid valve 12 and a detection and recognition signal servo controller 13; the image recognition system 7 is closely arranged upstream of the thin stalk rejection system 10, and both are located above the transverse pneumatic conveying square tube 6; the thin stalk blanking barrel 14 is located below the transverse pneumatic conveying square tube 6 and the upper port is connected to the transverse pneumatic conveying square tube 6, and the lower end is connected to the transverse pneumatic conveying square tube 6. The cyclone separator 17 is placed vertically, and its lower port is connected to the vibrating conveying feeding device 20 through the purified tobacco discharge air lock 19, and its upper port is connected to the exhaust pipe 18; the exhaust pipe 18 is bent 180° and connected to the wall between the connecting port 221 on the right side of the flexible air separation box 22 and the tobacco stem discharge device 32, and the exhaust pipe port 181 is inclined to the upper left; the right port of the transverse pneumatic conveying square tube 6 is connected to the upper port of the lifting tube 5, and the left port of the transverse pneumatic conveying square tube 6 is connected to the wall in the upper middle part of the cyclone separator 17;

[0049] The baffle 23 is adjustable in the left-right direction to adjust the wind direction in the flexible air selection process.

[0050] Among them, the tobacco with stems removed during the cigarette making process is one or more of the tobacco, stems, finished tobacco, etc. on the cigarette making production line.

[0051] The velocity of the positive pressure wind entering the stemmed tobacco conveying pipe 34 from the pneumatic conveying inlet 31 is in the range of 8.0 m / s to 15.0 m / s, and in this embodiment is 13.0 m / s.

[0052] The velocity of the positive pressure wind entering the air selection device 4 from the stemmed tobacco delivery pipe 34 is in the range of 2.0 m / s to 6.0 m / s, and is 3.0 m / s in this embodiment.

[0053] The velocity of the positive pressure wind entering the transverse pneumatic conveying square tube 6 from the lifting pipe 5 is in the range of 13.0 m / s to 23.0 m / s, and in this embodiment is 17.0 m / s.

[0054] The movement trajectory of the positive pressure wind in the device for removing stems is as follows: the positive pressure wind enters the tobacco conveying pipe 34 containing stems through the pneumatic conveying inlet 31, then flows to the right along the tobacco conveying pipe 34 containing stems to enter the air selection device 4, then moves upward along the air selection device 4, passes through the lifting pipe 5 and enters the transverse pneumatic conveying square pipe 6, then continues to move to the left along the transverse pneumatic conveying square pipe 6 and enters the cyclone separator 17, then enters the flexible air selection box 22 through the exhaust pipe port 181 along the exhaust pipe 18, moves to the upper left in the flexible air selection box 22, then enters the exhaust port 26, and is discharged through the exhaust pipe 25 and the dust removal device 24;

[0055] The method for removing stems in the cigarette making process using the stem removal device of the present invention comprises the following steps:

[0056] The raw tobacco shreds fall from the hopper feeding device 21 onto the vibrating conveying feeding device 20, and enter the flexible air separation box 22 during the process of the vibrating conveying feeding device 20 vibrating and conveying obliquely upward from right to left. Due to the effects of the oblique upward positive pressure wind entering the flexible air separation box 22 through the exhaust pipe 18 and its own gravity, the raw tobacco shreds are fully loosened and separated into two parts: a majority of pure tobacco shreds and a small portion of a mixture of tobacco shreds and stems. The pure tobacco shreds move to the left in the flexible air separation box 22, and due to the effect of its own weight, they fall onto the vibrating conveying discharging device 27, and are then conveyed to the pure tobacco discharging pipe 28, and finally discharged and collected through the pure tobacco discharging air lock 29 and the pure tobacco collecting device 30.

[0057] A small portion of the mixture of shredded tobacco and stems separated by the flexible air separation box 22 falls into the shredded tobacco containing stems 32 due to its own weight, and enters the shredded tobacco conveying pipe 34 containing stems through the shredded tobacco containing stems air lock 33; due to the effect of the positive pressure wind entering from the pneumatic conveying inlet 31, the shredded tobacco and stems mixture moves to the right along the shredded tobacco conveying pipe 34 containing stems and enters the vertical air separation device 4, and under the combined effect of the vertical upward wind force and its own weight, the shredded tobacco and stems mixture is fully and loosely separated into two parts: coarse stems and a mixture of shredded tobacco and fine stems, wherein the coarse stems fall to the bottom of the vertical air separation device 4 and are discharged through the coarse stems dropping barrel 3, the coarse stems discharge air lock 2 and the coarse stems discharge pipe 1;

[0058] The mixture of shredded tobacco and thin stems moves toward the top of the vertical air selection device 4 under the action of positive wind, enters the horizontal pneumatic conveying square tube 6 through the lifting tube 5 and moves to the left, and is identified as thin stems and shredded tobacco by the image recognition system 7. The thin stems are removed downward into the thin stem drop barrel 14 by the compressed air blowing tube 11 below the thin stem removal system 10, and then discharged through the thin stem discharge air lock 15 and the thin stem discharge tube 16; while the shredded tobacco continues to move to the left along the horizontal pneumatic conveying square tube 6 and enters the cyclone separator 17. Under the action of gas-solid separation, the shredded tobacco falls to the bottom of the cyclone separator 17, and falls into the vibrating conveying feeding device 20 through the purified shredded tobacco discharge air lock 19, completing the removal of coarse stems and thin stems. The shredded tobacco with stems removed during the cigarette making process is the shredded tobacco after the leaf shreds are dried in the key process of cigarette making.

[0059] This example uses 3000 kg of tobacco shreds from a certain cigarette brand's key tobacco-making process after drying, wherein the stem content of the tobacco shreds is 7.12% (measured using an SST-2 tobacco shreds stem content tester).

[0060] The above-mentioned tobacco was divided into two equal parts, each weighing 1500 kg; the tobacco was subjected to stem removal treatments using the device for removing stems of the present invention and the current FS417A type leaf flexible on-site air separator for tobacco production line, respectively, and the results are shown in Table 1. The stem content in the tobacco after the two treatments was detected using an SST-2 type tobacco stem content tester, and the mass of the removed stems was weighed using an electronic balance, and the formula for calculating the effective stem removal rate was (stem content in tobacco before treatment - stem content in tobacco after treatment) / stem content in tobacco before treatment × 100%.

[0061] Table 1 Comparison of the effects of removing stems and sticks by the present invention and the FS417A type leaf silk flexible on-site wind separator for silk thread making

[0062] Processing Mass of stems removed (kg) Stem content in processed tobacco Effective removal rate of stems FS417A Flexible Air Separator 41.10 4.38％ 38.48％ The present invention 100.05 0.45％ 93.68％

[0063] As shown in Table 1, compared with the existing FS417A type flexible on-site wind separator for tobacco shreds, the device for removing stems of the present invention has a better effect of removing stems from tobacco shreds under the same conditions, and the effective removal rate of stems reaches 93.68%; the content of stems in the tobacco shreds after treatment is low, only 0.45%. This shows that the device for removing stems of the present invention can efficiently remove stems from the process of making tobacco shreds, significantly reduce the harm of stems to the subsequent tobacco shreds rolling process and the quality of the final cigarette products, and thus improve and stabilize the quality of cigarette products.

[0064] The above description is only used to introduce the specific implementation methods of the present invention in detail, but the technical solution proposed by the present invention is not limited to the above method. Without departing from the basic principles of the present technology, equivalent modifications and changes made by those skilled in the art to the technology proposed by the present invention should be included in the scope of the claims of the present invention.

Claims

1. A device for removing stems in a cigarette making process, characterized in that: It includes a tobacco feeding unit, a flexible air selection unit, a pure tobacco collection unit, a tobacco conveying unit containing stems, a thick stem removal unit, and a thin stem removal unit; The tobacco feeding unit is located in the center of the stem removal device, with a flexible air selection unit on the left, a thick stem removal unit on the right, a thin stem removal unit on the top, and a stem tobacco feeding port of the stem tobacco conveying unit on the bottom; The flexible air selection unit is in the shape of a rectangular box, the pure tobacco collection unit is located at the lower left bottom thereof, and the stemmed tobacco dropping device of the stemmed tobacco conveying unit is located at the lower right bottom thereof; The movement order of tobacco in each unit is as follows: the raw tobacco enters the pure tobacco collection unit after passing through the tobacco feeding unit and the flexible air selection unit; the remaining tobacco with stems enters the tobacco with stems conveying unit, then enters the thick stem removal unit and the thin stem removal unit for stem removal, then enters the flexible air selection unit and enters the pure tobacco collection unit for collection; The tobacco feeding unit comprises: a vibrating conveying feeding device and a funnel feeding device arranged at the upper right part thereof; the vibrating conveying feeding device is arranged from right to left and obliquely upward to extend to the flexible air separation box; the connection port between the tobacco feeding unit and the flexible air separation box is at the lower right part of the wall of the box body of the flexible air separation unit; The flexible air separation unit includes a flexible air separation box, a baffle, a dust removal device and a vibration conveying and discharging device, wherein the baffle is arranged in the middle of the top inner wall of the flexible air separation box and in the upper left of the connection port; the dust removal device is arranged in the upper left top of the flexible air separation box, and the exhaust port is extended into the flexible air separation box through the exhaust pipe; the vibration conveying and discharging device is arranged between the pure tobacco collection unit and the stemmed tobacco conveying unit at the bottom of the flexible air separation box, and is arranged from right to left and upward; the left end of the vibration conveying and discharging device is connected to the pure tobacco discharging pipe and then connected to the pure tobacco collection unit through the pure tobacco discharging air lock, and the right end is attached to the lower middle part outside the mouth of the stemmed tobacco dropping device; The pure tobacco collection unit comprises a pure tobacco collection device, which is connected to a pure tobacco discharge pipe via a pure tobacco discharge air lock; The stem-containing tobacco conveying unit comprises a horizontally arranged stem-containing tobacco conveying pipe; the stem-containing tobacco conveying pipe is tubular, and the upper wall of the left end thereof is connected to the stem-containing tobacco blanking device through a stem-containing tobacco blanking air lock; the left end of the stem-containing tobacco conveying pipe is a pneumatic conveying inlet connected to a positive pressure wind generating device; The thick stem removal unit includes a vertically arranged air selection device, a lifting pipe and a thick stem drop barrel; the lifting pipe is trumpet-shaped; the air selection device is cylindrical, the upper end of which is connected to the large end of the lifting pipe, and the lower end of which is connected to the thick stem drop barrel; the thick stem drop barrel is connected to the thick stem discharge pipe through a thick stem discharge air lock; the right end of the stem tobacco delivery pipe is bent upward by 90 degrees, and its right end is connected to the middle and lower part of the side wall of the air selection device; The thin stalk removal unit includes a transverse pneumatic conveying square tube, an image recognition system, a thin stalk rejection system, a thin stalk blanking barrel and a cyclone separator; the transverse pneumatic conveying square tube is a transparent square tube and is arranged horizontally; the image recognition system includes an image acquisition camera and a light source; the thin stalk rejection system includes a compressed air blowing tube, a high-speed solenoid valve and a detection and recognition signal servo controller; the image recognition system is closely arranged upstream of the thin stalk rejection system, and both are located above the transverse pneumatic conveying square tube; the thin stalk blanking barrel is located below the transverse pneumatic conveying square tube, and the upper port is connected to the transverse pneumatic conveying square tube. The lower end is connected with the fine stem discharge air lock and the fine stem discharge pipe in sequence, and the upper end of the fine stem discharge barrel is opposite to the fine stem removal system; the cyclone separator is placed vertically, and its lower end is connected to the vibrating conveying feeding device through the purified tobacco discharge air lock, and its upper end is connected to the exhaust pipe; the exhaust pipe is bent 180° and connected to the wall between the connecting port on the right side of the flexible air separation box and the stem tobacco discharge device, and the exhaust pipe mouth is inclined to the upper left; the right port of the horizontal pneumatic conveying square tube is connected to the upper port of the lifting pipe, and the left port of the horizontal pneumatic conveying square tube is through-connected to the wall in the upper middle part of the cyclone separator.

2. The stem removal device according to claim 1, characterized in that: The baffle is adjustable in left and right directions.

3. The stem removal device according to claim 1, characterized in that: The velocity range of the positive pressure wind entering the tobacco stem-containing shredded tobacco conveying pipe from the pneumatic conveying inlet is 8.0 m / s to 15.0 m / s.

4. The stem removal device according to claim 1, characterized in that: The velocity range of the positive pressure wind entering the air selection device from the tobacco stem conveying pipe is 2.0 m / s to 6.0 m / s.

5. The stem removal device according to claim 1, characterized in that: The positive pressure wind velocity range from the lifting pipe into the horizontal pneumatic conveying square pipe is 13.0 m / s to 23.0 m / s.

6. A method for removing stems in a cigarette making process, characterized in that: The stem removal device of claim 1 is used, wherein the movement trajectory of the positive pressure wind in the stem removal device is as follows: the positive pressure wind enters the stem-containing tobacco conveying pipe through the pneumatic conveying inlet, then flows to the right along the stem-containing tobacco conveying pipe into the air selection device, then moves upward along the air selection device, enters the transverse pneumatic conveying square pipe upward through the lifting pipe, then continues to move to the left along the transverse pneumatic conveying square pipe into the cyclone separator, then enters the flexible air selection box through the exhaust pipe port along the exhaust pipe, moves to the upper left in the flexible air selection box, then enters the exhaust port, and is discharged through the exhaust pipe and the dust removal device; The method for removing stems in the process of making cigarettes comprises the following steps: The raw tobacco shreds fall from the hopper feeding device onto the vibrating conveying feeding device, and enter the flexible air separation box during the process of the vibrating conveying feeding device vibrating and conveying obliquely upward from right to left. Due to the effects of the oblique upward positive pressure wind entering the flexible air separation box through the exhaust pipe and its own gravity, the raw tobacco shreds are fully loosened and separated into two parts: a majority of pure tobacco shreds and a small portion of a mixture of tobacco shreds and stems. The pure tobacco shreds move to the left in the flexible air separation box, and due to the effect of its own weight, they fall onto the vibrating conveying discharging device, and are then conveyed to the pure tobacco discharging pipe, and finally discharged and collected through the pure tobacco discharging air lock and the pure tobacco collecting device. A small portion of the mixture of shredded tobacco and stems separated by the flexible air separation box falls into the shredded tobacco dropping device containing stems due to its own weight, and enters the shredded tobacco conveying pipe containing stems through the shredded tobacco dropping air lock containing stems; due to the effect of the positive pressure wind entering from the pneumatic conveying inlet, the mixture of shredded tobacco and stems moves to the right along the shredded tobacco conveying pipe containing stems and enters the vertical air separation device, and under the combined effect of the vertical upward wind force and its own weight, the mixture of shredded tobacco and stems is fully and loosely separated into two parts: coarse stems and a mixture of shredded tobacco and fine stems, among which the coarse stems fall to the bottom of the vertical air separation device and are discharged through the coarse stem dropping barrel, the coarse stem discharge air lock and the coarse stem discharge pipe; The mixture of shredded tobacco and thin-stem picks moves toward the top of the vertical air separation device under the action of positive wind, enters the horizontal pneumatic conveying square tube through the lifting pipe and moves to the left, and is identified by the image recognition system as thin-stem picks and shredded tobacco. The thin-stem picks are removed downward into the thin-stem pick dropping barrel by the compressed air blowing pipe below the thin-stem pick removal system, and are then discharged through the thin-stem pick discharge air lock and the thin-stem pick discharge pipe; while the shredded tobacco continues to move to the left along the horizontal pneumatic conveying square tube and enters the cyclone separator. Under the action of gas-solid separation, the shredded tobacco falls to the bottom of the cyclone separator, and falls into the vibrating conveying feeding device through the purified tobacco discharge air lock, completing the removal of coarse and thin-stem picks.

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