A tobacco foreign body removal device and a tobacco foreign body removal method for a tobacco production line

Abstract

The present invention discloses a tobacco shred foreign matter removal device for a tobacco production line, comprising: a raw tobacco shred feeding and conveying unit (N1), a heavier foreign matter removal unit (N2), a tobacco shred loose recovery unit (N3), a moderate foreign matter removal unit (N4), a tobacco shred humidification unit (N5) and a lighter foreign matter removal unit (N6). The present invention also discloses a method for removing foreign matter using the tobacco shred foreign matter removal device for a tobacco production line. The device of the present invention can effectively remove foreign matter from tobacco shreds.

Description

Technical Field

[0001] The invention belongs to the technical field of tobacco processing technology, and in particular relates to a tobacco foreign matter removal device and a tobacco foreign matter removal method for a tobacco production line. Background Art

[0002] Foreign matters in tobacco during the cigarette making process mainly include stems (which can be further divided into thick stems and thin stems), clumped tobacco, metal, wood chips, plastic, paper, feathers, etc., which are quite different from tobacco in nature and will cause great harm to the subsequent rolling process and the final cigarette products. They need to be removed before tobacco is rolled into cigarette products. Compared with tobacco, foreign matters in tobacco can be divided into three categories based on density properties: heavier foreign matters, moderate foreign matters and lighter foreign matters. Among them, heavier foreign matters are foreign matters with a density greater than normal tobacco, such as metal shavings, wood chips, plastic particles, thick stems, clumped tobacco, and tobacco and heavier foreign matters entangled together; lighter foreign matters are foreign matters with a density less than normal tobacco, such as feathers and fine tobacco; moderate foreign matters are foreign matters with a density close to normal tobacco, such as thin stems.

[0003] Effectively removing foreign matter from tobacco in the process of making cigarettes is of great practical significance for improving the purity and use value of tobacco, and thus stabilizing the quality of cigarette products. At present, domestic cigarette companies basically use flexible air separation to remove foreign matter from tobacco on the tobacco production line. Although it has a certain effect on the removal of heavier and lighter foreign matter, it still has problems such as high tobacco loss (high tobacco content in the heavier foreign matter removed), poor tobacco foreign matter removal effect (moderate foreign matter cannot be effectively removed), and great impact on tobacco physical quality indicators (large water loss of tobacco). Effectively removing various foreign matter from tobacco and maintaining stable physical quality indicators of processed tobacco have become difficult problems that need to be solved urgently.

[0004] The present invention is proposed to solve the above-mentioned problems. Summary of the invention

[0005] The purpose of the present invention is to address the deficiencies of the prior art and provide a tobacco shred foreign matter removal device and an operation method thereof for a tobacco shred production line. The device of the present invention can effectively remove heavy foreign matter, medium foreign matter and light foreign matter from tobacco shreds, significantly improving the purity of tobacco shreds; at the same time, it can humidify tobacco shreds to compensate for the loss of moisture in tobacco shreds during the removal process, meet the requirements of tobacco shred moisture content index, and thus improve the quality of tobacco shreds and stabilize the quality of cigarette products.

[0006] The technical solution of the present invention is as follows:

[0007] The first aspect of the present invention discloses a tobacco foreign matter removal device for a tobacco production line, which comprises: a raw tobacco feeding and conveying unit N1, a heavier foreign matter removal unit N2, a tobacco loose recovery unit N3, a moderate foreign matter removal unit N4, a tobacco humidification unit N5 and a lighter foreign matter removal unit N6;

[0008] The raw tobacco feeding and conveying unit N1 is located upstream of the heavier foreign matter removal unit N2; the heavier foreign matter removal unit N2 is located above the tobacco loose recovery unit N3 and below the moderate foreign matter removal unit N4; the tobacco humidification unit N5 is located downstream of the moderate foreign matter removal unit N4; and the lighter foreign matter removal unit N6 is located downstream of the tobacco humidification unit N5.

[0009] Preferably, the raw tobacco feeding and conveying unit N1 comprises a horizontally placed pneumatic conveying pipe 2 and a raw tobacco feeding device 3, wherein the raw tobacco feeding device 3 is located above the pneumatic conveying pipe 2 and connected via a feed air lock 4, and one end of the pneumatic conveying pipe 2 is a pneumatic conveying inlet 1 connected to a positive pressure fan;

[0010] The heavier foreign matter removal unit N2 comprises a vertically arranged cylindrical heavier foreign matter air separation cylinder 5; the other end of the pneumatic conveying pipe 2 is connected to the wall of the middle and lower part of the heavier foreign matter air separation cylinder 5;

[0011] The tobacco loose recovery unit N3 includes a mechanical disintegration device 6, an inclined guide pipe 16, a positive pressure air delivery pipe 17, a tobacco wind selection and separation device 21 and a recovered tobacco conveying pipe 15; the inclined guide pipe 16 is tilted, and its lower end is connected to the discharge port of the mechanical disintegration device 6 and the inlet of the positive pressure air delivery pipe 17, and its upper end is connected to the feed port of the wind selection and separation device 21; one end of the positive pressure air delivery pipe 17 is connected to a positive pressure fan; the discharge port of the wind selection and separation device 21 is connected to one end of the recovered tobacco conveying pipe 15; the recovered tobacco conveying pipe 15 is tilted, and its other end is connected to the wall of the upper and middle part of the heavier foreign matter wind selection and separation cylinder 5; the lower part of the wind selection and separation device 21 is a heavier foreign matter discharge port 23, and the discharge port is provided with a heavier foreign matter discharge air lock 22; the mechanical disintegration device 6 is connected to the bottom barrel opening of the heavier foreign matter wind selection and separation cylinder 5;

[0012] The moderate foreign matter removal unit N4 includes a horizontally placed pneumatic conveying square tube 7, an image recognition system 8, a moderate foreign matter removal system 11, and a moderate foreign matter blanking barrel 18; wherein the image recognition system 8 includes an image acquisition camera 9 and a light source 10, and the moderate foreign matter removal system 11 includes a compressed air blowing pipe 12, a solenoid valve 13 and a detection and recognition signal servo controller 14; the pneumatic conveying square tube 7 is connected to the upper barrel opening of the heavier foreign matter air separation barrel 5; the image recognition system 8 is adjacent to the moderate foreign matter removal system 11 and the image recognition system 8 is adjacent to the moderate foreign matter removal system 11. The identification system 8 is arranged upstream of the moderate foreign body rejection system 11, and the image recognition system 8 and the moderate foreign body rejection system 11 are arranged above the transverse pneumatic conveying square tube 7; the moderate foreign body blanking barrel 18 is arranged below the transverse pneumatic conveying square tube 7 and opposite to the moderate foreign body rejection system 11; the moderate foreign body blanking barrel 18 is arranged vertically and its upper barrel opening is connected to the wall of the transverse pneumatic conveying square tube 7, and the lower barrel opening of the moderate foreign body blanking barrel 18 is a moderate foreign body discharge port 20, and the barrel opening is provided with a moderate foreign body discharge air lock 19;

[0013] The tobacco humidification unit N5 comprises a vertically arranged pneumatic conveying circular tube 24, a humidification nozzle 25 and a horizontal guide tube 26. The humidification nozzles 25 are multiple and symmetrically arranged on the inner wall of the pneumatic conveying circular tube 24. The bottom opening of the pneumatic conveying circular tube 24 is connected to the horizontal guide tube 26, and the upper opening thereof is connected to the outlet of the horizontally placed pneumatic conveying square tube 7.

[0014] The lighter foreign matter removal unit N6 includes a vertically arranged lighter foreign matter air separation cylinder 27; the upper port of the lighter foreign matter air separation cylinder 27 is connected to the horizontally arranged lighter foreign matter conveying pipe 30, and its bottom port is connected to the purified tobacco discharge air lock 28 and the purified tobacco collecting device 29; the other port of the lighter foreign matter conveying pipe 30 is connected to the lighter foreign matter collecting device 31; the discharge port of the horizontal guide pipe 25 is connected to the side wall of the middle and lower part of the lighter foreign matter air separation cylinder 26.

[0015] Preferably, the wind speed of the positive pressure wind entering the heavier foreign matter air separation cylinder 5 from the pneumatic conveying inlet 1 is in the range of 2.0 m / s to 8.0 m / s.

[0016] Preferably, the width of the transverse pneumatic conveying square tube 7 is 0.5m~2.0m, and the height of the square tube is 0.1m~0.5m; the transverse pneumatic conveying square tube 7 is made of transparent material such as organic glass or tempered glass, so as to perform image acquisition and identify foreign objects under the illumination of the light source 10.

[0017] Preferably, the wind speed of the positive pressure wind entering the air separation device 21 from the inclined guide pipe 16 is 2.0 m / s to 6.0 m / s.

[0018] Preferably, the wind speed of the positive pressure wind entering the lighter foreign matter air separation cylinder 27 from the horizontal guide pipe 26 is in the range of 0.5 m / s to 1.0 m / s.

[0019] The second aspect of the present invention discloses a method for removing foreign matter from tobacco in a tobacco production line, using the above-mentioned tobacco production line foreign matter removal device, including the steps of removing heavier foreign matter, removing moderate foreign matter, humidifying tobacco, and removing lighter foreign matter, which are specifically as follows:

[0020] Step 1: Removal of heavier foreign matter

[0021] The raw tobacco enters the pneumatic conveying pipe 2 through the raw tobacco feeding device 3 and the feed air lock 4, and enters the heavier foreign matter air separation cylinder 5 under the action of the positive pressure fan on the pneumatic conveying inlet 1. After entering the heavier foreign matter air separation cylinder 5, under the combined action of the vertical upward positive pressure wind force and the raw material's own gravity, the moderate and lighter foreign matter and tobacco enter the top of the heavier foreign matter air separation cylinder 5 and are conveyed to the horizontally placed pneumatic conveying square tube 7; while the heavier foreign matter with higher density falls downward into the mechanical disintegration device 6, and is mechanically disintegrated. After the device 6 is fully loosened, under the action of the positive pressure wind entering from the positive pressure air delivery pipe 17, it enters the air separation device 21 along the inclined guide pipe 16. After entering the air separation device 21, under the combined action of the vertical upward positive pressure wind and the weight of the material itself, the lighter part of the separated tobacco is returned along the recovered tobacco conveying pipe 15 to the heavier foreign matter air separation cylinder 5 and then conveyed to the horizontally placed pneumatic conveying square pipe 7. The separated heavier foreign matter is discharged through the heavier foreign matter discharge air lock 22 and the heavier foreign matter discharge port 23.

[0022] Step 2: Moderate foreign body removal

[0023] Step 1: Moderate and light foreign matter and shredded tobacco conveyed to the horizontally placed pneumatic conveying square tube 7 are identified as foreign matter in the shredded tobacco by the image recognition system 8 and removed by the moderate foreign matter removal system 11; the shredded tobacco with moderate foreign matter removed continues to move downstream along the horizontal pneumatic conveying square tube 7 and enters the vertically arranged pneumatic conveying circular tube 24; and the removed moderate foreign matter falls into the moderate foreign matter blanking barrel 18 and is discharged through the moderate foreign matter discharge air lock 19 and the moderate foreign matter discharge port 20;

[0024] Step 3: Humidification of tobacco

[0025] The tobacco shreds with moderate foreign matter removed from the vertically arranged pneumatic conveying circular tube 24 in step 2 are humidified by the water vapor sprayed by the humidifying nozzle 25 during the downward movement, and the humidified tobacco shreds are conveyed to the lighter foreign matter air separation cylinder 27 through the horizontal guide pipe 26;

[0026] Step 4: Removal of lighter foreign matter

[0027] In step three, the tobacco is conveyed to the lighter foreign matter air separation cylinder 27. Under the combined effect of the weak vertical upward positive pressure wind entering the lighter foreign matter air separation cylinder 27 and the material's own gravity, the humidified tobacco falls downward along the lighter foreign matter air separation cylinder 27, and enters the purified tobacco collecting device 29 through the purified tobacco discharge air lock 28, namely, the qualified purified tobacco; while the lighter foreign matter floats upward along the lighter foreign matter air separation cylinder 27, enters the lighter foreign matter collecting device 31 through the lighter foreign matter conveying pipe 30 and is then discharged.

[0028] The present invention has the following beneficial effects compared with the prior art:

[0029] 1. The tobacco foreign matter removal device of the tobacco production line of the present invention includes core links such as a heavier foreign matter removal unit, a medium foreign matter removal unit and a lighter foreign matter removal unit, wherein the heavier and lighter foreign matters are removed by air selection, and the medium foreign matters are removed by image recognition and precise blowing. It can achieve the removal of foreign matters with a density relatively heavier, medium and lighter than that of tobacco, and can effectively achieve the removal of all foreign matters in tobacco, thereby significantly improving the purity of tobacco, and improving the quality and use value of tobacco.

[0030] 2. The tobacco foreign matter removal device of the tobacco production line of the present invention accurately controls the wind conveying speed in each component. The present invention has found that when the positive pressure wind speed is greater than 2.5m / s, the buoyancy is greater than the gravity, and the tobacco is conveyed together with the positive pressure wind; when the positive pressure wind speed is less than 2.5m / s, the gravity is greater than the buoyancy, and the tobacco is not conveyed with the positive pressure wind but settles by gravity; when the positive pressure wind speed is greater than 8.0m / s, the heavier foreign matter in the tobacco cannot be effectively removed; when the wind speed range of the positive pressure wind is less than 1.0m / s, the lighter foreign matter can be effectively removed without affecting the normal settlement of the tobacco. Therefore, the present invention determines the range of the air separation wind speed, a key process parameter applicable to the air separation and impurity removal of tobacco materials.

[0031] 3. The tobacco foreign matter removal device of the tobacco production line of the present invention includes a tobacco loose recovery unit. For the tobacco in heavier foreign matters (clumped tobacco and part of the tobacco entangled with heavier foreign matters), mechanical breaking up and flexible air separation treatment are adopted to fully recover the tobacco therein, which can effectively reduce the tobacco loss in the process of removing heavier foreign matters and effectively improve the economic benefits.

[0032] 4. The tobacco foreign matter removal device of the tobacco production line of the present invention also includes a tobacco humidification unit, which adopts a symmetrical downward humidification method of the humidification nozzle, which can compensate for the loss of tobacco moisture content during the entire foreign matter removal process, meet the requirements of the subsequent rolling process for the tobacco moisture content index, improve the stability of the tobacco moisture content, and thus stabilize the quality of cigarette products.

[0033] 5. The tobacco foreign matter removal device of the silk production line of the present invention adopts positive pressure wind conveying for feeding, and pneumatic conveying is adopted in core links such as the heavier foreign matter removal unit, the moderate foreign matter removal unit and the tobacco humidification unit. Compared with the current silk production line's flexible air selection feeding using a vibrating conveyor belt thinning method, it can effectively improve the looseness of the tobacco and at the same time increase the tobacco processing flow rate, and is therefore more conducive to large-scale industrial production.

[0034] 6. The tobacco foreign body removal device for the tobacco production line of the present invention has a compact and simple structure, strong operability and applicability, and has good application prospects and promotion and application value. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] 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.

[0036] Figure 1 It is a schematic diagram of the overall structure of the tobacco foreign matter removal device of the tobacco production line of the present invention.

[0037] Figure numerals: N1—raw tobacco feeding and conveying unit; N2—heavier foreign matter removal unit; N3—loose tobacco recovery unit; N4—moderate foreign matter removal unit; N5—tobacco humidification unit; N6—lighter foreign matter removal unit; 1-pneumatic conveying inlet; 2-pneumatic conveying pipe; 3-raw tobacco feeding device; 4-feeding air lock; 5-heavier foreign matter air separation cylinder; 6-mechanical breaking device; 7-pneumatic conveying square tube; 8-image recognition system; 9-image acquisition camera; 10-light source; 11-moderate foreign matter removal system; 12-compressed air blowing pipe; 13-solenoid valve; 14- Servo controller for detecting and identifying signals; 15-recovering tobacco conveying pipe; 16-inclined guide pipe; 17-positive pressure air conveying pipe; 18-moderate foreign matter dropping cylinder; 19-moderate foreign matter discharge air lock; 20-moderate foreign matter discharge port; 21-tobacco wind separation device; 22-heavier foreign matter discharge air lock; 23-heavier foreign matter discharge port; 24-pneumatic conveying circular pipe; 25-humidifying nozzle; 26-horizontal guide pipe; 27-lighter foreign matter wind separation cylinder; 28-purified tobacco discharge air lock; 29-purified tobacco collection device; 30-lighter foreign matter pneumatic conveying pipe; 31-lighter foreign matter collection device. DETAILED DESCRIPTION

[0038] 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.

[0039] Example:

[0040] like Figure 1 As shown, a tobacco foreign matter removal device for a tobacco production line comprises: a raw tobacco feeding and conveying unit N1, a heavier foreign matter removal unit N2, a tobacco loose recovery unit N3, a moderate foreign matter removal unit N4, a tobacco humidification unit N5 and a lighter foreign matter removal unit N6; the raw tobacco feeding and conveying unit N1 is located upstream of the heavier foreign matter removal unit N2; the heavier foreign matter removal unit N2 is located above the tobacco loose recovery unit N3 and below the moderate foreign matter removal unit N4; the tobacco humidification unit N5 is located downstream of the moderate foreign matter removal unit N4; and the lighter foreign matter removal unit N6 is located downstream of the tobacco humidification unit N5.

[0041] The raw tobacco feeding and conveying unit N1 comprises a horizontally placed pneumatic conveying pipe 2 and a raw tobacco feeding device 3, wherein the raw tobacco feeding device 3 is located above the pneumatic conveying pipe 2 and connected via a feed air lock 4, and one end of the pneumatic conveying pipe 2 is a pneumatic conveying inlet 1 connected to a positive pressure fan;

[0042] The heavier foreign matter removal unit N2 comprises a vertically arranged cylindrical heavier foreign matter air separation cylinder 5; the other end of the pneumatic conveying pipe 2 is connected to the wall of the middle and lower part of the heavier foreign matter air separation cylinder 5;

[0043] The tobacco loose recovery unit N3 includes a mechanical disintegration device 6, an inclined guide pipe 16, a positive pressure air delivery pipe 17, a tobacco wind selection and separation device 21 and a recovered tobacco conveying pipe 15; the inclined guide pipe 16 is tilted, and its lower end is connected to the discharge port of the mechanical disintegration device 6 and the inlet of the positive pressure air delivery pipe 17, and its upper end is connected to the feed port of the wind selection and separation device 21; one end of the positive pressure air delivery pipe 17 is connected to a positive pressure fan; the discharge port of the wind selection and separation device 21 is connected to one end of the recovered tobacco conveying pipe 15; the recovered tobacco conveying pipe 15 is tilted, and its other end is connected to the wall of the upper and middle part of the heavier foreign matter wind selection and separation cylinder 5; the lower part of the wind selection and separation device 21 is a heavier foreign matter discharge port 23, and the discharge port is provided with a heavier foreign matter discharge air lock 22; the mechanical disintegration device 6 is connected to the bottom barrel opening of the heavier foreign matter wind selection and separation cylinder 5;

[0044] The moderate foreign matter removal unit N4 includes a horizontally placed pneumatic conveying square tube 7, an image recognition system 8, a moderate foreign matter removal system 11, and a moderate foreign matter blanking barrel 18; wherein the image recognition system 8 includes an image acquisition camera 9 and a light source 10, and the moderate foreign matter removal system 11 includes a compressed air blowing pipe 12, a solenoid valve 13 and a detection and recognition signal servo controller 14; the pneumatic conveying square tube 7 is connected to the upper barrel opening of the heavier foreign matter air separation barrel 5; the image recognition system 8 is adjacent to the moderate foreign matter removal system 11 and the image recognition system 8 is adjacent to the moderate foreign matter removal system 11. The identification system 8 is arranged upstream of the moderate foreign body rejection system 11, and the image recognition system 8 and the moderate foreign body rejection system 11 are arranged above the transverse pneumatic conveying square tube 7; the moderate foreign body blanking barrel 18 is arranged below the transverse pneumatic conveying square tube 7 and opposite to the moderate foreign body rejection system 11; the moderate foreign body blanking barrel 18 is arranged vertically and its upper barrel opening is connected to the wall of the transverse pneumatic conveying square tube 7, and the lower barrel opening of the moderate foreign body blanking barrel 18 is a moderate foreign body discharge port 20, and the barrel opening is provided with a moderate foreign body discharge air lock 19;

[0045] The tobacco humidification unit N5 comprises a vertically arranged pneumatic conveying circular tube 24, a humidification nozzle 25 and a horizontal guide tube 26. The humidification nozzles 25 are multiple and symmetrically arranged on the inner wall of the pneumatic conveying circular tube 24. The bottom opening of the pneumatic conveying circular tube 24 is connected to the horizontal guide tube 26, and the upper opening thereof is connected to the outlet of the horizontally placed pneumatic conveying square tube 7.

[0046] The lighter foreign matter removal unit N6 includes a vertically arranged lighter foreign matter air separation cylinder 27; the upper port of the lighter foreign matter air separation cylinder 27 is connected to the horizontally arranged lighter foreign matter conveying pipe 30, and its bottom port is connected to the purified tobacco discharge air lock 28 and the purified tobacco collecting device 29; the other port of the lighter foreign matter conveying pipe 30 is connected to the lighter foreign matter collecting device 31; the discharge port of the horizontal guide pipe 26 is connected to the side wall of the middle and lower part of the lighter foreign matter air separation cylinder 27.

[0047] The wind speed of the positive pressure wind entering the heavier foreign matter air separation cylinder 5 from the pneumatic conveying inlet 1 is 2.0 m / s to 8.0 m / s; 3.5 m / s is preferred in this embodiment.

[0048] Among them, the width of the square tube of the horizontal pneumatic conveying square tube 7 is 0.5m~2.0m, preferably 1.0m, and the height of the square tube is 0.1m~0.5m, preferably 0.2m; the horizontal pneumatic conveying square tube 7 is made of transparent material such as organic glass or tempered glass, and tempered glass is preferably used in this embodiment to facilitate image acquisition and identification of foreign objects under the irradiation of the light source 10.

[0049] The wind speed of the positive pressure wind entering the air separation device 21 from the inclined guide pipe 16 is 2.0 m / s to 6.0 m / s, and is preferably 2.8 m / s in this embodiment.

[0050] The wind speed of the positive pressure wind entering the lighter foreign matter air separation cylinder 27 from the horizontal guide pipe 26 is in the range of 0.5 m / s to 1.0 m / s, and 0.5 m / s is preferred in this embodiment.

[0051] The second aspect of the present invention discloses a method for removing foreign matter from tobacco in a tobacco production line, using the above-mentioned tobacco production line foreign matter removal device, including the steps of removing heavier foreign matter, removing moderate foreign matter, humidifying tobacco, and removing lighter foreign matter, which are specifically as follows:

[0052] Step 1: Removal of heavier foreign matter

[0053] The raw tobacco shreds enter the pneumatic conveying pipe 2 through the raw tobacco shreds feeding device 3 and the feed air lock 4, and enter the heavier foreign matter air separation cylinder 5 under the action of the positive pressure fan on the pneumatic conveying inlet 1. After entering the heavier foreign matter air separation cylinder (5), under the combined action of the vertical upward positive pressure wind force and the raw material's own gravity, the moderate and lighter foreign matter and tobacco shreds enter the top of the heavier foreign matter air separation cylinder 5 and are conveyed to the horizontally placed pneumatic conveying square tube 7; while the heavier foreign matter with larger density falls downward and enters the mechanical breaking device 6, and is broken up by the mechanical breaking device 6. After being fully loosened by the dispersing device 6, the tobacco enters the air separation device 21 along the inclined guide pipe 16 under the action of the positive pressure wind entering from the positive pressure air delivery pipe 17. After entering the air separation device 21, under the combined action of the vertical upward positive pressure wind and the weight of the material itself, the lighter part of the tobacco is returned to the heavier foreign matter air separation cylinder 5 along the recovered tobacco conveying pipe 15 and then conveyed to the horizontally placed pneumatic conveying square pipe 7. The heavier foreign matter after separation is discharged through the heavier foreign matter discharge air lock 22 and the heavier foreign matter discharge port 23;

[0054] Step 2: Moderate foreign body removal

[0055] Step 1: Moderate and light foreign matter and shredded tobacco conveyed to the horizontally placed pneumatic conveying square tube 7 are identified as foreign matter in the shredded tobacco by the image recognition system 8 and removed by the moderate foreign matter removal system 11; the shredded tobacco with moderate foreign matter removed continues to move downstream along the horizontal pneumatic conveying square tube 7 and enters the vertically arranged pneumatic conveying circular tube 24; and the removed moderate foreign matter falls into the moderate foreign matter blanking barrel 18 and is discharged through the moderate foreign matter discharge air lock 19 and the moderate foreign matter discharge port 20;

[0056] Step 3: Humidification of tobacco

[0057] The tobacco shreds with moderate foreign matter removed from the vertically arranged pneumatic conveying circular tube 24 in step 2 are humidified by the water vapor sprayed by the humidifying nozzle 25 during the downward movement, and the humidified tobacco shreds are conveyed to the lighter foreign matter air separation cylinder 27 through the horizontal guide pipe 26;

[0058] Step 4: Removal of lighter foreign matter

[0059] In step three, the tobacco is conveyed to the lighter foreign matter air separation cylinder 27. Under the combined effect of the weak vertical upward positive pressure wind entering the lighter foreign matter air separation cylinder 27 and the material's own gravity, the humidified tobacco falls downward along the lighter foreign matter air separation cylinder 27, and enters the purified tobacco collecting device 29 through the purified tobacco discharge air lock 28, namely, the qualified purified tobacco; while the lighter foreign matter floats upward along the lighter foreign matter air separation cylinder 27, enters the lighter foreign matter collecting device 31 through the lighter foreign matter conveying pipe 30 and is then discharged.

[0060] The experimental object of this embodiment is 1000kg of dried tobacco leaves from a certain cigarette brand’s silk production line, of which the moisture content is 12.98%; foreign matter in tobacco leaves is mainly stems and clumped tobacco leaves, and after testing, foreign matter in tobacco leaves accounts for 7.65%. The above tobacco leaves are divided into two equal parts, 500kg each; the tobacco leaves foreign matter removal device of the silk production line of the present invention and the existing FS417A type leaf flexible air separator of the silk production line are used to remove foreign matter from tobacco leaves, and the purity and moisture content of the treated tobacco leaves are tested. The effects of the two methods of removing foreign matter from tobacco leaves are compared and analyzed, and the results are shown in Table 1. The purity of tobacco leaves is calculated as follows: [(1-mass of foreign matter in tobacco leaves) / mass of tobacco leaves]×100%.

[0061] Table 1 Comparison of the effects of two methods in removing foreign matter from tobacco

[0062] Mass of tobacco foreign matter removed (kg) Tobacco purity Moisture content of tobacco after treatment FS417A Flexible Air Separator 20.37 96.43％ 12.34％ The device of the present invention 35.48 99.45％ 13.01％

[0063] As can be seen from Table 1, compared with the current FS417A leaf flexible air separator for the silk production line, when the same tobacco is processed, the tobacco foreign body removal device for the silk production line of the present invention can remove tobacco foreign bodies more completely, and the purity of tobacco is higher. At the same time, the moisture content of tobacco is slightly different from that before treatment. This shows that the device of the present invention can effectively remove foreign bodies from tobacco, significantly improve the purity of tobacco, and keep the moisture content of tobacco basically unaffected, thereby improving the use value of tobacco and stabilizing the quality of cigarette products, which has a good promoting effect on improving the core competitiveness of cigarette companies and continuously promoting the high-quality development of cigarette brands.

[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 tobacco foreign body removal device for a tobacco production line, characterized in that: It includes: Raw tobacco feeding and conveying unit, heavier foreign matter removal unit, loose tobacco recovery unit, medium foreign matter removal unit, tobacco humidification unit and lighter foreign matter removal unit; The raw tobacco feeding and conveying unit is located upstream of the heavier foreign matter removal unit; the heavier foreign matter removal unit is located upstream of the tobacco loose recovery unit and below the medium foreign matter removal unit; the tobacco humidification unit is located downstream of the medium foreign matter removal unit; and the lighter foreign matter removal unit is located downstream of the tobacco humidification unit. The raw tobacco feeding and conveying unit comprises a horizontally placed pneumatic conveying pipe and a raw tobacco feeding device, wherein the raw tobacco feeding device is located above the pneumatic conveying pipe and is connected through a feed air lock, and one end of the pneumatic conveying pipe is a pneumatic conveying inlet connected to a positive pressure fan; The heavy foreign matter removal unit comprises a vertically arranged cylindrical heavy foreign matter air separation cylinder; the other end of the pneumatic conveying pipe is connected to the wall of the middle and lower part of the heavy foreign matter air separation cylinder; The tobacco loose recovery unit comprises a mechanical breaking device, an inclined guide pipe, a positive pressure air delivery pipe, a tobacco wind selection and separation device and a recovered tobacco conveying pipe; the inclined guide pipe is placed obliquely, and its lower end is connected to the discharge port of the mechanical breaking device and the inlet of the positive pressure air delivery pipe, and its upper end is connected to the feed port of the tobacco wind selection and separation device; one end of the positive pressure air delivery pipe is connected to a positive pressure fan; the discharge port of the tobacco wind selection and separation device is connected to one end of the recovered tobacco conveying pipe; the recovered tobacco conveying pipe is placed obliquely, and its other end is connected to the wall of the upper middle part of the heavier foreign matter wind selection and separation cylinder; the lower part of the tobacco wind selection and separation device is a heavier foreign matter discharge port, and the discharge port is provided with a heavier foreign matter discharge air lock; the mechanical breaking device is connected to the bottom barrel opening of the heavier foreign matter wind selection and separation cylinder; The moderate foreign matter removal unit comprises a horizontally placed pneumatic conveying square tube, an image recognition system, a moderate foreign matter rejection system, and a moderate foreign matter blanking barrel; wherein the image recognition system comprises an image acquisition camera and a light source, and the moderate foreign matter rejection system comprises a compressed air blowing tube, a solenoid valve, and a detection and recognition signal servo controller; the pneumatic conveying square tube is connected to the upper barrel opening of the heavier foreign matter air separation barrel; the image recognition system is adjacent to the moderate foreign matter rejection system and the image recognition system is arranged upstream of the moderate foreign matter rejection system, and the image recognition system and the moderate foreign matter rejection system are arranged above the pneumatic conveying square tube; the moderate foreign matter blanking barrel is arranged below the pneumatic conveying square tube and opposite to the moderate foreign matter rejection system; the moderate foreign matter blanking barrel is arranged vertically, and its upper barrel opening is connected to the wall of the pneumatic conveying square tube, and the lower barrel opening of the moderate foreign matter blanking barrel is the moderate foreign matter discharge opening, and the barrel opening is provided with a moderate foreign matter discharge air lock; The tobacco humidification unit comprises a vertically arranged pneumatic conveying circular tube, a humidification nozzle and a horizontal guide tube. The humidification nozzles are located on the inner wall of the pneumatic conveying circular tube and are arranged symmetrically. The bottom opening of the pneumatic conveying circular tube is connected to the horizontal guide tube, and the upper opening thereof is connected to the outlet of the horizontally placed pneumatic conveying square tube. The lighter foreign matter removal unit includes a vertically arranged lighter foreign matter air separation cylinder; the upper port of the lighter foreign matter air separation cylinder is connected to the horizontally arranged lighter foreign matter conveying pipe, and its bottom port is connected to the purified tobacco discharge air lock and the purified tobacco collecting device; the other port of the lighter foreign matter conveying pipe is connected to the lighter foreign matter collecting device; the discharge port of the horizontal guide pipe is connected to the side wall of the middle and lower part of the lighter foreign matter air separation cylinder.

2. The tobacco foreign matter removal device for a tobacco production line according to claim 1, characterized in that: The wind speed of the positive pressure wind entering the heavier foreign matter air separation cylinder from the pneumatic conveying inlet ranges from 2.0 m / s to 8.0 m / s.

3. The tobacco foreign matter removal device for a tobacco production line according to claim 1, characterized in that: The width of the pneumatic conveying square tube is 0.5 m to 2.0 m, and the height of the square tube is 0.1 m to 0.5 m; the pneumatic conveying square tube is made of transparent material.

4. The tobacco foreign matter removal device for a tobacco production line according to claim 1, characterized in that: The wind speed of the positive pressure wind entering the tobacco wind selection and separation device from the inclined guide pipe is 2.0 m / s to 6.0 m / s.

5. The tobacco foreign matter removal device for a tobacco production line according to claim 1, characterized in that: The wind speed of the positive pressure wind entering the lighter foreign matter air separation cylinder from the horizontal guide pipe ranges from 0.5 m / s to 1.0 m / s.

6. A method for removing foreign matter from tobacco shreds in a tobacco production line, characterized in that: The tobacco foreign matter removal device for a tobacco production line according to claim 1 includes the steps of removing heavier foreign matter, removing moderate foreign matter, humidifying tobacco and removing lighter foreign matter, which are specifically as follows: Step 1: Removal of heavier foreign matter The raw tobacco enters the pneumatic conveying pipe through the raw tobacco feeding device and the feed air lock, and enters the heavier foreign matter air separation cylinder under the action of the positive pressure fan on the pneumatic conveying inlet. Under the combined action of the vertical upward positive pressure wind force and the raw material's own gravity, the medium and lighter foreign matter and tobacco enter the top of the heavier foreign matter air separation cylinder and are conveyed to the horizontally placed pneumatic conveying square tube; while the heavier foreign matter with higher density falls downward into the mechanical breaking device and is mechanically broken. After being fully loosened by the dispersing device, the tobacco enters the tobacco wind separation device along the inclined guide pipe under the action of the positive pressure wind entering from the positive pressure air delivery pipe. After entering the tobacco wind separation device, the lighter part of the tobacco is returned to the heavier foreign matter wind separation cylinder along the tobacco recovery conveying pipe under the combined action of the positive pressure wind and the material's own gravity, and then is conveyed to the horizontally placed pneumatic conveying square pipe. The heavier foreign matter after separation is discharged through the heavier foreign matter discharge air lock and the heavier foreign matter discharge port. Step 2: Moderate foreign body removal Step 1: Moderate and relatively light foreign matter and shredded tobacco are transported to the horizontally placed pneumatic conveying square tube, and the foreign matter in the shredded tobacco is identified by the image recognition system and removed by the moderate foreign matter removal system; the shredded tobacco with the moderate foreign matter removed continues to move downstream along the pneumatic conveying square tube and enters the vertically arranged pneumatic conveying circular tube; and the removed moderate foreign matter falls into the moderate foreign matter blanking barrel and is discharged through the moderate foreign matter discharge air lock and the moderate foreign matter discharge port; Step 3: Humidification of tobacco The tobacco shreds with moderate foreign matter removed from the vertically arranged pneumatic conveying circular tube in step 2 are humidified by the water vapor sprayed by the humidification nozzle during the downward movement, and the humidified tobacco shreds are conveyed to the lighter foreign matter air separation cylinder through the horizontal guide pipe; Step 4: Removal of lighter foreign matter In step three, the humidified tobacco is conveyed to the lighter foreign matter air separation cylinder. Under the combined effect of the weak vertical upward positive pressure wind entering the lighter foreign matter air separation cylinder and the material's own gravity, the humidified tobacco falls downward along the lighter foreign matter air separation cylinder, and enters the purified tobacco collecting device through the purified tobacco discharge air lock, namely, the qualified purified tobacco; while the lighter foreign matter floats upward along the lighter foreign matter air separation cylinder, and enters the lighter foreign matter collecting device through the lighter foreign matter conveying pipe.

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