CN114522884A

CN114522884A - Off-line processing and recycling equipment and method for finely separating and classifying tobacco scraps

Info

Publication number: CN114522884A
Application number: CN202210141577.9A
Authority: CN
Inventors: 李存华; 金剑; 鲁勇; 罗开才; 祁跃东; 邓光华; 邱仕强; 潘文; 尹坚; 冯欣; 陈晓峰; 麦建明; 窦元春
Original assignee: Hongta Tobacco Group Co Ltd
Current assignee: Hongta Tobacco Group Co Ltd
Priority date: 2022-02-16
Filing date: 2022-02-16
Publication date: 2022-05-24
Anticipated expiration: 2042-02-16
Also published as: CN114522884B

Abstract

The invention is suitable for the raw material primary processing of a tobacco redrying workshop, and relates to off-line processing and recycling equipment and a method for finely separating and classifying tobacco scraps, which are arranged in an independent workshop and comprise a first-stage vibrating screen two-layer screening device, a first-stage gravity winnowing machine, a second-stage vibrating screen two-layer screening device, a second-stage gravity winnowing machine, a third-stage vibrating screen single-layer screening device and a fourth-stage vibrating screen two-layer screening device which are sequentially arranged along the conveying main line direction of the tobacco scraps, and further comprise a cyclone dust collector and a circular vibrating screen. The classification of the tobacco scraps larger than 1.5mm square tobacco flakes is mainly finished by a (4+1) grade vibrating screen (namely a 4 grade main vibrating screen and a 1 grade branch vibrating screen) and a two-grade gravity winnowing machine, and the classification of the tobacco scraps smaller than 1.5mm square tobacco flakes and cigarette ash is mainly finished by a cyclone dust collector and a circular vibrating screen; the separation and elimination of the non-tobacco impurity, namely the hemp and velvet yarns of the tobacco scraps mainly adopt a sticky hair belt for impurity removal, a sticky hair wheel for impurity removal and a hemp and velvet eliminating machine for impurity removal, so that the utilization rate and the purity of tobacco raw materials are improved.

Description

Off-line processing and recycling equipment and method for finely separating and classifying tobacco scraps

Technical Field

The invention relates to the technical field of tobacco processing, is suitable for primary processing of raw materials in a tobacco redrying workshop, and particularly relates to off-line processing and recycling equipment and method for finely separating and classifying tobacco scraps.

Background

In the tobacco industry, tobacco scraps generally refer to a mixture of various tobacco leaves and tobacco scraps produced in cigarette production, and are also generally called as shredded tobacco. Aiming at each tobacco leaf fragment generated in a threshing and redrying workshop, the tobacco leaf fragment is a complex mixture, contains precious tobacco leaves and tobacco stems, also contains fiber hemp threads and the like which are harmful to cigarette products, and the like, so the refined separation and classification of the tobacco leaf fragments are always the key points and difficulties of the tobacco processing industry.

Although the tobacco leaves purchased from cigarette farmers at each tobacco collection station are subjected to fine sorting, strict quality control and the like, tens of thousands of tons of tobacco leaves purchased every year contain more or less non-tobacco impurities which are forbidden to enter the cigarette process so as to ensure the purity of raw materials of each cigarette, so that the processes of re-drying, shredding and the like before cigarettes are all eliminated by adopting advanced technological means and large-scale manpower and material resources, and particularly in the re-drying process, the non-tobacco impurities generally comprise 3 types: 1) polystyrene film, metal, worm eggs, insects, sealing bags, cigarette ends, plastic fibers, rubber strips, feathers and wool, 2) cloth pieces, glove fragments, glass, broken stones, paper scraps, hemp threads, wood chips and cotton wool, 3) non-tobacco plants, broom hair, straw and the like, and also comprises unusable tobacco leaves such as mildewed tobacco, polluted tobacco, green and miscellaneous tobacco leaves and the like, so that the tobacco fragments in the redrying workshop not only easily comprise certain types of the non-tobacco impurities, but also comprise other types such as dust, dust and hair, cotton wool and the like falling on the body of a worker. Therefore, the completion of the separation and classification research of the tobacco scraps is a technical problem of the basics and commonalities in the tobacco field and is always a permanent subject for realizing the lean production of tobacco.

The tobacco scraps produced in the redrying workshop are mainly produced by the following steps: 1) the purchased tobacco leaves are conveyed to a redrying workshop to produce broken tobacco scraps when the box is opened; 2) tobacco leaf bundle spreading and grading, and broken tobacco scraps generated in tobacco leaf sorting, and 3) cleaning broken tobacco scraps generated in a material preparation area; 4) the broken tobacco scraps produced after cleaning on each production line, each machine table or in each pipeline. Obviously, the tobacco scraps are mixed with complex components, and some components such as fiber hemp, cotton velvet and the like cannot be found in time by naked eyes, so that the tobacco scraps contain a large amount of tobacco flakes and tobacco stems with various specifications and also contain non-tobacco impurities. If the tobacco flakes with the size of less than 1.5mm square are divided into cigarette ash and sesame flakes for grading treatment, the tobacco flake with the size of 1.5 mm-60 mm square accounts for the largest proportion, and the tobacco flake with the size of more than 60mm square, namely more than 1.5mm square can be separated and classified for recycling; the tobacco flakes with the particle size less than 1.5mm contain other materials such as powder and dust, and can be separated and classified into cigarette ash and sesame flakes to be recycled for other uses, such as tobacco sheet manufacturing and the like. Therefore, the refined separation, classification and recovery of the tobacco scraps are obvious to the importance of the tobacco processing industry, firstly, the raw material cost is obviously saved, such as the separation and classification of tobacco flakes larger than 1.5mm are realized, the rapid utilization of the production process is convenient, secondly, non-smoke impurities are removed, the purity of the tobacco raw materials is ensured, and thirdly, the cigarette ash powder is collected, so that the deep processing and the environmental protection are facilitated.

In the past, due to insufficient strength of scientific and technological research, the treatment of tobacco fragments is usually performed by manual screening and manual sorting, the environment pollution of dust is large, the tobacco fragments which are easy to sort are usually large pieces of tobacco leaves and tobacco stems and non-tobacco impurities which are easy to remove, the cleaned fragments including small tobacco fragments are usually treated as wastes, and moreover, if 5 tons of tobacco fragments are required to be manually screened every day, a large amount of manpower and material resources are required, the difficulty is large, and the environment pollution is large; at present, in some redrying processes, a tobacco scrap treatment process is also accompanied, but the online treatment process is generally designed to be accompanied by a redrying production line, for example, in Yuxi cigarette factories, the online treatment process is also mainly used for collecting and classifying scattered and crushed tobacco leaves generated in each process in the redrying process in real time, the treatment method is difficult to realize the refined separation, classification and recovery degree of the tobacco scraps, and particularly, after the tobacco scraps, tobacco stems and leaves with stems of larger sizes are separated and classified and collected, for example, the tobacco scraps of more than 4.5mm square are returned to a threshing production line to be directly added to the redrying production line, namely, the threshing process is returned to the threshing process, and the tobacco scraps of more than 1.5mm and less than 4.5mm square are independently treated in the crushed tobacco drying line; other sort additions, sort recycles, etc.

In summary, the research on the fine separation, classification, processing and recovery of the tobacco fragments has high technical difficulty and technological level for the primary processing field of the raw materials of the tobacco redrying, but has great significance, can obtain obvious economic benefit and social environmental protection benefit, improves the utilization rate and purity of the raw materials, realizes the lean production of the tobacco and improves the quality of the cigarettes, and has popularization and demonstration significance.

Disclosure of Invention

The invention provides an off-line processing and recycling device and method for finely separating and classifying tobacco fragments, aiming at solving the problems of finely separating, classifying and recycling complex mixtures of the tobacco fragments collected in a redrying workshop and realizing the classification of various tobacco fragment specifications and the elimination of non-tobacco impurities.

Aiming at the scheme, the method comprises the following steps: 1. the separation and classification of the 9 specifications comprises designing non-smoke impurities such as hemp shreds into an off-line mode, namely designing an independent processing production line, and arranging the processing line in an independent workshop with dust removal capacity, realizing closed-loop flow line production, and ensuring dust-free and environmental sanitation of a working site. The classification of the tobacco scraps larger than 1.5mm square tobacco flakes is mainly finished by a (4+1) grade vibrating screen (namely a 4 grade main vibrating screen and a 1 grade branch vibrating screen) and a two-grade gravity winnowing machine, and the classification of the tobacco scraps smaller than 1.5mm square tobacco flakes and ash dust is mainly finished by a cyclone dust collector and a circular vibrating screen; the method mainly comprises the steps of removing impurities by a sticky hair belt, removing impurities by a sticky hair wheel and removing impurities by a hemp thread remover.

The technical scheme adopted by the invention is as follows:

on one hand, the off-line processing and recycling equipment for finely separating and classifying the tobacco scraps comprises a first-stage vibrating screen two-layer screening device (8), a first-stage gravity winnowing machine (9), a second-stage vibrating screen two-layer screening device (13), a second-stage gravity winnowing machine (14), a third-stage vibrating screen single-layer screening device (19) and a fourth-stage vibrating screen two-layer screening device (20) which are sequentially arranged along the conveying main line direction of the tobacco scraps, and further comprises a cyclone dust collector (22) and a circular vibrating screen (24);

sieving by a first-stage vibrating screen two-layer sieving device to obtain tobacco flakes larger than 60mm square, winnowing by a first-stage gravity winnowing machine to obtain tobacco stems smaller than 60mm square, sieving by a second-stage vibrating screen two-layer sieving device to obtain tobacco flakes larger than 20mm and smaller than 60mm square, winnowing by a second-stage gravity winnowing machine to obtain tobacco stems smaller than 20mm square, sieving by a third-stage vibrating screen single-layer sieving device to obtain tobacco flakes larger than 8mm and smaller than 20mm square, and sieving by a fourth-stage vibrating screen two-layer sieving device to obtain tobacco flakes larger than 4.5mm and smaller than 8mm square and tobacco flakes larger than 1.5mm and smaller than 4.5mm square; the first, second and fourth vibrating screen two-layer screening devices can screen the tobacco flakes and the cigarette ash with the square size less than 1.5 mm;

the cyclone dust collector and the circular vibrating screen are used for separating and classifying the tobacco flakes, the cigarette ash and the dust which are generated in each process and have a square size of less than 1.5 mm.

Furthermore, a tobacco stem outlet below the first-stage gravity winnowing machine (9) is connected with a single-layer tobacco stem vibrating screen screening device (9-1), tobacco stems with the size smaller than 60mm square and tobacco flake ash with the size smaller than 1.5mm square are separated through the single-layer tobacco stem vibrating screen screening device (9-1), and the tobacco flake ash with the size smaller than 1.5mm square is guided into an ash collector (9-1-1) for processing.

Furthermore, a quantitative feeding platform (2) is arranged at the starting end of the tobacco scrap conveying main line, and a uniform distribution roller (3) and a first belt conveying lifting belt (5) are sequentially arranged between the quantitative feeding platform (2) and the first-stage vibrating screen two-layer screening device (8) along the conveying main line direction; a centrifugal gas-material separator (15), a hemp thread remover (16), a gathering conveying belt (17) and a second belt conveying lifting belt (18) are sequentially arranged between the second-stage gravity winnowing machine (14) and the third-stage vibrating screen single-layer screening device (19) along the conveying main line direction;

a negative pressure dust removal pipe (2-1, 8-3, 13-3, 18-1, 19-3, 20-2 and 21-1) is respectively arranged above a quantitative feeding platform (2), at the square outlet end smaller than 1.5mm of a first-stage vibrating screen two-layer screening device (8), at the square outlet end smaller than 1.5mm of a second-stage vibrating screen two-layer screening device (13), at the tail end of a second belt conveying lifting belt (18), at the inlet end of a third-stage vibrating screen single-layer screening device (19), at the square outlet end smaller than 1.5mm of a fourth-stage vibrating screen two-layer screening device (20), at the square outlet end larger than 4.5mm and smaller than 8mm of a fourth-stage vibrating screen two-layer screening device (20), and at the square outlet end of the fourth-stage vibrating screen two-layer screening device (24), and the circular vibrating screen (24) is used for separating three substances: tobacco flakes (24-1), soot and dust (24-2), sesame flakes (24-3);

the end of the outlet of the screen drum end of the first-stage vibrating screen two-layer screening device (6) above the feeding end, the centrifugal gas-material separator (15) and the gathering conveyor belt (17) is respectively provided with a wind conveying dust removal pipe (6-1, 15-1 and 17-1), the collected cigarette ash, dust and floating scattered broken smoke are guided into a cyclone dust collector (22) through the wind conveying dust removal pipe, and the cyclone dust collector separates out: the ash, dust and crushed smoke are guided into a circular vibrating screen (24).

Further, the circular vibrating screen (24) is arranged in a separate dust removing room (23).

Furthermore, the pressure difference of air pressure of the negative pressure dust removal pipes (2-1, 8-3, 13-3, 18-1, 19-3, 20-2 and 21-1) and the feeding ports of the wind power conveying dust removal pipes (6-1, 15-1 and 17-1) is 25-35 Pa, and the wind speed is 5-10 m/s; in a wind power conveying dust removal pipe (15-1) of the centrifugal gas-material separator (15), the pressure difference of air pressure is 120-140 Pa, and the wind speed is 14-16 m/s.

Furthermore, the diameter of the pipeline of the feeding branch pipe of each negative pressure dust removing pipe and the feeding branch pipe of each wind power conveying dust removing pipe is 160-170 mm, and the diameter of the main pipeline is 250-610 mm.

Furthermore, sticky felt belt impurity removal devices (4, 7 and 12) are respectively arranged at the tail end of the uniform distribution roller (3), the feeding end (6) of the first-stage vibrating screen two-layer screening device and the feeding end (11) of the second-stage vibrating screen two-layer screening device so as to adsorb and remove non-smoke impurities.

Furthermore, a sticking hair wheel impurity removal device (8-1, 13-1, 19-1 and 9-2) is arranged at an outlet of a square tobacco flake larger than 60mm of the first-stage vibrating and screening two-layer screening device (8), an outlet of a square tobacco flake larger than 20mm and smaller than 60mm of the second-stage vibrating and screening two-layer screening device (13), an outlet of a single-layer tobacco flake larger than 8mm and smaller than 20mm of the third-stage vibrating and screening device (19) and a tobacco stem outlet of a single-layer tobacco stem vibrating and screening device (9-1) below the first-stage gravity winnowing machine and is used for adsorbing and removing non-tobacco impurities.

Further, a first-stage vibrating screen two-layer screening device (8) and a second-stage vibrating screen two-layer screening deviceThe grade vibration sieve two-layer screening device (13) and the fourth grade vibration sieve two-layer screening device (20) are both upper and lower double-layer screens, and the mesh diameters of the lower screens are all

The diameter of the mesh of the upper layer screen of the first-stage vibrating screen two-layer screening device (8) is

The diameter of the mesh of the upper layer screen mesh of the second-stage vibrating screen two-layer screening device (13) is

The diameter of the mesh of the upper layer screen mesh of the fourth-stage vibrating screen two-layer screening device (20) is

The third-stage vibrating screen single-layer screening device (19) and the single-layer tobacco stem vibrating screen screening device (9-1) are single-layer screens, and the diameter of the meshes of the screens of the third-stage vibrating screen single-layer screening device (19) is

The diameter of the mesh of the screen mesh of the single-layer tobacco stem vibrating screen screening device (9-1) is

Further, each screen has a mesh diameter of

The center distance S between any two adjacent meshes is equal, and

in another aspect, an off-line processing and recycling method for finely separating and classifying tobacco scraps is provided:

and (3) separating and classifying various tobacco flakes with square size larger than 1.5 mm: according to the conveying direction of tobacco scraps, tobacco flakes larger than 60mm square and tobacco flake mixed materials smaller than 60mm square are separated by a first-stage vibrating screen two-layer screening device (8), the tobacco flake mixed materials smaller than 60mm square are input into a first-stage gravity winnowing machine (9) for air separation of tobacco stems, the remaining materials are input into a second-stage vibrating screen two-layer screening device (13) for separation of tobacco flakes larger than 20mm square and smaller than 60mm square and tobacco flake mixed materials smaller than 20mm square, the tobacco flake mixed materials smaller than 20mm square are input into a second-stage gravity winnowing machine (14) for winnowing, after the tobacco stems are winnowed, the remaining materials are input into a centrifugal gas-material separator (15) by air conveying to separate the tobacco flake mixed materials and dust-containing gas, the separated tobacco flake mixed materials fall into a hemp thread removing machine (16) for impurity removal, the impurity removal is input into a third-stage vibrating screen single-layer screening device (19) for separation of the tobacco flakes larger than 8mm square and smaller than 20mm square and the tobacco flake mixed materials smaller than 8mm square, inputting the tobacco flake mixed material with the square of less than 8mm into a fourth-stage vibrating screen two-layer screening device (20) to respectively obtain two types of tobacco flakes with the square of more than 1.5mm and less than 4.5mm and the square of more than 4.5mm and less than 8 mm;

and (3) separating and classifying various tobacco flakes and cigarette ash with the square of less than 1.5 mm: the tobacco flakes and the cigarette ash which are obtained by sieving the first, the second and the fourth vibrating screen two-layer sieving devices (8, 13, 20) and are less than 1.5mm square are respectively sieved, the tobacco flakes and the cigarette ash floating above the quantitative feeding platform (2), the cigarette ash generated at the inlet end of the third vibrating screen single-layer sieving device (19) and the cigarette ash generated at the outlet end of the fourth vibrating screen two-layer sieving device (20) are converged into a negative pressure dust removal pipe and are guided into a dust removal room (23), and then the tobacco flakes and the cigarette ash are guided into a circular vibrating screen (24) to be separated and classified; the tobacco flakes and the tobacco ash with the square size smaller than 1.5mm obtained by the single-layer tobacco stem vibrating screen screening device (9-1) are separately treated by a tobacco ash collector (9-1-1);

for dust removal: the method comprises the steps of connecting ash, dust and floating scattered crushed smoke generated above a material input end of a first-stage vibrating screen two-layer screening device (8), an outlet at one end of a screen drum of a centrifugal gas-material separator (15) and an end process point of a gathering conveying belt (17) behind a hemp thread removing machine (16) into a wind power conveying dust removal pipe to be guided into a cyclone dust collector (22), separating and collecting the dust, and guiding the rest materials into a circular vibrating screen (24) in a dust removal room (23) for separation and classification.

Further, the removing process of the non-smoke sundries corresponding to the tobacco flakes of each specification comprises the following steps:

a) for two types of tobacco flakes greater than 1.5mm and less than 4.5mm square and greater than 4.5mm and less than 8mm square:

sequentially passing along the conveying direction: removing impurities from a 1 st sticky hair belt, removing impurities from a 1 st pneumatic conveying dust removal pipe, removing impurities from a 2 nd sticky hair belt, performing gravity winnowing for a 1 st time, removing impurities from a 3 rd sticky hair belt, performing gravity winnowing for a 2 nd time, removing impurities from a centrifugal gas-material separator, removing impurities from a 2 nd pneumatic conveying dust removal pipe, removing impurities from a hemp thread removing machine, and removing impurities from a 3 rd pneumatic conveying dust removal pipe;

b) for a square of 8mm above and 20mm below:

sequentially passing along the conveying direction: removing impurities from a 1 st sticky hair belt, removing impurities from a 1 st pneumatic conveying and dedusting pipe, removing impurities from a 2 nd sticky hair belt, performing gravity winnowing for a 1 st time, removing impurities from a 3 rd sticky hair belt, performing gravity winnowing for a 2 nd time, removing impurities from a centrifugal gas-material separator, removing impurities from a 2 nd pneumatic conveying and dedusting pipe, removing impurities from a hemp thread remover, removing impurities from a 3 rd pneumatic conveying and dedusting pipe, and removing impurities from a sticky hair wheel;

c) for stems less than 20mm square:

pass through along direction of conveyance in proper order: removing impurities from the sticky hair belt for the 1 st time, removing impurities from the wind conveying dust removal pipe for the 1 st time, removing impurities from the sticky hair belt for the 2 nd time, performing gravity air separation for the 1 st time, removing impurities from the sticky hair belt for the 3 rd time, and performing gravity air separation for the 2 nd time;

d) for tobacco flakes larger than 20mm and smaller than 60mm square:

sequentially passing along the conveying direction: removing impurities from the wool sticking belt for the 1 st time, removing impurities from the wind conveying and dedusting pipe for the 1 st time, removing impurities from the wool sticking belt for the 2 nd time, performing gravity winnowing for the 1 st time, removing impurities from the wool sticking belt for the 3 rd time, and removing impurities from the wool sticking wheel;

e) for stems less than 60mm square:

sequentially passing along the conveying direction: removing impurities from the sticky hair belt for the 1 st time, removing impurities from the wind conveying dust removal pipe for the 1 st time, removing impurities from the sticky hair belt for the 2 nd time, performing gravity winnowing for the 1 st time, and removing impurities from the sticky hair wheel;

f) for tobacco flakes larger than 60mm square:

sequentially passing along the conveying direction: removing impurities from the fur adhering belt for the 1 st time, removing impurities from the wind conveying dust removal pipe for the 1 st time, removing impurities from the fur adhering belt for the 2 nd time and removing impurities from the fur adhering wheel.

Compared with the prior art, the invention has the beneficial effects that:

1. the technical key is as follows: the full closed-loop type 8-specification tobacco flake separation and classification with the tobacco ash, the dust and the non-smoke impurities is realized. The 4-stage main vibration sieve, the 1-stage branch vibration sieve and the 5-specification screen meshes are matched for application, and the 2-stage gravity winnowing, the gas-material separator, the hemp thread remover, the sticky wool belt, the sticky wool wheel and the like are utilized to realize the fine separation, classification and collection of tobacco flakes and non-tobacco impurities of all sizes in the tobacco leaf scraps, the purity of the obtained tobacco flakes is high, and the availability of 9 classified raw materials is improved; after the materials containing the cigarette ash and dust are conveyed into the cyclone dust collector by the wind power to realize the blanking and collection of the cigarette ash and dust, the materials and the cigarette ash and dust are together guided into the circular vibrating screen of the dust collection room again together with the cigarette ash and dust in the negative pressure dust collection pipe, and the three-stage classification screening and collection of the broken tobacco flakes, the sesame flakes (less than 1.5mm square tobacco flakes) and the cigarette ash and dust are finished again, so that the separation and classification are fine and have no omission, the automatic processing of a closed loop is realized, and the production efficiency is improved; and in closed-loop production, each dust removal process is designed, so that dust pollution is reduced to the minimum, the working environment is improved, and cleanness, environmental protection and sanitation reach high standards.

2. Technical commonality: the problem of eliminating non-smoke impurity hemp velvet yarns is solved in a targeted classification mode. The cigarette processing has zero tolerance to non-tobacco impurities, the content of the non-tobacco impurities in the tobacco scraps is the highest, particularly the hemp thread substances, and the elimination degree and the elimination technical level of the hemp thread substances determine the quality and the applicability of the separated and classified tobacco flakes; for example, if screening and dust removal are not counted for three types of tobacco flakes with 1.5 mm-20 mm square, the technical scheme at least adopts 11 steps with other processes, and at least adopts 5 steps with other processes for tobacco flakes with more than 60mm square; the targeted hemp thread and wool removing process corresponding to each classification is designed, and the removal of non-smoke impurities of hemp thread and wool can be effectively solved. Therefore, compared with the method of removing the tobacco leaves firstly and then classifying or classifying firstly and then removing the tobacco leaves, the method has the advantages that the pertinence and the fineness are higher, the purity of the obtained tobacco leaf raw materials is higher, and the lean production of the tobacco leaves and the improvement of the quality of cigarettes are facilitated.

3. Basic property: the fine dust collection of the ground smoke and dust, and the dustless high-efficiency closed-loop automatic processing. One of the main environmental hygiene difficulties in the tobacco redrying workshop is to treat the pollution of the tobacco ash and dust, obviously, most of the tobacco ash and dust in the redrying workshop are contained in the tobacco scraps, so the transportation, separation, classification and collection of the tobacco ash and dust in the tobacco scraps are important problems of the basis of the technical scheme. In the technical scheme, from the beginning of quantitative feeding, negative pressure dust removal is started, and closed negative pressure conveying pipelines are designed for conveying materials, processing procedures and converting nodes; the dust removal design is classified in a grading way, the dust content is high, the dust is firstly input into a cyclone dust collector to collect the ash and dust in a closed way, then the ash and dust are merged into a negative pressure dust removal pipeline, and finally the dust is collected by a dust collector and a circular vibrating screen of a dust removal room. The tobacco leaf scraps are separated and classified, firstly, the problem of separation of the cigarette ash and dust is solved, the harm to the workshop environment and workers is large, the technical scheme perfectly solves the basic technical problem, the cigarette ash and dust are collected and recycled, and the dustless operation is realized.

4. High processing recovery efficiency and lower labor cost. The automatic degree is high, and each sieve that shakes, each equipment all can be equipped with the control unit, and each negative pressure pipeline parameter index all passes through PLC real time monitoring, and adjustable best processing state at any time effectively practices thrift the human cost.

5. Obvious economic and social benefits. 7 specifications of the recovered tobacco flakes which are larger than 1.5mm square can be returned to the ginseng production line, and the specifications of the recovered tobacco flakes which are smaller than 1.5mm square can be utilized for producing tobacco sheets and finally blended into shreds, so that the cigarette performance is improved; even the recycled ash dust raw material is the best raw material for the blended fertilizer; that is, except for the removed non-smoke impurity hemp velvet wool, other materials can be recycled according to the related technical requirements. Therefore, the technical scheme has remarkable economic and social benefits.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.

FIG. 1 illustrates a principal process flow diagram of an off-line process recovery apparatus and method for fine separation and classification of tobacco scraps in accordance with an embodiment of the present invention;

FIG. 2 shows a schematic structural view of a quantitative feeding platform according to an embodiment of the present invention;

FIG. 3 shows a schematic diagram of the mesh design of each screen of an embodiment of the present invention;

FIG. 4 shows a schematic diagram of the de-burring of the fluff wheel according to an embodiment of the invention;

FIG. 5 shows a schematic diagram of the main operating principle of a hemp thread rejecting machine according to an embodiment of the present invention;

FIG. 6 shows a schematic view of a negative pressure dusting pipe receiver of a tobacco flake ash of an embodiment of the present invention;

FIG. 7 shows a schematic layout of various process steps and process sites of an embodiment of the present invention;

FIG. 8 is a schematic view showing the arrangement of the flow control valves L1-L10 on the dust removal pipe according to the embodiment of the present invention;

FIG. 9 illustrates a schematic representation of the various pneumatic parameters of the primary dust extraction duct portion of an embodiment of the present invention;

fig. 10 shows a schematic representation of the change in diameter of the main portion of the dusting duct of an embodiment of the invention.

Detailed Description

The above and further features and advantages of the present invention are described in more detail below with reference to the accompanying drawings.

In the description of the present invention, it is to be understood that the terms "first", "second" and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implying any number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two unless specifically defined otherwise.

In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

In the present invention, unless otherwise expressly stated or limited, the first feature "on" or "under" the second feature may be directly contacting the first and second features or indirectly contacting the first and second features through an intermediate. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.

As shown in fig. 1, in order to separate, classify and recycle the tobacco fragments collected in the redrying workshop and realize the classification of various tobacco fragment specifications and the elimination of non-tobacco impurities, the off-line processing and recycling device for finely separating and classifying the tobacco fragments of the invention comprises: the device comprises tobacco scraps 1, a quantitative feeding platform 2, a uniform distribution roller 3, a sticky wool belt impurity remover 4, a first belt conveying lifting belt 5, a first-stage vibrating screen two-layer screening device feed end 6, a sticky wool belt impurity remover 7, a first-stage vibrating screen two-layer screening device 8, a first-stage gravity winnowing machine 9, a blanking device 10, a second-stage vibrating screen two-layer screening device feed end 11, a sticky wool belt impurity remover 12, a second-stage vibrating screen two-layer screening device 13, a second-stage gravity winnowing machine 14, a centrifugal gas material separator 15, a hemp thread remover 16, a material gathering conveying belt 17, a second belt conveying lifting belt 18, a third-stage vibrating screen single-layer screening device 19, a fourth-stage vibrating screen two-layer screening device 20, a tobacco sheet collecting outlet 21 larger than 4.5mm and smaller than 8mm square, a cyclone dust collector 22, a dust removing room 23, a circular vibrating screen 24 and the like. The off-line processing production line is arranged in an independent workshop, the length L of the production line (designed according to the U shape) is 9m +9m +6m is 24m, the length and the width of the workshop are at least 36m multiplied by 14m, the occupied area accounts for 1.05 percent of the area of the whole redrying combined workshop, and the workshop also comprises a cyclone dust collector 22, a material preparation site, a finished product storage site and the like. The circular vibrating screen 24 is installed in the independent dust removing room 23, and the dust removing room 23 is connected with the independent workshop through a negative pressure pipeline.

The classification of the tobacco scraps larger than 1.5mm square tobacco flakes is mainly finished by a (4+1) grade vibrating screen (namely a 4 grade main vibrating screen and a 1 grade branch vibrating screen) and a 2 grade gravity winnowing machine, and the classification of the square tobacco flakes smaller than 1.5mm and the tobacco ash is mainly finished by a cyclone dust collector and a circular vibrating screen; the method mainly comprises the steps of removing impurities by a sticky hair belt, removing impurities by a sticky hair wheel and removing impurities by a hemp thread remover.

According to the gist of the present invention: the main procedures (main process) are as follows: the method comprises the following steps of feeding tobacco scraps, screening by a first-stage vibrating screen two layers, screening by a first-stage gravity winnowing machine and a branch single-layer tobacco stem vibrating screen thereof, screening by a second-stage vibrating screen two layers, removing impurities by a second-stage gravity winnowing machine, a centrifugal gas-material separator, a hemp-silk removing machine, screening by a third-stage vibrating screen single layer, screening by a fourth-stage vibrating screen two layers, dedusting by a cyclone dust collector and screening by a circular vibrating screen.

1) Separating, classifying and collecting various tobacco flakes with the square size larger than 1.5 mm:

referring to fig. 1 and 7, the tobacco flakes with the square of more than 60mm are obtained by screening through a first-stage vibrating screen two-layer screening device, the tobacco stems (stems and leaves) with the square of less than 60mm are obtained by winnowing through a first-stage gravity winnowing machine, the tobacco flakes with the square of more than 20mm and less than 60mm are obtained by screening through a second-stage vibrating screen two-layer screening device, the tobacco stems (stems and leaves) with the square of less than 20mm are obtained by winnowing through a second-stage gravity winnowing machine, the tobacco flakes with the square of more than 8mm and less than 20mm are obtained by screening through a third-stage vibrating screen single-layer screening device, and the tobacco flakes with the square of more than 4.5mm and less than 8mm and the tobacco flakes with the square of more than 1.5mm and less than 4.5mm are obtained by screening through a fourth-stage vibrating screen two-layer screening device.

2) Separating, classifying and collecting various tobacco flakes, cigarette ash and dust with the square of less than 1.5 mm:

referring to fig. 1, 2 and 7, the tobacco flakes and the cigarette ash which are obtained by sieving with the first, second and fourth vibrating screen two-

layer sieving devices

8, 13 and 20 and have a square size of less than 1.5mm, and the cigarette ash and the dust which are generated in the inverted trapezoidal dust removing cover of the quantitative feeding platform 2 by 2-1-1, the second belt conveying lifting belt 18 of the third vibrating screen single-layer sieving device and the tobacco flake collecting outlet 21 which is larger than 4.5mm and has a square size of less than 8mm of the fourth vibrating screen two-layer sieving device converge into a negative pressure dust removing pipe and are guided into a dust removing room 23, and then are guided into a circular vibrating screen 24 to separate and classify the tobacco flakes; the tobacco flakes and the tobacco ash with the square size smaller than 1.5mm obtained by the single-layer tobacco stem vibrating screen sieving device 9-1 are separately treated by the tobacco ash collector 9-1-1.

3) The hair sticking wheel impurity removing process of various tobacco sheets with the square size larger than 8mm comprises the following steps:

with reference to figures 1 and 4, in a first stage of vibrating and screening a two-layer screening device 8

At the outlet of square tobacco flakes collected by the screen and larger than 60mm, in a second stage vibrating screen two-layer screening device 13

At the outlet of square tobacco flakes collected by the screen with the size of more than 20mm and less than 60mm, at the third stage of the vibrating screen single-layer screening device 19

At the tobacco flake outlet which is collected by a screen and is larger than 8mm and smaller than 20mm square and the tobacco stem (stem containing leaves) outlet of a single-layer tobacco stem vibrating screen screening device 9-1 below a first-stage gravity winnowing machine, sticky wheel impurity removal devices 8-1, 13-1 and 19-1 are designed for adsorbing and removing non-tobacco impurities such as hemp fibers, fluff and the like, then the tobacco flakes fall into a manual screen to facilitate manual inspection, and finally fall into a tobacco flake collector and a tobacco stem collector.

Specifically, the method comprises the following steps: the process principle of impurity removal of the wool sticking wheel is shown in figure 4:

the figure demonstrates that the tobacco flakes with the square of more than 8mm and less than 20mm freely fall onto the impurity removal device 19-1 of the hair sticking wheel, the existing non-tobacco impurities such as hemp fibers, villi and the like can be automatically adhered in the hair sticking wheel, then the tobacco flakes fall into the manual sieve 19-5 to be convenient for the detection of a worker, and then the tobacco flakes are poured into the tobacco flake collection device 19-2.

4) The wind conveying and dedusting process of the ash and the dust comprises the following steps:

referring to fig. 1, 7, 8, 9 and 10, at the position above the feeding end 6 of the first-stage vibrating screen two-layer screening device (i.e. the end of the first belt conveying lifting belt 5), at the position above the end working point of the gathering conveying belt 17 for removing impurities by the hemp thread removing machine, and at the outlet of one end of the screen drum of the centrifugal gas-material separator 15, wind conveying dust removing pipes 6-1, 15-1 and 17-1 are respectively connected and converged, so that the collected soot, dust and floating scattered crushed smoke are guided into the cyclone 22 through the negative pressure dust removing pipe, the soot and dust 22-1 are separated and collected, the rest are guided into the dust removing room 23 through the negative pressure dust removing pipe, and three types of substances are separated and classified by the circular vibrating screen 24 in the dust removing room 23: 24-1 parts of tobacco flakes (tobacco flakes larger than 1.5mm square), 24-2 parts of cigarette ash and dust and 24-3 parts of sesame flakes (tobacco flakes smaller than 1.5mm square).

In this embodiment, the cyclone 22 is of the type

The pneumatic power of the pneumatic conveying dust removal pipes 6-1, 15-1 and 17-1 is provided, the pneumatic conveying dust removal pipes are used for separating ash and dust 22-1 from materials conveyed by the pneumatic conveying dust removal pipes, and the rest materials are finally conveyed to a circular vibrating screen 24 of a dust removal room 23.

In this example, the circular vibrating screen 24 has model number MA60S888 and serial number U14067-3. The circular vibrating screen 24 has the function of separating and classifying three types of substances, and the main collecting materials are ash and dust 24-2 and sesame flakes (tobacco flakes with the square size of less than 1.5 mm) 24-3. Since the wind power conveying and dust removing pipes 6-1, 15-1 and 17-1 convey materials such as cigarette ash and dust according to negative pressure, after the cyclone dust collector 22 separates the cigarette ash and dust, the remaining materials are sporadic small tobacco flakes and the like, and are guided into the circular vibrating screen 24, meanwhile, sporadic and sporadic tobacco flakes larger than 1.5mm are generated in consideration of the matching and adjusting situation of the pressure difference of air pressure and the air speed with a real-time production line, and are also guided into the circular vibrating screen 24 through each negative pressure pipeline, therefore, the circular vibrating screen 24 has the function of separating the tobacco flakes 24-1, and the collection amount is very small from the application of the embodiment, so that the fine separation and classification degree is very high.

5) The mechanical design and pneumatic technical index design of the negative pressure dust removal pipe and the pneumatic conveying dust removal pipe are as follows:

referring to fig. 9 and 10, the negative pressure dust removal pipes 2-1, 8-3, 13-3, 18-1, 19-1, 20-2 and 21-1 and the air conveying dust removal pipes 6-1, 15-1 and 17-1 have a pressure difference of air pressure of 25 to 35Pa for P1 and a wind speed of 5 to 10m/s for V1; in a wind power conveying dust removal pipe 15-1 of a centrifugal gas-material separator 15, the pressure difference of air pressure is designed to be P2-120-140 Pa, the wind speed is designed to be V2-14-16 m/s, and corresponding air flow control valves L1-L10 are designed; the air pressure difference and the air speed in each pipeline determine the dust removal, air blowing, air separation and separation effects, and influence factors such as the diameter of the pipeline are more, so the specific adjustment is required.

Specifically, in this embodiment, the feed port: 2-1 parts of negative pressure dust removal pipe, 8-3 parts of negative pressure dust removal pipe, 13-3 parts of negative pressure dust removal pipe, 18-1 parts of negative pressure dust removal pipe, 19-3 parts of negative pressure dust removal pipe, 20-2 parts of negative pressure dust removal pipe and 21-1 parts of negative pressure dust removal pipe; the air pressure of the wind conveying and dust removing pipes 6-1 and 17-1 is adjusted to be 25-35 Pa for the pressure difference range P1 and 5-10 m/s for the wind speed range V1 by using corresponding air flow control valves L1, L4, L8, L7, L5, L3, L2 and L10 respectively; in a wind power conveying dust removal pipe 15-1 of the centrifugal gas-material separator 15, an air flow control valve L9 is utilized to adjust the pressure difference range of the air pressure of the centrifugal gas-material separator to be P2-140 Pa, and the wind speed range to be V2-14-16 m/s; in addition, the gravity air separation machines 9 and 14 utilize the air flow control valve L6 to adjust the optimum pressure difference and air speed at the right moment.

The diameters of the feeding branch pipes of the negative pressure dust removal pipes and the feeding branch pipes of the wind power conveying dust removal pipes are uniformly designed to be D1-160-170 mm, the diameters of the rest main pipes D2-D8 are designed to be 300-600 mm, and the feeding branch pipes are subjected to reducing welding treatment.

Referring to FIG. 10, in this embodiment, a negative pressure dust removal pipe 2-1, a negative pressure dust removal pipe 8-3, a negative pressure dust removal pipe 13-3, a negative pressure dust removal pipe 18-1, a negative pressure dust removal pipe 19-3, a negative pressure dust removal pipe 20-2, and a negative pressure dust removal pipe 21-1; the diameters of the wind power conveying dust removal pipe 6-1, the wind power conveying dust removal pipe 17-1 and the pipeline are all designed to be

Diameter of main pipeline

And the diameter-variable welding treatment is carried out, in particular, the air pipes of the

gravity winnowing machines

9 and 14 and the centrifugal gas-material separator 15 are connected according to the specific size.

6) The method comprises the following steps of designing each stage of vibrating screen and separating and classifying the square tobacco flakes smaller than 60mm in the tobacco scraps:

in this embodiment: according to the operation trend of the tobacco scraps, inputting the tobacco flake mixed materials discharged by the first-stage vibrating and screening two-layer screening device 8 and less than 60mm square into a next procedure to complete the first-stage gravity winnowing machine 9 winnowing, and inputting the rest materials into a second-stage vibrating and screening two-layer screening device 13 after tobacco stems are winnowed; inputting the tobacco flake mixed material discharged by the second-stage vibrating screen two-layer screening device 13 and having a square size smaller than 20mm into a second-stage gravity winnowing machine 14 for winnowing, after tobacco stems are winnowed, remaining materials are input into a centrifugal gas-material separator 15 by utilizing air conveying, separating the materials and dust-containing gas, then enabling the separated tobacco flake mixed material to fall into a hemp thread remover 16, and after hemp thread impurity removal and removal, inputting the tobacco flake mixed material into a third-stage vibrating screen single-layer vibrating screening device 16; and inputting the tobacco flake mixed material which is discharged by the third-stage vibrating screen single-layer vibrating screen device 19 and is less than 8mm square into a fourth-stage vibrating screen single-layer vibrating screen device 20 to respectively obtain two types of tobacco flakes which are greater than 1.5mm and less than 4.5mm and greater than 4.5mm and less than 8mm square.

The specific vibrating screen design is as follows:

the first-stage vibrating screen two-layer screening device 8 and the second-stage vibrating screen two-layer screening device 13And the screen meshes of the fourth-stage vibrating screen two-layer screening device 20 are designed to be double-layer, namely, the upper layer is just corresponding to the lower layer, and the screen mesh diameter of the lower layer is uniformly designed

The diameters of the screen holes on the upper layer are different, and the diameter of the screen hole on the upper layer of the first-stage vibrating screen two-layer screening device 8 is designed to be

The diameter of the screen mesh on the upper layer of the second-stage vibrating screen two-layer screening device 13 is designed as

The diameter of the screen mesh on the upper layer of the fourth-stage vibrating screen two-layer screening device 20 is designed as

The screen mesh of the third-stage vibrating screen single-layer vibrating screen device 19 is designed to be a single layer, and the diameter of the screen mesh is designed to be

A single-layer tobacco stem vibrating screen device 9-1 is arranged below the first-stage gravity winnowing machine 9, and the diameter of the screen hole is designed to be

The diameter of the screen holes on each screen is designed as

The center distance S between any two adjacent screen holes is equal, and

namely, it is

When S is 60+ 60/3-80 mm,

and so on.

In this embodiment:

the models of the first and second

gravity winnowing machines

9 and 14 are selected from FXP-3620, and the main function is to winnow out tobacco stems (stalk labels) in tobacco scraps and improve the quality of tobacco flakes; according to the weight of tobacco flakes, the tobacco stems (stems and leaves) are heavier and are separated, in the embodiment, the tobacco stems (stems and leaves) with the square size of less than 60mm are separated in a large amount after being winnowed by the first-stage gravity winnowing machine 9, and in the second-stage gravity winnowing machine 14, the separation amount of the tobacco stems (stems and leaves) with the square size of less than 20mm is very small, so that the tobacco stems (stems and leaves) are necessary options for fine separation.

The type of the centrifugal gas-material separator 15 is selected from LJ-1200, the centrifugal gas-material separator is mainly used for wind-separating and distributing tobacco scraps and the like, wind power is provided by a cyclone dust collector 22, the tobacco scraps and dust-containing gas are separated through a screen mesh of a screen cylinder of the cyclone dust collector, the dust-containing gas enters a wind power conveying dust-removing pipe 15-1, and the tobacco scraps 1 fall into a downstream hemp thread remover for removing impurities 16 through a bottom outlet of the tobacco scraps 1, namely a discharge falling port 16-5 of the centrifugal gas-material separator.

7) Sticky hair belt removing process of hemp fiber fluff of tobacco scraps in first-stage and second-stage vibrating screen

Tobacco leaf fragments 1 are put into the quantitative feeding platform 2, the tobacco leaf fragments are conveyed to the uniform distribution roller 3 in the process of the first-stage vibrating and screening two-layer screening device 8 through the first belt conveying lifting belt 5 to distribute material at one end, the first-stage vibrating and screening two-layer screening device feeding end 6 and the second-stage vibrating and screening two-layer screening device feeding end 11, and sticky wool belt impurity removing devices 4, 7 and 12 are designed so as to adsorb non-smoke impurities such as hemp threads, fluff and the like in tobacco flakes.

8) Impurity removal process of hemp thread removing machine for tobacco scraps smaller than 20mm square

Referring to fig. 5, the hemp thread remover 16 comprises a lower brush roller 16-1, an upper brush roller 16-2, a lower brush roller speed reducing motor 16-3, an upper brush roller speed reducing motor 16-4, a centrifugal gas-material separator discharge drop hole 16-5, a stair 16-6, a hemp thread remover operating platform 16-7 and a hemp thread remover support 16-8. The centrifugal gas-material separator 15 is arranged above the hemp thread remover 16, the centrifugal gas-material separator 15 separates dust-containing gas and materials which are broken tobacco scraps of square tobacco flakes smaller than 20mm, and then the materials are input into the hemp thread remover 16 for removing impurities through a discharge drop port 16-5 of the centrifugal gas-material separator.

In this embodiment, the rated production capacity of the hemp thread removing machine 16 is 3300kg/h, the rated power of the motor is 3.3kw, and the specific working principle is as follows: after the hemp thread removing machine 16 is started, the gathering conveyor belt 17 operates firstly, then the hemp thread removing main machine starts to operate, the material discharged from the discharging drop port 16-5 of the centrifugal gas-material separator is fed into the hemp thread removing machine 16, the material is conveyed on the surface of a tow of a hemp thread removing roller of the upper brush roller 16-2, hemp threads are removed from the lower surface of the material, after the upper layer is removed, the material turns over and enters the lower layer, the lower brush roller 16-1 removes the original upper surface of the material, finally the material subjected to double-layer removal is received by the gathering conveyor belt 17 below, and after the hemp thread removing machine 16 is sent out, the lifting belt 18 is conveyed by a belt and is input into a third-level vibrating screen single-layer screening 19.

9) Dust removal for a metered feed work area

An inverted trapezoidal dust hood 2-1-1 is designed within the range of 800mm right above a quantitative feeding platform 2 to cover a tobacco leaf fragment area on the feeding platform, and a negative pressure dust removal pipe 2-1 is designed at the top of the dust hood 2-1-1, so that cigarette ash and dust generated in feeding are collected into the inverted trapezoidal dust hood 2-1-1, are pumped away through the negative pressure dust removal pipe 2-1 and are finally conveyed to a dust removal room 23.

In the embodiment, referring to fig. 2 specifically, a quantitative feeding platform 2 is designed, the length is designed to be about 3000mm, the width is designed to be about 800mm, the quantitative feeding tobacco fragments 1 are manually operated, the tobacco fragments 1 contain a large amount of tobacco ash and dust, and the tobacco ash and dust can fly off in the feeding and uniform distribution roller material distribution process, so that an inverted trapezoidal dust hood 2-1-1 is designed within the range of 800mm directly above the quantitative feeding platform 2 to cover the tobacco fragments 1 area on the quantitative feeding platform 2, a negative pressure dust removal pipe 2-1 is designed at the top of the dust hood, so that the tobacco ash and dust generated in feeding can be pumped out through the negative pressure dust removal pipe 2-1 and finally conveyed to a dust removal room 23, and the air quality of a working environment is improved.

10) Receiver transfer of less than 1.5mm square tobacco flakes and ash screened by each stage of vibrating screen

FIG. 6 is an exemplary view of the feed end 20-2 of the negative pressure dust removal pipe in this embodiment. Designing a negative pressure dust removal pipe receiver at the feed ends 8-3, 13-3 and 20-2 of the negative pressure dust removal pipes, and enabling the screen mesh diameters of the first-stage vibrating screen two-layer screening device 8, the second-stage vibrating screen two-layer screening device 13 and the fourth-stage vibrating screen two-layer screening device 20 to be equal to

The sieved tobacco flakes and ash with the square of less than 1.5mm are input into a negative pressure dust removal pipeline 20-2 through an inverted trapezoidal feeding hopper 20-2-1 of the receiver.

11) Eliminating non-tobacco impurity hemp velvet yarn corresponding to each tobacco flake specification

The method is a basic and key technology of the technical scheme, has high difficulty, and directly influences the separation and classification quality of tobacco flakes by the corresponding removing process and step of each tobacco flake specification; based on the tobacco scraps generated in the redrying workshop, a great amount of non-tobacco impurities except ash-containing dust are hemp velvet yarns, and the cigarette process has zero tolerance on the non-tobacco impurities; obviously, the smaller the specification and the size of the tobacco flakes are, the more difficult the hemp threads and the wool are to be removed, the more the removing steps are, and the working procedures are complex; the following description will be given, taking the embodiments of the present specification as examples, of the main process steps corresponding to the specifications of each tobacco flake in the removing process as follows:

a) two types of tobacco sheets with the square size of more than 1.5mm and less than 4.5mm and the square size of more than 4.5mm and less than 8mm

The device comprises a 1 st impurity removing device for the sticky hair belt, a 1 st impurity removing device for the wind power conveying dust removal pipe 6-1, a 2 nd impurity removing device for the sticky hair belt, a 7 nd impurity removing device for the sticky hair belt, a 1 st air separation of a gravity air separator 9, a 3 rd impurity removing device for the sticky hair belt, a 2 nd air separation of a gravity air separator 14, a centrifugal air-material separator 15 for impurity removal, a 2 nd impurity removing device for the wind power conveying dust removal pipe 15-1, a hemp thread removing device 16 for impurity removal, a 3 rd air cleaning pipe 17-1 for impurity removal, and manual screening, collection and inspection.

b) Square tobacco flakes larger than 8mm and smaller than 20mm

The device comprises a 1 st impurity removing device for the sticky hair belt, a 1 st impurity removing device for the wind power conveying dust removal pipe 6-1, a 2 nd impurity removing device for the sticky hair belt, a 7 nd impurity removing device for the sticky hair belt, a 1 st air separation of a gravity air separator 9, a 3 rd impurity removing device for the sticky hair belt, a 2 nd air separation of a gravity air separator 14, a centrifugal air-material separator 15 for impurity removal, a 2 nd impurity removing device for the wind power conveying dust removal pipe 15-1, a hemp thread removing device 16 for impurity removal, a 3 rd air conveying dust removal pipe 17-1 for impurity removal, a sticky hair wheel impurity removing device 19-1 for impurity removal, and manual screening collection and inspection.

c) Less than 20mm square tobacco stem

The device comprises a 1 st impurity removing device with a sticky hair belt, a 1 st impurity removing device with a wind conveying dust removal pipe 6-1, a 2 nd impurity removing device with a sticky hair belt, a 7 nd impurity removing device with a sticky hair belt, a 1 st air separation with a gravity air separator 9, a 3 rd impurity removing device with a sticky hair belt, a 12 nd impurity removing device with a sticky hair belt, a 2 nd air separation with a gravity air separator 14, and manual screening, collection and inspection.

d) Square tobacco flakes larger than 20mm and smaller than 60mm

The device comprises a sticky hair belt impurity remover 4 for removing impurities for the 1 st time, a wind power conveying dust removal pipe 6-1 for the 1 st time, a sticky hair belt impurity remover 7 for the 2 nd time, a gravity winnowing machine 9 for the 1 st time, a sticky hair belt impurity remover 12 for the 3 rd time, a sticky hair wheel impurity removal device 13-1 for removing impurities, and a manual screen for collection and inspection.

e) Less than 60mm square tobacco stem

The device comprises a 1 st impurity removing device for a sticky hair belt, a 1 st impurity removing device for a wind power conveying dust removal pipe 6-1, a 2 nd impurity removing device for a sticky hair belt, a 1 st air separation of a gravity air separator 9, a sticky hair wheel impurity removing device 9-2, and manual screening, collection and inspection.

f) Square tobacco flakes larger than 60mm

The impurity removing device 4 for the sticky hair belt for the 1 st time removes impurities, the wind conveying dust removal pipe 6-1 for the 1 st time removes impurities, the impurity removing device 7 for the sticky hair belt for the 2 nd time removes impurities, the impurity removing device 8-1 for the sticky hair wheel removes impurities, and the manual screening, collection and inspection are carried out.

In the above 7 key removing methods for tobacco flake specification, in fact, the vibrating screen also has a separating function, for example, fluff and hemp fibers adhered to the tobacco flake are separated, and the negative pressure dust removal pipe also has a separating function, for example, very light hemp fiber fluff is pumped away through the negative pressure dust removal pipe; secondly, including 8 th tobacco flake specifications with the square size of less than 1.5mm, all the tobacco flakes are collected and inspected by manual sieves, and are routine quality control methods, including collected cigarette ash and dust, and also quality inspection and quality control are carried out, and the purity of each classified tobacco flake reaches a high standard.

The method is put into use and has obvious practical effect, the fine classification degree of the tobacco fragments and the elimination degree of non-tobacco impurities reach the brand new height of the tobacco industry, the guarantee is provided for classification recycling application, the expensive tobacco leaf raw material cost is saved, if the tobacco leaf cost is 30 yuan/kg, the tobacco leaf fragments are counted by 5T per day, one baking season is counted by 150 days, the raw material cost is up to ten million yuan, and therefore, the method has obvious economic benefit; secondly, the elimination degree of non-tobacco impurity hemp velvet wool also reaches a brand new height, for example, the elimination process of two types of tobacco flakes of square more than 1.5mm and less than 8mm comprises 11 steps without vibration screening and negative pressure dust removal, so that the purity of the tobacco flakes is effectively improved; thirdly, the degree of automation is high, the whole line operation is automatic, and only manual feeding, hemp thread cleaning, collection and inspection and the like are needed, so that closed-loop production is realized; and fourthly, the cleanness and the environmental protection sanitation reach high standards, obviously, the tobacco scraps are separated and classified, the cigarette ash and dust pollution is large, the manual work is difficult to control, in the project, each key process step has negative pressure dust removal, the cigarette ash and dust pollution is greatly reduced, and the obvious practical effect is achieved. In a word, as a major project supporting project for the construction of the redrying combined workshop of the Yuxi cigarette factory of the Hongta group, the production line workshop obtains five-star grade certification of national field management, and the combined workshop obtains green building identification certification, and is the only redrying combined workshop project which passes the evaluation in China at present.

The foregoing is merely a preferred embodiment of this invention, which is intended to be illustrative, and not limiting. The structure, the connection mode and the like of all the components in the invention can be changed, and the equivalent transformation and the improvement on the basis of the technical scheme of the invention are not excluded from the protection scope of the invention.

Claims

1. An off-line processing and recycling device for finely separating and classifying tobacco scraps is characterized by comprising a first-stage vibrating screen two-layer screening device (8), a first-stage gravity winnowing machine (9), a second-stage vibrating screen two-layer screening device (13), a second-stage gravity winnowing machine (14), a third-stage vibrating screen single-layer screening device (19) and a fourth-stage vibrating screen two-layer screening device (20) which are sequentially arranged along the conveying main line direction of the tobacco scraps, and further comprising a cyclone dust collector (22) and a circular vibrating screen (24);

screening by a first-stage vibrating screen two-layer screening device to obtain tobacco flakes larger than 60mm square, winnowing by a first-stage gravity winnowing machine to obtain tobacco stems smaller than 60mm square, screening by a second-stage vibrating screen two-layer screening device to obtain tobacco flakes larger than 20mm and smaller than 60mm square, winnowing by a second-stage gravity winnowing machine to obtain tobacco stems smaller than 20mm square, screening by a third-stage vibrating screen single-layer screening device to obtain tobacco flakes larger than 8mm and smaller than 20mm square, and screening by a fourth-stage vibrating screen two-layer screening device to obtain tobacco flakes larger than 4.5mm and smaller than 8mm square and tobacco flakes larger than 1.5mm and smaller than 4.5mm square; the first, second and fourth vibrating screen two-layer screening devices can screen the tobacco flakes and the cigarette ash with the square size less than 1.5 mm;

2. The off-line processing and recycling device for finely separating and classifying the tobacco scraps as claimed in claim 1, wherein the tobacco stalk outlet at the lower part of the first-stage gravity winnowing machine (9) is connected with a single-layer tobacco stalk vibrating screen sieving device (9-1), the single-layer tobacco stalk vibrating screen sieving device (9-1) is used for separating tobacco stalks with the square of less than 60mm and tobacco flake ash with the square of less than 1.5mm, and the tobacco flake ash with the square of less than 1.5mm is guided into an ash collector (9-1-1) for processing.

3. The off-line processing and recycling equipment for finely separating and classifying the tobacco scraps as claimed in claim 2, wherein a quantitative feeding platform (2) is arranged at the starting end of a tobacco scrap conveying main line, and a uniform distribution roller (3) and a first belt conveying lifting belt (5) are sequentially arranged between the quantitative feeding platform (2) and a first-stage vibrating screen two-layer screening device (8) along the conveying main line direction; a centrifugal gas-material separator (15), a hemp thread remover (16), a gathering conveying belt (17) and a second belt conveying lifting belt (18) are sequentially arranged between the second-stage gravity winnowing machine (14) and the third-stage vibrating screen single-layer screening device (19) along the conveying main line direction;

4. An off-line processing and recycling apparatus for finely separating and classifying tobacco scraps according to claim 3, wherein the circular vibrating screen (24) is disposed in a separate dust removing room (23).

5. The off-line processing and recycling equipment for the fine separation and classification of the tobacco scraps according to claim 3, wherein the pressure difference of air pressure is 25-35 Pa and the air speed is 5-10 m/s at the feeding ports of the negative pressure dust removal pipes (2-1, 8-3, 13-3, 18-1, 19-3, 20-2 and 21-1) and the wind power conveying dust removal pipes (6-1, 15-1 and 17-1); in a wind power conveying dust removal pipe (15-1) of the centrifugal gas-material separator (15), the pressure difference of air pressure is 120-140 Pa, and the wind speed is 14-16 m/s.

6. The off-line processing and recycling device for the tobacco scraps with the fine separation and classification as claimed in claim 5, wherein the diameters of the feeding branch pipes of the negative pressure dust removal pipe and the wind power conveying dust removal pipe are 160-170 mm, and the diameter of the main pipe is 250-610 mm.

7. The off-line processing and recycling device for finely separating and classifying the tobacco scraps as claimed in claim 3, wherein the tail end of the uniform distribution roller (3), the feeding end (6) of the first-stage vibrating screen two-layer screening device and the feeding end (11) of the second-stage vibrating screen two-layer screening device are respectively provided with sticky fur belt impurity removers (4, 7 and 12) so as to absorb and remove non-smoke impurities.

8. The off-line processing and recycling equipment for finely separating and classifying the tobacco scraps as claimed in claim 7, wherein the tobacco leaves are respectively provided with a sticking wheel impurity removal device (8-1, 13-1, 19-1, 9-2) at the outlet of the square tobacco leaves larger than 60mm of the first-stage vibrating and sieving two-layer sieving device (8), the outlet of the square tobacco leaves larger than 20mm and smaller than 60mm of the second-stage vibrating and sieving two-layer sieving device (13), the outlet of the single-layer tobacco stem vibrating and sieving device (9-1) below the first-stage gravity winnowing machine, and the tobacco stems are respectively provided with a sticking wheel impurity removal device (8-1, 13-1, 19-1, 9-2) for adsorbing and removing non-smoke impurities.

9. The off-line processing and recycling equipment for finely separating and classifying the tobacco scraps as claimed in claim 2, wherein the first-stage vibrating screen two-layer screening device (8), the second-stage vibrating screen two-layer screening device (13) and the fourth-stage vibrating screen two-layer screening device (20) are upper and lower double-layer screens, and the mesh diameters of the lower-layer screens are all equal to

10. An off-line processing and recycling apparatus for finely separating and classifying tobacco scraps according to claim 9, wherein each of the meshes has a diameter of

The center distance S between any two adjacent meshes is equal, and

11. an off-line processing and recycling method for finely separating and classifying tobacco scraps is characterized in that:

and (3) separating and classifying various tobacco flakes larger than 1.5mm square: according to the conveying direction of tobacco scraps, tobacco flakes larger than 60mm square and tobacco flake mixed materials smaller than 60mm square are separated by a first-stage vibrating screen two-layer screening device (8), the tobacco flake mixed materials smaller than 60mm square are input into a first-stage gravity winnowing machine (9) for air separation of tobacco stems, the remaining materials are input into a second-stage vibrating screen two-layer screening device (13) for separation of tobacco flakes larger than 20mm square and smaller than 60mm square and tobacco flake mixed materials smaller than 20mm square, the tobacco flake mixed materials smaller than 20mm square are input into a second-stage gravity winnowing machine (14) for winnowing, after the tobacco stems are winnowed, the remaining materials are input into a centrifugal gas-material separator (15) by air conveying to separate the tobacco flake mixed materials and dust-containing gas, the separated tobacco flake mixed materials fall into a hemp thread removing machine (16) for impurity removal, the impurity removal is input into a third-stage vibrating screen single-layer screening device (19) for separation of the tobacco flakes larger than 8mm square and smaller than 20mm square and the tobacco flake mixed materials smaller than 8mm square, inputting the tobacco flake mixed material with the square smaller than 8mm into a fourth-stage vibrating screen two-layer screening device (20) to respectively obtain two types of tobacco flakes with the square larger than 1.5mm and smaller than 4.5mm and the square larger than 4.5mm and smaller than 8 mm;

for dust removal: the method comprises the steps of enabling cigarette ash, dust and floating scattered broken cigarettes generated above a material input end of a first-stage vibrating screen two-layer screening device (8), an outlet at one end of a screen drum of a centrifugal gas-material separator (15), and a tail end working point of a material gathering conveying belt (17) behind a hemp thread removing machine (16) to be connected into a wind power conveying dust removing pipe to be led into a cyclone dust collector (22), separating and collecting the dust, and leading other materials into a circular vibrating screen (24) in a dust removing room (23) to be separated and classified.

12. The off-line processing and recycling method for the tobacco scraps with the fine separation and classification as claimed in claim 11, wherein the non-tobacco impurities corresponding to the tobacco scraps with various specifications are removed by the following steps:

b) for a square of 8mm above and 20mm below:

sequentially passing along the conveying direction: 1 st impurity removal of a sticky hair belt, 1 st impurity removal of a wind conveying dust removal pipe, 2 nd impurity removal of the sticky hair belt, 1 st gravity winnowing, 3 rd impurity removal of the sticky hair belt, 2 nd gravity winnowing, impurity removal of a centrifugal gas-material separator, 2 nd impurity removal of the wind conveying dust removal pipe, impurity removal of a hemp thread remover, 3 rd impurity removal of the wind conveying dust removal pipe and impurity removal of a sticky hair wheel;

c) for stems less than 20mm square:

sequentially passing along the conveying direction: removing impurities from the sticky hair belt for the 1 st time, removing impurities from the wind conveying dust removal pipe for the 1 st time, removing impurities from the sticky hair belt for the 2 nd time, performing gravity air separation for the 1 st time, removing impurities from the sticky hair belt for the 3 rd time, and performing gravity air separation for the 2 nd time;

d) for a tobacco flake larger than 20mm and smaller than 60mm square:

e) for stems less than 60mm square:

f) for tobacco flakes larger than 60mm square: