CN114522884B

CN114522884B - Off-line processing recovery equipment and method for finely separating and classifying tobacco scraps

Info

Publication number: CN114522884B
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: 2024-02-06
Anticipated expiration: 2042-02-16
Also published as: CN114522884A

Abstract

The invention is suitable for primary processing of raw materials in a tobacco redrying workshop, and relates to off-line processing recovery equipment and 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 direction of a tobacco scraps conveying main line, and further comprise a cyclone dust collector and a circular vibrating screen. The classification of the square tobacco flakes with the tobacco scraps of more than 1.5mm is mainly finished by adopting a (4+1) level vibrating screen (namely a 4 level main vibrating screen and a 1 level branch vibrating screen) and a two-level gravity winnowing machine, and the classification of the square tobacco flakes with the scraps of less than 1.5mm and the tobacco ash is mainly finished by adopting a cyclone dust collector and a circular vibrating screen; the separation and elimination of non-tobacco sundries hemp thread of tobacco scraps mainly adopts a sticky tape for removing impurities, a sticky wheel for removing impurities and a hemp thread remover for removing impurities, thereby improving the utilization rate and purity of tobacco raw materials.

Description

Off-line processing recovery 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 tobacco redrying workshops, and particularly relates to off-line processing recovery equipment and method for finely separating and classifying tobacco scraps.

Background

In the tobacco industry, tobacco leaf scraps generally refer to mixtures of various tobacco leaves, tobacco shred residues and the like generated in cigarette production, and are also commonly referred to as crushed cigarettes. Aiming at each tobacco leaf scraps produced in a threshing and redrying workshop, the tobacco leaf scraps are complex mixtures, contain precious tobacco leaves and tobacco stems, also contain fiber hemp threads and the like which are harmful to cigarette products, so that the fine separation and classification of the tobacco leaf scraps are always important and difficult points of the tobacco processing industry.

Tobacco leaves purchased from tobacco farmers at each tobacco harvesting station are subjected to refined sorting, strict quality control and the like, but tens of thousands of tons of tobacco leaves purchased each year contain more or less non-tobacco impurities which are strictly forbidden to enter a cigarette process so as to ensure the raw material purity of each cigarette, so that advanced technological means and large-scale manpower and material resources are adopted for rejecting in the processes of redrying, shredding and the like before the cigarettes, and particularly in the redrying process, the non-tobacco impurities mainly comprise 3 types: 1) polystyrene film, metal, insect eggs, insects, sealed bags, tobacco ends, plastic fibers, rubber strips, feathers and wool, 2) cloth pieces, glove pieces, glass, crushed stone, paper scraps, twines, wood chips, cotton linters, 3) non-tobacco plants, broom hair, straw and the like, and others also include unusable tobacco leaves such as mildew smoke, contaminated smoke, green miscellaneous tobacco leaves and the like, and therefore tobacco leaf scraps in redrying workshops are easy to include not only some kinds of the above non-tobacco impurities, but also other things such as dust, dust and falling hair, cotton linters and the like on the body of workers. Therefore, the separation and classification research of tobacco scraps are completed, the technical problems of the basicity and commonality of the tobacco field are the permanent subject for realizing the lean production of tobacco all the time.

Tobacco scraps generated in a redrying workshop are mainly generated by the following links: 1) Crushed tobacco scraps generated when purchased tobacco leaves are conveyed to a redrying workshop for unpacking; 2) Spreading tobacco leaves, grading, and arranging the crushed tobacco scraps generated in the tobacco leaves, and 3) cleaning the crushed tobacco scraps generated in the material preparation area; 4) And cleaning the broken tobacco scraps generated on each production line, each machine or in each pipeline. Obviously, the tobacco scraps are mixed with complex components, and some of the tobacco scraps, such as fiber twines, cotton linters and the like, can not 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 smaller than 1.5mm square are classified into ash and sesame flakes for classification treatment, the ratio of the tobacco flakes with the size of 1.5-60 mm square is the largest, and then the tobacco flakes with the size of more than 60mm square, namely the tobacco flakes with the size of more than 1.5mm square, can be recycled after separation and classification; tobacco flakes smaller than 1.5mm contain other components such as powder and dust, and can be separated and classified into ash and sesame flakes for recycling for other uses such as manufacturing tobacco flakes and the like. Therefore, the fine separation, classification and recovery of the tobacco scraps are obvious in importance to the tobacco processing industry, firstly, the raw material cost is remarkably saved, the separation and classification of the tobacco scraps larger than 1.5mm are realized, the rapid utilization of the production process is facilitated, and the like, secondly, non-smoke impurities are removed, the purity of the tobacco raw materials is ensured, and thirdly, the ash powder is collected, so that the deep processing and the environmental protection are facilitated.

In the past, due to the insufficient strength of scientific research, the treatment of tobacco scraps is often realized by manual screening and manual sorting, the dust is large in environmental pollution, the large-sized tobacco leaves and tobacco stems which are easy to sort and get and the non-smoke impurities which are easy to remove are easy to clean, and the scraps, including small tobacco flakes and the like, are often treated as wastes, and moreover, if 5 tons of tobacco scraps need to be manually screened every day, a large amount of manpower and material resources are required, the difficulty is high, and the environmental pollution is also large; at present, some redrying processes are accompanied by tobacco leaf chip treatment processes, but are generally designed to be accompanied by online treatment processes, such as a redrying production line, for example, the process is also carried out in a Yuxi cigarette factory, scattered tobacco leaves and crushed tobacco leaves generated in each process in the redrying process are collected and classified in real time, the treatment method is difficult to achieve the fine separation, classification and recovery degree of the tobacco leaf chips, and particularly, after the separation and classified collection of tobacco leaves, tobacco stems and tobacco leaves with the stems with larger sizes, for example, tobacco leaves with the sizes larger than 4.5mm square are directly added to the redrying production line, namely, the threshing process returns, and the tobacco leaves with the sizes larger than 1.5mm square are fed into a crushed tobacco drying line for independent treatment; other sort additions, sort recycles, and the like.

In conclusion, the fine separation, classification and processing recovery of tobacco scraps are studied, the method has higher technical difficulty and technological level in the primary processing field of raw materials for redrying tobacco, but has great significance, can obtain remarkable economic benefit and social environment-friendly benefit, improves the utilization rate and purity of the raw materials, realizes the fine production of tobacco and improves the quality of cigarettes, and has popularization and demonstration significance.

Disclosure of Invention

In order to solve the problems of fine separation, classification and recovery of a complex mixture of tobacco scraps collected in a redrying workshop and realize classification of various tobacco flake specifications and rejection of non-tobacco impurities, the invention provides off-line processing recovery equipment and method for fine separation and classification of tobacco scraps, which aim to improve the utilization rate of tobacco raw materials and the purity of the tobacco raw materials, realize the fine production of tobacco and improve the quality of cigarettes.

Aiming at the scheme, the realization is to: 1. more than 60mm square tobacco flakes, 2.more than 20mm less than 60mm square tobacco flakes, 3.more than 8mm less than 20mm square tobacco flakes, 4.more than 4.5mm less than 8mm square tobacco flakes, 5.more than 1.5mm less than 4.5mm square tobacco flakes, 6.less than 1.5mm square tobacco flakes, and 7.less than 60mm square tobacco stems, 8.less than 20mm square tobacco stems, 9.soot dust, the separation and classification of the 9 specifications, including the design of non-tobacco impurities such as hemp threads into an off-line mode, namely into an independent processing production line, are arranged in an independent workshop with dust removal capability, realize closed-loop production line production, ensure dust-free and environmental sanitation of a working place. The classification of the square tobacco flakes with the tobacco scraps of more than 1.5mm is mainly finished by adopting a (4+1) level vibrating screen (namely a 4 level main vibrating screen and a 1 level branch vibrating screen) and a two-level gravity winnowing machine, and the classification of the square tobacco flakes with the scraps of less than 1.5mm and soot dust is mainly finished by adopting a cyclone dust collector and a circular vibrating screen; the separation and elimination of non-tobacco sundries hemp thread of tobacco scraps mainly adopts a sticky tape to remove impurities, a sticky wheel to remove impurities and a hemp thread eliminating machine to remove impurities.

The invention adopts the technical scheme that:

on one hand, the off-line processing recovery equipment for finely separating and classifying 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 direction of a tobacco scraps conveying main line, and further comprises 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 with the square diameter of more than 60mm, carrying out winnowing by a first-stage gravity winnowing machine to obtain tobacco stems with the square diameter of less than 60mm, screening by a second-stage vibrating screen two-layer screening device to obtain tobacco flakes with the square diameter of more than 20mm and less than 60mm, carrying out winnowing by a second-stage gravity winnowing machine to obtain tobacco stems with the square diameter of less than 20mm, screening by a third-stage vibrating screen single-layer screening device to obtain tobacco flakes with the square diameter of more than 8mm and less than 20mm, and screening by a fourth-stage vibrating screen two-layer screening device to obtain tobacco flakes with the square diameter of more than 4.5mm and less than 8mm and tobacco flakes with the square diameter of more than 1.5mm and less than 4.5 mm; the first, second and fourth-stage vibrating screen two-layer screening devices can screen the obtained tobacco flakes and soot smaller than 1.5mm square;

The cyclone dust collector and the circular vibrating screen are used for separating and classifying tobacco flakes, soot and dust which are generated in each working procedure and are smaller than 1.5mm square.

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

Further, a quantitative feeding platform (2) is arranged at the initial end of the tobacco leaf chip conveying main line, and a 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 direction of the conveying main line; a centrifugal gas-material separator (15), a hemp thread removing machine (16), a material collecting conveyor 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 direction of a conveying main line;

the method comprises the steps that a negative pressure dust removing 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 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) and at the square outlet end smaller than 1.5mm of a fourth-stage vibrating screen two-layer screening device, at the square outlet end larger than 4.5mm of a fourth-stage vibrating screen two-layer screening device (20) and smaller than 8mm of a fourth-stage vibrating screen two-layer screening device (20), smoke flakes smaller than 1.5mm square, soot and dust are guided into a circular vibrating screen (24) through the negative pressure dust removing pipe, and three substances are separated by the circular vibrating screen (24): tobacco flakes (24-1), soot (24-2), dust and sesame flakes (24-3);

Wind power conveying dust removing pipes (6-1, 15-1 and 17-1) are respectively arranged above a feeding end (6) of a first-stage vibrating screen two-layer screening device, at an outlet at one end of a screen cylinder of a centrifugal gas-material separator (15) and at the tail end of a material collecting conveyor belt (17), and collected ash and dust and floating scattered smoke are guided into a cyclone dust remover (22) through the wind power conveying dust removing pipes to be separated out by the cyclone dust remover: soot, dust, shredded tobacco and then directed to a circular vibrating screen (24).

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

Further, the pressure difference of air pressure is 25-35 Pa and the wind speed is 5-10 m/s, and the negative pressure dust removing pipes (2-1, 8-3, 13-3, 18-1, 19-3, 20-2, 21-1) and the wind power conveying dust removing pipes (6-1, 15-1, 17-1) are respectively connected with the feeding ports; in a wind power conveying dust removing 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.

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

Further, the tail end of the equalizing 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 a sticky tape impurity remover (4, 7 and 12) so as to adsorb and remove non-smoke impurities.

Further, the outlet of the square tobacco flake with the diameter larger than 60mm of the first-stage vibrating screen two-layer screening device (8), the outlet of the square tobacco flake with the diameter larger than 20mm of the second-stage vibrating screen two-layer screening device (13), the outlet of the tobacco flake with the diameter smaller than 20mm of the third-stage vibrating screen single-layer screening device (19), the outlet of the tobacco flake with the diameter larger than 8mm of the square tobacco flake with the diameter smaller than 20mm of the third-stage vibrating screen single-layer screening device (19) and the outlet of the tobacco stem of the single-layer tobacco stem vibrating screen screening device (9-1) under the first-stage gravity winnowing machine are respectively provided with a sticky hair wheel impurity removing device (8-1, 13-1, 19-1 and 9-2) for adsorbing and removing non-smoke impurities.

Further, 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 allThe diameter of the upper layer screen mesh of the first-stage vibrating screen two-layer screening device (8) is +.>The diameter 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) isThe 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 mesh diameter of the screens of the third-stage vibrating screen single-layer screening device (19) is +.>The diameter of the screen mesh of the single-layer tobacco stalk vibrating screen sieving device (9-1) is +. >

Further, the mesh diameter of each screen isThe center distance S between any two adjacent meshes is equal, and

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

separating and classifying various tobacco flakes with square diameter of more than 1.5 mm: separating tobacco flakes with the diameter larger than 60mm and tobacco flake mixture with the diameter smaller than 60mm by a first-stage vibrating screen two-layer screening device (8), inputting the tobacco flake mixture with the diameter smaller than 60mm into a first-stage gravity winnowing machine (9) for wind separation of tobacco stems, inputting the rest materials into a second-stage vibrating screen two-layer screening device (13) for separating tobacco flakes with the diameter larger than 20mm and smaller than 60mm and tobacco flake mixture with the diameter smaller than 20mm, inputting the tobacco flake mixture with the diameter smaller than 20mm into a second-stage gravity winnowing machine (14) for winnowing, inputting the tobacco flake mixture with the diameter smaller than 20mm into a centrifugal gas-material separator (15) for separating the tobacco flake mixture and dust-containing gas after winnowing, inputting the separated tobacco flake mixture into a hemp thread remover (16) for impurity removal, inputting the separated tobacco flakes with the diameter smaller than 8mm and tobacco flakes with the diameter smaller than 20mm into a third-stage vibrating screen single-layer screening device (19) for separating the tobacco flakes with the diameter smaller than 20mm and tobacco flakes with the diameter smaller than 8mm and the diameter smaller than 4.5mm to obtain tobacco flake mixture with the diameter smaller than 4.5mm and 8mm and larger than 4.5 mm;

For various types of tobacco flakes and soot less than 1.5mm square, the separation classification: screening tobacco flakes and tobacco ash which are smaller than 1.5mm square and are obtained by the first, second and fourth-stage vibrating screen two-layer screening devices (8, 13 and 20) respectively, floating the tobacco flakes and the tobacco ash above the quantitative feeding platform (2), collecting the tobacco ash generated at the inlet end of the third-stage vibrating screen single-layer screening device (19) and the tobacco ash generated at the outlet end of the fourth-stage vibrating screen two-layer screening device (20), leading the tobacco flakes and the tobacco ash into a negative pressure dust removal pipe, leading the tobacco flakes and the tobacco ash into a circular vibrating screen (24), and separating and classifying the tobacco flakes and the tobacco ash; tobacco flakes and soot which are smaller than 1.5mm square and are obtained by the single-layer tobacco stem vibrating screen screening device (9-1) are treated by a soot collector (9-1-1) alone;

for dust removal: the method comprises the steps of introducing soot, dust and floating scattered smoke generated above the material input end of a first-stage vibrating screen two-layer screening device (8), the outlet of one end of a screen cylinder of a centrifugal gas-material separator (15) and the tail end process point of a collecting and conveying belt (17) behind a hemp thread removing machine (16) into a wind power conveying dust removing pipe to be led into a cyclone dust collector (22), separating and collecting dust, and introducing the rest materials into a circular vibrating screen (24) in a dust removing room (23) to be separated and classified.

Further, the process steps for removing non-smoke impurities corresponding to the tobacco flakes of each specification are as follows:

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 passes along the conveying direction: the method comprises the steps of removing impurities from a 1 st sticky tape, removing impurities from a 1 st wind power conveying dust removing pipe, removing impurities from a 2 nd sticky tape, removing impurities from a 1 st gravity air separation, removing impurities from a 3 rd sticky tape, removing impurities from a 2 nd gravity air separation, removing impurities from a centrifugal gas-material separator, removing impurities from a 2 nd wind power conveying dust removing pipe, removing impurities from a hemp thread remover, and removing impurities from a 3 rd wind power conveying dust removing pipe;

b) For tobacco flakes greater than 8mm and less than 20mm square:

sequentially passes along the conveying direction: the method comprises the following steps of 1 st hair adhering belt impurity removal, 1 st wind power conveying dust removing pipe impurity removal, 2 nd hair adhering belt impurity removal, 1 st gravity air separation, 3 rd hair adhering belt impurity removal, 2 nd gravity air separation, centrifugal gas-material separator impurity removal, 2 nd wind power conveying dust removing pipe impurity removal, hemp thread remover impurity removal, 3 rd wind power conveying dust removing pipe impurity removal and hair adhering wheel impurity removal;

c) For tobacco stems less than 20mm square:

sequentially passes along the conveying direction: removing impurities from the 1 st adhesive tape, removing impurities from the 1 st wind power conveying dust removing pipe, removing impurities from the 2 nd adhesive tape, performing gravity air separation for the 1 st time, removing impurities from the 3 rd adhesive tape, and performing gravity air separation for the 2 nd time;

d) For tobacco flakes greater than 20mm and less than 60mm square:

Sequentially passes along the conveying direction: the method comprises the steps of removing impurities from a 1 st adhesive tape, removing impurities from a 1 st wind power conveying dust removing pipe, removing impurities from a 2 nd adhesive tape, carrying out gravity air separation for the 1 st time, removing impurities from the 3 rd adhesive tape, and removing impurities from an adhesive tape wheel;

e) For tobacco stems less than 60mm square:

sequentially passes along the conveying direction: the 1 st time of the hair sticking belt impurity removal, the 1 st time of the wind power conveying dust removal pipe impurity removal, the 2 nd time of the hair sticking belt impurity removal, the 1 st time of gravity air separation and the hair sticking wheel impurity removal;

f) For tobacco flakes greater than 60mm square:

sequentially passes along the conveying direction: the 1 st time of the hair sticking belt is used for removing impurities, the 1 st time of the wind power conveying dust removing pipe is used for removing impurities, the 2 nd time of the hair sticking belt is used for removing impurities, and the hair sticking wheel is used for removing impurities.

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

1. the technical key is as follows: realizing the separation and classification of the full-closed-loop type 8-specification tobacco flakes, ash dust and non-smoke impurities. The 4-level main vibrating screen, the 1-level branch vibrating screen and 5-level standard screen are matched for application, and the 2-level gravity winnowing, the gas-material separator, the hemp thread removing machine, the fur sticking belt, the fur sticking wheel and the like are utilized to realize the fine separation, classification and collection of tobacco flakes and non-smoke impurities in tobacco scraps, so that the purity of the obtained tobacco flakes is high, and the availability of 9 raw materials for classification is improved; after the material containing the ash and the dust is guided into a cyclone dust collector by a wind power conveying dust removing pipe to realize blanking collection of the ash and the dust, the material is guided into a circular vibrating screen of a dust removing room again together with the ash and the dust in a negative pressure dust removing pipe to finish three-level classification screening and collection of crushed tobacco flakes, sesame flakes (square tobacco flakes smaller than 1.5 mm) and the ash and the dust again, and the separation classification is fine and free, so that closed-loop automatic processing is realized, and the production efficiency is improved; the closed-loop production is carried out, each dust removing procedure is designed, dust pollution is reduced to the minimum, the working environment is improved, and the cleaning, environmental protection and sanitation reach high standards.

2. Technical commonality: the difficult problem of removing non-smoke impurity hemp velvet yarns is solved in a targeted classification way. Zero tolerance to non-smoke impurities is achieved in cigarette processing, the highest content of non-smoke impurities in tobacco scraps can be achieved, particularly hemp thread substances are removed, and the quality and applicability of separated and classified tobacco flakes are determined by the removal degree and the removal technical level; for example, three types of tobacco flakes with the square diameter of 1.5 mm-20 mm, such as sieving and dust removal, are not counted, the technical scheme adopts at least 11 different working procedures, the square diameter is larger than 60mm, and at least 5 different working procedures are adopted; the method has the advantages that the specific hemp velvet yarn removing procedures corresponding to the classifications are designed, and the removal of non-smoke impurities of the hemp velvet yarns can be effectively solved. Therefore, compared with the prior art, the method has the advantages that the method has more pertinence, is finer, and is beneficial to the tobacco lean production and the improvement of the quality of cigarettes.

3. Basicity: fine soot and dust collection, and high-efficiency closed-loop automatic processing without dust. One of the major environmental sanitation difficulties in the tobacco redrying workshop is that the tobacco dust pollution is treated, obviously, the tobacco scraps almost contain most of the tobacco dust in the redrying workshop, so that the transportation, separation, classification and collection of the tobacco dust in the tobacco scraps are important problems of the technical scheme. According to the technical scheme, from the beginning of quantitative feeding, negative pressure dust removal is started, and all material conveying, working procedure treatment and conversion nodes are designed into a closed negative pressure conveying pipeline; the dust removal design is classified, the dust content is high, the dust is firstly input into a cyclone dust collector to collect ash and dust in a closed mode, then the dust is integrated 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, the problem of large harm to workshop environment and staff is solved, the basic technical problem is perfectly solved by the technical scheme, the ash and dust are collected and recycled, and dust-free operation is realized.

4. High processing recovery efficiency and lower labor cost. The automatic degree is high, each vibrating screen and each equipment can be provided with a control unit, and each negative pressure pipeline parameter index is monitored in real time through a PLC, so that the optimal processing state can be adjusted at any time, and the labor cost is effectively saved.

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 production line, and the recovered tobacco flakes, which are smaller than 1.5mm square, can be utilized to produce tobacco flakes, finally the tobacco flakes are prepared, and the cigarette performance is improved; even the recovered soot and dust raw material is the best raw material for the ginseng fertilizer; that is, except for the removed non-smoke impurity hemp velvet, other hemp velvet 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 that are needed in the description of the embodiments or the prior art will be briefly described, and it is obvious that the drawings in the description below are some embodiments of the present invention, and other drawings can be obtained according to the drawings without inventive effort for a person skilled in the art.

FIG. 1 shows a main process flow diagram of an off-line processing recovery apparatus and method for finely separating and classifying tobacco leaf 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 screens according to an embodiment of the invention;

FIG. 4 shows a schematic diagram of the principle of the hair-sticking wheel of the embodiment of the invention;

fig. 5 shows a schematic and simplified diagram of the main working principle of the twine remover according to the embodiment of the invention;

fig. 6 shows a schematic view of a negative pressure dust collector for tobacco flake soot according to an embodiment of the present invention;

FIG. 7 shows a schematic diagram of the arrangement of the various process steps and process steps of an embodiment of the invention;

FIG. 8 shows a schematic layout of the flow control valves L1 to L10 on the dust removing pipe according to the embodiment of the present invention;

FIG. 9 illustrates a schematic identification of various pneumatic parameters of a primary dust removal duct section in accordance with an embodiment of the present invention;

fig. 10 shows a schematic drawing of a logo of diameter variation of a main portion of a dust removing pipe according to an embodiment of the present invention.

Detailed Description

The above and further technical 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 should 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 a relative importance or number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In the description of the present invention, the meaning of "plurality" is at least two unless explicitly defined otherwise.

In the present invention, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; either directly or indirectly, through intermediaries, or both, may be in communication with each other or in interaction with each other, unless expressly defined otherwise. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art according to the specific circumstances.

In the present invention, unless expressly stated or limited otherwise, a first feature "up" or "down" a second feature may be the first and second features in direct contact, or the first and second features in indirect contact via an intervening medium. Moreover, a first feature being "above," "over" and "on" a second feature may be a first feature being directly above or obliquely above the second feature, or simply indicating that the first feature is level higher than the second feature. The first feature being "under", "below" and "beneath" the second feature may be the first feature being directly under or obliquely below the second feature, or simply indicating that the first feature is less level than the second feature.

As shown in fig. 1, in order to separate, classify and recycle tobacco scraps collected in a redrying workshop, and to classify various tobacco flake specifications and reject non-tobacco impurities, the off-line processing and recycling device for finely separating and classifying the tobacco scraps of the invention comprises: tobacco scraps 1, a quantitative feeding platform 2, a spreader roll 3, a sticky hair belt impurity remover 4, a first belt conveying lifting belt 5, a first-stage vibrating screen two-layer screening device feeding end 6, a sticky hair 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 feeding end 11, a sticky hair belt impurity remover 12, a second-stage vibrating screen two-layer screening device 13, a second-stage gravity winnowing machine 14, a centrifugal gas separator 15, a hemp thread remover 16, a material collecting conveyor 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 smoke sheet collecting outlet 21 which is more than 4.5mm and less than 8mm square, a cyclone 22, a dust removal 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=9m+9m+6m=24m of the production line is designed (according to the U-shaped design), the length of the workshop is at least 36m multiplied by 14m, the occupied area is about 1.05% of the area of the whole redrying combined workshop, and the workshop also comprises a cyclone dust collector 22, a material preparation place, a finished product storage place and the like. The circular vibrating screen 24 is arranged in the independent dust removal room 23, and the dust removal room 23 is connected with the independent work room through a negative pressure pipeline.

The classification of the square tobacco flakes with the tobacco scraps of more than 1.5mm is mainly finished by adopting a (4+1) level vibrating screen (namely a 4 level main vibrating screen and a 1 level branch vibrating screen) and a 2 level gravity winnowing machine, and the classification of the square tobacco flakes with the scraps of less than 1.5mm and the tobacco ash is mainly finished by adopting a cyclone dust collector and a circular vibrating screen; the separation and elimination of non-tobacco sundries hemp thread of tobacco scraps mainly adopts a sticky tape to remove impurities, a sticky wheel to remove impurities and a hemp thread eliminating machine to remove impurities.

According to the gist of the invention: the main procedures (main process) are as follows: tobacco leaf scrap feeding, first-stage vibrating screen two-layer screening, first-stage gravity winnowing machine and branch line single-layer tobacco stem vibrating screen screening, second-stage vibrating screen two-layer screening, second-stage gravity winnowing machine, centrifugal gas-material separator, hemp thread removing machine impurity removal, third-stage vibrating screen single-layer screening, fourth-stage vibrating screen two-layer screening, cyclone dust removal and circular vibrating screen screening.

1) Separating, classifying and collecting various tobacco flakes with square diameter of more than 1.5 mm:

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

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

referring to fig. 1, 2 and 7, the first, second and fourth-stage vibrating screen two-layer screening devices 8, 13 and 20 respectively screen the obtained tobacco flakes and ash smaller than 1.5mm square, and the ash and dust generated at the second belt conveying lifting belt 18 of the 2-1-stage vibrating screen single-layer screening device and the tobacco flakes collecting outlet 21 of the fourth-stage vibrating screen two-layer screening device larger than 4.5mm and smaller than 8mm square in an inverted trapezoid dust hood of the quantitative feeding platform 2 are led into a negative pressure dust removing pipe, a dust removing room 23 and a circular vibrating screen 24 to separate and classify tobacco flakes; tobacco flakes and soot of less than 1.5mm square obtained by the single-layer tobacco stem vibrating screen screening device 9-1 are treated solely by the soot collector 9-1-1.

3) The process for removing the impurities of the sticky hair wheels of various tobacco flakes with the square diameter of more than 8mm comprises the following steps:

referring to fig. 1 and 4, a first stage shakes and sieves a two-layer sieving device 8The outlet of the square tobacco flakes which are more than 60mm and are collected by the screen is provided with a second-stage vibrating screen and a two-layer screening device 13>The screen mesh is collected at the outlet of the square tobacco flakes with the diameter of more than 20mm and less than 60mm and arranged in the third-stage vibrating screen single-layer screening device 19 >The tobacco flake outlet with the diameter of more than 8mm and less than 20mm and collected by the screen cloth and the tobacco stalk outlet of the single-layer tobacco stalk vibrating screen screening device 9-1 under the first-stage gravity winnowing machine are respectively provided with a sticky hair wheel impurity removing device 8-1, 13-1 and 19-1 for adsorbing and removing non-tobacco impurities such as hemp threads, fluff and the like, and then the tobacco flakes and the fluff fall into the manual screen, so that the manual inspection is facilitated, and finally the tobacco flakes and the tobacco stalk collector fall into.

Specifically: the technological principle of the hair sticking wheel for removing impurities is shown in figure 4:

in the drawing, the tobacco flakes are demonstrated to fall freely to the sticky hair wheel impurity removing device 19-1 at the tobacco flake outlet 19-4 with the square diameter of more than 8mm and less than 20mm, and the existing non-smoke impurities such as hemp threads, fluff and the like can be automatically adhered to the sticky hair wheel, then fall into the manual sieve 19-5 for being convenient for the staff to check, and then are poured into the tobacco flake collecting device 19-2.

4) The wind power 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 feed end 6 of the first-stage vibrating screen two-layer screening device (namely, the end of the first belt conveying lifting belt 5), the position above the end process point of the impurity-removing collecting conveyor belt 17 of the hemp thread remover and the outlet at one end of the screen drum of the centrifugal gas-material separator 15 are respectively connected with wind power conveying dust removing pipes 6-1, 15-1 and 17-1 and are connected with each other, collected ash, dust and floating scattered smoke are led into a cyclone dust collector 22 through a negative pressure dust removing pipeline, the ash and the dust 22-1 are separated and collected, and the rest of the ash is led into a dust removing room 23 through a negative pressure dust removing pipeline, and three substances are separated and classified by using a circular vibrating screen 24 in the dust removing room 23: sheet tobacco (greater than 1.5mm square tobacco sheet) 24-1, soot and dust 24-2, and sesame sheet (less than 1.5mm square tobacco sheet) 24-3.

In the present embodiment, the cyclone 22 is of the typeIt provides the pneumatic power of the wind power conveying dust removing pipes 6-1, 15-1 and 17-1, and has the function of separating the ash and dust 22-1 from the materials conveyed by the wind power conveying dust removing pipes, and finally conveying the rest materials to the circular vibrating screen 24 of the dust removing room 23.

In this embodiment, circular vibrating screen 24 is of the type MA60S888, series U14067-3. The circular vibrating screen 24 has the function of separating and classifying three substances, and ash and dust 24-2 and sesame flakes (the square tobacco flakes smaller than 1.5 mm) 24-3 are the main collecting materials. Since the wind power conveying dust removing pipes 6-1, 15-1 and 17-1 convey the materials such as ash and dust according to the negative pressure, the cyclone dust collector 22 separates the ash and dust, the rest materials such as scattered small tobacco flakes are led into the circular vibrating screen 24, and meanwhile, the sporadic and extremely small tobacco flakes with the diameter of more than 1.5mm are led into the circular vibrating screen 24 through each negative pressure pipeline in consideration of the pressure difference of air pressure and the matching adjustment condition of the wind speed and the real-time production line, so that the circular vibrating screen 24 also has the function of separating the tobacco flakes 24-1, and the collection amount is small from the application of the embodiment, so that the fine separation classification degree is very high.

5) Mechanical design and pneumatic technical index design of a negative pressure dust removal pipe and a wind power transmission dust removal pipe:

referring to fig. 9 and 10, the pressure difference of air pressure is designed to be P1=25-35 Pa, and the wind speed is designed to be v1=5-10 m/s, with respect to the feed ports of the negative pressure dust removing pipes 2-1, 8-3, 13-3, 18-1, 19-1, 20-2, 21-1 and the wind power conveying dust removing pipes 6-1, 15-1 and 17-1; in a wind power conveying dust removing pipe 15-1 of the 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 wind speed in each pipeline determine the effects of dust removal, air delivery, air separation and separation, and influence factors such as pipeline diameter are more, so that specific adjustment is needed.

Specifically, in this embodiment, the feed port: the negative pressure dust removing device comprises a negative pressure dust removing pipe 2-1, a negative pressure dust removing pipe 8-3, a negative pressure dust removing pipe 13-3, a negative pressure dust removing pipe 18-1, a negative pressure dust removing pipe 19-3, a negative pressure dust removing pipe 20-2 and a negative pressure dust removing pipe 21-1; the air pressure difference ranges of the air pressure of the air conveying dust removing pipe 6-1 and the air conveying dust removing pipe 17-1 are adjusted to be P1=25-35 Pa by utilizing corresponding air flow control valves L1, L4, L8, L7, L5, L3, L2 and L10, and the wind speed ranges of the air pressure and the air pressure are respectively v1=5-10 m/s; in the wind power conveying dust removing pipe 15-1 of the centrifugal gas-material separator 15, the air pressure difference range of the air pressure is regulated to P2=120-140 Pa by utilizing the air flow control valve L9, and the wind speed range is V2=14-16 m/s; the gravity air separators 9 and 14 adjust the optimum pressure difference and the wind speed at the appropriate time by using the air flow control valve L6.

The diameters of the feeding branch pipes of the negative pressure dust removing pipes and the wind power conveying dust removing pipes are uniformly designed to be D1=160-170 mm, the diameters D2-D8 of the other main pipes are designed to be 300-600 mm, and the diameter is changed for welding treatment.

Referring to fig. 10, in the present embodiment, a negative pressure dust removing pipe 2-1, a negative pressure dust removing pipe 8-3, a negative pressure dust removing pipe 13-3, a negative pressure dust removing pipe 18-1, a negative pressure dust removing pipe 19-3, a negative pressure dust removing pipe 20-2, a negative pressure dust removing pipe 21-1; the wind power conveying dust removing pipe 6-1, the wind power conveying dust removing pipe 17-1 and the pipeline diameter are all designed asDiameter of main pipeline

And the variable diameter welding treatment, especially the connection treatment of the gravity winnowing machine 9, 14 and the air pipe of the centrifugal air-material separator 15 according to specific size.

6) The method for separating and classifying square tobacco flakes smaller than 60mm in tobacco scraps comprises the following steps of:

in this embodiment: according to the running trend of tobacco scraps, feeding tobacco flake mixed materials which are discharged by the first-stage vibrating screen two-layer screening device 8 and are smaller than 60mm square into a next procedure to finish the air separation of the first-stage gravity winnowing machine 9, and after the tobacco stems are winnowed, feeding the rest materials into the second-stage vibrating screen two-layer screening device 13; the tobacco flake mixed material discharged by the second-stage vibrating screen two-layer screening device 13 and smaller than 20mm square is input into a second-stage gravity winnowing machine 14 for winnowing, after tobacco stems are winnowed, the rest materials are input into a centrifugal gas-material separator 15 by utilizing air conveying, the materials and dust-containing gas are separated, the separated tobacco flake mixed material falls into a hemp thread removing machine 16, and after hemp threads are removed, the separated tobacco flake mixed material is input into a third-stage vibrating screen single-layer vibrating screen device 16; and inputting the tobacco flake mixture material which is discharged by the third-stage vibrating screen single-layer vibrating screen device 19 and is smaller than 8mm square into a fourth-stage vibrating screen single-layer vibrating screen device 20 to obtain two types of tobacco flakes which are larger than 1.5mm and smaller than 4.5mm and larger than 4.5mm and smaller than 8mm square respectively.

The specific vibrating screen is designed as follows:

the sieves 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 are all designed into double layers, namely the upper layer is opposite to the lower layer, and the diameter design of the sieve holes of the lower layer is uniformly designed intoThe diameters of the screen holes of the upper layer are different, and the diameters of the screen holes of the upper layer of the first-stage vibrating screen two-layer screening device 8 are designed to be +.>The diameter of the screen holes on the upper layer of the second-stage vibrating screen two-layer screening device 13 is designed asThe diameter of the screen holes on the upper layer of the fourth-stage vibrating screen two-layer screening device 20 is designed to be +.>The screen 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 holes is designed to be +.>A single-layer tobacco stem vibrating screen screening device 9-1 is arranged below the first-stage gravity winnowing machine 9, and the diameter of a screen hole is designed to be +.>The diameter of the screen holes on each screen is designed asThe center distance S between any two adjacent screen holes is equal, and +.>I.e. < ->When s=60+60/3=80 mm, +.> And so on.

In this embodiment:

the types of the first-stage gravity winnowing machine 9 and the second-stage gravity winnowing machine 14 are selected from FXP-3620, and the main function is to winnow out tobacco stems (stem sticks) in tobacco scraps, so that the quality of tobacco flakes is improved; it comes the wind according to the size of tobacco flake weight, and the tobacco stalk (including leaf) is heavier, will be separated, in this embodiment, after the selection by winnowing of first level gravity selection by winnowing machine 9, is less than 60mm square tobacco stalk (including leaf) and is separated by a large amount, in second level gravity selection by winnowing machine 14, less than 20mm square tobacco stalk (including leaf) separation volume has been very little, and it is the essential option of fine separation.

The type of the centrifugal gas-material separator 15 is selected from LJ-1200, the main function of the centrifugal gas-material separator is that the centrifugal gas-material separator is used for distributing tobacco scraps and the like in a wind way, the cyclone dust remover 22 provides wind power, the screen mesh of a screen drum of the centrifugal gas-material separator separates the tobacco scraps and dust-containing gas, the dust-containing gas enters the wind power conveying dust removing pipe 15-1, and the tobacco scraps 1 fall into the impurity removing machine 16 of downstream equipment from the bottom outlet, namely a discharging falling port 16-5 of the centrifugal gas-material separator.

7) Technology for removing sticky tape of hemp thread fluff of tobacco scraps in first-stage second-stage vibrating screen

The tobacco scraps 1 are put into the quantitative feeding platform 2, and conveyed to a distributing end of a distributing roller 3 in the process of a first-stage vibrating screen two-layer screening device 8 through a first belt conveying lifting belt 5, a feeding end 6 of the first-stage vibrating screen two-layer screening device and a feeding end 11 of a second-stage vibrating screen two-layer screening device are respectively designed to be sticky tape impurity removers 4, 7 and 12 so as to adsorb non-smoke impurities such as twines, fluff and the like in tobacco flakes.

8) Hemp thread removing machine impurity removing process 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 gear motor 16-3, an upper brush roller gear motor 16-4, a centrifugal air-material separator discharging drop port 16-5, a stair 16-6, a hemp thread remover operation platform 16-7 and a hemp thread remover bracket 16-8. The centrifugal gas-material separator 15 is arranged above the hemp thread removing machine 16, the centrifugal gas-material separator 15 separates dust-containing gas and materials, the materials are broken tobacco scraps smaller than 20mm square tobacco scraps, and then the materials are input into the hemp thread removing machine 16 for impurity removal through a discharge falling port 16-5 of the centrifugal gas-material separator.

In this embodiment, the hemp thread removing machine 16 has a rated capacity of 3300kg/h and a rated power of 3.3kw, and the specific working principle is as follows: after starting the hemp thread removing machine 16, the summarizing and conveying belt 17 runs first, then the hemp thread removing host starts to run, the material at the discharging and falling port 16-5 of the centrifugal air-material separator enters the hemp thread removing machine 16, the material is conveyed on the surface of the hemp thread removing roller tow of the upper brush roller 16-2, hemp threads are removed on the lower surface of the material, after the upper layer is finished, the material enters the lower layer after being overturned, 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 summarizing and conveying belt 17 below, and after the material is sent out of the hemp thread removing machine 16, the material is conveyed by the belt conveying and lifting belt 18 and is input into the third-stage vibrating screen single-layer screening 19.

9) Dust removal of quantitative feeding working area

In the range of 800mm right above the quantitative feeding platform 2, an inverted trapezoid dust hood 2-1-1 is designed to cover a tobacco leaf chip 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 to collect soot and dust generated in feeding into the inverted trapezoid dust hood 2-1-1, and the soot and dust are pumped out through the negative pressure dust removal pipe 2-1 and finally conveyed to a dust removal room 23.

In this embodiment, referring specifically to fig. 2, a quantitative feeding platform 2 is designed, the length is designed to be about 3000mm, the width is designed to be about 800mm, since quantitative feeding tobacco scraps 1 are made of manpower, the tobacco scraps 1 contain a large amount of soot and dust, and since the soot and dust can be generated in the feeding and distributing roller distributing process, an inverted trapezoid dust hood 2-1-1 is designed to cover the tobacco scraps 1 area on the quantitative feeding platform 2 within 800mm above the quantitative feeding platform 2, and a negative pressure dust pipe 2-1 is designed at the top of the dust hood, so that the soot and dust generated in feeding are pumped out through the negative pressure dust pipe 2-1 and finally conveyed to a dust removal room 23, and meanwhile, the air quality of the working environment is also improved.

10 Less than 1.5mm square tobacco flake and ash receptacle transfer for each stage of vibrating screen screening

Fig. 6 is an exemplary view of the feed end 20-2 of the negative pressure dust removing pipe in this embodiment. At the feed ends 8-3, 13-3 and 20-2 of the negative pressure dust removing pipes, negative pressure dust removing pipe receivers are designed, and the diameters of the screen holes 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 are as followsThe screened tobacco flakes and ash smaller than 1.5mm square are fed by the inverted trapezoid body of the receiver The hopper 20-2-1 is input into the negative pressure dust removing pipeline 20-2.

11 Process for removing non-tobacco sundries hemp thread corresponding to each tobacco flake specification

The non-tobacco sundry hemp thread type removing of tobacco scraps is a fundamental and key technology of the technical scheme, has great difficulty, and the removing procedure and the working step corresponding to each tobacco flake specification directly affect the separation and classification quality of the tobacco flakes; based on tobacco scraps generated in a redrying workshop, besides ash dust, a large amount of non-tobacco impurities are hemp floss types, and the cigarette process is zero-tolerant to the non-tobacco impurities; obviously, the smaller the specification and the size of the tobacco flakes, the more difficult the hemp velvet yarns are to be removed, the more steps are needed for removing, and the process is complicated; the following will take examples of the present specification as an example, and the following will describe the main steps corresponding to each tobacco flake specification in the rejecting step:

a) Two types of tobacco flakes with a diameter greater than 1.5mm and less than 4.5mm square and a diameter greater than 4.5mm and less than 8mm square

The 1 st time is to glue the impurity removal of the hair belt, 4, 1 st time wind power and transport the dust removal pipe 6-1 to remove the impurity, 2 nd time is to glue the impurity removal of the hair belt, 7 to remove the impurity, 1 st time gravity winnowing machine 9 winnowing, 3 rd time is to glue the impurity removal of the hair belt, 12 to remove the impurity, 2 nd time gravity winnowing machine 14 winnowing, 15 to remove the impurity of centrifugal gas material separating machine, 2 nd time wind power and transport the dust removal pipe 15-1 to remove the impurity, 16 to remove the impurity of the hemp silk removing machine, 3 rd time wind power and transport the dust removal pipe 17-1 to remove the impurity, manual sieve collection inspection.

b) Square tobacco flake with diameter more than 8mm and less than 20mm

The 1 st time of the impurity removal of the sticky tape impurity remover 4, the 1 st time of the impurity removal of the wind power conveying dust removal pipe 6-1, the 2 nd time of the impurity removal of the sticky tape impurity remover 7, the 1 st time of the air separation of the gravity air separator 9, the 3 rd time of the impurity removal of the sticky tape impurity remover 12, the 2 nd time of the air separation of the gravity air separator 14, the 15 impurity removal of the centrifugal gas-material separator, the 15-1 impurity removal of the 2 nd time of the wind power conveying dust removal pipe, the 16 impurity removal of the hemp silk removing machine 16, the 3 rd time of the impurity removal of the wind power conveying dust removal pipe 17-1 impurity removal of the sticky tape impurity removing device 19-1 impurity removal, the manual screening and collecting inspection.

c) Tobacco stem smaller than 20mm square

The 1 st time is to glue the hair area and remove the impurity 4, 1 st time wind power and carry the dust removal pipe 6-1 to remove the impurity, 2 nd time is to glue the hair area and remove the impurity 7, 1 st time gravity air separator 9 selection by winnowing, 3 rd time is to glue the hair area and remove the impurity 12, 2 nd time gravity air separator 14 selection by winnowing, the manual sieve is collected and inspected.

d) Square tobacco flake with diameter more than 20mm and less than 60mm

The 1 st time of the impurity removal device 4 for the sticky tape, the 1 st time of the wind power conveying dust removal pipe 6-1 for removing impurities, the 2 nd time of the impurity removal device 7 for the sticky tape, the 1 st time of the gravity winnowing machine 9 for winnowing, the 3 rd time of the impurity removal device 12 for the sticky tape, the 13-1 impurity removal device for the sticky tape wheel for removing impurities, and the manual screening for collecting and checking.

e) Tobacco stem smaller than 60mm square

The 1 st time of the impurity removal device 4 for the sticky tape is used for removing impurities, the 1 st time of the wind power conveying dust removal pipe 6-1 is used for removing impurities, the 2 nd time of the impurity removal device 7 for the sticky tape is used for removing impurities, the 1 st time of the gravity winnowing machine 9 is used for winnowing, the sticky wheel impurity removal device 9-2 is used for removing impurities, and the manual screening is used for collecting and checking.

f) Square tobacco flake with diameter greater than 60mm

The 1 st time of the sticky tape impurity remover 4 removes impurities, the 1 st time of the wind power conveying dust removal pipe 6-1 removes impurities, the 2 nd time of the sticky tape impurity remover 7 removes impurities, the sticky tape wheel impurity removing device 8-1 removes impurities, and the manual screening is used for collecting and checking.

The above 7 methods are key removing methods of the specification of the tobacco flakes, in fact, the vibrating screen has a separating function, such as separating fluff and hemp threads adhered on the tobacco flakes, and the negative pressure dust removing pipe has a separating function, such as pumping light hemp thread fluff through the negative pressure dust removing pipe; secondly, including 8 th tobacco flake specifications less than 1.5mm square, manual screening, collection and inspection are all routine quality control methods, including collected soot and dust, quality inspection and quality control are also carried out, and the purity of each classified tobacco flake has reached a very high standard.

The method has obvious effect, the fine classification degree of the tobacco scraps and the rejection degree of non-smoke impurities reach the full new height of the tobacco industry, the method provides guarantee for classified recycling application, and saves the expensive tobacco raw material cost, if the tobacco cost is 30 yuan/kg, the tobacco scraps are 5T per day, and the raw material cost is 150 days per baking season, so that the method has remarkable economic benefit; secondly, the degree of removing the non-smoke impurity hemp velvet type is completely new, for example, the removing procedure of two types of tobacco flakes with the size of more than 1.5mm and less than 8mm is adopted, and 11 steps are included without vibration sieve and negative pressure dust removal, so that the purity of the tobacco flakes is effectively improved; thirdly, the automation degree 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; fourth, clean and environmental protection health reaches high standard, obviously, tobacco leaf piece separation classification, and soot dust pollution is big, and the manual work is difficult to control, and in this project, each key process step point has the negative pressure dust removal, greatly reduces soot dust pollution, has obvious actual effect. In a word, as a major engineering matched project of the construction of a redrying combined workshop of a red tower group Yuxi cigarette factory, a production line workshop obtains five-star-level authentication of national field management, and the combined workshop obtains green building identification authentication, so that the method is the only project of the redrying combined workshop passing the evaluation in China at present.

The foregoing description of the preferred embodiment of the invention is merely illustrative of the invention, and is not intended to be limiting. The structure, connection mode and the like of each component in the invention can be changed, and all equivalent changes and improvements performed on the basis of the technical scheme of the invention are not excluded from the protection scope of the invention.

Claims

1. The off-line processing recovery 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 direction of a tobacco scraps conveying main line, and further comprising a cyclone dust collector (22) and a circular vibrating screen (24);

The cyclone dust collector and the circular vibrating screen are used for separating and classifying tobacco flakes, soot and dust which are generated in each working procedure and are smaller than 1.5mm square;

a quantitative feeding platform (2) is arranged at the initial end of the tobacco leaf chip conveying main line, and a 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 direction of the conveying main line; a centrifugal gas-material separator (15), a hemp thread removing machine (16), a material collecting conveyor 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 direction of a conveying main line;

2. An off-line process recycling apparatus for fine separation of classified tobacco scraps according to claim 1, characterized in that the circular vibrating screen (24) is arranged in a separate dust removal room (23).

3. An off-line processing and recycling device for finely separating and classifying tobacco scraps according to claim 1, wherein the pressure difference of air pressure is 25-35 Pa and the wind speed is 5-10 m/s, and the feeding ports of each negative pressure dust removing pipe (2-1, 8-3, 13-3, 18-1, 19-3, 20-2, 21-1) and each wind power conveying dust removing pipe (6-1, 15-1, 17-1); in a wind power conveying dust removing 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.

4. An off-line processing and recycling device for finely separating and classifying tobacco scraps as claimed in claim 3, wherein the diameter of the feeding branch pipe of each negative pressure dust removing pipe and the wind power conveying dust removing pipe is 160-170 mm, and the diameter of the main pipe is 250-610 mm.

5. An off-line processing and recycling device for finely separating and classifying tobacco scraps according to claim 1, wherein the tail end of the equalizing 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 a sticky tape impurity remover (4, 7, 12) so as to adsorb and remove non-smoke impurities.

6. An off-line processing and recycling device for finely separating and classifying tobacco scraps as claimed in claim 5, wherein the sticky wheel impurity removing devices (8-1, 13-1, 19-1, 9-2) are arranged at the outlet of the square tobacco scraps with the diameter larger than 60mm of the first-stage vibrating screen two-layer screening device (8), the outlet of the square tobacco scraps with the diameter larger than 20mm and smaller than 60mm of the second-stage vibrating screen two-layer screening device (13) and the outlet of the tobacco scraps with the diameter larger than 8mm and smaller than 20mm of the third-stage vibrating screen single-layer screening device (19) respectively.

7. An off-line processing and recycling device for finely separating and classifying tobacco scraps as claimed in claim 1, 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 respectively The diameter of the upper layer screen mesh of the first-stage vibrating screen two-layer screening device (8) is +.>The diameter of the upper layer screen mesh of the second-stage vibrating screen two-layer screening device (13) is +.>The diameter 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) is a single-layer screen, and the mesh diameter of the screen of the third-stage vibrating screen single-layer screening device (19) is

8. An off-line process recycling apparatus for finely separating and classifying tobacco leaf chips as recited in claim 7, wherein each of said screens has a mesh diameter ofThe center distance S between any two adjacent meshes is equal and +.>

9. An off-line processing recovery method for finely separating and classifying tobacco scraps is characterized by comprising the following steps of: an off-line process recycling facility employing the fine separation classification tobacco leaf chips of claim 2;

For various types of tobacco flakes and soot less than 1.5mm square, the separation classification: screening tobacco flakes and tobacco ash which are smaller than 1.5mm square and are obtained by the first, second and fourth-stage vibrating screen two-layer screening devices (8, 13 and 20) respectively, floating the tobacco flakes and the tobacco ash above the quantitative feeding platform (2), collecting the tobacco ash generated at the inlet end of the third-stage vibrating screen single-layer screening device (19) and the tobacco ash generated at the outlet end of the fourth-stage vibrating screen two-layer screening device (20), leading the tobacco flakes and the tobacco ash into a negative pressure dust removal pipe, leading the tobacco flakes and the tobacco ash into a circular vibrating screen (24), and separating and classifying the tobacco flakes and the tobacco ash;

10. The method for off-line processing and recycling of fine-separation and classification tobacco scraps as recited in claim 9, wherein the step of removing non-tobacco scraps corresponding to each specification of tobacco scraps is as follows:

b) For tobacco flakes greater than 8mm and less than 20mm square:

c) For tobacco stems less than 20mm square:

d) For tobacco flakes greater than 20mm and less than 60mm square:

e) For tobacco stems less than 60mm square:

f) For tobacco flakes greater than 60mm square: