CN110947513A - Reconstituted tobacco raw material pretreatment process and system - Google Patents

Reconstituted tobacco raw material pretreatment process and system Download PDF

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Publication number
CN110947513A
CN110947513A CN201911259777.9A CN201911259777A CN110947513A CN 110947513 A CN110947513 A CN 110947513A CN 201911259777 A CN201911259777 A CN 201911259777A CN 110947513 A CN110947513 A CN 110947513A
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China
Prior art keywords
tobacco
equipment
machine
screen
screw conveyor
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CN201911259777.9A
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CN110947513B (en
Inventor
邢振雷
赵敏
侯天伟
牟致远
耿玉晓
李相鹏
马知行
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Shandong Ruibosi Tobacco Co ltd
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Shandong Ruibosi Tobacco Co ltd
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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B03SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
    • B03BSEPARATING SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS
    • B03B9/00General arrangement of separating plant, e.g. flow sheets
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B65CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65GTRANSPORT OR STORAGE DEVICES, e.g. CONVEYORS FOR LOADING OR TIPPING, SHOP CONVEYOR SYSTEMS OR PNEUMATIC TUBE CONVEYORS
    • B65G33/00Screw or rotary spiral conveyors
    • B65G33/08Screw or rotary spiral conveyors for fluent solid materials
    • B65G33/14Screw or rotary spiral conveyors for fluent solid materials comprising a screw or screws enclosed in a tubular housing

Abstract

The invention relates to a paper-making method reconstituted tobacco raw material pretreatment process method, which adopts a three-head one-tail treatment process, and comprises three feeding treatment process sources and one weighing and packaging process tail; the three feeding treatment processes are a tobacco leaf/tobacco flake treatment process, a tobacco rod treatment process and a tobacco soil/tobacco powder treatment process; the invention obviously reduces the large fragment rate and the breakage rate of the tobacco leaf raw materials; the crushing quality of the tobacco soil rod is improved, the waste is reduced, and the yield of the tobacco leaf raw material is greatly improved; the dust content in the raw material screening process is low, the operation environment is good, and the whole line dust removal effect is good; the whole line process equipment has reasonable design, small occupied area and concise layout; the control is accurate, the energy consumption is low, the performance of the equipment can be fully exerted, and the material treatment effect and the equipment operation efficiency are improved; the screen used by the treatment process can be flexibly replaced, and screens with different screen hole sizes can be selected according to customer requirements, so that individualized requirement treatment of materials is realized.

Description

Reconstituted tobacco raw material pretreatment process and system
Technical Field
The invention belongs to the field of reconstituted tobacco, and particularly relates to a process method for pretreating reconstituted tobacco raw materials.
Background
The information in this background section is only for enhancement of understanding of the general background of the invention and is not necessarily to be construed as an admission or any form of suggestion that this information forms the prior art that is already known to a person of ordinary skill in the art.
The reconstituted tobacco is prepared by processing raw materials such as tobacco stems, tobacco leaves/tobacco flakes, tobacco powder/tobacco soil, tobacco rods and the like which are abandoned in the cigarette process and the tobacco redrying process according to the technical standard of the reconstituted tobacco raw materials; extracting qualified raw materials with water, performing solid-liquid separation, concentrating the liquid in a concentration process, evaporating and concentrating, retaining the tobacco active ingredients with a certain concentration, and perfuming to obtain a coating liquid; the solid enters a pulping process, and paper base is manufactured by pulp making; and backfilling the coating liquid into the paper base, and recombining into the reconstituted tobacco.
The current situation is as follows: because the tobacco leaves in the tobacco raw materials are different in size, the tobacco stems are different in length, the tobacco powder and tobacco soil particles are different in size, the tobacco rod is of a block structure, the raw materials are doped with hemp ropes, metal, gravels, dust and other impurities, the raw materials are crushed, screened and used, and then enter subsequent procedures of feeding, extracting and the like, the raw material treatment does not reach the standard, the subsequent equipment operation and the process product quality are affected, and meanwhile, part of the impurities also enter subsequent extracting solution, concentrated solution and pulp, and the finished product quality and the yield are affected.
In the prior raw material pretreatment process, a tobacco rod is treated by a two-stage crusher and a two-stage vibrating screening machine; the tobacco powder raw material is directly subjected to two-stage screening treatment; the tobacco leaves and the tobacco flakes are treated by crushing and screening by a threshing machine.
The drawbacks of the prior art are as follows:
1. the existing raw material treatment process is simple, and the problems of blockage of conveying equipment and pipelines, faults of pulping equipment and the like in the production process due to the fact that the physical characteristics and components of the tobacco raw materials are complex are not considered, so that the operation efficiency of the equipment is seriously influenced.
2. According to investigation, the large-piece rate of tobacco leaves and tobacco flakes is 5.1 percent, and the raw materials are seriously crushed in the treatment process; the dust is serious in the process of crushing and screening the tobacco soil rod; resulting in low raw material yield and serious waste.
Disclosure of Invention
The invention provides a pretreatment process method of a paper-making reconstituted tobacco raw material for finely treating the reconstituted tobacco raw material.
In order to achieve the technical purpose, the technical scheme adopted by the invention is as follows:
a papermaking method reconstituted tobacco raw materials pretreatment systems includes: the tobacco leaf/tobacco flake feeding machine, the tobacco rod feeding machine, the tobacco soil/tobacco powder feeding machine, the vibration screening machine, the first-level linear vibration screen, the second-level linear vibration screen, the screw conveyor I, the cache bin and the weighing bagging and packaging machine; the vibration screening machine, the first-stage linear vibration screen, the second-stage linear vibration screen, the screw conveyor I, the buffer storage bin and the weighing bagging and packaging machine are sequentially connected; the tobacco leaf/tobacco flake feeding machine is sequentially connected with the threshing machine, the belt conveyor, the iron remover I, the winnowing machine and the vibration screening machine; the tobacco rod feeding machine is sequentially connected with a primary crusher, a screw conveyor I, a secondary crusher, an iron remover II, a secondary screw conveyor, an iron remover III and the vibration screening machine; the tobacco soil/tobacco powder feeding machine is sequentially connected with the primary screw conveyor and the secondary screw conveyor.
Three ends and one tail: the raw materials suitable for the reconstituted tobacco mainly comprise tobacco stems, tobacco leaves, tobacco flakes, tobacco rods and tobacco soil/tobacco powder, the raw materials are required to be processed before being put into use, the raw material technical standard of reconstituted tobacco processing is met, and the raw materials are put into the production flow of the reconstituted tobacco according to the formula of the reconstituted tobacco raw materials.
Traditional initial raw materials processing mainly is to corresponding process equipment of one of them material configuration, and above 5 kinds of material processing just need dispose 5 raw materials processing production lines, the drawback that exists: firstly, the process equipment is complex and the investment amount is large; secondly, the occupied area is large, and meanwhile, the matched equipment of a dust removal system is added; thirdly, the equipment is more, so that the energy consumption and the subsequent equipment maintenance cost are increased; fourthly, more operators are configured, and the cost of human resources is increased; fifthly, the equipment utilization rate is low.
Three heads and one tail are characterized in that:
according to the characteristics of the five materials and the technical standard requirements of the tobacco sheet raw materials, in the material treatment process, the partial process treatments of the five treatment lines have commonality and can be integrally treated. The process of the designed raw material treatment process system can be divided into three treatment stages, wherein in the initial stage, different materials are respectively fed from three feeding ports, and the materials are subjected to primary crushing and screening processing by being provided with special equipment; in the middle stage, the common material treatment process is integrated into one treatment line, common equipment is designed and configured, and parts of the common equipment can be flexibly replaced to adapt to different materials for finish machining of the materials; and at the end stage, classifying, screening and packaging different materials. The screening and packaging process at the tail of three feeding sources is realized.
In some embodiments, the two secondary linear vibrating screens and the screw conveyor I are arranged in parallel. The design process can be used for processing five materials respectively, integrates a plurality of traditional treatment processes into one treatment process, and has the advantages of reasonable whole-line process equipment design, low investment, small occupied area, concise process layout and high treatment efficiency.
In some embodiments, the air classifier is further coupled to a bagging apparatus. The air separator has two exports, and export on equipment upper portion and the export of equipment lower part, the export of equipment upper portion be the export of the available material that obtains after the screening, and the export of lower part is the heavier offal and the impurity of wind escape, and the impurity material is handled through the bagging-off, and the export material of upper portion gets into the further fine-grained processing of second grade breaker.
The working operation mode of the winnowing machine is as follows: the rotating speed of the winnowing machine is flexibly controlled and the air quantity is adjusted by adjusting the parameters of a frequency converter of the winnowing machine, and available lighter tobacco leaf materials and heavier impurity materials such as heavier tobacco stems are screened out by wind power to be separated out for bagging treatment.
In some embodiments, the primary linear vibrating screen is further coupled to bagging equipment. Primary linear vibrating screen: the design the inside is shaken to the straight line and is sieved two-layer design, also can set up the multilayer design according to the demand, and the straight line shakes and sieves inside change over switch that sets up, according to the material size technical requirement of handling, control change over switch, selects to sieve upper strata or lower floor's material. Compared with the traditional rocker arm type vibrating screen machine, the linear vibrating screen has the advantages of low noise, low failure rate, high treatment efficiency, high screening precision, low energy consumption, long service life of the screen, good sealing property, less dust scattering and overflow and convenient maintenance.
In some embodiments, the linear vibratory screening two-layer design of the present application, the first layer is equipped with 63 mesh screens, the second layer is equipped with 64 pneumatic transfer switches a, 65 foreign material outlets a, 66 pneumatic transfer switches B, 67 foreign material outlets B, 68 material inlets, 69 usable material outlets a, 70 usable material outlets B. And a multilayer design can be set according to requirements, and materials on the upper layer or the lower layer are selected and screened according to the technical requirements of the size of the processed materials. As shown in fig. 4.
In some embodiments, the second-stage linear vibrating screen is further connected with bagging equipment, and bagging treatment is carried out on the screened impurity materials.
In some embodiments, the mesh number of the first-stage linear vibrating screen is 8 meshes, the screen is detachable, and the screens with different mesh numbers can be adjusted and replaced according to requirements; the design the inside is vibrated to the straight line and is sieved two-layer design, also can set up the multilayer design according to the demand, and the straight line is vibrated and is sieved inside and set up change over switch, according to the material size technical requirement of handling, selects to sieve upper strata or lower floor's material. Compared with the traditional rocker arm type vibrating screen machine, the linear vibrating screen has the advantages of low noise, low failure rate, high treatment efficiency, high screening precision, low energy consumption, long service life of the screen, good sealing property, less dust scattering and overflow and convenient maintenance.
In some embodiments, the mesh of the secondary linear vibrating screen is 6.35mm, the screen is detachable, and the screen with different meshes can be adjusted and replaced according to requirements;
in some embodiments, the screen mesh number of the secondary linear vibrating screen is 40, the screen mesh is detachable, and the screen mesh with different mesh numbers can be adjusted and replaced according to requirements.
In some embodiments, two discharging screws are arranged at the bottom of the storage bin and used for conveying materials to the outlet of the live bottom storage bin, and a stop valve is arranged at the outlet of the buffer storage bin.
In some embodiments, the tobacco leaf/flake feeder, tobacco rod feeder, tobacco soil/tobacco powder feeder, vibrating screen classifier, primary linear vibrating screen, secondary linear vibrating screen, screw conveyor i, buffer storage bin, weighing bagging packer, threshing machine, belt conveyor, iron remover i, winnowing machine, primary crusher, screw conveyor i, secondary crusher, iron remover ii, secondary screw conveyor, iron remover iii, primary screw conveyor are all connected with an automatic control system. The screen plate is arranged in the secondary crusher and can be flexibly replaced; the motor of the equipment is provided with a frequency converter, so that the speed can be regulated on line; and aiming at different materials, the proper frame type is changed, the rotating speed of the equipment is adjusted, and the material processing requirements are met.
The secondary screw conveyor and the iron remover are universal equipment, and the screw conveyor is of a full-sealing mechanism, so that dust leakage is avoided. The vibration screening machine is a general type configuration, mainly gets rid of rope made of hemp, large granule impurity in the material.
In some embodiments, under the automatic control state, the automatic sequential starting, stopping and locking of the process equipment can be realized; the control system is connected with the field frequency converter and the dust removal system through the industrial Ethernet to realize the transmission of equipment and control information, the frequency converter is connected with the dust removal fan, and the control system controls the rotating speed of the fan through the frequency converter. The distributed control system is connected with an upper computer through an industrial Ethernet, the upper computer comprises a dust removal system human-computer control interface, a control program adopts a modular design, the control program is set into three states of automatic, manual and locking, and an operator selects different control states to realize the control of dust removal system equipment. The dust removal system equipment and the raw material pretreatment workshop are mutually independent and isolated.
In some embodiments, 1 feeder is taken as a starting direction, 20 cache bins are taken as an end direction, the equipment start-up sequence is that the equipment is started up from the end to the starting sequence, and if the end equipment is not started up, the starting equipment cannot be started up; if the equipment at the starting end is not stopped, the equipment at the tail end cannot be stopped; so as to ensure the orderly operation of the equipment and the dust removal effect.
In some embodiments, the three pieces of process equipment are identical in control principle, and are convenient to install, operate and maintain.
In some embodiments, the papermaking process reconstituted tobacco raw material pretreatment system is further provided with a dust removal system.
The invention has the beneficial effects that:
(1) by adopting the raw material treatment process, the large sheet rate and the breakage rate of the tobacco leaf raw materials are obviously reduced, the waste is reduced, and the yield of the tobacco leaf raw materials is improved by more than 5 percent.
(2) The crushing quality of the tobacco rod is improved, and the yield of the tobacco rod is improved by more than 10%.
(3) The dust content in the raw material screening process is low, the operation environment is good, and the whole line dust removal effect is good.
(4) The whole line process equipment has reasonable design, small occupied area and concise layout; the control is accurate, the energy consumption is low, the performance of the equipment can be fully exerted, and the material treatment effect and the equipment operation efficiency are improved.
(5) The screen used by the invention can be flexibly replaced, and screens with different screen hole sizes can be selected according to the requirements of customers, so that the principle personalized requirement treatment is realized.
(6) The application has the advantages of simple structure, simplicity in operation and strong practicability.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate embodiments of the application and, together with the description, serve to explain the application and are not intended to limit the application.
FIG. 1 is a flow chart of a reconstituted tobacco raw material pretreatment process.
FIG. 2 is a schematic diagram of an automatic control system;
FIG. 3 is a schematic view of a dust extraction system;
FIG. 4 is a schematic structural diagram of a linear vibrating screen, wherein, A is a side view of the linear vibrating screen, B is a first layer in a top view of the linear vibrating screen, and C is a second layer in the top view of the linear vibrating screen;
wherein, 1, a feeder, 2, a threshing machine, 3, a belt conveyor, 4, an iron remover, 5, a winnowing machine, 6, a storage feeder, 7, a first-level crusher, 8, a conveying screw, 9, a second-level crusher, 10, an iron remover, 11, a first-level conveying screw, 12, a second-level conveying screw, 13, an iron remover, 14, a vibration screening machine, 15, a first-level linear screen, 16, a second-level linear screen 1, 17, a second-level linear screen 2, 18, a screw conveyor, 19, a screw conveyor, 20, a buffer storage bin, 21, a weighing and packing machine, 22, a bagging, 23, a bagging, 24, a bagging, 25, a bagging, 26, an automatic control system, 27, a dedusting system, 28, a tobacco leaf/tobacco flake processing technology, 29, a tobacco rod processing technology, 30, a tobacco soil/tobacco powder processing technology, 31, and a weighing and packing technology;
62 motor, 63 screen cloth, 64 pneumatic change-over switch A, 65 impurity material export A, 66 pneumatic change-over switch B, 67 impurity material export B, 68 material import, 69 available material export A, 70 available material export B, 71 sieve support that shakes.
Detailed Description
It should be noted that the following detailed description is exemplary and is intended to provide further explanation of the disclosure. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments according to the present application. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof, unless the context clearly indicates otherwise.
As introduced in the background art, the method aims at the problems of unsorted treatment of tobacco leaf raw materials, equipment blockage, high failure rate, low operation efficiency, low raw material yield and serious dust. Therefore, the invention provides a pretreatment process method of paper-making reconstituted tobacco raw materials, which adopts a three-head one-tail treatment process, and comprises three feeding treatment process sources and one weighing and packaging process tail; the three feeding treatment processes specifically comprise a 28 tobacco leaf/tobacco flake treatment process, a 29 tobacco rod treatment process and a 30 tobacco soil/tobacco powder treatment process; the 28 tobacco leaf/tobacco flake processing technology comprises a feeding machine 1, a threshing machine 2, a belt conveyor 3, an iron remover 4, a winnowing machine 5, a vibrating screening machine 14, a primary linear vibrating screen 15, a secondary linear vibrating screen 16, a spiral conveyor 1 and a spiral conveyor 18; the 29 cigarette rod processing technology consists of a 6 feeding machine, a 7 first-stage crusher, an 8 spiral conveyer, a 9 second-stage crusher, a 10 iron remover, a 12 second-stage spiral conveyer, a 13 iron remover, a 14 vibration screening machine, a 15 first-stage linear vibrating screen, a 17 second-stage linear vibrating screen 2 and a 19 spiral conveyer; the 30-grade tobacco soil/tobacco powder treatment process consists of a first-grade screw conveyor 11, a second-grade screw conveyor 12, an iron remover 13, a vibrating screening machine 14, a first-grade linear vibrating screen 15, a second-grade linear vibrating screen 17 and screw conveyors 19; the 31 weighing and packaging process consists of a 20 buffer storage bin and a 21 weighing and packaging machine; the pretreatment process method also comprises a 26 automatic control system and a 27 dust removal system, wherein the 26 automatic control system controls the automatic starting and stopping of 28 tobacco leaf/tobacco flake process equipment, 29 tobacco rod processing process equipment, 30 tobacco soil/tobacco powder processing process equipment production lines, 31 weighing and packaging process equipment and 27 dust removal system equipment; the 27 dust removal system realizes environmental dust removal of raw material pretreatment process equipment points.
The specific scheme is as follows:
a paper-making method reconstituted tobacco raw material pretreatment process method adopts a three-head one-tail treatment process, and the method comprises three feeding treatment process sources and one weighing and packaging process tail; the three feeding treatment processes are a tobacco leaf/tobacco flake treatment process, a tobacco rod treatment process and a tobacco soil/tobacco powder treatment process;
the tobacco leaf/tobacco flake processing technology comprises a feeding machine, a threshing machine, a belt conveyor, an iron remover, a winnowing machine, a vibration screening machine, a linear vibration screen and a spiral conveyor; the tobacco rod processing technology consists of a feeding machine, a primary crusher, a screw conveyor, a secondary crusher, an iron remover, a vibration screening machine, a linear vibration screen and a screw conveyor; the tobacco soil/tobacco powder treatment process consists of a primary screw conveyor, a secondary screw conveyor, an iron remover, a vibration screening machine, a linear screen and a screw conveyor; the weighing and packaging process consists of a cache bin and a weighing and packaging machine; the pretreatment process method also comprises an automatic control system and a dust removal system, wherein the automatic control system controls the automatic starting and stopping of tobacco stem treatment process equipment, tobacco leaf/tobacco flake process equipment, tobacco rod treatment process equipment, tobacco soil/tobacco powder treatment process equipment, weighing and packaging process equipment and dust removal system equipment; the dust removal system realizes environmental dust removal of raw material pretreatment process equipment.
The automatic control adopts a PLC distributed control system, the control system is connected with a field control station, a frequency converter and a dust removal system through an industrial Ethernet to realize the transmission of equipment and control information, the field control station and the frequency converter are connected with field equipment, the control system controls the starting and stopping state of the equipment through the field control station, and the control system controls the rotating speed of a motor of the equipment through the frequency converter. The distributed control system is connected with an upper computer through an industrial Ethernet, the upper computer comprises a tobacco flake/tobacco leaf man-machine control interface, a tobacco rod line man-machine control interface and a tobacco soil/tobacco powder line man-machine control interface, the control program adopts a modular design, the control program is set to be in three states of automatic, manual and locking, and an operator selects different man-machine interfaces and control states to realize the control of corresponding material processing equipment.
Wherein, the connection relationship of the tobacco leaf/tobacco flake processing process equipment is as follows: the outlet of the feeding machine is communicated with the inlet of the threshing machine, and the outlet of the threshing machine is communicated with the inlet of the belt conveyor; an iron remover is arranged above the belt conveyor, and an outlet of the belt conveyor is communicated with an inlet of the winnowing machine; the outlet of the winnowing machine is communicated with the inlet of the vibrating screening machine; the outlet of the vibrating screen classifier is communicated with the inlet of the first-stage linear vibrating screen; the first-stage linear vibrating screen is a public device and is provided with two outlets, namely a tobacco powder outlet and a tobacco leaf outlet, the tobacco leaf outlet is communicated with an inlet of the second-stage linear screen 2, the outlet of the second-stage linear screen 2 is communicated with an inlet of a spiral conveyor, and the outlet of the spiral conveyor is communicated with an inlet of a cache bin; the buffer storage bin is provided with three inlets, the bottom of the buffer storage bin is provided with a discharge screw, and the discharge screw outlet is communicated with the weighing and packaging machine.
The air separator has two exports, and export on equipment upper portion and the export of equipment lower part, the export of equipment upper portion be the export of the available material that obtains after the screening, and the export of lower part is the heavier offal and the impurity of wind escape, and the impurity material is handled through the bagging-off, and the export material of upper portion gets into the further fine-grained processing of second grade breaker.
The working operation mode of the winnowing machine is as follows: the rotating speed of the winnowing machine is flexibly controlled and the air quantity is adjusted by adjusting the parameters of a frequency converter of the winnowing machine, and available lighter tobacco leaf materials and heavier impurity materials such as heavier tobacco stems are screened out by wind power to be separated out for bagging treatment.
The connection relationship of the cigarette rod processing process equipment is as follows: the outlet of the feeding machine is communicated with the inlet of a first-stage crusher, the outlet of the first-stage crusher is communicated with the inlet of a screw conveyer, the outlet of the screw conveyer is communicated with the inlet of a second-stage crusher, the outlet of the second-stage crusher is communicated with the inlet of a second-stage screw conveyer, the outlet of the second-stage screw conveyer is communicated with the inlet of a vibrating screen classifier, an iron remover is installed at the inlet of the vibrating screen classifier, and the outlet of the vibrating screen classifier is communicated with the inlet of a first-stage linear vibrating screen; the first-level linear vibrating screen is a public device and is provided with two outlets, namely a tobacco powder outlet and a tobacco leaf outlet, wherein the tobacco powder outlet is communicated with an inlet of the second-level linear screen 1, the outlet of the second-level linear screen 1 is communicated with an inlet of a spiral conveyer, and the outlet of the spiral conveyer is communicated with an inlet of a cache bin.
The connection relationship of the tobacco soil/tobacco powder treatment process equipment is as follows: the outlet of the primary screw conveyor is communicated with the inlet of the secondary screw conveyor, the outlet of the secondary screw conveyor is communicated with the inlet of a vibrating screen classifier, an iron remover is installed at the inlet of the vibrating screen classifier, and the outlet of the vibrating screen classifier is communicated with the inlet of a primary linear vibrating screen; the first-level linear vibrating screen is a public device and is provided with two outlets, namely a tobacco powder outlet and a tobacco leaf outlet, wherein the tobacco powder is communicated with an inlet of the second-level linear screen 1, the outlet of the second-level linear screen 1 is communicated with an inlet of a spiral conveyer, and the outlet of the spiral conveyer is communicated with an inlet of a cache bin.
Preferably, the first-stage linear vibrating screen is provided with an inlet, two material outlets and a waste outlet, the screen of the first-stage linear vibrating screen is movably mounted and convenient to replace, the screen mesh number is 8, the two outlets of the first-stage linear vibrating screen are adjustable, when tobacco/tobacco flake materials are treated, the tobacco leaf outlet is opened, the tobacco powder outlet is closed, upper-layer materials are screened, the materials smaller than 8 meshes are bagged, and the materials larger than 8 meshes enter the second-stage linear vibrating screen 2; when the tobacco soil/tobacco powder and the tobacco rod line are processed, the tobacco powder outlet is opened, the tobacco leaf outlet is closed at the same time, the materials on the lower layer are screened, the small 8-mesh materials enter the secondary linear vibrating screen 1, and the materials larger than 8 meshes are bagged;
preferably, the second-stage linear vibrating screen 1 is provided with an inlet, 1 material outlet and a waste material outlet, the screen of the first-stage linear vibrating screen is movably mounted for convenient replacement, the mesh number of the screen is 40 meshes, the upper-layer materials are screened, the materials larger than 40 meshes enter a screw conveyor, and the materials smaller than 40 meshes are bagged;
preferably, the second-stage linear vibrating screen 2 is provided with an inlet, 1 material outlet and a waste outlet, the screen of the second-stage linear vibrating screen is movably mounted for convenient replacement, the mesh of the screen is used for screening lower-layer materials, the materials smaller than 6.35mm enter a screw conveyor, and the materials larger than 6.35mm are bagged.
The connection relationship of the weighing and packaging process equipment is as follows: the live end bin is provided with two inlets, namely a tobacco powder inlet and a tobacco leaf inlet, and is provided with two outlets, the functions of the two outlets are the same, the outlet of the live end bin is communicated with a packaging bag, and the packaging bag is placed on an electronic scale.
Preferably, there are two ejection of compact spirals at the end of a living feed bin bottom, carry the material to end of a living feed bin export, end valve is installed to end of a living feed bin export, and after wrapping bag material weight was enough, the ejection of compact spiral stopped, and the end valve is closed, stops the ejection of compact. After the packaging bag is replaced, the stop valve is opened, and the discharging screw is opened.
The automatic control system is provided with an engineer station and an operator station, when the system is started to run, the control system is started at the same time, the material type and the process parameters can be set and processed according to production requirements, and the system starts to run after automatic running conditions are met.
The sequence of controlling the tobacco leaf/tobacco flake process equipment is as follows: the feeding machine is taken as the direction of a starting end, the live bottom bin is taken as the direction of a tail end, the equipment is started in sequence from the tail end to the starting end, and if the tail end equipment is not started, the starting end equipment cannot be started; and if the equipment at the starting end is not stopped, the equipment at the tail end cannot be stopped.
Preferably, the tobacco leaf/tobacco flake process equipment controls an automatic starting sequence: the spiral conveyor is started up firstly, and the secondary linear sieve 2, the primary linear vibrating sieve, the vibrating screening machine, the winnowing machine, the belt conveyor, the threshing machine and the feeding machine are started up in sequence; the shutdown sequence is stopped in reverse order.
Preferably, the control of the tobacco soil/tobacco powder processing process equipment and the control of the tobacco rod processing process equipment are the same as the control of the tobacco leaf/tobacco flake process equipment.
And the dust removal system realizes the point-to-point environmental dust removal of the raw material pretreatment process equipment, and is started after the raw material pretreatment process equipment is started.
The pretreatment workshop of this application is in airtight space, and this airtight space links to each other in proper order (can adopt many parallelly connected settings) with whirlwind blanking ware, bag collector, dust exhausting fan through many dust removal pipelines, constitutes dust pelletizing system on the whole to merge into automatic control system, as shown in fig. 3.
The invention also provides a reconstituted tobacco raw material pretreatment process method, which adopts a three-head one-tail treatment process, and comprises three feeding treatment process sources and one weighing and packaging process tail; the three feeding treatment processes are a tobacco leaf/tobacco flake treatment process, a tobacco rod treatment process and a tobacco soil/tobacco powder treatment process; the pretreatment process method also comprises an automatic control system and a dust removal system, wherein the automatic control system controls the automatic starting and stopping of tobacco stem treatment process equipment, tobacco leaf/tobacco flake process equipment, tobacco rod treatment process equipment, tobacco soil/tobacco powder treatment process equipment, weighing and packaging process equipment and dust removal system equipment; the dust removal system realizes environmental dust removal of raw material pretreatment process equipment.
Preferably, the tobacco leaf/tobacco flake processing technology comprises a feeding machine, a threshing machine, a belt conveyor, an iron remover, a winnowing machine, a vibration screening machine, a primary linear vibration screen, a secondary linear vibration screen and a screw conveyor;
preferably, the tobacco rod processing technology consists of a feeding machine, a primary crusher, a screw conveyer, a secondary crusher, an iron remover, a vibration screening machine, a primary linear vibrating screen, a secondary linear vibrating screen and a screw conveyer;
preferably, the tobacco soil/tobacco powder treatment process consists of a primary screw conveyor, a secondary screw conveyor, an iron remover, a vibration screening machine, a primary linear vibration screen, a secondary linear vibration screen and a screw conveyor;
preferably, the weighing and packaging process consists of a buffer storage bin and a weighing and packaging machine.
Preferably, the primary linear vibrating screen is a three-line convergence point and is provided with an inlet, two material outlets and a leftover outlet; two outlets of the primary linear vibrating screen are adjustable, when tobacco/tobacco flake materials are processed, the tobacco leaf outlet is opened, the tobacco powder outlet is closed at the same time, and upper-layer materials are screened; when the tobacco soil/tobacco powder and the tobacco rod line are processed, the tobacco powder outlet is opened, the tobacco leaf outlet is closed at the same time, and the lower layer material is screened.
Preferably, the mesh number of the first-stage linear vibrating screen is 8 meshes, the screen is detachable, and the screen with different mesh numbers can be adjusted and replaced according to requirements.
Preferably, the second grade straight line shakes and sieves screen cloth mesh and be 6.35mm, and the screen cloth is detachable, can adjust the screen cloth of changing different mesh according to the demand.
Preferably, the screen mesh number of the secondary linear vibrating screen is 40 meshes, the screen mesh is detachable, and the screen mesh with different mesh numbers can be adjusted and replaced according to requirements.
Preferably, the bottom of the storage bin is provided with two discharging screws, the materials are conveyed to the outlet of the movable bottom storage bin, and the outlet of the buffer storage bin is provided with a stop valve.
Preferably, the automatic control of tobacco stem processing process equipment, tobacco leaf/tobacco flake processing process equipment, tobacco rod processing process equipment, tobacco soil/tobacco powder processing process equipment, weighing and packaging process equipment and dust removal system equipment can be realized, and the control system has three control states of automatic control, manual control and locking control.
Preferably, under the automatic control state, the automatic sequential starting, stopping and locking of the process equipment can be realized.
Preferably, 1 feeder is taken as a starting direction, 20 cache bins are taken as a tail end direction, the equipment is started in sequence from the tail end to the starting end, and if the tail end equipment is not started, the starting end equipment cannot be started; and if the equipment at the starting end is not stopped, the equipment at the tail end cannot be stopped.
Preferably, the control principle of the three pieces of process equipment is the same.
The present invention is described in further detail below with reference to specific examples, which are intended to be illustrative of the invention and not limiting.
Example 1
The 28 tobacco leaf/tobacco flake treatment process comprises the following steps: feeding tobacco leaves/tobacco flakes through a feeder 1, wherein an outlet of the feeder 1 is communicated with an inlet of a threshing machine 2, threshing the tobacco leaves through the threshing machine 2, and an outlet of the threshing machine 2 is communicated with an inlet of a belt conveyor 3; 4 iron removers are arranged above the belt conveyor 3, and materials are conveyed to the inlet of the winnowing machine 5 through the outlet of the belt conveyor 3; the outlet of the 5 winnowing machine is communicated with the inlet of the 14 vibration screening machine; packing the winnowed leftovers into 22 bags; the outlet of the wind-separated material is communicated with the inlet of a 15-stage linear vibrating screen through a 14-vibration screening machine; the 15 first-stage linear vibrating screen is a public device and is provided with two outlets, namely a tobacco powder outlet and a tobacco leaf outlet, the tobacco leaf outlet is communicated with an inlet of a 17 second-stage linear screen 2, leftovers screened out by the 17 second-stage linear screen are bagged by 25, and the outlet of the 17 second-stage linear screen 2 is communicated with an inlet of a 19 spiral conveyer; the outlet of the screw conveyor 19 is communicated with the inlet of the buffer storage bin 20; available material that sieves out through 17 second grade rectilinear sieve carries to 20 buffer memory feed bins through 19 screw conveyer, 20 buffer memory feed bins have three entries, and the bottom is equipped with ejection of compact spiral, ejection of compact spiral export communicates with each other with 21 baling presses of weighing.
The 15-stage linear vibrating screen is provided with three line collection points, and is provided with an inlet, two material outlets and a leftover outlet; the 15-stage linear vibrating screen is detachable, and can be adjusted and replaced with screens of different meshes according to requirements; the two outlets of the 15-stage linear vibrating screen are adjustable, when tobacco/tobacco flake materials are processed, the tobacco leaf outlet is opened, the tobacco powder outlet is closed at the same time, the upper layer materials are screened, the materials smaller than 8 meshes are bagged by 23, and the materials larger than 8 meshes enter the 17-stage linear vibrating screen 2; when the tobacco soil/tobacco powder and the tobacco rod line are processed, the tobacco powder outlet is opened, the tobacco leaf outlet is closed at the same time, the lower layer material is taken out by the sieve, the small 8-mesh material enters the 16-level two-stage linear vibrating sieve 1, and the material larger than 8 meshes is bagged by 23.
Wherein, available upper material is sieved to the one-level straight line sieve that shakes, and available material export A of 64 pneumatic type change over switch A, 65 impurity material export A, 69 is interlock control, and available material export B of 66 pneumatic type change over switch B, 67 impurity material export B, 70 is interlock control.
The 64 pneumatic type change-over switch A performs actions, the 65 impurity material outlet A is opened, and the 69 available material outlet A is closed; the pneumatic type change-over switch B66 executes actions, the impurity material outlet B is closed 67, and the available material outlet B is opened 70; the material enters a vibrating screen through a 68 material inlet, is screened by a 63 screen, and then is discharged from a 65 impurity material outlet A, and is packaged; the upper material is discharged from a material outlet B70 and enters a 16-stage linear vibrating screen 1.
The start and stop control sequence of the leaf/tobacco flake processing technology is as follows:
the starting sequence is as follows: in an automatic state, a human-computer control interface of the tobacco leaf/tobacco flake processing technology is selected, a starting command is clicked, the dust removal system 27 is automatically started firstly, and the spiral conveyor 18, the secondary linear vibrating screen 16, the primary linear vibrating screen 15, the vibrating screen machine 14, the secondary spiral conveyor 12, the secondary crusher 9, the winnowing machine 5, the belt conveyor 3, the threshing machine 2 and the feeding machine 1 are started sequentially.
And (3) stopping sequence: according to the starting sequence, stopping in a reverse order, wherein the specific stopping sequence is as follows: the method comprises the following steps of stopping a feeding machine 1, and subsequently stopping a threshing machine 2, a belt conveyor 3, a winnowing machine 5, a secondary crusher 9, a secondary screw conveyor 12, a vibrating screening machine 14, a primary linear vibrating screen 15, a secondary linear vibrating screen 16, a screw conveyor 18 and a dust removal system 27 in sequence.
The starting and stopping control sequence of the cigarette rod processing technology is as follows:
in an automatic state, a human-computer control interface of the tobacco rod processing technology is selected, a starting command is clicked, the dust removal system 27 is automatically started firstly, and the spiral conveyor 19, the secondary linear vibrating screen 17, the primary linear vibrating screen 15, the vibrating screen classifier 14, the secondary spiral conveyor 12, the secondary crusher 9, the conveying screw 8, the primary crusher 7 and the feeder 6 are started sequentially.
And (3) stopping sequence: according to the starting sequence, stopping in a reverse order, wherein the specific stopping sequence is as follows: the feeding machine 6 is stopped firstly, and then the primary crusher 7, the conveying screw 8, the secondary crusher 9, the secondary screw conveyor 12, the vibrating screen classifier 14, the primary linear vibrating screen 15, the secondary linear vibrating screen 16, the screw conveyor 18 and the dust removal system 27 are stopped in sequence.
The start and stop control sequence of the tobacco soil/tobacco powder treatment process is as follows:
in an automatic state, a human-machine control interface of the tobacco soil/tobacco powder treatment process is selected, a starting command is clicked, the dust removal system 27 is automatically started firstly, and then the spiral conveyor 19, the secondary linear vibrating screen 17, the primary linear vibrating screen 15, the vibrating screen machine 14, the secondary spiral conveyor 12 and the primary spiral conveyor 11 are automatically started in sequence.
And (3) stopping sequence: according to the starting sequence, stopping in a reverse order, wherein the specific stopping sequence is as follows: the primary screw conveyor 11, the secondary screw conveyor 12, the vibrating screen classifier 14, the primary linear vibrating screen 15, the secondary linear vibrating screen 17, the screw conveyor 19 and the dust removing system 27 are sequentially stopped.
By adopting the raw material treatment process system, the tobacco yield can reach more than 95 percent, and the tobacco rod yield can reach more than 40 percent.
Example 2
The 29 cigarette rod treatment process comprises the following steps: feeding the tobacco rod by a 6-feeder in the tobacco rod processing technology, wherein an outlet of the 6-feeder is communicated with an inlet of a 7-stage crusher, an outlet of the 7-stage crusher is communicated with an inlet of an 8-stage screw conveyor, and an outlet of the 8-stage screw conveyor is communicated with an inlet of a 9-stage crusher; after being crushed by a primary crusher 7, the tobacco rod material is conveyed to a secondary crusher 9 by a screw conveyer 8 to be crushed; the outlet of the 9-stage secondary crusher is communicated with the inlet of a 12-stage screw conveyor, the outlet of the 12-stage screw conveyor is communicated with the inlet of a 14-stage vibrating screen machine, an iron remover is arranged at the inlet of the 14-stage vibrating screen machine, and the outlet of the 14-stage vibrating screen machine is communicated with the inlet of a 15-stage linear vibrating screen; conveying the crushed materials to 15 first-stage linear vibrating screen screening treatment by a 12 second-stage screw conveyor and a 14 vibrating screen grader in sequence; the 15 first-stage linear vibrating screen is a three-line convergence point and is provided with two outlets, namely a tobacco powder outlet and a tobacco leaf outlet, wherein the tobacco powder outlet is communicated with an inlet of a 16 second-stage linear screen 1, the outlet of the 16 second-stage linear screen 1 is communicated with an inlet of an 18 spiral conveyor, and the outlet of the 18 spiral conveyor is communicated with an inlet of a 20 cache bin; after the tobacco powder is screened by the 15-grade linear vibrating screen, the materials larger than 8 meshes are bagged by the 23-grade linear vibrating screen, and the small 8-mesh materials enter the 16-grade linear vibrating screen 1; the mesh number of the 16-stage linear vibrating screen 1 is 40 meshes; after the materials are screened by a 16-level two-stage linear vibrating screen 1, the materials larger than 40 meshes are conveyed to a 20-mesh buffer storage bin by an 18-mesh spiral conveyor; the materials with the grain size smaller than 40 meshes are bagged by 24.
Wherein, available lower material is sieved to the one-level straight line sieve that shakes, and 64 pneumatic type change over switch A, 65 available material export A, 69 available material export A are chain control, and 66 pneumatic type change over switch B, 67 available material export B, 70 available material export B are chain control.
The 64 pneumatic type change-over switch A performs actions, the 65 impurity material outlet A is closed, and the 69 available material outlet A is opened; a 66 pneumatic type change-over switch B executes action, 67 an impurity material outlet B is opened, and 70 an available material outlet B is closed; the material enters a vibrating screen through a 68 material inlet, is screened by a 63 screen, and then is discharged from a 69 available material outlet A and enters a 17 second-stage linear vibrating screen 2; the upper material is discharged through a 67 impurity material outlet B and is packaged.
Example 3
The 30-tobacco soil/tobacco powder treatment process comprises the following steps: feeding tobacco soil/tobacco powder by a first-level screw conveyor 11, wherein an outlet of the first-level screw conveyor 11 is communicated with an inlet of a second-level screw conveyor 12, an outlet of the second-level screw conveyor 12 is communicated with an inlet of a vibrating screen machine 14, an iron remover is arranged at the inlet of the vibrating screen machine 14, and an outlet of the vibrating screen machine 14 is communicated with an inlet of a linear vibrating screen machine 15; conveying the crushed materials to 15 first-stage linear vibrating screen screening treatment by a 12 second-stage screw conveyor and a 14 vibrating screen grader in sequence; the 15 first-stage linear vibrating screen is a three-line gathering point and is provided with two outlets, namely a tobacco powder outlet and a tobacco leaf outlet, wherein the tobacco powder outlet is communicated with the inlet of the 16 second-stage linear vibrating screen 1, the outlet of the 16 second-stage linear vibrating screen 1 is communicated with the inlet of the 18 spiral conveyer, and the outlet of the 18 spiral conveyer is communicated with the inlet of the 20 cache bin.
The 16 second-stage linear vibrating screen 1 is provided with an inlet, 1 material outlet and a waste material outlet, the 16 second-stage linear vibrating screen 1 is movably mounted with a screen mesh of 40 meshes, the screen mesh is convenient to replace, the upper-layer materials are screened, the materials larger than 40 meshes enter an 18-screw conveyor, and the materials smaller than 40 meshes are bagged by 24;
17 second grade straight line shakes and sieves 2, has an import, 1 material export, a waste outlet altogether, 17 second grade straight line shakes and sieves the movable installation of screen cloth for convenient change, and the screen cloth mesh is 6.35mm, sieves and gets lower floor's material, is less than 6.35mm material and gets into 19 screw conveyer, is greater than 6.35 material and handles through 25 bagging-offs.
Example 4
The 31 weighing and packaging process equipment comprises the following steps: the 20 buffer storage bins are provided with two inlets, namely a tobacco powder inlet and a tobacco leaf inlet, the 20 movable-bottom bins are provided with two outlets, the functions of the two outlets are the same, and the outlets of the 20 movable-bottom bins are communicated with the 21 weighing bagging and packaging machine.
There are two ejection of compact spirals 21 buffer memory feed bin bottom, carry the material to the export of false bottom feed bin, 21 buffer memory feed bin export installation stop valve, wrapping bag material weight is enough after, ejection of compact spiral stops, and the stop valve is closed, stops the ejection of compact. After the packaging bag is replaced, the stop valve is opened, and the discharging screw is opened.
The 26 automatic control system is configured with an engineer station and an operator station, when the system is started to operate, the control system is started simultaneously, the material type and the process parameters can be set and processed according to the production requirement, and after the system has the automatic operation condition, the system starts to operate.
The sequence of controlling the tobacco leaf/tobacco flake process equipment is as follows: taking the feeder 1 as the direction of a starting end, taking the cache bin 20 as the direction of a tail end, and sequentially starting the equipment from the tail end to the starting end, wherein if the tail end equipment is not started, the starting end equipment cannot be started; and if the equipment at the starting end is not stopped, the equipment at the tail end cannot be stopped.
29 automatic starting sequence controlled by tobacco leaf/tobacco flake process equipment: starting a screw conveyor 18, sequentially starting a secondary 16 linear sieve 2, a primary 15 linear vibrating sieve, a vibrating sieving machine 14, a winnowing machine 5, a belt conveyor 3, a threshing machine 2 and a feeding machine 1; the shutdown sequence is stopped in reverse order.
28 tobacco soil/tobacco powder processing process equipment control, 29 tobacco rod processing process equipment control and 30 tobacco leaf/tobacco flake process equipment control principles are the same.
And the dust removal system 27 realizes the point-to-point environmental dust removal of the raw material pretreatment process equipment, and after the raw material pretreatment process equipment is started, the dust removal system is started.
Comparative example 1
The difference from example 1 is that: by adopting a production line for processing 5 raw materials, the yield of the tobacco leaves is 90 percent, and the yield of the tobacco soil rods is 40 percent.
It should be noted that the above-mentioned embodiments are only preferred embodiments of the present invention, and the present invention is not limited thereto, and although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that modifications and equivalents can be made in the technical solutions described in the foregoing embodiments, or equivalents thereof. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention. Although the embodiments of the present invention have been described with reference to the accompanying drawings, it is not intended to limit the scope of the present invention, and it should be understood by those skilled in the art that various modifications and variations can be made without inventive efforts by those skilled in the art based on the technical solution of the present invention.

Claims (10)

1. The paper-making process reconstituted tobacco raw material pretreatment system is characterized by comprising the following steps: the tobacco leaf/tobacco flake feeding machine, the tobacco rod feeding machine, the tobacco soil/tobacco powder feeding machine, the vibration screening machine, the first-level linear vibration screen, the second-level linear vibration screen, the screw conveyor I, the cache bin and the weighing bagging and packaging machine; the vibration screening machine, the first-stage linear vibration screen, the second-stage linear vibration screen, the screw conveyor I, the buffer storage bin and the weighing bagging and packaging machine are sequentially connected; the tobacco leaf/tobacco flake feeding machine is sequentially connected with the threshing machine, the belt conveyor, the iron remover I, the winnowing machine and the vibration screening machine; the tobacco rod feeding machine is sequentially connected with a primary crusher, a screw conveyor I, a secondary crusher, an iron remover II, a secondary screw conveyor, an iron remover III and the vibration screening machine; the tobacco soil/tobacco powder feeding machine is sequentially connected with the primary screw conveyor and the secondary screw conveyor.
2. The papermaking-process reconstituted tobacco raw material pretreatment system according to claim 1, wherein the two groups of the secondary linear vibrating screens and the screw conveyor I are arranged in parallel.
3. The system for pretreating papermaking reconstituted tobacco raw materials according to claim 1, wherein the air separator is further connected with bagging equipment.
4. The system for pretreating paper-making reconstituted tobacco raw materials according to claim 1, wherein the primary linear vibrating screen is further connected with bagging equipment.
5. The system for pretreating paper-making reconstituted tobacco raw materials according to claim 1, wherein the secondary linear vibrating screen is further connected with bagging equipment.
6. The system for pretreating raw materials of paper-making reconstituted tobacco according to claim 1, wherein the tobacco/tobacco flake feeding machine, the tobacco rod feeding machine, the tobacco soil/tobacco powder feeding machine, the vibration screening machine, the primary linear vibration sieve, the secondary linear vibration sieve, the screw conveyor I, the buffer storage bin, the weighing bagging and packaging machine, the threshing machine, the belt conveyor, the iron remover I, the winnowing machine, the primary crushing machine, the screw conveyor I, the secondary crushing machine, the iron remover II, the secondary screw conveyor, the iron remover III and the primary screw conveyor are all connected with an automatic control system.
7. The system for pretreating paper-making reconstituted tobacco raw materials according to claim 6, wherein the automatic control system can realize automatic control of tobacco stem processing process equipment, tobacco leaf/tobacco flake process equipment, tobacco rod processing process equipment, tobacco soil/tobacco powder processing process equipment, weighing and packaging process equipment and dust removal system equipment, and the control system has three control states of automatic control, manual control and locking;
preferably, under the automatic control state, the automatic sequential starting, stopping and locking of the process equipment can be realized;
preferably, 1 feeder is taken as a starting direction, 20 cache bins are taken as a tail end direction, the equipment is started in sequence from the tail end to the starting end, and if the tail end equipment is not started, the starting end equipment cannot be started; if the equipment at the starting end is not stopped, the equipment at the tail end cannot be stopped;
preferably, the control principle of the three pieces of process equipment is the same.
8. The system for pretreating paper-making reconstituted tobacco raw materials according to claim 1, wherein a dust removal system is further arranged in the system for pretreating paper-making reconstituted tobacco raw materials.
9. The system for pretreating paper-making reconstituted tobacco raw materials according to claim 1, wherein the mesh number of the primary linear vibrating screen is 8 meshes, the screen is detachable, and screens with different mesh numbers can be adjusted and replaced according to requirements;
or the meshes of the secondary linear vibrating screen are 6.35mm, the screen is detachable, and the screens with different meshes can be adjusted and replaced according to requirements;
or the screen mesh number of the secondary linear vibrating screen is 40 meshes, the screen mesh is detachable, and the screen mesh with different mesh numbers can be adjusted and replaced according to requirements.
10. The system for pretreating paper-making reconstituted tobacco raw materials according to claim 1, wherein two discharge screws are arranged at the bottom of the bin and used for conveying materials to an outlet of the bin with a movable bottom, and a stop valve is arranged at an outlet of the buffer bin.
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