Re-dried broken tobacco flake screening device adopting orthogonal cosine wave conveying

Abstract

The utility model discloses a redrying broken tobacco flake screening device adopting orthogonal and cosine wave conveying. The screening device comprises a conveyor (3), a vibrating screen (4), a broken material output device (5), a tobacco flake output device (6) and a conveying plate (7). Materials are input to the conveying screening plate to complete screening of loose broken tobacco flakes; a surface transmission surface of the conveying and screening plate (1) is a wave-shaped surface, the wave-shaped surface is a spatial curved surface formed by orthogonality of a curved surface formed by moving along a first track and a curved surface formed by moving along a second track, and the conveying and screening plate is used for loose conveying and uniform distribution of tobacco materials; screening holes are formed in the wave trough lines and used for cosine curve screening of redried broken tobacco flakes or broken tobacco in tobacco shreds and stem sliver separation in the tobacco shreds, the material loosening effect and screening efficiency are high, and the probability of breakage is low.

Description

Technical Field

[0001] The utility model belongs to the field of tobacco, relates to cigarette production technology, and particularly relates to a re-dried tobacco chip screening device for orthogonal cosine wave conveying, which is applied to on-line tobacco chip screening on a re-drying production line and "sesame chip" screening and "stem stick" separation on a cigarette making production line. Background Art

[0002] On a threshing and redrying production line, it is an important process to screen out fragments (3mm - 6mm square), fine powder (<3mm square) and dust (<0.8mm) from the tobacco sheet material on-line. Since the proportion of large and medium-sized tobacco sheets in the tobacco sheet is high (more than 12.5mm square), at least seventy or eighty percent or more (varying with different leaf types and positions), while the content of fragments and fine powder is low, generally less than 2%. The fragments and fine powder are either clamped and wrapped, or adsorbed, or mixed in the large and medium-sized tobacco sheets, and compared with the medium and large-sized tobacco sheets, they are lighter in weight. Therefore, according to these physical characteristics, it is difficult to screen through and completely screen out by existing technologies such as linear flat vibrating screens, and the screening line is also made longer; for a further solution to screen through and completely screen out, the tobacco sheets may be sent into the cigarette making workshop and screened again before the cigarette making process, such as using the "nostril screening" technology, etc. However, the "nostril screen" has low screening efficiency, is sticky to tobacco oil, and has a high manufacturing cost. More importantly, it causes high breakage. In short, in the prior art, it is difficult to screen through and completely screen out the fragments in the re-dried tobacco leaves, and the technical difficulty is high or the work efficiency is low.

[0003] In the cigarette making process, the same problem is also faced. In the cigarette making process, it is also necessary to screen the tobacco shreds smaller than 5mm square on the tobacco shred line, or called "sesame chip screening". The existing linear flat vibrating screen technology is also difficult to screen through and completely screen out for the same reason. When the "nostril screen" is used for screening tobacco shreds, the above problems of low screening efficiency, sticky to tobacco oil, high manufacturing cost and high breakage also exist, and it is easy to block the holes for tobacco shreds. At the same time, tobacco shred screening also has to face the key common technical problems in the tobacco field, that is, "stem stick separation" in tobacco shreds.

[0004] Therefore, it is desired to solve the problem of the accumulation of re-dried tobacco leaves in the vibrating screen, complete their loose conveying and on-line screening of tobacco chips, improve the screening through and complete screening effect, and on-line screen "sesame chips" in the cigarette making process, and at the same time complete some "stem stick separation" in tobacco shreds.

[0005] In order to solve the above problems, the present utility model is proposed. Content of the Utility Model

[0006] Based on the above screening series of problems, the utility model first thought of designing the screening surface, applying the typical cosine basis function "orthogonal method" in engineering mathematics, that is, the cosine basis function in the orthogonal system. The key technical theory is that the cosine wave trough lines of the conveying and screening plates are all designed in the same horizontal plane. If the wave trough lines of the conveying and screening plates can be designed in three-dimensional space and the "orthogonal method" is also used for design, so that the "amplitude" can be superimposed, obviously, the mathematical models and the physical performance of the vibrating screen of the two will have significant differences, and the effect of loosening the material will be better. Therefore, the best technology can be selected according to the specific material characteristics. For example, for hundreds of key processes of tobacco material conveying and screening in the cigarette industry, such as fluidity, loose distribution, breakage and screening efficiency, different requirements can be designed.

[0007] According to the physical characteristics of the simple harmonic vibration of the vibrating screen, if the cosine curve wave trough lines of the screening plate are designed in three-dimensional space, it will provide better conveying and loosening effects and screening efficiency. Especially for the threshing and redrying cut tobacco production line, since the cut tobacco is stacked thickly in the vibrating screen and agglomerated into blocks, high-efficiency loose conveying of the cut tobacco in the vibrating screen can be realized, that is, cosine wave conveying. Or during the screening process, the sieve plate can make the large cut tobacco "float" along the wave crest for conveying, and the broken tobacco is conveyed and screened in the wave trough, then the performance and efficiency of the production line can be improved, and the production line can be made shorter. Or when screening the broken tobacco or "sesame flakes" in the cut tobacco production line process, if screening holes are designed on the cosine curve of the wave trough, because the "stem sticks" in the vibrating screen have greater hardness, puncture resistance, weight and momentum than cut tobacco, the screening holes designed on this curve will probably capture the "stem sticks" to complete their separation, that is, "stem stick separation". Or it can be considered that the "stem sticks" that cannot be captured by the screening holes designed on this curve according to technical requirements may be regarded as cut tobacco stems, which have no influence on cigarettes.

[0008] To sum up, in order to solve the problem of the accumulation of re-dried cut tobacco in the vibrating screen, complete its loose conveying and online screening of broken cut tobacco flakes, and improve its screening-through and screening-out effects, it is very valuable to study the orthogonal cosine wave conveying, and it has broad application prospects in the online screening of "sesame flakes" in the cut tobacco process and at the same time completing certain "stem stick separation" in cut tobacco.

[0009] The utility model is specifically realized through the following technical solutions:

[0010] To solve at least one aspect of the above problems, the utility model provides a screening device for re-dried broken tobacco flakes with orthogonal cosine wave conveying, which includes a feeder 3, a vibrating screen 4, a broken material output device 5, a cut tobacco output device 6, and a conveying plate 7;

[0011] The vibrating screen 4 includes a conveying and screening plate 1, and the conveying and screening plate 1 is provided with screening holes 2;

[0012] The conveying and screening plate 1 is in material communication with the tobacco sheet output device 6 through the conveying plate 7, and below the vibrating screen 4 is the crushed material output device 5;

[0013] The surface transmission surface of the conveying and screening plate 1 is set as a corrugated surface, and the corrugated surface is a space surface formed by the orthogonality of the surface formed by moving along the first trajectory and the surface formed by moving along the second trajectory. The first trajectory is a cosine curve in the first vertical plane, and the tangents at the wave crest and wave trough of the first trajectory are parallel to the width direction of the screening plate. The second trajectory is a cosine curve in the second vertical plane, and the tangents at the wave crest and wave trough of the second trajectory are parallel to the length direction of the screening plate. The first vertical plane and the second vertical plane are perpendicular and orthogonal to each other;

[0014] The length direction of the conveying and screening plate 1 is the conveying direction of the tobacco sheet material.

[0015] Preferably, when the conveying and screening plate 1 is pressed from "thin parts", the thickness of the thin parts is 2 - 4 mm;

[0016] Preferably, in the space coordinate system constructed by the first vertical plane and the second vertical plane, the equation of the first trajectory is y = acos(ω1x), the wavelength is λ1, the equation of the second trajectory is y = bcos(ω2z), the wavelength is λ2, and preferably a = 1, b = 1, ω1 = 1, ω2 < 1.

[0017] That is, in the three-dimensional coordinate system, the corrugated surface formed by the y = acos(ω1x) curve extending in the z-axis direction according to the law of the y = bcos(ω2z) curve is the transmission surface. Given a y value, there are corresponding x and z coordinate values:

[0018]

[0019] Here, k1 and k2 are integers.

[0020] Preferably, the screening holes 2 are manufactured on the wave trough line, and the cosine basis function of this wave trough line is: y = bcos(ω2z), x = nπ, n is a positive integer representing the wave trough line number, and the processing direction of the screening holes 2 is perpendicular to the xoz plane (the plane of the conveying and screening plate 1).

[0021] Preferably, for the requirements of the re-drying process, when screening the broken tobacco in the tobacco sheet, select the value of the diameter d of the screening holes 2 on the conveying and screening plate 1 to be 6 mm. The screening holes 2 are manufactured on the wave trough line for the cosine curve screening of the re-dried broken tobacco sheets;

[0022] The processing direction of the screening holes 2 is perpendicular to the plane of the conveying and screening plate 1.

[0023] Preferably, for the requirements of the cigarette making process, when screening "sesame flakes" broken tobacco in the cut tobacco and separating the stem pieces in the cut tobacco, select the value of the diameter d of the screening holes 2 on the conveying and screening plate 1 to be 5 mm. The screening holes 2 are manufactured on the wave trough line in the plane perpendicular to the xoz plane. The screening holes 2 are manufactured on the wave trough line for the cosine curve screening of broken tobacco in the cut tobacco and the separation of stem pieces in the cut tobacco. The screening plate 2 is connected to the cigarette making line;

[0024] The processing direction of the screening holes 2 is perpendicular to the plane of the conveying and screening plate 1.

[0025] Preferably, the design of the length L and width B of the conveying and screening plate 1 is rounded according to the golden ratio of 0.618.

[0026] The application of the re-dried broken tobacco flake screening device with orthogonal cosine wave conveying of the present invention is used for separating tobacco flakes in the re-dried broken tobacco flakes in the re-drying process or for separating stem pieces in the cut tobacco in the cigarette making process.

[0027] Preferably, the application of the re-dried broken tobacco flake screening device with orthogonal cosine wave conveying includes the following steps: The re-dried broken tobacco flakes or cut tobacco are input as materials into the conveying and screening plate 1 in the vibrating screen 4 by the feeder 3 to complete their loose distribution, and the broken tobacco is screened by the screening holes 2. The broken tobacco is output by the broken material output device 5, and the tobacco flakes or stem pieces are output by the conveying plate 7 through the tobacco flake output device 6.

[0028] Compared with the prior art, the present invention has the following beneficial effects:

[0029] 1. In the threshing and redrying production line, since tobacco flakes of various specifications often accumulate or are clamped and wrapped with each other, when using the current linear vibrating trough flat conveying plate to complete its loose conveying online, the effect is poor. The conveying and screening plate without processing screening holes in the present invention can effectively solve this problem. The reason is that the transmission surface on the surface of the conveying and screening plate is a cosine wave surface in both the length direction and the width direction. The wave peaks and wave troughs have the best mechanical characteristics for the materials, quickly loosening and evenly distributing the materials. Further, screening holes are manufactured on the wave trough line for the cosine curve screening of re-dried broken tobacco flakes or broken tobacco in the cut tobacco and the separation of stem pieces in the cut tobacco. The present invention has a high loose effect and screening efficiency for the materials, and low breakage.

[0030] 2. When screening and classifying the broken tobacco flakes of the re-dried cut tobacco, as long as the size of the cut tobacco is larger than the square of the wavelength λ1, theoretically, the large cut tobacco flakes will be conveyed in a floating manner along the wave peaks or wave surfaces, enabling the small-sized tobacco flakes to be screened in the wave troughs. And the screening holes are manufactured on the curve of the wave trough with a cosine curve. The movement of the materials along the cosine curve is a typical curve screening. Therefore, the screening efficiency and the performance of the production line are improved, and the production line can be made shorter.

[0031] 3. When this technical solution is applied to the cigarette making process, since the screening of "sesame flakes" in cut tobacco is the most important process in cigarette making, and currently it is generally completed by a linear plane vibrating screen. Obviously, as long as the diameter of the screening holes on the conveying and screening plate is customized to the value of d = 5mm required by the process and connected to the cigarette production line, the screening of "sesame flakes" can also be completed efficiently.

[0032] "Stem separation" is a key common problem in the tobacco field. Since cut tobacco and stem chips have different physical characteristics, such as hardness, puncture resistance, weight, and momentum or impulse in the vibrating screen. In this technical solution, the screening holes are made on the wave troughs, and the wave trough line is a cosine curve. Small-sized materials will move within the wave troughs. Therefore, the screening holes will probably capture the "stem chips" to complete their separation, that is, to achieve "stem separation". A further embodiment is: on a section of the wave trough cosine curve with a wavelength λ2 of 62.832mm, there are 5 screening holes with a diameter of ￠5mm. The "stem chips" that move within the wave troughs and meet the separation requirements of this screening hole size will probably be separated. Since the surface of the conveying and screening plate in this technical solution is a spatial curved surface, specifically an orthogonal cosine wave curved surface, the breakage rate of the materials is the lowest, much lower than that of a plane vibrating screen, etc.

[0033] 4. Since screening technology is important and crucial in the tobacco processing industry, the key orthogonal cosine wave curved surface and wave trough line screening method in this technical solution have a promoting significance for the development of cigarette making equipment technology in the tobacco industry. Similarly, in other fields such as food, medicine, and mining, this technical solution also has promotional value and obvious economic and social benefits. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] In order to better understand the above and other purposes, features, advantages, and functions of the present invention, the embodiments shown in the drawings can be referred to. The same reference numerals in the drawings refer to the same components. Those skilled in the art should understand that the drawings are intended to schematically illustrate the preferred embodiments of the present invention and have no restrictive effect on the scope of the present invention. The components in the drawings are not drawn to scale.

[0035] In the drawings:

[0036] Figure 1 is a schematic structural diagram of the re-dried cut tobacco flake screening device with orthogonal cosine wave conveying and stem separation in cut tobacco of the present invention;

[0037] Figure 2 is a schematic diagram of the conveying and screening plate for loose conveying and uniform distribution of tobacco materials such as tobacco flakes and cut tobacco in the embodiment of the present invention;

[0038] Figure 3 is a schematic diagram of the thin part with a thickness of 2mm of the conveying and screening plate in the embodiment of the present invention;

[0039] Figure 4 It is a design schematic diagram of the conveying and screening plate in the embodiment of the present utility model;

[0040] Figure 5 It is a design schematic diagram of the size of the conveying and screening plate, the position of the wave trough line and the screening holes in the embodiment of the present utility model;

[0041] Names of the reference numerals in the description of the drawings: conveying and screening plate 1, screening holes 2, feeder 3, vibrating screen 4, broken material outputter 5, tobacco sheet outputter 6, conveying plate 7. Detailed implementation manners

[0042] The following further elaborates in detail on the above and other technical features and advantages of the present utility model with reference to the drawings. In the description of the present utility model, it should be understood that the terms "first" and "second" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include at least one of such features. In the description of the present utility model, "a plurality of" means at least two, unless otherwise specifically defined.

[0043] In the present utility model, unless otherwise clearly defined and limited, the terms "installation", "connection", "connection", "fixation" and other terms should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or integrated; it may be directly connected, or indirectly connected through an intermediate medium, and may be the internal communication of two components or the interaction relationship between two components, unless otherwise clearly limited. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0044] In the present utility model, unless otherwise clearly defined and limited, the first feature being "on" or "under" the second feature may be that the first and second features are in direct contact, or the first and second features are indirectly in contact through an intermediate medium. Moreover, the first feature being "above", "over" and "on" the second feature may be that the first feature is directly above or obliquely above the second feature, or merely indicates that the first feature has a higher horizontal height than the second feature. The first feature being "under", "below" and "beneath" the second feature may be that the first feature is directly below or obliquely below the second feature, or merely indicates that the first feature has a lower horizontal height than the second feature.

[0045] To solve at least one aspect of the above problems, the present utility model provides a re-dried broken tobacco sheet screening device with orthogonal cosine wave conveying, which includes a feeder 3, a vibrating screen 4, a broken material outputter 5, a tobacco sheet outputter 6, and a conveying plate 7;

[0046] The vibrating screen 4 includes a conveying and screening plate 1, and the conveying and screening plate 1 is provided with screening holes 2;

[0047] The conveying and screening plate 1 is in material communication with the tobacco sheet output device 6 through the conveying plate 7, and the material output device 5 is arranged below the vibrating screen 4;

[0048] The surface transmission surface of the conveying and screening plate 1 is set as a corrugated surface, and the corrugated surface is a space surface formed by the orthogonal intersection of a surface formed by moving along a first trajectory and a surface formed by moving along a second trajectory. The first trajectory is a cosine curve in a first vertical plane, and the tangents at the wave peaks and valleys of the first trajectory are parallel to the width direction of the screening plate. The second trajectory is a cosine curve in a second vertical plane, and the tangents at the wave peaks and valleys of the second trajectory are parallel to the length direction of the screening plate. The first vertical plane and the second vertical plane are perpendicular and orthogonal to each other;

[0049] The length direction of the conveying and screening plate 1 is the conveying direction of the tobacco sheet material.

[0050] The re-dried tobacco chip screening device for orthogonal cosine wave conveying can be used for separating tobacco chips in re-dried tobacco chips in the re-drying process or for separating stem pieces in cut tobacco in the cut tobacco manufacturing process, and includes the following steps: The re-dried tobacco chips or cut tobacco are input as materials into the conveying and screening plate 1 in the vibrating screen 4 by the feeder 3 to complete their loosening and even distribution, and the tobacco chip screening is completed by the screening holes 2. The tobacco chips are output by the material output device 5, and the tobacco sheets or stem pieces are output by the conveying plate 7 through the tobacco sheet output device 6. As Figure 1 described.

[0051] In this embodiment, as Figure 1 described, for the threshing and redrying production line, the feeder 3 can be an on-line output port on the threshing and redrying line, and the material output device 5 and the tobacco sheet output device 6 can be docked to the transmission device on the redrying production line.

[0052] When no screening holes are designed on the conveying and screening plate 1, it is installed on the vibrating trough conveyor line for loose conveying and even distribution of tobacco materials.

[0053] As Figure 2 described, in this embodiment, a three-dimensional coordinate system YXZ is established, and the corrugated surface of the conveying and screening plate 1 is designed. The surface function equation is y = f(x, z), y = a cos(ω1x), and y = b cos(ω2z). The z direction is the material conveying direction, that is, the length direction L of the conveying and screening plate 1, and the x direction is the width direction B.

[0054] That is, in the three-dimensional coordinate system, the waveform surface formed by the curve y = a cos(ω1x) extending in the z-axis direction according to the curve law of y = b cos(ω2z) is the transmission surface. Given a y value, there are corresponding x and z coordinate values corresponding to it.

[0055]

[0056] Here, k1 and k2 are integers.

[0057] Obviously, the corrugated surface is a spatial surface formed by the orthogonality of two cosine curves. Since the corrugated surface has an array of alternating wave peaks and wave valleys, when no screening holes are designed, the conveying and screening plate 1 can be used for the loose conveying and even distribution of tobacco materials such as tobacco leaves on the tobacco leaf redrying production line and cut tobacco on the cut tobacco production line, online solving problems such as material agglomeration and adhesion, improving the process effect, and having a wide range of application fields.

[0058] Regarding the lightweight design of the vibrating trough, as the conveying and screening plate 1 of the vibrating trough, it can also be formed and pressed from sheet metal materials with a thickness of 2 - 4 mm. For example Figure 3 as described above, the thickness of the thin part is designed to be 2 mm.

[0059] When screening broken tobacco leaves in the tobacco leaf redrying process, select the diameter size d = 6 mm of the screening holes 2 on the conveying and screening plate 1. The screening holes 2 are manufactured on the wave trough line for the cosine curve screening of broken tobacco leaves in redrying. The processing direction of the screening holes 2 is perpendicular to the plane of the conveying and screening plate 1.

[0060] In the space coordinate system constructed by the first vertical plane and the second vertical plane, the equation of the first trajectory is y = a cos(ω1x), with a wavelength of λ1, and the equation of the second trajectory is y = b cos(ω2z), with a wavelength of λ2. Preferably, a = 1, b = 1, ω1 = 1, and ω2 < 1.

[0061] This embodiment is designed according to a = 1, b = 1, ω1 = 1, and ω2 = 0.5. When a = 1, there are two mutually orthogonal intersection points within any period of the cosine curve, which has a good loosening force on the material; ω2 < 1 has a faster or smoother conveying effect on the material.

[0062] For example Figures 4 - 5 as described above, further, let the surface function equation of the conveying and screening plate 1 be designed as y = f(x, z), y = cos(x), and y = cos(0.5z). Then, it can be set that the amplitude of y = cos(x) is designed as a = 5 mm, the wavelength λ1 is designed as 31.416 mm, the amplitude of y = cos(0.5z) is designed as b = 5 mm, and the wavelength λ2 is designed as 62.832 mm.

[0063] Or in terms of length unit mm: y = 5 cos(2πx / λ1), y = 5 cos(πz / λ2).

[0064] For example Figure 5 , it is set that the design of the length L and width B of the conveying and screening plate 1 is rounded according to the golden ratio of 0.618. The width B = 816.816 mm, which contains 26λ1 in total, and the length L = 1319.472 mm, which contains 21λ2 in total. The conveying or screening of the material is carried out along the z - axis direction.

[0065] The inventor of the present utility model believes that: by using the golden section ratio coefficient (about 0.618) to design the conveying vibrating sieve plate 1, it is mainly considered that the trough line screening method on the orthogonal surface of the present utility model has a high material screening and loosening efficiency, and has a beautiful appearance and a compact screening line design.

[0066] The screening holes 2 are manufactured on the trough line, and the cosine basis function of the trough line is: y = bcos(ω2z), x = nπ, where n is a positive integer representing the trough line number.

[0067] In the embodiment, for the trough line equation, when b = 1 and ω2 = 0.5, y = cos(0.5z), x = nπ, and n represents the trough number of y = cos(x) along the x-axis direction.

[0068] Such as Figure 5 , on the trough line within one wavelength λ2, for example, 5 screening holes 2 are processed by the average interpolation method, the aperture is selected as ¢d = 6mm according to the re-drying process, and the processing direction is perpendicular to the XOZ plane, then the coordinate positions of each hole are:

[0069]

[0070] In the formula, x0 and z0 represent the position of the starting hole 0, Figure 5 Among them, x0 = λ1 / 2 = 31.416 / 2 = 15.708mm, z0 = λ2 / 2 = 62.832 / 2 = 31.416mm, which is located at the lowest point of the trough line.

[0071] n represents the trough number of y = cos(x), and k represents the hole number on the curve of y = cos(0.5z).

[0072] For example, n = 9 represents the 9th trough line, and k = 9 represents the 9th hole on the trough line, and its coordinates are:

[0073]

[0074] According to the requirements of the cigarette making process, when aiming at the requirements of the cigarette making process, when used to screen the "sesame slice" broken tobacco in the cut tobacco and complete the separation of the stem chips in the cut tobacco, select the diameter size d = 5mm of the screening holes 2 on the conveying screening plate 1, manufacture the screening holes 2 on the trough line in the plane perpendicular to the xoz plane, for the cosine curve screening of the broken tobacco in the cut tobacco and the separation of the stem chips in the cut tobacco, and the screening plate 2 is connected to the cigarette making line.

[0075] Such as Figure 5, according to the requirements of the cut tobacco process, it is necessary to screen out the broken tobacco in the cut tobacco. The designed diameter size d of the screening hole 2 is 5 mm, and the others are designed as above, which can meet the quality requirements of the cut tobacco and cigarette manufacturing processes. Since the cut tobacco material moves along a curve in the trough, the separation of the stems in the cut tobacco can be completed simultaneously.

[0076] In addition, since both sides of any trough are smoothly changed to the wave crest by the sine-cosine curved surface, and the wave crest has a better effect of loosening the material, so that the small-size materials are gathered and conveyed in the trough. Therefore, the screening holes designed in this technical solution have the best screening effect on the trough line.

[0077] The above uses examples to introduce the screening methods of broken tobacco in re-dried tobacco leaves and "sesame flakes" in cut tobacco, and the "stem separation" technology in cut tobacco. This trough line screening method has significant advantages. Combined with the simple harmonic vibration of a better vibrating trough, appropriate amplitude and frequency, it ensures the directional movement of the tobacco material on the orthogonal cosine wave surface of the screening plate, improving its loose conveying effect and screening efficiency.

[0078] Since this technical solution uses the cosine basis function in the orthogonal system to design the conveying curved surface, according to the curve area integral theory, the effective area of the screening surface of the conveying and screening plate 1 is much larger than that of a flat plate with the same length and width dimensions. According to the physical mechanics theory, this orthogonal cosine wave surface has high efficiency in loosening the material and low breakage characteristics. Therefore, this technical solution is of great significance for improving the conveying and screening performance of the production line or shortening the production length.

[0079] Based on the development of today's manufacturing technology, especially the progress of CAD / CAM modeling technology and multi-dimensional processing technology, there is no technical difficulty in manufacturing the orthogonal cosine wave surface, but the manufacturing cost is much higher than that of manufacturing a flat conveying and screening plate.

[0080] Finally, it is stated that sine or cosine has the same properties in this patent, that is, the sine curve or cosine curve of the same parameter only has a phase difference; in the embodiment, the values of the screening hole d = 5 mm and d = 6 mm are respectively the process execution standards for screening "sesame flakes" in cut tobacco and "broken tobacco" in tobacco leaves in the tobacco industry.

[0081] The above is only the preferred embodiment of the present utility model, which is illustrative rather than restrictive to the present utility model. The structures and connection methods of the various components in the present utility model can all be changed. Any equivalent transformation and improvement made on the basis of the technical solution of the present utility model should not be excluded from the protection scope of the present utility model.

Claims

1. A re-baked tobacco flakes screening device with orthogonal cosine wave conveying, characterized in that: It comprises a feeder (3), a vibrating screen (4), a crushed material output device (5), a cigarette sheet output device (6), and a conveying plate (7); The vibrating screen (4) comprises a conveying screening plate (1), and the conveying screening plate (1) has screening holes (2); The conveying and screening plate (1) is connected to the tobacco sheet output device (6) through the conveying plate (7), and the crushed material output device (5) is located below the vibrating screen (4); The surface transmission surface of the conveying screen plate (1) is set as a corrugated surface, and the corrugated surface is a spatial curved surface formed by orthogonal intersection of a curved surface formed by moving along a first track and a curved surface formed by moving along a second track, the first track is a cosine curve in a first vertical plane, and the tangents of the first track at the crests and troughs are parallel to the width direction of the conveying screen plate, the second track is a cosine curve in a second vertical plane, and the tangents of the second track at the crests and troughs are parallel to the length direction of the conveying screen plate, and the first vertical plane and the second vertical plane are perpendicular to each other; The length direction of the conveying screening plate (1) is the conveying direction of the tobacco sheet material.

2. The orthogonal cosine wave conveying re-baked shredded tobacco flakes screening device according to claim 1, characterized in that: When the conveying screening plate (1) is a "thin piece", the thickness of the thin piece is 2 to 4 mm.

3. The orthogonal cosine wave conveying re-baked shredded tobacco flakes screening device according to claim 1, characterized in that: In the spatial coordinate system constructed by the first vertical plane and the second vertical plane, the equation of the first trajectory is y=acos(ω1x), wavelength λ1, and the equation of the second trajectory is y=bcos(ω2z), wavelength λ2, where a=1, b=1, ω1=1, ω2<1.

4. The orthogonal cosine wave conveying re-baked shredded tobacco flakes screening device according to claim 3, characterized in that: In the three-dimensional coordinate system, the waveform surface formed by the y=acos(ω1x) curve extending in the z-axis direction according to the law of the y=bcos(ω2z) curve is the transmission surface. Given a y value, there are corresponding x and z coordinate values ​​corresponding to it: Here, k1 and k2 are integers.

5. The orthogonal cosine wave conveying re-baked shredded tobacco flakes screening device according to claim 1, characterized in that: The screening holes (2) are manufactured on the trough line, the cosine basis function of the trough line is: y=bcos(ω2z), x=nπ, n is a positive integer representing the trough line number, and the processing direction of the screening holes (2) is perpendicular to the plane of the conveying screening plate (1).

6. The orthogonal cosine wave conveying re-baked shredded tobacco flakes screening device according to claim 1, characterized in that: According to the requirements of the redrying process, when used to screen the broken tobacco in the tobacco sheets, the diameter size d of the screening hole (2) on the conveying screening plate (1) is selected to be 6 mm, and the screening hole (2) is manufactured on the trough line, which is used for cosine curve screening of the redrying broken tobacco sheets; The processing direction of the screening holes (2) is perpendicular to the plane of the conveying screening plate (1).

7. The orthogonal cosine wave conveying re-baked shredded tobacco flakes screening device according to claim 1, characterized in that: According to the requirements of the tobacco making process, when screening the "sesame slices" of broken tobacco in the tobacco shreds and completing the separation of stems from the tobacco shreds, the diameter size d of the screening hole (2) on the conveying screening plate (1) is selected to be 5 mm, and the screening hole (2) is manufactured on the trough line perpendicular to the xoz plane. The screening hole (2) is manufactured on the trough line and is used for cosine curve screening of broken tobacco in the tobacco shreds and separation of stems from the tobacco shreds. The conveying screening plate (1) is connected to the tobacco making line; The processing direction of the screening holes (2) is perpendicular to the plane of the conveying screening plate (1).

8. The orthogonal cosine wave conveying re-baked shredded tobacco flakes screening device according to claim 1, characterized in that: The length L and width B of the conveying screening plate (1) are designed to be rounded off according to the golden ratio of 0.618.

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