Tobacco lamina classifying, orthogonal screening and large tobacco lamina slitting device suitable for medium and thin cigarette primary processing

Abstract

The utility model discloses a tobacco sheet classifying, orthogonal screening and large tobacco sheet slitting device suitable for medium and thin cigarette primary processing. The tobacco sheet classifying, orthogonal screening and large tobacco sheet slitting device comprises an input line, a two-stage vibrating screen, a two-stage screen plate, a conveying plate, a slitting unit, a blanking groove and a conveying line. Re-dried tobacco strips are input into the first-stage vibrating screen through the input line, large and medium tobacco strips are screened through the screening holes, medium tobacco strips are input into the conveying line through the blanking groove, the large tobacco strips are input into the slitting device to be slit in the size of 25.4 mm and then input into the second-stage vibrating screen again, and after the large and medium tobacco strips are screened through the screening holes and slit in the size of 25.4 mm, the large and medium tobacco strips are conveyed to the conveying line through the blanking groove. The two-stage sieve plate adopts a first trajectory equation y = 10cos (x / lambda2 * 2pi) and a wavelength lambda2 = 62.832 mm, and adopts a second trajectory equation y = 10cos (z / lambda1 * 2pi) and a wavelength lambda1 = 125.664 mm to design a space orthogonal screening surface. According to the utility model, re-dried tobacco strips are classified, large tobacco strips are accurately cut, a tobacco shred production line or a threshing and re-drying line can be connected, and finally, the tobacco shred filament rate is reduced, and the quality of medium and fine cigarettes is improved.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the field of tobacco, relates to tobacco leaf raw material processing technology and cigarette production technology, is applied to the on-line cut tobacco classification and slitting on the cut tobacco production or redrying production line, especially adapts to the cut tobacco production line of medium and thin cigarettes, and specifically relates to a cut tobacco classification, orthogonal screening and large cut tobacco slitting device and method for medium and thin cigarette cut tobacco. BACKGROUND

[0002] It is particularly important to control the size of cut tobacco after threshing on the threshing and redrying production line, and is generally controlled by a beater and a frame; the threshing and redrying adopts multi-stage threshing and multi-stage air separation, the larger the size of cut tobacco produced is, the smaller the crushing is, and the lower the broken pieces and broken powder are, and vice versa. Generally speaking, cut tobacco larger than 25.4 mm is called large cut tobacco, and cut tobacco larger than 12.5 mm and smaller than 25.4 mm is called medium cut tobacco. In the redrying of finished cut tobacco, if the medium cut rate is increased and the large cut rate is reduced, the crushing rate of cut tobacco will be increased.

[0003] The cut tobacco entering the cut tobacco process often has a high large cut tobacco content, obviously, the long filament rate of the cut tobacco is also high. Due to the high long filament rate of the cut tobacco transported to the cigarette process for a long distance, factors such as the winding and agglomeration of the cut tobacco in pneumatic conveying will cause product quality defects such as loose and empty cigarettes and empty ends in the cigarette process, which cannot be easily solved by relying on the functions of the cigarette machine such as adjusting the reduction disc and the suction belt, especially for medium and thin cigarettes, the cigarette product quality defects will be more.

[0004] Research and application show that the high long filament rate of the cut tobacco is the main factor. Therefore, in the redrying process, increasing the medium cut rate, that is, reducing the large cut rate, can effectively control the long filament rate in the cut tobacco link, and the cut tobacco structure of medium and thin cigarettes will be improved, which is beneficial to improving the cigarette quality. Obviously, it is difficult to control the size of the cut tobacco after threshing by the beater and the frame of the threshing machine, and therefore, in the redrying process, a precise large and medium cut screening process should be designed to improve the size consistency, etc.

[0005] In fact, according to the current general technology, it is difficult to realize the large and medium cut screening of the redried cut tobacco, and the difficulties lie in the physical characteristics of the redried cut tobacco such as plasticity, size variability, mutual clamping, wrapping or adsorption of cut tobacco, light weight and insignificant difference, etc. In particular, the cut tobacco material at the outlet of the threshing machine group is difficult to realize loose and uniform distribution due to the adhesion and accumulation or agglomeration, and it is even more difficult to classify.

[0006] Through scientific research, the applicant has developed a method using a sinusoidal basis function and two orthogonal cosine curves to design a conveying sieve plate. The sinusoidal wave surface provides the most efficient loosening effect for tobacco flakes, allowing large tobacco flakes to be conveyed along the crests or between the two wave surfaces, while smaller tobacco flakes are conveyed along the sinusoidal curve within the troughs. By designing 1-inch sieve holes on the trough lines, medium-sized tobacco flakes can be effectively separated. The sorted large tobacco flakes are then cut using a disc cutter, resulting in a high medium-sized tobacco flake ratio entering the cigarette making process. This effectively avoids a high filament ratio in the cigarette making process, meeting the stringent process requirements for tobacco structure in medium and fine cigarettes. This method has broad application prospects for cigarette rolling technology and improving cigarette quality.

[0007] To address the aforementioned problems, this utility model is proposed. Utility Model Content

[0008] To address at least one aspect of the aforementioned problems, this utility model discloses a device and method for classifying, orthogonally screening, and cutting large sheet tobacco in the production of medium and fine cigarettes. The device includes an input line, two-stage vibrating screens, two-stage sieve plates, screening holes, a conveyor plate, a cutting device, an anvil, a feeding chute, a conveyor line, a handwheel, a dovetail groove adjustment frame, and a variable frequency motor. The re-dried sheet tobacco is input into the first-stage vibrating screen via the input line, and then... The screening holes complete the screening of large and medium-sized tobacco flakes. Medium-sized tobacco flakes are fed into the conveyor line via the chute, while large-sized tobacco flakes are fed into the slitting device for 25.4mm cutting and then fed back into the secondary vibrating screen. After the screening holes complete the screening of large and medium-sized tobacco flakes and the 25.4mm size cutting, the tobacco is conveyed to the conveyor line by the discharge chute. The two-stage screen plates adopt a spatial orthogonal screening surface with the first trajectory equation y=10cos(x / λ2×2π) and wavelength λ2=62.832mm and the second trajectory equation y=10cos(z / λ1×2π) and wavelength λ1=125.664mm. The screening holes are manufactured at the trough of the curve y=10cos(x / λ2×2π) and are evenly distributed in 5 holes along the wavelength λ1 of the curve y=10cos(z / λ1×2π). This utility model implements the classification of re-dried tobacco flakes and precise cutting of large tobacco flakes. It can be connected to the tobacco processing production or leaf re-drying line, ultimately reducing the long filament rate of tobacco and improving the quality of medium and fine cigarettes.

[0009] The technical solution of this utility model is as follows:

[0010] This utility model provides a sheet tobacco classification, orthogonal screening and large sheet tobacco cutting device adapted to the production of medium and fine cigarettes. It includes an input line 1, a primary vibrating screen 2, a first discharge chute 7, a first conveying plate 5, a first cutting unit 6, a secondary vibrating screen 8, a second discharge chute 19, a second conveying plate 11, a second cutting unit 12, a third discharge chute 14, and a conveying line 15.

[0011] The primary vibrating screen 2 includes a primary screen plate 3, which has first screening holes 4.

[0012] The secondary vibrating sieve 8 includes a secondary sieve plate 9, which has a second sieving hole 10.

[0013] The screening surfaces of the primary screen plate 3 and the secondary screen plate 9 are spatial curved surfaces, constructed by establishing a three-dimensional spatial coordinate system on mutually perpendicular orthogonal planes. The mathematical function of the spatial curved surface of the screening surface is y = f(x,z). The equation of the first trajectory is y = 10cos(x / λ2×2π), with wavelength λ2 = 62.832mm and wave height 20mm. The equation of the second trajectory is y = 10cos(z / λ1×2π), with wavelength λ1 = 125.664mm and wave height 20mm. The x-direction along the first trajectory is the width direction of the screen plate, and the z-direction along the second trajectory is the length direction of the screen plate, i.e., the screening and conveying direction of the tobacco material.

[0014] Preferably, sieve holes are made at the trough of the cosine curve y = 10cos(x / λ2 × 2π) of the first trajectory, and according to the cosine curve y = 10cos(z / λ1 × 2π). Five sieve holes are evenly distributed within one wavelength λ1 = 125.664 mm, with a hole diameter of [missing information]. The screening holes are manufactured according to the normal of the cosine curve y = 10cos(z / λ1×2π), that is, the screening holes on the crests and troughs are parallel to each other and perpendicular to the xoz plane. The screening holes on the wave surface have an angle with the z-axis, and their normal vector is calculated by the first derivative of y = 10cos(z / λ1×2π).

[0015] Preferably, the length of the primary sieve plate 3 is greater than or equal to the length of the secondary sieve plate 9.

[0016] Preferably, both the first slitting unit 6 and the second slitting unit 12 include a handwheel 16, a dovetail groove adjustment frame 17, a variable frequency motor 18, a disc cutter 61, a sleeve rake wheel 62, and an anvil 13. The dovetail groove adjustment frame 17 includes a convex dovetail groove 64 and a concave dovetail groove 69 that match each other. The handwheel 16 is used to precisely adjust the lifting and lowering of the convex dovetail groove 64, thereby adjusting the gap of the arc groove 63 between the disc cutter 61 and the anvil 13.

[0017] Preferably, a bearing sleeve 91, a bearing 92, a rotating shaft 90, and a bearing end cap 93 are installed on the movable convex dovetail groove 64;

[0018] The disc cutter 61 and the sleeve rake wheel 62 are sequentially mounted on the rotating shaft 90, and the variable frequency motor 18 is mounted through the keyway 94 and the coupling to drive the disc cutter 61 to rotate and slice the tobacco.

[0019] Preferably, the sleeve rake wheel 62 includes a rake wheel arc 62-1 and a rake wheel groove 62-2, and the rake motion and pressing of the tobacco is accomplished by the rake wheel arc 62-1 and the rake wheel groove 62-2 on the sleeve rake wheel 62.

[0020] Preferably, the stability of the dovetail groove adjustment bracket 17 is achieved by the adjustment handwheel 67 and the clamping screw 70;

[0021] The dovetail groove adjusting bracket 17 of the dovetail groove mechanism is installed using mounting screws 65;

[0022] The anvil 13 is installed using screws through the countersunk hole 66.

[0023] Preferably, the optimal gap between the circular groove 63 between the disc-shaped cutter 61 and the anvil 13 is 1-2 mm, so as to improve the tobacco slicing effect;

[0024] The distance T between any two adjacent disc cutters 61 is 25.4 mm (equal to...). value).

[0025] Preferably, the dovetail angle of the convex dovetail groove 64 and the concave dovetail groove 69 is 55°.

[0026] The second aspect of this utility model provides a method for classifying, orthogonally screening, and cutting large pieces of tobacco in the production of medium- and fine-sized cigarettes. It utilizes the tobacco classification, orthogonal screening, and large piece cutting device described in the first aspect of this utility model, comprising: re-dried tobacco sheets input from the input line 1 to the primary vibrating screen 2, and separated by the primary screen plate 3 and the first screening holes 4. After the screening and classification of medium and large tobacco flakes are completed, the medium tobacco flakes are fed into the conveyor line 15 through the first feed chute 7, and the large tobacco flakes are fed into the first cutting unit 6 through the first conveyor plate 5 to be cut to a size of 25.4mm. Then, they are fed into the secondary vibrating screen 8, and are screened by the secondary screen plate 9 and the second screening holes 10. After the screening and classification of large and medium-sized tobacco leaves are completed, the medium-sized tobacco leaves are fed into the conveyor line 15 through the second discharge chute 19, and the large tobacco leaves are fed into the second cutting unit 12 through the second conveyor plate 11 to complete the cutting to a size of 25.4mm. After that, they are conveyed into the conveyor line 15 through the third discharge chute 14.

[0027] The present invention provides a device and method for classifying, orthogonally screening, and cutting large sheet tobacco in the production of medium and fine cigarettes, which has the following beneficial effects:

[0028] 1) Solving common technical problems

[0029] Due to the physicochemical characteristics of tobacco leaves, such as their tendency to stick together, clamp and bind, and clump together, coupled with their large flow rate, it is difficult and ineffective to achieve loose and uniform distribution using a flat vibrating screen, whether on a leaf re-drying production line or on a production line after the re-moistening process in a tobacco processing line. The present technical solution addresses this by using a cosine curve y = 10cos(x / λ2 × 2π), wavelength λ2 = 62.832 mm, and wave height 20 mm for the first trajectory of the screen plate. The peaks and troughs of this curve effectively loosen and evenly distribute the clumps of tobacco leaves. Furthermore, by using a cosine curve y = 10cos(z / λ1 × 2π), wavelength λ1 = 125.664 mm, and wave height 20 mm orthogonal to the first trajectory using the cosine curve y = 10cos(x / λ2 × 2π), the theoretical maximum height difference within one λ1 can reach 40 mm, further improving the efficiency of loosening and evenly distributing the tobacco leaves. Therefore, by optimizing the frequency and amplitude of the sinusoidal basis function, a series of technical problems related to the looseness of tobacco materials in the tobacco industry can be effectively solved.

[0030] 2) Solve key technical problems

[0031] Multi-stage leaf threshing and multi-stage air separation to separate the stems and leaves of tobacco leaves, with the size of the tobacco flakes controlled by threshing rollers and frames, is a key step in the re-drying process. Clearly, precise classification of tobacco flakes by size is crucial, but achieving both a high rate of medium-sized flakes and a low breakage rate is difficult. The orthogonal screening technology in this technical solution provides a better solution. In this technical solution, theoretically, tobacco flakes larger than λ1×λ2 (125.664×62.832mm) square will be transported in a floating manner at the crest of the wave, while those smaller will be transported within the two wave surfaces or troughs. Within the trough size λ2=62.832mm, if the tobacco flake size is less than 25.4mm square, it will be... Screening separation. For the re-drying process, medium-sized tobacco leaves are separated and classified, preventing them from entering the next leaf-cutting process. This effectively avoids breakage of small and medium-sized tobacco leaves, improves process efficiency, and effectively reduces the cost of tobacco raw materials.

[0032] For the tobacco processing process, especially for medium and slim cigarettes, where the classification of tobacco leaves by size is particularly stringent, this technical solution provides the optimal solution. Because... The screening aperture is designed on the cosine curve y = 10cos(z / λ1 × 2π), and also on the trough of the cosine curve y = 10cos(x / λ2 × 2π). Therefore, its screening efficiency and screening penetration are the highest, which is superior to the currently used planar vibrating screen, especially: The size of the screening holes can be further adjusted according to the requirements of the cigarette production process.

[0033] 3) Solve the problem of precise tobacco leaf cutting

[0034] To address the quality issues of loose and porous cigarettes caused by long tobacco shreds resulting from the tobacco processing of large-leaf cigarettes, this technical solution provides a two-stage screening and two-stage cutting method. The aim is to screen out the large-leaf tobacco shreds for cutting, avoiding the breakage of smaller shreds. This cutting device boasts high precision because the cutting size is determined by the distance between adjacent disc cutters. The value is 25.4mm, and this dimension is determined by the axial dimension of the sleeve rake wheel and is adjustable and designable, thus ensuring accuracy. The sleeve rake wheel is designed with a rake wheel arc and a rake wheel groove to complete the rakeing and pressing of the tobacco. The disc cutter can be made of high-speed steel W18Cr4V, and a cutting board with an arc groove is designed below the disc cutter. Therefore, the tobacco breakage rate is lower during slicing.

[0035] A dovetail groove adjustment frame was also designed. The design and manufacturing of its dovetail groove guide rail follows the standard JB / ZQ4241-1997. The material used is HT200, which is scraped and polished. The guide rail accuracy can reach the micron level, improving its cutting accuracy and stability.

[0036] Since the orthogonal screening and precision cutting technologies in this technical solution are important and crucial in the tobacco processing industry, they have a significant role in promoting the development of tobacco machinery and equipment technology in the tobacco industry. Similarly, they also have promotional value in other industrial application fields such as food, medicine, and mining. Attached Figure Description

[0037] To better understand the above and other objects, features, advantages, and functions of this utility model, reference can be made to the embodiments shown in the accompanying drawings. The same reference numerals in the drawings refer to the same parts. Those skilled in the art should understand that the drawings are intended to schematically illustrate preferred embodiments of this utility model and do not limit the scope of this utility model in any way; the parts in the drawings are not drawn to scale.

[0038] In the attached diagram:

[0039] Figure 1 This is a schematic diagram of the structure of the device for classifying, orthogonally screening, and cutting large sheet tobacco in the production of medium and fine cigarettes according to this utility model.

[0040] Figure 2 A schematic diagram of the primary sieve plate and the secondary sieve plate in a three-dimensional coordinate system in this embodiment of the present invention;

[0041] Figure 3 This is a schematic diagram of the length, width, and sieving hole design of the primary and secondary sieve plates in this embodiment of the utility model;

[0042] Figure 4 This utility model Figure 3 The cross-sectional view in the figure shows a schematic diagram of the normal markings representing the machining direction of the screening holes;

[0043] Figure 5 This is a schematic diagram illustrating the cutting principle and the installation and adjustment principle of the dovetail groove of the precision dovetail groove adjustment frame in this utility model embodiment;

[0044] Figure 6 This is a schematic diagram illustrating the assembly principle of the bearings, disc cutter, sleeve rake wheel, and anvil on the rotating shaft in an embodiment of this utility model.

[0045] Figure 7 This utility model embodiment is a control diagram of the slicing tobacco size or a schematic diagram of the size design of the disc cutter and the sleeve rake wheel;

[0046] Figure 8 This is a schematic diagram of the design of the sleeve rake wheel according to an embodiment of this utility model;

[0047] Figure 9 This is a schematic diagram of the cutting board design according to an embodiment of this utility model;

[0048] Figure 10 This is a schematic diagram illustrating the principle of adjusting the position and size of the disc-shaped cutter and the cutting board in an embodiment of this utility model.

[0049] The corresponding names of the reference numerals in the attached drawings are as follows: 1. Input line; 2. Primary vibrating screen; 3. Primary screen plate; 4. First screening hole; 5. First conveyor plate; 6. First cutting unit; 7. First discharge chute; 8. Secondary vibrating screen; 9. Secondary screen plate; 10. Second screening hole; 11. Second conveyor plate; 12. Second cutting unit; 13. Anvil; 14. Third discharge chute; 15. Conveyor line; 16. Handwheel; 17. Dovetail groove adjustment frame; 18. Variable frequency motor; 19. Second discharge chute;

[0050] 61. Disc cutter; 62. Sleeve rake wheel; 62-1. Rake wheel arc; 62-2. Rake wheel groove; 63. Arc groove; 64. Convex dovetail groove; 65. Mounting screw; 66. Countersunk hole; 67. Adjusting handwheel; 68. Fastening screw; 69. Concave dovetail groove; 70. Clamping screw;

[0051] 90. Shaft; 91. Bearing sleeve; 92. Bearing; 93. Bearing end cap; 94. Keyway. Detailed Implementation

[0052] The above-mentioned and other technical features and advantages of this utility model will be described in more detail below with reference to the accompanying drawings. In the description of this utility model, it should be understood that the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this utility model, "a plurality of" means at least two, unless otherwise explicitly specified.

[0053] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0054] In this utility model, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0055] like Figure 1 To address at least one aspect of the aforementioned problems, this utility model provides a device and method for classifying, orthogonally screening, and cutting large sheet tobacco in the production of medium and fine cigarettes. The device includes an input line 1, a primary vibrating screen 2, a first discharge chute 7, a first conveying plate 5, a first cutting unit 6, a secondary vibrating screen 8, a second discharge chute 19, a second conveying plate 11, a second cutting unit 12, a third discharge chute 14, and a conveyor line 15.

[0056] The primary vibrating screen 2 includes a primary screen plate 3, which has first screening holes 4.

[0057] The secondary vibrating screen 8 includes a secondary screen plate 9, and the secondary screen plate 9 has a second screening hole 10.

[0058] A method for classifying, orthogonally screening, and cutting large tobacco leaves in the production of medium- and fine-sized cigarettes is provided. The aforementioned device for classifying, orthogonally screening, and cutting large tobacco leaves in the production of medium- and fine-sized cigarettes includes: re-dried tobacco leaves are input into the primary vibrating screen 2 via the input line 1, and separated by the primary screen plate 3 and the first screening holes 4. After the screening and classification of medium and large tobacco flakes are completed, the medium tobacco flakes are fed into the conveyor line 15 through the first feed chute 7, and the large tobacco flakes are fed into the first cutting unit 6 through the first conveyor plate 5 to be cut to a size of 25.4mm. Then, they are fed into the secondary vibrating screen 8, and are screened by the secondary screen plate 9 and the second screening holes 10. After the screening and classification of large and medium-sized tobacco leaves are completed, the medium-sized tobacco leaves are fed into the conveyor line 15 through the second discharge chute 19, and the large tobacco leaves are fed into the second cutting unit 12 through the second conveyor plate 11 to complete the cutting to a size of 25.4mm. After that, they are conveyed into the conveyor line 15 through the third discharge chute 14.

[0059] like Figure 2 The screening surfaces of the primary screen plate 3 and the secondary screen plate 9 are spatial curved surfaces. To construct a three-dimensional spatial coordinate system on mutually perpendicular orthogonal planes, the mathematical function of the spatial curved surface of the screening surface is y = f(x,z). The equation of the first trajectory is y = 10cos(x / λ2 × 2π), with a wavelength λ2 = 62.832 mm and a wave height of 20 mm. The equation of the second trajectory is y = 10cos(z / λ1 × 2π), with a wavelength λ1 = 125.664 mm and a wave height of 20 mm. The x-direction along the first trajectory is the width direction of the screen plate, and the z-direction along the second trajectory is the length direction of the screen plate, i.e., the screening and conveying direction of the tobacco material.

[0060] like Figures 2 to 4 Description.

[0061] At the trough of the cosine curve y = 10cos(x / λ² × 2π) on the first trajectory, sieve holes are made according to the cosine curve y = 10cos(z / λ₁ × 2π). Five sieve holes are evenly distributed within a wavelength λ₁ = 125.664 mm, with a diameter of [missing information]. The screening holes are manufactured according to the normal of the cosine curve y = 10cos(z / λ1×2π), that is, the screening holes on the crests and troughs are parallel to each other and perpendicular to the xoz plane. The screening holes on the wave surface are angled with the z-axis, and their normal vector is calculated by the first derivative of y = 10cos(z / λ1×2π).

[0062] Example Figure 3 In the middle, the first-stage sieve plate 3 and the second-stage sieve plate 9 are designed with a width B = 840.05 mm and a length L1 = 1319.47 mm.

[0063] Along the trough line within a wavelength range of λ1 = 125.66 mm, five first screening holes (3) and second screening holes (9) are machined using the average interpolation method, with the following hole diameters: Machine along the normal vector direction of the trough line according to the coordinate position of each hole. The coordinate positions of each hole are as follows:

[0064]

[0065] In the formula, x0 and z0 represent the starting hole position 0;

[0066] n represents the trough number of y = 10cos(x / λ2×2π), and k represents the hole number on the curve y = 10cos(z / λ1×2π).

[0067] See the example Figure 2 In the middle: starting hole 0 position, x0=λ1 / 2=62.832 / 2=31.416mm, z0=λ2 / 4=125.664 / 4=31.416mm.

[0068] If we calculate the position of the hole on the curve y = 10cos(x / λ²×2π) along the x-axis (n=5th trough line), and the position of the hole on the curve y = 10cos(z / λ¹×2π), then the coordinates are:

[0069]

[0070] See Figure 2 , 4 As stated above.

[0071] The normal vector is used to drill holes according to the first screening hole 4 on the trough line in three-dimensional space. Because the component of the normal vector on the x-axis is 0 in the coordinate system yoz for the trough line curve y=10cos(z / λ1×2π), the following calculations are performed in the coordinate system yoz:

[0072] The first derivative of y = 10cos(z / λ1×2π) gives:

[0073]

[0074] If the slope of the tangent line P to the curve at point z is the point z, then the slope of the normal line N at point z is:

[0075] N = -1 / y

[0076] Then the vector of the normal N can be determined.

[0077] Figure 4 In the diagram, N1 is the normal to the sieve hole position on the trough, and P is the tangent at that position; N2 is the normal to the sieve hole position on the crest; N3, P3, N4, and P4 are the normal and tangent at the sieve hole positions on the wave surface, respectively.

[0078] Calculating the normal vector (or direction cosine) of a point on a curve is a fundamental technology in NC machine tool manufacturing or precision testing. In CNC numerical control, it can control the movement direction of cutting tools or coordinate measuring machine probes.

[0079] The length of the primary sieve plate 3 is greater than or equal to the length of the secondary sieve plate 9.

[0080] Since medium-sized tobacco flakes are separated on the primary vibrating screen 2, the flow rate of tobacco flakes is greater than that of the secondary vibrating screen 8. Therefore, the length of the primary screen plate 3 is greater than or equal to the length of the secondary screen plate 9. In this embodiment, the length of both vibrating screens is L1.

[0081] Since the tobacco sheet flow rate can reach 10t / h in normal tobacco production, the length of the vibrating screen can be increased, and the efficiency of tobacco sheet cutting can also be improved by using a variable frequency motor 18.

[0082] like Figure 5 The first cutting unit 6 and the second cutting unit 12 both include a handwheel 16, a dovetail groove adjustment frame 17, a variable frequency motor 18, a disc cutter 61, a sleeve rake wheel 62, and an anvil 13. The dovetail groove adjustment frame 17 includes a convex dovetail groove 64 and a concave dovetail groove 69 with matching concave and convex shapes. The lifting dimension h of the convex dovetail groove 64 is precisely adjusted by the handwheel 16. Figure 10 The above describes a method to ensure an optimal gap, such as 1-2 mm, between the disc-shaped cutter 61 and the arc groove 63 on the cutting board 13, in order to improve the tobacco slicing effect. The stability of the dovetail groove adjustment bracket 17 is achieved by the adjustment handwheel 67 and the clamping screw 70; the distance T between any two adjacent disc-shaped cutters 61 is 25.4 mm (equal to...). (value), such as Figure 7 Description.

[0083] like Figure 6 As described above, the disc cutter 61 and the sleeve rake wheel 62 are sequentially mounted on the rotating shaft 90, and the variable frequency motor 18 is installed through the keyway 94 and the coupling to drive the disc cutter 61 to rotate and cut the tobacco into slices. The rakeing and pressing of the tobacco slices are accomplished by the rake wheel arc 62-1 and the rake wheel groove 62-2 on the sleeve rake wheel 62.

[0084] like Figures 5 to 6 The bearing sleeve 91, bearing 92, rotating shaft 90 and bearing end cover 93 are installed on the movable convex dovetail groove 64.

[0085] Specifically, the dovetail groove 64 and the concave dovetail groove 69 mechanism have a dovetail angle of 55°. The dovetail groove guide rail is designed and manufactured in accordance with the machine standard JB / ZQ4241-1997. The material is HT200. The guide rail is scraped to improve its accuracy. The clamping screw 70 is designed for fastening. The dovetail groove mechanism is installed using mounting screw 65. The anvil 13 is installed using screws through the countersunk hole 66. The adjusting handwheel 67 is loosened, and the dovetail groove is precisely adjusted using the handwheel 16 to make the disc cutter 61 complete the lifting and lowering, and then it is tightened again.

[0086] like Figure 7 The cutting dimension T is 25.4mm, which is designed based on the thickness of the disc cutter 61 and the length of the sleeve rake wheel 62, and is assembled on the rotating shaft 90 in sequence.

[0087] likeFigure 8 The sleeve and rake wheel are designed as one piece. In order to achieve the rake movement and compaction of the tobacco, the arc 62-1 and the rake wheel groove 62-2 are designed to improve the slitting effect.

[0088] like Figure 9 A circular groove 63 is designed on the cutting board 13 to improve the cutting effect and facilitate the adjustment of the distance between the cutting board 13 and the disc-shaped cutter 61.

[0089] It is evident that the surfaces of the primary sieve plate 3 and the secondary sieve plate 9 are spatial curved surfaces formed orthogonally by two cosine curves. Because this spatial waveform surface has an array of alternating peaks and troughs, it represents a classic orthogonal screening method. Furthermore, the screening holes are designed along the trough lines, also exhibiting an array-like spatial alternation. Therefore, it effectively solves the problems of clumping and adhesion of tobacco materials online. Matching the simple harmonic vibration amplitude and frequency of the vibrating trough, it achieves high screening efficiency. Due to the effect of the sine wave, it also provides excellent uniform distribution of tobacco materials.

[0090] Because this technical solution uses sinusoidal basis functions in an orthogonal system to design the conveying and screening surface, according to the surface integral theory of curves, the effective area of ​​the screening surface of the conveying and screening plate is much larger than that of a flat plate with the same length and width. According to mechanical theory and the normal characteristics of the surface, this orthogonal spatial surface has high efficiency in loosening materials and low crushing characteristics.

[0091] The above are merely preferred embodiments of this utility model and are illustrative rather than restrictive. The structure and connection methods of the components in this utility model can be varied. Any equivalent transformations and improvements made based on the technical solution of this utility model should not be excluded from the protection scope of this utility model.

Claims

1. A device for classifying, orthogonally screening, and cutting large sheet tobacco in the production of medium and fine cigarettes, characterized in that, It includes an input line (1), a primary vibrating screen (2), a first discharge chute (7), a first conveyor plate (5), a first cutting unit (6), a secondary vibrating screen (8), a second discharge chute (19), a second conveyor plate (11), a second cutting unit (12), a third discharge chute (14), and a conveyor line (15); The primary vibrating screen (2) includes a primary screen plate (3), which has a first screening hole (4). The secondary vibrating screen (8) includes a secondary screen plate (9), which has a second screening hole (10). The screening surfaces of the primary screen plate (3) and the secondary screen plate (9) are spatial curved surfaces. To construct a three-dimensional spatial coordinate system in mutually perpendicular orthogonal planes, the mathematical function of the spatial curved surface of the screening surface is y = f(x,z). The equation of the first trajectory is y = 10cos(x / λ2×2π), wavelength λ2 = 62.832mm, wave height 20mm. The equation of the second trajectory is y = 10cos(z / λ1×2π), wavelength λ1 = 125.664mm, wave height 20mm. The x-direction along the first trajectory is the width direction of the screen plate, and the z-direction along the second trajectory is the length direction of the screen plate, i.e., the screening and conveying direction of the tobacco material.

2. The tobacco sheet classification, orthogonal sieving, and large-sheet tobacco cutting device adapted to the production of medium and fine cigarettes according to claim 1, characterized in that, At the trough of the cosine curve y = 10cos(x / λ² × 2π) on the first trajectory, sieve holes are made according to the cosine curve y = 10cos(z / λ₁ × 2π). Five sieve holes are evenly distributed within a wavelength λ₁ = 125.664 mm, with a diameter of [missing information]. The screening holes are manufactured according to the normal of the cosine curve y = 10cos(z / λ1×2π), that is, the screening holes on the crests and troughs are parallel to each other and perpendicular to the xoz plane. The screening holes on the wave surface are angled with the z-axis, and their normal vector is calculated by the first derivative of y = 10cos(z / λ1×2π).

3. The tobacco sheet classification, orthogonal sieving, and large-sheet tobacco cutting device adapted to the production of medium and fine cigarettes according to claim 1, characterized in that, The length of the primary sieve plate (3) is greater than or equal to the length of the secondary sieve plate (9).

4. The tobacco leaf sorting, orthogonal sieving, and large-leaf tobacco cutting device adapted to the production of medium and fine cigarettes according to claim 1, characterized in that, Both the first slitting unit (6) and the second slitting unit (12) include a handwheel (16), a dovetail groove adjustment frame (17), a variable frequency motor (18), a disc cutter (61), a sleeve rake wheel (62), and an anvil (13). The dovetail groove adjustment frame (17) includes a convex dovetail groove (64) and a concave dovetail groove (69) that match the concave and convex shapes. The handwheel (16) is used to adjust the lifting and lowering of the convex dovetail groove (64), thereby adjusting the gap of the arc groove (63) between the disc cutter (61) and the anvil (13).

5. The tobacco sheet classification, orthogonal sieving, and large-sheet tobacco cutting device adapted to the production of medium and fine cigarettes according to claim 4, characterized in that, Install the bearing sleeve (91), bearing (92), shaft (90) and bearing end cap (93) on the movable dovetail groove (64); The disc cutter (61) and the sleeve rake wheel (62) are sequentially mounted on the rotating shaft (90), and the variable frequency motor (18) is mounted through the keyway (94) and the coupling to drive the disc cutter (61) to rotate and slice the tobacco.

6. The tobacco sheet classification, orthogonal sieving, and large-sheet tobacco cutting device adapted to the production of medium and fine cigarettes according to claim 5, characterized in that, The sleeve rake wheel (62) includes a rake wheel arc (62-1) and a rake wheel groove (62-2). The rakeing and pressing of the tobacco is accomplished by the rake wheel arc (62-1) and the rake wheel groove (62-2) on the sleeve rake wheel (62).

7. The tobacco sheet classification, orthogonal sieving, and large-sheet tobacco cutting device adapted to the production of medium and fine cigarettes according to claim 6, characterized in that, The stability of the dovetail groove adjustment bracket (17) is achieved by the adjustment handwheel (67) and the clamping screw (70); The dovetail groove adjusting bracket (17) of the dovetail groove mechanism is installed using mounting screws (65); The anvil (13) is installed using screws through the countersunk hole (66).

8. The tobacco sheet classification, orthogonal screening, and large-sheet tobacco cutting device adapted to the production of medium and fine cigarettes according to claim 7, characterized in that, The gap between the circular groove (63) between the disc-shaped cutter (61) and the anvil (13) is 1-2 mm; The distance T between any two adjacent disc cutters (61) is 25.4 mm.

9. The tobacco sheet sorting, orthogonal sieving, and large-sheet tobacco cutting device adapted to the production of medium and fine cigarettes according to claim 8, characterized in that, The dovetail angle of the convex dovetail groove (64) and the concave dovetail groove (69) is 55°.

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