Digital twin motion simulation method and system of tobacco leaves in loose moistening cylinder

Abstract

The application discloses a kind of digital twin motion simulation method and system of tobacco in loose leaf moistening cylinder, the method comprises: establishing 1:1 of loose leaf moistening cylinder three-dimensional geometric simulation model, loose leaf moistening cylinder three-dimensional geometric simulation model includes: tobacco inlet, copy board, cylinder and tobacco outlet, cylinder is inclined downward from the tobacco inlet to tobacco outlet, the axis of cylinder and horizontal plane is preset inclination angle;Establish the three-dimensional geometric simulation particle model of tobacco;The motion of the three-dimensional geometric simulation particle model of initial holding amount of tobacco in loose leaf moistening cylinder three-dimensional geometric simulation model is simulated and calculated.The digital twin motion simulation method of tobacco in loose leaf moistening cylinder provided by the application obtains a large number of experimental data sets through computer simulation test, and compares and analyzes the data with actual production, so as to accurately obtain the parameter design rule and basis of loose leaf moistening cylinder, and avoid the waste of debugging before tobacco production.

Description

Technical Field

[0001] This invention relates to the field of digital twin technology, and in particular to a digital twin motion simulation method and system for tobacco leaves in a loose leaf-wetting tube. Background Technology

[0002] Loosening and moistening tobacco leaves is an indispensable and crucial processing step in the tobacco processing industry. The loosening and moistening cylinder is the main process equipment in this step. Its task is to appropriately increase the moisture content and temperature of the tobacco leaves, so that the sliced ​​tobacco leaves are loose, free of clumps, and improve the processing resistance of the tobacco leaves. The tobacco leaves enter the cylinder through the feed inlet and gradually move to the discharge outlet by means of the clockwise rotation of the rakes, lifting plates, and rollers, as well as the gravity of the tobacco leaves themselves.

[0003] Driven by the staggered lifting plates inside the cylinder, the clumps of tobacco leaves tumble forward, a process that mechanically loosens any remaining tobacco flakes. Simultaneously, the tumbling of the tobacco leaves ensures thorough contact with the atomized water and steam introduced through the dual-medium nozzles and steam spray pipes, achieving humidification and heating effects. The continuous flow of tobacco material creates a continuous processing flow, enabling steady-state operation.

[0004] The tilt angle, rotation speed, installation angle of the lifting plates inside the loose leaf-wetting cylinder, and the length of the lifting plates all affect the final leaf-wetting effect. Therefore, optimizing the various parameters of the loose leaf-wetting cylinder to achieve a better leaf-wetting effect is particularly important.

[0005] Therefore, there is an urgent need for a digital twin motion simulation method and system for tobacco leaves in a loose wetting tube. Summary of the Invention

[0006] The purpose of this invention is to provide a digital twin motion simulation method and system for tobacco leaves in a loose leaf-wetting cylinder, so as to solve the problems in the prior art, accurately obtain the parameter design rules and basis of the loose leaf-wetting cylinder, and avoid the waste of debugging before the tobacco production process.

[0007] This invention provides a digital twin motion simulation method for tobacco leaves in a loose leaf-wetting cylinder, comprising the following steps:

[0008] A 1:1 three-dimensional geometric simulation model of a loose leaf moistening cylinder is established. The three-dimensional geometric simulation model of the loose leaf moistening cylinder includes at least: a tobacco leaf inlet, a lifting plate, a cylinder body, and a tobacco leaf outlet. The cylinder body is inclined downward from the tobacco leaf inlet to the tobacco leaf outlet, and the axis of the cylinder body is inclined at a preset angle to the horizontal plane.

[0009] Establish a three-dimensional geometric simulation particle model of tobacco leaves;

[0010] The motion of the three-dimensional geometric simulation particle model of the tobacco leaves with the initial material holding amount within the three-dimensional geometric simulation model of the loose leaf-wetting cylinder is simulated and calculated.

[0011] The digital twin motion simulation method for tobacco leaves in a loose wetting cylinder, as described above, preferably includes the following: Establishing a 1:1 three-dimensional geometric simulation model of the loose wetting cylinder.

[0012] In 3D CAD software, a 1:1 three-dimensional geometric simulation model of the loose leaf moistening cylinder is established based on the key parameters of the loose leaf moistening cylinder. The 3D geometric simulation model of the loose leaf moistening cylinder includes: tobacco leaf inlet, steam application device, circulating hot air inlet, short nail, lifting plate, cylinder body, discharge hood, ventilation system and tobacco leaf discharge outlet.

[0013] The 3D geometric simulation model of the loose leaf spring cylinder, created at a 1:1 scale in 3D CAD software, is saved and imported into the discrete element method particle media simulation software.

[0014] The digital twin motion simulation method for tobacco leaves in a loose leaf-wetting cylinder, as described above, preferably includes the following: Establishing a three-dimensional geometric simulation particle model of the tobacco leaves.

[0015] A two-dimensional sheet-like geometric model is imported from an external source into the discrete element method (DEM) particle media simulation software. The shell thickness is set and the shell mesh is divided in the DEM particle media simulation software. The actual tobacco leaf is set as a flexible shell model particle to establish a three-dimensional geometric simulation particle model of the tobacco leaf.

[0016] The digital twin motion simulation method for tobacco leaves in a loose wetting cylinder, as described above, preferably includes the following: The simulation calculation of the motion of the three-dimensional geometric simulation particle model of the tobacco leaves with the initial material holding amount within the three-dimensional geometric simulation model of the loose wetting cylinder specifically includes:

[0017] For different initial material holding amounts, the relationship between the percentage of material holding amount of the three-dimensional geometric simulation particle model of the tobacco leaf on the lifting plate and the rotation angle of the lifting plate is analyzed;

[0018] For different initial material holding amounts, the relationship between the slope of the material holding percentage curve of the three-dimensional geometric simulation particle model of the tobacco leaf on the lifting plate and the rotation angle of the lifting plate is analyzed.

[0019] For different cylinder rotation speeds, the relationship between the percentage of material held in the three-dimensional geometric simulation particle model of the tobacco leaves on the lifting plate and the rotation angle of the lifting plate is analyzed.

[0020] For different lifting plate installation angles, the relationship between the percentage of material holding in the three-dimensional geometric simulation particle model of the tobacco leaf on the lifting plate and the rotation angle of the lifting plate is analyzed;

[0021] The spatial position of any of the three-dimensional geometric simulation particles of the tobacco leaf in the cylinder changes over time.

[0022] A probabilistic statistical analysis was performed on the three-dimensional geometric simulation particle model of the tobacco leaves undergoing a complete throwing motion within the cylinder.

[0023] The digital twin motion simulation method for tobacco leaves in a loose leaf-wetting cylinder, as described above, preferably further includes:

[0024] Based on the simulation calculation results of the tobacco leaves with the initial material holding in the loose leaf-wetting cylinder, the rotational speed of the cylinder and the installation angle of the lifting plate are determined.

[0025] In the digital twin motion simulation method for tobacco leaves in a loose leaf-wetting cylinder as described above, preferably, the rotational speed of the cylinder is determined to be 15 rpm; and the installation angle of the lifting plate 5 is determined to be 80°.

[0026] The digital twin motion simulation method for tobacco leaves in a loose leaf-wetting cylinder, as described above, preferably further includes:

[0027] With the cylinder rotating at 15 rpm and the lifting plate 5 installed at 80°, the inclination angle between the axis of the cylinder 6 and the horizontal line is determined based on the simulation calculation results of the tobacco leaves with the initial material holding in the loose leaf moistening cylinder.

[0028] With the cylinder rotating at 15 rpm and the lifting plate 5 installed at an angle of 80°, the angle between the axis of the cylinder 6 and the horizontal line is determined to be 3°.

[0029] The digital twin motion simulation method for tobacco leaves in a loose leaf-wetting cylinder, as described above, preferably further includes:

[0030] Visual analysis of the movement of tobacco leaves within a loose leaf-wetting tube.

[0031] This invention also provides a digital twin motion simulation method for tobacco leaves in a loose leaf-wetting tube, comprising:

[0032] The loose leaf moistening cylinder modeling module is used to establish a 1:1 three-dimensional geometric simulation model of the loose leaf moistening cylinder. The three-dimensional geometric simulation model of the loose leaf moistening cylinder includes at least: a tobacco leaf inlet, a lifting plate, a cylinder body, and a tobacco leaf outlet. The cylinder body is inclined downward from the tobacco leaf inlet to the tobacco leaf outlet, and the axis of the cylinder body is inclined at a preset angle to the horizontal plane.

[0033] The tobacco leaf modeling module is used to create a three-dimensional geometric simulation particle model of tobacco leaves.

[0034] The simulation calculation module is used to simulate and calculate the movement of the three-dimensional geometric simulation particle model of the tobacco leaves with the initial material holding amount within the three-dimensional geometric simulation model of the loose leaf-wetting cylinder.

[0035] The present invention relates to a digital twin motion simulation method and system for tobacco leaves in a loose leaf-lubricating cylinder. Through computer simulation testing, a large amount of experimental data is obtained, which is compared and analyzed with actual production data. This provides a basis for the design of the loose leaf-lubricating cylinder and the angle of the lifting plate installation, allowing for the adjustment of the cylinder's process and geometric parameters. This reduces waste during pre-production tobacco leaf adjustments, facilitates the rapid construction of a 3D simulation model for parameter adjustment, and makes the falling action of tobacco leaves on the lifting plate more accurate. This optimizes the loose leaf-lubricating cylinder parameters, improves the quality and processing resistance of the tobacco leaves, and provides guidance for the loose leaf-lubricating process in cigarette manufacturing. It effectively solves the difficulty of fitting discrete particles using continuous equations, obtaining a general description of particle flow behavior through simulation of each particle. Compared to direct laboratory experiments, computer simulation effectively avoids a series of problems such as errors caused by environmental influences, energy consumption, and difficulties in observing instantaneous conditions. Attached Figure Description

[0036] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described below with reference to the accompanying drawings, wherein:

[0037] Figure 1 A flowchart illustrating an embodiment of the digital twin motion simulation method for tobacco leaves in a loose leaf-wetting cylinder provided by the present invention;

[0038] Figure 2 A schematic diagram of the three-dimensional geometric simulation model of the loose wetting tube provided by the present invention;

[0039] Figure 3 A schematic diagram of the three-dimensional geometric simulation particle model of tobacco leaves provided by the present invention;

[0040] Figure 4 This is a graph showing the relationship between the percentage of tobacco leaf holding capacity and the rotation angle in Example 1.

[0041] Figure 5 This is a graph showing the relationship between the slope of the percentage curve of tobacco leaf holding capacity on the lifting plate and the rotation angle in Example 1.

[0042] Figure 6 This is a graph showing the relationship between the percentage of tobacco leaf holding capacity and the rotation angle (at different drum rotation speeds) in Example 2.

[0043] Figure 7 This is a diagram showing the state of tobacco particles at a cylinder rotation speed of 10 rpm and a rotation angle of 90° in Example 2.

[0044] Figure 8 This is a diagram showing the state of tobacco particles at a cylinder rotation speed of 10 rpm and a rotation angle of 108° in Example 2.

[0045] Figure 9 This is a diagram showing the state of tobacco particles at a cylinder rotation speed of 10 rpm and a rotation angle of 162° in Example 2.

[0046] Figure 10 This is a diagram showing the state of tobacco particles at a cylinder rotation speed of 15 rpm and a rotation angle of 90° in Example 2.

[0047] Figure 11 This is a diagram showing the state of tobacco particles at a cylinder rotation speed of 15 rpm and a rotation angle of 108° in Example 2.

[0048] Figure 12 This is a diagram showing the state of tobacco particles at a cylinder rotation speed of 15 rpm and a rotation angle of 162° in Example 2.

[0049] Figure 13 This is a diagram showing the installation angles of different mounting plates in Example 3;

[0050] Figure 14 This is a graph showing the relationship between the percentage of tobacco leaf holding capacity and the rotation angle in Example 3;

[0051] Figure 15 This is a diagram showing the state of tobacco particles when the mounting angle of the scraper plate is 80° and the rotation angle is 108° in Example 3.

[0052] Figure 16 This is a diagram showing the state of tobacco particles under the conditions of the scraper plate installation angle of 80° and rotation angle of 126° in Example 3.

[0053] Figure 17 This is a diagram showing the state of tobacco particles when the scraper plate is installed at an angle of 80° and rotated at an angle of 144° in Example 3.

[0054] Figure 18 This is a diagram showing the state of tobacco particles when the mounting angle of the scraper plate is 80° and the rotation angle is 162° in Example 3.

[0055] Figure 19 This is a diagram showing the horizontal and vertical distribution of tobacco leaves within the loose leaf-wetting tube in Example 4;

[0056] Figure 20 This is a percentage distribution diagram of tobacco leaves being sprinkled at different locations in Example 4;

[0057] Figure 21 This is a graph showing the relationship between the percentage of tobacco leaf holding capacity and the cylinder inclination angle in Example 5;

[0058] Figure 22This is a structural block diagram of an embodiment of the digital twin motion simulation system for tobacco leaves in a loose leaf-wetting cylinder provided by the present invention.

[0059] Explanation of reference numerals in the attached drawings: 1-Tobacco leaf inlet, 2-Steam application device, 3-Circulating hot air inlet, 4-Short nail, 5-Lifting plate, 6-Cylinder, 7-Discharge hood, 8-Ventilation system, 9-Tobacco leaf discharge outlet. Detailed Implementation

[0060] Various exemplary embodiments of the present disclosure will now be described in detail with reference to the accompanying drawings. The descriptions of the exemplary embodiments are merely illustrative and are in no way intended to limit the present disclosure or its application or use. The present disclosure may be implemented in many different forms and is not limited to the embodiments described herein. These embodiments are provided so that the present disclosure will be thorough and complete, and will fully express the scope of the disclosure to those skilled in the art. It should be noted that, unless specifically stated otherwise, the relative arrangement of components and steps, the composition of materials, numerical expressions, and values ​​set forth in these embodiments should be interpreted as exemplary only and not as limiting.

[0061] The terms “first,” “second,” and similar terms used in this disclosure do not indicate any order, quantity, or importance, but are merely used to distinguish different parts. Terms such as “including” or “contains” mean that the element preceding the term encompasses the element listed after it, and do not exclude the possibility of encompassing other elements as well. Terms such as “above” and “below” are used only to indicate relative positional relationships; when the absolute position of the described object changes, this relative positional relationship may also change accordingly.

[0062] In this disclosure, when a specific component is described as being located between a first component and a second component, an intermediary component may or may not be present between the specific component and the first or second component. When a specific component is described as connecting to other components, the specific component may be directly connected to the other components without having an intermediary component, or it may not be directly connected to the other components but may have an intermediary component.

[0063] All terms used in this disclosure (including technical or scientific terms) have the same meaning as understood by one of ordinary skill in the art to which this disclosure pertains, unless otherwise specifically defined. It should also be understood that terms defined in a general dictionary, such as a dictionary, should be interpreted as having a meaning consistent with their meaning in the context of the relevant art, and not as having an idealized or highly formalized meaning, unless expressly defined herein.

[0064] Techniques, methods, and equipment known to those skilled in the art may not be discussed in detail, but where appropriate, they should be considered part of the specification.

[0065] like Figure 1 As shown, the digital twin motion simulation method for tobacco leaves in a loose wetting cylinder provided in this embodiment includes the following steps in actual execution:

[0066] Step S1: Establish a 1:1 three-dimensional geometric simulation model of the loose leaf-wetting cylinder 100 (e.g., Figure 2 As shown), the three-dimensional geometric simulation model of the loose leaf moistening cylinder 100 includes at least: a tobacco leaf inlet 1, a lifting plate 5, a cylinder body 6 and a tobacco leaf outlet 9. The cylinder body 6 is inclined downward from the tobacco leaf inlet 1 to the tobacco leaf outlet 9, and the axis of the cylinder body 6 is inclined at a preset angle to the horizontal plane.

[0067] The preset tilt angle is, for example, 3°-5°. It should be noted that this invention does not specifically limit the range of the preset tilt angle. Figure 2 As shown, in one embodiment of the digital twin motion simulation method for tobacco leaves in a loose leaf-wetting cylinder of the present invention, step S1 may specifically include:

[0068] Step S11: Establish a 1:1 three-dimensional geometric simulation model of the loose leaf moistening cylinder 100 in the three-dimensional CAD software. The three-dimensional geometric simulation model of the loose leaf moistening cylinder 100 includes: tobacco leaf inlet 1, steam application device 2, circulating hot air inlet 3, short nail 4, lifting plate 5, cylinder body 6, discharge hood 7, ventilation system 8 and tobacco leaf discharge outlet 9.

[0069] During operation, tobacco leaves 200 enter the cylinder 6 through the tobacco leaf inlet 1, relying on the rake nails 4 (composed of short nails 4), the lifting plates 5, and the clockwise rotation of the cylinder 6 (from... Figure 2 The tobacco leaves 200 move gradually to the tobacco leaf outlet 9 under the influence of the direction of the tobacco leaf inlet 1 and the gravity of the tobacco leaves themselves. The tobacco leaves 200 are tumbled up and down by the lifting plates 5 staggered inside the cylinder 6, making full contact with the steam introduced through the circulating hot air inlet 3 and the atomized water introduced through the steam application device 2, achieving the effect of humidification and heating. In one specific embodiment of the present invention, the key parameters of the loose leaf moistening cylinder 100 can be set with reference to Table 1. It should be noted that the present invention does not specifically limit the setting of the key parameters of the loose leaf moistening cylinder 100.

[0070] Table 1 Key parameters of loose leaf-wetting cylinder

[0071]

[0072]

[0073] Step S12: Save the 3D geometric simulation model of the loose leaf spring cylinder, which is created at a 1:1 scale in the 3D CAD software, and import it into the discrete element method particle media simulation software.

[0074] After establishing a 1:1 three-dimensional geometric simulation model of the loose leaf-wetting cylinder 100 in the 3D CAD software based on the key parameters of the leaf-wetting cylinder, the model is saved and imported into the discrete element method particle media simulation software, thus completing the creation of the loose leaf-wetting cylinder simulation model.

[0075] Step S2: Establish a three-dimensional geometric simulation particle model of tobacco leaf 200.

[0076] Specifically, such as Figure 3 As shown, a two-dimensional sheet-like geometric model is imported from an external source into the discrete element method particle media simulation software. The shell thickness is set and the shell mesh is divided in the discrete element method particle media simulation software. The actual tobacco leaf is set as a flexible shell model particle to establish a three-dimensional geometric simulation particle model of the tobacco leaf.

[0077] Tobacco leaves vary in shape, thickness, and size. In the implementation, 100 tobacco leaves were randomly selected and their sizes were measured. The shapes were mainly categorized as rectangular, round, triangular, and irregular. To simplify the model, this invention uses the most common rectangular tobacco leaves for calculation, significantly reducing computation time while maintaining the same simulation effect as reality. When setting up sheet-like tobacco leaf particles using a shell particle model, the average size of the tobacco leaves was taken as: length 90mm, width 40mm, and thickness 3mm. The average size of the tobacco leaves is the average of the dimensions of all rectangular tobacco leaves. In the implementation, the actual three-dimensional dimensions of all rectangular tobacco leaves were measured, and the average length, width, and thickness of each rectangular tobacco leaf were calculated. Figure 3 As shown.

[0078] By meshing the shell particles, simulation calculations of flexible bodies can be achieved, significantly reducing the computational requirements. The geometry of the shell particles is generated by defining a two-dimensional surface mesh with a specific thickness (i.e., 3 mm), such as... Figure 3 As shown, each rectangular particle constituting the flexible shell is connected by 20 spherical triangles. The linear and angular deformations of these connected spherical triangles simulate the flexible curling characteristics of actual tobacco leaves. Here, a spherical triangle is a triangular prism, and each side of the prism is composed of rounded edges with a radius equal to half the thickness of the prism. The thinner the tobacco leaf, the longer the simulation time and the higher the GPU requirements. To save memory and runtime, this invention simplifies the process to a 3mm thick tobacco leaf, without affecting the actual tobacco leaf's trajectory and dwell time. Therefore, the shell thickness is set to 3mm.

[0079] In one specific implementation, the key parameters of the tobacco leaves can be set with reference to Table 2.

[0080] Table 2 Parameters of Tobacco Particle Model

[0081] Parameter Items Parameter design values Particle density <![CDATA[223kg / m 3 ]]> Particle Poisson's ratio 0.4 Particle Young's modulus <![CDATA[3.75×10 6 so]]> Particle length 90mm Particle width 40mm Particle thickness 3mm interparticle elastic recovery coefficient 0.45 static friction coefficient between particles 0.5 coefficient of kinetic friction between particles 0.2 interparticle adhesion distance 6.25mm interparticle adhesion fraction 0.1 Elastic recovery coefficient between particles and the wall of the humidifier tube 0.45 The static friction coefficient between particles and the wall of the humidifier tube 0.5 The coefficient of dynamic friction between particles and the wall of the humidifier tube 0.5

[0082] Step S3: Simulate the motion of the three-dimensional geometric simulation particle model of the tobacco leaves 200 with the initial material holding amount within the three-dimensional geometric simulation model of the loose leaf-wetting cylinder 100.

[0083] In step S3, the motion of a large number of three-dimensional geometric simulation particle models 200 of tobacco leaves 200 established in step S2 within the three-dimensional geometric simulation model 100 of loose leaf-moistening tube established in step S1 is simulated and calculated.

[0084] like Figure 2 As shown, after the tobacco leaves 200 enter the loosening and moistening cylinder 100 from the tobacco leaf inlet 1, they are first loosened by the rake nails composed of short nails 4, and then picked up by the lifting plates 5 and continuously rolled forward along the cylinder 6 with a central axis that has a preset angle of inclination to the horizontal plane, and finally discharged from the tobacco leaf outlet 9. Therefore, during the movement of the tobacco leaves 200, it is necessary to analyze the lifting and falling effect of the lifting plates 5 on the tobacco leaves 200 in the loosening and moistening cylinder 100, as well as the influence of the inclination angle and rotation speed of the cylinder 6, the length and installation angle of the lifting plates 5 on the overall moistening effect, in order to simulate the trajectory of the tobacco leaves 200 under the action of the lifting plates 5, which first produces a semi-circular lifting motion and then a parabolic throwing motion. Ideally, the more tobacco leaves 200 are held on the high-positioned lifting plate 5, the higher the throwing height, and the more fully the tobacco leaves 200 come into contact with the hot airflow entering from the circulating hot air inlet 3. This makes it easier for heat and mass transfer to occur, thereby enhancing the uniformity of wetting, flexibility, and processing resistance of the tobacco leaves 200.

[0085] The Discrete Element Method (DEM) simplifies the three-dimensional geometric simulation particle model of loose tobacco leaves (200g) into a set with certain shapes and masses. This allows for a series of discrete, independent unit motions of the particle material model, thereby establishing a discrete mathematical model containing particle motion information. By integrating the translational motion, rotational motion, and contact forces within the particle system for each particle, it is possible to individually track the motion of each particle with a mass of m. p The change in the free velocity of particle i during continuous collisions is shown in Equations (1) and (2):

[0086]

[0087]

[0088] In formulas (1) and (2), m i x represents the equivalent mass of particle i; i Φ represents the spatial position of particle i. iIndicates the spatial orientation of particle i; M represents the contact force exerted by particle j or the loose wetting tube wall on particle i. ij These represent the torques exerted by particle j or the loose wetting tube wall on particle i, respectively; f i g F represents the weight of particle i itself. i f This represents the fluid-particle interaction force on particle i; I represents the non-contact force term exerted on particle i by particle k or other sources; i Let i represent the moment of inertia of particle i.

[0089] Generally, the contact between two particles is not at a single point, but over a specific area, which results in a slight overlap between the particles in the normal coordinate n and the tangential coordinate t. Therefore, the total contact force acting on the particles at the contact surface can be analyzed in coordinates and mathematically calculated according to formula (3):

[0090]

[0091] in, This represents the normal contact force between particle j or the loose wetting tube wall and particle i. This represents the tangential contact force between particle j or the loose wetting tube wall and particle i. For example... Figures 15 to 18 As shown, in the discrete element method for granular media simulation, there are contact force vectors with overlap and torque.

[0092] This invention employs a constant adhesion force model to simulate the motion of tobacco leaf 200. This model is used to simulate the behavior of adherent particles that do not exhibit stress consolidation effects. In one embodiment of this invention, the constant adhesion force model is a liquid bridge model. This model includes two parameters: the minimum distance between particles or between a particle and the wall of a loose leaf-wetting tube, and a force fraction representing the particle's weight. The force fraction refers to the proportionality of the adhesion force on the first tobacco leaf particle to the weight of the second tobacco leaf particle. When particles come into contact, the attraction between them is proportional to the particle's weight; that is, a force fraction of 1 means the adhesion force equals the particle's weight. In the case of two particles of different masses in contact, the smaller particle mass is considered when calculating the gravity, as shown in formulas (4) and (5).

[0093] like but

[0094] like but

[0095] In formulas (4) and (5), Indicates the normal contact adhesion force; This indicates normal contact overlap; m1 and m2 represent the weights of the two contacting particles; g represents the gravitational acceleration of the particle; δ adh This indicates the adhesion distance between particles or between particles and the loose wall of the wetting cylinder; f adh Represents a force fraction.

[0096] In one embodiment of the digital twin motion simulation method for tobacco leaves in a loose leaf-wetting cylinder of the present invention, step S3 may specifically include:

[0097] Step S31: For different initial material holding amounts, analyze the relationship between the percentage of material holding amount of the three-dimensional geometric simulation particle model of the tobacco leaf 200 on the lifting plate 5 and the rotation angle of the lifting plate.

[0098] In one embodiment of the present invention, the influence of the lifting plate 5 on the falling motion of the tobacco leaf 200 during the rotation cycle is analyzed. For example... Figure 2 As shown, the lifting plate 5 is an important component of the loosening and moistening cylinder 100, which is responsible for lifting the tobacco leaves 200 as material and evenly scattering them to the bottom of the cylinder 6. The lifting plate 5 scatters the tobacco leaves 200 into the hot steam, so that the tobacco leaves 200 and the hot steam can fully contact each other, enhance heat and mass exchange, and promote the moistening effect of the loosening and moistening cylinder 100.

[0099] Specifically, in the discrete element method particle media simulation software, tobacco leaves 200 are randomly and evenly distributed onto the first target picker plate 5. Starting from 0° at the bottom of the cylinder 6, the number of tobacco leaves 200 as load is recorded every 18° rotation of the picker plate 5 until the picker plate 5 rotates to 180° at the top of the cylinder 6.

[0100] Figure 4 The diagram shows the percentage of tobacco leaf holding capacity on a specific lifting plate 5 for different initial tobacco leaf holding capacities (455, 620, 784, 826, 922, and 1013 pieces, respectively) (at this time, the inclination angle of the loose leaf moistening cylinder is 3°, and the drum speed is 10 rpm). Figure 4 The overall trend shows that the lifting plate 5 of the loose leaf moistening cylinder 100 has a lifting effect on the tobacco leaves 200. As the lifting plate 5 rotates and rises, the amount of tobacco leaves it carries gradually decreases.

[0101] The process is divided into two stages: the first stage is between 0° and 90°, indicating that most of the tobacco leaves 200 are lifted and raised on the lifting plate 5; however, due to the squeezing and collision between the tobacco leaves 200 and the gravity of the particles themselves, a small portion of the tobacco leaves 200 at the edge of the lifting plate 5 will fall off the lifting plate, resulting in a slightly flatter downward curve; the second stage is between 90° and 162°, indicating that as the lifting plate 5 rotates and rises, the angle between the lifting plate 5 and the axis of the cylinder 6 increases, and it loses its bearing capacity for the tobacco leaves 200. After the tobacco leaves 200 are scattered off the lifting plate, the material holding capacity decreases from 80% at the 90° position to all of them being scattered at the 162° position.

[0102] Step S32: For different initial material holding amounts, analyze the relationship between the slope of the material holding percentage curve of the three-dimensional geometric simulation particle model of the tobacco leaf 200 on the lifting plate 5 and the rotation angle of the lifting plate.

[0103] Figure 5 The simulation results show the percentage decrease rate of tobacco leaf holding capacity of the lifting plate 5 under different initial tobacco leaf holding capacities (455, 620, 784, 826, 922, and 1013 pieces) (at which time the leaf-moistening cylinder tilt angle is 3° and the drum speed is 10 rpm). Figure 4 Find the first derivative of the curve shown, and calculate the slope of the curve at these points to obtain... Figure 5 The curve shown. Figure 5 The results show that as the total number of particles increases, the curves gradually converge, with the curves being very close when the initial tobacco leaf holding capacity is 922 and 1013. Therefore, to ensure equivalence with actual operation, the experimental initial tobacco leaf holding capacity for the dispersion effect of the single plate of the lifting plate 5 on the tobacco leaves can be determined to be 922 particles.

[0104] Step S33: For different cylinder rotation speeds, analyze the relationship between the percentage of material holding in the three-dimensional geometric simulation particle model of the tobacco leaf 200 on the lifting plate 5 and the rotation angle of the lifting plate.

[0105] In some embodiments of the present invention, the influence of the rotational speed of the loose leaf-moistening tube 100 on the falling motion of the tobacco leaves 200 is analyzed. Figure 6 The diagram shows the percentage of tobacco leaf holding on the lifting plate at different rotation angles (5 rpm, 10 rpm, 15 rpm and 20 rpm) under different cylinder rotation speeds (at this time, the tilt angle of the loose leaf-moistening cylinder is 3°). Under the same conditions, the lifting of tobacco leaf 200 by the lifting plate 5 in the first stage is slightly different. The lifting plate 5 holds about 75% of the tobacco leaf 200 particles and the difference in quantity is not obvious. The lifting plate in the second stage has a greater impact on the lifting of tobacco leaves.

[0106] Figures 7-12 The diagram shows a comparison of the motion of the tobacco leaf 200 particle model when the scraper rotates to 90°–162° at speeds of 10 rpm and 15 rpm. Figure 7 The cylinder rotates at 10 rpm, and the rotating angle of the lifting plate 5 is 90°. Figure 8 The cylinder rotates at 10 rpm, and the rotating angle of the lifting plate 5 is 108°. Figure 9 The cylinder rotates at 10 rpm, and the rotating angle of the lifting plate 5 is 162°. Figure 10 The cylinder rotates at 15 rpm, and the rotating angle of the lifting plate 5 is 90°. Figure 11 The cylinder rotates at 15 rpm, and the rotating angle of the lifting plate 5 is 108°. Figure 12 The cylinder rotates at 15 rpm, and the rotating angle of the lifting plate 5 is 162°.

[0107] Depend on Figures 7-12 It can be seen that when the rotation speed of the cylinder 6 is too low, firstly, when the particle model of the flaky tobacco leaf 200 is at a high position, the material held by the lifting plate 5 is too small, causing it to detach from the lifting plate 5 too early and undergo a small-amplitude parabolic motion. It can be confirmed that, since the steam application device 2 of the loose leaf moistening cylinder 100 is installed on the central axis of the loose leaf moistening cylinder 100, the particles that fall at this time have already fallen to the bottom of the cylinder 6 before contacting the atomized water, and cannot be thrown to the high-temperature zone with the rotation of the cylinder 6, thus affecting the leaf moistening effect;

[0108] Secondly, the granular tobacco leaf 200 particles accumulate at the bottom of the cylinder 6, increasing the entanglement and adhesion between the particles 200, resulting in poor permeability and flowability of the particles 200, thus affecting production efficiency. This is clearly caused by excessively slow rotation speed. Therefore, it is necessary to increase the rotation speed so that the lifting plate 5 can apply an upward thrust to the granular tobacco leaf 200 particles, allowing them to fall at a better angle. This ensures that more granular tobacco leaf 200 particles can contact the atomized water along a parabolic trajectory passing through the central axis of the loose leaf-moistening cylinder 100 before falling to the bottom of the cylinder 6. Conversely, when the rotation speed of the cylinder 6 is too high, some of the tobacco leaf 200 particles will stick tightly to the cylinder wall, causing the centrifugal force on the tobacco leaf 200 particles to be greater than their own weight. As a result, even after the lifting plate 5 rotates to 162°, it still cannot completely spread the tobacco leaves, resulting in poor leaf moistening effect. At the same time, due to the excessive momentum provided by the cylinder 6, the inter-particle forces of the tobacco leaf 200 particles are too large, which may cause the tobacco leaves to break and thus affect subsequent processing.

[0109] Depend on Figure 6It can be seen that at rotational speeds of 10 rpm and 15 rpm, approximately 75% of the tobacco leaf particles can be scooped up, and all of them fall between 90° and 162° of rotation. This indicates that the movement of the tobacco leaf particles within the cylinder 6 is beneficial for wetting the tobacco leaves. Figure 7 As shown in the diagram, the falling motion of the tobacco leaf 200 particle model reveals that at a cylinder rotation speed of 10 rpm, the tobacco leaf 200 begins to fall when the lifting plate rotates to 90°. From the trajectory of the tobacco leaf 200, it is clear that a large number of particles 200 fall at this point and cannot pass through the central axis of the loosening and wetting cylinder 100, which is detrimental to the wetting of the tobacco leaf. Figure 7 and Figure 11 A comparison (with the cylinder rotating at 15 rpm) reveals that the particle size of tobacco leaf 200 begins to fall when the lifting plate rotates to 108° (rotation 5), and the falling tobacco leaf 200 generally passes through the central axis of the loosening and moistening cylinder 100. Furthermore, when the loosening and moistening cylinder 100 rotates at 15 rpm, the lifting plate picks up a greater amount of tobacco leaf during the rotation from 90° to 162° (rotation 6), further demonstrating its superior moistening effect.

[0110] Based on the above analysis, it can be seen that when the rotation speed of the cylinder 6 is 15 rpm, the lifting plate 5 in the second stage lifts up the most material and has the best leaf lubrication effect.

[0111] Step S34: For different lifting plate installation angles, analyze the relationship between the percentage of material holding in the three-dimensional geometric simulation particle model of the tobacco leaf on the lifting plate and the rotation angle of the lifting plate.

[0112] In one embodiment of the present invention, the influence of the installation angle of the lifting plate 5 on the falling motion of the tobacco leaf 200 is analyzed. For example... Figure 13 As shown, the lifting plate 5 can have different installation angles, that is, the angle between the plane of the lifting plate 5 and the tangent of the cylinder 6 can vary. Figure 13 (a) illustrates a specific implementation where the mounting angle of the reverse board is 90°. Figure 13 (b) illustrates another specific embodiment with the reverse board installed at an angle of 80°. Figure 13 (c) shows another specific embodiment with the reverse board installed at a 45° angle.

[0113] like Figure 14 The relationship between the amount of tobacco leaf particles held on the lifting plate 5 in the loose leaf moistening cylinder 100 at different lifting plate installation angles (90°, 80°, 70°, 55°, and 45°) and the rotation angle is shown. Figure 14The analysis of the material holding capacity of a certain lifting plate 5 at different rotation angles with different installation angles of tobacco leaves 200 (at which time the tilt angle of the loosening and wetting cylinder is 3° and the rotation speed of the cylinder is 10 rpm) shows that the installation angle of the lifting plate 5 has a significant impact on the particle movement state. The most obvious effect is that the timing of the tobacco leaves 200 falling off is delayed as the installation angle of the lifting plate 5 decreases. For example, when the lifting plate angle decreases to 55° or 45°, some tobacco leaves 200 particles remain on the lifting plate 5 without falling off until the cylinder 6 rotates to more than 180°. These tobacco leaves 200 particles are almost difficult to wet. Therefore, it can be inferred that the installation angle of the lifting plate 5 should be greater than 45° and should not be too small, otherwise it will not be conducive to the wetting of the tobacco leaves. When the lifting plate 5 is installed at 90°, as discussed in the calculation process of step S33, a large amount of tobacco leaf 200 particles fall when the cylinder 6 rotates to 126°. However, at this time, the falling tobacco leaf 200 particles cannot pass through the central axis of the loose leaf-wetting cylinder 100, resulting in poor contact with the atomized water. Therefore, it is necessary to reduce the installation angle of the lifting plate 5 to prolong the residence time of the tobacco leaf 200 particles on the lifting plate 5. Further comparison Figure 14 The two curves showing the installation angles of the lifting plate 5 at 70° and 80° respectively indicate that during the 0°-90° rotation of the cylinder 6, the lifting plate 5 installed at a 70° angle only retains about 70% of the tobacco leaf 200 particles. Simultaneously, during the scattering stage, although all the tobacco leaf 200 particles fall between 90° and 180° of cylinder 6 rotation, the amount of material held by the lifting plate 5 decreases rapidly at angles of 90° and 108°, indicating that the excessively small installation angle of the lifting plate 5 at this stage cannot hold more tobacco leaf 200. Therefore, installing the lifting plate 5 at a 70° angle does not achieve the ideal leaf moistening effect. In contrast, the lifting plate 5 installed at an 80° angle retains more tobacco leaf 200 particles at the beginning of rotation, with only a few particles slipping off during the first half of the circular rotation. Figures 15 to 18 This illustrates the process of tobacco leaves 200 falling within the loose leaf-wetting cylinder 100 when the lifting plate is installed at an angle of 80°. Figure 15 The rotation angle of the middle cylinder is 108°. Figure 16 The rotation angle of the middle cylinder is 126°. Figure 17 The rotation angle of the middle cylinder is 144°. Figure 18 The rotation angle of the middle cylinder is 162°. Specifically, as follows: Figure 15 As shown, a large-scale spill occurred when the scraper plate 5 rotated to 108°; as Figure 16 As shown, when the scraper plate 5 rotates to 126°, the remaining tobacco leaves 200 particles also fall off; as Figure 17 As shown, the lifting plate 5 is mostly in the process of falling when it rotates to 144°; as Figure 18As shown, when the lifting plate 5 rotates to 162°, it falls to the bottom of the cylinder 6. The parabola formed at this time can pass well through the central axis of the loose leaf-lubricating cylinder 100.

[0114] Based on the above analysis, it can be concluded that the lifting plate 5 installed at an 80° angle is more conducive to lifting the tobacco leaves and achieving a better leaf moistening effect.

[0115] Step S35: Analyze the change in the spatial position of any of the three-dimensional geometric simulation particle models of the tobacco leaves in the cylinder over time.

[0116] In one embodiment of the present invention, the influence of the axial movement of the cylinder 6 on the falling motion of the tobacco leaves is analyzed. Figure 19 The diagram shows the lateral and longitudinal positions of the picked-up tobacco leaves 200 within the loosening and moistening cylinder 100. Position tracking is performed on one tobacco leaf 200 particle. The horizontal axis represents the movement time (s) of the 200 particle, the crest curve (left vertical axis) represents the longitudinal distance of the tobacco leaf 200 particle from the bottom cross-section of the cylinder 6, and the diagonal curve (right vertical axis) represents the lateral distance (x-axis) of the tobacco leaf 200 particle from the inlet surface. In practice, the number of tobacco leaves 200 within the loosening and moistening cylinder 100 is relatively large, and their internal random movement is quite complex. To better analyze the movement process of the tobacco leaves within each lifting plate 5 in the cylinder 6, points A, B, and C, which the tobacco leaf 200 particle passes through during its movement, are selected to represent a typical situation where the tobacco leaf 200 particle is scattered by the lifting plate 5.

[0117] Point A indicates that the tobacco leaf particles 200 are falling at a low position. When the contact area between the lifting plate 5 and the tobacco leaf particles is small, and the weight of the tobacco leaf particles exceeds the supporting force of the lifting plate 5, the adhesive force between the tobacco leaf particles, and the sliding friction between the tobacco leaf particles and the cylinder 6, a small number of tobacco leaf particles are prone to slipping off the edge. Point B represents the tobacco leaf particles being thrown at a high position, achieving a complete throwing motion of first a semi-circular lifting motion and then a parabolic motion. Point C indicates that the tobacco leaf particles 200 remain at the same position in the longitudinal direction.

[0118] Step S36: Perform probabilistic statistical analysis on the three-dimensional geometric simulation particle model of the tobacco leaves undergoing complete throwing motion in the cylinder.

[0119] In passing Figure 19 After analyzing the overall trajectory of a single particle 200, further... Figure 20 The percentage of tobacco leaves being sprayed at different locations was statistically analyzed. High-level spraying, represented by point B, was dominant, accounting for approximately 85.8% of all spraying points. This indicates that the lifting plate structure of the loose leaf-wetting cylinder 100 is rationally designed, enabling thorough spraying and mixing of the tobacco leaves to achieve the desired wetting effect.

[0120] It should be noted that the present invention does not specifically limit the execution order of steps S31-S36. In some embodiments of the present invention, one or more steps of steps S31-S36 may be executed, and the present invention does not specifically limit this.

[0121] In some embodiments of the present invention, the digital twin motion simulation method further includes:

[0122] Step S4: Based on the simulation calculation results of the tobacco leaves with the initial material holding amount in the loose leaf moistening cylinder, determine the rotational speed of the cylinder and the installation angle of the lifting plate.

[0123] Analysis of steps S31-S34 above shows that, for the cases that satisfy the key parameters of the loose leaf moistening cylinder in Table 1 and the parameters of the tobacco particle model in Table 2: when the rotation speed of the cylinder 1 of the loose leaf moistening cylinder 100 is 15 rpm, the throwing point of the lifting plate 5 on the tobacco leaf 200 is delayed to 108°, and the tobacco leaf 200 holds the most material at the high position, achieving the ideal motion state. Therefore, the optimal rotation speed of the cylinder 1 can be determined to be 15 rpm.

[0124] As the installation angle of the lifting plate 5 decreases, the scattering time of the tobacco leaves 200 is delayed. When the installation angle of the lifting plate 5 is 80°, the amount of tobacco leaves 200 held in the second stage (90°-162°) is the largest, and the moistening effect is the best. Therefore, the optimal installation angle of the lifting plate 5 in the moistening cylinder 100 is determined to be 80°. Thus, the determined cylinder rotation speed is 15 rpm; and the determined installation angle of the lifting plate 5 is 80°.

[0125] In some embodiments of the present invention, the digital twin motion simulation method further includes:

[0126] Step S5: When the rotational speed of the cylinder is 15 rpm and the installation angle of the lifting plate 5 is 80°, the inclination angle between the axis of the cylinder 6 and the horizontal line is determined based on the simulation calculation results of the initial material holding amount of tobacco leaves in the loose leaf moistening cylinder.

[0127] In one embodiment of the present invention, the influence of the inclination angle between the axis of the cylinder 6 and the horizontal line on the falling motion of the tobacco leaves is analyzed. Figure 21The diagram shows the percentage of tobacco leaves 200 held at different times and drum inclination angles on the same lifting plate when the cylinder rotation speed is 15 rpm and the installation angle of the lifting plate 5 is 80°. As the drum inclination angle increases, the percentage of tobacco leaves held by the lifting plate decreases in the first stage (0°–90°). When the drum inclination angle is 0°, the tobacco leaves do not have a gravitational velocity component at the outlet of the loosening and moistening cylinder, and the amount of tobacco leaves sliding off the lifting plate edge on the material inlet side increases. When the drum inclination angle is 5°, the tobacco leaves have a larger gravitational velocity component along the outlet of the loosening and moistening cylinder, and the amount of tobacco leaves sliding off the lifting plate edge on the material outlet side increases. It can be determined that when the cylinder rotation speed is 15 rpm and the installation angle of the lifting plate 5 is 80°, the amount of tobacco leaves lifted by the lifting plate is the largest when the inclination angle between the axis of the cylinder 6 and the horizontal line is 3°. That is, when the cylinder rotation speed is 15 rpm and the installation angle of the lifting plate 5 is 80°, the determined inclination angle between the axis of the cylinder 6 and the horizontal line is 3°.

[0128] In some embodiments of the present invention, the digital twin motion simulation method further includes:

[0129] Step S6: The movement of tobacco leaves 200 within the loose leaf-wetting cylinder 100 is visualized and analyzed using discrete element method (DEM) particle media simulation software. Figures 7-18 .

[0130] Visual analysis allows for an intuitive analysis of the falling action of the lifting plates in loose leaf moistening cylinders, as well as the influence of cylinder rotation speed and lifting plate installation angle on the moistening effect. It simulates the first semi-circular and then parabolic throwing motion of tobacco leaves on the lifting plates, enabling tobacco companies to easily and quickly build 3D simulation models. This helps determine the design and installation parameters of loose leaf moistening cylinders, reduces product waste during tobacco production, and facilitates the rapid determination of optimal operating parameters related to loose leaf moistening cylinders.

[0131] The digital twin motion simulation method for tobacco leaves in a loose leaf-humidifying cylinder provided in this invention obtains a large amount of experimental data through computer simulation testing. This data is then compared and analyzed with actual production data, providing a basis for the design of the loose leaf-humidifying cylinder and the angle of the lifting plates. The method allows for the adjustment of the process and geometric parameters of the loose leaf-humidifying cylinder, reducing waste during tobacco production. It facilitates the rapid and convenient construction of a three-dimensional simulation model for parameter adjustment, resulting in more accurate depiction of the falling action of tobacco leaves on the lifting plates. This optimizes the parameters of the hot air leaf-humidifying cylinder, improving the quality and processing resistance of the tobacco leaves, and providing guidance for the loose leaf-humidifying process in cigarette manufacturing. It effectively solves the difficulty of fitting discrete particles using continuous equations, obtaining a general description of particle flow behavior through simulation of each particle. Compared to direct laboratory experiments, computer simulation effectively avoids a series of problems such as errors caused by environmental influences, energy consumption, and difficulties in observing instantaneous conditions.

[0132] Accordingly, such as Figure 22 As shown, the present invention also provides a digital twin motion simulation method for tobacco leaves in a loose wetting tube, comprising:

[0133] The loose leaf moistening cylinder modeling module 101 is used to establish a 1:1 three-dimensional geometric simulation model of the loose leaf moistening cylinder. The three-dimensional geometric simulation model of the loose leaf moistening cylinder includes at least: a tobacco leaf inlet, a lifting plate, a cylinder body, and a tobacco leaf outlet. The cylinder body is inclined downward from the tobacco leaf inlet to the tobacco leaf outlet, and the axis of the cylinder body is inclined at a preset angle to the horizontal plane.

[0134] Tobacco leaf modeling module 102 is used to create a three-dimensional geometric simulation particle model of tobacco leaves;

[0135] The simulation calculation module 103 is used to simulate the movement of the three-dimensional geometric simulation particle model of the tobacco leaves with the initial material holding amount within the three-dimensional geometric simulation model of the loose leaf-wetting cylinder.

[0136] The digital twin motion simulation system for tobacco leaves in a loose leaf-lubricating cylinder provided in this invention obtains a large amount of experimental data through computer simulation testing. This data is compared and analyzed with actual production data, providing a basis for the design of the loose leaf-lubricating cylinder and the angle of the lifting plates. The system allows for the adjustment of the loose leaf-lubricating cylinder's process and geometric parameters, reducing waste during tobacco production. It facilitates the rapid and convenient construction of a three-dimensional simulation model for parameter adjustment, resulting in more accurate depiction of the falling action of tobacco leaves on the lifting plates. This optimizes the loose leaf-lubricating cylinder parameters, improves the quality and processing resistance of the tobacco leaves, and provides guidance for the loose leaf-lubricating process in cigarette manufacturing. It effectively solves the difficulty of fitting discrete particles using continuous equations, obtaining a general description of particle flow behavior through simulation of each particle. Compared to direct laboratory experiments, computer simulation effectively avoids a series of problems such as errors caused by environmental influences, energy consumption, and difficulties in observing instantaneous conditions.

[0137] The embodiments of this disclosure have now been described in detail. To avoid obscuring the concept of this disclosure, some details known in the art have not been described. Those skilled in the art can fully understand how to implement the technical solutions disclosed herein based on the above description.

[0138] While specific embodiments of this disclosure have been described in detail by way of examples, those skilled in the art should understand that the examples are for illustrative purposes only and not intended to limit the scope of this disclosure. Those skilled in the art should understand that modifications can be made to the above embodiments or equivalent substitutions can be made to some technical features without departing from the scope and spirit of this disclosure. The scope of this disclosure is defined by the appended claims.

Claims

1. A digital twin motion simulation method for tobacco leaves in a loose leaf-wetting tube, characterized in that, Includes the following steps: A 1:1 three-dimensional geometric simulation model of a loose leaf moistening cylinder is established. The three-dimensional geometric simulation model of the loose leaf moistening cylinder includes at least: a tobacco leaf inlet, a lifting plate, a cylinder body, and a tobacco leaf outlet. The cylinder body is inclined downward from the tobacco leaf inlet to the tobacco leaf outlet, and the axis of the cylinder body is inclined at a preset angle to the horizontal plane. Establish a three-dimensional geometric simulation particle model of tobacco leaves: import a two-dimensional sheet-like geometric model from an external source into the discrete element method particle media simulation software, set the shell thickness and divide the shell mesh in the discrete element method particle media simulation software, and set the actual tobacco leaves as flexible shell model particles to establish a three-dimensional geometric simulation particle model of tobacco leaves. The motion of the three-dimensional geometric simulation particle model of the tobacco leaves with the initial material holding amount within the three-dimensional geometric simulation model of the loose leaf-wetting cylinder is simulated and calculated. The simulation calculation of the motion of the three-dimensional geometric simulation particle model of the tobacco leaves with the initial material holding amount within the three-dimensional geometric simulation model of the loose leaf-wetting cylinder specifically includes: For different initial material holding amounts, the relationship between the percentage of material holding amount of the three-dimensional geometric simulation particle model of the tobacco leaf on the lifting plate and the rotation angle of the lifting plate is analyzed; For different initial material holding amounts, the relationship between the slope of the material holding percentage curve of the three-dimensional geometric simulation particle model of the tobacco leaf on the lifting plate and the rotation angle of the lifting plate is analyzed. For different cylinder rotation speeds, the relationship between the percentage of material held in the three-dimensional geometric simulation particle model of the tobacco leaves on the lifting plate and the rotation angle of the lifting plate is analyzed. For different lifting plate installation angles, the relationship between the percentage of material holding in the three-dimensional geometric simulation particle model of the tobacco leaf on the lifting plate and the rotation angle of the lifting plate is analyzed; The spatial position of any of the three-dimensional geometric simulation particles of the tobacco leaf in the cylinder changes over time. A probabilistic statistical analysis was performed on the three-dimensional geometric simulation particle model of the tobacco leaves undergoing a complete throwing motion within the cylinder.

2. The digital twin motion simulation method for tobacco leaves in a loose leaf-wetting cylinder according to claim 1, characterized in that, The establishment of a 1:1 three-dimensional geometric simulation model of the loose leaf spring cylinder specifically includes: In 3D CAD software, a 1:1 three-dimensional geometric simulation model of the loose leaf moistening cylinder is established based on the key parameters of the loose leaf moistening cylinder. The 3D geometric simulation model of the loose leaf moistening cylinder includes: tobacco leaf inlet, steam application device, circulating hot air inlet, short nail, lifting plate, cylinder body, discharge hood, ventilation system and tobacco leaf discharge outlet. The 3D geometric simulation model of the loose leaf spring cylinder, created at a 1:1 scale in 3D CAD software, is saved and imported into the discrete element method particle media simulation software.

3. The digital twin motion simulation method for tobacco leaves in a loose leaf-wetting tube according to claim 1, characterized in that, The digital twin motion simulation method also includes: Based on the simulation calculation results of the tobacco leaves with the initial material holding in the loose leaf-wetting cylinder, the rotational speed of the cylinder and the installation angle of the lifting plate are determined.

4. The digital twin motion simulation method for tobacco leaves in a loose wetting tube according to claim 3, characterized in that, The determined rotational speed of the cylinder is 15 rpm; the determined installation angle of the lifting plate is 80°. o .

5. The digital twin motion simulation method for tobacco leaves in a loose wetting tube according to claim 4, characterized in that, The digital twin motion simulation method also includes: The rotational speed of the cylinder is 15 rpm, and the installation angle of the lifting plate is 80 degrees. o In this case, based on the simulation calculation results of the tobacco leaves with the initial material holding amount in the loose leaf-wetting cylinder, the inclination angle between the axis of the cylinder and the horizontal line is determined.

6. The digital twin motion simulation method for tobacco leaves in a loose leaf-wetting cylinder according to claim 5, characterized in that, The rotational speed of the cylinder is 15 rpm, and the installation angle of the lifting plate is 80 degrees. o In this case, the determined angle between the axis of the cylinder and the horizontal line is 3°. o .

7. The digital twin motion simulation method for tobacco leaves in a loose wetting tube according to claim 1, characterized in that, The digital twin motion simulation method also includes: Visual analysis of the movement of tobacco leaves within a loose leaf-wetting tube.

8. A digital twin motion simulation system for tobacco leaves in a loose wetting tube using the method described in any one of claims 1-7, characterized in that, include: The loose leaf moistening cylinder modeling module is used to establish a 1:1 three-dimensional geometric simulation model of the loose leaf moistening cylinder. The three-dimensional geometric simulation model of the loose leaf moistening cylinder includes at least: a tobacco leaf inlet, a lifting plate, a cylinder body, and a tobacco leaf outlet. The cylinder body is inclined downward from the tobacco leaf inlet to the tobacco leaf outlet, and the axis of the cylinder body is inclined at a preset angle to the horizontal plane. The tobacco leaf modeling module is used to create a three-dimensional geometric simulation particle model of tobacco leaves. The simulation calculation module is used to simulate and calculate the movement of the three-dimensional geometric simulation particle model of the tobacco leaves with the initial material holding amount within the three-dimensional geometric simulation model of the loose leaf-wetting cylinder.

Images