A virtual simulation system for a melt spinning screw extrusion process

Abstract

This invention provides a virtual simulation system for the melt spinning screw extrusion process. The system includes: an animation module: setting parameters for a 3D model to create 3D dynamic virtual objects of the equipment components in the melt spinning screw extrusion process, resulting in a 3D model of the melt spinning screw extrusion process; a back-end data module: establishing mathematical models of the partially filled area, fully filled area, and coupling interface of the melt spinning screw extrusion process, obtaining process indicators from the mathematical model, storing them in a real-time database, and transmitting them to a data table in the front-end interactive module; and a front-end interactive module: inputting input parameters; displaying the process indicators of the mathematical model through the data table; inputting 3D model setting parameters; and presenting a 3D animation of the melt spinning screw extrusion 3D model. The solution proposed in this invention comprehensively showcases the operation of the melt spinning screw extrusion process from a 3D dynamic perspective, allowing operators and trainees to experience the realistic environment of melt spinning screw extrusion firsthand.

Description

Technical Field

[0001] This invention belongs to the field of industrial process virtual simulation, and in particular relates to a virtual simulation system for melt spinning screw extrusion process. Background Technology

[0002] Based on the different properties of the fiber-forming polymers, chemical fiber spinning methods mainly fall into two categories: melt spinning and solution spinning. Melt spinning is suitable for fiber-forming polymers that do not undergo significant decomposition in the molten state, such as polyamide fibers and polyester fibers. Compared to solution spinning, melt spinning is simpler, has higher spinning speeds, lower spinning costs, and shorter process flows, and does not require solvent and precipitant recovery. Therefore, most chemical fibers are produced using melt spinning. However, due to limitations in spinning equipment and control technology, it is difficult to establish high-quality melt spinning production lines in China, resulting in slow spinning speeds and substandard production efficiency. Therefore, it is necessary to accelerate digital and intelligent transformation and create an integrated industrial internet platform that combines real-time data, management information systems, and application programs.

[0003] Virtual reality (VR) technology is a computer simulation system that can create and experience virtual worlds. It encompasses computer technology, electronic information technology, and simulation technology, and features immersion, interactivity, multi-sensory perception, imaginative possibilities, and autonomy. With the continuous development of social productivity and science and technology, the demand for VR technology is increasingly strong across various industries. Applying VR technology to the melt spinning screw extrusion process can deepen operators' intuitive understanding of the process, allowing users to operate freely and receive feedback that closely resembles a real environment. Summary of the Invention

[0004] To address the aforementioned technical problems, this invention proposes a virtual simulation system for the melt spinning screw extrusion process, thereby resolving these issues.

[0005] The first aspect of this invention discloses a virtual simulation system for the melt spinning screw extrusion process, the system comprising: an animation module, a front-end interaction module, and a back-end data module;

[0006] The animation module employs 3D graphics modeling software and a 3D visualization browser engine. By setting parameters for the 3D model, it establishes 3D dynamic virtual objects of equipment components in the melt spinning screw extrusion process, thus obtaining a 3D model of the melt spinning screw extrusion. The 3D model of the melt spinning screw extrusion is packaged into a reusable component and nested into the front-end interaction module.

[0007] The backend data module establishes a mathematical model of the partially filled zone, the fully filled zone, and the coupling interface of the melt spinning screw extrusion process. It inputs the input parameters into the mathematical model, obtains the process indicators of the mathematical model, stores them in the real-time database, and transmits them to the data table of the front-end interaction module.

[0008] The front-end interaction module: takes in the input parameters; and displays the process indicators of the mathematical model through the data table.

[0009] Input the parameters for the three-dimensional model; present a three-dimensional animation of the three-dimensional model of the melt spinning screw extrusion, and display the image.

[0010] According to the system of the first aspect of the present invention, the method for obtaining a three-dimensional model of the melt spinning screw extrusion process by using three-dimensional graphics modeling software and a three-dimensional visualization browser engine, and setting parameters of the three-dimensional model to establish a three-dimensional dynamic virtual object of the equipment components of the melt spinning screw extrusion process includes:

[0011] Step 11: Select all cross-sections of the equipment for the melt spinning screw extrusion process and sketch the model. Use the proportional scaling geometric configuration method to establish the appearance attributes of the equipment components for the melt spinning screw extrusion process.

[0012] Step 12: Based on the sketched model of the equipment for the melt spinning screw extrusion process, and combined with the actual layout of the equipment components in the melt spinning screw extrusion process, create a three-dimensional static model of the equipment components.

[0013] Step 13: Export the entire 3D static model to the 3D visualization browser engine, and adjust the position and size of the 3D static model in the 3D visualization browser engine;

[0014] Step 14: Write the control program script for the 3D visualization browser engine, add a camera, mesh, light source and renderer, import the program script into the 3D static model, select a predefined light source and find a predefined angle by adjusting the position of the camera; according to the equipment of the real melt spinning screw extrusion process, attach base material and shader material to the 3D static model;

[0015] Step 15: Add track controller and position control functions to the control program script, and set the subordinate relationship of the equipment in the three-dimensional static model; set parameters through the three-dimensional model, that is, display the material temperature in segments by barrel temperature, and display different spinning fluid colors according to the material temperature distribution in different areas, to complete the transformation of the three-dimensional static model into a three-dimensional dynamic model and obtain the three-dimensional model of melt spinning screw extrusion.

[0016] According to a system based on a first aspect of the present invention, the equipment components include: a screw, a sleeve, a feeding hopper, a spinning box, a spinneret, a metering pump, a melt polymer, a spinning fluid, a temperature-regulating air box, an oil wheel, a guide disc, and a friction roller;

[0017] The method for segmenting material temperature based on barrel temperature includes:

[0018] The temperature range of the tub is from 2 to 8 segments, corresponding to the colors of the spinning fluid: sky blue, grass green, pinkish purple, rose red, coffee, orange, vermilion, and burnt brown.

[0019] According to the system of the first aspect of the present invention, the method for establishing a mathematical model of the partially filled zone, the fully filled zone, and the coupling interface of the melt spinning screw extrusion process includes:

[0020] Step 21: Using screw pitch, material density, material specific heat capacity, viscous dissipation coefficient, screw extruder length, effective volume of screw extruder, material-barrel exchange area, and material-barrel heat exchange coefficient as input parameters, and screw speed, barrel temperature, and material viscosity as operating variables, establish the mass conservation equations for the partially filled zone, energy conservation equations for the partially filled zone, the fully filled zone, and the overall mass conservation equation for the melt zone in the melt spinning screw extrusion process.

[0021] Step 22: By solving the mass conservation equation of the partially filled zone, the energy conservation equation of the partially filled zone, the mass conservation equation of the fully filled zone, the energy conservation equation of the fully filled zone, and the overall mass conservation equation of the melt zone in the melt spinning screw extrusion process, a mathematical model capable of outputting process indicators is obtained. These process indicators include the filling rate, the material temperature in the partially filled zone, the material temperature in the fully filled zone, the length of the fully filled zone, and the outlet pressure.

[0022] According to the system of the first aspect of the present invention, the mathematical model of the output fill rate is:

[0023]

[0024] Where z is the spatial distribution variable of the screw extruder, F in Where ρ is the feed rate, ρ is the material density, and V is the feed rate. eff The effective volume of the screw extruder, N e f is the screw speed. pe (z) represents the fill rate.

[0025] According to the system of the first aspect of the present invention, the mathematical model for the length of the output fully filled region is:

[0026]

[0027] Where L is the length of the screw extruder, B is the pressure-flow coefficient, and k d l is a constant describing the geometric characteristics of the mold. e The length of the fully filled area.

[0028] According to the system of the first aspect of the present invention, the mathematical model for the output partial filling zone material temperature and the fully filled zone material temperature is as follows:

[0029]

[0030]

[0031] Where a1, a2, r1, r2, r3, and r4 are model coefficients, and T pe (z) represents the temperature of the material in the partially filled zone, T fe (z) represents the temperature of the material in the fully filled zone.

[0032] According to the system of the first aspect of the present invention, the mathematical model of the output outlet pressure is as follows:

[0033]

[0034] Where t is time, η is the material viscosity, ρ is the material density, and V eff Where N is the effective volume of the screw extruder, L is the screw speed, L is the length of the screw extruder, l(t) is the length of the fully filled zone, B is the pressure-flow coefficient, and k is the effective volume of the screw extruder. d These are constants that describe the geometric features of the mold.

[0035] A second aspect of the present invention provides an electronic device comprising a memory and a processor, wherein the memory stores a computer program that, when executed by the processor, performs a method in a virtual simulation system for a melt spinning screw extrusion process as described in the first aspect of the present invention.

[0036] A third aspect of the present invention provides a storage medium storing a computer program that can be executed by one or more processors and can be used to implement a method in a virtual simulation system for a melt spinning screw extrusion process as described in the first aspect of the present invention.

[0037] As can be seen, the solution proposed in this invention can simulate and reproduce the melt spinning screw extrusion process, showcasing the operation of the melt spinning screw extrusion process from a comprehensive three-dimensional dynamic perspective. It possesses high realism, real-time performance, and interactivity, allowing operators to experience the realistic environment of melt spinning screw extrusion firsthand. The application of digital and computer technologies enhances operators' understanding of the actual melt spinning production process and environment. Simultaneously, this virtual simulation system can also be used for experimental teaching in universities, helping to improve teaching efficiency, reduce teaching costs, and enhance teaching safety. Attached Figure Description

[0038] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0039] Figure 1 This is a structural diagram of a virtual simulation system for a melt spinning screw extrusion process according to an embodiment of the present invention;

[0040] Figure 2 This is a schematic diagram illustrating the implementation of a virtual simulation system for the melt spinning screw extrusion process according to an embodiment of the present invention.

[0041] Figure 3 This is a schematic diagram of the melt spinning screw extrusion process according to an embodiment of the present invention;

[0042] Figure 4 This is a structural diagram of an electronic device according to an embodiment of the present invention.

[0043] In the diagram, 1-screw extruder, 2-feed port. Detailed Implementation

[0044] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0045] The first aspect of this invention discloses a virtual simulation system for the melt spinning screw extrusion process. Figure 1 This is a structural diagram of a virtual simulation system for a melt spinning screw extrusion process according to an embodiment of the present invention. Figure 3The description above refers to the melt spinning screw extrusion process, which includes a screw extruder 1 and a feed port 2. Specifically, as follows... Figure 1 As shown, the system includes: an animation module, a front-end interaction module, and a back-end data module;

[0046] The animation module employs 3D graphics modeling software and a 3D visualization browser engine. By setting parameters for the 3D model, it establishes 3D dynamic virtual objects of equipment components in the melt spinning screw extrusion process, thus obtaining a 3D model of the melt spinning screw extrusion. The 3D model of the melt spinning screw extrusion is packaged into a reusable component and nested into the front-end interaction module.

[0047] The backend data module establishes a mathematical model of the partially filled zone, the fully filled zone, and the coupling interface of the melt spinning screw extrusion process. It inputs the input parameters into the mathematical model, obtains the process indicators of the mathematical model, stores them in the real-time database, and transmits them to the data table of the front-end interaction module.

[0048] Front-end interaction module: Input the input parameters; display the process indicators of the mathematical model through the data table;

[0049] Input the parameters for the three-dimensional model; present a three-dimensional animation of the three-dimensional model of the melt spinning screw extrusion, and display the image.

[0050] In some embodiments, the method of using 3D graphics modeling software and a 3D visualization browser engine to establish 3D dynamic virtual objects of equipment components in the melt spinning screw extrusion process by setting parameters of the 3D model, and obtaining a 3D model of the melt spinning screw extrusion includes:

[0051] Step 11: Select all cross-sections of the equipment for the melt spinning screw extrusion process and sketch the model. Use the proportional scaling geometric configuration method to establish the appearance attributes of the equipment components for the melt spinning screw extrusion process.

[0052] Step 12: Based on the sketched model of the equipment for the melt spinning screw extrusion process, and combined with the actual layout of the equipment components in the melt spinning screw extrusion process, create a three-dimensional static model of the equipment components.

[0053] Step 13: Export the entire 3D static model to the 3D visualization browser engine. Adjust the position and size of the 3D static model in the 3D visualization browser engine. Use the left mouse button to move the 3D static model, the mouse wheel to scale the 3D static model, and the right mouse button to rotate the 3D static model.

[0054] Step 14: Write the control program script for the 3D visualization browser engine, add a camera, mesh, light source and renderer, import the program script into the 3D static model, select a predefined light source and find a predefined angle by adjusting the position of the camera; according to the equipment of the real melt spinning screw extrusion process, attach base material and shader material to the 3D static model;

[0055] Step 15: Add track controller and position control functions to the control program script, and set the subordinate relationship of the equipment in the three-dimensional static model; set parameters through the three-dimensional model, namely barrel temperature, to display the material temperature in segments, and display different spinning fluid colors according to the material temperature distribution in different areas, thus completing the transformation of the three-dimensional static model into a three-dimensional dynamic model and obtaining the three-dimensional model of melt spinning screw extrusion.

[0056] The equipment components include: screw, sleeve, feeding funnel, spinning box, spinneret, metering pump, melt polymer, spinning fluid, temperature control air box, oil wheel, guide disc, and friction roller;

[0057] The method for segmenting material temperature based on barrel temperature includes:

[0058] The temperature range of the tub is 2 to 8 segments, corresponding to the colors of the spinning fluid: sky blue, grass green, pinkish purple, rose red, coffee, orange, vermilion, and burnt brown.

[0059] In some embodiments, the method for establishing a mathematical model of the partially filled region, the fully filled region, and the coupling interface of the melt spinning screw extrusion process includes:

[0060] Step 21: Using screw pitch, material density, material specific heat capacity, viscous dissipation coefficient, screw extruder length, effective volume of screw extruder, material-barrel exchange area, and material-barrel heat exchange coefficient as input parameters, and screw speed, barrel temperature, and material viscosity as operating variables, establish the mass conservation equations for the partially filled zone, energy conservation equations for the partially filled zone, the fully filled zone, and the overall mass conservation equation for the melt zone in the melt spinning screw extrusion process.

[0061] Step 22: By solving the mass conservation equation of the partially filled zone, the energy conservation equation of the partially filled zone, the mass conservation equation of the fully filled zone, the energy conservation equation of the fully filled zone, and the overall mass conservation equation of the melt zone in the melt spinning screw extrusion process, a mathematical model is obtained that can output process indicators, namely, filling rate, material temperature in the partially filled zone, material temperature in the fully filled zone, length of the fully filled zone, and outlet pressure.

[0062] The mathematical model for the output fill rate is:

[0063]

[0064] Where z is the spatial distribution variable of the screw extruder, F in Where ρ is the feed rate, ρ is the material density, and V is the feed rate. eff The effective volume of the screw extruder, N e f is the screw speed. pe (z) represents the fill rate.

[0065] The mathematical model for the length of the fully filled output region is:

[0066]

[0067] Where L is the length of the screw extruder, B is the pressure-flow coefficient, and k d l is a constant describing the geometric characteristics of the mold. e The length of the fully filled area.

[0068] The mathematical model for the material temperature in the partially filled area and the material temperature in the fully filled area is as follows:

[0069]

[0070]

[0071] Where a1, a2, r1, r2, r3, and r4 are model coefficients, and T pe (z) represents the temperature of the material in the partially filled zone, T fe (z) represents the temperature of the material in the fully filled zone.

[0072] The mathematical model for export pressure is:

[0073]

[0074] Where t is time, η is the material viscosity, ρ is the material density, and V effWhere N is the effective volume of the screw extruder, L is the screw speed, L is the length of the screw extruder, l(t) is the length of the fully filled zone, B is the pressure-flow coefficient, and k is the effective volume of the screw extruder. d These are constants that describe the geometric features of the mold.

[0075] In some embodiments, the front-end interaction module includes a user information display page, a user information editing page, a simulation parameter input page, a result data table display page, a result data image display page, and a 3D animation display page.

[0076] On the parameter page of the front-end interaction module, when the input parameter is empty or not a number, the simulation request cannot be submitted, and a text warning pops up as feedback; if there is no warning, a network request is initiated to store all input parameters in the real-time database.

[0077] The data table on the page displays the final steady-state data, except for the last column. The last column is presented as an attachment, which can be downloaded by clicking on it. The attachment contains the steady-state process of the corresponding result data.

[0078] In some embodiments, the front-end interaction module further includes: the data image display page uses two-dimensional line graphs and three-dimensional surface graphs to draw the changes in process indicators, and the images have browser size adaptation function.

[0079] Example 1:

[0080] A virtual simulation system for the melt spinning screw extrusion process, specifically as follows: Figure 1 and Figure 2 As shown, the system includes: an animation module, a front-end interaction module, and a back-end data module;

[0081] The animation module employs 3D graphics modeling software and a 3D visualization browser engine. By setting parameters for the 3D model, it establishes 3D dynamic virtual objects of equipment components in the melt spinning screw extrusion process, thus obtaining a 3D model of the melt spinning screw extrusion. The 3D model of the melt spinning screw extrusion is packaged into a reusable component and nested into the front-end interaction module.

[0082] The backend data module establishes a mathematical model of the partially filled area, the fully filled area, and the coupling interface of the melt spinning screw extrusion process. It inputs the input parameters into the mathematical model to obtain the process indicators of the mathematical model, stores them in the real-time database, and transmits them to the data table and the three-dimensional model of the melt spinning screw extrusion of the front-end interaction module.

[0083] Front-end interaction module: Input the input parameters; display the process indicators of the mathematical model through the data table;

[0084] Input the parameters for the three-dimensional model; present a three-dimensional animation of the three-dimensional model of the melt spinning screw extrusion, and display the image.

[0085] The method for establishing mathematical models of the partially filled zone, the fully filled zone, and the coupling interface in the melt spinning screw extrusion process includes:

[0086] Step S101: Select all cross-sections of the equipment used in the industrial production process to establish the melt spinning screw extrusion process and sketch the model. Use the proportional scaling geometric configuration method to establish the appearance attributes of the equipment components of the melt spinning screw extrusion process, such as length, width, height, and diameter.

[0087] Step 102: Use Blender 3D graphics software to create a 3D model; based on the sketch design, add basic objects such as cubes, cylinders, tori, cones, latitude and longitude spheres, planes, and path curves in Blender software. Use operations such as moving, scaling, rotating, circling, interpolating, chamfering, perspective, and looping edges to make the added basic objects into the preliminary equipment parts of the melt spinning screw extrusion process, and obtain a 3D static model;

[0088] Step 103: In edit mode, optimize points, lines, and surfaces, add cutting lines, extrude each surface, and modify the curvature at the connection of the cylinders;

[0089] Step 104: Create the spinning melt flow effect; Create a new cube, change the texture to wireframe, create a new warp and weft sphere and place it inside the cube, add fluid properties to the cube, type is domain, domain type is liquid, and check liquid and mesh. At this time, the cube becomes solid, and needs to be converted back to wireframe; Add fluid properties to the warp and weft sphere, type is flow, fluid type is liquid;

[0090] Step 105: Create a silk-like effect; create a new path curve, increase the number of curve segment points in edit mode, change the curve length by moving the positions of the first and last segment points, and adjust the curvature of the curve by moving the positions of the remaining segment points, so that part of the curve wraps around the cylinder.

[0091] Step 106: Adjust the material parameters of the 3D static model; adjust the metallicity, specular intensity, and roughness of each model component according to the actual production environment, from 0 to 1 corresponding to from nothing to something, and fine-tune the IOR refractive index and self-luminous intensity;

[0092] Step 107: Export the completed melt spinning equipment model in GLB format to the 3D visualization browser engine;

[0093] Step 108: Initialize the 3D browser engine; import the gbl format model file through the loader, create the camera, scene, renderer, coordinate axes, and add parallel light sources and point light sources;

[0094] Step 109: Control the melt flow rate and the guide wire winding speed; create control variables for movement and rotation in the 3D scene in the 3D visualization browser engine program script, introduce trajectory controls, associate the created control variables, and set the adjustment range of the control parameters;

[0095] Step 110: Display the material temperature in segments based on the barrel temperature. The segment range is 2 to 8 segments, and the corresponding spinning fluid colors are sky blue, grass green, pinkish purple, rose red, coffee, orange, vermilion, and burnt brown, respectively.

[0096] Step 111: Adjust the camera position to achieve the lens tracking effect; create a trajectory constructor in the 3D visualization browser engine program script to control the camera track, and use the maxZoom and minZoom properties to zoom in and out of the camera. After modifying the camera position, the camera center point needs to be redefined in the rendering function to adjust the tilt angle.

[0097] Step 112: Encapsulate the 3D model of the melt spinning screw extrusion into a reusable component and apply it to the page display of the front-end interactive module to achieve adaptive functionality based on the browser window size.

[0098] The method for establishing mathematical models of the partially filled zone, the fully filled zone, and the coupling interface in the melt spinning screw extrusion process includes:

[0099] Step 201: Let the screw pitch be ξ, set to 0.023m, the screw speed be N, ranging from 500rpm to 1100rpm, and the transient fill rate be f. p The transient material temperature is T. p The barrel temperature is T. b (x), the material viscosity is η, the material density is ρ, and it is set to 900 kg / m³. 3 The specific heat capacity of the material is c p The value is set to 1860 J / kgK, and the viscous dissipation coefficient is μ. p Set to 1.1×10 -4 The effective volume of the extruder is V eff Set to 1.7537×10 -7 m 3 The exchange area between the material and the barrel is S. ech Set to 1×10 -3 m 2 The heat exchange coefficient between the material and the barrel is α, ranging from 200 J / m. 2 sK~800J / m2 The mass conservation equation for the partially filled region during the melt spinning screw extrusion process is as follows:

[0100]

[0101] The energy conservation equation for the partially filled region in the melt spinning screw extrusion process is as follows:

[0102]

[0103] Step 202: Let the outlet pressure inside the fully filled zone be p, and the material flow rate at the mold outlet be F. d The pressure difference is Δp, where Δp = p(L,t) - p0, and the pressure-flow coefficient is B, ranging from 3.77 × 10⁻⁶. -14 m 4 ~3.77×10 -10 m 4 The constant describing the geometric features of the mold is k. d The range is 3.9843 × 10 -11 m 3 ~6.9843×10 -11 m 3 The specific heat capacity of the material is c f Set to 1860 J / kgK, the mass conservation equation for the fully filled region in the melt spinning screw extrusion process is as follows:

[0104]

[0105] The energy conservation equation for the fully filled region in the melt spinning screw extrusion process is as follows:

[0106]

[0107] Step 203: Let t be time t, and let S be the effective surface area of ​​the screw extruder. eff Set to 7.62×10 -6 m 2 During the hot melt extrusion process, the coupling interface between the partially filled zone and the fully filled zone moves, and the length l(t) of the fully filled zone changes with time. This change can be described by the overall mass conservation equation of the melt zone in the melt spinning screw extrusion process:

[0108]

[0109] Step 204: Assuming the temperature between the partially filled and fully filled zones is continuous during melt spinning screw extrusion, and the filling rate at the inlet is proportional to the feed rate; for ease of processing, the moving boundary is converted into a fixed boundary, and the coordinate transformation is introduced as follows:

[0110]

[0111]

[0112] Step 205: Set the time derivatives of the state variables in the above mass conservation equation and energy conservation equation to 0, and the data model is as follows:

[0113]

[0114]

[0115]

[0116]

[0117] Where f pe (z) represents the fill ratio, l e T is the length of the fully filled region. pe (z) represents the temperature of the material in the partially filled zone, T fe (z) represents the material temperature in the fully filled zone, z is the spatial distribution variable of the screw extruder, ranging from 0 to 2, L is the length of the screw extruder, set to 1.05m, and F in The feed rate is set to 1.5 kg / h, and ρ is the material density, set to 900 kg / m³. 3 N e The screw speed is in the range of 500 rpm to 1100 rpm, k. d A constant describing the geometric characteristics of the mold, ranging from 3.9843 × 10⁻⁶. -11 m 3 ~6.9843×10 -11 m 3 B is the pressure-flow coefficient, ranging from 3.77 × 10⁻⁶. -14 m 4 ~3.77×10 -10 m 4 V eff The effective volume of the screw extruder is set to 1.7537 × 10⁻⁶. -7 m 3 a1, a2, r1, r2, r3, and r4 are model coefficients, set as a1 = -47, a2 = -2.09 × 10⁻⁴, and r4 respectively. 6 r1 = 3.705, r2 = 1.26 × 10 3 r3 = 11.694, r4 = 5.53 × 10 3 ;

[0118] Step 206: Select MySQL, a relational database, as the information storage repository, and Redis, a non-relational database, as the cache database; send the input parameters from the front-end interaction module to the back-end via a network connection and store them in the MySQL database;

[0119] Step 207: Read data from the MySQL database, substitute it into the data model, obtain the calculation results of process indicators such as filling rate, material temperature, length of fully filled zone and outlet pressure, and store the process indicators in the MySQL database;

[0120] Step 208: Return the process metrics from the MySQL database to the front-end data table in the form of an application programming interface, and display them on the page accordingly.

[0121] The front-end interaction module includes a user login page, a user information display page, a user information editing page, a 3D model parameter setting and input page, a data table display page, a process indicator image display page, and a 3D animation display page; the implementation steps are as follows:

[0122] Step 301: The user enters a username, password, and verification code on the login page. The username and password have length and format restrictions. The front end verifies whether the entered data is empty and whether it conforms to the rules through form validation. After the verification is successful, the user's password is encrypted and sent to the backend server for user authentication. If the authentication is successful, programmatic routing is used to navigate to the platform homepage. Otherwise, no page redirection is performed, and a pop-up window prompts that the login failed.

[0123] Step 302: On the 3D model parameter setting and input parameter input page, set the screw pitch, material density, material specific heat capacity, viscous dissipation coefficient, screw extruder length, effective volume of screw extruder, material-barrel exchange area, material-barrel heat exchange coefficient, screw speed, barrel temperature, and material viscosity as required fields. After the form is validated, initiate a network request to pass the input parameters to the backend data module.

[0124] Step 303: Use the table component in the UI component library to display the process indicators returned by the backend in a table format on the front-end page. Except for the last column of data, all data in the data table are the final steady-state data. The last column of data is presented as an attachment. Click the attachment to download. The attachment content is the steady-state process of the corresponding result data.

[0125] Step 304: Use the data visualization chart library ECharts to draw the result data images and display the process indicators returned by the backend on the front-end page in the form of line charts, histograms, and pie charts;

[0126] Step 305: Introduce reusable components of the melt spinning screw extrusion 3D model into the program script of the front-end interaction module for single-page display; achieve front-end language internationalization through global configuration of language dependencies, and switch between Chinese and English with one click.

[0127] In summary, the technical solutions of this invention have the following advantages compared with existing technologies: This invention can simulate and reproduce the melt spinning screw extrusion process, comprehensively showcasing the operation of the melt spinning screw extrusion process from a three-dimensional dynamic perspective. It possesses high realism, real-time performance, and interactivity, allowing operators to experience the realistic environment of melt spinning screw extrusion firsthand. The application of digital and computer technologies enhances operators' understanding of the actual melt spinning production process and environment. Simultaneously, this virtual simulation system can also be used for experimental teaching in universities, helping to improve teaching efficiency, reduce teaching costs, and enhance teaching safety.

[0128] The second aspect of the present invention discloses an electronic device, including a memory and a processor. The memory stores a computer program, and when the processor executes the computer program, it implements the steps of a method in a virtual simulation system for a melt spinning screw extrusion process according to any one of the first aspects of the present invention.

[0129] Figure 4 This is a structural diagram of an electronic device according to an embodiment of the present invention, such as... Figure 4 As shown, the electronic device includes a processor, memory, communication interface, display screen, and input device connected via a system bus. The processor provides computing and control capabilities. The memory includes non-volatile storage media and internal memory. The non-volatile storage media stores the operating system and computer programs. The internal memory provides an environment for the operation of the operating system and computer programs stored in the non-volatile storage media. The communication interface is used for wired or wireless communication with external terminals; wireless communication can be achieved through Wi-Fi, carrier networks, Near Field Communication (NFC), or other technologies. The display screen can be an LCD screen or an e-ink screen. The input device can be a touch layer covering the display screen, buttons, a trackball, or a touchpad mounted on the device's casing, or an external keyboard, touchpad, or mouse.

[0130] Those skilled in the art will understand that Figure 4 The structure shown is merely a structural diagram of the part related to the technical solution of this disclosure and does not constitute a limitation on the electronic device to which the solution of this application is applied. The specific electronic device may include more or fewer components than shown in the figure, or combine certain components, or have different component arrangements.

[0131] The third aspect of the present invention discloses a storage medium, specifically relating to a computer-readable storage medium, on which a computer program is stored, and when the computer program is executed by a processor, implements the steps of a method in a virtual simulation system for a melt spinning screw extrusion process according to any one of the first aspects of the present invention.

[0132] Please note that the technical features of the above embodiments can be combined arbitrarily. For the sake of brevity, not all possible combinations of the technical features in the above embodiments have been described. However, as long as the combination of these technical features does not contradict each other, it should be considered within the scope of this specification. The above embodiments only illustrate several implementation methods of this application, and their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of the invention patent. It should be pointed out that for those skilled in the art, several modifications and improvements can be made without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this patent application should be determined by the appended claims.

Claims

1. A virtual simulation system for a melt spinning screw extrusion process, characterized by, The system includes: an animation module, a front-end interaction module, and a back-end data module; The animation module employs 3D graphics modeling software and a 3D visualization browser engine. By setting parameters for the 3D model, it establishes 3D dynamic virtual objects of equipment components in the melt spinning screw extrusion process, thus obtaining a 3D model of the melt spinning screw extrusion. The 3D model of the melt spinning screw extrusion is packaged into a reusable component and nested into the front-end interaction module. The backend data module establishes a mathematical model of the partially filled area, the fully filled area, and the coupling interface of the melt spinning screw extrusion process. It inputs the input parameters into the mathematical model, obtains the process indicators of the mathematical model, stores them in the real-time database, and transmits them to the data table of the front-end interaction module. The front-end interaction module: takes in the input parameters; and displays the process indicators of the mathematical model through the data table. Input the parameters for the three-dimensional model; present a three-dimensional animation of the three-dimensional model of the melt spinning screw extrusion, and display the image. The method for obtaining a 3D model of a melt spinning screw extrusion process by using 3D graphics modeling software and a 3D visualization browser engine, and by setting parameters for the 3D model, includes: Step 11: Select all cross-sections of the equipment for the melt spinning screw extrusion process and sketch the model. Use the proportional scaling geometric configuration method to establish the appearance attributes of the equipment components for the melt spinning screw extrusion process. Step 12: Based on the sketched model of the equipment for the melt spinning screw extrusion process, and combined with the actual layout of the equipment components in the melt spinning screw extrusion process, create a three-dimensional static model of the equipment components. Step 13: Export the entire 3D static model to the 3D visualization browser engine, and adjust the position and size of the 3D static model in the 3D visualization browser engine; Step 14: Write the control program script for the 3D visualization browser engine, add a camera, mesh, light source and renderer, import the program script into the 3D static model, select a predefined light source and find a predefined angle by adjusting the position of the camera; according to the equipment of the real melt spinning screw extrusion process, attach base material and shader material to the 3D static model; Step 15: Add track controller and position control functions to the control program script, and set the subordinate relationship of the equipment in the three-dimensional static model; set parameters through the three-dimensional model, that is, display the material temperature in segments by barrel temperature, and display different spinning fluid colors according to the material temperature distribution in different areas, to complete the transformation of the three-dimensional static model into a three-dimensional dynamic model and obtain the three-dimensional model of melt spinning screw extrusion. The method for establishing mathematical models of the partially filled zone, the fully filled zone, and the coupling interface in the melt spinning screw extrusion process includes: Step 21: Using screw pitch, material density, material specific heat capacity, viscous dissipation coefficient, screw extruder length, effective volume of screw extruder, material-barrel exchange area, and material-barrel heat exchange coefficient as input parameters, and screw speed, barrel temperature, and material viscosity as operating variables, establish the mass conservation equations for the partially filled zone, energy conservation equations for the partially filled zone, the fully filled zone, and the overall mass conservation equation for the melt zone in the melt spinning screw extrusion process. Step 22: By solving the mass conservation equation of the partially filled zone, the energy conservation equation of the partially filled zone, the mass conservation equation of the fully filled zone, the energy conservation equation of the fully filled zone, and the overall mass conservation equation of the melt zone in the melt spinning screw extrusion process, a mathematical model capable of outputting process indicators is obtained. These process indicators include the filling rate, the material temperature in the partially filled zone, the material temperature in the fully filled zone, the length of the fully filled zone, and the outlet pressure.

2. A virtual simulation system for a melt spinning screw extrusion process according to claim 1, characterized in that The equipment components include: screw, sleeve, feeding funnel, spinning box, spinneret, metering pump, melt polymer, spinning fluid, temperature control air box, oil wheel, guide disc, and friction roller; The method for segmenting material temperature based on barrel temperature includes: The temperature range of the tub is from 2 to 8 segments, corresponding to the colors of the spinning fluid: sky blue, grass green, pinkish purple, rose red, coffee, orange, vermilion, and burnt brown.

3. The virtual simulation system of a melt spinning screw extrusion process according to claim 1, characterized in that The mathematical model for the fill rate is: in, For the spatial distribution variables of the screw extruder, For feed rate, For material density, The effective volume of the screw extruder. The screw speed is... This represents the fill rate.

4. The virtual simulation system for the melt spinning screw extrusion process according to claim 3, characterized in that, The mathematical model for the length of the fully filled region is: in, The length of the screw extruder. The pressure-flow coefficient is... A constant describing the geometric features of the mold. The length of the fully filled area.

5. A virtual simulation system for the melt spinning screw extrusion process according to claim 4. Its features are, The mathematical models for the material temperature in the partially filled zone and the fully filled zone are as follows: in, , , , , and These are the model coefficients. For the temperature of the material in the partially filled area, The temperature of the material in the fully filled zone.

6. The virtual simulation system for the melt spinning screw extrusion process according to claim 5, characterized in that, The mathematical model for the outlet pressure is: in, For a moment, For material viscosity, For material density, The effective volume of the screw extruder. The screw speed is... The length of the screw extruder. The length of the fully filled region. The pressure-flow coefficient is... These are constants that describe the geometric features of the mold.

7. An electronic device, characterized in that, The system includes a memory and a processor, wherein the memory stores a computer program that, when executed by the processor, performs a method in a virtual simulation system for a melt spinning screw extrusion process as described in any one of claims 1 to 6.

8. A storage medium, characterized in that, The computer program stored in the storage medium can be executed by one or more processors and can be used to implement the method in a virtual simulation system for a melt spinning screw extrusion process as described in any one of claims 1 to 6.

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