CN114398738A - Vertical planetary mixer stirring device structure analysis method based on DEM-FEM coupling - Google Patents
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Abstract
The invention relates to a vertical planetary mixer stirring device structure analysis method based on DEM-FEM coupling, which comprises the following steps: s1, constructing a three-dimensional model of the vertical planetary mixer; step S2: importing the model into a Mesh module of an ANSYS Workbench for grid division; step S3: importing the divided grid file into the EDEM; step S4: carrying out analog simulation according to the actual working condition to obtain stress data of the stirring device; step S5: importing the stress data into ANSYS and synchronizing the stress data to a Static Structural module; step S6: carrying out static structure analysis on the stirring device; and step S7, analyzing and optimizing the dangerous section of the structure based on the static structure analysis structure. The invention realizes the rapid and effective structural analysis of the stirring device and provides a reliable foundation for the design of the stirring device of the vertical planetary stirrer.
Description
Technical Field
The invention relates to the technical field of mechanical equipment design and structure optimization, in particular to a vertical planetary mixer stirring device structure analysis method based on DEM-FEM coupling.
Background
The vertical planetary stirrer is a high-efficiency forced stirrer with wide application range, and mainly comprises a revolution sun gear stirring component with low rotation speed and a rotation planet gear stirring component with high rotation speed. The core parts mainly comprise: the device comprises a driving motor, a reduction gearbox, a stirring barrel, a sun wheel stirring arm, a planet wheel stirring arm, stirring blades, a stirring scraper and the like. The stirring device driven by the motor rotates in the stirring barrel, so that the materials carry out convection motion, diffusion motion and shearing motion in the stirring barrel. The vertical planetary mixer is suitable for concrete, mortar, medicine, chemical industry, food and other technological processes involving stirring and mixing, particle dispersion, accelerated dissolution, reaction and the like of multi-component solid-solid phase, solid-liquid phase and liquid-liquid phase materials.
The stirring device of the stirrer mainly comprises a stirring shaft, a stirring arm and stirring blades, and has important influence on the performance and the working quality of the stirrer. The phenomenon that the stirring device cracks or even breaks sometimes occurs in the production and use processes of the stirrer, the service life of the stirrer is seriously influenced, the production efficiency is reduced, and serious economic loss is caused. Therefore, at the beginning of the design of the stirrer, the stress distribution and stress concentration problems of the stirring device are considered, and the normal service life of the stirrer is ensured to the maximum extent. The stirring device of the stirrer is driven to rotate by the stirring transmission mechanism, the stirring blade is subjected to the resistance of the mixture to enable the stirring arm and the stirring blade to deform, and the mixing and stirring process is quite complex. However, the theoretical method for structural analysis of the stirring device of the stirring machine is still relatively deficient at present, so that the problems of low design efficiency, resource waste and the like are easily caused, and how to efficiently analyze the structure of the stirring device of the stirring machine becomes a technical difficulty to be solved.
The project sources of the invention are as follows: 'Quanzhou city science and technology program subsidized' (2021C 007R).
Disclosure of Invention
In view of this, the invention aims to provide a vertical planetary mixer stirring device structure analysis method based on DEM-FEM coupling, which realizes rapid and effective stirring device structure analysis and provides a reliable basis for the design of a stirring device of a vertical planetary mixer.
In order to achieve the purpose, the invention adopts the following technical scheme:
a structural analysis method for a stirring device of a vertical planetary stirrer based on DEM-FEM coupling comprises the following steps:
s1, constructing a three-dimensional model of the vertical planetary mixer;
step S2: importing the model into a Mesh module of an ANSYS Workbench for grid division;
step S3: importing the divided grid file into the EDEM;
step S4: carrying out analog simulation according to the actual working condition to obtain stress data of the stirring device;
step S5: importing the stress data into ANSYS and synchronizing the stress data to a Static Structural module;
step S6: carrying out static structure analysis on the stirring device;
and step S7, analyzing and optimizing the dangerous section of the structure based on the static structure analysis structure.
Further, when the three-dimensional model of the vertical planetary mixer is constructed in step S1, the mixer structure is simplified, the structure irrelevant to the mixing effect is removed, and then the missing part is filled in the missing part according to the structure size of the surrounding connecting components and integrated into the large-size structure.
Further, the step S2 is specifically: the mesh division takes the triangular shell elements as the basis between the triangular shell elements and establishes a coupling mechanism between the discrete elements and the finite elements, thereby establishing DEM-FEM coupling.
Further, the step S4 is specifically:
step S41, during EDEM simulation, the pre-processing module designs the shape and sets the attribute of the particles in the stirrer on the basis of the actual situation, sets the motion of the stirring device of the stirrer, and establishes the situation of simulating the stirring of the materials in the stirrer in a particle factory;
step S42, setting an EDEM solver module;
and step S43, finding out the moment when the stirring device of the stirrer bears the maximum pressure through the Create Graph function of the EDEM post-processing module, and then exporting ANSYS Workbench Data from the pressure Data at the moment through the Export function.
Further, the step S5 is specifically: the pressure data of the stirring device of the stirrer at a certain time are led into ANSYS EDEM coupling module as Results through the plug-in EDEM _ Addin _1.0.0.exe, and transmitted to the Setup of Static Structural module.
Furthermore, a solving target is inserted into the solving scheme on the working surface of the stirring device applying the introduced load by pressure, and the solving is carried out, so as to obtain the structural analysis result of the stirring device of the stirring machine.
Further, the solution objective includes total deformation, equivalent elastic strain and equivalent stress.
Compared with the prior art, the invention has the following beneficial effects:
the invention realizes the rapid and effective structural analysis of the stirring device and provides a reliable foundation for the design of the stirring device of the vertical planetary stirrer.
Drawings
FIG. 1 is an overall flow chart of an embodiment of the present invention;
FIG. 2 is a schematic diagram of a general configuration of a vertical planetary mixer in accordance with an embodiment of the present invention; wherein: 1-a planet wheel stirring device, 2-a reduction gearbox, 3-a sun wheel stirring device, 4-a planet wheel stirring device and 5-a stirring barrel;
fig. 3 is an ANSYS software meshing setting diagram according to an embodiment of the present invention;
FIG. 4 is a grid diagram of a divided three-dimensional model of ANSYS software according to an embodiment of the present invention;
FIG. 5 is a diagram of a frame for EDEM software pre-processing module setup according to an embodiment of the present invention;
FIG. 6 is a block diagram of an EDEM software solver according to an embodiment of the present invention;
FIG. 7 is a diagram of an EDEM software post-processing module setup framework according to an embodiment of the present invention;
FIG. 8 is a diagram of the EDEM software simulation result data export setup procedure in accordance with an embodiment of the present invention;
FIG. 9 is a schematic diagram of an EDEM-ANSYS software coupled project in accordance with an embodiment of the present invention;
fig. 10 is a diagram illustrating an ANSYS software static structure analysis setup according to an embodiment of the present invention;
fig. 11 is a diagram of a result of static structure analysis of ANSYS software according to an embodiment of the present invention.
Detailed Description
The invention is further explained below with reference to the drawings and the embodiments. The project sources of the invention are as follows: 'Quanzhou city science and technology program subsidized' (2021C 007R).
Referring to fig. 1, the invention provides a structural analysis method for a vertical planetary mixer stirring device based on DEM-FEM coupling, which comprises the following steps:
step S1: as shown in fig. 2, when a three-dimensional model of a stirrer is drawn, the number of mesh divisions of the structure is greatly increased due to small-sized structures such as small-sized chamfers, bolts, screws, counterbores and the like in the stirrer component, so that the solving time is significantly increased, which is an adverse influence factor for simulation. Therefore, when a three-dimensional model of the stirrer is drawn, the structure of the stirrer needs to be simplified, a micro structure irrelevant to the stirring effect is deleted, and then the missing part is filled and integrated into a large-size structure;
step S2, as shown in the figures 3 and 4, in a finite element software ANSYS, establishing a coupling mechanism between discrete elements and the finite elements, taking a triangular shell unit as a basis between the discrete elements and the finite elements, inserting a patch conformal method in the meshing setting, selecting a division range, a geometric structure and all structures, selecting a division definition, a method and a tetrahedron, and meshing the three-dimensional model to establish DEM-FEM coupling;
step S3, importing the divided grid file into the EDEM;
step S4: as shown in fig. 5, before the EDEM simulation, the particle information including various properties, coefficients, shapes and contact parameters between particles and particles or structures should be set in Bulk Material according to actual conditions in a pre-processing module. The Material properties of the blender structure are set in the Equipment Material. And (4) introducing a stirrer model of the grid divided in the step S2 into the geometers, setting the rotating speed and the rotating direction of the moving part, and establishing the position, the speed and the sequence of the simulated material of the particle factory falling into the stirring barrel. Setting the gravity acceleration direction of the simulation space in Environment;
as shown in FIG. 6, when the minimum particle size in the mixer is 6mm, the maximum time step of iterative calculation using Euler method or Verler-Velocity method should not exceed 50% of Rayleigh time step, and the larger time step will cause particle explosion. An iterative computation method Verler-Velocity method is selected in the Time Integration, and 50% is selected for Fixed Time Step. And setting the required maximum simulation Time length in the Total Time. The storage Interval time is set to 0.02 in Target Save Interval, that is, simulation data is stored every 0.02. Setting a computing unit in the Cell Size, and generally selecting 3-5R min
As shown in fig. 7, all simulation data information may be presented in a graph format in the EDEM post-processing module. Group selects Geometry in Select Element, and Select stirring device structure to be studied. X-axis is Time, and Y-axis is Maximum Pressure. And clicking the Create Graph to obtain the stress condition of a certain stirring device in the simulation process, and finding out the time point of the maximum stress.
As shown in FIG. 8, the post-processing module clicks on File-Export-ANSYS Workbench Data, and derives the Pressure Data of the stirring device to be studied at this time point in the format of. axdt according to the time point obtained in step S5. The derived Pressure data is the coordinates of the midpoint of the surface triangle of the tetrahedral mesh file stirring device divided in step S2 and the stress value thereof.
And S5, as shown in FIG. 9, establishing a project schematic diagram in an ANSYS Workbench, wherein the module A is an EDEM-ANSYS coupling plug-in module and is used for importing the stress data of the stirring device obtained in the step S4. The module B is an ANSYS Workbench statics analysis module and is used for analyzing the structural stress characteristic of the stirring device. The specific operation is as follows: the axdt file for the stirring device stress data is imported into the Results of module A and synchronized to the Setup of module B. And introducing a three-dimensional model of the stirrer into the Geometry of the B module.
Step S6 inserting a support in the ANSYS static structure analysis module and importing the pressure data to the geometry of the stirring device to be studied, as shown in fig. 10. Inserting a static structure analysis structure to be solved into a solving scheme, such as: the total deformation, the equivalent elastic strain, the equivalent stress and the like are solved, and finally, the analysis result of the static structure of the stirring device is obtained and is shown in fig. 11.
The above description is only a preferred embodiment of the present invention, and all equivalent changes and modifications made in accordance with the claims of the present invention should be covered by the present invention.
Claims (7)
1. A vertical planetary mixer stirring device structure analysis method based on DEM-FEM coupling is characterized by comprising the following steps:
s1, constructing a three-dimensional model of the vertical planetary mixer;
step S2: importing the model into a Mesh module of an ANSYS Workbench for grid division;
step S3: importing the divided grid file into the EDEM;
step S4: carrying out analog simulation according to the actual working condition to obtain stress data of the stirring device;
step S5: importing the stress data into ANSYS and synchronizing the stress data to a Static Structural module;
step S6: carrying out static structure analysis on the stirring device;
and step S7, analyzing and optimizing the dangerous section of the structure based on the static structure analysis structure.
2. The method for analyzing the structure of the mixing device of the vertical planetary mixer based on the DEM-FEM coupling as claimed in claim 1, wherein the step S1 is to simplify the structure of the vertical planetary mixer, to remove the structure irrelevant to the mixing effect, and to fill up the missing part according to the structure size of the surrounding connecting components and to integrate the missing part into the large-sized structure when constructing the three-dimensional model of the vertical planetary mixer.
3. The method for analyzing the structure of the stirring device of the vertical planetary mixer based on DEM-FEM coupling as claimed in claim 1, wherein the step S2 is specifically as follows: the mesh division takes the triangular shell elements as the basis between the triangular shell elements and establishes a coupling mechanism between the discrete elements and the finite elements, thereby establishing DEM-FEM coupling.
4. The method for analyzing the structure of the stirring device of the vertical planetary mixer based on DEM-FEM coupling as claimed in claim 1, wherein the step S4 is specifically as follows:
step S41, during EDEM simulation, the pre-processing module designs the shape and sets the attribute of the particles in the stirrer on the basis of the actual situation, sets the motion of the stirring device of the stirrer, and establishes the situation of simulating the stirring of the materials in the stirrer in a particle factory;
step S42, setting an EDEM solver module;
and step S43, finding out the moment when the stirring device of the stirrer bears the maximum pressure through the Create Graph function of the EDEM post-processing module, and then exporting ANSYS Workbench Data from the pressure Data at the moment through the Export function.
5. The method for analyzing the structure of the stirring device of the vertical planetary mixer based on DEM-FEM coupling as claimed in claim 1, wherein the step S5 is specifically as follows: the pressure data of the stirring device of the stirrer at a certain time are led into ANSYS EDEM coupling module as Results through the plug-in EDEM _ Addin _1.0.0.exe, and transmitted to the Setup of Static Structural module.
6. The method for analyzing the structure of the stirring device of the vertical planetary stirrer based on DEM-FEM coupling as claimed in claim 1, wherein the solving target is inserted into the solving scheme on the working surface of the stirring device applying the introduced load with pressure, and the solving is carried out to obtain the structural analysis result of the stirring device of the stirrer.
7. The method as claimed in claim 6, wherein the solution objective includes total deformation, equivalent elastic strain and equivalent stress.
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