A method for ore drawing simulation and dilution calculation

Abstract

A method for ore drawing simulation and dilution calculation disclosed by the present invention includes: drawing a three-dimensional model of rocks according to the actual shape of the rocks in a three-dimensional design software, generating a three-dimensional model of a mine, and forming a multi-heading model of the mine based on the three-dimensional model of the mine; establishing a model of a transport forklift and arranging the model of the transport forklift in the multi-heading model of the mine; establishing an alternating model of ore veins and non-ore veins; importing the three-dimensional model of the rocks into the EDEM software and filling to generate a rock particle model; importing the three-dimensional model of the rocks, the multi-heading model of the mine, the alternating model of ore veins and non-ore veins, and the model of the transport forklift into the EDEM software to generate a simulation model of the mine, ore veins, surrounding rock, and forklift; setting the action parameters of the transport forklift and the bucket in the EDEM software; performing ore drawing simulation in the EDEM software; the EDEM software generates a statistical space, counts the conveying conditions of each particle, and calculates the dilution rate. The present invention can achieve accurate ore drawing simulation through the three-dimensional design software and the EDEM software.

Description

Technical Field

[0001] The present invention relates to the field of simulation research in geotechnical engineering and mining engineering, and particularly relates to a method for ore drawing simulation and dilution calculation. Background Art

[0002] With the continuous progress of technology in the field of mining engineering, the mining engineering for metal thin ore veins is increasing day by day. The exploitation of thin ore veins has characteristics such as complex geological conditions, low visualization degree, and great mining difficulty. Designers and on-site construction personnel face great challenges. People urgently hope to control the dilution rate of thin ore vein exploitation, find the optimal mining plan, and reduce the dilution rate. In this situation, it is urgent to establish an intuitive three-dimensional solid model for mining engineering, simulate the ore drawing process, calculate the dilution rate, and improve the utilization rate of mineral resources.

[0003] In recent years, with the rapid development of computer technology, numerical simulation methods have become an important means for technical analysis of mining engineering, engineering structure optimization, and prediction of ore collection rate. Rhino7 software is an extremely excellent three-dimensional modeling software, which has the ability to quickly establish complex solid models, parametrically generate surface entities, and strong software coupling ability. According to the mine plan view, it can conveniently and quickly establish a three-dimensional solid model of the mine to meet the needs of various mining engineering. However, Rhino7 software also has its own defects. Its software is mainly used for the establishment of three-dimensional solid models and is difficult to perform numerical simulation.

[0004] EDEM software is a powerful discrete element numerical simulation software. This software has the function of quickly processing large-scale discrete element simulations and strong calculation post-processing ability, which can meet the needs of ore drawing simulation in mining engineering and can solve problems such as the great difficulty of complex multi-drift ore drawing simulation and the difficulty of dilution rate calculation. However, EDEM software has weak pre-processing ability, is difficult to establish complex three-dimensional solid models of mines, cannot draw various transportation tools, and can only establish simple block, plane, and cylinder models. Only using EDEM software for simulation will consume a lot of time and energy in the model pre-processing stage, and the simulation efficiency is extremely low.

[0005] At present, there is no complete and efficient ore drawing simulation and dilution rate automatic calculation method in the mining field. It is impossible to predict in advance the ore dilution rate of ore vein mining under different mining design parameters, which is the problem of mining enterprises. The "Analysis method for reducing ore dilution rate for thin and small ore body mining" disclosed by Zhang Linlin et al. in the Chinese invention patent publication CN114741900A conducts long-term storage by excavating the ore body on site, analyzes the grade of the ore body monthly on time, counts the change of the ore body dilution rate, records a large amount of data, and conducts mining based on the summarized data and mining experience. This method takes a long time and consumes a large amount of manpower, material resources and financial resources, and cannot quickly and accurately determine the optimal ore drawing method. In addition, there are other methods that design similar simulation test devices to actually simulate the flow of ore and rock during ore drawing. However, such methods are limited by the size parameters of the test device. For different structural design parameters and ore drawing methods, test devices of different sizes need to be customized, which is not universal, and the dilution rate needs to be calculated manually, resulting in a huge workload. Summary of the Invention

[0006] To solve at least one of the problems existing in the prior art, the present invention provides an ore drawing simulation and dilution calculation method, which realizes establishing a three-dimensional solid model in Rhino7 software, importing it into EDEM software, setting simulation parameters, and performing efficient ore drawing simulation, solving the problem that it is difficult to realize ore drawing simulation in mining engineering.

[0007] The present invention is realized by at least one of the following technical solutions.

[0008] An ore drawing simulation and dilution calculation method includes the following steps:

[0009] Draw a three-dimensional model of the rock according to the actual shape of the rock in three-dimensional design software;

[0010] Generate a three-dimensional model of the mine in three-dimensional design software, and form a multi-entry model of the mine based on the three-dimensional model of the mine;

[0011] Establish a model of a transport forklift in three-dimensional design software, and arrange the model of the transport forklift in the multi-entry model of the mine;

[0012] Establish an alternating model of ore veins and non-ore veins in three-dimensional design software;

[0013] Import the three-dimensional model of the rock into EDEM software, and fill it to generate a rock particle model;

[0014] Import the three-dimensional model of the rock, the multi-entry model of the mine, the alternating model of ore veins and non-ore veins, and the model of the transport forklift into EDEM software to generate a simulation model of the mine, ore veins, surrounding rock and forklift;

[0015] Set the action parameters of the transport forklift and the bucket in EDEM software;

[0016] Conduct ore drawing simulation in EDEM software;

[0017] EDEM software generates a statistical space, counts the transportation of each particle, and calculates the dilution rate.

[0018] Preferably, the 3D design software includes but is not limited to any one of Rhino7 software and Solidworks software.

[0019] Preferably, according to the shapes of the ore and non-ore actually mined in the mine, use the polyline, control point curve, and combination tools in Rhino7 software to generate a rock line string. Through the function of creating a surface from network lines in the surface tool, combine to form a block model of rock particles. Use the mine plane design drawing as the base map, import it into the 3D design software, use the polyline segment and combination tool commands in the 3D design software to draw the specific shapes of the mined-out areas and roadways in the mine, and use the extrusion closed curve tool command in the solid tool to extrude and stretch the plane line string to generate a mine solid model. Export the STL files of the rock block and the mine model through the 3D design software.

[0020] Preferably, according to the size parameters of the roadway, establish a roadway solid model, and use the Boolean operation difference set command in the solid tool of the 3D design software to cut the mine model to form multiple access channels. According to the actual vein distribution, size, and trend in the mine, use the polyline tool in the 3D design software to draw a vein plane line string, and generate an alternating model of veins and non-veins through the extrusion closed curve command in the solid tool.

[0021] Preferably, according to the size of the transport forklift actually used underground in the mine, use the polyline segment command, combination command, extrusion closed curve tool command, Boolean operation union command, and Boolean operation difference set command in the 3D design software to form a transport forklift model and export the transport forklift STL file.

[0022] Preferably, in the Bulk Material module of EDEM software, by executing the Add Bulk Material command, set the Material value, define the rock material parameters, execute the Add Particle - Add Multi Sphere command to generate a circular particle basic unit, and define the radius of the basic circular particle unit by modifying the PhysicalRadius value.

[0023] Preferably, in the Tools options module of EDEM software, enter the Rendering Options option. In the Display Templates, execute the Import command to import the rock STL file drawn by Rhino7 software into EDEM software and generate an empty rock model. Through the Size Distribution module, execute the Size Distribution command, set the particle size to be distributed in a proportional form, set Scale By to the Radius mode, set the Minimum value to 0.5 and the Maximum value to 1.5 respectively. The particle size is distributed according to 0.5 - 1.5 times the original circular particle diameter. Execute the Display Templates command, select ore and non-ore particles respectively, execute the Select Template command, set the current rock particle material parameters, execute the Smoothing Value command, set the value, and adjust the smoothness of the circular particle unit filling the ore and non-ore STL models. Execute the Minimum Sphere Radius command, set the minimum circular particle unit size, and execute the Generate Particle command to fill and generate a solid rock particle model.

[0024] Preferably, through the Equipment Material module, execute the Add EquipmentMaterial command to define the material parameters of the mine and rock models. By setting the Poisson’sRatio value, define the material Poisson's ratio. Set the Solids Density value to define the material density value. Set the Shear Modulus value to define the material shear modulus. Execute the Interaction command to interconnect the mine model with the rock particles. Set the Coefficient of Restitution value to define the restitution coefficient of the model material. Set the Coefficient of Static Friction value to define the static friction coefficient of the model material. Set the Coefficient of Rolling Friction value to define the rolling friction coefficient of the model material.

[0025] Preferably, in the Geometries module of EDEM software, execute the Import Geometries command to import the mine, ore vein, and transport forklift models in Rhino7 software into EDEM software. Set the Type option of the ore vein and non-ore vein models to Virtual to form a non-collision module.

[0026] Preferably, in the Geometries module of EDEM software, select the ore vein and non-ore vein models respectively, execute the Add Factory command to create ore and non-ore particle units, and set the Total Number value to determine the total generation number of ore and non-ore particles.

[0027] Preferably, in the Geometries module of EDEM software, select the transport forklift model, execute the Add Motion command to assign motion parameters to the transport forklift, execute the Add Linear Translation Kinematic command to control the linear forward movement of the transport forklift, execute the Add Linear Rotation Kinematic command to control the rotation and lifting of the bucket, execute the Add Linear Translation Kinematic command to control the linear backward exit of the transport forklift from the roadway, and execute the Add Linear Rotation Kinematic command to control the rotation and unloading of the bucket of rock particles.

[0028] Preferably, in the Simulator module of EDEM software, set the Time Integration option to Euler for simulation calculation using Euler integration. Execute the Total Time command to set the total simulation time value, and execute the Target Save Interval command to set the data recording step size.

[0029] Preferably, in the Simulator Grid module of EDEM software, set the Cell Size value to 2 - 3 to determine the total number of particle units generated by the simulation. According to the user's computer configuration, set the solver and the number of CPU cores in the Selected Engine and Number of CPU Cores of the Simulator Engine module, and execute the Progress command to start the simulation.

[0030] Preferably, a statistical space is defined and generated in the EDEM software to calculate the proportion of various types of particles. Through the post-processing module, the dilution rate is automatically calculated.

[0031] Compared with the prior art, the beneficial effects of the present invention at least include:

[0032] (1) Provide a complete set of detailed processes for ore drawing simulation and dilution rate calculation in underground mines;

[0033] (2) For the first time, a three-dimensional design software is coupled with the EDEM software for ore drawing simulation. The three-dimensional design software is used for pre-processing, and through the simulation and post-processing calculation of the EDEM software, accurate ore drawing simulation is achieved. Compared with the previous ore drawing simulation in other software, a fast ore drawing simulation method is proposed.

[0034] (3) Through the ore drawing simulation and dilution calculation method of the present invention, error-free coupling between the three-dimensional design software and the EDEM software can be achieved, which not only avoids the single, repetitive and cumbersome pre-processing modeling work of engineers and researchers in the EDEM software, but also overcomes the weakness that the three-dimensional design software cannot perform simulation. It makes the ore drawing simulation in underground mines more convenient, fast and efficient.

[0035] (4) The present invention discloses a fast, efficient and accurate ore drawing simulation and dilution rate calculation method. By establishing different mine, ore vein and drift models and adjusting different structural parameters, ore drawing simulation under different mining methods and different structural design parameter conditions can be achieved, which has universality. At the same time, by setting the particle statistical space, the software can automatically calculate the dilution rate, which has high efficiency. Description of the Drawings

[0036] Figure 1 It is a flow chart of an ore drawing simulation and dilution calculation method provided by an embodiment of the present invention;

[0037] Figure 2 It is a STL model diagram of ore and rock established based on Rhino7 software in an embodiment of the present invention;

[0038] Figure 3 It is a contour map of a certain mine section imported based on Rhino7 software in an embodiment of the present invention;

[0039] Figure 4 It is a solid diagram formed by stretching the plane contour based on Rhino7 software in an embodiment of the present invention;

[0040] Figure 5 It is a solid model diagram cut by Boolean operation based on Rhino7 software in an embodiment of the present invention;

[0041] Figure 6 For the embodiment of the present invention, a forklift model diagram is drawn based on Rhino7 software;

[0042] Figure 7 For the embodiment of the present invention, a transport forklift diagram is generated based on Rhino7 software;

[0043] Figure 8 For the embodiment of the present invention, the transport forklift diagram is arranged based on Rhino7 software;

[0044] Figure 9 For the embodiment of the present invention, an alternating diagram of ore veins and non-ore veins is drawn based on Rhino7 software;

[0045] Figure 10 For the embodiment of the present invention, a complete model diagram of a certain mine in Rhino7 software;

[0046] Figure 11 For the embodiment of the present invention, a schematic diagram of importing ore-rock STL models ((a), (b), and (c) diagrams are ore-rock models with three different shapes respectively) based on EDEM software;

[0047] Figure 12 For the embodiment of the present invention, a schematic diagram of adjusting the particle size distribution of units and the smoothness of edge filling based on EDEM software;

[0048] Figure 13 For the embodiment of the present invention, an actual effect diagram of ore-rock is generated based on EDEM software;

[0049] Figure 14 For the embodiment of the present invention, a multi-entry ore-drawing model diagram of a mine is imported based on EDEM software;

[0050] Figure 15 For the embodiment of the present invention, a forward movement diagram of a transport forklift is set based on EDEM software;

[0051] Figure 16 For the embodiment of the present invention, a bucket rotation action diagram is set based on EDEM software;

[0052] Figure 17 For the embodiment of the present invention, an overall diagram of ore-discharging simulation based on EDEM software;

[0053] Figure 18 For the embodiment of the present invention, a rock block unit diagram generated by simulating ore veins and non-ore vein areas based on EDEM software;

[0054] Figure 19 For the embodiment of the present invention, an ore-drawing diagram of a transport ore truck is simulated based on EDEM software;

[0055] Figure 20This is the full-process diagram of ore drawing from multiple headings based on EDEM software simulation in the embodiments of the present invention;

[0056] Figure 21 This is the diagram of the automatic calculation of dilution rate during ore drawing based on EDEM software in the embodiments of the present invention. Specific embodiments

[0057] In order to make the objectives and advantages of the present invention clearer, the embodiments of the present invention will be further described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0058] As Figure 1 shown, a method for ore drawing simulation and dilution calculation provided by the present invention realizes generating a multi-heading solid model from a mine plane design drawing in a 3D design software and importing it into EDEM software to set the unit particle size distribution, edge filling smoothness, and motion control parameters of the particle factory and transport forklift, realizing fast simulation of the mine ore drawing process, specifically including the following steps:

[0059] Step 1: Draw a 3D model of the rock according to the actual shape of the rock in Rhino7 software and export the rock STL file.

[0060] In this step, according to the shapes of the ore and non-ore actually mined in the mine, rock wire strings are generated through polyline, control point curve, and combination tools in Rhino7 software, and a block model of rock particles is formed by combining them through the function of creating a surface from network lines in the surface tool.

[0061] In some embodiments of the present invention, as Figure 2 shown (the figure shows different angles of the same-shaped rock), this figure shows establishing ore and waste rock models in Rhino7 software according to the actual shape of the rock and exporting the rock particle STL file. In other embodiments, other 3D design software, such as Solidworks software, can also be used.

[0062] Step 2: Import the DWG drawing of a certain mine plane design into Rhino7 software.

[0063] In this step, the mine plane design drawing is used as the base map and imported into Rhino7 software.

[0064] In some embodiments of the present invention, as Figure 3 shown, this figure shows importing the DWG file of the mine plane design drawing into Rhino7 software and drawing a plane wire string.

[0065] Step 3: Stretch the plane contour of the mine in Rhino7 software to form a solid figure and generate a 3D model of the mine.

[0066] In this step, using the polyline segment and combination tool commands in Rhino7 software, draw the specific shapes of the mined - out areas and roadways in the mine. Using the extrusion of closed curves tool command in the solid tool, stretch and extrude the planar line string to generate a mine solid model. Export the STL files of the rock blocks and the mine model through Rhino7 software.

[0067] In some embodiments of the present invention, as Figure 4 shown, to smoothly generate a three - dimensional solid model that conforms to the original drawings in the later stage, generate a three - dimensional mine model in Rhino7 software through the solid extrusion command.

[0068] Step 4: Rhino7 software performs a Boolean operation to cut the three - dimensional mine model, establish the vein and surrounding rock models, and form a multi - drift mine model.

[0069] In this step, according to the size parameters of the roadway, establish a roadway solid model, and use the Boolean difference command in the solid tool of Rhino7 software to cut the three - dimensional mine model to form a multi - drift passage.

[0070] In some embodiments of the present invention, as Figure 5 shown, based on the processing of the previous step, perform a Boolean operation command in Rhino7 software to cut the three - dimensional mine model, generate the solid models of the drifts and the roadways outside the veins, generate the mined - out areas, and draw and generate the vein and surrounding rock models according to the actual vein distribution, size, and trend to form a multi - drift mine model.

[0071] Step 5: Rhino7 software draws a forklift model and generates an STL file according to the size of the mine transport forklift.

[0072] In this step, according to the size of the transport forklift actually used in the mine underground, use the polyline segment command, combination command, extrusion of closed curve tool command, Boolean union command, and Boolean difference command in Rhino7 software to form a transport forklift model and export the transport forklift STL file.

[0073] In some embodiments of the present invention, as Figure 6 and Figure 7 shown, according to the drift size and the actual transport forklift size, generate a forklift model in Rhino7 software and export the STL model file.

[0074] Step 6: Rhino7 software arranges the transport forklifts.

[0075] In some embodiments of the present invention, as Figure 8 shown, according to the designed path of the drift, arrange the transport forklifts in different orientations to ensure that the simulation is close to the actual project.

[0076] Step 7: Use Rhino7 software to draw the alternating model of mineral veins and non-mineral veins.

[0077] In some embodiments of the present invention, Figure 9 and Figure 10 As shown, thin veins are often sandwiched between other types of rocks, forming an alternating pattern similar to "non-vein-vein-non-vein". According to the actual distribution of veins, a model of alternating veins and waste rock is drawn in Rhino7 software.

[0078] Specifically, according to the actual distribution, size and direction of the veins in the mine, the polyline tool in Rhino7 software is used to draw the vein plane line string, and the extrude closed curve command in the solid tool is used to generate an alternating model of veins and non-veins.

[0079] Step 8: Import the ore and rock model into EDEM software.

[0080] In some embodiments of the present invention, Figure 11 As shown in the figure, the basic unit of EDEM software is spherical particles, and the actual ore rock is an irregular block polyhedron. In order to generate block units of ore rock that fit the actual situation, EDEM software executes Tools-Rendering Options-Display Templates-Import command, imports the rock STL file in step 1, and generates an empty rock model.

[0081] Step 9: The EDEM software adjusts the unit particle size distribution and edge filling smoothness to generate a rock particle model.

[0082] In some embodiments of the present invention, Figure 12 and Figure 13 As shown in the figure, the STL model of mineral rock particles is a polyhedron, which is difficult to fit and fill with spherical particles of the same size. The EDEM software needs to execute the Bulk Material command to generate circular particle units, and then execute the Size Distribution command through the Size Distribution option to adjust the particle size distribution of the circular particle units, and adjust the smoothness of the rock edge filling through the Smoothing Value command, and fill and generate a rock particle solid model that conforms to the actual situation through the Generate Particle command.

[0083] The generation steps of the circular particle unit are as follows: in the Bulk Material module of the EDEM software, execute the Add BulkMaterial command, set the Material value, define the rock material parameters, execute the AddParticle - Add Multi Sphere command to generate the basic circular particle unit, and define the radius of the basic circular particle unit by modifying the Physical Radius value.

[0084] Step 10: Import the mine multi - drift ore - drawing model into the EDEM software.

[0085] In some embodiments of the present invention, as Figure 14 shown, in the Geometries module of the EDEM software, the EDEM software executes the Import Geometries command to import the mine, ore vein, waste rock, and transport forklift models generated by the Rhino7 software into the EDEM software to generate the mine, ore vein, surrounding rock, and forklift simulation models. Set the Type option of the ore vein and non - ore vein models to Virtual to form a non - collision module. Through the above steps 8 and 9, ore and rock particles are generated. The EDEM software executes the Add Equipment Material command to set the environmental material properties. Select the ore vein model and non - ore vein model in Geometries respectively, execute the Add Factory to generate a particle factory, create ore and non - ore particle units, and set the Total Number value to determine the total generation number of ore and non - ore particles.

[0086] Among them, through the Equipment Material module, execute the Add Equipment Material command to define the material parameters of the mine and rock models. By setting the Poisson's Ratio value, define the Poisson's ratio of the material; by setting the Solids Density value, define the material density value; by setting the Shear Modulus value, define the material shear modulus. Execute the Interaction command to interconnect the mine model with the rock particles. Set the Coefficient of Restitution value to define the coefficient of restitution of the model material; set the Coefficient of Static Friction value to define the coefficient of static friction of the model material; set the Coefficient of Rolling Friction value to define the coefficient of rolling friction of the model material.

[0087] Step 11: Set the motion parameters of the transport forklift and the bucket in the EDEM software.

[0088] In some embodiments of the present invention, as Figure 15 and Figure 16 shown, in the Geometries module of the EDEM software, select the transport forklift model, execute the Add Motion command, and respectively assign the forward motion, the bucket rotation and rock shoveling motion, the backward motion, and the rock unloading motion. Execute the Add Linear Translation Kinematic command to control the linear forward motion of the transport forklift; execute the Add Linear Rotation Kinematic command to control the rotation and lifting of the bucket; execute the Add Linear Translation Kinematic command to control the linear backward exit of the transport forklift from the roadway; execute the Add Linear Rotation Kinematic command to control the rotation of the bucket to unload the rock particles.

[0089] Step 12: Set the simulation parameters in the EDEM software and conduct the ore drawing simulation.

[0090] In some embodiments of the present invention, in the EDEM software Simulator module, the Time Integration option is set to Euler integration for simulation calculations. The EDEM software executes the Fixed Times Step, Total Time, and Target Save Interval commands, and the calculation step size, total simulation time value, and data recording interval can be set respectively according to the actual simulation requirements. In the EDEM software Simulator Grid module, the Cell Size is set. For example, when the cell size is set to 2.5 - 3, the total number of particle cells generated by the simulation is determined. According to the user's computer configuration, the Selected Engine and Number of CPU Cores are set in the Simulator Engine module of the EDEM software, and then the simulation starts.

[0091] Step 13: The EDEM software generates a statistical space to count the transportation conditions of each particle and automatically calculates the dilution rate.

[0092] In this step, a statistical space is defined and generated in the EDEM software to calculate the proportion of various types of particles. Through the post - processing module, the dilution rate is automatically calculated. In some embodiments of the present invention, such as Figure 20 shown, to calculate the actual proportion of ore and non - ore during the ore - drawing process, particle calculation spaces are set at the inlet respectively. When the transport forklift passes through this space, the statistical space automatically records the quantity of various types of particles. Through the EDEM post - processing module, the transportation quantity ratio of ore and non - ore is counted, and the dilution rate is automatically calculated. As Figure 21 shown, the curve in the figure represents the proportion of mine particles in the total particles transported by the bucket during the simulation period, and thus the ore - drawing dilution rate can be obtained.

[0093] The method provided by the foregoing embodiments of the present invention couples the use of Rhino7 software and EDEM software, taking the advantages of both and discarding their respective disadvantages. In the early stage, the powerful parametric modeling function of Rhino7 software is used to establish a multi-heading model of an underground mine and a loading and hauling tool model. By coupling EDEM software and setting reasonable parameters (including the rock filling smoothing value parameter, environmental material property parameter, particle generation quantity value parameter, movement speed and direction parameter of the transport loader, and the simulation parameters included in step 12, and the user needs to adjust and determine the corresponding simulation parameters according to the actual situation of their own simulation project), numerical simulation is realized, making full use of the advantages of Rhino7 in efficiently establishing a three-dimensional model and EDEM in rapid simulation calculation, fully demonstrating the powerful three-dimensional solid modeling function of Rhino7 software, improving the efficiency of discrete element simulation of EDEM software, simplifying the complicated pre-processing process, and solving the problems of ore drawing simulation and difficult calculation of dilution rate in mining engineering.

[0094] The above embodiments are preferred embodiments of the present invention, but the embodiments of the present invention are not limited to the above embodiments. Any other changes, modifications, substitutions, combinations, and simplifications made without departing from the spirit and principle of the present invention shall be equivalent replacement methods and are all included in the protection scope of the present invention.

Claims

1. A method for ore drawing simulation and dilution calculation, characterized in that It includes the following steps: Draw a 3D model of the rock in 3D design software according to the actual shape of the rock; Generate a 3D model of the mine in 3D design software, and form a multi-heading model of the mine based on the 3D model of the mine; Establish a model of a transport forklift in 3D design software, and arrange the model of the transport forklift in the multi-heading model of the mine; Establish an alternating model of ore veins and non-ore veins in 3D design software; Import the 3D rock model into EDEM software and fill it to generate a rock particle model; Import the 3D rock model, the multi-heading model of the mine, the alternating model of ore veins and non-ore veins, and the model of the transport forklift into EDEM software to generate a simulation model of the mine, ore veins, surrounding rock, and forklift; Set the action parameters of the transport forklift and the bucket in EDEM software; Conduct ore drawing simulation in EDEM software; EDEM software generates a statistical space, counts the conveying conditions of each particle, and calculates the dilution rate.

2. The ore drawing simulation and dilution calculation method according to claim 1, wherein The 3D design software is any one of Rhino7 software and Solidworks software.

3. A method for ore drawing simulation and dilution calculation according to claim 1, characterized in that, The method of generating a 3D model of the mine in the 3D design software is to import the DWG drawing of the mine plane design into the 3D design software, draw the plane contour, and then stretch the plane contour to form a solid figure to generate a 3D model of the mine.

4. A method for ore drawing simulation and dilution calculation according to claim 1, characterized in that, The method of forming a multi-heading model of the mine based on the 3D model of the mine is to perform a Boolean operation command in the 3D design software, cut the 3D model of the mine, generate an entity model of the heading and the roadway outside the vein, generate a mined-out area, and draw and generate ore veins and surrounding rock models according to the actual ore vein distribution, size, and trend to form a multi-heading model of the mine.

5. A method for ore drawing simulation and dilution calculation according to claim 1, characterized in that, When arranging the model of the transport forklift in the multi-heading model of the mine, arrange the transport forklifts in different orientations according to the designed path of the heading.

6. The ore drawing simulation and dilution calculation method according to claim 1, characterized in that, The specific steps of importing the 3D rock model into EDEM software and filling it to generate a rock particle model include: Import the 3D rock model into EDEM software to generate an empty rock model; First generate basic particle units, then adjust the particle size distribution of the basic particle units, and adjust the filling smoothness of the rock edge to fill and generate an actual rock particle solid model.

7. A method for ore drawing simulation and dilution calculation according to claim 1, characterized in that After filling and generating a rock particle model in EDEM software, set the properties of the surrounding rock. The properties include material properties, and the material properties include material Poisson's ratio, material density, and material shear modulus, and connect the mine model with the rock particles.

8. A method for ore drawing simulation and dilution calculation according to claim 1, characterized in that Among the action parameters of the transport forklift and the bucket set in EDEM software, it includes: assigning the forward movement of the forklift, the rotation and shoveling action of the bucket to shovel the rock, the backward movement of the forklift, and the unloading action of the rock.

9. A method for ore drawing simulation and dilution calculation according to any one of claims 1-8, characterized in that, When conducting ore drawing simulation in EDEM software, first set the simulation parameters. The simulation parameters include calculation step size, total simulation time, and data recording interval.

10. A method for ore drawing simulation and dilution calculation according to claim 9, characterized in that, When conducting ore drawing simulation in EDEM software, it is also necessary to set the calculation engine and the number of CPU cores in EDEM software according to the performance of the user's computer, and then conduct the simulation.

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