System and method for preparing a complex rock mass model

Abstract

This invention relates to a system and method for preparing complex rock mass models, comprising a controller and a 3D printing molding device. The 3D printing molding device includes a base plate, a first driving device for repeatedly moving the base plate along a first direction, a printing platform located below the base plate, a second driving device for repeatedly moving the printing platform along a second direction, and a fracture forming component, a powder spreading component, and an adhesive spraying component located on the base plate. The first driving device, the second driving device, the fracture forming component, the powder spreading component, and the adhesive spraying component are all electrically connected to the controller. This system automatically realizes the pre-filling of fracture filling material, the spreading of stone powder, and the bonding and molding of adhesive through the controller. Combined with the lifting and lowering movement of the printing platform, it prepares complex rock mass models through a layer-by-layer stacking method, solving the problem of preparing three-dimensional rock mass models with complex structures. It also boasts high preparation efficiency, reduced preparation costs, and high preparation accuracy.

Description

Technical Field

[0001] This invention relates to the field of rock mass model manufacturing technology, and in particular to a preparation system and method for complex rock mass models. Background Technology

[0002] Research on energy and resource development and utilization requires a deep understanding of the mechanical properties and various physical properties of underground rock reservoirs. Due to the complexity of the composition and spatial structure of underground rock reservoirs, research on their related mechanical properties and various physical properties faces significant challenges. This deficiency inevitably leads to numerous uncertainties and potential accidents during related work, greatly increasing the difficulty and danger of development efforts. Furthermore, natural rock masses contain pores and fractures, and their composition and spatial structure are highly complex. Currently, the traditional method for obtaining complex rock mass specimens is core drilling, directly obtaining rock mass samples containing natural pore structures. However, this method suffers from drawbacks such as high cost, cumbersome preparation process, low fracture reduction accuracy, and poor repeatability. Summary of the Invention

[0003] The purpose of this invention is to provide a preparation system and method for complex rock mass models, which can improve preparation efficiency, achieve high fissure reproduction, and reduce preparation cost.

[0004] To achieve the objective of this invention, the technical solution adopted is as follows:

[0005] A system for preparing a complex rock mass model includes a controller and a 3D printing molding device. The 3D printing molding device includes a base plate, a first driving device that drives the base plate to move repeatedly in a first direction, a printing platform located below the base plate, a second driving device that drives the printing platform to move repeatedly in a second direction, and a fracture forming component, a powder spreading component, and a binder spraying component located on the base plate. The first driving device, the second driving device, the fracture forming component, the powder spreading component, and the binder spraying component are all electrically connected to the controller. The first direction is arranged parallel to the horizontal plane, and the second direction is arranged perpendicular to the horizontal plane.

[0006] The fissure forming assembly includes a set of filling nozzles with openings facing one side of the printing platform, and a filling feed center that provides fissure filling material to the filling nozzles. The fissure filling material is a soluble material.

[0007] The powder spreading assembly includes at least two sets of powder spreading nozzles with openings facing the printing platform, and a stone powder feeding center corresponding to each set of powder spreading nozzles. The nozzle orifice diameter of each set of powder spreading nozzles is different.

[0008] The adhesive jetting assembly includes a set of adhesive nozzles with openings facing one side of the printing platform, and an adhesive feeding center for feeding the adhesive nozzles.

[0009] During preparation, the controller controls the second drive device to move the printing platform along the second direction to the printing position, and the controller controls the first drive device to move the base plate forward along the first direction. The controller controls the fracture forming component to work according to the fracture location information in the complex rock mass 3D model, and sprays the fracture filling material onto the corresponding position of the printing platform through the filling nozzle. Then, the first drive device drives the base plate to move in the first direction in the reverse direction, and the controller controls the powder spreading component to work according to the rock strength information of the rock mass in the rock mass 3D model slice data, and spreads stone powder of different particle sizes on the printing platform through powder spreading nozzles of different apertures. After that, the first drive device drives the base plate to move forward along the first direction, and the controller controls the adhesive spraying component to spray adhesive onto the printing platform through the adhesive nozzle, so that the fracture filling material and stone powder are bonded together. The controller controls the second drive device to move the printing platform longitudinally to the next printing position and repeats the above steps to prepare the rock mass specimen by layer stacking. Finally, the rock mass specimen is placed in a solvent corresponding to the fracture filling material, so that the fracture filling material melts and forms fractures, thus preparing the complex rock mass model. This system automatically pre-fills fissures with filling material, lays stone powder, and bonds adhesives through a controller. Combined with the lifting and lowering motion of the printing platform, it creates complex rock mass models through a layer-by-layer stacking process. This solves the problem of preparing three-dimensional rock mass models with complex structures, offering high efficiency and reduced costs. Furthermore, the fissure filling material pre-fills fissures based on the rock mass model data. Being soluble, the material dissolves readily in appropriate solvents, accurately reproducing the internal fissure structure of complex rock masses. The powder-laying component offers stone powder of various particle sizes. By controlling the output of different particle sizes, different combinations of stone powders can be created, enabling the printing of complex internal fissures and varying rock strengths, further improving the accuracy of the preparation.

[0010] The technical solution is further explained below:

[0011] Furthermore, each group of powder-spreading nozzles is equipped with at least two rows of multiple powder-spreading nozzles arranged at intervals along a third direction. The powder-spreading nozzles in each adjacent two rows are staggered, and the third direction is arranged parallel to the horizontal plane and perpendicular to the first direction. The staggered arrangement of the nozzles in rows ensures full coverage of the printing platform and further improves the preparation efficiency and accuracy.

[0012] Furthermore, the powder spreading assembly includes three sets of powder spreading nozzles arranged side by side. The nozzle orifice diameter of each set of powder spreading nozzles increases or decreases sequentially along the first direction. The three different sizes of stone powders are combined and adjusted to create more diverse combinations of stone powders, making the preparation system adaptable to printing on rocks of varying strengths, resulting in more flexible preparation and better precision.

[0013] Furthermore, the powder spreading assembly also includes a powder spreading hopper corresponding to each set of powder spreading nozzles. The stone powder supply center includes a stone powder hopper corresponding to each powder spreading hopper, a stone powder supply pipe with both ends connected to the corresponding stone powder hopper and the powder spreading hopper, and a first drive pump corresponding to each stone powder hopper. The first drive pump is electrically connected to the controller. The fissure forming assembly also includes a filling hopper connected to the filling nozzle. The filling supply center includes a filling hopper, a filling supply pipe with both ends connected to the corresponding filling hopper and the filling hopper, and a second drive pump for conveying fissure filling material from the filling hopper to the filling hopper. The second drive pump is electrically connected to the controller. The adhesive spraying assembly also includes an adhesive hopper connected to the adhesive nozzle. The adhesive supply center includes an adhesive hopper, an adhesive supply pipe with both ends connected to the corresponding adhesive hopper and the adhesive hopper, and a third drive pump for conveying adhesive from the adhesive hopper to the adhesive hopper. The third drive pump is electrically connected to the controller. The controller controls the operation of the crack forming component, powder spreading component, and adhesive spraying component by driving the first drive pump, the second drive pump, and the third drive pump, respectively, thereby further improving work efficiency.

[0014] Furthermore, the filling nozzle, powder spreading nozzle, and binder nozzle are all rotatably connected to the base plate. The 3D printing device also includes a third drive device for driving the rotation of the filling nozzle and controlling its rotation angle, a fourth drive device for driving the rotation of the powder spreading nozzle and controlling its rotation angle, and a fifth drive device for driving the rotation of the binder nozzle and controlling its rotation angle. The third, fourth, and fifth drive devices are all electrically connected to the controller. Because the filling nozzle, powder spreading nozzle, and binder nozzle are all rotatably connected to the base plate, during operation, the rotation angles of the filling nozzle, powder spreading nozzle, and binder nozzle can be adjusted to achieve a wider printing coverage and higher precision. This allows for the creation of more complex rock mass models with greater difficulty, further improving the adaptability and manufacturing accuracy of the system.

[0015] Furthermore, the 3D printing molding device also includes a rolling pressure bar located on the side of the base plate facing the printing platform. The rolling pressure bar is rotatably connected to the base plate and is located on the side of the powder spreading nozzle facing away from the powder spreading direction. By rolling the pressure bar, the fissure filling material and stone powder are compacted and flattened, resulting in a better and more accurate rock mass model.

[0016] Furthermore, the 3D printing apparatus also includes a heating element electrically connected to the controller, located on the side of the base plate facing the printing platform. The heating element heats the adhesive laid on the fissure-filling material and powder material, causing the adhesive to cross-link and cure, further improving the manufacturing efficiency.

[0017] Furthermore, the fracture forming component, rolling pressure bar, powder spreading component, adhesive spraying component, and heating pipe are arranged side-by-side on the base plate along the first direction. By controlling the base plate, the movement trajectory of the fracture forming component, rolling pressure bar, powder spreading component, adhesive spraying component, and heating pipe can be controlled, making control more convenient and the system structure simpler.

[0018] Furthermore, the 3D printing molding device also includes a frame, a transverse slide rail and a lifting guide rail mounted on the frame. The transverse slide rail is arranged along a first direction, and the base plate is slidably connected to the transverse slide rail. The lifting guide rail is arranged along a second direction, and the printing platform is slidably connected to the lifting guide rail. By slidably connecting the transverse slide rail and the lifting guide rail to the base plate and the printing platform respectively, the sliding of the base plate and the printing platform is more stable and the control precision is higher.

[0019] This invention also provides a method for preparing a complex rock mass model, comprising the following steps:

[0020] A. The controller acquires slice data information of the three-dimensional model of the rock mass;

[0021] B. The controller moves the printing platform longitudinally to the printing position;

[0022] C. Based on the location information of the fractures in the three-dimensional model of the complex rock mass, the controller controls the 3D printing molding device to move laterally from the starting position to the ending position. The 3D printing molding device sprays the fracture filling powder to the corresponding position of the printing platform. The fracture filling powder is a soluble material.

[0023] D. Based on the rock strength information of the rock mass in the three-dimensional model slice data of the rock mass, the controller controls the 3D printing molding device to move laterally from the end position to the starting position. The 3D printing molding device lays stone powder of different particle sizes on the printing platform and rolls the crack filling powder and stone powder flat by rolling pressure bar.

[0024] E. The controller controls the 3D printing molding device to move laterally from the starting position to the ending position. The 3D printing molding device sprays adhesive onto the printing platform to bond the gap filling material and stone powder together to form the shape.

[0025] F. The controller controls the 3D printing molding device to move laterally from the end position to the starting position, and the controller controls the heating tube to heat the adhesive, so that the adhesive is heated and cross-linked and cured.

[0026] G. The controller controls the printing platform to move longitudinally to the next printing position and repeats steps C to F above to prepare rock mass specimens by layer stacking.

[0027] H. After the rock mass specimen is treated with high temperature, it is placed in a solvent corresponding to the fracture filling powder. The fracture filling powder in the rock mass specimen melts, causing the fracture filling powder to fill the location and form a gap, thus preparing a complex rock mass model.

[0028] This method automatically realizes the pre-filling of fissure-filling powder, the laying of stone powder, and the bonding and molding of adhesive through a controller. In conjunction with the lifting and lowering movement of the printing platform, it prepares complex rock mass models through a layer-by-layer stacking method, which has high preparation efficiency and reduces preparation costs. In addition, the fissure-filling powder is pre-filled with fissures according to the data information of the rock mass model. The fissure-filling powder is soluble and can be fully dissolved in the corresponding solvent, which can accurately reproduce the internal fissure structure of complex rock masses. Furthermore, the 3D printing molding device controls the output of stone powder of different particle sizes to mix different stone powder combinations, which can adapt to the printing of different rock strengths and further improve the preparation accuracy.

[0029] Compared with the prior art, the present invention has the following beneficial effects:

[0030] This system and method automatically realizes the pre-filling of fissure-filling powder, the laying of stone powder, and the bonding and molding of adhesive through a controller. In conjunction with the lifting and lowering movement of the printing platform, it prepares complex rock mass models through a layer-by-layer stacking method, which has high preparation efficiency and reduces preparation costs. In addition, the fissure-filling powder is pre-filled with fissures according to the data information of the rock mass model. The fissure-filling powder is soluble and can be fully dissolved in the corresponding solvent, which can accurately reproduce the internal fissure structure of complex rock masses. Furthermore, the 3D printing molding device controls the output of stone powder of different particle sizes to mix different stone powder combinations, which can adapt to the printing of different rock strengths and further improve the preparation accuracy. Attached Figure Description

[0031] Figure 1 This is a schematic diagram of the structure of the complex rock mass model preparation system according to an embodiment of the present invention;

[0032] Figure 2 This is a structural layout diagram of the base plate and printing assembly according to an embodiment of the present invention;

[0033] Figure 3 This is a structural diagram of the base plate according to an embodiment of the present invention;

[0034] Figure 4 for Figure 3 A schematic diagram of direction A.

[0035] Explanation of reference numerals in the attached figures:

[0036] 10. Controller; 20. 3D Printing Unit; 210. Frame; 220. Lateral Slide Rail; 230. Lifting Guide Rail; 240. Base Plate; 250. Printing Platform; 261. Horizontal Stepper Motor; 262. Synchronous Drive Belt; 263. First Pulley; 264. Second Pulley; 271. Lifting Motor; 272. Drive Screw; 280. Printing Component; 281. Fissure Forming Component; 2811. Filling Nozzle; 2812. Filling Hopper; 2813. Filling Bucket; 2814. Filling Supply Pipe; 2815. 282. Second drive pump, 2821. Powder spreading assembly, 2822. Powder spreading nozzle, 2823. Powder spreading silo, 2824. Stone powder hopper, 2825. Stone powder supply pipe, 2826. First drive pump, 283. Rolling pressure bar, 284. Adhesive spraying assembly, 2841. Adhesive nozzle, 2842. Adhesive silo, 2843. Adhesive hopper, 2844. Adhesive supply pipe, 2845. Third drive pump, 285. Heating pipe, 286. Third drive device, 287. Fourth drive device, 288. Fifth drive device. Detailed Implementation

[0037] 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.

[0038] It should be noted that when a component is described as "fixed to" another component, it can be directly on the other component or may have a component in between. When a component is considered to be "connected to" another component, it can be directly connected to the other component or may have a component in between. When a component is considered to be "set on" or "placed on" another component, it can be directly set on the other component or may have a component in between. The terms "vertical," "horizontal," "left," "right," and similar expressions used in this document are for illustrative purposes only.

[0039] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0040] like Figures 1 to 4As shown, a complex rock mass model preparation system includes a controller 10 and a 3D printing molding device 20. The 3D printing molding device 20 includes a frame 210, a transverse slide rail 220 and a lifting guide rail 230 disposed on the frame 210, a base plate 240 slidably connected to the transverse slide rail 220, a printing platform 250 slidably connected to the lifting guide rail 230 and located below the base plate 240, a first driving device for driving the base plate 240 to move repeatedly along the transverse slide rail 220, a second driving device for driving the printing platform 250 to move repeatedly along the lifting guide rail 230, and a printing assembly 280 disposed on the base plate 240. The printing assembly 280 includes a fracture forming assembly 281, a powder spreading assembly 282, a rolling pressure bar 283, a binder spraying assembly 284, and a heating pipe 285. The first driving device, the second driving device, the fracture forming assembly 281, the powder spreading assembly 282, the binder spraying assembly 284, and the heating pipe 285 are all electrically connected to the controller 10.

[0041] In this embodiment, the first driving device includes a horizontal stepper motor 261, a synchronous transmission belt 262, and a first pulley 263 and a second pulley 264 respectively fixed to the base plate 240 and the upright. The first pulley 263 and the second pulley 264 are connected to the horizontal stepper motor 261 via the synchronous transmission belt 262. The horizontal stepper motor 261 drives the first pulley 263 through the pulleys, realizing the repetitive movement of the base plate 240 on the horizontal slide rail 220. The second driving device includes a lifting motor 271 and a transmission screw 272. The transmission screw 272 is connected to the lifting platform. The lifting motor 271 drives the printing platform 250 to slide on the lifting guide rail 230 through the transmission screw 272. The first and second driving devices can also adopt other driving methods according to actual needs.

[0042] like Figure 1 and Figure 4 As shown, the crack forming component 281, rolling pressure bar 283, powder spreading component 282, adhesive spraying component 284, and heating pipe 285 are all fixed on the base plate 240. By controlling the base plate 240, the movement trajectory control of the crack forming component 281, rolling pressure bar 283, powder spreading component 282, adhesive spraying component 284, and heating pipe 285 can be achieved, making control more convenient and the system structure simpler.

[0043] In this embodiment, the crack forming component 281, rolling pressure bar 283, powder spreading component 282, adhesive spraying component 284, and heating pipe 285 are arranged side by side along the transverse slide rail 220, making the system control simpler. The relative positions of the crack forming component 281, rolling pressure bar 283, powder spreading component 282, adhesive spraying component 284, and heating pipe 285 can also be configured in other ways according to actual needs.

[0044] like Figures 1 to 4 As shown, the fissure forming assembly 281 includes a set of filling nozzles 2811 with openings facing the printing platform 250, a filling hopper 2812 communicating with the filling nozzles 2811, and a filling supply center for providing fissure filling material to the filling nozzles 2811. The filling supply center includes a filling tank 2813, a filling supply pipe 2814 with both ends communicating with the corresponding filling tank 2813 and the filling hopper 2812, and a second drive pump 2815 for feeding the fissure filling material from the filling tank 2813 to the filling hopper 2812. The second drive pump 2815 is electrically connected to the controller 10, and the fissure filling material is a soluble material.

[0045] The controller 10 controls the fracture forming component 281 to work according to the location information of the fractures in the three-dimensional model of the complex rock mass, and sprays the fracture filling material to the corresponding position of the printing platform 250 through the filling nozzle 2811, so that the fracture filling material pre-fills the fractures. Since the fracture filling material is soluble, it can be fully dissolved in the corresponding solvent, so the internal fracture structure of the complex rock mass can be restored with high precision.

[0046] In this embodiment, as Figure 4 As shown, the crack forming component 281 is provided with two rows of staggered filling nozzles 2811. The arrangement direction of each row of filling nozzles 2811 is perpendicular to the horizontal slide rail 220 to ensure full coverage of the printing area. The filling nozzles 2811 can also be set in one or more rows as needed.

[0047] In this embodiment, the crack filling material is sodium carbonate powder with a particle size of less than 0.1 mm. The sodium carbonate powder has the highest solubility in water at 35°C. Other soluble materials can also be used as crack filling materials according to actual needs, and the particle size can also be set to other sizes.

[0048] like Figures 1 to 4 As shown, the powder spreading assembly 282 includes at least two sets of powder spreading nozzles 2821 with openings facing the printing platform 250, a powder spreading hopper 2822 corresponding to each set of powder spreading nozzles 2821, and a stone powder supply center corresponding to each set of powder spreading nozzles 2821. The stone powder supply center includes a stone powder bucket 2823 corresponding to each set of powder spreading hoppers 2822, a stone powder supply pipe 2824 with both ends connected to the corresponding stone powder bucket 2823 and the powder spreading hopper 2822 respectively, and a first drive pump 2825 corresponding to each set of stone powder buckets 2823. The first drive pump 2825 is electrically connected to the controller 10, and the nozzle orifice diameter corresponding to each set of powder spreading nozzles 2821 is different.

[0049] The controller 10 controls the operation of the powder spreading component 282 based on the rock strength information of the rock mass in the three-dimensional model slice data. The powder spreading component 282 spreads stone powder of different particle sizes on the printing platform 250 through the powder spreading nozzles 2821 with different apertures. The powder spreading component 282 is equipped with stone powder of various particle sizes. By controlling the output amount of stone powder of different particle sizes, different combinations of stone powder are mixed to adapt to the printing of different rock strengths and further improve the preparation accuracy of the rock mass.

[0050] In this embodiment, as Figures 2 to 4 As shown, the powder spreading assembly 282 is equipped with three sets of powder spreading nozzles 2821 arranged side by side. The nozzle orifice diameter of each set of powder spreading nozzles 2821 decreases sequentially along the powder spreading direction. Each set of powder spreading nozzles 2821 has two rows of staggered powder spreading nozzles 2821, and the arrangement direction of each row of powder spreading nozzles 2821 is perpendicular to the transverse slide rail 220. The staggered arrangement of the nozzles ensures full coverage of the printing platform 250 and further improves the preparation efficiency and accuracy. Moreover, the three different sizes of stone powder can be mixed and adjusted to create more different combinations of stone powder, making the preparation system adaptable to printing on rocks with different strengths, resulting in more flexible preparation and better accuracy. The powder spreading component 282 can also be equipped with two or more sets of powder spreading nozzles 2821 with different nozzle orifice diameters according to actual needs. The nozzle orifice diameter of each set of powder spreading nozzles 2821 can be increased sequentially along the powder spreading direction or it does not need to be arranged in a sequentially increasing or decreasing manner. Each set of powder spreading nozzles 2821 can be set with one or more rows according to actual needs.

[0051] In this embodiment, the stone material is quartz sand powder. Three types of quartz sand powder with different particle sizes are quartz powder with a particle size less than 0.1 mm, quartz sand with a particle size of 0.15 mm-0.3 mm, and coarse sand with a particle size of 0.212 mm-0.425 mm, and are respectively stored in three different stone powder containers 2823. The stone powder can also be set to other sizes according to actual needs.

[0052] like Figure 4 As shown, the rolling pressure rod 283 is rotatably connected to the base plate 240. The rolling pressure rod 283 is located on the side of the powder spreading nozzle 2821 facing away from the powder spreading direction. The rolling pressure rod 283 is used to roll the crack filling material and stone powder flat, so that the prepared rock mass model has a better effect and higher precision.

[0053] like Figures 1 to 4As shown, the adhesive spraying assembly 284 includes a set of adhesive nozzles 2841 with openings facing the printing platform 250, an adhesive hopper 2842 communicating with the adhesive nozzles 2841, and an adhesive supply center for supplying adhesive to the adhesive nozzles 2841. The adhesive supply center includes an adhesive tank 2843, adhesive supply pipes 2844 with both ends communicating with the corresponding adhesive tanks 2843 and adhesive hoppers 2842, and a third drive pump 2845 for delivering adhesive from the adhesive tanks 2843 to the adhesive hoppers 2842. The third drive pump 2845 is electrically connected to the controller 10. The controller 10 controls the adhesive spraying assembly 284 and sprays adhesive through the adhesive nozzles 2841 onto the surface of the compacted and leveled gap filler material and stone powder, causing the gap filler material and stone powder to bond and form a shape.

[0054] In this embodiment, as Figure 4 As shown, the adhesive spraying assembly 284 is provided with two rows of staggered adhesive nozzles 2841. The arrangement direction of each row of adhesive nozzles 2841 is perpendicular to the horizontal slide rail 220 to ensure full coverage of the printing area. The adhesive nozzles 2841 can also be set in one or more rows as needed.

[0055] In this embodiment, the adhesive is furan resin, a thermosetting resin that can cross-link and cure upon heating without the need for a curing agent. If an acidic catalytic curing agent is introduced, it can rapidly cross-link and cure at room temperature without heating. Other adhesive materials can also be used as needed.

[0056] like Figure 4 As shown, the heating tube 285 is located on the side of the base plate 240 facing the printing platform 250. The adhesive is heated by the heating tube 285, causing it to cross-link and cure, further improving the preparation efficiency. If an acidic catalytic curing agent is introduced into the adhesive, the heating tube 285 is not required.

[0057] In this embodiment, the heating tube 285 is an infrared heating lamp tube, and the heating tube 285 can also adopt other heating methods according to actual needs.

[0058] To achieve wider printing coverage, such as Figure 4As shown, the filling nozzle 2811, powder spreading nozzle 2821, and adhesive nozzle 2841 are all connected to their corresponding material bins and are rotatably connected. The printing assembly 280 also includes a third drive device 286 for driving the rotation of the filling nozzle 2811 and controlling its rotation angle, a fourth drive device 287 for driving the rotation of the powder spreading nozzle 2821 and controlling its rotation angle, and a fifth drive device 288 for driving the rotation of the adhesive nozzle 2841 and controlling its rotation angle. The third drive device 286, the fourth drive device 287, and the fifth drive device 288 are all electrically connected to the controller 10. The filling nozzle 2811, the powder spreading nozzle 2821, and the adhesive nozzle 2841 are all rotatably connected to the base plate 240. During operation, by adjusting the rotation angle of the filling nozzle 2811, the powder spreading nozzle 2821, and the adhesive nozzle 2841, the printing coverage area can be wider and the accuracy higher, enabling the production of more complex rock mass models with greater difficulty, further improving the adaptability and preparation accuracy of the preparation system.

[0059] This invention also provides a method for preparing a complex rock mass model, comprising the following steps:

[0060] A. Controller 10 acquires rock mass three-dimensional model slice data information;

[0061] In this embodiment, CT scanning technology is used to obtain three-dimensional model slice data of rock mass. This preparation method can also use other methods to obtain three-dimensional model slice data of rock mass according to actual needs.

[0062] B. The controller 10 controls the printing platform 250 to move longitudinally along the lifting guide rail 230 to the printing position;

[0063] C. Based on the location information of the cracks in the complex rock mass three-dimensional model, the controller 10 controls the base plate 240 to move laterally from the starting position to the ending position along the transverse slide rail 220, and causes the crack forming component 281 on the base plate 240 to spray crack filling powder to the corresponding position of the printing platform 250.

[0064] D. Based on the rock strength information of the rock mass in the three-dimensional model slice data, the controller 10 controls the base plate 240 to move laterally from the end position to the starting position along the transverse slide rail 220, and makes the powder spreading component 282 on the base plate 240 spread stone powder of different particle sizes on the printing platform 250, and rolls the crack filling powder and stone powder flat by the rolling pressure bar 283.

[0065] E. The controller 10 controls the base plate 240 to move laterally from the starting position to the ending position along the transverse slide rail 220, and causes the 3D printing molding device 20 on the base plate 240 to spray adhesive onto the printing platform 250, so that the gap filling material and stone powder are bonded together.

[0066] F. The controller 10 controls the base plate 240 to move laterally from the end position to the starting position along the transverse slide rail 220, so that the heating tube 285 heats the adhesive, causing the adhesive to cross-link and cure by heat.

[0067] G. The controller 10 controls the printing platform 250 to move longitudinally to the next printing position and repeats the above steps C to F to prepare the rock mass specimen by layer stacking.

[0068] H. After the rock mass specimen is treated with high temperature, it is placed in a solvent corresponding to the fracture filling powder. The fracture filling powder in the rock mass specimen melts, causing the fracture filling powder to fill the location and form a gap, thus preparing a complex rock mass model.

[0069] In this embodiment, the fissure filling powder is sodium carbonate powder. After the rock mass specimen is treated with high temperature, it is placed in water at 35°C for constant temperature curing, so that the sodium carbonate powder filling the rock mass specimen dissolves in the water. After the sodium carbonate powder in the fissure is fully dissolved in the water, the rock mass specimen is taken out, and after draining the water, a complex rock mass model specimen with high precision is finally obtained.

[0070] This preparation system and method automatically realizes the pre-filling of fissure filling material, the laying of stone powder, and the bonding and molding of adhesive through the controller 10. In conjunction with the lifting and lowering movement of the printing platform 250, a complex rock mass model is prepared by layer-by-layer laying and stacking. This solves the problem of preparing three-dimensional rock mass models with complex structures, and has high preparation efficiency and reduced preparation costs. In addition, the fissure filling material is pre-filled with fissures according to the rock mass model data information. The fissure filling material is soluble and can be fully dissolved in the corresponding solvent, which can accurately reproduce the internal fissure structure of complex rock masses. Furthermore, the powder laying component 282 is equipped with stone powder of various particle sizes. By controlling the output amount of stone powder of different particle sizes, different combinations of stone powders can be mixed to realize the printing of complex internal fissures and different rock strengths, which further improves the preparation accuracy.

[0071] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0072] The embodiments described above are merely illustrative of several implementations of the present invention, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the invention patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these all fall within the protection scope of the present invention. Therefore, the protection scope of this invention patent should be determined by the appended claims.

Claims

1. A system for preparing a complex rock mass model, characterized by, The 3D printing forming device comprises a base plate, a first driving device for driving the base plate to move repeatedly along a first direction, a printing platform arranged below the base plate, a second driving device for driving the printing platform to move repeatedly along a second direction, and a crack forming assembly, a powder spreading assembly and an adhesive spraying assembly arranged on the base plate, wherein the first driving device, the second driving device, the crack forming assembly, the powder spreading assembly and the adhesive spraying assembly are electrically connected with the controller, the first direction is parallel to the horizontal plane, and the second direction is perpendicular to the horizontal plane. The crack forming assembly comprises a group of filling nozzles with openings facing one side of the printing platform, and a filling supply center for providing the filling nozzles with crack filling materials, wherein the crack filling materials are soluble materials. The powder spreading assembly comprises at least two groups of powder spreading nozzles with openings facing one side of the printing platform, and a stone powder supply center corresponding to each group of powder spreading nozzles, wherein the nozzle aperture of each group of powder spreading nozzles is different. The adhesive spraying assembly comprises a group of adhesive nozzles with openings facing one side of the printing platform, and an adhesive supply center for supplying the adhesive nozzles. The filling nozzles, the powder spreading nozzles and the adhesive nozzles are rotatably connected with the base plate, and the 3D printing forming device further comprises a third driving device for driving the filling nozzles to rotate and controlling the rotation angle thereof, a fourth driving device for driving the powder spreading nozzles to rotate and controlling the rotation angle thereof, and a fifth driving device for driving the adhesive nozzles to rotate and controlling the rotation angle thereof, wherein the third driving device, the fourth driving device and the fifth driving device are electrically connected with the controller; the 3D printing forming device further comprises a rolling pressure rod arranged on the side of the base plate facing the printing platform, wherein the rolling pressure rod is rotatably connected with the base plate, and the rolling pressure rod is located on the side of the powder spreading nozzles facing away from the powder spreading direction.

2. The system for preparing a complex rock mass model according to claim 1, characterized in that, Each group of powder spreading nozzles is provided with a plurality of powder spreading nozzles arranged in at least two rows along a third direction, and the powder spreading nozzles of each adjacent two rows are staggered.

3. The system for preparing a complex rock mass model according to claim 2, characterized in that, The powder spreading assembly comprises three groups of powder spreading nozzles arranged side by side, and the nozzle aperture of each group of powder spreading nozzles increases or decreases in turn along the first direction.

4. The system for preparing a complex rock mass model according to claim 3, characterized in that, The powder spreading assembly further comprises a powder bin corresponding to each group of powder spreading nozzles, the stone powder supply center comprises a stone powder bin corresponding to the powder bin, a stone powder supply pipe with two ends respectively communicating with the corresponding stone powder bin and the powder bin, and a first driving pump corresponding to the stone powder bin, wherein the first driving pump is electrically connected with the controller. The crack forming assembly further comprises a filling bin in communication with the filling nozzle, the filling supply center comprises a filling material barrel, a filling supply pipe in communication with the corresponding filling material barrel and filling bin at both ends, and a second driving pump for sending the crack filling material from the filling material barrel to the filling bin, and the second driving pump is electrically connected with the controller; The adhesive spraying assembly further comprises an adhesive bin in communication with the adhesive nozzle, the adhesive supply center comprises an adhesive material barrel, an adhesive supply pipe in communication with the corresponding adhesive material barrel and adhesive bin at both ends, and a third driving pump for sending the adhesive from the adhesive material barrel to the adhesive bin, and the third driving pump is electrically connected with the controller.

5. The system for preparing a complex rock mass model according to claim 1, characterized in that, The 3D printing forming device further comprises a heating pipe electrically connected with the controller, and the heating pipe is arranged on the side of the base plate facing the printing platform.

6. The system for preparing a complex rock mass model according to claim 5, characterized in that, The crack forming assembly, the rolling pressure rod, the powder laying assembly, the adhesive spraying assembly and the heating pipe are arranged in sequence and side by side on the base plate along the first direction.

7. The system for preparing a complex rock mass model according to claim 5 or 6, characterized in that, The 3D printing forming device further comprises a rack, a transverse sliding rail and a lifting guide rail arranged on the rack, the transverse sliding rail is arranged along the first direction, the base plate is in sliding connection with the transverse sliding rail, and the lifting guide rail is arranged along the second direction, and the printing platform is in sliding connection with the lifting guide rail.

8. A method of preparing a complex rock mass model, characterized by, The method comprises the following steps: A. The controller obtains the slice data information of the rock mass three-dimensional model; B. The controller controls the printing platform to move longitudinally to a printing position; C. According to the position information of the cracks in the complex rock mass three-dimensional model, the controller controls the 3D printing forming device to move transversely from a starting position to an ending position, the 3D printing forming device sprays crack filling powder to the corresponding position of the printing platform, and the crack filling powder is a soluble material; D. According to the rock strength information of the rock mass in the slice data of the rock mass three-dimensional model, the controller controls the 3D printing forming device to move transversely from the ending position to the starting position, the 3D printing forming device lays stone powder with different particle sizes on the printing platform, and rolls and flattens the crack filling powder and the stone powder through the rolling pressure rod; E. The controller controls the 3D printing forming device to move transversely from the starting position to the ending position, and the 3D printing forming device sprays adhesive to the printing platform to bond and form the crack filling powder and the stone powder; F. The controller controls the 3D printing forming device to move transversely from the ending position to the starting position, and the controller controls the heating pipe to heat the adhesive, so that the adhesive is crosslinked and solidified by heat; G. The controller controls the printing platform to move longitudinally to the next printing position, and repeats the above steps C to F to prepare a rock mass test piece by layer-by-layer stacking. H, the rock mass test piece is placed in a solvent corresponding to the crack filling powder after high temperature treatment, the crack filling powder in the rock mass test piece melts, so that the crack filling powder filling position forms a gap, and a complex rock mass model is prepared.

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