A variable gradient printing system for engineering geological models

Abstract

The present invention discloses a variable gradient printing system for engineering geological models in the technical field of printing systems, comprising a support seat, a plurality of conveying screws are arranged on the top of the support seat, and a motor is arranged on the top surface of each conveying screw, an output shaft of the motor rotates and penetrates into the interior of the conveying screw and is fixed with an extrusion rod, a feed port is fixed through the side of the conveying screw, a fixing flange is fixed at the lower part of the conveying screw, and a fixing screw is inserted into the fixing flange, and through a controllable groove, an operator can install a corresponding number of conveying screws according to the type of material required for printing during use, thereby greatly improving the applicable scope of the printing system, and cooperates with a static mixer at the bottom to quickly mix a variety of materials to ensure the simulation effect during printing, and the interior of the groove where the conveying screw is not installed is sealed by a sealing plug to ensure the cleanliness of the diversion branch during use and prevent impurities from entering.

Description

Technical Field

[0001] The invention relates to the technical field of printing systems, and in particular to a variable gradient printing system for engineering geological models. Background Art

[0002] The engineering geological model is a summary or simplification of the engineering geological body based on the comprehensive analysis of engineering geological conditions, such as the understanding of reservoir-induced earthquake-controlling faults, geological boundary conditions, the combined characteristics of hydrogeological conditions, the hazard zoning of faults and the judgment of possible epicenters. The large-scale reduction model provides a controllable quantitative analysis method for reproducing engineering geomechanical destruction phenomena.

[0003] At present, there are miniature display models of volcanoes and landforms made by additive manufacturing, but there are few models designed for geological disaster research. Most of them are processed by additive manufacturing to make plastic molds, and then reproduce the physical model of the surface morphology of the rock joint surface accurately to improve the accuracy of the simulation of the mechanical failure morphology of the shear fracture surface. However, the layered compaction forming method is difficult to control the pore structure of the rock-soil mixture, so it is impossible to simulate the performance changes during the failure evolution process. Therefore, it is difficult to simulate the microstructure and structural stress changes and shear failure of the material before and after the evolution of the engineering geological model using traditional models, especially the stress change law before and after water seepage. Based on this, the present invention designs a variable gradient printing system for engineering geological models to solve the above problems. Summary of the invention

[0004] The purpose of the present invention is to provide a variable gradient printing system for engineering geological models to solve the problem that the traditional model proposed in the above background technology is difficult to simulate the microstructure and structural stress changes and shear failure of materials before and after the evolution of the engineering geological model, especially the stress change law before and after water seepage.

[0005] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a variable gradient printing system for engineering geological models, comprising a support seat, a plurality of conveying screws are arranged on the top of the support seat, and a motor is arranged on the top surface of each conveying screw, the output shaft of the motor rotates and penetrates into the conveying screw and is fixed with an extrusion rod, a feed port is fixed through the side of the conveying screw, a fixing flange is fixed at the lower part of the conveying screw, and a fixing screw is inserted into the fixing flange, the bottom surface of each fixing screw is fixed to the top surface of the support seat, a nut is threadedly sleeved on the fixing screw on the top surface of the fixing flange, and mounting side plates are fixed on both sides of the support seat;

[0006] A guide branch channel cooperating with the conveying screw is provided inside the support seat, and a drainage main channel is provided inside the support seat at the bottom of the guide branch channel. A static mixer is arranged at the bottom of the support seat, and the top input end of the static mixer is through-connected with the drainage main channel. A mixing nozzle is detachably installed at the bottom output end of the static mixer.

[0007] Preferably, a second motor is provided on the outer surface of the lower part of the support seat, and the output shafts of the second motor rotate and penetrate into the interior of the support seat, a control valve plate is rotatably provided at the lower part of each of the diversion branches, a rotating connecting rod is fixed at one end of each of the second motors extending into the interior of the support seat, and the end of the rotating connecting rod away from the second motor is fixed on the side surface of the control valve plate.

[0008] Preferably, the lower portion of each of the diversion branches is configured to be bent toward the main drainage channel, and the top of each of the diversion branches is provided with a groove that cooperates with the conveying screw, and the height of the groove is equal to the height between the fixed flange and the bottom surface of the conveying screw, and the diameter of the diversion branch is larger than the inner ring diameter of the conveying screw.

[0009] Preferably, a sealing groove 1 is formed on the bottom surface of each conveying screw, and a sealing ring 1 inserted in the sealing groove 1 is fixed inside each groove, and the sealing ring 1 and the sealing groove 1 are both configured to be in a matching ring shape.

[0010] Preferably, a pull ring is inserted into the groove at the top of each guide branch channel, and a sealing plug is fixed in the middle of the top surface of the pull ring, and the thickness of the sealing plug is equal to the thickness between the sealing ring and the top surface of the support seat.

[0011] Preferably, a fixed spiral tube is fixedly sleeved on the outer surface of the lower portion of the static mixer, and a fixed sleeve is threadedly sleeved on the outer side of the fixed spiral tube, the fixed sleeve is movably sleeved on the outer surface of the mixing nozzle, a limiting ring plate is fixed on the outer surface of the top of the mixing nozzle, a sealing ring 2 is fixed on the lower portion of the static mixer, and a sealing groove 2 cooperating with the sealing ring 2 is opened on the top surface of the mixing nozzle.

[0012] Preferably, the limiting ring plate is arranged in a ring shape which cooperates with the mixing nozzle, a sliding hole which cooperates with the mixing nozzle is opened at the lower part of the fixed sleeve, and the diameter of the sliding hole is smaller than the diameter of the limiting ring plate, and the inner wall of the fixed sleeve and the outer surface of the fixed spiral tube are provided with mutually cooperating threads.

[0013] Preferably, each edge of the control valve plate is configured to be semicircular, and the outer surface of the control valve plate is slidably fitted with the inner wall of the guide branch channel, the outer surface of each rotating connecting rod is glued and fixed with a sealing rubber plug ring, and the inside of the support seat on the outside of each guide branch channel is provided with a rotating hole that cooperates with the sealing rubber plug ring and the rotating connecting rod.

[0014] Preferably, a variable gradient printing system for an engineering geological model, the variable gradient printing method comprising the following steps:

[0015] (1) Realize the overall gradient from material 1 to material 2, the position fraction changes from 0 to 1, and the volume fraction changes from 0.05 to 0.95;

[0016] (2) Realize the gradient change from material 1 to material 2 and then to material 1. The position fraction changes from 0 to 0.5, the volume fraction changes from 0.05 to 0.95, the position fraction changes from 0.5 to 1, and the volume fraction changes from 0.95 to 0.05;

[0017] (3) Realize the gradient from material 2 to material 1 and then to material 2. The position fraction changes from 0 to 0.5, the volume fraction changes from 0.95 to 0.05, the position fraction changes from 0.5 to 1, and the volume fraction changes from 0.05 to 0.95;

[0018] (4) Realize the variable gradient from material 2 to material 1 and then to material 2 to material 1. The position fraction changes from 0 to 0.25, and the volume fraction changes from 0.95 to 0.95. The position fraction changes from 0.25 to 0.5, and the volume fraction changes from 0.05 to 0.05. The position fraction changes from 0.5 to 0.95, and the volume fraction changes from 0.05 to 0.95.

[0019] Preferably, when the system is printing in step 1, the XYZ axis direction model is defined to be consistent with the three-axis printing direction of the printer, wherein the X-axis and Y-axis planes are parallel to the printing platform, and the Z-axis direction is the printing layer height direction.

[0020] Compared with the prior art, the present invention has the following beneficial effects:

[0021] The present invention uses a controllable groove, and the operator can install a corresponding number of conveying screws according to the type of material required for printing, which greatly improves the application range of the printing system. In conjunction with the static mixer at the bottom, multiple materials can be quickly mixed to ensure the simulation effect during printing. The interior of the groove where the conveying screw is not installed is sealed by a sealing plug to ensure the cleanliness of the diversion branch when in use and prevent impurities from entering.

[0022] Through the detachable design of the mixing nozzle and the static mixer, when the internal static mixer or the mixing nozzle is damaged, the mixing nozzle can be quickly detached, and the mixing nozzle and the static mixer can be maintained separately. The control valves on both sides can control the flow to coordinate with the printing progress.

[0023] The twin-screw extrusion injection system with precise temperature control and mixed feeding of two-component powder and wax can effectively alleviate the micro-splitting problem faced in stone-soil-wax forming to meet the requirements of material gradient forming. The two powders are mixed online through the two-component distribution system and formed into a mixed slurry with the heated and melted wax in the twin-screw extruder. After injection, it solidifies and forms. There is no need for tedious processes such as "turning, boring, milling, planing" and "casting, satin, welding", and material preparation and functional model or part processing can be achieved in a short time. The nozzle diameter in the injection process can reach tens or hundreds of microns, and the width of the injection line in biological tissue engineering can be controlled to be around tens of microns, so the microporous structure can be precisely controlled.

[0024] By determining the quantitative comparative relationship between the influence of stone-soil-wax materials and structures on performance, and taking the similar performance range of the model body and the model bed as the gradient target, a gradient porous structure combination of the slippery layer under the conditions of gradual transition of material composition is designed, the two-component powder and binder mixing feeding system is improved, the online mixing and spraying of the three components of stone-soil-wax is realized, and the material and structure variable gradient transition of the performance gradient combination design is formed. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings required for describing the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without paying creative work.

[0026] Figure 1 It is a three-dimensional schematic diagram of the structure printing system of the present invention;

[0027] Figure 2 It is a front cross-sectional schematic diagram of the printing system structure of the present invention;

[0028] Figure 3 It is a schematic front view of the structure of the printing system of the present invention;

[0029] Figure 4 It is a schematic bottom view of the structure of the printing system of the present invention;

[0030] Figure 5 It is a front cross-sectional schematic diagram of a transmission screw rod of the present invention;

[0031] Figure 6 This is a schematic cross-sectional view of the transmission screw structure of the present invention.

[0032] Figure 7 It is a schematic diagram of the material forming state of the structure printing method of the present invention.

[0033] In the accompanying drawings, the components represented by the reference numerals are listed as follows:

[0034] 1-support seat, 2-transmission screw, 3-motor one, 4-feed port, 5-groove, 6-diversion branch, 7-discharge main channel, 8-static mixer, 9-mixing nozzle, 10-installation side plate, 11-sealing ring one, 12-sealing groove one, 13-fixing screw, 14-fixing flange, 15-sealing plug, 16-pull ring, 17-fixing spiral tube, 18-fixing sleeve, 19-limiting ring plate, sealing groove two, 20-sealing groove two, 21-sealing ring two, 22-motor two, 23 rotating connecting rod, 24-control valve plate, 25-sealing rubber plug ring. DETAILED DESCRIPTION

[0035] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention. Example

[0036] See also Figure 1-6 The present invention provides a technical solution: comprising a support seat 1, a plurality of conveying screws 2 are arranged on the top of the support seat 1, and a motor 3 is arranged on the top surface of the conveying screw 2, the output shaft of the motor 3 rotates and penetrates into the conveying screw 2 and is fixed with an extrusion rod, a feed port 4 is fixed through the side of the conveying screw 2, a fixing flange 14 is fixed at the lower part of the conveying screw 2, and a fixing screw 13 is inserted inside the fixing flange 14, the bottom surface of each fixing screw 13 is fixed to the top surface of the support seat 1, and a nut is threadedly sleeved on the fixing screw 13 on the top surface of the fixing flange 14, and mounting side plates 10 are fixed on both sides of the support seat 1;

[0037] A guide channel 6 is provided inside the support seat 1 to cooperate with the conveying screw 2. The lower part of each guide channel 6 is set to be bent toward the side of the drainage channel 7. A groove 5 is provided at the top of each guide channel 6 to cooperate with the conveying screw 2, and the height of the groove 5 is equal to the height between the fixed flange 14 and the bottom surface of the conveying screw 2. The diameter of the guide channel 6 is greater than the inner ring diameter of the conveying screw 2. A drainage channel 7 is provided inside the support seat 1 at the bottom of the guide channel 6. A sealing groove 12 is provided on the bottom surface of each conveying screw 2. A fixed flange 14 is provided inside each groove 5. There is a sealing ring 11 inserted in the sealing groove 12, and the sealing ring 11 and the sealing groove 12 are both arranged in a ring shape that matches each other. A pull ring 16 is inserted into the groove 5 at the top of each diversion branch 6, and a sealing plug 15 is fixed to the middle of the top surface of the pull ring 16. The thickness of the sealing plug 15 is equal to the thickness between the sealing ring 11 and the top surface of the support seat 1. A static mixer 8 is arranged at the bottom of the support seat 1, and the top input end of the static mixer 8 is connected with the drainage main channel 7, and the bottom output end of the static mixer 8 can be detachably installed with a mixing nozzle 9.

[0038] Among them, when printing is required, first install the side plate 10 to mount the support seat 1 on the top of the three-axis mobile platform, and then according to the type of required material, during installation, pull the pull ring 16 to pull the seal 15 out of the groove 5 to open the groove 5, and then install the corresponding number of conveying screws 2, and fix the conveying screw 2 on the support seat 1. When fixing, insert the lower part of the conveying screw 2 into the groove 5, and make the fixing flange 14 sleeve on the fixing screw 13, and then fix it with a nut. At this time, the sealing ring 11 is inserted into the sealing groove 12 to ensure the sealing connection between the support seat 1 and the conveying screw 2. The powder and liquid sent into the guide branch channel 6 and the drainage main channel 7 are mixed by the static mixer 8, and then printed by spraying glue through the mixing nozzle 9. At this time, the two powders enter the conveying screw 2 through the feed port 4 respectively, and then are conveyed to the drainage main channel 7 through the guide branch channel 6 through the conveying screw 2, and the powders are mixed by the static mixer 8.

[0039] See also Figure 1-6 , a motor 22 is provided on the outer surface of the lower part of the support seat 1, and the output shaft of the motor 22 rotates and penetrates into the inside of the support seat 1, a control valve plate 24 is rotatably provided at the lower part of each guide branch 6, and the edge of each control valve plate 24 is set in a semicircular arc shape, and the outer surface of the control valve plate 24 is slidably fitted with the inner wall of the guide branch 6, and a sealing rubber plug ring 25 is glued and fixed to the outer surface of each rotating connecting rod 23, and a rotating hole matching the sealing rubber plug ring 25 and the rotating connecting rod 23 is opened inside the support seat 1 outside each guide branch 6, and a rotating connecting rod 23 is fixed on one end of each motor 22 extending into the inside of the support seat 1, and the end of the rotating connecting rod 23 away from the motor 22 is fixed on the side surface of the control valve plate 24.

[0040] Among them, inside the guide branch 6 where the conveying screw 2 is not installed, the motor 22 is turned on, so that the motor 22 can drive the rotating connecting rod 23 to rotate, and the control valve plate 24 can be driven to rotate by the rotating connecting rod 23, so that the control valve plate 24 can be rotated to open the guide branch 6, and the sealing rubber plug ring 25 ensures the sealing inside the guide branch 6 during rotation.

[0041] See also Figure 1-6 A fixed screw 17 is fixedly sleeved on the outer surface of the lower part of the static mixer 8, and a fixed sleeve 18 is threadedly sleeved on the outer side of the fixed screw 17. The fixed sleeve 18 is movably sleeved on the outer surface of the mixing nozzle 9. A limiting ring plate 19 is fixed to the outer surface of the top of the mixing nozzle 9. The limiting ring plate 19 is set to a ring shape that matches the mixing nozzle 9. A sliding hole that matches the mixing nozzle 9 is opened at the lower part of the fixed sleeve 18, and the diameter of the sliding hole is smaller than the diameter of the limiting ring plate 19. The fixed sleeve 18 is limited and reinforced by the limiting ring plate 19 to ensure the firmness of the connection between the fixed sleeve 18 and the fixed screw 17. The inner wall of the fixed sleeve 18 and the outer surface of the fixed screw 17 are provided with mutually matching threads. A sealing ring 21 is fixed at the lower part of the static mixer 8, and a sealing groove 20 that matches the sealing ring 21 is opened on the top surface of the mixing nozzle 9.

[0042] Among them, when it is necessary to disassemble the mixing nozzle 9, first rotate the fixed sleeve 18 to release the fixation between the fixed sleeve 18 and the fixed screw 17, and then release the fixation between the mixing nozzle 9 and the fixed screw 17, and then separate the mixing nozzle 9 from the static mixer 8, and perform maintenance on the static mixer 8 and the mixing nozzle 9. After the maintenance is completed, align the mixing nozzle 9 with the static mixer 8. After alignment, insert the sealing ring 21 into the sealing groove 20, and screw the fixed sleeve 18 until it is fixed with the fixed screw 17, and at the same time make the fixed sleeve 18 abut against the bottom of the limiting ring plate 19.

[0043] The system can be divided into three modes: using the left and right conveying screws 2 simultaneously, using the left conveying screw 2 or the right conveying screw 2 alone, and not applicable. The automatic control device controls the control valve halves on the left and right sides according to the system use mode.

[0044] When the system is in the mode of using the left and right screws at the same time, the automatic control device opens the two conveying screws 2 to put in different materials respectively, and enters the support seat 1 through the flow channel. The control valve plates 24 on both sides ensure the sealing inside the guide branch 6 and enter the mixing nozzle 9. The feeding speed of the conveying screw 2 can realize the material gradient control of the model printing. This mode can make full use of the gradient forming of the two materials, or mix the two materials to form a new material, which can meet the advantages of the new material design.

[0045] When the system is in the screw single use mode, the automatic control device opens the conveying screw 2 to put different materials in respectively, and enters the support seat 1 through the flow channel. The control valve plate 24 ensures the sealing of the support seat 1, and enters the mixing nozzle 9. Controlling the feeding speed of the conveying screw 2 can realize the material gradient control of the model printing. In this mode, the single screw can be disassembled and used for easy cleaning.

[0046] When the system is in a non-use mode, the automatic control device closes the support seat 1 , and the control valve plate 24 still needs to be tightened to ensure the sealing of the support seat 1 . Example

[0047] A variable gradient printing method for an engineering geological model, the variable gradient printing method comprising the following steps:

[0048] (1) Realize the overall gradient from material 1 to material 2, the position fraction changes from 0 to 1, and the volume fraction changes from 0.05 to 0.95. In the step (1), when the system is printing, the XYZ axis direction model is defined to be consistent with the three-axis printing direction of the printer, wherein the X-axis and Y-axis planes are parallel to the printing platform, and the Z-axis direction is the printing layer height direction;

[0049] (2) Realize the gradient change from material 1 to material 2 and then to material 1. The position fraction changes from 0 to 0.5, the volume fraction changes from 0.05 to 0.95, the position fraction changes from 0.5 to 1, and the volume fraction changes from 0.95 to 0.05;

[0050] (3) Realize the gradient from material 2 to material 1 and then to material 2. The position fraction changes from 0 to 0.5, the volume fraction changes from 0.95 to 0.05, the position fraction changes from 0.5 to 1, and the volume fraction changes from 0.05 to 0.95;

[0051] (4) Realize the variable gradient from material 2 to material 1 and then to material 2 to material 1. The position fraction changes from 0 to 0.25, and the volume fraction changes from 0.95 to 0.95. The position fraction changes from 0.25 to 0.5, and the volume fraction changes from 0.05 to 0.05. The position fraction changes from 0.5 to 0.95, and the volume fraction changes from 0.05 to 0.95.

[0052] In the description of this specification, the description with reference to the terms "one embodiment", "example", "specific example", etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0053] The preferred embodiments of the present invention disclosed above are only used to help illustrate the present invention. The preferred embodiments do not describe all the details in detail, nor do they limit the invention to the specific implementation methods described. Obviously, many modifications and changes can be made according to the content of this specification. This specification selects and specifically describes these embodiments in order to better explain the principles and practical applications of the present invention, so that those skilled in the art can understand and use the present invention well. The present invention is limited only by the claims and their full scope and equivalents.

Claims

1. A variable gradient printing system for an engineering geological model, comprising a support base (1), characterized in that: A plurality of conveying screws (2) are arranged on the top of the support seat (1), and a motor (3) is arranged on the top surface of each conveying screw (2). The output shaft of the motor (3) rotates and penetrates into the conveying screw (2) and is fixed with an extrusion rod. A feed port (4) is fixed through the side of the conveying screw (2). A fixing flange (14) is fixed at the bottom of the conveying screw (2), and a fixing screw (13) is inserted into the fixing flange (14). The bottom surface of each fixing screw (13) is fixed to the top surface of the support seat (1). A nut is threadedly sleeved on the fixing screw (13) on the top surface of the fixing flange (14). Mounting side plates (10) are fixed on both sides of the support seat (1). The support seat (1) is provided with a flow guide branch channel (6) cooperating with the conveying screw (2), and the support seat (1) at the bottom of the flow guide branch channel (6) is provided with a liquid discharge channel (7), a static mixer (8) is provided at the bottom of the support seat (1), and the top input end of the static mixer (8) is connected to the liquid discharge channel (7), and a mixing nozzle (9) is detachably installed at the bottom output end of the static mixer (8); The lower part of each of the diversion branches (6) is arranged in a bent shape facing the side of the drainage main channel (7), and the top of each of the diversion branches (6) is provided with a groove (5) that matches with the conveying screw (2), and the height of the groove (5) is equal to the height between the fixed flange (14) and the bottom surface of the conveying screw (2), and the diameter of the diversion branch (6) is greater than the inner ring diameter of the conveying screw (2); Each of the conveying screw rods (2) is provided with a sealing groove (12) on its bottom surface, and each groove (5) is provided with a sealing ring (11) inserted into the sealing groove (12) and fixed inside the groove, and the sealing ring (11) and the sealing groove (12) are both arranged in a ring shape that fits with each other; A pull ring (16) is inserted into the groove (5) at the top of each diversion branch channel (6), and a sealing plug (15) is fixed in the middle of the top surface of the pull ring (16), and the thickness of the sealing plug (15) is equal to the thickness between the sealing ring (11) and the top surface of the support seat (1); A fixed spiral tube (17) is fixedly sleeved on the outer surface of the lower part of the static mixer (8), and a fixed sleeve (18) is threadedly sleeved on the outer side of the fixed spiral tube (17). The fixed sleeve (18) is movably sleeved on the outer surface of the mixing nozzle (9). A limiting ring plate (19) is fixed on the outer surface of the top of the mixing nozzle (9). A second sealing ring (21) is fixed on the lower part of the static mixer (8), and a second sealing groove (20) cooperating with the second sealing ring (21) is formed on the top surface of the mixing nozzle (9).

2. The variable gradient printing system for engineering geological models according to claim 1, characterized in that: The lower outer surface of the support seat (1) is provided with a second motor (22), and the output shaft of the second motor (22) is rotatably penetrated into the interior of the support seat (1), and a control valve plate (24) is rotatably provided at the lower inner portion of each of the diversion branches (6), and a rotating connecting rod (23) is fixed to one end of each of the second motors (22) extending into the interior of the support seat (1), and the end of the rotating connecting rod (23) away from the second motor (22) is fixed to the side surface of the control valve plate (24).

3. The variable gradient printing system for engineering geological models according to claim 1, characterized in that: The limiting ring plate (19) is arranged in a ring shape to cooperate with the mixing nozzle (9); a sliding hole to cooperate with the mixing nozzle (9) is provided at the lower portion of the fixing sleeve (18); the diameter of the sliding hole is smaller than the diameter of the limiting ring plate (19); and mutually cooperating threads are provided on the inner wall of the fixing sleeve (18) and the outer surface of the fixing spiral tube (17).

4. The variable gradient printing system for engineering geological models according to claim 2, characterized in that: The edge of each control valve plate (24) is arranged in a semicircular arc shape, and the outer surface of the control valve plate (24) is slidably fitted with the inner wall of the diversion branch channel (6), and the outer surface of each rotating connecting rod (23) is glued and fixed with a sealing rubber plug ring (25), and the inside of the support seat (1) outside each diversion branch channel (6) is provided with a rotating hole that cooperates with the sealing rubber plug ring (25) and the rotating connecting rod (23).

5. A variable gradient printing method for a variable gradient printing system for an engineering geological model according to any one of claims 1 to 4, characterized in that: The variable gradient printing method comprises the following steps: (1) Realize the overall gradient from material 1 to material 2, the position fraction changes from 0 to 1, and the volume fraction changes from 0.05 to 0.95; (2) Realize the gradient change from material 1 to material 2 and then to material 1. The position fraction changes from 0 to 0.5, the volume fraction changes from 0.05 to 0.95, the position fraction changes from 0.5 to 1, and the volume fraction changes from 0.95 to 0.05; (3) Realize the gradient from material 2 to material 1 and then to material 2. The position fraction changes from 0 to 0.5, the volume fraction changes from 0.95 to 0.05, the position fraction changes from 0.5 to 1, and the volume fraction changes from 0.05 to 0.95; (4) Realize the variable gradient from material 2 to material 1 and then to material 2 to material 1. The position fraction changes from 0 to 0.25, and the volume fraction changes from 0.95 to 0.

95. The position fraction changes from 0.25 to 0.5, and the volume fraction changes from 0.05 to 0.

05. The position fraction changes from 0.5 to 0.95, and the volume fraction changes from 0.05 to 0.

95.

6. The variable gradient printing method according to claim 5, characterized in that: In the step (1), when the system is printing, the XYZ axis direction model is defined to be consistent with the three-axis printing direction of the printer, wherein the X-axis and Y-axis planes are parallel to the printing platform, and the Z-axis direction is the printing layer height direction.

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