Testing device for simulating rockburst

Abstract

The invention relates to a test device for simulating rockburst, and belongs to the technical field of geological engineering and underground engineering. The test device for simulating rockburst comprises a box body, a fixed limiting block I, a fixed limiting block II, a fixing assembly and a mounting assembly, the fixed limiting block I and the fixed limiting block II are arranged on a working table in parallel to form a limiting groove, and the box body is arranged in the limiting groove; the fixing assembly comprises a double-shaft motor, a worm gear I, a worm gear II, a threaded rod I, a threaded rod II, a sliding rod I, a sliding rod II and an extrusion block. The mounting assembly comprises a drill bit, an inserting cavity is formed in the center of the splicing block, and the drill bit is horizontally and fixedly arranged in the inserting cavity of the splicing block. The device provided by the invention can realize dynamic and accurate control of the pressed state of the rock sample, and solves the problem of test distortion caused by single pressure regulation of a traditional device. Meanwhile, drilling position deviation caused by drill bit installation eccentricity is eliminated, and a reliable data basis is provided for rock burst mechanism research.

Description

Technical Field

[0001] This invention relates to a test device for simulating rockbursts, belonging to the field of geological engineering and underground engineering technology. Background Technology

[0002] As underground space development extends deeper, rockburst disasters become more frequent, posing a serious threat to mining, tunnel excavation, and underground chamber construction. A rockburst is a dynamic destructive phenomenon caused by the sudden release of elastic strain energy accumulated in the rock mass under the combined effects of high ground stress, brittle rock mass, and excavation disturbance, resulting in rock fracturing, ejection, or even being thrown. Accurately simulating the rockburst process and exploring its occurrence mechanism is of great significance for developing effective disaster prevention and control measures.

[0003] However, existing rockburst simulation test devices have several technical shortcomings: First, traditional devices mostly use mechanical structures with fixed stiffness, and the applied pressure cannot be dynamically adjusted according to the actual hardness of the rock sample, resulting in significant deviations between the test results and real rockburst conditions. Second, in the drilling operation, due to the lack of a precise positioning mechanism, it is difficult to ensure the precise alignment of the drill spindle and the drill bit axis when manually installing the drill bit, easily leading to eccentricity. This alignment deviation not only causes problems such as borehole position shift and irregular hole diameter, but also produces a progressively accumulating error amplification effect in deep hole drilling operations, seriously affecting the accuracy of test data and its engineering guidance value. In addition, existing devices also suffer from problems such as complex operation and insufficient adjustment precision in terms of rock sample fixing and pressure application methods. Summary of the Invention

[0004] To address the technical problems of existing rockburst simulation test devices, this invention proposes a test device for simulating rockbursts. This device enables dynamic and precise control of the compression state of rock samples. By adjusting the speed of the dual-axis motor to change the movement rate of the extrusion block, and combining this with the adjustment of the threaded rod lead, the final extrusion pressure can be precisely controlled. This adapts to the fixation requirements of rocks of different hardness, such as shale and granite, and solves the problem of test distortion caused by the single pressure adjustment method in traditional devices. Simultaneously, it eliminates borehole position deviations caused by drill bit eccentricity, providing a reliable data foundation for the study of rockburst mechanisms.

[0005] A test apparatus for simulating rockburst includes a housing 1, a fixed limiting block I 3, a fixed limiting block II, a fixing component 2, and an installation component 9. The fixed limiting blocks I 3 and II are arranged parallel to each other on a worktable to form a limiting groove. The housing 1 is placed within the limiting groove. The bottom of the housing 1 is a first cavity. The top of the housing 1 has vertical sliding grooves I and II communicating with the first cavity. Vertical sliding grooves I and II are symmetrically arranged on both sides of a central axis. The housing 1 is in contact with the fixed limiting block I 3. The side of the box 1 is side A, and the side of the box 1 that contacts the fixed limiting block II is side B. A base plate 4 is fixedly installed on the worktable on side A of the box 1. The base plate 4 is attached to the side of the fixed limiting block I 3. A connecting seat 5 is fixedly installed on the base plate 4. A moving block 6 is installed on the connecting seat 5. A single-axis motor II 13 is fixedly installed on the top of the moving block 6. A rotating rod 7 is fixedly installed at the output end of the single-axis motor II 13. A splicing block 8 is fixedly installed at the end of the rotating rod 7. An installation component 9 is installed at the end of the splicing block 8. The fixing assembly 2 includes a dual-axis motor 201, worm gear I, worm gear II 203, threaded rod I, threaded rod II 204, sliding rod I 205, sliding rod II, and pressing block 206. A second cavity is formed at the center of the top of the housing 1. The dual-axis motor 201 is fixedly installed in the second cavity. The two output shafts of the dual-axis motor 201 are output shaft A' and output shaft B', respectively. A transmission rod I is fixedly installed at the end of the output shaft A' of the dual-axis motor 201. A worm gear I 202 is fixedly installed at the end of the transmission rod I. The threaded rod I is vertically installed in the vertical slide groove I. The top end of the threaded rod I is rotatably connected to the top wall of the housing 1 directly above the vertical slide groove I. Worm gear I is fixedly installed at the top of the threaded rod I. Worm gear I 202 meshes with worm gear I for transmission. Sliding rod I 205 slides... Inside the vertical slide groove I, the bottom of the threaded rod I is threadedly connected to the top of the sliding rod I 205; the output shaft of the dual-shaft motor 201B' is fixedly equipped with a transmission rod II, and the end of the transmission rod II is fixedly equipped with a worm gear II; the threaded rod II 204 is vertically installed inside the vertical slide groove II, and the top of the threaded rod II 204 is rotatably connected to the top wall of the box 1 directly above the vertical slide groove II; the worm wheel II 203 is fixedly installed on the top of the threaded rod II 204, and the worm gear II and the worm wheel II 203 mesh and transmit power; the sliding rod II slides inside the vertical slide groove II, and the bottom of the threaded rod II is threadedly connected to the sliding rod II; the extrusion block 206 is fixedly installed at the bottom of the sliding rod I 205 and the sliding rod II; the rock sample is placed in the first cavity of the box 1, and the extrusion block 206 is located directly above the rock sample; The installation component 9 includes a drill bit 901, and the splicing block 8 has a insertion cavity in the center. The drill bit 901 is horizontally fixed in the insertion cavity of the splicing block 8.

[0006] Bidirectional independent pressure adjustment is achieved through a dual-axis motor-driven worm gear mechanism. The dual-axis motor, located in the second cavity at the top of the housing, drives the worm gear mechanisms on both sides via output shafts A' and B' respectively. The meshing transmission between worm I and worm gear I controls threaded rod I, which in turn moves sliding rod I up and down. Similarly, the meshing transmission between worm II and worm gear II controls threaded rod II, which in turn moves sliding rod II up and down. This split-type transmission structure allows the two extrusion blocks to move synchronously to apply balanced pressure, or to be adjusted individually to adapt to different rock hardnesses. The symmetrical distribution of vertical grooves I and II on both sides of the central axis, combined with the sliding engagement of the positioning protrusion on the sliding rod and the guide groove, ensures the stability of the vertical movement of the extrusion blocks and prevents lateral displacement during pressure application. The mounting assembly horizontally fixes the drill bit through the insertion cavity of the splicing block. Combined with the displacement adjustment of the moving block within the connecting seat groove, the single-axis motor II drives the rotating rod to axially align the drill bit, eliminating axial deviations caused by manual installation. The base plate is fitted against the side of the fixed limiting block I, enhancing the overall stability of the housing during testing and preventing device displacement due to vibration. The self-locking characteristic of the worm gear transmission mechanism can maintain a constant pressure in the extrusion block after the motor stops, avoiding the pressure decay problem that may exist in traditional hydraulic systems.

[0007] Preferably, the mounting assembly 9 further includes a plug-in block 903, a threaded rod Ⅲ 905, and a rotating wheel 19. The splicing block 8 has two limiting cavities perpendicular to the plug-in cavity, symmetrically distributed on both sides of the plug-in cavity, and communicating with it. The plug-in block 903 is disposed within the limiting cavities. The two opposite sides of the plug-in block 903 are side A” and side B”, respectively. A threaded sleeve 904 is fixedly disposed on side A” of the plug-in block 903. A limiting through hole communicating with the limiting cavity is formed on the outer wall of the splicing block 8, and a ball bearing is fixedly disposed within the limiting through hole. The threaded section of the rotating shaft and threaded rod Ⅲ905 is horizontally inserted into the limiting cavity. The end of the threaded section of threaded rod Ⅲ905 is threadedly connected to the threaded sleeve 904 on the side of the insertion block 903A”. The smooth section of threaded rod Ⅲ905 passes outward through the inner ring of the ball rotating shaft and extends to the outside of the splicing block 8. The rotating wheel 19 is fixedly set at the end of the smooth section of threaded rod Ⅲ905. The end side wall of drill bit 901 is symmetrically provided with slots. When the end of drill bit 901 is set in the insertion cavity of splicing block 8, the B” side of insertion block 903 is locked in the slot on the end side wall of drill bit 901.

[0008] The symmetrically distributed limiting cavities connect to the insertion cavity, allowing the insertion block to move perpendicular to the drill bit's axis. Utilizing the engagement of threaded rod III and threaded sleeve, a rotating wheel drives the insertion block towards the drill bit's sidewall and clamps it, ensuring the drill bit's axis coincides with the spindle axis. The ball bearing shaft reduces frictional resistance during threaded rod III rotation, improving adjustment accuracy. The design of the insertion block's B side fitting snugly against the drill bit's end sidewall creates symmetrical clamping force, preventing drill bit deflection due to unilateral pressure. The symmetrically distributed limiting cavities and the insertion block work together to keep the drill bit centered within the insertion cavity, eliminating installation misalignment issues.

[0009] More preferably, a guide groove is provided axially in the insertion cavity of the splicing block 8, and a positioning block 902 matching the guide groove is fixedly provided on the side wall of the drill bit 901 end. When the drill bit 901 end is placed in the insertion cavity of the splicing block 8, the positioning block 902 slides in the guide groove.

[0010] An axially constrained insertion structure is formed by setting an axial guide groove within the splicing block's insertion cavity and a matching positioning block on the drill bit's end sidewall. When the drill bit is inserted into the splicing block, the positioning block slides along the guide groove, forcibly limiting the axial alignment between the drill bit and the splicing block. This structure eliminates angular deviations during manual installation through mechanical limiting, ensuring the coaxiality of the drill bit's axis and the drive spindle. The axial extension characteristics of the guide groove further ensure that the drill bit does not experience radial displacement during rotation, avoiding the accumulation of drilling position errors caused by eccentricity. The matching design of the positioning block and the guide groove achieves both rapid positioning and installation, and maintains the dynamic stability of the drill bit during operation through the constraint of the sliding contact surface.

[0011] Preferably, the two ends of the connecting seat 5 are end C and end D, respectively. A groove is provided at the top of the connecting seat 5 along the direction from end C to end D. A limiting hole is provided on the inner wall of the groove near end C of the connecting seat 5. A third cavity is provided inside end D of the connecting seat 5. A threaded through hole I communicating with the groove is provided on the side wall of the third cavity. A single-axis motor I10 is fixedly installed in the third cavity. A transmission rod III is fixedly installed at the output end of the single-axis motor I10. A threaded rod IV11 is fixedly installed at the end of the transmission rod III. The threaded rod IV11 extends horizontally through the threaded through hole I on the side wall of the third cavity into the groove. The end of the threaded rod IV11 is a smooth end. The end of the threaded rod IV11 is rotatably installed in the limiting hole. A horizontal threaded through hole II is provided at the bottom of the moving block 6. The threaded rod IV11 passes through the threaded through hole II and is threadedly connected to the threaded through hole II.

[0012] A closed transmission space is constructed by setting a connecting seat structure with a C-end limiting hole and a third cavity. When the single-axis motor I drives the threaded rod IV to rotate via the transmission rod III, the smooth end of the threaded rod IV and the rotational engagement with the limiting hole form an axial constraint, causing the threaded rod IV to generate pure rotational motion within the slide groove. The threaded through hole II at the bottom of the moving block forms a threaded pair with the threaded rod IV, converting the rotational motion into precise linear displacement of the moving block along the slide groove. This design achieves stepless precision positioning of the moving block through a mechanical transmission system, ensuring strict alignment between the drill bit mounting axis and the drive spindle. At the same time, the engagement structure between the smooth end of the threaded rod IV and the limiting hole effectively eliminates radial backlash during transmission, avoiding the axial movement problem present in traditional lead screw drives.

[0013] More preferably, the top of the moving block 6 has a fourth cavity, the single-axis motor II 13 is fixedly installed in the fourth cavity, and a horizontal through hole is opened on the side wall of the fourth cavity near the D end of the connecting seat 5. The two ends of the rotating rod 7 are the C' end and the D' end, respectively. The C' end of the rotating rod 7 passes through the horizontal through hole and is fixedly connected to the output shaft of the single-axis motor II 13. A limit ring 20 is fixedly installed at the D end of the connecting seat 5, and the D' end of the rotating rod 7 passes through the limit ring 20. The mounting assembly 9 is fixedly installed at the D' end of the rotating rod 7.

[0014] By fixing the single-axis motor II within the fourth cavity at the top of the moving block, an integrated design of the drive mechanism and moving components is achieved, avoiding external vibration interference. The horizontal through-hole ensures a rigid connection between the C' end of the rotating rod and the output shaft of the single-axis motor II, guaranteeing coaxiality of power transmission. A limiting ring fixed to the D end of the connecting seat provides radial constraint on the D' end of the rotating rod, effectively suppressing radial runout during high-speed rotation and ensuring the mounting assembly always moves along the predetermined axis. The structural design of the rotating rod passing through the limiting ring maintains axial freedom while limiting radial offset, allowing the drill bit to maintain a precise trajectory during drilling. Through the synergistic effect of the internal cavity layout of the moving block and the limiting ring, the problem of axial deviation caused by loose mechanical structures in traditional devices is fundamentally solved.

[0015] More preferably, the movable block 6 includes a movable horizontal part and a vertical slider 12. The movable horizontal part is fixedly disposed at the top of the vertical slider 12. The vertical slider 12 is inserted into the groove at the top of the connecting seat 5. The threaded through hole II is opened at the bottom of the vertical slider 12. A roller 21 is provided at the bottom of the movable horizontal part. The roller 21 contacts the top surface of the connecting seat 5.

[0016] By decomposing the moving block into a combined structure of a horizontal moving section and a vertical slider, the insertion and engagement of the vertical slider with the groove achieves precise horizontal positioning of the moving block, avoiding deflection caused by single-point support. A threaded through-hole II is directly formed at the bottom of the vertical slider, allowing the transmission force of the threaded rod IV to act directly on the slider's center of gravity axis, eliminating the influence of additional torque on movement accuracy. The roller at the bottom of the horizontal moving section forms a rolling friction pair with the top surface of the connecting seat, significantly reducing movement resistance compared to traditional sliding friction. This ensures smooth operation when the single-axis motor II drives the rotating rod, and avoids drill bit axis misalignment caused by sudden changes in frictional resistance. This split structure, through the synergistic effect of rigid connection and rolling support, achieves stepless precision adjustment of the drill bit installation position while ensuring structural strength.

[0017] Preferably, a hanging bracket is fixedly provided at the top of the box body 1, and a plurality of hanging rings 14 are fixedly provided at the top of the hanging bracket.

[0018] A dedicated lifting interface for the experimental device is provided by a lifting base structure with lifting rings at the top of the enclosure. The lifting base, acting as a load-bearing foundation, is rigidly connected to the enclosure, ensuring stable force transmission during lifting. The symmetrical distribution of multiple lifting rings accommodates lifting ropes at different angles, avoiding the risk of structural deformation caused by single-point stress. This structure allows the large enclosure to be moved smoothly using mechanical lifting equipment, solving the problem of difficult manual handling and reducing the safety hazards of equipment tilting or falling due to improper operation. It also ensures the enclosure maintains precise spatial positioning during the experiment.

[0019] More preferably, a door 15 is hinged to the side of the box body 1, and a handle 16 is fixedly provided on the door 15; a plug is fixedly provided on the side wall of the box body 1, and a protrusion is fixedly provided on the opening side of the door 15. Both the plug and the protrusion have insertion holes, and a pin 17 is inserted into the insertion holes.

[0020] The hinged connection enables the door to be opened and closed, while a handle provides a manual operating point, improving the ease of opening and closing. A plug and a protrusion are installed at corresponding positions on the chamber body and door, respectively. A pin passes through the insertion hole of both to form a mechanical locking structure, ensuring rigid fixation when the door is closed. The pin insertion method can withstand the lateral load generated by the internal pressure of the chamber during testing, while avoiding the cumbersome operation of traditional bolt connections that require repeated tightening. The separate design of the plug and protrusion allows for precise positioning when the door is closed. The locking method of inserting the pin after coaxial alignment of the insertion holes effectively prevents the door from accidentally opening under vibration, ensuring the safety of the testing process.

[0021] More preferably, an anti-slip pad 18 is fixedly provided at the bottom end of the extrusion block 206.

[0022] By placing an anti-slip pad at the bottom of the extrusion block, the coefficient of friction of the contact surface is significantly enhanced. This anti-slip pad directly contacts the surface of the rock sample, effectively preventing relative sliding between the extrusion block and the sample under high pressure by increasing the surface roughness. This structural design ensures that the vertical pressure transmitted by the dual-axis motor through the sliding rod is uniformly applied to the surface of the rock sample, avoiding pressure shift caused by slippage at the contact surface. This provides a fundamental condition for accurately simulating the complex stress state of deep rock masses subjected to unequal pressure in all directions. The fixed installation method of the anti-slip pad also ensures that it will not displace or fall off during long-term, high-frequency tests, maintaining the stability of the device operation.

[0023] More preferably, the inner wall of the top of the vertical slide groove I is provided with a rotation limiting groove I, and the worm gear I is disposed in the rotation limiting groove I; the inner wall of the top of the vertical slide groove II is provided with a rotation limiting groove II, and the worm gear II 203 is disposed in the rotation limiting groove I; the outer side of the sliding rod I 205 is symmetrically provided with positioning protrusions I, the inner wall of the vertical slide groove I is vertically provided with a guide groove I, and the positioning protrusions I slide on the guide groove I; the outer side of the sliding rod II is symmetrically provided with positioning protrusions II, the inner wall of the vertical slide groove II is vertically provided with a guide groove II, and the positioning protrusions II slide on the guide groove II.

[0024] The rotating limiting groove and the worm gear's engagement structure confine the worm gear transmission mechanism within a fixed space, preventing transmission failure due to positional misalignment during worm gear and worm meshing. The sliding engagement structure between the positioning protrusion and the guide groove ensures that the sliding rod always moves along a preset trajectory within the vertical groove, preventing lateral deviation or rotational wobbling due to uneven force. Specifically, rotating limiting grooves I and II constrain the axial displacement of worm gears I and II, respectively, ensuring the meshing accuracy of the worm and worm gear. The engagement of guide grooves I and II with positioning protrusions I and II forms a dual guiding mechanism, restricting both the radial movement and circumferential rotation of the sliding rod, thereby ensuring the stability of the rock sample when the extrusion block presses down vertically.

[0025] The beneficial effects of this invention are: (1) This invention changes the moving speed of the extrusion block by adjusting the speed of the dual-shaft motor and, combined with the adjustment of the lead of the threaded rod, precisely controls the final extrusion pressure, thereby adapting to the fixing requirements of rocks of different hardness such as shale and granite, and solving the problem of test distortion caused by the single pressure adjustment of traditional devices. (2) This invention can ensure that the drill bit axis and the rotor axis are strictly coaxial, and eliminate installation eccentricity through mechanical limiting, avoiding hole position displacement or drill bit wear due to axis deviation during drilling, thereby ensuring the accuracy requirements of the drilling position in simulated rockburst tests and providing a reliable data basis for the study of rockburst mechanism. Attached Figure Description

[0026] Figure 1A schematic diagram of the experimental setup for simulating rockburst; Figure 2 A side view of the three-dimensional structure of the test apparatus for simulating rockburst; Figure 3 This is a diagram illustrating the installation of fixed components; Figure 4 This is a schematic diagram of the assembly of the splicing block and the drill bit; Figure 5 A sectional view of the assembly of the splicing block and the drill bit; Figure 6 A schematic diagram of the assembly of the base plate, connecting seat, and moving block; In the diagram: 1-Box body, 2-Fixing component, 201-Dual-axis motor, 202-Worm gear I, 203-Worm wheel II, 204-Threaded rod II, 205-Sliding rod I, 206-Extrusion block, 3-Fixing limit block I, 4-Base plate, 5-Connecting seat, 6-Moving block, 7-Rotating rod, 8-Assembly block, 9-Installation component, 901-Drill bit, 902-Positioning block, 903-Plug-in block, 904-Threaded sleeve, 905-Threaded rod III, 10-Single-axis motor I, 11-Threaded rod IV, 12-Vertical slider, 13-Single-axis motor II, 14-Lifting ring, 15-Box door, 16-Handle, 17-Pin, 18-Anti-slip pad, 19-Rotating wheel, 20-Limiting ring, 21-Roller. Detailed Implementation

[0027] The technical solutions of this application will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are merely some embodiments of this application, and not all embodiments. The components of this application described and shown in the accompanying drawings can generally be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of this application provided in the accompanying drawings is not intended to limit the scope of the claimed application, but merely to illustrate selected embodiments of this application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application.

[0028] In existing technologies, rockburst disasters frequently occur during the development of deep underground engineering projects. Traditional testing devices suffer from problems such as limited pressure adjustment and borehole deviation due to eccentric drill bit installation. Fixed-rigidity mechanical structures cannot adapt to the testing requirements of rocks with varying hardness, and insufficient axis alignment accuracy during manual drill bit installation affects the reliability of test data. In a certain tunnel project, during rockburst simulation, uneven pressure application led to distorted sample fracture modes, and borehole position deviation caused stress release paths to deviate from the preset direction, directly impacting the effectiveness of disaster prevention and control measures.

[0029] This application proposes a test apparatus for simulating rockburst (see...). Figure 1-6The system includes a housing 1, a fixed limiting block I 3, a fixed limiting block II, a fixing component 2, and an installation component 9. The fixed limiting blocks I 3 and II are arranged parallel to each other on the worktable to form a limiting groove. The housing 1 is placed within the limiting groove. The bottom of the housing 1 is a first cavity. The top of the housing 1 has vertical sliding grooves I and II communicating with the first cavity. Vertical sliding grooves I and II are symmetrically arranged on both sides of the central axis. The side of the housing 1 that contacts the fixed limiting block I 3 is A. Side B is the side of the box body 1 that contacts the fixed limiting block II. A base plate 4 is fixedly installed on the worktable on side A of the box body 1. The base plate 4 is attached to the side of the fixed limiting block I 3. A connecting seat 5 is fixedly installed on the base plate 4. A moving block 6 is installed on the connecting seat 5. A single-axis motor II 13 is fixedly installed on the top of the moving block 6. A rotating rod 7 is fixedly installed at the output end of the single-axis motor II 13. A splicing block 8 is fixedly installed at the end of the rotating rod 7. An installation component 9 is installed at the end of the splicing block 8. The fixing assembly 2 includes a dual-axis motor 201, worm gear I, worm gear II 203, threaded rod I, threaded rod II 204, sliding rod I 205, sliding rod II, and pressing block 206. A second cavity is formed at the center of the top of the housing 1. The dual-axis motor 201 is fixedly installed in the second cavity. The two output shafts of the dual-axis motor 201 are output shaft A' and output shaft B', respectively. A transmission rod I is fixedly installed at the end of the output shaft A' of the dual-axis motor 201. A worm gear I 202 is fixedly installed at the end of the transmission rod I. The threaded rod I is vertically installed in the vertical slide groove I. The top end of the threaded rod I is rotatably connected to the top wall of the housing 1 directly above the vertical slide groove I. Worm gear I is fixedly installed at the top of the threaded rod I. Worm gear I 202 meshes with worm gear I for transmission. Sliding rod I 205 slides... Inside the vertical slide groove I, the bottom of the threaded rod I is threadedly connected to the top of the sliding rod I 205; the output shaft of the dual-shaft motor 201B' is fixedly equipped with a transmission rod II, and the end of the transmission rod II is fixedly equipped with a worm gear II; the threaded rod II 204 is vertically installed inside the vertical slide groove II, and the top of the threaded rod II 204 is rotatably connected to the top wall of the box 1 directly above the vertical slide groove II; the worm wheel II 203 is fixedly installed on the top of the threaded rod II 204, and the worm gear II and the worm wheel II 203 mesh and transmit power; the sliding rod II slides inside the vertical slide groove II, and the bottom of the threaded rod II is threadedly connected to the sliding rod II; the extrusion block 206 is fixedly installed at the bottom of the sliding rod I 205 and the sliding rod II; the rock sample is placed in the first cavity of the box 1, and the extrusion block 206 is located directly above the rock sample; The installation component 9 includes a drill bit 901, and the splicing block 8 has a insertion cavity in the center. The drill bit 901 is horizontally fixed in the insertion cavity of the splicing block 8.

[0030] A dual-axis motor refers to a drive device with two independent output shafts. Its A' and B' output shafts are respectively connected to two worm gear transmission chains, achieving separate pressure control. A worm gear transmission mechanism is a device that transmits power through the meshing of a worm and a worm wheel, utilizing its self-locking characteristic to maintain constant pressure. A splicing cavity refers to an axial cavity located at the center of the splicing block.

[0031] After the dual-axis motor starts, the output shaft A' drives worm gear I to rotate, causing worm wheel I to rotate. Threaded rod I rotates within the vertical groove I, causing sliding rod I to move vertically. Simultaneously, the output shaft B' drives worm gear II and worm wheel II on the other side, controlling the raising and lowering of sliding rod II. The pressure of the two pressing blocks can be adjusted independently or synchronously to adapt to different rock hardnesses. By controlling the worm gear mechanisms on both sides separately through the dual-axis motor, pressure can be applied synchronously to maintain balance, or adjusted individually to adapt to asymmetric stress conditions.

[0032] This application further proposes that the installation assembly 9 also includes a plug-in block 903, a threaded rod Ⅲ 905, and a rotating wheel 19. The splicing block 8 has two limiting cavities perpendicular to the plug-in cavity, symmetrically distributed on both sides of the plug-in cavity, and communicating with it. The plug-in block 903 is disposed within the limiting cavities. The two opposite sides of the plug-in block 903 are side A” and side B”, respectively. A threaded sleeve 904 is fixedly installed on side A” of the plug-in block 903. A limiting through hole communicating with the limiting cavity is opened on the outer wall of the splicing block 8, and a limiting through hole is fixedly installed within the limiting through hole. The ball bearing shaft and the threaded section of the threaded rod Ⅲ905 are horizontally inserted into the limiting cavity. The end of the threaded section of the threaded rod Ⅲ905 is threadedly connected to the threaded sleeve 904 on the side of the insertion block 903A”. The smooth section of the threaded rod Ⅲ905 passes outward through the inner ring of the ball bearing shaft and extends to the outside of the splicing block 8. The wheel 19 is fixedly set at the end of the smooth section of the threaded rod Ⅲ905. The end side wall of the drill bit 901 is symmetrically provided with slots. When the end of the drill bit 901 is set in the insertion cavity of the splicing block 8, the B” side of the insertion block 903 is locked in the slot on the end side wall of the drill bit 901.

[0033] The insertion block is a horizontally movable clamping component housed within the limiting cavity. Its B” side engages with a groove on the drill bit end sidewall to provide clamping force. The threaded rod III is an adjusting rod with a threaded section, which drives the insertion block to move through rotation. The ball bearing shaft is a bearing structure with built-in balls, used to reduce frictional resistance during the rotation of the threaded rod III. The wheel is a manually rotating component, specifically a wheel with anti-slip texture for easy operator application of force. The limiting cavity refers to the guide spaces symmetrically distributed on both sides of the insertion cavity, restricting the direction of movement of the insertion block.

[0034] After the drill bit is inserted into the insertion cavity of the splicing block, the operator rotates the two side rollers, causing the threaded rod III to rotate around the ball bearing shaft. Because the threaded section of the threaded rod III engages with the threaded sleeve of the insertion block, the rotation of the threaded rod III is converted into the horizontal movement of the insertion block along the limiting cavity. The "B" side of the insertion block gradually approaches the side wall of the drill bit end until both insertion blocks are simultaneously engaged in the slots on the side wall of the drill bit end, forming a symmetrical clamping. By adjusting the rotation angle of the two side rollers, the balanced distribution of clamping force can be controlled, ensuring that the drill bit axis coincides with the rod axis. The presence of the ball bearing shaft reduces the resistance when the threaded rod III rotates, preventing a decrease in adjustment accuracy due to friction. Through the synergistic effect of the symmetrically distributed limiting cavities and the insertion blocks, the drill bit clamping process is transformed into mechanical adjustment, eliminating interference from human factors. The combination of threaded rod III and ball bearing shaft enables high-precision fine-tuning, ensuring that the clamping force is evenly applied to both sides of the drill bit. This solves the problem of difficulty in accurately aligning the drill spindle and drill bit axis when manually installing the drill bit. The symmetrical clamping mechanism of the connector block automatically centers the drill bit within the connector cavity, avoiding misalignment caused by unilateral pressure. The cooperation between threaded rod III and ball bearing shaft enables stepless adjustment, allowing the operator to precisely control the clamping force and ensure that the drill bit axis is strictly aligned with the spindle axis, thereby eliminating drilling position deviation and irregular hole diameter.

[0035] This application further proposes that a guide groove is provided axially in the insertion cavity of the splicing block 8, and a positioning block 902 matching the guide groove is fixedly provided on the side wall of the drill bit 901 end. When the end of the drill bit 901 is placed in the insertion cavity of the splicing block 8, the positioning block 902 slides in the guide groove.

[0036] A guide groove is a linear groove structure extending axially along the insertion cavity of the splicing block, with its width matching the size of the positioning block. This structure provides forced guidance by limiting the movement trajectory of the positioning block. The positioning block is a protruding component fixed to the side wall of the drill bit tip, its shape forming a clearance fit with the guide groove. This component, through physical contact with the groove, constrains the radial degree of freedom of the drill bit during insertion.

[0037] During drill bit installation, the end of the drill bit must be inserted into the insertion cavity of the splicing block, at which point the positioning block is embedded in the guide groove. Due to the axial extension characteristic of the groove, the positioning block can only slide along the length of the groove, thus forcing the drill bit axis to coincide with the splicing block axis. When the single-axis motor drives the rotating rod to rotate, sliding friction occurs between the positioning block and the groove, continuously counteracting the radial offset force generated during drill bit operation. This mechanical limiting mechanism replaces the traditional manual visual alignment method, eliminating installation errors caused by differences in operator experience. By establishing physical constraints through a rigid guide structure, the subjective alignment process is transformed into mechanically forced positioning, ensuring a fixed geometric relationship between the drill bit axis and the drive spindle. The clearance fit design between the guide groove and the positioning block completely eliminates the eccentric installation phenomenon commonly found in existing technologies.

[0038] The cooperative structure of the guide groove and positioning block enables self-centering during drill bit installation, ensuring drilling position accuracy within the millimeter range. This design significantly reduces the cumulative effect of errors during deep hole drilling and avoids irregular hole diameters caused by eccentricity.

[0039] This application further proposes that the two ends of the connecting seat 5 are end C and end D, respectively. A sliding groove is opened at the top of the connecting seat 5 along the direction from end C to end D. A limiting hole is opened on the inner wall of the sliding groove near end C of the connecting seat 5. A third cavity is opened inside end D of the connecting seat 5. A threaded through hole I communicating with the sliding groove is opened on the side wall of the third cavity. A single-axis motor I10 is fixedly installed in the third cavity. A transmission rod III is fixedly installed at the output end of the single-axis motor I10. A threaded rod IV11 is fixedly installed at the end of the transmission rod III. The threaded rod IV11 extends horizontally through the threaded through hole I on the side wall of the third cavity into the sliding groove. The end of the threaded rod IV11 is a smooth end. The end of the threaded rod IV11 is rotatably installed in the limiting hole. A horizontal threaded through hole II is opened at the bottom end of the moving block 6. The threaded rod IV11 passes through the threaded through hole II and is threadedly connected to the threaded through hole II.

[0040] The C and D ends of the connecting seat refer to the two endpoints along the length of the connecting seat. The groove is used to constrain the movement trajectory of the moving block. The limiting hole is a hole opened in the inner wall of the groove, used to fix the smooth end of the threaded rod IV and limit its axial displacement. The third cavity is the closed space formed inside the D end of the connecting seat, used to accommodate the single-axis motor I. The smooth end of the threaded rod IV refers to the unthreaded part at the end of the rod, which cooperates with the limiting hole to achieve rotational support. The threaded through hole II is a hole with internal threads opened at the bottom of the moving block, which forms a threaded pair with the threaded rod IV to transmit motion.

[0041] Single-axis motor I drives threaded rod IV to rotate via transmission rod III. The smooth end of threaded rod IV rotates within a limiting hole, forming an axial fixed constraint. The threaded through hole II at the bottom of the moving block engages with the threaded section of threaded rod IV, converting the rotational motion of threaded rod IV into the linear motion of the moving block along the slide groove. Because the engagement between the smooth end of threaded rod IV and the limiting hole eliminates axial clearance, the displacement accuracy of the moving block within the slide groove is improved. Simultaneously, the threaded transmission method between threaded rod IV and threaded through hole II avoids radial offset in traditional lead screw drives, ensuring that the moving axis of the moving block remains strictly aligned with the drive spindle.

[0042] The transmission components are protected by a closed third cavity structure. Combined with the rotational engagement of the smooth end of threaded rod IV with the limiting hole, radial vibration and axial movement during transmission are effectively suppressed. The threaded transmission method between threaded rod IV and the moving block further improves displacement control accuracy. Precise linear displacement control of the moving block on the connecting seat is achieved, solving the problem of drilling position deviation caused by drill bit installation axis misalignment. The engagement structure of threaded rod IV and the limiting hole ensures the stability of the transmission system, keeping the drill bit axis aligned with the drive spindle at all times, maintaining drilling accuracy even under high-frequency vibration conditions. This structure further reduces manual adjustment errors, providing a reliable mechanical control basis for drilling positioning in rockburst tests.

[0043] This application further proposes that the top of the moving block 6 has a fourth cavity, the single-axis motor II 13 is fixedly installed in the fourth cavity, and a horizontal through hole is opened on the side wall of the fourth cavity near the D end of the connecting seat 5. The two ends of the rotating rod 7 are the C' end and the D' end, respectively. The C' end of the rotating rod 7 passes through the horizontal through hole and is fixedly connected to the output shaft of the single-axis motor II 13. A limit ring 20 is fixedly installed at the D end of the connecting seat 5, and the D' end of the rotating rod 7 passes through the limit ring 20. The mounting assembly 9 is fixedly installed at the D' end of the rotating rod 7.

[0044] The fourth cavity refers to the internal space located at the top of the moving block, used to accommodate the single-axis motor II. This design integrates the drive mechanism inside the moving block, reducing external vibration interference. The horizontal through hole refers to the through-hole opened in the side wall of the fourth cavity, used to guide the rigid connection between the rotating rod and the output shaft of the single-axis motor II, ensuring the consistency of the power transmission axis. The limiting ring is a ring-shaped constraint component fixed to the end of the connecting seat D. Specifically, it can be implemented by welding a metal ring to the connecting seat, used to limit the radial displacement of the rotating rod during high-speed rotation, preventing axis misalignment.

[0045] The single-axis motor II is fixed in the fourth cavity at the top of the moving block. Its output shaft is rigidly connected to the C' end of the rotating rod through a horizontal through hole, ensuring that the power transmission path coincides with the axis of the rotating rod. When the D' end of the rotating rod passes through the limiting ring, the inner wall of the limiting ring forms a clearance fit with the outer surface of the rotating rod, allowing the rotating rod to rotate freely but restricting its radial runout. When the single-axis motor II drives the rotating rod to rotate, the mounting assembly performs drilling operations under the drive of the D' end of the rotating rod. The limiting ring ensures that the drill bit's movement trajectory is strictly aligned with the preset axis by constraining the radial degree of freedom of the rotating rod.

[0046] By integrating the single-axis motor II inside the moving block, the influence of external vibration on the axis is eliminated. Simultaneously, a limiting ring is used to radially limit the end of the rotating rod, forming a double-end constraint structure, significantly improving the coaxial accuracy of the rotating rod's rotation. This achieves precise alignment between the drill bit and the drive spindle axis, effectively avoiding drilling position deviation and irregular hole diameter problems, ensuring the stability of the drill bit trajectory during drilling, and thus improving the reliability of drilling data in rockburst simulation tests.

[0047] This application further proposes that the movable block 6 includes a movable horizontal part and a vertical slider 12. The movable horizontal part is fixedly disposed at the top of the vertical slider 12. The vertical slider 12 is inserted into the groove at the top of the connecting seat 5. The threaded through hole II is opened at the bottom of the vertical slider 12. A roller 21 is provided at the bottom of the movable horizontal part. The roller 21 contacts the top surface of the connecting seat 5.

[0048] The moving horizontal section refers to the horizontal support structure that supports the single-axis motor II and the rotating rod. Its bottom plane is fixed perpendicularly to the vertical slider and is used to transmit the horizontal driving force. The vertical slider is a vertical guide component that cooperates with the slide groove. Its cross-sectional shape matches the inner cavity of the slide groove to ensure no lateral deviation during movement. The roller is a rolling element installed at the bottom of the moving horizontal section. It is hinged to the moving horizontal section through a shaft pin, so that the outer edge of the roller forms a line contact with the top surface of the connecting seat.

[0049] After the vertical slider is inserted into the groove, its two sides are fitted with the inner wall of the groove with a clearance, restricting the rotational freedom of the moving block in the horizontal plane. When the threaded rod IV passes through the threaded through hole II at the bottom of the vertical slider, the line of action of the driving force passes through the center of gravity of the slider, avoiding the generation of additional torque. The roller at the bottom of the moving horizontal part contacts the top surface of the connecting seat, converting sliding friction into rolling friction and reducing moving resistance. When the single-axis motor I drives the threaded rod IV to rotate, the moving block translates along the axial direction of the groove, and the roller rolls accordingly, eliminating the jamming phenomenon caused by the fluctuation of the friction coefficient in traditional sliding guides. By combining the split slider and roller, rolling friction is used to reduce resistance, and the clearance fit between the vertical slider and the groove eliminates deflection error, achieving a smooth and jam-free movement process. This effectively solves the problem of jamming of the moving block in the groove due to frictional resistance, ensuring the axis alignment accuracy during drill bit installation. The rolling contact between the roller and the top surface of the connecting seat reduces moving resistance and improves the repeatability of the moving block, meeting the axis alignment requirements for deep hole drilling. The clearance fit between the vertical slider and the groove can compensate for machining and assembly errors and prevent the mechanism from jamming due to local stress concentration.

[0050] This application further proposes that a hanging bracket is fixedly installed at the top of the box 1, and a plurality of hanging rings 14 are fixedly installed at the top of the hanging bracket.

[0051] A lifting base is a load-bearing structure rigidly connected to the top of the housing, used to distribute the load during the lifting process. A lifting ring is a ring-shaped component installed on the lifting base; multiple rings are symmetrically distributed to accommodate lifting ropes at different angles, preventing localized deformation caused by single-point stress.

[0052] The lifting base, serving as the fundamental load-bearing structure, forms a rigid connection with the enclosure, ensuring that the load is evenly distributed to the entire enclosure structure during hoisting. Lifting rings are symmetrically distributed at the top of the lifting base and connected to slings via mechanical hoisting equipment, maintaining the enclosure's balance during handling. When the hoisting equipment applies tension, the load is transferred through the lifting rings to the lifting base and then evenly distributed to the enclosure, preventing structural damage due to localized stress concentration. During testing, the enclosure achieves precise positioning through the hoisting structure, ensuring accurate alignment with the fixed limit blocks and the worktable. By integrating a dedicated hoisting structure, the lifting rings are rigidly connected to the enclosure, forming a stable load transfer path, eliminating safety hazards during manual handling, and adapting to different specifications of hoisting equipment, thus improving operational efficiency. This solves the operational inconvenience and safety hazards caused by the lack of a dedicated hoisting structure during the handling or installation of the test device enclosure, achieving stable hoisting and precise positioning of the enclosure, and avoiding equipment damage or test data deviations due to human error.

[0053] This application further proposes that the box body 1 is hinged to the side of the box door 15, and a handle 16 is fixedly provided on the box door 15; a plug is fixedly provided on the side wall of the box body 1, and a protrusion is fixedly provided on the opening side of the box door 15. Both the plug and the protrusion are provided with insertion holes, and a pin 17 is inserted into the insertion holes.

[0054] The hinged design refers to the movable connection between the door and the cabinet body via a pivot structure, specifically using hinges or pins, enabling the door to open and close by rotation. The insert is a metal block structure fixed to the side wall of the cabinet body, with a through hole inside; the protrusion is a metal protrusion structure located on the edge of the door, with a through hole corresponding to the insert; the pin is a cylindrical locking component that passes through the through hole of the insert and the protrusion, achieving mechanical locking through manual insertion or removal.

[0055] The chamber door opens and closes by rotating around an axis via a hinged structure, and the operator applies force through the handle to complete the opening and closing action. When the chamber is closed, the through holes of the insert block and the protrusion automatically align, and the pin is inserted to form a rigid connection. The split design of the insert block and the protrusion forms a three-point positioning in the closed state, eliminating assembly gaps. The vertical insertion direction of the pin is orthogonal to the internal pressure direction of the chamber, effectively resisting lateral loads. An anti-dislodgement buckle can be installed at the end of the pin to prevent accidental dislodgement due to vibration during the test.

[0056] The composite locking structure of hinges and pins achieves rigid fixation of the chamber in the closed state while maintaining rapid opening and closing functionality. The separate design of the insert and protrusion solves the positioning deviation problem caused by easy wear of traditional one-piece locks. This enables one-step rapid opening and closing of the chamber door, significantly improving test preparation efficiency. The mechanical locking structure of the pin can withstand large lateral loads, ensuring sealing reliability under high-pressure test conditions. The separate positioning mechanism controls the door closing position deviation within 0.5 mm, effectively preventing seal failure caused by stress concentration. The anti-loosening design of the pin ensures that the chamber door remains stably closed even under high-frequency vibration environments, guaranteeing the safety of the test process.

[0057] This application further proposes that an anti-slip pad 18 is fixedly provided at the bottom end of the extrusion block 206.

[0058] Anti-slip mats are planar structures made of materials with a high coefficient of friction, such as rubber, polyurethane, or composite polymers. Their surfaces can be processed into a mesh or granular texture. These anti-slip mats prevent relative displacement between the compression block and the rock sample by increasing the coefficient of friction of the contact surface.

[0059] The anti-slip pad directly covers the contact surface between the extrusion block and the rock sample. When the sliding rod is pressed down by the dual-axis motor, the textured surface of the anti-slip pad embeds into the surface of the rock sample, forming a mechanical interlocking effect. This interlocking effect increases static friction, counteracting the horizontal component of the vertical pressure, thereby eliminating the tendency for the extrusion block and the sample to slide. The fixed installation method of the anti-slip pad ensures that it maintains a stable connection with the extrusion block even when subjected to high-frequency impact loads, avoiding connection failure due to material fatigue.

[0060] By adding anti-slip pads, the friction mode of the contact surface is transformed from simple molecular adsorption force to a combined effect of mechanical interlocking and molecular adsorption, significantly improving the critical sliding friction threshold. This effectively solves the problem of unstable pressure application caused by insufficient friction between the extrusion block and the rock sample. The physical interlocking effect of the anti-slip pads ensures that vertical pressure is uniformly transmitted to the sample surface, avoiding local stress concentration caused by pressure deviation, and providing stable boundary load conditions for rockburst simulation tests. The fixed connection method ensures the structural integrity of the anti-slip pads under long-term impact loads, maintaining the reusability of the test apparatus.

[0061] This application further proposes that the inner wall of the top of the vertical slide groove I is provided with a rotation limiting groove I, and the worm gear I is disposed in the rotation limiting groove I; the inner wall of the top of the vertical slide groove II is provided with a rotation limiting groove II, and the worm gear II 203 is disposed in the rotation limiting groove I; the outer side of the sliding rod I 205 is symmetrically provided with a positioning protrusion I, the inner wall of the vertical slide groove I is vertically provided with a guide groove I, and the positioning protrusion I slides on the guide groove I; the outer side of the sliding rod II is symmetrically provided with a positioning protrusion II, the inner wall of the vertical slide groove II is vertically provided with a guide groove II, and the positioning protrusion II slides on the guide groove II.

[0062] Rotation limiting groove I refers to an annular groove structure located on the inner sidewall of the top of the vertical slide groove I, used to accommodate the worm gear I and limit its radial displacement. Rotation limiting groove II adopts the same structure as rotation limiting groove I and is used to fix the axial position of the worm gear II. Guide groove I refers to a strip-shaped groove extending longitudinally along the inner wall of the vertical slide groove I, used to form a sliding fit with positioning protrusion I. Positioning protrusion I refers to a symmetrically arranged protrusion structure on the outside of the sliding rod I, whose cross-sectional shape matches that of guide groove I to achieve sliding limitation.

[0063] When the dual-axis motor drives worm I and worm II to rotate, worm gear I and worm gear II maintain a stable meshing state under the constraint of rotation limit groove I and rotation limit groove II, avoiding transmission failure caused by axial displacement of the worm gears. Sliding rod I and sliding rod II move along the vertical sliding groove under the drive of threaded rod I and threaded rod II. At this time, positioning protrusion I and positioning protrusion II are respectively embedded in guide groove I and guide groove II, forming a sliding pair structure. This structure eliminates the radial clearance of the sliding rod during movement through mechanical limiting, and at the same time prevents the sliding rod from rotating circumferentially due to uneven force, thereby ensuring that the extrusion block always maintains a vertical downward pressing trajectory.

[0064] By utilizing the synergistic effect of the rotation limiting groove and the guide groove, an axial positioning mechanism and a radial-circumferential dual limiting mechanism for the sliding rod are constructed in the worm gear transmission system, solving the problems of transmission offset and motion instability. This effectively suppresses the non-perpendicular motion component during the pressing process of the extrusion block, ensuring that the pressure direction of the rock sample is consistent with the preset experimental conditions, thereby improving the reliability of rockburst simulation data. Simultaneously, the positioning structure of the worm gear and sliding rod reduces the wear rate of transmission components caused by vibration, extending the service life of the device.

[0065] The specific embodiments of the present invention have been described in detail above. However, the present invention is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of the present invention.

Claims

1. A test apparatus for simulating rockburst, characterized in that: The assembly includes a housing (1), a fixed limiting block I (3), a fixed limiting block II, a fixing component (2), and an installation component (9). The fixed limiting blocks I (3) and II are arranged parallel to each other on the workbench to form a limiting groove. The housing (1) is placed in the limiting groove. The bottom of the housing (1) is a first cavity. The top of the housing (1) is provided with vertical sliding groove I and vertical sliding groove II that communicate with the first cavity. The vertical sliding groove I and vertical sliding groove II are symmetrically arranged on both sides of the central axis. The side of the housing (1) that contacts the fixed limiting block I (3) is side A. The side that contacts the fixed limiting block II is side B. A base plate (4) is fixedly installed on the worktable of side A of the box (1). The base plate (4) is attached to the side of the fixed limiting block I (3). A connecting seat (5) is fixedly installed on the base plate (4). A moving block (6) is installed on the connecting seat (5). A single-axis motor II (13) is fixedly installed on the top of the moving block (6). A rotating rod (7) is fixedly installed at the output end of the single-axis motor II (13). A splicing block (8) is fixedly installed at the end of the rotating rod (7). An installation component (9) is installed at the end of the splicing block (8). The fixed assembly (2) includes a dual-axis motor (201), worm gear I, worm gear II (203), threaded rod I, threaded rod II (204), sliding rod I (205), sliding rod II, and pressing block (206). A second cavity is provided at the top center of the housing (1). The dual-axis motor (201) is fixedly installed in the second cavity. The two output shafts of the dual-axis motor (201) are A' output shaft and B' output shaft, respectively. A transmission rod I is fixedly installed at the end of the A' output shaft of the dual-axis motor (201). A worm gear I (202) is fixedly installed at the end of the transmission rod I. The threaded rod I is vertically installed in the vertical slide groove I. The top end of the threaded rod I is rotatably connected to the top wall of the housing (1) directly above the vertical slide groove I. The worm gear I is fixedly installed at the top of the threaded rod I. The worm gear I (202) meshes with the worm gear I for transmission. The sliding rod I (205) The bottom of the threaded rod I is threadedly connected to the top of the sliding rod I (205) within the vertical slide groove I; the output shaft of the dual-shaft motor (201) B' is fixedly equipped with a transmission rod II, and the end of the transmission rod II is fixedly equipped with a worm gear II. The threaded rod II (204) is vertically installed within the vertical slide groove II, and the top of the threaded rod II (204) is rotatably connected to the top wall of the box (1) directly above the vertical slide groove II. The worm gear II (203) is fixedly installed at the top of the threaded rod II (204), and the worm gear II and the worm gear II (203) mesh and drive each other. The sliding rod II is slidably installed within the vertical slide groove II, and the bottom of the threaded rod II is threadedly connected to the sliding rod II. The extrusion block (206) is fixedly installed at the bottom of the sliding rod I (205) and the sliding rod II. The rock sample is placed in the first cavity of the box (1), and the extrusion block (206) is located directly above the rock sample. The installation component (9) includes a drill bit (901), and the splicing block (8) has a insertion cavity in the center. The drill bit (901) is horizontally fixed in the insertion cavity of the splicing block (8).

2. The experimental apparatus for simulating rockburst according to claim 1, characterized in that: The mounting assembly (9) also includes a plug-in block (903), a threaded rod III (905), and a rotating wheel (19). The splicing block (8) has two limiting cavities perpendicular to the plug-in cavity, symmetrically distributed on both sides of the plug-in cavity. The limiting cavities communicate with the plug-in cavity. The plug-in block (903) is located within the limiting cavities. The two opposite sides of the plug-in block (903) are side A” and side B”, respectively. A threaded sleeve (904) is fixedly installed on side A” of the plug-in block (903). A limiting through hole communicating with the limiting cavity is opened on the outer wall of the splicing block (8). A ball bearing shaft is fixedly installed within the limiting through hole. The threaded section of threaded rod III (905) is horizontally inserted into the limiting cavity. The end of the threaded section of threaded rod III (905) is threadedly connected to the threaded sleeve (904) on the A” side of the plug block (903). The smooth section of threaded rod III (905) passes outward through the inner ring of the ball bearing shaft and extends to the outside of the splicing block (8). The wheel (19) is fixedly set at the end of the smooth section of threaded rod III (905). The end side wall of drill bit (901) is symmetrically provided with slots. When the end of drill bit (901) is set in the plug cavity of splicing block 8, the B” side of plug block (903) is locked in the slot on the end side wall of drill bit (901).

3. The experimental apparatus for simulating rockburst according to claim 2, characterized in that: A guide groove is provided in the insertion cavity of the splicing block (8) along the axial direction. A positioning block (902) matching the guide groove is fixedly provided on the side wall of the drill bit (901). When the end of the drill bit (901) is placed in the insertion cavity of the splicing block (8), the positioning block (902) slides in the guide groove.

4. The experimental apparatus for simulating rockburst according to claim 1, characterized in that: The two ends of the connecting seat (5) are C end and D end respectively. A sliding groove is provided at the top of the connecting seat (5) along the direction from C end to D end. A limiting hole is provided on the inner wall of the sliding groove near the C end of the connecting seat (5). A third cavity is provided inside the D end of the connecting seat (5). A threaded through hole I communicating with the sliding groove is provided on the side wall of the third cavity. A single-axis motor I (10) is fixedly installed in the third cavity. A transmission rod III is fixedly installed at the output end of the single-axis motor I (10). A threaded rod IV (11) is fixedly installed at the end of the transmission rod III. The threaded rod IV (11) extends horizontally through the threaded through hole I on the side wall of the third cavity into the sliding groove. The end of the threaded rod IV (11) is a smooth end. The end of the threaded rod IV (11) is rotatably installed in the limiting hole. A horizontal threaded through hole II is provided at the bottom end of the moving block (6). The threaded rod IV (11) passes through the threaded through hole II and is threadedly connected to the threaded through hole II.

5. The experimental apparatus for simulating rockburst according to claim 4, characterized in that: The top of the moving block (6) has a fourth cavity, and the single-axis motor II (13) is fixedly installed in the fourth cavity. A horizontal through hole is opened on the side wall of the fourth cavity near the D end of the connecting seat (5). The two ends of the rotating rod (7) are the C' end and the D' end, respectively. The C' end of the rotating rod (7) passes through the horizontal through hole and is fixedly connected to the output shaft of the single-axis motor II (13). A limit ring (20) is fixedly installed at the D end of the connecting seat (5), and the D' end of the rotating rod (7) passes through the limit ring (20). The mounting assembly (9) is fixedly installed at the D' end of the rotating rod (7).

6. The experimental apparatus for simulating rockburst according to claim 4, characterized in that: The movable block (6) includes a movable horizontal part and a vertical slider (12). The movable horizontal part is fixedly installed at the top of the vertical slider (12). The vertical slider (12) is inserted into the groove at the top of the connecting seat (5). The threaded through hole II is opened at the bottom of the vertical slider (12). A roller (21) is provided at the bottom of the movable horizontal part. The roller (21) contacts the top surface of the connecting seat (5).

7. The experimental apparatus for simulating rockburst according to claim 1, characterized in that: The top of the box (1) is fixedly provided with a hanging seat, and the top of the hanging seat is fixedly provided with several hanging rings (14).

8. The experimental apparatus for simulating rockburst according to claim 1, characterized in that: The box body (1) is hinged to a door (15) on the side, and a handle (16) is fixedly installed on the door (15); a plug is fixedly installed on the side wall of the box body (1), and a protrusion is fixedly installed on the opening side of the door (15). Insertion holes are opened in both the plug and the protrusion, and a pin (17) is inserted into the insertion hole.

9. The experimental apparatus for simulating rockburst according to claim 1, characterized in that: An anti-slip pad (18) is fixedly provided at the bottom of the extrusion block (206).

10. The experimental apparatus for simulating rockburst according to claim 1, characterized in that: The inner wall of the top of the vertical slide groove I is provided with a rotation limiting groove I, and the worm gear I is set in the rotation limiting groove I; the inner wall of the top of the vertical slide groove II is provided with a rotation limiting groove II, and the worm gear II (203) is set in the rotation limiting groove I; the outer side of the sliding rod I (205) is symmetrically provided with a positioning protrusion I, the inner wall of the vertical slide groove I is vertically provided with a guide groove I, and the positioning protrusion I slides on the guide groove I; the outer side of the sliding rod II is symmetrically provided with a positioning protrusion II, the inner wall of the vertical slide groove II is vertically provided with a guide groove II, and the positioning protrusion II slides on the guide groove II.

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