Intermediate frequency disturbance continuous applying device under deep engineering hard rock true triaxial stress condition

Abstract

The invention provides an intermediate frequency disturbance continuous applying device for deep engineering hard rocks under true triaxial stress conditions, and relates to the technical field of deep rock mechanical tests, the intermediate frequency disturbance continuous applying device comprises a true triaxial excavation stress loading mechanism, a rack, a wheel disc type continuous transmitting device, an air pressure loading device, an intermediate frequency disturbance transmitting device and a control center; a rock sample is fixedly arranged in the true triaxial excavation stress loading mechanism; the rack is fixedly connected to one side of the true triaxial excavation stress loading mechanism; the wheel disc type continuous launching device is fixedly arranged in the middle of the rack; the air pressure loading device is fixedly arranged on the rack; the medium-frequency disturbance transmitting device comprises a medium-frequency disturbance transmitting rod and a transmitting rod track matched with the medium-frequency disturbance transmitting rod; the control center is electrically connected with the true triaxial excavation stress loading mechanism, the wheel disc type continuous launching device and the air pressure loading device. Through cooperative indexing rotation of the multiple pressure cavities of the wheel disc type continuous firing device and the driving motor and cooperation with opening and closing of the electric control bullet firing valve, continuous firing of bullets can be completed.

Description

Technical Field

[0001] The present invention relates to the technical field of deep rock mechanics testing, and in particular to a medium-frequency disturbance continuous application device under true triaxial stress conditions for deep engineering hard rocks. Background Art

[0002] Rock mechanics research relies on high-performance rock mechanics testing machines. The development of true triaxial rock mechanics testing machines for excavation stress conditions has been ongoing for many years, with the emergence of numerous new types. As this progresses, researchers have discovered that deep engineering sites are subject to a variety of dynamic disturbance sources, including dynamic loads from trains, dynamic disturbances from tunnel excavation, seismic waves, and other medium-frequency dynamic disturbances (0-500 Hz). Therefore, true triaxial rock mechanics testing machines are no longer limited to excavation stress loading; instead, they have been upgraded and modified to accommodate dynamic disturbance stress loading.

[0003] Most existing equipment relies on a Hopkinson bar (SHPB) to achieve high-frequency impact. However, due to its unique high amplitude and high frequency characteristics, high-frequency impact can cause brittle fracture of rock samples at the moment of impact. As for the application of medium-frequency disturbance, since the disturbance stress it applies has medium frequency and low amplitude characteristics, it is highly unlikely that the rock sample will experience brittle fracture instantly. Instead, it can be used to study the internal damage accumulation process of rock during continuous medium-frequency disturbance, which is more in line with the dynamic disturbance environment of deep engineering sites (multiple, continuous medium-frequency disturbances). However, there is a lack of dedicated medium-frequency disturbance loading devices. In addition, the existing pneumatic medium-frequency disturbance devices need to be manually recovered and reset after the bullet is fired, resulting in a long interval between each medium-frequency disturbance loading, making it difficult to simulate the fast and continuous disturbance process in actual engineering.

[0004] Based on the above shortcomings of the existing technology, there is an urgent need for a medium-frequency disturbance continuous application device under true triaxial stress conditions for deep engineering hard rock. Summary of the Invention

[0005] The purpose of the present invention is to provide a medium-frequency perturbation continuous application device under true triaxial stress conditions in deep engineering hard rock to improve the above-mentioned problems. To achieve the above-mentioned purpose, the technical solution adopted by the present invention is as follows: The present application provides a medium-frequency disturbance continuous application device under true triaxial stress conditions for deep engineering hard rock, comprising a true triaxial excavation stress loading mechanism, a frame, a disc-type continuous launcher, a pneumatic loading device, a medium-frequency disturbance launcher and a control center; a rock sample is fixedly arranged in the true triaxial excavation stress loading mechanism; the frame is fixedly connected to one side of the true triaxial excavation stress loading mechanism; the disc-type continuous launcher is fixedly arranged in the middle of the frame, and the disc-type continuous launcher includes a bullet; the pneumatic loading device is fixedly arranged on the frame, and the air path interface of the pneumatic loading device is connected to the air path interface of the disc-type continuous launcher; the medium-frequency disturbance launcher includes a medium-frequency disturbance launch rod and a matching launch rod track, the medium-frequency disturbance launch rod is coaxially arranged with the bullet, and the end of the medium-frequency disturbance launch rod away from the bullet faces the rock sample; the control center is electrically connected to the true triaxial excavation stress loading mechanism, the disc-type continuous launcher and the pneumatic loading device respectively.

[0006] Furthermore, the wheel-type continuous launching device includes an outer shell, a fixed outer disk, a rotatable inner disk, a pneumatic component, an electrically controlled bullet launching valve, a bullet and a driving motor. The outer shell is fixedly arranged on the frame, the fixed outer disk and the driving motor are respectively fixedly arranged on both sides of the outer shell, the rotatable inner disk and the fixed outer disk are coaxially nested structures, the transmission shaft of the driving motor passes through the center of the fixed outer disk and is fixedly connected to the rotatable inner disk, the rotatable inner disk has six cylindrical pressure chambers evenly distributed in an annular manner, the number of the pneumatic components is consistent with the number of the pressure chambers, the air circuit interfaces at both ends of each of the pneumatic components are respectively connected to the air circuit interface of the pneumatic loading device and the air circuit interface of the electrically controlled bullet launching valve, the air circuit interface at the other end of the electrically controlled bullet launching valve is connected to the pressure chamber, the electrically controlled bullet launching valve is electrically connected to the control center, the bullet is cylindrical, and the outer diameter of the bullet matches the inner diameter of the pressure chamber.

[0007] Furthermore, the electronically controlled bullet launching valve includes a lifting valve core, which is driven by electromagnetic force to move vertically in the electronically controlled bullet launching valve. When opened, an air pressure release channel is formed inside the fixed outer disk to connect the pressure chamber with the air circuit interface corresponding to the air pressure component. When closed, the pressure chamber is sealed.

[0008] Furthermore, the wheel-type continuous firing device also includes a bullet return limit assembly, which is a circular ring structure. The bullet return limit assembly is arranged between the rotatable inner disk and the medium-frequency disturbance firing device. The bullet return limit assembly is coaxially arranged with the pressure chamber, and the inner diameter of the bullet return limit assembly is larger than the outer diameter of the bullet.

[0009] Furthermore, the wheel-type continuous firing device also includes a laser position measuring device, which is fixedly arranged on the fixed outer disk, and the laser position measuring device is arranged above the bullet return limit assembly, and the measuring direction of the laser position measuring device is toward the bullet.

[0010] Furthermore, the roulette-type continuous launching device also includes an electromagnetic recovery component, which is fixedly arranged at the bottom of the pressure chamber. The electromagnetic recovery component is electrically connected to a power supply and generates electromagnetic force when powered on.

[0011] Furthermore, the pneumatic assembly includes an air pressure box, an air charging port and a bullet air pressure inlet and outlet. The air pressure box is fixedly used to store compressed air. The air pressure box is fixedly arranged on the fixed outer disk. The air pressure box includes three air paths. The first path is connected to the air path interface of the air pressure loading device through the air charging port, the second path is connected to the pressure chamber through the electronically controlled bullet launching valve, and the third path is connected to the external atmosphere through the bullet air pressure inlet and outlet.

[0012] Furthermore, the roulette-type continuous launching device also includes a pressure sensor, and the pressure sensor is arranged on the air pressure component.

[0013] Furthermore, the wheel-type continuous launching device also includes inner and outer disc slide rails, and the inner and outer disc slide rails are arranged between the fixed outer disc and the rotatable inner disc.

[0014] Furthermore, the driving motor is a stepping motor.

[0015] The beneficial effects of the present invention are: The present invention uses the coordinated indexing rotation of the multiple pressure chambers of the wheel-type continuous firing device and the drive motor, combined with the precise opening and closing of the electronically controlled bullet firing valve, to switch between different pressure chambers in sequence to complete continuous bullet firing, completely eliminating the loading interruption problem caused by the traditional device's reliance on manual bullet recovery, and significantly improving test efficiency; utilizing the electromagnetic recovery component's directional adsorption ability of bullets to achieve rapid automatic resetting of the bullet after firing, ensuring that the medium-frequency disturbance stress wave is stably output at a preset frequency, and avoiding operational errors introduced by manual intervention.

[0016] Other features and advantages of the present invention will be described in the following description, and in part will become apparent from the description, or understood by practicing the embodiments of the present invention. The purposes and other advantages of the present invention can be realized and obtained by the structures particularly pointed out in the written description, claims, and drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for use in the embodiments. It should be understood that the following drawings only illustrate certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without paying any creative work.

[0018] Figure 1 This is a schematic diagram of the structure of the medium-frequency disturbance continuous application device under true triaxial stress conditions for deep engineering hard rock described in this application; Figure 2 It is a structural schematic diagram of the roulette-type continuous launching device; Figure 3 It is a cross-sectional view of the wheel-type continuous launching device.

[0019] Markings in the figure: 1. True three-axis excavation stress loading mechanism; 2. Frame; 3. Wheel-disc continuous launching device; 31. Outer shell; 32. Fixed outer disk; 33. Rotatable inner disk; 34. Air pressure assembly; 341. Air pressure box; 342. Inflating port; 343. Bullet air pressure inlet and outlet; 344. Pressure sensor; 35. Electric bullet launching valve; 351. Lifting valve core; 352. Air pressure release channel; 36. Bullet; 37. Drive motor; 38. Pressure chamber; 39. Inner and outer disk slide rails; 4. Air pressure loading device; 5. Medium frequency disturbance launching device; 51. Medium frequency disturbance launching rod; 52. Launching rod track; 6. Control center; 7. Bullet return limit assembly; 8. Laser position measuring device; 9. Electromagnetic recovery assembly. DETAILED DESCRIPTION

[0020] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. The components of the embodiments of the present invention generally described and shown in the drawings herein can be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the present invention provided in the drawings is not intended to limit the scope of the claimed invention, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0021] It should be noted that similar reference numerals and letters represent similar items in the following drawings. Therefore, once an item is defined in one drawing, it does not need to be further defined or explained in subsequent drawings. At the same time, in the description of the present invention, the terms "first", "second", etc. are used only to distinguish the description and should not be understood as indicating or implying relative importance.

[0022] like Figure 1 As shown, Figure 1 The schematic diagram of the structure of the medium-frequency disturbance continuous application device under the true triaxial stress condition of deep engineering hard rock is shown, which includes a true triaxial excavation stress loading mechanism 1, a frame 2, a wheel-type continuous launch device 3, an air pressure loading device 4, a medium-frequency disturbance launch device 5 and a control center 6; a rock sample is fixedly arranged in the true triaxial excavation stress loading mechanism 1, and the true triaxial excavation stress loading mechanism 1 applies multi-directional stress to the rock sample to simulate the state of the surrounding rock of deep engineering; the frame 2 is fixedly connected to one side of the true triaxial excavation stress loading mechanism 1, and the frame 2 serves as the bearing body and adopts a high-strength steel welded structure to connect and fix other components; the wheel-type continuous launch device 3 is fixedly arranged in the middle of the frame 2, and the wheel-type continuous launch device 3 includes a bullet 36, and the multiple launch devices inside it realize the switching of the bullet 36 positions through a rotatable design, and cooperate with the air pressure loading device 4 to accurately Accurately control the air pressure in each cavity to drive the bullets 36 to be fired in sequence; the air pressure loading device 4 is fixedly arranged on the frame 2, and the air path interface of the air pressure loading device 4 is connected to the air path interface of the wheel-type continuous firing device 3; the intermediate frequency disturbance firing device 5 includes an intermediate frequency disturbance firing rod 51 and a matching firing rod track 52. The intermediate frequency disturbance firing rod 51 is coaxially arranged with the bullet 36. The end of the intermediate frequency disturbance firing rod 51 away from the bullet 36 is facing the rock sample. The intermediate frequency disturbance firing rod 51 converts the kinetic energy of the bullet 36 into a low-amplitude intermediate frequency stress wave and transmits it to the rock sample. The firing rod track 52 ensures the accuracy of the impact direction; the control center 6 is electrically connected to the true triaxial excavation stress loading mechanism 1, the wheel-type continuous firing device 3 and the air pressure loading device 4 respectively. The control center 6 realizes automated continuous loading, effectively simulating the progressive damage process of deep rock mass under continuous dynamic disturbance.

[0023] Preferably, if Figure 2 and Figure 3As shown, the wheel-type continuous firing device 3 includes a shell 31, a fixed outer disk 32, a rotatable inner disk 33, a pneumatic component 34, an electronically controlled bullet firing valve 35, a bullet 36 and a drive motor 37. The shell 31 is fixedly arranged on the frame 2 as a rigid support base, fixed to the middle of the frame 2 by bolts, and provides an installation reference for the internal components; the fixed outer disk 32 and the drive motor 37 are respectively fixedly arranged on both sides of the shell 31, and the fixed outer disk 32 is an annular disk body with a central opening; the rotatable inner disk 33 and the fixed outer disk 32 are coaxially nested structures, and the drive shaft of the drive motor 37 passes through the fixed outer disk. The center of 32 is fixedly connected to the rotatable inner disk 33, and the rotatable inner disk 33 has six cylindrical pressure chambers 38 evenly distributed in an annular shape. The number of pneumatic components 34 is consistent with the number of pressure chambers 38. The air circuit interfaces at both ends of each pneumatic component 34 are respectively connected to the air circuit interface of the air pressure loading device 4 and the air circuit interface of the electric-controlled bullet launching valve 35. The air circuit interface at the other end of the electric-controlled bullet launching valve 35 is connected to the pressure chamber 38. The electric-controlled bullet launching valve 35 is electrically connected to the control center 6. The bullet 36 is cylindrical, and the outer diameter of the bullet 36 matches the inner diameter of the pressure chamber 38, preferably with a clearance fit.

[0024] Specifically, the working principle of the roulette-type continuous firing device 3 is as follows: the roulette-type continuous firing device 3 drives the rotatable inner disk 33 to rotate indexed by the driving motor 37, so that the six cylindrical pressure chambers 38 evenly distributed in an annular shape are precisely aligned with the firing positions of the fixed outer disk 32 in turn; the air pressure loading device 4 fills the air pressure component 34 with compressed air through the air circuit interface, and the compressed air is introduced into the corresponding pressure chamber 38 through the air circuit interface of the electric-controlled bullet firing valve 35; the electric-controlled bullet firing valve 35 opens the valve core under the command of the control center 6, releasing the pressure in the pressure chamber 38 The high-pressure gas pushes the cylindrical bullet 36 to move at high speed along the axis of the cavity and hit the medium-frequency disturbance launching rod 51, wherein the rigid connection between the fixed outer disk 32 and the outer shell 31 ensures the stability of the launching position, and the fixed fit between the rotatable inner disk 33 and the drive shaft of the driving motor 37 realizes the position switching of the pressure cavity 38. The clearance fit design between the outer diameter of the bullet 36 and the inner diameter of the pressure cavity 38 maintains airtightness while ensuring the smooth movement of the bullet 36, thereby completing the continuous loading of the medium-frequency disturbance through the synergistic effect of air pressure loading, valve-controlled release and mechanical transmission.

[0025] Preferably, if Figure 3As shown, the electronically controlled bullet-firing valve 35 includes a lift valve core 351, which is electromagnetically driven to move vertically within the electronically controlled bullet-firing valve 35. When open, it forms a pressure release channel 352 inside the fixed outer disk 32, connecting the pressure chamber 38 with the corresponding air interface of the air pressure assembly 34. When closed, it seals the pressure chamber 38. Specifically, the electronically controlled bullet-firing valve 35 achieves pressure on / off by controlling the vertical movement of the lift valve core 351 through the electromagnetic driver: when the control center 6 triggers the electromagnetic drive, the lift valve core 351 moves vertically upward, forming a pressure release channel 352 inside the fixed outer disk 32, connecting the pressure chamber 38 with the air interface of the air pressure assembly 34, and instantly releasing high-pressure gas to propel the bullet 36 into flight. When the valve core is closed, the conical sealing surface at its bottom is compressed, ensuring the airtightness of the pressure chamber 38 during the inflation phase, and achieving precise release and reliable sealing of the high-pressure gas during the medium-frequency disturbance loading process.

[0026] Preferably, the roulette-type continuous firing device 3 further includes a bullet return stop assembly 7. The bullet return stop assembly 7 is a circular ring structure and is disposed between the rotatable inner disk 33 and the intermediate-frequency perturbation firing device 5. The bullet return stop assembly 7 is coaxially disposed with the pressure chamber 38, and the inner diameter of the bullet return stop assembly 7 is larger than the outer diameter of the bullet 36. During the recovery process of the bullet 36 after firing, the bullet return stop assembly 7 physically limits the radial deviation of the bullet 36 via the annular inner wall, ensuring that the bullet 36 accurately returns to the pressure chamber 38 along a predetermined path.

[0027] Preferably, the roulette-type continuous firing device 3 further includes a laser position measuring device 8, which is fixedly mounted on the fixed outer disc 32 and above the bullet return limit assembly 7. The measuring direction of the laser position measuring device 8 is toward the bullet 36. When the bullet 36 is attracted and returned to the cavity by the electromagnetic recovery assembly 9, the laser beam detects the reflected signal from the surface of the bullet 36 to determine whether the bullet 36 has completely returned to the preset position in the pressure cavity 38. The laser beam then feeds back the "bullet in place" status to the control center 6, triggering the operation of switching to the next workstation, thereby ensuring the continuity of the continuous firing process.

[0028] Preferably, the reel-type continuous firing device 3 also includes an electromagnetic recovery assembly 9, which is fixedly mounted at the bottom of the pressure chamber 38. The electromagnetic recovery assembly 9 is electrically connected to a power source and generates an electromagnetic force when energized. When the bullet 36 leaves the chamber after firing, the electromagnetic force acts on the magnetically conductive material at the rear of the bullet 36, rapidly drawing the bullet 36 back into the pressure chamber 38. This ensures that the bullet 36 returns to its initial position, providing reliable loading conditions for the next round of pressure loading.

[0029] Preferably, if Figure 2The pneumatic assembly 34 shown includes an air pressure box 341, an air charging port 342 and a bullet air pressure inlet-outlet 343. The air pressure box 341 is fixed for storing compressed air. The air pressure box 341 is fixedly arranged on the fixed outer disk 32. The air pressure box 341 includes three air paths. The first path is connected to the air path interface of the air pressure loading device 4 through the air charging port 342 for storing compressed air; the second path is connected to the pressure chamber 38 through the electronically controlled bullet launching valve 35, and releases high-pressure gas to drive the bullet 36 during launching; the third path is connected to the external atmosphere through the bullet air pressure inlet-outlet 343, which can be opened after the test is completed or when the equipment is out of use for a long time to completely discharge the residual gas in the pressure chamber 38 and the air path to avoid damage to the equipment.

[0030] Preferably, the roulette-type continuous firing device 3 further includes a pressure sensor 344, which is disposed on the pneumatic assembly 34. The pressure sensor 344 is used to monitor the pressure of the compressed air in the pneumatic box 341 in real time. When the pneumatic loading device 4 delivers gas to the pneumatic box 341 through the inflation port 342, the pressure sensor 344 feeds real-time data back to the control center 6, dynamically adjusting the air pump output pressure to ensure consistent inflation of each pressure chamber 38.

[0031] Preferably, the roulette-type continuous launching device 3 further includes inner and outer disc slide rails 39 , which are arranged between the fixed outer disc 32 and the rotatable inner disc 33 to achieve low-friction relative rotation between the inner and outer discs.

[0032] Preferably, the drive motor 37 is a stepper motor, which accurately controls the indexing rotation angle of the inner disk through the pulse signal sent by the control center 6. This achieves the reliability of high-frequency station switching under continuous emission conditions and the low maintenance requirements of long-term operation.

[0033] The foregoing description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Those skilled in the art will readily appreciate that various modifications and variations of the present invention are possible. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention are intended to be within the scope of protection of the present invention.

[0034] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any modifications or substitutions that can be easily conceived by a person skilled in the art within the technical scope disclosed in the present invention should be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be based on the scope of protection of the claims.

Claims

1. A medium-frequency disturbance continuous application device under true triaxial stress conditions for deep engineering hard rock, characterized in that: include: A true triaxial excavation stress loading mechanism (1), wherein a rock sample is fixedly arranged in the true triaxial excavation stress loading mechanism (1); A frame (2), the frame (2) being fixedly connected to one side of the true triaxial excavation stress loading mechanism (1); A roulette-type continuous firing device (3), the roulette-type continuous firing device (3) being fixedly arranged in the middle of the frame (2), the roulette-type continuous firing device (3) comprising a bullet (36); A pneumatic loading device (4), the pneumatic loading device (4) being fixedly arranged on the frame (2), the pneumatic circuit interface of the pneumatic loading device (4) being connected to the pneumatic circuit interface of the wheel-type continuous emission device (3); An intermediate frequency disturbance emission device (5), comprising an intermediate frequency disturbance emission rod (51) and a matching emission rod track (52), wherein the intermediate frequency disturbance emission rod (51) is coaxially arranged with the bullet (36), and an end of the intermediate frequency disturbance emission rod (51) away from the bullet (36) faces the rock sample; A control center (6) is electrically connected to the true three-axis excavation stress loading mechanism (1), the wheel-type continuous emission device (3) and the air pressure loading device (4).

2. The medium-frequency disturbance continuous application device under true triaxial stress conditions for deep engineering hard rock according to claim 1 is characterized in that: The wheel-type continuous firing device (3) comprises a housing (31), a fixed outer disc (32), a rotatable inner disc (33), an air pressure assembly (34), an electric-controlled bullet firing valve (35), bullets (36) and a driving motor (37); the housing (31) is fixedly arranged on the frame (2); the fixed outer disc (32) and the driving motor (37) are respectively fixedly arranged on both sides of the housing (31); the rotatable inner disc (33) and the fixed outer disc (32) are coaxially nested; the transmission shaft of the driving motor (37) passes through the center of the fixed outer disc (32) and is fixedly connected to the rotatable inner disc (33); The rotating inner disk (33) is annularly distributed with six cylindrical pressure chambers (38). The number of the pneumatic components (34) is consistent with the number of the pressure chambers (38). The air circuit interfaces at both ends of each of the pneumatic components (34) are respectively connected to the air circuit interface of the pneumatic loading device (4) and the air circuit interface of the electric-controlled bullet-launching valve (35). The air circuit interface at the other end of the electric-controlled bullet-launching valve (35) is connected to the pressure chamber (38). The electric-controlled bullet-launching valve (35) is electrically connected to the control center (6). The bullet (36) is cylindrical, and the outer diameter of the bullet (36) matches the inner diameter of the pressure chamber (38).

3. The medium-frequency disturbance continuous application device under true triaxial stress conditions for deep engineering hard rock according to claim 2 is characterized in that: The electric-controlled bullet-firing valve (35) includes a lifting valve core (351). The lifting valve core (351) moves vertically in the electric-controlled bullet-firing valve (35) through electromagnetic drive. When the lifting valve core (351) is opened, an air pressure release channel (352) is formed inside the fixed outer disk (32) to connect the pressure chamber (38) with the air path interface corresponding to the air pressure component (34). When the lifting valve core (351) is closed, the pressure chamber (38) is sealed.

4. The medium-frequency disturbance continuous application device under true triaxial stress conditions for deep engineering hard rock according to claim 2 is characterized in that: The wheel-type continuous firing device (3) further comprises a bullet return position limiting assembly (7), the bullet return position limiting assembly (7) being a circular ring structure, the bullet return position limiting assembly (7) being arranged between the rotatable inner disk (33) and the intermediate frequency disturbance firing device (5), the bullet return position limiting assembly (7) being coaxially arranged with the pressure chamber (38), and the inner diameter of the bullet return position limiting assembly (7) being larger than the outer diameter of the bullet (36).

5. The medium frequency disturbance continuous application device under true triaxial stress conditions for deep engineering hard rock according to claim 4 is characterized in that: The wheel-type continuous firing device (3) further comprises a laser position measuring device (8), wherein the laser position measuring device (8) is fixedly arranged on the fixed outer disk (32), the laser position measuring device (8) is arranged above the bullet return limit assembly (7), and the measuring direction of the laser position measuring device (8) is toward the bullet (36).

6. The medium-frequency disturbance continuous application device under true triaxial stress conditions for deep engineering hard rock according to claim 2 is characterized in that: The roulette-type continuous emission device (3) further comprises an electromagnetic recovery component (9), which is fixedly arranged at the bottom of the pressure chamber (38) and electrically connected to a power source to generate electromagnetic force when energized.

7. The medium-frequency disturbance continuous application device under true triaxial stress conditions for deep engineering hard rock according to claim 2 is characterized in that: The air pressure assembly (34) includes an air pressure box (341), an air charging port (342) and a bullet air pressure inlet and outlet (343). The air pressure box (341) is fixedly used to store compressed air. The air pressure box (341) is fixedly arranged on the fixed outer disk (32). The air pressure box (341) includes three air paths, the first path is connected to the air path interface of the air pressure loading device (4) through the air charging port (342), the second path is connected to the pressure chamber (38) through the electric-controlled bullet launching valve (35), and the third path is connected to the external atmosphere through the bullet air pressure inlet and outlet (343).

8. The medium frequency disturbance continuous application device under true triaxial stress conditions for deep engineering hard rock according to claim 2 is characterized in that: The roulette-type continuous emission device (3) further comprises a pressure sensor (344), and the pressure sensor (344) is arranged on the air pressure component (34).

9. The medium-frequency disturbance continuous application device under true triaxial stress conditions for deep engineering hard rock according to claim 2 is characterized in that: The wheel-type continuous launching device (3) further comprises inner and outer disk slide rails (39), wherein the inner and outer disk slide rails (39) are arranged between the fixed outer disk (32) and the rotatable inner disk (33).

10. The medium frequency disturbance continuous application device under true triaxial stress conditions for deep engineering hard rock according to claim 2, characterized in that: The driving motor (37) is a stepping motor.

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