A rock multi-field coupling fatigue performance testing machine and its system

Abstract

The present invention relates to the technical field of rock performance testing, and proposes a rock multi-field coupling fatigue performance testing machine and a system thereof, including a rock multi-field coupling fatigue performance testing machine, which is characterized in that it includes a main body, a pressure detection mechanism, a transfer mechanism and a centering mechanism. The pressure detection mechanism is installed on one side of the main body. By setting structures such as a sliding cylinder and a top pressure cylinder, and by using a combination of a sliding cylinder, a top pressure cylinder and a servo motor, diversified pressure application to the rock is achieved, and whether it is uniform top pressure at both ends, precise point pressure, or pressure extrusion around, it can be easily achieved. At the same time, the coordinated use of a water pump and a hard nozzle provides a real water flow flushing environment for the rock, further simulates the stress condition of the rock in actual application, and improves the accuracy and practicality of the test. Through the above technical solution, the problems of single experimental effect and insufficient accuracy in the existing technology are solved.

Description

Technical Field

[0001] The present invention relates to the technical field of rock performance testing, and in particular to a rock multi-field coupling fatigue performance testing machine and a system thereof. Background Art

[0002] At present, the rock multi-field coupling fatigue performance testing machine is a high-precision physical performance testing instrument specially used to study the fatigue performance of rocks under complex environmental conditions.

[0003] Existing rock testing facilities have many limitations in rock performance testing, making it difficult to accurately assess the multi-field coupled fatigue performance of rocks in complex geological environments. Traditional testing equipment is often only capable of single-dimensional pressure testing, ignoring the multiple physical field couplings to which rocks are subjected in actual environments, such as stress, seepage, temperature, and chemical corrosion. This single-dimensional testing approach results in significant deviations from actual conditions and fails to accurately reflect the long-term stability and fatigue life of rocks under complex conditions. Furthermore, existing testing facilities have a low degree of automation during rock positioning, transportation, and testing, relying on manual operation. This is not only inefficient but also prone to human error. Rock positioning and centering often require manual adjustment, which is time-consuming and labor-intensive, and positioning accuracy is difficult to guarantee. During transportation, rock clamping and movement also lack precise control, which can easily lead to rock damage or positional displacement, affecting the accuracy of test results. Summary of the Invention

[0004] The present invention proposes a rock multi-field coupling fatigue performance testing machine and a system thereof, which solves the problems of single experimental effect and insufficient accuracy in related technologies.

[0005] The technical solution of the present invention is as follows: A rock multi-field coupling fatigue performance testing machine and a system thereof, comprising a rock multi-field coupling fatigue performance testing machine, characterized in that it comprises a main body, a pressure detection mechanism, a transfer mechanism, and a centering mechanism, wherein the pressure detection mechanism is installed on one side of the main body, the transfer mechanism is installed in the middle of the main body, and the centering mechanism is installed on the other side of the main body;

[0006] The pressure detection mechanism includes a rotating motor and two sliding cylinders. The rotating motor is installed on the top of the main body. The output end of the rotating motor is connected to a coaxial rotating screw through a coupling. Two symmetrically arranged limit rods are fixedly connected to the interior of the main body. A circular frame is movably sleeved on the rotating screw and the limit rods. A circular scanner is installed on the inner wall of the circular frame.

[0007] The two sliding cylinders are respectively installed on the top and bottom of the main body, the output end of the sliding cylinder is installed with a sliding shaft, the bottom of the sliding shaft is fixedly connected with a top pressure frame, the inside of the top pressure frame is installed with a top pressure cylinder, the output end of the top pressure cylinder is installed with a top pressure shaft, the bottom of the top pressure shaft is installed with a hard nozzle mounting plate, the top of the hard nozzle mounting plate is installed with a water storage tank, the top of the water storage tank is fixedly connected with two symmetrically arranged water inlet pipes, and a water pump is installed on the water inlet pipe.

[0008] As a preferred solution of the present invention, a servo motor is installed inside the top pressure frame, and four circumferentially evenly distributed rotating shafts are rotatably installed inside the top pressure frame, one of the rotating shafts is connected to the output end of the servo motor through a coupling, and a meshing gear is fixedly sleeved on the outer circumference of the rotating shaft, and a rotating circular frame is rotatably installed inside the main body, and an internal gear is fixedly connected to the inner wall of the rotating circular frame, and the four meshing gears are all meshed with the internal gear, and the internal sliding assembly of the top pressure frame is equipped with four circumferentially evenly distributed meshing limit racks, and the four meshing limit racks are respectively meshed with the four meshing gears, and one end of the meshing limit rack is fixedly connected to a pressure plate.

[0009] As a preferred solution of the present invention, the bottom of the top pressure frame is provided with a plurality of holes and grooves distributed in an array at equal intervals, the bottom of the hard nozzle mounting plate is installed with a plurality of hard nozzles distributed in an array at equal intervals, and a plurality of the hard nozzles respectively pass through the interior of a plurality of the holes and grooves, and a plurality of auxiliary balls evenly distributed around the circumference are rotatably installed inside the rotating circular frame.

[0010] As a preferred solution of the present invention, the transfer mechanism includes a connecting frame and a rotating motor, the connecting frame is fixedly connected to the top of the main body, the rotating motor is installed on the top of the connecting frame, the output end of the rotating motor is connected to a coaxially arranged rotating shaft through a coupling, the bottom of the rotating shaft is fixedly connected to the transfer frame, the top of the transfer frame is installed with a screw motor, the output end of the screw motor is connected to a coaxially arranged rotating screw through a coupling, two symmetrically arranged limiting shafts are fixedly connected to the interior of the transfer frame, and a sliding frame is jointly sleeved on the outer circumference of the rotating screw and the limiting shaft, a transmission motor is installed on one side of the sliding frame, and the output end of the transmission motor is connected to a coaxially arranged double-screw shaft through a coupling, and two symmetrically arranged clamping blocks are movably sleeved on the double-screw shaft.

[0011] As a preferred solution of the present invention, the centering mechanism includes a synchronous motor and four limit sliders, the synchronous motor is installed inside the main body, the output end of the synchronous motor is connected to a coaxially arranged transmission shaft through a coupling, a circular plate is installed on the top of the transmission shaft, the top of the circular plate is movably hinged with four circumferentially evenly distributed hinged rods, the four limit sliders are circumferentially evenly distributed slidingly assembled inside the main body, the top of the limit slider is fixedly connected to a centering plate, and the limit slider and the hinged rod are hinged to each other.

[0012] A system of a rock multi-field coupling fatigue performance testing machine,

[0013] S1: Rock positioning and centering:

[0014] S11: Place the rock in the middle of the centering mechanism;

[0015] S12: Start the synchronous motor to drive the circular plate to rotate through the transmission shaft, thereby driving the articulated rod and the limit slider to move, thereby achieving the center positioning of the rock;

[0016] S2: Rock Transfer:

[0017] S21: Start the screw motor in the transfer mechanism to drive the rotating screw to rotate, so that the sliding frame descends to the middle of the rock;

[0018] S22: Start the transmission motor to drive the double screw shaft to rotate, so that the two clamping blocks move toward the rock and clamp the rock;

[0019] S23: Start the screw motor again to lift the rock and move it away from the centering mechanism;

[0020] S24: starting the rotating motor to transfer the rock to the middle of the pressure detection mechanism;

[0021] S25: Starting the transmission motor again to lower the rock onto the top pressure frame of the pressure detection mechanism;

[0022] S26: separating the clamping block from the rock and moving the clamping block to the top of the rock;

[0023] S27: The rotating motor works to move the clamping block away from the pressure detection mechanism;

[0024] S3: Pressure application and water flushing:

[0025] S31: Start the sliding cylinder to move the top pressure frame to both ends of the rock;

[0026] S32: Start the sliding cylinder, top pressure cylinder or servo motor according to the demand:

[0027] S33: Sliding cylinder: applies pressure to both ends of the rock;

[0028] S34: Top pressure cylinder: drives the top pressure shaft to slide, so that the hard nozzle can press the rock in a point-like manner; or retracts the top pressure cylinder, starts the water pump, and flushes the rock through the hard nozzle;

[0029] S35: Servo motor: drives the rotating shaft and the internal gear to rotate, and applies pressure to the surrounding areas of the rock through the meshing gears and the meshing limit racks;

[0030] S4: Multi-dimensional test:

[0031] S41: During the pressure application and water flushing process, the rotating motor is started to drive the rotating screw to rotate, so that the circular frame slides and the rock is scanned in multiple dimensions through the circular scanner.

[0032] As a preferred embodiment of the present invention:

[0033] The detection formula is:

[0034] 1.1. Rock compressive strength formula:

[0035]

[0036] Where p is the compressive strength, P is the pressure applied to the rock, A is the area of ​​the rock under load, and the compressive strength is expressed in megapascals (MPa);

[0037] 2. Formula for characteristic value of rock foundation bearing capacity:

[0038] f a =ψ r ·f rk

[0039] Among them, f a is the characteristic value of rock foundation bearing capacity, f rk is the standard value of the saturated uniaxial compressive strength of rock, ψ r is the reduction factor, which is determined based on the integrity of the rock mass and the spacing, width, occurrence and combination of structural planes;

[0040] 3. Scour force formula:

[0041] F=ρ·A·V·C f

[0042] Among them, F is the scouring force, ρ is the density of water, A is the contact area between water flow and rock, V is the water flow velocity, C f The scouring coefficient is the magnitude of the scouring force, which depends on the speed, density and contact area of ​​the water flow.

[0043] The working principle and beneficial effects of the present invention are:

[0044] 1. The present invention realizes diversified pressure application on the rock through the arrangement of structures such as sliding cylinders, top pressure cylinders, and the combined use of sliding cylinders, top pressure cylinders, and servo motors. Whether it is uniform top pressure at both ends, precise point pressure, or pressure extrusion on all sides, it can be easily achieved. At the same time, the coordinated use of water pumps and hard nozzles provides a real water flow flushing environment for the rock, further simulating the stress conditions of the rock in actual applications, and improving the accuracy and practicality of the test.

[0045] 2. The present invention adopts the arrangement of structures such as synchronous motors and screw motors, and drives the centering mechanism through the synchronous motor, so as to accurately position the rock in the center position and ensure the accuracy of subsequent tests. The transfer mechanism is cleverly designed, and the cooperation of the screw motor and the transmission motor realizes the rapid clamping, lifting and transfer of the rock, which greatly improves the test efficiency. At the same time, the precise control during the transfer process ensures that the rock will not be damaged during the transfer process, providing a stable foundation for subsequent pressure tests and scour tests. BRIEF DESCRIPTION OF THE DRAWINGS

[0046] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0047] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0048] Figure 2 This is the overall structural diagram of the pressure detection mechanism of the present invention;

[0049] Figure 3 This is a schematic diagram of the transmission structure of the rotary motor of the present invention;

[0050] Figure 4 This is a schematic diagram of the servo motor transmission structure of the present invention;

[0051] Figure 5 This is a schematic diagram of the bottom structure of the rigid nozzle mounting plate of the present invention;

[0052] Figure 6 Schematic diagram of the overall structure of the transfer mechanism of the present invention;

[0053] Figure 7 It is a schematic diagram of the overall structure of the centering mechanism of the present invention.

[0054] In the figure: 1. pressure detection mechanism; 11. main body; 12. rotating motor; 121. rotating screw; 122. limiting rod; 123. circular frame; 124. circular scanner; 13. sliding cylinder; 131. sliding shaft; 132. top pressure frame; 14. top pressure cylinder; 141. top pressure shaft; 142. water storage tank; 143. rigid nozzle mounting plate; 144. water inlet pipe; 145. water pump; 15. servo motor; 151. rotating shaft; 152. meshing gear; 153. meshing limiting rack; 154. pressure plate; 155. rotating circular frame; 156. internal gear; 157. auxiliary ball bearing;

[0055] 2. Transfer mechanism; 21. Connecting frame; 22. Rotating motor; 221. Rotating shaft; 222. Transfer frame; 23. Screw motor; 231. Rotating screw; 232. Limiting shaft; 24. Sliding frame; 241. Transmission motor; 242. Double screw shaft; 243. Clamping block;

[0056] 3. Centering mechanism; 31. Synchronous motor; 311. Drive shaft; 312. Circular plate; 32. Articulated rod; 321. Limiting slider; 322. Centering plate. DETAILED DESCRIPTION

[0057] The following will be combined with the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative efforts are within the scope of protection of the present invention.

[0058] Example 1

[0059] like Figures 1 to 7 As shown, a rock multi-field coupling fatigue performance testing machine includes a main body 11, a pressure detection mechanism 1, a transfer mechanism 2, and a centering mechanism 3. The pressure detection mechanism 1 is installed on one side of the main body 11, the transfer mechanism 2 is installed in the middle of the main body 11, and the centering mechanism 3 is installed on the other side of the main body 11;

[0060] The pressure detection mechanism 1 includes a rotating motor 12 and two sliding cylinders 13. The rotating motor 12 is mounted on the top of the main body 11. The output end of the rotating motor 12 is connected to a coaxial rotating screw 121 via a coupling. Two symmetrically arranged limiting rods 122 are fixedly connected to the interior of the main body 11. A circular frame 123 is movably sleeved on the rotating screw 121 and the limiting rods 122. A circular scanner 124 is mounted on the inner wall of the circular frame 123.

[0061] The two sliding cylinders 13 are respectively installed at the top and bottom of the main body 11. The output end of the sliding cylinder 13 is installed with a sliding shaft 131. The bottom of the sliding shaft 131 is fixedly connected with a top pressure frame 132. The inside of the top pressure frame 132 is installed with a top pressure cylinder 14. The output end of the top pressure cylinder 14 is installed with a top pressure shaft 141. The bottom of the top pressure shaft 141 is installed with a hard nozzle mounting plate 143. The top of the hard nozzle mounting plate 143 is installed with a water storage tank 142. The top of the water storage tank 142 is fixedly connected with two symmetrically arranged water inlet pipes 144, and a water pump 145 is installed on the water inlet pipe 144.

[0062] like Figures 1 to 5 As shown, a servo motor 15 is installed inside the top pressure frame 132, and four rotating shafts 151 with uniform circumference are rotatably installed inside the top pressure frame 132. One of the rotating shafts 151 is connected to the output end of the servo motor 15 through a coupling, and a meshing gear 152 is fixedly sleeved on the outer circumference of the rotating shaft 151. A rotating circular frame 155 is rotatably installed inside the main body 11, and an internal gear 156 is fixedly connected to the inner wall of the rotating circular frame 155. The four meshing gears 152 are all meshed with the internal gear 156. The interior of the top pressure frame 132 is slidingly equipped with four meshing limit racks 153 with uniform circumference. The four meshing limit racks 153 are respectively meshed with the four meshing gears 152, and one end of the meshing limit rack 153 is fixedly connected to a pressure plate 154.

[0063] like Figures 1 to 5 As shown, the bottom of the top pressure frame 132 is provided with a plurality of holes and grooves distributed evenly in an array, the bottom of the hard nozzle mounting plate 143 is installed with a plurality of hard nozzles distributed evenly in an array, and the plurality of hard nozzles pass through the interior of the plurality of holes and grooves respectively, and the interior of the rotating circular frame 155 is rotatably installed with a plurality of auxiliary balls 157 evenly distributed around the circumference.

[0064] In this embodiment, after the rock moves to between the two top pressure frames 132, the two sliding cylinders 13 are started synchronously. The start of the sliding cylinder 13 causes the sliding shaft 131 to move, and the movement of the sliding shaft 131 causes the top pressure frame 132 to move to the two ends of the rock. Subsequently, the sliding cylinder 13, the top pressure cylinder 14 or the servo motor 15 are started according to demand. The start of the sliding cylinder 13 causes the top pressure frames 132 on both sides to move, and the pressure is applied to the two ends of the rock. The start of the top pressure cylinder 14 causes the top pressure frame 132 to move to the two ends of the rock. The shaft 141 slides, and the sliding of the top pressure shaft 141 causes the hard nozzles distributed in an array at equal distances to press against the rocks in a point-like manner. The top pressure cylinder 14 can also be retracted. After retraction, the water pump 145 is turned on. The water pump 145 sends water to the water storage tank 142 through the water inlet pipe 144 and the external water tank. The water storage tank 142 sends water to the hard nozzles, and then the water is sent out from the hard nozzles to flush the rocks. The start of the servo motor 15 causes one of the rotating shafts 151 to rotate. This rotating shaft The rotation of 151 causes one of the meshing gears 152 to rotate, and the rotation of this meshing gear 152 drives the internal gear 156 to rotate. The rotation of the internal gear 156 causes the other three meshing gears 152 to rotate synchronously. When the internal gear 156 rotates, it is assisted in rotation by the auxiliary ball 157 on the rotating circular frame 155. When the four meshing gears 152 rotate synchronously, they drive the four meshing limit racks 153 to move synchronously toward the four sides of the rock, exerting pressure on the four sides of the rock. During the process of various pressure extrusions and water flushing on the rock, the rotating motor 12 is turned on, and the rotation of the rotating motor 12 causes the rotating screw 121 to rotate. The rotation of the rotating screw 121 causes the circular frame 123 to slide, and the sliding limit rod 122 of the circular frame 123 limits it. During the sliding process of the circular frame 123, the circular scanner 124 on the circular frame 123 scans the rock during the extrusion and water pressure flushing process, thereby realizing multi-dimensional testing of the rock.

[0065] Example 2

[0066] like Figure 6As shown, the transfer mechanism 2 includes a connecting frame 21 and a rotating motor 22. The connecting frame 21 is fixedly connected to the top of the main body 11, and the rotating motor 22 is installed on the top of the connecting frame 21. The output end of the rotating motor 22 is connected to a coaxially arranged rotating shaft 221 through a coupling. The bottom of the rotating shaft 221 is fixedly connected to the transfer frame 222. The top of the transfer frame 222 is installed with a screw motor 23. The output end of the screw motor 23 is connected to a coaxially arranged rotating screw 231 through a coupling. Two symmetrically arranged limiting shafts 232 are fixedly connected to the interior of the transfer frame 222. A sliding frame 24 is jointly sleeved on the outer circumference of the rotating screw 231 and the limiting shaft 232. A transmission motor 241 is installed on one side of the sliding frame 24. The output end of the transmission motor 241 is connected to a coaxially arranged double-screw shaft 242 through a coupling. Two symmetrically arranged clamping blocks 243 are movably sleeved on the double-screw shaft 242.

[0067] like Figure 7 As shown, the centering mechanism 3 includes a synchronous motor 31 and four limit sliders 321. The synchronous motor 31 is installed inside the main body 11. The output end of the synchronous motor 31 is connected to a coaxially arranged transmission shaft 311 through a coupling. A circular plate 312 is installed on the top of the transmission shaft 311. The top of the circular plate 312 is movably hinged with four circumferentially evenly distributed articulated rods 32. The four limit sliders 321 are circumferentially evenly distributed slidingly assembled inside the main body 11. The top of the limit slider 321 is fixedly connected to the centering plate 322, and the limit slider 321 and the articulated rod 32 are hinged to each other.

[0068] In this embodiment, before rock detection, the rock to be detected is first placed in the middle of the centering mechanism 3. After the rock is placed, the synchronous motor 31 is turned on. The start of the synchronous motor 31 causes the transmission shaft 311 to rotate. The rotation of the transmission shaft 311 causes the circular plate 312 to rotate. The rotation of the circular plate 312 causes the four hinged rods 32 to slide at an angle. When the hinged rods 32 slide at an angle, they drive the limit slider 321 to slide toward the center position of the circular plate 312. During the sliding process of the limit slider 321, the limit slider 321 is rotated. The limit of block 321 slides the sliding position of the limit slider 321, so that the centering plate 322 moves to the center position of the centering mechanism 3, thereby centering the position of the rock. After the center positioning is completed, the transfer mechanism 2 is turned on, and the screw motor 23 in the transfer mechanism 2 is started first. The rotation of the screw motor 23 causes the rotating screw rod 231 to rotate, and the rotation of the rotating screw rod 231 causes the sliding frame 24 to descend. The sliding frame 24 descends to the middle position of the rock. At this time, the transmission motor 241 is turned on, and the transmission motor 241 is turned on. The start of the machine 241 causes the double screw shaft 242 to rotate. The double screw shaft 242 has two screw shafts with opposite screw directions. When the double screw shaft 242 rotates, the two clamping blocks 243 move toward the rock position to clamp the rock. After the clamping is completed, the rotation of the screw motor 23 is turned on, so that the rock leaves the centering mechanism 3. After the rock leaves the centering mechanism 3, the rotating motor 22 is turned on. The start of the rotating motor 22 causes the rotating shaft 221 to drive the transfer frame 222 to rotate, and the transfer frame 22 2 rotates so that the rock moves to the middle of the pressure detection mechanism 1. At this time, the transmission motor 241 is turned on again to make the rock descend and place the rock on the top pressure frame 132 of the lower half of the pressure detection mechanism 1. Then the transmission motor 241 is turned on to separate the clamping block 243 from the rock. Then the screw motor 23 is turned on to move the clamping block 243 to the top of the rock. At this time, the rotating motor 22 is turned on to rotate the clamping block 243 away from the pressure detection mechanism 1, so that the position of the rock is placed more accurately.

[0069] A system of a rock multi-field coupling fatigue performance testing machine, characterized in that:

[0070] S1: Rock positioning and centering:

[0071] S11: placing the rock in the middle of the centering mechanism 3;

[0072] S12: Start the synchronous motor 31 to drive the circular plate 312 to rotate via the transmission shaft 311, thereby driving the hinge rod 32 and the limit slider 321 to move, thereby achieving the center positioning of the rock;

[0073] S2: Rock Transfer:

[0074] S21: Start the screw motor 23 in the transfer mechanism 2 to drive the rotating screw 231 to rotate, so that the sliding frame 24 descends to the middle of the rock;

[0075] S22: Start the transmission motor 241 to drive the double-screw shaft 242 to rotate, so that the two clamping blocks 243 move toward the rock and clamp the rock;

[0076] S23: Start the screw motor 23 again to lift the rock and move it away from the centering mechanism 3;

[0077] S24: Start the rotary motor 22 to transfer the rock to the middle of the pressure detection mechanism 1;

[0078] S25: Starting the transmission motor 241 again to lower the rock onto the top pressure frame 132 of the pressure detection mechanism 1;

[0079] S26: Separate the clamping block 243 from the rock and move the clamping block 243 to the top of the rock;

[0080] S27: The rotating motor 22 works to move the clamping block 243 away from the pressure detection mechanism 1;

[0081] S3: Pressure application and water flushing:

[0082] S31: Start the sliding cylinder 13 to move the top pressure frame 132 to both ends of the rock;

[0083] S32: Start the sliding cylinder 13, the pressing cylinder 14 or the servo motor 15 as required:

[0084] S33: Sliding cylinder 13: applies pressure to both ends of the rock;

[0085] S34: The top pressure cylinder 14 drives the top pressure shaft 141 to slide, so that the hard nozzle applies point pressure to the rock; or the top pressure cylinder 14 is retracted, and the water pump 145 is started to flush the rock through the hard nozzle;

[0086] S35: The servo motor 15 drives the rotating shaft 151 and the internal gear 156 to rotate, and applies pressure to the rock through the meshing gear 152 and the meshing limit rack 153;

[0087] S4: Multi-dimensional test:

[0088] S41: During the pressure application and water flushing process, the rotating motor 12 is started to drive the rotating screw 121 to rotate, so that the circular frame 123 slides, and the circular scanner 124 performs a multi-dimensional scan on the rock.

[0089] Specifically, a system of a rock multi-field coupling fatigue performance testing machine is characterized by:

[0090] The detection formula is:

[0091] 3. Rock compressive strength formula:

[0092]

[0093] Where p is the compressive strength, P is the pressure applied to the rock, A is the area of ​​the rock under load, and the compressive strength is expressed in megapascals (MPa);

[0094] 4. Formula for characteristic value of rock foundation bearing capacity:

[0095] f a =ψ r ·f rk

[0096] Among them, f a is the characteristic value of rock foundation bearing capacity, f rk is the standard value of the saturated uniaxial compressive strength of rock, ψ r is the reduction factor, which is determined based on the integrity of the rock mass and the spacing, width, occurrence and combination of structural planes;

[0097] 3. Scour force formula:

[0098] F=p·A·V·C f

[0099] Among them, F is the scouring force, ρ is the density of water, A is the contact area between water flow and rock, V is the water flow velocity, C f The scouring coefficient is the magnitude of the scouring force, which depends on the speed, density and contact area of ​​the water flow.

[0100] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A rock multi-field coupling fatigue performance testing machine, characterized in that: The device comprises a main body (11), a pressure detection mechanism (1), a transfer mechanism (2), and a centering mechanism (3), wherein the pressure detection mechanism (1) is installed on one side of the main body (11), the transfer mechanism (2) is installed in the middle of the main body (11), and the centering mechanism (3) is installed on the other side of the main body (11); The pressure detection mechanism (1) comprises a rotating motor (12) and two sliding cylinders (13), wherein the rotating motor (12) is mounted on the top of the main body (11), and the output end of the rotating motor (12) is connected to a coaxially arranged rotating screw (121) via a coupling, and two symmetrically arranged limiting rods (122) are fixedly connected to the interior of the main body (11), and a circular frame (123) is movably sleeved on the rotating screw (121) and the limiting rod (122), and a circular scanner (124) is mounted on the inner wall of the circular frame (123); The two sliding cylinders (13) are respectively installed at the top and bottom of the main body (11); the output end of the sliding cylinder (13) is installed with a sliding shaft (131); the bottom of the sliding shaft (131) is fixedly connected with a top pressure frame (132); a top pressure cylinder (14) is installed inside the top pressure frame (132); the output end of the top pressure cylinder (14) is installed with a top pressure shaft (141); the bottom of the top pressure shaft (141) is installed with a hard nozzle mounting plate (143); the top of the hard nozzle mounting plate (143) is installed with a water storage tank (142); the top of the water storage tank (142) is fixedly connected with two symmetrically arranged water inlet pipes (144); a water pump (145) is installed on the water inlet pipe (144).

2. A rock multi-field coupling fatigue performance testing machine according to claim 1, characterized in that: A servo motor (15) is installed inside the top pressure frame (132), and four rotating shafts (151) are evenly distributed on the circumference of the internal rotation of the top pressure frame (132), one of the rotating shafts (151) is connected to the output end of the servo motor (15) through a coupling, and a meshing gear (152) is fixedly sleeved on the outer circumference of the rotating shaft (151). A rotating circular frame (155) is rotatably installed inside the main body (11). An internal gear (156) is fixedly connected to the inner wall of the moving circular frame (155), and the four meshing gears (152) are all meshed with the internal gear (156). The internal sliding assembly of the top pressure frame (132) is equipped with four meshing limit racks (153) evenly distributed on the circumference, and the four meshing limit racks (153) are respectively meshed with the four meshing gears (152). One end of the meshing limit rack (153) is fixedly connected to a pressure plate (154).

3. A rock multi-field coupling fatigue performance testing machine according to claim 2, characterized in that: The bottom of the top pressure frame (132) is provided with a plurality of arrays of equally spaced hole slots, the bottom of the hard nozzle mounting plate (143) is provided with a plurality of arrays of equally spaced hard nozzles, the plurality of hard nozzles respectively pass through the interiors of the plurality of the hole slots, and the interior of the rotating circular frame (155) is rotatably provided with a plurality of auxiliary balls (157) evenly distributed around the circumference.

4. A rock multi-field coupling fatigue performance testing machine according to claim 3, characterized in that: The transfer mechanism (2) comprises a connecting frame (21) and a rotating motor (22), wherein the connecting frame (21) is fixedly connected to the top of the main body (11), and the rotating motor (22) is installed on the top of the connecting frame (21). The output end of the rotating motor (22) is connected to a coaxially arranged rotating shaft (221) through a coupling, and the bottom of the rotating shaft (221) is fixedly connected to the transfer frame (222). A screw motor (23) is installed on the top of the transfer frame (222), and the output end of the screw motor (23) is connected to the coaxially arranged rotating shaft (221) through a coupling. A coaxially arranged rotating screw (231) is connected, and two symmetrically arranged limiting shafts (232) are fixedly connected to the interior of the transfer frame (222). A sliding frame (24) is sleeved on the outer circumference of the rotating screw (231) and the limiting shaft (232). A transmission motor (241) is installed on one side of the sliding frame (24). The output end of the transmission motor (241) is connected to a coaxially arranged double-screw shaft (242) through a coupling, and two symmetrically arranged clamping blocks (243) are movably sleeved on the double-screw shaft (242).

5. The rock multi-field coupling fatigue performance testing machine according to claim 4, characterized in that: The centering mechanism (3) comprises a synchronous motor (31) and four limiting sliders (321), wherein the synchronous motor (31) is installed inside the main body (11), and the output end of the synchronous motor (31) is connected to a coaxially arranged transmission shaft (311) through a coupling, a circular plate (312) is installed on the top of the transmission shaft (311), and the top of the circular plate (312) is movably hinged with four circumferentially evenly distributed hinged rods (32), and the four limiting sliders (321) are circumferentially evenly distributed and slidingly assembled inside the main body (11), and the top of the limiting slider (321) is fixedly connected to the centering plate (322), and the limiting slider (321) and the hinged rod (32) are hinged to each other.

6. The system of a rock multi-field coupling fatigue performance testing machine according to claim 5, characterized in that: S1: Rock positioning and centering: S11: placing the rock in the middle of the centering mechanism (3); S12: Starting the synchronous motor (31), driving the circular plate (312) to rotate via the transmission shaft (311), thereby driving the hinge rod (32) and the limit slider (321) to move, thereby achieving center positioning of the rock; S2: Rock Transfer: S21: Start the screw motor (23) in the transfer mechanism (2) to drive the rotating screw (231) to rotate, so that the sliding frame (24) descends to the middle of the rock; S22: starting the transmission motor (241) to drive the double-screw shaft (242) to rotate, so that the two clamping blocks (243) move toward the rock and clamp the rock; S23: Start the screw motor (23) again to lift the rock and move it away from the centering mechanism (3); S24: starting the rotary motor (22) to transfer the rock to the middle of the pressure detection mechanism (1); S25: Starting the transmission motor (241) again to lower the rock onto the top pressure frame (132) of the pressure detection mechanism (1); S26: Separate the clamping block (243) from the rock and move the clamping block (243) to the top of the rock; S27: The rotating motor (22) operates to move the clamping block (243) away from the pressure detection mechanism (1); S3: Pressure application and water flushing: S31: Start the sliding cylinder (13) to move the top pressure frame (132) to both ends of the rock; S32: Start the sliding cylinder (13), the top pressure cylinder (14) or the servo motor (15) according to the requirements: S33: Sliding cylinder (13): applies pressure to both ends of the rock; S34: the top pressure cylinder (14): drives the top pressure shaft (141) to slide, so that the hard nozzle performs point-like pressure on the rock; or retracts the top pressure cylinder (14), starts the water pump (145), and flushes the rock through the hard nozzle; S35: The servo motor (15) drives the rotating shaft (151) and the internal gear (156) to rotate, and applies pressure to the surrounding of the rock through the meshing gear (152) and the meshing limit rack (153); S4: Multi-dimensional test: S41: During the pressure application and water flushing process, the rotating motor (12) is started to drive the rotating screw (121) to rotate, so that the circular frame (123) slides, and the rock is scanned in multiple dimensions by the circular scanner (124).

7. The rock multi-field coupling fatigue performance testing machine system according to claim 6 is characterized in that: The detection formula is:

1. Rock compressive strength formula: Where p is the compressive strength, P is the pressure applied to the rock, A is the area of ​​the rock under load, and the compressive strength is expressed in megapascals (MPa); 2. Formula for characteristic value of rock foundation bearing capacity: f a =ψ r ·f rk Among them, f a is the characteristic value of rock foundation bearing capacity, f rk is the standard value of saturated uniaxial compressive strength of rock, ψ r is the reduction factor, which is determined based on the integrity of the rock mass and the spacing, width, occurrence and combination of structural planes; 3. Scour force formula: F=ρ·A·V·C f Among them, F is the scouring force, ρ is the density of water, A is the contact area between water flow and rock, V is the water flow velocity, C f The scour coefficient is the magnitude of the scour force, which depends on the speed, density and contact area of ​​the water flow.

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