A rock sample preparation device

Abstract

The rock sample preparation device comprises a sample preparation part, the sample preparation part comprises a moving frame, a coring mechanism and a polishing mechanism, the coring mechanism is arranged on the moving frame, the coring mechanism is used for obtaining a sample by secondary coring of a rock core, and the polishing part is used for polishing two ends of the sample; the coring mechanism comprises a second motor, a hollow drill bit, a cutting machine, a moving plate and a second electric sliding rail module, the hollow drill bit is rotatably arranged on the moving frame, and the second motor is fixedly arranged on the moving frame and used for driving the hollow drill bit to rotate. When the rock sample preparation device is used, the clamping mechanism can prevent the original cylindrical rock core from shaking, deviating or slipping during secondary coring, and can be adapted to original cylindrical rock cores with different outer diameters; through the coring mechanism and the polishing mechanism, the coaxiality and accuracy of secondary coring are ensured, the sample meets the test requirements, and a standard sample is provided for subsequent rock mechanics tests.

Description

Technical Field

[0001] This invention belongs to the field of rock mechanics testing technology, and in particular relates to a rock sample preparation device. Background Technology

[0002] Tunnel and roadway engineering projects rely heavily on the study of the mechanical properties of soil and rock. Because the tensile strength of rock is much lower than its compressive strength, geotechnical engineering accidents caused by tensile failure occur frequently. Therefore, the tensile strength of rock is a crucial parameter in the study of soil and rock mechanical properties. Direct tensile testing is difficult to perform in practice; internationally, the Brazilian splitting test is commonly used to test the tensile strength of rock. The Brazilian splitting test is convenient for specimen preparation and simple to operate, making it the most commonly used method for determining the tensile strength of rock. The test specimens require cylindrical original rock cores obtained from field drilling, which are then calibrated by secondary core sampling in the laboratory, cut to length, and leveled at the end faces to form standard short cylindrical specimens of Φ50mm×50mm conforming to ISRM standards. Currently, the industry generally uses separate sample preparation equipment and independent splitting test equipment to complete the test. Traditional sample preparation and testing processes have inherent technical defects, directly affecting the accuracy and data reliability of rock splitting tests.

[0003] In existing technologies, traditional secondary coring for sample preparation suffers from low precision and significant processing damage. Original cylindrical rock cores commonly exhibit slight skewness and uneven roundness. Traditional equipment uses rigid point clamping for positioning, which easily introduces eccentricity errors during secondary coring, making it difficult to meet standards for specimen coaxiality and end-face flatness. Furthermore, traditional high-speed cutting processes generate significant vibration and frictional heat, easily creating secondary micro-cracks and residual stress within the specimen. Conventional manual core removal methods can also damage the specimen's effective load-bearing structure, leading to non-standard splitting and tensile failures and large dispersion in experimental data.

[0004] Therefore, to solve the above problems, a rock mechanics testing device that can effectively improve the processing accuracy of specimens and reduce processing damage is needed. Summary of the Invention

[0005] In view of the shortcomings of the prior art described above, the purpose of this invention is to provide a rock sample preparation device to solve the technical problems of low precision and large processing damage in traditional secondary core sampling.

[0006] To achieve the above and other related objectives, the present invention provides a rock sample preparation apparatus, comprising: A frame and a workbench, wherein the frame is mounted on the workbench; A clamping mechanism, which is mounted on the frame, is used to clamp the rock core. The sample preparation unit includes a movable frame, a core sampling mechanism, and a grinding mechanism. The movable frame is movably mounted on the frame body via a first electric slide rail module. The core sampling mechanism is mounted on the movable frame and is used to perform secondary core sampling on rock cores to obtain samples. The grinding mechanism is used to grind both ends of the sample. The core sampling mechanism includes a second motor, a hollow drill bit, a cutting machine, a movable plate, and a second electric slide rail module. The hollow drill bit is rotatably mounted on the movable frame, and the axis of the hollow drill bit is horizontally set. The second motor is fixedly mounted on the movable frame and is used to drive the hollow drill bit to rotate. The second electric slide rail module is vertically fixedly mounted on the movable frame. The movable plate is mounted on the slider of the second electric slide rail module, and the cutting machine is fixedly mounted on the movable plate. The grinding mechanism is mounted on the frame and located on the side close to the sample feeding mechanism.

[0007] In this way, after the clamping mechanism clamps the original cylindrical rock core, the drill bit rotates at a low and uniform speed and feeds in a small amount axially. Compared with traditional high-speed drilling, the torsional shear force and vibration impact are greatly reduced. Through secondary coaxial coring, the ellipticity, deviation and surface defects of the rough rock core taken in the field are accurately calibrated. Then, the grinding mechanism is used to grind the end of the sample to produce a standard sample with uniform diameter and excellent coaxiality.

[0008] Optionally, the hollow drill bit includes a drill bit and a drill rod. The drill bit is coaxially mounted on one end of the drill rod, and the drill rod is rotatably mounted on the movable frame. The drill rod is driven to rotate by the second motor. The drill rod and the drill bit are coaxially provided with a through insertion hole. A limit frame is fixedly provided on the frame. An ejector rod is horizontally mounted on the limit frame via a linear bearing. The ejector rod is coaxially inserted into the insertion hole.

[0009] Optionally, a plurality of limit blocks are evenly spaced circumferentially on the inner wall of the drill bit near the insertion hole. An ejector block is fixedly mounted on one end of the ejector rod near the limit blocks. The ejector rod and the ejector block have a hollow T-shaped cross-section. The limit blocks are circumferentially distributed around the outer periphery of the ejector blocks. The drainage groove connects the interior of the ejector rod and the interior of the drill bit. A limit plate is fixedly mounted on the outer wall of the ejector rod, located between the drill rod and the limit frame. Optionally, the ejector block has several drainage grooves on the side facing the drill bit. These drainage grooves connect the interior of the ejector rod and the interior of the drill bit. A retractable hose is connected to the end of the ejector rod away from the drill bit. Using the ejector rod, coolant is directly released to the cutting area of ​​the drill bit, promptly removing frictional heat and preventing thermal damage to the rock and the expansion of surface micro-cracks.

[0010] Optionally, the grinding mechanism includes a third motor, an adjusting plate, a grinding disc, a drive rod, a drive shaft, a mounting shaft, and a second electric push rod. The third motor is mounted on the frame. A mounting plate is positioned downwards on the side of the frame closest to the sample feeding mechanism. The middle portion of the drive rod is rotatably mounted on the mounting plate via a rolling bearing. The third motor drives the drive rod to rotate. The adjusting plate is vertically oriented downwards, and its upper end is horizontally movable on the frame via a linear slide rail module. Two sets of adjusting plates and the second electric push rod are arranged in pairs, respectively positioned on the... On both sides of the mounting plate, the second electric push rod is horizontally mounted on the mounting plate, and the actuating end of the second electric push rod is fixedly connected to the adjusting plate. The mounting shaft and the drive shaft are both horizontally rotatably mounted on the adjusting plate via rolling bearings. The mounting shaft is located below the drive shaft, and there are meshing gears between the drive shaft and the mounting shaft. The drive shaft and the drive rod are coaxially arranged, and the drive shaft is splined into the drive rod. The grinding disc is mounted on the mounting shaft, and the grinding surface of the grinding disc faces the mounting plate. This symmetrical, coaxial, and parallel grinding disc structure allows for simultaneous micro-static pressure grinding of the upper and lower end faces of the cut rock core, and the grinding amount of each grinding disc can be controlled independently. It can remove cutting marks, end face burrs, and minor tilting defects, ensuring that the parallelism of the two end faces and the perpendicularity of the end face to the axis meet the test standards in one go, completely solving the problems of end face tilting and insufficient parallelism caused by traditional single-sided grinding and manual smoothing. The grinding process uses low-pressure, slow-speed grinding to reduce surface peeling and secondary damage.

[0011] Optionally, the clamping mechanism includes a first clamping plate, a second clamping plate, and a driving assembly. The first clamping plate is located between the sample preparation section and the second clamping plate. The first clamping plate is symmetrically arranged left and right, and the second clamping plate is symmetrically arranged top and bottom. The driving assembly drives the first clamping plate and the second clamping plate to move closer or further apart, thereby clamping or releasing the rock core. A symmetrical arc-shaped flexible circumferential clamping structure is adopted to accommodate raw cylindrical rock cores of different outer diameters in the field, preventing the raw cylindrical rock core from shaking, shifting, or slipping during processing.

[0012] Optionally, the drive assembly includes a fourth motor, a second bidirectional lead screw, a connecting shaft, a third bidirectional lead screw, a first clamping frame, and a second clamping frame. The fourth motor is fixedly mounted on the frame. The two ends of the second bidirectional lead screw are horizontally rotatably mounted on the frame via rolling bearings, located below the first clamping plate, and the axis of the second bidirectional lead screw is perpendicular to the axis of the hollow drill bit. The fourth motor drives the second bidirectional lead screw to rotate. The first clamping frames are symmetrically arranged on the second bidirectional lead screw. When the second bidirectional lead screw rotates, the first clamping frames move closer to or further away from each other on the second bidirectional lead screw. The first clamping plate is fixedly mounted on the opposite side of the first clamping frames. Through the synchronous movement of the first and second clamping frames, the axis of the original cylindrical rock core can be made collinear with the axis of the drill bit and drill rod, ensuring the coaxiality of the secondary coring.

[0013] Optionally, two third bidirectional lead screws are vertically symmetrically arranged, with their upper and lower ends rotatably mounted on the frame and the worktable respectively via rolling bearings. The second clamping frames are symmetrically arranged on the third bidirectional lead screws. When the third bidirectional lead screws rotate, the second clamping frames move closer to or further away from each other on the third bidirectional lead screws. The second clamping plate is fixedly installed on the opposite side of the second clamping frames.

[0014] Optionally, the connecting shaft is horizontally rotatably mounted on the worktable via rolling bearings, and the two ends of the connecting shaft have bevel gears that mesh with the second and third bidirectional lead screws. Through the meshing bevel gears, when the fourth motor drives the second bidirectional lead screw to rotate, it can simultaneously drive the third bidirectional lead screw to rotate.

[0015] Optionally, it also includes a guide frame and a tensioning rod. The lower side of the guide frame is fixedly installed on the worktable. The guide frame is inclined upward toward the movable frame. The upper side of the guide frame is located below the original cylindrical rock core and between the second bidirectional lead screw. The upper side of the guide frame also has a positioning block. The tensioning rod is screwed onto the frame body through a threaded connection. The axis of the tensioning rod is collinear with the axis of the drill rod and is located on the side of the original cylindrical rock core away from the drill bit. A tensioning plate is rotatably installed at the end of the tensioning rod near the original cylindrical rock core.

[0016] The beneficial effects of this invention are as follows: When using this invention, the clamping mechanism can prevent the original cylindrical rock core from shaking, shifting or slipping during the secondary coring process, and can adapt to original cylindrical rock cores with different outer diameters. Through the coring mechanism and grinding mechanism, the coaxiality and accuracy of the secondary coring are guaranteed, so that the sample meets the test requirements and provides a standard sample for subsequent rock mechanics tests. Attached Figure Description

[0017] Figure 1 The diagram shown is a schematic representation of the overall structure of the present invention.

[0018] Figure 2 Displayed as Figure 1 A structural diagram from another location.

[0019] Figure 3 The diagram shows the structure of the clamping mechanism.

[0020] Figure 4 The diagram shown is a structural schematic of the core extraction mechanism.

[0021] Figure 5 The diagram shows a cross-sectional view of the core extraction mechanism.

[0022] Figure 6 The diagram shown is a cross-sectional view of part of the core extraction mechanism.

[0023] Figure 7 The diagram shows the structure of the grinding mechanism.

[0024] Figure 8 The diagram shows the structure of the splitting test apparatus.

[0025] Figure 9 Displayed as Figure 8 A structural diagram from another location.

[0026] Figure 10 The diagram shows the sample delivery mechanism. Detailed Implementation

[0027] The following specific embodiments illustrate the implementation of the present invention. Those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification.

[0028] Please see Figures 1 to 5 It should be understood that the structures, proportions, sizes, etc., depicted in the accompanying drawings are merely for illustrative purposes to aid those skilled in the art and to facilitate understanding. They are not intended to limit the scope of the invention and therefore have no substantial technical significance. Any modifications to the structure, changes in proportions, or adjustments to size, without affecting the effectiveness and purpose of the invention, should still fall within the scope of the technical content disclosed herein. Furthermore, the terms "upper," "lower," "left," "right," "middle," and "one" used in this specification are merely for clarity and not intended to limit the scope of the invention. Changes or adjustments to their relative relationships, without substantially altering the technical content, should also be considered within the scope of the invention.

[0029] like Figure 1-5As shown, the original cylindrical rock core is cored a second time on the workbench 1 using the sample preparation device 2 to prepare a sample. After the sample is prepared, it is sent to the splitting test device 4 by the transfer mechanism 3, and then the splitting test is carried out to test the tensile strength of the sample. The sample preparation device 2, the transfer mechanism 3 and the splitting test device 4 are all set on the workbench 1. The transfer mechanism 3 is set on the lower side of the sample preparation device 2 and the splitting test device 4 to transfer the sample, so that the sample is automatically sent to the splitting test device 4 for testing after preparation. The process is simple and efficient, which improves the working efficiency of the test.

[0030] In this embodiment, the sample preparation device 2 includes a frame 21, a clamping mechanism 22, and a sample preparation section 23. The frame 21 is mounted on the workbench 1, and the clamping mechanism 22 and the sample preparation section 23 are mounted on the frame 21. The clamping mechanism 22 clamps the original cylindrical rock core along the horizontal direction of the axis, and then the sample preparation section 23 performs secondary core sampling to prepare a sample with a diameter and length that meet the test requirements.

[0031] In this embodiment, the clamping mechanism 22 includes a first clamping plate 221, a second clamping plate 222, and a driving component 223. When clamping the original cylindrical rock core, the first clamping plate 221 is clamped around the left and right sides of the original cylindrical rock core under the action of the driving component 223, located at one end of the original cylindrical rock core being cored. The second clamping plate 222 is clamped around the upper and lower sides of the original cylindrical rock core under the action of the driving component 223, located at the end away from the original cylindrical rock core being cored. The opposite sides of the first clamping plate 221 and the second clamping plate 222 are both arc-shaped and have flexible buffer bushings attached. When clamped, they fit against the outer arc surface of the original cylindrical rock core, avoiding rigid clamping and squeezing damage to the surface structure of the rock core, and can adaptively correct the slight eccentricity and tilt of the original cylindrical rock core.

[0032] Specifically, the drive assembly 223 includes a fourth motor 2231, a second bidirectional lead screw 2232, a connecting shaft 2233, a third bidirectional lead screw 2234, a first clamping frame 2235, and a second clamping frame 2236. The fourth motor 2231 is fixedly mounted on the frame 21. The two ends of the second bidirectional lead screw 2232 are rotatably mounted on the frame 21 through rolling bearings. The second bidirectional lead screw 2232 is horizontally positioned below the original cylindrical rock core, and its axis is perpendicular to the axis of the original cylindrical rock core. The output end of the fourth motor 2231 is connected to one end of the second bidirectional lead screw 2232. The second bidirectional screw 2232 is driven to rotate by the fourth motor 2231. The first clamping frame 2235 is symmetrically arranged at both ends of the second bidirectional screw 2232 by threaded engagement and is set vertically upward. The first clamping plate 221 is fixedly installed on the opposite side of the two first clamping frames 2235. The end of the first clamping frame 2235 away from the first clamping plate 221 is horizontally inserted and slidably engaged with the frame body 21. When the second bidirectional screw 2232 rotates, the first clamping frames 2235 move closer or further away from each other, thereby clamping or releasing the original cylindrical rock core on the left and right sides.

[0033] Specifically, the third bidirectional lead screw 2234 is vertically symmetrically arranged, with its upper and lower ends rotatably mounted between the frame 21 or the worktable 1 via rolling bearings, located on the left and right sides of the original cylindrical rock core. The second clamping frame 2236 is horizontally arranged and symmetrically positioned on the upper and lower sides of the original rock core, and is threaded onto the third bidirectional lead screw 2234. The two ends of the second clamping frame 2236 are respectively engaged with the third bidirectional lead screw 2234 on both sides of the original cylindrical rock core. The second clamping plate 222 is fixedly installed on the opposite side of the second clamping frame 2236. When the third bidirectional lead screw 2234 rotates, the second clamping frames 2236 move closer or further apart, thereby clamping or releasing the original cylindrical rock core on its upper and lower sides.

[0034] Specifically, the connecting shaft 2233 is horizontally rotatably mounted on the worktable 1 via rolling bearings, located between the second bidirectional lead screw 2232 and the third bidirectional lead screw 2234. Its axis is perpendicular to the axes of the second bidirectional lead screw 2232 and the third bidirectional lead screw 2234. Both ends of the connecting shaft 2233 have bevel gears 2237 that mesh with the second bidirectional lead screw 2232 and the third bidirectional lead screw 2234. Through the meshing bevel gears 2237, when the fourth motor 2231 drives the second bidirectional lead screw 2232 to rotate, it can simultaneously drive the third bidirectional lead screw 2234 to rotate, thereby simultaneously centering and clamping the original cylindrical rock core in different directions using the first clamping plate 221 and the second clamping plate 222.

[0035] After the original cylindrical rock core is clamped horizontally along its axis, a second core extraction is performed using the sample preparation unit 23.

[0036] In this embodiment, the sample preparation unit 23 includes a moving frame 231, a core sampling mechanism 232, and a grinding mechanism 233. The moving frame 231 is movably mounted on the frame body 21 via a first electric slide rail module 234. The moving direction of the moving frame 231 is the same as the axis direction of the original cylindrical rock core. The core sampling mechanism 232 is mounted on the moving frame 231, and the grinding mechanism 233 is mounted on the frame body 21, located between the moving frame 231 and the splitting test device 4. The core sampling mechanism 232 and the grinding mechanism 233 are used to obtain a sample whose diameter and length meet the test requirements.

[0037] Specifically, the core sampling mechanism 232 includes a second motor 2321, a drill rod 2322, a drill bit 2323, a cutter 2324, a moving plate 2325, and a second electric slide rail module 2326. The second motor 2321 is fixedly mounted on the moving frame 231. The drill rod 2322 is horizontally rotatably mounted on the moving frame 231 via rolling bearings, and the axis of the drill rod 2322 is collinear with the axis of the clamped original cylindrical rock core. There is a meshing gear 2327 between the output end of the second motor 2321 and the drill rod 2322, which drives the drill rod 2322 to rotate. The drill bit 2323 is a hollow drill bit, and the inner diameter of the front end of the drill bit 2323 matches the diameter of the sample. The drill bit 2323 is coaxially mounted on the end of the drill rod 2322 near the clamping mechanism 22. The movable slide rail module 2326 is vertically mounted on the movable frame 231, located above the drill bit 2323. The movable plate 2325 is fixedly mounted on the slider of the second electric slide rail module 2326. The cutting machine 2324 is fixedly mounted on the movable plate 2325. The second electric slide rail module 2326 drives the cutting machine 2324 to move downward. Under the action of the first electric slide rail module 234, the movable frame 231 moves towards the original cylindrical rock core. The second motor 2321 drives the drill bit 2323 to rotate, enabling the drill bit 2323 to drill into the original cylindrical rock core. After the drilling depth meets the requirements, the movable frame 231 retracts a certain distance to provide a margin for the cutting machine 2324 to cut off the original cylindrical rock core, making it easy to completely cut off one end of the original cylindrical rock core after secondary coring and detach it from the original cylindrical rock core.

[0038] Specifically, to facilitate the removal of the sample from inside the drill bit 2323, an ejector rod 2328 and a limiting frame 2329 are provided. The limiting frame 2329 is fixedly mounted on the frame 21, located on the side of the moving frame 231 away from the drill bit 2323. The ejector rod 2328 is horizontally mounted on the limiting frame 2329 via a linear bearing, coaxially arranged with the drill rod 2322. The drill rod 2322 and the drill bit 2323 are coaxially provided with a through insertion hole. The ejector rod 2328 is inserted into the insertion hole 23210. An ejector block 23211 is provided at the front end of the ejector rod 2328. The ejector rod 2328 and the ejector block 23211 have a T-shaped cross-section. Several limiting blocks 23212 are evenly spaced circumferentially on the inner wall of the drill bit 2323 near the insertion hole 23210. The limiting blocks 23212 are circumferentially distributed around the outer periphery of the ejector block 23211. When the moving frame 231 moves toward the original cylindrical rock core, it drives the ejector rod 2328 to move linearly on the limiting frame 2329. When the rock core abuts against the limiting block 23212, it does not contact the ejector block 23211. A limiting plate 23213 is fixedly installed on the outer wall of the ejector rod 2328. The limiting plate 23213 is located between the drill rod 2322 and the limiting frame 2329. After the cutting machine 2324 cuts the original cylindrical rock core, the moving frame 231 moves toward the side away from the clamping mechanism 22 under the action of the first electric slide rail module 234. The sample to be ground in the drill bit 2323 moves synchronously. After the limiting plate 23213 abuts against the limiting frame 2329, the ejector rod 2328 stops moving horizontally, and the moving frame 231 continues to move. The ejector block 23211 abuts against the sample to be ground until the sample to be ground is completely pushed out of the drill bit 2323.

[0039] Specifically, to promptly dissipate frictional heat and reduce thermal damage to the rock, the ejector rod 2328 and ejector block 23211 are hollow inside. The ejector block 23211 has several drainage grooves 23214 on the side facing the drill bit 2323. These drainage grooves connect the interior of the ejector rod 2328 and the interior of the drill bit 2323. A retractable hose 23215 is connected to the end of the ejector rod 2328 away from the drill bit 2323, through which a coolant pipe is connected. Additionally, a cooling water pipe 23216 is installed on the frame 21, spraying coolant towards the drilling and cutting areas.

[0040] In this embodiment, the cut specimen still needs to have its end face ground by the grinding mechanism 233 to remove cutting marks, end face burrs, and minor tilting defects. This ensures that the parallelism of both end faces and the perpendicularity of the end face to the axis meet the test standards in one go, solving the problems of end face tilting and insufficient parallelism caused by traditional single-sided grinding and manual grinding. The grinding process uses low-pressure, slow-speed grinding to prevent surface peeling and secondary damage.

[0041] Specifically, the grinding mechanism 233 includes a third motor 2331, an adjusting plate 2332, a grinding disc 2333, a drive rod 2334, a drive shaft 2335, a mounting shaft 2336, and a second electric push rod 2337. The third motor 2331 is fixedly mounted on the frame 21. The mounting plate 2338 is provided downwards on the side of the frame 21 closest to the splitting test device 4. The drive rod 2334 is rotatably mounted on the mounting plate 2338 and the frame 21 via rolling bearings, and one end is connected to the output end of the third motor 2331. Drive rod 2334 rotates. Adjusting plate 2332, drive shaft 2335, mounting shaft 2336, and grinding disc 2333 are arranged in pairs, each with two components, respectively positioned on both sides of mounting plate 2338. Adjusting plate 2332 is vertically downward, with its upper end horizontally movable on frame 21 via linear slide rail module 2339. The moving direction of adjusting plate 2332 is parallel to the axis of drill rod 2322. Second electric push rod 2337 is installed between adjusting plate 2332 and mounting plate 2338. The fixed end and the moving end are fixedly connected to the mounting plate 2338 and the adjusting plate 2332, respectively. The mounting shaft 2336 and the drive shaft 2335 are both horizontally rotatably mounted on the adjusting plate 2332 via rolling bearings. The mounting shaft 2336 is located below the drive shaft 2335. There are meshing gears 23310 between the drive shaft 2335 and the mounting shaft 2336. The two drive shafts 2335 are coaxially arranged with the drive rod 2334. The two drive shafts 2335 are slidably fitted onto the drive rod 2334 via spline insertion. The drive rod 2335 is located on the drive rod 2334. At both ends of 4, when the drive rod 2334 is driven to rotate by the third motor 2331, the two drive shafts 2335 can rotate with the drive rod 2334, and can also move along the axis of the drive rod 2334 with the adjustment plate 2332 under the action of the second electric push rod 2337. The grinding disc 2333 is installed on the opposite end of the mounting shaft 2336, with the grinding surfaces facing each other. When the drive shaft 2335 rotates, it drives the mounting shaft 2336 to rotate through the meshing gear 23310, thereby driving the grinding disc 2333 to rotate and grind the end face of the sample.

[0042] In this embodiment, the sample to be ground is transported to the grinding discs 2333 by the transfer mechanism 3, and then ground.

[0043] Specifically, the transfer mechanism 3 includes a third electric slide rail module 31, a third electric push rod 32, a clamping frame 33, and a gripper 34. The third electric slide rail module 31 is fixedly installed on the workbench 1, positioned below the drill bit 2323 and facing the grinding disc 2333 and the splitting test device 4. The sliding direction of the slider of the third electric slide rail module 31 is perpendicular to the axis of the drill rod 2322. The clamping frame 33 is fixedly installed on the slider of the third electric slide rail module 31. The third electric push rod 32 is vertically installed on the clamping frame 33, with its actuating end facing upwards. The gripper 34 is located at the top of the actuating end of the third electric push rod 32. The gripper 34 includes a fixed block 341 and a rotating block 342. Both the fixed block 341 and the rotating block 342 are arc-shaped plates with their curvature matching the curvature of the outer periphery of the sample. The fixed block 341 is horizontally fixedly installed at the top of the actuating end of the third electric push rod 32. After the sample is pushed out from inside the drill bit 2323, it falls onto the fixed block 341 and is supported by the fixed block 341. The rotating block 342 is symmetrically and rotatably mounted on the fixed block 341. The clamping frame 33 has a U-shaped clamping groove 331 above it. The fixed block 341 and the rotating block 342 can move downward and enter the clamping groove 331 through the third electric push rod 32. After the rotating block 342 is squeezed by the clamping groove 331, the top of the clamping groove 331 can push the two rotating blocks 342 to rotate upward. After the fixed block 341 and the rotating block 342 enter the clamping groove 331, the outer side of the rotating block 342 abuts against the inner wall of the clamping groove 331, and the inner side abuts against the outer periphery of the sample, thereby clamping the sample between the rotating block 342 and the fixed block 341. After clamping, it moves to the grinding disc 2333. The grinding disc 2333 moves toward the end face of the sample under the action of the second electric push rod 2337, and then grinding is performed.

[0044] In this embodiment, after the sample is ground, it is transported to the splitting test device 4 by the transfer mechanism 3 for tensile strength testing.

[0045] Specifically, the splitting test device 4 includes a test frame 41 and a test mechanism 42, a sample picking and feeding mechanism 43, and a sample positioning mechanism 44 set on the test frame 41. The test frame 41 is fixedly installed on the workbench 1 and has a test cavity 411 inside. The sample picking and feeding mechanism 43 is used to take the ground sample off the fixed block 341 and push it into the test cavity 411. After the sample is positioned at the sample positioning mechanism 44, the splitting test is performed using the test mechanism 42.

[0046] Specifically, the sample handling mechanism 43 includes a fixed frame 431, a support frame 432, and a first electric push rod 433. The fixed frame 431 is fixedly installed on one side of the test frame 41, located above the third electric slide rail module 31. The fixed frame 431 is hollow and its interior communicates with the test chamber 411. A limiting groove 4311 is provided on the lower side of the fixed frame 431, penetrating both the inside and outside of the fixed frame 431. The limiting groove 4311 is horizontally arranged along the axis of the drill rod 2322, and its width is greater than the diameter of the sample. The support frame 432 is rotatably installed inside the fixed frame 431 via a rotating shaft, and is spaced apart from the support frame 431. The support frame 432 is set on the upper side of the limiting groove 4311. The shortest distance between the support frames 432 is less than the diameter of the sample. The opposite side of the support frame 432 is inclined to the upper and outer side and has a mounting surface 4321. The mounting surface 4321 is linearly and uniformly rotated along the direction towards the test chamber 411 and has several auxiliary rollers 4322. The first electric push rod 433 is fixedly installed on the upper side of the fixed frame 431. The actuating end of the first electric push rod 433 is set in the direction away from the test chamber 411. The actuating end of the first electric push rod 433 is fixedly set with a push frame 4331, which is L-shaped. The sample moves to the bottom of the limiting groove 4311 under the action of the third electric slide rail module 31. The sample moves upward using the third electric push rod 32. During the movement, the sample moves out of the clamping groove 331. The rotating block 342 opens under its own weight. The sample passes through the limiting groove 4311 under the support of the fixed block 341 and contacts the lower side of the support frame 432. The sample lifts the support frame 432 and rotates it upward around the axis. Since the sample is a horizontally placed cylinder, when the horizontal cross section of the sample center exceeds the bottom of the support frame 432, the support frame 432 returns to its initial position without external force. Then the third electric push rod 32 retracts, and the sample moves downward. During the downward movement, it is stuck on the auxiliary roller 4322 between the support frames 432. Then the first electric push rod 433 drives the push frame 4331 to move towards the test chamber 411. The push frame 4331 abuts against one end of the sample. Then, under the action of the auxiliary roller 4322, it is quickly sent into the test chamber 411.

[0047] In this embodiment, the test mechanism 42 includes a pressure loading machine 421, an upper pressure plate 422, and a triangular column pad 423. The sample positioning mechanism 44 includes a positioning plate 441, a moving plate 442, a first motor 443, and a first bidirectional lead screw 444. The upper pressure plate 422 is vertically mounted on the test frame 41 via a linear slide rail module 424 and is located inside the test cavity 411. The triangular column pads 423 are respectively positioned on opposite sides of the bottom of the upper pressure plate 422 and the test cavity 411. The pressure loading machine 421 is fixedly mounted on the upper end of the test frame 41, and its output end is connected to the upper pressure plate 422, driving the upper pressure plate 422 to move downward within the test cavity 411. The first motor 443 is fixedly mounted on the test frame 41, and the first bidirectional lead screw 444 is horizontally mounted on the test frame 41 via rolling bearings and is located inside the test cavity 411. On the lower side, the first motor 443 drives the first bidirectional lead screw 444 to rotate. The moving plate 442 is vertically symmetrical and is set on the first bidirectional lead screw 444 through a threaded fit. When the first bidirectional lead screw 444 rotates, the symmetrically arranged moving plates 442 move closer to each other or further away. The upper side of the moving plate 442 is located in the test chamber 411. The prism pad 423 is located between the two moving plates 442. The upper side of the moving plate 442 is horizontally inserted and slidably fitted with a connecting rod 4421. The positioning plate 441 is fixedly installed on the end of the connecting rod 4421 near the prism pad 423. A spring 4422 is sleeved on the connecting rod 4421. The two ends of the spring 4422 are fixedly connected to the opposite side of the moving plate 442 and the positioning plate 441, respectively. The end of the positioning plate 441 near the fixing frame 431 is provided with a guide slope 4411 to facilitate the entry of the sample. After the sample enters the test chamber 411, the sample is supported on the lower prism pad 423 by the symmetrically arranged positioning plate 441. The upper pressure plate 422 is driven to move downward, so that the prism pad 423 below the upper pressure plate 422 abuts against the highest tangent of the sample. After the sample is fixed between the two prism pads 423, the positioning plate 441 is driven away from the sample by the first motor 443, and the splitting test can be started.

[0048] Specifically, it also has a guide frame 24, the lower side of which is fixedly installed on the worktable 1. The guide frame 24 is tilted upward toward the moving frame 231. The upper side of the guide frame 24 is located below the original cylindrical rock core and between the second bidirectional lead screw 2232. The upper side of the guide frame 24 also has a positioning block 241. Through the guide frame 24, the cut-off and discarded hollow cylinder slides out with the guide frame 24. The positioning block 241 can prevent the original cylindrical rock core from moving toward the drill bit 2323.

[0049] Specifically, a tensioning rod 25 is threaded onto the frame 21. The axis of the tensioning rod 25 is collinear with the axis of the drill rod 2322 and is located at the end of the original cylindrical rock core away from the drill bit 2323. A tensioning plate 251 is rotatably installed at the end of the tensioning rod 25 close to the original cylindrical rock core. By rotating the tensioning rod 25, the original cylindrical rock core can be restricted between the positioning block 241 and the tensioning plate 251 to prevent axial movement during the core extraction process. On the other hand, when performing the next core extraction, the original cylindrical rock core is pushed to the positioning block 241.

[0050] The above embodiments are merely illustrative of the principles and effects of the present invention and are not intended to limit the invention. Any person skilled in the art can modify or alter the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or alterations made by those skilled in the art without departing from the spirit and technical concept disclosed in the present invention should still be covered by the claims of the present invention.

Claims

1. A rock sample preparation apparatus, characterized in that, include: A frame and a workbench, wherein the frame is mounted on the workbench; A clamping mechanism, which is mounted on the frame, is used to clamp the rock core. The sample preparation unit includes a movable frame, a core sampling mechanism, and a grinding mechanism. The movable frame is movably mounted on the frame body via a first electric slide rail module. The core sampling mechanism is mounted on the movable frame and is used to perform secondary core sampling on rock cores to obtain samples. The grinding mechanism is used to grind both ends of the sample. The core sampling mechanism includes a second motor, a hollow drill bit, a cutting machine, a movable plate, and a second electric slide rail module. The hollow drill bit is rotatably mounted on the movable frame, and the axis of the hollow drill bit is horizontally set. The second motor is fixedly mounted on the movable frame and is used to drive the hollow drill bit to rotate. The second electric slide rail module is vertically fixedly mounted on the movable frame. The movable plate is mounted on the slider of the second electric slide rail module, and the cutting machine is fixedly mounted on the movable plate. The polishing mechanism is mounted on the frame.

2. The rock sample preparation apparatus according to claim 1, characterized in that: The hollow drill bit includes a drill bit and a drill rod. The drill bit is coaxially mounted on one end of the drill rod, and the drill rod is rotatably mounted on the movable frame. The drill rod is driven to rotate by the second motor. The drill rod and the drill bit are coaxially provided with a through insertion hole. A limit frame is fixedly provided on the frame. An ejector rod is horizontally mounted on the limit frame through a linear bearing. The ejector rod is coaxially inserted into the insertion hole.

3. The rock sample preparation apparatus according to claim 2, characterized in that: A plurality of limit blocks are evenly spaced around the inner wall of the drill bit near the insertion hole. An ejector block is fixedly installed at one end of the ejector rod near the limit block. The ejector rod and the ejector block are hollow T-shaped in cross-section. The limit blocks are distributed around the outer periphery of the ejector block. The drainage groove connects the interior of the ejector rod and the interior of the drill bit. A limit plate is fixedly installed on the outer wall of the ejector rod. The limit plate is located between the drill rod and the limit frame.

4. The rock sample preparation apparatus according to claim 3, characterized in that: The ejector block has several drainage grooves on the side facing the drill bit. The drainage grooves connect the inside of the ejector rod and the inside of the drill bit. The end of the ejector rod away from the drill bit is connected to a retractable hose.

5. The rock sample preparation apparatus according to claim 1, characterized in that: The grinding mechanism includes a third motor, an adjusting plate, a grinding disc, a drive rod, a drive shaft, a mounting shaft, and a second electric push rod. The third motor is mounted on the frame, and a mounting plate is provided on one side of the frame facing downwards. The middle part of the drive rod is rotatably mounted on the mounting plate via a rolling bearing. The third motor is used to drive the drive rod to rotate. The adjusting plate is vertically downwards, and its upper end is horizontally movable on the frame via a linear slide rail module. Two sets of adjusting plates and the second electric push rod are provided in pairs, respectively located on both sides of the mounting plate. The second electric push rod is horizontally mounted on the mounting plate, and its actuating end is fixedly connected to the adjusting plate. The mounting shaft and the drive shaft are both horizontally rotatably mounted on the adjusting plate via rolling bearings. The mounting shaft is located below the drive shaft, and there are meshing gears between the drive shaft and the mounting shaft. The drive shaft is coaxial with the drive rod and is splined into the drive rod. The grinding disc is mounted on the mounting shaft, and the grinding surface of the grinding disc faces the mounting plate.

6. The rock sample preparation apparatus according to claim 1, characterized in that: The clamping mechanism includes a first clamping plate, a second clamping plate, and a driving assembly. The first clamping plate is located between the sample preparation section and the second clamping plate. The first clamping plate is symmetrically arranged from left to right, and the second clamping plate is symmetrically arranged from top to bottom. The driving assembly drives the first clamping plate and the second clamping plate to move closer to or further away from each other, thereby clamping or releasing the rock core.

7. The rock sample preparation apparatus according to claim 6, characterized in that: The drive assembly includes a fourth motor, a second bidirectional lead screw, a connecting shaft, a third bidirectional lead screw, a first clamping frame, and a second clamping frame. The fourth motor is fixedly mounted on the frame. The two ends of the second bidirectional lead screw are horizontally rotatably mounted on the frame via rolling bearings, located below the first clamping plate, and the axis of the second bidirectional lead screw is perpendicular to the axis of the hollow drill bit. The fourth motor drives the second bidirectional lead screw to rotate. The first clamping frames are symmetrically arranged on the second bidirectional lead screw. When the second bidirectional lead screw rotates, the first clamping frames move closer to or further away from each other on the second bidirectional lead screw. The first clamping plate is fixedly mounted on the opposite side of the first clamping frame.

8. The rock sample preparation apparatus according to claim 7, characterized in that: Two third bidirectional lead screws are vertically and symmetrically arranged, with their upper and lower ends rotatably mounted on the frame and the worktable respectively via rolling bearings. The second clamping frames are symmetrically arranged on the third bidirectional lead screws. When the third bidirectional lead screws rotate, the second clamping frames move closer to or further away from each other on the third bidirectional lead screws. The second clamping plate is fixedly installed on the opposite side of the second clamping frames.

9. The rock sample preparation apparatus according to claim 7, characterized in that: The connecting shaft is horizontally rotatably mounted on the worktable via rolling bearings, and the two ends of the connecting shaft have bevel gears that mesh with the second and third bidirectional lead screws. Through the meshing bevel gears, when the fourth motor drives the second bidirectional lead screw to rotate, it can simultaneously drive the third bidirectional lead screw to rotate.

10. The rock sample preparation apparatus according to claim 7, characterized in that: It also includes a guide frame and a tensioning rod. The lower side of the guide frame is fixedly installed on the worktable. The guide frame is inclined upward toward the moving frame. The upper side of the guide frame is located below the original cylindrical rock core and between the second bidirectional lead screw. The upper side of the guide frame also has a positioning block. The tensioning rod is screwed onto the frame body by a threaded connection. The axis of the tensioning rod is collinear with the axis of the drill rod and is located on the side of the original cylindrical rock core away from the drill bit. A tensioning plate is rotatably installed at the end of the tensioning rod near the original cylindrical rock core.

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