Apparatus and method for preparing rock body samples with different layering and bed inclination angles

Abstract

This invention discloses an apparatus and method for preparing rock mass samples with different bedding and dip angles. The apparatus includes a base, a test chamber, swing arms, an angle adjustment frame, a drilling device, a positioning and correction device, and an electrical control unit. The test chamber is positioned above the base. Two swing arms are symmetrically arranged on the front and rear sides of the test chamber, each equipped with a swing arm drive mechanism and a braking mechanism. The angle adjustment frame is longitudinally arranged between the two swing arms, with its two ends adjustablely and fixedly connected to each swing arm. The drilling device includes a servo motor, a threaded drill rod, and a drill bit. The servo motor is mounted on the angle adjustment frame, and its output shaft is a hollow shaft. The threaded drill rod passes through the hollow shaft, and the drill bit is installed at the lower end of the threaded drill rod. The positioning and correction device includes two N-shaped frames, with a positioning plate and a correction plate between them. This invention allows for multi-angle sampling from the top and sides of the rock mass model, flexibly adjusting the drilling angle to ensure accuracy and consistency, resulting in high sampling efficiency.

Description

Technical Field

[0001] This invention relates to the field of rock mass sample processing technology, specifically to an apparatus and method for preparing rock mass samples containing different bedding and dip angles. Background Technology

[0002] Anisotropy is a typical mechanical characteristic of layered rock masses (such as shale and slate) and one of the main research directions in rock mechanics and engineering. Unlike general rock masses, layered rock masses exhibit significant anisotropic deformation and strength, and their failure mechanisms are more complex. Engineering accidents caused by the instability of layered rock masses occur frequently, resulting in economic losses. Therefore, research on the mechanical properties of layered rock masses is of significant practical importance. To study the anisotropic mechanical characteristics of layered rock masses, it is necessary to drill layered rock mass samples with different bedding angles and further grind them into standard samples. Standard samples are cylindrical, cuboid, or cubic, and a series of physical, mechanical, and permeability tests are then conducted. Therefore, it is crucial to prepare layered rock mass samples with different bedding angles in the laboratory.

[0003] Naturally layered rocks collected on-site vary in size and exhibit significant dispersion, failing to adequately meet the requirements of laboratory testing. Currently, the molds used for rock sample preparation and drilling are relatively limited, resulting in low drilling efficiency and angle accuracy, poor stability and continuity during drilling, and cumbersome and labor-intensive procedures. Therefore, existing rock sampling equipment cannot meet the needs of practical applications. Based on this situation, a solution is needed for the preparation and drilling of similar material samples from layered rock masses. Summary of the Invention

[0004] In view of the shortcomings of the prior art, one objective of the present invention is to provide an apparatus for preparing rock mass samples with different bedding and dip angles, thereby solving the problems of low drilling efficiency and drilling angle accuracy, poor stability and continuity during drilling, and cumbersome operation procedures and high workload.

[0005] An apparatus for preparing rock samples with different bedding and dip angles includes a base, a test chamber, a swing arm, an angle adjustment frame, a drilling device, a positioning and correction device, and an electrical control unit. The test chamber is a square box with an open top and detachable left and right sides. The test chamber is mounted on the base via two guide rails, and each of its four bottom corners is equipped with an adjustable foot.

[0006] There are two swing arms, symmetrically arranged on the outside of the two guide rails. The lower end of each swing arm is rotatably connected to the base through a hinge support. Each of the two hinge supports is equipped with a swing arm drive mechanism on the opposite side. The two swing arm drive mechanisms drive the two swing arms to move synchronously. Each swing arm drive mechanism is equipped with a braking mechanism on one side that can fix the swing arm on the same side.

[0007] The upper middle part of the swing arm is provided with a slider seat that can be adjusted and fixed thereto. The angle adjustment frame is arranged horizontally between the two swing arms, and its front and rear ends are respectively rotatably connected to the two slider seats. The two slider seats are provided with a first locking block on the opposite side of each other to fix the angle adjustment frame to the slider seat.

[0008] The drilling device includes a motor mounting bracket, a servo motor, a threaded drill rod, and a drill bit. The motor mounting bracket is mounted on an angle adjustment bracket and is fixedly connected to it in an adjustable manner in terms of their relative front and rear positions. The servo motor is fixed to the top of the motor mounting bracket, and its output shaft is a hollow shaft.

[0009] The threaded drill rod is slidably inserted inside the hollow shaft. The lower part of the motor mounting bracket is provided with a threaded nut seat that cooperates with the threaded drill rod. The lower end of the threaded drill rod passes through the threaded nut seat and is detachably and fixedly connected to the upper end of the drill bit. The servo motor drives the drill bit to rotate and move along its axial direction through the threaded drill rod.

[0010] The positioning and correction device includes two N-shaped frames that can be detachably installed on the front and rear sides of the test chamber. A positioning plate and a correction plate are provided between the two N-shaped frames. The front and rear ends of the positioning plate and the correction plate are slidably engaged with the top and left and right sides of the two N-shaped frames through a square slider.

[0011] In addition, the front and rear ends of the positioning plate and the correction plate are rotatably connected to the corresponding square sliders. The two square sliders on the front N-shaped frame are equipped with second locking blocks, which fix the positioning plate or correction plate to the corresponding square sliders.

[0012] Furthermore, the test chamber includes a bottom plate, a front side plate, a rear side plate, a left side plate, and a right side plate. The lower ends of the front side plate and the rear side plate are fixedly connected to the bottom plate. The left side plate and the right side plate are vertically arranged between the front side plate and the rear side plate. The front and rear ends of the left side plate and the right side plate are respectively inserted and fixedly connected to the opposite side walls of the front side plate and the rear side plate.

[0013] The front side wall of the rear side panel has two T-shaped grooves arranged on the left and right, and the rear side wall of the front side panel has two identical T-shaped grooves that correspond one-to-one with the position of the rear side panel.

[0014] Both the front and rear ends of the left and right side plates are equipped with long strip-shaped T-shaped sliders integrated with them. Each T-shaped slider slides in conjunction with the corresponding T-shaped groove. The left and right ends of the front and rear side plates extend out of the outer wall of the left or right side plate.

[0015] Furthermore, the guide rail has a square cross-section, and two guide rails are arranged laterally parallel on the base. The surface of the guide rail has multiple rollers arranged at intervals along its length.

[0016] A limiting plate is fixedly provided at the bottom of the test chamber. The front and rear sides of the limiting plate are slidably engaged with the side walls of the two guide rails. A horizontal ruler is arranged horizontally on the front side of the bottom plate, and a horizontal ruler is arranged vertically on the right side of the limiting plate.

[0017] Furthermore, each swing arm has a first rotating shaft fixed at its lower end. The two first rotating shafts are arranged coaxially and are rotatably connected to the hinge support respectively. The swing arm drive mechanism includes a worm gear, a worm, and a stepper motor. The worm gear is fixedly installed on the first rotating shaft. The worm is arranged laterally below the worm gear and is threadedly engaged with it. The stepper motor is fixed to the base, and its output shaft drives the worm to rotate in the forward or reverse direction.

[0018] The braking mechanism includes a guide rod bracket, brake blocks, a brake disc, a two-way lead screw, and a stepper motor. The brake disc is fixedly mounted on the first rotating shaft. The guide rod bracket is fixed above the base via a mounting plate. There are two brake blocks, symmetrically arranged on the front and rear sides of the brake disc, and they slide longitudinally with the guide rod bracket.

[0019] Stepper motor 2 is fixed to the front exterior of the guide rod bracket. A bidirectional lead screw passes through two brake blocks and is threaded into each brake block. One end of the bidirectional lead screw is fixedly connected to the output shaft of stepper motor 2, and the other end is rotatably connected to the guide rod bracket. Stepper motor 2 drives the two brake blocks through the bidirectional lead screw to clamp the brake disc, thereby fixing the swing arm to the base.

[0020] Furthermore, the upper middle part of the swing arm has a through groove opened along its length direction, the slider seat is embedded in the through groove and slides with the swing arm, and two upright plates are symmetrically arranged on the left and right sides of the swing arm. One end of each upright plate is integral with the slider seat, and the upright plates slide with the outer wall of the swing arm.

[0021] Each side wall of the swing arm is provided with a set of bolt holes. Each set of bolt holes includes multiple bolt holes arranged at equal intervals along the length of the swing arm. Each vertical plate is provided with two fastening bolts. The fastening bolts can be screwed into the bolt holes to fix the slider seat to the swing arm.

[0022] Furthermore, the angle adjustment frame includes two square shafts arranged in parallel longitudinally, with the front and rear ends of the two square shafts respectively fixedly connected to each other by a disc, and the two discs arranged coaxially.

[0023] Two discs are fixed with second rotating shafts on opposite sides. The two second rotating shafts are arranged coaxially. One end of the second rotating shaft is connected to the center of the disc to form a whole. The second rotating shaft passes through the inner side of the slider seat on the same side and rotates with the slider seat. Its other end is located in the first locking block. The first locking block is equipped with a first locking bolt that can lock the second rotating shaft.

[0024] Furthermore, two square shafts are inserted inside the motor mounting bracket, and the motor mounting bracket and the square shafts slide longitudinally together. A positioning bolt is provided on one side of the motor mounting bracket, and the positioning bolt fixes the motor mounting bracket to the square shaft.

[0025] The threaded drill rod has a keyway along its axial direction on its circumferential side wall. A flat key that matches the keyway is fixed on the inner side wall of the hollow shaft. The threaded nut is fixed to the lower part of the motor mounting bracket. The threaded drill rod passes through the threaded nut and is threadedly engaged with it. The drill bit is a cylindrical shape with a closed top and a toothed structure on its lower end face.

[0026] When the servo motor drives the threaded drill rod to rotate, the threaded drill rod moves linearly relative to the motor mounting bracket.

[0027] Furthermore, the N-shaped frame is provided with a slide rail that matches its shape. The main body of the square slider is a cube, and it has an outwardly extending limiting part on the opposite side of the two N-shaped frames. The square slider is located inside the slide rail and slides laterally with the top of the N-shaped frame, and can also slide vertically with the left and right sides of the N-shaped frame.

[0028] An angle plate is fixed to the front of each of the two square sliders located inside the N-shaped frame at the rear. The positioning plate and the correction plate are both rectangular flat plates in the shape of strips. A third rotating shaft is fixed at both the front and rear ends. The center line of the positioning plate or the correction plate coincides with the axis of the third rotating shaft located at both ends.

[0029] The third rotating shaft located on the front side passes through the corresponding square slider and extends to the inside of the second locking block. The second locking block is equipped with a second locking bolt that can lock the third rotating shaft. The third rotating shaft located on the rear side has a pointer that cooperates with the angle plate. Its rear end passes through the corresponding square slider and is equipped with a locking nut.

[0030] Furthermore, the N-shaped frame is an integral structure consisting of a crossbeam and two columns, with vertical grooves on adjacent sides of the two columns that mate with the ends of the front or rear side plates.

[0031] The inner sides of the crossbeam and the column each have a straight through groove along their length. The cross-section of the straight through groove matches the square slider. The two ends of the straight through groove in the crossbeam are connected to the upper ends of the straight through grooves in the two columns, forming the slide.

[0032] Another object of the present invention is to provide a method for preparing rock samples containing different bedding and dip angles.

[0033] A method for preparing rock mass samples with different bedding and dip angles, based on the aforementioned apparatus for preparing rock mass samples with different bedding and dip angles, the method comprising the following steps:

[0034] Step 1: Based on the relevant parameters and similarity ratios of the lamellae and bedding in the real layered rock mass, determine the similarity material ratios for the lamellae and bedding, and prepare the lamellae and bedding similar materials.

[0035] Adjust the adjustable feet at the bottom of the test chamber to make the bottom plate surface of the test chamber level. Then, alternately lay the layered similar material and the layered similar material of the predetermined thickness from bottom to top inside the test chamber. After laying each layer of layered similar material or layered similar material, it is necessary to smooth and compact it until the rock mass model is laid. After curing, the rock mass model reaches the predetermined strength.

[0036] Step 2: Remove the left and right side panels of the test chamber. Then, install the two N-shaped frames onto the front and rear side panels of the test chamber, respectively, with the bottom of the crossbeams of the N-shaped frames attached to the upper end of the front or rear side panel.

[0037] Adjust the adjustable feet at the bottom of the test chamber to lift it off the ground, and the test chamber will fall onto the guide rail.

[0038] Move the test chamber and the rock mass model inside it along the guide rail to the space between the two swing arms. The two hinged supports are in the middle of the test chamber. Adjust the adjustable feet at the bottom of the test chamber again to raise the test chamber. After the bottom of the test chamber is separated from the guide rail, it is in a horizontal state.

[0039] Step 3: Based on the sampling position and angle at the top of the rock mass model, move the positioning plate and the calibration plate to both sides of the sampling position, and adjust the angle of the positioning plate and the calibration plate to be consistent with the sampling angle.

[0040] Afterwards, the positioning plate is fixedly connected to the two N-shaped frames, and the correction plate is fixedly connected to the square slider at its front end. At this time, the correction plate can slide on the two N-shaped frames through the square sliders at its front and rear ends.

[0041] Step 4: Drive the swing arm to rotate to one side of the sampling position through the swing arm drive mechanism, start the servo motor, and the servo motor drives the drill bit to move down to the upper surface of the rock mass model, and then stop moving. The drill bit is between the positioning plate and the correction plate.

[0042] The angle of the swing arm is adjusted again by the swing arm drive mechanism, and at the same time, the rotation angle adjustment frame is used to move the drill bit closer to one side of the positioning plate. The circumferential sidewall of the drill bit is completely in contact with the sidewall of the positioning plate. Then, the correction plate moves towards the drill bit, and its sidewall is completely in contact with the circumferential sidewall of the drill bit, thus fixing the correction plate to the two N-shaped frames.

[0043] The swing arm is locked by a braking mechanism, and the first locking block locks the front and rear ends of the angle adjustment frame. The two ends of the angle adjustment frame are fixedly connected to the two swing arms respectively.

[0044] Step 5: Move the positioning plate and the correction plate to both sides of the drill bit, and lock the motor mounting bracket and the angle adjustment bracket in place.

[0045] The servo motor restarts, the drill bit rotates forward to contact the rock mass model and drills down to extract the rock mass sample. After reaching the set drilling depth, the drill bit reverses to remove the rock mass sample. Then, the sampling position and / or sampling angle of the drill bit are adjusted, and sampling is repeated multiple times at the top of the rock mass model in the above manner.

[0046] Step 6: After sampling is completed at the top of the rock mass model, adjust the angle adjustment frame, drilling device, positioning plate and correction plate to the side of the rock mass model, and repeat steps 3 to 5. The drilling device completes sampling on the side of the rock mass model.

[0047] The drilled rock samples are cut and ground into standard samples according to requirements for use.

[0048] By adopting the above technical solution, the beneficial technical effects of the present invention are as follows:

[0049] 1. This invention combines large-size horizontal model laying with multi-angle drilling to achieve sampling at multiple locations on the left, top, and right sides of the rock mass model. It has a high degree of automation, ensuring the continuity and stability of the sampling process, and speeding up the sampling process. It also reduces the sampling time interval and maximizes the use of the laid model material, thus improving the utilization rate of the model material.

[0050] 2. The present invention allows for flexible adjustment of the drilling angle, and the drilling device is precisely matched with the positioning plate and the correction plate to ensure the accuracy and consistency of the sample drilling angle.

[0051] 3. The model laying and parameter adjustment are more flexible. Based on the relevant parameters (physical, mechanical and permeability) and main similarity ratios of the strata and bedding in the layered rock mass, the similar material ratios of the strata and bedding are obtained through mix proportioning tests and used as the basis for model laying. The laying thickness of the strata and bedding can be flexibly adjusted according to the specific needs of the test, which can ensure the levelness of each layer of strata and bedding.

[0052] 4. The present invention is more convenient to operate. The entire sampling process only requires laying out a large-size horizontal model once. The required bedding angle, shape and size of the sample can be flexibly drilled according to the test requirements. It overcomes the drawback of the traditional sample drilling process that requires frequent moving or adjustment of the model angle, which greatly simplifies the operation process and reduces the difficulty and labor intensity of operation. Attached Figure Description

[0053] Figure 1 This is a schematic diagram of the structure of an apparatus for preparing rock samples with different bedding and dip angles according to the present invention.

[0054] Figure 2 This is a schematic diagram of the structure of the test chamber of the present invention.

[0055] Figure 3 This is a partial cross-sectional view of the fit between the test chamber and the N-shaped frame of the present invention.

[0056] Figure 4 This is a partial assembly diagram of the present invention, showing the swing arm, angle adjustment frame, and drilling device.

[0057] Figure 5 yes Figure 4 Enlarged view of part A in the middle.

[0058] Figure 6 yes Figure 4 The schematic diagram of a certain part shows the slider seat.

[0059] Figure 7 This is a schematic diagram of the combined structure of the positioning plate, the correction plate, and the two N-shaped frames of the present invention.

[0060] Figure 8 This is a schematic diagram of the installation process of the two N-shaped frames of the present invention on the test chamber.

[0061] Figure 9 This is a diagram showing the usage state of an apparatus for preparing rock samples with different bedding and dip angles according to the present invention.

[0062] Figure 10 This is a schematic diagram of the process of the drill bit of the present invention taking samples on the left, right and top sides of the rock mass model.

[0063] Figure 11 This is a schematic diagram of the structure of the standard sample prepared according to the present invention. Detailed Implementation

[0064] To make the advantages and technical solutions of the present invention clearer and more explicit, the present invention will be described in detail below with reference to specific embodiments.

[0065] Example 1, combined with Figures 1 to 9 An apparatus for preparing rock samples with different bedding and dip angles, particularly suitable for shale sample preparation, includes a base 1, a test chamber 2, a swing arm 3, an angle adjustment frame 4, a drilling device 5, a positioning and correction device, and an electrical control unit. The base 1 is a square plate that can be fixed to the ground or a workbench. Two guide rails 11 with a square cross-section are laid on the upper surface of the base 1, and the two guide rails 11 are fixedly installed on the base 1 in parallel, one in front of the other. Preferably, the upper surface of the guide rail 11 has multiple rollers arranged at intervals along its length. All rollers are rotatably mounted inside their respective guide rails in an embedded manner, and the upper surfaces of all rollers on the same guide rail 11 are at the same height.

[0066] The test chamber 2 is a square box with an open top. Both sides of the test chamber 2 are detachable. The test chamber 2 is mounted on the base 1 via two guide rails 11. Each of the four corners of its bottom is equipped with an adjustable foot 12. The height of the adjustable foot 12 is adjustable. When the adjustable foot 12 is in contact with the ground and supports the test chamber 2, the flatness of the test chamber 2 is adjusted by the adjustable foot 12 to keep the test chamber 2 in a horizontal state. After the adjustable foot 12 is off the ground, the two guide rails 11 support the bottom of the test chamber 2, and the bottom of the test chamber 2 slides in contact with the upper surface of the guide rails 11.

[0067] The test chamber 2 includes a base plate 21, a front side plate 22, a rear side plate 23, a left side plate 24, and a right side plate 25. The front side plate 22 and the rear side plate 23 are vertically arranged on the front and rear sides of the base plate 21, and the lower ends of the front side plate 22 and the rear side plate 23 are fixedly connected to the base plate 21. The left side plate 24 and the right side plate 25 are vertically arranged between the front side plate 22 and the rear side plate 23, and the front and rear ends of the left side plate 24 and the right side plate 25 are respectively inserted and fixedly connected to the opposite side walls of the front side plate 22 and the rear side plate 23.

[0068] The front side wall of the rear side plate 23 has two T-shaped grooves 26 arranged on the left and right, and the rear side wall of the front side plate 22 has two identical T-shaped grooves 26 corresponding to the positions of the rear side plate 23. The front and rear ends of the left side plate 24 and the right side plate 25 are provided with elongated T-shaped sliders 261 integrated with them. Each T-shaped slider 261 slides in cooperation with the corresponding T-shaped groove 26. The left and right ends of the front side plate 22 and the rear side plate 23 protrude outward relative to the outer wall of the left side plate 24 or the right side plate 25.

[0069] The T-shaped sliders 261 at the front and rear ends of the left side plate 24 and the right side plate 25 can be inserted from top to bottom into the corresponding T-shaped grooves 26 of the front side plate 22 and the rear side plate 23, and after reaching the surface of the bottom plate 21, the left and right sides of the test chamber 2 are sealed. After the left side plate 24 and the right side plate 25 are lifted upwards until the T-shaped sliders 261 at their front and rear ends disengage from the corresponding T-shaped grooves 26, the left side plate 24 and the right side plate 25 can be removed from the test chamber 2, and samples can be taken from the side of the rock mass model 9 formed inside the test chamber 2.

[0070] A limiting plate 27 is fixedly provided at the bottom of the test chamber 2. The front and rear sides of the limiting plate 27 are respectively slidably engaged with the side walls of the two guide rails 11. The front side of the bottom plate 21 has a horizontally arranged level ruler 28, which is used to detect the horizontality of the test chamber 2 in the left and right directions. The right side of the limiting plate 27 has a vertically arranged level ruler 29, which is used to detect the horizontality of the test chamber 2 in the front and back directions. When the bubbles in the level ruler 28 and the level ruler 29 are both in the middle position, it indicates that the test chamber 2 is in a horizontal state.

[0071] The positioning and correction device includes two N-shaped frames 6, which are detachably installed on the front and rear sides of the test chamber 2. Each N-shaped frame 6 is an integral structure consisting of a crossbeam 61 and two uprights 62, and possesses high rigidity. Vertical grooves 621, which mate with the left and right ends of the front side plate 22 or the rear side plate 23, are provided on the sidewalls of adjacent sides of the two uprights 62. The vertical grooves 621 extend to the lower end face of the uprights 62. The N-shaped frame 6 can be fixedly installed on the front side plate 22 or the rear side plate 23. During installation, the N-shaped frame 6 is placed above the front side plate 22 or the rear side plate 23, with the left and right ends of the front side plate 22 or the rear side plate 23 aligned with and entering the vertical grooves 621 on the left and right inner sides of the N-shaped frame 6. The N-shaped frame 6 falls to the bottom of its crossbeam 61 and contacts the top surface of the front side plate 22 or the rear side plate 23, thus completing the fixation of the N-shaped frame 6 on the test chamber 2.

[0072] A positioning plate 65 and a correction plate 66 are provided between the two N-shaped frames 6. The front and rear ends of the positioning plate 65 and the correction plate 66 are slidably engaged with the top and left and right sides of the two N-shaped frames 6 through a square slider 64. In addition, the positioning plate 65 and the correction plate 66 can rotate relative to the two N-shaped frames 6 respectively to adjust their tilt angle.

[0073] The N-shaped frame 6 has a slide 63 that matches its shape. Specifically, the inner sides of the crossbeam 61 and the column 62 each have a straight groove along their length. The cross-section of the straight groove matches the square slider 64. The two ends of the straight groove in the crossbeam 61 are connected to the upper ends of the straight grooves in the two columns 62, thus forming the slide 63.

[0074] In addition, the front and rear ends of the positioning plate 65 and the correction plate 66 are respectively rotatably connected to the corresponding square sliders 64. The two square sliders 64 located on the front N-shaped frame 6 are each provided with a second locking block 69, which fixes the positioning plate 65 or the correction plate 66 to the corresponding square slider 64.

[0075] Specifically, the main body of the square slider 64 is a cube, and it has an outwardly extending limiting part on the opposite side of the two N-shaped frames 6. The square slider 64 is located inside the slide rail 63 and slides laterally with the top of the N-shaped frame 6, and can also slide vertically with the left and right sides of the N-shaped frame 6. An angle plate 68 is fixed to the front of each of the two square sliders 64 located inside the rear N-shaped frame 6. The positioning plate 65 and the correction plate 66 are both rectangular flat plates, with a third rotating shaft 67 fixed at both ends. The center line of the positioning plate 65 or the correction plate 66 coincides with the axis of the third rotating shaft 67 located at both ends. The positioning plate 65 or the correction plate 66 can rotate relative to the square slider 64 around the axis of the third rotating shaft 67 at both ends, adjusting the positioning plate 65 or the correction plate 66 to a set tilt angle.

[0076] The third rotating shaft 67 located on the front side passes through the corresponding square slider 64 and extends to the inside of the second locking block 69. The second locking block 69 is equipped with a second locking bolt that can lock the third rotating shaft 67. The pointer 681 that cooperates with the angle plate 68 is fixed on the third rotating shaft 67 located on the rear side. Its rear end extends out of the corresponding square slider 64 and is equipped with a locking nut. The positioning plate 65 or the correction plate 66 slides with the two N-shaped frames 6 through the square sliders 64 at the front and rear ends, adjusting its position on the N-shaped frame 6. When the square slider 64 reaches the end of the straight groove of the crossbeam 61, it moves downward and enters the straight groove in the column 62, sliding vertically with the left and right sides of the N-shaped frame 6. At this time, the positioning plate 65 and the correction plate 66 are located on the side of the test chamber 2, used to sample the side of the rock mass model formed in the test chamber 2.

[0077] In use, adjust the tilt angle of the positioning plate 65 or the correction plate 66 by pointer 681. Then, tighten the second locking bolt to lock the second locking block 69 onto the third rotating shaft 67 at the front end of the positioning plate 65 or the correction plate 66. The positioning plate 65 or the correction plate 66 is fixed to the square slider 64 on its front side. Keep the angle changing. After the positioning plate 65 or the correction plate 66 moves to the set position, tighten the locking nut to fix the positioning plate 65 or the correction plate 66 to the two N-shaped frames 6 through the square sliders 64 at both ends.

[0078] The electrical control unit includes a distribution box and a controller. The distribution box is connected to the mains power supply to power the electrical equipment of the present invention, and the controller adopts a controller that is already available in the prior art.

[0079] There are two swing arms 3, which are symmetrically arranged on the outside of the two guide rails 11. The lower end of each swing arm 3 is rotatably connected to the base 1 through the hinge support 32. The lower end of each swing arm 3 is fixed with a first rotating shaft 31. The two first rotating shafts 31 are arranged coaxially and rotatably connected to the hinge support 32 respectively. The hinge support 32 is fixed on the upper surface of the base 1. The swing arm 3 swings left and right around the first rotating shaft 31.

[0080] Each of the two hinge supports 32 has a swing arm drive mechanism on one side facing away from each other. The two swing arm drive mechanisms drive the two swing arms 3 to move synchronously. Specifically, the swing arm drive mechanism includes a worm gear 71, a worm 72, and a stepper motor 73. The worm gear 71 is fixedly mounted on the first rotating shaft 31. The worm 72 is arranged laterally below the worm gear 71 and is threaded into it. The stepper motor 73 is fixed to the base 1, and its output shaft drives the worm 72 to rotate in the forward or reverse direction. The signal terminal of the stepper motor 73 is connected to a controller. The controller is equipped with a control handle. By adjusting the rotation direction and angle of the output shaft of the stepper motor 73 through the control handle, the tilt angle of the swing arms 3 is controlled through pulse commands, and the two swing arms 3 always remain synchronized.

[0081] Each swing arm drive mechanism has a braking mechanism on one side that can fix the swing arm 3 on the same side. Specifically, the braking mechanism includes a guide rod bracket 81, a brake block 82, a brake disc 83, a two-way lead screw, and a stepper motor 84. The brake disc 83 is fixedly installed on the first rotating shaft 31. The guide rod bracket 81 is fixed above the base 1 by a mounting plate. There are two brake blocks 82, which are symmetrically arranged on the front and rear sides of the brake disc 83 and slide longitudinally with the guide rod bracket 81.

[0082] Stepper motor 84 is fixed to the front exterior of guide rod bracket 81. A bidirectional lead screw passes through two brake blocks 82 and is threaded into each brake block 82. One end of the bidirectional lead screw is fixedly connected to the output shaft of stepper motor 84, and the other end is rotatably connected to guide rod bracket 81. Stepper motor 84 drives the two brake blocks 82 to clamp the brake disc 83 through the bidirectional lead screw, thus fixing the swing arm 3 to the base 1. The signal terminal of stepper motor 84 is connected to the controller for communication. The control handle button operation allows the two brake blocks 82 to clamp or release the brake disc 83. After the angle of the swing arm 3 is adjusted to the correct position, the two brake blocks 82 clamp the brake disc 83 to keep the angle of the swing arm 3 unchanged.

[0083] The upper middle part of the swing arm 3 is provided with a slider seat 33 that can be adjusted and fixed thereto. Specifically, the upper middle part of the swing arm 3 has a through groove 34 opened along its length direction. The slider seat 33 is embedded in the through groove 34 and slides in cooperation with the swing arm 3. Two upright plates 35 are symmetrically provided on the left and right sides of the swing arm 3. One end of each upright plate 35 is integral with the slider seat 33. The upright plates 35 slide in cooperation with the outer wall of the swing arm 3.

[0084] Each side wall of the swing arm 3 is provided with a set of bolt holes 36. Each set of bolt holes 36 includes multiple bolt holes 36 arranged at equal intervals along the length of the swing arm 3. Each vertical plate 35 is provided with two fastening bolts. The fastening bolts can be screwed into the bolt holes 36 to fix the slider seat 33 to the swing arm 3.

[0085] Angle adjustment frame 4 is arranged horizontally in the longitudinal direction between two swing arms 3. Its front and rear ends are respectively rotatably connected to two slider seats 33. Each of the two slider seats 33 is provided with a first locking block 37 on the opposite side to fix the angle adjustment frame 4 to the slider seat 33.

[0086] The angle adjustment frame 4 includes two square shafts 41 arranged in parallel longitudinal direction. The front and rear ends of the two square shafts 41 are fixedly connected to each other by a disc 42. The two discs 42 are arranged coaxially.

[0087] Two discs 42 are fixed with second rotating shafts 43 on opposite sides. The two second rotating shafts 43 are arranged coaxially. One end of the second rotating shaft 43 is connected to the center of the disc 42 as a whole. The second rotating shaft 43 passes through the inner side of the slider seat 33 on the same side and rotates with the slider seat 33. Its other end is located in the first locking block 37. The first locking block 37 is equipped with a first locking bolt that can lock the second rotating shaft 43.

[0088] The angle adjustment frame 4 can rotate relative to the swing arm 3 via the second rotating shaft 43 at both ends. After the angle of the angle adjustment frame 4 is adjusted to the correct position, the second rotating shaft 43 is locked to the slider seat 33 by the first locking block 37 located on the slider seat 33, so that the angle adjustment frame 4 maintains a constant angle relative to the swing arm 3.

[0089] The drilling device 5 includes a motor mounting bracket 51, a servo motor 52, a threaded drill rod 53, and a drill bit 54. The motor mounting bracket 51 is mounted on the angle adjustment bracket 4 and is fixedly connected to it in an adjustable manner in terms of its front and rear relative positions. Two square shafts 41 are inserted through the inner side of the motor mounting bracket 51. The motor mounting bracket 51 and the square shafts 41 slide longitudinally together. A positioning bolt 55 is provided on one side of the motor mounting bracket 51, and the positioning bolt 55 fixes the motor mounting bracket 51 to the square shafts 41.

[0090] The servo motor 52 is fixed to the top of the motor mounting bracket 51, and its output shaft is a hollow shaft. The threaded drill rod 53 slides through the inner side of the hollow shaft, and the lower part of the motor mounting bracket 51 is provided with a threaded nut seat that mates with the threaded drill rod 53. Specifically, a keyway 531 along its axial direction is opened on the circumferential side wall of the threaded drill rod 53, and a flat key that mates with the keyway 531 is fixed on the inner side wall of the hollow shaft. The threaded nut seat is fixed to the lower part of the motor mounting bracket 51, and the threaded drill rod 53 passes through the threaded nut seat and is threadedly engaged with it.

[0091] The drill bit 54 is a closed-top cylindrical shape with a toothed lower end. The lower end of the threaded drill rod 53 passes through a threaded nut and is detachably and fixedly connected to the upper end of the drill bit 54. The drill bit 54 and the threaded drill rod 53 are coaxially arranged and connected using existing technology, facilitating the replacement of drill bits of different specifications to meet the testing requirements of drilling rock samples of different sizes. The servo motor 52 drives the drill bit 54 to rotate and move along its axial direction via the threaded drill rod 53. During operation, after locking the position and tilt angle of the swing arm 3 and the angle adjustment frame 4, the tilt angle of the threaded drill rod 53 is also determined. The servo motor 52 is then activated, driving the threaded drill rod 53 to rotate and move along its axial direction, approaching the surface of the rock mass model to drill for the rock sample.

[0092] Example 2, combined with Figures 1 to 11A method for preparing rock mass samples with different bedding and dip angles, using the aforementioned apparatus for preparing rock mass samples with different bedding and dip angles, the method comprising the following steps:

[0093] Step 1: Based on the relevant parameters and similarity ratios of the lamellae and bedding in the real layered rock mass, determine the similarity material ratios for the lamellae and bedding, and prepare the lamellae and bedding similar materials.

[0094] Adjust the adjustable feet 12 at the bottom of the test chamber 2 to make the bottom plate surface of the test chamber 2 level. Then, alternately lay the layer-like material and the bedding-like material of the predetermined thickness from bottom to top inside the test chamber 2. After laying each layer of layer-like material or bedding-like material, it is necessary to smooth and compact it until the rock mass model 9 is laid. After curing, the rock mass model 9 reaches the predetermined strength. The thickness of the layer 91 and bedding 92 of the rock mass model 9 is determined according to the experimental requirements.

[0095] Step 2: Remove the left side panel 24 and right side panel 25 of the test chamber 2. Then, install the two N-shaped frames 6 onto the front side panel 22 and the rear side panel 23 of the test chamber 2, respectively. The bottom of the crossbeam of the N-shaped frame 6 is close to the upper end of the front side panel 22 or the rear side panel 23.

[0096] Adjust the adjustable feet 12 at the bottom of the test chamber 2 to lift them off the ground, and the test chamber 2 will fall onto the guide rail 11.

[0097] Move the test chamber 2 and the rock mass model 9 inside it along the guide rail 12 to the space between the two swing arms 3. The two hinge supports 32 are located in the middle of the test chamber 2. Adjust the adjustable feet 12 at the bottom of the test chamber 2 again to raise the test chamber 2. The bottom of the test chamber 2 is separated from the guide rail 12 and is in a horizontal state under the support of the four adjustable feet 12.

[0098] Step 3: Based on the sampling position and sampling angle at the top of the rock mass model 9, move the positioning plate 65 and the correction plate 66 to both sides of the sampling position, and adjust the angle of the positioning plate 65 and the correction plate 66 to match the sampling angle.

[0099] Afterwards, the front and rear ends of the positioning plate 65 are fixedly connected to the two N-shaped frames 6, and the correction plate 66 is fixedly connected to the square slider 64 at its front end. At this time, the correction plate 66 can slide on the two N-shaped frames 6 through the square sliders 64 at its front and rear ends.

[0100] Step 4: Drive the swing arm 3 to rotate to one side of the sampling position through the swing arm drive mechanism, start the servo motor 52, and drive the drill bit 54 to move downward to the upper surface of the rock mass model 9, and then stop moving. The drill bit 54 is between the positioning plate 65 and the correction plate 66.

[0101] The angle of the swing arm 3 is adjusted again by the swing arm drive mechanism, and at the same time, the rotation angle adjustment frame 4 is used to move the drill bit 54 closer to one side of the positioning plate 65. The circumferential side wall of the drill bit 54 is completely in contact with the side wall of the positioning plate 65. Then, the correction plate 65 moves towards the drill bit, and its side wall is completely in contact with the circumferential side wall of the drill bit 54, and the correction plate 66 is fixedly connected to the two N-shaped frames 3.

[0102] The swing arm 3 is locked by the braking mechanism, and the first locking block 37 locks the front and rear ends of the angle adjustment frame 4. The two ends of the angle adjustment frame 4 are fixedly connected to the two swing arms 3 respectively.

[0103] Step 5: Release the fixed connection between the positioning plate 65 and the correction plate 66 and the two N-shaped brackets 3. Move the positioning plate 65 and the correction plate 66 to both sides of the drill bit 54 respectively, and lock the motor mounting bracket 51 and the angle adjustment bracket 4 in place.

[0104] Servo motor 52 starts again, drill bit 54 rotates forward to contact rock mass model 9 and drills down to extract rock mass sample. After reaching the set drilling depth, drill bit 54 reverses to extract rock mass sample. Then, the sampling position and / or sampling angle of drill bit 54 are adjusted and repeated sampling is performed multiple times at the top of rock mass model 9 in the manner described above.

[0105] Step 6: After sampling is completed at the top of the rock mass model 9, adjust the angle adjustment frame 4, drilling device 5, positioning plate 65 and correction plate 66 to the side of the rock mass model 9, and repeat steps 3 to 5. The drilling device 5 completes the sampling on the side of the rock mass model 9.

[0106] The drilled rock samples were cut and ground into standard sample 93 as required for use.

[0107] For any parts not mentioned in this invention, existing technologies can be used or referenced.

[0108] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0109] In the description of this invention, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0110] Of course, the above description is not intended to limit the present invention, and the present invention is not limited to the examples given above. Any changes, modifications, additions or substitutions made by those skilled in the art within the scope of the present invention should also fall within the protection scope of the present invention.

Claims

1. An apparatus for preparing rock samples containing different bedding and dip angles, characterized in that, It includes a base, test chamber, swing arm, angle adjustment frame, drilling device, positioning and correction device and electrical control unit. The test chamber is a square box with an open top and detachable left and right sides. The test chamber is mounted on the base via two guide rails, and each of its four bottom corners is equipped with an adjustable foot. There are two swing arms, which are symmetrically arranged on the outside of the two guide rails. The lower end of each swing arm is rotatably connected to the base through a hinge support. Each of the two hinge supports is equipped with a swing arm drive mechanism on the opposite side. The two swing arm drive mechanisms drive the two swing arms to move synchronously. Each swing arm drive mechanism is equipped with a braking mechanism on one side that can fix the swing arm on the same side. The upper middle part of the swing arm is provided with a slider seat that can be adjusted and fixed thereto. The angle adjustment frame is arranged horizontally in the longitudinal direction between the two swing arms. Its front and rear ends are respectively rotatably connected to the two slider seats. The two slider seats are provided with a first locking block that fixes the angle adjustment frame to the slider seat on the opposite side of each other. The drilling device includes a motor mounting bracket, a servo motor, a threaded drill rod, and a drill bit. The motor mounting bracket is mounted on an angle adjustment bracket and is fixedly and adjustablely connected to it in its front and rear relative positions. The servo motor is fixed to the top of the motor mounting bracket, and its output shaft is a hollow shaft. The threaded drill rod is slidably inserted inside the hollow shaft. The lower part of the motor mounting bracket is provided with a threaded nut seat that cooperates with the threaded drill rod. The lower end of the threaded drill rod passes through the threaded nut seat and is detachably and fixedly connected to the upper end of the drill bit. The servo motor drives the drill bit to rotate and move along its axial direction through the threaded drill rod. The positioning and correction device includes two N-shaped frames that can be detachably installed on the front and rear sides of the test chamber. A positioning plate and a correction plate are provided between the two N-shaped frames. The front and rear ends of the positioning plate and the correction plate are slidably engaged with the top and left and right sides of the two N-shaped frames through a square slider. In addition, the front and rear ends of the positioning plate and the correction plate are rotatably connected to the corresponding square sliders. The two square sliders on the front N-shaped frame are equipped with second locking blocks, which fix the positioning plate or correction plate to the corresponding square sliders.

2. The apparatus for preparing rock samples with different bedding and dip angles according to claim 1, characterized in that, The test chamber includes a bottom plate, a front side plate, a rear side plate, a left side plate, and a right side plate. The lower ends of the front side plate and the rear side plate are fixedly connected to the bottom plate. The left side plate and the right side plate are vertically arranged between the front side plate and the rear side plate. The front and rear ends of the left side plate and the right side plate are respectively inserted and fixedly connected to the opposite side walls of the front side plate and the rear side plate. The front side wall of the rear side panel has two T-shaped grooves arranged on the left and right, and the rear side wall of the front side panel has two identical T-shaped grooves that correspond one-to-one with the position of the rear side panel. Both the front and rear ends of the left and right side plates are equipped with long strip-shaped T-shaped sliders integrated with them. Each T-shaped slider slides in conjunction with the corresponding T-shaped groove. The left and right ends of the front and rear side plates extend out of the outer wall of the left or right side plate.

3. The apparatus for preparing rock samples with different bedding and dip angles according to claim 2, characterized in that, The guide rail has a square cross-section, and two guide rails are arranged laterally parallel on the base. The surface of the guide rail has multiple rollers arranged at intervals along its length. A limiting plate is fixedly provided at the bottom of the test chamber. The front and rear sides of the limiting plate are slidably engaged with the side walls of the two guide rails. A horizontal ruler is arranged horizontally on the front side of the bottom plate, and a horizontal ruler is arranged vertically on the right side of the limiting plate.

4. The apparatus for preparing rock samples with different bedding and dip angles according to claim 1, characterized in that, Each swing arm has a first rotating shaft fixed at its lower end. The two first rotating shafts are arranged coaxially and are rotatably connected to the hinge support respectively. The swing arm drive mechanism includes a worm wheel, a worm, and a stepper motor. The worm wheel is fixedly installed on the first rotating shaft. The worm is arranged horizontally below the worm wheel and is threadedly engaged with it. The stepper motor is fixed to the base and its output shaft drives the worm to rotate in the forward or reverse direction. The braking mechanism includes a guide rod bracket, brake blocks, a brake disc, a two-way lead screw, and a stepper motor. The brake disc is fixedly mounted on the first rotating shaft. The guide rod bracket is fixed above the base via a mounting plate. There are two brake blocks, symmetrically arranged on the front and rear sides of the brake disc, and they slide longitudinally with the guide rod bracket. Stepper motor 2 is fixed to the front exterior of the guide rod bracket. A bidirectional lead screw passes through two brake blocks and is threaded into each brake block. One end of the bidirectional lead screw is fixedly connected to the output shaft of stepper motor 2, and the other end is rotatably connected to the guide rod bracket. Stepper motor 2 drives the two brake blocks through the bidirectional lead screw to clamp the brake disc, thereby fixing the swing arm to the base.

5. The apparatus for preparing rock samples with different bedding and dip angles according to claim 1, characterized in that, The upper middle part of the swing arm has a through groove opened along its length direction. The slider seat is embedded in the through groove and slides with the swing arm. Two upright plates are symmetrically arranged on the left and right sides of the swing arm. One end of each upright plate is integral with the slider seat. The upright plates slide with the outer wall of the swing arm. Each side wall of the swing arm is provided with a set of bolt holes. Each set of bolt holes includes multiple bolt holes arranged at equal intervals along the length of the swing arm. Each vertical plate is provided with two fastening bolts. The fastening bolts can be screwed into the bolt holes to fix the slider seat to the swing arm.

6. The apparatus for preparing rock samples with different bedding and dip angles according to claim 5, characterized in that, The angle adjustment frame includes two square shafts arranged in parallel longitudinally. The front and rear ends of the two square shafts are fixedly connected to each other by a disc, and the two discs are arranged coaxially. Two discs are fixed with second rotating shafts on opposite sides. The two second rotating shafts are arranged coaxially. One end of the second rotating shaft is connected to the center of the disc to form a whole. The second rotating shaft passes through the inner side of the slider seat on the same side and rotates with the slider seat. Its other end is located in the first locking block. The first locking block is equipped with a first locking bolt that can lock the second rotating shaft.

7. The apparatus for preparing rock samples with different bedding and dip angles according to claim 6, characterized in that, Two square shafts are inserted inside the motor mounting bracket. The motor mounting bracket and the square shafts slide longitudinally together. A positioning bolt is provided on one side of the motor mounting bracket, which fixes the motor mounting bracket on the square shaft. The threaded drill rod has a keyway along its axial direction on its circumferential side wall. A flat key that matches the keyway is fixed on the inner side wall of the hollow shaft. The threaded nut is fixed to the lower part of the motor mounting bracket. The threaded drill rod passes through the threaded nut and engages with its thread. The drill bit is a cylindrical shape with a closed top and a toothed structure on its lower end face. When the servo motor drives the threaded drill rod to rotate, the threaded drill rod moves linearly relative to the motor mounting bracket.

8. The apparatus for preparing rock samples with different bedding and dip angles according to claim 2, characterized in that, The N-shaped frame has a slide rail that matches its shape. The main body of the square slider is a cube. It has an outwardly extending limiting part on the opposite side of the two N-shaped frames. The square slider is located inside the slide rail and slides horizontally with the top of the N-shaped frame. It can also slide vertically with the left and right sides of the N-shaped frame. An angle plate is fixed to the front of each of the two square sliders located in the rear N-shaped frame. The positioning plate and the correction plate are both strip-shaped rectangular flat plates, and a third rotating shaft is fixed at both the front and rear ends. The center line of the positioning plate or the correction plate coincides with the axis of the third rotating shaft located at both ends. The third rotating shaft located on the front side passes through the corresponding square slider and extends to the inside of the second locking block. The second locking block is equipped with a second locking bolt that can lock the third rotating shaft. The third rotating shaft located on the rear side has a pointer that cooperates with the angle plate. Its rear end passes through the corresponding square slider and is equipped with a locking nut.

9. The apparatus for preparing rock samples with different bedding and dip angles according to claim 8, characterized in that, The N-shaped frame is an integral structure consisting of a crossbeam and two columns. Each of the two columns has a vertical groove on an adjacent side that matches the end of the front or rear side plate. The inner sides of the crossbeam and the column each have a straight through groove along their length. The cross-section of the straight through groove matches the square slider. The two ends of the straight through groove in the crossbeam are connected to the upper ends of the straight through grooves in the two columns, forming the slide.

10. A method for preparing rock mass samples containing different bedding and dip angles, characterized in that, Based on the apparatus for preparing rock mass samples with different bedding and dip angles as described in any one of claims 1-9, the method comprises the following steps: Step 1: Based on the relevant parameters and similarity ratios of the lamellae and bedding in the real layered rock mass, determine the similarity material ratios of the lamellae and bedding, and prepare the lamellae and bedding similar materials. Adjust the adjustable feet at the bottom of the test chamber to make the bottom plate surface of the test chamber level. Then, alternately lay the layered similar material and the layered similar material of the predetermined thickness from bottom to top inside the test chamber. After laying each layer of layered similar material or layered similar material, it is necessary to smooth and compact it until the rock mass model is laid. After curing, the rock mass model reaches the predetermined strength. Step 2: Remove the left and right side panels of the test chamber. Then, install the two N-shaped frames onto the front and rear side panels of the test chamber, respectively, with the bottom of the crossbeams of the N-shaped frames attached to the upper end of the front or rear side panel. Adjust the adjustable feet at the bottom of the test chamber to lift it off the ground, and the test chamber will fall onto the guide rail; Move the test chamber and the rock mass model inside it along the guide rail to the space between the two swing arms. The two hinge supports are in the middle of the test chamber. Adjust the adjustable feet at the bottom of the test chamber again to raise the test chamber. After the bottom of the test chamber is separated from the guide rail, it is in a horizontal state. Step 3: Based on the sampling position and angle at the top of the rock mass model, move the positioning plate and the correction plate to both sides of the sampling position, and adjust the angle of the positioning plate and the correction plate to be consistent with the sampling angle. Afterwards, the positioning plate is fixedly connected to the two N-shaped frames, and the correction plate is fixedly connected to the square slider at its front end. At this time, the correction plate can slide on the two N-shaped frames through the square sliders at its front and rear ends. Step 4: Drive the swing arm to rotate to one side of the sampling position through the swing arm drive mechanism, start the servo motor, and drive the drill bit to move down to the upper surface of the rock mass model, then stop moving. The drill bit is between the positioning plate and the correction plate. The angle of the swing arm is adjusted again by the swing arm drive mechanism, and at the same time, the rotation angle adjustment frame is used to move the drill bit closer to one side of the positioning plate. The circumferential side wall of the drill bit is completely in contact with the side wall of the positioning plate. Then, the correction plate moves towards the drill bit, and its side wall is completely in contact with the circumferential side wall of the drill bit, and the correction plate is fixedly connected to the two N-shaped frames. The swing arm is locked by the braking mechanism, and the first locking block locks the front and rear ends of the angle adjustment frame. The two ends of the angle adjustment frame are fixedly connected to the two swing arms respectively. Step 5: Move the positioning plate and the correction plate to both sides of the drill bit, and lock and fix the motor mounting bracket and the angle adjustment bracket. The servo motor restarts, the drill bit rotates forward to contact the rock mass model and drills down to extract the rock mass sample. After reaching the set drilling depth, the drill bit reverses to extract the rock mass sample. Then, the sampling position and / or sampling angle of the drill bit are adjusted and the sampling is repeated multiple times at the top of the rock mass model in the above manner. Step 6: After sampling is completed at the top of the rock mass model, adjust the angle adjustment frame, drilling device, positioning plate and correction plate to the side of the rock mass model, and repeat steps 3 to 5. The drilling device completes sampling on the side of the rock mass model. The drilled rock samples are cut and ground into standard samples according to requirements for use.

Images