A method and device for preparing a soft and hard interbedded rock specimen

Abstract

The present application relates to rock sample preparation technical field, disclose a kind of soft and hard interbedded rock specimen preparation device, including workbench, workbench top is provided with mounting groove, mounting groove is equipped with protective cylinder, the bottom of protective cylinder is equipped with shaft hole, shaft hole is equipped with grinding disc spindle, the top of grinding disc spindle is connected with grinding disc, still be provided with the polishing motor of the connecting grinding disc spindle bottom in workbench;Workbench is detachably equipped with support, one end of support is connected with the clamping mechanism for clamping test piece.The clamping mechanism includes installation cylinder, the top of installation cylinder is connected with support, the bottom surface of installation cylinder is equipped with clamping groove, clamping groove is equipped with magnetic layer, and metal plate is magnetically attracted in clamping groove.The present application can realize automatic polishing, its working process improves work efficiency, reduces the error caused by manual operation, ensures the quality stability of test piece, and clamping mechanism can quickly fix sample, can adjust sample polishing pressure, and the polishing effect is better.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of rock sample preparation, and in particular to a method and device for preparing a soft-hard interbedded rock test piece. BACKGROUND

[0002] A soft-hard interbedded rock test piece is a special rock test piece formed by alternating stacking of soft rock and hard rock. Soft rock generally has lower strength and higher deformability, while hard rock is relatively hard and has higher strength. The soft and hard rock layers in this test piece appear alternately at different horizons, forming a unique geological structure.

[0003] The selection of similar materials for soft rock and hard rock needs to be based on research purposes and actual needs. For example, high-strength, low-deformability materials can be selected for hard rock similar materials, while low-strength, high-deformability materials can be selected for soft rock similar materials. The preparation method of the soft-hard interbedded rock test piece generally includes the following steps: first, similar materials such as cement, sand, silica powder, and gypsum are used to prepare soft rock and hard rock similar materials according to different proportions. Then, these materials are poured layer by layer in a mold to form a soft-hard interbedded structure. Finally, the test piece is drilled out according to the required rock layer inclination angle.

[0004] Soft-hard interbedded rock test pieces are usually prepared in regular shapes to facilitate loading and measurement. Common shapes include rectangular prisms, cylinders, etc. Rectangular prism test pieces are convenient for compression, shear, and other tests on conventional mechanical testing machines; cylindrical test pieces are more suitable for tensile strength, acoustic velocity, and other tests.

[0005] At the same time, polishing the bottom surface of the soft-hard interbedded rock test piece is an important step aimed at ensuring the flatness, smoothness of the test piece surface, and good contact with other test equipment or clamps. Since the bottom surface of the test piece needs to be in close contact with the test equipment or clamps during mechanical testing. By polishing, good contact between the test piece bottom surface and these contact surfaces can be ensured, thereby improving the reliability of the test results. SUMMARY

[0006] To solve the technical problems raised in the background art, the present application provides a soft-hard interbedded rock test piece preparation device.

[0007] The present application adopts the following technical solution: a soft-hard interbedded rock test piece preparation device, comprising a workbench, a mounting groove is provided on the top of the workbench, a protective cylinder is fitted in the mounting groove, an axle hole is formed at the bottom of the protective cylinder, an abrasive disc shaft is installed at the axle hole, an abrasive disc is connected to the top end of the abrasive disc shaft, and a polishing motor is also provided in the workbench to connect the bottom end of the abrasive disc shaft; a support is detachably installed on the workbench, and a clamping mechanism for clamping the test piece is connected to one end of the support.

[0008] The clamping mechanism comprises a mounting cylinder, the top end of the mounting cylinder is connected with a support, the bottom surface of the mounting cylinder is provided with a clamping groove, the clamping groove is provided with a magnetic layer, a metal plate is magnetically attracted in the clamping groove, the metal plate is clamped on the outer side of a sample plate, and the bottom surface of the sample plate is used for fixing a test piece.

[0009] As a further improvement of the above-mentioned scheme, the support comprises a base, a telescopic rod and a top plate, wherein the base is connected to the top surface of the workbench by bolts, the upper and lower ends of the telescopic rod are connected with the top plate and the base respectively, and the top plate is detachably connected with the mounting cylinder.

[0010] The height of the mounting cylinder can be adjusted through the telescopic rod, so that the position of the test piece to be polished before polishing is fixed conveniently, and when the telescopic rod is gradually shortened, the mounting cylinder can be gradually moved close to the grinding disc, so that the wafer is ground and polished.

[0011] As a further improvement of the above-mentioned scheme, the top of the mounting cylinder is provided with a cylindrical connecting groove, a cylindrical limiting sleeve is screw-connected at the connecting groove, a containing gap is formed between the limiting sleeve and the connecting groove, a limiting part is arranged in the containing gap, a spring is arranged between the bottom surface of the limiting part and the bottom surface of the connecting groove, a connecting rod is fixed to the bottom surface of the top plate, the bottom end of the connecting rod is movably arranged through the limiting sleeve and the limiting part, the outer side of the connecting rod is provided with a threaded segment, an adjusting cylinder is screw-connected at the threaded segment, and the bottom surface of the adjusting cylinder abuts against the top surface of the limiting sleeve.

[0012] By twisting the limiting sleeve, the mounting cylinder can be pushed to move downward as a whole, and after the wafer contacts the surface of the grinding disc, the pressing force value during polishing can be adjusted, so that the adjustment is convenient for different situations.

[0013] As a further improvement of the above-mentioned scheme, a pressure sensor one is arranged at the bottom of the connecting groove and in contact with the bottom end of the spring, a display and a controller are arranged on the workbench, the pressure sensor one and the signal input end of the controller are electrically connected, and the signal output end of the display and the controller are electrically connected.

[0014] As a further improvement of the above-mentioned scheme, a plurality of insertion holes are circumferentially distributed in the mounting cylinder, a top rod is movably arranged in each insertion hole, a pressure sensor two is arranged on the bottom surface of each top rod, the pressure sensor two and the controller are electrically connected, the top end of each top rod is fixed to the outer side of an activity ring, and a distance adjusting unit for adjusting the distance between the mounting cylinder and the activity ring is arranged between the mounting cylinder and the activity ring.

[0015] The controller and the pressure sensor one and the pressure sensor two are electrically connected, so that the pressure value of the contact point can be detected in real time, which is convenient for observation and convenient for making corresponding adjustment.

[0016] As a further improvement of the above scheme, the distance adjusting unit comprises an electromagnet I and an electromagnet II, the electromagnet I and the electromagnet II are connected with the movable ring and the mounting cylinder respectively, and the electromagnet I and the electromagnet II generate magnetic force when powered to adjust the distance between the movable ring and the mounting cylinder.

[0017] The electromagnet I and the electromagnet II can be electrically connected with the controller, so that the movable ring can be automatically driven to ascend or descend, thereby driving the top rod to ascend or descend correspondingly.

[0018] As a further improvement of the above scheme, the top rod is provided with a water passage, a water spraying hole is formed in the side of the top rod close to the axis of the mounting cylinder and is connected with the water passage, a spray head is connected with the outer end of the water spraying hole, a cavity is formed in the movable ring and is connected with the water passages of the top rods, and a connecting hose is further connected with the movable ring and is connected with an external water supply mechanism at the other end.

[0019] The water can be directly sprayed on the test piece, which is more accurate than the peripheral water spraying in the prior art, and the polishing effect is better.

[0020] As a further improvement of the above scheme, a bottom plate is mounted at the bottom of the top rod, a connecting column is arranged in the middle of the bottom plate, the connecting column is screw-connected with the water passage, and the pressure sensor II is mounted on the bottom plate.

[0021] As a further improvement of the above scheme, an annular dust suction pipe is arranged in the inner ring of the protective cylinder, a plurality of dust suction holes are arranged on the inner side of the dust suction pipe, a gas guide pipe is connected with the dust suction pipe, the other end of the gas guide pipe is connected with an external dust collector, and the dust suction pipe is lower than the grinding disc.

[0022] The dust and impurities generated during polishing can be absorbed through the above structure.

[0023] As a further improvement of the above scheme, an annular baffle is further mounted above the dust suction pipe, the baffle is fixed with the inner ring of the protective cylinder, the top surface of the baffle is arranged in an inclined manner, and the side of the baffle in contact with the inner ring of the protective cylinder is the highest. The baffle can prevent the dust and impurities generated during polishing from accumulating on the top surface of the dust suction pipe and causing cleaning failure.

[0024] The application further provides a preparation method of the soft-hard interbedded rock test piece.

[0025] The prepared soft-hard interbedded rock test piece is fixed on the object carrier plate.

[0026] The object carrier plate is magnetically fixed in the clamping groove, and the position of the test piece is fixed.

[0027] The mounting cylinder is driven to be pressed downward, so that the bottom surface of the test piece is in contact with the surface of the grinding disc.

[0028] Start grinding and check regularly if there are any problems during the grinding process and replace the sandpaper.

[0029] Compared with the prior art, the present invention has the following beneficial effects:

[0030] The automatic polishing device of the present invention includes a workbench, a bracket, and a clamping mechanism connected to one end of the bracket. The clamping mechanism includes a mounting tube, the top end of which is connected to the bracket. The bottom surface of the mounting tube has a slot, a magnetic layer is provided in the slot, and a metal plate is magnetically attracted to the slot. The metal plate is clamped to the outside of a loading plate, and the bottom surface of the loading plate is used to fix the test piece.

[0031] The present invention can realize automatic polishing, and its working process improves work efficiency, reduces errors caused by manual operation, ensures the quality stability of the test piece, and the clamping mechanism can quickly fix the sample and adjust the sample polishing pressure, so the polishing effect is better. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 This is a schematic diagram of the overall structure of the automatic polishing device proposed in the present invention;

[0033] Figure 2 A front view of the automatic polishing device proposed by the present invention;

[0034] Figure 3 This is a cross-sectional view of the internal structure of the workbench and the protective tube proposed by the present invention;

[0035] Figure 4 For the present invention Figure 1 A magnified view of point A;

[0036] Figure 5 Schematic diagram of the overall structure of the clamping mechanism of the present invention;

[0037] Figure 6 For the present invention Figure 5 Enlarged view of point B.

[0038] Description of main symbols:

[0039] In the figure: workbench 1, protective cylinder 2, grinding disc 3, top plate 4, telescopic rod 5, clamping mechanism 6, grinding disc shaft 7, mounting cylinder 8, adjusting cylinder 9, connecting hose 10, distance adjustment module 11, cavity 12, electromagnet 1 13, electromagnet 2 14, limiting sleeve 15, limiting part 16, ejector rod 17, spring 18, pressure sensor 1 19, slot 20, loading plate 21, test piece 22, positioning head 23, metal plate 24, water hole 25, jack 26, water spray hole 27, nozzle 28, connecting column 29, bottom plate 30, pressure sensor 2 31, baffle 33, dust suction pipe 34, connecting rod 35, movable ring 36, limiting ring 37. DETAILED DESCRIPTION

[0040] The present invention will be further described below in conjunction with the accompanying drawings and specific implementation methods. It should be noted that, under the premise of no conflict, the various embodiments or technical features described below can be arbitrarily combined to form new embodiments.

[0041] Example 1:

[0042] Reference Figures 1-6 The present invention proposes a device for preparing soft and hard interbedded rock specimens, which includes a workbench 1. A mounting groove is provided on the top of the workbench 1, and a protective tube 2 is installed in the mounting groove. An axial hole is provided at the bottom of the protective tube 2, and a grinding wheel shaft 7 is installed at the axial hole. The top of the grinding wheel shaft 7 is connected to the grinding wheel 3, and a polishing motor connected to the bottom end of the grinding wheel shaft 7 is also provided in the workbench 1; a bracket is detachably installed on the workbench 1, and one end of the bracket is connected to a clamping mechanism 6 for clamping the specimen 22.

[0043] The clamping mechanism 6 includes a mounting tube 8, the top of which is connected to the bracket, and a slot 20 is provided on the bottom surface of the mounting tube 8. A magnetic layer is provided in the slot 20, and a metal plate 24 is magnetically attracted in the slot 20. The metal plate 24 is clamped to the outside of the carrier plate 21, and the bottom surface of the carrier plate 21 is used to fix the specimen 22. A positioning slot can also be provided in the slot, and a positioning head 23 that cooperates with the positioning slot is correspondingly provided on the outside of the metal plate 24. This allows for quick fixation and keeps the metal plate stable. During operation, the present invention fixes the specimen 22 and the carrier plate with special hot-melt wax, making it easy to remove the specimen after polishing. Due to the different specifications and shapes of the specimens, a positioning ring 37 can be installed at the notch of the slot 20. The inner ring of the positioning ring 37 can contact the outer surface of the specimen, thereby preventing the specimen from shaking when the bottom surface of the specimen is polished.

[0044] The grinding disc of the present invention can be attached with polishing papers of different mesh sizes. The polishing papers are classified into six different mesh sizes according to roughness: 400, 800, 2500, 6000, 8000, and 10000cc. The high-coarseness polishing paper is used to perform preliminary polishing on the sample slice to make it flat. The low-coarseness polishing paper is used to gradually reduce the roughness and polish the sample to meet the requirements of microscopic experiments.

[0045] Specifically, the bracket comprises a base, a telescopic rod 5, and a top plate 4. The base is bolted to the top surface of the workbench 1. The top and bottom ends of the telescopic rod 5 are connected to the top plate and the base, respectively. The top plate 4 is detachably connected to the mounting tube 8. In this embodiment, the telescopic rod 5 can be an electric push rod, a hydraulic cylinder, or an air cylinder. This allows the height of the mounting tube 8 to be adjusted, facilitating the positioning of the specimen before polishing. As the telescopic rod 5 is gradually shortened, the mounting tube 8 is gradually brought closer to the grinding disc, thereby grinding and polishing the thin sheet.

[0046] It is worth mentioning that, refer to Figure 5 A cylindrical connecting groove is provided at the top of the mounting cylinder 8, and a cylindrical limiting sleeve 15 is spirally connected to the connecting groove. An accommodating gap is formed between the limiting sleeve 15 and the connecting groove, and a limiting portion 16 is provided in the accommodating gap. A spring 18 is installed between the bottom surface of the limiting portion 16 and the bottom surface of the connecting groove. A connecting rod 35 is fixed to the bottom surface of the top plate 4, and the bottom end of the connecting rod 35 is movable through the limiting sleeve 15 and connected to the limiting portion 16. The outer side of the connecting rod 35 has a threaded section (not marked), and an adjusting cylinder 9 is spirally installed at the threaded section. The bottom surface of the adjusting cylinder 9 conflicts with the top surface of the limiting sleeve 15.

[0047] The present invention can push the mounting tube 8 downward as a whole by twisting the limiting sleeve 15, and can adjust the downward pressure value during polishing after the sheet contacts the grinding disc surface, which is easy to adjust to suit different situations.

[0048] Furthermore, a pressure sensor 19 in contact with the bottom end of the spring 18 is installed at the bottom of the connecting groove, and a display and a controller are provided on the workbench. The pressure sensor 19 is electrically connected to the signal input end of the controller, and the display is electrically connected to the signal output end of the controller.

[0049] As an optional embodiment of the present invention, a plurality of jacks 26 are distributed circumferentially in the mounting tube 8, and a push rod 17 is movably inserted in each jack 26. A pressure sensor 2 31 is installed on the bottom surface of each push rod, and the pressure sensor 2 31 is electrically connected to the controller. The top end of each push rod 17 is fixed on the outside of a movable ring 36, and a distance adjustment unit for adjusting the distance between the mounting tube 8 and the movable ring 36 is provided between the mounting tube 8 and the movable ring 36.

[0050] The present invention can detect the pressure value of the contact point in real time by electrically connecting the controller with the first pressure sensor and the second pressure sensor, making it easy to observe and make corresponding adjustments. The display can conveniently and intuitively display the pressure value.

[0051] During the specific operation of this solution, for example, when the installation cylinder is pressed down, when there is at least one pressure sensor 2 31 under the push rod 17 that does not detect pressure, or the pressure values ​​detected by each pressure sensor 2 deviate too much, it can be determined that there is a deviation in the installation of the installation cylinder, or the sandpaper on the grinding disc is not completely fitted. Therefore, it can play the role of automatic detection, avoid the problem of uneven grinding due to installation deviation, and further improve the grinding effect.

[0052] In this solution, the distance adjustment unit includes electromagnet 13 and electromagnet 2 14, which are respectively connected to the movable ring 36 and the mounting tube 8, and electromagnet 13 and electromagnet 2 14 are energized to generate magnetic force to adjust the distance between the movable ring 36 and the mounting tube 8.

[0053] The first electromagnet and the second electromagnet proposed in the present invention can be electrically connected to the controller, so as to automatically drive the movable ring 36 to rise or fall, thereby driving the ejector rod to rise or fall accordingly.

[0054] For further information, please refer to Figure 6 , a water hole 25 is provided in the push rod 17, and a water spray hole 27 connected to the water hole 25 is provided on one side of the push rod 17 close to the central axis of the mounting tube 8. A nozzle 28 is connected to the outer port of the water spray hole 27. A cavity 12 connected to the water holes 25 in each push rod 27 is provided in the movable ring 36. A connecting hose 10 is also connected to the movable ring 36, and the other end of the connecting hose 10 is connected to an external water supply mechanism. The present invention can adopt a flat-mouthed nozzle so that the sprayed water is fan-shaped and can be sprayed onto the sample and the grinding disc more evenly. The external water supply mechanism is not shown in the accompanying drawings, but it does not affect the understanding of this solution by those skilled in the art. A water pump can be directly connected to one end of the connecting hose 10, and a water tank for storing water can be placed on the workbench.

[0055] The present invention can directly spray water onto the test piece through the above-mentioned solution. Compared with the prior art of spraying water on the periphery, it is more precise and has a better polishing effect.

[0056] In order to facilitate installation and disassembly, a base plate 30 is installed at the bottom of the top rod, a connecting column 29 is provided in the middle of the base plate 30, the connecting column 29 and the water hole 25 are spirally connected, and a pressure sensor 2 31 is installed on the base plate 30.

[0057] The inner ring of the protective tube 2 is provided with an annular dust suction pipe 34, the inner side of which is provided with a plurality of dust suction holes, and the dust suction pipe 34 is connected to the dust suction pipe 34, the other end of which is connected to an external vacuum cleaner, and the dust suction pipe 34 is lower than the grinding disc 3. This solution can absorb dust and impurities generated by grinding through the above structure.

[0058] As an optional embodiment of the present invention, an annular baffle 33 is installed above the dust collection tube 34. Baffle 33 is fixed to the inner ring of the protective tube 2. The top surface of baffle 33 is tilted, with the side of baffle 33 in contact with the inner ring of the protective tube 2 at its highest point. This baffle 33 prevents dust and impurities generated during grinding from accumulating on the top surface of the dust collection tube 34, making it difficult to clean. Baffle 33 can be made of plastic or stainless steel and can be screwed to the inside of the protective tube with multiple bolts, facilitating regular replacement and cleaning.

[0059] The above embodiments are only preferred embodiments of the present invention and cannot be used to limit the scope of protection of the present invention. Any non-substantial changes and replacements made by technicians in this field on the basis of the present invention fall within the scope of protection required by the present invention.

Claims

1. A device for preparing soft and hard interbedded rock specimens, characterized in that: The workbench comprises a mounting groove provided on the top of the workbench, a protective cylinder installed in the mounting groove, an axial hole provided at the bottom of the protective cylinder, a grinding wheel shaft installed at the axial hole, a grinding wheel connected to the top of the grinding wheel shaft, and a polishing motor connected to the bottom of the grinding wheel shaft provided inside the workbench; a bracket is detachably mounted on the workbench, and one end of the bracket is connected to a clamping mechanism for clamping a test piece; The clamping mechanism includes a mounting tube, the top of which is connected to the bracket, a bottom surface of which is provided with a slot, a magnetic layer is provided in the slot, a metal plate is magnetically attracted in the slot, and the metal plate is clamped to the outside of the loading plate, and the bottom surface of the loading plate is used to fix the specimen; The top of the mounting cylinder is provided with a cylindrical connecting groove, a cylindrical limiting sleeve is spirally connected to the connecting groove, an accommodating gap is formed between the limiting sleeve and the connecting groove, a limiting portion is provided in the accommodating gap, a spring is installed between the bottom surface of the limiting portion and the bottom surface of the connecting groove, a connecting rod is fixed to the bottom surface of the top plate, the bottom end of the connecting rod is movable through the limiting sleeve and connected to the limiting portion, the outer side of the connecting rod has a threaded section, an adjusting cylinder is spirally installed at the threaded section, and the bottom surface of the adjusting cylinder contacts the top surface of the limiting sleeve; A pressure sensor 1 in contact with the bottom end of the spring is installed at the bottom of the connecting groove; The mounting tube has a plurality of jacks distributed circumferentially therein, each of which has a push rod movably inserted therein, the top end of each push rod being fixed to the outside of a movable ring, and a distance adjustment unit for adjusting the distance between the mounting tube and the movable ring being provided between the two; A water hole is provided in the push rod, and a water spray hole connected to the water hole is provided on one side of the push rod close to the central axis of the mounting tube. A nozzle is connected to the outer end of the water spray hole. A cavity connected to the water holes in each push rod is provided in the movable ring. A connecting hose is also connected to the movable ring, and the other end of the connecting hose is connected to an external water supply mechanism.

2. The device for preparing soft-hard interbedded rock specimens according to claim 1, characterized in that: The bracket includes a base, a telescopic rod and a top plate, wherein the base is connected to the top surface of the workbench by bolts, the upper and lower ends of the telescopic rod are respectively connected to the top plate and the base, and the top plate and the mounting tube are detachably connected.

3. The device for preparing soft-hard interbedded rock specimens according to claim 1, characterized in that: A display and a controller are provided on the workbench. The pressure sensor 1 is electrically connected to the signal input end of the controller, and the display is electrically connected to the signal output end of the controller.

4. The device for preparing a soft-hard interbedded rock specimen according to claim 3, characterized in that: A second pressure sensor is installed on the bottom surface of each push rod, and the second pressure sensor is electrically connected to the controller.

5. The device for preparing soft-hard interbedded rock specimens according to claim 4, characterized in that: The distance adjustment unit includes electromagnet 1 and electromagnet 2, which are connected to the movable ring and the installation cylinder respectively. When electromagnet 1 and electromagnet 2 are energized, magnetic force is generated to adjust the distance between the movable ring and the installation cylinder.

6. The device for preparing soft-hard interbedded rock specimens according to claim 1, characterized in that: A bottom plate is installed at the bottom of the top rod, a connecting column is provided in the middle of the bottom plate, the connecting column and the water hole are spirally connected, and the second pressure sensor is installed on the bottom plate.

7. The device for preparing soft-hard interbedded rock specimens according to claim 6, characterized in that: The inner ring of the protective tube is provided with an annular dust suction tube, and a plurality of dust suction holes are provided on the inner side of the dust suction tube, and the dust suction tube is connected to an air guide tube, and the other end of the air guide tube is connected to an external vacuum cleaner. The dust suction tube is lower than the grinding wheel, and an annular baffle is also installed above the dust suction tube. The baffle is fixed to the inner ring of the protective tube, and the top surface of the baffle is inclined, and the side where the baffle contacts the inner ring of the protective tube is the highest.

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