A cylindrical core direct shear test device

Abstract

This utility model relates to the field of rock mechanics testing technology, and in particular to a cylindrical rock core direct shear test device. The cylindrical rock core direct shear test device includes a base plate, two sets of support plates, a support beam, and two sets of linear guide rails; a control box, installed on the outer wall of the support plates; two sets of guide rods, each set installed in a through slot in one of the two support plates, with a lifting plate slidably mounted on each set of guide rods. An upper shear sleeve is fixedly mounted on the lifting plate, and a positive pressure mechanism is installed on the support beam directly above the upper shear sleeve; a sliding frame, slidably mounted on the two sets of linear guide rails, with a connecting column fixedly mounted at the top of the sliding frame, and a lower shear sleeve fixedly mounted at the top of the connecting column. A clamping assembly for holding the cylindrical rock core is mounted on the lower shear sleeve. The cylindrical rock core direct shear test device provided by this utility model has the advantages of convenient loading and unloading and accurate testing.

Description

Technical Field

[0001] This utility model relates to the field of rock mechanics testing technology, and in particular to a cylindrical rock core direct shear test device. Background Technology

[0002] The cylindrical core direct shear test is a very important laboratory test method in rock mechanics and engineering geology, used to obtain the strength characteristics of rock mass structural surfaces.

[0003] Currently, the main testing method used is a direct shear tester. The core component of the direct shear tester is the shear box, which consists of an upper shear box and a lower shear box. The current shear box presents a problem: it is inconvenient to install and retrieve cylindrical rock cores, especially after shearing experiments, as deformed cylindrical rock cores can easily get stuck inside the shear box, affecting material retrieval.

[0004] Therefore, it is necessary to provide a new cylindrical core direct shear test device to solve the above-mentioned technical problems. Utility Model Content

[0005] To solve the above-mentioned technical problems, this utility model provides a cylindrical rock core direct shear test device.

[0006] The cylindrical core direct shear test device provided by this utility model includes: a base plate, and two sets of support plates symmetrically installed on the upper surface of the base plate. Support beams are fixedly installed at the top of the two sets of support plates, and two sets of linear guide rails are installed on the base plate between the two sets of support plates.

[0007] The control box is mounted on the outer wall of the support plate;

[0008] The guide rod is provided in two sets. The two sets of guide rods are respectively installed in the through slots opened in the two sets of support plates. A lifting plate is slidably installed on the two sets of guide rods. An upper shear sleeve is fixedly installed on the lifting plate. A positive pressure mechanism is installed on the support beam directly above the upper shear sleeve.

[0009] A sliding frame is slidably mounted on two sets of linear guide rails, and a connecting column is fixedly mounted on the top of the sliding frame. A lower shear sleeve is fixedly mounted on the top of the connecting column. A clamping assembly for clamping a cylindrical rock core is mounted on the lower shear sleeve. The clamping assembly includes a rectangular sleeve. There are four sets of rectangular sleeves. The four sets of rectangular sleeves are installed at intervals on the outer side wall of the lower shear sleeve. A telescopic plate is slidably mounted inside the four sets of rectangular sleeves. A clamping plate is fixedly mounted on one end of the telescopic plate that extends into the lower shear sleeve.

[0010] A support base is fixedly installed on the base plate, and a side pressing mechanism is installed on the support base;

[0011] A displacement sensor is fixedly mounted on the base plate and electrically connected to the control box. The moving probe of the displacement sensor is fixedly connected to a transmission plate, which is fixedly connected to the bottom of the sliding frame.

[0012] Preferably, the bottom end of the rectangular sleeve has a through groove, the other end of the telescopic plate is fixedly installed with a vertical plate, the bottom end of the vertical plate is fixedly installed with a transmission block, the bottom end of the transmission block has an arc-shaped slope, the clamping assembly also includes a threaded sleeve, the threaded sleeve is threadedly installed on the connecting column, and the threaded sleeve is installed with a transmission collar through a connecting rod, the inner side wall of the transmission collar has an inner slope that contacts and cooperates with the arc-shaped slope.

[0013] Preferably, the positive pressure mechanism includes an electro-hydraulic rod, which is fixedly installed on the support beam and electrically connected to the control box. An installation plate is fixedly installed at the telescopic end of the electro-hydraulic rod, and a connecting spring is fixedly installed at the bottom end of the installation plate. A lower pressure plate is fixedly installed at the bottom end of the connecting spring, and an inner core cylinder that is inserted and mated with the upper shear sleeve is installed on the lower pressure plate. Pressure sensors are installed on both sides of the installation plate and are electrically connected to the control box.

[0014] Preferably, a limiting sleeve is fixedly installed at the top of the lower pressure plate, and a plug rod that is inserted and engaged with the limiting sleeve is fixedly installed at the bottom of the mounting plate.

[0015] Preferably, the inner core cylinder and the lower pressure plate are detachably connected by threads, and the inner diameter of the inner core cylinder is adapted to the outer diameter of the cylindrical rock core.

[0016] Preferably, the side pressure mechanism includes an electro-hydraulic rod two, which is fixedly installed on the support base, and a pressure sensor two is fixedly installed on the telescopic end of the electro-hydraulic rod two, and a push plate is fixedly installed on the end of the pressure sensor two facing the sliding frame.

[0017] Preferably, a channel steel is fixedly installed on the inner side wall of the support plate, a roller shaft that contacts and cooperates with the end of the rectangular sleeve is installed inside the channel steel, and balls that contact and cooperate with the end of the rectangular sleeve are evenly installed at the bottom of the inner cavity of the channel steel.

[0018] Compared with related technologies, the cylindrical core direct shear test device provided by this utility model has the following beneficial effects:

[0019] 1. This utility model provides a cylindrical rock core direct shear test device. By setting a lifting plate on the guide rod, setting an upper shear sleeve on the lifting plate, setting a lower shear sleeve on the sliding frame, and setting a clamping assembly on the lower shear sleeve, the clamping assembly can quickly clamp the cylindrical rock core in the lower shear sleeve by cooperating with a rectangular sleeve, a telescopic plate, a clamping plate, a vertical plate, a transmission block, a threaded sleeve and a transmission ring. After clamping and shearing, the material is also very convenient to remove.

[0020] 2. By setting up a positive pressure mechanism and a side pressure mechanism, and in conjunction with a displacement sensor, the normal stress and tangential force applied to the shear surface of the cylindrical rock core can be accurately measured during the direct shear test. Furthermore, the inner core of the positive pressure mechanism can be disassembled and replaced according to the cylindrical rock core, which facilitates the improvement of the accuracy of shear force measurement and shear displacement measurement. Attached Figure Description

[0021] Figure 1 A schematic diagram of a preferred embodiment of the cylindrical rock core direct shear test device provided by this utility model;

[0022] Figure 2 Another structural schematic diagram of the cylindrical rock core direct shear test device provided by this utility model;

[0023] Figure 3 A cross-sectional structural schematic diagram of the cylindrical rock core direct shear test device provided by this utility model;

[0024] Figure 4 A schematic diagram of the positive pressure mechanism provided by this utility model;

[0025] Figure 5 A schematic diagram of the structure of the lower shear sleeve provided by this utility model, on which a clamping component is installed;

[0026] Figure 6 Another structural schematic diagram of the clamping assembly installed on the lower shear sleeve provided by this utility model;

[0027] Figure 7 for Figure 1 A magnified view of part A shown.

[0028] Labels in the diagram: 1. Base plate; 11. Support plate; 111. Channel steel; 112. Roller shaft; 113. Ball bearing; 12. Support beam; 13. Linear guide rail; 2. Guide rod; 21. Lifting plate; 22. Upper shear sleeve; 23. Locking bolt; 3. Positive pressure mechanism; 31. Electro-hydraulic rod one; 32. Mounting plate; 33. Connecting spring; 34. Lower pressure plate; 35. Inner core cylinder; 36. Pressure sensor one; 341. Limit sleeve 321. Insert rod; 4. Sliding frame; 41. Connecting column; 42. Lower shear sleeve; 43. Transmission plate; 5. Clamping assembly; 51. Rectangular sleeve; 52. Telescopic plate; 53. Clamping plate; 54. Vertical plate; 55. Transmission block; 56. Threaded sleeve; 57. Transmission collar; 6. Support seat; 7. Side pressure mechanism; 71. Electro-hydraulic rod II; 72. Pressure sensor II; 73. Push plate; 8. Displacement sensor; 9. Control box. Detailed Implementation

[0029] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the present utility model.

[0030] The specific implementation of this utility model will be described in detail below with reference to specific embodiments.

[0031] Please see Figures 1 to 7 This utility model provides a cylindrical core direct shear test device, which includes:

[0032] The substrate 1, and two sets of support plates 11 symmetrically mounted on the upper surface of the substrate 1, with support beams 12 fixedly mounted on the top of the two sets of support plates 11, and two sets of linear guide rails 13 mounted on the substrate 1 between the two sets of support plates 11.

[0033] The control box 9 is installed on the outer wall of the support plate 11;

[0034] The guide rod 2 is provided in two sets. The two sets of guide rod 2 are respectively installed in the through slots opened in the two sets of support plates 11. The lifting plate 21 is slidably installed on both sets of guide rod 2. The upper shear sleeve 22 is fixedly installed on the lifting plate 21. The positive pressure mechanism 3 is installed on the support beam 12 directly above the upper shear sleeve 22.

[0035] A sliding frame 4 is slidably mounted on two sets of linear guide rails 13. A connecting column 41 is fixedly mounted on the top of the sliding frame 4, and a lower shear sleeve 42 is fixedly mounted on the top of the connecting column 41. A clamping assembly 5 for clamping a cylindrical rock core is mounted on the lower shear sleeve 42. The clamping assembly 5 includes a rectangular sleeve 51, and there are four sets of rectangular sleeves 51. The four sets of rectangular sleeves 51 are spaced apart and installed on the outer side wall of the lower shear sleeve 42. A telescopic plate 52 is slidably mounted inside the four sets of rectangular sleeves 51, and the telescopic plate 52 extends into the lower shear sleeve. A clamping plate 53 is fixedly installed at one end of the cylinder 42. A through groove is opened at the bottom end of the rectangular sleeve 51. A vertical plate 54 is fixedly installed at the other end of the telescopic plate 52. A transmission block 55 is fixedly installed at the bottom end of the vertical plate 54. A circular arc slope is opened at the bottom end of the transmission block 55. The clamping assembly 5 also includes a threaded sleeve 56. The threaded sleeve 56 is threadedly installed on the connecting column 41. A transmission collar 57 is installed on the threaded sleeve 56 through the connecting rod. An inner slope surface that contacts and cooperates with the circular arc slope is opened on the inner side wall of the transmission collar 57.

[0036] The support base 6 is fixedly installed on the base plate 1, and the support base 6 is equipped with a side pressing mechanism 7.

[0037] The displacement sensor 8 is fixedly mounted on the base plate 1 and electrically connected to the control box 9. The moving probe of the displacement sensor 8 is fixedly connected to the transmission plate 43, and the transmission plate 43 is fixedly connected to the bottom of the sliding frame 4.

[0038] It should be noted that during use, the cylindrical rock core is placed inside the lower shear sleeve 42, and then the transmission ring 57 is rotated. As the transmission ring 57 rotates, it drives the threaded sleeve 56 to rotate synchronously. During rotation, the sleeve moves upward along the connecting column 41. When the transmission ring 57 moves upward, its inner slope abuts against the arc-shaped slope of the transmission block 55, thereby squeezing the transmission block 55 and driving the telescopic plate 52 to slide along the rectangular sleeve 51. As the telescopic plate 52 slides, it drives the clamping plate 53 to clamp the cylindrical rock core inside the lower shear sleeve 42. After clamping, the lifting plate 21 is pulled, causing the upper shear sleeve 22 to slide along the guide rod 2 until... A shearing gap is left between the lower shear sleeve 42 and the cylindrical rock core. Then, the positive pressure mechanism 3 applies a normal force to the cylindrical rock core. After application, the side pressure mechanism 7 pushes the sliding frame 4 to move the lower shear sleeve 42 laterally, thereby performing direct shearing on the cylindrical rock core. During the experiment, the operation of the positive pressure mechanism 3 and the side pressure mechanism 7 is controlled by the control box 9, and relevant experimental data are collected and organized. After the shearing experiment, when the transmission collar 57 is rotated in the reverse direction, the clamping of the cylindrical rock core in the lower shear sleeve 42 can be released. Then, the electric hydraulic rod 31 is controlled to retract upward, and the cylindrical rock core in the lower shear sleeve 42 can be easily removed, making loading and unloading convenient.

[0039] It should also be noted that: the lifting plate 21 is threaded with locking bolts 23. After the lifting plate 21 slides up and down along the guide rod 2 for adjustment, the locking bolts 23 are used to fix the lifting plate 21 to the guide rod 2. This makes it easy to adjust the gap between the upper shear sleeve 22 and the lower shear sleeve 42.

[0040] In the embodiments of this utility model, please refer to Figures 1 to 7 The positive pressure mechanism 3 includes an electric hydraulic rod 31, which is fixedly installed on the support beam 12 and electrically connected to the control box 9. An installation plate 32 is fixedly installed at the telescopic end of the electric hydraulic rod 31. A connecting spring 33 is fixedly installed at the bottom end of the installation plate 32. A lower pressure plate 34 is fixedly installed at the bottom end of the connecting spring 33. An inner core cylinder 35 that is inserted and mated with the upper shear sleeve 22 is installed on the lower pressure plate 34. Pressure sensors 36 are installed on both sides of the installation plate 32 and are electrically connected to the control box 9.

[0041] The inner core cylinder 35 and the lower pressure plate 34 are detachably connected by threads, and the inner diameter of the inner core cylinder 35 is adapted to the outer diameter of the cylindrical rock core.

[0042] It should be noted that when the positive pressure mechanism 3 is in use, the control electric hydraulic rod 31 extends downward until the inner core cylinder 35 is inserted into the upper shear sleeve 22 and wraps around the cylindrical rock core. After wrapping, it continues to move until the lower pressure plate 34 presses against the top of the cylindrical rock core. At this time, the detection probe of the pressure sensor 36 presses against the top of the lower pressure plate 34. After pressing, the pressure sensor 36 is used to accurately measure the normal stress applied to the vertical direction of the shear surface.

[0043] In this embodiment: a limiting sleeve 341 is fixedly installed at the top of the pressure plate 34, and a plug rod 321 that is inserted and engaged with the limiting sleeve 341 is fixedly installed at the bottom of the mounting plate 32. In this way, when the mounting plate 32 drives the pressure plate 34 to press down through the connecting spring 33, the cooperation of the limiting sleeve 341 and the plug rod 321 can achieve stable transmission and drive the pressure plate 34 to apply positive pressure to the cylindrical rock core.

[0044] In the embodiments of this utility model, please refer to Figures 1 to 7 The side pressure mechanism 7 includes an electric hydraulic rod 71, which is fixedly installed on the support base 6. A pressure sensor 72 is fixedly installed on the telescopic end of the electric hydraulic rod 71, and a push plate 73 is fixedly installed on the end of the pressure sensor 72 facing the sliding frame 4.

[0045] It should be noted that when the side pressure mechanism 7 is in use, the control electric hydraulic rod 71 pushes the sliding frame 4 along the linear guide rail 13 through the pressure sensor 72 and the push plate 73, thereby driving the lower shear sleeve 42 on the sliding frame 4 to push the internal cylindrical rock core to make transverse cuts along the shear plane. The tangential force is detected by the pressure sensor 72, and the distance of transverse movement is accurately measured by the displacement sensor 8, thereby completing the measurement data of the direct shear test.

[0046] In the embodiments of this utility model, please refer to Figures 1 to 7 A channel steel 111 is fixedly installed on the inner side wall of the support plate 11. A roller 112 that contacts and cooperates with the end of the rectangular sleeve 51 is installed inside the channel steel 111. Ball bearings 113 that contact and cooperate with the end of the rectangular sleeve 51 are evenly installed at the bottom of the inner cavity of the channel steel 111.

[0047] It should be noted that when the electric hydraulic rod 71 drives the sliding frame 4 to slide along the linear guide rail 13, the rectangular sleeve 51 located in the channel steel 111 uses the cooperation of the roller 112 and the ball 113 to improve the lateral stability of the sliding frame 4.

[0048] The working principle of the cylindrical rock core direct shear test device provided by this utility model is as follows:

[0049] In use, the cylindrical rock core is placed inside the lower shear sleeve 42. Then, the transmission ring 57 is rotated. When the transmission ring 57 rotates, it drives the threaded sleeve 56 to rotate synchronously. During rotation, it moves upward along the connecting column 41. When the transmission ring 57 moves upward, it abuts against the arc slope of the transmission block 55 through the inner slope surface, thereby squeezing the transmission block 55 and driving the telescopic plate 52 to slide along the rectangular sleeve 51. When the telescopic plate 52 slides, it drives the clamping plate 53 to clamp the cylindrical rock core inside the lower shear sleeve 42. After clamping, the lifting plate 21 is pulled to slide the upper shear sleeve 22 along the guide rod 2 until a shearing gap is left with the lower shear sleeve 42. Then, the electric hydraulic rod 31 is controlled to extend downward until the inner core cylinder 35 is inserted into the upper shear sleeve 22 and wraps around the cylindrical rock core. After wrapping, it continues to move until the lower pressure plate 34 presses against the cylindrical rock core. At the top, the detection probe of pressure sensor 36 presses against the top of the lower pressure plate 34. After pressing, pressure sensor 36 accurately measures the normal stress applied to the vertical direction of the shear surface. Then, the electric hydraulic rod 71 is controlled to slide along the linear guide rail 13 through pressure sensor 72 and push plate 73, thereby driving the lower shear sleeve 42 on the sliding frame 4 to push the internal cylindrical rock core to cut across the shear surface. The tangential force is detected by pressure sensor 72, and the distance of the transverse movement is accurately measured by displacement sensor 8, thus completing the measurement data of the direct shear test. After the shear test, when the transmission sleeve 57 is rotated in the opposite direction, the clamping of the cylindrical rock core in the lower shear sleeve 42 can be released. Then, the electric hydraulic rod 31 is controlled to retract upward, and the cylindrical rock core in the lower shear sleeve 42 can be easily removed, making loading and unloading convenient.

[0050] The circuits and controls involved in this utility model are all existing technologies, and will not be described in detail here.

[0051] The above description is merely an embodiment of this utility model and does not limit the patent scope of this utility model. Any equivalent structural or procedural transformations made based on the content of this utility model specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of this utility model.

Claims

1. A cylindrical core direct shear test apparatus, comprising: The substrate (1) and two sets of support plates (11) symmetrically mounted on the upper surface of the substrate (1), with support beams (12) fixedly mounted on the top of the two sets of support plates (11), and two sets of linear guide rails (13) mounted on the substrate (1) between the two sets of support plates (11). The control box (9) is installed on the outer wall of the support plate (11); Its characteristic is that it further includes: The guide rod (2) is provided in two sets. The two sets of guide rods (2) are respectively installed in the through slots opened in the two sets of support plates (11). The two sets of guide rods (2) are slidably installed with lifting plates (21). The upper shear sleeve (22) is fixedly installed on the lifting plate (21). The positive pressure mechanism (3) is installed on the support beam (12) directly above the upper shear sleeve (22). A sliding frame (4) is slidably mounted on two sets of linear guide rails (13), and a connecting column (41) is fixedly mounted on the top of the sliding frame (4). A lower shear sleeve (42) is fixedly mounted on the top of the connecting column (41). A clamping assembly (5) for clamping a cylindrical rock core is mounted on the lower shear sleeve (42). The clamping assembly (5) includes a rectangular sleeve (51). There are four sets of rectangular sleeves (51). The four sets of rectangular sleeves (51) are installed at intervals on the outer side wall of the lower shear sleeve (42). A telescopic plate (52) is slidably mounted inside the four sets of rectangular sleeves (51). A clamping plate (53) is fixedly mounted on one end of the telescopic plate (52) that extends into the lower shear sleeve (42). The support base (6) is fixedly installed on the base plate (1), and the support base (6) is equipped with a side pressing mechanism (7). The displacement sensor (8) is fixedly installed on the substrate (1) and electrically connected to the control box (9). The moving probe of the displacement sensor (8) is fixedly connected to the transmission plate (43), and the transmission plate (43) is fixedly connected to the bottom of the sliding frame (4).

2. The cylindrical core direct shear test apparatus of claim 1, wherein, The bottom end of the rectangular sleeve (51) is provided with a through groove, and the other end of the telescopic plate (52) is fixedly installed with a vertical plate (54). The bottom end of the vertical plate (54) is fixedly installed with a transmission block (55). The bottom end of the transmission block (55) is provided with an arc slope. The clamping assembly (5) also includes a threaded sleeve (56). The threaded sleeve (56) is threaded onto the connecting column (41), and the threaded sleeve (56) is installed with a transmission collar (57) through a connecting rod. The inner side wall of the transmission collar (57) is provided with an inner slope that contacts and cooperates with the arc slope.

3. The apparatus of claim 1, wherein, The positive pressure mechanism (3) includes an electric hydraulic rod (31), which is fixedly installed on the support beam (12) and electrically connected to the control box (9). An installation plate (32) is fixedly installed at the telescopic end of the electric hydraulic rod (31). A connecting spring (33) is fixedly installed at the bottom end of the installation plate (32). A lower pressure plate (34) is fixedly installed at the bottom end of the connecting spring (33). An inner core cylinder (35) that is inserted and matched with the upper shear sleeve (22) is installed on the lower pressure plate (34). Pressure sensors (36) are installed on both sides of the installation plate (32). The pressure sensors (36) are electrically connected to the control box (9).

4. The cylindrical core direct shear test apparatus of claim 3, wherein, The top of the pressure plate (34) is fixedly installed with a limiting sleeve (341), and the bottom of the mounting plate (32) is fixedly installed with a plug rod (321) that is inserted into the limiting sleeve (341).

5. The cylindrical core direct shear test apparatus according to claim 3, characterized in that, The inner core (35) and the lower pressure plate (34) are detachably connected by threads, and the inner diameter of the inner core (35) is adapted to the outer diameter of the cylindrical rock core.

6. The cylindrical core direct shear test apparatus of claim 1, wherein, The side pressure mechanism (7) includes an electric hydraulic rod two (71), which is fixedly installed on the support base (6), and a pressure sensor two (72) is fixedly installed at the telescopic end of the electric hydraulic rod two (71), and a push plate (73) is fixedly installed at the end of the pressure sensor two (72) facing the sliding frame (4).

7. The apparatus of claim 1, wherein, The inner wall of the support plate (11) is fixedly installed with a channel steel (111), and a roller (112) that contacts and cooperates with the end of the rectangular sleeve (51) is installed inside the channel steel (111). Balls (113) that contact and cooperate with the end of the rectangular sleeve (51) are evenly installed at the bottom of the inner cavity of the channel steel (111).

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