Automatic sample preparation device for direct shear test and use method of automatic sample preparation device

Abstract

The invention relates to the technical field of soil mechanics test equipment, in particular to an automatic sample preparation device for a direct shear test and a using method thereof.The automatic sample preparation device comprises a sample loading table, a through groove is formed in the sample loading table, a bearing plate is fixedly connected to the bottom face of the sample loading table, and a weighing machine is installed on the upper surface of the bearing plate; a weighing machine is arranged on the upper surface of the sample loading table, a sample loading lower groove body is placed on the upper surface of the weighing machine, an anti-crushing mechanism is arranged below the sample loading table, the anti-crushing mechanism comprises a connecting plate, a mounting plate is fixedly connected to the left side surface of the connecting plate, and two top plates are fixedly connected to the left side surface of the mounting plate. By means of the device, sample soil placed in the lower sample containing groove body and the upper sample containing groove body can be weighed, the soil in the lower sample containing groove body and the soil in the upper sample containing groove body can be compacted to the specified thickness through cooperation of the compaction mechanism and scale marks, and therefore the density of the sample soil can be controlled; and the accuracy of the direct shear test is further improved.

Description

Technical Field

[0001] The present invention relates to the technical field of soil mechanics test equipment, and particularly relates to an automatic sample preparation device for direct shear tests and a method for using the same. Background Art

[0002] The direct shear test is an important method for evaluating the shear strength of geotechnical materials in the field of civil engineering. It is widely used in fields such as civil engineering, geotechnical engineering, and geological engineering. Through the direct shear test, parameters such as the internal friction angle and cohesion of the soil can be obtained, and these parameters are of great significance for the engineering design and stability analysis of the soil, especially in slope stability analysis, foundation bearing capacity calculation, and the design of tunnels and underground projects.

[0003] A direct shear test device with the publication number CN211955050U meets the test preparation requirements of shear specimens with various structural dimensions and improves the test efficiency of shear specimens; it includes a device test bench, a shear box is arranged on the device test bench, a central test hole is arranged in the shear box, a test sleeve is sleeved in the central test hole, and a shear box upper cover is also arranged on the shear box; a reaction force frame body is arranged outside the shear box, a hydraulic jack is arranged on the reaction force frame body, and a test shear device is arranged on one side of the shear box on the device test bench.

[0004] An assembled in-situ direct shear test device for geotechnical materials with the publication number CN109060500A belongs to the field of geotechnical body testing and is used to solve problems such as large volume, complex disassembly, cumbersome operation, and certain safety risks existing in existing in-situ direct shear instruments. It mainly includes a direct shear box body and a cover plate, and the cover plate is located on the top of the direct shear box body; the direct shear box body is surrounded by a first steel plate, a second steel plate, a third steel plate, and a fourth steel plate.

[0005] Both of the above two direct shear test devices rely on manual operation, have a low degree of automation, and cannot realize automatic sample loading and pushing of soil samples. It is very difficult for operators to accurately grasp the sample density, and there are differences in the sample loading methods and forces among different operators, resulting in poor repeatability of test results and difficulty in meeting the requirements of high-precision tests. In addition, since tools such as hammers are required during the sample loading process, there are safety risks in manual sample loading. Moreover, the loaded device also needs to be manually pushed into the direct shear test instrument. It is found in actual work that this operation is quite laborious, and the stability of the device cannot be guaranteed, and it is easy to shake, resulting in displacement or deformation of the soil sample during the sample loading process, affecting the reliability of the test results. Summary of the Invention

[0006] In view of the deficiencies of the prior art, the present invention provides an automatic sample preparation device for direct shear tests and its usage method to solve the problems of inaccurate density sample loading, safety risks for workers during sample loading, and the laboriousness of manually loading the direct shear test instrument.

[0007] To achieve the above object, the technical solution adopted by the present invention is as follows:

[0008] A sample loading device for direct shear tests includes a sample loading table. A through groove is formed inside the sample loading table. The bottom surface of the sample loading table is fixedly connected to a bearing plate. A weighing device is installed on the upper surface of the bearing plate. A lower sample loading trough is placed on the upper surface of the weighing device. A pressure protection mechanism is arranged below the sample loading table. The pressure protection mechanism includes a connecting plate. The left side surface of the connecting plate is fixedly connected to a mounting plate. The left side surface of the mounting plate is fixedly connected to two top plates. The upper surfaces of the two top plates are both in contact with the bottom surface of the lower sample loading trough. A display is installed on the upper surface of the sample loading table. A compaction mechanism is arranged above the sample loading table. The compaction mechanism includes a second electric push rod and a compaction plate. A scale line is marked on the output shaft of the second electric push rod. An upper sample loading trough is arranged above the sample loading table. A first clamping mechanism is arranged on the right side of the upper sample loading trough. A second clamping mechanism is arranged at the rear of the lower sample loading trough. A horizontal adjustment mechanism is arranged below the sample loading table. The horizontal adjustment mechanism includes a bearing table and a lower support table. The top end of the bearing table is fixedly connected to an intermediate plate. Four fourth electric push rods are installed on the upper surface of the intermediate plate. The output ends of the four fourth electric push rods are all fixedly connected to the bottom surface of the sample loading table. Four columns are fixedly connected to the bottom surface of the lower support table. Universal wheels are installed on the bottom surfaces of the four columns.

[0009] Preferably, the pressure protection mechanism further includes a guiding hopper. The upper surface of the guiding hopper is fixedly connected to the bottom surface of the sample loading table. The outer surface of the mounting plate is slidably connected to the guiding hopper. A matching groove is formed on the bottom surface of the guiding hopper. The outer surface of the connecting plate is slidably connected to the matching groove.

[0010] Preferably, reinforcing plates are fixedly connected to the bottom surfaces of the two top plates. The right side surfaces of the two reinforcing plates are both fixedly connected to the left side surface of the mounting plate. The left side surface of the guiding hopper is fixedly connected to, and the first electric push rod is installed inside.

[0011] Preferably, the compaction mechanism further includes an L-shaped frame. The bottom surface of the L-shaped frame is fixedly connected to the upper surface of the sample loading table. The second electric push rod is installed inside the L-shaped frame. The output shaft of the second electric push rod is fixedly connected to a circular connecting plate. A set of connecting columns is fixedly connected to the bottom surface of the circular connecting plate. The bottom surface of each connecting column is fixedly connected to the compaction plate. A first level gauge is installed inside the compaction plate.

[0012] Preferably, the first clamping mechanism includes a side long support plate, the bottom surface of the side long support plate is fixedly connected to the sample loading table, the upper surface of the side long support plate is fixedly connected to a side long support groove, a first bidirectional electric push rod is installed on the inner wall of the side long support groove, the two output ends of the first bidirectional electric push rod are respectively fixedly connected to second electric push rods, the outer surfaces of the two second electric push rods are both slidably connected to the side long support groove, the output ends of the two second electric push rods are both fixedly connected to side clamping L plates, friction rubber rings are fixedly connected to the inner walls of the two side clamping L plates, and the outer surfaces of the two friction rubber rings are both in contact with the sample loading upper groove body.

[0013] Preferably, the second clamping mechanism includes a rear long support plate, the bottom surface of the rear long support plate is fixedly connected to the sample loading table, the upper surface of the rear long support plate is fixedly connected to a rear long support groove, a second bidirectional electric push rod is installed on the inner wall of the rear long support groove, the two output ends of the second bidirectional electric push rod are respectively fixedly connected to third electric push rods, the outer surfaces of the two third electric push rods are both slidably connected to the rear long support groove, and the output ends of the two third electric push rods are both fixedly connected to rear clamping L plates.

[0014] Preferably, a chute is opened in the inner wall of the lower support table, and the bearing table is slidably connected to the inner wall of the chute.

[0015] Preferably, the lateral adjustment mechanism further includes a turntable, the turntable is fixedly connected to a threaded rod, the threaded rod is rotatably connected to the lower support table, the threaded rod penetrates through the chute, and the outer surface of the threaded rod is threadedly connected to the bearing table.

[0016] Preferably, an arc chamfer is opened on the front surface of the sample loading lower groove body, a sliding arc surface is opened on the inner wall of the through groove, a sample loading box cover is installed above the sample loading upper groove body, and a level two is installed above the sample loading box cover.

[0017] Based on the sample loading method for the direct shear test, the specific steps are as follows:

[0018] Step 1: First, place the sample loading lower groove body inside the through groove and place it on the weighing device, put the specified mass of sample soil into the sample loading lower groove body and level it, and observe through the display whether the mass of the input sample soil is compliant;

[0019] Step 2: Start the first electric push rod to drive the connecting plate, the mounting plate and the two top plates to move so that the top plates support the sample loading lower groove body, start the second electric push rod to drive the circular connecting plate, the connecting column and the compaction plate to compact the sample soil inside the sample loading lower groove body. During this period, observe the scale line to control the distance that the compaction plate compacts downward. Specifying the compaction distance and the specified soil mass can compact the soil to the specified density;

[0020] Step 3: After the test soil inside the lower sample loading tank is compacted, by simultaneously starting two second electric push rods, the side clamping L plates and the upper sample loading tank can be driven to move, so that the upper sample loading tank can be moved above the lower sample loading tank. Starting the first double-direction electric push rod can make the upper sample loading tank fall above the lower sample loading tank. Starting two third electric push rods can make the two rear clamping L plates contact with the lower sample loading tank and the upper sample loading tank. Starting the second double-direction electric push rod can make the two rear clamping L plates clamp the lower sample loading tank and the upper sample loading tank.

[0021] Step 4: Use the steps of S1 and S2 again to compact the test soil inside the upper sample loading tank.

[0022] Step 5: Align the sample loading table with the cross-section of the platform of the direct shear test instrument by using the column and the universal wheels. By using the lateral adjustment mechanism, the left and right positions of the lower sample loading tank and the upper sample loading tank can be adjusted. By starting four fourth electric push rods, the height positions of the lower sample loading tank and the upper sample loading tank can be adjusted.

[0023] Step 6: Starting two third electric push rods can drive the rear clamping L plates to move, and the lower sample loading tank and the upper sample loading tank can be sent into the interior of the test device, and then the direct shear test can be started.

[0024] The beneficial effects of the present invention are as follows:

[0025] 1. By using the cooperation between the weighing device and the display, the present invention can weigh the sample soil placed inside the lower sample loading tank and the upper sample loading tank. By using the cooperation between the compaction mechanism and the scale line, the soil inside the lower sample loading tank and the upper sample loading tank can be compacted to a specified thickness, so that the density of the sample soil can be controlled, and thus the accuracy of the direct shear test is improved.

[0026] 2. By starting the first electric push rod, the present invention can drive the connecting plate, the mounting plate and the two top plates to move, so that the top plates support the lower sample loading tank, thereby avoiding damaging the weighing device when compacting the test soil by using the compaction mechanism.

[0027] 3. By using the turntable, the present invention can facilitate the staff to rotate the threaded rod, drive the sample loading device to slide inside the chute, and adjust the lateral position of the sample loading device, which is convenient for sending the sample loading device into the interior of the test device.

[0028] 4. By using the four fourth electric push rods provided, the present invention can adjust the height of the sample loading device. By using the arc chamfer and the sliding arc surface provided, it is convenient for the lower sample loading tank to slide forward from the inside of the through groove, avoiding the through groove jamming the lower sample loading tank and causing it to be unable to enter the direct shear test instrument. Description of the Drawings

[0029] Figure 1 Schematic three - dimensional structure diagram of the present invention;

[0030] Figure 2 Schematic cross - sectional structure diagram of the sample loading table of the present invention;

[0031] Figure 3 Schematic three - dimensional structure diagram of the sample loading table, through - hole groove, bearing plate, weighing device, lower sample loading tank body and anti - crushing mechanism of the present invention;

[0032] Figure 4 Schematic three - dimensional structure diagram of the compaction mechanism of the present invention;

[0033] Figure 5 Schematic three - dimensional structure diagram of the first clamping mechanism and the upper sample loading tank body of the present invention;

[0034] Figure 6 Schematic three - dimensional structure diagram of the lower sample loading tank body, upper sample loading tank body and second clamping mechanism of the present invention;

[0035] Figure 7 Schematic three - dimensional structure diagram of the lateral adjustment mechanism, column and universal wheel of the present invention;

[0036] Figure 8 Schematic three - dimensional structure diagram of the lower sample loading tank body, upper sample loading tank body, sample loading box cover and level two of the present invention.

[0037] In the figure: 1. Sample loading table; 2. Through - hole groove; 3. Bearing plate; 4. Weighing device; 5. Display; 6. Lower sample loading tank body; 71. Arc chamfer; 72. Sliding - out arc surface; 8. Anti - crushing mechanism; 801. First electric push rod; 802. Connecting plate; 803. Guide hopper; 804. Matching groove; 805. Mounting plate; 806. Top plate; 807. Reinforcing plate; 808. Fixed support ring; 9. Compaction mechanism; 901. Second electric push rod; 902. Circular connecting plate; 903. Connecting column; 904. Compaction plate; 905. Level one; 906. L - shaped frame; 10. Scale line; 11. First clamping mechanism; 1101. Side long support plate; 1102. Side long support groove; 1103. First double - acting electric push rod; 1104. Second electric push rod; 1105. Side clamping L - plate; 1106. Friction rubber ring; 12. Upper sample loading tank body; 13. Second clamping mechanism; 1301. Rear long support plate; 1302. Rear long support groove; 1303. Second double - acting electric push rod; 1304. Third electric push rod; 1305. Rear clamping L - plate; 14. Intermediate plate; 15. Fourth electric push rod; 16. Lateral adjustment mechanism; 1601. Turntable; 1602. Threaded rod; 1603. Bearing table; 1604. Lower support table; 1605. Chute; 17. Column; 18. Universal wheel; 19. Sample loading box cover; 20. Level two. Specific Embodiments

[0038] The following will describe the embodiments of the present invention in detail with reference to the accompanying drawings. Those skilled in the art should understand that these embodiments are only used to explain the technical principle of the present invention and are not intended to limit the protection scope of the present invention.

[0039] The following describes the specific implementation of the present invention in detail in combination with specific embodiments.

[0040] Embodiment 1

[0041] A sample loading device for a direct shear test includes a sample loading table 1. A through groove 2 is provided inside the sample loading table 1. A bearing plate 3 is fixedly connected to the bottom surface of the sample loading table 1. A weighing device 4 is installed on the upper surface of the bearing plate 3. A lower sample loading trough 6 is placed on the upper surface of the weighing device 4. A display 5 is installed on the upper surface of the sample loading table 1. By setting the display 5, it is convenient to observe the mass of the test soil. The lower sample loading trough 6 is placed inside the through groove 2 and there is no friction between it and the through groove 2, avoiding affecting the weighing of the mass of the test sample soil.

[0042] A compaction mechanism 9 is provided above the sample loading table 1. The compaction mechanism 9 includes a second electric push rod 901 and a compaction plate 904. The compaction mechanism 9 further includes an L-shaped frame 906. The height of the L-shaped frame 906 is a specified height. A scale line 10 is marked on the output shaft of the second electric push rod 901. When the scale line 10 is marked on the output shaft of the second electric push rod 901, the length of the extension of the second electric push rod 901 can be observed, and the thickness of the compaction of the test soil in the lower sample loading trough 6 can be judged.

[0043] The bottom surface of the L-shaped frame 906 is fixedly connected to the upper surface of the sample loading table 1. The second electric push rod 901 is installed inside the L-shaped frame 906. The output shaft of the second electric push rod 901 is fixedly connected to a circular connecting plate 902. A group of connecting columns 903 are fixedly connected to the bottom surface of the circular connecting plate 902. The bottom surface of each connecting column 903 is fixedly connected to the compaction plate 904. A level 905 is installed inside the compaction plate 904. Using a group of connecting columns 903 to connect the circular connecting plate 902 and the compaction plate 904 can provide space for the installation of the level 905, facilitating the control of the levelness of the test soil when compacting the soil.

[0044] A pressure-proof mechanism 8 is provided below the sample loading table 1. The pressure-proof mechanism 8 includes a connecting plate 802. The left side surface of the connecting plate 802 is fixedly connected with a mounting plate 805. The left side surface of the mounting plate 805 is fixedly connected with two top plates 806. The upper surfaces of the two top plates 806 are both in contact with the bottom surface of the lower sample loading tank 6. By using the top plates 806, it can play a role in supporting and strengthening when the compaction mechanism 9 compacts the sample soil in the lower sample loading tank 6, and avoid damaging the weighing device 4 that mainly uses a piezoresistor due to excessive pressure.

[0045] The pressure-proof mechanism 8 further includes a guiding hopper 803. The upper surface of the guiding hopper 803 is fixedly connected with the bottom surface of the sample loading table 1. The outer surface of the mounting plate 805 is slidably connected with the guiding hopper 803. A matching groove 804 is formed in the bottom surface of the guiding hopper 803. The outer surface of the connecting plate 802 is slidably connected with the matching groove 804. By using the matching groove 804, it can guide the connecting plate 802 when it moves, and the mounting plate 805 slides inside the guiding hopper 803.

[0046] The bottom surfaces of the two top plates 806 are both fixedly connected with reinforcing plates 807. The right side surfaces of the two reinforcing plates 807 are both fixedly connected with the left side surface of the mounting plate 805. The left side surface of the guiding hopper 803 is fixedly connected with a fixed support ring 808. The first electric push rod 801 is installed inside the fixed support ring 808. By using the fixed support ring 808, it can play a supporting role for the first electric push rod 801.

[0047] A upper sample loading tank 12 is provided above the sample loading table 1. A first clamping mechanism 11 is provided on the right side of the upper sample loading tank 12. The first clamping mechanism 11 includes a long side support plate 1101. The bottom surface of the long side support plate 1101 is fixedly connected with the sample loading table 1. The upper surface of the long side support plate 1101 is fixedly connected with a long side support groove 1102. By using the long side support plate 1101, it can support the whole first clamping mechanism 11 and clamp the upper sample loading tank 12 at a suitable height.

[0048] A first double-directional electric push rod 1103 is installed on the inner wall of the long side support groove 1102. The two output ends of the first double-directional electric push rod 1103 are respectively fixedly connected with second electric push rods 1104. The outer surfaces of the two second electric push rods 1104 are both slidably connected with the long side support groove 1102. The output ends of the two second electric push rods 1104 are both fixedly connected with side clamping L plates 1105. Friction rubber rings 1106 are fixedly connected to the inner walls of the two side clamping L plates 1105. The outer surfaces of the two friction rubber rings 1106 are both in contact with the upper sample loading tank 12. By using the friction rubber rings 1106, it can play a role in firmly clamping the upper sample loading tank 12.

[0049] A second clamping mechanism 13 is provided at the rear side of the sample loading lower tank body 6. The second clamping mechanism 13 includes a rear long support plate 1301. The bottom surface of the rear long support plate 1301 is fixedly connected to the sample loading table 1. A rear long support groove 1302 is fixedly connected to the upper surface of the rear long support plate 1301. A second bidirectional electric push rod 1303 is installed on the inner wall of the rear long support groove 1302. Third electric push rods 1304 are fixedly connected to the output ends on both sides of the second bidirectional electric push rod 1303. The outer surfaces of the two third electric push rods 1304 are both slidably connected to the rear long support groove 1302. The output ends of the two third electric push rods 1304 are both fixedly connected to rear clamping L-shaped plates 1305. The center of the wrapping surface of the rear clamping L-shaped plate 1305 is located between the sample loading lower tank body 6 and the sample loading upper tank body 12. The rear clamping L-shaped plate 1305 does not interfere with the side clamping L-shaped plate 1105 in the cross-sectional position.

[0050] The working principle of this embodiment: First, place the sample loading lower tank body 6 into the through groove 2 and place it on the weighing device 4. The staff can directly put the specified mass of test soil into the sample loading lower tank body 6 and level it, and observe the weight of the input test soil through the display 5. Start the first electric push rod 801 to drive the connecting plate 802, the mounting plate 805 and the two top plates 806 to move so that the top plates 806 support the sample loading lower tank body 6. Start the second electric push rod 901 to drive the circular connecting plate 902, the connecting column 903 and the compaction plate 904 to compact the test soil inside the sample loading lower tank body 6. By observing the scale line 10 to control the downward compaction distance of the compaction plate 904, the density of the test soil can be controlled by the mass and compaction volume of the test soil. After the test soil inside the sample loading lower tank body 6 is compacted, by synchronously starting the two second electric push rods 1104, the side clamping L-shaped plates 1105 and the sample loading upper tank body 12 can be driven to move, so that the sample loading upper tank body 12 can be moved above the sample loading lower tank body 6. By starting the first bidirectional electric push rod 1103, the two second electric push rods 1104 can be driven to move in the direction away from each other, so that the sample loading upper tank body 12 can fall above the sample loading lower tank body 6. By starting the two third electric push rods 1304, the two rear clamping L-shaped plates 1305 can be driven to contact the sample loading lower tank body 6 and the sample loading upper tank body 12. By starting the second bidirectional electric push rod 1303, the two third electric push rods 1304 can be driven to move, so that the two rear clamping L-shaped plates 1305 can clamp the sample loading lower tank body 6 and the sample loading upper tank body 12. Then, use the anti-crushing mechanism 8 and the compaction mechanism 9 to compact the test soil inside the sample loading upper tank body 12 layer by layer, and the sample loading for the direct shear test can be completed.

[0051] Embodiment 2

[0052] A horizontal adjustment mechanism 16 is provided below the sample loading table 1. The horizontal adjustment mechanism 16 includes a bearing table 1603 and a lower support table 1604. The bottom surface of the turntable 1601 is fixedly connected with four columns 17, and universal wheels 18 are installed at the bottom surfaces of the four columns 17. Through the cooperation of the columns 17 and the universal wheels 18, the device after sample loading can be moved to the side of the direct shear test instrument.

[0053] The top end of the bearing table 1603 is fixedly connected with an intermediate plate 14. Four fourth electric push rods 15 are installed on the upper surface of the intermediate plate 14. The output ends of the four fourth electric push rods 15 are fixedly connected with the bottom surface of the sample loading table 1. The four fourth electric push rods 15 are controlled by the same controller, and the height of the sample loading device can be adjusted.

[0054] A chute 1605 is opened on the inner wall of the lower support table 1604. The bearing table 1603 is slidably connected with the inner wall of the chute 1605. The chute 1605 can guide the movement of the bearing table 1603. The horizontal adjustment mechanism 16 further includes a turntable 1601. The right side surface of the turntable 1601 is fixedly connected with a threaded rod 1602. The threaded rod 1602 penetrates through the turntable 1601 and extends to the inner side wall of the chute 1605, and the threaded rod 1602 is rotatably connected with the turntable 1601 and the inner side wall of the chute 1605. The outer surface of the threaded rod 1602 is threadedly connected with the bearing table 1603. By using the turntable 1601, it is convenient for the staff to rotate the threaded rod 1602, which can drive the bearing table 1603 to slide inside the chute 1605, and then the position of the sample loading device can be adjusted, facilitating the feeding of the sample loading device into the test device.

[0055] An arc chamfer 7a is opened on the front surface of the sample loading lower trough 6. A sliding arc surface 7b is opened on the inner wall of the through groove 2. A sample loading box cover 19 is installed above the sample loading upper trough 12. A second level 20 is installed above the sample loading box cover 19. By using the provided second level 20, the levelness of the test soil inside the sample loading lower trough 6 and the sample loading upper trough 12 can be measured. By using the provided arc chamfer 7a and sliding arc surface 7b, it is convenient for the sample loading lower trough 6 to slide forward from the inside of the through groove 2.

[0056] Embodiment 3

[0057] The usage method of the sample loading device based on the direct shear test is as follows:

[0058] S1. First, place the sample loading lower trough 6 inside the through groove 2 and on the weighing device 4, put a specified mass of sample soil into the sample loading lower trough 6 and level it, and observe through the display 5 whether the mass of the put-in sample soil complies with the regulations.

[0059] S2. Start the first electric push rod 801 to drive the connecting plate 802, the mounting plate 805 and the two top plates 806 to move, so that the top plates 806 support the sample loading lower tank body 6. Start the second electric push rod 901 to drive the circular connecting plate 902, the connecting column 903 and the compaction plate 904 to compact the sample soil inside the sample loading lower tank body 6. During this process, observe the scale line 10 to control the downward compaction distance of the compaction plate 904. The specified compaction distance and the specified soil mass can compact the soil to the specified density;

[0060] S3. After the sample soil inside the sample loading lower tank body 6 is compacted, by simultaneously starting the two second electric push rods 1104, the side clamping L plates 1105 and the sample loading upper tank body 12 can be driven to move, so that the sample loading upper tank body 12 can move above the sample loading lower tank body 6. Starting the first double - acting electric push rod 1103 can make the sample loading upper tank body 12 fall above the sample loading lower tank body 6. Starting the two third electric push rods 1304 can make the two rear clamping L plates 1305 contact the sample loading lower tank body 6 and the sample loading upper tank body 12. Starting the second double - acting electric push rod 1303 can make the two rear clamping L plates 1305 clamp the sample loading lower tank body 6 and the sample loading upper tank body 12;

[0061] S4. Use the steps of S1 and S2 again to compact the test soil inside the sample loading upper tank body 12;

[0062] S5. Align the sample loading table 1 with the cross - section of the platform of the direct shear test instrument by using the column 17 and the universal wheels 18. By using the lateral adjustment mechanism 16, the left - right positions of the sample loading lower tank body 6 and the sample loading upper tank body 12 can be adjusted. By starting the four fourth electric push rods 15, the height positions of the sample loading lower tank body 6 and the sample loading upper tank body 12 can be adjusted;

[0063] S6. Start the two third electric push rods 1304 to drive the rear clamping L plates 1305 to move, and then the sample loading lower tank body 6 and the sample loading upper tank body 12 can be sent into the interior of the test device, and the direct shear test can be started.

[0064] It should be noted that in the description of the present invention, the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating directions or position relationships, are based on the directions or position relationships shown in the drawings. This is only for the convenience of description and does not indicate or imply that the device or element must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it cannot be understood as a limitation of the present invention. In addition, the terms "first", "second", "third" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0065] In addition, it should be noted that in the description of the present invention, unless otherwise clearly specified and defined, the terms "installed", "connected", and "coupled" should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral connection; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the communication inside two components. For those skilled in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0066] So far, the technical solutions of the present invention have been described in conjunction with the preferred embodiments shown in the drawings. However, it is easy for those skilled in the art to understand that the protection scope of the present invention is obviously not limited to these specific embodiments. Without departing from the principle of the present invention, those skilled in the art can make equivalent changes or substitutions to the relevant technical features, and the technical solutions after these changes or substitutions will all fall within the protection scope of the present invention.

Claims

1. A sample loading device for direct shear test and a method for using the same, comprising a sample loading platform (1), characterized in that: A through groove (2) is provided inside the sample loading platform (1); a carrying plate (3) is fixedly connected to the bottom surface of the sample loading platform (1); a weighing device (4) is installed on the upper surface of the carrying plate (3); a sample loading lower tank (6) is placed on the upper surface of the weighing device (4); an anti-crushing mechanism (8) is provided below the sample loading platform (1); the anti-crushing mechanism (8) comprises a connecting plate (802); a mounting plate (805) is fixedly connected to the left side of the connecting plate (802); the mounting plate (805) The left side of the sample loading platform (1) is fixedly connected to two top plates (806), the upper surfaces of the two top plates (806) are in contact with the bottom surface of the sample loading lower tank (6); a display (5) is installed on the upper surface of the sample loading platform (1); a compaction mechanism (9) is arranged above the sample loading platform (1), the compaction mechanism (9) comprises a second electric push rod (901) and a compaction plate (904), the second electric push rod (901) is arranged on an L-shaped frame (906), and the L-shaped frame (906) is connected to the sample loading platform (1) is fixedly connected; the output shaft of the second electric push rod (901) is engraved with a scale line (10); the compacting plate (904) is fixed on the output shaft of the second electric push rod (901); an upper sample loading groove (12) is arranged above the sample loading platform (1), a first clamping mechanism (11) is arranged on the right side of the upper sample loading groove (12), a second clamping mechanism (13) is arranged on the rear side of the lower sample loading groove (6), and a lateral adjustment mechanism (16) is arranged below the sample loading platform (1) ), the lateral adjustment mechanism (16) comprises a bearing platform (1603) and a lower supporting platform (1604), the top of the bearing platform (1603) is fixedly connected to an intermediate plate (14), the upper surface of the intermediate plate (14) is equipped with four fourth electric push rods (15), the output ends of the fourth electric push rods (15) are fixedly connected to the bottom surface of the sample loading platform (1); a column (17) is provided at the bottom of the lower supporting platform (1604), and a universal wheel (18) is provided at the bottom of the column (17).

2. A sample loading device for direct shear test according to claim 1, characterized in that: The anti-crushing mechanism (8) further comprises a guide bucket (803), the upper surface of the guide bucket (803) being fixedly connected to the bottom surface of the sample loading platform (1), the outer surface of the mounting plate (805) being slidably connected to the guide bucket (803), the bottom surface of the guide bucket (803) being provided with a matching groove (804), and the outer surface of the connecting plate (802) being slidably connected to the matching groove (804).

3. A sample loading device for direct shear test according to claim 2, characterized in that: The bottom surface of the top plate (806) is fixedly connected to a reinforcement plate (807), the right side surface of the reinforcement plate (807) is fixedly connected to the left side surface of the mounting plate (805), the left side surface of the guide bucket (803) is fixedly connected to a fixed support ring (808), and the first electric push rod (801) is installed inside the fixed support ring (808).

4. A sample loading device for direct shear test according to claim 1, characterized in that: A level gauge (905) is provided inside the compacting plate (904).

5. A sample loading device for direct shear test according to claim 1, characterized in that: The first clamping mechanism (11) comprises a side length support plate (1101), the side length support plate (1101) is fixedly connected to the sample loading platform (1), a side length support groove (1102) is fixedly connected to the side length support groove (1102), a first bidirectional electric push rod (1103) is installed on the inner wall of the side length support groove (1102), the output ends of the first bidirectional electric push rod (1103) are respectively fixedly connected to the second electric push rod (1104), the outer surface of the second electric push rod (1104) is slidably connected to the side length support groove (1102), the output end of the second electric push rod (1104) is fixedly connected to the side clamping L plate (1105), the inner wall of the side clamping L plate (1105) is fixedly connected to the friction rubber ring (1106), and the outer surface of the friction rubber ring (1106) is in contact with the sample loading upper groove body (12).

6. A sample loading device for direct shear test according to claim 1, characterized in that: The second clamping mechanism (13) comprises a rear long support plate (1301), the rear long support plate (1301) is fixedly connected to the sample loading platform (1), a rear long support groove (1302) is fixedly connected to the rear long support plate (1301), a second bidirectional electric push rod (1303) is installed on the inner wall of the rear long support groove (1302), the output ends on both sides of the second bidirectional electric push rod (1303) are respectively fixedly connected to third electric push rods (1304), the outer surface of the third electric push rod (1304) is slidably connected to the rear long support groove (1302), and the output end of the third electric push rod (1304) is fixedly connected to a rear clamping L-plate (1305).

7. A sample loading device for direct shear test according to claim 1, characterized in that: The inner wall of the lower support platform (1604) is provided with a slide groove (1605), and the bearing platform (1603) is slidably connected to the inner wall of the slide groove (1605).

8. A sample loading device for direct shear test according to claim 8, characterized in that: The lateral adjustment mechanism (16) further comprises a rotating disk (1601), the rotating disk (1601) being fixedly connected to a threaded rod (1602), the threaded rod (1602) being fixedly connected to the rotating disk (1601), the threaded rod (1602) being rotatably connected to a lower support platform (1604), the threaded rod (1602) passing through a slide groove (1605), and the outer surface of the threaded rod (1602) being threadedly connected to the support platform (1603).

9. A sample loading device for direct shear test according to claim 1, characterized in that: The front surface of the lower sample loading tank (6) is provided with an arc chamfer (71), and the inner wall of the through slot (2) is provided with a sliding arc surface (72); a sample loading box cover (19) is installed above the upper sample loading tank (12), and a second level (20) is installed above the sample loading box cover (19).

10. A method for using a sample loading device for a direct shear test according to any one of claims 1 to 9, characterized in that: The specific steps are as follows: S1. First, place the sample loading lower tank (6) inside the through tank (2) and on the weighing device (4), put a specified mass of sample soil into the sample loading lower tank (6) and smooth it, and observe whether the mass of the put-in sample soil is in compliance with the regulations through the display (5); S2, starting the first electric push rod (801) to drive the connecting plate (802), the mounting plate (805) and the two top plates (806) to move, so that the top plate (806) supports the lower sample tank (6), starting the second electric push rod (901), driving the circular connecting plate (902), the connecting column (903) and the compacting plate (904) to compact the sample soil inside the lower sample tank (6), during which the downward compacting distance of the compacting plate (904) is controlled by observing the scale line (10), and the soil is compacted to a specified density according to the compacting distance and soil quality; S3, after the sample soil inside the lower sample loading tank (6) is compacted, the two second electric push rods (1104) are synchronously started to drive the side clamping L plate (1105) and the upper sample loading tank (12) to move, so that the upper sample loading tank (12) moves to the top of the lower sample loading tank (6), the first bidirectional electric push rod (1103) is started to make the upper sample loading tank (12) fall above the lower sample loading tank (6), the two third electric push rods (1304) are started to make the two rear clamping L plates (1305) contact the lower sample loading tank (6) and the upper sample loading tank (12), and the second bidirectional electric push rod (1303) is started to make the two rear clamping L plates (1305) clamp the lower sample loading tank (6) and the upper sample loading tank (12); S4, using steps S1 and S2 again to compact the test soil inside the sample loading upper tank (12); S5. Use the upright column (17) and the universal wheel (18) to align the sample loading platform (1) with the platform cross section of the direct shear test instrument, and use the lateral adjustment mechanism (16) to adjust the left and right positions of the sample loading lower tank body (6) and the sample loading upper tank body (12). By starting the four fourth electric push rods (15), adjust the height positions of the sample loading lower tank body (6) and the sample loading upper tank body (12); S6. Start the two third electric push rods (1304) to drive the rear clamping L plate (1305) to move, and send the sample loading lower trough (6) and the sample loading upper trough (12) into the interior of the test device, and then start the direct shear test.

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