A centering assembly sample device applied to a dynamic true triaxial electromagnetic hopkinson bar and a testing use method thereof

Abstract

The application provides a centering assembly sample device applied to a dynamic true triaxial electromagnetic Hopkinson bar and a testing use method thereof, the device comprising a sample space adjustable centering device, a laser assisted centering positioning device, a detachable three-dimensional centering judging device and a waveguide square rod gasket centering clamp. The device relies on a dynamic true triaxial electromagnetic Hopkinson bar test and test system, provides an assembly sample device and method, breaks through the problems of complex traditional sample assembly process, low precision, poor repeatability and the like, significantly improves the serious wear problem of the waveguide rod and the test sample, ensures the consistency and repeatability of the multi-axial loading stress wave, and provides a technical guarantee for the dynamic true triaxial electromagnetic Hopkinson bar test and test system to carry out the dynamic test of rock, concrete and other materials.

Description

Technical Field

[0001] This invention relates to the field of high-end equipment manufacturing, and in particular to a dynamic true triaxial electromagnetic Hopkinson rod device. Background Technology

[0002] During the construction and operation phases of rock engineering, rock masses are subjected to multiaxial impact loads, leading to severe dynamic disasters, resulting in numerous casualties and property losses. The dynamic true triaxial electromagnetic Hopkinson bar testing system can simultaneously apply dynamic stress waves in three axes and six directions with an arrival error controlled within 5μs, providing a novel testing method for studying the dynamic behavior of materials such as rock and concrete under multiaxial dynamic disturbances. Compared to the traditional pneumatic Hopkinson bar testing system, which only contains two waveguides, the dynamic true triaxial electromagnetic Hopkinson bar testing system has six waveguides. This necessitates ensuring the straightness and perpendicularity of the sample in three axes simultaneously during assembly, significantly increasing the difficulty of precise sample assembly. Traditional sample assembly methods (without auxiliary assembly devices) struggle to ensure the straightness and perpendicularity between the waveguides, the test sample, and the gaskets, potentially leading to eccentric stress on the test sample. This significantly affects the accuracy of the test results (poor consistency in the waveform, pulse width, and amplitude of the loaded stress wave) and further damages the waveguide's lifespan. At the same time, this method is cumbersome to assemble, requiring personal experience to adjust the assembly accuracy of each axis in turn, which has disadvantages such as human error and low efficiency.

[0003] In view of the above problems, existing experimental devices and methods still need further optimization and development. Based on the multi-dimensional adjustment support device and method of patent number CN202410805471.3, this invention provides a novel sample assembly device and method, which achieves high-precision adjustment and alignment determination from the perspectives of horizontality and verticality, overcoming the difficulties of complex, low-precision, and poor repeatability of traditional sample assembly procedures. It can highly repeat the dynamic experimental process, reduce the inherent errors of human error and experimental operation, solve the problem of inconsistent waveforms, amplitudes, and pulse widths during the test due to alignment position differences, and significantly improve the wear between the rod end and the sample. This invention can provide technical support for the scientific design, intelligent construction, and healthy operation and maintenance of deep rock mass engineering under multi-directional disturbance. Summary of the Invention

[0004] To address the problems in the prior art, this invention provides a centering and assembly sample device for a dynamic true triaxial electromagnetic Hopkinson bar, comprising a waveguide square bar spacer centering fixture, a sample support and positioning platform kit, a laser-assisted centering and positioning device, an adjustable sample space centering device, and a detachable three-dimensional centering judgment device. The laser-assisted centering and positioning device includes four laser emitters fixed to a central frame, the four laser emitters being located at the centers of the four sides of the central frame in the Z-axis direction, and the four laser emitters being coplanar. The adjustable sample space centering device is positioned at the bottom center of the central frame. The sample support and positioning platform kit is mounted on the adjustable sample space centering device.

[0005] The adjustable centering device for the sample space includes: an upper top plate, a positive z-axis fixed support, a positive z-axis support bolt, a piston connecting rod, a first sealing plug, a piston connecting rod tube, a negative z-axis support bolt, a negative z-axis fixed support, an inlet valve, an outlet valve, a lower bottom plate, a rotatable base, an angle adjustment bolt, a support fixing pin, a vent pipe, and a piston rod inlet pump; the piston connecting rod, piston connecting rod tube, inlet valve, and outlet valve form a closed air chamber, and a vent pipe is added to connect the air chamber to the piston rod inlet pump; the rotatable base is fixed at the center of each side of the upper top plate and the lower bottom plate, and the positive z-axis fixed support and the negative z-axis fixed support are respectively attached to the upper top plate and the lower bottom plate through their respective rotatable bases and fixed with support fixing pins;

[0006] The top plate and the bottom plate have a central square hole. The size of the central square hole is the same as the size of the sample support and positioning platform kit. The size of this central square hole is larger than the size of the waveguide square rod.

[0007] The waveguide square rod shim centering fixture includes twelve semi-enclosed fixture structures of the same size with concave observation slots. Each semi-enclosed fixture has two symmetrical adsorption slots, and each symmetrical adsorption slot has a magnet inside. The waveguide square rod shim centering fixture places shims at the corresponding positions of the six axes as a buffer between the waveguide square rod and the sample.

[0008] As a further improvement of the present invention, the sample support and positioning platform kit is embedded inside the upper top plate. The sample support and positioning platform kit consists of two parts: a z-positive sample support and positioning platform and a z-negative sample support and positioning platform. The z-negative sample support and positioning platform is located at the lower end and is larger in size than the z-positive sample support and positioning platform. The two platforms form a stepped shape inside, which further centers the sample in the XOY plane. The z-negative sample support and positioning platform is fixed at the position of the central square hole on the upper surface of the adjustable centering device in the sample space. The steps inside the z-positive sample support and positioning platform support the sample and fit the sample. The constraint of the stepped platform makes the sample centered in the XOY plane.

[0009] As a further improvement of the present invention, for a single waveguide square rod spacer centering clamp, the clamp's inclined shape gradually decreases from the middle of the clamp to the edge position near the rod end.

[0010] A testing method for a centering assembly sample device applied to a dynamic true triaxial electromagnetic Hopkinson bar. This method uses a waveguide rod with a square cross-section for position adjustment and testing instructions. It utilizes the centering assembly sample device for a dynamic true triaxial electromagnetic Hopkinson bar described above. After assembling the dynamic true triaxial electromagnetic Hopkinson bar device, the following steps are performed:

[0011] Step 1: Mark the center areas of the four sides of the cubic specimen; mark the center areas of the four sides of the assembled specimen parallel to the z-axis;

[0012] Step 2: Position and coarsely adjust the adjustable centering device for the sample space; fix the adjustable centering device for the sample space to the positive center of the negative Z direction of the central frame, so that the positive center of the square hole of the adjustable centering device for the sample space is concentric and coaxial with the positive center of the waveguide square rod; embed the sample support positioning platform kit into the interior of the adjustable centering device for the sample space; place the sample on the sample support positioning platform kit; coarsely adjust the adjustable centering device for the sample space so that the laser emitted by the laser-assisted centering positioning device is close to the center marking area of ​​the four sides of the sample;

[0013] Step 3: Fine-tune the adjustable centering device for the sample space so that the laser emitted by the laser-assisted centering and positioning device is located in the center marking area of ​​the four sides of the sample.

[0014] Step 4: The sample is clamped by the z-positive waveguide square rod and the z-negative waveguide square rod, shortening the sample space with an adjustable centering device;

[0015] Step 5: Shorten the sample space with adjustable centering device and sample support positioning platform kit. Use waveguide square rod shim centering clamp to hold the shims and waveguide square rods in the four directions of positive x, negative x, positive y, and negative y and press them against the sample.

[0016] Step 6: After the sample is fixed, use the detachable three-dimensional alignment judgment device to determine whether the position of the waveguide rods in each axis needs to be adjusted; orthogonally adjust the x-axis, y-axis, y-axis, z-axis, and z-axis in sequence.

[0017] As a further improvement of the present invention, in step 2, the adjustable centering device for the sample space is positioned and coarsely adjusted. The coarse adjustment method is as follows: rotate the z-positive fixed support and z-negative fixed support relative to the rotatable base, making them parallel to the X-axis and Y-axis respectively. When they are parallel to the X-axis, loosen the tilt adjustment bolts and adjust the upper top plate until it is basically parallel to the lower bottom plate. Then, rotate the z-positive fixed support and z-negative fixed support to be parallel to the Y-axis and adjust the upper top plate until it is basically parallel to the lower bottom plate. When the laser emitted by the laser-assisted centering and positioning device approaches the center marking area of ​​the four sides of the sample, tighten the tilt adjustment bolts and adjust the z-positive fixed support and z-negative fixed support to the locked state. After this operation, the sample is basically adjusted in the XOY plane.

[0018] As a further improvement of the present invention, the specific adjustment method of step 3 is as follows: Adjust the piston rod air pump to increase atmospheric pressure, and at the same time extend the piston connecting rod. First, place a level ruler on the upper top plate plane parallel to the X-axis direction, and adjust the extension length of each piston connecting rod relative to the piston connecting rod tube so that when the level ruler is in this direction, the bubble is at the central scale line position; then place the level ruler parallel to the Y-axis direction and repeat the above operation; when the laser is in the center area of ​​the four sides of the sample, and the bubbles of the orthogonally measured level ruler are all at the central scale line position, it can be considered that the sample is in the center position of the central frame. Use the support fixing pin to fix the support position, and close the air inlet valve and the air outlet valve.

[0019] As a further improvement of the present invention, step 4 is as follows: the z-positive first waveguide square rod spacer centering clamp holds the z-positive waveguide square rod, the z-positive first waveguide square rod spacer centering clamp holds the z-positive spacer, and then the z-positive second waveguide square rod spacer centering clamp and the z-positive first waveguide square rod spacer centering clamp are attracted by a magnet, the z-positive first waveguide square rod spacer centering clamp and the z-positive spacer centering clamp hold the z-positive waveguide square rod and the z-positive spacer, and the z-positive waveguide square rod and the z-positive spacer are tightly attached, the edge of the z-positive spacer is aligned with the front edge edge of the z-positive first waveguide square rod spacer centering clamp and the z-positive second waveguide square rod spacer centering clamp, so that the z-positive spacer and the z-positive waveguide square rod are tightly attached to the sample.

[0020] As a further improvement of the present invention, step 5 is as follows: the operations in the four directions of x-positive, x-negative, y-positive, and y-negative are the same. Taking the x-positive direction as an example, the x-positive first waveguide square rod spacer centering clamp holds the x-positive waveguide square rod, then the x-positive first waveguide square rod spacer centering clamp holds the x-positive spacer, and then the x-positive second waveguide square rod spacer centering clamp and the x-positive first waveguide square rod spacer centering clamp are attracted by a magnet. The x-positive first waveguide square rod spacer centering clamp and the x-positive second waveguide square rod spacer centering clamp hold the x-positive waveguide square rod and the x-positive spacer, and the x-positive waveguide square rod and the x-positive spacer are tightly fitted together. The edge of the x-positive spacer is close to the x-positive first waveguide square rod spacer. The front edges of the waveguide square rod shim centering clamp and the second waveguide square rod shim centering clamp in the positive x direction are aligned so that the positive x-axis shim and the positive x-axis waveguide square rod are tightly attached to the sample. In the same way, the shims and waveguide square rods in the negative x, positive y, and negative y directions are adjusted to be tightly attached to the sample. The presence of soft elastic material inside the waveguide square rod shim centering clamp ensures that the waveguide square rod shim centering clamp is tightly clamped to the shims and the inside of the waveguide square rod. At this time, the shims and waveguide square rods in the five directions of positive x, negative x, positive y, negative y, and positive z clamp the sample to support it. In the negative z direction, the first waveguide square rod shim centering clamp and the second waveguide square rod shim centering clamp in the negative z direction hold the negative z-axis waveguide square rod and the negative z-axis shim.

[0021] As a further improvement of the present invention, step 6 is specifically implemented as follows: A detachable three-dimensional alignment judgment device is installed on the two waveguide square rod spacer alignment fixtures adjacent to the x-axis and y-axis. This device includes an adjustable telescopic worm gear component with a magnetic base. The fixed sleeve is fixed to the fixed magnetic base. The telescopic part of the rod contains a worm gear. The extension and retraction of the movable worm are controlled by a worm knob. A screw hole is provided in the square nut. The movable worm and the worm gear are fixed by gear engagement. The worm knob drives the worm gear, thereby pushing the movable worm to move. The rotatable base rotates, causing the square nut to twist. For the detachable three-dimensional alignment judgment device, the installation standard is as follows: First, the two detachable three-dimensional alignment judgment devices are aligned... The centering judgment device is retracted to its shortest state and attached to the symmetrical adsorption groove using a fixed magnetic base. Simultaneously, the worm gear knob is adjusted to control the extension and retraction length of the movable worm gear. When both movable worm gears are adjusted so that their square nuts are in the same space and collinear, the rotatable bases of both gears can be rotated separately. The worm gear knob is then finely adjusted so that the ends of the two movable worm gears contact and are inserted into the two screw holes of the rotating shaft. The movable worm gears and square nuts rotate relative to the rotating shaft. The included angle between the two detachable three-dimensional centering judgment devices is observed and measured. If the included angle between the gratings of adjacent worm gear axes is not 90°, the assembly process of the sample needs to be readjusted according to whether it is greater than or less than 90°, and the positions of the waveguide rod support seats are adjusted until the two axes are orthogonal.

[0022] As a further improvement of the present invention, the method for adjusting the center position of the waveguide square rod is as follows: The waveguide rod support is provided with adjustment knobs for adjusting forward and backward as well as height. The waveguide rod support supports the end of the waveguide square rod close to the surface of the sample. Adjusting the height and horizontal position of the waveguide rod support controls the spatial position of the center position of the waveguide square rod. When the ends of the six waveguide square rods are in close contact with the corresponding surfaces of the sample, the waveguide square rod adjustment is considered complete.

[0023] The beneficial effects of this invention are:

[0024] (1) Provide a systematic sample assembly method to achieve high-precision and highly repeatable sample assembly, and provide the function of adjusting the horizontality and verticality between the waveguide rod and the gasket.

[0025] (2) Multi-axis coordinated adjustment of the spatial position of multiple degrees of freedom of movement and rotation in the three rectangular coordinate axes of x, y, and z, to ensure faster assembly of the sample.

[0026] (3) Multiple auxiliary devices (waveguide square rod gasket centering clamp, laser-assisted centering and positioning device, and detachable three-dimensional centering judgment device) are used to center the rod and gasket center, the sample space center, and the sample and rod end center in sequence, which work together to improve the accuracy of sample assembly.

[0027] (4) Provide support for the shim during the loading of the sample to ensure that the shim does not twist or shift during the hydraulic movement and fixing of the sample, and to ensure that the sample shim and waveguide rod remain collinear. Attached Figure Description

[0028] Figure 1 It is a three-dimensional diagram of a dynamic true triaxial electromagnetic Hopkinson rod system with an adjustable centering device 9 for the sample space attached.

[0029] Figure 2 It is a partial screenshot of the dynamic true triaxial electromagnetic Hopkinson rod system frame, and a three-dimensional sample diagram showing the installation position of the laser-assisted centering and positioning device 8 and the adjustable centering device 9 in the sample space.

[0030] Figure 3 This is a three-dimensional schematic diagram of a laser-assisted centering and positioning device;

[0031] Figure 4 This is a 3D assembly diagram of the adjustable centering device 9 for the sample space and the sample support and positioning platform kit 6.

[0032] Figure 5 This is a diagram of the adjustable centering device for the sample space and its rotatable base.

[0033] Figure 6 yes Figure 5 A 3D diagram after rotation;

[0034] Figure 7 This is a top-view three-dimensional schematic diagram of the adjustable centering device for the sample space;

[0035] Figure 8a This is a three-dimensional exploded view of the rotatable base in the adjustable centering device for the sample space;

[0036] Figure 8b This is a schematic diagram showing the positional relationship between the top plate 901 and the rotatable base 912;

[0037] Figure 8c This is a schematic diagram showing the positional relationship between the lower base plate 911 and the rotatable base 912;

[0038] Figure 9 This is a 3D diagram of the sample support and positioning platform kit;

[0039] Figure 10 This is a three-dimensional schematic diagram of a piston connecting rod tube intake pump;

[0040] Figure 11 This is a three-dimensional schematic diagram of the waveguide rod mounting bracket centering fixture;

[0041] Figure 12 This is an exploded view of the waveguide rod mounting bracket centering fixture;

[0042] Figure 13 This is a top view showing the positional relationship between the rods and washers in the xoy plane;

[0043] Figure 14 This is a schematic diagram of the centering fixture for a single waveguide square rod gasket, showing the position of the gasket and the sample.

[0044] Figure 15 This is a top view of a single waveguide square rod spacer clamping spacer and sample;

[0045] Figure 16 This is a 3D view of the waveguide square rod spacer centering clamp.

[0046] Figure 17 This is a 3D front view of a single waveguide square rod spacer centering clamp;

[0047] Figure 18 yes Figure 17 Rear view;

[0048] Figure 19 yes Figure 17 Side view;

[0049] Figure 20 yes Figure 17 Top view;

[0050] Figure 21 This is a 3D diagram of a dynamic true triaxial electromagnetic Hopkinson rod system with a detachable 3D alignment judgment device and fixture.

[0051] Figure 22 This is a three-dimensional schematic diagram of the method for temporarily fixing four waveguide rods on the xoy horizontal plane of the sample.

[0052] Figure 23 This is a 3D schematic diagram of a single detachable 3D alignment judgment device;

[0053] Figure 24 This is a 3D schematic diagram of a pair of detachable 3D alignment judgment devices;

[0054] Figure 25 This is a detachable three-dimensional alignment judgment device and a three-dimensional schematic diagram of the fixture installation position.

[0055] The names of the components in the diagram are as follows: Dynamic True Triaxial Electromagnetic Hopkinson Rod 1, Waveguide Rod Support 2, Waveguide Square Rod 3, X-direction Positive Waveguide Square Rod 301, X-direction Negative Waveguide Square Rod 302, Y-direction Positive Waveguide Square Rod 303, Y-direction Negative Waveguide Square Rod 304, Z-direction Positive Waveguide Square Rod 305, Z-direction Negative Waveguide Square Rod 306, Shim 4, X-direction Positive Shim 401, X-direction Negative Shim 402, Y-direction Positive Shim 403, Y-direction Negative Shim 404, Z-direction Positive Shim 405, Z-direction Negative Shim 406, Waveguide Square Rod Shim Centering Clamp 5, X-direction Positive First Waveguide Square Rod Shim Centering Clamp 501, X-direction... Centering clamps for the second waveguide square rod spacer 502, X-negative first waveguide square rod spacer 503, X-negative second waveguide square rod spacer 504, Y-positive first waveguide square rod spacer set 505, Y-positive second waveguide square rod spacer 506, Y-negative first waveguide square rod spacer 507, Y-negative second waveguide square rod spacer 508, Z-positive first waveguide square rod spacer 509, Z-positive second waveguide square rod spacer 510, Z-negative first waveguide square rod spacer 511, and Z-negative second waveguide square rod spacer 511. Square rod gasket centering clamp 512, symmetrical adsorption groove 513, sample support and positioning platform kit 6, z-positive sample support and positioning platform 601, z-negative sample support and positioning platform 602, vent pipe 7, laser-assisted centering and positioning device 8, first laser centering positioner 801, second laser centering positioner 802, third laser centering positioner 803, fourth laser centering positioner 804, adjustable sample space centering device 9, top plate 901, z-positive fixed support 902, z-positive support bolt 903, piston connecting rod 904, first sealing plug 905, piston connecting rod tube 906, z-negative support bolt, 907, z-negative fixed support, 908, inlet valve, 909, outlet valve, 910, lower base plate, 911, rotatable base, 912, tilt adjustment bolt, 913, support fixing pin, 914, center frame, 10, piston rod inlet pump, 11, detachable three-dimensional alignment judgment device, 12, square nut, 1201, screw hole, 1202, movable worm gear, 1203, worm gear, 1204, fixed sleeve, 1205, fixed magnetic base, 1206, rotatable base, 1207, worm knob, 1208, worm engraving, 1209, sample, 13. Detailed Implementation

[0056] The invention will now be further described with reference to the accompanying drawings.

[0057] Specific Implementation Method 1: A centering and assembly sample device for a dynamic true triaxial electromagnetic Hopkinson bar mainly consists of five parts: a laser-assisted centering and positioning device 8, an adjustable centering device for the sample space 9, a sample support and positioning platform kit 6, a waveguide square bar pad centering clamp 5, and a detachable three-dimensional centering judgment device 12.

[0058] like Figure 1 As shown, this application is based on the dynamic true triaxial electromagnetic Hopkinson rod 1, and uses waveguide rod support 2 to adjust the overall height and deflection of the waveguide square rod in each axis. This application takes the Y-axis as an example for detailed explanation.

[0059] like Figure 2 and Figure 3 The laser-assisted centering and positioning device 8 includes four laser emitters fixed to the central frame 10, named as follows: first laser centering and positioning device 801, second laser centering and positioning device 802, third laser centering and positioning device 803, and fourth laser centering and positioning device 804. The midpoints of the four vertical sides of the central frame 10 are located using measurement methods. The four laser centering and positioning devices are located at the centers of the four sides of the central frame 10 in the Z-axis direction, and the four laser centering and positioning devices are coplanar.

[0060] The adjustable centering device 9 of the sample space controls the horizontal and vertical spatial position adjustment of the sample. The adjustable centering device 9 is located at the bottom center of the central frame 10, and its lower base plate 911 is fixed to the bottom of the central frame 10. For example... Figures 4 to 10 As shown, the adjustable centering device 9 for the sample space includes: an upper top plate 901, a z-positive fixed support 902, a z-positive support bolt 903, a piston connecting rod 904, a first sealing plug 905, a piston connecting rod tube 906, a z-negative support bolt 907, a z-negative fixed support 908, an air inlet valve 909, an air outlet valve 910, a lower bottom plate 911, a rotatable base 912, an tilt adjustment bolt 913, a support fixing pin 914, a vent pipe 7, and a piston rod air inlet pump 11.

[0061] Among them, the z-positive support bolt 903 and the z-positive fixed support 902 are connected by hinge, the first sealing plug 905 is connected to the upper end of the piston connecting rod tube 906 by internal thread, and the z-negative support bolt 907 is fixed to the lower end of the piston connecting rod tube 906 by thread.

[0062] like Figure 4 and Figure 10 As shown, the piston connecting rod 904, piston connecting rod tube 906, air inlet valve 909 and air outlet valve 910 form a closed air chamber. The air inlet pump 11 connected to the air chamber is connected to the air pipe 7. By combining the above components, the air pressure in the piston connecting rod tube 906 is adjusted, thereby lengthening and shortening the piston connecting rod 904, and thus controlling the change in the plane height of the upper top plate 901.

[0063] like Figure 8a , Figure 8b and Figure 8c As shown, the rotatable base 912 is fixed at the center of each side of the upper top plate 901 and the lower bottom plate 911, as follows: Figure 4As shown, the z-positive fixed support 902 and z-negative fixed support 908 are respectively attached to the upper top plate 901 and the lower bottom plate 911 via their respective rotatable bases 912 and are fixed with support fixing pins 914. During rotation, the rotatable base 912 remains in a fixed position, while the z-positive fixed support 902 and z-negative fixed support 908 rotate relative to the rotatable base 912. Note: Figure 8a Exploded views of the rotatable base 912, tilt adjustment bolt 913, and support fixing pin 914 at the z-negative fixed support 908 are given. The structures at the z-positive fixed support 902 and the z-negative fixed support 908 are the same.

[0064] like Figure 4 and Figure 5 As shown, the adjustment of the adjustable centering device 9 for the sample space requires leveling the upper top plate 901. The leveling of the upper top plate 901 is jointly controlled by the z-positive fixed support 902 corresponding to the upper top plate 901, the z-negative fixed support 908 corresponding to the lower bottom plate 911, the rotatable base 912, and the tilt adjustment bolt 913. Figure 8a It can be seen that after the support fixing pin 914 is removed from the upper top plate 901 and the lower bottom plate 911, the z-positive fixed support 902 and z-negative fixed support 908 can rotate relative to the rotatable base. Since the adjustment needs to be made in the two mutually perpendicular directions X and Y in the horizontal plane, each rotation of the z-positive fixed support 902 and z-negative fixed support 908 is 90 degrees. Twist the z-positive fixed support 902 and z-negative fixed support 908 relative to the rotatable base to the required adjustment direction. At this time, loosen the tilt adjustment bolt 913 to adjust the overall tilt and the horizontal plane of the upper top plate 901. After adjusting to the horizontal plane of the upper top plate 901, lock the z-negative fixed support 908 by inserting the support fixing pin 914 into the hole in the lower bottom plate 911. When the support fixing pin 914 is inserted, the rotatable base 912 will be fixed to the lower bottom plate 911 and cannot rotate. Tighten the tilt adjustment bolt 913 so as not to affect the testing process.

[0065] Combined with the centering position of the laser-assisted centering and positioning device 8, the air pressure of the air inlet valve 909 of the four piston connecting rod tube 906 is adjusted, and the center positions on the four vertical sides of the sample 13 are marked. The laser beams emitted by the four laser emitters of the laser-assisted centering and positioning device 8 are precisely adjusted so that the laser beams are respectively aligned with the center positions on the four vertical sides of the sample 13. It can be considered that the center of the sample in the Z negative direction, the center of the waveguide square rod 306 in the Z negative direction, and the center of the gasket 406 in the Z negative direction are collinear and in the centering position. Then the air outlet valve 910 is closed.

[0066] The upper top plate 901 and the lower bottom plate 911 have a central square hole. The size of the central square hole is the same as that of the sample support and positioning platform kit 6. This central square hole is larger than the size of the waveguide rod 3, allowing the waveguide rod to pass through without affecting the test. Preferably, it is 55mm*55mm. The size of the central square hole in the upper top plate 901 and the lower bottom plate 911 ensures that the three devices—the adjustable centering device 9, the sample support and positioning platform kit 6, and the laser-assisted centering and positioning device 8—have sufficient space to be concentric and coaxial with respect to the position of the central square hole, and the size of the central square hole does not obstruct the swaying stroke of the waveguide rod 3 during the loading process.

[0067] Figure 9 This is the specimen support and positioning platform kit 6. The specimen support and positioning platform kit 6 is mounted on the adjustable centering device 9 in the specimen space and is embedded inside the upper top plate 901. It consists of two parts: a z-positive specimen support and positioning platform 601 and a z-negative specimen support and positioning platform 602. The z-negative specimen support and positioning platform 602 is located at the lower end and is larger than the z-positive specimen support and positioning platform 601. The two platforms form a stepped structure inside, further centering the specimen in the XOY plane. Figure 6 and Figure 7 As shown, the z-negative sample support positioning platform 602 is fixed at the position of the central square hole on the upper surface of the top plate 901 of the adjustable centering device 9 in the sample space. The internal steps of the z-positive sample support positioning platform 601 support the sample and fit the sample. The constraint of the stepped platform makes the sample located at the center position on the XOY plane.

[0068] like Figures 11 to 20 The image shows the waveguide square rod spacer centering clamp 5. The waveguide square rod spacer centering clamp 5 comprises twelve identical semi-enclosed clamp structures with concave observation slots, named as follows: X-direction first waveguide square rod spacer centering clamp 501, X-direction second waveguide square rod spacer centering clamp 502, X-direction first waveguide square rod spacer centering clamp 503, X-direction second waveguide square rod spacer centering clamp 504, and Y-direction first waveguide square rod spacer centering clamp sleeve. Item 505, Y-positive second waveguide square rod shim centering clamp; 506, Y-negative first waveguide square rod shim centering clamp; 507, Y-negative second waveguide square rod shim centering clamp; 508, Z-positive first waveguide square rod shim centering clamp; 509, Z-positive second waveguide square rod shim centering clamp; 510, Z-negative first waveguide square rod shim centering clamp; 511, Z-negative second waveguide square rod shim centering clamp; 512.

[0069] like Figure 11Each semi-enclosed clamp in the waveguide square rod spacer centering fixture 5 has two symmetrical adsorption grooves 513, and each symmetrical adsorption groove 513 contains a magnet. A set of clamps (two) are symmetrically arranged in pairs along one axis and installed at the end edge of the waveguide rod near the sample. For a single waveguide square rod spacer centering fixture 5, the tail of the clamp is slightly larger, and the position near the rod end is smaller. It can be a slope as shown in the figure, or it can be set as a step, etc. The front end is smaller, more compact, and more conducive to clamping the spacer and the end of the waveguide rod, such as... Figures 17-20 The waveguide rod spacer centering fixture uses transparent resin material, which has advantages such as high precision, resistance to deformation at contact points, and suitability for model assembly. The concave structure uses a soft, elastic material to achieve adjustable clamping, with a controllable sample assembly range of 50-52mm. The transparent resin material provides visibility into the alignment status between the center of the waveguide rod 3 and the center of the spacer 4. The waveguide rod spacer centering fixture 5 places spacers 4 at corresponding positions on each of the six axes as buffers between the waveguide rod 3 and the sample. Their function is to reduce wear on the waveguide rod 3, ensure alignment and prevent misalignment between the rod end and the sample loading end during loading, control the centering level of samples with different side lengths, and make the assembly process more accurate and applicable.

[0070] When the waveguide rod 3 and the gasket 4 are clamped by the waveguide rod 5 centering fixture 5, the first semi-enclosed fixture structure is nested on the side of the waveguide rod and the gasket is inserted. Then, the second semi-enclosed fixture structure is attached to the first semi-enclosed fixture structure by magnets in the symmetrical adsorption groove 513 to form a set of fixtures. By utilizing different clamping tightness, the fixtures clamp samples and gaskets of different sizes, making the center of the sample, the center of the gasket, and the center of the waveguide rod collinear, thus achieving the centering function. Taking the negative Y-axis direction as an example, when assembling the sample, the assembly of the negative Y-axis waveguide rod 304, the negative Y-axis gasket 404, and the negative Y-axis second waveguide rod 404 centering fixture 508 is as follows: Figure 14 As shown.

[0071] like Figure 23 , Figure 24 , Figure 25 The device 12 is a detachable three-dimensional alignment judgment device, which includes an adjustable telescopic worm gear component with a magnetic base. A fixed sleeve 1205 is fixed to the fixed magnetic base 1206. The telescopic part of the rod contains a worm gear, and the extension and retraction of the movable worm 1203 are controlled by a worm knob 1208. A square nut 1201 has a screw hole 1202. The movable worm 1203 and the worm gear 1204 are fixed by gear engagement. The worm knob 1208 can drive the worm gear 1204, thereby pushing the movable worm 1203 to move; the rotatable base 1207 rotates, causing the square nut 1201 to twist.

[0072] Specific Implementation Method 2: A testing and usage method for a centering assembly sample device applied to a dynamic true triaxial electromagnetic Hopkinson bar, including a method for adjusting the position of a waveguide square bar 3 with a waveguide bar size of 50mm*50mm and testing and usage instructions. After the device assembly is completed, the following steps are performed:

[0073] Step 1: Mark the center area of ​​the four sides of the specimen 13; mark the center area of ​​the four sides of the assembled specimen 13 parallel to the z-axis. The range of the center mark is a circle with a radius of no more than 1 mm. The radius here is an explanation of the experimental accuracy requirements.

[0074] Step 2: Position and coarsely adjust the adjustable centering device 9 of the sample space; fix the lower base plate 911 of the adjustable centering device 9 of the sample space to the negative positive center of the central frame 10Z, so that the positive center of the square hole of the lower base plate 911 is concentric and coaxial with the positive center of the waveguide square rod 3; embed the sample support positioning platform kit 6 into the upper top plate 901; place the sample 13 on the sample support positioning platform kit 6.

[0075] The adjustable centering device 9 of the sample space is coarsely adjusted so that the laser emitted by the laser-assisted centering and positioning device 8 approaches the center marking area of ​​the four sides of the sample 13. The coarse adjustment method is as follows: rotate the z-positive fixed support 902 and z-negative fixed support 908 relative to the rotatable base 912, successively parallel to the X-axis and Y-axis, respectively. Figure 5 , Figure 6 As shown, Figure 5 and Figure 6 In the diagram, tilt adjustment bolts 913 are also provided at the four z-direction fixed supports 902, although they are not shown. When parallel to the X-axis, loosen the tilt adjustment bolts 913, adjust the upper top plate 901 until it is basically parallel to the lower bottom plate 911, then rotate the z-direction fixed supports 902 and z-direction fixed supports 908 to be parallel to the Y-axis, and adjust the upper top plate 901 until it is basically parallel to the lower bottom plate 911. When the laser emitted by the laser-assisted centering and positioning device 8 approaches the center marking area of ​​the four sides of the sample 13, tighten the tilt adjustment bolts 913, and adjust the z-direction fixed supports 902 and z-direction fixed supports 908 to the locked state. After this operation, it can be considered that the position of the sample 13 in the XOY plane is basically adjusted. The purpose of the coarse adjustment is to make the upper top plate 901 and the lower bottom plate 911 roughly parallel, so as to further improve the accuracy of the assembly sample 13. If the upper top plate 901 and the lower bottom plate 911 are not parallel, the four piston rods 904 will be limited and the effective adjustment stroke cannot be achieved. The coarse adjustment can increase the space for the four piston rods 904 to move up and down at the same time, prevent the fine adjustment from being difficult to succeed, and increase the accuracy of the fine adjustment.

[0076] Step 3: Fine-tune the adjustable centering device 9 of the sample space so that the laser emitted by the laser-assisted centering and positioning device 8 is located in the center marking area of ​​the four sides of the sample 13. Adjustment method: Adjust the air pump 11 of the piston rod to increase the atmospheric pressure, and at the same time extend the piston connecting rod 904. First, place a level ruler parallel to the X-axis on the plane of the upper plate 901. (The function of the level ruler is: it has an air bubble inside that can determine the level of the plane. When the air bubble is located between the scale lines in the center of the bubble tube, it indicates that the surface is level. The side to which the air bubble deviates indicates that side is too high.) Adjust the extension length of each piston connecting rod 904 relative to the piston connecting rod tube 906 so that when the level ruler is in this direction, the air bubble is at the center scale line position. Then place the level ruler parallel to the Y-axis and repeat the above operation. When the laser is in the center area of ​​the four sides of the sample 13, and the bubble of the orthogonal measurement level is in the center scale line, the sample 13 can be considered to be in the center of the central frame 10. Use the support fixing pin 914 to fix the support position, and close the air inlet valve 909 and the air outlet valve 910.

[0077] Step 4: The sample 13 is clamped by the z-positive waveguide square rod 305 and the z-negative waveguide square rod 306, and the space of the sample is shortened by the adjustable centering device 9.

[0078] Z-direction first waveguide square rod spacer centering clamp 509 clamps the Z-direction waveguide square rod 305, Z-direction first waveguide square rod spacer centering clamp 509 clamps the Z-direction spacer 405, then Z-direction second waveguide square rod spacer centering clamp 510 and Z-direction first waveguide square rod spacer centering clamp 509 are attracted by magnets, Z-direction first waveguide square rod spacer centering clamp 509 and Z-direction first waveguide square rod spacer The centering clamp 509 clamps the z-positive waveguide square rod 305 and the z-positive gasket 405, and the z-positive waveguide square rod 305 and the z-positive gasket 405 are tightly fitted together. The edge of the z-positive gasket 405 is aligned with the front edge of the Z-positive first waveguide square rod gasket centering clamp 509 and the Z-positive second waveguide square rod gasket centering clamp 510, so that the z-positive gasket 405 and the z-positive waveguide square rod 305 are tightly fitted to the sample 13.

[0079] The z-negative waveguide rod 306 and the z-negative pad 406 have passed through the adjustable centering device 9 and the sample support positioning platform kit 6 to support the sample 13. In addition, the z-positive waveguide rod 305 and the z-negative waveguide rod 306 clamp the sample 13, thus fixing it in the z-axis direction.

[0080] Step 5: The adjustable centering device 9 and the sample support and positioning platform kit 6 shorten the sample space. The waveguide square rod shim centering clamp 5 clamps the shims 4 and waveguide square rod 3 in the four directions of x positive, x negative, y positive and y negative to fit the sample 13.

[0081] The operation is the same in the four directions: positive x, negative x, positive y, and negative y. Taking the positive x direction as an example, the first waveguide square rod spacer centering clamp 501 clamps the positive x waveguide square rod 301. Then, the first waveguide square rod spacer centering clamp 501 clamps the positive x spacer 401. Next, the second waveguide square rod spacer centering clamp 502 and the first waveguide square rod spacer centering clamp 501 are attracted by a magnet. The first waveguide square rod spacer centering clamp 501 and the second waveguide square rod spacer centering clamp 502 clamp the positive x waveguide square rod 301 and the positive x spacer 401, and the positive x waveguide square rod 301 and the positive x spacer 401 are held together. The edges of the positive x-axis shim 401 are aligned with the front edges of the positive x-axis waveguide rod shim centering clamp 501 and the positive x-axis waveguide rod shim centering clamp 502, so that the positive x-axis shim 401 and the positive x-axis waveguide rod 301 are tightly attached to the sample 13. In the same way, the shims and waveguide rods in the negative x-axis, positive y-axis, and negative y-axis directions are adjusted to be tightly attached to the sample 13. The presence of soft elastic material inside the waveguide rod shim centering clamp 5 makes the waveguide rod shim centering clamp 5 tightly clamp the shim 4 and the waveguide rod 3. At this time, the shims 4 and waveguide rods 3 in the five directions of positive x-axis, negative x-axis, positive y-axis, negative y-axis, and positive z-axis clamp the sample 13, thereby supporting the sample 13.

[0082] In the z-negative direction, the z-negative waveguide square rod 306 and the z-negative pad 406 are clamped by the z-negative first waveguide square rod pad centering clamp 511 and the z-negative second waveguide square rod pad centering clamp 512.

[0083] Step 6: After the sample is fixed, use the detachable three-dimensional alignment judgment device 12 to determine whether the position of the waveguide square rod 3 in each axis needs to be adjusted; if so... Figure 24A detachable three-dimensional alignment judgment device 12 is installed on the two waveguide square rod spacer alignment fixtures 5 adjacent to the x-axis and y-axis. The installation standard for the detachable three-dimensional alignment judgment device 12 is as follows: First, retract both detachable three-dimensional alignment judgment devices 12 to their shortest state and attach them to the symmetrical adsorption grooves 513 using fixed magnetic bases 1206. Simultaneously, adjust the worm gear knob 1208 to control the extension and retraction length of the movable worm gear 1203. When the two movable worm gears 1203 are simultaneously adjusted so that the square nuts 1201 of the two rods are in the same space and collinear, the rotatable bases 1207 of the two rods can be rotated respectively, and the worm gear knob 1208 can be finely adjusted so that the ends of the two movable worm gears 1203 contact and are then inserted into the two screw holes 1202 on the rotating shaft. The movable worm gear 1203 and the square nut 1201 can rotate relative to the rotating shaft. Observe and measure the included angle between the two detachable three-dimensional alignment judgment devices 12. If the included angle between the worm gear scales 1209 of adjacent axes is not 90°, the assembly process of the sample needs to be readjusted according to the degree to which it is greater than or less than 90°, and the position of each waveguide rod support 2 should be adjusted until the two axes are orthogonal. The method for adjusting the center position of the waveguide square rod 3 is as follows: The waveguide rod support 2 is equipped with adjustment knobs for adjusting the front and back and the height. The waveguide rod support 2 can support the end of the waveguide square rod 3 to be close to the surface of the sample 13. Adjust the height and horizontal position of the waveguide rod support 2 to control the spatial position of the center position of the waveguide square rod 3. When the ends of the six waveguide square rods 3 are in close contact with the corresponding surface of the sample 13, the waveguide square rod 3 can be considered to be adjusted. The orthogonal adjustment of the x-axis, y-axis, z-axis, z-axis and x-axis can be performed in sequence.

[0084] The above description, in conjunction with specific preferred embodiments, provides a further detailed explanation of the present invention. It should not be construed that the specific implementation of the present invention is limited to these descriptions. For those skilled in the art, various simple deductions or substitutions can be made without departing from the concept of the present invention, and all such modifications and substitutions should be considered within the scope of protection of the present invention.

Claims

1. A centering assembly sample device applied to a dynamic true triaxial electromagnetic Hopkinson bar, characterized in that: It includes waveguide square rod gasket centering clamp (5), sample support positioning platform kit (6), laser assisted centering positioning device (8), sample space adjustable centering device (9), detachable three-dimensional centering judgment device (12); the laser assisted centering positioning device (8) includes four laser emitters fixed on the center frame (10), the four laser emitters are located at the center of the four edges of the center frame (10) in the Z-axis direction, and the four laser emitters are coplanar; The sample space adjustable centering device (9) is arranged at the bottom center of the center frame (10); The sample support positioning platform kit (6) is arranged on the sample space adjustable centering device (9); The sample space adjustable centering device (9) includes an upper top plate (901), a z positive fixed support (902), a z positive support bolt (903), a piston connecting rod (904), a first sealing plug (905), a piston connecting rod tube (906), a z negative support bolt (907), a z negative fixed support (908), an air inlet valve (909), an air outlet valve (910), a lower bottom plate (911), a rotatable base (912), an inclination adjusting bolt (913), a support fixed bolt (914), an air pipe (7) and a piston air rod air inlet pump (11); the piston connecting rod (904), the piston connecting rod tube (906), the air inlet valve (909) and the air outlet valve (910) form a closed air chamber, and the air pipe (7) and the piston air rod air inlet pump (11) are connected to the air chamber; the rotatable base (912) is fixed at the center of each edge of the upper top plate (901) and the lower bottom plate (911), the z positive fixed support (902) and the z negative fixed support (908) are respectively attached to the upper top plate (901) and the lower bottom plate (911) through the respective rotatable bases (912), and the support fixed bolt (914) is used for fixing; The upper top plate (901) and the lower bottom plate (911) have a center square hole, the size of the center square hole is consistent with the size of the sample support positioning platform kit (6), and the size of the center square hole is greater than the size of the waveguide square rod (3); The waveguide square rod gasket centering clamp (5) includes twelve half-enclosing clamp structures with the same size and recessed observation grooves, each half-enclosing clamp is provided with two symmetrical adsorption grooves (513), each symmetrical adsorption groove (513) is provided with a magnet, and the waveguide square rod gasket centering clamp (5) is provided with a gasket (4) at the position corresponding to six axes as a buffer between the waveguide square rod (3) and the sample.

2. The centering and assembling specimen device applied to the dynamic true triaxial electromagnetic Hopkinson bar according to claim 1, characterized in that: The sample support positioning platform kit (6) is embedded in the upper top plate (901), and the sample support positioning platform kit (6) is composed of two parts: a z-positive sample support positioning platform (601) and a z-negative sample support positioning platform (602); the z-negative sample support positioning platform (602) is located at the lower end and has a larger size than the z-positive sample support positioning platform (601), and the two platforms form a stepped shape inside, further centering the sample in the XOY plane, and the z-negative sample support positioning platform (602) is fixed on the center square hole position on the upper surface of the upper top plate (901) of the sample space adjustable centering device (9), and the z-positive sample support positioning platform (601) bears the sample inside the stepped platform and is attached to the sample, and the constraint of the stepped platform makes the sample in the center position on the XOY plane.

3. The centering and assembling specimen device applied to the dynamic true triaxial electromagnetic Hopkinson bar according to claim 1, characterized in that: For the single waveguide square rod gasket centering clamp (5), from the middle of the clamp to the edge position near the rod end, the clamp gradually decreases in size in the form of an inclined surface.

4. A method for testing and using a centering assembly sample device applied to a dynamic true triaxial electromagnetic hopkinson bar, the method being a position adjustment method and testing and using instructions for a waveguide square rod (3) with a square cross-section in size, characterized in that, It utilizes the centering assembly sample device for the dynamic true triaxial electromagnetic Hopkinson bar of any one of claims 1 to 3, after the dynamic true triaxial electromagnetic Hopkinson bar device is assembled, the following steps are performed: Step 1: mark the center area of the four edges of the cubic sample (13); mark the center area of the four edges of the cubic sample (13) parallel to the z-axis; Step 2: position and coarsely adjust the sample space adjustable centering device (9); the sample space adjustable centering device (9) is fixed on the center frame (10) Z-negative positive center, so that the square hole center of the sample space adjustable centering device (9) is concentric and coaxial with the waveguide square rod (3) center; embed the sample support positioning platform kit (6) in the sample space adjustable centering device (9); the sample (13) is arranged on the sample support positioning platform kit (6); coarsely adjust the sample space adjustable centering device (9) so that the laser emitted by the laser auxiliary centering positioning device (8) approaches the four edge center mark area of the sample (13); Step 3: finely adjust the sample space adjustable centering device (9) so that the laser emitted by the laser auxiliary centering positioning device (8) is located at the four edge center mark area of the sample (13); Step 4: shorten the sample space adjustable centering device (9) by clamping the sample (13) with the z-positive waveguide square rod (305) and the z-negative waveguide square rod (306); Step 5: shorten the sample space adjustable centering device (9) and the sample support positioning platform kit (6), and clamp the gaskets (4) and the waveguide square rod (3) in the x-positive, x-negative, y-positive and y-negative directions close to the sample (13) by the waveguide square rod gasket centering clamp (5); Step 6: after the sample is fixed, use the detachable three-dimensional centering judgment device (12) to judge whether the position of the waveguide square rod (3) in each axial direction needs to be adjusted; sequentially adjust the x-axis y-axis, y-axis z-axis, and z-axis x-axis.

5. The method of claim 4, wherein the method is used for testing the assembly of a specimen in a dynamic true triaxial electromagnetic Hopkinson bar. In step 2, the sample space adjustable centering device (9) is positioned and coarsely adjusted, and the coarse adjustment method is as follows: the z positive fixed support (902) and the z negative fixed support (908) are rotated relative to the rotatable base (912) in the direction parallel to the X axis and the Y axis, respectively; when parallel to the X axis, the inclination adjusting bolt (913) is loosened, the upper top plate (901) is adjusted to be substantially parallel to the lower bottom plate (911), then the z positive fixed support (902) and the z negative fixed support (908) are rotated to be parallel to the Y axis, and the upper top plate (901) is adjusted to be substantially parallel to the lower bottom plate (911); when the laser emitted by the laser-assisted centering positioning device (8) approaches the center mark area of the four edges of the sample (13), the inclination adjusting bolt (913) is tightened, and the z positive fixed support (902) and the z negative fixed support (908) are adjusted to the locked state, so that the sample (13) is substantially adjusted in the XOY plane.

6. The method of claim 4, wherein the method is used for testing and assembling a specimen in a dynamic true triaxial electromagnetic Hopkinson bar. The specific adjustment method of step 3 is as follows: the air pressure of the piston air rod air inlet pump (11) is increased, and the piston connecting rod (904) is elongated; first, a level is placed on the upper top plate (901) parallel to the X axis, and the extension length of each piston connecting rod (904) relative to the piston connecting rod tube (906) is adjusted so that the air bubble is at the central scale line position when the level is placed in this direction; then the level is placed parallel to the Y axis, and the above operation is repeated; when the laser is in the center area of the four edges of the sample (13), and the level bubbles of the orthogonal measurements are all at the central scale line position, it is considered that the sample (13) is in the center position of the center frame (10), the support fixing pin (914) is used to fix the support position, and the air inlet valve (909) and the air outlet valve (910) are closed.

7. The method of claim 4, wherein the method is used for testing and assembling a specimen in a dynamic true triaxial electromagnetic Hopkinson bar. The specific steps of step 4 are as follows: the z positive first waveguide square rod gasket centering clamp (509) clamps the z positive waveguide square rod (305), the z positive first waveguide square rod gasket centering clamp (509) clamps the z positive gasket (405), then the z positive second waveguide square rod gasket centering clamp (510) and the z positive first waveguide square rod gasket centering clamp (509) are magnetically attracted, the z positive first waveguide square rod gasket centering clamp (509) and the z positive first waveguide square rod gasket centering clamp (509) clamp the z positive waveguide square rod (305) and the z positive gasket (405), and the z positive waveguide square rod (305) and the z positive gasket (405) are tightly attached, the edge of the z positive gasket (405) is aligned with the front edge of the z positive first waveguide square rod gasket centering clamp (509) and the z positive second waveguide square rod gasket centering clamp (510), so that the z positive gasket (405) and the z positive waveguide square rod (305) are tightly attached to the sample (13).

8. The method of claim 4, wherein the method is used for testing the assembly of a specimen in a dynamic true triaxial electromagnetic Hopkinson bar. The step 5 is specifically as follows: the operations of x positive direction, x negative direction, y positive direction and y negative direction are the same, and the x positive direction is taken as an example for description. The x positive direction first waveguide square rod gasket centering clamp (501) clamps the x positive direction waveguide square rod (301), then the x positive direction first waveguide square rod gasket centering clamp (501) clamps the x positive direction gasket (401), then the x positive direction second waveguide square rod gasket centering clamp (502) is attracted to the x positive direction first waveguide square rod gasket centering clamp (501) by a magnet, the x positive direction first waveguide square rod gasket centering clamp (501) and the x positive direction second waveguide square rod gasket centering clamp (502) clamp the x positive direction waveguide square rod (301) and the x positive direction gasket (401), and the x positive direction waveguide square rod (301) and the x positive direction gasket (401) are tightly attached, the edge of the x positive direction gasket (401) is aligned with the front end edge of the x positive direction first waveguide square rod gasket centering clamp (501) and the x positive direction second waveguide square rod gasket centering clamp (502), so that the x positive direction gasket (401) and the x positive direction waveguide square rod (301) are attached to the sample (13); in the same way, the gaskets and waveguide square rods of the x negative direction, the y positive direction and the y negative direction are adjusted to be attached to the sample (13); the existence of the soft elastic material in the waveguide square rod gasket centering clamp (5) makes the waveguide square rod gasket centering clamp (5) and the gasket (4) and the waveguide square rod (3) tightly clamped; at this time, the gaskets (4) and the waveguide square rods (3) of the x positive direction, the x negative direction, the y positive direction, the y negative direction and the z positive direction clamp and support the sample (13); the z negative direction first waveguide square rod gasket centering clamp (511) and the z negative direction second waveguide square rod gasket centering clamp (512) clamp the z negative direction waveguide square rod (306) and the z negative direction gasket (406) in the z negative direction.

9. The method of claim 4, wherein the method is used for testing the assembly of a specimen in a dynamic true triaxial electromagnetic Hopkinson bar. Step 6: The specific method is as follows: install the detachable three-dimensional centering judgment device (12) on the x-axis and y-axis adjacent two waveguide square rod gasket centering clamp (5), which includes an adjustable telescopic worm component with a magnetic base, wherein the fixed sleeve (1205) is fixed with the fixed magnetic base (1206), the inside of the telescopic part of the rod has a worm gear, the extension and contraction amount of the movable worm (1203) is controlled by the worm knob (1208), the square nut (1201) is provided with a screw hole (1202), the movable worm (1203) and the worm gear (1204) are fixed by the engagement of the gears, the worm knob (1208) drives the worm gear (1204) to further push the movement of the movable worm (1203); the rotatable seat (1207) rotates to twist the square nut (1201); for the detachable three-dimensional centering judgment device (12), the installation standard is as follows: first, shorten the two detachable three-dimensional centering judgment devices (12) to the shortest state, respectively adsorb in the symmetrical adsorption groove (513) by the fixed magnetic base (1206), and adjust the worm knob (1208) to control the telescopic length of the movable worm (1203), when the two movable worms (1203) are adjusted to the same space and collinear position of the square nut (1201) of the two rods at the same time, the rotatable seat (1207) of the two rods can be rotated respectively, the worm knob (1208) is adjusted, the two movable worms (1203) are contacted and sleeved into the rotating shaft into the two screw holes (1202), the movable worm (1203) and the square nut (1201) rotate relative to the rotating shaft, and the included angle between the two detachable three-dimensional centering judgment devices (12) is observed and measured, when the included angle of the adjacent shaft worm scale line (1209) is not 90°, the assembly sample process needs to be adjusted according to the degree of being greater than or less than 90°, and the position of each waveguide rod support support (2) is adjusted until the two shafts are orthogonal.

10. The method of claim 9, wherein the method is used for testing a specimen assembly device for centering in a dynamic true triaxial electromagnetic Hopkinson bar. The method for adjusting the center position of the waveguide square rod (3) is as follows: the waveguide rod support support (2) is provided with adjusting knobs for adjusting the front and back and the height, the waveguide rod support support (2) supports the rod end of the waveguide square rod (3) close to the surface position of the sample (13), the height and horizontal position of the waveguide rod support support (2) is adjusted, so as to control the spatial position of the center position of the waveguide square rod (3), when the rod end of the six waveguide square rods (3) is in close contact with the corresponding surface of the sample (13), it can be considered that the waveguide square rod (3) is adjusted.

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