High-voltage electric pulse fracturing device capable of being used in CT (Computed Tomography)

Abstract

The utility model discloses a high-voltage electric pulse fracturing device capable of being used in CT (Computed Tomography). The high-voltage electric pulse fracturing device comprises a clamp holder, wherein a sample cavity is formed in the center of the clamp holder; an upper electrode insulating rod and a lower electrode insulating rod are coaxially arranged at the upper end and the lower end of the sample cavity respectively, an upper electrode rod is arranged in the upper electrode insulating rod in a penetrating mode, the bottom face of the upper electrode rod abuts against the top face of the sample cavity, the upper portion of the upper electrode rod is connected with an upper electrode clamping block, and the upper electrode clamping block is connected with the positive electrode of a high-voltage electric pulse generator; a lower electrode rod is arranged in the lower electrode insulating rod in a penetrating manner, the top surface of the lower electrode rod is propped against the bottom surface of the sample cavity, the lower part of the lower electrode rod is connected with a lower electrode clamping block, and the lower electrode clamping block is connected with a negative electrode of the high-voltage electric pulse generator; a detachable insulating oil barrel is mounted at the top of the clamp holder; the upper electrode clamping block and the upper electrode rod positioned above the upper electrode clamping block can be immersed in insulating oil in the insulating oil barrel; and the metal parts on the clamp holder are connected with the negative electrode of the high-voltage electric pulse generator through copper strips.

Description

Technical Field

[0001] The utility model relates to a high-voltage electric pulse cracking device that can be used inside a CT, belonging to the technical field of test equipment. Background Art

[0002] High-voltage electric pulse cracking refers to using the shock wave generated during the discharge process and the mechanical effects caused by the high temperature generated in the plasma channel to electrically breakdown solid materials, and triggering a series of physical and chemical changes to form cracks, resulting in the breakdown and cracking effect. It can be used in research experiments on the high-voltage electric pulse cracking mechanism and cracking influence of solid materials including rocks, coal, frozen soil, plastic doping, composite materials, etc. Currently, it is mainly used in research experiments on the enhanced permeability mechanism of high-voltage electric pulse cracking of coal seams and the enhanced permeability effect of high-voltage electric pulse cracking of coal seam gas.

[0003] A Chinese invention patent with the application number CN202111462787.X discloses a specimen holder for coal seam cracking, which includes a pressure chamber in the shape of a circular tube structure. The inner cavity of the pressure chamber is used to install a specimen at the central position; both the upper and lower ends of the specimen are equipped with electrode needles and gas and liquid conducting conductive bolts. One end of the electrode needle abuts against the specimen, and the other end sequentially passes through the first slide bar, the second slide bar, and the third slide bar coaxially and then inserts into the blind hole of the fourth slide bar. One end of the gas and liquid conducting conductive bolt is connected to the electrode needle, and the other end laterally penetrates outside the fourth slide bar. The diameter of the electrode needle is smaller than the inner diameter of the slide bar it passes through to form a water and gas channel, and both water and gas channels are close to the specimen. The gas and liquid conducting conductive bolt is a hollow rod structure, and the inner end of the gas and liquid conducting conductive bolt located above is connected to the water and gas channel, and the outer end is a water and gas outlet. The inner end of the gas and liquid conducting conductive bolt located below is connected to the water and gas channel, and the outer end is respectively provided with an air inlet and a water inlet. The pressure chamber is rotatably installed on an insulating fixed base in a 360° horizontal rotation manner, and the pressure chamber is made of materials that meet the requirements of CT scanning. Although the specimen holder described in this patent can be used to a certain extent in research experiments on high-voltage electric pulse cracking of coal seams, the inventor of this application found in the experiment that when using the described specimen holder for high-voltage electric pulse cracking experiments, there is a creepage problem at the high-voltage discharge end. High-voltage electric pulse discharge uses a high-voltage electric pulse generator to pre-charge first, then discharge instantaneously, and then form a plasma explosion in the sample to open the sample cracks. If the creepage problem is not handled, it will cause the high-voltage electric pulse generator to not be able to charge, or there will be continuous arcing with adjacent components, posing a safety risk of breakdown of the metal or air near the electrode; in addition, there is only one grounding for the above specimen holder, which cannot ensure that the entire holder is in an equipotential state, and there will be arcing problems in other places, such as threads, which will cause the threads to melt at the discharge location and cannot be disassembled. If arcing occurs at other parts of the holder, it will also cause other safety hazards. Summary of the Utility Model

[0004] In view of the above problems existing in the prior art, the purpose of the utility model is to provide a high-voltage electric pulse fission device that can be used in CT to improve the safety of use and service life.

[0005] In order to achieve the above purpose, the technical solution adopted by the utility model is as follows:

[0006] A high-voltage electric pulse fission device that can be used in a CT comprises a clamp, a sample cavity is provided at the center of the clamp, an upper electrode insulating rod and a lower electrode insulating rod are coaxially provided at the upper and lower ends of the sample cavity, an upper electrode rod is inserted into the upper electrode insulating rod, the bottom surface of the upper electrode rod abuts against the top surface of the sample cavity, an upper electrode clamp is connected to the upper part of the upper electrode rod, and the upper electrode clamp is connected to the positive electrode of a high-voltage electric pulse generator; a lower electrode rod is inserted into the lower electrode insulating rod, the top surface of the lower electrode rod abuts against the bottom surface of the sample cavity, a lower electrode clamp is connected to the lower part of the lower electrode rod, and the lower electrode clamp is connected to the negative electrode of the high-voltage electric pulse generator; and a detachable insulating oil barrel is installed on the top of the clamp, the upper electrode clamp and the upper electrode rod located above the upper electrode clamp can be immersed in the insulating oil in the insulating oil barrel; the metal parts on the clamp are connected to the negative electrode of the high-voltage electric pulse generator through copper strips.

[0007] In one implementation scheme, the clamp includes a cylinder, with an uploading force transmission end and a downloading force transmission end respectively provided at both ends of the cylinder, a clamping nut is embedded in the top end of the uploading force transmission end, and a sealing pressure head is embedded in the bottom end of the downloading force transmission end, the upper portion of the upper electrode insulating rod is inserted into the clamping nut, and the lower portion of the lower electrode insulating rod is inserted into the sealing pressure head.

[0008] A preferred solution is that at least one group of centrally symmetrical cantilevers are provided on the outer periphery of the upper force transmission end and the outer periphery of the lower force transmission end, and the upper cantilever located on the upper force transmission end forms a mirror symmetry with the lower cantilever located on the lower force transmission end, and an axial pressure-bearing carbon fiber sleeve parallel to the axial direction is wound around the upper and lower cantilevers forming the mirror symmetry.

[0009] In a further preferred embodiment, a circumferential pressure-bearing carbon fiber sleeve is wound circumferentially around the outer wall of the cylinder.

[0010] In one implementation scheme, the lower portion of the clamp is connected to an axial loading cylinder via a double threaded flange, the top surface of the piston rod in the axial loading cylinder abuts against the bottom surface of the sealing pressure head, and the lower portion of the lower electrode rod passes through the sealing pressure head and is inserted into the piston rod.

[0011] An implementation, the uploading force end head, the downlink force end head, the compression nut, the double-threaded flange and the piston rod are all made of metal materials, and are respectively connected to the negative electrode of the high-voltage electric pulse generator through copper strips.

[0012] An implementation, a groove is provided at the center of the top of the sealing plug, and a boss adapted to the groove is provided at the center of the bottom of the lower electrode insulating rod. The lower electrode insulating rod is connected to the sealing plug through the insertion connection of the boss and the groove.

[0013] An implementation, the upper electrode insulating rod is divided into a lower circular rod, a middle circular rod and an upper circular rod, where: the outer diameter of the lower circular rod is adapted to the inner diameter of the sample cavity, the outer diameter of the middle circular rod is adapted to the inner diameter of the cylinder body, and the outer diameter of the upper circular rod is adapted to the aperture of the compression nut.

[0014] A further implementation, the upper circular rod of the upper electrode insulating rod passes through the top of the compression nut, and an insulating oil barrel fixing seat is hermetically sleeved on the upper circular rod above the compression nut, and the insulating oil barrel is hermetically sleeved on the insulating oil barrel fixing seat.

[0015] A preferred solution, a sealing ring is provided on the contact surface between the upper circular rod and the insulating oil barrel fixing seat.

[0016] An implementation, the bottom of the insulating oil barrel fixing seat is provided with a protruding edge for limiting the insulating oil barrel.

[0017] A preferred solution, a sealing ring is provided on the contact surface between the insulating oil barrel and the insulating oil barrel fixing seat.

[0018] An implementation, the upper electrode clamp block is firmly connected to the upper electrode rod, and a positive connection copper strip for connecting to the positive electrode of the high-voltage electric pulse generator is also fixed on the upper electrode clamp block.

[0019] An implementation, the lower electrode clamp block is coaxially arranged with the lower electrode rod.

[0020] An implementation, the upper electrode rod and the lower electrode rod are both hollow rods made of conductive materials, and a displacement fluid outflow pipe joint is provided at the top of the upper electrode rod, and a displacement fluid inflow pipe joint is provided at the bottom of the lower electrode rod.

[0021] A preferred solution, the cylinder body is made of a material that can be penetrated by CT rays.

[0022] Compared with the prior art, the beneficial technical effects of the present utility model are as follows:

[0023] In this application, by creatively arranging an insulating oil barrel at the top of the gripper, the upper electrode clamping block and the upper electrode rod located above the upper electrode clamping block are both immersed in the insulating oil in the insulating oil barrel, and the metal components on the gripper are all connected to the negative electrode of the high-voltage electric pulse generator through copper strips. This enables the high-voltage electric pulse fracturing device not only to avoid the safety risks caused by creepage problems, but also to keep the entire gripper in an equipotential state, effectively avoiding the risk of partial breakdown of the gripper. It has very high safety, a simple and compact structure, a small occupied volume, and can be used for in-situ loading / filtration combined with electric pulse tests inside a CT, having significant practical value and progressiveness. Brief Description of the Drawings

[0024] Figure 1 Fig. is a schematic three-dimensional structure diagram of a high-voltage electric pulse fracturing device that can be used inside a CT provided by the embodiment;

[0025] Figure 2 Fig. is a sectional structure diagram of a high-voltage electric pulse fracturing device that can be used inside a CT provided by the embodiment;

[0026] Figure 3 Fig. is after removing Figure 1 the structure schematic diagram after removing the insulating oil barrel and the insulating oil barrel fixing seat in;

[0027] Figure 4 Fig. is a schematic diagram showing the copper strip installation structure on the lower electrode clamping block;

[0028] Figure 5 Fig. is a schematic diagram showing the copper strip installation structure on the lower electrode clamping block and the piston rod;

[0029] Figure 6 Fig. is a partial structure schematic diagram showing the assembly relationship between the insulating oil barrel, the insulating oil barrel fixing seat, the upper electrode insulating rod, and the upper electrode clamping block;

[0030] Figure 7 Fig. is a partial structure schematic diagram showing the assembly relationship between the upper electrode clamping block and the upper electrode rod;

[0031] Figure 8 Fig. is a schematic diagram showing the bottom structure of the insulating oil barrel fixing seat;

[0032] Figure 9 Fig. is a partial structure schematic diagram showing the assembly relationship between the lower electrode clamping block, the lower electrode rod, and the copper strip;

[0033] The reference numerals in the figures are indicated as follows:

[0034] 1. Clamp; 1-1. Specimen cavity; 1-2. Cylinder body; 1-3. Upper force transmission end; 1-4. Lower force transmission end; 1-5. Compression nut; 1-6. Sealing press head; 1-61. Groove; 1-7. Cantilever; 1-7a. Upper cantilever; 1-7b. Lower cantilever; 1-8. Axial pressure-bearing carbon fiber sleeve; 1-9. Circumferential pressure-bearing carbon fiber sleeve; 2. Upper electrode insulating rod; 2-1. Lower circular rod; 2-2. Middle circular rod; 2-3. Upper circular rod; 3. Lower electrode insulating rod; 3-1. Boss; 4. Upper electrode rod; 4-1. Displacement fluid outflow pipe joint; 5. Upper electrode clamping block; 6. Lower electrode rod; 6-1. Displacement fluid inflow pipe joint; 7. Lower electrode clamping block; 8. Insulating oil barrel; 9. Copper strip; 9-1. First copper strip; 9-2. Second copper strip; 9-3. Third copper strip; 9-4. Fourth copper strip; 9-5. Fifth copper strip; 9-6. Sixth copper strip; 9-7. Seventh copper strip; 9-8. Eighth copper strip; 9-9. Ninth copper strip; 10. Double-threaded flange; 11. Axial loading cylinder; 12. Piston rod; 12-1. Lead-out hole; 13. Insulating oil barrel fixing seat; 13-1. Protruding edge; 13-2. Copper strip lead-out groove; 14. First sealing ring; 15. Second sealing ring; 16. Positive electrode connecting copper strip. Detailed implementation mode

[0035] The technical solutions of the present utility model will be further described in detail below in conjunction with the drawings and embodiments. In addition, it should be noted that the terms used in the present utility model are only for the purpose of describing specific embodiments, and are not intended to limit the present utility model. Unless otherwise defined, the technical terms or scientific terms used in the present utility model should be the ordinary meanings understood by those with ordinary skills in the art. The orientation or positional relationships indicated by the terms "inner", "outer", "upper", "lower", "top", "bottom", "front", "rear", "left", "right", "vertical", "horizontal", etc. are all based on the orientation or positional relationships shown in the drawings, and are only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation to the present utility model. In addition, the terms "set", "installed", "connected", "connected", "fixed", etc. should be understood in a broad sense. For example, it can be a fixed connection or a detachable connection; it can be a direct connection or an indirect connection. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0036] Embodiment

[0037] Please refer to Figures 1 to 9As shown in the figure, a high-voltage electric pulse fracturing device that can be used inside a CT includes a clamp 1. A specimen chamber 1-1 is provided at the center of the clamp 1. An upper electrode insulating rod 2 is coaxially provided at the upper end of the specimen chamber 1-1, and a lower electrode insulating rod 3 is coaxially provided at the lower end of the specimen chamber 1-1. An upper electrode rod 4 is inserted into the upper electrode insulating rod 2. The bottom surface of the upper electrode rod 4 abuts against the top surface of the specimen chamber 1-1. An upper electrode clamping block 5 is connected to the upper part of the upper electrode rod 4. The upper electrode clamping block 5 is connected to the positive electrode (not shown in the figure) of the high-voltage electric pulse generator; A lower electrode rod 6 is inserted into the lower electrode insulating rod 3. The top surface of the lower electrode rod 6 abuts against the bottom surface of the specimen chamber 1-1. A lower electrode clamping block 7 is connected to the lower part of the lower electrode rod 6. The lower electrode clamping block 7 is connected to the negative electrode (not shown in the figure) of the high-voltage electric pulse generator; And a detachable insulating oil barrel 8 is installed at the top of the clamp 1. The upper electrode clamping block 5 and the upper electrode rod 4 above the upper electrode clamping block 5 are both immersed in the insulating oil (not shown in the figure) in the insulating oil barrel 8; The metal components on the clamp 1 are all connected to the negative electrode (not shown in the figure) of the high-voltage electric pulse generator through a copper strip 9.

[0038] When performing a high-voltage electric pulse fracturing test, it is necessary to add insulating oil to the insulating oil barrel 8 so that the upper electrode clamping block 5 and the upper electrode rod 4 above the upper electrode clamping block 5 are both immersed in the insulating oil in the insulating oil barrel 8, and it is necessary to make the metal components on the clamp 1 all connected to the negative electrode of the high-voltage electric pulse generator through the copper strip 9. The high-voltage electric pulse fracturing test is carried out outside the CT machine. After the high-voltage electric pulse fracturing test is completed, it is necessary to first remove the insulating oil in the insulating oil barrel 8, then remove the insulating oil barrel 8, and then put the remaining device into the CT machine to scan and test the specimen after high-voltage electric pulse fracturing.

[0039] Please refer to Figure 2 As shown in the figure, in this embodiment, the clamp 1 includes a cylinder body 1-2. An upper force transmission end 1-3 and a lower force transmission end 1-4 are respectively provided at both ends of the cylinder body 1-2. A compression nut 1-5 is embedded at the top of the upper force transmission end 1-3, and a sealing head 1-6 is embedded at the bottom of the lower force transmission end 1-4. The upper part of the upper electrode insulating rod 2 is inserted into the compression nut 1-5, and the lower part of the lower electrode insulating rod 3 is inserted into the sealing head 1-6; The lower part of the clamp 1 is connected to an axial loading cylinder 11 through a double-threaded flange 10. The top surface of the piston rod 12 located inside the axial loading cylinder 11 abuts against the bottom surface of the sealing head 1-6. The lower part of the lower electrode rod 6 passes through the sealing head 1-6 and is inserted into the piston rod 12.

[0040] Please refer to Figure 1 、 Figure 3 、 Figure 4 、 Figure 5 、Figure 8 and Figure 9 As shown, in this embodiment, the uploading force end 1-3, the downloading force end 1-4, the compression nut 1-5, the double-threaded flange 10 and the piston rod 12 are all made of metal, and are respectively connected to the negative electrode (not shown in the figure) of the high-voltage electric pulse generator through the copper strip 9. The specific implementation of this embodiment is as follows: fix the first copper strip 9-1 at the top of the compression nut 1-5, fix the second copper strip 9-2 around the uploading force end 1-3, and connect the other end of the first copper strip 9-1 to the second copper strip 9-2 in parallel. Fix the third copper strip 9-3 around the downloading force end 1-4, and connect the second copper strip 9-2 and the third copper strip 9-3 through the fourth copper strip 9-4. Fix the fifth copper strip 9-5 at the top of the double-threaded flange 10, and connect the third copper strip 9-3 and the fifth copper strip 9-5 through the sixth copper strip 9-6. Fix the seventh copper strip 9-7 on the side of the piston rod 12, fix the eighth copper strip 9-8 on the lower electrode clamp block 7, and open an outlet hole 12-1 for the eighth copper strip 9-8 on the piston rod 12. The other end of the eighth copper strip 9-8 is led out from the outlet hole 12-1 and connected to the seventh copper strip 9-7 in parallel. The seventh copper strip 9-7 is led out from the hole in the double-threaded flange 10 and connected to the fifth copper strip 9-5 in parallel and then connected to the ninth copper strip 9-9, and then connected to the negative electrode (not shown in the figure) of the high-voltage electric pulse generator through the ninth copper strip 9-9. By connecting the above metal components to the negative electrode of the high-voltage electric pulse generator through the copper strip 9, the entire gripper 1 is in an equipotential state, effectively avoiding the risk of partial breakdown of the gripper 1, which not only has very high safety, but also has a simple and compact structure.

[0041] Please refer to again Figure 2 As shown, in this embodiment, a groove 1-61 is provided at the center of the top of the sealing press head 1-6, and a boss 3-1 adapted to the groove 1-61 is provided at the center of the bottom of the lower electrode insulating rod 3. The lower electrode insulating rod 3 is connected to the sealing press head 1-6 through the insertion connection of the boss 3-1 and the groove 1-61.

[0042] Please refer to again Figure 2As shown, in this embodiment, the upper electrode insulating rod 2 is divided into a lower circular rod 2-1, a middle circular rod 2-2, and an upper circular rod 2-3, where: the outer diameter of the lower circular rod 2-1 is adapted to the inner diameter of the sample cavity 1-1, the outer diameter of the middle circular rod 2-2 is adapted to the inner diameter of the cylinder 1-2, and the outer diameter of the upper circular rod 2-3 is adapted to the aperture of the compression nut 1-5; the upper circular rod 2-3 of the upper electrode insulating rod 2 passes through the top of the compression nut 1-5, and an insulating oil barrel fixing seat 13 is hermetically sleeved on the upper circular rod 2-3 above the compression nut 1-5, and the insulating oil barrel 8 is hermetically sleeved on the insulating oil barrel fixing seat 13. The specific implementation of this embodiment is: a first sealing ring 14 is provided on the contact surface between the upper circular rod 2-3 and the insulating oil barrel fixing seat 13, a second sealing ring 15 is provided on the contact surface between the insulating oil barrel 8 and the insulating oil barrel fixing seat 13, and a protruding edge 13-1 for limiting the insulating oil barrel 8 (please refer to Figure 6 shown) and a copper strip lead-out groove 13-2 for leading out the first copper strip 9-1 (please refer to Figure 8 shown) are provided at the bottom of the insulating oil barrel fixing seat 13.

[0043] In addition, please refer to Figure 2 、 Figure 3 、 Figure 6 and Figure 7 shown. In this embodiment, the upper electrode clamping block 5 is fixedly connected to the upper electrode rod 4, and a positive electrode connecting copper strip 16 for connecting to the positive electrode (not shown in the figure) of the high-voltage electric pulse generator is also fixedly provided on the upper electrode clamping block 5.

[0044] Please refer to Figure 4 and Figure 9 shown. In this embodiment, the lower electrode clamping block 7 is coaxially arranged with the lower electrode rod 6.

[0045] Please refer to Figure 2 、 Figure 7 and Figure 9 shown. In this embodiment, both the upper electrode rod 4 and the lower electrode rod 6 are hollow rods made of conductive materials. A displacement liquid outflow pipe joint 4-1 is provided at the top of the upper electrode rod 4, and a displacement liquid inflow pipe joint 6-1 is provided at the bottom of the lower electrode rod 6, so that the upper electrode rod 4 and the lower electrode rod 6 can simultaneously serve as displacement liquid circulation pipelines.

[0046] In addition, please refer to Figure 1As shown, in this embodiment, at least one set of cantilevers 1-7 that are centrosymmetric are provided on the outer periphery of the upward force end head 1-3 and the outer periphery of the downward force end head 1-4. Moreover, the upper cantilever 1-7a located on the upward force end head 1-3 and the lower cantilever 1-7b located on the downward force end head 1-4 form mirror symmetry. An axially pressure-bearing carbon fiber sleeve 1-8 parallel to the axis is wound on the upper and lower cantilevers that constitute mirror symmetry. Additionally, a circumferentially pressure-bearing carbon fiber sleeve 1-9 is wound circumferentially on the outer wall of the cylinder body 1-2. Through the provided axially pressure-bearing carbon fiber sleeve 1-8 and circumferentially pressure-bearing carbon fiber sleeve 1-9, the gripper 1 can simultaneously bear high confining pressure and high axial load, and has the characteristics of light weight and high stiffness, and can meet the high-condition use requirements in special occasions such as CT scanners and nuclear magnetic resonance instruments. For the specific principle, please refer to the Chinese invention patent with the patent number 201910535396.2 applied by the applicant on June 18, 2019. In addition, the cylinder body 1-2 in this application is made of a material that can be penetrated by CT rays.

[0047] Finally, it is necessary to point out here that the above description is only the preferred specific implementation manner of the present utility model, but the protection scope of the present utility model is not limited thereto. Any changes or substitutions that can be easily thought of by those skilled in the art within the technical scope disclosed by the present utility model should be covered within the protection scope of the present utility model.

Claims

1. A high-voltage electric pulse fracturing device that can be used inside a CT, including a holder, and a specimen cavity is provided in the center of the holder; characterized in that: An upper electrode insulating rod and a lower electrode insulating rod are coaxially arranged at the upper and lower ends of the specimen cavity respectively. An upper electrode rod is inserted into the upper electrode insulating rod. The bottom surface of the upper electrode rod abuts against the top surface of the specimen cavity. An upper electrode clamping block is connected to the upper part of the upper electrode rod. The upper electrode clamping block is connected to the positive electrode of the high-voltage electric pulse generator. A lower electrode rod is inserted into the lower electrode insulating rod. The top surface of the lower electrode rod abuts against the bottom surface of the specimen cavity. A lower electrode clamping block is connected to the lower part of the lower electrode rod. The lower electrode clamping block is connected to the negative electrode of the high-voltage electric pulse generator. Moreover, a detachable insulating oil barrel is installed at the top of the gripper. The upper electrode clamping block and the upper electrode rod above the upper electrode clamping block can be immersed in the insulating oil in the insulating oil barrel. The metal components on the gripper are all connected to the negative electrode of the high-voltage electric pulse generator through copper strips.

2. The high-voltage electric pulse fracturing device applicable to inside a CT according to claim 1, wherein: The gripper includes a cylinder body. An upper force transmission end head and a lower force transmission end head are respectively arranged at both ends of the cylinder body. A compression nut is embedded at the top end of the upper force transmission end head. A sealing press head is embedded at the bottom end of the lower force transmission end head. The upper part of the upper electrode insulating rod is inserted into the compression nut. The lower part of the lower electrode insulating rod is inserted into the sealing press head.

3. The high-voltage electric pulse fracturing device applicable to CT according to claim 2, characterized in that: At least one set of cantilevers that are centrosymmetric are arranged on the outer peripheral parts of the upper force transmission end head and the lower force transmission end head respectively. The cantilevers on the upper force transmission end head and the cantilevers on the lower force transmission end head form mirror symmetry. An axially compressive carbon fiber sleeve parallel to the axis is wound on the upper and lower cantilevers that form mirror symmetry. A circumferentially compressive carbon fiber sleeve is wound around the outer wall of the cylinder body in the circumferential direction.

4. The high-voltage electric pulse fracturing device applicable to CT according to claim 2, characterized in that: The lower part of the gripper is connected to an axial loading cylinder through a double-threaded flange. The top surface of the piston rod located in the axial loading cylinder abuts against the bottom surface of the sealing press head. The lower part of the lower electrode rod passes through the sealing press head and is inserted into the piston rod.

5. The high-voltage electric pulse fracturing device applicable to the CT according to claim 4, characterized in that: The upper force transmission end head, the lower force transmission end head, the compression nut, the double-threaded flange and the piston rod are all made of metal materials and are respectively connected to the negative electrode of the high-voltage electric pulse generator through copper strips.

6. The high-voltage electric pulse fracturing device applicable to CT according to claim 2, wherein: The upper electrode insulating rod is divided into a lower circular rod, a middle circular rod and an upper circular rod. Among them: the outer diameter of the lower circular rod is adapted to the inner diameter of the specimen cavity, the outer diameter of the middle circular rod is adapted to the inner diameter of the cylinder body, and the outer diameter of the upper circular rod is adapted to the hole diameter of the compression nut.

7. The high-voltage electric pulse fracturing device applicable to CT according to claim 6, wherein: The upper circular rod of the upper electrode insulating rod passes through the top of the compression nut. An insulating oil barrel fixing seat is hermetically sleeved on the upper circular rod above the compression nut. The insulating oil barrel is hermetically sleeved on the insulating oil barrel fixing seat.

8. The high-voltage electric pulse fracturing device applicable to CT according to claim 1, wherein: The upper electrode clamping block is fixedly connected to the upper electrode rod. A positive electrode connecting copper strip for connecting to the positive electrode of the high-voltage electric pulse generator is also fixedly arranged on the upper electrode clamping block.

9. The high-voltage electric pulse fracturing device applicable to CT according to claim 1, characterized in that: The lower electrode clamping block is coaxially arranged with the lower electrode rod.

10. The high-voltage electric pulse fracturing device applicable to inside a CT according to claim 1, characterized in that: Both the upper electrode rod and the lower electrode rod are hollow rods made of conductive materials. A displacement liquid outflow pipe joint is arranged at the top end of the upper electrode rod, and a displacement liquid inflow pipe joint is arranged at the bottom end of the lower electrode rod.

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