Zero magnetic space shielding device for coal rock fracture magnetic field monitoring experiment

Abstract

The invention provides a zero magnetic space shielding device for a coal rock fracture magnetic field monitoring experiment, and belongs to the technical field of coal rock fracture monitoring. Comprising an upper shielding assembly and a supporting assembly, a stress conduction assembly is arranged in the upper shielding assembly, a mounting assembly is arranged at the bottom of the stress conduction assembly, a lower shielding assembly is arranged at the bottom of the mounting assembly, and the upper shielding assembly is arranged at the top of the lower shielding assembly; and the supporting assembly is connected with the stress conduction assembly and is used for assisting a worker to carry out a coal rock fracture test. Through the arrangement of the supporting assembly, under the cooperation of an internal spring piece, the axis of a coal rock sample placed by a worker can coincide with the axis of an upper conduction rod and the axis of a lower conduction rod, the measurement precision of the coal rock sample is guaranteed, the reliability of experimental data is improved, and the upper conduction rod and the supporting assembly can be fixed together; and the stability and the assembly efficiency when the shielding device is assembled by a worker are improved.

Description

Technical Field

[0001] The present invention relates to the technical field of coal and rock fracture monitoring, and particularly relates to a zero-magnetic-space shielding device for coal and rock fracture magnetic field monitoring experiments. Background Technique

[0002] During the coal and rock fracture process, various physical effects such as sound, electricity, heat, and magnetism will be generated. By monitoring the weak magnetic field signal during the coal and rock fracture process, the stability of the coal and rock mass can be effectively evaluated and early warning of coal and rock dynamic disasters can be carried out. The interference of external environmental magnetic fields such as the earth's magnetic field and electrical equipment will affect the accuracy of coal and rock fracture magnetic field monitoring, resulting in inaccurate and unreliable monitoring results of the magnetic field signal during the coal and rock fracture process. How to accurately and effectively monitor and extract the weak magnetic field signal generated during the coal and rock fracture process is the basis and prerequisite for using the magnetic field signal to monitor coal and rock fracture.

[0003] During the process of conducting coal and rock crushing experiments inside the zero-magnetic-space shielding device, it is necessary to place the coal and rock specimen inside the zero-magnetic-space shielding device and make the axis of the coal and rock specimen coincide with the axes of the upper conduction rod and the lower conduction rod of the zero-magnetic-space shielding device, so as to ensure uniform stress on the coal and rock specimen, improve the measurement accuracy of the coal and rock specimen and the reliability of the experimental data. However, during the assembly process of the zero-magnetic-space shielding device, the coal and rock specimen is easily affected by the external force generated during the installation of the components of the zero-magnetic-space shielding device, resulting in displacement of the coal and rock specimen and affecting the reliability of subsequent coal and rock fracture experiments. Therefore, the present invention provides a zero-magnetic-space shielding device for coal and rock fracture magnetic field monitoring experiments to meet the requirements. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to provide a zero-magnetic-space shielding device for coal and rock fracture magnetic field monitoring experiments. By setting a support component and cooperating with an internal spring piece, the axis of the coal and rock specimen placed by the staff can coincide with the axes of the upper conduction rod and the lower conduction rod, ensuring the measurement accuracy of the coal and rock specimen and improving the reliability of the experimental data. Moreover, the upper conduction rod can be fixed to the support component, improving the stability and assembly efficiency of the staff when assembling the shielding device. Through the above settings, the problem of inconvenient assembly of the space shielding device during the coal and rock fracture test can be solved.

[0005] To solve the above technical problems, the present invention provides the following technical solutions:

[0006] A zero-magnetic-space shielding device for coal and rock fracture magnetic field monitoring experiments, including an upper shielding component and a support component. A stress conduction component is arranged inside the upper shielding component. An installation component is arranged at the bottom of the stress conduction component. A lower shielding component is arranged at the bottom of the installation component. The upper shielding component is arranged on the top of the lower shielding component; the support component is connected to the stress conduction component and is used to assist the staff in conducting coal and rock fracture experiments.

[0007] Optionally, the upper shielding assembly is composed of multiple layers of Permalloy layers and multiple handles arranged at intervals, the multiple layers of Permalloy layers are fixedly connected to the handles by bolts, the tops of the multiple layers of Permalloy layers are each provided with a conduction port, and the outer side of one end of the multiple layers of Permalloy layers away from the handle is provided with a first lead port.

[0008] Optionally, the stress conduction assembly consists of an upper conduction rod and a lower conduction rod, a coal rock sample is arranged between the upper conduction rod and the lower conduction rod, and the upper conduction rod passes through the conduction port from bottom to top.

[0009] Optionally, the mounting assembly includes a ring arranged at the bottom of the lower conduction rod, the outer side of the ring is fixedly connected to a plurality of first slide rails by bolts, the interiors of the plurality of first slide rails are slidably connected to a second slide rail, the interiors of the plurality of second slide rails are slidably connected to a plurality of sliders, the interiors of the plurality of sliders are threadedly connected to screws, one end of the plurality of screws are fixedly connected to elastic clips, and sensors are clamped inside the plurality of elastic clips.

[0010] Optionally, the overall contour of the elastic clamp is a "匚"-shaped contour, and the two ends of the elastic clamp away from the screw are arc-shaped contours that are turned outward.

[0011] Optionally, the lower shielding assembly includes multiple layers of spaced-apart Permalloy bases, the top outer walls of the multiple layers of the Permalloy bases are each provided with a second lead-in opening, the interior of the lower conduction rod is threadedly connected with a threaded member, the threaded member sequentially passes through the multiple layers of the Permalloy bases and the ring from bottom to top, and the bottom of the threaded member is fixedly connected to the device base plate.

[0012] Optionally, the support assembly includes a first pressing plate sleeved on the top of the lower conduction rod, and a telescopic sleeve is fixedly connected to the bottom of the first pressing plate.

[0013] Optionally, one end of the telescopic sleeve away from the first pressure plate is fixedly connected to a first connecting piece, the telescopic sleeve and the first connecting piece are sleeved on the outer wall of the lower conduction rod, and the inner wall of the first connecting piece is consistent with the outer wall of the lower conduction rod.

[0014] Optionally, a connecting rod is fixedly connected to the top of the first connecting member, an end of the connecting rod away from the first connecting member is fixedly connected to a second connecting member, and the coal rock sample is arranged inside the second connecting member.

[0015] Optionally, a plurality of spring pieces are fixedly connected to the inner wall of the second connecting piece. A protrusion is provided at one end of each of the plurality of spring pieces. An upper pressing plate is inserted into the second connecting piece. A groove adapted to the protrusion is formed at the bottom of the upper pressing plate. A plurality of elastic retaining pieces are fixedly connected to the top of the upper pressing plate.

[0016] Compared with the prior art, the present invention has at least the following beneficial effects:

[0017] In the above solution, by providing the support assembly, with the cooperation of the internal spring pieces, the axis of the coal and rock sample placed by the staff can be made to coincide with the axes of the upper conduction rod and the lower conduction rod, ensuring the measurement accuracy of the coal and rock sample and improving the reliability of the experimental data. Moreover, the spring pieces cooperate with the upper pressing plate and the elastic retaining pieces to fix the upper conduction rod and the support assembly together, preventing the upper conduction rod from driving the coal and rock sample to displace or tip over when the staff installs the upper shielding assembly, affecting the rupture of the coal and rock sample, and improving the stability and assembly efficiency when the staff assembles the shielding device.

[0018] Furthermore, the present invention is provided with a slider, a screw, and an elastic clamping member, which facilitate the staff to adjust the height of the fixed sensor according to the experimental requirements, preventing the position of the sensor from changing during the rupture process of the coal and rock sample, affecting the monitoring of the weak magnetic field information generated during the rupture process of the coal and rock sample. Moreover, by setting the circular arc profiles of the outer flanges at both ends of the elastic clamping member, the success rate of the staff in clamping the sensor into the elastic clamping member can be improved, and the fixing efficiency of the sensor can be enhanced. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The drawings incorporated herein and constituting a part of the specification illustrate embodiments of the present invention and, together with the specification, are further used to explain the principles of the present invention and enable those skilled in the relevant art to implement and use the present invention.

[0020] Figure 1 It is a three-dimensional structural schematic diagram of a zero-magnetic space shielding device for coal and rock fracture magnetic field monitoring experiments;

[0021] Figure 2 It is a three-dimensional structural schematic diagram of the support assembly after deformation in cooperation with a sectional view;

[0022] Figure 3 It is a three-dimensional structural schematic diagram of the support assembly after deformation in cooperation with an enlarged view;

[0023] Figure 4 It is a three-dimensional structural schematic diagram of the support assembly before deformation in cooperation with a sectional view;

[0024] Figure 5 For Figure 4 The enlarged three-dimensional structural schematic diagram of part A of

[0025] Reference Signs:

[0026] 1. Upper shielding component; 101. Permalloy layer; 102. Handle; 103. Conduction port; 104. First lead port; 2. Stress conduction component; 201. Upper conduction rod; 202. Lower conduction rod; 203. Coal and rock sample; 3. Installation component; 301. Collar; 302. First slide rail; 303. Second slide rail; 304. Slide block; 305. Screw; 306. Elastic clamping part; 307. Sensor; 4. Lower shielding component; 401. Permalloy base; 402. Second lead port; 403. Device bottom plate; 404. Threaded part; 5. Support component; 501. First pressing plate; 502. Telescopic sleeve; 503. First connecting part; 504. Connecting rod; 505. Second connecting part; 506. Spring piece; 507. Upper pressing plate; 508. Elastic retaining piece.

[0027] As shown in the figure, in order to clearly implement the structure of the embodiments of the present invention, specific structures and devices are marked in the figure. However, this is only for illustrative purposes and is not intended to limit the present invention to this specific structure, device, and environment. Those of ordinary skill in the art can adjust or modify these devices and environments according to specific needs. Detailed Embodiments

[0028] The following describes in detail a zero-magnetic space shielding device for coal and rock fracture magnetic field monitoring experiments provided by the present invention with reference to the accompanying drawings and specific embodiments. At the same time, it should be noted here that in order to make the embodiments more detailed, the following embodiments are the best and preferred embodiments. For some well-known technologies, those skilled in the art can also adopt other alternative methods for implementation; moreover, the accompanying drawings are only for more specific description of the embodiments and are not intended to specifically limit the present invention.

[0029] It should be pointed out that in the specification, terms such as "an embodiment", "embodiments", "exemplary embodiments", "some embodiments", etc. indicate that the described embodiments may include specific features, structures, or characteristics, but not necessarily every embodiment includes such specific features, structures, or characteristics. Additionally, when combining embodiments to describe specific features, structures, or characteristics, implementing such features, structures, or characteristics in combination with other embodiments (whether explicitly described or not) should be within the knowledge of those skilled in the relevant art.

[0030] Generally, terms can be understood, at least in part, from their use in context. For example, depending at least in part on the context, the term "one or more" as used herein can be used to describe any feature, structure, or property in a singular sense, or can be used to describe a combination of features, structures, or properties in a plural sense. Additionally, the term "based on" can be understood to not necessarily be intended to convey a set of exclusive factors, but rather, depending at least in part on the context, can alternatively allow for the existence of other factors that are not necessarily explicitly described.

[0031] It can be understood that the meanings of "on", "above", and "over" in the present invention should be interpreted in the broadest manner such that "on" not only means "directly on" something, but also includes the meaning of being "on" something with intervening features or layers therebetween, and "above" or "over" not only means "above" or "over" something, but can also include the meaning of being "above" or "over" something with no intervening features or layers therebetween.

[0032] In addition, spatial relative terms such as "under", "below", "lower", "above", "upper", etc. can be used herein for convenience of description to describe the relationship of one element or feature to another or other elements or features, as shown in the drawings. The spatial relative terms are intended to cover different orientations in the use or operation of the device in addition to the orientation depicted in the drawings. The device can be oriented in other ways, and the spatial relative descriptive terms used herein can be correspondingly interpreted similarly.

[0033] As Figures 1 to 5 shown, an embodiment of the present invention provides a zero magnetic space shielding device for coal and rock fracture magnetic field monitoring experiments, including an upper shielding assembly 1 and a support assembly 5. A stress conduction assembly 2 is arranged inside the upper shielding assembly 1. An installation assembly 3 is arranged at the bottom of the stress conduction assembly 2. A lower shielding assembly 4 is arranged at the bottom of the installation assembly 3. The upper shielding assembly 1 is arranged on the top of the lower shielding assembly 4; the support assembly 5 is used to assist the staff in conducting coal and rock fracture tests. The support assembly 5 is connected to the stress conduction assembly 2. Through the arrangement of the support assembly 5, with the cooperation of the internal spring piece 506, the axis of the coal and rock specimen 203 placed by the staff can be made to coincide with the axes of the upper conduction rod 201 and the lower conduction rod 202, ensuring the measurement accuracy of the coal and rock specimen 203 and improving the reliability of the experimental data. Moreover, the spring piece 506, in cooperation with the upper pressing plate 507 and the elastic retaining piece 508, can fix the upper conduction rod 201 and the support assembly 5 together, preventing the upper conduction rod 201 from driving the coal and rock specimen 203 to displace or tilt when the staff installs the upper shielding assembly 1, affecting the fracture of the coal and rock specimen 203, and improving the stability and assembly efficiency when the staff assembles the shielding device.

[0034] In this embodiment, as Figure 3 and Figure 5 shown, the support assembly 5 includes a first pressing plate 501 sleeved on the top of the lower conduction rod 202. A telescopic sleeve 502 is fixedly connected to the bottom of the first pressing plate 501. One end of the telescopic sleeve 502 away from the first pressing plate 501 is fixedly connected to a first connecting member 503. The telescopic sleeve 502 and the first connecting member 503 are sleeved on the outer wall of the lower conduction rod 202. The inner wall of the first connecting member 503 fits with the outer wall of the lower conduction rod 202. A connecting rod 504 is fixedly connected to the top of the first connecting member 503. One end of the connecting rod 504 away from the first connecting member 503 is fixedly connected to a second connecting member 505. The coal and rock sample 203 is arranged inside the second connecting member 505. A plurality of spring pieces 506 are fixedly connected to the inner wall of the second connecting member 505. Protrusions are arranged at one ends of the plurality of spring pieces 506. An upper pressing plate 507 is inserted into the second connecting member 505. Grooves adapted to the protrusions of the spring pieces 506 are formed at the bottom of the upper pressing plate 507. A plurality of elastic retaining pieces 508 are fixedly connected to the top of the upper pressing plate 507. Through the arrangement of the elastic retaining pieces 508, when the elastic retaining pieces 508 are in the undeformed state, they can assist the upper conduction rod 201 to be inserted into the upper pressing plate 507, improving the success rate of inserting the upper conduction rod 201 into the upper pressing plate 507. When the elastic retaining pieces 508 are in the deformed state, the upper conduction rod 201 and the support assembly 5 are connected in a limiting manner.

[0035] When the staff needs to use the support component 5, first align and sleeve the support component 5 on the lower conduction rod 202 until it stops after the first pressing plate 501 fits against the top of the lower conduction rod 202. At this time, the staff can hold the support component 5 with one hand and insert the coal and rock sample 203 into the inside of the second connecting member 505 with the other hand and press open the spring piece 506 inside the second connecting member 505 until the coal and rock sample 203 coincides with the top of the first pressing plate 501 and then stops. At this time, the spring piece 506 will continuously reset due to its own elasticity and apply a thrust force to the coal and rock sample 203. Multiple spring pieces 506 apply a thrust force to the coal and rock sample 203, making the axis of the coal and rock sample 203 coincide with the lower conduction rod 202. Furthermore, coal and rock samples 203 with different diameters can be pushed by the spring pieces 506 through elasticity to coincide with the axis of the lower conduction rod 202. Then the staff can place the upper pressing plate 507 into the inside of the second connecting member 505, align and insert the upper conduction rod 201 into the inside of the upper pressing plate 507 until it stops after the upper conduction rod 201 pushes the upper pressing plate 507 to fit against the top of the coal and rock sample 203. Then, the hand of the staff holding the support component 5 can exert an upward force until the upper pressing plate 507 relatively squeezes the spring piece 506 to deform and fit against the inner wall of the second connecting member 505, and stops after the annular groove at the bottom of the upper pressing plate 507 coincides with the protrusion of the upper pressing plate 507 and is limited. At this time, the elastic retaining piece 508 at the top of the upper pressing plate 507 is relatively squeezed and deformed by the inner wall of the second connecting member 505, and the elastic retaining piece 508 is stuck on the pressing disc of the upper conduction rod 201, so that when the upper conduction rod 201 is inside the support component 5, it is connected to the support component 5, and the upper conduction rod 201 is fixed inside the support component 5 by the elastic force of the upper pressing plate 507 and can drive the support component 5 to move together, making the upper conduction rod 201 fixed vertically. This avoids the displacement of the upper conduction rod 201 due to contact with the conduction port 103 when the staff assembles the upper shielding component 1, which affects the subsequent fracture of the coal and rock sample 203.

[0036] In this embodiment, as Figures 1 to 4As shown in the figure, the upper shielding component 1 is composed of multiple layers of permalloy layers 101 arranged at intervals and multiple handles 102. The multiple layers of permalloy layers 101 are fixedly connected to the handles 102 by bolts. Through the arrangement of the handles 102, it is used to assist the staff in lifting and lowering the upper shielding component 1, facilitating the adjustment of the internal structure of the upper shielding component 1 and the placement of the coal and rock sample 203. Conduction ports 103 are opened at the tops of the multiple layers of permalloy layers 101, and first lead ports 104 are opened on the outer sides of one ends of the multiple layers of permalloy layers 101 away from the handles 102. The stress conduction component 2 is composed of an upper conduction rod 201 and a lower conduction rod 202. A coal and rock sample 203 is arranged between the upper conduction rod 201 and the lower conduction rod 202. The upper conduction rod 201 passes through the conduction ports 103 opened in the multiple layers of permalloy layers 101 from bottom to top. The lower shielding component 4 includes multiple layers of permalloy bases 401 arranged at intervals. Second lead ports 402 are opened on the outer walls of the tops of the multiple layers of permalloy bases 401. Through the opening of the first lead ports 104 and the second lead ports 402, the lines of the sensors 307 inside the shielding device can be routed to the outside. A threaded part 404 is connected to the inside of the lower conduction rod 202 by threads. The threaded part 404 passes through the multiple layers of permalloy bases 401 and the collar 301 from bottom to top in sequence. A device bottom plate 403 is fixedly connected to the bottom of the threaded part 404.

[0037] Specifically, the permalloy layer 101 has a cylindrical structure with an open bottom. The thickness of the permalloy layer 101 is 1 mm, the interval between adjacent two layers of permalloy layers 101 is 10 mm, and the inner diameter of the upper shielding component 1 is The height is 350 mm, the residual magnetism in the internal area of the upper shielding component 1 is better than 20 nT. The structure design of the permalloy shielding cylinder is reasonable, and the shielding effect is not affected during the operation of the press, ensuring that the shielding body does not deform; the permalloy base 401 has the same material as the permalloy layer 101 and is composed of multiple layers of permalloy arranged at intervals. The permalloy base 401 is made of three layers of permalloy with a thickness of 1 mm, each layer is spaced 10 mm apart, and the inner diameter size of each layer is the same as the outer diameter of the corresponding layer of the permalloy layer 101; the device bottom plate 403 has a load-bearing function, and the bearing stress is greater than 200 MPa.

[0038] In this embodiment, as Figures 4 to 5As shown in the figure, the installation component 3 includes a collar 301 arranged at the bottom of the lower conduction rod 202. A plurality of first sliding rails 302 are fixedly connected to the outer side of the collar 301 through bolts. A second sliding rail 303 is slidably connected inside each of the plurality of first sliding rails 302. A plurality of sliders 304 are slidably connected inside the plurality of second sliding rails 303. Screws 305 are threadedly connected inside each of the plurality of sliders 304. One end of each of the plurality of screws 305 is fixedly connected to an elastic clamping member 306. A sensor 307 is clamped inside the plurality of elastic clamping members 306. Through the arrangement of the sliders 304, the screws 305, and the elastic clamping members 306, when the staff needs to adjust the installation height of the sensor 307, the elastic clamping member 306 can be rotated, so that the elastic clamping member 306 drives the screw 305 to disengage from the inside of the slider 304 by a part. Furthermore, the elastic clamping member 306 and the second sliding rail 303 are no longer squeezed and fixed, allowing the slider 304 to slide up and down inside the second sliding rail 303 and drive the screw 305 and the elastic clamping member 306 to change positions. At this time, the height adjustment of the elastic clamping member 306 is completed, and the sensor 307 can be clamped into the inside of the elastic clamping member 306, achieving the effect of adjusting the height of the sensor 307 according to the experimental requirements. After the height adjustment of the sensor 307 is completed, the staff can rotate the elastic clamping member 306 in the reverse direction, so that the elastic clamping member 306 drives the screw 305 to re-enter the inside of the slider 304 through the thread, making the elastic clamping member 306 and the second sliding rail 303 clamp and fix again, avoiding the position of the sensor 307 changing during the cracking process of the coal and rock sample 203, which affects the monitoring of the weak magnetic field information generated during the cracking process of the coal and rock sample 203. The overall contour of the elastic clamping member 306 is a "C" - shaped contour, and the arc - shaped contour of the elastic clamping member 306 flips outward at both ends away from the screw 305. Through the setting of the arc - shaped contour of the elastic clamping member 306 that flips outward at both ends, the success rate of the staff clamping the sensor 307 into the inside of the elastic clamping member 306 can be improved, and the fixing efficiency of the sensor 307 can be increased.

[0039] As known from the previous text, the collar 301 is rotationally fixed between the outer wall of the threaded member 404, the lower conduction rod 202, and the permalloy base 401. This enables the staff to rotate the installation component 3 inside the shielding device by rotating the collar 301 on the outer wall of the threaded member 404 when installing the sensor 307. Furthermore, when the staff installs the sensor 307, instead of rotating around the shielding device according to the installation position of the sensor 307, the elastic clamping member 306 where the sensor 307 needs to be installed can be rotated in front of the staff for installation, improving the installation efficiency of the staff installing the sensor 307. And this installation method does not require drilling holes in the permalloy base 401, reducing the processing difficulty of the shielding device and improving the installation efficiency.

[0040] The working principle of the technical solution provided by the present invention is as follows: When the staff needs to conduct a coal and rock fracture experiment, first, set the lower shielding component 4 of the shielding device on the press, move the second slide rail 303 on the mounting component 3 to a position away from the collar 301 of the first slide rail 302, then adjust the position of the elastic clamping member 306 according to the experimental requirements and snap the required sensor 307 into the inside of the elastic clamping member 306, discharge the data cable of the sensor 307 to the outside through the second lead port 402, then set the support component 5 on the lower conduction rod 202, and sequentially set the coal and rock specimen 203 and the upper conduction rod 201 inside the support component 5. Finally, align the permalloy layer 101 with the permalloy base 401 through the handle 102, lower it after aligning the conduction port 103 with the upper conduction rod 201 to complete the assembly of the shielding device. At this time, align the upper conduction rod 201 with the press ram, set the press according to the experimental requirements and start it to fracture the coal and rock specimen 203, thereby enabling the sensor 307 to record the weak magnetic field signal during the experiment; after the coal and rock fracture magnetic field monitoring experiment is completed, check the monitored magnetic field signal, lift the upper shielding component 1 again through the handle 102, remove the upper conduction rod 201, and clean the fractured coal and rock specimen 203.

[0041] The present invention covers any alternatives, modifications, equivalent methods, and solutions made within the spirit and scope of the present invention. To enable the public to have a thorough understanding of the present invention, specific details are described in detail in the following preferred embodiments of the present invention. However, those skilled in the art can fully understand the present invention without these detailed descriptions. Additionally, well-known methods, processes, procedures, components, and circuits are not described in detail to avoid unnecessary confusion to the essence of the present invention.

[0042] The above are only the preferred embodiments of the present invention. It should be noted that for those of ordinary skill in the art, without departing from the principle of the present invention, several improvements and refinements can be made, and these improvements and refinements should also be regarded as the protection scope of the present invention.

Claims

1. A zero magnetic space shielding device for coal and rock fracture magnetic field monitoring experiments, characterized in that, It includes an upper shielding component and a support component. Inside the upper shielding component, a stress conduction component is provided. At the bottom of the stress conduction component, a mounting component is provided. At the bottom of the mounting component, a lower shielding component is provided. The upper shielding component is arranged on the top of the lower shielding component. The support component is connected to the stress conduction component and is used to assist the staff in conducting coal and rock fracture tests.

2. The zero magnetic space shielding device for coal and rock fracture magnetic field monitoring experiment according to claim 1, characterized in that, The upper shielding component consists of multiple layers of permalloy layers arranged at intervals and multiple handles. The multiple layers of permalloy layers are fixedly connected together with the handles by bolts. Conduction ports are provided at the tops of the multiple layers of permalloy layers. First lead ports are provided on the outer sides of one ends of the multiple layers of permalloy layers away from the handles.

3. The zero magnetic space shielding device for coal and rock fracture magnetic field monitoring experiment according to claim 2, characterized in that, The stress conduction component consists of an upper conduction rod and a lower conduction rod. A coal and rock specimen is arranged between the upper conduction rod and the lower conduction rod. The upper conduction rod passes through the conduction port from bottom to top.

4. The zero magnetic space shielding device for coal and rock fracture magnetic field monitoring experiments according to claim 3, wherein The mounting component includes a collar arranged at the bottom of the lower conduction rod. Multiple first sliding rails are fixedly connected to the outer side of the collar by bolts. Multiple second sliding rails are slidably connected inside the multiple first sliding rails. Multiple sliders are slidably connected inside the multiple second sliding rails. Screws are threadedly connected inside the multiple sliders. Elastic clamping members are fixedly connected to one ends of the multiple screws. Sensors are clamped inside the multiple elastic clamping members.

5. The zero-magnetic-space shielding device for coal and rock fracture magnetic field monitoring experiments according to claim 4, wherein The overall contour of the elastic clamping member is a "C" - shaped contour, and the two ends of the elastic clamping member away from the screw are turned outward into arc - shaped contours.

6. The zero-magnetic-space shielding device for coal and rock fracture magnetic field monitoring experiment according to claim 4, wherein The lower shielding component includes multiple layers of permalloy bases arranged at intervals. Second lead ports are provided on the outer walls of the tops of the multiple layers of permalloy bases. A threaded member is threadedly connected inside the lower conduction rod. The threaded member passes through the multiple layers of permalloy bases and the collar from bottom to top in sequence. A device bottom plate is fixedly connected to the bottom of the threaded member.

7. The zero magnetic space shielding device for coal and rock fracture magnetic field monitoring experiments according to claim 3, characterized in that, The support component includes a first pressing plate sleeved on the top of the lower conduction rod. A telescopic sleeve is fixedly connected to the bottom of the first pressing plate.

8. The zero-magnetic-space shielding device for coal and rock fracture magnetic field monitoring experiments according to claim 7, characterized in that, One end of the telescopic sleeve away from the first pressing plate is fixedly connected to a first connecting member. The telescopic sleeve and the first connecting member are sleeved on the outer wall of the lower conduction rod. The inner wall of the first connecting member fits with the outer wall of the lower conduction rod.

9. The zero-magnetic-space shielding device for coal and rock fracture magnetic field monitoring experiments according to claim 8, wherein, A connecting rod is fixedly connected to the top of the first connecting member. A second connecting member is fixedly connected to one end of the connecting rod away from the first connecting member. The coal and rock specimen is arranged inside the second connecting member.

10. The zero-magnetic-space shielding device for coal and rock fracture magnetic field monitoring experiment according to claim 9, characterized in that, Multiple spring pieces are fixedly connected to the inner wall of the second connecting member. Protrusions are provided at one ends of the multiple spring pieces. An upper pressing plate is inserted into the second connecting member. Grooves adapted to the protrusions are provided at the bottom of the upper pressing plate. Multiple elastic retaining pieces are fixedly connected to the top of the upper pressing plate.

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