CN216411140U - Experimental device for sign coal seam roof bears load electrogenesis ability - Google Patents
Experimental device for sign coal seam roof bears load electrogenesis ability Download PDFInfo
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- CN216411140U CN216411140U CN202123128374.6U CN202123128374U CN216411140U CN 216411140 U CN216411140 U CN 216411140U CN 202123128374 U CN202123128374 U CN 202123128374U CN 216411140 U CN216411140 U CN 216411140U
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Abstract
The utility model discloses an experimental device for representing the loaded electricity generating capacity of a coal seam roof, which comprises a hydraulic servo control system, a metal pressure rod, a shielding box body, a metal pressing block, a rock sample, an electrostatic instrument, a strain type sensor and a strain instrument, wherein the metal pressing rod is arranged on the hydraulic servo control system; one end of the metal pressure rod is connected with the hydraulic servo control system, and the other end of the metal pressure rod penetrates through the top of the shielding box body to be connected with the metal pressing block; the metal pressing block and the rock sample are both arranged at the central position in the shielding box body; the metal pressing blocks comprise upper and lower metal pressing blocks, and the rock sample is placed between the upper and lower metal pressing blocks; insulating sheets are arranged between the upper metal pressing block and the metal pressing rod and at the contact positions of the lower metal pressing block and the bottom of the shielding box body; the static meter comprises a first static meter and a second static meter; the first electrostatic instrument is connected with the upper metal pressing block; the second electrostatic instrument is connected with the lower metal pressing block; the strain gauge sensor is fixed on the rock sample and connected with the strain gauge. The device can carry out the test experiment of the electrogenesis ability of different coal seam roof rock specimen.
Description
Technical Field
The utility model relates to an experimental device for representing loaded power generation capacity of a coal seam roof, and belongs to the technical field of coal mine roof dynamic disaster prevention and control.
Background
The rock can generate electric effect under the stress stimulation, wherein, the granite, basalt and other rock plasm rock generate strong electromagnetic effect under the stress action, which can explain the high-frequency electromagnetic radiation formed in the earthquake process and the phenomena of earthquake light, disturbance of an ionized layer and the like generated by the high-frequency electromagnetic radiation, and provide conditions for the prediction and forecast of the earthquake generation. During mining, the coal mine roof rock generates stress concentration, rock deformation, cracking and even 'rock burst' due to disturbance, the deformation and the cracking of the coal mine roof are accompanied with the generation and the movement of electric charges during the cracking process, so that electromagnetic radiation is generated, and in fact, in order to generate any type of electromagnetic radiation, the moving electric charges must exist, and the electric charges move in a space domain or fluctuate in a time domain. In the coal mining process, the accumulation and movement of charges are caused by the regional stress action of the top plate rocks of the working face, the power generation capacities of different coal seam top plates under the stress action are different, the power generation capacities of different coal seam top plates are detected, the stress change and damage fracture of the coal seam top plates can be predicted, and prediction and forecast are provided for top plate power disasters in the coal mining process.
Therefore, a new technology of an experimental device capable of representing the loaded power generation capacity of the coal seam roof is urgently needed.
SUMMERY OF THE UTILITY MODEL
Aiming at the problems in the prior art, the utility model provides the experimental device for representing the loaded power generation capacity of the coal seam roof, the current and the voltage generated by different coal seam roofs in the loaded state can be obtained, the power generation intensity of the coal seam roof is calculated through the analysis, the power generation capacity is evaluated, and the prediction of the dynamic disaster of the underground rock mass of the coal mine is facilitated.
In order to achieve the purpose, the utility model adopts the technical scheme that: an experimental device for representing the loaded power generation capacity of a coal seam roof comprises a hydraulic servo control system, a metal pressure rod, a shielding box body, a metal pressing block, a rock sample, an electrostatic instrument, a strain type sensor and a strain instrument;
the hydraulic servo control system is connected with the metal pressure rod and used for controlling the metal pressure rod to vertically and downwards carry out loading motion at different loading rates to act on the rock sample and simultaneously recording the stress in the loading process;
the metal pressing block and the rock sample are both arranged at the central position in the shielding box body; the metal pressing block comprises an upper metal pressing block and a lower metal pressing block, and the rock sample is placed between the upper metal pressing block and the lower metal pressing block;
one end of the metal pressure rod is connected with the hydraulic servo control system, and the other end of the metal pressure rod penetrates through the top of the shielding box body to be connected with the upper metal pressing block; the center of the top of the shielding box body is provided with a through hole, the metal pressure rod penetrates through the through hole and extends into the shielding box body, and the metal pressure rod and the through hole are sealed in a sliding mode through a piston sealing structure;
insulating sheets are arranged between the upper metal pressing block and the metal pressing rod and at the contact positions of the lower metal pressing block and the bottom of the shielding box body;
the static meter comprises a first static meter and a second static meter; the first electrostatic instrument is connected with the upper metal pressing block through a shielding cable and used for testing voltage generated in the rock sample loading process; the second electrostatic instrument is connected with the lower metal pressing block through a shielding cable and is used for testing current generated in the rock sample loading process;
the strain gauge sensor is pasted and fixed on the central surface of the rock sample, the strain gauge sensor is connected with the anode of the strain gauge through a shielding cable, and the strain gauge is used for recording the strain in the loading process of the rock sample.
Further, the shielding box body is a cuboid structure made of a magnetic conductive material, and a door capable of being opened and closed is arranged on one side of the shielding box body and used for conveniently placing a metal pressing block, an insulating sheet and a rock sample.
Furthermore, a transparent observation window is arranged on the switchable door, and the transparent observation window is made of magnetic conductive glass.
Furthermore, the inner wall of the shielding box body is also provided with a metal net for further enhancing the shielding effect.
Furthermore, the metal mesh is a twill copper mesh with the mesh size of 200 meshes, and the wire diameter of the copper mesh is 0.05 mm.
Furthermore, the lower surface of the upper metal pressing block and the upper surface of the lower metal pressing block are both provided with grooves matched with the upper surface and the lower surface of the rock sample.
Further, copper adhesive tapes are adhered to the side faces of the upper metal pressing block and the lower metal pressing block and used for adhering and fixing the shielding cable on the metal pressing blocks; the copper adhesive tape adhered on the upper metal pressing block and the copper adhesive tape adhered on the lower metal pressing block are on the same axis.
Further, one surface of the copper tape is adhered with a copper foil, and the other surface of the copper tape is adhered with a release film; one surface of the copper adhesive tape, which is adhered with the copper foil, is attached to the surface of the metal pressing block; and the resistance test values of the two sides of the copper adhesive tape are zero.
Further, the positive electrodes of the first static electricity meter and the second static electricity meter are connected with a shielding cable, and the negative electrodes of the first static electricity meter and the second static electricity meter are grounded;
one side of the shielding box body is connected with a grounding copper sheet for grounding the shielding box body;
the first static electricity meter and the second static electricity meter are both connected with a computer.
Furthermore, the insulation sheet is a circular sheet with the resistance value larger than 2.4M omega and the diameter of 80 mm; the current testing range of the first electrostatic instrument and the second electrostatic instrument is 10 pA-10A, and the voltage testing range is 100 pV-100V; the strain range of the strain gauge is 0 to +/-60000 microstrain.
Compared with the prior art, the utility model has the beneficial effects that:
the utility model discloses an experimental device for representing the loaded electricity generating capacity of a coal seam roof, which is suitable for detecting the electricity generating capacity of a hard coal seam roof rock mass. The experimental device comprises a hydraulic servo control system, a metal pressure rod, a shielding box body, a metal pressing block, a rock sample, an electrostatic instrument, a strain type sensor and a strain gauge. The rock sample is arranged between the upper metal pressing block and the lower metal pressing block, the hydraulic servo control system can record stress and strain in the rock sample loading process, the shielding box body can shield external electromagnetic interference, the shielding cable can effectively shield noise, the experimental device records current and voltage generated in the rock sample cracking process by loading a rock sample on the coal seam roof until the rock sample cracks, and finally calculates the electricity generation strength of the coal seam roof and evaluates the electricity generation capacity; the utility model can develop the test experiment of the power generation capacity of different coal seam roof rock samples, and can truly and accurately simulate the capacity of generating power and causing secondary disasters after different types of rock masses under the coal mine are pressed. The device can realize the capability of a laboratory in generating electricity for the coal seam roof and causing secondary disasters, and is favorable for predicting the dynamic disasters of the underground rock mass of the coal mine.
Drawings
FIG. 1 is a schematic structural view of the present invention;
fig. 2 is a perspective view of the shield case of the present invention.
In the figure: 1. the device comprises a metal pressure rod, 2, a shielding box body, 31, an upper metal pressing block, 32, a lower metal pressing block, 4, an insulating sheet, 5, a rock sample, 6, a copper adhesive tape, 7, a metal net, 8, a shielding cable, 91, a first electrostatic instrument, 92, a second electrostatic instrument, 10, a computer, 11, a hydraulic servo control system, 12, a strain type sensor, 13, a strain instrument, 14 and a grounding copper sheet.
Detailed Description
For the purpose of enhancing the understanding of the present invention, the present invention will be further described with reference to the accompanying drawings, which are provided for the purpose of illustration only and are not intended to limit the scope of the present invention.
In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like, indicate orientations or positional relationships based on those shown in the drawings, and are used only for convenience in describing the present invention and for simplicity in description, and do not indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and thus, are not to be construed as limiting the present invention. Furthermore, the terms "first", "second", etc. are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first," "second," etc. may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless otherwise specified.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art through specific situations.
The present invention will be described in detail below with reference to the embodiments with reference to the attached drawings.
As shown in fig. 1 and 2, an experimental device for representing the loaded power generation capacity of a coal seam roof comprises a hydraulic servo control system 11, a metal pressure rod 1, a shielding box body 2, a metal pressing block, a rock sample 5, an electrostatic meter, a strain type sensor 12 and a strain gauge 13.
The hydraulic servo control system 11 is connected with the metal pressure rod 1 and is used for controlling the metal pressure rod 1 to vertically and downwards perform loading motion at different loading rates to act on the rock sample 5 and simultaneously recording the stress in the loading process;
the metal pressing block and the rock sample 5 are both arranged at the central position in the shielding box body 2; the metal pressing block comprises an upper metal pressing block 31 and a lower metal pressing block 32, and the rock sample 5 is placed between the upper metal pressing block 31 and the lower metal pressing block 32;
one end of the metal pressure rod 1 is connected with the hydraulic servo control system 11, and the other end of the metal pressure rod passes through the upper part of the shielding box body 2 and is connected with an upper metal pressing block 31;
insulating sheets 4 are arranged between the upper metal pressing block 31 and the metal pressing rod 1 and at the contact positions of the lower metal pressing block 32 and the bottom of the shielding box body 2;
the static electricity meter comprises a first static electricity meter 91 and a second static electricity meter 92; the first electrostatic instrument 91 is connected with the upper metal pressing block 31 through a shielding cable 8 and is used for testing the voltage generated in the loading process of the rock sample 5; the second electrostatic instrument 92 is connected with the lower metal pressing block 32 through a shielding cable 8 and is used for testing current generated in the loading process of the rock sample 5;
According to the experimental device for representing the loaded electricity generating capacity of the coal seam roof, the rock sample of the coal seam roof is loaded until the rock sample is broken, the two electrostatic meters respectively record the current and the voltage generated in the breaking process of the rock sample, and finally the electricity generating intensity of the coal seam roof is calculated and the electricity generating capacity is evaluated; the utility model can develop the test experiment of the power generation capacity of different coal seam roof rock samples, and can truly and accurately simulate the capacity of generating power and causing secondary disasters after different types of rock masses under the coal mine are pressed.
In a specific embodiment, the shielding box body 2 is a cuboid structure made of a magnetic conductive material, and one surface of the shielding box body is provided with a switchable door for conveniently placing a metal pressing block, an insulating sheet 4 and a rock sample; the openable door is provided with a transparent observation window which is made of magnetic conductive glass. One side of the shielding box body 2 is connected with a grounding copper sheet 14 for grounding the shielding box body 2, as shown in fig. 2. The inner wall of the shielding box body 2 is also provided with a metal net 7 for further enhancing the shielding effect; the metal mesh 7 is made of a twill copper mesh with the mesh size of 200 meshes, and the wire diameter of the copper mesh is 0.05 mm. The metal pressing block, the insulating sheet 4 and the rock sample 5 are all arranged at the central position in the shielding box body 2 with the metal net 7 inside, so that external electromagnetic interference can be effectively shielded.
In a specific embodiment, the lower surface of the upper metal pressing block and the upper surface of the lower metal pressing block are both provided with grooves matched with the upper surface and the lower surface of the rock sample; the rock sample can be better fixed, and unstable placement of the rock sample in the loading process is prevented. Copper tapes 6 are adhered to the side surfaces of the upper metal pressing block 31 and the lower metal pressing block 32 and used for adhering and fixing the shielding cable 8 on the metal pressing blocks; the copper adhesive tape 6 adhered on the upper metal pressing block 31 and the copper adhesive tape 6 adhered on the lower metal pressing block 32 are on the same axis. One surface of the copper tape 6 is adhered with a copper foil, and the other surface is adhered with a release film; one surface of the copper tape 6, which is adhered with the copper foil, is adhered to the surface of the metal pressing block; and the resistance test values of the two sides of the copper tape 6 are zero.
In a specific embodiment, the positive electrodes of the first electrostatic meter 91 and the second electrostatic meter 92 are connected to the shielding cable 8, and the negative electrodes are grounded; the shield cable 8 can effectively shield noise. The first static electricity meter 91 and the second static electricity meter 92 are both connected with a computer 10; the computer 10 may store data collected by the electrostatics and may capture a large amount of data from transient events using analog to digital conversion to meet data logging requirements.
In one embodiment, the metal compact is 80mm long, 80mm wide, 50mm high, and the amount of strain occurring under stress is less than 0.1%. The bedding direction of the rock sample 5 is vertical to the loaded direction, and the rock sample is a rock with high homogeneity and good mechanical property through ultrasonic wave speed test; and the rock sample 5 is processed into a cylinder with the diameter of 50mm and the height of 100mm, the upper surface and the lower surface of the rock sample 5 are polished and leveled, the surface roughness is not more than +/-0.05 mm, the end face is perpendicular to the axis, the maximum deviation is not more than 0.5 ℃, and the processed rock sample 5 is dried in a vacuum drying oven at 100 ℃ for 48 hours. And cylindrical grooves with the diameter of 50mm and the height of 5mm are formed in the lower surface of the upper metal pressing block and the upper surface of the lower metal pressing block. The resistance value of the insulating sheet 4 is larger than 2.4M omega, and the diameter of the insulating sheet is 80mm round. The current testing range of the first electrostatic instrument 91 and the second electrostatic instrument 92 is 10 pA-10A, and the voltage testing range is 100 pV-100V; the strain range of the strain gauge 13 is 0 to +/-60000 microstrain. The size of the copper adhesive tape 6 is 30mm multiplied by 30 mm. The hydraulic servo control system 11 is a conventional device in the prior art, such as an electrohydraulic universal testing machine.
Example 1:
the experimental method for representing the loaded electrogenesis capacity of the coal seam roof by adopting the experimental device comprises the following specific steps:
A. selecting granite as an experimental rock mass, processing the granite into a cylinder with the diameter of 50mm and the height of 100mm, and then putting the cylinder into a vacuum drying oven at 100 ℃ for drying for 48 hours;
B. sequentially placing an insulating sheet 4, a metal pressing block and a processed granite rock sample 5 into the shielding box body 2, placing the metal pressing block, the insulating sheet 4 and the rock sample in the central position of the shielding box body 2, and insulating the lower metal pressing block and the shielding box body 2 by using the insulating sheet 4; vertically placing a rock sample 5 between an upper metal pressing block 31 and a lower metal pressing block 32, namely, the long axis direction is the loading direction, adjusting a metal pressing rod 1 through a hydraulic servo control system 11 to enable the metal pressing rod 1 to be in contact with the upper metal pressing block, and insulating sheets 4 are used for insulating the upper metal pressing block and the metal pressing rod 1;
C. the strain sensor 12 is stuck and fixed on the central surface of the rock sample and then connected with the strain gauge 13 through a shielding cable; adhering a copper adhesive tape 6 on the surface of the metal pressing block, respectively connecting the metal pressing block with the positive electrodes of two electrostatic instruments through a shielding cable 8, grounding the negative electrodes of the electrostatic instruments, recording the generated current value by a first electrostatic instrument 91, and the generated voltage value by a second electrostatic instrument 92, and then closing a door of the shielding box body after connection, and simultaneously grounding the shielding box body through a grounding copper sheet 14;
D. simultaneously starting a hydraulic servo control system 11, an electrostatic instrument and a strain gauge 13, setting a loading rate of 0.5kN/s by a program, wherein the loading mode is linear loading; observing through the transparent observation window after the rock sample 5 is brokenStopping loading the electrostatic instrument and the strain gauge 13, storing test data, and recording the maximum stress S when the rock sample 5 is cracked in the loading process through the hydraulic servo control system 11maxRecording the maximum strain epsilon of the rock sample during the fracture of the rock sample in the loading process by a strain gaugemaxRecording the current A and the voltage V in the loading process by an electrostatic instrument;
E. calculating the Young modulus Y of the rock sample 5:
F. calculating the power generation capacity of the coal seam roof, wherein the power generation capacity is represented by W, the power generation capacity of the coal seam roof rock sample is determined according to the W value, the larger the W value is, the stronger the power generation capacity is, and the calculation formula of W is (a):
in the formula N1、N2The sampling times of the two electrostatic meters are respectively, and the experimental results are shown in table 1.
Table 1:
as can be seen from Table 1: granite has a maximum stress of 60.01MPa, a maximum strain of 0.2012% and a Young's modulus of 2.9823 at a loading rate of 0.5kN/s, loaded to fracture. The generated current and voltage are respectively 4.96nA, 5.34nA, 52.04nA and 0.228V, 0.153V and 0.484V at 11.04s, 112.06s and 235.92 s; the calculated power generation capacity W is 17.8480 (10)4MPa·nA·V)。
Example 2:
in the present embodiment, marble rock is selected as the experimental rock mass, the experimental process is completely the same as that in embodiment 1, and the experimental results are shown in table 2.
TABLE 2
As can be seen from Table 2, the marble exhibited a Young's modulus of 1.4827 at a loading rate of 0.5kN/s with a maximum stress of 77.73MPa and a maximum strain of 0.5242% during loading to fracture. The generated current and voltage are respectively 2.66nA, 2.78nA, 43.98nA and 0.004V, 0.019V and 0.322V at 80.12s, 200.34s and 303.99 s; the calculated power generation capacity W is 2.8088 (10)4MPa·nA·V)。
Example 3:
in this example, sandstone was selected as the experimental rock, and the experimental process is exactly the same as that in example 1, and the experimental results are shown in table 3.
TABLE 3
As can be seen from table 3, sandstone has a maximum stress of 159.81MPa, a maximum strain of 0.5725%, and a young's modulus of 2.7912 at a loading rate of 0.5kN/s, when loaded into fracture. The generated current and voltage are respectively 2.12nA, 2.32nA, 98.15nA and 0.103V, 0.078V and 1.607V at 4.15s, 193.12s and 629.33 s; the calculated power generation capacity W is 56.886 (10)4MPa·nA·V)。
In conclusion, the utility model provides an experimental device and method for representing the loaded electricity generating capacity of a coal seam roof, and the experimental device and method are suitable for detecting the electricity generating capacity of the rock mass of the hard coal seam roof. The experimental device comprises a hydraulic servo control system, a metal pressure rod, a shielding box body, a metal pressing block, a rock sample, an electrostatic instrument, a strain type sensor and a strain gauge. The rock sample is arranged between the upper metal pressing block and the lower metal pressing block, the hydraulic servo control system can record stress and strain in the rock sample loading process, the shielding box body can shield external electromagnetic interference, the shielding cable can effectively shield noise, the experimental device records current and voltage generated in the rock sample cracking process by loading a rock sample on the coal seam roof until the rock sample cracks, and finally calculates the electricity generation strength of the coal seam roof and evaluates the electricity generation capacity; the utility model can develop the test experiment of the power generation capacity of different coal seam roof rock samples, and can truly and accurately simulate the capacity of generating power and causing secondary disasters after different types of rock masses under the coal mine are pressed. By adopting the device and the method, the power generation capability of a laboratory on the coal bed roof and the secondary disaster initiation capability can be realized, and the prediction of the dynamic disaster of the underground rock mass of the coal mine is facilitated.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. An experimental device for representing the loaded power generation capacity of a coal seam roof is characterized by comprising a hydraulic servo control system, a metal pressure rod, a shielding box body, a metal pressing block, a rock sample, an electrostatic instrument, a strain type sensor and a strain gauge;
the hydraulic servo control system is connected with the metal pressure rod and used for controlling the metal pressure rod to vertically and downwards carry out loading motion at different loading rates to act on the rock sample and simultaneously recording the stress in the loading process;
the metal pressing block and the rock sample are both arranged at the central position in the shielding box body; the metal pressing block comprises an upper metal pressing block and a lower metal pressing block, and the rock sample is placed between the upper metal pressing block and the lower metal pressing block;
one end of the metal pressure rod is connected with the hydraulic servo control system, and the other end of the metal pressure rod penetrates through the top of the shielding box body to be connected with the upper metal pressing block; the center of the top of the shielding box body is provided with a through hole, the metal pressure rod penetrates through the through hole and extends into the shielding box body, and the metal pressure rod and the through hole are sealed in a sliding mode through a piston sealing structure;
insulating sheets are arranged between the upper metal pressing block and the metal pressing rod and at the contact positions of the lower metal pressing block and the bottom of the shielding box body;
the static meter comprises a first static meter and a second static meter; the first electrostatic instrument is connected with the upper metal pressing block through a shielding cable and used for testing voltage generated in the rock sample loading process; the second electrostatic instrument is connected with the lower metal pressing block through a shielding cable and is used for testing current generated in the rock sample loading process;
the strain gauge sensor is pasted and fixed on the central surface of the rock sample, the strain gauge sensor is connected with the anode of the strain gauge through a shielding cable, and the strain gauge is used for recording the strain in the loading process of the rock sample.
2. The experimental device for characterizing the loaded power generation capacity of the coal seam roof as claimed in claim 1, wherein the shielding box body is a cuboid structure made of magnetic conductive material, and one face of the shielding box body is provided with a switchable door for conveniently placing a metal pressing block, an insulating sheet and a rock sample.
3. The experimental device for characterizing the loaded power generation capacity of the coal seam roof as claimed in claim 2, wherein a transparent observation window is arranged on the openable door, and the transparent observation window is made of magnetic conductive glass.
4. The experimental device for characterizing the loaded electricity generating capacity of the coal seam roof as claimed in claim 2 or 3, wherein the inner wall of the shielding box body is further provided with a metal mesh for further enhancing the shielding effect.
5. The experimental device for characterizing the loaded power generation capacity of the coal seam roof plate according to claim 4, wherein the metal mesh is a twill copper mesh with a mesh size of 200 meshes, and the wire diameter of the copper mesh is 0.05 mm.
6. The experimental device for representing the loaded electricity generating capacity of the coal seam roof as claimed in claim 1, wherein the lower surface of the upper metal pressing block and the upper surface of the lower metal pressing block are provided with grooves matched with the upper surface and the lower surface of the rock sample.
7. The experimental device for representing the loaded power generation capacity of the coal seam roof as claimed in claim 1, wherein copper adhesive tapes are adhered to the side surfaces of the upper metal pressing block and the lower metal pressing block and used for adhering and fixing the shielding cable on the metal pressing blocks; the copper adhesive tape adhered on the upper metal pressing block and the copper adhesive tape adhered on the lower metal pressing block are on the same axis.
8. The experimental device for characterizing the loaded electrogenesis capability of the coal seam roof as claimed in claim 7, wherein one side of the copper tape is adhered with a copper foil, and the other side is adhered with a release film; one surface of the copper adhesive tape, which is adhered with the copper foil, is attached to the surface of the metal pressing block; and the resistance test values of the two sides of the copper adhesive tape are zero.
9. The experimental device for characterizing the loaded power generation capacity of the coal seam roof plate according to claim 1, wherein the positive electrodes of the first electrostatic instrument and the second electrostatic instrument are connected with a shielding cable, and the negative electrodes are grounded;
one side of the shielding box body is connected with a grounding copper sheet for grounding the shielding box body;
the first static electricity meter and the second static electricity meter are both connected with a computer.
10. The experimental device for characterizing the loaded power generation capacity of the coal seam roof plate according to claim 1, wherein the insulating sheet is a circular sheet with a resistance value of more than 2.4M Ω and a diameter of 80 mm; the current testing range of the first electrostatic instrument and the second electrostatic instrument is 10 pA-10A, and the voltage testing range is 100 pV-100V; the strain range of the strain gauge is 0 to +/-60000 microstrain.
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