Electromagnetic radiation monitor for coal rock dynamic disaster monitoring and monitoring method thereof

Abstract

The invention discloses an electromagnetic radiation monitor for coal rock dynamic disaster monitoring and a monitoring method thereof. The monitor comprises a control cabinet and a plurality of electromagnetic radiation monitoring terminals. The electromagnetic radiation monitoring terminal comprises an explosion-proof shell, a mounting bracket and a plurality of magnetic field sensors; a slave controller, a slave memory, a signal generation circuit, a high-speed data acquisition module and a slave communication module are arranged in the explosion-proof shell; and the control cabinet is arranged outside the mine and is provided with a main controller, a main memory, a router and a main communication module. According to the electromagnetic radiation monitor and the monitoring method thereof, collection of multi-point combined electromagnetic signals in a mine can be realized by using a plurality of electromagnetic radiation monitoring terminals, so that reliable data support is provided for coal and rock dynamic disasters; and full-waveform high-speed acquisition of electromagnetic signals can be realized by using the high-speed data acquisition module.

Description

Technical Field

[0001] The present invention relates to an electromagnetic radiation monitor and a monitoring method thereof, and particularly to an electromagnetic radiation monitor for monitoring coal and rock dynamic disasters and a monitoring method thereof. Background Art

[0002] With the increase of mining depth, the problems faced by mining engineering become more complex, and the resulting engineering disaster accidents are more serious, especially the increasing risks of gas outburst and rock burst. Therefore, it is necessary to explore effective deep mining and construction technologies, as well as basic theories and technical means for preventing and controlling engineering disasters. At present, the main methods for predicting and forecasting rock bursts include the drill cuttings method, microseismic method, acoustic emission method, electromagnetic radiation method, etc. Among them, the electromagnetic radiation method is to monitor the loading degree of coal and rock masses and the energy release of deformation and fracture, and judge the danger and degree of danger of rock bursts through its changes.

[0003] The earliest recorded electromagnetic disturbance can be traced back to the earthquake anomaly in 1887. In the early 1970s, the Uzbek Academy of Sciences confirmed that the earth's crust emits electromagnetic pulses, and the emission intensity rises sharply before earthquakes. After the Tangshan earthquake, China began to study the electromagnetic radiation anomaly before earthquakes. In the mid-1970s, Qian Shuqing, Hao Jinqi et al. from the Institute of Geophysics, China Earthquake Administration, and Zhang Deqi et al. from the Jiangsu Earthquake Administration carried out experimental studies on rock electromagnetic radiation. Zhang Deqi et al. from the Jiangsu Earthquake Administration completed the national 85th key project based on the theoretical research of rock electromagnetic radiation, developed the DUF-1 type impending earthquake electromagnetic radiation monitoring terminal, and applied it to the precursor observation of earthquake electromagnetic waves. During the same period, Japan, Greece, the United States, Sweden, Germany, etc. also carried out research in this area. At the beginning of this century, Professor Dou Linming, Professor Wang Enyuan et al. from China University of Mining and Technology carried out relevant research on the electromagnetic radiation of coal and rock masses based on the phenomenon of rock electromagnetic radiation. On this basis, various monitoring instruments such as KDB5 and KDB7 for the electromagnetic radiation of coal and rock masses during coal mine excavation were developed, and remarkable results have been achieved in the prevention and control of rock bursts. Recently, Feng Zhisheng, a second-level researcher et al. from the Jiangsu Earthquake Administration carried out research on the propagation mechanism of earthquake electromagnetic waves, proposed a full-waveform acquisition and analysis scheme, and applied it to the observation of earthquake electromagnetic waves, achieving remarkable results.

[0004] Electromagnetic radiation and acoustic emission monitoring instruments such as the KBD5 type and KBD7 type electromagnetic radiation monitoring terminals, YDD16 portable acoustic and electric monitoring instruments, and GDD12 online acoustic and electric monitoring devices have been widely used in the monitoring of electromagnetic radiation (acoustic emission) of coal and rock masses during coal mine excavation. They mainly focus on the change process of the monitoring object in a frequency band and time domain, and are commonly expressed as the number of pulses and the field strength magnitude on the time axis, and certain results have been achieved in practical applications.

[0005] In summary, coal and rock electromagnetic radiation has the characteristics of wide frequency band and changing main frequency band. If the signal waveform characteristics are ignored and the original coal and rock electromagnetic radiation signal is directly described only by the pulse number and intensity, on the one hand, it may cause the omission of coal and rock electromagnetic radiation information; on the other hand, electromagnetic interference may be misidentified as an effective signal, resulting in inaccurate coal and rock electromagnetic radiation information. Both of these aspects will have a serious impact on the identification of precursor information of rock bursts. None of the current monitoring instruments in application can achieve full-waveform acquisition with high speed and wide frequency band, and cannot obtain signal analysis in the frequency domain. It can be found from seismic electromagnetic research that electromagnetic wave monitoring should obtain the entire waveform of the signal within the observed frequency band to obtain its reliable information. Summary of the Invention

[0006] The invention aims to provide an electromagnetic radiation monitor for monitoring coal and rock dynamic disasters and its monitoring method, which can perform full-waveform acquisition on the electromagnetic waves in the process of electromagnetic energy radiated outward during the loading, deformation and fracture of coal and rock masses in the mine, so as to provide reliable data support for coal and rock dynamic disasters.

[0007] Technical solution: The electromagnetic radiation monitor for monitoring coal and rock dynamic disasters of the present invention includes a control cabinet and a plurality of electromagnetic radiation monitoring terminals; the electromagnetic radiation monitoring terminal includes an explosion-proof housing, a mounting bracket and a plurality of magnetic field sensors; a slave controller, a slave memory, a signal generation circuit, a high-speed data acquisition module and a slave communication module are arranged in the explosion-proof housing; each magnetic field sensor is installed on the upper side and the lower side edges of the explosion-proof housing in an angle-adjustable manner for multi-angle magnetic field detection; the mounting bracket is arranged at the center of the lower side of the explosion-proof housing for fixing the explosion-proof housing on the installation surface inside the mine; the slave controller is electrically connected to the slave memory, the signal generation circuit, the slave communication module and the high-speed data acquisition module respectively, the high-speed data acquisition module and the signal generation circuit are both electrically connected to each magnetic field sensor, the high-speed data acquisition module collects data from each magnetic field sensor, and the signal generation circuit sends a standard calibration signal to each magnetic field sensor; the control cabinet is arranged outside the mine and is provided with a master controller, a master memory, a router and a master communication module; the master controller is electrically connected to the master memory, the router and the master communication module respectively; the master communication module is communicatively connected to each slave communication module through explosion-proof cables.

[0008] Further, the explosion-proof housing includes an upper housing and a lower housing, and the upper housing and the lower housing are detachably assembled; hinge mounting grooves are arranged in the middle of the four edges of the upper side of the upper housing and the middle of the four edges of the lower side of the lower housing; a sensor mounting seat is swingably hinged on the hinge mounting groove in a pitching manner, and the swinging angle of the end of the hinge shaft on one side of the sensor mounting seat is locked by an angle locking mechanism; the magnetic field sensor is fixedly installed on the sensor mounting seat.

[0009] Furthermore, the angle locking mechanism includes a telescopic insertion bar, a resilient compression spring, and a locking disc; a locking cavity is provided at the end of the hinge shaft, and the locking disc is fixed to the end of the hinge shaft; the end of the telescopic insertion bar is movably inserted into the locking cavity, and the other end extends outside the explosion-proof housing; an angle locking seat is provided at the insertion end of the telescopic insertion bar, and an arc-shaped groove that cooperates with the circumferential surface of the locking disc is provided on the angle locking seat; limiting convex strips that are engaged with each other are provided on the circumferential surface of the locking disc and the inner wall of the arc-shaped groove; the resilient compression spring is installed in the locking cavity and is used to push the locking disc against the arc-shaped groove.

[0010] Furthermore, the magnetic field sensor includes a coil assembly, a magnetic core, an internal circuit board, an explosion-proof housing, inner arc-shaped shielding blades, and outer arc-shaped shielding blades; the magnetic core is fixed inside the coil assembly; a coil fixing cavity and a circuit fixing cavity are provided inside the explosion-proof housing; the coil assembly is detachably installed in the coil fixing cavity; the internal circuit board is detachably installed in the circuit fixing cavity, and a signal processing circuit electrically connected to the coil assembly is provided on the internal circuit board, and the signal processing circuit is electrically connected to the high-speed data acquisition module and the signal generation circuit respectively; the end of the explosion-proof housing is fixed to the sensor mounting seat through a mounting connection column; two blade support rings are rotatably installed on the mounting connection column; the ends of the inner arc-shaped shielding blades and the outer arc-shaped shielding blades are respectively connected and fixed to the two blade support rings through connecting support bars, and both the inner arc-shaped shielding blades and the outer arc-shaped shielding blades are partially surrounded outside the explosion-proof housing.

[0011] Further, the coil assembly includes a bobbin, three middle induction coils, two end induction coils, six feedback coils, and two ground coils; the magnetic core is coaxially and fixedly arranged inside the bobbin; six first annular grooves, three second annular grooves, and two third annular grooves are provided on the outer wall of the middle of the bobbin, and the three second annular grooves and the two third annular grooves are respectively located in five interval areas between the six first annular grooves, the three second annular grooves are located between the two third annular grooves, and the distance between adjacent first annular grooves and second annular grooves is equal to the distance between adjacent first annular grooves and third annular grooves; one fourth annular groove is provided on the outer walls at both ends of the bobbin; the two ground coils are respectively located in the two fourth annular grooves and are both electrically connected to the ground input terminal of the signal processing circuit; the three middle induction coils are respectively located in the three second annular grooves, the two end induction coils are respectively located in the two third annular grooves, and the six feedback coils are respectively located in the six first annular grooves; the six feedback coils are connected in sequence to form a feedback coil circuit, and one end of the feedback coil circuit is electrically connected to the ground coil, and the other end is electrically connected to the feedback signal input terminal of the signal processing circuit; the three middle induction coils and the two end induction coils are connected in sequence according to their positions to form a detection coil circuit, and one end of the detection coil circuit is electrically connected to one end of the ground coil, and the other end is electrically connected to the electromagnetic signal input terminal of the signal processing circuit; the other end of the ground coil is electrically connected to the ground input terminal of the signal processing circuit; the signal processing circuit is used for amplifying the electromagnetic signal at the electromagnetic signal input terminal and feeding back the amplified electromagnetic signal to the feedback signal input terminal; the signal processing circuit is provided with an electromagnetic signal output terminal for outputting the amplified electromagnetic signal, and the electromagnetic signal output terminal is electrically connected to the signal acquisition terminal of the high-speed data acquisition module; the signal processing circuit is further provided with a calibration signal input terminal electrically connected to the feedback signal input terminal, and the calibration signal input terminal is electrically connected to the signal generation circuit.

[0012] Further, the groove width of the fourth annular groove is smaller than that of the first annular groove, the groove width of the first annular groove is smaller than that of the third annular groove, and the groove width of the third annular groove is smaller than that of the second annular groove; the middle induction coil has forty turns and is wound in a single layer and laid flat in the second annular groove; the end induction coil has twenty turns and is wound in a single layer and laid flat in the third annular groove; the feedback coil has two turns and is wound in a single layer and laid flat in the first annular groove; the ground coil has one turn and is wound in the fourth annular groove.

[0013] Further, the signal processing circuit includes a terminal P1, a preamplifier U1, a constant current source chip U4, a first operational amplifier U2, a second operational amplifier U3, resistors R3, R4, R5, R6, R7, R8, R9, R10, R11, R12, R13, R14, R16, R19, R21, R24, R25, R28, R29, capacitors C3, C6, C7, C8, C9, C10, C12, and a diode D6; the electromagnetic signal input terminal of the terminal P1 is electrically connected to one end of the resistor R13 and the G1 input of the preamplifier U1 respectively, the ground input terminal of the terminal P1 is grounded after being electrically connected to the other end of the resistor R13, and the feedback signal input terminal of the terminal P1 is electrically connected to one end of the resistor R21, one end of the resistor R19, and one end of the resistor R28 respectively; the other end of the resistor R28 is electrically connected to one end of the resistor R29 to serve as a calibration signal input terminal, and the other end of the resistor R29 is grounded; the other end of the resistor R21 is electrically connected to one end of the capacitor C12, and the other end of the capacitor C12 is electrically connected to the other end of the resistor R19, one end of the capacitor C8, one end of the resistor R12, the output terminal of the first operational amplifier U2, and one end of the capacitor C7 respectively; the negative terminal of the diode D6 is electrically connected to one end of the resistor R25 and then to the negative voltage source VEE, the positive terminal of the diode D6 is electrically connected to the V- pin of the constant current source chip U4 and one end of the resistor R24 respectively, and the other end of the resistor R24 is electrically connected to the other end of the resistor R25 and the ADJ pin of the constant current source chip U4 respectively; the V+ pin of the constant current source chip U4 is electrically connected to the S1 pin and the S2 pin of the preamplifier U1 respectively; the VCL pin of the preamplifier U1 is electrically connected to the negative voltage source VEE, the G2 pin of the preamplifier U1 is electrically connected to one end of the resistor R14, the other end of the capacitor C8, and the other end of the resistor R12 respectively, and the other end of the resistor R14 is grounded; the VCH pin of the preamplifier U1 is electrically connected to the positive voltage source VCC, the D1 pin of the preamplifier U1 is electrically connected to one end of the resistor R3, one end of the resistor R6, and one end of the resistor R7 respectively, and the D2 pin of the preamplifier U1 is electrically connected to one end of the resistor R10, one end of the capacitor C6, and one end of the resistor R4 respectively; the other end of the resistor R3 is electrically connected to the other end of the resistor R4 and then to the positive voltage source VCC; the other end of the resistor R6 is electrically connected to the other end of the capacitor C6; the other end of the resistor R7 is electrically connected to the negative input terminal of the first operational amplifier U2, and the other end of the resistor R10 is electrically connected to the positive input terminal of the first operational amplifier U2;The other end of the capacitor C7 is electrically connected to one end of the resistor R8. The other end of the resistor R8 is respectively electrically connected to the negative input terminal of the second operational amplifier U3, one end of the capacitor C3, and one end of the resistor R5. The other end of the capacitor C3 is respectively electrically connected to one end of the resistor R9, the output terminal of the second operational amplifier U3, and the other end of the resistor R5. The other end of the resistor R9 serves as the electromagnetic signal output terminal of the signal processing circuit. The positive input terminal of the second operational amplifier U3 is respectively electrically connected to one end of the resistor R11, one end of the capacitor C9, and one end of the resistor R16. The other end of the capacitor C9 and the other end of the resistor R16 are connected and grounded after being connected. The other end of the resistor R11 is electrically connected to one end of the capacitor C10, and the other end of the capacitor C10 is grounded.;

[0014] Further, a ventilation window is vertically and penetratingly provided in the middle of the upper housing, and a heat dissipation channel is vertically provided in the middle of the lower housing and is docked with the ventilation window. A middle platform is horizontally provided at the lower end of the heat dissipation channel through a radial support pipe. The mounting bracket is arranged on the lower side surface of the middle platform, and an electrical control box is arranged on the upper side surface of the middle platform. A slave control circuit board and a driving motor are arranged in the electrical control box. The slave controller, the slave memory, and the slave communication module are all arranged on the slave control circuit board, and a temperature sensor and a heat dissipation driving circuit electrically connected to the slave controller are arranged on the slave control circuit board. A transmission shaft is rotatably installed through the center of the top of the electrical control box, and a plurality of cantilever rods are horizontally fixed at the upper end of the transmission shaft. A heat dissipation suspension rod is vertically arranged below the cantilever end of each cantilever rod. A heat dissipation scraping blade is obliquely arranged at the lower end of the heat dissipation suspension rod, and each heat dissipation scraping blade is at a different height. The heat dissipation driving circuit is electrically connected to the driving motor, and the driving motor is used to drive the transmission shaft to rotate. A plurality of heat dissipation blocks are fixedly arranged on the circumferential side wall of the electrical control box, and the heat dissipation thin sheets of each heat dissipation block horizontally extend out of the electrical control box to form an annular heat dissipation area at different heights outside the electrical control box. Each heat dissipation scraping blade horizontally moves in the annular heat dissipation area at different height positions. An annular heat conduction flat tube is arranged in the electrical control box, and the annular heat conduction flat tube is closely attached to the heat dissipation block. A chip heat dissipation strip extending to the slave control circuit board and a motor heat dissipation strip extending to the driving motor are fixedly connected to the annular heat conduction flat tube, and an arc-shaped heat conduction plate closely attached to the side wall of the driving motor is arranged at the end of the motor heat dissipation strip.

[0015] Furthermore, the mounting bracket includes a bottom support plate, two hinged mounting seats, three telescopic support legs, a hinged main shaft, and a rotary positioning bolt; the bottom support plate is rotatably mounted at the bottom center of the explosion-proof housing through a bottom support main shaft, the two hinged mounting seats are arranged on the lower side of the bottom support plate, and the hinged main shaft is mounted on the two hinged mounting seats; an arc-shaped adjustment hole is provided around the hinged main shaft on each of the two hinged mounting seats, the ends of the two telescopic support legs are respectively swing-hinged at both ends of the hinged main shaft and locked on the arc-shaped adjustment hole through a tie bolt, and the end of the other telescopic support leg is swing-hinged at the middle of the hinged main shaft; the rotary positioning bolt is threadedly screwed through the bottom support plate, and the end of the screw rod of the rotary positioning bolt presses on the bottom of the explosion-proof housing.

[0016] The present invention also discloses a monitoring method for an electromagnetic radiation monitor for coal and rock dynamic disaster monitoring, including the following steps: Step 1, select each monitoring point in the mine according to the monitoring needs, and select the installation surface of the electromagnetic radiation monitoring terminal according to the installation environment at each monitoring point; Step 2, install the electromagnetic radiation monitoring terminal on the selected installation surface through the mounting bracket, and the distance between the upper side of the upper housing and the top surface of the monitoring point is greater than the distance threshold, and the distance between the lower side of the lower housing and the ground of the monitoring point is greater than the distance threshold. Then, adjust the levelness of the explosion-proof housing through the mounting bracket so that the upper side of the upper housing and the lower side of the lower housing are both in a horizontal state; Step 3, rotate and adjust the explosion-proof housing. Taking the center of the upper side of the explosion-proof housing as the coordinate origin, rotate the magnetic field sensors on the four side edges of the upper side of the explosion-proof housing to the four directions of due south, due north, due east, and due west, and then lock the rotation of the explosion-proof housing; Step 4, tilt and adjust the four magnetic field sensors on the upper housing upward to the upper side of the upper housing, and lock the tilt angles of the four upper magnetic field sensors by using the corresponding angle locking mechanism. Then, adjust the inner arc-shaped shielding blades and the outer arc-shaped shielding blades on the four upper magnetic field sensors so that the sides of the inner arc-shaped shielding blades and the outer arc-shaped shielding blades close to the upper side of the upper housing are shielded; Step 5, tilt and adjust the four magnetic field sensors on the lower housing downward to the lower side of the lower housing, and lock the tilt angles of the four lower magnetic field sensors by using the corresponding angle locking mechanism. Then, adjust the inner arc-shaped shielding blades and the outer arc-shaped shielding blades on the four lower magnetic field sensors so that the sides of the inner arc-shaped shielding blades and the outer arc-shaped shielding blades close to the lower side of the lower housing are shielded; Step 6, electrically connect the slave communication modules of each electromagnetic radiation monitoring terminal to the main communication module through each explosion-proof cable, and the main controller communicates with the remote control center through the router; Step 7: Use each electromagnetic shielding cover to surround and shield each electromagnetic radiation monitoring terminal, cut off the interference of the environmental magnetic field on the electromagnetic radiation monitoring terminal. Then, the main controller sends a calibration instruction to the slave communication module of each electromagnetic radiation monitoring terminal through the main communication module. After the slave controller obtains the calibration instruction, it generates a standard calibration signal through the signal generation circuit, and inputs the calibration signal into the signal processing circuit through the calibration signal input terminal. Then, the standard calibration signal is output from the feedback signal input terminal of the signal processing circuit to the feedback coil circuit to generate a calibration electromagnetic field. Next, the signal processing circuit amplifies the electromagnetic signal sensed by the detection coil circuit. Then, the high-speed data acquisition module acquires the amplified electromagnetic signal and uses the acquired electromagnetic signal as a calibration electromagnetic signal. Then, detach each electromagnetic shielding cover and stop the signal generation of the signal generation circuit; Step 8: The main controller continuously obtains the acquisition instruction from the remote control center. After the main controller obtains the acquisition instruction, it forwards the acquisition instruction to each slave communication module through the main communication module. After each slave controller receives the acquisition instruction, the signal processing circuit amplifies the actual electromagnetic signal sensed by the detection coil circuit. Then, the high-speed data acquisition module acquires the amplified actual electromagnetic signal. Then, the slave controller normalizes the acquired actual electromagnetic signal according to the calibration electromagnetic signal to obtain an actual output signal. Then, the actual output signal is sent to the main controller through the communication between the slave communication module and the main communication module. The main controller temporarily stores the actual output signal in the main memory, and then the main controller forwards the actual output signal in the main memory to the remote control center through the router.

[0017] Compared with the prior art, the beneficial effects of the present invention are as follows: The use of multiple electromagnetic radiation monitoring terminals can realize the acquisition of electromagnetic signals combined at multiple points in the mine, thereby providing reliable data support for coal and rock dynamic disasters; The use of the high-speed data acquisition module can realize the high-speed acquisition of the full waveform of electromagnetic signals; The use of the mounting bracket can fix the explosion-proof housing on the horizontal or vertical plane inside the mine, thereby meeting the installation requirements of different installation environments inside the mine; The use of each magnetic field sensor is installed on the explosion-proof housing in an angle-adjustable manner, thereby realizing the acquisition of magnetic field signals at different angles and meeting the acquisition requirements in different spatial environments inside the mine; The use of the signal generation circuit to send a standard calibration signal to each magnetic field sensor can calibrate the actual electromagnetic signal and ensure the reliability of the actual electromagnetic signal acquisition. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the system layout of the present invention; Figure 2 It is a schematic diagram of the structure of the electromagnetic radiation monitoring terminal of the present invention; Figure 3Schematic diagram of the partial structure of the electromagnetic radiation monitoring terminal of the present invention when installed horizontally; Figure 4 Schematic diagram of the partial structure of the electromagnetic radiation monitoring terminal of the present invention when installed vertically; Figure 5 Schematic diagram of the partial structure of the mounting bracket of the present invention; Figure 6 Schematic diagram of the sectional structure of the explosion-proof housing of the present invention; Figure 7 Schematic diagram of the sectional structure at the angle locking mechanism of the present invention; Figure 8 Schematic diagram of the sectional structure of the magnetic field sensor of the present invention; Figure 9 Schematic diagram of the connection circuit of each coil of the coil assembly of the present invention; Figure 10 Schematic diagram of the signal processing circuit of the present invention; Figure 11 Schematic diagram of the overall circuit of the present invention. Detailed implementation manners

[0019] The technical solution of the present invention will be described in detail below with reference to the accompanying drawings, but the protection scope of the present invention is not limited to the described embodiments.

[0020] As Figures 1-11 shown, the electromagnetic radiation monitor for coal and rock dynamic disaster monitoring disclosed by the present invention includes: a control cabinet 113 and a plurality of electromagnetic radiation monitoring terminals; the electromagnetic radiation monitoring terminals include an explosion-proof housing, a mounting bracket, and a plurality of magnetic field sensors; a slave controller, a slave memory, a signal generation circuit, a high-speed data acquisition module, and a slave communication module are arranged in the explosion-proof housing; each magnetic field sensor is installed on the upper side and the edge of the lower side of the explosion-proof housing in an angle-adjustable manner for multi-angle magnetic field detection; the mounting bracket is arranged at the center of the lower side of the explosion-proof housing for fixing the explosion-proof housing on mounting surfaces at different angles inside the mine; the slave controller is electrically connected to the slave memory, the signal generation circuit, the slave communication module, and the high-speed data acquisition module respectively, the high-speed data acquisition module and the signal generation circuit are both electrically connected to each magnetic field sensor, the high-speed data acquisition module collects data from each magnetic field sensor, and the signal generation circuit sends a standard calibration signal to each magnetic field sensor; the control cabinet 113 is arranged outside the mine and is provided with a master controller, a master memory, a router, and a master communication module; the master controller is electrically connected to the master memory, the router, and the master communication module respectively; the master communication module communicates with each slave communication module through explosion-proof cables respectively.

[0021] The use of multiple electromagnetic radiation monitoring terminals can achieve the acquisition of electromagnetic signals combined at multiple points in the mine, thereby providing reliable data support for coal and rock dynamic disasters; the use of a high-speed data acquisition module can achieve high-speed full-waveform acquisition of electromagnetic signals; the use of a mounting bracket can fix the explosion-proof housing on the horizontal or vertical plane inside the mine, thereby meeting the installation needs of different installation environments inside the mine; the use of each magnetic field sensor is installed on the explosion-proof housing in an angle-adjustable manner, thereby achieving magnetic field signal acquisition at different angles and meeting the acquisition needs in different spatial environments inside the mine; the use of a signal generation circuit to send a standard calibration signal to each magnetic field sensor, thereby being able to calibrate the actual electromagnetic signal and ensuring the reliability of the actual electromagnetic signal acquisition.

[0022] Furthermore, the main technical indicators of the high-speed data acquisition module are: (1) The continuous sampling rate can reach 200M / s; (2) 16-bit resolution, 0.1% accuracy; (3) 1 ppm time base accuracy.

[0023] Furthermore, the signal generation circuit includes a digital-to-analog conversion circuit and an operational amplifier circuit. The digital signal sent from the controller is converted into an analog signal by the digital-to-analog conversion circuit, and then the generated analog signal is amplified by the operational amplifier circuit, and the amplified signal is used as the standard calibration signal.

[0024] Furthermore, as Figures 2-4 shown, the explosion-proof housing includes an upper housing 18 and a lower housing 1, and the upper housing 18 and the lower housing 1 are detachably assembled; a hinged mounting groove 3 is provided in the middle of the four edges of the upper side of the upper housing 18 and the middle of the four edges of the lower side of the lower housing 1; a sensor mounting seat 19 is swingably hinged on the hinged mounting groove 3, and the swing angle of the end of the hinge shaft 21 on one side of the sensor mounting seat 19 is locked by an angle locking mechanism; the magnetic field sensor is fixedly installed on the sensor mounting seat 19. By using the sensor mounting seat 19 for hinged installation, the pitching angle of the magnetic field sensor can be adjusted, and the swing angle is locked by the angle locking mechanism.

[0025] Furthermore, the other side of the sensor mounting seat 19 is a hinged pipe shaft 20 for passing through the electrical connection cable of the magnetic field sensor, and the electrical connection cable is an explosion-proof cable.

[0026] Furthermore, flange edges 2 are provided on the lower side of the upper housing 18 and the upper side of the lower housing 1, and the upper and lower flange edges 2 are detachably assembled by tie bolts.

[0027] Furthermore, as Figure 7As shown in the figure, the angle locking mechanism includes a telescopic insert 25, a resilient compression spring 29, and a locking disc 23. A locking cavity 22 is provided at the end of the hinge shaft 21, and the locking disc 23 is fixed to the end of the hinge shaft 21. The end of the telescopic insert 25 is movably inserted into the locking cavity 22, and the other end extends out of the explosion-proof housing. An angle locking seat 24 is provided at the insertion end of the telescopic insert 25, and an arc-shaped groove 30 that cooperates with the circumferential surface of the locking disc 23 is provided on the angle locking seat 24. Limiting protrusions that are mutually engaged are provided on the circumferential surface of the locking disc 23 and the inner wall of the arc-shaped groove 30. A spring installation groove 28 is provided on the angle locking seat 24. One end of the resilient compression spring 29 is supported on the bottom of the locking cavity 22, and the other end is supported in the spring installation groove 28, and is used to push the locking disc 23 to fit the arc-shaped groove 30. A T-shaped guiding chute 26 is provided on the side of the telescopic insert 25 along the supporting direction of the resilient compression spring 29, and a T-shaped guiding slider 27 that is slidably inserted into the T-shaped guiding chute 26 is provided on the inner wall of the locking cavity 22. By using the cooperation between the locking disc 23 and the arc-shaped groove 30, the limiting protrusions can be fully engaged, and under the action of the resilient compression spring 29, the stability of the angle locking can be ensured. By using the cooperation between the T-shaped guiding chute 26 and the T-shaped guiding slider 27, the limiting and guiding of the telescopic insert 25 can be realized.

[0028] Further, as Figure 7 and 8As shown in the figure, the magnetic field sensor includes a coil assembly, a magnetic core, an internal circuit board 65, an explosion-proof housing, an inner arc-shaped shielding blade 47, and an outer arc-shaped shielding blade 48; the magnetic core is fixed inside the coil assembly, and the magnetic core is composed of multiple thin magnetic cores bundled and fixed, and the material of the magnetic core is selected as manganese-zinc ferrite material; a coil fixing cavity 53 and a circuit fixing cavity 64 are arranged inside the explosion-proof housing; the coil assembly is detachably installed in the coil fixing cavity 53; the internal circuit board 65 is detachably installed in the circuit fixing cavity 64, and a signal processing circuit electrically connected to the coil assembly is arranged on the internal circuit board 65, and the signal processing circuit is electrically connected to a high-speed data acquisition module and a signal generation circuit respectively; the end of the explosion-proof housing is fixed on the sensor mounting seat 19 through a mounting connection column 50; two blade support rings 45 are rotatably installed on the mounting connection column 50; the ends of the inner arc-shaped shielding blade 47 and the outer arc-shaped shielding blade 48 are respectively connected and fixed to the two blade support rings 45 through connection support bars 46, and the inner arc-shaped shielding blade 47 and the outer arc-shaped shielding blade 48 are both located around the explosion-proof housing in a partial surrounding manner. By using the inner arc-shaped shielding blade 47 and the outer arc-shaped shielding blade 48 to be located around the explosion-proof housing in a partial surrounding manner, the magnetic field sensing angle range of each magnetic field sensor can be adjusted according to the on-site installation needs, and the aliasing of electromagnetic signal acquisition of each magnetic field sensor can be reduced; by using the explosion-proof housing, the coil assembly and the internal circuit board 65 can be sealed and explosion-proof, ensuring the use safety inside the mine.

[0029] Furthermore, the explosion-proof housing includes a cylindrical shell 49 and two end caps 51; end-threaded holes are arranged at the upper and lower ends of the cylindrical shell 49, and the two end-threaded holes are respectively communicated with the coil fixing cavity 53 and the circuit fixing cavity 64; threaded bosses 52 are arranged on the two end caps 51, and the two threaded bosses 52 are respectively screwed and installed on the two end-threaded holes to achieve detachable installation; the mounting connection column 50 is fixed on the lower end cap 51.

[0030] Furthermore, as Figure 8 and 9As shown, the coil assembly includes a bobbin 54, three middle induction coils 62, two end induction coils 60, six feedback coils 61, and two ground coils 57; the magnetic core is coaxially and fixedly arranged inside the bobbin 54; six first annular grooves 58, three second annular grooves 59, and two third annular grooves 63 are arranged on the outer wall of the middle part of the bobbin 54. The three second annular grooves 59 and the two third annular grooves 63 are respectively located in five interval areas between the six first annular grooves 58. The three second annular grooves 59 are located between the two third annular grooves 63. The distance between adjacent first annular grooves 58 and second annular grooves 59 is equal to the distance between adjacent first annular grooves 58 and third annular grooves 63; one fourth annular groove 55 is arranged on the outer wall at both ends of the bobbin 54; the two ground coils 57 are respectively located in the two fourth annular grooves 55 and are both electrically connected to the ground input end of the signal processing circuit; the three middle induction coils 62 are respectively located in the three second annular grooves 59, the two end induction coils 60 are respectively located in the two third annular grooves 63, and the six feedback coils 61 are respectively located in the six first annular grooves 58; the six feedback coils 61 are connected in sequence to form a feedback coil circuit, and one end of the feedback coil circuit is electrically connected to the ground coil 57, and the other end is electrically connected to the feedback signal input end of the signal processing circuit; the three middle induction coils 62 and the two end induction coils 60 are connected in sequence according to their positions to form a detection coil circuit, and one end of the detection coil circuit is electrically connected to one end of the ground coil 57, and the other end is electrically connected to the electromagnetic signal input end of the signal processing circuit; the other end of the ground coil 57 is electrically connected to the ground input end of the signal processing circuit; the signal processing circuit is used to amplify the electromagnetic signal at the electromagnetic signal input end and feedback the amplified electromagnetic signal to the feedback signal input end; the signal processing circuit is provided with an electromagnetic signal output end for outputting the amplified electromagnetic signal, and the electromagnetic signal output end is electrically connected to the signal acquisition end of the high-speed data acquisition module; the signal processing circuit is also provided with a calibration signal input end electrically connected to the feedback signal input end, and the calibration signal input end is electrically connected to the signal generation circuit. By using the first annular groove 58, the second annular groove 59, the third annular groove 63, and the fourth annular groove 55, it is convenient to respectively position and wind the feedback coil 61, the middle induction coil 62, the end induction coil 60, and the ground coil 57, thereby ensuring the stability of each coil and also ensuring the uniform distribution characteristics of the coil winding; by using the six feedback coils 61 to form a feedback coil circuit, on the one hand, the amplified actual electromagnetic signal can be fed back, so that the detection coil circuit can obtain a more stable and reliable actual electromagnetic signal. On the other hand, it is also convenient for the signal generation circuit to input a standard calibration signal to generate a calibration electromagnetic field, and finally collect and obtain a calibrated electromagnetic signal, which is convenient for completing the normalization processing of the actual electromagnetic signal; by arranging the three middle induction coils 62 between the two end induction coils 60, the magnetic field induction and collection at the middle position with stronger signal intensity can be better performed.

[0031] Further, as Figure 10As shown, the signal processing circuit includes a terminal block P1, a preamplifier U1, a constant current source chip U4, a first operational amplifier U2, a second operational amplifier U3, resistors R3, R4, R5, R6, R7, R8, R9, R10, R11, R12, R13, R14, R16, R19, R21, R24, R25, R28, R29, capacitors C3, C6, C7, C8, C9, C10, C12, and a diode D6; the preamplifier U1 uses a JFE2140 model chip, the constant current source chip U4 uses an LM234DT model chip, and both the first operational amplifier U2 and the second operational amplifier U3 use an LT1354CS8 model chip; the 1st pin of the terminal block P1 serves as the electromagnetic signal input terminal of the signal processing circuit, the 2nd pin of the terminal block P1 serves as the ground input terminal of the signal processing circuit, and the 3rd pin of the terminal block P1 serves as the feedback signal input terminal of the signal processing circuit; the electromagnetic signal input terminal is electrically connected to one end of the resistor R13 and the G1 pin of the preamplifier U1 respectively, the ground input terminal is electrically connected to the other end of the resistor R13 and then grounded, and the feedback signal input terminal is electrically connected to one end of the resistor R21, one end of the resistor R19, and one end of the resistor R28 respectively; the other end of the resistor R28 is electrically connected to one end of the resistor R29 and serves as the calibration signal input terminal, and the other end of the resistor R29 is grounded; the other end of the resistor R21 is electrically connected to one end of the capacitor C12, and the other end of the capacitor C12 is electrically connected to the other end of the resistor R19, one end of the capacitor C8, one end of the resistor R12, the output terminal of the first operational amplifier U2, and one end of the capacitor C7 respectively; the negative terminal of the diode D6 is electrically connected to one end of the resistor R25 and then connected to the negative voltage source VEE, the positive terminal of the diode D6 is electrically connected to the V- pin of the constant current source chip U4 and one end of the resistor R24 respectively, and the other end of the resistor R24 is electrically connected to the other end of the resistor R25 and the ADJ pin of the constant current source chip U4 respectively; the V+ pin of the constant current source chip U4 is electrically connected to the S1 pin and the S2 pin of the preamplifier U1 respectively; the VCL pin of the preamplifier U1 is connected to the negative voltage source VEE, the G2 pin of the preamplifier U1 is electrically connected to one end of the resistor R14, the other end of the capacitor C8, and the other end of the resistor R12 respectively, and the other end of the resistor R14 is grounded; the VCH pin of the preamplifier U1 is connected to the positive voltage source VCC, the D1 pin of the preamplifier U1 is electrically connected to one end of the resistor R3, one end of the resistor R6, and one end of the resistor R7 respectively, and the D2 pin of the preamplifier U1 is electrically connected to one end of the resistor R10, one end of the capacitor C6, and one end of the resistor R4 respectively; the other end of the resistor R3 is electrically connected to the other end of the resistor R4 and then connected to the positive voltage source VCC; the other end of the resistor R6 is electrically connected to the other end of the capacitor C6;The other end of resistor R7 is electrically connected to the negative input terminal of the first operational amplifier U2, and the other end of resistor R10 is electrically connected to the positive input terminal of the first operational amplifier U2; the other end of capacitor C7 is electrically connected to one end of resistor R8, and the other end of resistor R8 is respectively electrically connected to the negative input terminal of the second operational amplifier U3, one end of capacitor C3, and one end of resistor R5. The other end of capacitor C3 is respectively electrically connected to one end of resistor R9, the output terminal of the second operational amplifier U3, and the other end of resistor R5; the other end of resistor R9 serves as the electromagnetic signal output terminal of the signal processing circuit; the positive input terminal of the second operational amplifier U3 is respectively electrically connected to one end of resistor R11, one end of capacitor C9, and one end of resistor R16. After the other end of capacitor C9 and the other end of resistor R16 are electrically connected, they are grounded; the other end of resistor R11 is electrically connected to one end of capacitor C10, and the other end of capacitor C10 is grounded.

[0032] Further, rubber rings 56 are sleeved on the outer walls at both ends of the bobbin 54, and the rubber rings 56 are tightly attached to the inner wall of the coil fixing cavity 53, so as to realize the stable installation of the bobbin 54 in the coil fixing cavity 53.

[0033] Further, as Figure 8 shown, the groove width of the fourth ring groove 55 is smaller than that of the first ring groove 58, the groove width of the first ring groove 58 is smaller than that of the third ring groove 63, and the groove width of the third ring groove 63 is smaller than that of the second ring groove 59; the middle induction coil 62 has forty turns and is arranged in a single layer and flatly wound in the second ring groove 59; the end induction coil 60 has twenty turns and is arranged in a single layer and flatly wound in the third ring groove 63; the feedback coil 61 has two turns and is arranged in a single layer and flatly wound in the first ring groove 58; the ground wire coil 57 has one turn and is wound in the fourth ring groove 55. The three middle induction coils 62 are all set to have forty turns and are arranged in a single layer and flatly wound, so that there are more dense coils at the position with a stronger middle magnetic field, ensuring the magnetic field induction effect.

[0034] Further, as Figure 6As shown in the figure, a ventilation window 31 is vertically and penetratingly arranged in the middle of the upper shell 18, and a heat dissipation channel opposite to the ventilation window 31 is vertically arranged in the middle of the lower shell 1; a middle platform 33 is horizontally arranged at the lower end of the heat dissipation channel through a radial support pipe 34, the mounting bracket is arranged on the lower side surface of the middle platform 33, and an electrical control box 35 is arranged on the upper side surface of the middle platform 33; a slave control circuit board 40 and a driving motor 36 are arranged in the electrical control box 35, the slave controller, the slave memory and the slave communication module are all arranged on the slave control circuit board 40, and a temperature sensor and a heat dissipation driving circuit electrically connected to the slave controller are arranged on the slave control circuit board 40; a transmission shaft is rotatably mounted through the center of the top of the electrical control box 35, and a plurality of cantilever rods 37 are horizontally fixed at the upper end of the transmission shaft. Heat dissipation suspension rods are vertically arranged below the cantilever ends of each cantilever rod 37, a heat dissipation scraping blade 39 is obliquely arranged at the lower end of the heat dissipation suspension rod, and each heat dissipation scraping blade 39 is at a different height; the heat dissipation driving circuit is electrically connected to the driving motor 36, and the driving motor 36 is used for driving the transmission shaft to rotate; a plurality of heat dissipation blocks are fixedly arranged on the circumferential side wall of the electrical control box 35, and the heat dissipation thin sheets 38 of each heat dissipation block horizontally extend out of the electrical control box 35 to form an annular heat dissipation area at different heights outside the electrical control box 35, and each heat dissipation scraping blade 39 horizontally moves in the annular heat dissipation area at different height positions; the heat dissipation scraping blade 39 is made of a non-metallic material, such as plastic; an annular heat conduction flat tube 42 is arranged in the electrical control box 35, and the annular heat conduction flat tube 42 is attached to the heat dissipation block through a heat conduction layer; a chip heat dissipation strip 41 extending to the slave control circuit board 40 and a motor heat dissipation strip 43 extending to the driving motor 36 are fixedly connected to the annular heat conduction flat tube 42, and an arc-shaped heat conduction plate 44 attached to the side wall of the driving motor 36 is arranged at the end of the motor heat dissipation strip 43. By docking the heat dissipation channel with the ventilation window 31 and horizontally extending the heat dissipation thin sheets 38 of each heat dissipation block to form an annular heat dissipation area at different heights in the heat dissipation channel, rapid heat dissipation is realized under the action of the heat dissipation scraping blade 39, and the reliability of high-speed signal acquisition is ensured; each heat dissipation scraping blade 39 at different heights can push the air flow in the heat dissipation channel to dissipate heat during rotation, and each heat dissipation scraping blade 39 can also scrape and clean the heat dissipation thin sheets 38 of each heat dissipation block, so as to avoid too much dust accumulating on the heat dissipation thin sheets 38 in the mine environment and ensure the heat dissipation effect; the heat dissipation driving circuit and the driving motor 36 are both arranged in the electrical control box 35, so that the explosion-proof function can be achieved; by arranging the annular heat conduction flat tube 42, the chip heat dissipation strip 41, the motor heat dissipation strip 43 and the arc-shaped heat conduction plate 44, precise heat dissipation of corresponding electrical appliances can be realized, and the safe operation of the electromagnetic radiation monitoring terminal is ensured.

[0035] Further, a protective net 32 is arranged at the upper opening of the ventilation window 31 to provide safety protection for the cantilever rod 37 and ensure safety during operation.

[0036] Further, as Figures 2-5 shown, the mounting bracket includes a bottom support plate 5, two hinged mounting seats 6, three telescopic support legs, a hinged main shaft 17, and a rotary positioning bolt 9; the bottom support plate 5 is rotatably mounted at the bottom center of the explosion-proof housing through a bottom support main shaft 8, and the two hinged mounting seats 6 are arranged on the lower side surface of the bottom support plate 5, and the hinged main shaft 17 is mounted on the two hinged mounting seats 6; an arc-shaped adjustment hole 7 is arranged around the hinged main shaft 17 on each of the two hinged mounting seats 6, the end parts of the two telescopic support legs are respectively swing-hinged at both ends of the hinged main shaft 17, and are locked in the arc-shaped adjustment hole 7 through a tie bolt 11, and the end part of the other telescopic support leg is swing-hinged at the middle part of the hinged main shaft 17; the rotary positioning bolt 9 is threadedly screwed through the bottom support plate 5, and the end of the screw rod of the rotary positioning bolt 9 presses on the bottom of the explosion-proof housing. The three telescopic support legs can be telescopically adjusted according to the on-site installation requirements to meet the support requirements at different angles; the rotary positioning bolt 9 can be used to realize the rotary positioning of the bottom support plate 5, so as to realize the horizontal orientation angle adjustment of the electromagnetic radiation monitoring terminal; the cooperation of the arc-shaped adjustment hole 7 and the tie bolt 11 can realize the swing positioning of the two telescopic support legs, so as to ensure the stability of the electromagnetic radiation monitoring terminal after installation.

[0037] Further, the telescopic support leg includes a hinged swing rod 10, a telescopic adjustment screw rod 12, a telescopic adjustment internal threaded tube 13, and a fixed installation floor 16; one end of the hinged swing rod 10 is swing-hinged on the hinged main shaft 17, and the other end is butted against one end of the telescopic adjustment screw rod 12; the other end of the telescopic adjustment screw rod 12 is threadedly screwed into the one end pipe orifice of the telescopic adjustment internal threaded tube 13; a fixed installation waist-shaped hole is arranged at the edge of the fixed installation floor 16, a spherical hinge seat 15 is arranged in the middle of the fixed installation floor 16, and a hinge ball head 14 matched with the spherical hinge seat 15 is arranged at the other end of the telescopic adjustment internal threaded tube 13; the tie bolt 11 passes through the middle of the hinged swing rod 10, and presses and fixes the middle of the hinged swing rod 10 at the arc-shaped adjustment hole 7. The fixed installation floor 16 can be used to realize the positioning and fixed installation of the lower end of the telescopic support leg; the cooperation of the spherical hinge seat 15 and the hinge ball head 14 can meet the different angle requirements at the installation position.

[0038] The monitoring method of the electromagnetic radiation monitor for coal and rock dynamic disaster monitoring disclosed by the present invention includes the following steps: Step 1, select each monitoring point in the mine according to the monitoring needs, and select the installation surface of the electromagnetic radiation monitoring terminal according to the installation environment at each monitoring point; Step 2: Install the three fixedly-mounted floors 16 on the installation surface at the selected monitoring point, and ensure that the distance between the upper side of the upper housing 18 and the top surface of the monitoring point is greater than the distance threshold, and the distance between the lower side of the lower housing 1 and the ground of the monitoring point is greater than the distance threshold. The distance threshold is set to 50 cm. Then, adjust the telescopic length of the telescopic adjusting screw 12 to complete the leveling adjustment of the explosion-proof housing, so that the upper side of the upper housing 18 and the lower side of the lower housing 1 are both in a horizontal state; Step 3: Rotate and adjust the explosion-proof housing. Taking the center of the upper side of the explosion-proof housing as the coordinate origin, rotate the magnetic field sensors on the four side edges of the upper side of the explosion-proof housing to the four directions of due south, due north, due east, and due west, and lock the rotation of the explosion-proof housing by rotating the positioning bolt 9. The installation on the horizontal plane is as Figure 3 shown, and the installation on the vertical plane is as Figure 5 shown; Step 4: Adjust the four magnetic field sensors on the upper housing 18 to be inclined upward above the upper side of the upper housing 18, so that the central axis of the winding tube 54 forms an angle of 45° - 75° with the upper side of the upper housing 18, and use the corresponding angle locking mechanism to lock the inclination angles of the four upper magnetic field sensors. Then, adjust the inner arc-shaped shielding blades 47 and the outer arc-shaped shielding blades 48 on the four upper magnetic field sensors, so that the angle range of the shielding interval formed by the inner arc-shaped shielding blades 47 and the outer arc-shaped shielding blades 48 around the circumference of the coil assembly is 210° - 240°, and the inner arc-shaped shielding blades 47 and the outer arc-shaped shielding blades 48 perform shielding on the side close to the upper side of the upper housing 18, so that the four upper magnetic field sensors detect the magnetic field in the upper space, and the detection areas of the magnetic field sensors overlap as little as possible within a small range. This adjustment can be completed according to the experience of the installer, and it is not necessary to achieve precise angle measurement, nor is it necessary to make the detection ranges completely non-overlapping; Step 5: Adjust the four magnetic field sensors on the lower housing 1 to incline downward to the lower side of the lower surface of the lower housing 1, so that the central axis of the solenoid 54 forms an angle of 45° to 75° with the lower surface of the lower housing 1. Use the corresponding angle locking mechanism to lock the inclination angles of the four magnetic field sensors on the lower side. Then, adjust the inner arc shielding blades 47 and the outer arc shielding blades 48 on the four magnetic field sensors on the lower side, so that the angle range of the shielding interval formed by the inner arc shielding blades 47 and the outer arc shielding blades 48 around the circumference of the coil assembly is 210° to 240°, and the inner arc shielding blades 47 and the outer arc shielding blades 48 perform shielding on the side close to the lower surface of the lower housing 1, so that the four magnetic field sensors at the lower part detect the magnetic field in the lower layer space, and the detection areas of the respective magnetic field sensors overlap as little as possible within a relatively small range. This adjustment can be completed according to the experience of the installer, and it is not necessary to achieve precise angle measurement, nor is it necessary to make the detection ranges completely non-overlapping; Step 6: Electrically connect the slave communication modules of the respective electromagnetic radiation monitoring terminals to the master communication module of the control cabinet 113 with respective explosion-proof cables. The main controller of the control cabinet 113 communicates with the remote control center through a router; Step 7: Use the respective electromagnetic shielding covers to surround and shield the respective electromagnetic radiation monitoring terminals to isolate the interference of the ambient magnetic field on the electromagnetic radiation monitoring terminals. Then, the main controller of the control cabinet 113 sends a calibration instruction to the slave communication modules of the respective electromagnetic radiation monitoring terminals through the master communication module. After the slave controller obtains the calibration instruction, it generates a standard calibration signal through the signal generation circuit, and inputs the calibration signal into the signal processing circuit through the calibration signal input terminal. Then, the standard calibration signal is output from the feedback signal input terminal of the signal processing circuit to the feedback coil circuit to generate a calibration electromagnetic field. Then, the signal processing circuit amplifies the electromagnetic signal sensed by the detection coil circuit. Then, the high-speed data acquisition module acquires the amplified electromagnetic signal and uses the acquired electromagnetic signal as a calibration electromagnetic signal. Then, disassemble the respective electromagnetic shielding covers and stop the signal generation of the signal generation circuit; Step 8: The main controller of the control cabinet 113 obtains the acquisition instruction of the remote control center in real time. After the main controller obtains the acquisition instruction, it forwards the acquisition instruction to each slave communication module through the main communication module. After each slave controller receives the acquisition instruction, the signal processing circuit amplifies the actual electromagnetic signal sensed by the detection coil circuit, and then the high-speed data acquisition module acquires the amplified actual electromagnetic signal. Then, the slave controller normalizes the acquired actual electromagnetic signal according to the calibrated electromagnetic signal to obtain the actual output signal, and then sends the actual output signal to the main controller through the communication between the slave communication module and the main communication module. The main controller temporarily stores the actual output signal in the main memory, and then the main controller forwards the actual output signal in the main memory to the remote control center through the router, facilitating the monitoring personnel to analyze the acquired data.

[0039] During the operation of the electromagnetic radiation monitoring terminal, when the temperature sensor collects that the temperature inside the explosion-proof housing exceeds the set threshold, the slave controller rotates the drive motor 36 through the heat dissipation drive circuit, and uses each heat dissipation blade 39 to dissipate heat and remove dust from each heat dissipation fin 38, so as to quickly cool down the inside of the electrical control box 35, thereby ensuring the stable and safe operation of the electrical equipment inside the electrical control box 35.

[0040] As described above, although the present invention has been shown and described with reference to specific preferred embodiments, it should not be construed as a limitation of the present invention itself. Various changes can be made in its form and details without departing from the spirit and scope of the present invention defined by the appended claims.

Claims

1. An electromagnetic radiation monitor for monitoring coal and rock dynamic disasters, characterized in that: It includes a control cabinet (113) and multiple electromagnetic radiation monitoring terminals; the electromagnetic radiation monitoring terminals include explosion-proof shells, mounting brackets, and multiple magnetic field sensors; inside the explosion-proof shell, a slave controller, a slave memory, a signal generation circuit, a high-speed data acquisition module, and a slave communication module are provided; each magnetic field sensor is installed on the upper side and the edge of the lower side of the explosion-proof shell in an angle-adjustable manner for multi-angle magnetic field detection; the mounting bracket is arranged at the center of the lower side of the explosion-proof shell for fixing the explosion-proof shell on the mounting surface inside the mine; the slave controller is electrically connected to the slave memory, the signal generation circuit, the slave communication module, and the high-speed data acquisition module respectively, and both the high-speed data acquisition module and the signal generation circuit are electrically connected to each magnetic field sensor. The high-speed data acquisition module collects data from each magnetic field sensor, and the signal generation circuit sends a standard calibration signal to each magnetic field sensor; the control cabinet (113) is arranged outside the mine and is provided with a master controller, a master memory, a router, and a master communication module; the master controller is electrically connected to the master memory, the router, and the master communication module respectively; the master communication module is communicatively connected to each slave communication module through explosion-proof cables.

2. The electromagnetic radiation monitor for coal and rock dynamic disaster monitoring according to claim 1, characterized in that: The explosion-proof shell includes an upper shell (18) and a lower shell (1), and the upper shell (18) and the lower shell (1) are detachably assembled; at the middle of the four edges of the upper side of the upper shell (18) and at the middle of the four edges of the lower side of the lower shell (1), a hinge mounting groove (3) is provided; a sensor mounting seat (19) is swingably hinged on the hinge mounting groove (3) in a pitching manner, and the end of the hinge shaft (21) on one side of the sensor mounting seat (19) is locked in terms of the swinging angle through an angle locking mechanism; the magnetic field sensor is fixedly installed on the sensor mounting seat (19).

3. The electromagnetic radiation monitor for coal and rock dynamic disaster monitoring according to claim 2, characterized in that: The angle locking mechanism includes a telescopic insertion bar (25), a resilient compression spring (29), and a locking disc (23); a locking cavity (22) is provided at the end of the hinge shaft (21), and the locking disc (23) is fixed on the end of the hinge shaft (21); the end of the telescopic insertion bar (25) is movably inserted into the locking cavity (22), and the other end extends out of the explosion-proof shell; an angle locking seat (24) is provided on the insertion end of the telescopic insertion bar (25), and an arc-shaped groove (30) that matches the circumferential surface of the locking disc (23) is provided on the angle locking seat (24); on the circumferential surface of the locking disc (23) and on the inner wall of the arc-shaped groove (30), there are engaged limit ridges; the resilient compression spring (29) is installed in the locking cavity (22) for pushing the locking disc (23) to fit the arc-shaped groove (30).

4. The electromagnetic radiation monitor for coal and rock dynamic disaster monitoring according to claim 2, characterized in that: The magnetic field sensor includes a coil assembly, a magnetic core, a built-in circuit board (65), an explosion-proof housing, an inner arc-shaped shielding blade (47) and an outer arc-shaped shielding blade (48); the magnetic core is fixed inside the coil assembly; a coil fixing cavity (53) and a circuit fixing cavity (64) are arranged inside the explosion-proof housing; the coil assembly is detachably installed in the coil fixing cavity (53); the built-in circuit board (65) is detachably installed in the circuit fixing cavity (64), and a signal processing circuit electrically connected to the coil assembly is arranged on the built-in circuit board (65), and the signal processing circuit is electrically connected to a high-speed data acquisition module and a signal generating circuit respectively; the end of the explosion-proof housing is fixed on a sensor mounting base (19) through a mounting connection column (50); two blade support rings (45) are rotatably installed on the mounting connection column (50); the end parts of the inner arc-shaped shielding blade (47) and the outer arc-shaped shielding blade (48) are respectively connected and fixed to the two blade support rings (45) through connection support bars (46), and the inner arc-shaped shielding blade (47) and the outer arc-shaped shielding blade (48) are both located around the periphery of the explosion-proof housing in a partially surrounding manner.

5. The electromagnetic radiation monitor for coal and rock dynamic disaster monitoring according to claim 4, characterized in that: The coil assembly includes a bobbin (54), three middle induction coils (62), two end induction coils (60), six feedback coils (61) and two ground wires coils (57); the magnetic core is coaxially fixed inside the bobbin (54); six first annular grooves (58), three second annular grooves (59) and two third annular grooves (63) are arranged on the outer wall of the middle part of the bobbin (54), the three second annular grooves (59) and the two third annular grooves (63) are respectively located in five interval ranges between the six first annular grooves (58), the three second annular grooves (59) are located between the two third annular grooves (63), and the distance between adjacent first annular grooves (58) and second annular grooves (59) is equal to the distance between adjacent first annular grooves (58) and third annular grooves (63); one fourth annular groove (55) is arranged on the outer wall of each end of the bobbin (54); the two ground wires coils (57) are respectively located in the two fourth annular grooves (55), and are both electrically connected to the ground input end of the signal processing circuit; Three middle induction coils (62) are respectively located in three second annular grooves (59), two end induction coils (60) are respectively located in two third annular grooves (63), and six feedback coils (61) are respectively located in six first annular grooves (58); the six feedback coils (61) are connected in sequence to form a feedback coil circuit, and one end of the feedback coil circuit is electrically connected to the ground wire coil (57), and the other end is electrically connected to the feedback signal input end of the signal processing circuit; the three middle induction coils (62) and the two end induction coils (60) are connected in sequence according to their positions to form a detection coil circuit, and one end of the detection coil circuit is electrically connected to one end of the ground wire coil (57), and the other end is electrically connected to the electromagnetic signal input end of the signal processing circuit; the other end of the ground wire coil (57) is electrically connected to the ground input end of the signal processing circuit; the signal processing circuit is used for amplifying the electromagnetic signal at the electromagnetic signal input end and feeding back the amplified electromagnetic signal to the feedback signal input end; the signal processing circuit is provided with an electromagnetic signal output end for outputting the amplified electromagnetic signal, and the electromagnetic signal output end is electrically connected to the signal acquisition end of the high-speed data acquisition module; the signal processing circuit is further provided with a calibration signal input end electrically connected to the feedback signal input end, and the calibration signal input end is electrically connected to the signal generation circuit.

6. The electromagnetic radiation monitor for coal and rock dynamic disaster monitoring according to claim 5, characterized in that: The groove width of the fourth annular groove (55) is smaller than that of the first annular groove (58), the groove width of the first annular groove (58) is smaller than that of the third annular groove (63), and the groove width of the third annular groove (63) is smaller than that of the second annular groove (59); the middle induction coil (62) has forty turns and is wound in a single layer and laid flat in the second annular groove (59); the end induction coil (60) has twenty turns and is wound in a single layer and laid flat in the third annular groove (63); the feedback coil (61) has two turns and is wound in a single layer and laid flat in the first annular groove (58); the ground wire coil (57) has one turn and is wound in the fourth annular groove (55).

7. The electromagnetic radiation monitor for coal and rock dynamic disaster monitoring according to claim 5, characterized in that: The signal processing circuit includes a terminal P1, a preamplifier U1, a constant current source chip U4, a first operational amplifier U2, a second operational amplifier U3, resistors R3, R4, R5, R6, R7, R8, R9, R10, R11, R12, R13, R14, R16, R19, R21, R24, R25, R28, R29, capacitors C3, C6, C7, C8, C9, C10, C12, and a diode D6; the electromagnetic signal input terminal of the terminal P1 is electrically connected to one end of the resistor R13 and the G1 introduction of the preamplifier U1 respectively, the ground input terminal of the terminal P1 is grounded after being electrically connected to the other end of the resistor R13, and the feedback signal input terminal of the terminal P1 is electrically connected to one end of the resistor R21, one end of the resistor R19, and one end of the resistor R28 respectively; the other end of the resistor R28 is electrically connected to one end of the resistor R29 to serve as a calibration signal input terminal, and the other end of the resistor R29 is grounded; the other end of the resistor R21 is electrically connected to one end of the capacitor C12, and the other end of the capacitor C12 is electrically connected to the other end of the resistor R19, one end of the capacitor C8, one end of the resistor R12, the output terminal of the first operational amplifier U2, and one end of the capacitor C7 respectively; the negative terminal of the diode D6 is electrically connected to one end of the resistor R25 and then electrically connected to the negative voltage source VEE, the positive terminal of the diode D6 is electrically connected to the V- pin of the constant current source chip U4 and one end of the resistor R24 respectively, and the other end of the resistor R24 is electrically connected to the other end of the resistor R25 and the ADJ pin of the constant current source chip U4 respectively; the V+ pin of the constant current source chip U4 is electrically connected to the S1 pin and the S2 pin of the preamplifier U1 respectively; the VCL pin of the preamplifier U1 is electrically connected to the negative voltage source VEE, the G2 pin of the preamplifier U1 is electrically connected to one end of the resistor R14, the other end of the capacitor C8, and the other end of the resistor R12 respectively, and the other end of the resistor R14 is grounded; the VCH pin of the preamplifier U1 is electrically connected to the positive voltage source VCC, the D1 pin of the preamplifier U1 is electrically connected to one end of the resistor R3, one end of the resistor R6, and one end of the resistor R7 respectively, and the D2 pin of the preamplifier U1 is electrically connected to one end of the resistor R10, one end of the capacitor C6, and one end of the resistor R4 respectively; the other end of the resistor R3 is electrically connected to the other end of the resistor R4 and then electrically connected to the positive voltage source VCC; the other end of the resistor R6 is electrically connected to the other end of the capacitor C6; the other end of the resistor R7 is electrically connected to the negative input terminal of the first operational amplifier U2, and the other end of the resistor R10 is electrically connected to the positive input terminal of the first operational amplifier U2;The other end of the capacitor C7 is electrically connected to one end of the resistor R8. The other end of the resistor R8 is electrically connected to the negative input terminal of the second operational amplifier U3, one end of the capacitor C3, and one end of the resistor R5 respectively. The other end of the capacitor C3 is electrically connected to one end of the resistor R9, the output terminal of the second operational amplifier U3, and the other end of the resistor R5 respectively. The other end of the resistor R9 serves as the electromagnetic signal output terminal of the signal processing circuit. The positive input terminal of the second operational amplifier U3 is electrically connected to one end of the resistor R11, one end of the capacitor C9, and one end of the resistor R16 respectively. After the other ends of the capacitor C9 and the resistor R16 are electrically connected, they are grounded. The other end of the resistor R11 is electrically connected to one end of the capacitor C10, and the other end of the capacitor C10 is grounded.

8. The electromagnetic radiation monitor for coal and rock dynamic disaster monitoring according to claim 2, characterized in that: A ventilation window (31) is vertically and penetratingly arranged in the middle of the upper shell (18), and a heat dissipation channel opposite to the ventilation window (31) is vertically arranged in the middle of the lower shell (1); a middle platform (33) is horizontally arranged at the lower end of the heat dissipation channel through a radial support pipe (34), the mounting bracket is arranged on the lower side surface of the middle platform (33), and an electrical control box (35) is arranged on the upper side surface of the middle platform (33); a slave control circuit board (40) and a driving motor (36) are arranged in the electrical control box (35), a slave controller, a slave memory and a slave communication module are all arranged on the slave control circuit board (40), and a temperature sensor and a heat dissipation driving circuit electrically connected to the slave controller are arranged on the slave control circuit board (40); a transmission shaft is rotatably and penetratingly installed at the center of the top of the electrical control box (35), and a plurality of cantilever rods (37) are horizontally fixed at the upper end of the transmission shaft. Heat dissipation suspension rods are vertically arranged below the cantilever ends of each cantilever rod (37), and heat dissipation scraping blades (39) are obliquely arranged at the lower ends of the heat dissipation suspension rods, and each heat dissipation scraping blade (39) is at a different height; the heat dissipation driving circuit is electrically connected to the driving motor (36), and the driving motor (36) is used for driving the transmission shaft to rotate; a plurality of heat dissipation blocks are fixedly arranged on the circumferential side wall of the electrical control box (35), and the heat dissipation thin sheets (38) of each heat dissipation block horizontally extend out of the electrical control box (35) to form an annular heat dissipation area with different heights outside the electrical control box (35), and each heat dissipation scraping blade (39) horizontally moves in the annular heat dissipation area at different height positions; an annular heat conduction flat pipe (42) is arranged in the electrical control box (35), and the annular heat conduction flat pipe (42) is attached to the heat dissipation block; a chip heat dissipation strip (41) extending to the slave control circuit board (40) and a motor heat dissipation strip (43) extending to the driving motor (36) are fixedly connected to the annular heat conduction flat pipe (42), and an arc-shaped heat conduction plate (44) tightly attached to the side wall of the driving motor (36) is arranged at the end of the motor heat dissipation strip (43).

9. The electromagnetic radiation monitor for coal and rock dynamic disaster monitoring according to claim 1, characterized in that: The mounting bracket includes a bottom support plate (5), two hinge mounting seats (6), three telescopic support legs, a hinge main shaft (17) and a rotary positioning bolt (9); the bottom support plate (5) is rotatably mounted at the center of the bottom of the explosion-proof shell through a bottom support main shaft (8), the two hinge mounting seats (6) are arranged on the lower side surface of the bottom support plate (5), and the hinge main shaft (17) is mounted on the two hinge mounting seats (6); an arc-shaped adjustment hole (7) is arranged around the hinge main shaft (17) on each of the two hinge mounting seats (6), the ends of the two telescopic support legs are respectively swingably and hinge-mounted at the two ends of the hinge main shaft (17) and locked on the arc-shaped adjustment hole (7) through a tension bolt (11), and the end of the other telescopic support leg is swingably and hinge-mounted at the middle of the hinge main shaft (17); the rotary positioning bolt (9) is threadedly and penetratingly screwed on the bottom support plate (5), and the end of the screw rod of the rotary positioning bolt (9) presses on the bottom of the explosion-proof shell.

10. The monitoring method of the electromagnetic radiation monitor for coal and rock dynamic disaster monitoring according to claim 5, characterized in that, The method comprises the following steps: Step 1: Select each monitoring point in the mine according to the monitoring requirements, and select the installation surface of the electromagnetic radiation monitoring terminal at each monitoring point according to the installation environment. Step 2: Install the electromagnetic radiation monitoring terminal on the selected installation surface through the installation bracket, and ensure that the distance between the upper side of the upper housing (18) and the top surface of the monitoring point is greater than the distance threshold, and the distance between the lower side of the lower housing (1) and the ground surface of the monitoring point is greater than the distance threshold. Then, adjust the levelness of the explosion-proof housing through the installation bracket to make the upper side of the upper housing (18) and the lower side of the lower housing (1) both in a horizontal state. Step 3: Rotate and adjust the explosion-proof housing. Taking the center of the upper side of the explosion-proof housing as the coordinate origin, rotate the magnetic field sensors on the four side edges of the upper side of the explosion-proof housing to the four directions of due south, due north, due east, and due west, and then lock the rotation of the explosion-proof housing. Step 4: Adjust the four magnetic field sensors on the upper housing (18) to tilt upward to the upper side of the upper surface of the upper housing (18), and use the corresponding angle locking mechanism to lock the tilt angles of the four upper magnetic field sensors. Then, adjust the inner arc shielding blades (47) and the outer arc shielding blades (48) on the four upper magnetic field sensors to make the sides of the inner arc shielding blades (47) and the outer arc shielding blades (48) close to the upper surface of the upper housing (18) for shielding. Step 5: Adjust the four magnetic field sensors on the lower housing (1) to tilt downward to the lower side of the lower surface of the lower housing (1), and use the corresponding angle locking mechanism to lock the tilt angles of the four lower magnetic field sensors. Then, adjust the inner arc shielding blades (47) and the outer arc shielding blades (48) on the four lower magnetic field sensors to make the sides of the inner arc shielding blades (47) and the outer arc shielding blades (48) close to the lower surface of the lower housing (1) for shielding. Step 6: Electrically connect the slave communication modules of each electromagnetic radiation monitoring terminal to the master communication module with respective explosion-proof cables, and the main controller communicates with the remote control center through the router. Step 7: Use each electromagnetic shielding cover to surround and shield each electromagnetic radiation monitoring terminal to cut off the interference of the environmental magnetic field on the electromagnetic radiation monitoring terminal. Then, the main controller sends a calibration instruction to the slave communication module of each electromagnetic radiation monitoring terminal through the master communication module. After the slave controller obtains the calibration instruction, it generates a standard calibration signal through the signal generation circuit and inputs the calibration signal into the signal processing circuit through the calibration signal input terminal. Then, the standard calibration signal is output from the feedback signal input terminal of the signal processing circuit to the feedback coil circuit to generate a calibration electromagnetic field. Then, the signal processing circuit amplifies the electromagnetic signal sensed by the detection coil circuit. Then, the high-speed data acquisition module acquires the amplified electromagnetic signal and takes the acquired electromagnetic signal as the calibration electromagnetic signal. Then, disassemble each electromagnetic shielding cover and stop the signal generation of the signal generation circuit. Step 8, the main controller obtains the acquisition instruction of the remote control center in real time. After the main controller obtains the acquisition instruction, the main controller forwards the acquisition instruction to each slave communication module through the main communication module. After each slave controller receives the acquisition instruction, the signal processing circuit amplifies the actual electromagnetic signal sensed by the detection coil circuit, and then the high-speed data acquisition module acquires the amplified actual electromagnetic signal. Then, the slave controller normalizes the acquired actual electromagnetic signal according to the calibrated electromagnetic signal to obtain the actual output signal, and then sends the actual output signal to the main controller through the communication between the slave communication module and the main communication module. The main controller temporarily stores the actual output signal in the main memory, and then the main controller forwards the actual output signal in the main memory to the remote control center through the router.

Images