Coal mine underground micro-seismic electrical coupling integrated monitoring device and process

Abstract

The invention provides an underground coal mine micro-seismic electrical coupling integrated monitoring device and process, and the device comprises a power conversion and management circuit which is connected with a transmitting circuit, a signal conditioning and amplifying circuit, a receiving protection circuit, a signal collection circuit, a sequential circuit, a control circuit and a data transmission circuit for power supply. The control circuit is connected with the transmitting circuit; the signal conditioning and amplifying circuit, the receiving protection circuit, the signal acquisition circuit and the control circuit are connected in sequence; the sequential circuit is connected with the control circuit; the control circuit is connected with the data transmission circuit. According to the invention, one monitoring device is utilized to realize simultaneous micro-seismic and electrical monitoring and micro-seismic and electrical data coupling processing, so that the number of equipment is reduced, and the underground coal mine geological disaster monitoring effect is improved. Meanwhile, the device is utilized to realize a micro-seismic electrical method coupling integrated monitoring construction process.

Description

Technical Field

[0001] The invention belongs to the technical field of mine geophysical exploration, relates to a monitoring device, and specifically to an underground microseismic electrical method coupling integrated monitoring device and process for a coal mine. Background Art

[0002] As the depth of coal mining increases, the prevention and control of rock burst, roof disasters, and mine water hazards are becoming increasingly severe. Microseismic monitoring and electrical monitoring technology have been used as a major means to establish a comprehensive monitoring system for rock burst, mine water hazards, roof disasters, and other multi-parameters.

[0003] Electrical monitoring is based on network parallel acquisition technology. By monitoring the electric field, the water-rich state of the medium can be intuitively obtained. By monitoring the abnormal geoelectric field, the situation of groundwater can be reflected, thereby achieving early warning of bottom plate water damage.

[0004] Microseismic monitoring can provide early warning of abnormal geological structures and impact ground pressure at the mine working face, and electrical monitoring can provide early warning of mine water hazards.

[0005] Due to the lack of integrated microseismic and electrical monitoring equipment in the existing technology, in order to simultaneously perform microseismic and electrical monitoring in actual engineering applications, a microseismic monitoring system and an electrical monitoring system are often deployed on the working face at the same time. The two systems have large equipment quantities, cumbersome construction, and heavy maintenance tasks for the monitoring systems. In addition, the two systems make it difficult to integrate the monitoring data, which is not conducive to the promotion and application of transparent geology. Summary of the invention

[0006] In view of the shortcomings of the prior art, the purpose of the present invention is to provide an integrated monitoring device and process for microseismic electrical coupling in underground coal mines, so as to solve the technical problem that the monitoring data of two sets of monitoring devices in the prior art are not easy to merge.

[0007] In order to solve the above technical problems, the present invention adopts the following technical solutions to achieve the above problems:

[0008] A coal mine underground microseismic electrical coupling integrated monitoring device comprises a power conversion and management circuit, which is respectively connected to a transmitting circuit, a signal conditioning and amplifying circuit, a receiving protection circuit, a signal acquisition circuit, a timing circuit, a control circuit and a data transmission circuit for power supply.

[0009] The control circuit is connected to the transmitting circuit.

[0010] The signal conditioning and amplifying circuit, receiving protection circuit, signal acquisition circuit and control circuit are connected in sequence.

[0011] The timing circuit is connected to the control circuit.

[0012] The control circuit is connected to the data transmission circuit.

[0013] The present invention also has the following technical features:

[0014] The power conversion and management circuit includes a 12V intrinsically safe power supply, which is connected to the VIN port of chip U1, the BST port of chip U1 is connected to one end of capacitor C27, the other end of capacitor C27 is connected to one end of inductor L4, and the other end of inductor L4 outputs 5V power supply; the 12V intrinsically safe power supply is connected to the IN port of chip U2, and the OUT port of chip U2 outputs 2.5V power supply; the other end of inductor L4 is connected to the IN port of chip U3, and the OUT port of chip U3 outputs 3.3V power supply.

[0015] The transmitting circuit includes a transistor Q306, the emitter of the transistor Q306 is connected to the IN+ port of the chip G302, and the OUT port of the chip G302 outputs the transmitting current.

[0016] The signal conditioning and amplification circuit includes a chip U4, a VIN+ port of the chip U4 is connected to one end of the signal output by the moving coil detector through a resistor R3, and a VIN- port of the chip U4 is connected to the other end of the signal output by the moving coil detector through a resistor R2; a resistor R1 is connected between one end of the signal output by the moving coil detector and the other end of the signal output by the moving coil detector.

[0017] The receiving protection circuit includes a resistor R4 and a resistor R5, the output end of the resistor R4 is connected between two diodes D1 connected in series for overvoltage protection, and the OUT0+ output end of the receiving protection circuit is also connected between the two diodes D1 connected in series; the output end of the resistor R5 is connected between two diodes D2 connected in series for overvoltage protection, and the OUT0- output end of the receiving protection circuit is also connected between the two diodes D2 connected in series; the resistor R4 is connected in parallel with a capacitor C3 and a resistor R6 connected in series, and the resistor R5 is connected in parallel with a capacitor C4 and a resistor R7 connected in series, and a capacitor C8 is also connected between the output end of the resistor R4 and the output end of the resistor R5.

[0018] The signal acquisition circuit includes a chip U5.

[0019] The timing circuit includes a chip U6 and a chip U7 which are arranged in parallel.

[0020] The control circuit includes an embedded processor U8.

[0021] The data transmission circuit includes chip U9 and chip 10, the TXN port of chip U9 is connected to the TD-port of chip 10, the TXP port of chip U9 is connected to the TD+ port of chip 10, the RXN port of chip U9 is connected to the RD-port of chip 10, the RXP port of chip U9 is connected to the RD+ port of chip 10, the LED1 port of chip U9 is connected to the LED(Y)-port of chip 10, and the LED2 port of chip U9 is connected to the LED(G)-port of chip 10.

[0022] The VOUT+ port of the chip U4 is connected to the input end of R4 in the receiving protection circuit, and the VOUT- port of the chip U4 is connected to the input end of R5 in the receiving protection circuit.

[0023] The OUT0+ output terminal of the receiving protection circuit is connected to the AINN2 port of the chip U5, and the OUT0- output terminal of the receiving protection circuit is connected to the AINP2 port of the chip U5.

[0024] The SCLK port of the chip U5 is connected to the ADC_SCLK port of the chip U8, and the DRDY port of the chip U5 is connected to the ADC_DRDY port of the chip U8.

[0025] In the power conversion and management circuit, chip U1 uses a chip of model LT8609IMSE, chip U2 uses a chip of model LT1763CS8-2.5, and chip U3 uses a chip of model AMS1117-3.3.

[0026] In the transmitting circuit, the transistor Q306 uses a transistor of model 9015, and the chip G302 uses an optical coupling device of model 6N137.

[0027] In the signal conditioning and amplification circuit, the chip U4 uses a chip model OPA1632.

[0028] In the receiving protection circuit, both diode D1 and diode D2 are BAT54S diodes.

[0029] In the signal acquisition circuit, the chip U5 uses a chip model ADS1282.

[0030] In the timing circuit, the chip U6 uses a current driver chip of model ULN2003D, and the chip U7 uses a level conversion chip of model MAX3232.

[0031] In the control circuit, the embedded processor U8 uses an embedded processor of model imx6ull.

[0032] In the data transmission circuit, the chip U9 uses a chip of model LAN8720A, and the chip U10 uses a network isolation transformer of model HR911105A.

[0033] The power conversion and management circuit is used to convert the 12V intrinsically safe power supply into the 5V power supply, 3.3V power supply and 2.5V power supply required by the underground microseismic electrical method coupling integrated monitoring device of the coal mine.

[0034] The transmitting circuit is used to adopt high voltage transmission to improve signal strength under the premise of meeting the design requirements of intrinsically safe circuits in underground coal mines.

[0035] The signal conditioning and amplifying circuit is used to filter and amplify the signal output by the detector, and to filter and amplify the voltage signal of the electrode to be collected.

[0036] The receiving protection circuit is used to perform voltage limiting protection on the signal to prevent voltage mutation from damaging the subsequent acquisition circuit.

[0037] The signal acquisition circuit is used for real-time acquisition of vibration and voltage signals.

[0038] The timing circuit is used to provide a clock source for the integrated monitoring device for microseismic electrical coupling in underground coal mines, and then outputs 32768Hz and 4096KHz precise clocks respectively after being processed by the logic circuit.

[0039] The control circuit is used to realize the collection, interruption, storage and transmission control of the integrated monitoring device for microseismic electrical coupling in underground coal mines.

[0040] The data transmission circuit is used to digitally process the collected signals and then transmit the data through the Ethernet transmission interface.

[0041] The present invention also protects a coal mine underground microseismic electrical method coupling integrated monitoring process, which adopts the coal mine underground microseismic electrical method coupling integrated monitoring device as described above.

[0042] Compared with the prior art, the present invention has the following technical effects:

[0043] (I) The present invention uses a set of monitoring devices to achieve simultaneous microseismic and electrical monitoring, coupled processing of microseismic and electrical data, reducing the number of equipment and improving the monitoring effect of underground geological disasters in coal mines. At the same time, the device is used to realize the monitoring construction process of integrated microseismic and electrical coupling.

[0044] (II) The present invention can conduct comprehensive monitoring and early warning of rock mass fractures and water infiltration in the monitoring area through combined microseismic and electrical monitoring, which is of great significance for safe and efficient mining of coal mines. Microseismic and electrical coupling monitoring provides data support for coal mine geological transparency and is a necessary means for coal mine geological transparency.

[0045] (III) The present invention utilizes microseismic-electrical coupling monitoring technology and devices to realize parallel real-time monitoring of microseismic signals and electrical signals in coal mines. According to the actual needs of microseismic-electrical monitoring in coal mines, an integrated microseismic-electrical monitoring construction process is designed to improve the deployment efficiency and monitoring effect of the microseismic-electrical monitoring system in coal mines.

[0046] (IV) The present invention realizes the parallel monitoring of two signals in one system. On the basis of ensuring the intrinsic safety design of coal mine underground, the power conversion and transmission circuit are used to improve the transmission power and enhance the acquisition performance of the system. A set of acquisition and control system is used to realize the coupled integrated processing of microseismic and electrical data, realize the parallel monitoring of coal mine underground structure and water-rich area, and provide guarantee for the safety of coal mine underground. BRIEF DESCRIPTION OF THE DRAWINGS

[0047] FIG. 1( a ) is a schematic diagram of a chip U1 and peripheral circuits in a power conversion and management circuit.

[0048] FIG1( b ) is a schematic diagram of the chip U2 and peripheral circuits in the power conversion and management circuit.

[0049] FIG1( c ) is a schematic diagram of the chip U3 and peripheral circuits in the power conversion and management circuit.

[0050] FIG2( a ) is a schematic diagram of transistor Q306 and peripheral circuits of the transmitting circuit.

[0051] FIG2( b ) is a schematic diagram of the chip G302 and peripheral circuits of the transmitting circuit.

[0052] Figure 3 This is a schematic diagram of chip U4 and peripheral circuits in the signal conditioning and amplification circuit.

[0053] Figure 4 This is a circuit diagram of a receiving protection circuit.

[0054] Figure 5 This is a schematic diagram of chip U5 and peripheral circuits in the signal acquisition circuit.

[0055] FIG6( a ) is a schematic diagram of chip U6 and peripheral circuits in a sequential circuit.

[0056] FIG6( b ) is a schematic diagram of chip U7 and peripheral circuits in the sequential circuit.

[0057] Figure 7It is a schematic diagram of the embedded processor U8 and peripheral circuits in the control circuit.

[0058] FIG8( a ) is a schematic diagram of chip U9 and peripheral circuits in the data transmission circuit.

[0059] FIG8( b ) is a schematic diagram of the chip U10 and peripheral circuits in the data transmission circuit.

[0060] The specific contents of the present invention are further explained in detail below in conjunction with embodiments. DETAILED DESCRIPTION

[0061] It should be noted that, unless otherwise specified, all electronic components in the present invention are electronic components known in the prior art.

[0062] Specific embodiments of the present invention are given below. It should be noted that the present invention is not limited to the following specific embodiments, and all equivalent changes made on the basis of the technical solution of this application fall within the protection scope of the present invention.

[0063] Embodiment 1:

[0064] This embodiment provides an integrated monitoring device for underground microseismic electrical coupling in a coal mine, including a power conversion and management circuit, which is respectively connected to a transmitting circuit, a signal conditioning and amplifying circuit, a receiving protection circuit, a signal acquisition circuit, a timing circuit, a control circuit and a data transmission circuit for power supply.

[0065] The control circuit is connected to the transmitting circuit.

[0066] The signal conditioning and amplifying circuit, the receiving protection circuit, the signal collecting circuit and the control circuit are connected in sequence.

[0067] The timing circuit is connected to the control circuit.

[0068] The control circuit is connected to the data transmission circuit.

[0069] like Figure 1(a) to Figure 1(c) As shown, the power conversion and management circuit includes a 12V intrinsically safe power supply, the 12V intrinsically safe power supply is connected to the VIN port of the chip U1, the BST port of the chip U1 is connected to one end of the capacitor C27, the other end of the capacitor C27 is connected to one end of the inductor L4, and the other end of the inductor L4 outputs a 5V power supply; the 12V intrinsically safe power supply is connected to the IN port of the chip U2, and the OUT port of the chip U2 outputs a 2.5V power supply; the other end of the inductor L4 is connected to the IN port of the chip U3, and the OUT port of the chip U3 outputs a 3.3V power supply.

[0070] like Figure 2(a) to Figure 2(b)As shown, the transmitting circuit includes a transistor Q306, the emitter of the transistor Q306 is connected to the IN+ port of the chip G302, and the OUT port of the chip G302 outputs the transmitting current.

[0071] like Figure 3 As shown, the signal conditioning and amplification circuit includes a chip U4, a VIN+ port of the chip U4 is connected to one end of the signal output by the moving coil detector through a resistor R3, and a VIN- port of the chip U4 is connected to the other end of the signal output by the moving coil detector through a resistor R2; a resistor R1 is connected between one end of the signal output by the moving coil detector and the other end of the signal output by the moving coil detector.

[0072] like Figure 4 As shown, the receiving protection circuit includes a resistor R4 and a resistor R5, the output end of the resistor R4 is connected between two diodes D1 connected in series for overvoltage protection, and the OUT0+ output end of the receiving protection circuit is also connected between the two diodes D1 connected in series; the output end of the resistor R5 is connected between two diodes D2 connected in series for overvoltage protection, and the OUT0- output end of the receiving protection circuit is also connected between the two diodes D2 connected in series; the resistor R4 is connected in parallel with a capacitor C3 and a resistor R6 connected in series, the resistor R5 is connected in parallel with a capacitor C4 and a resistor R7 connected in series, and a capacitor C8 is also connected between the output end of the resistor R4 and the output end of the resistor R5.

[0073] like Figure 5 As shown, the signal acquisition circuit includes a chip U5.

[0074] As shown in FIG. 6( a ) and FIG. 6( b ), the sequential circuit includes a chip U6 and a chip U7 which are arranged in parallel.

[0075] like Figure 7 As shown, the control circuit includes an embedded processor U8.

[0076] As shown in Figures 8(a) and 8(b), the data transmission circuit includes chip U9 and chip 10, the TXN port of chip U9 is connected to the TD-port of chip 10, the TXP port of chip U9 is connected to the TD+ port of chip 10, the RXN port of chip U9 is connected to the RD-port of chip 10, the RXP port of chip U9 is connected to the RD+ port of chip 10, the LED1 port of chip U9 is connected to the LED(Y)-port of chip 10, and the LED2 port of chip U9 is connected to the LED(G)-port of chip 10.

[0077] The VOUT+ port of the chip U4 is connected to the input end of R4 in the receiving protection circuit, and the VOUT- port of the chip U4 is connected to the input end of R5 in the receiving protection circuit.

[0078] The OUT0+ output terminal of the receiving protection circuit is connected to the AINN2 port of the chip U5, and the OUT0- output terminal of the receiving protection circuit is connected to the AINP2 port of the chip U5.

[0079] The SCLK port of chip U5 is connected to the ADC_SCLK port of chip U8, and the DRDY port of chip U5 is connected to the ADC_DRDY port of chip U8.

[0080] Preferably, in the power conversion and management circuit, the chip U1 uses a chip of model LT8609IMSE, the chip U2 uses a chip of model LT1763CS8-2.5, and the chip U3 uses a chip of model AMS1117-3.3.

[0081] Preferably, in the transmitting circuit, transistor Q306 uses a transistor of model 9015, and chip G302 uses an optical coupling device of model 6N137.

[0082] In this embodiment, preferably, in the signal conditioning and amplification circuit, the chip U4 uses a chip model OPA1632.

[0083] Preferably, in the receiving protection circuit, both the diode D1 and the diode D2 are BAT54S diodes.

[0084] Preferably, in the present embodiment, in the signal acquisition circuit, the chip U5 uses a chip of model ADS1282.

[0085] Preferably, in the timing circuit, the chip U6 uses a current driver chip of model ULN2003D, and the chip U7 uses a level conversion chip of model MAX3232.

[0086] Preferably, in the control circuit, the embedded processor U8 uses an embedded processor of model imx6ull.

[0087] Preferably, in the data transmission circuit, the chip U9 uses a chip of model LAN8720A, and the chip U10 uses a network isolation transformer of model HR911105A.

[0088] Specifically, the power conversion and management circuit is used to convert the 12V intrinsically safe power supply into the 5V power supply, 3.3V power supply, and 2.5V power supply required by the integrated monitoring device for microseismic electrical coupling in underground coal mines, so as to provide stable and reliable power input to various parts of the device.

[0089] In this embodiment, preferably, Figure 1(a) to Figure 1(c)As shown, the power conversion and management circuit includes capacitor C28, capacitor C29, capacitor C30, capacitor C32, capacitor C27, capacitor C31, capacitor C33, capacitor C34, resistor R47, resistor R44, resistor R45, resistor R46, resistor R48, chip U1, capacitor C1, capacitor C2, capacitor C3, chip U2, capacitor C7, capacitor C8, capacitor C9, capacitor C10, capacitor C11, and chip U3.

[0090] In this embodiment, preferably, the connection relationship and specific assignment of each electronic component in the power conversion and management circuit are as follows: Figure 1(a) to Figure 1(c) shown.

[0091] Furthermore, the power conversion and management circuit adopts a step-by-step voltage reduction method to provide the required power supplies for the integrated monitoring device for microseismic electrical coupling in underground coal mines. The step-by-step voltage reduction can not only improve the power conversion efficiency but also facilitate the separate control of each part of the power supply. According to the working needs of the device, each part of the power supply can be started independently, thereby realizing the power consumption control of the entire device and realizing the intrinsic safety design of the device.

[0092] Specifically, the transmitting circuit is used to adopt high voltage transmission to improve signal strength under the premise of meeting the design requirements of intrinsically safe circuits in coal mines. At the same time, high voltage transmission will generate strong interference to the entire circuit. The microseismic electrical method collects weak signals. The circuit of the present invention can eliminate the interference caused by transmission.

[0093] In this embodiment, preferably, Figure 2(a) to Figure 2(b) As shown, the transmitting circuit includes a resistor R329, a resistor R322, a capacitor C318, a capacitor C308, a transistor Q306, a chip G302, a resistor R310, and a capacitor C336.

[0094] In this embodiment, preferably, the connection relationship and specific assignment of each electronic component in the transmitting circuit are as follows: Figure 2(a) to Figure 2(b) shown.

[0095] Furthermore, the transmitting circuit should provide high-power signals as much as possible while taking into account the intrinsically safe circuit design requirements. The transmitting circuit will generate high-voltage signals, which will interfere with the electrical acquisition and microseismic acquisition in the device and affect the acquisition performance of the device. The transmitting circuit designed in the present invention can eliminate high-voltage interference, and combined with the partial structural design of the transmitting circuit, it can effectively isolate the influence of the transmitting circuit on other circuits.

[0096] Specifically, the signal conditioning and amplification circuit is used to filter and amplify the signal output by the detector, and to filter and amplify the voltage signal of the electrode to be collected. Each collection channel has a separate set of independent signal conditioning and amplification circuits. The device of the present invention uses 12 independent channels to perform signal conditioning and amplification of each channel separately.

[0097] In this embodiment, preferably, Figure 3 As shown, the signal conditioning and amplification circuit includes a resistor R1, a resistor R2, a resistor R3, a capacitor C9, a capacitor C6, a capacitor C11, and a chip U4.

[0098] In this embodiment, the connection relationship and specific assignment of each electronic component in the signal conditioning and amplification circuit are preferably as follows: Figure 3 shown.

[0099] Furthermore, the signal conditioning and amplification circuit can effectively improve the signal's anti-interference ability and signal quality from the source, filter interference through this part of the circuit, and increase the signal amplitude. In order to achieve multi-channel parallel acquisition and improve the signal quality of each channel, the present invention adopts multi-channel independent signal conditioning and amplification to effectively prevent signal crosstalk between channels.

[0100] Specifically, the receiving protection circuit is used to limit the voltage of the signal to prevent voltage mutation from damaging the subsequent acquisition circuit. Each acquisition channel has a separate set of independent receiving protection circuits. The device of the present invention uses 12 independent sets of receiving protection circuits to perform overvoltage protection on the signals of the 12 acquisition channels. After conditioning and amplification, the signal enters the receiving protection circuit, which prevents abnormal signals from damaging the subsequent acquisition circuit.

[0101] In this embodiment, preferably, Figure 4 As shown, the receiving protection circuit includes a resistor R5, a resistor R7, a resistor 4, a resistor R6, a capacitor C4, a capacitor C3, a capacitor C8, a diode D1, and a diode D2.

[0102] In this embodiment, preferably, the connection relationship and specific assignment of each electronic component in the receiving protection circuit are as follows: Figure 4 shown.

[0103] Furthermore, in order to prevent abnormal signals from entering the subsequent acquisition circuit and causing damage, the present invention adopts a multi-channel independent receiving protection circuit to protect the signals of each channel, effectively improving the reliability of the device. The receiving protection circuit can set the protection threshold by adjusting the resistance value according to the characteristics of the microseismic electrical method signals in the coal mine.

[0104] Specifically, the signal acquisition circuit is used for real-time acquisition of vibration and voltage signals. The detector converts the vibration signal into a voltage signal, which is digitized by a seismic AD converter after shaping and filtering, and then amplified and transmitted to the embedded processor in the control circuit through the SPI interface for processing. The voltage signal output by the electrode is digitized by an AD converter after filtering and amplification, and transmitted to the embedded processor in the control circuit through the SPI interface for processing. The signal acquisition of microseismic and electrical data is completed at the same time. The signal acquisition circuit uses 6 independent channels for signal acquisition.

[0105] In this embodiment, preferably, Figure 5 As shown, the signal acquisition circuit includes chip U1, capacitor C1, capacitor C5, and capacitor C10. The CH0_CLK signal in chip U5 is provided by the 4096KHz signal generated by the clock circuit; the CH0_SCLK port, CH0_DOUT port, CH0_DIN port, CH0_RDY port, CH0_SYNC port, CH0_RESET port, and CH0_PWDN port in chip U5 are respectively connected to the embedded processor in the control circuit, and the embedded controller controls these signals to perform signal acquisition and digitization, and transmits them to the embedded processor through the SPI interface.

[0106] In this embodiment, preferably, the connection relationship and specific assignment of each electronic component in the signal acquisition circuit are as follows: Figure 5 shown.

[0107] Furthermore, the signal acquisition circuit adopts a multi-channel independent circuit to realize the acquisition and AD conversion of multi-channel microseismic and electrical signals. The detector or electrode is switched in real time according to the control signal of the control circuit to collect microseismic and electrical signals, which can prevent the mutual interference of microseismic and electrical signals. The independence of each channel can effectively prevent interference between channels.

[0108] Specifically, the timing circuit uses a high-precision 16.384MHz constant temperature crystal oscillator to provide a clock source for the underground microseismic electrical method coupled integrated monitoring device of the coal mine, and then after being processed by the logic circuit, it outputs 32768Hz and 4096KHz precise clocks respectively. Among them, 32768Hz provides a clock source for the clock device, and 4096KHz provides a stable clock source for the AD conversion circuit. The clock device provides accurate timing for the microseismic electrical method monitoring device, and combined with the timing circuit, it ensures the consistency of the timing between devices.

[0109] In the preferred embodiment, as shown in Fig. 6 (a) and Fig. 6 (b), the timing circuit includes chip U6, resistor R17, resistor R18, resistor R19, chip U7, capacitor C3, capacitor C4, capacitor C5, capacitor C6, and capacitor C7. The CPU_ANALOG_POWER_EN, CPU_ANALOG_POWER_EN, and CPU_CLK4096k_EN signals in chip U6 are connected to the embedded processor U8 in the control circuit, and these signals are controlled by the embedded processor U8 to generate the required timing. The GPS_DATA signal in chip U7 is provided by the external GPS timing module, and the ARM_GPS_RXD signal in chip U7 is connected to the embedded processor U8 in the control circuit, and is controlled by the embedded processor U8.

[0110] Preferably, in this embodiment, the connection relationship and specific assignment of each electronic component in the sequential circuit are shown in FIG. 6( a ) and FIG. 6( b ).

[0111] Furthermore, the timing circuit uses a high-precision constant temperature crystal oscillator to provide a high-precision clock source for the integrated monitoring device for microseismic electrical coupling in underground coal mines, and uses clock devices to time each monitoring device to ensure clock synchronization between each monitoring device. On the other hand, the clock circuit generates the clock frequencies required by the device through logic devices to provide a stable clock for each functional module. There is no cable connection between the monitoring devices, and the precise clock provided by the timing circuit ensures that the timing of each monitoring device is consistent.

[0112] Specifically, the control circuit uses an embedded processor U8 as the central control unit of the underground microseismic-electrical coupling integrated monitoring device for coal mines, which is used to realize the acquisition, interruption, storage and transmission control of the underground microseismic-electrical coupling integrated monitoring device for coal mines, as well as the control of the working mechanism of the entire instrument. The control circuit develops an embedded processing program based on the working sequence and control logic of the device, which runs on the embedded processor U8 to realize the control and scheduling of the entire device from the software. The control part is the core of the entire device, especially the embedded program.

[0113] In this embodiment, preferably, Figure 7 As shown, the control circuit consists of 60 ports on the left and 60 ports on the right, with a total of 120 ports. The control circuit includes an embedded processor U8, a resistor R1, a resistor R2, a resistor R3, and a resistor R4.

[0114] In this embodiment, preferably, the connection relationship and specific assignment of each electronic component in the control circuit are as follows: Figure 7 shown.

[0115] Furthermore, the control circuit is the core of the integrated monitoring device for microseismic and electrical coupling in underground coal mines, which realizes the coordination and control of various functional modules. According to the construction process of the integrated monitoring system for microseismic and electrical coupling in underground coal mines, the workflow of the device is designed, and the control circuit realizes the control of the workflow to ensure that various functional modules work together according to the workflow.

[0116] Specifically, the data transmission circuit is used to digitally process the collected signals and then transmit the data through the Ethernet transmission interface.

[0117] In this embodiment, as shown in FIG8(a) and FIG8(b), the data transmission circuit includes resistor R39, resistor R35, resistor R38, resistor R37, resistor R30, resistor R31, resistor R32, resistor R33, chip U9, capacitor C26, capacitor C21, capacitor C22, capacitor C23, capacitor C24, capacitor C25, capacitor C30, capacitor C31, chip U10, resistor R40, and resistor R41. Among them, the signals ENET_MDIO, ENET_MDC, ENET2_TXD0, ENET2_TXD1, ENET2_TXEN, ENET2_RXD0, ENET2_RXD1, ENET2_RXER, ENET2_CRS_DV, ENET2_INT, and ENET2_RST are connected to the embedded processor U8 in the control circuit, and the embedded processor U8 manages and controls the data transmission.

[0118] Preferably, in this embodiment, the connection relationship and specific assignment of various electronic components in the data transmission circuit are as shown in FIG. 8( a ) and FIG. 8( b ).

[0119] Furthermore, the data transmission circuit uses an isolation device to transmit the collected microseismic electrical data to the underground ring network of the coal mine through Ethernet, and transmits the data to the ground monitoring host in real time through the underground ring network of the coal mine. The data transmission circuit part can realize both Ethernet electrical port and Ethernet optical port through the optical cable laid underground for data transmission, which can effectively improve the speed and reliability of data transmission.

[0120] Embodiment 2:

[0121] This embodiment provides an underground coal mine microseismic electrical coupling integrated monitoring process, which uses the underground coal mine microseismic electrical coupling integrated monitoring device provided in Example 1.

[0122] The process includes the following steps:

[0123] Step 1: Conduct on-site survey and determine monitoring points. Determine monitoring points based on the requirements of transparent geological work in coal mines and the layout of coal mine working faces. The selection of monitoring points should cover as wide an area as possible, so that the vibration and resistivity transformation of the monitoring area can be fully monitored. At the same time, the convenient layout of vibration detectors and electrodes should also be considered. Mark the monitoring points on site, and enter the coordinates of the monitoring points into the microseismic electrical coupling monitoring system software. The later monitoring data processing will combine the entered monitoring point location coordinate information to display the monitoring results.

[0124] Step 2: Lay out the seismic detectors, electrodes, and communication cables on site. Design a construction layout for on-site microseismic electrical coupling monitoring based on the monitoring points determined in the early stage. In order to improve the signal quality, place the seismic detector in a shallow hole at a depth of 3m and fill it with cannon mud to ensure that the seismic detector is coupled to the coal seam. Fix the electrode firmly at the monitoring point to ensure that the electrode is coupled to the measured point. After laying out the seismic detectors and electrodes, lay out the communication cables dedicated to the microseismic electrical coupling monitoring device, and connect the seismic detectors and electrodes to the corresponding connectors of the communication cable in sequence according to the designed construction layout.

[0125] Step three: Install the integrated monitoring device for underground microseismic electro-electric coupling on site and conduct system joint debugging. According to the designed construction layout of on-site microseismic electro-electric coupling monitoring, fix the microseismic electro-electric coupling monitoring device in the corresponding position, and connect the communication cables that have been connected to the vibration detector and electrode in sequence to the microseismic electro-electric coupling monitoring device, ensuring that the wiring is connected to the corresponding connectors in sequence and the wiring is reliable. Connect each microseismic electro-electric coupling monitoring device to the industrial ring network underground in the coal mine, and assign a fixed IP address to each device. Connect the underground 127V or 660V power supply to the explosion-proof and intrinsically safe power supply of the microseismic electro-electric coupling monitoring device on site, and connect the 12V intrinsically safe power supply output by the explosion-proof and intrinsically safe power supply to the corresponding interface of the microseismic electro-electric coupling monitoring device. Press the power button of each microseismic-electrical coupling monitoring device on site to power on the device, open the monitoring software supporting the microseismic-electrical coupling monitoring device on the well, and perform system integration to ensure that the monitoring software on the well can view the status of each monitoring device and the vibration and electrical data collected at each monitoring point in real time.

[0126] Step 4: Long-term on-site tracking and monitoring, real-time uploading of microseismic electrical monitoring data, and automatic fusion processing of microseismic electrical data by data processing software. The underground microseismic electrical coupling monitoring device collects microseismic and electrical data in real time, and uploads the microseismic and electrical data to the ground monitoring host in real time. The data processing software supporting the microseismic electrical coupling monitoring device fuses the uploaded microseismic electrical data in real time, realizes automatic extraction of microseismic events, automatic positioning combined with monitoring point coordinate information, and automatic mapping of electrical monitoring effects.

[0127] Step 5: Combine the geological data of coal mines to form a report on rock fracture and water infiltration in the monitoring area, providing data support for coal mine geological transparency. Based on the results of microseismic electrical data fusion processing and combined with the underground geological data of coal mines, a report on geological structure and water abundance in the monitoring area is issued.

Claims

1. A coal mine underground microseismic electrical method coupling integrated monitoring device, characterized in that: It includes a power conversion and management circuit, which is respectively connected to the transmitting circuit, the signal conditioning and amplifying circuit, the receiving protection circuit, the signal acquisition circuit, the timing circuit, the control circuit and the data transmission circuit for power supply; The control circuit is connected to the transmitting circuit; The signal conditioning and amplification circuit, receiving protection circuit, signal acquisition circuit and control circuit are connected in sequence; The timing circuit is connected to the control circuit; The control circuit is connected to the data transmission circuit.

2. The integrated monitoring device for microseismic electrical coupling in underground coal mines according to claim 1, characterized in that: The power conversion and management circuit includes a 12V intrinsically safe power supply, which is connected to the VIN port of chip U1, the BST port of chip U1 is connected to one end of capacitor C27, the other end of capacitor C27 is connected to one end of inductor L4, and the other end of inductor L4 outputs 5V power supply; the 12V intrinsically safe power supply is connected to the IN port of chip U2, and the OUT port of chip U2 outputs 2.5V power supply; the other end of inductor L4 is connected to the IN port of chip U3, and the OUT port of chip U3 outputs 3.3V power supply; The transmitting circuit includes a transistor Q306, the emitter of the transistor Q306 is connected to the IN+ port of the chip G302, and the OUT port of the chip G302 outputs the transmitting current; The signal conditioning and amplification circuit includes a chip U4, a VIN+ port of the chip U4 is connected to one end of the signal output by the moving coil detector through a resistor R3, and a VIN- port of the chip U4 is connected to the other end of the signal output by the moving coil detector through a resistor R2; a resistor R1 is connected between one end of the signal output by the moving coil detector and the other end of the signal output by the moving coil detector; The receiving protection circuit includes a resistor R4 and a resistor R5, the output end of the resistor R4 is connected between two diodes D1 connected in series for overvoltage protection, and the OUT0+ output end of the receiving protection circuit is also connected between the two diodes D1 connected in series; the output end of the resistor R5 is connected between two diodes D2 connected in series for overvoltage protection, and the OUT0- output end of the receiving protection circuit is also connected between the two diodes D2 connected in series; the resistor R4 is connected in parallel with a capacitor C3 and a resistor R6 connected in series, the resistor R5 is connected in parallel with a capacitor C4 and a resistor R7 connected in series, and a capacitor C8 is also connected between the output end of the resistor R4 and the output end of the resistor R5; The signal acquisition circuit includes a chip U5; The control circuit includes an embedded processor U8.

3. The integrated monitoring device for microseismic electrical coupling in underground coal mines according to claim 2, characterized in that: The VOUT+ port of the chip U4 is connected to the input end of R4 in the receiving protection circuit, and the VOUT- port of the chip U4 is connected to the input end of R5 in the receiving protection circuit; The OUT0+ output terminal of the receiving protection circuit is connected to the AINN2 port of the chip U5, and the OUT0- output terminal of the receiving protection circuit is connected to the AINP2 port of the chip U5; The SCLK port of the chip U5 is connected to the ADC_SCLK port of the chip U8, and the DRDY port of the chip U5 is connected to the ADC_DRDY port of the chip U8.

4. The integrated monitoring device for underground microseismic electrical method coupling in coal mines according to claim 2, characterized in that: In the power conversion and management circuit, chip U1 uses a chip of model LT8609IMSE, chip U2 uses a chip of model LT1763CS8-2.5, and chip U3 uses a chip of model AMS1117-3.3; In the transmitting circuit, the transistor Q306 uses a transistor of model 9015, and the chip G302 uses an optical coupling device of model 6N137; In the signal conditioning and amplification circuit, the chip U4 uses a chip model OPA1632; In the receiving protection circuit, diode D1 and diode D2 are both BAT54S diodes; In the signal acquisition circuit, the chip U5 uses a chip model ADS1282; In the control circuit, the embedded processor U8 uses an embedded processor of model imx6ull.

5. The underground microseismic electrical method coupling integrated monitoring device for coal mines according to claim 1, characterized in that: The timing circuit comprises a chip U6 and a chip U7 which are arranged in parallel; the chip U6 uses a current driving chip of model ULN2003D, and the chip U7 uses a level conversion chip of model MAX3232.

6. The integrated monitoring device for microseismic electrical coupling in underground coal mines according to claim 1, characterized in that: The data transmission circuit includes chip U9 and chip 10, the TXN port of chip U9 is connected to the TD-port of chip 10, the TXP port of chip U9 is connected to the TD+ port of chip 10, the RXN port of chip U9 is connected to the RD-port of chip 10, the RXP port of chip U9 is connected to the RD+ port of chip 10, the LED1 port of chip U9 is connected to the LED(Y)-port of chip 10, and the LED2 port of chip U9 is connected to the LED(G)-port of chip 10.

7. The integrated monitoring device for microseismic electrical coupling in underground coal mines according to claim 6, characterized in that: In the data transmission circuit, the chip U9 uses a chip of model LAN8720A, and the chip U10 uses a network isolation transformer of model HR911105A.

8. The integrated monitoring device for microseismic electrical coupling in underground coal mines according to claim 1, characterized in that: The power conversion and management circuit is used to convert the 12V intrinsically safe power supply into the 5V power supply, 3.3V power supply and 2.5V power supply required by the integrated monitoring device for microseismic electrical coupling in underground coal mines; The transmitting circuit is used to adopt high voltage transmission to improve signal strength under the premise of meeting the design requirements of intrinsically safe circuits in underground coal mines; The signal conditioning and amplification circuit is used to filter and amplify the signal output by the detector, and to filter and amplify the voltage signal of the electrode to be collected; The receiving protection circuit is used to perform voltage limiting protection on the signal to prevent voltage mutation from causing damage to the subsequent acquisition circuit; The signal acquisition circuit is used for real-time acquisition of vibration and voltage signals; The timing circuit is used to provide a clock source for the integrated monitoring device for microseismic electrical coupling in underground coal mines, and then outputs 32768Hz and 4096KHz precise clocks respectively after being processed by the logic circuit; The control circuit is used to realize the acquisition, interruption, storage and transmission control of the integrated monitoring device for microseismic electrical coupling in underground coal mines; The data transmission circuit is used to digitally process the collected signals and then transmit the data through the Ethernet transmission interface.

9. A coal mine underground microseismic electrical coupling integrated monitoring process, characterized in that: The process adopts the coal mine underground microseismic electrical method coupling integrated monitoring device as described in any one of claims 1 to 8.

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