Coal mine working face electrical method real-time monitoring system and monitoring method

Abstract

The invention relates to a coal mine working face electrical method real-time monitoring system and a monitoring method. Comprising a remote terminal, a local terminal and an underground acquisition system, the underground acquisition module is used for acquiring, processing and transmitting data changes of a working face and a goaf in a coal mine; the local terminal is used for transmitting the data acquired by the underground acquisition module to the remote terminal; and the remote terminal is used for carrying out analysis and arrangement, imaging analysis and abnormity observation on the transmitted data. In the invention, the electrode assembly is arranged in the formed roadway of the mine working face, the whole stoping process of the working face can be monitored, remote control is carried out through the local terminal, and data of the electrode assembly is obtained, so that water inrush hidden danger space positions such as a water guide channel, a hidden structure and a crack dense zone behind a delineated goaf are positioned; and the accuracy of the abnormal region can be improved by changing the power supply current during monitoring.

Description

Technical Field

[0001] The invention relates to the field of coal mine work, and in particular to a coal mine working face electrical real-time monitoring system and a monitoring method. Background Art

[0002] Coal mine water damage is a common and extremely destructive problem in the coal mining process. It may lead to production safety accidents and waste of coal resources, and have a serious impact on the safe production and economic benefits of coal mines.

[0003] Traditional detection is a static exploration of the working face after it is formed. During the mining process, the original rock stress of the bottom plate rock layer is affected by mining, its stress field changes, and the stress is redistributed, causing damage to the top and bottom plates. Especially in the case of geological structures, it is more likely to form water channels, causing water inrush accidents and threatening people's safety and property.

[0004] Therefore, there is a need for a coal mine working face electrical real-time monitoring system and monitoring method with good detection effect. Summary of the invention

[0005] In view of this, the present invention aims to provide a coal mine working face electrical real-time monitoring system and monitoring method to solve the problems in the prior art.

[0006] To achieve the above object, the technical solution of the present invention is achieved as follows:

[0007] The first aspect of the present invention provides a coal mine working face electrical method real-time monitoring system, which includes a remote terminal, a local terminal and an underground acquisition system;

[0008] The underground acquisition module is used to collect, process and transmit data changes of the working face and goaf in the coal mine;

[0009] A local terminal is used to transmit the data collected by the downhole acquisition module to a remote terminal;

[0010] Remote terminal, used for analyzing and collating the transmitted data, imaging analysis, and abnormal observation;

[0011] The downhole acquisition module includes a downhole host, an acquisition card, a transmitter, and an electrode assembly;

[0012] Electrode assembly, used to measure various data of the working face in the coal mine;

[0013] The downhole host is used to receive signals from the local terminal and feed back data to the local terminal while also being able to control the opening and closing of the electrode assembly;

[0014] A transmitter, used to receive a signal from a downhole host and output an electrical signal of a preset frequency and a preset voltage value to the electrode assembly;

[0015] The acquisition card is used to collect the transmitting current of the transmitter and the receiving voltage of the electrode assembly.

[0016] Furthermore, the electrode assembly is provided in plurality on the working surface in the coal mine, and the electrode assembly includes an A electrode and a B electrode for power supply, and an M electrode and an N electrode for detection;

[0017] The end of the A electrode contacts the working surface, the B electrode is arranged on the line of the first electrode and connected to the transmitter, the C electrode is connected to the D electrode and contacts the working surface, and is connected to the acquisition card.

[0018] Furthermore, the electrode assembly is connected to a local terminal via a micro host.

[0019] Furthermore, the local terminal is also used to calculate the resistivity of each electrode assembly through the collected receiving voltage and transmitting current.

[0020] Furthermore, the resistivity is obtained by the following formula:

[0021]

[0022] Where: is the measured resistivity, ΔU MN is the receiving voltage of M electrode and N electrode, I is the transmitting current, K AMN is the proportionality constant;

[0023] in:

[0024]

[0025] Wherein: AM is the distance between the A electrode and the M electrode, AN is the distance between the A electrode and the N electrode, and MN is the distance between the M electrode and the N electrode.

[0026] A second aspect of the present invention provides a monitoring method, which is applied to a coal mine working face electrical real-time monitoring system as described in the first aspect, and comprises the following steps:

[0027] S1: After determining the monitoring position, check whether each electrode assembly is online;

[0028] S2: Start each electrode assembly to a working state;

[0029] S3: Sending a transmission instruction to the transmitter, and the transmitter transmits a current signal to the electrode assembly according to the set generation frequency and voltage;

[0030] S4: The acquisition card collects the receiving voltage of each electrode component and the transmitting current of the transmitter, and transmits them to the local terminal;

[0031] S5: The local terminal calculates the resistivity measured by each electrode assembly and uploads it to the remote terminal;

[0032] S6: Compare the measured resistivity with the resistivity of the geological material at the working surface to determine whether there is any abnormality.

[0033] Compared with the prior art, the present invention has the following advantages:

[0034] In the present invention, the electrode assembly is arranged in the tunnel formed in the working face of the mine, and the entire mining process of the working face can be monitored. Remote control is performed through the local terminal to obtain data from the electrode assembly to locate the spatial locations of water inrush hazards such as water channels, hidden structures, and crack-dense zones behind the goaf. The accuracy of abnormal areas can also be improved by changing the power supply current during monitoring. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] The accompanying drawings constituting a part of the present invention are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the accompanying drawings:

[0036] Figure 1 It is an overall schematic diagram of the present invention;

[0037] Figure 2 is a schematic diagram of an electrode assembly of the present invention;

[0038] Figure 3 Schematic diagram of the monitoring method of the present invention. DETAILED DESCRIPTION

[0039] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments may be combined with each other.

[0040] In the description of the present invention, it should be noted that the directions or positional relationships indicated by the terms "upper", "lower", "inner", "back", etc. are based on the directions or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0041] In addition, in the description of the present invention, unless otherwise clearly defined, the terms "installed", "connected", "connected", and "connector" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be the internal communication of two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood in combination with specific circumstances.

[0042] The following will refer to the attached Figures 1 to 3 The present invention is described in detail with reference to embodiments.

[0043] Example 1

[0044] In general, the present invention relates to a real-time electrical monitoring system for a coal mine working face, comprising a remote terminal, a local terminal and an underground acquisition system;

[0045] Among them, the underground acquisition module is used to collect, process and transmit data changes of the working face and goaf in the coal mine; the local terminal is used to transmit the data collected by the underground acquisition module to the remote terminal; the remote terminal is used to analyze and organize the transmitted data, perform imaging analysis, and observe abnormalities;

[0046] In this embodiment, the downhole acquisition module can collect data from the working face, transmit the data to the local terminal for processing, and then upload it to the remote terminal for analysis to determine whether any abnormality occurs in the working face area.

[0047] The downhole acquisition module includes a downhole host, an acquisition card, a transmitter, and an electrode assembly;

[0048] The electrode assembly is used to measure various data of the working face in the coal mine; the underground host is used to receive the signal from the local terminal and feed the data back to the local terminal while also being able to control the opening and closing of the electrode assembly; the transmitter is used to receive the signal from the underground host and output an electrical signal of a preset frequency and a preset voltage value to the electrode assembly; the acquisition card is used to collect the transmitting current of the transmitter and the receiving voltage of the electrode assembly.

[0049] During the specific implementation, first, the local terminal communicates with the transmitter through the USB serial port to set the transmission frequency and transmission voltage in the transmitter; then, the local terminal controls the electrode assembly to be connected to the transmission line in the bus to put it into the transmission state, and similarly connects the electrode assembly to the receiving line in the bus to put it into the receiving state; then, the local terminal controls the transmission system to work, and inputs the electrical signal into the transmission line in the bus through the transmitter according to the pre-set transmission frequency and transmission voltage; finally, the local terminal controls the acquisition card to collect data through the TCP / IP protocol, and the collected information including the transmission current and receiving voltage is processed and sent to the remote terminal.

[0050] like Figure 2 As shown, it should be noted that multiple electrode assemblies are arranged on the working surface in the coal mine, and the electrode assembly includes A electrode and B electrode for power supply, M electrode and N electrode for detection; the end of the A electrode is in contact with the working surface, the B electrode is arranged on the line of the first electrode and connected to the transmitter, the C electrode and the D electrode are connected and in contact with the working surface, and are connected to the acquisition card.

[0051] It should be further explained that the electrode assembly is connected to the local terminal through the micro host, which can facilitate the local terminal to better locate the corresponding electrode assembly. For example, encoding each electrode assembly is convenient for subsequent data aggregation and management.

[0052] The A electrode is a power supply electrode used to transmit electrical signals, and the B electrode is set away from the A electrode and used as a reference when collecting the current at the A electrode. The M electrode and the N electrode are monitoring electrodes used to receive the feedback voltage of the working surface.

[0053] After the acquisition card uploads the collected transmitting current and receiving voltage to the local terminal, the local terminal calculates the resistivity of the corresponding electrode assembly.

[0054] It should be further explained that the resistivity is obtained by the following formula:

[0055]

[0056] Where: is the measured resistivity, ΔU MN is the receiving voltage of M electrode and N electrode, I is the transmitting current, K AMN is the proportionality constant;

[0057] in:

[0058]

[0059] Wherein: AM is the distance between the A electrode and the M electrode, AN is the distance between the A electrode and the N electrode, and MN is the distance between the M electrode and the N electrode.

[0060] Through calculation, it is concluded that the resistivity of the electrode assembly is the resistivity of the midpoint between the M electrode and the N electrode. The resistivity of the midpoint is an annular equivalent resistivity range, which can be used for range detection with higher detection accuracy.

[0061] In summary, the electrode assembly is arranged in the tunnel formed in the working face of the mine, and the entire mining process of the working face can be monitored. The local terminal can be remotely controlled through Ethernet to obtain the data of the electrode assembly to locate the spatial location of water inrush hazards such as water channels, hidden structures, and crack-dense zones behind the demarcated goaf. The accuracy of abnormal areas can also be improved by changing the power supply current during monitoring.

[0062] Resistivity tomography technology can be used to three-dimensionally detect the spatial locations of water inrush hazards such as water channels, hidden structures, and densely populated fracture zones in mines.

[0063] In the present invention, after the system starts running, the remote terminal sends a verification instruction to the local terminal to determine whether each electrode is online. According to the control sequence, the relay of each electrode is set to the on state, and the acquisition card obtains the emission current and acquisition voltage data and sends them to the local terminal. After processing, the local terminal feeds back to the remote terminal, and the acquired data is saved in TXT format to form a complete set of measurement data. During the measurement process, the status of each electrode assembly can be displayed in the remote terminal operation interface of the software.

[0064] In this embodiment, after the remote terminal obtains the resistivity of each electrode assembly, it compares it with the resistivity of the geological material of the working surface to determine whether the working surface is abnormal. When the current flows vertically through a volume of unit length and unit cross-sectional area, the resistance value presented by the material in the volume is the resistivity of the material. As shown below:

[0065] The unit of resistivity (ρ) is ohm·meter, denoted as Ω·m.

[0066] The resistivity of coal is 30-1000Ω·m;

[0067] The resistivity of water is 0.2-1Ω·m;

[0068] The resistivity of mudstone is 10-100Ω·m;

[0069] The resistivity of sandstone is 100-1000Ω·m;

[0070] The resistivity of limestone is 300-10000Ω·m;

[0071] The resistivity of gravel is 600-10000Ω·m.

[0072] Example 2

[0073] The present invention also proposes a monitoring method, which is used in a coal mine working face electrical real-time monitoring system proposed in the above embodiment 1, such as Figure 3 As shown, the monitoring method comprises the following steps:

[0074] S1: After determining the monitoring position, check whether each electrode assembly is online;

[0075] S2: Start each electrode assembly to a working state;

[0076] S3: Sending a transmission instruction to the transmitter, and the transmitter transmits a current signal to the electrode assembly according to the set generation frequency and voltage;

[0077] S4: The acquisition card collects the receiving voltage of each electrode component and the transmitting current of the transmitter, and transmits them to the local terminal;

[0078] S5: The local terminal calculates the resistivity measured by each electrode assembly and uploads it to the remote terminal;

[0079] S6: Compare the measured resistivity with the resistivity of the geological material at the working surface to determine whether there is any abnormality.

[0080] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A coal mine working face electrical method real-time monitoring system, characterized by: Including remote terminal, local terminal and downhole acquisition system; The underground acquisition module is used to collect, process and transmit data changes of the working face and goaf in the coal mine; A local terminal is used to transmit the data collected by the downhole acquisition module to a remote terminal; Remote terminal, used for analyzing and collating the transmitted data, imaging analysis, and abnormal observation; The downhole acquisition module includes a downhole host, an acquisition card, a transmitter, and an electrode assembly; Electrode assembly, used to measure various data of the working face in the coal mine; The downhole host is used to receive signals from the local terminal and feed back data to the local terminal while also being able to control the opening and closing of the electrode assembly; A transmitter, used to receive a signal from a downhole host and output an electrical signal of a preset frequency and a preset voltage value to the electrode assembly; The acquisition card is used to collect the transmitting current of the transmitter and the receiving voltage of the electrode assembly.

2. A coal mine working face electrical method real-time monitoring system according to claim 1, characterized in that: The electrode assembly is provided in plurality on the working surface in the coal mine, and the electrode assembly includes an A electrode and a B electrode for power supply, and an M electrode and an N electrode for detection; The end of the A electrode contacts the working surface, the B electrode is arranged on the line of the first electrode and connected to the transmitter, the C electrode is connected to the D electrode and contacts the working surface, and is connected to the acquisition card.

3. A coal mine working face electrical method real-time monitoring system according to claim 2, characterized in that: The electrode assembly is connected to a local terminal via a micro host.

4. A coal mine working face electrical method real-time monitoring system according to claim 2, characterized in that: The local terminal is also used to calculate the resistivity of each electrode assembly through the collected receiving voltage and transmitting current.

5. A coal mine working face electrical method real-time monitoring system according to claim 4, characterized in that: The resistivity is given by the following formula: Where: is the measured resistivity, ΔU MN is the receiving voltage of M electrode and N electrode, I is the transmitting current, K AMN is the proportionality constant; in: Wherein: AM is the distance between the A electrode and the M electrode, AN is the distance between the A electrode and the N electrode, and MN is the distance between the M electrode and the N electrode.

6. A monitoring method, characterized in that: The monitoring method is applied to a coal mine working face electrical real-time monitoring system according to any one of claims 1 to 5, comprising the following steps: S1: After determining the monitoring position, check whether each electrode assembly is online; S2: Start each electrode assembly to a working state; S3: Sending a transmission instruction to the transmitter, and the transmitter transmits a current signal into the electrode assembly according to the set generation frequency and voltage; S4: The acquisition card collects the receiving voltage of each electrode component and the transmitting current of the transmitter, and transmits them to the local terminal; S5: The local terminal calculates the resistivity measured by each electrode assembly and uploads it to the remote terminal; S6: Compare the measured resistivity with the resistivity of the geological material at the working surface to determine whether there is any abnormality.

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