Device and method for monitoring mining-induced stress of coal mine working face

Abstract

The invention relates to the field of coal mine safety monitoring, in particular to a coal mine working face mining-induced stress monitoring device and method.The device comprises a plurality of wireless sensing nodes, a wireless gateway and a monitoring center, and the wireless sensing nodes are distributed at different positions of a coal mine working face and used for collecting stress data of the positions in real time; the wireless gateway is used for performing wireless communication with each wireless sensing node, receiving the collected stress data and transmitting the stress data to the monitoring center; and the monitoring center is provided with a data processing system which is used for analyzing and processing the received stress data, generating a stress distribution diagram and sending out an early warning signal according to an analysis result. Multi-point communication is achieved, monitoring points can be interconnected and intercommunicated, comprehensive stress distribution data are obtained, and overall evaluation of mining-induced stress is facilitated; the reliability and availability of the system are improved, the redundancy and the error-tolerant rate are increased, the system can operate normally even if a fault occurs, and the monitoring continuity is ensured.

Description

Technical Field

[0001] The present invention relates to the field of coal mine safety monitoring, and in particular to a device and method for monitoring mining stress on a coal mine working face. Background Art

[0002] Coal mining is a complex geomechanical process. Coal mining operations can cause dramatic changes in the stress state of coal seams and surrounding rock formations. These stress changes not only affect the stability of the coal seams, but also exert tremendous pressure on the support structure of the goaf, posing serious safety hazards to the coal mining face. Therefore, accurate monitoring and evaluation of changes in mining stress is crucial to ensure safe production in coal mines.

[0003] Traditional mining stress monitoring methods mainly rely on manual observation and empirical judgment, which are highly subjective and lagging. With the development of modern testing technology, mining stress monitoring technology is also constantly evolving, and has gradually achieved automation, intelligence and real-time. At present, advanced equipment such as borehole stress gauges, stress analyzers, and acoustic inclinometers are mainly used, combined with digital acquisition systems and data analysis models, to conduct all-round and dynamic monitoring and evaluation of mining stress. However, the existing technology still has problems such as low monitoring accuracy, poor response ability, inability to achieve multi-point communication, and inability to achieve dynamic monitoring. It is difficult to comprehensively analyze the changing laws of mining stress, so that it is impossible to detect abnormal conditions in time, take effective prevention and control measures, and minimize the risks of coal mining.

[0004] Therefore, there is an urgent need for a new type of mining stress monitoring device that can improve monitoring accuracy, solve problems such as poor response capability, inability to achieve multi-point communication, and inability to achieve dynamic monitoring, so as to achieve comprehensive force analysis, avoid safety accidents, and improve the success rate, thereby ensuring the safety and efficiency of coal mining.

[0005] There are already some invention patents to improve the accuracy of mining stress monitoring, solve the problems of poor response ability, inability to achieve multi-point communication, and inability to achieve dynamic monitoring. For example:

[0006] CN109538297A discloses a coal seam mining stress integrated monitoring device, including a system host, a standby machine, a UPS backup power supply, a mining system interface and underground equipment. The device can monitor the dynamic changes of gas pressure, flow, and ground stress data in real time, and can also monitor the shape and material of the coal seam floor, and can collect the size and direction of mining cracks, and can perform whole-piece and single-piece strength detection of the coal seam floor, so that the force analysis is more comprehensive. However, the device cannot further improve the reliability and availability of the system, increase redundancy and fault tolerance, and ensure that the system can still operate normally when a fault occurs.

[0007] CN110823426A discloses a device and method for monitoring the dynamic stress of coal mining face under hard rock environment, including a monitoring tube with a hollow structure, and a plurality of thin film resistance strain gauges are arranged at intervals on two sides along the length direction of the monitoring tube. The device is to send the monitoring tube with thin film resistance strain gauge into the monitoring borehole at an angle of 40 to 60 degrees with the horizontal direction, and then inject cement slurry, and after the cement slurry is completely hardened, the dynamic real-time monitoring of the overlying rock strata of the coal mining face is carried out, and the monitoring data is highly accurate and timely. However, when determining the number and arrangement of monitoring tubes, the device cannot further consider the distribution of monitoring points and the distribution of mining stress to improve the accuracy of stress monitoring.

[0008] In general, the existing technology has the following shortcomings: 1. The monitoring accuracy is not high, and it is difficult to accurately obtain the changes in mining stress, and it is impossible to detect abnormal situations in time, take effective prevention and control measures, and minimize the risks of coal mining; 2. The response ability is poor, and it is impossible to monitor the dynamic changes of mining stress in real time, resulting in lagging monitoring data and unable to reflect the actual situation in time; 3. It is impossible to achieve multi-point communication, the monitoring points cannot be interconnected, and comprehensive stress distribution data cannot be obtained, which affects the overall assessment of mining stress; 4. Dynamic monitoring cannot be achieved, and the monitoring strategy cannot be adjusted in time according to the advancement of the coal mining face, resulting in the existence of monitoring blind spots; 5. The system reliability and availability are insufficient, and the redundancy and fault tolerance are low. Once a failure occurs, the system will not be able to operate normally, affecting the continuity of monitoring. Summary of the invention

[0009] In view of this, the purpose of the present invention is to provide a coal mine working face mining stress monitoring device to solve the problems existing in the prior art such as low monitoring accuracy, poor response capability, inability to achieve multi-point communication, and inability to achieve dynamic monitoring.

[0010] In order to achieve the above object, the present invention provides the following technical solutions:

[0011] A coal mine working face mining stress monitoring device, comprising a plurality of wireless sensor nodes, a wireless gateway and a monitoring center, wherein the wireless sensor nodes are distributed at different positions of the coal mine working face and are used to collect stress data of the position in real time;

[0012] The wireless gateway is used to wirelessly communicate with each wireless sensor node, receive the collected stress data and transmit it to the monitoring center;

[0013] The monitoring center is provided with a data processing system for analyzing and processing the received stress data, generating a stress distribution diagram, and issuing an early warning signal according to the analysis result.

[0014] Furthermore, the wireless sensor node is composed of a stress sensor, a data acquisition module, a wireless communication module and a power module;

[0015] The stress sensor is used to collect stress data at its location in real time and transmit it to the data acquisition module. The data acquisition module performs A / D conversion on the collected analog data to obtain digital data and transmits it to the wireless communication module. The wireless communication module transmits the digital data to the wireless gateway wirelessly. The power supply module is used to provide power to the stress sensor, the data acquisition module and the wireless communication module.

[0016] Furthermore, the distance between two adjacent wireless sensor nodes is controlled within 100 meters.

[0017] Furthermore, the monitoring center is provided with a data processing system, which includes an industrial computer and a large-screen display, and is used to analyze and process the received stress data, generate a stress distribution diagram, and issue a warning signal according to the analysis results.

[0018] A method for monitoring mining stress of a coal mine working face, using the above-mentioned coal mine working face mining stress monitoring device, specifically comprises the following steps:

[0019] Step 1: The stress sensor in the wireless sensor node collects stress data at the location in real time, and the data acquisition module performs A / D conversion on the collected analog data to obtain digital data;

[0020] Step 2: The wireless communication module transmits the digital data to the wireless gateway wirelessly. The wireless gateway receives the data from each wireless sensor node and transmits it to the data processing system of the monitoring center through a wired network.

[0021] Step 3: The stress analysis software in the industrial computer analyzes and processes the received stress data to obtain the stress distribution of the entire working surface, and calculates the actual stress value of each position based on the stress distribution. The stress analysis software displays the calculated stress distribution in the form of an image on a large-screen display for monitoring personnel to view.

[0022] The beneficial effects of the present invention are:

[0023] 1. Multi-point communication is realized, and the monitoring points can be interconnected to obtain comprehensive stress distribution data, which is conducive to the overall evaluation of mining stress; dynamic monitoring is realized, and the monitoring strategy can be adjusted in time according to the progress of the coal mining face to avoid the existence of monitoring blind spots; the reliability and availability of the system are improved, and the redundancy and fault tolerance are increased. Even if a fault occurs, the system can still operate normally to ensure the continuity of monitoring.

[0024] 2. The accuracy of mining stress monitoring has been improved, and the changes in mining stress can be accurately obtained, abnormal situations can be discovered in time, and effective prevention and control measures can be taken to minimize the risks of coal mining; the monitoring response ability has been improved, and the dynamic changes of mining stress can be monitored in real time, and the monitoring data can reflect the actual situation in a timely manner.

[0025] Other advantages, objectives and features of the present invention will be described in the following description to some extent, and to some extent, will be obvious to those skilled in the art based on the following examination and study, or can be taught from the practice of the present invention. The objectives and other advantages of the present invention can be realized and obtained through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to make the purpose, technical solutions and advantages of the present invention more clear, the present invention will be described in detail below in conjunction with the accompanying drawings, wherein:

[0027] Figure 1 It is a structural schematic diagram of a coal mine working face mining stress monitoring device in the present invention.

[0028] Figure numerals: monitoring center 1, wireless gateway 2, wireless sensor node 3, stress sensor 31, data acquisition module 32, wireless communication module 33, power supply module 34. DETAILED DESCRIPTION

[0029] The following describes the embodiments of the present invention by specific examples, and those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments, and the details in this specification can also be modified or changed in various ways based on different viewpoints and applications without departing from the spirit of the present invention. It should be noted that the illustrations provided in the following embodiments only illustrate the basic concept of the present invention in a schematic manner, and the following embodiments and features in the embodiments can be combined with each other without conflict.

[0030] Among them, the drawings are only used for illustrative explanations, and they only represent schematic diagrams rather than actual pictures, and should not be understood as limitations on the present invention. In order to better illustrate the embodiments of the present invention, some parts of the drawings may be omitted, enlarged or reduced, and do not represent the size of actual products. For those skilled in the art, it is understandable that some well-known structures and their descriptions in the drawings may be omitted.

[0031] The same or similar numbers in the drawings of the embodiments of the present invention correspond to the same or similar parts; in the description of the present invention, it should be understood that if the terms "upper", "lower", "left", "right", "front", "rear", etc. indicate the orientation or position relationship, they are based on the orientation or position relationship shown in the drawings, which is 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 orientation, be constructed and operate in a specific orientation. Therefore, the terms describing the position relationship in the drawings are only used for illustrative purposes and cannot be understood as limiting the present invention. For ordinary technicians in this field, the specific meanings of the above terms can be understood according to specific circumstances.

[0032] See also Figure 1 , is a mining stress monitoring device for coal mine working face. The device adopts a wireless distributed monitoring device, including multiple wireless sensor nodes 3, a wireless gateway 2 and a monitoring center 1. The wireless sensor node is composed of a stress sensor 31, a data acquisition module 32, a wireless communication module 33 and a power module 34, which are distributed at different positions of the coal mine working face and are used to collect stress data at the position in real time; specifically, the stress sensor is used to collect stress data at the position in real time and transmit it to the data acquisition module, the data acquisition module performs A / D conversion on the collected analog data, obtains digital data and transmits it to the wireless communication module, the wireless communication module transmits the digital data to the wireless gateway by wireless means, and the power module is used to provide power to the stress sensor, the data acquisition module and the wireless communication module. The wireless gateway 2 is used to communicate wirelessly with each wireless sensor node 3, receive the collected stress data and transmit it to the monitoring center 1. The monitoring center is provided with a data processing system, which is used to analyze and process the received stress data, generate a stress distribution map, and issue an early warning signal according to the analysis results.

[0033] The device adopts wireless transmission mode, which does not require the laying of a large number of cable lines and is easy to deploy in a narrow coal mine environment. Distributed monitoring can realize multi-point communication and obtain comprehensive stress distribution data, which is conducive to the overall evaluation of mining stress. The wireless sensor node 3 has an independent power supply module, which can work for a long time, realize dynamic monitoring, and adjust the monitoring strategy in time according to the advancement of the coal mining face. In addition, the device has a certain degree of redundancy and fault tolerance. When some nodes fail, other nodes can still work normally to ensure the continuity of monitoring.

[0034] Example 1

[0035] The present invention provides a coal mine working face mining stress monitoring device, which adopts a wireless distributed monitoring device and includes a plurality of wireless sensor nodes 3, a wireless gateway 2 and a monitoring center 1.

[0036] The wireless sensor node 3 is composed of a stress sensor 31, a data acquisition module 32, a wireless communication module 33 and a power module 34. The stress sensor is a drilling stress gauge, model YHY-60, with a measurement range of 0-60MPa and an accuracy of ±0.5%FS. The data acquisition module uses a 16-bit analog-to-digital conversion chip ADS1115, with a resolution of 16 bits and a sampling rate of 860sps; the wireless communication module uses an NRF24L01+ radio frequency chip, with an operating frequency of 2.4GHz and a communication distance of up to 100 meters; the power module is composed of two 18650 lithium batteries with a battery capacity of 3000mAh.

[0037] The wireless sensor nodes are distributed at different locations of the coal mine working face to collect stress data at the location in real time. The wireless gateway is an industrial-grade router, model UR326, which supports IEEE802.11a / b / g / n wireless standards and is used to communicate wirelessly with each wireless sensor node, receive the collected stress data and transmit it to the monitoring center through a wired network.

[0038] The monitoring center is equipped with a data processing system, including an industrial computer and a large-screen display. The industrial computer model is IPC-610L, configured with an Intel Core i5 processor, 8GB memory, 500GB solid-state hard drive, and runs Windows 10. The data processing system uses self-developed stress analysis software to analyze and process the received stress data, generate stress distribution diagrams, and issue warning signals based on the analysis results.

[0039] The working principle of the coal mine working face mining stress monitoring device provided by the present invention is as follows:

[0040] The stress sensor 31 in the wireless sensor node 3 collects stress data at the location in real time, and the data acquisition module 32 performs A / D conversion on the collected analog data to obtain digital data;

[0041] The wireless communication module 33 transmits the digital data to the wireless gateway 2 by wireless means. The wireless gateway 2 receives the data from each wireless sensor node 3 and transmits it to the data processing system of the monitoring center 1 through a wired network.

[0042] The stress analysis software in the data processing system analyzes and processes the received stress data, including steps such as data filtering, data fusion, and stress calculation. First, the original data is filtered to remove noise interference; then the data from different sensor nodes are fused to obtain the stress distribution of the entire working surface; finally, the actual stress value of each position is calculated based on the stress distribution.

[0043] The stress analysis software displays the calculated stress distribution in the form of an image on a large-screen display, and the monitoring personnel can view the stress changes of the working surface in real time. When the stress value of a certain area exceeds the preset threshold, the system will issue an early warning signal to remind people to take corresponding preventive measures.

[0044] In practical application, the coal mine working face mining stress monitoring device of the present invention can be deployed and used according to the following steps:

[0045] 1. Conduct on-site survey to determine the layout of wireless sensor nodes, and control the distance between each node within 100 meters;

[0046] 2. Install the wireless sensor node, drill holes in the coal seam or surrounding rock to form multiple test points for installing stress sensors, install the stress sensor 31 into the borehole in the coal seam or surrounding rock, and then grout the stress sensor 31 to connect with the borehole wall, and connect the data acquisition module, wireless communication module and power module;

[0047] 3. Set up a wireless gateway and place it in a suitable location near the work surface to ensure wireless connection with all wireless sensor nodes;

[0048] 4. Wiring connects the wireless gateway and the monitoring center, and can use wired network methods such as optical fiber or twisted pair;

[0049] 5. Install data processing system in monitoring center and deploy stress analysis software;

[0050] 6. Start the machine, enter the monitoring state, and check the stress distribution of the working surface in real time;

[0051] 7. Based on monitoring data, abnormal areas should be discovered in time and prevention and control measures such as support and reinforcement should be taken;

[0052] 8. As the working surface advances, adjust the position of the wireless sensor nodes in a timely manner to ensure the continuity of monitoring.

[0053] The coal mine working face mining stress monitoring device described in the present invention adopts a wireless transmission method, which does not require the laying of a large number of cable lines and is easy to deploy in a narrow coal mine environment. Distributed monitoring can achieve multi-point communication and obtain comprehensive stress distribution data. The wireless sensor node has an independent power supply module and can work for a long time to achieve dynamic monitoring. The device also has a certain degree of redundancy and fault tolerance. When some nodes fail, other nodes can still work normally to ensure the continuity of monitoring.

[0054] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solution of the present invention can be modified or replaced by equivalents without departing from the purpose and scope of the technical solution, which should be included in the scope of the claims of the present invention.

Claims

1. A coal mine working face mining stress monitoring device, characterized in that: It includes multiple wireless sensor nodes, wireless gateways and a monitoring center. The wireless sensor nodes are distributed at different locations of the coal mine working face and are used to collect stress data at the location in real time. The wireless gateway is used to wirelessly communicate with each wireless sensor node, receive the collected stress data and transmit it to the monitoring center; The monitoring center is provided with a data processing system for analyzing and processing the received stress data, generating a stress distribution diagram, and issuing an early warning signal according to the analysis result.

2. The coal mine working face mining stress monitoring device according to claim 1 is characterized in that: The wireless sensor node is composed of a stress sensor, a data acquisition module, a wireless communication module and a power module; The stress sensor is used to collect stress data at its location in real time and transmit it to the data acquisition module. The data acquisition module performs A / D conversion on the collected analog data to obtain digital data and transmits it to the wireless communication module. The wireless communication module transmits the digital data to the wireless gateway wirelessly. The power supply module is used to provide power to the stress sensor, the data acquisition module and the wireless communication module.

3. The coal mine working face mining stress monitoring device according to claim 2 is characterized in that: The distance between two adjacent wireless sensor nodes is controlled within 100 meters.

4. The coal mine working face mining stress monitoring device according to claim 3 is characterized by: The monitoring center is provided with a data processing system, which includes an industrial computer and a large-screen display, and is used to analyze and process the received stress data, generate a stress distribution diagram, and issue an early warning signal according to the analysis result.

5. A method for monitoring mining stress of a coal mine working face, characterized in that: The coal mine working face mining stress monitoring device according to claim 4 specifically comprises the following steps: Step 1: The stress sensor in the wireless sensor node collects stress data at the location in real time, and the data acquisition module performs A / D conversion on the collected analog data to obtain digital data; Step 2: The wireless communication module transmits the digital data to the wireless gateway wirelessly. The wireless gateway receives the data from each wireless sensor node and transmits it to the data processing system of the monitoring center through a wired network. Step 3: The stress analysis software in the industrial computer analyzes and processes the received stress data to obtain the stress distribution of the entire working surface, and calculates the actual stress value of each position based on the stress distribution. The stress analysis software displays the calculated stress distribution in the form of an image on a large-screen display for monitoring personnel to view.

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