Underground coal mine double wireless network system

Abstract

The invention relates to an underground coal mine dual-wireless network system, which comprises a receiver and a plurality of terminal nodes, wherein each terminal node comprises a plurality of sensors for acquiring information data; the receiver is networked with all the terminal nodes to form a main wireless network and an auxiliary wireless network; the receiver sends a subscription instruction; in response to the subscription instruction, the terminal node transmits the information data to the receiver through the main wireless network; when the main wireless network between a certain terminal node and the receiver cannot be connected, the receiver controls to be switched to an auxiliary wireless network to be in communication connection with the terminal node by using the node information recorded during networking; meanwhile, triggering a reconnection mechanism of the main wireless network; and after the receiver is successfully reconnected with the terminal node through the main wireless network, the terminal node is reswitched to the main wireless network to transmit the information data. The double-wireless-network system can meet the requirement for high-reliability information data transmission under the coal mine.

Description

Technical Field

[0001] This invention belongs to the field of coal mining technology, specifically relating to a dual wireless network system for underground coal mines. Background Technology

[0002] Sensors installed in underground coal mines are traditionally connected via wired connections. This method is difficult to implement, costly, and difficult to maintain. Its scalability is limited by the interface of the controller or other access devices. Furthermore, wired sensors require data cables of different lengths depending on the scenario. In addition, some special locations cannot effectively install wired sensors, leading to inconvenience in application.

[0003] Subsequently, the self-organizing, easily expandable, unrestricted node, and low-power design of wireless sensor networks reduced maintenance costs, overcoming the shortcomings of wired sensors. Wireless sensor networks began to be widely used in underground coal mines, where each wireless sensor transmits the collected data through a wireless network. However, wireless networks are prone to disconnection and cannot self-repair in a timely manner, requiring manual troubleshooting, which is labor-intensive. Summary of the Invention

[0004] The purpose of this invention is to provide a dual wireless network system for underground coal mines to solve the problem of unstable communication in existing wireless network systems.

[0005] To solve the above problems, the underground dual wireless network system for coal mines involved in this invention adopts the following technical solution:

[0006] A dual wireless network system for underground coal mines includes a receiver and multiple terminal nodes, each of which includes multiple sensors for collecting information data; the receiver and all terminal nodes are networked to form a main wireless network and an auxiliary wireless network;

[0007] The receiver sends a subscription instruction;

[0008] In response to the subscription instruction, the terminal node transmits the information data to the receiver via the main wireless network;

[0009] When a terminal node cannot connect to the primary wireless network of the receiver, the receiver uses the node information recorded during network setup to control the switch to the secondary wireless network to establish a communication connection with the terminal node; at the same time, it triggers the reconnection mechanism of the primary wireless network.

[0010] After the receiver successfully reconnects to the terminal node via the main wireless network, the terminal node switches back to the main wireless network to transmit the information data.

[0011] In some embodiments, when the terminal node and the receiver form a network, the network parameters of the receiver and each terminal node are configured individually; the network parameters include network ID and channel.

[0012] In some embodiments, the network parameters of the receiver and each terminal node are configured individually using a terminal device, including:

[0013] The terminal device actively senses the wireless device; the wireless device includes a receiver and a terminal node.

[0014] The terminal device connects to each wireless device sequentially via Bluetooth;

[0015] Configure network parameters for each wireless device individually to enable the receiver to form a network connection with the terminal node.

[0016] In some embodiments, the primary wireless network is an OpenThread network, and the secondary wireless network is Bluetooth.

[0017] In some embodiments, both the receiver and the terminal node use an NRF51840 chip as their CPU.

[0018] In some embodiments, both the receiver and the terminal node include an antenna and an indicator light;

[0019] The antenna is used to transmit or receive radio waves;

[0020] The indicator lights are used to indicate the operating status of the receiver and terminal nodes.

[0021] In some embodiments, the receiver periodically receives information data from terminal nodes. If no information data is received from a terminal node within a preset time, it is determined that the terminal node cannot be connected.

[0022] The beneficial effects of this invention are as follows:

[0023] The present invention relates to a dual wireless network system for underground coal mines, which forms a main wireless network and an auxiliary wireless network between the receiver and the terminal node. The main wireless network is responsible for the communication transmission between each terminal node and the receiver, while the auxiliary wireless network serves as a backup network. When the main wireless network fails to connect, it immediately switches to continue transmitting information data. Compared with single-network reconnection, this system ensures the continuity and reliability of application layer information data transmission, making it suitable for the high reliability requirements of underground coal mines. Attached Figure Description

[0024] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the embodiments will be briefly described below:

[0025] Figure 1 This is a schematic diagram of the principle structure of a dual wireless network system in an underground coal mine according to an embodiment of the present invention;

[0026] Figure 2 This is a schematic diagram of a dual wireless network system in an underground coal mine according to an embodiment of the present invention;

[0027] Figure 3 This is a network diagram of terminal nodes and receivers in an embodiment of the present invention. Detailed Implementation

[0028] To make the technical objectives, technical solutions, and beneficial effects of the present invention clearer, the technical solutions of the present invention will be further described below in conjunction with the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described herein are only for explaining the present invention and are not intended to limit the present invention; that is, the described embodiments are merely some embodiments of the present invention, and not all embodiments. The components of the embodiments of this application described and shown in the accompanying drawings can generally be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of this application provided in the accompanying drawings is not intended to limit the scope of the claimed application, but merely represents selected embodiments of the present application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application.

[0029] In the following text, the terms "comprising," "having," and their cognates, which may be used in various embodiments of this application, are intended only to indicate a particular feature, number, step, operation, element, component, or combination thereof, and should not be construed as primarily excluding the presence of one or more other features, numbers, steps, operations, elements, components, or combinations thereof, or adding the possibility of one or more combinations thereof. Furthermore, the terms "first," "second," "third," etc., are used only for distinguishing descriptions and should not be construed as indicating or implying relative importance.

[0030] Unless otherwise specified, all terms used herein (including technical and scientific terms) shall have the same meaning as commonly understood by one of ordinary skill in the art to which the various embodiments of this application pertain. Terms (such as those defined in commonly used dictionaries) shall be interpreted as having the same meaning as in their contextual meaning in the relevant technical field and shall not be construed as having an idealized or overly formal meaning, unless clearly defined in the various embodiments of this application.

[0031] The following detailed description of some embodiments of this application is provided in conjunction with the accompanying drawings. Unless otherwise specified, the following embodiments and features can be combined with each other.

[0032] Underground wireless networks in coal mines primarily use Bluetooth for transmission. This protocol has a limited number of nodes, typically supporting a maximum of eight external devices stably, which may not be sufficient for situations with multiple wireless devices or a single access point. Furthermore, single-transmission networks suffer from unstable data transmission and automatically disable wireless maintenance functions after network setup, leading to operational and management problems and hindering convenient maintenance. Therefore, this invention proposes a dual-wireless network system adapted for underground coal mines to address the problems of single-wireless networks, while also improving the stability, maintainability, and number of access nodes for wireless network data transmission.

[0033] The following describes the dual wireless network system in the coal mine using specific embodiments.

[0034] like Figure 1 The diagram illustrates the principle and structure of a dual wireless network system in an underground coal mine. The system includes a receiver and multiple terminal nodes. Each terminal node includes multiple sensors for collecting information data. The receiver and all terminal nodes form a network to create a main wireless network and an auxiliary wireless network. The receiver sends a subscription command. In response to the subscription command, the terminal node transmits the information data to the receiver via the main wireless network. When a terminal node cannot connect to the receiver via the main wireless network, the receiver uses node information recorded during network setup to control a switch to the auxiliary wireless network to establish a communication connection with the terminal node. Simultaneously, a reconnection mechanism is triggered in the main wireless network. After the receiver successfully reconnects to the terminal node via the main wireless network, the terminal node switches back to the main wireless network to transmit the information data.

[0035] This invention relates to a dual wireless network system for underground coal mines. A primary wireless network handles communication between each terminal node and the receiver, while an auxiliary wireless network serves as a backup. If the primary wireless network becomes unavailable, the system immediately switches to resume data transmission. Compared to single-network reconnection, this ensures the continuity and reliability of application-layer data transmission. Therefore, this invention, designed for high-reliability applications in underground coal mines, significantly improves the reliability of data transmission through dual wireless network redundancy.

[0036] In this embodiment of the invention, the dual wireless network system requires normal power supply to the terminal nodes and receivers to ensure the normal operation of the dual wireless network system.

[0037] In embodiments of the present invention, such as Figure 2As shown, both the receiver and the terminal node use the NRF51840 chip as their CPU. The motherboard based on the NRF51840 chip has two wireless networks: OpenThread and Bluetooth. Therefore, in this embodiment, the main wireless network is the OpenThread network, and the auxiliary wireless network is Bluetooth. Both the receiver and the terminal node formed based on the NRF51840 chip used by the CPU include an antenna and indicator lights. The antenna is used to transmit or receive radio waves, and the indicator lights are used to indicate the operating status of the receiver and the terminal node.

[0038] The dual wireless network system of the present invention includes, but is not limited to, OpenThread and Bluetooth, and can also be implemented through other network methods, such as UWB + Bluetooth.

[0039] This invention implements OpenThread and Bluetooth communication through a single NRF51840 module, but it can also be implemented using two chips providing different networks.

[0040] In this embodiment of the invention, when the terminal node and the receiver form a network, a terminal device (e.g., a mobile phone) is used to configure the network parameters of the receiver and each terminal node individually; for example... Figure 3 The diagram shows the network topology of each terminal node and receiver; the specific networking process of the receiver and the terminal node's OpenThread network includes:

[0041] (1) Using a terminal device to actively sense a wireless device; the wireless device includes a receiver and a terminal node;

[0042] (2) The terminal device connects to each wireless device sequentially via Bluetooth;

[0043] (3) Configure network parameters for each wireless device individually to enable the receiver to form a network connection with the terminal node.

[0044] For example, when the wireless network system is working properly, the receiver uses a custom protocol to send subscription instructions for information data to the terminal node. The terminal node will use the OpenThread network to transmit information data according to the corresponding reporting rules. If the main wireless network (OpenThread network) goes offline, the auxiliary wireless network (Bluetooth) will be used to transmit information data, and the OpenThread network will be started to reconnect and restore the connection.

[0045] In this embodiment of the invention, the configured network parameters include not only network ID and channel, but also system, number, and other information. By configuring these network parameters, terminal nodes and receiving ends can form an effective and accurate network.

[0046] In this embodiment of the invention, the determination that the main wireless network between the terminal node and the receiver cannot be connected includes:

[0047] The receiver periodically receives information data from terminal nodes. If it does not receive information data from a terminal node within a preset time, it determines that the terminal node cannot be connected and triggers a reconnection mechanism. At the same time, the receiver immediately uses the auxiliary wireless network (Bluetooth address, etc.) recorded within the network to connect to the terminal node, so as to resume the timely transmission of information data through the auxiliary wireless network, restore the uploading of information data, and complete the subscription command.

[0048] Specifically, the receiver uses the node information of the terminal node recorded during network setup to connect to the terminal node specified in the node information through the auxiliary network; simultaneously, it sends a reconnection command to the terminal node. Upon receiving the reconnection command, the terminal node restarts the main wireless network and reconnects with the receiver. Once the terminal device reconnects with the receiver through the main wireless network, it switches back to the main wireless network for communication.

[0049] Compared to existing single-network reconnection methods where data may be completely lost, this invention achieves uninterrupted data flow and improves data transmission reliability through dual wireless network collaborative communication.

[0050] The dual wireless network of this invention enables stable data transmission and allows for easy maintenance, thereby improving the stability and convenience of wireless sensing systems in underground applications. Furthermore, while enhancing data transmission stability, it also reduces maintenance and management costs, increases the number of access nodes, and ensures the reliability and effectiveness of underground wireless transmission.

[0051] Finally, it should be noted that the above embodiments are only for illustration and not for limiting the technical solutions of the present invention. Any equivalent substitutions, modifications or partial substitutions that do not depart from the spirit and scope of the present invention should be covered within the scope of protection of the claims of the present invention.

Claims

1. A dual wireless network system for underground coal mines, characterized in that, It includes a receiver and multiple terminal nodes, each of which includes multiple sensors for collecting information data; the receiver and all terminal nodes are networked to form a main wireless network and an auxiliary wireless network; The receiver sends a subscription instruction; In response to the subscription instruction, the terminal node transmits the information data to the receiver via the main wireless network; When a terminal node cannot connect to the primary wireless network of the receiver, the receiver uses the node information recorded during network setup to control the switch to the secondary wireless network to establish a communication connection with the terminal node; at the same time, it triggers the reconnection mechanism of the primary wireless network. After the receiver successfully reconnects to the terminal node via the main wireless network, the terminal node switches back to the main wireless network to transmit the information data.

2. The underground dual wireless network system for coal mines according to claim 1, characterized in that, When the terminal node and the receiver form a network, the network parameters of the receiver and each terminal node are configured individually; the network parameters include network ID and channel.

3. The underground dual wireless network system for coal mines according to claim 2, characterized in that, The network parameters of the receiver and each terminal node are configured individually using the terminal device, including: The terminal device actively senses the wireless device; the wireless device includes a receiver and a terminal node. The terminal device connects to each wireless device sequentially via Bluetooth; Configure network parameters for each wireless device individually to enable the receiver to form a network connection with the terminal node.

4. The underground dual wireless network system for coal mines according to claim 3, characterized in that, The main wireless network uses an OpenThread network, and the auxiliary wireless network uses Bluetooth.

5. The underground dual wireless network system for coal mines according to claim 4, characterized in that, Both the receiver and the terminal node use the NRF51840 chip as their CPU.

6. The underground dual wireless network system for coal mines according to claim 5, characterized in that, Both the receiver and the terminal node include an antenna and an indicator light; The antenna is used to transmit or receive radio waves; The indicator lights are used to indicate the operating status of the receiver and terminal nodes.

7. The underground dual wireless network system for coal mines according to claim 1, characterized in that, The receiver periodically receives information data from terminal nodes. If it does not receive information data from a terminal node within a preset time, it determines that the terminal node cannot be connected.

Images