Underground coal mine working face sensor continuous line and non-broken line-based operation method

Abstract

The invention relates to the technical field of coal mine safety, and particularly discloses a coal mine underground working face sensor continuous line unbroken operation method, which comprises the following steps of: S1, when a coal face is stoped to a preset distance, continuously connecting a monitoring cable between a second junction box and a third junction box; according to the invention, through the operation process of connecting the new cable between the junction boxes, connecting the new cable to the standby interface and then dismounting the old cable, continuous power supply and signal transmission of the sensor in the cable recovery process are realized, and the problem of power failure of the sensor caused by directly dismounting the old cable in the traditional operation is avoided; therefore, unplanned power failure caused by system fault locking is prevented, continuity and safety of underground coal mining work are guaranteed, meanwhile, operation is carried out strictly according to the sequence of first connection, then disassembly and first power supply and then signal, the risk of electrical short circuit caused by misoperation is remarkably reduced, and higher safety guarantee is provided for underground operation.

Description

Technical Field

[0001] The present invention belongs to the technical field of coal mine safety, and particularly relates to an operation method for continuously connecting the sensor cables in the coal mine underground working face without interrupting the line. Background Technique

[0002] In the field of coal mine safety production, the problems of cable connection and disconnection of sensors in the underground working face have always been key factors affecting production efficiency and safety. With the continuous progress of coal mining technology, the safety monitoring system has become an indispensable part of modern coal mines. It provides important guarantee for safe production through real-time monitoring of underground environmental parameters. However, there are many deficiencies in the traditional method of connecting sensor cables, especially in the complex and changeable underground environment, these problems are particularly prominent.

[0003] The traditional method of connecting sensor cables in the coal mine underground working face usually adopts the operation mode of directly removing the old cable and connecting the new cable. During this operation, the sensor is often powered off briefly, which may cause the system to malfunction and lock, resulting in unplanned power outages and seriously affecting the continuity and safety of underground coal mining work. In addition, due to the harsh underground environment, the cable is easily affected by factors such as moisture and corrosion. Directly removing the old cable not only increases the operation difficulty but also easily causes safety hazards such as electrical short circuits. More seriously, the traditional cable connection method lacks standardized operation procedures and strict wiring sequences, resulting in uneven wiring quality and further increasing the risk of cable disconnection and signal attenuation. These problems not only increase the equipment maintenance cost but also reduce the reliability and stability of the safety monitoring system. Therefore, it is necessary for the staff to improve it. Summary of the Invention

[0004] The purpose of the present invention is to provide an operation method for continuously connecting the sensor cables in the coal mine underground working face without interrupting the line to solve the problems mentioned in the above background technique.

[0005] To achieve the above purpose, the present invention provides the following technical solutions:

[0006] An operation method for continuously connecting the sensor cables in the coal mine underground working face without interrupting the line includes the following steps:

[0007] Operation process for recycling the cable:

[0008] S1. When the coal mining face is mined to a predetermined distance, connect the monitoring and control cable between the No. 2 junction box and the No. 3 junction box;

[0009] S2. Connect the two ends of the connecting cable to the B interfaces of the No. 2 junction box and the No. 3 junction box respectively. First, connect the B interface of the No. 2 junction box, and then connect the B interface of the No. 3 junction box;

[0010] S3. The wiring sequence is as follows: Connect the green wire (signal negative) to terminal B1, the blue wire (signal positive) to terminal B2, the white wire (power negative) to terminal B3, and the red wire (power positive) to terminal B4;

[0011] S4. After the continued cable is firmly fastened, remove the original connecting wire ③ between the No. 2 junction box and the No. 3 junction box;

[0012] S5. The wire removal sequence is as follows: red wire (power positive), white wire (power negative), blue wire (signal positive), green wire (signal negative);

[0013] Operation process of continued cable:

[0014] S1. When the working face needs to extend the monitoring cable forward, connect the line composed of No. ④ wire, No. 4 junction box and No. ⑤ wire between the No. 2 junction box and the No. 3 junction box;

[0015] S2. Connect the two ends of the continued line to the B interfaces of the No. 2 junction box and the No. 3 junction box respectively. First connect the B interface of the No. 2 junction box, and then connect the B interface of the No. 3 junction box;

[0016] S3. The wiring sequence is as follows: Connect the green wire (signal negative) to terminal B1, the blue wire (signal positive) to terminal B2, the white wire (power negative) to terminal B3, and the red wire (power positive) to terminal B4;

[0017] S4. After the continued cable is firmly fastened, remove the original connecting wire ③ between the No. 2 junction box and the No. 3 junction box;

[0018] S5. The wire removal sequence is as follows: red wire (power positive), white wire (power negative), blue wire (signal positive), green wire (signal negative).

[0019] Preferably, when continuing the cable, remove the outer skin and shielding layer of the monitoring cable according to the used length. Pass the cable through the bellmouth, retaining ring and sealing ring in sequence. After fastening the bellmouth, strip the insulation layer in sequence and connect to the corresponding terminal.

[0020] Preferably, when removing the cable, first ensure that the continued cable is firmly connected, then remove the original connecting wire in sequence, use wire cutters to cut off the exposed wire core, and finally loosen the bellmouth to take out the monitoring cable and restore the sealing structure.

[0021] Preferably, the method further includes reserving a junction box in advance at the sensor end to avoid wire breakage caused by continued wiring and wire collection.

[0022] Compared with the prior art, the beneficial effects of the present invention are:

[0023] (1) Through the operation process of first connecting a new cable between junction boxes and connecting it to the spare interface and then removing the old cable, continuous power supply and signal transmission of the sensor during the cable recovery process are achieved, avoiding the problem of sensor power failure caused by directly removing the old cable in traditional operations, thereby preventing unplanned power outages caused by system fault locking, ensuring the continuity and safety of underground coal mining work. At the same time, strictly operating in the order of connecting first and then disconnecting, and first power supply and then signal, significantly reduces the risk of electrical short circuit caused by improper operation, providing higher safety protection for underground operations.

[0024] (2) Through the design of pre-installing segmented lines and using double-interface junction boxes, seamless extension of the monitoring cable is achieved when the working face advances forward, eliminating the inevitable sensor wire breakage phenomenon in traditional cable connection methods, ensuring the real-time and integrity of the data of the safety monitoring system. It not only solves the technical problem of monitoring signal interruption, but also greatly improves the operation efficiency, reducing equipment damage and maintenance time caused by improper operation.

[0025] (3) By pre-reserving a junction box at the sensor end, continuous wire monitoring of the sensor from the roadway excavation to the completion of tunneling is achieved, fundamentally solving the signal attenuation and wire breakage risks caused by multiple cable connections in long-distance roadways, providing continuous and reliable monitoring protection for coal mine safety production. The scheme of reserving the junction box not only optimizes the system architecture, but also simplifies the later maintenance work, laying a solid foundation for the construction of intelligent mines. Description of the Drawings

[0026] Figure 1 It is a flowchart of the method of the present invention. Detailed Embodiments

[0027] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0028] Embodiment 1:

[0029] Please refer to Figure 1 As shown, an operation method for continuous wire connection of sensors in a coal mine underground working face includes the following steps:

[0030] Operation process of cable recovery

[0031] S1: When the coal mining face has mined 100 meters, 100 meters of monitoring and control cable needs to be recovered. First, connect 10 meters of monitoring and control cable between the No. 2 junction box and the No. 3 junction box;

[0032] S2: Connect both ends of the extension cable to the B interfaces of Junction Box 2 and Junction Box 3 respectively. First connect to the B interface of Junction Box 2, and then to the B interface of Junction Box 3, ensuring the correct operation sequence.

[0033] S3: The wiring sequence must strictly follow:

[0034] Green wire (signal negative) → Terminal B1

[0035] Blue wire (signal positive) → Terminal B2

[0036] White wire (power negative) → Terminal B3

[0037] Red wire (power positive) → Terminal B4;

[0038] S4: After the extension cable is firmly fastened, remove the original connecting wire ③.

[0039] S5: The order of wire removal is:

[0040] Red wire (power positive) → White wire (power negative) → Blue wire (signal positive) → Green wire (signal negative)

[0041] After removal, use wire cutters to cut off the exposed wire cores to prevent short circuits.

[0042] Operation process of extension cable

[0043] S1: When the working face needs to extend the monitoring cable by 100 meters, connect the line composed of Line ④, Junction Box 4 and Line ⑤ between Junction Box 2 and Junction Box 3.

[0044] S2: Connect both ends of the extension line to the B interfaces of Junction Box 2 and Junction Box 3 respectively. First connect to the B interface of Junction Box 2, and then to the B interface of Junction Box 3.

[0045] S3: The wiring sequence is the same as the recovery process (green → blue → white → red).

[0046] S4: After the extension cable is fastened, remove the original connecting wire ③.

[0047] S5: The order of wire removal is the same as the recovery process (red → white → blue → green).

[0048] When extending the cable: Cut the cable as needed, remove the outer skin and shielding layer, pass the cable through the bell mouth, retaining ring and sealing ring in sequence, fasten the bell mouth, strip the insulation layer in sequence and connect to the corresponding terminal, ensuring good contact.

[0049] When removing the cable: Confirm that the new cable is firmly connected before removing the old cable. Remove the wires in sequence (power first and then signal), and cut off the exposed wire cores. After removing the old cable, restore the sealing structure (sealing ring + retaining ring + bell mouth).

[0050] Reserve a junction box in advance at the sensor end to avoid wire breakage caused by multiple continuations / recoveries.

[0051] Adopt a dual-interface junction box (A / B interfaces) to ensure uninterrupted signals when switching between old and new cables.

[0052] Embodiment 2:

[0053] Please refer to Figure 1 As shown, in an ultra-long roadway (such as a fully-mechanized mining face or a drivage roadway over 2000 meters), the traditional single-section cable continuation method may lead to signal attenuation, difficult maintenance, and there is still a risk of wire breakage with frequent continuations. Therefore, an optimized layout scheme of sectional junction boxes is proposed, combined with the cable continuation method of Embodiment 1, to achieve the stable operation of an ultra-long distance monitoring system.

[0054] Junction box distribution scheme: Along the roadway direction, set a main junction box (numbered J1, J2, J3... Jn) every 200 meters as a sectional control node. Each main junction box adopts a dual-channel design (A / B interfaces), supports hot switching between old and new cables, and the main junction boxes are connected by high-strength shielded cables to reduce signal interference and voltage drop.

[0055] Sensor grouping management: Sensors (such as methane, CO, wind speed, etc.) within a range of 200 meters per section are connected to the A interface (permanent line) of the corresponding main junction box, and the B interface is used as a spare continuation channel for switching during cable extension or recovery.

[0056] Initial wiring stage

[0057] S1: At the initial stage of roadway drivage, install a main junction box (such as J1, J2...) every 200 meters advanced, and connect the sensor group through the A interface.

[0058] S2: The main junction boxes are connected in series through pre-installed 200-meter standard cables to form a sectional monitoring network.

[0059] Cable extension operation (taking the J2→J3 section as an example)

[0060] S1: When the working face advances to the J3 section, continue to connect a new cable between J2 and J3: Connect the B interface of the new cable (including the J3 junction box) to the B interface of J2 (the wiring sequence is the same as in Embodiment 1), connect the J2 end first, and then the J3 end to ensure signal penetration.

[0061] S2: After the B interface line test is normal, disconnect the original A interface line between J2 and J3 (disconnection sequence: red → white → blue → green).

[0062] S3: Switch the sensor group of J3 to its A interface to complete the extension of this section.

[0063] Cable Recycling Operation (Taking the Section from J1 to J2 as an Example)

[0064] S1: When mining back to the section from J1 to J2, pre-connect a 10-meter transition cable between J1 and J2 to the B interface.

[0065] S2: After confirming that the B interface is working properly, remove the original line of the A interface between J1 and J2 (the disconnection sequence is the same as above).

[0066] S3: Gradually recycle the redundant cable in the section from J1 to J2 to keep the sensors in J2 and subsequent sections operating normally.

[0067] Anti-signal Attenuation Design

[0068] The main junction box is built-in with a signal amplifier module to compensate for the signal strength every 200 meters.

[0069] Use twisted pair shielded cable to reduce electromagnetic interference.

[0070] Fast Switching Mechanism

[0071] The main junction box is equipped with a dual-power redundant interface, which automatically provides seamless power supply during switching.

[0072] Use quick-connect terminal blocks to shorten the disconnection and connection time (≤5 minutes per time).

[0073] Intelligent Monitoring Function

[0074] The main junction box integrates a self-diagnosis module to monitor the continuity and impedance of the line in real time and automatically alarm in case of abnormalities.

[0075] Upload data to the ground monitoring center to achieve remote operation and maintenance.

[0076] Effectively Solve the Voltage Drop Problem

[0077] Through the operation process of first connecting a new cable between junction boxes and connecting it to the spare interface and then removing the old cable, continuous power supply and signal transmission of the sensors during the cable recycling process are realized, avoiding the problem of sensor power failure caused by directly removing the old line in traditional operations, thus preventing unplanned power outages caused by system fault locking and ensuring the continuity and safety of underground coal mining work. At the same time, strictly following the sequence of connecting first and then disconnecting, and first power supply and then signal, effectively solves the voltage drop problem in long-distance power supply, ensures the stability of the power supply voltage by optimizing the line connection method, and significantly reduces the risk of electrical short circuit caused by improper operation, providing higher safety protection for underground operations.

[0078] In the cable connection operation, through the pre-installation of segmented lines and the design of a dual-interface junction box, seamless extension of the monitoring cable is achieved when the working face advances, eliminating the inevitable sensor disconnection phenomenon in traditional connection methods, ensuring the real-time and integrity of the data of the safety monitoring system. This standardized connection process not only solves the technical problem of monitoring signal interruption, but also effectively alleviates the voltage drop problem of long-distance lines through segmented power supply, greatly improving the power supply stability and reducing equipment damage and maintenance time caused by improper operation.

[0079] Test data of a 3000-meter ultra-long roadway in a coal mine:

[0080] Indicator Traditional method The segmented method of this application Number of disconnections per month ≥8 times 0 times Average maintenance time 30 minutes per time 10 minutes per time Signal stability Attenuation is about 15% Attenuation ≤5%

[0081] Through the layout of segmented junction boxes and dual-channel hot-switching technology, problems such as sensor cable disconnection and signal attenuation in ultra-long roadways are solved, which is especially suitable for the long-distance safety monitoring needs of intelligent mines.

[0082] The standard parts used in the present invention can all be purchased from the market. The special-shaped parts can be customized according to the description of the specification and the drawings. The specific connection methods of each part all adopt conventional means such as bolts, rivets, and welding that are mature in the prior art. The machinery, parts, and equipment all adopt conventional models in the prior art. In addition, the circuit connection adopts the conventional connection method in the prior art, which will not be elaborated here. The content not described in detail in this specification belongs to the prior art well-known to those skilled in the art.

[0083] In the description of the present invention, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features. The meaning of "a plurality" is two or more, unless otherwise specifically defined.

[0084] In the present invention, unless otherwise clearly specified and limited, the terms "installation", "connection", "connection", "fixation", etc. should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the internal communication of two components or the interaction relationship between two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0085] In the present invention, unless otherwise clearly specified or limited, a first feature being "on" or "under" a second feature may mean that the first and second features are in direct contact, or the first and second features are indirectly in contact via an intermediate medium. Moreover, a first feature being "above", "over" and "on top of" a second feature may mean that the first feature is directly above or obliquely above the second feature, or merely indicates that the horizontal height of the first feature is higher than that of the second feature. A first feature being "under", "below" and "beneath" a second feature may mean that the first feature is directly below or obliquely below the second feature, or merely indicates that the horizontal height of the first feature is less than that of the second feature.

[0086] In the description of this specification, the description with reference to terms such as "an embodiment", "some embodiments", "examples", "specific examples" or "some examples" etc. means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not have to be directed to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in a suitable manner in any one or more embodiments or examples. In addition, without contradiction, those skilled in the art can combine and combine the different embodiments or examples described in this specification and the features of different embodiments or examples.

[0087] In the attached drawings of the disclosed embodiments of the present invention, only the structures related to the disclosed embodiments are involved, and other structures can refer to the general design. Without conflict, the same embodiment and different embodiments of the present invention can be combined with each other.

[0088] Although the present invention has been described in detail with reference to the foregoing embodiments, for those skilled in the art, they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements for some of the technical features. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A method for operating a sensor-based working surface in a coal mine without interrupting the line, characterized in that: The following steps are involved: Cable recovery operation process: S1. When the coal mining face is mined to a predetermined distance, a monitoring cable is connected between the No. 2 junction box and the No. 3 junction box; S2. Use the two ends of the extension cable to connect the B interface of the No. 2 junction box and the No. 3 junction box respectively. First connect the B interface of the No. 2 junction box, and then connect the B interface of the No. 3 junction box. S3, the wiring sequence is: green wire (signal negative) connected to B1 terminal, blue wire (signal positive) connected to B2 terminal, white wire (power negative) connected to B3 terminal, red wire (power positive) connected to B4 terminal; S4. After the cables to be connected are securely fastened, remove the original connecting wire No. ③ between the No. 2 junction box and the No. 3 junction box; S5, the order of removing wires is: red wire (power positive), white wire (power negative), blue wire (signal positive), green wire (signal negative); Cable connection operation process: S1. When the working face needs to extend the monitoring cable forward, connect the line consisting of line ④, line 4 and line ⑤ between the No. 2 junction box and the No. 3 junction box; S2. Connect the two ends of the extended line to the B interface of the No. 2 junction box and the No. 3 junction box respectively, first connect the B interface of the No. 2 junction box, and then connect the B interface of the No. 3 junction box; S3, the wiring sequence is: green wire (signal negative) connected to B1 terminal, blue wire (signal positive) connected to B2 terminal, white wire (power negative) connected to B3 terminal, red wire (power positive) connected to B4 terminal; S4. After the cables to be connected are securely fastened, remove the original connecting wire No. ③ between the No. 2 junction box and the No. 3 junction box; S5. The order of removing wires is: red wire (positive power), white wire (negative power), blue wire (positive signal), green wire (negative signal).

2. The method of claim 1, wherein the method is based on the continuous line of the sensor on the working face of a coal mine, characterized in that: When the cable is connected, the outer sheath and shielding layer of the monitoring cable are removed according to the length of use, and the cable is passed through the bell mouth, retaining ring, and sealing ring in sequence. After tightening the bell mouth, the insulation layer is stripped off in sequence and connected to the corresponding terminal.

3. The method of claim 1, wherein the method is based on the continuous line of the sensor on the working face of a coal mine, and the method is characterized in that: When removing the cable, you must first ensure that the continued cable is firmly connected, then remove the original connecting wires in order, and use wire cutters to cut off the exposed wire core, and finally loosen the bell mouth to take out the monitoring cable and restore the sealing structure.

4. The method of claim 1, wherein the method is based on the continuous line of the sensor on the working face of a coal mine, and the method is characterized in that: The method also includes reserving a junction box in advance at the sensor end to avoid line breakage caused by line extension and line retraction.

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