Opto-electric composite cable and mine monitoring system having the same

Abstract

The utility model discloses a kind of photoelectric composite cable and the monitoring system of mining with it, photoelectric composite cable includes: cable body (71), it includes: at least one main line body (711), at least one control line core (712) and protection layer group (713), wherein, at least one main line body (711) is configured to be used for transmission to the electric signal of power supply of coal winning machine (80) power system;At least one control line core (712) is configured to be used for transmission the control signal of coal winning machine (80);Protection layer group (713) is located at the outside of at least one main line body (711) and at least one control line core (712), it is configured to be used for protecting at least one main line body (711) and at least one control line core (712);Still include: multimode temperature sensing fiber (72), close to at least one main line body (711) setting, it is configured to be used for sensing the temperature information of at least one main line body (711).

Description

Technical Field

[0001] This utility model relates to the field of fiber optic monitoring technology, and in particular to a photoelectric composite cable and a mining monitoring system having the same. Background Technology

[0002] Underground power cables in coal mines are fundamental infrastructure ensuring the continuous and safe operation of critical equipment such as mining, belt conveyors, ventilation, and hoisting. The mine environment is enclosed, humid, dusty, confined, and subject to electromagnetic interference. Cables operate under high loads, high temperatures, moisture, and mechanical stress for extended periods, making them prone to insulation aging, sheath damage, localized overheating, and mechanical compression. If these problems are not detected and addressed promptly, they can not only damage the cables themselves but also potentially cause electrical short circuits, sparks, or even combustion and explosion accidents, leading to equipment damage, underground production shutdowns, personnel casualties, and significant economic losses. Currently, temperature monitoring methods for mining cables include: 1. Manual inspection; 2. Temperature measurement methods using sensors or detection probes.

[0003] The first method relies on manual, periodic monitoring of the cable surface temperature. While simple and low-cost, this method suffers from long inspection cycles and is affected by manpower, environment, and inspection quality. It is not only labor-intensive and inefficient, but also struggles to cover all locations and detect short-term, sudden hotspots, and cannot achieve continuous online monitoring.

[0004] The second method involves pressing the probe or temperature sensor firmly against the cable surface for temperature measurement. This method can achieve stable contact temperature measurement at the installation point and reduce the probability of occasional poor contact. However, this method has problems such as complex size and structure, many moving parts, susceptibility to wear or jamming in the humid, dusty, and vibrating environment of mines, and frequent maintenance. In addition, contact temperature measurement itself may lead to measurement errors or damage to the cable sheath due to contact thermal resistance, cable surface contamination, or long-term pressure.

[0005] In summary, existing technologies cannot achieve real-time, continuous temperature monitoring and early warning of mining cables while ensuring inherent safety. Therefore, a new technical solution is needed that can provide full-length, blind-spot-free temperature distribution monitoring, quickly locate anomalies, and trigger reliable early warnings in harsh underground working conditions. This would provide a basis for timely maintenance and risk control, and reduce operation and maintenance costs and accident rates. Utility Model Content

[0006] This solution addresses the problems and needs raised above by proposing a photoelectric composite cable and a mining monitoring system incorporating it. Due to the adoption of the following technical features, it is able to achieve the aforementioned technical objectives and bring about several other technical benefits.

[0007] One objective of this utility model is to provide a photoelectric composite cable, comprising: The cable body includes: at least one main body, at least one control core, and a protective layer assembly, wherein the at least one main body is configured to transmit electrical signals for supplying power to the power system of the coal mining machine; the at least one control core is configured to transmit control signals for the coal mining machine; and the protective layer assembly is disposed outside the at least one main body and the at least one control core, and is configured to protect the at least one main body and the at least one control core. Also includes: A multimode temperature-sensing optical fiber is positioned close to at least one mainline body and configured to sense temperature information of at least one mainline body.

[0008] In addition, the photoelectric composite cable and the mining monitoring system incorporating the present invention may also have the following technical features: In one example of this invention, the multimode temperature-sensing optical fiber is disposed inside the protective layer group and arranged along the extension direction of at least one main body.

[0009] In one example of this utility model, the main body includes multiple main bodies, which are spaced apart along the circumferential direction of the multimode temperature-sensing optical fiber; wherein the outer contour wall of each main body is in contact with the outer contour wall of the multimode temperature-sensing optical fiber.

[0010] In one example of this utility model, the main body comprises three, and they are equally spaced along the circumferential direction of the multimode temperature-sensing optical fiber disposed on the central axis of the optoelectronic composite cable.

[0011] In one example of this utility model, the multimode temperature-sensing fiber is disposed outside the protective layer group and is wound around the protective layer group along the circumferential direction of the protective layer group, and the multimode temperature-sensing fiber is arranged along the outer contour extension direction of the protective layer group.

[0012] In one example of this invention, the multimode temperature-sensing optical fiber is wound with equal pitch.

[0013] In one example of this utility model, the main body includes: a main conductor, an insulation layer, and an insulation shielding layer, which are sequentially wrapped from the inside out.

[0014] In one example of this utility model, the protective layer group includes: an inner protective layer, a Kevlar braided reinforcement layer, and a protective sleeve, which are sequentially arranged from the inside to the outside.

[0015] In one example of this invention, the multimode temperature-sensing optical fiber is a quartz glass component.

[0016] Another object of the present invention is to provide a mining monitoring system for use on a coal mining machine, comprising: The aforementioned optoelectronic composite cable is configured for real-time monitoring of the temperature signal of the cable body. A temperature monitoring host, which is coupled to an optoelectronic composite cable, is configured to collect temperature distribution information of the cable body; A signal converter, coupled to the temperature monitoring host, is configured to convert an optical signal of temperature into an electrical signal; A data server, coupled to the signal converter, is configured to store, parse, and alarm the temperature signal of the cable body. The host, which is coupled to the data server, is configured to display and manage the processing results of the data server.

[0017] Compared with the prior art, the present invention has the following beneficial effects: This optoelectronic composite cable enables continuous, blind-spot-free temperature monitoring of mining cables throughout their entire lifespan. It can detect abnormal temperature rises at any location in real time and achieve meter-level precision, quickly pinpointing potential hazards and effectively shortening maintenance response time. Technically, the system employs passive quartz fiber optic sensing technology, possessing inherent safety and excellent electromagnetic interference resistance. It adapts to the complex underground environment, effectively reducing safety risks caused by sensor electrification or electromagnetic interference. The monitoring system supports all-weather real-time monitoring and temperature trend prediction, issuing timely warnings before temperatures approach dangerous thresholds, shifting from reactive response to proactive prevention, significantly improving safety assurance and operational efficiency. Regarding maintenance costs, the fiber optic sensors have a lifespan similar to that of the cables, exhibiting excellent corrosion and aging resistance, requiring virtually no maintenance, significantly reducing long-term maintenance costs. In terms of system integration, this system easily integrates with existing mine monitoring, gas detection, video, and dispatching systems, supporting multi-sensor data fusion and functional expansion, providing strong support for intelligent centralized operation and maintenance management in mines.

[0018] The preferred embodiments of the present invention will be described in more detail below with reference to the accompanying drawings, so as to facilitate an understanding of the features and advantages of the present invention. Attached Figure Description

[0019] To more clearly illustrate the technical solutions of the embodiments of this utility model, the accompanying drawings of the embodiments of this utility model will be briefly described below. The drawings are merely illustrative of some embodiments of this utility model and are not intended to limit the scope of all embodiments of this utility model.

[0020] Figure 1 This is a schematic diagram of the structure of one of the optoelectronic composite cables according to an embodiment of the present utility model; Figure 2 This is a schematic diagram of the structure of another optoelectronic composite cable according to an embodiment of the present utility model; Figure 3 This is a schematic diagram of the monitoring system according to a specific implementation of the present utility model. Figure 4 This is a schematic diagram of the system functional structure according to an embodiment of the present utility model.

[0021] List of reference numerals in the attached diagram: Monitoring system 100; Host 10; Data server 20; Network cable 30; Signal converter 40; Fiber optic cable 50; Temperature monitoring host 60; 70mm optical fiber composite cable; Cable body 71; Main storyline 711; Main conductor 7111; Insulation layer 7112; Insulating shielding layer 7113; Control wire core 712; Protective layer group 713; Inner protective layer 7131; Kevlar braided reinforcement layer 7132; Protective case 7133; Multimode temperature-sensing fiber optic cable 72; Coal mining machine 80; Pitch P. Detailed Implementation

[0022] To make the objectives, technical solutions, and advantages of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. The same reference numerals in the drawings represent the same components. It should be noted that the described embodiments are only some, not all, of the embodiments of this utility model. All other embodiments obtained by those skilled in the art based on the described embodiments of this utility model without creative effort are within the scope of protection of this utility model.

[0023] Unless otherwise defined, the technical or scientific terms used herein shall have the ordinary meaning understood by one of ordinary skill in the art to which this invention pertains. The terms “first,” “second,” and similar terms used in this patent application specification and claims do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Similarly, “an” or “a” and similar terms do not necessarily indicate a quantity limitation. Terms such as “comprising” or “including” mean that the element or object preceding the word encompasses the element or object listed following the word and its equivalents, without excluding other elements or objects. Terms such as “connected” or “linked” are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. Terms such as “upper,” “lower,” “left,” and “right” are used only to indicate relative positional relationships; these relative positional relationships may change accordingly when the absolute position of the described object changes.

[0024] According to the first aspect of this utility model, a photoelectric composite cable 70 is provided, such as... Figure 1 and Figure 2 As shown, it includes: The cable body 71 includes: at least one main body 711, at least one control core 712, and a protective layer group 713, wherein the at least one main body 711 is configured to transmit electrical signals for supplying power to the power system of the coal mining machine 80; the at least one control core 712 is configured to transmit control signals of the coal mining machine 80; and the protective layer group 713 is disposed outside the at least one main body 711 and the at least one control core 712, and is configured to protect the at least one main body 711 and the at least one control core 712. Also includes: A multimode temperature-sensing optical fiber 72 is positioned close to at least one main line body 711 and configured to sense the temperature information of at least one main line body 711. Specifically, the principle is that when a laser propagates inside the optical fiber, it will generate various backscatterings, and the temperature change will affect the properties of the backscattered light. By demodulating and analyzing the backscattered light signal, real-time monitoring of the entire line can be achieved.

[0025] In other words, during the operation of the optoelectronic composite cable 70, the multimode temperature-sensing optical fiber 72 senses the temperature information of at least one main cable body 711, enabling the temperature of the optoelectronic composite cable 70 to be monitored in real time, greatly reducing monitoring costs and improving monitoring efficiency. Moreover, it can cover all points and provide more comprehensive monitoring. Furthermore, it is small in size, simple in structure, and not easily worn or jammed in the humid, dusty, and vibrating environment of mines, making maintenance convenient. In addition, the measurement error is small and will not affect the operation of the cable body 71.

[0026] This photoelectric composite cable 70 enables continuous, blind-spot-free temperature monitoring of mining cables throughout their entire length. It can detect abnormal temperature rises at any location in real time and achieve meter-level precision, thereby quickly pinpointing potential hazards and effectively shortening maintenance response time. Technically, the system employs passive quartz fiber optic sensing technology, possessing inherent safety and excellent anti-electromagnetic interference capabilities. It can adapt to complex underground environments, effectively reducing safety risks caused by sensor electrification or electromagnetic interference. Regarding maintenance costs, the fiber optic sensor has a lifespan similar to that of the cable, exhibiting excellent corrosion and aging resistance, requiring virtually no maintenance, significantly reducing long-term system maintenance costs.

[0027] In one example of this utility model, such as Figure 1 As shown, the multimode temperature-sensing optical fiber 72 is disposed inside the protective layer group 713, arranged along the extension direction of at least one main body 711, and disposed close to the at least one main body 711. In short, the multimode temperature-sensing fiber 72, together with the main line body 711 and the control wire core 712, is wrapped inside the protective layer group 713. This makes the multimode temperature-sensing fiber 72, the main line body 711 and the control wire core 712 form a whole, which greatly reduces the size of the optoelectronic composite cable 70, simplifies the structure, makes it less prone to wear or jamming in the humid, dusty and vibrating environment of the mine, and facilitates maintenance. Moreover, this way of arranging the multimode temperature-sensing fiber 72 can cover all points, making the monitoring more comprehensive.

[0028] In one example of this utility model, the main body 711 includes a plurality of main bodies, which are spaced apart along the circumferential direction of the multimode temperature sensing fiber 72; wherein, the outer contour wall of the main body 711 is in contact with the outer contour wall of the multimode temperature sensing fiber 72. Setting up multiple main line bodies 711 can improve heat dissipation efficiency and provide mechanical structural strength, while contacting the multimode temperature sensing fiber 72 with the main line body 711 can improve the monitoring accuracy of the multimode temperature sensing fiber 72.

[0029] In one example of this utility model, the main body 711 includes three, and they are equally spaced along the circumferential direction of the multimode temperature-sensing optical fiber 72 disposed on the central axis of the optoelectronic composite cable 70.

[0030] In one example of this utility model, such as Figure 2 As shown, the multimode temperature-sensing fiber 72 is disposed outside the protective layer group 713 and is wound around the protective layer group 713 along the circumferential direction of the protective layer group 713. The multimode temperature-sensing fiber 72 is arranged along the outer contour extension direction of the protective layer group 713.

[0031] The multimode temperature-sensing optical fiber 72 is disposed outside the protective layer group 713, extending along the outer contour of the protective layer group 713 and wrapped around the protective layer group 713; by wrapping it around the outer contour of the protective layer group 713, the temperature information of the cable body 71 can be monitored more comprehensively, and this wrapping method makes the connection between the multimode temperature-sensing optical fiber 72 and the protective layer group 713 more reliable and stable.

[0032] In one example of this invention, the multimode temperature-sensing optical fiber 72 is wound with a constant pitch P, which can greatly improve the accuracy of temperature monitoring by the multimode temperature-sensing optical fiber 72. It should be noted that the constant pitch P is the distance between two adjacent spiral lines measured along the helix direction of the protective layer group 713.

[0033] In one example of this utility model, such as Figure 1 As shown, the main line body 711 includes: a main line conductor 7111, an insulation layer 7112, and an insulation shielding layer 7113 arranged sequentially from the inside to the outside; by sequentially arranging the insulation layer 7112 and the insulation shielding layer 7113, the main line conductor 7111 inside can be better protected, thereby improving safety.

[0034] In one example of this utility model, such as Figure 1 As shown, the protective layer group 713 includes: an inner sheath 7131, a Kevlar braided reinforcement layer 7132, and a protective sleeve 7133 arranged sequentially from the inside to the outside; by sequentially arranging the inner sheath 7131, the Kevlar braided reinforcement layer 7132, and the protective sleeve 7133, at least one main wire body 711 and at least one control wire core 712 inside can be protected, thereby improving the safety and reliability of the optoelectronic composite cable.

[0035] In one example of this invention, the multimode temperature-sensing optical fiber 72 is made of quartz glass. That is, the multimode temperature-sensing optical fiber 72 is made of quartz glass, is non-conductive, does not generate heat, and does not produce electrical sparks; it is a purely passive device, meeting the inherent safety requirements of underground coal mines. Simultaneously, the use of optical fiber sensing completely eliminates the strong electromagnetic interference generated by large underground electromechanical equipment, ensuring stable and reliable measurement results.

[0036] According to a second aspect of the present invention, a mining monitoring system 100, such as Figure 3 As shown, it is applied to the coal mining machine 80 and includes: The optoelectronic composite cable 70 described above is configured to monitor the temperature signal of the cable body 71 in real time. Temperature monitoring host 60 is coupled to photoelectric composite cable 70 and configured to collect temperature distribution information of cable body 71; A signal converter 40, which is coupled to the temperature monitoring host 60, is configured to convert the optical signal of temperature into an electrical signal; Data server 20, which is coupled to the signal converter 40, is configured to store, parse and alarm the temperature signal of the cable body 71; Host 10, which is coupled to the data server 20, is configured to display and manage the processing results of the data server 20.

[0037] In other words, the mining monitoring system includes: a host 10; a data server 20, coupled to the host 10, configured to store, parse, and alarm the temperature signal of the cable body 71; a signal converter 40, coupled to the data server 20, configured to convert the optical temperature signal into an electrical signal; for example, the data server 20 and the signal converter 40 are connected via a network cable 30. For example, the signal converter 40 is a mining explosion-proof signal converter. A temperature monitoring host 60, coupled to the signal converter 40, is configured to collect the temperature information distribution of the cable body 71; for example, the temperature monitoring host 60 is a mining explosion-proof and intrinsically safe coal mine high-voltage cable temperature online monitoring device host. For another example, the temperature monitoring host 60 and the signal converter 40 are connected via an optical fiber 50. The aforementioned photoelectric composite cable 70 is coupled between the temperature monitoring host 60 and the coal mining machine 80, configured to monitor the temperature signal of the cable body 71 in real time.

[0038] In short, mining monitoring systems include both surface and underground deployments.

[0039] The ground deployment includes a host 10, a data server 20, and a signal converter 40. The host 10 is connected to the data server 20 and the signal converter 40 via a network cable 30, which transmits the cable temperature status to the host 10.

[0040] The underground deployment includes a temperature monitoring host 60 for explosion-proof and intrinsically safe coal mine high-voltage cables, a photoelectric composite cable 70, and a coal mining machine 80. At the power supply box end of the coal mining machine 80 and the roadway power distribution point end, the multimode temperature-sensing optical fiber 72 in the photoelectric composite cable 70 is led out through the optical fiber terminal box, and the temperature signal is collected by the temperature monitoring host 60.

[0041] The working process of the monitoring system 100 is as follows: First, during normal operation, the photoelectric composite cable 70 transmits electrical signals to the power system of the coal mining machine 80 via at least one main cable body 711; at least one control core 712 transmits control signals to the coal mining machine 80; and the temperature information of the cable body 71 is sensed by the multimode temperature-sensing optical fiber 72. Next, the temperature monitoring host 60 collects the temperature information distribution of the cable body 71. Then, the mine explosion-proof signal converter 40 converts the optical fiber signal into an electrical signal and transmits it to the data server 20. The data server 20 stores, parses, and alarms the temperature data, and sends the processing results to the host 10 via the network for display and operation and maintenance management.

[0042] This photoelectric composite cable 70 enables continuous, blind-spot-free temperature monitoring of mining cables throughout their entire lifespan. It can detect abnormal temperature rises at any location in real time and achieve meter-level precision, quickly pinpointing potential hazards and effectively shortening maintenance response time. Technically, the system employs passive quartz fiber optic sensing technology, possessing inherent safety and excellent electromagnetic interference resistance. It adapts to the complex underground environment, effectively reducing safety risks caused by sensor electrification or electromagnetic interference. The monitoring system 100 supports all-weather real-time monitoring and temperature trend prediction, issuing timely warnings before temperatures approach dangerous thresholds, shifting from reactive response to proactive prevention, significantly improving safety assurance and operational efficiency. Regarding maintenance costs, the fiber optic sensors have a lifespan similar to that of the cables, exhibiting excellent corrosion and aging resistance, requiring almost no maintenance, significantly reducing long-term maintenance costs. In terms of system integration, this system easily integrates with existing mine monitoring, gas detection, video, and dispatching systems, supporting multi-sensor data fusion and functional expansion, providing strong support for intelligent centralized operation and maintenance management in mines.

[0043] Preferably, the monitoring system 100 can be connected to the mine's existing integrated automation platform or cloud platform to achieve unified data management, remote web access, and historical data query and analysis. Using the system software functions, temperature distribution curves can be plotted, and the temperature field changes along the entire cable can be observed in real time. By analyzing historical trends, the aging condition and load capacity of the cable can be assessed.

[0044] Specifically, such as Figure 4 As shown, the system software includes a data acquisition module, a data storage and query module, a data display module, an information export module, and a self-diagnosis module. The data storage and query module provides historical data, curve queries, and daily monitoring reports. The data display module displays information including location, name, monitoring value, alarm threshold, maximum value, minimum value, alarm status, and clearance time; real-time and historical analog curves are displayed, showing maximum, minimum, and average values ​​on the same coordinate system; and an equipment layout diagram display function shows the names, locations, and status information of the equipment and sensors.

[0045] The system software enables functions such as global temperature distribution display, automatic refresh at fixed time intervals, continuous single-point monitoring, and temperature data storage. When an abnormal temperature is detected, the system records the alarm time, the temperature value at the time of the alarm, and the alarm location, and displays this information in the alarm history table. The alarm data is then stored in a database for easy historical retrieval and data analysis.

[0046] The foregoing description, with reference to preferred embodiments, details exemplary implementations of the optoelectronic composite cable 70 and the mining monitoring system 100 having therein proposed by this utility model. However, those skilled in the art will understand that various modifications and alterations can be made to the above specific embodiments without departing from the concept of this utility model, and various combinations can be made to the various technical features and structures proposed by this utility model without exceeding the protection scope of this utility model, which is determined by the appended claims.

Claims

1. A photoelectric composite cable, comprising: The cable body (71) includes: at least one main body (711), at least one control core (712), and a protective layer group (713), wherein the at least one main body (711) is configured to transmit electrical signals for supplying power to the power system of the coal mining machine (80); the at least one control core (712) is configured to transmit control signals of the coal mining machine (80); and the protective layer group (713) is disposed outside the at least one main body (711) and the at least one control core (712), and is configured to protect the at least one main body (711) and the at least one control core (712). Its characteristic is that it further includes: A multimode temperature-sensing fiber (72) is positioned close to at least one main body (711) and configured to sense temperature information of at least one main body (711).

2. The optoelectronic composite cable according to claim 1, characterized in that, The multimode temperature-sensing optical fiber (72) is disposed inside the protective layer group (713) and arranged along the extension direction of at least one main body (711).

3. The optoelectronic composite cable according to claim 2, characterized in that, The main body (711) includes multiple components, which are spaced apart along the circumferential direction of the multimode temperature-sensing optical fiber (72); wherein the outer contour wall of the main body (711) is in contact with the outer contour wall of the multimode temperature-sensing optical fiber (72).

4. The optoelectronic composite cable according to claim 3, characterized in that, The main body (711) includes three components, which are equally spaced along the circumferential direction of the multimode temperature-sensing optical fiber (72) located on the central axis of the optoelectronic composite cable (70).

5. The optoelectronic composite cable according to claim 1, characterized in that, The multimode temperature-sensing fiber (72) is disposed outside the protective layer group (713) and is wound around the protective layer group (713) along the circumferential direction of the protective layer group (713). The multimode temperature-sensing fiber (72) is arranged along the outer contour extension direction of the protective layer group (713).

6. The optoelectronic composite cable according to claim 5, characterized in that, The multimode temperature-sensing optical fiber (72) is wound in a constant pitch (P) winding manner.

7. The optoelectronic composite cable according to claim 1, characterized in that, The main body (711) includes: a main conductor (7111), an insulation layer (7112), and an insulation shielding layer (7113) arranged sequentially from the inside to the outside.

8. The optoelectronic composite cable according to claim 1, characterized in that, The protective layer group (713) includes: an inner protective layer (7131), a Kevlar braided reinforcement layer (7132), and a protective sleeve (7133) arranged sequentially from the inside to the outside.

9. The optoelectronic composite cable according to claim 1, characterized in that, The multimode temperature-sensing optical fiber (72) is a quartz glass component.

10. A mining monitoring system, characterized in that, Applied to coal mining machines (80), including: The optoelectronic composite cable (70) as described in any one of claims 1 to 9 is configured for real-time monitoring of the temperature signal of the cable body (71); Temperature monitoring host (60), which is coupled to photoelectric composite cable (70) and configured to collect temperature distribution information of cable body (71); A signal converter (40), which is coupled to the temperature monitoring host (60), is configured to convert an optical signal of temperature into an electrical signal; A data server (20), coupled to the signal converter (40), is configured to store, parse and alarm the temperature signal of the cable body (71); The host (10), which is coupled to the data server (20), is configured to display and manage the processing results of the data server (20).

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