A branch communication cable assembly for microseismic and electrical method monitoring in a coal mine underground

Abstract

The utility model discloses a kind of branch communication cable assemblies for underground coal mine microseism and electric method monitoring, belong to mine monitoring technical field.A kind of branch communication cable assemblies for underground coal mine microseism and electric method monitoring, including main cable, quick interface is fixedly connected on main cable, shielding structure is arranged in main cable, and main cable is fixedly provided with multiple branch cables by injection molding part;The utility model can inhibit high-frequency interference by setting aluminium foil in cable, setting the braided mesh of tinned copper wire weaving on the outside of aluminium foil, lead away low-frequency noise, improve anti-interference ability, adopt injection molding part connection in the branch cable and main cable combination place, with waterproof, anti-oxidation effect, underground humid, corrosive environment can also reduce the influence of interface, improve the reliability of connection.

Description

Technical Field

[0001] This utility model relates to the field of mine monitoring technology, and in particular to a branch communication cable assembly for microseismic and electrical monitoring in coal mines. Background Technology

[0002] Microseismic monitoring and electrical resistivity tomography (EDT) are two important geophysical methods used in coal mines to monitor coal seam stress changes, fracture development, and the risk of water inrush / gas outbursts in real time, ensuring safe mine production. Microseismic monitoring involves deploying sensor arrays to capture elastic waves (frequency 1Hz~1kHz) released from coal and rock fractures, and then retrieving the fracture location, energy, and mechanism. EDT involves injecting current and measuring the potential difference to retrieve the resistivity distribution of the coal seam / surrounding rock, identifying anomalies such as water-bearing fractures and goafs. Microseismic and EDT technologies are highly complementary, and their combined application can significantly improve the early warning effectiveness of dynamic disasters in coal mines.

[0003] In the underground environment of coal mines, a specially designed branch communication cable assembly is typically required for the effective deployment and operation of microseismic and electrical resistivity monitoring systems. This cable assembly must not only possess excellent electrical performance but also meet the special environmental requirements of mines, such as pressure resistance, waterproofing, and explosion-proof properties.

[0004] Existing branch communication cable assemblies not only have insufficient anti-interference capabilities during use, but also suffer from poor connection reliability. The single-layer shielding is insufficient to effectively suppress high-frequency noise and ground coupling interference, leading to signal distortion. Furthermore, the joints between the cable and the branch electrode are mostly hand-welded or wrapped, making them susceptible to the effects of the damp and corrosive environment underground, resulting in increased contact resistance. Utility Model Content

[0005] The purpose of this invention is to solve the problems of insufficient anti-interference capability and poor reliability of the connection between branch cables and the main line in the existing technology, and to propose a branch communication cable assembly for micro-vibration and electrical method monitoring in coal mines.

[0006] To achieve the above objectives, the present invention adopts the following technical solution:

[0007] A branch communication cable assembly for microseismic and electrical monitoring in coal mines includes a main cable with a quick-connect interface fixedly connected to it. The main cable has a shielding structure inside and multiple branch cables are fixedly installed on it via injection molding.

[0008] To enhance the shielding effect, preferably, the main cable includes multiple sets of twisted pairs, which are located within the shielding structure.

[0009] To improve the anti-interference capability of the cable, the shielding structure further includes aluminum foil and braided mesh. The aluminum foil is fixedly disposed on the outside of the twisted pair through a first filling layer, and multiple sets of aluminum foil are located inside the braided mesh. A second filling layer is fixedly disposed between the braided mesh and the aluminum foil.

[0010] Furthermore, the woven mesh is made of tin-plated copper wire.

[0011] To ensure the connection between the branch cable and the main cable, the injection molded part is preferably a T-shaped structure.

[0012] Preferably, the injection molded part is made of polyurethane.

[0013] Compared with the prior art, this utility model provides a branch communication cable assembly for microseismic and electrical monitoring in coal mines, which has the following advantages:

[0014] 1. This branch communication cable assembly for micro-vibration and electrical method monitoring in coal mines can suppress high-frequency interference by setting aluminum foil inside the cable, and conduct low-frequency noise by setting a braided mesh of tinned copper wire on the outside of the aluminum foil. In addition, the twisted structure of the twisted pair reduces the electromagnetic coupling effect and improves the anti-interference ability.

[0015] 2. This branch communication cable assembly for microseismic and electrical monitoring in coal mines connects the branch cables to the main cables using injection-molded parts. The injection-molded parts are sealed using a potting injection molding process, which provides waterproof and anti-oxidation effects. This increases the connection strength between the branch cables and the main cables and reduces the impact of the humid and corrosive underground environment on the interface.

[0016] The parts of this device not described herein are the same as or can be implemented using existing technologies. This utility model can suppress high-frequency interference by setting aluminum foil inside the cable, and to guide low-frequency noise by setting a braided mesh of tin-plated copper wire on the outside of the aluminum foil, thereby improving anti-interference ability. The injection-molded parts are used to connect the branch cable and the main cable, which has waterproof and anti-oxidation effects, and can also reduce the impact of the damp and corrosive environment in the well on the interface, thereby improving the reliability of the connection. Attached Figure Description

[0017] Figure 1 This invention presents a structural schematic diagram of a branch communication cable assembly for microseismic and electrical monitoring in underground coal mines. Figure 1 ;

[0018] Figure 2 This invention presents a structural schematic diagram of a branch communication cable assembly for microseismic and electrical monitoring in underground coal mines. Figure 2 ;

[0019] Figure 3This invention presents a structural schematic diagram of a branch communication cable assembly for microseismic and electrical monitoring in underground coal mines. Figure 3 ;

[0020] Figure 4 This is a cross-sectional view of the main cable of a branch communication cable assembly for microseismic and electrical monitoring in coal mines, as proposed in this utility model.

[0021] In the diagram: 1. Main cable; 101. Twisted pair cable; 102. Aluminum foil; 103. Braided mesh; 2. Branch cable; 3. Injection molded part. Detailed Implementation

[0022] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.

[0023] In the description of this utility model, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0024] Example:

[0025] Reference Figures 1-4A branch communication cable assembly for microseismic and electrical resistivity monitoring in coal mines includes a main cable 1. The main cable 1 includes multiple sets of twisted pairs 101. The twisting method of the twisted pairs 101 can cancel the influence of external electromagnetic fields on the conductors because the induced current will generate magnetic fields in opposite directions in each pair of conductors, thus canceling each other out. The twisted pairs 101 are provided in two to ten sets, preferably four sets. The twisted pairs 101 are preferably enameled wires. At least one end of the main cable 1 is fixedly connected to a quick connector. Preferably, one end of the main cable 1 is fixedly provided with a quick connector, and the quick connector is preferably an aviation plug for quick connection. A shielding structure is provided inside the main cable 1, and the twisted pairs 101 are located within the shielding structure. To improve the anti-interference capability of the main cable 1, multiple sets of branch cables 2 are fixedly installed on the main cable 1 via injection molding parts 3. Electrodes or detectors are fixedly connected to the end of the branch cables 2 away from the injection molding parts 3 for easy detection. The injection molding parts 3 have a three-way structure, similar to a T-shaped structure, and connect the branch cables 2 to the main cable 1 using injection molding parts 3. The injection molding parts 3 are sealed using a potting injection molding process, which has waterproof and anti-oxidation effects. This not only increases the connection strength between the branch cables 2 and the main cable 1, but also reduces the impact of the humid and corrosive environment underground on the interface. A set of branch cables 2 is set on the main cable 1 every 5-20 meters. Here, we prefer 10 meters. There are two to ten sets of branch cables 2, preferably four sets, for ease of use.

[0026] Reference Figure 4 Here, the shielding structure includes aluminum foil 102 and braided mesh 103. The aluminum foil 102 is fixedly disposed on the outside of the twisted pair 101 via a first filling layer. That is, aluminum foil 102 is disposed on the outside of the twisted pair 101. Multiple sets of aluminum foil 102 are located within the braided mesh 103, and a second filling layer is fixedly disposed between the braided mesh 103 and the aluminum foil 102. An outer sheath is fixedly disposed on the outside of the braided mesh 103. The outer sheath includes an insulating layer fixedly disposed on the outside of the braided mesh 103. A waterproof layer and a flame-retardant layer are sequentially fixedly disposed on the outside of the insulating layer to improve the performance. Furthermore, both the first and second filler layers are made of fibrous materials (such as polyester fiber) or other soft materials to keep the cable round, avoid gaps, increase mechanical strength, and facilitate subsequent processing. Here, we prefer to use tin-plated copper wire as the material for the braided mesh 103, that is, a mesh structure woven from tin-plated copper wire. In use, by setting aluminum foil 102 inside the cable, high-frequency interference can be suppressed. The braided mesh 103 woven from tin-plated copper wire is set on the outside of the aluminum foil 102 to guide away low-frequency noise. Moreover, combined with the twisted structure of the twisted pair 101, the electromagnetic coupling effect is reduced and the anti-interference ability is improved.

[0027] Reference Figures 1-3Here, we use polyurethane as the material for injection molded part 3. When in use, after connecting branch cable 2 to main cable 1, a mold with a T-shaped structure is fitted at the joint. Polyurethane glue is filled into the mold. After curing, the mold is removed to form an elastic protective layer. This not only increases the connection strength between branch cable 2 and main cable 1, but also adapts to downhole mechanical stress and improves the performance.

[0028] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.

Claims

1. A branched communication cable assembly for microseismic and electrical monitoring in a coal mine underground, comprising a main cable (1), characterized in that, The main cable (1) is fixedly connected to a quick interface, the main cable (1) is provided with a shielding structure, and the main cable (1) is fixedly provided with multiple sets of branch cables (2) through injection molding parts (3).

2. The branched communication cable assembly for microseismic and electrical monitoring in underground coal mines according to claim 1, characterized in that, The main cable (1) includes multiple sets of twisted pairs (101), which are located within a shielding structure.

3. The branched communication cable assembly for microseismic and electrical monitoring in underground coal mines according to claim 2, characterized in that, The shielding structure includes aluminum foil (102) and braided mesh (103). The aluminum foil (102) is fixedly disposed on the outside of the twisted pair (101) through a first filling layer. Multiple sets of aluminum foil (102) are located inside the braided mesh (103), and a second filling layer is fixedly disposed between the braided mesh (103) and the aluminum foil (102).

4. A branch communication cable assembly for microseismic and electrical resistivity monitoring in underground coal mines according to claim 3, characterized in that, The woven mesh (103) is made of tin-plated copper wire.

5. A branch communication cable assembly for microseismic and electrical resistivity monitoring in underground coal mines according to claim 1, characterized in that, The injection molded part (3) has a three-way structure.

6. A branch communication cable assembly for microseismic and electrical resistivity monitoring in underground coal mines according to claim 1, characterized in that, The injection molded part (3) is made of polyurethane.

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