A goaf bending subsidence zone monitoring mechanism

Abstract

A kind of goaf curved subsidence zone monitoring mechanism, including measuring assembly and vertically arranged pre-buried rod assembly;Pre-buried rod assembly includes several range-extending sleeves, and first pipe fittings arranged between adjacent two range-extending sleeves, range-extending sleeve is arranged to be telescopic;Measuring assembly includes positioner capable of moving inside range-extending sleeve and first pipe fitting;Monitoring mechanism further includes signal receiver in communication connection with positioner, first pipe fitting is fixed with strong magnetic collar inside, positioner includes induction coil, it is set as when passing through strong magnetic collar, it can be sent to signal receiver with the inductive current generated, the installation of pre-buried rod assembly is carried out on the ground above coal mining face, installation is more simple and convenient, through the cooperation of positioner and measuring sleeve, the monitoring of overburden strata subsidence displacement in goaf is realized.

Description

Technical Field

[0001] This utility model relates to the field of mine monitoring technology, specifically a monitoring mechanism for the bending and subsidence zone of a goaf. Background Technology

[0002] Coal mining creates goaf areas. The overlying strata of these goaf areas can be categorized into caving zones, fracture zones, and flexural subsidence zones based on their condition. Currently, methods such as borehole inspection and double-end sealing with water injection for measuring caving and fracture zones are commonly used. Regarding the monitoring of flexural subsidence zones, patent application CN201810357277.8 discloses a monitoring system for the flexural subsidence zone overlying strata in coal mine goaf areas. This system includes a first sleeve, an outer shell, a second sleeve, and bolts. The monitoring system is installed within the goaf area and uses horizontal sensors and laser distance sensors to measure the convergence of the top and bottom plates, thereby enabling real-time monitoring of the subsidence development of each layer below the surface. However, on the one hand, installation within the goaf area is difficult; on the other hand, once the goaf roof collapses and fails, the system can no longer monitor the flexural subsidence zone of the overlying strata, resulting in inaccurate monitoring results. Utility Model Content

[0003] To address the technical problems mentioned above, this utility model provides a monitoring mechanism for the bending and subsidence zone in a goaf.

[0004] The technical solution of this utility model is as follows:

[0005] A goaf bending and subsidence zone monitoring mechanism includes a measuring component and a vertically arranged pre-embedded rod component. The pre-embedded rod component can be vertically arranged in a vertical construction borehole on the ground surface above the coal mining face, and the measuring component and the pre-embedded rod component cooperate to complete the monitoring of the goaf bending and subsidence zone.

[0006] As the core technical concept of this utility model, the pre-embedded rod assembly includes several range extender sleeves, and a measuring sleeve is connected between two adjacent range extender sleeves. The measuring sleeve includes a first pipe fitting that is vertically arranged and whose two ends are respectively connected to two adjacent range extender sleeves. The range extender sleeve is designed to be telescopic. The measuring assembly includes a locator that can move inside the range extender sleeve and the first pipe fitting. The monitoring mechanism also includes a signal receiver that is communicatively connected to the locator. A strong magnetic collar is fixed inside the first pipe fitting. The locator includes an induction coil, which is configured to transmit the induced current generated when passing through the strong magnetic collar to the signal receiver. The pre-embedded rod assembly is installed on the ground surface above the coal mining face, which makes the installation simpler and more convenient. By controlling that each of the different overlying rock strata in the goaf contains at least one set of measuring sleeves, the measuring sleeves can be moved when different rock strata undergo settlement displacement. On this basis, when the locator moves past the measuring sleeve, it can generate an induced current. Based on the time when the locator generates the induced current, the position of the measuring sleeve can be determined, thereby realizing the monitoring of the settlement displacement of different overlying rock strata in the goaf.

[0007] As described above, a goaf bending subsidence zone monitoring mechanism further includes a drive motor connected to a locator. The drive motor is configured to uniformly insert the locator into the pre-embedded rod assembly from the top to the bottom. By calculating the time from when the locator starts moving from the top of the pre-embedded rod assembly to when the signal receiver receives the signal, and combining this with the displacement velocity of the locator, the position (depth) information of the measuring sleeve can be obtained, thereby realizing the monitoring of the subsidence information of the corresponding rock strata.

[0008] As a preferred embodiment, to ensure that the positioner can descend smoothly inside the pre-embedded rod assembly, the lower side of the positioner is tapered or frustoconical.

[0009] Specifically, the positioner includes a vertically arranged measuring tube, and sealing caps and counterweights respectively located at the upper and lower ends of the measuring tube. The induction coil is located inside the measuring tube, which provides protection for the induction coil. The lower side of the counterweight has an inverted conical structure with the tip pointing downwards. To facilitate the replacement and connection of the induction coil, both the sealing cap and the counterweight are threaded to the measuring tube.

[0010] As described above, the goaf bending and subsidence monitoring mechanism, specifically the structure of the extended casing, includes a second pipe fitting and a third pipe fitting telescopically disposed inside one end of the third pipe fitting, and a limiting member is provided between the two pipe fittings to prevent the two pipe fittings from disengaging.

[0011] In a preferred embodiment, to facilitate the anchoring of the pre-embedded rod assembly to the drilled hole, the outer diameters of the first and second pipe fittings are the same.

[0012] As a further preferred embodiment, in order to further ensure the anchoring effect of the first and second pipe fittings in the borehole, and thus ensure that the first pipe fitting can produce corresponding actions when the corresponding rock stratum settles and shifts, the outer surfaces of both the first and second pipe fittings are rough.

[0013] In the goaf bending and subsidence monitoring mechanism described above, to ensure the cooperation effect between the locator and the measuring sleeve, that is, to ensure the accuracy of the locator's position judgment, multiple strong magnetic collars are evenly distributed along the axial direction of the first pipe.

[0014] The beneficial effects of this utility model are as follows: This utility model is a monitoring mechanism for the bending and subsidence zone of a goaf. The installation of the pre-embedded rod assembly is carried out on the ground surface above the coal mining face, which makes the installation simpler and more convenient. By controlling that each of the different overlying rock strata in the goaf contains at least one set of measuring sleeves, the measuring sleeves can be moved when different rock strata undergo subsidence displacement. On this basis, when the locator moves past the measuring sleeve, it can emit an induced current. Based on the time when the locator emits the induced current, the position of the measuring sleeve can be determined, thereby realizing the monitoring of the subsidence displacement of different overlying rock strata in the goaf. Attached Figure Description

[0015] The advantages and solutions of this application will become clear to those skilled in the art upon reading the following detailed description of preferred embodiments. The accompanying drawings are for illustrative purposes only and are not intended to limit the scope of this invention.

[0016] In the attached diagram:

[0017] Figure 1 This is a schematic diagram illustrating the deployment of the monitoring mechanism in the embodiment;

[0018] Figure 2 This is a schematic diagram of the measuring sleeve in the embodiment;

[0019] Figure 3 This is a schematic diagram of the range extender bushing in the embodiment;

[0020] Figure 4 This is a schematic diagram of the locator in the embodiment;

[0021] Figure 5 This is a schematic diagram of the internal structure of the measuring tube in the embodiment;

[0022] Figure 6 This is a schematic diagram of the sealing cap structure in the embodiment;

[0023] Figure 7 This is a schematic diagram of the structure of the counterweight in the embodiment;

[0024] The components represented by the various reference numerals in the diagram are:

[0025] 1. Measuring sleeve; 11. First fitting; 12. Strong magnetic collar; 13. First connecting thread; 2. Extending sleeve; 21. Second fitting; 22. Third fitting; 23. Second connecting thread; 3. Positioner; 31. Measuring tube; 32. Sealing cap; 321. Cover plate; 322. Lifting ring; 323. First connector; 33. Counterweight; 331. Hammer body; 332. Second connector; 34. Positioning module; 35. Induction coil; 36. Third connecting thread; 4. Signal receiver; 5. Signal transmission line; 6. Drive motor. Detailed Implementation

[0026] Exemplary embodiments of this disclosure will now be described in more detail with reference to the accompanying drawings.

[0027] Example

[0028] This embodiment provides a monitoring mechanism for the bending subsidence zone in a goaf area. (See also...) Figure 1 The system includes a measuring component and a vertically installed pre-embedded rod component. The pre-embedded rod component can be vertically arranged in a vertical construction borehole on the surface above the coal mining face. Through the cooperation of the measuring component and the pre-embedded rod component, the monitoring work of the goaf bending and subsidence zone is completed. The structure of the monitoring mechanism (the above-mentioned goaf bending and subsidence zone monitoring mechanism) is described in detail below with reference to the attached drawings.

[0029] In this embodiment, combined with Figure 2 and Figure 3 As one of the core technical concepts of this utility model, the structure of the pre-embedded rod assembly includes several range extender sleeves 2. The range extender sleeves 2 are arranged vertically and there are several of them arranged linearly in the upper and lower parts. A measuring sleeve 1 is connected between each pair of adjacent range extender sleeves 2. The measuring sleeve 1 includes a first pipe fitting 11 that is arranged vertically and whose two ends are respectively connected to the two adjacent range extender sleeves 2. The range extender sleeves 2 are designed to be telescopic.

[0030] First, let's discuss the specific structure of the range extender sleeve 2, in conjunction with... Figure 2 It includes a vertically arranged second pipe 21 and a third pipe 22 coaxially telescopically disposed inside the lower end of the second pipe 21. A limiting member is provided between the two pipes to prevent them from separating. The limiting member includes a first limiting ring fixed to the inner ring of the lower end of the second pipe 21, the inner ring of which is in contact with the outer ring of the third pipe 22. The limiting member also includes a second limiting ring fixed to the outer ring of the upper end of the third pipe 22, the outer ring of which is in contact with the inner ring of the second pipe 21.

[0031] Specifically, regarding the connection structure between the range extender sleeve 2 and the first pipe fitting 11, the first pipe fitting 11 has first connecting threads 13 at both ends, the lower end of the third pipe fitting 22 extends out of the second pipe fitting 21, and the lower end of the third pipe fitting 22 and the upper end of the second pipe fitting 21 are both provided with second connecting threads 23. The first connecting thread 13 at the upper end of the first pipe fitting 11 and the second connecting thread 23 at the lower end of the third pipe fitting 22 are connected in a spiral connection, and the first connecting thread 13 at the lower end of the first pipe fitting 11 and the second connecting thread 23 at the upper end of the second pipe fitting 21 are connected in a spiral connection.

[0032] In this embodiment, combined with Figure 4 and Figure 5 As another core technical concept of this utility model, the measuring component includes a locator 3 that can move vertically inside the extended sleeve 2 and the first pipe fitting 11. The monitoring mechanism also includes a signal receiver 4 that is communicatively connected to the locator 3. A strong magnetic collar 12 is fixed inside the first pipe fitting 11. The locator 3 includes an induction coil 35, which is configured to generate an induced current when passing through the strong magnetic collar 12 and transmit the generated induced current to the signal receiver 4. The installation of the pre-embedded rod assembly is carried out on the ground surface above the coal mining face, which makes the installation simpler and more convenient. By controlling that each of the different overlying rock strata in the goaf contains at least one set of measuring sleeves 1, the measuring sleeves 1 can be moved when different rock strata undergo settlement displacement. On this basis, when the locator 3 moves past the measuring sleeve 1, it can generate an induced current. Based on the time when the locator 3 generates the induced current, the position of the measuring sleeve 1 can be determined, thereby realizing the monitoring of the settlement displacement of different overlying rock strata in the goaf.

[0033] Furthermore, the monitoring mechanism also includes a drive motor 6 connected to the locator 3. The drive motor 6 is configured to uniformly insert the locator 3 into the pre-embedded rod assembly from the top of the pre-embedded rod assembly downwards. By calculating the time from when the locator 3 starts moving from the top of the pre-embedded rod assembly to when the signal receiver 4 receives the signal, and combining the displacement speed of the locator 3, the position (depth) information of the measuring sleeve 1 can be obtained, thereby realizing the monitoring of the settlement information of the corresponding rock strata.

[0034] As a preferred embodiment, to ensure the effective cooperation between the positioner 3 and the measuring sleeve 1, i.e., to ensure the accuracy of the position determination function of the positioner 3, the strong magnetic collar 12 is provided with multiple evenly spaced magnetic collars at intervals along the axial direction of the first pipe fitting 11.

[0035] Furthermore, the drive machine 6 includes a winding machine and a steel wire rope wound on it. The end of the steel wire rope is connected to the positioner 3, and the movement of the winding machine can drive the positioner 3 to move vertically up and down inside the pre-embedded rod assembly.

[0036] In this embodiment, as a preferred implementation, to ensure that the positioner 3 can descend smoothly inside the pre-embedded rod assembly, the lower side of the positioner 3 is tapered or frustoconical.

[0037] Specifically, regarding the structure of the locator 3, in conjunction with Figure 6 and Figure 7 It includes a vertically arranged measuring tube 31, and sealing caps 32 and counterweights 33 respectively located at the upper and lower ends of the measuring tube 31. The induction coil 35 is located inside the measuring tube 31, and the measuring tube 31 can provide protection for the induction coil 35. The lower side of the counterweight 33 is an inverted conical structure with the tip pointing downwards. In order to facilitate the replacement and connection of the induction coil 35, both the sealing caps 32 and the counterweight 33 are threaded to the measuring tube 31.

[0038] Specifically, the measuring tube 31 is provided with a third connecting thread 36 at both the upper and lower ends. The cover plate 321 includes a circular plate 321 with an outer diameter that matches the outer diameter of the measuring tube 31 and is horizontally arranged. The lower side of the cover plate 321 is provided with a first connector 323. The sealing cover 32 is placed on the upper end of the measuring tube 31 by cooperating with the third connecting thread 36 at the upper end of the first connector 323. The upper side of the cover plate 321 is also provided with a lifting ring 322. The end of the wire rope is connected to the lifting ring 322.

[0039] Furthermore, the hammer 33 includes a tapered hammer body 331 with the tip pointing downwards. A second connector 332 is provided on the upper side of the hammer body 331, and the hammer 33 is positioned at the lower end of the measuring tube 31 by the cooperation of the second connector 332 with the third connecting thread 36 at the lower end of the measuring tube 31.

[0040] In this embodiment, the measuring tube 31 is also equipped with a positioning module 34, which is electrically connected to the induction coil 35. The cover plate 321 has a wire hole for the signal transmission line 5 to pass through. The positioning module 34 is connected to the signal receiver 4 on the ground through the signal transmission line 5. When the locator 3 passes through the measuring sleeve 1, the induced current generated by the internal induction coil 35 due to the change in magnetic flux can be transmitted to the positioning module 34. After receiving the electrical signal, the positioning module 34 can transmit the feedback information to the signal receiver 4. That is, the actual function of the positioning module 34 is to convert the electrical signal into a feedback signal that can be recognized by the signal receiver 4. Here, we do not impose too many restrictions on the specific model of the positioning module 34.

[0041] In this embodiment, as a preferred implementation, in order to facilitate the anchoring work between the pre-embedded rod assembly and the drill hole, the outer diameters of the first pipe 11 and the second pipe 21 are the same.

[0042] As a further preferred embodiment, in order to further ensure the anchoring effect of the first pipe fitting 11 and the second pipe fitting 21 in the borehole, and thus ensure that the first pipe fitting 11 can produce corresponding actions when the corresponding rock stratum settles and shifts, the outer surfaces of the first pipe fitting 11 and the second pipe fitting 21 are both rough.

Claims

1. A monitoring mechanism for the bending subsidence zone in a goaf, characterized in that, It includes measuring components and pre-embedded rod components that can be vertically installed in vertical construction boreholes above the coal mining face. The pre-embedded rod assembly includes several range extender sleeves (2), with a first fitting (11) connecting two adjacent range extender sleeves (2), and the range extender sleeves (2) are designed to be telescopic. The measuring assembly includes a positioner (3) that is movable inside the range extender sleeve (2) and the first fitting (11). It also includes a signal receiver (4) that is communicatively connected to the locator (3). A strong magnetic collar (12) is fixed inside the first tube (11). The locator (3) includes an induction coil (35) which is configured to transmit the generated induced current to the signal receiver (4) when passing through the strong magnetic collar (12).

2. The monitoring mechanism for the bending subsidence zone in a goaf according to claim 1, characterized in that, It also includes a drive (6) connected to the locator (3), which is configured to insert the locator (3) into the pre-embedded rod assembly at a constant speed from the top of the pre-embedded rod assembly.

3. The monitoring mechanism for the bending subsidence zone in a goaf according to claim 2, characterized in that, The lower side of the locator (3) is conical or frustum-shaped.

4. The monitoring mechanism for the bending subsidence zone in a goaf according to claim 3, characterized in that, The positioner (3) includes a vertically arranged measuring tube (31), and sealing caps (32) and a counterweight (33) respectively located at its upper and lower ends. The induction coil (35) is located inside the measuring tube (31), and the lower side of the weight (33) is an inverted cone structure with the tip pointing downwards; Both the sealing cap (32) and the counterweight (33) are threadedly connected to the measuring tube (31).

5. A monitoring mechanism for the bending and subsidence zone in a goaf according to claim 1, characterized in that, The range extender sleeve (2) includes a second fitting (21) and a third fitting (22) telescopically disposed inside one end of it, and a limiting member is provided between the two fittings to prevent the two fittings from disengaging.

6. A monitoring mechanism for the bending subsidence zone in a goaf according to claim 5, characterized in that, The first pipe fitting (11) and the second pipe fitting (21) have the same outer diameter.

7. A monitoring mechanism for the bending subsidence zone in a goaf according to claim 5, characterized in that, The outer surfaces of the first pipe fitting (11) and the second pipe fitting (21) are both rough.

8. A monitoring mechanism for the bending subsidence zone in a goaf according to claim 1, characterized in that, Multiple strong magnetic collars (12) are evenly distributed along the axial direction of the first pipe (11).

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