Coal rock borehole charge sensor adaptive centering positioning device and use method

Abstract

The application discloses a coal rock borehole charge sensor self-adaptive centering positioning device and a use method thereof, which comprises a coal rock charge sensor, a coal rock charge monitor, a cylindrical mounting frame and three radial telescopic centering positioning mechanisms, the coal rock charge sensor is arranged in the cylindrical mounting frame, the three radial telescopic centering positioning mechanisms are uniformly arranged along the circumferential direction of the cylindrical mounting frame, and the coal rock charge monitor is connected with the coal rock charge sensor through wires. The positioning plate can be retracted and reduced in diameter after use, the pressure relief hole is convenient to withdraw, and the engineering practical value is remarkable. The coal rock charge sensor can be automatically arranged in the center of the pressure relief hole without contacting the coal rock body and without blocking the migration channel of the charge sensor. The coal rock charge monitoring quality and the uniformity of the borehole radial range monitoring can be effectively improved, the accuracy of the test value is improved, and the safety of production is ensured.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of coal mine roadway monitoring and early warning equipment, and particularly relates to a coal rock borehole charge sensor self-adaptive centering positioning device and a use method. BACKGROUND

[0002] Coal rock mass deformation and rupture process generates electric charge, and the electric charge signal generated by the coal rock deformation and rupture process is closely related to the coal rock dynamic process, contains a large amount of information about the coal rock deformation and rupture physical and mechanical process, and the change law of the electric charge signal can comprehensively reflect the damage characteristics of the coal rock mass at each stage during the preparation and occurrence of rock burst, so that the occurrence of rock burst can be predicted based on coal rock mass electric charge signal monitoring.

[0003] The material structure of coal rock determines that weak electric charge signals are generated during coal rock deformation and rupture, and due to the limitation of detection technology, it is not easy to be detected. According to the weak electric characteristics, only weak electric observation instruments and methods can be used to discover and extract useful information.

[0004] At present, the coal mine underground often drills pressure relief holes in the roadway side, directly puts the charge sensor into the drill hole, and uses the coal rock charge monitor to monitor the charge induction. However, the working environment of the coal mine underground is complex, with characteristics such as humidity and high coal dust, the charge sensor is a sensitive element, and its contact with coal dust and water vapor will cause charge monitoring distortion, sudden increase of charge, and uneven monitoring in the radial range of the drill hole.

[0005] Therefore, it is very necessary and urgent to develop an auxiliary device that automatically centers the charge sensor in the drill hole without directly contacting the coal rock mass of the drill hole wall. The placement method and position of the charge sensor in the drill hole have a significant impact on the coal rock charge induction law, so the auxiliary device that automatically centers the charge sensor in the drill hole without contacting the coal rock mass and without blocking the migration channel of the charge sensor plays a decisive role in the quality and precision of coal rock charge monitoring. SUMMARY

[0006] To solve the problems of the prior art, the present application provides a coal rock borehole charge sensor self-adaptive centering positioning device and a use method, which automatically centers the coal rock charge sensor in the drill hole without contacting the coal rock mass, and does not block the migration channel of the charge sensor, effectively improving the quality of coal rock charge monitoring and the uniformity of drill hole radial range monitoring.

[0007] To solve the above-mentioned technical problems, the present invention adopts the following technical solution: an adaptive centering positioning device for a coal and rock borehole charge sensor, comprising a coal and rock charge sensor, a coal and rock charge monitor, a cylindrical mounting frame and three radial telescopic centering positioning mechanisms. The coal and rock charge sensor is disposed inside the cylindrical mounting frame, and the three radial telescopic centering positioning mechanisms are evenly arranged along the circumference of the cylindrical mounting frame. The coal and rock charge monitor is connected to the coal and rock charge sensor through wires.

[0008] The cylindrical mounting bracket includes a front ring, a rear ring, and six axial connecting plates. The front and rear rings are aligned front to back. Every two axial connecting plates form a set of parallel sliding groove structures. The three sets of parallel sliding groove structures are evenly arranged along the circumference of the front and rear rings. The two axial connecting plates of each set of parallel sliding groove structures are set in parallel. The inner walls of the two axial connecting plates of each set of parallel sliding groove structures are provided with guide grooves perpendicular to the line connecting the centers of the front and rear rings.

[0009] The three radial telescopic centering positioning mechanisms have the same structure. Each set of parallel slide groove structures is equipped with one radial telescopic centering positioning mechanism. Each radial telescopic centering positioning mechanism includes a support plate, a miniature cylinder, and a positioning plate. The inner side of the positioning plate is flush with the inner side of the axial connecting plate. The support plate is fixed between the middle of the two parallel axial connecting plates. The miniature cylinder is parallel to the guide groove. The inner end of the cylinder body of the miniature cylinder is fixed to the support plate. The positioning plate is slidably connected between the two parallel axial connecting plates. The two sides of the positioning plate are integrally provided with guide strips that slide with the guide groove. The miniature cylinder is connected to the air pressure control system through a high-pressure air pipe.

[0010] The support plate has a light hole, and the inner end of the cylinder of the miniature cylinder has a limiting ring on the outer circle. The inner end of the cylinder of the miniature cylinder passes through the light hole and is threaded to a fastening nut. The fastening nut is pressed against the inner side of the support plate, and the limiting ring is pressed against the outer side of the support plate. The inner side of the positioning plate has a threaded hole, and the piston rod of the miniature cylinder extends into and is threaded into the threaded hole.

[0011] The outer shell of the coal and rock charge sensor is cylindrical, and the coal and rock charge sensor is coaxially arranged in a hollow cylindrical space enclosed by six axial connecting plates between the front and rear rings.

[0012] A method for using an adaptive centering positioning device for a coal and rock borehole charge sensor includes the following steps:

[0013] (1) Drill pressure relief holes in underground roadways of coal mines according to technical parameters;

[0014] (2) Install the radial telescopic centering positioning mechanism between the two axial connecting plates of the parallel slide structure;

[0015] (3) the coal and rock charge sensor from the front ring into the six axial connecting plate enclosed into the hollow cylindrical space, so that the coal and rock charge sensor and the cylindrical mounting frame are fixed as a whole, and then the coal and rock charge sensor front end is connected with the coal and rock charge monitor through the wire;

[0016] (4) the whole is directly put into the pressure relief hole, the gas pressure control system is operated, the piston rods of the three micro-cylinders are synchronously elongated, the three positioning plates are synchronously moved outward along the radial direction, until the positioning plates are in contact with the pressure relief hole wall, so that the coal and rock charge sensor is automatically centered and fixed in the pressure relief hole;

[0017] (5) the coal and rock charge monitor is started, the signal monitored by the coal and rock charge sensor in the pressure relief hole is received, and the charge induction monitoring is carried out.

[0018] The specific process of step (2) is as follows: first, the piston rod screw of the micro-cylinder is connected to the threaded hole on the positioning plate, then the positioning plate is inserted into the assembly between the two axial connecting plates, the guide bar is inserted into the guide groove, until the cylinder body end of the micro-cylinder passes through the light hole on the support plate, then the fastening nut is screwed to the cylinder body end, the wrench is used to clamp the fastening nut, the cylinder body is positioned and fastened, and the high-pressure gas pipe connected with the cylinder body of the micro-cylinder is pulled out forward along the two axial connecting plates inside the positioning plate.

[0019] By adopting the above technical scheme, the present application has the following beneficial effects:

[0020] 1、The present application has scientific principle, simple structure, easy manufacturing and convenient installation, and the positioning plate can be retracted after use, which is convenient for withdrawing from the pressure relief hole, and has significant engineering practical value.

[0021] 2、The present application can realize automatic centering arrangement of the coal and rock charge sensor in the pressure relief hole without contacting the coal and rock body, and does not block the migration channel of the charge sensor.

[0022] 3、The present application can effectively improve the coal and rock charge monitoring quality and the uniformity of the radial range monitoring of the drill hole, improve the accuracy of the test value, and provide safety guarantee for production. BRIEF DESCRIPTION OF DRAWINGS

[0023] Figure 1 It is a schematic diagram for coal and rock charge monitoring site application.

[0024] Figure 2 It is a perspective view of the cylindrical mounting frame.

[0025] Figure 3 It is a perspective view of the positioning plate.

[0026] Figure 4 It is Figure 1 an enlarged view of the middle cylindrical mounting frame.

[0027] Figure 5 Figure 1 is a schematic diagram of the installation between the micro-cylinder and the support plate. DETAILED DESCRIPTION

[0028] As shown in Figures 1-5 Figure 1, the adaptive center positioning device of the coal rock drilling charge sensor of the present application comprises a coal rock charge sensor 1, a coal rock charge monitor 2, a cylindrical mounting frame, and three radial telescopic center positioning mechanisms. The coal rock charge sensor 1 is arranged inside the cylindrical mounting frame, the three radial telescopic center positioning mechanisms are uniformly arranged along the circumferential direction of the cylindrical mounting frame, and the coal rock charge monitor 2 is connected to the coal rock charge sensor 1 through a wire 4.

[0029] The cylindrical mounting frame comprises a front circular ring 5, a rear circular ring 6, and six axial connecting plates 7. The front circular ring 5 and the rear circular ring 6 correspond to each other in front and back, each two axial connecting plates 7 form a set of parallel sliding groove structures, and three sets of parallel sliding groove structures are uniformly arranged along the circumferential direction of the front circular ring 5 and the rear circular ring 6. The two axial connecting plates 7 of each set of parallel sliding groove structures are arranged in parallel, and the inner walls of the two axial connecting plates 7 of each set of parallel sliding groove structures are provided with a guide groove 8 perpendicular to the center line of the front circular ring 5 and the rear circular ring 6.

[0030] The three radial telescopic center positioning mechanisms are the same in structure, one radial telescopic center positioning mechanism is arranged in each set of parallel sliding groove structures, each radial telescopic center positioning mechanism comprises a support plate 9, a micro-cylinder 10, and a positioning plate 11, the inner side surface of the positioning plate 11 is flush with the inner side edge of the axial connecting plate 7, the support plate 9 is fixedly arranged between the middle portions of the two parallel axial connecting plates 7, the micro-cylinder 10 is parallel to the guide groove 8, the inner end of the cylinder body of the micro-cylinder 10 is fixed on the support plate 9, the positioning plate 11 is slidingly connected between the two parallel axial connecting plates 7, and guide strips 12 that slidingly cooperate with the guide groove 8 are integrally arranged on the two side surfaces of the positioning plate 11. The micro-cylinder 10 is connected to a gas pressure control system (not shown in the figure) through a high-pressure gas pipe.

[0031] A light hole is formed in the support plate 9, a limiting ring 13 is arranged on the outer circle of the inner end of the cylinder body of the micro-cylinder 10, the inner end of the cylinder body of the micro-cylinder 10 passes through the light hole and is threadedly connected to a fastening nut 14, the fastening nut 14 is press-bonded to the inner side surface of the support plate 9, the limiting ring 13 is press-bonded to the outer side surface of the support plate 9, a threaded hole 15 is formed in the inner side edge of the positioning plate 11, and the piston rod of the micro-cylinder 10 extends into and is threadedly connected to the threaded hole 15.

[0032] The outer shell of the coal rock charge sensor 1 is in the shape of a cylindrical body, and the coal rock charge sensor 1 is coaxially arranged in the hollow cylindrical space enclosed by the six axial connecting plates 7 between the front circular ring 5 and the rear circular ring 6.

[0033] A use method of the adaptive center positioning device of the coal rock drilling charge sensor, comprising the following steps:

[0034] (1) in the coal mine roadway, according to technical parameters to coal 3 drilling pressure relief hole 16;

[0035] (2) the radial telescopic center positioning mechanism is installed between the two axial connecting plates 7 of the parallel sliding groove structure;

[0036] (3) the coal and rock charge sensor 1 is inserted into the hollow cylindrical space surrounded by the six axial connecting plates 7 from the front ring 5, so that the coal and rock charge sensor 1 and the cylindrical mounting frame are fixed as a whole, and then the coal and rock charge sensor 1 is connected with the coal and rock charge monitor 2 through the wire 4;

[0037] (4) the assembled whole is directly put into the pressure relief hole 16, the gas pressure control system is operated, the piston rods of the three micro-cylinders 10 are synchronously elongated, the three positioning plates 11 are synchronously moved outward along the radial direction, until the positioning plates 11 are in contact with the hole wall of the pressure relief hole 16, so that the coal and rock charge sensor 1 is automatically centered and fixed in the hole;

[0038] (5) the coal and rock charge monitor 2 is started, the signal monitored by the coal and rock charge sensor 1 in the pressure relief hole 16 is received, and the charge induction monitoring is carried out.

[0039] The specific process of step (2) is as follows: first, the piston rod of the micro-cylinder 10 is screwed into the threaded hole 15 on the positioning plate 11, then the positioning plate 11 is inserted and assembled between the two axial connecting plates 7, the guide bar 12 is inserted into the guide groove 8, until the cylinder body end of the micro-cylinder 10 passes through the light hole on the support plate 9, then the fastening nut 14 is screwed to the cylinder body end, the wrench is used to hold the fastening nut 14, the cylinder body is positioned and fastened, and the high-pressure gas pipe connected with the cylinder body of the micro-cylinder 10 is pulled out forward along the two axial connecting plates 7 inside the positioning plate 11.

[0040] The above only describes the preferred embodiments of the present application, and the front, back, left, right and other directions are not used to limit the present application. Although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments, or equivalently replace some technical features, as long as they are within the spirit and principles of the present application. Any modification, equivalent replacement, improvement, etc. made within the scope of the present application should be included in the protection scope of the present application.

Claims

1. An adaptive centering positioning device for a coal and rock borehole charge sensor, characterized in that: The coal rock charge sensor, the coal rock charge monitor, the cylindrical mounting frame and three radial telescopic central positioning mechanisms are included, the coal rock charge sensor is arranged inside the cylindrical mounting frame, the three radial telescopic central positioning mechanisms are evenly arranged along the circumferential direction of the cylindrical mounting frame, and the coal rock charge monitor is connected with the coal rock charge sensor through wires. The cylindrical mounting frame includes a front circular ring, a rear circular ring and six axial connecting plates, the front circular ring and the rear circular ring correspond to each other, each two axial connecting plates form a parallel sliding groove structure, and three parallel sliding groove structures are evenly arranged along the circumferential direction of the front circular ring and the rear circular ring; the two axial connecting plates of each parallel sliding groove structure are arranged in parallel, and the inner walls of the two axial connecting plates of each parallel sliding groove structure are provided with guide grooves perpendicular to the center line of the front circular ring and the rear circular ring; The three radial telescopic central positioning mechanisms are the same in structure, one radial telescopic central positioning mechanism is arranged in each parallel sliding groove structure, each radial telescopic central positioning mechanism includes a support plate, a micro-cylinder and a positioning plate, the inner side of the positioning plate is flush with the inner side of the axial connecting plate, the support plate is fixedly arranged between the middle portions of the two parallel axial connecting plates, the micro-cylinder is parallel to the guide groove, the inner end of the cylinder body of the micro-cylinder is fixed on the support plate, the positioning plate is slidably connected between the two parallel axial connecting plates, and guide rods that are slidably connected with the guide grooves are integrally arranged on the two side faces of the positioning plate; the micro-cylinder is connected with the gas pressure control system through a high-pressure gas pipe. A light hole is formed in the support plate, a limiting ring is arranged on the outer circle of the inner end of the cylinder body of the micro-cylinder, the inner end of the cylinder body of the micro-cylinder penetrates through the light hole and is threadedly connected with a fastening nut, the fastening nut is press-connected with the inner side of the support plate, the limiting ring is press-connected with the outer side of the support plate, a threaded hole is formed in the inner side of the positioning plate, and the piston rod of the micro-cylinder extends into and is threadedly connected in the threaded hole.

2. The self-adaptive centering device for a coal or rock borehole charge sensor according to claim 1, characterized in that: The shell of the coal rock charge sensor is in the shape of a cylinder, and the coaxial line of the coal rock charge sensor is arranged in the hollow cylindrical space enclosed by the six axial connecting plates between the front circular ring and the rear circular ring.

3. The method for using the self-adaptive centering positioning device of the coal rock borehole charge sensor according to claim 1 or 2, characterized in that: The method includes the following steps: (1) drilling a pressure relief hole in a coal mine tunnel according to technical parameters; (2) installing the radial telescopic central positioning mechanism between the two axial connecting plates of the parallel sliding groove structure; (3) inserting the coal rock charge sensor into the hollow cylindrical space enclosed by the six axial connecting plates from the front circular ring, so that the coal rock charge sensor and the cylindrical mounting frame are fixed as a whole, and then connecting the front end of the coal rock charge sensor with the coal rock charge monitor through wires; (4) directly placing the assembled whole into the pressure relief hole, operating the gas pressure control system, synchronously extending the piston rods of the three micro-cylinders, synchronously moving the three positioning plates radially outward, until the positioning plates are in contact with the top of the pressure relief hole, so that the coal rock charge sensor is automatically centered and fixed in the hole; (5) starting the coal rock charge monitor to receive the signals monitored by the coal rock charge sensor in the pressure relief hole and perform charge induction monitoring.

4. The use of a coal rock borehole charge sensor self-adapting centering positioning device according to claim 3, characterized in that: The specific process of step (2) is as follows: firstly, the piston rod screw of the micro cylinder is connected to the threaded hole on the positioning plate; then the positioning plate is extended to be assembled between the two axial connecting plates; the guide bar is inserted into the guide groove correspondingly until the cylinder body end of the micro cylinder passes through the light hole on the support plate; then the fastening nut is screwed to the cylinder body end; the wrench is used to hold the fastening nut; the cylinder body is positioned and fastened; and the high-pressure gas pipe connected with the cylinder body of the micro cylinder is passed out forward along the two axial connecting plates inside the positioning plate.

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