An outer protection anti-bending type mine drilling automatic block clearing and peeping device and method

Abstract

The application discloses a kind of outer protection prevents bending type mine drilling automatic clearing block peeping device and method, belong to coal mine underground drilling monitoring technical field.Device includes peeping imaging device, push drill rod, outer protective sleeve and automatic clearing device, outer protective sleeve is coaxially sleeved in the outside of push drill rod, rigid radial constraint and axial sliding guide are realized by the cooperation of guide groove and guide key, effectively inhibit drill rod bending deflection when deep hole operation, promote propulsion stability and deep hole pass rate.Automatic clearing device is arranged at the front end, adopts rotating mud scraping and annular air blowing double collaborative mode, real-time remove hole coal slime blockage and lens sludge, ensure clear imaging.The application has compact structure, reliable explosion-proof seal, can realize drilling peeping and automatic clearing integrated operation, without manual repeated lifting and clearing block, significantly reduce labor intensity and underground safety risk, improve imaging quality, monitoring accuracy and operation efficiency, suitable for all kinds of drilling imaging monitoring operation in coal mine.

Description

Technical Field

[0001] This invention relates to the field of underground borehole monitoring technology in coal mines, specifically to an automatic unblocking and viewing device and method for mine boreholes with an external protective anti-bending design. Background Technology

[0002] Mining borehole sights are crucial monitoring devices used in coal mines to observe the development of fractures inside boreholes, the fracturing of surrounding rock, the density of grouting, and the possibility of borehole collapse. In practical use, traditional borehole sights mainly suffer from the following problems:

[0003] 1. During deep hole operations, the push drill rod has a large slenderness ratio, which makes it prone to bending and deflection, leading to probe jamming, difficulty in advancing, and even damage to the equipment;

[0004] 2. The high content of coal slime and rock powder in the boreholes of coal roadways and soft rock formations can easily clog the boreholes and block the camera lens, resulting in blurred images and making normal observation impossible;

[0005] 3. Manual unblocking requires repeated lifting and pulling of the drill rod, which is inefficient, labor-intensive, and poses safety hazards.

[0006] In the current technology, there is no integrated device that can simultaneously solve drill pipe bending and automatic hole unblocking. Therefore, developing an improved device with a reliable structure and adaptability to downhole working conditions has important engineering value. Summary of the Invention

[0007] The purpose of this invention is to propose an automatic unblocking and viewing device and method for mining boreholes with an outer protective anti-bend design, which solves the problems of easy bending, easy blockage, blurred imaging, and low efficiency of manual unblocking in traditional mining borehole viewing instruments. By using the rigid guidance of the outer protective sleeve and the automatic unblocking device at the front end, stable deep hole advancement and real-time lens cleaning are achieved, thereby improving monitoring accuracy and operational safety.

[0008] To achieve the above objectives, the technical solution adopted by the present invention is as follows: In the first aspect, the present invention proposes an externally protected anti-bending type automatic unblocking and viewing device for mining boreholes, including a viewing and imaging device, a pusher drill rod, an outer protective sleeve and an automatic unblocking device, wherein the viewing and imaging device is installed at the top of the pusher drill rod, the automatic unblocking device is installed at the top of the viewing and imaging device, and the outer protective sleeve is sleeved on the pusher drill rod.

[0009] The peeping imaging device includes a sealed housing I, a peeping probe, and a peeping imager. The sealed housing I includes upper and lower mounting seats, with a transparent housing connected between the two mounting seats. The peeping probe is installed in the middle of the lower mounting seat. A wire hole is provided inside the push drill rod, and the peeping probe is connected to the peeping imager outside the drill hole via a cable.

[0010] The automatic unblocking device includes a sealed housing II, an explosion-proof micro motor, a rotating scraper, a micro air pump, and an annular nozzle. The sealed housing II is mounted on the upper mounting base. The explosion-proof micro motor is installed in the middle of the interior of the sealed housing II. The rotating scraper is located on the upper exterior of the sealed housing II and is mounted on a rotating shaft, which is shaft-connected to the explosion-proof micro motor. The micro air pump is installed inside the sealed housing II, and the annular nozzles are evenly distributed around the periphery of the sealed housing II.

[0011] The outer sheath has a guide groove in its inner cavity along its length, and a guide key that matches the guide groove is provided along the length of the push drill rod. The guide groove and the guide key cooperate to achieve circumferential positioning and axial guidance between the outer sheath and the push drill rod.

[0012] As a further improvement of the present invention, the outer sheath adopts a segmented structure, and the segments are detachably connected by threads.

[0013] As a further improvement of the present invention, the automatic unblocking device further includes a hole-expanding guide cone, which is located on the upper part of the rotating scraper, and the bottom of the hole-expanding guide cone is rotatably connected to the upper end of the rotating shaft.

[0014] As a further improvement of the present invention, the outer sheath is made of high-strength aluminum alloy or carbon fiber composite material, and the inner wall is provided with a self-lubricating coating.

[0015] As a further improvement of the present invention, the spy probe is a high-definition camera, and a ring of fill lights is arranged around the high-definition camera.

[0016] As a further improvement of the present invention, it also includes a tilt sensor, which is fixed on the lower mounting base of the sealed housing I.

[0017] As a further improvement of the present invention, it also includes a controller, which is electrically connected to the explosion-proof micro motor, micro air pump, peep imager and tilt sensor.

[0018] Secondly, the present invention also proposes an automatic unblocking and inspection method for externally protected, anti-bending type mine boreholes, employing the aforementioned externally protected, anti-bending type mine borehole automatic unblocking and inspection device. The method includes the following steps:

[0019] Step S1. After hydraulic fracturing, wait for the borehole pressure to drop to atmospheric pressure, clean the debris at the borehole opening and check its condition; conduct a comprehensive inspection of the integrity, electrical performance and explosion-proof seals of all components of the equipment to ensure compliance with downhole operation requirements;

[0020] Step S2. Connect the outer casing in sections according to the drilling depth, tighten the threads and ensure the guide groove is aligned, push the front end of the casing to the borehole opening 500mm, and clear the loose coal body at the borehole opening.

[0021] Step S3. The controller sets the unblocking threshold according to the coal slime content, adjusts the rotation speed range of the rotating scraper and the air jet pressure, and sets the staged propulsion distance of the propulsion handle to ensure that the device is adapted to the current working conditions;

[0022] Step S4. Turn on the unblocking device and the viewing imager, push the drill rod in stages, and observe for 3-5 seconds after every 50mm of advance. Combine the tilt sensor data to confirm the probe attitude and image clarity. If the image clarity is lower than the set threshold, the controller will automatically trigger the automatic unblocking device to accelerate the work until the image is clear and focus on observing the crack condition.

[0023] Step S5. When pushing to the predetermined depth or fracture area, lock the drill rod, adjust the supplementary light and obtain a complete fracture image through the image stitching function, and calibrate the parameters; if severe blockage occurs, pause pushing, turn on the automatic unblocking device and work continuously for 3-5 seconds, while slowly pushing the drill rod back and forth to completely remove the blockage of coal slime and rock cuttings, and then continue pushing.

[0024] Step S6. Shut down all systems, pull up the drill pipe and inspection probe at a constant speed, disassemble the outer casing in sections and clean each component, check for wear, classify and store them and transport them to the warehouse for maintenance.

[0025] Compared with the prior art, the present invention has the following technical effects:

[0026] 1. This invention effectively solves the problems of easy bending and deflection of the drill rod during deep hole operations by combining the rigid constraint of the outer sheath with the guide structure, significantly improving the stability of drill rod propulsion and deep hole throughput, avoiding probe jamming, propulsion blockage and equipment damage, and ensuring continuous and smooth drilling and inspection operations.

[0027] 2. This invention employs a dual automatic unblocking device consisting of a rotary scraper and an annular air blower, which reduces sludge adhesion to the transparent shell surface, maintains clear imaging, eliminates the need for repeated manual lifting and unblocking, effectively reduces downhole operation intensity and safety risks, and significantly improves observation and monitoring efficiency and imaging quality.

[0028] 3. The present invention has a compact overall structure and reliable explosion-proof sealing, making it suitable for complex and harsh working conditions in coal mines. It provides precise guidance and positioning with low sliding resistance, ensuring stable viewing direction and accurate monitoring data, while also reducing component wear and extending equipment service life, thus comprehensively improving the safety, reliability, and practicality of mine borehole monitoring. Attached Figure Description

[0029] Figure 1This is a schematic diagram of the overall structure of the externally protected, anti-bending type automatic unblocking and viewing device for mining boreholes of the present invention;

[0030] Figure 2 This is a cross-sectional schematic diagram of the peep imaging device and automatic unblocking device of the present invention;

[0031] Figure 3 This is a schematic diagram of the cross-section of the outer sheath and the guide fitting of the push drill pipe according to the present invention.

[0032] Explanation of reference numerals in the attached drawings: 1-Vision probe; 2-Ring supplementary light; 3-Vision imager; 4-Sealed housing I; 5-Upper mounting base; 6-Lower mounting base; 7-Transparent housing; 8-Sealed housing II; 9-Explosion-proof micro motor; 10-Rotating scraper; 11-Drilling guide cone; 12-Micro air pump; 13-Ring air nozzle; 14-Push drill rod; 15-Wire hole; 16-Guide groove; 17-Guide key; 18-Outer sheath; 19-Advance handle; 20-Hole wall. Detailed Implementation

[0033] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. All other embodiments obtained by those skilled in the art based on the described embodiments of the present invention are within the scope of protection of the present invention.

[0034] like Figures 1-3 As shown, the present invention provides an automatic unblocking and viewing device for mining boreholes with an external protective anti-bending design, comprising a viewing and imaging device, a pusher drill rod 14, an outer protective sleeve 18, and an automatic unblocking device. The main body of the viewing and imaging device is installed at the top of the pusher drill rod 14, the automatic unblocking device is installed at the top of the main body of the viewing and imaging device, and the outer protective sleeve 18 is sleeved on the pusher drill rod 14.

[0035] Specifically, the voyeuristic imaging device includes a sealed housing I4, a voyeuristic probe 1, and a voyeuristic imager 3. The sealed housing I4 includes an upper mounting base 5 and a lower mounting base 6, with a transparent housing 7 connected between the two mounting bases. The voyeuristic probe 1 is mounted in the middle of the lower mounting base 6. A wire hole 15 is provided inside the push drill rod 14, and the voyeuristic probe 1 is connected to the voyeuristic imager 3 outside the borehole via a cable. The transparent housing 7 cooperates with the voyeuristic probe 1, protecting the voyeuristic probe 1 while allowing the voyeuristic probe 1 to observe the state of the borehole wall 20 through the transparent housing. The voyeuristic probe 1 is a high-definition camera, and a ring-shaped supplementary light 2 is arranged around the high-definition camera.

[0036] The automatic unblocking device includes a sealed housing II8, an explosion-proof micro motor 9, a rotating scraper 10, a micro air pump 12, and an annular air nozzle 13. The sealed housing II8 is mounted on the upper mounting base 5. The explosion-proof micro motor 9 is installed in the middle of the sealed housing II8. The rotating scraper 10 is located on the upper part of the sealed housing II8 and is mounted on a rotating shaft, which is shaft-connected to the explosion-proof micro motor 9. The micro air pump 12 is installed inside the sealed housing II8, and the annular air nozzles 13 are evenly distributed around the periphery of the sealed housing II8. An air supply line is provided inside the push drill rod 14, and the air supply line is connected to the annular air nozzles 13.

[0037] Specifically, the automatic unblocking device also includes a hole-expanding guide cone 11, which is located on the upper part of the rotating scraper 10. The bottom of the hole-expanding guide cone 11 and the upper end of the rotating shaft are rotated relative to each other through a bearing.

[0038] The automatic unclogging device of this invention adopts a dual-coordinated unclogging design of rotary scraping and annular air blowing. The rotary scraping component's rotating blades rotate circumferentially, which can quickly scrape off coal slime stains with an adhesion strength ≤0.2MPa. The annular air nozzle forms an annular air curtain through a high-pressure airflow of 0.3-0.5MPa, which simultaneously blows away loose coal slime and rock debris in the hole, effectively solving the problem of blurred imaging caused by coal slime clogging and lens smudges. It eliminates the need for repeated manual pulling of the drill rod for cleaning, reducing the labor intensity of operators.

[0039] The outer sheath 18 has a guide groove 16 along its length, and a guide key 17, which matches the guide groove 16, is provided along the length of the push drill rod 14. The guide groove 16 and the guide key 17 cooperate to achieve circumferential positioning and axial guidance between the outer sheath 18 and the push drill rod 14. Preferably, the outer sheath 18 adopts a segmented structure, and the segments are detachably connected by threads. The outer sheath 18 is made of high-strength aluminum alloy or carbon fiber composite material, and the inner wall is provided with a self-lubricating coating.

[0040] The outer sheath 18 is made of high-strength aluminum alloy or carbon fiber composite material and is coaxially sleeved on the outside of the push drill rod 14. Through precise clearance fit, a rigid radial constraint is formed, which can effectively suppress the radial displacement and bending deformation of the push drill rod 14 with a slenderness ratio ≥25 during the push process in deep holes (hole depth ≥50m). The bending degree is significantly reduced, avoiding probe jamming, push jamming and equipment damage caused by drill rod bending, and greatly improving the continuity and stability of deep hole inspection operations.

[0041] This device also includes a tilt sensor and a controller (not shown in the figure). The tilt sensor is fixed on the lower mounting base 6 of the sealed housing I4. The controller is electrically connected to the explosion-proof micro motor 9, the micro air pump 12, the peep imager 3, and the tilt sensor.

[0042] In this device, the axial guide groove 16 on the inner wall of the outer sheath 18 and the guide key 17 on the outer wall of the push drill rod form a sliding fit. This not only achieves circumferential positioning during the pushing process, preventing the probe torsion angle from exceeding ±3° and ensuring stable viewing and imaging direction, but also guides the push drill rod 14 to advance precisely along the borehole axis, avoiding problems such as imaging distortion and crack positioning deviation caused by probe torsion or offset. Preferably, the inner wall of the outer sheath 18 is coated with a PTFE self-lubricating coating, which can reduce the sliding friction between the drill rod and the casing, reduce component wear, and extend the service life of the casing.

[0043] All electrical components of this invention meet the GB3836 series mining explosion-proof standards, with an explosion-proof rating of ExdIMb, making them suitable for harsh environments with underground gas concentrations ≤1.0% and dust concentrations ≤10mg / m³. The sealing housings I4 and II8 have a sealing rating of IP67, effectively resisting underground moisture and coal slime erosion, and can still operate stably in ambient temperatures of -20~60℃, reducing the operation and maintenance costs of mining equipment and improving the continuity and reliability of testing operations.

[0044] This invention also proposes an automatic unblocking and inspection method for externally protected, anti-bending mine boreholes, comprising the following steps:

[0045] Step S1. After hydraulic fracturing, wait for the borehole pressure to drop to atmospheric pressure, clean the debris at the borehole opening and check its condition; conduct a comprehensive inspection of the integrity, electrical performance and explosion-proof seals of all components of the equipment to ensure compliance with downhole operation requirements.

[0046] Step S2. Connect the outer casing in sections according to the drilling depth. Circumferential positioning pins, positioning grooves, stops or limiting steps are provided between adjacent outer casing sections to ensure that adjacent guide grooves are continuously aligned in the axial direction. Tighten the threads and ensure that the guide grooves are aligned. Push the front end of the casing into the borehole opening by 500mm to clear the loose coal body at the borehole opening.

[0047] Step S3. The controller sets the unblocking threshold according to the coal slime content, adjusts the rotation speed range of the rotating scraper and the air jet pressure, and sets the staged propulsion distance of the propulsion handle to ensure that the device is adapted to the current working conditions.

[0048] Step S4. Turn on the unblocking device and the peep imager, push the drill rod in stages, and observe for 3-5 seconds after every 50mm of advance. Combine the tilt sensor data to confirm the probe posture and image clarity. If the image clarity is lower than the set threshold, the controller will automatically trigger the automatic unblocking device to accelerate the work until the image is clear and focus on observing the crack condition.

[0049] Step S5. When pushing to the predetermined depth or fracture area, lock the drill rod, adjust the supplementary light and obtain a complete fracture image through the image stitching function, and calibrate the parameters; if severe blockage occurs, pause pushing, turn on the automatic unblocking device and work continuously for 3-5 seconds, while slowly pushing the drill rod back and forth to completely remove the blockage of coal slime and rock cuttings, and then continue pushing.

[0050] Step S6. Shut down all systems, pull up the drill pipe and inspection probe at a constant speed, disassemble the outer casing in sections and clean each component, check for wear, classify and store them and transport them to the warehouse for maintenance.

[0051] The embodiments of the present invention have been described in detail above with reference to the accompanying drawings. However, the present invention is not limited thereto. Various changes that can be made within the scope of knowledge possessed by those skilled in the art without departing from the spirit of the present invention are within the protection scope of the claims of the present invention.

Claims

1. An automatic unblocking and viewing device for mining boreholes with an externally protected anti-bending design, characterized in that, It includes a viewing and imaging device, a pusher drill pipe, an outer sheath, and an automatic unblocking device. The viewing and imaging device is installed at the top of the pusher drill pipe, the automatic unblocking device is installed at the top of the viewing and imaging device, and the outer sheath is sleeved on the pusher drill pipe. The peeping imaging device includes a sealed housing I, a peeping probe, and a peeping imager. The sealed housing I includes upper and lower mounting seats, with a transparent housing connected between the two mounting seats. The peeping probe is installed in the middle of the lower mounting seat. A wire hole is provided inside the push drill rod, and the peeping probe is connected to the peeping imager outside the drill hole via a cable. The automatic unblocking device includes a sealed housing II, an explosion-proof micro motor, a rotating scraper, a micro air pump, and an annular nozzle. The sealed housing II is mounted on the upper mounting base. The explosion-proof micro motor is installed in the middle of the interior of the sealed housing II. The rotating scraper is located on the upper exterior of the sealed housing II and is mounted on a rotating shaft, which is shaft-connected to the explosion-proof micro motor. The micro air pump is installed inside the sealed housing II, and the annular nozzles are evenly distributed around the periphery of the sealed housing II. The outer sheath has a guide groove in its inner cavity along its length, and a guide key that matches the guide groove is provided along the length of the push drill rod. The guide groove and the guide key cooperate to achieve circumferential positioning and axial guidance between the outer sheath and the push drill rod.

2. The automatic unblocking and viewing device for mining boreholes with external protection and anti-bending as described in claim 1, characterized in that, The outer sheath adopts a segmented structure, and the segments are detachably connected by threads.

3. The automatic unblocking and viewing device for mining boreholes with external protection and anti-bending as described in claim 2, characterized in that, The automatic unblocking device also includes a hole-expanding guide cone, which is located above the rotating scraper, and the bottom of the hole-expanding guide cone is rotatably connected to the upper end of the rotating shaft.

4. The automatic unblocking and viewing device for mining boreholes with external protection and anti-bending as described in claim 3, characterized in that, The outer sheath is made of high-strength aluminum alloy or carbon fiber composite material, and the inner wall is provided with a self-lubricating coating.

5. The automatic unblocking and viewing device for mining boreholes with external protection and anti-bending as described in claim 4, characterized in that, The spy probe is a high-definition camera, and a ring of fill lights is arranged around the high-definition camera.

6. The automatic unblocking and viewing device for mining boreholes with external protection and anti-bending as described in claim 5, characterized in that, It also includes a tilt sensor, which is fixed on the lower mounting base of the sealed housing I.

7. The automatic unblocking and viewing device for mining boreholes with external protection and anti-bending as described in claim 6, characterized in that, It also includes a controller, which is electrically connected to the explosion-proof micro motor, micro air pump, peep imager and tilt sensor.

8. A method for automatic unblocking and inspection of externally protected, anti-bend type mine boreholes, comprising the externally protected, anti-bend type mine borehole automatic unblocking and inspection device as described in claim 7, characterized in that... Includes the following steps: Step S1. After hydraulic fracturing, wait for the borehole pressure to drop to atmospheric pressure, clean the debris at the borehole opening and check its condition; conduct a comprehensive inspection of the integrity, electrical performance and explosion-proof seals of all components of the equipment to ensure compliance with downhole operation requirements; Step S2. Connect the outer casing in sections according to the drilling depth, tighten the threads and ensure the guide groove is aligned, push the front end of the casing to the borehole opening 500mm, and clear the loose coal body at the borehole opening. Step S3. The controller sets the unblocking threshold according to the coal slime content, adjusts the rotation speed range of the rotating scraper and the air jet pressure, and sets the staged propulsion distance of the propulsion handle to ensure that the device is adapted to the current working conditions; Step S4. Turn on the unblocking device and the viewing imager, push the drill rod in stages, and observe for 3-5 seconds after every 50mm of advance. Combine the tilt sensor data to confirm the probe attitude and image clarity. If the image clarity is lower than the set threshold, the controller will automatically trigger the automatic unblocking device to accelerate the work until the image is clear and focus on observing the crack condition. Step S5. When pushing to the predetermined depth or fracture area, lock the drill rod, adjust the supplementary light and obtain a complete fracture image through the image stitching function, and calibrate the parameters; if severe blockage occurs, pause pushing, turn on the automatic unblocking device and work continuously for 3-5 seconds, while slowly pushing the drill rod back and forth to completely remove the blockage of coal slime and rock cuttings, and then continue pushing. Step S6. Shut down all systems, pull up the drill pipe and inspection probe at a constant speed, disassemble the outer casing in sections and clean each component, check for wear, classify and store them and transport them to the warehouse for maintenance.

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