Drilling device in coal mine construction

Abstract

The invention provides a drilling device in coal mine construction. The drilling device in coal mine construction comprises drilling equipment and a blowout preventer. The drilling equipment comprises a drilling machine body and a plurality of drill rods. A directional drilling frame group is also assembled on the primary drill rod; the blowout preventer comprises a steel casing and a positioning plate. A working hole site communicating with the interior of the steel casing is formed in the positioning plate, hydraulic cavities are formed in the positioning plate in a crossed mode, and a sector plate capable of extending into the working hole site is slidably connected to the interior of each hydraulic cavity; an arc-shaped cavity matched with the drill rod is formed in the end of each fan-shaped plate, and a plurality of elastic balls are rotationally connected into the arc-shaped cavities. According to the method, the drilling guide deviation prevention effect is provided through the directional drilling frame set, and the position of the aquifer is accurately detected; and the sector plate assists in providing drilling accuracy, and achieves the purpose of quickly blocking and stopping water, so that accidents are avoided.

Description

Technical Field

[0001] The present application relates to the technical field of coal mine drilling, and in particular to a drilling device used in coal mine construction. Background Art

[0002] Safety is always the top priority during coal mine construction. Among them, water damage is one of the major threats faced by coal mining. Due to the complex stratum structure of coal mines and the widespread distribution of aquifers, during the construction process, such as when digging in underground tunnels, if water damage cannot be effectively prevented, it is very likely to cause serious accidents such as flooding of wells and working faces, which will not only lead to the stagnation of coal mine production, but also pose a huge threat to the lives and safety of miners, and cause huge economic losses.

[0003] When excavating in underground tunnels, advance water exploration and drainage is a key process in coal mine construction. Through advance water exploration and drainage, the hydrogeological conditions in front of the construction area can be understood in advance, and whether there are hidden dangers of water damage can be predicted so that corresponding measures can be taken. In some mines that are severely affected by water damage, it is not enough to just conduct water exploration and drainage, and grouting transformation of the aquifer is also required. Grouting transformation of the aquifer can effectively block the water-conducting channels such as cracks and pores in the aquifer, reduce the permeability of the aquifer, and thus reduce the possibility of water damage.

[0004] Whether it is to explore and release water or to inject grout to transform aquifers, a large number of boreholes need to be constructed to expose the aquifers. During the drilling process, in order to accurately explore the aquifers, the drilling accuracy of the boreholes must be ensured. After the initial positioning of the drilling angle, the drill rod is continuously lengthened in the later stage, causing the drill rod to be twisted during the drilling process, or the drill bit encounters a hard layer and causes drilling deviation. As the drilling distance continues to increase, the positioning of the explored aquifer is not accurate.

[0005] Moreover, once the borehole exposes the aquifer and the water output is large, if the water spraying cannot be effectively controlled in time, it is easy to cause an accident. Therefore, it is particularly important to install a blowout preventer at the orifice. The traditional borehole blowout preventer usually has a relatively simple structure. It mainly sets a leather ring on the outside of the drill rod, which has a certain elasticity and sealing. When the borehole is normally constructed and the water output is small, the drill rod can rotate smoothly in the leather ring without causing obvious impact on the construction. However, when the water output of the borehole is large and exceeds the normal control range, it is necessary to activate the blowout preventer function of the blowout preventer. At this time, the worker needs to operate multiple bolts on the outside of the leather ring. By tightening these bolts, the bolts will gradually apply pressure to the leather ring. Because the leather ring is elastic, the leather ring will gradually shrink and hold the drill rod under the extrusion of the bolts. In this way, the water in the borehole can be reduced to a certain extent from spraying out from the middle of the gate valve and the drill rod. In this way, the purpose of controlling the water volume is attempted to prevent a large amount of water from gushing out of the borehole and causing accidents.

[0006] The operation process of traditional blowout preventers is relatively cumbersome when dealing with large amounts of water coming out of holes. Workers are required to tighten multiple bolts one by one, which takes a long time. In coal mine construction, especially in emergency situations with large amounts of water coming out of boreholes, time is life. Every extra second of delay may dramatically increase the risk of water disasters. For example, in some mines with complex geological conditions and high water pressure in the aquifer, once the borehole penetrates the aquifer, water may gush out in large quantities in an instant. At this time, if the blowout preventer cannot be started quickly and the water volume cannot be effectively controlled, the water may quickly flood the working face or even spread to the entire mine tunnel. The process of tightening multiple bolts may delay the best control time, causing accidents that could have been avoided to eventually occur.

[0007] Since it takes a certain amount of time to tighten the bolts, the water output from the borehole cannot be effectively and timely contained during this period of time. Even if all the bolts are tightened and the leather ring holds the drill rod tightly, a large amount of water has already flowed out during this process, which may have caused serious damage to the construction environment. Moreover, as the water continues to flow out, the ground in the construction area may become slippery, which will not only affect the normal operation of the workers, but may also cause workers to slip and get injured. At the same time, a large amount of water may also wash away some temporary support facilities, further exacerbating the safety hazards in the construction area.

[0008] Because the water cannot be quickly controlled, the entire construction area is in a dangerous state. On the one hand, the large outflow of water may cause the abnormal escape of harmful gases such as gas, increasing the risk of secondary disasters such as gas explosions. On the other hand, if the water is too strong, it may destroy the equipment around the borehole, such as drilling rigs, etc. These equipment may be damaged by the impact of the water flow and cause harm to the surrounding personnel. In addition, long-term water outflow may also affect the stability of the surrounding rock of the mine tunnel, causing accidents such as tunnel collapse. Summary of the invention

[0009] The present application provides a drilling device for coal mine construction, which has a good directional drilling effect, can accurately and reliably detect the location of the aquifer, and avoids deviation; the blowout prevention device provided can ensure auxiliary positioning drilling while having an efficient and convenient blocking effect to avoid accidents.

[0010] The present application provides a drilling device for coal mine construction, including a drilling device for drilling holes in tunnels to explore aquifers, and a blowout prevention device installed at the orifice of the borehole; the drilling device includes: a drilling machine body, a multi-section drill rod installed on the drilling machine body, and a drill bit connected to the initial section drill rod; the initial section drill rod is sleeved with a mounting sleeve, the interior of the mounting sleeve is equipped with a water pressure sensor, and a wireless signal transmitter for transmitting the water pressure information of the aquifer detected by the water pressure sensor to the drilling machine body; the initial section drill rod is also equipped with a directional drilling frame group; the directional drilling frame group is The drilling frame assembly comprises: a first ring plate and a second ring plate; a plurality of folding rod groups are connected between the first ring plate and the second ring plate, the first ring plate is rotatably connected to the primary drill rod, and the second ring plate is slidably and rotatably connected to the primary drill rod; a friction wheel group in contact with the wall of the drill hole is symmetrically mounted on a side of the second ring plate facing away from the first ring plate; when the friction wheel group moves in a first direction, the friction wheel group and the wall of the drill hole are stopped and rubbed, and the folding rod group is in an unfolded state; when the friction wheel group moves in a second direction, the friction wheel group and the wall of the drill hole are rollingly contacted The folding rod group is in a folded state; the blowout prevention device comprises: a steel casing inserted into the borehole, and a positioning plate connected to the exposed end of the steel casing; a working hole connected to the interior of the steel casing is provided on the positioning plate, and a hydraulic chamber is cross-shaped inside the positioning plate, and a fan-shaped plate that can extend to the working hole is slidably connected to the interior of each hydraulic chamber; an arc-shaped cavity adapted to the drill rod is provided at the end of each fan-shaped plate, and a plurality of elastic balls are rotatably connected to the interior of the arc-shaped cavity; wherein any two opposite hydraulic chambers are connected to the same oil delivery chamber. pipeline, and two oil pipelines are respectively connected to the hydraulic system of the drilling machine body; when the drilling machine body drives the drill rod to rotate and move, the hydraulic system pumps oil to a corresponding oil pipeline, and the corresponding two fan-shaped plates approach each other to press and position the drill rod, and a plurality of elastic balls are in rolling contact with the outer wall of the drill rod; when the pressure information of the water pressure sensor received by the drilling machine body exceeds a set threshold, the hydraulic system pumps oil to the two oil pipelines, the arc-shaped cavities of the four fan-shaped plates embrace the drill rod, the plurality of elastic balls shrink to the inside of the corresponding arc-shaped cavities, and the four fan-shaped plates seal the working holes.

[0011] In the present application, after the drilling angle is determined by the drilling machine body, preliminary drilling is carried out and then the blowout preventer is installed; then the drill rod is continuously lengthened to explore the waterproof layer. As the depth of the drill rod continues, the directional drilling frame group provides a stable drilling angle guarantee. During the rotation of the drill rod, a rotational connection relationship is formed with the first ring plate and the second ring plate. The friction wheel group forms a stopping friction during the movement along the borehole. The spacing between the first ring plate and the second ring plate is lengthened to ensure a high anti-bias property; at the same time, when drilling deeper boreholes, the two fan-shaped plates are brought closer to each other so that the drill rod is located at the center of the steel casing for drilling to avoid distortion; after the aquifer is explored, the water pressure sensor receives the pressure information, the first ring plate and the second ring plate form a preliminary water barrier, and the hydraulic system pumps oil to the four hydraulic chambers to quickly seal the working hole position, thereby achieving rapid water stopping and avoiding accidents. The overall drilling process is accurate and the water stopping effect is efficient and convenient.

[0012] In a specific possible implementation scheme, both the first ring plate and the second ring plate are perforated plates with water-permeable holes, so as to have water-permeable properties, and realize the drainage function of water seepage during the drilling process without affecting the drilling process.

[0013] In a specific implementation method, the first ring plate is fixedly sleeved on the primary drill pipe through a double-row roller bearing to achieve a stable rotation connection relationship.

[0014] In a specific implementation scheme, the second ring plate is provided with a mounting through hole, and a plurality of universal balls are arranged circumferentially on the inner wall of the mounting through hole, so as to achieve a slidable and rotatable connection to the drill rod.

[0015] In a specific implementation scheme, the folding rod group includes: a first connecting rod rotatably connected to the first ring plate, and a second connecting rod rotatably connected to the second ring plate; wherein the first connecting rod and the second connecting rod are connected by a rotating shaft at one end facing each other. This can be adapted to increase the drilling guide distance and prevent drilling deviation.

[0016] In a specific implementation scheme, a plurality of adaptive telescopic rods are connected between the first ring plate and the second ring plate, so that the connection performance is more stable and reliable.

[0017] In a specific implementation scheme, the friction wheel set is connected to the second ring plate through a hinge rod, and the second ring plate is provided with a plurality of springs connected to the hinge rod, which has strong elasticity and flexibility, so that the friction wheel set can contact the wall of the drill hole more comprehensively.

[0018] In a specific embodiment, the friction wheel set is a wheel set with a ratchet structure, which realizes one-way rotation and facilitates exiting the drilling hole.

[0019] In a specific possible implementation scheme, a plurality of anchor holes are provided on the positioning plate, and positioning is achieved through the anchor holes, making installation and positioning more convenient.

[0020] In a specific implementation scheme, the two oil delivery pipelines are: a first pipeline connecting two hydraulic chambers opposite to each other, and a second pipeline connecting two hydraulic chambers opposite to each other; wherein the first pipeline is connected to a first quick-connect valve connected to the hydraulic system, and the second pipeline is connected to a second quick-connect valve connected to the hydraulic system. It has the purpose of assisting positioning and quickly and conveniently blocking the working hole to avoid accidents. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 A schematic diagram of the working state of a drilling device in coal mine construction provided in an embodiment of the present application; Figure 2 A schematic diagram of the structure of the installation sleeve provided in an embodiment of the present application; Figure 3 A schematic diagram of a first state of a directional drilling frame assembly provided in an embodiment of the present application; Figure 4 A schematic diagram of a second state of a directional drilling frame assembly provided in an embodiment of the present application; Figure 5 A schematic diagram of the structure of the second ring plate provided in an embodiment of the present application; Figure 6 A schematic diagram of the structure of the blowout prevention device provided in an embodiment of the present application; Figure 7 A schematic diagram of a first embodiment of a blowout prevention device provided in the present application; Figure 8 A schematic diagram of a second embodiment of the blowout prevention device provided in the present application; Fig. 9 A schematic diagram of a third embodiment of the blowout prevention device provided in the present application; Fig.10 A schematic diagram of the structure of the fan-shaped plate provided in an embodiment of the present application.

[0022] Figure Number: Laneway - 100; Drilling machine body-200, hydraulic system-210; Blowout prevention device 300, positioning plate 310, anchor hole 311, working hole 312, first quick-connect valve 313, first pipeline 3131, second quick-connect valve 314, second pipeline 3141, hydraulic chamber 315, fan plate 316, sliding plate 3161, rubber layer 3162, arc cavity 3163, elastic ball 3164, pressure spring 3165, steel casing 320; Drilling - 400; Drill rod - 500; Initial drill rod 600, installation sleeve 610, drill bit 620, water pressure sensor 630, wireless signal transmitter 640, directional drilling frame assembly 650, first ring plate 651, double row roller bearing 6511, second ring plate 652, universal ball 6521, water permeable hole 6522, folding rod assembly 653, adaptive telescopic rod 654, hinged rod 655, friction wheel assembly 656, spring 657. DETAILED DESCRIPTION

[0023] In order to make the objectives, technical solutions and advantages of the present application clearer, the present application will be further described in detail below in conjunction with the accompanying drawings.

[0024] It should be noted that, unless otherwise defined, the technical terms or scientific terms used in one or more embodiments of this specification should be understood by people with ordinary skills in the field to which this disclosure belongs. The "first", "second" and similar words used in one or more embodiments of this specification do not indicate any order, quantity or importance, but are only used to distinguish different components. "Include" or "comprise" and similar words mean that the elements or objects appearing before the word cover the elements or objects listed after the word and their equivalents, without excluding other elements or objects. "Connect" or "connected" and similar words are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "Up", "down", "left", "right" and the like are only used to indicate relative positional relationships. When the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0025] In order to facilitate the understanding of the drilling device in coal mine construction provided by the embodiment of the present application, its application scenario is first explained. The drilling device in coal mine construction is mainly used in the field of coal exploration technology. Whether it is to explore and release water or to grout to transform the aquifer, a large number of boreholes need to be constructed to expose the aquifer. In the process of drilling construction, in order to accurately explore the aquifer, it is necessary to ensure the drilling accuracy of the borehole. After the initial positioning of the drilling angle, due to the continuous lengthening of the drill rod in the later stage, the drill rod is twisted during the drilling process, or the drill bit encounters the hard layer and the drilling deviation occurs. With the continuous depth of the drilling distance, the positioning of the explored aquifer is not accurate. In addition, once the borehole exposes the aquifer and the water output is large, if the water spray cannot be effectively controlled in time, it is easy to cause an accident. Therefore, it is particularly important to install a blowout preventer at the orifice. The traditional blowout preventer at the orifice of the drilling hole usually has a relatively simple structure. It mainly sets a leather ring on the outside of the drill rod, and this leather ring has certain elasticity and sealing. When the drilling is normal and the water output is small, the drill rod can rotate smoothly in the leather ring without causing obvious impact on the construction. However, when the water output of the drilling is large and exceeds the normal control range, the blowout prevention function of the blowout preventer needs to be activated. At this time, the worker needs to operate multiple bolts located outside the leather ring. By tightening these bolts, the bolts will gradually apply pressure to the leather ring. Because the leather ring is elastic, the leather ring will gradually shrink and hold the drill rod under the squeeze of the bolts. In this way, the water in the borehole can be reduced to a certain extent from spraying out from between the gate valve and the drill rod. In this way, the purpose of controlling the water volume is attempted to prevent a large amount of water from gushing out of the borehole and causing accidents. The operation process of the traditional blowout preventer is relatively cumbersome when dealing with large water output. Workers are required to tighten multiple bolts one by one, which takes a long time. In coal mine construction, especially in emergency situations with large water output from the drilling hole, time is life. Every extra second of delay may increase the risk of water disasters sharply. If the blowout preventer cannot be started quickly and the water volume cannot be effectively controlled, the water may quickly flood the working face and even spread to the entire mine tunnel. The process of tightening multiple bolts may delay the best control time, causing accidents that could have been avoided to eventually occur. Because the water cannot be quickly controlled, the entire construction area is in a dangerous state. On the one hand, a large amount of water may cause the escape of harmful gases such as gas to be abnormal, increasing the risk of secondary disasters such as gas explosions. On the other hand, if the water is too strong, it may destroy equipment around the borehole, such as drilling rigs, which may be damaged and cause harm to surrounding personnel under the impact of the water flow. In addition, long-term water outflow may also affect the stability of the surrounding rock of the mine tunnel, causing accidents such as tunnel collapse. In view of this, the drilling device in the coal mine construction in this application has a good directional drilling effect, and the location of the aquifer is accurately and reliably explored to avoid deviation; the blowout preventer provided has an efficient and convenient blocking effect while ensuring auxiliary positioning drilling to avoid accidents.

[0026] refer to Figure 1 The drilling device in coal mine construction provided in the embodiment of the present application includes: a drilling device for drilling holes in the tunnel 100 to explore the aquifer; the drilling device includes: a drilling machine body 200, a multi-section drill rod 500 mounted on the drilling machine body 200, and a drill bit 620 connected to the primary drill rod 600; the drilling machine body 200 in the present application adopts a crawler drilling machine, which can be applied to different coal mine tunnels 100, and the distribution of the aquifer is explored by drilling holes 400, so as to provide preventive measures for the subsequent tunnel 100 excavation. The drilling machine body 200 achieves the purpose of exposing the aquifer by adding a multi-section drill rod 500. The drill bit 620 is mounted on the primary drill rod 600, and the primary drill rod 600 in the present application is equipped with a sensor component for exploring the aquifer pressure, providing data reference for subsequent treatment, and ensuring a high treatment and prevention effect.

[0027] Combination Figure 2 As shown in the figure, the primary drill pipe 600 is provided with an installation sleeve 610, and the installation sleeve 610 is provided with a water pressure sensor 630 and a wireless signal transmitter 640 for transmitting the water pressure information of the aquifer detected by the water pressure sensor 630 to the drilling machine body 200. Through wireless signal transmission, when the drill bit 620 drills into the aquifer, as the installation sleeve 610 goes deeper, the water pressure sensor 630 detects the pressure of the aquifer, providing reference data for subsequent treatment and prevention. At the same time, the operator on the drilling machine body 200 timely adjusts the orifice of the borehole 400 according to the received water pressure data to avoid water damage. The aquifer is widely distributed and irregular. With the continuous in-depth exploration, the drill pipe 500 is continuously lengthened. Due to the geological reasons inside the borehole 400 or the twisting change of the drill pipe 500 in a long state, the drilling accuracy is poor and it does not have good guiding performance. To this end, the initial section drill rod 600 in the present application is also equipped with a directional drilling frame assembly 650; the directional drilling frame assembly 650 is used to support and guide the inner wall of the borehole 400 during the continuous drilling process of the drill bit 620, and to achieve more precise guiding operations based on the initially set drilling angle, thereby ensuring that the drilling angle is within a reasonable deviation range, thereby accurately locating the position of the aquifer and providing reliable reference data for subsequent management and prevention.

[0028] Combination Figure 3 and Figure 4As shown in, the directional drilling frame group 650 includes: a first ring plate 651 and a second ring plate 652; the first ring plate 651 and the second ring plate 652 are both perforated plates with water-permeable holes 6522. It has water-permeable performance, does not affect the drilling process, and realizes the drainage function of water seepage during the drilling process. A plurality of folding rod groups 653 are connected between the first ring plate 651 and the second ring plate 652; the folding rod group 653 includes: a first connecting rod rotatably connected to the first ring plate 651, and a second connecting rod rotatably connected to the second ring plate 652; wherein, the first connecting rod and the second connecting rod are connected at one end facing each other by a rotating shaft. It can adapt to increase the drilling guide distance and prevent drilling deviation. In addition, a plurality of adaptive telescopic rods 654 are connected between the first ring plate 651 and the second ring plate 652. The connection performance is more stable and reliable. In the present application, the connection stability of the first ring plate 651 and the second ring plate 652 is ensured by the folding rod group 653 and the adaptive telescopic rod 654. At the same time, when the first ring plate 651 and the second ring plate 652 adjust the spacing, the characteristics of stretching, folding, and extension and contraction are correspondingly realized, so that the guiding positioning spacing can be adaptively adjusted in different working scenarios, and the drill rod 500 has buffer adjustment when exiting the drilling hole 400, and the overall guiding performance is stable and reliable.

[0029] In order to better achieve guiding stability, the first ring plate 651 and the second ring plate 652 do not rotate in the borehole 400. During the process of the drill rod 500 going deeper, the first ring plate 651 and the second ring plate 652 are driven to rub and guide with the wall of the borehole 400 along a set angle. Specifically, the first ring plate 651 is rotatably connected to the initial section of the drill rod 600, and the first ring plate 651 is fixedly mounted on the initial section of the drill rod 600 through a double-row roller bearing 6511. A stable rotation connection relationship is achieved. The second ring plate 652 is slidably and rotatably connected to the initial section of the drill rod 600; combined Figure 5 As shown in , a mounting through hole is provided on the second ring plate 652, and a plurality of universal balls 6521 are arranged circumferentially on the inner wall of the mounting through hole. The first ring plate 651 is connected to the drill rod 500 in a sliding and rotatable manner. It can be seen that the first section drill rod 600 is fixedly connected to the double row roller bearing 6511 through a key, and the first ring plate 651 does not rotate with the drill rod 500 during its rotation. The plurality of universal balls 6521 arranged on the inner wall of the mounting through hole are in rolling contact with the first section drill rod 600, thereby ensuring stable rolling contact with the first section drill rod 600 and reducing wear without affecting the spacing adjustment between the first ring plate 651 and the second ring plate 652.

[0030] At the same time, in order to better handle the drilling 400 operation under different conditions, the second ring plate 652 is symmetrically equipped with a friction wheel group 656 in contact with the hole wall of the drilling hole 400 on one side facing away from the first ring plate 651; the friction wheel group 656 is connected to the second ring plate 652 through a hinge rod 655, and a plurality of springs 657 connected to the hinge rod 655 are arranged on the second ring plate 652. It has strong elasticity and elasticity, so that the friction wheel group 656 can contact the hole wall of the drilling hole 400 more comprehensively. The friction wheel group 656 is a wheel group of ratchet structure. It realizes unidirectional rotation, which is convenient for exiting the drilling hole 400. When the friction wheel group 656 moves in the first direction, the friction wheel group 656 stops and rubs against the hole wall of the drilling hole 400, and the folding rod group 653 is in an unfolded state; when the friction wheel group 656 moves in the second direction, the friction wheel group 656 rolls and contacts with the hole wall of the drilling hole 400, and the folding rod group 653 is in a folded state. It can be seen that when the drill rod 500 rotates and goes deeper, the friction wheel set 656 forms a stop friction relationship with the wall of the borehole 400, so that it has good guiding performance and reliable drilling accuracy. When the drill bit 620 exits the borehole 400, the friction wheel set 656 and the wall of the borehole 400 achieve rolling contact, and the spacing between the first ring plate 651 and the second ring plate 652 is adjusted to be smaller, reducing the resistance generated when exiting.

[0031] At the same time, in order to ensure the drilling accuracy of the deeper borehole 400 in the present application, a blowout preventer 300 is set at the orifice of the borehole 400. The blowout preventer 300 can not only protect the aquifer from gushing, but also achieve the effect of auxiliary positioning of the drill rod 500.

[0032] For reference Figure 6 The blowout prevention device 300 of the present application includes: a steel casing 320 inserted into the borehole 400. After the initial positioning of the drilling angle, a drill bit larger than the borehole 400 by 5mm to 15mm is installed through the drilling machine body 200 to pre-drill a borehole 400 with a depth of not less than 200cm. Then the steel casing 320 is inserted into the borehole 400, and the exposed end of the steel casing 320 is sealed and welded with a positioning plate 310, and the four corners of the positioning plate 310 are provided with anchor holes 311. By anchoring the positioning plate 310 on the drilling surface, a working hole 312 communicating with the interior of the steel casing 320 is provided on the positioning plate 310, and the steel casing 320 has the same inclination as the preset drilling angle. Then, the matching drilling bit 620 of the drilling 400 is replaced to start the drilling 400 operation.

[0033] During the continuous drilling process, the present application uses a hydraulically driven retractable fan-shaped plate 316 on the positioning plate 310 to position the drill rod 500, while increasing the working distance of the drilling machine body 200, facilitating operation while preventing damage to the drilling machine body 200 caused by weak collapse of the drill wall.

[0034] Combination Figure 7~Figure 9 As shown in Figure 7 Schematic diagram of the first embodiment of the blowout prevention device, schematic diagram of the initial working state of the positioning plate, the drill bit 620 enters the steel casing 320 through the working hole 312 to perform preliminary work. Figure 8 This is a schematic diagram of a second embodiment of the blowout prevention device, in which two opposite sector plates 316 clamp the drill rod 500 during its rotation to ensure high positioning accuracy. Fig. 9 This is a schematic diagram of a third embodiment of a blowout prevention device. After the drill bit 620 exposes the aquifer, water pressure exceeding a set threshold rushes to the orifice, and four fan-shaped plates 316 seal the working hole 312 in a mutually closed manner, thereby achieving a strong and rapid water-stopping performance.

[0035] Specifically, the interior of the positioning plate 310 is cross-intersected with hydraulic chambers 315, and the interior of each hydraulic chamber 315 is slidably connected to a fan-shaped plate 316 that can extend into the working hole 312; Fig.10 As shown in the figure, the fan-shaped plate 316 is connected to the corresponding hydraulic chamber 315 through the sliding plate 3161, and the end of each fan-shaped plate 316 is provided with an arc cavity 3163 adapted to the drill rod 500, and the inner part of the arc cavity 3163 is rotatably connected with a plurality of elastic balls 3164; the plurality of elastic balls 3164 are connected to the arc surface of the arc cavity 3163 through the pressure spring 3165, and have the characteristics of rotation and retreat and concealment. At the same time, a rubber layer 3162 or a tongue and groove is provided on both sides of each fan-shaped plate 316, so as to achieve the airtightness of the blocking working hole 312.

[0036] In order to reduce manual intervention in plugging the working hole 312, the hydraulic system 210 of the drilling machine body 200 is used in the present application to adjust the extension position of the fan plate 316; specifically, any two opposite hydraulic chambers 315 are connected to the same oil pipeline, and the two oil pipelines are respectively connected to the hydraulic system 210 of the drilling machine body 200; when the drilling machine body 200 drives the drill rod 500 to rotate and move, the hydraulic system 210 pumps oil to a corresponding oil pipeline, and the corresponding two The fan-shaped plates 316 are close to each other to press and position the drill rod 500, and the multiple elastic balls 3164 are in rolling contact with the outer wall of the drill rod 500; when the pressure information received by the drilling machine body 200 from the water pressure sensor 630 exceeds the set threshold, the hydraulic system 210 pumps oil to the two oil pipelines, the arc-shaped cavities 3163 of the four fan-shaped plates 316 embrace the drill rod 500, and the multiple elastic balls 3164 shrink to the inside of the corresponding arc-shaped cavities 3163, and the four fan-shaped plates 316 seal the working hole 312. The two oil pipelines are respectively: a first pipeline 3131 connecting two hydraulic chambers 315 opposite to each other, and a second pipeline 3141 connecting two hydraulic chambers 315 opposite to each other; wherein the first pipeline 3131 is connected to a first quick-connect valve 313 connected to the hydraulic system 210, and the second pipeline 3141 is connected to a second quick-connect valve 314 connected to the hydraulic system 210. It has the purpose of assisting positioning and quickly and conveniently blocking the working hole 312 to avoid accidents. The hydraulic system 210 connects the two pipelines through a quick-connect valve to achieve the purpose of separate control. According to the change of the angle during drilling, the corresponding two fan-shaped plates 316 are pre-extended to contact the drill rod 500, and the multiple elastic balls 3164 only have a rotational relationship with the drill rod 500 to reduce the friction coefficient; after the drill bit 620 exposes the aquifer, hydraulic oil is pumped into the first pipeline 3131 and the second pipeline 3141 at the same time until the four fan-shaped plates 316 are closed to each other, the multiple elastic balls 3164 are retracted into place, and the arc surface of the arc cavity 3163 fits the outer wall of the drill rod 500, achieving a quick and convenient seal with a significant water-stopping effect.

[0037] In the present application, after the drilling angle is determined by the drilling machine body 200, preliminary drilling is performed and then the blowout preventer 300 is installed; then the drill rod 500 is continuously lengthened to explore the waterproof layer. As the drill rod 500 continues to deepen, the directional drilling frame group 650 provides a stable drilling angle guarantee. During the rotation of the drill rod 500, a rotational connection relationship is formed with the first ring plate 651 and the second ring plate 652. The friction wheel group 656 forms a stopping friction during the movement along the borehole 400. The distance between the first ring plate 651 and the second ring plate 652 is lengthened to ensure the stability of the drilling angle. To ensure higher anti-bias performance; at the same time, when drilling a deeper borehole 400, the two fan-shaped plates 316 move closer to each other, so that the drill rod 500 is located at the center of the steel casing 320 for drilling, avoiding twisting; after the aquifer is found, the water pressure sensor 630 receives pressure information, the first ring plate 651 and the second ring plate 652 form a preliminary water barrier, and the hydraulic system 210 pumps oil to the four hydraulic chambers 315 to quickly seal the working hole 312, thereby achieving rapid water stopping and avoiding accidents. The overall drilling process is accurate, and the water stopping effect is efficient and convenient.

[0038] A person of ordinary skill in the art should understand that the discussion of any of the above embodiments is merely illustrative and is not intended to imply that the scope of the present disclosure (including the claims) is limited to these examples. In line with the concept of the present disclosure, the technical features in the above embodiments or different embodiments may be combined, the steps may be implemented in any order, and there are many other variations of different aspects of one or more embodiments of the present specification as above, which are not provided in detail for the sake of simplicity.

[0039] In addition, to simplify the description and discussion, and in order not to obscure one or more embodiments of the present specification, known power / ground connections to integrated circuits and other components may or may not be shown in the provided figures. In addition, devices may be shown in the form of block diagrams to avoid obscuring one or more embodiments of the present specification, and this also takes into account the fact that the details of the implementation of these block diagram devices are highly dependent on the platform on which one or more embodiments of the present specification will be implemented (i.e., these details should be fully within the scope of understanding of those skilled in the art). Where specific details are set forth to describe exemplary embodiments of the present disclosure, it is apparent to those skilled in the art that one or more embodiments of the present specification may be implemented without these specific details or with variations in these specific details. Therefore, these descriptions should be considered illustrative rather than restrictive.

[0040] One or more embodiments of this specification are intended to cover all such substitutions, modifications and variations that fall within the broad scope of the appended claims. Therefore, any omissions, modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of one or more embodiments of this specification should be included in the scope of protection of this disclosure.

[0041] The above are only specific implementations of the present application, but the protection scope of the present application is not limited thereto. Any technician familiar with the technical field can easily think of changes or substitutions within the technical scope disclosed in the present application, which should be included in the protection scope of the present application. Therefore, the protection scope of the present application should be based on the protection scope of the claims.

Claims

1. A drilling device for coal mine construction, comprising a drilling device for drilling holes in tunnels to explore aquifers, and a blowout prevention device mounted at the orifice of the borehole; characterized in that: The drilling equipment comprises: a drilling machine body, a multi-section drill rod mounted on the drilling machine body, and a drill bit connected to the initial section drill rod; a mounting sleeve is mounted on the initial section drill rod, a water pressure sensor is mounted inside the mounting sleeve, and a wireless signal transmitter for transmitting the water pressure information of the aquifer detected by the water pressure sensor to the drilling machine body; The primary drill rod is also equipped with a directional drilling frame group; the directional drilling frame group includes: a first ring plate and a second ring plate; a plurality of folding rod groups are connected between the first ring plate and the second ring plate, the first ring plate is rotatably connected to the primary drill rod, and the second ring plate is slidably and rotatably connected to the primary drill rod; a friction wheel group in contact with the wall of the drill hole is symmetrically equipped on a side of the second ring plate facing away from the first ring plate; when the friction wheel group moves along the first direction, the friction wheel group and the wall of the drill hole are stopped and rubbed, and the folding rod group is in an unfolded state; when the friction wheel group moves along the second direction, the friction wheel group and the wall of the drill hole are rollingly contacted, and the folding rod group is in a folded state; The blowout prevention device comprises: a steel casing inserted into the borehole, and a positioning plate connected to the exposed end of the steel casing; the positioning plate is provided with a working hole connected to the interior of the steel casing, and the interior of the positioning plate is cross-intersected with hydraulic chambers, and the interior of each hydraulic chamber is slidably connected with a fan-shaped plate that can extend to the working hole; the end of each fan-shaped plate is provided with an arc cavity adapted to the drill rod, and the interior of the arc cavity is rotatably connected with a plurality of elastic balls; wherein, Any two opposite hydraulic chambers are connected to the same oil pipeline, and the two oil pipelines are respectively connected to the hydraulic system of the drilling machine body; When the drilling machine body drives the drill rod to rotate and move, the hydraulic system pumps oil to a corresponding oil pipeline, and the corresponding two fan-shaped plates approach each other to press and position the drill rod, and a plurality of elastic balls roll in contact with the outer wall of the drill rod; when the pressure information of the water pressure sensor received by the drilling machine body exceeds a set threshold, the hydraulic system pumps oil to the two oil pipelines, the arc-shaped cavities of the four fan-shaped plates embrace the drill rod, the plurality of elastic balls shrink to the inside of the corresponding arc-shaped cavities, and the four fan-shaped plates seal the working hole positions.

2. The drilling device for coal mine construction according to claim 1, characterized in that: The first ring plate and the second ring plate are both orifice plates with water-permeable holes.

3. The drilling device for coal mine construction according to claim 1, characterized in that: The first ring plate is fixedly sleeved on the primary drill pipe via a double-row roller bearing.

4. The drilling device for coal mine construction according to claim 3, characterized in that: The second ring plate is provided with a mounting through hole, and a plurality of universal balls are circumferentially arranged on the inner wall of the mounting through hole.

5. The drilling device for coal mine construction according to claim 4, characterized in that: The folding rod group includes: a first connecting rod rotatably connected to the first ring plate, and a second connecting rod rotatably connected to the second ring plate; wherein the first connecting rod and the second connecting rod are connected by a rotating shaft at one end facing each other.

6. The drilling device for coal mine construction according to claim 5, characterized in that: A plurality of adaptive telescopic rods are connected between the first ring plate and the second ring plate.

7. The drilling device for coal mine construction according to claim 1, characterized in that: The friction wheel sets are all connected to the second ring plate via hinged rods, and the second ring plate is provided with a plurality of springs connected to the hinged rods.

8. The drilling device for coal mine construction according to claim 7, characterized in that: The friction wheel set is a wheel set with a ratchet structure.

9. The drilling device for coal mine construction according to claim 1, characterized in that: The positioning plate is provided with a plurality of anchor holes.

10. The drilling device for coal mine construction according to claim 9, characterized in that: The two oil delivery pipelines are: a first pipeline connecting two hydraulic chambers opposite to each other, and a second pipeline connecting two hydraulic chambers opposite to each other; wherein, The first pipeline is connected with a first quick-connect valve connected with the hydraulic system, and the second pipeline is connected with a second quick-connect valve connected with the hydraulic system.

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