Coal seam drilling and bending drilling equipment and working method thereof

Abstract

The invention provides coal seam drilling bending drilling equipment and a working method thereof. A drilling assembly drives a drill bit to drill in a coal seam through water as power to form an extraction hole; the positioning mechanisms are provided with fixing rods stretching out and drawing back in the axial direction of the positioning mechanisms, and the two positioning mechanisms are hinged through a plurality of pushing rods so that the drilling assembly can be pushed through stretching out and drawing back of the pushing rods. The multiple pushing rods enable the positioning mechanisms of the corresponding drilling assemblies to incline through pushing at different speeds so as to drive the drill bits to steer to achieve bent drilling. The device can turn in the drilling process, extraction holes are drilled from roadways on the two sides of a working face and gradually bend to penetrate out perpendicular to the working face, in this way, the number of drilled holes is small, the efficient extraction time of each extraction hole is greatly shortened, and the overall efficiency is greatly improved compared with an existing method; the method also has great significance for improving the production efficiency of the coal mine and the underground safety.

Description

Technical Field

[0001] The invention belongs to the technical field of coal seam drilling, and in particular relates to a coal seam drilling curved drilling device and a working method thereof. Background Art

[0002] During coal mining operations, for underground safety, the gas content must be reduced to within the required range for coal mining when mining coal seams containing gas. This has led to the continuous development and advancement of coal seam gas extraction technology and related equipment. Currently, curved drilling methods exist for gas extraction and pressure relief holes, relying on the bend of the drill rod itself. This results in a large turning radius due to the inherent properties of the drill rod, resulting in inadequate gas extraction and pressure relief within the coal seam at the working face. Straight hole drilling, when the working face advances a long distance, results in a large number of gas extraction holes being drilled, and a short effective extraction time for each extraction hole, resulting in low overall efficiency.

[0003] Therefore, it is necessary to provide an improved technical solution to the above-mentioned deficiencies in the prior art. Summary of the Invention

[0004] The purpose of the present invention is to overcome the above-mentioned deficiencies in the prior art. The present invention provides a coal seam drilling curved drilling device and a working method thereof.

[0005] In order to achieve the above object, the present invention provides the following technical solutions:

[0006] A coal seam drilling curved drilling device, comprising:

[0007] A drilling assembly, wherein the drilling assembly uses water as a power source to drive a drill bit to drill into the coal seam to form an extraction hole;

[0008] A positioning mechanism, wherein the positioning mechanism is provided with a fixing rod that is retractable along its axial direction, so as to fix the positioning mechanism to the inner wall of the extraction hole as the fixing rod is extended;

[0009] The two positioning mechanisms are hinged by a plurality of propulsion rods, and the two positioning mechanisms are alternately fixed to the inner wall of the extraction hole so as to propel the drilling assembly by extending and retracting the propulsion rods;

[0010] One of the positioning mechanisms is concentrically assembled with the drilling assembly, and a plurality of the propulsion rods are evenly distributed around the circumference of the positioning mechanism;

[0011] The plurality of propulsion rods are propelled at different speeds to cause the positioning mechanism of the corresponding drilling assembly to tilt, thereby driving the drill bit to turn and realize curved drilling.

[0012] Preferably, the drilling assembly is a hydraulic motor, the propulsion rod and the fixed rod are hydraulic cylinders, and the water supply main of the liquid supply pump is connected to the hydraulic motor and the auxiliary diverter valve through a main diverter valve;

[0013] The auxiliary diverter valve is correspondingly connected to the propulsion rod and the fixing rod.

[0014] Preferably, a first control valve is provided between the hydraulic motor and the main diverter valve;

[0015] The plurality of propulsion rods are respectively connected to the auxiliary diverter valve via independent second control valves;

[0016] The plurality of fixing rods on the same positioning mechanism are connected to the auxiliary diverter valve via the same third control valve.

[0017] Preferably, the positioning mechanism includes a main body and a support ring, the fixing rods are evenly distributed on the periphery of the main body, the support ring is fixedly connected to the outside of the main body through a truss, and the support ring is provided with a through hole corresponding to the piston end of the fixing rod.

[0018] Preferably, there are three fixing rods on the same positioning mechanism, and the piston ends of the fixing rods are provided with sharp ends.

[0019] Preferably, both ends of the propulsion rod are connected to the two positioning mechanisms via ball joints.

[0020] Preferably, a displacement sensor corresponding to the piston end of the propulsion rod is provided inside the propulsion rod.

[0021] A method for operating a coal seam drilling curved drilling device, wherein the method comprises the following steps:

[0022] Step S1, designing the location and direction of extraction holes at the working face according to the coal seam structure, connecting the drilling equipment to the water supply for power, and setting the maximum extension of different propulsion rods;

[0023] Step S2, drilling the extraction hole by supplying water to the drilling equipment, wherein the two positioning mechanisms are alternately fixed to the inner wall of the extraction hole so as to propel the drilling assembly by extending and retracting the propulsion rod;

[0024] Step S3, when drilling reaches a specified depth, controlling the multiple propulsion rods to advance at different speeds, causing the corresponding drilling assembly to tilt, so that the extraction hole turns smoothly and becomes perpendicular to the working surface;

[0025] Step S4: the extraction hole passes through the working face along the set trajectory;

[0026] Step S5: After dismantling the drilling equipment, gas extraction is performed, and after the extraction is completed, the extraction hole is sealed.

[0027] Preferably, the drilling assembly is a hydraulic motor, the propulsion rod and the fixed rod are both hydraulic cylinders, the water supply main of the liquid supply pump is connected to the hydraulic motor and the auxiliary diverter valve through a main diverter valve; the auxiliary diverter valve is correspondingly connected to the propulsion rod and the fixed rod;

[0028] After drilling is completed, remove the water supply main and main diverter valve.

[0029] Preferably, after the positioning mechanism enters the extraction hole, the front positioning mechanism is fixed to the inner wall of the extraction hole, and the propulsion rod is retracted to cause the rear positioning mechanism to move forward;

[0030] The rear positioning mechanism is fixed to the inner wall of the extraction hole, and the push rod is extended to move the front positioning mechanism forward;

[0031] The two positioning mechanisms cycle the above steps to advance the drilling assembly.

[0032] Beneficial effects: This device can turn during the drilling process, so that the extraction holes are drilled from the tunnels on both sides of the working face and gradually bend and extend perpendicular to the working face and pass through. This arrangement not only reduces the number of drilled holes, but also greatly increases the time for efficient extraction of each extraction hole. The overall efficiency is greatly improved compared to the current method, which is also of great significance to the improvement of coal mine production efficiency and underground safety. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] The drawings and the accompanying drawings, which constitute part of this application, are intended to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are intended to explain the present invention and do not constitute an undue limitation of the present invention. Among them:

[0034] Figure 1 A simplified structural diagram of a drilling device in a specific embodiment of the present invention;

[0035] Figure 2 This is a drilling diagram of the drilling equipment in the specific embodiment provided by the present invention.

[0036] In the figure: 1. Hydraulic motor; 2. Drill bit; 3. Support ring; 4. Main body; 5. Fixed rod; 6. Push rod; 7. Water supply main; 8. Working face; 9. Extraction hole; 10. Main diverter valve; 11. Auxiliary diverter valve; 12. Water barrier bag; 13. Tunnel. DETAILED DESCRIPTION

[0037] The technical solutions in the embodiments of the present invention are described clearly and completely below. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention are within the scope of protection of the present invention.

[0038] In the description of the present invention, the terms "longitudinal", "transverse", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the present invention and do not require that the present invention must be constructed and operated in a specific orientation. Therefore, they should not be understood as limitations on the present invention. The terms "connected" and "connected" used in the present invention should be understood in a broad sense. For example, it can be a fixed connection or a detachable connection; it can be a direct connection or an indirect connection through an intermediate component. For ordinary technicians in this field, the specific meanings of the above terms can be understood according to the specific circumstances.

[0039] The present invention will be described in detail below with reference to the accompanying drawings and in combination with embodiments. It should be noted that, in the absence of conflict, the embodiments and features of the embodiments of the present invention can be combined with each other.

[0040] like Figure 1-2 As shown, a coal seam drilling curved drilling equipment can make the extraction hole 9 drilled from the tunnels on both sides of the coal seam working face 8, and gradually bend and extend perpendicular to the working face 8, and then pass through the working face 8. This arrangement not only reduces the number of drilled holes, but also greatly improves the time for efficient extraction of each extraction hole 9. Specifically, it includes a drilling component and a positioning mechanism. The drilling component is powered by water, and can drive the drill bit 2 to drill into the coal seam to form an extraction hole 9 through water. During the drilling process, the electric sparks generated by electrical contact are reduced, thereby avoiding the problem of gas explosion during the drilling process to the greatest extent.

[0041] A positioning mechanism is provided on the drilling assembly, and a fixing rod 5 that is retractable along its axial direction is provided on the positioning mechanism. As the fixing rod 5 is extended, the end of the fixing rod 5 radially squeezes the inner wall of the extraction hole 9, so that the positioning mechanism can be fixed inside the extraction hole 9, and then serve as a load-bearing component to provide reverse thrust to the drilling assembly.

[0042] The two positioning mechanisms are hinged through multiple propulsion rods 6, so that the distance between the two positioning mechanisms can be changed under the extension and contraction of the propulsion rods 6. In actual use, the two positioning mechanisms are alternately fixed on the inner wall of the extraction hole 9, and the propulsion rods 6 cooperate to extend and contract during the alternating process, so that the drilling assembly is advanced by the extension and contraction of the propulsion rods 6.

[0043] In this device, one of the (front) positioning mechanisms is concentrically assembled with the drilling assembly, and the two are fixed to each other so that they can be distributed in the same direction. Multiple push rods 6 are evenly distributed circumferentially on the positioning mechanism. Specifically, when the rear positioning mechanism is fixed and the front positioning mechanism is in contact and fixed state, the rear positioning mechanism is used as a force-bearing device to push the front positioning mechanism and the drilling assembly forward. In the process of the push rod 6 pushing the drilling assembly forward, the multiple push rods 6 are controlled to advance at different speeds, so that the positioning mechanism of the corresponding drilling assembly can be tilted to drive the drill bit 2 to turn and achieve curved drilling.

[0044] In this embodiment, three push rods 6 are provided, and the two ends of the push rods 6 are connected to two positioning mechanisms through ball joints, so that the two positioning mechanisms have a large degree of freedom of tilt. During the pushing process, when drilling to any one of the push rods 6 reaches the maximum extension, the front positioning mechanism is fixed in the extraction hole 9 to fix the drilling assembly, and the rear positioning mechanism releases the fixation of the extraction hole 9. The three push rods 6 are depressurized and contracted, driving the rear positioning mechanism to move forward. When any one of the push rods 6 reaches the minimum extension, the rear positioning mechanism fixes the extraction hole 9, and the front positioning mechanism is unlocked. The above operation is repeated to realize drilling. During the drilling process, the extension speed of the push rod 6 is controlled according to the designed shape of the extraction hole 9 to adapt to different curved paths of the extraction hole 9.

[0045] In an optional embodiment, the drilling assembly is a hydraulic motor 1, and the main shaft of the hydraulic motor 1 is connected to the drill bit 2, which is an actuator of the hydraulic system. It converts the liquid pressure energy provided by the hydraulic pump into the mechanical energy (torque and speed) of its output shaft. In this application, water is used as a medium for transmitting force and motion. The propulsion rod 6 and the fixed rod 5 are both hydraulic cylinders. Accordingly, the extension and contraction of the hydraulic cylinder are controlled by water as a medium. In this application, water is supplied to the drilling equipment through a liquid supply pump. The water supply main pipe 7 of the liquid supply pump is connected to the liquid inlet end and the auxiliary diverter valve 11 of the hydraulic motor 1 through the main diverter valve 10. The water supply main pipe 7 is a pressure-resistant hose. In this application, the liquid outlet end of the hydraulic motor 1 is not provided with a water outlet pipe, so that the drilling surface can be cooled during the drilling process.

[0046] The auxiliary diverter valve 11 is independently connected to the corresponding propulsion rod 6 and fixed rod 5 through the auxiliary water supply pipe, and a first control valve is provided between the hydraulic motor 1 and the main diverter valve 10; multiple propulsion rods 6 are connected to the auxiliary diverter valve 11 through independent second control valves, so that the propulsion rod 6 can be independently controlled according to actual needs to meet drilling requirements; multiple fixed rods 5 on the same positioning mechanism are connected to the auxiliary diverter valve 11 through the same third control valve, so that the multiple fixed rods 5 on the same positioning mechanism can be synchronously extended and retracted, thereby ensuring the concentricity of the positioning mechanism and the extraction hole 9.

[0047] The first control valve, the second control valve and the third control valve are all electric control valves, which can control the output water pressure, flow and direction. The above electric control valves are all existing hydraulic components, and their specific structures and connection relationships are not limited here. Those skilled in the art can select the model and connection method according to actual needs.

[0048] In an optional embodiment, the positioning mechanism includes a main body 4 and a support ring 3. The outer diameter of the support ring 3 is adapted to the inner diameter of the extraction hole 9. Fixed rods 5 are evenly distributed on the outer periphery of the main body 4. The support ring 3 is fixedly connected to the outside of the main body 4 by a truss. The support ring 3 is provided with a through-hole corresponding to the piston end of the fixed rod 5. The support ring 3 can not only support the inner wall of the extraction hole 9, but also fix the fixed rod 5 to ensure the stability of the fixed rod 5. There are three fixed rods 5 on the same positioning mechanism. The piston end of the fixed rod 5 is provided with a sharp end. The sharp end is inserted into the inner wall of the extraction hole 9 to ensure the stability of the fixation. A displacement sensor corresponding to the piston end of the propulsion rod 6 is provided inside. The displacement sensor monitors the extension and retraction of the hydraulic rod in real time, and then controls the three hydraulic rods to propel at different speeds, thereby causing the hydraulic motor 1 and the drill bit 2 and other devices to deviate from a certain angle for drilling.

[0049] In this embodiment, a scale line is provided on the main water supply pipe, so that the drilling depth of the extraction hole 9 can be measured, and the offset direction of the drilling assembly can be controlled according to the drilling depth of the extraction hole 9.

[0050] In an optional embodiment, a water-proof bag 12 is provided between the support rings 3 of the two positioning mechanisms. The water-proof bag 12 is a cylindrical rubber sleeve, which can expand and contract as the distance between the two positioning mechanisms changes, and prevent gravel from the hole wall from entering between the two positioning mechanisms.

[0051] The main body 4 is provided with a perforation or a hollow structure for the water supply pipes to pass through, and the main diverter valve 10 and the auxiliary diverter valve 11 are located behind the rear positioning mechanism to facilitate disassembly and installation.

[0052] In an optional embodiment, the present application further provides a working method of a coal seam drilling curved drilling device based on the above-mentioned drilling device, so as to drill a gas extraction hole 9 in a coal seam, comprising the following steps:

[0053] Step S1, design the position and direction of the extraction hole 9 at the working face 8 according to the coal seam structure, connect the drilling equipment with the water used to provide power, specifically, connect each control valve and the main and auxiliary water supply pipes to drive the drilling assembly, independently control each thrust rod 6, and synchronously control the fixed rod 5 on the same positioning mechanism.

[0054] In this embodiment, the extraction holes 9 are designed to be drilled from the tunnels on both sides of the working face 8 and gradually bend perpendicular to the working face 8, and pass through the working face 8 after reaching the preset position. This arrangement not only reduces the number of holes drilled, but also greatly improves the time for efficient extraction of each extraction hole 9. The overall efficiency is greatly improved compared to the current method, which is also of great significance to the improvement of coal mine production efficiency and underground safety.

[0055] Step S2: supplying water to the drilling equipment through a hydraulic pump to achieve drilling of the extraction hole 9; the two positioning mechanisms are alternately fixed to the inner wall of the extraction hole 9 to propel the drilling assembly through the extension and contraction of the propulsion rod 6;

[0056] Specifically, after the positioning mechanism enters the extraction hole 9, the front positioning mechanism is fixed on the inner wall of the extraction hole 9, and the propulsion rod 6 contracts to cause the rear positioning mechanism to move forward; the rear positioning mechanism is fixed on the inner wall of the extraction hole 9, and the propulsion rod 6 extends to cause the front positioning mechanism to move forward; the two positioning mechanisms cycle the above steps to realize the advancement of the drilling assembly.

[0057] Step S3, when drilling to the specified depth, the extraction hole 9 needs to be turned. The second control valve controls multiple propulsion rods 6 to advance at different speeds, causing the corresponding drilling components to tilt, so that the extraction hole 9 is perpendicular to the working surface 8 after a smooth transition.

[0058] Step S4: the extraction hole 9 is drilled along the set trajectory to the set position, and the drill bit 2 is pushed out of the coal seam from the working face by the multiple thrust rods 6 at the same speed;

[0059] Step S5: After the drilling equipment is dismantled, gas extraction is performed, and after the extraction is completed, the extraction hole 9 is sealed.

[0060] In an optional embodiment, the drilling assembly is a hydraulic motor 1, the thrust rod 6 and the fixed rod 5 are both hydraulic cylinders, and the water supply main 7 of the liquid supply pump is connected to the hydraulic motor 1 and the auxiliary diverter valve 11 through the main diverter valve 10; the auxiliary diverter valve 11 is correspondingly connected to the thrust rod 6 and the fixed rod 5. This application connects the water pipe through the control valve to meet the needs of driving the drilling assembly, independently controlling each thrust rod 6, and synchronously controlling the fixed rod 5 on the same positioning mechanism.

[0061] After drilling is completed, the water supply main 7 and the main diverter valve 10 are removed. The coal wall in the extraction area is relatively broken and the water supply pipe is difficult to pull out. Therefore, the water supply main 7 is retained in the extraction hole 9 to avoid damage to the wall of the extraction hole 9 caused by pulling the water supply main 7.

[0062] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention are within the scope of protection of the pending claims of the present invention.

Claims

1. A coal seam drilling curved drilling equipment, characterized in that: include: A drilling assembly, wherein the drilling assembly uses water as a power source to drive a drill bit to drill into the coal seam to form an extraction hole; A positioning mechanism, wherein the positioning mechanism is provided with a fixing rod that is retractable along its axial direction, so as to fix the positioning mechanism to the inner wall of the extraction hole as the fixing rod is extended; The two positioning mechanisms are hinged by a plurality of propulsion rods, and the two positioning mechanisms are alternately fixed to the inner wall of the extraction hole so as to propel the drilling assembly by extending and retracting the propulsion rods; One of the positioning mechanisms is concentrically assembled with the drilling assembly, and a plurality of the propulsion rods are evenly distributed around the circumference of the positioning mechanism; The plurality of propulsion rods are propelled at different speeds to cause the positioning mechanism of the corresponding drilling assembly to tilt, thereby driving the drill bit to turn and realize curved drilling.

2. The coal seam drilling curved drilling equipment according to claim 1, characterized in that: The drilling assembly is a hydraulic motor, the propulsion rod and the fixed rod are hydraulic cylinders, and the water supply main of the liquid supply pump is connected to the hydraulic motor and the auxiliary diverter valve through the main diverter valve; The auxiliary diverter valve is correspondingly connected to the propulsion rod and the fixing rod.

3. The coal seam drilling curved drilling equipment according to claim 2, characterized in that: A first control valve is provided between the hydraulic motor and the main diverter valve; The plurality of propulsion rods are respectively connected to the auxiliary diverter valve via independent second control valves; The plurality of fixing rods on the same positioning mechanism are connected to the auxiliary diverter valve via the same third control valve.

4. The coal seam drilling curved drilling equipment according to claim 1, characterized in that: The positioning mechanism includes a main body and a support ring. The fixing rods are evenly distributed on the periphery of the main body. The support ring is fixedly connected to the outside of the main body through a truss. The support ring is provided with a through hole corresponding to the piston end of the fixing rod.

5. The coal seam drilling curved drilling equipment according to claim 4, characterized in that: There are three fixing rods on the same positioning mechanism, and the piston ends of the fixing rods are provided with sharp ends.

6. The coal seam drilling curved drilling equipment according to claim 1, characterized in that: The two ends of the propulsion rod are respectively connected to the two positioning mechanisms through ball joints.

7. The coal seam drilling curved drilling equipment according to claim 1, characterized in that: A displacement sensor corresponding to the piston end of the propulsion rod is provided inside the propulsion rod.

8. A method for operating a curved drilling device for drilling a coal seam, wherein the method comprises: The following steps are involved: Step S1: Design the location and direction of the extraction hole at the working face according to the coal seam structure, connect the drilling equipment to the water supply for power, and set the maximum extension of different propulsion rods; Step S2, drilling the extraction hole by supplying water to the drilling equipment, wherein the two positioning mechanisms are alternately fixed to the inner wall of the extraction hole so as to propel the drilling assembly by extending and retracting the propulsion rod; Step S3, when drilling reaches a specified depth, controlling the multiple propulsion rods to advance at different speeds, causing the corresponding drilling assembly to tilt, so that the extraction hole turns smoothly and becomes perpendicular to the working surface; Step S4: the extraction hole passes through the working surface along the set trajectory; Step S5: After dismantling the drilling equipment, gas extraction is performed, and after the extraction is completed, the extraction hole is sealed.

9. The working method of the coal seam drilling curved drilling equipment according to claim 8, characterized in that: The drilling assembly is a hydraulic motor, the propulsion rod and the fixed rod are hydraulic cylinders, and the water supply main of the liquid supply pump is connected to the hydraulic motor and the auxiliary diverter valve through the main diverter valve; the auxiliary diverter valve is correspondingly connected to the propulsion rod and the fixed rod; After drilling is completed, remove the water supply main and main diverter valve.

10. The working method of the coal seam drilling curved drilling equipment according to claim 8, characterized in that: After the positioning mechanism enters the extraction hole, the front positioning mechanism is fixed to the inner wall of the extraction hole, and the push rod is retracted to cause the rear positioning mechanism to move forward; The rear positioning mechanism is fixed to the inner wall of the extraction hole, and the push rod is extended to move the front positioning mechanism forward; The two positioning mechanisms cycle the above steps to advance the drilling assembly.

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