Device and method for continuously and rapidly dredging soft coal seam gas extraction drill hole collapse

Abstract

The invention provides a device and method for continuously and rapidly dredging soft coal seam gas extraction drill hole collapse, and belongs to the technical field of coal seam gas extraction. The device comprises a continuous steel pipe winding mechanism, a continuous steel pipe propelling or retreating power mechanism and an aerodynamic drilling mechanism, and compressed air in a mine compressed air system is adopted as a medium for treating collapsed holes and serves as driving power of a cutting drill bit in the aerodynamic drilling mechanism to repair gas extraction collapsed drill holes in the soft coal seam. And the power mechanism is used for providing power for the continuous steel pipe winding mechanism, the continuous steel pipe propelling or retreating power mechanism and the aerodynamic drilling mechanism. The air power drilling mechanism is adopted for repairing the soft coal seam gas extraction collapse drill hole, the water locking effect can be effectively avoided, the equipment size is reduced, the device is suitable for coal mine underground limited space operation, the coal seam gas extraction rate and utilization rate are increased, and the dual purposes of coal mine safety production and efficient energy utilization are achieved.

Description

Technical Field

[0001] The invention relates to the technical field of coal seam gas mining, and in particular to a device for continuously and quickly clearing the collapse of a gas extraction borehole in a soft coal seam and a method for using the device. Background Art

[0002] Gas is the "number one killer" of coal mine safety production. People have an inherent impression that there is a risk of disasters when there is gas. Soft and low-permeability coal seams are hotbeds for gas disasters, accounting for a large proportion of mineable coal seams in my country. Coal seam drilling is the main way to extract gas and reduce gas disasters. However, in the process of drilling for gas extraction in such coal seams, drill clamping and top drilling are prone to occur, and hole collapse and blockage are prone to occur after the drill is withdrawn. The problems of drill clamping and top drilling during drilling have been basically solved by the foam composite drilling process. In order to solve the problem of hole collapse and blockage after the drill is withdrawn, the main technologies currently used are screen protection, re-drilling with a drilling rig, and hydraulic punching. However, the screen has a small diameter and low strength and is easily collapsed, affecting the extraction effect; the drilling rig re-drilling efficiency is low, especially the disassembly of the drill rod affects the drilling efficiency, and the pressure in the hole changes greatly during the loading and unloading of the drill rod and the intermittent water supply and slag removal, which affects the stability of the borehole wall and aggravates the collapse of the borehole to a certain extent. High-pressure water is used to clean the collapsed coal slag in the hole at a fast speed. However, for soft coal seams, high-pressure hydraulic cutting of the entire borehole wall will cause a larger area of ​​collapse in the borehole after cleaning, reducing the gas extraction effect.

[0003] At present, the treatment technology and methods for the collapse of coal seam gas extraction boreholes are mainly covered by the following three patents. For example, the Chinese patent with application number CN201210489910.1 and invention name "A comprehensive method for drilling, permeability enhancement, repair and gas drive replacement of underground coal mine boreholes" uses a flexible steel pipe to inject high-pressure water through a nozzle jet to cut the coal at the collapsed part of the borehole, but the invention is less effective in near-horizontal boreholes, soft coal seams, and low water pressure. At the same time, if the water pressure is high, it will cause further damage to the coal wall and easily cause a larger range of collapse. For example, the Chinese patent with application number 201410827235.8 and invention name "A method for repairing underground coal seam gas extraction boreholes and a device for its use" uses a rear reverse nozzle and a front forward nozzle high-pressure pipe to form a jet to provide power for drill bit rotation, hole expansion, slag cleaning and slag removal, but the invention is limited in use in severely collapsed boreholes in soft coal seams and the repair borehole trajectory is uncontrollable. For example, the Chinese patent with application number 201510579809.9 and invention name “Bore-washing method for gas extraction boreholes in coal mines” uses the rock-breaking ability of self-propelled water jets to break and wash blocked and collapsed parts. However, the limitation is that after the drill rod is replaced with a hose and a resin tube, the effective length of the borehole wash is reduced and the trajectory of the drill bit is uncontrollable. The medium for treating collapsed holes in the above three patents is water, which can aggravate the water lock effect of gas and affect the gas extraction effect. Summary of the invention

[0004] In view of this, in order to solve the shortcomings of the existing repair of collapsed boreholes for gas extraction in soft coal seams, on the one hand, the present invention provides a device for continuously and quickly clearing collapsed boreholes for gas extraction in soft coal seams, which repairs collapsed boreholes for gas extraction in soft coal seams by using compressed air in the mine compressed air system as a medium for treating collapsed holes and as a driving force for the cutting drill bit in the pneumatic drilling mechanism, and can effectively avoid the water lock effect while reducing the size of the equipment. It is suitable for limited space operations in underground coal mines, improves the extraction rate and utilization rate of coal seam gas, and achieves the dual goals of safe production in coal mines and efficient energy utilization.

[0005] To achieve the above object, the present invention provides the following technical solutions: A device for continuously and quickly clearing the collapse of a borehole in a soft coal seam gas extraction process, comprising: Continuous steel pipe winding mechanism, used for winding or releasing the continuous steel pipe; A continuous steel pipe advancing or retreating power mechanism, used to perform straightening, advancing and retreating work of the continuous steel pipe; The pneumatic drilling mechanism uses compressed air in the mine compressed air system as a medium for treating collapsed holes and as a driving force for the cutting drill bit in the pneumatic drilling mechanism to repair collapsed holes in gas extraction in soft coal seams; The power mechanism is used to provide power for the continuous steel pipe winding mechanism, the continuous steel pipe advancing or retreating power mechanism and the pneumatic drilling mechanism.

[0006] Preferably, it also includes: The frame walking mechanism is used to provide moving power for the continuous steel pipe winding mechanism, the continuous steel pipe advancing or retreating power mechanism and the pneumatic drilling mechanism.

[0007] Preferably, the continuous steel pipe winding mechanism comprises: A roller bracket is arranged on the frame; The winding drum is rotatably connected to the drum support and is used for winding or releasing the continuous steel pipe.

[0008] Preferably, the continuous steel pipe advancing or retreating power mechanism comprises: The sliding track is arranged on the frame, and the front and rear parts of the sliding track are respectively provided with a front telescopic oil cylinder and a rear telescopic oil cylinder; The front steel pipe clamp and the rear steel pipe clamp are respectively connected to the output ends of the front telescopic oil cylinder and the rear telescopic oil cylinder, and are both slidably connected to the sliding track; A front position sensor, which is arranged on the sliding track and located between the front steel pipe clamp and the rear steel pipe clamp; The rear position sensor is arranged on the sliding track and is located at the rear of the rear steel pipe clamp.

[0009] Preferably, it also includes: The front lifting oil cylinder and the rear lifting oil cylinder are both arranged on the frame, and the output ends are respectively connected to the front and rear of the sliding track.

[0010] Preferably, the slips in the front steel pipe clamp and / or the rear steel pipe clamp are rubber slips.

[0011] Preferably, the pneumatic drilling mechanism comprises: A pneumatic screw motor, one end of which is connected to the continuous steel pipe, and the other end of which is connected to the cutting drill bit, drives the cutting drill bit to rotate through the medium and low pressure air of the mine pressure air system.

[0012] Preferably, it also includes: The centralizer is connected between the continuous steel pipe and the pneumatic screw motor to ensure that the entire drilling and dredging process is carried out along the original drilling trajectory.

[0013] Preferably, the pneumatic drilling mechanism ensures that the pressure is not less than 0.5 MPa.

[0014] On the other hand, the present invention also provides a method for using the above-mentioned device for continuously and quickly clearing the collapse of a gas extraction borehole in a soft coal seam, comprising the following steps: S1. Align the device with the borehole to be dredged, and adjust the height and inclination of the continuous steel pipe advancing or retreating power mechanism to be consistent with the opening height and inclination of the borehole; S2. Start the continuous steel pipe winding mechanism and the continuous steel pipe advancing or retreating power mechanism to operate together, advance the air power drilling mechanism to the borehole, and install the gas extraction, coal dust capture and coal slag cleaning devices connected to the borehole; S3, connect the mine compressed air system to the continuous steel pipe inlet, control the speed of the pneumatic screw motor and thus control the coal breaking strength of the cutting drill bit; S4. The coal slag in the borehole is discharged in two ways: one is to discharge the coal slag in the front of the borehole by compressed air; the other is to discharge the deep and large coal slag by combining the high-speed rotation of the cutting drill bit and compressed air when withdrawing the drill; S5. Repeat operations S1 to S4 to complete the dredging operations of all collapsed boreholes in sequence.

[0015] The device for continuously and quickly clearing the collapsed boreholes in gas extraction in soft coal seams provided by the present invention uses the compressed air in the mine compressed air system as the medium for treating the collapsed boreholes and as the driving power for the cutting drill bit in the pneumatic drilling mechanism to repair the collapsed boreholes in gas extraction in soft coal seams. Compared with the prior art, it has the following beneficial effects: (1) The present invention can effectively avoid the water lock effect and reduce the size of the equipment. It is suitable for limited space operations in coal mines, improves the extraction rate and utilization rate of coal seam gas, and achieves the dual goals of safe production in coal mines and efficient utilization of energy.

[0016] (2) The present invention adopts a dual drive of a continuous steel pipe winding mechanism and a continuous steel pipe advancing or retreating power mechanism to synchronously drive the continuous steel pipe, thereby alleviating the problem of longitudinal bending of the continuous steel pipe and making the continuous steel pipe advancing power more uniform.

[0017] (3) The present invention adopts a telescopic oil cylinder and a clamp with rubber slips inside as the driving mechanism of the continuous steel pipe. The power output is relatively stable and linear, and the damage to the continuous steel pipe is relatively small.

[0018] (4) After the present invention uses a continuous steel pipe to replace the traditional drilling, the entire drilling and retracting process does not require the loading and unloading of the drill rod, which reduces labor intensity and improves the efficiency of drilling and clearing blockages.

[0019] (5) The present invention directly uses the mine compressed air system to drive the pneumatic drilling mechanism. The overall equipment has a simple structure and a small size, which is more suitable for limited space operations underground. At the same time, compared with the water power drive, it avoids the water lock effect of gas and can improve the gas extraction rate. Compared with the traditional water jet drilling mechanism, the pneumatic drilling mechanism consists of a drilling system composed of a centralizer, a pneumatic screw motor and a cutting drill bit, which has a more reliable trajectory and better slag removal effect than the drilling system composed of a guide controller and a jet drill bit.

[0020] (6) Compared with the existing drilling hole flushing and clearing equipment, the present invention is more suitable for clearing blockages in high-stress soft coal seams, and is particularly suitable for clearing holes in collapsed locations. It avoids the uncontrollable trajectory of hole cleaning by water jetting, and also avoids the secondary damage of water jet drilling to the borehole, resulting in new collapsed holes and gas accumulation caused by local pressure concentration.

[0021] (7) The device of the present invention can quickly improve the gas extraction effect of a single borehole, ensure the gas pre-extraction effect of the ancestral face, and ensure the normal mining and excavation succession of the mine, which is conducive to achieving the dual benefits of mine safety production and efficient energy utilization.

[0022] (8) The gas extraction drilling dredging method provided by the present invention can greatly improve the dredging efficiency of drilling collapse in high-stress soft coal seams by adopting the above-mentioned continuous and rapid dredging device, while not causing secondary damage to the original drilling holes, thereby effectively improving the gas extraction rate. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a schematic diagram of the overall structure of the present invention; Figure 2 It is a structural schematic diagram of the continuous steel pipe advancing or retreating power mechanism in the present invention; Figure 3 It is a structural schematic diagram of the pneumatic drilling mechanism of the present invention; Figure 4 It is a schematic diagram of the working state of the present invention; In the figure, 1. power mechanism; 11. motor; 12. hydraulic pump; 2. continuous steel pipe winding mechanism; 21. roller bracket; 22. winding roller; 23. continuous steel pipe; 3. continuous steel pipe advancing or retreating power mechanism; 31. front telescopic cylinder; 32. front steel pipe clamp; 33. first rubber slip; 34. front position sensor; 35. rear telescopic cylinder; 36. rear steel pipe clamp; 37. second rubber slip; 38. rear position sensor; 39. sliding track; 310. front lifting cylinder; 311. rear lifting cylinder; 4. pneumatic drilling mechanism; 41. centralizer; 42. pneumatic screw motor; 43. cutting drill bit; 5. frame walking mechanism; 51. walking mechanism; 52. fuselage; 53. crawler; 6. frame. DETAILED DESCRIPTION

[0024] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention; it is obvious that the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments, and all other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making creative work are within the scope of protection of the present invention.

[0025] In the description of the present invention, it should be noted that the terms "upper", "lower", "inside", "outside", "top / bottom" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0026] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "provided with", "mounted / connected", "connected", etc. should be understood in a broad sense. For example, "connected" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0027] like Figure 1-4 As shown, the present invention provides a device for continuously and quickly clearing the collapse of gas extraction boreholes in soft coal seams, comprising: The continuous steel pipe winding mechanism 2 is used to wind or release the continuous steel pipe 23. The continuous steel pipe winding mechanism 2 can be any conventional winding mechanism in the art, and there is no special requirement for this. It should be noted that the continuous steel pipe 23 is preferably wound in layers on the continuous steel pipe winding mechanism 2, and the length of a single continuous steel pipe 23 is preferably more than 200m; A continuous steel pipe advancing or retreating power mechanism 3, used to perform straightening, advancing and retreating work of the continuous steel pipe 23; The pneumatic drilling mechanism 4 uses the compressed air in the mine compressed air system as a medium for treating the collapsed hole and as a driving force for the cutting drill bit 43 in the pneumatic drilling mechanism 4 to repair the collapsed borehole in the gas extraction of soft coal seams; The power mechanism 1 is used to provide power for the continuous steel pipe winding mechanism 2, the continuous steel pipe advancing or retreating power mechanism 3 and the pneumatic drilling mechanism 4.

[0028] The present invention also includes: The frame walking mechanism 5 is used to provide moving power for the continuous steel pipe winding mechanism 2, the continuous steel pipe advancing or retreating power mechanism 3 and the pneumatic drilling mechanism 4, which can be specifically: The frame traveling mechanism 5 comprises a body 52 and a traveling mechanism 51 , and the traveling mechanism 51 can be driven by a crawler belt 53 . The motor 11 on the device provides the crawler belt 53 with driving force to drive the traveling mechanism 51 to move through the hydraulic pump 12 .

[0029] In the present invention, Figure 1 As shown, an embodiment of a continuous steel pipe winding mechanism 2 is provided, and the continuous steel pipe winding mechanism 2 comprises: The roller support 21 is arranged on the frame 6; The winding drum 22 is rotatably connected to the drum bracket 21, and is used for winding or releasing the continuous steel pipe 23, wherein the winding drum 22 is fixed to the frame 6 and can rotate on the drum bracket 21, and the continuous steel pipe 23 can be wound or released by the forward or reverse rotation of the winding drum 22. The continuous steel pipe 23 is preferably wound on the winding drum 22 in layers, wherein the rotation connection method can be selected from conventional rotation methods in the field, and no special requirements are made for this, such as realizing the rotation connection through bearings.

[0030] In the present invention, Figure 2 As shown, an embodiment of a continuous steel pipe advancing or retreating power mechanism 3 is provided. The continuous steel pipe advancing or retreating power mechanism 3 is installed at the front end of the continuous steel pipe winding mechanism 2 and is used for straightening, advancing and retreating the continuous steel pipe 23, so as to facilitate the delivery of the air power drilling mechanism 4 (such as Figure 4 ). It includes: A sliding track 39 is arranged on the frame 6, and a front telescopic oil cylinder 31 and a rear telescopic oil cylinder 35 are respectively arranged at the front and rear parts thereof; The front steel pipe clamp 32 and the rear steel pipe clamp 36 are respectively connected to the output ends of the front telescopic oil cylinder 31 and the rear telescopic oil cylinder 35, and are both slidably connected to the sliding track 39; A front position sensor 34, which is disposed on the sliding track 39 and located between the front steel pipe clamp 32 and the rear steel pipe clamp 36; The rear position sensor 38 is disposed on the sliding track 39 and is located at the rear of the rear steel pipe clamp 36 .

[0031] In the above-mentioned continuous steel pipe advancing or retreating power mechanism 3 provided by the present invention, the front telescopic oil cylinder 31 and the rear telescopic oil cylinder 35 are respectively used to drive the front steel pipe clamp 32 and the rear steel pipe clamp 36 to slide on the sliding track 39, and the front position sensor 34 and the rear position sensor 38 are respectively used to detect the positions of the front steel pipe clamp 32 and the rear steel pipe clamp 36, thereby determining the moving distance thereof. Among them, the present invention provides a control method for the above-mentioned continuous steel pipe advancing or retreating power mechanism 3 to advance the continuous steel pipe or retreat the continuous steel pipe, which is specifically as follows: The front steel pipe clamp 32 clamps the continuous steel pipe, and the front telescopic cylinder 31 extends to drive the front steel pipe clamp 32 to move along the sliding track 39 to a certain distance from the front position sensor 34 (preferably 5 cm in front), triggering the front position sensor 34, and the front steel pipe clamp 32 continues to advance a certain distance (preferably 5 cm) and then opens, and the front telescopic cylinder 31 contracts to its original position. When the front steel pipe clamp 32 moves to a certain distance from the front position sensor (preferably 5 cm in front), the rear telescopic cylinder 35 begins to extend and drive the rear steel pipe clamp 36 to move a certain distance (preferably 5 cm) along the sliding track 39. When the speeds of the front telescopic cylinder 31 and the rear telescopic cylinder 35 are consistent, the rear clamp begins to clamp the continuous steel pipe 23, and moves to a certain distance from the rear position sensor 38 (preferably 5 cm in front), triggering the rear position sensor 38. The rear steel pipe clamp 36 continues to advance a certain distance (preferably 5 cm) and then opens. The front telescopic cylinder 31 begins to extend and drive the opened front steel pipe clamp 32 to move a certain distance (preferably 5 cm) along the sliding track 39 and clamp. The above actions are repeated to continuously advance or withdraw the steel pipe.

[0032] The present invention arranges the front telescopic oil cylinder 31 and the rear telescopic oil cylinder 35 in series to continuously push or withdraw the continuous steel pipe 23 from the drilling hole. The front telescopic oil cylinder 31 and the front steel pipe clamp 32 constitute the front steel pipe continuous pushing or retreating power mechanism, and the rear telescopic oil cylinder 35 and the rear steel pipe clamp 36 constitute the rear steel pipe continuous pushing or retreating power mechanism. When the oil cylinder is extended, the clamp is in a clamping state. When the oil cylinder is retracted, the clamp is in an open state. The continuous steel pipe pushing or retreating power mechanism 3 provides driving force for the front telescopic oil cylinder 31 and the rear telescopic oil cylinder 35 respectively through two hydraulic pumps 12 in the following power mechanism 1, and is combined with the position sensor for joint control to ensure pushing or retreating at the same speed.

[0033] Among them, the motor 11 is driven by the hydraulic pump 12, which is a prior art, that is, by converting the mechanical energy of the motor 11 into the pressure energy of the liquid, and then driving the actuator in the hydraulic system to move, and then providing driving force for the front telescopic cylinder 31, the front steel pipe clamp 32, the rear telescopic cylinder 35 and the rear steel pipe clamp 36. Among them, the front steel pipe clamp 32 and the rear steel pipe clamp 36 are preferably hydraulic pipe clamps. The above-mentioned frame walking mechanism 5 also uses the motor 11 to provide a driving machine for the crawler 53 through the hydraulic pump 12, thereby realizing the movement of the device. As for its specific structure, the conventional structure in this field can be selected, and it will not be repeated here.

[0034] In the present invention, the continuous steel pipe advancing or retreating power mechanism 3 has adjustable height and inclination, and further includes: The front lifting cylinder 310 and the rear lifting cylinder 311 are both arranged on the frame 6, and the output ends are connected to the front and rear of the sliding track 39 respectively.

[0035] It is preferred that the height and inclination angle be adjusted by supporting four front and rear lifting cylinders, which can be adjusted simultaneously to meet the original drilling hole opening height and inclination angle requirements.

[0036] In the present invention, the slips in the front steel pipe clamp 32 and / or the rear steel pipe clamp 36 are rubber slips, which cause less friction and extrusion damage to the continuous steel pipe 23. Figure 2 As shown, the slips in the front steel pipe clamp 32 are defined as first rubber slips 33 , and the slips in the rear steel pipe clamp 36 are defined as second rubber slips 37 .

[0037] In the present invention, Figure 3 As shown, a preferred embodiment of an air-powered drilling mechanism 4 is provided, and the air-powered drilling mechanism 4 comprises: The pneumatic screw motor 42 has one end connected to the continuous steel pipe 23 and the other end connected to the cutting drill bit 43, and drives the cutting drill bit 43 to rotate through the medium and low pressure air of the mine pressure air system.

[0038] Among them, the power of the cutting drill bit 43 is provided by the pneumatic screw motor 42. Considering that the mechanical strength and surrounding stress of the soft coal seam collapse hole part are still small even after being compacted, in the present invention, the power of the pneumatic screw motor 42 to drive the cutting drill bit 43 is directly taken from the existing compressed air system of the mine, and the pressure is preferably greater than 0.5MPa. Compared with the traditional hydraulic clearing, the pneumatic drilling mechanism 4 basically does not cause secondary damage to the borehole. At the same time, using air as the medium will not produce a water lock effect on the gas, thereby maximizing the gas extraction rate. It should be noted that part of the coal slag in the hole is discharged by compressed air, and the other part is discharged by the high-speed rotation of the cutting drill bit 43 combined with compressed air when withdrawing the drill. The pneumatic screw motor 42 is preferably connected to the continuous steel pipe 23 through a cone buckle.

[0039] The present invention also includes: The centralizer 41 is connected between the continuous steel pipe 23 and the pneumatic screw motor 42 to ensure that the entire drilling and dredging process is carried out along the original drilling trajectory. The centralizer 41 connects the continuous steel pipe 23 and the pneumatic screw motor 42. Since the collapse of the borehole in the soft coal seam may occur at any position around the hole, the centralizer 41 can ensure that the entire drilling and dredging process is carried out along the original drilling trajectory. The centralizer 41 is a conventional device in the art, and those skilled in the art are familiar with its composition and use method, which will not be repeated here.

[0040] In the present invention, the pneumatic drilling mechanism 4 ensures that the pressure is not less than 0.5 MPa.

[0041] In the present invention, the power mechanism 1 preferably includes a motor 11 and a hydraulic pump 12. The motor 11 is preferably a three-phase asynchronous motor 11 arranged on the frame 6. The three-phase asynchronous motor 11 provides driving force for the winding drum 22, the front telescopic cylinder 31, the rear telescopic cylinder 35, the pneumatic screw motor 42 and the frame walking mechanism 5 through the hydraulic pump 12 respectively.

[0042] The working principle of the above-mentioned device for continuous and rapid dredging of soft coal seam gas extraction borehole collapse provided by the present invention is as follows: When in use, the entire device is started. First, the air-powered drilling mechanism 4 is sent into the borehole, and then the gas extraction, coal dust collection and coal slag cleaning devices connected to the borehole are installed. Then, the continuous steel pipe 23 is connected to the mine compressed air system through a high-pressure hose, and the compressed air drives the cutting drill bit 43 to rotate and break the coal through the pneumatic screw motor 42. The continuous steel pipe advancing or retreating power mechanism 3 continuously advances the continuous steel pipe 23, and forms continuous drilling and retreat with the air-powered drilling mechanism 4. A continuous coal breaking mechanism is formed to ensure the smooth flow of the gas extraction channel.

[0043] On the other hand, the present invention also provides a method for using the above-mentioned device for continuously and quickly clearing the collapse of a borehole in a soft coal seam gas extraction process, preferably comprising the following steps: S1. Align the above device with the borehole to be dredged, and adjust the height and inclination of the continuous steel pipe advancing or retreating power mechanism 3 to be consistent with the opening height and inclination of the borehole; S2, start the continuous steel pipe winding mechanism 2 and the continuous steel pipe advancing or retreating power mechanism 3 to operate together, push the air power drilling mechanism 4 to the borehole, and install the gas extraction, coal dust capture and coal slag cleaning devices connected to the borehole; S3, connecting the mine compressed air system to the inlet of the continuous steel pipe 23 at the center of the continuous steel pipe winding mechanism 2 through a high-pressure hose (preferably installing a control valve), controlling the speed of the pneumatic screw motor 42 and thus controlling the coal breaking strength of the cutting drill bit 43; S4, the coal slag in the borehole is discharged in two ways, one is to discharge the coal slag in the front of the borehole by compressed air; the other is to discharge the deep and large coal slag by combining the high-speed rotation of the cutting drill bit 43 and compressed air when withdrawing the drill; S5. Repeat operations S1 to S4 to complete the dredging operations of all collapsed boreholes in sequence.

[0044] The above are only preferred specific implementations of the present invention; however, the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical solutions and improved concepts of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A device for continuously and quickly clearing the collapse of gas extraction boreholes in soft coal seams, characterized in that: include: Continuous steel pipe winding mechanism, used for winding or releasing the continuous steel pipe; A continuous steel pipe advancing or retreating power mechanism, used to perform straightening, advancing and retreating work of the continuous steel pipe; The pneumatic drilling mechanism uses compressed air in the mine compressed air system as a medium for treating collapsed holes and as a driving force for the cutting drill bit in the pneumatic drilling mechanism to repair collapsed holes in gas extraction in soft coal seams; The power mechanism is used to provide power for the continuous steel pipe winding mechanism, the continuous steel pipe advancing or retreating power mechanism and the pneumatic drilling mechanism.

2. The device for continuously and rapidly clearing the collapse of gas extraction boreholes in soft coal seams according to claim 1 is characterized in that: Also includes: The frame walking mechanism is used to provide moving power for the continuous steel pipe winding mechanism, the continuous steel pipe advancing or retreating power mechanism and the pneumatic drilling mechanism.

3. The device for continuously and rapidly clearing the collapse of gas extraction boreholes in soft coal seams according to claim 1 is characterized in that: The continuous steel pipe winding mechanism comprises: A roller bracket is arranged on the frame; The winding drum is rotatably connected to the drum support and is used for winding or releasing the continuous steel pipe.

4. The device for continuously and rapidly clearing the collapse of gas extraction boreholes in soft coal seams according to claim 1 is characterized in that: The continuous steel pipe advancing or retreating power mechanism includes: The sliding track is arranged on the frame, and the front and rear parts of the sliding track are respectively provided with a front telescopic oil cylinder and a rear telescopic oil cylinder; The front steel pipe clamp and the rear steel pipe clamp are respectively connected to the output ends of the front telescopic oil cylinder and the rear telescopic oil cylinder, and are both slidably connected to the sliding track; A front position sensor, which is arranged on the sliding track and located between the front steel pipe clamp and the rear steel pipe clamp; The rear position sensor is arranged on the sliding track and is located at the rear of the rear steel pipe clamp.

5. The device for continuously and rapidly clearing the collapse of gas extraction boreholes in soft coal seams according to claim 4 is characterized in that: Also includes: The front lifting oil cylinder and the rear lifting oil cylinder are both arranged on the frame, and the output ends are respectively connected to the front and rear of the sliding track.

6. The device for continuous and rapid dredging of gas extraction borehole collapse in soft coal seams according to claim 4 is characterized in that: The slips in the front steel pipe clamp and / or the rear steel pipe clamp are rubber slips.

7. The device for continuously and rapidly clearing the collapse of gas extraction boreholes in soft coal seams according to claim 1 is characterized in that: The pneumatic drilling mechanism comprises: A pneumatic screw motor, one end of which is connected to the continuous steel pipe, and the other end of which is connected to the cutting drill bit, drives the cutting drill bit to rotate through the medium and low pressure air of the mine pressure air system.

8. The device for continuous and rapid dredging of gas extraction borehole collapse in soft coal seams according to claim 7, characterized in that: Also includes: The centralizer is connected between the continuous steel pipe and the pneumatic screw motor to ensure that the entire drilling and dredging process is carried out along the original drilling trajectory.

9. A device for continuously and rapidly clearing the collapse of gas extraction boreholes in soft coal seams according to any one of claims 1 to 8, characterized in that: The pneumatic drilling mechanism ensures that the pressure is not less than 0.5 MPa.

10. A method for using a device for continuously and quickly clearing the collapse of a borehole in a soft coal seam gas extraction process according to any one of claims 1 to 9, characterized in that: The steps include: S1. Align the device with the borehole to be dredged, and adjust the height and inclination of the continuous steel pipe advancing or retreating power mechanism to be consistent with the opening height and inclination of the borehole; S2. Start the continuous steel pipe winding mechanism and the continuous steel pipe advancing or retreating power mechanism to operate together, advance the air power drilling mechanism to the borehole, and install the gas extraction, coal dust capture and coal slag cleaning devices connected to the borehole; S3, connect the mine compressed air system to the continuous steel pipe inlet, control the speed of the pneumatic screw motor and thus control the coal breaking strength of the cutting drill bit; S4. The coal slag in the borehole is discharged in two ways: one is to discharge the coal slag in the front of the borehole by compressed air; the other is to discharge the deep and large coal slag by combining the high-speed rotation of the cutting drill bit and compressed air when withdrawing the drill; S5. Repeat operations S1 to S4 to complete the dredging operations of all collapsed boreholes in sequence.

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