CN113338802B

CN113338802B - Fluidized hydraulic coal mining system for ground directional drilling

Info

Publication number: CN113338802B
Application number: CN202110758111.9A
Authority: CN
Inventors: 周福宝; 王凤超; 蒋名军; 王青祥; 刘应科; 郭成龙; 魏明尧; 叶国庆; 陈帅宇
Original assignee: China University of Mining and Technology CUMT
Current assignee: China University of Mining and Technology CUMT
Priority date: 2021-07-05
Filing date: 2021-07-05
Publication date: 2022-03-04
Anticipated expiration: 2041-07-05
Also published as: CN113338802A

Abstract

The invention discloses a fluidized hydraulic coal mining system for ground directional drilling, which comprises a directional drilling hydraulic coal mining part and a directional drilling coal-rock mixture conveying part, wherein the directional drilling hydraulic coal mining part is connected with a hydraulic pump; the directional drilling hydraulic coal mining part comprises a drilling and mining directional drilling machine, a directional coal mining drilling well, a coal mining directional drilling rod and a drilling and mining integrated device; the directional drilling coal-rock mixture conveying part comprises a drilling and sucking directional drilling machine, a directional coal sucking drilling well, a coal sucking directional drilling rod and a drilling and sucking integrated device. The invention is based on the directional drilling technology, a drilling and mining integrated device and a drilling and sucking integrated device are respectively utilized to drill a directional coal mining well and a directional coal sucking well from the ground, hydraulic cutting is carried out by the drilling and mining integrated device, the bottom end of a coal seam well drilling section is penetrated through with a coal seam through well drilling section by hydraulic cutting, and then a coal-rock mixture pump is pumped to the well by the drilling and sucking integrated device, so that the coal mining cost can be reduced on the premise of realizing underground operation without operators, and the invention is particularly suitable for coal mining on soft coal seams in an inclined trend.

Description

Fluidized hydraulic coal mining system for ground directional drilling

Technical Field

The invention relates to a hydraulic coal mining system, in particular to a ground directional drilling fluidization hydraulic coal mining system, and belongs to the technical field of coal mining.

Background

In the energy system of China, coal resources account for about 97 percent of the total amount of the proven fossil energy resources, and the coal resources are still the main energy sources for safe and stable supply of energy. At present, except for a small amount of open-pit coal mining, more than 90% of coal mines in China adopt a well mining mode, namely coal mining is carried out by arranging a coal mining roadway underground, and coal is transported to the ground through a transportation system. On one hand, the traditional underground mining mode needs to construct a large number of coal mining roadways and underground chambers which are produced in a matched mode, the geotechnical engineering quantity is large, the coal mining cost is high, shallow coal resources in China tend to be exhausted at present, the mining depth of the coal resources is increased at the speed of 10-25 meters per year on average, the mining depth coal resources become important supports for future coal serving as main energy in China, and the coal mining cost is undoubtedly further increased; on the other hand, although mechanized coal mining is currently implemented, a large number of operators are still needed in the operation links such as underground equipment installation and equipment operation, and once a coal and gas outburst accident occurs, a large number of casualties are caused, so that the safety of underground mining is not high.

The hydraulic coal mining is a mining technology which utilizes hydraulic power to complete all or part of the production links such as coal mining, transportation, lifting and the like in mine production, the arrangement of underground roadways and underground operators can be greatly reduced in a hydraulic coal mining mode, the coal mining cost is low, the coal mining safety is high, the hydraulic coal mining is usually applied to unstable coal seams, steeply inclined coal seams, re-mining coal seams and irregular areas or blocks of the coal seams, and the advantages of the hydraulic coal mining can be fully exerted as long as the conditions of the coal seams are proper.

Aiming at a drilling hydraulic coal mining technology, the Chinese patent with application number 02129521.2 discloses an unmanned underground drilling hydraulic coal mining method, which discloses that an exploitation pipe column comprising a high-pressure water channel, a compressed air channel and a slag return barrel and exploitation equipment comprising a jet nozzle, a mixing chamber and a scraper bit are arranged in a vertical shaft, and surrounding coal bodies are exploited and crushed by utilizing the exploitation pipe column to move up and down and rotate; compressed air is injected into the mixing chamber to generate gas lift, and water and coal are fully mixed at the slag suction port and are lifted to the ground surface through the slag return cylinder. According to the traditional mode of utilizing vertical shaft hydraulic power to mine coal and lifting a coal rock mixture cut by hydraulic power in situ through a vertical shaft, on one hand, if the mining pipe column disclosed by the invention is composed of four layers of concentric pipes with different diameters, the space of the slag return cylinder is greatly compressed by the high-pressure water channel and the compressed air channel, and the sealing effect needs to be ensured, so that the problems of complex mining equipment and process exist, the diameter size of a drilled hole of the coal mining vertical shaft is larger, and the construction cost is higher; on the other hand, the slag return barrels cannot be simultaneously lifted in the hydraulic coal mining process, so that the mining efficiency is low; on the other hand, because the compressibility of the gas is strong, the number and the trend of the cracks in the coal bed and the rock stratum cannot be determined specifically, and the absolute sealing effect cannot be guaranteed, the mode of lifting the coal by gas lift has instability, namely, when the coal rock mixture cut by hydraulic power is discharged through a slag discharge port at the top end of a slag return cylinder, the discontinuous phenomenon of fluctuation such as stagnation or blowout usually occurs.

In order to solve the above problems, the chinese patent application No. 201911037344.9 of the present applicant discloses a fluidized coal gas simultaneous mining system and a simultaneous mining method thereof, the fluidized coal gas simultaneous mining system includes a hydraulic coal mining part, a shaft bottom coal and rock processing part and a coal and rock conveying part, wherein the hydraulic coal mining part and the shaft bottom coal and rock processing part which are separately arranged can work and do not affect each other, the size of the diameter of a drilled hole of a coal mining shaft can be greatly reduced, the shaft bottom coal and rock processing part is arranged in a bottom roadway which is communicated with an independent conveying vertical well of the coal and rock conveying part, and a coal and rock mixture obtained by hydraulic coal mining can be conveyed to the shaft in a classified manner after coal and rock separation through the shaft bottom coal and rock processing part and the coal and rock conveying part. On one hand, the coal mining method still needs to dig a bottom roadway in the coal seam floor, and a large amount of mechanical equipment needs to be arranged in the bottom roadway, so that the problems that operation personnel needs to perform underground operation, coal and rock conveying equipment is complex, and the coal mining cost is relatively high exist; on the other hand, because the actual coal mining area range of a single coal mining well is limited (the actual coal mining range is a cylindrical area with the diameter of 2-5 m generally), and the coal mining amount of the single well is small, more coal mining wells need to be drilled on the ground within the coal seam trend range, the construction engineering amount is relatively large, and certain coal remains inevitably exist among a plurality of coal mining wells.

Disclosure of Invention

Aiming at the problems in the prior art, the invention provides a ground directional drilling fluidized hydraulic coal mining system which can reduce the coal mining cost on the premise of realizing underground operation without operators and is particularly suitable for coal mining of a soft coal bed in an inclined trend.

In order to achieve the purpose, the local surface directional drilling fluidization hydraulic coal mining system comprises a directional drilling hydraulic coal mining part and a directional drilling coal rock mixture conveying part;

the directional drilling hydraulic coal mining part comprises a drilling and mining directional drilling machine, a directional coal mining drilling well, a coal mining directional drilling rod and a drilling and mining integrated device; the drilling and production directional drilling machine is arranged on the ground; the directional coal mining drilling well is driven from the ground relative to the high end position of the coal bed inclined trend, and comprises a main coal mining drilling section along the up-down trend, a plurality of coal bed drilling sections extending to the low end position of the coal bed inclined trend along the coal bed inclined trend and a coal mining transition drilling section which is communicated with a coal mining transition drilling section arranged between the main coal mining drilling section and the coal bed drilling section; the coal mining directional drilling rod comprises a plurality of hollow drilling rod sections which are sealed and coaxially installed and connected into an integral structure, the top end of the coal mining directional drilling rod positioned at the wellhead position of the directional coal mining drilling well is hermetically installed and connected with the output end of the high-pressure water injection pipe, the input end of the high-pressure water injection pipe is hermetically communicated and connected with the water storage tank through the high-pressure water injection pump, and a coherent pressure medium channel is formed in a cavity inside the coal mining directional drilling rod; the drilling and mining integrated device is arranged at the bottom end of a coal mining directional drill rod and comprises a fluid control mechanism I, a drilling mechanism I and a hydraulic cutting mechanism, wherein the fluid control mechanism I is used for controlling the flowing direction of a pressure medium flowing through the coal mining directional drill rod;

the directional drilling coal-rock mixture conveying part comprises a drilling and sucking directional drilling machine, a directional coal sucking drilling well, a coal sucking directional drilling rod and a drilling and sucking integrated device; the drilling and sucking directional drilling machine is arranged on the ground; the directional coal-sucking drilling well is driven from the ground relative to the low end position of the inclined trend of the coal bed, the directional coal-sucking drilling well comprises a main coal-sucking drilling section along the vertical trend, a coal-bed through drilling section arranged along the width direction of the coal bed and a coal-sucking transition drilling section which is obliquely communicated and arranged between the main coal-sucking drilling section and the coal-bed through drilling section, and the coal-bed through drilling section is positioned at the bottom of the low end position of the inclined trend of the coal bed; the coal-absorbing directional drill rod comprises a plurality of hollow drill rod sections which are sealed and coaxially installed and connected into an integral structure, the top end of the coal-absorbing directional drill rod positioned at the wellhead position of the directional coal-absorbing drill well is hermetically installed and connected with the output end of a high-pressure water injection pipe, the input end of the high-pressure water injection pipe is hermetically communicated and connected with a water storage tank through a high-pressure water injection pump, a coherent pressure medium channel is formed in a cavity inside the coal-absorbing directional drill rod, and the pressure medium channel comprises a pressure water injection channel and a coal-absorbing channel; the drilling and sucking integrated device comprises a fluid control mechanism II, a drilling mechanism II arranged at the bottom end of a coal sucking directional drill rod and a coal sucking mechanism arranged on the coal sucking directional drill rod, wherein the fluid control mechanism II is used for controlling the flowing direction of a pressure medium flowing through the coal sucking directional drill rod, the drilling mechanism II comprises an adjustable bent shell II, a hole bottom screw motor II and a directional drill bit II arranged on the power output end of the hole bottom screw motor II through a universal shaft assembly, a drilling nozzle II with the injection direction facing the drilling direction is arranged on the directional drill bit II, the high-pressure input end of the hole bottom screw motor II is connected with a pressure water injection channel through the fluid control mechanism II, the low-pressure output end of the hole bottom screw motor II is connected with the drilling nozzle II in a sealing and communicating mode, the coal sucking mechanism comprises a plurality of slurry pumps which are arranged on the coal sucking directional drill rod in series, and the material input end and the material output end of each slurry pump are connected with the coal sucking channel in a sealing and communicating mode, the input end of the coal suction channel is connected with the fluid control mechanism II, and the output end of the coal suction channel is connected with a sedimentation tank on the ground.

As a further improvement scheme of the invention, the ground directional drilling fluidized hydraulic coal mining system further comprises a grouting filling part, wherein the grouting filling part comprises a slurry stirring station arranged near a drilling wellhead of the directional coal mining drilling well and a grouting port arranged on the fluid control mechanism I, the output end of the slurry stirring station is communicated and connected with the input end of a grouting pump, and the output end of the grouting pump is hermetically connected with the top end of a pressure medium channel of the coal mining directional drilling rod during grouting filling operation.

As a further improvement scheme of the invention, the fluid control mechanism I comprises a control valve group I and a sliding sleeve, wherein the pressure water input end of the control valve group I is hermetically communicated and connected with the bottom end of a pressure medium channel of the coal mining directional drilling rod, the sliding sleeve is sleeved on a hollow drilling rod section at the bottom end of the coal mining directional drilling rod in a sealing sliding fit mode, the pressure water output end of the control valve group I arranged behind the hole bottom screw motor I along the drilling direction is communicated and connected with the high-pressure input end of the hole bottom screw motor I, the sliding sleeve radially positioned and arranged relative to the hollow drilling rod section at the bottom end of the coal mining directional drilling rod comprises a sliding driving mechanism, a plurality of hydraulic cutting nozzle mounting holes penetrating through the sliding sleeve along the radial direction are arranged on the sliding sleeve, the hydraulic cutting nozzles are uniformly distributed along the circumferential direction of the sliding sleeve, the hydraulic cutting nozzles are arranged in the hydraulic cutting nozzle mounting holes, and grouting ports arranged corresponding to the hydraulic cutting nozzle mounting holes in number are arranged in a penetrating manner along the radial direction on the hollow drilling rod section at the bottom end of the coal mining directional drilling rod section And the slip casting port is matched with the slip stroke of the slip sleeve and is arranged corresponding to the position of the hydraulic cutting nozzle mounting hole, and the slip sleeve can slip back and forth and be positioned on the hollow drill rod section at the bottom end of the coal mining directional drill rod along the axial direction by controlling the action of the slip driving mechanism, so that the hydraulic cutting nozzle is in a state of being communicated with the slip casting port or in a state of being blocked in a staggered mode.

As a further improvement scheme of the invention, the hydraulic cutting nozzles are arranged on the directional drill bit I, and a plurality of hydraulic cutting nozzles are uniformly distributed along the circumferential direction of the directional drill bit I; the fluid control mechanism I comprises a control valve group I and a sliding sleeve, wherein the pressure water input end of the control valve group I is hermetically communicated and connected with the bottom end of a pressure medium channel of the coal mining directional drilling rod, the sliding sleeve is sleeved on a hollow drilling rod section at the bottom end of the coal mining directional drilling rod in a sealing sliding fit mode, the pressure water output end of the control valve group I arranged behind the hole bottom screw motor I in the drilling direction comprises a drilling pressure water output end and a hydraulic cutting pressure water output end, the drilling pressure water output end is communicated and connected with the high-pressure input end of the hole bottom screw motor I through a throttling control valve, the hydraulic cutting pressure water output end is communicated and connected with a hydraulic cutting nozzle through a sliding ring structure, the sliding sleeve comprises a sliding driving mechanism, a grouting port is arranged on the hollow drilling rod section at the bottom end of the coal mining directional drilling rod in a penetrating mode along the radial direction, the grouting port is matched with the sliding stroke of the sliding sleeve, and the sliding sleeve can be enabled to slide back and forth on the hollow drilling rod section at the bottom end of the coal mining directional drilling rod along the axial direction through the action of the sliding driving mechanism Positioning and making the grouting opening in a state of communicating with the outside or in a blocking state.

As a further improvement scheme of the invention, the ground directional drilling fluidized hydraulic coal mining system also comprises a gas extraction part, wherein the gas extraction part comprises a gas extraction pump arranged near the drilling wellhead position of the directional coal mining drilling well; during gas extraction operation, after slurry in a gap between a drill hole and a coal mining directional drill rod is emptied, the output end of a gas extraction pump is connected with a gas extraction inclined hole which penetrates through the top of a main coal mining drilling section to extract gas; or during gas extraction operation, after water in the pressure medium channel of the coal mining directional drill rod is drained, the output end of the gas extraction pump is connected with the pressure medium channel of the coal mining directional drill rod to extract gas.

As a further improvement scheme of the invention, a pressure water injection channel and a coal suction channel of the coal suction directional drill rod are the same pressure medium channel, the slurry pump is of a screw type submersible slurry pump structure, and a material input end of the slurry pump facing to the drilling direction and a material output end of the slurry pump facing away from the drilling direction are coaxially arranged with a hollow drill rod section of the coal suction directional drill rod; the fluid control mechanism II comprises a control valve group II arranged behind the hole bottom screw motor II along the drilling direction, a medium circulation port I of the control valve group II, which is back to the drilling direction, is hermetically communicated and connected with the bottom end of a pressure medium channel of the coal-absorbing directional drilling rod, and a medium circulation port II of the control valve group II, which faces the drilling direction, comprises a coal-absorbing port and a pressure water output port which is communicated and connected with a high-pressure input end of the hole bottom screw motor II.

As a further improvement scheme of the invention, the coal-absorbing directional drill rod is a sleeve structure at least comprising an inner pipe and an outer pipe which are coaxially arranged, the hollow inner cavity of the inner pipe is a pressure water injection channel, a cavity between the outer pipe and the inner pipe is a coal-absorbing channel, the slurry pump is an axial flow type submersible slurry pump structure which is coaxially arranged with the hollow drill rod section of the coal-absorbing directional drill rod and has a cavity structure at the axle center position, the slurry pump comprises a hollow shaft driving motor and a hollow shaft impeller which are coaxially arranged and in transmission connection, the outer diameter size of the hollow shaft driving motor is smaller than the inner diameter size of the outer pipe of the coal-absorbing directional drill rod, the outer diameter of the hollow shaft impeller is in clearance fit with the inner diameter of the outer pipe of the coal-absorbing directional drill rod, the slurry pump is coaxially erected and installed in the coal-absorbing directional drill rod through a support frame, the inner pipe of the coal-absorbing directional drill rod is positioned and connected in a cavity at the axis position of the slurry pump in a penetrating manner, and a communicated coal-absorbing channel is formed between the outer pipe and the inner pipe of the coal-absorbing directional drill rod; the fluid control mechanism II comprises a control valve group II arranged behind the hole bottom screw motor II along the drilling direction, a medium circulation port I of the control valve group II facing away from the drilling direction comprises a coal inlet port communicated with a coal suction channel of the coal suction directional drilling rod and a pressure water inlet port communicated with a pressure water inlet channel of the coal suction directional drilling rod, a medium circulation port II of the control valve group II facing the drilling direction comprises a coal inlet port communicated with the coal inlet port and a pressure water outlet port communicated with the pressure water inlet port, and the pressure water outlet port is communicated and connected with a high-pressure input end of the hole bottom screw motor II.

As a further improvement scheme of the invention, a telescopic isolation sleeve extending towards the drilling direction is arranged on the fluid control mechanism II, the inner diameter size of the telescopic isolation sleeve is matched with the size of a swing azimuth track circle of the directional drill bit II when the adjustable bending shell II is at the maximum bending angle, one end of the telescopic isolation sleeve, which deviates from the drilling direction, of the whole telescopic isolation sleeve comprising the telescopic driving mechanism is hermetically connected with the fluid control mechanism II, and a coal-rock mixture circulation channel is formed in a space between the inner surface of the telescopic isolation sleeve and the outer surface of the hole bottom screw motor II.

As a further improvement of the invention, a crushing structure which is convexly arranged and comprises cutting teeth is arranged on the inner surface of the telescopic isolation sleeve and/or the outer surface of the hole bottom screw motor II.

As a further improvement of the invention, the directional drill II comprises a large-diameter section facing the drilling direction and a small-diameter section facing away from the drilling direction, and a crushing structure which is arranged in a protruding manner and comprises cutting teeth is arranged on the outer surface of the small-diameter section.

Compared with the prior art, the local surface directional drilling fluidization hydraulic coal mining system is based on the directional drilling technology, a directional coal drilling well is drilled from the ground to the coal seam by using the drilling mechanism I and the coal mining directional drill rod of the drilling and mining integrated device at the high end position relative to the coal seam inclined trend, the drilling section of the coal seam extends to the low end position of the coal seam inclined trend along the coal seam inclined trend to the low end position of the coal seam inclined trend, a directional coal suction well is drilled from the ground to the coal seam by using the drilling mechanism II and the coal suction directional drill rod of the drilling and suction integrated device, the coal seam at the bottom of the coal seam inclined trend low end position penetrates through the drilling section and extends to the edge position of the coal seam width direction along the width direction of the coal seam, and hydraulic cutting is performed by adopting a backward hydraulic coal mining mode moving from the low end position of the coal seam inclined trend to the high end position through the hydraulic cutting mechanism of the drilling and mining integrated device, after the bottom position of the coal seam drilling section cut by water power is communicated with the coal seam through drilling section, the coal rock mixture cut by water power moves to the lower end position of the inclined trend of the coal seam in a fluidization state under the action of high-pressure water and the action of self gravity and enters the coal seam through drilling section, can be pumped by a slurry pump and is lifted to a sedimentation tank of a well head of a directional coal suction drilling well by a coal suction directional drill rod, a directional drilling hydraulic coal mining part and a directional drilling coal rock mixture conveying part which are separately arranged can work and do not influence each other, the reliability and the mining efficiency of a hydraulic coal mining process are greatly improved, hydraulic coal mining operation without underground operation of operators is realized, on one hand, the directional coal mining drilling well and the directional coal suction drilling well can realize relatively smaller hole diameter compared with the traditional hydraulic coal mining vertical well, on the other hand, bottom roadways do not need to be dug in a coal seam bottom plate, on the other hand, a mode that a plurality of coal seam drilling sections share the same main coal mining drilling section is adopted, so that relatively low coal mining cost can be realized; the goaf can be filled through a coal mining directional drill rod; the output end of the gas extraction pump can be connected with a gas extraction inclined hole which is arranged at the top of the main coal mining drilling section in a penetrating manner to extract gas after slurry in a gap between the drilling hole and the coal mining directional drilling rod is emptied, or the output end of the gas extraction pump can be connected with the coal mining directional drilling rod to extract gas after water in a pressure medium channel of the coal mining directional drilling rod is emptied; the continuous parallel coal mining operation can be realized along the width direction of the coal seam, the residual coal quantity is reduced to the maximum extent, and the method is particularly suitable for coal mining of soft coal seams in the inclined direction.

Drawings

FIG. 1 is a schematic three-dimensional structure of the present invention;

FIG. 2 is a schematic structural view of the present invention taken in cross section across the width of a coal seam;

FIG. 3 is a schematic diagram of the drilling and production integrated device of the present invention using a hydraulic cutting nozzle and a grouting port sharing a communication channel;

FIG. 4 is a schematic structural diagram of a state of developing directional coal mining drilling when the drilling and production integrated device of the present invention employs a hydraulic cutting nozzle and a grouting port to share a communication channel;

FIG. 5 is a schematic structural diagram of a hydraulic coal mining state when the drilling and mining integrated device of the invention adopts a hydraulic cutting nozzle and a grouting port to share a communication channel;

FIG. 6 is a schematic structural diagram of a filling state of the drilling and production integrated device of the present invention when a hydraulic cutting nozzle and a grouting port share a communication channel;

FIG. 7 is a schematic diagram of the drilling and production integrated device of the present invention using a hydraulic cutting nozzle disposed on a pilot bit I;

FIG. 8 is a schematic structural diagram of the drilling and mining integrated device of the present invention in a state of developing directional coal mining drilling and a state of hydraulic cutting when a hydraulic cutting nozzle is disposed on a directional drill bit I;

FIG. 9 is a schematic structural diagram of a filling state of the drilling and production integrated device provided by the invention when a hydraulic cutting nozzle is arranged on a directional drill bit I;

FIG. 10 is a schematic structural diagram of a coal-rock mixture flow channel of the drilling and suction integrated device in a closed state;

FIG. 11 is a schematic structural diagram of a coal-rock mixture flow channel of the drilling and suction integrated device in an open state;

FIG. 12 is a schematic view of the coal-sucking directional drill rod of the present invention using a pressure water injection passage and a coal-sucking passage sharing the same pressure medium passage;

FIG. 13 is a schematic view of the coal-sucking directional drill rod of the present invention in which a pressure water injection passage and a coal-sucking passage are separately provided;

FIG. 14 is a schematic view of the configuration of the mud pump and the coal-sucking directional drill rod of the present invention in which the mud pump employs an axial submersible mud pump configuration having a cavity configuration at the axial location;

FIG. 15 is a schematic representation of the three-dimensional structure of the well above the hydraulic coal mining and coal-rock mixture of the present invention;

fig. 16 is a schematic three-dimensional structure diagram of the present invention when performing the grouting filling of the gob.

In the figure: 1. directional coal mining and well drilling; 11. a main coal mining well drilling section; 12. drilling a well section of a coal seam; 13. coal mining transitional drilling sections; 2. coal mining directional drilling rods; 3. drilling and production integrated device; 31. a fluid control mechanism I; 311. a control valve group I; 312. a sliding sleeve; 32. a hole bottom screw motor I; 33. a directional drill bit I; 34. a hydraulic cutting nozzle; 4. drilling a well by directional coal absorption; 41. a main coal suction drilling section; 42. the coal seam penetrates through the well drilling section; 43. coal-absorbing transition drilling sections; 5. a coal-absorbing directional drill rod; 6. drilling and sucking integrated device; 61. a fluid control mechanism II; 611. a control valve group II; 612. a telescopic isolation sleeve; 62. a hole bottom screw motor II; 63. a directional drill bit II; 64. a slurry pump; 7. and (4) a grouting opening.

Detailed Description

The present invention will be further described with reference to the drawings (hereinafter, the coal seam is described with the inclined direction as the front-rear direction and the left-right direction with respect to the front-rear direction as the width direction).

As shown in fig. 1 and 2, the local surface directional drilling fluidization hydraulic coal mining system comprises a directional drilling hydraulic coal mining part and a directional drilling coal rock mixture conveying part.

The directional drilling hydraulic coal mining part comprises a drilling and mining directional drilling machine, a directional coal mining drilling well 1, a coal mining directional drilling rod 2 and a drilling and mining integrated device 3; the drilling and production directional drilling machine is arranged on the ground; the directional coal mining drilling well 1 is driven from the ground relative to the high-end position of the coal seam inclined trend, the directional coal mining drilling well 1 comprises a main coal mining drilling section 11 along the vertical trend, a plurality of coal seam drilling sections 12 extending to the low-end position of the coal seam inclined trend along the coal seam inclined trend and a coal mining transition drilling section 13 communicated with each other in a deflecting mode and arranged between the main coal mining drilling section 11 and the coal seam drilling sections 12, and aiming at the coal seam with the relatively large coal seam width, the main coal mining drilling section 11 can be located at the middle position of a set mining width range relative to the coal seam width direction (namely, the coal mining transition drilling section 13 can form a bilateral symmetry structure relative to the main coal mining drilling section 11 along the coal seam width direction); the coal mining directional drilling rod 2 comprises a plurality of hollow drilling rod sections which are sealed and coaxially installed and connected into an integral structure, the top end of the coal mining directional drilling rod 2 positioned at the wellhead position of the directional coal mining drilling well 1 is hermetically installed and connected with the output end of a high-pressure water injection pipe through a water feeder, the input end of the high-pressure water injection pipe is hermetically communicated and connected with a water storage tank through a high-pressure water injection pump, a coherent pressure medium channel is formed in a cavity inside the coal mining directional drilling rod 2, the drilling direction is conveniently and accurately controlled, and the coal mining directional drilling rod 2 can be of a cable-through directional drilling rod structure; as shown in fig. 4 to 6 and 8 to 9, the drilling and mining integrated device 3 is installed at the bottom end of the coal mining directional drilling rod 2, and comprises a fluid control mechanism i 31, a drilling mechanism i and a hydraulic cutting mechanism, wherein the fluid control mechanism i 31 is used for controlling the flow direction of a pressure medium flowing through the coal mining directional drilling rod 2, the drilling mechanism i comprises an adjustable bending shell i, a hole bottom screw motor i 32 and a directional drill bit i 33 installed on the power output end of the hole bottom screw motor i 32 through a universal shaft assembly and a transmission shaft assembly, the directional drill bit i 33 is provided with a drilling nozzle i with a spraying direction facing the drilling direction, the hydraulic cutting mechanism comprises a plurality of hydraulic cutting nozzles 34 with a spraying direction arranged along the radial direction of the directional drill bit i 33, the hydraulic cutting nozzles 34 can be obliquely arranged towards the drilling direction, the high-pressure input end of the hole bottom screw motor i 32 and the hydraulic cutting nozzles 34 are respectively connected with the fluid control mechanism i 31 in a sealing manner, and the low-pressure output end of the hole bottom screw motor I32 is hermetically communicated and connected with the drilling nozzle I through a slip ring structure.

The directional drilling coal and rock mixture conveying part comprises a drilling and sucking directional drilling machine, a directional coal sucking drilling well 4, a coal sucking directional drilling rod 5 and a drilling and sucking integrated device 6; the drilling and sucking directional drilling machine is arranged on the ground; the directional coal-sucking drilling well 4 is driven from the ground relative to the low end position of the coal bed inclined trend, the directional coal-sucking drilling well 4 comprises a main coal-sucking drilling section 41 along the vertical trend, a coal bed through drilling section 42 arranged along the width direction of the coal bed along the trend, and a coal-sucking transition drilling section 43 arranged between the main coal-sucking drilling section 41 and the coal bed through drilling section 42 in a deflecting and communicating manner, and the coal bed through drilling section 42 is positioned at the bottom of the low end position of the coal bed inclined trend; the coal-absorbing directional drill rod 5 comprises a plurality of hollow drill rod sections which are sealed and coaxially installed and connected into an integral structure, the top end of the coal-absorbing directional drill rod 5 positioned at the wellhead position of the directional coal-absorbing drill well 4 is hermetically installed and connected with the output end of a high-pressure water injection pipe through a water feeder, the input end of the high-pressure water injection pipe is hermetically communicated and connected with a water storage tank through a high-pressure water injection pump, a coherent pressure medium channel is formed in a cavity inside the coal-absorbing directional drill rod 5, and the pressure medium channel comprises a pressure water injection channel and a coal-absorbing channel; as shown in fig. 10 and 11, the drilling and suction integrated device 6 includes a fluid control mechanism ii 61, a drilling mechanism ii installed at the bottom end of the coal suction directional drilling rod 5, and a coal suction mechanism installed on the coal suction directional drilling rod 5, the fluid control mechanism ii 61 is used for controlling the flow direction of the pressure medium flowing through the coal suction directional drilling rod 5, the drilling mechanism ii includes an adjustable bending shell ii, a hole bottom screw motor ii 62, and a directional drill bit ii 63 installed on the power output end of the hole bottom screw motor ii 62 through a cardan shaft assembly and a transmission shaft assembly, the directional drill bit ii 63 is provided with a drilling nozzle ii with a spraying direction facing the drilling direction, the high pressure input end of the hole bottom screw motor ii 62 is connected with a pressure water injection channel through the fluid control mechanism ii 61, the low pressure output end of the hole bottom screw motor ii 62 is connected with the drilling nozzle ii through a slip ring structure in a sealing manner, the coal suction mechanism includes a plurality of slurry pumps 64 serially connected to the coal suction directional drilling rod 5, And the material input end and the material output end of the slurry pump 64 are hermetically communicated and connected with the coal suction channel, the input end of the coal suction channel is connected with the fluid control mechanism II 61, and the output end of the coal suction channel is connected with the sedimentation tank on the ground, and because a gap exists between the drilling hole and the coal suction directional drilling rod 5, energy input can be provided for driving the slurry pump 64, and further electric control or hydraulic control of the slurry pump 64 can be realized.

Before the utilization of a local directional drilling fluidization hydraulic coal mining system for mining operation, firstly carrying out well construction: determining the buried depth, the thickness, the inclination angle, the length range and the width range of a coal seam to be mined by adopting a ground penetrating radar detection method, arranging and connecting a high-pressure water injection pump and a water storage tank near the drilling wellhead position of a directional coal mining drilling well 1 after determining the wellhead drilling position of the directional coal mining drilling well 1 according to the length range and the width range of the coal seam, controlling a fluid control mechanism I31 to communicate a coal mining directional drilling rod 2 with a drilling mechanism I of the drilling and mining integrated device 3, starting the high-pressure water injection pump to drill, constructing and developing the directional coal mining drilling well 1 by connecting and pushing the coal mining directional drilling rod 2 step by adopting a drilling and mining integrated device 3 and a water feeder on the ground, entering a hole bottom screw rod motor I32 to push a screw rod to do work through a water feeder and a pressure medium channel of the coal mining directional drilling rod 2, and then ejecting the water through a drilling nozzle I of a directional drill bit I33, meanwhile, the power output end of the hole bottom screw motor I32 drives the directional drill bit I33 to rotate, debris generated in the drilling process is flushed by pressure water sprayed out of a drilling nozzle I of the directional drill bit I33 and is discharged from the drilling wellhead position of the directional coal mining drilling well 1 through a gap between a drilling hole and the coal mining directional drilling rod 2, after the drilling of the main coal mining drilling section 11 is completed, deflecting and drilling the coal mining transition drilling section 13 along the width direction of the coal seam, after drilling the coal mining transition drilling section 13 to the edge position of the width direction of the coal seam, deflecting and drilling the first coal seam drilling section 12 along the coal seam inclined trend to the lower end position of the coal seam inclined trend according to the hydraulic cutting range of the hydraulic cutting nozzles 34, stopping drilling after the first coal seam drilling section 12 is drilled to the lower end position of the coal seam inclined trend, wherein the mode of controlling the drilling direction in the drilling process is the prior art, and is not detailed herein; when the directional coal mining drilling well 1 is constructed and developed, the drilling and sucking integrated device 6 is installed on the coal-sucking directional drilling rod 5, after the well mouth drilling position of the directional coal-sucking drilling well 4 is determined according to the length range and the width range of a coal bed, a high-pressure water injection pump and a water storage tank are arranged and connected near the drilling well mouth position of the directional coal-sucking drilling well 4, a sedimentation tank is arranged, a control fluid control mechanism II 61 enables a pressure water injection channel of the coal-sucking directional drilling rod 5 to be communicated with a drilling mechanism II of the drilling and sucking integrated device 6, then a high-pressure water injection pump is started for drilling, the drilling and sucking directional drilling well 4 is constructed and developed by connecting the drilling and sucking integrated device 6 and a water feeder step by step on the ground and pushing the coal-sucking directional drilling rod 5, high-pressure water enters a hole bottom screw motor II 62 through the pressure medium channel of the water feeder and the coal-sucking directional drilling rod 5 to push a screw rod to apply work and then is ejected through a drilling nozzle II of a directional drill bit 63, meanwhile, the power output end of the hole bottom screw motor II 62 drives the directional drill bit II 63 to rotate, debris generated in the drilling process is washed by pressure water sprayed by a drilling nozzle II of the directional drill bit II 63 and is discharged from the drilling wellhead position of the directional coal-absorbing drilling well 4 through a gap between a drilling hole and the coal-absorbing directional drill rod 5, after the drilling of the main coal-absorbing drilling section 41 is completed, deflecting along the width direction of the coal seam and drilling the coal-absorbing transition drilling section 43 and the coal seam through drilling section 42, and the drilling is stopped after the coal seam through drilling section 42 is drilled to the edge position of the coal seam width direction.

Hydraulic coal mining: after the fluid control mechanism I31 is controlled to enable the coal mining directional drilling rod 2 to be communicated with a hydraulic cutting mechanism of the drilling and mining integrated device 3, water in a water storage tank is pressurized by a high-pressure water pump and then is sprayed out from a hydraulic cutting nozzle 34 through a water feeder and a pressure medium channel of the coal mining directional drilling rod 2 in a high-pressure and large-flow state to form high-pressure water jet to perform hydraulic cutting on a coal seam in a circumferential range, after the coal seam at the bottom end position of the first coal seam drilling section 12 is broken, the bottom end position of the first coal seam drilling section 12 is communicated with a coal seam through drilling section 42, and meanwhile, a drilling and mining directional drilling machine is controlled to enable the coal mining directional drilling rod 2 to slowly retract until the drilling and mining integrated device 3 retracts to the top end position of the first coal seam drilling section 12, so that a primary mining process is completed; in order to ensure the hydraulic coal mining effect, after the drilling and mining integrated device 3 retreats to the top end position of the coal seam drilling section 12, the fluid control mechanism I31 is controlled again to enable the coal mining directional drilling rod 2 to be communicated with the drilling mechanism I of the drilling and mining integrated device 3, then the drilling and mining directional drilling machine is controlled again to push the coal mining directional drilling rod 2 to enable the drilling and mining integrated device 3 to drill to the bottom end position of the coal seam drilling section 12 for secondary drilling, after the fluid control mechanism I31 is controlled again to enable the coal mining directional drilling rod 2 to be communicated with the hydraulic cutting mechanism of the drilling and mining integrated device 3, the drilling and mining directional drilling machine is controlled to enable the coal mining directional drilling rod 2 to retreat at a slow speed until the drilling and mining integrated device 3 retreats to the top end position of the first coal seam drilling section 12 for secondary hydraulic cutting, and the like in sequence, multiple times of drilling and multiple times of hydraulic cutting can be carried out in the coal seam drilling section 12, so as to realize that the coal resources in the coal seam drilling section 12 are completely hydraulically mined by all hydraulic mining, And the hydraulic crushing effect is ensured.

And (3) well ascending of the coal rock mixture: as shown in fig. 15, in the hydraulic coal mining process, the coal rock mixture cut by hydraulic power is fluidized under the action of high-pressure water scouring and the action of self gravity, moves to the lower end position of the inclined trend of the coal seam, enters the coal seam and penetrates through the drilling section 42, the output end of the coal suction channel of the coal suction directional drilling rod 5 is connected with the sedimentation tank, then the drilling and suction integrated device 6 is controlled to retreat to the position corresponding to the first coal seam drilling section 12 by the drilling and suction integrated device, the slurry pump 64 is started, the coal rock mixture is pumped by the slurry pump 64 and lifted to the sedimentation tank at the wellhead of the directional coal suction drilling well 4 through the coal suction channel of the coal suction directional drilling rod 5, and then subsequent coal rock separation can be carried out on the ground, and water in the sedimentation tank can be conveyed to the water storage tank for recycling through the water purification and pumping device.

And (3) performing parallel continuous coal mining operation: after all the coal resources in the first coal seam drilling section 12 are completely mined, firstly controlling a drilling and mining directional drilling machine to enable the drilling and mining integrated device 3 to retreat to a coal mining transition drilling section 13, deflecting and drilling a second coal seam drilling section 12 along the direction parallel to the first coal seam drilling section 12 according to the hydraulic cutting range of a hydraulic cutting nozzle 34, then performing hydraulic coal mining and coal-rock mixture well loading in the second coal seam drilling section 12, and repeating the steps until all the coal resources in the width direction of the coal seam are completely mined, so that hydraulic coal mining operation of underground operation without operators is realized. The mode of mining in sequence along the width direction of the coal seam can be adopted, and the mode of mining at intervals in sequence along the width direction of the coal seam can also be adopted.

In order to realize the filling of the goaf, as a further improvement scheme of the invention, the local directional drilling fluidization hydraulic coal mining system further comprises a grouting filling part, wherein the grouting filling part comprises a slurry stirring station arranged near the drilling wellhead of the directional coal mining drilling well 1 and a grouting port 7 arranged on the fluid control mechanism I31, the output end of the slurry stirring station is communicated and connected with the input end of a grouting pump, and the output end of the grouting pump is hermetically connected with the top end of a pressure medium channel of the coal mining directional drilling rod 2 during grouting filling operation. The volume value of the goaf can be converted according to the total amount of the discharged coal-rock mixture, after the mining of the coal seam drilling section 12 is finished and the concentration of the coal-rock mixture discharged through the pressure medium channel of the coal-absorbing directional drilling rod 5 is obviously reduced, the slurry pump 64 is closed, in order to avoid the situation that the filling slurry is submerged and enters the drilling-absorbing integrated device 6 and then solidifies to influence the subsequent coal-absorbing operation of the drilling-absorbing integrated device 6, the drilling-absorbing directional drilling machine can be controlled to enable the drilling-absorbing integrated device 6 to retreat to the peripheral area corresponding to the coal seam drilling section 12, then the output end of the slurry pump is hermetically connected with the top end of the pressure medium channel of the coal-mining directional drilling rod 2, the slurry pump is started after the coal-mining directional drilling rod 2 is communicated with the slurry injection port 7 by controlling the fluid control mechanism I31, as shown in figure 16, the filling slurry is flushed from the injection port 7 through the pressure medium channel of the coal-mining directional drilling rod 2 to fill the goaf of the coal seam drilling section 12, and after the grouting amount reaches a set value set according to the volume value of the goaf, closing the grouting pump, removing the grouting pump, hermetically installing and connecting the top end of a pressure medium channel of the coal mining directional drilling rod 2 with the output end of the high-pressure water injection pipe, starting the high-pressure water pump to enable water in the water storage tank to enter the coal mining directional drilling rod 2 through the high-pressure water pump, flushing the pressure medium channel of the coal mining directional drilling rod 2, flushing filling slurry retained in the pressure medium channel of the coal mining directional drilling rod 2 into the goaf, avoiding the phenomenon of slurry solidification in the pressure medium channel of the coal mining directional drilling rod 2, closing the high-pressure water pump after the set flushing time, and controlling the fluid control mechanism I31 to cut off the connection between the coal mining directional drilling rod 2 and the grouting port 7. The goaf filling mode can adopt a goaf filling mode of performing grouting filling in a centralized manner after all the coal seam drilling sections 12 in the coal seam width direction are completely mined, or can adopt a goaf filling mode of performing grouting filling on one coal seam drilling section 12 after the mining of the coal seam drilling section 12 is completed, and the goaf filling mode of the latter can greatly reduce the influence of the goaf on surface buildings; on the basis of adopting the latter goaf filling mode, a mode of sequentially exploiting the coal seam drilling sections 12 at intervals along the coal seam width direction and mining can be adopted, that is, taking the example that a first coal seam drilling section 12, a second coal seam drilling section 12 and a third coal seam drilling section 12 and … … are sequentially arranged from one end edge position to the other end edge position along the coal seam width direction, after the coal mining operation of the first coal seam drilling section 12 is completed, the goaf of the first coal seam drilling section 12 is filled by grouting, then the slurry in the goaf of the first coal seam drilling section 12 is not required to be solidified, the fourth coal seam drilling section 12 can be exploited and coal mining operation can be performed, then the goaf of the fourth coal seam drilling section 12 is filled by grouting, and the fourth coal seam drilling section 12 is subjected to coal mining operation and filling operation, and slurry in the goaf of the first coal seam drilling section 12 is solidified, namely, the second coal seam drilling section 12 can be exploited and coal mining operation can be carried out, and the like, so that continuous mining operation without waiting for slurry solidification in the goaf can be realized.

In order to simplify the mechanism arrangement and facilitate the realization of injecting high-pressure water and filling slurry through the coal mining directional drilling rod 2, as a further improvement scheme of the invention, a mode that a hydraulic cutting nozzle 34 and a grouting port 7 share a communication channel is adopted, that is, as shown in fig. 3 to 6, a fluid control mechanism I31 comprises a control valve group I311 with a pressure water input end hermetically communicated and connected with the bottom end of a pressure medium channel of the coal mining directional drilling rod 2 and a sliding sleeve 312 sleeved on a hollow drilling rod section at the bottom end of the coal mining directional drilling rod 2 in a sealing and sliding fit manner, a pressure water output end of the control valve group I311 arranged behind a hole bottom screw motor I32 along the drilling direction is communicated and connected with a high-pressure input end of the hole bottom screw motor I32, the sliding sleeve 312 positioned in the radial direction relative to the hollow drilling rod section at the bottom end of the coal mining directional drilling rod 2 comprises a sliding driving mechanism, and the sliding driving mechanism can be a hollow hydraulic cylinder structure or a hollow electric cylinder structure and the like, The telescopic control structure can be sleeved and installed on the hollow drill rod section, the sliding sleeve 312 is provided with a plurality of hydraulic cutting nozzle installation holes which penetrate through the sliding sleeve 312 along the radial direction, the plurality of hydraulic cutting nozzle installation holes are uniformly distributed along the circumferential direction of the sliding sleeve 312, the hydraulic cutting nozzles 34 are installed in the hydraulic cutting nozzle installation holes, the grouting ports 7 with the number corresponding to the hydraulic cutting nozzle installation holes are arranged on the hollow drill rod section at the bottom end of the coal mining directional drill rod 2 in a penetrating way along the radial direction, and the grouting port 7 is matched with the sliding stroke of the sliding sleeve 312 and is arranged corresponding to the position of the hydraulic cutting nozzle mounting hole, the sliding sleeve 312 can slide back and forth and be positioned on the hollow drill rod section at the bottom end of the coal mining directional drill rod 2 along the axial direction by controlling the action of the sliding driving mechanism, so that the hydraulic cutting nozzle 34 is in a state of being communicated with the grouting opening 7 or in a staggered plugging state. When the directional coal mining drilling well 1 is developed, the sliding sleeve 312 is controlled to slide and position, the hydraulic cutting nozzle 34 is in a state of being blocked with the grouting opening 7 in a staggered mode, the pressure water input end of the control valve group I311 is in an open state, and at the moment, high-pressure water can enter the hole bottom screw motor I32 through a water feeder and a pressure medium channel of the coal mining directional drilling rod 2 to achieve drilling; when hydraulic coal mining is carried out, the control sliding sleeve 312 slides and is positioned, the hydraulic cutting nozzle 34 is in a state of being communicated with the grouting port 7, the pressure water input end of the control valve group I311 is in a closed state, and at the moment, high-pressure water can enter the grouting port 7 through a water feeder and a pressure medium channel of the coal mining directional drilling rod 2 and is sprayed out through the hydraulic cutting nozzle 34 to realize hydraulic cutting; during filling operation, the control sliding sleeve 312 slides and is positioned, so that the hydraulic cutting nozzle 34 is in a state of being staggered with the grouting opening 7, the grouting opening 7 is in a state of being communicated with the outside, the pressure water input end of the control valve group I311 is in a closed state, and filling slurry can flow out from the grouting opening 7 through a pressure medium channel of the coal mining directional drilling rod 2 to realize filling.

In order to achieve a better hydraulic cutting effect, as a further improvement of the present invention, a mode that the hydraulic cutting nozzles 34 are arranged on the pilot bit i 33 is adopted, that is, as shown in fig. 7 to 9, the hydraulic cutting nozzles 34 are arranged on the pilot bit i 33, and a plurality of hydraulic cutting nozzles 34 are uniformly arranged along the circumferential direction of the pilot bit i 33; the fluid control mechanism I31 comprises a control valve group I311 with a pressure water input end hermetically communicated and connected with the bottom end of a pressure medium channel of the coal mining directional drilling rod 2 and a sliding sleeve 312 sleeved on a hollow drilling rod section at the bottom end of the coal mining directional drilling rod 2 in a sealing and sliding fit manner, a pressure water output end of the control valve group I311 arranged behind the hole bottom screw motor I32 along the drilling direction comprises a drilling pressure water output end and a hydraulic cutting pressure water output end, the drilling pressure water output end is communicated and connected with a high-pressure input end of the hole bottom screw motor I32 through a throttling control valve, the hydraulic cutting pressure water output end is communicated and connected with the hydraulic cutting nozzle 34 through a sliding ring structure, the sliding sleeve 312 comprises a sliding driving mechanism, the sliding driving mechanism is a telescopic control structure with a hollow structure, such as a hollow hydraulic cylinder structure or a hollow electric cylinder structure, and the like, a grouting port 7 is arranged on the hollow drilling rod section at the bottom end of the coal mining directional drilling rod 2 along the radial direction, and the slip stroke setting of slip cover 312 is cooperated with the slip port 7, the slip cover 312 can slip back and forth and be positioned on the hollow drill rod section at the bottom end of the coal mining directional drill rod 2 along the axial direction by controlling the action of the slip driving mechanism, so that the slip port 7 is in a state of being communicated with the outside or in a blocking state. When the directional coal mining drilling well 1 is developed, the sliding sleeve 312 is controlled to slide and position, the grouting port 7 is in a state of being blocked with the outside, the pressure water input end of the control valve group I311 is in an open state, the throttling control valve on the drilling pressure water output end is in a fully open state, and the hydraulic cutting pressure water output end is in a closed state, and at the moment, high-pressure water can enter the hole bottom screw motor I32 through a water feeder and a pressure medium channel of the coal mining directional drilling rod 2 to realize drilling; when hydraulic coal mining is carried out, the control sliding sleeve 312 slides and is positioned, the grouting port 7 is in a state of being blocked with the outside, the pressure water input end of the control valve group I311 is in an open state, the throttling control valve on the drilling pressure water output end is in a throttling state, and the hydraulic cutting pressure water output end is in a fully open state, at the moment, high-pressure water can enter the control valve group I311 through a water feeder and a pressure medium channel of the coal mining directional drill rod 2 and is sprayed out through the hydraulic cutting nozzle 34 to realize hydraulic cutting, meanwhile, part of pressure water enters the hole bottom screw motor I32 to push the directional drill bit I33 to rotate at a low speed, the hydraulic cutting nozzle 34 rotates around the axis of the directional drill bit I33 at one side, and hydraulic cutting is carried out at the other side, and a better hydraulic cutting effect is further realized; during filling operation, the control sliding sleeve 312 slides and is positioned, the grouting port 7 is in a state of being communicated with the outside, the pressure water input end of the control valve group I311 is in a closed state, and filling slurry can flow out from the grouting port 7 through a pressure medium channel of the coal mining directional drilling rod 2 to realize filling.

Aiming at a soft coal seam with easily-extruded coal and gas, in order to extract the gas of the extruded coal seam, as a further improvement scheme of the invention, the local directional drilling fluidized hydraulic coal mining system also comprises a gas extraction part, wherein the gas extraction part comprises a gas extraction pump and a high-pressure gas injection pump which are arranged near the drilling wellhead position of the directional coal mining drilling well 1. The method of simultaneously extracting gas in the hydraulic coal mining process by adopting the gas extraction inclined hole can be adopted, namely, as shown in fig. 1, a gas extraction inclined hole communicated with the main coal mining drilling section 11 is arranged at the top of the main coal mining drilling section, when a directional coal mining drilling 1 is developed, debris generated in the drilling process can be discharged from the gas extraction inclined hole through a gap between the drilling hole and the coal mining directional drilling rod 2, so that the gas extraction inclined hole is used as a slurry return port, in the hydraulic coal mining process, the orifice position of the main coal mining drilling section 11 is sealed, then the gas extraction inclined hole is hermetically connected with a high-pressure gas injection pump through a pipeline, then starting a high-pressure gas injection pump to inject high-pressure gas into the gas extraction inclined hole, emptying slurry in a gap between the drill hole and the coal mining directional drill rod 2 to a coal seam drilling section 12, then, the gas extraction inclined hole is hermetically connected with a gas extraction pump through a pipeline, and the gas extraction pump is started to realize simultaneous gas extraction in the hydraulic coal mining process; or a mode of intermittently performing hydraulic coal mining and gas extraction can be adopted, namely, in the hydraulic coal mining process, after the drilling and mining integrated device 3 is retreated to the top end position of the coal seam drilling section 12, the pressure medium channel of the coal mining directional drilling rod 2 is hermetically connected with a high-pressure gas injection pump through a pipeline, then the high-pressure gas injection pump is started to inject high-pressure gas into the pressure medium channel of the coal mining directional drilling rod 2, water in the pressure medium channel of the coal mining directional drilling rod 2 is discharged to the coal seam drilling section 12, then the pressure medium channel of the coal mining directional drilling rod 2 is hermetically connected with the gas extraction pump through a pipeline, the gas extraction pump is started to perform gas extraction, when the concentration of the extracted gas is obviously reduced, the gas extraction pump is removed, the connection between the pressure medium channel of the coal mining directional drilling rod 2 and a pressure water input pipeline is recovered, the hydraulic coal mining is continuously performed, and the rest on the same, and hydraulic coal mining and gas extraction are carried out intermittently.

In order to simplify the mechanism setting and facilitate the realization of injecting high pressure water and absorbing coal through the coal-absorbing directional drill rod 5, as a further improvement scheme of the invention, a mode that a pressure water injection channel and a coal-absorbing channel share the same pressure medium channel is adopted, and because the screw-type submersible slurry pump has the bidirectional conveying characteristic of being capable of conveying materials in the forward direction and the reverse direction, the screw-type submersible slurry pump can be adopted, namely, the pressure water injection channel and the coal-absorbing channel of the coal-absorbing directional drill rod 5 are the same pressure medium channel, the slurry pump 64 is of a screw-type submersible slurry pump structure, and the material input end of the slurry pump 64 facing the drilling direction and the material output end of the slurry pump 64 facing away from the drilling direction are coaxially arranged with the hollow drill rod section of the coal-absorbing directional drill rod 5; the fluid control mechanism II 61 comprises a control valve group II 611 arranged behind the hole bottom screw motor II 62 along the drilling direction, a medium circulation port I of the control valve group II 611 facing away from the drilling direction is connected with the bottom end of a pressure medium channel of the coal-absorbing directional drill rod 5 in a sealing and communicating mode, and a medium circulation port II of the control valve group II 611 facing towards the drilling direction comprises a coal-absorbing port and a pressure water output port connected with a high-pressure input end of the hole bottom screw motor II 62 in a communicating mode. As shown in fig. 12, when the directional coal mining drilling 1 is developed, the pressure water output port of the control valve group ii 611 is in an open state, and the coal suction port is in a closed state, and at this time, high-pressure water can enter the hole bottom screw motor ii 62 through the pressure medium channel of the water feeder and the coal suction directional drilling rod 5 to realize drilling; when the coal is sucked, the pressure water output port of the control valve group II 611 is in a closed state, the coal suction port is in an open state, and then the slurry pump 64 is started, because the pressure medium channel of the coal suction directional drill rod 5 is filled with water, the slurry pump 64 is prevented from being damaged due to idling, the coal rock mixture cut by water power can enter the pressure medium channel of the coal suction directional drill rod 5 through the coal suction port, and the pressure water injection channel and the coal suction channel of the coal suction directional drill rod 5 share the same pressure medium channel.

In order to avoid the blockage caused by the deposition of the coal rock mixture and further the incapability of coal absorption, as a further improvement of the invention, a stirring and rotating action mode of the directional drill bit II 63 in the coal absorption process can be adopted, namely, the coal absorption directional drill rod 5 is a sleeve structure at least comprising an inner pipe and an outer pipe which are coaxially arranged, the hollow inner cavity of the inner pipe is a pressure water injection passage, the cavity between the outer pipe and the inner pipe is a coal absorption passage, the slurry pump 64 is an axial flow type submersible slurry pump structure which is coaxially arranged with the hollow drill rod section of the coal absorption directional drill rod 5 and has a cavity structure at the axial center position, as shown in figure 14, the slurry pump 64 comprises a hollow shaft driving motor and a hollow shaft impeller which are coaxially arranged and in transmission connection, the outer diameter size of the hollow shaft driving motor is smaller than the inner diameter size of the outer pipe of the coal absorption directional drill rod 5, and the outer diameter size of the hollow shaft impeller is in clearance fit with the inner diameter size of the outer pipe of the coal absorption directional drill rod 5, the slurry pump 64 is coaxially erected and installed in the coal-absorbing directional drill rod 5 through a support frame, an inner pipe of the coal-absorbing directional drill rod 5 is positioned and penetrated in a cavity at the axis position of the slurry pump 64, and a communicated coal-absorbing channel is formed between an outer pipe and an inner pipe of the coal-absorbing directional drill rod 5; the fluid control mechanism II 61 comprises a control valve group II 611 arranged behind the hole bottom screw motor II 62 along the drilling direction, a medium circulation port I of the control valve group II 611 facing away from the drilling direction comprises a coal circulation port communicated with a coal suction channel of the coal suction directional drilling rod 5 and a pressure water injection port communicated with a pressure water injection channel of the coal suction directional drilling rod 5, the medium circulation port II of the control valve group II 611 facing the drilling direction comprises a coal suction port communicated with the coal circulation port and a pressure water output port communicated with the pressure water injection port, and the pressure water output port is communicated and connected with a high-pressure input end of the hole bottom screw motor II 62 through a throttle valve. As shown in fig. 13, when the directional coal mining drilling 1 is developed, the pressure water output port of the control valve group ii 611 is in an open state, the throttle valve is in a fully open state, and the coal suction port is in a closed state, and at this time, high-pressure water can enter the hole bottom screw motor ii 62 through the pressure water injection channel of the water feeder and the coal suction directional drilling rod 5 to realize drilling; during coal suction operation, the pressure water output port of the control valve group II 611 is firstly in an open state, the throttle valve is in a throttling state, and the coal suction port is in an open state, so that the slurry pump 64 is prevented from being damaged due to idling, water can be filled into the coal suction channel of the coal suction directional drill rod 5 firstly, then the slurry pump 64 is started, the coal rock mixture cut by water power can enter the coal suction channel of the coal suction directional drill rod 5 through the coal suction port, and meanwhile, high-pressure water can enter the hole bottom screw motor II 62 in a throttling state through the water feeder and the pressure water injection channel of the coal suction directional drill rod 5, so that the directional drill bit II 63 can perform slow stirring rotation action, and deposition of the coal rock mixture is avoided.

In order to avoid blocking the coal suction port by the large coal-rock mixture particles, as a further improvement scheme of the invention, as shown in fig. 10 and fig. 11, a telescopic isolation sleeve 612 extending towards the drilling direction is arranged on the fluid control mechanism ii 61, the inner diameter of the telescopic isolation sleeve 612 is matched with the swing direction track circle of the directional bit ii 63 when the adjustable bending shell ii is at the maximum bending angle, that is, the directional bit ii 63 does not interfere with the telescopic isolation sleeve 612 when the adjustable bending shell ii is adjusted to the maximum bending angle, one end of the telescopic isolation sleeve 612 comprising a telescopic driving mechanism, which is wholly deviated from the drilling direction, is hermetically connected with the fluid control mechanism ii 61, the telescopic driving mechanism can be a telescopic control structure which has a hollow structure and can be sleeved outside the hole bottom screw motor ii 62, such as a hollow hydraulic cylinder structure or a hollow electric cylinder structure, and a coal-rock mixture flow passage is formed in a space between the inner surface of the telescopic isolation sleeve 612 and the outer surface of the hole bottom screw motor II 62. By the arrangement, the coal-rock mixture circulation channel can be opened by controlling the telescopic isolation sleeve 612 to retract in the direction away from the drilling direction during coal suction operation, so that coal-rock mixture particles can only enter the coal suction port through the coal-rock mixture circulation channel inlet between the directional drill II 63 and the telescopic isolation sleeve 612 and cannot directly enter the coal suction port, and the phenomenon that large coal-rock mixture particles block the coal suction port is avoided; in addition, due to the arrangement of the telescopic isolation sleeve 612, the coal-rock mixture flow channel can be closed by controlling the telescopic isolation sleeve 612 to extend towards the direction facing the drilling direction during grouting filling operation, and although a certain gap exists between the directional drill bit II 63 and the telescopic isolation sleeve 612 due to the bending angle of the bending adjustable shell II, a certain plugging effect can be realized, and thick filling slurry is prevented from being directly poured into the coal seam to penetrate through the drilling section 42.

In order to further avoid the blockage of the coal suction port by the large coal-rock mixture particles, as shown in fig. 10 and 11, as a further improvement scheme of the invention, a crushing structure which is convexly arranged and comprises cutting teeth is arranged on the inner surface of the telescopic isolation sleeve 612 and/or the outer surface of the hole bottom screw motor ii 62, and the coal suction operation can be realized by controlling the reciprocating telescopic action of the telescopic isolation sleeve 612 to grind and crush the coal-rock mixture entering the coal-rock mixture flow passage, so that the blockage of the coal-rock mixture particles on the coal suction port is further avoided. The crushing structure arranged in a protruding mode can be a conical surface structure arranged along the drilling direction, and the telescopic isolation sleeve 612 can extrude and crush coal and rock mixtures through the conical surface structure in the reciprocating telescopic action process, so that a better crushing effect is achieved.

In order to further avoid the blockage of the coal suction port by the large coal-rock mixture particles, as a further improvement of the invention, as shown in fig. 10 and 11, the directional drill bit ii 63 comprises a large-diameter section facing the drilling direction and a small-diameter section facing away from the drilling direction, and a crushing structure which is convexly arranged and comprises cutting teeth is arranged on the outer surface of the small-diameter section. So set up, can adjust adjustable curved casing II when inhaling the coal operation and control II 63 of directional drill and stir the in-process that gyrates the action after minimum bend angle and realize that the bold coal petrography mixture is broken earlier and then get into coal petrography mixture circulation passageway, adjust adjustable curved casing II to minimum bend angle and can make II 63 of directional drill realize more even crushing effect, and then avoid blockking up and inhale the coal port. The crushing structure that the protrusion set up can be whole along the auger delivery structure who inhales coal direction spiral setting, and directional drill II 63 can realize carrying when carrying out the breakage to the coal petrography mixture through auger delivery structure in the in-process that stirs the gyration action.

The local surface directional drilling fluidization hydraulic coal mining system is based on the directional drilling technology, a directional coal drilling well 1 is drilled on the coal seam from the ground by using a drilling mechanism I and a coal mining directional drilling rod 2 of a drilling and mining integrated device 3 at the high end position of the inclined trend of the coal seam, a coal drilling section 12 extends to the low end position of the inclined trend of the coal seam along the inclined trend of the coal seam, a directional coal suction drilling well 4 is drilled on the coal seam from the ground by using a drilling mechanism II and a coal suction directional drilling rod 5 of a drilling and suction integrated device 6, the coal seam at the bottom of the inclined trend low end position of the coal seam penetrates through the drilling section 42 and extends to the edge position of the width direction of the coal seam along the width direction of the coal seam, and hydraulic cutting is carried out on the coal seam by adopting a backward hydraulic coal mining mode moving from the low end position of the inclined trend of the coal seam to the high end position through a hydraulic cutting mechanism of the drilling and mining integrated device 3, after the bottom end position of the coal seam drilling section 12 cut by hydraulic power is communicated with the coal seam through drilling section 42, the coal rock mixture cut by hydraulic power is fluidized under the action of high-pressure water and the action of self gravity, moves to the lower end position of the inclined trend of the coal seam, enters the coal seam through drilling section 42, can be pumped by a slurry pump 64 and is lifted to a sedimentation tank at the wellhead of the directional coal suction drilling well 4 through a coal suction directional drilling rod 5, a directional drilling hydraulic coal mining part and a directional drilling coal rock mixture conveying part which are arranged separately can work and do not influence each other, the reliability and the mining efficiency of a hydraulic coal mining process are greatly improved, the hydraulic coal mining operation of underground operation without operators is realized, on one hand, the directional coal mining drilling well 1 and the directional coal suction drilling well 4 can realize relatively smaller drilling hole diameter compared with the traditional hydraulic coal mining vertical well, on the other hand, on the other hand, a mode that a plurality of coal seam drilling sections 12 share the same main coal mining drilling section 11 is adopted, so that relatively low coal mining cost can be realized; the goaf can be filled through the coal mining directional drilling rod 2; the output end of the gas extraction pump can be connected with a gas extraction inclined hole which is arranged at the top of the main coal mining drilling section 11 in a penetrating manner to extract gas after slurry in a gap between the drilling hole and the coal mining directional drilling rod 2 can be emptied, or the output end of the gas extraction pump can be connected with the coal mining directional drilling rod 2 to extract gas after water in a pressure medium channel of the coal mining directional drilling rod 2 can be emptied; the continuous parallel coal mining operation can be realized along the width direction of the coal seam, the residual coal quantity is reduced to the maximum extent, and the method is particularly suitable for coal mining of soft coal seams in the inclined direction.

Claims

1. A fluidized hydraulic coal mining system for ground directional drilling is characterized by comprising a directional drilling hydraulic coal mining part and a directional drilling coal-rock mixture conveying part;

the directional drilling hydraulic coal mining part comprises a drilling and mining directional drilling machine, a directional coal mining drilling well (1), a coal mining directional drilling rod (2) and a drilling and mining integrated device (3); the drilling and production directional drilling machine is arranged on the ground; the directional coal mining drilling well (1) is driven from the ground relative to the high-end position of the coal bed inclined direction, and the directional coal mining drilling well (1) comprises a main coal mining drilling well section (11) along the vertical direction, a plurality of coal bed drilling well sections (12) extending to the low-end position of the coal bed inclined direction along the coal bed inclined direction and a coal mining transition drilling well section (13) which is obliquely communicated and arranged between the main coal mining drilling well section (11) and the coal bed drilling well sections (12); the coal mining directional drilling rod (2) comprises a plurality of hollow drilling rod sections which are sealed and coaxially mounted and connected into an integral structure, the top end of the coal mining directional drilling rod (2) positioned at the wellhead position of the directional coal mining drilling well (1) is hermetically mounted and connected with the output end of a high-pressure water injection pipe, the input end of the high-pressure water injection pipe is hermetically communicated and connected with a water storage tank through a high-pressure water injection pump, and a coherent pressure medium channel is formed in a cavity inside the coal mining directional drilling rod (2); the drilling and mining integrated device (3) is arranged at the bottom end of a coal mining directional drilling rod (2) and comprises a fluid control mechanism I (31), a drilling mechanism I and a hydraulic cutting mechanism, wherein the fluid control mechanism I (31) is used for controlling the flowing direction of a pressure medium flowing through the coal mining directional drilling rod (2), the drilling mechanism I comprises a bendable shell I, a hole bottom screw motor I (32) and a directional drill bit I (33) arranged on the power output end of the hole bottom screw motor I (32) through a universal shaft assembly, a drilling nozzle I with the spraying direction facing the drilling direction is arranged on the directional drill bit I (33), the hydraulic cutting mechanism comprises a plurality of hydraulic cutting nozzles (34) with the spraying direction arranged along the radial direction of the directional drill bit I (33), the high-pressure input end of the hole bottom screw motor I (32) and the hydraulic cutting nozzles (34) are respectively connected with the fluid control mechanism I (31) in a sealing and communicating mode, the low-pressure output end of the hole bottom screw motor I (32) is connected with the drilling nozzle I in a sealing and communicating manner;

the directional drilling coal and rock mixture conveying part comprises a drilling and sucking directional drilling machine, a directional coal sucking drilling well (4), a coal sucking directional drilling rod (5) and a drilling and sucking integrated device (6); the drilling and sucking directional drilling machine is arranged on the ground; the directional coal-sucking drilling well (4) is driven from the ground relative to the low end position of the coal bed inclined trend, the directional coal-sucking drilling well (4) comprises a main coal-sucking drilling section (41) which moves up and down, a coal bed through drilling section (42) which moves in the width direction of the coal bed and a coal-sucking transition drilling section (43) which is obliquely communicated and arranged between the main coal-sucking drilling section (41) and the coal bed through drilling section (42), and the coal bed through drilling section (42) is positioned at the bottom of the low end position of the coal bed inclined trend; the coal-absorbing directional drilling rod (5) comprises a plurality of hollow drilling rod sections which are sealed and coaxially installed and connected into an integral structure, the top end of the coal-absorbing directional drilling rod (5) positioned at the wellhead of the directional coal-absorbing drilling well (4) is hermetically installed and connected with the output end of a high-pressure water injection pipe, the input end of the high-pressure water injection pipe is hermetically communicated and connected with a water storage tank through a high-pressure water injection pump, a coherent pressure medium channel is formed in a cavity inside the coal-absorbing directional drilling rod (5), and the pressure medium channel comprises a pressure water injection channel and a coal-absorbing channel; the drilling and sucking integrated device (6) comprises a fluid control mechanism II (61), a drilling mechanism II arranged at the bottom end of the coal-sucking directional drill rod (5) and a coal-sucking mechanism arranged on the coal-sucking directional drill rod (5), wherein the fluid control mechanism II (61) is used for controlling the flowing direction of a pressure medium flowing through the coal-sucking directional drill rod (5), the drilling mechanism II comprises an adjustable bent shell II, a hole bottom screw motor II (62) and a directional drill bit II (63) arranged on the power output end of the hole bottom screw motor II (62) through a universal shaft assembly, a drilling nozzle II with the spraying direction facing the drilling direction is arranged on the directional drill bit II (63), the high-pressure input end of the hole bottom screw motor II (62) is connected with a pressure water injection channel through the fluid control mechanism II (61), the low-pressure output end of the hole bottom screw motor II (62) is connected with the drilling nozzle II in a sealing and communicating manner, the coal suction mechanism comprises a plurality of slurry pumps (64) which are arranged on the coal suction directional drill rod (5) in series, the material input ends and the material output ends of the slurry pumps (64) are connected with coal suction channels in a sealing and communicated mode, the input ends of the coal suction channels are connected with the fluid control mechanism II (61), and the output ends of the coal suction channels are connected with a sedimentation tank on the ground.

2. The ground directional drilling fluidization hydraulic coal mining system according to claim 1, characterized in that the ground directional drilling fluidization hydraulic coal mining system further comprises a grouting filling part, the grouting filling part comprises a slurry stirring station arranged near the position of the drilling wellhead of the directional coal mining drilling well (1) and a grouting port (7) arranged on the fluid control mechanism I (31), the output end of the slurry stirring station is communicated and connected with the input end of a grouting pump, and the output end of the grouting pump is hermetically connected with the top end of a pressure medium channel of the coal mining directional drilling rod (2) during grouting filling operation.

3. The ground directional drilling fluidization hydraulic coal mining system according to claim 2, characterized in that the fluid control mechanism I (31) comprises a control valve group I (311) with a pressure water input end connected with the bottom end of a pressure medium channel of the coal mining directional drilling rod (2) in a sealing and communicating manner and a sliding sleeve (312) sleeved on a hollow drilling rod section at the bottom end of the coal mining directional drilling rod (2) in a sealing and sliding manner, a pressure water output end of the control valve group I (311) arranged behind the hole bottom screw motor I (32) along the drilling direction is connected with a high pressure input end of the hole bottom screw motor I (32) in a communicating manner, the sliding sleeve (312) arranged in a radial positioning manner relative to the hollow drilling rod section at the bottom end of the coal mining directional drilling rod (2) comprises a sliding driving mechanism, a plurality of hydraulic cutting nozzle mounting holes penetrating through the sliding sleeve (312) along the radial direction are arranged on the sliding sleeve (312) and are uniformly distributed along the circumferential direction of the sliding sleeve (312), the hydraulic cutting nozzles (34) are installed in the hydraulic cutting nozzle installation holes, the grouting ports (7) which are arranged in number corresponding to the hydraulic cutting nozzle installation holes are arranged on the hollow drill rod section at the bottom end of the coal mining directional drill rod (2) in a penetrating mode in the radial direction, the grouting ports (7) are matched with the sliding stroke of the sliding sleeve (312) and are arranged corresponding to the positions of the hydraulic cutting nozzle installation holes, and the sliding sleeve (312) can slide back and forth on the hollow drill rod section at the bottom end of the coal mining directional drill rod (2) in the axial direction and can be positioned by controlling the action of the sliding driving mechanism, so that the hydraulic cutting nozzles (34) are in a penetrating state or a staggered plugging state with the grouting ports (7).

4. The ground directional drilling fluidized hydraulic coal mining system according to claim 2, characterized in that the hydraulic cutting nozzles (34) are arranged on the directional drill bit I (33), and a plurality of hydraulic cutting nozzles (34) are uniformly distributed along the circumferential direction of the directional drill bit I (33); the fluid control mechanism I (31) comprises a control valve group I (311) with a pressure water input end connected with the bottom end of a pressure medium channel of the coal mining directional drilling rod (2) in a sealing and communicating manner and a sliding sleeve (312) sleeved on a hollow drilling rod section at the bottom end of the coal mining directional drilling rod (2) in a sealing and sliding fit manner, the pressure water output end of the control valve group I (311) arranged behind the hole bottom screw motor I (32) along the drilling direction comprises a drilling pressure water output end and a hydraulic cutting pressure water output end, the drilling pressure water output end is connected with a high-pressure input end of the hole bottom screw motor I (32) through a throttling control valve in a communicating manner, the hydraulic cutting pressure water output end is connected with a hydraulic cutting nozzle (34) through a sliding ring structure, the sliding sleeve (312) comprises a sliding driving mechanism, and a grouting port (7) is arranged on the hollow drilling rod section at the bottom end of the coal mining directional drilling rod (2) along the radial direction in a communicating manner, and the slip stroke setting of slip cover (312) is cooperated to grouting mouth (7), can realize that slip cover (312) slips and positions along axial direction on the hollow drilling rod section of coal mining directional drilling rod (2) bottom front and back through the action of control slip actuating mechanism, make grouting mouth (7) in the state of being through-going with the external world or the state of shutoff.

5. The ground directional drilling fluidized hydraulic coal mining system according to claim 1, characterized in that the ground directional drilling fluidized hydraulic coal mining system further comprises a gas extraction part, and the gas extraction part comprises a gas extraction pump arranged near a drilling wellhead of the directional coal mining well (1); during gas extraction operation, after slurry in a gap between a drill hole and the coal mining directional drill rod (2) is emptied, the output end of a gas extraction pump is connected with a gas extraction inclined hole which is arranged at the top of the main coal mining drill section (11) in a penetrating manner to extract gas; or during gas extraction operation, after water in the pressure medium channel of the coal mining directional drilling rod (2) is drained, the output end of the gas extraction pump is connected with the pressure medium channel of the coal mining directional drilling rod (2) to extract gas.

6. The ground directional drilling fluidized hydraulic coal mining system according to claim 1, characterized in that the pressure water injection channel and the coal suction channel of the coal suction directional drilling rod (5) are the same pressure medium channel, the slurry pump (64) is of a screw type submersible slurry pump structure, and the material input end facing the drilling direction and the material output end facing away from the drilling direction of the slurry pump (64) are coaxially arranged with the hollow drilling rod section of the coal suction directional drilling rod (5); the fluid control mechanism II (61) comprises a control valve group II (611) arranged behind the hole bottom screw motor II (62) along the drilling direction, a medium circulation port I of the control valve group II (611) facing away from the drilling direction is in closed communication connection with the bottom end of a pressure medium channel of the coal-absorbing directional drill rod (5), and a medium circulation port II of the control valve group II (611) facing towards the drilling direction comprises a coal-absorbing port and a pressure water output port in communication connection with a high-pressure input end of the hole bottom screw motor II (62).

7. The ground directional drilling fluidized hydraulic coal mining system according to claim 1, wherein the coal-sucking directional drilling rod (5) is a casing structure at least comprising an inner pipe and an outer pipe which are coaxially arranged, the hollow inner cavity of the inner pipe is a pressure water injection passage, the cavity between the outer pipe and the inner pipe is a coal-sucking passage, the slurry pump (64) is an axial flow type submersible slurry pump structure which is coaxially arranged with the hollow drilling rod section of the coal-sucking directional drilling rod (5) and has a cavity structure at an axial center position, the slurry pump (64) comprises a hollow shaft driving motor and a hollow shaft impeller which are coaxially arranged and in transmission connection, the outer diameter size of the hollow shaft driving motor is smaller than the inner diameter size of the outer pipe of the coal-sucking directional drilling rod (5), the outer diameter size of the hollow shaft impeller is in clearance fit with the inner diameter size of the outer pipe of the coal-sucking directional drilling rod (5), and the slurry pump (64) is coaxially mounted in the coal-sucking directional drilling rod (5) through a support frame, An inner pipe of the coal-absorbing directional drill rod (5) is positioned and penetrated in a cavity at the axle center of the slurry pump (64), and a communicated coal-absorbing channel is formed between an outer pipe and the inner pipe of the coal-absorbing directional drill rod (5); the fluid control mechanism II (61) comprises a control valve group II (611) arranged behind the hole bottom screw motor II (62) along the drilling direction, a medium circulation port I of the control valve group II (611) facing away from the drilling direction comprises a coal circulation port communicated with a coal suction channel of the coal suction directional drill rod (5) and a pressure water injection port communicated with a pressure water injection channel of the coal suction directional drill rod (5), the medium circulation port II of the control valve group II (611) facing the drilling direction comprises a coal suction port communicated with the coal circulation port and a pressure water output port communicated with the pressure water injection port, and the pressure water output port is communicated and connected with a high-pressure input end of the hole bottom screw motor II (62).

8. The ground directional drilling fluidization hydraulic coal mining system according to claim 1, wherein a telescopic isolation sleeve (612) extending towards a drilling direction is arranged on the fluid control mechanism II (61), the inner diameter of the telescopic isolation sleeve (612) is matched with the swing azimuth track circle of the directional drill bit II (63) when the adjustable bending shell II is at the maximum bending angle, one end, away from the drilling direction, of the telescopic isolation sleeve (612) of the telescopic driving mechanism is integrally connected with the fluid control mechanism II (61) in a sealing mode, and a coal-rock mixture flow channel is formed in a space between the inner surface of the telescopic isolation sleeve (612) and the outer surface of the hole bottom screw motor II (62).

9. The above-ground directional drilling fluidized hydraulic coal mining system according to claim 8, characterized in that the inner surface of the telescopic isolation sleeve (612) and/or the outer surface of the hole bottom screw motor II (62) is provided with a convexly arranged crushing structure comprising cutting teeth.

10. The above-ground directional drilling fluidized hydraulic coal mining system according to claim 8, wherein the directional drill bit II (63) comprises a large-diameter section facing the drilling direction and a small-diameter section facing away from the drilling direction, and the outer surface of the small-diameter section is provided with a convexly-arranged crushing structure comprising cutting teeth.