A method for directional drilling and crushing fault rock mass in coal mining working face

Abstract

The present invention discloses a method for directional drilling and crushing of fault rock mass in a coal mining working face, comprising: step 1. controlling a coal mining drill to perform directional drilling on a coal seam, rotating the drill to the fault rock mass, so that an operating hole is formed in the coal seam; step 2. moving the drill bit and drill rod of the coal mining drill out of the operating hole, and recording the drilling depth; step 3. placing an external expansion type fracturing device in the operating hole, and controlling a winch to gradually unwind a traction pipe connected to the external expansion type fracturing device; step 4. controlling the external expansion type fracturing device to expand on the inner wall of the operating hole, and controlling the external expansion type fracturing device to move along the operating hole to the fault rock mass; step 5. passing a high-pressure medium into the external expansion type fracturing device, and the high-pressure medium acts on the inner wall of the operating hole by the external expansion type fracturing device to fractur the fault rock mass. The present invention can effectively crush the fault rock mass, avoid damage to the coal mining drill, and improve the efficiency of coal mining. The present invention is applicable to the technical field of coal mining.

Description

Technical Field

[0001] The invention belongs to the technical field of coal mining, and in particular relates to a method for directional drilling and crushing fault rock masses in a coal mining working face. Background Art

[0002] At present, most coal is formed below the ground. Due to the difference in the underground soil matrix, the coal seam is in a complex underground environment, which makes coal mining more difficult. Especially when the coal mining face is at the fault rock mass, the existing coal mining method is to use a coal mining drill to continuously mine coal; however, during the mining process, the drill bit of the coal mining drill advances to the fault rock mass and is blocked by the fault rock mass, and the fault rock mass cannot be effectively broken, which not only damages the coal mining drill, but also greatly reduces the efficiency of coal mining. Therefore, there is an urgent need for a method for breaking the fault rock mass of the coal mining face, which can effectively break the fault rock mass, avoid damage to the coal mining drill, and improve the efficiency of coal mining. Summary of the invention

[0003] The invention provides a directional drilling and crushing method for fault rock mass in a coal mining working face, which is used for effectively crushing the fault rock mass, avoiding damage to the coal mining drill, and improving the efficiency of coal mining.

[0004] To achieve the above purpose, the technical solution adopted by the present invention is as follows:

[0005] A method for directional drilling and crushing fault rock mass in a coal mining working face, comprising the following steps:

[0006] Step 1. Control the coal mining drill to perform directional drilling on the coal seam, and rotate the drill to the position of the fault rock mass, so that an operating hole is formed in the coal seam;

[0007] Step 2. Move the drill bit and drill rod of the coal mining drill out of the working hole and record the drilling depth;

[0008] Step 3. placing the external expansion fracturing device in the working hole, and controlling the winch to gradually unwind the traction pipe connected to the external expansion fracturing device;

[0009] Step 4. Control the external expansion type fracturing device to expand on the inner wall of the operation hole, and then control the external expansion type fracturing device to move along the operation hole to the fault rock mass;

[0010] Step 5. Pass the high-pressure medium into the external expansion type fracturing device, and the high-pressure medium acts on the inner wall of the working hole through the external expansion type fracturing device to fracture the fault rock mass.

[0011] Furthermore, in step 5, the external expansion fracturing device is controlled to perform intermittent fracturing along the extension direction of the working hole. After the fracturing is completed, the winch is controlled to reel in the traction tube. At the same time, the external expansion fracturing device is controlled to move outward along the extension direction of the working hole until the external expansion fracturing device leaves the working hole, and a coal mining drill is used to drill holes in other parts of the coal seam, and steps 1 to 5 are repeated.

[0012] Furthermore, the external expansion fracturing device includes an assembly seat connected to one end of the traction tube, and a plurality of traveling fracturing mechanisms are evenly installed on the assembly seat along its circumference. These traveling fracturing mechanisms are connected to an annular hose, and a transfer tube is connected to the annular hose.

[0013] Furthermore, the traveling fracturing mechanism includes a first piston rod whose one end is movably inserted into the driving cavity along the radial direction of the assembly seat, a first piston head is constructed at the end of the first piston rod, and a fracturing seat is connected to the end of the first piston rod away from the first piston head, a telescopic traveling unit is installed on the fracturing seat, an adapter seat is constructed on the assembly seat, a first hydraulic channel and a second hydraulic channel are constructed in the adapter seat, and a first hydraulic connector and a second hydraulic connector are constructed at the upper end of the adapter seat, the first hydraulic connector and the second hydraulic connector are respectively connected to the first hydraulic channel and the second hydraulic channel, and the first hydraulic channel and the second hydraulic channel are both connected to the driving cavity.

[0014] Furthermore, fracturing wings are symmetrically constructed on both sides of the fracturing seat, a first fracturing cavity is constructed in each of the fracturing wings, a plurality of first fracturing holes are opened on an end surface of an inner wall of the fracturing wing facing the operating hole, each of the first fracturing holes is connected to the first fracturing cavity, a connecting branch pipe connected to the first fracturing cavity is installed on the fracturing wing, and the connecting branch pipe is connected to the annular hose.

[0015] Furthermore, a mounting opening is constructed at a middle position of the fracturing seat, the telescopic traveling unit is installed at the mounting opening, and first sliding grooves are respectively constructed on both sides of the mounting opening, the telescopic traveling unit includes two sliding seats, the two sliding seats are respectively slidably connected in the two first sliding grooves, each of the sliding seats is connected to the fracturing seat through a first connecting spring, the first connecting spring is assembled in the first sliding groove, a traveling wheel is arranged between the two sliding seats, one axial end of the traveling wheel is slidably connected to the second sliding groove of one of the sliding seats through a sliding block, and the other axial end of the traveling wheel is slidably connected to the second sliding groove of the other sliding seat through a hydraulic motor, the sliding block and the hydraulic motor are respectively connected to the corresponding sliding seats through a second connecting spring, and the first sliding groove and the second sliding groove extend radially along the assembly seat.

[0016] Furthermore, a plug hole is constructed in the first piston rod, and a plurality of torsion grooves are evenly constructed in the plug hole along its circumference, a plug rod is constructed at one end of the fracturing seat close to the first piston rod, and a plurality of torsion bars are evenly constructed in the circumference of the plug rod, the plug rod is assembled in the plug hole and the torsion bar is movably assembled in the corresponding torsion groove, a third connecting spring is installed in the plug hole, and the two ends of the third connecting spring are respectively connected to the plug rod and the first piston rod, a conducting channel connected to the plug hole is constructed in the plug rod, and a conducting joint connected to the conducting channel is constructed on the fracturing seat.

[0017] Furthermore, before the external expansion fracturing device is placed into the operating hole, the percussion fracturing head is connected to the hydraulic reciprocating drive mechanism at the end of the external expansion fracturing device. When the percussion fracturing head abuts against the bottom of the operating hole, the percussion fracturing head is controlled to fractur the bottom of the hole, and then the hydraulic reciprocating drive mechanism is controlled to drive the percussion fracturing head to reciprocately knock on the bottom of the hole.

[0018] Furthermore, the hydraulic reciprocating drive mechanism includes an assembly sleeve constructed at one end of the external expansion type fracturing device away from the traction tube, a second piston rod is movably connected in the assembly sleeve, a second piston head is constructed on the second piston rod, the second piston head is connected to the corresponding end wall of the external expansion type fracturing device through a fourth connecting spring, the inner cavity of the assembly sleeve is divided into an upper chamber and a lower chamber by the second piston head, the upper chamber and the lower chamber are respectively connected to a third hydraulic channel and a fourth hydraulic channel, and the third hydraulic channel and the fourth hydraulic channel are both constructed in the external expansion type fracturing device.

[0019] Furthermore, a plug-in tube extending along its axis and inserted into the plug-in channel is constructed on the external expansion fracturing device, and the plug-in channel passes through the second piston rod and the second piston head along the axis of the second piston rod, and a fracturing channel connected to the plug-in tube is constructed in the external expansion fracturing device; the percussion fracturing head includes a percussion head body connected to the lower end of the second piston rod through a connecting joint, and a second fracturing chamber and a connecting channel are respectively constructed in the percussion head body and the connecting joint, and the second fracturing chamber is connected to the plug-in channel through the connecting channel, and a plurality of fracturing protrusions are constructed at intervals on the percussion head body, and a second fracturing hole connected to the second fracturing chamber is constructed on each of the fracturing protrusions.

[0020] Due to the adoption of the above structure, the technical progress achieved by the present invention compared with the prior art is that: the present invention uses a coal mining drill to drill the coal seam until it is rotary drilled to the fault rock mass to determine the position of the fault rock mass. Afterwards, the external expansion type fracturing device is lowered to the fault rock mass, and the external expansion type fracturing device is controlled to move in a straight line or a curved shape along the working hole, so that the external expansion type fracturing device moves to the predetermined position of the working hole, which is the fault rock mass. Then, the external expansion type fracturing device is controlled to expand outward to the inner wall of the working hole, so that the external expansion type fracturing device is fixed to the working hole, and a high-pressure medium is passed into the external expansion type fracturing device, and the working hole is fracturing by the external expansion type fracturing device. The general high-pressure medium is high-pressure water or high-pressure air; the high-pressure medium is pressed into the cracks of the fault rock mass, and the fault rock mass is gradually fractured. Thereby, the purpose of crushing the fault rock mass is achieved, and the obstacles that hinder the coal mining drill are removed. In summary, the present invention can effectively break up fault rock masses, avoid damage to coal mining drills, and improve the efficiency of coal mining. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The accompanying drawings are used to provide further understanding of the present invention and constitute a part of the specification. They are used to explain the present invention together with the embodiments of the present invention and do not constitute a limitation of the present invention.

[0022] In the attached picture:

[0023] Figure 1 It is a structural schematic diagram of the connection between the external expansion type fracturing device, the hydraulic reciprocating drive mechanism and the percussion fracturing head according to an embodiment of the present invention;

[0024] Figure 2 for Figure 1 A schematic diagram of another angle of the structure shown;

[0025] Figure 3 for Figure 1 a top view of the structure shown;

[0026] Figure 4 for Figure 1 an axial cross-sectional view of the structure shown;

[0027] Figure 5 for Figure 4 A magnified view of the structure of the middle A part;

[0028] Figure 6 for Figure 4 A magnified view of the structure of the middle B area;

[0029] Figure 7 for Figure 1 A partial cross-sectional view of the structure shown;

[0030] Figure 8 for Figure 7A magnified view of the structure of the middle C part;

[0031] Fig. 9 It is a structural schematic diagram of a traveling fracturing mechanism in an external expansion fracturing device according to an embodiment of the present invention;

[0032] Fig.10 An exploded view of a traveling fracturing mechanism in an external expansion fracturing device according to an embodiment of the present invention;

[0033] Fig.11 It is a schematic diagram of the partially disassembled structure of another traveling type fracturing mechanism in the external expansion type fracturing device according to an embodiment of the present invention.

[0034] Labeled parts: 100-assembly seat, 101-seat body, 102-adapter seat, 103-driving chamber, 104-first hydraulic channel, 105-first hydraulic joint, 106-second hydraulic channel, 107-second hydraulic joint, 108-fracturing channel, 109-fracturing joint, 110-third hydraulic channel A, 111-third hydraulic joint, 112-first pipe body, 113-third hydraulic channel B, 114-second pipe body, 1 15-fourth hydraulic channel A, 116-fourth hydraulic joint, 117-third pipe body, 118-fourth hydraulic channel B, 119-fourth pipe body, 200-traveling fracturing mechanism, 201-first piston rod, 202-first piston head, 203-fracturing seat, 204-fracturing wing, 205-first fracturing hole, 206-installation port, 207-first sliding groove, 208-sliding seat, 209-first connecting spring, 210-first Second sliding groove, 211-second connecting spring, 212-hydraulic motor, 213-output shaft, 214-traveling wheel, 215-plug hole, 216-torsion groove, 217-plug rod, 218-torsion bar, 219-third connecting spring, 220-connecting bolt, 221-conducting joint, 300-hydraulic reciprocating drive mechanism, 301-assembly set, 302-plug tube, 303-second piston rod, 304-plug channel, 30 5-second piston head, 306-fourth connecting spring, 307-upper chamber, 308-lower chamber, 400-percussion fracturing head, 401-percussion head body, 402-connecting joint, 403-second fracturing chamber, 404-connecting channel, 405-fracturing protrusion, 406-second fracturing hole, 500-annular hose, 501-adapter tube, 502-connector tube, 503-connecting branch pipe, 600-traction tube, 601-adapter. DETAILED DESCRIPTION

[0035] The preferred embodiments of the present invention are described below in conjunction with the accompanying drawings. It should be understood that the preferred embodiments described herein are only used to illustrate and explain the present invention, and are not used to limit the present invention.

[0036] The present invention discloses a method for directional drilling and crushing fault rock mass in a coal mining working face, such as Figure 1-11 As shown, the following steps are included:

[0037] Step 1. Control the coal mining drill to perform directional drilling on the coal seam, and rotate the drill to the position of the fault rock mass, so that an operating hole is formed in the coal seam;

[0038] Step 2. Move the drill bit and drill rod of the coal mining drill out of the working hole and record the drilling depth;

[0039] Step 3. Place the external expansion fracturing device in the working hole, and control the winch to gradually unwind the traction pipe 600 connected to the external expansion fracturing device;

[0040] Step 4. Control the external expansion type fracturing device to expand on the inner wall of the operation hole, and then control the external expansion type fracturing device to move along the operation hole to the fault rock mass;

[0041] Step 5. Pass the high-pressure medium into the external expansion type fracturing device, and the high-pressure medium acts on the inner wall of the working hole through the external expansion type fracturing device to fracture the fault rock mass.

[0042] The working principle and advantages of the present invention are as follows: the present invention uses a coal mining drill to drill into the coal seam until it is rotary drilled to the fault rock mass, and the position of the fault rock mass is determined. Afterwards, the external expansion type fracturing device is lowered to the fault rock mass, and the external expansion type fracturing device is controlled to move in a straight line or a curved shape along the working hole, so that the external expansion type fracturing device moves to the predetermined position of the working hole, which is the fault rock mass. Then, the external expansion type fracturing device is controlled to expand outward to the inner wall of the working hole, so that the external expansion type fracturing device is fixed to the working hole, and a high-pressure medium is passed into the external expansion type fracturing device, and the working hole is fracturing by the external expansion type fracturing device. The general high-pressure medium is high-pressure water or high-pressure air; the high-pressure medium is pressed into the cracks of the fault rock mass, and the fault rock mass is gradually fractured. Thereby, the purpose of crushing the fault rock mass is achieved, and the obstacles that hinder the coal mining drill are removed. In summary, the present invention can effectively break up fault rock masses, avoid damage to coal mining drills, and improve the efficiency of coal mining.

[0043] As a preferred embodiment of the present invention, in step 5, the external expansion type fracturing device is controlled to perform interval fracturing along the extension direction of the working hole, and then the coal seam and fault rock mass are subjected to longitudinal multi-point fracturing, so as to facilitate the subsequent drilling operation of the coal mining drill and improve the drilling efficiency of the coal mining drilling. After the fracturing is completed, the winch is controlled to reel the traction tube 600, and at the same time, the external expansion type fracturing device is controlled to move outward along the extension direction of the working hole until the external expansion type fracturing device leaves the working hole. Then, the coal mining drill is used to drill holes in other parts of the coal seam, and steps 1 to 5 are repeated, thereby achieving the purpose of crushing the fault rock mass at different depths of the coal seam.

[0044] As a preferred embodiment of the present invention, Figure 1-4 As shown, the external expansion type fracturing device includes an assembly seat 100 and a plurality of traveling type fracturing mechanisms 200. The assembly seat 100 is connected to a transfer joint 601 at one end of a traction tube 600, and the plurality of traveling type fracturing mechanisms 200 are evenly installed on the assembly seat 100 along the circumference of the assembly seat 100. The traveling type fracturing mechanisms 200 are connected to an annular hose 500, and a transfer pipe 501 is connected to the annular hose 500. A medium channel is constructed in the assembly seat 100, and a joint pipe 502 is constructed on the assembly seat 100 and located at one end of the medium channel, and the other end of the medium channel is connected to the transfer pipe 501. The high pressure medium enters the annular hose 500 through the medium channel, and is evenly distributed to each traveling type fracturing mechanism 200 by the annular hose 500, and finally enters the fault rock mass by the traveling type fracturing mechanism 200. This embodiment can control the movement of one or more traveling fracturing mechanisms 200, so that the traveling fracturing mechanism 200 drives the assembly seat 100 to move in a straight line or curved shape, thereby achieving the purpose of moving along the extension direction of the straight or curved working hole, and ensuring that the assembly seat 100 can smoothly reach the position of the fault rock mass of the working hole to facilitate subsequent fracturing and crushing operations.

[0045] As a preferred embodiment of the present invention, Figure 3 , 4As shown in Figures 9 and 10, the traveling fracturing mechanism 200 includes a first piston rod 201, a first piston head 202, a fracturing seat 203 and a telescopic traveling unit. A driving chamber 103 is constructed in the assembly seat 100, one end of the first piston rod 201 is inserted into the driving chamber 103 along the radial direction of the assembly seat 100, the first piston head 202 is constructed at the end of the first piston rod 201, the fracturing seat 203 is connected to the end of the first piston rod 201 away from the first piston head 202, and the telescopic traveling unit is installed on the end of the fracturing seat 203 away from the first piston rod 201. The assembly seat 100 of this embodiment includes a seat body 101, and an adapter seat 102 is constructed at the upper end of the seat body 101. A first hydraulic channel 104 and a second hydraulic channel 106 are constructed in the adapter 102, and a first hydraulic connector 105 and a second hydraulic connector 107 are constructed at the upper end of the adapter 102. The first hydraulic connector 105 and the second hydraulic connector 107 are respectively connected to the first hydraulic channel 104 and the second hydraulic channel 106, and the first hydraulic channel 104 and the second hydraulic channel 106 are both connected to the drive chamber 103. In this embodiment, a telescopic spring is installed on the first piston head 202, and the telescopic spring is arranged in the drive chamber 103, and one end of the telescopic spring away from the first piston head 202 is fixed to the inner wall of the drive chamber 103, and the telescopic spring extends along the axial direction of the first piston rod 201. The working principle and advantages of this embodiment are as follows: this embodiment passes the driving medium (generally hydraulic oil) into the driving chamber 103. Under the drive of the driving medium, each first piston rod 201 moves radially outward along the assembly seat 100 until the telescopic running unit is elastically pressed on the inner wall of the operation hole; after that, the telescopic running unit is controlled to move along the extension direction of the operation hole until it reaches the predetermined position. Then, the driving medium is continued to be passed into the driving chamber 103, so that the fracturing seat 203 gradually moves toward the inner wall of the operation hole until the fracturing seat 203 is tightly pressed on the inner wall of the operation hole. At this time, the telescopic running unit is compressed by the inner wall of the operation hole and elastically shrinks in the fracturing seat 203; then the high-pressure medium is passed into the fracturing seat 203, and then the fracturing operation is performed. After the fracturing operation is completed, the driving medium in the driving chamber 103 is discharged, the pressure of the fracturing seat 203 on the inner wall of the working hole is released, and under the action of the telescopic spring, the fracturing seat 203 gradually retracts with the first piston rod 201, and the telescopic running unit is in a state of full contact with the inner wall of the working hole. In this way, the telescopic running unit is controlled to move so that it drives the assembly seat 100 to move along the working hole, so that the assembly seat 100 continues to extend into the working hole or leaves the working hole. In this embodiment, the length of the first piston rod 201 extending out of the driving chamber 103 can be adjusted by adjusting the pressure of the driving medium introduced into the driving chamber 103, thereby realizing that the telescopic running unit can adapt to working holes of different apertures.

[0046] As a preferred embodiment of the present invention, Fig. 9 As shown, fracturing wings 204 are symmetrically constructed on both sides of the fracturing seat 203, a first fracturing cavity is constructed in each fracturing wing 204, a plurality of first fracturing holes 205 are opened on one end surface of the inner wall of the fracturing wing 204 facing the working hole, each first fracturing hole 205 is connected to the first fracturing cavity, a connecting branch pipe 503 connected to the first fracturing cavity is installed on the fracturing wing 204, and the connecting branch pipe 503 is connected to the annular hose 500. The fracturing wings 204 of this embodiment are tightly pressed on the inner wall of the working hole, and the fracturing wings 204 are located at the fault rock mass, and then, by passing a high-pressure medium into the fracturing cavity, the high-pressure medium is ejected through the first fracturing holes 205 and the fault rock mass is fractured.

[0047] As a preferred embodiment of the present invention, Fig.10 As shown, a mounting opening 206 is configured at the middle position of the fracturing seat 203, the telescopic running unit is installed at the mounting opening 206, and first sliding grooves 207 are configured on both sides of the mounting opening 206. The telescopic running unit of this embodiment includes a running wheel 214, a sliding block, a hydraulic motor 212 and two sliding seats 208. Among them, the two sliding seats 208 are respectively slidably connected in the two first sliding grooves 207, each sliding seat 208 is connected to the fracturing seat 203 through a first connecting spring 209, and the first connecting spring 209 is assembled in the first sliding groove 207. The running wheel 214 is arranged between the two sliding seats 208, and one axial end of the running wheel 214 is rotatably connected to the sliding block through a connecting shaft, and the sliding block is slidably connected to the second sliding groove 210 of one of the sliding seats 208, and the other axial end of the running wheel 214 is coaxially connected to the output shaft 213 of the hydraulic motor 212, and the hydraulic motor 212 is slidably connected to the second sliding groove 210 of the other sliding seat 208, the sliding block and the hydraulic motor 212 are respectively connected to the corresponding sliding seats 208 through the second connecting spring 211, and the first sliding groove 207 and the second sliding groove 210 extend along the radial direction of the assembly seat 100. The working principle and advantages of this embodiment are: this embodiment realizes the purpose of multi-stage telescopic travel unit through the first connecting spring 209 and the second connecting spring 211. When the telescopic travel unit moves in the working hole, it ensures that the fracturing seat 203 maintains a certain distance from the inner wall of the working hole; when the fracturing seat 203 is tightened in the working hole, the running wheel 214 is fully extended into the installation opening 206. Moreover, when the hydraulic motor 212 is controlled to operate, the hydraulic motor 212 drives the running wheel 214 to rotate, so that the running wheel 214 moves on the inner wall of the working hole. Since the telescopic travel unit of this embodiment adopts a multi-stage telescopic structure, it has better obstacle crossing ability when moving in the working hole.

[0048] As a preferred embodiment of the present invention, Fig.11As shown, a plug hole 215 is constructed in the first piston rod 201, and a plurality of torsion grooves 216 are uniformly constructed in the plug hole 215 along its circumference. A plug rod 217 is constructed at one end of the fracturing seat 203 close to the first piston rod 201, and a plurality of torsion bars 218 are uniformly constructed in the circumference of the plug rod 217. The plug rod 217 is assembled in the plug hole 215, and the torsion bars 218 are movably assembled in the corresponding torsion grooves 216. A third connecting spring 219 is installed in the plug hole 215, and the two ends of the third connecting spring 219 are respectively connected to the plug rod 217 and the first piston rod 201. A spring seat is constructed at one end of the third connecting spring 219 close to the first piston head 202, and a connecting bolt 220 is detachably connected to the outer end of the first piston head 202, and the connecting bolt 220 is connected to the spring seat. In this embodiment, a conducting channel connected to the plug hole 215 is constructed in the plug rod 217, and a conducting joint 221 connected to the conducting channel is constructed on the fracturing seat 203. The working principle and advantage of this embodiment are: in this embodiment, the driving medium is passed into the conducting channel through the conducting joint 221, and then enters the plug hole 215, so that the driving medium drives the plug rod 217 to move toward the inner wall of the working hole. In this process, under the action of the torsion groove 216 and the torsion bar 218, the plug rod 217 drives the fracturing seat 203 to twist a certain angle, thereby causing the running wheel 214 to deflect a certain angle. Driven by the hydraulic motor 212, the running wheel 214 tilts and rotates downward. Under the synchronous action of multiple running wheels 214, the external expansion fracturing device spirally moves downward to ensure the purpose of stable movement on the irregular working hole surface. It avoids the running wheel 214 from shaking, tilting or getting stuck when encountering a large depression or protrusion when moving along the length direction of the working hole.

[0049] As a preferred embodiment of the present invention, Figure 4-8As shown, before the external expansion type fracturing device is placed in the working hole, the percussion fracturing head 400 is connected to the hydraulic reciprocating drive mechanism 300 at the end of the external expansion type fracturing device. When the percussion fracturing head 400 abuts against the bottom of the working hole, the percussion fracturing head 400 is controlled to perform fracturing on the bottom of the hole, and then the hydraulic reciprocating drive mechanism 300 is controlled to drive the percussion fracturing head 400 to reciprocately percuss the bottom of the hole. Thus, the purpose of crushing and fracturing the fault rock mass at the bottom of the hole is achieved, which is convenient for the subsequent use of the drill bit of the coal mining rig to break through the fault rock mass from the fracturing location. The specific structure of the hydraulic reciprocating drive mechanism 300 of this embodiment is that the hydraulic reciprocating drive mechanism 300 includes an assembly set 301, a second piston rod 303, a second piston head 305 and a fourth connecting spring 306. Among them, the assembly sleeve 301 is constructed on the end face of the external expansion type fracturing device away from the traction tube 600, the upper end of the second piston rod 303 is movably connected in the assembly sleeve 301, and the second piston head 305 is constructed at the upper end of the second piston rod 303. The second piston head 305 is connected to the corresponding end wall of the external expansion type fracturing device through the fourth connecting spring 306. The inner cavity of the assembly sleeve 301 is divided into an upper chamber 307 and a lower chamber 308 by the second piston head 305. The upper chamber 307 and the lower chamber 308 are respectively connected to the third hydraulic channel and the fourth hydraulic channel, and the third hydraulic channel and the fourth hydraulic channel are both constructed in the external expansion type fracturing device. Specifically, the third hydraulic channel includes a third hydraulic channel A110 and a third hydraulic channel B113, and the fourth hydraulic channel includes a fourth hydraulic channel A115 and a fourth hydraulic channel B118; the third hydraulic channel A110 and the fourth hydraulic channel A115 are respectively constructed in the adapter 102, and a third hydraulic connector 111 and a fourth hydraulic connector 116 are constructed at the upper end of the adapter 102, and the third hydraulic connector 111 and the fourth hydraulic connector 116 are respectively connected to the upper end of the third hydraulic channel A110 and the upper end of the fourth hydraulic channel A115; the third hydraulic channel A110 and the fourth hydraulic channel A115 are respectively connected to the upper end of the third hydraulic channel A110 and the upper end of the fourth hydraulic channel A115; Channel B113 and the fourth hydraulic channel B118 are both constructed in the seat body 101. The third hydraulic channel B113 and the fourth hydraulic channel B118 are respectively connected to the first tube body 112 and the third tube body 117, and the first tube body 112 and the third tube body 117 are respectively connected to the third hydraulic channel A110 and the fourth hydraulic channel A115; the third hydraulic channel B113 and the fourth hydraulic channel B118 are respectively connected to the second tube body 114 and the fourth tube body 119, and the second tube body 114 and the fourth tube body 119 are respectively connected to the upper chamber 307 and the lower chamber 308.In this embodiment, a plug-in tube 302 is constructed on the external expansion type fracturing device, and the plug-in tube 302 extends along the axis of the assembly seat 100 and is inserted into the plug-in channel 304. The plug-in channel 304 passes through the second piston rod 303 and the second piston head 305 along the axis of the second piston rod 303. A fracturing channel 108 connected to the plug-in tube 302 is constructed in the external expansion type fracturing device. The fracturing channel 108 passes through the assembly seat 100 and the adapter seat 102. A fracturing joint 109 is constructed on the adapter seat 102, and the fracturing joint 109 is connected to the upper end of the fracturing channel 108. The percussion fracturing head 400 of the present embodiment includes a percussion head body 401, at the upper end of which a connecting joint 402 is constructed, the upper end of which is detachably connected to the lower end of the second piston rod 303, a second fracturing chamber 403 and a connecting channel 404 are respectively constructed in the percussion head body 401 and the connecting joint 402, the second fracturing chamber 403 is connected to the plug-in channel 304 through the connecting channel 404, a plurality of fracturing protrusions 405 are constructed at intervals on the percussion head body 401, and a second fracturing hole 406 connected to the second fracturing chamber 403 is constructed on each fracturing protrusion 405. The working principle and advantages of this embodiment are: this embodiment intermittently passes the driving medium into the upper chamber 307 and then discharges the upper chamber 307, and the synchronous driving medium is discharged from the lower chamber 308 and then enters the lower chamber 308, so that the driving medium drives the second piston rod 303 to reciprocate, so that the second piston rod 303 drives the knocking head body 401 to reciprocate and knock the bottom of the working hole, so as to achieve the purpose of breaking the fault rock mass at the bottom of the hole. And when the knocking head body 401 abuts against the bottom of the working hole, the high-pressure medium is passed into the fracturing channel 108 through the fracturing joint 109, and the high-pressure medium enters the second fracturing chamber 403, and finally flows out through the second fracturing hole 406 through the fracturing protrusion 405, and enters the cracks of the fault rock mass, so as to achieve the purpose of fracturing the fault rock mass.

[0050] Finally, it should be noted that the above is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or replace some of the technical features therein with equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the scope of protection of the claims of the present invention.

Claims

1. A method for directional drilling and crushing fault rock mass at a coal mining face, characterized in that: The steps include: Step 1. Control the coal mining drill to perform directional drilling on the coal seam, and rotate the drill to the position of the fault rock mass, so that an operating hole is formed in the coal seam; Step 2. Move the drill bit and drill rod of the coal mining drill out of the working hole and record the drilling depth; Step 3. placing the external expansion fracturing device in the working hole, and controlling the winch to gradually unwind the traction pipe connected to the external expansion fracturing device; Step 4. Control the external expansion type fracturing device to expand on the inner wall of the operation hole, and then control the external expansion type fracturing device to move along the operation hole to the fault rock mass; Step 5. Passing a high-pressure medium into the external expansion type fracturing device, the high-pressure medium acts on the inner wall of the working hole through the external expansion type fracturing device, and fracturing the fault rock mass; The external expansion type fracturing device comprises an assembly seat connected to one end of the traction tube, on which a plurality of traveling type fracturing mechanisms are evenly installed along the circumference thereof, and these traveling type fracturing mechanisms are connected to an annular hose, and a transfer tube is connected to the annular hose; The traveling fracturing mechanism comprises a first piston rod whose one end is movably inserted into a driving cavity along the radial direction of an assembly seat, a first piston head is constructed at the end of the first piston rod, a fracturing seat is connected to the end of the first piston rod away from the first piston head, a telescopic traveling unit is installed on the fracturing seat, an adapter seat is constructed on the assembly seat, a first hydraulic channel and a second hydraulic channel are constructed in the adapter seat, a first hydraulic joint and a second hydraulic joint are constructed at the upper end of the adapter seat, the first hydraulic joint and the second hydraulic joint are respectively connected to the first hydraulic channel and the second hydraulic channel, and the first hydraulic channel and the second hydraulic channel are both connected to the driving cavity.

2. A method for directional drilling and crushing fault rock mass in a coal mining face according to claim 1, characterized in that: In step 5, the external expansion fracturing device is controlled to perform intermittent fracturing along the extension direction of the operating hole. After the fracturing is completed, the winch is controlled to reel in the traction tube. At the same time, the external expansion fracturing device is controlled to move outward along the extension direction of the operating hole until the external expansion fracturing device leaves the operating hole, and a coal mining drill is used to drill holes in other parts of the coal seam, and steps 1 to 5 are repeated.

3. A method for directional drilling and crushing fault rock mass in a coal mining face according to claim 1, characterized in that: Fracturing wings are symmetrically constructed on both sides of the fracturing seat, a first fracturing cavity is constructed in each of the fracturing wings, a plurality of first fracturing holes are opened on an end surface of an inner wall of the fracturing wing facing the working hole, each of the first fracturing holes is connected to the first fracturing cavity, a connecting branch pipe connected to the first fracturing cavity is installed on the fracturing wing, and the connecting branch pipe is connected to the annular hose.

4. A method for directional drilling and crushing fault rock mass in a coal mining face according to claim 1, characterized in that: A mounting opening is constructed at the middle position of the fracturing seat, the telescopic running unit is installed at the mounting opening, and first sliding grooves are respectively constructed on both sides of the mounting opening, the telescopic running unit includes two sliding seats, the two sliding seats are respectively slidably connected in the two first sliding grooves, each of the sliding seats is connected to the fracturing seat through a first connecting spring, the first connecting spring is assembled in the first sliding groove, a running wheel is arranged between the two sliding seats, one axial end of the running wheel is slidably connected to the second sliding groove of one of the sliding seats through a sliding block, and the other axial end of the running wheel is slidably connected to the second sliding groove of the other sliding seat through a hydraulic motor, the sliding block and the hydraulic motor are respectively connected to the corresponding sliding seats through a second connecting spring, and the first sliding groove and the second sliding groove extend radially along the assembly seat.

5. A method for directional drilling and crushing fault rock mass in a coal mining face according to claim 1, characterized in that: A plug hole is constructed in the first piston rod, and a plurality of torsion grooves are evenly constructed in the plug hole along its circumference. A plug rod is constructed at one end of the fracturing seat close to the first piston rod, and a plurality of torsion bars are evenly constructed in the circumference of the plug rod. The plug rod is assembled in the plug hole and the torsion bar is movably assembled in the corresponding torsion groove. A third connecting spring is installed in the plug hole, and the two ends of the third connecting spring are respectively connected to the plug rod and the first piston rod. A conducting channel connected to the plug hole is constructed in the plug rod, and a conducting joint connected to the conducting channel is constructed on the fracturing seat.

6. A method for directional drilling and crushing fault rock mass in a coal mining face according to claim 1, characterized in that: Before the external expansion fracturing device is placed under the operating hole, the percussion fracturing head is connected to the hydraulic reciprocating drive mechanism at the end of the external expansion fracturing device. When the percussion fracturing head abuts against the bottom of the operating hole, the percussion fracturing head is controlled to fractur the bottom of the hole, and then the hydraulic reciprocating drive mechanism is controlled to drive the percussion fracturing head to reciprocately knock on the bottom of the hole.

7. A method for directional drilling and crushing fault rock mass in a coal mining face according to claim 6, characterized in that: The hydraulic reciprocating drive mechanism includes an assembly sleeve constructed at one end of the external expansion type fracturing device away from the traction tube, a second piston rod is movably connected in the assembly sleeve, a second piston head is constructed on the second piston rod, the second piston head is connected to the corresponding end wall of the external expansion type fracturing device through a fourth connecting spring, the inner cavity of the assembly sleeve is divided into an upper chamber and a lower chamber by the second piston head, the upper chamber and the lower chamber are respectively connected to a third hydraulic channel and a fourth hydraulic channel, and the third hydraulic channel and the fourth hydraulic channel are both constructed in the external expansion type fracturing device.

8. A method for directional drilling and crushing fault rock mass in a coal mining face according to claim 7, characterized in that: A plug-in tube extending along its axis and inserted into the plug-in channel is constructed on the external expansion fracturing device, and the plug-in channel passes through the second piston rod and the second piston head along the axis of the second piston rod. A fracturing channel connected to the plug-in tube is constructed in the external expansion fracturing device; the knocking fracturing head includes a knocking head body connected to the lower end of the second piston rod through a connecting joint, and a second fracturing chamber and a connecting channel are respectively constructed in the knocking head body and the connecting joint. The second fracturing chamber is connected to the plug-in channel through the connecting channel, and a plurality of fracturing protrusions are constructed at intervals on the knocking head body, and a second fracturing hole connected to the second fracturing chamber is constructed on each of the fracturing protrusions.

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