High-pressure gas continuous circulation device for coal mine underground directional hole drilling and operation method

Abstract

The invention provides a high-pressure gas continuous circulation device for coal mine underground directional hole drilling and an operation method. The device comprises an air compressor, a drilling machine power device, an air supply device, a drill rod clamping device, a high-pressure gas circulation device, a drill rod, a strong blowing short section, an air screw motor and a drill bit. Wherein the front connector of the strong blowing short section can extend out relative to the rear connector and expose the spraying hole, and compressed air is sprayed out from the spraying hole in the front connector, so that the slag and water discharging capability is enhanced. In the drilling process, when a previous drill rod completes drilling and a new drill rod needs to be connected, high-pressure gas circulation is kept through the high-pressure gas circulation device, disturbance to the hole wall is reduced, air supply, slag and water discharging are continuously maintained, the risks of drill jamming and air compressor building are reduced, the time for additionally connecting the drill rod to rebuild pressure is shortened, and the drilling efficiency is improved.

Description

Technical Field

[0001] The invention relates to the technical field of directional hole drilling in coal mines, and in particular to a high-pressure gas continuous circulation device and an operation method for directional hole drilling in coal mines. Background Art

[0002] The pneumatic directional drilling technology with pneumatic screw motor and electromagnetic wave measurement while drilling system as the core drilling tools has little disturbance to the hole wall and high hole success rate. It is increasingly used in the drilling construction of gas extraction holes in broken and soft coal seams in underground coal mines.

[0003] However, when adding drill pipes, the air supply needs to be stopped, causing gas pressure fluctuations in the hole, disturbing the hole wall of the broken soft coal seam, and increasing the risk of hole wall collapse and block falling; and, when encountering broken formations, or formations with local water content, if the air supply is interrupted or the air supply volume and pressure are insufficient, it will be difficult to discharge the drill cuttings and water, causing the accumulation of rock cuttings and water, leading to increased risks of air compressor blockage, drill stuck and drill buried. Summary of the invention

[0004] The present invention provides a high-pressure gas continuous circulation device and an operating method for directional hole drilling in coal mines, so as to solve the problems of hole wall instability caused by discontinuous air supply when adding drill rods in the prior art, and the risk of drill sticking caused by poor slag discharge.

[0005] In order to solve the above problems, according to one aspect of the present invention, the present invention provides a high-pressure gas continuous circulation device for directional hole drilling in coal mines, including an air compressor, a drilling rig power device, a blower, a drill rod holder, a high-pressure gas circulation device, a drill rod, a strong blowing short section, an air screw motor and a drill bit; wherein,

[0006] The air compressor is connected to the blower and the high-pressure gas circulation device respectively, and is used to transmit high-pressure gas to the two respectively;

[0007] The power head of the drilling rig power unit is connected to one end of the drill pipe to provide drilling power for the drill pipe;

[0008] The air supply device is connected to the inside of the drill pipe through the power head and is used to supply gas to the inside of the drill hole;

[0009] The drill rod clamp is installed at the opening of the drill hole to clamp the drill rod and is used in conjunction with the power head to achieve the clamping and unloading of the drill rod;

[0010] The high-pressure gas circulation device is arranged between the power head and the drill pipe clamp, which can hold the drill pipe tightly and deliver gas into the borehole when the drill pipe stops drilling;

[0011] The strong blowing short section is installed between the drill pipe and the air screw motor. The strong blowing short section includes a front joint and a rear joint that are movably connected. A drill bit is installed at the end of the air screw motor. When the drill cuttings increase or water comes out of the coal and rock strata during drilling, the power head pulls back the drill pipe, and the front joint of the strong blowing short section extends relative to the rear joint and exposes the injection hole. Compressed air is ejected from the injection hole on the front joint to enhance the ability of slag and water discharge.

[0012] Furthermore, the high-pressure gas circulation device comprises a first base and a second base of the same shape and size; the first base comprises an arc-shaped clamping plate, a fixing block is arranged at the middle of the outer side of the clamping plate; a first connecting plate is arranged on the upper wall of the fixing block, and a connecting hole is opened on the first connecting plate;

[0013] The first base and the second base can be assembled with each other and fixedly connected by the first connecting plate. When the first base and the second base are assembled, the space formed by the clamping plates of the first base and the second base can fix and clamp the drill rod.

[0014] Furthermore, the high-pressure gas circulation device also includes a shutoff ball valve, which is composed of two ball valve bodies of the same shape, and the middle part of the shutoff ball valve is through-set; gear shafts are set on opposite sides of the shutoff ball valve, and the central axis of the gear shaft is perpendicular to the central axis of the through-set area of ​​the shutoff ball valve;

[0015] A through mounting hole is provided on the first base, the mounting hole of the first base penetrates the clamping plate and the fixing block at the same time, and a ball valve body is sealed and installed in the mounting hole of the first base;

[0016] The fixed block is also provided with a vertically penetrating ball valve air inlet, the upper and lower ends of which can be connected to an external hydraulic device, and the ball valve air inlet is connected to the mounting hole of the first base;

[0017] A transmission rack capable of moving up and down is arranged in the air inlet of the ball valve, and when the intercepting ball valve is installed inside the mounting hole of the first base, the gear shaft of the intercepting ball valve is meshed with the transmission rack;

[0018] A transversely penetrating air supply port is provided on the side wall of the first base, and the air supply port does not contact the mounting hole of the first base;

[0019] An air supply pipeline is installed in the air supply port, and the first base is connected to the air compressor through the air supply pipeline.

[0020] Furthermore, the air compressor is connected to the air supply device and the high-pressure gas circulation device respectively through a hydraulically controlled reversing valve.

[0021] Furthermore, a sealing member is provided at the front end of the clamping plate, and the sealing member is in an arc shape matching the clamping plate; when the first base and the second base are assembled together, the two sealing members are assembled together and seal and clamp the drill rod.

[0022] Furthermore, the high-pressure gas continuous circulation device for directional hole drilling in coal mines also includes a base-controlled hydraulic valve, wherein:

[0023] A second connecting plate and a third connecting plate are disposed on the upper parts of the two clamping plates. The second connecting plate and the third connecting plate are respectively located on both sides of the fixing block. The second connecting plate and the third connecting plate are both provided with connecting holes.

[0024] A hydraulic hole is arranged on the outside of the seal; a mounting hole is arranged on the side wall of the fixed block, an opening and closing core shaft of the base is installed in the mounting hole of the fixed block, a hydraulic hole for the opening and closing core shaft is arranged on the upper wall of the fixed block, and the hydraulic hole for the opening and closing core shaft is connected to the mounting hole of the fixed block to connect to the opening and closing core shaft of the base to control the opening and closing of the high-pressure gas circulation device.

[0025] Furthermore, the high-pressure gas continuous circulation device for directional hole drilling in coal mines also includes a support frame, and both sides of the support frame are provided with support shafts corresponding to the connection holes of the first connection plate, the second connection plate and the third connection plate; the support shafts are inserted into the corresponding connection holes;

[0026] The support frame is provided with a plurality of through holes, and the base control hydraulic valve is connected to the high-pressure gas circulation device through a plurality of hydraulic pipelines; the plurality of hydraulic pipelines pass through the through holes of the support frame one by one, and are respectively connected to the hydraulic holes of the first base and the second base, the upper and lower ends of the ball valve air inlet, and the hydraulic holes of the opening and closing core shaft one by one;

[0027] The base-controlled hydraulic valve can transmit hydraulic force to the corresponding hydraulic holes, the upper and lower ends of the ball valve air inlet, and the hydraulic holes of the opening and closing core shaft through multiple hydraulic pipelines.

[0028] Further, the base-controlled hydraulic valve includes a ball valve opening and closing control valve, a base opening and closing control valve, a sealing member opening and closing control valve and a hydraulic oil inlet and outlet control valve;

[0029] The ball valve opening and closing control valve, the base opening and closing control valve and the sealing member opening and closing control valve are respectively connected to the upper and lower ends of the ball valve air inlet of the first base and the second base, the opening and closing core shaft hydraulic hole and the hydraulic hole through corresponding hydraulic pipelines;

[0030] The hydraulic oil inlet and outlet control valves are respectively connected with the ball valve opening and closing control valve, the base opening and closing control valve and the sealing element opening and closing control valve.

[0031] Furthermore, the sealing element is made of elastic material.

[0032] According to another aspect of the present invention, there is provided an operating method for the above-mentioned high-pressure gas continuous circulation device for directional hole drilling in underground coal mines, the operating method comprising:

[0033] Step 1: Preset the directional drilling position and hole depth required for the drilling operation;

[0034] Step 2: transport the high-pressure gas continuous circulation device for directional hole drilling in the coal mine to the operation site and connect the corresponding components;

[0035] Step 3: Use external lifting equipment to hang the high-pressure gas circulation device above the drilling rig power unit and the drill pipe clamp;

[0036] Step 4: Use the drilling rig power unit to provide drilling power to the drill pipe, and simultaneously use the hydraulically controlled reversing valve to control the air compressor to deliver high-pressure gas to the inside of the drill pipe through the blower until the drill pipe completes the drilling operation;

[0037] Step 5: Pull back the drilling rig power unit and align the threaded connection of the drill pipe with the gas supply pipe of the high-pressure gas circulation device;

[0038] Step 6: Use external lifting equipment to lower the high-pressure gas circulation device to a position coaxial with the drill pipe;

[0039] Step 7: Control the first base and the second base of the high-pressure gas circulation device to close, so that the two sealing members of the first base and the second base hold the drill pipe tightly;

[0040] Step 8: Disassemble and remove the air supply device, close the shut-off ball valve of the high-pressure gas circulation device, and use the hydraulically controlled reversing valve to control the air compressor to supply gas to the drill pipe through the gas supply pipeline of the high-pressure gas circulation device;

[0041] Step 9: Drive another drill rod from the rear of the power head of the drilling rig power unit; connect the drill rod driven this time to the air supply unit, and reconnect the air supply unit to the drilling rig power unit;

[0042] Step 10: Control the first base and the second base of the high-pressure gas circulation device to open; use an external lifting device to lift the high-pressure gas circulation device above the drill pipe;

[0043] Step 11: Use the drilling rig power unit to provide drilling power to the drill pipe, and simultaneously use the hydraulic control reversing valve to control the air compressor to deliver high-pressure gas to the inside of the drill pipe through the air supply unit until the drill pipe driven this time completes the drilling operation;

[0044] Among them, during normal drilling, steps 5 to 11 are repeated until the drilling operation is completed; if a collapsed hole or water-producing stratum is encountered during drilling, step 12 is added: when the amount of slag returned from the hole mouth increases significantly during drilling, or water is discharged, the power head stops feeding and is pulled back 20 to 30 cm, the front joint of the strong blowing short section is fully extended, and compressed air is sprayed in the opposite direction from the injection hole on the strong blowing short section to strengthen slag discharge and drainage, until the slag discharge and drainage at the hole mouth are significantly reduced and do not affect continued drilling, then the power head is switched to feed and the drilling construction is continued.

[0045] The high-pressure gas continuous circulation device for directional hole drilling in coal mines provided by the present invention aims at the problems to be solved urgently in the prior art and invents a set of high-pressure gas circulation devices. During the drilling process, when the previous drill rod completes the drilling and a new drill rod needs to be connected, the high-pressure gas circulation device is used to maintain the high-pressure gas circulation, thereby reducing the disturbance to the hole wall and continuously maintaining the air supply, slag discharge and water drainage, thereby reducing the risk of drill sticking and air compressor suffocation.

[0046] Compared with the prior art, the present invention has the following technical effects:

[0047] (1) It eliminates the positive and negative pressure excitement in the hole caused by stopping the air compressor when adding drill pipes, which is conducive to maintaining constant pressure in the borehole and stable hole wall;

[0048] (2) It eliminates the residence time of drill cuttings and water in the borehole when adding drill pipes, thus reducing the drill bit sticking rate;

[0049] (3) It reduces the time required to re-establish pressure by adding drill pipes, thereby improving drilling efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0050] The drawings constituting a part of the present application are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0051] Figure 1 It is a schematic diagram of the overall structure of the high-pressure gas continuous circulation device for directional hole drilling in coal mines of the present invention;

[0052] Figure 2 It is a schematic diagram of the first base structure in the present invention;

[0053] Figure 3 is a structural schematic diagram of the first base in the present invention at another angle;

[0054] Figure 4 is a cross-sectional view of the second base in the present invention;

[0055] Figure 5 It is a structural schematic diagram of the ball valve body in the present invention;

[0056] Figure 6 It is a schematic diagram of the structure of the cut-off ball valve and the gear shaft meshing in the present invention;

[0057] Figure 7 It is a structural schematic diagram of the support frame in the present invention;

[0058] Figure 8 It is a schematic diagram of the connection relationship between the base control hydraulic valve and the high-pressure gas circulation device in the present invention;

[0059] Fig. 9is a schematic diagram of the device connection relationship corresponding to step 3 in an embodiment of the present invention;

[0060] Fig.10 is a schematic diagram of the device connection relationship corresponding to step 5 in an embodiment of the present invention;

[0061] Fig.11 is a schematic diagram of the device connection relationship corresponding to step 7 in an embodiment of the present invention;

[0062] Fig.12 is a schematic diagram of the device connection relationship corresponding to step 9 in an embodiment of the present invention;

[0063] Fig.13 It is a structural schematic diagram of the strong blowing short section in the present invention;

[0064] Fig.14 It is a structural schematic diagram of the front joint of the strong blowing short section in the present invention;

[0065] Fig.15 It is a structural schematic diagram of the rear joint of the strong blowing short section in the present invention.

[0066] The above drawings include the following reference numerals:

[0067] 1. Air compressor; 2. Air blower; 3. Drill rod holder; 4. High-pressure gas circulation device; 5. Power head; 6. First base; 7. Second base; 8. Shut-off ball valve; 9. Hydraulic control reversing valve; 10. Seal; 11. Base control hydraulic valve; 12. Support bracket; 13. Drill rod; 14. Strong blowing short section; 15. Air screw motor; 16. Drill bit.

[0068] 601, clamping plate; 602, fixing block; 603, first connecting plate; 604, ball valve air inlet; 605, transmission rack; 606, air supply port; 607, air supply pipeline; 608, second connecting plate; 609, third connecting plate; 610, base opening and closing mandrel; 611, opening and closing mandrel hydraulic hole;

[0069] 801, ball valve body; 802, gear shaft;

[0070] 1001, hydraulic hole; 1101, ball valve opening and closing control valve; 1102, base opening and closing control valve; 1103, seal opening and closing control valve; 1104, hydraulic oil inlet and outlet control valve;

[0071] 1201, supporting shaft; 1202, through hole;

[0072] 1401, front joint; 1402, rear joint. DETAILED DESCRIPTION

[0073] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, not all of the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and is by no means intended to limit the present invention and its application or use. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0074] like Figures 1 to 15 As shown, an embodiment of the present invention provides a high-pressure gas continuous circulation device for directional hole drilling in coal mines, comprising an air compressor 1, a drilling rig power device, an air blower 2, a drill rod clamp 3, a high-pressure gas circulation device 4, a drill rod 13, a strong blowing short section 14, an air screw motor 15 and a drill bit 16; wherein the air compressor 1 is connected to the air blower 2 and the high-pressure gas circulation device 4 respectively, and is used to transmit high-pressure gas to the two respectively; the power head 5 of the drilling rig power device is connected to one end of the drill rod 13, and is used to provide drilling power for the drill rod 13; the air blower 2 is connected to the inside of the drill rod 13 through the power head 5, and is used to transport gas to the inside of the borehole; the drill rod clamp 3 is installed at the orifice of the borehole, and is used to clamp the drill rod 13, and is connected to the power head 5 is used in conjunction with the drill rod 13 to achieve the clamping and unloading of the drill rod 13; the high-pressure gas circulation device 4 is arranged between the power head 5 and the drill rod clamp 3, which can hold the drill rod 13 tightly and can deliver gas into the borehole when the drill rod 13 stops drilling; the strong blowing short section 14 is installed between the drill rod 13 and the air screw motor 15, and the strong blowing short section 14 includes a front joint 1401 and a rear joint 1402 that are movably connected. The end of the air screw motor 15 is installed with a drill bit 16. When the cuttings increase or the coal and rock layer produces water during drilling, the power head 5 pulls back the drill rod 13, and the front joint 1401 of the strong blowing short section 14 extends relative to the rear joint 1402 and exposes the injection hole, and the compressed air is ejected from the injection hole on the front joint 1401 to enhance the ability of slag and water discharge. Among them, the angle between the outlet direction of the injection hole and the drilling direction of the borehole is an obtuse angle.

[0075] Through the above scheme, during the drilling process, when the previous drill rod 13 completes drilling and a new drill rod 13 needs to be connected, the high-pressure gas circulation device 4 is used to maintain high-pressure gas circulation, reduce disturbance to the hole wall, and continue to maintain air supply, slag discharge and water drainage, thereby reducing the risk of drill sticking and air compressor suffocation.

[0076] like Figures 2 to 6 As shown, the high-pressure gas circulation device 4 includes a first base 6 and a second base 7 of the same shape and size; the first base 6 includes an arc-shaped clamping plate 601, and a fixing block 602 is arranged in the middle of the outer side of the clamping plate 601; a first connecting plate 603 is arranged on the upper wall of the fixing block 602, and a connecting hole is opened on the first connecting plate 603;

[0077] The first base 6 and the second base 7 can be assembled with each other and fixedly connected by the first connecting plate 603. When the first base 6 and the second base 7 are assembled, the space formed by the clamping plates 601 of the first base 6 and the second base 7 can fix and clamp the drill rod 13.

[0078] The high-pressure gas circulation device 4 also includes a shutoff ball valve 8, which is composed of two ball valve bodies 801 of the same shape. The middle part of the shutoff ball valve 8 is through-set; gear shafts 802 are set on opposite sides of the shutoff ball valve 8, and the central axis of the gear shaft 802 is perpendicular to the central axis of the through area of ​​the shutoff ball valve 8;

[0079] A through mounting hole is provided on the first base 6, and the mounting hole of the first base 6 penetrates both the clamping plate 601 and the fixing block 602, and a ball valve body 801 is sealed and installed in the mounting hole of the first base 6;

[0080] The fixed block 602 is also provided with a vertically penetrating ball valve air inlet 604, the upper and lower ends of which can be connected to an external hydraulic device, and the ball valve air inlet 604 is connected to the mounting hole of the first base 6;

[0081] A transmission rack 605 capable of moving up and down is provided in the ball valve air inlet 604. When the intercepting ball valve 8 is installed inside the mounting hole of the first base 6, the gear shaft of the intercepting ball valve 8 meshes with the transmission rack 605.

[0082] A transversely penetrating air supply port 606 is provided on the side wall of the first base 6, and the air supply port 606 does not contact the mounting hole of the first base 6;

[0083] An air supply pipe 607 is installed in the air supply port 606 , and the first base 6 is connected to the air compressor 1 through the air supply pipe 607 .

[0084] When in use, when the first base 6 and the second base 7 are close to each other, the first base 6 and the second base 7 can be fixedly connected by conventional connection methods such as bolt connection to achieve the purpose of fixing and clamping the drill pipe. In addition, by connecting the ball valve air inlet 604 through an external hydraulic device, hydraulic force is transmitted to the transmission rack 605, so that the transmission rack 605 can move up and down, thereby driving the intercepting ball valve 8 to rotate. The rotation of the intercepting ball valve 8 drives the rotation of the through-hole area in the middle, so that the middle of the high-pressure gas circulation device 4 can be closed to achieve interception.

[0085] The air compressor 1 is connected to the blower 2 and the high-pressure gas circulation device 4 respectively through the hydraulically controlled reversing valve 9. The opening and closing of the high-pressure gas circulation device 4 and the independent opening and closing of the intercepting ball valve 8 can be directly realized through the hydraulically controlled reversing valve 9.

[0086] Furthermore, a seal 10 is provided at the front end of the clamping plate 601, and the seal 10 is an arc shape matching the clamping plate 601; when the first base 6 and the second base 7 are assembled together, the two seals 10 are assembled together and seal and clamp the drill rod 13. The seal 10 is made of elastic material to improve the sealing effect.

[0087] like Figure 7 and Figure 8 As shown, the high-pressure gas continuous circulation device for directional hole drilling in coal mines also includes a base control hydraulic valve 11, wherein the upper parts of the two clamping plates 601 are provided with a second connecting plate 608 and a third connecting plate 609, the second connecting plate 608 and the third connecting plate 609 are respectively located on both sides of the fixed block 602, and the second connecting plate 608 and the third connecting plate 609 are provided with connecting holes;

[0088] A hydraulic hole 1001 is provided on the outer side of the sealing member 10; a mounting hole is provided on the side wall of the fixed block 602, a base opening and closing spindle 610 is installed in the mounting hole of the fixed block 602, an opening and closing spindle hydraulic hole 611 is provided on the upper wall of the fixed block 602, and the opening and closing spindle hydraulic hole 611 is connected to the mounting hole of the fixed block 602 to connect to the base opening and closing spindle 610 to control the opening and closing of the high-pressure gas circulation device 4.

[0089] In addition, the high-pressure gas continuous circulation device for directional hole drilling in coal mines also includes a support frame 12, and both sides of the support frame 12 are provided with support shafts 1201 corresponding to the connection holes of the first connection plate 603, the second connection plate 608 and the third connection plate 609; the support shafts 1201 penetrate into the corresponding connection holes;

[0090] The support frame 12 is provided with a plurality of through holes 1202, and the base control hydraulic valve 11 is connected to the high-pressure gas circulation device 4 through a plurality of hydraulic pipelines; the plurality of hydraulic pipelines pass through the through holes 1202 of the support frame 12 one by one, and are respectively connected to the hydraulic holes 1001 of the first base 6 and the second base 7, the upper and lower ends of the ball valve air inlet 604, and the hydraulic holes 611 of the opening and closing mandrel one by one;

[0091] The base control hydraulic valve 11 can transmit hydraulic force to the corresponding hydraulic holes 1001, the upper and lower ends of the ball valve air inlet 604 and the opening and closing core shaft hydraulic hole 611 through multiple hydraulic pipelines.

[0092] This arrangement can realize automatic opening and closing of the high pressure gas circulation device 4. The base controls the hydraulic valve 11 to transmit hydraulic force to the corresponding hydraulic holes 1001, the upper and lower ends of the ball valve air inlet 604 and the hydraulic hole 611 of the opening and closing core shaft through multiple hydraulic pipelines.

[0093] In one embodiment, at least two hydraulic holes 611 of the opening and closing spindle are provided, which are respectively connected to the two ends of the base opening and closing spindle 610, so as to achieve the purpose of pushing the base opening and closing spindle 610 to move in the opening and closing directions respectively, thereby driving the high-pressure gas circulation device 4 to open and close.

[0094] When the first base 6 and the second base 7 of the high-pressure gas circulation device 4 need to be closed, the base-controlled hydraulic valve 11 is used to supply hydraulic force to the hydraulic hole 1001 and the opening and closing core shaft hydraulic hole 611 that controls the closure, so that the high-pressure gas circulation device 4 can be closed.

[0095] When the first base 6 and the second base 7 of the high-pressure gas circulation device 4 need to be separated, the base control hydraulic valve 11 stops supplying hydraulic force to the hydraulic hole 1001 and the opening and closing core shaft hydraulic hole 611 that controls the closure, and only supplies hydraulic force to the opening and closing core shaft hydraulic hole 611 that controls the opening, so that the high-pressure gas circulation device 4 can be opened.

[0096] Furthermore, the base-controlled hydraulic valve 11 includes a ball valve opening and closing control valve 1101, a base opening and closing control valve 1102, a sealing opening and closing control valve 1103 and a hydraulic oil inlet and outlet control valve 1104; the ball valve opening and closing control valve 1101, the base opening and closing control valve 1102 and the sealing opening and closing control valve 1103 are respectively connected to the upper and lower ends of the ball valve air inlet 604 of the first base 6 and the second base 7, the opening and closing core shaft hydraulic hole 611 and the hydraulic hole 1001 through corresponding hydraulic pipelines; the hydraulic oil inlet and outlet control valve 1104 is respectively connected to the ball valve opening and closing control valve 1101, the base opening and closing control valve 1102 and the sealing opening and closing control valve 1103.

[0097] This arrangement can realize the individual control of the upper and lower ends of the ball valve air inlet 604, the opening and closing core shaft hydraulic hole 611 and the hydraulic hole 1001 in a one-to-one correspondence.

[0098] The present invention also provides an operating method for the above-mentioned high-pressure gas continuous circulation device for directional hole drilling in underground coal mines, and the operating method comprises:

[0099] Step 1: Preset the directional drilling position and hole depth required for the drilling operation;

[0100] Step 2: transport the high-pressure gas continuous circulation device for directional hole drilling in the coal mine to the operation site and connect the corresponding components;

[0101] Step 3: If Fig. 9 As shown, the high-pressure gas circulation device 4 is suspended above the drilling rig power device and the drill rod clamp 3 by an external lifting device;

[0102] Step 4: Use the drilling rig power device to provide drilling power to the drill rod 13, and simultaneously use the hydraulic control reversing valve 9 to control the air compressor 1 to deliver high-pressure gas to the inside of the drill rod 13 through the air blower 2 until the drill rod 13 completes the current drilling operation;

[0103] Step 5: Fig. 9 As shown, pull back the drilling rig power device to align the threaded connection of the drill rod 13 with the gas supply pipe 607 of the high-pressure gas circulation device 4;

[0104] Step 6: Use external lifting equipment to lower the high-pressure gas circulation device 4 to a coaxial position with the drill pipe 13;

[0105] Step 7: Fig.11 As shown, the first base 6 and the second base 7 of the high-pressure gas circulation device 4 are controlled to close, so that the two sealing members 10 of the first base 6 and the second base 7 hold the drill pipe 13 tightly;

[0106] Step 8: Disassemble and remove the air supply device 2, close the shut-off ball valve 8 of the high-pressure gas circulation device 4, and use the hydraulically controlled reversing valve 9 to control the air compressor 1 to supply gas to the drill pipe 13 through the gas supply pipe 607 of the high-pressure gas circulation device 4;

[0107] Step 9: Fig.12 As shown, another drill rod 13 is driven in from the rear of the power head 5 of the drilling rig power device; the drill rod 13 driven in this time is connected to the air blower 2, and the air blower 2 is reconnected to the drilling rig power device;

[0108] Step 10: Control the first base 6 and the second base 7 of the high-pressure gas circulation device 4 to open; use an external lifting device to lift the high-pressure gas circulation device 4 to above the drill pipe 13;

[0109] Step 11: Use the drilling rig power device to provide drilling power to the drill rod 13, and simultaneously use the hydraulic control reversing valve 9 to control the air compressor 1 to deliver high-pressure gas to the inside of the drill rod 13 through the air blower 2 until the drill rod 13 driven this time completes the drilling operation;

[0110] Among them, during normal drilling, steps 5 to 11 are repeated until the drilling operation is completed; if a collapsed hole or water-producing stratum is encountered during drilling, step 12 is added: when the slag returned from the hole mouth increases significantly during drilling, or water is discharged, the power head 5 stops feeding and is pulled back 20 to 30 cm, the front joint 1401 of the strong blowing short section 14 is fully extended, and compressed air is reversely ejected from the injection hole on the strong blowing short section 14 to strengthen slag discharge and drainage, until the slag discharge and drainage at the hole mouth are significantly reduced and do not affect continued drilling, then the power head 5 is switched to feed and the drilling construction is continued.

[0111] Compared with the prior art, the present invention has the following technical effects:

[0112] (1) It eliminates the positive and negative pressure excitement in the hole caused by stopping the air compressor when adding drill pipes, which is conducive to maintaining constant pressure in the borehole and stable hole wall;

[0113] (2) It eliminates the residence time of drill cuttings and water in the borehole when adding drill pipes, thus reducing the drill bit sticking rate;

[0114] (3) It reduces the time required to re-establish pressure by adding drill pipes, thereby improving drilling efficiency.

[0115] The above is only an optional embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may be modified and varied in various ways. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

[0116] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0117] Unless otherwise specifically stated, the relative arrangement, numerical expressions and numerical values ​​of the parts and steps set forth in these embodiments do not limit the scope of this solution. At the same time, it should be understood that, for ease of description, the sizes of the various parts shown in the accompanying drawings are not drawn according to the actual proportional relationship. The technology, methods and equipment known to those of ordinary skill in the relevant art may not be discussed in detail, but in appropriate cases, the technology, methods and equipment should be considered as a part of the specification. In all examples shown and discussed here, any specific value should be interpreted as being only exemplary, rather than as a limitation. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters represent similar items in the following drawings, so that once a certain item is defined in an accompanying drawing, it does not need to be further discussed in subsequent drawings.

[0118] In the description of this scheme, it needs to be understood that the directions or positional relationships indicated by directional words such as "front, back, up, down, left, right", "lateral, vertical, perpendicular, horizontal" and "top, bottom" are usually based on the directions or positional relationships shown in the drawings. They are only for the convenience of describing this scheme and simplifying the description. Unless otherwise stated, these directional words do not indicate or imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation. Therefore, they cannot be understood as limiting the scope of protection of this scheme; the directional words "inside and outside" refer to the inside and outside relative to the contours of each component itself.

[0119] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used here to describe the spatial positional relationship between a device or feature and other devices or features as shown in the figure. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figure. For example, if the device in the accompanying drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below other devices or structures". Thus, the exemplary term "above" can include both "above" and "below". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatially relative descriptions used here are interpreted accordingly.

[0120] In addition, it should be noted that the use of words such as "first" and "second" to limit components is only to facilitate the distinction between corresponding components. Unless otherwise stated, the above words have no special meaning and therefore cannot be understood as limiting the scope of protection of this scheme.

Claims

1. A high-pressure gas continuous circulation device for directional hole drilling in coal mines, characterized in that: It comprises an air compressor (1), a drilling rig power device, an air blower (2), a drill rod holder (3), a high-pressure gas circulation device (4), a drill rod (13), a strong blowing short joint (14), an air screw motor (15) and a drill bit (16); wherein, The air compressor (1) is connected to the air blower (2) and the high-pressure gas circulation device (4) respectively, and is used to transmit high-pressure gas to the two respectively; The power head (5) of the drilling rig power device is connected to one end of the drill rod (13) and is used to provide drilling power for the drill rod (13); The air supply device (2) is connected to the inside of the drill rod (13) through the power head (5) and is used to supply gas to the inside of the drill hole; The drill rod clamp (3) is installed at the opening of the drill hole and is used to clamp the drill rod (13). It is used in conjunction with the power head (5) to achieve clamping and unclamping of the drill rod (13). The high-pressure gas circulation device (4) is arranged between the power head (5) and the drill rod clamp (3), and is capable of holding the drill rod (13) tightly and delivering gas into the borehole when the drill rod (13) stops drilling; The strong blowing short section (14) is installed between the drill rod (13) and the air screw motor (15). The strong blowing short section (14) comprises a front joint (1401) and a rear joint (1402) which are movably connected. The drill bit (16) is installed at the end of the air screw motor (15). When the amount of drill cuttings increases or water comes out of the coal and rock layers during drilling, the power head (5) pulls back the drill rod (13), and the front joint (1401) of the strong blowing short section (14) extends out relative to the rear joint (1402) and exposes a spray hole. Compressed air is sprayed from the spray hole on the front joint (1401) to enhance the ability of slag and water discharge.

2. The high-pressure gas continuous circulation device for directional hole drilling in coal mines according to claim 1, characterized in that: The high-pressure gas circulation device (4) comprises a first base (6) and a second base (7) of the same shape and size; the first base (6) comprises an arc-shaped clamping plate (601), and a fixing block (602) is arranged in the middle of the outer side of the clamping plate (601); a first connecting plate (603) is arranged on the upper wall of the fixing block (602), and a connecting hole is opened on the first connecting plate (603); The first base (6) and the second base (7) can be assembled with each other and fixedly connected via the first connecting plate (603); when the first base (6) and the second base (7) are assembled, the space formed by the clamping plates (601) of the first base (6) and the second base (7) can be used to fix and clamp the drill rod (13).

3. The high-pressure gas continuous circulation device for directional hole drilling in coal mines according to claim 2, characterized in that: The high-pressure gas circulation device (4) further comprises a shutoff ball valve (8), the shutoff ball valve (8) being composed of two ball valve bodies (801) of the same shape, the middle portion of the shutoff ball valve (8) being through-set; gear shafts (802) are provided on opposite sides of the shutoff ball valve (8), the central axis of the gear shaft (802) being perpendicular to the central axis of the through-set region of the shutoff ball valve (8); A through mounting hole is provided on the first base (6), the mounting hole of the first base (6) simultaneously passes through the clamping plate (601) and the fixing block (602), and the ball valve body (801) is sealedly mounted in the mounting hole of the first base (6); The fixed block (602) is also provided with a vertically penetrating ball valve air inlet (604), the upper and lower ends of which can be connected to an external hydraulic device, and the ball valve air inlet (604) is communicated with the mounting hole of the first base (6); A transmission rack (605) capable of moving up and down is arranged in the ball valve air inlet (604); when the shutoff ball valve (8) is installed inside the mounting hole of the first base (6), the gear shaft of the shutoff ball valve (8) meshes with the transmission rack (605); A transversely penetrating air supply port (606) is provided on the side wall of the first base (6), and the air supply port (606) does not contact the mounting hole of the first base (6); An air supply pipe (607) is installed in the air supply port (606), and the first base (6) is connected to the air compressor (1) via the air supply pipe (607).

4. The high-pressure gas continuous circulation device for directional hole drilling in coal mines according to claim 2, characterized in that: The air compressor (1) is connected to the air blower (2) and the high-pressure gas circulation device (4) respectively via a hydraulically controlled reversing valve (9).

5. The high-pressure gas continuous circulation device for directional hole drilling in coal mines according to claim 3, characterized in that: A sealing member (10) is provided at the front end of the clamping plate (601), and the sealing member (10) is in an arc shape matching the clamping plate (601); when the first base (6) and the second base (7) are assembled with each other, the two sealing members (10) are assembled with each other and sealably clamp the drill rod (13).

6. The high-pressure gas continuous circulation device for directional hole drilling in coal mines according to claim 5, characterized in that: The high-pressure gas continuous circulation device for directional hole drilling in coal mines also includes a base-controlled hydraulic valve (11), wherein: A second connecting plate (608) and a third connecting plate (609) are disposed on the upper parts of the two clamping plates (601); the second connecting plate (608) and the third connecting plate (609) are respectively located on two sides of the fixing block (602); and connecting holes are provided on the second connecting plate (608) and the third connecting plate (609); A hydraulic hole (1001) is provided on the outer side of the sealing member (10); a mounting hole is provided on the side wall of the fixed block (602), a base opening and closing spindle (610) is installed in the mounting hole of the fixed block (602), an opening and closing spindle hydraulic hole (611) is provided on the upper wall of the fixed block (602), and the opening and closing spindle hydraulic hole (611) is connected to the mounting hole of the fixed block (602) to connect to the base opening and closing spindle (610) to control the opening and closing of the high-pressure gas circulation device (4).

7. The high-pressure gas continuous circulation device for directional hole drilling in coal mines according to claim 6, characterized in that: The high-pressure gas continuous circulation device for directional hole drilling in coal mines also includes a support frame (12), and both sides of the support frame (12) are provided with support shafts (1201) corresponding to the connection holes of the first connection plate (603), the second connection plate (608) and the third connection plate (609); the support shafts (1201) are inserted into the corresponding connection holes; The support frame (12) is provided with a plurality of through holes (1202), and the base control hydraulic valve (11) is connected to the high-pressure gas circulation device (4) through a plurality of hydraulic pipelines; the plurality of hydraulic pipelines pass through the through holes (1202) of the support frame (12) in a one-to-one correspondence, and are respectively connected to the hydraulic holes (1001) of the first base (6) and the second base (7), the upper and lower ends of the ball valve air inlet (604), and the hydraulic hole (611) of the opening and closing core shaft in a one-to-one correspondence; The base control hydraulic valve (11) can transmit hydraulic force to the corresponding hydraulic holes (1001), the upper and lower ends of the ball valve air inlet (604) and the opening and closing core shaft hydraulic hole (611) respectively through the plurality of hydraulic pipelines.

8. The high-pressure gas continuous circulation device for directional hole drilling in coal mines according to claim 6, characterized in that: The base-controlled hydraulic valve (11) comprises a ball valve opening and closing control valve (1101), a base opening and closing control valve (1102), a sealing member opening and closing control valve (1103) and a hydraulic oil inlet and outlet control valve (1104); The ball valve opening and closing control valve (1101), the base opening and closing control valve (1102) and the sealing member opening and closing control valve (1103) are respectively connected to the upper and lower ends of the ball valve air inlet (604) of the first base (6) and the second base (7), the opening and closing core shaft hydraulic hole (611) and the hydraulic hole (1001) through corresponding hydraulic pipelines; The hydraulic oil inlet and outlet control valve (1104) is respectively connected to the ball valve opening and closing control valve (1101), the base opening and closing control valve (1102) and the sealing member opening and closing control valve (1103).

9. The high-pressure gas continuous circulation device for directional hole drilling in coal mines according to claim 5, characterized in that: The sealing element (10) is made of elastic material.

10. An operating method for the high-pressure gas continuous circulation device for directional hole drilling in coal mines according to claim 1, characterized in that: The operation method comprises: Step 1: Preset the directional drilling position and hole depth required for the drilling operation; Step 2: transport the high-pressure gas continuous circulation device for directional hole drilling in the coal mine to the operation site and connect corresponding components; Step 3: Using external lifting equipment, the high-pressure gas circulation device (4) is suspended above between the drilling rig power device and the drill rod clamp (3); Step 4: using the drilling rig power device to provide drilling power to the drill rod (13), and simultaneously using the hydraulically controlled reversing valve (9) to control the air compressor (1) to deliver high-pressure gas to the inside of the drill rod (13) through the air supply device (2) until the drill rod (13) completes the current drilling operation; Step 5: Pull back the drilling rig power device to align the threaded connection of the drill rod (13) with the gas supply pipe (607) of the high-pressure gas circulation device (4); Step 6: Use external lifting equipment to lower the high-pressure gas circulation device (4) to a coaxial position with the drill pipe (13); Step 7: Control the first base (6) and the second base (7) of the high-pressure gas circulation device (4) to close together, so that the two sealing members (10) of the first base (6) and the second base (7) tightly hold the drill pipe (13); Step 8: Disassemble and remove the air supply device (2), close the shut-off ball valve (8) of the high-pressure gas circulation device (4), and use the hydraulically controlled reversing valve (9) to control the air compressor (1) to supply gas to the drill pipe (13) through the gas supply pipeline (607) of the high-pressure gas circulation device (4); Step 9: driving another drill rod (13) from the rear of the power head (5) of the drilling rig power device; connecting the drill rod (13) driven this time to the air blower (2), and reconnecting the air blower (2) to the drilling rig power device; Step 10: Control the first base (6) and the second base (7) of the high-pressure gas circulation device (4) to open; use external lifting equipment to lift the high-pressure gas circulation device (4) above the drill pipe (13); Step 11: using the drilling rig power device to provide drilling power to the drill rod (13), and simultaneously using the hydraulically controlled reversing valve (9) to control the air compressor (1) to deliver high-pressure gas to the inside of the drill rod (13) through the air supply device (2), until the drill rod (13) driven in this time completes the current drilling operation; During normal drilling, steps 5 to 11 are repeated until the drilling operation is completed; if a collapsed hole or water-discharging stratum is encountered during drilling, step 12 is added: when the amount of slag returned from the orifice increases significantly during drilling, or water is discharged, the power head (5) stops feeding and is pulled back 20 to 30 cm, the front joint (1401) of the strong blowing short section (14) is fully extended, and compressed air is sprayed in the opposite direction from the injection hole on the strong blowing short section (14) to strengthen slag discharge and water drainage, until the slag discharge and water drainage at the orifice are significantly reduced and do not affect continued drilling, then the power head (5) is switched to feed and the drilling operation is continued.

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