Rotary-sealing blowout-preventing dust-removing automatic deslagging system for compressed air drilling orifice of underground coal mine

Abstract

The invention discloses an underground coal mine compressed air drilling orifice rotary sealing blowout prevention dust removal automatic deslagging system which comprises an orifice pipe, an orifice four-way joint, a first sealing assembly, a second sealing assembly, a filtering type negative pressure bag and an automatic deslagging device. During drilling construction, the first sealing assembly and the second sealing assembly alternately act, sealing under the working conditions of axial movement and radial rotation of the drill rod is achieved, and reciprocating alternate sealing is conducted till drilling is conducted to the designed hole depth; meanwhile, the filtering type negative pressure bag achieves filtering type dust removal and gas pre-extraction of drilling dust and gas, and the automatic slag discharging device can automatically transfer drilling slag in a full-closed mode. Rotary sealing in the whole drilling process can be achieved, a large amount of dust is prevented from gushing out to pollute the operation environment and gas is prevented from gushing out to cause overrun accidents in the drilling process, meanwhile, solid-phase particles in the dust are effectively separated in the drilling process, the solid-phase particles are prevented from entering a main negative-pressure pipeline to block the pipeline, full-closed automatic transfer of drilling slag is achieved, and the working efficiency is improved. The automation level is improved, and the labor intensity of operators is reduced.

Description

Technical Field

[0001] The invention belongs to the technical field of coal mine drilling, and relates to a method for preventing blowout and removing dust at a compressed air drilling hole in an underground coal mine and for transporting drill slag, and specifically relates to a system and method for preventing blowout and removing dust at a compressed air drilling hole in an underground coal mine and for automatically discharging slag. Background Art

[0002] In coal mines, compressed air drilling technology is used to construct gas control boreholes, water exploration and drainage boreholes, and geological structure exploration boreholes. The compressed air drilling technology has little disturbance and damage to the hole wall, which is conducive to drilling holes under complex formation conditions and has a high drilling rate. At the same time, in recent years, the compressed air drilling technology has been combined with the directional drilling technology to develop a pneumatic directional drilling technology. In the construction of gas control drilling holes in broken soft coal seams, it can not only improve the drilling depth and hole rate, but also has the advantage of controllable drilling trajectory and high drilling coverage accuracy. It can effectively avoid gas control blind spots and has become one of the main technologies for gas control in broken soft coal seam mining areas. However, there are two major problems in the drilling process of compressed air drilling technology and pneumatic directional drilling technology: serious dust pollution and easy occurrence of gas over-limit accidents. For this reason, a large number of scientific researchers have conducted research. In response to the serious problem of dust pollution, a jet dust removal device has been developed. A high negative pressure is formed by a high-pressure jet to suck the dust returned from the hole into the dust removal device, and then dust is reduced by water mist; a The dust removal fan cooperates with the wind screen to remove dust. The dust returned from the orifice is removed by the jet dust removal device. The untreated dust is then isolated by the wind screen and removed by the dust removal fan. A dust removal pump truck is developed, and the jet dust removal device is integrated on the crawler body for easy relocation and transportation. The above-mentioned dust removal devices and dust removal equipment have not achieved full-process closed dust removal. A large amount of dust is still returned from the gap between the dust removal device and the drill pipe annulus, polluting the on-site working environment, and 100% dust removal cannot be achieved. In the gas super In terms of limits, various types of blowout preventers have been developed. In recent years, automatic blowout preventers have been developed. When a large amount of gas is detected to be gushing out of the hole, the blowout preventer is quickly closed through the automatic controller to seal the gas in the hole. However, the automatic blowout preventer is of the normally open type, that is, it is in an open state during the drilling construction process. When gas is detected to be gushing out of the hole, the time left for the blowout preventer to close is very limited. There is a phenomenon of gas leakage if the blowout preventer is not closed in time. Therefore, there is still a risk of gas exceeding the limit. Medium-pressure air drilling in broken soft coal seams often produces a large amount of drill cuttings. At present, manual cleaning is mainly used, which has high labor intensity for operators. Cleaning drill cuttings usually takes up drilling time, which affects the improvement of drilling efficiency. Summary of the invention

[0003] In view of the shortcomings existing in the prior art, the purpose of the present invention is to provide a coal mine underground compressed air drilling hole rotary seal anti-blowout dust removal automatic slag discharge system, so as to solve the problems existing in the prior art of incomplete dust treatment in compressed air drilling, the risk of gas exceeding the limit, the high labor intensity of drilling slag cleaning, and the disadvantage of improving drilling efficiency.

[0004] In order to solve the above technical problems, the present invention adopts the following technical solutions to achieve the above problems:

[0005] A coal mine underground pressure air drilling hole rotary seal anti-blowout dust removal automatic slag discharge system, comprising a hole pipe, a hole spool, a first sealing component, a second sealing component, a filtering negative pressure bag, and an automatic slag discharge device;

[0006] The orifice pipe, orifice four-way, first sealing assembly and second sealing assembly are arranged backward from the orifice in sequence and are sleeved on the outside of the drill pipe; the front port of the orifice four-way is connected to the orifice pipe, the rear port is connected to the first sealing assembly, the upper port is connected to the filtering negative pressure bag, and the lower port is connected to the automatic slag discharge device; the first sealing assembly and the second sealing assembly can automatically block the outer annulus of the drill pipe according to the dynamics of the drilling process to prevent the leakage of gas and coal dust; the second sealing assembly can move forward with the drilling of the drill pipe and move backward to reset after the drilling is completed; the filtering negative pressure bag can filter the solid particles in the dust generated by drilling and introduce the filtered dust and gas into the main negative pressure pipeline through a circular steel pipe to realize the filtering dust removal and pre-extraction of the drilling dust and gas; the automatic slag discharge device can fully enclosed and automatically transport the drilling cuttings falling from the orifice four-way.

[0007] The present invention also includes the following technical features:

[0008] Specifically, the first sealing component and the second sealing component are connected by plugging, and the second sealing component can be axially moved and reset by a reset spring;

[0009] The first sealing assembly comprises a first cylindrical outer shell and a first sealing inner cylinder therein, and a first bearing therebetween, a first expandable bladder is provided on the inner wall of the first sealing inner cylinder, and a first sealing flannel is provided on the outer side of the first expandable bladder;

[0010] The second sealing assembly includes a second cylindrical outer shell and a second sealing inner cylinder therein, and a second bearing therebetween. A second expandable bladder is provided on the inner wall of the second sealing inner cylinder, and a second sealing flannel is provided on the outer side of the second expandable bladder.

[0011] Specifically, the front end of the first cylindrical shell is connected to the rear port of the orifice four-way through a flange, the side wall is provided with a first air inlet, and the rear end side wall is provided with an annular groove with a rear end opening; the first cylindrical shell and the first sealed inner cylinder are single-acting through the first bearing and sealed through the first sealing ring; the side wall of the first sealed inner cylinder is provided with a first inner air inlet, and can be connected to the first expandable bladder and the first air inlet;

[0012] The front end of the second cylindrical outer shell can be inserted into the annular groove and an axial return spring is provided between the front end and the bottom of the annular groove, and a second air inlet is provided on the side wall; the second cylindrical outer shell can move axially along the annular groove; the second cylindrical outer shell and the second sealed inner cylinder realize single motion through the second bearing and realize sealing through the second sealing ring; the side wall of the second sealed inner cylinder is provided with a second internal air inlet, and can be connected to the second expandable bladder and the second air inlet.

[0013] Specifically, the first expandable bladder and the second expandable bladder are made of deformable material, can expand rapidly under the action of high-pressure gas, have a pressure bearing capacity of not less than 1Mpa, and are wear-resistant; the first sealing flannel cloth and the second sealing flannel cloth are made of soft flannel material and are wear-resistant.

[0014] Specifically, the first sealing assembly and the second sealing assembly are connected via a telescopic oil cylinder, and the second sealing assembly can be axially moved and reset via the telescopic oil cylinder;

[0015] The first sealing assembly comprises a first cylindrical rigid body and a first annular rubber block therein, a first extrusion ring and a first cylindrical piston, a first flange end cover is provided at the front end of the first cylindrical rigid body and the first annular rubber block, and a first flange is provided at the rear of the first cylindrical rigid body and the first piston;

[0016] The second sealing assembly includes a second cylindrical rigid body and a second annular rubber block therein, a second extrusion ring and a second cylindrical piston, a second flange end cover is provided at the front end of the second cylindrical rigid body, a thrust bearing is provided between the second flange end cover and the second annular rubber block, a thrust ball bearing is provided between the second extrusion ring and the second cylindrical piston, and a second flange plate is provided at the rear of the second cylindrical rigid body and the second piston.

[0017] Specifically, the first flange end cover is connected to the rear port of the orifice four-way, the rear side wall of the first cylindrical rigid body is provided with a first oil inlet and outlet, the first annular rubber block, the first extrusion ring and the first cylindrical piston are closely arranged in sequence from front to back, the rear outer convex ring and the rear end inner ring of the first cylindrical piston can form a first annular oil chamber between the first cylindrical rigid body and the first flange plate, and the first annular oil chamber is communicated with the first oil inlet and outlet, and the hydraulic oil enters the first annular oil chamber to push the first extrusion ring to squeeze the first annular rubber block so that it radially shrinks and deforms and is sealed with the drill pipe.

[0018] Specifically, the rear side wall of the second cylindrical rigid body is provided with a second oil inlet and outlet, the second annular rubber block, the second extrusion ring and the second cylindrical piston are closely arranged in sequence from front to back, the rear outer convex ring and the rear end inner ring of the second cylindrical piston can form a second annular oil chamber with the second cylindrical rigid body and the second flange, and the second annular oil chamber is communicated with the second oil inlet and outlet, and the hydraulic oil enters the second annular oil chamber to push the second extrusion ring to squeeze the second annular rubber block so that it radially shrinks and deforms and then seals with the drill pipe; the outer wall of the second annular rubber block, the outer wall of the second extrusion ring, the inner wall of the second flange end cover and the inner wall of the thrust bearing are provided with an inner sleeve; the inner sleeve, the second annular rubber block and the second extrusion ring can rotate synchronously with the drill pipe.

[0019] Specifically, the telescopic oil cylinder comprises an inner flange rigid body and an outer flange rigid body sleeved thereon, and a piston inserted in the annulus between the two from the rear; the front end flange of the inner flange rigid body is fixedly connected to the front end of the outer flange rigid body to form a front end sealed annulus; the piston comprises a piston head end, a piston rod body and a piston flange which are connected in sequence from front to back;

[0020] The front end flange of the inner flange rigid body is connected to the first flange plate, and the piston flange is connected to the second flange end cover; oil inlets and outlets are provided at the front and rear positions of the side wall of the outer flange rigid body, the oil inlets and outlets are connected to the annular space between the inner flange rigid body and the outer flange rigid body and are respectively located at the front and rear of the head end of the piston, and seals are provided between the rod body of the piston and the inner flange rigid body and between the piston and the outer flange rigid body, and the seals are located behind the oil inlets and outlets.

[0021] Specifically, the filtering negative pressure bag has two layers, the inner layer is breathable and does not pass solid particles, and the outer layer is airtight; the upper port of the orifice four-way is connected to the space between the inner layer and the outer layer; the circular steel pipe extends from the inner layer to the main negative pressure pipeline; the circular steel pipe is provided with a mesh on the side wall of the inner layer section.

[0022] Specifically, the automatic slag discharge device includes a slag discharge hose, a drilling slag collecting port, a flexible spiral slag discharger, a pneumatic motor, and a drilling slag collection device; the drilling slag collection port is connected to the slag discharge hose, and the upper end of the drilling slag collection port is connected to the slag discharge hose through a plug-in hole, the flexible spiral slag discharger is arranged in the slag discharge hose, the pneumatic motor can drive the flexible spiral slag discharger to rotate, and the drilling slag collection device is arranged at the end of the slag discharge hose.

[0023] Compared with the prior art, the present invention has the following technical effects:

[0024] The present invention adopts a fully enclosed anti-blowout dust removal automatic slag discharge system. On the one hand, the system negative pressure is used to extract dust and gas into the main negative pressure pipeline after filtration, which can prevent solid particles from entering the main negative pressure pipeline and causing blockage. On the other hand, the seal is sealed by alternating expansion of the seal, and the seal is sealed under axial movement and radial rotation conditions during the actual drilling process. It is suitable for drilling tool sealing of various structures, and truly realizes the full-process enclosed anti-blowout dust removal of the drilling process, which can prevent gas from exceeding the limit during the drilling process. In addition, the system realizes the automatic transportation of fully enclosed drill slag during the drilling process. In summary, the system method of the present invention can solve the technical problems of serious dust pollution during compressed air drilling, easy occurrence of gas spraying causing over-limit, and high labor intensity in cleaning a large amount of drill slag, ensure the safety of compressed air drilling, improve the working environment, improve the level of automation, reduce the labor intensity of operators, and improve the efficiency of drilling construction. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a schematic diagram of the overall structure of Example 1 of the present invention.

[0026] Figure 2 It is a schematic diagram of the structure of the first sealing component of Example 1 of the present invention.

[0027] Figure 3 It is a schematic diagram of the structure of the second sealing component of Example 1 of the present invention.

[0028] Figure 4 It is a schematic diagram of the filtering negative pressure bag and the circular steel pipe structure of the present invention and a coal dust and gas filtering route map.

[0029] Figure 5 It is a schematic diagram of the structure of the automatic slag discharge device of the present invention.

[0030] Figure 6 It is a schematic diagram of the overall structure of Example 2 of the present invention.

[0031] Figure 7 It is a schematic diagram of the structure of the first sealing component of Example 2 of the present invention.

[0032] Figure 8 It is a schematic diagram of the structure of the telescopic cylinder according to embodiment 2 of the present invention.

[0033] Fig. 9 It is a schematic diagram of the structure of the second sealing component of Example 2 of the present invention.

[0034] The meaning of each number in the figure is:

[0035] 1. Orifice tube, 2. Orifice four-way, 3. First sealing assembly, 4. Second sealing assembly, 5. Filter negative pressure bag, 6. Automatic slag discharge device; 7. Telescopic oil cylinder, 8. Main negative pressure pipeline; 311. First cylindrical shell, 312. First sealing inner cylinder, 313. First bearing, 314. First expandable bladder, 315. First sealing flannel, 316. First air inlet, 317. Annular groove, 318. First inner air inlet, 319. First sealing ring, 3110. Reset spring; 321. First cylindrical rigid body, 322. First annular rubber block, 323. First extrusion ring, 324. First cylindrical piston, 325. First flange end cover, 326. First flange plate, 327. First oil inlet and outlet, 328. First seal; 411. Second cylindrical shell, 412. Second sealing inner cylinder, 413. Second bearing, 414. First Second expandable bladder, 415. Second sealing flannel, 416. Second air inlet, 417. Second inner air inlet, 418. Second sealing ring; 421. Second cylindrical rigid body, 422. Second annular rubber block, 423. Second extrusion ring, 424. Second cylindrical piston, 425. Second flange end cover, 426. Thrust bearing, 427. Thrust ball bearing, 428. Second flange, 429. Second oil inlet and outlet, 4210. Inner sleeve, 4211. Second seal; 501. Inner layer, 502. Outer layer, 503. Round steel pipe; 601. Slag discharge hose, 602. Drilling cuttings collecting port, 603. Flexible spiral slag discharger, 604. Pneumatic motor, 605. Drilling cuttings collecting device; 701. Inner flange rigid body, 702. Outer flange rigid body, 703. Piston, 704. Oil inlet and outlet, 705. Seal, 706. Piston seal. DETAILED DESCRIPTION

[0036] The present invention discloses an automatic slag discharge system and method for compressed air drilling hole rotary sealing for anti-blowout dust removal in underground coal mines, including a hole pipe, a hole four-way, a first sealing component, a second sealing component, a filtering negative pressure bag, and an automatic slag discharge device. The automatic slag discharge device includes a flexible spiral slag discharger, a slag discharge hose, a drill slag collection port, a pneumatic motor, and a drill slag collection device. During the drilling construction of this system, the second sealing component is tightly fitted with the drill rod to achieve sealing and moves forward with the rotation of the drill rod. The drilling rig drives the drill rod to rotate and drill. When the drilling stroke is completed, the first sealing component is tightly fitted with the drill rod for sealing, and then the second sealing component is separated from the drill rod, and the second sealing component is moved back and reset; the second sealing component is tightly fitted with the drill rod for sealing again, and then the first sealing component is separated from the drill rod, and the drilling rig drives the drill rod to rotate and drill forward, and this reciprocating process is repeated until the borehole is drilled to the designed hole depth. During the drilling process, a large amount of dust returned from the hole reaches the four-way cavity at the orifice. Under the suction effect of negative pressure, the solid phase particles in the dust are filtered out through the filter-type negative pressure bag. The filtered dust and gas enter the main negative pressure pipeline, and the drill cuttings generated by drilling pass through the four-way slag discharge port at the orifice and are transferred to the drill cuttings collection device through the automatic slag discharge device. The system can achieve rotary sealing throughout the drilling process and is suitable for construction drilling tools of various structures to prevent gas gushing during drilling and causing over-limit accidents. At the same time, it can achieve effective separation of solid phase particles in dust during drilling, prevent solid phase particles from entering the main negative pressure pipeline and clogging the pipeline, and realize fully enclosed automatic transportation of drill cuttings, improve the level of automation, and reduce the labor intensity of operators.

[0037] Specific embodiments of the present invention are given below. It should be noted that the present invention is not limited to the following specific embodiments, and all equivalent changes made on the basis of the technical solution of this application fall within the protection scope of the present invention.

[0038] Embodiment 1:

[0039] like Figures 1 to 5 As shown, the present embodiment provides a coal mine underground compressed air drilling hole rotary seal anti-blowout dust removal automatic slag discharge system, characterized in that it includes a hole pipe 1, a hole four-way 2, a first sealing component 3, a second sealing component 4, a filtering negative pressure bag 5, and an automatic slag discharge device 6.

[0040] The orifice pipe 1, the orifice spool 2, the first sealing assembly 3, and the second sealing assembly 4 are arranged backward from the orifice in sequence and sleeved on the outside of the drill pipe; the front port of the orifice spool 2 is connected to the orifice pipe 1 through a flange, the rear port is connected to the first sealing assembly 3, the upper port is connected to the filtering negative pressure bag 5, and the lower port is connected to the automatic slag discharge device 6; the first sealing assembly 3 and the second sealing assembly 4 can both automatically and alternately block the outer annulus of the drill pipe according to the dynamics of the drilling process to prevent gas and coal dust from overflowing from the gap during the drilling process; the second sealing assembly 4 can move forward with the drilling of the drill pipe and After drilling is completed, it moves backward to reset; the filtering negative pressure bag 5 can filter the solid particles in the dust generated by drilling and introduce the filtered dust and gas into the main negative pressure pipeline 8 through the circular steel pipe 503 to achieve filtering dust removal and pre-extraction of drilling dust and gas, thereby preventing gas outflow and causing gas over-limit accidents, and at the same time can effectively prevent a large number of solid particles from being sucked into the main negative pressure pipeline 8, causing blockage of the negative pressure system; the automatic slag discharge device 6 can fully and automatically transport the drilling slag falling from the orifice four-way 2, thereby improving the level of automation and reducing the labor intensity of operators.

[0041] The first sealing component 3 and the second sealing component 4 are connected by plugging, and the second sealing component 4 can be axially moved and reset by the reset spring 3110.

[0042] The first sealing assembly 3 includes a first cylindrical outer shell 311 and a first sealing inner cylinder 312 therein, and a first bearing 313 therebetween. A first expandable bladder 314 is provided on the inner wall of the first sealing inner cylinder 312 , and a first sealing flannel 315 is provided on the outer side of the first expandable bladder 314 .

[0043] The second sealing assembly 4 includes a second cylindrical outer shell 411 and a second sealing inner cylinder 412 therein, and a second bearing 413 therebetween. A second expandable bladder 414 is provided on the inner wall of the second sealing inner cylinder 412 , and a second sealing flannel 415 is provided on the outer side of the second expandable bladder 414 .

[0044] The front end of the first cylindrical outer shell 311 is connected to the rear port of the orifice four-way 2 through a flange, and a first air inlet 316 is provided on the side wall, and an annular groove 317 with a rear end opening is provided in the rear end side wall; the first cylindrical outer shell 311 and the first sealed inner cylinder 312 realize single motion through the first bearing 313 and realize sealing through the first sealing ring 319; the side wall of the first sealed inner cylinder 312 is provided with a first internal air inlet 318, and can connect with the first expandable bladder 314 and the first air inlet 316; more specifically, the first sealing ring 319 is arranged on the front and rear sides of the first bearing 313, and the first air inlet 316 and the first internal air inlet 318 are both located between the first sealing rings 319 on both sides.

[0045] The front end of the second cylindrical outer shell 411 can be inserted into the annular groove 317 and an axial return spring 3110 is provided between the front end and the bottom of the annular groove 317, and a second air inlet 416 is provided on the side wall; the second cylindrical outer shell 411 can move axially along the annular groove 317 and the moving distance is the length of a single drilling stroke; the second cylindrical outer shell 411 and the second sealed inner cylinder 412 realize single motion through the second bearing 413 and realize sealing through the second sealing ring 418; the side wall of the second sealed inner cylinder 412 is provided with a second internal air inlet 417, and can be connected to the second expandable bladder 414 and the second air inlet 416; more specifically, the second sealing ring 418 is arranged on the front and rear sides of the second bearing 413, and the second air inlet 416 and the second internal air inlet 417 are both located between the second sealing rings 418 on both sides.

[0046] During the drilling process, pressurized air is alternately supplied to the first sealing component 3 and the second sealing component 4, so that the expandable bag expands and bulges, and the sealing flannel fits tightly against the drill rod to achieve sealing, thereby preventing gas and coal dust from overflowing from the gap during drilling and solving the problem of excessive gas during drilling.

[0047] The first expandable bladder 314 and the second expandable bladder 414 are made of deformable material, can expand rapidly under the action of high-pressure gas, have a pressure bearing capacity of not less than 1Mpa, and have good wear resistance; the first sealing flannel cloth 315 and the second sealing flannel cloth 415 are made of soft flannel material and have good wear resistance.

[0048] The filter type negative pressure bag 5 has two layers, the inner layer 501 is air permeable and does not pass solid particles, and the outer layer 502 is airtight; the upper port of the orifice 4-way 2 is connected to the space between the inner layer 501 and the outer layer 502; the circular steel pipe 503 extends from the inner layer 501 and is connected to the main negative pressure pipeline 8; the circular steel pipe 503 is located in the inner layer 501 and has a mesh on the side wall. A large amount of dust and gas generated by drilling passes through the orifice 4-way 2 and is sucked into the filter type negative pressure bag 5 by negative pressure. Under the filtering effect of the inner layer 501, the solid particles in the dust are filtered out, and the filtered dust and gas pass through the inner layer 501 into the circular steel pipe 503, and finally enter the main negative pressure pipeline 8. In this way, the filtering dust and gas of the drilling dust and gas are removed and the gas is pre-extracted, thereby preventing the gas from gushing out and causing a gas over-limit accident, and at the same time, it can effectively prevent a large number of solid particles from being sucked into the main negative pressure pipeline 8, causing the negative pressure system to be blocked.

[0049] The automatic slag discharge device 6 includes a slag discharge hose 601, a slag collection port 602, a flexible spiral slag discharger 603, an air motor 604, and a slag collection device 605; the slag collection port 602 is connected to the slag discharge hose 601, and the upper end of the slag collection port 602 is connected to the orifice spool 2 by plugging, the flexible spiral slag discharger 603 is arranged in the slag discharge hose 601, the air motor 604 can drive the flexible spiral slag discharger 603 to rotate, and the slag collection device 605 is arranged at the end of the slag discharge hose 601. During the drilling process, the air motor 604 is driven by high-pressure gas to drive the flexible spiral slag discharger 603 to rotate, and the slag that falls from the orifice spool 2 into the slag collection port 602 is transferred to the slag collection device 605 through the slag discharge hose 601, so as to realize the fully enclosed automatic transfer of slag, improve the automation level, and reduce the labor intensity of the operators. The slag discharge hose 601 is made of flexible material, and the spiral slag discharger is a flexible structure, which can be applied to the transportation of drilling slag along various routes.

[0050] In this embodiment, the coal mine underground compressed air drilling hole rotary seal anti-blowout dust removal automatic slag discharge system performs drilling construction, specifically including the following steps:

[0051] Step 1: sequentially connect the orifice tube, the orifice cross-piece, the first sealing component, the second sealing component, the filtering negative pressure bag, and the automatic slag discharge device;

[0052] Step 2: The first sealing component, the second sealing component, and the pneumatic motor are respectively connected to the air supply pipeline; the filter negative pressure bag and the upper end of the circular steel pipe are connected to the main negative pressure pipeline;

[0053] Step 3: Open the air supply valve of the air supply pipeline to supply air to the pneumatic motor, and the flexible spiral slag discharger starts to rotate. The drilling slag generated during the drilling process rotates through the flexible spiral slag discharger and is transported to the drilling slag collection device through the slag discharge hose;

[0054] Step 4: Open the air supply valve of the air supply pipeline to supply air to the second sealing component, wait for the second inflatable bag to expand and swell, and the second sealing flannel fits tightly against the drill rod;

[0055] Step 5: Drilling begins. When the drilling rig feed device completes one stroke of drilling, the air supply valve of the air supply pipeline is opened to supply air to the first sealing component. When the first expandable bag expands and bulges, the first sealing flannel is tightly fitted with the drill rod. The pressure relief valve of the air supply pipeline is opened to relieve the pressure of the second sealing component. The second expandable bag shrinks, the second sealing flannel is separated from the drill rod, and the second sealing component returns to its original position under the action of the return spring.

[0056] Step 6: Open the air supply valve of the air supply pipeline to supply air to the second sealing component. When the second expandable bag expands and bulges, the second sealing flannel is tightly fitted with the drill pipe. Open the pressure relief valve of the air supply pipeline to relieve the pressure of the first sealing component, the first expandable bag shrinks, the first sealing flannel is separated from the drill pipe, and the next drilling stroke begins.

[0057] Step 7: Repeat steps 5 and 6 to complete the drilling construction.

[0058] Embodiment 2:

[0059] like Figures 6 to 9 As shown, the present embodiment provides a coal mine underground compressed air drilling hole rotary seal anti-blowout dust removal automatic slag discharge system, including a hole pipe 1, a hole four-way 2, a first sealing component 3, a second sealing component 4, a filtering negative pressure bag 5, and an automatic slag discharge device 6; the first sealing component 3, the second sealing component 4 and the connection method of this embodiment are different from those of Example 1, and the structures of other components are the same.

[0060] In this embodiment, the first sealing assembly 3 and the second sealing assembly 4 are connected via a telescopic cylinder 7 , and the second sealing assembly 4 can be axially moved and reset via the telescopic cylinder 7 .

[0061] The first sealing assembly 3 includes a first cylindrical rigid body 321 and a first annular rubber block 322 therein, a first extrusion ring 323 and a first cylindrical piston 324. A first flange end cover 325 is provided at the front end of the first cylindrical rigid body 321 and the first annular rubber block 322, and a first flange plate 326 is provided at the rear of the first cylindrical rigid body 321 and the first piston 703.

[0062] The second sealing assembly 4 includes a second cylindrical rigid body 421 and a second annular rubber block 422, a second extrusion ring 423 and a second cylindrical piston 424 therein. A second flange end cover 425 is provided at the front end of the second cylindrical rigid body 421, a thrust bearing 426 is provided between the second flange end cover 425 and the second annular rubber block 422, a thrust ball bearing 427 is provided between the second extrusion ring 423 and the second cylindrical piston 424, and a second flange plate 428 is provided at the rear of the second cylindrical rigid body 421 and the second piston 703.

[0063] The first flange end cover 325 is connected to the rear port of the orifice spool 2, the front and rear ends of the first cylindrical rigid body 321 are respectively fixed to the first flange end cover 325 and the first flange plate 326, the rear side wall of the first cylindrical rigid body 321 is provided with a first oil inlet and outlet 327, the first annular rubber block 322, the first extrusion ring 323 and the first cylindrical piston 324 are closely arranged from front to back, the rear outer convex ring and the rear inner ring of the first cylindrical piston 324 can form a first annular oil cavity with the first cylindrical rigid body 321 and the first flange plate 326, and the first The annular oil chamber is communicated with the first oil inlet and outlet 327. The hydraulic oil enters the first annular oil chamber and pushes the first extrusion ring 323 to squeeze the first annular rubber block 322, causing it to expand radially and deform, and then seal with the drill pipe; a first seal 328 is provided between the first flange end cover 325 and the first cylindrical rigid body 321, between the first cylindrical piston 324 and the first cylindrical rigid body 321, between the rear outer convex ring of the first cylindrical piston 324 and the first cylindrical rigid body 321, and between the rear end inner ring of the first cylindrical piston 324 and the inner wall of the first flange 326.

[0064] The front and rear ends of the second cylindrical rigid body 421 are fixedly connected to the second flange end cover 425 and the second flange plate 428 respectively. The rear side wall of the second cylindrical rigid body 421 is provided with a second oil inlet and outlet 429. The second annular rubber block 422, the second extrusion ring 423 and the second cylindrical piston 424 are closely arranged from front to back. The rear outer convex ring and the rear inner ring of the second cylindrical piston 424 can form a second annular oil chamber with the second cylindrical rigid body 421 and the second flange plate 428, and the second annular oil chamber is communicated with the second oil inlet and outlet 429. The hydraulic oil enters the second annular oil chamber to push the second extrusion ring 423 to squeeze the second annular rubber block 422 so that it expands and deforms radially and then seals with the drill pipe. The outer wall of the second annular rubber block 422, the outer wall of the second extrusion ring 423, the inner wall of the second flange end cover 425 and the inner wall of the thrust bearing 426 are provided with an inner bushing 4210. The inner bushing 4210, the second annular rubber block 422 and the second extrusion ring 423 can rotate synchronously with the drill pipe. A second seal 4211 is provided between the second flange end cover 425 and the inner sleeve 4210 , between the rear outer convex ring of the second cylindrical piston 424 and the second cylindrical rigid body 421 , and between the rear end inner ring of the second cylindrical piston 424 and the inner wall of the second flange 428 .

[0065] The telescopic cylinder 7 includes a cylindrical inner flange rigid body 701 and a cylindrical outer flange rigid body 702 sleeved thereon, and a cylindrical piston 703 inserted in the annulus between the two from the rear; the front end flange of the inner flange rigid body 701 is fixedly connected to the front end of the outer flange rigid body 702 to form a front end sealed annulus; the piston 703 includes a head end of the piston 703, a rod body of the piston 703 and a flange of the piston 703 which are connected in sequence from front to back.

[0066] The front end flange of the inner flange rigid body 701 is connected to the first flange plate 326, and the piston 703 flange is connected to the second flange end cover 425; oil inlet and outlet ports 704 are provided at the front and rear positions of the side wall of the outer flange rigid body 702, and the oil inlet and outlet ports 704 are connected to the annulus between the inner flange rigid body 701 and the outer flange rigid body 702 and are respectively located in front and behind the head end of the piston 703, and a seal 705 is provided between the rod body of the piston 703 and the inner flange rigid body 701 and between the rod body of the piston 703 and the outer flange rigid body 702, and the seal 705 is located behind the rear oil inlet and outlet ports 704 and behind the head end of the piston 703; a piston seal 706 is provided between the head of the piston 703 and the inner flange rigid body 701 and between the outer flange rigid body 702.

[0067] In this embodiment, the coal mine underground compressed air drilling hole rotary seal anti-blowout dust removal automatic slag discharge system performs drilling construction, specifically including the following steps:

[0068] Step 1: Connect the orifice pipe, orifice cross, first sealing assembly, telescopic cylinder, second sealing assembly, filter negative pressure bag, and automatic slag discharge device in sequence;

[0069] Step 2: The first sealing component, the second sealing component, and the telescopic oil cylinder are connected to the oil supply pipeline, and the pneumatic motor is connected to the air supply pipeline; the filter-type negative pressure bag and the upper end of the circular steel pipe are connected to the main negative pressure pipeline;

[0070] Step 3: Open the air supply valve of the air supply pipeline to supply air to the pneumatic motor, and the flexible spiral slag discharger starts to rotate. The drilling slag generated during the drilling process rotates through the flexible spiral slag discharger and is transported to the drilling slag collection device through the slag discharge hose;

[0071] Step 4: Open the oil supply valve of the oil supply pipeline to supply oil to the second sealing assembly, and wait until the second annular rubber block is deformed and fits tightly with the drill pipe;

[0072] Step 5: Drilling begins. When the drilling rig feed device completes one stroke of drilling, the oil supply valve of the oil supply pipeline is opened to supply oil to the first sealing component. When the first annular rubber block is deformed and fits tightly with the drill pipe, the pressure relief valve of the oil supply pipeline is opened to relieve the pressure of the second sealing component. The second annular rubber block is reset and separated from the drill pipe. Under the action of the telescopic oil cylinder, the second sealing component returns to its original position.

[0073] Step 6: Open the oil supply valve of the oil supply pipeline to supply oil to the second sealing assembly. After the second annular rubber block is deformed and fits tightly with the drill pipe, open the pressure relief valve of the oil supply pipeline to relieve the pressure of the first sealing assembly. The first annular rubber block is separated from the drill pipe, and the next stroke drilling begins.

[0074] Step 7: Repeat steps 5 and 6 to complete the drilling construction.

[0075] The preferred embodiments of the present invention are described in detail above in conjunction with the accompanying drawings. However, the present invention is not limited to the specific details in the above embodiments. Within the technical concept of the present invention, a variety of simple modifications can be made to the technical solution of the present invention, and these simple modifications all belong to the protection scope of the present invention.

[0076] It should also be noted that the various specific technical features described in the above specific embodiments can be combined in any suitable manner without contradiction. In order to avoid unnecessary repetition, the present invention will not further describe various possible combinations.

[0077] In addition, various embodiments of the present invention may be arbitrarily combined, and as long as they do not violate the concept of the present invention, they should also be regarded as the contents disclosed by the present invention.

Claims

1. A coal mine underground compressed air drilling hole rotary seal anti-blowout dust removal automatic slag discharge system, characterized in that: It comprises an orifice tube (1), an orifice cross-piece (2), a first sealing component (3), a second sealing component (4), a filtering negative pressure bag (5), and an automatic slag discharge device (6); The orifice pipe (1), the orifice spool (2), the first sealing assembly (3), and the second sealing assembly (4) are arranged in sequence from the orifice to the rear and are sleeved outside the drill pipe; the front port of the orifice spool (2) is connected to the orifice pipe (1), the rear port is connected to the first sealing assembly (3), the upper port is connected to the filtering negative pressure bag (5), and the lower port is connected to the automatic slag discharge device (6); the first sealing assembly (3) and the second sealing assembly (4) can automatically seal the outer annulus of the drill pipe according to the dynamics of the drilling process To prevent gas and coal dust from overflowing; the second sealing component (4) can move forward with the drilling of the drill rod and move backward to reset after the drilling is completed; the filtering negative pressure bag (5) can filter the solid particles in the dust generated by drilling and introduce the filtered dust and gas into the main negative pressure pipeline (8) through the circular steel pipe (503) to achieve filtering dust removal and pre-extraction of gas from drilling dust and gas; the automatic slag discharge device (6) can fully enclosed and automatically transport the drilling slag that falls from the orifice four-way (2).

2. The coal mine underground compressed air drilling hole rotary seal anti-blowout dust removal automatic slag discharge system as claimed in claim 1, characterized in that: The first sealing component (3) and the second sealing component (4) are connected via plug-in connection, and the second sealing component (4) can be axially moved and reset via a reset spring (3110); The first sealing assembly (3) comprises a first cylindrical outer shell (311) and a first sealing inner cylinder (312) therein, and a first bearing (313) therebetween; a first expandable bladder (314) is provided on the inner wall of the first sealing inner cylinder (312); and a first sealing flannel (315) is provided on the outer side of the first expandable bladder (314); The second sealing assembly (4) comprises a second cylindrical outer shell (411) and a second sealing inner cylinder (412) therein, and a second bearing (413) therebetween; a second expandable bladder (414) is provided on the inner wall of the second sealing inner cylinder (412); and a second sealing flannel (415) is provided on the outer side of the second expandable bladder (414).

3. The coal mine underground compressed air drilling hole rotary seal anti-blowout dust removal automatic slag discharge system as claimed in claim 2, characterized in that: The front end of the first cylindrical outer shell (311) is connected to the rear end of the orifice cross-way (2) through a flange, the side wall is provided with a first air inlet (316), and the rear end side wall is provided with an annular groove (317) with a rear end opening; the first cylindrical outer shell (311) and the first sealing inner cylinder (312) are single-acting through the first bearing (313) and sealed through the first sealing ring (319); the side wall of the first sealing inner cylinder (312) is provided with a first inner air inlet (318) and can communicate with the first expandable bladder (314) and the first air inlet (316); The front end of the second cylindrical outer shell (411) can be inserted into the annular groove (317) and an axial return spring (3110) is provided between the front end and the bottom of the annular groove (317), and a second air inlet (416) is provided on the side wall; the second cylindrical outer shell (411) can move axially along the annular groove (317); the second cylindrical outer shell (411) and the second sealed inner cylinder (412) realize single motion through the second bearing (413) and realize sealing through the second sealing ring (418); the side wall of the second sealed inner cylinder (412) is provided with a second inner air inlet (417), and can be connected to the second expandable bladder (414) and the second air inlet (416).

4. The coal mine underground compressed air drilling hole rotary seal anti-blowout dust removal automatic slag discharge system as claimed in claim 3, characterized in that: The first expandable bladder (314) and the second expandable bladder (414) are made of a deformable material and can expand rapidly under the action of high-pressure gas, with a pressure bearing capacity of not less than 1Mpa and wear resistance; the first sealing velvet cloth (315) and the second sealing velvet cloth (415) are made of a soft velvet material and are wear-resistant.

5. The coal mine underground compressed air drilling hole rotary seal anti-blowout dust removal automatic slag discharge system as claimed in claim 1, characterized in that: The first sealing component (3) and the second sealing component (4) are connected via a telescopic oil cylinder (7), and the second sealing component (4) can be axially moved and reset via the telescopic oil cylinder (7); The first sealing assembly (3) comprises a first cylindrical rigid body (321) and a first annular rubber block (322) therein, a first extrusion ring (323) and a first cylindrical piston (324); a first flange end cover (325) is provided at the front end of the first cylindrical rigid body (321) and the first annular rubber block (322); and a first flange plate (326) is provided at the rear of the first cylindrical rigid body (321) and the first piston (703); The second sealing assembly (4) comprises a second cylindrical rigid body (421) and a second annular rubber block (422) therein, a second extrusion ring (423) and a second cylindrical piston (424); a second flange end cover (425) is provided at the front end of the second cylindrical rigid body (421); a thrust bearing (426) is provided between the second flange end cover (425) and the second annular rubber block (422); a thrust ball bearing (427) is provided between the second extrusion ring (423) and the second cylindrical piston (424); and a second flange plate (428) is provided at the rear of the second cylindrical rigid body (421) and the second piston (703).

6. The coal mine underground compressed air drilling hole rotary seal anti-blowout dust removal automatic slag discharge system as claimed in claim 5, characterized in that: The first flange end cover (325) is connected to the rear port of the orifice cross-way (2); the rear side wall of the first cylindrical rigid body (321) is provided with a first oil inlet and outlet (327); the first annular rubber block (322), the first extrusion ring (323) and the first cylindrical piston (324) are closely arranged in sequence from front to back; the rear outer convex ring and the rear inner ring of the first cylindrical piston (324) can form a first annular oil chamber between the first cylindrical rigid body (321) and the first flange (326); and the first annular oil chamber is communicated with the first oil inlet and outlet (327); hydraulic oil enters the first annular oil chamber to push the first extrusion ring (323) to squeeze the first annular rubber block (322) so that it expands and deforms radially and then seals with the drill pipe.

7. The coal mine underground compressed air drilling hole rotary seal anti-blowout dust removal automatic slag discharge system as claimed in claim 5, characterized in that: The rear side wall of the second cylindrical rigid body (421) is provided with a second oil inlet and outlet (429), the second annular rubber block (422), the second extrusion ring (423) and the second cylindrical piston (424) are closely arranged from front to back, and the rear outer convex ring and the rear inner ring of the second cylindrical piston (424) can form a second annular oil chamber with the second cylindrical rigid body (421) and the second flange (428), and the second annular oil chamber is in communication with the second oil inlet and outlet (429), and the hydraulic Oil enters the second annular oil chamber to push the second extrusion ring (423) to squeeze the second annular rubber block (422), causing it to expand radially and deform, and then seal with the drill pipe; an inner sleeve (4210) is provided on the outer wall of the second annular rubber block (422), the outer wall of the second extrusion ring (423), the inner wall of the second flange end cover (425), and the inner wall of the thrust bearing (426); the inner sleeve (4210), the second annular rubber block (422), and the second extrusion ring (423) can rotate synchronously with the drill pipe.

8. The coal mine underground compressed air drilling hole rotary seal anti-blowout dust removal automatic slag discharge system as claimed in claim 5, characterized in that: The telescopic oil cylinder (7) comprises an inner flange rigid body (701) and an outer flange rigid body (702) sleeved thereon, and a piston (703) inserted in the annulus between the two from the rear; the front end flange of the inner flange rigid body (701) is fixedly connected to the front end of the outer flange rigid body (702) to form an annulus with a front end seal; the piston (703) comprises a head end of the piston (703), a rod body of the piston (703) and a piston (703) flange which are connected in sequence from front to back; The front end flange of the inner flange rigid body (701) is connected to the first flange plate (326), and the piston (703) flange is connected to the second flange end cover (425); oil inlet and outlet ports (704) are provided at the front and rear positions of the side wall of the outer flange rigid body (702); the oil inlet and outlet ports (704) are connected to the annular space between the inner flange rigid body (701) and the outer flange rigid body (702) and are respectively located at the front and rear of the head end of the piston (703); a seal (705) is provided between the rod body of the piston (703) and the inner flange rigid body (701) and between the rod body and the outer flange rigid body (702); the seal (705) is located behind the oil inlet and outlet ports (704).

9. The coal mine underground compressed air drilling hole rotary seal anti-blowout dust removal automatic slag discharge system as claimed in claim 1, characterized in that: The filtering negative pressure bag (5) has two layers, the inner layer (501) is air-permeable and does not pass solid particles, and the outer layer (502) is air-impermeable; the upper port of the orifice cross-way (2) is connected to the space between the inner layer (501) and the outer layer (502); the circular steel pipe (503) extends from the inner layer (501) and is connected to the main negative pressure pipeline (8); and the side wall of the circular steel pipe (503) located in the inner layer (501) is provided with a mesh.

10. The coal mine underground compressed air drilling hole rotary seal anti-blowout dust removal automatic slag discharge system as claimed in claim 1, characterized in that: The automatic slag discharge device (6) comprises a slag discharge hose (601), a drilling slag collection port (602), a flexible spiral slag discharger (603), a pneumatic motor (604), and a drilling slag collection device (605); the drilling slag collection port (602) is connected to the slag discharge hose (601), and the upper end of the drilling slag collection port (602) is connected to the orifice 4-way (2) by plugging, the flexible spiral slag discharger (603) is arranged in the slag discharge hose (601), the pneumatic motor (604) can drive the flexible spiral slag discharger (603) to rotate, and the drilling slag collection device (605) is arranged at the end of the slag discharge hose (601).

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