Heavy type intelligent blowout prevention hole device for hydraulic jetting

Abstract

The invention discloses a heavy type intelligent hole spraying prevention device for hydraulic jetting, and relates to the technical field of hole spraying prevention during coal drilling, a slag baffle and a holding unit allowing a drill rod to penetrate through are arranged in a four-way pipe, when hole spraying occurs, the gas pressure in a drill hole rises, and the drill rod can penetrate through the slag baffle; gas in a drill hole is diffused to the position near the drill hole through a gap between the drill rod and the four-way pipe, when the concentration of methane near the drill hole reaches a preset threshold value of the methane sensor, the methane sensor sends an electric signal to the PLC control cabinet, the PLC control cabinet sends an electric signal to the electromagnetic valve, and the electromagnetic valve controls the holding unit to hold the drill rod tightly. The path that the gas in the drill hole continuously escapes into the roadway through the gap between the drill rod and the four-way pipe is cut off, and the technical problem that normal work in the roadway is affected due to the fact that the gas in the drill hole continuously escapes through the gap between the drill rod and the four-way pipe is solved; and meanwhile, the drill rod is quickly braked through secondary clamping of the holding unit, and a gap between the drill rod and the four-way pipe is cut off.

Description

Technical Field

[0001] The invention relates to the technical field of anti-blowout holes during coal drilling, in particular to a heavy-duty intelligent anti-blowout hole device for hydraulic jetting. Background Art

[0002] Coal is the main energy source in my country and supports the sustained and rapid development of the national economy. However, with the continuous increase in the depth of mine mining, the gas content and gas pressure of coal seams have increased sharply. In order to control coal seam gas, hydraulic permeability enhancement measures such as hydraulic punching and hydraulic cutting are usually adopted in conjunction with the construction of anti-burst drilling. Since the permeability enhancement process has a great influence on the fluctuation of the coal body around the borehole, it is easy to cause the rapid release of gas in the hole and form a gas torrent. The gas torrent prevents the coal powder from being discharged smoothly, forming a gush and escaping into the tunnel, which can easily cause the gas in the tunnel to exceed the limit and threaten the life safety and equipment safety of the workers near the borehole. In order to avoid the problem of excessive gas in the tunnel and threatening the life safety and equipment safety of the workers near the borehole, an automatic control system is usually used to detect the gas content in the tunnel.

[0003] For example, the Chinese patent with application publication number CN114673549A discloses an automatic control system and method for drilling blowout prevention. The system includes a slag removal water tank, a blowout prevention box, a drilling rig, a PLC intelligent control cabinet, a network switch and a coal mine information management and control platform. A hole blowout prevention device is set at the selected drilling position. A pressure sensor connected to the PLC intelligent control cabinet via a wire is provided near the hole casing connection of the hole blowout prevention device. An electric gate valve connected to the PLC intelligent control cabinet via a wire is provided on the inlet pipe connecting the slag removal water tank and the gas extraction main pipeline. The pressure sensor and the electric gate valve are respectively connected to the PLC intelligent control cabinet via a wire. The pressure sensor and the electric gate valve transmit information through the PLC intelligent control cabinet. When gas is ejected, the electric gate valve can act in time to quickly discharge the ejected gas; the accident record is then transmitted to the coal mine information management and control platform via the network switch. The problem that the existing drilling blowout prevention technology has a slow response speed and is prone to cause gas overlimit in the drilling field is solved.

[0004] Paragraph 0015 of the specification of the above-mentioned public document states that if dynamic phenomena such as drilling and spraying occur, the pressure in the three-way pipe of the orifice blowout prevention device will increase. When the pressure increase reaches 50kPa in a short period of time, the pressure sensor will send an alarm signal to the PLC control box, so that the PLC control box controls the electric gate valve on the extraction pipeline to fully open, so that the gas can be discharged from the main pipeline, avoiding excessive gas in the drilling field due to large-scale gas spraying. At the same time, the sprayed residue and water can be discharged to the blowout prevention box through the lower slag discharge pipe. When the value of the pressure sensor drops to normal, the pressure sensor sends a reset signal to the PLC control box, so that the PLC control box controls the electric gate valve to reset, ensuring the normal operation of the entire extraction system.

[0005] However, there is a problem in the actual use of the technology in the above-mentioned public documents. That is, when a blowout occurs, even after the PLC control system sends out an alarm signal, the gas in the borehole will escape into the tunnel through the gap between the drill rod and the four-way pipe, causing the gas content in the tunnel to continue to increase after the alarm signal is sent, and the sensing value of the methane sensor will continue to increase, affecting the work in the tunnel and being detrimental to the safe production of the coal mine. Summary of the invention

[0006] In view of the deficiencies in the above-mentioned background technology, the present invention proposes a heavy-duty intelligent anti-blowout hole device for hydraulic jetting, which solves the technical problem that gas in the borehole will continue to escape through the gap between the drill rod and the four-way pipe, affecting the normal work in the tunnel.

[0007] The technical solution of the present invention is implemented as follows: a heavy-duty intelligent blowout prevention hole device for hydraulic jetting includes a control component, a blowout prevention component adapted to a borehole, and a fixing component, the control component is connected to the blowout prevention component, and the blowout prevention component is connected to a drilling rig through a fixing component; the blowout prevention component includes a four-way pipe rotatably connected to a drill rod on the drilling rig, a casing that can be extended into the borehole is provided at the front end of the four-way pipe, a first sealing sleeve adapted to the borehole is provided on the casing, and a clamping unit that can clamp the drill rod for a second time is provided inside the four-way pipe; the control component includes a PLC control cabinet arranged in the tunnel and a methane sensor for detecting the methane concentration outside the borehole, and the PLC control cabinet is respectively connected to the methane sensor and the clamping unit.

[0008] Preferably, the control component includes a blowout preventer box, a gas extraction system and a drilling rig power supply arranged in the tunnel, the four-way pipe is provided with an extraction port and a slag discharge port, the extraction port and the slag discharge port are both connected to the blowout preventer box, the blowout preventer box is connected to the gas extraction system through an extraction pipeline, the extraction pipeline is provided with an online monitor for gas drilling parameters, and the methane sensor and the drilling rig power supply are respectively connected to the PLC control cabinet.

[0009] Preferably, the clamping unit includes an annular inner tube and a sealing block arranged inside the four-way pipe, the annular inner tube is connected to an external air source, the external air source is connected to a PLC control cabinet, a pneumatic telescopic rod is provided on the four-way pipe, the telescopic head of the pneumatic telescopic rod can extend into the four-way pipe along the circumferential direction, the telescopic head of the pneumatic telescopic rod is connected to the sealing block, and the pneumatic telescopic rod is connected to the external air source.

[0010] Preferably, a solenoid valve is provided on the connecting pipe between the annular inner tube and the external air source, the solenoid valve is connected to the pneumatic telescopic rod, and the solenoid valve is connected to the PLC control cabinet.

[0011] Preferably, the two sealing blocks are relatively arranged inside the four-way pipe, and two pneumatic telescopic rods are arranged on the corresponding four-way pipe; the sealing block is an arc-shaped sealing block, and the two pneumatic telescopic rods are respectively connected to the solenoid valve.

[0012] Preferably, a slag removal pipeline is provided on the blowout preventer box, a pneumatic butterfly valve is provided on the slag removal pipeline, and the pneumatic butterfly valve is connected to the solenoid valve.

[0013] Preferably, a slag stopper plate is provided inside the four-way pipe, and a slag stopper hole is provided on the slag stopper plate for the drill rod to pass through, the slag stopper hole and the annular inner tube are coaxially arranged, a fixed shell is provided at the tail end of the four-way pipe, and the sealing block is arranged between the slag stopper plate and the annular inner tube; the middle part of the slag stopper plate protrudes toward the front end of the four-way pipe, and the slag stopper hole is opened in the protruding part.

[0014] Preferably, a second sealing sleeve is provided inside the four-way pipe for the drill rod to pass through, and the second sealing sleeve is located between the sealing block and the slag stop plate; the outer diameter of the second sealing sleeve is larger than the diameter of the slag stop hole; a fixing plate for clamping the second sealing sleeve is provided inside the four-way pipe, and the fixing plate is fixedly arranged between the sealing block and the slag stop plate.

[0015] Preferably, the front end of the four-way pipe is connected to a rubber joint, and the rubber joint and one end of the sleeve close to the four-way pipe are connected to a sealing ball valve, and the rubber joint is connected to the sealing ball valve.

[0016] Preferably, the fixing assembly includes a connecting plate for connecting to the drilling rig, and the connecting plate is provided with a telescopic unit and a diagonal brace; the telescopic unit includes a telescopic sleeve and a telescopic head, and the telescopic head is extendable along the axial direction of the telescopic sleeve, the bottom surface of the telescopic sleeve is hinged to the connecting plate, one end of the diagonal brace is hinged to the connecting plate, and the other end is hinged to the side of the telescopic sleeve, the outside of the four-way pipe is connected to a side plate, and the telescopic head is connected to the side plate.

[0017] Beneficial effects of the present invention: the present invention is provided with a slag baffle and a clamping unit for the drill rod to pass through inside the four-way pipe, a methane sensor for detecting the methane concentration outside the borehole is arranged in the tunnel, and the PLC control cabinet is connected to the methane sensor and the clamping unit respectively. When a blowout occurs, the gas pressure in the borehole increases, and the gas in the borehole diffuses to the vicinity of the borehole through the gap between the drill rod and the four-way pipe. When the methane concentration near the borehole reaches the preset threshold of the methane sensor, the methane sensor sends an electrical signal to the PLC control cabinet, and the PLC control cabinet controls the clamping unit. The drill pipe is tightly held by the clamping unit to cut off the way for the gas in the borehole to continue to escape into the tunnel through the gap between the drill pipe and the four-way pipe, and the drill pipe is quickly braked by the secondary clamping of the clamping unit. At the same time, a first sealing sleeve matched with the borehole is provided on the outside of the casing. The first sealing sleeve and the clamping unit together seal the gas in the blowout prevention component and the borehole, solving the technical problem that the gas in the borehole will continue to escape through the gap between the drill pipe and the four-way pipe, affecting the normal work in the tunnel, avoiding the situation of excessive gas in the tunnel, and effectively preventing the occurrence of gas accidents. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the embodiments of the present invention, the accompanying drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings in the following description are only some embodiments of the present invention. For ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without paying any creative work.

[0019] Figure 1 It is a schematic diagram of the present invention.

[0020] Figure 2 It is a schematic diagram of the blowout prevention assembly of the present invention.

[0021] Figure 3 It is a cross-sectional view of the blowout prevention assembly of the present invention being sleeved with a drill pipe.

[0022] Figure 4 The figure is a schematic diagram of the connection between the pneumatic telescopic rod and the sealing block of the present invention.

[0023] Figure 5 It is a cross-sectional view of the one-way valve of the present invention.

[0024] In the figure: 1 four-way pipe, 2 drill pipe, 3 casing, 4 first sealing sleeve, 5 sealing ball valve, 6 extraction port, 7 slag discharge port, 8 slag blocking port, 9 second sealing sleeve, 10 annular inner tube, 11 fixed shell, 12 slag removal pipeline, 13 slag blocking plate, 14 air nozzle, 15 blowout preventer, 16 pneumatic butterfly valve, 17 methane sensor, 18 gas drilling parameter online monitor, 19 gas extraction system, 20 PLC control cabinet, 21 solenoid valve, 22 drilling rig power supply, 23 external gas source, 24 fixed plate, 25 sealing block, 26 pneumatic telescopic rod, 27 connecting plate, 28 telescopic unit, 29 telescopic sleeve, 30 side plate, 31 telescopic head, 32 diagonal brace, 33 rubber joint, 34 one-way valve, 35 drill bit, 36 water inlet, 37 water outlet. DETAILED DESCRIPTION

[0025] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. 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.

[0026] Embodiment 1, a heavy-duty intelligent anti-spray hole device for hydraulic jetting, such as Figure 1As shown, it includes a control component, a blowout prevention component adapted to the borehole and a fixing component, the control component is connected to the blowout prevention component, and the blowout prevention component is connected to the drilling rig through the fixing component; the blowout prevention component includes a four-way pipe 1 that can be rotatably connected to the drill rod 2 on the drilling rig, the front end of the four-way pipe 1 is provided with a casing 3 that can be extended into the borehole, the casing 3 is provided with a first sealing sleeve 4 adapted to the borehole, and the interior of the four-way pipe 1 is provided with a clamping unit that can clamp the drill rod 2 for a second time; the control component includes a PLC control cabinet 20 arranged in the tunnel and a methane sensor 17 for detecting the methane concentration outside the borehole, and the PLC control cabinet 20 is respectively connected to the methane sensor 17 and the clamping unit. A clamping unit is provided inside the four-way pipe for the drill rod 2 to pass through, a methane sensor 17 for detecting the methane concentration outside the borehole is provided in the tunnel, and the PLC control cabinet 20 is connected to the methane sensor 17 and the clamping unit respectively. When a blowout occurs, the gas pressure in the borehole increases, and the gas in the borehole enters the tunnel through the gap between the drill rod 2 and the four-way pipe 1. When the methane concentration in the tunnel reaches the preset threshold of the methane sensor 17, the methane sensor 17 sends an electrical signal to the PLC control cabinet 20, and the PLC control cabinet 20 controls the clamping unit to clamp the drill rod 2. Rod 2, cuts off the way for the gas in the borehole to continue to escape into the tunnel through the gap between the drill rod 2 and the four-way pipe 1, and uses the secondary clamping of the clamping unit to quickly brake the drill rod. At the same time, the outside of the casing 3 is provided with a first sealing sleeve 4 adapted to the borehole. The first sealing sleeve 4 and the clamping unit together seal the gas in the blowout prevention component and the borehole, avoiding the situation of excessive gas in the tunnel, effectively preventing the occurrence of gas accidents, and solving the technical problem that the gas in the borehole will continue to escape through the gap between the drill rod and the four-way pipe, affecting the normal work in the tunnel.

[0027] Embodiment 2, based on embodiment 1, a heavy-duty intelligent anti-spray hole device for hydraulic jetting, such as Figure 1As shown, the control assembly includes a blowout prevention box 15, a gas extraction system 19 and a drilling rig power supply 22 arranged in the tunnel. The four-way pipe 1 is provided with an extraction port 6 and a slag discharge port 7, and the extraction port 6 and the slag discharge port 7 are both connected to the blowout prevention box 15. The blowout prevention box 15 is connected to the gas extraction system 19 through an extraction pipeline, and the extraction pipeline is provided with a gas drilling parameter online monitor 18. The methane sensor 17 and the drilling rig power supply 22 are respectively connected to the PLC control cabinet 20. The blowout prevention box 15 is set to collect the gas in the borehole and the water slag produced by the borehole when a blowout occurs. When a blowout occurs, the blowout prevention box 15 provides a large gas buffer space, which reduces the impact on the blowout prevention device to a certain extent. The gas in the borehole is collected into the blowout prevention box 15 along the extraction port 6, and the water slag produced by the borehole is collected into the blowout prevention box 15 along the slag discharge port 7. The drilling rig power supply 22 provides electrical energy to the drilling motor adapted to the drill rod 2. The gas extraction system 19 of the present application is a system that utilizes gas extraction equipment to extract the gas in the blowout preventer box 15 and monitors the gas concentration through a gas drilling parameter online monitor 18, wherein the gas extraction equipment is an existing common equipment that can complete gas extraction, and the preferred gas extraction equipment is a negative pressure gas extraction equipment.

[0028] When a blowout occurs, the gas pressure in the borehole increases, and the gas in the borehole overflows the four-way pipe 1 through the gap between the drill pipe 2 and the four-way pipe 1 and diffuses along the borehole. When the methane concentration near the borehole reaches the preset threshold of the methane sensor 17, the methane sensor 17 sends an electrical signal to the PLC control cabinet 20, and the PLC control cabinet 20 controls the drilling rig power supply 22 to stop providing power to the drilling motor. At the same time, the PLC control cabinet 20 controls the clamping unit to expand toward the middle to clamp the drill pipe 2, cutting off the path for the gas in the borehole to continue to escape into the tunnel through the gap between the drill pipe 2 and the four-way pipe 1. At the same time, the outside of the casing 3 is provided with a first sealing sleeve 4 that is compatible with the borehole. The first sealing sleeve 4 and the clamping unit together seal the gas in the blowout prevention assembly and the borehole, and the gas can only be controlled by the gas extraction system 9 through the extraction port 6 and the blowout prevention box 15, thereby ultimately avoiding the situation where the gas exceeds the limit in the tunnel. After the blowout prevention box 15 receives the gas delivered from the extraction port 6 and the water slag discharged from the slag discharge port 7, after preliminary sedimentation and separation, the gas is extracted by the gas extraction system 9 through the extraction pipeline. A gas drilling parameter online monitor 18 is provided on the extraction pipeline. The gas drilling parameter online monitor 18 measures the gas extraction volume during the drilling and punching operation of the coal hole section in real time, providing a more detailed data basis for the evaluation of coal seam gas extraction compliance. The overall installation and use are convenient, meeting the needs of the drilling intelligent blowout prevention device under the new situation. The model of the gas drilling parameter online monitor 18 can be QT10-CJZ70.

[0029] Embodiment 3, based on embodiment 2, a heavy-duty intelligent anti-spray hole device for hydraulic jetting, such as Figure 1 , Figure 2 , Figure 3 and Figure 4 As shown, the clamping unit includes an annular inner tube 10 and a sealing block 25 arranged inside the four-way pipe 1, the annular inner tube 10 is connected to an external air source 23, and the external air source 23 is connected to the PLC control cabinet 20. The four-way pipe 1 is provided with a pneumatic telescopic rod 26, and the telescopic head of the pneumatic telescopic rod 26 can extend into the four-way pipe 1 along the circumferential direction. The telescopic head of the pneumatic telescopic rod 26 is connected to the sealing block 25, and the pneumatic telescopic rod 26 is connected to the external air source 23. The extension of the pneumatic telescopic rod 26 causes the sealing block 25 to move toward the center of the four-way pipe 1, that is, the sealing block 25 approaches the drill rod 2 inserted into the four-way pipe 1. When the pneumatic telescopic rod 26 is fully extended, the sealing block 25 fits with the drill rod 2 to limit the rotation of the drill rod 2. The annular inner tube 10 and the sealing block 25 both limit the rotation of the drill rod 2, that is, the secondary clamping of the drill rod 2 realizes the rapid braking of the drill rod 2. Moreover, the rotation restriction of the drill rod 2 by the sealing block 25 is much greater than the rotation restriction of the drill rod 2 by the annular inner tube 10, and the rotation restriction effect of the drill rod 2 after the sealing block 25 and the annular inner tube 10 are combined is much greater than the rotation restriction effect of the drill rod 2 after the two layers of annular inner tubes 10 are combined. The annular inner tube 10 of the present application acts on the gap between the drill rod 2 and the cross-tube 1, and the sealing block 25 plays a major role in restricting the rotation of the drill rod 2.

[0030] Embodiment 4, based on embodiment 3, a heavy-duty intelligent anti-spray hole device for hydraulic jetting, such as Figure 1 and Figure 3 As shown, the connecting pipes between the annular inner tube 10 and the external gas source 23 are provided with a solenoid valve 21, which is also connected to the pneumatic telescopic rod 26, and the solenoid valve 21 is connected to the PLC control cabinet 20. The annular inner tube 10 is provided with a gas nozzle 14, which is connected to the external gas source 23 through an air pipe, and the solenoid valve 21 is provided on the air pipe, and the solenoid valve 21 is also connected to the pneumatic telescopic rod 26. The PLC control cabinet 20 controls whether the external gas source 23 supplies gas to the annular inner tube 10 and the pneumatic telescopic rod 26 through the opening and closing of the solenoid valve 21, controls whether the annular inner tube 10 expands toward the middle and holds the drill pipe 2 tightly, and further controls whether the gas in the borehole is cut off from passing through the gap between the drill pipe 2 and the four-way pipe 1, and whether the pneumatic telescopic rod 26 is extended to make the sealing block 25 move toward the center of the four-way pipe 1 and quickly brake the drill pipe 2.

[0031] Embodiment 5, based on embodiment 4, a heavy-duty intelligent anti-spray hole device for hydraulic jetting, such as Figure 3 and Figure 4As shown, the two sealing blocks 25 are arranged relatively inside the four-way pipe 1, and two pneumatic telescopic rods 26 are arranged on the corresponding four-way pipe 1; the sealing blocks 25 are arc-shaped sealing blocks, and the two pneumatic telescopic rods 26 are respectively connected to the electromagnetic valve 21. The two relatively arranged sealing blocks 25 move towards each other to realize the sealing blocks 25 to hold the drill rod 2 tightly, thereby realizing the braking of the drill rod 2, and the two relatively arranged sealing blocks 25 move towards each other by the two relatively arranged pneumatic telescopic rods 26 extending towards each other, and the two pneumatic telescopic rods 26 are respectively connected to the electromagnetic valve 21 through air pipes.

[0032] Embodiment 6, based on any one of Embodiments 2 to 5, a heavy-duty intelligent anti-spray hole device for hydraulic jetting, such as Figure 1 As shown, the blowout prevention box 15 is provided with a slag removal pipeline 12, and the slag removal pipeline 12 is provided with a pneumatic butterfly valve 16, and the pneumatic butterfly valve 16 is connected to the solenoid valve 21. The slag removal pipeline 12 is provided to collect the water slag generated by drilling into the blowout prevention box 15, so as to facilitate the discharge of the water slag in the blowout prevention box 15. The pneumatic butterfly valve 16 is provided on the one hand to control the discharge of water slag, and on the other hand to keep the blowout prevention box 15 sealed to prevent gas from overflowing and facilitate the gas extraction system 19 to extract gas from the blowout prevention box 15. The slag removal pipeline 12 can be connected to a coal-water separation device or a long-distance pumping vehicle to prevent water slag from flowing into the tunnel, causing coal and water to flow across the drilling site, effectively improving the working environment. The PLC control cabinet 20 controls whether the external air source 23 supplies air to the annular inner tube 10, the pneumatic butterfly valve 16 and the pneumatic telescopic rod 26 by opening and closing the solenoid valve 21. When the external air source 23 supplies air to the pneumatic butterfly valve 16, the pneumatic butterfly valve 16 starts and closes the slag removal pipeline 12, so that the blowout preventer box 15 is sealed, so that the gas in the blowout preventer box 15 can be controllably extracted by the gas extraction system 9 through the extraction port 6.

[0033] Embodiment 7, based on embodiment 6, a heavy-duty intelligent anti-spray hole device for hydraulic jetting, such as Figure 3As shown, a slag blocking plate 13 is provided inside the four-way pipe 1, and a slag blocking hole 8 is provided on the slag blocking plate 13 for the drill rod 2 to pass through, and the slag blocking hole 8 and the annular inner tube 10 are coaxially arranged, and a fixed shell 11 is provided at the tail end of the four-way pipe 1, and the sealing block 25 is arranged between the slag blocking plate 13 and the annular inner tube 10; the middle part of the slag blocking plate 13 protrudes toward the front end of the four-way pipe 1, and the slag blocking hole 8 is opened at the protruding part. The slag blocking plate 13 is provided to block a small amount of water slag, gas and coal powder sprayed out along the gap between the four-way pipe 1 and the drill rod 2. The middle part of the slag blocking plate 13 protrudes toward the front end of the four-way pipe 1, that is, the protruding direction of the slag blocking plate 13 is opposite to the direction of overflow of water slag and gas in the borehole. When a blowout occurs, the slag blocking plate 13 protruding toward the front end of the four-way pipe 1 can directly withstand the impact of gas and coal powder in the hole, and can block part of the water slag, so that only a small amount of water slag, gas and coal powder can be sprayed out along the gap between the slag blocking hole 8 and the drill rod 2.

[0034] Embodiment 8, based on embodiment 7, a heavy-duty intelligent anti-spray hole device for hydraulic jetting, such as Figure 3 As shown, the interior of the cross-tube 1 is provided with a second sealing sleeve 9 through which the drill rod 2 can pass, and the second sealing sleeve 9 is located between the sealing block 25 and the slag plate 13; the outer diameter of the second sealing sleeve 9 is larger than the diameter of the slag hole 8; the interior of the cross-tube 1 is provided with a fixing plate 24 for clamping the second sealing sleeve 9, and the fixing plate 24 is fixedly arranged between the sealing block 25 and the slag plate 13. The second sealing sleeve 9 is provided to block a small amount of water slag, gas and coal powder sprayed along the gap between the slag hole 8 and the drill rod 2 again, so as to prevent the water slag and coal powder from reaching the gap between the annular inner tube 10 and the drill rod 2 and affecting the sealing effect of the annular inner tube 10 on the gas after expansion. The outer diameter of the second sealing sleeve 9 is larger than the diameter of the slag hole 8 to ensure that a small amount of water slag, gas and coal powder sprayed along the gap between the slag hole 8 and the drill rod 2 is blocked by the second sealing sleeve 9 as much as possible, so as to reduce the possibility that the water slag and coal powder pass through the second sealing sleeve 9 and reach the gap between the annular inner tube 10 and the drill rod 2. The fixing plate 24 is provided to further limit and fix the second sealing sleeve 9, so as to avoid the situation that the second sealing sleeve 9 moves and affects the blocking effect of the second sealing sleeve 9 on water slag and coal powder.

[0035] Embodiment 9, based on embodiment 8, a heavy-duty intelligent anti-spray hole device for hydraulic jetting, such as Figure 2 , Figure 3 and Figure 5As shown, the front end of the four-way pipe 1 is connected with a rubber joint 33, and the end of the casing 3 close to the four-way pipe 1 is connected with a sealing ball valve 5, and the rubber joint 33 is connected to the sealing ball valve 5. The rubber joint 33 is composed of a fabric-reinforced rubber part and a flat flexible joint, a sleeve metal flange or a threaded pipe flange, and is a joint used for pipeline vibration isolation, noise reduction, and displacement compensation. It is a pipeline joint with high elasticity, high air tightness, medium resistance and weather resistance. The rubber joint 33 is used in this application to flexibly connect the rigid four-way pipe 1 with the rigid sealing ball valve 5. When the drill rod 2 rotates, the impact on the casing 3 and the sealing ball valve 5 is transmitted to the four-way pipe 1 after passing through the rubber joint 5, which protects the service life of the four-way pipe 1 and the sealing ball valve 5. Because when the four-way pipe 1 is directly rigidly connected to the sealing ball valve 5, the impact on the casing 3 and the sealing ball valve 5 caused by the rotation of the drill rod 2 is directly transmitted to the four-way pipe 1, resulting in the rigid connection between the four-way pipe 1 and the casing 3. The situation is easy to be damaged.

[0036] The casing 3 and the sealing ball valve 5 are detachably connected by bolts, the rubber joint 33 and the sealing ball valve 5 are detachably connected by bolts, and the rubber joint 33 and the four-way pipe 1 are detachably connected by bolts. After the drilling is completed, after the drill rod 2 drives the drill bit 33 to complete the drilling, the bolts at the connection between the rubber joint 33 and the four-way pipe 1 are removed, the four-way pipe 1, the drill rod 2 and the drill bit 33 are pulled out of the borehole, the casing 3, the first sealing sleeve 4 and the sealing ball valve 5 are retained in the borehole, and the sealing ball valve 5 is closed at the same time, so that the borehole is in a sealed state, thereby avoiding the occurrence of spray holes in the borehole after the four-way pipe 1, the drill rod 2 and the drill bit 33 are pulled out of the borehole, threatening the life safety of workers and equipment safety near the borehole.

[0037] The drill rod 2 and the drill bit 33 are both hollow to facilitate water injection during the drilling process. In order to prevent the gas in the hole from leaking out along the water injection channel after the drilling is completed, a one-way valve 34 is arranged at the connection between the drill rod 2 and the drill bit 33, wherein the end of the one-way valve 34 close to the water inlet 36 is threadedly connected to the drill rod 2, and the end of the one-way valve 34 close to the water outlet 37 is threadedly connected to the drill bit 33. When the drill rod 2 and the drill bit 33 are connected through the one-way valve 34, only water can be injected into the water injection channel between the drill rod 2 and the drill bit 33, and gas will not leak out along the water injection channel, thereby greatly improving the sealing effect of the entire heavy-duty intelligent blowout prevention device.

[0038] Embodiment 10, based on embodiment 9, a heavy-duty intelligent anti-spray hole device for water jetting, such as Figure 1 , Figure 2 and Figure 3As shown, the fixing assembly includes a connecting plate 27 for connecting the drilling rig, and the connecting plate 27 is provided with a telescopic unit 28 and a diagonal brace 32; the telescopic unit 28 includes a telescopic sleeve 29 and a telescopic head 31, and the telescopic head 31 is arranged to be extended along the axial direction of the telescopic sleeve 29, the bottom surface of the telescopic sleeve 29 is hinged to the connecting plate 27, one end of the diagonal brace 32 is hinged to the connecting plate 27, and the other end is hinged to the side of the telescopic sleeve 29, and the outside of the four-way pipe 1 is connected with a side plate 30, and the telescopic head 31 is connected to the side plate 30. The setting of the fixing assembly is to fix the blowout prevention assembly of the present application on the drilling rig to ensure the stability of the blowout prevention assembly during use; the above-mentioned connecting plate 27 is connected to the drilling rig by bolts, and the telescopic unit 28 can be any one of a hydraulic cylinder, an electric pneumatic telescopic rod and a cylinder. Preferably, the telescopic unit 28 is a hydraulic cylinder, because the hydraulic cylinder works smoothly, is simple to control, and has a stronger bearing capacity. One end of the telescopic unit 28 is hinged to the connecting plate 27 and the other end is connected to the side plate 30. On the one hand, the distance between the telescopic unit 28 and the fixed shell 11 at the tail of the four-way pipe 1 can be adjusted by extending and retracting the telescopic unit 28. On the other hand, the angle of the entire blowout prevention assembly can be adjusted by hingedly connecting the telescopic unit 28 and the connecting plate 27, which facilitates the insertion of the blowout prevention assembly into the drill hole and improves the convenience of use of the entire device.

[0039] The heavy-duty intelligent blowout prevention device of the present application is called "heavy-duty" because the existing blowout prevention devices suitable for conventional underground drilling construction have a borehole diameter generally not exceeding 120 mm and are suitable for conventional underground layer drilling construction. The water pressure is relatively low and the flow rate is relatively small, generally 6~8 MPa, 100~150L / min, and the weight of the blowout prevention component is no more than 30kg. The heavy-duty intelligent blowout prevention device of the present application has a drilling hole diameter greater than 120mm, and even a drilling hole diameter of up to 153mm. The water pressure of the hydraulic jet is 20Mpa, 400~500L / min, and is suitable for areas with higher coal seam gas pressure and content. Since the water pressure and flow rate of the injection in the hole are relatively large, more coal seams are broken in the hole, and the speed and total amount of gas desorption are also relatively large, and the probability of high-intensity blowouts is also greater. The ability of heavy-duty blowout prevention to prevent high-intensity gas blowouts is also required to be stronger. Therefore, the size, thickness, strength of each component, and total weight of the heavy-duty blowout prevention device are also larger. The weight of the blowout prevention component of the heavy-duty intelligent blowout prevention device of the present application is greater than 100kg. Therefore, in order to ensure the stability of the blowout prevention component during use, the blowout prevention component of the present application is fixedly connected to the drilling rig through a fixing component.

[0040] When implementing Example 10, the above-mentioned blowout prevention assembly and control assembly are assembled in sequence. When in use, a hole of about 1m is first opened on the coal wall, and then the drill rod 2 is inserted along the blowout prevention assembly, and the blowout prevention assembly is fixedly connected to the drilling rig through the connecting plate 27. The distance between the telescopic unit 28 and the fixed shell 11 at the tail of the four-way pipe 1 is adjusted by extending and retracting the telescopic unit 28, and the angle of the entire blowout prevention assembly is adjusted by hinged connection between the telescopic unit 28 and the connecting plate 27, so as to facilitate the first sealing sleeve 4 to be sent into the borehole. The drilling rig is started, and the drill rod 2 is continuously sent into the borehole. Under the action of friction, the first sealing sleeve 4 is inserted into the borehole. The first sealing sleeve 4 is used to squeeze with the hole wall, the blowout prevention assembly is fixed on the borehole and the first sealing sleeve 4 seals the borehole opening, and then the water slag produced by the drilling enters the blowout prevention box 15 through the slag discharge port 7. After the blowout prevention box 15 receives the gas delivered by the extraction port 6 and the water slag discharged from the slag discharge port 7, after preliminary precipitation and separation, the gas gas is extracted by the gas extraction system 9 through the extraction pipeline. A gas drilling parameter online monitor 18 is provided on the extraction pipeline. The gas drilling parameter online monitor 18 measures the gas extraction amount in real time during the drilling and punching operations of the coal hole section; When a blowout occurs, the gas pressure in the borehole increases, and the gas in the borehole overflows the four-way pipe 1 through the gap between the drill pipe 2 and the four-way pipe 1 and diffuses along the borehole. When the methane concentration near the borehole reaches the preset threshold of the methane sensor 17, the methane sensor 17 sends an electrical signal to the PLC control cabinet 20, and the PLC control cabinet 20 controls the drilling rig power supply 22 to stop supplying power to the drilling motor. At the same time, the PLC control cabinet 20 controls the solenoid valve 21 to start, and the external air source 23 supplies air to the annular inner tube 10, the pneumatic butterfly valve 16 and the pneumatic telescopic rod 26, so that the annular inner tube 10 moves toward the center. The pneumatic expansion and clamping of the drill pipe 2 cuts off the escape path of the gas in the borehole through the gap between the drill pipe 2 and the four-way pipe 1, the pneumatic telescopic rod 26 extends to make the sealing block 25 move toward the center of the four-way pipe 1, and the drill pipe 2 is quickly braked. At the same time, the outside of the casing 3 is provided with a first sealing sleeve 4 adapted to the borehole. The first sealing sleeve 4 and the annular inner tube 10 together seal the gas in the blowout prevention assembly and the borehole. The pneumatic butterfly valve 16 closes the slag removal pipeline 12, and the gas can only be extracted by the gas extraction system 9 in a controllable manner through the extraction port 6 and the blowout prevention box 15, thereby ultimately avoiding the situation of excessive gas in the tunnel. After the blowout preventer 15 receives the gas delivered from the extraction port 6 and the water slag discharged from the slag discharge port 7, after preliminary sedimentation and separation, the gas is extracted by the gas extraction system 9 through the extraction pipeline. A gas drilling parameter online monitor 18 is provided on the extraction pipeline. The gas drilling parameter online monitor 18 measures the gas extraction volume in real time during the coal hole section drilling and punching operations.

[0041] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A heavy-duty intelligent anti-spray hole device for hydraulic jetting, characterized in that: The invention comprises a control component, a blowout prevention component adapted to a borehole, and a fixing component, wherein the control component is connected to the blowout prevention component, and the blowout prevention component is connected to a drilling rig via the fixing component; the blowout prevention component comprises a four-way pipe (1) rotatably connected to a drill rod (2), a casing (3) is provided at the front end of the four-way pipe (1), a first sealing sleeve (4) adapted to the borehole is provided on the casing (3), and a clamping unit capable of clamping the drill rod (2) for a second time is provided inside the four-way pipe (1); the control component comprises a PLC control cabinet (20) and a methane sensor (17) for detecting the methane concentration outside the borehole, and the PLC control cabinet (20) is respectively connected to the methane sensor (17) and the clamping unit.

2. The heavy-duty intelligent anti-spray hole device for water jetting according to claim 1 is characterized in that: The control assembly comprises a blowout prevention box (15), a gas extraction system (19) and a drilling rig power supply (22) arranged in the tunnel; a extraction port (6) and a slag discharge port (7) are provided on the four-way pipe (1); the extraction port (6) and the slag discharge port (7) are both connected to the blowout prevention box (15); the blowout prevention box (15) is connected to the gas extraction system (19) via an extraction pipeline; a gas drilling parameter online monitor (18) is provided on the extraction pipeline; the methane sensor (17) and the drilling rig power supply (22) are respectively connected to a PLC control cabinet (20).

3. The heavy-duty intelligent anti-spray hole device for water jetting according to claim 2 is characterized in that: The clamping unit comprises an annular inner tube (10) and a sealing block (25) arranged inside the four-way tube (1); the annular inner tube (10) is connected to an external air source (23); the external air source (23) is connected to a PLC control cabinet (20); a pneumatic telescopic rod (26) is provided on the four-way tube (1); a telescopic head of the pneumatic telescopic rod (26) can extend into the four-way tube (1) along a circumferential direction; the telescopic head of the pneumatic telescopic rod (26) is connected to the sealing block (25); and the pneumatic telescopic rod (26) is connected to the external air source (23).

4. The heavy-duty intelligent anti-spray hole device for water jetting according to claim 3 is characterized in that: A solenoid valve (21) is provided on the connecting pipe between the annular inner tube (10) and the external air source (23); the solenoid valve (21) is connected to the pneumatic telescopic rod (26); and the solenoid valve (21) is connected to the PLC control cabinet (20).

5. The heavy-duty intelligent anti-spray hole device for water jetting according to claim 4 is characterized in that: The two sealing blocks (25) are arranged opposite to each other inside the four-way pipe (1), and two pneumatic telescopic rods (26) are arranged on the corresponding four-way pipe (1); the sealing block (25) is an arc-shaped sealing block, and the two pneumatic telescopic rods (26) are respectively connected to the solenoid valve (21).

6. The heavy-duty intelligent anti-spray hole device for water jetting according to any one of claims 2 to 5, characterized in that: The blowout prevention box (15) is provided with a slag removal pipeline (12), the slag removal pipeline (12) is provided with a pneumatic butterfly valve (16), and the pneumatic butterfly valve (16) is connected to the solenoid valve (21).

7. The heavy-duty intelligent anti-spray hole device for water jetting according to claim 6 is characterized in that: A slag blocking plate (13) is provided inside the four-way pipe (1), and a slag blocking hole (8) is provided on the slag blocking plate (13) for the drill rod (2) to pass through. The slag blocking hole (8) and the annular inner tube (10) are coaxially arranged. A fixed shell (11) is provided at the tail of the four-way pipe (1), and the sealing block (25) is arranged between the slag blocking plate (13) and the annular inner tube (10). The middle part of the slag blocking plate (13) protrudes toward the front end of the four-way pipe (1), and the slag blocking hole (8) is provided at the protruding part.

8. The heavy-duty intelligent anti-spray hole device for water jetting according to claim 7 is characterized in that: A second sealing sleeve (9) is provided inside the four-way pipe (1) for the drill rod (2) to pass through, and the second sealing sleeve (9) is located between the sealing block (25) and the slag blocking plate (13); the outer diameter of the second sealing sleeve (9) is greater than the diameter of the slag blocking hole (8); a fixing plate (24) is provided inside the four-way pipe (1) for clamping the second sealing sleeve (9), and the fixing plate (24) is fixedly arranged between the sealing block (25) and the slag blocking plate (13).

9. The heavy-duty intelligent anti-spray hole device for water jetting according to claim 8, characterized in that: The front end of the four-way pipe (1) is connected to a rubber joint (33), and the end of the sleeve (3) close to the four-way pipe (1) is connected to a sealing ball valve (5), and the rubber joint (33) is connected to the sealing ball valve (5).

10. The heavy-duty intelligent anti-spray hole device for water jetting according to claim 9, characterized in that: The fixing assembly comprises a connecting plate (27) for connecting to a drilling rig, the connecting plate (27) being provided with a telescopic unit (28) and a diagonal brace (32); the telescopic unit (28) comprises a telescopic sleeve (29) and a telescopic head (31), the telescopic head (31) being arranged to be extendable along the axial direction of the telescopic sleeve (29), the bottom surface of the telescopic sleeve (29) being hinged to the connecting plate (27), one end of the diagonal brace (32) being hinged to the connecting plate (27), and the other end being hinged to the side surface of the telescopic sleeve (29), the outside of the cross-tube (1) being connected to a side plate (30), and the telescopic head (31) being connected to the side plate (30).

Images