Intelligent hole spraying prevention device based on PLC control system

Abstract

The utility model discloses an intelligent blowout prevention device based on a PLC control system, and relates to the technical field of blowout prevention during coal drilling, a slag baffle and an annular inner tube allowing a drill rod to penetrate through are arranged in a four-way pipe, the annular inner tube is connected with an external air source, a methane sensor used for detecting the concentration of methane near a drilled hole is arranged in a roadway, and the external air source is connected with an external air source. The PLC control cabinet is connected with the methane sensor and the external gas source, when hole spraying occurs, the pressure of gas in a drill hole is increased, the gas in the drill hole is diffused to the position near the drill hole through a gap between the drill rod and the four-way pipe, and after the concentration of the methane near the drill hole reaches a preset threshold value of the methane sensor, the PLC control cabinet controls the external gas source to supply gas to the annular inner tube. The annular inner tube expands towards the middle to tightly hold the drill rod, the path that gas in the drill hole continues to escape to the position near the drill hole through the gap between the drill rod and the four-way pipe is cut off, and the problem that normal work in a roadway is affected due to the fact that gas in the drill hole continues to escape through the gap between the drill rod and the four-way pipe is solved.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of the anti-blowout hole during coal drilling, in particular to an intelligent anti-blowout hole device based on a PLC control system. BACKGROUND

[0002] Coal is the main energy source in China, supporting the sustained and rapid development of the national economy. However, with the increasing depth of mine exploitation, the gas content and pressure of coal seams increase dramatically. To control the gas in coal seams, water jetting and water jetting and cutting are often used in conjunction with anti-outburst drilling to increase the permeability of the coal. Due to the significant impact of the permeability-increasing process on the coal body around the drilling, the gas in the hole is easily released rapidly, forming a gas gushing flow. The gas gushing flow prevents the coal dust from being discharged smoothly, causing it to spew and disperse into the roadway, which easily leads to gas overrun in the roadway, threatening the safety of workers and equipment near the drilling. To avoid the problem of gas overrun in the roadway and the threat to the safety of workers and equipment near the drilling, an automatic control system is usually used to detect the gas content in the roadway.

[0003] For example, Chinese Patent Publication No. CN114673549A discloses a drilling anti-blowout automatic control system and method. The system includes a slag removal tank, an anti-blowout tank, a drilling machine, a PLC intelligent control cabinet, a network switch, and a coal mine information management and control platform. A hole mouth anti-blowout device is arranged at the selected drilling position. The hole mouth anti-blowout device is provided with a pressure sensor connected to the PLC intelligent control cabinet via a wire near the connection between the hole mouth sleeve and the casing. An electric gate valve connected to the PLC intelligent control cabinet via a wire is arranged on the inlet pipe connected to the main gas extraction pipeline of the slag removal tank. 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 transmitted to the coal mine information management and control platform through the network switch. This solves the problem of slow reaction speed of existing drilling anti-blowout technology, which easily causes gas overrun in the drilling site.

[0004] According to paragraph 0015 of the specification of the above-mentioned disclosure, if drilling blowout or other dynamic phenomena occur, the pressure in the tee pipe of the hole mouth anti-blowout device will increase. When the pressure increases by 50kPa within 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 open completely, allowing the gas to be discharged from the main pipeline, thereby avoiding gas overrun in the drilling site due to the large amount of gas ejected. At the same time, the ejected residue and water can be discharged to the anti-blowout tank through the lower slag discharge pipe. When the value of the pressure sensor decreases 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, the technology of the above-mentioned disclosure has a problem in actual use, that is, when the blowout occurs, even if the PLC control system sends an alarm signal, the gas in the borehole will escape into the roadway through the gap between the drill rod and the cross pipe, causing the gas content in the roadway to still increase after the alarm signal is sent, the sensing value of the methane sensor still increases, affecting the normal work in the roadway, and being not conducive to the safety production of the coal mine. SUMMARY

[0006] In view of the problems in the prior art, the utility model provides an intelligent blowout prevention device based on a PLC control system, which solves the technical problem that the gas in the borehole continuously escapes through the gap between the drill rod and the cross pipe, affecting the normal work in the roadway.

[0007] The technical scheme of the utility model is as follows: an intelligent blowout prevention device based on a PLC control system, which comprises a control assembly, a blowout prevention assembly matched with a borehole and a fixing assembly, the control assembly is connected with the blowout prevention assembly, and the blowout prevention assembly is connected on a drilling machine through the fixing assembly; the blowout prevention assembly comprises a cross pipe rotatably connected with a drill rod, a sleeve is arranged at the front end of the cross pipe, a first sealing sleeve matched with the borehole is arranged on the sleeve, and a clamping unit for clamping the drill rod is arranged in the cross pipe; the control assembly comprises a PLC control cabinet and a methane sensor for detecting the methane concentration outside the borehole, and the PLC control cabinet is connected with the methane sensor and the clamping unit respectively.

[0008] Preferably, the control assembly comprises a blowout prevention box arranged in the roadway, a gas extraction system and a drilling machine power supply, the cross pipe is provided with an extraction port and a residue discharge port, the extraction port and the residue discharge port are connected with the blowout prevention box, the blowout prevention box is connected with the gas extraction system through an extraction pipeline, a gas borehole parameter on-line monitor is arranged on the extraction pipeline, and the methane sensor and the drilling machine power supply are connected with the PLC control cabinet respectively.

[0009] Preferably, the clamping unit comprises a ring-shaped inner tube through which the drill rod passes, the ring-shaped inner tube is arranged in the cross pipe, and an external air source is connected with the ring-shaped inner tube, and the external air source is connected with the PLC control cabinet.

[0010] Preferably, an electromagnetic valve is arranged on the connecting pipeline between the ring-shaped inner tube and the external air source, and the electromagnetic valve is connected with the PLC control cabinet.

[0011] Preferably, a residue removal pipeline is arranged on the blowout prevention box, a pneumatic butterfly valve is arranged on the residue removal pipeline, and the pneumatic butterfly valve is connected with the electromagnetic valve.

[0012] Preferably, the inside of the four-way pipe is provided with a slag baffle, the slag baffle is provided with a slag hole through which the drill rod passes, the slag hole and the annular inner tire are coaxially arranged, the tail of the four-way pipe is provided with a fixing shell, the middle part of the slag baffle protrudes towards the front end of the four-way pipe, and the protruding part is provided with the slag hole.

[0013] Preferably, the inside of the four-way pipe is provided with a second sealing sleeve through which the drill rod passes, and the second sealing sleeve is located between the annular inner tire and the slag baffle.

[0014] Preferably, the outer diameter of the second sealing sleeve is greater than the diameter of the slag hole.

[0015] Preferably, the inside of the four-way pipe is provided with a fixing plate for clamping the second sealing sleeve, and the fixing plate is fixedly arranged between the annular inner tire and the slag baffle.

[0016] Preferably, a rubber joint is arranged between the four-way pipe and the casing pipe, and flanges at two ends of the rubber joint are connected with the four-way pipe and the casing pipe respectively.

[0017] The utility model discloses a slag baffle and an annular inner tire through which the drill rod passes are arranged in the inside of the four-way pipe, the annular inner tire is connected with an external air source, a methane sensor is arranged near the drilling hole, a PLC control cabinet is connected with the methane sensor and the external air source respectively, when blowout occurs, the gas pressure in the drilling hole rises, the gas in the drilling hole diffuses to the drilling hole through the gap between the drill rod and the four-way pipe, when the methane concentration near the drilling hole reaches the threshold value preset by the methane sensor, the methane sensor sends an electric signal to the PLC control cabinet, the PLC control cabinet controls the external air source to supply air to the annular inner tire, so that the annular inner tire expands to the middle and tightly holds the drill rod, the way that the gas in the drilling hole continues to diffuse to the drilling hole through the gap between the drill rod and the four-way pipe is cut off, meanwhile, the outside of the casing pipe is provided with a first sealing sleeve matched with the drilling hole, and the first sealing sleeve and the annular inner tire jointly seal the gas in the blowout preventer assembly and the drilling hole, thereby avoiding the gas in the drilling hole from diffusing to the roadway and causing the gas in the roadway to exceed the limit, and effectively preventing the gas accident from occurring. BRIEF DESCRIPTION OF DRAWINGS

[0018] In order to more clearly illustrate the embodiments of the utility model, the drawings needed in the embodiment description will be briefly introduced, and obviously, the drawings in the following description are only some embodiments of the utility model, and other drawings can be obtained by those skilled in the art without creative labor.

[0019] Figure 1 It is a schematic view of the utility model.

[0020] Figure 2 It is a side view of the blowout preventer assembly of the utility model.

[0021] Figure 3 Figure is the sectional view of the blowout preventer assembly and the drill pipe sleeve connection.

[0022] In the figure: 1 four-way pipe, 2 drill pipe, 3 casing, 4 first sealing sleeve, 5 rubber joint, 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 cock, 15 blowout preventer box, 16 pneumatic butterfly valve, 17 methane sensor, 18 methane sensor, 19 gas extraction system, 20 PLC control cabinet, 21 solenoid valve, 22 drilling machine power supply, 23 external air source, 24 fixed plate. DETAILED DESCRIPTION

[0023] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0024] Embodiment 1, an intelligent blowout preventer device based on a PLC control system, as shown in Figure 1 and Figure 3As shown, including control components, with the drilling adapter blowout preventer assembly and fixed components, control components and blowout preventer assembly connected, blowout preventer assembly is connected to the drilling rig through the fixed components; the blowout preventer assembly includes a swivel connection with the drill pipe 2 four-way pipe 1, four-way pipe 1 front end provided with a sleeve 3, the sleeve 3 is provided with a first sealing sleeve 4 adapted to the drilling, the four-way pipe 1 is provided with a clamping unit that can be clamped drill pipe 2; the control assembly includes PLC control cabinet 20 and methane sensor 17 for detecting the methane concentration outside the drilling, PLC control cabinet 20 is connected with methane sensor 17 and clamping unit respectively. In the four-way pipe 1 inside the clamping unit for drill pipe, the roadway is provided for detecting the methane concentration outside the drilling methane sensor 17, PLC control cabinet 20 is connected with methane sensor 17 and clamping unit respectively, when the blowout occurs, the drilling gas pressure rises, the drilling gas through the gap between the drill pipe 2 and four-way pipe 1 diffusion to the drilling near, when the drilling near methane concentration reaches the threshold value of methane sensor 17, methane sensor 17 sends electrical signal to PLC control cabinet 20, PLC control cabinet 20 control clamping unit clamping drill pipe 2, cut off the drilling gas continues to diffuse into the roadway through the gap between the drill pipe 2 and four-way pipe 1 way, while the sleeve 3 is provided with a first sealing sleeve 4 adapted to the drilling, the first sealing sleeve 4 and clamping unit together make the gas is sealed in the blowout preventer assembly and drilling, solve the drilling gas will continue to diffuse through the gap between the drill pipe and four-way pipe, affect the normal work of the roadway technical problem, avoid the gas overrun in the roadway, effectively prevent the occurrence of gas accident.

[0025] Wherein, four-way pipe 1 refers to the tubular body of the blowout preventer assembly of the present application, is a tubular structure with one inlet and three outlets. Preferably, the methane sensor 17 is suspended above the drilling for detecting the methane concentration near the drilling, when the methane sensor 17 detects the methane concentration near the drilling reaches the threshold value of methane sensor 17, methane sensor 17 sends electrical signal to PLC control cabinet 20, so that the annular tire 10 to the middle of the inflation clamping drill pipe 2, cut off the drilling gas through the gap between the drill pipe 2 and four-way pipe 1 diffusion into the roadway way, completely seal the gas in the blowout preventer assembly and drilling, avoid the gas diffusion into the roadway caused by the roadway gas overrun, truly realize the intelligent blowout, PLC control cabinet 20 control action is rapid and reliable, blowout effect is good, ensure the safety of the work environment. Methane sensor 17 can be a methane sensor with alarm, when the methane sensor 17 detects the methane concentration near the drilling reaches the threshold value of methane sensor 17, the alarm gives an alarm to remind. When the annular tire 10 to the middle of the inflation clamping drill pipe 2, cut off the drilling gas through the gap between the drill pipe 2 and four-way pipe 1 at the same time will drill pipe 2 rapid braking.

[0026] Embodiment 2, on the basis of embodiment 1, an intelligent blowout prevention device based on a PLC control system, as shown in Figure 1 、 Figure 2 and Figure 3 , the control assembly comprises a blowout prevention box 15, a gas extraction system 19 and a drilling machine power supply 22 arranged in the roadway, the four-way pipe 1 is provided with an extraction port 6 and a residue discharge port 7, the extraction port 6 and the residue discharge port 7 are connected with the blowout prevention box 15, the blowout prevention box 15 is connected with the gas extraction system 19 through an extraction pipeline, the extraction pipeline is provided with a gas drilling parameter on-line monitor 18, the methane sensor 17 and the drilling machine power supply 22 are connected with the PLC control cabinet 20. The blowout prevention box 15 is arranged to collect the gas in the borehole and the water residue generated by the borehole when blowout occurs. When 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, the water residue generated by the borehole is collected into the blowout prevention box 15 along the residue discharge port 7, and the drilling machine power supply 22 provides power for the drilling motor matched with the drill pipe 2. The gas extraction system 19 of the present application is a device for extracting the gas in the blowout prevention box 15 and monitoring the concentration of the gas through the gas drilling parameter on-line monitor 18, wherein the gas extraction device is a common existing device, which can complete gas extraction, and preferably the gas extraction device is a negative pressure gas extraction device.

[0027] When blowout occurs, the gas pressure in the borehole rises, 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 value of the methane sensor 17, the methane sensor 17 sends an electric signal to the PLC control cabinet 20, the PLC control cabinet 20 controls the drilling machine power supply 22 to stop providing power for the drilling motor, and at the same time, the PLC control cabinet 20 controls the external gas source 23 to supply gas to the annular inner tube 10, so that the annular inner tube 10 expands towards the middle and tightly holds the drill pipe 2, cutting off the way for the gas in the borehole to escape into the roadway through the gap between the drill pipe 2 and the four-way pipe 1, and at the same time, the outer part of the casing 3 is provided with a first sealing sleeve 4 matched with 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, which can only be extracted by the gas extraction system 9 through the extraction port 6 and the blowout prevention box 15, finally avoiding the situation of gas overrun in the roadway. After receiving the gas delivered by the extraction port 6 and the water residue discharged by the residue discharge port 7, the blowout prevention box 15 is subjected to preliminary sedimentation and separation, the gas is extracted by the gas extraction system 9 through the extraction pipeline, the gas drilling parameter on-line monitor 18 is arranged on the extraction pipeline, the gas drilling parameter on-line monitor 18 measures the gas extraction amount in the process of drilling and punching in the coal hole section in real time, providing more detailed data basis for the evaluation of coal seam gas extraction, and the overall installation and use are convenient, meeting the needs of the intelligent blowout prevention device for boreholes under the new situation.

[0028] Example 3, on the basis of example 2, an intelligent blowout prevention device based on PLC control system, as shown in Figure 1 、 Figure 2 and Figure 3 , the embrace unit includes a ring-shaped inner tube 10 through which the drill pipe 2 passes, the ring-shaped inner tube 10 is arranged in the four-way pipe 1, the ring-shaped inner tube 10 is connected with an external air source 23, the external air source 23 is connected with the PLC control cabinet 20. Wherein the ring-shaped inner tube 10 is provided with an air nozzle 14, the air nozzle 14 is connected with the external air source 23 through an air pipe, the air pipe is provided with the electromagnetic valve 21, the PLC control cabinet 20 controls whether the external air source 23 supplies air to the ring-shaped inner tube 10 through the opening and closing of the electromagnetic valve 21, controls whether the ring-shaped inner tube 10 expands to the middle to embrace the drill pipe 2, and further controls whether the gas in the borehole is cut off to diffuse to the vicinity of the borehole through the gap between the drill pipe 2 and the four-way pipe 1. When blowout occurs, the gas pressure in the borehole rises, the gas in the borehole diffuses to the vicinity of the borehole through the gap between the drill pipe 2 and the four-way pipe 1, when the methane concentration in the vicinity of the borehole reaches the threshold value preset by the methane sensor 17, the methane sensor 17 sends an electric signal to the PLC control cabinet 20, the PLC control cabinet 20 controls the external air source 23 to supply air to the ring-shaped inner tube 10, so that the ring-shaped inner tube 10 expands to the middle to embrace the drill pipe 2, cutting off the way for the gas in the borehole to continue to diffuse to the vicinity of the borehole 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 matched with the borehole, the first sealing sleeve 4 and the ring-shaped inner tube 10 together seal the gas in the blowout prevention assembly and the borehole, avoiding the situation that the gas in the roadway exceeds the limit, effectively preventing the occurrence of gas accidents.

[0029] Example 4, on the basis of example 3, an intelligent blowout prevention device based on PLC control system, as shown in Figure 1 , the connecting pipeline between the ring-shaped inner tube 10 and the external air source 23 is provided with an electromagnetic valve 21, the electromagnetic valve 21 is connected with the PLC control cabinet 20. Wherein the ring-shaped inner tube 10 is provided with an air nozzle 14, the air nozzle 14 is connected with the external air source 23 through an air pipe, the air pipe is provided with the electromagnetic valve 21, the electromagnetic valve 21 is also connected with the pneumatic telescopic rod 26, the PLC control cabinet 20 controls whether the external air source 23 supplies air to the ring-shaped inner tube 10 and the pneumatic telescopic rod 26 through the opening and closing of the electromagnetic valve 21, controls whether the ring-shaped inner tube 10 expands to the middle to embrace the drill pipe 2, and further controls whether the gas in the borehole is cut off to diffuse to the vicinity of the borehole through the gap between the drill pipe 2 and the four-way pipe 1.

[0030] Example 5, on the basis of example 4, an intelligent blowout prevention device based on PLC control system, as shown in Figure 1As shown, the blowout preventer box 15 is provided with a deslagging pipeline 12, the deslagging pipeline 12 is provided with a pneumatic butterfly valve 16, the pneumatic butterfly valve 16 is connected with a solenoid valve 21. The deslagging pipeline 12 is provided to collect the water slag generated by drilling into the blowout preventer box 15, and then facilitate the discharge of the water slag in the blowout preventer box 15. The pneumatic butterfly valve 16 is provided to control the discharge of the water slag, and to keep the blowout preventer box 15 sealed to avoid gas overflow and facilitate the gas extraction system 19 to extract the gas in the blowout preventer box 15. The deslagging pipeline 12 can be connected with a coal-water separation device or a long-distance pumping vehicle to avoid the water slag flowing into the roadway, causing the coal water to flow horizontally at the drilling site, and 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 and the pneumatic butterfly valve 16 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 is started and the deslagging pipeline 12 is closed, so that the blowout preventer box 15 is sealed, and the gas in the blowout preventer box 15 can be extracted by the gas extraction system 9 through the extraction port 6 in a controllable manner.

[0031] In the embodiment 1~5, on the basis of any one of the embodiments, a kind of intelligent blowout preventer hole device based on PLC control system, as shown in Figure 3 As shown, the four-way pipe 1 is provided with a deslagging plate 13 in the inside, the deslagging plate 13 is provided with a deslagging hole 8 for the drill rod 2 to pass through, the deslagging hole 8 and the annular inner tube 10 are coaxially arranged, the tail of the four-way pipe 1 is provided with a fixed shell 11, the middle part of the deslagging plate 13 protrudes towards the front end of the four-way pipe 1, and the protruding part is provided with the deslagging hole 8. The middle part of the deslagging plate 13 protrudes towards the front end of the four-way pipe 1, that is, the protruding direction of the deslagging plate 13 is opposite to the direction of water slag and gas overflow in the drill hole. When blowout occurs, the deslagging plate 13 protruding towards the front end of the four-way pipe 1 can directly bear 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 deslagging hole 8 and the drill rod 2.

[0032] In the embodiment 6, on the basis of the embodiment 6, a kind of intelligent blowout preventer hole device based on PLC control system, as shown in Figure 3 As shown, the four-way pipe 1 is provided with a second sealing sleeve 9 in the inside, the second sealing sleeve 9 is located between the annular inner tube 10 and the deslagging plate 13. The second sealing sleeve 9 is provided to block the small amount of water slag, gas and coal powder sprayed out along the gap between the deslagging hole 8 and the drill rod 2 again, to avoid the water slag and coal powder reaching the gap between the annular inner tube 10 and the drill rod 2 to affect the sealing effect of the annular inner tube 10 after inflation.

[0033] In the embodiment 7, on the basis of the embodiment 7, a kind of intelligent blowout preventer hole device based on PLC control system, as shown in Figure 3As shown, the outer diameter of the second sealing sleeve 9 is greater than the diameter of the slag hole 8. The outer diameter of the second sealing sleeve 9 is greater 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 pipe 2 is blocked by the second sealing sleeve 9 as much as possible, reducing the possibility of water slag and coal powder passing through the second sealing sleeve 9 to the gap between the annular inner tube 10 and the drill pipe 2.

[0034] Embodiment 9, on the basis of embodiment 8, an intelligent blowout prevention hole device based on a PLC control system, as shown in Figure 3 As shown, the four-way pipe 1 is internally provided with a fixing plate 24 for clamping the second sealing sleeve 9, and the fixing plate 24 is fixedly arranged between the annular inner tube 10 and the slag baffle 13. The fixing plate 24 is arranged to further position and fix the second sealing sleeve 9, avoiding the situation that the movement of the second sealing sleeve 9 affects the blocking effect of the second sealing sleeve 9 on water slag and coal powder.

[0035] Embodiment 10, on the basis of embodiment 9, an intelligent blowout prevention hole device based on a PLC control system, as shown in Figure 2 and Figure 3 As shown, the four-way pipe 1 and the casing 3 are provided with a rubber joint 5, and the flanges at both ends of the rubber joint 5 are connected with the four-way pipe 1 and the casing 3 respectively. The rubber joint 5 is composed of a fabric-reinforced rubber piece, a flat-shaped union joint, a metal flange or a threaded pipe flange, and is used for pipe vibration isolation and noise reduction and displacement compensation. It is a pipe joint with high elasticity, high air tightness, medium resistance and weather resistance. The rubber joint 5 is used to flexibly connect the rigid four-way pipe 1 and the rigid casing 3 in the present application. When the drill pipe 2 rotates, the impact on the casing 3 is transmitted to the four-way pipe 1 through the rubber joint 5, protecting the service life of the four-way pipe 1 and the casing 3. When the four-way pipe 1 and the casing 3 are directly and rigidly connected, the impact on the casing 3 caused by the rotation of the drill pipe 2 is directly transmitted to the four-way pipe 1, which easily causes damage to the rigid connection between the four-way pipe 1 and the casing 3.

[0036] Preferably, the first sealing sleeve 4 is conical, and the first sealing sleeve 4 is made of rubber. The conical first sealing sleeve 4 is used to continuously feed the drill pipe 2 into the hole during drilling, and under the action of friction, the conical first sealing sleeve 4 is extruded with the hole wall, fixing the entire blowout prevention assembly at the drill hole opening and sealing the drill hole opening with the first sealing sleeve 4, preventing the gas from being directly sprayed out of the hole opening during blowout.

[0037] When the embodiment 10 is implemented, the blowout preventer assembly and the control assembly are assembled in sequence, in use, a hole of about 1m is first opened on the coal wall, then the drill pipe 2 is inserted along the blowout preventer assembly, the first sealing sleeve 4 is sent into the drill hole, and the drill pipe 2 continuously sends the drill into the drill hole during drilling, under the action of friction, the first sealing sleeve 4 is extruded with the hole wall, the blowout preventer assembly is fixed on the drill hole, and the first sealing sleeve 4 seals the drill hole orifice, then the water slag generated by the drill hole enters the blowout preventer box 15 through the slag discharge port 7, after the blowout preventer box 15 receives the extraction port 6 and the gas and the water slag discharged from the slag discharge port 7, preliminary sedimentation separation is performed, the gas is extracted by the gas extraction system 9 through the extraction pipeline, and the gas drilling parameter on-line monitor 18 is arranged on the extraction pipeline.

[0038] When the blowout occurs, the gas in the drill hole is overflowed through the gap between the drill pipe 2 and the four-way pipe 1 and diffused along the drill hole, when the methane concentration near the drill hole reaches the threshold value preset by the methane sensor 17, the methane sensor 17 sends an electric signal to the PLC control cabinet 20, the PLC control cabinet 20 controls the drill machine power supply 22 to stop providing power to the drill hole motor, at the same time, the PLC control cabinet 20 controls the electromagnetic valve 21 to start, the external air source 23 supplies air to the annular inner tube 10 and the pneumatic butterfly valve 16, so that the annular inner tube 10 is inflated to the middle to tightly hold the drill pipe 2, the way of the gas in the drill hole escaping through the gap between the drill pipe 2 and the four-way pipe 1 is cut off, at the same time, the outer portion of the casing 3 is provided with the first sealing sleeve 4 matched with the drill hole, the first sealing sleeve 4 and the annular inner tube 10 together seal the gas in the blowout preventer assembly and the drill hole, the pneumatic butterfly valve 16 is closed, the slag removal pipeline 12 can only be extracted through the extraction port 6 and the gas extraction system 9 controlled by the blowout preventer box 15, and finally the gas overlimit in the roadway is avoided. After the blowout preventer box 15 receives the extraction port 6 and the gas and the water slag discharged from the slag discharge port 7, preliminary sedimentation separation is performed, the gas is extracted by the gas extraction system 9 through the extraction pipeline, and the gas drilling parameter on-line monitor 18 is arranged on the extraction pipeline.

[0039] The above merely describes the preferred embodiments of the utility model and is not used to limit the utility model, any modification, equivalent replacement, improvement and the like made within the spirit and principle of the utility model should be included in the protection scope of the utility model.

Claims

1. An intelligent blowout preventer device based on a PLC control system, characterized in that, The application relates to a drilling device, which comprises a control assembly, a blowout-preventing assembly matched with a drilling hole and a fixing assembly, the control assembly is connected with the blowout-preventing assembly, the blowout-preventing assembly is connected on a drilling machine through the fixing assembly; the blowout-preventing assembly comprises a cross pipe (1) rotatably connected with a drill rod (2), a sleeve (3) arranged at the front end of the cross pipe (1), a first sealing sleeve (4) matched with the drilling hole arranged on the sleeve (3), and a clamping unit arranged in the cross pipe (1) and capable of clamping the drill rod (2); the control assembly comprises a PLC control cabinet (20) and a methane sensor (17) used for detecting the methane concentration outside the drilling hole, and the PLC control cabinet (20) is connected with the methane sensor (17) and the clamping unit respectively.

2. The intelligent blowout preventer device based on PLC control system according to claim 1, characterized in that: The control assembly comprises a blowout-preventing box (15) arranged in a roadway, a gas extraction system (19) and a drilling machine power supply (22), the cross pipe (1) is provided with an extraction opening (6) and a residue discharging opening (7), the extraction opening (6) and the residue discharging opening (7) are connected with the blowout-preventing box (15), the blowout-preventing box (15) is connected with the gas extraction system (19) through an extraction pipeline, the extraction pipeline is provided with a gas drilling parameter on-line monitor (18), and the methane sensor (17) and the drilling machine power supply (22) are connected with the PLC control cabinet (20) respectively.

3. The intelligent blowout preventer device based on PLC control system according to claim 2, characterized in that: The clamping unit comprises a ring-shaped inner tube (10) through which the drill rod (2) passes, the ring-shaped inner tube (10) is arranged in the cross pipe (1), and the ring-shaped inner tube (10) is connected with an external air source (23); the external air source (23) is connected with the PLC control cabinet (20).

4. The intelligent blowout preventer device based on PLC control system according to claim 3, characterized in that: An electromagnetic valve (21) is arranged on a connecting pipeline between the ring-shaped inner tube (10) and the external air source (23), and the electromagnetic valve (21) is connected with the PLC control cabinet (20).

5. The intelligent blowout preventer device based on PLC control system according to claim 4, characterized in that: A residue removing pipeline (12) is arranged on the blowout-preventing box (15), a pneumatic butterfly valve (16) is arranged on the residue removing pipeline (12), and the pneumatic butterfly valve (16) is connected with the electromagnetic valve (21).

6. The intelligent blowout preventer device based on PLC control system according to any one of claims 1-5, characterized in that: The cross pipe (1) is internally provided with a residue blocking plate (13), the residue blocking plate (13) is provided with a residue blocking hole (8) through which the drill rod (2) passes, the residue blocking hole (8) and the ring-shaped inner tube (10) are coaxially arranged, the tail part of the cross pipe (1) is provided with a fixing shell (11), the middle part of the residue blocking plate (13) protrudes towards the front end of the cross pipe (1), and the residue blocking hole (8) is arranged on the protruding part.

7. The intelligent blowout preventer device based on PLC control system according to claim 6, characterized in that: The cross pipe (1) is internally provided with a second sealing sleeve (9) through which the drill rod (2) passes, and the second sealing sleeve (9) is arranged between the ring-shaped inner tube (10) and the residue blocking plate (13).

8. The intelligent blowout preventer device based on PLC control system according to claim 7, characterized in that: The outer diameter of the second sealing sleeve (9) is larger than the diameter of the residue blocking hole (8).

9. The intelligent blowout preventer device based on PLC control system according to claim 8, characterized in that: The cross pipe (1) is internally provided with a fixing plate (24) used for clamping the second sealing sleeve (9), and the fixing plate (24) is fixedly arranged between the ring-shaped inner tube (10) and the residue blocking plate (13).

10. The intelligent blowout preventer device based on PLC control system according to claim 9, characterized in that: A rubber joint (5) is arranged between the cross pipe (1) and the sleeve (3), and the flanges at the two ends of the rubber joint (5) are connected with the cross pipe (1) and the sleeve (3) respectively.

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