Intelligent safety protection device for coal mine drilling construction

Abstract

The present application relates to the technical field of coal mining, in particular to an intelligent safety protection device for coal mine drilling construction, which mainly solves the technical problems of poor protection effect and certain hysteresis of the existing coal mine drilling construction protection device. The device comprises an orifice sealing mechanism, a pressure sensing shunt mechanism, a gas slag separation mechanism and a control mechanism. The orifice sealing mechanism comprises a hole protection pipe, a plugging air bag, a sealing cover and a one-way valve. The pressure sensing shunt mechanism comprises a bracket, a multi-way pipe, a pressure sensor and a plugging block. The gas slag separation mechanism comprises a box body, a first bellows, a second bellows, a third bellows, a fourth bellows, a concentration sensor and a flow sensor. The control mechanism comprises an air control box and an electric control box. The device can improve the sealing performance between the hole protection pipe and the drilling hole, and between the hole protection pipe and the drill pipe, thereby improving the protection performance of the device. At the same time, the device can automatically perform corresponding protection operations when the gas is sprayed, without human intervention, and has good real-time performance.

Description

Technical Field

[0001] This invention relates to the field of coal mining technology, and in particular to an intelligent safety protection device for coal mine drilling operations. Background Technology

[0002] To ensure the safety of coal mining, gas drainage boreholes must first be drilled underground to extract the gas contained in the coal seam, allowing the gas pressure to be released in advance. When the gas content in the coal seam exceeds the critical value and the gas pressure is high, the drilling will disrupt the original stress balance of the coal seam, causing the gas to move rapidly into the borehole space under the drive of the pressure difference, resulting in a gas blowout.

[0003] Existing borehole protection devices generally consist of a sealing structure, a borehole protector, a multi-way connector, and a dynamic sealing structure for the drill rod. The borehole protector is inserted into the borehole and sealed to the borehole opening by the sealing structure. The multi-way connector connects to the borehole protector and is equipped with an extraction port and a slag discharge port. The extraction port connects to a gas extraction system, and the slag discharge port connects to a water and slag collection system. The drill rod passes through the multi-way connector and the borehole protector, and the drill rod and the multi-way connector are sealed by the dynamic sealing structure. When a gas eruption occurs, gas carrying water, coal slag, etc., is ejected from the gap between the drill rod and the borehole protector. The gas is pumped away by the gas extraction system, and the water and coal slag are collected by the water and slag collection system. However, the high pressure at the gas nozzles causes some gas to leak into the mine through the sealing and dynamic sealing structures. Currently, gas nozzles are generally detected manually based on experience or with the help of some instruments, and then corresponding protective measures are taken manually. This process is somewhat delayed and can easily lead to partial gas leakage, which seriously threatens the safety of construction workers.

[0004] Therefore, there is an urgent need for a borehole protection device with good protective effect and real-time performance. Summary of the Invention

[0005] To overcome the technical defects of existing protective devices for coal mine drilling construction, such as poor protective effect and certain lag, this invention provides an intelligent safety protection device for coal mine drilling construction.

[0006] The intelligent safety protection device for coal mine drilling construction provided by this invention includes:

[0007] A borehole sealing mechanism includes a borehole protector inserted into the borehole. The borehole protector achieves a first seal with the borehole through a sealing airbag fitted on its outer side. One end of the borehole protector extends out of the borehole and is connected to a sealing cover. The sealing cover abuts against the coal seam wall through an inflatable sealing ring located at its edge to achieve a second seal between the borehole protector and the borehole. A one-way valve is provided on the section of the borehole protector between the sealing airbag and the sealing cover. The one-way valve only allows gas to flow into the borehole protector in one direction.

[0008] The pressure-sensing diversion mechanism includes a bracket on which a multi-port pipe is coaxially arranged with the borehole tube. One end of the multi-port pipe is connected to a sealing cover, and the other end of the multi-port pipe is provided with an end plate and a through hole for penetrating the drill rod. The top side wall of the multi-port pipe is provided with an extraction hole, and the bottom of the multi-port pipe is provided with a slag discharge hole. A pressure sensor is provided inside the multi-port pipe, and two sealing blocks are also provided inside the multi-port pipe. The sealing blocks abut against the end plate and are driven to move closer or further apart from each other. When the two sealing blocks come close together, they clamp the drill rod to achieve a seal between the drill rod and the through hole.

[0009] A gas-slag separation mechanism includes a housing. The upper part of the housing, near the pressure-sensing diversion mechanism, is connected to the extraction port via a first corrugated pipe. The lower part of the housing, near the pressure-sensing diversion mechanism, is connected to the slag discharge port via a second corrugated pipe. A concentration sensor and a flow sensor are provided on the top of the housing. The upper part of the housing, away from the pressure-sensing diversion mechanism, is connected to a gas extraction system via a third corrugated pipe. The lower part of the housing, away from the pressure-sensing diversion mechanism, is connected to a water-slag collection system via a fourth corrugated pipe.

[0010] The control mechanism includes a pneumatic control box and an electrical control box. The pneumatic control box supplies air to each pneumatic component. The electrical control box activates the blowout prevention mode when it receives warning signals from the pressure sensor, concentration sensor, and flow sensor simultaneously. In the blowout prevention mode, the electrical control box controls the pressure increase of the sealing airbag and the inflatable sealing ring, controls the drill rod to stop drilling, and controls the two sealing blocks to move closer to each other.

[0011] Optionally, the sealing cover is a bowl-shaped structure, the inflatable sealing ring is located on the edge of the bowl-shaped structure, the center of the bottom of the bowl-shaped structure is provided with a connection hole adapted to the protective tube, the end edge of the protective tube is sealed to the edge of the connection hole, and the end of the multi-port pipe is sealed to the bottom of the bowl-shaped structure through a flange.

[0012] Optionally, the multi-port pipe is equipped with a gripper cylinder inside, and two sealing blocks are respectively installed on the two grippers of the gripper cylinder to achieve mutual approach or distance.

[0013] Optionally, the multi-port pipe is a structure formed by splicing two pipe sections, and the sealing block can be detachably fixed on the gripper of the gripper cylinder.

[0014] Optionally, a baffle is provided on the inner top of the housing, with the concentration sensor and flow sensor located on opposite sides of the baffle, and the concentration sensor located on the side closer to the pressure-sensing diversion mechanism.

[0015] Optionally, a flow channel is provided on the inner side of the top of the housing. The flow channel is located on the side of the baffle plate away from the pressure-sensing diversion mechanism. The flow sensor is located at the inlet end of the flow channel, and the third corrugated pipe is connected to the outlet end of the flow channel.

[0016] Optionally, a first pneumatic solenoid valve is provided at the connection between the housing and the fourth bellows, and in the blowout prevention mode, the electrical control box controls the first pneumatic solenoid valve to open intermittently at regular intervals.

[0017] Optionally, a guide plate is provided on the inner bottom side of the housing, and the middle part of the guide plate is recessed downward to form an outlet. The outlet is provided with a second pneumatic solenoid valve, and the electrical control box controls the second pneumatic solenoid valve to open and close in the opposite way to the first pneumatic solenoid valve.

[0018] Optionally, the top of the housing is equipped with an audible and visual warning device and an audible and visual alarm. The audible and visual warning device is activated when one or both of the pressure sensor, concentration sensor and flow sensor issue a warning signal, and the audible and visual alarm is activated when the anti-spray mode is triggered.

[0019] Optional, intelligent safety protection devices for coal mine drilling operations also include:

[0020] The blowout preventer has one end connected to the upper part of the housing away from the pressure-sensing diversion mechanism via a fifth corrugated pipe. A third pneumatic solenoid valve is provided at the connection between the fifth corrugated pipe and the blowout preventer. In the blowout prevention mode, the electrical control box controls the third pneumatic solenoid valve to open. The other end of the blowout preventer is connected to the gas extraction system via a sixth corrugated pipe.

[0021] The technical solution provided by this invention has the following advantages compared with the prior art:

[0022] 1) The intelligent safety protection device for coal mine drilling provided by this invention has two aspects. First, a sealing cover is added to the end of the borehole casing. Together with the sealing airbag, it can achieve a double seal between the borehole casing and the borehole. Furthermore, a one-way valve allows the gas that has passed through the sealing airbag to flow back into the borehole casing. Second, two sealing blocks are added to the inside of the multi-port pipe. When the blowout prevention mode is triggered, the two sealing blocks move closer to each other to achieve a seal between the drill rod and the through hole. Together with the original dynamic sealing structure of the drill rod, it can achieve a double seal between the drill rod and the borehole casing. The combination of these two aspects can improve the sealing performance between the borehole casing and the borehole, as well as between the borehole casing and the drill rod, thereby improving the protection performance of the device. In addition, in the blowout prevention mode, the electrical control box can control the pressure increase of the sealing airbag and the inflatable sealing ring, further improving the protection performance of the device.

[0023] 2) The intelligent safety protection device for coal mine drilling provided by this invention is equipped with a pressure sensor, a concentration sensor and a flow sensor. When the control box receives warning signals from the pressure sensor, concentration sensor and flow sensor at the same time, it activates the anti-blowout mode to automatically perform the corresponding protection operation without human intervention and with good real-time performance. Furthermore, the control box only activates the anti-blowout mode when it receives warning signals from the pressure sensor, concentration sensor and flow sensor at the same time. Through the coordinated operation of pressure, concentration and flow, the accuracy of the machine in determining the anti-blowout can be improved, ensuring the practicality of the device. Attached Figure Description

[0024] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with the invention and, together with the description, serve to explain the principles of the invention.

[0025] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, for those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0026] Figure 1 This is a schematic diagram of the intelligent safety protection device for coal mine drilling operations in an embodiment of the present invention.

[0027] Figure 2 This is a cross-sectional view of the orifice sealing mechanism in an embodiment of the present invention;

[0028] Figure 3 This is a cross-sectional view of the pressure-sensing shunt mechanism in an embodiment of the present invention;

[0029] Figure 4 This is an assembly diagram showing the sealing block and the gripper cylinder in an embodiment of the present invention;

[0030] Figure 5 This is a cross-sectional view of the gas-slag separation mechanism in an embodiment of the present invention.

[0031] In the picture:

[0032] 100. Orifice sealing mechanism; 110. Protective tube; 120. Sealing airbag; 130. Sealing cover; 140. Inflatable sealing ring; 150. One-way valve; 200. Pressure-sensing diversion mechanism; 210. Support; 220. Multi-port pipe; 221. Extraction hole; 222. Slag discharge hole; 223. Flange; 230. End plate; 240. Pressure sensor; 250. Sealing block; 260. Grip cylinder; 300. Gas-slag separation mechanism; 310. Housing; 311. Baffle plate; 312. Flow channel; 313. 314. Deflector plate; 320. Second pneumatic solenoid valve; 330. First bellows; 340. Second bellows; 350. Concentration sensor; 360. Flow sensor; 370. Third bellows; 371. Fourth bellows; 380. First pneumatic solenoid valve; 390. Audible and visual alarm; 400. Control mechanism; 410. Pneumatic control box; 420. Electrical control box; 500. Blowout buffer; 510. Fifth bellows; 520. Third pneumatic solenoid valve; 530. Sixth bellows. Detailed Implementation

[0033] To better understand the above-mentioned objectives, features, and advantages of the present invention, the solutions of the present invention will be further described below. It should be noted that, unless otherwise specified, the embodiments of the present invention and the features thereof can be combined with each other.

[0034] In this description, it should be noted that the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance. It should also be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joint" should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms according to the specific circumstances.

[0035] Many specific details are set forth in the following description in order to provide a full understanding of the invention, but the invention may also be practiced in other ways different from those described herein; obviously, the embodiments in the specification are only some embodiments of the invention, and not all embodiments.

[0036] The following is combined with Figures 1 to 5 Specific embodiments of the present invention will be described in detail below.

[0037] This embodiment provides an intelligent safety protection device for coal mine drilling construction, including a borehole sealing mechanism 100, a pressure-sensing diversion mechanism 200, a gas-slag separation mechanism 300, and a control mechanism 400.

[0038] The orifice sealing mechanism 100 includes a borehole protector tube 110 inserted into the borehole. The borehole protector tube 110 achieves a first seal with the borehole through a sealing airbag 120 sleeved on its outer side. One end of the borehole protector tube 110 extends out of the borehole and is connected to a sealing cover 130. The sealing cover 130 abuts against the coal seam wall through an inflatable sealing ring 140 located on its edge to achieve a second seal between the borehole protector tube 110 and the borehole. The section of the borehole protector tube 110 located between the sealing airbag 120 and the sealing cover 130 is equipped with a one-way valve 150. The one-way valve 150 only allows gas to flow into the borehole protector tube 110 in one direction.

[0039] It should be noted that when a gas eruption occurs, high-pressure gas leakage mainly occurs through two pathways: first, leakage through the gap between the protective tube 110 and the borehole; second, leakage through the gap between the drill pipe and the protective tube 110. This device achieves double sealing for the first path through the sealing airbag 120 and the sealing cover 130. Even if high-pressure gas breaches the sealing airbag 120 during a gas eruption, the sealing cover 130 still protects the gap between the protective tube 110 and the borehole. Furthermore, the one-way valve 150 provides a return channel for gas that has passed through the sealing airbag 120, allowing it to flow back into the protective tube 110 for extraction. This device also achieves double sealing for the second path through the structural design of the pressure-sensing diversion mechanism 200, which will be described in detail later.

[0040] Specifically, the sealing cover 130 has a bowl-shaped structure, and the inflatable sealing ring 140 is located at the edge of the bowl-shaped structure. A connecting hole adapted to the borehole protector 110 is opened at the center of the bottom of the bowl-shaped structure. The end edge of the borehole protector 110 is sealed to the edge of the connecting hole. During installation, the position of the sealing cover 130 is determined by the borehole protector 110. After installation, gas is injected into the inflatable sealing ring 140 to expand it, thereby achieving a seal between the sealing cover 130 and the coal seam wall. Since the sealing cover 130 is sealed to the borehole protector 110 on one hand and covers the outside of the borehole on the other hand, it can achieve a seal between the borehole protector 110 and the borehole.

[0041] More specifically, the protective tube 110 and the sealing cover 130 can be designed separately and then connected by welding or other means; or they can be designed as a single piece.

[0042] It should be noted that the sealing airbag 120 mainly serves as a sealing structure in the prior art. The reason for using the sealing airbag 120 to complete the sealing is mainly to cooperate with the control mechanism 400 to automatically increase the air pressure during gas injection to enhance protection.

[0043] Furthermore, the one-way valve 150 can be equipped with a pneumatic ball valve during actual installation. The pneumatic ball valve is normally closed, and the control mechanism 400 will only control the pneumatic ball valve to open when the blowout prevention mode is triggered. This setting can prevent outside air from entering the protective pipe 110 through the one-way valve 150 and affecting the gas concentration when the blowout prevention mode is not triggered due to the poor sealing between the sealing cover 130 and the coal seam wall.

[0044] The pressure-sensing diversion mechanism 200 includes a bracket 210, on which a multi-port pipe 220 is coaxially arranged with the borehole tube 110. One end of the multi-port pipe 220 is connected to the sealing cover 130, and the other end of the multi-port pipe 220 is provided with an end plate 230 and a through hole for penetrating the drill rod. The top side wall of the multi-port pipe 220 is provided with an extraction hole 221, and the bottom of the multi-port pipe 220 is provided with a slag discharge hole 222. A pressure sensor 240 is provided inside the multi-port pipe 220. Two sealing blocks 250 are also provided inside the multi-port pipe 220. The sealing blocks 250 abut against the end plate 230 and can be driven to move closer or further away from each other. When the two sealing blocks 250 are close together, they clamp the drill rod to achieve a seal between the drill rod and the through hole.

[0045] Specifically, the bracket 210 is designed as a liftable structure to facilitate installation and support and fixation of the multi-port pipe 220.

[0046] Specifically, the end of the multi-port pipe 220 is sealed to the bottom of the bowl-shaped structure via flange 223, which is easy to install and disassemble, and can achieve good sealing performance when used with a sealing gasket.

[0047] It should be noted that this device, through the use of the sealing block 250 in conjunction with the existing dynamic sealing structure, can achieve double sealing of the second path mentioned above. When the gas erupts, the control mechanism 400 controls the two sealing blocks 250 to move closer to each other. The sealing block 250 abuts against the end plate 230 on one hand and clamps the drill rod on the other. The two aspects work together to achieve a seal between the drill rod and the through hole. High-pressure gas must pass through the sealing block 250 to reach the dynamic sealing structure, thus improving the protective performance.

[0048] Specifically, the multi-port pipe 220 is equipped with a gripper cylinder 260, and two sealing blocks 250 are respectively mounted on the two grippers of the gripper cylinder 260 to move closer or further apart. Using the gripper cylinder 260 as the driving component for the sealing blocks 250 has two advantages: first, the gripper cylinder 260 uses compressed gas as its power source, making it more suitable for downhole operating environments and providing a higher safety factor; second, the gripper cylinder 260 is more conducive to ensuring the synchronous movement of the two sealing blocks 250, thereby ensuring the sealing effect of the sealing blocks 250.

[0049] It is easy to understand that, since the surface of the drill pipe is not flat, the sealing block 250 should be made of flexible materials such as rubber so that the drill pipe can be sealed by its own deformation when the two sealing blocks 250 come close to each other.

[0050] More specifically, the multi-port pipe 220 is a structure formed by splicing two pipe sections, and the sealing block 250 can be detachably fixed on the jaws of the clamping cylinder 260, which makes it easier to maintain and replace the sealing block 250.

[0051] The gas-slag separation mechanism 300 includes a housing 310. The upper part of the housing 310, which is close to the pressure-sensing diversion mechanism 200, is connected to the extraction hole 221 through a first corrugated pipe 320. The lower part of the housing 310, which is close to the pressure-sensing diversion mechanism 200, is connected to the slag discharge hole 222 through a second corrugated pipe 330. The top of the housing 310 is equipped with a concentration sensor 340 and a flow sensor 350. The upper part of the housing 310, which is away from the pressure-sensing diversion mechanism 200, is connected to the gas extraction system through a third corrugated pipe 360. The lower part of the housing 310, which is away from the pressure-sensing diversion mechanism 200, is connected to the water-slag collection system through a fourth corrugated pipe 370.

[0052] It should be noted that relying solely on pressure sensor 240, concentration sensor 340, or flow sensor 350 to determine whether a gas eruption has occurred carries a significant risk of false alarms. For example, due to the internal conditions of the coal seam, a high-pressure gas flow may be generated. This gas flow might cause pressure sensor 240 to reach its warning value, but because the amount is very small, it is unnecessary to activate the blowout prevention mode for emergency handling. This device utilizes the combined action of pressure sensor 240, concentration sensor 340, and flow sensor 350. The blowout prevention mode is only activated when all three sensors send warning signals to the control mechanism 400, thus reducing the machine's false alarm rate.

[0053] It is easy to understand that both gas extraction systems and slag collection systems are mature structures in this field, and will not be elaborated here.

[0054] Furthermore, a baffle plate 311 is provided on the inner top of the housing 310. The concentration sensor 340 and the flow sensor 350 are located on opposite sides of the baffle plate 311, with the concentration sensor 340 positioned closer to the pressure-sensing diversion mechanism 200. Since the flow sensor 350 provides more accurate detection results in a stable airflow environment, this device provides a baffle plate 311 on the inlet side of the flow sensor 350. This ensures that when the gas-slag mixture is injected into the housing 310, the gas must bypass the baffle plate 311 before entering the flow sensor 350. This makes the gas entering the flow sensor 350 more stable and improves detection accuracy.

[0055] Furthermore, a flow channel 312 is provided on the inner top side of the housing 310. The flow channel 312 is located on the side of the baffle 311 away from the pressure-sensing diversion mechanism 200. The flow sensor 350 is located at the inlet end of the flow channel 312, and the third bellows 360 is connected to the outlet end of the flow channel 312. The flow channel 312 enables greater stability of the gas flow, thereby improving the detection accuracy of the flow sensor 350.

[0056] Furthermore, a first pneumatic solenoid valve 371 is installed at the connection between the housing 310 and the fourth corrugated pipe 370. In the blowout prevention mode, the electrical control box 420 controls the first pneumatic solenoid valve 371 to open intermittently at regular intervals. Since outside air can easily flow back into the housing 310 along the fourth corrugated pipe 370 when the first pneumatic solenoid valve 371 is open, by designing the first pneumatic solenoid valve 371 and controlling its intermittent opening at regular intervals, the amount of outside gas entering the housing 310 can be significantly reduced while ensuring smooth slag discharge, thereby improving the gas extraction concentration and ensuring gas utilization rate.

[0057] Furthermore, a guide plate 313 is provided on the inner bottom side of the housing 310. The middle part of the guide plate 313 is recessed downward to form an outlet. A second pneumatic solenoid valve 314 is provided at the outlet, and the electrical control box 420 controls the second pneumatic solenoid valve 314 to open and close in the opposite way to the first pneumatic solenoid valve 371. Even if the first pneumatic solenoid valve 371 is controlled to open intermittently at regular intervals, some air will still enter the housing 310 at the moment the first pneumatic solenoid valve 371 opens. Therefore, this device also provides a second pneumatic solenoid valve 314. When the first pneumatic solenoid valve 371 is open, the second pneumatic solenoid valve 314 is controlled to close to isolate the outside air from the extraction area above the housing 310. When the first pneumatic solenoid valve 371 is open, the second pneumatic solenoid valve 314 is controlled to open so that the accumulated water and coal slag fall into the bottom of the housing 310 through the outlet. This setting can further reduce the amount of outside gas entering the housing 310.

[0058] Furthermore, the top of the housing 310 is equipped with an audible and visual warning device 380 and an audible and visual alarm 390. The audible and visual warning device 380 activates when one or both of the pressure sensor 240, concentration sensor 340, and flow sensor 350 issue a warning signal, and the audible and visual alarm 390 activates when the anti-spray mode is triggered. The audible and visual warning device 380 and the audible and visual alarm 390 can alert operators to abnormal gas conditions through both visual and auditory means, allowing for timely action.

[0059] The control mechanism 400 includes a pneumatic control box 410 and an electrical control box 420. The pneumatic control box 410 is used to supply air to each pneumatic component. The electrical control box 420 is used to activate the blowout prevention mode when it receives warning signals from the pressure sensor 240, the concentration sensor 340, and the flow sensor 350 at the same time. In the blowout prevention mode, the electrical control box 420 controls the pressure of the sealing airbag 120 and the inflatable sealing ring 140 to increase, controls the drill rod to stop drilling, and controls the two sealing blocks 250 to move closer to each other.

[0060] It is easy to understand that in the protective device of this embodiment, the pneumatic components include a sealing airbag 120, an inflatable sealing ring 140, a gripper cylinder 260, and multiple pneumatic solenoid valves.

[0061] It should be noted that the program on which the electrical control box 420 controls the sealing airbag 120, the inflatable sealing ring 140, and other devices is easily designed by those skilled in the art, and will not be described in detail here.

[0062] Specifically, both the pneumatic control box 410 and the electrical control box 420 are fixed to the side wall of the housing 310.

[0063] In addition, the protective device in this embodiment also includes a blowout preventer 500. One end of the blowout preventer 500 is connected to the upper part of the housing 310 away from the pressure-sensing diversion mechanism 200 via a fifth corrugated pipe 510. A third pneumatic solenoid valve 520 is provided at the connection between the fifth corrugated pipe 510 and the blowout preventer 500. In blowout prevention mode, the electrical control box 420 controls the third pneumatic solenoid valve 520 to open. The other end of the blowout preventer 500 is connected to the gas extraction system via a sixth corrugated pipe 530. When a gas erupts, the gas extraction pipeline alone may not be able to meet the instantaneous flow and pressure requirements of the eruption. Therefore, this embodiment adds a blowout preventer 500 to provide a larger buffer space for the gas at the instant of the gas eruption, avoiding excessive impact of the gas eruption on the gas extraction system.

[0064] Specifically, the blowout buffer 500 can be constructed using structures such as airbags and bellows.

[0065] The working principle of the intelligent safety protection device for coal mine drilling construction in this embodiment is as follows:

[0066] During normal drilling, the drill rod passes through the multi-port pipe 220 and the borehole protection pipe 110 in sequence and then extends into the coal seam for drilling. Because the sealing airbag 120 and the sealing cover 130 seal the gap between the borehole protection pipe 110 and the borehole, and the dynamic sealing structure between the drill rod and the end plate 230 seals the gap between the borehole protection pipe 110 and the borehole, the gas generated during drilling can only pass through the gap between the drill rod and the borehole protection pipe 110, the multi-port pipe 220, and the first corrugated pipe 320 in sequence before entering the box 310, and then enters the gas extraction system under negative pressure.

[0067] When a gas leak occurs, the pressure sensor 240, concentration sensor 340, and flow sensor 350 all reach their warning values ​​and send warning signals to the electrical control box 420. The electrical control box 420 activates the blowout prevention mode, which performs the following operations: increases the pressure of the sealing airbag 120 and the inflatable sealing ring 140 to improve protection; brings the two sealing blocks 250 closer together to double-seal the gap between the drill pipe and the borehole casing 110; controls the first pneumatic solenoid valve 371 and the second pneumatic solenoid valve 314 to open intermittently at regular intervals, and controls the opening and closing states of the first pneumatic solenoid valve 371 and the second pneumatic solenoid valve 314 to be opposite; controls the third pneumatic solenoid valve 520 to open; and controls the pneumatic operation of the audible and visual alarm 390.

[0068] It should be noted that, since this device is installed in a mine roadway, the relevant components need to be explosion-proof and / or flame-retardant, which is easy for those skilled in the art to design.

[0069] In addition, to facilitate operators to intuitively obtain real-time status information of drilling operations, this embodiment is also equipped with a display screen, which is connected to the electrical control box. The display screen displays the detection values ​​of pressure sensor 240, concentration sensor 340 and flow sensor 350 in real time in the form of waveform curves.

[0070] The above are merely specific embodiments of the present invention, enabling those skilled in the art to understand or implement the present invention. Although detailed descriptions have been provided with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments, and they should all be covered within the protection scope of the claims.

Claims

1. An intelligent safety protection device for coal mine drilling operations, characterized in that, include: The orifice sealing mechanism (100) includes a borehole protector (110) inserted into the borehole. The borehole protector (110) achieves a first seal with the borehole through a sealing airbag (120) fitted on its outer side. One end of the borehole protector (110) extends out of the borehole and is connected to a sealing cover (130). The sealing cover (130) abuts against the coal seam wall through an inflatable sealing ring (140) located on its edge to achieve a second seal between the borehole protector (110) and the borehole. A one-way valve (150) is provided on the section of the borehole protector (110) between the sealing airbag (120) and the sealing cover (130). The one-way valve (150) only allows gas to flow into the borehole protector (110) in one direction. The pressure-sensing diversion mechanism (200) includes a bracket (210) on which a multi-port pipe (220) is coaxially arranged with the borehole tube (110). One end of the multi-port pipe (220) is connected to the sealing cover (130). The other end of the multi-port pipe (220) is provided with an end plate (230) and a through hole for penetrating the drill rod is provided in the center. The top side wall of the multi-port pipe (220) is provided with a extraction hole (221). The bottom of the multi-port pipe (220) is provided with a slag discharge hole (222). The multi-port pipe (220) is provided with a pressure sensor (240) inside. The multi-port pipe (220) is also provided with two sealing blocks (250) inside. The sealing blocks (250) abut against the end plate (230) and are driven to move closer or further away from each other. When the two sealing blocks (250) move closer, they clamp the drill rod to achieve a seal between the drill rod and the through hole. A gas-slag separation mechanism (300) includes a housing (310). The upper part of the housing (310) near the pressure-sensing diversion mechanism (200) is connected to the extraction hole (221) through a first corrugated pipe (320). The lower part of the housing (310) near the pressure-sensing diversion mechanism (200) is connected to the slag discharge hole (222) through a second corrugated pipe (330). A concentration sensor (340) and a flow sensor (350) are provided on the top of the housing (310). The upper part of the housing (310) away from the pressure-sensing diversion mechanism (200) is connected to the gas extraction system through a third corrugated pipe (360). The lower part of the housing (310) away from the pressure-sensing diversion mechanism (200) is connected to the water-slag collection system through a fourth corrugated pipe (370). The control mechanism (400) includes a pneumatic control box (410) and an electrical control box (420). The pneumatic control box (410) is used to supply air to each pneumatic component. The electrical control box (420) is used to activate the blowout prevention mode when it receives warning signals from the pressure sensor (240), the concentration sensor (340), and the flow sensor (350) at the same time. In the blowout prevention mode, the electrical control box (420) controls the pressure increase of the plugging airbag (120) and the inflatable sealing ring (140), controls the drill rod to stop drilling, and controls the two plugging blocks (250) to move closer to each other.

2. The intelligent safety protection device for coal mine drilling construction according to claim 1, characterized in that, The sealing cover (130) is a bowl-shaped structure. The inflatable sealing ring (140) is located on the edge of the bowl-shaped structure. A connection hole adapted to the protective tube (110) is opened at the center of the bottom of the bowl-shaped structure. The end edge of the protective tube (110) is sealed to the edge of the connection hole. The end of the multi-port pipe (220) is sealed to the bottom of the bowl-shaped structure through a flange (223).

3. The intelligent safety protection device for coal mine drilling construction according to claim 1, characterized in that, The multi-port pipe (220) is equipped with a gripper cylinder (260) inside, and two sealing blocks (250) are respectively installed on the two grippers of the gripper cylinder (260) to achieve mutual approach or distance.

4. The intelligent safety protection device for coal mine drilling construction according to claim 3, characterized in that, The multi-port pipe (220) is a structure formed by splicing two pipe sections, and the sealing block (250) can be detachably fixed on the jaws of the jaw cylinder (260).

5. The intelligent safety protection device for coal mine drilling construction according to claim 1, characterized in that, A baffle plate (311) is provided on the inner top of the housing (310). The concentration sensor (340) and the flow sensor (350) are located on both sides of the baffle plate (311), and the concentration sensor (340) is located on the side close to the pressure-sensing diversion mechanism (200).

6. The intelligent safety protection device for coal mine drilling construction according to claim 5, characterized in that, The top inner side of the housing (310) is provided with a flow channel (312), the flow channel (312) is located on the side of the baffle (311) away from the pressure-sensing diversion mechanism (200), the flow sensor (350) is located at the inlet end of the flow channel (312), and the third corrugated pipe (360) is connected to the outlet end of the flow channel (312).

7. The intelligent safety protection device for coal mine drilling construction according to claim 1, characterized in that, A first pneumatic solenoid valve (371) is provided at the connection between the housing (310) and the fourth bellows (370), and in the anti-spray mode, the electrical control box (420) controls the first pneumatic solenoid valve (371) to open periodically and intermittently.

8. The intelligent safety protection device for coal mine drilling construction according to claim 7, characterized in that, The bottom inner side of the housing (310) is provided with a guide plate (313), the middle part of the guide plate (313) is recessed downward to form an outlet, the outlet is provided with a second pneumatic solenoid valve (314), and the electrical control box (420) controls the second pneumatic solenoid valve (314) to open and close in the opposite way to the first pneumatic solenoid valve (371).

9. The intelligent safety protection device for coal mine drilling construction according to claim 1, characterized in that, The top of the housing (310) is equipped with an audible and visual warning device (380) and an audible and visual alarm device (390). The audible and visual warning device (380) is activated when one or both of the pressure sensor (240), concentration sensor (340) and flow sensor (350) issue a warning signal, and the audible and visual alarm device (390) is activated when the anti-spray mode is triggered.

10. The intelligent safety protection device for coal mine drilling construction according to any one of claims 1 to 9, characterized in that, Also includes: The blowout preventer (500) has one end connected to the upper part of the housing (310) away from the pressure-sensing diversion mechanism (200) via a fifth bellows (510). A third pneumatic solenoid valve (520) is provided at the connection between the fifth bellows (510) and the blowout preventer (500). In the blowout prevention mode, the electrical control box (420) controls the third pneumatic solenoid valve (520) to open. The other end of the blowout preventer (500) is connected to the gas extraction system via a sixth bellows (530).

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