A method for classifying the strength grade of a coal seam drilling and jetting hole

Abstract

The present application relates to a kind of coal seam borehole jet hole strength grade classification method, including setting strength determination method, setting jet hole strength determination function and three steps such as jet hole strength determination determination function.The present application provides a kind of standard clear, low difficulty of implementation grade classification method, realizes the better division of borehole jet hole strength grade, and then reaches the use effect of further improving the safety of drilling;While effectively improving the working efficiency and precision of borehole jet hole strength detection, and the degree of automation and intelligentization of jet hole strength detection operation, the need of remote monitoring operation is realized, thereby effectively simplifying the difficulty of jet hole strength detection operation, and greatly improve the safety and reliability of borehole jet hole strength detection operation.

Description

Technical Field

[0001] This invention relates to a method for classifying the intensity level of coal seam borehole blowouts, belonging to the field of dynamic disaster prevention in borehole construction. Background Technology

[0002] Gas drainage is a crucial measure for ensuring safe coal mining. Before underground gas drainage, drainage boreholes must be constructed. During drilling, blowouts often occur, sometimes exceeding 2 meters in height under pressure, accompanied by explosive noises, severely threatening operational safety. Currently, there is a lack of effective methods for detecting borehole blowout intensity, as well as a lack of effective classification and understanding of blowout intensity and hazards. This results in a lack of accurate and scientific reference for borehole blowout management and control. Furthermore, current blowout intensity assessments often require close-range measurement at the time of occurrence, increasing safety risks and seriously threatening personnel safety within the drilling area. Preventing borehole blowout accidents during gas control remains a pressing technical challenge. This invention patent is crucial for ensuring safety in the gas control process.

[0003] Therefore, there is an urgent need to develop a method for classifying the strength grades of coal seam boreholes and perforations to meet the needs of practical applications. Summary of the Invention

[0004] To address the shortcomings of existing technologies, this invention provides a method for classifying the intensity level of coal seam boreholes. This invention offers a standardized and easy-to-implement classification method, enabling better classification of borehole intensity levels and thus further improving borehole safety. Simultaneously, it effectively improves the efficiency and accuracy of borehole intensity testing, and the automation and intelligence of the testing operation enable remote monitoring, thereby simplifying the difficulty of borehole intensity testing and significantly enhancing its safety and reliability.

[0005] To achieve the above objectives, the invention is implemented through the following technical solution:

[0006] A method for classifying the intensity grade of coal seam boreholes and blowouts includes the following steps:

[0007] S1, set the strength judgment method, and use the coal output and gas emission of the borehole as indicators to classify the strength of the blowhole. When classifying the strength of the blowhole using the coal output and gas emission of the borehole as indicators, the coal output and gas emission are classified according to the fracture zone and plastic zone formed around the borehole after drilling.

[0008] S2, Set the nozzle intensity determination function. After completing step S1, set the following in sequence:

[0009] The coal output per unit length Q in the coal-bearing section of the weak jet zone is defined as:

[0010]

[0011] The gas emission rate W in the weak nozzle zone is defined as:

[0012] W1≤W≤W2

[0013] The coal output per unit length Q in the coal-bearing section of the central jet hole area is defined as:

[0014]

[0015] The gas emission rate W in the central jet zone is defined as:

[0016] W2≤W≤W3

[0017] The coal output per unit length Q in the coal-bearing section of the high-pressure jetting zone is defined as:

[0018]

[0019] The gas emission rate W in the high-pressure nozzle area is defined as:

[0020] W≥W3

[0021] In the formula, ρ is the coal density, r0 is the theoretical borehole radius, and r p r is the theoretical radius of the fracture zone. s W1, W2, and W3 represent the gas emission rates calculated from the gas loss in the coal output under the theoretical borehole radius condition, the gas loss in the coal output in the theoretical crushed zone, and the gas loss in the coal output in the theoretical plastic zone, respectively. The radii of the theoretical crushed zone and the theoretical plastic zone can both be obtained according to the Mohr-Coulomb criterion.

[0022] S3, Borehole Intensity Determination: Parameters during actual drilling operations are continuously collected and compared with the intensity determination function in step S2. In the comparison: if either the coal output or gas emission reaches the specified range, it is determined to be the borehole intensity level within that range. If the coal output and gas emission are in two different levels, the higher level shall prevail.

[0023] Furthermore, in step S3, during the continuous acquisition of parameters during actual drilling operations, data is acquired through an acquisition system, and the acquisition system and drilling equipment operate in coordination, establishing a data connection through a communication network on the one hand, and an electrical connection through a control circuit system on the other.

[0024] Furthermore, in step S3, the acquisition system includes a data acquisition terminal, a relay server, a data processing system, and a drive circuit. The acquisition terminal is at least one, and the data acquisition terminals are connected in parallel. Each data acquisition terminal establishes a data connection with the data processing system through a relay server. Simultaneously, the acquisition terminal, relay server, and data processing system are all electrically connected to the drive circuit. The relay server is at least two, and the relay servers are interconnected via a communication network. The relay servers also establish data connections with the data acquisition terminal and the data processing system through a communication gateway.

[0025] Furthermore, the data acquisition terminal includes a guide sleeve, a flow sensor, a pressure sensor, an tilt sensor, a guide plate, a return spring, and a terminal block. The guide sleeve is a rectangular cavity structure with through holes coaxially distributed on its upper and lower surfaces. The guide plate is embedded within the guide sleeve, and its lower surface is hinged to the bottom of the guide sleeve via an elastic hinge. The plate surface forms a 30°–60° angle with the axis of the guide sleeve. The sidewall of the guide plate is also connected to the inner surface of the guide sleeve via an elastic connecting strip. A tilt sensor is located on the lower surface of the guide plate, and the lower surface is also connected to the bottom of the guide sleeve via at least two return springs. The spring axis is parallel to the guide sleeve axis, and the upper end face of the return spring is hinged to the lower end face of the guide plate. The lower end face is connected to the guide sleeve through a pressure sensor. The return spring is also symmetrically distributed on both sides of the through hole axis. The guide plate is provided with guide holes coaxial with the through hole. At the same time, a discharge port is provided at the bottom position of the guide sleeve corresponding to the guide plate. The axis of the discharge port intersects with the axis of the guide sleeve, and the axis of the discharge port forms an angle of 0° to 135° with the upper end face of the guide plate. A flow sensor is provided at the discharge port. At least one terminal is embedded outside the guide sleeve and is connected to the flow sensor, pressure sensor, tilt sensor, relay server and drive circuit respectively.

[0026] Furthermore, an auxiliary positioning bracket is provided on the upper end face of the guide sleeve, and a sampling container is provided outside the guide sleeve. The positioning bracket includes a positioning disc, a supporting keel, a connecting anchor rod, an adjusting bolt, a connecting spring, and a connecting slide rail. The supporting keel is a columnar frame structure coaxially distributed with the guide sleeve, covering the guide sleeve and slidably connected via the connecting slide rail. The positioning disc is a circular structure located above the supporting keel and the guide sleeve, and coaxially distributed with the guide sleeve. The positioning disc also has guide holes coaxially distributed with the guide sleeve, simultaneously positioning... The lower end face of the positioning plate is connected to the upper end face of the guide sleeve by at least three connecting springs evenly distributed around the axis of the guide sleeve. The outer side of the positioning plate is connected to the upper end face of the bearing keel by at least three adjusting bolts evenly distributed around the axis of the guide sleeve. At the same time, the upper end face of the positioning plate is connected to at least two connecting anchor rods, and the connecting anchor rods are evenly distributed around the axis of the positioning plate and form an angle of 30° to 90° with the upper end face of the positioning plate. The outer side of the bearing keel is provided with at least one connecting slide rail, and the connecting slide rail is connected to the sampling tank. The sampling tank is also connected to the discharge port through a guide pipe.

[0027] Furthermore, the sampling tank includes a support tank body, a drain outlet, a liquid level sensor, a turbidity sensor, an upper end cover, and a lower end cover. The support tank body is a cylindrical hollow tubular structure, with its upper and lower end faces connected to the upper and lower end covers to form a closed cavity structure. The upper end cover has an inlet and an outlet, which are connected to a guide pipe through the inlet. The lower end cover has a drain outlet, and the inlet and outlet are symmetrically distributed on both sides of the axis of the support tank body. The inner side of the support tank body is provided with a liquid level sensor and at least one turbidity sensor, and the turbidity sensor is located below the outlet and coaxially distributed with the outlet. Both the liquid level sensor and the turbidity sensor are electrically connected to the wiring terminals.

[0028] Furthermore, at least one flow channel is evenly distributed on the upper surface of the guide plate, and a retaining ring is provided at the guide hole position corresponding to the flow channel. The retaining ring is embedded in the guide hole and distributed coaxially with the guide hole. The upper and lower surfaces of the guide hole extend at least 10 mm beyond the upper and lower surfaces of the guide plate.

[0029] Furthermore, the driving circuit is a circuit system based on either a programmable controller or an FPGA chip; the data processing system is a cloud computing-based network server.

[0030] This invention provides a standardized and easy-to-implement method for classifying borehole strength levels, enabling better classification of borehole blowout strength levels and thus further improving borehole safety. Simultaneously, it effectively improves the efficiency and accuracy of borehole blowout strength testing, and the automation and intelligence of the testing process enable remote monitoring, thereby simplifying the difficulty of borehole strength testing and greatly enhancing its safety and reliability. Attached Figure Description

[0031] The present invention will now be described in detail with reference to the accompanying drawings and specific embodiments;

[0032] Figure 1 This is a flowchart of the method of the present invention;

[0033] Figure 2 This is a schematic diagram of a partial structure of the testing equipment;

[0034] Figure 3 This is a schematic diagram of a partial structure of the detection rod;

[0035] Figure 4 This is a schematic diagram of an elastic telescopic column structure;

[0036] Figure 5 This is a top-down view of a partial structure of the pressure plate. Detailed Implementation

[0037] To facilitate the implementation of the technical means, creative features, objectives, and effects of this invention, the invention will be further described below in conjunction with specific embodiments.

[0038] like Figure 1 As shown, a method for classifying the intensity grade of coal seam boreholes includes the following steps:

[0039] S1, set the strength judgment method, and use the coal output and gas emission of the borehole as indicators to classify the strength of the blowhole. When classifying the strength of the blowhole using the coal output and gas emission of the borehole as indicators, the coal output and gas emission are classified according to the fracture zone and plastic zone formed around the borehole after drilling.

[0040] S2, Set the nozzle intensity determination function. After completing step S1, set the following in sequence:

[0041] The coal output per unit length Q in the coal-bearing section of the weak jet zone is defined as:

[0042]

[0043] The gas emission rate W in the weak nozzle zone is defined as:

[0044] W1≤W≤W2

[0045] The coal output per unit length Q in the coal-bearing section of the central jet hole area is defined as:

[0046]

[0047] The gas emission rate W in the central jet zone is defined as:

[0048] W2≤W≤W3

[0049] The coal output per unit length Q in the coal-bearing section of the high-pressure jetting zone is defined as:

[0050]

[0051] The gas emission rate W in the high-pressure nozzle area is defined as:

[0052] W≥W3

[0053] In the formula, ρ is the coal density, r0 is the theoretical borehole radius, and r p r is the theoretical radius of the fracture zone. s W1, W2, and W3 represent the gas emission rates calculated from the gas loss in the coal output under the theoretical borehole radius condition, the gas loss in the coal output in the theoretical crushed zone, and the gas loss in the coal output in the theoretical plastic zone, respectively; the radii of the crushed zone and the plastic zone can both be obtained according to the Mohr-Coulomb criterion.

[0054] S3, Borehole Intensity Determination: Parameters during actual drilling operations are continuously collected and compared with the intensity determination function in step S2. In the comparison: if either the coal output or gas emission reaches the specified range, it is determined to be the borehole intensity level within that range. If the coal output and gas emission are in two different levels, the higher level shall prevail.

[0055] In this embodiment, during step S3, the parameters of the actual drilling operation are continuously collected through the acquisition system. The acquisition system and the drilling equipment work together, and a data connection is established through the communication network on the one hand, and an electrical connection is established through the control circuit system on the other hand.

[0056] like Figure 2-5As shown in this embodiment, the acquisition system in step S3 includes a data acquisition terminal 1, a relay server 2, a data processing system 3, and a drive circuit 4. The data acquisition terminal 1 is at least one, and the data acquisition terminals 1 are connected in parallel. Each data acquisition terminal 1 establishes a data connection with the data processing system 3 through a relay server 2. Simultaneously, the data acquisition terminal 1, relay server 2, and data processing system 3 are all electrically connected to the drive circuit 4. The data acquisition terminal 1 is at least two, and the relay servers 2 are interconnected through a communication network. The relay servers 2 also establish data connections with the data acquisition terminal 1 and the data processing system 3 through a communication gateway.

[0057] By using data acquisition terminals and relay servers, remote drilling and blowhole strength measurement can be effectively achieved. At the same time, the data processing system can compare and output the test results through data processing capabilities.

[0058] As specifically noted, the data acquisition terminal 1 includes a guide sleeve 11, a flow sensor 12, a pressure sensor 13, an inclination sensor 14, a guide plate 15, a return spring 16, and a terminal block 17. The guide sleeve 11 is a cavity structure with a rectangular axial cross-section, and its upper and lower surfaces are provided with through holes 18 distributed coaxially with it. The guide plate 15 is embedded in the guide sleeve 11, and its lower side is hinged to the bottom of the guide sleeve 11 via an elastic hinge, with its surface forming an angle of 30°–60° with the axis of the guide sleeve 11. The sidewall of the guide plate 15 is also connected to the inner side of the guide sleeve 11 via an elastic connecting band 19. An inclination sensor 14 is provided on the lower end face of the guide plate 15, and the lower end face is also connected to the bottom of the guide sleeve 11 via at least two return springs 16. The axis of the return springs 16 is aligned with the axis of the guide sleeve 11. The guide sleeves 11 are arranged in parallel along their axes, and the upper end face of the return spring 16 is hinged to the lower end face of the guide plate 15. The lower end face of the return spring 16 is connected to the guide sleeve 11 through a pressure sensor 13. The return spring 16 is also symmetrically distributed on both sides of the through hole 18. The guide plate 15 is provided with guide holes 10 that are coaxially distributed with the through hole 18. At the same time, a discharge port 101 is provided at the bottom of the guide sleeve 11 corresponding to the guide plate 15. The axis of the discharge port 101 intersects with the axis of the guide sleeve 11, and the axis of the discharge port 101 forms an angle of 0° to 135° with the upper end face of the guide plate 15. A flow sensor 12 is provided at the discharge port 101. At least one terminal block 17 is embedded outside the guide sleeve 11 and is connected to the flow sensor 12, the pressure sensor 13, the tilt sensor 14, the relay server 2, and the drive circuit, respectively.

[0059] During the detection process, when a blowout occurs, the gas, liquid medium, and coal fragments ejected from the borehole all fall onto the guide plate. Under the impact force, the guide plate flips and moves downward through the elastic hinge. Thus, on the one hand, the tilt sensor detects the change in the angle of the guide plate, thereby indirectly obtaining the force intensity at the blowout. On the other hand, when the guide plate moves, the pressure sensor directly obtains the force data of the guide plate, further determining the force intensity of the guide plate, thereby obtaining the blowout intensity data.

[0060] The guide sleeve 11 has an auxiliary positioning bracket on its upper surface, and a sampling container 5 is provided outside the guide sleeve. The positioning bracket includes a positioning plate 111, a supporting keel 112, a connecting anchor rod 113, an adjusting bolt 114, a connecting spring 115, and a connecting slide rail 116. The supporting keel 112 is a columnar frame structure coaxially distributed with the guide sleeve 11. The supporting keel 112 covers the guide sleeve 11 and is slidably connected to it via the connecting slide rail 116. The positioning plate 111 is a disc structure, located above the supporting keel 112 and the guide sleeve 11, and coaxially distributed with the guide sleeve 11. The positioning plate 111 also has guide holes 117 coaxially distributed with the guide sleeve 11, which simultaneously position... The lower end face of the positioning disc 111 is connected to the upper end face of the guide sleeve 11 via at least three connecting springs 115 evenly distributed around the axis of the guide sleeve 11. The outer side of the positioning disc 111 is connected to the upper end face of the supporting keel 116 via at least three adjusting bolts 114 evenly distributed around the axis of the guide sleeve 11. At the same time, the upper end face of the positioning disc 111 is connected to at least two connecting anchor rods 113, and the connecting anchor rods 113 are evenly distributed around the axis of the positioning disc 111 and form an angle of 30° to 90° with the upper end face of the positioning disc 111. The outer side of the supporting keel 112 is provided with at least one connecting slide rail 116, and the connecting slide rail 116 is connected to the sampling tank 5. The sampling tank 5 is also connected to the discharge port 101 via a guide pipe.

[0061] By using the supporting keel and positioning plate, the positioning plate is connected to the geological structure at the borehole to be tested through the connecting anchor rod, which improves the positioning stability of the guide sleeve and prevents the guide sleeve from shifting due to excessive force from the nozzle. On the other hand, while adjusting the working position of the guide sleeve and the positioning plate by adjusting the bolts, the connecting spring is used to buffer and dampen the impact force on the guide sleeve, further improving the operational stability of the equipment.

[0062] Specifically, the sampling tank 5 includes a support tank 51, a drain outlet 52, a liquid level sensor 53, a turbidity sensor 54, an upper end cover 55, and a lower end cover 56. The support tank 51 is a cylindrical hollow tubular structure, with its upper and lower end faces connected to the upper end cover 55 and the lower end cover 56 to form a closed cavity structure. The upper end cover 55 is provided with an inlet 57 and an outlet 58, and is connected to a guide pipe through the inlet 57. The lower end cover 56 is provided with a drain outlet 52, and the inlet 57 and the outlet 58 are symmetrically distributed on both sides of the axis of the support tank 51. The inner side of the support tank 51 is provided with a liquid level sensor 53 and at least one turbidity sensor 54, and the turbidity sensor 54 is located below the outlet 58 and coaxially distributed with the outlet 57. The liquid level sensor 53 and the turbidity sensor 54 are both electrically connected to the terminal block 17.

[0063] The jet from the borehole is transported to the sampling tank after being inspected and guided by a baffle plate. The sampling tank then detects the turbidity of the input medium to obtain data on the solid content of the jet, thus indirectly achieving the purpose of jet strength detection.

[0064] In addition, at least one flow channel 151 is evenly distributed on the upper end surface of the flow guide plate 15, and a retaining ring 152 is provided at the position of the guide hole 10 corresponding to the flow channel 151. The retaining ring 152 is embedded in the guide hole 10 and is coaxially distributed with the guide hole 10. The upper end surface and the lower end surface of the guide hole 10 both extend at least 10 mm beyond the upper end surface and the lower end surface of the flow guide plate 15.

[0065] In this embodiment, the driving circuit 4 is a circuit system based on either a programmable controller or an FPGA chip; the data processing system is a cloud computing-based network server.

[0066] Based on the mechanism of blowout occurrence, the intensity of blowout is classified according to two indicators: the amount of coal produced and the amount of gas emitted during the drilling process.

[0067] The coal yield from a borehole can be calculated based on the fractured and plastic zones formed around the borehole after drilling. Ideally, the borehole diameter remains constant, but the coal body is relatively soft, and borehole diameter expansion may occur during drilling, especially in fractured coal zones, where the actual borehole diameter will be larger than the theoretical borehole diameter. In areas with weaker borehole strength, the maximum extent of the diameter expansion zone is defined by the fractured zone formed by the theoretical borehole diameter; in this zone, the coal yield is low. When the coal yield exceeds the theoretical yield in the fractured zone but is lower than the theoretical yield in the plastic zone, the coal yield is moderate; when the coal yield exceeds the theoretical yield in the plastic zone, the coal yield is high.

[0068] Regarding gas emission, theoretically, the maximum gas emission should be calculated based on the sum of lost gas and desorbed gas within the borehole depressurization range. According to field tests, the desorption of pulverized coal in perforated boreholes is relatively low. Furthermore, the borehole is filled with water and under pressure, resulting in slower pulverized coal desorption inside the borehole. Therefore, the gas emitted at the moment of coal ejection is primarily lost gas generated after depressurization. Consequently, the lower limit of the gas emission is calculated based on the lost gas volume of the coal output under the theoretical borehole radius conditions. The lower limits are defined by the lost gas volume of the total coal output in the crushed and plastic zones, respectively. Borehole gas emission is then classified into low, medium, and high levels. Lost gas volume can be obtained according to the national standard GB / T-23250.

[0069] This invention provides a standardized and easy-to-implement method for classifying borehole strength levels, enabling better classification of borehole blowout strength levels and thus further improving borehole safety. Simultaneously, it effectively improves the efficiency and accuracy of borehole blowout strength testing, and the automation and intelligence of the testing process enable remote monitoring, thereby simplifying the difficulty of borehole strength testing and greatly enhancing its safety and reliability.

[0070] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the present invention as claimed. The scope of protection of this invention is defined by the appended claims and their equivalents.

Claims

1. A method for classifying the strength grade of coal seam boreholes and blowouts, characterized in that: The method for classifying the intensity grade of coal seam boreholes and blowouts includes the following steps: S1, set the strength judgment method, and use the coal output and gas emission of the borehole as indicators to classify the strength of the blowhole. When classifying the strength of the blowhole using the coal output and gas emission of the borehole as indicators, the coal output and gas emission are classified according to the fracture zone and plastic zone formed around the borehole after drilling. S2, Set the nozzle intensity determination function. After completing step S1, set the following in sequence: The coal output per unit length Q in the coal-bearing section of the weak jet zone is defined as: ; The gas emission rate W in the weak nozzle zone is defined as: ; The coal output per unit length Q in the coal-bearing section of the central jet hole area is defined as: ; The gas emission rate W in the central jet zone is defined as: ; The coal output per unit length Q in the coal-bearing section of the high-pressure jetting zone is defined as: ; The gas emission rate W in the high-pressure nozzle area is defined as: ; In the formula, ρ is the coal density, r0 is the theoretical borehole radius, rp is the theoretical fracture zone radius, rs is the theoretical plastic zone radius, and W1, W2, and W3 represent the gas emission rates calculated from the gas loss in the coal output under the theoretical borehole radius condition, the gas loss in the coal output under the theoretical fracture zone condition, and the gas loss in the coal output under the theoretical plastic zone condition, respectively; the radii of the theoretical fracture zone and the theoretical plastic zone can both be obtained according to the Mohr-Coulomb criterion. S3, Borehole Intensity Determination: Parameters during actual drilling operations are continuously collected and compared with the intensity determination function in step S2. In the comparison: if either the coal output or gas emission reaches the specified range, it is determined to be the borehole intensity level within that range. If the coal output and gas emission are in two different levels, the higher level shall prevail.

2. The method for classifying the strength grade of coal seam boreholes and blowholes according to claim 1, characterized in that: In step S3, during the continuous acquisition of parameters during actual drilling operations, data is acquired through an acquisition system. The acquisition system and the drilling equipment work together, establishing a data connection through a communication network and an electrical connection through a control circuit system.

3. The method for classifying the strength grade of coal seam boreholes according to claim 2, characterized in that: In step S3, the acquisition system includes a data acquisition terminal, a relay server, a data processing system, and a drive circuit. The acquisition terminal is at least one, and all data acquisition terminals are connected in parallel. Each data acquisition terminal establishes a data connection with the data processing system through a relay server. Simultaneously, the acquisition terminal, relay server, and data processing system are all electrically connected to the drive circuit. The relay server is at least two, and all relay servers are interconnected via a communication network. The relay servers also establish data connections with the data acquisition terminal and the data processing system through a communication gateway.

4. The method for classifying the strength grade of coal seam boreholes according to claim 3, characterized in that: The data acquisition terminal includes a guide sleeve, a flow sensor, a pressure sensor, a tilt sensor, a guide plate, a return spring, and wiring terminals. The guide sleeve is a rectangular cavity structure with through holes coaxially distributed on its upper and lower surfaces. The guide plate is embedded in the guide sleeve, and its lower surface is hinged to the bottom of the guide sleeve via an elastic hinge. The plate surface forms a 30°–60° angle with the axis of the guide sleeve. The sidewall of the guide plate is also connected to the inner surface of the guide sleeve via an elastic connecting strip. A tilt sensor is located on the lower surface of the guide plate, and the lower surface is also connected to the bottom of the guide sleeve via at least two return springs. The lines are distributed parallel to the axis of the guide sleeve, and the upper end face of the return spring is hinged to the lower end face of the guide plate. The lower end face is connected to the guide sleeve through a pressure sensor. At the same time, the return springs are symmetrically distributed on both sides of the through hole axis. The guide plate is provided with guide holes distributed coaxially with the through hole. At the same time, a discharge port is provided at the bottom position of the guide sleeve corresponding to the guide plate. The axis of the discharge port intersects the axis of the guide sleeve, and the axis of the discharge port forms an angle of 0° to 135° with the upper end face of the guide plate. A flow sensor is provided at the discharge port. At least one terminal is embedded outside the guide sleeve and is connected to the flow sensor, pressure sensor, tilt sensor, relay server and drive circuit respectively.

5. The method for classifying the strength grade of coal seam boreholes according to claim 4, characterized in that: An auxiliary positioning bracket is provided on the upper end face of the guide sleeve, and a sampling container is provided outside the guide sleeve. The positioning bracket includes a positioning plate, a supporting keel, a connecting anchor rod, an adjusting bolt, a connecting spring, and a connecting slide rail. The supporting keel is a columnar frame structure coaxially distributed with the guide sleeve, covering the guide sleeve and slidably connected via the connecting slide rail. The positioning plate is a disc structure, located above the supporting keel and the guide sleeve, and coaxially distributed with the guide sleeve. The positioning plate also has guide holes coaxially distributed with the guide sleeve. The positioning plate is located below... The end face is connected to the upper end face of the guide sleeve by at least three connecting springs evenly distributed around the axis of the guide sleeve. The outer side of the positioning plate is connected to the upper end face of the bearing keel by at least three adjusting bolts evenly distributed around the axis of the guide sleeve. At the same time, the upper end face of the positioning plate is connected to at least two connecting anchor rods, and the connecting anchor rods are evenly distributed around the axis of the positioning plate and form an angle of 30° to 90° with the upper end face of the positioning plate. The outer side of the bearing keel is provided with at least one connecting slide rail, and the connecting slide rail is connected to the sampling tank. The sampling tank is also connected to the discharge port through a guide pipe.

6. The method for classifying the strength grade of coal seam boreholes and blowholes according to claim 5, characterized in that: The sampling tank includes a support tank body, a drain outlet, a liquid level sensor, a turbidity sensor, an upper end cover, and a lower end cover. The support tank body is a cylindrical hollow tubular structure, with its upper and lower end faces connected to the upper and lower end covers to form a closed cavity structure. The upper end cover has an inlet and an outlet, which are connected to a guide pipe through the inlet. The lower end cover has a drain outlet, and the inlet and outlet are symmetrically distributed on both sides of the axis of the support tank body. The inner side of the support tank body is equipped with a liquid level sensor and at least one turbidity sensor, and the turbidity sensor is located below the outlet and coaxially distributed with the outlet. Both the liquid level sensor and the turbidity sensor are electrically connected to the wiring terminals.

7. The method for classifying the strength grade of coal seam boreholes and blowouts according to claim 4, characterized in that: At least one flow channel is evenly distributed on the upper surface of the guide plate. A retaining ring is provided at the guide hole position corresponding to the flow channel. The retaining ring is embedded in the guide hole and is coaxially distributed with the guide hole. The upper and lower surfaces of the guide hole extend at least 10 mm beyond the upper and lower surfaces of the guide plate.

8. The method for classifying the strength grade of coal seam boreholes and blowouts according to claim 4, characterized in that: The driving circuit is a circuit system based on either a programmable controller or an FPGA chip; the data processing system is a cloud computing-based network server.

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