Coal-rock interface identification and detection device and method along coal seam while drilling

Abstract

The present invention provides a device and method for identifying and detecting coal-rock interface while drilling along a coal seam. The device comprises: a control host and a drilling rig connected to the control host, the drilling rig is connected to a drill rod, and the end of the drill rod is a detection probe while drilling; the detection probe while drilling comprises a probe body, and a retractable elastic wave transmitter, a retractable elastic wave receiving sensor and a control and acquisition circuit board of the detection probe while drilling are provided on the probe body. The present invention uses a drilling rig to push the detection probe while drilling into a borehole, and the detection probe while drilling will automatically and intelligently transmit elastic waves to the top and bottom plates of the coal seam during the pushing and rotating process, and the elastic wave receiving sensor will receive the elastic wave signal reflected back by the top and bottom plates of the coal seam, and calculate the thickness of the top and bottom plates of the coal seam according to the time of the received elastic wave and the elastic wave velocity of the coal seam, so as to realize the identification of the coal-rock interface between the top and bottom plates of the coal seam; and then the thickness of the top and bottom plates of the coal seam can be quickly and accurately detected, so as to realize the identification of the coal-rock interface between the top and bottom plates of the coal seam.

Description

Technical Field

[0001] The present invention relates to the technical field of coal-rock interface detection in intelligent coal mining, and in particular to a device and method for identifying and detecting coal-rock interfaces while drilling along coal seams. Background Art

[0002] With the in-depth promotion and application of intelligent and unmanned mining technology in my country's working faces, the construction of smart mines is an inevitable trend in the future development of coal mines. Elastic wave detection along the coal seam drilling can serve the establishment of a high-precision three-dimensional dynamic geological model of the working face, and will transform the coal mining machine from the previous passive adjustment of "memory cutting" to "anticipated cutting" that actively adapts to changes in coal seam thickness. It can provide strong geological support for intelligent and unmanned mining, improve the efficiency of coal mining machines, and increase the recovery rate of working faces. Overall, it can help to quickly promote intelligent and unmanned coal mining technology. At the same time, it can take this opportunity to drive the promotion of fine detection and geological information platforms.

[0003] At present, there are more than 20 kinds of coal-rock boundary sensing mechanisms and systems, such as memory program control systems, vibration spectrum sensing systems, natural gamma rays, force measuring picks, isotopes, noise, infrared, ultraviolet, ultrasonic, radio waves, radar detection, etc. However, due to the very complex conditions of underground coal seams and surrounding rocks, it is difficult to accurately and reliably judge the coal-rock boundary, and none of them have been successfully applied in practice. Summary of the invention

[0004] Based on the above-mentioned purpose, the present disclosure provides, in the first aspect, a coal-rock interface identification and detection device for drilling along a coal seam, which is used for detection in a tunnel between a coal seam floor interface and a coal seam roof interface, and includes a control host and a drilling rig connected to the control host, the drilling rig is connected to a drill rod, and the end of the drill rod is a drilling detection probe; the drilling detection probe includes a probe body, and the probe body is provided with a retractable elastic wave transmitter, a retractable elastic wave receiving sensor and a drilling detection probe control and acquisition circuit board, the retractable elastic wave receiving sensor is located at the front end of the probe body close to the forward direction, the drilling detection probe control and acquisition circuit board is arranged between the retractable elastic wave transmitter and the retractable elastic wave receiving sensor, the rear end of the retractable elastic wave transmitter is also provided with a drilling detection probe centerer, and the rear end of the probe body is provided with a threaded joint for connecting the drill rod.

[0005] In some optional embodiments, an elastic wave transmitter vibration reduction cavity is opened on the probe body, and the retractable elastic wave transmitter is arranged in the elastic wave transmitter vibration reduction cavity; the elastic wave receiving sensor vibration reduction cavity is used to isolate the vibration coupling of the elastic wave transmitter from being transmitted to the retractable elastic wave receiving sensor.

[0006] In some optional embodiments, an elastic wave receiving sensor vibration damping cavity is further provided on the probe body, and the retractable elastic wave receiving sensor is arranged in the elastic wave receiving sensor vibration damping cavity; the elastic wave receiving sensor vibration damping cavity is used to isolate the vibration coupling of the drill pipe from being transmitted to the retractable elastic wave receiving sensor.

[0007] In some optional embodiments, one end of the drilling detection probe control and acquisition circuit board is connected to the retractable elastic wave receiving sensor through a receiving sensor cable, and the other end of the drilling detection probe control and acquisition circuit board is connected to the retractable elastic wave transmitter through a transmitter cable.

[0008] In some optional embodiments, a detection-while-drilling probe circuit cavity is further provided on the probe body, and the detection-while-drilling probe control and acquisition circuit board is embedded in the detection-while-drilling probe circuit cavity.

[0009] In some optional embodiments, the retractable elastic wave transmitter and the retractable elastic wave receiving sensor are used to ensure that the transmitter and the receiving sensor are in good contact with the borehole wall, ensuring that the elastic waves emitted by the transmitter can be coupled into the coal seam, and the reflected elastic waves can be coupled from the coal seam to the receiving sensor.

[0010] In some optional embodiments, the detection while drilling probe control and acquisition circuit board includes an elastic wave transmitting circuit, an elastic wave receiving circuit, a three-dimensional inertial navigation sensor, a battery, a wireless network module and a memory connected to a single-chip microcomputer.

[0011] In some optional embodiments, the three-dimensional inertial navigation sensor can measure the rotation angle of the drill pipe. When the retractable elastic wave transmitter and the retractable elastic wave receiving sensor rotate to face the roof coal seam, the elastic wave transmitter automatically transmits elastic waves and the elastic wave receiving sensor receives the echo reflected from the interface of the roof coal seam; when the retractable elastic wave transmitter and the retractable elastic wave receiving sensor rotate to face the bottom coal seam, the elastic wave transmitter automatically transmits elastic waves and the elastic wave receiving sensor receives the echo reflected from the interface of the bottom coal seam; the three-dimensional inertial navigation sensor can also measure the direction and inclination of the borehole.

[0012] In some optional embodiments, the control host records the addition of a drill rod each time the drilling rig advances a drill rod, and records the drilling depth of the drilling detection probe; the control host generates an elastic wave profile of the coal seam roof detection and an elastic wave profile of the bottom plate detection based on the data stored in the drilling detection probe and the recorded drilling depth, and extracts the thickness of the roof coal seam and the thickness of the bottom coal seam; and calculates the coordinates of the top and bottom plates of the coal seam according to the direction, inclination, depth of the drilling and the thickness of the top and bottom plates of the coal seam.

[0013] In a second aspect, a method for identifying and detecting a coal-rock interface while drilling along a coal seam is also disclosed, the method comprising:

[0014] The drilling rig is used to push the drilling detection probe into the borehole. During the pushing and rotating process, the drilling detection probe will automatically and intelligently transmit elastic waves to the roof and floor of the coal seam. The elastic wave receiving sensor will receive the elastic wave signals reflected by the roof and floor of the coal seam.

[0015] The three-dimensional inertial navigation sensor of the drilling detection probe measures the drilling posture of the drilling detection point, and calculates the thickness of the roof and bottom plates of the coal seam according to the time of the elastic waves reflected back from the roof and bottom plates and the elastic wave velocity of the coal seam;

[0016] The three-dimensional coordinates of the detection point can be calculated based on the drilling posture and drilling depth of the detection point, and then the top and bottom plate coordinates of the coal seam can be calculated based on the coal seam thickness of the top and bottom plates at the detection point and the three-dimensional coordinates of the detection point, thereby achieving the recognition function of the coal-rock interface.

[0017] In some optional embodiments, the method further includes: requiring the drilling rig to rotate the drill rod for one circle each time a drill rod is advanced using the while drilling detection probe, and the three-dimensional inertial navigation sensor in the while drilling detection probe automatically transmits elastic waves to the coal seam roof and coal seam floor and receives elastic waves according to the state of the while drilling detection probe;

[0018] The posture of the detection point is measured, and the posture of the detection point and the received elastic wave signal are digitally stored in the memory of the control and acquisition circuit board of the drilling detection probe.

[0019] In some optional embodiments, the method further includes: the host records once each time the drilling rig pushes a drill rod, and when the drilling detection probe exits the borehole, all the data stored in the drilling detection probe is transmitted to the control host through the wireless network module, and the control host automatically fuses and generates the three-dimensional coordinates of the drilling detection point according to the recorded number of drill rods;

[0020] The control host calculates the coal seam thickness of the coal seam roof and floor through analysis, and then calculates the three-dimensional coordinates of the coal seam roof and floor according to the drilling coordinates of the detection point.

[0021] In some optional embodiments, the elastic wave velocity of the coal seam is determined based on the known thickness of the coal seam and the reflection wave time of the coal-rock interface;

[0022] Wherein, the elastic wave velocity of the coal seam is Vcoal, the distance from the borehole to the coal-rock interface of the coal seam is Lboundary, and the read reflection wave time is treflection. The method for determining the elastic wave velocity of the coal seam is as follows:

[0023] V 煤 =L 边界 / 2t反射 .

[0024] From the above, it can be seen that the present invention provides a device and method for identifying and detecting the coal-rock interface while drilling along the coal seam. A drilling rig is used to push the drilling detection probe into the borehole. The drilling detection probe will automatically and intelligently transmit elastic waves to the roof and floor of the coal seam during the advancement and rotation process. The elastic wave receiving sensor will receive the elastic wave signals reflected from the roof and floor of the coal seam. The thickness of the roof and floor of the coal seam can be calculated based on the time of the elastic waves reflected from the roof and floor and the elastic wave velocity of the coal seam, thereby realizing the identification of the coal-rock interface between the roof and floor of the coal seam; and then the thickness of the roof and floor of the coal seam can be detected quickly and accurately, thereby realizing the identification of the coal-rock interface between the roof and floor of the coal seam, and providing services for intelligent coal mining. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the technical solutions in the present disclosure or related technologies, the drawings required for use in the embodiments or related technical descriptions are briefly introduced below. Obviously, the drawings described below are only embodiments of the present disclosure. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0026] Figure 1 A reference diagram of the use state of the detection device according to an embodiment of the present disclosure;

[0027] Figure 2 It is a schematic diagram of the structure of a detection while drilling probe of the detection device of an embodiment of the present disclosure;

[0028] Figure 3 It is a principle block diagram of a control and acquisition circuit board of a detection while drilling probe of the device according to an embodiment of the present disclosure;

[0029] Figure 4 A schematic diagram of the results of the while-drilling elastic wave coal-rock interface detection of the device according to an embodiment of the present disclosure;

[0030] Explanation of the reference numerals in the accompanying drawings: 1. test host, 2. downhole detection probe, 3. drilling rig, 4. drill rod, 5. borehole, 6. tunnel, 7. coal seam floor interface, 8. coal seam roof interface, 2.0. probe body, 2.1. retractable elastic wave transmitter, 2.2. retractable elastic wave receiving sensor, 2.3. downhole detection probe circuit cavity, 2.4. downhole detection probe control and acquisition circuit board, 2.5. elastic wave transmitter vibration reduction cavity, 2.6. elastic wave receiving sensor vibration reduction cavity, 2.7. transmitter cable, 2.8. receiving sensor cable, 2.9. downhole detection probe centerer, 2.10. threaded joint of downhole detection probe, 2.4.1. elastic wave transmitting circuit, 2.4.2. elastic wave receiving circuit, 2.4.3. three-dimensional inertial navigation sensor, 2.4.4. battery, 2.4.5. single-chip microcomputer, 2.4.6. wireless network, 2.4.7. memory. DETAILED DESCRIPTION

[0031] In order to make the objectives, technical solutions and advantages of the present disclosure more clearly understood, the present disclosure is further described in detail below in combination with specific embodiments and with reference to the accompanying drawings.

[0032] It should be noted that, unless otherwise defined, the technical terms or scientific terms used in the embodiments of the present disclosure should be understood by people with ordinary skills in the field to which the present disclosure belongs. The "first", "second" and similar words used in the embodiments of the present disclosure do not indicate any order, quantity or importance, but are only used to distinguish different components. "Including" or "comprising" and similar words mean that the elements or objects appearing before the word cover the elements or objects listed after the word and their equivalents, without excluding other elements or objects. "Connect" or "connected" and similar words are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. "Up", "down", "left", "right" and the like are only used to indicate relative positional relationships. When the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0033] This embodiment discloses a device for detecting coal-rock interface while drilling along a coal seam. Figure 1 As shown, it is used for detection in a tunnel 6 between a coal seam floor interface 7 and a coal seam roof interface 8, comprising a control host 1, a drilling rig 3 connected to the control host 1, the drilling rig 3 is connected to a drill rod 4 and drives the drill rod 4 to rotate, and the end of the drill rod is a drilling detection probe 2, so that the drilling detection probe 2 and the drill rod 4 are in a borehole 5;

[0034] Combination Figure 2As shown, the drilling detection probe includes a probe body 2.0, on which a retractable elastic wave transmitter 2.1, a retractable elastic wave receiving sensor 2.2 and a drilling detection probe control and acquisition circuit board 2.4 are provided. The retractable elastic wave receiving sensor 2.2 is located at the front end of the probe body 2.0 close to the forward direction, and the drilling detection probe control and acquisition circuit board 2.4 is arranged between the retractable elastic wave transmitter 2.1 and the retractable elastic wave receiving sensor 2.2. A drilling detection probe centerer 2.9 is also arranged at the rear end of the retractable elastic wave transmitter 2.1, and a threaded joint 2.10 for connecting the drill pipe 4 is arranged at the rear end of the probe body 2.0.

[0035] Furthermore, the probe body 2.0 is provided with an elastic wave transmitter vibration reduction cavity 2.5, and the retractable elastic wave transmitter 2.1 is arranged in the elastic wave transmitter vibration reduction cavity 2.5; the probe body 2.0 is also provided with an elastic wave receiving sensor vibration reduction cavity 2.6, and the retractable elastic wave receiving sensor 2.2 is arranged in the elastic wave receiving sensor vibration reduction cavity 2.6;

[0036] It should be noted that the elastic wave receiving sensor vibration reduction cavity 2.5 is used to isolate the vibration coupling of the elastic wave transmitter 2.1 from being transmitted to the retractable elastic wave receiving sensor 2.2; the elastic wave receiving sensor vibration reduction cavity 2.6 is used to isolate the vibration coupling of the drill pipe 4 from being transmitted to the retractable elastic wave receiving sensor 2.2; the elastic wave transmitter vibration reduction cavity 2.5 and the elastic wave receiving sensor vibration reduction cavity 2.6 of the downhole detection probe can isolate the vibration of the elastic wave transmitter 2.1 and the vibration coupling of the downhole drill pipe 4 from being received by the retractable elastic wave receiving sensor 2.2; the probe body 2.0 is also provided with a downhole detection probe circuit cavity 2.3, and the downhole detection probe control and acquisition circuit board 2.4 is embedded in the downhole detection probe circuit cavity 2.3.

[0037] The retractable elastic wave transmitter 2.1 and the retractable elastic wave receiving sensor 2.2 are used to ensure that the transmitter 2.1 and the receiving sensor 2.2 are in good contact with the wall of the borehole 5, ensuring that the elastic wave emitted by the transmitter 2.1 can be coupled into the coal seam, and the reflected elastic wave can be coupled from the coal seam to the receiving sensor 2.2.

[0038] In addition, one end of the drilling detection probe control and acquisition circuit board 2.4 is connected to the retractable elastic wave receiving sensor 2.2 through a receiving sensor cable 2.8, and the other end of the drilling detection probe control and acquisition circuit board 2.4 is connected to the retractable elastic wave transmitter 2.1 through a transmitter cable 2.7; the retractable elastic wave transmitter 2.1 and the retractable elastic wave receiving sensor 2.2 are controlled by the drilling detection probe control and acquisition circuit board 2.4.

[0039] Combination Figure 3 As shown, the control and acquisition circuit board 2.4 of the drilling detection probe includes an elastic wave transmitting circuit 2.4.1, an elastic wave receiving circuit 2.4.2, a three-dimensional inertial navigation sensor 2.4.3, a battery 2.4.4, a wireless network module 2.4.6 and a memory 2.4.7 connected to a single-chip computer 2.4.5. The three-dimensional inertial navigation sensor 2.4.3 can measure the rotation angle of the drill pipe 4. When the retractable elastic wave transmitter 2.1 and the retractable elastic wave receiving sensor 2.2 rotate to face the roof coal seam 8, the elastic wave transmitter 2.1 automatically transmits elastic waves and the elastic wave receiving sensor 2.2 receives the echo reflected from the roof coal seam interface 8; when the retractable elastic wave transmitter 2.1 and the retractable elastic wave receiving sensor 2.2 rotate to face the bottom coal seam 7, the elastic wave transmitter 2.1 automatically transmits elastic waves and the elastic wave receiving sensor 2.2 receives the echo reflected from the bottom coal seam interface 7;

[0040] The three-dimensional inertial navigation sensor 2.4.3 can also measure the direction and inclination of the borehole 5.

[0041] In some optional embodiments, the control host 1 records each time when the drilling rig 3 pushes a drill rod 4, and records the drilling depth of the drilling detection probe 2 pushed forward;

[0042] like Figure 4 As shown, the control host 1 generates elastic wave profiles of coal seam roof detection and bottom plate detection according to the data stored in the drilling detection probe 2 and the recorded drilling depth, and extracts the thickness of the roof coal seam and the thickness of the bottom coal seam; the coordinates of the top and bottom plates of the coal seam are calculated according to the direction, inclination, depth of the drilling and the thickness of the top and bottom plates of the coal seam.

[0043] From the above description, it can be seen that the device and method for identifying and detecting the coal-rock interface while drilling along the coal seam provided in this embodiment use a drilling rig to push the drilling detection probe into the borehole. The drilling detection probe will automatically and intelligently transmit elastic waves to the roof and floor of the coal seam during the advancement and rotation process. The elastic wave receiving sensor will receive the elastic wave signal reflected from the roof and floor of the coal seam. The thickness of the roof and floor of the coal seam can be calculated according to the time of the elastic waves reflected from the roof and floor and the elastic wave velocity of the coal seam, thereby realizing the identification of the coal-rock interface between the roof and floor of the coal seam; and then the thickness of the roof and floor of the coal seam can be detected quickly and accurately, thereby realizing the identification of the coal-rock interface between the roof and floor of the coal seam, and providing services for intelligent coal mining.

[0044] In some optional embodiments, a method for identifying and detecting a coal-rock interface while drilling along a coal seam is disclosed, the method comprising the following steps:

[0045] S1: Use a drilling rig to push the detection probe while drilling into the borehole. During the pushing and rotating process, the detection probe while drilling will automatically and intelligently transmit elastic waves to the roof and floor of the coal seam. The elastic wave receiving sensor will receive the elastic wave signals reflected by the roof and floor of the coal seam.

[0046] S2: The three-dimensional inertial navigation sensor of the drilling detection probe measures the drilling posture of the drilling detection point, and calculates the thickness of the roof and bottom plates of the coal seam according to the time of the elastic waves reflected from the roof and bottom plates and the elastic wave velocity of the coal seam;

[0047] S3: The three-dimensional coordinates of the detection point can be calculated through the drilling posture and drilling depth of the detection point, and then the top and bottom plate coordinates of the coal seam are calculated according to the coal seam thickness of the top and bottom plates of the detection point and the three-dimensional coordinates of the detection point, thereby achieving the recognition function of the coal-rock interface.

[0048] Furthermore, the method may also include:

[0049] S4: When the drilling probe is used to advance a drill rod, the drilling rig is required to rotate the drill rod for one circle, and the three-dimensional inertial navigation sensor in the drilling probe automatically transmits elastic waves to the coal seam roof and coal seam floor and receives elastic waves according to the state of the drilling probe;

[0050] S5: measuring the posture of the detection point, and digitally storing the posture of the detection point and the received elastic wave signal in the memory of the control and acquisition circuit board of the drilling detection probe.

[0051] The method further comprises:

[0052] S6: The host computer records each time when the drilling rig pushes a drill rod, and when the drilling detection probe exits the borehole, all the data stored in the drilling detection probe is transmitted to the control host computer through the wireless network module, and the control host automatically generates the three-dimensional coordinates of the drilling detection point according to the recorded number of drill rods;

[0053] S7: The control host calculates the coal seam thickness of the coal seam roof and floor through analysis, and then calculates the three-dimensional coordinates of the coal seam roof and floor according to the drilling coordinates of the detection point.

[0054] The elastic wave velocity of the coal seam is determined based on the known coal seam thickness and the reflection wave time of the coal-rock interface;

[0055] Wherein, the elastic wave velocity of the coal seam is Vcoal, the distance from the borehole to the coal-rock interface of the coal seam is Lboundary, and the read reflection wave time is treflection. The method for determining the elastic wave velocity of the coal seam is as follows:

[0056] V 煤 =L 边界 / 2t 反射

[0057] Similarly, this method uses a drilling rig to push the drilling detection probe into the borehole. The drilling detection probe will automatically and intelligently transmit elastic waves to the roof and floor of the coal seam during the advancement and rotation process. The elastic wave receiving sensor will receive the elastic wave signal reflected from the roof and floor of the coal seam. The thickness of the roof and floor of the coal seam can be calculated based on the time of the elastic wave reflected from the roof and floor and the elastic wave velocity of the coal seam, thereby realizing the recognition of the coal-rock interface of the roof and floor of the coal seam. The method of this specification can quickly and accurately detect the thickness of the roof and floor of the coal seam, thereby realizing the recognition of the coal-rock interface of the roof and floor of the coal seam, and providing services for intelligent mining of coal mines.

[0058] It should be noted that the above describes some embodiments of the present disclosure. Other embodiments are within the scope of the appended claims. In some cases, the actions or steps recorded in the claims can be performed in an order different from that in the above embodiments and still achieve the desired results. In addition, the processes depicted in the accompanying drawings do not necessarily require the specific order or continuous order shown to achieve the desired results. In some embodiments, multitasking and parallel processing are also possible or may be advantageous.

[0059] Those skilled in the art should understand that the discussion of any of the above embodiments is merely illustrative and is not intended to imply that the scope of the present disclosure (including the claims) is limited to these examples. Based on the concept of the present disclosure, the technical features in the above embodiments or different embodiments may be combined, the steps may be implemented in any order, and there are many other variations of the different aspects of the embodiments of the present disclosure as described above, which are not provided in detail for the sake of simplicity.

[0060] The embodiments of the present disclosure are intended to cover all such substitutions, modifications and variations that fall within the broad scope of the appended claims. Therefore, any omissions, modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the embodiments of the present disclosure should be included in the scope of protection of the present disclosure.

Claims

1. A coal-rock interface identification and detection device for drilling along a coal seam, used for detection in a tunnel between a coal seam floor interface and a coal seam roof interface, characterized in that: include: A control host and a drilling rig connected to the control host, wherein the drilling rig is connected to a drill rod, and an end of the drill rod is a drilling detection probe; The drilling detection probe comprises a probe body, on which a retractable elastic wave transmitter, a retractable elastic wave receiving sensor and a drilling detection probe control and acquisition circuit board are arranged, the retractable elastic wave receiving sensor is located at the front end of the probe body close to the forward direction, the drilling detection probe control and acquisition circuit board is arranged between the retractable elastic wave transmitter and the retractable elastic wave receiving sensor, the rear end of the retractable elastic wave transmitter is also provided with a drilling detection probe centerer, and the rear end of the probe body is provided with a threaded joint for connecting the drill pipe; wherein, The retractable elastic wave transmitter and the retractable elastic wave receiving sensor are used to ensure that the transmitter and the receiving sensor are in contact with the borehole wall, so that the elastic wave emitted by the transmitter can be coupled into the coal seam, and the reflected elastic wave can be coupled from the coal seam to the receiving sensor; The control and acquisition circuit board of the drilling detection probe includes a three-dimensional inertial navigation sensor; the three-dimensional inertial navigation sensor can measure the rotation angle of the drill pipe, and when the retractable elastic wave transmitter and the retractable elastic wave receiving sensor rotate to face the roof coal seam, the elastic wave transmitter automatically transmits elastic waves and the elastic wave receiving sensor receives the echo reflected from the roof coal seam interface; when the retractable elastic wave transmitter and the retractable elastic wave receiving sensor rotate to face the bottom coal seam, the elastic wave transmitter automatically transmits elastic waves and the elastic wave receiving sensor receives the echo reflected from the bottom coal seam interface; The probe body is provided with an elastic wave transmitter vibration reduction cavity, and the retractable elastic wave transmitter is arranged in the elastic wave transmitter vibration reduction cavity; The elastic wave receiving sensor vibration reduction cavity is used to isolate the vibration coupling of the elastic wave transmitter from being transmitted to the retractable elastic wave receiving sensor; The probe body is also provided with an elastic wave receiving sensor vibration reduction cavity, and the retractable elastic wave receiving sensor is arranged in the elastic wave receiving sensor vibration reduction cavity; The elastic wave receiving sensor vibration reduction cavity is used to isolate the vibration coupling of the drill pipe from being transmitted to the retractable elastic wave receiving sensor; The three-dimensional inertial navigation sensor can also measure the direction and inclination of the borehole; The control host records each time the drilling rig pushes a drill rod, records the addition of a drill rod, and records the drilling depth of the drilling detection probe pushed forward; The control host generates elastic wave profiles of coal seam roof detection and bottom plate detection based on the data stored in the drilling detection probe and the recorded drilling depth, and extracts the thickness of the roof coal seam and the thickness of the bottom coal seam; the coordinates of the top and bottom plates of the coal seam are calculated according to the direction, inclination, depth of the drilling hole and the thickness of the top and bottom plates of the coal seam.

2. The device for identifying and detecting coal-rock interface while drilling along the coal seam according to claim 1 is characterized in that: The probe body is also provided with a detection-while-drilling probe circuit cavity, and the detection-while-drilling probe control and acquisition circuit board is embedded in the detection-while-drilling probe circuit cavity.

3. The device for identifying and detecting coal-rock interface while drilling along the coal seam according to claim 1 is characterized in that: One end of the drilling detection probe control and collection circuit board is connected to the retractable elastic wave receiving sensor through a receiving sensor cable, and the other end of the drilling detection probe control and collection circuit board is connected to the retractable elastic wave transmitter through a transmitter cable.

4. The device for identifying and detecting coal-rock interface while drilling along the coal seam according to claim 1, characterized in that: The control and acquisition circuit board of the detection while drilling probe comprises an elastic wave transmitting circuit, an elastic wave receiving circuit, a battery, a wireless network module and a memory connected to a single chip microcomputer.

5. A method for identifying and detecting coal-rock interfaces while drilling along coal seams, characterized in that: include: The drilling rig is used to push the drilling detection probe into the borehole. During the pushing and rotating process, the drilling detection probe will automatically and intelligently transmit elastic waves to the roof and floor of the coal seam. The elastic wave receiving sensor will receive the elastic wave signals reflected by the roof and floor of the coal seam. The three-dimensional inertial navigation sensor of the drilling detection probe measures the drilling posture of the drilling detection point, and calculates the thickness of the roof and bottom plates of the coal seam according to the time of the elastic waves reflected back from the roof and bottom plates and the elastic wave velocity of the coal seam; The three-dimensional coordinates of the detection point can be calculated by the drilling posture and the drilling depth of the detection point. Then, the top and bottom plate coordinates of the coal seam are calculated according to the coal seam thickness of the top and bottom plates of the detection point and the three-dimensional coordinates of the detection point, thereby achieving the recognition function of the coal-rock interface. When the drilling probe is used, the drilling rig is required to rotate the drill rod for one circle each time a drill rod is pushed forward. The three-dimensional inertial navigation sensor in the drilling probe automatically transmits elastic waves to the coal seam roof and coal seam floor and receives elastic waves according to the state of the drilling probe. Measuring the posture of the detection point, and digitally storing the posture of the detection point and the received elastic wave signal in the memory of the control and acquisition circuit board of the drilling detection probe; The control host records each time the drilling rig pushes a drill rod. When the drilling detection probe exits the borehole, all the data stored in the drilling detection probe is transmitted to the control host through the wireless network module. The control host automatically generates the three-dimensional coordinates of the drilling detection point based on the recorded number of drill rods. The control host calculates the coal seam thickness of the coal seam roof and floor by analysis, and then calculates the three-dimensional coordinates of the coal seam roof and floor according to the drilling coordinates of the detection point; the elastic wave velocity of the coal seam is determined according to the known coal seam thickness and the reflection wave time of the coal-rock interface; Wherein, the elastic wave velocity of the coal seam is Vcoal, the distance from the borehole to the coal-rock interface of the coal seam is Lboundary, and the read reflection wave time is treflection. The method for determining the elastic wave velocity of the coal seam is as follows: V 煤 =L 边界 / 2t 反射 。

Images