A coal mine underground directional drilling coal seam sealing pressure maintaining gas sampling device

Abstract

The utility model discloses a kind of coal mine underground directional drilling coal bed airtight pressure maintaining gas sampling devices, including guide belt, the movable front end of guide belt is sequentially equipped with negative pressure bin, storage bin, working head;The negative pressure bin with the storage bin is connected through air guide valve intercommunication;Through feed hole is penetrated on the lateral wall of the storage bin;The working head front end is equipped with advancing assembly, the storage bin outside slide installation has sealing sleeve, the working head is equipped with electric telescopic rod inside.The beneficial effect is that: drilling and advancing are carried out using advancing assembly auxiliary device, after driving sealing sleeve movement control feed hole opening by electric telescopic rod, cooperate with gas filter cotton to carry out simple filtration treatment to gas, to assist gas to be collected in negative pressure bin, ensure the sealing property and effective collection of gas in sampling process, the device effectively improves the efficiency and safety of gas sampling process, improves coal mine operation gas collection effect.

Description

Technical Field

[0001] This utility model relates to the field of coal mine sampling, specifically to a sealed pressure-maintaining gas sampling device for directional drilling of coal seams in underground coal mines. Background Technology

[0002] The collection of underground gas samples in coal mines is of great significance. It can accurately obtain parameters such as gas concentration and composition, providing data support for early warning of gas outbursts and preventing safety accidents such as explosions and poisoning. It can also help to formulate scientific gas drainage plans and improve management efficiency. Furthermore, it can analyze the potential of gas resources and lay the foundation for their resource utilization. At the same time, it meets the requirements of coal mine safety supervision and ensures compliance of underground operations. It is a key link in ensuring safe production, efficient management and resource development in coal mines.

[0003] Comparing this to Chinese patent CN 220650210U, which discloses a handheld gas sampling device, the device includes a cylinder. An inlet valve is fixedly installed on the outer surface of the cylinder, and an outlet valve is fixedly installed at the lower end of the cylinder. A sealing end cap is provided at the upper end of the cylinder, and a piston rod is perforated through the surface of the sealing end cap. A connecting plate is provided at the upper end of the piston rod, and a threaded post is fixedly connected to the lower end of the connecting plate. A threaded hole is formed on the upper surface of the piston rod. A hand grip is provided at the upper end of the connecting plate, and a magnet is fixedly installed on the lower surface of the hand grip. An iron sheet is fixedly connected to the upper surface of the connecting plate, and a connecting groove is formed on the side surface of the connecting plate.

[0004] The aforementioned gas sampling devices are only applicable to simple sampling scenarios in shallow underground layers, where there are no boreholes or short-distance boreholes. However, directional drilling in coal mines typically reaches depths of 50-200 meters, and the borehole path extends in a directional manner. Handheld devices cannot penetrate deep into the borehole to reach the target coal seam, nor can they simultaneously complete sampling during borehole movement. This fails to meet the long-distance, precise positioning and sampling requirements of "directional drilling." Furthermore, the underground directional drilling operation area is narrow and has a high gas concentration. When personnel operate the handheld device close to the borehole opening, they are exposed to a high-risk environment, which can easily lead to safety accidents such as gas poisoning and explosions. This does not comply with the safety operation standards for "remote control" in coal mines.

[0005] Therefore, there is a need for a coal seam sealed pressure-maintaining gas sampling device with long-distance, depth-adaptable, and high sampling safety in underground directional drilling to solve the above problems. Utility Model Content

[0006] The purpose of this utility model is to provide a closed-loop pressure-maintaining gas sampling device for directional drilling in coal mines, so as to solve the problems of limited applicable scenarios, inability to adapt to directional drilling operations, and low sampling safety in the existing technology.

[0007] The purpose of this utility model is achieved as follows:

[0008] This utility model provides a coal seam sealed pressure-maintaining gas sampling device for directional drilling in coal mines, comprising a conveyor belt, with a negative pressure chamber, a storage chamber, and a working head sequentially arranged at the movable front end of the conveyor belt; the negative pressure chamber and the storage chamber are connected by a gas valve; a feed hole is penetrating the side wall of the storage chamber, and gas filter cotton is provided inside the storage chamber; a traveling component is provided at the front end of the working head, and a sealing sleeve for sealing the feed hole is slidably installed on the outside of the storage chamber; an electric telescopic rod is provided inside the working head to assist the sealing sleeve in sliding back and forth, thereby assisting the opening and closing of the feed hole by driving the sealing sleeve to slide.

[0009] As an optional solution to the technical solution of this application, a support ring is provided between the negative pressure chamber and the storage chamber, which are used to support the negative pressure chamber and the storage chamber respectively.

[0010] As an optional solution to the technical solution of this application, the storage bin includes a storage cup connected to the movable end of the air valve. The storage cup is provided with gas filter cotton. A protective frame is hinged at the opening of the storage cup. The length of the protective frame is greater than the length of the storage cup. The feed hole penetrates through the side wall of the protective frame. A movable sliding sleeve is provided on the outer wall of the storage cup to assist in fixing the protective frame. The protective frame is further fixed by pressing against the outer wall of the protective frame.

[0011] As an optional solution to the technical solution of this application, the conveyor belt is provided with a guide sleeve, the guide sleeve is connected and fixed to the negative pressure chamber, the inner end of the sliding sleeve is slidably engaged with the guide sleeve, the sliding sleeve is connected to the guide sleeve by bolts, and the movable end of the sliding sleeve extends to the guard frame and is slidably engaged with the outer wall of the guard frame.

[0012] As an optional solution to the technical solution of this application, the support ring is slidably engaged with the sliding sleeve (102), and the air valve is located in the middle of the support ring.

[0013] As an optional solution to the technical solution of this application, the inner wall of the working head is provided with a connecting frame, and the traveling component and the electric telescopic rod are both fixedly installed with the connecting frame. The connecting frame is connected to the sealed end of the protective frame through a rod-like structure.

[0014] As an optional solution to the technical solution of this application, the traveling component includes a motor, the output end of which is connected to a rotating frame. The rotating frame is rotatably disposed on the outside of the working head. The rotating frame includes helical blades located on the outer circular surface of the motor. The rotating frame has helical blades on its outer circular surface and a plurality of crushing cutter heads on its front surface to assist the device in drilling and traveling in the coal seam.

[0015] As an optional solution to the technical solution of this application, the sealing sleeve includes a sealing ring that slides on the outside of the guard, and the sealing ring is correspondingly provided with the feed hole; the sealing ring is provided with a plug sleeve on the side facing the working head, the plug sleeve is slidably engaged with the inner wall of the working head, and the telescopic end of the electric telescopic rod is connected to the sealing ring.

[0016] As an optional solution to the technical solution of this application, the outer wall of the storage bin is provided with a sliding groove extending along its axial direction, and both the sliding sleeve and the sealing ring are provided with protrusions that slide corresponding to the outer wall of the storage bin.

[0017] Positive and beneficial effects: This utility model utilizes a traveling component auxiliary device for drilling and travel. After the inlet hole is opened by controlling the movement of the sealing sleeve via an electric telescopic rod, the gas and solids in the hole will enter the storage bin. In conjunction with the gas filter cotton, the gas is simply filtered to assist in the collection of methane gas in the negative pressure chamber, ensuring the sealing during the sampling process and the effective collection of methane gas. This device effectively improves the efficiency and safety of the methane sampling process, can adapt to long-distance and depth-adapted drilling and sample collection tasks, reduces the risks of manual operation, and improves the methane collection effect in coal mine operations. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the internal structure of the present invention;

[0019] Figure 2 This is the front view of the present utility model;

[0020] Figure 3 This is a schematic diagram of the connecting frame in this utility model;

[0021] Figure 4 This is a schematic diagram of the left side of the rotating frame in this utility model;

[0022] The diagram shows: 1. Conveyor belt, 101. Guide sleeve, 102. Sliding sleeve, 2. Negative pressure chamber, 201. Air pressure sensor, 202. Air valve, 203. Support ring, 3. Storage bin, 301. Storage cup, 302. Protective frame, 303. Feed hole, 4. Working head, 5. Connecting frame, 6. Traveling assembly, 601. Motor, 602. Rotating frame, 603. Spiral blade, 604. Crusher head, 7. Electric telescopic rod, 8. Sealing sleeve, 801. Sealing ring, 802. Detailed Implementation

[0023] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0024] First embodiment:

[0025] See Figures 1-4 As shown, this utility model provides a coal seam sealed pressure-maintaining gas sampling device for directional drilling in coal mines. It includes a conveyor belt 1, which has a certain degree of toughness and flexibility. At the movable front end of the conveyor belt 1, a negative pressure chamber 2, a storage chamber 3, and a working head 4 are sequentially arranged. The negative pressure chamber 2 and the storage chamber 3 are connected by a gas valve 202. A feed hole 303 penetrates the side wall of the storage chamber 3, and gas filter cotton is installed inside the storage chamber 3. At the front end of the working head 4, a traveling component 6 is provided. A sealing sleeve 8 for sealing the feed hole 303 is slidably installed on the outside of the storage chamber 3. An electric telescopic rod 7 is provided inside the working head 4 to assist the sealing sleeve 8 in sliding back and forth, thereby assisting in the opening and closing of the feed hole 303. The device includes a conveyor belt 1, at which, at its flexibly movable front end, a negative pressure chamber 2 for creating a negative pressure environment, a storage chamber 3 for temporarily storing sampled materials and gas, and a working head 4 for installing the drilling structure are sequentially assembled.

[0026] The negative pressure chamber 2 and the storage chamber 3 are connected by a vent valve 202 with bidirectional flow control function. The vent valve 202 can be opened when needed, so that the gas collected in the storage chamber 3 can smoothly enter the negative pressure chamber 2 under negative pressure conditions. After sampling is completed, the vent valve 202 is closed, so that the negative pressure chamber 2 can be used to carry and sample the gas, ensuring the airtight pressure retention effect of the negative pressure chamber 2.

[0027] To facilitate the entry of the gas and solid mixture, a feed hole 303 is provided through the side wall of the storage silo 3 for material introduction. There are multiple feed holes 303, which are distributed circumferentially around the axis of the storage silo 3 to ensure that the material can enter the storage silo 3 efficiently during the sampling process. Preferably, a gas filter cotton is provided inside the storage silo 3 to filter the solid particles in the gas, which can ensure the sampling effect.

[0028] The front end of the working head 4 is equipped with a traveling component 6, which is used to assist the device in moving and drilling in the underground borehole of the coal mine. The traveling component 6 can travel along the extension direction of the hole, providing stable moving power and drilling support for the device, ensuring that the device can reach the designated sampling position.

[0029] A sealing sleeve 8 is provided on the outside of the storage bin 3 via a sliding connection to seal or open the feed hole 303. The sealing sleeve 8 can slide back and forth along the outer wall of the storage bin 3. When it slides to correspond with the feed hole 303, it can seal and cover the feed hole 303. When it slides away from the feed hole 303, the feed hole 303 is opened, thereby enabling the feed hole 303 to be open for feeding. Inside the working head 4, there is an electric telescopic rod 7 to assist the sealing sleeve 8 in sliding back and forth. The telescopic end of the electric telescopic rod 7 is connected to the sealing sleeve 8. By extending and retracting the electric telescopic rod 7, the sealing sleeve 8 can be precisely driven to slide along a preset trajectory, thereby assisting in the opening and closing of the feed hole 303 and realizing the automated control of the sampling process.

[0030] In the actual operation of the device, the power output of the traveling component 6 is first used to assist the device in completing the drilling operation in the borehole in the coal mine and to move the device to the target sampling position. Then, the extension or retraction of the electric telescopic rod 7 drives the sealing sleeve 8 to move away from the feed hole 303, thereby opening the feed hole 303. At this time, the mixture of gas and solid particles in the borehole will enter the storage bin 3 through the feed hole 303 under its own flow characteristics. At the same time as the material enters the storage bin 3, the air guide valve 202 on the negative pressure bin 2 is opened to create a negative pressure environment by discharging some of the gas in the negative pressure bin 2. With the opening of the air guide valve 202, the gas in the storage bin 3 is filtered by the gas filter cotton under the negative pressure and then efficiently collected into the negative pressure bin 2. After the gas collection is completed, the air guide valve 202 is closed, and the electric telescopic rod 7 drives the sealing sleeve 8 to reset, sealing the feed hole 303.

[0031] Furthermore, the negative pressure chamber 2 is equipped with a pressure sensor 201. When the pressure sensor 201 reaches a certain value, the air valve 202 closes.

[0032] Throughout the process, the coordinated action of multiple components in the device ensures the sealing of the sampling process, effectively preventing gas leakage, while achieving effective collection of gas. A corresponding microcontroller, battery, and position sensor can be installed inside the device. The gas guide valve 202, battery, sensor, pressure sensor 201, travel component 6, and electric telescopic rod 7 in the device are all electrically connected to the microcontroller. The microcontroller is directly electrically connected to external control equipment or electrically connected to the outside via a wireless communication module. The pressure sensor 201 is located inside the negative pressure chamber 2 and can monitor the pressure changes in the negative pressure chamber 2 in real time, converting the pressure data into an electrical signal and transmitting it to the microcontroller.

[0033] During gas sampling, as gas accumulates in the negative pressure chamber 2, when the pressure value detected by the pressure sensor 201 reaches a preset threshold, the pressure sensor 201 immediately sends a trigger signal to the microcontroller. Upon receiving the signal, the microcontroller automatically sends a closing command to the guide valve 202. After receiving the command, the guide valve 202 quickly cuts off the passage between the negative pressure chamber 2 and the storage silo 3, stopping the gas from continuing to enter the negative pressure chamber 2. This achieves automatic pressure maintenance in the negative pressure chamber 2, avoiding the risk of gas leakage or overpressure caused by delays in manual operation, and improving the accuracy and safety of the sampling process.

[0034] Specifically, in the above structure, the air pressure sensor 201 can be a relevant model from the GEDruckDPI800 series; the electrically controlled air valve 202 can be a pilot-operated solenoid valve; the electric telescopic rod 7 has a stroke of 40mm-120mm and an IP65 protection rating, providing excellent waterproof and dustproof performance, effectively preventing dust and the electric telescopic rod from entering the motor; the microcontroller can be an industrial-grade high-performance microcontroller, such as certain models from the STM32 series; the wireless communication module uses a LoRa-based wireless communication module, and its operating frequency band can be selected in a frequency band suitable for the underground coal mine environment. This frequency band has strong penetration and anti-interference capabilities, enabling stable data transmission in the complex underground space environment; the position sensor is an inductive proximity switch type position sensor.

[0035] This underground directional drilling coal seam sealed pressure gas sampling device can significantly reduce the need for manual operation in traditional sampling processes through more automated component control and collaborative operation, thereby reducing the safety risks of manual operation in high-risk underground environments. At the same time, the negative pressure collection design of the negative pressure chamber 2 and the close cooperation of various sealing components improve the efficiency and collection effect of gas sampling, ensuring that the obtained gas samples are accurate and representative, providing reliable data support for gas detection and safety assessment in coal mine operations, and thus effectively improving the overall efficiency and safety of the underground gas sampling process in coal mines.

[0036] The second embodiment differs from the first embodiment in that:

[0037] To enhance the structural stability of the negative pressure chamber 2 and the storage chamber 3 after connection, a support ring 203 is provided between them. The support ring 203 supports the negative pressure chamber 2 and the storage chamber 3 by fitting against the surfaces between them. The support ring 203 forms a cylindrical cavity, and the air valve 202 is installed in this cylindrical cavity. The pipe between the air valve 202 and the storage chamber 3 is a flexible hose, which can play a buffering and protective role, avoid stress concentration at the connection point, and ensure the reliability of the overall structure of the device in the downhole working environment.

[0038] The storage bin 3 includes a storage cup 301. One end of the storage cup 301 is connected to the movable end of the gas valve 202. It can be connected to or isolated from the negative pressure chamber 2 depending on the opening and closing state of the gas valve 202. The end of the storage cup 301 away from the gas valve 202 is an open structure. Gas filter cotton is placed in the storage cup 301. The gas filter cotton is used to filter the mixture of gas and solid particles entering the storage cup 301, blocking solid impurities from entering the subsequent negative pressure chamber 2, ensuring the quality of the collected gas sample, and at the same time avoiding impurities from clogging the gas valve 202 and affecting the normal operation of the device.

[0039] At the opening of the storage cup 301, a protective frame 302 is installed in a hinged manner. Preferably, the length of the protective frame 302 is greater than the length of the storage cup 301, which can completely cover the opening of the storage cup 301 and part of the side wall, thus protecting the storage cup 301. After the protective frame 302 is rotated, the storage cup 301 and the protective frame 302 can be fully opened, which facilitates the sorting of materials inside the storage bin 3 and the removal of the gas filter cotton inside the storage cup 301. By opening the air guide valve 202, the gas inside the negative pressure chamber 2 can be easily discharged and detected. In addition, in the device, the feed hole 303 is opened through the side wall of the protective frame 302. The gas and solid mixture must first pass through the feed hole 303 on the protective frame 302 before entering the storage cup 301.

[0040] In addition, a movable sliding sleeve 102 is provided on the outer wall of the storage cup 301. The sliding sleeve 102 can slide along the outer wall of the storage cup 301. When it slides to the position where it fits against the outer wall of the guard frame 302, it provides a fixing effect by pressing against the outer wall of the guard frame 302, thus helping to fix the guard frame 302 and preventing it from loosening or shifting due to vibration during device movement or operation. This ensures the connection between the storage cup 301 and the guard frame 302. A guide sleeve 101 is fitted on the outer side of the guide belt 1. One end of the guide sleeve 101 is connected and fixed to the outer wall of the negative pressure chamber 2, forming a transition support structure from the guide belt 1 to the negative pressure chamber 2. This not only limits and guides the guide belt 1 but also enhances the stability of the connection between the negative pressure chamber 2 and the guide belt 1. The sliding sleeve 102 slides on the outside of the guide sleeve 101. The sliding sleeve 102 and the guide sleeve 101 are connected by bolts. The position of the sliding sleeve 102 on the guide sleeve 101 can be adjusted by loosening or tightening the bolts. Once the position is determined, tightening the bolts will fix it. The movable end of the sliding sleeve 102 away from the guide sleeve 101 extends to the guard frame 302 and maintains a sliding fit with the outer wall of the guard frame 302. This can further provide lateral support to the guard frame 302 and limit the rotation of the guard frame 302. When it is necessary to open the guard frame 302, the bolts fixing the sliding sleeve 102 are released, and the sliding sleeve 102 slides. When the sliding sleeve 102 and the guard frame 302 are staggered, the guard frame 302 can be rotated to open the storage cup 301.

[0041] The third embodiment differs from the first embodiment in that:

[0042] A connecting frame 5 is fixedly installed on the inner wall of the working head 4. The connecting frame 5 mainly serves to support and install the components. The connecting frame 5 is made of high-strength material to adapt to the complex working environment and stress requirements in the coal mine. The traveling component 6, which undertakes the drilling and traveling function of the device, and the electric telescopic rod 7, which controls the sliding of the sealing sleeve 8, are both fixedly installed to the connecting frame 5 by bolts or welding. The connecting frame 5 provides a stable installation foundation for both, ensuring that the traveling component 6 will not be displaced or shaken during drilling operations and the electric telescopic rod 7 will not be moved during telescopic movements, thus ensuring the operating accuracy of the components.

[0043] The connecting frame 5 is connected to the sealed end of the guard frame 302 through a rod-like structure. This rod-like structure serves to connect and fix, provide auxiliary support, and also support the guard frame 302.

[0044] The traveling assembly 6 includes a motor 601 that provides power output. The motor 601 is mounted on the connecting frame 5, and its output end extends away from the guard frame 302. The output end of the motor 601 is connected to a rotating frame 602, which is rotatably mounted on the outside of the working head 4. Its structure is adapted to the outer wall of the working head 4. Spiral blades 603 are fixedly mounted on the outer circumferential surface of the rotating frame 602. Multiple crushing cutter heads 604 for crushing coal seams are evenly arranged on the front surface of the rotating frame 602. The motor 601 drives the rotating frame 602 to rotate, utilizing the rotating crushing cutter heads... The 604 can crush the obstructing material in front of the hole and use the friction and cutting action of the spiral blade 603 with the coal seam to propel the device forward along the drilling direction, thus realizing the device's movement function. In addition, the crushing head 604 is made of wear-resistant and high-strength alloy material. When the rotating frame 602 rotates, the crushing head 604 can crush the coal seam in front first, reducing the movement resistance of the spiral blade 603 and assisting the device to open holes in the coal seam more efficiently. It is especially suitable for coal seam environments with high hardness, improving the drilling efficiency and adaptability of the device.

[0045] The sealing sleeve 8 includes a sealing ring 801 that slides on the outside of the guard 302. The sealing ring 801 is positioned corresponding to the feed hole 303 on the side wall of the guard 302, and its inner diameter is adapted to the outer diameter of the guard 302 to ensure a tight fit against the outer wall of the guard 302 during sliding. When the sealing ring 801 slides to the position covering the feed hole 303, it can seal the feed hole 303 to prevent gas leakage or the entry of external impurities. When the sealing ring 801 slides to the position away from the feed hole 303, the feed hole 303 is sealed. The opening ensures the smooth entry of the gas and solid mixture into the storage silo 3. On the side of the sealing ring 801 facing the working head 4, an integrally formed or fixedly connected insert sleeve 802 is provided. The outer diameter of the insert sleeve 802 matches the inner wall size of the working head 4, allowing it to slide along the inner wall. This structure provides guidance for the sliding of the sealing ring 801, ensuring that the sealing ring 801 always moves along the axis of the guard 302, preventing displacement that could lead to sealing failure. It also enhances the sealing performance between the sealing ring 801 and the working head 4. Simultaneously, the electric telescopic rod 7 is fixed to the connecting frame 5. The telescopic end of the electric telescopic rod 7 is fixedly connected to the sealing ring 801. When the electric telescopic rod 7 is working, it can directly drive the sealing ring 801 to slide along the guard 302 and the inner wall of the working head 4, precisely controlling the opening and closing of the feed hole 303.

[0046] To optimize the movement stability and guiding accuracy of the sliding components, a limiting groove is provided on the outer wall of the storage bin 3 along its axial direction. The length of the groove is adapted to the movement stroke of the sliding component, ensuring that the component does not exceed the preset range when sliding. Correspondingly, the inner wall of the previously mentioned sliding sleeve 102 and the side of the sealing ring 801 that contacts the outer wall of the storage bin 3 are provided with protrusions that match the grooves on the outer wall of the storage bin 3. When the sliding sleeve 102 slides along the outer wall of the storage bin 3, or when the sealing ring 801 drives the sealing sleeve 8 to move as a whole, the protrusions can be embedded in the groove and slide along the groove, ensuring the accuracy of the component position, reducing frictional loss during the sliding process, extending the service life of the component, and ensuring that the device maintains stable sliding performance during downhole operations.

[0047] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A coal seam sealed pressure-maintaining gas sampling device for directional drilling in coal mines, comprising a conveyor belt (1), characterized in that: The front end of the conveyor belt (1) is sequentially provided with a negative pressure chamber (2), a storage chamber (3), and a working head (4); The negative pressure chamber (2) and the storage chamber (3) are connected by an air guide valve (202); the storage chamber (3) has a feed hole (303) through its side wall, and the storage chamber (3) is equipped with gas filter cotton inside; The working head (4) is provided with a traveling component (6) at the front end. A sealing sleeve (8) for sealing the feed hole (303) is slidably installed on the outside of the storage bin (3). An electric telescopic rod (7) is provided inside the working head (4) to assist the sealing sleeve (8) in sliding back and forth. The sealing sleeve (8) is slidably driven to assist the opening and closing of the feed hole (303).

2. The coal seam sealed pressure-maintaining gas sampling device for directional drilling in coal mines according to claim 1, characterized in that: A support ring (203) is provided between the negative pressure chamber (2) and the storage chamber (3) to support the negative pressure chamber (2) and the storage chamber (3) respectively.

3. The coal seam sealed pressure-maintaining gas sampling device for directional drilling in coal mines according to claim 2, characterized in that: The storage bin (3) includes a storage cup (301) connected to the movable end of the air valve (202). The storage cup (301) is provided with gas filter cotton. A guard (302) is hinged at the opening of the storage cup (301). The length of the guard (302) is greater than the length of the storage cup (301). The feed hole (303) passes through the side wall of the guard (302). The outer wall of the storage cup (301) is provided with a movable sliding sleeve (102) to assist in fixing the guard (302). The guard (302) is fixed by pressing against the outer wall of the guard (302).

4. The coal seam sealed pressure-maintaining gas sampling device for directional drilling in coal mines according to claim 3, characterized in that: The guide belt (1) is provided with a guide sleeve (101), the guide sleeve (101) is connected and fixed to the negative pressure chamber (2), the inner end of the sliding sleeve (102) is slidably engaged with the guide sleeve (101), the sliding sleeve (102) is connected to the guide sleeve (101) by bolts, the movable end of the sliding sleeve (102) extends to the guard frame (302) and is slidably engaged with the outer wall of the guard frame (302).

5. The coal seam sealed pressure-maintaining gas sampling device for directional drilling in coal mines according to claim 4, characterized in that: The support ring (203) is slidably engaged with the sliding sleeve (102), and the air valve (202) is located in the middle of the support ring (203).

6. The coal seam sealed pressure-maintaining gas sampling device for directional drilling in coal mines according to claim 4, characterized in that: The inner wall of the working head (4) is provided with a connecting frame (5). The traveling component (6) and the electric telescopic rod (7) are both fixedly installed with the connecting frame (5). The connecting frame (5) is connected to the sealed end of the guard frame (302) through a rod-shaped structure.

7. A coal seam sealed pressure-maintaining gas sampling device for directional drilling in coal mines according to claim 6, characterized in that: The traveling component (6) includes a motor (601), the output end of which is connected to a rotating frame (602). The rotating frame (602) is rotatably disposed on the outside of the working head (4). The rotating frame (602) includes a spiral blade (603) located on the outer circular surface of the motor (601). The rotating frame (602) has a plurality of crushing cutter heads (604) on its front surface to assist the device in making holes and traveling in the coal seam.

8. A coal seam sealed pressure-maintaining gas sampling device for directional drilling in coal mines according to claim 7, characterized in that: The sealing sleeve (8) includes a sealing ring (801) that slides on the outside of the guard (302), and the sealing ring (801) is correspondingly provided with the feed hole (303); The sealing ring (801) has a plug sleeve (802) on the side facing the working head (4). The plug sleeve (802) slides with the inner wall of the working head (4). The telescopic end of the electric telescopic rod (7) is connected to the sealing ring (801).

9. A coal seam sealed pressure-maintaining gas sampling device for directional drilling in coal mines according to claim 8, characterized in that: The outer wall of the storage bin (3) is provided with a sliding groove extending along its axis, and both the sliding sleeve (102) and the sealing ring (801) are provided with protrusions that slide corresponding to the outer wall of the storage bin (3).

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