Spraying hole locking type blowout preventer for coal mine gas control

Abstract

The invention discloses a spraying hole locking type blowout preventer for coal mine gas control, which comprises an extraction pipe main body, the outer wall of the extraction pipe is sleeved with an outer sleeve, and the outer sleeve is in sliding connection with the extraction pipe main body; the expansion supporting mechanism comprises four sets of positioning plates, the positioning plates are parallel to the axis of the outer sleeve, the end of the outer sleeve is fixedly connected with a mounting plate, one end of each positioning plate is slidably connected to the side, away from the outer sleeve, of the mounting plate, and the end of the extraction pipe body penetrates through the mounting plate and is rotationally connected with a plurality of mounting rings; a plurality of expanding assemblies are arranged between the mounting ring and the positioning plate in the circumferential direction at equal intervals. The clamping assembly is mounted at the other end of the extraction pipe main body; the transmission assembly is fixed on the outer sleeve; a blocking air bag is installed on the outer wall of the outer sleeve. The problems that a traditional device is not firm in sealing and prone to failure are solved, and a stable safety barrier is built for gas extraction operation.

Description

Technical Field

[0001] This invention relates to the field of safety equipment for coal mine gas extraction, and in particular to a blowout prevention device with a closed nozzle for coal mine gas control. Background Technology

[0002] In coal mining, gas control is a core component of ensuring safe production. Gas drainage, as a key technology for reducing coal seam gas content and eliminating the risk of gas outbursts, is widely used in high-gas and outburst-prone mines. However, during gas drainage in high-gas, high-pressure, and soft outburst-prone coal seams, the drainage boreholes are prone to blowouts due to factors such as coal seam gas pressure release and coal body structure fracturing. High-pressure gas, carrying broken coal chunks and coal dust, is ejected at high speed from the borehole, causing not only blockage of the drainage pipe and imbalance of the negative pressure in the drainage system, leading to a significant decrease in gas drainage efficiency, but also potential gas leakage and accumulation, creating major safety hazards such as explosions and poisoning, seriously threatening the lives of underground workers and the normal production order of the mine. To address blowout problems, various blowout preventer devices have emerged in existing technologies, primarily achieving blowout prevention through sealing structures and gate valve-type locking mechanisms at the ends of the extraction pipe. However, existing blowout preventers generally suffer from the following drawbacks: First, insufficient sealing stability. Most devices rely on a single mechanical clamping or airbag sealing structure, which is difficult to adapt to the irregular borehole walls and soft, easily collapsing coal seams, leading to sealing failure and gas leakage. Second, poor adjustment flexibility of the expansion and dilation support mechanism. Existing devices often have expansion and dilation components designed with a fixed angle, unable to adaptively adjust the support range according to the borehole diameter, limiting their applicability. Third, inconvenient installation and positioning. The connection structure between the device and the extraction pipe is complex and lacks an effective axial positioning mechanism, making it prone to displacement under the impact of high-pressure blowouts, affecting the blowout prevention effect. Fourth, insufficient reliability of the transmission mechanism. The transmission components used to drive the expansion and dilation and sealing actions in existing devices often use gear transmission or simple sliding fits, which are prone to jamming and wear in the harsh, humid, and dusty environment underground, causing the device to malfunction. With the increasing depth of coal mining, the proportion of high-gas and outburst-prone coal seams being mined is gradually increasing, leading to a greater frequency and severity of blowout accidents. Existing blowout preventers are no longer sufficient to meet the high-efficiency and safe requirements of coal mine gas control. Therefore, developing a blowout-locking blowout preventer with features such as self-adaptive expansion support, stable sealing, convenient installation, and reliable transmission has become an urgent technical problem to be solved in the field of coal mine gas drainage safety equipment. Summary of the Invention

[0003] The purpose of this invention is to provide a blowout prevention device with a closed nozzle for coal mine gas control, so as to solve the problems existing in the prior art.

[0004] To achieve the above objectives, the present invention provides the following solution: The present invention provides a blowout prevention device with nozzle locking for coal mine gas control, comprising: The extraction pipe body has an outer sleeve fitted on its outer wall, and the outer sleeve is slidably connected to the extraction pipe body. An expansion support mechanism includes a positioning plate, which is arranged parallel to the axis of the outer sleeve. Four sets of positioning plates are provided. An installation plate is fixedly connected to the end of the outer sleeve. One end of the positioning plate is slidably connected to the side of the installation plate away from the outer sleeve. The end of the extraction tube body passes through the installation plate and is rotatably connected to several installation rings. Several expansion components are arranged circumferentially at equal intervals between the installation rings and the positioning plate. A clamping assembly is installed at the other end of the extraction tube body and is used to position the extraction tube body. A transmission assembly, which is fixed to the outer sleeve and is threadedly engaged with the extraction tube body; The outer wall of the outer sleeve is equipped with a sealing airbag.

[0005] According to the coal mine gas control nozzle locking type blowout preventer provided by the present invention, four sets of sliding grooves are equally spaced on the outer wall of the mounting plate. The axis of the sliding grooves coincides with the radius line of the mounting plate. A connecting plate is slidably connected in the sliding groove. A directional wheel is rotatably connected to the upper part of the connecting plate. The directional wheel is slidably engaged with the mounting plate. The mounting plate is fixedly connected to the end of the connecting plate.

[0006] According to the present invention, the blowout prevention device for coal mine gas control with nozzle locking mechanism includes a first trapezoidal block and a second trapezoidal block. The first trapezoidal block is fixedly connected to the outer wall of the mounting ring, and the second trapezoidal block is fixedly connected to the inner wall of the mounting plate. The inclined surfaces of the first trapezoidal block and the second trapezoidal block are correspondingly arranged. A retaining plate is fixedly connected to the inclined surface of the first trapezoidal block, and a retaining groove is formed on the inclined surface of the second trapezoidal block. The retaining plate is adapted to the retaining groove and is slidably connected in the retaining groove.

[0007] According to the present invention, the transmission assembly of the coal mine gas control nozzle locking type blowout preventer includes a fixed gear, a drive gear and an electric slip ring. The fixed gear is fixed to the end of the outer sleeve, the drive gear is threaded to the outside of the extraction pipe body, the electric slip ring is installed between the fixed gear and the drive gear, and the stator of the electric slip ring is fixed to the fixed gear, and the rotor of the electric slip ring is fixed to the drive gear.

[0008] According to the coal mine gas control nozzle locking type blowout prevention device provided by the present invention, the clamping assembly includes a support seat installed at the end of the extraction pipe body, and the support seat is slidably connected to the extraction pipe body.

[0009] According to the coal mine gas control nozzle locking type blowout preventer provided by the present invention, a positioning block is fixedly connected to the inner wall of the outer sleeve, and a positioning groove is opened along the axial direction on the inner wall of the extraction pipe body, and the positioning block is slidably connected in the positioning groove.

[0010] According to the blowout prevention device for coal mine gas control provided by the present invention, a pressure sensor is installed inside the sealing airbag, and the pressure sensor is connected to the control system through a transmission module.

[0011] According to the present invention, the nozzle locking type blowout prevention device for coal mine gas control has an anti-slip groove provided on the outer wall of the positioning plate.

[0012] The present invention discloses the following technical effects: The device adopts a linkage design of sealing airbag and expansion support mechanism. When the eruption occurs, the gas pressure will drive the airbag to compact and seal, and the expansion component will further tighten, forming a double locking effect, which greatly improves the sealing reliability and can effectively block high-pressure gas leakage. It solves the problems of poor sealing and easy failure of traditional devices, and builds a solid safety barrier for gas extraction operations. The extraction pipe body and the outer sleeve are slidably connected. With the threaded transmission structure of the transmission component, the outer sleeve can be moved and the expansion support mechanism can be positioned by simply driving the transmission component. The clamping component can quickly fix the whole device. No complicated tools or cumbersome procedures are required throughout the process, which significantly reduces the intensity of on-site operations, improves the efficiency of device installation and commissioning, and is suitable for the complex working environment of underground coal mines. Four sets of positioning plates are arranged at equal intervals around the circumference, combined with the uniform support of multiple sets of expansion components, to ensure that the device is subjected to balanced forces within the borehole, and its positioning is stable and not prone to displacement. The sealing airbag has good pressure self-adaptability, and can adapt to different borehole diameters and borehole wall conditions. The various components of the device work together to maintain a stable working state even under gas pressure fluctuations and borehole impacts, effectively reducing operational safety risks and extending the service life of the device. Attached Figure Description

[0013] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0014] Figure 1This is an isometric view of the blowout prevention device with nozzle locking for coal mine gas control according to the present invention. Figure 2 This is a front view of the blowout prevention device with nozzle locking for coal mine gas control according to the present invention.

[0015] The components include: 1. main body of the extraction pipe; 2. outer casing; 3. mounting plate; 4. mounting ring; 5. sealing airbag; 6. connecting plate; 7. directional wheel; 8. first trapezoidal block; 9. second trapezoidal block; 10. clamping plate; 11. fixed gear; 12. drive gear; 13. support base; and 14. positioning plate. Detailed Implementation

[0016] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0017] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0018] Reference Figures 1-2 This invention provides a blowout prevention device with nozzle locking mechanism for coal mine gas control, comprising: The extraction pipe body has an outer sleeve fitted on its outer wall, and the outer sleeve is slidably connected to the extraction pipe body. The expansion support mechanism includes a positioning plate 14, which is arranged parallel to the axis of the outer tube. There are four sets of positioning plates 14. The end of the outer tube is fixedly connected to an installation plate. One end of the positioning plate 14 is slidably connected to the side of the installation plate away from the outer tube. The end of the extraction tube body passes through the installation plate and is rotatably connected to several installation rings. Several expansion components are arranged circumferentially at equal intervals between the installation rings and the positioning plate 14. Clamping assembly, which is installed at the other end of the extraction tube body, is used to position the extraction tube body. The transmission assembly is fixed on the outer sleeve, and the transmission assembly and the extraction pipe body are threaded together. The outer wall of the outer tube is equipped with a sealing airbag.

[0019] In operation, the extraction pipe body is first precisely positioned at a predetermined location in the coal mine gas extraction borehole using the clamping assembly, ensuring the overall installation of the device is stable and aligned with the borehole axis. Then, the transmission assembly is activated. Since the transmission assembly is threadedly engaged with the extraction pipe body, and the outer sleeve is slidably connected to the extraction pipe body, the transmission assembly drives the outer sleeve to move along the axis of the extraction pipe body into the borehole. During the movement of the outer sleeve, the mounting plate at its end simultaneously pushes the expansion support mechanism. The expansion assembly between the mounting ring and the positioning plate 14 gradually expands under the thrust, and the four sets of positioning plates 14, parallel to the axis of the outer sleeve, expand towards the inner wall of the borehole until they tightly abut against the inner wall, achieving reliable support and centered positioning of the device within the borehole. After the expansion support mechanism completes positioning, the sealing airbag on the outer wall of the outer sleeve is inflated. The inflated sealing airbag tightly fits the gap between the inner wall of the borehole and the outer wall of the outer sleeve, forming the first sealing barrier. When abnormal gas pressure inside the borehole causes a blowout, the high-pressure gas acts on the sealing airbag to further compact and seal it. At the same time, the expansion support mechanism is strengthened by the reaction force of the gas pressure, realizing the blowout locking function, effectively preventing gas leakage, and ensuring the safe and orderly progress of the extraction operation.

[0020] The design was further optimized by creating four sets of equally spaced sliding grooves on the outer circumference of the mounting plate. The axis of the sliding grooves coincides with the radius of the mounting plate. A connecting plate is slidably connected inside the sliding groove, and a directional wheel is rotatably connected to the upper part of the connecting plate. The directional wheel slides with the mounting plate, and the mounting plate is fixedly connected to the end of the connecting plate.

[0021] Four sets of equally spaced grooves (with their axes coinciding with the radius of the mounting plate) are circumferentially spaced on the outer wall of the mounting plate, providing directional sliding tracks for the connecting plate. When the outer sleeve moves the mounting plate, the connecting plate slides along the grooves toward the inner wall of the borehole, simultaneously causing the positioning plate 14 at the end to expand. The directional wheel, which is rotatably connected to the connecting plate, slides in cooperation with the mounting plate, converting the sliding friction between the connecting plate and the grooves into rolling friction, reducing frictional resistance, making the expansion process of the positioning plate 14 smoother and more stable, avoiding jamming of the connecting plate due to excessive friction, and ensuring that the four sets of positioning plates 14 simultaneously press against the inner wall of the borehole, thus improving support stability.

[0022] The scheme is further optimized. The expansion component includes a first trapezoidal block and a second trapezoidal block. The first trapezoidal block is fixedly connected to the outer wall of the mounting ring, and the second trapezoidal block is fixedly connected to the inner wall of the mounting plate. The inclined surfaces of the first trapezoidal block and the second trapezoidal block are correspondingly arranged. A retaining plate is fixedly connected to the inclined surface of the first trapezoidal block, and a retaining groove is opened on the inclined surface of the second trapezoidal block. The retaining plate is adapted to the retaining groove, and the retaining plate is slidably connected in the retaining groove.

[0023] In the expansion assembly, the first trapezoidal block is fixed to the outer wall of the mounting ring, and the second trapezoidal block is fixed to the inner wall of the positioning plate 14, with their inclined surfaces corresponding and fitting together. When the outer sleeve pushes the mounting plate to move, the mounting ring and the positioning plate 14 are relatively displaced, and the inclined surfaces of the first and second trapezoidal blocks press against each other. The guiding effect of the trapezoidal inclined surfaces drives the positioning plate 14 to expand towards the inner wall of the borehole. At the same time, the retaining plate on the inclined surface of the first trapezoidal block is embedded in the retaining groove of the inclined surface of the second trapezoidal block and slides. On the one hand, the cooperation between the retaining plate and the retaining groove restricts the relative offset of the first and second trapezoidal blocks and prevents the inclined surfaces from disengaging. On the other hand, it forms an "interlocking" transmission to ensure stable transmission of tension force, prevent the expansion assembly from loosening due to gas pressure impact, and strengthen the locking effect of the expansion support mechanism.

[0024] The scheme is further optimized. The transmission component includes a fixed gear, a drive gear, and an electric slip ring. The fixed gear is fixed to the end of the outer sleeve, the drive gear is threaded to the outside of the extraction tube body, and the electric slip ring is installed between the fixed gear and the drive gear. The stator of the electric slip ring is fixed to the fixed gear, and the rotor of the electric slip ring is fixed to the drive gear.

[0025] The fixed gear is fixed to the end of the outer sleeve, and the drive gear is threadedly connected to the main body of the extraction tube. The two are driven by gear meshing. When the drive gear rotates, it moves along the axis of the extraction tube due to its thread engagement with the main body of the extraction tube. At the same time, the fixed gear and the outer sleeve move synchronously through gear meshing. An electric slip ring is installed between the fixed gear and the drive gear. The stator is fixed to the fixed gear, and the rotor is fixed to the drive gear. This allows for stable transmission of electrical energy and signals (such as powering subsequent sensors and airbag inflation devices) when the two rotate relative to each other. It also prevents the wiring from becoming tangled or broken due to gear rotation, ensuring the normal operation of the electrical system during transmission.

[0026] The design is further optimized so that the clamping assembly includes a support seat installed at the end of the extraction pipe body, and the support seat is slidably connected to the extraction pipe body.

[0027] The support base is installed at the end of the extraction pipe body and is slidably connected to the extraction pipe, allowing its position to be adjusted along the axis of the extraction pipe. During the installation phase, the support base is slidable to a position that aligns with the external reference surface of the borehole (such as the roadway wall or fixed bracket). The initial positioning of the extraction pipe body is achieved by fixing the support base to the external structure (such as bolt tightening or clamp clamping). The sliding connection design allows the support base to adapt to different borehole depths and external installation environments, and the position of the support point can be flexibly adjusted to ensure that the extraction pipe body always maintains axial stability and avoids device offset due to installation reference deviation.

[0028] The design is further optimized by fixing a positioning block to the inner wall of the outer sleeve, and providing a positioning groove along the axial direction on the inner wall of the extraction tube body, with the positioning block slidably connected in the positioning groove.

[0029] The positioning block on the inner wall of the outer sleeve is embedded in the axial positioning groove on the inner wall of the extraction pipe body, and the two are in sliding engagement. When the transmission component drives the outer sleeve to move along the extraction pipe, the positioning block slides directionally along the positioning groove, restricting the relative rotation between the outer sleeve and the extraction pipe. This ensures that the outer sleeve only translates along the axis of the extraction pipe, avoiding displacement of the expansion support mechanism and the sealing airbag due to the rotation of the outer sleeve. This ensures synchronous operation of the expansion component and accurate sealing of the airbag, while also preventing the threaded transmission component from failing due to relative rotational misalignment.

[0030] The design was further optimized by installing a pressure sensor inside the airbag, which is connected to the control system via a transmission module.

[0031] The anti-slip grooves on the outer wall of the positioning plate 14 increase the contact friction between the positioning plate 14 and the inner wall of the borehole. When the expansion support mechanism drives the positioning plate 14 to press against the inner wall of the borehole, the anti-slip grooves embed into the coal and rock gaps in the inner wall of the borehole, forming an interlocking structure. This prevents the positioning plate 14 from sliding or shifting due to gas pressure impact or the smoothness of the inner wall of the borehole, strengthens the support stability of the positioning plate 14, ensures that the device maintains stable positioning under high pressure, and avoids the sealing failure of the sealing airbag due to loose support.

[0032] To further optimize the design, anti-slip grooves are provided on the outer wall of the positioning plate 14.

[0033] A faulty pressure sensor inside the airbag can cause monitoring failure. It is recommended to install two pressure sensors symmetrically inside the airbag and use a "dual sensor data comparison" mechanism. If the data difference between the two exceeds 5%, a sensor fault alarm will be triggered. At the same time, a stainless steel protective shell should be added to the sensor to prevent the airbag from inflating and compressing the sensor.

[0034] In the description of this invention, it should be understood that the terms "longitudinal", "lateral", "up", "down", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this invention, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this invention.

[0035] The embodiments described above are merely preferred embodiments of the present invention and are not intended to limit the scope of the present invention. Various modifications and improvements made by those skilled in the art to the technical solutions of the present invention without departing from the spirit of the present invention should fall within the protection scope defined by the claims of the present invention.

Claims

1. A blowout prevention device with a closed nozzle for coal mine gas control, characterized in that, include: The extraction pipe body has an outer sleeve fitted on its outer wall, and the outer sleeve is slidably connected to the extraction pipe body. The expansion support mechanism includes a positioning plate (14), which is arranged parallel to the axis of the outer tube. There are four sets of positioning plates (14). An installation plate is fixedly connected to the end of the outer tube. One end of the positioning plate (14) is slidably connected to the side of the installation plate away from the outer tube. The end of the extraction tube body passes through the installation plate and is rotatably connected to several installation rings. Several expansion components are arranged circumferentially at equal intervals between the installation rings and the positioning plate (14). A clamping assembly is installed at the other end of the extraction tube body and is used to position the extraction tube body. A transmission assembly, which is fixed to the outer sleeve and is threadedly engaged with the extraction tube body; The outer wall of the outer sleeve is equipped with a sealing airbag.

2. The blowout prevention device with nozzle locking for coal mine gas control according to claim 1, characterized in that, The mounting plate has four sets of equally spaced sliding grooves on its outer circumference. The axis of the sliding grooves coincides with the radius of the mounting plate. A connecting plate is slidably connected in the sliding groove. A directional wheel is rotatably connected to the upper part of the connecting plate. The directional wheel is slidably engaged with the mounting plate. The mounting plate is fixedly connected to the end of the connecting plate.

3. The blowout prevention device with nozzle locking for coal mine gas control according to claim 1, characterized in that, The expansion assembly includes a first trapezoidal block and a second trapezoidal block. The first trapezoidal block is fixedly connected to the outer wall of the mounting ring, and the second trapezoidal block is fixedly connected to the inner wall of the mounting plate. The inclined surfaces of the first trapezoidal block and the second trapezoidal block are respectively arranged. A retaining plate is fixedly connected to the inclined surface of the first trapezoidal block, and a retaining groove is formed on the inclined surface of the second trapezoidal block. The retaining plate is adapted to the retaining groove and is slidably connected in the retaining groove.

4. The blowout prevention device with nozzle locking for coal mine gas control according to claim 1, characterized in that, The transmission assembly includes a fixed gear, a drive gear, and an electric slip ring. The fixed gear is fixed to the end of the outer sleeve, the drive gear is threaded to the outside of the extraction tube body, the electric slip ring is installed between the fixed gear and the drive gear, and the stator of the electric slip ring is fixed to the fixed gear, while the rotor of the electric slip ring is fixed to the drive gear.

5. The blowout prevention device with nozzle locking for coal mine gas control according to claim 1, characterized in that, The clamping assembly includes a support seat installed at the end of the extraction tube body, and the support seat is slidably connected to the extraction tube body.

6. The blowout prevention device with nozzle locking for coal mine gas control according to claim 1, characterized in that, A positioning block is fixedly connected to the inner wall of the outer sleeve, and a positioning groove is opened along the axial direction on the inner wall of the extraction tube body, and the positioning block is slidably connected in the positioning groove.

7. The blowout prevention device with nozzle locking for coal mine gas control according to claim 1, characterized in that, A pressure sensor is installed inside the occlusion airbag, and the pressure sensor is connected to the control system via a transmission module.

8. The blowout prevention device with nozzle locking for coal mine gas control according to claim 1, characterized in that, The outer wall of the positioning plate (14) is provided with anti-slip grooves.

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