A drilling plugging device

Abstract

The present invention belongs to the technical field of drilling safety plugging devices, and specifically relates to a drilling plugging device, which is designed for the existing problems of plugging the gap between the working pipe and the drilling hole in the coal mine gas drainage drilling hole. The existing grouting pipe is outside the working pipe, and there are defects such as poor sealing and non-recyclable components. The drilling plugging device of the present invention includes a working pipe, a bladder, a grouting pipe and a locking and closing component. The grouting pipe is placed inside the working pipe, and the locking and closing component can control the action of the grouting pipe according to the grouting situation of the bladder and close the grouting hole. The grouting pipe includes a main section, an abutting section and a limiting section, and the locking and closing component is composed of a closing piece, an elastic piece and a limiting piece. The device can effectively reduce the risk of gas leakage in terms of safety, ensure the safety of personnel and the mine; in terms of cost, the components can be recycled and reused to reduce losses; environmentally, it reduces the accumulation of waste. It has application and promotion value in the field of plugging gas drainage drilling holes.

Description

Technical Field

[0001] The present invention belongs to the technical field of drilling safety plugging devices, and particularly relates to a drilling plugging device. Background Art

[0002] In the process of coal mining and gas control, drilling and draining gas is a crucial operation link. To achieve the smooth drainage of gas, it is necessary to drill a hole with a specific aperture in the coal seam or rock stratum and insert a working pipe to establish a gas discharge channel. However, there is inevitably a certain gap between the working pipe and the drilling wall. During the gas drainage process, if this gap is not properly plugged, gas is extremely likely to leak from here, triggering serious safety accidents such as gas explosions and poisoning, posing a huge threat to the safety of personnel lives and mine facilities.

[0003] Some existing plugging technologies have obvious defects in practical applications. Taking the relevant patent with the patent number 2019108253256 as an example, its device mainly consists of a PE (polyethylene) sealing solid pipe, an outer bladder bag, and various grouting pipes. In the technical solution of this patent, the grouting pipes are arranged outside the working pipe (PE sealing solid pipe) (see the attached Figure 10 ). Therefore, there will be two strip-shaped gaps with sharp corners facing each other in the parallel position of the grouting pipe and the working pipe. These strip-shaped gaps are difficult to be filled and sealed, and it is easy to leak slurry during the grouting process. This not only seriously affects the plugging effect, causing material waste, but also may trigger the risk of gas leakage in the gas discharge scenario, posing a serious threat to safe production. In addition, for the grouting pipes arranged in this way, since they will solidify together with the concrete slurry after grouting, they cannot be recovered and are discarded in the drilling hole or construction site after being used once, which undoubtedly increases the project cost and also brings an unnecessary burden to the environment, running counter to the current environmental protection concept. Therefore, it is extremely urgent to develop a new type of drilling plugging device specifically for gas discharge drilling holes that can effectively solve the problems of sealing and recovery. Summary of the Invention

[0004] The purpose of the present invention is to provide a plugging device for plugging the gap between the working pipe and the drilling hole during the process of drilling and draining gas, so as to ensure the safe and efficient progress of the gas drainage operation, and at the same time take into account environmental protection and resource recycling.

[0005] To achieve the above purpose, a technical solution adopted by the present invention is:

[0006] A drilling plugging device comprises a working pipe, a bladder bag, a grouting pipe and a locking and sealing assembly, wherein a grouting hole is opened on the side of the working pipe, the bladder bag is sleeved on the outside of the working pipe, and both ends are fixed to the working pipe, the grouting hole is located between the upper and lower ends of the bladder bag, the grouting pipe extends from bottom to top into the working pipe, and extends into the bladder bag through the grouting hole, and the locking and sealing assembly is arranged on the working pipe;

[0007] The locking and closing assembly is used to restrict the grouting pipe from slipping out of the grouting hole from the outside to the inside when the bag is not filled with grout;

[0008] The locking and closing assembly is also used to drive the grouting pipe from the outside to the inside out of the grouting hole under the pressure of the slurry when the bag is filled with slurry, and to close the grouting hole after the grouting pipe is out of the grouting hole.

[0009] Further, the grouting pipe comprises a main section, an abutting section and a limiting section which are sequentially connected from bottom to top, the grouting pipe extends out of the grouting hole through the abutting section and the limiting section, the outer diameter of the main section matches the inner diameter of the grouting hole, the outer diameter of the main section is greater than or equal to the outer diameter of the limiting section and is greater than the outer diameter of the abutting section;

[0010] The locking and closing assembly comprises a closing piece, an elastic piece and a limiting piece, wherein the closing piece is slidably mounted on the outside of the grouting pipe, the outer side of the lower end of the closing piece has a guiding inclined surface, the limiting piece is arranged on the outside of the working pipe and is located at the lower side of the grouting hole and the closing piece, and the elastic piece is used to drive the closing piece to slide downward;

[0011] When the lower end of the closure member abuts against the upper end of the abutment section, if the limiting section slides toward the inside of the working tube, the limiting section can abut against the guiding inclined surface;

[0012] When the thrust force applied by the limiting section to the guiding slope is insufficient to overcome the elastic force of the elastic member and drive the closing member to slide upward under the guiding action of the guiding slope, the closing member cooperates with the limiting section to limit the grouting pipe from slipping out of the grouting hole from the outside to the inside;

[0013] When the limiting section is forced to push the guiding inclined surface to drive the closing member to slide upward until the lower end is higher than the limiting section, if the limiting section continues to be forced to slide toward the inside of the working pipe, it can escape from the grouting hole from the outside to the inside;

[0014] When the limiting section escapes from the grouting hole from outside to inside, the closing member will slide downward under the elastic force of the elastic member, and when the closing member slides downward until it abuts against the limiting member, the closing member will close the grouting hole.

[0015] Furthermore, the closure member is a cylindrical structure sleeved outside the working pipe, and the closure member cannot rotate axially relative to the working pipe.

[0016] Furthermore, a limiting protrusion is provided inside the closure member, a limiting sliding groove parallel to the axial direction of the working pipe is formed outside the working pipe, and the limiting protrusion is slidably assembled in the limiting sliding groove.

[0017] Furthermore, the upper and lower ends of the elastic member are respectively connected to the closure member and the working pipe, wherein the lower end of the elastic member is located below the grouting hole.

[0018] Furthermore, there are two elastic members, and the two elastic members are symmetrically distributed on the left and right sides of the grouting hole.

[0019] Furthermore, the lower end of the elastic member is connected to the limiting member, and the upper end of the elastic member is connected to the closure member through a connecting member.

[0020] Furthermore, the limiting member and the connecting member are respectively provided with a lower annular groove and an upper annular groove, and the upper and lower ends of the elastic member are respectively assembled in the upper annular groove and the lower annular groove.

[0021] Furthermore, the elastic member is an elastic rubber band.

[0022] Furthermore, the elastic member is a tension spring.

[0023] The drilling plugging device of the present invention has many remarkable beneficial effects.

[0024] In terms of safety guarantee, it effectively solves the problem of plugging the gap between the working pipe and the drilling wall. Its unique structural design ensures the reliability of the seal, greatly reduces the risk of gas leakage, and effectively prevents the occurrence of serious safety accidents such as gas explosion and poisoning, providing a solid guarantee for the personal safety of personnel and the stable operation of mine facilities in coal mine mining and gas control operations.

[0025] In terms of cost control, it overcomes the drawback that the component pipes of the traditional device cannot be recycled, realizes the recyclability of components such as the grouting pipe, reduces the one-time loss of materials, reduces the project cost, avoids the economic pressure caused by frequent procurement of new components, and improves the economic benefits.

[0026] From the perspective of environmental protection, it reduces the accumulation of waste components in the drilling hole and at the construction site, reduces the adverse impact on the environment, conforms to the environmental protection concept of sustainable development, promotes the green development process of industries such as coal mine mining, and has important application value and positive promotion in the field of plugging gas emission drilling holes. Description of the Drawings

[0027] The accompanying drawings described herein are used to provide a further understanding of the present application, and constitute a part of the present application. The schematic embodiments of the present application and their descriptions are used to explain the present application, and do not constitute an improper limitation of the present application. In the drawings:

[0028] Figure 1 It is a schematic structural diagram of an embodiment of a drilling plugging device of the present invention;

[0029] Figure 2 It is a schematic cross-sectional structural diagram of an embodiment of a drilling plugging device of the present invention installed in a drilling hole;

[0030] Figure 3 Is Figure 2 A schematic enlarged view of the structure at A in;

[0031] Figure 4 Is Figure 3 A schematic enlarged view of the structure at B in;

[0032] Figure 5 It is a schematic structural diagram of an embodiment of a drilling plugging device of the present invention after hiding the sac;

[0033] Figure 6 Is Figure 5 A schematic enlarged view of the structure at C in;

[0034] Figure 7 It is a schematic partial structural diagram of the upper end of the grouting pipe in an embodiment of a drilling plugging device of the present invention;

[0035] Figure 8 It is a schematic partial structural diagram of the middle part of the working pipe in an embodiment of a drilling plugging device of the present invention;

[0036] Figure 9 It is a schematic structural diagram of a sealing member in an embodiment of a drilling plugging device of the present invention;

[0037] Figure 10 It is a schematic diagram of a prior art grouting pipe arranged outside a working pipe (PE sealing solid pipe).

[0038] The meanings of the reference numerals in the drawings are as follows:

[0039] Working pipe 1, grouting hole 11, limit chute 12, sac 2, grouting pipe 3, main section 31, abutting section 32, limiting section 33, locking and sealing assembly 4, sealing member 41, guiding inclined surface 411, connecting member 412, upper ring groove 4121, limiting protrusion 413, elastic member 42, elastic rubber band 421, limiting member 43, lower ring groove 431, strip-shaped gap 5. Detailed implementation manners

[0040] The present invention will be further described below with reference to the accompanying drawings.

[0041] Refer to Figures 1 - 10 As shown, a drilling plugging device of the present invention mainly consists of a working pipe 1, a bladder 2, a grouting pipe 3, and a locking and sealing assembly 4. The working pipe 1 serves as a key channel for gas drainage. Its reasonable installation and stable placement in the drilling hole are the basis for ensuring the smooth export of gas. A grouting hole 11 is provided on the side of the working pipe 1.

[0042] In this embodiment, the bladder 2 is made of a material with high strength, gas corrosion resistance, and good flexibility, and is tightly sleeved on the part of the working pipe 1 located in the drilling gap. Its two ends are firmly connected to the working pipe 1 through special adhesives or fastening devices to ensure that the bladder 2 will not loosen or fall off due to pressure changes or minor displacements of the working pipe 1 during the grouting and gas drainage processes, thus providing a reliable guarantee for the plugging effect. The grouting hole 11 is located within the coverage of the bladder 2 and at an appropriate position between the upper and lower ends. The selection of this position is optimized based on the expansion characteristics of the bladder 2 and the slurry diffusion law to ensure that the bladder 2 can fully fill the gap between the working pipe 1 and the drilling hole after grouting, forming a tight and stable sealing structure.

[0043] In this embodiment, the grouting pipe 3 extends from the outside of the drilling hole into the working pipe 1 through the bottom port of the working pipe 1 and passes through the grouting hole 11 to extend into the bladder 2. The grouting pipe 3 includes a main section 31, an abutting section 32, and a limiting section 33 that are connected in sequence from bottom to top. The abutting section 32 and the limiting section 33 are the parts for passing through the grouting hole 11. The outer diameter of the main section 31 matches the inner diameter of the grouting hole 11 to ensure that the slurry can pass smoothly during the grouting process, and at the same time effectively prevent the slurry from leaking from the gap between the grouting hole 11 and the grouting pipe 3, maintaining the stability of the grouting pressure and ensuring the plugging quality. The outer diameter of the main section 31 is greater than or equal to the outer diameter of the limiting section 33 which is greater than the outer diameter of the abutting section 32. This design of the outer diameter difference lays the foundation for the coordinated work with the locking and sealing assembly 4, enabling it to precisely cooperate with the locking and sealing assembly 4 under different grouting stages and pressure conditions to achieve stable and efficient plugging operations.

[0044] In this embodiment, the locking and sealing assembly 4 is installed on the working pipe 1. When the bladder 2 is not filled with slurry, the locking and sealing assembly 4 can restrict the grouting pipe 3 from being pulled out of the grouting hole 11 from the outside to inside, ensuring the continuous and stable grouting process. When the bladder 2 is filled with slurry, under the action of the slurry pressure, the locking and sealing assembly 4 can drive the grouting pipe 3 to be pulled out of the grouting hole 11 from the outside to inside, and quickly seal the grouting hole 11 after the grouting pipe 3 is pulled out, effectively preventing the slurry from leaking and ensuring reliable plugging.

[0045] In this embodiment, the locking and closing assembly 4 specifically includes a closing member 41, an elastic member 42, and a limiting member 43. The closing member 41 is slidably assembled outside the grouting pipe 3, and a guiding inclined surface 411 is designed on the outer side of its lower end. The limiting member 43 is installed outside the working pipe 1 and is located below the grouting hole 11 and the closing member 41 to provide a limit for the movement of the closing member 41, prevent the closing member 41 from undergoing excessive displacement during operation, and ensure the stable realization of the closing function. The elastic member 42 is used to drive the closing member 41 to slide downward.

[0046] When the lower end of the closing member 41 abuts against the upper end of the abutting section 32, if the limiting section 33 slides inward toward the working pipe 1, the limiting section 33 can abut against the guiding inclined surface 411. When the thrust applied by the limiting section 33 to the guiding inclined surface 411 is not sufficient to overcome the elastic force of the elastic member 42, under the guiding action of the guiding inclined surface 411, the closing member 41 will cooperate with the limiting section 33 to prevent the grouting pipe 3 from slipping out of the grouting hole 11 from the outside to the inside; and when the limiting section 33 applies force to push the guiding inclined surface 411 to drive the closing member 41 to slide upward until the lower end is higher than the limiting section 33, if the limiting section 33 continues to be stressed, it can smoothly slip out of the grouting hole 11. At this time, the closing member 41 will quickly slide downward under the elastic force of the elastic member 42. When the closing member 41 slides downward to abut against the limiting member 43, the closing member 41 will tightly close the grouting hole 11 to prevent the slurry from leaking.

[0047] In this embodiment, the closing member 41 is designed as a cylindrical structure sleeved outside the working pipe 1, and through the structural design of the limiting chute 12 and the limiting protrusion 413, it is ensured that it cannot rotate axially relative to the working pipe 1, thereby ensuring that the closing effect of the closing member 41 is highly stable during the entire working process.

[0048] In this embodiment, the upper and lower ends of the elastic member 42 are respectively connected to the closing member 41 and the working pipe 1. Among them, the lower end of the elastic member 42 is located below the grouting hole 11. This layout design fully considers the movement trajectory of the elastic member 42 during the operation of the device to ensure that the closing member 41 can move downward to completely close the grouting hole 11. In practical applications, a suitable elastic member 42 can be selected according to different engineering requirements and working conditions. For example, when a large elastic force is required, a tension spring can be selected; when higher requirements for the compactness and light weight of the device are required, the elastic rubber band 421 is a suitable choice.

[0049] To further optimize the working performance of the elastic member 42 and the overall stability of the device, a design solution can be adopted where two elastic members 42 are symmetrically distributed on the left and right sides of the grouting hole 11. This symmetrical layout can effectively balance various forces acting on the sealing member 41 during movement, prevent it from shifting or tilting, and thus ensure a reliable elastic driving effect. The lower end of the elastic member 42 is connected to the limiting member 43, and the upper end is connected to the sealing member 41 through the connecting member 412. The limiting member 43 and the connecting member 412 are respectively provided with a lower annular groove 431 and an upper annular groove 4121, and the upper and lower ends of the elastic member 42 are respectively assembled in the upper annular groove 4121 and the lower annular groove 431. This connection method not only facilitates the installation and replacement of the elastic member 42, but also can effectively ensure the position stability of the elastic member 42 during operation, prevent it from shifting or falling off, thus ensuring the reliable operation of the entire device, guaranteeing the smooth progress of the gas drainage borehole plugging operation, and reducing the risk of gas leakage caused by component failures.

[0050] When conducting gas borehole drainage operations and needing to plug the gap between the working pipe and the borehole, the installation and use of this borehole plugging device can be carried out according to the following steps:

[0051] After completing the borehole and inserting the working pipe 1, first conduct a comprehensive and detailed quality inspection on all components such as the working pipe 1, the bladder 2, the grouting pipe 3, and the locking and sealing assembly 4 to ensure that each component is free of damage, deformation, or other defects, so as to ensure the normal operation of the device and reduce the risk of failures during the plugging process. Select appropriate specifications of components for assembly according to the actual size of the borehole and the specific requirements of the project. Slowly insert the grouting pipe 3 from the bottom port of the working pipe 1 to ensure that the main section 31, the abutting section 32, and the limiting section 33 of the grouting pipe 3 pass through the inside of the working pipe 1 in sequence until the abutting section 32 and the limiting section 33 extend into the bladder 2 through the grouting hole 11.

[0052] Next, install the locking and sealing assembly 4. Slip the sealing member 41 over the outside of the grouting pipe 3 and position it at the designated position on the working pipe 1 to ensure that the guiding inclined surface 411 at the lower end of the sealing member 41 corresponds to the limiting section 33 of the grouting pipe 3. Install the lower end of the elastic member 42 in the lower annular groove 431 of the limiting member 43 and the upper end in the upper annular groove 4121 of the connecting member 412 of the sealing member 41 to ensure that the elastic member 42 is firmly installed and in an appropriate pre-tightened state so that it can function stably in the subsequent operation. During the installation process, carefully check whether the connections of all components are tight to ensure that the locking and sealing assembly 4 can work properly, guarantee the reliability of the gas drainage borehole plugging, and prevent plugging failures caused by component installation problems.

[0053] Then, put the sac 2 on the outside of the working pipe 1, and use high-strength sealant or special fastening technology (such as metal clamps resistant to high temperature and gas corrosion, etc.) to tightly fix both ends of the sac 2 on the working pipe 1, ensuring a firm and well-sealed connection between the sac 2 and the working pipe 1, preventing loosening or leakage during subsequent grouting and plugging processes, guaranteeing the safety of gas drainage borehole plugging, and avoiding gas leakage accidents caused by poor sealing.

[0054] After the assembly of the device is completed, the grouting operation can be carried out. Connect the grouting equipment to the grouting pipe 3 and prepare the appropriate slurry according to the engineering requirements. At the initial stage of grouting, since the space inside the sac 2 is relatively large and the slurry pressure is relatively low, at this time, the sealing member 41 of the locking and closing assembly 4, under the action of the elastic member 42, cooperates with the limiting section 33 of the grouting pipe 3 to restrict the movement of the grouting pipe 3, ensuring that the slurry can be smoothly injected into the sac 2 and will not leak from the grouting hole 11, guaranteeing the sealing performance of the gas drainage borehole plugging. As the grouting process continues, the slurry inside the sac 2 gradually increases and the pressure continuously rises. When the sac 2 is nearly full, the slurry pressure reaches a certain level, which is sufficient to push the limiting section 33 of the grouting pipe 3 to overcome part of the elastic force of the elastic member 42, causing the limiting section 33 to push the sealing member 41 to slide upward along the guiding direction of the guiding inclined surface 411.

[0055] When the lower end of the limiting section 33 slides upward to a position higher than the lower end of the sealing member 41, if the slurry pressure continues to increase, the grouting pipe 3 will be disengaged from the grouting hole 11 from the outside to the inside under the action of the slurry pressure. At this time, the sealing member 41 quickly slides downward under the strong elastic force of the elastic member 42 until it tightly abuts against the limiting member 43, thus completely closing the grouting hole 11, effectively preventing slurry leakage, ensuring the tightness of the gas drainage borehole plugging, effectively preventing gas leakage, and guaranteeing the safety of coal mine production.

[0056] Since the grouting pipe 3 is located inside the working pipe 1, compared with the traditional technology of setting the grouting pipe outside the working pipe, this internal setting method will not form two strip-shaped gaps 5 with sharp corners facing each other in cross-section. Therefore, there will be no sealing difficulties, which reduces the sealing difficulty, can avoid slurry leakage during the grouting process, and thus avoid material waste. After the slurry solidifies and forms, there will be no gas leakage risk points, reducing the gas leakage risk and having higher safety.

[0057] It is worth mentioning that the grouting pipe 3 can be recovered after it is withdrawn from the grouting hole 11 from the outside to the inside under the action of the slurry pressure. After the recovered grouting pipe 3 undergoes cleaning, inspection and necessary maintenance procedures, it can be put into use again in subsequent borehole plugging operations. This not only reduces the material waste caused by single-use, lowers the project cost, but also helps reduce the accumulation of waste at the construction site, meeting the concepts of environmental protection and sustainable development. At the same time, for the overall process of borehole plugging operations, the recoverability of the grouting pipe 3 makes equipment management more convenient and efficient, reduces the time and capital costs brought about by frequent procurement of new grouting pipes, improves the overall efficiency and economic benefits of the project construction, and further highlights the creative advantages of the present invention in the field of borehole plugging technology.

[0058] During the engineering construction process, in order to further optimize the performance of the device, the parameters of the device can be adjusted according to different drilling conditions and engineering requirements. For example, according to factors such as the depth and diameter of the borehole and the permeability characteristics of the formation, the pipe diameters and wall thicknesses of the working pipe 1 and the grouting pipe 3 are reasonably selected. In deep boreholes or high-pressure formations, pipes with larger diameters and thicker wall thicknesses should be selected to ensure that the device can withstand greater pressures and stresses, and guarantee the safety of gas drainage borehole plugging; while in shallow boreholes or low-pressure formations, the specifications of the pipes can be appropriately reduced to reduce costs and construction difficulties, improve engineering efficiency, and at the same time ensure that the plugging requirements are met.

[0059] At the same time, according to the properties of the slurry and the requirements of the grouting speed, a suitable elastic member 42 is selected. For slurries with higher viscosities or slower grouting speeds, an elastic member 42 with a smaller elastic coefficient can be selected to ensure the smooth withdrawal of the grouting pipe 3 and the effective sealing of the grouting hole 11 under lower slurry pressures; while for slurries with lower viscosities or faster grouting speeds, an elastic member 42 with a larger elastic coefficient is required to prevent premature sealing or insufficient sealing during the grouting process, guarantee the reliability of gas drainage borehole plugging, and ensure good plugging effects under different slurry conditions.

[0060] In addition, in terms of the material selection of the device, the working pipe 1 and the grouting pipe 3 can be made of high-strength alloy steel or corrosion-resistant engineering plastics to ensure that they have sufficient strength and durability in the harsh gas drainage environment, guarantee the stability of gas drainage borehole plugging, and effectively prevent gas leakage for a long time. The bladder 2 can be made of high-strength, anti-aging rubber materials or special polymer materials to ensure its sealing performance during the grouting process and meet the special requirements of gas drainage borehole plugging. The sealing member 41 and the limiting member 43 can be made of wear-resistant and corrosion-resistant metal materials and undergo appropriate surface treatments (such as galvanizing, spraying anti-corrosion coatings, etc.) to improve their service life and working reliability, ensure the smooth progress of gas drainage borehole plugging operations, and reduce the equipment maintenance and replacement frequency.

[0061] In summary, the present invention discloses a drilling plugging device, which has remarkable creativity and practicability in terms of structural design and function realization. By skillfully arranging the grouting pipe inside the working pipe and combining with a unique locking and sealing component, the key problems of poor sealing of the grouting pipe and difficulty in recovering the component in the traditional technology are effectively solved. In the operation of plugging the gas drainage borehole, the working pipe can reliably undertake the task of gas diversion, while the bladder, grouting pipe and locking and sealing component cooperate closely to ensure the efficiency and stability of the plugging process. Compared with the prior art, the drilling plugging device of the present invention has obvious advantages in terms of safety, economy and environmental protection, can strongly promote the development of the gas drainage borehole plugging technology, provide technical guarantee for the safe production and efficient operation of related industries such as coal mines, and has certain market application prospects and industry popularization value.

[0062] The above embodiments are only used to exemplarily illustrate the principles and effects of the present invention, rather than to limit the present invention. Any person familiar with this technology can modify or change the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or changes completed by those with ordinary knowledge in the technical field without departing from the spirit and technical idea disclosed by the present invention should still be covered by the claims of the present invention.

Claims

1. A drilling plugging device, characterized in that, Comprising: A working pipe with grouting holes on its side surface; A bladder bag sleeved outside the working pipe, with both ends fixed and covering the grouting holes; A grouting pipe, which includes a main section, an abutting section and a limiting section connected in sequence from bottom to top. The grouting pipe extends into the working pipe through the main section and extends out of the grouting hole through the abutting section and the limiting section. The outer diameter of the main section matches the inner diameter of the grouting hole, and the outer diameter of the main section is greater than or equal to the outer diameter of the limiting section and greater than the outer diameter of the abutting section; A locking and closing assembly, which includes a closing member sleeved on the working pipe, a limiting member located below the grouting hole for the closing member to abut against, and an elastic member for driving the closing member to slide downward; When the lower end of the closing member abuts against the upper end of the abutting section, if the limiting section slides towards the inner side of the working pipe, the limiting section can abut against the guiding inclined surface at the lower end of the closing member. When the limiting section forces the guiding inclined surface, it can drive the closing member to slide upward.

2. The drilling plugging device according to claim 1, characterized in that: The closing member is a cylindrical structure sleeved outside the working pipe, and the closing member cannot rotate axially relative to the working pipe.

3. The drilling plugging device according to claim 2, characterized in that: A limiting protrusion is arranged inside the closing member, and a limiting sliding groove parallel to the axial direction of the working pipe is formed on the outside of the working pipe. The limiting protrusion is slidably assembled in the limiting sliding groove.

4. The drilling plugging device according to claim 1, characterized in that: The upper and lower ends of the elastic member are respectively connected to the closing member and the working pipe. Among them, the lower end of the elastic member is located below the grouting hole.

5. The drilling plugging device according to claim 4, characterized in that: There are two elastic members, and the two elastic members are symmetrically distributed on the left and right sides of the grouting hole.

6. The borehole plugging device according to claim 4, characterized in that: The lower end of the elastic member is connected to the limiting member, and the upper end of the elastic member is connected to the closing member through a connecting member.

7. The drilling plugging device according to claim 6, characterized in that: The limiting member and the connecting member are respectively provided with a lower annular groove and an upper annular groove, and the upper and lower ends of the elastic member are respectively assembled in the upper annular groove and the lower annular groove.

8. The borehole plugging device according to claim 7, characterized in that: The elastic member is an elastic rubber band.

9. The drilling plugging device according to claim 7, characterized in that: The elastic member is a tension spring.

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