A rapid sealing and seepage prevention device for mine drilling

Abstract

This application relates to the technical field of mining engineering equipment, and in particular to a rapid sealing and seepage prevention device for mining boreholes. The device includes an expansion sealing pipe and a seepage prevention sealing ring. The seepage prevention sealing ring is installed on the outer ring of the expansion sealing pipe. A pressure chamber is provided inside the expansion sealing pipe, and an air inlet assembly is installed on the expansion sealing pipe, communicating with the pressure chamber. This invention allows for rapid connection to an external air source via the air inlet assembly, enabling rapid expansion of the expansion sealing pipe without the need for on-site material preparation or cumbersome installation procedures. Simultaneously, the expansion pressure can be adjusted using the sub-cavities formed by the pressure chamber, branch pipe micro-valve, and partition plate. This allows for adaptation to boreholes of different diameters due to variations in mining equipment or processes, eliminating the need to prepare multiple specifications of sealing components, shortening sealing operation time, reducing operating costs and complexity, and meeting the requirements for high-efficiency operation.

Description

Technical Field

[0001] This application relates to the technical field of mining engineering equipment, and in particular to a rapid sealing and seepage prevention device for mining boreholes. Background Technology

[0002] In mining and related engineering, high-pressure fracturing and grouting reinforcement are commonly used techniques: high-pressure fracturing involves injecting high-pressure media into the borehole to fracture the rock mass, thereby improving resource extraction efficiency; grouting reinforcement involves injecting grout into the borehole to fill the gaps in the rock mass and enhance its stability.

[0003] Traditional seals often use rigid plugs or filling seals, such as cement plugs or rubber plugs that are hammered in. These require on-site material preparation or multiple hammering installations, which is time-consuming and difficult to meet the needs of efficient operations. Rigid plugs are prone to gaps with the borehole wall, and flexible plugs lack adjustable pressure support, making them prone to deformation or displacement under high pressure, leading to leakage. Single-size seals are only suitable for fixed-diameter boreholes, and the borehole diameter in mining sites often fluctuates due to differences in equipment or processes, requiring the preparation of multiple sizes of seals, which increases operating costs and complexity. Utility Model Content

[0004] In order to overcome the shortcomings of existing mine borehole sealing devices, such as slow sealing, easy leakage under high pressure, and poor hole diameter adaptability, this application provides a rapid sealing and seepage prevention device for mine boreholes.

[0005] This application provides a rapid sealing and seepage prevention device for mine drilling, which adopts the following technical solution: it includes an expansion sealing pipe and a seepage prevention sealing ring. The seepage prevention sealing ring is installed on the outer ring of the expansion sealing pipe. A pressure chamber is provided inside the expansion sealing pipe. An air inlet component is installed on the expansion sealing pipe and the air inlet component is connected to the pressure chamber.

[0006] Optionally, the expansion sealing tube consists of an outer elastomer and a reinforcing layer; the outer elastomer is made of high-strength butyl rubber, and the reinforcing layer is an aramid fiber woven mesh.

[0007] Optionally, the expansion sealing tube has a groove on its outer side, the anti-seepage sealing ring has a U-shaped cross-section, and the inner side of the anti-seepage sealing ring is located in the groove.

[0008] Optionally, the anti-seepage sealing ring is provided in multiples and is evenly distributed along the axial direction of the expansion sealing tube; the anti-seepage sealing ring is made of nitrile rubber, and the groove is filled with polytetrafluoroethylene sealing grease; the outer wall of the anti-seepage sealing ring is provided with micro anti-slip protrusions.

[0009] Optionally, the air intake assembly includes a high-pressure pipeline, which is connected to the pressure chamber via a branch pipe. The high-pressure pipeline is equipped with a quick-release connector, which is connected to an external air source via a connecting pipe.

[0010] Optionally, multiple branch pipes are provided, and the multiple branch pipes are evenly distributed. Each branch pipe is provided with a micro valve. A partition is provided between two adjacent branch pipes. The partition is fixedly installed inside the pressure chamber, and a sub-cavity is formed between two adjacent partitions.

[0011] Optionally, the intake assembly further includes a one-way valve, which is installed in series on the high-pressure pipeline and located between the quick-release connector and the branch pipe; the one-way valve is directed to supply gas from the external gas source to the pressure chamber, and a polytetrafluoroethylene sealing gasket is embedded at the connection port between the one-way valve and the high-pressure pipeline.

[0012] In summary, this application includes the following beneficial technical effects: 1. This utility model can quickly connect to an external air source through the air intake component, enabling the expansion sealing pipe to expand rapidly without the need for on-site material preparation or cumbersome installation steps; at the same time, the expansion pressure can be adjusted by the sub-cavities formed by the pressure chamber, branch pipe micro valves, and partitions, which can adapt to different borehole diameters due to variations in mining equipment or processes. There is no need to prepare multiple specifications of sealing parts, shortening the sealing operation time, reducing operating costs and operational complexity, and meeting the needs of high-efficiency operation.

[0013] 2. This utility model employs a double sealing structure consisting of an expansion sealing tube that tightly adheres to the borehole wall and a nitrile rubber anti-seepage sealing ring. This, combined with the filling of gaps with polytetrafluoroethylene sealing grease within the groove and the enhancement of fit stability by micro-anti-slip protrusions on the outer side of the sealing ring, eliminates sealing gaps. The sub-chamber design of the pressure chamber allows for local pressure adjustment via a micro-valve, while a one-way valve prevents pressure backflow, ensuring stable sealing pressure. This avoids leakage problems caused by high-pressure cracking or deformation and displacement of the sealing components during grouting, ensuring cracking or grouting efficiency and improving operational stability. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the overall structure in an embodiment of this application; Figure 2 This is a cross-sectional view of an embodiment of this application; Figure 3 This is an embodiment of the present application. Figure 2 Enlarged view of point A in the middle; Figure 4 This is a schematic diagram of the inside of the expansion sealing tube in an embodiment of this application.

[0015] Reference numerals: 1. Expansion sealing pipe; 2. Leak-proof sealing ring; 3. Pressure chamber; 4. High-pressure pipeline; 5. Branch pipe; 6. Miniature valve; 7. Quick-release connector; 8. Partition plate; 9. Groove; 10. Outer elastomer; 11. Reinforcing layer. Detailed Implementation

[0016] The following is in conjunction with the appendix Figures 1-4 This application will be described in further detail.

[0017] This application discloses a rapid sealing and seepage prevention device for mine drilling. For example... Figure 1 , Figure 2 As shown, it includes an expansion sealing tube 1 and a leak-proof sealing ring 2. The expansion sealing tube 1 is composed of an outer elastomer 10 and a reinforcing layer 11. The outer elastomer 10 is made of high-strength butyl rubber, and the reinforcing layer 11 is an aramid fiber woven mesh. Wireless pressure sensors and temperature sensors are embedded in the outer wall of the expansion sealing tube 1. The data is transmitted to a mobile APP in real time via Bluetooth. Operators can remotely monitor the sealing pressure and the temperature inside the hole, avoiding on-site supervision. A pressure chamber 3 is provided inside the expansion sealing tube 1.

[0018] See Figure 2 As shown, an air intake assembly is installed on the expansion sealing pipe 1. The air intake assembly is connected to the pressure chamber 3. The air intake assembly includes a high-pressure pipeline 4, which is made of 304 stainless steel seamless pipe. The high-pressure pipeline 4 is connected to the pressure chamber 3 through a branch pipe 5. A quick-release connector 7 is provided on the high-pressure pipeline 4. The quick-release connector 7 is an ISO7241-B standard hydraulic quick connector with a built-in double O-ring seal. The quick-release connector 7 is connected to an external air source through a connecting pipe. The air source is a high-pressure air compressor and is equipped with a pressure safety valve.

[0019] See Figure 2 , Figure 4 As shown, there are multiple branch pipes 5, which are evenly distributed. Each branch pipe 5 is equipped with a miniature valve 6 and a miniature pressure gauge. The miniature pressure gauge displays the pressure of the corresponding sub-chamber in real time, which is convenient for precise adjustment. A partition 8 is set between two adjacent branch pipes 5. The partition 8 is fixedly installed inside the pressure chamber 3, and a sub-chamber is formed between two adjacent partitions 8. The air intake assembly also includes a one-way valve, which is located between the quick-release connector 7 and the branch pipe 5. The one-way valve is installed in series on the high-pressure pipeline 4. The one-way valve is a spring-loaded high-pressure one-way valve, and the valve body is made of brass.

[0020] See Figure 2 , Figure 3As shown, the one-way valve is directed to supply gas from the external gas source to the pressure chamber 3. A polytetrafluoroethylene (PTFE) gasket is embedded at the connection port between the one-way valve and the high-pressure pipeline 4. The anti-seepage sealing ring 2 is installed on the outer ring of the expansion sealing tube 1. A groove 9 is provided on the outer side of the expansion sealing tube 1. The cross-section of the anti-seepage sealing ring 2 is set as "U" shaped, and the inner side of the anti-seepage sealing ring 2 is set in the groove 9.

[0021] See Figure 1 , Figure 2 As shown, three anti-seepage sealing rings 2 are provided, evenly distributed along the axial direction of the expansion sealing pipe 1; the material of the anti-seepage sealing rings 2 is nitrile rubber, and the groove 9 is filled with polytetrafluoroethylene sealing grease; the outer wall of the anti-seepage sealing rings 2 is provided with micro anti-slip protrusions, which are hemispherical structures and are integrally molded by a mold. The surface of the protrusions is coated with polytetrafluoroethylene coating, which not only enhances the friction with the hole wall, but also prevents the protrusions from scratching the hole wall.

[0022] The implementation principle of a rapid sealing and seepage prevention device for mine boreholes according to an embodiment of this application is as follows: First, the sealing and seepage prevention device is slowly inserted into the target borehole in the mine until the device reaches the preset sealing operation position. Then, the device is quickly connected to an external air source through the quick-release connector 7 on the high-pressure pipeline 4. The external air source switch and the main control valve on the high-pressure pipeline 4 are opened, and at the same time, the micro valves 6 of all branch pipes 5 are slowly opened. High-pressure gas enters the pressure chamber 3 through the high-pressure pipeline 4 and the branch pipes 5. The gas fills each sub-chamber, pushing the outer elastic body 10 of the expansion sealing tube 1 to expand outward, so that the tube body initially fits against the borehole wall. According to the actual borehole diameter fluctuation, the air intake of the corresponding sub-chamber is precisely controlled by adjusting the micro valves 6 of each branch pipe 5. After high-pressure fracturing or grouting operations are completed, first stop injecting high-pressure medium into the borehole and shut off the external gas source; slowly open the micro valves 6 on all branch pipes 5 to gradually release the gas in the pressure chamber 3, so that the expansion sealing pipe 1 contracts under its own elasticity until the outer diameter of the pipe body is smaller than the borehole diameter; slowly pull out the expansion sealing pipe 1 along the borehole axis to complete the device recovery.

[0023] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A quick sealing anti-seepage device for mine drilling, comprising an expansion sealing tube (1) and an anti-seepage sealing ring (2), characterized in that: The seepage-proof sealing ring (2) is installed on the outer ring of the expansion sealing pipe (1). The expansion sealing pipe (1) has a pressure chamber (3) inside. An air inlet assembly is installed on the expansion sealing pipe (1), and the air inlet assembly is connected to the pressure chamber (3).

2. A quick sealing anti-seepage device for mine drilling according to claim 1, characterized in that: The expansion sealing tube (1) is composed of an outer elastomer (10) and a reinforcing layer (11); the outer elastomer (10) is made of high-strength butyl rubber, and the reinforcing layer (11) is an aramid fiber woven mesh.

3. A quick sealing anti-seepage device for mine drilling according to claim 1, characterized in that: The expansion sealing tube (1) has a groove (9) on its outer side, and the cross-section of the anti-seepage sealing ring (2) is set as "U" shaped. The inner side of the anti-seepage sealing ring (2) is set in the groove (9).

4. A quick sealing anti-seepage device for mine drilling according to claim 3, characterized in that: Three anti-seepage sealing rings (2) are provided and are evenly arranged along the axial direction of the expansion sealing pipe (1); the material of the anti-seepage sealing ring (2) is nitrile rubber, and the groove (9) is filled with polytetrafluoroethylene sealing grease; the outer wall of the anti-seepage sealing ring (2) is provided with micro anti-slip protrusions.

5. A quick sealing anti-seepage device for mine drilling according to claim 1, characterized in that: The air intake assembly includes a high-pressure pipeline (4), which is connected to the pressure chamber (3) via a branch pipe (5). A quick-release connector (7) is provided on the high-pressure pipeline (4), and the quick-release connector (7) is connected to an external air source via a connecting pipe.

6. A quick sealing anti-seepage device for mine drilling according to claim 5, characterized in that: Multiple branch pipes (5) are provided, and the multiple branch pipes (5) are evenly distributed. Each branch pipe (5) is provided with a micro valve (6). A partition (8) is provided between two adjacent branch pipes (5). The partition (8) is fixedly installed inside the pressure chamber (3). A sub-cavity is formed between two adjacent partitions (8).

7. A quick sealing anti-seepage device for mine drilling according to claim 6, characterized in that: The air intake assembly also includes a one-way valve, which is installed in series on the high-pressure pipeline (4) and located between the quick-release connector (7) and the branch pipe (5); the one-way valve is directed to deliver gas from the external air source to the pressure chamber (3), and a polytetrafluoroethylene sealing gasket is embedded at the connection port between the one-way valve and the high-pressure pipeline (4).

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