Auxiliary water injection device for explosion-proof water bag in mine

Abstract

The invention discloses an auxiliary water injection device for an explosion-proof water bag under a mine. The auxiliary water injection device comprises a branch valve connected with a main water supply pipe of a roadway, the branch valve is also connected with a branch pipeline which is consistent with the trend of the roadway; a plurality of sub-pipelines are arranged on the branch pipeline in parallel; a sub-pipe valve is mounted on each sub-pipeline; each sub-pipe valve is connected with a plurality of branch pipelines, each branch pipeline is provided with a plurality of water injection holes, and each water injection hole faces the corresponding explosion-proof water bag; water is taken from the main water supply pipe of the roadway, and the water supply pipe network of the explosion-proof water bags is designed, so that water can be supplemented to the explosion-proof water bags; moreover, the water supply pipe network is divided into a plurality of sub-pipe networks, so that the explosive-proof water bags can be managed in groups and areas, fine water replenishing operation is facilitated, and the water replenishing efficiency of the explosive-proof water bags is improved.

Description

Technical Field

[0001] This invention belongs to the field of explosion-proof water bag auxiliary water injection technology, and particularly relates to an explosion-proof water bag auxiliary water injection device in mines. Background Technology

[0002] As a crucial component of my country's energy system, safe production in coal mines has always been a core issue for the industry's development. According to data from the National Mine Safety Administration, gas and coal dust explosions account for 21% of all fatal accidents in coal mines. These accidents are characterized by their high destructiveness and high casualty rate, seriously threatening miners' lives and the order of coal mine production.

[0003] As a "key barrier" in the underground ventilation safety system, the explosion-proof water bag works by absorbing the explosion energy and inhibiting the spread of flames through the water mist formed by the rupture of the water bag when an explosion occurs, thereby reducing the scope of the disaster's impact.

[0004] The two wings of the mine, adjacent mining areas, and adjacent coal seams must be separated by water sheds or rock powder sheds. Adjacent coal faces, coal roadways connected to them, coal bunkers connected to them, and other locations with independent ventilation and a risk of coal dust explosion connected to them must be separated by water sheds, rock powder sheds, or specially designed mechanical automatic explosion-proof devices. The spacing between the sheds should be 1.2-3 meters, and the number of sheds in a single roadway can reach dozens to hundreds. Weekly inspections and regular water replenishment are required.

[0005] The protective effectiveness of explosion-proof water bags is highly dependent on the degree of water filling and the timeliness of maintenance. Currently, most coal mines in China still use the traditional manual water injection method. In the complex underground environment (narrow spaces, high gas risk, damp and dusty conditions), this method has exposed problems such as cumbersome operation procedures, low work efficiency, and prominent safety risks, becoming a bottleneck restricting safe ventilation operations in coal mines. Therefore, developing auxiliary devices that are adapted to underground working conditions and can achieve efficient and precise water injection has become an urgent need to improve the level of ventilation safety in coal mines. Summary of the Invention

[0006] The purpose of this invention is to provide an auxiliary water injection device for explosion-proof water bags in mines, so as to improve the water injection efficiency of explosion-proof water bags.

[0007] The present invention adopts the following technical solution: an auxiliary water injection device for explosion-proof water bags in mines, including a branch valve connected to the main water supply pipe of the roadway; The branch valve is also connected to a branch pipeline that runs in the same direction as the tunnel. Several sub-pipes are connected in parallel on the branch pipeline; Each sub-pipeline is equipped with a sub-pipeline valve; Each sub-pipe valve is connected to several branch pipes, and each branch pipe has multiple water injection holes, with each water injection hole facing the corresponding explosion-proof water bag.

[0008] The beneficial effects of this invention are: by taking water from the main water supply pipe in the tunnel and designing a water supply network for the explosion-proof water bags, the invention can replenish the explosion-proof water bags; moreover, dividing the water supply network into several sub-networks allows for grouped and regional management of the explosion-proof water bags, facilitating precise water replenishment operations and improving the water replenishment efficiency of the explosion-proof water bags. Attached Figure Description

[0009] Figure 1 This is a schematic diagram of the structure of an auxiliary water injection device for explosion-proof water bags in coal mines, according to an embodiment of the present invention. Figure 2 This is a schematic diagram of the structure of an underground explosion-proof water bag auxiliary water injection device in a coal mine, from another perspective, according to an embodiment of the present invention. Figure 3 This is a schematic diagram of the structure of an underground explosion-proof water bag auxiliary water injection device in a coal mine, from another perspective, according to an embodiment of the present invention. Figure 4 This is a diagram showing the positional relationship between the second water inlet pipe and the explosion-proof water bag in an embodiment of the present invention; Figure 5 This is a schematic diagram showing the corresponding structure of the outlet of the second water inlet pipe and the explosion-proof water bag in an embodiment of the present invention.

[0010] Among them: 10. Tunnel; 20. Main water supply pipe of tunnel; 30. Branch valve; 40. Branch pipeline; 50. Sub-pipeline; 60. Branch pipeline; 70. First water inlet pipe; 80. Second water inlet pipe; 90. Explosion-proof water bag. Detailed Implementation

[0011] The present invention will now be described in detail with reference to the accompanying drawings and specific embodiments.

[0012] Currently, the level of intelligence and integration of explosion-proof water bag maintenance equipment in domestic coal mines is low, and most of it relies on manual operation.

[0013] Research on explosion-proof water bags for coal mines in China began in the 1980s. Early studies mainly focused on optimizing the material of the water bags and improving the hanging methods to enhance their impact resistance and installation stability. For example, Wang Jianguo et al. compared the burst pressure and water mist diffusion range of explosion-proof water bags made of different materials (PVC and nylon) and concluded that nylon water bags had superior protective performance. Zhang Lei et al. proposed the "staggered hanging method," which effectively solved the problem of uneven water mist coverage under traditional parallel hanging. In recent years, with the increasing safety requirements in coal mines, domestic scholars have begun to focus on the maintenance efficiency and intelligent level of explosion-proof water bags. Li Zhiqiang et al. developed a "semi-automatic water injection gun" that reduces water leakage by optimizing the gun head structure. However, the device still requires manual lifting of the gun to connect to the water bag, which does not fundamentally reduce labor intensity. Zhao Wei et al. proposed an explosion-proof water bag water volume monitoring system based on the Internet of Things. This system monitors the water volume in real time by installing a liquid level sensor inside the water bag. However, this system only solves the "water volume monitoring" problem and does not involve the "efficient water injection" process, thus failing to form a "monitoring-water injection" closed loop.

[0014] Overall, existing domestic research focuses on optimizing the single performance of explosion-proof water bags or upgrading their monitoring functions, lacking systematic research and development of "high-efficiency water injection devices." An integrated solution that can integrate "centralized control, directional water injection, and sealing and leak prevention" has not yet been formed, and there is still a gap between it and the actual needs of underground coal mine operations.

[0015] Research on explosion-proof water bags for coal mines abroad (represented by the United States, Australia, and Germany) began in the 1970s, with early research focusing on the protective theory and numerical simulation of explosion-proof water bags. For example, the U.S. Bureau of Mines (USBM), in its 2000 "Design Guidelines for Explosion-Proof Water Bags in Coal Mines," established a quantitative relationship between water bag volume, hanging spacing, and protection range through numerous explosion tests, providing a theoretical basis for water bag deployment. The Commonwealth Scientific and Industrial Research Organisation (CSIRO) of Australia used FLUENT software to simulate the diffusion of water mist under different explosion intensities, optimizing the water bag placement density. Regarding explosion-proof water bag maintenance equipment, international research places greater emphasis on automation and intelligentization. The German company DBT has developed a "tunnel inspection robot" that can carry a water injection device and move along the tunnel. It uses a robotic arm to connect and inject water into the water bags. However, the equipment is expensive (costing over 5 million yuan per unit) and has poor flexibility in narrow tunnels (width < 2 meters), making it difficult to promote in small and medium-sized coal mines in China. The Australian company BHP has applied a "centralized water supply system" in its coal mines. It uses a main water supply pipeline laid on the top of the tunnel and branch pipelines connected to each water bag. However, the system does not have an independent control valve, which makes it impossible to achieve accurate water injection for each bag and easily leads to problems such as water bags overflowing or not being filled.

[0016] Based on a review of current research both domestically and internationally, the following shortcomings exist in current research on explosion-proof water bags: 1. Fragmented functions: Existing research at home and abroad mainly focuses on optimizing single aspects of explosion-proof water bags (such as monitoring, materials, and hanging), lacking a systematic solution for "water injection operation", and cannot simultaneously solve the problems of "low efficiency, high leakage, and high risk" of traditional water injection. 2. Imbalance between cost and adaptability: Although foreign automated water injection equipment has a high level of technology, it is too expensive and has strict requirements for the tunnel environment, making it difficult to adapt to the diverse underground working conditions in domestic coal mines (such as narrow tunnels and unstable water supply pressure). 3. High dependence on manual labor: Most domestic water injection auxiliary equipment still requires manual participation in operations such as docking and pipe lifting, which does not fundamentally reduce labor intensity and is inconsistent with the development trend of "less manpower and no manpower" in intelligent coal mines.

[0017] Based on the above shortcomings, the explosion-proof water bag auxiliary water injection device developed in this invention, through the innovative design of "parallel control + directional water injection", achieves the goal of "reducing manual intervention and improving water injection efficiency" while ensuring low cost and high adaptability of the device, filling the technical gap of integrated zoned water injection device for explosion-proof water bags in domestic coal mines.

[0018] In traditional explosion-proof water bag 90 filling operations, workers must remain in the return airway, which has a gas risk, for extended periods (often exceeding 4 hours per roadway), and must drag long rubber hoses and lift iron pipes, which can easily lead to equipment collisions, slips, and other safety hazards. Furthermore, the water inlet of the explosion-proof water bag 90 is located at its top, close to the roadway ceiling, making it inconvenient for workers to lift and fill the bag, causing arm pain from prolonged lifting, and making it difficult to maintain a consistent water volume (due to the high height of the explosion-proof water bag 90, workers cannot observe the water level inside).

[0019] In the traditional water injection mode, it takes 6-8 hours for two workers to work continuously to inject 90 water into 60 explosion-proof water bags. During the water injection process, 15%-20% of the water resources are wasted due to leakage (mainly because water will spill into the tunnel when the workers lift and move the pipes). Afterwards, manpower is needed to clean up the water in the tunnel.

[0020] The auxiliary water injection device of the present invention can significantly shorten the time personnel spend in high-risk areas by reducing manual operation, thereby reducing the risk of gas and coal dust exposure. At the same time, by precisely controlling the water injection volume, it ensures that each water bag is fully filled, avoiding the problem of protective failure caused by "empty bags", and further strengthening the underground explosion protection barrier.

[0021] The auxiliary water injection device can significantly reduce labor input and resource waste by simplifying the operation process and reducing leakage rate. According to on-site calculations, the device can save more than 500,000 yuan per year in a coal mine with an annual output of 2 million tons, with an investment payback period of only one month, providing an effective way for Xiangshan Coal Mine to reduce costs and increase efficiency.

[0022] This invention integrates decentralized water injection operations into centralized control through the innovative design of "parallel control module + directional water injection circuit", breaking through the technical limitations of traditional "moving hose + manual pipe lifting" and providing a feasible technical solution for the intelligent upgrading of coal mine ventilation safety equipment, further improving the technical system of coal mine underground auxiliary operation equipment.

[0023] This invention discloses an auxiliary water injection device for explosion-proof water bags in mines, such as... Figure 1 As shown, the sidewall of the tunnel 10 typically has a main water supply pipe 20. The auxiliary water injection device includes a branch valve 30 connected to the main water supply pipe 20; the branch valve 30 is also connected to a branch pipe 40 running in the same direction as the tunnel; several sub-pipes 50 are connected in parallel on the branch pipe 40; each sub-pipe 50 is equipped with a sub-pipe valve; each sub-pipe valve is connected to several branch pipes 60, and each branch pipe 60 has multiple water injection holes, each water injection hole facing the corresponding explosion-proof water bag 90. Usually, each water injection hole corresponds to one explosion-proof water bag 90, but when the explosion-proof water bags 90 are of different sizes, two or more water injection holes can be selected for the larger explosion-proof water bag 90.

[0024] This invention draws water from the main water supply pipe 20 in the tunnel and designs a water supply network for the explosion-proof water bag 90, which can replenish the explosion-proof water bag 90. Moreover, dividing the water supply network into several sub-networks allows for grouping and regional management of the explosion-proof water bag 90, facilitating precise water replenishment operations and improving the water replenishment efficiency of the explosion-proof water bag 90.

[0025] In one embodiment, such as Figure 2 and Figure 3 As shown, the branch pipe 60 is located above the explosion-proof water bag 90, and the branch pipe 60 runs along the cross-section of the tunnel (i.e., the tunnel cross-section). Specifically, the branch pipe 60 can be tied and fixed to the tunnel roof structure for easy construction.

[0026] More specifically, all water injection holes face downwards and are located in the middle of the explosion-proof water bag 90. In this way, when the valve is opened, the water sprayed from the injection holes can fall directly into the explosion-proof water bag 90.

[0027] The parallel control module is the "control core" of the device, designed to solve the problem of traditional water injection where "one pipe and one valve cannot be controlled in different zones", and to achieve "one valve controls multiple bags, and each bag can be independently adjusted".

[0028] As a specific implementation, the water injection hole is connected to a second water inlet pipe 80, which is a bend and its bottom is located above the explosion-proof water bag 90. The bend design prevents the water flow directly sprayed from the water injection hole from impacting the explosion-proof water bag 90.

[0029] Furthermore, such as Figure 4 and Figure 5 As shown, the second water inlet pipe 80 includes a vertically curved section and a horizontal section; the top end of the vertically curved section is connected to the water inlet hole, and the bottom end is connected to the horizontal section; the other end of the horizontal section is the water outlet. Moreover, the cross-section of the water outlet is a downwardly sloping surface, and the angle between the sloping surface and the vertical surface (the surface below the line of intersection with the sloping surface) is 30~60°.

[0030] In another embodiment, each water injection hole is connected to a first water inlet pipe 70; the first water inlet pipe 70 is vertically arranged, and its bottom end is located in the water-filled space of the explosion-proof water bag 90. Although this design is not as ingenious as the water inlet pipe design in the previous embodiment, it has a simple structure and is easy to install and maintain. Moreover, it does not cause impact on the explosion-proof water bag 90 when the water pressure is not particularly high.

[0031] This invention, with the core objective of "reducing manual intervention and achieving targeted and precise water injection," designs a set of explosion-proof water bag-assisted water injection devices adapted to the complex working conditions of underground coal mines. Specific objectives include: 1. Simplify the operation process, reduce labor intensity, and enable a single person to control the water filling of multiple water bags; 2. Improve water injection efficiency, shorten the water injection time for a single water bag, and reduce the total operation time; 3. Reduce water leakage and keep the leakage rate below 1%; 4. Ensure accurate water injection, increasing the water bag fullness rate to 99%; 5. Reduce the time people spend in high-risk areas to reduce safety hazards.

[0032] In one embodiment, based on the actual working conditions of the return airway in Xiangshan Mine (roadway length 800-2000 meters, water bag hanging density 1.2-3 meters / location, underground water supply pressure 2.4-2.8 MPa), the core technical indicators of the device are determined as shown in the table below: Table 1 Core Technical Indicators Using the existing main water supply pipe in the underground coal mine (usually a DN100 steel pipe with a water supply pressure of 2.4-2.8MPa) as the water source, the DN100 steel pipe is directly connected (welded) to a KJ19 straight-through valve, and then connected to a KJ19 gate valve (i.e., the branch valve of this invention, which serves as the main water injection valve). A DN20 reducer is then used to reduce the pipe diameter. Finally, a DN20 food-grade PE pipe (made of anti-aging PE material, with a pressure resistance rating ≥2.4MPa to prevent rust contamination of the water source) is connected to a DN20 ball valve (possessing high pressure resistance and corrosion resistance, suitable for underground water containing dust and impurities) to form the main water supply branch. The design of the main water supply branch can directly utilize the existing underground water supply system, eliminating the need for additional high-pressure water pipes, thus reducing installation costs and construction difficulty.

[0033] On the main water supply branch line, a set of KJ19 specification tee fittings (material consistent with the main pipeline to ensure pipeline compatibility) is installed at intervals of 10-15 meters (corresponding to 5-8 explosion-proof water bags). Each set of tee fittings is connected to a miniature ball stop valve (with low operating torque, easy for one person to control with one hand, i.e., the sub-pipe valve in this invention), forming an independent "branch control unit".

[0034] Each branch control unit can cover 5-8 water bags. Operators can control the centralized water injection of water bags in the area by operating the corresponding valves, avoiding the tedious operation of "connecting bags one by one and repeatedly moving pipes" in the traditional mode.

[0035] To ensure stable operation of the equipment in the complex downhole environment, safety protection components are installed at the starting point of the main water supply pipeline and at the inlet of each branch unit: 1. Pressure gauge: Select a shock-resistant pressure gauge with a range of 0-6MPa to monitor pipeline pressure in real time and avoid pipeline rupture due to excessive pressure; 2. One-way check valve: Installed at the inlet of each branch unit, it can prevent water from flowing back to the main pipeline when filling a single bag, ensuring that each branch unit operates independently and does not interfere with each other, and avoiding the impact of a failure of a certain unit on the overall water filling operation.

[0036] The directional water injection system is designed as the "execution terminal" of the device. Its core function is to directionally deliver the water source from the control module to each explosion-proof water bag 90, solving the problems of "leakage and difficulty in alignment" in traditional water injection, and achieving "precise alignment and leak-free water injection".

[0037] DN20 food-grade PE pipes are led out from the miniature shut-off valves of each branch control unit and laid along the explosion-proof water bag hangers (usually angle steel supports) at the top of the roadway. Metal pipe clamps (50cm apart) are used to fix the pipes to the supports. This design can prevent the pipes from shifting due to roadway vibration, personnel contact, or mine car passage, ensuring the stability of the pipe position and laying the foundation for subsequent precise docking of the water bags.

[0038] Directly above each row of explosion-proof water bags (usually 3-5 per row, spaced 2 meters apart), an 8mm PE pipe (with good flexibility and easy to fine-tune its position, i.e., the first inlet pipe 70 or the second inlet pipe 80 mentioned above) is led out through a 12mm to 8mm tee fitting.

[0039] When using the second inlet pipe 80, the end of the thin PE pipe is cut at a 30-60° angle (preferably 45°). This angled design increases the water flow rate (by 30% compared to a straight inlet) while reducing the impact of the water flow on the inner wall of the explosion-proof water bag 90, preventing the water bag from breaking due to long-term impact. In addition, the length of the thin PE pipe is controlled at 10-15cm to ensure that the end can be accurately inserted into the water bag's inlet, preventing water from spilling out.

[0040] The explosion-proof water bag auxiliary water injection device was put into trial use from March to August 2025 in three return airways (total length 6000 meters, with 300 explosion-proof water bags, each with a volume of 60L) of a coal mine with an annual output of 2 million tons. During the trial period, water replenishment operations were carried out once a week and a full water replacement was performed once a month, strictly in accordance with the requirements of the "Coal Mine Safety Regulations". Data such as water injection time, leakage rate, personnel stay time, and working hours were recorded in real time and compared with the data of the traditional water injection mode.

[0041] Regarding water injection time, in the traditional mode, injecting water into a single explosion-proof water bag requires multiple steps: "pipe preparation - pipe transfer - docking - water injection - disassembly," taking 25-30 minutes. With the auxiliary device, operators only need to open the corresponding branch control valve to achieve automatic water injection, reducing the time per location to 5-8 minutes and increasing efficiency by approximately 70%. Based on 300 water bags, the water injection time for a single full tunnel is reduced from the traditional 62.4 hours (2 workers working continuously for 30 days, 2 hours per day) to 27.7 hours (2 workers working continuously for 13.8 days, 2 hours per day), saving 34.7 hours of operation time per week.

[0042] The auxiliary device completely eliminates the cumbersome operation of "dragging a 30-50 meter high-pressure hose and lifting a 1 kg iron water injection pipe" in the traditional mode. The operator only needs to operate at the branch control valve on one side of the roadway, and a single person can complete the water injection control of 5-8 water bags. At the same time, there is no need to move the pipe. The problem of water accumulation on the roadway floor in the traditional mode is completely solved, and the amount of water cleaning work is reduced by more than 90%, which further reduces the subsequent maintenance costs and the risk of personnel slipping.

[0043] Regarding labor costs, under the traditional model, filling 300 water bags requires 2 workers for 66.4 hours per week, totaling 416 hours per week. With the auxiliary device, only 2 workers are needed for 27.7 hours, reducing the total labor time to 110.8 hours per week, a reduction of over 50%. Based on an average hourly wage of 125 yuan for underground coal mine workers, this device can save 38,150 yuan per week (416 - 110.8) × 125, 152,600 yuan per month (4 weeks), and an average annual saving of 1,831,200 yuan (12-month operating period).

[0044] Regarding water resource costs, the leakage rate of traditional water injection methods reaches 15%-20%, while the leakage rate is reduced to below 1% after using auxiliary devices. Assuming a single water bag volume of 60L and water injection once a week, 300 water bags can save 164,160L ​​(equivalent to 164.16 tons) of water annually (12 months, 48 ​​weeks) using the following method: 300 × 60 × (19%) × 48 = 164,160L. At an industrial water price of 2 yuan / ton, this translates to an annual water cost saving of 328.32 yuan.

[0045] The leakage rate of traditional water injection methods reaches 15%-20%, while the leakage rate is reduced to below 1% after using auxiliary devices. Assuming a single water bag volume of 60L and water injection once a week, 300 water bags can save 164,160L ​​(equivalent to 164.16 tons) of water annually (12 months, 48 ​​weeks). Based on an industrial water price of 2 yuan / ton, this translates to an annual water cost saving of 328.32 yuan.

[0046] The initial investment for this auxiliary water injection device (including the purchase and installation of equipment such as pipelines, valves, connectors, and pressure gauges) is approximately 10,000 yuan. Considering only the savings in labor costs (an average of 1,831,200 yuan per year), the investment payback period is approximately 2 days (1 ÷ 1,831,200 ≈ 2 days), demonstrating extremely high cost-effectiveness.

[0047] In the traditional mode, workers need to stay in the high-gas-risk return airway for 62.4 hours per week. After adopting the auxiliary device, the stay time is reduced to 27.7 hours per week, a reduction of 55.6%, which significantly reduces the risk of gas and coal dust exposure. At the same time, there is no need to drag long rubber hoses (avoiding collisions with monitoring cables and lighting equipment) or climb ladders (avoiding falls from heights), reducing the safety hazards of personnel slipping and equipment damage by more than 80%.

[0048] The auxiliary device precisely controls the water injection volume through a miniature shut-off valve and sets the injection time (5 minutes) according to the water bag volume (60L), ensuring that each water bag is fully filled without overflow, completely solving the problem of "some water bags being empty and others overflowing" in the traditional mode. On-site testing shows that the water bag fullness compliance rate has increased from the traditional 75% to 99%, ensuring the protective effectiveness of the explosion-proof water bags in explosion accidents and further strengthening the underground safety barrier.

[0049] Therefore, it can be seen that the "parallel control module + directional water injection circuit" auxiliary water injection device, designed to address the pain points of traditional explosion-proof water bag injection operations—namely, "cumbersome operation, low efficiency, high risk, and serious leakage"—achieves the functions of "centralized control, zoned management, and precise water injection," effectively breaking through the technical bottlenecks of traditional operations. Field trial data shows that the device can reduce the water bag injection time at a single location by 70%, reduce the time workers spend in high-risk areas by 55.6%, increase the water bag fullness compliance rate to 99%, and reduce the leakage rate to below 1%, significantly outperforming the traditional mode in terms of efficiency and safety. The device can save more than 1.5 million yuan in costs annually, with an investment payback period of only 2 days, demonstrating extremely high economic cost-effectiveness and providing an effective way for coal mining enterprises to reduce costs and increase efficiency. Based on the existing underground water supply system, the device is easy to install, highly adaptable, and can meet the working conditions of different roadways of different lengths and different water bag hanging densities, making it valuable for widespread promotion in similar coal mines.

[0050] In addition, intelligent upgrades can be carried out: by combining Internet of Things technology, liquid level sensors and remote control systems can be integrated into the auxiliary water injection device to realize closed-loop management of "real-time water volume monitoring - automatic water injection - abnormal warning", further reducing manual intervention and promoting the maintenance of explosion-proof water bags towards "unmanned" development.

[0051] Material optimization: The current equipment uses PE and ordinary metal materials for pipelines and valves. In the future, high pressure resistant and impact resistant composite materials (such as glass fiber reinforced plastic) can be developed to improve the service life of the equipment in complex downhole environments (high dust, high humidity, impact). Multifunctional integration: The "water bag cleaning" function is added to the directional water injection system. By installing high-pressure spray heads in the water injection pipeline, the inner wall of the water bag is cleaned regularly to prevent the accumulation of scale and impurities from affecting the rupture performance of the water bag, and further improve the overall protective performance of the explosion-proof water bag.

Claims

1. An auxiliary water injection device for explosion-proof water bags in mines, characterized in that, Including branch valves (30) connected to the main water supply pipe (20) of the tunnel; The branch valve (30) is also connected to a branch pipeline (40) that runs in the same direction as the roadway. Several sub-pipes (50) are connected in parallel on the branch pipe (40); Each of the sub-pipes (50) is equipped with a sub-pipe valve; Each of the sub-pipe valves is connected to several branch pipes (60), each branch pipe (60) having multiple water injection holes, each of which faces the corresponding explosion-proof water bag (90).

2. The mine explosion-proof water bag auxiliary water injection device as described in claim 1, characterized in that, The branch pipe (60) is located above the explosion-proof water bag (90), and the branch pipe (60) is arranged along the cross-section of the roadway.

3. The mine explosion-proof water bag auxiliary water injection device as described in claim 2, characterized in that, The water injection holes all face downwards and are located in the middle of the explosion-proof water bag (90).

4. The mine explosion-proof water bag auxiliary water injection device as described in claim 2 or 3, characterized in that, The water injection hole is connected to a second water inlet pipe (80), which is a bent pipe and its bottom is located above the explosion-proof water bag (90).

5. The mine underground explosion-proof water bag auxiliary water injection device as described in claim 4, characterized in that, The second inlet pipe (80) includes a vertically curved section and a horizontal section; The top end of the vertically curved section is connected to the water injection hole, and the bottom end is connected to the horizontal section. The other end of the horizontal section is the water outlet.

6. The mine explosion-proof water bag auxiliary water injection device as described in claim 5, characterized in that, The cross-section of the water outlet is a downward sloping plane, and the angle between the sloping plane and the vertical plane is 30~60°.

7. The mine explosion-proof water bag auxiliary water injection device as described in claim 2 or 3, characterized in that, Each water injection hole is connected to a first water inlet pipe (70); The first water inlet pipe (70) is set vertically, and its bottom end is located in the water-filled space of the explosion-proof water bag (90).

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