Coal mine plugging solution dispensing device

Abstract

The utility model discloses a coal mine leak stoppage liquid preparation device belongs to coal mine equipment field. Its technical scheme is, a coal mine leak stoppage liquid preparation device, including liquid transfer pipe and spray pipe: liquid transfer pipe includes inner tube and sleeve, and the sleeve is sleeved at the outside of inner tube, and one end of sleeve is connected with spray pipe, and the end of sleeve is equipped with fixed plate, and fixed plate is annular, and the outer edge of fixed plate is fixed in the inner wall of sleeve, and one end of inner tube is fixedly connected in the inner hole of fixed plate, and a plurality of through holes are seted up on fixed plate, and the end away from liquid transfer pipe of spray pipe is equipped with spray nozzle, and the other end of inner tube is out of the pipe wall of sleeve and is connected with baking soda solution liquid supply pump, and the other end of sleeve is connected with water glass liquid supply pump. Through the double cavity independent delivery structure of inner tube and sleeve, make baking soda solution and water glass respectively in each channel delivery, only realize first-time confluence through the through hole of fixed plate before entering spray pipe, fundamentally avoid two kinds of materials in the delivery process in advance mixed solidification, realize present preparation present use.

Description

Technical Field

[0001] This utility model relates to the field of coal mine equipment, and in particular to a coal mine leak sealing and liquid preparation device. Background Technology

[0002] During underground coal mining, geological problems such as developed fissures in the surrounding rock, remnants of goaf areas, and fault fracture zones are common, easily leading to safety hazards such as air leakage, water leakage, gas accumulation, and surrounding rock instability, seriously threatening the lives of underground workers and restricting mining efficiency. Grouting, as one of the core technologies for underground disaster management in coal mines, aims to inject chemical grout into fissures or seepage channels. The solidified grout forms a dense structure that blocks fluid penetration, achieving functions such as surrounding rock reinforcement, leak sealing, and gas isolation. Baking soda and water glass mixed grout, due to its advantages of rapid reaction, high curing strength, good sealing performance, low cost, and excellent environmental compatibility, is widely used in temporary or permanent leak sealing projects in coal mines. Its applications cover multiple key aspects, including sealing roadway wall fissures, filling goaf areas, treating pipeline interface leaks, and reinforcing fault zones.

[0003] In current coal mine grouting construction, the mixing method of sodium bicarbonate and water glass is mostly to adopt a pre-mixing mode, such as patent CN220634180U. The two materials are mixed evenly in advance at the ground mixing station or the underground temporary mixing point through a simple mixing equipment, and then the mixed slurry is transported to the working face through the grouting pump and the delivery pipeline.

[0004] However, when baking soda is mixed with water glass, a gel reaction occurs rapidly, and it can initially solidify in 1–5 minutes at room temperature. During the transportation process, especially during long-distance transportation or construction breaks, the premixed slurry is prone to gradually solidifying. The solid particles formed can clog pumps, valves, pipelines and nozzles, which not only leads to construction interruption, but also requires a lot of manpower and resources to clean the blocked parts, seriously affecting construction efficiency. Summary of the Invention

[0005] This invention addresses the problem that when using a mixture of baking soda and water glass as a leak-sealing and reinforcing slurry in coal mines, the slurry solidifies and easily causes blockage in the conveying system during pre-mixing, conveying, and spraying. It provides a leak-sealing slurry preparation device for coal mines.

[0006] To solve the above problems, the technical solution adopted by this utility model is a coal mine leak-sealing liquid preparation device, including a delivery pipe and a spray pipe: the delivery pipe includes an inner pipe and a sleeve, the sleeve is sleeved outside the inner pipe, one end of the sleeve is connected to the spray pipe, and the sleeve end is provided with a fixing plate, the fixing plate is annular, the outer edge of the fixing plate is fixed to the inner wall of the sleeve, one end of the inner pipe is fixedly connected to the inner hole of the fixing plate, the fixing plate is provided with multiple through holes, the end of the spray pipe away from the delivery pipe is provided with a nozzle, the other end of the inner pipe passes through the pipe wall of the sleeve and is connected to a sodium bicarbonate solution supply pump, and the other end of the sleeve is connected to a water glass supply pump. The dual-cavity independent delivery structure of the inner tube and the outer tube allows the baking soda solution and water glass to be delivered in their respective channels. They only need to be initially combined through the through hole of the fixed plate before entering the nozzle. This fundamentally avoids the two materials from being mixed and solidified in advance during the delivery process, allowing them to be prepared and used immediately. At the same time, the dual-cavity isolation design reduces the risk of solidification and blockage of residual slurry in the pipeline, improving material utilization while ensuring construction continuity.

[0007] As a preferred embodiment of a coal mine leak-sealing liquid preparation device, the nozzle includes a mixing pipe, one end of which is connected to the delivery pipe, and the nozzle is located at the other end of the mixing pipe. The mixing pipe is internally equipped with a flow-turbulence component. The mixing pipe and the internal flow-turbulence component force-mix the two materials before they enter the nozzle, overcoming the stratification problem caused by the different viscosities of the water glass solution and the baking soda solution, ensuring that the slurry reaches a uniform state before being sprayed out. Simultaneously, the flow-turbulence component only acts within the nozzle, not affecting the isolation of the independent dual-chamber delivery, thus balancing the immediacy of on-the-spot preparation with the stability of the mixing effect.

[0008] As a preferred embodiment of a coal mine plugging and mixing device, the turbulence-inducing component includes multiple blades. A retainer is installed inside the mixing pipe, and the blades are rotatably mounted on the retainer, with the multiple blades arranged axially along the mixing pipe. The rotatable blades passively rotate under the impact of the slurry flow, which can dynamically shear and stir the slurry after confluence, enhancing the turbulence effect and further improving the mixing uniformity. The multiple sets of blades arranged axially achieve thorough mixing, ensuring that the two materials are fully mixed within a short distance, meeting the requirements for mixing efficiency.

[0009] As a preferred embodiment of a coal mine leak-sealing slurry preparation device, the nozzle is a conical nozzle. The conical nozzle can focus the prepared mixed slurry into a high-speed jet, enhancing its penetration into the cracks and allowing the slurry to quickly fill the deep part of the leak point. At the same time, the conical structure can further enhance the shear mixing of the slurry before it is ejected by constricting the flow channel, ensuring that the slurry is in the optimal flow and reaction state when it comes into contact with the leak point, thereby improving the sealing effect.

[0010] As a preferred embodiment of a coal mine leak-sealing solution preparation device, multiple through holes are unevenly distributed axially on the fixed plate. This uneven distribution of the through holes causes the water glass inside the casing to form a jet with uneven flow velocity when entering the nozzle, creating turbulence on the sodium bicarbonate solution output from the inner tube and achieving preliminary efficient mixing.

[0011] As a preferred embodiment of a coal mine leak-sealing liquid mixing device, a proportional valve is provided at the end of the casing away from the nozzle. The first inlet of the proportional valve is connected to the water glass supply pump, and the second inlet of the proportional valve is connected to a flushing water pump. During construction breaks and after construction stops, clean water can be introduced into the casing through the flushing water pump to promptly flush the water glass in the casing and the residual slurry in the mixing pipe, avoiding pipe blockage caused by the solidification of residual slurry and ensuring the long-term reliable operation of the device. At the same time, the water glass and clean water can be mixed through the proportional valve to adjust the concentration of the water glass.

[0012] As a preferred implementation of a coal mine leak-sealing solution preparation device, two sodium bicarbonate solution supply pumps are provided, connected to the casing via a first tee; two water glass supply pumps are also provided, connected to the inner pipe via a second tee. This dual-pump redundancy design automatically switches to the other pump in case of a single pump failure, ensuring a continuous supply of sodium bicarbonate solution and water glass, avoiding material transport interruptions due to single pump shutdown, and guaranteeing the continuity of solution preparation. Simultaneously, the dual pumps can achieve a wider range of flow output through coordinated adjustment, adapting to the slurry volume requirements of different leak sizes.

[0013] As a preferred implementation of a coal mine leak-sealing solution preparation device, a first flow control valve is provided between the sodium bicarbonate solution supply pump and the inner pipe, and a second flow control valve is provided between the water glass supply pump and the casing. The first and second flow control valves can independently adjust the delivery rates of the sodium bicarbonate solution and water glass, achieving precise control of the mixing ratio of the two materials. The ratio can be dynamically adjusted according to real-time operating conditions such as the size of the leak and the leakage rate, ensuring that the slurry solidification speed and fluidity match actual requirements. Simultaneously, the valves have strong instantaneous adjustment responsiveness, avoiding the limitations of a fixed ratio in pre-mixing mode and improving the adaptability of the leak-sealing effect.

[0014] As can be seen from the above technical solutions, the beneficial effects of this utility model are as follows: This device, through its dual-cavity independent conveying structure of the inner tube and the outer sleeve, fundamentally avoids the premature mixing and solidification of baking soda solution and water glass during the conveying process, achieving continuous "preparation and use," while reducing the risk of solidification and blockage of residual slurry in the pipeline, improving material utilization and construction continuity; combined with the axially unevenly distributed through holes on the fixed plate, the water glass forms multiple jets at different angles that cross-flow and converge with the baking soda solution, achieving preliminary and efficient mixing. Then, the axially arranged rotatable blades inside the mixing tube form dynamic shearing and stirring, enhancing the turbulence effect and overcoming the stratification problem caused by the viscosity difference between the two materials, completing thorough mixing within a short distance, balancing the immediacy of preparation and use with mixing uniformity; the conical nozzle focuses the mixed slurry into a high-speed jet, which... The enhanced shear mixing before grouting improves penetration into deeper leak points, ensuring optimal flow and reaction of the grout upon contact, thus optimizing the sealing effect. The combination of a proportional valve and a flushing pump allows for flushing of residual grout in the pipeline during construction breaks, preventing solidification and blockage. It also allows for adjustment of water glass concentration, ensuring long-term reliable operation. The dual-pump redundancy design enables automatic fault switching and a wide flow range, ensuring continuous material supply to meet the needs of different leak sizes. The first and second flow control valves can independently and precisely adjust the delivery rate of the two materials, dynamically adjusting the ratio based on real-time conditions such as leak size and seepage rate. This avoids the limitations of fixed ratios in premixed mode, improving the adaptability of the sealing effect. Overall, through the synergistic effect of all structures, the efficiency, safety, and reliability of coal mine leak sealing construction are comprehensively improved. Attached Figure Description

[0015] To more clearly illustrate the technical solution of this patent, the drawings used in the description will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this patent. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0016] Figure 1 This is a structural schematic diagram of a specific embodiment of the present utility model.

[0017] Figure 2 This is a schematic diagram of the infusion tube in a specific embodiment of the present invention.

[0018] Figure 3 This is a schematic diagram of the nozzle structure in a specific embodiment of the present invention.

[0019] Figure 4 This is a schematic diagram of the structure of the fixing plate in a specific embodiment of this utility model.

[0020] Explanation of main figure symbols 01. Infusion tubing, 02. Nozzle, 1. Inner tube, 2. Sleeve, 3. Fixing plate, 4. Through hole, 5. Nozzle, 6. Mixing tube, 7. Paddle, 8. Baking soda solution supply pump, 9. Water glass supply pump, 10. Proportional valve, 11. Flushing water pump, 12. First tee, 13. Second tee, 14. First flow control valve, 15. Second flow control valve, 16. Cage. Detailed Implementation

[0021] To make the objectives, features, and advantages of this patent more apparent and understandable, the technical solutions of this patent will be clearly and completely described below with reference to the accompanying drawings of the specific embodiments. Obviously, the embodiments described below are only some embodiments of this patent, and not all embodiments. Based on the embodiments of this patent, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this patent.

[0022] like Figure 1-3 As shown, a coal mine leak-sealing liquid preparation device includes a liquid delivery pipe 01 and a nozzle 02: The infusion tube 01 includes an inner tube 1 and a sleeve 2. The sleeve 2 is fitted over the inner tube 1. One end of the sleeve 2 is connected to the nozzle 02. A fixing plate 3, which is annular, is provided at this end of the sleeve 2. The outer edge of the fixing plate 3 is fixed to the inner wall of the sleeve 2. One end of the inner tube 1 is fixedly connected to the inner hole of the fixing plate 3. The other end of the inner tube 1 extends through the wall of the sleeve 2 and is connected to a sodium bicarbonate solution supply pump 8. The other end of the sleeve 2 is connected to... A water glass supply pump 9 is provided. In this embodiment, two sodium bicarbonate solution supply pumps 8 are provided, and the two sodium bicarbonate solution supply pumps 8 are connected to the sleeve 2 through a first tee 12; two water glass supply pumps 9 are provided, and the two water glass supply pumps 9 are connected to the inner tube 1 through a second tee 13; a first flow control valve 14 is provided between the sodium bicarbonate solution supply pump 8 and the inner tube 1, and a second flow control valve 15 is provided between the water glass supply pump 9 and the sleeve 2.

[0023] The fixing plate 3 has multiple through holes 4, and as shown in the figure Figure 4As shown, on the fixed plate 3, a plurality of through holes 4 are unevenly distributed in the axial direction. A nozzle 5 is provided at one end of the nozzle 02 away from the infusion tube 01. The nozzle 5 is a conical nozzle. The nozzle 02 includes a mixing tube 6. One end of the mixing tube 6 is connected to the infusion tube 01. The nozzle 5 is located at the other end of the mixing tube 6. A turbulence shroud assembly is provided inside the mixing tube 6. In this embodiment, the turbulence shroud assembly includes a plurality of blades 7. A retainer 16 is installed inside the mixing tube 6. The blades 7 are rotatably mounted on the retainer 16, and the plurality of blades 7 are arranged along the axial direction of the mixing tube 6. Furthermore, a proportional valve 10 is provided at one end of the sleeve 2 away from the nozzle 02. The first inlet of the proportional valve 10 is connected to the water glass supply pump 9, and the second inlet of the proportional valve 10 is connected to the flushing water pump 11.

[0024] The working process of this utility model is as follows: First, the sodium bicarbonate solution supply pump and the water glass supply pump are started. The sodium bicarbonate solution is delivered separately through the inner tube, and the water glass is delivered separately through the casing. The delivery volume of the two materials is adjusted by the first and second flow control valves respectively to precisely control the mixing ratio. Then, when the two materials are delivered to the connection end between the delivery pipe and the nozzle, the water glass forms multiple jets through multiple unevenly distributed axial holes on the fixed plate, which initially converge and turbulently mix with the sodium bicarbonate solution output from the inner tube at the fixed plate. Subsequently, the mixed slurry enters the mixing tube of the nozzle, where it is dynamically sheared and stirred by the axially arranged rotating blades, achieving thorough and uniform mixing. Finally, the uniformly mixed slurry is focused into a high-speed jet through the conical nozzle and sprayed directly onto the leak point. During construction breaks or after completion, the proportioning valve is switched to the flushing water pump to flush out residual slurry into the casing and mixing tube with clean water to prevent solidification and blockage.

[0025] As can be seen from the above embodiments, the advantages of this utility model are as follows: This device enables the on-site preparation and use of baking soda solution and water glass. Through the independent dual-cavity delivery structure of the inner tube and the outer sleeve, it avoids the premature mixing and solidification of the two materials from the source, completely solving the pipeline blockage problem of traditional premixing methods, and improving material utilization and construction continuity. The staged mixing design ensures uniform slurry mixing, overcoming the stratification problem caused by viscosity differences, and adapting to rapid mixing requirements. The flow control valve and dual-pump redundant system can accurately adjust the ratio and ensure continuous supply, flexibly adapting to different leak sizes and working conditions. The conical nozzle enhances jet penetration and improves the leak-sealing effect. The matching flushing system can promptly clean residual slurry, preventing solidification and blockage, and extending the device's lifespan. Overall, through structural synergy, it balances the immediacy of mixing, precise ratio, construction reliability, and scenario adaptability, significantly improving the efficiency and safety of leak sealing in coal mines.

[0026] The above description of the disclosed embodiments enables those skilled in the art to implement or use this patent. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of this patent. Therefore, this patent is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A coal mine leak-sealing liquid preparation device, comprising a liquid delivery pipe (01) and a nozzle (02), characterized in that: The infusion tube (01) includes an inner tube (1) and a sleeve (2). The sleeve (2) is sleeved on the outside of the inner tube (1). One end of the sleeve (2) is connected to the nozzle (02). The sleeve (2) is provided with a fixing plate (3) at this end. The fixing plate (3) is annular. The outer edge of the fixing plate (3) is fixed to the inner wall of the sleeve (2). One end of the inner tube (1) is fixedly connected to the inner hole of the fixing plate (3). The fixing plate (3) is provided with multiple through holes (4). The nozzle (5) is provided at the end of the nozzle (02) away from the infusion tube (01). The other end of the inner tube (1) passes through the wall of the sleeve (2) and is connected to a sodium bicarbonate solution supply pump (8). The other end of the sleeve (2) is connected to a water glass supply pump (9).

2. The coal mine plugging and liquid preparation device according to claim 1, characterized in that, The nozzle (02) includes a mixing tube (6), one end of which is connected to the infusion tube (01), and the nozzle (5) is disposed at the other end of the mixing tube (6). The mixing tube (6) is provided with a flow turbulence component inside.

3. The coal mine plugging and liquid preparation device according to claim 2, characterized in that, The turbulence assembly includes multiple blades (7), a retainer (16) is installed inside the mixing tube (6), the blades (7) are rotatably mounted on the retainer (16), and the multiple blades (7) are arranged along the axial direction of the mixing tube (6).

4. The coal mine plugging and liquid preparation device according to claim 3, characterized in that, The nozzle (5) is a conical nozzle.

5. The coal mine plugging and liquid preparation device according to claim 1, characterized in that, On the fixed plate (3), the plurality of through holes (4) are unevenly distributed in the axial direction.

6. The coal mine plugging and liquid preparation device according to claim 1, characterized in that, A proportional valve (10) is provided at one end of the sleeve (2) away from the nozzle (02). The first inlet of the proportional valve (10) is connected to the water glass supply pump (9), and the second inlet of the proportional valve (10) is connected to the flushing water pump (11).

7. The coal mine plugging and liquid preparation device according to claim 1, characterized in that, Two sodium bicarbonate solution supply pumps (8) are provided, and the two sodium bicarbonate solution supply pumps (8) are connected to the sleeve (2) through the first tee (12); two water glass supply pumps (9) are provided, and the two water glass supply pumps (9) are connected to the inner tube (1) through the second tee (13).

8. The coal mine plugging and liquid preparation device according to claim 1, characterized in that, A first flow control valve (14) is provided between the sodium bicarbonate solution supply pump (8) and the inner tube (1), and a second flow control valve (15) is provided between the water glass supply pump (9) and the sleeve (2).

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