Identification and control mechanism of goaf backfill bleeding and mortar leakage in underground mine

Abstract

The application provides a kind of recognition and control mechanism of goaf backfill bleeding and mortar leakage in underground mine.The mechanism includes overflow bucket, electric switch butterfly valve, threaded joint, manual switch ball valve, bleeding pipeline, pressure transmitter, pressure instrument and control box.The bleeding pipeline is embedded in goaf isolation wall, one end is connected to bleeding pipeline network, and the other end is connected to bleeding output leakage.The manual switch ball valve is first connected to the bleeding pipeline to control the pipeline on-off.The electric switch butterfly valve is installed behind the manual switch ball valve, and the opening and closing of the butterfly valve is controlled by signal feedback.The threaded joint is installed between the electric switch butterfly valve and the manual switch ball valve.The application not only saves filling cost, avoids material waste and improves filling efficiency, but also avoids production safety accidents caused by mortar leakage to mine roadway, achieving the purpose of safe and efficient filling.

Description

Technical Field

[0001] This invention relates to the field of mining engineering technology, specifically to a mechanism for identifying and controlling backfilling water seepage and mortar leakage in underground mine goaf areas. Background Technology

[0002] Mining goaf areas require backfilling, typically using a mixture of mineral slurry and cement. The slurry is piped to the target area underground. The backfill contains a large amount of water, which needs to be drained after the backfill has settled in the goaf for a period of time. Traditionally, drainage is done manually using valves, with the turbidity of the water being manually assessed. If the water is relatively clear, the valve remains open; if it becomes turbid, the valve is closed immediately.

[0003] The drainage valve is located on the side wall of the underground backfill retaining wall. The installation area is dark and damp, with harsh working conditions, making it difficult for personnel to stay for long periods. During the drainage process, the water quality becomes turbid. If personnel do not detect it in time, slurry will leak, polluting the roadway and hindering ore mining, which will have an adverse impact on production operations. Summary of the Invention

[0004] The present invention aims to address the technical deficiencies of existing technologies by providing a mechanism for identifying and controlling backfilling water seepage and mortar leakage in underground mine goaf areas, thereby solving the technical problem that conventional methods cannot achieve automatic control.

[0005] To achieve the above technical objectives, the present invention adopts the following technical solution:

[0006] A mechanism for identifying and controlling backfill water leakage and mortar leakage in underground mine goaf areas includes an overflow tank, an electrically operated butterfly valve, a threaded joint, a manually operated ball valve, a water leakage pipeline, a pressure transmitter, a pressure gauge, and a control box. The water leakage pipeline is pre-embedded in the goaf isolation wall, with one end internally connected to the water leakage network and the other end externally discharging leakage. The manually operated ball valve is first connected to the water leakage pipeline to control the pipeline's on / off state, facilitating the installation and disassembly of subsequent components. The electrically operated butterfly valve is installed after the manually operated ball valve, controlling its opening and closing via signal feedback to prevent mortar leakage. A threaded joint is installed between the electrically operated butterfly valve and the manually operated ball valve, facilitating the connection between the electrically operated butterfly valve and the fixed water leakage pipeline.

[0007] Preferably, the top of the overflow tank is an L-shaped elbow, and the end is provided with a flange connected to an electric switch butterfly valve. The lower part of the overflow tank has a conical structure and a drain outlet at the bottom to facilitate the discharge of large particulate impurities in the secretions.

[0008] Preferably, the diameter of the bottom drain outlet is smaller than the diameter of the pipe inlet, so that the settled sand is discharged from the bottom and the light exudate that is not discharged in time overflows through the top of the overflow bucket, which facilitates the uniform mixing and consistent density of the exudate in the bucket.

[0009] Preferably, the side wall of the drainage tank has two interfaces for installing pressure transmitters. The pressure transmitters are installed on the wall of the drainage tank and the differential pressure is fed back to the pressure gauge through signal processing.

[0010] As a preferred option, the control components and control system inside the control box identify the turbidity of the effluent from the oozing pipe through signal feedback from the pressure transmitter and pressure gauge, and control the closing of the electric switch butterfly valve to achieve the purpose of preventing slurry leakage.

[0011] During the slurry process, the density of the slurry is detected and intelligently analyzed to determine the turbidity of the water. When the turbidity-corrected density is higher than the set threshold (preferred value 1.32 g / ml), it is considered that the current state is slurry running. The slurry running state continues until the set time (preferred, 90 seconds) is reached, and then the drain valve is automatically closed. After the valve is automatically closed due to the density exceeding the limit, it will automatically open again every set time (preferred value 4 hours) to determine whether there is clear water in the filling body. The program will automatically jump to the previous step until all the clear water in the filling body is discharged.

[0012] Turbidity varies depending on the materials and proportions of the filling material, which may consist of tailings slurry, cement, consolidation powder, coarse aggregate, flocculant, and water. To ensure the solidification quality of the filling material, water must be drained promptly. This invention calculates water turbidity based on measured density data. When flocculant dissolves in water, it affects parameters such as density, viscosity, and permeability. The required density of clarified water also varies depending on the cement content. The turbidity and density no longer exhibit a linear relationship, necessitating correction of the measured values ​​to obtain satisfactory results. Through repeated experiments at mining industrial sites, a turbidity-corrected density algorithm was developed.

[0013] H=K×(P2-P1) / (g×h) , (1)

[0014] In the formula, H is the turbidity-corrected density; K is the material ratio influence coefficient, and the value is taken from Table 1. P1 This is a high-level pressure measurement value; P2 is the low-pressure measurement value; g is the acceleration due to gravity; h is the vertical height difference between the centers of the two pressure sensors.

[0015] Table 1. Values ​​of K for commonly used cement-to-sand ratios and flocculant-to-sand ratios.

[0016]

[0017] The beneficial effects of this invention are:

[0018] This invention utilizes the pressure difference signal feedback from the pressure transmitters above and below the overflow tank wall. Based on the pressure difference generated by the secretions inside the tank and the composition of the filling material, the corrected density of the current secretions is calculated and analyzed. When a preset value is reached, it is determined that the secretions contain mortar, and the electric butterfly valve is promptly closed by the control system to prevent mortar leakage. After a preset time interval, the electric butterfly valve is automatically opened to determine whether there is clear water secreted from the filling material that meets the conditions. The program automatically jumps to the previous step until all the clear water in the filling material is discharged.

[0019] This method not only saves filling costs, avoids material waste, and improves filling efficiency, but also prevents production safety accidents caused by slurry leakage damaging mine roadways, achieving the goal of safe and efficient filling. Attached Figure Description

[0020] Figure 1 This is an isometric view illustrating the structure of the present invention;

[0021] Figure 2 This is a plan view and a partial sectional view of the present invention;

[0022] In the picture:

[0023] 1. Overflow tank 2. Electric butterfly valve 3. Threaded joint 4. Manual ball valve 5. Drainage pipe 6. Pressure transmitter 7. Pressure gauge 8. Control box. Detailed Implementation

[0024] The specific embodiments of the present invention will be described in detail below. To avoid excessive and unnecessary detail, well-known structures or functions will not be described in detail in the following embodiments. The approximate language used in the following embodiments is for quantitative purposes, indicating that a certain degree of variation in quantity is permissible without changing the basic function. Unless otherwise defined, the technical and scientific terms used in the following embodiments have the same meaning as commonly understood by those skilled in the art to which this invention pertains.

[0025] Figure 1 , Figure 2 This is a specific embodiment of the present invention, which is a mechanism for identifying and controlling backfilling water seepage and mortar leakage in underground mine goaf areas, such as... Figure 1 As shown, the mechanism includes 1. a support roller, 2. an overflow tank, 3. an electrically operated butterfly valve, 4. a threaded joint, 5. a manually operated ball valve, 6. a drainage pipe, 7. a pressure transmitter, 8. a pressure gauge, and 9. a control box. Each drainage pipe outlet is connected to a hardware module. After a goaf chamber is filled, the components after the joint can be disassembled via the threaded joint, allowing the entire module to be installed on the drainage pipes of other filled chambers, achieving reuse and saving operating costs.

[0026] like Figure 2 As shown, pressure transmitters are installed on the upper and lower sides of the overflow tank. These transmitters use the density differences of the secretions within the overflow tank to provide feedback on pressure differential changes, thereby reflecting the differences in the composition of the secretions. A drain outlet is located at the bottom of the overflow tank, and the water inlet at the top is lower than the upper edge of the tank. This ensures that the secretions are evenly mixed within the tank, improving the accuracy and sensitivity of detection and identification.

[0027] The specific implementation method of this embodiment is as follows: Electric butterfly valve, overflow tank, pressure transmitter, pressure gauge, and other components are connected to the drainage pipe equipped with a ball valve via threaded connections. When the ball valve and butterfly valve are opened and the drainage is water, the pressure gauge records the pressure difference output by the pressure transmitter above and below the overflow tank, using it as a reference parameter. Simultaneously, a safe fluctuation range for the pressure difference is set. When the composition of the drainage changes, resulting in a change in drainage concentration, the output pressure difference of the pressure transmitter fluctuates. If it exceeds the safe fluctuation range, it is determined that mortar has appeared in the drainage and the drainage pipe network is ruptured. The control system outputs a signal to close the electric butterfly valve, preventing further drainage and achieving the purpose of preventing slurry leakage. After a preset time interval, the electric butterfly valve is automatically opened to determine whether clear water has drained from the filling body. The program automatically jumps to the previous step until all clear water is drained from the filling body. This mechanism and control method not only saves filling costs and avoids material waste but also improves filling efficiency. This also avoids production safety accidents caused by slurry leakage damaging mine roadways, achieving the goal of safe and efficient backfilling. The embodiments of the present invention have been described in detail above, but the content described is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the scope of the present invention should be included within the protection scope of the present invention.

Claims

1. The underground mine goaf backfill bleeding and mortar leakage identification and control mechanism, including overflow bucket, electric switch butterfly valve, threaded hinge, manual switch ball valve, bleeding pipeline, pressure transmitter, pressure instrument, control box, characterized in that: The water discharge pipeline is embedded on the goaf isolation wall, one end of which is connected to the water discharge pipe network, and the other end is connected to the water discharge output; the manual switch ball valve is first connected to the water discharge pipeline to control the opening and closing of the pipeline; the electric switch butterfly valve is installed behind the manual switch ball valve to control the opening and closing of the butterfly valve through signal feedback; a threaded joint is installed between the electric switch butterfly valve and the manual switch ball valve; two interfaces for installing pressure transmitters are formed on the upper and lower sides of the water discharge bucket wall, the pressure transmitters are installed on the water discharge bucket wall, and the pressure difference is fed back to the pressure instrument through signal processing; the control box and the control system recognize the turbidity of the water discharge pipeline through the signal feedback of the pressure transmitters and the pressure instrument, and control the electric switch butterfly valve to be closed; Wherein, the turbidity correction density algorithm is: H=K×(P2-P1) / (g×h), (1) In the formula, H is the turbidity correction density; K is the material ratio influence coefficient; P1 is the high pressure measurement value; P2 is the low pressure measurement value; g is the acceleration of gravity; h is the vertical height difference between the centers of the two pressure sensors.

2. The mechanism for identifying and controlling the seepage and mortar leakage of the goaf backfilling in the underground mine according to claim 1, characterized in that, The top of the overflow bucket is an L-shaped elbow, the end is provided with a flange connected to the electric switch butterfly valve, the lower part of the overflow bucket is a conical structure, and the bottom is provided with a sewage outlet.

3. The mechanism for identifying and controlling seepage and mortar leakage in backfilling of goaf in underground mine according to claim 1, characterized in that, The diameter of the bottom sewage outlet is smaller than the diameter of the pipeline inlet, the accumulated sand is discharged from the bottom, and the light water discharge that is not timely removed overflows through the top of the overflow bucket.

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