Pipe conveying buffer device for underground mine tailings filling

Abstract

The application discloses a pipeline conveying buffer device for underground mine tailing filling, which comprises a main conveying pipe (1), a flow guide tongue plate (2), a buffer ring pipe, an air reservoir (4) and a mixing cavity (6). The buffer ring pipe is formed into an integral tubular structure by a buffer inclined pipe (3.1) and a ring-shaped return pipe (3.2). The inlet of the buffer inclined pipe (3.1) is obliquely communicated with the front end inlet section of the main conveying pipe (1) in the slurry flow direction. The outlet of the ring-shaped return pipe (3.2) is communicated with the rear end outlet section of the main conveying pipe (1) in the slurry flow direction and forms a backflush loop. The intersection of the rear end outlet section of the main conveying pipe (1) in the slurry flow direction and the outlet of the ring-shaped return pipe (3.2) is the mixing cavity (6). The air reservoir (4) is located at the upper part of the intersection of the buffer inclined pipe (3.1) and the ring-shaped return pipe (3.2). The application is used for buffering slurry in the high-concentration filling process, preventing blockage and abrasion, and has the advantages of compact structure, convenient processing and installation, no any movable mechanical mechanism in the filling buffer process and greatly increased service life.

Description

Technical Field

[0001] This invention pertains to slurry transport buffer devices, and particularly relates to pipeline transport buffer devices for high-concentration tailings backfilling in underground mines. Background Technology

[0002] Backfilling mining is a commonly used method in underground mining, offering advantages such as safety, efficiency, economy, and environmental friendliness, and is considered the mainstream direction for future underground mining. The most important process in backfilling mining is wet slurry preparation, which utilizes sand bins or thickeners to thicken and settle tailings slurry from the concentrator, releasing it as underflow when a certain concentration is reached. In recent years, with the significant development of deep cone thickening technology, the concentration of backfill slurry has become increasingly higher, reaching 65%–70% or more, and even including backfilling with concrete-like aggregates.

[0003] In existing filling technologies, vertical filling pipelines often reach depths of hundreds of meters. During material transport, the immense vertical pressure creates a "hammering effect," causing clogged material to be expelled by the enormous gas pressure, resulting in a pulsed jet of material. Existing buffering devices cannot effectively address this problem. Previously, buffering the slurry was achieved by adjusting the opening of electric valves, but this method suffers from significant wear and cannot promptly restore the pipe diameter, leading to numerous drawbacks. Therefore, inventing a device for buffering the slurry within the filling pipeline is an urgent need in current filling technology. Summary of the Invention

[0004] The purpose of this invention is to address the problems of existing technologies, such as easy blockage and pipe wear caused by high-concentration slurry, and the generation of pulse jets. It provides an adaptive, mechanically independent, safe, and reliable pipeline conveying buffer device for underground mine tailings backfilling, used to buffer the slurry during high-concentration backfilling to prevent blockage and wear. This pipeline conveying buffer device can adjust the pressure of the conveying pipe to ensure uniform material distribution and reduce the impact of pulse jets. Simultaneously, the device can promptly return to its initial state to prepare for the next material impact.

[0005] To achieve the above-mentioned objectives of the present invention, the present invention provides a pipeline conveying and buffering device for backfilling tailings in underground mines, which adopts the following technical solution:

[0006] This invention discloses a pipeline conveying and buffering device for tailings backfilling in underground mines, comprising a main conveying pipe. Its features include: a guide tongue plate, a buffer ring pipe, a gas reservoir, and a mixing chamber. The buffer ring pipe is an integral tubular structure formed by connecting a buffer inclined pipe and a ring-shaped return pipe. The inlet of the buffer inclined pipe is obliquely connected and welded to the front inlet section of the main conveying pipe in the direction of slurry flow. The outlet of the ring-shaped return pipe is welded and connected to the rear outlet section of the main conveying pipe in the direction of slurry flow, forming a backflow loop that self-countersacts and provides a buffering effect. The guide tongue plate is located below the buffer inclined pipe and welded to the intersecting notch above the main conveying pipe. The rear outlet section of the main conveying pipe in the direction of slurry flow is connected to the ring-shaped return pipe. The intersection of the outlets of the loop return pipes forms a mixing chamber; the gas reservoir is located above the intersection of the buffer inclined pipe and the loop return pipe, precisely at the top of the entire device, thus preventing slurry from entering and solidifying; the gas reservoir is a closed cavity structure with a larger upper section and a smaller lower section, and its lower inlet is connected to the buffer loop pipe; the angle of inclination between the buffer inclined pipe and the front end of the main delivery pipe is α, 20° < α < 30°, and the angle of inclination between the outlet section of the loop return pipe and the rear outlet section of the main delivery pipe in the direction of slurry flow is β, 40° < β < 60°; the diameter DN2 of the buffer loop pipe should not be greater than the diameter DN1 of the main delivery pipe, and should not be less than half the diameter DN1 of the main delivery pipe.

[0007] Flanges are welded at both the front and rear ends of the main conveying pipe to facilitate connection with the tailings backfilling and conveying pipeline.

[0008] As a preferred embodiment of the present invention, the oblique angle β between the outlet section of the annular return pipe and the rear outlet section of the main conveying pipe in the direction of slurry flow is preferably 50° < β < 60°. Within this angle range, the anti-flushing, mixing, and conveying effects are optimal.

[0009] Studies have shown that the radius R1 of the ring-shaped return pipe should be 2 to 3 times the diameter DN1 of the main delivery pipe, i.e.: R1 = (2 to 3) × DN1.

[0010] The pipeline conveying and buffering device for backfilling tailings in underground mines, as described in this invention, has the following beneficial effects after adopting the above-mentioned technical solution:

[0011] (1) The main conveying pipe of the present invention is used as the slurry channel during turbulent flow, the buffer ring pipe is used as the backflush circuit of pulse slurry, the mixing chamber is used as the mixing space for backflush slurry and normal transport slurry; the gas reservoir is used for the material that rushes out of the buffer ring pipe after the buffer device has been activated, and the guide tongue can control the amount of backflush material by adjusting its length according to the material's motion characteristics, thereby buffering the material's conveying speed.

[0012] (2) By controlling the movement direction of the material in the buffer ring tube, the present invention counteracts the original movement trajectory of the material, and the movement of the impact slurry is opposite to that of the slurry in the buffer cavity, thus counteracting it and generating a buffering effect. It can adapt to different material characteristics, material pressure and automatically restore the initial buffer state.

[0013] (3) The present invention is designed with a gas storage device. After the first impact buffer is completed, the compressed gas in the gas storage device will discharge the slurry out of the buffer ring pipe to prevent the slurry from staying in the buffer ring pipe and causing the device to be blocked.

[0014] (4) The overall structure of the present invention is ingeniously designed and easy to process and install; there are no moving mechanical mechanisms during the filling and buffering process, which greatly increases the service life. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the structure of a pipeline conveying and buffering device for backfilling tailings in an underground mine, according to the present invention.

[0016] The attached diagram is labeled as follows: 1-Main delivery pipe; 2-Guide tongue plate; 3.1-Buffer inclined pipe; 3.2-Annular return pipe; 4-Gas reservoir; 5-Flange; 6-Mixing chamber. Detailed Implementation

[0017] To further describe the present invention, a pipeline conveying and buffering device for backfilling tailings in underground mines according to the present invention will be described in more detail below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0018] Depend on Figure 1The schematic diagram of the structure of the pipeline conveying and buffering device for tailings backfilling in underground mines, as shown in the present invention, indicates that the device comprises a main conveying pipe 1, a guide tongue plate 2, a buffer ring pipe, a gas reservoir 4, a flange 5, and a mixing chamber 6. The flange 5 is welded to the front and rear ends of the main conveying pipe 1. The buffer ring pipe is an integral tubular structure formed by connecting a buffer inclined pipe 3.1 and a ring-shaped return pipe 3.2. The inlet of the buffer inclined pipe 3.1 is obliquely connected to the front inlet section of the main conveying pipe 1 in the direction of slurry flow, and the outlet of the ring-shaped return pipe 3.2 is connected to the rear outlet section of the main conveying pipe 1 in the direction of slurry flow, forming a backflow loop. The guide tongue plate 2 is located inside and below the buffer inclined pipe 3.1 and is connected to the main conveying pipe... The intersecting notch at the top of the main conveying pipe 1 is welded; the intersection of the rear outlet section of the slurry flow direction of the main conveying pipe 1 and the outlet of the annular return pipe 3.2 forms the mixing chamber 6; the gas reservoir 4 is located above the intersection of the buffer inclined pipe 3.1 and the annular return pipe 3.2. The gas reservoir 4 is a closed cavity structure with a larger upper part and a smaller lower part. The lower inlet of the gas reservoir 4 is connected to the buffer annular pipe; the oblique angle between the buffer inclined pipe 3.1 and the front end of the main conveying pipe 1 is α, 20° < α < 30°, and the oblique angle between the outlet section of the annular return pipe 3.2 and the rear outlet section of the slurry flow direction of the main conveying pipe 1 is β, 40° < β < 60°. This special oblique design allows the buffer annular pipe to absorb the impact force from the conveying pipe to the maximum extent, while reducing the kinetic energy loss of the impacting slurry.

[0019] After a series of fluid dynamics simulation experiments, it was found that the diameter DN2 of the buffer ring pipe has a clear size limit on the diameter DN1 of the main delivery pipe 1. The diameter DN2 of the buffer ring pipe should not be greater than the diameter DN1 of the main delivery pipe 1, and should not be less than half of the diameter DN1 of the main delivery pipe 1. If DN2 is too large, the buffer ring pipe will not be able to fully absorb the impact slurry, while if DN2 is too small, the buffering effect of the impact slurry will be greatly reduced.

[0020] Furthermore, and more importantly, there is an optimal range for the radius R1 of the buffer ring pipe 3. The radius R1 of the ring return pipe 3.2 is 2 to 3 times the diameter DN1 of the main delivery pipe 1, that is: R1 = (2 to 3) × DN1. If R1 is too large, the flushing slurry will not be able to impact the fluid in the main pipeline in time. If R1 is too small, the kinetic energy loss of the flushing will be too large, and the flushing effect will not be fully utilized.

[0021] There are no specific requirements for the length L of the guide tongue 2. The main functions of the guide tongue 2 are airflow guidance and impact resistance. Its length L can be adjusted appropriately according to the actual application scenario to optimize the overall buffering effect.

[0022] In practical engineering applications, this invention first selects a suitable pipe diameter, number of pipes connected in series, and placement location based on actual production needs. Then, the buffer device is placed horizontally at the location of the pressure-reducing and buffering filling pipeline, with one side of the buffer ring pipe device arranged vertically upwards. Finally, the buffer device is connected to the main tailings filling pipeline via flange 5. During the filling process, the filling state of the buffer ring pipe is determined by the balance between the impact pressure and the gas pressure in the gas storage tank. The impact pressure compresses the gas in the gas storage tank 4, and the slurry fills the buffer ring pipe and is guided to the mixing chamber 6 through the annular return pipe 3.2, where it counteracts the impacting slurry, thus buffering the slurry's movement speed and achieving uniform material transport and buffering.

[0023] This invention effectively prevents pulse jets from occurring when high-pressure filling mortar enters the horizontal pipe from the vertical pipe by adding a buffer mechanism, greatly improving the stability of the conveying process and reducing problems caused by impact wear on the pipeline.

[0024] Engineering application results show that the structure designed in this invention is ingenious, easy to process and install, and after one impact buffering operation, the compressed gas in the gas tank discharges the slurry from the buffer ring, preventing the slurry from remaining in the buffer ring and causing blockage. There are no moving mechanical mechanisms during the filling process, greatly increasing the service life. By using the mine filling buffer device of this invention, pulse jets can be effectively prevented when high-pressure filling mortar enters the horizontal pipe from the vertical pipe, greatly improving the stability of the conveying process and reducing problems caused by pipeline impact wear.

[0025] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from its spirit or essential characteristics. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the present invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

Claims

1. A pipeline conveying and buffering device for backfilling tailings in underground mines, comprising a main conveying pipe (1), characterized in that: It also includes a guide tongue plate (2), a buffer ring pipe, an air reservoir (4), and a mixing chamber (6). The buffer ring pipe is an integral tubular structure formed by connecting a buffer inclined pipe (3.1) and an annular return pipe (3.2). The inlet of the buffer inclined pipe (3.1) is obliquely connected to the front inlet section of the slurry flow direction of the main conveying pipe (1), and the outlet of the annular return pipe (3.2) is connected to the rear outlet section of the slurry flow direction of the main conveying pipe (1) to form a backflow circuit. The guide tongue plate (2) is located at... The buffer inclined tube (3.1) is welded to the intersecting notch at the bottom and the top of the main delivery tube (1); the intersection of the rear outlet section of the slurry flow direction of the main delivery tube (1) and the outlet of the annular return tube (3.2) forms a mixing chamber (6); the gas reservoir (4) is located at the upper part of the intersection of the buffer inclined tube (3.1) and the annular return tube (3.2), and the gas reservoir (4) is a closed cavity structure with a larger upper part and a smaller lower part. The lower inlet of the gas reservoir (4) is connected to the buffer annular tube; the buffer inclined tube ( 3.1) The oblique angle between the front end of the main conveying pipe (1) and the rear end of the main conveying pipe (1) is α, 20° < α < 30°; the oblique angle between the outlet section of the annular return pipe (3.2) and the rear end outlet section of the slurry flow direction of the main conveying pipe (1) is β, 40° < β < 60°; the diameter DN2 of the buffer ring pipe should not be greater than the diameter DN1 of the main conveying pipe (1), and not less than half the diameter DN1 of the main conveying pipe (1); the radius R1 of the annular return pipe (3.2) is the diameter of the main conveying pipe (1) 2 to 3 times the diameter DN1, i.e.: R1 = (2 to 3) × DN1; the main conveying pipe (1) is used for the slurry channel during turbulent flow; the buffer ring pipe is used for the backflush circuit of the pulse slurry; the mixing chamber (6) is used for the mixing space of the backflush slurry and the normal transport slurry; the gas storage device (4) is used for the material that rushes out of the buffer ring pipe after the buffer device has acted. After one impact buffer is completed, the slurry is discharged from the buffer ring pipe through the compressed gas inside, preventing the slurry from staying in the buffer ring pipe and causing the device to be blocked; The guide tongue (2) is used to adjust the amount of backwash material according to the material movement characteristics and buffer the slurry conveying speed; the main conveying pipe (1) is used to convey the turbulent filling slurry. The main conveying pipe (1) is placed horizontally and connected to the external tailings filling and conveying pipeline through the flange (5). The gas storage device (4) is arranged vertically upward on one side.

2. The pipeline conveying and buffering device for backfilling tailings in underground mines as described in claim 1, characterized in that: Flanges (5) are welded to the front and rear ends of the main delivery pipe (1).

3. The pipeline conveying and buffering device for backfilling tailings in underground mines as described in claim 1, characterized in that: 50°＜β＜60°。

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