A high-concentration coal gangue slurry pipeline tail end unpowered dilution device

Abstract

The utility model discloses a high concentration coal gangue material slurry pipeline tail end unpowered diluting device, including tail end conveying filling pipeline, grouting pipeline, tangential water injection pipe, the tail end conveying filling pipeline is equipped with a plurality of coaxial series stirring vane along the axial direction in, and at least includes a clockwise stirring vane, a counterclockwise stirring vane, and slurry drives stirring vane rotation when flowing through stirring vane, to make stirring vane agitates slurry, tangential water injection pipe one end is connected with water source, and the other end is connected with along the outer wall tangential of tail end conveying filling pipeline, and is close to the setting of slurry pipeline. The utility model discloses through slurry flow to drive stirring vane rotation, cooperation tangential water adding, makes high concentration coal gangue material slurry and pressurized water fast mixing even, effectively gives consideration to the excellent conveying characteristic of high concentration material slurry and the ideal filling diffusion performance of low concentration material slurry, ensures not to block the pipe, safe conveying while, and the filling efficiency of mined -out area has been improved greatly.

Description

Technical Field

[0001] This utility model belongs to the field of coal gangue slurry treatment technology, specifically, it relates to a non-powered dilution device at the tail end of a high-concentration coal gangue slurry pipeline. Background Technology

[0002] Coal is my country's primary energy source, playing a strategic role in ensuring the security and stability of the national power supply and supporting economic and social development. However, coal mining generates a large amount of solid waste such as coal gangue, which, if stored for a long time, can pollute the soil, water, and atmosphere. Meanwhile, coal gangue can also be used as a backfill material in mine backfilling. In actual backfilling operations, high-concentration coal gangue slurry, due to its lower pipeline flow velocity, helps reduce pipeline wear. However, when used for grouting in the caving zone of a goaf, it suffers from a large gravity slope and a small diffusion range, resulting in low grouting volume per hole and low coal gangue processing efficiency. In contrast, low-concentration coal gangue slurry exhibits excellent diffusion performance in the caving zone of a goaf, allowing for large grouting volume per hole and high coal gangue processing capacity and efficiency. However, during pipeline transportation, particles tend to settle, easily leading to pipeline blockage.

[0003] Therefore, there is an urgent need to develop a device that can combine the advantages of high-concentration slurry in pipeline transportation with the advantages of low-concentration slurry in grouting and filling, so as to achieve efficient and environmentally friendly large-scale disposal of coal gangue. Utility Model Content

[0004] The technical problem to be solved by this utility model is to overcome the shortcomings of the existing technology and provide a non-powered dilution device for the tail end of a high-concentration coal gangue slurry pipeline. To solve the above technical problem, the basic concept of the technical solution adopted by this utility model is as follows: A non-powered dilution device for the tail end of a high-concentration coal gangue slurry pipeline includes a tail-end conveying and filling pipeline, a grouting pipeline, and a tangential water injection pipe. One end of the tail-end conveying and filling pipeline is connected to a slurry conveying pipeline for conveying coal gangue slurry, and the other end is connected to a grouting pipeline for filling and pouring. Several coaxially connected stirring blades are arranged in series inside the tail-end conveying and filling pipeline, including at least one clockwise stirring blade and one counterclockwise stirring blade. The tail ends of the stirring blades do not contact the inner wall of the pipeline. The stirring blades are mounted on a blade fixing shaft by bearings. The blade fixing shaft is fixedly connected to the tail-end conveying and filling pipeline by a support frame. When the slurry flows through the stirring blades, it drives the stirring blades to rotate, so that the stirring blades agitate the slurry. One end of the tangential water injection pipe is connected to a water source, and the other end is tangentially connected to the outer wall of the tail-end conveying and filling pipeline and is set close to the slurry conveying pipeline.

[0005] Furthermore, there are four stirring blades, which are coaxially connected in series: clockwise spiral stirring blade one, clockwise spiral stirring blade two, counterclockwise spiral stirring blade one, and counterclockwise spiral stirring blade two. The installation angle of clockwise spiral stirring blade one is 30°, the installation angle of clockwise spiral stirring blade two is 15°, the installation angle of counterclockwise spiral stirring blade one is 15°, and the installation angle of counterclockwise spiral stirring blade two is 30°.

[0006] Furthermore, the inner wall of the tail-end conveying and filling pipe is provided with several baffles, which are semi-circular rings. The baffles are perpendicularly connected to the inner wall of the pipe or inclined towards the direction of slurry flow. The baffles are arranged between two stirring blades, and the projections of two adjacent baffles along the axial direction of the pipe do not overlap.

[0007] Furthermore, a pressurized water pump, a water storage tank, a water pump, and a water pumping pipe are connected in series between the tangential water injection pipe and the water source. The water pump transports water from the water source to the water storage tank through the water pumping pipe. The water source is a water collection well.

[0008] Furthermore, the outer wall of the stirring blade is coated with a wear-resistant coating.

[0009] By adopting the above technical solution, this utility model has the following beneficial effects compared with the prior art.

[0010] 1. By performing immediate and controllable dilution at the end of the conveying pipeline, the advantages of high-concentration slurry ("low wear during pipeline transport") and low-concentration slurry ("good diffusion in goaf areas") are creatively combined, fundamentally solving the technical contradiction that a single-concentration slurry cannot simultaneously achieve both conveying and filling performance.

[0011] 2. The core stirring blade assembly of the device is driven by the flowing slurry itself, without the need for an external power supply or motor, realizing true "powerless" automatic stirring, which greatly reduces the energy consumption and operating costs of the equipment, and is especially suitable for use in energy-constrained mining environments.

[0012] 3. The design incorporates a multi-stage spiral blade combination with clockwise and counterclockwise rotations and different installation angles, combined with the swirling flow formed by tangential water injection. This generates multi-dimensional and intense shearing and mixing effects on the slurry. The inner wall baffle further enhances the mixing efficiency, ensuring uniform mixing of water and slurry in a short time and effectively preventing the risks of particle settling and pipe blockage.

[0013] 4. The dilution concentration can be flexibly adjusted according to the filling requirements, making it highly versatile and valuable for widespread application.

[0014] The specific embodiments of this utility model will be described in further detail below with reference to the accompanying drawings. Attached Figure Description

[0015] The accompanying drawings, which form part of this application, are used to provide a further understanding of the present invention. The illustrative embodiments and descriptions of the present invention are used to explain the present invention, but do not constitute an undue limitation of the present invention. Obviously, the drawings described below are merely some embodiments; those skilled in the art can obtain other drawings based on these drawings without creative effort. In the drawings: Figure 1 This is a schematic diagram of the overall structure connection of an embodiment of the present invention; Figure 2 This is a schematic diagram of a conveying and filling pipeline structure according to an embodiment of the present invention; Figure 3 This is a side view of a conveying and filling pipeline according to an embodiment of the present invention; Figure 4 This is a schematic diagram of the installation of the stirring blades according to an embodiment of the present invention.

[0016] In the diagram: 1-Conveying and filling pipeline, 2-Tangential water injection pipe, 3-Pressurizing water pump, 4-Water storage tank, 5-Water pump, 6-Water pumping pipeline, 7-Water collection well, 8-Grouting pipeline, 9-Clockwise spiral mixing blade one, 10-Clockwise spiral mixing blade two, 11-Counterclockwise spiral mixing blade one, 12-Counterclockwise spiral mixing blade two, 13-Blade fixing shaft, 14-Bearing, 15-Baffle plate, 16-Axial positioning shoulder, 17-Bearing seat retaining sleeve.

[0017] It should be noted that these accompanying drawings and textual descriptions are not intended to limit the scope of the present invention in any way, but rather to illustrate the concept of the present invention to those skilled in the art by referring to specific embodiments. Detailed Implementation

[0018] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions in the embodiments will be clearly and completely described below with reference to the accompanying drawings. The following embodiments are used to illustrate this utility model, but are not intended to limit the scope of this utility model.

[0019] In the description of this utility model, it should be noted that the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "inner", and "outer" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0020] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances. Example 1

[0021] like Figure 1-4 As shown in the figure, this embodiment describes a non-powered dilution device for the tail end of a high-concentration coal gangue slurry pipeline. This device mainly includes a tail-end conveying and filling pipeline 1, a grouting pipeline 8, and a tangential water injection pipe 2. (See attached figure.) Figure 1 As shown, the left end of the tail-end conveying and filling pipe 1 is connected to the slurry conveying pipe for conveying high-concentration coal gangue slurry, and its right end is connected to the grouting pipe 8 for filling and pouring deep into the goaf caving zone. Inside the tail-end conveying and filling pipe 1, a blade fixing shaft 13 is fixedly installed along its axial direction by a support frame.

[0022] Four stirring blades are coaxially connected in series on the blade fixing shaft 13 via bearings 14, allowing the blades to rotate freely as the slurry flows through. These four blades, from left to right, are: clockwise spiral stirring blade 9 (installation angle 30°), clockwise spiral stirring blade 10 (installation angle 15°), counterclockwise spiral stirring blade 11 (installation angle 15°), and counterclockwise spiral stirring blade 12 (installation angle 30°). The installation angle of the stirring blades refers to the angle between the blade and the axis of rotation, which is common knowledge in the field. In this example, the length of the tail-end filling and conveying pipeline is 1.5m, and the above four blades are installed at 0.3m, 0.6m, 0.9m, and 1.2m respectively. The axial positioning of the bearing 14 can be achieved using the axial positioning shoulder 16 and the bearing seat retaining sleeve 17, which are common knowledge in the mechanical field and will not be elaborated further here. The mixing blades are driven to rotate by the impact of the slurry, requiring no additional power. During rotation, they generate a composite flow field of "axial thrust + radial swirling flow," with the counter-clockwise spiral blades also generating shear flow, disrupting the laminar flow of the slurry along the axial direction. The tail ends of the mixing blades do not contact the inner wall of the pipe; a 3-5mm gap is maintained between the edge of the blade tail and the inner wall, preventing jamming or excessive wear during mixing. The coverage area of ​​a single set of mixing blades is sufficient to cover more than 60% of the cross-sectional area of ​​the filling and conveying pipe at the tail end, ensuring no blind spots in mixing.

[0023] One end of the tangential water injection pipe 2 is connected to a water source, and the other end is tangentially connected to the outer wall of the tail-end conveying and filling pipe 1, with the connection point close to the inlet of the grout delivery pipe (see attached). Figure 1-3As shown in the diagram, in this example, the distance between the tangential water injection pipe 2 and the left end of the tail-end filling and delivery pipe is 0.1m. The pipeline between the tangential water injection pipe 2 and the water source is equipped with a pumping pipe 6, a pumping pump 5, a water storage tank 4, and a booster pump 3 connected in series. Figure 1 The connection relationship is shown. The booster pump 3 can flexibly adjust its output power according to the slurry pressure in the tail-end filling and conveying pipeline and the required injection pressure of the dilution water, ensuring that the dilution water has sufficient pressure to be injected into the pipeline tangentially. The pump 5 can adjust its output power according to the water storage requirements of the storage tank 4 and the water conveyance distance, ensuring a stable water supply to the storage tank 4. The preferred water source is the mine collection well 7, which is used to collect seepage water from filling the mine goaf and other areas of the mine, realizing the recycling and reuse of water resources. This systematic water supply design ensures a stable and continuous supply of dilution water and allows for precise control of the injection pressure and flow rate through the booster pump 3 according to actual working conditions.

[0024] On the inner wall of the tail-end conveying and filling pipe 1, a semi-circular baffle 15 is provided between every two stirring blades. In this example, three baffles are provided, see Appendix. Figure 2 Schematic diagram. These baffles 15 are connected perpendicularly to the inner wall of the pipe (or can be designed to be connected at an angle towards the slurry flow direction, as shown in the attached diagram). Figure 2 (Illustrative diagram), and the projections of two adjacent baffles 15 along the pipe axis do not overlap, combined with the attached... Figure 2 As shown, the installation positions of two adjacent baffles 15 are different, and because they are semi-circular rings, they can be staggered. In this example, the baffles 15 are welded to the inner wall of the pipe at a 30° angle. The plates are 8-10mm thick, and the edges are rounded to prevent slurry stagnation. They are used to break the slurry's flow inertia to improve mixing uniformity. The design of the baffles effectively disrupts the laminar flow state of the slurry, enhances the turbulence effect, and thus further improves the mixing uniformity of water and slurry.

[0025] The slurry conveying pipeline, the tail-end filling and conveying pipeline, and the grouting pipeline are all made of wear-resistant materials to adapt to the scouring and abrasion environment of high-concentration coal gangue slurry and extend the overall service life of the equipment. At the same time, all the outer walls of the mixing blades are coated with a wear-resistant coating to improve the wear resistance of the blades and extend the blade replacement cycle.

[0026] Working principle: High-concentration coal gangue slurry flows from the slurry delivery pipe into the tail-end conveying and filling pipe 1. The kinetic energy of the slurry flow drives the stirring blades to rotate around the axis. At the same time, pressurized water is injected into the pipe through the tangential water injection pipe 2. The tangential injection causes it to form a vortex in the pipe. The combined action of the rotating stirring blades and the swirling water effectively and uniformly dilutes the high-concentration slurry. The diluted slurry then flows into the grouting pipe 8 to fill the caving zone in the goaf.

[0027] This invention employs two sets of forward and reverse rotating blades. The difference in blade angle generates a composite flow field of "axial thrust + radial swirling flow" during rotation, enabling rapid and uniform mixing of high-concentration coal gangue slurry and pressurized water. Combined with the baffle plate 15, this enhances the turbulence effect and improves mixing efficiency. It effectively balances the excellent conveying characteristics of high-concentration slurry with the ideal filling and diffusion performance of low-concentration slurry, significantly improving the filling efficiency and diffusion range of the goaf while ensuring safe and unblocked transport.

[0028] The above description is merely a preferred embodiment of the present utility model and is not intended to limit the present utility model in any way. Although the present utility model has been disclosed above with reference to a preferred embodiment, it is not intended to limit the present utility model. Any person skilled in the art can make some modifications or alterations to the above-described technical content to create equivalent embodiments without departing from the scope of the present utility model. Any simple modifications, equivalent changes, and alterations made to the above embodiments based on the technical essence of the present utility model without departing from the scope of the present utility model shall still fall within the scope of the present utility model.

Claims

1. A non-powered dilution device for the tail end of a high-concentration coal gangue slurry pipeline, characterized in that, The system includes a tail-end conveying and filling pipe (1), a grouting pipe (8), and a tangential water injection pipe (2). One end of the tail-end conveying and filling pipe (1) is connected to the grouting pipe for conveying coal gangue slurry, and the other end is connected to the grouting pipe (8) for filling and casting. The tail-end conveying and filling pipe (1) has several coaxially connected stirring blades along the axial direction, including at least one clockwise stirring blade and one counterclockwise stirring blade. The tail end of the stirring blade does not contact the inner wall of the pipe. The stirring blade is mounted on the blade fixing shaft (13) through a bearing (14). The blade fixing shaft (13) is fixedly connected to the tail-end conveying and filling pipe (1) through a support frame. When the slurry flows through the stirring blade, it drives the stirring blade to rotate so that the stirring blade agitates the slurry. One end of the tangential water injection pipe (2) is connected to a water source, and the other end is tangentially connected to the outer wall of the tail-end conveying and filling pipe (1) and is set close to the grouting pipe.

2. The non-powered dilution device at the tail end of a high-concentration coal gangue slurry pipeline according to claim 1, characterized in that: The stirring blades are four in total, namely, clockwise spiral stirring blade one (9), clockwise spiral stirring blade two (10), counterclockwise spiral stirring blade one (11), and counterclockwise spiral stirring blade two (12) connected in series on the same axis. The installation angle of the clockwise spiral stirring blade one (9) is 30°, the installation angle of the clockwise spiral stirring blade two (10) is 15°, the installation angle of the counterclockwise spiral stirring blade one (11) is 15°, and the installation angle of the counterclockwise spiral stirring blade two (12) is 30°.

3. The non-powered dilution device at the tail end of a high-concentration coal gangue slurry pipeline according to claim 1, characterized in that: The inner wall of the tail end conveying and filling pipe (1) is provided with several baffles (15). The baffles (15) are semi-circular rings. The baffles (15) are vertically connected to the inner wall of the pipe or inclined towards the direction of slurry flow. The baffles (15) are set between two stirring blades, and the projections of two adjacent baffles (15) along the axial direction of the pipe do not overlap.

4. The non-powered dilution device at the tail end of a high-concentration coal gangue slurry pipeline according to claim 1, characterized in that: The tangential water injection pipe (2) is connected in series with a pressurized water pump (3), a water storage tank (4), a water pump (5), and a water pumping pipe (6). The water pump (5) transports water from the water source to the water storage tank (4) through the water pumping pipe (6). The water source is a water collection well (7).

5. The non-powered dilution device at the tail end of a high-concentration coal gangue slurry pipeline according to claim 1, characterized in that: The outer wall of the stirring blade is coated with a wear-resistant coating.

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