Mining tailing paste filling pipeline conveying and stirring device

Abstract

The invention discloses a mine tailing paste filling pipeline conveying and stirring device, and belongs to the field of mine filling technologies and fluid conveying equipment. The device aims to solve the problems of solid-phase sedimentation and pipeline blockage which are easy to occur in pasty fluid pipeline transportation. The magnetic stirring unit is arranged in the filling pipeline (7), and the pipeline is sleeved with the magnetic field driving unit. The magnetic stirring unit consists of a stirring rotor (1), a spiral belt type paddle (2), a rolling bearing (3), a conical fairing (4) and a bearing seat (5); a permanent magnet is embedded in the stirring rotor (1), and the stirring rotor (1) is connected with the bearing (3) and the fairing (4) through threads. And the magnetic field driving unit comprises an electromagnetic coil group, an iron core (9), a coil protection shell (11) and a controller (10). Through the design of internal and external magnetic coupling driving, continuous online stirring without penetrating through a pipe wall dynamic seal is achieved, the structure is reliable, the maintenance requirement is low, and the uniformity and smoothness of paste conveying can be effectively guaranteed.

Description

Technical Field

[0001] This invention relates to the field of mine backfilling technology and fluid transport equipment, and in particular to a pipeline transport system for backfilling tailings paste in underground mines. Background Technology

[0002] Tailings paste backfilling technology is one of the core technologies for modern green mine construction. It involves preparing a paste-like slurry from tailings, cementing materials, and water, which is then pumped through pipelines to the underground goaf for backfilling. This technology has significant advantages in reducing tailings dam capacity, improving mine safety, and protecting the environment.

[0003] However, tailings paste, as a high-concentration, high-viscosity non-Newtonian fluid, is highly susceptible to solid particle sedimentation and slurry segregation during long-distance pipeline transportation, especially at low flow rates or during shutdown waiting periods. Solid particles gradually sink under gravity, leading to a seepage layer at the top of the pipeline and a high-concentration sediment layer at the bottom, significantly increasing pipeline resistance. More seriously, once the sediment layer thickens and solidifies, it can cause pipeline blockage. Handling blockages not only requires production shutdowns and consumes substantial manpower and resources for clearing, but may even trigger overpressure ruptures in localized sections of the pipeline, posing a safety risk.

[0004] Currently, the industry mainly employs techniques such as optimizing paste ratios and increasing flow rates, installing static mixers, and relying on external mixing tanks for transfer. While these methods can alleviate sedimentation and segregation issues during paste transportation to some extent, they all have significant limitations. Specifically, they cannot provide a reliable, efficient, and low-maintenance in-pipe mixing solution while ensuring continuous transportation. There is an urgent need in this field for a new type of in-pipe mixing device that can fundamentally overcome these shortcomings to ensure the safe, stable, and efficient long-term operation of the tailings paste filling system. Summary of the Invention

[0005] This invention addresses the problems of solid sedimentation, segregation, and pipeline blockage that easily occur when pastes are transported over long distances in existing technologies. It introduces the concepts of field effect and non-contact driven stirring to provide an internal pipeline stirring device that can achieve continuous online stirring without penetrating the pipe wall through dynamic sealing.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a long-distance pipeline conveying and mixing device for mine tailings paste filling, comprising a mixing rotor, with mixing blades on the outer wall of the mixing rotor, the mixing rotor being welded to the outer wall of the mixing blades, rolling bearings installed on both sides of the mixing rotor, specifically installed in the inner ring of the rolling bearings, the mixing rotor and the rolling bearings being connected by threads, a conical shunting cover installed at the end of the mixing rotor near the flow direction of the tailings paste, the mixing rotor and the conical shunting cover being connected by threads. The rolling bearings are integrally nested on the inner ring of the bearing seat, the outer ring of the bearing seat has an opening, and screws are fitted into the opening, the outer ring of the bearing seat being fixed to the inner wall of the filling pipeline by screws; an electromagnetic coil assembly is sleeved on the outer wall of the filling pipeline, the electromagnetic coil assembly is provided with a coil protective shell, the coil protective shell being fixed to the outer wall of the filling pipeline, and a controller is also installed on the outer wall of the filling pipeline, the controller being connected to the underground lighting circuit of the mine.

[0007] Preferably, the stirring rotor has spiral ribbon blades, and high-performance neodymium iron boron permanent magnets are embedded in the rotor body within a range of 0-50 cm near the end closest to the tailings flow direction. The blade diameter is approximately 1 / 3 of the filling pipe diameter. Threads are cut at both ends of the rotor. The thread length at the end closest to the tailings flow direction corresponds to the sum of the height of the rolling bearing and the depth of the threaded hole at the bottom of the conical shroud. The thread length at the end furthest from the tailings flow direction corresponds to the height of the rolling bearing. The thread fit elements at both ends are consistent.

[0008] Preferably, the rolling bearing has a double-sided sealing structure, and the inner ring is threaded to match the threads at both ends of the stirring rotor.

[0009] Preferably, the conical shroud is made of wear-resistant steel and is installed on the stirring rotor near the end of the tailings paste flow direction. The bottom diameter is the same as the outer ring diameter of the rolling bearing, and there is a machined threaded hole in the center of the bottom surface, which matches the thread of the stirring rotor.

[0010] Preferably, the bearing housing is a spoked disc structure made of wear-resistant steel, comprising two steel rings and three steel rods. The steel rings consist of an inner ring and an outer ring. The inner diameter of the inner ring is smaller than the maximum diameter of the rolling bearing, and the outer diameter of the outer ring is smaller than the inner diameter of the filling pipe. The outer ring has three holes, each at a 120° angle to the others, and the hole walls are threaded. The three steel rods also form a 120° angle with each other. One end of each steel rod is welded to the outer surface of the inner ring, and the other end is welded to the inner surface of the outer ring. The welding points are located between two adjacent holes.

[0011] Preferably, the electromagnetic coil assembly comprises six coils, each rectangular in shape and 50 cm in length, symmetrically distributed in space, with an angle of 60° between adjacent coils. The coil axis is perpendicular to the filling pipe axis, and the coil placement corresponds to the high-performance permanent magnet neodymium iron boron segment embedded in the rotor. Each coil is wound in the same direction, and insulating paper is placed after each layer of winding. The coil assembly is formed by winding wires inside an iron core, which is a common silicon steel sheet, generally disc-shaped with a circular cavity at the center surrounded by six evenly distributed irregularly shaped grooves. The grooves are truncated polygons with an inner diameter larger than the outer diameter of the filling pipe.

[0012] Preferably, the coil protective shell is an ordinary iron plate, with a shape consistent with the electromagnetic coil assembly, and its size must exceed the outer shape of the electromagnetic coil assembly by 2cm. It is divided into upper and lower halves that are fastened together and fixed to the outer wall of the filling pipe.

[0013] Beneficial effects: When the tailings paste flows through this stirring pipe section, the device is activated. At this time, the controller sequentially supplies alternating current with ordered phase changes to the electromagnetic coil, thereby generating a rotating magnetic field of sufficient strength and continuously changing direction in the area where the permanent magnet section is located inside the pipe. This rotating magnetic field penetrates the filling pipe wall and couples with the permanent magnet inside the rotor, generating a magnetic torque that drives the stirring rotor without contact, causing it to rotate along with the spiral ribbon blades. The rotating blades forcibly stir the tailings paste flowing through this section, breaking up any sediment clumps that may form, thus ensuring that the paste remains in a uniform suspension state throughout the entire transportation process, fundamentally solving the problems of solid phase sedimentation, segregation, and the resulting pipe blockage.

[0014] In summary, this invention achieves continuous online stirring without penetrating the pipe wall dynamic seal through an internal and external magnetic coupling drive design. It has a reliable structure, low maintenance requirements, and can effectively ensure the uniformity and smoothness of paste delivery. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the pipeline conveying and mixing device of the present invention; Figure 2 This is a schematic diagram of the magnetic stirring unit of the pipeline conveying and stirring device of the present invention; Figure 3 This is a schematic diagram of the magnetic field drive unit of the pipeline conveying and stirring device of the present invention; Figure 4 This is a schematic diagram showing the connection between the sealed rolling bearing and the bearing housing in the pipeline conveying and mixing device of the present invention; Figure 5 This is a longitudinal section schematic diagram of the magnetic stirring unit of the pipeline conveying and stirring device of the present invention; In the diagram: 1. Rotor (1a - section with high-performance permanent magnet neodymium iron boron; 1b - ordinary section); 2. Spiral ribbon blade; 3. Sealed rolling bearing; 4. Conical fairing; 5. Bearing housing; 6. Fixing screw; 7. Filling pipe; 8. Coil; 9. Iron core; 10. Controller; 11. Coil protective shell; 12. Tailings paste flow direction. Detailed Implementation

[0016] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Those skilled in the art will understand that the following embodiments are for illustrative purposes only and should not be considered as limiting the scope of the invention. Where specific techniques, connections, or conditions are not specified in the embodiments, they are performed in accordance with the techniques, connections, or conditions described in the literature in the field or according to the product manual. Materials, instruments, or equipment used without specified manufacturers are all conventional products that can be obtained through purchase.

[0017] like Figures 1-5 As shown, the present invention provides a long-distance pipeline conveying and mixing device for mine tailings paste filling. Its core lies in achieving contactless drive through a magnetic coupling method with internal and external separation, thereby enabling continuous and efficient online mixing of the tailings paste within the pipeline. The device mainly consists of two parts: a magnetic stirring unit installed inside the filling pipeline 7 and a magnetic field driving unit fixed outside the filling pipeline 7.

[0018] Reference Figure 1 , Figure 2 and Figure 4 The specific structure of the magnetic stirring unit is as follows: The stirring rotor 1 is the core of the stirring action. Its body is divided into two sections along the axial direction: a high-performance permanent magnet neodymium iron boron section 1a (the length of which can be adjusted within the range of 0~50cm) embedded near the flow direction of the tailings paste, and a subsequent ordinary section 1b. A spiral ribbon blade 2 is welded to the outer wall of the rotor 1. Its diameter is approximately 1 / 3 of the inner diameter of the filling pipe 7. This blade rotates with the rotor, generating effective axial and radial stirring of the paste, ensuring effective stirring intensity while minimizing resistance to the fluid. Both ends of the stirring rotor 1 are cut with external threads of the same specification.

[0019] The stirring rotor 1 is connected to the inner ring thread of the double-sided sealed rolling bearing 3 via threads at both ends. This bearing adopts a double-sided sealing structure, which can effectively isolate tailings slurry and prevent it from entering the bearing interior, ensuring long-term operational reliability.

[0020] At the front end of the bearing 3, near the direction of the tailings paste flow, a conical shroud 4 is also installed on the stirring rotor 1. This shroud is made of wear-resistant steel, and its bottom diameter matches the outer ring diameter of the rolling bearing 3. A threaded hole is machined at the center of the bottom surface of the shroud 4, which is then fastened by threaded engagement with the end of the stirring rotor 1. The conical structure smoothly guides the paste, reduces localized eddies and resistance, and protects the front bearing from direct impact from large particles.

[0021] The rolling bearing 3 is nested within the inner ring of the bearing housing 5. In this embodiment, the bearing housing 5 is a spoked disc structure made of wear-resistant steel, comprising an inner steel ring, an outer steel ring, and three steel rods forming a 120° angle between them. The inner diameter of the inner ring is slightly smaller than the maximum outer diameter of the rolling bearing 3 to achieve an interference fit; the outer diameter of the outer ring is slightly smaller than the inner diameter of the filling pipe 7. Three threaded holes forming a 120° angle are evenly distributed on the outer ring. One end of each of the three steel rods is welded to the outer surface of the inner ring, and the other end is welded to the inner surface of the outer ring, with the welding point located at the center of two adjacent threaded holes on the outer ring. By screwing three fixing screws 6 into the threaded holes of the outer ring and pressing them against the inner wall of the filling pipe 7, the entire bearing housing 5 and the magnetic stirring unit it supports can be firmly fixed inside the pipe.

[0022] Reference Figure 1 , Figure 3 and Figure 5 The specific structure of the magnetic field driving unit is as follows: The core of this unit is an electromagnetic coil assembly, which consists of an iron core 9 and coils 8. The iron core 9 is made of ordinary silicon steel sheets stacked together, and is generally disc-shaped with a circular hole in the center to fit onto the outer wall of the filling pipe 7. Its inner diameter is slightly larger than the outer diameter of the pipe. Six irregularly shaped grooves in the form of truncated polygons are evenly distributed around the iron core 9.

[0023] Coils 8 are wound into six grooves in the iron core 9, forming an electromagnetic coil group. Each coil 8 is rectangular in shape and approximately 50 cm in length. The six coils are symmetrically distributed around the pipe, with adjacent coils forming a 60° angle, and their axes are perpendicular to the axis of the filling pipe 7. The placement of the coils 8 precisely corresponds to the permanent magnet section 1a inside the stirring rotor 1. The winding direction of each coil 8 is consistent to ensure the generated magnetic field direction meets expectations, and insulating paper is placed after each layer of winding to ensure electrical safety.

[0024] The electromagnetic coil assembly is covered by a coil protective shell 11 made of ordinary iron plate. The shape of the protective shell 11 matches the shape of the electromagnetic coil assembly, and its size exceeds the shape of the assembly by about 2 cm, serving to provide physical protection and confine stray magnetic fields. For ease of installation, the protective shell 11 is designed as two halves, which are fastened to the outer wall of the filling pipe 7 by fasteners after being snapped together.

[0025] A controller 10 is also installed on the outer wall of the filling pipe 7. The controller 10 is connected to the underground lighting circuit of the mine and contains a frequency conversion control circuit to receive external commands or signals and output phase- and frequency-controllable multiphase AC power to six electromagnetic coils 8.

[0026] The specific embodiments of the present invention have been described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of the present invention.

Claims

1. A tailings paste filling pipeline conveying and mixing device for mines, characterized in that, include: A magnetic stirring unit is fixedly installed inside the filling pipe (7). The magnetic stirring unit includes a stirring rotor (1), stirring blades (2) fixedly disposed on the outer wall of the stirring rotor (1), rolling bearings (3) installed on the left and right sides of the stirring rotor (1), a conical shroud (4) installed on the stirring rotor (1) near the end of the tailings paste flow direction (12), and a bearing seat (5) for supporting and fixing the rolling bearings (3). The stirring rotor (1) is connected to the inner ring of the rolling bearings (3), and the stirring rotor (1) is connected to the conical shroud (4). The rolling bearings (3) are nested on the inner ring of the bearing seat (5), and the outer ring of the bearing seat (5) is fixed to the inner wall of the filling pipe (7) by screws (6). A magnetic field drive unit is fitted outside the filling pipe (7). The magnetic field drive unit includes an electromagnetic coil group, a coil protective shell (11) covering the electromagnetic coil group, and a controller (10) fixed to the outer wall of the filling pipe (7). The stirring rotor (1) has a high-performance permanent magnet embedded in its body; after the electromagnetic coil group is energized, it generates a rotating magnetic field under the action of the controller (10). The magnetic field is coupled to the high-performance permanent magnet through the wall of the filling pipe (7) and drives the magnetic stirring unit to rotate without contact.

2. The tailings paste filling pipeline conveying and mixing device according to claim 1, characterized in that, The stirring blade (2) is a spiral ribbon with a diameter of 1 / 3 of the diameter of the filling pipe (7); the stirring rotor (1) has the high-performance permanent magnet embedded in a range of 0~50cm at one end near the flow direction (12) of the tailings paste, and the permanent magnet is a neodymium iron boron permanent magnet; the two ends of the stirring rotor (1) are cut with threads.

3. The tailings paste filling pipeline conveying and mixing device according to claim 2, characterized in that, The rolling bearing (3) has a double-sided sealing structure, and its inner ring is threaded to match the threads at both ends of the stirring rotor (1).

4. The tailings paste filling pipeline conveying and mixing device according to claim 3, characterized in that, The conical shroud (4) is made of wear-resistant steel, and its bottom diameter is consistent with the outer ring diameter of the rolling bearing (3). The center of the bottom surface of the conical shroud (4) is provided with a machined threaded hole that matches the thread at the end of the stirring rotor (1).

5. A tailings paste filling pipeline conveying and mixing device according to claim 1, characterized in that, The bearing housing (5) is a spoked disc structure made of wear-resistant steel, including an inner steel ring, an outer steel ring, and three steel bars that form a 120° angle between each other connecting the inner and outer steel rings; the inner diameter of the inner ring is smaller than the maximum diameter of the rolling bearing (3); the outer diameter of the outer ring is smaller than the inner diameter of the filling pipe (7), and the outer ring has three threaded holes that form a 120° angle between each other; one end of the steel bar is welded to the outer surface of the inner ring, and the other end is welded to the inner surface of the outer ring, and the welding point is located in the middle of two adjacent threaded holes of the outer ring.

6. A tailings paste filling pipeline conveying and mixing device according to claim 1, characterized in that, The electromagnetic coil group consists of 6 coils (8) wound on an iron core (9); the 6 coils (8) are symmetrically distributed around the axis of the filling pipe (7) in space, and the included angle between adjacent coils (8) is 60°; the axis of the coil (8) is perpendicular to the axis of the filling pipe (7), and its placement corresponds to the section of the stirring rotor (1) in which a high-performance permanent magnet is embedded.

7. A tailings paste filling pipeline conveying and mixing device according to claim 6, characterized in that, The iron core (9) is made of silicon steel sheet and is in the shape of a disc. It has a circular hole in the center to fit on the outer wall of the filling pipe (7). Its inner diameter is larger than the outer diameter of the filling pipe (7). There are 6 truncated polygonal grooves evenly distributed around the iron core (9) for winding the coil (8).

8. A tailings paste filling pipeline conveying and mixing device according to claim 1, characterized in that, The coil protective shell (11) is made of iron plate. Its shape is consistent with the outer contour of the electromagnetic coil group. Its size exceeds the outer shape of the electromagnetic coil group by 2cm. The coil protective shell (11) is divided into upper and lower halves, which are fastened together and fixed to the outer wall of the filling pipe (7).

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