Intelligent medium adding device and system for coal mine with double-loop circulation structure

Abstract

The invention discloses an intelligent medium adding device and system for a coal mine with a double-loop circulation structure, and relates to the field of coal dressing dense medium technology.The device comprises a medium box, a double-loop medium adding mechanism, a mixer, a monitoring element and a controller, the double-loop medium adding mechanism comprises a first medium adding loop and a second medium adding loop which are the same in structure and standby for each other, and the first medium adding loop and the second medium adding loop are arranged in parallel; each loop comprises a constant feeder, a suction pump and a loop control valve, a high-precision densimeter and a mass flow meter are arranged on the pipeline, outputs of the two loops are output after being converged in the mixer, and the controller is integrated with a double-loop coordination control module and a medium density closed-loop control module. Load balancing, fault seamless switching and accurate closed-loop adjustment of medium density are achieved. Through combination of hardware redundancy and software intelligent control, the problems that a traditional single-loop medium adding mode is low in precision, poor in stability and insufficient in reliability are solved, and the automation level and production continuity of the dense medium coal preparation process are remarkably improved.

Description

Technical Field

[0001] This invention relates to the field of coal mining technology, and in particular to a dual-loop circulating intelligent medium feeding device and system for coal mines. Background Technology

[0002] In heavy media coal preparation processes, it is necessary to continuously and stably add media such as magnetite powder to the system to maintain the density of a qualified suspension, which is crucial for ensuring separation accuracy. Currently, most coal preparation plants use a single-loop media feeding method, typically consisting of a feeder, a conveying pump, and simple valves. Its control largely relies on manual experience or simple open-loop regulation.

[0003] The existing technology has the following main drawbacks: 1) Poor accuracy and stability: Single-loop conveying is susceptible to fluctuations in pump performance, changes in pipeline characteristics, and media deposition, leading to unstable density and flow rate of the added medium, which in turn causes fluctuations in sorting density and affects product quality. 2) Low reliability: If a key piece of equipment in the medium addition loop (such as a pump or feeder) fails, the entire medium addition process will be immediately interrupted, requiring shutdown for maintenance, which seriously affects the continuity and efficiency of production. 3) Insufficient automation and intelligence: There is a lack of real-time and accurate monitoring and closed-loop feedback control of medium parameters (such as density and flow rate), making it impossible to adaptively adjust according to changes in production needs, and even more difficult to achieve preventive maintenance and process optimization. 4) Media caking: The medium is prone to caking in the storage silo due to moisture and static pressure, resulting in poor material discharge and affecting the uniformity of feeding.

[0004] Therefore, developing a medium addition device and system with high reliability, high control precision, and intelligent operation is of great significance for improving the process level of heavy medium coal preparation. Summary of the Invention

[0005] The purpose of this application is to provide a dual-loop circulating intelligent medium-addition device and system for coal mines to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, this application provides the following technical solution: a dual-loop circulating intelligent medium feeding device and system for coal mines, including a medium tank;

[0007] A dual-loop medium feeding mechanism includes a first medium feeding loop and a second medium feeding loop. The first and second medium feeding loops have the same structure and each includes a quantitative feeder, a suction pump, a medium feeding pipe, and a loop control valve. The quantitative feeder, suction pump, and loop control valve are sequentially fixedly installed on the medium feeding pipe along the medium feeding direction. The input end of the quantitative feeder leads into the interior of the medium tank.

[0008] A mixer, wherein the bottom of the mixer is connected to the feed pipes of the first feed circuit and the second feed circuit, and the bottom end of the mixer is connected to a discharge pipe;

[0009] The monitoring element includes a high-precision density meter, a mass flow meter, and a flow meter. The high-precision density meter and the mass flow meter are fixedly installed on the inlet pipes of the first and second inlet pipes, and the flow meter is fixedly installed on the outlet pipe.

[0010] The controller is fixedly installed on the medium tank and is electrically connected to the quantitative feeder, the suction pump, the loop control valve, the high-precision density meter, the mass flow meter and the flow meter.

[0011] Preferably, the controller has a built-in dual-loop coordination control module, which automatically allocates the load of the first and second dielectric circuits according to the total dielectric demand, or seamlessly switches to the other circuit for full-load operation when one circuit fails.

[0012] Preferably, the controller has a built-in medium density closed-loop control module: based on the target medium density set in the process, it compares the feedback value of the density meter in real time, and dynamically adjusts the feeding speed of the quantitative feeder and the rotation speed of the conveying pump through a PID algorithm to achieve precise closed-loop control of density.

[0013] Preferably, a motor is fixedly installed at the bottom of the media tank, and the output end of the motor drives a disturbance frame that enters the media tank. A filter screen is fixedly installed inside the media tank near the bottom, and a scraper with its bottom in contact with the upper part of the filter screen is fixedly installed on the disturbance frame.

[0014] Preferably, a vibrator is fixedly installed on the outer wall of the scraper.

[0015] Preferably, an alarm is fixedly installed on the media box, and the alarm is electrically connected to the controller.

[0016] Preferably, the mixer includes an upper shell and a lower shell, which are connected by bolts. A sealing ring is provided at the connection between the upper shell and the lower shell, and a buffer net is fixed inside the cavity enclosed by the upper shell and the lower shell.

[0017] Preferably, the media tank has a removable and openable inspection port on its rear side.

[0018] In summary, the technical effects and advantages of this invention are as follows:

[0019] Extremely high operational reliability: By setting up a first and second media feeding loop with identical structures and serving as backups for each other, hardware-level redundancy is achieved. When equipment in either loop (such as the suction pump or the quantitative feeder) fails, the controller can immediately disconnect the faulty loop and instruct the other loop to operate at full load, achieving "seamless switching" and ensuring the continuity of the media feeding process, thus avoiding unplanned downtime caused by single-point failures.

[0020] Exceptional control precision and stability: The dual loops can operate in parallel, smoothing out flow pulsations in a single unit. By installing high-precision density meters and mass flow meters on each loop, and combining them with the controller's built-in media density closed-loop control module (using a PID algorithm), real-time and precise feedback adjustment of media density and flow rate can be achieved, ensuring highly stable media parameters added to the system and providing a solid foundation for the core sorting process.

[0021] Intelligent operation and maintenance: The controller not only performs basic control, but its dual-loop coordinated control module can intelligently allocate the load and optimize equipment operating efficiency. Simultaneously, through data feedback from monitoring components, the system can perform fault diagnosis and early warning. For example, combined with the disturbance frame design with scraper and vibrator as described in claims 4-5, it can effectively prevent media caking, ensure smooth material feeding, and embody the intelligent concept of proactive maintenance. Attached Figure Description

[0022] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0023] Figure 1 This is a schematic diagram of the structure of a dual-loop circulating intelligent medium-adding device and system for coal mines according to an embodiment of this application;

[0024] Figure 2 This is a schematic diagram showing the disassembled structure of a dual-loop circulating intelligent medium-adding device and system for coal mines according to an embodiment of this application;

[0025] Figure 3 This is a schematic diagram of the first medium-adding loop structure of a dual-loop intelligent medium-adding device and system for coal mines according to an embodiment of this application;

[0026] Figure 4 This is a schematic diagram of the lower shell assembly structure of a dual-loop circulating intelligent medium-adding device and system for coal mines according to an embodiment of this application;

[0027] Figure 5This is a schematic diagram of the internal structure of the medium tank of a dual-loop circulating intelligent medium-adding device and system for coal mines, as described in an embodiment of this application.

[0028] Figure 6 This is a cross-sectional view of the scraper structure of a dual-loop circulating intelligent medium-adding device and system for coal mines according to an embodiment of this application.

[0029] Figure 7 This is a system control block diagram of a dual-loop circulating intelligent medium-adding device and system for coal mines, as described in an embodiment of this application.

[0030] In the diagram: 1. Medium tank; 2. First medium addition loop; 3. Second medium addition loop; 4. Mixer; 5. Discharge pipe; 6. Quantitative feeder; 7. Suction pump; 8. Medium addition pipe; 9. Loop control valve; 10. High-precision density meter; 11. Mass flow meter; 12. Controller; 13. Flow meter; 14. Upper housing; 15. Lower housing; 16. Buffer screen; 17. Sealing ring; 18. Alarm; 19. Motor; 20. Disruptor frame; 21. Filter screen; 22. Scraper; 23. Vibrator; 24. Inspection port. Detailed Implementation

[0031] The technical solutions of the embodiments of the present invention will be clearly and completely described 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.

[0032] In the description of this disclosure, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," "outer," "top," and "bottom," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this disclosure 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, and therefore should not be construed as a limitation of this disclosure. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0033] It should also be noted that all standard parts used in this application are commercially available, and can be custom-made according to the description and drawings. Unless otherwise expressly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this disclosure based on the specific circumstances, and unless explicitly limited, machinery, parts, and equipment can all adopt conventional models in the prior art.

[0034] In this document, the term "comprising" is intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0035] Example: A dual-loop circulating intelligent medium addition device and system for coal mines, including a medium tank 1, a dual-loop medium addition mechanism, a mixer 4, a monitoring element and a controller 12.

[0036] The media tank 1 is a vertical silo used to store magnetite powder media. A motor 19 is installed at its bottom, and the output shaft of the motor 19 drives a disturbance frame 20 that extends into the tank. Multiple scrapers 22 are mounted on the disturbance frame 20, with the bottom of the scrapers 22 contacting the upper surface of a filter screen 21 fixedly installed near the bottom of the tank. A small vibrator 23 can also be installed on the outer wall of the scrapers 22. During operation, the motor 19 drives the disturbance frame 20 to rotate slowly, and the scrapers 22 scrape the media above the filter screen 21 to prevent caking; the micro-vibration of the vibrator 23 further promotes the loosening of the media, ensuring that the media can smoothly fall through the filter screen 21 to the discharge area at the bottom of the tank. The side wall of the media tank 1 has an inspection port 24 with a sealed cover, and an audible and visual alarm 18 is installed on the top of the tank.

[0037] The dual-loop medium feeding mechanism consists of a first medium feeding loop 2 and a second medium feeding loop 3. The first medium feeding loop 2 includes a metering feeder 6, a suction pump 7, a medium feeding pipe 8, and a loop control valve 9. The second medium feeding loop 3 includes a corresponding metering feeder 6, suction pump 7, medium feeding pipe 8, and loop control valve 9. The two loops have identical structures, models, and installation methods. The inlet of the metering feeder 6 extends into the bottom of the medium tank 1, and the suction pump 7 is preferably a variable frequency slurry pump.

[0038] The mixer 4 is located below the dual-loop media supply mechanism and is composed of an upper housing 14 and a lower housing 15 connected by bolts, with a sealing ring 17 at the connection. A buffer mesh 16 is fixed inside its internal cavity. The media supply pipes 8 of the first media supply loop 2 and the second media supply loop 3 both enter the upper housing 14 of the mixer 4 from above. The two media streams are fully mixed inside the mixer 4 after collision and diffusion through the buffer mesh 16. The bottom of the mixer 4 is connected to a discharge pipe 5 via a flange, which transports the media suspension to a qualified media tank.

[0039] The monitoring elements include: a high-precision density meter 10 and a mass flow meter 11 installed on the medium supply pipe 8 of the first medium supply loop 2; a high-precision density meter 10 and a mass flow meter 11 installed on the medium supply pipe 8 of the second medium supply loop 3; and a flow meter 13 installed on the discharge pipe 5.

[0040] The controller 12 is an industrial control cabinet integrating a PLC and a touch screen, fixed to the side of the media tank 1. It is electrically connected to all motors 19, quantitative feeder 6, suction pump 7, loop control valve 9, various monitoring elements, and alarm 18.

[0041] Work process:

[0042] During normal operation, the operator sets the target medium density and total required flow rate on the touchscreen of the controller 12. The dual-loop coordinated control module within the controller 12 activates the first medium supply loop 2 and the second medium supply loop 3, each by default undertaking 50% of the load (achieved by adjusting the frequency of the suction pump 7). The high-precision density meters 10 of the two loops monitor the density of their respective branches in real time, and the data is fed back to the controller 12.

[0043] The medium density closed-loop control module in controller 12 compares the measured average density with the target value, and through PID calculation, outputs a signal to synchronously adjust the rotation speed of the two quantitative feeders 6, thereby accurately controlling the feeding amount and achieving density closed-loop stability.

[0044] If the mass flow meter 11 detects a sharp drop in the flow rate of the first medium-feeding loop 2 (possibly due to a malfunction of the suction pump 7 or a blockage in the medium-feeding pipe 8), the controller 12 immediately determines that the loop is faulty, and the dual-loop coordinated control module performs the following operations: 1) closes the loop control valve 9 of the faulty loop, stopping the operation of that loop; 2) increases the frequency of the suction pump 7 in the second medium-feeding loop 3 to a level that meets the total required flow rate; 3) issues an audible and visual alarm via the touch screen and alarm 18, prompting maintenance personnel to perform maintenance. During this process, the medium-feeding operation continues only through the second medium-feeding loop 3, and production is not interrupted.

[0045] At the same time, the controller 12 starts the motor 19 and vibrator 23 in the medium tank 1 at regular intervals and runs them for a period of time to prevent the medium from caking and ensure the reliability of the material supply from the source.

[0046] Finally, it should be noted that the above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A dual-loop circulating intelligent medium-addition device and system for coal mines, characterized in that: include: Media box (1); The dual-loop medium feeding mechanism includes a first medium feeding loop (2) and a second medium feeding loop (3). The first medium feeding loop (2) and the second medium feeding loop (3) have the same structure and both include a quantitative feeder (6), a suction pump (7), a medium feeding pipe (8), and a loop control valve (9). The quantitative feeder (6), the suction pump (7), and the loop control valve (9) are fixedly installed on the medium feeding pipe (8) in sequence along the medium feeding direction. The input end of the quantitative feeder (6) is connected to the inside of the medium tank (1). The mixer (4) is connected at the bottom to the medium supply pipe (8) of the first medium supply circuit (2) and the second medium supply circuit (3), and the bottom end of the mixer (4) is connected to the discharge pipe (5). The monitoring elements include a high-precision density meter (10), a mass flow meter (11) and a flow meter (13). The high-precision density meter (10) and the mass flow meter (11) are fixedly installed on the medium supply pipes (8) of the first medium supply loop (2) and the second medium supply loop (3). The flow meter (13) is fixedly installed on the discharge pipe (5). The controller (12) is fixedly installed on the medium tank (1) and is electrically connected to the quantitative feeder (6), the suction pump (7), the loop control valve (9), the high-precision density meter (10), the mass flow meter (11) and the flow meter (13).

2. The intelligent medium-addition device and system for coal mines with a dual-loop circulating structure according to claim 1, characterized in that: The controller (12) has a built-in dual-loop coordination control module. The dual-loop coordination control module automatically allocates the load of the first dielectric circuit (2) and the second dielectric circuit (3) according to the total dielectric demand, or seamlessly switches to the other circuit to full load operation when one circuit fails.

3. The intelligent medium-addition device and system for coal mines with a dual-loop circulating structure according to claim 1, characterized in that: The controller (12) has a built-in medium density closed-loop control module: based on the target medium density set in the process, it compares the feedback value of the density meter in real time, and dynamically adjusts the feeding speed of the quantitative feeder (6) and the rotation speed of the suction pump (7) through the PID algorithm to achieve precise closed-loop control of density.

4. The intelligent medium-addition device and system for coal mines with a dual-loop circulating structure according to claim 1, characterized in that: A motor (19) is fixedly installed at the bottom of the media tank (1). The output end of the motor (19) drives a disturbance frame (20) that enters the media tank (1). A filter screen (21) is fixedly installed inside the media tank (1) near the bottom. A scraper (22) with its bottom in contact with the upper part of the filter screen (21) is fixedly installed on the disturbance frame (20).

5. The intelligent medium-addition device and system for coal mines with a dual-loop circulating structure according to claim 4, characterized in that: A vibrator (23) is fixedly installed on the outer wall of the scraper (22).

6. The intelligent medium-addition device and system for coal mines with a dual-loop circulating structure according to claim 1, characterized in that: An alarm (18) is fixedly installed on the media box (1), and the alarm (18) is electrically connected to the controller (12).

7. The intelligent medium-addition device and system for coal mines with a dual-loop circulating structure according to claim 1, characterized in that: The mixer (4) includes an upper shell (14) and a lower shell (15), which are connected by bolts. A sealing ring (17) is provided at the connection between the upper shell (14) and the lower shell (15), and a buffer net (16) is fixed inside the cavity enclosed by the upper shell (14) and the lower shell (15).

8. The intelligent medium-addition device and system for coal mines with a dual-loop circulating structure according to claim 6, characterized in that: The media tank (1) is provided with a detachable and openable inspection port (24) on the rear side.

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