Intelligent medium adding system for coal dressing

Abstract

The utility model relates to the technical field of coal dressing, in particular to an intelligent medium adding system for coal dressing. The intelligent medium adding system comprises a three-dimensional radar scanner, a cantilever crane, a grab bucket, a storage bin, a feeder, a Z-shaped elevator, a medium mixing barrel, a PLC and a liquid level meter. The cantilever crane and the storage bin are arranged in a dense medium storage yard, the storage bin is located in the hoisting radius of the cantilever crane, the grab bucket is arranged on the cantilever crane and driven by the cantilever crane to move, the feeder is arranged at a discharging port in the lower portion of the storage bin, and a discharging port of the feeder is in butt joint with a feeding port of the Z-shaped elevator. A discharge hole of the Z-shaped elevator extends to a barrel opening in the upper part of the medium mixing barrel; the three-dimensional radar scanner is arranged in a dense medium storage yard and is in communication connection with the PLC, the liquid level meter is arranged in the medium mixing barrel and is electrically connected with the PLC, and the PLC is electrically connected with the cantilever crane, the grab bucket, the feeder and the Z-shaped elevator. Intelligent control over medium filling is achieved, the frequency of manual intervention is reduced, and the accuracy and efficiency of coal dressing medium filling are greatly improved.

Description

Technical Field

[0001] This utility model relates to the field of coal preparation technology, and in particular to a system for intelligent coal preparation media addition. Background Technology

[0002] In the heavy medium coal preparation process, the density of the stable suspension in the medium tank is a crucial factor in ensuring the separation effect. The suspension is formed by mixing heavy medium, magnetic powder, and water; therefore, the addition of heavy medium is a very important step in heavy medium coal preparation. In actual production, as the heavy medium in the suspension is gradually consumed, the density of the suspension gradually decreases. In the initial stage of density decrease, the liquid can be diverted by the diversion box under the desliming screen. After passing through the magnetic separator, the heavy medium is recovered into the medium tank, while the water is discharged into the circulating water system. This ensures that the suspension can be maintained at the required density. However, as the water is discharged into the circulating water system, the liquid level in the medium tank gradually decreases. If the liquid level drops to a certain level and the heavy medium is not added in time, the suspension density and the hydrocyclone feed pressure will both fall below the production targets, thus affecting the separation effect of heavy medium coal preparation. Utility Model Content

[0003] To address the aforementioned problems, this utility model provides a system for intelligent media addition in coal preparation.

[0004] This utility model provides a system for intelligent coal preparation media feeding, including a three-dimensional radar scanner, a cantilever crane, a grab bucket, a storage silo, a feeder, a Z-type elevator, a media mixing tank, a PLC controller, and a level gauge; the cantilever crane and the storage silo are located in the heavy media stockpile, and the storage silo is located within the lifting radius of the cantilever crane, the grab bucket is mounted on the cantilever crane and moved by the cantilever crane, the feeder is located at the lower outlet of the storage silo, the outlet of the feeder is connected to the inlet of the Z-type elevator, and the outlet of the Z-type elevator extends to the upper opening of the media mixing tank;

[0005] A 3D radar scanner is installed in the heavy media storage area and is connected to the PLC controller. A level gauge is installed inside the combined media tank and is electrically connected to the PLC controller. The PLC controller is electrically connected to the jib crane, grab bucket, feeder, and Z-type elevator.

[0006] Compared with existing technologies, the advantages of this invention are as follows: it achieves intelligent control of bulk medium addition, reduces the frequency of manual intervention, and significantly improves the accuracy and efficiency of coal preparation medium addition. Based on the real-time calculation of the difference between the target ash content and the actual ash content by the intelligent sorting system, the suspension density is automatically adjusted through the coupling relationship and logical rules between ash content and density. The amount of medium added is adjusted in real time according to the change in suspension density and liquid level data. The intelligent feedback mechanism of liquid level detection effectively avoids the situation of too much or too little medium, ensuring the stability of the suspension and the optimal utilization of the medium in the coal preparation process. In addition, the combined use of the Z-type elevator, screw feeder, and cantilever crane greatly reduces the intensity of manual labor and improves the safety and reliability of system operation.

[0007] Optionally, the storage silo can be a weighing silo structure, and the weighing sensor in the weighing silo is electrically connected to the PLC controller.

[0008] Optionally, a medium pump is connected to the discharge port at the bottom of the medium tank, and the discharge port of the medium pump is connected to the hydrocyclone through a pipe; a water supply pipe is connected to the pipe near the discharge port of the medium pump, a water supply valve is installed on the water supply pipe, and a density meter is also installed on the pipe; the medium pump, the water supply valve, and the density meter are all electrically connected to the PLC controller.

[0009] Optionally, a gate valve is installed at the discharge port of the Z-type elevator, and the gate valve is electrically connected to the PLC controller.

[0010] Optionally, the PLC controller communicates in a closed loop with the heavy medium intelligent sorting ash control and dense control system. Attached Figure Description

[0011] The accompanying drawings, which are included to provide a further understanding of the present invention and form part of this application, do not constitute a limitation thereof. In the drawings:

[0012] Figure 1 This is a schematic diagram of the architecture of the intelligent coal preparation medium addition system in this embodiment of the present invention.

[0013] Among them, 1. 3D radar scanner; 2. cantilever crane; 3. grab bucket; 4. storage silo; 5. feeder; 6. Z-type elevator; 7. media tank; 8. heavy media stack; 9. gate valve; 10. radar level gauge. Detailed Implementation

[0014] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the embodiments and accompanying drawings. Here, the illustrative embodiments and descriptions of this utility model are used to explain the present utility model, but are not intended to limit the present utility model.

[0015] See Figure 1The system for intelligent coal preparation media feeding in this embodiment includes a three-dimensional radar scanner 1, a cantilever crane 2, a grab bucket 3, a storage silo 4, a feeder 5, a Z-type elevator 6, a media mixing tank 7, a PLC controller, and a level gauge. The cantilever crane 2 and the storage silo 4 are located in the heavy media stockpile, and the storage silo 4 is located within the lifting radius of the cantilever crane 2. The grab bucket 3 is mounted on the cantilever crane 2 and is moved by the cantilever crane 2. The feeder 5 is located at the lower outlet of the storage silo 4, and the outlet of the feeder 5 is connected to the inlet of the Z-type elevator 6. The outlet of the Z-type elevator 6 extends to the upper opening of the media mixing tank 7.

[0016] The three-dimensional radar scanner 1 is installed in the heavy medium storage yard and is connected to the PLC controller. The level gauge is installed in the medium tank 7 and is electrically connected to the PLC controller. The PLC controller is electrically connected to the cantilever crane 2, grab bucket 3, feeder 5 and Z-type elevator 6.

[0017] Specifically, the PLC controller can scan the stacking of heavy media in the heavy media stockpile using a 3D radar scanner 1, and control the cantilever crane 2 to move the grab bucket 3 to the heavy media pile 8 (preferably the heavy media pile with the highest peak value within the scanning range of the 3D radar scanner) based on the scanned stacking conditions. After moving to the correct position, the PLC controller controls the cantilever crane 2 to lower the grab bucket 3 and control the grab bucket 3 to grab the heavy media from the heavy media pile 8. After grabbing, the PLC controller controls the cantilever crane 2 to move the grab bucket 3 to the storage silo 4 and controls the grab bucket 3 to store the heavy media in the storage silo 4. During the production process, the PLC controller monitors the liquid level in the media tank 7 in real time using a level gauge. When the liquid level reaches the set lower threshold, the PLC controller sequentially starts the Z-type elevator 6 and the feeder 5 to add media.

[0018] In practice, a screw feeder is selected as the feeder 5. The storage silo 4 is a weighing silo structure, and the weighing sensor in the weighing silo is electrically connected to the PLC controller. Currently, the core structure of the weighing silo usually includes the silo, a support frame for supporting the silo, and a weighing sensor installed on the support frame.

[0019] Accordingly, when the grab bucket 3 stores the heavy medium in the storage bin 4, the PLC controller can calculate the volume of suspension that needs to be added after the liquid level in the combined medium tank 7 rises to the set upper limit threshold after the liquid level reaches the set lower limit threshold, the set upper limit threshold, and the design size of the combined medium tank 7, based on the set lower limit threshold, the set upper limit threshold, and the design size of the combined medium tank 7. Then, based on the required increase in the volume of suspension, the required suspension density, the density of the heavy medium, and the density of water, the first weight of the heavy medium to be added is calculated. After that, the heavy medium is added to the storage bin 4 according to the calculated first weight to complete the medium addition process.

[0020] During implementation, a medium pump is connected to the discharge port at the bottom of the medium tank 7. The discharge port of the medium pump is connected to the hydrocyclone through a pipe. A water supply pipe is connected to the pipe near the discharge port of the medium pump. The water supply pipe is connected to a water source, such as the circulating water pool in the coal preparation plant. A water supply valve is installed on the water supply pipe, and a density meter is also installed on the pipe. The medium pump, water supply valve, and density meter are all electrically connected to the PLC controller.

[0021] During the intelligent media addition process, the PLC controller can link the water supply valve according to the density value detected by the densitometer, controlling the opening of the water supply valve to keep the detected density value within the set density fluctuation range, thus ensuring the stability of the suspension density during intelligent media addition. A butterfly valve can be used as the water supply valve. The opening degree of a butterfly valve is typically between 0-90 degrees. During density control, if the detected density exceeds the density fluctuation range, the opening degree of the water supply valve can be gradually increased or decreased according to the set opening degree adjustment step.

[0022] During implementation, when production stops, the PLC controller can also calculate the second weight of the heavy medium required to be added when the liquid level in the combined medium tank 7 reaches the set upper limit threshold based on the current liquid level in the combined medium tank 7, and then sequentially start the Z-type elevator 6 and the feeder 5 to add the second weight of heavy medium to the combined medium tank 7.

[0023] During implementation, a gate valve 9 is installed at the discharge port of the Z-type elevator 6, and the gate valve 9 is electrically connected to the PLC controller. A radar level gauge 10 is installed on the storage silo 4, and the radar level gauge 10 is electrically connected to the PLC controller.

[0024] During implementation, the PLC controller can also communicate in a closed loop with the heavy media intelligent sorting ash control and density control system to obtain the actual ash content of the sorted clean coal detected by the heavy media intelligent sorting ash control and density control system, calculate the difference between the actual ash content and the target ash content, and adjust the required suspension density and thus the amount of medium added based on the calculated difference. The heavy media intelligent sorting ash control and density control system is the company's original system, which includes an ash analyzer for real-time detection of the actual ash content of the sorted clean coal. In specific adjustments, when the PLC controller determines that the actual ash content is lower than the target ash content, the suspension density needs to be increased; when the actual ash content is higher than the target ash content, the suspension density needs to be decreased, and the amount of medium added is adjusted accordingly based on the change in suspension density and liquid level data.

[0025] The solution provided by this utility model embodiment realizes intelligent control of bulk medium addition, reduces the frequency of manual intervention, and significantly improves the accuracy and efficiency of coal preparation medium addition. Based on the real-time calculation of the difference between the target ash content and the actual ash content by the intelligent sorting system, the suspension density is automatically adjusted through the coupling relationship and logical rules between ash content and density. The amount of medium added is adjusted in real time according to the change in suspension density and liquid level data. The intelligent feedback mechanism of liquid level detection effectively avoids the situation of too much or too little medium, ensuring the stability of the suspension in the coal preparation process and the optimal utilization of the medium. In addition, the combined use of Z-type elevator, screw feeder and cantilever crane greatly reduces the intensity of manual labor and improves the safety and reliability of system operation.

[0026] The above description is merely a preferred embodiment of this utility model and is not intended to limit the scope of protection of this utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model are included within the scope of protection of this utility model.

Claims

1. A system for intelligent media feeding in coal preparation, comprising a 3D radar scanner, a cantilever crane, a grab bucket, a storage silo, a feeder, a Z-type elevator, a media mixing tank, a PLC controller, and a level gauge; characterized in that, The jib crane and storage silo are located in the heavy medium stockpile, and the storage silo is located within the lifting radius of the jib crane. The grab bucket is mounted on the jib crane and is moved by the jib crane. The feeder is located at the lower discharge port of the storage silo. The discharge port of the feeder is connected to the inlet of the Z-type elevator. The discharge port of the Z-type elevator extends to the upper opening of the combined medium tank. A 3D radar scanner is installed in the heavy media storage area and is connected to the PLC controller. A level gauge is installed inside the combined media tank and is electrically connected to the PLC controller. The PLC controller is electrically connected to the jib crane, grab bucket, feeder, and Z-type elevator.

2. The system for intelligent media addition in coal preparation as described in claim 1, characterized in that, The storage silo adopts a weighing silo structure, and the weighing sensor in the weighing silo is electrically connected to the PLC controller.

3. The system for intelligent media addition in coal preparation as described in claim 2, characterized in that, The bottom outlet of the medium tank is connected to a medium pump, and the outlet of the medium pump is connected to a hydrocyclone through a pipe; a water supply pipe is connected to the pipe near the outlet of the medium pump, and a water supply valve is installed on the water supply pipe. A density meter is also installed on the pipe; the medium pump, the water supply valve and the density meter are all electrically connected to the PLC controller.

4. The system for intelligent media addition in coal preparation as described in claim 1, characterized in that, The Z-type elevator is equipped with a gate valve at the discharge port, and the gate valve is electrically connected to the PLC controller.

5. The system for intelligent media addition in coal preparation as described in claim 2, characterized in that, The PLC controller communicates in a closed loop with the heavy medium intelligent sorting gray control and airtight control system.

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