Intelligent medium adding system for coal dressing

Abstract

The invention relates to the technical field of coal dressing, in particular to an intelligent medium adding system for coal dressing. The 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. 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. The difference between target ash content and actual ash content is calculated in real time based on an intelligent sorting system, the suspension density is automatically adjusted through the coupling relation between the ash content in the system and the density and a logic rule, and the medium adding amount is adjusted in real time according to the suspension density variation and liquid level data. An intelligent feedback mechanism of liquid level detection effectively avoids the situation that media are too much or insufficient, and the stability of suspension liquid and the optimal utilization of the media in the coal dressing process are ensured. In addition, the Z-shaped elevator, the screw feeder and the cantilever crane are used in cooperation, so that the labor intensity of workers is greatly reduced, and the safety and reliability of system operation are improved.

Description

Technical Field

[0001] The present invention relates to the technical field of coal preparation, and particularly to a system for intelligent medium addition in coal preparation. Background Art

[0002] During the dense medium coal preparation process, the density of the stable suspension in the medium barrel is an important factor to ensure the separation effect. The suspension is formed by mixing heavy medium magnetite powder and water. Therefore, the addition of heavy medium becomes a very important link in dense medium coal preparation. In the actual production process, as the heavy medium in the suspension is gradually consumed, the density of the suspension will gradually decrease. In the initial stage of density decrease, the shunt box under the medium removal screen can be used for shunting. After the shunted liquid passes through the magnetic separator, the heavy medium is recovered into the medium barrel and the water is discharged into the circulating water system. Based on this, it can ensure 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 combined medium barrel will gradually decrease. If the liquid level drops to a certain extent and the addition of heavy medium is not timely, it will cause the density of the suspension and the feeding pressure of the cyclone to be lower than the production index, thus affecting the separation effect of dense medium coal preparation. Summary of the Invention

[0003] In view of the above problems, an embodiment of the present invention provides a system for intelligent medium addition in coal preparation.

[0004] A system for intelligent medium addition in coal preparation provided by an embodiment of the present invention includes a three-dimensional radar scanner, a cantilever crane, a grab bucket, a storage bin, a feeder, a Z-type elevator, a combined medium barrel, a PLC controller, and a liquid level gauge; the cantilever crane and the storage bin are arranged in the heavy medium yard, and the storage bin is located within the hoisting radius of the cantilever crane. The grab bucket is arranged on the cantilever crane and is driven by the cantilever crane to move. The feeder is arranged at the lower discharge port of the storage bin, and the discharge port of the feeder is docked with the feed port of the Z-type elevator. The discharge port of the Z-type elevator extends to the upper barrel opening of the combined medium barrel; The three-dimensional radar scanner is arranged in the heavy medium yard and is communicatively connected with the PLC controller. The liquid level gauge is arranged in the combined medium barrel and is electrically connected with the PLC controller. The PLC controller is electrically connected with the cantilever crane, the grab bucket, the feeder, and the Z-type elevator; The PLC controller scans the stacking situation of the heavy medium in the heavy medium yard through the three-dimensional radar scanner, and controls the cantilever crane to move the grab bucket above the heavy medium pile according to the scanned stacking situation. After moving in place, it controls the cantilever crane to lower the grab bucket and controls the grab bucket to grab the heavy medium from the heavy medium pile. After grabbing, it controls the cantilever crane to move the grab bucket above the storage bin and controls the grab bucket to store the heavy medium in the storage bin; during the production process, the PLC controller monitors the liquid level in the combined medium barrel in real time through the liquid level gauge. When it is determined that the liquid level reaches the set lower limit threshold, the Z-type elevator and the feeder are started in sequence for intelligent medium addition.

[0005] Compared with the prior art, the beneficial effects of the present invention are: it realizes intelligent control of bulk medium filling, reduces the frequency of manual intervention, and greatly improves the accuracy and efficiency of coal preparation and 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 the ash content and density within the system, and 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 excessive or insufficient medium, ensuring the stability of the suspension in the coal preparation process and the optimal use of the medium. In addition, the coordinated use of the Z-type hoist, screw feeder and cantilever crane greatly reduces the intensity of manual labor and improves the safety and reliability of system operation.

[0006] Optionally, the storage silo adopts a weighing silo structure, and a weighing sensor in the weighing silo is electrically connected to the PLC controller; Correspondingly, the process of controlling the grab bucket to store the heavy medium in the storage silo specifically includes: the PLC controller calculates the volume of the suspension that needs to be added when the liquid level in the combining barrel reaches the set lower limit threshold value, the set upper limit threshold value and the design size of the combining barrel according to the set lower limit threshold value of the liquid level in the combining barrel, and then calculates the first weight of the heavy medium that needs to be added according to the volume of the suspension that needs to be added, the density of the suspension required for production, the density of the heavy medium and the density of water, and then stores the heavy medium in the storage silo according to the calculated first weight.

[0007] Optionally, a medium pump is connected to the discharge port at the bottom of the medium barrel, and the discharge port of the medium pump is connected to the cyclone through a pipeline; a water supply pipe is connected to the discharge port of the medium pump on the pipeline, a water supply valve is installed on the water supply pipe, and a density meter is also installed on the pipeline; the medium pump, the water supply valve and the density meter are all electrically connected to the PLC controller; During the intelligent medium addition process, the PLC controller links the water supply valve according to the density value detected by the densitometer, controls the opening of the water supply valve and keeps the detected density value within the set density fluctuation range.

[0008] Optionally, when production is stopped, the PLC controller calculates the second weight of heavy medium that needs to be added when the liquid level in the combined medium barrel reaches a set upper limit threshold based on the current liquid level in the combined medium barrel, and starts the Z-type elevator and feeder in sequence to add the second weight of heavy medium into the combined medium barrel.

[0009] Optionally, a gate valve is provided 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 intelligent heavy medium separation ash control and density control system, obtains the actual ash content of the clean coal detected by the intelligent heavy medium separation ash control and density control system, calculates the difference between the actual ash content and the target ash content, and adjusts the density of the suspension required for production based on the calculated difference, thereby adjusting the medium addition amount. Description of the Drawings

[0011] The drawings described herein are used to provide a further understanding of the present invention, form a part of this application, and do not limit the present invention. In the drawings: Figure 1 It is a schematic structural diagram of the system for intelligent medium addition in coal preparation in an embodiment of the present invention.

[0012] Among them, 1. Three-dimensional radar scanner; 2. Cantilever crane; 3. Grab bucket; 4. Storage bin; 5. Feeder; 6. Z-type elevator; 7. Combined medium barrel; 8. Heavy medium pile; 9. Gate valve; 10. Radar level gauge. Detailed Embodiments

[0013] To make the objectives, technical solutions, and advantages of the present invention clearer and more understandable, the present invention will be further described in detail below in combination with the embodiments and the drawings. Herein, the illustrative embodiments of the present invention and their descriptions are used to explain the present invention, but do not limit the present invention.

[0014] See Figure 1 , the system for intelligent medium addition in coal preparation in an embodiment of the present invention includes a three-dimensional radar scanner 1, a cantilever crane 2, a grab bucket 3, a storage bin 4, a feeder 5, a Z-type elevator 6, a combined medium barrel 7, a PLC controller, and a level gauge; the cantilever crane 2 and the storage bin 4 are arranged in the heavy medium yard, and the storage bin 4 is within the lifting radius of the cantilever crane 2. The grab bucket 3 is arranged on the cantilever crane 2 and is driven by the cantilever crane 2 to move. The feeder 5 is arranged at the lower discharge port of the storage bin 4, and the discharge port of the feeder 5 is docked with the feed port of the Z-type elevator 6. The discharge port of the Z-type elevator 6 extends to the upper barrel opening of the combined medium barrel 7; The three-dimensional radar scanner 1 is arranged in the heavy medium yard and is communicatively connected to the PLC controller. The level gauge is arranged in the combined medium barrel 7 and is electrically connected to the PLC controller. The PLC controller is electrically connected to the cantilever crane 2, the grab bucket 3, the feeder 5, and the Z-type elevator 6; The PLC controller scans the stacking situation of the heavy medium in the heavy medium yard through the three-dimensional radar scanner 1, and controls the cantilever crane 2 to move the grab bucket 3 to the top of the heavy medium pile 8 (preferably the heavy medium pile with the highest peak value within the scanning range of the three-dimensional radar scanner) according to the scanned stacking situation. After moving into place, the cantilever crane 2 is controlled to lower the grab bucket 3 and control the grab bucket 3 to grab the heavy medium from the heavy medium pile 8. After grabbing, the cantilever crane 2 is controlled to move the grab bucket 3 to the top of the storage silo 4, and control the grab bucket 3 to store the heavy medium in the storage silo 4. During the production process, the PLC controller monitors the liquid level in the combined medium barrel 7 in real time through the liquid level meter. When it is determined that the liquid level reaches the set lower limit threshold, the Z-type elevator 6 and the feeder 5 are started in sequence for intelligent medium addition.

[0015] In practice, the feeder 5 uses a screw feeder. The storage silo 4 uses a weighing silo structure, and the weighing sensor in the weighing silo is electrically connected to the PLC controller; the core structure of the weighing silo usually includes a silo, a support frame for supporting the silo, and a weighing sensor installed on the support frame.

[0016] Correspondingly, the process of controlling the grab bucket 3 to store the heavy medium in the storage silo 4 specifically includes: the PLC controller can calculate the volume of the suspension that needs to be added when the liquid level in the combining barrel 7 reaches the set lower limit threshold value, the set upper limit threshold value and the design size of the combining barrel 7 according to the set lower limit threshold value of the liquid level in the combining barrel 7, and then calculate the first weight of the heavy medium that needs to be added according to the volume of the suspension that needs to be increased, the density of the suspension required for production, the density of the heavy medium and the density of water, and then store the heavy medium in the storage silo 4 according to the calculated first weight.

[0017] During the implementation, the lower discharge port of the combined medium barrel 7 is connected to a combined medium pump, and the discharge port of the combined medium pump is connected to the cyclone through a pipeline; a water supply pipe is connected to the discharge port of the combined medium pump on the pipeline, and a water supply valve is installed on the water supply pipe, and a density meter is also installed on the pipeline; the combined medium pump, the water supply valve and the density meter are all electrically connected to the PLC controller; During the intelligent medium addition process, the PLC controller links the water supply valve according to the density value detected by the densitometer, controls the opening of the water supply valve to control the detected density value within the set density fluctuation range, and ensures the stability of the suspension density during the intelligent medium addition process. The water supply valve can be a butterfly valve, and the opening of the butterfly valve changes between 0-90 degrees. During the density control process, when the detected density exceeds the density fluctuation range, the opening of the water supply valve can be gradually increased or decreased according to the set opening adjustment step.

[0018] During implementation, when production is stopped, the PLC controller calculates the second weight of the heavy medium that needs to be added when the liquid level in the combination barrel 7 reaches the set upper limit threshold based on the current liquid level of the combination barrel 7, and starts the Z-type elevator 6 and the feeder 5 in sequence to add the second weight of heavy medium into the combination barrel 7.

[0019] During implementation, a gate valve 9 is provided at the discharge port of the Z-shaped elevator 6, and the gate valve 9 is electrically connected to the PLC controller. A radar level gauge 10 is provided on the storage bin 4, and the radar level gauge 10 is electrically connected to the PLC controller.

[0020] During implementation, the PLC controller forms a communication closed-loop with the heavy medium intelligent separation ash control and density control system, obtains the actual ash content of the separated clean coal detected by the heavy medium intelligent separation ash control and density control system, calculates the difference between the actual ash content and the target ash content, and adjusts the density of the suspension required for production based on the calculated difference, thereby adjusting the medium addition amount; the heavy medium intelligent separation ash control and density control system is an original system of our company, which includes an ash analyzer for real-time detection of the actual ash content of the separated clean coal; during specific adjustment, when the actual ash content is lower than the target ash content, the density of the suspension needs to be increased, and when the actual ash content is higher than the target ash content, the density of the suspension needs to be decreased, and the medium addition amount is adjusted accordingly according to the change amount of the suspension density and the liquid level data.

[0021] The solution provided by the embodiment of the present invention realizes the intelligent control of the addition of bulk media, reduces the frequency of manual intervention, and greatly improves the accuracy and efficiency of coal washing medium addition. Based on the intelligent separation system, the difference between the target ash content and the actual ash content is calculated in real time. Through the coupling relationship and logical rules between ash and density inside the system, the density of the suspension is automatically adjusted, and the medium addition amount is adjusted in real time according to the change amount of the suspension density and the liquid level data. The intelligent feedback mechanism of liquid level detection effectively avoids the situation of excessive or insufficient media, ensuring the stability of the suspension and the optimal utilization of the media during the coal washing process. In addition, the combined use of the Z-shaped elevator, screw feeder, and jib crane greatly reduces the manual labor intensity and improves the safety and reliability of the system operation.

[0022] The above are only the preferred embodiments of the present invention, and are not used to limit the protection scope of the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention are all included in the protection scope of the present invention.

Claims

1. A system for intelligent medium addition in coal preparation, comprising a three-dimensional radar scanner, a jib crane, a grab bucket, a storage silo, a feeder, a Z-type elevator, a combined medium barrel, a PLC controller, and a liquid level gauge; characterized in that, The cantilever crane and storage silo are arranged in the heavy medium yard, and the storage silo is located within the lifting radius of the cantilever crane. The grab bucket is arranged on the cantilever crane and is driven to move by the cantilever crane. The feeder is arranged at the discharge port at the lower part of the storage silo. The discharge port of the feeder is connected with the feed port of the Z-type elevator, and the discharge port of the Z-type elevator extends to the upper barrel port of the combined medium barrel. The three-dimensional radar scanner is arranged in the heavy medium yard and is in communication connection with the PLC controller, the liquid level meter is arranged in the heavy medium barrel and is electrically connected with the PLC controller, and the PLC controller is electrically connected with the cantilever crane, grab bucket, feeder and Z-type hoist; The PLC controller scans the stacking situation of the heavy medium in the heavy medium yard through a three-dimensional radar scanner, and controls the cantilever crane to move the grab bucket to the top of the heavy medium pile according to the scanned stacking situation. After moving into place, the cantilever crane is controlled to lower the grab bucket and control the grab bucket to grab the heavy medium from the heavy medium pile. After grabbing, the cantilever crane is controlled to move the grab bucket to the top of the storage silo, and the grab bucket is controlled to store the heavy medium in the storage silo. During the production process, the PLC controller monitors the liquid level in the combined medium barrel in real time through the liquid level gauge. When it is determined that the liquid level reaches the set lower limit threshold, the Z-type elevator and feeder are started in sequence for intelligent medium addition.

2. The system for intelligent medium addition in coal preparation according to claim 1, wherein, The storage silo adopts a weighing silo structure, and the weighing sensor in the weighing silo is electrically connected to the PLC controller; Correspondingly, the process of controlling the grab bucket to store the heavy medium in the storage silo specifically includes: the PLC controller calculates the volume of the suspension that needs to be added when the liquid level in the combining barrel reaches the set lower limit threshold value, the set upper limit threshold value and the design size of the combining barrel according to the set lower limit threshold value of the liquid level in the combining barrel, and then calculates the first weight of the heavy medium that needs to be added according to the volume of the suspension that needs to be added, the density of the suspension required for production, the density of the heavy medium and the density of water, and then stores the heavy medium in the storage silo according to the calculated first weight.

3. The system for intelligent medium addition in coal preparation according to claim 2, wherein The outlet at the bottom of the combined medium barrel is connected to a combined medium pump, and the outlet of the combined medium pump is connected to the cyclone through a pipeline; a water supply pipe is connected to the outlet of the combined medium pump on the pipeline, and a water supply valve is installed on the water supply pipe. A density meter is also installed on the pipeline; the combined medium pump, the water supply valve and the density meter are all electrically connected to the PLC controller; During the intelligent medium addition process, the PLC controller links the water supply valve according to the density value detected by the densitometer, controls the opening of the water supply valve and keeps the detected density value within the set density fluctuation range.

4. The system for intelligent medium addition in coal preparation according to claim 3, characterized in that, When production is stopped, the PLC controller calculates the second weight of heavy medium that needs to be added when the liquid level in the combined medium barrel reaches the set upper limit threshold based on the current liquid level in the combined medium barrel, and starts the Z-type elevator and feeder in sequence to add the second weight of heavy medium into the combined medium barrel.

5. The system for intelligent medium addition in coal preparation as claimed in claim 1, wherein A gate valve is provided at the discharge port of the Z-type elevator, and the gate valve is electrically connected to the PLC controller.

6. The system for intelligent medium addition in coal preparation according to claim 2, wherein, The PLC controller establishes a closed-loop communication with the heavy medium intelligent sorting ash control and tight control system to obtain the actual ash content of the clean coal sorted by the heavy medium intelligent sorting ash control and tight control system, calculate the difference between the actual ash content and the target ash content, and adjust the suspension density required for production based on the calculated difference and then adjust the amount of added medium.

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