Anti-blocking ash conveying device for power generation of thermal power plant

Abstract

The invention provides an anti-blocking ash conveying device for power generation of a thermal power plant, which comprises an ash conveying pipe and a pneumatic device, and the pneumatic device is communicated with the ash conveying pipe; the ash hopper box is communicated with the ash conveying pipe through the screening box, a scraping plate assembly and a drying assembly are arranged in the ash hopper box, and a screening assembly and a smashing assembly are arranged in the screening box. Coal ash in the ash bucket box is heated and dried through the drying assembly in the ash bucket box, and the coal ash is prevented from making contact with moisture and caking; meanwhile, coal ash attached to the inner wall of the ash hopper box is cleaned away through a scraper assembly, the scraped coal ash is conveyed to a screening assembly in a screening box after being stirred, small-particle coal ash falls to an ash conveying pipe after being screened, and large-particle coal ash is left on the screening assembly and smashed into small-particle coal ash through a smashing assembly and then falls to the ash conveying pipe; and large particles are prevented from blocking and abrading the pipeline.

Description

Technical Field

[0001] This invention relates to the field of power plant ash conveying systems, and in particular to an anti-clogging ash conveying device for power generation in thermal power plants. Background Technology

[0002] A thermal power plant is an important energy facility that generates heat by burning combustible materials such as coal and converts that heat into electrical energy. During the coal combustion process, the non-combustible components in the coal form ash and slag, which are generally divided into fly ash (i.e., fly ash) and slag. Fly ash particles are hard and easily become airborne, requiring collection and treatment through a specialized ash removal system.

[0003] Currently, common ash removal methods include hydraulic ash removal, mechanical ash removal, and pneumatic ash removal. Among them, pneumatic ash removal is widely used due to its high conveying efficiency, flexible layout, and wide applicability. It mainly relies on ash conveying devices to transport fly ash to designated storage or treatment locations.

[0004] However, due to its strong hygroscopic capacity, fly ash easily absorbs moisture from the air in ash hoppers or conveying pipelines, leading to damp agglomeration. These agglomerated ash clumps, due to their large weight, tend to settle inside the pipelines during transport, causing blockages over time, affecting the normal operation of the ash conveying system, and reducing equipment efficiency and stability. Summary of the Invention

[0005] The purpose of this invention is to provide an anti-clogging ash conveying device for power generation in thermal power plants, which can prevent coal ash from agglomerating and is easier to transport in the ash conveying pipeline without clogging. This invention provides an anti-clogging ash conveying device for power generation in thermal power plants, comprising: an ash conveying pipe and a pneumatic device, wherein the pneumatic device is connected to the ash conveying pipe; an ash hopper and a screening box, wherein the ash hopper is connected to the ash conveying pipe through the screening box, the ash hopper is provided with a scraper assembly and a drying assembly, and the screening box is provided with a screening assembly and a crushing assembly.

[0006] Furthermore, it also includes a conveying pipe that connects the ash hopper and the screening box, and a spiral feeding rod is provided inside the conveying pipe.

[0007] Furthermore, the scraper assembly includes a stirring shaft, stirring rods, and scrapers. One end of the stirring shaft extends out of the ash hopper and connects to the drive assembly. A plurality of stirring rods are spaced apart and connected to the stirring shaft. The scrapers are connected to the ends of the stirring rods away from the stirring shaft and abut against the inner side of the ash hopper.

[0008] Furthermore, the bottom ash discharge port of the ash hopper is connected to the conveying pipe, the spiral feeding rod is provided with spiral blades, and the upper end of the spiral feeding rod is connected to the stirring shaft through a one-way linkage assembly; the speed at which the spiral feeding rod conveys coal ash is less than the speed at which the screening screen screens coal ash, and the inner diameter of the conveying pipe is less than the inner diameter of the screening box.

[0009] Furthermore, the one-way linkage assembly includes a sealed box and a one-way bearing. The sealed box is connected to the inner wall of the ash hopper box via a support rod. The one-way bearing is rotatably installed inside the sealed box. The screw feed rod and the stirring shaft extend into the sealed box and are connected to the one-way bearing, respectively.

[0010] Furthermore, the drying assembly includes a heating chamber and a heating wire. The heating chamber is arranged in a ring shape on the inner side wall of the ash hopper, and the heating wire is disposed inside the heating chamber.

[0011] Furthermore, the screening assembly includes a chute, springs, a screen, a dustproof ring, a dustproof motor housing, and a vibration motor; the chute is formed on the inner wall of the screening box, the outer edge of the screen is embedded in the chute, multiple springs are spaced apart in the chute and abut against the chute and the screen, the dustproof ring is connected to the upper and lower end faces of the screen and slides in contact with the inner wall of the screening box, the dustproof motor housing is connected to the bottom of the screen, and the vibration motor is disposed in the dustproof motor housing and connected to the screen.

[0012] Furthermore, the crushing assembly includes a rotating rod, crushing blades, and a drive assembly. The crushing blades are connected to the rotating rod and located on the upper side of the screening screen, while the drive assembly is located outside the screening box and connected to the rotating rod.

[0013] Furthermore, it also includes a controller, and the inside of the ash hopper is equipped with a humidity sensor for detecting the moisture content of the coal ash. The top of the screening box is fixedly connected to an ultrasonic sensor for detecting the height of coal ash accumulation in the screening box. The controller is connected to the ultrasonic sensor, the humidity sensor, the drying assembly, the drive assembly, and the pneumatic device, respectively.

[0014] The present invention also provides a method for ash conveying in an anti-clogging ash conveying device for power generation in a thermal power plant, comprising the following steps: Step 1: The humidity sensor detects the humidity of the coal ash inside the ash hopper and transmits it to the controller. Then, the controller activates the heating wire to heat the coal ash inside the ash hopper to dry it. At the same time, the drive assembly is activated to drive the stirring shaft to push the stirring rod to stir the coal ash, so that the dried coal ash and the undried coal ash are evenly mixed. The coal ash in contact with the inner wall of the ash hopper is continuously dried, which speeds up the drying process and prevents the coal ash from coming into contact with moisture, which would cause the coal ash to clump. Step 2: The controller starts the drive assembly to drive the stirring shaft to rotate in the opposite direction. The reverse rotation of the stirring shaft drives the scraper to rotate through the stirring rod, so that the scraper cleans away the coal ash adhering to the inner wall of the ash hopper. At the same time, the reverse rotation of the stirring shaft drives the spiral feeding rod to rotate through the one-way bearing, which in turn drives the spiral blades to rotate, so that the spiral blades transport the coal ash inside the ash hopper to the inside of the screening box. Step 3: The coal ash is conveyed to the screening screen, and then the vibration motor is started to drive the screening screen to move up and down, screening out large particles. At the same time, the ultrasonic sensor detects the height of the coal ash accumulation inside the screening box and transmits it to the controller. The controller compares the coal ash height with a preset threshold. When the coal ash height is greater than or equal to the preset threshold, the controller controls the drive component of the ash hopper to stop rotating, stopping the coal ash from being conveyed into the screening box. At the same time, the drive component of the screening box is started to drive the rotating rod to rotate, which in turn drives the crushing blades to rotate, so that the crushing blades crush the large particles. Then the crushed large particles fall through the screening screen into the ash conveying pipe and are carried away by the gas conveyed by the pneumatic device.

[0015] The technical solution of this invention uses a drying component in the ash hopper to heat and dry the coal ash inside the ash hopper, preventing the coal ash from contacting moisture and clumping. At the same time, a scraper component removes the coal ash adhering to the inner wall of the ash hopper. The scraped coal ash is stirred and then conveyed to a screening component in a screening box, so that small coal ash particles are screened and fall into the ash conveying pipe, while large coal ash particles remain on the screening component and are crushed into small coal ash particles by the crushing component before falling into the ash conveying pipe, thus preventing large particles from clogging and abrading the pipe. Attached Figure Description

[0016] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0017] Figure 1 This is a schematic diagram of the overall system structure of the present invention; Figure 2 This is a schematic diagram of the internal structure of the ash hopper box of the present invention; Figure 3 This is a schematic diagram of the internal structure of the screening box of the present invention; Figure 4 This is a cross-sectional view of the screening box of the present invention; Figure 5 This is a schematic diagram of the internal structure of the screening box and conveying pipe of the present invention; Explanation of reference numerals in the attached figures: 1. Base; 2. Support frame; 3. Ash hopper; 4. Heating chamber; 5. Heating wire; 6. Stirring shaft; 61. First bevel gear; 62. Second bevel gear; 63. First motor; 7. Stirring rod; 8. Scraper; 9. Sealing box; 10. One-way bearing; 11. Spiral feed rod; 12. Spiral blade; 13. Conveying pipe; 14. Screening box; 15. Slide chute; 16. Spring; 17. Screening mesh; 18. Dustproof ring; 19. Dustproof motor box; 20. Vibrating motor; 21. Rotating rod; 22. Crushing blade; 23. Third bevel gear; 24. Dustproof transmission box; 25. Fourth bevel gear; 26. Rotating rod; 27. Second motor; 28. Connecting pipe; 29. ​​Ash conveying pipe; 30. Gasification jet pump. Detailed Implementation

[0018] The technical solution of the present invention will be clearly and completely described below with reference to the embodiments. 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.

[0019] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," and "counterclockwise," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention 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 limiting this invention.

[0020] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the stated features. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified. Furthermore, the terms "installed," "connected," and "linked" should be interpreted broadly; for example, they may refer to a fixed connection, a detachable connection, or an integral connection; they may refer to a mechanical connection or an electrical connection; they may refer to a direct connection or an indirect connection through an intermediate medium; and they may refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0021] Example 1 like Figures 1-5As shown, the present invention provides an anti-clogging ash conveying device for power generation in thermal power plants, including a base 1, a support frame 2 fixedly connected to the top of the base 1, and an ash hopper 3 fixedly connected inside the support frame 2. The inner wall of the ash hopper 3 is made of aluminum alloy material to transfer the heat emitted by the heating wire 5. A drying component for heating coal ash is installed inside the ash hopper 3. The drying component includes a heating chamber 4 opened inside the ash hopper 3 and heating wires 5. The heating wires 5 are arranged at equal intervals inside the heating chamber 4. By setting the heating wires 5, the coal ash inside the ash hopper 3 is dried by the heating wires 5, thereby removing the moisture from the coal ash.

[0022] In this application, a stirring shaft 6 is rotatably connected inside the ash hopper 3. A drive assembly for driving the stirring shaft 6 to rotate is installed at one end of the stirring shaft 6 that passes through the ash hopper 3. The drive assembly includes a first bevel gear 61, a second bevel gear 62, and a first motor 63. The end of the stirring shaft 6 that passes through the ash hopper 3 is fixedly connected to a stirring rod 7. The stirring rod 7 is meshed with a scraper 8. The interior of the scraper 8 is connected to the conveying shaft of the sealed box 9. Stirring rods 7 are fixedly connected at equal intervals on the surface of the stirring shaft 6. The end of the stirring rod 7 away from the stirring shaft 6 is fixedly connected to a part inside the ash hopper 3. The scraper 8 is in contact with the wall. By setting up a first bevel gear 61, a second bevel gear 62, a first motor 63, a stirring shaft 6, a stirring rod 7, and a scraper 8, the first motor 63 drives the second bevel gear 62 to rotate, the second bevel gear 62 drives the first bevel gear 61 to rotate, the first bevel gear 61 drives the stirring shaft 6 to rotate, and the stirring shaft 6 drives the stirring rod 7 to stir the coal ash. The dried coal ash and the undried coal ash are stirred evenly, so that the undried coal ash comes into contact with the inner wall of the ash hopper box 3, and the heating wire 5 continuously heats the coal ash.

[0023] In this application, the bottom ash discharge port of the ash hopper 3 is connected to a conveying pipe 13. The inside of the conveying pipe 13 is provided with a spiral feeding rod 11. Spiral blades 12 are fixedly connected to the surface of the spiral feeding rod 11, and the spiral blades 12 are rotatably connected to the conveying pipe 13. A one-way linkage assembly is installed between the spiral feeding rod 11 and the stirring shaft 6. When the stirring shaft 6 rotates clockwise, it can drive the spiral feeding rod 11 to rotate through the one-way linkage assembly. When the stirring shaft 6 rotates counterclockwise, it does not drive the spiral feeding rod 11 to rotate through the one-way linkage assembly. The one-way linkage assembly includes a sealing box 9 and a one-way bearing 10. The support rod of the sealing box 9 is fixedly connected to the inner wall of the ash hopper 3, and the bottom of the ash hopper 3 is rotatably connected to the spiral feeding rod 11. The top of the ash hopper 3 is rotatably connected to the stirring shaft 6. The one-way bearing 10 is fixedly installed at the top of the spiral feeding rod 11, and the inside of the one-way bearing 10 is rotatably connected to the stirring shaft 6. In this application, the bottom of the conveying pipe 13 is connected to a screening box 14. The diameter of the conveying pipe 13 is smaller than the diameter of the screening box 14, allowing the screening box 14 to hold a large amount of coal ash. The screening box 14 is equipped with a screening assembly for screening out large particles from the coal ash. The screening assembly includes a chute 15, springs 16, a screen 17, a dustproof ring 18, a dustproof motor box 19, and a vibrating motor 20, all located inside the screening box 14. One end of each spring 16 is fixedly connected to the inner wall of the chute 15, and the springs 16 are arranged at equal intervals inside the chute 15. The top of each spring 16 is fixedly connected to the bottom edge of the screen 17. The speed at which the spiral blades 12 convey the coal ash is less than the speed at which the screen 17 filters the coal ash. The speed allows the screen 17 to quickly screen out large particles in the coal ash. The edge of the screen 17 is fixedly connected to the dustproof ring 18, which is slidably connected to the inner wall of the screening box 14 to prevent coal ash from entering the interior of the chute 15. The bottom center of the screen 17 is fixedly connected to the vibration motor 20. The dustproof motor box 19 covers the surface of the vibration motor 20, and the top of the dustproof motor box 19 is fixedly connected to the bottom of the screen 17. By setting up the chute 15, spring 16, screen 17, dustproof ring 18, dustproof motor box 19, and vibration motor 20, the vibration motor 20 is started to drive the screen 17 to vibrate up and down in the chute 15 (in conjunction with the spring 16).

[0024] In this application, a crushing assembly is provided on the top of the screening screen 17. The crushing assembly includes a rotating rod 21, a crushing blade 22, a third bevel gear 23, a dustproof transmission box 24, a fourth bevel gear 25, a rotating rod 26, and a second motor 27 located above the screening screen 17. The bottom surface of the rotating rod 21 is fixedly connected to the crushing blade 22, and the top of the rotating rod 21 is rotatably connected to the dustproof transmission box 24. One end of the rotating rod 21 that passes through the third bevel gear 23 is fixedly connected to the third bevel gear 23. The third bevel gear 23 is meshed with the fourth bevel gear 25. The rotating rod 26 is fixedly connected inside the fourth bevel gear 25, and the rotating rod 26 is rotatably connected to the dustproof transmission box 24. The connecting rod of the dustproof transmission box 24 is fixedly connected to the inner wall of the screening box 14. One end of the rotating rod 26 that passes through the screening box 14 is connected to the conveying shaft of the second motor 27, and the surface of the rotating rod 26 is rotatably connected to the screening box 14. In this application, the bottom of the screening box 14 is connected to a connecting pipe 28, the bottom of the connecting pipe 28 is connected to a conveying pipe 29, and a gasification jet pump 30 (pneumatic device) fixedly installed on the base 1 is installed inside the conveying pipe 29. The conveying pneumatic force is provided by setting the gasification jet pump 30. In this application, a controller is fixedly connected to the top of the base 1. A capacitive humidity sensor for detecting the moisture content of coal ash is installed inside the ash hopper 3. An ultrasonic sensor for detecting the height of coal ash accumulation in the screening box 14 is fixedly connected to the top of the screening box 14. The controller is electrically connected to the ultrasonic sensor, the capacitive humidity sensor, the heating wire 5, the first motor 63, the vibration motor 20, the second motor 27, and the gasification jet pump 30. By setting up the controller, ultrasonic sensor, capacitive humidity sensor, heating wire 5, first motor 63, vibration motor 20, second motor 27, and gasification jet pump 30, the humidity of coal ash inside the ash hopper 3 detected by the capacitive humidity sensor is transmitted to the controller, enabling the controller to detect the moisture in the coal ash in real time. The height of coal ash accumulation inside the screening box 14 is detected by the ultrasonic sensor and transmitted to the controller. The controller compares the coal ash height value with a preset threshold to detect the number of large particles in the coal ash on the screening screen 17.

[0025] The implementation principle of the anti-clogging ash conveying device for power generation in a thermal power plant according to an embodiment of this application is as follows: The humidity of the coal ash inside the ash hopper 3 is detected by a capacitive humidity sensor and transmitted to the controller. Then, the controller starts the heating wire 5 to heat the coal ash inside the ash hopper 3 to dry the coal ash. At the same time, the first motor 63 is started to drive the stirring shaft 6 through the second bevel gear 62 and the first bevel gear 61 to push the stirring rod 7 to stir the coal ash, so that the dried coal ash and the undried coal ash are evenly mixed. The coal ash in contact with the inner wall of the ash hopper 3 is continuously dried, which speeds up the drying of the coal ash and prevents the coal ash from contacting moisture and causing the coal ash to clump. Furthermore, the controller starts the first motor 63 to rotate in reverse. The first motor 63 rotates in reverse, which drives the stirring shaft 6 to rotate in reverse through the second bevel gear 62 and the first bevel gear 61. The rotation of the stirring shaft 6 in reverse drives the scraper 8 to rotate through the stirring rod 7, so that the scraper 8 cleans away the coal ash adhering to the inner wall of the ash hopper box 3. At the same time, the rotation of the stirring shaft 6 in reverse drives the spiral feeding rod 11 to rotate through the one-way bearing 10. The rotation of the spiral feeding rod 11 drives the spiral blade 12 to rotate, so that the spiral blade 12 transports the coal ash inside the ash hopper box 3 to the inside of the screening box 14. Next, the coal ash is conveyed to the screening screen 17, and then the vibration motor 20 is started to drive the screening screen 17 to move up and down, screening out large particles. At the same time, the ultrasonic sensor detects the height of the coal ash accumulation inside the screening box 14 and transmits it to the controller. The controller compares the coal ash height with a preset threshold. When the coal ash height is greater than or equal to the preset threshold, the controller controls the first motor 63 to stop rotating, stopping the coal ash from being conveyed into the screening box 14. At the same time, the second motor 27 is started to drive the rotating rod 26 to rotate. The rotation of the rotating rod 26 drives the fourth bevel gear 25 and the third bevel gear 23 to drive the rotating rod 21 to rotate. The rotation of the rotating rod 21 drives the crushing blade 22 to rotate, so that the crushing blade 22 crushes the large particles. Then the crushed large particles fall through the screening screen 17 into the connecting pipe 28, and then fall into the ash conveying pipe 29, and are then carried away by the gas conveyed by the gasification jet pump 30.

[0026] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A clog-resistant ash conveying device for power generation in a thermal power plant, characterized in that, include: A conveying pipe and a pneumatic device, wherein the pneumatic device is connected to the conveying pipe; The ash hopper and the screening box are connected to the ash conveying pipe through the screening box. The ash hopper is equipped with a scraper assembly and a drying assembly, and the screening box is equipped with a screening assembly and a crushing assembly.

2. The anti-clogging ash conveying device for thermal power plant generation according to claim 1, characterized in that, It also includes a conveying pipe that connects the ash hopper and the screening box, and a spiral feeding rod is provided inside the conveying pipe.

3. The anti-clogging ash conveying device for thermal power plant generation according to claim 2, characterized in that, The scraper assembly includes a stirring shaft, stirring rods, and scrapers. One end of the stirring shaft extends out of the ash hopper and connects to a drive assembly. A plurality of stirring rods are spaced apart and connected to the stirring shaft. The scrapers are connected to the ends of the stirring rods away from the stirring shaft and abut against the inner side of the ash hopper.

4. The anti-clogging ash conveying device for thermal power plant generation according to claim 3, characterized in that, The bottom ash discharge port of the ash hopper is connected to the conveying pipe, the spiral feeding rod is provided with spiral blades, and the upper end of the spiral feeding rod is connected to the stirring shaft through a one-way linkage assembly. The speed at which the spiral feeder conveys coal ash is less than the speed at which the screen screens coal ash, and the inner diameter of the conveying pipe is less than the inner diameter of the screen box.

5. The anti-clogging ash conveying device for thermal power plant generation according to claim 4, characterized in that, The one-way linkage assembly includes a sealed box and a one-way bearing. The sealed box is connected to the inner wall of the ash hopper box via a support rod. The one-way bearing is rotatably installed inside the sealed box. The screw feed rod and the stirring shaft extend into the sealed box and are connected to the one-way bearing, respectively.

6. The anti-clogging ash conveying device for thermal power plant generation according to claim 1, characterized in that, The drying assembly includes a heating chamber and a heating wire. The heating chamber is arranged in a ring shape on the inner side wall of the ash hopper, and the heating wire is disposed inside the heating chamber.

7. The anti-clogging ash conveying device for thermal power plant generation according to claim 1, characterized in that, The screening assembly includes a chute, a spring, a screening mesh, a dustproof ring, a dustproof motor housing, and a vibration motor; The chute is formed on the inner wall of the screening box, the outer edge of the screening mesh is embedded in the chute, multiple springs are arranged at intervals in the chute and abut against the chute and the screening mesh, the dustproof ring is connected to the upper and lower end faces of the screening mesh and slides in contact with the inner wall of the screening box, the dustproof motor box is connected to the bottom of the screening mesh, and the vibration motor is set in the dustproof motor box and connected to the screening mesh.

8. The anti-clogging ash conveying device for thermal power plant generation according to claim 7, characterized in that, The crushing assembly includes a rotating rod, crushing blades, and a drive assembly. The crushing blades are connected to the rotating rod and located on the upper side of the screening screen, while the drive assembly is located outside the screening box and connected to the rotating rod.

9. The anti-clogging ash conveying device for thermal power plant generation according to claim 1, characterized in that, It also includes a controller. The ash hopper is equipped with a humidity sensor for detecting the moisture content of coal ash. The top of the screening box is fixedly connected to an ultrasonic sensor for detecting the height of coal ash accumulation in the screening box. The controller is connected to the ultrasonic sensor, the humidity sensor, the drying assembly, the drive assembly, and the pneumatic device.

10. A method for conveying ash in an anti-clogging ash conveying device for power generation in a thermal power plant as described in any one of claims 1-9, characterized in that, Includes the following steps: Step 1: The humidity sensor detects the humidity of the coal ash inside the ash hopper and transmits it to the controller. Then, the controller activates the heating wire to heat the coal ash inside the ash hopper to dry it. At the same time, the drive assembly is activated to drive the stirring shaft to push the stirring rod to stir the coal ash, so that the dried coal ash and the undried coal ash are evenly mixed. The coal ash in contact with the inner wall of the ash hopper is continuously dried, which speeds up the drying process and prevents the coal ash from coming into contact with moisture, which would cause the coal ash to clump. Step 2: The controller starts the drive assembly to drive the stirring shaft to rotate in the opposite direction. The reverse rotation of the stirring shaft drives the scraper to rotate through the stirring rod, so that the scraper cleans away the coal ash adhering to the inner wall of the ash hopper. At the same time, the reverse rotation of the stirring shaft drives the spiral feeding rod to rotate through the one-way bearing, which in turn drives the spiral blades to rotate, so that the spiral blades transport the coal ash inside the ash hopper to the inside of the screening box. Step 3: The coal ash is conveyed to the screening screen, and then the vibration motor is started to drive the screening screen to move up and down, screening out large particles. At the same time, the ultrasonic sensor detects the height of the coal ash accumulation inside the screening box and transmits it to the controller. The controller compares the coal ash height with a preset threshold. When the coal ash height is greater than or equal to the preset threshold, the controller controls the drive component of the ash hopper to stop rotating, stopping the coal ash from being conveyed into the screening box. At the same time, the drive component of the screening box is started to drive the rotating rod to rotate, which in turn drives the crushing blades to rotate, so that the crushing blades crush the large particles. Then the crushed large particles fall through the screening screen into the ash conveying pipe and are carried away by the gas conveyed by the pneumatic device.

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