Anti-blocking coal dropping pipe of coal mill

Abstract

The utility model discloses an anti-blocking coal dropping pipe of a coal mill, and relates to the technical field of anti-blocking devices. The pipe comprises a pipe body, the connecting pipe penetrates through and is fixed on the peripheral side surface of the pipe body and points to the circle center; the gas conveying pipe is coaxially and rotationally arranged on the inner wall of the connecting pipe; the impeller is fixed at the outer end of the gas pipe; the annular scraper is fixed to the inner end of the air conveying pipe, the outer edge of the annular scraper is in sliding contact with the inner wall of the pipe body, a cavity communicated with the air conveying pipe is formed in the annular scraper, and a plurality of air blowing pipes communicated with the cavity are evenly distributed on the outer surface of the annular scraper in the circumferential direction. Gas is conveyed into the gas conveying pipe to drive the impeller to rotate, then the gas conveying pipe and the annular scraping plate are driven to rotate synchronously to conduct rotary scraping, meanwhile, the gas can be sprayed out of the gas blowing pipe in the radial direction to conduct airflow scouring, and wet coal is prevented from adhering to the inner wall of the pipe body to cause blocking. And therefore, double cleaning of mechanical scraping and airflow scouring is synchronously realized through gas.

Description

Technical Field

[0001] This utility model belongs to the technical field of anti-blocking devices, and in particular relates to an anti-blocking coal drop pipe for a coal mill. Background Technology

[0002] In coal mill systems, the coal chute serves as a crucial channel for pulverized coal transportation, and its internal structural design and anti-clogging performance directly impact equipment operating efficiency and stability. Traditional technologies address the issue of pulverized coal adhesion and accumulation by optimizing the smoothness of the pipe's inner wall, adjusting the inclination angle, or adding vibration devices to alleviate blockages. Furthermore, some solutions employ wear-resistant material linings or introduce auxiliary anti-clogging structures to reduce pulverized coal retention and extend pipe lifespan.

[0003] Currently, in existing technologies, unclogging devices and airflow-assisted systems often operate independently, making it difficult to coordinate mechanical scraping and airflow scouring actions, thus limiting unclogging efficiency. Fixed unclogging structures, due to their fixed coverage area, cannot adapt to the uneven distribution of coal accumulation on the pipe wall; while static airflow injection has a single direction, easily creating local dead zones, and the nozzles are prone to clogging and failure due to long-term exposure to a high-concentration coal dust environment. In addition, the uneven distribution of contact pressure between traditional scraping components and the pipe wall can accelerate wear or create gaps, weakening the seal and affecting airflow stability, making it difficult to meet the requirements of long-term anti-clogging and low-maintenance operation.

[0004] To address these issues, we provide an anti-clogging coal drop pipe for a coal mill. Utility Model Content

[0005] To solve the above-mentioned technical problems, this utility model is achieved through the following technical solution: This utility model is an anti-blocking coal chuting pipe for a coal mill, comprising...

[0006] The tube body is designed as a spherical shell with both the top and bottom cut flat;

[0007] A connecting pipe, which passes through and is fixed to the circumferential side of the pipe body and points toward its center, is used to transport gas;

[0008] The gas transmission pipe is coaxially rotatably mounted on the inner wall of the connecting pipe;

[0009] The impeller is fixed to the outer end of the gas delivery pipe;

[0010] The circular scraper is fixed to the inner end of the air supply pipe. Its outer edge maintains sliding contact with the inner wall of the pipe. Its interior forms a cavity that communicates with the air supply pipe, and its outer surface has multiple blowing pipes that communicate with the cavity evenly distributed along its circumference.

[0011] When gas enters from the outer end of the connecting pipe, it drives the impeller to rotate, which in turn drives the gas delivery pipe and the circular scraper to rotate and scrape synchronously. At the same time, after the gas enters the cavity through the gas delivery pipe, it is sprayed out radially from the blowing pipe to flush the airflow.

[0012] The present invention is further configured to include a rotary sealed bearing, which is disposed between the gas supply pipe and the connecting pipe, with its outer ring fitting against the inner wall of the connecting pipe and its inner ring fitting against the outer wall of the gas supply pipe.

[0013] The present invention is further configured such that the side of the annular scraper that is in contact with the inner wall of the pipe is a tip with a gradually decreasing thickness, which is used to improve the scraping force when scraping coal.

[0014] The present invention is further configured such that the air outlet end of the air blowing pipe does not come into contact with the inner wall of the pipe, and is configured as an L-shaped outer pipe, with a section away from the circular scraper being parallel to the diameter of the pipe body.

[0015] The present invention is further configured such that the outer surface of the circular scraper is coated with a layer of wear-resistant ceramic, and the gap between its outer edge and the inner wall of the tube is controlled within the range of 0.5-2mm.

[0016] The present invention has the following beneficial effects: 1. The present invention delivers gas into the gas pipe, drives the impeller to rotate, and then drives the gas pipe and the circular scraper to rotate synchronously for rotational scraping. At the same time, the gas is also sprayed radially from the gas blowing pipe for airflow flushing, preventing wet coal from adhering to the inner wall of the pipe and causing blockage. Thus, the gas synchronously achieves dual cleaning of mechanical scraping and airflow flushing.

[0017] 2. The circular scraper of this utility model is designed in a circular shape, with a through cavity in the middle that allows coal to pass through. Its rotation path covers the entire inner wall of the pipe, ensuring that coal on the entire inner wall of the pipe can be scraped off. The side of the circular scraper that is in contact with the inner wall of the pipe is designed as a tip with a gradually decreasing thickness to improve the scraping force when scraping coal. The outer surface of the circular scraper is coated with a layer of wear-resistant ceramic, which helps to improve the wear resistance of the circular scraper and extend its service life.

[0018] 3. The air blowing pipe of this utility model is arranged in a circumferential array on both sides of the circular scraper. Its air outlet points to the inner wall of the pipe and does not come into contact with the inner wall of the pipe. It is set as an L-shaped outer pipe, with the section away from the circular scraper parallel to the diameter of the pipe body. As a result, the gas blown out from the air outlet is perpendicular to the inner wall of the corresponding position of the pipe body, the impact force of the airflow is large, and thus the coal is subjected to a greater blowing force.

[0019] Of course, any product implementing this utility model does not necessarily need to achieve all of the advantages described above at the same time. Attached Figure Description

[0020] To more clearly illustrate the technical solutions of the embodiments of this utility model, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0021] Figure 1 This is a schematic diagram of the anti-clogging coal drop pipe of a coal mill.

[0022] Figure 2 For the present utility model Figure 1 Enlarged view of region A.

[0023] Figure 3 For the present utility model Figure 1 Enlarged view of region B.

[0024] Figure 4 For the present utility model Figure 1 Another perspective structural diagram.

[0025] Figure 5 For the present utility model Figure 4 Enlarged view of region C.

[0026] The attached diagram lists the components represented by each number as follows:

[0027] 1. Pipe body; 2. Connecting pipe; 3. Gas delivery pipe; 4. Impeller; 5. Circular scraper; 6. Cavity; 7. Air blowing pipe; 8. Rotary sealing bearing. Detailed Implementation

[0028] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model. Specific Implementation

[0030] Please see Figure 1 , Figure 4 This utility model is an anti-clogging coal feeding pipe for a coal mill, including a pipe body 1, which is configured as a spherical shell with both the top and bottom flattened. The top of the pipe body 1 is connected to the coal feeder, and the bottom is connected to the coal mill. The coal feeder transports coal into the coal mill through the pipe body 1.

[0031] For further details, please refer to Figure 1-5Connecting pipe 2, which is fixed through the side of pipe body 1 and points to its center, is used to transport gas. Connecting pipe 2 is set horizontally, with one end extending out of the outer wall of pipe body 1 and connected to external gas transmission equipment.

[0032] The gas transmission pipe 3 is coaxially rotatably mounted on the inner wall of the connecting pipe 2. The end of the gas transmission pipe 3 away from the pipe body 1 is located inside the connecting pipe 2, and the end does not extend out of the connecting pipe 2.

[0033] Impeller 4 is fixed to the outer end of gas delivery pipe 3. The position of impeller 4 does not extend beyond the outer end of connecting pipe 2. When the gas delivery equipment delivers gas into the connecting pipe 2, it fanns impeller 4 to rotate, thereby driving gas delivery pipe 3 to rotate.

[0034] The rotary sealed bearing 8 is located between the air supply pipe 3 and the connecting pipe 2. Its outer ring is in contact with the inner wall of the connecting pipe 2, and its inner ring is in contact with the outer wall of the air supply pipe 3. It supports the rotation of the air supply pipe 3 and reduces friction through rolling elements (steel balls, rollers, etc.) to ensure smooth operation.

[0035] The circular scraper 5 is fixed to the inner end of the gas transmission pipe 3. The circular scraper 5 is circular in shape, with a through cavity in the middle that allows coal to pass through. The annular scraper on the periphery is attached to the inner wall of the pipe body 1, and its rotation path covers the entire inner wall of the pipe body 1, ensuring that coal on the entire inner wall of the pipe body 1 can be scraped off. The side of the circular scraper 5 that is attached to the inner wall of the pipe body 1 is set as a tip with gradually decreasing thickness to improve the scraping force when scraping coal. The outer surface of the circular scraper 5 is coated with a layer of wear-resistant ceramic, which helps to improve the wear resistance of the circular scraper 5 and extend its service life. The gap between its outer edge and the inner wall of the pipe body 1 is controlled within the range of 0.5-2mm to prevent the circular scraper 5 from being overly attached to the inner wall of the pipe body 1 and having excessive friction, or the circular scraper 5 being too far from the inner wall of the pipe body 1 and having no scraping force for coal, thereby improving the degree of coal scraping.

[0036] When gas enters from the outer end of the connecting pipe 2, it drives the impeller 4 to rotate, which in turn drives the gas delivery pipe 3 and the circular scraper 5 to rotate and scrape synchronously, preventing wet coal from adhering to the inner wall of the pipe body 1 and causing blockage, thus affecting the coal feeding.

[0037] For further details, please refer to Figure 1-5The outer edge of the circular scraper 5 maintains sliding contact with the inner wall of the pipe body 1, and a cavity 6 is formed inside it that communicates with the gas delivery pipe 3. The cavity 6 can transport gas and also reduce the weight of the circular scraper 5 itself, saving material costs. Multiple air blowing pipes 7 that communicate with the cavity 6 are evenly distributed around the outer surface of the circular scraper 5. The air blowing pipes 7 are arranged in a circular array on both sides of the circular scraper 5, with their air outlets pointing towards the inner wall of the pipe body 1 and not in close contact with the inner wall of the pipe body 1. They are set as L-shaped outer pipes, with the section away from the circular scraper 5 parallel to the diameter of the pipe body 1. Thus, the gas blown out from the air outlet is perpendicular to the inner wall of the corresponding position of the pipe body 1, resulting in a large impact force of the airflow and a greater blowing force on the coal.

[0038] When gas enters from the outer end of the connecting pipe 2, it enters the cavity 6 through the gas delivery pipe 3 and is then radially ejected from the blowing pipe 7 to scour the coal. The airflow creates an impact force on the coal on the inner wall of the pipe body 1. The coal becomes loose due to being scraped by the circular scraper 5. Combined with the impact of the airflow, this increases the probability of the coal leaving the inner wall of the pipe body 1, further improving the coal scraping efficiency.

[0039] In the description of this specification, references to terms such as "an embodiment," "example," "specific example," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0040] The preferred embodiments of this utility model disclosed above are merely illustrative of the present utility model. These preferred embodiments do not exhaustively describe all details, nor do they limit the utility model to the specific implementations described. Clearly, many modifications and variations can be made based on the content of this specification. This specification selects and specifically describes these embodiments to better explain the principles and practical applications of this utility model, thereby enabling those skilled in the art to better understand and utilize it. This utility model is limited only by the claims and their full scope and equivalents.

Claims

1. A mill plugging prevention coal pipe of a coal mill, characterized by: Comprising a tube body (1) arranged as a spherical shell with both upper and lower sides being flat; a connecting tube (2) fixed through the side of the tube body (1) and pointing to the center of the tube body (1) for conveying gas; a gas conveying tube (3) coaxially arranged in the inner wall of the connecting tube (2); an impeller (4) fixed at the outer end of the gas conveying tube (3); a circular scraper (5) fixed at the inner end of the gas conveying tube (3), the outer edge of which is in sliding contact with the inner wall of the tube body (1), and the inside of which forms a cavity (6) in communication with the gas conveying tube (3), and the outer surface of which is uniformly distributed with a plurality of gas blowing tubes (7) in communication with the cavity (6) along the circumferential direction; wherein when the gas enters from the outer end of the connecting tube (2), the impeller (4) is driven to rotate, thereby driving the gas conveying tube (3) and the circular scraper (5) to rotate synchronously for rotary scraping, and at the same time, the gas entering the cavity (6) through the gas conveying tube (3) is radially sprayed from the gas blowing tube (7) for airflow scouring.

2. The anti-blocking coal pipe of the coal mill according to claim 1, characterized in that further comprising a rotating sealing bearing (8) arranged between the gas conveying tube (3) and the connecting tube (2), the outer ring of which is in contact with the inner wall of the connecting tube (2), and the inner ring of which is in contact with the outer wall of the gas conveying tube (3).

3. The anti-blocking coal pipe of the coal mill according to claim 2, characterized in that one side of the circular scraper (5) in contact with the inner wall of the tube body (1) is arranged as a tapered tip with gradually decreasing thickness, for improving the scraping force when scraping coal.

4. The anti-blocking coal pipe of the coal mill according to claim 3, characterized in that the gas outlet end of the gas blowing tube (7) is not in contact with the inner wall of the tube body (1), and is arranged as an L-shaped outer tube, the segment away from the circular scraper (5) being arranged parallel to the diameter of the tube body (1).

5. The anti-blocking coal pipe of the coal mill according to claim 4, characterized in that the outer surface of the circular scraper (5) is coated with a layer of wear-resistant ceramic, and the gap between the outer edge of the circular scraper (5) and the inner wall of the tube body (1) is controlled within the range of 0.5-2mm.

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