Scraper in air duct of medium-speed coal mill

Abstract

The utility model relates to the technical field of medium-speed coal mills, in particular to a scraper blade in an air duct of a medium-speed coal mill, which comprises a base and further comprises a mill body arranged at the top of the base and used for grinding coal briquettes, connecting plates are arranged on the front side and the rear side of the surface of the mill body, mounting holes are formed in the surfaces of the connecting plates, and the connecting plates are arranged in the mounting holes. A mounting plate is arranged on one side of the connecting plate; through cooperation of a connecting plate, a mounting plate and a second bolt, a worker can conveniently maintain and dismount the scraper body in the later period, the use strength and toughness of the scraper body can be improved through reinforcing ribs, the wear-resisting plate can be located in an inner cavity of the positioning shell through the wear-resisting plate, the wear-resisting plate plays a role in preventing materials from scouring the scraper body, and the service life of the scraper body is prolonged. And through cooperation of a first bolt, a locking gasket and a gear ring, the situation that the scraper body is affected by equipment operation to cause vibration, and consequently the abrasion-resistant plate is prone to loosening can be avoided.

Description

Technical Field

[0001] This utility model relates to the field of medium-speed coal mill technology, specifically to a scraper inside the air duct of a medium-speed coal mill. Background Technology

[0002] The pulverized coal mill currently in use at the ironmaking plant is a medium-speed pulverizer. During operation, raw coal enters the mill through the feed pipe at the top center. After grinding, the raw coal is dried by hot air entering through the sealing ring and then conveyed to the mill separator. Unqualified large particles fall back into the grinding zone for further grinding until they reach the appropriate particle size. The pulverized coal with the appropriate particle size is conveyed to the dust collector through the separator. Coal slag and impurities that cannot be ground are transferred to the air duct and discharged by scrapers. If the coal slag in the air duct cannot be discharged in time, it will directly affect the amount of hot air discharged from the sealing ring. Reduced air volume will reduce the mill's hourly output, increase the mill pressure differential, cause the blower to surge, and significantly extend the equipment's operating time, increasing energy consumption. If the scraper is intact, waste slag is discharged in time, and the secondary air volume at the sealing ring is sufficient, the powder output rate can be effectively improved.

[0003] There are two scrapers installed inside the mill, arranged diagonally. They are installed in the air duct of the lower casing of the mill. Due to long-term operation in a closed environment, the scrapers have repeatedly fallen off and deformed during daily operation due to the influence of production, the equipment itself, and the working environment. At the same time, they are severely affected by erosion and are not durable enough to withstand use, requiring frequent replacement. This seriously affects the normal production of the pulverized coal injection system. In order to ensure the normal and safe use of the mill, the scrapers need to be replaced frequently. However, the scraper replacement work space is small, the time is long, and the construction is difficult and risky.

[0004] Therefore, to address the above issues, we need to propose a scraper for the air duct of a medium-speed coal mill. Utility Model Content

[0005] The purpose of this utility model is to provide a scraper inside the air duct of a medium-speed coal mill to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, this utility model provides the following technical solution: a scraper inside the air duct of a medium-speed coal mill, including a base, and further comprising:

[0007] A mill body for grinding coal blocks is installed on the top of the base. Connecting plates are provided on the front and rear sides of the surface of the mill body. The surface of the connecting plates is provided with mounting holes. A mounting plate is provided on one side of the connecting plates. A scraper body is provided on one side of the mounting plate. The scraper body and the mounting plate are integrally welded. A connecting hole is provided on the bottom of the surface of the scraper body.

[0008] Preferably, a reinforcing block is provided on one side of the surface of the scraper body, and one side of the reinforcing block is fixedly connected to the mounting plate.

[0009] Preferably, reinforcing ribs are fixedly connected to both the front and rear sides of the scraper body surface, and the reinforcing ribs are integrally welded to the scraper body.

[0010] Preferably, a positioning shell is provided at the bottom of the surface of the scraper body, a wear-resistant plate is provided in the inner cavity of the positioning shell, and an insertion hole is provided in the inner cavity of the positioning shell.

[0011] Preferably, a first bolt is inserted into the inner cavity of the insertion hole, a locking washer is fitted on the surface of the first bolt, and a toothed ring is provided on the rear side of the surface of the first bolt, the toothed ring engaging with the locking washer.

[0012] Preferably, the inner cavity of the mounting plate is threaded with a second bolt, and the surface of the second bolt is threaded with the inner cavity of the mounting hole.

[0013] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0014] This utility model, through the cooperation of the connecting plate, the mounting plate, and the second bolt, facilitates the maintenance and disassembly of the scraper body by the staff. The reinforcing ribs improve the strength and toughness of the scraper body. The wear-resistant plate, located in the inner cavity of the positioning shell, prevents materials from eroding the scraper body and extends its service life. The cooperation of the first bolt, the locking washer, and the toothed ring prevents the scraper body from vibrating due to the operation of the equipment, thus preventing the wear-resistant plate from loosening. Attached Figure Description

[0015] Figure 1 A schematic diagram of a preferred embodiment of the scraper inside the air duct of a medium-speed coal mill provided by this utility model;

[0016] Figure 2 This is a schematic diagram of the disassembled structure provided by the present invention;

[0017] Figure 3 A disassembled schematic diagram of the internal structure of the wear-resistant plate provided by this utility model;

[0018] Figure 4 A schematic diagram of the structure of the first bolt, locking washer, and gear ring provided for this utility model.

[0019] In the diagram: 1. Base; 2. Mill body; 3. Connecting plate; 4. Mounting plate; 5. Scraper body; 6. Connecting hole; 7. Reinforcing rib; 8. Reinforcing block; 9. Second bolt; 10. Positioning shell; 11. Wear-resistant plate; 12. Insertion hole; 13. First bolt; 14. Locking washer; 15. Gear ring. Detailed Implementation

[0020] To further illustrate the technical means and effects adopted by this utility model in order to achieve the intended utility model purpose, the following detailed description of the specific implementation methods, structure, features and effects of this utility model is provided in conjunction with the accompanying drawings and preferred embodiments.

[0021] Please see Figure 1-4 As shown, a scraper inside the air duct of a medium-speed coal mill includes a base 1. A mill body 2 for grinding coal is provided on the top of the base 1. Connecting plates 3 are provided on the front and rear sides of the surface of the mill body 2. The connecting plates 3 are located on the surface of the mill body 2 and their function is to facilitate the installation of the scraper body 5 by the operator. The surface of the connecting plates 3 is provided with mounting holes. The mounting holes are located on the surface of the connecting plates 3 and their function is to cooperate with the mounting plates 4 to install and position the scraper body 5. The mounting plates 4 are provided on one side of the connecting plates 3 and the scraper body 5 is provided on one side of the mounting plates 4. The scraper body 5 and the mounting plates 4 are integrally welded. A connecting hole 6 is provided on the bottom of the surface of the scraper body 5.

[0022] A reinforcing block 8 is provided on one side of the surface of the scraper body 5. The reinforcing block 8 is located on one side of the surface of the scraper body 5. Its function is to support and prevent breakage at the connection between the scraper body 5 and the mounting plate 4. One side of the reinforcing block 8 is fixedly connected to the mounting plate 4.

[0023] The front and rear sides of the scraper body 5 are fixedly connected with reinforcing ribs 7. The reinforcing ribs 7 can improve the toughness and strength of the scraper body 5. The reinforcing ribs 7 are integrally welded to the scraper body 5.

[0024] A positioning shell 10 is provided at the bottom of the surface of the scraper body 5. The positioning shell 10 is located on the surface of the scraper body 5 and its function is to protect the wear-resistant plate 11. The wear-resistant plate 11 is provided in the inner cavity of the positioning shell 10. The wear-resistant plate 11 is located in the inner cavity of the positioning shell 10 and its function is to prevent the material from scouring the scraper body 5. An insertion hole 12 is provided in the inner cavity of the positioning shell 10.

[0025] A first bolt 13 is inserted into the inner cavity of the insertion hole 12. The first bolt 13 is located in the inner cavity of the insertion hole 12. Its function is to cooperate with the locking washer 14 and the toothed ring 15 to prevent the wear plate 11 from loosening due to the operation of the scraper body 5. The locking washer 14 is sleeved on the surface of the first bolt 13. A toothed ring 15 is provided on the rear side of the surface of the first bolt 13. The toothed ring 15 is engaged with the locking washer 14.

[0026] The inner cavity of the mounting plate 4 is threaded with a second bolt 9. The second bolt 9 is located in the inner cavity of the mounting plate 4. Its function is to facilitate the operator to connect and position the mounting plate 4, the scraper body 5, and the connecting plate 3 of the mill body 2. The surface of the second bolt 9 is threaded with the inner cavity of the mounting hole.

[0027] Working principle: As the scraper body 5 moves with the mill body 2 to scrape away coal slag and impurities, the reinforcing block 8 first supports the connection between the scraper body 5 and the mounting plate 4, preventing weld breakage and bending of the scraper body 5. The reinforcing ribs 7 improve the strength of the scraper body 5, preventing deformation caused by prolonged exposure to production, equipment, and environmental conditions. Finally, the wear-resistant plate 11, located at the bottom of the scraper body 5 surface, is positioned closest to the coal and impurities, providing resistance to wear. The grinding plate 11 is made of chromium-nickel-tungsten alloy wear-resistant material, which can effectively resist the erosion of the scraper body 5 by the material, improve the wear resistance and service life of the scraper body 5. When the staff needs to maintain the scraper body 5 in the later stage, the scraper body 5 can be removed by unscrewing the second bolt 9 inside the mounting plate 4 from the inside of the connecting plate 3. When the wear-resistant plate 11 needs to be maintained, the first bolt 13 can be unscrewed from the inside of the scraper body 5 and removed together with the locking washer 14 to remove the wear-resistant plate 11, achieving the effect of quick maintenance.

[0028] The above description is merely a preferred embodiment of the present utility model and is not intended to limit the present utility model in any way. Although the present utility model has been disclosed above with reference to a preferred embodiment, it is not intended to limit the present utility model. Any person skilled in the art can make some modifications or alterations to the above-disclosed technical content to create equivalent embodiments without departing from the scope of the present utility model. Any simple modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of the present utility model without departing from the scope of the present utility model shall still fall within the scope of the present utility model.

Claims

1. A scraper inside the air duct of a medium-speed coal mill, comprising a base (1), characterized in that, Also includes: A mill body (2) is set on the top of the base (1) for grinding coal blocks. A connecting plate (3) is provided on the front and rear sides of the surface of the mill body (2). The surface of the connecting plate (3) is provided with mounting holes. A mounting plate (4) is provided on one side of the connecting plate (3). A scraper body (5) is provided on one side of the mounting plate (4). The scraper body (5) and the mounting plate (4) are integrally welded. A connecting hole (6) is provided at the bottom of the surface of the scraper body (5).

2. The scraper inside the air duct of a medium-speed coal mill according to claim 1, characterized in that: A reinforcing block (8) is provided on one side of the surface of the scraper body (5), and one side of the reinforcing block (8) is fixedly connected to the mounting plate (4).

3. The scraper inside the air duct of a medium-speed coal mill according to claim 1, characterized in that: The front and rear sides of the scraper body (5) are fixedly connected with reinforcing ribs (7), and the reinforcing ribs (7) are integrally welded to the scraper body (5).

4. The scraper inside the air duct of a medium-speed coal mill according to claim 1, characterized in that: A positioning shell (10) is provided at the bottom of the surface of the scraper body (5), and a wear-resistant plate (11) is provided in the inner cavity of the positioning shell (10). An insertion hole (12) is provided in the inner cavity of the positioning shell (10).

5. A scraper inside the air duct of a medium-speed coal mill according to claim 4, characterized in that: The inner cavity of the insertion hole (12) is fitted with a first bolt (13), and a locking washer (14) is fitted on the surface of the first bolt (13). A toothed ring (15) is provided on the rear side of the surface of the first bolt (13), and the toothed ring (15) is engaged with the locking washer (14).

6. A scraper inside the air duct of a medium-speed coal mill according to claim 1, characterized in that: The inner cavity of the mounting plate (4) is threaded with a second bolt (9), and the surface of the second bolt (9) is threaded with the inner cavity of the mounting hole.

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