A vane for a boiler coal mill

Abstract

The utility model belongs to the technical field of boiler coal mill, especially a blade for boiler coal mill, aiming at the problem that the existing coal mill blade is mostly fixed angle installation, cannot be adjusted flexibly according to actual working condition, and is difficult to meet the accurate control demand of coal fineness and ventilation volume when different coal kinds, different load and coal quality change, the present scheme is provided, it includes impeller, a plurality of mounting seat and a plurality of blade body, a plurality of mounting seat are all fixedly installed on the outside of impeller, a plurality of blade body are installed on a plurality of mounting seat respectively, the outside of protective cover is provided with thread, the utility model can be conveniently adjusted and quickly disassembled to blade angle, can control coal fineness and ventilation volume accurately according to different coal kinds and working condition, improves coal mill operating efficiency and adaptability, is convenient for maintenance simultaneously, simple structure, convenient to use.

Description

Technical Field

[0001] This application relates to the field of boiler coal mill technology, and in particular to a blade for a boiler coal mill. Background Technology

[0002] High-speed coal mills, also known as fan-driven coal mills, have a structure similar to that of a blower. They consist of a working impeller and a volute-shaped outer casing. The impeller has 8-12 blades called impact plates, and the inner wall of the volute is lined with armor. The mill outlet is a pulverized coal separator. High-speed coal mills function as both blowers and pulverizers. Raw coal is pulverized into coal powder by the impact and friction of the impact plates and the volute, and then blown into the furnace by a fan.

[0003] In existing technologies, coal mill blades are mostly installed at a fixed angle, which cannot be flexibly adjusted according to actual working conditions. This makes it difficult to meet the precise control requirements for coal powder fineness and ventilation volume when there are different coal types, different loads, and changes in coal quality. Therefore, we propose a blade for boiler coal mills to solve the above problems. Utility Model Content

[0004] The purpose of this invention is to address the shortcomings of existing coal mill blades, which are mostly installed at a fixed angle and cannot be flexibly adjusted according to actual working conditions, making it difficult to meet the precise control requirements for coal powder fineness and ventilation volume when different coal types, loads, and coal quality changes. Therefore, this invention proposes a blade for boiler coal mills.

[0005] The present application provides a blade for a boiler coal mill, which adopts the following technical solution:

[0006] A blade for a boiler coal mill, comprising:

[0007] An impeller, multiple mounting bases, and multiple blade bodies are provided, wherein the multiple mounting bases are fixedly mounted on the outside of the impeller, and the multiple blade bodies are respectively mounted on the multiple mounting bases.

[0008] The protective cover has an annular threaded groove on the impeller and a thread on the outer side of the protective cover, which is threadedly connected to the annular threaded groove.

[0009] The mounting cavity is located inside the impeller. A mounting base is fixedly installed on the outer side of the impeller. The mounting base has a through groove and an adjustment mechanism for adjusting the angle of the blade body.

[0010] Furthermore, a connecting block is fixedly installed on the top of each of the multiple mounting bases, and a slot is opened on the bottom of each of the multiple blade bodies, the slot engaging with the connecting block.

[0011] Furthermore, the inner wall of the mounting cavity is provided with a plurality of second through holes, and a rotating shaft is rotatably installed in each of the plurality of second through holes. The plurality of rotating shafts are rotatably connected to a plurality of mounting seats, and one end of the plurality of rotating shafts is fixedly connected to the outer side of a plurality of connecting blocks.

[0012] Furthermore, the gear ring is fixedly mounted on the cross bracket, and the inner wall of the mounting cavity is provided with a third through hole, which communicates with the through groove. A rotating rod is rotatably mounted in the third through hole, and the two ends of the rotating rod are fixedly connected to the worm gear and the cross bracket, respectively. When the worm gear rotates, the rotating rod drives the cross bracket to rotate.

[0013] Furthermore, a gear ring is rotatably mounted inside the mounting cavity, and a gear is fixedly mounted at one end of each of the plurality of rotating shafts. The plurality of gears mesh with the gear ring, and when the gear ring rotates, the gear ring drives the plurality of gears to rotate.

[0014] Furthermore, each of the multiple blade bodies has a mounting hole, and each of the multiple mounting holes has an internal hexagon bolt rotatably installed in it. Each of the multiple connecting blocks has a threaded groove, and the internal hexagon bolts cooperate with the threaded grooves.

[0015] Furthermore, the adjusting mechanism includes a worm gear, and a first through hole is provided on the top inner wall of the through groove. The worm gear is rotatably installed in the first through hole. A handwheel is fixedly connected to one end of the worm gear, and a worm wheel is engaged on the worm gear. When the handwheel is turned, the worm gear drives the worm wheel to rotate.

[0016] In summary, this application includes at least one of the following beneficial technical effects:

[0017] 1. This solution uses an internal hex bolt and a threaded groove to secure the blade body to the mounting base when the internal hex bolt is tightened. This prevents the blade body from loosening due to vibration or other reasons during operation. At the same time, it enables the blade body to connect with the mounting base, allowing the blade body to be quickly positioned and installed in the designated location, facilitating disassembly and maintenance.

[0018] 2. In this solution, rotating the handwheel causes the worm to rotate within the first through hole on the inner wall of the top of the slot. Since the worm meshes with the worm wheel, the worm drives the worm wheel to rotate, which in turn drives the rotating rod to rotate. The rotating rod then drives the cross bracket to rotate, which in turn drives the gear ring to rotate. The gear ring then drives multiple gears to rotate, which in turn drives multiple rotating shafts to rotate. These rotating shafts then drive multiple connecting blocks to rotate. The multiple connecting blocks, in conjunction with the slots, can rotate the blade body, thereby achieving the purpose of adjusting the blade body angle.

[0019] This invention allows for convenient adjustment and quick assembly / disassembly of the blade angle, and can precisely control the fineness of coal powder and ventilation volume according to different coal types and operating conditions, thereby improving the operating efficiency and adaptability of the coal mill. It is also easy to maintain, has a simple structure, and is convenient to use. Attached Figure Description

[0020] Figure 1 This is a front view structural schematic diagram of a blade for a boiler coal mill proposed in this utility model;

[0021] Figure 2 This is a schematic diagram of the structure of the impeller and protective cover for the blades of a boiler coal mill proposed in this utility model;

[0022] Figure 3 This is a schematic diagram of the structure of the blade body and the mounting base of a blade for a boiler coal mill according to the present invention.

[0023] Figure 4 This is a schematic diagram of the internal structure of an impeller for a boiler coal mill blade, as proposed in this utility model.

[0024] Figure 5 This is a schematic diagram of the structure of an adjustment mechanism for the blades of a boiler coal mill proposed in this utility model;

[0025] Figure 6 This is a schematic diagram of the gear ring and gear meshing structure of a blade for a boiler coal mill, as proposed in this utility model.

[0026] Reference numerals in the attached drawings: 1. Impeller; 2. Protective cover; 3. Mounting base; 4. Blade body; 5. Annular threaded groove; 6. Fixed base; 7. Through groove; 8. Connecting block; 9. Socket head bolt; 10. Rotating shaft; 11. Mounting cavity; 12. Gear ring; 13. Cross bracket; 14. Rotating rod; 15. Worm gear; 16. Worm; 17. Handwheel; 18. Gear. Detailed Implementation

[0027] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.

[0028] Example 1

[0029] Reference Figures 1-6 A blade for a boiler coal mill includes: an impeller 1, multiple mounting seats 3 and multiple blade bodies 4, wherein the multiple mounting seats 3 are all fixedly installed on the outer side of the impeller 1, and the multiple blade bodies 4 are respectively installed on the multiple mounting seats 3.

[0030] The protective cover 2 has an annular threaded groove 5 on the impeller 1, and the outer side of the protective cover 2 is provided with threads, which are threadedly connected to the annular threaded groove 5.

[0031] The mounting cavity 11 is located inside the impeller 1. A fixing seat 6 is fixedly installed on the outer side of the impeller 1. A through groove 7 is provided on the fixing seat 6. An adjustment mechanism is provided on the fixing seat 6 to adjust the angle of the blade body 4.

[0032] In this embodiment, a connecting block 8 is fixedly installed on the top of each of the multiple mounting bases 3, and a slot is opened at the bottom of each of the multiple blade bodies 4. The slot is engaged with the connecting block 8. A multiple second through hole is opened on the inner wall of the mounting cavity 11. A rotating shaft 10 is rotatably installed in each of the multiple second through holes. The multiple rotating shafts 10 are rotatably connected to the multiple mounting bases 3 respectively. One end of the multiple rotating shafts 10 is fixedly connected to the outer side of the multiple connecting blocks 8 respectively. A cross bracket 13 is fixedly installed on the gear ring 12. A third through hole is opened on the inner wall of the mounting cavity 11. The third through hole communicates with the through groove 7. A rotating rod 14 is rotatably installed in the third through hole. The two ends of the rotating rod 14 are fixedly connected to the worm gear 15 and the cross bracket 13 respectively. When the worm gear 15 rotates, the rotating rod 14 drives the cross bracket 13 to rotate.

[0033] In this embodiment, a gear ring 12 is rotatably mounted in the mounting cavity 11. One end of each of the multiple rotating shafts 10 is fixedly mounted with a gear 18, and the multiple gears 18 mesh with the gear ring 12. When the gear ring 12 rotates, the gear ring 12 drives the multiple gears 18 to rotate. Each of the multiple blade bodies 4 has a mounting hole, and each of the multiple mounting holes has a hexagon socket head cap screw 9 rotatably mounted in it. Each of the multiple connecting blocks 8 has a threaded groove, and the hexagon socket head cap screw 9 cooperates with the threaded groove. The adjusting mechanism includes a worm gear 16. A first through hole is opened on the top inner wall of the through groove 7, and the worm gear 16 is rotatably mounted in the first through hole. One end of the worm gear 16 is fixedly connected to a handwheel 17, and a worm wheel 15 meshes with the worm gear 16. When the handwheel 17 is rotated, the worm gear 16 drives the worm wheel 15 to rotate.

[0034] The implementation principle of a blade for a boiler coal mill according to an embodiment of this application is as follows: During use, the internal hexagonal bolt 9 engages with the threaded groove. When the internal hexagonal bolt 9 is tightened, the blade body 4 can be firmly fixed to the mounting base 3, preventing the blade body 4 from loosening due to vibration or other reasons during operation. Simultaneously, it achieves docking between the blade body 4 and the mounting base 3, allowing the blade body 4 to be quickly positioned and installed in the designated location, facilitating disassembly and maintenance. During use, rotating the handwheel 17 causes the worm gear 16 to rotate within the first through hole on the inner wall of the top of the through groove 7. Since the worm gear 16 meshes with the worm wheel 15, the worm gear 16 drives the worm wheel 15 to rotate, which in turn drives the rotating rod 14 to rotate. The rotating rod 14 drives the cross bracket 13 to rotate, which in turn drives the gear ring 12 to rotate. The gear ring 12 then drives multiple gears 18 to rotate, and the multiple gears 18 respectively... Multiple rotating shafts 10 drive multiple connecting blocks 8 to rotate. The connecting blocks 8, in conjunction with the slots, drive the blade body 4 to rotate, thereby adjusting the angle of the blade body 4. Adjusting the angle of the blade body 4 changes the flow state and speed of the airflow in the coal mill, thus affecting the force on the coal particles during grinding and separation, and controlling the fineness of the coal powder. For example, when the angle of the blade body 4 increases, the airflow speed decreases relatively, the residence time of the coal powder in the coal mill increases, the grinding effect is stronger, and the coal powder becomes finer; conversely, when the angle of the blade body 4 decreases, the airflow speed increases, the residence time of the coal powder decreases, and the fineness is relatively coarser. By adjusting the angle of the blade body 4, the fineness of the coal powder can be precisely controlled, which can better meet the requirements of different processes such as boiler combustion for the fineness of coal powder, improve combustion efficiency, and reduce incomplete combustion losses.

[0035] Example 2

[0036] The difference between this embodiment and Embodiment 1 is that: multiple blade bodies 4 are provided with mesh reinforcing ribs. By setting the mesh reinforcing ribs, the structural strength of the blade body 4 can be enhanced, enabling it to withstand the centrifugal force generated by high-speed rotation and the impact force of coal powder particles, thus ensuring the stability and reliability of the blade body 4 during long-term operation.

[0037] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.

Claims

1. A blade for a boiler coal mill, characterized in that: include: Impeller (1), multiple mounting seats (3) and multiple blade bodies (4), the multiple mounting seats (3) are fixedly installed on the outside of the impeller (1), and the multiple blade bodies (4) are respectively installed on the multiple mounting seats (3); The protective cover (2) has an annular threaded groove (5) on the impeller (1) and a thread on the outer side of the protective cover (2), which is threaded to the annular threaded groove (5). The mounting cavity (11) is located inside the impeller (1). A fixing seat (6) is fixedly installed on the outside of the impeller (1). A through groove (7) is provided on the fixing seat (6). An adjustment mechanism is provided on the fixing seat (6) to adjust the angle of the blade body (4).

2. The blade for a boiler coal mill according to claim 1, characterized in that: The adjusting mechanism includes a worm (16), and a first through hole is provided on the top inner wall of the through groove (7). The worm (16) is rotatably installed in the first through hole. A handwheel (17) is fixedly connected to one end of the worm (16), and a worm wheel (15) is engaged on the worm (16).

3. The blade for a boiler coal mill according to claim 2, characterized in that: A connecting block (8) is fixedly installed on the top of each of the multiple mounting bases (3), and a slot is opened on the bottom of each of the multiple blade bodies (4), and the slot is engaged with the connecting block (8).

4. The blade for a boiler coal mill according to claim 3, characterized in that: Each of the multiple blade bodies (4) has a mounting hole, and each of the multiple mounting holes has an internal hexagon bolt (9) rotatably installed in it. Each of the multiple connecting blocks (8) has a threaded groove, and the internal hexagon bolt (9) cooperates with the threaded groove.

5. A blade for a boiler coal mill according to claim 4, characterized in that: The inner wall of the mounting cavity (11) is provided with a plurality of second through holes, and a rotating shaft (10) is rotatably installed in each of the plurality of second through holes. The plurality of rotating shafts (10) are rotatably connected to a plurality of mounting seats (3) respectively, and one end of the plurality of rotating shafts (10) is fixedly connected to the outer side of a plurality of connecting blocks (8).

6. A blade for a boiler coal mill according to claim 5, characterized in that: A gear ring (12) is rotatably mounted in the mounting cavity (11), and a gear (18) is fixedly mounted on one end of each of the plurality of rotating shafts (10), and the plurality of gears (18) mesh with the gear ring (12).

7. A blade for a boiler coal mill according to claim 6, characterized in that: The gear ring (12) is fixedly installed on the cross bracket (13). The inner wall of the mounting cavity (11) is provided with a third through hole, which communicates with the through groove (7). A rotating rod (14) is rotatably installed in the third through hole. The two ends of the rotating rod (14) are fixedly connected to the worm gear (15) and the cross bracket (13) respectively.

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