A medium-speed mill direct-blowing pulverizing system for coal-fired power plants

Abstract

The present invention belongs to the field of coal-fired power generation technology, and in particular to a medium-speed mill direct-blowing pulverizing system for coal-fired power plants. In view of the problem that the existing medium-speed coal mill pulverizing system is generally manually loaded during use, which is slow, time-consuming, and labor-intensive, and has low grinding efficiency, the following scheme is proposed, which includes a box body, an operating table fixedly installed on the top of the box body, an annular guard plate fixedly installed on the top of the operating table, a movable roller slidably connected to the operating table, an air guide groove provided on the top of the movable roller, an air guide mechanism provided in the air guide groove, a fixed plate fixedly installed on the inner side of the annular guard plate, a second motor fixedly installed on the top of the fixed plate, a sleeve rotatably connected to the fixed plate, and a transmission connection between the sleeve and the movable roller. The present invention is simple to operate, easy to use, and can facilitate automatic loading of coal mines. At the same time, it can also crush the coal during loading, and blow the pulverized coal out after crushing.

Description

Technical Field

[0001] The invention belongs to the technical field of coal-fired power generation, and in particular relates to a medium-speed mill direct-blowing pulverizing system for a coal-fired power plant. Background Art

[0002] The most significant difference between various coal pulverizing systems in power plant boilers lies in the type of pulverizer. Currently, the three most widely used coal pulverizers are ball mills, medium-speed mills, and fan mills. Medium-speed mills are widely used in units burning bituminous coal and lean coal due to their low power consumption, minimal maintenance, and excellent variable load performance. Some units burning low-moisture lignite also use medium-speed mills for pulverizing coal.

[0003] The existing medium-speed coal mill pulverizing system is generally loaded manually when in use, which is slow, time-consuming and labor-intensive, and has low grinding efficiency. Summary of the Invention

[0004] The purpose of the present invention is to solve the shortcomings of the existing medium-speed coal mill pulverizing system, which is generally loaded manually during use, which is slow, time-consuming and labor-intensive, and has low grinding efficiency. A medium-speed mill direct-blowing pulverizing system for coal-fired power plants is proposed.

[0005] In order to achieve the above object, the present invention adopts the following technical solutions:

[0006] A medium-speed mill direct-blowing pulverizing system for a coal-fired power plant comprises a box body, an operating table is fixedly installed on the top of the box body, an annular guard plate is fixedly installed on the top of the operating table, a movable roller is slidably connected to the operating table, an air guide groove is provided on the top of the movable roller, an air guide mechanism is provided in the air guide groove, a fixed plate is fixedly installed on the inner side of the annular guard plate, a second motor is fixedly installed on the top of the fixed plate, a sleeve is rotatably connected to the fixed plate, the sleeve is transmission-connected to the movable roller, the output shaft of the second motor is transmission-connected to the sleeve, and the movable plate is slidably connected to the inner wall of the annular guard plate and the positioning plate, the movable plate is transmission connected to the sleeve, a third motor is fixedly installed on the top of the movable plate, two symmetrically arranged connecting rods are rotatably connected between the movable plate and the positioning plate, the output shaft of the third motor is transmission connected to the corresponding connecting rod, a grinding mechanism is provided at the bottom of the positioning plate, the grinding mechanism is transmission connected to the corresponding connecting rod, discharge holes are provided on both sides of the annular guard plate, an isolation net is fixedly installed on the inner wall of the discharge hole, air guide holes are provided on both sides of the air guide groove, a material guiding mechanism is provided on the movable roller, the material guiding mechanism cooperates with the box body, and a door panel is rotatably connected to one side of the box body.

[0007] Preferably, the air guide mechanism includes a fixing rod, which is fixedly mounted on the inner wall of the air guide groove, a first motor is fixedly mounted on the fixing rod, a fan blade is fixedly mounted on the output shaft of the first motor, and the fan blade cooperates with the two air guide holes.

[0008] Preferably, the grinding mechanism includes two grinding rollers, the bottom of the positioning plate is rotatably connected to the bottom plate, the two grinding rollers are rotatably installed on the bottom of the bottom plate, and the two grinding rollers cooperate with the operating table.

[0009] Preferably, the feeding mechanism includes two feeding troughs, which are opened on both sides of the movable roller, and a discharge hole is opened at the bottom of the feeding trough. A retaining ring is slidably connected to the outer side of the movable roller, and the retaining ring cooperates with the two discharge holes.

[0010] Preferably, an annular groove is provided on the top of the base plate, an inner gear ring is fixedly mounted on the inner wall of the annular groove, a driven gear is fixedly mounted on the bottom end of one of the two connecting rods, and the driven gear and the inner gear ring are meshed with each other.

[0011] Preferably, blocks are fixedly installed on both sides of the retaining ring, fixed blocks are fixedly installed on both sides of the movable roller, a buffer rod is slidably connected to the fixed block, the buffer rod is fixedly connected to the corresponding block, and the same reset spring is fixedly installed between the block and the fixed block.

[0012] Preferably, a driving gear is fixedly mounted on the output shaft of the second motor, an outer gear ring is fixedly mounted on the outer side of the sleeve, and the driving gear and the outer gear ring are meshed with each other.

[0013] Preferably, positioning blocks are fixedly mounted on the inner sides of the movable plate and the sleeve, and circulation grooves are provided on the outer sides of the sleeve and the movable roller, and the circulation grooves are slidably connected to the corresponding positioning blocks.

[0014] Preferably, an annular chute is provided at the bottom of the positioning plate, and two symmetrically arranged connecting blocks are slidably connected to the inner wall of the annular chute, and the two connecting blocks are fixedly connected to the bottom plate.

[0015] Preferably, positioning grooves are provided on both sides of the inner walls of the annular sliding groove, and two symmetrically arranged sliding blocks are slidably connected to the inner walls of the positioning groove, and the two sliding blocks are fixedly connected to the corresponding connecting blocks.

[0016] Compared with the prior art, the present invention has at least the following beneficial technical effects:

[0017] (1) In this solution, due to the arrangement of the first motor and the fan blades, and the cooperation between the air guide holes and the fan blades, the output shaft of the first motor can blow the crushed coal on the operating table through the air guide holes;

[0018] (2) Due to the sliding connection between the circulation groove and the positioning block, the mutual meshing of the driven gear and the inner gear ring, and the mutual cooperation between the roller and the operating table, the rotating connecting rod can drive the roller to rotate, thereby crushing the coal on the operating table;

[0019] (3) Due to the sliding connection between the circulation trough and the positioning block, and the mutual cooperation between the feeding trough and the discharge hole, the coal in the box is automatically fed under the action of the retaining ring, which makes it easy to crush on the operating table.

[0020] The invention is simple to operate and easy to use, can automatically feed the coal mine, can also crush the coal during feeding, and can blow air to make powder for export after crushing. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 This is a schematic structural diagram of a medium-speed mill direct-blowing pulverizing system for coal-fired power plants proposed by the present invention;

[0022] Figure 2 This is a schematic cross-sectional structure diagram of a bottom plate of a medium-speed mill direct-blowing pulverizing system for a coal-fired power plant proposed by the present invention;

[0023] Figure 3 This is a schematic diagram of the casing cross-sectional structure of the bottom plate of a medium-speed mill direct-blowing pulverizing system for a coal-fired power plant proposed by the present invention;

[0024] Figure 4 This is a schematic structural diagram of part A of a medium-speed mill direct-blowing pulverizing system for coal-fired power plants proposed by the present invention;

[0025] Figure 5 This is a structural schematic diagram of part B of a medium-speed mill direct-blowing pulverizing system for a coal-fired power plant proposed by the present invention.

[0026] Description of reference numerals:

[0027] 1. Box body; 2. Operating table; 3. Annular guard plate; 4. Fixed plate; 5. Moving roller; 6. Air guide trough; 7. Fixed rod; 8. First motor; 9. Fan blade; 10. Casing; 11. Second motor; 12. Driving gear; 13. Outer gear ring; 14. Moving plate; 15. Positioning block; 16. Circulation trough; 17. Positioning plate; 18. Connecting rod; 19. Third motor; 20. Bottom plate; 21. Roller; 22. Discharge hole; 23. Isolation net; 24. Air guide hole; 25. Annular groove; 26. Driven gear; 27. Inner gear ring; 28. Loading chute; 29. Discharge hole; 30. Retaining ring; 31. Block; 32. Fixed block; 33. Buffer rod; 34. Reset spring. DETAILED DESCRIPTION

[0028] The technical solution of this embodiment will be clearly and completely described below in conjunction with the drawings in this embodiment. Obviously, the described embodiment is only a part of this embodiment, rather than all the embodiments.

[0029] Example 1

[0030] Reference Figure 1-5 A medium-speed mill direct-blowing pulverizing system for a coal-fired power plant includes a box body 1, an operating table 2 is fixedly installed on the top of the box body 1, an annular guard plate 3 is fixedly installed on the top of the operating table 2, a moving roller 5 is slidably connected to the operating table 2, an air guide groove 6 is opened on the top of the moving roller 5, an air guide mechanism is provided in the air guide groove 6, a fixed plate 4 is fixedly installed on the inner side of the annular guard plate 3, a second motor 11 is fixedly installed on the top of the fixed plate 4, a sleeve 10 is rotatably connected to the fixed plate 4, the sleeve 10 is transmission-connected to the moving roller 5, the output shaft of the second motor 11 is transmission-connected to the sleeve 10, a moving plate 14 and a positioning plate 17 are slidably connected to the inner wall of the annular guard plate 3, and the moving roller 5 is provided with an air guide groove 6. The plate 14 is transmission connected to the sleeve 10, and a third motor 19 is fixedly installed on the top of the movable plate 14. Two symmetrically arranged connecting rods 18 are rotatably connected between the movable plate 14 and the positioning plate 17. The output shaft of the third motor 19 is transmission connected to the corresponding connecting rod 18. A grinding mechanism is provided at the bottom of the positioning plate 17, and the grinding mechanism is transmission connected to the corresponding connecting rod 18. Discharge holes 22 are provided on both sides of the annular guard plate 3, and an isolation net 23 is fixedly installed on the inner wall of the discharge hole 22. Air guide holes 24 are provided on both sides of the air guide groove 6. A material guiding mechanism is provided on the movable roller 5, and the material guiding mechanism cooperates with the box body 1. A door panel is rotatably connected to one side of the box body 1.

[0031] In this embodiment, the air guide mechanism includes a fixed rod 7, which is fixedly mounted on the inner wall of the air guide groove 6. A first motor 8 is fixedly mounted on the fixed rod 7, and a fan blade 9 is fixedly mounted on the output shaft of the first motor 8. The fan blade 9 cooperates with the two air guide holes 24. The output shaft of the first motor 8 forms air flow through the fan blade 9, thereby blowing the coal powder on the operating table 2.

[0032] In this embodiment, the grinding mechanism includes two grinding rollers 21. The bottom of the positioning plate 17 is rotatably connected to the bottom of the bottom plate 20. The two grinding rollers 21 are rotatably installed at the bottom of the bottom plate 20. The two grinding rollers 21 cooperate with the operating table 2. An annular groove 25 is provided on the top of the bottom plate 20. An internal gear ring 27 is fixedly installed on the inner wall of the annular groove 25. A driven gear 26 is fixedly installed on the bottom end of one of the two connecting rods 18. The driven gear 26 and the internal gear ring 27 are meshed with each other. An annular slide is provided at the bottom of the positioning plate 17. Two symmetrically arranged connecting blocks are slidably connected on the inner wall of the annular slide. The two connecting blocks are fixedly connected to the bottom plate 20. Positioning grooves are provided on the inner walls of both sides of the annular slide. Two symmetrically arranged sliders are slidably connected on the inner wall of the positioning groove. The two sliders are fixedly connected to the corresponding connecting blocks. The rotating connecting rod 18 drives the bottom plate 20 to rotate through the mutual meshing of the driven gear 26 and the internal gear ring 27, thereby driving the grinding rollers 21 to grind the coal powder on the operating table 2.

[0033] In this embodiment, the feeding mechanism includes two feeding troughs 28, which are opened on both sides of the moving roller 5. A discharge hole 29 is opened at the bottom of the feeding trough 28. A retaining ring 30 is slidably connected to the outer side of the moving roller 5. The retaining ring 30 cooperates with the two discharge holes 29. Blocks 31 are fixedly installed on both sides of the retaining ring 30. Fixed blocks 32 are fixedly installed on both sides of the moving roller 5. A buffer rod 33 is slidably connected to the fixed block 32. The buffer rod 33 is fixedly connected to the corresponding block 31. The same return spring 34 is fixedly installed between the block 31 and the fixed block 32. The moving moving roller 5 feeds the coal in the box body 1 through the feeding trough 28 and discharges it through the discharge hole 29.

[0034] In this embodiment, a driving gear 12 is fixedly mounted on the output shaft of the second motor 11, an outer gear ring 13 is fixedly mounted on the outer side of the sleeve 10, the driving gear 12 and the outer gear ring 13 are meshed with each other, and positioning blocks 15 are fixedly mounted on the movable plate 14 and the inner side of the sleeve 10. Circulation grooves 16 are provided on the outer side of the sleeve 10 and the outer side of the movable roller 5, and the circulation grooves 16 are slidably connected with the corresponding positioning blocks 15. The output shaft of the second motor 11 drives the sleeve 10 to rotate through the mutual meshing of the driving gear 12 and the outer gear ring 13, and then drives the movable roller 5 and the movable plate 14 to move up and down through the sliding connection between the circulation groove 16 and the positioning block 15.

[0035] Working principle: during operation, the coal is introduced into the two feeding chutes 28 through the accumulation in the box body 1, and the switch of the second motor 11 is started. The output shaft of the second motor 11 drives the sleeve 10 to rotate through the mutual engagement of the active gear 12 and the outer gear ring 13. The sleeve 10 drives the moving roller 5 and the moving plate 14 to move up and down through the sliding connection of the circulation groove 16 and the positioning block 15, and the moving directions of the moving roller 5 and the moving plate 14 are opposite. When the moving roller 5 moves upward, the moving roller 5 drives the material in the feeding chute 28 to move above the operating table 2. When the moving roller 5 drives the stop block 31 to move to the top inner wall position of the box body 1, the stop ring 30 is pushed downward under the action of the top inner wall of the box body 1, thereby opening the discharge hole 29, and then guiding the coal in the feeding chute 28. Out, at the same time, the movable plate 14 moves downward, and the movable plate 14 drives the positioning plate 17 to move downward through the two connecting rods 18, and the positioning plate 17 drives the grinding roller 21 on the bottom plate 20 to contact the operating platform 2, and at the same time, the third motor 19 switch is started again, and the output shaft of the third motor 19 drives the connecting rod 18 to rotate, and the connecting rod 18 drives the bottom plate 20 to rotate through the mutual engagement of the driven gear 26 and the inner gear ring 27, and the bottom plate 20 drives the grinding roller 21 to grind and crush the coal on the operating platform 2. When the grinding roller 21 moves upward to the operating platform 2, the first motor 8 switch is started, and the output shaft of the first motor 8 drives the fan blade 9 to rotate, and the fan blade 9 forms air flow, so that the coal dust on the operating platform 2 can be blown through the air guide hole 24 and discharged through the discharge hole 22.

[0036] Example 2

[0037] The difference between the second embodiment and the first embodiment is that the bottom of the box body 1 is rotatably connected with four symmetrically arranged universal lockable wheels, and the arrangement of the universal lockable wheels can facilitate the movement and transportation of the device.

[0038] The above is only a preferred specific implementation method of this embodiment, but the protection scope of this embodiment is not limited to this. Any technician familiar with this technical field can make equivalent replacements or changes based on the technical solution and inventive concept of this embodiment within the technical scope disclosed in this embodiment, and they should be covered by the protection scope of this embodiment.

Claims

1. A medium-speed mill direct-blowing pulverizing system for coal-fired power plants, characterized in that: The invention comprises a box body (1), an operating table (2) is fixedly installed on the top of the box body (1), an annular guard plate (3) is fixedly installed on the top of the operating table (2), a moving roller (5) is slidably connected to the operating table (2), an air guide groove (6) is provided on the top of the moving roller (5), an air guide mechanism is provided in the air guide groove (6), a fixed plate (4) is fixedly installed on the inner side of the annular guard plate (3), a second motor (11) is fixedly installed on the top of the fixed plate (4), a sleeve (10) is rotatably connected to the fixed plate (4), the sleeve (10) is transmission-connected to the moving roller (5), an output shaft of the second motor (11) is transmission-connected to the sleeve (10), a moving plate (14) and a positioning plate (17) are slidably connected to the inner wall of the annular guard plate (3), the moving plate (14) is transmission-connected to the sleeve (10), a third motor (19) is fixedly installed on the top of the moving plate (14), two symmetrically arranged connecting rods (18) are rotationally connected between the moving plate (14) and the positioning plate (17), the output shaft of the third motor (19) is transmission-connected to the corresponding connecting rod (18), a grinding mechanism is provided at the bottom of the positioning plate (17), the grinding mechanism is transmission-connected to the corresponding connecting rod (18), both sides of the annular guard plate (3) are provided with discharge holes (22), an isolation net (23) is fixedly installed on the inner wall of the discharge hole (22), both sides of the air guide groove (6) are provided with air guide holes (24), a material guide mechanism is provided on the moving roller (5), the material guide mechanism cooperates with the box body (1), and a door panel is rotationally connected to one side of the box body (1); The feeding mechanism includes two feeding troughs (28), the two feeding troughs (28) are opened on both sides of the moving roller (5), a discharge hole (29) is opened at the bottom of the feeding trough (28), a retaining ring (30) is slidably connected to the outer side of the moving roller (5), and the retaining ring (30) cooperates with the two discharge holes (29); both sides of the retaining ring (30) are fixedly installed with a stopper (31), both sides of the moving roller (5) are fixedly installed with a fixed block (32), a buffer rod (33) is slidably connected to the fixed block (32), the buffer rod (33) is fixedly connected to the corresponding stopper (31), and the same return spring (34) is fixedly installed between the stopper (31) and the fixed block (32); Positioning blocks (15) are fixedly mounted on the inner sides of the movable plate (14) and the sleeve (10), and circulation grooves (16) are provided on the outer sides of the sleeve (10) and the outer sides of the movable roller (5). The circulation grooves (16) are slidably connected to the corresponding positioning blocks (15).

2. A medium-speed mill direct-fired pulverizing system for a coal-fired power plant according to claim 1, characterized in that: The air guide mechanism comprises a fixed rod (7), the fixed rod (7) being fixedly mounted on the inner wall of the air guide groove (6), a first motor (8) being fixedly mounted on the fixed rod (7), a fan blade (9) being fixedly mounted on the output shaft of the first motor (8), and the fan blade (9) being coordinated with the two air guide holes (24).

3. The medium-speed mill direct-fired pulverizing system for a coal-fired power plant according to claim 1, characterized in that: The grinding mechanism comprises two grinding rollers (21), the bottom of the positioning plate (17) is rotatably connected to the bottom plate (20), the two grinding rollers (21) are rotatably mounted on the bottom of the bottom plate (20), and the two grinding rollers (21) cooperate with the operating table (2).

4. A medium-speed mill direct-fired pulverizing system for a coal-fired power plant according to claim 3, characterized in that: An annular groove (25) is formed on the top of the bottom plate (20), an inner gear ring (27) is fixedly mounted on the inner wall of the annular groove (25), and a driven gear (26) is fixedly mounted on the bottom end of one of the two connecting rods (18), and the driven gear (26) and the inner gear ring (27) are meshed with each other.

5. The medium-speed mill direct-fired pulverizing system for coal-fired power plants according to claim 1, characterized in that: A driving gear (12) is fixedly mounted on the output shaft of the second motor (11), an outer gear ring (13) is fixedly mounted on the outer side of the sleeve (10), and the driving gear (12) and the outer gear ring (13) are meshed with each other.

6. The medium-speed mill direct-fired pulverizing system for coal-fired power plants according to claim 1, characterized in that: An annular chute is provided at the bottom of the positioning plate (17), and two symmetrically arranged connecting blocks are slidably connected to the inner wall of the annular chute, and the two connecting blocks are fixedly connected to the bottom plate (20).

7. A medium-speed mill direct-fired pulverizing system for a coal-fired power plant according to claim 6, characterized in that: Positioning grooves are provided on both inner walls of the annular sliding groove. Two symmetrically arranged sliding blocks are slidably connected to the inner walls of the positioning grooves. The two sliding blocks are fixedly connected to corresponding connecting blocks.

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