Coal crushing and screening device for thermal power plant

Abstract

The invention relates to the field of thermal power generation, and particularly discloses a coal crushing and screening device for a thermal power plant, which comprises a crushing box, an arc-shaped screen plate arranged at the upper end of the inner side of the crushing box, a main shaft rotationally arranged at the upper end of the screen plate and a crushing ring hammer fixedly arranged on the main shaft, an anti-blocking mechanism used for preventing the blanking groove from being blocked is arranged on the sieve plate, the anti-blocking mechanism comprises a sliding strip connected to the bottom wall of the sieve plate in a sliding mode, and an anti-blocking block matched with the blanking groove in a sliding mode is arranged at the top of the sliding strip; and a linkage mechanism which is used for driving the sliding strips to slide along the bottom wall of the sieve plate and is linked with the rotation of the main shaft is arranged on the outer side of the crushing box. According to the coal crushing and screening device for the thermal power plant, through the arrangement of the anti-blocking mechanism and the main shaft, the discharging groove in the screening plate can be cleaned during crushing and screening, blocking is avoided, and coal particles clamped in the discharging groove can be pushed out in cooperation with reinforcing ribs in the discharging groove.

Description

Technical Field

[0001] The invention relates to the field of thermal power generation, and in particular to a coal crushing and screening device for a thermal power plant. Background Art

[0002] Hammer coal crusher is an impact rotor crusher with a crushing ring, which is widely used in places where coal needs to be finely crushed, such as thermal power plants. Its working principle is to use the high-speed rotating rotor hammer to exert impact force, splitting shear force, extrusion force, etc. on the coal, so that the coal generates interaction force between the hammer and the coal crushing plate, the screen plate, and between the coal, so as to be crushed into particles of the required size.

[0003] Hammer coal crusher plays an important role in the fine crushing of coal, but the problem of screen plate clogging has always been a difficult problem. Softer coal is easy to adhere to or fill in the screen plate during the crushing process. In addition, coal particles are stuck in the screen plate holes due to irregular shape or excessive size, and improper operation leads to uneven or excessive feeding, which can cause screen plate clogging. This not only seriously affects the screening efficiency, but also forces the crushing device to stop for cleaning, which is time-consuming and labor-intensive and affects the overall production efficiency.

[0004] In addition, although the arc-shaped screen plate design of the hammer coal crusher helps to roll and screen the coal particles, it also leads to the problem of material concentration. The material tends to gather at the lowest point of the arc on the screen plate, resulting in low space utilization of the material receiving device and may even cause material accumulation and blockage, further affecting the normal operation of the crushing device. At the same time, material concentration also aggravates the uneven force of the material receiving device and increases its risk of wear and failure.

[0005] Therefore, it is necessary to propose a coal crushing and screening device for thermal power plants to solve the above problems. Summary of the invention

[0006] The main purpose of the present invention is to provide a coal crushing and screening device for a thermal power plant, which can effectively solve the problems in the background technology.

[0007] To achieve the above object, the technical solution adopted by the present invention is:

[0008] A coal crushing and screening device for a thermal power plant, comprising a crushing box, an arc-shaped sieve plate arranged at the upper end of the inner side of the crushing box, a main shaft rotatably arranged at the upper end of the sieve plate, and a crushing ring hammer fixedly arranged on the main shaft, wherein the sieve plate is provided with an arc-shaped material dropping chute, and the sieve plate is provided with an anti-blocking mechanism for preventing the material dropping chute from being blocked, wherein the anti-blocking mechanism comprises a slide bar slidably connected to the bottom wall of the sieve plate, an anti-blocking block slidably matched with the material dropping chute is provided on the top of the slide bar, and both sides of the upper end of the anti-blocking block are inclined surfaces, and cylindrical reinforcing ribs are evenly arranged on the inner side of the material dropping chute, and the anti-blocking block is located between adjacent reinforcing ribs in each material dropping chute;

[0009] The outer side of the crushing box is provided with a linkage mechanism for driving the slide bar to slide along the bottom wall of the screen plate and to be linked with the rotation of the main shaft, and the linkage mechanism includes an incomplete gear arranged at both ends of the main shaft, the outer side of the crushing box is slidably connected with a traction plate frame corresponding to the incomplete gear, the traction plate frame is located at the outer side of the incomplete gear, and the two ends of the traction plate frame are arc-shaped, and the upper and lower ends of the inner side of the traction plate frame are provided with gear teeth for intermittently meshing with the incomplete gear, and a first connecting plate is arranged at the bottom of the traction plate frame, and a driving groove is arranged on the first connecting plate. The side wall of the crushing box is provided with a straight sliding groove, and a blocking slide plate corresponding to the first connecting plate is slidably connected to the inner side of the straight sliding groove, and a driving shaft extending to the inner side of the driving groove is arranged on one side of the blocking slide plate, and the other side is connected with the end of the slide bar, and an adjusting plate is arranged on the side of the blocking slide plate close to the slide bar, and an adjusting long groove is arranged on the side of the adjusting plate facing the slide bar, and a convex shaft for movably cooperating with the adjusting long groove is arranged at the end of the slide bar located in the middle, so that the slide bar moves back and forth along the bottom wall of the screen plate when the main shaft rotates.

[0010] Preferably, the main shaft is driven to rotate by a driving source arranged outside the crushing box, and the driving source includes a reduction motor arranged on one side of the crushing box. The output end of the reduction motor and one end of the main shaft are both provided with synchronous wheels, and synchronous belts are provided on the two synchronous wheels.

[0011] Preferably, there are multiple slide bars, and the slide bars are evenly distributed at the bottom of the sieve plate, and the multiple slide bars are connected as a whole through an arc-shaped second connecting plate.

[0012] Preferably, lifting devices corresponding to the ends of the screen plate and used to drive the screen plate to vertically move are arranged on both sides of the upper end of the inner cavity of the crushing box.

[0013] Preferably, a uniform material distribution mechanism is provided at the lower end of the crushing box, and the uniform material distribution mechanism includes a distribution barrel arranged at the lower end of the inner cavity of the crushing box, and inclined guide plate assemblies are provided at both ends of the top of the distribution barrel, and the guide plate assembly includes a first guide plate movably connected to both sides of the lower end of the inner cavity of the crushing box and is hollow, a second guide plate is movably connected to the inner side of the lower end of the first guide plate, and the lower end of the second guide plate is movably connected to the top edge of the distribution barrel, an "L"-shaped connecting arm is fixedly provided at the lower end of the first connecting plate, and a second through groove corresponding to the connecting arm is provided on the lower end side wall of the crushing box, and one end of the connecting arm extends through the second through groove to the inner side of the crushing box and is fixedly connected to the side wall of the distribution barrel.

[0014] Preferably, the uniform material distribution mechanism is provided with a dust suppression mechanism, and the dust suppression mechanism includes fan covers arranged at both ends of the inner side of the material distribution barrel, and the ends of the material distribution barrel are rotatably provided with a fan shaft corresponding to the fan cover, one end of the fan shaft extends to the inner side of the fan cover and is provided with fan blades, and the side wall of the lower end of the inner cavity of the crushing box is provided with a mounting groove corresponding to the material distribution barrel, and the end of the fan shaft away from the fan blades extends to the inner side of the mounting groove and is provided with a gear assembly, and the inner wall of the mounting groove is provided with a rack assembly meshing with the gear assembly, and the gear assembly and the rack assembly are configured When the distributing barrel moves back and forth, the fan shaft always rotates in one direction, and dust hoods for dust collection are provided at both ends of the bottom of the distributing barrel, and a dust-proof net is provided at the bottom of the dust hood. The end of the fan hood away from the gear is an air inlet, and the air inlet is connected to the dust hood through a pipe. When the fan blades rotate, dust can be sucked through the dust hood. The end side wall of the distributing barrel is provided with a third through groove corresponding to the mounting groove, and the side wall of the crushing box is provided with a first through groove connected to the mounting groove, and the third through groove and the first through groove are used for discharging gas in the fan hood to the outside.

[0015] Preferably, the rack assembly includes a pair of racks arranged at the upper and lower ends of the inner cavity of the installation slot, and the two racks in the same installation slot are arranged opposite to each other, and the two racks are located in different vertical planes;

[0016] The gear assembly includes a pair of one-way bearings fixedly arranged at one end of the fan shaft away from the fan blades, and the outer wall of the one-way bearing is fixedly provided with a gear corresponding to the rack one by one, and the two one-way bearings at the same end can rotate in opposite directions.

[0017] Preferably, a scraper corresponding to the dustproof net is provided at the lower end of the inner cavity of the crushing box, and the dustproof net can pass through and be scraped by the scraper when it is displaced.

[0018] Preferably, the end side wall of the material distribution barrel is provided with a blocking plate for shielding the mounting groove, and the blocking plate is always in a shielding state for the mounting groove when the material distribution barrel moves back and forth.

[0019] Preferably, a receiving hopper corresponding to the material distribution cylinder and used for receiving materials is provided at the lower end of the crushing box.

[0020] Compared with the prior art, the present invention provides a coal crushing and screening device for a thermal power plant, which has the following beneficial effects:

[0021] 1. The coal crushing and screening device for thermal power plants is linked with the main shaft through the anti-blocking mechanism, so that the chute on the screen plate can be cleaned during crushing and screening to avoid blockage. It has a compact structure and is easy to use. The anti-blocking block has inclined surfaces on both sides, which cooperate with the reinforcing ribs in the chute to push out the coal particles stuck in the chute, reduce blockage, and improve the feeding efficiency. The adjustment adapter is set to facilitate the linkage mechanism to adapt to the adjustment of the screen plate, and the linkage mechanism will not be affected when the gap between the screen plate and the crushing hammer is changed.

[0022] 2. The coal crushing and screening device used in the thermal power plant can evenly disperse the falling materials during crushing and screening through the linkage setting of the uniform material distribution mechanism and the linkage mechanism, ensure the uniformity of the falling materials during material receiving, and improve the space utilization rate of the material receiving device. The setting of the dust suppression mechanism can absorb and filter the dust raised by the falling materials during the material distribution by the uniform material distribution mechanism, which can greatly reduce the raising of dust, reduce environmental pollution and the impact on the physical and mental health of workers. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a schematic diagram of the structure of the present invention;

[0024] Figure 2 It is a structural schematic diagram of another perspective of the present invention;

[0025] Figure 3 It is a partial cross-sectional structural schematic diagram of the crushing box of the present invention;

[0026] Figure 4 The present invention Figure 3 Schematic diagram of the structure after the crushing box is removed from the foundation;

[0027] Figure 5 It is a schematic diagram of the structure of the present invention when the crushing ring hammer and the screen plate are separated;

[0028] Figure 6 It is a schematic diagram of the structure of the slide bar and the screen plate of the present invention when they are separated;

[0029] Figure 7 It is a schematic diagram of the structure of the present invention when the drive shaft and the first connecting plate are separated;

[0030] Figure 8 The present invention Figure 3 Schematic diagram of the structure of the crushing box on the foundation;

[0031] Fig. 9 It is a schematic structural diagram of the dust suppression mechanism and the uniform material distribution mechanism of the present invention;

[0032] Fig.10 The present invention Fig. 9A structural diagram from another perspective based on the above;

[0033] Fig.11 It is a schematic diagram of the structure of the material distribution barrel and the dust suppression mechanism of the present invention in a separated state;

[0034] Fig.12 It is a schematic diagram of the structure of the fan shaft and gear of the present invention when they are separated.

[0035] In the figure: 1. Crushing box; 2. Receiving hopper; 3. Speed ​​reduction motor; 4. Synchronous belt; 5. Synchronous wheel; 6. First through slot; 7. Crushing hammer; 8. Main shaft; 9. Lifting device; 10. Screen plate; 11. Traction plate frame; 12. First connecting plate; 13. Blocking slide plate; 14. Blocking plate; 15. First guide plate; 16. Second guide plate; 17. Distributing barrel; 18. Rack; 19. One-way bearing; 20. Incomplete gear; 21. Slide bar ; 22. blanking chute; 23. reinforcing ribs; 24. second connecting plate; 25. convex shaft; 26. anti-blocking block; 27. adjusting plate; 28. adjusting long slot; 29. ​​driving slot; 30. driving shaft; 31. straight sliding slot; 32. mounting slot; 33. second through slot; 34. gear; 35. scraper; 36. connecting arm; 37. fan cover; 38. dust cover; 39. dust net; 40. third through slot; 41. fan shaft; 42. fan blades. DETAILED DESCRIPTION

[0036] In order to make the technical means, creative features, objectives and effects achieved by the present invention easy to understand, the present invention is further explained below in conjunction with specific implementation methods.

[0037] like Figure 1-Figure 6As shown, a coal crushing and screening device for a thermal power plant comprises a crushing box 1, an arc-shaped screen plate 10 arranged at the upper end of the inner side of the crushing box 1, a main shaft 8 rotatably arranged at the upper end of the screen plate 10, and a crushing ring hammer 7 fixedly arranged on the main shaft 8. A feed port is arranged at the top of the crushing box 1, and a receiving hopper 2 is arranged at the bottom. The main shaft 8 is driven to rotate by a driving source arranged at the outer side of the crushing box 1. The driving source comprises a reduction motor 3 arranged at one side of the crushing box 1. Synchronous wheels 5 are arranged at the output end of the reduction motor 3 and one end of the main shaft 8, and synchronous belts 4 are arranged on the two synchronous wheels 5. An arc-shaped drop chute 22 is arranged on the screen plate 10, and a belt 22 for An anti-blocking mechanism for preventing the blanking chute 22 from being blocked, the anti-blocking mechanism includes a slide bar 21 slidably connected to the bottom wall of the sieve plate 10, the number of the slide bars 21 is multiple, and the slide bars 21 are evenly distributed at the bottom of the sieve plate 10, and the multiple slide bars 21 are connected as a whole through an arc-shaped second connecting plate 24. Specifically, an arc-shaped guide rail is provided at the bottom of the sieve plate 10, and the slide bar 21 is movably connected to the outside of the guide rail. An anti-blocking block 26 that slidably cooperates with the blanking chute 22 is provided on the top of the slide bar 21, and both sides of the upper end of the anti-blocking block 26 are inclined surfaces, and cylindrical reinforcing ribs 23 are evenly provided on the inner side of the blanking chute 22, and the anti-blocking block 26 is located between adjacent reinforcing ribs 23 in each blanking chute 22;

[0038] like Figure 3-Figure 8As shown, in order to realize the displacement of the slide bar 21, a linkage mechanism for driving the slide bar 21 to slide along the bottom wall of the screen plate 10 and to rotate in linkage with the main shaft 8 is arranged on the outside of the crushing box 1, and the linkage mechanism includes an incomplete gear 20 arranged at both ends of the main shaft 8, and the outer side of the crushing box 1 is slidably connected with a traction plate frame 11 corresponding to the incomplete gear 20. Specifically, a linear guide is arranged on the side wall of the crushing box 1, and the traction plate frame 11 is movably connected with the linear guide. The traction plate frame 11 is located on the outside of the incomplete gear 20, and the two ends of the traction plate frame 11 are arc-shaped. The upper and lower ends of the inner side of the traction plate frame 11 are provided with gear teeth for intermittently meshing with the incomplete gear 20, and the incomplete gear 20 can mesh with the gear teeth on the other side after being separated from the gear teeth on one side. A first connecting plate 12 is arranged at the bottom of the traction plate frame 11, and a driving groove 29 is arranged on the first connecting plate 12. The side wall of 1 is provided with a straight slide groove 31, and a blocking slide plate 13 corresponding to the first connecting plate 12 is slidably connected to the inner side of the straight slide groove 31, so that the blocking slide plate 13 is convenient for blocking the straight slide groove 31 to prevent dust and material from leaking out, and the two ends of the blocking slide plate 13 are located on the inner side of the end of the straight slide groove 31, and the blocking slide plate 13 can always completely block the straight slide groove 31 when it is displaced. One side of the blocking slide plate 13 is provided with a driving shaft 30 extending to the inner side of the driving groove 29, and the other side is connected to the end of the slide bar 21, and the side of the blocking slide plate 13 close to the slide bar 21 is provided with an adjustment plate 27, and the side of the adjustment plate 27 facing the slide bar 21 is provided with an adjustment long groove 28, and the end of the slide bar 21 located in the middle is provided with a convex shaft 25 for movably cooperating with the adjustment long groove 28, and the height of the adjustment long groove 28 is greater than the diameter of the convex shaft 25, so that when the main shaft 8 rotates, the slide bar 21 moves back and forth along the bottom wall of the screen plate 10.

[0039] like Figure 3-Figure 4 As shown, in order to adjust the gap between the crushing ring hammer 7 and the screen plate 10, lifting devices 9 corresponding to the ends of the screen plate 10 and used to drive the screen plate 10 to vertically move are arranged on both sides of the upper end of the inner cavity of the crushing box 1. The lifting device 9 is preferably a cylinder or a hydraulic cylinder, or other driving devices that can drive the screen plate 10 to move up and down can also be substituted;

[0040] Further, such as Figure 3-Figure 4 , Figure 8-Figure 11As shown, a uniform material distribution mechanism is provided at the lower end of the crushing box 1, and the uniform material distribution mechanism includes a distribution barrel 17 arranged at the lower end of the inner cavity of the crushing box 1, and the distribution barrel 17 is a rectangular cylinder corresponding to the screen plate 10, and inclined guide plate assemblies are provided at both ends of the top of the distribution barrel 17, and the guide plate assembly includes a first guide plate 15 which is movably connected to both sides of the lower end of the inner cavity of the crushing box 1 and is hollow, and a second guide plate 16 is movably connected to the inner side of the lower end of the first guide plate 15, and the lower end of the second guide plate 16 is movably connected to the top edge of the distribution barrel 17, and an "L"-shaped connecting arm 36 is fixedly provided at the lower end of the first connecting plate 12, and a second through groove 33 corresponding to the connecting arm 36 is provided on the lower end side wall of the crushing box 1, and one end of the connecting arm 36 passes through the second through groove 33 and extends to the inner side of the crushing box 1 and is fixedly connected to the side wall of the distribution barrel 17, and the connecting arm 36 is slidably connected to the second through groove 33.

[0041] In addition, if Figure 4 , Figure 8-Figure 12 As shown, a dust suppression mechanism is provided on the uniform material distribution mechanism, and the dust suppression mechanism includes fan covers 37 arranged at both ends of the inner side of the material distribution barrel 17, and a fan shaft 41 corresponding to the fan cover 37 is rotatably provided at the end of the material distribution barrel 17, and one end of the fan shaft 41 extends to the inner side of the fan cover 37 and is provided with fan blades 42, and a side wall at the lower end of the inner cavity of the crushing box 1 is provided with a mounting groove 32 corresponding to the material distribution barrel 17, and one end of the fan shaft 41 away from the fan blades 42 extends to the inner side of the mounting groove 32 and is provided with a gear. The inner wall of the mounting groove 32 is provided with a rack assembly meshing with the gear assembly, and the gear assembly and the rack assembly are configured so that when the dispensing barrel 17 moves back and forth, the fan shaft 41 always rotates in one direction. Specifically, the rack assembly includes a pair of racks 18 arranged at the upper and lower ends of the inner cavity of the mounting groove 32, and the two racks 18 in the same mounting groove 32 are arranged opposite to each other, and the two racks 18 are in different vertical planes. The gear assembly includes a fixed arrangement on the fan shaft 41 away from the fan blades 42 A pair of one-way bearings 19 are provided at one end, and a gear 34 corresponding to the rack 18 is fixedly provided on the outer wall of the one-way bearing 19. The two one-way bearings 19 at the same end can rotate in opposite directions. Dust hoods 38 for dust collection are provided at both ends of the bottom of the distributing barrel 17. A dustproof net 39 is provided at the bottom of the dust hood 38. The end of the fan cover 37 away from the gear 34 is an air inlet, and the air inlet is connected to the dust hood 38 through a pipeline. When the fan blades 42 rotate, the powder can be sucked through the dust hood 38. Dust, the end side wall of the distribution barrel 17 is provided with a third through groove 40 corresponding to the mounting groove 32, and the side wall of the crushing box 1 is provided with a first through groove 6 connected with the mounting groove 32. The third through groove 40 and the first through groove 6 are used for discharging the gas in the fan cover 37 to the outside. In order to prevent particles from entering the mounting groove 32, a blocking plate 14 for blocking the mounting groove 32 is provided on the end side wall of the distribution barrel 17, and the blocking plate 14 always blocks the mounting groove 32 when the distribution barrel 17 moves back and forth.

[0042] In order to prevent the dust-proof net 39 from being blocked, a scraper 35 corresponding to the dust-proof net 39 is provided at the lower end of the inner cavity of the crushing box 1, and the dust-proof net 39 can pass through and be scraped by the scraper 35 when it moves.

[0043] When in use, the reduction motor 3 is controlled to drive the synchronous wheel 5 to rotate. Under the action of the synchronous belt 4, another synchronous wheel 5 drives the main shaft 8 to rotate. The main shaft 8 drives the crushing ring hammer 7 to rotate, and the coal to be crushed is added to the inside from the feeding port at the upper end of the crushing box 1. The rotating crushing ring hammer 7 cooperates with the screen plate 10 to shear, squeeze, grind the coal, and further crush the interaction between the materials. Qualified particles fall through the drop chute 22 on the screen plate 10, and unqualified particles continue to be broken. In addition, when the main shaft 8 rotates, it will also drive the incomplete gears 20 at both ends to rotate. Due to the action of the gear teeth on the upper and lower sides of the traction plate frame 11, the traction plate frame 11 can be driven by the incomplete gear 20 to reciprocate and move horizontally, and then the first connecting plate 12 reciprocates. The first connecting plate 12 can move horizontally, and the driving shaft 30 is connected in the driving groove 29, so the first connecting plate 12 can drive the blocking slide 13 to move back and forth through the action of the driving groove 29 and the driving shaft 30, and the blocking slide 13 can drive the slide bar 21 to slide on the bottom wall of the screen plate 10 through the movable connection relationship between the adjusting long groove 28 and the convex shaft 25, during which the convex shaft 25 can be relatively displaced with the adjusting long groove 28 to meet the arc displacement of the slide bar 21, and the slide bar 21 drives the anti-blocking block 26 to move between adjacent reinforcing ribs 23, and the reinforcing ribs 23 can clear the materials in the blanking trough 22. Since the reinforcing ribs 23 are cylindrical and the two sides of the anti-blocking block 26 are inclined surfaces, the anti-blocking block 26 can squeeze the materials in the blanking trough 22 upward when it moves to the reinforcing ribs 23;

[0044] If the gap between the sieve plate 10 and the crushing ring hammer 7 is to be adjusted, the second connecting plate 24 is made vertical, the lifting device 9 is controlled to drive the sieve plate 10 to rise and fall, and the sieve plate 10 drives the slide bar 21 to move as a whole, so that the position of the convex shaft 25 in the adjusting long groove 28 changes, and then the gap between the sieve plate 10 and the crushing ring hammer 7 can be changed, thereby changing the discharge particle size. When the gap between the sieve plate 10 and the crushing ring hammer 7 increases, the material is more likely to be discharged through the sieve plate 10 after being impacted and sheared, so the discharge particle size will increase accordingly. When the gap between the sieve plate 10 and the crushing ring hammer 7 decreases, the material is more difficult to be discharged through the sieve plate 10 after being impacted and sheared, so the discharge particle size will decrease accordingly.

[0045] It should be noted that due to the effects of the adjusting plate 27, the adjusting long groove 28 and the convex shaft 25, after adjusting the gap between the screen plate 10 and the crushing ring hammer 7, the blocking slide plate 13 can still drive the slide bar 21 to slide back and forth on the bottom wall of the screen plate 10, and the height of the adjusting long groove 28 can be set to be much larger than the diameter of the convex shaft 25;

[0046] In addition, when the first connecting plate 12 moves back and forth, it will also drive the material distribution barrel 17 to move back and forth through the connecting arm 36. The materials falling from the screen plate 10 are collected in the material distribution barrel 17 under the action of the first guide plate 15 and the second guide plate 16. The material distribution barrel 17 moves back and forth to achieve uniform accumulation of materials in the receiving hopper 2.

[0047] When the distributing barrel 17 moves laterally, the fan shaft 41 will drive the gear 34 to move laterally in the mounting groove 32, and the gear 34 will mesh with the rack 18. Therefore, the gear 34 will rotate when it is displaced, and then the fan blades 42 will be driven to rotate through the fan shaft 41. Moreover, each fan shaft 41 corresponds to a pair of gears 34, and the pair of gears 34 are rotatably connected to the fan shaft 41 through a one-way bearing 19, and the two one-way bearings 19 can rotate in opposite directions, and the two racks 18 in the mounting groove 32 are respectively meshed with the two gears 34. Therefore, when it moves in one direction, one of the gears 34 drives the fan shaft 41 to rotate. At this time, although the other gear 34 is meshed with the rack 18, it will be meshed with the fan The shaft 41 rotates relatively, so it does not play a driving role. The same is true when it moves in the other direction. The two gears 34 drive the fan shaft 41 to rotate back and forth, ensuring that the direction of the fan shaft 41 remains unchanged. The fan blades 42 rotate to generate negative pressure, which is connected to the dust hood 38 through a pipe, and then the dust hood 38 sucks the dust raised by the falling materials. The dust is filtered by the dustproof net 39, and the gas is discharged to the outside through the first through groove 6 and the third through groove 40. In addition, when the distributing barrel 17 moves, it will pass through the scraper 35, and then the scraper 35 can scrape off the dust on the dustproof net 39 to avoid clogging of the dustproof net 39. At this time, the scraped dust is less affected by the airflow, so the lifting amplitude is relatively small.

[0048] The above shows and describes the basic principles and main features of the present invention and the advantages of the present invention. It should be understood by those skilled in the art that the present invention is not limited by the above embodiments, and the above embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, and these changes and improvements all fall within the scope of the present invention to be protected.

Claims

1. A coal crushing and screening device for a thermal power plant, comprising a crushing box (1), an arc-shaped screen plate (10) arranged at the upper end of the inner side of the crushing box (1), a main shaft (8) rotatably arranged at the upper end of the screen plate (10), and a crushing ring hammer (7) fixedly arranged on the main shaft (8), characterized in that: The sieve plate (10) is provided with an arc-shaped material drop groove (22), and the sieve plate (10) is provided with an anti-blocking mechanism for preventing the material drop groove (22) from being blocked, and the anti-blocking mechanism includes a slide bar (21) slidably connected to the bottom wall of the sieve plate (10), and an anti-blocking block (26) slidably matched with the material drop groove (22) is provided on the top of the slide bar (21), and the two sides of the upper end of the anti-blocking block (26) are inclined surfaces, and cylindrical reinforcing ribs (23) are evenly arranged on the inner side of the material drop groove (22), and the anti-blocking block (26) is located between adjacent reinforcing ribs (23) in each material drop groove (22); The outer side of the crushing box (1) is provided with a linkage mechanism for driving the slide bar (21) to slide along the bottom wall of the screen plate (10) and to rotate in linkage with the main shaft (8), the linkage mechanism comprising an incomplete gear (20) arranged at both ends of the main shaft (8), the outer side of the crushing box (1) is slidably connected with a traction plate frame (11) corresponding to the incomplete gear (20), the traction plate frame (11) is located outside the incomplete gear (20), and the two ends of the traction plate frame (11) are arc-shaped, and the upper and lower ends of the inner side of the traction plate frame (11) are provided with gear teeth for intermittently meshing with the incomplete gear (20), the bottom of the traction plate frame (11) is provided with a first connecting plate (12), and the first connecting plate (12) is provided with a driving groove (29), The side wall of the crushing box (1) is provided with a straight slide groove (31), and a blocking slide plate (13) corresponding to the first connecting plate (12) is slidably connected to the inner side of the straight slide groove (31). A driving shaft (30) extending to the inner side of the driving groove (29) is provided on one side of the blocking slide plate (13), and the other side is connected to the end of the slide bar (21). An adjustment plate (27) is provided on the side of the blocking slide plate (13) close to the slide bar (21), and an adjustment long groove (28) is provided on the side of the adjustment plate (27) facing the slide bar (21). A convex shaft (25) for movably cooperating with the adjustment long groove (28) is provided at the end of the slide bar (21) located in the middle, so that when the main shaft (8) rotates, the slide bar (21) moves back and forth along the bottom wall of the screen plate (10).

2. The coal crushing and screening device for a thermal power plant according to claim 1, characterized in that: The main shaft (8) is driven to rotate by a driving source arranged outside the crushing box (1), and the driving source includes a reduction motor (3) arranged on one side of the crushing box (1), and the output end of the reduction motor (3) and one end of the main shaft (8) are both provided with synchronous wheels (5), and synchronous belts (4) are provided on the two synchronous wheels (5).

3. The coal crushing and screening device for a thermal power plant according to claim 1, characterized in that: The number of the slide bars (21) is multiple, and the slide bars (21) are evenly distributed at the bottom of the sieve plate (10), and the multiple slide bars (21) are connected as a whole through an arc-shaped second connecting plate (24).

4. The coal crushing and screening device for a thermal power plant according to claim 3, characterized in that: Lifting devices (9) corresponding to the ends of the screen plate (10) and used to drive the screen plate (10) to move vertically are arranged on both sides of the upper end of the inner cavity of the crushing box (1).

5. The coal crushing and screening device for a thermal power plant according to claim 1, characterized in that: The lower end of the crushing box (1) is provided with a uniform material distribution mechanism, which comprises a distribution barrel (17) arranged at the lower end of the inner cavity of the crushing box (1), and inclined guide plate assemblies are arranged at both ends of the top of the distribution barrel (17), and the guide plate assembly comprises a first guide plate (15) which is movably connected to both sides of the lower end of the inner cavity of the crushing box (1) and is hollow, and the inner side of the lower end of the first guide plate (15) is movably connected to a second guide plate (16), and the lower end of the second guide plate (16) is movably connected to the top edge of the distribution barrel (17), and the lower end of the first connecting plate (12) is fixedly provided with an "L"-shaped connecting arm (36), and the lower end side wall of the crushing box (1) is provided with a second through groove (33) corresponding to the connecting arm (36), and one end of the connecting arm (36) passes through the second through groove (33) and extends to the inner side of the crushing box (1) and is fixedly connected to the side wall of the distribution barrel (17).

6. The coal crushing and screening device for a thermal power plant according to claim 5, characterized in that: The uniform material distribution mechanism is provided with a dust suppression mechanism, and the dust suppression mechanism includes fan covers (37) arranged at both ends of the inner side of the material distribution barrel (17), and the ends of the material distribution barrel (17) are rotatably provided with a fan shaft (41) corresponding to the fan cover (37), one end of the fan shaft (41) extends to the inner side of the fan cover (37) and is provided with fan blades (42), and the side wall of the lower end of the inner cavity of the crushing box (1) is provided with a mounting groove (32) corresponding to the material distribution barrel (17), one end of the fan shaft (41) away from the fan blades (42) extends to the inner side of the mounting groove (32) and is provided with a gear assembly, and the inner wall of the mounting groove (32) is provided with a rack assembly meshing with the gear assembly, and the gear assembly and the rack assembly are configured so that when the material distribution barrel (17) moves to When the fan shaft (41) is reset, it always rotates in one direction. Dust hoods (38) for dust collection are provided at both ends of the bottom of the distribution barrel (17). A dustproof net (39) is provided at the bottom of the dust hood (38). The end of the fan hood (37) away from the gear (34) is an air inlet, and the air inlet is connected to the dust hood (38) through a pipeline. When the fan blades (42) rotate, dust can be sucked through the dust hood (38). The end side wall of the distribution barrel (17) is provided with a third through groove (40) corresponding to the mounting groove (32). The side wall of the crushing box (1) is provided with a first through groove (6) connected to the mounting groove (32). The third through groove (40) and the first through groove (6) are used for discharging gas in the fan hood (37) to the outside.

7. The coal crushing and screening device for a thermal power plant according to claim 6, characterized in that: The rack assembly comprises a pair of racks (18) arranged at the upper and lower ends of the inner cavity of the mounting groove (32), the two racks (18) in the same mounting groove (32) are arranged opposite to each other, and the two racks (18) are located in different vertical planes; The gear assembly comprises a pair of one-way bearings (19) fixedly arranged at one end of the fan shaft (41) away from the fan blades (42); a gear (34) corresponding to the rack (18) is fixedly arranged on the outer wall of the one-way bearing (19); and the two one-way bearings (19) at the same end can rotate in opposite directions.

8. The coal crushing and screening device for a thermal power plant according to claim 6, characterized in that: A scraper (35) corresponding to the dustproof net (39) is arranged at the lower end of the inner cavity of the crushing box (1), and the dustproof net (39) can pass through the scraper (35) and be scraped by the scraper (35) when the dustproof net (39) moves.

9. The coal crushing and screening device for a thermal power plant according to claim 6, characterized in that: The end side wall of the material distribution barrel (17) is provided with a blocking plate (14) for blocking the mounting groove (32), and when the material distribution barrel (17) moves back and forth, the blocking plate (14) is always in a blocking state for the mounting groove (32).

10. The coal crushing and screening device for a thermal power plant according to claim 5, characterized in that: The lower end of the crushing box (1) is provided with a receiving hopper (2) corresponding to the material distribution cylinder (17) and used for receiving materials.

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