Coal crushing and screening device for thermal power plant

Abstract

The present application relates to the field of thermal power generation, and specifically discloses a coal crushing and screening device for thermal power plants, which comprises a crushing box, an arc-shaped sieve plate arranged on the upper end of the inner side of the crushing box, a main shaft rotatably arranged on the upper end of the sieve plate, and a crushing ring hammer fixedly arranged on the main shaft, an arc-shaped material falling groove is arranged on the sieve plate, a jam-preventing mechanism for preventing the material falling groove from being blocked is arranged on the sieve plate, the jam-preventing mechanism comprises a sliding strip slidingly connected to the bottom wall of the sieve plate, and a jam-preventing block slidingly matched with the material falling groove is arranged on the top of the sliding strip, and a linkage mechanism for driving the sliding strip to slide along the bottom wall of the sieve plate and linked with the rotation of the main shaft is arranged on the outer side of the crushing box. The coal crushing and screening device for thermal power plants can clean the material falling groove on the sieve plate during crushing and screening, avoids blocking, and can push out the coal particles stuck in the material falling groove in cooperation with the reinforcing ribs in the material falling groove.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of thermal power generation, in particular to a coal crushing and screening device for thermal power plants. BACKGROUND

[0002] The ring hammer coal crusher is an impact rotor crusher with a crushing ring, widely used in thermal power plants and other places where coal needs to be finely crushed. Its working principle is to apply impact force, splitting shear force and extrusion force to the coal through the high-speed rotating rotor ring hammer, so that the coal generates mutual force between the ring hammer and the coal crushing plate, sieve plate and between the coal and coal, thereby crushing into particles of the required particle size.

[0003] The ring hammer coal crusher plays an important role in coal fine crushing, but the sieve plate clogging problem has always been a difficult problem. For relatively soft coal, it is easy to adhere or fill in the sieve plate during the crushing process. In addition, the coal particles are stuck in the sieve plate grid holes due to irregular shape or excessive size, and uneven or excessive feeding caused by improper operation, which will cause sieve plate clogging, which not only seriously affects the screening efficiency, but also forces the crushing device to stop for cleaning, which not only wastes time and effort, but also affects the overall production efficiency.

[0004] In addition, although the arc-shaped sieve plate design of the ring hammer coal crusher helps the rolling and screening of coal particles, it also causes material concentration problems. The material tends to gather at the lowest point of the arc on the sieve plate, resulting in low space utilization of the material receiving device, and even causing material accumulation and clogging, further affecting the normal operation of the crushing device. At the same time, material concentration also exacerbates the uneven stress of the material receiving device, increasing the risk of wear and failure.

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

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

[0007] To achieve the above purpose, the technical scheme adopted by the present application is as follows:

[0008] A coal crushing and screening device for thermal power plants, comprising a crushing box, an arc-shaped sieve plate arranged on the upper end of the inner side of the crushing box, a main shaft rotatably arranged on 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 falling groove, and the sieve plate is provided with an anti-clogging mechanism for preventing the material falling groove from being clogged, the anti-clogging mechanism comprises a sliding strip slidingly connected to the bottom wall of the sieve plate, the top of the sliding strip is provided with an anti-clogging block slidingly matched with the material falling groove, and the upper end of the anti-clogging block is provided with inclined surfaces on both sides, the inner side of the material falling groove is uniformly provided with cylindrical reinforcing ribs, and the anti-clogging block is located between adjacent reinforcing ribs in each material falling groove.

[0009] The linkage mechanism is arranged outside the crushing box for driving the slide bar to slide along the bottom wall of the sieve plate and is linked with the rotation of the main shaft, the linkage mechanism comprises an incomplete gear arranged at both ends of the main shaft, a traction plate frame corresponding to the incomplete gear is slidably connected to the outside of the crushing box, the traction plate frame is arc-shaped at both ends, and the upper and lower ends of the inner side of the traction plate frame are provided with gear teeth for intermittent engagement with the incomplete gear, the bottom of the traction plate frame is provided with a first connecting plate, the first connecting plate is provided with a driving groove, the side wall of the crushing box is provided with a straight sliding groove, the straight sliding groove is slidably connected with a blocking sliding plate corresponding to the first connecting plate, one side of the blocking sliding plate is provided with a driving shaft extending to the inside of the driving groove, the other side is connected with the end of the slide bar, and the side of the blocking sliding plate close to the slide bar is provided with an adjusting plate, the side of the adjusting plate facing the slide bar is provided with an adjusting long groove, and the end of the slide bar in the middle is provided with a convex shaft for active cooperation with the adjusting long groove, so that the slide bar reciprocatingly displaces along the bottom wall of the sieve plate when the main shaft rotates.

[0010] Preferably, the main shaft is driven to rotate by a driving source arranged outside the crushing box, the driving source comprises a speed reducer motor arranged on one side of the crushing box, the output end of the speed reducer motor and one end of the main shaft are provided with synchronous wheels, and the two synchronous wheels are provided with a synchronous belt.

[0011] Preferably, the number of slide bars is multiple, and the slide bars are uniformly distributed on the bottom of the sieve plate, and the multiple slide bars are connected into one body through the arc-shaped second connecting plate.

[0012] Preferably, the two sides of the upper end of the inner cavity of the crushing box are provided with lifting devices corresponding to the end of the sieve plate and used for driving the vertical displacement of the sieve plate.

[0013] Preferably, the lower end of the crushing box is provided with a uniform distribution mechanism, the uniform distribution mechanism comprises a distribution cylinder arranged at the lower end of the inner cavity of the crushing box, the two ends of the top of the distribution cylinder are provided with inclined flow guide plate assemblies, the flow guide plate assembly comprises a hollow first guide plate movably connected to the two sides of the lower end of the inner cavity of the crushing box, the inner side of the lower end of the first guide plate is movably connected with a second guide plate, the lower end of the second guide plate is movably connected to the top edge of the distribution cylinder, the lower end of the first connecting plate is fixedly provided with a connecting arm in the shape of "L", the lower end side wall of the crushing box is provided with a second through groove corresponding to the connecting arm, and one end of the connecting arm extends to the inner side of the crushing box through the second through groove and is fixedly connected with the side wall of the distribution cylinder.

[0014] Preferably, the uniform material distribution mechanism is equipped with a dust suppression mechanism, which includes fan hoods located at both ends of the inner side of the distribution cylinder. A fan shaft corresponding to the fan hood is rotatably mounted at the end of the distribution cylinder. One end of the fan shaft extends into the inner side of the fan hood and is equipped with fan blades. A mounting groove corresponding to the distribution cylinder is provided on the lower side wall of the crushing chamber. The end of the fan shaft away from the fan blades extends into the mounting groove and is equipped with a gear assembly. A rack assembly meshing with the gear assembly is provided on the inner wall of the mounting groove. The gear assembly and rack assembly are configured... When the material distribution cylinder moves back to its original position, the fan shaft always rotates in one direction. Both ends of the bottom of the material distribution cylinder are equipped with dust collection hoods for dust extraction. The bottom of the dust collection hood is equipped with a dustproof net. The end of the fan hood away from the gear is the air inlet, and the air inlet is connected to the dust collection hood through a pipe. When the fan blades rotate, dust can be extracted through the dust collection hood. The end side wall of the material distribution cylinder is provided with a third through groove corresponding to the mounting groove. The side wall of the crushing box is provided with a first through groove connected to the mounting groove. The third through groove and the first through groove are used for the gas in the fan hood to be discharged outward.

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

[0016] The gear assembly includes a pair of one-way bearings fixedly mounted on the end of the fan shaft away from the fan blades. The outer wall of the one-way bearings is fixedly provided with gears that correspond one-to-one with the rack. The two one-way bearings at the same end have opposite rotational directions.

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

[0018] Preferably, the end sidewall of the dispensing cylinder is provided with a sealing plate for blocking the mounting groove, and the sealing plate always blocks the mounting groove when the dispensing cylinder moves back and forth.

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

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

[0021] 1. The coal crushing and screening device for thermal power plants, through the linkage of the anti-blocking mechanism and the main shaft through the linkage mechanism, the material falling groove on the screen plate can be cleaned during crushing and screening, avoiding blockage, and the compact structure is easy to use. The anti-blocking block on both sides is inclined, which can push the coal particles stuck in the material falling groove out, reduce blockage, improve the discharging efficiency, and the adjustment adapter facilitates the adjustment of the linkage mechanism to the screen plate. When changing the gap between the screen plate and the crushing ring hammer, the linkage mechanism can still play a role.

[0022] 2. The coal crushing and screening device for thermal power plants, through the linkage of the uniform material distribution mechanism and the linkage mechanism, the falling material can be uniformly distributed during crushing and screening, ensuring the uniformity of the falling material during material receiving, improving the space utilization of the material receiving device, and the dust suppression mechanism can absorb and filter the dust raised by the falling material during the distribution of the uniform material distribution mechanism. The raising of dust can be greatly reduced, and the environmental pollution and the impact on the physical and mental health of workers can be reduced. BRIEF DESCRIPTION OF DRAWINGS

[0023] Figure 1 is a structural schematic diagram of the present application;

[0024] Figure 2 is a structural schematic diagram of another view of the present application;

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

[0026] Figure 4 is a structural schematic diagram of the present application Figure 3 after removing the crushing box;

[0027] Figure 5 is a structural schematic diagram of the present application crushing ring hammer and screen plate in a split state;

[0028] Figure 6 is a structural schematic diagram of the present application slide and screen plate in a split state;

[0029] Figure 7 is a structural schematic diagram of the present application drive shaft and first connecting plate in a split state;

[0030] Figure 8 is a structural schematic diagram of the present application Figure 3 crushing box;

[0031] Figure 9 is a structural schematic diagram of the present application dust suppression mechanism and uniform material distribution mechanism;

[0032] Figure 10 is a structural schematic diagram of the present application Figure 9Structure schematic diagram of another perspective on the basis;

[0033] Figure 11 Structure schematic diagram of the split state of the material distribution cylinder and dust suppression mechanism of the application;

[0034] Figure 12 Structure schematic diagram of the split state of the fan shaft and gear of the application.

[0035] In the figure: 1, crushing box; 2, receiving hopper; 3, speed reducer motor; 4, synchronous belt; 5, synchronous wheel; 6, first through slot; 7, crushing ring hammer; 8, main shaft; 9, lifting device; 10, sieve 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, material distribution cylinder; 18, rack; 19, one-way bearing; 20, incomplete gear; 21, slide bar; 22, material falling groove; 23, reinforcing rib; 24, second connecting plate; 25, convex shaft; 26, anti-blocking block; 27, adjusting plate; 28, adjusting long groove; 29, driving groove; 30, driving shaft; 31, straight slide groove; 32, mounting groove; 33, second through slot; 34, gear; 35, scraper; 36, connecting arm; 37, fan cover; 38, dust suction cover; 39, dustproof net; 40, third through slot; 41, fan shaft; 42, fan blade. DETAILED DESCRIPTION

[0036] In order to make the technical means, creative features, purposes and effects of the application easy to understand, the following further describes the application in combination with specific embodiments.

[0037] As Figures 1-6The utility model discloses a coal crushing and screening device for thermal power plant, including crushing box 1, the screen plate 10 of arc shape who sets up in the inside upper end of crushing box 1, the main shaft 8 of rotation setting in the upper end of screen plate 10 and the crushing ring hammer 7 of fixed setting in the main shaft 8, the top of crushing box 1 is provided with the feed inlet, and the bottom is provided with the receiving hopper 2, and the main shaft 8 is driven to rotate by the drive source setting in the outside of crushing box 1, and the drive source includes the speed reducer motor 3 setting in the one side of crushing box 1, and the output of speed reducer motor 3 and the one end of main shaft 8 are all provided with synchronous wheel 5, and is provided with synchronous belt 4 on two synchronous wheel 5, and the screen plate 10 is provided with the arc shape of falling chute 22, and the screen plate 10 is provided with the anti-blocking mechanism for preventing the clogging of falling chute 22, and the anti-blocking mechanism includes the slide bar 21 slidingly connected to the bottom wall of screen plate 10, the number of slide bar 21 is multiple, and slide bar 21 evenly distributes in the bottom of screen plate 10, and multiple slide bar 21 is connected as a whole through the arc shape of second connecting plate 24, specifically, the screen plate 10 bottom is provided with the arc shape of guide rail, and the slide bar 21 is movably connected to the outside of the guide rail, and the top of slide bar 21 is provided with the anti-blocking block 26 of sliding cooperation with falling chute 22, and the both sides of anti-blocking block 26 upper end are inclined surface, and the inside of falling chute 22 is evenly provided with the cylindrical reinforcing rib 23, and the anti-blocking block 26 is located between every falling chute 22 adjacent reinforcing rib 23;

[0038] As Figures 3-8As shown, in order to realize the displacement of the slide 21, a linkage mechanism for driving the slide 21 to slide along the bottom wall of the sieve plate 10 and linked with the rotation of the main shaft 8 is arranged outside the crushing box 1, the linkage mechanism comprises an incomplete gear 20 arranged at both ends of the main shaft 8, a traction plate frame 11 corresponding to the incomplete gear 20 is slidingly connected outside the crushing box 1, specifically, a linear guide rail is arranged on the side wall of the crushing box 1, the traction plate frame 11 is movably connected with the linear guide rail, 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, the upper and lower ends of the inner side of the traction plate frame 11 are both provided with teeth for intermittent engagement with the incomplete gear 20, and after the incomplete gear 20 is separated from the teeth on one side, it can be engaged with the teeth on the other side, a first connecting plate 12 is arranged at the bottom of the traction plate frame 11, a driving groove 29 is arranged on the first connecting plate 12, a straight sliding groove 31 is arranged on the side wall of the crushing box 1, a blocking sliding plate 13 corresponding to the first connecting plate 12 is slidingly connected inside the straight sliding groove 31, the blocking sliding plate 13 facilitates the blocking of the straight sliding groove 31 to prevent dust and material from leaking, and the two ends of the blocking sliding plate 13 are located inside the ends of the straight sliding groove 31, and the blocking sliding plate 13 can always completely block the straight sliding groove 31 when it is displaced, a driving shaft 30 extending to the inside of the driving groove 29 is arranged on one side of the blocking sliding plate 13, the other side is connected with the end of the slide 21, an adjusting plate 27 is arranged on the side of the blocking sliding plate 13 close to the slide 21, an adjusting long groove 28 is arranged on the side of the adjusting plate 27 facing the slide 21, and the end of the slide 21 located in the middle is provided with a convex shaft 25 for active cooperation with the adjusting long groove 28, the height of the adjusting long groove 28 is greater than the diameter of the convex shaft 25, so that the slide 21 reciprocatingly displaces along the bottom wall of the sieve plate 10 when the main shaft 8 rotates.

[0039] As shown in the drawings, Figures 3-4 In order to realize the adjustment of the gap between the crushing ring hammer 7 and the sieve plate 10, lifting devices 9 corresponding to the ends of the sieve plate 10 and used for driving the sieve plate 10 to vertically displace are arranged on both sides of the upper end of the inner cavity of the crushing box 1, the lifting devices 9 are preferably air cylinders or hydraulic cylinders, or other driving devices that can drive the sieve plate 10 to lift can also be replaced;

[0040] Further, as shown in the drawings, Figures 3-4 , Figures 8-11As shown, the lower end of the crushing box 1 is provided with a uniform distribution mechanism, which includes a distribution cylinder 17 arranged at the lower end of the inner cavity of the crushing box 1. The distribution cylinder 17 is a rectangular cylinder body corresponding to the sieve plate 10. The top of the distribution cylinder 17 is provided with an inclined flow guide plate assembly at both ends. The flow guide plate assembly includes a first guide plate 15 movably connected to the lower end of the inner cavity of the crushing box 1 on both sides and in a hollow shape. The inner side of the lower end of the first guide plate 15 is movably connected with a second guide plate 16. The lower end of the second guide plate 16 is movably connected to the top edge of the distribution cylinder 17. The lower end of the first connecting plate 12 is fixedly provided with a connecting arm 36 in the shape of "L". The lower end of the side wall of the crushing box 1 is provided with a second through slot 33 corresponding to the connecting arm 36. One end of the connecting arm 36 extends to the inner side of the crushing box 1 through the second through slot 33 and is fixedly connected with the side wall of the distribution cylinder 17. The connecting arm 36 and the second through slot 33 are in sliding connection.

[0041] In addition, as shown in Figure 4 、 Figures 8-12 , a dust suppression mechanism is arranged on the uniform distribution mechanism. The dust suppression mechanism includes a fan cover 37 arranged at both ends of the inner side of the distribution cylinder 17. The end of the distribution cylinder 17 is 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 a fan blade 42. 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 distribution cylinder 17. One end of the fan shaft 41 away from the fan blade 42 extends to the inner side of the mounting groove 32 and is provided with a gear assembly. The inner wall of the mounting groove 32 is provided with a rack assembly engaged with the gear assembly. The gear assembly and the rack assembly are configured such that when the distribution cylinder 17 reciprocally displaces, 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. The two racks 18 in the same mounting groove 32 are oppositely arranged and are in different vertical planes. The gear assembly includes a pair of one-way bearings 19 fixedly arranged at one end of the fan shaft 41 away from the fan blade 42. The outer wall of the one-way bearing 19 is fixedly provided with a gear 34 corresponding to the rack 18. The rotatable directions of the two one-way bearings 19 at the same end are opposite. Both ends of the bottom of the distribution cylinder 17 are provided with dust suction covers 38 for dust suction. The bottom of the dust suction cover 38 is provided with a dust screen 39. One end of the fan cover 37 away from the gear 34 is an air inlet, and the air inlet is in communication with the dust suction cover 38 through a pipeline. The fan blade 42 can suck dust through the dust suction cover 38 when rotating. The end side wall of the distribution cylinder 17 is provided with a third through slot 40 corresponding to the mounting groove 32. The side wall of the crushing box 1 is provided with a first through slot 6 in communication with the mounting groove 32. The third through slot 40 and the first through slot 6 are used for the gas in the fan cover 37 to be discharged outward. In order to avoid particles entering the mounting groove 32, a blocking plate 14 is arranged on the end side wall of the distribution cylinder 17 for shielding the mounting groove 32. The blocking plate 14 is always in a shielding state for the mounting groove 32 when the distribution cylinder 17 reciprocally displaces.

[0042] In order to avoid the dust screen 39 blockage, the lower end of the inner cavity of the crushing box 1 is provided with a scraper 35 corresponding to the dust screen 39, and the dust screen 39 can pass through the scraper 35 and be scraped by the scraper 35 when it is displaced.

[0043] In use, the control of the reduction motor 3 drives the synchronous wheel 5 to rotate, and under the action of the synchronous belt 4, the other synchronous wheel 5 drives the main shaft 8 to rotate, and the main shaft 8 drives the crushing ring hammer 7 to rotate. The coal to be pulverized is added from the feed inlet at the upper end of the crushing box 1 to the inside, and the rotating crushing ring hammer 7 cooperates with the sieve plate 10 to realize the shearing, extrusion, grinding and mutual action between the materials to further crush the coal. The qualified particles fall through the discharge chute 22 on the sieve plate 10, and the unqualified particles continue to be broken. Moreover, when the main shaft 8 rotates, the two incomplete gears 20 at the ends are also driven to rotate. Due to the action of the wheel teeth on the upper and lower sides of the traction plate frame 11, the traction plate frame 11 can be driven by the incomplete gears 20 to reciprocate transversely, and the first connecting plate 12 reciprocates transversely. The drive shaft 30 is connected in the drive groove 29, so that the first connecting plate 12 can drive the blocking slide plate 13 to reciprocate by the action of the drive groove 29 and the drive shaft 30. The blocking slide plate 13 can drive the slide bar 21 to slide on the bottom wall of the sieve plate 10 by adjusting the movable connection relationship between the long groove 28 and the convex shaft 25. During this period, the convex shaft 25 can be relatively displaced with the long groove 28 to satisfy the arc-shaped displacement of the slide bar 21. The slide bar 21 drives the anti-blocking block 26 to displace between the adjacent reinforcing ribs 23. The reinforcing ribs 23 can dredge the material in the discharge chute 22. Since the reinforcing ribs 23 are cylindrical and the two sides of the anti-blocking block 26 are inclined, the anti-blocking block 26 can extrude the material in the discharge chute 22 upward when it is displaced 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 in a vertical state, the lifting device 9 drives the sieve plate 10 to ascend and descend, the sieve plate 10 drives the slide bar 21 to displace as a whole, and then the position of the convex shaft 25 in the long groove 28 changes, thereby changing the gap between the sieve plate 10 and the crushing ring hammer 7, so as to change the particle size of the discharged material. 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 particle size of the discharged material 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 particle size of the discharged material will decrease accordingly.

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

[0046] In addition, the first connecting plate 12 reciprocating displacement will also drive the distribution cylinder 17 reciprocating displacement through the connecting arm 36, the material falling from the sieve plate 10 is gathered into the distribution cylinder 17 under the action of the first guide plate 15 and the second guide plate 16, and the distribution cylinder 17 reciprocating displacement realizes the uniform accumulation of the material in the receiving hopper 2.

[0047] When the distribution cylinder 17 transversely moves, the gear 34 will be driven to transversely move in the mounting groove 32 through the fan shaft 41, the gear 34 is engaged with the rack 18, so that the gear 34 will rotate when it moves, and then the fan blade 42 is driven to rotate through the fan shaft 41, and 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 the one-way bearing 19, and the rotatable directions of the two one-way bearings 19 are opposite, and the two racks 18 in the mounting groove 32 are engaged with the two gears 34 respectively, so that when moving in one direction, one of the gears 34 drives the fan shaft 41 to rotate, at this time, the other gear 34 is engaged with the rack 18, but it will rotate relative to the fan shaft 41, so it does not play a driving role, and when moving in the other direction, the two gears 34 realize the function of driving the fan shaft 41 to rotate back and forth, ensuring that the fan shaft 41 does not change direction, the fan blade 42 rotates to generate negative pressure, and the dust cover 38 is connected through the pipeline to suck the dust raised by the falling material, the dust is filtered by the dust screen 39, the gas is discharged to the outside through the first through groove 6 and the third through groove 40, and the distribution cylinder 17 will pass through the scraper 35 when it moves, so that the scraper 35 can scrape the dust on the dust screen 39, avoiding the blockage of the dust screen 39, and at this time, the scraped dust is less affected by the airflow, so the raising amplitude is relatively small.

[0048] The above shows and describes the basic principles and main features of the present application and the advantages of the present application. Those skilled in the art should understand that the present application is not limited to the above-mentioned embodiments, and the above-mentioned embodiments and descriptions in the specification are only to illustrate the principles of the present application, and various changes and improvements can be made without departing from the spirit and scope of the present application, and these changes and improvements all fall within the scope of the claimed present application.

Claims

1. A coal crushing and screening device for thermal power plants, comprising a crushing box (1), a sieve plate (10) arranged on the upper end of the inside of the crushing box (1) and in an arc shape, a main shaft (8) rotatably arranged on the upper end of the sieve plate (10), and a crushing ring hammer (7) fixedly arranged on the main shaft (8), characterized in that: The screen plate (10) is provided with an arc-shaped material falling groove (22), and the screen plate (10) is provided with an anti-blocking mechanism for preventing the material falling groove (22) from being blocked, the anti-blocking mechanism comprising a sliding strip (21) slidingly connected to the bottom wall of the screen plate (10), and the top of the sliding strip (21) is provided with an anti-blocking block (26) in sliding cooperation with the material falling groove (22); the outer side of the crushing box (1) is provided with a linkage mechanism for driving the sliding strip (21) to slide along the bottom wall of the screen plate (10) and to be linked with the rotation of the main shaft (8), the linkage mechanism comprising an incomplete gear (20) arranged at both ends of the main shaft (8), and the outer side of the crushing box (1) is slidingly connected with a traction plate rack (11) corresponding to the incomplete gear (20), the traction plate rack (11) is located outside the incomplete gear (20), and the two ends of the traction plate rack (11) are arc-shaped, the inner side of the traction plate rack (11) is provided with gear teeth at the upper end and the lower end for intermittent engagement with the incomplete gear (20), and the bottom of the traction plate rack (11) is provided with a first connecting plate (12); The lower end of the crushing box (1) is provided with a uniform material distribution mechanism, the uniform material distribution mechanism comprising a material distribution cylinder (17) arranged at the lower end of the inner cavity of the crushing box (1), and the top of the material distribution cylinder (17) is provided with an inclined flow guide plate assembly, the flow guide plate assembly comprising a first guide plate (15) movably connected to the lower end of the inner cavity of the crushing box (1) and in a hollow shape, the inner side of the lower end of the first guide plate (15) is movably connected with a second guide plate (16), the lower end of the second guide plate (16) is movably connected to the top edge of the material distribution cylinder (17), the lower end of the first connecting plate (12) is fixedly provided with a connecting arm (36) in an "L" shape, 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) extends to the inner side of the crushing box (1) through the second through groove (33) and is fixedly connected with the side wall of the material distribution cylinder (17). The uniform distribution mechanism is provided with a dust suppression mechanism, the dust suppression mechanism comprises a fan cover (37) arranged at both ends of the inside of a distribution cylinder (17), the end of the distribution cylinder (17) is rotationally provided with a fan shaft (41) corresponding to the fan cover (37), one end of the fan shaft (41) extends to the inside of the fan cover (37) and is provided with a fan blade (42), 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 distribution cylinder (17), one end of the fan shaft (41) away from the fan blade (42) extends to the inside of the mounting groove (32) and is provided with a gear assembly, the inner wall of the mounting groove (32) is provided with a rack assembly engaged with the gear assembly, 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 oppositely arranged, and the two racks (18) are 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 blade (42), the outer wall of the one-way bearing (19) is fixedly provided with a gear (34) corresponding to the rack (18) in one-to-one manner, and the rotatable directions of the two one-way bearings (19) at the same end are opposite; both ends of the bottom of the distribution cylinder (17) are provided with dust suction covers (38) for dust suction, the bottom of the dust suction cover (38) is provided with a dust screen (39), one end of the fan cover (37) away from the gear (34) is an air inlet, and the air inlet is in communication with the dust suction cover (38) through a pipeline.

2. A coal crushing and screening device for thermal power plants as claimed in claim 1, wherein: The upper end of the anti-blocking block (26) is inclined, the inside of the blanking groove (22) is uniformly provided with cylindrical reinforcing ribs (23), and the anti-blocking block (26) is located between adjacent reinforcing ribs (23) in each blanking groove (22); 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 sliding groove (31), the inside of the straight sliding groove (31) is slidably connected with a blocking sliding plate (13) corresponding to the first connecting plate (12), one side of the blocking sliding plate (13) is provided with a driving shaft (30) extending to the inside of the driving groove (29), the other side is connected with the end of the sliding bar (21), and the side of the blocking sliding plate (13) close to the sliding bar (21) is provided with an adjusting plate (27). The side of the adjusting plate (27) facing the sliding bar (21) is provided with an adjusting long groove (28), and the end of the sliding bar (21) located in the middle is provided with a convex shaft (25) for active cooperation with the adjusting long groove (28), so that the sliding bar (21) reciprocally displaces along the bottom wall of the sieve plate (10) when the main shaft (8) rotates.

3. A coal crushing and screening device for thermal power plants as claimed in claim 1, wherein: The main shaft (8) is driven to rotate by a driving source arranged outside the crushing box (1), the driving source comprises a speed reducer motor (3) arranged on one side of the crushing box (1), the output end of the speed reducer motor (3) and one end of the main shaft (8) are provided with synchronous wheels (5), and the two synchronous wheels (5) are provided with a synchronous belt (4).

4. A coal crushing and screening device for thermal power plants as claimed in claim 1, wherein: The number of the sliding bars (21) is multiple, and the sliding bars (21) are uniformly distributed on the bottom of the sieve plate (10), and the multiple sliding bars (21) are connected into an integrated body through the arc-shaped second connecting plates (24).

5. A coal crushing and screening device for thermal power plants as claimed in claim 4, wherein: The lifting devices (9) corresponding to the end portions of the sieve plate (10) and used for driving the vertical displacement of the sieve plate (10) are arranged on the two sides of the upper end of the inner cavity of the crushing box (1).

6. A coal crushing and screening device for thermal power plants as claimed in claim 1, wherein: The end side wall of the distributing cylinder (17) is provided with a third through groove (40) corresponding to the mounting groove (32), the sidewall of the crushing box (1) is provided with a first through groove (6) in communication with the mounting groove (32), and the third through groove (40) and the first through groove (6) are used for the outward discharge of the gas in the fan cover (37).

7. A coal crushing and screening device for thermal power plants as claimed in claim 1, wherein: The lower end of the inner cavity of the crushing box (1) is provided with a scraper (35) corresponding to the dustproof net (39), and the dustproof net (39) can pass through and be scraped by the scraper (35) when being displaced.

8. A coal crushing and screening device for thermal power plants as claimed in claim 1, wherein: The end side wall of the distributing cylinder (17) is provided with a plugging plate (14) used for shielding the mounting groove (32), and the plugging plate (14) is always in a shielding state for the mounting groove (32) when the distributing cylinder (17) reciprocally displaces.

9. A coal crushing and screening device for thermal power plants as claimed in claim 1, wherein: The lower end of the crushing box (1) is provided with a material receiving hopper (2) corresponding to the distributing cylinder (17) and used for receiving materials.

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