Pulverized coal screening equipment for thermal power plant

Abstract

The invention relates to the technical field of pulverized coal screening, and discloses a thermal power plant pulverized coal screening device which comprises a shell, the top of the shell is fixedly connected with a feeding pipe communicating with the interior of the shell, a grinding assembly for conducting auxiliary grinding on pulverized coal is arranged in the feeding pipe, and the inner walls of the two sides of the shell are each fixedly connected with two fixing blocks; sliding holes are formed in the tops of the multiple fixing blocks, supporting rods are slidably connected into the sliding holes, and a first filter plate inclining downwards is fixedly connected to the top ends of the supporting rods. According to the coal ash screening device, coal ash with the diameter smaller than 20 micrometers can be absorbed, so that secondary screening of the coal ash is not needed, the screening efficiency of the coal ash is improved, the coal ash can be pulverized in an auxiliary mode, the size of the coal ash is reduced, and the using effect of the screening device is improved; and coal ash can be prevented from being accumulated in filter holes of the second filter plate to block the filter holes to affect air outlet of the fan, and normal use of the ash suction mechanism is guaranteed.

Description

Technical Field

[0001] The invention relates to the technical field of coal powder screening, in particular to coal powder screening equipment for a thermal power plant. Background Art

[0002] A thermal power plant, also known as a thermal power plant, is a factory that uses combustibles (such as pulverized coal) as fuel to produce electricity. When burned, the combustibles heat water to generate steam, converting the chemical energy of the fuel into thermal energy. The steam pressure drives the turbine to rotate, converting the thermal energy into mechanical energy. The turbine then drives the generator to rotate, converting the mechanical energy into electrical energy.

[0003] After searching, a Chinese patent with publication number CN219664402U discloses a coal powder screening device for a thermal power plant. It does not need to manually take out the screening bin to clean large-particle coal blocks. It can continuously transport materials to the feed port for screening. There is no need to pause during the screening process, which can save users a lot of working time and increase work efficiency. However, there are still the following defects. The fineness of the coal powder used in the thermal power plant is greater than 20 microns and less than 50 microns. Although it can screen out oversized particles, it cannot absorb coal powder smaller than 20 microns, and it needs to be screened twice to meet the demand, resulting in low screening efficiency. Summary of the invention

[0004] Technical issues solved

[0005] In view of the shortcomings of the prior art, the present invention provides a coal powder screening equipment for a thermal power plant, which is mainly used to solve the problem that the fineness of the coal powder used in thermal power plants is greater than 20 microns and less than 50 microns. Although it can screen out oversized particles, it cannot absorb coal powder smaller than 20 microns and requires secondary screening to meet the demand, resulting in low screening efficiency.

[0006] Technical Solution

[0007] To achieve the above object, the present invention provides the following technical solutions:

[0008] A coal powder screening device for a thermal power plant comprises a shell, a feed pipe connected to the inside of the shell is fixedly connected to the top of the shell, a crushing assembly for auxiliary crushing of the coal powder is arranged in the feed pipe, two fixed blocks are fixedly connected to the inner walls on both sides of the shell, a plurality of the fixed blocks are provided with sliding holes on the tops, a support rod is slidably connected in the sliding holes, a first filter plate inclined downward is fixedly connected to the top of the support rod, a connecting frame is fixedly connected to the bottom of the first filter plate, a guide groove is arranged on one side of the connecting frame, a motor is fixedly connected to the outer wall of one side of the shell, one end of the motor output shaft passes through the shell and is connected to a worm through a coupling, one end of the worm is fixedly connected to a rotating disk, a connecting column moving along the groove direction of the guide groove is fixedly connected to one side of the rotating disk at an eccentric position, an ash suction mechanism for extracting coal powder less than 20 microns is arranged at the bottom of the shell, a discharge port for discharging the coal powder on the first filter plate is arranged on one side of the shell, a door panel is rotatably connected in the discharge port, and a scraping assembly for discharging the filtered coal powder is arranged in the shell.

[0009] Furthermore, the crushing assembly includes a support frame, which is fixedly connected to the top outer wall of the feed pipe, and the top of the support frame is fixedly connected to an electric telescopic rod, one end of the telescopic portion of the electric telescopic rod passes through the feed pipe and is fixedly connected to a force arm, the bottom of the force arm is rotatably connected to a downwardly inclined push plate, one side of the push plate is provided with a mounting groove, and a rolling roller is rotatably connected in the mounting groove, and a second downwardly inclined guide plate is fixedly connected to the inner wall of one side of the feed pipe below the rolling roller.

[0010] Based on the above scheme, the outer side of the force arm is fixedly connected to a downward-inclined first guide plate at a position above the push plate, two springs are fixedly connected to the bottom of the first guide plate, and the springs are fixed to the second guide plate, the upper surface of the second guide plate is fixedly connected to two material blocking rods, and the rolling roller is located between the two material blocking rods.

[0011] As a further scheme of the present invention, the dust suction mechanism includes a collecting shell, which is fixedly connected to the top outer wall of the shell, and the top of the shell is located in the collecting shell. Two mounting holes are provided, and a guide pipe is fixedly connected in the mounting hole, and a fan is fixedly connected in the guide pipe. Two cover plates for closing the guide pipe are rotatably connected to the top of the guide pipe. A mounting port is provided on one side of the collecting shell, and a mounting frame is rotatably connected in the mounting port, and a second filter plate is inserted in the mounting frame. Two L-shaped rods are fixedly connected at the bottom of one side of the mounting frame at a position inside the collecting shell, and guide rods for resisting the L-shaped rods are fixedly connected to the inner walls on both sides of the collecting shell, and a cleaning component for cleaning the second filter plate is provided in the collecting shell.

[0012] Furthermore, the cleaning assembly includes a brush, which is slidably connected between two guide rods, the bottom of the brush is fixedly connected to a fixed frame, the collecting shell is fixedly connected to the guide frame, a sliding seat is slidably connected in the guide frame, and the sliding seat is fixed to the fixed frame, a reciprocating screw is rotatably connected in the guide frame, and the reciprocating screw passes through the sliding seat and is threadedly connected to the sliding seat, the bottom end of the reciprocating screw passes through the shell and is connected to a connecting shaft through a coupling, and the connecting shaft passes through the first filter plate, the bottom end of the connecting shaft is keyed to a worm gear, and the worm gear is meshed with the worm.

[0013] On the basis of the above-mentioned scheme, the scraper assembly includes a scraper, which is slidably connected to the bottom inner wall of the shell, and one side of the scraper is fixedly connected to two connecting rods for pulling the scraper to move. A discharge port is opened at the bottom position on one side of the shell, and the scraper is at the same height as the discharge port, and a baffle is inserted in the discharge port to close the discharge port.

[0014] As a further solution of the present invention, a material guide plate is rotatably connected to the bottom outer wall of the shell, and a side outer wall of the shell is provided with a blocking component for fixing the material guide plate, the door plate and the baffle plate.

[0015] Furthermore, the blocking assembly includes two cams, both of which are rotatably connected to the outer wall of one side of the shell, and the two cams respectively block the door panel and the baffle plate. Two notches are provided on one side of the cam located at the bottom, and a groove is provided on one side of the guide plate. The cam extends into the groove, and the guide plate extends into the notch, so that the cam blocks the guide plate.

[0016] Beneficial Effects

[0017] Compared with the prior art, the present invention provides a coal powder screening device for a thermal power plant, which has the following beneficial effects:

[0018] 1. Through the setting of the ash suction mechanism, when filtering the coal ash, the coal ash with a diameter less than 20 microns can be absorbed and extracted through the ash suction mechanism, so that the coal ash with a diameter less than 20 microns can be absorbed, so that the coal ash does not need to be screened for the second time, thereby improving the screening efficiency of the coal ash.

[0019] 2. Through the setting of the crushing component, when the coal ash is fed through the feed pipe, the crushing component will crush the coal ash, thereby auxiliary crushing of the coal ash, reducing the volume of the coal ash, and improving the use effect of the screening equipment.

[0020] 3. By setting up the cleaning component, the second filter plate is cleaned using the cleaning component, thereby preventing coal ash from accumulating in the filter holes of the second filter plate and blocking the filter holes to affect the air outlet of the fan, thereby ensuring the normal use of the ash suction mechanism. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 A schematic diagram of the three-dimensional structure of a coal powder screening device for a thermal power plant proposed by the present invention;

[0022] Figure 2 This is a schematic diagram of the internal structure of a coal powder screening device for a thermal power plant proposed by the present invention;

[0023] Figure 3 This is a schematic diagram of the enlarged structure of part A of a coal powder screening device for a thermal power plant proposed by the present invention;

[0024] Figure 4 This is a schematic diagram of the enlarged structure of part B of a coal powder screening device for a thermal power plant proposed by the present invention;

[0025] Figure 5 This is a schematic diagram of the cross-sectional structure of a feed pipe of a coal powder screening device for a thermal power plant proposed by the present invention;

[0026] Figure 6 This is a schematic cross-sectional structure diagram of an ash suction mechanism of a coal powder screening device for a thermal power plant proposed by the present invention;

[0027] Figure 7 The present invention is a schematic diagram of the cross-sectional structure of a guide tube of a coal powder screening device for a thermal power plant.

[0028] In the figure: 1, shell; 2, ash suction mechanism; 3, feed pipe; 4, door plate; 5, guide plate; 6, first filter plate; 7, scraper; 8, connecting rod; 9, connecting shaft; 10, support rod; 11, baffle; 12, connecting frame; 13, worm gear; 14, worm; 15, rotating disk; 16, connecting column; 17, notch; 18, cam; 19, groove; 20, electric telescopic rod; 21, support frame; 22, force arm; 23, push plate; 24, first guide plate; 25, spring; 26, rolling roller; 27, material blocking rod; 28, second guide plate; 29, mounting frame; 30, guide rod; 31, second filter plate; 32, L-shaped rod; 33, slide seat; 34, guide frame; 35, guide pipe; 36, brush; 37, fixed frame; 38, reciprocating screw; 39, fan; 40, cover plate. DETAILED DESCRIPTION

[0029] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0030] Reference Figure 1-Figure 7A coal powder screening device for a thermal power plant comprises a shell 1, a feed pipe 3 connected to the inside of the shell 1 is fixed to the top of the shell 1 by bolts, a crushing assembly for auxiliary crushing of the coal powder is arranged in the feed pipe 3, two fixing blocks are welded to the inner walls of both sides of the shell 1, a sliding hole is opened on the top of the plurality of fixing blocks, a support rod 10 is slidably connected in the sliding hole, a first filter plate 6 tilted downward is fixed to the top of the support rod 10 by bolts, and the filter hole diameter of the first filter plate 6 is greater than 20 microns and less than 50 microns, and the first filter plate 6 The bottom of the housing 1 is fixed with a connecting frame 12 by bolts, one side of the connecting frame 12 is provided with a guide groove, one side of the outer wall of the housing 1 is fixed with a motor by bolts, one end of the motor output shaft passes through the housing 1 and is connected to a worm 14 through a coupling, one end of the worm 14 is fixed with a rotating disk 15 by bolts, one side of the rotating disk 15 is welded with a connecting column 16 at an eccentric position that moves along the groove direction of the guide groove, and the bottom of the housing 1 is provided with an ash suction mechanism 2 for extracting coal powder less than 20 microns, and the coal ash is added to the feed The crushing assembly crushes the fly ash into the housing 1. The fly ash with a diameter less than 20 microns is extracted by the ash suction mechanism 2. At the same time, the motor is started, the motor drives the worm 14 to rotate, the worm 14 drives the rotating disk 15 to rotate, and the rotating disk 15 drives the connecting column 16 to move along the groove direction of the guide groove during the rotation process, so that the connecting frame 12 reciprocates up and down, and the connecting frame 12 drives the first filter plate 6 to move up and down through the support rod 10. The first filter plate 6 is shaken up and down to screen the coal ash, so that the coal ash with a diameter less than 20 microns can be absorbed, so that there is no need for secondary screening of the coal ash, thereby improving the screening efficiency of the coal ash. A discharge port for discharging the coal powder on the first filter plate 6 is provided on one side of the shell 1. A door panel 4 is rotatably connected to the discharge port. When the door panel 4 is opened, the coal ash with a diameter greater than 50 microns remaining on the first filter plate 6 can be cleaned and collected. A scraping component for discharging the filtered coal powder is provided in the shell 1.

[0031] In the present invention, the crushing assembly includes a support frame 21, which is fixed to the top outer wall of the feed pipe 3 by bolts, and an electric telescopic rod 20 is fixed to the top of the support frame 21 by bolts. One end of the telescopic portion of the electric telescopic rod 20 passes through the feed pipe 3 and is fixed to a force arm 22 by bolts. The bottom of the force arm 22 is rotatably connected to a downwardly inclined push plate 23, one side of the push plate 23 is provided with a mounting groove, and a rolling roller 26 is rotatably connected in the mounting groove. A downwardly inclined second guide plate 28 is fixed by bolts at a position below the rolling roller 26 on the inner wall of one side of the feed pipe 3, and a downwardly inclined first guide plate 24 is fixed by bolts at a position above the push plate 23 on the outer side of the force arm 22. Two springs 25 are welded to the bottom of the first guide plate 24, and the spring 25 is fixed to the second guide plate 28. Two material blocking rods 27 are welded to the upper surface of the second guide plate 28, and the rolling roller 26 is located between the two material blocking rods 27, so that fly ash is added to the feed pipe 3 , and at the same time, the electric telescopic rod 20 is started to extend and retract, and the electric telescopic rod 20 will drive the power arm 22 to reciprocate up and down, and the force arm 22 will drive the first guide plate 24 and the push plate 23 to move. When the push plate 23 moves downward, the rolling roller 26 will contact the second guide plate 28, and at this time, the force arm 22 will squeeze and move downward, so that the push plate 23 will rotate upward and squeeze the spring 25, and at the same time, the rolling roller 26 will roll to crush the coal ash on the second guide plate 28. When the force arm 22 moves upward, the push plate 23 will reset and rotate downward under the action of gravity and the spring 25, and then the force arm 22 drives the rolling roller 26 on the push plate 23 to separate from the second guide plate 28, so that the crushed coal ash falls onto the first filter plate 6 in the housing 1. At the same time, under the action of the first guide plate 24, the coal ash can be guided so that the coal ash falls onto the second guide plate 28 to prevent the coal ash from falling onto the push plate 23;

[0032] In particular, the ash suction mechanism 2 includes a collecting shell, which is fixed to the top outer wall of the shell body 1 by bolts. Two mounting holes are provided at the top of the shell body 1 located inside the collecting shell. A guide tube 35 is fixed in the mounting hole by bolts. A fan 39 is fixed in the guide tube 35 by bolts. Two cover plates 40 for closing the guide tube 35 are rotatably connected to the top of the guide tube 35. A mounting port is provided on one side of the collecting shell, and a mounting frame 29 is rotatably connected in the mounting port. A lock for fixing the mounting frame 29 is provided on the top of the collecting shell. A second filter plate 31 is inserted in the mounting frame 29, and the filter hole diameter of the second filter plate 31 is less than 20 microns. The mounting frame 29 is Two L-shaped rods 32 are welded at the bottom of one side in the collecting shell. Guide rods 30 for resisting the L-shaped rods 32 are fixed to the inner walls of both sides of the collecting shell by bolts. A cleaning component for cleaning the second filter plate 31 is provided in the collecting shell. When the fan 39 is started, the fan 39 will extract the coal ash with a diameter less than 20 microns in the shell 1. At the same time, the wind generated by the fan 39 during extraction will blow the cover plate 40 to rotate slightly, thereby opening the cover plate 40 to allow the coal ash with a diameter less than 20 microns to enter the collecting shell. Since the diameter of the filter hole of the second filter plate 31 is less than 20 microns, the second filter plate 31 will block the coal ash in the collecting shell and allow air to enter. The cleaning assembly includes a brush 36, which is slidably connected between the two guide rods 30. The bottom of the brush 36 is fixed with a fixing frame 37 by bolts. The collecting shell is fixed with a guide frame 34 by bolts. A slide seat 33 is slidably connected in the guide frame 34, and the slide seat 33 is fixed with the fixing frame 37. A reciprocating screw rod 38 is rotatably connected in the guide frame 34, and the reciprocating screw rod 38 passes through the slide seat 33 and is threadedly connected to the slide seat 33. The bottom end of the reciprocating screw rod 38 passes through the housing 1 and is connected to a connecting shaft 9 through a coupling. The connecting shaft 9 passes through the first filter plate 6. The bottom end of the connecting shaft 9 is keyed to a worm gear 13, and the worm gear 13 is connected to the worm gear 13. The wheel 13 is meshed with the worm 14. The worm 14 drives the worm wheel 13 to rotate during the rotation process. The worm wheel 13 drives the connecting shaft 9 to rotate. The connecting shaft 9 drives the reciprocating screw 38 to rotate. The reciprocating screw 38 drives the sliding seat 33 to move back and forth along the guide frame 34 through the threaded meshing between the sliding seat 33. The sliding seat 33 drives the fixing frame 37 to move up and down. The fixing frame 37 drives the brush 36 to move back and forth along the guide rod 30. The brush 36 cleans the second filter plate 31 to prevent the coal ash from accumulating in the filter holes of the second filter plate 31 and blocking the filter holes to affect the air outlet of the fan 39, thereby ensuring the normal use of the ash suction mechanism 2.

[0033] The scraping assembly includes a scraper 7, which is slidably connected to the bottom inner wall of the shell 1. One side of the scraper 7 is fixed with two connecting rods 8 for pulling the scraper 7 to move by bolts. A discharge port is opened at the bottom of one side of the shell 1, and the scraper 7 is at the same height as the discharge port. A baffle 11 for closing the discharge port is inserted in the discharge port. The bottom outer wall of the shell 1 is rotatably connected with a guide plate 5. The outer wall of one side of the shell 1 is provided with a resisting assembly for fixing the guide plate 5, the door plate 4 and the baffle 11. The resisting assembly includes two cams 18. The two cams 18 are rotatably connected to the outer wall of one side of the shell 1. The two cams 18 resist the door plate 4 and the baffle 11 respectively. Two gaps are opened on one side of the cam 18 located at the bottom The opening 17 is formed, and a groove 19 is formed on one side of the guide plate 5. The cam 18 extends into the groove 19, and the guide plate 5 extends into the notch 17, so that the cam 18 resists the guide plate 5. The cam 18 is rotated so that the cam 18 no longer resists the door panel 4, the guide plate 5 and the baffle 11. At this time, the door panel 4 can be opened, and the guide plate 5 is rotated downward so that the guide plate 5 is in an inclined state. Then the baffle 11 is taken out from the discharge port. At this time, the scraper 7 can be pulled by the connecting rod 8 to move in the shell 1, so that the scraper 7 scrapes the coal ash at the bottom of the shell 1 out of the shell 1 through the discharge port. At the same time, the discharge of the coal ash is assisted by the guide plate 5, so that the filtered coal ash that meets the standards can be cleaned out of the shell 1.

[0034] The working principle of this embodiment is as follows: when in use, the coal ash is added into the feed pipe 3, and the electric telescopic rod 20 is started to extend and retract at the same time. The electric telescopic rod 20 will drive the power arm 22 to reciprocate up and down, and the force arm 22 will drive the first guide plate 24 and the push plate 23 to move. When the push plate 23 moves downward, the rolling roller 26 will contact the second guide plate 28. At this time, the force arm 22 will squeeze and move downward, so that the push plate 23 will rotate upward and squeeze the spring 25, and at the same time, the rolling roller 26 will roll to crush the coal ash on the second guide plate 28. When the force arm 22 moves upward, the push plate 23 will reset and rotate downward under the action of gravity and the spring 25, and then the force arm 22 drives the rolling roller 26 on the push plate 23 to disengage from the second guide plate 28, so that the crushed coal ash falls onto the first filter plate 6 in the shell 1, and the fan 39 is started at the same time. The fan 39 will blow the inner diameter of the shell 1 less than 20 microns The coal ash is extracted, and the wind generated by the fan 39 during extraction will blow the cover plate 40 to rotate slightly, thereby opening the cover plate 40 to allow the coal ash with a diameter less than 20 microns to enter the collection shell. Since the diameter of the filter hole of the second filter plate 31 is less than 20 microns, the second filter plate 31 will block the coal ash in the collection shell and allow the air to circulate, thereby preventing the coal ash from entering the air and polluting the air. At the same time, the motor is started, the motor will drive the worm 14 to rotate, and the worm 14 will drive the rotating disk 15 to rotate. During the rotation, the rotating disk 15 will drive the connecting column 16 to move along the groove direction of the guide groove, so that the connecting frame 12 can reciprocate up and down, and the connecting frame 12 will drive the first filter plate 6 to move up and down through the support rod 10, so that the first filter plate 6 is shaken up and down to screen the coal ash, so that the coal ash with a diameter less than 20 microns can be absorbed, so that there is no need to screen the coal ash for the second time, thereby improving the screening efficiency of the coal ash.

[0035] The electrical components mentioned in this article are all connected to an external main controller and 220V mains electricity, and the main controller can be a conventional known device for controlling a computer or the like.

[0036] In the description of this article, it should be noted that relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprises" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0037] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A coal powder screening device for a thermal power plant, comprising a housing (1), characterized in that: The top of the shell (1) is fixedly connected to a feed pipe (3) which is in communication with the inside of the shell (1), and a crushing assembly for assisting the crushing of coal powder is arranged in the feed pipe (3). Two fixing blocks are fixedly connected to the inner walls on both sides of the shell (1), and a plurality of the fixing blocks are provided with sliding holes on the tops, and a support rod (10) is slidably connected in the sliding holes. The top of the support rod (10) is fixedly connected to a first filter plate (6) which is tilted downward, and the bottom of the first filter plate (6) is fixedly connected to a connecting frame (12), and a guide groove is arranged on one side of the connecting frame (12). A motor is fixedly connected to the outer wall of one side of the shell (1), and the motor One end of the output shaft passes through the housing (1) and is connected to a worm (14) via a coupling. One end of the worm (14) is fixedly connected to a rotating disk (15). One side of the rotating disk (15) is fixedly connected to a connecting column (16) that moves along the groove direction of the guide groove at an eccentric position. The bottom of the housing (1) is provided with an ash suction mechanism (2) for extracting coal powder less than 20 microns. One side of the housing (1) is provided with a discharge port for discharging coal powder on the first filter plate (6). A door panel (4) is rotatably connected in the discharge port. A scraping assembly for discharging filtered coal powder is provided in the housing (1).

2. A coal powder screening equipment for a thermal power plant according to claim 1, characterized in that: The crushing assembly comprises a support frame (21), the support frame (21) is fixedly connected to the top outer wall of the feed pipe (3), the top of the support frame (21) is fixedly connected to an electric telescopic rod (20), one end of the telescopic portion of the electric telescopic rod (20) passes through the feed pipe (3) and is fixedly connected to a force arm (22), the bottom of the force arm (22) is rotatably connected to a downwardly inclined push plate (23), one side of the push plate (23) is provided with a mounting groove, a rolling roller (26) is rotatably connected in the mounting groove, and a second downwardly inclined guide plate (28) is fixedly connected to the inner wall of one side of the feed pipe (3) at a position below the rolling roller (26).

3. A coal powder screening equipment for a thermal power plant according to claim 2, characterized in that: The outer side of the force arm (22) is fixedly connected to a downwardly inclined first guide plate (24) at a position above the push plate (23); two springs (25) are fixedly connected to the bottom of the first guide plate (24), and the springs (25) are fixed to the second guide plate (28); two material blocking rods (27) are fixedly connected to the upper surface of the second guide plate (28), and the rolling roller (26) is located between the two material blocking rods (27).

4. The coal powder screening equipment for a thermal power plant according to claim 1, characterized in that: The dust suction mechanism (2) comprises a collecting shell, the collecting shell is fixedly connected to the top outer wall of the shell (1), the top of the shell (1) is provided with two mounting holes at a position inside the collecting shell, a guide tube (35) is fixedly connected in the mounting holes, a fan (39) is fixedly connected in the guide tube (35), the top of the guide tube (35) is rotatably connected to two cover plates (40) for closing the guide tube (35), a mounting opening is provided on one side of the collecting shell, a mounting frame (29) is rotatably connected in the mounting opening, a second filter plate (31) is inserted in the mounting frame (29), two L-shaped rods (32) are fixedly connected at the bottom of one side of the mounting frame (29) at a position inside the collecting shell, guide rods (30) for resisting the L-shaped rods (32) are fixedly connected to the inner walls on both sides of the collecting shell, and a cleaning component for cleaning the second filter plate (31) is provided in the collecting shell.

5. A coal powder screening equipment for a thermal power plant according to claim 4, characterized in that: The cleaning assembly comprises a brush (36), the brush (36) is slidably connected between two guide rods (30), the bottom of the brush (36) is fixedly connected to a fixing frame (37), the collecting shell is fixedly connected to a guide frame (34), a sliding seat (33) is slidably connected inside the guide frame (34), and the sliding seat (33) is fixed to the fixing frame (37), a reciprocating screw (38) is rotatably connected inside the guide frame (34), the reciprocating screw (38) passes through the sliding seat (33) and is threadedly connected to the sliding seat (33), the bottom end of the reciprocating screw (38) passes through the housing (1) and is connected to a connecting shaft (9) through a coupling, and the connecting shaft (9) passes through the first filter plate (6), the bottom end of the connecting shaft (9) is key-connected to a worm gear (13), and the worm gear (13) is meshed with the worm (14).

6. The coal powder screening equipment for a thermal power plant according to claim 1, characterized in that: The scraper assembly comprises a scraper (7) which is slidably connected to the bottom inner wall of the shell (1); one side of the scraper (7) is fixedly connected to two connecting rods (8) for pulling the scraper (7) to move; one side of the shell (1) is provided with a discharge port at the bottom, and the scraper (7) is at the same height as the discharge port; a baffle (11) is inserted into the discharge port to close the discharge port.

7. A coal powder screening equipment for a thermal power plant according to claim 6, characterized in that: The bottom outer wall of the shell (1) is rotatably connected to a material guide plate (5), and one side outer wall of the shell (1) is provided with a blocking component for fixing the material guide plate (5), the door plate (4) and the baffle plate (11).

8. The coal powder screening equipment for a thermal power plant according to claim 7, characterized in that: The blocking assembly comprises two cams (18), both of which are rotatably connected to an outer wall of one side of the housing (1), and the two cams (18) respectively block the door panel (4) and the baffle plate (11). One side of the cam (18) located at the bottom is provided with two notches (17), and one side of the guide plate (5) is provided with a groove (19). The cam (18) extends into the groove (19), and the guide plate (5) extends into the notch (17), so that the cam (18) blocks the guide plate (5).

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