Coal powder screening equipment for thermal power plant

Abstract

The present application relates to the technical fields of coal powder screening, and discloses a coal powder screening device for thermal power plants, which comprises a shell, a feeding pipe connected to the inside of the shell and fixed to the top of the shell, a crushing assembly arranged in the feeding pipe to assist in crushing the coal powder, two fixed blocks fixed to the inner walls of the two sides of the shell, a sliding hole formed in the top of each fixed block, a support rod slidingly connected to the sliding hole, and a first filter plate fixed to the top end of the support rod and inclined downward. The present application can absorb the coal ash with a diameter less than 20 microns, so that the coal ash does not need to be screened again, the screening efficiency of the coal ash is improved, the coal ash can be crushed to reduce the volume of the coal ash, the use effect of the screening device is improved, and the coal ash can be prevented from accumulating in the filter holes of the second filter plate to block the filter holes and affect the air outlet of the fan, so that the normal use of the ash suction mechanism is ensured.

Description

TECHNICAL FIELD

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

[0002] Thermal power plants, referred to as thermal power plants, are factories that use combustible materials (such as coal powder) as fuel to generate electricity. When the fuel is burned, it heats water to produce steam, converting the chemical energy of the fuel into heat energy. The steam pressure drives the steam turbine to rotate, converting the heat energy into mechanical energy. Then the steam turbine drives the generator to rotate, converting the mechanical energy into electrical energy.

[0003] According to the search, the Chinese patent with the publication number CN219664402U discloses a coal powder screening device for thermal power plants. It does not require manual removal of the sieve bin to clean large coal blocks, can continuously feed materials to the feed inlet for screening, does not need to pause during the screening process, can save a lot of working time for the user, and increases the work efficiency. However, there are still the following defects: 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, coal powder smaller than 20 microns cannot be absorbed, and it still needs to be screened twice to meet the requirements, resulting in low screening efficiency. SUMMARY

[0004] Technical problems to be solved

[0005] In view of the defects of the prior art, the present application provides a coal powder screening device for thermal power plants, which mainly solves 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, coal powder smaller than 20 microns cannot be absorbed, and it still needs to be screened twice to meet the requirements, resulting in low screening efficiency.

[0006] Technical scheme

[0007] To achieve the above-mentioned purpose, the present application provides the following technical scheme:

[0008] The utility model provides a kind of coal powder screening equipment of thermal power plant, including shell, the top of the shell is fixedly connected with the feeding pipe being connected with shell interior, the feeding pipe is equipped with the crushing subassembly for assisting the auxiliary roll of coal powder, the both sides inner wall of the shell is fixedly connected with two fixed blocks, the top of multiple fixed blocks is equipped with sliding hole, sliding hole is slidably connected with support rod, the top of support rod is fixedly connected with the first filter plate of downward inclination, the bottom of the first filter plate is fixedly connected with connecting frame, the side of connecting frame is equipped with guide slot, the side outer wall of the shell is fixedly connected with motor, the one end of motor output shaft passes through shell and is connected with worm through coupling, the one end of worm is fixedly connected with rotating disc, the side of rotating disc is fixedly connected with connecting column in the position of eccentricity and moves along the slot of guide slot, the bottom of the shell is equipped with the dust extraction mechanism for extracting the coal powder less than twenty microns, the side of the shell is equipped with the discharge outlet for discharging the coal powder on the first filter plate, the discharge outlet is rotatably connected with door leaf, the shell is equipped with the scraping subassembly for discharging the coal powder after filtering.

[0009] The crushing subassembly includes support frame, the support frame is fixedly connected to the top outer wall of the feeding pipe, the top of the support frame is fixedly connected with electric telescopic rod, the one end of the telescopic part of electric telescopic rod is fixedly connected with force arm through the feeding pipe, the bottom of the force arm is rotatably connected with the downward inclined push plate, the side of the push plate is equipped with mounting slot, the mounting slot is rotatably connected with the roll, the side inner wall of the feeding pipe is fixedly connected with the downward inclined second guide plate below the roll.

[0010] The outside of the force arm is fixedly connected with the downward inclined first guide plate above the push plate, the bottom of the first guide plate is fixedly connected with two springs, and the springs are fixed to the push plate, the upper surface of the second guide plate is fixedly connected with two material blocking rods, and the roll is located between the two material blocking rods.

[0011] The dust extraction mechanism includes collection shell, the collection shell is fixedly connected to the top outer wall of the shell, the top of the shell is equipped with two mounting holes in the position of the collection shell, the mounting hole is fixedly connected with the draft tube, the draft tube is fixedly connected with the fan, the top of the draft tube is rotatably connected with two cover plates for closing the draft tube, the side of the collection shell is equipped with mounting opening, the mounting opening is rotatably connected with mounting frame, the second filter plate is inserted into the mounting frame, the side bottom of the mounting frame is fixedly connected with two L-shaped rods in the position of the collection shell, the both sides inner wall of the collection shell is fixedly connected with guide rod for resisting L-shaped rod, the collection shell is equipped with cleaning assembly for cleaning the second filter plate.

[0012] The cleaning assembly comprises a brush, the brush is slidingly connected between two guide rods, a fixed frame is fixedly connected to the bottom of the brush, a guide frame is fixedly connected to the collecting shell, a sliding seat is slidingly connected in the guide frame, the sliding seat is fixed with the fixed frame, a reciprocating screw rod is rotatably connected in the guide frame, the reciprocating screw rod penetrates through the sliding seat and is threadedly connected with the sliding seat, a connecting shaft is connected to the bottom end of the reciprocating screw rod through a shaft coupling, the connecting shaft penetrates through the first filter plate, a worm wheel is keyed connected to the bottom end of the connecting shaft, and the worm wheel is engaged with a worm.

[0013] On the basis of the foregoing scheme, the scraping assembly comprises a scraper, the scraper is slidingly connected to the inner wall of the bottom of the shell, two connecting rods for pulling the scraper to move are fixedly connected to one side of the scraper, a discharge port is formed in the position of the bottom of one side of the shell, and the scraper is flush with the discharge port, and a baffle for closing the discharge port is inserted into the discharge port.

[0014] As a further scheme of the present application, a guide plate is rotatably connected to the outer wall of the bottom of the shell, and a resisting assembly for fixing the guide plate, the door plate and the baffle is arranged on the outer wall of one side of the shell.

[0015] Further, the resisting assembly comprises two cams, the two cams are rotatably connected to the outer wall of one side of the shell, the two cams resist the door plate and the baffle respectively, two notches are formed in one side of the lower cam, a groove is formed in one side of the guide plate, the cam extends into the groove, and the guide plate extends into the notch, so that the cam resists the guide plate.

[0016] Advantages

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

[0018] 1. By arranging the ash suction mechanism, when filtering the coal ash, the ash suction mechanism can suck and extract the coal ash with a diameter less than 20 microns, so that the coal ash with a diameter less than 20 microns can be absorbed, and secondary screening of the coal ash is not needed, thereby improving the screening efficiency of the coal ash.

[0019] 2. By arranging the crushing assembly, when the coal ash is fed through the feeding pipe, the crushing assembly can crush the coal ash, thereby assisting in crushing the coal ash and reducing the volume of the coal ash, and improving the use effect of the screening device.

[0020] 3. By arranging the cleaning assembly, the second filter plate can be cleaned using the cleaning assembly, so that the coal ash accumulated in the filter holes of the second filter plate can be avoided to block the filter holes and affect the air outlet of the fan, and the normal use of the ash suction mechanism is ensured. BRIEF DESCRIPTION OF DRAWINGS

[0021] Figure 1 A three-dimensional structural schematic view of a coal powder screening device for a thermal power plant is provided in the present application;

[0022] Figure 2 An internal structural schematic view of a coal powder screening device for a thermal power plant is provided in the present application;

[0023] Figure 3 An enlarged structural schematic view of part A of a coal powder screening device for a thermal power plant is provided in the present application;

[0024] Figure 4 An enlarged structural schematic view of part B of a coal powder screening device for a thermal power plant is provided in the present application;

[0025] Figure 5 A sectional structural schematic view of a feed pipe of a coal powder screening device for a thermal power plant is provided in the present application;

[0026] Figure 6 A sectional structural schematic view of an ash suction mechanism of a coal powder screening device for a thermal power plant is provided in the present application;

[0027] Figure 7 A sectional structural schematic view of a flow guide pipe of a coal powder screening device for a thermal power plant is provided in the present application.

[0028] In the figure: 1, housing; 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 disc; 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, sliding seat; 34, guide frame; 35, flow guide pipe; 36, brush; 37, fixing frame; 38, reciprocating screw rod; 39, fan; 40, cover plate. DETAILED DESCRIPTION

[0029] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, any person skilled in the art can make further embodiments without making any creative effort, which all belong to the scope of protection of the present application.

[0030] REFERENCE Figures 1-7The utility model provides a coal powder screening equipment of thermal power plant, including the casing 1, the top of casing 1 is fixed with the feeding pipe 3 with the inside communication of casing 1 by bolt, is equipped with the rubbing assembly of the auxiliary roll pressure to coal powder in feeding pipe 3, the both sides inner wall of casing 1 are welded with two fixed blocks, the top of multiple fixed blocks all are equipped with slide hole, and the slide hole is slidably connected with support rod 10, and the top of support rod 10 is fixed with the first filter plate 6 of downward inclination through bolt, and the filter hole diameter of first filter plate 6 is greater than twenty microns less than fifty microns, and the bottom of first filter plate 6 is fixed with the connecting frame 12 through bolt, and the connecting frame 12 is equipped with the guide slot on one side, and the outer wall of one side of casing 1 is fixed with motor through bolt, and one end of motor output shaft passes through the casing 1 and is connected with worm 14 through coupling, and one end of worm 14 is fixed with rotary disc 15 through bolt, and the connecting column 16 of moving along the groove direction is welded to the position of eccentricity on one side of rotary disc 15, and the bottom of casing 1 is equipped with the dust extraction mechanism 2 for extracting the coal powder less than twenty microns, add the fly ash to feeding pipe 3, and the fly ash is rolled by rubbing assembly, and the fly ash after rolling will enter into the casing 1, now the fly ash less than twenty microns is extracted through dust extraction mechanism 2, and simultaneously starting motor, and motor can drive worm 14 to rotate, and worm 14 drives rotary disc 15 to rotate, and rotary disc 15 will drive connecting column 16 to move along the groove direction in the process of rotating, to make the up-and-down reciprocating movement of connecting frame 12, and connecting frame 12 will drive first filter plate 6 to move up and down through support rod 10, and make first filter plate 6 to shake up and down and screen the fly ash, so that the fly ash less than twenty microns can be absorbed, so that the fly ash does not need to be screened secondly, improve the screening efficiency of fly ash, and the discharge port for the coal powder on first filter plate 6 is equipped on one side of casing 1 and is used to discharge, and the door plate 4 is rotatably connected in discharge port, and opens door plate 4, now the fly ash greater than fifty microns on first filter plate 6 can be cleaned and collected, and the scraping assembly for discharging the fly ash after filtering is equipped in casing 1.

[0031] The application, the crushing assembly comprises a support frame 21 fixed on the top outer wall of the feed pipe 3 by bolts, the top of the support frame 21 is fixed with an electric telescopic rod 20 by bolts, one end of the telescopic part of the electric telescopic rod 20 is fixed with a force arm 22 by bolts through the feed pipe 3, the bottom of the force arm 22 is rotatably connected with a downward inclined push plate 23, a mounting groove is formed on one side of the push plate 23, a crushing roller 26 is rotatably connected in the mounting groove, a downward inclined second guide plate 28 is fixed on the inner wall of one side of the feed pipe 3 below the crushing roller 26 by bolts, a downward inclined first guide plate 24 is fixed on the outer side of the force arm 22 above the push plate 23 by bolts, two springs 25 are welded on the bottom of the first guide plate 24 and fixed with the push plate 23, two material blocking rods 27 are welded on the upper surface of the second guide plate 28, and the crushing roller 26 is located between the two material blocking rods 27, the coal ash is added into the feed pipe 3, and the electric telescopic rod 20 is started to extend and contract, the electric telescopic rod 20 drives the force arm 22 to reciprocate up and down, the force arm 22 drives the first guide plate 24 and the push plate 23 to move, the push plate 23 contacts the second guide plate 28 when moving downward, at this time, the force arm 22 is extruded downward, so that the push plate 23 rotates upward and extrudes the spring 25, and the crushing roller 26 rolls to crush the coal ash on the second guide plate 28, when the force arm 22 moves upward, the push plate 23 rotates downward under the action of gravity and the spring 25, then the force arm 22 drives the crushing 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 shell 1, and under the action of the first guide plate 24, the coal ash can be guided to fall onto the second guide plate 28, so that the coal ash is prevented from falling onto the push plate 23;

[0032] Especially, the dust suction mechanism 2 comprises a collecting shell which is fixed on the top outer wall of the shell body 1 by bolts, two mounting holes are arranged on the position of the top of the shell body 1 in the collecting shell, a flow guide pipe 35 is fixed in the mounting holes by bolts, a fan 39 is fixed in the flow guide pipe 35 by bolts, two cover plates 40 which close the flow guide pipe 35 are rotatably connected on the top of the flow guide pipe 35, an installation opening is arranged on one side of the collecting shell, an installation frame 29 is rotatably connected in the installation opening, a lock is arranged on the top of the collecting shell to fix the installation frame 29, a second filter plate 31 is inserted in the installation frame 29, the diameter of the filter holes of the second filter plate 31 is less than 20 microns, two L-shaped rods 32 are welded on the position of the bottom of one side of the installation frame 29 in the collecting shell, guide rods 30 which resist the L-shaped rods 32 are fixed on the inner walls of the two sides of the collecting shell by bolts, a cleaning assembly which cleans the second filter plate 31 is arranged in the collecting shell, the fan 39 is started, the fan 39 can suck the coal dust with a diameter less than 20 microns in the shell body 1, at the same time, the wind generated when the fan 39 sucks can blow the cover plates 40 to slightly rotate, so as to open the cover plates 40 and make the coal dust with a diameter less than 20 microns enter the collecting shell, because the diameter of the filter holes of the second filter plate 31 is less than 20 microns, the second filter plate 31 can resist the coal dust in the collecting shell and make the air flow, so as to avoid the coal dust from entering the air to pollute the air, the cleaning assembly comprises a brush 36 which is slidably connected between the two guide rods 30, a fixing frame 37 is fixed on the bottom of the brush 36 by bolts, a guide frame 34 is fixed in the collecting shell by bolts, a sliding seat 33 is slidably connected in the guide frame 34, the sliding seat 33 is fixed with the fixing frame 37, a reciprocating screw rod 38 is rotatably connected in the guide frame 34, the reciprocating screw rod 38 penetrates through the sliding seat 33 and is threadedly connected with the sliding seat 33, the bottom end of the reciprocating screw rod 38 is connected with a connecting shaft 9 through a shaft coupling, the connecting shaft 9 penetrates through the first filter plate 6, the bottom end of the connecting shaft 9 is keyed connected with a worm wheel 13, the worm wheel 13 is engaged with a worm gear 14, the worm gear 14 drives the worm wheel 13 to rotate in the process of rotating, the worm wheel 13 drives the connecting shaft 9 to rotate, the connecting shaft 9 drives the reciprocating screw rod 38 to rotate, the reciprocating screw rod 38 drives the sliding seat 33 to reciprocatingly move up and down along the guide frame 34 through the thread engagement between the reciprocating screw rod 38 and 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 reciprocatingly move up and down along the guide rod 30, the brush 36 cleans the second filter plate 31, so as to avoid the coal dust from being accumulated in the filter holes of the second filter plate 31 to block the filter holes and affect the air outlet of the fan 39, and the normal use of the dust suction mechanism 2 is ensured.

[0033] The scraping assembly comprises a scraper 7 slidingly connected to the inner wall of the bottom of the shell 1, two connecting rods 8 for pulling the scraper 7 to move are fixed on one side of the scraper 7 by bolts, a discharge port is formed in the position of the bottom of one side of the shell 1, and the scraper 7 is level with the discharge port, a baffle 11 for closing the discharge port is inserted into the discharge port, a guide plate 5 is rotatably connected to the outer wall of the bottom of the shell 1, a resisting assembly for fixing the guide plate 5, the door plate 4 and the baffle 11 is arranged on the outer wall of one side of the shell 1, the resisting assembly comprises 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 notches 17 are formed in one side of the lower cam 18, a recess 19 is formed in one side of the guide plate 5, the cam 18 extends into the recess 19, and the guide plate 5 extends into the notch 17, so that the cam 18 resists the guide plate 5, the cam 18 no longer resists the door plate 4, the guide plate 5 and the baffle 11 by rotating the cam 18, at this time, the door plate 4 can be opened, and the guide plate 5 is rotated downward to be in an inclined state, then the baffle 11 is taken out of the discharge port, at this time, the scraper 7 can be pulled in the shell 1 by the connecting rod 8 to move, 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, and the discharge of the coal ash is assisted to guide under the action of the guide plate 5, so that the filtered coal ash meeting the standard can be cleaned out of the shell 1.

[0034] The working principle of the embodiment is as follows: when in use, the coal ash is added into the feeding pipe 3, and the electric telescopic rod 20 is started to extend and contract, so that the electric telescopic rod 20 drives the force arm 22 to move up and down in a reciprocating manner, the force arm 22 drives the first guide plate 24 and the push plate 23 to move, the push plate 23 is in contact with the second guide plate 28 when moving downward, at this time, the force arm 22 is extruded downward, so that the push plate 23 rotates upward and extrudes the spring 25, and the rolling mill 26 rolls to crush the coal ash on the second guide plate 28, when the force arm 22 moves upward, the push plate 23 rotates downward under the action of gravity and the spring 25, and then the force arm 22 drives the rolling mill 26 on the push plate 23 to be separated from the second guide plate 28, so that the crushed coal ash falls onto the first filter plate 6 in the shell 1, the fan 39 is started, the fan 39 extracts the coal ash with a diameter less than 20 microns in the shell 1, and the fan 39 blows the cover plate 40 to rotate slightly when extracting, so as to open the cover plate 40 and make the coal ash with a diameter less than 20 microns enter the collecting shell, and the second filter plate 31 blocks the coal ash in the collecting shell and makes the air flow, so as to prevent the coal ash from entering the air and polluting the air, and the motor is started, the motor drives the worm 14 to rotate, the worm 14 drives the rotating disc 15 to rotate, and the rotating disc 15 drives the connecting column 16 to move along the guide groove in the process of rotating, so as to make the connecting frame 12 move up and down in a reciprocating manner, the connecting frame 12 drives the first filter plate 6 to move up and down through the support rod 10, so as to make the first filter plate 6 shake up and down to screen the coal ash, so as to absorb the coal ash with a diameter less than 20 microns, so that the coal ash does not need to be screened twice, and the screening efficiency of the coal ash is improved.

[0035] The electrical components in the text are all connected with the main controller and 220V mains electricity, and the main controller can be a conventional known device such as a computer.

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

[0037] While embodiments of the application have been shown and described, it is to be understood that the embodiments described are merely exemplary of the principles and application of the present application. Numerous modifications and adaptions can be effected without departing from the spirit and scope of the present application, which is not limited to the exact construction and arrangement described. It is intended, therefore, to cover all modifications and adaptions that fall within the scope of the claims and their equivalents.

Claims

1. A coal dust screening device for a thermal power plant, comprising a housing (1), characterized in that, The top of the shell (1) is fixedly connected with a feeding pipe (3) in communication with the inside of the shell (1), the feeding pipe (3) is provided with a crushing assembly for assisting the crushing of the coal powder, both side inner walls of the shell (1) are fixedly connected with two fixed blocks, the top of each of the fixed blocks is provided with a sliding hole, a support rod (10) is slidably connected in the sliding hole, the top end of the support rod (10) is fixedly connected with a first filter plate (6) inclined downward, the bottom of the first filter plate (6) is fixedly connected with a connecting frame (12), the connecting frame (12) is provided with a guide groove on one side, one side outer wall of the shell (1) is fixedly connected with a motor, one end of the motor output shaft penetrates through the shell (1) and is connected with a worm (14) through a shaft coupling, one end of the worm (14) is fixedly connected with a rotating disc (15), the connecting column (16) moving along the groove of the guide groove is fixedly connected on one side of the rotating disc (15) at an eccentric position, the bottom of the shell (1) is provided with an ash suction mechanism (2) for sucking the coal powder less than 20 microns, one side of the shell (1) is provided with a discharge port for discharging the coal powder on the first filter plate (6), a door plate (4) is rotatably connected in the discharge port, the shell (1) is provided with a scraping assembly for discharging the filtered coal powder; The crushing assembly comprises a support frame (21) fixedly connected to the top outer wall of the feeding pipe (3), an electric telescopic rod (20) fixedly connected to the top of the support frame (21), one end of the telescopic part of the electric telescopic rod (20) penetrating through the feeding pipe (3) is fixedly connected with a force arm (22), the bottom of the force arm (22) is rotatably connected with a push plate (23) inclined downward, the side of the push plate (23) is provided with a mounting groove, and a crushing roller (26) is rotatably connected in the mounting groove, the side inner wall of the feeding pipe (3) is fixedly connected with a second guide plate (28) inclined downward below the crushing roller (26); The outside of the force arm (22) is fixedly connected with a first guide plate (24) inclined downward above the push plate (23), the bottom of the first guide plate (24) is fixedly connected with two springs (25), and the springs (25) are fixed to the push plate (23), the upper surface of the second guide plate (28) is fixedly connected with two material blocking rods (27), and the crushing roller (26) is located between the two material blocking rods (27); The dust collecting mechanism (2) comprises a collecting shell, the collecting shell is fixedly connected to the top outer wall of the shell (1), two mounting holes are formed in the position of the top of the shell (1) in the collecting shell, a flow guide pipe (35) is fixedly connected in the mounting hole, a fan (39) is fixedly connected in the flow guide pipe (35), two cover plates (40) for closing the flow guide pipe (35) are rotatably connected to the top of the flow guide pipe (35), an installation opening is formed in one side of the collecting shell, an installation frame (29) is rotatably connected in the installation opening, a second filter plate (31) is inserted in the installation frame (29), two L-shaped rods (32) are fixedly connected to the position of the bottom of one side of the installation frame (29) in the collecting shell, guide rods (30) for resisting the L-shaped rods (32) are fixedly connected to the inner walls of the two sides of the collecting shell, and a cleaning assembly for cleaning the second filter plate (31) is arranged in the collecting shell. The cleaning assembly comprises a brush (36), the brush (36) is slidably connected between the two guide rods (30), a fixing frame (37) is fixedly connected to the bottom of the brush (36), a guide frame (34) is fixedly connected to the collecting shell, a sliding seat (33) is slidably connected in the guide frame (34), the sliding seat (33) is fixed with the fixing frame (37), a reciprocating screw rod (38) is rotatably connected in the guide frame (34), the reciprocating screw rod (38) penetrates through the sliding seat (33) and is threadedly connected with the sliding seat (33), the bottom end of the reciprocating screw rod (38) is connected with a connecting shaft (9) through a shaft coupling, the connecting shaft (9) penetrates through the first filter plate (6), the bottom end of the connecting shaft (9) is keyed connected with a worm wheel (13), and the worm wheel (13) is engaged with a worm (14).

2. A coal powder screening apparatus for a thermal power plant according to claim 1, characterized in that, The scraping assembly comprises a scraper (7), the scraper (7) is slidably connected to the bottom inner wall of the shell (1), two connecting rods (8) for pulling the scraper (7) to move are fixedly connected to one side of the scraper (7), a discharge port is formed in the position of one side of the bottom of the shell (1), the scraper (7) is in the same height with the discharge port, and a baffle (11) for closing the discharge port is inserted in the discharge port.

3. A coal dust screening device for a thermal power plant according to claim 2, characterized in that, A guide plate (5) is rotatably connected to the bottom outer wall of the shell (1), and a resisting assembly for fixing the guide plate (5), the door plate (4) and the baffle (11) is arranged on one side outer wall of the shell (1).

4. A coal powder screening apparatus for a thermal power plant according to claim 3, characterized in that, The resisting assembly comprises two cams (18), the two cams (18) are rotatably connected to one side outer wall of the shell (1), the two cams (18) resist the door plate (4) and the baffle (11) respectively, two notches (17) are formed in one side of the lower cam (18), a recess (19) is formed in one side of the guide plate (5), the cam (18) extends into the recess (19), and the guide plate (5) extends into the notch (17), so that the cam (18) resists the guide plate (5).

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