Regulating mechanism for fineness of pulverized coal at outlet of coal mill of power plant

Abstract

The invention relates to the technical field of coal mill equipment, and discloses a power plant coal mill outlet pulverized coal fineness adjusting mechanism which comprises a shell, the top face of the shell is rotationally connected with a discharging hopper, the bottom end of the discharging hopper communicates with and is fixedly provided with a coarse material returning hopper, a rotor air cage is fixed to the outer wall of the coarse material returning hopper, and a stator air cage is arranged in the shell; adjusting assemblies are arranged on the top surfaces of the rotor wind cage and the stator wind cage; and each adjusting assembly comprises a first adjusting ring and a second adjusting ring which are respectively arranged on the top surfaces of the rotor wind cage and the stator wind cage. In the process that a first adjusting ring and a second adjusting ring are driven to drive a first fixing rod and a second fixing rod to press downwards, a spiral rod slides in the first fixing rod and the second fixing rod, so that a first fan blade and a second fan blade are driven to rotate, and the opening degrees of the first fan blade and the second fan blade can be adjusted correspondingly; the aerodynamic effect between the rotor wind cage and the stator wind cage is more effectively controlled, and the fineness of coal is more accurately controlled.

Description

Technical Field

[0001] The invention relates to the technical field of coal mill equipment, and in particular to a coal powder fineness adjustment mechanism at an outlet of a coal mill in a power plant. Background Art

[0002] The technology of the static separator of the coal mill is very mature. The fineness of the coal powder is achieved by rotating the shutters driven by the handle on the top of the separator. Each blade of the shutters of the coal powder fineness adjustment device corresponds to a transmission shaft. During operation, all transmission shafts rotate synchronously, and the blade opening is adjusted to achieve the fineness adjustment of the coal powder output.

[0003] An existing adjustable coal mill separator (Announcement No.: CN114811645A) has at least the following disadvantages: the device adjusts the fineness of the coal powder by manually adjusting the opening of the stator guide vanes, but since the coal mill is too high and the adjustment device is on the top surface of the coal mill, manual adjustment is inconvenient and the efficiency of manually adjusting the opening of the blades is low. At the same time, the device can only adjust the opening of the stator guide vanes, but cannot adjust the opening of the rotating guide vanes in rotation, so that the fineness adjustment accuracy of the device still has room for improvement, and the present invention is proposed for this purpose. Summary of the invention

[0004] The purpose of the present invention is to solve the shortcomings of the prior art and to propose a coal powder fineness adjustment mechanism for a power plant coal mill outlet.

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

[0006] A mechanism for adjusting the fineness of coal powder at the outlet of a coal mill in a power plant comprises an outer shell, the top surface of the outer shell is rotatably connected to a lower hopper, the bottom end of the lower hopper is connected to and fixed with a coarse material return hopper, the outer wall of the coarse material return hopper is fixed with a rotor wind cage, a stator wind cage is arranged inside the outer shell, the top surfaces of the rotor wind cage and the stator wind cage are both provided with adjustment components, the adjustment components comprise a first adjustment ring and a second adjustment ring respectively arranged on the top surfaces of the rotor wind cage and the stator wind cage, a plurality of first fixing rods and a plurality of second fixing rods are respectively fixed to the bottom surfaces of the first adjustment ring and the second adjustment ring, the first fixing rod penetrates and is slidably inserted into the top surface of the outer shell.

[0007] As a further solution of the present invention, a plurality of spiral rods are provided on the top surfaces of the rotor wind cage and the stator wind cage, the spiral rods on the rotor wind cage and the stator wind cage are respectively slidably inserted into the outer walls of the first fixed rod and the second fixed rod, the internal slots of the first fixed rod and the second fixed rod are adapted to the spiral outer walls of the spiral rods, the rotor wind cage includes two first fixed rings spaced apart from each other, a first fan blade is rotatably connected between the two first fixed rings, the stator wind cage includes two second fixed rings spaced apart from each other, a second fan blade is rotatably connected between the two second fixed rings, and a plurality of spiral rods are respectively fixed to the top ends of the first fan blade and the second fan blade.

[0008] As a further solution of the present invention, an L-shaped rod is fixed to the inner wall of the first adjustment ring near the front and rear sides, and the L-shaped rod penetrates the outer wall of the shell and is slidably inserted and extends to the top of the second adjustment ring.

[0009] As a further solution of the present invention, a directional wheel is fixed to the bottom end of the L-shaped rod, and the roller of the directional wheel abuts against the top surface of the second adjustment ring.

[0010] As a further solution of the present invention, connecting plates are fixed on the left and right sides of the inner wall of the first adjustment ring, mounting frames are fixed on the top surface of the outer shell near the left and right sides, a hydraulic rod is fixed on the top surface of the mounting frame, one end of the hydraulic rod telescopic rod passes through the top surface of the mounting frame and is fixed to the top surface of the connecting plate, and a support plate is fixed on the front side of the outer shell.

[0011] As a further solution of the present invention, a driving motor is fixed on the top surface of the support plate, a gear is fixed to one end of the telescopic rod of the driving motor, a gear ring is fixed to the outer wall of the lower hopper, and the gear and the gear ring are driven by toothed belt meshing.

[0012] As a further solution of the present invention, linkage rings are provided below the first adjustment ring and the second adjustment ring, a plurality of first fixing rods and a plurality of second fixing rods are respectively penetrated and fixed to the top surfaces of the two linkage rings, a plurality of spring telescopic rods are fixed to the top surfaces of the rotor wind cage and the stator wind cage, and the spring telescopic rods on the rotor wind cage and the stator wind cage are respectively fixed to the bottom surfaces of the two linkage rings.

[0013] As a further solution of the present invention, a blocking cover is fixed to the top surfaces of the first adjustment ring and the second adjustment ring, and a plurality of first fixing rods and a plurality of second fixing rods penetrate through the top surfaces of the blocking cover and are slidably inserted.

[0014] As a further solution of the present invention, mounting plates are fixed to the outer wall of the stator wind cage near the four sides of front, back, left and right. The top surface of the mounting plate is provided with a mounting hole. Bolts are slidably inserted into the mounting hole, and the bolts are threadedly connected to the inner top surface of the shell.

[0015] As a further solution of the present invention, two discharge pipes are connected and fixed on the top surface of the shell near the left and right sides.

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

[0017] By setting the first adjusting ring and the second adjusting ring, when the first adjusting ring and the second adjusting ring are driven to drive the first fixed rod and the second fixed rod to press down, the spiral rod will slide inside the first fixed rod and the second fixed rod, thereby driving the first fan blade and the second fan blade to rotate, so that the opening of the first fan blade and the second fan blade can be adjusted respectively, the aerodynamic effect between the rotor wind cage and the stator wind cage can be more effectively controlled, and the fineness of the coal can be controlled more accurately.

[0018] By using a hydraulic rod, the first adjustment ring and the second adjustment ring can be driven to move at the same time, so that the opening of the first fan blade and the second fan blade can be adjusted at the same time without manual operation, which reduces manpower expenditure and ensures adjustment efficiency and accuracy.

[0019] By using the roller of the directional wheel to abut against the top surface of the second adjustment ring, it is ensured that the rotating rotor wind cage will not be affected during the process of driving the second adjustment ring to adjust the opening of the second fan blade, thereby ensuring the normal operation of the device. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 A schematic diagram of the three-dimensional structure of a coal powder fineness adjustment mechanism at the outlet of a power plant coal mill proposed by the present invention;

[0021] Figure 2 This is a three-dimensional split structural schematic diagram of a coal powder fineness adjustment mechanism at a power plant coal mill outlet proposed by the present invention;

[0022] Figure 3 This is a schematic diagram of the three-dimensional structure of the outer shell of a coal powder fineness adjustment mechanism at an outlet of a power plant coal mill proposed by the present invention;

[0023] Figure 4 This is a schematic diagram of the three-dimensional structure of the first adjustment ring and the second adjustment ring of the coal powder fineness adjustment mechanism at the outlet of a power plant coal mill proposed by the present invention.

[0024] Figure 5 This is a schematic diagram of the three-dimensional structure of the first and second blades of a coal powder fineness adjustment mechanism at an outlet of a power plant coal mill proposed by the present invention;

[0025] Figure 6 for Figure 5 A is an enlarged schematic diagram of the local three-dimensional structure;

[0026] Figure 7This is a schematic diagram of the three-dimensional structure of the second fixed ring of a coal powder fineness adjustment mechanism at an outlet of a power plant coal mill proposed by the present invention.

[0027] In the figure: 1. casing; 101. lower hopper; 102. rotor wind cage; 1021. first fixing ring; 1022. first blade; 103. stator wind cage; 1031. second fixing ring; 1032. second blade; 104. coarse material return hopper; 2. first adjusting ring; 201. second adjusting ring; 202. first fixing rod; 203. second fixing rod; 204. spiral rod; 205. L-shaped rod; 206. directional wheel; 3. mounting frame; 301. hydraulic rod; 302. driving motor; 303. gear; 304. gear ring; 305. connecting plate; 306. supporting plate; 4. linkage ring; 401. spring telescopic rod; 5. blocking cover; 6. mounting plate; 601. mounting hole; 602. bolt; 7. discharge pipe. DETAILED DESCRIPTION

[0028] In order to make the technical means, creative features, objectives and effects achieved by the present invention easy to understand, the present invention is further explained below in conjunction with specific implementation methods.

[0029] In the description of the present invention, it should be noted that the terms "upper", "lower", "inner", "outer", "front end", "rear end", "two ends", "one end", "the other end" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance.

[0030] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "provided with", "connected", etc. should be understood in a broad sense. For example, "connected" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0031] like Figure 1-Figure 5As shown, a coal powder fineness adjustment mechanism at the outlet of a coal mill in a power plant comprises a shell 1, the top surface of the shell 1 is rotatably connected with a lower hopper 101, the bottom end of the lower hopper 101 is connected to and fixed with a coarse material return hopper 104, the outer wall of the coarse material return hopper 104 is fixed with a rotor wind cage 102, a stator wind cage 103 is arranged inside the shell 1, the top surfaces of the rotor wind cage 102 and the stator wind cage 103 are both provided with adjustment components, the adjustment components comprise a first adjustment ring 2 and a second adjustment ring 201 which are respectively arranged on the top surfaces of the rotor wind cage 102 and the stator wind cage 103, a plurality of first fixing rods 202 and a plurality of second fixing rods 203 are respectively fixed to the bottom surfaces of the first adjustment ring 2 and the second adjustment ring 201, the first fixing rod 202 penetrates and is slidably inserted with the top surface of the shell 1.

[0032] like Figure 2-Figure 5 As shown, in this embodiment, the top surfaces of the rotor wind cage 102 and the stator wind cage 103 are both provided with a plurality of spiral rods 204, and the spiral rods 204 on the rotor wind cage 102 and the stator wind cage 103 are respectively slidably inserted with the outer walls of the first fixed rod 202 and the second fixed rod 203, and the internal slots of the first fixed rod 202 and the second fixed rod 203 are adapted to the spiral outer walls of the spiral rod 204, the rotor wind cage 102 includes two first fixed rings 1021 spaced apart from each other, and the first fan blades 1022 are rotatably connected between the two first fixed rings 1021, and the stator wind cage 103 includes two second fixed rings 1031 spaced apart from each other, and the second fan blades 1032 are rotatably connected between the two second fixed rings 1031, and the plurality of spiral rods 204 are respectively inserted with the first fixed rings 1021 and the second fixed rings 1031. The top ends of the blades 1022 and the second blades 1032 are fixed, and the first fixing rod 202 and the second fixing rod 203 are driven to move downward by driving the first adjusting ring 2 and the second adjusting ring 201. Under the action of the sliding insertion of the spiral rod 204 on the rotor wind cage 102 and the stator wind cage 103 with the outer walls of the first fixing rod 202 and the second fixing rod 203 respectively, the spiral rod 204 slides along the internal spiral slots of the first fixing rod 202 and the second fixing rod 203, thereby driving the spiral rod 204, the first blade 1022 and the second blade 1032 to rotate synchronously, thereby adjusting the opening of the first blade 1022 and the second blade 1032, effectively controlling the aerodynamic effect between the rotor wind cage 102 and the stator wind cage 103, and more accurately controlling the fineness of the coal.

[0033] like Figure 2-Figure 6As shown, in this embodiment, an L-shaped rod 205 is fixed to the inner wall of the first adjustment ring 2 near the front and rear sides, and the L-shaped rod 205 penetrates the outer wall of the shell 1 and is slidably inserted and extends to the top of the second adjustment ring 201. It is connected to the first adjustment ring 2 through the L-shaped rod 205, so that when the first adjustment ring 2 is driven downward, the L-shaped rod 205 is also pressed down and presses down the second adjustment ring 201, thereby adjusting the opening of the first fan blade 1022 and the second fan blade 1032 at the same time.

[0034] like Figure 3-Figure 7 As shown, in this embodiment, a directional wheel 206 is fixed to the bottom end of the L-shaped rod 205, and the roller of the directional wheel 206 abuts against the top surface of the second adjustment ring 201. By arranging the directional wheel 206 to replace the bottom end of the L-shaped rod 205 to press the top surface of the second adjustment ring 201, less friction is achieved, thereby ensuring that in the process of driving the second adjustment ring 201 to adjust the opening of the second fan blade 1032, the rotating rotor wind cage 102 is not affected, thereby ensuring the normal operation of the device.

[0035] like Figure 4-Figure 7 As shown, in this embodiment, connecting plates 305 are fixed on the left and right sides of the inner wall of the first adjusting ring 2, and mounting frames 3 are fixed on the top surface of the outer shell 1 near the left and right sides. A hydraulic rod 301 is fixed on the top surface of the mounting frame 3. One end of the telescopic rod of the hydraulic rod 301 passes through the top surface of the mounting frame 3 and is fixed to the top surface of the connecting plate 305. A support plate 306 is fixed on the front side of the outer shell 1. A driving motor 302 is fixed on the top surface of the support plate 306. A gear 303 is fixed on one end of the telescopic rod of the driving motor 302. A gear ring 304 is fixed to the outer wall of the lower hopper 101, and the gear 303 and the gear ring 304 are meshed through a toothed belt for transmission. The hydraulic rod 301 is started to drive the connecting plate 305 to be pressed down, thereby driving the first adjustment ring 2 to be pressed down, thereby adjusting the opening of the first blade 1022 and the second blade 1032. The drive motor 302 is started to drive the gear 303 to rotate. Under the meshing transmission of the gear 303 and the gear ring 304 through the toothed belt, the lower hopper 101 and the stator wind cage 103 and the coal powder are separated.

[0036] like Figure 4-Figure 7As shown, in this embodiment, a linkage ring 4 is provided below the first adjusting ring 2 and the second adjusting ring 201, and a plurality of first fixing rods 202 and a plurality of second fixing rods 203 are respectively fixed through the top surfaces of the two linkage rings 4, and a plurality of spring telescopic rods 401 are fixed on the top surfaces of the rotor wind cage 102 and the stator wind cage 103, and the spring telescopic rods 401 on the rotor wind cage 102 and the stator wind cage 103 are respectively fixed to the bottom surfaces of the two linkage rings 4. By providing the spring telescopic rods 401, when the hydraulic rod 301 pulls up the connecting plate 305 and the first adjusting ring 2, the crimping of the directional wheel 206 on the second adjusting ring 201 disappears, and the spring telescopic rods 401 quickly lift up the linkage ring 4 and the second fixing rods 203, so that the second adjusting ring 201 is close to the directional wheel 206, ensuring that the lifting heights of the first adjusting ring 2 and the second adjusting ring 201 are equal, and ensuring that the opening degrees of the first blade 1022 and the second blade 1032 are consistent.

[0037] like Figure 4-Figure 7 As shown, in this embodiment, a baffle 5 is fixed to the top surface of the first adjustment ring 2 and the second adjustment ring 201, and a plurality of first fixed rods 202 and a plurality of second fixed rods 203 are penetrated through the top surface of the baffle 5 and slidably inserted. The baffle 5 can protect the spiral rod 204 to prevent coal powder from clogging the spiral rod 204 and affecting the opening adjustment of the first fan blade 1022 and the second fan blade 1032.

[0038] like Figure 4-Figure 7 As shown, in this embodiment, the outer wall of the stator air cage 103 is fixed with mounting plates 6 near the four sides of the front, back, left and right. The top surface of the mounting plate 6 is provided with a mounting hole 601. A bolt 602 is slidably inserted into the inside of the mounting hole 601. The bolt 602 is threadedly connected to the inner top surface of the shell 1. By inserting the bolt 602 into the inside of the mounting hole 601 and threading it with the inner top surface of the shell 1, the stator air cage 103 can be detachably installed inside the shell 1, so that it is convenient for disassembly and maintenance at any time.

[0039] like Figure 4-Figure 7 As shown, in this embodiment, two discharge pipes 7 are connected and fixed to the top surface of the shell 1 near the left and right sides, and the coal powder that meets the fineness standard can be discharged through the discharge pipes 7.

[0040] From the above description, it can be seen that the above embodiment of the present invention achieves the following technical effects: in use, by starting the hydraulic rod 301 to drive the connecting plate 305 to press down, the first adjusting ring 2 is driven to press down, and the L-shaped rod 205 is connected to the first adjusting ring 2, so that when the first adjusting ring 2 is driven to press down, the L-shaped rod 205 is also linked to press down and press the second adjusting ring 201, so that the directional wheel 206 presses the top surface of the second adjusting ring 201, so that the first adjusting ring 2 and the second adjusting ring 201 synchronously drive the first fixing rod 202 and the second fixing rod 203 to move downward, Under the action of the spiral rod 204 on the rotor wind cage 102 and the stator wind cage 103 slidingly inserting with the outer wall of the first fixed rod 202 and the second fixed rod 203, the spiral rod 204 slides along the inner spiral slot of the first fixed rod 202 and the second fixed rod 203. In this process, the linkage ring 4 presses and compresses the spring telescopic rod 401, thereby driving the spiral rod 204, the first fan blade 1022 and the second fan blade 1032 to rotate synchronously, thereby adjusting the opening of the first fan blade 1022 and the second fan blade 1032, and effectively controlling the rotor wind cage 102 and the stator wind cage 103. The aerodynamic effect between the two can more accurately control the fineness of the coal. By setting the spring telescopic rod 401, when the hydraulic rod 301 pulls up the connecting plate 305 and the first adjusting ring 2, the pressure contact of the directional wheel 206 on the second adjusting ring 201 disappears, and the spring telescopic rod 401 quickly lifts the linkage ring 4 and the second fixing rod 203, so that the second adjusting ring 201 is close to the directional wheel 206, ensuring that the lifting height of the first adjusting ring 2 and the second adjusting ring 201 are equal, ensuring that the opening of the first blade 1022 and the second blade 1032 are consistent, and then starting the drive motor 302 to drive the gear 303 to rotate The gear 303 and the gear ring 304 are meshed with each other through the toothed belt to drive the lower hopper 101 and the stator air cage 103 to separate the coal powder. The baffle 5 can protect the spiral rod 204 to prevent the coal powder from clogging the spiral rod 204 and affecting the opening adjustment of the first blade 1022 and the second blade 1032. The bolt 602 is inserted into the interior of the mounting hole 601 and is threadedly connected to the inner top surface of the housing 1, so that the stator air cage 103 can be detachably installed inside the housing 1, which is convenient for disassembly and maintenance at any time, and the coal powder that meets the fineness standard can be discharged through the discharge pipe 7.

[0041] The above shows and describes the basic principles and main features of the present invention and the advantages of the present invention. It should be understood by those skilled in the art that the present invention is not limited by the above embodiments, and the above embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, and these changes and improvements all fall within the scope of the present invention to be protected.

Claims

1. A coal powder fineness adjustment mechanism at the outlet of a power plant coal mill, comprising a housing (1), characterized in that: The top surface of the outer shell (1) is rotatably connected to a lower hopper (101); the bottom end of the lower hopper (101) is connected to and fixed with a coarse material return hopper (104); a rotor wind cage (102) is fixed to the outer wall of the coarse material return hopper (104); a stator wind cage (103) is arranged inside the outer shell (1); the top surfaces of the rotor wind cage (102) and the stator wind cage (103) are both provided with adjustment components; the adjustment components include a first adjustment ring (2) and a second adjustment ring (201) respectively arranged on the top surfaces of the rotor wind cage (102) and the stator wind cage (103); the bottom surfaces of the first adjustment ring (2) and the second adjustment ring (201) are respectively fixed with a plurality of first fixing rods (202) and a plurality of second fixing rods (203); the first fixing rods (202) and the top surface of the outer shell (1) are penetrated and slidably inserted.

2. The coal powder fineness adjustment mechanism at the outlet of a power plant coal mill according to claim 1, characterized in that: The top surfaces of the rotor wind cage (102) and the stator wind cage (103) are both provided with a plurality of spiral rods (204). The spiral rods (204) on the rotor wind cage (102) and the stator wind cage (103) are respectively slidably inserted into the outer walls of the first fixed rod (202) and the second fixed rod (203). The internal slots of the first fixed rod (202) and the second fixed rod (203) are adapted to the spiral outer walls of the spiral rods (204). The rotor wind cage (102) includes two Two first fixing rings (1021) are arranged at intervals in the upper and lower parts, and a first fan blade (1022) is rotatably connected between the two first fixing rings (1021). The stator wind cage (103) includes two second fixing rings (1031) arranged at intervals in the upper and lower parts, and a second fan blade (1032) is rotatably connected between the two second fixing rings (1031). A plurality of spiral rods (204) are respectively fixed to the top ends of the first fan blade (1022) and the second fan blade (1032).

3. The coal powder fineness adjustment mechanism at the outlet of a power plant coal mill according to claim 2, characterized in that: An L-shaped rod (205) is fixed to the inner wall of the first adjustment ring (2) near the front and rear sides. The L-shaped rod (205) penetrates the outer wall of the housing (1) and is slidably inserted and extends to the top of the second adjustment ring (201).

4. The coal powder fineness adjustment mechanism at the outlet of a power plant coal mill according to claim 3, characterized in that: A directional wheel (206) is fixed to the bottom end of the L-shaped rod (205), and a roller of the directional wheel (206) is in contact with the top surface of the second adjustment ring (201).

5. The coal powder fineness adjustment mechanism at the outlet of the power plant coal mill according to claim 4, characterized in that: Connecting plates (305) are fixed on both sides of the inner wall of the first adjustment ring (2); mounting frames (3) are fixed on the top surface of the outer shell (1) near the left and right sides; a hydraulic rod (301) is fixed on the top surface of the mounting frame (3); one end of the telescopic rod of the hydraulic rod (301) passes through the top surface of the mounting frame (3) and is fixed to the top surface of the connecting plate (305); and a support plate (306) is fixed on the front side of the outer shell (1).

6. The coal powder fineness adjustment mechanism at the outlet of a power plant coal mill according to claim 5, characterized in that: A driving motor (302) is fixed on the top surface of the support plate (306), a gear (303) is fixed on one end of the telescopic rod of the driving motor (302), a gear ring (304) is fixed on the outer wall of the lower hopper (101), and the gear (303) and the gear ring (304) are meshed and driven by a toothed belt.

7. The coal powder fineness adjustment mechanism at the outlet of a power plant coal mill according to claim 6, characterized in that: A linkage ring (4) is provided below the first adjustment ring (2) and the second adjustment ring (201); a plurality of first fixing rods (202) and a plurality of second fixing rods (203) are respectively penetrated and fixed to the top surfaces of the two linkage rings (4); a plurality of spring telescopic rods (401) are fixed to the top surfaces of the rotor wind cage (102) and the stator wind cage (103); and the spring telescopic rods (401) on the rotor wind cage (102) and the stator wind cage (103) are respectively fixed to the bottom surfaces of the two linkage rings (4).

8. The coal powder fineness adjustment mechanism at the outlet of a power plant coal mill according to claim 7, characterized in that: A blocking cover (5) is fixed on the top surfaces of the first adjustment ring (2) and the second adjustment ring (201), and a plurality of first fixing rods (202) and a plurality of second fixing rods (203) are all inserted through the top surfaces of the blocking cover (5) and are slidably disposed thereon.

9. The coal powder fineness adjustment mechanism at the outlet of a power plant coal mill according to claim 8, characterized in that: The outer wall of the stator air cage (103) is fixed with mounting plates (6) near the four sides of the front, back, left and right. The top surface of the mounting plate (6) is provided with a mounting hole (601). Bolts (602) are slidably inserted into the interior of the mounting hole (601). The bolts (602) are threadedly connected to the inner top surface of the housing (1).

10. The coal powder fineness adjustment mechanism at the outlet of a power plant coal mill according to claim 9, characterized in that: Two discharge pipes (7) are connected and fixed on the top surface of the shell (1) near the left and right sides.

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