A coal mill outlet temperature deviation optimization control device

Abstract

A coal mill outlet temperature deviation optimization control device, belonging to the field of coal mill technology, addresses the problem that existing coal mill outlet temperature regulation equipment easily leads to spontaneous combustion of pulverized coal after adjustment. This invention controls the reverse rotation of two air dampers via a motor and transmission components, achieving opposite regulation of cold air volume and primary air volume. This allows for precise response to changes in operating conditions. The motor drives the transmission rod to rotate, pushing the sealing plate to move and adjusting its heat dissipation area on the spiral guide plate. The heat dissipation area is related to the cold air volume; as the cold air volume increases, the sealing plate moves towards increasing the heat dissipation area. When the coal mill outlet temperature rises, the cold air first dissipates heat from the coal pipe, preventing combustion of pulverized coal inside. Subsequently, the cold air mixes with the primary air before entering the coal mill, preventing a significant drop in internal temperature that could affect the drying effect of pulverized coal. This effectively alleviates the problems of incomplete pulverized coal drying and excessively high temperatures due to pulverized coal accumulation in the coal pipe, thus improving safety.

Description

Technical Field

[0001] This invention relates to the field of coal mill technology, and in particular to a coal mill outlet temperature deviation optimization control device. Background Technology

[0002] Coal is commonly used as fuel in thermal power generation. Pulverized coal is a combustible substance. When the outlet temperature of the coal mill is too high, the ambient temperature of the pulverized coal also increases. Pulverized coal has a high specific surface area and a large contact area with air. Its ignition point will decrease as the temperature and oxygen concentration increase. A suitable outlet temperature can ensure that the pulverized coal is well dried. If the temperature is too low, the moisture content in the pulverized coal will be too high, and the damp pulverized coal is prone to caking.

[0003] During the grinding process inside the coal mill, coal absorbs heat and evaporates to dry it. Once inside the coal pipe, its dry state and high temperature make it highly susceptible to spontaneous combustion or even explosion. Current methods control the internal temperature by changing the ratio and volume of cold air and primary air entering the coal mill. However, the coal mill outlet temperature is affected by various factors such as primary air temperature, coal particle size, coal moisture content, and coal type. Furthermore, the primary air temperature is unstable, and its adjustment is lagging and uncertain. While this reduces the coal mill outlet temperature, it can easily lead to incomplete drying of the coal powder, causing it to clump and accumulate at the coal mill outlet. Under continuous high temperature and oxidation, the clumped coal powder is still prone to spontaneous combustion. Summary of the Invention

[0004] The purpose of this invention is to provide a coal mill outlet temperature deviation optimization control device, which solves the problem that existing coal mill outlet temperature regulation equipment in the background art is prone to coal powder spontaneous combustion after regulation.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a coal mill outlet temperature deviation optimization control device, comprising an air inlet pipe connected to the air inlet of the coal mill and a coal pipe connected to the outlet of the coal mill. Specifically, the left ends of the air inlet pipe and the coal pipe are respectively connected to the air inlet and outlet of the coal mill. The end of the air inlet pipe away from the air inlet of the coal mill is connected to a cold air pipe and a primary air pipe. A flexible connecting pipe is installed on the top of the cold air pipe. Both the cold air pipe and the primary air pipe are equipped with air dampers. The two sets of air dampers are used to control the cold air volume and the primary air volume, respectively. A spiral guide plate is installed on the outside of the coal pipe. An extendable and adjustable lateral length air duct adjustment component is also installed on the outside of the coal pipe. The lower part of the air duct adjustment component is connected to the flexible connecting pipe. A drive mechanism is provided on the outside of the air duct adjustment component. The drive mechanism is used to adjust the extension length of the air duct adjustment component and control the air volume of the two sets of air dampers. Temperature sensors are installed on the coal pipe, the air inlet pipe, the cold air pipe, and the primary air pipe.

[0006] The air duct adjustment assembly includes a sealing ring, a first movable ring, a second movable ring, a third movable ring, and a sealing plate arranged sequentially outside the coal pipe. One end of the sealing ring is closed and encloses a spiral guide plate. A cold air inlet pipe is installed on the sealing ring near the coal mill outlet. The sealing ring, the first movable ring, the second movable ring, and the third movable ring are slidably connected in sequence. The sealing plate is threadedly connected to the spiral guide plate, and the sealing plate is rotatably connected to the third movable ring through a first rotating ring, as shown in the figure. A cold air collecting plate is provided at the bottom of the third movable ring, and the cold air collecting plate is connected to the third movable ring and the flexible connecting pipe. Cold air enters from the cold air inlet pipe and flows around under the guidance of the spiral guide plate. It mixes with the primary air entering from the primary air pipe through the cold air collecting plate, the flexible connecting pipe, and the cold air pipe, and finally enters the coal mill through the air inlet pipe. Before entering, the cold air dissipates heat from the coal pipe according to the lengths of the sealing ring, the first movable ring, the second movable ring, and the third movable ring to reduce the temperature inside the coal pipe.

[0007] Furthermore, the sealing ring, the first movable ring, and the second movable ring are provided with sliding grooves on their exteriors, and the first movable ring, the second movable ring, and the third movable ring are provided with sliders corresponding to the sliding grooves inside. A return spring is fixedly installed between the sealing ring and the sealing plate. The length of the sealing plate is greater than the length of the sealing ring, the first movable ring, and the second movable ring, so that the cold air collecting plate will not be blocked by the second movable ring after it contracts. The exterior of the spiral guide plate is stepped, and the exterior of the spiral guide plate fits into the sealing ring, the first movable ring, the second movable ring, and the third movable ring after they are unfolded.

[0008] Furthermore, the air damper includes a housing and a gate plate movably disposed inside the housing. Multiple sets of gate plates are provided. Multiple sets of rotating shafts are radially distributed on the housing. The rotating shafts extend into the housing and are fixedly connected to the gate plates, and are rotatably connected to the housing. A linkage ring is rotatably connected to the outside of the housing. The linkage ring is movably connected to the rotating shafts via connecting rods. A manual pull rod is also fixedly connected to the linkage ring. When airflow needs to be adjusted, one set of rotating shafts is controlled to rotate. The rotating shafts drive the linkage rings to rotate via connecting rods. The linkage rings drive other rotating shafts to rotate via other connecting rods, ultimately causing the gate plate inside the housing to rotate and adjust the opening size.

[0009] Furthermore, the coal pipe is externally fixedly connected to a fixing plate and a mounting shell. The drive mechanism includes a motor fixedly installed outside the mounting shell, and a drive rod is fixedly connected to the output end of the motor, extending into the interior of the mounting shell. A reduction gearbox is provided at the bottom of the mounting shell, and the middle part of the drive rod is connected to the reduction gearbox via a second gear set and a shaft. A first rotating rod is connected below the reduction gearbox.

[0010] Furthermore, the other end of the first rotating rod is connected to one of the sets of rotating shafts inside the air damper on the primary air duct. A second rotating rod is connected to one of the sets of rotating shafts inside the air damper on the cold air duct. A first gear set is installed between the second rotating rod and the first rotating rod. When the motor rotates, it drives the first rotating rod to rotate through the drive rod, the second gear set and the reduction gearbox, and drives the second rotating rod through the first gear set. When the first rotating rod and the second rotating rod rotate, they adjust the air volume of the air damper. When the air volume of the cold air duct increases, the air volume of the primary air duct decreases, and when the air volume of the cold air duct decreases, the air volume of the primary air duct increases.

[0011] Furthermore, the drive mechanism also includes a transmission rod rotatably connected between the spiral guide plate and the mounting shell, and a threaded rod fixedly connected between the spiral guide plate and the mounting shell. The transmission rod and the drive rod are connected via a third gear set, a shaft, and a fourth gear set. The transmission rod has evenly distributed tooth grooves on its surface and meshes with the sealing plate. A spur gear is threaded onto the threaded rod and meshes with the transmission rod. A third rotating ring is rotatably connected to the side of the spur gear, and a second rotating ring is rotatably connected to the outer side of the sealing plate. The second rotating ring and the third rotating ring... A connecting frame is provided between the components. When the motor drives the drive rod to rotate, it drives the transmission rod to rotate through the third gear set, shaft, and fourth gear set. When the transmission rod rotates, it drives the sealing plate and spur gear to rotate. When the spur gear rotates, it moves on the threaded rod, which in turn pushes the sealing plate to move through the connecting frame and the second rotating ring, reducing the friction between the sealing plate and the spiral guide plate. After the sealing plate moves, it adjusts the heat dissipation area of ​​the spiral guide plate. When the air volume inside the cold air duct increases, the sealing plate moves to the right, increasing the heat dissipation area. When the air volume inside the cold air duct decreases, the sealing plate moves to the left, decreasing the heat dissipation area.

[0012] Compared with the prior art, the beneficial effects of the present invention are:

[0013] This invention provides a coal mill outlet temperature deviation optimization control device. Through a motor and transmission components, it achieves linked control of the upper air dampers of the cold air duct and primary air duct, causing the dampers to rotate in opposite directions. This achieves reverse adjustment of the cold air volume and primary air volume, precisely responding to changes in operating conditions. The motor drives the transmission rod to rotate, pushing the sealing plate to move and adjusting its heat dissipation area on the spiral guide plate. The heat dissipation area is related to the cold air volume; when the cold air volume increases, the sealing plate moves towards increasing the heat dissipation area. When the coal mill outlet temperature rises, the cold air first dissipates heat from the coal pipe, preventing the coal powder inside from burning. Subsequently, the cold air mixes with the primary air and enters the coal mill. Before entering, the cold air's temperature is slightly higher due to heat dissipation from the coal pipe, preventing a significant drop in the internal temperature of the coal mill from affecting the coal powder drying effect. This effectively alleviates the problems of incomplete coal powder drying and excessively high temperatures caused by coal powder accumulation in the coal pipe, improving safety. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0015] Figure 2 This is a schematic diagram of the air inlet pipe, air damper, and coal pipe structure of the present invention;

[0016] Figure 3 This is a schematic diagram of the airlock structure of the present invention;

[0017] Figure 4 This is a detailed structural diagram of the airlock of the present invention;

[0018] Figure 5 This is an exploded view of the coal pipe, air duct regulating assembly, and drive mechanism of the present invention.

[0019] Figure 6 This is a schematic diagram of the air duct adjustment component structure of the present invention;

[0020] Figure 7 This is a cross-sectional view of the air duct adjustment component structure of the present invention;

[0021] Figure 8 This is a schematic diagram of the sealing plate and driving mechanism of the present invention.

[0022] In the diagram: 1. Inlet duct; 11. Cold air duct; 12. Primary air duct; 13. Flexible connecting pipe; 2. Air damper; 21. Outer shell; 22. Gate plate; 23. Linkage ring; 231. Manual pull rod; 24. Rotating shaft; 25. Connecting rod; 26. First rotating rod; 27. Second rotating rod; 28. First gear set; 3. Coal pipe; 31. Spiral guide plate; 32. Fixing plate; 33. Mounting shell; 34. Gearbox; 4. Air duct adjustment assembly; 41. Sealing ring; 42. First... 43. Movable ring; 44. Second movable ring; 45. Third movable ring; 46. Sealing plate; 47. First rotating ring; 48. Second rotating ring; 49. Cold air inlet pipe; 40. Cold air collecting plate; 51. Return spring; 52. Drive mechanism; 53. Motor; 54. Drive rod; 55. Second gear set; 56. Third gear set; 57. Fourth gear set; 58. Transmission rod; 59. Threaded rod; 50. Spur gear; 51. Third rotating ring; 52. Connecting frame. Detailed Implementation

[0023] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0024] To address the technical problem that existing coal mill outlet temperature regulation equipment easily leads to spontaneous combustion of pulverized coal after regulation, such as... Figures 1-8 As shown, the following preferred technical solutions are provided:

[0025] like Figures 1-2 As shown, a coal mill outlet temperature deviation optimization control device includes an air inlet pipe 1 connected to the air inlet of the coal mill and a coal pipe 3 connected to the coal mill outlet. Specifically, the left ends of the air inlet pipe 1 and the coal pipe 3 are connected to the air inlet and outlet of the coal mill, respectively. The end of the air inlet pipe 1 away from the air inlet of the coal mill is connected to a cold air pipe 11 and a primary air pipe 12. A flexible connecting pipe 13 is installed on the top of the cold air pipe 11. Both the cold air pipe 11 and the primary air pipe 12 are equipped with air dampers 2. The two sets of air dampers 2 are used to control the temperature deviation. The cold air volume and primary air volume are as follows: a spiral guide plate 31 is installed on the outside of the coal pipe 3, and an adjustable lateral length air duct adjustment component 4 is also installed on the outside of the coal pipe 3. The lower part of the air duct adjustment component 4 is connected to the flexible connecting pipe 13. A drive mechanism 5 is provided on the outside of the air duct adjustment component 4. The drive mechanism 5 is used to adjust the extension length of the air duct adjustment component 4 and control the air volume of the two sets of air dampers 2. Temperature sensors are installed on the coal pipe 3, the air inlet pipe 1, the cold air pipe 11 and the primary air pipe 12.

[0026] like Figures 5-6 As shown, the air duct regulating assembly 4 includes a sealing ring 41, a first movable ring 42, a second movable ring 43, a third movable ring 44, and a sealing plate 45 sequentially arranged outside the coal pipe 3. One end of the sealing ring 41 is closed and encloses the spiral guide plate 31. A cold air inlet pipe 46 is installed near the coal mill outlet end of the sealing ring 41. The sealing ring 41, the first movable ring 42, the second movable ring 43, and the third movable ring 44 are sequentially slidably connected. The sealing plate 45 is threadedly connected to the spiral guide plate 31, and the sealing plate 45 and the third movable ring 44 are rotatably connected via a first rotating ring 451. Figure 7 As shown, a cold air collecting plate 47 is provided at the bottom of the third movable ring 44. The cold air collecting plate 47 is connected to the third movable ring 44 and the flexible connecting pipe 13. The cold air enters from the cold air inlet pipe 46 and flows around under the guidance of the spiral guide plate 31. It mixes with the primary air entering from the cold air collecting plate 47, the flexible connecting pipe 13 and the cold air pipe 11 with the primary air entering from the primary air pipe 12. Finally, it enters the coal mill through the air inlet pipe 1. Before entering, the cold air dissipates heat from the coal pipe 3 according to the length of the sealing ring 41, the first movable ring 42, the second movable ring 43 and the third movable ring 44 to reduce the temperature inside the coal pipe 3.

[0027] like Figure 6 and Figure 7As shown, the sealing ring 41, the first movable ring 42, and the second movable ring 43 are provided with sliding grooves on their exteriors. The first movable ring 42, the second movable ring 43, and the third movable ring 44 are provided with sliders corresponding to the sliding grooves inside their interiors. A return spring 48 is fixedly installed between the sealing ring 41 and the sealing plate 45. The length of the sealing plate 45 is greater than the length of the sealing ring 41, the first movable ring 42, and the second movable ring 43, so that the cold air collecting plate 47 will not be blocked by the second movable ring 43 after it contracts. The exterior of the spiral guide plate 31 is stepped, and the exterior of the spiral guide plate 31 fits into the sealing ring 41, the first movable ring 42, the second movable ring 43, and the third movable ring 44 after they are unfolded.

[0028] like Figures 3-4 As shown, the air damper 2 includes a housing 21 and a gate plate 22 movably disposed inside the housing 21. Multiple sets of gate plates 22 are provided. Multiple sets of rotating shafts 24 are radially distributed on the housing 21. The rotating shafts 24 extend into the housing 21 and are fixedly connected to the gate plate 22, and are rotatably connected to the housing 21. A linkage ring 23 is rotatably connected to the outside of the housing 21. The linkage ring 23 is movably connected to the rotating shaft 24 via a connecting rod 25. A manual pull rod 231 is also fixedly connected to the linkage ring 23. When the airflow needs to be adjusted, one set of rotating shafts 24 is controlled to rotate. The rotating shaft 24 drives the linkage ring 23 to rotate via the connecting rod 25. The linkage ring 23 drives the other rotating shafts 24 to rotate via other connecting rods 25, ultimately causing the gate plate 22 inside the housing 21 to rotate and adjust the opening size.

[0029] like Figure 5 and Figure 8 As shown, a fixing plate 32 and a mounting shell 33 are fixedly connected to the outside of the coal pipe 3. The drive mechanism 5 includes a motor 51 fixedly installed outside the mounting shell 33. A drive rod 511 is fixedly connected to the output end of the motor 51 and extends into the interior of the mounting shell 33. A reduction gearbox 34 is provided at the bottom of the mounting shell 33. The middle part of the drive rod 511 is connected to the reduction gearbox 34 through a second gear set 52 and a shaft. A first rotating rod 26 is connected to the bottom of the reduction gearbox 34.

[0030] like Figure 3 As shown, the other end of the first rotating rod 26 is connected to one of the sets of rotating shafts 24 inside the air damper 2 on the primary air duct 12. A second rotating rod 27 is connected to one of the sets of rotating shafts 24 inside the air damper 2 on the cold air duct 11. A first gear set 28 is installed between the second rotating rod 27 and the first rotating rod 26. When the motor 51 rotates, it drives the first rotating rod 26 to rotate through the drive rod 511, the second gear set 52 and the reduction gearbox 34, and drives the second rotating rod 27 through the first gear set 28. When the first rotating rod 26 and the second rotating rod 27 rotate, they adjust the air volume of the air damper 2. When the air volume of the cold air duct 11 increases, the air volume of the primary air duct 12 decreases, and when the air volume of the cold air duct 11 decreases, the air volume of the primary air duct 12 increases.

[0031] like Figure 8 As shown, the drive mechanism 5 also includes a transmission rod 55 rotatably connected between the spiral guide plate 31 and the mounting shell 33, and a threaded rod 56 fixedly connected between the spiral guide plate 31 and the mounting shell 33. The transmission rod 55 and the drive rod 511 are connected via a third gear set 53, a shaft, and a fourth gear set 54. The transmission rod 55 has evenly distributed tooth grooves on its surface and meshes with the sealing plate 45. A spur gear 57 is threaded onto the threaded rod 56 and meshes with the transmission rod 55. A third rotating ring 58 is rotatably connected to the side of the spur gear 57, and a second rotating ring 452 is rotatably connected to the outer side of the sealing plate 45. A connection is made between the second rotating ring 452 and the third rotating ring 58. Connecting frame 581; When motor 51 drives drive rod 511 to rotate, it drives transmission rod 55 to rotate through third gear set 53, shaft and fourth gear set 54. When transmission rod 55 rotates, it drives sealing plate 45 and spur gear 57 to rotate. When spur gear 57 rotates, it moves on threaded rod 56, and then pushes sealing plate 45 to move through connecting frame 581 and second rotating ring 452, reducing friction between sealing plate 45 and spiral guide plate 31. After sealing plate 45 moves, it adjusts the heat dissipation area of ​​spiral guide plate 31. When the air volume inside cold air duct 11 increases, sealing plate 45 moves to the right, increasing heat dissipation area. When the air volume inside cold air duct 11 decreases, sealing plate 45 moves to the left, decreasing heat dissipation area.

[0032] Specifically, temperature sensors installed on coal pipe 3, air inlet pipe 1, cold air pipe 11, and primary air pipe 12 monitor the temperature of each part in real time. When the temperature is too high, motor 51 rotates, and drive rod 511 transmits power to reduction gearbox 34 via second gear set 52 and shaft. Reduction gearbox 34 drives first rotating rod 26 to rotate. First rotating rod 26 is connected to a set of rotating shafts 24 in air damper 2 on primary air pipe 12, causing the rotating shafts 24 to rotate. A set of rotating shafts 24 in air damper 2 on cold air pipe 11 is connected to first rotating rod 26 via second rotating rod 27, and the two are linked by first gear set 28. When the rotating shafts 24 of air damper 2 on primary air pipe 12 rotate, they drive other rotating shafts 24 and gate 22 to rotate via connecting rod 25 and linkage ring 23, reducing the primary air volume. At the same time, air damper 2 on cold air pipe 11 is linked, and gate 22 reverses direction. The rotation increases the volume of cold air, thereby reducing the temperature of the mixed air entering the coal mill and removing more heat from the inside of the coal mill for cooling. Simultaneously, the motor 51 drives the drive rod 511 to rotate, which in turn drives the transmission rod 55 to rotate via the third gear set 53, the shaft, and the fourth gear set 54. When the transmission rod 55 rotates, it meshes with the sealing plate 45, causing the sealing plate 45 to rotate. Furthermore, the transmission rod 55 drives the spur gear 57, which meshes with it, to rotate. The spur gear 57 moves on the threaded rod 56 and pushes the sealing plate 45 to move via the connecting frame 581 and the second rotating ring 452, reducing the friction between the sealing plate 45 and the spiral guide plate 31. This causes the sealing plate 45 to move to the right, increasing the heat dissipation area of ​​the cold air flowing through the spiral guide plate 31 and the coal pipe 3, thus enhancing heat dissipation from the coal pipe 3.

[0033] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0034] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A coal mill outlet temperature deviation optimization control device, comprising an air inlet pipe (1) connected to the air inlet of the coal mill and a coal pipe (3) connected to the outlet of the coal mill, characterized in that: The end of the air inlet pipe (1) away from the air inlet of the coal mill is connected to the cold air pipe (11) and the primary air pipe (12). The top of the cold air pipe (11) is equipped with a flexible connecting pipe (13). Both the cold air pipe (11) and the primary air pipe (12) are equipped with air dampers (2). The two sets of air dampers (2) are used to control the cold air volume and the primary air volume, respectively. The outside of the coal pipe (3) is equipped with a spiral guide plate (31). The outside of the coal pipe (3) is also equipped with a duct adjustment component (4) with an adjustable horizontal length. The inside of the duct adjustment component (4) is connected to the flexible connecting pipe (13). The outside of the duct adjustment component (4) is equipped with a drive mechanism (5). The drive mechanism (5) is used to adjust the extension length of the duct adjustment component (4) and control the air volume of the two sets of air dampers (2). Temperature sensors are installed on the coal pipe (3), the air inlet pipe (1), the cold air pipe (11) and the primary air pipe (12). The air duct adjustment assembly (4) includes a sealing ring (41), a first movable ring (42), a second movable ring (43), a third movable ring (44), and a sealing plate (45) arranged sequentially outside the coal pipe (3). One end of the sealing ring (41) is closed and wraps the spiral guide plate (31) inside. A cold air inlet pipe (46) is installed near the coal mill outlet end of the sealing ring (41). The sealing ring (41), the first movable ring (42), the second movable ring (43), and the third movable ring (44) are slidably connected in sequence. The sealing plate (45) is threadedly connected to the spiral guide plate (31), and the sealing plate (45) and the third movable ring (44) are rotatably connected through a first rotating ring (451). A cold air collecting plate (47) is provided at the bottom of the third movable ring (44). The cold air collecting plate (47) is connected to the third movable ring (44) and the flexible connecting pipe (13).

2. The coal mill outlet temperature deviation optimization control device as described in claim 1, characterized in that: The sealing ring (41), the first movable ring (42) and the second movable ring (43) are provided with sliding grooves on the outside. The first movable ring (42), the second movable ring (43) and the third movable ring (44) are provided with sliders corresponding to the sliding grooves inside. A return spring (48) is fixedly installed between the sealing ring (41) and the sealing plate (45).

3. The coal mill outlet temperature deviation optimization control device as described in claim 1, characterized in that: The length of the sealing plate (45) is greater than the length of the sealing ring (41), the first movable ring (42), and the second movable ring (43), so that the cold air collecting plate (47) will not be blocked by the second movable ring (43) after it contracts.

4. The coal mill outlet temperature deviation optimization control device as described in claim 1, characterized in that: The outer surface of the spiral guide plate (31) is stepped, and the outer surface of the spiral guide plate (31) is attached to the sealing ring (41), the first movable ring (42), the second movable ring (43) and the third movable ring (44) after unfolding.

5. The coal mill outlet temperature deviation optimization control device as described in claim 1, characterized in that: The airlock (2) includes an outer shell (21) and a gate plate (22) movably disposed inside the outer shell (21). The gate plate (22) is provided in multiple sets. The outer shell (21) has multiple sets of rotating shafts (24) radially distributed. The rotating shafts (24) extend into the outer shell (21) and are fixedly connected to the gate plate (22). The rotating shafts (24) are rotatably connected to the outer shell (21). A linkage ring (23) is rotatably connected to the outer shell (21). The linkage ring (23) is movably connected to the rotating shaft (24) through a connecting rod (25). A manual pull rod (231) is also fixedly connected to the linkage ring (23).

6. The coal mill outlet temperature deviation optimization control device as described in claim 5, characterized in that: The coal pipe (3) is externally fixedly connected to a fixing plate (32) and a mounting shell (33). The drive mechanism (5) includes a motor (51) fixedly installed outside the mounting shell (33). The output end of the motor (51) is fixedly connected to a drive rod (511), which extends into the interior of the mounting shell (33).

7. The coal mill outlet temperature deviation optimization control device as described in claim 6, characterized in that: The bottom of the mounting housing (33) is provided with a reduction gearbox (34). The middle part of the drive rod (511) is connected to the reduction gearbox (34) through the second gear set (52) and the shaft. The bottom of the reduction gearbox (34) is connected with a first rotating rod (26).

8. The coal mill outlet temperature deviation optimization control device as described in claim 7, characterized in that: The other end of the first rotating rod (26) is connected to one of the sets of rotating shafts (24) inside the air damper (2) on the primary air duct (12). A second rotating rod (27) is connected to one of the sets of rotating shafts (24) inside the air damper (2) on the cold air duct (11). A first gear set (28) is installed between the second rotating rod (27) and the first rotating rod (26).

9. The coal mill outlet temperature deviation optimization control device as described in claim 8, characterized in that: The drive mechanism (5) also includes a transmission rod (55) rotatably connected between the spiral guide plate (31) and the mounting shell (33), and a threaded rod (56) fixedly connected between the spiral guide plate (31) and the mounting shell (33), wherein the transmission rod (55) and the drive rod (511) are connected by a third gear set (53), a shaft and a fourth gear set (54).

10. The coal mill outlet temperature deviation optimization control device as described in claim 9, characterized in that: The transmission rod (55) has evenly distributed tooth grooves on its surface. The transmission rod (55) meshes with the sealing plate (45). A spur gear (57) is threaded onto the threaded rod (56). The spur gear (57) meshes with the transmission rod (55). A third rotating ring (58) is rotatably connected to the side of the spur gear (57). A second rotating ring (452) is rotatably connected to the outside of the sealing plate (45). A connecting frame (581) is connected between the second rotating ring (452) and the third rotating ring (58).

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