Air preheating device for boiler

Abstract

The utility model discloses a boiler air preheating device which comprises a preheating box, a filter cylinder, a circulation assembly, a blocking assembly, a dredging assembly, a scraping assembly, a blowing assembly and a driving assembly. A plurality of filter holes are formed in the end face of one end of the filter cartridge, and the filter cartridge is arranged in the preheating box; the circulation assembly rotationally penetrates through the preheating box; the blocking assembly is connected with the circulation assembly; one end of the dredging assembly movably penetrates through the preheating box, and the dredging assembly is connected with the blocking assembly; the scraping assembly is movably arranged in the preheating box and can abut against the end face of one end of the filter cartridge and the inner top face of the preheating box; the blowing assembly is positioned below the filter cartridge and is connected with the circulating assembly; the driving assembly is connected with the dredging assembly and used for enabling the dredging assembly and the blocking assembly to move in the vertical direction, so that the dredging assembly can be partially inserted into the filter holes in a reciprocating mode, and air in the circulation assembly intermittently flows into the part, located in the preheating box, of the circulation assembly.

Description

Technical Field

[0001] This application relates to the field of boiler air preheating technology, and more particularly to a boiler air preheating device. Background Technology

[0002] A boiler air preheating device is a heat exchange device installed in the boiler flue. Its main function is to preheat the air entering the boiler combustion chamber in order to improve the boiler's thermal efficiency, reduce energy consumption, and reduce pollutant emissions.

[0003] Currently, some boiler air preheating devices preheat air by simply installing an air supply pipe extending in a certain direction inside the heat exchange box, allowing the air in the supply pipe to exchange heat with the high-temperature flue gas entering the heat exchange box. This results in a short residence time for the air and high-temperature flue gas inside the heat exchange box, leading to poor preheating effect. Utility Model Content

[0004] The purpose of this application is to provide a boiler air preheating device to solve the problem of poor air preheating effect of existing boiler air preheating devices.

[0005] The technical solution to the above-mentioned technical problems in this application is as follows:

[0006] A boiler air preheating device includes a preheating box, with a flue gas inlet pipe at the top of the preheating box, and further includes:

[0007] The filter cartridge has multiple filter holes on one end face and is placed inside the preheating box.

[0008] The flow assembly is rotatably installed in the preheating box;

[0009] Barrier components, connecting flow components;

[0010] The unblocking component has one end that is movably inserted into the preheating box, and the unblocking component is connected to the blocking component.

[0011] The scraping component is movably located inside the preheating box and can abut against one end face of the filter cartridge and the inner top surface of the preheating box;

[0012] A blowing assembly, located below the filter cartridge and connected to the flow assembly; and,

[0013] The drive assembly connects to the unblocking assembly and is used to move the unblocking assembly and the blocking assembly in a vertical direction, so that the unblocking assembly part can reciprocate into the filter hole, allowing the air in the flow assembly to flow intermittently into the part of the flow assembly located in the preheating box; the drive assembly connects to the flow assembly and is used to rotate the flow assembly, so that the blowing assembly rotates and blows the flue gas upward; the drive assembly connects to the scraping assembly and is used to move the scraping assembly in a horizontal direction to repeatedly cover the flue gas inlet pipe.

[0014] Furthermore, the circulation components include:

[0015] The mounting box is fixedly installed on the top of the preheating box, and the inner side wall of the mounting box is slidably connected to the barrier component;

[0016] The first vent pipe connects to the side wall of the mounting box; and,

[0017] The second vent pipe is rotatably connected to the bottom wall of the mounting box and rotatably passes through the preheating box. The second vent pipe is connected to the drive assembly.

[0018] Furthermore, the portion of the second vent pipe located inside the preheating chamber is curved.

[0019] Furthermore, the blowing assembly includes multiple fan blades fixedly connected to the outer wall of the second vent pipe.

[0020] Furthermore, the blocking component includes a push rod and a sealing plug. The sealing plug is slidably connected to the inner wall of the mounting box, one end of the push rod is fixedly connected to the sealing plug, and the other end is fixedly connected to the unblocking component.

[0021] Furthermore, the unblocking components include:

[0022] The movable rod has one end movably inserted into the preheating box, and the other end is connected to the drive assembly and fixedly connected to the other end of the push rod;

[0023] A fixed plate is used to securely connect one end of the movable rod; and,

[0024] Multiple unclogging rods are fixedly connected to a fixing plate on the surface away from the moving rod and positioned above multiple filter holes. The unclogging rods are made of rubber.

[0025] Furthermore, the driving components include:

[0026] The fixed shell is fixedly connected to the preheating box, and the top and bottom of the fixed shell are provided with square holes extending in the horizontal direction;

[0027] The first gear is located inside the fixed housing;

[0028] Movable plate, sliding connection to fixed shell;

[0029] The connecting plate is rotatably connected to the first gear and the movable plate at both ends;

[0030] The motor is fixedly connected to the housing, and the output shaft of the motor extends into the housing and is connected to the first gear.

[0031] A vertical plate passes through two square holes and is fixedly connected to the movable plate.

[0032] The connecting rod is rotatably connected at both ends to the other end of the movable rod and one end of the vertical plate.

[0033] A rack, one end of which is fixedly connected to the other end of a vertical plate, passes through the preheating chamber; and...

[0034] The second gear is fixedly connected to the outer wall of the second vent pipe and meshes with the rack.

[0035] Furthermore, the scraping component includes:

[0036] A baffle is located inside the preheating box and abuts against the inner top surface of the preheating box;

[0037] A scraper, fixedly connected to a baffle and abutting against the end face of one end of the filter cartridge; and,

[0038] A horizontal plate is movably installed inside the preheating box, and the horizontal plate is connected to the other end of the rack.

[0039] Furthermore, the filter cartridge is rotatably located inside the preheating box, and a third gear is fixedly sleeved on the outer peripheral wall of the filter cartridge. The outer peripheral wall of the preheating box is provided with a through hole, and part of the third gear extends into the through hole. Part of the first gear can extend into the through hole and mesh with the third gear.

[0040] Compared with the prior art, the technical solution of this application has the following beneficial technical effects:

[0041] By incorporating a filter cartridge, the multiple filter holes on the cartridge slow down the downward flow of flue gas, increasing the residence time of the flue gas above the cartridge and the contact time between the flue gas and the flow assembly above the cartridge, thus improving the preheating effect of the air. The operation of the drive component activates the unblocking and blocking components, allowing the unblocking component to continuously insert into multiple filter holes, preventing the holes from being clogged by dust carried in the flue gas. The blocking component's vertical back-and-forth movement allows outside air to intermittently flow into the preheating chamber, increasing the residence time of air within the flow assembly and further enhancing the preheating effect. Simultaneously, the drive component activates the unblocking and blocking components, which in turn rotate the flow assembly and activate the scraper component. The rotation of the flow assembly, along with the rotating component, blows the flue gas upwards, increasing the residence time of the flue gas within the preheating chamber and further enhancing the preheating effect of the air within the flow assembly. The scraper component's continuous covering and exposing of the flue gas inlet pipe further increases the residence time of the flue gas within the preheating chamber, improving the preheating effect of the air. The scraping component abuts against one end face of the filter cartridge during operation, which can scrape away the dust around the filter holes and further reduce the possibility of the filter holes being blocked. Attached Figure Description

[0042] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0043] Figure 1 This is a schematic diagram of the boiler air preheating device of this application.

[0044] Explanation of reference numerals in the attached figures:

[0045] 1. Preheating box; 2. Barrier assembly; 3. Unblocking assembly; 4. Drive assembly; 5. Flow assembly; 6. Smoke inlet pipe; 7. First vent pipe; 8. Mounting box; 9. Push rod; 10. Sealing plug; 11. Second vent pipe; 12. Rack; 13. Second gear; 14. Horizontal plate; 15. Scraper; 16. Baffle; 17. Fan blade; 18. Moving rod; 19. Fixed plate; 20. Unblocking rod; 21. Connecting rod; 22. Vertical plate; 23. Fixed shell; 24. Movable plate; 25. Connecting plate; 26. First gear; 27. Motor; 28. Third gear; 29. ​​Filter cartridge; 30. Filter holes.

[0046] The realization of the purpose, functional features and advantages of this application will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0047] To make the objectives, technical solutions, and advantages of this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the scope of this application.

[0048] Please see Figure 1 This application proposes a boiler air preheating device, including a preheating box 1, with a flue gas inlet pipe 6 at the top of the preheating box 1, and further comprising:

[0049] The filter cartridge 29 has multiple filter holes 30 on one end face and is placed inside the preheating box 1.

[0050] The flow component 5 is rotatably installed in the preheating box 1;

[0051] Barrier component 2 connects to flow component 5;

[0052] The unblocking component 3 has one end movably inserted into the preheating box 1, and the unblocking component 3 is connected to the blocking component 2.

[0053] The scraping component is movably located inside the preheating box 1 and can abut against one end face of the filter cartridge 29 and the inner top surface of the preheating box 1;

[0054] The blowing assembly is located below the filter cartridge 29 and connected to the flow assembly 5; and,

[0055] The drive assembly 4 is connected to the unblocking assembly 3, which is used to move the unblocking assembly 3 and the blocking assembly 2 in the vertical direction, so that the unblocking assembly 3 can be reciprocated into the filter hole 30, so that the air in the flow assembly 5 can flow intermittently into the part of the flow assembly 5 located in the preheating box 1; the drive assembly 4 is connected to the flow assembly 5, which is used to rotate the flow assembly 5, so that the blowing assembly rotates and blows the flue gas upward; the drive assembly 4 is connected to the scraping assembly, which is used to move the scraping assembly in the horizontal direction, so as to repeatedly cover the flue gas inlet pipe 6.

[0056] When air preheating is required, air is introduced into the flow assembly 5 and then into the preheating chamber 1. High-temperature flue gas enters the preheating chamber 1 through the inlet pipe 6 and exchanges heat with the air through the flow assembly 5, increasing the temperature of the air within the flow assembly 5. By setting up the filter cartridge 29, the multiple filter holes 30 on the cartridge 29, relative to a large opening, slows the downward flow of the flue gas, increases the residence time of the flue gas above the filter cartridge 29, and increases the contact time between the flue gas and the portion of the flow assembly 5 above the filter cartridge 29, thus improving the preheating effect. The operation of the drive assembly 4 causes the unblocking assembly 3 and the blocking assembly 2 to reciprocate vertically, allowing the unblocking assembly 3 to continuously insert into the multiple filter holes 30, preventing the filter holes 30 from being blocked by dust carried in the flue gas and facilitating the passage of the flue gas. The blocking component 2 moves back and forth vertically, allowing outside air to flow intermittently into the preheating chamber 1, increasing the residence time of air in the flow assembly 5, further increasing the heat exchange time between the air and the flue gas, and further improving the preheating effect of the air. The driving component 4, while moving the unblocking component 3 and the blocking component 2, also rotates the flow assembly 5 and the scraping component. The rotation of the flow assembly 5, along with the rotating component, blows the flue gas upwards, increasing the residence time of the flue gas in the preheating chamber 1, further improving the preheating effect of the air in the flow assembly 5. The scraping component continuously covers and exposes the opening of the flue gas inlet pipe 6, further increasing the residence time of the flue gas in the preheating chamber 1 and improving the preheating effect of the air. During its movement, the scraping component abuts against one end face of the filter cartridge 29, scraping away dust around the filter holes 30, further reducing the possibility of the filter holes 30 becoming clogged.

[0057] In a preferred embodiment, this application may be further configured such that the circulation component 5 includes:

[0058] Mounting box 8 is fixedly installed on the top of preheating box 1, and the inner side wall of mounting box 8 is slidably connected to the barrier component 2;

[0059] The first vent pipe 7 is connected to the side wall of the mounting box 8; and,

[0060] The second vent pipe 11 is rotatably connected to the bottom wall of the mounting box 8 and rotatably passes through the preheating box 1. The second vent pipe 11 passes through the filter cartridge 29 and is connected to the drive assembly 4 and the blowing assembly.

[0061] Both the first vent pipe 7 and the second vent pipe 11 connect to the interior of the mounting box 8. Outside air enters the mounting box 8 through the first vent pipe 7 and then through the mounting box 8 to the portion of the second vent pipe 11 located inside the preheating box 1. The connection point between the first vent pipe 7 and the mounting box 8 is located above the connection point between the second vent pipe 11 and the mounting box 8. The blocking component 2 can be attached to the side wall of the mounting box 8 and move vertically. When the blocking component 2 blocks the connection point between the first vent pipe 7 and the side wall of the mounting box 8, it prevents air from entering the mounting box 8 through the first vent pipe 7. When the blocking component 2 is removed from the connection point between the first vent pipe 7 and the side wall of the mounting box 8, air will resume entering the mounting box 8 through the first vent pipe 7, thus allowing intermittent air entry into the mounting box 8. The first vent pipe 7 can be configured as a flexible hose, and the second vent pipe 11 can be configured as a rigid pipe. The portion of the second vent pipe 11 that penetrates the filter cartridge 29 coincides with the central axis of the filter cartridge 29, that is, the second vent pipe 11 penetrates the central portion of the filter cartridge 29.

[0062] In a preferred embodiment, the second vent pipe 11 may be further configured such that the portion within the preheating chamber 1 is curved. This curvature increases the airflow time within the second vent pipe 11, thereby increasing the air residence time within the preheating chamber 1 and improving the preheating effect. When the drive assembly 4 operates, it causes the second vent pipe 11 to rotate. This rotation of the curved second vent pipe 11 agitates the air inside, further increasing the air residence time within the second vent pipe 11. The portion of the second vent pipe 11 within the preheating chamber 1 may also be U-shaped.

[0063] In a preferred embodiment, this application may be further configured such that the blowing assembly includes a plurality of fan blades 17 fixedly connected to the outer wall of the second vent pipe 11. When the second vent pipe 11 rotates, it drives the plurality of fan blades 17 to rotate, thereby causing the downward-flowing flue gas to be blown upward, increasing the residence time of the flue gas in the preheating box 1.

[0064] In a preferred embodiment, the present application may be further configured such that: the blocking component 2 includes a push rod 9 and a sealing plug 10, the sealing plug 10 is slidably connected to the inner side wall of the mounting box 8, one end of the push rod 9 is fixedly connected to the sealing plug 10, and the other end is fixedly connected to the unblocking component 3.

[0065] The sealing plug 10 is slidably connected to the inner wall of the mounting box 8. When the drive assembly 4 is running, it will move the unblocking assembly 3, which in turn will move the push rod 9 in the vertical direction. This not only allows the sealing plug 10 to cover the connection between the first vent pipe 7 and the mounting box 8, but also pushes air downward into the second vent pipe 11 and moves upward to draw some air up from the second vent pipe 11. By continuously pushing and drawing air in this way, the residence time of air in the second air pipe and the preheating box 1 can be increased.

[0066] In a preferred embodiment, this application may be further configured such that the unblocking component 3 includes:

[0067] The movable rod 18 has one end movably inserted into the preheating box 1, and the other end is connected to the drive assembly 4 and fixedly connected to the other end of the push rod 9;

[0068] Fixed plate 19, fixedly connected to one end of movable rod 18; and,

[0069] Multiple unclogging rods 20 are fixedly connected to the surface of the fixing plate 19 away from the moving rod 18 and are located above the multiple filter holes 30. The unclogging rods 20 are made of rubber.

[0070] The operation of the drive assembly 4 causes the moving rod 18 to move vertically, and the fixed plate 19 and multiple unblocking rods 20 to continuously insert into multiple filter holes 30, removing dust and impurities from the filter holes 30 and preventing dust in the flue gas from clogging the filter holes 30. The unblocking assembly 3 may also include the moving rod 18, the fixed plate 19, and multiple stiff bristles, with the surface of the fixed plate 19 away from the moving rod 18 having multiple stiff bristles.

[0071] In a preferred embodiment, this application can be further configured such that the driving component 4 includes:

[0072] The fixed shell 23 is fixedly connected to the preheating box 1. The top and bottom of the fixed shell 23 are provided with square holes extending in the horizontal direction.

[0073] The first gear 26 is located inside the fixed housing 23;

[0074] Movable plate 24, sliding connection fixed shell 23;

[0075] The connecting plate 25 is rotatably connected at both ends to the first gear 26 and the movable plate 24, respectively.

[0076] Motor 27 is fixedly connected to fixed housing 23, and the output shaft end of motor 27 extends into fixed housing 23 and is connected to first gear 26;

[0077] Vertical plate 22 passes through two square holes and is fixedly connected to movable plate 24;

[0078] The connecting rod 21 is rotatably connected at both ends to the other end of the movable rod 18 and one end of the vertical plate 22, respectively.

[0079] Rack 12, one end of which is fixedly connected to the other end of vertical plate 22, rack 12 passes through preheating box 1, and the other end of rack 12 is connected to scraping assembly; and,

[0080] The second gear 13 is fixedly connected to the outer wall of the second vent pipe 11 and meshes with the rack 12.

[0081] When motor 27 starts, it causes the first gear 26 to rotate. The first gear 26, connecting plate 25, movable plate 24, and fixed housing 23 form a crank-slider mechanism. The rotation of the first gear 26 causes the movable plate 24 to reciprocate horizontally. When the movable plate 24 moves, it causes the vertical plate 22 to reciprocate horizontally. When the vertical plate 22 moves, it works with the connecting rod 21 to cause the moving rod 18 to move vertically. The movement of the vertical plate 22 also causes the rack 12 to move horizontally, which in turn causes the second gear 13 to rotate, and the second vent pipe 11 to rotate. In this way, the moving rod 18, the second vent pipe 11, and the scraping assembly can move synchronously with only one motor 27.

[0082] In a preferred embodiment, this application may be further configured such that the scraping component includes:

[0083] Baffle 16 is located inside the preheating box 1 and abuts against the inner top surface of the preheating box 1;

[0084] Scraper 15, fixedly connected to baffle 16 and abutting against the end face of one end of filter cartridge 29; and,

[0085] A horizontal plate 14 is movably installed inside the preheating box 1. One end of the horizontal plate 14 is connected to the other end of the rack 12, and the other end of the horizontal plate 14 is fixedly connected to the scraper 15.

[0086] When the rack 12 moves horizontally, the cross plate 14 moves horizontally, which in turn causes the scraper 15 to reciprocate horizontally, scraping away the dust around the filter holes 30. The movement of the scraper 15 causes the baffle 16 to intermittently block the inlet of the flue pipe 6, allowing the flue gas to intermittently enter the preheating box 1.

[0087] In a preferred embodiment, this application can be further configured as follows: the filter cartridge 29 is rotatably disposed inside the preheating chamber 1, and a third gear 28 is fixedly sleeved on the outer peripheral wall of the filter cartridge 29. The outer peripheral wall of the preheating chamber 1 has a through hole, and part of the third gear 28 extends into the through hole. Part of the first gear 26 can extend into the through hole and mesh with the third gear 28. When the motor 27 is started, the first gear 26 rotates, and the first gear 26 cooperates with the third gear 28 to rotate the filter cartridge 29. When the filter cartridge 29 rotates, it cooperates with the scraping assembly to scrape away dust over a larger area on the filter cartridge 29.

[0088] Working principle: During use, flue gas enters the preheating box 1 through the flue gas inlet pipe 6, while outside air enters the mounting box 8 through the first vent pipe 7 and flows into the preheating box 1 through the second vent pipe 11. Starting the motor 27 causes the first gear 26 to rotate, which in turn drives the movable plate 24 and the third gear 28 to rotate synchronously. The horizontal movement of the movable plate 24 causes the vertical plate 22 to reciprocate horizontally, which in turn causes the rack 12 to engage with the second gear 13 to rotate the second vent pipe 11. The second vent pipe 11 then rotates multiple fan blades 17, causing the flue gas to slowly move upwards, increasing the time the flue gas remains in the preheating box 1 and improving the preheating effect on the air. As the vertical plate 22 moves, it will work with the connecting rod 21 to move the moving rod 18 in the vertical direction, and the push rod 9 connected to the moving rod 18 will also move in the vertical direction. The unblocking rod 20 will continuously insert into the multiple filter holes 30 below to prevent the filter holes 30 from becoming clogged. The piston will intermittently block the first vent pipe 7 and intermittently draw air from the installation box 8, increasing the residence time of air in the second vent pipe 11 and further increasing the preheating effect on the air. When the rack 12 moves, it also causes the scraper 15 and the baffle 16 to move back and forth in the horizontal direction. The baffle 16 will repeatedly cover the flue pipe 6, causing the flue gas to enter the preheating box 1 intermittently, further increasing the residence time of the flue gas in the preheating box 1 and increasing the preheating effect of the air. The third gear 28 will cause the filter cartridge 29 to rotate. The rotation of the filter cartridge 29 will work with the scraper 15 to scrape off the dust on the filter cartridge 29 over a wider area. The flue gas after heat exchange will flow out from the flue pipe at the bottom of the preheating box 1. After heating, the air will flow out from the bottom of the preheating box 1 through the second vent pipe 11 for subsequent use.

[0089] In the accompanying drawings of this embodiment, the same or similar reference numerals correspond to the same or similar components. In the description of this application, it should be understood that if terms such as "upper," "lower," "left," and "right" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, they are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, the terms used to describe positional relationships in the accompanying drawings are only for illustrative purposes and should not be construed as limiting this patent. For those skilled in the art, the specific meaning of the above terms can be understood according to the specific circumstances.

[0090] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A boiler air preheating device, comprising a preheating box (1), wherein the top of the preheating box (1) is provided with a flue gas inlet pipe (6), characterized in that, Also includes: The filter cartridge (29) has multiple filter holes (30) on one end face and is located inside the preheating box (1). The circulation component (5) is rotatably inserted into the preheating box (1); The barrier component (2) is connected to the flow component (5); The unblocking component (3) is movably inserted into the preheating box (1) at one end, and the unblocking component (3) is connected to the blocking component (2). The scraping component is movably disposed inside the preheating box (1) and can abut against one end face of the filter cartridge (29) and the inner top surface of the preheating box (1); A blowing assembly, located below the filter cartridge (29) and connected to the flow assembly (5); and, The drive assembly (4) is connected to the unblocking assembly (3) to move the unblocking assembly (3) and the blocking assembly (2) in the vertical direction so that the unblocking assembly (3) can be reciprocated into the filter hole (30) so that the air in the flow assembly (5) can flow intermittently into the part of the flow assembly (5) located in the preheating box (1); the drive assembly (4) is connected to the flow assembly (5) to rotate the flow assembly (5) so that the blowing assembly can rotate and blow the flue gas upward; the drive assembly (4) is connected to the scraping assembly to move the scraping assembly in the horizontal direction to repeatedly cover the smoke inlet pipe (6).

2. The boiler air preheating device according to claim 1, characterized in that, The circulation component (5) includes: The mounting box (8) is fixedly installed on the top of the preheating box (1), and the barrier component (2) is slidably connected to the inner side wall of the mounting box (8). A first vent pipe (7) is connected to the side wall of the mounting box (8); and, The second vent pipe (11) is rotatably connected to the bottom wall of the mounting box (8) and rotatably passes through the preheating box (1). The second vent pipe (11) passes through the filter cartridge (29). The second vent pipe (11) connects the drive assembly (4) and the blowing assembly.

3. The boiler air preheating device according to claim 2, characterized in that, The portion of the second vent pipe (11) located inside the preheating box (1) is bent.

4. The boiler air preheating device according to claim 2, characterized in that, The blowing assembly includes a plurality of fan blades (17) fixedly connected to the outer wall of the second vent pipe (11).

5. The boiler air preheating device according to claim 2, characterized in that, The blocking component (2) includes a push rod (9) and a sealing plug (10). The sealing plug (10) is slidably connected to the inner wall of the mounting box (8). One end of the push rod (9) is fixedly connected to the sealing plug (10), and the other end is fixedly connected to the unblocking component (3).

6. The boiler air preheating device according to claim 5, characterized in that, The unblocking component (3) includes: The movable rod (18) has one end movably inserted into the preheating box (1), and the other end is connected to the drive assembly (4) and fixedly connected to the other end of the push rod (9); A fixed plate (19) is fixedly connected to one end of the movable rod (18); and, Multiple unclogging rods (20) are fixedly connected to the surface of the fixing plate (19) away from the moving rod (18) and are located above the multiple filter holes (30). The unclogging rods (20) are made of rubber.

7. The boiler air preheating device according to claim 6, characterized in that, The driving component (4) includes: A fixed shell (23) is fixedly connected to the preheating box (1). The top and bottom of the fixed shell (23) are provided with square holes extending in the horizontal direction. The first gear (26) is located inside the fixed housing (23); Movable plate (24) is slidably connected to the fixed shell (23); The connecting plate (25) is rotatably connected at both ends to the first gear (26) and the movable plate (24); The motor (27) is fixedly connected to the fixed housing (23), and the output shaft end of the motor (27) extends into the fixed housing (23) and is connected to the first gear (26). The vertical plate (22) passes through the two square holes and is fixedly connected to the movable plate (24). The connecting rod (21) is rotatably connected at both ends to the other end of the moving rod (18) and one end of the vertical plate (22); A rack (12), one end of which is fixedly connected to the other end of the vertical plate (22), the rack (12) passing through the preheating box (1), and the other end of the rack (12) connected to the scraping assembly; and, The second gear (13) is fixedly connected to the outer wall of the second vent pipe (11) and meshes with the rack (12).

8. The boiler air preheating device according to claim 7, characterized in that, The scraping assembly includes: A baffle (16) is provided inside the preheating box (1) and abuts against the inner top surface of the preheating box (1); A scraper (15) is fixedly connected to the baffle (16) and abuts against the end face of one end of the filter cartridge (29); and, A horizontal plate (14) is movably installed inside the preheating box (1). One end of the horizontal plate (14) is connected to the other end of the rack (12), and the other end of the horizontal plate (14) is fixedly connected to the scraper (15).

9. The boiler air preheating device according to claim 7, characterized in that, The filter cartridge (29) is rotatably disposed inside the preheating box (1). A third gear (28) is fixedly sleeved on the outer peripheral wall of the filter cartridge (29). A through hole is provided on the outer peripheral wall of the preheating box (1). Part of the third gear (28) extends into the through hole. Part of the first gear (26) can extend into the through hole and mesh with the third gear (28).

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