A flue gas filtering device

Abstract

The present application relates to the field of flue gas filtration, and particularly to a flue gas filtration device, which comprises a flue pipe mechanism including a main filter pipe and a secondary filter pipe, the secondary filter pipe being fixed below the main filter pipe; a locking mechanism including a first locking assembly and a second locking assembly, the second locking assembly being hinged to one side of the first locking assembly. Through the cooperation of the flue pipe mechanism and the locking mechanism, the expansion of different filter plates can be adapted according to temperature changes.

Description

Technical Field

[0001] This invention relates to the field of flue gas filtration, and in particular to a flue gas filtration device. Background Technology

[0002] An economizer is an energy-saving device primarily used in coal-fired boilers or stoves. It improves the thermal efficiency of coal-fired equipment by recovering and reusing waste heat from flue gas during combustion.

[0003] Because the economizer is connected to the boiler exhaust port, the surface of the economizer's heat exchange tubes usually accumulates a thick layer of flue gas particles over time. These particles reduce the economizer's heat exchange efficiency and affect its service life. The current solution is to clean the economizer's heat exchange tubes regularly, but the heat exchange tubes have a complex structure and are difficult to clean. If a flue gas filter plate is installed in front of the economizer, the different heat distribution between the filter plates will cause thermal expansion issues, making it difficult to secure the filter plates. Summary of the Invention

[0004] The purpose of this section is to outline some aspects of embodiments of the present invention and to briefly describe some preferred embodiments. Simplifications or omissions may be made in this section, as well as in the abstract and title of the invention, to avoid obscuring the purpose of these documents; however, such simplifications or omissions should not be construed as limiting the scope of the invention.

[0005] In view of the problems with fixing multiple filter plates in the above and / or existing flue gas filtration devices, the present invention is proposed.

[0006] Therefore, the purpose of this invention is to provide a flue gas filtration device that can adapt to the expansion of different filter plates according to temperature changes.

[0007] To solve the above-mentioned technical problems, the present invention provides the following technical solution: a flue gas filtration device, comprising a flue mechanism including a main filter tube and a secondary filter tube, wherein the secondary filter tube is fixed below the main filter tube; and a locking mechanism including a first locking component and a second locking component, wherein the second locking component is hinged to one side of the first locking component.

[0008] In a preferred embodiment of the flue gas filtration device of the present invention, the main filter tube includes a first fixed flange, an upper fixed plate, a middle fixed plate and a lower fixed plate, wherein the first fixed flange is fixed above the upper fixed plate, the middle fixed plate is fixed below the upper fixed plate and the lower fixed plate is fixed below the middle fixed plate.

[0009] In a preferred embodiment of the flue gas filtration device of the present invention, a first filter plate hole and a second filter plate hole are further provided on the inner surface of the main filter tube opposite to the upper fixed plate. The second filter plate hole is located below the first filter plate hole. A first filter plate is slidably disposed in the first filter plate hole, and a second filter plate is slidably disposed in the second filter plate hole.

[0010] In a preferred embodiment of the flue gas filtration device of the present invention, the auxiliary filter tube includes a second fixed flange and a tapered tube, wherein the second fixed flange is fixed below the tapered tube.

[0011] In a preferred embodiment of the flue gas filtration device of the present invention, the first locking assembly includes a first lock seat, a first locking rod, a second locking rod, and a lock head. The first locking rod is hinged to the bottom of the first lock seat, the second locking rod is slidably disposed on one side of the first locking rod, and the lock head is hinged to one side of the second locking rod. The first lock seat has a first hinge hole. The first locking rod includes a first hinge post, a first connecting rod, and a handle rod. The first connecting rod is fixed to one side of the first hinge post, and the handle rod is fixed to the other side of the first connecting rod. The first locking rod also has a second hinge hole, and the first hinge post is rotatably connected to the first hinge hole. The second locking rod includes a second hinge post, a telescopic post, and a telescopic spring. The telescopic post is fixed to one side of the second hinge post, and the telescopic spring is located outside the telescopic post.

[0012] In a preferred embodiment of the flue gas filtration device of the present invention, the second locking rod further includes a telescopic seat and a third hinge column, the third hinge column being fixed to one side of the telescopic seat; the telescopic seat has a telescopic hole, the telescopic hole being rotatably connected to the telescopic column; the lock head includes a first pressure block and a second pressure block, the second pressure block being fixed to both sides of the first pressure block, the first pressure block having a third hinge hole, the third hinge hole being rotatably connected to the third hinge column.

[0013] In a preferred embodiment of the flue gas filtration device of the present invention, the second locking component includes a third locking rod and a second locking seat, wherein the third locking rod is slidably disposed on one side of the second locking seat; the third locking rod includes a second connecting rod, a third connecting rod, a pressure seat and an adaptation block, wherein the second connecting rod and the third connecting rod are fixed on both sides of the pressure seat and the adaptation block is slidably disposed on one side of the pressure seat.

[0014] In a preferred embodiment of the flue gas filtration device of the present invention: a fourth hinge hole is provided on the second connecting rod, and the fourth hinge hole is rotatably connected to the third hinge post; a locking post is fixed on one side of the third connecting rod; a ball cavity is provided on one side of the pressure seat; the adapting block includes a ball block and an adapting plate, the adapting plate is fixed on the ball block, and the ball block is rotatably disposed in the ball cavity.

[0015] In a preferred embodiment of the flue gas filtration device of the present invention, the second lock seat includes a lock seat block, a locking block, a lock block, a lock housing, and a locking spring. The locking block is slidably disposed in the lock seat block, the lock block is slidably disposed below the locking block, the lock block is slidably disposed in the lock housing, and the locking spring is fixed in the lock housing. The lock seat block has a first lock hole and a second lock hole, the second lock hole is located on one side of the first lock hole, and the first lock hole is slidably connected to the locking pin.

[0016] The beneficial effects of the present invention are as follows: The flue gas filtration device of the present invention, through the cooperation of the flue pipe mechanism and the locking mechanism, can adapt to the expansion of different filter plates according to temperature changes. Attached Figure Description

[0017] To more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort. Wherein:

[0018] Figure 1 This is a schematic diagram of the overall structure of the flue gas filtration device.

[0019] Figure 2 This is a part drawing of the smoke pipe mechanism;

[0020] Figure 3 This is a schematic diagram of the locking mechanism;

[0021] Figure 4 This is a schematic diagram of the structure of the first locking component;

[0022] Figure 5 A cross-sectional view of the first locking component;

[0023] Figure 6 This is a schematic diagram of the structure of the second locking component;

[0024] Figure 7 A cross-sectional view of the second locking component;

[0025] Figure 8 This is a schematic diagram of the lock seat block. Detailed Implementation

[0026] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0027] Many specific details are set forth in the following description in order to provide a full understanding of the invention. However, the invention may also be practiced in other ways different from those described herein, and those skilled in the art can make similar extensions without departing from the spirit of the invention. Therefore, the invention is not limited to the specific embodiments disclosed below.

[0028] Secondly, the term "one embodiment" or "embodiment" as used herein refers to a specific feature, structure, or characteristic that may be included in at least one implementation of the present invention. The phrase "in one embodiment" appearing in different places in this specification does not necessarily refer to the same embodiment, nor is it a single or selective embodiment that is mutually exclusive with other embodiments.

[0029] Example 1

[0030] Reference Figures 1-3 This is the first embodiment of the present invention. This embodiment provides a flue gas filtration device, specifically including a flue mechanism 100, which includes a main filter tube 101 and a secondary filter tube 102, the secondary filter tube 102 being fixed below the main filter tube 101; and a locking mechanism 200, which includes a first locking component 201 and a second locking component 202, the second locking component 202 being hinged to one side of the first locking component 201.

[0031] Furthermore, the main filter pipe 101 includes a first fixed flange 101a, an upper fixed plate 101b, a middle fixed plate 101c, and a lower fixed plate 101d. The first fixed flange 101a is fixed above the upper fixed plate 101b, the middle fixed plate 101c is fixed below the upper fixed plate 101b, and the lower fixed plate 101d is fixed below the middle fixed plate 101c.

[0032] It should be noted that the first fixed flange 101a is a square flange with multiple bolt holes for bolting the economizer; the upper fixed plate 101b, the middle fixed plate 101c, and the lower fixed plate 101d are all cuboid plates, and are fixed to the inner wall of the main filter tube 101; a first filter plate 101b-3 is slidably disposed between the upper fixed plate 101b and the middle fixed plate 101c, and a second filter plate 101b-4 is slidably disposed between the middle fixed plate 101c and the lower fixed plate 101d.

[0033] Preferably, the inner surface of the main filter tube 101 is provided with a first filter plate hole 101b-1 and a second filter plate hole 101b-2 on the side opposite to the upper fixed plate 101b. The second filter plate hole 101b-2 is located below the first filter plate hole 101b-1. A first filter plate 101b-3 is slidably disposed in the first filter plate hole 101b-1, and a second filter plate 101b-4 is slidably disposed in the second filter plate hole 101b-2. The auxiliary filter tube 102 includes a second fixed flange 102a and a tapered tube 102b. The second fixed flange 102a is fixed below the tapered tube 102b.

[0034] It should be noted that the first filter plate hole 101b-1 and the second filter plate hole 101b-2 are square holes. The size of the first filter plate hole 101b-1 is adapted to the first filter plate 101b-3, and the size of the second filter plate hole 101b-2 is adapted to the second filter plate 101b-4. The second fixed flange 102a is a square flange, and bolt holes are opened on the second fixed flange 102a for bolting the boiler flue gas output pipe.

[0035] In this embodiment, flue gas can be filtered through the main filter tube 101 and the auxiliary filter tube 102. The operator can fix the first filter plate 101b-3 and the second filter plate 101b-4 through the first locking component 201 and the second locking component 202, and can easily disassemble them through the first locking component 201 and the second locking component 202 when it is necessary to clean the first filter plate 101b-3 and the second filter plate 101b-4.

[0036] Example 2

[0037] Reference Figures 1-8 This is the second embodiment of the present invention, which is based on the previous embodiment.

[0038] Specifically, the first locking assembly 201 includes a first lock seat 201a, a first locking rod 201b, a second locking rod 201c, and a lock head 201d. The first locking rod 201b is hinged to the bottom of the first lock seat 201a, the second locking rod 201c is slidably disposed on one side of the first locking rod 201b, and the lock head 201d is hinged to one side of the second locking rod 201c. The first locking rod 201b includes a first hinge pin 201b-1, a first connecting rod 201b-2, and a handle 201b-3. The first connecting rod 201b-2 is fixed to one side of the first hinge pin 201b-1, and the handle 201b-3 is fixed to the other side of the first connecting rod 201b-2. The first locking rod 201b also has a second hinge hole 201b-4, and the first hinge pin 201b-1 is rotatably connected to the first hinge hole 201a-1.

[0039] The second locking rod 201c includes a second hinge post 201c-1, a telescopic post 201c-2, and a telescopic spring 201c-3. The telescopic post 201c-2 is fixed to one side of the second hinge post 201c-1, and the telescopic spring 201c-3 is located outside the telescopic post 201c-2. The second locking rod 201c also includes a telescopic seat 201c-4 and a third hinge post 201c-5. The third hinge post 201c-5 is fixed to one side of the telescopic seat 201c-4. The base 201c-4 has a telescopic hole 201c-4a, which is rotatably connected to the telescopic column 201c-2; the lock head 201d includes a first pressure block 201d-1 and a second pressure block 201d-2, the second pressure block 201d-2 is fixed on both sides of the first pressure block 201d-1, and the first pressure block 201d-1 has a third hinge hole 201d-3, which is rotatably connected to the third hinge column 201c-5.

[0040] It should be noted that the first locking seat 201a is a cuboid, and one end of the first locking seat 201a is fixed on the circular surface of the stirring cylinder 101b-1, located above the filter plate hole 101b-1e; the first locking rod 201b is hinged to the first locking seat 201a; the second locking rod 201c is slidably connected to the first locking rod 201b; the locking head 201d is hinged to the second locking rod 201c; the telescopic seat 201c-4 is columnar, and the telescopic seat 201c-4 is slidably connected to the first locking rod 201b; the third hinge post 201c-5 is fixed on one side of the telescopic seat 201c-4; the telescopic hole 201c-4a is a round hole; the first pressure block 201d-1 is a square block, and two second pressure blocks 201d-2 are fixed on both sides of the first pressure block 201d-1; the third hinge hole 201d-3 is a round hole, and the third hinge hole 201d-3 is slidably connected to the third hinge post 201c-5.

[0041] Furthermore, the second locking assembly 202 includes a third locking rod 202a and a second locking seat 202b, with the third locking rod 202a slidably disposed on one side of the second locking seat 202b; the third locking rod 202a includes a second connecting rod 202a-1, a third connecting rod 202a-2, a pressure seat 202a-3 and an adaptation block 202a-4, with the second connecting rod 202a-1 and the third connecting rod 202a-2 fixed on both sides of the pressure seat 202a-3, and the adaptation block 202a-4 slidably disposed on one side of the pressure seat 202a-3.

[0042] It should be noted that the third locking rod 202a and the second locking seat 202b are slidably connected; the pressure seat 202a-3 is square in appearance, and the second connecting rod 202a-1 and the third connecting rod 202a-2 are fixed on both sides of the pressure seat 202a-3 respectively; the adapting block 202a-4 is slidably connected to the pressure seat 202a-3; the second connecting rod 202a-1 and the third connecting rod 202a-2 are rectangular straight rods, and there are two of each of the second connecting rod 202a-1 and the third connecting rod 202a-2.

[0043] Preferably, the second connecting rod 202a-1 has a fourth hinge hole 202a-5, which is rotatably connected to the third hinge post 201c-5; a locking post 202a-6 is fixed on one side of the third connecting rod 202a-2; a ball cavity 202a-7 is opened on one side of the pressure seat 202a-3; the adapting block 202a-4 includes a ball block 202a-4a and an adapting plate 202a-4b, the adapting plate 202a-4b is fixed on the ball block 202a-4a, and the ball block 202a-4a is rotatably disposed in the ball cavity 202a-7.

[0044] It should be noted that the first hinge hole 201a-1 is a round hole, and the first hinge hole 201a-1 is slidably connected to the first hinge post 201b-1; the first connecting rod 201b-2 is a rectangular straight rod, one end of the first connecting rod 201b-2 is fixed to the first hinge post 201b-1, and the other end is fixed to the handle 201b-3; the second hinge hole 201b-4 is a round hole, and the second hinge hole 201b-4 is slidably connected to the second hinge post 201c-1; the second hinge post 201c-1 is a cylinder; the telescopic post 201c-2 is a cylinder, and one end of the telescopic post 201c-2 is fixed to the second hinge post. Side view of 201c-1; one end of the telescopic spring 201c-3 is fixed to the telescopic seat 201c-4, and the other end is fixed to the second hinge post 201c-1; the fourth hinge hole 202a-5 is a round hole, and the fourth hinge hole 202a-5 is slidably connected to the third hinge post 201c-5; the locking post 202a-6 is a cylinder; the locking post 202a-6 is located in the first locking hole 202b-1a; the ball cavity 202a-7 is slidably connected to the ball block 202a-4a; an adaptation plate 202a-4b is fixed on one side of the ball block 202a-4a; the adaptation plate 202a-4b is a cuboid plate.

[0045] Furthermore, the second lock seat 202b includes a lock seat block 202b-1, a locking block 202b-2, a locking block 202b-3, a lock housing 202b-4, and a locking spring 202b-5. The locking block 202b-2 is slidably disposed in the lock seat block 202b-1, the locking block 202b-3 is slidably disposed below the locking block 202b-2, the locking block 202b-3 is slidably disposed in the lock housing 202b-4, and the locking spring 202b-5 is fixed in the lock housing 202b-4. The lock seat block 202b-1 has a first lock hole 202b-1a and a second lock hole 202b-1b. The second lock hole 202b-1b is located on one side of the first lock hole 202b-1a, and the first lock hole 202b-1a is slidably connected to the locking pin 202a-6.

[0046] It should be noted that the locking spring 202b-5 is fixed in the lock housing 202b-4 and is used for the ejection of the locking block 202b-3; the first locking hole 202b-1a is a square hole, and the second locking holes 202b-1b are opened on both sides of the first locking hole 202b-1a; the second locking holes 202b-1b are square holes; the first locking hole 202b-1a is slidably connected to the locking block 202b-2, and the second locking hole 202b-1b is slidably connected to the locking block 202b-3; the locking block 202b-2 is a square block, and the locking block 202b-2 is slidably connected to the locking block 202b-3, and the locking block 202b-3 is slidably connected to the lock housing 202b-4; one end of the locking spring 202b-5 is fixed in the lock housing 202b-4, and the other end is fixed on the locking block 202b-3; the locking pin 202a-6 is located in the middle of the first locking hole 202b-1a.

[0047] In this embodiment, when the operator needs to fix the first filter plate 101b-3 and the second filter plate 101b-4, the first filter plate 101b-3 and the second filter plate 101b-4 must first be inserted into the first filter plate hole 101b-1 and the second filter plate hole 101b-2. Then, one hand holds the handle 201b-3 and the other hand holds the first pressure block 201d-1, and the first pressure block 201d-1 is pulled to retract the telescopic column 201c-2 into the telescopic hole 201c-4a until the first filter plate 101b-3 is fixed in place. 3 can be inserted into the concave groove formed by the first pressure block 201d-1 and the second pressure block 201d-2. After the concave groove formed by the first pressure block 201d-1 and the second pressure block 201d-2 covers the first filter plate 101b-3, the operator needs to hold the pressure base 202a-3 and rotate the locking pin 202a-6 around the fourth hinge hole 202a-5 into the first locking hole 202b-1a; the operator can then insert the locking block 202b-2 and lock the locking block 202b-2 through the locking block 202b-3.

[0048] It should be noted that, since the flue gas temperature is transferred from the first filter plate 101b-3 to the second filter plate 101b-4, the temperature of the first filter plate 101b-3 is higher than that of the second filter plate 101b-4, and the expansion of the first filter plate 101b-3 is greater than that of the second filter plate 101b-4. When the operator completes the fixing of the clamping column 202a-6 and the flue gas flows, the temperature of the first filter plate 101b-3 will also rise. After the temperature of the first filter plate 101b-3 rises, its volume expands, causing the first filter plate 101b-3 to push the first pressure block 20. 1d-1, at this time, the telescopic column 201c-2 will retract into the telescopic hole 201c-4a, and the telescopic spring 201c-3 will be compressed; at the same time, the fourth hinge hole 202a-5 will also drive the third locking rod 202a to move outward under the push of the third hinge column 201c-5, and cause the locking column 202a-6 to move from the middle of the first locking hole 202b-1a to a position close to the second locking hole 202b-1b. Therefore, the second filter plate 101b-4 also has a larger range of motion, and can ensure that the range of motion of the second filter plate 101b-4 is smaller than the expansion size of the first filter plate 101b-3.

[0049] It should be understood that numerous specific implementation decisions can be made during the development of any practical implementation, such as in any engineering or design project. Such development efforts may be complex and time-consuming, but for those skilled in the art who benefit from this disclosure, the development effort will be a routine work of design, manufacturing, and production without requiring much experimentation.

[0050] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all such modifications or substitutions should be covered within the scope of the claims of the present invention.

Claims

1. A flue gas filtration device, characterized in that: include, The smoke pipe mechanism (100) includes a main filter pipe (101) and a secondary filter pipe (102), wherein the secondary filter pipe (102) is fixed to the main filter pipe. (101) Below; The locking mechanism (200) includes a first locking component (201) and a second locking component (202), wherein the second locking component (202) is hinged to one side of the first locking component (201), and the first locking component (201) is fixed to one side of the main filter tube (101); The main filter tube (101) includes a first fixed flange (101a), an upper fixed plate (101b), a middle fixed plate (101c), and a lower fixed plate (101d). The first fixed flange (101a) is fixed above the upper fixed plate (101b), the middle fixed plate (101c) is fixed below the upper fixed plate (101b), and the lower fixed plate (101d) is fixed below the middle fixed plate (101c). The inner surface of the main filter tube (101) is provided with a first filter plate hole (101b_1) and a second filter plate hole (101b_2) on the side opposite to the upper fixed plate (101b). The second filter plate hole (101b_2) is located below the first filter plate hole (101b_1). A first filter plate (101b_3) is slidably disposed in the first filter plate hole (101b_1), and a second filter plate (101b_4) is slidably disposed in the second filter plate hole (101b_2). The first locking assembly (201) includes a first lock seat (201a), a first lock rod (201b), a second lock rod (201c), and a lock head (201d). The first lock rod (201b) is hinged to the bottom of the first lock seat (201a), the second lock rod (201c) is slidably disposed on one side of the first lock rod (201b), and the lock head (201d) is hinged to one side of the second lock rod (201c). The first lock seat (201a) has a first hinge hole (201a_1); The first locking rod (201b) includes a first hinge post (201b_1), a first connecting rod (201b_2), and a handle (201b_3). The first connecting rod (201b_2) is fixed to one side of the first hinge post (201b_1), and the handle (201b_3) is fixed to the other side of the first connecting rod (201b_2). The first locking rod (201b) also has a second hinge hole (201b_4), and the first hinge post (201b_1) is rotatably disposed in the first hinge hole (201a_1). The second locking rod (201c) includes a second hinge post (201c_1), a telescopic post (201c_2), and a telescopic spring (201c_3). The telescopic post (201c_2) is fixed to one side of the second hinge post (201c_1), and the telescopic spring (201c_3) is located outside the telescopic post (201c_2). The second locking rod (201c) also includes a telescopic seat (201c_4) and a third hinge post (201c_5), wherein the third hinge post (201c_5) is fixed to one side of the telescopic seat (201c_4); The telescopic seat (201c_4) has a telescopic hole (201c_4a), and the telescopic column (201c_2) is rotatably disposed in the telescopic hole (201c_4a); The lock head (201d) includes a first pressure block (201d_1) and a second pressure block (201d_2). The second pressure block (201d_2) is fixed on both sides of the first pressure block (201d_1). A third hinge hole (201d_3) is opened on the first pressure block (201d_1). The third hinge hole (201d_3) is rotatably connected to a third hinge pin (201c_5). The first locking component (201) and the second locking component (202) fix the first filter plate (101b_3) and the second filter plate (101b_4); The flue mechanism (100) and the locking mechanism (200) work together to adapt to the expansion of different filter plates according to temperature changes.

2. The flue gas filtration device according to claim 1, characterized in that: The secondary filter tube (102) includes a second fixed flange (102a) and a tapered tube (102b), with the second fixed flange (102a) fixed below the tapered tube (102b). 。 3. The flue gas filtration device according to claim 2, characterized in that: The second locking assembly (202) includes a third locking rod (202a) and a second locking seat (202b). The third locking rod (202a) is slidably disposed on one side of the second locking seat (202b). The third locking rod (202a) includes a second connecting rod (202a_1), a third connecting rod (202a_2), a pressure seat (202a_3), and an adaptation block (202a_4). The second connecting rod (202a_1) and the third connecting rod (202a_2) are fixed on both sides of the pressure seat (202a_3), and the adaptation block (202a_4) is slidably disposed on one side of the pressure seat (202a_3). 。 4. The flue gas filtration device according to claim 3, characterized in that: The second connecting rod (202a_1) has a fourth hinge hole (202a_5), and the third hinge pin (201c_5) is rotatably disposed in the fourth hinge hole (202a_5); A locking post (202a_6) is fixed on one side of the third connecting rod (202a_2); A spherical cavity (202a_7) is opened on one side of the pressure seat (202a_3); The adaptation block (202a_4) includes a ball block (202a_4a) and an adaptation plate (202a_4b). The adaptation plate (202a_4b) is fixed on the ball block (202a_4a), and the ball block (202a_4a) is rotatably disposed in the ball cavity (202a_7).

5. The flue gas filtration device according to claim 4, characterized in that: The second lock base (202b) includes a lock base block (202b_1), a locking block (202b_2), a locking block (202b_3), a lock housing (202b_4), and a locking spring (202b_5). The locking block (202b_2) is slidably disposed in the lock base block (202b_1), the locking block (202b_3) is slidably disposed below the locking block (202b_2), the locking block (202b_3) is slidably disposed in the lock housing (202b_4), and the locking spring (202b_5) is fixed in the lock housing (202b_4).

6. The flue gas filtration device according to claim 5, characterized in that: The lock base block (202b_1) has a first lock hole (202b_1a) and a second lock hole (202b_1b), the second lock hole (202b_1b) is located on one side of the first lock hole (202b_1a), and the locking pin (202a_6) is slidably disposed in the first lock hole (202b_1a).

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