Flue gas sampling device and method for preventing pipeline blockage

Abstract

The invention discloses a flue gas sampling device and method for preventing pipeline blockage, and relates to the technical field of flue gas sampling, the flue gas sampling device comprises a sampling pipe, the inner side wall of the sampling pipe is provided with a first partition plate and a second partition plate, the side wall of the first partition plate is provided with a second one-way valve, and the outer side wall of the second partition plate is provided with a fourth one-way valve; the first piston is arranged on the inner side wall of the sampling tube in a sliding manner. Gas in a gas storage tank can enter a sleeve through an electromagnetic valve and a gas conveying pipe, a second piston is pushed to move, then a sleeve rod is driven to move, the sleeve rod abuts against a transmission plate in the moving process, then a connecting plate is driven to move, and the connecting plate moves to drive a sealing plate to move through a sealing plate to seal a baffle. The high-pressure gas is output through the round hole in the sleeve, so that the air pressure between the baffle and the filter screen in the sampling pipe is increased, impurities on the filter screen are flushed out by utilizing the air pressure of the fixed plate, and the device is prevented from being blocked.

Description

Technical Field

[0001] The invention relates to the technical field of smoke sampling, and in particular to a smoke sampling device and method for preventing pipeline blockage. Background Art

[0002] Pollutant blockage in flue is a complex and important issue, which is directly related to the operating efficiency, environmental emissions and equipment safety of coal-fired facilities. Pollutants generated during coal combustion mainly include smoke, sulfur dioxide (SO2), nitrogen oxides (NOx), carbon monoxide (CO) and unburned carbon particles. When these pollutants flow in the flue, they may be deposited, condensed or chemically reacted due to changes in temperature, humidity, flow rate and other factors, resulting in blockage.

[0003] During the sampling process of pollutants in the flue, the sampling port of the sampling device needs to be inserted deep into the flue, and the gas inside the flue is extracted under the action of negative pressure to perform gas sampling. However, the flue usually contains a large amount of dust. In order to avoid clogging of the sampling device, a flue gas sampling device is needed to prevent pipeline clogging.

[0004] In the prior art, when the sampling device is blocked, the sampling work must be terminated, and the sampling device needs to be taken out of the flue and cleaned before the sampling work can be continued, which affects the efficiency of the sampling work. Summary of the invention

[0005] The purpose of the present invention is to provide a smoke sampling device and method for preventing pipeline blockage, so as to solve the technical problems in the prior art.

[0006] In order to achieve the above object, the present invention adopts the following technical solution: A flue gas sampling device for preventing pipeline blockage, comprising: A sampling tube, wherein the inner wall of the sampling tube is provided with a first partition and a second partition, the side wall of the first partition is provided with a second one-way valve, and the outer wall of the second partition is provided with a fourth one-way valve; A first piston, which is slidably disposed on the inner wall of the sampling tube and is located between the first partition plate and the second partition plate; A power assembly, which is arranged on the outer side wall of the sampling tube and is used to drive the first piston to move back and forth; A storage component, which is arranged on the outer side wall of the sampling tube and is used to store high-pressure gas; A one-way component, which is arranged at the end of the inner wall of the sampling tube; The sleeve is arranged at the bottom of the inner wall of the sampling tube and is close to the one-way component. A plurality of circular holes distributed at equal distances are opened at the end of the outer wall of the sleeve, and the sleeve is connected to the storage component; a second piston, the second piston being slidably disposed on the inner wall of the sleeve; A second spring, one end of which is arranged on the inner wall of the sleeve, and the other end of which is fixed to the second piston; The sleeve rod is arranged on the side wall of the second piston, and the sleeve rod is in conflict with the one-way component.

[0007] A further improvement of the present invention is that the power assembly comprises: A motor, which is arranged on the outer side wall of the sampling tube; A turntable, which is arranged on the output shaft of the motor and is located in the sampling tube; A transmission rod, the transmission rod slidably penetrates the outer side wall of the second partition plate, and the transmission rod and the first piston are fixed; A connecting rod, one end of which is rotatably arranged at an eccentric position of a side wall of the turntable, and the other end of which is rotatably connected to a transmission rod.

[0008] A further improvement of the present invention is that it also includes: An output pipe, which is arranged on the outer side wall of the sampling tube and is located between the first partition plate and the first piston; The connecting pipe is arranged on the outer side wall of the sampling tube through the connecting pipe, and the connecting pipe is located between the first piston and the second partition plate.

[0009] A further improvement of the present invention is that a first one-way valve is provided at the end of the output pipe, and a third one-way valve is provided at the end of the connecting pipe.

[0010] A further improvement of the present invention is that the storage assembly comprises: A gas storage tank, which is arranged on the outer side wall of the sampling tube and is connected to the connecting pipe; Self-operated pressure regulating valve, which is installed on the outer wall of the gas storage tank; A solenoid valve, which is arranged on the outer side wall of the gas storage tank; An air delivery pipe, one end of which is connected to the sleeve, and the other end of which is connected to the solenoid valve.

[0011] A further improvement of the present invention is that the one-way component comprises: A baffle, the baffle is arranged on the inner wall of the sampling tube, and a plurality of through holes distributed at equal distances are opened on the outer wall of the baffle; A fixing rod, the fixing rod is arranged through the outer side wall of the baffle; A sealing plate, which is arranged at the end of the fixing rod and is used to seal the through hole; A connecting plate is arranged at the end of the fixing rod, a first spring is arranged on a side wall of the connecting plate, and the first spring is fixed to the baffle.

[0012] A further improvement of the present invention is that it also includes: A transmission plate is arranged on a side wall of the connecting plate.

[0013] A further improvement of the present invention is that it also includes: A fixing plate and a fixing sleeve of the fixing plate are arranged on the outer side wall of the sampling tube.

[0014] A further improvement of the present invention is that it also includes: The filter screen is arranged at the end of the sampling tube.

[0015] A flue gas sampling method for preventing pipeline blockage, based on the flue gas sampling device for preventing pipeline blockage, comprises: The power assembly drives the first piston to move back and forth, and through the second one-way valve on the first baffle, the gas between the first baffle and the one-way assembly enters the sampling tube between the first baffle and the first piston, thereby causing the air pressure between the first baffle and the one-way assembly to decrease, thereby causing the gas in the sampling pipeline to enter the sampling tube, and then enter the sampling tube through the through hole on the one-way assembly to enter the space between the first baffle and the one-way assembly, and then enter the sampling tube through the second one-way valve to enter the space between the first baffle and the first piston, and finally sample the output flue gas; At the same time, during the movement of the first piston, the external gas enters the sampling tube through the fourth one-way valve on the second partition and is stored between the first piston and the second partition.

[0016] Compared with the prior art, the present invention has at least the following beneficial technical effects: The present invention provides a flue gas sampling device and method for preventing pipeline blockage. After the sampling tube is blocked, the present invention can allow the gas in the storage component to enter the sleeve, push the second piston to move, and then drive the sleeve rod to move. During the movement of the sleeve rod, the one-way component is driven to work, and the high-pressure gas is then output through the circular hole on the sleeve, thereby achieving a self-cleaning effect of the sampling tube and avoiding blockage of the device. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0018] Figure 1 It is a three-dimensional structural schematic diagram of the present invention; Figure 2 It is a schematic diagram of the sampling tube and filter structure of the present invention; Figure 3It is a schematic diagram of the cross-sectional structure of the sampling tube of the present invention; Figure 4 It is a schematic diagram of the structure of the gas storage tank and the connecting pipe of the present invention; Figure 5 It is a schematic diagram of the structure of the baffle and the sealing plate of the present invention; Figure 6 It is a schematic diagram of the cross-sectional structure of the sleeve of the present invention.

[0019] Description of reference numerals: 1. Sampling tube; 2. Sealing plate; 3. Output pipe; 4. Gas storage tank; 5. Solenoid valve; 6. Gas pipe; 7. Filter; 8. Sleeve; 9. Baffle; 10. First baffle; 11. Second baffle; 12. Piston; 13. First one-way valve; 14. Second one-way valve; 15. Transmission rod; 16. Third one-way valve; 17. Fourth one-way valve; 18. Turntable; 19. Connecting rod; 20. Motor; 21. Connecting pipe; 22. Self-operated pressure regulating valve; 23. Sleeve rod; 24. Transmission plate; 25. Connecting plate; 26. First spring; 27. Fixed rod; 28. Sealing plate; 29. ​​Piston; 30. Second spring. DETAILED DESCRIPTION

[0020] In the following, only some exemplary embodiments are briefly described. As those skilled in the art will appreciate, the described embodiments may be modified in various ways without departing from the spirit or scope of the present invention. Therefore, the drawings and descriptions are considered to be exemplary and non-restrictive in nature.

[0021] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0022] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0023] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, an electrical connection, or a communication; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0024] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0025] It should be understood that when used in this specification and the appended claims, the terms "include" and "comprises" indicate the presence of described features, integers, steps, operations, elements and / or components, but do not exclude the presence or addition of one or more other features, integers, steps, operations, elements, components and / or combinations thereof.

[0026] It should also be understood that the terms used in the present specification are only for the purpose of describing specific embodiments and are not intended to limit the present invention. As used in the present specification and the appended claims, unless the context clearly indicates otherwise, the singular forms "a", "an" and "the" are intended to include plural forms.

[0027] It should be further understood that the term "and / or" used in the present description and the appended claims refers to any and all possible combinations of one or more of the associated listed items, and includes these combinations.

[0028] Various structural schematic diagrams of the embodiments disclosed in the present invention are shown in the accompanying drawings. These figures are not drawn to scale, and some details are magnified and some details may be omitted for the purpose of clear expression. The shapes of various regions and layers shown in the figures and the relative sizes and positional relationships therebetween are only exemplary, and may deviate in practice due to manufacturing tolerances or technical limitations, and those skilled in the art may additionally design regions / layers with different shapes, sizes, and relative positions according to actual needs.

[0029] The embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0030] Example 1 like Figures 1 to 6 As shown, this embodiment provides a smoke sampling device for preventing pipeline blockage, comprising: A sampling tube 1, wherein the inner wall of the sampling tube 1 is provided with a first partition plate 10 and a second partition plate 11, a side wall of the first partition plate 10 is provided with a second one-way valve 14, and an outer wall of the second partition plate 11 is provided with a fourth one-way valve 17; A first piston 12, which is slidably disposed on the inner wall of the sampling tube 1, and is located between the first partition plate 10 and the second partition plate 11; A power assembly, which is arranged on the outer wall of the sampling tube 1 and is used to drive the first piston 12 to move back and forth; A storage component, which is arranged on the outer side wall of the sampling tube 1 and is used to store high-pressure gas; A one-way component, which is arranged at the end of the inner wall of the sampling tube 1; The sleeve 8 is arranged at the bottom of the inner wall of the sampling tube 1, and the sleeve 8 is close to the one-way component. The end of the outer wall of the sleeve 8 is provided with a plurality of circular holes distributed at equal distances, and the sleeve 8 is connected with the storage component; A second piston 29, which is slidably disposed on the inner wall of the sleeve 8; A second spring 30, one end of the second spring 30 is arranged on the inner wall of the sleeve 8, and the other end of the second spring 30 is fixed to the second piston 29; The sleeve rod 23 is arranged on the side wall of the second piston 29, and the sleeve rod 23 conflicts with the one-way component.

[0031] Furthermore, the power assembly includes: A motor 20, wherein the motor 20 is arranged on the outer side wall of the sampling tube 1; A turntable 18, which is disposed on an output shaft of a motor 20 and is located in the sampling tube 1; A transmission rod 15, the transmission rod 15 slides through the outer wall of the second partition plate 11, and the transmission rod 15 and the first piston 12 are fixed; The connecting rod 19 has one end rotatably arranged at the eccentric position of the side wall of the rotating disk 18 , and the other end of the connecting rod 19 is rotatably connected to the transmission rod 15 .

[0032] Furthermore, it also includes: An output pipe 3, which is disposed on the outer wall of the sampling tube 1 and is located between the first partition plate 10 and the first piston 12; A first one-way valve 13, which is arranged at the end of the output pipe 3; The connecting pipe 21 is provided through the outer wall of the sampling tube 1 , and the connecting pipe 21 is located between the first piston 12 and the second partition plate 11 . A third one-way valve 16 is provided at the end of the connecting pipe 21 .

[0033] Further, the storage component includes: The gas storage tank 4 is arranged on the outer wall of the sampling tube 1, and the gas storage tank 4 is connected with the connecting pipe 21; A self-operated pressure regulating valve 22, which is disposed on the outer side wall of the gas storage tank 4; Solenoid valve 5, solenoid valve 5 is arranged on the outer side wall of gas storage tank 4; The gas delivery pipe 6 has one end connected to the sleeve 8 and the other end connected to the solenoid valve 5 .

[0034] Furthermore, the one-way component includes: The baffle plate 9 is arranged on the inner wall of the sampling tube 1, and the outer wall of the baffle plate 9 is provided with a plurality of through holes distributed at equal distances; A fixing rod 27, the fixing rod 27 is arranged on the outer side wall of the baffle 9 through the fixing rod 27; A sealing plate 28, which is disposed at the end of the fixing rod 27 and is used to seal the through hole; The connecting plate 25 is arranged at the end of the fixing rod 27 , and a first spring 26 is arranged on the side wall of the connecting plate 25 , and the first spring 26 and the baffle 9 are fixed.

[0035] Furthermore, it also includes: The transmission plate 24 is arranged on the side wall of the connecting plate 25 .

[0036] Furthermore, it also includes: A fixing plate 2, the fixing plate 2 is fixedly sleeved on the outer side wall of the sampling tube 1; The filter screen 7 is arranged at the end of the sampling tube 1 .

[0037] Example 2 like Figures 1 to 6 As shown, this embodiment provides a flue gas sampling method for preventing pipeline blockage, comprising: The power assembly drives the first piston 12 to move back and forth, and through the second one-way valve 14 on the first partition 10, the gas between the first partition 10 and the one-way assembly enters the sampling tube 1 between the first partition 10 and the first piston 12, thereby causing the air pressure between the first partition 10 and the one-way assembly to decrease, thereby causing the gas in the sampling pipeline to enter the sampling tube 1, and then enter the sampling tube 1 through the through hole on the one-way assembly to the space between the first partition 10 and the one-way assembly, and then enter the sampling tube 1 through the second one-way valve 14 to the space between the first partition 10 and the first piston 12, and finally the output flue gas is sampled; At the same time, during the movement of the first piston 12, the external gas enters the sampling tube 1 through the fourth one-way valve 17 on the second partition plate 11 and is stored between the first piston 12 and the second partition plate 11.

[0038] Example 3 like Figures 1 to 6 As shown, this embodiment provides a flue gas sampling method for preventing pipeline blockage, comprising: The power assembly drives the first piston 12 to move back and forth, and through the second one-way valve 14 on the first partition 10, the gas between the first partition 10 and the one-way assembly enters the sampling tube 1 between the first partition 10 and the first piston 12, thereby causing the air pressure between the first partition 10 and the one-way assembly to decrease, thereby causing the gas in the sampling pipeline to enter the sampling tube 1, and then enter the sampling tube 1 through the through hole on the one-way assembly to the space between the first partition 10 and the one-way assembly, and then enter the sampling tube 1 through the second one-way valve 14 to the space between the first partition 10 and the first piston 12, and finally the output flue gas is sampled; At the same time, during the movement of the first piston 12, the external gas enters the sampling tube 1 through the fourth one-way valve 17 on the second partition plate 11 and is stored between the first piston 12 and the second partition plate 11.

[0039] In this embodiment, more specifically, when in use, firstly, the device is fixed at the sampling location of the pipeline by the fixing plate 2, and the filter screen 7 is sent into the pipeline; During the sampling process, the switch of the motor 20 is turned on. During the operation of the motor 20, the turntable 18 is driven to rotate. Under the action of the connecting rod 19, the transmission rod 15 is reciprocated, thereby driving the first piston 12 to reciprocate. During the reciprocating motion of the first piston 12, the gas between the first partition 10 and the baffle 9 enters the sampling tube 1 between the first partition 10 and the first piston 12 through the second one-way valve 14 on the first partition 10, thereby causing the air pressure between the first partition 10 and the baffle 9 to decrease, so that the gas in the sampling pipeline enters the sampling tube 1 through the filter 7, and then enters the sampling tube 1 between the first partition 10 and the baffle 9 through the through hole on the baffle 9, and then enters the sampling tube 1 between the first partition 10 and the first piston 12 through the second one-way valve 14, and finally outputs through the first one-way valve 13 and the output pipe 3, and the flue gas output from the output pipe 3 is sampled; At the same time, during the movement of the first piston 12, the external gas enters the sampling tube 1 between the first piston 12 and the second partition 11 through the fourth one-way valve 17 on the second partition 11, and then enters the gas storage tank 4 through the third one-way valve 16 and the connecting pipe 21 to be stored. Under the action of the self-operated pressure regulating valve 22, the gas pressure in the gas storage tank 4 will not be too high. When the sampling tube 1 is blocked, the switch of the solenoid valve 5 is turned on, and the gas in the gas storage tank 4 enters the sleeve 8 through the solenoid valve 5 and the gas pipe 6, pushing the second piston 29 to move, thereby driving the sleeve rod 23 to move. During the movement of the sleeve rod 23, it contacts the transmission plate 24, thereby driving the connecting plate 25 to move. The connecting plate 25 moves through the sealing plate 28 to drive the sealing plate 28 to move, and the baffle 9 is sealed. The high-pressure gas is then output through the circular hole on the sleeve 8, so that the air pressure between the baffle 9 and the filter 7 in the sampling tube 1 increases, and then the impurities on the filter 7 are flushed out by the air pressure of the fixed plate 2, thereby avoiding the blockage of the device.

[0040] The above shows and describes the basic principles and main features of the present invention and the advantages of the present invention. It is obvious to those skilled in the art that the present invention is not limited to the details of the above exemplary embodiments, and the present invention can be implemented in other specific forms without departing from the spirit or basic features of the present invention. Therefore, no matter from which point of view, the embodiments should be regarded as exemplary and non-restrictive. The scope of the present invention is defined by the attached claims rather than the above description, and it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims are included in the present invention. Any figure mark in the claims should not be regarded as limiting the claims involved.

[0041] In addition, it should be understood that although this specification is described in accordance with the implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment can also be appropriately combined to form other implementation modes that can be understood by those skilled in the art. The above content is only to illustrate the technical idea of ​​the present invention, and cannot be used to limit the protection scope of the present invention. Any changes made on the basis of the technical solution according to the technical idea proposed by the present invention shall fall within the protection scope of the claims of the present invention.

Claims

1. A flue gas sampling device for preventing pipeline blockage, characterized in that: include: A sampling tube (1), wherein a first partition plate (10) and a second partition plate (11) are arranged on an inner side wall of the sampling tube (1), a second one-way valve (14) is arranged on a side wall of the first partition plate (10), and a fourth one-way valve (17) is arranged on an outer side wall of the second partition plate (11); A first piston (12), the first piston (12) being slidably disposed on the inner wall of the sampling tube (1), and the first piston (12) being located between the first partition plate (10) and the second partition plate (11); A power assembly, the power assembly being arranged on the outer side wall of the sampling tube (1), and being used for driving the first piston (12) to move back and forth; A storage component, the storage component is arranged on the outer wall of the sampling tube (1), and the storage component is used to store high-pressure gas; A one-way component, the one-way component being arranged at the end of the inner wall of the sampling tube (1); A sleeve (8), the sleeve (8) being arranged at the bottom of the inner wall of the sampling tube (1), and the sleeve (8) being close to the one-way component, and a plurality of circular holes distributed at equal distances are formed at the end of the outer wall of the sleeve (8), and the sleeve (8) is connected to the storage component; a second piston (29), the second piston (29) being slidably disposed on the inner wall of the sleeve (8); a second spring (30), one end of the second spring (30) being arranged on the inner wall of the sleeve (8) and the other end of the second spring (30) being fixed to the second piston (29); A sleeve rod (23) is arranged on a side wall of the second piston (29), and the sleeve rod (23) abuts against the one-way component.

2. A smoke sampling device for preventing pipeline blockage according to claim 1, characterized in that: The power components include: A motor (20), the motor (20) being arranged on the outer side wall of the sampling tube (1); A rotating disk (18), the rotating disk (18) being arranged on an output shaft of the motor (20), and the rotating disk (18) being located in the sampling tube (1); A transmission rod (15), the transmission rod (15) slidably penetrates the outer wall of the second partition plate (11), and the transmission rod (15) and the first piston (12) are fixed; A connecting rod (19) is provided at one end thereof rotatably on the eccentric side wall of the rotating disk (18), and the other end thereof is rotatably connected to the transmission rod (15).

3. A smoke sampling device for preventing pipeline blockage according to claim 2, characterized in that: Also includes: An output pipe (3), the output pipe (3) being arranged through the outer wall of the sampling tube (1), and the output pipe (3) being located between the first partition plate (10) and the first piston (12); A connecting tube (21), the connecting tube (21) is arranged to penetrate the outer wall of the sampling tube (1), and the connecting tube (21) is located between the first piston (12) and the second partition plate (11).

4. A smoke sampling device for preventing pipeline blockage according to claim 3, characterized in that: A first one-way valve (13) is provided at the end of the output pipe (3), and a third one-way valve (16) is provided at the end of the connecting pipe (21).

5. A smoke sampling device for preventing pipeline blockage according to claim 3, characterized in that: Storage components include: An air storage tank (4), the air storage tank (4) being arranged on the outer side wall of the sampling tube (1), and the air storage tank (4) being in communication with the connecting tube (21); A self-operated pressure regulating valve (22), the self-operated pressure regulating valve (22) being arranged through the outer wall of the gas storage tank (4); A solenoid valve (5), the solenoid valve (5) being arranged through the outer wall of the gas storage tank (4); An air delivery pipe (6), one end of the air delivery pipe (6) is connected to the sleeve (8), and the other end of the air delivery pipe (6) is connected to the solenoid valve (5).

6. A smoke sampling device for preventing pipeline blockage according to claim 5, characterized in that: One-way components include: A baffle (9), the baffle (9) being arranged on the inner wall of the sampling tube (1), and the outer wall of the baffle (9) being provided with a plurality of through holes distributed at equal distances; A fixing rod (27), the fixing rod (27) being arranged through the outer side wall of the baffle plate (9); A sealing plate (28), the sealing plate (28) being arranged at the end of the fixing rod (27) and being used for sealing the through hole; A connecting plate (25) is arranged at the end of the fixing rod (27), a first spring (26) is arranged on a side wall of the connecting plate (25), and the first spring (26) and the baffle (9) are fixed.

7. A smoke sampling device for preventing pipeline blockage according to claim 6, characterized in that: Also includes: A transmission plate (24), wherein the transmission plate (24) is arranged on a side wall of the connecting plate (25).

8. A smoke sampling device for preventing pipeline blockage according to claim 7, characterized in that: Also includes: The fixing plate (2) is fixedly sleeved on the outer side wall of the sampling tube (1).

9. A smoke sampling device for preventing pipeline blockage according to claim 8, characterized in that: Also includes: A filter screen (7) is arranged at the end of the sampling tube (1).

10. A flue gas sampling method for preventing pipeline blockage, characterized in that: The method is based on a smoke sampling device for preventing pipeline blockage according to any one of claims 1 to 9, comprising: The power assembly drives the first piston (12) to move back and forth, and through the second one-way valve (14) on the first baffle (10), the gas between the first baffle (10) and the one-way assembly enters the sampling tube (1) between the first baffle (10) and the first piston (12), thereby causing the air pressure between the first baffle (10) and the one-way assembly to decrease, thereby causing the gas in the sampling pipeline to enter the sampling tube (1), and then enter the sampling tube (1) through the through hole on the one-way assembly and into the space between the first baffle (10) and the one-way assembly, and then enter the sampling tube (1) through the second one-way valve (14) and into the space between the first baffle (10) and the first piston (12), and finally the output flue gas is sampled; At the same time, during the movement of the first piston (12), external gas enters the sampling tube (1) through the fourth one-way valve (17) on the second partition (11) and is stored between the first piston (12) and the second partition (11).

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