Sampling mechanism and sampling method for high-temperature waste gas laboratory detection

Abstract

The invention discloses a sampling mechanism and a sampling method for laboratory detection of high-temperature waste gas, and belongs to the field of laboratory gas sampling. A sampling mechanism for high-temperature waste gas laboratory detection comprises a collection outer cylinder and a connecting threaded pipe fixed to the surface of the collection outer cylinder, and further comprises a filter cover installed at the end of the collection outer cylinder, and a plurality of filter holes are formed in the surface of the filter cover; the preheating mechanism is fixed on the surface of the collecting outer cylinder and is used for preheating the interior of the collecting outer cylinder; the pretreatment mechanism is arranged in the preheating mechanism and is used for pretreating the interior of the filter cover; according to the high-temperature exhaust gas sampling device, sampling gas in the later period is completely consistent with gas flowing in the high-temperature exhaust pipe, meanwhile, high-temperature exhaust gas sampling smoothness is guaranteed, high-temperature exhaust gas in different directions is rotationally extracted, the sampling error caused by the condensation phenomenon is prevented, and the quality of highly reduced high-temperature exhaust gas is further guaranteed.

Description

Technical Field

[0001] The present invention relates to the technical field of laboratory gas sampling, and in particular to a sampling mechanism and a sampling method for laboratory detection of high-temperature exhaust gas. Background Art

[0002] Existing portable gas sampling and analysis instruments can only analyze the concentration of one or several specific harmful gases in real time while sampling. However, there may be many types of pollutants in high-temperature exhaust gases. Portable analyzers cannot comprehensively detect all pollutant components of high-temperature exhaust gases. To comprehensively analyze the concentration of all pollutants in the sampled gas, a special gas analysis laboratory is required. Therefore, it is necessary to sample and store real high-temperature flue gas samples on site, and then take the samples to a special gas analysis laboratory for systematic gas analysis.

[0003] As in the prior art, the Chinese patent authorization number is CN111207966A, the application date is 2020-01-16, and the name is a sampling mechanism for high-temperature exhaust gas laboratory detection, including a high-temperature exhaust pipe, one end of which is a high-temperature exhaust port for high-temperature exhaust gas; it also includes a long rod-shaped sampling tool, one end of the sampling tool is arranged to be a bent structure, and the end of the bent structure is the sampling end, which can be inserted into the high-temperature exhaust port and can absorb part of the flue gas sample flowing in the high-temperature exhaust pipe; the structure of the present invention is simple, and hot air is used to heat the wall of the heat exchange tube to prevent condensation, so that the gas in the sample storage tube is completely consistent with the gas flowing in the high-temperature exhaust pipe, thereby improving the authenticity of the gas analysis.

[0004] However, the above patent still has the disadvantage that, during the sampling process of high-temperature exhaust gas, although the dust particle filter can be heated to improve the authenticity of gas analysis, when the filter is used for a long time, the internal filter holes cannot be cleaned in time, and the smoothness of high-temperature exhaust gas sampling cannot be guaranteed, resulting in the high-temperature exhaust gas speed being affected by the blockage, and the exhaust gas sampling cannot be adjusted, resulting in the problem of single high-temperature exhaust gas data in the same direction sampling, further reducing the operability of the sampling mechanism. Summary of the invention

[0005] The purpose of the present invention is to solve the above problems in the prior art and to propose a sampling mechanism for high-temperature exhaust gas laboratory testing.

[0006] In order to achieve the above object, the present invention adopts the following technical solutions: A sampling mechanism for laboratory testing of high-temperature exhaust gas includes a collection outer cylinder and a connecting threaded tube fixed on the surface of the collection outer cylinder, and also includes: a filter cover installed at the end of the collection outer cylinder, and a plurality of filter holes are opened on the surface of the filter cover; a preheating mechanism fixed on the surface of the collection outer cylinder to preheat the interior of the collection outer cylinder; a pretreatment mechanism arranged inside the preheating mechanism to pretreat the interior of the filter cover; a storage mechanism installed at the end of the connecting threaded tube to sample the exhaust gas.

[0007] Preferably, the preheating mechanism includes a centrifugal blower and a heater fixed on the surface of the collecting outer cylinder, the air outlet end of the centrifugal blower is connected to the heater through a pipe, the side wall of the heater is fixedly connected with an air supply pipe, the end of the air supply pipe is fixedly connected with a preheating pipe, the side wall of the preheating pipe is fixed with a plurality of branch pipes, and the ends of the branch pipes are connected to the inner wall of the collecting outer cylinder.

[0008] Preferably, the pretreatment mechanism includes a rotating shaft rotating on the surface of the preheating tube through a bearing, and the surface of the rotating shaft is fixedly connected with blade one and blade two, respectively. Blade one is located inside the preheating tube, and both ends of the rotating shaft are fixedly connected with a cleaning shell and a winding assembly, respectively, and the cleaning shell is fitted inside the filter cover.

[0009] Preferably, the storage mechanism comprises a sampling cylinder threadedly connected to the inside of the connecting threaded tube, a piston rod is slidably connected to the inside of the sampling cylinder, a piston block and a connecting handle are fixedly connected to both ends of the piston rod, and the piston block slides inside the sampling cylinder.

[0010] Preferably, the winding assembly includes a winding roller fixed at the end of a rotating shaft, a winding rope is wound around the surface of the winding roller, the end of the winding rope is fixedly connected to a connecting rod, the end of the connecting rod passes through the preheating tube and the collection outer cylinder in sequence and extends to be installed on the connecting handle.

[0011] Preferably, a heat preservation chamber is provided inside the collection outer cylinder, and the inside of the heat preservation chamber is connected to the inside of the branch pipe.

[0012] Preferably, a heating plate is fixedly connected to the interior of the heat preservation chamber, and the heating plate is fixed in a spiral shape.

[0013] Preferably, a notch is provided on the surface of the cleaning shell, and the size of the notch is larger than the size of the filter hole.

[0014] Preferably, a support handle is fixedly connected to the bottom of the collection outer cylinder, and the support handle is used to support and take the collection outer cylinder.

[0015] A sampling method for high temperature exhaust gas laboratory testing mainly includes the following steps: S1. First, open the one-way valve connected to the surface of the threaded pipe, and operate the preheating mechanism so that the inside of the collection outer cylinder can be preheated, so as to heat the collection outer cylinder and the filter cover to a certain temperature; S2. When the preheating mechanism supplies air to the inner part of the collection outer cylinder, the pretreatment mechanism can be rotated counterclockwise synchronously. When the pretreatment mechanism is driven, the inside of the filter cover can be scraped and cleaned to prevent the filter hole from being blocked and affecting the efficiency of subsequent sampling. When the pretreatment mechanism is driven counterclockwise, the storage mechanism of the synchronous belt can work forward. When the storage mechanism works forward, the internal gas can be emptied. S3, then control the filter cover at the end of the collection outer tube to go deep into the exhaust pipe. Since the collection outer tube and the inside of the filter cover have been heated to a sufficient temperature before, no condensation will occur at the filter cover. At this time, the storage mechanism works to sample the high-temperature exhaust gas. Compared with the prior art, the present invention provides a sampling mechanism for high-temperature exhaust gas laboratory testing, which has the following beneficial effects: 1. The sampling mechanism of the high-temperature exhaust gas laboratory test can preheat the filter cover through the cooperation between the centrifugal blower, heater, air supply pipe and preheating pipe. Through this setting, the later sampling gas is completely consistent with the gas flowing in the high-temperature exhaust pipe, preventing the sampling error caused by condensation, and further ensuring the quality of highly restored high-temperature exhaust gas.

[0016] 2. The sampling mechanism of the high-temperature exhaust gas laboratory test can clean the inside of the filter cover in advance when the preheating mechanism is working through the cooperation between the rotating shaft, the fan blade 1, the fan blade 2, the cleaning shell and the winding assembly. This arrangement ensures smooth sampling of high-temperature exhaust gas, prevents the high-temperature exhaust gas speed from being affected by blockage, and further improves the sampling efficiency. 3. The sampling mechanism of the high-temperature exhaust gas laboratory test, through the cooperation between the sampling tube, piston rod, piston block, and so on, can synchronously drive the pretreatment mechanism to work during the slow extraction process. Through this setting, it is possible to extract high-temperature exhaust gas in different directions by rotation, avoiding the problem of single data of high-temperature exhaust gas sampling in the same direction, and further improving the operability of the sampling mechanism.

[0017] The parts not involved in the device are the same as the existing technology or can be implemented by the existing technology. The present invention realizes that the later sampling gas is completely consistent with the gas flowing in the high-temperature exhaust pipe. At the same time, it ensures the smoothness of the high-temperature exhaust gas sampling, and rotates to extract the high-temperature exhaust gas in different directions to prevent the sampling error caused by condensation, thereby further improving the operability of the sampling mechanism. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a schematic diagram of the structure of a sampling mechanism for high-temperature exhaust gas laboratory testing proposed by the present invention; Figure 2 A schematic diagram of the top view of a sampling mechanism for high-temperature exhaust gas laboratory testing proposed by the present invention; Figure 3 This is a schematic diagram of the AA cross-section structure of a sampling mechanism for high-temperature exhaust gas laboratory testing proposed by the present invention; Figure 4 This is a front structural schematic diagram of a sampling mechanism for high-temperature exhaust gas laboratory testing proposed by the present invention; Figure 5 This is a schematic diagram of the BB-section structure of a sampling mechanism for high-temperature exhaust gas laboratory testing proposed by the present invention; Figure 6 A sampling mechanism for high-temperature exhaust gas laboratory testing proposed by the present invention Figure 5 The enlarged structural diagram at A in the middle; Figure 7 A schematic diagram of the cleaning shell structure of a sampling mechanism for high-temperature exhaust gas laboratory testing proposed by the present invention; Figure 8 This is a schematic diagram of the right side structure of a sampling mechanism for high-temperature exhaust gas laboratory testing proposed by the present invention.

[0019] In the figure: 1. Collection outer cylinder; 2. Connecting threaded tube; 11. Insulation chamber; 12. Heating plate; 3. Filter cover; 31. Filter hole; 4. Preheating mechanism; 41. Centrifugal blower; 42. Heater; 43. Air supply pipe; 44. Preheating pipe; 45. Branch pipe; 5. Pretreatment mechanism; 51. Rotating shaft; 52. Blade 1; 53. Blade 2; 54. Cleaning shell; 541. Notch; 55. Winding assembly; 551. Winding roller; 552. Winding rope; 553. Connecting rod; 6. Storage mechanism; 61. Sampling cylinder; 62. Piston rod; 63. Piston block; 64. Connecting handle; 7. Support handle. DETAILED DESCRIPTION

[0020] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0021] In the description of the present invention, it is necessary to understand that the terms "upper", "lower", "front", "back", "left", "right", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0022] In one embodiment, reference Figure 1-Figure 8 A sampling mechanism for laboratory testing of high-temperature exhaust gas includes a collection outer cylinder 1 and a connecting threaded tube 2 fixed on the surface of the collection outer cylinder 1, and also includes: a filter cover 3, installed at the end of the collection outer cylinder 1, and a plurality of filter holes 31 are opened on the surface of the filter cover 3; a preheating mechanism 4, fixed on the surface of the collection outer cylinder 1, for preheating the interior of the collection outer cylinder 1; a pretreatment mechanism 5, arranged inside the preheating mechanism 4, for pretreatment of the interior of the filter cover 3; a storage mechanism 6, installed at the end of the connecting threaded tube 2, for sampling exhaust gas, and a support handle 7 is fixedly connected to the bottom of the collection outer cylinder 1, and the support handle 7 is used to support and take the collection outer cylinder 1.

[0023] By adopting such a scheme, the preheating mechanism 4 is driven to preheat the collection outer cylinder 1 and the filter cover 3 in advance, and the preheating mechanism 4 can synchronously drive the pretreatment mechanism 5 to rotate, so as to clean the inside of the filter cover 3, thereby ensuring the efficiency of the later high-temperature exhaust gas sample sampling. At the same time, when the pretreatment mechanism 5 is working, it can drive the storage mechanism 6 to work forward, so as to discharge the gas inside the storage mechanism 6, so as to facilitate the later sampling work and ensure the accuracy of the high-temperature exhaust gas sampling.

[0024] During the specific operation, firstly, the threaded tube 2 is connected to the bottom of the collection outer cylinder 1 so that it can be connected to the storage mechanism 6, and then the pretreatment mechanism 5 is connected to the storage mechanism 6. At this time, the preheating mechanism 4 works so that it can preheat the inside of the collection outer cylinder 1 and the filter cover 3, so that the collection outer cylinder 1 and the filter cover 3 are heated to a certain temperature, and then the filter cover 3 at the end of the collection outer cylinder 1 is deeply inserted into the high-temperature exhaust gas pipeline through the hand-held support handle 7, so that the filter cover 3 is completely immersed in the high-temperature exhaust gas environment. Since the collection outer cylinder 1 and the filter cover 3 have been heated to a sufficient temperature before, condensation will not occur at the collection outer cylinder 1 and the filter cover 3 at this time. Then, a filter hole 31 is opened on the surface of the filter cover 3 so that the high-temperature exhaust gas can enter the collection outer cylinder 1. At this time, the storage mechanism 6 works backward so that the high-temperature exhaust gas inside the collection outer cylinder 1 can be extracted. When the storage mechanism 6 works backward, the pretreatment mechanism 5 is driven to work synchronously, so that sample gases at different positions inside the high-temperature exhaust gas pipeline can be extracted to ensure the diversity of later detection.

[0025] In addition, the bottom of the support handle 7 may be threadedly connected to a seat, so that it can be supported by the ground, relieving the staff from having to hold the support handle 7 for a long time while working.

[0026] In one embodiment, reference Figure 2 and Figure 3 A sampling mechanism for high-temperature exhaust gas laboratory detection includes a collection outer cylinder 1, and a connecting threaded tube 2 fixed on the surface of the collection outer cylinder 1, and also includes: a filter cover 3, which is installed at the end of the collection outer cylinder 1, and a plurality of filter holes 31 are opened on the surface of the filter cover 3; a preheating mechanism 4, which is fixed on the surface of the collection outer cylinder 1, and is used to preheat the inside of the collection outer cylinder 1; a pretreatment mechanism 5, which is arranged inside the preheating mechanism 4, and is used to pretreat the inside of the filter cover 3; a storage mechanism 6, which is installed at the end of the connecting threaded tube 2, and is used to sample the exhaust gas, and the preheating mechanism 4 It includes a centrifugal blower 41 and a heater 42 fixed on the surface of the collecting outer tube 1. The air outlet end of the centrifugal blower 41 is connected to the heater 42 through a pipeline. The side wall of the heater 42 is fixedly connected with an air supply pipe 43. The end of the air supply pipe 43 is fixedly connected with a preheating pipe 44. The side wall of the preheating pipe 44 is fixed with a plurality of branch pipes 45. The end of the branch pipe 45 is connected to the inner wall of the collecting outer tube 1. The inside of the collecting outer tube 1 is provided with a heat preservation chamber 11. The inside of the heat preservation chamber 11 is connected to the inside of the branch pipe 45. The inside of the heat preservation chamber 11 is fixedly connected with a heating plate 12. The heating plate 12 is spirally fixed.

[0027] By adopting such a scheme, the preheating mechanism 4 can be driven to preheat the inside of the collection outer tube 1 and the filter cover 3, so that the inner and outer walls of the collection outer tube 1 and the filter cover 3 are in a heating state, thereby ensuring that the high-temperature sample gas flowing through the collection outer tube 1 will not condense.

[0028] During specific operation, the centrifugal blower 41 is operated to generate wind force to be transported to the inside of the heater 42, and then the wind force is converted into hot air by the heater 42, and then transported to the inside of the preheating tube 44 through the air supply pipe 43. The collection outer cylinder 1 and the inside of the filter cover 3 can be preheated through the preheating pipe 44, and then flow into the insulation chamber 11 through the branch pipe 45, so that the outer wall of the collection outer cylinder 1 can be preheated. At the same time, when the high-temperature hot air flows through the surface of the heating plate 12 in the insulation chamber 11, the branch pipe 45 and the insulation chamber 11 are in a heating state, thereby forming a continuous heating state in the collection outer cylinder 1 and the filter cover 3, avoiding the condensation problem when the subsequent collection outer cylinder 1 and the filter cover 3 encounter high-temperature sample gas. Through the setting of the opening on the surface of the insulation chamber 11, it is convenient to discharge the heated wind force.

[0029] In one embodiment, reference Figure 2 and Figure 3 , Figure 5 , Figure 6 , Figure 7 The pretreatment mechanism 5 includes a rotating shaft 51 that rotates on the surface of the preheating tube 44 through a bearing, and the surface of the rotating shaft 51 is fixedly connected with a fan blade 1 52 and a fan blade 2 53 respectively. The fan blade 1 52 is located inside the preheating tube 44, and the two ends of the rotating shaft 51 are fixedly connected with a cleaning shell 54 and a winding assembly 55 respectively. The cleaning shell 54 fits inside the filter cover 3, and the winding assembly 55 includes a winding roller 551 fixed at the end of the rotating shaft 51, and a winding rope 552 is wound around the surface of the winding roller 551. The end of the winding rope 552 is fixedly connected with a connecting rod 553, and the end of the connecting rod 553 passes through the preheating tube 44 and the collection outer cylinder 1 in sequence and extends to be installed on the connecting handle 64. A notch 541 is opened on the surface of the cleaning shell 54, and the size of the notch 541 is larger than the size of the filter hole 31.

[0030] By adopting such a scheme, the pretreatment mechanism 5 is set up so that when the preheating mechanism 4 is working, it can synchronously drive the pretreatment mechanism 5 to work. When the pretreatment mechanism 5 is working, the inside of the filter cover 3 can be cleaned, so that the blockages in the filter holes 31 inside the filter cover 3 can be cleaned to prevent affecting the subsequent sampling speed.

[0031] During specific operation, the bearing of the rotating shaft 51 is connected to the inside of the preheating tube 44, so that when the preheating tube 44 supplies air, the fan blade 52 connected to the rotating shaft 51 is rotated counterclockwise by the wind force, and the fan blade 52 at the end of the rotating shaft 51 can be rotated synchronously. The rotation of the rotating shaft 51 can synchronously drive the cleaning shell 54 and the winding component 55 to rotate synchronously. Under the rotation of the cleaning shell 54, the blockage inside the filter hole 31 opened on the surface of the filter cover 3 can be cleaned, so as to facilitate the sampling work in the later stage. Under the counterclockwise rotation of the winding component 55, the winding rope 552 on the surface of the winding roller 551 can be wound up, and the connecting rod 553 can be reset inward when the winding rope 552 is wound up, so as to drive the storage mechanism 6 to work forward, thereby exhausting the air inside the storage mechanism 6. In one embodiment, reference Figure 5 The storage mechanism 6 includes a sampling cylinder 61 which is threadedly connected to the inside of the connecting threaded tube 2. A piston rod 62 is slidably connected to the inside of the sampling cylinder 61. The two ends of the piston rod 62 are respectively fixedly connected to a piston block 63 and a connecting handle 64. The piston block 63 slides inside the sampling cylinder 61.

[0032] By adopting such a scheme, the high-temperature exhaust gas inside the outer cylinder 1 can be slowly extracted through the setting of the storage mechanism 6, so that part of the high-temperature exhaust gas inside the outer cylinder 1 can be stored. When a certain amount of high-temperature exhaust gas is extracted, the staff only needs to disassemble the storage mechanism 6 and transport it to the laboratory for testing.

[0033] During the specific operation, the sampling tube 61 is firstly connected to the end of the connecting threaded tube 2 through a threaded connection, and then the air inside the sampling tube 61 is discharged in advance when the inside of the collecting outer tube 1 is preheated. When the high-temperature exhaust gas enters the inside of the collecting outer tube 1, the piston rod 62 moves slowly backward, so that it can drive the piston block 63 to move in the sampling tube 61. When the piston block 63 moves inside the sampling tube 61, a negative pressure chamber can be generated. Since the connecting threaded tube 2 is connected to the inside of the collecting outer tube 1, it can extract part of the high-temperature exhaust gas inside the collecting outer tube 1 into the sampling tube 61, thereby completing the sampling of the high-temperature exhaust gas. By setting the connecting handle 64, it is convenient for the staff to better perform the extraction work. When the piston rod 62 moves backward, the winding assembly 55 of the synchronous belt can work. Since the winding assembly 55 is installed on the connecting handle 64, when the connecting handle 64 moves backward, it synchronously drives the connecting rod 553 to move backward. When the connecting rod 553 moves backward, it can synchronously drive the winding rope 552 to stretch. During the stretching process of the winding rope 552, the winding roller 551 can drive the rotating shaft 51 to rotate clockwise. When the rotating shaft 51 rotates, the end cleaning shell 54 and the fan blade 2 53 can be rotated synchronously. The rotation of the second 53 can play a drainage role, so that the high-temperature exhaust gas can be introduced into the collection outer cylinder 1 for sampling more quickly, and then the different directions of the notch 541 can be changed when the cleaning shell 54 is rotated. Since the cleaning shell 54 fits tightly inside the filter cover 3, the high-temperature exhaust gas can only be opened through the filter hole 31 aligned with the notch 541, while the filter holes 31 in other parts are in a blocked state, so that only the high-temperature exhaust gas in the open direction of the notch 541 can be extracted, and the high-temperature exhaust gas in different directions can be sampled by rotating the cleaning shell 54.

[0034] In addition, a one-way valve is fixedly connected to the end of the sampling tube 61, so that when disassembling, it is only necessary to close the one-way valve of the sampling tube 61, thereby ensuring that there will be no leakage during transportation, and the internal material of the sampling tube 61 is a heat-insulating material to reduce the loss of temperature.

[0035] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A sampling mechanism for high-temperature exhaust gas laboratory testing, comprising a sampling outer cylinder (1), and a connecting threaded tube (2) fixed on the surface of the sampling outer cylinder (1), characterized in that: Also includes: A filter cover (3) is mounted on the end of the collection outer cylinder (1), and a plurality of filter holes (31) are formed on the surface of the filter cover (3); A preheating mechanism (4) is fixed to the surface of the collection outer cylinder (1) and is used to preheat the interior of the collection outer cylinder (1); A pretreatment mechanism (5) is arranged inside the preheating mechanism (4) and is used to pretreat the interior of the filter cover (3); The storage mechanism (6) is installed at the end of the connecting threaded pipe (2) and is used to sample the exhaust gas.

2. A sampling mechanism for high-temperature exhaust gas laboratory testing according to claim 1, characterized in that: The preheating mechanism (4) comprises a centrifugal blower (41) and a heater (42) fixed on the surface of the collection outer cylinder (1); an air outlet end of the centrifugal blower (41) is connected to the heater (42) via a pipeline; an air supply pipe (43) is fixedly connected to the side wall of the heater (42); an end of the air supply pipe (43) is fixedly connected to a preheating pipe (44); a plurality of branch pipes (45) are fixed to the side wall of the preheating pipe (44); and the ends of the branch pipes (45) are connected to the inner wall of the collection outer cylinder (1).

3. A sampling mechanism for high-temperature exhaust gas laboratory testing according to claim 1, characterized in that: The pretreatment mechanism (5) comprises a rotating shaft (51) which rotates on the surface of the preheating tube (44) via a bearing, and the surface of the rotating shaft (51) is fixedly connected to a first fan blade (52) and a second fan blade (53), respectively, and the first fan blade (52) is located inside the preheating tube (44), and the two ends of the rotating shaft (51) are fixedly connected to a cleaning shell (54) and a winding assembly (55), respectively, and the cleaning shell (54) is fitted inside the filter cover (3).

4. A sampling mechanism for high-temperature exhaust gas laboratory testing according to claim 1, characterized in that: The storage mechanism (6) comprises a sampling cylinder (61) which is threadedly connected to the inside of the connecting threaded tube (2); a piston rod (62) is slidably connected to the inside of the sampling cylinder (61); two ends of the piston rod (62) are respectively fixedly connected to a piston block (63) and a connecting handle (64); and the piston block (63) slides inside the sampling cylinder (61).

5. The sampling mechanism for high-temperature exhaust gas laboratory testing according to claim 3 is characterized in that: The winding assembly (55) comprises a winding roller (551) fixed to the end of the rotating shaft (51), a winding rope (552) being wound around the surface of the winding roller (551), the end of the winding rope (552) being fixedly connected to a connecting rod (553), the end of the connecting rod (553) passing through the preheating tube (44) and the collection outer cylinder (1) in sequence and extending to be mounted on the connecting handle (64).

6. The sampling mechanism for high-temperature exhaust gas laboratory testing according to claim 1 is characterized in that: A heat preservation chamber (11) is provided inside the collection outer cylinder (1), and the interior of the heat preservation chamber (11) is connected to the interior of the branch pipe (45).

7. A sampling mechanism for high-temperature exhaust gas laboratory testing according to claim 6, characterized in that: A heating plate (12) is fixedly connected to the interior of the heat preservation cavity (11), and the heating plate (12) is fixed in a spiral shape.

8. The sampling mechanism for high-temperature exhaust gas laboratory testing according to claim 3 is characterized in that: A notch (541) is provided on the surface of the cleaning shell (54), and the size of the notch (541) is larger than the size of the filter hole (31).

9. The sampling mechanism for high-temperature exhaust gas laboratory testing according to claim 1 is characterized in that: A support handle (7) is fixedly connected to the bottom of the collection outer cylinder (1), and the support handle (7) is used to support and take the collection outer cylinder (1).

10. A sampling method for high-temperature exhaust gas laboratory detection, comprising a sampling mechanism for high-temperature exhaust gas laboratory detection according to claim 5, characterized in that: The main steps include: S1. First, the one-way valve connected to the surface of the threaded tube (2) is opened, and the preheating mechanism (4) is operated so that the inside of the collection outer cylinder (1) can be preheated, so as to heat the collection outer cylinder (1) and the filter cover (3) to a certain temperature; S2. During the process of the preheating mechanism (4) supplying air to the interior of the collection outer cylinder (1), the pretreatment mechanism (5) can be synchronously rotated counterclockwise. When the pretreatment mechanism (5) is driven, the interior of the filter cover (3) can be scraped and cleaned to prevent the filter hole (31) from being blocked and affecting the efficiency of subsequent sampling. When the pretreatment mechanism (5) is driven counterclockwise, the storage mechanism (6) can be synchronously driven to work forward. When the storage mechanism (6) is working forward, the internal gas can be emptied. S3, then control the filter cover (3) at the end of the collection outer cylinder (1) to penetrate into the exhaust gas pipeline. Since the inner part of the collection outer cylinder (1) and the filter cover (3) have been heated to a sufficient temperature before, condensation will not occur at the filter cover (3). At this time, the storage mechanism (6) works to enable the high-temperature exhaust gas to be sampled.

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