Flue gas sampler with automatic ash and coke removal function

Abstract

The invention discloses a flue gas sampler with automatic dedusting and decoking functions, which comprises a sampling detection device and a sampling pipe mounted on the sampling detection device and used for sampling gas, and a cleaning mechanism is mounted in the sampling detection device; the cleaning mechanism comprises a cleaning rod, a push-back assembly and a driving assembly, at least one cleaning head is coaxially installed at the far end of the cleaning rod, a plurality of cleaning blades are installed on the outer surface of the cleaning head in the circumferential direction, a first variable-diameter adjusting structure is installed in the cleaning head, and the cleaning blades are controlled to be close to the outer surface of the cleaning head through the first variable-diameter adjusting structure. The cleaning blade is arranged at one end of the cleaning head or is far away from the outer surface of the cleaning head to realize a reducing function, so that the cleaning blade can extend into the sampling pipe in a small-diameter state, blockage of impurities such as coking is avoided, and when the cleaning blade reaches the other end of the sampling pipe, the cleaning blade is unfolded according to needs, gradual cleaning work is carried out through retreating and rotating operation, and the pushing-back assembly is matched to realize the cleaning effect. Impurities are synchronously brought out of the sampling pipe, and the effective cleaning effect of the sampling pipe is ensured.

Description

Technical Field

[0001] The present invention relates to the technical field of furnace gas detection, and particularly to a flue gas sampler with an automatic ash and coke removal function. Background Art

[0002] Large coal-fired boilers often need to install gas sampling points in the furnace area to obtain the distribution of various gases in the furnace in real time, such as oxygen, carbon monoxide, hydrogen sulfide, nitrogen oxides, etc., which are used to provide a control basis for guiding combustion operation and controlling the optimal air-coal ratio. Among them, the sampling pipe is extremely prone to ash blockage and coking. The cause of coking is that the ash particles of coal are in a molten state. After contacting the low-temperature area near the sampling pipe, a colloidal substance will form at the head and inside of the sampling pipe, thus blocking the sampling pipe. The traditional pneumatic ash removal method cannot effectively remove coking. Therefore, after running for a period of time, the sampling pipe will be severely blocked, resulting in the inability to smoothly complete gas sampling.

[0003] In the prior art, the cleaning is performed by inserting a cleaning rod into the sampling pipe and performing radial movements, including linear friction, rotary scraping, etc. For example, the patent application number is CN202310580410.7, and the invention name is a sampling device for detecting furnace gas in a power plant boiler, which includes a sampling part, a coke removal part, and an air guiding part; the coke removal part includes an electric pusher and a coke removal tungsten carbide rod. The electric pusher is arranged in the inner cavity of the sampling box, the coke removal tungsten carbide rod is arranged at the output end of the electric pusher, and one end of the output end of the electric pusher and the coke removal tungsten carbide rod is located in the guiding and connecting assembly, and the other end of the coke removal tungsten carbide rod is located in the inner cavity of the three-way pipe or penetrates through the three-way pipe, which adopts the way of linearly pushing by an electric push rod, and the application number is 202311549567.X; the invention name is a furnace gas detection device, which includes a cleaning part arranged in the detection box and facing the central axis of the sampling pipe; a first driving part arranged in the detection box for driving the cleaning part to reciprocate along the length direction of the sampling pipe; and a second driving part arranged in the detection box for driving the cleaning part to rotate around the central axis of the sampling pipe. Designed in this way, by driving the cleaning part into the sampling pipe by the first driving part and moving axially, and at the same time driving the cleaning part to rotate by the second driving part, the cleaning part can perform rotary cutting on the ash blockage and coking of the sampling pipe to achieve the cleaning of the sampling pipe, adopting the linear plus rotary method; although adding rotation can avoid the problem that the cleaning movement is stuck due to severe ash blockage or coking during the impurity removal process, the prior art has the following problems: the diameter of the cleaning structure is fixed. On the one hand, when the coking inside the sampling pipe is severe, it is easy to block the cleaning structure from entering the sampling pipe. On the other hand, it cannot effectively and comprehensively perform the radial cleaning work on the inner wall of the sampling pipe, and it cannot effectively transport the impurities out of the sampling pipe after cleaning. Summary of the Invention

[0004] The object of the present invention is to provide a flue gas sampler with an automatic ash and coke removal function to solve the technical problems mentioned in the above background art.

[0005] To solve the above technical problems, the present invention adopts the following technical solutions: A flue gas sampler with an automatic ash and coke removal function, including a sampling and detection device and a sampling pipe installed on the sampling and detection device for sampling gas, and a cleaning mechanism is installed in the sampling and detection device; The cleaning mechanism includes: A cleaning rod, one end of the cleaning rod extending into the sampling pipe is the distal end, at least one cleaning head is coaxially installed at the distal end of the cleaning rod, a plurality of cleaning blades are installed on the outer surface of the cleaning head along the circumferential direction, a first variable diameter adjustment structure is installed in the cleaning head, and the first variable diameter adjustment structure is correspondingly provided with a first push-pull rod for each cleaning blade, and the first variable diameter adjustment structure is configured to control the cleaning blade to approach or move away from the outer surface of the cleaning head along the radial direction through the first push-pull rod; A return push assembly is installed at one end of the cleaning head at the farthest end away from the cleaning rod, and the working state radius of the return push assembly is not less than the outer diameter formed by the combination of the cleaning head and the cleaning blades; A driving assembly is installed in the sampling and detection device and is connected to the proximal end of the sampling pipe, and the driving assembly is configured to: Control the cleaning rod to extend into the sampling pipe or disengage from the sampling pipe and enter the sampling and detection device; Control the cleaning rod to rotate or control the radial adjustment operation of the variable diameter adjustment structure.

[0006] Preferably, the first variable diameter adjustment structure includes a rotating plate, and guiding channels are provided on the rotating plate corresponding to each first push-pull rod; One end of the guiding channel is close to the center of the rotating plate, and the other end is close to the edge of the rotating plate; A convex block is provided on the first push-pull rod, and the convex block is inserted into the corresponding guiding channel; When the rotating plate is configured to rotate, it controls the relative position of the convex block in the guiding channel, drives the first push-pull rod to move radially, and simultaneously drives the cleaning blade to move radially.

[0007] Preferably, the return push assembly includes: A base column, the base column is coaxially installed at one end of the cleaning head at the farthest end away from the cleaning rod, and the diameter of the base column is not greater than the end face diameter of the cleaning rod; An elastic layer is provided on the outer circumference of the base column; The second variable-diameter adjusting structure is installed inside the base column, and the second variable-diameter adjusting structure is the same as the first variable-diameter adjusting structure. A plurality of second push rods are correspondingly arranged between the second variable-diameter adjusting structure and the elastic layer. The second variable-diameter adjusting structure is configured to control the radial expansion or reset of the elastic layer deformation protrusion along the radial direction through the second push rods. Among them, the deformation state of the elastic layer is used as the working state.

[0008] Preferably, sleeves are arranged at both ends of the elastic layer, and the sleeves are sleeved on the base column. As the elastic layer deforms or resets, the sleeves slide correspondingly along the base column.

[0009] Preferably, arc-shaped attaching plates are arranged at the ends of the second push rods, and the arc-shaped attaching plates are connected to the central area of the elastic layer; and A circle of convex strips is arranged at the corresponding position of the outer side of the elastic layer and the arc-shaped attaching plate.

[0010] Preferably, the cleaning rod includes an outer rod and an inner rod arranged coaxially. The distal end of the outer rod is connected to the cleaning head, and the distal end of the inner rod is connected to the rotating plate; The driving assembly includes: A rotating motor having an output shaft. The output shaft is cylindrical, and internal teeth are arranged on the inner surface of the cylindrical output shaft, and external teeth are arranged on the outer surface of the cylindrical output shaft; a first receiving gear sleeve is installed at the proximal end of the outer rod, and a second receiving gear sleeve is installed at the proximal end of the inner rod; At least one driving lead screw along the axis direction of the sampling tube. The rotating motor is assembled on the driving lead screw through a nut. When the driving lead screw rotates, it is configured to drive: The rotating motor moves along the rotating motor; The output shaft meshes with the second receiving gear sleeve through the internal teeth, and disengages from the first receiving gear sleeve through the external teeth; or the output shaft meshes with the first receiving gear sleeve through the external teeth, and disengages from the second receiving gear sleeve through the internal teeth.

[0011] Preferably, the cleaning blade is a spiral section structure, and a spiral notch is arranged at the corresponding position of the outer surface of the cleaning head and the cleaning blade. The spiral notch is used to accommodate the cleaning blade.

[0012] Preferably, at least two cleaning heads are coaxially installed at the distal end of the cleaning rod, and the cleaning blades corresponding to each cleaning head along the axis direction are arranged in a spiral manner.

[0013] Preferably, the cleaning head is a frustum structure. The plane with a smaller diameter is defined as the top surface. The top surface of the frustum structure faces the sampling and detection device, and each cleaning blade is inclined along the side surface of the frustum structure.

[0014] Preferably, a through hole is provided at the connection between the sampling detection device and the sampling tube; a receiving mechanism is provided inside the sampling detection device, and the receiving mechanism includes: A receiving bin, which is arranged at the bottom of the sampling detection device. The first opening of the receiving bin corresponds to the outside of the through hole, and the second opening of the receiving bin corresponds to the inside of the through hole; A converging cavity, which is arranged outside the through hole, and the converging cavity is used to guide impurities outside the through hole into the first opening; A scraping plate, which is arranged inside the through hole and coaxially arranged with the through hole. The scraping plate is used to scrape impurities on the cleaning rod; and an independent space communicating with the second opening is divided inside the through hole Beneficial effects: In the present invention, the first variable diameter adjustment structure is used to control the cleaning blade to approach or move away from the outer surface of the cleaning head, realizing the variable diameter function. Thus, it can extend into the sampling tube in a state of a smaller diameter, avoiding the blockage of impurities such as coking. When reaching the other end of the sampling tube, the cleaning blade is unfolded as needed, and through the operation of retracting and rotating simultaneously, step-by-step cleaning work is carried out, thereby repeatedly removing ash and coke in the sampling tube, and cooperating with the action of the pushing-back component, synchronously bringing out the impurities from the sampling tube to ensure an effective cleaning effect of the sampling tube.

[0015] In addition, in the present invention, the pushing-back component cooperates with the second variable diameter adjustment structure to synchronously expand the deformation protrusions of the elastic layer in the radial direction, so as to effectively abut against the inner wall of the sampling tube, and fully bring out the impurities processed by the cleaning blade during the retracting operation. Description of the Drawings

[0016] The drawings are used to provide a further understanding of the present invention, and constitute a part of the specification. They are used together with the embodiments of the present invention to explain the present invention, and do not constitute a limitation to the present invention.

[0017] In the drawings: Figure 1 is a schematic structural diagram of the flue gas sampler of the present invention; Figure 2 is a schematic structural diagram of the interior of the flue gas sampler of the present invention; Figure 3 is a schematic structural diagram of the cleaning mechanism of the present invention; Figure 4 is a schematic structural diagram of the cleaning head and the pushing-back component of the present invention; Figure 5 is a front view of the pushing-back component and the rotating plate of the present invention; Figure 6 is a schematic structural diagram of the elastic layer of the present invention; Figure 7 is a schematic structural diagram of multiple cleaning heads of the present invention; Figure 8It is a schematic structural diagram of the frustum-shaped cleaning head of the present invention; Reference numerals in the figure: 1, sampling and detection device; 2, sampling tube; 3, cleaning rod; 301, outer rod; 302, inner rod; 31, cleaning head; 32, cleaning blade; 331, rotating plate; 332, guiding channel; 333, convex block; 34, first push-pull rod; 35, duct; 41, base column; 42, elastic layer; 43, second diameter-changing adjustment structure; 44, second push-pull rod; 45, arc-shaped attaching plate; 46, sleeve; 47, rib; 51, rotating motor; 52, output shaft; 521, internal teeth; 522, external teeth; 53, first receiving gear sleeve; 54, second receiving gear sleeve; 55, driving lead screw; 56, ear seat; 57, limiting plate; 58, electric bolt; 59, convex plate; 6, spiral notch; 7, through hole; 81, storage bin; 811, first opening; 812, second opening; 82, converging cavity; 83, scraping plate. Specific embodiments

[0018] The embodiments of the present invention will be described below with reference to the accompanying drawings in the embodiments of the present invention. The terms used in the embodiments of the present invention are only used to explain the specific embodiments of the present invention, rather than to limit the present invention. The embodiments of the present application will be described below with reference to the accompanying drawings.

[0019] Embodiment 1, referring to Figure 1 - Figure 2 As shown, a flue gas sampler with an automatic ash and coke removal function includes a sampling and detection device 1 and a sampling tube 2 installed on the sampling and detection device 1 for sampling gas. Both can be adopted in the existing technology. Among them, a certain space needs to be set in the sampling and detection device 1 for storing the cleaning mechanism, and a cleaning mechanism is installed in the sampling and detection device 1; the cleaning mechanism includes a cleaning rod 3, a retracting component and a driving component; one end of the cleaning rod 3 extending into the sampling tube 2 is the distal end, and at least one cleaning head 31 is coaxially installed at the distal end of the cleaning rod 3. A plurality of cleaning blades 32 are installed on the outer surface of the cleaning head 31 along the circumferential direction. A first diameter-changing adjustment structure is installed in the cleaning head 31, and a first push-pull rod 34 is correspondingly arranged between the first diameter-changing adjustment structure and each cleaning blade 32. The first diameter-changing adjustment structure is configured to control the cleaning blade 32 to approach or move away from the outer surface of the cleaning head 31 along the radial direction through the first push-pull rod 34; the retracting component is installed at one end of the cleaning head 31 farthest from the cleaning rod 3, and the working radius of the retracting component is not less than the outer diameter formed by the combination of the cleaning head 31 and the cleaning blades 32; the driving component is installed in the sampling and detection device 1 and is connected to the proximal end of the sampling tube 2. The driving component is configured to: Control the cleaning rod 3 to extend into the sampling tube 2 or disengage from the sampling tube 2 and enter the sampling and detection device 1; Control the cleaning rod 3 to rotate, or control the radial adjustment of the diameter-changing adjustment structure to work.

[0020] In this embodiment, the cleaning mechanism takes a single cleaning head 31 as an example. Refer to Figure 2 and 3 As shown, at one end (i.e., the distal end) of the cleaning rod 3, a cleaning head 31 and a push-back assembly are coaxially arranged; Among them, for the first variable-diameter adjustment structure, it can control the cleaning blade 32 to approach or move away from the outer surface of the cleaning head 31 according to requirements through the first push-pull rod 34; in this embodiment, a method is given. Refer to Figure 4 - Figure 5 As shown, the first variable-diameter adjustment structure includes a rotating plate 331, and guiding channels 332 are arranged on the rotating plate 331 corresponding to each first push-pull rod 34; one end of the guiding channel 332 is close to the center of the rotating plate 331, and the other end is close to the edge of the rotating plate 331, which can be set in the way of Figure 5 ; A convex block 333 is arranged on the first push-pull rod 34, and the convex block 333 is inserted into the corresponding guiding channel 332; when the rotating plate 331 is configured to rotate, it controls the relative position of the convex block 333 in the guiding channel 332, drives the first push-pull rod 34 to move radially, and at the same time drives the cleaning blade 32 to move radially.

[0021] Among them, corresponding holes 35 are arranged along the diameter on the cleaning head 31 for installing the first push-pull rod 34. Based on the above, when the rotating plate 331 rotates, since the first push-pull rod 34 can only move radially, at this time, when the rotating plate 331 rotates, the relative position of the convex block 333 in the guiding channel 332 changes, which will squeeze the convex block 333 to make the first push-pull rod 34 move radially; taking Figure 5 as an example, when rotating to the right, it can drive the first push-pull rod 34 to move radially outward, control the cleaning blade 32 to move away from the outer surface of the cleaning head 31, and when rotating to the left, it can drive the first push-pull rod 34 to move radially inward, control the cleaning blade 32 to approach the outer surface of the cleaning head 31.

[0022] Refer to Figure 4 and Figure 6 As shown, the relevant structure of the push-back assembly is shown, including: A base column 41, the base column 41 is coaxially installed at one end of the cleaning head 31 at the farthest end away from the cleaning rod 3, and the diameter of the base column 41 is not greater than the end face diameter of the cleaning rod 3; An elastic layer 42, arranged on the circumferential outer side of the base column 41; A second variable-diameter adjustment structure 43, installed in the base column 41, and the structure of the second variable-diameter adjustment structure 43 is the same as that of the first variable-diameter adjustment structure. A plurality of second push-pull rods 44 are correspondingly arranged between the second variable-diameter adjustment structure 43 and the elastic layer 42. The second variable-diameter adjustment structure 43 is configured to control the elastic layer 42 to deform and bulge to expand radially or reset along the radial direction through the second push-pull rods 44. Among them, the deformation state of the elastic layer 42 is the working state.

[0023] The structure and working method of the second variable diameter adjustment structure 43 are the same as those of the first variable diameter adjustment structure. The second push-pull rod 44 is set at the center position of the elastic layer 42 along the axial direction of the base column 41. When the second variable diameter adjustment structure 43 is used to control the second push-pull rod 44 to extend outward, the center of the elastic layer 42 can be pushed to deform, thereby bulging outward until it contacts the inner wall of the sampling tube 2. In this way, when the sampling tube 2 retracts to the sampling detection device 1, the impurities cleaned by the cleaning blade 32 can be taken out together.

[0024] Furthermore, an arc-shaped plate 45 may be provided at the end of each second push-pull rod 44, and the arc-shaped plate 45 is connected to the central area of the elastic layer 42 to increase the force-bearing area of the elastic layer 42, so that the deformation is more uniform, and the outward protrusion and the existence of pores to cause impurity leakage are avoided. The arc-shaped plates 45 may be arranged at intervals or overlapped, so as to achieve an effective protruding structure of the extruded elastic layer 42; refer to Figure 6 As shown, a circle of convex strips 47 can be provided on the outer side of the elastic layer 42 at a position corresponding to the arc-shaped contact plate 45 so that it can fully contact the inner wall of the sampling tube 2.

[0025] For further reference, Figure 3 and Figure 6 As shown, sleeves 46 are provided at both ends of the elastic layer 42, and the sleeves 46 are sleeved on the base column 41. As the elastic layer 42 is deformed or reset, the sleeves 46 slide along the base column 41 accordingly. When the second push-pull rod 44 squeezes the elastic layer 42, the two ends of the elastic layer 42 can slide toward the center to form a bulge, thereby reducing the elastic fatigue of the elastic layer 42 and increasing the service life.

[0026] For controlling the rotation of the cleaning rod 3, or controlling the radial adjustment of the variable diameter adjustment structure; refer to Figure 1 and Figure 7 As shown, the cleaning rod 3 includes an outer rod 301 and an inner rod 302 which are coaxially arranged. The distal end of the outer rod 301 is connected to the cleaning head 31, and the distal end of the inner rod 302 is connected to the rotary plate 331. The proximal end of the inner rod 302 extends out of the proximal end of the outer rod 301. The driving assembly includes a rotary motor 51. The rotary motor 51 has an output shaft 52. The output shaft 52 is cylindrical, and the inner surface of the cylindrical output shaft 52 is provided with internal teeth 521, and the outer surface of the cylindrical output shaft 52 is provided with external teeth 522. The proximal end of the outer rod 301 is installed with a first receiving gear sleeve 53, and the proximal end of the inner rod 302 is installed with a second receiving gear sleeve 54. The output shaft 52 is meshed with the second receiving gear sleeve 54 through the inner teeth 521, and the outer teeth 522 are disengaged from the first receiving gear sleeve 53, so that the inner rod 302 can be driven by the rotating motor 51, thereby driving each rotating plate 331 to rotate; The output shaft 52 meshes with the first receiving gear sleeve 53 through the external teeth 522, and the internal teeth 521 are disengaged from the second receiving gear sleeve 54. Then, the external rod 301 can be driven by the rotating motor 51, thereby driving each cleaning head 31 to rotate. For the control of the cleaning rod 3 extending into the sampling tube 2 or disengaging from the sampling tube 2 and entering the sampling and detection device 1, refer to Figure 1 As shown, in this embodiment, a driving lead screw 55 is arranged along the axis direction of the sampling tube 2 in the sampling and detection device 1. In this embodiment, a pair of driving lead screws 55 are provided, distributed on both sides of the rotating motor 51. Nut structures are configured on both sides of the rotating motor 51 through ear seats 56 and meshed and connected to the corresponding driving lead screws 55. As the lead screws rotate, the linear movement of the rotating motor 51 can be controlled. For the rotation of the lead screws, a corresponding lead screw motor can be configured to drive, ensuring that the two driving lead screws 55 rotate synchronously to achieve the stable movement of the rotating motor 51. Alternatively, one driving lead screw 55 can be used in cooperation with a guide rod. A sleeve 46 is configured on the corresponding side of the rotating motor 51 through an ear seat 56 and sleeved on the guide rod.

[0027] In this embodiment, the rotation of the driving lead screw 55 can be used to control the movement of the rotating motor 51. At this time, the output shaft 52 is inserted into the first receiving gear sleeve 53, pushing the cleaning rod 3 to move synchronously and sending the cleaning head 31 to the designated position. Then, the driving lead screw 55 is controlled to rotate in the reverse direction, and the driving motor is retracted by a preset distance. At this time, it is the variable diameter position. The output shaft 52 is controlled to mesh with the second receiving gear sleeve 54 through the internal teeth 521, and the external teeth 522 are disengaged from the first receiving gear sleeve 53. At this time, the rotating motor 51 rotates, controlling the inner rod 302 to rotate. The cleaning blade 32 is expanded to the designated position through the first variable diameter adjustment structure. At the same time, the second variable diameter adjustment structure 43 controls the elastic layer 42 to bulge to the designated position. The driving lead screw 55 is controlled to rotate forward, and the driving motor is fed to the original position, which is the cleaning position. At this time, the output shaft 52 meshes with the first receiving gear sleeve 53 through the external teeth 522, and the internal teeth 521 are disengaged from the second receiving gear sleeve 54, and the rotation of the cleaning head 31 can be controlled. When a region is cleaned, the cleaning rod 3 is retracted. Refer to Figure 2 As shown, a limiting plate 57 is arranged inside the output shaft 52 and the inner rod 302. When the driving lead screw 55 controls the driving motor to retract to the variable diameter position, it prevents the output shaft 52 from further disengaging from the inner rod 302 and can drive the inner rod 302 and the external rod 301 to retract synchronously. The inner rod 302 and the external rod 301 are connected by existing methods such as bearings to achieve independent rotation and synchronous linear movement. When the cleaning head 31 retracts to the next position, the position adjustment can be performed as described above to carry out the next cleaning work. Optionally, an electric plug 58 can also be arranged at the proximal end of the external rod 301. Refer to Figure 2As shown in the figure, a convex plate 59 is provided outside the output shaft 52. After the diameter adjustment, the electric bolt 58 is activated and inserted into the corresponding side of the convex plate 59, so that the output shaft 52 can be locked in the first receiving gear sleeve 53. When retracting, the above state is maintained to achieve continuous operation of rotating and cleaning while retracting. It is not limited to setting the electric bolt 58, and the above locking function can be achieved by using the existing technology.

[0028] Embodiment 2, on the basis of Embodiment 1, referring to Figure 3 As shown in the figure, in this embodiment, the cleaning blade 32 has a spiral section structure, and a spiral groove 6 is provided on the outer surface of the cleaning head 31 corresponding to the cleaning blade 32. The spiral groove 6 is used to accommodate the cleaning blade 32. In this embodiment, through the cleaning blade 32 with a spiral section structure, during the cleaning process, the impurities in the cleaning process can be automatically conveyed to a specified side, for example, conveyed towards the sampling and detecting device 1. Since the diameter of the cleaning rod 3 is smaller than the diameter of the unfolded cleaning head 31, it is convenient to temporarily store impurities and avoid the accumulation of impurities between the cleaning blade 32 and the retracting component, which affects the rotation and retracting operations. The setting of the spiral groove 6 can better accommodate the cleaning blade 32.

[0029] Embodiment 3, on the basis of Embodiment 2, referring to Figure 7 As shown in the figure, at least two cleaning heads 31 are coaxially installed at the distal end of the cleaning rod 3, and the cleaning blades 32 corresponding to the strict axis direction on each cleaning head 31 are arranged in a spiral manner, which can not only increase the area of the cleaning area at one time, but also form a similar auger conveying method through each cleaning blade 32 when multiple cleaning heads 31 rotate, and push the impurities towards the sampling and detecting device 1.

[0030] Embodiment 4, on the basis of Embodiment 1, referring to Figure 8 As shown in the figure, the cleaning head 31 has a frustum structure, and the plane with a smaller diameter is defined as the top surface. The top surface of the frustum structure faces the sampling and detecting device 1. Each cleaning blade 32 is inclined along the side surface of the frustum structure. The cleaning head 31 and each cleaning blade 32 are arranged in a frustum structure to realize the cleaning process during expansion, and the inner wall of the pipe is cleaned in a gradually expanding and deepening manner to avoid situations such as the cleaning head 31 being blocked too much and getting stuck.

[0031] Embodiment 5, on the basis of Embodiments 1-4, referring to Figure 1 - Figure 2 As shown in the figure, a through hole 7 is provided at the connection between the sampling and detecting device 1 and the sampling pipe 2; the through hole 7 is used to provide the cleaning rod 3 to extend or enter the sampling and detecting device 1; a receiving mechanism is provided in the sampling and detecting device 1, and the receiving mechanism includes: A receiving bin 81 is provided at the bottom of the sampling and detecting device 1. The first opening 811 of the receiving bin 81 corresponds to the outside of the through hole 7, and the second opening 812 of the receiving bin 81 corresponds to the inside of the through hole 7; The converging cavity 82 is arranged outside the through hole 7. The converging cavity 82 is used to guide impurities outside the through hole 7 into the first opening 811; The scraping plate 83 is arranged inside the through hole 7 and is coaxially arranged with the through hole 7. The scraping plate 83 is used to scrape impurities on the cleaning rod 3; and an independent space communicating with the second opening 812 is divided inside the through hole 7; In this embodiment, as the cleaning rod 3 retracts, the impurities to be cleaned first enter the converging cavity 82, fall into the first opening 811 along the converging cavity 82, and then pass through the first opening 811 and enter the storage bin 81; when the cleaning head 31 retracts to the converging cavity 82, the cleaning head 31 can be rotated to throw the impurities on the cleaning head 31 and in the areas of the cleaning blades 32 into the converging cavity 82; after the cleaning is completed, the cleaning blades 32 can be controlled to reset; then as the cleaning rod 3 retracts, the scraping plate 83 can further scrape the impurities on the cleaning rod 3 and the cleaning head 31, and the scraped impurities enter the storage bin 81 through the second opening 812, ensuring that the cleaning rod 3 retracts into the sampling and detecting device 1 in a clean state.

[0032] The embodiments of the present invention have been described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the above embodiments. For those of ordinary skill in the art in this technical field, after learning the content recorded in the present invention, without departing from the principle of the present invention, several equivalent transformations and substitutions can still be made, and these equivalent transformations and substitutions should also be regarded as belonging to the protection scope of the present invention.

Claims

1. A flue gas sampler with an automatic ash and coke removal function, comprising a sampling and detection device and a sampling tube installed on the sampling and detection device for sampling gas, characterized in that: A cleaning mechanism is installed inside the sampling and detection device; the cleaning mechanism includes: A cleaning rod, one end of the cleaning rod extending into the sampling tube is the distal end, at least one cleaning head is coaxially installed at the distal end of the cleaning rod, several cleaning blades are installed on the outer surface of the cleaning head along the circumferential direction, a first variable diameter adjustment structure is installed inside the cleaning head, and the first variable diameter adjustment structure and each cleaning blade are respectively provided with a first push-pull rod, and the first variable diameter adjustment structure is configured to control the cleaning blade to approach or move away from the outer surface of the cleaning head along the radial direction through the first push-pull rod; A retraction assembly, installed at one end of the cleaning head at the farthest end away from the cleaning rod, and the working state radius of the retraction assembly is not less than the outer diameter formed by the combination of the cleaning head and the cleaning blades; A driving assembly, installed inside the sampling and detection device and connected to the proximal end of the sampling tube, and the driving assembly is configured to: Control the cleaning rod to extend into the sampling tube or disengage from the sampling tube and enter the sampling and detection device; Control the cleaning rod to rotate or control the radial adjustment operation of the variable diameter adjustment structure.

2. The flue gas sampler with an automatic ash and coke removal function according to claim 1, characterized in that: The first variable diameter adjustment structure includes a rotating plate, and guiding channels are respectively arranged on the rotating plate corresponding to each first push-pull rod; one end of the guiding channel is close to the center of the rotating plate, and the other end is close to the edge of the rotating plate; A convex block is arranged on the first push-pull rod, and the convex block is inserted into the corresponding guiding channel; when the rotating plate is configured to rotate, it controls the relative position of the convex block in the guiding channel, drives the first push-pull rod to move radially, and simultaneously drives the cleaning blade to move radially.

3. The flue gas sampler with an automatic ash and coke removal function according to claim 1 or 2, characterized in that: The retraction assembly includes: A base column, the base column is coaxially installed at one end of the cleaning head at the farthest end away from the cleaning rod, and the diameter of the base column is not greater than the end face diameter of the cleaning rod; An elastic layer, arranged on the outer side of the circumference of the base column; A second variable diameter adjustment structure, installed inside the base column, and the second variable diameter adjustment structure is the same as the first variable diameter adjustment structure, a plurality of second push-pull rods are respectively arranged between the second variable diameter adjustment structure and the elastic layer, and the second variable diameter adjustment structure is configured to control the elastic layer to deform and bulge to expand or reset along the radial direction through the second push-pull rod, wherein the deformed state of the elastic layer is the working state.

4. The flue gas sampler with an automatic ash and coke removal function according to claim 3, characterized in that: Both ends of the elastic layer are provided with sleeves, and the sleeves are sleeved on the base column, and slide along the base column correspondingly as the elastic layer deforms or resets.

5. The flue gas sampler with an automatic ash and coke removal function according to claim 3, characterized in that: An arc-shaped attaching plate is arranged at the end of each second push-pull rod, and the arc-shaped attaching plate is connected to the central area of the elastic layer; and A circle of convex strips is arranged at the position corresponding to the arc-shaped attaching plate on the outer side of the elastic layer.

6. The flue gas sampler with an automatic ash and coke removal function according to claim 2, characterized in that: The cleaning rod includes an outer rod and an inner rod arranged coaxially, the distal end of the outer rod is connected to the cleaning head, and the distal end of the inner rod is connected to the rotating plate; The driving assembly includes: A rotating motor, having an output shaft, the output shaft is cylindrical, and internal teeth are arranged on the inner surface of the cylindrical output shaft, and external teeth are arranged on the outer surface of the cylindrical output shaft; a first receiving gear sleeve is installed at the proximal end of the outer rod, and a second receiving gear sleeve is installed at the proximal end of the inner rod; At least one driving lead screw along the axis direction of the sampling tube, the rotating motor is assembled on the driving lead screw through a nut, and when the driving lead screw is configured to rotate, it drives: The rotating electric machine moves along the rotating electric machine; The output shaft meshes with the second receiving gear sleeve through internal teeth and disengages from the first receiving gear sleeve through external teeth; or the output shaft meshes with the first receiving gear sleeve through external teeth and disengages from the second receiving gear sleeve through internal teeth.

7. The flue gas sampler with an automatic ash and coke removal function according to claim 1, characterized in that: The cleaning blade has a spiral section structure, and a spiral notch is provided at a position corresponding to the cleaning blade on the outer surface of the cleaning head, and the spiral notch is used to accommodate the cleaning blade.

8. The flue gas sampler with an automatic ash and coke removal function according to claim 7, characterized in that: At least two cleaning heads are coaxially installed at the distal end of the cleaning rod, and the cleaning blades corresponding to each cleaning head in the axial direction are arranged in a spiral manner.

9. A flue gas sampler with an automatic ash and coke removal function according to claim 1, 7 or 8, characterized in that: The cleaning head has a frustum structure, and the plane with a smaller diameter is defined as the top surface. The top surface of the frustum structure faces the sampling and detection device, and each cleaning blade is inclined along the side surface of the frustum structure.

10. A flue gas sampler with an automatic ash and coke removal function according to claim 1, characterized in that: A through hole is provided at the connection between the sampling and detection device and the sampling tube; a receiving mechanism is provided in the sampling and detection device, and the receiving mechanism includes: A receiving bin is provided at the bottom of the sampling and detection device. The first opening of the receiving bin corresponds to the outside of the through hole, and the second opening of the receiving bin corresponds to the inside of the through hole; A converging cavity is provided outside the through hole, and the converging cavity is used to guide impurities outside the through hole into the first opening; A scraping plate is provided inside the through hole and is coaxially arranged with the through hole. The scraping plate is used to scrape impurities on the cleaning rod; and an independent space communicating with the second opening is divided inside the through hole.

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