A pneumatic decoking device for fire detection probe and a decoking method thereof

Abstract

The application discloses a kind of pyrometer probe is used pneumatic decoking device and its decoking method, setting in probe interior, comprising: receiving cavity, multiple groups and evenly annular distribution in the detection part of probe peripheral side, the hammer and connecting rod mechanism are equipped in the receiving cavity;Pneumatic cavity, with each the receiving cavity one-to-one corresponding and adjacent setting, pneumatic slider is arranged in the pneumatic cavity, and the connecting rod mechanism is fixedly connected with the connecting rod mechanism by the connecting rod that passes through the wall body between pneumatic cavity and receiving cavity.This application, without stopping furnace, can automatically shake and blow cleaning to pyrometer probe, avoid the risk of pyrometer signal attenuation and boiler trip due to coking, guarantee the continuous safe operation of boiler;With boiler field compressed air as power source, through pneumatic slider to advance connecting rod mechanism to extend, pneumatic rotary ring drives hammer to shake, cleaning air flow is synchronously blown, without external motor or complex transmission component, reduce sealing leakage point and fault point.

Description

Technical Field

[0001] This invention relates to the field of thermal power plant decoking devices, and in particular to a pneumatic decoking device and method for a fire detector probe. Background Technology

[0002] In the combustion system of a thermal power plant boiler, the flame detector is a key device for ensuring the safe and stable operation of the boiler, often referred to as the boiler's "eyes." The flame detector probe detects the ultraviolet or infrared light signals of the flame inside the furnace to determine the burner's ignition status in real time, and is a core input component of the boiler fire suppression system (FSSS). An abnormal flame detector signal may trigger a main fuel trip (MFT), leading to unplanned shutdowns and significant economic losses.

[0003] However, the working environment of flame detector probes is extremely harsh. The temperature inside the furnace reaches over 1000℃, and the fly ash produced by pulverized coal combustion is in a molten or semi-molten state at this high temperature. This easily adheres to the surface of the lens or light guide at the tip of the flame detector probe, forming a hard coking layer. This coking layer blocks or refracts the flame signal entering the probe, leading to decreased flame detection intensity, signal fluctuations, or even complete signal loss. Furthermore, the high temperature inside the furnace accelerates the aging of the probe's optical fiber and electronic components, further reducing equipment reliability. In actual operation, poor flame detection due to burner coking affecting the flame detector probe's line of sight is very common. Because there is no water-cooled wall at the flame detector probe orifice, the temperature is high, and fly ash easily adheres in its molten state, forming a large area of ​​coking centered on the probe orifice.

[0004] Currently, the decoking methods for fire detector probes mainly suffer from the following problems: (1) Manual shutdown cleaning. The traditional method requires maintenance personnel to enter the furnace or set up scaffolding to manually clean the coke after the boiler is shut down. This method is not only labor-intensive and dangerous (high temperature, dust, high altitude), but also has a long cleaning cycle and cannot be carried out during boiler operation. For units that need to participate in peak shaving frequently, shutdown cleaning seriously affects power generation efficiency.

[0005] (2) Single purging or cooling air protection. Some solutions attempt to prevent fly ash from adhering by continuously supplying cooling air or compressed air to the probe surface. However, purging alone is insufficient to remove the hardened coking layer that has already formed, and the cooling air system itself has problems such as high energy consumption and fan failure.

[0006] (3) Mechanical tapping or scraping device. A few solutions use a motor-driven tapping assembly to break up the coking on the probe surface. However, such devices usually require an external power source and a complex transmission mechanism, are bulky, and the vibration generated during the tapping process may damage the precision components inside the probe.

[0007] (4) Lack of online, non-destructive, integrated coking removal solution. There is currently a lack of an automatic coking removal device that can perform online coking removal on the flame detector probe during normal boiler operation without shutting down the boiler, and that integrates rapping and purging functions, has a compact structure, and does not require a complex external power source.

[0008] Therefore, there is an urgent need for a fire detector probe decoking device that can achieve online automatic decoking, has both vibration crushing and blowing cleaning functions, has a compact structure, and does not require an external independent power source. Summary of the Invention

[0009] The purpose of this invention is to address the shortcomings mentioned above by providing a pneumatic descaling device and method for fire detector probes, which achieves online automatic descaling and also has the functions of vibration crushing and blowing cleaning.

[0010] To solve the above-mentioned technical problems, the present invention adopts the following technical solution: a pneumatic decoking device for a fire detector probe, disposed inside the probe, comprising: The receiving cavity is arranged in multiple groups and evenly distributed in a ring around the detection part of the probe. The receiving cavity is equipped with a hammer and a linkage mechanism. A pneumatic cavity is provided, which corresponds to and is adjacent to each of the storage cavities. A pneumatic slider is provided in the pneumatic cavity. The pneumatic slider is fixedly connected to the linkage mechanism through a connecting rod that passes through the wall between the pneumatic cavity and the storage cavity. An air supply mechanism is used to supply air into the pneumatic cavity to drive the pneumatic slider to reciprocate. The pneumatic slider drives the linkage mechanism to switch between a working posture and a retracted posture through the connecting rod. The linkage mechanism has a retracted posture that is retracted into the retracted cavity and a working posture that extends outward to align the hammer with the surface of the detection part. The pneumatic slider has a connecting air passage, and the receiving cavity has a cleaning air passage. When the pneumatic slider moves to its working position, the connecting air passage is connected to the cleaning air passage. A pneumatic rotating ring is rotatably disposed inside the probe and located inside the receiving cavity. The inner wall of the pneumatic rotating ring is provided with a transmission blade corresponding to the outlet end of the cleaning air passage. The outer surface of the pneumatic rotating ring is provided with a transmission corrugated groove. When the air supply mechanism supplies air to the pneumatic cavity and the connecting air passage is connected to the cleaning air passage, the airflow flows out through the cleaning air passage and impacts the transmission blades, driving the pneumatic rotating ring to rotate. The transmission corrugated groove drives the linkage mechanism in the working posture to move, so that the hammer vibrates and removes slag from the surface of the detection part.

[0011] Furthermore, the linkage mechanism includes a first link, a second link, and a hinge shaft connecting the two; The first connecting rod is provided with a first telescopic locking pin, and the end of the first connecting rod is fixedly connected to the hammer; The bottom of the second connecting rod is provided with a second telescopic pin. The second connecting rod is a sleeve structure that can extend and retract along its axial direction. When the connecting rod mechanism is in the working position, the second telescopic pin cooperates with the transmission corrugated groove.

[0012] Furthermore, a guide groove is provided inside the receiving cavity. The guide groove is used to cooperate with the first telescopic pin during the outward extension of the linkage mechanism to guide the first linkage to rotate around the hinge axis, so that the hammer tilts toward the surface of the detection part.

[0013] Furthermore, the probe has a rotating cavity corresponding to the pneumatic rotating ring, the rotating cavity is located inside the receiving cavity, and bearing balls are provided between the pneumatic rotating ring and the inner wall of the rotating cavity; The transmission blades are inclinedly arranged on the outlet path of the cleaning air passage, and the transmission corrugated groove is a circumferential groove that undulates in a wave shape along the axis of the pneumatic rotating ring. When the pneumatic rotating ring rotates, the transmission corrugated groove drives the second connecting rod to reciprocate along its axial direction through the second telescopic pin housed therein, and drives the first connecting rod to swing periodically around the first telescopic pin as a fulcrum through the hinge shaft, so that the hammer strikes the surface of the detection part.

[0014] Furthermore, the air supply mechanism includes a first air supply line and a second air supply line respectively connected to both ends of the pneumatic cavity, and the pneumatic cavity and the pneumatic slider are in dynamic sealing cooperation; When the first air supply line supplies air, it pushes the pneumatic slider to move to its working position in the first direction, causing the linkage mechanism to switch to the working posture, and at the same time the connecting air passage is connected to the cleaning air passage. When the second air supply line supplies air, it pushes the pneumatic slider to move in the second direction to its storage position, causing the linkage mechanism to switch to the storage posture, and the connecting air passage is disconnected from the cleaning air passage.

[0015] Furthermore, the probe is also provided with an exhaust pipe, one end of which is connected to the cleaning air passage, and the other end is connected to the exhaust hole between adjacent receiving cavities. The exhaust port is equipped with a guide nozzle, which is used to guide the airflow obliquely to the surface of the detection part to blow away the rubber shell debris that has been shaken off.

[0016] Another technical solution described in this application is a method for removing char from a flame detector probe, using the pneumatic char removal device for a flame detector probe as described in any one of claims, comprising the following steps: S1: The air supply mechanism supplies air to the pneumatic cavity, driving the pneumatic slider to move in the first direction. The connecting rod pushes the linkage mechanism to switch from the storage posture to the working posture, so that the hammer is aligned with the surface of the detection part. S2: When the pneumatic slider moves to the working position, the connecting air passage is connected to the cleaning air passage. The airflow flows out through the cleaning air passage and impacts the transmission blades, driving the pneumatic rotating ring to rotate. S3: The pneumatic rotating ring drives the linkage mechanism through the transmission corrugated groove on its outer surface, causing the hammer to periodically vibrate the surface of the detection part and break the rubber shell. S4: The airflow enters the exhaust pipe through the cleaning air passage and is sprayed out from the guide nozzle of the exhaust hole, blowing away the rubber shell debris that has been shaken off from the surface of the detection part. S5: The air supply mechanism stops supplying air or switches to the second air supply line. The pneumatic slider moves to the second direction to reset. The linkage mechanism switches to the storage posture, and the connecting air passage and the cleaning air passage are disconnected.

[0017] The beneficial effects of this invention are reflected in: This invention enables automatic vibration and purging cleaning of flame detector probes without shutting down the boiler, avoiding signal attenuation and boiler tripping risks caused by coking, thus ensuring continuous and safe boiler operation. Powered by compressed air from the boiler site, the invention utilizes a pneumatic slider to extend a linkage mechanism, a pneumatic rotating ring to drive a hammer for vibration, and simultaneous purging of the cleaning air passages. This eliminates the need for external motors or complex transmission components, reducing potential leaks and malfunctions. The vibration force is precisely controlled by pneumatic pressure and the amplitude of the corrugated grooves, preventing mechanical damage during manual coking and extending probe lifespan. This invention replaces manual coking cleaning operations in high-temperature, high-risk environments, reducing labor intensity and safety hazards, and improving the level of automated operation and maintenance in thermal power plants. Attached Figure Description

[0018] Figure 1 This is a cross-sectional view of the structure of the present invention; Figure 2 This is a cross-sectional view of the storage structure of the present invention; Figure 3 For the present invention Figure 2 Enlarged schematic diagram of the structure at point A in the middle; Figure 4 This is an external view of the structure of the present invention.

[0019] In the picture: 1. Probe; 11. Detection section; 2. Receiving cavity; 21. Guide groove; 3. Hammer; 4. Linkage mechanism; 41. First link; 411. First telescopic pin; 42. Second link; 421. Second telescopic pin; 43. Hinge shaft; 5. Pneumatic cavity; 51. First air supply line; 52. Second air supply line; 53. Cleaning air passage; 531. Exhaust line; 532. Exhaust port; 6. Pneumatic slider; 61. Connecting air passage; 7. Pneumatic rotating ring; 71. Transmission blade; 72. Transmission corrugated groove. Detailed Implementation

[0020] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of them. Unless otherwise specified, the embodiments and features in the embodiments of this application can be combined with each other. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0021] This invention discloses as follows Figures 1 to 4 As shown, this embodiment provides a pneumatic decoking device that integrates rapping and purging for flame detector probes, mainly used for online automatic decoking of flame detector probes in thermal power plant boilers.

[0022] The decoking device of the present invention is located inside the probe 1 and mainly consists of a receiving cavity 2, a pneumatic cavity 5, an air supply mechanism, a pneumatic rotating ring 7, a connecting rod mechanism 4, and a hammer 3, forming a three-in-one online decoking solution of "pneumatic propulsion + vibration crushing + blowing cleaning".

[0023] The number of receiving cavities 2 is multiple, evenly distributed in a ring around the detection part 11 of the probe 1. The receiving cavities 2 are evenly arranged along the circumference of the probe 1, preferably in 3 to 6 groups. The receiving cavity 2 is a strip-shaped cavity extending along the axial direction of the probe 1, and its internal space is used to accommodate the hammer 3 and the linkage mechanism 4.

[0024] The storage cavity 2 has guide grooves 21 on both sides. The guide grooves 21 are inclined channels extending along the length of the storage cavity 2. Their function is to guide the swing direction of the first connecting rod 41 during the outward extension of the connecting rod mechanism 4, so that the first connecting rod 41 at each angle deflects toward the center of the detection part 11 after extension.

[0025] The linkage mechanism 4 is disposed in the receiving cavity 2 and includes a first link 41, a second link 42, and a hinge shaft 43 connecting the two. The first link 41 and the second link 42 are hinged to each other through the hinge shaft 43, and the two can rotate relative to each other around the hinge shaft 43.

[0026] One end of the first connecting rod 41 (i.e., the end closest to the detection section 11) is fixedly connected to the hammer 3. A first telescopic locking pin 411 is provided in the middle of the first connecting rod 41 or near the hinge shaft 43. The first telescopic locking pin 411 is a telescopic pin structure that can extend or retract radially along the first connecting rod 41. When the connecting rod mechanism 4 extends outward, the first telescopic locking pin 411 extends and engages with the guide groove 21 on the inner wall of the receiving cavity 2. The first telescopic locking pin 411 slides along the guide groove 21, and the inclination direction of the guide groove 21 guides the first connecting rod 41 to rotate around the hinge shaft 43, causing the hammer 3 to tilt toward the surface of the detection section 11, ensuring that the hammer 3 can accurately act on the coking layer on the surface of the detection section 11.

[0027] One end of the second connecting rod 42 (i.e., the end furthest from the detection unit 11) is fixedly connected to the connecting rod of the pneumatic slider 6. The second connecting rod 42 is a sleeve structure that can extend and retract along its axial direction. A second telescopic locking pin 421 is provided at the bottom of the second connecting rod 42 (i.e., the end near the pneumatic rotating ring 7). The second telescopic locking pin 421 is also a telescopic pin structure. When the connecting rod mechanism 4 is in the working position, the second telescopic locking pin 421 extends out and is accommodated in the transmission corrugated groove 72 on the outer surface of the pneumatic rotating ring 7.

[0028] The pneumatic cavity 5 corresponds one-to-one with each of the receiving cavities 2 and is arranged adjacent to each other, that is, each receiving cavity 2 corresponds to one pneumatic cavity 5. A pneumatic slider 6 is provided inside the pneumatic cavity 5, and the pneumatic slider 6 is dynamically sealed with the inner wall of the pneumatic cavity 5, dividing the pneumatic cavity 5 into two independent chambers.

[0029] The pneumatic slider 6 is fixedly connected to the second link 42 of the linkage mechanism 4 via a connecting rod that passes through the wall between the pneumatic cavity 5 and the receiving cavity 2. When the pneumatic slider 6 reciprocates within the pneumatic cavity 5, it drives the second link 42 to move synchronously via the connecting rod, thereby driving the entire linkage mechanism 4 to extend or retract.

[0030] The pneumatic slider 6 has a connecting air passage 61. The connecting air passage 61 is a channel that passes through the pneumatic slider 6, and its function is to introduce the airflow of the air supply mechanism into the cleaning air passage 53 when the pneumatic slider 6 moves to a specific position.

[0031] The air supply mechanism is used to supply air into the pneumatic cavity 5 to drive the pneumatic slider 6 to reciprocate. The air supply mechanism includes a first air supply pipe 51 and a second air supply pipe 52 respectively connected to the two ends of the pneumatic cavity 5.

[0032] When the first air supply line 51 supplies air, compressed air enters one end of the pneumatic chamber 5 (e.g., the end near the receiving chamber 2), pushing the pneumatic slider 6 to move in the first direction (e.g., away from the receiving chamber 2). The pneumatic slider 6 pushes the second connecting rod 42 through the connecting rod, causing the linkage mechanism 4 to switch from the receiving posture to the working posture. When the pneumatic slider 6 moves to its limit position in the first direction (i.e., the working position), the linkage mechanism 4 is fully extended, and the hammer 3 is aligned with the surface of the detection part 11. At this time, the connecting air passage 61 on the pneumatic slider 6 is exactly connected to the cleaning air passage 53 in the receiving chamber 2.

[0033] When the second air supply line 52 supplies air, compressed air enters the other end of the pneumatic chamber 5, pushing the pneumatic slider 6 to move in the second direction (such as towards the receiving chamber 2). The pneumatic slider 6 pulls the second connecting rod 42 through the connecting rod, causing the linkage mechanism 4 to switch from the working posture to the receiving posture. When the pneumatic slider 6 moves to its limit position in the second direction (i.e., the receiving position), the linkage mechanism 4 is completely retracted into the receiving chamber 2, and the connecting air passage 61 is disconnected from the cleaning air passage 53.

[0034] A cleaning air passage 53 is provided inside the receiving cavity 2. One end of the cleaning air passage 53 opens into the inner wall of the receiving cavity 2. When the pneumatic slider 6 is in the working position, the connecting air passage 61 is connected to the cleaning air passage 53. The other end of the cleaning air passage 53 extends to the vicinity of the inner side wall of the pneumatic rotating ring 7, forming an outlet end.

[0035] The pneumatic rotating ring 7 is rotatably mounted inside the probe 1, located inside the receiving cavity 2. The probe 1 has a rotating cavity corresponding to the pneumatic rotating ring 7, and the pneumatic rotating ring 7 is installed in the rotating cavity. Bearing balls are provided between the pneumatic rotating ring 7 and the inner wall of the rotating cavity to ensure that the pneumatic rotating ring 7 can rotate freely.

[0036] A drive blade 71 is provided on the inner wall of the pneumatic rotating ring 7. The drive blade 71 is inclinedly arranged on the outlet path of the cleaning air passage 53, that is, the airflow from the cleaning air passage 53 directly impacts the surface of the drive blade 71. Since the drive blade 71 is inclined, a tangential force is generated when the airflow impacts it, driving the pneumatic rotating ring 7 to rotate around its axis.

[0037] The outer surface of the pneumatic rotating ring 7 is provided with a transmission corrugated groove 72. The transmission corrugated groove 72 is a circumferential groove that undulates in a wave shape along the axial direction of the pneumatic rotating ring 7. That is, the groove extends continuously in the circumferential direction of the pneumatic rotating ring 7, and at the same time undulates in a sine wave or similar waveform along the axial direction.

[0038] When the pneumatic rotating ring 7 rotates, the second telescopic locking pin 421, housed in the transmission corrugated groove 72, moves along the wavy trajectory of the corrugated groove. As the corrugated groove undulates axially, the second telescopic locking pin 421 generates a reciprocating displacement along the axial direction of the pneumatic rotating ring 7 while rotating with it, thereby driving the second connecting rod 42 to reciprocate along its axial direction.

[0039] The reciprocating extension and retraction of the second link 42 drives the first link 41 to move via the hinge shaft 43. Because the first telescopic latch 411 on the first link 41 is constrained by the guide groove 21, the first link 41 oscillates periodically with the first telescopic latch 411 as the fulcrum (i.e., the contact point between the guide groove 21 and the first telescopic latch 411). The hammer 3 at the end of the first link 41 then periodically strikes the surface of the detection section 11, breaking up the coking layer.

[0040] The probe 1 is also equipped with an exhaust pipe 531. One end of the exhaust pipe 531 is connected to the cleaning air passage 53, and the other end is connected to the exhaust hole 532 between the adjacent receiving chambers 2.

[0041] A guide nozzle is provided on the exhaust port 532. The guide nozzle guides the airflow obliquely to the surface of the detection section 11, which is used to blow away the rubber shell debris that has been shaken off from the surface of the detection section 11, and prevent the debris from accumulating and affecting the flame detection signal.

[0042] The working process of the descaling device of the present invention is as follows: S1: Propulsion and Attitude Switching Stage. The air supply mechanism supplies air to the pneumatic chamber 5 through the first air supply pipe 51, and the compressed air pushes the pneumatic slider 6 to move in the first direction. The pneumatic slider 6 pushes the second connecting rod 42 through the connecting rod, so that the linkage mechanism 4 switches from the storage posture to the working posture. During this process, the first telescopic latch 411 on the first connecting rod 41 slides along the guide groove 21, and the guide groove 21 guides the first connecting rod 41 to rotate around the hinge axis 43, so that the hammer 3 tilts towards the surface of the detection part 11.

[0043] S2: Vibration Drive Stage. When the pneumatic slider 6 moves to its working position, the connecting air passage 61 connects with the cleaning air passage 53. The airflow flows out through the cleaning air passage 53 and impacts the transmission blade 71, driving the pneumatic rotating ring 7 to rotate. The pneumatic rotating ring 7, through the cooperation of the transmission corrugated groove 72 and the second telescopic latch 421, drives the second connecting rod 42 to reciprocate along its axial direction, and then drives the first connecting rod 41 to periodically swing around the first telescopic latch 411 as the fulcrum through the hinge shaft 43, so that the hammer 3 periodically hammers the surface of the detection part 11, breaking the coking layer.

[0044] S3: Purging and cleaning stage. The airflow enters the exhaust pipe 531 through the cleaning air passage 53 and is sprayed out from the guide nozzle of the exhaust port 532, blowing away the rubber shell debris that has been shaken off from the surface of the detection section 11.

[0045] S4: Reset Phase. The air supply mechanism switches to the second air supply line 52, and compressed air pushes the pneumatic slider 6 to move in the second direction to reset. The pneumatic slider 6 pulls the second connecting rod 42 through the connecting rod, and the connecting rod mechanism 4 switches to the storage posture, and the hammer 3 retracts into the storage cavity 2. At the same time, the connecting air passage 61 is disconnected from the cleaning air passage 53, and the rapping and blowing actions stop.

[0046] In a preferred embodiment, the number and arrangement of the receiving cavities 2 differ. In this embodiment, there are eight sets of receiving cavities 2, evenly distributed in a ring around the detection section 11 of the probe 1. The eight sets of receiving cavities 2 correspond to eight sets of hammers 3 and linkage mechanisms 4, which can provide more uniform vibration coverage in the circumferential direction of the detection section 11, and are suitable for fire detection probes with larger diameters or more severe coking.

[0047] It is easy to imagine that the gas supply mechanism also includes electromagnetic control valves installed on the first gas supply line 51 and the second gas supply line 52. The electromagnetic control valves are connected to the boiler control system and can automatically start the decoking program according to the preset decoking cycle (such as starting once every 4 hours) or when the flame detector signal strength drops to a preset threshold, so as to realize fully automatic online decoking.

[0048] It should be noted that if the embodiments of the present invention involve directional indicators (such as up, down, left, right, front, back, etc.), the directional indicators are only used to explain the relative positional relationship and movement of the components in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicators will also change accordingly.

[0049] Furthermore, if the embodiments of this invention involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. If the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this invention.

[0050] Additionally, "multiple" refers to two or more.

[0051] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A pneumatic descaling device for a flame detector probe, disposed inside the probe (1), characterized in that, include: The receiving cavity (2) is arranged in multiple groups and evenly distributed in a ring around the detection part (11) of the probe (1). The receiving cavity (2) is equipped with a hammer (3) and a linkage mechanism (4). The pneumatic cavity (5) is arranged in a one-to-one correspondence with each of the storage cavities (2) and adjacent to each other. A pneumatic slider (6) is provided in the pneumatic cavity (5). The pneumatic slider (6) is fixedly connected to the linkage mechanism (4) through a connecting rod that passes through the wall between the pneumatic cavity (5) and the storage cavity (2). An air supply mechanism is used to supply air into the pneumatic cavity (5) to drive the pneumatic slider (6) to reciprocate. The pneumatic slider (6) drives the linkage mechanism (4) to switch between working posture and storage posture through the connecting rod. The linkage mechanism (4) has a storage posture that is stored in the storage cavity (2) and a working posture that extends outward to align the hammer (3) with the surface of the detection part (11). The pneumatic slider (6) has a connecting air passage (61), and the receiving cavity (2) has a cleaning air passage (53). When the pneumatic slider (6) moves to its working position, the connecting air passage (61) and the cleaning air passage (53) are connected. A pneumatic rotating ring (7) is rotatably disposed inside the probe (1) and located inside the receiving cavity (2). The inner wall of the pneumatic rotating ring (7) is provided with a transmission blade (71) corresponding to the outlet end of the cleaning air passage (53). The outer surface of the pneumatic rotating ring (7) is provided with a transmission corrugated groove (72). When the air supply mechanism supplies air to the pneumatic cavity (5) and the connecting air passage (61) is connected to the cleaning air passage (53), the airflow flows out through the cleaning air passage (53) and impacts the transmission blade (71), driving the pneumatic rotating ring (7) to rotate. The transmission corrugated groove (72) drives the linkage mechanism (4) in the working posture to move, so that the hammer (3) vibrates and removes coke from the surface of the detection part (11).

2. The pneumatic decoking device for a flame detector probe according to claim 1, characterized in that: The linkage mechanism (4) includes a first link (41), a second link (42), and a hinge shaft (43) connecting the two. The first connecting rod (41) is provided with a first telescopic latch (411), and the end of the first connecting rod (41) is fixedly connected to the hammer (3); The bottom of the second link (42) is provided with a second telescopic pin (421). The second link (42) is a sleeve structure that can be extended and retracted along its axial direction. When the link mechanism (4) is in the working posture, the second telescopic pin (421) cooperates with the transmission corrugated groove (72).

3. The pneumatic decoking device for a flame detector probe according to claim 2, characterized in that: The storage cavity (2) is provided with a guide groove (21). The guide groove (21) is used to cooperate with the first telescopic pin (411) during the outward extension of the linkage mechanism (4) to guide the first linkage (41) to rotate around the hinge axis (43) so that the hammer (3) tilts toward the surface of the detection part (11).

4. The pneumatic decoking device for a flame detector probe according to claim 2, characterized in that: The probe (1) has a rotating cavity corresponding to the pneumatic rotating ring (7). The rotating cavity is located inside the receiving cavity (2). Bearing balls are provided between the pneumatic rotating ring (7) and the inner wall of the rotating cavity. The transmission blade (71) is inclinedly disposed on the outlet path of the cleaning air passage (53), and the transmission corrugated groove (72) is a circumferential groove with a wave-like undulation along the axial direction of the pneumatic rotating ring (7). When the pneumatic rotating ring (7) rotates, the transmission corrugated groove (72) drives the second connecting rod (42) to reciprocate along its axial direction through the second telescopic pin (421) housed therein, and drives the first connecting rod (41) to swing periodically with the first telescopic pin (411) as the fulcrum through the hinge shaft (43), so that the hammer (3) hammers the surface of the detection part (11).

5. The pneumatic decoking device for a flame detector probe according to claim 1, characterized in that: The air supply mechanism includes a first air supply line (51) and a second air supply line (52) respectively connected to the two ends of the pneumatic cavity (5), and the pneumatic cavity (5) and the pneumatic slider (6) are dynamically sealed together. When the first air supply line (51) supplies air, it pushes the pneumatic slider (6) to move in the first direction to its working position, so that the linkage mechanism (4) switches to the working posture, and at the same time the connecting air passage (61) is connected to the cleaning air passage (53); When the second air supply line (52) supplies air, it pushes the pneumatic slider (6) to move in the second direction to its storage position, so that the linkage mechanism (4) switches to the storage posture, and the connecting air passage (61) is disconnected from the cleaning air passage (53).

6. The pneumatic decoking device for a flame detector probe according to claim 1, characterized in that: The probe (1) is also provided with an exhaust pipe (531), one end of which is connected to the cleaning air passage (53), and the other end is connected to the exhaust hole (532) between adjacent storage chambers (2). The exhaust port (532) is provided with a guide nozzle, which is used to guide the airflow obliquely to the surface of the detection part (11) to blow away the rubber shell debris that has been shaken off.

7. A method for removing char from a flame detector probe, characterized in that, Using the pneumatic decoking device for a fire detector probe as described in any one of claims 1-6 includes the following steps: S1: The air supply mechanism supplies air to the pneumatic cavity (5), drives the pneumatic slider (6) to move in the first direction, and pushes the linkage mechanism (4) from the storage posture to the working posture through the connecting rod, so that the hammer (3) is aligned with the surface of the detection part (11). S2: When the pneumatic slider (6) moves to the working position, the connecting air passage (61) is connected to the cleaning air passage (53), and the airflow flows out through the cleaning air passage (53) and impacts the transmission blade (71), driving the pneumatic rotating ring (7) to rotate; S3: The pneumatic rotating ring (7) drives the linkage mechanism (4) through the transmission corrugated groove (72) on its outer surface, so that the hammer (3) periodically vibrates the surface of the detection part (11) to break the plastic shell. S4: The airflow enters the exhaust pipe (531) through the cleaning air passage (53) and is sprayed out from the guide nozzle of the exhaust hole (532), blowing away the rubber shell debris that has been shaken off from the surface of the detection part (11); S5: The gas supply mechanism stops supplying gas or switches to the second gas supply line (52) to supply gas. The pneumatic slider (6) moves to the second direction to reset. The linkage mechanism (4) switches to the storage posture. The connecting air passage (61) and the cleaning air passage (53) are disconnected.

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