Flame detection device

Abstract

The present invention discloses a flame detection device, comprising a housing, a scraper, a detection probe, and a drive mechanism. The housing forms a cavity, one side of the cavity being open. The scraper and the detection probe are retractably disposed within the housing, and the drive mechanism is configured to drive the scraper and the detection probe to sequentially extend out of the opening, or to drive the scraper and the detection probe to sequentially retract through the opening into the housing. During the detection process, the flame detection device of the present invention does not require the entire flame detection device to be placed within a fireplace; instead, the opening of the flame detection device only needs to face the fireplace opening, making it flexible and convenient to use. Furthermore, before the detection probe detects the flame within the fireplace, the scraper is used to scrape and clean the fireplace wall. This prevents the detection probe from being contaminated by dust from the fireplace wall during the detection process, thereby improving the accuracy of the detection results.

Description

Technical Field

[0001] The present invention relates to the technical field of boiler monitoring and management, and in particular to a flame detection device. Background Art

[0002] Currently, flame detectors are required to detect flames in fireplaces. However, existing flame detectors require the entire flame detector to be placed inside the fireplace when detecting flames in the fireplace, which is inconvenient to use. In addition, the detection probe of the flame detector may come into contact with dust on the furnace wall when it is inserted into the fireplace, affecting the detection results and making the detection results less accurate. Summary of the Invention

[0003] The main purpose of the present invention is to provide a flame detection device, which aims to solve the problems of inconvenience in use and poor detection accuracy of existing flame detectors.

[0004] To achieve the above-mentioned purpose, the present invention proposes a flame detection device, which includes a shell, a scraper, a detection probe and a driving mechanism. A cavity is formed in the shell, and one side of the cavity is open. The scraper and the detection probe can be telescopically arranged in the shell, and the driving mechanism is used to drive the scraper and the detection probe to extend out of the opening in sequence, or drive the scraper and the detection probe to retract into the shell through the opening in sequence.

[0005] Preferably, the driving mechanism is arranged in the shell, and the driving mechanism includes a driving member, a push-pull rod and a movable block. The movable block is connected to the end of the push-pull rod facing the opening, and the end of the push-pull rod facing away from the opening is connected to the driving member. The scraper plate is arranged close to the opening and is connected to the movable block through a connecting rod. The driving member is used to drive the push-pull rod to move relative to the shell toward or away from the opening.

[0006] Preferably, the driving mechanism further includes a mounting plate, a guide rod, a telescopic rod and a toggle block, the mounting plate being located on the side of the movable block facing away from the opening, the guide rod and the telescopic rod being arranged side by side and at intervals, one end of the guide rod being connected to the mounting plate, the other end of the guide rod being close to the opening, one end of the telescopic rod being connected to the mounting plate, the other end of the telescopic rod being close to the opening and equipped with the detection probe; the movable block being slidably mounted outside the guide rod, the toggle block being mounted on the telescopic rod, and the toggle block being located on the side of the movable block facing the opening and being used to abut against the movable block.

[0007] Preferably, the toggle block is rotatably mounted on the telescopic rod, and the toggle block can rotate relative to the telescopic rod between an initial position and an extreme position; a limit rod is installed on the shell, the limit rod is located between the toggle block and the mounting plate, and the limit rod is connected to the toggle block by an elastic member; the movable block is used to abut against the toggle block in the initial position, and drive the toggle block to rotate relative to the telescopic rod to the extreme position, so that the telescopic rod is driven by the toggle block to move toward the direction close to the opening.

[0008] Preferably, the toggle block is rotatably mounted on the telescopic rod via a rotating shaft, and a spiral spring is provided on the outer sleeve of the rotating shaft, one end of the spiral spring is connected to the toggle block, and the other end of the spiral spring is connected to the telescopic rod.

[0009] Preferably, a limiting hole is provided on the shell wall of the shell, and the limiting rod is inserted into the limiting hole and engaged with the limiting hole.

[0010] Preferably, a guide plate is installed on the guide rod, a guide groove is opened on the inner wall of the shell, the extension direction of the guide groove is consistent with the extension direction of the telescopic rod, and the guide plate extends into the guide groove and is in sliding contact with the guide groove.

[0011] Preferably, the flame detection device also includes a cooling mechanism, which is arranged in the shell and close to the opening; the cooling mechanism includes a cooling shell and a heat dissipation fan, the cooling shell is formed with a avoidance port and a accommodating cavity, the heat dissipation fan is accommodated in the accommodating cavity, and the cavity wall of the accommodating cavity is provided with a plurality of heat dissipation holes connected to the avoidance port, the avoidance port is used for the scraper plate to pass through, and the detection probe is telescopically arranged at the avoidance port.

[0012] Preferably, the cooling mechanism further includes a heat dissipation pipe and a plurality of heat dissipation fins. The heat dissipation pipe is arranged in the shell wall of the cooling shell and is connected to the accommodating cavity. The plurality of heat dissipation fins are installed on the heat dissipation pipe at intervals and extend into the avoidance opening.

[0013] Preferably, the cooling mechanism further comprises a plurality of air guide tubes, which are installed at intervals on a side of the heat dissipation tube away from the avoidance port, and each of the air guide tubes passes through the shell wall of the cooling shell and is connected to the heat dissipation tube.

[0014] In the technical solution of the present invention, the flame detection device does not need to be placed entirely within the fireplace during detection. Instead, the flame detection device only needs to be positioned so that its opening faces the fireplace opening. A drive mechanism can be used to extend or retract the detection probe into its housing to detect the flame within the fireplace, providing flexibility and convenience. Furthermore, before the detection probe detects the flame within the fireplace, a dust scraper is used to scrape and clean the fireplace wall. This prevents the detection probe from being contaminated by dust from the fireplace wall during detection, thereby improving the accuracy of the detection results. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying any creative work.

[0016] Figure 1 This is a front view schematic diagram of a flame detection device according to an embodiment of the present invention, in which the scraper plate and the detection probe are retracted into the housing;

[0017] Figure 2 This is a schematic front view of a flame detection device according to an embodiment of the present invention, in which a scraper plate and a detection probe extend out of an opening;

[0018] Figure 3 The figure is a schematic structural diagram of a cooling mechanism in a flame detection device according to an embodiment of the present invention.

[0019] Description of Figure Numbers:

[0020]

[0021] The purpose, features and advantages of the present invention will be further described with reference to the accompanying drawings and in conjunction with the embodiments. DETAILED DESCRIPTION

[0022] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0023] It should be noted that if the embodiments of the present invention involve directional indications (such as up, down, left, right, front, back, etc.), such directional indications are only used to explain the relative position relationship, movement status, etc. between the various components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0024] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the present invention, the descriptions of "first", "second", etc. are only for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features specified as "first" and "second" may explicitly or implicitly include at least one of such features. In addition, the technical solutions between the various embodiments can be combined with each other, but this must be based on the fact that ordinary technicians in this field can implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0025] In the present invention, the descriptions of directions such as "up", "down", "front", "back", "left", and "right" are as follows: Figures 1 to 3 The directions shown are for reference only and are used to explain the Figures 1 to 3 The relative positional relationship between the components in the shown posture. If the specific posture changes, the directional indication will also change accordingly.

[0026] The present invention provides a flame detection device.

[0027] like Figure 1 and Figure 2 As shown, the flame detection device 100 of this embodiment includes a shell 10, a scraper plate 20, a detection probe 30 and a driving mechanism 40. A cavity 11 is formed in the shell 10, and one side of the cavity 11 is provided with an opening 12. The scraper plate 20 and the detection probe 30 are retractably arranged in the shell 10. The driving mechanism 40 is used to drive the scraper plate 20 and the detection probe 30 to extend out of the opening 12 in sequence, or to drive the scraper plate 20 and the detection probe 30 to retract into the shell 10 through the opening 12 in sequence.

[0028] Specifically, in order to ensure the explosion-proof performance of the flame detection device 100, the housing 10 of this embodiment is made of explosion-proof materials in the prior art. The left side of the housing 10 is provided with an opening 12 to facilitate the entry and exit of the dust scraper 20 and the detection probe 30. The flame detection device 100 of this embodiment can detect the flame in the fireplace. When in use, the flame detection device 100 is placed outside the fireplace, and it is only necessary to make the opening 12 of the flame detection device 100 face the opening of the fireplace. Figure 2As shown, during the detection process, the drive mechanism 40 of the flame detection device 100 drives the scraper 20 to first extend out of the opening 12 of the housing 10. It can be understood that after extending out of the opening 12, the scraper 20 will enter the fireplace through the opening on the fireplace, contact the fireplace wall, and scrape the dust on the fireplace wall, thereby completing the dust cleaning work on the fireplace wall in advance. Next, the drive mechanism 40 drives the detection probe 30 to extend out of the opening 12 of the housing 10, so that the detection probe 30 can enter the fireplace and detect the flame in the fireplace. Figure 1 As shown, after the detection work is completed, the driving mechanism 40 first drives the scraper 20 to retract into the shell 10 through the opening 12, and then drives the detection probe 30 to retract into the shell 10 through the opening 12 to achieve storage.

[0029] During the detection process, the flame detection device 100 of this embodiment does not need to be placed entirely within the fireplace. Instead, the opening 12 of the flame detection device 100 is simply aligned with the fireplace opening. Fireplace flame detection is accomplished by extending or retracting the detection probe 30 through the housing 10 via the drive mechanism 40, providing flexibility and convenience. Furthermore, before the detection probe 30 detects the flame within the fireplace, the scraper 20 first scrapes and cleans the fireplace wall. This prevents the detection probe 30 from being contaminated by dust from the fireplace wall during detection, thereby improving the accuracy of the detection results.

[0030] The driving mechanism 40 of this embodiment is arranged in the shell 10, and the driving mechanism 40 includes a driving member, a push-pull rod 42 and a movable block 43. The movable block 43 is connected to the end of the push-pull rod 42 facing the opening 12, and the end of the push-pull rod 42 facing away from the opening 12 is connected to the driving member. The scraper plate 20 is arranged close to the opening 12 and is connected to the movable block 43 through a connecting rod. The driving member is used to drive the push-pull rod 42 to move relative to the shell 10 toward or away from the opening 12.

[0031] The driving member of this embodiment can be an electric push rod 41 in the prior art. It is understandable that the flame detection device 100 includes a signal processor 50 to receive the flame intensity signal within the fireplace detected by the detection probe 30 and process the flame intensity signal into readable signal intensity data. The signal processor 50 can be based on prior art. For ease of installation, the housing 10 includes two parts, namely a first sub-housing 13 and a second sub-housing 14. The first sub-housing 13 is located to the left of the second sub-housing 14. The driving mechanism 40, except for the electric push rod 41, is placed in the first sub-housing 13. The electric push rod 41 and the signal processor 50 are placed in the second sub-housing 14. The electric push rod 41 extends through the housing wall between the first sub-housing 13 and the second sub-housing 14 and is connected to the push-pull rod 42.

[0032] The left end of the push-pull rod 42 is connected to the movable block 43, and the right end of the push-pull rod 42 is connected to the electric push rod 41. The scraper 20 is positioned near the opening 12, and the right side of the scraper 20 is connected to the movable block 43 via a connecting rod. During the inspection process, the electric push rod 41 is activated and drives the push-pull rod 42 to move toward the opening 12, that is, drives the push-pull rod 42 to move to the left, and then drives the movable block 43 and the scraper 20 to move to the left through the push-pull rod 42, so that the scraper 20 extends out of the opening 12 and enters the fireplace to scrape and clean the furnace wall. After the inspection is completed, the electric push rod 41 drives the push-pull rod 42 to move away from the opening 12, that is, drives the push-pull rod 42 to move to the right, and then drives the movable block 43 and the scraper 20 to move to the right through the push-pull rod 42, so that the scraper 20 retracts through the opening 12 into the housing 10 for storage.

[0033] Furthermore, the driving mechanism 40 also includes a mounting plate 45, a guide rod 46, a telescopic rod 47 and a toggle block 48. The mounting plate 45 is located on the side of the movable block 43 facing away from the opening 12. The guide rod 46 and the telescopic rod 47 are arranged side by side and at intervals. One end of the guide rod 46 is connected to the mounting plate 45, and the other end of the guide rod 46 is close to the opening 12. One end of the telescopic rod 47 is connected to the mounting plate 45, and the other end of the telescopic rod 47 is close to the opening 12 and is equipped with a detection probe 30; the movable block 43 can be slidably mounted on the outside of the guide rod 46, the toggle block 48 is installed on the telescopic rod 47, and the toggle block 48 is located on the side of the movable block 43 facing the opening 12 and is used to abut against the movable block 43.

[0034] like Figure 1 and Figure 2As shown, the guide rod 46 and the telescopic rod 47 both extend left and right, meaning their lengths are oriented left and right. A mounting plate 45 is located to the right of the movable block 43. The guide rod 46 and the telescopic rod 47 are arranged side by side and spaced apart. The right end of the guide rod 46 is connected to the mounting plate 45, with the left end of the guide rod 46 proximate to the opening 12. The right end of the telescopic rod 47 is connected to the mounting plate 45, with the left end of the telescopic rod 47 proximate to the opening 12. The detection probe 30 is mounted on the left end of the telescopic rod 47. The movable block 43 is slidably mounted on the outside of the guide rod 46. A toggle block 48 is mounted on the telescopic rod 47 and is located to the left of the movable block 43. During the detection process, driven by the electric push rod 41, the movable block 43 slides leftward along the guide rod 46, thereby driving the scraper plate 20 to move leftward and extend out of the opening 12. The guide rod 46 acts as a guide and limiter, facilitating the stable movement of the movable block 43 and the scraper plate 20. When movable block 43 slides leftward to toggle block 48, it abuts against toggle block 48, thereby moving toggle block 48 leftward. Toggle block 48, in turn, moves telescopic rod 47 leftward, allowing detection probe 30, mounted on the left end of telescopic rod 47, to extend out of opening 12 and into the fireplace to complete the inspection. The arrangement of drive mechanism 40 in this embodiment enables the scraper 20 and detection probe 30 to sequentially extend out of opening 12, resulting in an ingenious and flexible structural design.

[0035] Furthermore, the toggle block 48 is rotatably mounted on the telescopic rod 47, and the toggle block 48 can rotate between an initial position and an extreme position relative to the telescopic rod 47; a limit rod 15 is installed on the housing 10, the limit rod 15 is located between the toggle block 48 and the mounting plate 45, and the limit rod 15 and the toggle block 48 are connected by an elastic member 49; the movable block 43 is used to abut against the toggle block 48 in the initial position, and drive the toggle block 48 to rotate relative to the telescopic rod 47 to the extreme position, and drive the telescopic rod 47 to move toward the direction close to the opening 12 through the toggle block 48.

[0036] The toggle block 48 is hinged to the telescopic rod 47. When the toggle block 48 is in the initial position, the toggle block 48 is tilted to the right, and there is a certain angle between the toggle block 48 and the horizontal line. For example, the angle between the toggle block 48 and the horizontal line is 5°. When the movable block 43 slides to the position of the toggle block 48, the toggle block 48 abuts against the movable block 43 and rotates from the initial position to the limit position under the drive of the movable block 43 until it reaches the limit position. At this time, the toggle block 48 is tilted to the left, and the angle between the toggle block 48 and the horizontal line can be 145°. After the toggle block 48 reaches the limit position, it no longer rotates, but moves to the left with the movable block 43, thereby driving the telescopic rod 47 and the detection probe 30 to move to the left through the toggle block 48. At this time, the elastic member 49 is in a stretched state. Figure 2In one embodiment, the rotation angle of the toggle block 48 may be 90° to 145°, that is, the angle between the toggle block 48 rotating from the initial position to the extreme position may be 90° to 145°.

[0037] In this embodiment, as the movable block 43 moves leftward, the rotation of the toggle block 48 drives the telescopic rod 47 to rotate. However, it takes a certain amount of time for the toggle block 48 to rotate from its initial position to its limit position. Before the toggle block 48 reaches its limit position, the dust scraper 20 has already extended from the opening 12 to perform its dust scraping and cleaning operation. This causes the telescopic rod 47 to lag behind the dust scraper 20 in its movement, and thus, the dust cleaning operation is completed before the detection probe 30 extends from the opening 12, ensuring the accuracy of the detection results. After the detection is completed, the electric push rod 41 drives the push-pull rod 42 and the movable block 43 to move rightward, thereby driving the dust scraper 20 to retract through the opening 12 into the housing 10. As the movable block 43 moves rightward, it gradually disengages from the toggle block 48. The toggle block 48 then moves rightward under the restoring force of the elastic member 49, which in turn drives the telescopic rod 47 to move rightward and reset, thereby driving the detection probe 30 to retract through the opening 12 into the housing 10, returning to its original position. The elastic member 49 of this embodiment can be a tension spring in the prior art.

[0038] In this embodiment, the toggle block 48 is rotatably mounted on the telescopic rod 47 via a rotating shaft 481. A spiral spring is disposed on the outer surface of the rotating shaft 481. One end of the spiral spring is connected to the toggle block 48, and the other end of the spiral spring is connected to the telescopic rod 47. Due to the provision of the spiral spring, after the movable block 43 and the toggle block 48 are disengaged from each other, the toggle block 48 can return to its initial position under the elastic action of the spiral spring, facilitating the automatic reset of the toggle block 48, which is simple and convenient.

[0039] In this embodiment, the housing 10 has a limit hole formed in its wall, into which a limit rod 15 is inserted and engaged. The limit rod 15 engages with the limit hole in the housing 10, facilitating assembly and facilitating the repositioning of the telescopic rod 47 and the detection probe 30 in cooperation with the elastic member 49.

[0040] In this embodiment, a guide plate 461 is mounted on the guide rod 46. A guide groove is defined on the inner wall of the housing 10. The guide groove extends in the same direction as the extension of the telescopic rod 47. The guide plate 461 extends into the guide groove and engages in sliding contact with the guide groove. The telescopic rod 47 and the guide groove both extend in the left-right direction. During the left-right movement of the guide rod 46 and the telescopic rod 47, the guide plate 461 always engages in sliding contact with the guide groove on the inner wall of the housing 10. The guide groove serves as a guide, facilitating the stable movement of the guide rod 46 and the telescopic rod 47. To further enhance the movement stability of the scraper plate 20, the scraper plate 20 can be slidably mounted on the guide rod 46, so that the scraper plate 20 engages in sliding contact with the guide rod 46 during left-right movement.

[0041] like Figure 1 and Figure 2 As shown, in this embodiment, there are two guide rods 46, which are arranged at intervals up and down, and the telescopic rod 47 is located between the two guide rods 46. Each guide rod 46 is provided with a guide plate 461, and the upper and lower inner walls of the shell 10 are provided with guide grooves. Each guide plate 461 is in sliding contact with a corresponding guide groove, further improving the movement stability of the guide rod 46 and the telescopic rod 47.

[0042] like Figures 1 to 3 As shown, the flame detection device 100 of this embodiment also includes a cooling mechanism 60, which is arranged in the shell 10 and close to the opening 12; the cooling mechanism 60 includes a cooling shell 61 and a heat dissipation fan 62, the cooling shell 61 is formed with a avoidance opening 611 and a accommodating cavity 612, the heat dissipation fan 62 is accommodated in the accommodating cavity 612, and the cavity wall of the accommodating cavity 612 is provided with a plurality of heat dissipation holes connected to the avoidance opening 611, the avoidance opening 611 is used for the scraper plate 20 to pass through, and the detection probe 30 is telescopically arranged at the avoidance opening 611.

[0043] Specifically, the cooling mechanism 60 is located near the left side of the shell 10, that is, the cooling mechanism 60 is arranged near the opening 12, and a avoidance opening 611 is formed in the middle position of the cooling shell 61. The scraper 20 and the detection probe 30 can extend out of the opening 12 or retract into the shell 10 through the avoidance opening 611. A accommodating cavity 612 is formed on one side of the cooling shell 61, and a heat dissipation fan 62 is provided in the accommodating cavity 612. After the detection is completed, after the detection probe 30 is retracted into the shell 10, the detection probe 30 is located at the avoidance opening 611. At this time, the heat dissipation fan 62 is started, and the heat dissipation fan 62 can blow cold air in the direction of the avoidance opening 611 through a plurality of heat dissipation holes to quickly dissipate heat from the detection probe 30, thereby cooling the detection probe 30 and improving the service life of the detection probe 30.

[0044] Furthermore, the cooling mechanism 60 includes a heat pipe 65 and a plurality of heat sinks 63. The heat pipe 65 is disposed within the wall of the cooling shell 61 and communicates with the accommodating cavity 612. The plurality of heat sinks 63 are installed at intervals on the heat pipe 65 and extend into the escape opening 611. When the cooling fan 62 is activated, cold air can be blown into the heat pipe 65, exchanging heat with the plurality of heat sinks 63. Furthermore, the heat sinks 63 exchange heat with the air in the escape opening 611, thereby cooling the detection probe 30 when it is retracted into the escape opening 611, further improving the cooling effect on the detection probe 30.

[0045] Furthermore, the cooling mechanism 60 also includes a plurality of air ducts 64, which are installed at intervals on the side of the heat dissipation pipe 65 facing away from the avoidance opening 611. Each air duct 64 penetrates the wall of the cooling shell 61 and communicates with the heat dissipation pipe 65. Specifically, the plurality of heat dissipation pipes 65 are installed at intervals on the side of the heat dissipation pipe 65 facing the inner wall of the housing 10. One end of the heat dissipation pipe 65 is connected to the heat dissipation pipe 65, and the other end of the heat dissipation pipe 65 penetrates the wall of the cooling shell 61. The cold air in the heat dissipation pipe 65 can also be blown toward the inner wall of the housing 10 through the plurality of air ducts 64, thereby dissipating heat and cooling the housing 10 and improving the service life of the entire flame detection device 100.

[0046] The above are only preferred embodiments of the present invention and are not intended to limit the patent scope of the present invention. All equivalent structural transformations made using the contents of the present invention's description and drawings, or direct / indirect applications in other related technical fields, within the scope of the present invention are included in the patent protection scope of the present invention.

Claims

1. A flame detection device, characterized in that: The flame detection device includes a housing, a scraper, a detection probe, and a drive mechanism. A cavity is formed in the housing, one side of the cavity is open, the scraper and the detection probe are retractably disposed in the housing, and the drive mechanism is used to drive the scraper and the detection probe to extend out of the opening in sequence, or to drive the scraper and the detection probe to retract into the housing through the opening in sequence. The driving mechanism is arranged in the housing, and includes a driving member, a push-pull rod and a movable block. The movable block is connected to one end of the push-pull rod facing the opening, and the other end of the push-pull rod facing away from the opening is connected to the driving member. The scraper is arranged near the opening and is connected to the movable block through a connecting rod. The driving member is used to drive the push-pull rod to move relative to the housing toward or away from the opening. The driving mechanism further includes a mounting plate, a guide rod, a telescopic rod and a toggle block, the mounting plate being located on a side of the movable block facing away from the opening, the guide rod and the telescopic rod being arranged side by side and spaced apart, one end of the guide rod being connected to the mounting plate, the other end of the guide rod being close to the opening, one end of the telescopic rod being connected to the mounting plate, the other end of the telescopic rod being close to the opening and equipped with the detection probe; the movable block being slidably sleeved outside the guide rod, the toggle block being mounted on the telescopic rod, and the toggle block being located on a side of the movable block facing the opening and being used to abut against the movable block; The toggle block is rotatably mounted on the telescopic rod, and the toggle block can rotate relative to the telescopic rod between an initial position and an extreme position; a limit rod is mounted on the housing, the limit rod is located between the toggle block and the mounting plate, and the limit rod and the toggle block are connected by an elastic member; the movable block is used to abut against the toggle block in the initial position, and drive the toggle block to rotate relative to the telescopic rod to the extreme position, thereby driving the telescopic rod to move toward the opening through the toggle block; The toggle block is rotatably mounted on the telescopic rod via a rotating shaft, and a spiral spring is provided on the outer sleeve of the rotating shaft, one end of the spiral spring is connected to the toggle block, and the other end of the spiral spring is connected to the telescopic rod; A guide plate is mounted on the guide rod, a guide groove is provided on the inner wall of the housing, the extension direction of the guide groove is consistent with the extension direction of the telescopic rod, and the guide plate extends into the guide groove and is in sliding contact with the guide groove.

2. The flame detection device according to claim 1, wherein A limiting hole is provided on the shell wall of the shell, and the limiting rod is inserted into the limiting hole and engaged with the limiting hole.

3. The flame detection device according to any one of claims 1 to 2, characterized in that: The flame detection device also includes a cooling mechanism, which is arranged in the shell and close to the opening; the cooling mechanism includes a cooling shell and a heat dissipation fan, the cooling shell is formed with a avoidance port and a accommodating cavity, the heat dissipation fan is accommodated in the accommodating cavity, and the cavity wall of the accommodating cavity is provided with a plurality of heat dissipation holes connected to the avoidance port, the avoidance port is used for the scraper plate to pass through, and the detection probe is telescopically arranged at the avoidance port.

4. The flame detection device according to claim 3, characterized in that The cooling mechanism further includes a heat dissipation pipe and a plurality of heat dissipation fins. The heat dissipation pipe is arranged in the shell wall of the cooling shell and is communicated with the accommodating cavity. The plurality of heat dissipation fins are installed on the heat dissipation pipe at intervals and extend into the avoidance opening.

5. The flame detection device according to claim 4, characterized in that: The cooling mechanism further includes a plurality of air guide tubes, which are installed at intervals on a side of the heat dissipation tube away from the avoidance port, and each of the air guide tubes penetrates the shell wall of the cooling shell and is in communication with the heat dissipation tube.

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