A thermocouple for measuring flue gas

Abstract

The present invention discloses a thermocouple for measuring flue gas, which relates to the field of thermocouples and solves the problem that the surface of the existing thermocouple for measuring flue gas is prone to accumulate soot during use, affecting the detection accuracy of the thermocouple. It includes a junction box, a thermocouple tube, a cleaning device and a driving device. The junction box is fixedly connected to the thermocouple tube. For this thermocouple for measuring flue gas, by setting the cleaning device and the driving device, it is convenient to drive the cleaning device to clean the surface of the thermocouple tube by using the power of the soot flow, sweeping the soot from one end of the junction box to the end of the thermocouple tube. At the same time, after removing the soot at the end of the thermocouple tube, it moves to one end of the junction box to re-perform the cleaning work without contacting the thermocouple tube. This device can effectively clean the dust on the surface of the thermocouple tube and complete the self-cleaning of the device, without the need for additional power and motors for driving, improving the accuracy of the thermocouple measurement, saving labor costs at the same time, and extending the service life of the thermocouple.

Description

Technical Field

[0001] The present invention relates to the technical field of thermocouples, and particularly to a thermocouple for measuring flue gas. Background Technique

[0002] A thermocouple is a commonly used temperature measuring element in temperature measuring instruments. It directly measures temperature and converts the temperature signal into a thermal electromotive force signal, which is then converted into the temperature of the measured medium by an electrical instrument (secondary instrument). The outer shapes of various thermocouples are often very different due to requirements, but their basic structures are roughly the same. They usually consist of main parts such as thermal electrodes, insulating sleeve protection tubes, and junction boxes, and are usually used in conjunction with display instruments, recording instruments, and electronic regulators.

[0003] For the existing thermocouple for measuring flue gas, which is installed inside the flue gas pipeline for a long time, there are many pollutants in the flue gas and it is easy to adhere to the surface of the thermocouple, making the outer wall of the thermocouple thicker, thus affecting the sensitivity and accuracy of the thermocouple for temperature measurement. It requires manual cleaning at regular intervals, but this cleaning method is time-consuming and laborious, and it is difficult to achieve real-time cleaning. The surface of the thermocouple will still accumulate soot during use, affecting the use accuracy. Therefore, we propose a thermocouple for measuring flue gas. Summary of the Invention

[0004] The purpose of the present invention is to provide a thermocouple for measuring flue gas that is convenient for cleaning the surface of the thermocouple tube and performing self-cleaning, so as to solve the problems raised in the above background technique.

[0005] To achieve the above purpose, the present invention provides the following technical solution: A thermocouple for measuring flue gas, including a junction box, a thermocouple tube, a cleaning device, and a driving device. The junction box is fixedly connected to the thermocouple tube. The cleaning device is installed on the thermocouple tube and is used to clean the surface of the thermocouple tube, scraping the soot remaining on the surface of the thermocouple tube from one end of the junction box to the other end and shaking it off. The driving device is installed on the junction box and is used to drive the cleaning device to continuously operate by using the power when the soot flows, facilitating the use of the power of the soot flow to drive the cleaning device to clean the surface of the thermocouple tube, sweeping the soot from one end of the junction box to the end of the thermocouple tube, and at the same time, after patting off the soot at the end of the thermocouple tube and without touching the thermocouple tube, moving to one end of the junction box to re-perform the cleaning work. This device is convenient for disassembly and assembly, can effectively clean the dust on the surface of the thermocouple tube and complete the self-cleaning of the device, without the need for additional power and motors for driving, improving the accuracy of the thermocouple measurement, saving labor costs at the same time, and extending the service life of the thermocouple.

[0006] Preferably, the cleaning device includes a device ring. A device groove is formed in the device ring. A plurality of sliding blocks are slidably connected in the device groove. One end of each sliding block is fixedly connected to a cleaning brush that is slidably connected to the surface of the thermocouple tube. An expansion member is provided in the device ring to push out the cleaning brush to clean the surface of the thermocouple tube when the device ring is away from the junction box, and retract the cleaning brush into the device groove when the device ring is close to the junction box. A flapping member is provided on the device ring to flap and shake off the dust on the surface of the cleaning brush when the device ring reaches the end of the thermocouple tube, facilitating the cleaning of the surface of the thermocouple tube, scraping the residual soot on the surface of the thermocouple tube from one end of the junction box to the other end and shaking it off.

[0007] Preferably, the driving device includes a protective shell fixedly installed on the junction box. A rotating ring is rotatably connected in the protective shell. A plurality of fan blades are fixedly connected to the outer wall of the rotating ring. One end of the rotating ring is coaxially fixedly connected to a toothed ring that is rotatably connected to the outer wall of the thermocouple tube. A plurality of guide rods are fixedly connected to the side surface of the toothed ring. All the plurality of guide rods penetrate through the device ring and are slidably connected to the device ring. A reciprocating member is provided on the protective shell to drive the device ring to reciprocate at both ends of the thermocouple tube, facilitating the use of the power of the flowing soot as the driving force to drive the rotation and reciprocating movement of the device ring.

[0008] Preferably, the reciprocating member includes a mounting bracket fixedly connected to the protective shell. A gear meshing with the toothed ring is rotatably connected to the mounting bracket. The gear is coaxially fixedly connected to a reciprocating lead screw. A guide block is threadedly connected to the reciprocating lead screw. An annular groove is formed in the side surface of the device ring. A limiting ring slidably connected to the annular groove is fixedly connected to the guide block, facilitating driving the device ring to reciprocate on the surface of the thermocouple tube during the rotation of the device ring without restriction.

[0009] Preferably, the expansion member includes a circular ring rotatably connected to the device groove. A sliding rod is fixedly connected to the side surface of each of the plurality of sliding blocks. A plurality of arc-shaped grooves respectively slidably connected to the plurality of sliding rods are formed in the side surface of the circular ring. A linkage device is provided in the device groove to drive the circular ring to rotate in different directions when the device ring moves to both ends of the thermocouple tube, so that the cleaning brush extends and retracts, facilitating the adjustment of the expansion and contraction state of the cleaning brush, so that the cleaning brush only sweeps the dust on the surface of the thermocouple tube towards the end of the thermocouple tube.

[0010] Preferably, the linkage device includes two rotating shafts rotatably connected to the device groove. A plurality of telescopic grooves are formed on the surface of the rotating shaft. A first spring is fixedly connected in each of the plurality of telescopic grooves. The first spring is fixedly connected to a trapezoidal block slidably connected to the telescopic groove. A first helical tooth groove meshing with the trapezoidal block is formed on the side surface of one end of any one of the guide rods close to the junction box, and a first groove is formed on the side surface of the end far from the junction box. A second groove is formed on the side surface of one end of the other guide rod close to the junction box, and a second helical tooth groove meshing with the other group of trapezoidal blocks is formed on the side surface of the end far from the junction box. A rotating member for driving the ring to rotate is provided on the rotating shaft, which is convenient for driving the cleaning brush to extend and retract when the device ring reaches both ends of the thermocouple tube and completing the limit.

[0011] Preferably, the rotating member includes a winding shaft fixedly installed on the side surfaces of the two groups of rotating shafts. A pulling rope is fixedly connected to the surface of the winding shaft. The other end of the pulling rope is fixedly connected to the side surface of the ring, which is convenient for driving the ring to rotate when the winding shaft rotates.

[0012] Preferably, the flapping member includes a first pulling spring fixedly installed on the side surface of the device ring. The first pulling spring is fixedly connected to a flapping ring slidably connected to the guide rod. A plurality of sliding grooves are formed in the flapping ring. A clamping block slidably connected to the guide rod is slidably connected in the sliding groove. A plurality of clamping grooves for clamping with the clamping block are formed on the side surface of the end of the guide rod far from the junction box. One end of the clamping block is fixedly connected to a second spring fixedly connected to the sliding groove, which is convenient for flapping the dust on the cleaning brush when the device ring reaches the end of the thermocouple tube to complete self-cleaning.

[0013] Preferably, a stop block for preventing the device ring and the guide block from slipping is fixedly connected to one end of each of the guide rod and the reciprocating lead screw, which is convenient for preventing the device ring and the guide block from slipping.

[0014] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0015] The present invention solves the problem that the surface of the existing thermocouple for measuring flue gas is prone to accumulate soot, which affects the detection accuracy of the thermocouple. By setting a cleaning device and a driving device, it is convenient to drive the cleaning device to clean the surface of the thermocouple tube by using the power of the soot flow, sweep the soot from one end of the junction box to the end of the thermocouple tube, and at the same time, after removing the soot at the end of the thermocouple tube, move to one end of the junction box to re-perform the cleaning work without contacting the thermocouple tube. The device is convenient for disassembly and installation, can effectively clean the dust on the surface of the thermocouple tube and complete the self-cleaning of the device, does not require additional power and motors for driving, improves the accuracy of the thermocouple measurement, saves labor costs, and prolongs the service life of the thermocouple. Brief Description of the Drawings

[0016] Figure 1 is a schematic diagram of the overall structure of the present invention;

[0017] Figure 2 is a schematic diagram of the structure of the present invention;

[0018] Figure 3 is a schematic diagram of the structure of the linkage device of the present invention;

[0019] Figure 4 is Figure 3 an enlarged view of area A in

[0020] Figure 5 is Figure 3 an enlarged view of area B in

[0021] Figure 6 is a schematic diagram of the structure of the driving device of the present invention;

[0022] Figure 7 is a schematic diagram of the internal structure of the device ring of the present invention;

[0023] Figure 8 is an exploded view of the structure of the cleaning device of the present invention;

[0024] Figure 9 is Figure 8 an enlarged view of area C in

[0025] Figure 10 is Figure 8 an enlarged view of area D in

[0026] Figure 11 is a sectional view of the structure of the cleaning device of the present invention;

[0027] Figure 12 is Figure 11 an enlarged view of area E in

[0028] In the figure: 1 - junction box; 2 - thermocouple tube; 3 - cleaning device; 4 - driving device; 5 - device ring; 6 - device groove; 7 - slider; 8 - cleaning brush; 9 - telescopic member; 10 - flapping member; 11 - protective shell; 12 - rotating ring; 13 - fan blade; 14 - toothed ring; 15 - guide rod; 16 - reciprocating member; 17 - mounting bracket; 18 - gear; 19 - reciprocating lead screw; 20 - guide block; 21 - annular groove; 22 - limiting ring; 23 - circular ring; 24 - sliding rod; 25 - arc groove; 26 - linkage device; 27 - rotating shaft; 28 - telescopic groove; 29 - first spring; 30 - trapezoidal block; 31 - first helical groove; 32 - first groove; 33 - second groove; 34 - second helical groove; 35 - rotating member; 36 - take-up reel; 37 - pull rope; 38 - first tension spring; 39 - flapping ring; 40 - chute; 41 - clamping block; 42 - clamping groove; 43 - second spring; 44 - stop block. Detailed implementation manner

[0029] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0030] Embodiment 1

[0031] Please refer to Figure 1 - Figure 2 , a thermocouple for measuring flue gas in the figure includes a junction box 1, a thermocouple tube 2, a cleaning device 3 and a driving device 4. The junction box 1 is fixedly connected to the thermocouple tube 2. The cleaning device 3 is installed on the thermocouple tube 2 and is used to clean the surface of the thermocouple tube 2, scrape the residual soot on the surface of the thermocouple tube 2 from one end of the junction box 1 to the other end and shake it off. The driving device 4 is installed on the junction box 1 and is used to drive the continuous operation of the cleaning device 3 by using the power when the soot flows.

[0032] Please refer to Figure 7 - Figure 10 , the cleaning device 3 in the figure includes a device ring 5. A device groove 6 is opened in the device ring 5. A plurality of sliders 7 are slidably connected in the device groove 6. One end of the slider 7 is fixedly connected to a cleaning brush 8 that is slidably connected to the surface of the thermocouple tube 2. An telescopic member 9 is provided in the device ring 5 for pushing out the cleaning brush 8 to clean the surface of the thermocouple tube 2 when the device ring 5 is away from one end of the junction box 1 and retracting the cleaning brush 8 into the device groove 6 when the device ring 5 is close to one end of the junction box 1. A flapping member 10 is provided on the device ring 5 for flapping and shaking off the dust on the surface of the cleaning brush 8 when the device ring 5 reaches the end of the thermocouple tube 2.

[0033] Please refer to Figure 2 - Figure 5, in the illustrated driving device 4, a protective shell 11 is fixedly installed on the junction box 1. A rotating ring 12 is rotatably connected inside the protective shell 11. A plurality of fan blades 13 are fixedly connected to the outer wall of the rotating ring 12. One end of the rotating ring 12 is coaxially and fixedly connected to a toothed ring 14 that is rotatably connected to the outer wall of the thermocouple tube 2. A plurality of guide rods 15 are fixedly connected to the side surface of the toothed ring 14. All the plurality of guide rods 15 penetrate through the device ring 5 and are slidably connected to the device ring 5. A reciprocating member 16 is provided on the protective shell 11 for driving the device ring 5 to reciprocate at both ends of the thermocouple tube 2.

[0034] In this embodiment, during the process of the thermocouple tube 2 measuring the flue gas temperature, the flow of the flue gas will drive the fan blades 13 to rotate, thereby driving the rotating ring 12 to rotate. The rotating ring 12 drives the toothed ring 14 to rotate, causing the guide rods 15 to drive the device ring 5 to rotate. At the same time, the rotation of the toothed ring 14 drives the reciprocating member 16 to operate, causing the device ring 5 to reciprocate between both ends of the thermocouple tube 2. When the device ring 5 moves to one end close to the junction box 1, the telescopic member 9 pushes the sliding block 7, causing the cleaning brush 8 to contact the surface of the thermocouple tube 2. After that, when the device ring 5 moves towards the end of the thermocouple tube 2, the cleaning brush 8 will continuously rotate and wipe on the surface of the thermocouple tube 2 along with the device ring 5, pushing the dust on the surface of the thermocouple tube 2 towards the end of the thermocouple tube 2. When the device ring 5 reaches the end of the thermocouple tube 2, the flapping member 10 will continuously flap the device ring 5, thereby shaking off the dust on the cleaning brush 8. After that, the telescopic member 9 moves the sliding block 7 to retract the cleaning brush 8 into the device slot 6, releasing the contact with the thermocouple tube 2. At this time, when the reciprocating member 16 drives the device ring 5 to move in the reverse direction, the cleaning brush 8 will not sweep the dust towards the end of the junction box 1, preventing dust from accumulating at one end of the thermocouple tube 2 close to the junction box 1. In this way, continuous cleaning of the surface of the thermocouple tube 2 and self-cleaning of the cleaning brush 8 can be achieved by cycling.

[0035] Embodiment 2

[0036] Please refer to Figure 6 - Figure 10 Referring to Embodiment 2, this embodiment further describes Embodiment 1. The reciprocating member 16 in the illustration includes a mounting frame 17 fixedly connected to the protective shell 11. A gear 18 meshing with the toothed ring 14 is rotatably connected to the mounting frame 17. The gear 18 is coaxially and fixedly connected to a reciprocating lead screw 19. A guide block 20 is threadedly connected to the reciprocating lead screw 19. An annular groove 21 is formed on the side surface of the device ring 5. A limiting ring 22 slidably connected to the annular groove 21 is fixedly connected to the guide block 20. One end of each of the guide rod 15 and the reciprocating lead screw 19 is fixedly connected with a stop block 44 for preventing the device ring 5 and the guide block 20 from slipping off.

[0037] Please refer to Figure 11 - Figure 12, the telescopic member 9 in the figure includes a circular ring 23 rotatably connected to the device groove 6. Slide bars 24 are fixedly connected to the sides of multiple slider blocks 7. Multiple arc grooves 25 respectively slidably connected to the multiple slide bars 24 are formed on the side of the circular ring 23. A linkage device 26 is provided in the device groove 6, which drives the circular ring 23 to rotate in different directions when the device ring 5 moves to both ends of the electric couple tube 2, so that the cleaning brush 8 extends and retracts.

[0038] Please refer to Figure 3 - Figure 5 and Figure 8 - Figure 12 , the linkage device 26 in the figure includes two rotating shafts 27 rotatably connected to the device groove 6. Multiple telescopic grooves 28 are formed on the surface of the rotating shaft 27. First springs 29 are fixedly connected in the multiple telescopic grooves 28. The first springs 29 are fixedly connected to trapezoidal blocks 30 slidably connected to the telescopic grooves 28. A first helical tooth groove 31 meshing with the trapezoidal block 30 is formed on the side of one end of any guide rod 15 close to the junction box 1, and a first groove 32 is formed on the side of the other end far from the junction box 1. A second groove 33 is formed on the side of one end of the other guide rod 15 close to the junction box 1, and a second helical tooth groove 34 meshing with another group of trapezoidal blocks 30 is formed on the side of the other end far from the junction box 1. A rotating member 35 for driving the circular ring 23 to rotate is provided on the rotating shaft 27.

[0039] In this implementation, when the fan blade 13 drives the rotating ring 12 to rotate, it drives the toothed ring 14 to rotate. The toothed ring 14 drives the gear 18 to rotate, causing the reciprocating lead screw 19 to rotate. The reciprocating lead screw 19 drives the guide block 20 to reciprocate on the reciprocating lead screw 19. The guide block 20 drives the limiting ring 22, causing the device ring 5 to reciprocate together with the limiting ring 22 under the limiting action of the annular groove 21, while not affecting the rotation of the device ring 5 itself. The device ring 5 is in a state of continuous reciprocating sliding relative to the guide rod 15. When the device ring 5 slides to the end of the electric coupling tube 2, the trapezoidal block 30 on one rotating shaft 27 continuously extends and slides with the second helical groove 34. When the device ring 5 moves in the reverse direction, the second helical groove 34 drives the trapezoidal block 30, causing the rotating shaft 27 to rotate. The trapezoidal block 30 on the other rotating shaft 27 is exactly at the position of the first groove 32 and is not limited, so that the rotating member 35 can rotate to drive the arc-shaped groove 25 to rotate, causing the sliding rod 24 to slide and drive the sliding block 7 to slide into the device groove 6. The cleaning brush 8 slides into the device groove 6 and disengages from the surface of the electric coupling tube 2. When the device ring 5 slides to the end of the electric coupling tube 2 close to the junction box 1, the trapezoidal block 30 on the other rotating shaft 27 continuously extends and slides with the first helical groove 31. When the device ring 5 moves in the reverse direction, the first helical groove 31 drives the trapezoidal block 30, causing the rotating shaft 27 to rotate. The trapezoidal block 30 on the other rotating shaft 27 is at the position of the second groove 33 and is not limited, so that the rotating member 35 causes the ring 23 to rotate in the reverse direction, driving the arc-shaped groove 25 to rotate in the reverse direction, causing the sliding block 7 and the cleaning brush 8 to slide out of the device groove 6, and the cleaning brush 8 contacts the surface of the electric coupling tube 2 for cleaning. When the trapezoidal block 30 is at a position other than the first groove 32 and the second groove 33, it is limited by the surface of the guide tube, and the rotating shaft 27 cannot rotate, thus completing the limiting function.

[0040] Example 3

[0041] Please refer to Figure 8 - Figure 10 Regarding Example 3, this example further elaborates on Example 1. In the illustration, the rotating member 35 includes a winding shaft 36 fixedly installed on the sides of two rotating shafts 27. A pull rope 37 is fixedly connected to the surface of the winding shaft 36, and the other end of the pull rope 37 is fixedly connected to the side of the ring 23.

[0042] Please refer to Figure 3 - Figure 5 and Figure 11 - Figure 12 , in the illustration, the flapping member 10 includes a first tension spring 38 fixedly installed on the side of the device ring 5. The first tension spring 38 is fixedly connected to a flapping ring 39 that is slidably connected to the guide rod 15. A plurality of sliding grooves 40 are formed in the flapping ring 39. A clamping block 41 that is slidably connected to the guide rod 15 is slidably connected in the sliding grooves 40. A plurality of clamping grooves 42 that are engaged with the clamping block 41 are formed on the side of the guide rod 15 away from the junction box 1. One end of the clamping block 41 is fixedly connected to a second spring 43 that is fixedly connected to the sliding grooves 40.

[0043] In this embodiment, when the rotating shaft 27 rotates, it will drive the winding shaft 36 to rotate and pull the pulling rope 37, causing the ring 23 to rotate. The pulling rope 37 on the other set of rotating shafts 27 is relaxed, thus completing the rotation of the ring 23. After that, it is difficult for the trapezoidal clamping block 30 to rotate in the reverse direction on the surface of the guide rod 15, and the limiting can be completed. When the device ring 5 slides to the end of the electric coupling tube 2, the clamping block 41 is pushed into the clamping groove 42 by the second spring 43, which will make it difficult for the flapping ring 39 to continue sliding with the device ring 5. The first tension spring 38 is stretched. When the first tension spring 38 is stretched to a certain extent, the clamping block 41 is pulled out of the clamping groove 42, and the flapping block is pulled by the first tension spring 38 to impact the device ring 5, so as to pat the dust on the cleaning brush 8. At this time, the cleaning brush 8 is still in the extended state, which is convenient for removing the dust. The lengths of the guide rod 15 and the reciprocating lead screw 19 are both longer than the length of the electric coupling tube 2, which is convenient for completely wiping the dust on the electric coupling tube 2.

[0044] It should be noted that in this article, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the term "comprising", "including" or any other variation thereof is intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements not only includes those elements, but also includes other elements not expressly listed, or also includes elements inherent to such process, method, article or device.

[0045] Although the embodiments of the present invention have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principle and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A thermocouple for measuring flue gas, characterized in that, it includes: a junction box and a thermocouple tube, and the junction box is fixedly connected to the thermocouple tube; It further includes: a cleaning device, which is installed on the thermocouple tube and is used to clean the surface of the thermocouple tube, scraping the residual soot on the surface of the thermocouple tube from one end of the junction box to the other end and shaking it off; a driving device, which is installed on the junction box and is used to drive the continuous operation of the cleaning device by using the power when the soot flows; The cleaning device includes a device ring, a device groove is opened in the device ring, and a plurality of sliding blocks are slidably connected in the device groove. One end of the sliding block is fixedly connected with a cleaning brush that is slidably connected to the surface of the thermocouple tube. An expansion member is provided in the device ring for pushing out the cleaning brush to clean the surface of the thermocouple tube when the device ring is far from one end of the junction box, and retracting the cleaning brush into the device groove when the device ring is close to one end of the junction box; The driving device includes a protective shell fixedly installed on the junction box. A rotating ring is rotatably connected in the protective shell. A plurality of fan blades are fixedly connected to the outer wall of the rotating ring. One end of the rotating ring is coaxially fixedly connected with a toothed ring that is rotatably connected to the outer wall of the thermocouple tube. A plurality of guide rods are fixedly connected to the side surface of the toothed ring. All the plurality of guide rods penetrate through the device ring and are slidably connected to the device ring. A reciprocating member is provided on the protective shell for driving the device ring to reciprocate at both ends of the thermocouple tube; The expansion member includes a circular ring rotatably connected to the device groove. A sliding rod is fixedly connected to the side surface of each of the plurality of sliding blocks. A plurality of arc-shaped grooves respectively slidably connected to the plurality of sliding rods are opened on the side surface of the circular ring. A linkage device is provided in the device groove for driving the circular ring to rotate in different directions when the device ring moves to both ends of the thermocouple tube, so that the cleaning brush extends and retracts; The linkage device includes two rotating shafts rotatably connected to the device groove. A plurality of expansion grooves are opened on the surface of the rotating shaft. A first spring is fixedly connected in each of the plurality of expansion grooves. The first spring is fixedly connected with a trapezoidal block that is slidably connected to the expansion groove. A first inclined tooth groove meshing with the trapezoidal block is opened on the side surface of one end of any one of the guide rods close to the junction box, and a first groove is opened on the side surface of the end far from the junction box. A second groove is opened on the side surface of one end of the other guide rod close to the junction box, and a second inclined tooth groove meshing with another group of trapezoidal blocks is opened on the side surface of the end far from the junction box. A rotating member is provided on the rotating shaft for driving the circular ring to rotate; The rotating member includes a winding shaft fixedly installed on the side surfaces of the two rotating shafts. A pull rope is fixedly connected to the surface of the winding shaft. The other end of the pull rope is fixedly connected to the side surface of the circular ring.

2. The thermocouple for measuring flue gas according to claim 1, characterized in that: The reciprocating member includes a mounting frame fixedly connected to the protective housing. A gear meshing with the toothed ring is rotatably connected to the mounting frame. The gear is coaxially and fixedly connected with a reciprocating lead screw. A guide block is threadedly connected to the reciprocating lead screw. An annular groove is formed in the side surface of the device ring. A limiting ring slidably connected to the annular groove is fixedly connected to the guide block.

3. A thermocouple for measuring flue gas according to claim 1, characterized in that: A flapping member for flapping and shaking off the dust on the surface of the cleaning brush when the device ring reaches the end of the thermocouple tube is provided on the device ring. The flapping member includes a first tension spring fixedly installed on the side surface of the device ring. The first tension spring is fixedly connected with a flapping ring slidably connected to the guide rod. A plurality of sliding grooves are formed in the flapping ring. A clamping block slidably connected to the sliding groove and slidably connected to the guide rod is arranged in the sliding groove. A plurality of clamping grooves engaged with the clamping block are formed in the side surface of the guide rod away from the junction box. One end of the clamping block is fixedly connected with a second spring fixedly connected with the sliding groove.

4. A thermocouple for measuring flue gas according to claim 2, characterized in that: Stop blocks for preventing the device ring and the guide block from slipping are fixedly connected to one ends of the guide rod and the reciprocating lead screw respectively.

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