A thermocouple protection tube inner wall cleaning device

Abstract

This invention belongs to the field of cleaning equipment technology, addressing the technical problems of low automation, large footprint, and inconvenience in the use of existing cleaning equipment. It discloses a cleaning device for the inner wall of a thermocouple protection tube, comprising a flexible shaft, an outer bushing, and an inner core, with an annular gap between the core and bushing, allowing the core to rotate freely within the bushing; a rotational power source with its output end connected to the core; and a friction traction mechanism with adjustable-spaced friction surfaces that contact the flexible shaft and provide frictional force to drive its forward and backward movement. This invention offers a high degree of automation; the flexible shaft inserts into the inner wall of the protection tube, replacing manual cleaning actions of forward, backward, and rotation, while reducing the labor intensity of workers. During cleaning, the protection tube itself remains stationary, reducing preparation steps, and the coiled storage significantly reduces space limitations.

Description

Technical Field

[0001] This invention belongs to the field of cleaning equipment technology, specifically relating to a cleaning device for the inner wall of a thermocouple protection tube. Background Technology

[0002] A thermocouple is a temperature-sensing element that measures temperature based on the Seebeck effect: two conductors of different compositions are welded together to form a closed circuit. When there is a temperature difference between the two junctions, a thermoelectric potential is generated in the circuit. The magnitude of this potential depends only on the properties of the conductor materials and the temperature difference between the two ends.

[0003] The structure of an armored thermocouple includes thermocouples (thermocouple wires of different materials), high-purity, dense magnesium oxide (MgO) insulating material, and a metal protective tube. Specifically, two thermocouples of different materials are arranged parallel to each other along the axial direction. High-purity magnesium oxide insulating powder is tightly filled between the thermocouples and the metal protective tube. After the three are integrally stretched and formed, the magnesium oxide layer is compacted into a dense solid, which centrally positions the thermocouples and insulates them from the sheath. At the same time, the metal protective tube acts as an outer shell, providing mechanical protection and environmental isolation.

[0004] Before assembly, the inner wall of the metal protective tube needs to be cleaned to remove oil, dust, and moisture (collectively referred to as impurities) adhering to the inner wall, preventing impurities from mixing into the magnesium oxide insulation material. The introduction of impurities can lead to: 1. Deterioration of insulation performance; 2. Inability of the magnesium oxide insulation material to adhere tightly to the inner wall of the metal protective tube (inconsistent overall thermal response); 3. Corrosion of the inner wall of the metal protective tube by acidic / alkaline substances at high temperatures, shortening the thermocouple life.

[0005] Existing cleaning equipment such as Figure 1 As shown, the output end of the geared motor 12 is connected to a long shaft 13, and its start and stop are controlled by a foot switch 15 (located on the side of the worker). The long shaft 13 is placed on the cleaning table 11, and a cleaning tool 14 is installed at one end. The long shaft 13 is very long, longer than the length of the protective tube to be cleaned (the protective tube is generally tens of meters or even more). The worker stands at the end away from the geared motor 12 and puts the protective tube over the outside of the long shaft 13. The cleaning tool 14 and the long shaft 13 rotate slowly under the drive of the geared motor 12 to clean the inner wall of the tube. The worker continuously pushes out the protective tube so that the cleaning tool 14 can clean the entire inner wall of the protective tube.

[0006] The above-mentioned cleaning equipment has the following problems in actual use: 1. The site requirements are very high because the protective pipe itself is very long. This means that if the long shaft 13 is to cover the length of the protective pipe, it needs to be longer than the protective pipe itself. Consequently, the cleaning station 11 below also needs to be made in a very long size. For example, for a 20-meter protective pipe, a long shaft 13 of at least 20 meters is required. When the staff puts the protective pipe into the long shaft 13, the total length of this workstation must be at least 40 meters. 2. When moving longer protective tubes to the end of the long shaft 13, at least two workers are needed to move the protective tubes stably to avoid deformation. After cleaning, the tubes need to be moved again. 3. During cleaning, the protective tube needs to be continuously pushed out, and even moved back and forth, to clean the inner wall of the protective tube multiple times. This kind of physical labor is extremely unfriendly to the staff. 4. During cleaning, the protective tube is constantly moving and interacting with the external environment, which can easily cause damage to the outer surface, leading to a decrease in the yield rate. Summary of the Invention

[0007] In view of the technical problems of existing cleaning equipment, such as low automation, large space occupation, and inconvenience of use, the purpose of this invention is to provide a cleaning device for the inner wall of thermocouple protection tubes.

[0008] To achieve the above-mentioned technical objectives, the technical solution adopted by the present invention is as follows: A thermocouple protection tube inner wall cleaning device, comprising A flexible shaft has an outer bushing and an inner core, with an annular gap between the core and the bushing, and the core having the freedom to rotate within the bushing. A rotary power source, the output end of which is connected to the shaft core; A friction traction mechanism includes relatively arranged and adjustable friction surfaces for contacting the flexible shaft and providing frictional force as the power to drive the flexible shaft forward and backward; and The take-up and unwind rack is used to take up and unwind the flexible shaft. The rotary power source is mounted on the take-up and unwind rack and rotates synchronously with it. The end of the bushing near the take-up and unwind rack is fixed to the rack.

[0009] In this invention, a cleaning unit (such as a cleaning cloth soaked in detergent) is installed at the end of the flexible shaft, which is inserted into the inside of the protective tube to perform cleaning actions (forward, backward, rotation). In terms of forward and backward movement, the friction traction mechanism is used. The flexible shaft is clamped between opposing friction surfaces (clamping can increase the normal pressure at the traction point, thereby increasing the maximum friction force; on the other hand, it is better to use a material with a high coefficient of friction for the friction surfaces). When the friction surfaces move, the bushing and core of the flexible shaft will be driven to move together under the action of friction. By controlling the direction of movement of the friction surfaces, the forward or backward movement of the flexible shaft can be controlled, thereby controlling the entry / exit of the flexible shaft into / out of the protective tube. In terms of rotation, such as Figure 5 Because there is an annular gap between the shaft core and the bushing, the existence of the annular gap can reduce the interference and restriction of the bushing on the rotation of the shaft core, provide relatively free space for the rotation of the shaft core, and reduce the difficulty of the shaft core rotation. In addition, the annular gap can also serve as a storage space for rust-preventive lubricant, which further reduces the difficulty of the shaft core rotation. The rotational power of the shaft core is provided by a rotational power source. The take-up and unwind rack neatly stores the flexible shaft, reducing storage space. It efficiently unwinds and rewinds the flexible shaft through its own rotation. During unwinding, a portion of the flexible shaft, pulled by the friction traction mechanism, drives the take-up and unwind rack to rotate, releasing a portion of the flexible shaft still in a coiled state. During rewinding, the retraction of the flexible shaft causes the take-up and unwind rack to rotate in the opposite direction, thus achieving winding and rewinding of the flexible shaft. Because the flexible shaft rotates about the rotation center of the take-up and unwind rack during unwinding and rewinding, to ensure the connection between the rotational power source and the shaft core power, the relative position between the rotational power source and the shaft core end needs to remain unchanged. Therefore, the rotational power source also needs to be mounted on the take-up and unwind rack and rotate synchronously with it. One end of the bushing is fixed to the take-up and unwind rack, preventing misalignment between the bushing and the flexible shaft in the length direction and providing a force application point for the bushing during rewinding. In summary, the friction traction mechanism in this invention controls the flexible shaft to move forward / backward, and the rotational power source drives the shaft core, thereby enabling the cleaning unit to perform cleaning actions such as forward, backward, and rotation without the need for manual cleaning. In terms of saving space, the flexible shaft is coiled and stored using a winding rack. When cleaning a 20-meter-long protective tube, although the length of the flexible shaft also needs to be greater than 20 meters, the flexible shaft can be slowly unwound from the limited space starting from the coiled state, thus greatly reducing the space requirements. In addition, the protective tube can be cleaned on the shelf without being removed, as it only requires inserting the flexible shaft into the protective tube, which also reduces the labor intensity of the staff. During the cleaning process, the protective tube itself no longer moves, but the cleaning action is carried out by a flexible shaft, which avoids the outer surface of the protective tube from being bumped or deformed due to movement (deformation will affect the subsequent insertion of magnesium oxide insulation material).

[0010] In some optional instances, an electric motor is chosen as the rotational power source.

[0011] As a preferred technical solution of the present invention, the friction surfaces arranged opposite to each other and with adjustable spacing in the friction traction mechanism are constructed using two friction rollers, which are driven by power to move the friction surfaces.

[0012] As a preferred technical solution of the present invention, the friction traction mechanism includes track one and track two, which are arranged opposite to each other to form opposite friction surfaces and the distance between them is adjustable. Track 1 and Track 2 are tensioned by pulleys; The pulley that cooperates with track one or track two is connected to the active power source.

[0013] In this invention, track one and track two adjust their relative distance to accommodate flexible shafts of different diameters; Using a track design increases the contact area with the flexible shaft surface, making the transfer of the flexible shaft smoother when clamped. After track one and track two are tensioned, the active power source provides the power for movement. Either track one can choose to receive power from the active power source, or they can receive power from different active power sources. Since the relative distance between track one and track two needs to be adjusted, the preferred method is to choose one to receive power, while the track that does not receive power acts as the moving end and the relative distance is adjusted. In actual production, the choice can be made flexibly according to the needs.

[0014] As a preferred technical solution of the present invention, it also includes a frame, wherein a rotating shaft is mounted on the frame via a bearing, and the take-up and take-down frame is fixedly mounted on the rotating shaft; The rotating shaft is equipped with a first synchronous pulley, which is connected to a second synchronous pulley in the detection and limiting mechanism via a synchronous belt. The detection and limiting mechanism is installed on the frame and is used to determine whether the number of rotations of the take-up and unwinding frame has reached the limit of take-up and unwinding.

[0015] This invention transmits the rotational motion of the unwinding frame to the detection and limiting mechanism via a first synchronous pulley, a synchronous belt, and a second synchronous pulley. The detection and limiting mechanism determines whether the limit has been reached. If the detection and limiting mechanism determines that the limit position has been reached, it sends a signal as the input for the motion control of the friction traction mechanism. When unwinding is complete, the flexible shaft is fully pulled out. At this point, unwinding and traction must be stopped to avoid damage to the flexible shaft due to tension or failure of the connection point at the end of the flexible shaft. When the flexible shaft is fully wound up, winding and traction must also be stopped to avoid the friction traction mechanism from doing useless work.

[0016] The beneficial effects of this invention are: 1. High degree of automation: The flexible shaft inserts into the inside of the protective tube to replace manual cleaning actions such as forward, backward, and rotation, while reducing the labor intensity of workers; 2. During the cleaning process, the protective tube itself does not move, thus avoiding damage or deformation to the outer surface of the protective tube due to movement; 3. The use of a winding and unwinding rack for coiling and storing flexible shafts significantly reduces space requirements while making winding and unwinding very smooth and reducing the frequency of human intervention; 4. The flexible shaft is easy to disassemble and replace; 5. The cleaning action of the flexible shaft is stable and easy to control. In terms of ease of control, by controlling the friction traction mechanism and the rotational power source, the flexible shaft can stop at a certain axial position of the protective tube for rotational cleaning, or it can perform reciprocating cleaning on a certain section of the protective tube along the axial direction. Of course, a combination of the two actions is also possible. In the stable direction of action, the shaft core is constrained within the internal space of the bushing and rotates with a small amplitude of rotation, which will not cause the protective tube to be cleaned to be subjected to force and swing erratically. In addition, the flexible shaft is held by the two friction surfaces of the friction traction mechanism, and the forward and backward movement of the flexible shaft is controlled by the friction traction mechanism. By controlling the traction speed of the friction traction mechanism, the feed speed of the flexible shaft can be effectively controlled to avoid axial movement. The above-mentioned stable cleaning action can not only ensure the cleaning effect, but also prevent the protective tube from axial movement and swinging during the cleaning process. Attached Figure Description

[0017] The present invention can be further illustrated by the non-limiting embodiments given in the accompanying drawings; Figure 1 This is a schematic diagram of the structure of existing cleaning equipment; Figure 2 This is a front view of an embodiment of the present invention; Figure 3 For the embodiments of the present invention in Figure 2 A magnified view of a section at point A in the middle; Figure 4 This is an isometric view of an embodiment of the present invention with the friction traction mechanism and detection limiting mechanism concealed. Figure 5 For the embodiments of the present invention in Figure 4 A magnified view of a section at point B in the middle; Figure 6 This is a schematic diagram of the structure of the take-up and take-down rack in an embodiment of the present invention; Figure 7 This is a schematic diagram of the friction traction mechanism in an embodiment of the present invention; Figure 8 This is a schematic diagram of the internal structure of the detection and limiting mechanism in an embodiment of the present invention; Figure 9 This is a schematic diagram of the engagement between the card plate and gear one in an embodiment of the present invention; The symbols for the main components are explained below: 11. Cleaning station; 12. Gear motor; 13. Long shaft; 14. Cleaning tools; 15. Foot switch; 200. Rack; 300. Retractable rack; 310. Side plate; 320. Outer ring; 330. Inner ring; 341. Inner stop bar; 342. Outer stop bar; 350. Rotating shaft; 360. Conductive slip ring; 400, Flexible shaft; 410, Bushing; 420, Shaft core; 500. Friction traction mechanism; 511. Track 1; 520. Moving box; 521. Track 2; 531. Guide rod; 532. Lead screw 1; 533. Handwheel; 600. Detection and limit mechanism; 610. Lead screw II; 620. Synchronous pulley II; 630. Gear I; 640. Gear II; 650. Limit switch I; 660. Limit switch II; 670. Clamping plate; 700, grid-shaped conductor frame; 800. Rotary power source; 900, Synchronous Belt. Detailed Implementation

[0018] The technical solutions of the present invention will be described in detail below with reference to specific embodiments and accompanying drawings. The embodiments described herein are specific implementations of the present invention, used to illustrate the concept of the present invention; these descriptions are explanatory and exemplary, and should not be construed as limiting the implementation methods or the scope of protection of the present invention. In addition to the embodiments described herein, those skilled in the art can employ other obvious technical solutions based on the content disclosed in the claims and specification of this application. These technical solutions include those that make any obvious substitutions and modifications to the embodiments described herein. Example

[0019] like Figures 2-9 As shown, this embodiment provides a thermocouple protection tube inner wall cleaning device, including, The control box includes a traction switch, forward button, reverse button, power switch, and indicator lights. The frame 200 has a rotating shaft 350 mounted on it via bearings. The rotating shaft 350 is fixedly mounted with a take-up and take-up frame 300. The take-up and take-up frame 300 has a side plate 310, and an inner stop bar 341 and an outer stop bar 342 are arranged on the side plate 310. The end of the inner stop bar 341 away from the side plate 310 is connected to an inner ring 330, and the end of the outer stop bar 342 away from the side plate 310 is connected to an outer ring 320. The flexible shaft 400 is coiled by an inner stop bar 341 of the take-up and take-down frame 300 and has an outer bushing 410 and an inner core 420. There is an annular gap between the core 420 and the bushing 410. The core 420 has the freedom to rotate in the bushing 410. The end of the bushing 410 near the take-up and take-down frame 300 is fixed to the take-up and take-down frame 300. A rotary power source 800 has its output end connected to the shaft core 420. The rotary power source 800 is mounted on the take-up and take-down rack 300 and rotates synchronously with the take-up and take-down rack 300. A conductive slip ring 360 that supplies power to the rotary power source 800 is mounted on the rotating shaft 350. The rotating end of the inner side of the conductive slip ring 360 is fixed to the rotating shaft 350 and electrically connected to the rotary power source 800. The stationary end of the outer side of the conductive slip ring 360 is fixed to the frame 200. A cleaning cloth is attached to the end of the shaft core 420 away from the rotating power source 800; Friction traction mechanism 500 is mounted on frame 200 and includes a lower track 511 and an upper track 521. The pulley that cooperates with track 511 is connected to a motor-type active power source. Track 521 is integrated into a movable box 520 after being tensioned. The movable box 520 is slidably connected to guide rod 531 through a sleeve. The movable box 520 is threadedly connected to lead screw 532. A handwheel 533 is installed at the upper end of lead screw 532. There are two grid-shaped guide frames 700, which are respectively arranged on the front and rear sides of the friction traction mechanism 500 in the traction direction. The height and lateral position of the flexible shaft 400 entering and exiting the friction traction mechanism 500 are specified. A first synchronous pulley is mounted on the rotating shaft 350. The first synchronous pulley is connected to a second synchronous pulley 620 in the detection and limiting mechanism 600 via a synchronous belt 900. The detection and limiting mechanism 600 includes a housing. A second lead screw 610 is rotatably mounted on the housing. The second synchronous pulley 620 is mounted on the end of the second lead screw 610. The second lead screw 610 is threadedly connected to a first gear 630 and a second gear 640. A bent clamping plate 670 is mounted on the housing. The clamping plate 670 is inserted into the tooth grooves of the first gear 630 and the second gear 640 to restrict the rotation of the first gear 630 and the second gear 640. A first limit switch 650 and a second limit switch 660 are fixedly mounted on the housing. When the first gear 630 triggers the first limit switch 650, the friction traction mechanism 500 stops the traction of the flexible shaft 400 in the unwinding direction. When the second gear 640 triggers the second limit switch 660, the friction traction mechanism 500 stops the traction of the flexible shaft 400 in the winding direction.

[0020] In this embodiment, as Figure 2 , 4 The flexible shaft 400 is coiled on the take-up and take-down rack 300, guided by the grid guide frame 700, and the end of the flexible shaft 400 passes through the friction traction mechanism 500 and then enters the protective tube that needs to be cleaned. Regarding coils, such as Figure 6 The flexible shaft 400 is coiled by an inner stop bar 341, and the outer stop bar 342 can restrict the flexible shaft 400 from loosening outward. The inner ring 330 at the end of the inner stop bar 341 and the outer ring 320 at the end of the outer stop bar 342 have the same function: to increase structural strength and avoid the risk of exposed ends. When unwinding, such as Figure 7When the active power source in the friction traction mechanism 500 is powered on and rotates, the power is transmitted to the track 511 below via the pulley. The track 511 drives the flexible shaft 400 to penetrate into the protective tube through friction. As the front part of the flexible shaft 400 is continuously pulled out, the retractor 300 will also rotate continuously to release the flexible shaft 400 which is still in a coiled state. The track 521 on the moving box 520 presses down on the flexible shaft 400 and provides positive pressure, so that the friction can reach the ideal value. In order to provide different degrees of compression and adapt to flexible shafts 400 of different diameters, the moving box 520 is slidably connected to the guide rod 531 through the sleeve and threadedly connected to the moving box 520 through the lead screw 532. Thus, by rotating the lead screw 532 through the handwheel 533, the moving box 520 can move up and down under the limit of the guide rod 531. The principle of winding is actually the same as that of unwinding; simply reverse the rotation of the active power source. The unwinding control flexible shaft 400 moves forward, and the rewinding control flexible shaft 400 moves backward. To enhance the cleaning ability of the cleaning cloth at the end of the shaft core 420, such as... Figure 6 The rotary power source 800 is powered on and rotates through the conductive slip ring 360, driving the shaft core 420 to rotate in the bushing 410, and finally driving the cleaning cloth at the end to rotate. In addition, since the unwinding and rewinding frame 300 rotates during both unwinding and rewinding, in order to know whether the length of the flexible shaft 400 extended or retracted by the unwinding frame 300 has reached its limit, such as... Figure 8 , 3 A detection and limit mechanism 600 is specially designed. The unwinding / rewinding frame 300 and the rotating shaft 350 rotate together. The synchronous pulley 1 on the rotating shaft 350 transmits the rotational motion to the synchronous pulley 2 620 of the detection and limit mechanism 600 via the synchronous belt 900. The synchronous pulley 2 620 is mounted on the lead screw 2 610, so the lead screw 2 610 will rotate accordingly. The lead screw 2 610 uses its own rotation as input to cause the limit gears 1 630 and 2 640 to move axially along the lead screw 2 610. The direction of their movement is determined by the rotation direction of the lead screw 2 610, and further determined by the unwinding and rewinding. When the unwinding reaches its limit, gear 1 630... Triggering limit switch 650 stops the friction traction mechanism 500 from pulling the flexible shaft 400 in the unwinding direction. When winding reaches the limit, gear 640 triggers limit switch 660, stopping the friction traction mechanism 500 from pulling the flexible shaft 400 in the winding direction. The installation positions of limit switches 650 and 660 determine the trigger points. In actual installation, unwinding or winding to the limit can be performed first, and the positions of gears 630 and 640 can be observed. By comparing these positions, limit switches 650 and 660 can be installed. Further explanation regarding the clamping plate 670 is provided here. Figure 8 , 9Because when adjusting the initial positions of gear 630 and gear 640, it is necessary to remove the limiting position of gear 630 and gear 640, the clamping plate 670 is designed to be bent, which allows for a certain degree of deformation at the bend. This makes it easier to remove the limiting position of clamping plate 670. Simply bend clamping plate 670 manually. When limiting, the upper edge of clamping plate 670 is re-engaged into the tooth groove through the restoration of deformation. The bending design should ideally ensure that the limiting force direction of clamping plate 670 is perpendicular to the force direction of its own disengagement from the tooth groove. This can avoid deformation affecting the limiting function. In addition, the bending shape can change the position of the upper edge of clamping plate 670 after it is formed, breaking through the limitation of its own installation position, thereby selecting a convenient slot position for limiting engagement. If clamping plate 670 is a straight plate, then the available tooth groove positions are very limited, and the corresponding installation positions of clamping plate 670 are also very few. The bending shape allows for the selection of a more suitable installation position, a more suitable tooth groove for engagement, and a simpler way to remove the limiting position. In summary, this embodiment achieves efficient and automatic cleaning of the protective tube by driving the flexible shaft 400 forward and backward and the shaft core 420 to rotate. The protective tube can be cleaned without being removed from the shelf, greatly saving on pre-cleaning preparation. The annular gap between the shaft core 420 and the bushing 410 ensures that the shaft core 420 can rotate independently, and the gap can also be used to add rust-preventive lubricant. Regarding the driving of the movement, the rotary power source 800 supplies rotational power to the shaft core 420 independently. The power supply problem of the rotary power source 800 is solved through the structural design of the take-up and put-down rack 300 and the cooperation of the conductive slip ring 360. Because the shaft core 420 rotates with the take-up and put-down rack 300, if the rotary power source 800 is detached from the take-up and put-down rack 300, power cannot be transmitted to the shaft core 420. Therefore, by connecting the rotary power source 800 and the take-up and put-down rack 300... When setting up the equipment, the problem of wire rotation and tangling arises. The forward and backward movement of the flexible shaft 400 is implemented by the friction traction mechanism 500. Considering the usage requirements of flexible shafts 400 with different diameters and clamping and pressurizing requirements, an adjustable function is also designed. Here, we additionally provide the operation method for replacing the flexible shaft 400. Simply unwind all the original flexible shafts 400, disconnect the connection points, and connect the new flexible shafts 400 to rewind. The whole process is very simple. Finally, this embodiment also considers the limits and safety issues of unwinding and rewinding. The detection and limit mechanism 600 effectively monitors and controls the unwinding and rewinding. In summary, this embodiment aims to save space and achieve forward, backward, and rotational cleaning actions in a simple and efficient manner. It constructs a systematic and efficient cleaning device that overcomes the problems of multi-action implementation, multi-size adaptation, power supply, storage, and ease of operation that need to be faced in the cleaning process.

[0021] The above embodiments are merely illustrative of the principles and effects of the present invention and are not intended to limit the present invention. Any person skilled in the art can modify or alter the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or alterations made by those skilled in the art without departing from the spirit and technical concept disclosed in the present invention should still be covered by the claims of the present invention.

Claims

1. A device for cleaning the inner wall of a thermocouple protection tube, characterized in that: include A flexible shaft (400) has an outer bushing (410) and an inner core (420), with an annular gap between the core (420) and the bushing (410), and the core (420) having a degree of freedom to rotate within the bushing (410); A rotary power source (800) has its output end connected to the shaft core (420); The friction traction mechanism (500) is provided with friction surfaces arranged opposite each other and with adjustable spacing, for contacting the flexible shaft (400) and providing friction force as the power to drive the flexible shaft (400) forward and backward; The take-up and untake-down frame (300) winds up and unwinds the flexible shaft (400). The rotary power source (800) is mounted on the take-up and untake-down frame (300) and rotates synchronously with the take-up and untake-down frame (300). The bushing (410) is fixed to the take-up and untake-down frame (300) at one end near the take-up and untake-down frame (300).

2. The thermocouple protection tube inner wall cleaning device according to claim 1, characterized in that: The friction traction mechanism (500) includes track one (511) and track two (521), which are arranged opposite to each other to form opposite friction surfaces and the distance between them is adjustable. Track 1 (511) and track 2 (521) are tensioned by pulleys; The pulley that cooperates with track one (511) or track two (521) is connected to the active power source.

3. The thermocouple protection tube inner wall cleaning device according to claim 1, characterized in that: The friction traction mechanism (500) includes a lower track one (511) and an upper track two (521). The pulley that mates with the track (511) is connected to the active power source; After tensioning, the second track (521) is integrated into the movable box (520). The movable box (520) is slidably connected to the guide rod (531) through a sleeve. The movable box (520) is threadedly connected to the first lead screw (532).

4. A thermocouple protection tube inner wall cleaning device according to any one of claims 1 to 3, characterized in that: It also includes a grid-shaped guide frame (700), of which there are two and are respectively arranged on the front and rear sides of the friction traction mechanism (500) in the traction direction.

5. The thermocouple protection tube inner wall cleaning device according to claim 1, characterized in that: The take-up and take-down rack (300) is provided with a side plate (310), and an inner stop bar (341) and an outer stop bar (342) are arranged on the side plate (310). The end of the inner stop bar (341) away from the side plate (310) is connected to the inner ring (330), and the end of the outer stop bar (342) away from the side plate (310) is connected to the outer ring (320).

6. The thermocouple protection tube inner wall cleaning device according to claim 1, characterized in that: It also includes a frame (200) on which a rotating shaft (350) is mounted via bearings; The take-up and take-down rack (300) is fixedly mounted on the rotating shaft (350), and the rotating shaft (350) is equipped with a conductive slip ring (360) that supplies power to the rotating power source (800). The inner rotating end of the conductive slip ring (360) is fixed to the rotating shaft (350) and electrically connected to the rotating power source (800), while the outer stationary end of the conductive slip ring (360) is fixed to the frame (200).

7. The thermocouple protection tube inner wall cleaning device according to claim 1, characterized in that: It also includes a frame (200), on which a rotating shaft (350) is mounted via bearings, and the take-up and take-down rack (300) is fixedly mounted on the rotating shaft (350); The rotating shaft (350) is equipped with a first synchronous pulley, which is connected to a second synchronous pulley (620) in the detection and limiting mechanism (600) via a synchronous belt (900); The detection limiting mechanism (600) is installed on the frame (200) and is used to determine whether the number of rotations of the take-up and unwinding frame (300) has reached the limit of take-up and unwinding.

8. The thermocouple protection tube inner wall cleaning device according to claim 7, characterized in that: The detection limiting mechanism (600) includes a housing; The housing is rotatably mounted with lead screw two (610), the synchronous pulley two (620) is mounted on the end of lead screw two (610), and lead screw two (610) is threadedly connected to gear one (630) and gear two (640). The housing is fitted with a bent clamp (670), which is inserted into the tooth grooves of gear one (630) and gear two (640) to restrict the rotation of gear one (630) and gear two (640); The housing is fixedly equipped with limit switch one (650) and limit switch two (660). When the gear one (630) triggers the limit switch one (650), the friction traction mechanism (500) stops the traction of the flexible shaft (400) in the unwinding direction; when the gear two (640) triggers the limit switch two (660), the friction traction mechanism (500) stops the traction of the flexible shaft (400) in the winding direction.

9. A thermocouple protection tube inner wall cleaning device according to claim 1, characterized in that: It also includes a control box, with the end of the shaft (420) away from the rotational power source (800) connected to the cleaning unit.

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