Device for cutting filamentous foreign matter between nuclear power steam generator tubes and method of use

Abstract

The application discloses a nuclear power steam generator inter-tube fine filament fixed foreign matter cutting device and a use method thereof. The nuclear power steam generator inter-tube fine filament fixed foreign matter cutting device comprises a cutting belt body assembly, a driving assembly, a cutting assembly, a connecting assembly, an expansion assembly and a height adjusting assembly. The nuclear power steam generator inter-tube fine filament fixed foreign matter cutting device drives the cutting assembly to cut the fine filament fixed foreign matter by the driving assembly, so that the cutting function of the cutting device is realized. Meanwhile, the height of the connecting assembly in the nuclear power steam generator tube bundle is adjusted by the height adjusting assembly, so that the height of the cutting assembly meets the cutting requirement. In addition, after the expansion of the expansion assembly, the nuclear power steam generator inter-tube fine filament fixed foreign matter cutting assembly is fixed in the tube bundle of the nuclear power steam generator, so that the fixing and the limiting of the cutting assembly during cutting are ensured, and potential damage to the heat transfer tube of the nuclear power steam generator is avoided.

Description

Technical Field

[0001] This invention relates to the field of steam generator maintenance, and more particularly to a device for fixing and cutting foreign objects in the inter-tube structure of a nuclear power steam generator, and its method of use. Background Technology

[0002] The steam generator is a crucial piece of equipment in nuclear power plants used for heat exchange in the primary and secondary loops, containing tens of thousands of tube bundles. During each reactor shutdown and maintenance, the secondary side tube sheet of the steam generator is cleaned and then inspected via video. Occasionally, fine, filamentous foreign objects are encountered during these inspections; these objects are wrapped around sections of the tube bundles. While conventional foreign object removal tools (such as alligator pliers, three-jaw tongs, and grappling hooks) can grasp them, the entanglement force prevents effective removal. Therefore, the filamentous foreign object must be cut before it can be grasped.

[0003] Because the gap between the steam generator tubes is only 8mm, and the foreign object cutting device needs to be introduced through the handhole and make at least one 90° bend before reaching the location of the foreign object to be cut, the safety of the heat transfer tubes must be ensured during the foreign object cutting process to avoid wear or damage. Therefore, the safety and convenience of the foreign object cutting device are particularly important. Existing technologies still have some problems in field applications, such as insufficient shearing force, making it difficult to remove strip-shaped foreign objects wrapped around the heat transfer tubes or stuck between tube bundles; difficulty in controlling filamentous foreign objects to enter the effective shearing position of the cutting tool; the lack of adjustable height of the cutting tool, limiting its adaptability; difficulty in ensuring cutting safety to avoid damage to the heat transfer tubes during cutting; or the lack of an effective driving method, resulting in limited movement of the cutting device between tubes. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to provide a device for cutting and fixing foreign objects in the inter-tube structure of a nuclear power steam generator.

[0005] The technical solution adopted by the present invention to solve its technical problem is: to construct a cutting device for fixing foreign objects in thin wires between tubes of a nuclear power steam generator, which includes a cutting belt assembly, a driving assembly, a cutting assembly, a connecting assembly, a tightening assembly, and a height adjustment assembly;

[0006] The connecting component is connected to one end of the cutting strip assembly, and the cutting component is mounted on the connecting component and used to cut the filamentous fixed foreign object;

[0007] The drive component is connected to the end of the cutting strip assembly away from the connecting component and is connected to the cutting assembly in a transmission manner, and is used to drive the cutting assembly to move.

[0008] The expansion assembly is connected to the cutting strip assembly, and after the expansion assembly expands, it is fixed inside the tube bundle of the nuclear power steam generator.

[0009] The height adjustment component is mounted on the connecting component and is used to adjust the height of the connecting component within the tube bundle of the nuclear power steam generator.

[0010] In some embodiments, the cutting belt assembly includes an upper belt, a drive belt, a lower belt, and a connecting belt;

[0011] The upper belt, the driving belt, and the lower belt are connected sequentially from top to bottom. The connecting belt is connected to the upper belt, the driving belt, and the lower belt, and is also connected to the connecting assembly.

[0012] In some embodiments, the drive belt body is provided with a synchronous belt tooth structure;

[0013] The upper belt, the driving belt, the lower belt, and the connecting belt are all made of plastic.

[0014] The upper belt, the driving belt, the lower belt, and the connecting belt are connected to each other by riveting, sewing, or hot pressing.

[0015] In some embodiments, the connecting assembly includes a first support frame and a second support frame, wherein the first support frame and the second support frame are connected by a fixing pin;

[0016] The upper belt is provided with a first guide portion, the lower belt is provided with a second guide portion, and the connecting belt is provided with a positioning portion;

[0017] The first support frame and the second support frame connected thereto have a first guide groove corresponding to the first guide portion, a second guide groove corresponding to the second guide portion, and a positioning groove corresponding to the positioning portion.

[0018] In some embodiments, the cutting assembly includes a cutting blade and a driven drive wheel fixedly connected to the cutting blade, wherein a rotating shaft is fixedly connected to the driven drive wheel;

[0019] The connecting assembly further includes a first bearing and a second bearing coaxially arranged with the first bearing. The first bearing is connected to the first support frame, and the second bearing is connected to the second support frame. The two ends of the rotating shaft are respectively installed in the first bearing and the second bearing. The cutting blade and the driven transmission wheel can rotate along the central axis of the second bearing.

[0020] In some embodiments, the drive assembly includes a connecting block, a sliding support frame, a slider, a drive motor, and a rotating wheel;

[0021] One end of the connecting block is connected to the upper belt, the drive belt, and the lower belt, and the other end of the connecting block is connected to the sliding support frame.

[0022] The sliding support frame is provided with a sliding groove, the slider is installed in the sliding groove and is movably connected to the sliding support frame, and the sliding support frame is also provided with a locking component for fixing the slider;

[0023] The drive motor is fixed on the slider;

[0024] The rotating wheel is driven by the drive motor.

[0025] In some embodiments, the rotating wheel is connected to the driven wheel via a transmission chain;

[0026] The tooth bases of both the rotating wheel and the driven transmission wheel are circular groove structures, and the transmission chain is a beaded chain structure.

[0027] The upper belt has a first through hole for the transmission chain to pass through, and the lower belt has a second through hole for the transmission chain to pass through.

[0028] In some embodiments, the height adjustment assembly includes a support shaft, a torsion spring, an adjustable leg, and a traction member;

[0029] The two ends of the support shaft are respectively connected to the lower part of the first support frame and the lower part of the second support frame;

[0030] The torsion spring is sleeved on the outer side of the support shaft, and the two ends of the torsion spring are respectively connected to the second support frame and the adjusting leg. The torsion spring is used to provide the adjusting leg with an elastic force to restore its initial state.

[0031] The adjustable support leg includes an integrally formed connecting part and a function part. The connecting part has a through hole for the support shaft to pass through. The connecting part is mounted on the support shaft through the through hole. The adjustable support leg is rotatably connected to the support shaft.

[0032] The first end of the traction member is connected to the connecting part. The lower belt body is provided with a third through hole for the traction member to pass through. The second end of the traction member is located on the side of the lower belt body facing the sliding support frame. When the traction member pulls the connecting part to rotate, the actuating part rotates with the connecting part and abuts against the tube bundle plate of the nuclear power steam generator.

[0033] In some embodiments, the inflating assembly includes an air bladder and an air tube;

[0034] The upper belt is provided with a receiving groove for the airbag to be installed, and the airbag is installed in the receiving groove;

[0035] The first end of the trachea is connected to the airbag. The upper belt has a fourth through hole for the trachea to pass through. The connecting block has a fifth through hole corresponding to the fourth through hole. The second end of the trachea passes through the fourth through hole and the fifth through hole and is connected to an external air source mechanism.

[0036] In some embodiments, the cutting device further includes a camera light source assembly, which includes a camera, a light source element, and cables;

[0037] The camera and the light source are both mounted on the side of the second support frame away from the cutting strip assembly. The cable is connected to the camera and the light source. The lower strip has a threading hole for the cable to pass through.

[0038] In this embodiment, a method for using a filamentous foreign object fixing and cutting device between tubes of a nuclear power steam generator is also constructed. This method, based on the aforementioned filamentous foreign object fixing and cutting device between tubes of a nuclear power steam generator, includes the following steps:

[0039] S1: The synchronous pulley drives the drive belt, allowing the nuclear power steam generator tube-to-tube filamentous fixed foreign object cutting device to enter the area of ​​the filamentous foreign object to be cut.

[0040] S2: Adjust the height adjustment component according to the height of the filamentous foreign object to ensure that the cutting blade is at the required cutting height;

[0041] S3: The airbag inflates and expands, thus fixing the filamentous foreign object cutting device between the tubes of the nuclear power steam generator inside the tube bundle of the nuclear power steam generator.

[0042] S4: Move the slider in the groove of the sliding support frame to put the transmission chain rotation circuit in a taut state, and then tighten the locking parts to fix the position of the slider;

[0043] S5: Start the drive motor, the cutting blade begins to rotate, and the cutting of the filamentous fixed foreign objects between the tubes of the nuclear power steam generator is completed.

[0044] The present invention has the following beneficial effects: The cutting device for filamentous fixed foreign objects between tubes of a nuclear power steam generator uses a chain drive drive assembly to drive the cutting assembly to cut the filamentous fixed foreign objects, thereby realizing the cutting function of the cutting device. At the same time, a height adjustment assembly is used to adjust the height of the connecting assembly within the tube bundle of the nuclear power steam generator to ensure that the height of the cutting assembly meets the cutting requirements. Furthermore, the expansion characteristics of the expansion assembly are utilized to fix the entire cutting device for filamentous fixed foreign objects between tubes of the nuclear power steam generator within the tube bundle after the expansion assembly expands, ensuring fixation during cutting and limiting the position of the cutting assembly, avoiding potential damage to the heat transfer tubes of the nuclear power steam generator. This cutting device for filamentous fixed foreign objects between tubes of a nuclear power steam generator improves the safety, convenience, and accessibility of the cutting operation. Attached Figure Description

[0045] To more clearly illustrate the technical solution of the present invention, the present invention will be further described below in conjunction with the accompanying drawings and embodiments. It should be understood that the following drawings only show some embodiments of the present invention and should not be considered as a limitation of the scope. For those skilled in the art, other related drawings can be obtained from these drawings without creative effort. In the drawings:

[0046] Figure 1 This is a schematic diagram of the overall structure of the filament-shaped foreign object fixing and cutting device between tubes of a nuclear power steam generator in some embodiments of the present invention;

[0047] Figure 2 yes Figure 1 Enlarged view of point A in the middle;

[0048] Figure 3 yes Figure 2 A structural diagram from another direction;

[0049] Figure 4 yes Figure 1 Enlarged view of point B in the middle;

[0050] Figure 5 yes Figure 4 A schematic diagram of the internal structure behind the hidden second support frame;

[0051] Figure 6 yes Figure 5 A structural diagram from another direction;

[0052] Figure 7 This is a structural schematic diagram of the first support frame;

[0053] Figure 8 This is a partial structural diagram of the cutting tape assembly;

[0054] Figure 9This is a structural diagram of the connecting components and the camera light source components. Detailed Implementation

[0055] To provide a clearer understanding of the technical features, objectives, and effects of this invention, specific embodiments are now described in detail with reference to the accompanying drawings. In the following description, it should be understood that the orientations or positional relationships indicated by terms such as "front," "rear," "upper," "lower," "left," "right," "longitudinal," "horizontal," "vertical," "horizontal," "top," "bottom," "inner," "outer," "head," and "tail" are based on the orientations or positional relationships shown in the accompanying drawings, and are constructed and operated in a specific orientation. They are only for the convenience of describing this technical solution and do not indicate that the device or element referred to must have a specific orientation; therefore, they should not be construed as limitations on this invention.

[0056] It should also be noted that, unless otherwise explicitly specified and limited, terms such as "installation," "connection," "linking," "fixing," and "setting" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. When an component is referred to as being "on" or "below" another component, the component can be located "directly" or "indirectly" on the other component, or there may be one or more intermediary components. The terms "first," "second," "third," etc., are only for the convenience of describing this technical solution and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Therefore, features defined with "first," "second," "third," etc., may explicitly or implicitly include one or more of that feature. For those skilled in the art, the specific meaning of the above terms in this invention can be understood according to the specific circumstances.

[0057] Please see Figures 1 to 9 This is a cutting device for fixing filamentous foreign objects between tubes in a nuclear power steam generator, as described in some embodiments of the present invention. It includes a cutting strip assembly 1, a driving assembly 2, a cutting assembly 3, a connecting assembly 4, a tightening assembly 5, and a height adjusting assembly 6. Figure 1As shown, the connecting assembly 4 is connected to one end of the cutting belt assembly 1. The cutting assembly 3 is mounted on the connecting assembly 4 and used to cut filamentous fixed foreign objects. The driving assembly 2 is connected to the end of the cutting belt assembly 1 away from the connecting assembly 4 and is drively connected to the cutting assembly 3, used to drive the cutting assembly 3 to move. The tensioning assembly 5 is connected to the cutting belt assembly 1. After expansion, the tensioning assembly 5 is fixed inside the tube bundle of the nuclear power steam generator. The expansion of the tensioning assembly 5 also fixes the entire filamentous fixed foreign object cutting device between the tubes of the nuclear power steam generator inside the tube bundle, ensuring fixation during cutting and limiting the cutting assembly 3, avoiding potential damage to the heat transfer tubes of the nuclear power steam generator. The height adjustment assembly 6 is mounted on the connecting assembly 4 and used to adjust the height of the connecting assembly 4 inside the tube bundle of the nuclear power steam generator to ensure that the height of the cutting assembly 3 meets the cutting requirements.

[0058] Specifically, such as Figure 2 and Figure 4 As shown, the cutting belt assembly 1 is the main body of the filament-like foreign object fixing cutting device between tubes of a nuclear power steam generator. The cutting belt assembly 1 includes an upper belt 11, a driving belt 12, a lower belt 13, and a connecting belt 14. The upper belt 11, driving belt 12, and lower belt 13 are connected sequentially from top to bottom. The connecting belt 14 is connected to the upper belt 11, driving belt 12, and lower belt 13, and is also connected to a connecting assembly 4. It is understood that the cutting belt assembly 1 adopts a modular design. The upper belt 11, driving belt 12, lower belt 13, and connecting belt 14 are all made of plastic, preferably polyurethane. The upper belt 11, driving belt 12, lower belt 13, and connecting belt 14 are connected to each other by riveting or sewing.

[0059] Meanwhile, the drive belt 12 is equipped with a synchronous belt tooth structure 121. During use, a magnetic wall-climbing robot (not shown in the figure) can be installed on the inner wall of the nuclear power steam generator. The wall-climbing robot can carry the foreign object cutting device and drive the cutting belt assembly through a synchronous wheel (not shown in the figure) set inside it. The synchronous wheel matches the synchronous belt tooth structure 121 and is engaged with the drive belt 12. The wall-climbing robot can drive the synchronous wheel to move, thereby moving the drive belt 12 and also moving the entire filament-like fixed foreign object cutting device between the nuclear power steam generator tubes, realizing the movement of the filament-like fixed foreign object cutting device between the nuclear power steam generator tubes between the nuclear power steam generator tube bundles.

[0060] Furthermore, the cutting belt assembly 1 is generally flat and elongated. In this embodiment, the thickness of the upper belt 11 and the lower belt 13 is 3mm, the length of the upper belt 11 and the lower belt 13 is 4000mm, and the distance from the upper end face of the upper belt 11 to the lower end face of the lower belt 13 is 28.5mm. This flat and elongated design facilitates the entry of the entire nuclear power steam generator inter-tube fine wire fixed foreign object cutting device into the narrow inter-tube space of the nuclear power steam generator.

[0061] like Figures 4 to 7 As shown, the connecting component 4 includes a first support frame 41 and a second support frame 42 connected to the first support frame 41. The first support frame 41 and the second support frame 42 are connected by a fixing pin 43. After the first support frame 41 and the second support frame 42 are connected, there is space for accommodating the cutting component 3 and the height adjustment component 6. Specifically, the upper belt 11 is provided with a first guide portion 111, the lower belt 13 is provided with a second guide portion 131, the connecting belt 14 is provided with a positioning portion 141, the first support frame 41 and the second support frame 42 are connected to each other and have a first guide groove 411 corresponding to the first guide portion 111, a second guide groove 412 corresponding to the second guide portion 131 and a positioning groove 413 corresponding to the positioning portion 141. The above-mentioned setting of the first guide portion 111, the second guide portion 131, the positioning portion 141, the first guide groove 411, the second guide groove 412 and the positioning groove 413 completes the positioning of the cutting belt assembly 1 to the connecting assembly 4, and strengthens the connection stability between the cutting belt assembly 1 and the connecting assembly 4.

[0062] like Figure 5 and Figure 6 As shown, the cutting assembly 3 includes a cutting blade 31 and a driven transmission wheel 32 fixedly connected to the cutting blade 31. A rotating shaft 33 is fixedly connected to the driven transmission wheel 32. The driven transmission wheel 32 can be welded to the cutting blade 31, or the cutting blade 31 can be welded to the driven transmission wheel 32. The specifications of the cutting blade 31 can be selected according to the fine filament-like fixed foreign object to be cut. It can be understood that the cutting blade 31 and the driven rotating wheel 25 are concentrically arranged, and the cutting blade 31 and the rotating shaft 33 are relatively fixedly arranged. The cutting blade 31, the driven rotating wheel 25, and the rotating shaft 33 can rotate synchronously around the central axis of the rotating shaft 33.

[0063] Meanwhile, the first support frame 41 and the second support frame 42, after being connected, have grooves for mounting the cutting blade 31 and the driven transmission wheel 32. The connecting assembly 4 also includes a first bearing 44 and a second bearing 45 coaxially arranged with the first bearing 44. The first bearing 44 is connected to the first support frame 41, and the second bearing 45 is connected to the second support frame 42. The two ends of the rotating shaft 33 are respectively installed in the first bearing 44 and the second bearing 45. The cutting blade 31 and the driven transmission wheel 32 can rotate along the central axis of the second bearing 45. The first bearing 44 and the second bearing 45 also complete the positioning of the rotating shaft 33, the cutting blade 31, and the driven transmission wheel 32.

[0064] like Figure 2 and Figure 3 As shown, the drive assembly 2 includes a connecting block 21, a sliding support frame 22, a slider 23, a drive motor 24, and a rotating wheel 25. One end of the connecting block 21 is connected to the upper belt 11, the drive belt 12, and the lower belt 13, while the other end is connected to the sliding support frame 22. The connecting block 21 can be connected to the upper belt 11, the drive belt 12, the lower belt 13, and the sliding support frame 22 by bolts. The sliding support frame 22 has a groove 221, which is arranged along the length of the sliding support frame 22. The slider 23 is installed in the groove 221 and is movably connected to the sliding support frame 22. By translating the slider 23, the tension of the transmission chain 27 can be adjusted.

[0065] Meanwhile, the sliding support frame 22 is also equipped with a locking member 26 for fixing the slider 23. After the position adjustment of the slider 23 is completed, the locking member 26 can be used to lock the slider 23 onto the slide groove 221 to prevent it from sliding along the sliding support frame 22. In addition, the drive motor 24 can be fixed to the slider 23 with bolts, and the rotating wheel 25 is driven by the drive motor 24. Specifically, the output shaft of the drive motor 24 can be connected to the rotating shaft of the rotating wheel 25 through a coupling, and the drive motor 24 can drive the rotating wheel 25 to rotate.

[0066] Combined Figure 8 As shown, the rotating wheel 25 is connected to the driven transmission wheel 32 via a transmission chain 27. The upper belt body 11 has a first through hole 112 for the transmission chain 27 to pass through, and the lower belt body 13 has a second through hole 132 for the transmission chain 27 to pass through, so that the movement path of the transmission chain 27 forms a rotation loop. It can be understood that the drive motor 24 drives the rotating wheel 25 to rotate, and at the same time drives the driven rotating wheel and the cutting blade 31 to rotate through the rotation loop of the transmission chain 27 in the cutting belt assembly 1, thereby achieving the cutting effect.

[0067] Preferably, the tooth roots of both the rotating wheel 25 and the driven transmission wheel 32 are circular groove structures, and the transmission chain 27 is a beaded chain structure. In use, the beads of the transmission chain 27 engage with the aforementioned circular groove structure, thereby pulling the transmission chain 27 and causing the driven rotating wheel 25 to rotate. This beaded chain structure of the transmission chain 27 is existing technology, and its appropriate specifications can be selected based on the actual application. In other embodiments, the transmission chain 27 can also be a common roller chain, as long as it can fulfill the corresponding transmission requirements.

[0068] like Figure 5 and Figure 6 As shown, the height adjustment assembly 6 includes a support shaft 61, a torsion spring 62, an adjusting leg 63, and a traction member 64. The two ends of the support shaft 61 are connected to the lower parts of the first support frame 41 and the second support frame 42, respectively. The torsion spring 62 is sleeved on the outer surface of the support shaft 61, and its two ends are connected to the second support frame 42 and the adjusting leg 63, respectively. The torsion spring 62 provides an elastic force to the adjusting leg 63 to return it to its initial state. Understandably, the torque or rotational force generated by the torsion spring 62 can provide a force to pull the adjusting leg 63 back to its initial position; the torsion spring 62 acts as a reset mechanism for the adjusting leg 63.

[0069] In addition, the adjustable support leg 63 includes an integrally formed connecting part 631 and an actuating part 632. The connecting part 631 has a through hole 6311 for the support shaft 61 to pass through. The connecting part 631 is mounted on the support shaft 61 through the through hole 6311. The adjustable support leg 63 is rotatably connected to the support shaft 61. The first end of the traction member 64 is connected to the connecting part 631. The lower belt body 13 has a third through hole 133 for the traction member 64 to pass through. The second end of the traction member 64 is located on the side of the lower belt body 13 facing the sliding support frame 22. When the traction member 64 pulls the connecting part 631 to rotate, the actuating part 632 rotates with the connecting part 631 and abuts against the tube bundle plate of the nuclear power steam generator.

[0070] In this embodiment, the adjustable support leg 63 has an overall L-shaped structure. The connecting part 631 and the function part 632 are arranged perpendicularly. The length of the connecting part 631 is smaller than the length of the function part 632. There is a certain space between the connecting part 631 and the second support frame 42 for the connecting part 631 to move. The function part 632 is located at the lower part of the second support frame 42. When the function part 632 rotates, it can protrude from the bottom surface of the second support frame 42. In its natural state, the connecting part 631 is vertical and parallel to the side of the second support frame 42, while the function part 632 is flush with the bottom surface of the second support frame 42. In actual operation, when the traction member 64 is pulled, the traction member 64 drives the adjusting leg 63 to rotate counterclockwise. At this time, the action part 632 extends out of the bottom end face of the second support frame 42 and abuts against the tube bundle plate of the nuclear power steam generator. When it reaches the appropriate position, the traction member 64 can be locked by a locking mechanism to fix the height position of the cutting blade 31. In general, the height adjustment component 6 can adjust the pulling degree of the traction member 64 according to the actual needs of the cutting operation to adjust the rotation angle of the adjusting leg 63, thereby adapting to the cutting of filamentous fixed foreign objects at different heights.

[0071] like Figure 4 and Figure 8 As shown, the tensioning assembly 5 includes an airbag 51 and an air tube 52. The upper belt body 11 is provided with a receiving groove 114 for installing the airbag 51. The airbag 51 is installed in the receiving groove 114. The first end of the air tube 52 is connected to the airbag 51. The upper belt body 11 is provided with a fourth through hole 115 through which the air tube 52 passes. Figure 3 As shown, the connecting block 21 has a fifth through hole 211 corresponding to the fourth through hole 115. The second end of the air pipe 52 passes through the fourth through hole 115 and the fifth through hole 211 and is connected to the external air source mechanism. It can be understood that the receiving groove 114 is specifically located on the side of the upper belt 11 near the connecting assembly 4. The external air source mechanism can deliver air to the air bag 51 through the air pipe 52. When the cutting blade 31 reaches the appropriate working position, before the cutting work begins, the air bag 51 is inflated and expands. After the air bag 51 expands, its two sides are tightly pressed against the tube bundle of the nuclear power steam generator, thereby fixing the entire filamentous foreign object fixing cutting device between the tubes of the nuclear power steam generator inside the tube bundle of the nuclear power steam generator. This ensures the fixation during cutting and the limiting of the cutting blade 31, and avoids the cutting blade 31 causing the entire cutting device to shake between the tubes under the action of cutting force, which could potentially damage the heat transfer tubes of the nuclear power steam generator.

[0072] For example Figure 9As shown, the filament-like foreign object fixing cutting device between tubes of the nuclear power steam generator also includes a camera light source assembly 7. The camera light source assembly 7 includes a camera 71, a light source 72, and a cable 73. The camera 71 and the light source 72 are both mounted on the side of the second support frame 42 away from the cutting belt assembly 1. The cable 73 connects the camera 71 and the light source 72. A threading hole 134 is provided on the lower belt 13 for the cable 73 to pass through. Understandably, the camera 71 can be used to acquire real-time images during the on-site cutting operation, allowing workers to understand the on-site cutting status based on the acquired real-time images, and also enabling workers to adjust the height adjustment assembly 6 based on the acquired real-time images. The light source 72 provides light to the on-site cutting environment. After passing through the threading hole 134, the cable 73 exits at the end of the lower belt 13 away from the connecting assembly and connects to an external transmission device. The cable 73 provides signal transmission and power to the camera 71 and the light source 72.

[0073] In this embodiment, a method for using a filamentous foreign object fixing and cutting device between tubes of a nuclear power steam generator is also constructed. This method is based on the aforementioned filamentous foreign object fixing and cutting device between tubes of a nuclear power steam generator, and includes the following steps:

[0074] S1: The synchronous pulley drives the drive belt 12, so that the nuclear power steam generator tube-to-tube filamentous fixed foreign object cutting device enters the area of ​​the filamentous foreign object to be cut.

[0075] S2: Adjust the height adjustment component 6 according to the height of the filamentous foreign object to ensure that the height of the cutting disc 31 meets the cutting requirements;

[0076] S3: The airbag 51 inflates and fixes the filamentous foreign object cutting device between the tubes of the nuclear power steam generator inside the tube bundle of the nuclear power steam generator.

[0077] S4: Move the slider 23 in the groove 221 of the sliding support frame 22 to put the rotation loop of the transmission chain 27 in a taut state, and then tighten the locking piece 26 to fix the position of the slider 23.

[0078] S5: Start the drive motor 24, and the cutting blade 31 begins to rotate, completing the cutting of the filamentous fixed foreign objects between the tubes of the nuclear power steam generator.

[0079] The working principle of the thin wire-shaped foreign object fixing and cutting device between the tubes of the nuclear power steam generator has been described in detail above, and will not be repeated here.

[0080] In summary, this cutting device for filamentous fixed foreign objects between nuclear power steam generator tubes utilizes the drive assembly 2 to drive the cutting assembly 3 to cut filamentous fixed foreign objects, thereby realizing the cutting function of the cutting device. Simultaneously, the height adjustment assembly 6 is used to adjust the height of the connecting assembly 4 within the tube bundle of the nuclear power steam generator, ensuring that the height of the cutting assembly 3 meets the cutting requirements. Furthermore, the expansion characteristics of the tensioning assembly 5 are utilized to fix the entire cutting device within the tube bundle of the nuclear power steam generator after expansion, ensuring fixation during cutting and limiting the position of the cutting assembly 3, avoiding potential damage to the heat transfer tubes of the nuclear power steam generator. The cutting belt assembly 1 is engaged and driven by the synchronous belt toothed structure 121, ensuring the propulsion force for the cutting belt assembly 1 to travel between the tube bundles of the nuclear power steam generator. This cutting device for filamentous fixed foreign objects between nuclear power steam generator tubes improves the safety, convenience, and accessibility of the cutting operation process.

[0081] It is understood that the above embodiments only illustrate preferred embodiments of the present invention, and their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of the present invention. It should be noted that those skilled in the art can freely combine the above technical features without departing from the concept of the present invention, and can also make several modifications and improvements, all of which fall within the protection scope of the present invention. Therefore, all equivalent transformations and modifications made with respect to the scope of the claims of the present invention should fall within the scope of the claims of the present invention.

Claims

1. A nuclear power steam generator inter-tube filamentary foreign object cutting device, characterized by, It includes a cutting belt assembly (1), a drive assembly (2), a cutting assembly (3), a connecting assembly (4), a tensioning assembly (5), and a height adjustment assembly (6); The connecting component (4) is connected to one end of the cutting strip assembly (1), and the cutting component (3) is installed on the connecting component (4) and used to cut the filamentous fixed foreign object; The drive component (2) is connected to the end of the cutting strip assembly (1) away from the connecting component (4) and is connected to the cutting assembly (3) in a transmission manner. The drive component (2) is used to drive the cutting assembly (3) to move. The expansion assembly (5) is connected to the cutting strip assembly (1), and after the expansion assembly (5) expands, it is fixed inside the tube bundle of the nuclear power steam generator; The height adjustment component (6) is mounted on the connecting component (4) and is used to adjust the height of the connecting component (4) within the tube bundle of the nuclear power steam generator; The cutting belt assembly (1) includes an upper belt (11), a driving belt (12), a lower belt (13), and a connecting belt (14). The upper belt (11), the driving belt (12), and the lower belt (13) are connected sequentially from top to bottom; The connecting band (14) is connected to the upper band (11), the driving band (12) and the lower band (13), and the connecting band (14) is also connected to the connecting assembly (4). The drive belt (12) is provided with a synchronous belt tooth structure (121). The connecting component (4) includes a first support frame (41) and a second support frame (42). The upper belt (11) is provided with a first guide part (111), the lower belt (13) is provided with a second guide part (131), and the connecting belt (14) is provided with a positioning part (141). The first support frame (41) and the second support frame (42) connected thereto have a first guide groove (411) corresponding to the first guide part (111), a second guide groove (412) corresponding to the second guide part (131), and a positioning groove (413) corresponding to the positioning part (141).

2. The nuclear power steam generator inter-tube filamentary foreign object cutting device of claim 1, wherein, The upper belt (11), the driving belt (12), the lower belt (13), and the connecting belt (14) are all made of plastic. The upper belt (11), the driving belt (12), the lower belt (13), and the connecting belt (14) are connected to each other by riveting, sewing, or hot pressing.

3. The filament-shaped foreign object fixing and cutting device between tubes of a nuclear power steam generator according to claim 2, characterized in that, The first support frame (41) and the second support frame (42) are connected by a fixing pin (43).

4. The filament-shaped foreign object fixing and cutting device between tubes of a nuclear power steam generator according to claim 3, characterized in that, The cutting assembly (3) includes a cutting blade (31) and a driven transmission wheel (32) fixedly connected to the cutting blade (31), and a rotating shaft (33) is fixedly connected to the driven transmission wheel (32). The connecting assembly (4) further includes a first bearing (44) and a second bearing (45) coaxially arranged with the first bearing (44). The first bearing (44) is connected to the first support frame (41), and the second bearing (45) is connected to the second support frame (42). The two ends of the rotating shaft (33) are respectively installed in the first bearing (44) and the second bearing (45). The cutting blade (31) and the driven transmission wheel (32) can rotate along the central axis of the second bearing (45).

5. The filament-shaped foreign object fixing and cutting device between tubes of a nuclear power steam generator according to claim 4, characterized in that, The drive assembly (2) includes a connecting block (21), a sliding support frame (22), a slider (23), a drive motor (24), and a rotating wheel (25); One end of the connecting block (21) is connected to the upper belt (11), the driving belt (12) and the lower belt (13), and the other end of the connecting block (21) is connected to the sliding support frame (22). The sliding support frame (22) is provided with a sliding groove (221), the slider (23) is installed in the sliding groove (221) and is movably connected to the sliding support frame (22), and the sliding support frame (22) is also provided with a locking member (26) for fixing the slider (23). The drive motor (24) is fixed on the slider (23); The rotating wheel (25) is driven by the drive motor (24).

6. The filament-shaped foreign object fixing and cutting device between tubes of a nuclear power steam generator according to claim 5, characterized in that, The rotating wheel (25) is connected to the driven wheel (32) via a transmission chain (27); The tooth base of the rotating wheel (25) and the tooth base of the driven transmission wheel (32) are both circular groove structures, and the transmission chain (27) is a beaded chain structure; The upper belt (11) is provided with a first through hole (112) for the transmission chain (27) to pass through, and the lower belt (13) is provided with a second through hole (132) for the transmission chain (27) to pass through.

7. The filament-shaped foreign object fixing and cutting device between tubes of a nuclear power steam generator according to claim 6, characterized in that, The height adjustment assembly (6) includes a support shaft (61), a torsion spring (62), an adjustable outrigger (63), and a traction member (64). The two ends of the support shaft (61) are respectively connected to the lower part of the first support frame (41) and the lower part of the second support frame (42); The torsion spring (62) is sleeved on the outer side of the support shaft (61), and the two ends of the torsion spring (62) are respectively connected to the second support frame (42) and the adjusting leg (63). Used to provide an elastic force for the adjustable outrigger (63) to restore its initial state; The adjustable support leg (63) includes an integrally formed connecting part (631) and an actuating part (632). The connecting part (631) has a through hole (6311) for the support shaft (61) to pass through. The connecting part (631) is mounted on the support shaft (61) through the through hole (6311). The adjustable support leg (63) is rotatably connected to the support shaft (61). The first end of the traction member (64) is connected to the connecting part (631). The lower belt body (13) is provided with a third through hole (133) through which the traction member (64) passes. The second end of the traction member (64) is located on the side of the lower belt body (13) facing the sliding support frame (22). When the traction member (64) pulls the connecting part (631) to rotate, the actuating part (632) rotates with the connecting part (631) and abuts against the tube bundle plate of the nuclear power steam generator.

8. The filament-shaped foreign object fixing and cutting device between tubes of a nuclear power steam generator according to claim 7, characterized in that, The inflatable assembly (5) includes an airbag (51) and an air tube (52); The upper belt (11) is provided with a receiving groove (114) for the airbag (51) to be installed, and the airbag (51) is installed in the receiving groove (114); The first end of the trachea (52) is connected to the airbag (51). The upper belt (11) has a fourth through hole (115) for the trachea (52) to pass through. The connecting block (21) has a fifth through hole (211) corresponding to the fourth through hole (115). The second end of the trachea (52) passes through the fourth through hole (115) and the fifth through hole (211) and is connected to an external air source mechanism.

9. The filament-shaped foreign object fixing and cutting device between tubes of a nuclear power steam generator according to claim 3, characterized in that, The cutting device also includes a camera light source assembly (7), which includes a camera (71), a light source (72), and a cable (73). The camera (71) and the light source (72) are both mounted on the side of the second support frame (42) away from the cutting strip assembly (1). The cable (73) is connected to the camera (71) and the light source (72). The lower strip body (13) has a threading hole (134) for the cable (73) to pass through.

10. A method of using a filament-like foreign object fixing and cutting device between tubes of a nuclear power steam generator, based on the filament-like foreign object fixing and cutting device between tubes of a nuclear power steam generator as described in claim 8, characterized in that... Including the following steps: S1: Using the synchronous pulley to drive the drive belt (12), the nuclear power steam generator tube-to-tube filamentous fixed foreign object cutting device enters the area of ​​the filamentous foreign object to be cut. S2: Adjust the height adjustment component (6) according to the height of the filamentous foreign object to ensure that the height of the cutting blade (31) meets the cutting requirements; S3: The airbag (51) is inflated and expanded, so that the entire nuclear power steam generator tube-to-tube foreign object cutting device is fixed in the tube bundle of the nuclear power steam generator; S4: Move the slider (23) in the groove (221) of the sliding support frame (22) to make the rotation loop of the transmission chain (27) taut, and then tighten the locking piece (26) to fix the position of the slider (23); S5: Start the drive motor (24), and the cutting blade (31) begins to rotate, completing the cutting of the filamentous fixed foreign objects between the tubes of the nuclear power steam generator.

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