Detection device for heat transfer tube of steam generator

Abstract

The invention discloses a detection device for a heat transfer tube of a steam generator. The detection device comprises a driving assembly, a transmission part, a detection probe and a supporting assembly which is detachably mounted on an inlet and an outlet of the heat transfer tube, the driving assembly is installed on the supporting assembly and connected with the transmission part. The front end of the transmission part is connected with the detection probe, and the relative positions of the transmission part and the detection probe are kept; the detection probe extends into the heat transfer pipe, and the driving assembly is always located outside the heat transfer pipe. The driving assembly located outside the heat transfer tube is not limited by the diameter of the heat transfer tube any more, and a motor with a larger size and model can be adopted to drive the transmission part to drive the detection probe to move and rotate in the heat transfer tube for detection. Compared with the prior art, a general motor model can be selected, the motor is convenient to manufacture, the manufacturing cost is lower, sufficient power and rotating speed can be provided for a detection probe connected with a transmission part, the detection efficiency is improved, the detection cost is saved, the service life is prolonged, and the safety is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of nuclear power detection, and in particular to a detection device for a heat transfer tube of a steam generator. Background Art

[0002] Steam generator heat transfer tubes are a critical piece of equipment in nuclear power plants, and their safety is directly linked to the plant's overall performance. Over extended operation, scaling, commonly known as "sludge," can form on the secondary side of the steam generator. This can cause intergranular corrosion and stress corrosion cracking in the expansion transition section of the heat transfer tubes, reducing the evaporator's heat transfer efficiency and impacting unit output. Eddy current testing is one of the primary nondestructive testing techniques for detecting these defects and is well-suited for steam generator heat transfer tube inspection.

[0003] Currently, eddy current testing of the expanded tube area of ​​evaporator heat transfer tubes is typically performed using a rotating probe. This type of probe places extremely high demands on the motor's driver's conductive brush, which must provide high-speed rotational power and transmit microcurrent signals during testing. The existing motor, along with the rotating probe, enters the heat transfer tube for eddy current testing. Due to the small inner diameter of the heat transfer tube, the motor must be smaller than the tube's inner diameter. The selected small motor, due to its power and other factors, struggles to meet the power and speed requirements of the rotational testing. Furthermore, the small size and limited space of the required small motor place extremely high precision demands on its machining, making it difficult to manufacture. Furthermore, since the small motor must be located within the heat transfer tube, its heat dissipation performance is poor, making it susceptible to damage, shortening its service life and increasing testing costs. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to provide a detection device for a steam generator heat transfer tube.

[0005] The technical solution adopted by the present invention to solve its technical problem is: constructing a detection device for a steam generator heat transfer tube, comprising: a drive assembly, a transmission member, a detection probe and a support assembly for detachably mounting on the inlet and outlet of the heat transfer tube; the drive assembly is mounted on the support assembly and connected to the transmission member; the front end of the transmission member is connected to the detection probe and maintains their relative position; the detection probe extends into the heat transfer tube, and the drive assembly is always located outside the heat transfer tube; the drive assembly drives the detection probe through the transmission member to rotate in the heat transfer tube and move along the heat transfer tube.

[0006] Furthermore, at least a portion of the detection probe is in abutment with, or slidably connected to, or clearance-fitted with the inner wall of the heat transfer tube.

[0007] Furthermore, the driving assembly includes: a transmission sleeve and a power source, the transmission sleeve is rotatably connected to the support assembly; the power source is installed on the support assembly to drive the transmission sleeve to rotate, and the transmission member and the transmission sleeve are radially limited to drive the transmission member to rotate.

[0008] Furthermore, the detection probe includes: a detection module and a carrier, multiple detection modules are arranged on the outer wall of the carrier, the carrier is installed on the transmission member, and the power source drives the transmission member to reciprocate along its axis through the transmission sleeve, and the reciprocating rotation angle range is 30°-120°; so that multiple detection modules can be displaced and reciprocatingly rotated in the heat transfer tube for detection.

[0009] Furthermore, the detection probe further includes a support member installed at the front end and / or the rear end of the bearing member, the diameter of the support member is larger than the diameter of the bearing member, and the support member contacts the inner wall of the heat transfer tube.

[0010] Furthermore, the transmission member includes: a connecting block and a pulling member, the connecting block is mounted on the pulling member and is detachably connected to the detection probe; the pulling member and the transmission sleeve are radially limited to each other.

[0011] Furthermore, the detection device for the heat transfer tube of the steam generator also includes a pushing and pulling mechanism, the pulling piece is flexible, and the pulling piece located outside the heat transfer tube is wound around the pushing and pulling mechanism.

[0012] Furthermore, the support assembly includes: a support frame and a plurality of locking members, and the support frame is detachably mounted on the inlet and outlet of the heat transfer tube via the plurality of locking members.

[0013] Furthermore, the locking member includes: a tensioning block and a driving rod, the tensioning block is slidably connected to the support frame, the driving rod is rotatably connected to the support frame, and is installed on the support frame through a threaded pair, driving the tensioning block away from or close to the center of the heat transfer tube, so that multiple tensioning blocks cooperate with each other to tighten or clamp the support frame on the heat transfer tube.

[0014] Furthermore, the detection device for the steam generator heat transfer tube also includes a guide member, which is installed on the support assembly. The guide member is provided with a through hole, so that the pushing and pulling mechanism can smoothly transport the transmission member to the transmission sleeve.

[0015] The implementation of the present invention has the following beneficial effects:

[0016] The present application comprises a support assembly detachably mounted on the inlet and outlet of a heat transfer tube, a drive assembly mounted on the support assembly, and connected to a transmission member. The front end of the transmission member is connected to a detection probe and maintains their relative position. The drive assembly is mounted on the outside of the heat transfer tube using the support assembly. The drive assembly is then driven by the transmission member to rotate the detection probe in the heat transfer tube while moving along the heat transfer tube, so that the detection probe at the front end of the transmission member scans and detects the interior of the heat transfer tube. The drive assembly located outside the heat transfer tube is no longer limited by the diameter of the heat transfer tube. A larger motor can be used to drive the transmission member to drive the detection probe to move and rotate in the heat transfer tube for detection. This allows the use of a more common motor model, which is easy to manufacture and has a lower cost. It can also provide sufficient power and speed for the detection probe connected to the transmission member, thereby improving detection efficiency, saving detection costs, extending service life, and improving safety. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solution of the present invention, the present invention will be further described below with reference to the accompanying drawings and embodiments. It should be understood that the following drawings only illustrate certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without paying any creative work.

[0018] In the attached figure:

[0019] Figure 1 is a schematic diagram of the three-dimensional structure of a detection device for a steam generator heat transfer tube in some embodiments of the present invention;

[0020] Figure 2 It is a schematic diagram of the three-dimensional structure of the driving assembly and the supporting assembly in the present invention;

[0021] Figure 3 This is a schematic diagram of the installation positions of the pulling member and the detection probe in the heat transfer tube of the present invention;

[0022] Figure 4 It is a schematic diagram of the three-dimensional structure of the support frame and the locking member in the present invention;

[0023] Figure 5 It is a schematic diagram of the three-dimensional structure of the detection probe and the connecting block in the present invention;

[0024] Figure 6 It is a schematic diagram of the installation position of the support assembly in the present invention installed on the heat transfer tube.

[0025] Description of the marks in the figure

[0026] Driving assembly 1, transmission sleeve 11, power source 12, support assembly 2, support frame 21, locking member 22, tensioning block 221, driving rod 222, transmission member 3, connecting block 31, pulling member 32, detection probe 4, detection module 41, bearing member 42, support member 43, heat transfer tube 5, guide member 6. DETAILED DESCRIPTION

[0027] In order to have a clearer understanding of the technical features, purposes and effects of the present invention, the specific embodiments of the present invention are now described in detail with reference to the accompanying drawings. In the following description, it should be understood that the directions or positional relationships indicated by "front", "back", "up", "down", "left", "right", "longitudinal", "horizontal", "vertical", "horizontal", "top", "bottom", "inside", "outside", "head", "tail", etc. are based on the directions or positional relationships shown in the accompanying drawings and are constructed and operated in specific directions. They are only for the convenience of describing the technical solution and do not indicate that the devices or components referred to must have specific directions. Therefore, they should not be understood as limiting the present invention.

[0028] It should also be noted that, unless otherwise clearly specified and limited, terms such as "installed", "connected", "connected", "fixed", and "set" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integrated connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the internal connection of two elements or the interaction relationship between two elements. When an element is referred to as being "on" or "under" another element, the element can be "directly" or "indirectly" located on the other element, or there may be one or more intervening elements. The terms "first", "second", "third", etc. are only for the convenience of describing the present technical solution, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first", "second", "third", etc. may explicitly or implicitly include one or more of such features. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to the specific circumstances.

[0029] In the following description, specific details such as particular system structures and techniques are provided for purposes of illustration, not limitation, to facilitate a thorough understanding of the embodiments of the present invention. However, it will be apparent to those skilled in the art that the present invention may be practiced in other embodiments without these specific details. In other cases, detailed descriptions of well-known systems, devices, circuits, and methods are omitted so as not to obscure the description of the present invention with unnecessary detail.

[0030] See also Figures 1 to 3A first embodiment of the present invention discloses a device for inspecting heat transfer tubes in a steam generator, comprising a drive assembly 1, a transmission member 3, a detection probe 4, and a support assembly 2 for removable installation at the inlet and outlet of a heat transfer tube 5. The drive assembly 1 is mounted on the support assembly 2 and connected to the transmission member 3. The front end of the transmission member 3 is connected to the detection probe 4, maintaining their relative position. The detection probe 4 extends into the heat transfer tube 5, while the drive assembly 1 remains located outside the heat transfer tube 5. The drive assembly 1, driven by the transmission member 3, causes the detection probe 4 to rotate within the heat transfer tube 5 and move along the heat transfer tube 5.

[0031] The present application is provided with a support assembly 2 detachably mounted on the inlet and outlet of the heat transfer tube 5, and a drive assembly 1 mounted on the support assembly 2 and connected to the transmission member 3. The front end of the transmission member 3 is connected to the detection probe 4 and maintains their relative positions. The drive assembly 1 is mounted on the outside of the heat transfer tube 5 using the support assembly 2, and then the drive assembly 1 is used to drive the detection probe 4 through the transmission member 3 to rotate in the heat transfer tube 5 while moving along the heat transfer tube 5, so that the detection probe 4 at the front end of the transmission member 3 scans and detects the inside of the heat transfer tube 5. The drive assembly 1 located outside the heat transfer tube 5 is no longer limited by the diameter of the heat transfer tube 5, and a larger size motor can be used to drive the transmission member 3 to drive the detection probe 4 to move and rotate in the heat transfer tube 5 for scanning and detection. Therefore, a more universal motor model can be selected. Such a motor is easy to manufacture and has a lower cost. It can also provide sufficient power and speed for the detection probe 4 connected to the transmission part 3, thereby improving the efficiency of detection and saving the cost of detection. Since the entire drive component 1 is located outside the heat transfer tube 5, the motor in the drive component 1 can have better heat dissipation space. A motor with a cooling fan can also be selected to further improve the heat dissipation effect of the motor, thereby extending the service life and improving safety.

[0032] Among them, the support component 2 can be an installation platform, which is then installed at the inlet and outlet positions of the heat transfer tube 5 by bolts, and then the drive component 1 is installed on the installation platform. Then, the drive component 1 is used to drive the detection probe 4 through the transmission part 3 to perform scanning and detection in the heat transfer tube 5, so that the size of the motor is no longer restricted, the detection efficiency is improved, and the detection cost is saved.

[0033] See also Figures 1 to 3 In some embodiments, the detection probe 4 is at least partially in contact with or in sliding connection with or in clearance fit with the inner wall of the heat transfer tube 5 .

[0034] In the present application, at least a portion of the detection probe 4 is in contact with, or is in sliding connection with, or is in clearance fit with, the inner wall of the heat transfer tube 5. When the detection probe 4 is in contact with the inner wall of the heat transfer tube 5, the diameter of the detection probe 4 is made smaller than the inner diameter of the heat transfer tube 5, thereby causing at least a portion of the detection probe 4 to contact the inner wall of the heat transfer tube 5, thereby reducing the resistance of the detection probe 4 and facilitating its movement within the heat transfer tube 5.

[0035] When the detection probe 4 is slidably connected inside the heat transfer tube 5, the diameter of the detection probe 4 can be the same as the inner diameter of the heat transfer tube 5, which can reduce the detection blind spot of the detection probe 4, improve the detection efficiency and accuracy, and reduce the shaking of the detection probe 4 in the heat transfer tube 5, thereby playing a certain protective role for the detection probe 4 and extending its service life.

[0036] When the detection probe 4 is fitted in the heat transfer tube 5 , the detection probe 4 can be suspended inside the heat transfer tube 5 by the support wheel, thereby reducing the wear between the detection probe 4 and the heat transfer tube 5 and further extending the service life.

[0037] See also Figure 2 、 Figure 4 and Figure 5 In some embodiments, the driving assembly 1 includes: a transmission sleeve 11 and a power source 12, the transmission sleeve 11 is rotatably connected to the support assembly 2; the power source 12 is installed on the support assembly 2 to drive the transmission sleeve 11 to rotate, and the transmission member 3 and the transmission sleeve 11 are radially limited to drive the transmission member 3 to rotate.

[0038] In the present application, a power source 12 is installed on the support assembly 2 to drive the transmission sleeve 11 to rotate, and the transmission member 3 is driven to rotate by radial limitation between the transmission member 3 and the transmission sleeve 11. The radial limitation between the transmission member 3 and the transmission sleeve 11 is a concave-convex matching structure. By providing a plurality of grooves or protrusions on the transmission member 3, and then providing protrusions or grooves that match the grooves or protrusions on the transmission sleeve 11, the transmission sleeve 11 can drive the transmission member 3 to rotate together when it rotates. The transmission member 3 can also slide axially on the transmission sleeve 11 while rotating, so that the transmission member 3 drives the detection probe 4 to move along the heat transfer tube 5 in the heat transfer tube 5 while performing rotation detection, thereby improving the detection efficiency, avoiding the limitation of the motor size, and saving the detection cost.

[0039] Among them, the power source 12 can drive the transmission sleeve 11 to rotate through a belt, chain or gear set. When the power source 12 drives the transmission sleeve 11 to rotate through the belt, it can cause slippage when the detection probe 4 encounters resistance, thereby protecting the detection probe 4.

[0040] When the power source 12 drives the transmission sleeve 11 to rotate through the chain, it can provide stable power drive for the detection probe 4 through the transmission sleeve 11, avoiding omission of detection inside the heat transfer tube 5, improving the accuracy of detection, and can also transmit power to the transmission sleeve 11 over a long distance, which is suitable for more usage environments.

[0041] When the power source 12 drives the transmission sleeve 11 to rotate through the gear set, the transmission sleeve 11 can provide stable power drive for the detection probe 4, thereby improving the stability and accuracy of the detection process.

[0042] Therefore, different types of power transmission can be selected according to the on-site usage, which expands the scope of use and makes it more diverse and diversified.

[0043] See also Figures 2 to 5 In some embodiments, the detection probe 4 includes a detection module 41 and a carrier 42. Multiple detection modules 41 are disposed on the outer surface of the carrier 42, which is mounted on the transmission member 3. The power source 12 drives the transmission member 3 to reciprocate along its axis via the transmission sleeve 11. The reciprocating rotation angle ranges from 30° to 120°. This allows the multiple detection modules 41 to perform reciprocating rotation detection while displacing within the heat transfer tube 5.

[0044] The present application arranges multiple detection modules 41 on the outer wall of the support member 42. When the support member 42 rotates, the multiple detection modules 41 rotate with the support member 42, thereby detecting the interior of the heat transfer tube 5 through the multiple detection modules 41. The multiple detection modules 41 can be arranged circumferentially on the outer wall of the support member 42, expanding the circumferential range of detection during each rotation, improving detection efficiency, reducing power output, and saving energy. The multiple detection modules 41 can also be arranged on the outer wall of the support member 42 along the axial direction of the heat transfer tube 5, thereby expanding the detection range in the axial direction, reducing the travel distance of the detection probe 4, further saving energy, and improving the accuracy of detection by comparing the detection data of each different detection module 41.

[0045] In this application, a bearing member 42 is mounted on the transmission member 3. The power source 12 drives the transmission member 3 to rotate back and forth along its axis through the transmission sleeve 11. The reciprocating rotation angle range is 30°-120°, allowing multiple detection modules 41 to move and rotate back and forth within the heat transfer tube 5 while performing reciprocating detection. By driving the transmission sleeve 11 to rotate back and forth with the power source 12, the combined scanning angle of the multiple detection modules 41 is 360°. The interior of the heat transfer tube 5 is inspected through the cooperation of multiple detection modules 41, thereby improving detection efficiency.

[0046] By setting the reciprocating rotation angle range to 30°-120°, the strength of the transmission member 3 can be prevented from being affected by an excessive rotation angle, thereby extending the service life of the transmission member 3. When the transmission sleeve 11 drives the detection probe 4 to reciprocate 30° through the transmission member 3, only 12 detection modules 41 need to be installed on the bearing member 42, so that the inside of the heat transfer tube 5 can be inspected 360° during rotation. It can also reduce the torque on the transmission member 3, improve safety and extend the service life of the transmission member 3.

[0047] When the transmission sleeve 11 drives the detection probe 4 to rotate back and forth 120° through the transmission member 3, only three detection modules 41 need to be installed on the carrier 42 to perform 360° detection on the inside of the heat transfer tube 5 during rotation, which saves the number of detection modules 41 carried, saves the cost of detection, and improves the accuracy of detection.

[0048] See also Figure 1 、 Figure 2 、 Figure 3 and Figure 5 In some embodiments, the detection probe 4 further includes a support member 43 installed at the front end or / and rear end of the carrier 42 . The diameter of the support member 43 is larger than the diameter of the carrier 42 and contacts the inner wall of the heat transfer tube 5 .

[0049] The present application is provided with a support member 43 installed at the front end or / and rear end of the support member 42. The diameter of the support member 43 is larger than the diameter of the support member 42 and is in contact with the inner wall of the heat transfer tube 5. The support member 43 can be a support wheel, a support rod, a support plate, or a petal-shaped elastic member. The support member 43 supports the support member 42 inside the heat transfer tube 5, thereby avoiding the wear and tear caused by the contact between the support member 42 and the detection module 41 and the inside of the heat transfer tube 5, thereby extending the service life. When the support member 43 is a petal-shaped elastic member, it will disperse a certain impact force when contacting the inner wall of the heat transfer tube 5. When the support member 43 moves and rotates back and forth following the support member 43, the wear on the inner wall of the heat transfer tube 5 is reduced, the service life of itself and the heat transfer tube 5 is extended, and the safety is improved.

[0050] When the support member 43 is disposed at the front or rear end of the carrier 42, the manufacturing cost of the support member 43 is reduced, thereby reducing the cost of detection. When the support member 43 is disposed at the front or rear end of the carrier 42, it can stably support the detection module 41 located in the middle of the carrier 42, thereby improving the stability of the detection probe 4 during operation, and the smoothness and accuracy of detection.

[0051] See also Figure 2 and Figure 5In some embodiments, the transmission member 3 includes: a connecting block 31 and a pulling member 32, the connecting block 31 is installed on the pulling member 32, and is detachably connected to the detection probe 4; the pulling member 32 and the transmission sleeve 11 are radially limited to each other.

[0052] In this application, the connecting block 31 is mounted on the pull member 32 and detachably connected to the detection probe 4. The pull member 32 and the transmission sleeve 11 are radially restrained. The connecting block 31 can be mounted on the support member 42 via a threaded assembly, simplifying operation and facilitating assembly and disassembly. If the detection probe 4 is damaged, it can be replaced promptly, improving detection efficiency. The connecting block 31 can also be mounted on the support member 42 using a latch to lock it, further improving replacement efficiency.

[0053] The pulling member 32 and the connecting block 31 are fixedly connected, so that the pulling member 32 can drive the bearing member 42 to rotate and move together through the connecting block 31, thereby improving the detection efficiency.

[0054] See also Figures 1 to 5 In some embodiments, the detection device for the heat transfer tube of the steam generator further includes a pushing and pulling mechanism, the pulling member 32 is flexible, and the pulling member 32 located outside the heat transfer tube 5 is wound around the pushing and pulling mechanism.

[0055] The present application uses a flexible pulling member 32, which is located outside the heat transfer tube 5 and is wound around a pushing mechanism. The pushing mechanism is a relatively mature existing device, in which a motor drives a winding wheel to rotate, winding the pulling member 32 around the winding wheel. Then, the motor is started, and the motor drives the winding wheel to rotate counterclockwise. The pulling member 32 released from the rear is used to push the pulling member 32 that has entered the heat transfer tube 5 forward, so that the pulling member 32 drives the supporting member 42 to move forward and backward through the connecting block 31. This is suitable for long-distance detection of the heat transfer tube 5. By winding the pulling member 32 around the pushing mechanism, the space occupied by the entire detection device can be saved, the detection process is more automated, labor intensity is reduced, and the efficiency and accuracy of the detection are improved.

[0056] Among them, since the transmission sleeve 11 drives the passing pulling member 32 to rotate back and forth, after the pulling member 32 rotates counterclockwise to a suitable angle, the transmission sleeve 11 will drive the pulling member 32 to rotate clockwise to the initial angle, and then the pulling member 32 wrapped on the pushing and pulling mechanism will be reset after a certain twisting occurs, which will not affect the pushing and pulling mechanism driving the pulling member 32 to move axially, reducing damage to the pulling member 32, extending its service life, and being suitable for longer distance detection.

[0057] See also Figures 4 to 6In some embodiments, the support assembly 2 includes: a support frame 21 and a plurality of locking members 22 , and the support frame 21 is detachably mounted on the inlet and outlet of the heat transfer tube 5 through the plurality of locking members 22 .

[0058] The present application utilizes a support frame 21 that is detachably mounted on the inlet and outlet of the heat transfer tube 5 via multiple locking members 22, wherein the multiple locking members 22 can be bolts or pins. The support frame 21 is secured to the inlet and outlet of the heat transfer tube 5 by the interaction of the multiple locking members 22. This design facilitates operation, low manufacturing cost, and ease of processing and installation. The support frame 21 is used to support the drive assembly 1, freeing the power source 12 from being limited by the diameter of the heat transfer tube 5. This design provides sufficient power for the detection probe 4, reduces detection costs, and extends its service life.

[0059] See also Figures 4 to 6 In some embodiments, the locking member 22 includes: a tensioning block 221 and a driving rod 222. The tensioning block 221 is slidably connected to the support frame 21, and the driving rod 222 is rotatably connected to the support frame 21. The driving rod 222 is installed on the support frame 21 through a threaded pair, driving the tensioning block 221 away from or close to the center of the heat transfer tube 5, so that the multiple tensioning blocks 221 cooperate with each other to tighten or clamp the support frame 21 on the heat transfer tube 5.

[0060] In this application, the drive rod 222 drives the tensioning block 221 away from or toward the center of the heat transfer tube 5, so that the multiple tensioning blocks 221 cooperate with each other to tighten or clamp the support frame 21 on the heat transfer tube 5. During installation, different installation methods can be adopted according to the inlet and outlet conditions of the heat transfer tube 5 on site. When a longer heat transfer tube 5 inlet and outlet is leaking, the drive rod 222 can be rotated to drive the tensioning block 221 toward the center of the heat transfer tube 5, so that the surrounding tensioning blocks 221 clamp against the outer wall of the heat transfer tube 5 inlet and outlet, preventing the tensioning blocks 221 from blocking the heat transfer tube 5 inlet and outlet and affecting the operation of the pull member 32 and the detection probe 4. If the distance between the inlet and outlet of the leaking heat transfer tube 5 is short but the diameter is large, the tensioning block 221 can be inserted into the heat transfer tube 5 and the driving rod 222 can be rotated to drive the tensioning block 221 away from the center of the heat transfer tube 5 until the tensioning blocks 221 on all sides contact the inner wall of the heat transfer tube 5, tightening the inlet and outlet of the heat transfer tube 5. This in turn drives the support frame 21 to be fixedly installed at the inlet and outlet of the heat transfer tube 5, facilitating installation and removal. This does not cause wear on the heat transfer tube 5, extending its service life, making it suitable for more installation environments and expanding its scope of use.

[0061] An arc groove is provided on one side of the tensioning block 221 close to the center of the heat transfer tube 5, which can increase the contact area of ​​the multiple tensioning blocks 221 clamped on the heat transfer tube 5, thereby improving the clamping strength and stability, making the detection process more stable and accurate.

[0062] The side of the tensioning block 221 away from the center of the heat transfer tube 5 is set to an arc shape, which can increase the contact area of ​​multiple tensioning blocks 221 on the heat transfer tube 5, thereby improving the tensioning strength and stability, making the detection process more stable and accurate. The arc groove can also reduce the space occupied by the tensioning block 221 in the heat transfer tube 5, so that the pulling member 32 and the detection probe 4 have more operating space, which is convenient for movement and detection.

[0063] See also Figure 1 In some embodiments, the detection device for the steam generator heat transfer tube further includes a guide member 6, which is mounted on the support assembly 2. The guide member 6 is provided with a through hole so that the pushing and pulling mechanism can smoothly transport the transmission member 3 to the transmission sleeve 11.

[0064] The present application utilizes a guide member 6 mounted on the support assembly 2, which is provided with a through hole, so that the pushing and pulling mechanism can smoothly convey the transmission member 3 to the transmission sleeve 11. The guide member 6 can be in the shape of a bell or a cone. It is only necessary for the diameter of the guide member 6 to gradually increase from close to far from the heat transfer tube 5, so that the pulling member 32 can be guided by the guide member 6 and then enter the heat transfer tube 5 through the transmission sleeve 11. When the pulling member 32 is flexible, it can play a certain supporting role, preventing the pulling member 32 from being excessively bent outside the heat transfer tube 5 and affecting the drive of the transmission sleeve 11. This can make the pulling member 32 reach the transmission sleeve 11 more smoothly, improve the smoothness of the operation of the detection device, improve safety, improve the efficiency of power transmission, reduce the torque on the pulling member 32, and extend its service life.

[0065] It can be understood that the above embodiments only express the preferred implementation methods of the present invention, and the description thereof is relatively specific and detailed, but it cannot be understood as limiting the patent scope of the present invention. It should be pointed out that for ordinary technicians in this field, without departing from the concept of the present invention, the above technical features can be freely combined, and several deformations and improvements can be made, all of which fall within the scope of protection of the present invention. Therefore, all equivalent changes and modifications made to the scope of the claims of the present invention should fall within the scope of coverage of the claims of the present invention.

Claims

1. A detection device for a steam generator heat transfer tube, characterized in that: include: A driving assembly (1), a transmission member (3), a detection probe (4), and a support assembly (2) for detachably mounting on the inlet and outlet of a heat transfer tube (5); The driving assembly (1) is mounted on the supporting assembly (2) and connected to the transmission member (3); the front end of the transmission member (3) is connected to the detection probe (4), and their relative positions are maintained; the detection probe (4) extends into the heat transfer tube (5), and the driving assembly (1) is always located outside the heat transfer tube (5); The driving assembly (1) drives the detection probe (4) through the transmission member (3) to rotate in the heat transfer tube (5) and move along the heat transfer tube (5).

2. The detection device for steam generator heat transfer tubes according to claim 1, characterized in that: At least a portion of the detection probe (4) is in abutment with, or in sliding connection with, or in clearance fit with the inner wall of the heat transfer tube (5).

3. The detection device for a steam generator heat transfer tube according to claim 1, characterized in that: The driving assembly (1) comprises: a transmission sleeve (11) and a power source (12); the transmission sleeve (11) is rotatably connected to the support assembly (2); the power source (12) is installed on the support assembly (2) to drive the transmission sleeve (11) to rotate, and the transmission member (3) is driven to rotate by radial limiting between the transmission member (3) and the transmission sleeve (11).

4. The detection device for the steam generator heat transfer tube according to claim 3, characterized in that: The detection probe (4) comprises: a detection module (41) and a bearing member (42); a plurality of the detection modules (41) are arranged on the outer wall surface of the bearing member (42); the bearing member (42) is mounted on the transmission member (3); the power source (12) drives the transmission member (3) to rotate back and forth along its axis through the transmission sleeve (11); the reciprocating rotation angle range is 30°-120°; so that the plurality of detection modules (41) are displaced in the heat transfer tube (5) while performing reciprocating rotation detection.

5. The detection device for steam generator heat transfer tubes according to claim 4, characterized in that: The detection probe (4) further comprises a support member (43) mounted at the front end or / and the rear end of the carrier (42); the diameter of the support member (43) is larger than the diameter of the carrier (42) and is in contact with the inner wall of the heat transfer tube (5).

6. The detection device for steam generator heat transfer tubes according to claim 3, characterized in that: The transmission member (3) comprises: a connecting block (31) and a pulling member (32); the connecting block (31) is mounted on the pulling member (32) and is detachably connected to the detection probe (4); the pulling member (32) and the transmission sleeve (11) are mutually limited in radial direction.

7. The detection device for the steam generator heat transfer tube according to claim 6, characterized in that: The detection device for the heat transfer tube of the steam generator further comprises a pushing and pulling mechanism, the pulling piece (32) is flexible, and the pulling piece (32) located outside the heat transfer tube (5) is wound around the pushing and pulling mechanism.

8. The detection device for a steam generator heat transfer tube according to claim 1, characterized in that: The support assembly (2) comprises a support frame (21) and a plurality of locking members (22). The support frame (21) is detachably mounted on the inlet and outlet of the heat transfer tube (5) via the plurality of locking members (22).

9. The detection device for a steam generator heat transfer tube according to claim 8, characterized in that: The locking member (22) comprises: a tensioning block (221) and a driving rod (222); the tensioning block (221) is slidably connected to the support frame (21); the driving rod (222) is rotatably connected to the support frame (21), and is mounted on the support frame (21) via a threaded pair, driving the tensioning block (221) away from or close to the center of the heat transfer tube (5), so that the plurality of tensioning blocks (221) cooperate with each other to tighten or clamp the support frame (21) on the heat transfer tube (5).

10. The detection device for a steam generator heat transfer tube according to claim 7, characterized in that: The detection device for the steam generator heat transfer tube further comprises a guide member (6), the guide member (6) being mounted on the support assembly (2), and a through hole being provided on the guide member (6), so that the pushing and pulling mechanism can smoothly transport the transmission member (3) to the transmission sleeve (11).

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