Vibration detection device

Abstract

The invention provides a vibration detection device. The vibration detection device comprises a trolley body assembly which is used for being arranged at the center position of a plurality of heat transfer pipes, and the trolley body assembly can move in the length direction of the heat transfer pipes and is fixed to the heat transfer pipes; the detection chuck assembly is used for clamping or loosening one heat transfer tube and collecting a vibration signal of the heat transfer tube in a clamping state; the chuck deflection assembly is arranged on the trolley body assembly and used for driving the detection chuck assembly to deviate towards the center positions of the heat transfer pipes so as to facilitate movement of the trolley body assembly in the length direction of the heat transfer pipes; and the hammer head assembly is arranged on the trolley body assembly and is used for impacting the clamped heat transfer pipe to generate vibration. The invention provides a vibration detection device which is high in integration level and can effectively complete vibration frequency detection of a heat transfer tube of a steam generator in a limited space.

Description

Technical Field

[0001] The present invention relates to the technical field of nuclear power plant equipment testing, and particularly relates to a vibration detection device. Background Art

[0002] The heat transfer tubes of a nuclear power plant steam generator are key components for heat exchange in the nuclear power plant and are the isolation boundary between the primary and secondary loops of the nuclear power plant. Their integrity is crucial for preventing the leakage of radioactive fission products.

[0003] The heat exchange efficiency of the heat transfer tubes depends on the heat transfer area of the heat transfer tubes. Therefore, the heat transfer tubes of a nuclear power plant steam generator are generally composed of very long U-shaped tubes. Due to the excessive length of the heat transfer tubes, when the steam generator vibrates, the heat transfer tubes far from the tube sheet end are severely worn between the support plates. In order to measure the influence of the vibration of the heat transfer tubes on the wear of the heat transfer tubes, it is necessary to detect the vibration frequency of the heat transfer tubes under the constraint of multiple support plates. Provide effective parameters for the subsequent structural design and thermal-hydraulic design of the steam generator. Summary of the Invention

[0004] In view of the above problems in the prior art, the present invention proposes a vibration detection device with high integration, which can effectively complete the detection of the vibration frequency of the heat transfer tubes of the steam generator in a limited space.

[0005] Specifically, the present invention proposes a vibration detection device applicable to the heat transfer tubes of a steam generator. There are multiple heat transfer tubes provided inside the outer wall of the steam generator. The heat transfer tubes are U-shaped, and the multiple heat transfer tubes are arranged in parallel at intervals. The vibration detection device includes:

[0006] A trolley body assembly for being arranged at the central position of the multiple heat transfer tubes. The trolley body assembly can move along the length direction of the multiple heat transfer tubes and is fixed on the heat transfer tubes;

[0007] A detection chuck assembly for clamping or loosening one of the heat transfer tubes and collecting the vibration signal of the heat transfer tube in the clamped state;

[0008] A chuck deflection assembly arranged on the trolley body assembly for driving the detection chuck assembly to deflect towards the central position of the multiple heat transfer tubes to facilitate the movement of the trolley body assembly along the length direction of the multiple heat transfer tubes;

[0009] A hammer head assembly arranged on the trolley body assembly for hitting the clamped heat transfer tube to generate vibration.

[0010] According to an embodiment of the present invention, the trolley body assembly includes a first substrate, a second substrate, and a first driving mechanism. The first driving mechanism is used to drive the first substrate and the second substrate to approach or separate from each other. In the separated state, the trolley body assembly is fixed on the heat transfer tube. The outer side of the first substrate is attached to one side inside the U-shaped structure of the heat transfer tube, and the outer side of the second substrate is attached to the other side inside the U-shaped structure of the heat transfer tube.

[0011] According to an embodiment of the present invention, elastic positioning plates are provided on the outer sides of the first substrate and the second substrate and cooperate with the heat transfer tube structure. The elastic positioning plates are adapted to be clamped between adjacent heat transfer tubes.

[0012] When the trolley body assembly moves along the length direction of multiple heat transfer tubes, the elastic positioning plates are squeezed by the inner side of the U-shaped structure of the heat transfer tube and retract into the first substrate or the second substrate. When the elastic positioning plates move between adjacent heat transfer tubes, the elastic positioning plates are elastically reset and clamped between adjacent heat transfer tubes.

[0013] According to an embodiment of the present invention, the first driving mechanism includes a first driving motor, a first lead screw, and a push rod. The first driving motor is used to drive the first lead screw to rotate, and the first lead screw drives the first substrate and the second substrate to approach or separate from each other through the push rod.

[0014] According to an embodiment of the present invention, the trolley body assembly further includes a trolley tail rod arranged along its length direction. The trolley tail rod is pushed or pulled to make the trolley body assembly reach the test position.

[0015] According to an embodiment of the present invention, the detection chuck assembly includes a first base, a second driving mechanism, and a dovetail clip. The second driving mechanism is arranged on the first base, and the second driving mechanism is used to drive the dovetail clip to clamp or loosen the heat transfer tube.

[0016] According to an embodiment of the present invention, the second driving mechanism includes a linear guide rail, two linear slider assemblies, a second lead screw, and a second driving motor. The linear guide rail and the second driving motor are arranged on the first base. The linear slider assemblies are arranged on the linear guide rail and are in sliding cooperation with the linear guide rail. The second driving motor is used to drive the second lead screw to rotate. The second lead screw cooperates with the linear slider assemblies, and the second lead screw is used to drive the two linear slider assemblies to approach or separate from each other.

[0017] When the two linear slider assemblies approach each other, the two sides of the dovetail clip are squeezed to loosen the heat transfer tube. When the two linear slider assemblies separate from each other, the two sides of the dovetail clip are loosened to clamp the heat transfer tube.

[0018] According to an embodiment of the present invention, the detection chuck assembly further includes a camera disposed on the first base, and the camera is used to observe the process of the clip clamping the heat transfer tube.

[0019] According to an embodiment of the present invention, the chuck offset assembly includes a second base and a third driving mechanism disposed on the second base. The second base is disposed on the first substrate, and the third driving mechanism is used to drive the detection chuck assembly to offset towards the central position of multiple heat transfer tubes;

[0020] The third driving mechanism includes a third driving motor, a third lead screw, and a third lead screw nut. The third driving motor is disposed on the second base. The bottom of the third lead screw nut is engaged with the third lead screw. A guiding groove is formed on the bottom surface of the first base, and the top of the third lead screw nut is engaged with the guiding groove. The third driving motor is used to drive the third lead screw to rotate, and the third lead screw drives the third lead screw nut to move in the length direction of the third lead screw, so that the first base offsets towards the central position of multiple heat transfer tubes.

[0021] According to an embodiment of the present invention, the hammer head assembly includes a third base, an energy storage reed, a hammer head, and a fourth driving mechanism. The third base and the fourth driving mechanism are disposed on the second substrate. One end of the energy storage reed is fixed to the third base, and the other end is fixed to the hammer head. The fourth driving mechanism is used to move the hammer head to provide potential energy for hammering the heat transfer tube.

[0022] According to an embodiment of the present invention, a V-shaped groove is provided on the bottom surface of the hammer head. The fourth driving mechanism includes a fourth driving motor, a fourth lead screw, and a push block. The fourth driving motor is used to drive the fourth lead screw to rotate. The push block is engaged with the fourth lead screw, and the fourth lead screw drives the push block to move in the length direction of the fourth lead screw;

[0023] One side of the V-shaped groove is parallel to the length direction of the fourth lead screw. A hammer head reed is provided in the V-shaped groove for changing the moving direction of the push block in the V-shaped groove to provide the hammer head deviating from the length direction of the fourth lead screw.

[0024] The present invention provides a vibration detection device with high integration. The heat transfer tube is automatically impacted by the hammer head assembly, thereby completing the vibration frequency detection of the heat transfer tube of the steam generator.

[0025] It should be understood that the above general description and the following detailed description of the present invention are both exemplary and explanatory, and are intended to provide further explanation of the present invention as claimed. Description of the Drawings

[0026] The accompanying drawings are provided to provide a further understanding of the present invention, and they are incorporated into and constitute a part of this application. The accompanying drawings illustrate embodiments of the present invention and, together with this specification, serve to explain the principles of the present invention.

[0027] In the accompanying drawings:

[0028] Figure 1 A schematic structural diagram of a vibration detection device showing an embodiment of the present invention.

[0029] Figure 2 A diagram showing the usage state of a vibration detection device showing an embodiment of the present invention.

[0030] Figure 3 A schematic structural diagram of a trolley body assembly showing an embodiment of the present invention.

[0031] Figure 4 A schematic structural diagram of a detection chuck assembly showing an embodiment of the present invention.

[0032] Figure 5 is Figure 4 A partial enlarged schematic diagram of...

[0033] Figure 6 A schematic structural diagram of a chuck deflection assembly showing an embodiment of the present invention.

[0034] Figure 7 is Figure 6 A partial enlarged schematic diagram of...

[0035] Figure 8 A schematic structural diagram of a hammer head assembly showing an embodiment of the present invention.

[0036] Figure 9 A schematic structural diagram of the bottom surface of a hammer head assembly showing an embodiment of the present invention.

[0037] Among them, the above-mentioned accompanying drawings include the following reference numerals:

[0038] Vibration detection device 100

[0039] Heat transfer tube 101

[0040] Trolley body assembly 200

[0041] First substrate 201

[0042] Second substrate 202

[0043] Elastic positioning plate 203

[0044] First drive motor 204

[0045] The first lead screw 205

[0046] The push rod 206

[0047] The push rod shaft 207

[0048] The first lead screw nut 208

[0049] The fixed seat 209 The lead screw fixing sleeve 210 The mounting flange 211 The trolley tail rod 212 The roller 213 The trolley middle beam 214 The cable sheath plug 215 The detection chuck assembly 300

[0050] The first base 301 The dovetail clip 302 The linear guide 303

[0051] The second lead screw 304 The second drive motor 305 The camera bracket 306 The chuck base 307 The chuck 308

[0052] The second lead screw nut 309 The foreign object prevention cover 310 The second motor coupling 311 The motor bracket 312 The camera 313 The vibration sensor 314 The chuck deflection assembly 400

[0053] The second base 401 The third drive motor 402

[0054] The third lead screw 403 The third lead screw nut 404 The third coupling 405 The lead screw sheath 406 The hammer head assembly 500

[0055] The third base 501

[0056] The energy storage reed 502

[0057] The hammer head 503

[0058] The V-groove 504

[0059] Fourth drive motor 505

[0060] Fourth lead screw 506

[0061] Pusher block 507

[0062] Hammer head reed 508

[0063] Motor mounting plate 509

[0064] Lead screw mounting seat 510 Detailed implementation manners

[0065] It should be noted that, without conflict, the embodiments in the present application and the features in the embodiments may be combined with each other.

[0066] Next, the technical solutions in the embodiments of the present application will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and in no way restricts the present application and its application or use. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present application.

[0067] It should be noted that the terms used herein are only for describing specific implementation manners and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless otherwise clearly specified in the context, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "include" and / or "comprise" are used in this specification, they indicate the presence of features, steps, operations, devices, components and / or their combinations.

[0068] Unless otherwise specifically stated, the relative arrangements of components and steps, numerical expressions and values set forth in these embodiments do not limit the scope of the present application. At the same time, it should be understood that, for the sake of convenience of description, the dimensions of the various parts shown in the drawings are not drawn in actual proportional relationships. Technologies, methods and devices known to those of ordinary skill in the relevant art may not be discussed in detail, but where appropriate, the technologies, methods and devices should be regarded as part of the authorized specification. In all the examples shown and discussed here, any specific value should be construed as merely exemplary and not as a limitation. Therefore, other examples of the exemplary embodiments may have different values. It should be noted that: like reference numerals and letters denote like items in the following drawings, and thus, once an item is defined in one drawing, it does not need to be further discussed in subsequent drawings.

[0069] In the description of the present application, it should be understood that the orientation or positional relationship indicated by orientation terms such as "front, rear, upper, lower, left, right", "lateral, vertical, perpendicular, horizontal" and "top, bottom", etc. is usually based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present application and simplifying the description. Without contrary explanation, these orientation terms do not indicate or imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation on the protection scope of the present application; the orientation terms "inside, outside" refer to the inside and outside relative to the contour of each component itself.

[0070] For ease of description, spatial relative terms such as "above", "over", "on the upper surface", "above-mentioned", etc. may be used herein to describe the spatial positional relationship of one device or feature to other devices or features as shown in the figures. It should be understood that the spatial relative terms are intended to encompass different orientations in use or operation in addition to the orientation depicted in the figures. For example, if the device in the figures is inverted, the device described as "above" or "over" other devices or structures will then be positioned "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both the orientation of "above" and "below". The device may also be positioned in other different ways, rotated 90 degrees or in other orientations, and corresponding interpretations should be made to the spatial relative descriptions used herein.

[0071] In addition, it should be noted that the use of terms such as "first", "second", etc. to limit components is only for the convenience of distinguishing the corresponding components. Without additional statement, the above terms have no special meaning. Therefore, it should not be construed as a limitation on the protection scope of the present application. In addition, although the terms used in the present application are selected from well-known and commonly used terms, some of the terms mentioned in the specification of the present application may be selected by the applicant according to his or her judgment, and their detailed meanings are described in the relevant parts of the description herein. In addition, it is required to understand the present application not only through the actual terms used, but also through the meaning implied by each term.

[0072] Figure 1 The structural schematic diagram of a vibration detection device according to an embodiment of the present invention is shown. Figure 2 The usage state diagram of a vibration detection device according to an embodiment of the present invention is shown. As shown in the figure, the present invention provides a vibration detection device 100 applicable to the heat transfer tube 101 of a steam generator. Refer to Figure 2, a plurality of heat transfer tubes 101 are provided inside the outer wall (not shown in the figure) of the steam generator. Each single heat transfer tube 101 is U-shaped, and the plurality of heat transfer tubes 101 are arranged in parallel at intervals. In fact, the steam generator has a mounting seat for mounting the plurality of heat transfer tubes 101, and the surface is circular. The plurality of heat transfer tubes 101 are arranged in parallel at intervals along the diameter direction of the mounting seat. The vibration detection device 100 is inserted into the U-shaped structure of the plurality of heat transfer tubes 101, corresponding to the central position of the plurality of heat transfer tubes 101, that is, the diameter direction of the mounting seat. The vibration detection device 100 includes:

[0073] A trolley body assembly 200, which is used to be arranged at the central position of the plurality of heat transfer tubes 101. The trolley body assembly 200 can move along the length direction of the plurality of heat transfer tubes 101 and is fixed on the heat transfer tubes 101. That is to say, the trolley body assembly 200 can move along the diameter direction of the mounting seat and is fixed.

[0074] A detection chuck assembly 300, which is used to clamp or release a heat transfer tube 101, and collect the vibration signal of the heat transfer tube 101 in the clamped state. Through the trolley body assembly 200 and the detection chuck assembly 300, the vibration detection device 100 is fixed on the heat transfer tube 101.

[0075] A chuck deflection assembly 400, which is arranged on the trolley body assembly 200 and is used to drive the detection chuck assembly 300 to deflect towards the central position of the plurality of heat transfer tubes 101. Specifically, because the test requirements of vibration detection are to perform vibration detection on each heat transfer tube 101, the trolley body assembly 200 needs to move along the diameter direction of the mounting seat and sequentially impact each heat transfer tube 101 to obtain the corresponding vibration signal. Therefore, before the trolley body assembly 200 moves, it is necessary to move the detection chuck assembly 300 towards the diameter of the mounting seat, that is, to deflect towards the central position of the plurality of heat transfer tubes 101, so as to avoid the heat transfer tubes 101 and prevent damage caused by colliding with the heat transfer tubes 101. After the trolley body assembly 200 moves to the target position, the chuck deflection assembly 400 drives the detection chuck assembly 300 to reset.

[0076] A hammer head assembly 500, which is arranged on the trolley body assembly 200 and is used to impact the clamped heat transfer tube 101 to generate vibration.

[0077] Because the operation space formed inside the plurality of U-shaped heat transfer tubes 101 is limited, the vibration detection device 100 provided by the present invention has a high integration degree and a small overall size, and can penetrate into the plurality of U-shaped heat transfer tubes 101 to complete the vibration test work.

[0078] Figure 3The structural schematic diagram of the trolley body assembly according to an embodiment of the present invention is shown. As shown in the figure, the trolley body assembly 200 includes a first substrate 201, a second substrate 202, and a first driving mechanism. The first driving mechanism is used to drive the first substrate 201 and the second substrate 202 to approach or separate from each other. Combining Figure 2 As shown, in the separated state, the trolley body assembly 200 is fixed on the heat transfer tube 101. The outer side of the first substrate 201 is attached to one side inside the U-shaped structure of the heat transfer tube 101, and the outer side of the second substrate 202 is attached to the other side inside the U-shaped structure of the heat transfer tube 101.

[0079] Preferably, elastic positioning plates 203 are provided on the outer sides of the first substrate 201 and the second substrate 202. The elastic positioning plates 203 are structurally matched with the heat transfer tube 101, and their sizes are matched with the spacing between adjacent heat transfer tubes 101, so that the elastic positioning plates 203 are adapted to be clamped between adjacent heat transfer tubes 101.

[0080] When the trolley body assembly 200 moves along the length direction of multiple heat transfer tubes 101, the elastic positioning plates 203 are squeezed by the inner side of the U-shaped structure of the heat transfer tube 101 and retract into the first substrate 201 or the second substrate 202. When the elastic positioning plates 203 move between adjacent heat transfer tubes 101, the elastic positioning plates 203 are elastically reset and clamped between adjacent heat transfer tubes 101.

[0081] Preferably, the first driving mechanism includes a first driving motor 204, a first lead screw 205, and a push rod 206. The first driving motor 204 is used to drive the first lead screw 205 to rotate, and the first lead screw 205 drives the first substrate 201 and the second substrate 202 to approach or separate from each other through the push rod 206. Specifically, the first substrate 201 and the second substrate 202 are arranged in parallel at intervals, the first lead screw 205 is basically located between the first substrate 201 and the second substrate 202, and the length directions of the three are the same. Both the first substrate 201 and the second substrate 202 have a double-layer structure and are fixed up and down through a push rod shaft 207. One end of the push rod 206 is rotatably connected with a first lead screw nut 208 on the first lead screw 205, and the other end extends into the double-layer structure and is rotatably connected with the push rod shaft 207. The first lead screw 205 rotates to drive the first lead screw nut 208 to move on the first lead screw 205, and the first lead screw nut 208 drives the push rod 206 to extend or retract outwards, thereby driving the first substrate 201 and the second substrate 202 to separate or approach each other. The first driving mechanism further includes a fixed seat 209 and a lead screw fixing sleeve 210 for positioning the first lead screw 205. The first driving mechanism further includes a mounting flange 211 for mounting the first driving motor 204.

[0082] Preferably, the trolley body assembly 200 further includes a trolley tail rod 212 disposed along its length direction. Push and pull the trolley tail rod 212 to move the trolley body assembly 200 to the test position. Refer to Figure 2 , a detection hole is formed in the outer wall of the steam generator, and the trolley body assembly 200 can extend into the detection hole in a closed state (the first substrate 201 and the second substrate approach each other). The first substrate 201 and the second substrate 202 are controlled by the first driving motor 204 to separate, and the trolley tail rod 212 is pulled back so that one side in the length direction of the first substrate 201 and the second substrate 202 touches the outer wall. At this time, the detection chuck assembly 300 is adapted to clamp the first heat transfer tube 101 near the outer wall side. Therefore, the trolley tail rod 212 is used to determine the initial detection position of the trolley body assembly 200. The trolley body assembly 200 further includes a trolley middle beam 214, and the first driving mechanism is disposed on the trolley middle beam 214. The trolley tail rod 212 is fixed to the tail end of the trolley middle beam 214.

[0083] Preferably, rollers 213 are provided on the first substrate 201 and the second substrate 202 to facilitate the movement of the trolley body assembly 200 in the steam generator.

[0084] Preferably, the trolley body assembly 200 further includes a cable sheath plug 215, which is disposed on the mounting flange 211. The cable sheath plug 215 is used to connect to an external cable.

[0085] Figure 4 The structural schematic diagram of the detection chuck assembly according to an embodiment of the present invention is shown. Figure 5 is Figure 4 The partial enlarged schematic diagram of. As shown in the figure, the detection chuck assembly 300 includes a first base 301, a second driving mechanism, and a dovetail clip 302. The second driving mechanism is disposed on the first base 301, and the second driving mechanism is used to drive the dovetail clip 302 to clamp or loosen the heat transfer tube 101.

[0086] Preferably, the second driving mechanism includes a linear guide rail 303, two linear slider assemblies, a second lead screw 304, and a second driving motor 305. The linear guide rail 303 and the second driving motor 305 are disposed on the first base 301. The two linear slider assemblies are disposed on the linear guide rail 303 and are slidably engaged with the linear guide rail 303. The second driving motor 305 is used to drive the second lead screw 304 to rotate, and the second lead screw 304 is engaged with the linear slider assemblies. The second lead screw 304 is used to drive the two linear slider assemblies to approach or separate from each other. When the two linear slider assemblies approach each other, the two sides of the dovetail clip 302 are squeezed to loosen the heat transfer tube 101; when the two linear slider assemblies separate from each other, the two sides of the dovetail clip 302 are loosened to clamp the heat transfer tube 101.

[0087] Preferably, the linear slider assembly includes a chuck base 307, a chuck 308, and a second lead screw nut 309. The chuck base 307 is slidably engaged with the linear guide 303. The chuck 308 is fixed to the chuck base 307. The second lead screw nut 309 is fixed to one side of the chuck 308. The chucks 308 of the two linear slider assemblies are arranged oppositely. When the second lead screw 304 rotates, the two second lead screw nuts 309 move closer to or away from each other, thereby driving the two chucks 308 to move closer to or away from each other, so as to clamp or loosen the heat transfer tube 101 with the clip 302. More preferably, a foreign object prevention cover 310 is provided on one side of the chuck base 307 to prevent foreign objects from entering the gap between the chuck base 307 and the linear guide 303 and thus affecting the movement of the linear slider. More preferably, the second drive mechanism further includes a second motor coupling 311 and a motor bracket 312. The second drive motor 305 is mounted on the first base 301 through the motor bracket 312, and the second drive motor 305 drives the second lead screw 304 to rotate through the second motor coupling 311.

[0088] Preferably, the detection chuck assembly 300 further includes a camera 313 disposed on the first base 301. The camera 313 is used to observe the process of the clip 302 clamping the heat transfer tube 101, facilitating remote monitoring. The detection chuck assembly 300 further includes a camera bracket 306 for mounting the camera 313.

[0089] Preferably, a vibration sensor 314 is disposed on the clip 302 for collecting vibration signals.

[0090] Figure 6 The structural schematic diagram of the chuck deflection assembly according to an embodiment of the present invention is shown. Figure 7 is Figure 6 The partial enlarged schematic diagram of... As shown in the figure, the chuck offset assembly 400 includes a second base 401 and a third drive mechanism disposed on the second base 401. The second base 401 is disposed on the first substrate 201, and the third drive mechanism is used to drive the detection chuck assembly 300 to offset towards the central position of the plurality of heat transfer tubes 101.

[0091] Among them, the third driving mechanism includes a third driving motor 402, a third lead screw 403 and a third lead screw nut 404. The third driving motor 402 is arranged on the second base 401. The bottom of the third lead screw nut 404 is engaged with the third lead screw 403. A guiding groove is formed on the bottom surface of the first base 301. The top of the third lead screw nut 404 is engaged with the guiding groove. The third driving motor 402 is used to drive the third lead screw 403 to rotate. The third lead screw 403 drives the third lead screw nut 404 to move in the length direction of the third lead screw 403. By cooperating with the guiding groove of the first base 301, the first base 301 is offset towards the central position of the plurality of heat transfer tubes 101. It is easy to understand that the vibration test needs to test each heat transfer tube 101 in sequence. The clip 302 needs to clamp and release each heat transfer tube 101 in sequence. When the clip 302 releases a heat transfer tube 101, if the vibration detection device 100 is moved at this time, the clip 302 will surely collide with the heat transfer tube 101 and cause damage. Therefore, it is necessary to drive the detection chuck assembly 300 to offset towards the central position of the plurality of heat transfer tubes 101 through the chuck offset assembly 400 so that the clip 302 can avoid the heat transfer tube 101. When the trolley body assembly 200 moves to the next test position, the third lead screw 403 is rotated in the reverse direction to drive the third lead screw nut 404 to move in the reverse direction, so that the clip 302 is reset to perform subsequent test work.

[0092] Preferably, the third driving mechanism further includes a third coupling 405 and a lead screw sheath 406. The third driving motor 402 drives the third lead screw 403 to rotate through the third coupling 405. The third lead screw 403 is arranged inside the lead screw sheath 406. The lead screw sheath 406 prevents foreign objects from entering and ensures the movement of the third lead screw nut 404.

[0093] Figure 8 The structural schematic diagram of the hammer head assembly according to an embodiment of the present invention is shown. Figure 9 The structural schematic diagram of the bottom surface of the hammer head assembly according to an embodiment of the present invention is shown. As shown in the figure, the hammer head assembly 500 includes a third base 501, an energy storage reed 502, a hammer head 503 and a fourth driving mechanism. The third base 501 and the fourth driving mechanism are arranged on the second substrate 202. One end of the energy storage reed 502 is fixed on the third base 501, and the other end is fixed on the hammer head 503. The fourth driving mechanism is used to move the hammer head 503 to provide the potential energy of the energy storage reed 502 for hammering the heat transfer tube 101.

[0094] Preferably, a V-shaped groove 504 is provided on the bottom surface of the hammer head 503. The fourth driving mechanism includes a fourth driving motor 505, a fourth lead screw 506 and a push block 507. The fourth driving motor 505 is used to drive the fourth lead screw 506 to rotate. The push block 507 is rotationally engaged with the fourth lead screw 506. The fourth lead screw 506 drives the push block 507 to move in the length direction of the fourth lead screw 506.

[0095] One side of the V-shaped groove 504 is parallel to the length direction of the fourth lead screw 506. A hammer reed 508 is provided in the V-shaped groove 504 for changing the moving direction of the push block 507 in the V-shaped groove 504, so that the hammer head 503 deviates from the length direction of the fourth lead screw 506. Specifically, the fourth driving motor 505 drives the fourth lead screw 506 to rotate. When the fourth lead screw 506 drives the push block 507 into one side of the V-shaped groove 504 and approaches the bottom of the V-shaped groove 504, the hammer reed 508 is toggled to the end of the fourth lead screw 506. Subsequently, the fourth driving motor 505 reverses, driving the fourth lead screw 506 to rotate in the reverse direction. The push block 507 is restricted by the hammer reed 508 and moves along the other side (hypotenuse) of the V-shaped groove 504, thereby driving the hammer head 503 to deflect and the energy storage reed 502 to bend. The included angle between the two sides of the V-shaped groove 504 is about 20°. When the push block 507 leaves the V-shaped groove 504, the energy storage reed 502 resets, driving the hammer head 503 to strike the heat transfer tube 101.

[0096] Preferably, the fourth driving mechanism further includes a motor mounting plate 509 and a lead screw mounting seat 510 provided on the second substrate 202. The fourth driving motor 505 is mounted on the motor mounting plate 509, and the fourth lead screw 506 is fixedly mounted on the lead screw mounting seat 510.

[0097] Preferably, the energy storage reed 502 is formed by six overlapping reeds. Through the overlapping connection method, the energy storage strength and stability are ensured.

[0098] The operation process of the vibration detection device 100 is described below in combination with all the drawings:

[0099] First, connect the vibration detection device 100 to the manual remote control, and mainly access multiple driving mechanisms in a wireless or wired manner. After debugging all actions without errors, the operator sends the vibration detection device 100 in the closed state (the first substrate 201 and the second substrate 202 are close to each other) into the central area of the U-shaped heat transfer tube 101 in the steam generator through the detection hole on the outer wall of the steam generator. The operator opens the trolley through the manual remote control, so that the outer sides of the first substrate 201 and the second substrate 202 are basically attached to both sides inside the U-shaped tube, and pulls back the tail rod 212 of the trolley to position it at the first heat transfer tube 101 close to the outer wall. The elastic positioning plates 203 on the outer sides of the first substrate 201 and the second substrate 202 are engaged between adjacent heat transfer tubes 101 to ensure the correct position of the detection chuck assembly 300.

[0100] Next, the installer holds the paper clip 302 and inserts it into the detection hole to install it on the first heat transfer tube 101. Push the paper clip 302 downward so that the tail of the paper clip 302 cooperates with the second driving mechanism of the detection chuck assembly 300. Start the hammer head assembly 500 to act, so that the hammer head 503 deviates, the energy storage reed 502 bends, and control the hammer head 503 to strike the clamped first heat transfer tube 101 to obtain corresponding vibration data.

[0101] Then, the second driving mechanism drives the paper clip 302 to release the first heat transfer tube 101, and the detection chuck assembly 300 deflects inward and retracts through the chuck deflection assembly 400. At this time, the operator can hold the auxiliary tool marked with scales and push the trolley body assembly 200 forward. Since the two elastic positioning plates 203 are in a state of being embedded in the tube spacing, there will be obvious surface jumps during the movement, which can give position feedback to the operator. After the detection chuck assembly 300 is aligned with the second heat transfer tube 101, the detection chuck assembly 300 deflects outward and extends through the chuck deflection assembly 400, and the second driving mechanism drives the paper clip 302 to clamp the second heat transfer tube 101. Continue to start the hammer head assembly 500 to act, store energy again and strike the second heat transfer tube 101 to obtain corresponding vibration data. Repeat this process until the vibration frequency inspection of all heat transfer tubes 101 is completed.

[0102] A vibration detection device provided by the present invention has the following advantages:

[0103] 1) Fix the vibration detection device with a paper clip structure to obtain vibration signals;

[0104] 2) Highly integrated, can be installed through an 88mm detection hole on the outer wall;

[0105] 3) The vibration detection device can move back and forth, is convenient to operate, and the detection operation covers all heat transfer tubes;

[0106] 4) The operation is visual, and can be remotely monitored through a camera.

[0107] It is obvious to those skilled in the art that various modifications and variations can be made to the above exemplary embodiments of the present invention without departing from the spirit and scope of the present invention. Therefore, it is intended that the present invention cover modifications and variations of the present invention falling within the scope of the appended claims and their equivalent technical solutions.

Claims

1. A vibration detection device is applicable to the heat transfer tubes of a steam generator. A plurality of heat transfer tubes are provided inside the outer wall of the steam generator. The heat transfer tubes are U-shaped, and the plurality of heat transfer tubes are arranged in parallel at intervals. The vibration detection device comprises: A trolley body assembly for being arranged at the central position of the plurality of heat transfer tubes. The trolley body assembly can move along the length direction of the plurality of heat transfer tubes and is fixed on the heat transfer tubes; A detection chuck assembly for clamping or loosening one of the heat transfer tubes and collecting the vibration signal of the heat transfer tube in the clamped state; A chuck deflection assembly arranged on the trolley body assembly for driving the detection chuck assembly to deflect towards the central position of the plurality of heat transfer tubes to facilitate the movement of the trolley body assembly along the length direction of the plurality of heat transfer tubes; A hammer head assembly arranged on the trolley body assembly for striking the clamped heat transfer tube to generate vibration.

2. The vibration detection device according to claim 1, characterized in that the trolley body assembly includes a first substrate, a second substrate and a first driving mechanism. The first driving mechanism is used for driving the first substrate and the second substrate to approach or separate from each other. In the separated state, the trolley body assembly is fixed on the heat transfer tubes. The outer side of the first substrate is attached to one side inside the U-shaped structure of the heat transfer tube, and the outer side of the second substrate is attached to the other side inside the U-shaped structure of the heat transfer tube.

3. The vibration detection device according to claim 2, characterized in that elastic positioning plates are provided on the outer sides of the first substrate and the second substrate and are matched with the heat transfer tube structure. The elastic positioning plates are adapted to be clamped between adjacent heat transfer tubes; when the trolley body assembly moves along the length direction of the plurality of heat transfer tubes, the elastic positioning plates are squeezed by the inner side of the U-shaped structure of the heat transfer tubes and retract into the first substrate or the second substrate. When the elastic positioning plates move between adjacent heat transfer tubes, the elastic positioning plates are elastically reset and clamped between adjacent heat transfer tubes.

4. The vibration detection device according to claim 2, characterized in that the first driving mechanism includes a first driving motor, a first lead screw and a push rod. The first driving motor is used for driving the first lead screw to rotate, and the first lead screw drives the first substrate and the second substrate to approach or separate from each other through the push rod.

5. The vibration detection device according to claim 2, characterized in that the trolley body assembly further includes a trolley tail rod arranged along its length direction. Push and pull the trolley tail rod to make the trolley body assembly reach the test position.

6. The vibration detection device according to claim 1, characterized in that the detection chuck assembly includes a first base, a second driving mechanism and a dovetail clip. The second driving mechanism is arranged on the first base, and the second driving mechanism is used for driving the dovetail clip to clamp or loosen the heat transfer tube.

7. The vibration detection device according to claim 6, characterized in that The second driving mechanism includes a linear guide rail, two linear slider assemblies, a second lead screw, and a second driving motor. The linear guide rail and the second driving motor are arranged on the first base. The linear slider assemblies are arranged on the linear guide rail and are in sliding fit with the linear guide rail. The second driving motor is used to drive the second lead screw to rotate. The second lead screw is engaged with the linear slider assemblies, and the second lead screw is used to drive the two linear slider assemblies to approach or separate from each other. When the two linear slider assemblies approach each other, they squeeze both sides of the clip to loosen the clip from the heat transfer tube. When the two linear slider assemblies separate from each other, they release both sides of the clip to clamp the heat transfer tube with the clip.

8. The vibration detection device according to claim 7, wherein, the detection chuck assembly further includes a camera arranged on the first base, and the camera is used to observe the process of the clip clamping the heat transfer tube.

9. The vibration detection device according to claim 6, wherein, the chuck offset assembly includes a second base and a third driving mechanism arranged on the second base. The second base is arranged on the first substrate, and the third driving mechanism is used to drive the detection chuck assembly to offset towards the central position of the plurality of heat transfer tubes. The third driving mechanism includes a third driving motor, a third lead screw, and a third lead screw nut. The third driving motor is arranged on the second base. The bottom of the third lead screw nut is engaged with the third lead screw. A guiding groove is formed on the bottom surface of the first base, and the top of the third lead screw nut is engaged with the guiding groove. The third driving motor is used to drive the third lead screw to rotate, and the third lead screw drives the third lead screw nut to move in the length direction of the third lead screw, so that the first base offsets towards the central position of the plurality of heat transfer tubes.

10. The vibration detection device according to claim 9, wherein, the hammer head assembly includes a third base, an energy storage reed, a hammer head, and a fourth driving mechanism. The third base and the fourth driving mechanism are arranged on the second substrate. One end of the energy storage reed is fixed on the third base, and the other end is fixed on the hammer head. The fourth driving mechanism is used to move the hammer head to provide potential energy for hammering the heat transfer tube.

11. The vibration detection device according to claim 10, wherein, a V-shaped groove is formed on the bottom surface of the hammer head. The fourth driving mechanism includes a fourth driving motor, a fourth lead screw, and a push block. The fourth driving motor is used to drive the fourth lead screw to rotate. The push block is engaged with the fourth lead screw, and the fourth lead screw drives the push block to move in the length direction of the fourth lead screw. One side of the V-shaped groove is parallel to the length direction of the fourth lead screw. A hammer head reed is arranged in the V-shaped groove and is used to change the moving direction of the push block in the V-shaped groove, so as to make the hammer head deviate from the length direction of the fourth lead screw.

Images