CRDM tube socket welding position monitoring device

Abstract

The utility model provides a CRDM tube socket welding position monitoring device, and relates to the CRDM tube socket welding technology field, the CRDM tube socket welding position monitoring device is used for monitoring the position of a tube socket relative to the axis of a top cover, the top cover is provided with a first through hole for the tube socket to pass through, the CRDM tube socket welding position monitoring device comprises a support device, a displacement sensor and a display, the displacement sensor is arranged on the support device, a telescopic probe of the displacement sensor makes contact with the peripheral side wall of the bottom end of the tube base, the displayer is arranged at the position, close to the top end of the tube base, of the top cover, and the displacement sensor is electrically connected with the displayer. After the telescopic probe of the displacement sensor monitors the position change of the bottom end of the tube socket, the change information can be transmitted to the display, and the display is located at the welding position, close to the top end of the tube socket, of the top cover, so that a welder can check the position degree change condition of the tube socket during welding, and the welding efficiency is finally ensured; and the position precision after the tube seat and the top cover are welded is ensured.

Description

TECHNICAL FIELD

[0001] The utility model relates to CRDM pipe seat welding technical field, specifically, relate to a CRDM pipe seat welding position monitoring devices. BACKGROUND

[0002] At present, nuclear power reactor pressure vessel CRDM pipe seat and top cover adopt through type sleeve structure, that is, the top end of CRDM pipe seat passes through the through hole of top cover from bottom to top, CRDM pipe seat and through hole are mainly transition fit, thereby facilitating CRDM pipe seat to pass into the through hole of top cover, and it can be guaranteed that CRDM pipe seat will not fall off before welding.In the process of welding the top end circumferential surface of CRDM pipe seat and top cover, the position degree of pipe seat is required to be higher.Manufacturing plant mainly controls the position degree change (refers to the position change of pipe seat axis relative to top cover axis) of pipe seat through real-time adjustment of welding sequence of welder, and the current technical scheme is to monitor the tangential direction and radial direction of pipe seat bottom end, but because the line of sight of welder is blocked by top cover when welding the top end of pipe seat and top cover, the change state of micrometer cannot be viewed in real time, and then the real-time change trend of pipe seat cannot be grasped, and the position precision of pipe seat after welding cannot be guaranteed. SUMMARY

[0003] The utility model aims at solving the problem that the position precision of CRDM pipe seat and top cover after welding cannot be guaranteed.

[0004] In order to solve the above problem, the utility model provides a CRDM pipe seat welding position monitoring devices for monitoring the position of pipe seat relative to the axis of top cover, the top cover is provided with the first through hole for the pipe seat passes through, CRDM pipe seat welding position monitoring devices includes support device, displacement sensor and display, the displacement sensor is arranged on the support device, and the telescopic probe of displacement sensor is in contact with the circumferential wall of pipe seat bottom end, the display is arranged at the position of top cover adjacent pipe seat top end, and the displacement sensor is electrically connected with the display.

[0005] When the top end of the tube seat passing through the first through hole is welded with the top cover, the CRDM tube seat welding position monitoring device provided by the utility model can be used for monitoring the position of the tube seat relative to the axis of the top cover to implement checking whether the position degree of the tube seat deviates, specifically, the utility model discloses abandoning the mode of monitoring the position degree of the bottom end of the tube seat through a dial gauge, and instead, a displacement sensor is used to implement monitoring whether the position degree of the bottom end of the tube seat deviates, if the position of the bottom end of the tube seat monitored deviates, it indicates that the axis of the tube seat changes relative to the top cover, and then the welding sequence of the welder can be adjusted to correct the position degree of the tube seat, wherein after the telescopic probe of the displacement sensor monitors that the bottom end of the tube seat changes in position, the change information can be transmitted to the display, since the display is located at the welding position of the top cover adjacent to the top end of the tube seat, the welder can check the change of the position degree of the tube seat during welding, finally, the welding efficiency is ensured, and the position precision of the tube seat after being welded with the top cover is ensured.

[0006] Further, the displacement sensor is provided with two, the telescopic direction of the telescopic probe of the two displacement sensors is perpendicular, wherein the telescopic direction of the telescopic probe of one displacement sensor is parallel to the radial direction of the top cover, and the telescopic direction of the telescopic probe of the other displacement sensor is parallel to the tangential direction of the top cover.

[0007] Further, the support device comprises a lifting mechanism and a support structure, the support structure is arranged at the top end of the lifting mechanism, and the displacement sensor is arranged on the support structure.

[0008] Further, the support structure comprises a sensor fixing part, a support plate and a locking structure, the sensor fixing part is used for fixing the displacement sensor, the sensor fixing part is used for moving along the extension direction of the support plate, and the locking structure is used for relatively fixing the sensor fixing part and the support plate, wherein the moving direction of the sensor fixing part is parallel to the telescopic direction of the telescopic probe of the displacement sensor.

[0009] Further, the support plate is provided with a sliding groove extending in the extension length direction, the sensor fixing part comprises a horizontal plate, the horizontal plate is provided with a second through hole, the locking structure comprises a screw rod seat, a screw rod and a locking nut screwed on the screw rod, the screw rod seat is located on the side of the support plate away from the horizontal plate, the bottom end of the screw rod is fixed on the screw rod seat, the top end of the screw rod is sequentially arranged in the sliding groove and the second through hole, and the locking nut is located on the side of the horizontal plate away from the support plate.

[0010] Further, the sensor fixing member further comprises a locking screw and a vertical plate vertically connected with the horizontal plate, the vertical plate is provided with a clamping hole corresponding to the pipe seat along the thickness direction of the plate, the displacement sensor is arranged in the clamping hole, the vertical plate is further provided with a notch slot communicated with the clamping hole, and the vertical plate is further provided with a first screw hole perpendicular to the thickness direction of the notch slot and intersecting with the notch slot, and the locking screw is connected in the first screw hole.

[0011] Further, the lifting mechanism comprises a vertical pipe sleeve, an inner pipe and a jackscrew, the inner pipe is inserted into the pipe sleeve, the pipe sleeve is provided with a second screw hole communicated with the inner and outer walls thereof, a plurality of second screw holes are arranged in sequence along the vertical direction of the pipe sleeve, and the jackscrew is connected with the corresponding second screw hole and used for fastening the inner pipe.

[0012] Further, the support device further comprises a base structure, the CRDM pipe seat welding position monitoring device further comprises a steel mat floor, the lifting mechanism is arranged on the base structure, and the base structure comprises a magnetic attraction base used for being magnetically connected with the steel mat floor.

[0013] Further, the base structure further comprises an insulating pad, the magnetic attraction base is arranged on the insulating pad, and the base structure is in contact with the steel mat floor through the insulating pad.

[0014] Further, the CRDM pipe seat welding position monitoring device further comprises a transmitter, and the displacement sensor is electrically connected with the display through the transmitter. BRIEF DESCRIPTION OF DRAWINGS

[0015] Figure 1 It is a structural schematic view of the CRDM pipe seat welding position monitoring device of the utility model embodiment;

[0016] Figure 2 It is Figure 1 It is an enlarged view of A in the figure;

[0017] Figure 3 It is a front view of the sensor fixing member of the utility model embodiment;

[0018] Figure 4 It is a side view of the sensor fixing member of the utility model embodiment;

[0019] Figure 5 It is a top view of two support plates on the inner pipe of the utility model embodiment.

[0020] EXPLANATION OF REFERENCE NUMERALS:

[0021] 1, pipe seat; 2, top cover; 21, first through hole; 3, displacement sensor; 31, telescopic probe; 4, lifting mechanism; 41, pipe sleeve; 42, inner tube; 43, jackscrew; 5, support structure; 51, support plate; 511, sliding groove; 52, sensor fixing part; 521, horizontal plate; 5211, second through hole; 522, vertical plate; 5221, clamping hole; 5222, notch slot; 5223, first bolt hole; 523, locking bolt; 53, locking structure; 531, screw rod seat; 532, screw rod; 533, locking nut; 6, base structure; 61, magnetic attraction seat; 62, insulating pad; 7, steel pad floor; 8, transmitter; 9, shielded cable; 10, display. DETAILED DESCRIPTION

[0022] In order to make the above-mentioned purpose, features and advantages of the present application more obvious and easy to understand, the specific embodiments of the present application will be described in detail below with reference to the drawings.

[0023] In the description of the present application, it should be understood that the positions or location relationships indicated by the terms "upper", "lower" and the like are based on the positions or location relationships shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as limiting the present application in that the devices or elements referred to must have a specific position, be constructed and operated in a specific position, and therefore cannot be understood as limiting the present application.

[0024] The Z-axis in the drawings represents the vertical direction, i.e. the up-down position, and the positive direction of the Z-axis represents the upper side, and the negative direction of the Z-axis represents the lower side; the Y-axis in the drawings represents the left-right position, and the positive direction of the Y-axis represents the left side, and the negative direction of the Y-axis represents the right side; the X-axis in the drawings represents the longitudinal direction, i.e. the front-rear position, and the positive direction of the X-axis represents the front side, and the negative direction of the X-axis represents the rear side. It should be noted that the meanings of the aforementioned Z-axis, Y-axis and X-axis are only for the convenience of describing the present application and simplifying the description, and are not intended to indicate or imply that the devices or elements referred to must have a specific position, be constructed and operated in a specific position, and therefore cannot be understood as limiting the present application.

[0025] The term "comprising" and its variants are open-ended, i.e. "including but not limited to"; the term "based on" is "at least partially based on"; the term "one embodiment" means "at least one embodiment"; the term "another embodiment" means "at least one additional embodiment"; the term "some embodiments" means "at least some embodiments"; the term "optionally" means "optional embodiments". Related definitions of other terms will be given in the following description. It should be noted that the "first", "second", etc. concepts mentioned in the present application are only used to distinguish different devices, modules or units, and are not intended to limit the functions performed by these devices, modules or units or their mutual dependency.

[0026] It should be noted that the modification of "one" and "multiple" mentioned in the utility model is illustrative rather than restrictive, and those skilled in the art should understand that unless otherwise explicitly indicated in the context, it should be understood as "one or more".

[0027] Referring to Figures 1-2 The CRDM nozzle base welding position monitoring device of the utility model embodiment is used for monitoring the position of the nozzle base 1 relative to the axis of the top cover 2, the top cover 2 is provided with a first through hole 21 for the nozzle base 1 to pass through, the CRDM nozzle base welding position monitoring device comprises a support device, a displacement sensor 3 and a display 10, the displacement sensor 3 is arranged on the support device, and the telescopic probe 31 of the displacement sensor 3 is in contact with the circumferential wall of the bottom end of the nozzle base 1, the display 10 is arranged at the position adjacent to the top end of the nozzle base 1 of the top cover 2, and the displacement sensor 3 is electrically connected with the display 10.

[0028] When the top end of the nozzle base 1 passing through the first through hole 21 is welded with the top cover 2, the CRDM nozzle base welding position monitoring device of the embodiment can be used for monitoring the position of the nozzle base 1 relative to the axis of the top cover 2, so as to implement checking whether the position degree of the nozzle base 1 deviates. Specifically, the utility model discards the mode of monitoring the position degree of the bottom end of the nozzle base 1 by using a micrometer, but monitors whether the position degree of the bottom end of the nozzle base 1 deviates by using the displacement sensor 3, if the position of the monitored bottom end of the nozzle base 1 deviates, it indicates that the axis of the nozzle base 1 changes relative to the top cover 2, and then the welding sequence of the welder can be adjusted to correct the position degree of the nozzle base 1. After the telescopic probe 31 of the displacement sensor 3 monitors that the bottom end of the nozzle base 1 changes in position, the change information can be transmitted to the display 10, since the display 10 is located at the welding position adjacent to the top end of the nozzle base 1 of the top cover 2, the welder can check the change of the position degree of the nozzle base 1 during welding, finally the welding efficiency is ensured, and the position precision of the nozzle base 1 after being welded with the top cover 2 is ensured.

[0029] It should be noted that the first through hole 21 of the nozzle base 1 and the top cover 2 is in a transition fit relationship, which can ensure that the nozzle base 1 can be arranged in the first through hole 21, and also can ensure that the nozzle base 1 will not fall from the first through hole 21 before welding. If it is an interference fit, it will be difficult for the nozzle base 1 to be transferred into the first through hole 21 of the top cover 2; if it is a clearance fit, the nozzle base 1 will easily fall downward from the first through hole 21 before welding.

[0030] It should be noted that, as Figure 2As shown, before the top end outer peripheral wall of the pipe seat 1 is welded with the top cover 2, the position degree of the pipe seat 1 is accurate, and correspondingly, the position degree of the bottom end of the pipe seat 1 is also accurate. At this time, the telescopic probe 31 of the displacement sensor 3 is in contact with the outer peripheral wall of the bottom end of the pipe seat 1. At this time, the displacement sensor 3 monitors that the position degree of the bottom end of the pipe seat 1 can be zero and is displayed on the display 10. During the welding process, if the position of the bottom end of the pipe seat 1 changes, the telescopic probe 31 of the displacement sensor 3 will be extended or shortened, and then the monitored position change value will be reflected in real time on the display 10.

[0031] It should be noted that, Figure 1 As shown, the top cover 2 is not a complete top cover 2, but a part of the top cover 2. The complete top cover 2 is similar to a bowl-shaped structure with the bowl mouth upward, and the welder performs the welding operation in the top cover 2 of the bowl-shaped structure; the display 10 is arranged in the bowl-shaped structure and is adjacent to the position of the top end of the pipe seat 1.

[0032] Referring to Figure 1 Optionally, the displacement sensor 3 is provided with two telescopic probes 31, and the telescopic directions of the two telescopic probes 31 are perpendicular to each other. The telescopic direction of one of the telescopic probes 31 is parallel to the radial direction of the top cover 2, and the telescopic direction of the other telescopic probe 31 is parallel to the tangential direction of the top cover 2.

[0033] It should be noted that, whether the traditional change of the position degree of the bottom end of the pipe seat 1 is monitored by the dial gauge or the change of the position degree of the bottom end of the pipe seat 1 is monitored by the displacement sensor 3, it specifically refers to the change of the position of the center of the bottom end of the pipe seat 1 relative to the axis of the top cover 2. The change of the position of the center of the bottom end of the pipe seat 1 relative to the axis of the top cover 2 is specifically the change of the position of the center of the bottom end of the pipe seat 1 relative to the axis of the top cover 2 in the radial direction of the top cover 2 and in the direction parallel to the tangent direction of the top cover 2.

[0034] Based on this, in the case of monitoring the position degree of the bottom end of the pipe seat 1 by the displacement sensor, the displacement sensor 3 is provided with two telescopic probes 31, that is, the bottom end of one pipe seat 1 is monitored by two displacement sensors 3. The telescopic probe 31 of one displacement sensor 3 is parallel to the radial direction of the top cover 2. In this way, when the bottom end of the pipe seat 1 changes in position along the radial direction of the top cover 2, it is monitored by the displacement sensor 3. The telescopic probe 31 of the other displacement sensor 3 is parallel to the tangential direction (that is, the tangent direction) of the top cover 2. In this way, when the bottom end of the pipe seat 1 changes in position along the tangential direction of the top cover 2, it is monitored by the displacement sensor 3.

[0035] Referring to Figure 1 Optionally, the support device comprises a lifting mechanism 4 and a support structure 5, the support structure 5 is arranged at the top end of the lifting mechanism 4, and the displacement sensor 3 is arranged on the support structure 5.

[0036] In the embodiment, the displacement sensor 3 is arranged on the support structure 5, and the support structure 5 is arranged on the top end of the lifting mechanism 4, so that the height of the support structure 5 and the displacement sensor 3 can be brought to the required position by lifting the lifting mechanism 4.

[0037] Optionally, referring to Figure 1 , the support structure 5 comprises a sensor fixing member 52, a support plate 51 and a locking structure 53, the sensor fixing member 52 is used for fixing the displacement sensor 3, the sensor fixing member 52 is used for moving along the extension direction of the support plate 51, and the locking structure 53 is used for relatively fixing the sensor fixing member 52 and the support plate 51, wherein the moving direction of the sensor fixing member 52 is parallel to the extension direction of the telescopic probe 31 of the displacement sensor 3.

[0038] In the embodiment, the sensor fixing member 52 is used for fixing or loosening the displacement sensor 3, and the sensor fixing member 52 can move along the support plate 51 to drive the displacement sensor 3 to move in the extension direction of the telescopic probe 31, and when the displacement sensor 3 is moved to the position, the sensor fixing member 52 can be fixed on the support plate 51 by the locking structure 53.

[0039] It can be understood that before the pipe base 1 is inserted into the first through hole 21 of the top cover 2, the height of the lifting mechanism 4 can be lowered first, so that the height of the support plate 51, the sensor fixing member 52 and the locking structure 53 can be lowered, so as to ensure that the pipe base 1 is not hindered from being inserted into the first through hole 21 from bottom to top; after the pipe base 1 is transitionally fitted with the first through hole 21, the displacement sensor 3 can be driven away from the axis of the pipe base 1 by the sensor fixing member 52, then the height of the support plate 51, the sensor fixing member 52 and the locking structure 53 can be raised by the lifting mechanism 4 until the telescopic probe 31 of the displacement sensor 3 corresponds to the outer peripheral wall of the bottom end of the pipe base 1, and then the displacement sensor 3 can be driven to be close to the axis of the pipe base 1 by the sensor fixing member 52 until the telescopic probe 31 of the displacement sensor 3 contacts the outer peripheral wall of the pipe base 1.

[0040] Referring to Figures 2-5Optionally, the support plate 51 is provided with a sliding groove 511 extending along the length direction of the support plate 51, the sensor fixing member 52 comprises a horizontal plate 521 provided with a second through hole 5211, and the locking structure 53 comprises a screw rod base 531, a screw rod 532 and a locking nut 533 threadedly connected to the screw rod 532, the screw rod base 531 is located at the side of the support plate 51 away from the horizontal plate 521, the bottom end of the screw rod 532 is fixed to the screw rod base 531, the top end of the screw rod 532 is sequentially arranged in the sliding groove 511 and the second through hole 5211, and the locking nut 533 is located at the side of the horizontal plate 521 away from the support plate 51.

[0041] In the embodiment, the support plate 51 is provided with a sliding groove 511 extending along the length direction of the support plate 51, the sliding groove 511 is parallel to the telescopic probe 31 of the displacement sensor 3, the screw rod base 531 is located at the side of the support plate 51 away from the horizontal plate 521, for example, the screw rod base 531 is located at the lower side of the support plate 51, and the screw rod base 531 does not pass through the sliding groove 511, the sensor fixing member 52 is located at the upper side of the support plate 51, the screw rod base 531 is arranged in the sliding groove 511 and the second through hole 5211 of the horizontal plate 521, and the locking nut 533 is connected to the screw rod 532 and located at the upper side of the horizontal plate 521, so that when the sensor fixing member 52 drives the displacement sensor 3 to move to a position, the locking nut 533 can be screwed until the horizontal plate 521 is locked on the support plate 51.

[0042] Referring to Figures 2-5 Optionally, the sensor fixing member 52 further comprises a locking bolt 523 and a vertical plate 522 connected to the horizontal plate 521 perpendicularly, the vertical plate 522 is provided with a clamping hole 5221 corresponding to the pipe base 1 along the thickness direction of the vertical plate 522, the displacement sensor 3 is arranged in the clamping hole 5221, the vertical plate 522 is further provided with a notch slot 5222 in communication with the clamping hole 5221, the vertical plate 522 is further provided with a first bolt hole 5223 perpendicular to the thickness direction of the notch slot 5222, and the first bolt hole 5223 intersects the notch slot 5222, and the locking bolt 523 is connected to the first bolt hole 5223.

[0043] In this embodiment, before the displacement sensor 3 is fixed by the sensor fixing piece 52, the locking bolt is screwed out of the first bolt hole 5223 upwards until the bolt head of the locking bolt is separated from the top surface of the vertical plate 522, and then the displacement sensor 3 is inserted into the clamping hole 5221 of the vertical plate 522; then, the locking bolt is screwed down, and the bolt head of the locking bolt is pressed tightly against the top surface of the vertical plate 522; as the locking bolt continues to be screwed, the gap slot 5222 is pressed flat under the action of the bolt head. Since the gap slot 5222 is in communication with the clamping hole 5221, after the gap slot 5222 is pressed flat, the size of the clamping hole 5221 is also reduced, thereby achieving clamping and fixing of the displacement sensor 3. The locking bolt can be a butterfly bolt,

[0044] Referring to Figure 1 Optionally, the lifting mechanism 4 comprises a vertically arranged pipe sleeve 41, an inner pipe 42 and a top wire 43, the inner pipe 42 is inserted into the pipe sleeve 41, the pipe sleeve 41 is provided with a second bolt hole communicating the inner and outer walls thereof, a plurality of second bolt holes are arranged in sequence along the vertical direction of the pipe sleeve 41, and the top wire 43 is connected to the corresponding second bolt hole for fastening the inner pipe 42, wherein the support structure 5 is arranged at the top end of the inner pipe 42.

[0045] In this embodiment, the lifting mechanism 4 comprises a pipe sleeve 41 and an inner pipe 42, and the lifting of the height of the lifting mechanism 4 refers to the lifting of the inner pipe 42 relative to the pipe sleeve 41. Since the pipe sleeve 41 is provided with a plurality of second bolt holes in the vertical direction, when the inner pipe 42 is lifted to the required height, the inner pipe 42 can be simultaneously clamped and fixed by the top wires 43 at different heights of the second threaded holes, thereby ensuring the stability after height fixation.

[0046] Referring to Figure 1 Optionally, the support device further comprises a base structure 6, and the CRDM pipe seat welding position monitoring device further comprises a steel mat floor 7, the lifting mechanism 4 is arranged on the base structure 6, and the base structure 6 comprises a magnetic suction seat 61 for magnetic suction connection with the steel mat floor 7.

[0047] In this embodiment, the base structure 6 can be fixed on the steel mat floor 7 through the magnetic suction seat 61, the connection mode is simple, and the base structure 6 can be fixed at any position, which is high in flexibility.

[0048] Referring to Figure 1 Optionally, the base structure 6 further comprises an insulating pad 62, the magnetic suction seat 61 is arranged on the insulating pad 62, and the base structure 6 contacts the steel mat floor 7 through the insulating pad 62.

[0049] In the embodiment, the sleeve 41 and the inner tube 42 are square tubes, and the top cover 2 and the tube seat 1 are also made of conductive metal materials, in order to ensure insulation, the magnetic base and the steel pad floor 7 are insulated by the insulating pad 62, so as to ensure the safety of the nuclear reactor and prevent the displacement sensor 3 from short circuiting.

[0050] Referring to Figure 1 Optionally, the CRDM tube seat welding position monitoring device further comprises a transmitter 8, and the displacement sensor 3 is electrically connected with the display 10 through the transmitter 8.

[0051] In the embodiment, the high-precision contact type displacement sensor 3 is used to monitor the position change of the tube seat 1 in real time during the welding process, and the transmitter 8 plays the following roles in this process: after the displacement sensor 3 monitors the position change of the tube seat 1, corresponding electrical signals are generated, and the transmitter 8 converts the original sensor signals into standard electrical signals, such as 4-20 mA standard current signals. The transmitter 8 can amplify, filter and condition the sensor signals, so as to enhance the accuracy and stability of the signals, so that the signal quality transmitted from the sensor to the recorder is better. The transmitter 8 can also play a role in signal isolation, preventing interference in the process site from affecting the recorder. At the same time, power isolation can also be provided to protect the instrument equipment. The sensor and the display 10 can be far apart, and the transmitter 8 can convert the signals into a form more suitable for long-distance transmission. In summary, the transmitter 8 plays a role in signal conversion, conditioning and isolation protection in the monitoring system, ensuring the accuracy and reliability of signal transmission from the sensor to the display 10, and providing technical support for the welding operator to monitor the position change of the tube seat 1 in real time.

[0052] In addition, the displacement sensor 3, the transmitter and the display 10 can be connected through a shielded cable 9. The shielded cable 9 can effectively resist interference, suppress noise and provide safety protection, ensuring the accurate transmission of the displacement signal and providing reliable technical support for real-time monitoring of the position change of the tube seat 1.

[0053] The terms "first" and "second" are only used for descriptive purposes, 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" and "second" can explicitly or implicitly include at least one of the features.

[0054] Although the utility model discloses as above, the protection scope of the utility model is not limited to this. The person skilled in the art can make various changes and modifications without departing from the spirit and scope of the utility model, and these changes and modifications will all fall within the protection scope of the utility model.

Claims

1. A CRDM nozzle welding position monitoring device for monitoring the position of a nozzle (1) relative to the axis of a head (2) provided with a first through hole (21) for the nozzle (1) to pass through, characterized in that, The support device, displacement sensor (3) and display (10), the displacement sensor (3) is arranged on the support device, and the telescopic probe (31) of the displacement sensor (3) is in contact with the circumferential wall of the bottom end of the pipe base (1), and the display (10) is arranged at the position adjacent to the top end of the pipe base (1) of the top cover (2), and the displacement sensor (3) is electrically connected with the display (10).

2. The CRDM socket weld position monitoring device of claim 1, wherein, The displacement sensor (3) is provided with two, the telescopic direction of the telescopic probe (31) of the two displacement sensors (3) is perpendicular, wherein the telescopic direction of the telescopic probe (31) of one displacement sensor (3) is parallel to the radial direction of the top cover (2), and the telescopic direction of the telescopic probe (31) of the other displacement sensor (3) is parallel to the tangential direction of the top cover (2).

3. The CRDM socket weld position monitoring device of claim 1, wherein, The support device includes a lifting mechanism (4) and a support structure (5), the support structure (5) is arranged at the top end of the lifting mechanism (4), and the displacement sensor (3) is arranged on the support structure (5).

4. The CRDM socket weld position monitoring device of claim 3, wherein, The support structure (5) includes a sensor fixing part (52), a support plate (51) and a locking structure (53), the sensor fixing part (52) is used for fixing the displacement sensor (3), the sensor fixing part (52) is used for moving along the extension direction of the support plate (51), and the locking structure (53) is used for fixing the sensor fixing part (52) relative to the support plate (51), wherein the moving direction of the sensor fixing part (52) is parallel to the telescopic direction of the telescopic probe (31) of the displacement sensor (3).

5. The CRDM socket weld position monitoring device of claim 4, wherein, The support plate (51) is provided with a sliding groove (511) extending in the length direction, the sensor fixing part (52) includes a horizontal plate (521), the horizontal plate (521) is provided with a second through hole (5211), the locking structure (53) includes a screw rod seat (531), a screw rod (532) and a locking nut (533) screwed on the screw rod (532), the screw rod seat (531) is located on the side of the support plate (51) away from the horizontal plate (521), the bottom end of the screw rod (532) is fixed on the screw rod seat (531), the top end of the screw rod (532) is sequentially arranged in the sliding groove (511) and the second through hole (5211), and the locking nut (533) is located on the side of the horizontal plate (521) away from the support plate (51).

6. The CRDM socket weld position monitoring device of claim 5, wherein, The sensor fixing part (52) further comprises a locking bolt (523) and a vertical plate (522) vertically connected with the horizontal plate (521), the vertical plate (522) is provided with a clamping hole (5221) corresponding to the pipe seat (1) along the thickness direction of the plate, the displacement sensor (3) is arranged in the clamping hole (5221), the vertical plate (522) is further provided with a notch slot (5222) in communication with the clamping hole (5221), the vertical plate (522) is further provided with a first bolt hole (5223) perpendicular to the thickness direction of the notch slot (5222), and the first bolt hole (5223) intersects with the notch slot (5222), and the locking bolt (523) is connected in the first bolt hole (5223).

7. The CRDM socket weld position monitoring device of claim 3, wherein, The lifting mechanism (4) comprises a vertical pipe sleeve (41), an inner pipe (42) and a jackscrew (43), the inner pipe (42) is inserted into the pipe sleeve (41), the pipe sleeve (41) is provided with a second bolt hole communicating the inner and outer walls thereof, a plurality of second bolt holes are arranged in the vertical direction of the pipe sleeve (41) in sequence, and the jackscrew (43) is connected with the corresponding second bolt hole for fastening the inner pipe (42), wherein the support structure (5) is arranged at the top end of the inner pipe (42).

8. The CRDM socket weld position monitoring device of claim 3, wherein, The bracket device further comprises a base structure (6), and the CRDM pipe seat welding position monitoring device further comprises a steel mat floor (7), the lifting mechanism (4) is arranged on the base structure (6), and the base structure (6) comprises a magnetic suction seat (61) for being magnetically connected with the steel mat floor (7).

9. The CRDM socket weld position monitoring device of claim 8, wherein, The base structure (6) further comprises an insulating pad (62), the magnetic suction seat (61) is arranged on the insulating pad (62), and the base structure (6) is in contact with the steel mat floor (7) through the insulating pad (62).

10. The CRDM socket weld position monitoring device of claim 1, wherein, Further comprising a transmitter (8), and the displacement sensor (3) is electrically connected with the display (10) through the transmitter (8).

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