CN201935898U

CN201935898U - Ultrasonic automatic inspection device for penetrating pipe fitting of top cover of pressure vessel

Info

Publication number: CN201935898U
Application number: CN 201020644985
Authority: CN
Inventors: 蔡杰; 卢威; 陈光毅
Original assignee: Research Institute of Nuclear Power Operation; China Nuclear Power Operation Technology Corp Ltd
Current assignee: Research Institute of Nuclear Power Operation; China Nuclear Power Operation Technology Corp Ltd
Priority date: 2010-12-07
Filing date: 2010-12-07
Publication date: 2011-08-17
Anticipated expiration: 2020-12-07

Abstract

The utility model relates to a nondestructive safety detection technology for a pressure vessel of a reactor, and particularly discloses an ultrasonic automatic inspection device for a penetrating pipe fitting of a top cover of a pressure vessel. A lifting cylinder drives a frame and a lifting mechanism in the frame to synchronously lift and descend, the lifting mechanism is driven to drive a lifting shaft and a rotating shaft to lift and descend, and a rotating motor drives the rotating shaft to rotate, so that a probe can accurately and smoothly enter a penetrating piece to realize ultrasonic automatic inspection of the penetrating piece; an elastic seal ring bends downwards to be attached to the inner wall of a flared opening of the penetrating piece to statically seal water during work, so that a little of water in the penetrating piece leaks downwards; a water receiving disk is designed, so that the water leaked downwards from the flared opening is collected in the disk and is led out from a drainage port; due to the design of an elastic rubber ring, certain elastic buffer can be achieved to prevent the penetrating piece from being impacted when an upper pressing plate is contacted with the flared opening; and dynamic seal is formed by properly squeezing the O-shaped seal ring, upper water sealing felt, middle water sealing felt and lower water sealing felt so as to guarantee hermetical mounting of components.

Description

Pressure vessels top cover runs through the ultrasonic automatic checking device of pipe fitting

Technical field

The utility model belongs to the harmless safety detection technology of reactor pressure vessel, is specifically related to a kind of ultrasonic automatic checking device of pipe fitting that runs through.

Background technology

The nuclear power plant reactor pressure vessels top cover is the hemisphere of the about 157mm of wall thickness, the top up, as a mouth down the pot.Run through on top cover many pipe fittings are installed, be called for short penetration piece, its internal diameter is about Φ 70mm, wall thickness 17.5mm welds together by J type weld seam and top cover inwall in its underpart, constitutes main system pressure boundary, nuclear island one loop, the lower end is equipped with a trumpet-shaped guide piece, is called for short hydraucone.Top cover penetration piece inside holds the control rod of controlling reactor operation, also is simultaneously the passage of control rod operation.

Radiating medium will take place and leak if the penetrability crack in top cover of reactor pressure vessel penetration piece J type weld seam, and influences the normal operation of control rod drive mechanisms (CRD).According to the experience feedback of the multinational nuclear power station of Europe, the United States, must implement Ultrasonic Detection to J type weld seam, the penetrability crack appears with prevention.

Because top cover top and penetration piece outside have many fixed mechanisms to stop, can not implement Ultrasonic Detection in these positions.The top cover inwall was all implemented polishing, and surperficial utmost point out-of-flatness also is difficult to implement Ultrasonic Detection at the top cover inside surface.During the reactor shutdown, pressure vessels top cover is placed on 4 interior 1 meter high between isolation brace tables, and its inner radiation dosage is very high, forbids personnel to go into interior detection.These special circumstances require to use automatic checking device that top cover penetration piece J type weld seam is implemented automatic ultrasonic and detect.

Has only at present big detection company in the world, as French Fa Matong etc., can implement the automatic ultrasonic inspection to top cover of reactor pressure vessel penetration piece J type weld seam, but the operation easier of its equipment is big, and price is very high, can not directly apply to the automatic ultrasonic inspection of the top cover penetration piece of China's different size of the same type, bad adaptability is difficult to satisfy the requirement of China's nuclear power station to this detection.

In addition, the top cover penetration piece is implemented ultrasonic automatic detection, necessarily require to be coupled to realize that ultrasound wave is stable in the complete immersion water of detection probe, therefore require the water shutoff of automatic ultrasonic testing fixture to get well.

Summary of the invention

The purpose of this utility model is to provide a kind of can run through the ultrasonic automatic checking device of pipe fitting to the detection of pressure vessels top cover penetration piece enforcement automatic ultrasonic, simple to operate and pressure vessels top cover that be convenient to control, adaptability is good.

The technical solution of the utility model is as follows:

A kind of pressure vessels top cover runs through the ultrasonic automatic checking device of pipe fitting, and it comprises vehicle frame, and the vehicle frame both sides are provided with fixed block and guide rail, is provided with the guide wheel assembly in the guide rail; Described vehicle frame one side also is fixed with lift cylinder, and the piston rod of lift cylinder connects a crane, and this crane is fixed on the fixed block; The vehicle frame upper surface has circular hole, is provided with retaining ring at the circular hole place and places the elastic caoutchouc circle at upper surface; Be provided with the plug welded structure in the circular hole, described plug welded structure is a cylindrical shape, and tube is outer to be processed with the flange platform, and the flange decometer is on the elastic caoutchouc circle; Plug welded structure top is fixed with down laminated plank, elastic sealing gasket and last laminate; Be provided with lifting shaft in the plug welded structure, be provided with turning axle in the lifting shaft, turning axle passes down laminated plank, elastic sealing gasket and last laminate, and is stuck on the upper surface of lifting shaft; The turning axle top is fixed with probe; The lifting shaft lower end is provided with flange, and by the fixedly connected web joint of flange, turning axle passes the fixedly connected rotation meshing gear of flange; Rotation meshing gear and the rotary transmission gear engagement that fixedly is located on the web joint, this rotary transmission gear is driven by the electric rotating machine that is fixed on the web joint; The also fixedly connected elevating screw seat of described plug welded structure, the perforate of elevating screw seat upper surface, be provided with bearing in the hole, be provided with big helical pitch screw pair in the bearing, big helical pitch screw pair top suit lifting meshing gear, described lifting meshing gear and the lifting transmission gear engagement that is fixed with on the elevating screw seat, this lifting transmission gear is driven by the lifting motor that is fixed with on the elevating screw seat; Big helical pitch screw pair lower end is set with the feed screw nut, and this feed screw nut and web joint are fixed, and big helical pitch screw pair stretches out the feed screw nut, its bottom bearing set, and this Bearing Installation is in the bearing seat of fixing with elevating screw seat lower end.

The beneficial effects of the utility model are: drive crane and vehicle frame lifting by lift cylinder, elevating mechanism in the vehicle frame is synchronization lifting also, and drive lifting shaft and turning axle one lifting by driving elevating mechanism, rotate by electric rotating machine driven rotary axle self again, thereby make probe can accurately enter penetration piece smoothly, thereby can realize ultrasonic self-verifying penetration piece; By designing laminate, following laminated plank and elastic seal ring, when feasible probe enters penetration piece, elastic seal ring is curved down, be fitted in the hydraucone inwall of penetration piece, static water shutoff makes that the water in the penetration piece leaks down on a small quantity, and is fixedly mounting drip tray below the laminated plank down, make the water that leaks down from hydraucone collect in the dish, and derive from hydrophobic mouth; Further, make when going up laminate contact hydraucone, can access certain elastic buffer, avoid clashing into penetration piece by design flexibility rubber ring below below laminated plank down; Because O RunddichtringO, top water shutoff malthoid, middle part water shutoff malthoid and bottom water shutoff malthoid have been installed, by the appropriateness extruding, dynamic seal (packing) guarantees that the sealing between the parts is installed simultaneously.

Description of drawings

Fig. 1 runs through the ultrasonic automatic checking device one-piece construction of pipe fitting synoptic diagram for pressure vessels top cover of the present utility model;

Fig. 2 is the A-A cut-open view of Fig. 1;

Fig. 3 is the B-B cut-open view of Fig. 2;

Fig. 4 runs through the detection position synoptic diagram of the ultrasonic automatic checking device of pipe fitting for pressure vessels top cover;

Among the figure: 1. bearing seat; 2. web joint; 3. feed screw nut; 4. lifting shaft; 5. big helical pitch screw pair; 6. guide wheel assembly; 7. lifting motor; 8. elevating screw seat; 9. lifting transmission gear; 10. vehicle frame; 11. following laminated plank; 12. elastic sealing gasket; 13. last laminate; 14. guide rail; 15. probe unitized construction; 16. water pipe head; 17. drip tray; 18. hydrophobic ozzle; 19. lift cylinder; 20. crane; 21. electric rotating machine; 22. rotary transmission gear; 23. base plate; 24. rotation meshing gear; 25. turning axle; 26. sealing block; 27. probe pipeline; 28. bottom water shutoff malthoid; 29. middle part water shutoff malthoid; 30. plug welded structure; 31. retaining ring; 32. elastic caoutchouc circle; 33. fixed block; 34.O RunddichtringO; 35. top water shutoff malthoid; 36. wheel shaft; 37. lifting meshing gear; 38. back plate; 39. penetration piece; 40. pressure vessels top cover.

Embodiment

Below in conjunction with drawings and the specific embodiments the utility model is described in further detail.

As shown in Figure 1, fixing respectively welding fixed block 33 on the two side of vehicle frame 10, plate 38 after vehicle frame 10 rear sides are fixedly welded with, and on the plate 38 of back, the fixing respectively welding guide rail 14 in both sides of vehicle frame 10, guide wheel assembly 6 is installed respectively in the guide rail 14.

Described guide wheel assembly 6 has 4 groups, be separately installed with 2 groups in the guide rail 14 of vehicle frame 10 every sides, every group guide wheel assembly 6 all comprises 4 guide wheels, wherein the wheel shaft 36 of 2 guide wheels passes fixed block 33 symmetries and is fixed on the vehicle frame 10, wheel shaft 36 is vertical with the side surface of vehicle frame 10, the outer suit bearing of guide wheel, the contact both sides of the inwall of bearing and guide rail 14 can be rolled these 2 guide wheels at the madial wall of guide rail 14; Wheel shaft 36 symmetries of other 2 guide wheels are fixed on the both sides of guide rail 14 inwalls, and are placed in the groove of fixed block 33, and wheel shaft 36 is parallel with the side surface of vehicle frame 10, the outer suit bearing of guide wheel, and bearing contacts with the sidewall of vehicle frame 10.These 2 guide wheels can be rolled on the sidewall of vehicle frame 10.Therefore each guide wheel assembly has two groups of mutually orthogonal guide wheels, slides on track separately simultaneously.

Base plate 23 of fixing welding in vehicle frame 10 bottom surfaces, on base plate 23, lift cylinder 19 of a side of vehicle frame 10 fixed installation, the piston rod part of this cylinder 19 connects a crane 20 by screw retention, and this crane 20 is fixedlyed connected with the fixed block 33 of vehicle frame 10 1 sides of vicinity.

Have circular hole at vehicle frame 10 upper surfaces, hole placed around elastic caoutchouc circle 32, and by being fixedly mounted on retaining ring 31 on the vehicle frame 10 with rubber ring 32 location, plug welded structure 30 is passed the circular hole on the vehicle frame 10.This plug welded structure 30 is a cylindrical shape, and tube is outer to be processed with the flange platform, and the flange decometer is on elastic caoutchouc circle 32.Plug welded structure 30 tops are fixedly welded with down laminated plank 11, are covering one deck elastic sealing gasket 12 on the laminated plank 11 down, and then are covering laminate 13, and it is fixing to go up laminate 13, elastic sealing gasket 12 and following laminated plank 11 by screw again.In circular drip tray 17 of the fixing welding of following laminated plank 11 bottom margins, the edge perk of drip tray 17.The bottom of drip tray 17 has weep hole, and hydrophobic mouth 18 is installed in the hole.Described upward laminate 13 and following laminated plank 11 are discoid, and sidewall is a circular conical surface.The cone angle and the shape of last laminate 13 and following laminated plank 11 are identical, and following laminated plank 11 is slightly larger than laminate 13.Described elastic sealing gasket 12 is circular, and its diameter is greater than the diameter of following laminated plank 11.Laminate 13 on above-mentioned, the position of elastic sealing gasket 12 and following laminated plank 11 corresponding plug welded structure 30 cylinders all has coaxial hole, and lifting shaft 4 passes in the cylinder that this hole is arranged on plug welded structure 30, lifting shaft 4 also is columnar structured, its inside also is provided with and is similarly columnar turning axle 25, the upper surface of this turning axle 25 is processed with the flange platform, by the upper surface of flange decometer at

lifting shaft

4,15 be fixed on the flange platform of turning axle 25 upper surfaces and pop one's head in, perforate on turning

axle

25,15 all the probe pipelines 27 that have of popping one's head in are passed the hole of turning axle 25, be placed in the turning axle 25, and stretch out from turning axle 25 lower ends.

In addition, on the same vertical direction at the edge of last laminate 13, elastic sealing gasket 12 and following laminated plank 11, have leaking hole, water pipe head 16 is installed in the hole.This water pipe head 16 is positioned at the annulus of drip tray 17.

The bottom of lifting shaft 4 is fixed with flange, and turning axle 25 passes this flange cover packs in the rotation meshing gear 24, and fixedly connected, and by sealing block 26 lower port is sealed.And lifting shaft 4 also is fixedly mounted on the web joint 2 by its flange in the bottom.Also be installed with rotary transmission gear 22 on the web joint 2, it is driven by the electric rotating machine 21 that is fixed on the web joint 2.

Rotary transmission gear

22 and 24 engagements of rotation meshing gear, and 24 rotations of driven rotary meshing gear, thus energy driven rotary axle 25 is in lifting shaft 4 inner rotation.

As shown in Figure 1, the middle part of plug welded structure 30 is by the fixing welding of flange arrangement elevating screw seat 8, lifting transmission gear 9 is installed in the upper face top of elevating screw seat 8, and this lifting transmission gear 9 is driven by the lifting motor 7 that is fixedly mounted on elevating screw seat 8 upper faces below.

Fig. 2 and shown in Figure 3, the upper face top of elevating screw seat 8 also is equipped with lifting meshing gear 37, lifting meshing gear 37 is fixedlyed connected with big helical pitch screw pair 5, the big helical pitch screw pair 5 outer bearings that are installed in elevating screw seat 8 upper faces that are set with, and lifting meshing gear 37 is pushed down this bearing.Big helical pitch screw pair 5 bottoms are set with feed screw nut 3, and this feed screw nut 3 is fixed on the web joint 2.And big helical pitch screw pair 5 stretches out feed screw nut 3, its bottom bearing set, and the fixedly connected bearing seat 1 of the lower face of elevating screw seat 8 is in this Bearing Installation bearing seat 1.

In order to guarantee water-tight, between lifting shaft 4 tops and the following laminated plank 11 and between lifting shaft 4 tops and turning axle 25 tops top water shutoff malthoid 35 and O RunddichtringO 34 are being installed all; And water shutoff malthoid 29 in the middle part of between plug welded structure 30 and lifting shaft 4, having installed.Bottom water shutoff malthoid 28 has been installed between lifting shaft 4 flange in the bottom and turning axle 25.

During work, when lift cylinder 19 work drive the piston rod lifting at its top, drive crane 20 liftings, crane 20 drives vehicle frame 10 synchronization liftings again.Vehicle frame 10 drives 30 liftings of plug welded structure by elastic caoutchouc circle 32.Plug welded structure 30 drives the fixedly connected following laminated plank 11 in its top, elastic sealing gasket 12 and last laminate 13 synchronization liftings on the one hand, drives elevating screw seat 8 synchronization liftings that its underpart connects on the other hand again.Elevating screw seat 8 drives lifting motor 7 mounted thereto, lifting transmission gear 9, lifting meshing gear 37 and big helical pitch screw pair 5 liftings, big helical pitch screw pair 5 drives feed screw nuts 3, web joint 2, bearing seat 1 lifting, and this moment, web joint 2 also drove also synchronization lifting together of lifting shaft 4 and turning axle 25.

Lifting motor 7 work, driving lifting transmission gear 9 rotates, thereby lifting meshing gear 37 is rotated, lifting meshing gear 37 drives big helical pitch screw pair 5 rotations, big helical pitch screw pair 5 rotations drive feed screw nut's 3 liftings, feed screw nut's 3 take off and landing strip be dynamically connected plate 2, bearing seat 1, electric rotating machine 21, turning axle driven wheel 22 and lifting shaft 4 and turning axle 25 etc. are synchronization lifting together.

Electric rotating machine 21 work, by

rotary transmission gear

22 and 25 rotations of rotation meshing gear 24 driven in rotation axles, turning axle 25 drives probe 15 rotations.

Shown in Figure 4, the lower end of penetration piece 39 is installed on the pressure vessels top cover 40, its lower end is a hydraucone, pressure vessels top cover of the present invention runs through the ultrasonic automatic checking device of pipe fitting and is installed in penetration piece 39 belows, the operation automatic checking device makes laminate 13, elastic sealing gasket 12 and following laminated plank 11 hydraucone of shutoff penetration piece 39 lower ends together.Owing between vehicle frame 10 and the plug welded structure 30 elastic caoutchouc circle 32 is installed, when last laminate 13 contacts hydraucones, can plays the elastic buffer effect; Again because the elastic sealing gasket 12 between last laminate 13 and the following laminated plank 11; when elastic sealing gasket 12 stretches into hydraucone, bend downwards, also can play the elastic buffer effect from horizontality; therefore guarantee to go up laminate 13 flexible contact hydraucones, protect tested penetration piece 39.Last laminate 13 is dimensioned to and hydraucone size fit, and its circular conical surface just in time enters in the hydraucone, and fits like a glove with hydraucone inside.Elastic sealing gasket 12 tightly is attached on the hydraucone Lower Half inwall being bent to when being attached to down laminated plank 11 surfaces fully, can static water shutoff, a small amount of seepage only takes place.

Claims

1. a pressure vessels top cover runs through the ultrasonic automatic checking device of pipe fitting, it is characterized in that: it comprises vehicle frame (10), and vehicle frame (10) both sides are provided with fixed block (33) and guide rail (14), are provided with guide wheel assembly (6) in the guide rail (14); Described vehicle frame (10) one sides also are fixed with lift cylinder (19), and the piston rod of lift cylinder (19) connects a crane (20), and this crane (20) is fixed on the fixed block (33); Vehicle frame (10) upper surface has circular hole, is provided with retaining ring (31) at the circular hole place and places elastic caoutchouc circle (32) at upper surface; Be provided with plug welded structure (30) in the circular hole, described plug welded structure (30) is a cylindrical shape, and tube is outer to be processed with the flange platform, and the flange decometer is on elastic caoutchouc circle (32); Plug welded structure (30) top is fixed with down laminated plank (11), elastic sealing gasket (12) and last laminate (13); Be provided with lifting shaft (4) in the plug welded structure (30), be provided with turning axle (25) in the lifting shaft (4), turning axle (25) passes down laminated plank (11), elastic sealing gasket (12) and last laminate (13), and is stuck on the upper surface of lifting shaft (4); Turning axle (25) top is fixed with probe (15); Lifting shaft (4) lower end is provided with flange, and by the fixedly connected web joint of flange (2), turning axle (25) passes the fixedly connected rotation meshing gear of flange (24); Rotation meshing gear (24) and rotary transmission gear (22) engagement that fixedly is located on the web joint (2), this rotary transmission gear (22) is driven by the electric rotating machine (21) that is fixed on the web joint (2); The also fixedly connected elevating screw seat of described plug welded structure (30) (8), elevating screw seat (8) upper surface perforate, be provided with bearing in the hole, be provided with big helical pitch screw pair (5) in the bearing, big helical pitch screw pair (5) top suit lifting meshing gear (37), described lifting meshing gear (37) and lifting transmission gear (9) engagement that is fixed with on elevating screw seat (8), this lifting transmission gear (9) is driven by the lifting motor (7) that is fixed with on elevating screw seat (8); Big helical pitch screw pair (5) lower end is set with feed screw nut (3), this feed screw nut (3) is fixing with web joint (2), and big helical pitch screw pair (5) stretches out feed screw nut (3), its bottom bearing set, this Bearing Installation with the fixing bearing seat (1) in elevating screw seat (8) lower end in.

2. pressure vessels top cover as claimed in claim 1 runs through the ultrasonic automatic checking device of pipe fitting, it is characterized in that: be provided with top water shutoff malthoid (35) and O RunddichtringO (34) between described lifting shaft (4) and the following laminated plank (11); Be provided with middle part water shutoff malthoid (29) between described plug welded structure (30) and the lifting shaft (4); Be provided with bottom water shutoff malthoid (28) between described lifting shaft (4) flange in the bottom and the turning axle (25).

3. pressure vessels top cover as claimed in claim 1 or 2 runs through the ultrasonic automatic checking device of pipe fitting, it is characterized in that: the fixing welding of described laminated plank (a 11) bottom margin down circular drip tray (17), the bottom of drip tray (17) has weep hole, and hydrophobic mouth (18) is installed in the hole.

4. pressure vessels top cover as claimed in claim 1 or 2 runs through the ultrasonic automatic checking device of pipe fitting, it is characterized in that: described upward laminate (13) and following laminated plank (11) are the disk-like structure of circular cone type, its cone angle is identical, and following laminated plank (11) diameter is greater than last laminate (13); Described elastic sealing gasket (12) is circular, and its diameter is greater than the diameter of following laminated plank (11).

5. pressure vessels top cover as claimed in claim 1 or 2 runs through the ultrasonic automatic checking device of pipe fitting, it is characterized in that: the part that described turning axle (25) stretches out laminate (13) has the hole, the probe pipeline (27) that probe (15) has passes the hole of turning axle (25), be placed in the turning axle (25), and stretch out from turning axle (25) lower port.