CN114460170B - Eddy current detection device for U-shaped pipe - Google Patents

Abstract

The application relates to a vortex detection device for a U-shaped pipe, which comprises a detection table; the movable workbench is arranged on the detection platform in a sliding manner, a clamping assembly is arranged on the movable workbench and used for clamping and fixing the U-shaped pipe, and a detection probe and a cable connected with the detection probe are arranged at one end of the U-shaped pipe; the traction assembly is arranged at the other end of the U-shaped pipe and movably arranged on the movable workbench, the traction assembly comprises a traction rope and a traction connector connected with the traction rope, and the traction connector can penetrate through one end, close to the detection probe, of the U-shaped pipe and is detachably connected with the detection probe; the driving assembly is movably arranged on the detection table and used for driving the traction connector to move in the U-shaped pipeline. This application staff can realize the automated inspection to U type pipe, need not that the staff is manual wears to establish test probe and just can realize eddy current testing, convenient and fast more of testing process.

Description

Eddy current detection device for U-shaped pipe

Technical Field

The application relates to the technical field of nondestructive testing, in particular to a vortex detection device for a U-shaped pipe.

Background

The eddy current inspection is a nondestructive inspection method which mainly uses the electromagnetic induction remote principle to evaluate some performances of conductive materials and workpieces thereof in a nondestructive way or find defects by measuring the change of eddy current generated in the workpieces to be inspected.

Nondestructive testing faces various different workpieces to be tested, for example, detection of spiral pipes and U-shaped pipes, in the process of testing special-shaped pipes, a test probe needs to be arranged inside a pipeline in a penetrating manner, and in order to adapt to the specific shape of the special-shaped pipe, most of the test probes are arranged to be deformable structures such as a nuclear power station steam generator heat transfer pipe flexible eddy current test probe disclosed in CN102903407a, a nuclear power station neutron flux instrument finger sleeve pipe eddy current test special probe disclosed in CN103063740a, and the like.

But above-mentioned structure is at the in-process that detects, because test probe can deform, therefore test probe is difficult to wear to establish to U type pipeline in, and the inconvenient operation of testing process brings great difficulty for the operation of U type pipeline.

Disclosure of Invention

In order to carry out eddy current testing in wearing to establish to U type pipeline with test probe for the convenience, this application provides an eddy current testing device for U type pipe.

The application provides a vortex detection device for U type pipe adopts following technical scheme:

an eddy current testing device for a U-shaped pipe, comprising:

a detection table;

the movable workbench is arranged on the detection platform in a sliding manner, a clamping assembly is arranged on the movable workbench and used for clamping and fixing the U-shaped pipe, and a detection probe and a cable connected with the detection probe are arranged at one end of the U-shaped pipe;

the traction assembly is arranged at the other end of the U-shaped pipe and movably arranged on the movable workbench, the traction assembly comprises a traction rope and a traction connector connected with the traction rope, and the traction connector can penetrate through one end, close to the detection probe, of the U-shaped pipe and is detachably connected with the detection probe;

and the driving assembly is movably arranged on the detection platform and is used for driving the traction connector to move in the U-shaped pipeline.

Based on above-mentioned technical scheme, the U type pipe that the centre gripping subassembly can treat to detect plays the effect that the bearing supported, makes the U type pipe more steady at the in-process that detects. Drive assembly can drive automatically and pull the connector and remove in U type pipe, when pulling the connector and remove to the other end of U type pipe, the staff can link to each other with test probe pulling the connector, recycles the haulage rope pulling and pulls the connector, can make test probe remove in U type pipe automatically, realizes the automated inspection to U type pipe.

Preferably, be connected with the backup pad on detecting the platform, U type spout has been seted up in the backup pad, drive assembly includes:

the moving rod is arranged in the U-shaped sliding groove in a sliding mode and can slide along the length direction of the U-shaped sliding groove;

the driving block is fixedly connected to the moving rod, and an electromagnet is arranged in the moving block;

the traction connector is made of metal materials which can attract the electromagnet.

Based on above-mentioned technical scheme, the carriage release lever can remove in U type spout, because the big or small shape phase-match of U type spout and U type pipe, for the electro-magnet circular telegram in the drive block, can drive the in-process that the drive block removed at the carriage release lever and make the drive block drive and pull the connector and remove in U type pipe, consequently realize pulling the automatic movement of connector, more facility in the testing process.

Preferably, the rigid coupling has driving motor on the drive block, driving motor's output shaft rigid coupling has the driving gear, the driving gear meshing has driven gear, driven gear with the carriage release lever rotates to be connected, be provided with the tooth on one of them lateral wall of U type spout along length direction, driven gear with the tooth meshes mutually.

Based on above-mentioned technical scheme, start driving motor, driving motor drives the driving gear and rotates, and the driving gear rotates meshing driven gear and rotates for driven gear cooperatees with the tooth, thereby can let the carriage release lever walk in U type spout is automatic, and the drive pulls the connector and is walked certainly at U type intraductal.

Preferably, the number of the U-shaped sliding grooves is multiple, straight sections of the multiple U-shaped sliding grooves are parallel to each other, arc sections of the multiple U-shaped sliding grooves are concentric arcs, the supporting plate is further provided with a communicating groove, and the multiple U-shaped sliding grooves are communicated with the communicating groove, so that the moving rod can move from one of the U-shaped sliding grooves to any other U-shaped sliding groove through the communicating groove;

the last rotation of carriage release lever is connected with the guide wheel, U type spout with all seted up the guide way on the inner wall in intercommunication groove, the guide wheel with the cooperation of guide way joint.

Based on above-mentioned technical scheme, the setting of a plurality of U type spout and intercommunication groove can make the carriage release lever shift to in the U type spout of difference, can adjust drive assembly's position according to the specification size of U type pipe, adapts to the detection of the U type pipe of different specifications to at the in-process that the carriage release lever shifted, the guide wheel on the carriage release lever can cooperate with the guide way, guarantees the stationarity of carriage release lever removal in-process.

Preferably, a plurality of first cylinders are fixedly arranged on the supporting plate, each first cylinder is arranged opposite to one U-shaped sliding groove, the first cylinders are arranged at one ends, close to the communicating grooves, of the U-shaped sliding grooves, and a first transfer block is fixedly connected to the end portion of a piston rod of each first cylinder;

the movable rod is fixedly connected with a top plate, the top plate is positioned above the supporting plate, and the first transfer block is used for being connected with the top plate and driving the driving assembly to move between the U-shaped sliding groove and the communicating groove;

the supporting plate is fixedly provided with a second cylinder, a piston rod of the second cylinder faces the communicating groove, a second transfer block is fixedly connected to the end portion of a piston rod of the second cylinder and used for being connected with the top plate to drive the driving assembly to move along the length direction of the communicating groove.

Based on above-mentioned technical scheme, the first cylinder of a plurality of and first transfer piece can cooperate with the roof, make the carriage release lever move to the intercommunication groove or move to the U type spout in from the intercommunication groove from U type spout in, realize the automatic transfer of carriage release lever. The second cylinder and the second transfer block can be matched with the top plate, so that the moving rod can be transferred to different U-shaped sliding groove openings, the first cylinder and the second cylinder can be matched to enable the moving rod to be automatically moved and transferred, and the moving rod can be adapted to different U-shaped pipes, and therefore the detection is more convenient and rapid.

Preferably, the traction connecting head is connected with a plurality of elastic pieces in a floating mode, the elastic pieces are arc-shaped plates matched with the inner wall of the U-shaped pipe, balls are arranged on one side, facing the inner wall of the U-shaped pipe, of each elastic piece in a ball joint mode, and the balls are attached to the inner wall of the U-shaped pipe.

Based on above-mentioned technical scheme, when pulling the connector and removing in U type pipe, the ball on the flexure strip can laminate mutually with the inner wall of U type pipe, and the ball can reduce the frictional force between flexure strip and the pipeline inner wall, plays the effect of support to pulling the connector when pulling the connector and removing to when pulling the connector and being connected with test probe, can make test probe be located the axis position department of U type pipe, improve the precision of detection.

Preferably, the traction connector is provided with an insertion groove, the elastic sheet is connected with an insertion rod, the insertion rod is matched with the insertion groove in a sliding clamping manner, a floating spring is arranged in the insertion groove, one end of the floating spring is fixedly connected with the inner wall of the insertion groove, and the other end of the floating spring is fixedly connected with the insertion rod.

Based on above-mentioned technical scheme, floating spring can provide certain holding power and elastic action for peg graft pole and flexure strip, can follow the diameter and the shape change of U type pipe at the in-process that pulls the connector removal, and the U type intraductal wall of laminating more makes the testing process more steady.

Preferably, the two ends of the U-shaped pipeline are provided with winding assemblies, each winding assembly comprises a connecting support plate connected with the movable workbench in a sliding manner, a driving motor fixedly connected with the connecting support plate and a winding wheel rotatably connected to the connecting support plate, the driving motor is used for driving the winding wheels to rotate, the traction rope is wound on one of the winding wheels, and the cable is wound on the other winding wheel.

Based on above-mentioned technical scheme, the position of connecting the extension board and setting up that the mobile workbench slides and is connected can be according to the whole coiling subassembly of position alignment of U type pipe, when drawing connector and test probe and being connected, can start driving motor, make driving motor drive the coiling wheel and rotate, wherein the coiling wheel rotates and makes the haulage rope rolling, another coiling wheel rotates and makes the cable unreel, can draw test probe to remove in U type pipe automatically, can realize the automated inspection to U type pipe, the testing process is more steady, eddy current detection's detection precision has also been improved.

Preferably, the clamping assembly comprises a bidirectional clamping cylinder connected with the movable workbench in a sliding mode and clamping arms connected with piston rods at two ends of the bidirectional clamping cylinder, and arc-shaped clamping plates are connected to the clamping arms and used for clamping and limiting the U-shaped pipe.

Based on above-mentioned technical scheme, the effect of centre gripping can be played to U type pipe to the setting of centre gripping subassembly, carries out the testing process at U type pipe, can guarantee the detection precision to U type pipe.

In summary, the present application includes at least one of the following beneficial technical effects:

1. the traction connector is penetrated to one end of the U-shaped pipe by a worker, the traction connector is driven by the driving assembly to move in the U-shaped pipe, the traction connector is made to move to the other end of the U-shaped pipe and then is connected with the detection probe, after the traction connector is connected with the detection probe, the traction rope is pulled, the traction rope drives the traction connector to move, so that the detection probe moves in the U-shaped pipe, automatic detection of the U-shaped pipe can be achieved, eddy current detection can be achieved without the need of the worker for manually penetrating the detection probe, and the detection process is more convenient and rapid;

2. the U-shaped chutes are formed in the supporting plate, and the communicating grooves are formed in the supporting plate, so that the driving assembly can move from one of the U-shaped chutes to any one of the other U-shaped chutes, the detection of U-shaped pipes with different specifications can be adapted, the automatic transfer of the driving assembly can be realized by the first air cylinder and the second air cylinder arranged on the supporting plate, the automatic control is realized in the transfer process, and the detection process is more intelligent;

3. the elastic sheet of floating connection on the traction connector can make the traction connector be located at the axis position of the U-shaped pipe, and the traction connector drives the detection probe to move in the process, so that the detection probe is approximately located at the middle position of the U-shaped pipe, and the detection is more accurate.

Drawings

Fig. 1 is a schematic view of the overall structure of an eddy current testing apparatus.

Fig. 2 is a detailed structural diagram of the moving table portion.

Fig. 3 is an enlarged schematic view of a portion a of fig. 2.

Fig. 4 is an enlarged schematic view of the structure of part B in fig. 2.

Fig. 5 is a schematic sectional structure view of the towing connector.

Fig. 6 is a detailed structural view of the support plate portion.

Fig. 7 is a schematic view of a portion of the structure in the support plate.

Fig. 8 is an enlarged schematic view of the structure of the portion C in fig. 7.

Fig. 9 is a structural schematic diagram of the support plate from different viewing angles.

Fig. 10 is an enlarged schematic view of the structure of portion D in fig. 9.

Description of reference numerals: 1. a detection table; 2. moving the working table; 3. a traction assembly; 31. a hauling rope; 32. a traction connector; 321. an elastic sheet; 322. a ball bearing; 323. a plug-in rod; 324. a floating spring; 4. a drive assembly; 41. a travel bar; 411. a top plate; 42. a drive block; 43. a drive motor; 44. a driving gear; 45. a driven gear; 46. teeth; 47. a guide wheel; 5. a clamping assembly; 51. a bidirectional clamping cylinder; 52. a clamp arm; 53. an arc-shaped splint; 6. detecting a probe; 7. a cable; 8. a support plate; 81. a U-shaped chute; 82. a communicating groove; 9. a guide groove; 10. a first cylinder; 101. a first transfer block; 11. a second cylinder; 111. a second transfer block; 12. a winding assembly; 121. connecting the support plate; 122. a drive motor; 123. a winding wheel; 13. a U-shaped pipe.

Detailed Description

The present application is described in further detail below with reference to figures 1-8.

The embodiment of the application discloses a vortex detection device for a U-shaped pipe. Referring to fig. 1, the eddy current testing apparatus includes a testing table 1 and a movable worktable 2 disposed on the testing table 1, and the testing table 1 may be a movable testing table 1 or may be fixed on a specific testing station. The detection table 1 is provided with an electric guide rail, the movable workbench 2 is connected to the horizontal plane of the detection table 1 in a sliding mode through the electric guide rail, and the U-shaped pipe 13 is placed on the movable workbench 2 in the detection process. Be provided with clamping component 5 on the travelling table 2, clamping component 5 can play support and clamping action to U type pipe 13, guarantees the stability in the testing process.

Referring to fig. 2 and 3, the clamping assembly 5 includes a bidirectional clamping cylinder 51 slidably disposed on the movable table 2, a clamping arm 52 fixedly connected to a piston rod of the bidirectional clamping cylinder 51, and an arc-shaped clamp plate 53 fixedly connected to the clamping arm 52, and each bidirectional clamping cylinder 51 has two piston rods disposed opposite to each other, that is, the clamping arm 52 and the arc-shaped clamp plate 53 are both provided with two corresponding rods.

Referring to fig. 3, the sliding direction of the bidirectional clamp cylinder 51 is arranged along the radial direction of the U-shaped pipe 13, and the position of the bidirectional clamp cylinder 51 can be adjusted according to the specification and size of the U-shaped pipe 13. The opposite side of the arc-shaped clamping plate 53 can be connected with a protective sheet, so that the U-shaped pipe 13 is not scratched in the clamping process.

Referring to fig. 2 and 4, two groups of winding assemblies 12 are arranged on the movable workbench 2 corresponding to two ends of the U-shaped pipe 13, wherein one group of winding assemblies 12 is provided with a traction assembly 3, and the other group of traction assembly 3 is correspondingly provided with a detection probe 6.

Referring to fig. 2, the winding assembly 12 includes a connecting support plate 121 slidably connected to the movable table 2, a driving motor 122 fixedly connected to the connecting support plate 121, and a winding wheel 123 fixedly connected to an output end of the driving motor 122, the connecting support plate 121 is slidably disposed along a radial direction of the U-shaped tube 13, and the winding wheel 123 is rotatably connected to the connecting support plate 121.

Referring to fig. 2 and 4, the detection probe 6 is a deformable probe, and can be deformed in the U-shaped pipe 13 to adapt to the specific shape of the U-shaped pipe 13, thereby performing smooth detection. One end of the detection probe 6 is connected with a cable 7, and the cable 7 is wound on one winding wheel 123.

Referring to fig. 2 and 4, the pulling assembly 3 comprises a pulling rope 31 wound around the other winding roller and a pulling connector 32 fixedly connected with the pulling rope 31, wherein the pulling connector 32 can penetrate into one end of the U-shaped pipe 13 and penetrate out from the other end.

The traction connector 32 is detachably connected with the detection probe 6. Specifically, the traction connector 32 may be connected to the detecting probe 6 through a thread or a magnetic connection, or may be connected to the detecting probe through a locking member, such as a hoop or a locking bolt, and only the traction connector 32 needs to be connected to the detecting probe 6 and can be detached. In this embodiment, a magnetic connection is specifically adopted, so that the pulling connector 32 is connected to the detecting probe 6.

Referring to fig. 4 and 5, an insertion groove is formed in the traction connector 32, an insertion rod 323 is slidably connected in the insertion groove, a floating spring 324 is arranged in the insertion groove, one end of the floating spring 324 is fixedly connected with the bottom wall of the insertion groove, and the other end of the floating spring is fixedly connected with one end of the insertion rod 323. The other end rigid coupling of grafting pole 323 has flexure strip 321, and flexure strip 321 is the foil to flexure strip 321 sets up to the arcuation, can enough laminate mutually with the inner wall of U type pipe 13, also can take place deformation.

Referring to fig. 4 and 5, a ball 322 is ball-mounted at an end of the elastic sheet 321 away from the insertion rod 323, and when the traction connector 32 travels in the U-shaped pipe 13, the ball 322 can be attached to the inner wall of the U-shaped pipe 13, so that the traction connector 32 is located at a center position of the U-shaped pipe 13 in the radial direction. When the pulling connection head 32 is connected to the sensing probe 6, the sensing probe 6 is also positioned at the center position of the U-shaped tube 13 in the radial direction.

Referring to fig. 1 and 2, the detection table 1 is provided with a driving assembly 4, when detecting, a worker wears the traction connector 32 to one end of the U-shaped pipe 13, and drives the traction connector 32 to move in the U-shaped pipe 13 by using the driving assembly 4, and the traction connector 32 can be moved to the other end of the U-shaped pipe 13. The staff will pull connector 32 and be connected with test probe 6, two driving motor 122 of restart, the winding roller rolling that corresponds with haulage rope 31 unreels with the winding roller that cable 7 corresponds, pulls connector 32 and can drive test probe 6 and remove in U type pipe 13, realizes the eddy current detection to U type pipe 13.

Referring to fig. 1 and 6, a supporting plate 8 is connected to the detection table 1 in a sliding manner along the vertical direction, the supporting plate 8 is connected to the detection table 1 through an electric guide rail, a U-shaped chute 81 is formed in the supporting plate 8, and the opening direction of the U-shaped chute 81 is the same as the opening direction of the U-shaped pipe 13. The U-shaped sliding grooves 81 are provided with a plurality of U-shaped sliding grooves 81, the U-shaped sliding grooves 81 are parallel to each other, namely, the vertical sections of the U-shaped sliding grooves 81 are parallel to each other, the arc sections of the U-shaped sliding grooves 81 are arranged in a concentric circle shape, and three U-shaped sliding grooves 81 are provided in the embodiment.

Referring to fig. 7 and 8, the driving assembly 4 includes teeth 46 fixedly coupled to an inner wall of one side of the U-shaped chute 81, a moving rod 41 slidably disposed in the U-shaped chute 81, and a driven gear 45 rotatably coupled to the moving rod 41, the driven gear 45 being engaged with the teeth 46. The top plate 411 is fixed on the upper end of the moving rod 41, the driving block 42 is fixed on the lower end of the moving rod 41, the driving motor 43 is fixedly connected on the driving block 42, the driving gear 44 is fixed on the output end of the driving motor 43, and the driving gear 44 is meshed with the driven gear 45.

Start driving motor 43, driving motor 43 drives driving gear 44 and rotates, driving gear 44 rotates the in-process and drives 45 groups of driven gear and rotate, driven gear 45 can walk in U type chute when rotating, thereby drive carriage release lever 41 and remove in U type chute 81, be provided with the electro-magnet in the driving block 42, it sets up to the metal material that can be attracted by the electro-magnet to pull connector 32, driving block 42 is when removing along U type chute 81, start the electro-magnet, thereby can attract and drive and pull connector 32 and walk in U type pipe 13, wear to establish automatically and pull connector 32.

In order to accommodate U-shaped tubes 13 of different sizes, the driving assembly 4 can be moved into different U-shaped chutes 81. The communication groove 82 is formed in the support plate 8, the communication groove 82 is communicated with the plurality of U-shaped grooves, the moving rod 41 can move in different U-shaped grooves through the communication groove 82, and the detection of U-shaped pipes 13 of different specifications can be adapted.

Referring to fig. 9 and 10, a plurality of first cylinders 10 are fixedly connected to the support plate 8, the first cylinders 10 are disposed at one side of the communication groove 82, the number of the first cylinders 10 is the same as that of the U-shaped sliding grooves 81, the extending direction of the piston rods of the first cylinders 10 is the same as the axial direction of the vertical section of the U-shaped sliding grooves 81, and a first transfer block 101 is fixedly connected to the end of the piston rod of the first cylinder 10. The first transfer block 101 may be connected to the top plate 411, and may drive the moving rod 41 to move from the U-shaped groove into the communicating groove 82 or drive the moving rod 41 to move from the communicating groove 82 into the U-shaped groove in cooperation with the top plate 411.

Referring to fig. 9 and 10, the supporting plate 8 is further fixedly connected with a second cylinder 11, the extending direction of a piston rod of the second cylinder 11 is the same as the axial direction of the communicating groove 82, a second transfer block 111 is fixedly connected to the end of the piston rod of the second cylinder 11, the second transfer block 111 can also be connected with the top plate 411, and the top plate 411 can be driven to move in the axial direction of the communicating groove 82, so that the moving rod 41 can be transferred to different port positions of the U-shaped sliding groove 81. The second cylinder 11 cooperates with the first cylinder 10 to displace the movable rod 41 in the different U-shaped chutes 81.

The first transfer block 101 and the second transfer block 111 may be configured as electromagnets, the top plate 411 is configured as a metal material magnetically attracted to the electromagnets, and the first transfer block 101 and the second transfer block 111 may be connected to the top plate 411 when being powered on, so as to drive the top plate 411 to move on the support plate 8. Similarly, the first transfer block 101 and the second transfer block 111 may be connected to the top plate 411 by air pressure or by a clamp, as long as the connection and disconnection functions can be simultaneously achieved.

Referring to fig. 8 and 10, the moving rod 41 is rotatably connected with a guide wheel 47, the inner walls of the u-shaped sliding groove 81 and the communicating groove 82 are provided with mutually communicated guide grooves 9, the guide wheel 47 is in clamping fit with the guide grooves 9, and the moving rod 41 plays a role in guiding and limiting in the moving process, so that the moving rod 41 drives the driving block 42 to move more stably.

The specific implementation principle of this embodiment is as follows: the staff will wait to detect the U type pipe 13 and place between arc splint 53, start two-way centre gripping cylinder 51, make two-way centre gripping cylinder 51 drive arc splint 53 and remove, press from both sides U type pipe 13 tightly, can adjust the position of two-way centre gripping cylinder 51 according to the specification size of U type pipe 13.

The position of the winding assemblies 12 is adjusted such that one of the two winding assemblies 12 is located at one end of the U-tube 13 and the other winding assembly is located at the other end of the U-tube 13. The worker places the traction connector 32 at one end of the U-shaped pipe 13, and the movable workbench 2 slides to the position below the support plate 8.

The positions of the moving rod 41 and the driving block 42 are adjusted according to the position of the U-shaped pipe 13, and the adjusting process is firstly matched with the top plate 411 by the first air cylinder 10 and the first transfer block 101, so that the top plate 411, the moving rod 41, the guide wheel 47 and the like are pulled into the communication groove 82. The second cylinder 11 and the second transfer block 111 are matched with the top plate 411, so that the top plate 411, the moving rod 41, the guide wheel 47 and the like are moved to different U-shaped groove opening positions. And then the corresponding first cylinder 10 is driven, so that the first cylinder 10 pushes the moving rod 41 to move into a specific U-shaped groove, and the transfer of the driving structure is realized.

The electromagnet in the driving block 42 is energized, and at the same time, the driving motor 43 is started, the driving motor 43 drives the driving gear 44 to rotate, the driving gear 44 is meshed with the driven gear 45, so that the driven gear 45 rotates on the moving rod 41, and under the matching action of the driven gear 45 and the teeth 46, the moving rod 41 can move along the length direction of the U-shaped chute 81. The driving block 42 can drive the pulling connector 32 to move to the other end of the U-shaped pipe 13.

The staff will pull connector 32 and be connected with test probe 6, start two sets of coiling subassemblies 12, make around the take-up reel 123 rolling that is equipped with haulage rope 31, unreel around the take-up reel 123 that is equipped with cable 7, can utilize to pull connector 32 and drive test probe 6 and remove in U type pipe 13, and smooth realization is to the detection of U type pipe 13.

The above embodiments are preferred embodiments of the present application, and the protection scope of the present application is not limited by the above embodiments, so: all equivalent changes made according to the structure, shape and principle of the present application shall be covered by the protection scope of the present application.

Claims (6)

1. An eddy current testing device for a U-shaped pipe, comprising:

a detection table (1);

the movable workbench (2) is arranged on the detection platform (1) in a sliding mode, a clamping assembly (5) is arranged on the movable workbench (2), the clamping assembly (5) is used for clamping and fixing the U-shaped pipe (13), and a detection probe (6) and a cable (7) connected with the detection probe (6) are arranged at one end of the U-shaped pipe (13);

the traction assembly (3) is arranged at the other end of the U-shaped pipe (13) and movably arranged on the movable workbench (2), the traction assembly (3) comprises a traction rope (31) and a traction connector (32) connected with the traction rope (31), and the traction connector (32) can penetrate through one end, close to the detection probe (6), of the U-shaped pipe (13) and is detachably connected with the detection probe (6);

the driving assembly (4) is movably arranged on the detection table (1), and the driving assembly (4) is used for driving the traction connector (32) to move in the U-shaped pipe (13);

examine and be connected with backup pad (8) on platform (1), U type spout (81) have been seted up on backup pad (8), drive assembly (4) include:

the moving rod (41) is arranged in the U-shaped sliding groove (81) in a sliding mode, and the moving rod (41) can slide along the length direction of the U-shaped sliding groove (81);

the driving block (42) is fixedly connected to the moving rod (41), and an electromagnet is arranged in the driving block (42);

the traction connector (32) is made of metal materials which can attract the electromagnet;

the U-shaped sliding grooves (81) are provided with a plurality of straight sections which are parallel to each other, arc sections of the U-shaped sliding grooves (81) are concentric arcs, the supporting plate (8) is further provided with a communicating groove (82), and the U-shaped sliding grooves (81) are communicated with the communicating groove (82), so that the moving rod (41) can move from one U-shaped sliding groove (81) to any other U-shaped sliding groove (81) through the communicating groove (82);

the movable rod (41) is rotatably connected with a guide wheel (47), guide grooves (9) are formed in the inner walls of the U-shaped sliding groove (81) and the communication groove (82), and the guide wheel (47) is in clamping fit with the guide grooves (9);

a plurality of first cylinders (10) are fixedly arranged on the supporting plate (8), each first cylinder (10) is arranged opposite to one U-shaped sliding groove (81), the first cylinders (10) are arranged at one ends, close to the communicating grooves (82), of the U-shaped sliding grooves (81), and a first transfer block (101) is fixedly connected to the end portion of a piston rod of each first cylinder (10);

a top plate (411) is fixedly connected to the moving rod (41), the top plate (411) is located above the supporting plate (8), and the first transfer block (101) is connected with the top plate (411) and drives the driving assembly (4) to move between the U-shaped sliding groove (81) and the communicating groove (82);

fixed second cylinder (11) that is provided with on backup pad (8), the piston rod orientation of second cylinder (11) intercommunication groove (82) set up, just the tailpiece of the piston rod portion rigid coupling of second cylinder (11) has second to shift piece (111), second shift piece (111) be used for with roof (411) are connected, drive assembly (4) are followed the length direction of intercommunication groove (82) removes.

2. The eddy current inspection device for the U-shaped pipe according to claim 1, wherein: the rigid coupling has driving motor (43) on drive block (42), the output shaft rigid coupling of driving motor (43) has driving gear (44), driving gear (44) meshing has driven gear (45), driven gear (45) with carriage release lever (41) rotate and are connected, U type spout (81) are provided with tooth (46) on one of them lateral wall along length direction, driven gear (45) with tooth (46) mesh mutually.

3. The eddy current inspection device for the U-shaped pipe according to claim 1, wherein: draw connector (32) floating connection to have a plurality of flexure strips (321), flexure strip (321) set up to the arc with U type pipe (13) inner wall matched with, flexure strip (321) orientation one side ball joint of U type pipe (13) inner wall has ball (322), ball (322) with U type pipe (13) inner wall is laminated mutually.

4. The eddy current inspection device for the U-shaped pipe according to claim 3, wherein: the traction connector (32) is provided with a plug-in groove, the elastic sheet (321) is connected with a plug-in rod (323), the plug-in rod (323) is in sliding clamping fit with the plug-in groove, a floating spring (324) is arranged in the plug-in groove, one end of the floating spring (324) is fixedly connected with the inner wall of the plug-in groove, and the other end of the floating spring is fixedly connected with the plug-in rod (323).

5. The eddy current inspection device for the U-shaped pipe according to claim 1, wherein: both ends of U type pipe (13) way all are provided with winding assembly (12), winding assembly (12) including with mobile workbench (2) slide connection board (121), with connecting support board (121) rigid coupling driving motor (122) and rotate the connection and be connected winding wheel (123) on connecting support board (121), driving motor (122) are used for driving winding wheel (123) to rotate, haulage rope (31) are around establishing one of them on winding wheel (123), cable (7) are around establishing another on winding wheel (123).

6. The eddy current inspection device for the U-shaped pipe according to claim 1, wherein: the clamping assembly (5) comprises a bidirectional clamping cylinder (51) connected with the movable workbench (2) in a sliding mode and clamping arms (52) connected with piston rods at two ends of the bidirectional clamping cylinder (51), arc-shaped clamping plates (53) are connected to the clamping arms (52), and the arc-shaped clamping plates (53) are used for limiting the U-shaped pipes (13) in a clamping mode.

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