Ultrasonic flaw detection device and flaw detection method for steel structure welding

Abstract

The invention discloses an ultrasonic flaw detection device for steel structure welding and a flaw detection method, and relates to the technical field of ultrasonic flaw detection. The ultrasonic flaw detection device for steel structure welding comprises a test bed, and a limiting module, a rotary supporting module, a transverse moving supporting module and a flaw detection module are arranged on the top surface of the test bed. The first driving wheel can drive the tested steel member to rotate. The second driving wheel can drive the tested steel member to move transversely until a column end plate, far away from the tested end, of the tested steel member abuts against the limiting module in the lateral direction. According to the invention, automatic transverse movement positioning and rotary ultrasonic flaw detection can be carried out on the transversely-arranged detected steel member, and compared with pure manual operation, the detection precision is higher; the limiting module is used for transversely abutting against the column end plate away from the detected end, overall limiting of the detected steel component is achieved, the back face of the detected column end plate does not need to be provided with an abutting structure, and therefore the problem that ultrasonic waves are conducted to the abutting structure is avoided.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of ultrasonic flaw detection, in particular to an ultrasonic flaw detection device and method for steel structure welding. BACKGROUND

[0002] Earthquake disasters pose a serious threat to building safety; when the seismic fortification intensity reaches 9 degrees, it belongs to a high-risk area of earthquake. Bolts and welding are commonly used in steel structure buildings to connect components, and the welding quality directly affects the seismic capacity of the building. The position of the weld is usually detected by ultrasonic flaw detection technology to evaluate the welding quality.

[0003] The cylindrical steel component usually includes a component column and two column end plates, and the two column end plates are respectively welded and fixed at the two end face positions of the component column. The column end plate edge position is provided with a mounting hole, which is usually used for the connection between the cylindrical steel component and the surrounding component.

[0004] Water immersion ultrasonic flaw detection requires the weld to be completely immersed in water, and the cylindrical steel component has a large volume and a long diameter ratio, making it difficult to stand upright and abut against the ultrasonic flaw detection equipment in water; therefore, in the traditional technology, the cylindrical steel component is usually kept in a horizontal state, and a handheld ultrasonic flaw detector is used for flaw detection, but this method completely relies on manual operation and has a large error. SUMMARY

[0005] In order to overcome the problem of "difficulty in automatic detection of horizontally placed cylindrical steel components" in the background art, the present application provides an ultrasonic flaw detection device and method for steel structure welding.

[0006] The technical solution adopted by the present application to solve the above technical problems is: An ultrasonic flaw detection device and method for steel structure welding, comprising a test bed, the top surface of the test bed is provided with a limiting module at both ends, and a rotating support module and a transverse movement support module are arranged at the middle of the top surface of the test bed; a flaw detection module is arranged at both ends of the top surface of the test bed; the rotating support module comprises a first drive wheel, which can support the component column of the measured steel component and drive the measured steel component to rotate; the transverse movement support module comprises a second drive wheel; the second drive wheel can support the component column and drive the measured steel component to move horizontally, so that the column end plate away from the measured end of the measured steel component abuts against the side of the limiting module; the flaw detection module close to the measured end can move horizontally until it abuts against the side of the column end plate close to the measured end.

[0007] As a further optimization scheme of the present application, the second drive wheel can be lifted and lowered, so that the component column can be selectively pressed on the first drive wheel or the second drive wheel.

[0008] As a further optimization scheme of the present application, the flaw detection module can move laterally to the inside of the limiting module to avoid the column end plate from hitting the flaw detection module when the measured steel member is hoisted.

[0009] As a further optimization scheme of the present application, the limiting module comprises an inner support column and a lateral support ring which is sleeved on the outer periphery of the inner support column and can rotate laterally; the outer lateral wall of the lateral support ring can abut against the inner lateral wall of the column end plate away from the measured end.

[0010] As a further optimization scheme of the present application, the limiting module further comprises a cap which is buckled on the top end of the inner support column and can rotate; the cap is located above the lateral support ring and is coaxially arranged, the maximum radius of the outer lateral wall of the cap is greater than the outer radius of the lateral support ring; a clearance plane is arranged on the outer lateral wall of the cap; when the measured steel member is hoisted, the clearance plane is located on the side of the cap close to the rotary support module; when the measured steel member is pressed on the rotary support module or the lateral moving support module, the clearance plane is located on the side of the cap away from the rotary support module.

[0011] As a further optimization scheme of the present application, the vertical distance between the axis of the cap and the clearance plane is less than the maximum radius of the outer lateral wall of the cap.

[0012] As a further optimization scheme of the present application, the inner support column is a hollow structure, the inner cavity of the inner support column is provided with a second motor and a transmission vertical rod, the top end of the transmission vertical rod is connected with the axis of the cap, and the bottom end is connected with the output shaft of the second motor.

[0013] As a further optimization scheme of the present application, the flaw detection module comprises a lateral moving vertical column and an ultrasonic probe arranged laterally on the lateral moving vertical column, the bottom end of the ultrasonic probe is provided with a downward extending part; the top surface of the test bench is provided with a water storage shell which can be lifted, the water storage shell is provided with a coupling agent; when the ultrasonic probe is pressed on the column end plate, the water storage shell can be lifted to immerse the downward extending part in the coupling agent, so that the coupling agent between the downward extending part and the column end plate flows into the ultrasonic probe and the column end plate under the capillary action.

[0014] As a further optimization scheme of the present application, the top surface of the test bench is provided with a containing groove for containing the water storage shell, the containing groove is provided with a second linear driver, the top end of the second linear driver is connected with the water storage shell, and the bottom end is inserted and fixed in the test bench.

[0015] The application discloses a steel structure welding ultrasonic flaw detection method, and relates to the technical field of steel structure welding ultrasonic flaw detection devices.

[0016] To sum up, the application has at least one of the following advantages: (1) The application can automatically position and rotate the steel member for ultrasonic flaw detection, which has higher detection accuracy than manual operation and reduces the demand for labor.

[0017] (2) The application uses the limiting module to laterally abut the column end plate away from the measured end to limit the whole measured steel member, so that the back surface of the measured column end plate does not need to use an abutting structure, thereby avoiding the problem that ultrasonic waves escape to the abutting structure, so that as many ultrasonic waves as possible are conducted to the vicinity of the weld, thereby improving the intensity of the ultrasonic waves received by the weld and improving the detection accuracy.

[0018] (3) The second driving wheel of the transverse support module can be lifted and lowered, thereby changing the relative height of the first driving wheel and the second driving wheel, so that the component column can be selectively pressed on the first driving wheel or the second driving wheel. The second driving wheel can be lowered to press the component column on the first driving wheel, so that the first driving wheel can drive the measured steel component to rotate smoothly during rotation, avoiding the problem that the friction between the component column and the second driving wheel hinders the rotation of the measured steel component. The second driving wheel can be raised to press the component column on the second driving wheel, so that the second driving wheel can drive the measured steel component to move transversely smoothly during rotation, avoiding the problem that the friction between the component column and the first driving wheel hinders the transverse movement of the measured steel component.

[0019] (4) When the transverse support ring abuts against the column end plate, if the column end plate rotates, the transverse support ring can synchronously rotate in the opposite direction, changing sliding to rolling, thereby reducing the friction between the measured steel component and the limiting module and improving the smoothness of the rotation of the measured steel component.

[0020] (5) The cap is arranged above the transverse support ring. During feeding, if the measured steel component shakes, the column end plate will move from top to bottom and hit the top surface of the cap instead of the top surface of the transverse support ring, thereby avoiding damage to the transverse support ring and the first bearing due to impact, and improving the service life of the application.

[0021] (6) The cap outer side wall is provided with a let-go plane, so that the outer contour of the transverse support ring is partially hidden and partially exposed below the cap. When the measured steel component needs to be rotated, the cap needs to be rotated to a position where the let-go plane is located between the column end plate and the inner support column, so that the exposed part of the transverse support ring (from below the let-go plane) can abut against the column end plate, avoiding contact and friction between the column end plate and the cap, and improving the smoothness of the rotation of the measured steel component.

[0022] (7) After the column end plate is pre-coated with a coupling layer / coupling liquid drop, during rotation of the column end plate, the coupling layer / coupling liquid drop will continuously hit the edge position of the first gap close to the cavity, and then it will be sucked into the first gap and fill the cavity due to capillary action, so as to reduce the area of the cavity and improve the continuity and stability of ultrasonic wave transmission.

[0023] (8) The third linear driver can drive the measured steel component to lift and lower, so that when the measured steel component rotates, the second movement path of the ultrasonic probe relative to the column end plate is a vortex line, thereby adapting to detect the inner and outer edges of a non-circular weld, improving the comprehensiveness of flaw detection, and avoiding the generation of a flaw detection blind area. BRIEF DESCRIPTION OF DRAWINGS

[0024] The application will be further described below in conjunction with the drawings: Figure 1 It is a front view schematic diagram of the overall structure of the application; Figure 2Fig. 1 is a front view of a schematic diagram of a position-limiting module structure; Figure 3 Fig. 2 is a front view of a schematic diagram of a vertical cross-section of the position-limiting module structure; Figure 4 Fig. 3 is a front view of a schematic diagram of a rotating support module structure; Figure 5 Fig. 4 is a front view of a schematic diagram of a vertical cross-section of a left view of a first driving wheel support member column state; Figure 6 Fig. 5 is a front view of a schematic diagram of a horizontal movement support module structure; Figure 7 Fig. 6 is a side view of a schematic diagram of a member column pressing a first driving wheel state; Figure 8 Fig. 7 is a side view of a schematic diagram of a member column pressing a second driving wheel state; Figure 9 Fig. 8 is a schematic diagram of a hoisting and feeding state of a measured steel member; Figure 10 Fig. 9 is a front view of a schematic diagram of a column end plate hitting a cap state; Figure 11 Fig. 10 is a front view of a schematic diagram of a column end plate abutting a cross brace ring state; Figure 12 Fig. 11 is a perspective view of a schematic diagram of a cap structure; Figure 13 Fig. 12 is a top view of a schematic diagram of a cap and cross brace ring setting state; Figure 14 Fig. 13 is a top view of a schematic diagram of a moving gap setting position; Figure 15 Fig. 14 is a top view of a schematic diagram of a driving module position and structure; Figure 16 Fig. 15 is a top view of a schematic diagram of a telescopic sheath position and structure; Figure 17 Fig. 16 is a front view of a schematic diagram of a flaw detection module structure; Figure 18 Fig. 17 is a schematic diagram of a coupling agent state in which a column end plate bottom is immersed in a water storage shell; Figure 19 Fig. 18 is a schematic diagram of a water storage shell structure; Figure 20 Fig. 19 is a schematic diagram of a coupling layer position and structure; Figure 21 Fig. 20 is a schematic diagram of a flaw detection state when a right end of a measured steel member is a measured end; Figure 22 Fig. 21 is a schematic diagram of an ultrasonic wave reflection state; Figure 23 Fig. 22 is a schematic diagram of an air forming position; Figure 24 Fig. 23 is a schematic diagram of a second movement path.

[0025] Explanation of reference signs: In the drawings, 1, test bench; 11, containing groove; 2, limiting module; 20, moving gap; 21, inner support column; 22, cross support ring; 23, first bearing; 24, bottom support ring; 25, compression sleeve; 26, cap; 261, let go of the plane; 262, special-shaped hole; 27, transmission vertical rod; 271, second bearing; 28, second motor; 3, rotating support module; 31, first vertical column; 311, third linear driver; 32, first drive wheel; 33, first sprocket; 34, second sprocket; 35, first chain; 36, first drive motor; 4, transverse support module; 41, lifting plate; 42, second vertical column; 43, third vertical column; 44, support wheel; 45, second drive wheel; 46, first linear driver; 47, second chain transmission structure; 471, third sprocket; 472, fourth sprocket; 273, second chain; 274, second drive motor; 5, water storage shell; 51, coupling agent; 52, second linear driver; 6, flaw detection module; 61, transverse vertical column; 611, bottom support plate; 62, extension arm; 63, ultrasonic probe; 630, first compression side; 631, lower extension; 6310, second compression side; 7, measured steel member; 71, member column; 72, column end plate; 721, coupling layer; 722, coupling droplet; 723, coupling agent liquid level; 724, cavity; 725, second moving path; 73, weld; 8, sling; 9, drive module; 91, sliding assembly; 911, sliding block; 912, slide rail; 92, lead screw; 921, shaft seat; 93, lead screw sleeve; 931, fin plate; 94, first motor; 95, telescopic sheath; 951, blocking vertical plate. DETAILED DESCRIPTION

[0026] According to the above structural features of the application, the embodiments of the application are further described: Referring to Figure 1 The measured steel member 7, i.e. the cylindrical steel member, comprises a member column 71 and a column end plate 72, and the column end plate 72 is provided with two and is welded and fixed with the two end faces of the member column 71 respectively. The member column 71 is a hollow straight cylindrical shape, and the weld 73 is located at the outer side wall position of the member column 71; the weld 73 is a circular ring structure matching the outer side wall of the member column 71.

[0027] Referring to Figure 1 With Figure 21The embodiment provides an ultrasonic flaw detection device and a flaw detection method for steel structure welding, which comprises a test table 1, limit modules 2 are arranged at the top surface of the test table 1, a rotary support module 3 and a transverse support module 4 are arranged at the middle of the top surface of the test table 1, and flaw detection modules 6 are arranged at the top surface of the test table 1.

[0028] With reference to Figure 1 When the ultrasonic flaw detection is performed on the weld 73 at the left end of the measured steel member 7 (that is, the left end of the measured steel member 7 is the measured end), the right limit module 2 is required to be transversely abutted against the left side wall position of the right column end plate 72, and the left flaw detection module 6 is required to be abutted against the right side wall position of the left column end plate 72, so that the transverse position of the measured steel member 7 is limited, the measured steel member 7 does not move transversely when rotating and always keeps a pressing state with the flaw detection module 6, thereby the continuous transmission of ultrasonic waves between the flaw detection module 6 and the left column end plate 72 is realized, and the precision of the flaw detection test is improved.

[0029] Similarly, with reference to Figure 21 When the ultrasonic flaw detection is performed on the weld 73 at the right end of the measured steel member 7 (that is, the right end of the measured steel member 7 is the measured end), the left limit module 2 is required to be transversely abutted against the right side wall position of the left column end plate 72, and the right flaw detection module 6 is required to be abutted against the left side wall position of the right column end plate 72, so that the transverse position of the measured steel member 7 is limited, the measured steel member 7 does not move transversely when rotating and always keeps a pressing state with the flaw detection module 6, thereby the continuous transmission of ultrasonic waves between the flaw detection module 6 and the left column end plate 72 is realized, and the precision of the flaw detection test is improved.

[0030] With reference to Figure 1 , Figure 4 and Figure 5The rotating support module 3 includes a first drive wheel 32 and a first column 31. The first drive wheel 32 supports the column 71 of the steel component 7 under test and drives the steel component 7 to rotate. The top end of the first column 31 is rotatably connected to the first drive wheel 32, and the bottom end is vertically fixed to the test bench 1 (e.g., by bolts or welding). A first wheel axle is vertically inserted and fixed at the center of the first drive wheel 32 (e.g., by bolts and keys). The top end of the first column 31 has a first groove, and the lower part of the first drive wheel 32 is placed in the first groove, with the top end extending from above the first groove (to prevent the first column 31 from contacting the steel component 7 under test). The two ends of the first wheel axle are respectively inserted into two mounting holes at the top of the first column 31 and connected by bearings, so that the first drive wheel 32 and the first wheel axle can rotate synchronously (i.e., at the same speed and in the same direction). The first axle is connected to the first drive motor 36 via a first chain drive structure. The first chain drive structure includes a first sprocket 33, a second sprocket 34, and a first chain 35. The end of the first axle is vertically inserted into the center of the first sprocket 33 and fixedly connected thereto (e.g., by bolts and keys). The end of the output shaft of the first drive motor 36 is vertically inserted into the center of the second sprocket 34 and fixedly connected thereto (e.g., by bolts and keys). The first chain 35 is looped and its two ends are connected to the first sprocket 33 and the second sprocket 34 respectively to achieve transmission. The housing of the first drive motor 36 is horizontally inserted into the first column 31 and fixedly connected (e.g., by bolts). When the output shaft of the first drive motor 36 rotates, it can drive the first sprocket 33 and the second sprocket 34 to rotate, thereby driving the first axle and the first drive wheel 32 to rotate, and thus driving the component column 71 pressed against the first drive wheel 32 to rotate, realizing the overall rotation of the steel component 7 being measured.

[0031] Reference Figure 6 and Figure 8 The lateral support module 4 includes a lifting plate 41, a second column 42, a third column 43, a support wheel 44, and a second drive wheel 45. The second drive wheel 45 supports the column 71 and drives the steel component 7 under test to move laterally until the column end plate 72 of the steel component 7, away from the tested end, laterally abuts against the limiting module 2. The second drive wheel 45 also drives the steel component 7 under test to move to the left until the column end plate 72 on the right side abuts against the limiting module 2 on the right side, for flaw detection of the weld 73 on the left column (in conjunction with...). Figure 1 The second drive wheel 45 (when rotating in the opposite direction) can drive the steel component 7 under test to move to the right until the column end plate 72 on the left side abuts against the left limit module 2, which is used to perform flaw detection on the weld 73 on the right side (in conjunction with...). Figure 21 ).

[0032] Reference Figure 6 and Figure 8, the second column 42 top end and support wheel 44 rotationally connected; support wheel 44 center position is inserted with a second axle (for example, through bolt and fixed connection), the second column 42 top end is provided with a second groove, the lower part of support wheel 44 is placed in the second groove, and the top end is stretched out from the top of the second groove (for avoiding the second column 42 and the measured steel member 7 contact); the two ends of the second axle are respectively inserted into the two mounting holes of the top end of the second column 42 and connected through the bearing, so that the support wheel 44 can support the member column 71 from below, and does not hinder the transverse movement of the member column 71 (the member column 71 is pressed on the top end of the support wheel 44, and when the member column 71 moves transversely, the support wheel 44 is passively rotated under the friction force, so as to ensure the smooth movement of the member column 71).

[0033] Referring to Figure 6 and Figure 8 , the third column 43 top end and second drive wheel 45 rotationally connected; second drive wheel 45 center position is inserted with a third axle (for example, through bolt and fixed connection), the third column 43 top end is provided with a third groove, the lower part of second drive wheel 45 is placed in the third groove, and the top end is stretched out from the top of the third groove (for avoiding the third column 43 and the measured steel member 7 contact); the two ends of the third axle are respectively inserted into the two mounting holes of the top end of the third column 43 and connected through the bearing, so as to realize the synchronous rotation (i.e. same speed and same direction) of the second drive wheel 45 and the third axle, then the second drive wheel 45 can support the member column 71 from below, and when the second drive wheel 45 rotates, it can drive the member column 71 pressed on the second drive wheel 45 to move transversely, realizing the overall transverse movement of the measured steel member 7. The third axle is connected with the second drive motor 274 through the second chain transmission structure 47, the second chain transmission structure 47 includes a third sprocket 471, a fourth sprocket 472 and a second chain 273, the end of the third axle is vertically inserted into the center position of the third sprocket 471 and fixedly connected therewith (for example, through bolt and fixed connection), the output shaft of the second drive motor 274 is vertically inserted into the center position of the fourth sprocket 472 and fixedly connected therewith (for example, through bolt and fixed connection), and the second chain 273 is connected in a ring shape and the two ends are respectively connected with the third sprocket 471 and the fourth sprocket 472 to realize transmission. The shell of the second drive motor 274 is fixedly connected with the lifting plate 41 (for example, through bolt fixed connection). When the output shaft of the second drive motor 274 rotates, it can drive the first sprocket 33 and the second sprocket 34 to rotate, and then drive the third axle and the second drive wheel 45 to rotate, and then drive the measured steel member 7 to move transversely.

[0034] Referring to Figure 6With Figure 8 The support wheel 44 is used to assist the second driving wheel 45 to support the measured steel member 7, avoiding the third wheel shaft from being overloaded and bent. The top end of the support wheel 44 and the top end of the second driving wheel 45 are flush in height, so as to realize stable support to the bottom surface of the measured steel member 7.

[0035] Referring to Fig. 5, Figure 7 , Figure 8 With Figure 14 The first driving wheel 32, the second driving wheel 45 and the support wheel 44 are arranged in pairs respectively, so as to stably support the bottom surface of the member column 71. The first driving wheel 32 is provided with at least four and arranged in a matrix, the second driving wheel 45 is provided with at least four and arranged in a matrix, and the support wheel 44 is provided with at least four and arranged in a matrix. The axial direction of the first wheel shaft is horizontally arranged along the length direction of the test bench 1, the axial direction of the second wheel shaft is horizontally arranged along the width direction of the test bench 1, and the axial direction of the third wheel shaft is horizontally arranged along the width direction of the test bench 1, so as to limit the turning of the first driving wheel 32, the support wheel 44 and the second driving wheel 45 respectively.

[0036] Referring to Fig. 6, Figures 6-8 The transverse support module 4 further comprises a first linear driver 46, the output shaft at the top end of the first linear driver 46 is fixedly connected (for example, fixedly connected by bolts) with the bottom surface of the lifting plate 41 perpendicularly, and the shell at the bottom end is fixedly connected (for example, fixedly connected by bolts) with the top surface of the test bench 1 perpendicularly. When the output shaft of the first linear driver 46 is stretched or retracted, the lifting plate 41 can be driven to lift, further driving the second column 42, the third column 43, the support wheel 44, the second driving wheel 45 and the measured steel member 7 to lift.

[0037] Referring to Fig. 7, Figure 7 The second driving wheel 45 can be lifted and lowered, so that the member column 71 can be selectively pressed on the first driving wheel 32 or the second driving wheel 45. When the second driving wheel 45 is lowered to press the member column 71 on the first driving wheel 32 (and the member column 71 is not in contact with the second driving wheel 45), the first driving wheel 32 can drive the measured steel member 7 to rotate smoothly during the rotation process, avoiding the problem that the friction between the member column 71 and the second driving wheel 45 hinders the rotation of the measured steel member 7. Figure 8 When the second driving wheel 45 is raised to press the member column 71 on the second driving wheel 45 (and the member column 71 is not in contact with the first driving wheel 32), the second driving wheel 45 can drive the measured steel member 7 to move laterally smoothly during the rotation process, avoiding the problem that the friction between the member column 71 and the first driving wheel 32 hinders the lateral movement of the measured steel member 7.

[0038] The defect detection module 6 close to the measured end can move laterally until it is laterally abutted with the column end plate 72 close to the measured end, so as to realize the defect detection operation on the weld 73.Figure 1 , the right end of the column end plate 72 and the right end of the limiting module 2 complete the abutment (and the measured steel member 7 is pressed on the first driving wheel 32), that is, the transverse horizontal positioning of the measured steel member 7 is realized, then the left side of the flaw detection module 6 is used to abut the left side of the column end plate 72 to realize ultrasonic detection of the left side of the weld 73. Referring to Figure 21 , the left end of the column end plate 72 and the left end of the limiting module 2 complete the abutment (and the measured steel member 7 is pressed on the first driving wheel 32), that is, the transverse horizontal positioning of the measured steel member 7 is realized, then the right side of the flaw detection module 6 is used to abut the right side of the column end plate 72 to realize ultrasonic detection of the right side of the weld 73.

[0039] Referring to Figure 9 , the flaw detection module 6 (on both sides) can be transversely moved to the inside of the limiting module 2 (on the corresponding side) (that is, the flaw detection module 6 is located between the limiting module 2 and the transverse moving support module 4), to be hidden, so as to avoid the column end plate 72 from hitting the flaw detection module 6 when the measured steel member 7 is hoisted. The bottom end of the hoisting rope 8 of the hoisting device (such as a travelling crane, a crown block, etc.) is provided with a lifting hook, and the outer edge position of the column end plate 72 is provided with a hanging hole, and the lifting hook is hooked in the hanging hole for hoisting the measured steel member 7. The hoisting rope 8 is easy to bend, and when the hoisting rope 8 is used to load and unload (place the measured steel member 7 on the present application to realize loading, or hoist the measured steel member 7 pressed on the present application to realize unloading) the measured steel member 7, the measured steel member 7 is easy to shake / swing, and the shaking column end plate 72 is easy to hit and damage the flaw detection module 6 (the ultrasonic probe 63 of the flaw detection module 6 is the most vulnerable structure), so when loading and unloading, the limiting module 2 is arranged outside the flaw detection module 6, so that when the column end plate 72 shakes / swings, it will hit the limiting module 2 instead of the flaw detection module 6, thereby protecting the flaw detection module 6 and prolonging the service life of the present application.

[0040] Referring to Figure 14 , the two limiting modules 2 located at the same end are provided with a moving gap 20, and the flaw detection module 6 can reciprocally transversely move in the moving gap 20, so as to change the relative position of the flaw detection module 6 and the limiting module 2.

[0041] Referring to Figures 1-3 , the limiting module 2 comprises an inner support column 21 and a transverse support ring 22 which is sleeved on the outer periphery of the inner support column 21 and can transversely rotate, and the outer side wall of the transverse support ring 22 away from the measured end can abut the inner side wall of the column end plate 72 away from the measured end. The transverse support ring 22 is arranged at the outer surface position of the inner support column 21 and protrudes; therefore, when the column end plate 72 abuts the limiting module 2, it is actually that the column end plate 72 abuts the outer side wall of the transverse support ring 22, so that during the rotation of the column end plate 72, the transverse support ring 22 can synchronously and reversely rotate, changing sliding into rolling, thereby reducing the friction between the measured steel member 7 and the limiting module 2 and improving the rotation fluency of the measured steel member 7.

[0042] With reference to Figures 1-3 , the cross support ring 22 is rotationally connected with the inner support column 21 through the first bearing 23, so as to improve the rotation fluency of the cross support ring 22. The outer side wall of the inner support column 21 is provided with a bottom support ring 24 (for example, through integral fixed connection or through bolt fixed connection), the inner ring body of the first bearing 23 is sleeved on the outer side wall position of the inner support column 21 and is press-fit on the upper surface of the bottom support ring 24, the cross support ring 22 is sleeved on the outer side wall position of the outer ring body of the first bearing 23 and is fixedly connected with the outer ring body (for example, through bolt fixed connection. The inner ring body and the outer ring body of the first bearing 23 are provided with balls or rollers therebetween, so as to realize the relative rotation between the inner ring body and the outer ring body. The first bearing 23 is a conventional prior art in the industry, and details are not described again. The outer side wall position of the inner support column 21 is sleeved with a press-fit cylinder 25, the bottom surface of the press-fit cylinder 25 is press-fit on the top surface of the inner ring body of the first bearing 23, and then the press-fit cylinder 25 and the bottom support ring 24 respectively clamp the inner ring body from the upper and lower sides to realize the installation of the first bearing 23. The inner support column 21 is fixedly connected with the press-fit cylinder 25 (for example, through bolt fixed connection).

[0043] With reference to Figures 9-13 , the limiting module 2 further comprises a cap 26, the cap 26 is buckled on the top end of the inner support column 21 and can be transversely rotated; the cap 26 is located above the cross support ring 22, the cap 26 and the cross support ring 22 are coaxially arranged, and the cap 26 and the inner support column 21 are coaxially arranged. With reference to Figure 10 , the cap 26 is used for protecting the cross support ring 22 and the first bearing 23 (during the feeding process, the column end plate 72 moves from top to bottom and is easy to hit the top surface of the cross support ring 22, which causes the cross support ring 22 and / or the first bearing 23 to be damaged by impact, and even causes the inner ring body and the outer ring body of the first bearing 23 to be separated, which causes the rotation ability of the cross support ring 22 and the first bearing 23 to be reduced).

[0044] With reference to Figures 9-13 , the top view projection outer contour of the cap 26 is in the shape of D. The maximum radius R1 of the outer side wall of the cap 26 is greater than the outer radius of the cross support ring 22, and since the cross support ring 22 and the cap 26 are coaxially arranged, the cross support ring 22 can be hidden below the cap 26. The outer side wall position of the cap 26 is provided with a give-way plane 261. When the measured steel member 7 is hoisted, the give-way plane 261 is located on the side of the cap 26 close to the rotary support module 3, so as to avoid the column end plate 72 from hitting and damaging the cross support ring 22 and the first bearing 23 during feeding (as shown in Figure 10 , if the measured steel member 7 shakes during feeding, the column end plate 72 will move from top to bottom and hit the top surface of the cap 26 instead of the top surface of the cross support ring 22).

[0045] The top end of the cap 26 is in the shape of an arc surface, which is used for guiding the column end plate 72.

[0046] With reference to Figure 11When the measured steel component 7 is pressed on the rotary support module 3 or the transverse support module 4, the yielding plane 261 is located on the side of the cap 26 away from the rotary support module 3, the yielding plane 261 is vertically arranged, and the part of the cross support ring 22 below the yielding plane 261 can be exposed laterally and abut against the side wall of the column end plate 72, thereby avoiding the problem of the column end plate 72 contacting and rubbing the cap 26 during rotation, and improving the smoothness of the rotation of the column end plate 72.

[0047] With reference to Figure 11 With reference to Figure 13 The yielding plane 261 is arranged in parallel with the axis of the cap 26. The vertical distance H1 between the axis of the cap 26 and the yielding plane 261 is less than the maximum radius R1 of the outer side wall of the cap 26, and the vertical distance H1 between the axis of the cap 26 and the yielding plane 261 is greater than the outer radius of the cross support ring 22, so that the outer contour of the cross support ring 22 can be partially hidden and partially exposed.

[0048] With reference to Figures 10-12 The inner support column 21 is a hollow structure. The inner cavity of the inner support column 21 is provided with a second motor 28 and a transmission vertical rod 27, both of which are vertically arranged. The top end of the transmission vertical rod 27 is fixedly connected to the axis position of the cap 26, and the bottom end is fixedly connected to the output shaft of the second motor 28 (for example, by bolt and key connection). The top end of the transmission vertical rod 27 is in the form of a prism (for example, a quadrangular prism), and the inner cavity top surface of the cap 26 is provided with a special-shaped hole 262 at the axis position, and the top end of the transmission vertical rod 27 is adapted to be inserted into the special-shaped hole 262 to transmit torque to the cap 26, so that the transmission vertical rod 27 and the cap 26 can rotate synchronously (i.e., at the same speed and in the same direction). The top end of the transmission vertical rod 27 is fixedly connected to the cap beam by bolts. The second motor 28 drives the rotation of the transmission vertical rod, which in turn drives the rotation of the cap 26. A second bearing 271 is installed between the inner wall of the inner cavity of the inner support column 21 and the transmission vertical rod 27, thereby limiting the transmission vertical rod 27; the shell of the second motor 28 is fixedly connected to the bottom end of the side wall of the inner support column 21 by bolts; the bottom end of the side wall of the inner support column 21 is provided with a wiring hole for arranging wires to supply power to the second motor 28.

[0049] The inner support column 21 is in the form of a hollow cylinder.

[0050] With reference to Figures 15-17 The flaw detection module 6 includes a transverse vertical column 61 and an ultrasonic probe 63 arranged laterally on the transverse vertical column 61. The bottom end of the transverse vertical column 61 is provided with a bottom support plate 611, and the bottom support plate 611 is fixedly connected to the transverse vertical column 61 by bolts.

[0051] With reference to Figures 15-17, the driving module 9 is connected between the test table 1 and the flaw detection module 6, and the driving module 9 comprises a sliding rail 912 assembly, a lead screw 92, a lead screw sleeve 93 and a first motor 94. The sliding rail 912 assembly comprises a sliding rail 912 and a sliding block 911, the sliding block 911 is buckled on the upper portion of the sliding rail 912 and is in sliding connection, the bottom end of the sliding rail 912 is fixedly connected with the top surface of the test table 1 (for example, by bolt connection), and the top surface of the sliding block 911 is fixedly connected with the bottom support plate 611 (for example, by bolt connection). The lead screw 92 is inserted and installed in the lead screw sleeve 93, the top end of the lead screw sleeve 93 is in close contact with and fixedly connected with the bottom surface of the bottom support plate 611 (for example, by bolt connection), and when the lead screw 92 rotates, the lead screw sleeve 93 and the flaw detection module 6 can be reciprocatingly and transversely moved along the axial direction of the lead screw 92; the lead screw 92 is arranged in parallel with the sliding rail 912.

[0052] With reference to Figures 15-17 , one end of the lead screw 92 is rotatably connected with a shaft seat 921, and the shaft seat 921 is fixedly installed at the position of the top surface of the test table 1 (for example, by bolt connection); the other end of the lead screw 92 is coaxially arranged with and fixedly connected with the output shaft of the first motor 94 (for example, by bolt and key connection), and the output shaft of the first motor 94 can drive the lead screw 92 to rotate, thereby driving the flaw detection module 6 to move transversely.

[0053] With reference to Figures 15-16 , the sliding rail 912 assembly is inserted into the moving gap 20.

[0054] With reference to Figure 16 and Figure 17 , the driving module 9 further comprises a telescopic sheath 95, the telescopic sheath 95 is in the shape of n and is buckled at the position of the upper surface of the test table 1. One end surface of the telescopic sheath 95 is in close contact with and fixedly connected with a blocking vertical plate 951 (for example, by bolt or adhesive connection), the other end surface is in close contact with and fixedly connected with a fin plate 931 (for example, by bolt or adhesive connection), the fin plate 931 is fixedly connected with the shell of the first motor 94 by bolts, and the blocking vertical plate 951 is fixedly connected with the test table 1 by bolts. A rectangular hole is formed in the top surface of the telescopic sheath 95, the bottom support plate 611 is in the shape of a rectangle and is adapted to be inserted into the rectangular hole, the edge of the rectangular hole is in close contact with and fixedly connected with the outer side wall of the bottom support plate 611 (for example, by adhesive connection or by bolt and sealing ring connection), and the lead screw 92, the lead screw sleeve 93, the sliding rail 912, the sliding block 911 and the shaft seat 921 are all arranged outside the telescopic sheath 95 to achieve dust prevention. The shell of the first motor 94 is fixedly connected with the top surface of the test table 1 (for example, by bolt connection).

[0055] With reference to Figure 17The flaw detection module 6 further comprises an extension arm 62 which is arranged transversely and fixedly connected (for example, by bolted connection or by integral connection) in a 7-shaped manner at the top end of the transverse column 61, and one end of the extension arm 62 away from the transverse column 61 is fixedly connected (for example, by bolted connection) with the ultrasonic probe 63.

[0056] With reference to Figure 17 With Figure 22 The ultrasonic probe 63 is vertically arranged, and the ultrasonic probe 63 adopts a transverse wave oblique probe. When the ultrasonic probe 63 is pressed against the side wall of the column end plate 72, it can emit ultrasonic waves towards the weld 73 near the measured end, and the reflected ultrasonic waves point to the weld 73, thereby realizing ultrasonic flaw detection.

[0057] With reference to Figures 17-19 The test bench 1 is provided with a water storage shell 5 capable of lifting on the top surface, and the water storage shell 5 is provided with a coupling agent 51 inside. The top surface of the water storage shell 5 is open, the periphery is sealed, and the bottom surface is sealed. The water storage shell 5 is in the shape of a crescent that fits the bottom of the column end plate 72. The bottom end of the ultrasonic probe 63 is provided with a lower extension part 631 (for example, by bolted connection), and the first pressing side surface 630 of the ultrasonic probe 63 and the second pressing side surface 6310 of the lower extension part 631 are coplanarly arranged, so that the first pressing side surface 630 and the second pressing side surface 6310 can be pressed on the side wall of the column end plate 72 at the same time. When the ultrasonic probe 63 is pressed against the column end plate 72, the water storage shell 5 can be raised so that the lower extension part 631 is immersed in the coupling agent 51, and the coupling agent 51 between the lower extension part 631 and the column end plate 72 flows into the space between the ultrasonic probe 63 and the column end plate 72 under capillary action. The first pressing side surface 630 and the column end plate 72 are filled with the coupling agent 51, which is beneficial to the continuous and stable transmission of ultrasonic waves, thereby improving the accuracy of flaw detection testing.

[0058] The test bench 1 is provided with a water storage shell 5 at each end on the top surface; during flaw detection, the water storage shell 5 near the measured end is raised to the bottom of the column end face (near the measured end) to immerse in the coupling agent 51 for flaw detection operation.

[0059] With reference to Figure 20 The user can pre-coat the coupling agent 51 on the inner side wall of the column end plate 72 near the measured end (i.e., the side wall near the component column 71) and form a coupling layer 721 or coupling droplets 722. The coupling layer 721 is annular, and the coupling droplets 722 are arranged in an annular shape. The outer diameter of the coupling layer 721 / coupling droplets 722 is adapted to the height of the ultrasonic probe 63, so that when the ultrasonic probe 63 is pressed against the side wall of the column end plate 72, the ultrasonic probe 63 is located in the annular region of the coupling layer 721 / coupling droplets 722. The coupling agent 51 attracted by capillary action and the coupling agent 51 in the coupling layer 721 / coupling droplets 722 are mixed with each other, which can fill and compensate the gap between the first pressing side surface 630 of the ultrasonic probe 63 and the column end plate 72 as much as possible.

[0060] Reference Figure 23 The gap between the first pressing side 630 and the side wall of the end plate 72 is called the first gap. The first pressing side 630 is stationary, while the side wall of the end plate 72 can rotate relative to the first pressing side 630. If the coupling agent 51 is not pre-coated on the side wall of the end plate 72, clean pieces of the end plate 72 side wall will continuously spiral into the first gap. The rotation of the end plate 72 side wall will transmit frictional force to the coupling agent 51 in the first gap, causing a cavity 724 to appear in the first gap facing the rotation direction of the end plate 72, thus causing the problem of blocked ultrasonic wave transmission. However, after pre-coating the coupling layer 721 / coupling droplet 722, during the rotation of the end plate 72, the coupling layer 721 / coupling droplet 722 will continuously impact the edge of the first gap near the cavity 724. Then, due to capillary action, it will be drawn into the first gap and fill the cavity 724, thereby reducing the area of ​​the cavity 724 and improving the continuity and stability of ultrasonic wave transmission.

[0061] Reference Figure 15 and Figure 18 The test bench 1 has a receiving groove 11 on its top surface for accommodating the water storage shell 5. A second linear actuator 52 is installed in the receiving groove 11. The output shaft at the top of the second linear actuator 52 is connected to the water storage shell 5 by a fixing agent (e.g., by bolts), and the outer shell at the bottom is inserted and fixed in the test bench 1 (e.g., by bolts). When the output shaft of the second linear actuator 52 extends or retracts, it can drive the water storage shell 5 to rise or fall. When the water storage shell 5 rises, the bottom of the column end plate 72 and the lower extension 631 are submerged below the coupling agent liquid level 723 in the water storage shell 5. When the water storage shell 5 falls, it can provide space for the lateral movement of the ultrasonic probe 63 and the recessed part (avoiding the problem of the ultrasonic probe 63 and the recessed part hitting the water storage shell 5 during lateral movement).

[0062] Reference Figures 15-18 To prevent the ends of the lead screw 92, bearing 921, and slide rail 912 from blocking the top opening of the receiving groove 11, the receiving groove 11 needs to be positioned on the outside of the end of the drive module 9. Therefore, the water storage shell 5 also needs to be positioned on the outside of the end of the drive module 9. The extension arm 62 allows the ultrasonic probe 63 to press against the end plate 72 without requiring the transverse column 61 / bottom support plate 611 to move laterally to the end of the slide rail 912 (with...). Figure 16 Taking the shown perspective as an example, the left half of the telescopic sleeve 95, even after being compressed, still retains a certain length. This compressed portion of the telescopic sleeve 95 will hinder the lateral movement of the horizontal column 61 / bottom support plate 611 to the end of the slide rail 912. At the same time, the slider 911 does not need to move to the end of the slide rail 912, thus avoiding the problem of accidental derailment.

[0063] When the weld 73 is a perfect circle, the first vertical column 31 is a rigid column (for example, a steel material integrally formed), and the rotary support module 3 cannot drive the measured steel member 7 to lift, and when the measured steel member 7 rotates, the first movement path of the ultrasonic probe 63 relative to the column end plate 72 is a perfect circle and is adapted to the perfect circular weld 73, so that the measured steel member 7 rotates one circle to complete the ultrasonic detection of the weld 73.

[0064] Referring to Figure 4 When the weld 73 is not a perfect circle (most of the welds 73 are circular due to thermal expansion and contraction during welding), the first vertical column 31 is a third linear driver 311 arranged vertically, and the third linear driver 311 can drive the measured steel member 7 to lift (micro-lift, single lift / drop 3-7 mm), and when the measured steel member 7 rotates (5-15 rotations), the second movement path 725 of the ultrasonic probe 63 relative to the column end plate 72 is a spiral line (see Figure 24 ), so as to adapt to detect the inner and outer edges of the circular weld 73, improve the overall detection, and avoid the detection blind area. The circular shape is, for example, an elliptical shape, a cam shape, etc.

[0065] Referring to Figure 4 , the bottom end shell of the third linear driver 311 is fixedly connected to the top surface of the test bench 1 (for example, fixedly connected by bolts). The first recess is arranged at the top end of the top output shaft of the third linear driver 311, and the first wheel shaft and the first driving motor 36 are connected to the top output shaft of the third linear driver 311, so as to realize synchronous lifting. When the output shaft of the third linear driver 311 is stretched or retracted, it can drive the first driving wheel 32 to lift, and in turn drive the measured steel member 7 to lift.

[0066] The first linear driver 46, the second linear driver 52, and the third linear driver 311 are electric push rods, pneumatic push rods, hydraulic push rods, or combinations thereof (for example, electro-hydraulic push rods).

[0067] The present application also includes a first pressure sensor, a second pressure sensor, and a third pressure sensor. The first pressure sensor is installed between the top end of the output shaft of the first linear driver 46 and the lifting plate 41 (see Figure 6 ), for detecting the pressure from the lifting plate 41, and in turn detecting whether the measured steel member 7 is stably pressed on the horizontal movement test bench 1. The second pressure sensor is installed between the outer side wall of the inner support column 21 (away from the rotary support module 3) and the inner side wall of the first bearing 23, and the second pressure sensor is used to detect the pressure from the first bearing 23 and the horizontal support ring 22, and in turn detect whether the column end plate 72 is in abutment with the horizontal support ring 22 (see Figure 1). A third pressure sensor is installed between the ultrasonic probe 63 and the extension arm 62, and the third pressure sensor is used to detect the pressure from the ultrasonic probe 63, and further detect whether the column end plate 72 is in abutment with the ultrasonic probe 63.

[0068] The application also comprises an ultrasonic flaw detector main body, which is fixedly installed on the side wall of the test table 1 by bolts. The ultrasonic flaw detector main body is used to analyze the electrical signals collected by the ultrasonic probe 63, which is a conventional prior art in the industry, and the specific structure will not be described again. The application also comprises an electrical cabinet, which is fixedly installed on the side wall of the test table 1 by bolts. The first driving motor 36, the second driving motor 274, the first motor 94, the second motor 28, the first linear driver 46, the second linear driver 52, the third linear driver 311, the ultrasonic probe 63, the ultrasonic flaw detector main body, the first pressure sensor, the second pressure sensor, the third pressure sensor, the warning light, and the warning horn are respectively connected with the electrical cabinet through wires and signal lines. The electrical cabinet is respectively connected with the external power supply and the external controller (such as a computer or a PLC programmable logic controller) through wires and signal lines. The external controller controls the first driving motor 36, the second driving motor 274, the first motor 94, the second motor 28, the first linear driver 46, the second linear driver 52, the third linear driver 311, the ultrasonic probe 63, the ultrasonic flaw detector main body, the first pressure sensor, the second pressure sensor, the third pressure sensor, the warning light, and the warning horn through the electrical cabinet, and the electrical cabinet and the external power supply and the external controller are connected through wires and signal lines.

[0069] The first linear driver 46 is provided with at least four and arranged in a matrix shape to realize stable support of the lifting plate 41. When the first pressure sensors above the four first linear drivers 46 all collect signals of increased pressure, it is judged that the measured steel member 7 has been placed stably (i.e., the feeding is completed), and then a signal of completing feeding is sent to the user (such as starting the warning light or the warning horn).

[0070] The coupling agent 51 is organic oil, transformer oil, glycerol, chemical paste, water, and water glass, which are all conventional prior arts in the industry, and the specific structure will not be described again.

[0071] The first driving motor 36, the second driving motor 274, the first motor 94, and the second motor 28 all adopt controllable motors (such as servo motors or stepping motors), and the external controller inputs electrical signals to the controllable motors to control the rotating speed, single rotation angle, and starting and stopping time of the output shaft of the controllable motors.

[0072] The outer circumferential surface of the first driving wheel 32 and the outer circumferential surface of the second driving wheel 45 are respectively provided with an anti-skid layer (for example, a rubber ring layer connected by bonding or by bolt fixing), so as to improve the friction force on the component column 71 and avoid slipping when driving the measured steel component 7 to move laterally / rotate.

[0073] The ultrasonic flaw detection method for steel structure welding includes the following steps: S1, the flaw detection module 6 moves laterally to the side of the limiting module 2 close to the rotating support module 3; S2, the cap 26 is turned until the accommodation plane 261 is located on the side of the cap 26 away from the rotating support module 3; S3, the second driving wheel 45 is raised, and then the measured steel component 7 is hoisted and placed laterally on the second driving wheel 45; S4, the cap 26 away from the measured end is turned until the accommodation plane 261 is located on the side of the cap 26 away from the rotating support module 3; S5, the second driving wheel 45 is turned and drives the measured steel component 7 to move laterally until the column end plate 72 away from the measured end is laterally abutted with the limiting module 2; S6, the second driving wheel 45 is lowered until the measured steel component 7 is pressed on the first driving wheel 32; then the first driving wheel 32 is turned and drives the measured steel component 7 to rotate, and the user applies coupling agent 51 to the inner side wall of the column end plate 72 and forms a coupling layer 721 or coupling liquid drops 722 in the process; S7, the flaw detection module 6 close to the measured end moves laterally until the ultrasonic probe 63 is laterally pressed with the column end plate 72 close to the measured end; S8, the water storage shell 5 is raised until the lower extension part 631 close to the measured end is immersed in the coupling agent 51; S9, the first driving wheel 32 is turned and drives the measured steel component 7 to rotate, and the column end plate 72 close to the measured end and the ultrasonic probe 63 pressed therewith rotate relatively to perform ultrasonic flaw detection; in the process, the third linear actuator 311 drives the first driving wheel 32 and the measured steel component 7 to rise / fall, so that the second movement path 725 of the ultrasonic probe 63 (close to the measured end) relative to the column end plate 72 (close to the measured end) is in a vortex line shape, so as to detect the inner and outer edges of the non-circular weld 73.

[0074] The present application has the advantages of simple structure, reliable function, automatic lateral positioning and rotary ultrasonic flaw detection of the measured steel component 7 arranged laterally, higher detection accuracy compared to manual operation, and reduced labor use.

[0075] The application utilizes the limiting module 2 to abut the column end plate 72 away from the measured end in the transverse direction, realizes the overall limiting of the measured steel member 7, and the back of the column end plate 72 close to the measured end (i.e. the side away from the member column 71) does not need to use the abutting structure, thereby avoiding the problem that the ultrasonic wave is conducted to the abutting structure, so that as many ultrasonic waves as possible (after being reflected at the position of the side wall of the back of the column end plate 72) are conducted to the vicinity of the weld 73, thereby improving the strength of the ultrasonic signal and the detection precision. The traditional positioning technology is to abut the back of the column end plate 72 (close to the measured end) on the abutting structure (for example, on the abutting plate), and then press the ultrasonic probe 63 on the front of the column end plate 72 to detect, which will cause the ultrasonic wave to be conducted into the abutting structure and lost, and then the strength of the ultrasonic signal conducted to the vicinity of the weld 73 will be reduced, thereby reducing the detection precision. The second gap will be generated between the abutting structure and the column end plate 72, and the generation of the second gap will cause the generation of the interference signal and reduce the detection precision; the application does not use the abutting structure, thereby avoiding the generation of the second gap.

Claims

1. An ultrasonic flaw detection device for steel structure welding, characterized in that: Including test bench (1), both ends of the top surface of the test bench (1) are provided with limiting module (2), the middle part of the top surface of the test bench (1) is provided with rotating support module (3) and transverse support module (4);Both ends of the top surface of the test bench (1) are provided with flaw detection module (6); The rotating support module (3) includes a first drive wheel (32), which can support the member column (71) of the measured steel member (7) and drive the measured steel member (7) to rotate;The transverse support module (4) includes a second drive wheel (45);The second drive wheel (45) can support the member column (71) and drive the measured steel member (7) to move transversely, so that the column end plate (72) away from the measured end of the measured steel member (7) is in lateral abutment with the limiting module (2); The flaw detection module (6) near the measured end can move transversely until it is in lateral abutment with the column end plate (72) near the measured end.

2. The apparatus for ultrasonic inspection of a steel structure weld according to claim 1, characterized in that: The second drive wheel (45) can be lifted and lowered, so that the member column (71) can be selectively pressed on the first drive wheel (32) or the second drive wheel (45).

3. The apparatus for ultrasonic inspection of a steel structure weld according to claim 2, characterized in that: The flaw detection module (6) can move transversely to the inside of the limiting module (2) to avoid the column end plate (72) from hitting the flaw detection module (6) when the measured steel member (7) is hoisted.

4. The apparatus for ultrasonic inspection of a steel structure weld according to claim 3, characterized in that: The limiting module (2) includes an inner support column (21) and a transverse support ring (22) which is sleeved on the outer periphery of the inner support column (21) and can rotate transversely;The outer side wall of the transverse support ring (22) can abut against the inner side wall of the column end plate (72) away from the measured end.

5. The apparatus for ultrasonic inspection of a steel structure weld according to claim 4, characterized in that: The limiting module (2) further includes a cap (26) which is buckled on the top end of the inner support column (21) and can rotate;The cap (26) is located above the transverse support ring (22) and is coaxially arranged, and the maximum radius of the outer side wall of the cap (26) is greater than the outer radius of the transverse support ring (22); The outer side wall of the cap (26) is provided with a let-in plane (261); When the measured steel member (7) is hoisted, the let-in plane (261) is located on the side of the cap (26) close to the rotating support module (3); When the measured steel member (7) is pressed on the rotating support module (3) or the transverse support module (4), the let-in plane (261) is located on the side of the cap (26) away from the rotating support module (3).

6. The apparatus for ultrasonic inspection of a steel structure weld according to claim 5, characterized in that: The vertical distance between the axis of the cap (26) and the let-in plane (261) is less than the maximum radius of the outer side wall of the cap (26).

7. The apparatus for ultrasonic inspection of a steel structure weld according to claim 6, characterized in that: The inner support column (21) is a hollow structure, and the inner cavity of the inner support column (21) is provided with a second motor (28) and a transmission vertical rod (27), the top end of the transmission vertical rod (27) is connected with the axis of the cap (26), and the bottom end is connected with the output shaft of the second motor (28).

8. The apparatus for ultrasonic inspection of a steel structure weld according to claim 7, characterized in that: The flaw detection module (6) includes a transverse vertical column (61) and an ultrasonic probe (63) arranged on the lateral side of the transverse vertical column (61), and the bottom end of the ultrasonic probe (63) is provided with a downward portion (631). The test bench (1) top surface is equipped with a water storage shell (5) that can be lifted, the water storage shell (5) is equipped with a coupling agent (51) inside; when the ultrasonic probe (63) is pressure connected with the column end plate (72), the water storage shell (5) can be lifted to the lower extension part (631) to be immersed in the coupling agent (51), so that the coupling agent (51) between the lower extension part (631) and the column end plate (72) flows into the ultrasonic probe (63) and the column end plate (72) under the capillary action.

9. The apparatus for ultrasonic inspection of a steel structure weld according to claim 8, characterized in that: The test bench (1) top surface is equipped with a containing groove (11) for containing the water storage shell (5), the containing groove (11) is equipped with a second linear actuator (52) inside, the top end of the second linear actuator (52) is connected with the water storage shell (5), and the bottom end is inserted and fixed in the test bench (1).

10. An ultrasonic inspection method for a steel structure welding, characterized by, The steel structure welding ultrasonic flaw detection device of claim 9 is used to detect the measured steel member (7), and the steps include: S1, the flaw detection module (6) is moved laterally to one side of the limiting module (2) close to the rotating support module (3); S2, the cap (26) is rotated until the accommodation plane (261) is located on one side of the cap (26) away from the rotating support module (3); S3, the second driving wheel (45) is lifted, then the measured steel member (7) is hoisted and placed laterally on the second driving wheel (45); S4, the cap (26) away from the measured end is rotated until the accommodation plane (261) is located on one side of the cap (26) away from the rotating support module (3); S5, the second driving wheel (45) is rotated and drives the measured steel member (7) to move laterally until the column end plate (72) away from the measured end is laterally abutted with the limiting module (2); S6, the second driving wheel (45) is lowered until the measured steel member (7) is pressure connected on the first driving wheel (32); then the first driving wheel (32) is rotated and drives the measured steel member (7) to rotate, in the process, the coupling agent (51) is coated on the inner wall of the column end plate (72) and forms a coupling layer (721) or a coupling droplet (722); S7, the flaw detection module (6) close to the measured end is moved laterally until the ultrasonic probe (63) is pressure connected with the column end plate (72) close to the measured end; S8, the water storage shell (5) is lifted until the lower extension part (631) close to the measured end is immersed in the coupling agent (51); S9, the first driving wheel (32) is rotated and drives the measured steel member (7) to rotate, the column end plate (72) close to the measured end and the ultrasonic probe (63) pressure connected therewith rotate relatively, and ultrasonic flaw detection is performed.

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