Steel box girder welding seam sealing detection device

Abstract

The invention relates to the technical field of steel box girder weld joint detection, and discloses a steel box girder weld joint sealing detection device which comprises a crawler-type moving structure, a detection box is arranged above the crawler-type moving structure, and a magnetic powder detection device, a cleaning device and an ultrasonic detection device are sequentially arranged in the detection box from left to right. During detection, a welding seam area is magnetized, a magnetic field is formed in a welding seam, once the welding seam has defects, magnetic line distortion can be caused at the defects, then a crawler-type moving structure is arranged on the steel box girder welding seam, equipment moves forwards after being started, a rotating motor drives a driving gear to rotate, and a driven gear meshed with the driving gear drives a threaded rod to rotate along with the driving gear; the extrusion plate is driven to press downwards, vacuum extrusion is applied to magnetic powder in the magnetic powder box, and the magnetic powder is uniformly sprayed to a welding seam area of a magnetic field through the plurality of branch pipes by the spraying head and is quickly adsorbed by a magnetic line distortion part, so that magnetic traces are quickly presented, defect positions are accurately indicated, and dynamic detection of a welding seam is achieved.

Description

Technical Field

[0001] The invention relates to the technical field of steel box girder weld detection, and in particular to a steel box girder weld sealing detection device. Background Art

[0002] Steel box girder, also known as steel plate box girder, is a common structural form for bridges with larger spans. It is called a steel box girder because of its box-like appearance. After the steel box girder is installed, multiple steel box girders need to be welded to ensure their tight connection. After welding multiple steel box girders, the welds need to be tested for sealing to ensure that the steel box girder is sealed, blocking the circulation of air inside the steel box girder with external air, and reducing the impact of the external environment on the interior of the steel box girder, such as corrosion. When testing the sealing of the steel box girder welds, it is generally determined by testing the air tightness to determine whether it is sealed.

[0003] After searching, the applicant found that a Chinese patent disclosed "a steel box girder weld sealing detection device", and its publication (announcement) number is "CN222013452U". The patent mainly includes a body, a sealing rubber pad is fixed to the bottom of the body, and a pair of through grooves are opened at the bottom of the side wall of the body. When the steel box girder weld is sealed, the above structure makes the connection between the weld and the device tighter and reduces the possibility of external gas entering the detection device from the connection. However, in the above-mentioned prior art, the weld is filled with a wax film formed after the wax particles are melted. Some cracks with smaller widths may be covered by the wax film, resulting in the detection device being unable to accurately detect the existence of defects, affecting the accurate evaluation of the weld quality. For this reason, we propose a steel box girder weld sealing detection device. Summary of the invention

[0004] The purpose of the present invention is to provide a steel box girder weld sealing detection device to solve the problem proposed in the above-mentioned background technology that in the above-mentioned prior art, the weld is filled with a wax film formed after the wax particles are melted, and some cracks with smaller widths may be covered by the wax film, resulting in the detection device being unable to accurately detect the existence of defects, thereby affecting the accurate assessment of the weld quality.

[0005] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a steel box girder weld sealing detection device, comprising a crawler-type mobile structure, a detection box is arranged above the crawler-type mobile structure, and a magnetic powder detection device, a cleaning device and an ultrasonic detection device are arranged in sequence from left to right inside the detection box, the magnetic powder detection device comprises a magnetic powder box and a mounting frame, the magnetic powder box is connected to an extrusion plate and a driven gear through a threaded rod, the mounting frame is fixedly connected to a rotating shaft and a driving gear through a rotating motor, the magnetic powder box is connected to a branch pipe and a spray head through a powder conveying pipe, the cleaning device comprises a fixed frame, the fixed frame is fixedly connected to a push plate through a hydraulic rod, the push plate is fixedly connected to a rotating shaft through a servo motor, the rotating shaft is connected to a second gear through a first gear, and the second gear is connected to a fixed disk and a cleaning brush through a rotating rod.

[0006] As a further solution of the present invention, a limiting groove is provided through the middle of the surface of the detection box, and a mounting groove is provided on the left end surface thereof.

[0007] As a further solution of the present invention, the magnetic powder box is fixedly installed inside the mounting groove, the mounting frame is fixedly installed on the surface of the detection box and is located above the mounting groove, the threaded rod is rotatably connected to the internal axis of the magnetic powder box, the extrusion plate is threadedly connected to the circumferential surface of the threaded rod and slidably connected to the inner wall of the magnetic powder box, and the rotating motor is fixedly installed on the right outer surface of the mounting frame.

[0008] As a further solution of the present invention, the rotating shaft is fixedly installed on the output end of the rotating motor, the driving gear is fixedly installed on the end of the rotating shaft away from the rotating motor, the end of the threaded rod away from the magnetic powder box is rotatably connected to the top of the mounting frame, the driven gear is fixedly installed on the circumferential surface of the threaded rod, the driving gear is meshingly connected with the driven gear, the powder conveying pipe is fixedly installed on the lower end of one side of the magnetic powder box through a conduit, the branch pipes are provided in multiple groups and are fixedly installed at the inside of the powder conveying pipe at equal distances, and the spraying heads are provided in multiple groups and are respectively fixedly installed on the ends of the multiple groups of branch pipes away from the powder conveying pipes.

[0009] As a further solution of the present invention, the fixing frame is fixedly installed on the top of the detection box and is located above the limit groove. The hydraulic rods are provided in two groups and are respectively fixedly installed on the front and rear ends inside the fixing frame. The push plate is fixedly installed on the output ends of the two groups of hydraulic rods. The inner wall of the limit groove is provided with a sliding groove adapted to the push plate. The servo motor is fixedly installed on the surface of the push plate and is located between the two groups of hydraulic rods.

[0010] As a further solution of the present invention, the rotating shaft is fixedly installed on the output end of the servo motor, the first gear is fixedly installed on the end of the rotating shaft away from the servo motor, the rotating rods are provided with two groups and are symmetrically arranged with respect to the rotating shaft, the two groups of rotating rods are rotatably connected to the bottom of the pushing plate, the second gears are provided with two groups and are respectively fixedly installed on the circumferential surfaces of the two groups of rotating rods, and the two groups of second gears are meshed and connected with the first gears.

[0011] As a further solution of the present invention, the fixed disk is provided with two groups and is respectively fixedly installed on one end of the two groups of rotating rods away from the pushing plate. The cleaning brush is fixedly installed on the bottom of the fixed disk, and the cleaning brush does not contact the crawler movable structure.

[0012] As a further scheme of the present invention, the ultrasonic detection device includes a base plate fixedly installed on the right end surface of the detection box, two groups of support frames are fixedly installed on the surface of the base plate, and a data display screen is fixedly installed on the front side of the surface, a mounting block is fixedly installed between the two groups of support frames, the internal rotation of the mounting block is connected with a fixed shaft, the top and bottom of the fixed shaft are respectively fixedly installed with a U-shaped frame and a third bevel gear, the internal rotation of the U-shaped frame and the fixed shaft are connected with a transmission shaft, the top and bottom of the transmission shaft are respectively fixedly installed with an active bevel gear and a second bevel gear, the tops of the two groups of support frames are respectively fixedly installed with a first motor and a second motor, the output ends of the first motor and the second motor are respectively fixedly installed with a first rotating rod and a second rotating rod, and the other ends of the first rotating rod and the second rotating rod are respectively fixedly installed with a first bevel gear and a fourth bevel gear.

[0013] As a further solution of the present invention, the U-shaped frame is internally rotatably connected with a transmission rod, a driven bevel gear and an adjusting block are fixedly installed on the circumferential surface of the transmission rod, a rocker arm is fixedly installed on the surface of the adjusting block, an ultrasonic sensor is fixedly installed on the end of the rocker arm away from the adjusting block, the ultrasonic sensor is electrically connected to the data display screen, the third bevel gear is meshingly connected with the fourth bevel gear, the first bevel gear is meshingly connected with the second bevel gear, the active bevel gear is meshingly connected with the driven bevel gear, and the first bevel gear and the second bevel gear are both rotatably connected to the surface of the base plate.

[0014] Technical effects and advantages of the present invention: 1. Through the magnetic particle detection device, during the detection, the weld area is first magnetized to form a magnetic field inside the weld. Once there is a defect in the weld, the defect will cause magnetic field line distortion. Then, the crawler mobile structure is placed on the weld of the steel box girder. After starting the equipment, as the mobile structure moves forward, the rotating motor drives the active gear to rotate, and the driven gear meshing with it drives the threaded rod to rotate accordingly, causing the extrusion plate to press down and apply vacuum extrusion to the magnetic powder in the magnetic powder box. Under this action, the magnetic powder is evenly sprayed from the spray head through multiple branch pipes to the weld area covered by the magnetic field. Since the magnetic powder has ferromagnetism, it will be quickly adsorbed by the distorted part of the magnetic field line, and then quickly present magnetic marks, accurately indicating the defect location, achieving dynamic detection of the weld, and efficiently and accurately controlling the weld quality; 2. After determining the position of the weld defect through the ultrasonic detection device, the ultrasonic detection device is manipulated into place, and the first motor is used to drive the first bevel gear, which is linked to the second bevel gear. The active bevel gear drives the driven bevel gear to rotate, and then the transmission rod is used to cause the adjustment block and the rocker arm to rotate, and the longitudinal position of the ultrasonic sensor is accurately adjusted. Then, the second motor is started, and the third bevel gear and the fourth bevel gear work together to drive the U-shaped frame to rotate left and right, and the ultrasonic sensor is accurately adjusted to be perpendicular to the defective weld. Subsequently, the ultrasonic sensor is vertically aligned with the weld to emit a high-frequency signal. At this time, if there are defects in the weld or the sealing is poor, the ultrasonic wave will produce reflection, refraction and scattering phenomena, and the key parameters such as the time, intensity, and waveform of the reflected wave will be displayed on the data display screen in real time. Based on this analysis, the technicians can accurately judge the sealing condition of the weld at that position and complete the static fine detection of the specific part of the weld. 3. Through the cleaning device, when the crawler mobile structure moves forward, two sets of hydraulic rods synchronously push the push plate downward, causing the cleaning brushes at the bottom of the two sets of rotating rods to fit closely to the surface of the steel box girder. At this time, the servo motor is started, and the rotating shaft immediately drives the first gear to rotate, and the two second gears meshing with it also rotate accordingly, thereby driving the two sets of cleaning brushes to rotate at high speed, sweeping away the dust and debris around the weld on the surface of the steel box girder. In this way, dust adhesion can be effectively prevented from affecting the magnetic powder adsorption effect, ensuring the accuracy and reliability of subsequent test results. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of the three-dimensional structure of the present invention; Figure 2 It is a right-side stereoscopic structural schematic diagram of the present invention; Figure 3 It is a right-side plan view structural schematic diagram of the present invention; Figure 4 It is a front cross-sectional structural schematic diagram of the present invention; Figure 5 It is a structural schematic diagram of the magnetic powder detection device of the present invention; Figure 6 It is a schematic diagram of the structure of the cleaning device of the present invention; Figure 7 It is a schematic diagram of the structure of the ultrasonic detection device of the present invention; Figure 8 This is one of the partial structural schematic diagrams of the ultrasonic detection device of the present invention; Fig. 9 This is the second schematic diagram of the partial structure of the ultrasonic detection device of the present invention.

[0016] In the figure: 1, crawler mobile structure; 2, detection box; 3, magnetic powder detection device; 4, cleaning device; 5, ultrasonic detection device; 6, installation slot; 7, limit slot; 301, magnetic powder box; 302, mounting frame; 303, rotating motor; 304, rotating shaft; 305, driving gear; 306, threaded rod; 307, driven gear; 308, extrusion plate; 309, powder conveying pipe; 310, branch pipe; 311, spray head; 401, fixed frame; 402, hydraulic rod; 403, push plate; 404, servo motor; 405, rotating shaft; 406, rotating rod; 407, first gear; 408, second gear Wheel; 409, fixed plate; 410, cleaning brush; 501, bottom plate; 502, data display screen; 503, support frame; 504, mounting block; 505, first motor; 506, first rotating rod; 507, first bevel gear; 508, second bevel gear; 509, transmission shaft; 510, active bevel gear; 511, fixed shaft; 512, third bevel gear; 513, fourth bevel gear; 514, second rotating rod; 515, second motor; 516, U-shaped frame; 517, transmission rod; 518, adjustment block; 519, driven bevel gear; 520, swing rod; 521, ultrasonic sensor. DETAILED DESCRIPTION

[0017] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0018] Example 1

[0019] Please see attached Figure 1 - Attachment Figure 5A steel box beam weld sealing detection device comprises a crawler-type mobile structure 1, a detection box 2 is arranged above the crawler-type mobile structure 1, a magnetic powder detection device 3, a cleaning device 4 and an ultrasonic detection device 5 are arranged in sequence from left to right inside the detection box 2, the magnetic powder detection device 3 comprises a magnetic powder box 301 and a mounting frame 302, the magnetic powder box 301 is connected with an extrusion plate 308 and a driven gear 307 through a threaded rod 306, the mounting frame 302 is fixedly connected with a rotating shaft 304 and a driving gear 305 through a rotating motor 303, and the magnetic powder box 3 01 A branch pipe 310 and a spray head 311 are connected through a powder delivery pipe 309. A limit groove 7 is provided in the middle of the surface of the detection box 2, and a mounting groove 6 is provided on the left end surface. The crawler-type mobile structure 1 can remain stable during movement. It can efficiently complete the weld inspection task according to the preset inspection path and speed, thereby improving the inspection efficiency. Compared with the roller mobile platform, the moving speed is relatively slow, and the roller movement may generate a large inertia when starting, stopping and turning, which affects the inspection accuracy. The magnetic powder box 301 is fixed The mounting frame 302 is fixedly mounted on the surface of the detection box 2 and is located above the mounting slot 6. The threaded rod 306 is rotatably connected to the inner axis of the magnetic powder box 301. The extrusion plate 308 is threadedly connected to the circumferential surface of the threaded rod 306 and is slidably connected to the inner wall of the magnetic powder box 301. The rotating motor 303 is fixedly mounted on the right outer surface of the mounting frame 302. The rotating shaft 304 is fixedly mounted on the output end of the rotating motor 303. The driving gear 305 is fixedly mounted on the rotating shaft 304 away from the rotating motor 30 3, one end of the threaded rod 306 away from the magnetic powder box 301 is rotatably connected to the top of the mounting frame 302, the driven gear 307 is fixedly installed on the circumferential surface of the threaded rod 306, the driving gear 305 is meshed and connected with the driven gear 307, the powder conveying pipe 309 is fixedly installed on the lower end of one side of the magnetic powder box 301 through a conduit, a plurality of branch pipes 310 are provided and fixedly installed at the inside of the powder conveying pipe 309 at equal distances, and a plurality of spray heads 311 are provided and fixedly installed at one end of the plurality of branch pipes 310 away from the powder conveying pipe 309.

[0020] Before spraying magnetic powder, an energized coil is first wrapped around the workpiece where the weld is located. When current passes through the coil, a magnetic field is generated inside the coil, thereby magnetizing the weld area located in the magnetic field. After reaching a certain magnetization intensity, the magnetization current is cut off or the magnetization magnetic field is removed, so that the weld area retains a certain residual magnetism, and then magnetic powder is sprinkled. When the weld has defects, the magnetic line distortion caused by the residual magnetism will attract the magnetic powder and show the defects. Finally, the magnetized workpiece is placed in an alternating magnetic field with gradually weakening intensity through AC demagnetization, so that the magnetic domains in the steel box girder are constantly rearranged as the magnetic field changes, and eventually become disordered and lose their magnetism.

[0021] Specifically, the area where the weld is located is first magnetized to generate a magnetic field inside the weld. If there is a defect in the weld, the magnetic lines of force will be distorted at the defect. Then the crawler mobile structure 1 is erected at the weld where the steel box beam is connected. While moving, the rotating motor 303 drives the driving gear 305 to rotate, and the driven gear 307 meshing with it drives the threaded rod 306 to rotate, so that the extrusion plate 308 moves downward to vacuum extrude the magnetic powder in the magnetic powder box 301. The magnetic powder is evenly sprayed on the weld in the magnetic field through multiple branch pipes 310 and a spray head 311. The magnetic powder will be adsorbed by the distorted area of ​​the magnetic lines of force to form magnetic marks, thereby quickly displaying the location of the defect and realizing dynamic weld detection. The magnetic powder can be fluorescent magnetic powder, which will emit bright fluorescence under the irradiation of ultraviolet light. This fluorescence makes the magnetic mark very eye-catching and the location of the defect is easy to observe.

[0022] Example 2

[0023] Please see attached Figure 1 - Attachment Figure 4 And attached Figure 7 - Attachment Fig. 9 , and on the basis of Example 1, it is further obtained that the ultrasonic detection device 5 includes a bottom plate 501 fixedly installed on the right end surface of the detection box 2, two groups of support frames 503 are fixedly installed on the surface of the bottom plate 501, and a data display screen 502 is fixedly installed on the front side of the surface, a mounting block 504 is fixedly installed between the two groups of support frames 503, the internal rotation of the mounting block 504 is connected with a fixed shaft 511, the top and bottom of the fixed shaft 511 are respectively fixedly installed with a U-shaped frame 516 and a third bevel gear 512, the internal rotation of the U-shaped frame 516 and the fixed shaft 511 is connected with a transmission shaft 509, the top and bottom of the transmission shaft 509 are respectively fixedly installed with an active bevel gear 510 and a second bevel gear 508, the top of the two groups of support frames 503 are respectively fixedly installed with a first motor 505 and a second motor 515, and the output ends of the first motor 505 and the second motor 515 are respectively fixedly installed with The first rotating rod 506 and the second rotating rod 514, the other ends of the first rotating rod 506 and the second rotating rod 514 are respectively fixedly installed with the first bevel gear 507 and the fourth bevel gear 513, the U-shaped frame 516 is internally rotatably connected with the transmission rod 517, the circumferential surface of the transmission rod 517 is fixedly installed with the driven bevel gear 519 and the adjustment block 518, the surface of the adjustment block 518 is fixedly installed with the swing rod 520, the end of the swing rod 520 away from the adjustment block 518 is fixedly installed with the ultrasonic sensor 521, the ultrasonic sensor 521 is electrically connected to the data display screen 502, the third bevel gear 512 is meshedly connected with the fourth bevel gear 513, the first bevel gear 507 is meshedly connected with the second bevel gear 508, the active bevel gear 510 is meshedly connected with the driven bevel gear 519, and the first bevel gear 507 and the second bevel gear 508 are both rotatably connected to the surface of the base plate 501.

[0024] The steel box girder is a three-dimensional structure. In the actual manufacturing process, in order to meet various requirements such as structural strength, stability and spatial layout, its splicing method is not limited to simple plane splicing. Even when splicing steel to increase the length or width of the steel box girder, welds in different planes may appear due to the needs of structural design. In order to enable the box girder to better withstand bending and torsion loads, the splicing of its side panels, top panels and bottom panels may be inclined. This inclined splicing will cause the welds to be not in the same plane. The welds may extend along the angle between the side panels and the top panels, thereby forming cross-plane welds. The ultrasonic detection device 5 enables the swing rod 520 to drive the ultrasonic sensor 521 to achieve highly flexible movement in three-dimensional space. It can easily reach various complex positions and angles and can better adapt to different directions of welds, such as curves, broken lines and welds on different planes. Before the ultrasonic detection device 5 performs detection, the coupling agent can also be evenly applied to the weld surface. The use of the coupling agent can effectively reduce the reflection of ultrasonic waves at the interface, so that more ultrasonic energy can enter the weld. This can greatly reduce the interference of air on the detection and improve the accuracy of the detection.

[0025] Specifically, after the defect position is determined, the ultrasonic detection device is moved to the position, and the driven bevel gear 519 is driven to rotate through the cooperation of the first motor 505, the first bevel gear 507 and the second bevel gear 508 through the active bevel gear 510, thereby driving the adjustment block 518 and the swing rod 520 to rotate through the transmission rod 517, and adjusting the movement of the upper and lower spaces of the ultrasonic sensor 521. Subsequently, the U-shaped frame 516 is driven to rotate left and right through the cooperation of the second motor 515, the third bevel gear 52 and the fourth bevel gear 513 until the ultrasonic sensor 521 is adjusted to be perpendicular to the defective weld, and then the ultrasonic beam is aimed at the weld area to transmit a signal, so that the ultrasonic wave can be incident vertically on the weld and detect the defects therein. When the ultrasonic wave encounters defects in the weld or medium differences caused by poor sealing, reflection, refraction and scattering will occur. By displaying and analyzing the time, intensity and waveform of the received reflected waves on the data display screen 502, the sealing condition of the weld can be judged, and static detection of the specific position of the weld can be achieved.

[0026] Example 3

[0027] Please see attached Figure 1 - Attachment Figure 4 And attached Figure 6, and on the basis of Example 1, it is further obtained that the cleaning device 4 includes a fixed frame 401, the fixed frame 401 is fixedly connected to a push plate 403 through a hydraulic rod 402, the push plate 403 is fixedly connected to a rotating shaft 405 through a servo motor 404, the rotating shaft 405 is connected to a second gear 408 through a first gear 407, the second gear 408 is connected to a fixed plate 409 and a cleaning brush 410 through a rotating rod 406, the fixed frame 401 is fixedly installed on the top of the detection box 2 and is located above the limiting groove 7, the hydraulic rod 402 is provided with two groups and is respectively fixedly installed at the front and rear ends of the inside of the fixed frame 401, the push plate 403 is fixedly installed at the output end of the two groups of hydraulic rods 402, the inner wall of the limiting groove 7 is provided with a slide groove adapted to the push plate 403, and the servo motor 404 is fixedly installed It is mounted on the surface of the pushing plate 403 and is located between the two groups of hydraulic rods 402. The rotating shaft 405 is fixedly installed on the output end of the servo motor 404. The first gear 407 is fixedly installed on the end of the rotating shaft 405 away from the servo motor 404. There are two groups of rotating rods 406 and they are symmetrically arranged about the rotating shaft 405. The two groups of rotating rods 406 are both rotatably connected to the bottom of the pushing plate 403. There are two groups of second gears 408 and they are respectively fixedly installed on the circumferential surfaces of the two groups of rotating rods 406. The two groups of second gears 408 are both meshed and connected with the first gear 407. There are two groups of fixed plates 409 and they are respectively fixedly installed on the ends of the two groups of rotating rods 406 away from the pushing plate 403. The cleaning brush 410 is fixedly installed on the bottom of the fixed plate 409, and the cleaning brush 410 does not contact the crawler type moving structure 1.

[0028] The presence of dust particles will prevent the magnetic powder from being in close contact with the surface of the steel box girder. After the weld area is magnetized, the magnetic powder needs to be adsorbed on the weld surface and where defects may occur to display the defects. If there is dust on the surface, the magnetic powder is easily adsorbed on the dust instead of effectively gathering in the area of ​​magnetic line distortion caused by the defect. The dust is then cleaned by setting a cleaning device 4 to ensure detection accuracy.

[0029] Specifically, during the movement of the crawler mobile structure 1, the two hydraulic rods 402 drive the push plate 403 to move downward, and when the cleaning brushes 410 at the bottom of the two sets of rotating rods 406 come into contact with the surface of the steel box girder, the servo motor 404 is started, thereby driving the first gear 407 to rotate through the rotating shaft 405, and the two second gears 408 meshing with it rotate accordingly, thereby driving the two sets of cleaning brushes 410 to clean dust and other debris at the welds on the surface of the steel box girder, so as to prevent the dust on the surface of the steel box girder from affecting the adsorption of magnetic powder, resulting in low detection accuracy.

[0030] Working principle of the present invention: The present invention is a steel box girder weld sealing detection device. First, the weld area is magnetized by an energized coil to generate a magnetic field inside the weld. If there is a defect in the weld, the magnetic field lines will be distorted at the defect. Then the crawler-type mobile structure 1 is set up at the weld where the steel box girder is connected. While moving, two hydraulic rods 402 drive the push plate 403 to move downward, and when the cleaning brushes 410 at the bottom of the two sets of rotating rods 406 contact the surface of the steel box girder, the servo motor 404 is started, thereby driving the first gear 404 through the rotating shaft 405. 7 rotates, and the two second gears 408 meshing with it rotate along with it, thereby driving the two sets of cleaning brushes 410 to clean the dust and other debris on the weld on the surface of the steel box beam. At the same time, the rotating motor 303 drives the driving gear 305 to rotate, and the driven gear 307 meshing with it drives the threaded rod 306 to rotate, so that the extrusion plate 308 moves downward to vacuum extrude the magnetic powder in the magnetic powder box 301, and the magnetic powder is evenly sprayed on the weld in the magnetic field through multiple branch pipes 310 and the spray head 311, and the magnetic powder is distorted by the magnetic line of force. The ultrasonic detection device is moved to the position of the defect after the defect position is determined. The active bevel gear 510 drives the driven bevel gear 519 to rotate through the cooperation of the first motor 505, the first bevel gear 507 and the second bevel gear 508, thereby driving the adjustment block 518 and the swing rod 520 to rotate through the transmission rod 517. Then, the U-shaped frame 516 is driven to rotate left and right through the cooperation of the second motor 515, the third bevel gear 52 and the fourth bevel gear 513. The ultrasonic sensor 521 is adjusted to be perpendicular to the defective weld by combining the two, and then the ultrasonic beam is aimed at the weld area to transmit a signal, so that the ultrasonic wave can be vertically projected to the weld and detect the defects therein. When the ultrasonic wave encounters defects in the weld or medium differences caused by poor sealing, reflection, refraction and scattering will occur. By displaying and analyzing the time, intensity and waveform of the received reflected waves on the data display screen 502, the sealing condition of the weld can be determined, and static detection of the specific position of the weld can be achieved. At this point, the whole process ends.

[0031] Finally, it should be noted that the above is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, it is still possible for those skilled in the art to modify the technical solutions described in the aforementioned embodiments or to make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A steel box girder weld sealing detection device, comprising a crawler-type mobile structure (1), characterized in that: A detection box (2) is provided above the crawler-type mobile structure (1), and a magnetic powder detection device (3), a cleaning device (4) and an ultrasonic detection device (5) are provided inside the detection box (2) in order from left to right, the magnetic powder detection device (3) comprising a magnetic powder box (301) and a mounting frame (302), the magnetic powder box (301) being connected to an extrusion plate (308) and a driven gear (307) via a threaded rod (306), the mounting frame (302) being fixedly connected to a rotating shaft (304) and a driving gear (305) via a rotating motor (303), and the magnetic powder box (301) being connected to a branch pipe (310) and a spray head (311) via a powder conveying pipe (309); The cleaning device (4) comprises a fixed frame (401), the fixed frame (401) being fixedly connected to a push plate (403) via a hydraulic rod (402), the push plate (403) being fixedly connected to a rotating shaft (405) via a servo motor (404), the rotating shaft (405) being connected to a second gear (408) via a first gear (407), and the second gear (408) being connected to a fixed disk (409) and a cleaning brush (410) via a rotating rod (406).

2. A steel box girder weld sealing detection device according to claim 1, characterized in that: A limiting groove (7) is provided through the middle of the surface of the detection box (2), and a mounting groove (6) is provided on the left end surface.

3. A steel box girder weld sealing detection device according to claim 1, characterized in that: The magnetic powder box (301) is fixedly mounted inside the mounting groove (6); the mounting frame (302) is fixedly mounted on the surface of the detection box (2) and is located above the mounting groove (6); the threaded rod (306) is rotatably connected to the internal axis of the magnetic powder box (301); the extrusion plate (308) is threadedly connected to the circumferential surface of the threaded rod (306) and slidably connected to the inner wall of the magnetic powder box (301); and the rotating motor (303) is fixedly mounted on the right outer surface of the mounting frame (302).

4. A steel box girder weld sealing detection device according to claim 3, characterized in that: The rotating shaft (304) is fixedly mounted on the output end of the rotating motor (303); the driving gear (305) is fixedly mounted on one end of the rotating shaft (304) away from the rotating motor (303); one end of the threaded rod (306) away from the magnetic powder box (301) is rotatably connected to the top of the mounting frame (302); the driven gear (307) is fixedly mounted on the circumferential surface of the threaded rod (306); the driving gear (305) is meshingly connected with the driven gear (307); the powder conveying pipe (309) is fixedly mounted on the lower end of one side of the magnetic powder box (301) through a conduit; a plurality of branch pipes (310) are provided and fixedly mounted inside the powder conveying pipe (309) at equal distances; and a plurality of spray heads (311) are provided and fixedly mounted on one end of the plurality of branch pipes (310) away from the powder conveying pipe (309).

5. The steel box girder weld sealing detection device according to claim 1, characterized in that: The fixing frame (401) is fixedly mounted on the top of the detection box (2) and is located above the limiting groove (7); two groups of hydraulic rods (402) are provided and are respectively fixedly mounted on the front and rear ends of the fixing frame (401); the pushing plate (403) is fixedly mounted on the output ends of the two groups of hydraulic rods (402); the inner wall of the limiting groove (7) is provided with a sliding groove adapted to the pushing plate (403); and the servo motor (404) is fixedly mounted on the surface of the pushing plate (403) and is located between the two groups of hydraulic rods (402).

6. A steel box girder weld sealing detection device according to claim 5, characterized in that: The rotating shaft (405) is fixedly mounted on the output end of the servo motor (404); the first gear (407) is fixedly mounted on one end of the rotating shaft (405) away from the servo motor (404); two groups of rotating rods (406) are provided and are symmetrically arranged with respect to the rotating shaft (405); the two groups of rotating rods (406) are both rotatably connected to the bottom of the pushing plate (403); two groups of second gears (408) are provided and are respectively fixedly mounted on the circumferential surfaces of the two groups of rotating rods (406); and the two groups of second gears (408) are both meshingly connected with the first gear (407).

7. A steel box girder weld sealing detection device according to claim 5, characterized in that: The fixed disk (409) is provided with two groups and is respectively fixedly mounted on one end of the two groups of rotating rods (406) away from the pushing plate (403); the cleaning brush (410) is fixedly mounted on the bottom of the fixed disk (409), and the cleaning brush (410) does not contact the crawler-type moving structure (1).

8. The steel box girder weld sealing detection device according to claim 1, characterized in that: The ultrasonic detection device (5) comprises a bottom plate (501) fixedly mounted on the right end surface of the detection box (2), two groups of support frames (503) are fixedly mounted on the surface of the bottom plate (501), and a data display screen (502) is fixedly mounted on the front side of the surface, a mounting block (504) is fixedly mounted between the two groups of support frames (503), the mounting block (504) is internally rotatably connected to a fixed shaft (511), a U-shaped frame (516) and a third bevel gear (512) are fixedly mounted on the top and bottom of the fixed shaft (511), and the internal rotation of the U-shaped frame (516) and the fixed shaft (511) is A transmission shaft (509) is connected, and a driving bevel gear (510) and a second bevel gear (508) are fixedly mounted on the top and bottom of the transmission shaft (509), respectively; a first motor (505) and a second motor (515) are fixedly mounted on the tops of the two groups of support frames (503), respectively; a first rotating rod (506) and a second rotating rod (514) are fixedly mounted on the output ends of the first motor (505) and the second motor (515), respectively; and a first bevel gear (507) and a fourth bevel gear (513) are fixedly mounted on the other ends of the first rotating rod (506) and the second rotating rod (514), respectively.

9. A steel box girder weld sealing detection device according to claim 8, characterized in that: The U-shaped frame (516) is rotatably connected to a transmission rod (517) inside, a driven bevel gear (519) and an adjustment block (518) are fixedly mounted on the circumferential surface of the transmission rod (517), a swing rod (520) is fixedly mounted on the surface of the adjustment block (518), an ultrasonic sensor (521) is fixedly mounted on one end of the swing rod (520) away from the adjustment block (518), the ultrasonic sensor (521) is electrically connected to the data display screen (502), the third bevel gear (512) is meshedly connected to the fourth bevel gear (513), the first bevel gear (507) is meshedly connected to the second bevel gear (508), the driving bevel gear (510) is meshedly connected to the driven bevel gear (519), and the first bevel gear (507) and the second bevel gear (508) are both rotatably connected to the surface of the bottom plate (501).

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