Flaw detection device for bridge construction

Abstract

The invention belongs to the technical field of flaw detection, and particularly relates to a flaw detection device for bridge construction, which comprises an ultrasonic flaw detector, the ultrasonic flaw detector comprises a flaw detector body; a probe is installed on the flaw detector through a connecting line and located in the rectangular cylinder, and the bottom face of the probe makes contact with the welding seam face. The top of the probe is provided with two guide rods, and the guide rods are located on the two sides of the connecting line. The two guide rods are connected with a guide cylinder in a sliding manner; a spring is arranged on the side, located in the guide cylinder, of the guide rod and used for connecting the guide rod and the guide cylinder. Two limiting rings are fixedly connected to the outer ring surfaces of the two guide cylinders; the device further comprises a protection mechanism. And by arranging the protection mechanism, external impurities can be blocked, and the detection result is prevented from being influenced by the existence of the impurities.

Description

Technical Field

[0001] The invention belongs to the technical field of flaw detection, in particular to a flaw detection device used in bridge construction. Background Art

[0002] In the field of bridge construction, the quality of welds is directly related to the safety and stability of the overall bridge structure. Since bridges bear complex effects such as vehicle loads and natural environmental erosion for a long time, any defects in welds are very likely to cause serious safety accidents during service. Therefore, it is extremely necessary to perform flaw detection on bridge construction welds. Ultrasonic testing or X-ray testing are commonly used to inspect bridge fillet welds. These methods can effectively detect weld defects such as porosity, slag inclusions, and lack of fusion. When selecting a flaw detection method, the specific weld conditions and inspection requirements must be considered to ensure accurate and reliable test results.

[0003] Preparation before testing includes cleaning the weld surface to remove impurities such as welding slag, oil, and rust, ensuring the test area is clean and flat. Use sandpaper or a grinder to treat the weld surface to reveal the metallic luster and improve detection accuracy. The area extending 25 mm on both sides of the weld must be treated to prevent impurities from interfering with the test signal. When using ultrasonic testing to inspect the welds of a bridge, first, the worker needs to evenly apply coupling agent to the cleaned weld. Then, the worker holds the probe and squats down to the weld. The worker moves the probe back and forth along the weld to inspect the weld. Then, the worker moves the probe horizontally along the weld, and gradually moves the probe back and forth along the welds at different locations to inspect the welds. During manual weld inspection, if foreign matter is pushed into the coupling agent by workers moving or by wind, it will affect the probe detection process. The presence of foreign matter will cause additional reflection and scattering, generating some irregular signals, which will interfere with the judgment of the inspector and increase the possibility of misjudgment. Summary of the Invention

[0004] In order to overcome the shortcomings of the existing technology and solve the above-mentioned technical problems, the present invention proposes a flaw detection device for bridge construction. By providing a protective mechanism, it can block external impurities and prevent the presence of impurities from affecting the detection results. The specific structure is as follows: A flaw detection device for bridge construction, comprising an ultrasonic flaw detector; the ultrasonic flaw detector comprises a flaw detector body; The flaw detector is provided with a probe via a connecting line, and the probe is located inside the rectangular tube, with the bottom surface of the probe in contact with the weld surface; Two guide rods are installed at the top of the probe, and the guide rods are located on both sides of the connecting wire; a guide cylinder is slidably connected to the two guide rods; a spring is provided on one side of the guide rod located inside the guide cylinder, and the spring is used to connect the guide rod and the guide cylinder; two limiting rings are fixedly connected to the outer circumferential surfaces of the two guide cylinders.

[0005] Preferably, it further includes a protection mechanism; the protection mechanism includes an occlusion chamber, and the cross-section of the occlusion chamber is in a U shape; the whole occlusion chamber is made of transparent acrylic plate material; Two rotating wheels are provided on the inner sides of the side plates on both sides of the occlusion chamber; two opposite rotating wheels are fixedly connected by a connecting rod, and the two connecting rods rotate on the side plates on both sides of the occlusion chamber; a part of the rotating wheel extends to the lower position of the occlusion chamber; Baffle plates are provided at the openings on both sides of the occlusion chamber; a chute is opened at the top of the occlusion chamber; a rectangular cylinder is slidably connected in the chute, and there is a certain distance between the rectangular cylinder and the lowest end of the rotating wheel; A C-shaped plate is provided on the right side of the rectangular cylinder, and the opening of the C-shaped plate faces downward; a brush roller is rotatably connected in the C-shaped plate, and the brush roller is used to apply a coupling agent to the bridge weld; a flow channel is fixedly connected above the C-shaped plate and extends above the occlusion chamber; A liquid chamber is installed at the top of the occlusion chamber above the flow channel, and the liquid chamber is communicated with the flow channel, and the liquid chamber is filled with a coupling agent; A re-cleaning component is provided at the position of the baffle plate on the right side, and the re-cleaning component is used to clean the weld again.

[0006] Preferably, the re-cleaning component includes two rotating rods; Both of the two rotating rods are inclined rods; the opposite sides of the two rotating rods are arranged staggeredly; the opposite sides of the two rotating rods both extend to the positions on both sides of the baffle plate; Mounting plates are fixedly connected to the side walls on both sides of the occlusion chamber, and the mounting plates are V-shaped plates; the two rotating rods rotate on the two mounting plates respectively; First motors are installed on the two mounting plates, and the first motors are used to drive the rotating rods to rotate; first cleaning brushes are provided on the two rotating rods.

[0007] Preferably, the first cleaning brush is spiral.

[0008] Preferably, a first gear is fixedly connected to the connecting rod close to the rotating rod; A second motor is installed on the baffle plate close to the rotating rod; a second gear meshing with the first gear is installed on the output shaft of the second motor; A reciprocating lead screw is rotatably connected to the top of the occlusion chamber on the right side of the chute; the reciprocating lead screw is driven by a third motor; A nut slider is spirally transmitted on the reciprocating screw, and the nut slider slides back and forth along the reciprocating screw; two convex slideways are provided on the top of the nut slider; a convex slider slides in the convex slideways; and a limiting plate is fixedly connected to the two convex sliders.

[0009] Preferably, both ends of the two connecting rods are fixedly connected to worms, and the worms extend to the outside of the shielding compartment; A worm wheel is provided under each of the four worms, and the worm wheel and the worm are meshed with each other; the two worm wheels on the same side correspond to each other and are connected to each other through a long rod; Side plates are provided on both sides of the long rod, and the side plates are fixedly connected to the shielding bin, and the long rod is rotated on the side plates on both sides; a second cleaning brush is fixedly connected to the long rod.

[0010] Preferably, the baffle on the left side of the rectangular tube is provided with an arc surface below; a round rod is rotatably connected to the bottom of the arc surface; and a shielding layer arranged evenly is fixedly connected to the outer ring surface of the round rod.

[0011] Preferably, a storage bottle is installed on the left side of the slide; the storage bottle is filled with watercolor paint; A conduit is fixedly mounted on the rectangular cylinder, and a control valve is mounted on the conduit; the conduit is communicated with the storage bottle through a connecting pipe.

[0012] Preferably, the connecting tube is a telescopic tube.

[0013] The beneficial effects of the present invention are as follows: 1. In the flaw detection device for bridge construction described in the present invention, since the weld is located inside the shielding chamber, the shielding chamber can block external impurities during the weld inspection process, thereby preventing impurities from being manually pushed or blown by wind, causing the impurities to move into the coupling agent, thereby affecting the probe inspection process. The presence of impurities will cause additional reflection and scattering, generating some irregular signals, which will interfere with the judgment of the inspector and increase the possibility of misjudgment.

[0014] 2. The flaw detection device for bridge construction described in the present invention controls the rotation of the first motor during the process of inspecting the weld, and the first motor drives the rotating rod to rotate, and the rotating rotating rod drives the first cleaning brush to rotate. Therefore, when the shielding bin moves, the staggered first cleaning brushes can clean the welds that have not been inspected in the moving direction of the shielding bin again, thereby avoiding the presence of impurities on the welds. When the coupling agent is applied, the impurities will be covered in the coupling agent, thereby affecting the process of weld inspection. At the same time, since the first cleaning brush is spiral, the impurities on the weld will be pushed to the two sides of the shielding bin during the rotation of the spiral first cleaning brush, thereby avoiding the accumulation of impurities in front of the first cleaning brush.

[0015] 3. The flaw detection device for bridge construction described in the present invention will rotate along both sides of the bottom weld during the rotation of the second cleaning brush. During this process, the second cleaning brush can not only block the side of the shielding bin, thereby preventing impurities from entering the interior of the shielding bin through the gap at the bottom of the shielding bin, but also the rotating second cleaning brush can push away impurities moving toward the shielding bin, thereby avoiding the presence of impurities near the outside of the shielding bin, which will interfere with the detection signal. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The present invention will be further described below with reference to the accompanying drawings.

[0017] Figure 1 Schematic diagram of the ultrasonic flaw detector of the present invention during detection; Figure 2 It is a structural diagram of the ultrasonic flaw detector and the protective mechanism of the present invention; Figure 3 This invention Figure 2 A partial enlarged view of the middle A; Figure 4 It is a structural diagram of the protection mechanism of the present invention; Figure 5 This invention Figure 4 A partial enlarged view of point B in the middle; Figure 6 It is a structural diagram of the ultrasonic flaw detector of the present invention; Figure 7 is a top view of the protective mechanism of the present invention; Figure 8 This invention Figure 7 Cross-sectional view at CC; Figure 9 This invention Figure 8 A partial enlarged view of point D in the middle; Figure 10 This invention Figure 7 Cross-sectional view at EE; Figure 11 This invention Figure 10 A partial enlarged view of point F in the middle.

[0018] In the figure: 1. Shielding bin; 11. Rotating wheel; 12. Connecting rod; 13. Baffle; 14. Chute; 15. Rectangular cylinder; 16. C-shaped plate; 17. Brush roller; 18. Flow channel; 19. Liquid bin; 2. Flaw detector body; 21. Probe; 22. Guide rod; 23. Guide cylinder; 24. Limit ring; 3. Rotating rod; 31. Mounting plate; 32. First motor; 33. First cleaning brush; 4. First gear; 41. Second motor; 42. Second gear; 5. Reciprocating lead screw; 51. Third motor; 52. Nut slider; 53. Convex slideway; 54. Convex slider; 55. Limiting plate; 6. Worm; 61. Worm gear; 62. Long rod; 63. Second cleaning brush; 64. Shielding layer; 7. Storage bottle; 71.导管; 72. Connecting pipe. Detailed implementation mode

[0019] In order to make the technical means, creative features, achieved purposes and functions of the present invention easy to understand, the present invention will be further described below in conjunction with specific implementation modes. It should be noted that the embodiments shown below of the present invention are based on the Figure 1-11 perspective for display and explanation, and also include the specific configuration of the parts in the embodiment of the flaw detection device for bridge construction in the present invention, the specific connection relationship and position relationship of the parts, etc., such as the specific quantity of the parts, the specific position relationship under the perspective of the attached drawing, etc. The purpose is to facilitate those skilled in the art to clearly and completely understand the present invention in combination with the attached drawing and the following embodiments, and to facilitate the implementation of the present invention, specifically as follows: Embodiment 1: As Figures 1 to 11 shown, a flaw detection device for bridge construction described in the present invention includes an ultrasonic flaw detector; the ultrasonic flaw detector includes a flaw detector body 2; A probe 21 is installed on the flaw detector body 2 through a connecting wire, and the probe 21 is located inside the rectangular cylinder 15, and the bottom surface of the probe 21 contacts the weld surface; Two guide rods 22 are installed on the top of the probe 21, and the guide rods 22 are located on both sides of the connecting wire; two guide rods 22 are slidably connected with a guide cylinder 23; a spring is provided on one side of the guide rod 22 located inside the guide cylinder 23, and the spring is used to connect the guide rod 22 and the guide cylinder 23; two limiting rings 24 are fixedly connected to the outer circumferential surfaces of the two guide cylinders 23; It further includes a protection mechanism; the protection mechanism includes a shielding bin 1, and the cross-section of the shielding bin 1 is in a U-shaped; the whole shielding bin 1 is made of transparent acrylic plate material; Two rotating wheels 11 are provided on the inner sides of the two side plates of the shielding bin 1; two opposite rotating wheels 11 are fixedly connected by a connecting rod 12, and the two connecting rods 12 rotate on the two side plates of the shielding bin 1; a part of the rotating wheel 11 extends to the lower position of the shielding bin 1; It should be noted that the "导管" in the original text seems to be an incomplete expression. If there is more specific information, it can be more accurately translated.Baffles 13 are provided at both sides of the shielding bin 1; a chute 14 is provided at the top of the shielding bin 1; a rectangular cylinder 15 is slidably connected in the chute 14, and a certain distance exists between the rectangular cylinder 15 and the lowest end of the rotating wheel 11; A C-shaped plate 16 is provided on the right side of the rectangular cylinder 15, with the opening of the C-shaped plate 16 facing downward; a brush roller 17 is rotatably connected to the inside of the C-shaped plate 16, and the brush roller 17 is used to apply coupling agent to the bridge weld; a flow channel 18 is fixedly connected above the C-shaped plate 16, and the flow channel 18 extends to the top of the shielding chamber 1; A liquid tank 19 is installed above the flow channel 18 and located on the top of the shielding chamber 1. The liquid tank 19 is connected to the flow channel 18 and contains coupling agent. The baffle 13 on the right side is provided with a re-cleaning component, and the re-cleaning component is used to clean the weld again; Specifically, before flaw detection of the welds after bridge construction, it is necessary to clean the weld surface and remove impurities such as welding slag, oil stains, rust, etc. on the weld to ensure that the inspection area is clean and flat; and use sandpaper or a grinder to process the weld surface to reveal the metallic luster, thereby improving the inspection accuracy. When the weld surface is cleaned, the shielding bin 1 is first placed above the weld, and then the shielding bin 1 is pushed to move a distance laterally along the weld. During the movement of the shielding bin 1, the rotating wheel 11 will rotate along both sides of the weld, and at the same time, the brush roller 17 will contact the weld surface and rotate along the weld. During the rotation of the brush roller 17, the coupling agent in the flow channel 18 can be brought out, and the coupling agent is applied to the weld surface through the brush roller 17, and then the control of the shielding bin 1 to move is stopped; More specifically, the probe 21 is then inserted into the rectangular tube 15, and the probe 21 will gradually slide downward in the rectangular tube 15 and gradually adhere to the applied coupling agent. When the probe 21 is in contact with the weld surface, the flaw detector body 2 is started. The guide rod 22 can then be manually pushed to move back and forth in the chute 14. At the same time, the probe 21 will follow the guide rod 22 to move back and forth, and drive the rectangular tube 15 to move back and forth in the chute 14. During the back-and-forth movement of the probe 21, the probe 21 can be tested back and forth along the longitudinal direction of the weld. When the inspection of this part of the weld is completed, the shielding chamber 1 is continued to be pushed to move the entire shielding chamber 1 horizontally along the weld. When the shielding chamber 1 moves, it drives the brush roller 17 to continue to apply coupling agent to the weld surface, and then continues to inspect the uninspected welds until all positions on the weld are inspected. Furthermore, since the weld is located inside the shielding chamber 1, during the process of inspecting the weld, the shielding chamber 1 can block external impurities, thereby preventing the impurities from being pushed manually or moved by wind, causing the impurities to move into the coupling agent, thereby affecting the detection process of the probe 21. The presence of impurities will cause additional reflections and scattering, generating some irregular signals, which will interfere with the judgment of the inspectors and increase the possibility of misjudgment.

[0020] Embodiment 2: The re-cleaning assembly includes two rotating rods 3; both rotating rods 3 are inclined rods; the two rotating rods 3 are staggered on opposite sides; the opposite sides of the two rotating rods 3 extend to the positions on both sides of the baffle 13; The side walls of the shielding compartment 1 are fixedly connected with mounting plates 31, and the mounting plates 31 are V-shaped plates; the two rotating rods 3 rotate on the two mounting plates 31 respectively; A first motor 32 is installed on each of the two mounting plates 31, and the first motor 32 is used to drive the rotating rod 3 to rotate; a first cleaning brush 33 is provided on each of the two rotating rods 3; In this embodiment, the first cleaning brush 33 is spiral-shaped; the first gear 4 is fixedly connected to the connecting rod 12 close to the rotating rod 3; A second motor 41 is mounted on the baffle 13 close to the rotating rod 3 ; a second gear 42 meshing with the first gear 4 is mounted on the output shaft of the second motor 41 ; The right side of the chute 14 is located at the top of the shielding compartment 1 and is rotatably connected to a reciprocating screw 5; the reciprocating screw 5 is driven by a third motor 51; The reciprocating screw 5 is spirally driven with a nut slider 52, and the nut slider 52 slides back and forth along the reciprocating screw 5; the top of the nut slider 52 is provided with two convex slideways 53; the convex sliders 54 slide in the convex slideways 53; the two convex sliders 54 are fixedly connected to the limit plates 55; Specifically, when inspecting the weld, you can choose to use the protective mechanism to automatically inspect the weld. The specific operation is as follows: first, by controlling the second motor 41 to drive the second gear 42 to rotate, the second gear 42 will drive the first gear 4 to rotate. When the first gear 4 rotates, it will drive two of the wheels 11 to rotate through the connecting rod 12. The rotating wheels 11 will drive the shielding chamber 1 to move along the weld as a whole, and gradually apply coupling agent to the weld. When the weld below the slide 14 is coated with coupling agent, the control wheel 11 stops rotating. , and place the probe 21 into the rectangular tube 15, and fit the probe 21 to the weld coated with coupling agent. Then push the limit plate 55 toward the guide tube 23. The limit plate 55 will drive the convex slider 54 to move in the convex slideway 53, and at the same time press the guide tube 23 downward, so that the guide tube 23 moves down along the guide rod 22 and compresses the spring. When the two limit rings 24 on the guide tube 23 are aligned with the two limit plates 55, pass the limit plate 55 between the two limit rings 24 and limit the guide tube 23. Then, the weld can be automatically inspected. More specifically, during detection, the third motor 51 is controlled to rotate, and the third motor 51 will drive the reciprocating screw 5 to rotate, and the reciprocating screw 5 will drive the nut slider 52 to move back and forth along the reciprocating screw 5, and at the same time drive the limit plate 55 to move back and forth, and the limit plate 55 that moves back and forth will push the guide cylinder 23, the guide rod 22, the probe 21 and the rectangular cylinder 15 to move back and forth in the slide groove 14, thereby moving back and forth along the longitudinal direction of the weld and performing detection. When the welding detection of this part is completed, the second motor 41 is controlled to drive, and the second motor 41 will drive the shielding chamber 1 as a whole to move along the weld through the second gear 42, the first gear 4 and the rotating wheel 11. When it moves to an undetected position, the third motor 51 continues to control the probe 21 to move back and forth, so that different positions of the weld can be automatically detected. At the same time, there is no need to manually squat to detect the weld, and it can also avoid pushing impurities into the coupling agent during manual movement. Furthermore, during the process of inspecting the weld, the first motor 32 is controlled to rotate, the first motor 32 will drive the rotating rod 3 to rotate, and the rotating rotating rod 3 will drive the first cleaning brush 33 to rotate. Therefore, when the shielding chamber 1 moves, the staggered first cleaning brushes 33 can clean the welds that have not been inspected in the moving direction of the shielding chamber 1 again, thereby avoiding the presence of impurities on the welds. When the coupling agent is applied, the impurities will be covered in the coupling agent, thereby affecting the process of weld inspection. At the same time, since the first cleaning brush 33 is spiral, the impurities on the weld will be pushed to the sides of the shielding chamber 1 during the rotation of the spiral first cleaning brush 33, thereby avoiding the accumulation of impurities in front of the first cleaning brush 33.

[0021] Embodiment 3: The two ends of the two connecting rods 12 are fixedly connected to the worm 6, and the worm 6 extends to the outside of the shielding compartment 1; A worm wheel 61 is provided below each of the four worms 6, and the worm wheel 61 is meshed with the worm 6; the two worm wheels 61 on the same side correspond to each other and are connected to each other through a long rod 62; The long rod 62 is provided with side plates on both sides, and the side plates are fixedly connected to the shielding compartment 1, and the long rod 62 is rotated on the side plates on both sides; the long rod 62 is fixedly connected to the second cleaning brush 63; In this embodiment, the baffle 13 on the left side of the rectangular tube 15 has an arc surface below; a round rod is rotatably connected below the arc surface; and a shielding layer 64 arranged evenly is fixedly connected to the outer circumference of the round rod; Specifically, during the rotation of the connecting rod 12, the worm gears 6 on both sides are driven to rotate. Since the worm gear 6 is meshed with the worm wheel 61, the worm wheel 61 is driven to rotate. The two worm wheels 61 on the same side are connected by a long rod 62, so the long rod 62 and the second cleaning brush 63 on the long rod 62 are driven to rotate. During the rotation of the second cleaning brush 63, it rotates along both sides of the bottom weld. During this process, the second cleaning brush 63 can not only block the side of the shielding bin 1, thereby preventing impurities from entering the interior of the shielding bin 1 through the gap at the bottom of the shielding bin 1, but also the rotating second cleaning brush 63 can push away impurities moving toward the shielding bin 1, thereby avoiding the presence of impurities near the outside of the shielding bin 1, which will interfere with the detection signal. More specifically, since the shielding chamber 1 is rotatably connected to the lower portion of the left baffle 13, and the shielding layer 64 is in contact with the weld surface, when the shielding chamber 1 moves, the shielding layer 64 rotates under the obstruction of the weld, and the shielding layer 64 in contact with the weld surface can be replaced. In this process, impurities located behind the shielding chamber 1 can be prevented from entering the interior of the shielding chamber 1. Example 4: A storage bottle 7 is installed on the left side of the chute 14; the storage bottle 7 contains watercolor paint; a conduit 71 is fixedly installed on the rectangular tube 15, and a control valve is installed on the conduit 71; the conduit 71 is connected to the storage bottle 7 through a connecting pipe 72; the connecting pipe 72 is a telescopic pipe; Specifically, as the rectangular tube 15 moves back and forth, the catheter 71 will be driven to move back and forth. At the same time, since the connecting tube 72 is a telescopic tube, the connecting tube 72 will be continuously stretched during the back and forth movement of the catheter 71. When the probe 21 detects an abnormality in the position of the weld, the solenoid valve is controlled to open. When the solenoid valve is opened, the watercolor paint inside the catheter 71 will fall to the left side of the probe 21. The watercolor paint here can mark the abnormal position of the weld. After the overall weld detection is completed, the marked position is retested.

[0022] In the description of the present invention, it should be noted that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate directions or positional relationships based on the attached Figure 1 The orientation or positional relationship shown is only for the convenience of describing the present invention and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation. Therefore, it cannot be understood as limiting the scope of protection of the present invention. In addition, the terms "first", "second", "third", etc. are only used to distinguish the description and cannot be understood as indicating or implying relative importance.

[0023] The basic principles, main features, and advantages of the present invention are shown and described above. Those skilled in the art should understand that the present invention is not limited to the foregoing embodiments. The foregoing embodiments and descriptions are merely illustrative of the principles of the present invention. Various changes and modifications may be made to the present invention without departing from the spirit and scope of the present invention. Such changes and modifications are intended to fall within the scope of the present invention. The scope of protection claimed in the present invention is defined by the appended claims and their equivalents.

Claims

1. A flaw detection device for bridge construction, comprising an ultrasonic flaw detector; characterized in that: It further includes a protection mechanism; the protection mechanism includes an occlusion bin (1), and the cross-section of the occlusion bin (1) is in a U shape; On both side plates of the occlusion bin (1) located inside the occlusion bin (1), there are two rotating wheels (11) respectively; two opposite rotating wheels (11) are fixedly connected by a connecting rod (12), and the two connecting rods (12) rotate on the side plates on both sides of the occlusion bin (1); a part of the rotating wheel (11) extends to the position below the occlusion bin (1); At the openings on both sides of the occlusion bin (1), there are baffles (13); on the top of the occlusion bin (1), there is a sliding groove (14); a rectangular cylinder (15) is slidably connected in the sliding groove (14), and there is a distance between the rectangular cylinder (15) and the lowest end of the rotating wheel (11); On one side of the rectangular cylinder (15), there is a C-shaped plate (16), and the opening of the C-shaped plate (16) faces downward; a brush roller (17) is rotatably connected inside the C-shaped plate (16); above the C-shaped plate (16), there is a flow channel (18) fixedly connected, and the flow channel (18) extends above the occlusion bin (1); Above the flow channel (18) and on the top of the occlusion bin (1), a liquid bin (19) is installed, the liquid bin (19) is communicated with the flow channel (18), and the liquid bin (19) is filled with a coupling agent; at the position of one of the baffles (13), a re-cleaning assembly for re-cleaning the weld seam is arranged.

2. The flaw detection device for bridge construction according to claim 1 is characterized in that: The ultrasonic flaw detector includes a flaw detector body (2); A probe (21) is installed on the flaw detector body (2) through a connecting wire, the probe (21) is located inside the rectangular cylinder (15), and the bottom surface of the probe (21) is in contact with the weld surface; Two guide rods (22) are installed on the top of the probe (21), and the guide rods (22) are located on both sides of the connecting wire; a guide cylinder (23) is slidably connected on the guide rods (22); on one side of the guide rod (22) located inside the guide cylinder (23), there is a spring, and the spring is used to connect the guide rod (22) and the guide cylinder (23); A limiting ring (24) is fixedly connected to the outer circumferential surface of the guide cylinder (23).

3. The flaw detection device for bridge construction according to claim 2 is characterized in that: The re-cleaning assembly includes two rotating rods (3); the rotating rods (3) are inclined rods; the opposite sides of the rotating rods (3) are arranged staggeredly; the opposite sides of the rotating rods (3) extend to the positions on both sides of the baffle (13); Mounting plates (31) are fixedly connected to the side walls on both sides of the occlusion bin (1), and the mounting plates (31) are V-shaped plates; the rotating rods (3) rotate on the mounting plates (31); A first motor (32) is installed on the mounting plate (31), and a first cleaning brush (33) is arranged on the rotating rod (3).

4. The flaw detection device for bridge construction according to claim 3 is characterized in that: The first cleaning brush (33) is spiral-shaped.

5. The flaw detection device for bridge construction according to claim 4 is characterized in that: A first gear (4) is fixedly connected to the connecting rod (12) close to the rotating rod (3); A second motor (41) is installed on the baffle (13) close to the rotating rod (3); a second gear (42) meshing with the first gear (4) is installed on the output shaft of the second motor (41); On one side of the sliding groove (14) and on the top of the occlusion bin (1), a reciprocating lead screw (5) is rotatably connected; the reciprocating lead screw (5) is driven by a third motor (51); The reciprocating screw (5) is provided with a spiral transmission nut slider (52), and the nut slider (52) slides back and forth along the reciprocating screw (5); two convex slideways (53) are provided on the top of the nut slider (52); a convex slider (54) slides in the convex slideways (53); and a limiting plate (55) is fixedly connected to the convex slider (54).

6. The flaw detection device for bridge construction according to claim 5 is characterized in that: The two end portions of the connecting rod (12) are fixedly connected to the worm gear (6), and the worm gear (6) extends to the outside of the shielding bin (1); A worm wheel (61) is provided below the worm (6), and the worm wheels (61) located on the same side correspond to each other and are connected to each other via a long rod (62); Side plates are provided on both sides of the long rod (62), the side plates are fixedly connected to the shielding bin (1), and the long rod (62) rotates on the side plates on both sides; a second cleaning brush (63) is fixedly connected to the long rod (62).

7. The flaw detection device for bridge construction according to claim 6 is characterized in that: The baffle (13) on one side of the rectangular tube (15) has an arc surface below; a round rod is rotatably connected below the arc surface; and a shielding layer (64) is fixedly connected to the outer ring surface of the round rod.

8. The flaw detection device for bridge construction according to claim 7 is characterized in that: A storage bottle (7) is installed on one side of the slide groove (14); the storage bottle (7) contains watercolor paint; A conduit (71) is fixedly mounted on the rectangular cylinder (15), and a control valve is mounted on the conduit (71); the conduit (71) is connected to the storage bottle (7) via a connecting pipe (72).

9. The flaw detection device for bridge construction according to claim 8, characterized in that: The connecting pipe (72) is a telescopic pipe.

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