A flaw detection device for bridge construction

Abstract

The present invention belongs to the technical field of flaw detection, and specifically relates to a flaw detection device for bridge construction, including an ultrasonic flaw detector; the ultrasonic flaw detector includes a flaw detector body; a probe is installed on the flaw detector through a connecting wire, and the probe is located inside a rectangular cylinder, and the bottom surface of the probe contacts the weld surface; two guide rods are installed on 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; a protection mechanism is further included; by setting the protection mechanism, foreign impurities can be blocked to avoid affecting the detection result due to the presence of impurities.

Description

Technical Field

[0001] The present invention belongs to the technical field of flaw detection, and specifically relates to a flaw detection device for 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. Due to the long-term exposure of bridges to complex actions such as vehicle loads and natural environmental erosion, once there are defects in the welds, it is very likely to cause serious safety accidents during service. Therefore, it is extremely necessary to conduct flaw detection on the welds during bridge construction;

[0003] For the flaw detection of bridge fillet welds, methods such as ultrasonic flaw detection or X-ray flaw detection are usually used. These methods can effectively detect defects in the welds, such as pores, slag inclusions, lack of fusion, etc. When selecting a flaw detection method, the specific situation of the weld and the detection requirements need to be considered to ensure the accuracy and reliability of the detection results.

[0004] Preparations before detection include cleaning the surface of the weld, removing impurities such as welding slag, oil stains, rust, etc., to ensure that the detection area is clean and flat. Use sandpaper or a grinding machine to process the surface of the weld to expose the metallic luster and improve the detection accuracy. Both sides of the weld should be processed within a range extending 25 mm each to avoid interference of impurities with the detection signal;

[0005] When using ultrasonic flaw detection to detect the welds of a bridge, first, a coupling agent needs to be evenly applied to the position after cleaning the weld. Then, the worker holds the probe, squats down to the weld position, and moves the probe back and forth longitudinally along the weld for flaw detection. Subsequently, the worker moves horizontally along the weld and gradually moves the probe back and forth longitudinally for flaw detection at different positions of the weld;

[0006] During the process of manual flaw detection of welds, if external impurities are pushed into the coupling agent when the worker moves or are affected by external wind forces, it will affect the probe detection process. The presence of impurities will cause additional reflections and scattering, generating some irregular signals, which will interfere with the judgment of the detection personnel and increase the possibility of misjudgment. Summary of the Invention

[0007] In order to make up for the deficiencies of the prior art and solve the above technical problems, the present invention proposes a flaw detection device for bridge construction, which can block external impurities through the setting of a protection mechanism to avoid affecting the detection results due to the presence of impurities; the specific structure is as follows;

[0008] A flaw detection device for bridge construction includes an ultrasonic flaw detector; the ultrasonic flaw detector includes a flaw detector body;

[0009] The flaw detector is provided with a probe through a connecting line, and the probe is located inside the rectangular tube, and the bottom surface of the probe contacts the weld surface;

[0010] Two guide rods are installed on the top of the probe, and the guide rods are located on both sides of the connecting line; guide cylinders are 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 limit rings are fixedly connected to the outer ring surfaces of the two guide cylinders.

[0011] Preferably, it further comprises a protection mechanism; the protection mechanism comprises a shielding bin, and the shielding bin has a cross-section of a 冂 shape; the shielding bin is made entirely of a transparent acrylic plate material;

[0012] The side plates on both sides of the shielding bin are located inside the shielding bin and are each provided with two rotating wheels; the 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 shielding bin; the rotating wheel portion extends to a position below the shielding bin;

[0013] Baffles are provided at the openings on both sides of the shielding bin; a slide groove is provided on the top of the shielding bin; a rectangular cylinder is slidably connected in the slide groove, and there is a certain distance between the rectangular cylinder and the lowest end of the rotating wheel;

[0014] 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 inside the C-shaped plate, and the brush roller is used to apply coupling agent to the bridge weld; a flow channel is fixedly connected above the C-shaped plate, and the flow channel extends to the top of the shielding bin;

[0015] A liquid tank is installed above the flow channel and at the top of the shielding bin, and the liquid tank is connected to the flow channel, and the liquid tank contains coupling agent;

[0016] The baffle position on the right side is provided with a re-cleaning component, and the re-cleaning component is used to clean the weld again.

[0017] Preferably, the re-cleaning assembly comprises two rotating rods;

[0018] The two rotating rods are both inclined rods; the two rotating rods are staggered on opposite sides; the opposite sides of the two rotating rods extend to the positions on both sides of the baffle;

[0019] The side walls on both sides of the shielding bin are fixedly connected with mounting plates, and the mounting plates are V-shaped plates; the two rotating rods are respectively rotated on the two mounting plates;

[0020] A first motor is installed on each of the two mounting plates, and the first motor is used to drive the rotating rod to rotate; and a first cleaning brush is arranged on each of the two rotating rods.

[0021] Preferably, the first cleaning brush is spiral-shaped.

[0022] Preferably, a first gear is fixedly connected to the connecting rod near the rotating rod.

[0023] A second motor is installed on the baffle near the rotating rod; a second gear meshing with the first gear is installed on the output shaft of the second motor.

[0024] A reciprocating lead screw is rotatably connected to the top of the shielding bin on the right side of the chute; the reciprocating lead screw is driven by a third motor.

[0025] A nut slider is in screw drive on the reciprocating lead screw, and the nut slider slides back and forth along the reciprocating lead screw; two convex slideways are formed at the top of the nut slider; convex sliders slide in the convex slideways; a limiting plate is fixedly connected to the two convex sliders.

[0026] Preferably, worm gears are fixedly connected to both ends of the two connecting rods, and the worm gears extend to the outside of the shielding bin.

[0027] Below the four worm gears are worm wheels, and the worm wheels mesh with the worm gears; the two worm wheels on the same side correspond to each other and are connected by a long rod.

[0028] Side plates are arranged on both sides of the long rod, and the side plates are fixedly connected to the shielding bin, and the long rods rotate on the side plates on both sides; second cleaning brushes are fixedly connected to the long rods.

[0029] Preferably, the baffle below the left side of the rectangular cylinder is an arc surface; a round rod is rotatably connected below the arc surface; a uniformly arranged shielding layer is fixedly connected to the outer circumferential surface of the round rod.

[0030] Preferably, a storage bottle is installed on the left side of the chute; the storage bottle contains watercolor pigments.

[0031] A conduit is fixedly installed on the rectangular cylinder, and a control valve is installed on the conduit; the conduit is communicated with the storage bottle through a connecting pipe.

[0032] Preferably, the connecting pipe is a telescopic pipe.

[0033] The beneficial effects of the present invention are as follows:

[0034] 1. For a flaw detection device for bridge construction according to the present invention, since the weld is located inside the shielding bin, during the process of detecting the weld, the shielding bin can block external impurities, thus avoiding manual pushing of impurities or the movement of impurities caused by wind, so that the impurities move into the coupling agent, which will affect the detection process of the probe. The presence of impurities will cause additional reflections and scatterings, generating some irregular signals, which will interfere with the judgment of the detection personnel and increase the possibility of misjudgment.

[0035] 2. In the process of detecting the weld by the flaw detection device for bridge construction according to the present invention, when controlling the first motor to rotate, 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 mutually staggered first cleaning brushes can clean the undetected welds in the moving direction of the shielding bin again, thereby avoiding impurities on the welds. When applying the coupling agent, the impurities will be coated in the coupling agent, thus affecting the process of detecting the welds. At the same time, since the first cleaning brush is spiral, during the rotation of the spiral first cleaning brush, the impurities on the weld will be pushed to both sides of the shielding bin, thereby avoiding the accumulation of impurities in front of the first cleaning brush.

[0036] 3. In the process of the second cleaning brush rotating according to the flaw detection device for bridge construction of the present invention, it rotates along both sides of the bottom weld. During this process, the second cleaning brush can not only block the side of the shielding bin, thereby avoiding impurities from entering the inside of the shielding bin through the gaps at the bottom of the shielding bin, but also the rotating second cleaning brush can push away the impurities moving towards the shielding bin, avoiding impurities at the position close to the outside of the shielding bin from interfering with the detection signal. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] The present invention will be further described below with reference to the drawings.

[0038] Figure 1 is a schematic diagram of the ultrasonic flaw detector of the present invention during detection;

[0039] Figure 2 is a structural diagram of the ultrasonic flaw detector and the protection mechanism of the present invention;

[0040] Figure 3 is the present invention Figure 2 partial enlarged view at A in;

[0041] Figure 4 is a structural diagram of the protection mechanism of the present invention;

[0042] Figure 5 is the present invention Figure 4 partial enlarged view at B in;

[0043] Figure 6 is a structural diagram of the ultrasonic flaw detector of the present invention;

[0044] Figure 7 is a top view of the protection mechanism of the present invention;

[0045] Figure 8 is the present invention Figure 7 cross-sectional view taken along C-C in;

[0046] Figure 9 is the present invention Figure 8 partial enlarged view at D in;

[0047] Figure 10 is a cross-sectional view taken along line E-E of the present invention Figure 7 in the present invention;

[0048] Figure 11 is a partial enlarged view at position F of the present invention Figure 10 in the present invention.

[0049] In the figure: 1, shielding bin; 11, runner; 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, limiting 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, conduit; 72, connecting pipe. Specific embodiments

[0050] 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 embodiments. It should be noted that the embodiments shown below of the present invention are based on the perspective of the attached Figure 1-11 figure for display and explanation, and also include the specific configuration of the parts in the embodiments of the flaw detection device for bridge construction in the present invention, the specific connection relationship and positional relationship of the parts, etc., such as the specific quantity of the parts, the specific positional relationship under the perspective of the attached figure, etc. The purpose is to facilitate those skilled in the art to clearly and completely understand the present invention in combination with the attached figure and the following embodiments, and to facilitate the implementation of the present invention, as follows:

[0051] Embodiment 1: As Figures 1 to 11 shown, a flaw detection device for bridge construction according to the present invention includes an ultrasonic flaw detector; the ultrasonic flaw detector includes a flaw detector body 2;

[0052] 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;

[0053] 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;

[0054] It also 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 shape; the whole of the shielding bin 1 is made of transparent acrylic plate material;

[0055] On both side plates of the shielding bin 1, two rotating wheels 11 are provided on the inner side 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 side plates on both sides of the shielding bin 1; a part of the rotating wheel 11 extends to the position below the shielding bin 1;

[0056] At both openings of the shielding bin 1, baffle plates 13 are provided; a chute 14 is opened at the top of the shielding bin 1; a rectangular cylinder 15 is slidably connected in the chute 14, and there is a certain distance between the rectangular cylinder 15 and the lowest end of the rotating wheel 11;

[0057] On the right side of the rectangular cylinder 15, a C-shaped plate 16 is provided, and the opening of the C-shaped plate 16 faces downward; a brush roller 17 is rotatably connected in the C-shaped plate 16, and the brush roller 17 is used for applying a 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 above the shielding bin 1;

[0058] Above the flow channel 18, a liquid bin 19 is installed on the top of the shielding bin 1, and the liquid bin 19 is communicated with the flow channel 18, and the liquid bin 19 is filled with a coupling agent;

[0059] At the position of the baffle plate 13 on the right side, a re-cleaning component is provided, and the re-cleaning component is used for cleaning the weld again;

[0060] Specifically, before flaw detection of the weld after bridge construction, it is necessary to clean the surface of the weld, remove impurities such as welding slag, oil stain, rust on the weld, and ensure that the detection area is clean and flat; and use sandpaper or a grinding machine to process the surface of the weld to expose the metallic luster, so as to improve the detection accuracy. When the surface of the weld is cleaned, first place the shielding bin 1 above the weld, and then first push the shielding bin 1 to move horizontally along the weld for a distance. 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 surface of the weld and rotate along the weld. During the rotation of the brush roller 17, the coupling agent in the flow channel 18 can be taken out and the coupling agent is applied to the surface of the weld through the brush roller 17, and then stop controlling the movement of the shielding bin 1;

[0061] More specifically, the probe 21 is then inserted into the rectangular cylinder 15. The probe 21 will gradually slide downward within the rectangular cylinder 15 and gradually fit with the applied coupling agent. When the probe 21 fits with the weld surface, the flaw detector body 2 is started at this time. Subsequently, the operator can push the guide rod 22 to move back and forth within the sliding groove 14. At the same time, the probe 21 will move back and forth following the guide rod 22 and drive the rectangular cylinder 15 to move back and forth within the sliding groove 14. During the process of the probe 21 moving back and forth, the probe 21 can be made to detect longitudinally along the weld. After this part of the weld is detected, continue to push the entire shielding bin 1 to move transversely along the weld. When the shielding bin 1 moves, it will drive the brush roller 17 to continue applying the coupling agent to the weld surface, and then continue to detect the undetected weld until all positions on the weld are detected;

[0062] Furthermore, since the weld is located inside the shielding bin 1, during the process of detecting the weld, the shielding bin 1 can block external impurities, thereby avoiding the situation where impurities are pushed by the operator or blown by the wind to move, causing the impurities to move into the coupling agent, which will affect the detection process of the probe 21. The presence of impurities will cause additional reflections and scatterings, generating some irregular signals, which will interfere with the judgment of the detector and increase the possibility of misjudgment.

[0063] Embodiment 2: The re-cleaning assembly includes two rotating rods 3; both of the two rotating rods 3 are inclined rods; the opposite sides of the two rotating rods 3 are arranged staggeredly; both of the opposite sides of the two rotating rods 3 extend to positions on both sides of the baffle 13;

[0064] Both side walls of the shielding bin 1 are fixedly connected with mounting plates 31, and the mounting plates 31 are V-shaped plates; the two rotating rods 3 are respectively rotatably mounted on the two mounting plates 31;

[0065] Both of the two mounting plates 31 are provided with first motors 32, and the first motors 32 are used to drive the rotating rods 3 to rotate; the two rotating rods 3 are provided with first cleaning brushes 33;

[0066] In this embodiment, the first cleaning brush 33 is spiral-shaped; a first gear 4 is fixedly connected to the connecting rod 12 close to the rotating rod 3;

[0067] 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;

[0068] A reciprocating lead screw 5 is rotatably connected to the top of the shielding bin 1 on the right side of the sliding groove 14; the reciprocating lead screw 5 is driven by a third motor 51;

[0069] A nut slider 52 is helically driven on the reciprocating lead screw 5, and the nut slider 52 slides back and forth along the reciprocating lead screw 5; two convex slides 53 are provided at the top of the nut slider 52; a convex slider 54 slides in the convex slide 53; a limiting plate 55 is fixedly connected to the two convex sliders 54;

[0070] Specifically, when detecting the weld seam, the protective mechanism can be selected to automatically detect the weld seam. The specific operation is as follows. First, control 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 runners 11 to rotate through the connecting rod 12. The rotating runners 11 will drive the whole shielding bin 1 to move along the weld seam and gradually apply the coupling agent to the weld seam. When the weld seam below the chute 14 is coated with the coupling agent, control the runner 11 to stop rotating, and place the probe 21 into the rectangular cylinder 15, and make the probe 21 fit with the weld seam coated with the coupling agent. Then, push the limiting plate 55 towards the position of the guide cylinder 23. The limiting plate 55 will drive the convex slider 54 to move in the convex slide 53, and at the same time press down the guide cylinder 23, so that the guide cylinder 23 moves down along the guide rod 22 and compresses the spring. When the two limiting rings 24 on the guide cylinder 23 are aligned with the two limiting plates 55, pass the limiting plate 55 through between the two limiting rings 24 and limit the guide cylinder 23. Then, the weld seam can be automatically detected;

[0071] More specifically, during the detection, control the third motor 51 to rotate. The third motor 51 will drive the reciprocating lead screw 5 to rotate. The reciprocating lead screw 5 will drive the nut slider 52 to move back and forth along the reciprocating lead screw 5, and at the same time drive the limiting plate 55 to move back and forth. The reciprocating limiting plate 55 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 chute 14, so as to move back and forth longitudinally along the weld seam and perform the detection. When the welding detection of this part is completed, control the second motor 41 to drive. The second motor 41 will drive the whole shielding bin 1 to move along the weld seam through the second gear 42, the first gear 4 and the runner 11. When moving to the undetected position, the third motor 51 continues to control the probe 21 to move back and forth, so that different positions of the weld seam can be automatically detected. At the same time, there is no need for manual squatting to detect the weld seam, and it can be avoided that when manually moving, impurities will be pushed into the coupling agent;

[0072] Further, during the process of detecting the weld seam, the first motor 32 is controlled to rotate. The first motor 32 drives the rotating rod 3 to rotate, and the rotating rotating rod 3 drives the first cleaning brush 33 to rotate. Therefore, when the shielding bin 1 moves, the mutually staggered first cleaning brush 33 can clean the undetected weld seam again in the moving direction of the shielding bin 1, thereby avoiding impurities on the weld seam. When applying the coupling agent, the impurities will be coated in the coupling agent, thus affecting the process of detecting the weld seam. At the same time, since the first cleaning brush 33 is spiral, during the rotation of the spiral first cleaning brush 33, the impurities on the weld seam will be pushed to both sides of the shielding bin 1, thereby avoiding the accumulation of impurities in front of the first cleaning brush 33.

[0073] Embodiment 3: Both ends of the two connecting rods 12 are fixedly connected with worm gears 6, and the worm gears 6 extend to the outside of the shielding bin 1;

[0074] Below each of the four worm gears 6, there is a worm wheel 61, and the worm wheel 61 meshes with the worm gear 6; The two worm wheels 61 on the same side correspond to each other and are connected to each other by a long rod 62;

[0075] Both sides of the long rod 62 are provided with side plates, and the side plates are fixedly connected to the shielding bin 1, and the long rod 62 rotates on the side plates on both sides; The long rod 62 is fixedly connected with a second cleaning brush 63;

[0076] In this embodiment, the lower part of the baffle 13 on the left side of the rectangular cylinder 15 is an arc surface; A round rod is rotatably connected below the arc surface; A uniformly arranged shielding layer 64 is fixedly connected to the outer circumferential surface of the round rod;

[0077] Specifically, during the rotation of the connecting rod 12, the worm gears 6 on both sides will be driven to rotate. Since the worm gear 6 meshes with the worm wheel 61, the worm wheel 61 will be 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 will be driven to rotate. During the rotation of the second cleaning brush 63, it will rotate along both sides of the bottom weld seam. During this process, the second cleaning brush 63 can not only block the side of the shielding bin 1, thereby avoiding impurities from entering the inside 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 the impurities moving towards the shielding bin 1, avoiding impurities near the outside of the shielding bin 1 that will interfere with the detection signal;

[0078] More specifically, since the lower part of the baffle 13 on the left side is rotatably connected to the shielding bin 1, and the shielding layer 64 contacts the weld seam surface, when the shielding bin 1 moves, the shielding layer 64 will rotate under the obstruction of the weld seam, and at the same time, the shielding layer 64 in contact with the weld seam surface can be replaced. During this process, impurities behind the shielding bin 1 can be avoided from entering the inside of the shielding bin 1;

[0079] Embodiment 4: A storage bottle 7 is installed on the left side of the chute 14; watercolor pigments are contained in the storage bottle 7; a conduit 71 is fixedly installed on the rectangular cylinder 15, and a control valve is installed on the conduit 71; the conduit 71 is communicated with the storage bottle 7 through a connecting pipe 72; the connecting pipe 72 is a telescopic pipe;

[0080] Specifically, during the reciprocating movement of the rectangular cylinder 15, the conduit 71 will be driven to move back and forth. At the same time, since the connecting pipe 72 is a telescopic pipe, during the reciprocating movement of the conduit 71, the connecting pipe 72 will be continuously stretched. When the position of the probe 21 for detecting the weld seam shows an abnormal situation, the solenoid valve is controlled to open. After the solenoid valve is opened, the watercolor pigments inside the conduit 71 will fall on the left side of the probe 21. The watercolor pigments here can mark the abnormal position of the weld seam. After the overall weld seam is detected, the marked position is re-measured.

[0081] In the description of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the attached drawings. Figure 1 It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus cannot be understood as a limitation on the protection scope of the present invention. In addition, the terms "first", "second", "third", etc. are only used for distinguishing descriptions and cannot be understood as indicating or implying relative importance.

[0082] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited by the above embodiments. What is described in the above embodiments and the specification only illustrates the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention will have various changes and improvements, and these changes and improvements all fall within the scope of the present invention claimed. The scope of protection claimed by the present invention is defined by the appended claims and their equivalents.

Claims

1. A flaw detection device for bridge construction, including an ultrasonic flaw detector; characterized in that: It also 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 shape; On both side plates of the shielding bin (1) located inside the shielding 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 shielding bin (1); a part of the rotating wheel (11) extends to a position below the shielding bin (1); At the openings on both sides of the shielding bin (1), there are baffles (13); on the top of the shielding 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 shielding bin (1); Above the flow channel (18) and on the top of the shielding bin (1), a liquid bin (19) is installed, the liquid bin (19) is communicated with the flow channel (18), and a coupling agent is contained in the liquid bin (19); on one side of the baffle (13), a re-cleaning assembly for re-cleaning the weld seam is arranged; On both ends of the connecting rod (12), there are worms (6) fixedly connected, and the worms (6) extend to the outside of the shielding bin (1); Below the worm (6), there are worm wheels (61), and the worm wheels (61) on the same side correspond to each other and are connected by a long rod (62); On both sides of the long rod (62), there are side plates, the side plates are fixedly connected to the shielding bin (1), and the long rod (62) rotates on the side plates on both sides; on the long rod (62), there is a second cleaning brush (63) fixedly connected; The baffle (13) on one side of the rectangular cylinder (15) is arc-shaped below; a round rod is rotatably connected below the arc surface; a shielding layer (64) is fixedly connected to the outer circumferential surface of the round rod.

2. The flaw detection device for bridge construction according to claim 1, wherein: The ultrasonic flaw detector includes a flaw detector body (2); On the flaw detector body (2), a probe (21) is installed through a connecting wire, the probe (21) is located inside the rectangular cylinder (15), and the bottom surface of the probe (21) contacts the weld surface; On the top of the probe (21), two guide rods (22) are installed, and the guide rods (22) are located on both sides of the connecting wire; a guide cylinder (23) is slidably connected to 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 limit 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, 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 positions on both sides of the baffle (13); On the side walls of both sides of the shielding bin (1), there are mounting plates (31) fixedly connected, 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 provided on the rotating rod (3).

4. The flaw detection device for bridge construction according to claim 3, wherein: The first cleaning brush (33) is spiral.

5. The flaw detection device for bridge construction according to claim 4, 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); A reciprocating lead screw (5) is rotatably connected to one side of the chute (14) at the top of the shielding bin (1); the reciprocating lead screw (5) is driven by a third motor (51); A nut slider (52) is in screw drive on the reciprocating lead screw (5), and the nut slider (52) slides back and forth along the reciprocating lead screw (5); two convex slideways (53) are formed at the top of the nut slider (52); a convex slider (54) slides in the convex slideway (53); a limiting plate (55) is fixedly connected to the convex slider (54).

6. The flaw detection device for bridge construction according to claim 5, characterized in that: A storage bottle (7) is installed on one side of the chute (14); watercolor paint is contained in the storage bottle (7); A conduit (71) is fixedly installed on the rectangular cylinder (15), and a control valve is installed on the conduit (71); the conduit (71) is communicated with the storage bottle (7) through a connecting pipe (72).

7. The flaw detection device for bridge construction according to claim 6, characterized in that: The connecting pipe (72) is a telescopic pipe.

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