Flaw detection equipment for bridge construction

Abstract

The invention relates to the technical field of bridge flaw detection equipment, in particular to flaw detection equipment for bridge construction, which comprises an equipment shell, an adapter box is fixedly mounted at the front end of the equipment shell, two tensioning wheels are rotatably mounted at each of the front end and the rear end of the equipment shell, and the outer surfaces of the tensioning wheels are tensioned and sleeved through a crawler belt; a plurality of magnetic blocks are arranged in the front end and the rear end of the equipment shell and can magnetize a steel structure below the equipment shell, a supporting frame is fixedly installed at the inner end of the equipment shell through bolts, a plurality of matching plates are arranged at the inner end of the supporting frame, spraying devices are arranged in the matching plates, and an angle adjusting device is arranged in the adaptation box. The angle of the nozzle can be flexibly adjusted according to the radian of a bent steel member or a cylindrical steel structure, it is ensured that magnetic powder uniformly covers the whole surface, the detection blind area caused by angle mismatching is avoided, the problem of non-uniform distribution of the magnetic powder is avoided, the visual effect of defect detection is improved, and defects are displayed more clearly.

Description

Technical Field

[0001] The invention relates to the technical field of bridge flaw detection equipment, in particular to a flaw detection equipment for bridge construction. Background Art

[0002] During the bridge construction process, the quality of concrete and steel structures is directly related to the safety and service life of the bridge. Since the bridge will be affected by factors such as vehicle loads, wind loads, temperature changes and environmental corrosion during long-term use, its internal materials may have cracks, pores, inclusions, welding defects and other damages. If these defects are not discovered and repaired in time, the bearing capacity of the bridge structure may be reduced, and even safety accidents may occur. Therefore, it is of great significance to perform nondestructive testing on materials and welding parts during the bridge construction process.

[0003] After searching, it was found that the prior art publication number was CN216462601U, which disclosed a non-destructive flaw detection device for large steel frame welding, including a flaw detection device box, a moving structure was installed at the front and rear ends of the lower side of the flaw detection device box, a flaw detection arm was installed on one side of the flaw detection device box, a transmission motor, a battery and a single-chip microcomputer were installed inside the flaw detection device box, an electromagnet was installed on the lower side of the flaw detection device box, a second gear was installed on the outer end of the transmission motor, the moving structure included a shaft rod, a shaft rod seat was installed on the outer surface of the shaft rod, and fixing wheels were installed at both ends of the shaft rod. This scheme is provided with a transmission structure, a wheel width adjustment structure, and an electromagnet adsorption structure. After matching and fixing with the steel beam, the weld flaw detection on a certain distance of the steel beam can be completed, and it can adapt to the flaw detection on steel beams of different widths.

[0004] Therefore, based on the above search and combined with existing technologies, when inspecting curved steel beams and cylindrical steel structures, existing solutions often have uneven coverage of the inspection area, resulting in some defects being difficult to show, affecting the inspection accuracy. In addition, due to the complex shape of steel components, it is often necessary to manually adjust the spray direction frequently, which increases the difficulty of operation. Traditional magnetic particle inspection equipment is mainly suitable for horizontal or downward inspection. For the top steel beams of bridges, suspended steel structures and complex welding nodes, manual high-altitude operations or scaffolding are usually required, increasing the safety risk of construction. At the same time, due to the influence of gravity, the magnetic powder is unevenly distributed on the top steel structure, making it difficult to ensure the quality of inspection, and the magnetic powder is easy to float, which not only wastes materials, but may also be accidentally inhaled by operators, endangering their health. For this reason, we propose a flaw detection equipment for bridge construction. Summary of the invention

[0005] The object of the present invention is to provide a flaw detection device for bridge construction to solve the problems raised in the above-mentioned background technology.

[0006] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a flaw detection equipment for bridge construction, comprising an equipment shell, an adapter box is fixedly installed at the front end of the equipment shell, two tensioning wheels are rotatably installed at the front and rear ends of the equipment shell, the outer surface of the tensioning wheel is set by a track tensioning sleeve, and a plurality of magnetic blocks are arranged inside the front and rear ends of the equipment shell, and the magnetic blocks can magnetize the steel structure under the equipment shell, and a support frame is fixedly installed at the inner end of the equipment shell by bolts, and a plurality of matching plates are arranged at the inner end of the support frame, and the plurality of matching plates are rotatably connected to each other, and a spraying device for spraying magnetic powder is arranged inside the matching plate, and the sprayed magnetic powder adheres to the outer surface of the magnetic steel structure, and an angle adjustment device capable of adjusting the rotation arc of the matching plate is arranged inside the adapter box. The rotation angle is changed according to actual conditions to realize the spraying of magnetic powder on the outer surface of steel structures with different arcs, and the magnetic powder will be concentrated at the defective position, so that the defect becomes visible.

[0007] As a further solution of the present invention, the angle adjustment device includes a grid, a plurality of height measuring bars are slidably installed on the inner end of the grid, the height measuring bars are slidably connected to the inner end of the adapter box, a plurality of air pumps are fixedly installed on the inner end of the adapter box, the extending ends of the air pumps are fixedly connected to the height measuring bars, and a locking rod is passed through the inner end of the adapter box.

[0008] As a further solution of the present invention, the locking rod is located on the right side of the grid, and a plurality of locking blocks are fixedly installed on the outer surface of the locking rod, a plurality of locking holes are opened at the right end of the height measuring strip, and when the locking rod rotates, the locking blocks are driven to pass through the lock holes, and a plurality of airbags are fixedly installed on the right end of the support frame, and the airbags are located below a plurality of matching plates, and the airbags are connected to the air pump through an air duct.

[0009] As a further solution of the present invention, the spraying device includes a material receiving pipe, which is fixedly connected to the upper end of the matching plate by bolts, the inner end of the material receiving pipe is slidably connected to a material conveying ring, the outer surface of the material receiving pipe is fixedly connected to an output pipe, and the inner end of the output pipe is penetrated by a matching pipe.

[0010] As a further solution of the present invention, the matching tube is connected to the output tube by an unlocking spring, and a limiting ring is fixedly installed on the bottom end of the matching tube. The limiting ring is located below the output tube, further preventing the matching tube from detaching from the output tube. Through the physical limitation of the limiting ring, the matching tube can still be firmly connected to the output tube even under long-term operation or external force, preventing it from falling off due to vibration or pressure changes, thereby ensuring the continuous and stable operation of the flaw detection equipment.

[0011] As a further solution of the present invention, the upper end of the mating tube is slidably connected with a locking cover, the front and rear ends of the left side of the locking cover are fixedly connected with passive rods, the front and rear ends of the output tube are slidably installed with triangular plates, the triangular plates are fixedly connected to the feed ring, and the bottom end of the passive rod is slidably connected to the slope surface of the triangular plate.

[0012] As a further solution of the present invention, a center rod is passed through the inner end of the matching tube, and a push plate is fixedly connected to the bottom end of the center rod. The push plate and the matching tube are connected by an extrusion spring, and a conical head is fixedly connected to the upper end of the center rod, and a plurality of spring plates are fixedly installed on the inner end of the matching tube.

[0013] As a further solution of the present invention, one end of the spring plate away from the matching tube is clamped under the conical head, and a clamping plate is fixedly installed on the upper end of the spring plate, and a ring is fixedly connected to the inner bottom end of the locking cover, and the ring is sleeved on the outer surfaces of multiple clamping plates to restrict the spring plate and prevent it from being deformed by external force at will, thereby restricting the center rod and preventing further movement of the center rod.

[0014] As a further solution of the present invention, the upper end of the device shell is fixedly connected to a magnetic powder box for filling magnetic powder, the bottom end of the magnetic powder box is fixedly connected to a plurality of docking tubes, the inner end of the magnetic powder box is rotatably mounted with a plurality of spiral rods, and the spiral rods are respectively inserted into the interior of the docking tubes, and the magnetic powder can be evenly and continuously transported to the spraying device through the spiral rod conveying structure to prevent the magnetic powder from agglomerating inside the magnetic powder box.

[0015] As a further solution of the present invention, a jet pipe for spraying out magnetic powder is passed through the inner end of the matching plate, a jet pipe is fixedly connected to the inner end of the jet pipe, an output rod is passed through the inner end of the jet pipe, a turbofan is fixedly installed on the outer surface of the output rod, and a discharging brush for crushing agglomerated magnetic powder is fixedly installed on the upper end of the output rod.

[0016] Compared with the prior art, the present invention has the following beneficial effects: 1. The present invention can flexibly adjust the nozzle angle according to the curvature of the curved steel member or cylindrical steel structure, ensure that the magnetic powder evenly covers the entire surface, avoid the detection blind area caused by angle mismatch, avoid the problem of uneven distribution of magnetic powder, improve the visualization effect of defect detection, and make the defects appear more clearly; 2. The present invention can work in an inverted state, realize flaw detection at the top of the bridge, suspended steel structures, complex welding nodes and other locations, and adapt to more complex construction scenes. The airflow is used to transport magnetic powder, which can overcome the influence of gravity and make the magnetic powder evenly distributed on the surface of the top steel structure, ensuring the magnetic powder adhesion quality in the flaw detection area, and not affecting the detection effect due to the change of the equipment angle. At the same time, the magnetic powder spraying process is inside the equipment shell throughout the process, which can avoid the problem of magnetic powder drifting and causing the operator to accidentally inhale the mouth; 3. The present invention is equipped with a discharge brush, which can prevent the magnetic powder from agglomerating at the nozzle during operation, ensure smooth airflow to transport the magnetic powder, avoid nozzle blockage, and improve the continuous working ability of the equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a structural schematic diagram of a flaw detection device for bridge construction; Figure 2 It is a schematic diagram of the structure inside the device shell; Figure 3 is a structural schematic diagram of an angle adjustment device; Figure 4 This is the disassembly diagram of the track and magnet; Figure 5 It is a schematic diagram of the structure inside the magnetic powder box; Figure 6 It is a schematic diagram of the structure inside the support frame; Figure 7 A structural diagram showing the relationship between the position of the matching plate and the airbag; Figure 8 is a schematic diagram of the structure of the spraying device; Fig. 9 It is a schematic diagram of the internal structure of the material receiving pipe and the output pipe; Fig.10 To match the internal structure of the tube; Fig.11 Schematic diagram of the internal structure of the injection pipe; Fig.12 This is a simplified diagram of the process of hooking up the card to reset the hook.

[0018] In the figure: 1. Equipment shell; 2. Magnetic powder box; 3. Magnetic block; 4. Adapter box; 5. Air pump; 6. Grid; 101. height measuring bar; 102. air guide tube; 103. air pump; 104. locking block; 105. locking rod; 201, crawler track; 202, tension wheel; 203, driven wheel; 204, contact belt; 205, transmission rod; 206, driving disc; 207, reciprocating rod; 301, driving motor; 302, worm; 303, worm wheel; 304, extrusion plate; 305, screw rod; 306, butt joint tube; 401, support frame; 402, matching plate; 403, airbag; 404, guide plate; 501, output pipe; 502, material receiving pipe; 503, partition plate; 504, unlocking spring; 505, locking cover; 506, matching pipe; 507, passive rod; 508, triangular plate; 509, material feeding ring; 510, sleeve ring; 511, blocking spring; 512, clamping plate; 513, spring plate; 514, pushing plate; 515, extruding spring; 516, center rod; 517, reset hook; 601, injection pipe; 602, air pipe; 603, spiral head; 604, discharge brush; 605, injection pipe; 606, output rod. DETAILED DESCRIPTION

[0019] 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.

[0020] Example 1: Please refer to Figure 1 A flaw detection device for bridge construction includes a device shell 1, an adapter box 4 is fixedly installed on the front end of the device shell 1 by bolts, a handle is rotatably installed on the outer surface of the device shell 1, so that the operator can lift it better, and two grips are fixedly welded on the upper end of the device shell 1, so that the operator can further operate the device after holding it; like Figure 2 - Figure 5 As shown, two tensioning wheels 202 are rotatably installed at both the front and rear ends of the equipment shell 1. The outer surface of the tensioning wheel 202 is tensioned by a track 201. The track 201 is made of rubber and has a plurality of anti-skid protrusions on the outer surface to further reduce the slipping phenomenon after contact with the metal outer surface. A plurality of magnetic blocks 3 are arranged inside the front and rear ends of the equipment shell 1. The magnetic blocks 3 can magnetize the steel structure under the equipment shell 1. A support frame 401 is fixedly installed at the inner end of the equipment shell 1 by bolts. A plurality of matching plates 402 are arranged at the inner end of the support frame 401. The matching plates 402 are rotatably connected to each other by a rotating shaft, and a spraying device for spraying magnetic powder is arranged inside the matching plate 402. The sprayed magnetic powder adheres to the outer surface of the magnetic steel structure to realize the inspection of whether there are cracks on the outer surface of the steel structure. like Figure 4Specifically, there are multiple magnetic blocks 3, which are arranged inside the track 201, and two adjacent magnetic blocks 3 are slidably connected to each other, wherein a guide rail is provided at the sliding connection between each magnetic block 3 to prevent the two magnetic blocks 3 close to each other from attracting each other and being unable to move up and down independently. When the track 201 moves on the outer surface of the steel structure, the magnetic blocks 3 are adsorbed on the outer surface of the steel material under the action of magnetic force and isolated by the track 201. The design of multiple magnetic blocks 3 can ensure that when the track 201 passes through a rugged part, the head will not be lifted, so that the magnetic blocks 3 are always adsorbed on the outer surface of the steel structure.

[0021] If it is necessary to inspect the outer surface of a steel structure with a certain curvature, in order to achieve a more uniform spraying of magnetic powder, the adapter box 4 is provided with an angle adjustment device capable of adjusting the rotation curvature of the matching plate 402. The rotation angle of the matching plate 402 is changed according to the actual situation to achieve spraying of magnetic powder on the outer surface of the steel structure with different curvatures, so as to maximize the coverage efficiency of magnetic powder. When there are defects (such as cracks, holes, etc.) on the outer surface of the steel structure, these defects will interfere with the uniform distribution of the magnetic field. The defective position will form a local magnetic leakage, resulting in the deviation of the magnetic line of force and the generation of a local magnetic field. Then the sprayed magnetic powder will be attracted to the area of ​​magnetic field leakage (i.e., the defect) to achieve the detection of the outer surface of the steel.

[0022] See also Figure 3 , Figure 6 , Figure 7 The angle adjustment device includes a grid 6, and a plurality of height measuring bars 101 are slidably installed on the inner end of the grid 6. The height measuring bars 101 are all slidably connected to the inner end of the adapter box 4. A plurality of air pumps 103 are fixedly installed on the inner end of the adapter box 4. The extended end of the air pump 103 is fixedly connected to the height measuring bar 101 by bolts. A locking rod 105 is penetrated at the inner end of the adapter box 4. The locking rod 105 is located on the right side of the grid 6, and a plurality of locking blocks 104 are fixedly welded on the outer surface of the locking rod 105. A plurality of locking holes are opened at the right end of the height measuring bar 101. When the locking rod 105 rotates, the locking block 104 is driven to penetrate the locking hole to fix the current height of the height measuring bar 101. A knob is fixedly connected to the front end of the locking rod 105 to facilitate the operator to rotate the locking rod 105. A plurality of airbags 403 are fixedly mounted on the right end of the support frame 401. The airbags 403 are located below the plurality of matching plates 402 and are fixedly connected thereto by adhesive. A support plate is fixedly mounted on the bottom end of the airbags 403, and the support plate is fixedly connected to the support frame 401, so that the airbags 403 will not extend downward when inflated. The airbags 403 are connected to the air delivery pump 103 by an air guide tube 102. Specifically, fixed shafts are fixedly mounted on the outer surfaces of the matching plates 402 at both ends, and a movable groove is provided at the inner end of the support frame 401. The fixed shaft is inserted into the movable groove, so that the matching plates 402 at both ends can both rotate and reciprocate. More specifically, a portion of air is pre-stored inside the airbag 403. If the height measuring bar 101 moves upward, the gas is transported to the inside of the airbag 403 through the air pipe 102 by the air pump 103, causing the airbag 403 to expand, and then the matching plate 402 is pushed upward. Since the multiple matching plates 402 are rotatably connected to each other, at this time, the connection state between the matching plates 402 presents an arc-like shape. Then, when the height measuring bar 101 moves downward, the gas inside the airbag 403 will be drawn back into the inside of the air pump 103. At this time, the airbag 403 deflates, driving the matching plate 402 to move downward. At this time, the matching plates 402 that are rotatably connected to each other are in an inwardly concave arc shape, so as to achieve detection of the outer surfaces of steel structures with different planes.

[0023] Example 2: Please refer to Figure 2 , Figure 5 A flaw detection device for bridge construction, based on the embodiment 1, a magnetic powder box 2 for filling magnetic powder is fixedly welded on the upper end of the device shell 1, and a sealing cover is provided on the right end of the magnetic powder box 2. By unscrewing the sealing cover, a sufficient amount of magnetic powder is added to the inside of the magnetic powder box 2, so that it can be continuously supplied during the detection process. The bottom end of the magnetic powder box 2 is fixedly connected with a plurality of butt pipes 306, and the inner end of the magnetic powder box 2 is rotatably installed with a plurality of spiral rods 305, and the spiral rods 305 are respectively penetrated Inside the butt joint 306, when the spiral rod 305 rotates, the magnetic powder inside the magnetic powder box 2 is transferred to the inside of the butt joint 306. Specifically, the upper end of the spiral rod 305 is fixedly welded with a rotating rod, and the upper end of the rotating rod is fixedly welded with a worm gear 303. The inner end of the magnetic powder box 2 is rotatably mounted with a worm 302, and the worm 302 is meshed with the worm gear 303. The left end of the magnetic powder box 2 is fixedly connected to the drive motor 301 by bolts, and the output end of the drive motor 301 is fixedly connected to the worm 302. The inner end of the magnetic powder box 2 is slidably connected to the extrusion plate 304, and the rotating rod is inserted into the inside of the extrusion plate 304. The inner right end of the equipment shell 1 is fixedly installed with an air pump 5 by bolts. The inner upper end of the magnetic powder box 2 is fixedly connected to a nozzle, and the nozzle is connected to the output end of the air pump 5 through an air pipe. Then the output end of the air pump 5 outputs high-speed gas, which is then ejected from the nozzle, so as to push the extrusion plate 304 to move and squeeze the magnetic powder inside the magnetic powder box 2, so that when the equipment shell 1 is turned over to detect the outer surface of the steel structure, the continuous supply of magnetic powder can still be achieved.

[0024] like Figure 6 - Fig.10As shown, the spraying device includes a material receiving pipe 502, which is fixedly connected to the upper end of the matching plate 402 by bolts, and the upper end of the material receiving pipe 502 is fixedly connected to the bottom end of the butt pipe 306, and the inner end of the material receiving pipe 502 is slidably connected with a material feeding ring 509, and the outer surface of the material receiving pipe 502 is fixedly connected with an output pipe 501, and the inner end of the output pipe 501 is penetrated by a matching pipe 506, and the matching pipe 506 and the output pipe 501 are connected by an unlocking spring 504, and the bottom end of the matching pipe 506 is fixedly installed with a limit ring, and the limit ring is located below the output pipe 501 to further prevent The matching tube 506 is separated from the output tube 501, and the upper end of the matching tube 506 is slidably connected with the locking cover 505, and the left front and rear ends of the locking cover 505 are fixedly connected with the passive rod 507, and the front and rear ends of the output tube 501 are slidably installed with a triangular plate 508, the triangular plate 508 is fixedly connected with the feeding ring 509, and the bottom end of the passive rod 507 is slidably connected with the slope surface of the triangular plate 508, and the bottom end of the passive rod 507 is fixedly welded with a prismatic block, and the slope surface of the triangular plate 508 is provided with a prismatic groove, and the prismatic block is slidably connected in the prismatic groove, so that the passive rod 507 is not easy to fall off; Then, when the feeding ring 509 moves to the right, the locking cover 505 moves upwards through the sliding connection between the triangular plate 508 and the passive rod 507. Specifically, the locking cover 505 can only move up and down a short distance at the upper end of the matching tube 506. When the triangular plate 508 moves to the rightmost side of the output tube 501, the passive rod 507 is pushed upwards by the slope surface of the triangular plate 508, so that the matching tube 506 moves to the top of the output tube 501. At this time, the feeding ring 509 moves to the right below the matching tube 506. The inner end of the matching tube 506 is penetrated by a center rod 516, and the bottom end of the center rod 516 is fixedly connected to a push plate 514 by bolts. The push plate 514 and the matching tube 506 are connected by a squeezing spring 515. Specifically, the elastic coefficient of the squeezing spring 515 is smaller than the elastic coefficient of the unlocking spring 504. The upper end of the center rod 516 is fixedly welded with a conical head. The inner end of the matching tube 506 is fixedly installed with a plurality of spring plates 513. The elastic potential energy of the spring plates 513 is smaller than that of the squeezing spring 515. 5, and one end of the spring plate 513 away from the matching tube 506 is clamped under the conical head, and the upper end of the spring plate 513 is fixedly installed with a clamping plate 512, and the inner bottom end of the locking cover 505 is fixedly welded with a collar 510, and the collar 510 is sleeved on the outer surface of multiple clamping plates 512 to limit the spring plate 513 and prevent it from being deformed by external force at will, thereby limiting the center rod 516, so as to limit the center rod 516 and prevent the center rod 516 from further moving; like Fig.10 , Fig.12As shown, specifically, a plurality of reset hooks 517 are fixedly mounted on the inner end of the collar 510 , and the reset hooks 517 correspond to the clamping plates 512 , and a clamping groove is provided at one end of the clamping plates 512 close to the center rod 516 .

[0025] like Figure 2 , Figure 5 , Figure 8 As shown, more specifically, multiple passive wheels 203 are rotatably installed on both the front and rear sides of the inner end of the equipment shell 1, and the outer surface of the passive wheel 203 is tensioned by the abutment belt 204. The outer surface of the abutment belt 204 is provided with multiple grooves, and the abutment belt 204 fits the outer surface of the crawler 201. The anti-skid protrusions on the outer surface of the crawler 201 are embedded in the grooves on the outer surface of the abutment belt 204 to maximize the power transmission efficiency. One end of one of the passive wheels 203 close to the support frame 401 is fixedly connected to a transmission rod 205 by bolts, and the transmission rod 205 is away from the passive wheel 2 A driving disk 206 is fixedly welded to one end of 03, and the end of the driving disk 206 away from the center of the circle is rotatably connected to a reciprocating rod 207 via a rotating shaft. Two adjacent triangular plates 508 are fixedly connected via a guide plate 404. The guide plate 404 is made of a bendable metal material and can bend according to the rotation angle of the matching plate 402. The reciprocating rod 207 and the guide plate 404 are connected via a universal joint. When the passive wheel 203 rotates, the driving disk 206 is driven to rotate via the transmission rod 205, thereby achieving reciprocating movement of the guide plate 404 via the reciprocating rod 207.

[0026] See also Figure 8 , Fig.11 The inner end of the matching plate 402 is provided with a jet pipe 601 for spraying magnetic powder. When the matching plate 402 rotates, the jet pipe 601 can change the spray angle accordingly. The inner end of the jet pipe 601 is fixedly connected with a jet pipe 605. The outer surface of the jet pipe 605 is fixedly connected with a gas pipe 602. The input end of the gas pipe 602 is fixedly connected to the output end of the gas pump 5. The inner end of the jet pipe 605 is provided with an output rod 606. The outer surface of the output rod 606 is fixedly installed with a turbofan, and the upper end of the output rod 606 is fixedly installed with a discharge brush 604 for crushing the agglomerated magnetic powder. The discharge brush 604 is located above the jet pipe 605. The upper end of the output rod 606 is fixedly installed with a spiral head 603. When the agglomerated magnetic powder passes through the spiral head 603, the rotating spiral head 603 can quickly crush it. like Fig. 9 - Fig.11As shown, specifically, a notch of the same size as the spiral head 603 is provided at the right end of the feed ring 509, so that the feed ring 509 can move to the top of the injection pipe 601 without any resistance, and a rectangular notch is provided at the upper right corner of the feed ring 509. After the push plate 514 moves downward, the maximum distance of the feed ring 509 moving downward will not exceed the height of the notch, so as to avoid the push plate 514 being hit by the feed ring 509 and causing damage to the device. More specifically, a partition plate 503 is fixedly welded to the left end of the feed ring 509. After the feed ring 509 moves to the right, the partition plate 503 can block the receiving pipe 502, so as to prevent the magnetic powder inside the receiving pipe 502 from coming to the left side of the feed ring 509, causing the feed ring 509 to be unable to reset normally. The length of the partition plate 503 is greater than the length of the output pipe 501.

[0027] The working principle of the present invention is: When in use, push the height measuring bar 101 to reach a suitable height, and rotate the locking rod 105 by turning the knob to fix the height measuring bar 101. At this time, the multiple matching plates 402 expand and contract through the airbag 403 to form a suitable arc. Then, place the device on the outer surface of the steel structure. The magnetic block 3 attaches the track 201 tightly to the outer surface of the steel structure under the action of attraction, and pushes the device shell 1 to move through the handle. The air pump 5 starts and enters the interior of the jet pipe 605 through the air delivery pipe 602. As the air is ejected, the turbofan on the outer surface of the jet pipe 605 rotates rapidly, and drives the unloading brush 604 and the spiral head 603 to rotate; When the equipment shell 1 moves, it drives the contact belt 204 to rotate through the crawler 201, and then the contact belt 204 drives the passive wheel 203 to rotate. Then, when the passive wheel 203 rotates, the driving plate 206 is driven to rotate through the transmission rod 205, and then the guide plate 404 is driven to reciprocate through the reciprocating rod 207. Before that, as the spiral rod 305 inside the magnetic powder box 2 rotates, the magnetic powder is transported to the inside of the feeding ring 509. After the magnetic powder is squeezed, the gap between the magnetic powders becomes smaller and some agglomerates appear. At this time, when the guide plate 404 moves, it drives the triangular plate 508 to move, and the movement of the triangular plate 508 drives the feeding ring 509 to move. At this time, the feeding ring 509 transports the internal magnetic powder to the top of the injection pipe 601; Then, when the triangular plate 508 moves, the passive rod 507 is pushed upward by the slope surface, and the locking cover 505 starts to move upward, and the matching tube 506 is pushed upward by the elastic force of the unlocking spring 504. At this time, the upward movement speed of the matching tube 506 is consistent with the upward movement speed of the locking cover 505. When the limit ring at the bottom end of the matching tube 506 contacts the inner end of the output tube 501, the movement process of the matching tube 506 ends here, but the locking cover 505 will still move upward, and drive the collar 510 to move upward, so that it is separated from the sleeve of the clamping plate 512; At the same time, the feeding ring 509 is parallel to the matching tube 506 and the injection tube 601. At this time, the elastic force of the extrusion spring 515 begins to release, and pushes the push plate 514 to move downward, pushing the magnetic powder inside the feeding ring 509 to the top of the discharge brush 604. Then, the agglomerated magnetic powder will be brushed off by the discharge brush 604, and then under the action of the airflow, the magnetic powder will quickly adhere to the outer surface of the steel structure. Even if the equipment shell 1 is in the process of inverted inspection of the steel structure, the magnetic powder can still adhere to the outer surface of the steel structure, making it more convenient in the flaw detection process; Then, when the feed ring 509 is reset, the triangular plate 508 moves to the left and presses the locking cover 505 downward through the passive rod 507. At this time, as the locking cover 505 moves downward, the spring plate 513 is pressed downward by the blocking spring 511 (at this time, the spring plate 513 and the clamping plate 512 are in an inclined state), the spring plate 513 deviates downward away from the end of the matching tube 506, and when the locking cover 505 moves downward, it pushes the matching tube 506 to move downward (at this time, the collar 510 is located above the clamping plate 512, but is not sleeved on the outer surface of the clamping plate 512). At this time, the spring plate 513 gradually approaches the conical head above the center rod 516, and then the clamping plate 512 passes over the conical head. At this time, the clamping plate 512 is still in an inclined state (such as Fig.12 As shown), at this time, the reset hook 517 has been engaged in the card slot on the outer surface of the card plate 512; Then, the process waits for the next upward movement of the ring 510, so that it pulls the clamping plate 512 to a vertical state through the reset hook 517, and then the clamping plate 512 is separated from the reset hook 517, and then the ring 510 is re-set on the outer surface of the clamping plate 512 and the conical head above the center rod 516 is clamped again, and then the above steps are repeated to realize the process of continuous defect detection on the outer surface of the steel structure.

[0028] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed in the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A flaw detection device for bridge construction, comprising a device housing (1), characterized in that: An adapter box (4) is fixedly installed at the front end of the device shell (1); two tension wheels (202) are rotatably installed at both the front and rear ends of the device shell (1); the outer surfaces of the tension wheels (202) are tensioned by tracks (201); a plurality of magnetic blocks (3) are arranged inside both the front and rear ends of the device shell (1); the magnetic blocks (3) are capable of magnetizing the steel structure below the device shell (1); a support frame (401) is fixedly installed at the inner end of the device shell (1) by bolts; the inner end of the support frame (401) is provided with There are a plurality of matching plates (402), the plurality of matching plates (402) are rotatably connected to each other, and a spraying device for spraying magnetic powder is arranged inside the matching plates (402), and the sprayed magnetic powder adheres to the outer surface of the magnetic steel structure. The adapter box (4) is arranged inside with an angle adjustment device capable of adjusting the rotational arc of the matching plates (402). The rotational angle of (402) is changed according to actual conditions to spray magnetic powder on the outer surface of the steel structure with different arcs. The magnetic powder will be concentrated at the defective position, thereby making the defect visible.

2. A flaw detection device for bridge construction according to claim 1, characterized in that: The angle adjustment device comprises a grid (6), a plurality of height measuring bars (101) are slidably mounted on the inner end of the grid (6), the height measuring bars (101) are all slidably connected to the inner end of the adapter box (4), a plurality of air pumps (103) are fixedly mounted on the inner end of the adapter box (4), the extended ends of the air pumps (103) are fixedly connected to the height measuring bars (101), and a locking rod (105) is passed through the inner end of the adapter box (4).

3. A flaw detection device for bridge construction according to claim 2, characterized in that: The locking rod (105) is located on the right side of the grid (6), and a plurality of locking blocks (104) are fixedly mounted on the outer surface of the locking rod (105). A plurality of locking holes are opened at the right end of the height measuring strip (101). When the locking rod (105) rotates, the locking blocks (104) are driven to pass through the locking holes. A plurality of air bags (403) are fixedly mounted on the right end of the support frame (401). The air bags (403) are located below the plurality of matching plates (402). The air bags (403) are connected to the air pump (103) via an air guide tube (102).

4. A flaw detection device for bridge construction according to claim 1, characterized in that: The spraying device comprises a material receiving pipe (502), the material receiving pipe (502) being fixedly connected to the upper end of the matching plate (402) by means of bolts, the inner end of the material receiving pipe (502) being slidably connected to a material conveying ring (509), the outer surface of the material receiving pipe (502) being fixedly connected to an output pipe (501), and the inner end of the output pipe (501) being penetrated by a matching pipe (506).

5. A flaw detection device for bridge construction according to claim 4, characterized in that: The matching tube (506) is connected to the output tube (501) via an unlocking spring (504); a limit ring is fixedly mounted on the bottom end of the matching tube (506); the limit ring is located below the output tube (501) to further prevent the matching tube (506) from escaping from the output tube (501).

6. A flaw detection device for bridge construction according to claim 5, characterized in that: The upper end of the matching tube (506) is slidably connected to a locking cover (505), and the left front and rear ends of the locking cover (505) are fixedly connected to passive rods (507), and the front and rear ends of the output tube (501) are slidably mounted with triangular plates (508), the triangular plates (508) are fixedly connected to the feed ring (509), and the bottom end of the passive rod (507) is slidably connected to the slope surface of the triangular plate (508).

7. A flaw detection device for bridge construction according to claim 6, characterized in that: A center rod (516) is passed through the inner end of the matching tube (506); a push plate (514) is fixedly connected to the bottom end of the center rod (516); the push plate (514) and the matching tube (506) are connected via a material extrusion spring (515); a conical head is fixedly connected to the upper end of the center rod (516); and a plurality of spring plates (513) are fixedly installed on the inner end of the matching tube (506).

8. A flaw detection device for bridge construction according to claim 7, characterized in that: One end of the spring plate (513) away from the matching tube (506) is clamped under the conical head, and a clamping plate (512) is fixedly installed on the upper end of the spring plate (513). The inner bottom end of the locking cover (505) is fixedly connected with a ring (510), and the ring (510) is sleeved on the outer surface of multiple clamping plates (512) to restrict the spring plate (513) and prevent it from being deformed by external force at will, thereby restricting the center rod (516) and preventing the center rod (516) from further moving.

9. The flaw detection equipment for bridge construction according to claim 1, characterized in that: A magnetic powder box (2) for loading magnetic powder is fixedly connected to the upper end of the device shell (1), a plurality of butt joint tubes (306) are fixedly connected to the bottom end of the magnetic powder box (2), a plurality of spiral rods (305) are rotatably mounted on the inner end of the magnetic powder box (2), and the spiral rods (305) are respectively inserted into the interior of the butt joint tubes (306).

10. The flaw detection equipment for bridge construction according to claim 1, characterized in that: A jet pipe (601) for ejecting magnetic powder is passed through the inner end of the matching plate (402), a jet pipe (605) is fixedly connected to the inner end of the jet pipe (601), an output rod (606) is passed through the inner end of the jet pipe (605), a turbofan is fixedly mounted on the outer surface of the output rod (606), and a discharge brush (604) for crushing agglomerated magnetic powder is fixedly mounted on the upper end of the output rod (606).

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